Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/file.c |
| 3 | * |
| 4 | * vfs operations that deal with files |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 5 | * |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 8 | * Jeremy Allison (jra@samba.org) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * This library is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Lesser General Public License as published |
| 12 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This library is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 18 | * the GNU Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public License |
| 21 | * along with this library; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | */ |
| 24 | #include <linux/fs.h> |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 25 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/stat.h> |
| 27 | #include <linux/fcntl.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/pagevec.h> |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 30 | #include <linux/writeback.h> |
Andrew Morton | 6f88cc2 | 2006-12-10 02:19:44 -0800 | [diff] [blame] | 31 | #include <linux/task_io_accounting_ops.h> |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 32 | #include <linux/delay.h> |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 33 | #include <linux/mount.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 35 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/div64.h> |
| 37 | #include "cifsfs.h" |
| 38 | #include "cifspdu.h" |
| 39 | #include "cifsglob.h" |
| 40 | #include "cifsproto.h" |
| 41 | #include "cifs_unicode.h" |
| 42 | #include "cifs_debug.h" |
| 43 | #include "cifs_fs_sb.h" |
Suresh Jayaraman | 9451a9a | 2010-07-05 18:12:45 +0530 | [diff] [blame] | 44 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Steve French | 07b92d0 | 2013-02-18 10:34:26 -0600 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | static inline int cifs_convert_flags(unsigned int flags) |
| 48 | { |
| 49 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 50 | return GENERIC_READ; |
| 51 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 52 | return GENERIC_WRITE; |
| 53 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 54 | /* GENERIC_ALL is too much permission to request |
| 55 | can cause unnecessary access denied on create */ |
| 56 | /* return GENERIC_ALL; */ |
| 57 | return (GENERIC_READ | GENERIC_WRITE); |
| 58 | } |
| 59 | |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 60 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
| 61 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | |
| 62 | FILE_READ_DATA); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 63 | } |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 64 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 65 | static u32 cifs_posix_convert_flags(unsigned int flags) |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 66 | { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 67 | u32 posix_flags = 0; |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 68 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 69 | if ((flags & O_ACCMODE) == O_RDONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 70 | posix_flags = SMB_O_RDONLY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 71 | else if ((flags & O_ACCMODE) == O_WRONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 72 | posix_flags = SMB_O_WRONLY; |
| 73 | else if ((flags & O_ACCMODE) == O_RDWR) |
| 74 | posix_flags = SMB_O_RDWR; |
| 75 | |
Steve French | 07b92d0 | 2013-02-18 10:34:26 -0600 | [diff] [blame] | 76 | if (flags & O_CREAT) { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 77 | posix_flags |= SMB_O_CREAT; |
Steve French | 07b92d0 | 2013-02-18 10:34:26 -0600 | [diff] [blame] | 78 | if (flags & O_EXCL) |
| 79 | posix_flags |= SMB_O_EXCL; |
| 80 | } else if (flags & O_EXCL) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 81 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
| 82 | current->comm, current->tgid); |
Steve French | 07b92d0 | 2013-02-18 10:34:26 -0600 | [diff] [blame] | 83 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 84 | if (flags & O_TRUNC) |
| 85 | posix_flags |= SMB_O_TRUNC; |
| 86 | /* be safe and imply O_SYNC for O_DSYNC */ |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 87 | if (flags & O_DSYNC) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 88 | posix_flags |= SMB_O_SYNC; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 89 | if (flags & O_DIRECTORY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 90 | posix_flags |= SMB_O_DIRECTORY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 91 | if (flags & O_NOFOLLOW) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 92 | posix_flags |= SMB_O_NOFOLLOW; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 93 | if (flags & O_DIRECT) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 94 | posix_flags |= SMB_O_DIRECT; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 95 | |
| 96 | return posix_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | static inline int cifs_get_disposition(unsigned int flags) |
| 100 | { |
| 101 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 102 | return FILE_CREATE; |
| 103 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 104 | return FILE_OVERWRITE_IF; |
| 105 | else if ((flags & O_CREAT) == O_CREAT) |
| 106 | return FILE_OPEN_IF; |
Steve French | 55aa2e0 | 2006-05-30 18:09:31 +0000 | [diff] [blame] | 107 | else if ((flags & O_TRUNC) == O_TRUNC) |
| 108 | return FILE_OVERWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | else |
| 110 | return FILE_OPEN; |
| 111 | } |
| 112 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 113 | int cifs_posix_open(char *full_path, struct inode **pinode, |
| 114 | struct super_block *sb, int mode, unsigned int f_flags, |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 115 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 116 | { |
| 117 | int rc; |
| 118 | FILE_UNIX_BASIC_INFO *presp_data; |
| 119 | __u32 posix_flags = 0; |
| 120 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 121 | struct cifs_fattr fattr; |
| 122 | struct tcon_link *tlink; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 123 | struct cifs_tcon *tcon; |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 124 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 125 | cifs_dbg(FYI, "posix open %s\n", full_path); |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 126 | |
| 127 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); |
| 128 | if (presp_data == NULL) |
| 129 | return -ENOMEM; |
| 130 | |
| 131 | tlink = cifs_sb_tlink(cifs_sb); |
| 132 | if (IS_ERR(tlink)) { |
| 133 | rc = PTR_ERR(tlink); |
| 134 | goto posix_open_ret; |
| 135 | } |
| 136 | |
| 137 | tcon = tlink_tcon(tlink); |
| 138 | mode &= ~current_umask(); |
| 139 | |
| 140 | posix_flags = cifs_posix_convert_flags(f_flags); |
| 141 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, |
| 142 | poplock, full_path, cifs_sb->local_nls, |
Nakajima Akira | bc8ebdc4 | 2015-02-13 15:35:58 +0900 | [diff] [blame] | 143 | cifs_remap(cifs_sb)); |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 144 | cifs_put_tlink(tlink); |
| 145 | |
| 146 | if (rc) |
| 147 | goto posix_open_ret; |
| 148 | |
| 149 | if (presp_data->Type == cpu_to_le32(-1)) |
| 150 | goto posix_open_ret; /* open ok, caller does qpathinfo */ |
| 151 | |
| 152 | if (!pinode) |
| 153 | goto posix_open_ret; /* caller does not need info */ |
| 154 | |
| 155 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); |
| 156 | |
| 157 | /* get new inode and set it up */ |
| 158 | if (*pinode == NULL) { |
| 159 | cifs_fill_uniqueid(sb, &fattr); |
| 160 | *pinode = cifs_iget(sb, &fattr); |
| 161 | if (!*pinode) { |
| 162 | rc = -ENOMEM; |
| 163 | goto posix_open_ret; |
| 164 | } |
| 165 | } else { |
| 166 | cifs_fattr_to_inode(*pinode, &fattr); |
| 167 | } |
| 168 | |
| 169 | posix_open_ret: |
| 170 | kfree(presp_data); |
| 171 | return rc; |
| 172 | } |
| 173 | |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 174 | static int |
| 175 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 176 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
| 177 | struct cifs_fid *fid, unsigned int xid) |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 178 | { |
| 179 | int rc; |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 180 | int desired_access; |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 181 | int disposition; |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 182 | int create_options = CREATE_NOT_DIR; |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 183 | FILE_ALL_INFO *buf; |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 184 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 185 | struct cifs_open_parms oparms; |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 186 | |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 187 | if (!server->ops->open) |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 188 | return -ENOSYS; |
| 189 | |
| 190 | desired_access = cifs_convert_flags(f_flags); |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 191 | |
| 192 | /********************************************************************* |
| 193 | * open flag mapping table: |
| 194 | * |
| 195 | * POSIX Flag CIFS Disposition |
| 196 | * ---------- ---------------- |
| 197 | * O_CREAT FILE_OPEN_IF |
| 198 | * O_CREAT | O_EXCL FILE_CREATE |
| 199 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| 200 | * O_TRUNC FILE_OVERWRITE |
| 201 | * none of the above FILE_OPEN |
| 202 | * |
| 203 | * Note that there is not a direct match between disposition |
| 204 | * FILE_SUPERSEDE (ie create whether or not file exists although |
| 205 | * O_CREAT | O_TRUNC is similar but truncates the existing |
| 206 | * file rather than creating a new file as FILE_SUPERSEDE does |
| 207 | * (which uses the attributes / metadata passed in on open call) |
| 208 | *? |
| 209 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
| 210 | *? and the read write flags match reasonably. O_LARGEFILE |
| 211 | *? is irrelevant because largefile support is always used |
| 212 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| 213 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| 214 | *********************************************************************/ |
| 215 | |
| 216 | disposition = cifs_get_disposition(f_flags); |
| 217 | |
| 218 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
| 219 | |
| 220 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 221 | if (!buf) |
| 222 | return -ENOMEM; |
| 223 | |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 224 | if (backup_cred(cifs_sb)) |
| 225 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 226 | |
Steve French | 18a89a1 | 2017-09-22 01:40:27 -0500 | [diff] [blame] | 227 | /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
| 228 | if (f_flags & O_SYNC) |
| 229 | create_options |= CREATE_WRITE_THROUGH; |
| 230 | |
| 231 | if (f_flags & O_DIRECT) |
| 232 | create_options |= CREATE_NO_BUFFER; |
| 233 | |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 234 | oparms.tcon = tcon; |
| 235 | oparms.cifs_sb = cifs_sb; |
| 236 | oparms.desired_access = desired_access; |
| 237 | oparms.create_options = create_options; |
| 238 | oparms.disposition = disposition; |
| 239 | oparms.path = full_path; |
| 240 | oparms.fid = fid; |
Pavel Shilovsky | 9cbc0b7 | 2013-07-09 18:40:58 +0400 | [diff] [blame] | 241 | oparms.reconnect = false; |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 242 | |
| 243 | rc = server->ops->open(xid, &oparms, oplock, buf); |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 244 | |
| 245 | if (rc) |
| 246 | goto out; |
| 247 | |
| 248 | if (tcon->unix_ext) |
| 249 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
| 250 | xid); |
| 251 | else |
| 252 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
Steve French | 42eacf9 | 2014-02-10 14:08:16 -0600 | [diff] [blame] | 253 | xid, fid); |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 254 | |
| 255 | out: |
| 256 | kfree(buf); |
| 257 | return rc; |
| 258 | } |
| 259 | |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 260 | static bool |
| 261 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) |
| 262 | { |
| 263 | struct cifs_fid_locks *cur; |
| 264 | bool has_locks = false; |
| 265 | |
| 266 | down_read(&cinode->lock_sem); |
| 267 | list_for_each_entry(cur, &cinode->llist, llist) { |
| 268 | if (!list_empty(&cur->locks)) { |
| 269 | has_locks = true; |
| 270 | break; |
| 271 | } |
| 272 | } |
| 273 | up_read(&cinode->lock_sem); |
| 274 | return has_locks; |
| 275 | } |
| 276 | |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 277 | struct cifsFileInfo * |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 278 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 279 | struct tcon_link *tlink, __u32 oplock) |
| 280 | { |
Goldwyn Rodrigues | 1f1735c | 2016-04-18 06:41:52 -0500 | [diff] [blame] | 281 | struct dentry *dentry = file_dentry(file); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 282 | struct inode *inode = d_inode(dentry); |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 283 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
| 284 | struct cifsFileInfo *cfile; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 285 | struct cifs_fid_locks *fdlocks; |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 286 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 287 | struct TCP_Server_Info *server = tcon->ses->server; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 288 | |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 289 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| 290 | if (cfile == NULL) |
| 291 | return cfile; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 292 | |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 293 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
| 294 | if (!fdlocks) { |
| 295 | kfree(cfile); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | INIT_LIST_HEAD(&fdlocks->locks); |
| 300 | fdlocks->cfile = cfile; |
| 301 | cfile->llist = fdlocks; |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 302 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 303 | list_add(&fdlocks->llist, &cinode->llist); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 304 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 305 | |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 306 | cfile->count = 1; |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 307 | cfile->pid = current->tgid; |
| 308 | cfile->uid = current_fsuid(); |
| 309 | cfile->dentry = dget(dentry); |
| 310 | cfile->f_flags = file->f_flags; |
| 311 | cfile->invalidHandle = false; |
| 312 | cfile->tlink = cifs_get_tlink(tlink); |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 313 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 314 | mutex_init(&cfile->fh_mutex); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 315 | spin_lock_init(&cfile->file_info_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 316 | |
Mateusz Guzik | 24261fc | 2013-03-08 16:30:03 +0100 | [diff] [blame] | 317 | cifs_sb_active(inode->i_sb); |
| 318 | |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 319 | /* |
| 320 | * If the server returned a read oplock and we have mandatory brlocks, |
| 321 | * set oplock level to None. |
| 322 | */ |
Pavel Shilovsky | 53ef101 | 2013-09-05 16:11:28 +0400 | [diff] [blame] | 323 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 324 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 325 | oplock = 0; |
| 326 | } |
| 327 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 328 | spin_lock(&tcon->open_file_lock); |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 329 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 330 | oplock = fid->pending_open->oplock; |
| 331 | list_del(&fid->pending_open->olist); |
| 332 | |
Pavel Shilovsky | 42873b0 | 2013-09-05 21:30:16 +0400 | [diff] [blame] | 333 | fid->purge_cache = false; |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 334 | server->ops->set_fid(cfile, fid, oplock); |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 335 | |
| 336 | list_add(&cfile->tlist, &tcon->openFileList); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 337 | |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 338 | /* if readable file instance put first in list*/ |
| 339 | if (file->f_mode & FMODE_READ) |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 340 | list_add(&cfile->flist, &cinode->openFileList); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 341 | else |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 342 | list_add_tail(&cfile->flist, &cinode->openFileList); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 343 | spin_unlock(&tcon->open_file_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 344 | |
Pavel Shilovsky | 42873b0 | 2013-09-05 21:30:16 +0400 | [diff] [blame] | 345 | if (fid->purge_cache) |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 346 | cifs_zap_mapping(inode); |
Pavel Shilovsky | 42873b0 | 2013-09-05 21:30:16 +0400 | [diff] [blame] | 347 | |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 348 | file->private_data = cfile; |
| 349 | return cfile; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 350 | } |
| 351 | |
Jeff Layton | 764a1b1 | 2012-07-25 14:59:54 -0400 | [diff] [blame] | 352 | struct cifsFileInfo * |
| 353 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) |
| 354 | { |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 355 | spin_lock(&cifs_file->file_info_lock); |
Jeff Layton | 764a1b1 | 2012-07-25 14:59:54 -0400 | [diff] [blame] | 356 | cifsFileInfo_get_locked(cifs_file); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 357 | spin_unlock(&cifs_file->file_info_lock); |
Jeff Layton | 764a1b1 | 2012-07-25 14:59:54 -0400 | [diff] [blame] | 358 | return cifs_file; |
| 359 | } |
| 360 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 361 | /* |
| 362 | * Release a reference on the file private data. This may involve closing |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 363 | * the filehandle out on the server. Must be called without holding |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 364 | * tcon->open_file_lock and cifs_file->file_info_lock. |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 365 | */ |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 366 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
| 367 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 368 | struct inode *inode = d_inode(cifs_file->dentry); |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 369 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 370 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 371 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
Mateusz Guzik | 24261fc | 2013-03-08 16:30:03 +0100 | [diff] [blame] | 372 | struct super_block *sb = inode->i_sb; |
| 373 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 374 | struct cifsLockInfo *li, *tmp; |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 375 | struct cifs_fid fid; |
| 376 | struct cifs_pending_open open; |
Sachin Prabhu | ca7df8e | 2015-01-15 12:22:04 +0000 | [diff] [blame] | 377 | bool oplock_break_cancelled; |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 378 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 379 | spin_lock(&tcon->open_file_lock); |
| 380 | |
| 381 | spin_lock(&cifs_file->file_info_lock); |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 382 | if (--cifs_file->count > 0) { |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 383 | spin_unlock(&cifs_file->file_info_lock); |
| 384 | spin_unlock(&tcon->open_file_lock); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 385 | return; |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 386 | } |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 387 | spin_unlock(&cifs_file->file_info_lock); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 388 | |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 389 | if (server->ops->get_lease_key) |
| 390 | server->ops->get_lease_key(inode, &fid); |
| 391 | |
| 392 | /* store open in pending opens to make sure we don't miss lease break */ |
| 393 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); |
| 394 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 395 | /* remove it from the lists */ |
| 396 | list_del(&cifs_file->flist); |
| 397 | list_del(&cifs_file->tlist); |
| 398 | |
| 399 | if (list_empty(&cifsi->openFileList)) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 400 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 401 | d_inode(cifs_file->dentry)); |
Pavel Shilovsky | 2536413 | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 402 | /* |
| 403 | * In strict cache mode we need invalidate mapping on the last |
| 404 | * close because it may cause a error when we open this file |
| 405 | * again and get at least level II oplock. |
| 406 | */ |
Pavel Shilovsky | 4f8ba8a | 2010-11-21 22:36:12 +0300 | [diff] [blame] | 407 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
Jeff Layton | aff8d5c | 2014-04-30 09:31:45 -0400 | [diff] [blame] | 408 | set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 409 | cifs_set_oplock_level(cifsi, 0); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 410 | } |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 411 | |
| 412 | spin_unlock(&tcon->open_file_lock); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 413 | |
Sachin Prabhu | ca7df8e | 2015-01-15 12:22:04 +0000 | [diff] [blame] | 414 | oplock_break_cancelled = cancel_work_sync(&cifs_file->oplock_break); |
Jeff Layton | ad63594 | 2011-07-26 12:20:17 -0400 | [diff] [blame] | 415 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 416 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
Pavel Shilovsky | 0ff78a2 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 417 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 418 | unsigned int xid; |
Pavel Shilovsky | 0ff78a2 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 419 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 420 | xid = get_xid(); |
Pavel Shilovsky | 0ff78a2 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 421 | if (server->ops->close) |
Pavel Shilovsky | 760ad0c | 2012-09-25 11:00:07 +0400 | [diff] [blame] | 422 | server->ops->close(xid, tcon, &cifs_file->fid); |
| 423 | _free_xid(xid); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 424 | } |
| 425 | |
Sachin Prabhu | ca7df8e | 2015-01-15 12:22:04 +0000 | [diff] [blame] | 426 | if (oplock_break_cancelled) |
| 427 | cifs_done_oplock_break(cifsi); |
| 428 | |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 429 | cifs_del_pending_open(&open); |
| 430 | |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 431 | /* |
| 432 | * Delete any outstanding lock records. We'll lose them when the file |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 433 | * is closed anyway. |
| 434 | */ |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 435 | down_write(&cifsi->lock_sem); |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 436 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 437 | list_del(&li->llist); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 438 | cifs_del_lock_waiters(li); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 439 | kfree(li); |
| 440 | } |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 441 | list_del(&cifs_file->llist->llist); |
| 442 | kfree(cifs_file->llist); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 443 | up_write(&cifsi->lock_sem); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 444 | |
| 445 | cifs_put_tlink(cifs_file->tlink); |
| 446 | dput(cifs_file->dentry); |
Mateusz Guzik | 24261fc | 2013-03-08 16:30:03 +0100 | [diff] [blame] | 447 | cifs_sb_deactive(sb); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 448 | kfree(cifs_file); |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | int cifs_open(struct inode *inode, struct file *file) |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | { |
| 454 | int rc = -EACCES; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 455 | unsigned int xid; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 456 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | struct cifs_sb_info *cifs_sb; |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 458 | struct TCP_Server_Info *server; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 459 | struct cifs_tcon *tcon; |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 460 | struct tcon_link *tlink; |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 461 | struct cifsFileInfo *cfile = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | char *full_path = NULL; |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 463 | bool posix_open_ok = false; |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 464 | struct cifs_fid fid; |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 465 | struct cifs_pending_open open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 467 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | cifs_sb = CIFS_SB(inode->i_sb); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 470 | tlink = cifs_sb_tlink(cifs_sb); |
| 471 | if (IS_ERR(tlink)) { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 472 | free_xid(xid); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 473 | return PTR_ERR(tlink); |
| 474 | } |
| 475 | tcon = tlink_tcon(tlink); |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 476 | server = tcon->ses->server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Goldwyn Rodrigues | 1f1735c | 2016-04-18 06:41:52 -0500 | [diff] [blame] | 478 | full_path = build_path_from_dentry(file_dentry(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | if (full_path == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 480 | rc = -ENOMEM; |
Jeff Layton | 232341b | 2010-08-05 13:58:38 -0400 | [diff] [blame] | 481 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | } |
| 483 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 484 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 485 | inode, file->f_flags, full_path); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 486 | |
Namjae Jeon | 787aded | 2014-08-22 14:22:51 +0900 | [diff] [blame] | 487 | if (file->f_flags & O_DIRECT && |
| 488 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { |
| 489 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| 490 | file->f_op = &cifs_file_direct_nobrl_ops; |
| 491 | else |
| 492 | file->f_op = &cifs_file_direct_ops; |
| 493 | } |
| 494 | |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 495 | if (server->oplocks) |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 496 | oplock = REQ_OPLOCK; |
| 497 | else |
| 498 | oplock = 0; |
| 499 | |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 500 | if (!tcon->broken_posix_open && tcon->unix_ext && |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 501 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 502 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 503 | /* can not refresh inode info since size could be stale */ |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 504 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
Steve French | fa588e0 | 2010-04-22 19:21:55 +0000 | [diff] [blame] | 505 | cifs_sb->mnt_file_mode /* ignored */, |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 506 | file->f_flags, &oplock, &fid.netfid, xid); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 507 | if (rc == 0) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 508 | cifs_dbg(FYI, "posix open succeeded\n"); |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 509 | posix_open_ok = true; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 510 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
| 511 | if (tcon->ses->serverNOS) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 512 | cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
| 513 | tcon->ses->serverName, |
| 514 | tcon->ses->serverNOS); |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 515 | tcon->broken_posix_open = true; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 516 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
| 517 | (rc != -EOPNOTSUPP)) /* path not found or net err */ |
| 518 | goto out; |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 519 | /* |
| 520 | * Else fallthrough to retry open the old way on network i/o |
| 521 | * or DFS errors. |
| 522 | */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 523 | } |
| 524 | |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 525 | if (server->ops->get_lease_key) |
| 526 | server->ops->get_lease_key(inode, &fid); |
| 527 | |
| 528 | cifs_add_pending_open(&fid, tlink, &open); |
| 529 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 530 | if (!posix_open_ok) { |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 531 | if (server->ops->get_lease_key) |
| 532 | server->ops->get_lease_key(inode, &fid); |
| 533 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 534 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 535 | file->f_flags, &oplock, &fid, xid); |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 536 | if (rc) { |
| 537 | cifs_del_pending_open(&open); |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 538 | goto out; |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 539 | } |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 540 | } |
Jeff Layton | 47c78b7 | 2010-06-16 13:40:17 -0400 | [diff] [blame] | 541 | |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 542 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
| 543 | if (cfile == NULL) { |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 544 | if (server->ops->close) |
| 545 | server->ops->close(xid, tcon, &fid); |
Pavel Shilovsky | 233839b | 2012-09-19 06:22:45 -0700 | [diff] [blame] | 546 | cifs_del_pending_open(&open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | rc = -ENOMEM; |
| 548 | goto out; |
| 549 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Suresh Jayaraman | 9451a9a | 2010-07-05 18:12:45 +0530 | [diff] [blame] | 551 | cifs_fscache_set_inode_cookie(inode, file); |
| 552 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 553 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 554 | /* |
| 555 | * Time to set mode which we can not set earlier due to |
| 556 | * problems creating new read-only files. |
| 557 | */ |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 558 | struct cifs_unix_set_info_args args = { |
| 559 | .mode = inode->i_mode, |
Eric W. Biederman | 49418b2 | 2013-02-06 00:57:56 -0800 | [diff] [blame] | 560 | .uid = INVALID_UID, /* no change */ |
| 561 | .gid = INVALID_GID, /* no change */ |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 562 | .ctime = NO_CHANGE_64, |
| 563 | .atime = NO_CHANGE_64, |
| 564 | .mtime = NO_CHANGE_64, |
| 565 | .device = 0, |
| 566 | }; |
Pavel Shilovsky | fb1214e | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 567 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
| 568 | cfile->pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | kfree(full_path); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 573 | free_xid(xid); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 574 | cifs_put_tlink(tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | return rc; |
| 576 | } |
| 577 | |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 578 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
| 579 | |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 580 | /* |
| 581 | * Try to reacquire byte range locks that were released when session |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 582 | * to server was lost. |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 583 | */ |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 584 | static int |
| 585 | cifs_relock_file(struct cifsFileInfo *cfile) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 587 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 588 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 589 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | int rc = 0; |
| 591 | |
Pavel Shilovsky | 689c3db | 2013-07-11 11:17:45 +0400 | [diff] [blame] | 592 | down_read(&cinode->lock_sem); |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 593 | if (cinode->can_cache_brlcks) { |
Pavel Shilovsky | 689c3db | 2013-07-11 11:17:45 +0400 | [diff] [blame] | 594 | /* can cache locks - no need to relock */ |
| 595 | up_read(&cinode->lock_sem); |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 596 | return rc; |
| 597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Pavel Shilovsky | f152fd5 | 2012-11-22 17:10:57 +0400 | [diff] [blame] | 599 | if (cap_unix(tcon->ses) && |
| 600 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 601 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| 602 | rc = cifs_push_posix_locks(cfile); |
| 603 | else |
| 604 | rc = tcon->ses->server->ops->push_mand_locks(cfile); |
| 605 | |
Pavel Shilovsky | 689c3db | 2013-07-11 11:17:45 +0400 | [diff] [blame] | 606 | up_read(&cinode->lock_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | return rc; |
| 608 | } |
| 609 | |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 610 | static int |
| 611 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | { |
| 613 | int rc = -EACCES; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 614 | unsigned int xid; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 615 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | struct cifs_sb_info *cifs_sb; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 617 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 618 | struct TCP_Server_Info *server; |
| 619 | struct cifsInodeInfo *cinode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 620 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | char *full_path = NULL; |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 622 | int desired_access; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | int disposition = FILE_OPEN; |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 624 | int create_options = CREATE_NOT_DIR; |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 625 | struct cifs_open_parms oparms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 627 | xid = get_xid(); |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 628 | mutex_lock(&cfile->fh_mutex); |
| 629 | if (!cfile->invalidHandle) { |
| 630 | mutex_unlock(&cfile->fh_mutex); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 631 | rc = 0; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 632 | free_xid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 633 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
| 635 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 636 | inode = d_inode(cfile->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | cifs_sb = CIFS_SB(inode->i_sb); |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 638 | tcon = tlink_tcon(cfile->tlink); |
| 639 | server = tcon->ses->server; |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 640 | |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 641 | /* |
| 642 | * Can not grab rename sem here because various ops, including those |
| 643 | * that already have the rename sem can end up causing writepage to get |
| 644 | * called and if the server was down that means we end up here, and we |
| 645 | * can never tell if the caller already has the rename_sem. |
| 646 | */ |
| 647 | full_path = build_path_from_dentry(cfile->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | if (full_path == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 649 | rc = -ENOMEM; |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 650 | mutex_unlock(&cfile->fh_mutex); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 651 | free_xid(xid); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 652 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 655 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
| 656 | inode, cfile->f_flags, full_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Pavel Shilovsky | 10b9b98 | 2012-03-20 12:55:09 +0300 | [diff] [blame] | 658 | if (tcon->ses->server->oplocks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | oplock = REQ_OPLOCK; |
| 660 | else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 661 | oplock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 663 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 664 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 665 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 666 | /* |
| 667 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the |
| 668 | * original open. Must mask them off for a reopen. |
| 669 | */ |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 670 | unsigned int oflags = cfile->f_flags & |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 671 | ~(O_CREAT | O_EXCL | O_TRUNC); |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 672 | |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 673 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 674 | cifs_sb->mnt_file_mode /* ignored */, |
Pavel Shilovsky | 9cbc0b7 | 2013-07-09 18:40:58 +0400 | [diff] [blame] | 675 | oflags, &oplock, &cfile->fid.netfid, xid); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 676 | if (rc == 0) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 677 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
Andi Shyti | fe090e4 | 2013-07-29 20:04:35 +0200 | [diff] [blame] | 678 | oparms.reconnect = true; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 679 | goto reopen_success; |
| 680 | } |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 681 | /* |
| 682 | * fallthrough to retry open the old way on errors, especially |
| 683 | * in the reconnect path it is important to retry hard |
| 684 | */ |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 685 | } |
| 686 | |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 687 | desired_access = cifs_convert_flags(cfile->f_flags); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 688 | |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 689 | if (backup_cred(cifs_sb)) |
| 690 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 691 | |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 692 | if (server->ops->get_lease_key) |
Pavel Shilovsky | 9cbc0b7 | 2013-07-09 18:40:58 +0400 | [diff] [blame] | 693 | server->ops->get_lease_key(inode, &cfile->fid); |
Pavel Shilovsky | b8c32db | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 694 | |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 695 | oparms.tcon = tcon; |
| 696 | oparms.cifs_sb = cifs_sb; |
| 697 | oparms.desired_access = desired_access; |
| 698 | oparms.create_options = create_options; |
| 699 | oparms.disposition = disposition; |
| 700 | oparms.path = full_path; |
Pavel Shilovsky | 9cbc0b7 | 2013-07-09 18:40:58 +0400 | [diff] [blame] | 701 | oparms.fid = &cfile->fid; |
| 702 | oparms.reconnect = true; |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 703 | |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 704 | /* |
| 705 | * Can not refresh inode by passing in file_info buf to be returned by |
Pavel Shilovsky | d81b8a4 | 2014-01-16 15:53:36 +0400 | [diff] [blame] | 706 | * ops->open and then calling get_inode_info with returned buf since |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 707 | * file might have write behind data that needs to be flushed and server |
| 708 | * version of file size can be stale. If we knew for sure that inode was |
| 709 | * not dirty locally we could do this. |
| 710 | */ |
Pavel Shilovsky | 226730b | 2013-07-05 12:00:30 +0400 | [diff] [blame] | 711 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
Pavel Shilovsky | b33fcf1 | 2013-07-11 10:58:30 +0400 | [diff] [blame] | 712 | if (rc == -ENOENT && oparms.reconnect == false) { |
| 713 | /* durable handle timeout is expired - open the file again */ |
| 714 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
| 715 | /* indicate that we need to relock the file */ |
| 716 | oparms.reconnect = true; |
| 717 | } |
| 718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | if (rc) { |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 720 | mutex_unlock(&cfile->fh_mutex); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 721 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
| 722 | cifs_dbg(FYI, "oplock: %d\n", oplock); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 723 | goto reopen_error_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | } |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 725 | |
| 726 | reopen_success: |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 727 | cfile->invalidHandle = false; |
| 728 | mutex_unlock(&cfile->fh_mutex); |
| 729 | cinode = CIFS_I(inode); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 730 | |
| 731 | if (can_flush) { |
| 732 | rc = filemap_write_and_wait(inode->i_mapping); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 733 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 734 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 735 | if (tcon->unix_ext) |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 736 | rc = cifs_get_inode_info_unix(&inode, full_path, |
| 737 | inode->i_sb, xid); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 738 | else |
Pavel Shilovsky | 2ae78ba | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 739 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
| 740 | inode->i_sb, xid, NULL); |
| 741 | } |
| 742 | /* |
| 743 | * Else we are writing out data to server already and could deadlock if |
| 744 | * we tried to flush data, and since we do not know if we have data that |
| 745 | * would invalidate the current end of file on the server we can not go |
| 746 | * to the server to get the new inode info. |
| 747 | */ |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 748 | |
Pavel Shilovsky | de74025 | 2016-10-11 15:34:07 -0700 | [diff] [blame] | 749 | /* |
| 750 | * If the server returned a read oplock and we have mandatory brlocks, |
| 751 | * set oplock level to None. |
| 752 | */ |
| 753 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
| 754 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
| 755 | oplock = 0; |
| 756 | } |
| 757 | |
Pavel Shilovsky | 9cbc0b7 | 2013-07-09 18:40:58 +0400 | [diff] [blame] | 758 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
| 759 | if (oparms.reconnect) |
| 760 | cifs_relock_file(cfile); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 761 | |
| 762 | reopen_error_exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | kfree(full_path); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 764 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | return rc; |
| 766 | } |
| 767 | |
| 768 | int cifs_close(struct inode *inode, struct file *file) |
| 769 | { |
Jeff Layton | 7797069 | 2011-04-05 16:23:47 -0700 | [diff] [blame] | 770 | if (file->private_data != NULL) { |
| 771 | cifsFileInfo_put(file->private_data); |
| 772 | file->private_data = NULL; |
| 773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 775 | /* return code from the ->release op is always ignored */ |
| 776 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
| 778 | |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 779 | void |
| 780 | cifs_reopen_persistent_handles(struct cifs_tcon *tcon) |
| 781 | { |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 782 | struct cifsFileInfo *open_file; |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 783 | struct list_head *tmp; |
| 784 | struct list_head *tmp1; |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 785 | struct list_head tmp_list; |
| 786 | |
Pavel Shilovsky | 46890ff | 2016-11-29 11:31:23 -0800 | [diff] [blame] | 787 | if (!tcon->use_persistent || !tcon->need_reopen_files) |
| 788 | return; |
| 789 | |
| 790 | tcon->need_reopen_files = false; |
| 791 | |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 792 | cifs_dbg(FYI, "Reopen persistent handles"); |
| 793 | INIT_LIST_HEAD(&tmp_list); |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 794 | |
| 795 | /* list all files open on tree connection, reopen resilient handles */ |
| 796 | spin_lock(&tcon->open_file_lock); |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 797 | list_for_each(tmp, &tcon->openFileList) { |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 798 | open_file = list_entry(tmp, struct cifsFileInfo, tlist); |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 799 | if (!open_file->invalidHandle) |
| 800 | continue; |
| 801 | cifsFileInfo_get(open_file); |
| 802 | list_add_tail(&open_file->rlist, &tmp_list); |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 803 | } |
| 804 | spin_unlock(&tcon->open_file_lock); |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 805 | |
| 806 | list_for_each_safe(tmp, tmp1, &tmp_list) { |
| 807 | open_file = list_entry(tmp, struct cifsFileInfo, rlist); |
Pavel Shilovsky | 46890ff | 2016-11-29 11:31:23 -0800 | [diff] [blame] | 808 | if (cifs_reopen_file(open_file, false /* do not flush */)) |
| 809 | tcon->need_reopen_files = true; |
Pavel Shilovsky | f2cca6a | 2016-10-07 17:26:36 -0700 | [diff] [blame] | 810 | list_del_init(&open_file->rlist); |
| 811 | cifsFileInfo_put(open_file); |
| 812 | } |
Steve French | 52ace1e | 2016-09-22 19:23:56 -0500 | [diff] [blame] | 813 | } |
| 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | int cifs_closedir(struct inode *inode, struct file *file) |
| 816 | { |
| 817 | int rc = 0; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 818 | unsigned int xid; |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 819 | struct cifsFileInfo *cfile = file->private_data; |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 820 | struct cifs_tcon *tcon; |
| 821 | struct TCP_Server_Info *server; |
| 822 | char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 824 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 826 | if (cfile == NULL) |
| 827 | return rc; |
| 828 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 829 | xid = get_xid(); |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 830 | tcon = tlink_tcon(cfile->tlink); |
| 831 | server = tcon->ses->server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 833 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 834 | spin_lock(&cfile->file_info_lock); |
Pavel Shilovsky | 5275580 | 2014-08-18 20:49:57 +0400 | [diff] [blame] | 835 | if (server->ops->dir_needs_close(cfile)) { |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 836 | cfile->invalidHandle = true; |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 837 | spin_unlock(&cfile->file_info_lock); |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 838 | if (server->ops->close_dir) |
| 839 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); |
| 840 | else |
| 841 | rc = -ENOSYS; |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 842 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 843 | /* not much we can do if it fails anyway, ignore rc */ |
| 844 | rc = 0; |
| 845 | } else |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 846 | spin_unlock(&cfile->file_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 848 | buf = cfile->srch_inf.ntwrk_buf_start; |
| 849 | if (buf) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 850 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 851 | cfile->srch_inf.ntwrk_buf_start = NULL; |
| 852 | if (cfile->srch_inf.smallBuf) |
| 853 | cifs_small_buf_release(buf); |
| 854 | else |
| 855 | cifs_buf_release(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
Pavel Shilovsky | 92fc65a | 2012-09-18 16:20:32 -0700 | [diff] [blame] | 857 | |
| 858 | cifs_put_tlink(cfile->tlink); |
| 859 | kfree(file->private_data); |
| 860 | file->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | /* BB can we lock the filestruct while this is going on? */ |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 862 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | return rc; |
| 864 | } |
| 865 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 866 | static struct cifsLockInfo * |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 867 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 868 | { |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 869 | struct cifsLockInfo *lock = |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 870 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 871 | if (!lock) |
| 872 | return lock; |
| 873 | lock->offset = offset; |
| 874 | lock->length = length; |
| 875 | lock->type = type; |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 876 | lock->pid = current->tgid; |
| 877 | INIT_LIST_HEAD(&lock->blist); |
| 878 | init_waitqueue_head(&lock->block_q); |
| 879 | return lock; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 880 | } |
| 881 | |
Pavel Shilovsky | f7ba7fe | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 882 | void |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 883 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
| 884 | { |
| 885 | struct cifsLockInfo *li, *tmp; |
| 886 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { |
| 887 | list_del_init(&li->blist); |
| 888 | wake_up(&li->block_q); |
| 889 | } |
| 890 | } |
| 891 | |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 892 | #define CIFS_LOCK_OP 0 |
| 893 | #define CIFS_READ_OP 1 |
| 894 | #define CIFS_WRITE_OP 2 |
| 895 | |
| 896 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 897 | static bool |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 898 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
| 899 | __u64 length, __u8 type, struct cifsFileInfo *cfile, |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 900 | struct cifsLockInfo **conf_lock, int rw_check) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 901 | { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 902 | struct cifsLockInfo *li; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 903 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 904 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 905 | |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 906 | list_for_each_entry(li, &fdlocks->locks, llist) { |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 907 | if (offset + length <= li->offset || |
| 908 | offset >= li->offset + li->length) |
| 909 | continue; |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 910 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
| 911 | server->ops->compare_fids(cfile, cur_cfile)) { |
| 912 | /* shared lock prevents write op through the same fid */ |
| 913 | if (!(li->type & server->vals->shared_lock_type) || |
| 914 | rw_check != CIFS_WRITE_OP) |
| 915 | continue; |
| 916 | } |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 917 | if ((type & server->vals->shared_lock_type) && |
| 918 | ((server->ops->compare_fids(cfile, cur_cfile) && |
| 919 | current->tgid == li->pid) || type == li->type)) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 920 | continue; |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 921 | if (conf_lock) |
| 922 | *conf_lock = li; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 923 | return true; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 924 | } |
| 925 | return false; |
| 926 | } |
| 927 | |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 928 | bool |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 929 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 930 | __u8 type, struct cifsLockInfo **conf_lock, |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 931 | int rw_check) |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 932 | { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 933 | bool rc = false; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 934 | struct cifs_fid_locks *cur; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 935 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 936 | |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 937 | list_for_each_entry(cur, &cinode->llist, llist) { |
| 938 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 939 | cfile, conf_lock, rw_check); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 940 | if (rc) |
| 941 | break; |
| 942 | } |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 943 | |
| 944 | return rc; |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 945 | } |
| 946 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 947 | /* |
| 948 | * Check if there is another lock that prevents us to set the lock (mandatory |
| 949 | * style). If such a lock exists, update the flock structure with its |
| 950 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| 951 | * or leave it the same if we can't. Returns 0 if we don't need to request to |
| 952 | * the server or 1 otherwise. |
| 953 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 954 | static int |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 955 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
| 956 | __u8 type, struct file_lock *flock) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 957 | { |
| 958 | int rc = 0; |
| 959 | struct cifsLockInfo *conf_lock; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 960 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 961 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 962 | bool exist; |
| 963 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 964 | down_read(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 965 | |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 966 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 967 | &conf_lock, CIFS_LOCK_OP); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 968 | if (exist) { |
| 969 | flock->fl_start = conf_lock->offset; |
| 970 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; |
| 971 | flock->fl_pid = conf_lock->pid; |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 972 | if (conf_lock->type & server->vals->shared_lock_type) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 973 | flock->fl_type = F_RDLCK; |
| 974 | else |
| 975 | flock->fl_type = F_WRLCK; |
| 976 | } else if (!cinode->can_cache_brlcks) |
| 977 | rc = 1; |
| 978 | else |
| 979 | flock->fl_type = F_UNLCK; |
| 980 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 981 | up_read(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 982 | return rc; |
| 983 | } |
| 984 | |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 985 | static void |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 986 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 987 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 988 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 989 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 990 | list_add_tail(&lock->llist, &cfile->llist->locks); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 991 | up_write(&cinode->lock_sem); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 992 | } |
| 993 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 994 | /* |
| 995 | * Set the byte-range lock (mandatory style). Returns: |
| 996 | * 1) 0, if we set the lock and don't need to request to the server; |
| 997 | * 2) 1, if no locks prevent us but we need to request to the server; |
| 998 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. |
| 999 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1000 | static int |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1001 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1002 | bool wait) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1003 | { |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1004 | struct cifsLockInfo *conf_lock; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1005 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1006 | bool exist; |
| 1007 | int rc = 0; |
| 1008 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1009 | try_again: |
| 1010 | exist = false; |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1011 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1012 | |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1013 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 1014 | lock->type, &conf_lock, CIFS_LOCK_OP); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1015 | if (!exist && cinode->can_cache_brlcks) { |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1016 | list_add_tail(&lock->llist, &cfile->llist->locks); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1017 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1018 | return rc; |
| 1019 | } |
| 1020 | |
| 1021 | if (!exist) |
| 1022 | rc = 1; |
| 1023 | else if (!wait) |
| 1024 | rc = -EACCES; |
| 1025 | else { |
| 1026 | list_add_tail(&lock->blist, &conf_lock->blist); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1027 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1028 | rc = wait_event_interruptible(lock->block_q, |
| 1029 | (lock->blist.prev == &lock->blist) && |
| 1030 | (lock->blist.next == &lock->blist)); |
| 1031 | if (!rc) |
| 1032 | goto try_again; |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1033 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1034 | list_del_init(&lock->blist); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1035 | } |
| 1036 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1037 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1038 | return rc; |
| 1039 | } |
| 1040 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 1041 | /* |
| 1042 | * Check if there is another lock that prevents us to set the lock (posix |
| 1043 | * style). If such a lock exists, update the flock structure with its |
| 1044 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| 1045 | * or leave it the same if we can't. Returns 0 if we don't need to request to |
| 1046 | * the server or 1 otherwise. |
| 1047 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1048 | static int |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1049 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
| 1050 | { |
| 1051 | int rc = 0; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1052 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1053 | unsigned char saved_type = flock->fl_type; |
| 1054 | |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 1055 | if ((flock->fl_flags & FL_POSIX) == 0) |
| 1056 | return 1; |
| 1057 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1058 | down_read(&cinode->lock_sem); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1059 | posix_test_lock(file, flock); |
| 1060 | |
| 1061 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { |
| 1062 | flock->fl_type = saved_type; |
| 1063 | rc = 1; |
| 1064 | } |
| 1065 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1066 | up_read(&cinode->lock_sem); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1067 | return rc; |
| 1068 | } |
| 1069 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 1070 | /* |
| 1071 | * Set the byte-range lock (posix style). Returns: |
| 1072 | * 1) 0, if we set the lock and don't need to request to the server; |
| 1073 | * 2) 1, if we need to request to the server; |
| 1074 | * 3) <0, if the error occurs while setting the lock. |
| 1075 | */ |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1076 | static int |
| 1077 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) |
| 1078 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1079 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 1080 | int rc = 1; |
| 1081 | |
| 1082 | if ((flock->fl_flags & FL_POSIX) == 0) |
| 1083 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1084 | |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 1085 | try_again: |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1086 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1087 | if (!cinode->can_cache_brlcks) { |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1088 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 1089 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1090 | } |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 1091 | |
| 1092 | rc = posix_lock_file(file, flock, NULL); |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1093 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 1094 | if (rc == FILE_LOCK_DEFERRED) { |
| 1095 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); |
| 1096 | if (!rc) |
| 1097 | goto try_again; |
Jeff Layton | 1a9e64a | 2013-06-21 08:58:10 -0400 | [diff] [blame] | 1098 | posix_unblock_lock(flock); |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 1099 | } |
Steve French | 9ebb389 | 2012-04-01 13:52:54 -0500 | [diff] [blame] | 1100 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1101 | } |
| 1102 | |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1103 | int |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1104 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1105 | { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1106 | unsigned int xid; |
| 1107 | int rc = 0, stored_rc; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1108 | struct cifsLockInfo *li, *tmp; |
| 1109 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1110 | unsigned int num, max_num, max_buf; |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1111 | LOCKING_ANDX_RANGE *buf, *cur; |
| 1112 | int types[] = {LOCKING_ANDX_LARGE_FILES, |
| 1113 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; |
| 1114 | int i; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1115 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1116 | xid = get_xid(); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1117 | tcon = tlink_tcon(cfile->tlink); |
| 1118 | |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1119 | /* |
| 1120 | * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| 1121 | * and check it for zero before using. |
| 1122 | */ |
| 1123 | max_buf = tcon->ses->server->maxBuf; |
| 1124 | if (!max_buf) { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1125 | free_xid(xid); |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1126 | return -EINVAL; |
| 1127 | } |
| 1128 | |
| 1129 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
| 1130 | sizeof(LOCKING_ANDX_RANGE); |
Fabian Frederick | 4b99d39 | 2014-12-10 15:41:17 -0800 | [diff] [blame] | 1131 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1132 | if (!buf) { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1133 | free_xid(xid); |
Pavel Shilovsky | e2f2886 | 2012-08-29 21:13:38 +0400 | [diff] [blame] | 1134 | return -ENOMEM; |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1135 | } |
| 1136 | |
| 1137 | for (i = 0; i < 2; i++) { |
| 1138 | cur = buf; |
| 1139 | num = 0; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1140 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1141 | if (li->type != types[i]) |
| 1142 | continue; |
| 1143 | cur->Pid = cpu_to_le16(li->pid); |
| 1144 | cur->LengthLow = cpu_to_le32((u32)li->length); |
| 1145 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| 1146 | cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| 1147 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| 1148 | if (++num == max_num) { |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1149 | stored_rc = cifs_lockv(xid, tcon, |
| 1150 | cfile->fid.netfid, |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1151 | (__u8)li->type, 0, num, |
| 1152 | buf); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1153 | if (stored_rc) |
| 1154 | rc = stored_rc; |
| 1155 | cur = buf; |
| 1156 | num = 0; |
| 1157 | } else |
| 1158 | cur++; |
| 1159 | } |
| 1160 | |
| 1161 | if (num) { |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1162 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1163 | (__u8)types[i], 0, num, buf); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1164 | if (stored_rc) |
| 1165 | rc = stored_rc; |
| 1166 | } |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1167 | } |
| 1168 | |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 1169 | kfree(buf); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1170 | free_xid(xid); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1171 | return rc; |
| 1172 | } |
| 1173 | |
Jeff Layton | 3d22462 | 2016-05-24 06:27:44 -0400 | [diff] [blame] | 1174 | static __u32 |
| 1175 | hash_lockowner(fl_owner_t owner) |
| 1176 | { |
| 1177 | return cifs_lock_secret ^ hash32_ptr((const void *)owner); |
| 1178 | } |
| 1179 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1180 | struct lock_to_push { |
| 1181 | struct list_head llist; |
| 1182 | __u64 offset; |
| 1183 | __u64 length; |
| 1184 | __u32 pid; |
| 1185 | __u16 netfid; |
| 1186 | __u8 type; |
| 1187 | }; |
| 1188 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1189 | static int |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1190 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1191 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1192 | struct inode *inode = d_inode(cfile->dentry); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1193 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 1194 | struct file_lock *flock; |
| 1195 | struct file_lock_context *flctx = inode->i_flctx; |
Jeff Layton | e084c1b | 2015-02-16 14:32:03 -0500 | [diff] [blame] | 1196 | unsigned int count = 0, i; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1197 | int rc = 0, xid, type; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1198 | struct list_head locks_to_send, *el; |
| 1199 | struct lock_to_push *lck, *tmp; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1200 | __u64 length; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1201 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1202 | xid = get_xid(); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1203 | |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 1204 | if (!flctx) |
| 1205 | goto out; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1206 | |
Jeff Layton | e084c1b | 2015-02-16 14:32:03 -0500 | [diff] [blame] | 1207 | spin_lock(&flctx->flc_lock); |
| 1208 | list_for_each(el, &flctx->flc_posix) { |
| 1209 | count++; |
| 1210 | } |
| 1211 | spin_unlock(&flctx->flc_lock); |
| 1212 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1213 | INIT_LIST_HEAD(&locks_to_send); |
| 1214 | |
| 1215 | /* |
Jeff Layton | e084c1b | 2015-02-16 14:32:03 -0500 | [diff] [blame] | 1216 | * Allocating count locks is enough because no FL_POSIX locks can be |
| 1217 | * added to the list while we are holding cinode->lock_sem that |
Pavel Shilovsky | ce85852 | 2012-03-17 09:46:55 +0300 | [diff] [blame] | 1218 | * protects locking operations of this inode. |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1219 | */ |
Jeff Layton | e084c1b | 2015-02-16 14:32:03 -0500 | [diff] [blame] | 1220 | for (i = 0; i < count; i++) { |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1221 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
| 1222 | if (!lck) { |
| 1223 | rc = -ENOMEM; |
| 1224 | goto err_out; |
| 1225 | } |
| 1226 | list_add_tail(&lck->llist, &locks_to_send); |
| 1227 | } |
| 1228 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1229 | el = locks_to_send.next; |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 1230 | spin_lock(&flctx->flc_lock); |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 1231 | list_for_each_entry(flock, &flctx->flc_posix, fl_list) { |
Pavel Shilovsky | ce85852 | 2012-03-17 09:46:55 +0300 | [diff] [blame] | 1232 | if (el == &locks_to_send) { |
| 1233 | /* |
| 1234 | * The list ended. We don't have enough allocated |
| 1235 | * structures - something is really wrong. |
| 1236 | */ |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1237 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
Pavel Shilovsky | ce85852 | 2012-03-17 09:46:55 +0300 | [diff] [blame] | 1238 | break; |
| 1239 | } |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1240 | length = 1 + flock->fl_end - flock->fl_start; |
| 1241 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) |
| 1242 | type = CIFS_RDLCK; |
| 1243 | else |
| 1244 | type = CIFS_WRLCK; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1245 | lck = list_entry(el, struct lock_to_push, llist); |
Jeff Layton | 3d22462 | 2016-05-24 06:27:44 -0400 | [diff] [blame] | 1246 | lck->pid = hash_lockowner(flock->fl_owner); |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1247 | lck->netfid = cfile->fid.netfid; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1248 | lck->length = length; |
| 1249 | lck->type = type; |
| 1250 | lck->offset = flock->fl_start; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1251 | } |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 1252 | spin_unlock(&flctx->flc_lock); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1253 | |
| 1254 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1255 | int stored_rc; |
| 1256 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1257 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
Jeff Layton | c5fd363 | 2012-07-23 13:28:37 -0400 | [diff] [blame] | 1258 | lck->offset, lck->length, NULL, |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1259 | lck->type, 0); |
| 1260 | if (stored_rc) |
| 1261 | rc = stored_rc; |
| 1262 | list_del(&lck->llist); |
| 1263 | kfree(lck); |
| 1264 | } |
| 1265 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1266 | out: |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1267 | free_xid(xid); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1268 | return rc; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1269 | err_out: |
| 1270 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
| 1271 | list_del(&lck->llist); |
| 1272 | kfree(lck); |
| 1273 | } |
| 1274 | goto out; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | static int |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1278 | cifs_push_locks(struct cifsFileInfo *cfile) |
Pavel Shilovsky | 9ec3c88 | 2012-11-22 17:00:10 +0400 | [diff] [blame] | 1279 | { |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1280 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1281 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1282 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 9ec3c88 | 2012-11-22 17:00:10 +0400 | [diff] [blame] | 1283 | int rc = 0; |
| 1284 | |
| 1285 | /* we are going to update can_cache_brlcks here - need a write access */ |
| 1286 | down_write(&cinode->lock_sem); |
| 1287 | if (!cinode->can_cache_brlcks) { |
| 1288 | up_write(&cinode->lock_sem); |
| 1289 | return rc; |
| 1290 | } |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1291 | |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 1292 | if (cap_unix(tcon->ses) && |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1293 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 1294 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1295 | rc = cifs_push_posix_locks(cfile); |
| 1296 | else |
| 1297 | rc = tcon->ses->server->ops->push_mand_locks(cfile); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1298 | |
Pavel Shilovsky | b8db928 | 2012-11-22 17:07:16 +0400 | [diff] [blame] | 1299 | cinode->can_cache_brlcks = false; |
| 1300 | up_write(&cinode->lock_sem); |
| 1301 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1302 | } |
| 1303 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1304 | static void |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1305 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1306 | bool *wait_flag, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | { |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1308 | if (flock->fl_flags & FL_POSIX) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1309 | cifs_dbg(FYI, "Posix\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1310 | if (flock->fl_flags & FL_FLOCK) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1311 | cifs_dbg(FYI, "Flock\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1312 | if (flock->fl_flags & FL_SLEEP) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1313 | cifs_dbg(FYI, "Blocking lock\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1314 | *wait_flag = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | } |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1316 | if (flock->fl_flags & FL_ACCESS) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1317 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1318 | if (flock->fl_flags & FL_LEASE) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1319 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1320 | if (flock->fl_flags & |
Jeff Layton | 3d6d854 | 2012-09-19 06:22:46 -0700 | [diff] [blame] | 1321 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
| 1322 | FL_ACCESS | FL_LEASE | FL_CLOSE))) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1323 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1325 | *type = server->vals->large_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1326 | if (flock->fl_type == F_WRLCK) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1327 | cifs_dbg(FYI, "F_WRLCK\n"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1328 | *type |= server->vals->exclusive_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1329 | *lock = 1; |
| 1330 | } else if (flock->fl_type == F_UNLCK) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1331 | cifs_dbg(FYI, "F_UNLCK\n"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1332 | *type |= server->vals->unlock_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1333 | *unlock = 1; |
| 1334 | /* Check if unlock includes more than one lock range */ |
| 1335 | } else if (flock->fl_type == F_RDLCK) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1336 | cifs_dbg(FYI, "F_RDLCK\n"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1337 | *type |= server->vals->shared_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1338 | *lock = 1; |
| 1339 | } else if (flock->fl_type == F_EXLCK) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1340 | cifs_dbg(FYI, "F_EXLCK\n"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1341 | *type |= server->vals->exclusive_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1342 | *lock = 1; |
| 1343 | } else if (flock->fl_type == F_SHLCK) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1344 | cifs_dbg(FYI, "F_SHLCK\n"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1345 | *type |= server->vals->shared_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1346 | *lock = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | } else |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1348 | cifs_dbg(FYI, "Unknown type of lock\n"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1349 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1351 | static int |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1352 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1353 | bool wait_flag, bool posix_lck, unsigned int xid) |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1354 | { |
| 1355 | int rc = 0; |
| 1356 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1357 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| 1358 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1359 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1360 | __u16 netfid = cfile->fid.netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1362 | if (posix_lck) { |
| 1363 | int posix_lock_type; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1364 | |
| 1365 | rc = cifs_posix_lock_test(file, flock); |
| 1366 | if (!rc) |
| 1367 | return rc; |
| 1368 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1369 | if (type & server->vals->shared_lock_type) |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1370 | posix_lock_type = CIFS_RDLCK; |
| 1371 | else |
| 1372 | posix_lock_type = CIFS_WRLCK; |
Jeff Layton | 3d22462 | 2016-05-24 06:27:44 -0400 | [diff] [blame] | 1373 | rc = CIFSSMBPosixLock(xid, tcon, netfid, |
| 1374 | hash_lockowner(flock->fl_owner), |
Jeff Layton | c5fd363 | 2012-07-23 13:28:37 -0400 | [diff] [blame] | 1375 | flock->fl_start, length, flock, |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1376 | posix_lock_type, wait_flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | return rc; |
| 1378 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1379 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1380 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1381 | if (!rc) |
| 1382 | return rc; |
| 1383 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1384 | /* BB we could chain these into one lock request BB */ |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1385 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
| 1386 | 1, 0, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1387 | if (rc == 0) { |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1388 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| 1389 | type, 0, 1, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1390 | flock->fl_type = F_UNLCK; |
| 1391 | if (rc != 0) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1392 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
| 1393 | rc); |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1394 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1395 | } |
| 1396 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1397 | if (type & server->vals->shared_lock_type) { |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1398 | flock->fl_type = F_WRLCK; |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1399 | return 0; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1400 | } |
| 1401 | |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1402 | type &= ~server->vals->exclusive_lock_type; |
| 1403 | |
| 1404 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| 1405 | type | server->vals->shared_lock_type, |
| 1406 | 1, 0, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1407 | if (rc == 0) { |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1408 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| 1409 | type | server->vals->shared_lock_type, 0, 1, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1410 | flock->fl_type = F_RDLCK; |
| 1411 | if (rc != 0) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1412 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
| 1413 | rc); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1414 | } else |
| 1415 | flock->fl_type = F_WRLCK; |
| 1416 | |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1417 | return 0; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1418 | } |
| 1419 | |
Pavel Shilovsky | f7ba7fe | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1420 | void |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1421 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
| 1422 | { |
| 1423 | struct list_head *li, *tmp; |
| 1424 | list_for_each_safe(li, tmp, source) |
| 1425 | list_move(li, dest); |
| 1426 | } |
| 1427 | |
Pavel Shilovsky | f7ba7fe | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1428 | void |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1429 | cifs_free_llist(struct list_head *llist) |
| 1430 | { |
| 1431 | struct cifsLockInfo *li, *tmp; |
| 1432 | list_for_each_entry_safe(li, tmp, llist, llist) { |
| 1433 | cifs_del_lock_waiters(li); |
| 1434 | list_del(&li->llist); |
| 1435 | kfree(li); |
| 1436 | } |
| 1437 | } |
| 1438 | |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1439 | int |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1440 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
| 1441 | unsigned int xid) |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1442 | { |
| 1443 | int rc = 0, stored_rc; |
| 1444 | int types[] = {LOCKING_ANDX_LARGE_FILES, |
| 1445 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; |
| 1446 | unsigned int i; |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1447 | unsigned int max_num, num, max_buf; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1448 | LOCKING_ANDX_RANGE *buf, *cur; |
| 1449 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1450 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1451 | struct cifsLockInfo *li, *tmp; |
| 1452 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
| 1453 | struct list_head tmp_llist; |
| 1454 | |
| 1455 | INIT_LIST_HEAD(&tmp_llist); |
| 1456 | |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1457 | /* |
| 1458 | * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| 1459 | * and check it for zero before using. |
| 1460 | */ |
| 1461 | max_buf = tcon->ses->server->maxBuf; |
| 1462 | if (!max_buf) |
| 1463 | return -EINVAL; |
| 1464 | |
| 1465 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
| 1466 | sizeof(LOCKING_ANDX_RANGE); |
Fabian Frederick | 4b99d39 | 2014-12-10 15:41:17 -0800 | [diff] [blame] | 1467 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1468 | if (!buf) |
| 1469 | return -ENOMEM; |
| 1470 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1471 | down_write(&cinode->lock_sem); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1472 | for (i = 0; i < 2; i++) { |
| 1473 | cur = buf; |
| 1474 | num = 0; |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1475 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1476 | if (flock->fl_start > li->offset || |
| 1477 | (flock->fl_start + length) < |
| 1478 | (li->offset + li->length)) |
| 1479 | continue; |
| 1480 | if (current->tgid != li->pid) |
| 1481 | continue; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1482 | if (types[i] != li->type) |
| 1483 | continue; |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1484 | if (cinode->can_cache_brlcks) { |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1485 | /* |
| 1486 | * We can cache brlock requests - simply remove |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1487 | * a lock from the file's list. |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1488 | */ |
| 1489 | list_del(&li->llist); |
| 1490 | cifs_del_lock_waiters(li); |
| 1491 | kfree(li); |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1492 | continue; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1493 | } |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1494 | cur->Pid = cpu_to_le16(li->pid); |
| 1495 | cur->LengthLow = cpu_to_le32((u32)li->length); |
| 1496 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| 1497 | cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| 1498 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| 1499 | /* |
| 1500 | * We need to save a lock here to let us add it again to |
| 1501 | * the file's list if the unlock range request fails on |
| 1502 | * the server. |
| 1503 | */ |
| 1504 | list_move(&li->llist, &tmp_llist); |
| 1505 | if (++num == max_num) { |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1506 | stored_rc = cifs_lockv(xid, tcon, |
| 1507 | cfile->fid.netfid, |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1508 | li->type, num, 0, buf); |
| 1509 | if (stored_rc) { |
| 1510 | /* |
| 1511 | * We failed on the unlock range |
| 1512 | * request - add all locks from the tmp |
| 1513 | * list to the head of the file's list. |
| 1514 | */ |
| 1515 | cifs_move_llist(&tmp_llist, |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1516 | &cfile->llist->locks); |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1517 | rc = stored_rc; |
| 1518 | } else |
| 1519 | /* |
| 1520 | * The unlock range request succeed - |
| 1521 | * free the tmp list. |
| 1522 | */ |
| 1523 | cifs_free_llist(&tmp_llist); |
| 1524 | cur = buf; |
| 1525 | num = 0; |
| 1526 | } else |
| 1527 | cur++; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1528 | } |
| 1529 | if (num) { |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1530 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1531 | types[i], num, 0, buf); |
| 1532 | if (stored_rc) { |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1533 | cifs_move_llist(&tmp_llist, |
| 1534 | &cfile->llist->locks); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1535 | rc = stored_rc; |
| 1536 | } else |
| 1537 | cifs_free_llist(&tmp_llist); |
| 1538 | } |
| 1539 | } |
| 1540 | |
Pavel Shilovsky | 1b4b55a | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 1541 | up_write(&cinode->lock_sem); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1542 | kfree(buf); |
| 1543 | return rc; |
| 1544 | } |
| 1545 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1546 | static int |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1547 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1548 | bool wait_flag, bool posix_lck, int lock, int unlock, |
| 1549 | unsigned int xid) |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1550 | { |
| 1551 | int rc = 0; |
| 1552 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
| 1553 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| 1554 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1555 | struct TCP_Server_Info *server = tcon->ses->server; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1556 | struct inode *inode = d_inode(cfile->dentry); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1557 | |
| 1558 | if (posix_lck) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 1559 | int posix_lock_type; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1560 | |
| 1561 | rc = cifs_posix_lock_set(file, flock); |
| 1562 | if (!rc || rc < 0) |
| 1563 | return rc; |
| 1564 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1565 | if (type & server->vals->shared_lock_type) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 1566 | posix_lock_type = CIFS_RDLCK; |
| 1567 | else |
| 1568 | posix_lock_type = CIFS_WRLCK; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1569 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1570 | if (unlock == 1) |
Steve French | beb84dc | 2006-03-03 23:36:34 +0000 | [diff] [blame] | 1571 | posix_lock_type = CIFS_UNLCK; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1572 | |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1573 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
Jeff Layton | 3d22462 | 2016-05-24 06:27:44 -0400 | [diff] [blame] | 1574 | hash_lockowner(flock->fl_owner), |
| 1575 | flock->fl_start, length, |
Pavel Shilovsky | f45d341 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1576 | NULL, posix_lock_type, wait_flag); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1577 | goto out; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1578 | } |
| 1579 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1580 | if (lock) { |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1581 | struct cifsLockInfo *lock; |
| 1582 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1583 | lock = cifs_lock_init(flock->fl_start, length, type); |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1584 | if (!lock) |
| 1585 | return -ENOMEM; |
| 1586 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1587 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
Pavel Shilovsky | 21cb2d9 | 2012-11-22 18:56:39 +0400 | [diff] [blame] | 1588 | if (rc < 0) { |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1589 | kfree(lock); |
Pavel Shilovsky | 21cb2d9 | 2012-11-22 18:56:39 +0400 | [diff] [blame] | 1590 | return rc; |
| 1591 | } |
| 1592 | if (!rc) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1593 | goto out; |
| 1594 | |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 1595 | /* |
| 1596 | * Windows 7 server can delay breaking lease from read to None |
| 1597 | * if we set a byte-range lock on a file - break it explicitly |
| 1598 | * before sending the lock to the server to be sure the next |
| 1599 | * read won't conflict with non-overlapted locks due to |
| 1600 | * pagereading. |
| 1601 | */ |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 1602 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
| 1603 | CIFS_CACHE_READ(CIFS_I(inode))) { |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 1604 | cifs_zap_mapping(inode); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1605 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
| 1606 | inode); |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 1607 | CIFS_I(inode)->oplock = 0; |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 1608 | } |
| 1609 | |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1610 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| 1611 | type, 1, 0, wait_flag); |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1612 | if (rc) { |
| 1613 | kfree(lock); |
Pavel Shilovsky | 21cb2d9 | 2012-11-22 18:56:39 +0400 | [diff] [blame] | 1614 | return rc; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1615 | } |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1616 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1617 | cifs_lock_add(cfile, lock); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1618 | } else if (unlock) |
Pavel Shilovsky | d39a4f7 | 2012-09-19 06:22:43 -0700 | [diff] [blame] | 1619 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1620 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1621 | out: |
Chengyu Song | 00b8c95 | 2015-03-24 20:18:49 -0400 | [diff] [blame] | 1622 | if (flock->fl_flags & FL_POSIX && !rc) |
Benjamin Coddington | 4f65636 | 2015-10-22 13:38:14 -0400 | [diff] [blame] | 1623 | rc = locks_lock_file_wait(file, flock); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1624 | return rc; |
| 1625 | } |
| 1626 | |
| 1627 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) |
| 1628 | { |
| 1629 | int rc, xid; |
| 1630 | int lock = 0, unlock = 0; |
| 1631 | bool wait_flag = false; |
| 1632 | bool posix_lck = false; |
| 1633 | struct cifs_sb_info *cifs_sb; |
| 1634 | struct cifs_tcon *tcon; |
| 1635 | struct cifsInodeInfo *cinode; |
| 1636 | struct cifsFileInfo *cfile; |
| 1637 | __u16 netfid; |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1638 | __u32 type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1639 | |
| 1640 | rc = -EACCES; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1641 | xid = get_xid(); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1642 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1643 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
| 1644 | cmd, flock->fl_flags, flock->fl_type, |
| 1645 | flock->fl_start, flock->fl_end); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1646 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1647 | cfile = (struct cifsFileInfo *)file->private_data; |
| 1648 | tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1649 | |
| 1650 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, |
| 1651 | tcon->ses->server); |
| 1652 | |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 1653 | cifs_sb = CIFS_FILE_SB(file); |
Pavel Shilovsky | 4b4de76 | 2012-09-18 16:20:26 -0700 | [diff] [blame] | 1654 | netfid = cfile->fid.netfid; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1655 | cinode = CIFS_I(file_inode(file)); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1656 | |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 1657 | if (cap_unix(tcon->ses) && |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1658 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 1659 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| 1660 | posix_lck = true; |
| 1661 | /* |
| 1662 | * BB add code here to normalize offset and length to account for |
| 1663 | * negative length which we can not accept over the wire. |
| 1664 | */ |
| 1665 | if (IS_GETLK(cmd)) { |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1666 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1667 | free_xid(xid); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1668 | return rc; |
| 1669 | } |
| 1670 | |
| 1671 | if (!lock && !unlock) { |
| 1672 | /* |
| 1673 | * if no lock or unlock then nothing to do since we do not |
| 1674 | * know what it is |
| 1675 | */ |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1676 | free_xid(xid); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1677 | return -EOPNOTSUPP; |
| 1678 | } |
| 1679 | |
| 1680 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
| 1681 | xid); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1682 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | return rc; |
| 1684 | } |
| 1685 | |
Jeff Layton | 597b027 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1686 | /* |
| 1687 | * update the file size (if needed) after a write. Should be called with |
| 1688 | * the inode->i_lock held |
| 1689 | */ |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 1690 | void |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1691 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
| 1692 | unsigned int bytes_written) |
| 1693 | { |
| 1694 | loff_t end_of_write = offset + bytes_written; |
| 1695 | |
| 1696 | if (end_of_write > cifsi->server_eof) |
| 1697 | cifsi->server_eof = end_of_write; |
| 1698 | } |
| 1699 | |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1700 | static ssize_t |
| 1701 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, |
| 1702 | size_t write_size, loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | { |
| 1704 | int rc = 0; |
| 1705 | unsigned int bytes_written = 0; |
| 1706 | unsigned int total_written; |
| 1707 | struct cifs_sb_info *cifs_sb; |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1708 | struct cifs_tcon *tcon; |
| 1709 | struct TCP_Server_Info *server; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1710 | unsigned int xid; |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1711 | struct dentry *dentry = open_file->dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1712 | struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry)); |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1713 | struct cifs_io_parms io_parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1715 | cifs_sb = CIFS_SB(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | |
Al Viro | 35c265e | 2014-08-19 20:25:34 -0400 | [diff] [blame] | 1717 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n", |
| 1718 | write_size, *offset, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1720 | tcon = tlink_tcon(open_file->tlink); |
| 1721 | server = tcon->ses->server; |
| 1722 | |
| 1723 | if (!server->ops->sync_write) |
| 1724 | return -ENOSYS; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1725 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1726 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | for (total_written = 0; write_size > total_written; |
| 1729 | total_written += bytes_written) { |
| 1730 | rc = -EAGAIN; |
| 1731 | while (rc == -EAGAIN) { |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 1732 | struct kvec iov[2]; |
| 1733 | unsigned int len; |
| 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | /* we could deadlock if we called |
| 1737 | filemap_fdatawait from here so tell |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1738 | reopen_file not to flush data to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | server now */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1740 | rc = cifs_reopen_file(open_file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | if (rc != 0) |
| 1742 | break; |
| 1743 | } |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1744 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1745 | len = min(server->ops->wp_retry_size(d_inode(dentry)), |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 1746 | (unsigned int)write_size - total_written); |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 1747 | /* iov[0] is reserved for smb header */ |
| 1748 | iov[1].iov_base = (char *)write_data + total_written; |
| 1749 | iov[1].iov_len = len; |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1750 | io_parms.pid = pid; |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1751 | io_parms.tcon = tcon; |
| 1752 | io_parms.offset = *offset; |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1753 | io_parms.length = len; |
Steve French | db8b631 | 2014-09-22 05:13:55 -0500 | [diff] [blame] | 1754 | rc = server->ops->sync_write(xid, &open_file->fid, |
| 1755 | &io_parms, &bytes_written, iov, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | } |
| 1757 | if (rc || (bytes_written == 0)) { |
| 1758 | if (total_written) |
| 1759 | break; |
| 1760 | else { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1761 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | return rc; |
| 1763 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1764 | } else { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1765 | spin_lock(&d_inode(dentry)->i_lock); |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1766 | cifs_update_eof(cifsi, *offset, bytes_written); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1767 | spin_unlock(&d_inode(dentry)->i_lock); |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1768 | *offset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | } |
| 1771 | |
Pavel Shilovsky | ba9ad725 | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1772 | cifs_stats_bytes_written(tcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1774 | if (total_written > 0) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1775 | spin_lock(&d_inode(dentry)->i_lock); |
| 1776 | if (*offset > d_inode(dentry)->i_size) |
| 1777 | i_size_write(d_inode(dentry), *offset); |
| 1778 | spin_unlock(&d_inode(dentry)->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1780 | mark_inode_dirty_sync(d_inode(dentry)); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 1781 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | return total_written; |
| 1783 | } |
| 1784 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1785 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
| 1786 | bool fsuid_only) |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1787 | { |
| 1788 | struct cifsFileInfo *open_file = NULL; |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1789 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1790 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1791 | |
| 1792 | /* only filter by fsuid on multiuser mounts */ |
| 1793 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1794 | fsuid_only = false; |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1795 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1796 | spin_lock(&tcon->open_file_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1797 | /* we could simply get the first_list_entry since write-only entries |
| 1798 | are always at the end of the list but since the first entry might |
| 1799 | have a close pending, we go through the whole list */ |
| 1800 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Eric W. Biederman | fef59fd | 2013-02-06 02:23:02 -0800 | [diff] [blame] | 1801 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1802 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1803 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1804 | if (!open_file->invalidHandle) { |
| 1805 | /* found a good file */ |
| 1806 | /* lock it so it will not be closed on us */ |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1807 | cifsFileInfo_get(open_file); |
| 1808 | spin_unlock(&tcon->open_file_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1809 | return open_file; |
| 1810 | } /* else might as well continue, and look for |
| 1811 | another, or simply have the caller reopen it |
| 1812 | again rather than trying to fix this handle */ |
| 1813 | } else /* write only file */ |
| 1814 | break; /* write only files are last so must be done */ |
| 1815 | } |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1816 | spin_unlock(&tcon->open_file_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1817 | return NULL; |
| 1818 | } |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1819 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1820 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
| 1821 | bool fsuid_only) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1822 | { |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1823 | struct cifsFileInfo *open_file, *inv_file = NULL; |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1824 | struct cifs_sb_info *cifs_sb; |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1825 | struct cifs_tcon *tcon; |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1826 | bool any_available = false; |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1827 | int rc; |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1828 | unsigned int refind = 0; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1829 | |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1830 | /* Having a null inode here (because mapping->host was set to zero by |
| 1831 | the VFS or MM) should not happen but we had reports of on oops (due to |
| 1832 | it being zero) during stress testcases so we need to check for it */ |
| 1833 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1834 | if (cifs_inode == NULL) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1835 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1836 | dump_stack(); |
| 1837 | return NULL; |
| 1838 | } |
| 1839 | |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1840 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1841 | tcon = cifs_sb_master_tcon(cifs_sb); |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1842 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1843 | /* only filter by fsuid on multiuser mounts */ |
| 1844 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1845 | fsuid_only = false; |
| 1846 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1847 | spin_lock(&tcon->open_file_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1848 | refind_writable: |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1849 | if (refind > MAX_REOPEN_ATT) { |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1850 | spin_unlock(&tcon->open_file_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1851 | return NULL; |
| 1852 | } |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1853 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1854 | if (!any_available && open_file->pid != current->tgid) |
| 1855 | continue; |
Eric W. Biederman | fef59fd | 2013-02-06 02:23:02 -0800 | [diff] [blame] | 1856 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1857 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1858 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1859 | if (!open_file->invalidHandle) { |
| 1860 | /* found a good writable file */ |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1861 | cifsFileInfo_get(open_file); |
| 1862 | spin_unlock(&tcon->open_file_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1863 | return open_file; |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1864 | } else { |
| 1865 | if (!inv_file) |
| 1866 | inv_file = open_file; |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1867 | } |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1868 | } |
| 1869 | } |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1870 | /* couldn't find useable FH with same pid, try any available */ |
| 1871 | if (!any_available) { |
| 1872 | any_available = true; |
| 1873 | goto refind_writable; |
| 1874 | } |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1875 | |
| 1876 | if (inv_file) { |
| 1877 | any_available = false; |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1878 | cifsFileInfo_get(inv_file); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1879 | } |
| 1880 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1881 | spin_unlock(&tcon->open_file_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1882 | |
| 1883 | if (inv_file) { |
| 1884 | rc = cifs_reopen_file(inv_file, false); |
| 1885 | if (!rc) |
| 1886 | return inv_file; |
| 1887 | else { |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1888 | spin_lock(&tcon->open_file_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1889 | list_move_tail(&inv_file->flist, |
| 1890 | &cifs_inode->openFileList); |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1891 | spin_unlock(&tcon->open_file_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1892 | cifsFileInfo_put(inv_file); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1893 | ++refind; |
David Disseldorp | e1e9bda | 2015-03-13 14:20:29 +0100 | [diff] [blame] | 1894 | inv_file = NULL; |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 1895 | spin_lock(&tcon->open_file_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1896 | goto refind_writable; |
| 1897 | } |
| 1898 | } |
| 1899 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1900 | return NULL; |
| 1901 | } |
| 1902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
| 1904 | { |
| 1905 | struct address_space *mapping = page->mapping; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1906 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | char *write_data; |
| 1908 | int rc = -EFAULT; |
| 1909 | int bytes_written = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | struct inode *inode; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1911 | struct cifsFileInfo *open_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | if (!mapping || !mapping->host) |
| 1914 | return -EFAULT; |
| 1915 | |
| 1916 | inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | |
| 1918 | offset += (loff_t)from; |
| 1919 | write_data = kmap(page); |
| 1920 | write_data += from; |
| 1921 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1922 | if ((to > PAGE_SIZE) || (from > to)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | kunmap(page); |
| 1924 | return -EIO; |
| 1925 | } |
| 1926 | |
| 1927 | /* racing with truncate? */ |
| 1928 | if (offset > mapping->host->i_size) { |
| 1929 | kunmap(page); |
| 1930 | return 0; /* don't care */ |
| 1931 | } |
| 1932 | |
| 1933 | /* check to make sure that we are not extending the file */ |
| 1934 | if (mapping->host->i_size - offset < (loff_t)to) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1935 | to = (unsigned)(mapping->host->i_size - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1937 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1938 | if (open_file) { |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1939 | bytes_written = cifs_write(open_file, open_file->pid, |
| 1940 | write_data, to - from, &offset); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1941 | cifsFileInfo_put(open_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | /* Does mm or vfs already set times? */ |
Deepa Dinamani | c2050a4 | 2016-09-14 07:48:06 -0700 | [diff] [blame] | 1943 | inode->i_atime = inode->i_mtime = current_time(inode); |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1944 | if ((bytes_written > 0) && (offset)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1945 | rc = 0; |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1946 | else if (bytes_written < 0) |
| 1947 | rc = bytes_written; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1948 | } else { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1949 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | rc = -EIO; |
| 1951 | } |
| 1952 | |
| 1953 | kunmap(page); |
| 1954 | return rc; |
| 1955 | } |
| 1956 | |
Pavel Shilovsky | 90ac138 | 2014-06-19 16:11:00 +0400 | [diff] [blame] | 1957 | static struct cifs_writedata * |
| 1958 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, |
| 1959 | pgoff_t end, pgoff_t *index, |
| 1960 | unsigned int *found_pages) |
| 1961 | { |
| 1962 | unsigned int nr_pages; |
| 1963 | struct page **pages; |
| 1964 | struct cifs_writedata *wdata; |
| 1965 | |
| 1966 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
| 1967 | cifs_writev_complete); |
| 1968 | if (!wdata) |
| 1969 | return NULL; |
| 1970 | |
| 1971 | /* |
| 1972 | * find_get_pages_tag seems to return a max of 256 on each |
| 1973 | * iteration, so we must call it several times in order to |
| 1974 | * fill the array or the wsize is effectively limited to |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 1975 | * 256 * PAGE_SIZE. |
Pavel Shilovsky | 90ac138 | 2014-06-19 16:11:00 +0400 | [diff] [blame] | 1976 | */ |
| 1977 | *found_pages = 0; |
| 1978 | pages = wdata->pages; |
| 1979 | do { |
| 1980 | nr_pages = find_get_pages_tag(mapping, index, |
| 1981 | PAGECACHE_TAG_DIRTY, tofind, |
| 1982 | pages); |
| 1983 | *found_pages += nr_pages; |
| 1984 | tofind -= nr_pages; |
| 1985 | pages += nr_pages; |
| 1986 | } while (nr_pages && tofind && *index <= end); |
| 1987 | |
| 1988 | return wdata; |
| 1989 | } |
| 1990 | |
Pavel Shilovsky | 7e48ff8 | 2014-06-19 15:01:03 +0400 | [diff] [blame] | 1991 | static unsigned int |
| 1992 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, |
| 1993 | struct address_space *mapping, |
| 1994 | struct writeback_control *wbc, |
| 1995 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) |
| 1996 | { |
| 1997 | unsigned int nr_pages = 0, i; |
| 1998 | struct page *page; |
| 1999 | |
| 2000 | for (i = 0; i < found_pages; i++) { |
| 2001 | page = wdata->pages[i]; |
| 2002 | /* |
| 2003 | * At this point we hold neither mapping->tree_lock nor |
| 2004 | * lock on the page itself: the page may be truncated or |
| 2005 | * invalidated (changing page->mapping to NULL), or even |
| 2006 | * swizzled back from swapper_space to tmpfs file |
| 2007 | * mapping |
| 2008 | */ |
| 2009 | |
| 2010 | if (nr_pages == 0) |
| 2011 | lock_page(page); |
| 2012 | else if (!trylock_page(page)) |
| 2013 | break; |
| 2014 | |
| 2015 | if (unlikely(page->mapping != mapping)) { |
| 2016 | unlock_page(page); |
| 2017 | break; |
| 2018 | } |
| 2019 | |
| 2020 | if (!wbc->range_cyclic && page->index > end) { |
| 2021 | *done = true; |
| 2022 | unlock_page(page); |
| 2023 | break; |
| 2024 | } |
| 2025 | |
| 2026 | if (*next && (page->index != *next)) { |
| 2027 | /* Not next consecutive page */ |
| 2028 | unlock_page(page); |
| 2029 | break; |
| 2030 | } |
| 2031 | |
| 2032 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 2033 | wait_on_page_writeback(page); |
| 2034 | |
| 2035 | if (PageWriteback(page) || |
| 2036 | !clear_page_dirty_for_io(page)) { |
| 2037 | unlock_page(page); |
| 2038 | break; |
| 2039 | } |
| 2040 | |
| 2041 | /* |
| 2042 | * This actually clears the dirty bit in the radix tree. |
| 2043 | * See cifs_writepage() for more commentary. |
| 2044 | */ |
| 2045 | set_page_writeback(page); |
| 2046 | if (page_offset(page) >= i_size_read(mapping->host)) { |
| 2047 | *done = true; |
| 2048 | unlock_page(page); |
| 2049 | end_page_writeback(page); |
| 2050 | break; |
| 2051 | } |
| 2052 | |
| 2053 | wdata->pages[i] = page; |
| 2054 | *next = page->index + 1; |
| 2055 | ++nr_pages; |
| 2056 | } |
| 2057 | |
| 2058 | /* reset index to refind any pages skipped */ |
| 2059 | if (nr_pages == 0) |
| 2060 | *index = wdata->pages[0]->index + 1; |
| 2061 | |
| 2062 | /* put any pages we aren't going to use */ |
| 2063 | for (i = nr_pages; i < found_pages; i++) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2064 | put_page(wdata->pages[i]); |
Pavel Shilovsky | 7e48ff8 | 2014-06-19 15:01:03 +0400 | [diff] [blame] | 2065 | wdata->pages[i] = NULL; |
| 2066 | } |
| 2067 | |
| 2068 | return nr_pages; |
| 2069 | } |
| 2070 | |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2071 | static int |
| 2072 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, |
| 2073 | struct address_space *mapping, struct writeback_control *wbc) |
| 2074 | { |
| 2075 | int rc = 0; |
| 2076 | struct TCP_Server_Info *server; |
| 2077 | unsigned int i; |
| 2078 | |
| 2079 | wdata->sync_mode = wbc->sync_mode; |
| 2080 | wdata->nr_pages = nr_pages; |
| 2081 | wdata->offset = page_offset(wdata->pages[0]); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2082 | wdata->pagesz = PAGE_SIZE; |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2083 | wdata->tailsz = min(i_size_read(mapping->host) - |
| 2084 | page_offset(wdata->pages[nr_pages - 1]), |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2085 | (loff_t)PAGE_SIZE); |
| 2086 | wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz; |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2087 | |
Pavel Shilovsky | 66231a4 | 2014-06-19 16:15:16 +0400 | [diff] [blame] | 2088 | if (wdata->cfile != NULL) |
| 2089 | cifsFileInfo_put(wdata->cfile); |
| 2090 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), false); |
| 2091 | if (!wdata->cfile) { |
| 2092 | cifs_dbg(VFS, "No writable handles for inode\n"); |
| 2093 | rc = -EBADF; |
| 2094 | } else { |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2095 | wdata->pid = wdata->cfile->pid; |
| 2096 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
| 2097 | rc = server->ops->async_writev(wdata, cifs_writedata_release); |
Pavel Shilovsky | 66231a4 | 2014-06-19 16:15:16 +0400 | [diff] [blame] | 2098 | } |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2099 | |
| 2100 | for (i = 0; i < nr_pages; ++i) |
| 2101 | unlock_page(wdata->pages[i]); |
| 2102 | |
| 2103 | return rc; |
| 2104 | } |
| 2105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | static int cifs_writepages(struct address_space *mapping, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2107 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | { |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2109 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2110 | struct TCP_Server_Info *server; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2111 | bool done = false, scanned = false, range_whole = false; |
| 2112 | pgoff_t end, index; |
| 2113 | struct cifs_writedata *wdata; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2114 | int rc = 0; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 2115 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2116 | /* |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2117 | * If wsize is smaller than the page cache size, default to writing |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2118 | * one page at a time via cifs_writepage |
| 2119 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2120 | if (cifs_sb->wsize < PAGE_SIZE) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2121 | return generic_writepages(mapping, wbc); |
| 2122 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 2123 | if (wbc->range_cyclic) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2124 | index = mapping->writeback_index; /* Start from prev offset */ |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 2125 | end = -1; |
| 2126 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2127 | index = wbc->range_start >> PAGE_SHIFT; |
| 2128 | end = wbc->range_end >> PAGE_SHIFT; |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 2129 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2130 | range_whole = true; |
| 2131 | scanned = true; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2132 | } |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2133 | server = cifs_sb_master_tcon(cifs_sb)->ses->server; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2134 | retry: |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2135 | while (!done && index <= end) { |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2136 | unsigned int i, nr_pages, found_pages, wsize, credits; |
Pavel Shilovsky | 66231a4 | 2014-06-19 16:15:16 +0400 | [diff] [blame] | 2137 | pgoff_t next = 0, tofind, saved_index = index; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2138 | |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2139 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, |
| 2140 | &wsize, &credits); |
| 2141 | if (rc) |
| 2142 | break; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2143 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2144 | tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2145 | |
Pavel Shilovsky | 90ac138 | 2014-06-19 16:11:00 +0400 | [diff] [blame] | 2146 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
| 2147 | &found_pages); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2148 | if (!wdata) { |
| 2149 | rc = -ENOMEM; |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2150 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2151 | break; |
| 2152 | } |
| 2153 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2154 | if (found_pages == 0) { |
| 2155 | kref_put(&wdata->refcount, cifs_writedata_release); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2156 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2157 | break; |
| 2158 | } |
| 2159 | |
Pavel Shilovsky | 7e48ff8 | 2014-06-19 15:01:03 +0400 | [diff] [blame] | 2160 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
| 2161 | end, &index, &next, &done); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2162 | |
| 2163 | /* nothing to write? */ |
| 2164 | if (nr_pages == 0) { |
| 2165 | kref_put(&wdata->refcount, cifs_writedata_release); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2166 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2167 | continue; |
| 2168 | } |
| 2169 | |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2170 | wdata->credits = credits; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2171 | |
Pavel Shilovsky | 619aa48 | 2014-06-19 15:28:37 +0400 | [diff] [blame] | 2172 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 2173 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2174 | /* send failure -- clean up the mess */ |
| 2175 | if (rc != 0) { |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2176 | add_credits_and_wake_if(server, wdata->credits, 0); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2177 | for (i = 0; i < nr_pages; ++i) { |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 2178 | if (rc == -EAGAIN) |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2179 | redirty_page_for_writepage(wbc, |
| 2180 | wdata->pages[i]); |
| 2181 | else |
| 2182 | SetPageError(wdata->pages[i]); |
| 2183 | end_page_writeback(wdata->pages[i]); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2184 | put_page(wdata->pages[i]); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2185 | } |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 2186 | if (rc != -EAGAIN) |
| 2187 | mapping_set_error(mapping, rc); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2188 | } |
| 2189 | kref_put(&wdata->refcount, cifs_writedata_release); |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 2190 | |
Pavel Shilovsky | 66231a4 | 2014-06-19 16:15:16 +0400 | [diff] [blame] | 2191 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
| 2192 | index = saved_index; |
| 2193 | continue; |
| 2194 | } |
| 2195 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2196 | wbc->nr_to_write -= nr_pages; |
| 2197 | if (wbc->nr_to_write <= 0) |
| 2198 | done = true; |
Dave Kleikamp | b066a48 | 2008-11-18 03:49:05 +0000 | [diff] [blame] | 2199 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2200 | index = next; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2201 | } |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2202 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2203 | if (!scanned && !done) { |
| 2204 | /* |
| 2205 | * We hit the last page and there is more work to be done: wrap |
| 2206 | * back to the start of the file |
| 2207 | */ |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2208 | scanned = true; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2209 | index = 0; |
| 2210 | goto retry; |
| 2211 | } |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 2212 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 2213 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2214 | mapping->writeback_index = index; |
| 2215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | return rc; |
| 2217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 2219 | static int |
| 2220 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | { |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 2222 | int rc; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2223 | unsigned int xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2225 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | /* BB add check for wbc flags */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2227 | get_page(page); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2228 | if (!PageUptodate(page)) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 2229 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 2230 | |
| 2231 | /* |
| 2232 | * Set the "writeback" flag, and clear "dirty" in the radix tree. |
| 2233 | * |
| 2234 | * A writepage() implementation always needs to do either this, |
| 2235 | * or re-dirty the page with "redirty_page_for_writepage()" in |
| 2236 | * the case of a failure. |
| 2237 | * |
| 2238 | * Just unlocking the page will cause the radix tree tag-bits |
| 2239 | * to fail to update with the state of the page correctly. |
| 2240 | */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2241 | set_page_writeback(page); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 2242 | retry_write: |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2243 | rc = cifs_partialpagewrite(page, 0, PAGE_SIZE); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 2244 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
| 2245 | goto retry_write; |
| 2246 | else if (rc == -EAGAIN) |
| 2247 | redirty_page_for_writepage(wbc, page); |
| 2248 | else if (rc != 0) |
| 2249 | SetPageError(page); |
| 2250 | else |
| 2251 | SetPageUptodate(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 2252 | end_page_writeback(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2253 | put_page(page); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2254 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | return rc; |
| 2256 | } |
| 2257 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 2258 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
| 2259 | { |
| 2260 | int rc = cifs_writepage_locked(page, wbc); |
| 2261 | unlock_page(page); |
| 2262 | return rc; |
| 2263 | } |
| 2264 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2265 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
| 2266 | loff_t pos, unsigned len, unsigned copied, |
| 2267 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2269 | int rc; |
| 2270 | struct inode *inode = mapping->host; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2271 | struct cifsFileInfo *cfile = file->private_data; |
| 2272 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
| 2273 | __u32 pid; |
| 2274 | |
| 2275 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2276 | pid = cfile->pid; |
| 2277 | else |
| 2278 | pid = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 2280 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2281 | page, pos, copied); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2282 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2283 | if (PageChecked(page)) { |
| 2284 | if (copied == len) |
| 2285 | SetPageUptodate(page); |
| 2286 | ClearPageChecked(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2287 | } else if (!PageUptodate(page) && copied == PAGE_SIZE) |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2288 | SetPageUptodate(page); |
| 2289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | if (!PageUptodate(page)) { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2291 | char *page_data; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2292 | unsigned offset = pos & (PAGE_SIZE - 1); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2293 | unsigned int xid; |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2294 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2295 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | /* this is probably better than directly calling |
| 2297 | partialpage_write since in this function the file handle is |
| 2298 | known which we might as well leverage */ |
| 2299 | /* BB check if anything else missing out of ppw |
| 2300 | such as updating last write time */ |
| 2301 | page_data = kmap(page); |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2302 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2303 | /* if (rc < 0) should we set writebehind rc? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | kunmap(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2305 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2306 | free_xid(xid); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2307 | } else { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2308 | rc = copied; |
| 2309 | pos += copied; |
Pavel Shilovsky | ca8aa29 | 2012-12-21 15:05:47 +0400 | [diff] [blame] | 2310 | set_page_dirty(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | } |
| 2312 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2313 | if (rc > 0) { |
| 2314 | spin_lock(&inode->i_lock); |
| 2315 | if (pos > inode->i_size) |
| 2316 | i_size_write(inode, pos); |
| 2317 | spin_unlock(&inode->i_lock); |
| 2318 | } |
| 2319 | |
| 2320 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2321 | put_page(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | return rc; |
| 2324 | } |
| 2325 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2326 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
| 2327 | int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2329 | unsigned int xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | int rc = 0; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 2331 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 1d8c4c0 | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 2332 | struct TCP_Server_Info *server; |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 2333 | struct cifsFileInfo *smbfile = file->private_data; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2334 | struct inode *inode = file_inode(file); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2335 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2337 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 2338 | if (rc) |
| 2339 | return rc; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2340 | inode_lock(inode); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2341 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2342 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | |
Al Viro | 35c265e | 2014-08-19 20:25:34 -0400 | [diff] [blame] | 2344 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
| 2345 | file, datasync); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 2346 | |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 2347 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 2348 | rc = cifs_zap_mapping(inode); |
Pavel Shilovsky | 6feb989 | 2011-04-07 18:18:11 +0400 | [diff] [blame] | 2349 | if (rc) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 2350 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
Pavel Shilovsky | 6feb989 | 2011-04-07 18:18:11 +0400 | [diff] [blame] | 2351 | rc = 0; /* don't care about it in fsync */ |
| 2352 | } |
| 2353 | } |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2354 | |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2355 | tcon = tlink_tcon(smbfile->tlink); |
Pavel Shilovsky | 1d8c4c0 | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 2356 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
| 2357 | server = tcon->ses->server; |
| 2358 | if (server->ops->flush) |
| 2359 | rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| 2360 | else |
| 2361 | rc = -ENOSYS; |
| 2362 | } |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2363 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2364 | free_xid(xid); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2365 | inode_unlock(inode); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2366 | return rc; |
| 2367 | } |
| 2368 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2369 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2370 | { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2371 | unsigned int xid; |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2372 | int rc = 0; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 2373 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 1d8c4c0 | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 2374 | struct TCP_Server_Info *server; |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2375 | struct cifsFileInfo *smbfile = file->private_data; |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 2376 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2377 | struct inode *inode = file->f_mapping->host; |
| 2378 | |
| 2379 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 2380 | if (rc) |
| 2381 | return rc; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2382 | inode_lock(inode); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2383 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2384 | xid = get_xid(); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2385 | |
Al Viro | 35c265e | 2014-08-19 20:25:34 -0400 | [diff] [blame] | 2386 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
| 2387 | file, datasync); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2388 | |
| 2389 | tcon = tlink_tcon(smbfile->tlink); |
Pavel Shilovsky | 1d8c4c0 | 2012-09-18 16:20:27 -0700 | [diff] [blame] | 2390 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
| 2391 | server = tcon->ses->server; |
| 2392 | if (server->ops->flush) |
| 2393 | rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| 2394 | else |
| 2395 | rc = -ENOSYS; |
| 2396 | } |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 2397 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 2398 | free_xid(xid); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2399 | inode_unlock(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | return rc; |
| 2401 | } |
| 2402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | /* |
| 2404 | * As file closes, flush all cached write data for this inode checking |
| 2405 | * for write behind errors. |
| 2406 | */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 2407 | int cifs_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2409 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | int rc = 0; |
| 2411 | |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2412 | if (file->f_mode & FMODE_WRITE) |
Jeff Layton | d3f1322 | 2010-10-15 15:34:07 -0400 | [diff] [blame] | 2413 | rc = filemap_write_and_wait(inode->i_mapping); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 2414 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 2415 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2416 | |
| 2417 | return rc; |
| 2418 | } |
| 2419 | |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2420 | static int |
| 2421 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) |
| 2422 | { |
| 2423 | int rc = 0; |
| 2424 | unsigned long i; |
| 2425 | |
| 2426 | for (i = 0; i < num_pages; i++) { |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2427 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2428 | if (!pages[i]) { |
| 2429 | /* |
| 2430 | * save number of pages we have already allocated and |
| 2431 | * return with ENOMEM error |
| 2432 | */ |
| 2433 | num_pages = i; |
| 2434 | rc = -ENOMEM; |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2435 | break; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2436 | } |
| 2437 | } |
| 2438 | |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2439 | if (rc) { |
| 2440 | for (i = 0; i < num_pages; i++) |
| 2441 | put_page(pages[i]); |
| 2442 | } |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2443 | return rc; |
| 2444 | } |
| 2445 | |
| 2446 | static inline |
| 2447 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) |
| 2448 | { |
| 2449 | size_t num_pages; |
| 2450 | size_t clen; |
| 2451 | |
| 2452 | clen = min_t(const size_t, len, wsize); |
Jeff Layton | a7103b9 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2453 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2454 | |
| 2455 | if (cur_len) |
| 2456 | *cur_len = clen; |
| 2457 | |
| 2458 | return num_pages; |
| 2459 | } |
| 2460 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2461 | static void |
Steve French | 4a5c80d | 2014-02-07 20:45:12 -0600 | [diff] [blame] | 2462 | cifs_uncached_writedata_release(struct kref *refcount) |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2463 | { |
| 2464 | int i; |
Steve French | 4a5c80d | 2014-02-07 20:45:12 -0600 | [diff] [blame] | 2465 | struct cifs_writedata *wdata = container_of(refcount, |
| 2466 | struct cifs_writedata, refcount); |
| 2467 | |
| 2468 | for (i = 0; i < wdata->nr_pages; i++) |
| 2469 | put_page(wdata->pages[i]); |
| 2470 | cifs_writedata_release(refcount); |
| 2471 | } |
| 2472 | |
| 2473 | static void |
| 2474 | cifs_uncached_writev_complete(struct work_struct *work) |
| 2475 | { |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2476 | struct cifs_writedata *wdata = container_of(work, |
| 2477 | struct cifs_writedata, work); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2478 | struct inode *inode = d_inode(wdata->cfile->dentry); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2479 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| 2480 | |
| 2481 | spin_lock(&inode->i_lock); |
| 2482 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); |
| 2483 | if (cifsi->server_eof > inode->i_size) |
| 2484 | i_size_write(inode, cifsi->server_eof); |
| 2485 | spin_unlock(&inode->i_lock); |
| 2486 | |
| 2487 | complete(&wdata->done); |
| 2488 | |
Steve French | 4a5c80d | 2014-02-07 20:45:12 -0600 | [diff] [blame] | 2489 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2490 | } |
| 2491 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2492 | static int |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2493 | wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from, |
| 2494 | size_t *len, unsigned long *num_pages) |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2495 | { |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2496 | size_t save_len, copied, bytes, cur_len = *len; |
| 2497 | unsigned long i, nr_pages = *num_pages; |
| 2498 | |
| 2499 | save_len = cur_len; |
| 2500 | for (i = 0; i < nr_pages; i++) { |
| 2501 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); |
| 2502 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from); |
| 2503 | cur_len -= copied; |
| 2504 | /* |
| 2505 | * If we didn't copy as much as we expected, then that |
| 2506 | * may mean we trod into an unmapped area. Stop copying |
| 2507 | * at that point. On the next pass through the big |
| 2508 | * loop, we'll likely end up getting a zero-length |
| 2509 | * write and bailing out of it. |
| 2510 | */ |
| 2511 | if (copied < bytes) |
| 2512 | break; |
| 2513 | } |
| 2514 | cur_len = save_len - cur_len; |
| 2515 | *len = cur_len; |
| 2516 | |
| 2517 | /* |
| 2518 | * If we have no data to send, then that probably means that |
| 2519 | * the copy above failed altogether. That's most likely because |
| 2520 | * the address in the iovec was bogus. Return -EFAULT and let |
| 2521 | * the caller free anything we allocated and bail out. |
| 2522 | */ |
| 2523 | if (!cur_len) |
| 2524 | return -EFAULT; |
| 2525 | |
| 2526 | /* |
| 2527 | * i + 1 now represents the number of pages we actually used in |
| 2528 | * the copy phase above. |
| 2529 | */ |
| 2530 | *num_pages = i + 1; |
| 2531 | return 0; |
| 2532 | } |
| 2533 | |
Pavel Shilovsky | 43de94e | 2014-06-20 16:10:52 +0400 | [diff] [blame] | 2534 | static int |
| 2535 | cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, |
| 2536 | struct cifsFileInfo *open_file, |
| 2537 | struct cifs_sb_info *cifs_sb, struct list_head *wdata_list) |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2538 | { |
Pavel Shilovsky | 43de94e | 2014-06-20 16:10:52 +0400 | [diff] [blame] | 2539 | int rc = 0; |
| 2540 | size_t cur_len; |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2541 | unsigned long nr_pages, num_pages, i; |
Pavel Shilovsky | 43de94e | 2014-06-20 16:10:52 +0400 | [diff] [blame] | 2542 | struct cifs_writedata *wdata; |
Al Viro | fc56b98 | 2016-09-21 18:18:23 -0400 | [diff] [blame] | 2543 | struct iov_iter saved_from = *from; |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2544 | loff_t saved_offset = offset; |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2545 | pid_t pid; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2546 | struct TCP_Server_Info *server; |
| 2547 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2548 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2549 | pid = open_file->pid; |
| 2550 | else |
| 2551 | pid = current->tgid; |
| 2552 | |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2553 | server = tlink_tcon(open_file->tlink)->ses->server; |
Pavel Shilovsky | 76429c1 | 2011-01-31 16:03:08 +0300 | [diff] [blame] | 2554 | |
| 2555 | do { |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2556 | unsigned int wsize, credits; |
| 2557 | |
| 2558 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, |
| 2559 | &wsize, &credits); |
| 2560 | if (rc) |
| 2561 | break; |
| 2562 | |
| 2563 | nr_pages = get_numpages(wsize, len, &cur_len); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2564 | wdata = cifs_writedata_alloc(nr_pages, |
| 2565 | cifs_uncached_writev_complete); |
| 2566 | if (!wdata) { |
| 2567 | rc = -ENOMEM; |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2568 | add_credits_and_wake_if(server, credits, 0); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2569 | break; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2570 | } |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2571 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2572 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); |
| 2573 | if (rc) { |
| 2574 | kfree(wdata); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2575 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2576 | break; |
| 2577 | } |
| 2578 | |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2579 | num_pages = nr_pages; |
| 2580 | rc = wdata_fill_from_iovec(wdata, from, &cur_len, &num_pages); |
| 2581 | if (rc) { |
Jeff Layton | 5d81de8 | 2014-02-14 07:20:35 -0500 | [diff] [blame] | 2582 | for (i = 0; i < nr_pages; i++) |
| 2583 | put_page(wdata->pages[i]); |
| 2584 | kfree(wdata); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2585 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | 5d81de8 | 2014-02-14 07:20:35 -0500 | [diff] [blame] | 2586 | break; |
| 2587 | } |
| 2588 | |
| 2589 | /* |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2590 | * Bring nr_pages down to the number of pages we actually used, |
| 2591 | * and free any pages that we didn't use. |
Jeff Layton | 5d81de8 | 2014-02-14 07:20:35 -0500 | [diff] [blame] | 2592 | */ |
Pavel Shilovsky | 66386c0 | 2014-06-20 15:48:40 +0400 | [diff] [blame] | 2593 | for ( ; nr_pages > num_pages; nr_pages--) |
Jeff Layton | 5d81de8 | 2014-02-14 07:20:35 -0500 | [diff] [blame] | 2594 | put_page(wdata->pages[nr_pages - 1]); |
| 2595 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2596 | wdata->sync_mode = WB_SYNC_ALL; |
| 2597 | wdata->nr_pages = nr_pages; |
| 2598 | wdata->offset = (__u64)offset; |
| 2599 | wdata->cfile = cifsFileInfo_get(open_file); |
| 2600 | wdata->pid = pid; |
| 2601 | wdata->bytes = cur_len; |
Jeff Layton | eddb079 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 2602 | wdata->pagesz = PAGE_SIZE; |
| 2603 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2604 | wdata->credits = credits; |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2605 | |
| 2606 | if (!wdata->cfile->invalidHandle || |
Germano Percossi | 730fecb | 2017-04-07 12:29:38 +0100 | [diff] [blame] | 2607 | !(rc = cifs_reopen_file(wdata->cfile, false))) |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2608 | rc = server->ops->async_writev(wdata, |
| 2609 | cifs_uncached_writedata_release); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2610 | if (rc) { |
Pavel Shilovsky | cb7e9ea | 2014-06-05 19:03:27 +0400 | [diff] [blame] | 2611 | add_credits_and_wake_if(server, wdata->credits, 0); |
Steve French | 4a5c80d | 2014-02-07 20:45:12 -0600 | [diff] [blame] | 2612 | kref_put(&wdata->refcount, |
| 2613 | cifs_uncached_writedata_release); |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2614 | if (rc == -EAGAIN) { |
Al Viro | fc56b98 | 2016-09-21 18:18:23 -0400 | [diff] [blame] | 2615 | *from = saved_from; |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2616 | iov_iter_advance(from, offset - saved_offset); |
| 2617 | continue; |
| 2618 | } |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2619 | break; |
| 2620 | } |
| 2621 | |
Pavel Shilovsky | 43de94e | 2014-06-20 16:10:52 +0400 | [diff] [blame] | 2622 | list_add_tail(&wdata->list, wdata_list); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2623 | offset += cur_len; |
| 2624 | len -= cur_len; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2625 | } while (len > 0); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2626 | |
| 2627 | return rc; |
| 2628 | } |
| 2629 | |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2630 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2631 | { |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2632 | struct file *file = iocb->ki_filp; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2633 | ssize_t total_written = 0; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2634 | struct cifsFileInfo *open_file; |
| 2635 | struct cifs_tcon *tcon; |
| 2636 | struct cifs_sb_info *cifs_sb; |
| 2637 | struct cifs_writedata *wdata, *tmp; |
| 2638 | struct list_head wdata_list; |
Al Viro | fc56b98 | 2016-09-21 18:18:23 -0400 | [diff] [blame] | 2639 | struct iov_iter saved_from = *from; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2640 | int rc; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2641 | |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2642 | /* |
| 2643 | * BB - optimize the way when signing is disabled. We can drop this |
| 2644 | * extra memory-to-memory copying and use iovec buffers for constructing |
| 2645 | * write request. |
| 2646 | */ |
| 2647 | |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 2648 | rc = generic_write_checks(iocb, from); |
| 2649 | if (rc <= 0) |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2650 | return rc; |
| 2651 | |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2652 | INIT_LIST_HEAD(&wdata_list); |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 2653 | cifs_sb = CIFS_FILE_SB(file); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2654 | open_file = file->private_data; |
| 2655 | tcon = tlink_tcon(open_file->tlink); |
| 2656 | |
| 2657 | if (!tcon->ses->server->ops->async_writev) |
| 2658 | return -ENOSYS; |
| 2659 | |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 2660 | rc = cifs_write_from_iter(iocb->ki_pos, iov_iter_count(from), from, |
| 2661 | open_file, cifs_sb, &wdata_list); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2662 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2663 | /* |
| 2664 | * If at least one write was successfully sent, then discard any rc |
| 2665 | * value from the later writes. If the other write succeeds, then |
| 2666 | * we'll end up returning whatever was written. If it fails, then |
| 2667 | * we'll get a new rc value from that. |
| 2668 | */ |
| 2669 | if (!list_empty(&wdata_list)) |
| 2670 | rc = 0; |
| 2671 | |
| 2672 | /* |
| 2673 | * Wait for and collect replies for any successful sends in order of |
| 2674 | * increasing offset. Once an error is hit or we get a fatal signal |
| 2675 | * while waiting, then return without waiting for any more replies. |
| 2676 | */ |
| 2677 | restart_loop: |
| 2678 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { |
| 2679 | if (!rc) { |
| 2680 | /* FIXME: freezable too? */ |
| 2681 | rc = wait_for_completion_killable(&wdata->done); |
| 2682 | if (rc) |
| 2683 | rc = -EINTR; |
| 2684 | else if (wdata->result) |
| 2685 | rc = wdata->result; |
| 2686 | else |
| 2687 | total_written += wdata->bytes; |
| 2688 | |
| 2689 | /* resend call if it's a retryable error */ |
| 2690 | if (rc == -EAGAIN) { |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2691 | struct list_head tmp_list; |
Al Viro | fc56b98 | 2016-09-21 18:18:23 -0400 | [diff] [blame] | 2692 | struct iov_iter tmp_from = saved_from; |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2693 | |
| 2694 | INIT_LIST_HEAD(&tmp_list); |
| 2695 | list_del_init(&wdata->list); |
| 2696 | |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2697 | iov_iter_advance(&tmp_from, |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2698 | wdata->offset - iocb->ki_pos); |
Pavel Shilovsky | 6ec0b01 | 2014-06-20 16:30:46 +0400 | [diff] [blame] | 2699 | |
| 2700 | rc = cifs_write_from_iter(wdata->offset, |
| 2701 | wdata->bytes, &tmp_from, |
| 2702 | open_file, cifs_sb, &tmp_list); |
| 2703 | |
| 2704 | list_splice(&tmp_list, &wdata_list); |
| 2705 | |
| 2706 | kref_put(&wdata->refcount, |
| 2707 | cifs_uncached_writedata_release); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2708 | goto restart_loop; |
| 2709 | } |
| 2710 | } |
| 2711 | list_del_init(&wdata->list); |
Steve French | 4a5c80d | 2014-02-07 20:45:12 -0600 | [diff] [blame] | 2712 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2713 | } |
| 2714 | |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2715 | if (unlikely(!total_written)) |
| 2716 | return rc; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2717 | |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2718 | iocb->ki_pos += total_written; |
| 2719 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(file_inode(file))->flags); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2720 | cifs_stats_bytes_written(tcon, total_written); |
Al Viro | e9d1593 | 2015-04-06 22:44:11 -0400 | [diff] [blame] | 2721 | return total_written; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2722 | } |
| 2723 | |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2724 | static ssize_t |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2725 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2726 | { |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2727 | struct file *file = iocb->ki_filp; |
| 2728 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| 2729 | struct inode *inode = file->f_mapping->host; |
| 2730 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
| 2731 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2732 | ssize_t rc; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2733 | |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2734 | /* |
| 2735 | * We need to hold the sem to be sure nobody modifies lock list |
| 2736 | * with a brlock that prevents writing. |
| 2737 | */ |
| 2738 | down_read(&cinode->lock_sem); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2739 | inode_lock(inode); |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2740 | |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 2741 | rc = generic_write_checks(iocb, from); |
| 2742 | if (rc <= 0) |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2743 | goto out; |
| 2744 | |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2745 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2746 | server->vals->exclusive_lock_type, NULL, |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2747 | CIFS_WRITE_OP)) |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2748 | rc = __generic_file_write_iter(iocb, from); |
Al Viro | 5f380c7 | 2015-04-07 11:28:12 -0400 | [diff] [blame] | 2749 | else |
| 2750 | rc = -EACCES; |
| 2751 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2752 | inode_unlock(inode); |
Al Viro | 19dfc1f | 2014-04-03 10:27:17 -0400 | [diff] [blame] | 2753 | |
Christoph Hellwig | e259221 | 2016-04-07 08:52:01 -0700 | [diff] [blame] | 2754 | if (rc > 0) |
| 2755 | rc = generic_write_sync(iocb, rc); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2756 | up_read(&cinode->lock_sem); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2757 | return rc; |
| 2758 | } |
| 2759 | |
| 2760 | ssize_t |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2761 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2762 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2763 | struct inode *inode = file_inode(iocb->ki_filp); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 2764 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
| 2765 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 2766 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) |
| 2767 | iocb->ki_filp->private_data; |
| 2768 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 88cf75a | 2012-12-21 15:07:52 +0400 | [diff] [blame] | 2769 | ssize_t written; |
Pavel Shilovsky | ca8aa29 | 2012-12-21 15:05:47 +0400 | [diff] [blame] | 2770 | |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 2771 | written = cifs_get_writer(cinode); |
| 2772 | if (written) |
| 2773 | return written; |
| 2774 | |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 2775 | if (CIFS_CACHE_WRITE(cinode)) { |
Pavel Shilovsky | 88cf75a | 2012-12-21 15:07:52 +0400 | [diff] [blame] | 2776 | if (cap_unix(tcon->ses) && |
| 2777 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 2778 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2779 | written = generic_file_write_iter(iocb, from); |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 2780 | goto out; |
| 2781 | } |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2782 | written = cifs_writev(iocb, from); |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 2783 | goto out; |
Pavel Shilovsky | c299dd0 | 2012-12-06 22:07:52 +0400 | [diff] [blame] | 2784 | } |
Pavel Shilovsky | ca8aa29 | 2012-12-21 15:05:47 +0400 | [diff] [blame] | 2785 | /* |
| 2786 | * For non-oplocked files in strict cache mode we need to write the data |
| 2787 | * to the server exactly from the pos to pos+len-1 rather than flush all |
| 2788 | * affected pages because it may cause a error with mandatory locks on |
| 2789 | * these pages but not on the region from pos to ppos+len-1. |
| 2790 | */ |
Al Viro | 3dae875 | 2014-04-03 12:05:17 -0400 | [diff] [blame] | 2791 | written = cifs_user_writev(iocb, from); |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 2792 | if (written > 0 && CIFS_CACHE_READ(cinode)) { |
Pavel Shilovsky | 88cf75a | 2012-12-21 15:07:52 +0400 | [diff] [blame] | 2793 | /* |
| 2794 | * Windows 7 server can delay breaking level2 oplock if a write |
| 2795 | * request comes - break it on the client to prevent reading |
| 2796 | * an old data. |
| 2797 | */ |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 2798 | cifs_zap_mapping(inode); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 2799 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
| 2800 | inode); |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 2801 | cinode->oplock = 0; |
Pavel Shilovsky | 88cf75a | 2012-12-21 15:07:52 +0400 | [diff] [blame] | 2802 | } |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 2803 | out: |
| 2804 | cifs_put_writer(cinode); |
Pavel Shilovsky | 88cf75a | 2012-12-21 15:07:52 +0400 | [diff] [blame] | 2805 | return written; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2806 | } |
| 2807 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2808 | static struct cifs_readdata * |
Jeff Layton | f4e49cd | 2012-09-18 16:20:36 -0700 | [diff] [blame] | 2809 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2810 | { |
| 2811 | struct cifs_readdata *rdata; |
Jeff Layton | f4e49cd | 2012-09-18 16:20:36 -0700 | [diff] [blame] | 2812 | |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2813 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
| 2814 | GFP_KERNEL); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2815 | if (rdata != NULL) { |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2816 | kref_init(&rdata->refcount); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2817 | INIT_LIST_HEAD(&rdata->list); |
| 2818 | init_completion(&rdata->done); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2819 | INIT_WORK(&rdata->work, complete); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2820 | } |
Jeff Layton | f4e49cd | 2012-09-18 16:20:36 -0700 | [diff] [blame] | 2821 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2822 | return rdata; |
| 2823 | } |
| 2824 | |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2825 | void |
| 2826 | cifs_readdata_release(struct kref *refcount) |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2827 | { |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2828 | struct cifs_readdata *rdata = container_of(refcount, |
| 2829 | struct cifs_readdata, refcount); |
| 2830 | |
| 2831 | if (rdata->cfile) |
| 2832 | cifsFileInfo_put(rdata->cfile); |
| 2833 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2834 | kfree(rdata); |
| 2835 | } |
| 2836 | |
Jeff Layton | 2a1bb13 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2837 | static int |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2838 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2839 | { |
| 2840 | int rc = 0; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2841 | struct page *page; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2842 | unsigned int i; |
| 2843 | |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2844 | for (i = 0; i < nr_pages; i++) { |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2845 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
| 2846 | if (!page) { |
| 2847 | rc = -ENOMEM; |
| 2848 | break; |
| 2849 | } |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2850 | rdata->pages[i] = page; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2851 | } |
| 2852 | |
| 2853 | if (rc) { |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2854 | for (i = 0; i < nr_pages; i++) { |
| 2855 | put_page(rdata->pages[i]); |
| 2856 | rdata->pages[i] = NULL; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2857 | } |
| 2858 | } |
| 2859 | return rc; |
| 2860 | } |
| 2861 | |
| 2862 | static void |
| 2863 | cifs_uncached_readdata_release(struct kref *refcount) |
| 2864 | { |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2865 | struct cifs_readdata *rdata = container_of(refcount, |
| 2866 | struct cifs_readdata, refcount); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2867 | unsigned int i; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2868 | |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2869 | for (i = 0; i < rdata->nr_pages; i++) { |
| 2870 | put_page(rdata->pages[i]); |
| 2871 | rdata->pages[i] = NULL; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2872 | } |
| 2873 | cifs_readdata_release(refcount); |
| 2874 | } |
| 2875 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2876 | /** |
| 2877 | * cifs_readdata_to_iov - copy data from pages in response to an iovec |
| 2878 | * @rdata: the readdata response with list of pages holding data |
Al Viro | 7f25bba | 2014-02-04 14:07:43 -0500 | [diff] [blame] | 2879 | * @iter: destination for our data |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2880 | * |
| 2881 | * This function copies data from a list of pages in a readdata response into |
| 2882 | * an array of iovecs. It will first calculate where the data should go |
| 2883 | * based on the info in the readdata and then copy the data into that spot. |
| 2884 | */ |
Al Viro | 7f25bba | 2014-02-04 14:07:43 -0500 | [diff] [blame] | 2885 | static int |
| 2886 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2887 | { |
Pavel Shilovsky | 34a54d6 | 2014-07-10 10:03:29 +0400 | [diff] [blame] | 2888 | size_t remaining = rdata->got_bytes; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2889 | unsigned int i; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2890 | |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2891 | for (i = 0; i < rdata->nr_pages; i++) { |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2892 | struct page *page = rdata->pages[i]; |
Geert Uytterhoeven | e686bd8 | 2014-04-13 20:46:21 +0200 | [diff] [blame] | 2893 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
Pavel Shilovsky | c06d74d | 2017-01-19 13:53:15 -0800 | [diff] [blame] | 2894 | size_t written; |
| 2895 | |
| 2896 | if (unlikely(iter->type & ITER_PIPE)) { |
| 2897 | void *addr = kmap_atomic(page); |
| 2898 | |
| 2899 | written = copy_to_iter(addr, copy, iter); |
| 2900 | kunmap_atomic(addr); |
| 2901 | } else |
| 2902 | written = copy_page_to_iter(page, 0, copy, iter); |
Al Viro | 7f25bba | 2014-02-04 14:07:43 -0500 | [diff] [blame] | 2903 | remaining -= written; |
| 2904 | if (written < copy && iov_iter_count(iter) > 0) |
| 2905 | break; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2906 | } |
Al Viro | 7f25bba | 2014-02-04 14:07:43 -0500 | [diff] [blame] | 2907 | return remaining ? -EFAULT : 0; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2908 | } |
| 2909 | |
| 2910 | static void |
| 2911 | cifs_uncached_readv_complete(struct work_struct *work) |
| 2912 | { |
| 2913 | struct cifs_readdata *rdata = container_of(work, |
| 2914 | struct cifs_readdata, work); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2915 | |
| 2916 | complete(&rdata->done); |
| 2917 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
| 2918 | } |
| 2919 | |
| 2920 | static int |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 2921 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
| 2922 | struct cifs_readdata *rdata, unsigned int len) |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2923 | { |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 2924 | int result = 0; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2925 | unsigned int i; |
| 2926 | unsigned int nr_pages = rdata->nr_pages; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2927 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 2928 | rdata->got_bytes = 0; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 2929 | rdata->tailsz = PAGE_SIZE; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2930 | for (i = 0; i < nr_pages; i++) { |
| 2931 | struct page *page = rdata->pages[i]; |
Al Viro | 7133566 | 2016-01-09 19:54:50 -0500 | [diff] [blame] | 2932 | size_t n; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2933 | |
Al Viro | 7133566 | 2016-01-09 19:54:50 -0500 | [diff] [blame] | 2934 | if (len <= 0) { |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2935 | /* no need to hold page hostage */ |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2936 | rdata->pages[i] = NULL; |
| 2937 | rdata->nr_pages--; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2938 | put_page(page); |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 2939 | continue; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2940 | } |
Al Viro | 7133566 | 2016-01-09 19:54:50 -0500 | [diff] [blame] | 2941 | n = len; |
| 2942 | if (len >= PAGE_SIZE) { |
| 2943 | /* enough data to fill the page */ |
| 2944 | n = PAGE_SIZE; |
| 2945 | len -= n; |
| 2946 | } else { |
| 2947 | zero_user(page, len, PAGE_SIZE - len); |
| 2948 | rdata->tailsz = len; |
| 2949 | len = 0; |
| 2950 | } |
| 2951 | result = cifs_read_page_from_socket(server, page, n); |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 2952 | if (result < 0) |
| 2953 | break; |
| 2954 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 2955 | rdata->got_bytes += result; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2956 | } |
| 2957 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 2958 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
| 2959 | rdata->got_bytes : result; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2960 | } |
| 2961 | |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 2962 | static int |
| 2963 | cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, |
| 2964 | struct cifs_sb_info *cifs_sb, struct list_head *rdata_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | { |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 2966 | struct cifs_readdata *rdata; |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 2967 | unsigned int npages, rsize, credits; |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 2968 | size_t cur_len; |
| 2969 | int rc; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2970 | pid_t pid; |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 2971 | struct TCP_Server_Info *server; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2972 | |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 2973 | server = tlink_tcon(open_file->tlink)->ses->server; |
Pavel Shilovsky | fc9c596 | 2012-09-18 16:20:28 -0700 | [diff] [blame] | 2974 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2975 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2976 | pid = open_file->pid; |
| 2977 | else |
| 2978 | pid = current->tgid; |
| 2979 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2980 | do { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 2981 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
| 2982 | &rsize, &credits); |
| 2983 | if (rc) |
| 2984 | break; |
| 2985 | |
| 2986 | cur_len = min_t(const size_t, len, rsize); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2987 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2988 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2989 | /* allocate a readdata struct */ |
| 2990 | rdata = cifs_readdata_alloc(npages, |
| 2991 | cifs_uncached_readv_complete); |
| 2992 | if (!rdata) { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 2993 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2994 | rc = -ENOMEM; |
Jeff Layton | bae9f74 | 2014-04-15 12:48:49 -0400 | [diff] [blame] | 2995 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2996 | } |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2997 | |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 2998 | rc = cifs_read_allocate_pages(rdata, npages); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2999 | if (rc) |
| 3000 | goto error; |
| 3001 | |
| 3002 | rdata->cfile = cifsFileInfo_get(open_file); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3003 | rdata->nr_pages = npages; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3004 | rdata->offset = offset; |
| 3005 | rdata->bytes = cur_len; |
| 3006 | rdata->pid = pid; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3007 | rdata->pagesz = PAGE_SIZE; |
| 3008 | rdata->read_into_pages = cifs_uncached_read_into_pages; |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3009 | rdata->credits = credits; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3010 | |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3011 | if (!rdata->cfile->invalidHandle || |
Germano Percossi | 730fecb | 2017-04-07 12:29:38 +0100 | [diff] [blame] | 3012 | !(rc = cifs_reopen_file(rdata->cfile, true))) |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3013 | rc = server->ops->async_readv(rdata); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3014 | error: |
| 3015 | if (rc) { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3016 | add_credits_and_wake_if(server, rdata->credits, 0); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3017 | kref_put(&rdata->refcount, |
| 3018 | cifs_uncached_readdata_release); |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3019 | if (rc == -EAGAIN) |
| 3020 | continue; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3021 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3022 | } |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3023 | |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 3024 | list_add_tail(&rdata->list, rdata_list); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3025 | offset += cur_len; |
| 3026 | len -= cur_len; |
| 3027 | } while (len > 0); |
| 3028 | |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 3029 | return rc; |
| 3030 | } |
| 3031 | |
| 3032 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) |
| 3033 | { |
| 3034 | struct file *file = iocb->ki_filp; |
| 3035 | ssize_t rc; |
| 3036 | size_t len; |
| 3037 | ssize_t total_read = 0; |
| 3038 | loff_t offset = iocb->ki_pos; |
| 3039 | struct cifs_sb_info *cifs_sb; |
| 3040 | struct cifs_tcon *tcon; |
| 3041 | struct cifsFileInfo *open_file; |
| 3042 | struct cifs_readdata *rdata, *tmp; |
| 3043 | struct list_head rdata_list; |
| 3044 | |
| 3045 | len = iov_iter_count(to); |
| 3046 | if (!len) |
| 3047 | return 0; |
| 3048 | |
| 3049 | INIT_LIST_HEAD(&rdata_list); |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 3050 | cifs_sb = CIFS_FILE_SB(file); |
Pavel Shilovsky | 0ada36b | 2014-06-25 10:42:28 +0400 | [diff] [blame] | 3051 | open_file = file->private_data; |
| 3052 | tcon = tlink_tcon(open_file->tlink); |
| 3053 | |
| 3054 | if (!tcon->ses->server->ops->async_readv) |
| 3055 | return -ENOSYS; |
| 3056 | |
| 3057 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
| 3058 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
| 3059 | |
| 3060 | rc = cifs_send_async_read(offset, len, open_file, cifs_sb, &rdata_list); |
| 3061 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3062 | /* if at least one read request send succeeded, then reset rc */ |
| 3063 | if (!list_empty(&rdata_list)) |
| 3064 | rc = 0; |
| 3065 | |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3066 | len = iov_iter_count(to); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3067 | /* the loop below should proceed in the order of increasing offsets */ |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3068 | again: |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3069 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { |
| 3070 | if (!rc) { |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3071 | /* FIXME: freezable sleep too? */ |
| 3072 | rc = wait_for_completion_killable(&rdata->done); |
| 3073 | if (rc) |
| 3074 | rc = -EINTR; |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3075 | else if (rdata->result == -EAGAIN) { |
Al Viro | 74027f4 | 2014-02-04 13:47:26 -0500 | [diff] [blame] | 3076 | /* resend call if it's a retryable error */ |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3077 | struct list_head tmp_list; |
Pavel Shilovsky | d913ed1 | 2014-07-10 11:31:48 +0400 | [diff] [blame] | 3078 | unsigned int got_bytes = rdata->got_bytes; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3079 | |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3080 | list_del_init(&rdata->list); |
| 3081 | INIT_LIST_HEAD(&tmp_list); |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3082 | |
Pavel Shilovsky | d913ed1 | 2014-07-10 11:31:48 +0400 | [diff] [blame] | 3083 | /* |
| 3084 | * Got a part of data and then reconnect has |
| 3085 | * happened -- fill the buffer and continue |
| 3086 | * reading. |
| 3087 | */ |
| 3088 | if (got_bytes && got_bytes < rdata->bytes) { |
| 3089 | rc = cifs_readdata_to_iov(rdata, to); |
| 3090 | if (rc) { |
| 3091 | kref_put(&rdata->refcount, |
| 3092 | cifs_uncached_readdata_release); |
| 3093 | continue; |
| 3094 | } |
| 3095 | } |
| 3096 | |
| 3097 | rc = cifs_send_async_read( |
| 3098 | rdata->offset + got_bytes, |
| 3099 | rdata->bytes - got_bytes, |
| 3100 | rdata->cfile, cifs_sb, |
| 3101 | &tmp_list); |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3102 | |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3103 | list_splice(&tmp_list, &rdata_list); |
Pavel Shilovsky | 25f4025 | 2014-06-25 10:45:07 +0400 | [diff] [blame] | 3104 | |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3105 | kref_put(&rdata->refcount, |
| 3106 | cifs_uncached_readdata_release); |
| 3107 | goto again; |
| 3108 | } else if (rdata->result) |
| 3109 | rc = rdata->result; |
| 3110 | else |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3111 | rc = cifs_readdata_to_iov(rdata, to); |
Pavel Shilovsky | fb8a3e5 | 2014-07-10 11:50:39 +0400 | [diff] [blame] | 3112 | |
Pavel Shilovsky | 2e8a05d | 2014-07-10 10:21:15 +0400 | [diff] [blame] | 3113 | /* if there was a short read -- discard anything left */ |
| 3114 | if (rdata->got_bytes && rdata->got_bytes < rdata->bytes) |
| 3115 | rc = -ENODATA; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3116 | } |
| 3117 | list_del_init(&rdata->list); |
| 3118 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | } |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3120 | |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3121 | total_read = len - iov_iter_count(to); |
Al Viro | 7f25bba | 2014-02-04 14:07:43 -0500 | [diff] [blame] | 3122 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3123 | cifs_stats_bytes_read(tcon, total_read); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3124 | |
Pavel Shilovsky | 09a4707 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3125 | /* mask nodata case */ |
| 3126 | if (rc == -ENODATA) |
| 3127 | rc = 0; |
| 3128 | |
Al Viro | 0165e81 | 2014-02-04 14:19:48 -0500 | [diff] [blame] | 3129 | if (total_read) { |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3130 | iocb->ki_pos += total_read; |
Al Viro | 0165e81 | 2014-02-04 14:19:48 -0500 | [diff] [blame] | 3131 | return total_read; |
| 3132 | } |
| 3133 | return rc; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3134 | } |
| 3135 | |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3136 | ssize_t |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3137 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3138 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3139 | struct inode *inode = file_inode(iocb->ki_filp); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3140 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
| 3141 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 3142 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) |
| 3143 | iocb->ki_filp->private_data; |
| 3144 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| 3145 | int rc = -EACCES; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3146 | |
| 3147 | /* |
| 3148 | * In strict cache mode we need to read from the server all the time |
| 3149 | * if we don't have level II oplock because the server can delay mtime |
| 3150 | * change - so we can't make a decision about inode invalidating. |
| 3151 | * And we can also fail with pagereading if there are mandatory locks |
| 3152 | * on pages affected by this read but not on the region from pos to |
| 3153 | * pos+len-1. |
| 3154 | */ |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3155 | if (!CIFS_CACHE_READ(cinode)) |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3156 | return cifs_user_readv(iocb, to); |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3157 | |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3158 | if (cap_unix(tcon->ses) && |
| 3159 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 3160 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3161 | return generic_file_read_iter(iocb, to); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3162 | |
| 3163 | /* |
| 3164 | * We need to hold the sem to be sure nobody modifies lock list |
| 3165 | * with a brlock that prevents reading. |
| 3166 | */ |
| 3167 | down_read(&cinode->lock_sem); |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3168 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3169 | tcon->ses->server->vals->shared_lock_type, |
Pavel Shilovsky | 081c041 | 2012-11-27 18:38:53 +0400 | [diff] [blame] | 3170 | NULL, CIFS_READ_OP)) |
Al Viro | e6a7bcb | 2014-04-02 19:53:36 -0400 | [diff] [blame] | 3171 | rc = generic_file_read_iter(iocb, to); |
Pavel Shilovsky | 579f905 | 2012-09-19 06:22:44 -0700 | [diff] [blame] | 3172 | up_read(&cinode->lock_sem); |
| 3173 | return rc; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 3174 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3175 | |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3176 | static ssize_t |
| 3177 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3178 | { |
| 3179 | int rc = -EACCES; |
| 3180 | unsigned int bytes_read = 0; |
| 3181 | unsigned int total_read; |
| 3182 | unsigned int current_read_size; |
Jeff Layton | 5eba8ab | 2011-10-19 15:30:26 -0400 | [diff] [blame] | 3183 | unsigned int rsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3184 | struct cifs_sb_info *cifs_sb; |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 3185 | struct cifs_tcon *tcon; |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3186 | struct TCP_Server_Info *server; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3187 | unsigned int xid; |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3188 | char *cur_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3189 | struct cifsFileInfo *open_file; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3190 | struct cifs_io_parms io_parms; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 3191 | int buf_type = CIFS_NO_BUFFER; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3192 | __u32 pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3193 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3194 | xid = get_xid(); |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 3195 | cifs_sb = CIFS_FILE_SB(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3196 | |
Jeff Layton | 5eba8ab | 2011-10-19 15:30:26 -0400 | [diff] [blame] | 3197 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
| 3198 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); |
| 3199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3200 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3201 | rc = -EBADF; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3202 | free_xid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3203 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3204 | } |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 3205 | open_file = file->private_data; |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 3206 | tcon = tlink_tcon(open_file->tlink); |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3207 | server = tcon->ses->server; |
| 3208 | |
| 3209 | if (!server->ops->sync_read) { |
| 3210 | free_xid(xid); |
| 3211 | return -ENOSYS; |
| 3212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3213 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3214 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 3215 | pid = open_file->pid; |
| 3216 | else |
| 3217 | pid = current->tgid; |
| 3218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3219 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3220 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3221 | |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3222 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
| 3223 | total_read += bytes_read, cur_offset += bytes_read) { |
Pavel Shilovsky | e374d90 | 2014-06-25 16:19:02 +0400 | [diff] [blame] | 3224 | do { |
| 3225 | current_read_size = min_t(uint, read_size - total_read, |
| 3226 | rsize); |
| 3227 | /* |
| 3228 | * For windows me and 9x we do not want to request more |
| 3229 | * than it negotiated since it will refuse the read |
| 3230 | * then. |
| 3231 | */ |
| 3232 | if ((tcon->ses) && !(tcon->ses->capabilities & |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 3233 | tcon->ses->server->vals->cap_large_files)) { |
Pavel Shilovsky | e374d90 | 2014-06-25 16:19:02 +0400 | [diff] [blame] | 3234 | current_read_size = min_t(uint, |
| 3235 | current_read_size, CIFSMaxBufSize); |
| 3236 | } |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 3237 | if (open_file->invalidHandle) { |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 3238 | rc = cifs_reopen_file(open_file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3239 | if (rc != 0) |
| 3240 | break; |
| 3241 | } |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3242 | io_parms.pid = pid; |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 3243 | io_parms.tcon = tcon; |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3244 | io_parms.offset = *offset; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3245 | io_parms.length = current_read_size; |
Steve French | db8b631 | 2014-09-22 05:13:55 -0500 | [diff] [blame] | 3246 | rc = server->ops->sync_read(xid, &open_file->fid, &io_parms, |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3247 | &bytes_read, &cur_offset, |
| 3248 | &buf_type); |
Pavel Shilovsky | e374d90 | 2014-06-25 16:19:02 +0400 | [diff] [blame] | 3249 | } while (rc == -EAGAIN); |
| 3250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3251 | if (rc || (bytes_read == 0)) { |
| 3252 | if (total_read) { |
| 3253 | break; |
| 3254 | } else { |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3255 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3256 | return rc; |
| 3257 | } |
| 3258 | } else { |
Pavel Shilovsky | 29e20f9 | 2012-07-13 13:58:14 +0400 | [diff] [blame] | 3259 | cifs_stats_bytes_read(tcon, total_read); |
Pavel Shilovsky | f9c6e23 | 2012-09-18 16:20:29 -0700 | [diff] [blame] | 3260 | *offset += bytes_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3261 | } |
| 3262 | } |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3263 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3264 | return total_read; |
| 3265 | } |
| 3266 | |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 3267 | /* |
| 3268 | * If the page is mmap'ed into a process' page tables, then we need to make |
| 3269 | * sure that it doesn't change while being written back. |
| 3270 | */ |
| 3271 | static int |
| 3272 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 3273 | { |
| 3274 | struct page *page = vmf->page; |
| 3275 | |
| 3276 | lock_page(page); |
| 3277 | return VM_FAULT_LOCKED; |
| 3278 | } |
| 3279 | |
Kirill A. Shutemov | 7cbea8d | 2015-09-09 15:39:26 -0700 | [diff] [blame] | 3280 | static const struct vm_operations_struct cifs_file_vm_ops = { |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 3281 | .fault = filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 3282 | .map_pages = filemap_map_pages, |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 3283 | .page_mkwrite = cifs_page_mkwrite, |
| 3284 | }; |
| 3285 | |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 3286 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
| 3287 | { |
| 3288 | int rc, xid; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3289 | struct inode *inode = file_inode(file); |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 3290 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3291 | xid = get_xid(); |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 3292 | |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3293 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 3294 | rc = cifs_zap_mapping(inode); |
Pavel Shilovsky | 6feb989 | 2011-04-07 18:18:11 +0400 | [diff] [blame] | 3295 | if (rc) |
| 3296 | return rc; |
| 3297 | } |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 3298 | |
| 3299 | rc = generic_file_mmap(file, vma); |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 3300 | if (rc == 0) |
| 3301 | vma->vm_ops = &cifs_file_vm_ops; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3302 | free_xid(xid); |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 3303 | return rc; |
| 3304 | } |
| 3305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3306 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 3307 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3308 | int rc, xid; |
| 3309 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3310 | xid = get_xid(); |
Jeff Layton | abab095 | 2010-02-12 07:44:18 -0500 | [diff] [blame] | 3311 | rc = cifs_revalidate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3312 | if (rc) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3313 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
| 3314 | rc); |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3315 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3316 | return rc; |
| 3317 | } |
| 3318 | rc = generic_file_mmap(file, vma); |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 3319 | if (rc == 0) |
| 3320 | vma->vm_ops = &cifs_file_vm_ops; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3321 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3322 | return rc; |
| 3323 | } |
| 3324 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3325 | static void |
| 3326 | cifs_readv_complete(struct work_struct *work) |
| 3327 | { |
Pavel Shilovsky | b770ddf | 2014-07-10 11:31:53 +0400 | [diff] [blame] | 3328 | unsigned int i, got_bytes; |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3329 | struct cifs_readdata *rdata = container_of(work, |
| 3330 | struct cifs_readdata, work); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3331 | |
Pavel Shilovsky | b770ddf | 2014-07-10 11:31:53 +0400 | [diff] [blame] | 3332 | got_bytes = rdata->got_bytes; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3333 | for (i = 0; i < rdata->nr_pages; i++) { |
| 3334 | struct page *page = rdata->pages[i]; |
| 3335 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3336 | lru_cache_add_file(page); |
| 3337 | |
Pavel Shilovsky | b770ddf | 2014-07-10 11:31:53 +0400 | [diff] [blame] | 3338 | if (rdata->result == 0 || |
| 3339 | (rdata->result == -EAGAIN && got_bytes)) { |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3340 | flush_dcache_page(page); |
| 3341 | SetPageUptodate(page); |
| 3342 | } |
| 3343 | |
| 3344 | unlock_page(page); |
| 3345 | |
Pavel Shilovsky | b770ddf | 2014-07-10 11:31:53 +0400 | [diff] [blame] | 3346 | if (rdata->result == 0 || |
| 3347 | (rdata->result == -EAGAIN && got_bytes)) |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3348 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
| 3349 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3350 | got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes); |
Pavel Shilovsky | b770ddf | 2014-07-10 11:31:53 +0400 | [diff] [blame] | 3351 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3352 | put_page(page); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3353 | rdata->pages[i] = NULL; |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3354 | } |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3355 | kref_put(&rdata->refcount, cifs_readdata_release); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3356 | } |
| 3357 | |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3358 | static int |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3359 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
| 3360 | struct cifs_readdata *rdata, unsigned int len) |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3361 | { |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 3362 | int result = 0; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3363 | unsigned int i; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3364 | u64 eof; |
| 3365 | pgoff_t eof_index; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3366 | unsigned int nr_pages = rdata->nr_pages; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3367 | |
| 3368 | /* determine the eof that the server (probably) has */ |
| 3369 | eof = CIFS_I(rdata->mapping->host)->server_eof; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3370 | eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0; |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3371 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3372 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 3373 | rdata->got_bytes = 0; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3374 | rdata->tailsz = PAGE_SIZE; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3375 | for (i = 0; i < nr_pages; i++) { |
| 3376 | struct page *page = rdata->pages[i]; |
Linus Torvalds | 442c9ac | 2016-05-18 10:17:56 -0700 | [diff] [blame] | 3377 | size_t n = PAGE_SIZE; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3378 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3379 | if (len >= PAGE_SIZE) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3380 | len -= PAGE_SIZE; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3381 | } else if (len > 0) { |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3382 | /* enough for partial page, fill and zero the rest */ |
Linus Torvalds | 442c9ac | 2016-05-18 10:17:56 -0700 | [diff] [blame] | 3383 | zero_user(page, len, PAGE_SIZE - len); |
Al Viro | 7133566 | 2016-01-09 19:54:50 -0500 | [diff] [blame] | 3384 | n = rdata->tailsz = len; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3385 | len = 0; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3386 | } else if (page->index > eof_index) { |
| 3387 | /* |
| 3388 | * The VFS will not try to do readahead past the |
| 3389 | * i_size, but it's possible that we have outstanding |
| 3390 | * writes with gaps in the middle and the i_size hasn't |
| 3391 | * caught up yet. Populate those with zeroed out pages |
| 3392 | * to prevent the VFS from repeatedly attempting to |
| 3393 | * fill them until the writes are flushed. |
| 3394 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3395 | zero_user(page, 0, PAGE_SIZE); |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3396 | lru_cache_add_file(page); |
| 3397 | flush_dcache_page(page); |
| 3398 | SetPageUptodate(page); |
| 3399 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3400 | put_page(page); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3401 | rdata->pages[i] = NULL; |
| 3402 | rdata->nr_pages--; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3403 | continue; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3404 | } else { |
| 3405 | /* no need to hold page hostage */ |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3406 | lru_cache_add_file(page); |
| 3407 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3408 | put_page(page); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3409 | rdata->pages[i] = NULL; |
| 3410 | rdata->nr_pages--; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3411 | continue; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3412 | } |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3413 | |
Al Viro | 7133566 | 2016-01-09 19:54:50 -0500 | [diff] [blame] | 3414 | result = cifs_read_page_from_socket(server, page, n); |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3415 | if (result < 0) |
| 3416 | break; |
| 3417 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 3418 | rdata->got_bytes += result; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3419 | } |
| 3420 | |
Pavel Shilovsky | b3160ae | 2014-07-10 10:16:25 +0400 | [diff] [blame] | 3421 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
| 3422 | rdata->got_bytes : result; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3423 | } |
| 3424 | |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3425 | static int |
| 3426 | readpages_get_pages(struct address_space *mapping, struct list_head *page_list, |
| 3427 | unsigned int rsize, struct list_head *tmplist, |
| 3428 | unsigned int *nr_pages, loff_t *offset, unsigned int *bytes) |
| 3429 | { |
| 3430 | struct page *page, *tpage; |
| 3431 | unsigned int expected_index; |
| 3432 | int rc; |
Michal Hocko | 8a5c743 | 2016-07-26 15:24:53 -0700 | [diff] [blame] | 3433 | gfp_t gfp = readahead_gfp_mask(mapping); |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3434 | |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3435 | INIT_LIST_HEAD(tmplist); |
| 3436 | |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3437 | page = list_entry(page_list->prev, struct page, lru); |
| 3438 | |
| 3439 | /* |
| 3440 | * Lock the page and put it in the cache. Since no one else |
| 3441 | * should have access to this page, we're safe to simply set |
| 3442 | * PG_locked without checking it first. |
| 3443 | */ |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 3444 | __SetPageLocked(page); |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3445 | rc = add_to_page_cache_locked(page, mapping, |
Michal Hocko | 063d99b | 2015-10-15 15:28:24 -0700 | [diff] [blame] | 3446 | page->index, gfp); |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3447 | |
| 3448 | /* give up if we can't stick it in the cache */ |
| 3449 | if (rc) { |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 3450 | __ClearPageLocked(page); |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3451 | return rc; |
| 3452 | } |
| 3453 | |
| 3454 | /* move first page to the tmplist */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3455 | *offset = (loff_t)page->index << PAGE_SHIFT; |
| 3456 | *bytes = PAGE_SIZE; |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3457 | *nr_pages = 1; |
| 3458 | list_move_tail(&page->lru, tmplist); |
| 3459 | |
| 3460 | /* now try and add more pages onto the request */ |
| 3461 | expected_index = page->index + 1; |
| 3462 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { |
| 3463 | /* discontinuity ? */ |
| 3464 | if (page->index != expected_index) |
| 3465 | break; |
| 3466 | |
| 3467 | /* would this page push the read over the rsize? */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3468 | if (*bytes + PAGE_SIZE > rsize) |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3469 | break; |
| 3470 | |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 3471 | __SetPageLocked(page); |
Michal Hocko | 063d99b | 2015-10-15 15:28:24 -0700 | [diff] [blame] | 3472 | if (add_to_page_cache_locked(page, mapping, page->index, gfp)) { |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 3473 | __ClearPageLocked(page); |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3474 | break; |
| 3475 | } |
| 3476 | list_move_tail(&page->lru, tmplist); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3477 | (*bytes) += PAGE_SIZE; |
Pavel Shilovsky | 387eb92 | 2014-06-24 13:08:54 +0400 | [diff] [blame] | 3478 | expected_index++; |
| 3479 | (*nr_pages)++; |
| 3480 | } |
| 3481 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3482 | } |
| 3483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3484 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
| 3485 | struct list_head *page_list, unsigned num_pages) |
| 3486 | { |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3487 | int rc; |
| 3488 | struct list_head tmplist; |
| 3489 | struct cifsFileInfo *open_file = file->private_data; |
Al Viro | 7119e22 | 2014-10-22 00:25:12 -0400 | [diff] [blame] | 3490 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3491 | struct TCP_Server_Info *server; |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3492 | pid_t pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3493 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3494 | /* |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3495 | * Reads as many pages as possible from fscache. Returns -ENOBUFS |
| 3496 | * immediately if the cookie is negative |
David Howells | 54afa99 | 2013-09-04 17:10:39 +0000 | [diff] [blame] | 3497 | * |
| 3498 | * After this point, every page in the list might have PG_fscache set, |
| 3499 | * so we will need to clean that up off of every page we don't use. |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3500 | */ |
| 3501 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, |
| 3502 | &num_pages); |
| 3503 | if (rc == 0) |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3504 | return rc; |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3505 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 3506 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 3507 | pid = open_file->pid; |
| 3508 | else |
| 3509 | pid = current->tgid; |
| 3510 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3511 | rc = 0; |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3512 | server = tlink_tcon(open_file->tlink)->ses->server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3513 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3514 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
| 3515 | __func__, file, mapping, num_pages); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3516 | |
| 3517 | /* |
| 3518 | * Start with the page at end of list and move it to private |
| 3519 | * list. Do the same with any following pages until we hit |
| 3520 | * the rsize limit, hit an index discontinuity, or run out of |
| 3521 | * pages. Issue the async read and then start the loop again |
| 3522 | * until the list is empty. |
| 3523 | * |
| 3524 | * Note that list order is important. The page_list is in |
| 3525 | * the order of declining indexes. When we put the pages in |
| 3526 | * the rdata->pages, then we want them in increasing order. |
| 3527 | */ |
| 3528 | while (!list_empty(page_list)) { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3529 | unsigned int i, nr_pages, bytes, rsize; |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3530 | loff_t offset; |
| 3531 | struct page *page, *tpage; |
| 3532 | struct cifs_readdata *rdata; |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3533 | unsigned credits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3534 | |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3535 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
| 3536 | &rsize, &credits); |
| 3537 | if (rc) |
| 3538 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3539 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3540 | /* |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3541 | * Give up immediately if rsize is too small to read an entire |
| 3542 | * page. The VFS will fall back to readpage. We should never |
| 3543 | * reach this point however since we set ra_pages to 0 when the |
| 3544 | * rsize is smaller than a cache page. |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3545 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3546 | if (unlikely(rsize < PAGE_SIZE)) { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3547 | add_credits_and_wake_if(server, credits, 0); |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3548 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3549 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3550 | |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3551 | rc = readpages_get_pages(mapping, page_list, rsize, &tmplist, |
| 3552 | &nr_pages, &offset, &bytes); |
| 3553 | if (rc) { |
| 3554 | add_credits_and_wake_if(server, credits, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | break; |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3556 | } |
| 3557 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3558 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3559 | if (!rdata) { |
| 3560 | /* best to give up if we're out of mem */ |
| 3561 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { |
| 3562 | list_del(&page->lru); |
| 3563 | lru_cache_add_file(page); |
| 3564 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3565 | put_page(page); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3566 | } |
| 3567 | rc = -ENOMEM; |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3568 | add_credits_and_wake_if(server, credits, 0); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3569 | break; |
| 3570 | } |
| 3571 | |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3572 | rdata->cfile = cifsFileInfo_get(open_file); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3573 | rdata->mapping = mapping; |
| 3574 | rdata->offset = offset; |
| 3575 | rdata->bytes = bytes; |
| 3576 | rdata->pid = pid; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3577 | rdata->pagesz = PAGE_SIZE; |
Jeff Layton | 8321fec | 2012-09-19 06:22:32 -0700 | [diff] [blame] | 3578 | rdata->read_into_pages = cifs_readpages_read_into_pages; |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3579 | rdata->credits = credits; |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3580 | |
| 3581 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { |
| 3582 | list_del(&page->lru); |
| 3583 | rdata->pages[rdata->nr_pages++] = page; |
| 3584 | } |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3585 | |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3586 | if (!rdata->cfile->invalidHandle || |
Germano Percossi | 730fecb | 2017-04-07 12:29:38 +0100 | [diff] [blame] | 3587 | !(rc = cifs_reopen_file(rdata->cfile, true))) |
Pavel Shilovsky | 69cebd7 | 2014-06-24 13:42:03 +0400 | [diff] [blame] | 3588 | rc = server->ops->async_readv(rdata); |
| 3589 | if (rc) { |
Pavel Shilovsky | bed9da0 | 2014-06-25 11:28:57 +0400 | [diff] [blame] | 3590 | add_credits_and_wake_if(server, rdata->credits, 0); |
Jeff Layton | c5fab6f | 2012-09-19 06:22:30 -0700 | [diff] [blame] | 3591 | for (i = 0; i < rdata->nr_pages; i++) { |
| 3592 | page = rdata->pages[i]; |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3593 | lru_cache_add_file(page); |
| 3594 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3595 | put_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | } |
Pavel Shilovsky | 1209bbd | 2014-10-02 20:13:35 +0400 | [diff] [blame] | 3597 | /* Fallback to the readpage in error/reconnect cases */ |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3598 | kref_put(&rdata->refcount, cifs_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3599 | break; |
| 3600 | } |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3601 | |
| 3602 | kref_put(&rdata->refcount, cifs_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3603 | } |
| 3604 | |
David Howells | 54afa99 | 2013-09-04 17:10:39 +0000 | [diff] [blame] | 3605 | /* Any pages that have been shown to fscache but didn't get added to |
| 3606 | * the pagecache must be uncached before they get returned to the |
| 3607 | * allocator. |
| 3608 | */ |
| 3609 | cifs_fscache_readpages_cancel(mapping->host, page_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | return rc; |
| 3611 | } |
| 3612 | |
Sachin Prabhu | a9e9b7b | 2013-09-13 14:11:56 +0100 | [diff] [blame] | 3613 | /* |
| 3614 | * cifs_readpage_worker must be called with the page pinned |
| 3615 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3616 | static int cifs_readpage_worker(struct file *file, struct page *page, |
| 3617 | loff_t *poffset) |
| 3618 | { |
| 3619 | char *read_data; |
| 3620 | int rc; |
| 3621 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3622 | /* Is the page cached? */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3623 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3624 | if (rc == 0) |
| 3625 | goto read_complete; |
| 3626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3627 | read_data = kmap(page); |
| 3628 | /* for reads over a certain size could initiate async read ahead */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3629 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3630 | rc = cifs_read(file, read_data, PAGE_SIZE, poffset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3632 | if (rc < 0) |
| 3633 | goto io_error; |
| 3634 | else |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3635 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3636 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3637 | file_inode(file)->i_atime = |
Deepa Dinamani | c2050a4 | 2016-09-14 07:48:06 -0700 | [diff] [blame] | 3638 | current_time(file_inode(file)); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3639 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3640 | if (PAGE_SIZE > rc) |
| 3641 | memset(read_data + rc, 0, PAGE_SIZE - rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3642 | |
| 3643 | flush_dcache_page(page); |
| 3644 | SetPageUptodate(page); |
Suresh Jayaraman | 9dc0655 | 2010-07-05 18:13:11 +0530 | [diff] [blame] | 3645 | |
| 3646 | /* send this page to the cache */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3647 | cifs_readpage_to_fscache(file_inode(file), page); |
Suresh Jayaraman | 9dc0655 | 2010-07-05 18:13:11 +0530 | [diff] [blame] | 3648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3649 | rc = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | io_error: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3652 | kunmap(page); |
Sachin Prabhu | 466bd31 | 2013-09-13 14:11:57 +0100 | [diff] [blame] | 3653 | unlock_page(page); |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3654 | |
| 3655 | read_complete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3656 | return rc; |
| 3657 | } |
| 3658 | |
| 3659 | static int cifs_readpage(struct file *file, struct page *page) |
| 3660 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3661 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | int rc = -EACCES; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3663 | unsigned int xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3665 | xid = get_xid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3666 | |
| 3667 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3668 | rc = -EBADF; |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3669 | free_xid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3670 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3671 | } |
| 3672 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3673 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3674 | page, (int)offset, (int)offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3675 | |
| 3676 | rc = cifs_readpage_worker(file, page, &offset); |
| 3677 | |
Pavel Shilovsky | 6d5786a | 2012-06-20 11:21:16 +0400 | [diff] [blame] | 3678 | free_xid(xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3679 | return rc; |
| 3680 | } |
| 3681 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3682 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| 3683 | { |
| 3684 | struct cifsFileInfo *open_file; |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 3685 | struct cifs_tcon *tcon = |
| 3686 | cifs_sb_master_tcon(CIFS_SB(cifs_inode->vfs_inode.i_sb)); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3687 | |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 3688 | spin_lock(&tcon->open_file_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3689 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 3690 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 3691 | spin_unlock(&tcon->open_file_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3692 | return 1; |
| 3693 | } |
| 3694 | } |
Steve French | 3afca26 | 2016-09-22 18:58:16 -0500 | [diff] [blame] | 3695 | spin_unlock(&tcon->open_file_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3696 | return 0; |
| 3697 | } |
| 3698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3699 | /* We do not want to update the file size from server for inodes |
| 3700 | open for write - to avoid races with writepage extending |
| 3701 | the file - in the future we could consider allowing |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3702 | refreshing the inode only on increases in the file size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3703 | but this is tricky to do without racing with writebehind |
| 3704 | page caching in the current Linux kernel design */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3705 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3706 | { |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3707 | if (!cifsInode) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3708 | return true; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 3709 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3710 | if (is_inode_writable(cifsInode)) { |
| 3711 | /* This inode is open for write at least once */ |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3712 | struct cifs_sb_info *cifs_sb; |
| 3713 | |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3714 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 3715 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3716 | /* since no page cache to corrupt on directio |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3717 | we can change size safely */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3718 | return true; |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3719 | } |
| 3720 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3721 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3722 | return true; |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 3723 | |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3724 | return false; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 3725 | } else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3726 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3727 | } |
| 3728 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3729 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
| 3730 | loff_t pos, unsigned len, unsigned flags, |
| 3731 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3732 | { |
Sachin Prabhu | 466bd31 | 2013-09-13 14:11:57 +0100 | [diff] [blame] | 3733 | int oncethru = 0; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3734 | pgoff_t index = pos >> PAGE_SHIFT; |
| 3735 | loff_t offset = pos & (PAGE_SIZE - 1); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3736 | loff_t page_start = pos & PAGE_MASK; |
| 3737 | loff_t i_size; |
| 3738 | struct page *page; |
| 3739 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3740 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3741 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3742 | |
Sachin Prabhu | 466bd31 | 2013-09-13 14:11:57 +0100 | [diff] [blame] | 3743 | start: |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 3744 | page = grab_cache_page_write_begin(mapping, index, flags); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3745 | if (!page) { |
| 3746 | rc = -ENOMEM; |
| 3747 | goto out; |
| 3748 | } |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3749 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3750 | if (PageUptodate(page)) |
| 3751 | goto out; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3752 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3753 | /* |
| 3754 | * If we write a full page it will be up to date, no need to read from |
| 3755 | * the server. If the write is short, we'll end up doing a sync write |
| 3756 | * instead. |
| 3757 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3758 | if (len == PAGE_SIZE) |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3759 | goto out; |
| 3760 | |
| 3761 | /* |
| 3762 | * optimize away the read when we have an oplock, and we're not |
| 3763 | * expecting to use any of the data we'd be reading in. That |
| 3764 | * is, when the page lies beyond the EOF, or straddles the EOF |
| 3765 | * and the write will cover all of the existing data. |
| 3766 | */ |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3767 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3768 | i_size = i_size_read(mapping->host); |
| 3769 | if (page_start >= i_size || |
| 3770 | (offset == 0 && (pos + len) >= i_size)) { |
| 3771 | zero_user_segments(page, 0, offset, |
| 3772 | offset + len, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3773 | PAGE_SIZE); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3774 | /* |
| 3775 | * PageChecked means that the parts of the page |
| 3776 | * to which we're not writing are considered up |
| 3777 | * to date. Once the data is copied to the |
| 3778 | * page, it can be set uptodate. |
| 3779 | */ |
| 3780 | SetPageChecked(page); |
| 3781 | goto out; |
| 3782 | } |
| 3783 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | |
Sachin Prabhu | 466bd31 | 2013-09-13 14:11:57 +0100 | [diff] [blame] | 3785 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3786 | /* |
| 3787 | * might as well read a page, it is fast enough. If we get |
| 3788 | * an error, we don't need to return it. cifs_write_end will |
| 3789 | * do a sync write instead since PG_uptodate isn't set. |
| 3790 | */ |
| 3791 | cifs_readpage_worker(file, page, &page_start); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3792 | put_page(page); |
Sachin Prabhu | 466bd31 | 2013-09-13 14:11:57 +0100 | [diff] [blame] | 3793 | oncethru = 1; |
| 3794 | goto start; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3795 | } else { |
| 3796 | /* we could try using another file handle if there is one - |
| 3797 | but how would we lock it to prevent close of that handle |
| 3798 | racing with this read? In any case |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3799 | this will be written out by write_end so is fine */ |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3800 | } |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3801 | out: |
| 3802 | *pagep = page; |
| 3803 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3804 | } |
| 3805 | |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3806 | static int cifs_release_page(struct page *page, gfp_t gfp) |
| 3807 | { |
| 3808 | if (PagePrivate(page)) |
| 3809 | return 0; |
| 3810 | |
| 3811 | return cifs_fscache_release_page(page, gfp); |
| 3812 | } |
| 3813 | |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 3814 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
| 3815 | unsigned int length) |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3816 | { |
| 3817 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); |
| 3818 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3819 | if (offset == 0 && length == PAGE_SIZE) |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3820 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
| 3821 | } |
| 3822 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3823 | static int cifs_launder_page(struct page *page) |
| 3824 | { |
| 3825 | int rc = 0; |
| 3826 | loff_t range_start = page_offset(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3827 | loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3828 | struct writeback_control wbc = { |
| 3829 | .sync_mode = WB_SYNC_ALL, |
| 3830 | .nr_to_write = 0, |
| 3831 | .range_start = range_start, |
| 3832 | .range_end = range_end, |
| 3833 | }; |
| 3834 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3835 | cifs_dbg(FYI, "Launder page: %p\n", page); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3836 | |
| 3837 | if (clear_page_dirty_for_io(page)) |
| 3838 | rc = cifs_writepage_locked(page, &wbc); |
| 3839 | |
| 3840 | cifs_fscache_invalidate_page(page, page->mapping->host); |
| 3841 | return rc; |
| 3842 | } |
| 3843 | |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 3844 | void cifs_oplock_break(struct work_struct *work) |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3845 | { |
| 3846 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 3847 | oplock_break); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3848 | struct inode *inode = d_inode(cfile->dentry); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3849 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
Pavel Shilovsky | 95a3f2f | 2012-09-18 16:20:33 -0700 | [diff] [blame] | 3850 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 3851 | struct TCP_Server_Info *server = tcon->ses->server; |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 3852 | int rc = 0; |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3853 | |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 3854 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 3855 | TASK_UNINTERRUPTIBLE); |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 3856 | |
| 3857 | server->ops->downgrade_oplock(server, cinode, |
| 3858 | test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags)); |
| 3859 | |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3860 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 3861 | cifs_has_mand_locks(cinode)) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3862 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
| 3863 | inode); |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3864 | cinode->oplock = 0; |
Pavel Shilovsky | 63b7d3a | 2012-12-24 14:41:19 +0400 | [diff] [blame] | 3865 | } |
| 3866 | |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3867 | if (inode && S_ISREG(inode->i_mode)) { |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3868 | if (CIFS_CACHE_READ(cinode)) |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 3869 | break_lease(inode, O_RDONLY); |
Steve French | d54ff73 | 2010-04-27 04:38:15 +0000 | [diff] [blame] | 3870 | else |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 3871 | break_lease(inode, O_WRONLY); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3872 | rc = filemap_fdatawrite(inode->i_mapping); |
Pavel Shilovsky | 18cceb6 | 2013-09-05 13:01:06 +0400 | [diff] [blame] | 3873 | if (!CIFS_CACHE_READ(cinode)) { |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 3874 | rc = filemap_fdatawait(inode->i_mapping); |
| 3875 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 4f73c7d | 2014-04-30 09:31:47 -0400 | [diff] [blame] | 3876 | cifs_zap_mapping(inode); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3877 | } |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3878 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3879 | } |
| 3880 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 3881 | rc = cifs_push_locks(cfile); |
| 3882 | if (rc) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3883 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 3884 | |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3885 | /* |
| 3886 | * releasing stale oplock after recent reconnect of smb session using |
| 3887 | * a now incorrect file handle is not a data integrity issue but do |
| 3888 | * not bother sending an oplock release if session to server still is |
| 3889 | * disconnected since oplock already released by the server |
| 3890 | */ |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 3891 | if (!cfile->oplock_break_cancelled) { |
Pavel Shilovsky | 95a3f2f | 2012-09-18 16:20:33 -0700 | [diff] [blame] | 3892 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
| 3893 | cinode); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 3894 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3895 | } |
Sachin Prabhu | c11f1df | 2014-03-11 16:11:47 +0000 | [diff] [blame] | 3896 | cifs_done_oplock_break(cinode); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3897 | } |
| 3898 | |
Steve French | dca6928 | 2013-11-11 16:42:37 -0600 | [diff] [blame] | 3899 | /* |
| 3900 | * The presence of cifs_direct_io() in the address space ops vector |
| 3901 | * allowes open() O_DIRECT flags which would have failed otherwise. |
| 3902 | * |
| 3903 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests |
| 3904 | * so this method should never be called. |
| 3905 | * |
| 3906 | * Direct IO is not yet supported in the cached mode. |
| 3907 | */ |
| 3908 | static ssize_t |
Christoph Hellwig | c8b8e32 | 2016-04-07 08:51:58 -0700 | [diff] [blame] | 3909 | cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
Steve French | dca6928 | 2013-11-11 16:42:37 -0600 | [diff] [blame] | 3910 | { |
| 3911 | /* |
| 3912 | * FIXME |
| 3913 | * Eventually need to support direct IO for non forcedirectio mounts |
| 3914 | */ |
| 3915 | return -EINVAL; |
| 3916 | } |
| 3917 | |
| 3918 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 3919 | const struct address_space_operations cifs_addr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3920 | .readpage = cifs_readpage, |
| 3921 | .readpages = cifs_readpages, |
| 3922 | .writepage = cifs_writepage, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 3923 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3924 | .write_begin = cifs_write_begin, |
| 3925 | .write_end = cifs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3927 | .releasepage = cifs_release_page, |
Steve French | dca6928 | 2013-11-11 16:42:37 -0600 | [diff] [blame] | 3928 | .direct_IO = cifs_direct_io, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3929 | .invalidatepage = cifs_invalidate_page, |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3930 | .launder_page = cifs_launder_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3931 | }; |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3932 | |
| 3933 | /* |
| 3934 | * cifs_readpages requires the server to support a buffer large enough to |
| 3935 | * contain the header plus one complete page of data. Otherwise, we need |
| 3936 | * to leave cifs_readpages out of the address space operations. |
| 3937 | */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 3938 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3939 | .readpage = cifs_readpage, |
| 3940 | .writepage = cifs_writepage, |
| 3941 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3942 | .write_begin = cifs_write_begin, |
| 3943 | .write_end = cifs_write_end, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3944 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3945 | .releasepage = cifs_release_page, |
| 3946 | .invalidatepage = cifs_invalidate_page, |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3947 | .launder_page = cifs_launder_page, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3948 | }; |