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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | static inline int cifs_convert_flags(unsigned int flags) |
| 47 | { |
| 48 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 49 | return GENERIC_READ; |
| 50 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 51 | return GENERIC_WRITE; |
| 52 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 53 | /* GENERIC_ALL is too much permission to request |
| 54 | can cause unnecessary access denied on create */ |
| 55 | /* return GENERIC_ALL; */ |
| 56 | return (GENERIC_READ | GENERIC_WRITE); |
| 57 | } |
| 58 | |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
| 60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | |
| 61 | FILE_READ_DATA); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 62 | } |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 63 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 65 | { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 66 | u32 posix_flags = 0; |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 67 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 69 | posix_flags = SMB_O_RDONLY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 71 | posix_flags = SMB_O_WRONLY; |
| 72 | else if ((flags & O_ACCMODE) == O_RDWR) |
| 73 | posix_flags = SMB_O_RDWR; |
| 74 | |
| 75 | if (flags & O_CREAT) |
| 76 | posix_flags |= SMB_O_CREAT; |
| 77 | if (flags & O_EXCL) |
| 78 | posix_flags |= SMB_O_EXCL; |
| 79 | if (flags & O_TRUNC) |
| 80 | posix_flags |= SMB_O_TRUNC; |
| 81 | /* be safe and imply O_SYNC for O_DSYNC */ |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 82 | if (flags & O_DSYNC) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 83 | posix_flags |= SMB_O_SYNC; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 84 | if (flags & O_DIRECTORY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 85 | posix_flags |= SMB_O_DIRECTORY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 86 | if (flags & O_NOFOLLOW) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 87 | posix_flags |= SMB_O_NOFOLLOW; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 88 | if (flags & O_DIRECT) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 89 | posix_flags |= SMB_O_DIRECT; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 90 | |
| 91 | return posix_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | static inline int cifs_get_disposition(unsigned int flags) |
| 95 | { |
| 96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 97 | return FILE_CREATE; |
| 98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 99 | return FILE_OVERWRITE_IF; |
| 100 | else if ((flags & O_CREAT) == O_CREAT) |
| 101 | return FILE_OPEN_IF; |
Steve French | 55aa2e0 | 2006-05-30 18:09:31 +0000 | [diff] [blame] | 102 | else if ((flags & O_TRUNC) == O_TRUNC) |
| 103 | return FILE_OVERWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | else |
| 105 | return FILE_OPEN; |
| 106 | } |
| 107 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
| 109 | struct super_block *sb, int mode, unsigned int f_flags, |
| 110 | __u32 *poplock, __u16 *pnetfid, int xid) |
| 111 | { |
| 112 | int rc; |
| 113 | FILE_UNIX_BASIC_INFO *presp_data; |
| 114 | __u32 posix_flags = 0; |
| 115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 116 | struct cifs_fattr fattr; |
| 117 | struct tcon_link *tlink; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 118 | struct cifs_tcon *tcon; |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 119 | |
| 120 | cFYI(1, "posix open %s", full_path); |
| 121 | |
| 122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); |
| 123 | if (presp_data == NULL) |
| 124 | return -ENOMEM; |
| 125 | |
| 126 | tlink = cifs_sb_tlink(cifs_sb); |
| 127 | if (IS_ERR(tlink)) { |
| 128 | rc = PTR_ERR(tlink); |
| 129 | goto posix_open_ret; |
| 130 | } |
| 131 | |
| 132 | tcon = tlink_tcon(tlink); |
| 133 | mode &= ~current_umask(); |
| 134 | |
| 135 | posix_flags = cifs_posix_convert_flags(f_flags); |
| 136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, |
| 137 | poplock, full_path, cifs_sb->local_nls, |
| 138 | cifs_sb->mnt_cifs_flags & |
| 139 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 140 | cifs_put_tlink(tlink); |
| 141 | |
| 142 | if (rc) |
| 143 | goto posix_open_ret; |
| 144 | |
| 145 | if (presp_data->Type == cpu_to_le32(-1)) |
| 146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ |
| 147 | |
| 148 | if (!pinode) |
| 149 | goto posix_open_ret; /* caller does not need info */ |
| 150 | |
| 151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); |
| 152 | |
| 153 | /* get new inode and set it up */ |
| 154 | if (*pinode == NULL) { |
| 155 | cifs_fill_uniqueid(sb, &fattr); |
| 156 | *pinode = cifs_iget(sb, &fattr); |
| 157 | if (!*pinode) { |
| 158 | rc = -ENOMEM; |
| 159 | goto posix_open_ret; |
| 160 | } |
| 161 | } else { |
| 162 | cifs_fattr_to_inode(*pinode, &fattr); |
| 163 | } |
| 164 | |
| 165 | posix_open_ret: |
| 166 | kfree(presp_data); |
| 167 | return rc; |
| 168 | } |
| 169 | |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 170 | static int |
| 171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock, |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 173 | __u16 *pnetfid, int xid) |
| 174 | { |
| 175 | int rc; |
| 176 | int desiredAccess; |
| 177 | int disposition; |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 178 | int create_options = CREATE_NOT_DIR; |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 179 | FILE_ALL_INFO *buf; |
| 180 | |
| 181 | desiredAccess = cifs_convert_flags(f_flags); |
| 182 | |
| 183 | /********************************************************************* |
| 184 | * open flag mapping table: |
| 185 | * |
| 186 | * POSIX Flag CIFS Disposition |
| 187 | * ---------- ---------------- |
| 188 | * O_CREAT FILE_OPEN_IF |
| 189 | * O_CREAT | O_EXCL FILE_CREATE |
| 190 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| 191 | * O_TRUNC FILE_OVERWRITE |
| 192 | * none of the above FILE_OPEN |
| 193 | * |
| 194 | * Note that there is not a direct match between disposition |
| 195 | * FILE_SUPERSEDE (ie create whether or not file exists although |
| 196 | * O_CREAT | O_TRUNC is similar but truncates the existing |
| 197 | * file rather than creating a new file as FILE_SUPERSEDE does |
| 198 | * (which uses the attributes / metadata passed in on open call) |
| 199 | *? |
| 200 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
| 201 | *? and the read write flags match reasonably. O_LARGEFILE |
| 202 | *? is irrelevant because largefile support is always used |
| 203 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| 204 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| 205 | *********************************************************************/ |
| 206 | |
| 207 | disposition = cifs_get_disposition(f_flags); |
| 208 | |
| 209 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
| 210 | |
| 211 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 212 | if (!buf) |
| 213 | return -ENOMEM; |
| 214 | |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 215 | if (backup_cred(cifs_sb)) |
| 216 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 217 | |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 218 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
| 219 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 220 | desiredAccess, create_options, pnetfid, poplock, buf, |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 223 | else |
| 224 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
| 225 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, |
| 226 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 227 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 228 | |
| 229 | if (rc) |
| 230 | goto out; |
| 231 | |
| 232 | if (tcon->unix_ext) |
| 233 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
| 234 | xid); |
| 235 | else |
| 236 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
| 237 | xid, pnetfid); |
| 238 | |
| 239 | out: |
| 240 | kfree(buf); |
| 241 | return rc; |
| 242 | } |
| 243 | |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 244 | struct cifsFileInfo * |
| 245 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, |
| 246 | struct tcon_link *tlink, __u32 oplock) |
| 247 | { |
| 248 | struct dentry *dentry = file->f_path.dentry; |
| 249 | struct inode *inode = dentry->d_inode; |
| 250 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
| 251 | struct cifsFileInfo *pCifsFile; |
| 252 | |
| 253 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| 254 | if (pCifsFile == NULL) |
| 255 | return pCifsFile; |
| 256 | |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 257 | pCifsFile->count = 1; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 258 | pCifsFile->netfid = fileHandle; |
| 259 | pCifsFile->pid = current->tgid; |
| 260 | pCifsFile->uid = current_fsuid(); |
| 261 | pCifsFile->dentry = dget(dentry); |
| 262 | pCifsFile->f_flags = file->f_flags; |
| 263 | pCifsFile->invalidHandle = false; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 264 | pCifsFile->tlink = cifs_get_tlink(tlink); |
| 265 | mutex_init(&pCifsFile->fh_mutex); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 266 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 267 | INIT_LIST_HEAD(&pCifsFile->llist); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 268 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 269 | spin_lock(&cifs_file_list_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 270 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
| 271 | /* if readable file instance put first in list*/ |
| 272 | if (file->f_mode & FMODE_READ) |
| 273 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); |
| 274 | else |
| 275 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 276 | spin_unlock(&cifs_file_list_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 277 | |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 278 | cifs_set_oplock_level(pCifsInode, oplock); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 279 | pCifsInode->can_cache_brlcks = pCifsInode->clientCanCacheAll; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 280 | |
| 281 | file->private_data = pCifsFile; |
| 282 | return pCifsFile; |
| 283 | } |
| 284 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 285 | static void cifs_del_lock_waiters(struct cifsLockInfo *lock); |
| 286 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 287 | /* |
| 288 | * Release a reference on the file private data. This may involve closing |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 289 | * the filehandle out on the server. Must be called without holding |
| 290 | * cifs_file_list_lock. |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 291 | */ |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 292 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
| 293 | { |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 294 | struct inode *inode = cifs_file->dentry->d_inode; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 295 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 296 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
Pavel Shilovsky | 4f8ba8a | 2010-11-21 22:36:12 +0300 | [diff] [blame] | 297 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 298 | struct cifsLockInfo *li, *tmp; |
| 299 | |
| 300 | spin_lock(&cifs_file_list_lock); |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 301 | if (--cifs_file->count > 0) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 302 | spin_unlock(&cifs_file_list_lock); |
| 303 | return; |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 304 | } |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 305 | |
| 306 | /* remove it from the lists */ |
| 307 | list_del(&cifs_file->flist); |
| 308 | list_del(&cifs_file->tlist); |
| 309 | |
| 310 | if (list_empty(&cifsi->openFileList)) { |
| 311 | cFYI(1, "closing last open instance for inode %p", |
| 312 | cifs_file->dentry->d_inode); |
Pavel Shilovsky | 4f8ba8a | 2010-11-21 22:36:12 +0300 | [diff] [blame] | 313 | |
| 314 | /* in strict cache mode we need invalidate mapping on the last |
| 315 | close because it may cause a error when we open this file |
| 316 | again and get at least level II oplock */ |
| 317 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
| 318 | CIFS_I(inode)->invalid_mapping = true; |
| 319 | |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 320 | cifs_set_oplock_level(cifsi, 0); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 321 | } |
| 322 | spin_unlock(&cifs_file_list_lock); |
| 323 | |
Jeff Layton | ad63594 | 2011-07-26 12:20:17 -0400 | [diff] [blame] | 324 | cancel_work_sync(&cifs_file->oplock_break); |
| 325 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 326 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
| 327 | int xid, rc; |
| 328 | |
| 329 | xid = GetXid(); |
| 330 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); |
| 331 | FreeXid(xid); |
| 332 | } |
| 333 | |
| 334 | /* Delete any outstanding lock records. We'll lose them when the file |
| 335 | * is closed anyway. |
| 336 | */ |
Pavel Shilovsky | d59dad2 | 2011-09-22 09:53:59 +0400 | [diff] [blame] | 337 | mutex_lock(&cifsi->lock_mutex); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 338 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 339 | list_del(&li->llist); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 340 | cifs_del_lock_waiters(li); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 341 | kfree(li); |
| 342 | } |
Pavel Shilovsky | d59dad2 | 2011-09-22 09:53:59 +0400 | [diff] [blame] | 343 | mutex_unlock(&cifsi->lock_mutex); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 344 | |
| 345 | cifs_put_tlink(cifs_file->tlink); |
| 346 | dput(cifs_file->dentry); |
| 347 | kfree(cifs_file); |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 348 | } |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | int cifs_open(struct inode *inode, struct file *file) |
| 351 | { |
| 352 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 353 | int xid; |
| 354 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | struct cifs_sb_info *cifs_sb; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 356 | struct cifs_tcon *tcon; |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 357 | struct tcon_link *tlink; |
Jeff Layton | 6ca9f3b | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 358 | struct cifsFileInfo *pCifsFile = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | char *full_path = NULL; |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 360 | bool posix_open_ok = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | __u16 netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | xid = GetXid(); |
| 364 | |
| 365 | cifs_sb = CIFS_SB(inode->i_sb); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 366 | tlink = cifs_sb_tlink(cifs_sb); |
| 367 | if (IS_ERR(tlink)) { |
| 368 | FreeXid(xid); |
| 369 | return PTR_ERR(tlink); |
| 370 | } |
| 371 | tcon = tlink_tcon(tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 373 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (full_path == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 375 | rc = -ENOMEM; |
Jeff Layton | 232341b | 2010-08-05 13:58:38 -0400 | [diff] [blame] | 376 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 379 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
| 380 | inode, file->f_flags, full_path); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 381 | |
Pavel Shilovsky | 10b9b98 | 2012-03-20 12:55:09 +0300 | [diff] [blame] | 382 | if (tcon->ses->server->oplocks) |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 383 | oplock = REQ_OPLOCK; |
| 384 | else |
| 385 | oplock = 0; |
| 386 | |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 387 | if (!tcon->broken_posix_open && tcon->unix_ext && |
| 388 | (tcon->ses->capabilities & CAP_UNIX) && |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 389 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 390 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 391 | /* can not refresh inode info since size could be stale */ |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 392 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
Steve French | fa588e0 | 2010-04-22 19:21:55 +0000 | [diff] [blame] | 393 | cifs_sb->mnt_file_mode /* ignored */, |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 394 | file->f_flags, &oplock, &netfid, xid); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 395 | if (rc == 0) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 396 | cFYI(1, "posix open succeeded"); |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 397 | posix_open_ok = true; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 398 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
| 399 | if (tcon->ses->serverNOS) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 400 | cERROR(1, "server %s of type %s returned" |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 401 | " unexpected error on SMB posix open" |
| 402 | ", disabling posix open support." |
| 403 | " Check if server update available.", |
| 404 | tcon->ses->serverName, |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 405 | tcon->ses->serverNOS); |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 406 | tcon->broken_posix_open = true; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 407 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
| 408 | (rc != -EOPNOTSUPP)) /* path not found or net err */ |
| 409 | goto out; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 410 | /* else fallthrough to retry open the old way on network i/o |
| 411 | or DFS errors */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 412 | } |
| 413 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 414 | if (!posix_open_ok) { |
| 415 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
| 416 | file->f_flags, &oplock, &netfid, xid); |
| 417 | if (rc) |
| 418 | goto out; |
| 419 | } |
Jeff Layton | 47c78b7 | 2010-06-16 13:40:17 -0400 | [diff] [blame] | 420 | |
Jeff Layton | abfe1ee | 2010-10-15 15:33:58 -0400 | [diff] [blame] | 421 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
Jeff Layton | 6ca9f3b | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 422 | if (pCifsFile == NULL) { |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 423 | CIFSSMBClose(xid, tcon, netfid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | rc = -ENOMEM; |
| 425 | goto out; |
| 426 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Suresh Jayaraman | 9451a9a | 2010-07-05 18:12:45 +0530 | [diff] [blame] | 428 | cifs_fscache_set_inode_cookie(inode, file); |
| 429 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 430 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* time to set mode which we can not set earlier due to |
| 432 | problems creating new read-only files */ |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame] | 433 | struct cifs_unix_set_info_args args = { |
| 434 | .mode = inode->i_mode, |
| 435 | .uid = NO_CHANGE_64, |
| 436 | .gid = NO_CHANGE_64, |
| 437 | .ctime = NO_CHANGE_64, |
| 438 | .atime = NO_CHANGE_64, |
| 439 | .mtime = NO_CHANGE_64, |
| 440 | .device = 0, |
| 441 | }; |
Jeff Layton | d44a9fe | 2011-01-07 11:30:29 -0500 | [diff] [blame] | 442 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
| 443 | pCifsFile->pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | kfree(full_path); |
| 448 | FreeXid(xid); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 449 | cifs_put_tlink(tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | return rc; |
| 451 | } |
| 452 | |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 453 | /* Try to reacquire byte range locks that were released when session */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | /* to server was lost */ |
| 455 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
| 456 | { |
| 457 | int rc = 0; |
| 458 | |
| 459 | /* BB list all locks open on this file and relock */ |
| 460 | |
| 461 | return rc; |
| 462 | } |
| 463 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 464 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
| 466 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 467 | int xid; |
| 468 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | struct cifs_sb_info *cifs_sb; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 470 | struct cifs_tcon *tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | struct cifsInodeInfo *pCifsInode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 472 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | char *full_path = NULL; |
| 474 | int desiredAccess; |
| 475 | int disposition = FILE_OPEN; |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 476 | int create_options = CREATE_NOT_DIR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | __u16 netfid; |
| 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | xid = GetXid(); |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 480 | mutex_lock(&pCifsFile->fh_mutex); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 481 | if (!pCifsFile->invalidHandle) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 482 | mutex_unlock(&pCifsFile->fh_mutex); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 483 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 485 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 488 | inode = pCifsFile->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | cifs_sb = CIFS_SB(inode->i_sb); |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 490 | tcon = tlink_tcon(pCifsFile->tlink); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* can not grab rename sem here because various ops, including |
| 493 | those that already have the rename sem can end up causing writepage |
| 494 | to get called and if the server was down that means we end up here, |
| 495 | and we can never tell if the caller already has the rename_sem */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 496 | full_path = build_path_from_dentry(pCifsFile->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | if (full_path == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 498 | rc = -ENOMEM; |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 499 | mutex_unlock(&pCifsFile->fh_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | FreeXid(xid); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 501 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | } |
| 503 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 504 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 505 | inode, pCifsFile->f_flags, full_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Pavel Shilovsky | 10b9b98 | 2012-03-20 12:55:09 +0300 | [diff] [blame] | 507 | if (tcon->ses->server->oplocks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | oplock = REQ_OPLOCK; |
| 509 | else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 510 | oplock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 512 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
| 513 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 514 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 515 | |
| 516 | /* |
| 517 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the |
| 518 | * original open. Must mask them off for a reopen. |
| 519 | */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 520 | unsigned int oflags = pCifsFile->f_flags & |
| 521 | ~(O_CREAT | O_EXCL | O_TRUNC); |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 522 | |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 523 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
Steve French | fa588e0 | 2010-04-22 19:21:55 +0000 | [diff] [blame] | 524 | cifs_sb->mnt_file_mode /* ignored */, |
| 525 | oflags, &oplock, &netfid, xid); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 526 | if (rc == 0) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 527 | cFYI(1, "posix reopen succeeded"); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 528 | goto reopen_success; |
| 529 | } |
| 530 | /* fallthrough to retry open the old way on errors, especially |
| 531 | in the reconnect path it is important to retry hard */ |
| 532 | } |
| 533 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 534 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 535 | |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 536 | if (backup_cred(cifs_sb)) |
| 537 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | /* Can not refresh inode by passing in file_info buf to be returned |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 540 | by SMBOpen and then calling get_inode_info with returned buf |
| 541 | since file might have write behind data that needs to be flushed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | and server version of file size can be stale. If we knew for sure |
| 543 | that inode was not dirty locally we could do this */ |
| 544 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 545 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
Shirish Pargaonkar | 3d3ea8e | 2011-09-26 09:56:44 -0500 | [diff] [blame] | 546 | create_options, &netfid, &oplock, NULL, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 547 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 548 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (rc) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 550 | mutex_unlock(&pCifsFile->fh_mutex); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 551 | cFYI(1, "cifs_open returned 0x%x", rc); |
| 552 | cFYI(1, "oplock: %d", oplock); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 553 | goto reopen_error_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 555 | |
| 556 | reopen_success: |
| 557 | pCifsFile->netfid = netfid; |
| 558 | pCifsFile->invalidHandle = false; |
| 559 | mutex_unlock(&pCifsFile->fh_mutex); |
| 560 | pCifsInode = CIFS_I(inode); |
| 561 | |
| 562 | if (can_flush) { |
| 563 | rc = filemap_write_and_wait(inode->i_mapping); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 564 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 565 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 566 | if (tcon->unix_ext) |
| 567 | rc = cifs_get_inode_info_unix(&inode, |
| 568 | full_path, inode->i_sb, xid); |
| 569 | else |
| 570 | rc = cifs_get_inode_info(&inode, |
| 571 | full_path, NULL, inode->i_sb, |
| 572 | xid, NULL); |
| 573 | } /* else we are writing out data to server already |
| 574 | and could deadlock if we tried to flush data, and |
| 575 | since we do not know if we have data that would |
| 576 | invalidate the current end of file on the server |
| 577 | we can not go to the server to get the new inod |
| 578 | info */ |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 579 | |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 580 | cifs_set_oplock_level(pCifsInode, oplock); |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 581 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 582 | cifs_relock_file(pCifsFile); |
| 583 | |
| 584 | reopen_error_exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | kfree(full_path); |
| 586 | FreeXid(xid); |
| 587 | return rc; |
| 588 | } |
| 589 | |
| 590 | int cifs_close(struct inode *inode, struct file *file) |
| 591 | { |
Jeff Layton | 7797069 | 2011-04-05 16:23:47 -0700 | [diff] [blame] | 592 | if (file->private_data != NULL) { |
| 593 | cifsFileInfo_put(file->private_data); |
| 594 | file->private_data = NULL; |
| 595 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 597 | /* return code from the ->release op is always ignored */ |
| 598 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | int cifs_closedir(struct inode *inode, struct file *file) |
| 602 | { |
| 603 | int rc = 0; |
| 604 | int xid; |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 605 | struct cifsFileInfo *pCFileStruct = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | char *ptmp; |
| 607 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 608 | cFYI(1, "Closedir inode = 0x%p", inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | xid = GetXid(); |
| 611 | |
| 612 | if (pCFileStruct) { |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 613 | struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 615 | cFYI(1, "Freeing private data in close dir"); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 616 | spin_lock(&cifs_file_list_lock); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 617 | if (!pCFileStruct->srch_inf.endOfSearch && |
| 618 | !pCFileStruct->invalidHandle) { |
| 619 | pCFileStruct->invalidHandle = true; |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 620 | spin_unlock(&cifs_file_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 622 | cFYI(1, "Closing uncompleted readdir with rc %d", |
| 623 | rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | /* not much we can do if it fails anyway, ignore rc */ |
| 625 | rc = 0; |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 626 | } else |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 627 | spin_unlock(&cifs_file_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
| 629 | if (ptmp) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 630 | cFYI(1, "closedir free smb buf in srch struct"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 632 | if (pCFileStruct->srch_inf.smallBuf) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 633 | cifs_small_buf_release(ptmp); |
| 634 | else |
| 635 | cifs_buf_release(ptmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | } |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 637 | cifs_put_tlink(pCFileStruct->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | kfree(file->private_data); |
| 639 | file->private_data = NULL; |
| 640 | } |
| 641 | /* BB can we lock the filestruct while this is going on? */ |
| 642 | FreeXid(xid); |
| 643 | return rc; |
| 644 | } |
| 645 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 646 | static struct cifsLockInfo * |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 647 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 648 | { |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 649 | struct cifsLockInfo *lock = |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 650 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 651 | if (!lock) |
| 652 | return lock; |
| 653 | lock->offset = offset; |
| 654 | lock->length = length; |
| 655 | lock->type = type; |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 656 | lock->pid = current->tgid; |
| 657 | INIT_LIST_HEAD(&lock->blist); |
| 658 | init_waitqueue_head(&lock->block_q); |
| 659 | return lock; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | static void |
| 663 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
| 664 | { |
| 665 | struct cifsLockInfo *li, *tmp; |
| 666 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { |
| 667 | list_del_init(&li->blist); |
| 668 | wake_up(&li->block_q); |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | static bool |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 673 | cifs_find_fid_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 674 | __u64 length, __u8 type, struct cifsFileInfo *cur, |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 675 | struct cifsLockInfo **conf_lock) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 676 | { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 677 | struct cifsLockInfo *li; |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 678 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 679 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 680 | list_for_each_entry(li, &cfile->llist, llist) { |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 681 | if (offset + length <= li->offset || |
| 682 | offset >= li->offset + li->length) |
| 683 | continue; |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 684 | else if ((type & server->vals->shared_lock_type) && |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 685 | ((server->ops->compare_fids(cur, cfile) && |
| 686 | current->tgid == li->pid) || type == li->type)) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 687 | continue; |
| 688 | else { |
| 689 | *conf_lock = li; |
| 690 | return true; |
| 691 | } |
| 692 | } |
| 693 | return false; |
| 694 | } |
| 695 | |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 696 | static bool |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 697 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
| 698 | __u8 type, struct cifsLockInfo **conf_lock) |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 699 | { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 700 | bool rc = false; |
| 701 | struct cifsFileInfo *fid, *tmp; |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 702 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 703 | |
| 704 | spin_lock(&cifs_file_list_lock); |
| 705 | list_for_each_entry_safe(fid, tmp, &cinode->openFileList, flist) { |
| 706 | rc = cifs_find_fid_lock_conflict(fid, offset, length, type, |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 707 | cfile, conf_lock); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 708 | if (rc) |
| 709 | break; |
| 710 | } |
| 711 | spin_unlock(&cifs_file_list_lock); |
| 712 | |
| 713 | return rc; |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 714 | } |
| 715 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 716 | /* |
| 717 | * Check if there is another lock that prevents us to set the lock (mandatory |
| 718 | * style). If such a lock exists, update the flock structure with its |
| 719 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| 720 | * or leave it the same if we can't. Returns 0 if we don't need to request to |
| 721 | * the server or 1 otherwise. |
| 722 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 723 | static int |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 724 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
| 725 | __u8 type, struct file_lock *flock) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 726 | { |
| 727 | int rc = 0; |
| 728 | struct cifsLockInfo *conf_lock; |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 729 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 730 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 731 | bool exist; |
| 732 | |
| 733 | mutex_lock(&cinode->lock_mutex); |
| 734 | |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 735 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
| 736 | &conf_lock); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 737 | if (exist) { |
| 738 | flock->fl_start = conf_lock->offset; |
| 739 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; |
| 740 | flock->fl_pid = conf_lock->pid; |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 741 | if (conf_lock->type & server->vals->shared_lock_type) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 742 | flock->fl_type = F_RDLCK; |
| 743 | else |
| 744 | flock->fl_type = F_WRLCK; |
| 745 | } else if (!cinode->can_cache_brlcks) |
| 746 | rc = 1; |
| 747 | else |
| 748 | flock->fl_type = F_UNLCK; |
| 749 | |
| 750 | mutex_unlock(&cinode->lock_mutex); |
| 751 | return rc; |
| 752 | } |
| 753 | |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 754 | static void |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 755 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 756 | { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 757 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
Pavel Shilovsky | d59dad2 | 2011-09-22 09:53:59 +0400 | [diff] [blame] | 758 | mutex_lock(&cinode->lock_mutex); |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 759 | list_add_tail(&lock->llist, &cfile->llist); |
Pavel Shilovsky | d59dad2 | 2011-09-22 09:53:59 +0400 | [diff] [blame] | 760 | mutex_unlock(&cinode->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 761 | } |
| 762 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 763 | /* |
| 764 | * Set the byte-range lock (mandatory style). Returns: |
| 765 | * 1) 0, if we set the lock and don't need to request to the server; |
| 766 | * 2) 1, if no locks prevent us but we need to request to the server; |
| 767 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. |
| 768 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 769 | static int |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 770 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 771 | bool wait) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 772 | { |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 773 | struct cifsLockInfo *conf_lock; |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 774 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 775 | bool exist; |
| 776 | int rc = 0; |
| 777 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 778 | try_again: |
| 779 | exist = false; |
| 780 | mutex_lock(&cinode->lock_mutex); |
| 781 | |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 782 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
| 783 | lock->type, &conf_lock); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 784 | if (!exist && cinode->can_cache_brlcks) { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 785 | list_add_tail(&lock->llist, &cfile->llist); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 786 | mutex_unlock(&cinode->lock_mutex); |
| 787 | return rc; |
| 788 | } |
| 789 | |
| 790 | if (!exist) |
| 791 | rc = 1; |
| 792 | else if (!wait) |
| 793 | rc = -EACCES; |
| 794 | else { |
| 795 | list_add_tail(&lock->blist, &conf_lock->blist); |
| 796 | mutex_unlock(&cinode->lock_mutex); |
| 797 | rc = wait_event_interruptible(lock->block_q, |
| 798 | (lock->blist.prev == &lock->blist) && |
| 799 | (lock->blist.next == &lock->blist)); |
| 800 | if (!rc) |
| 801 | goto try_again; |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 802 | mutex_lock(&cinode->lock_mutex); |
| 803 | list_del_init(&lock->blist); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 804 | } |
| 805 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 806 | mutex_unlock(&cinode->lock_mutex); |
| 807 | return rc; |
| 808 | } |
| 809 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 810 | /* |
| 811 | * Check if there is another lock that prevents us to set the lock (posix |
| 812 | * style). If such a lock exists, update the flock structure with its |
| 813 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| 814 | * or leave it the same if we can't. Returns 0 if we don't need to request to |
| 815 | * the server or 1 otherwise. |
| 816 | */ |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 817 | static int |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 818 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
| 819 | { |
| 820 | int rc = 0; |
| 821 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); |
| 822 | unsigned char saved_type = flock->fl_type; |
| 823 | |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 824 | if ((flock->fl_flags & FL_POSIX) == 0) |
| 825 | return 1; |
| 826 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 827 | mutex_lock(&cinode->lock_mutex); |
| 828 | posix_test_lock(file, flock); |
| 829 | |
| 830 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { |
| 831 | flock->fl_type = saved_type; |
| 832 | rc = 1; |
| 833 | } |
| 834 | |
| 835 | mutex_unlock(&cinode->lock_mutex); |
| 836 | return rc; |
| 837 | } |
| 838 | |
Pavel Shilovsky | 9a5101c | 2011-11-07 16:11:24 +0300 | [diff] [blame] | 839 | /* |
| 840 | * Set the byte-range lock (posix style). Returns: |
| 841 | * 1) 0, if we set the lock and don't need to request to the server; |
| 842 | * 2) 1, if we need to request to the server; |
| 843 | * 3) <0, if the error occurs while setting the lock. |
| 844 | */ |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 845 | static int |
| 846 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) |
| 847 | { |
| 848 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 849 | int rc = 1; |
| 850 | |
| 851 | if ((flock->fl_flags & FL_POSIX) == 0) |
| 852 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 853 | |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 854 | try_again: |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 855 | mutex_lock(&cinode->lock_mutex); |
| 856 | if (!cinode->can_cache_brlcks) { |
| 857 | mutex_unlock(&cinode->lock_mutex); |
Pavel Shilovsky | 5079276 | 2011-10-29 17:17:57 +0400 | [diff] [blame] | 858 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 859 | } |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 860 | |
| 861 | rc = posix_lock_file(file, flock, NULL); |
Steve French | 9ebb389 | 2012-04-01 13:52:54 -0500 | [diff] [blame] | 862 | mutex_unlock(&cinode->lock_mutex); |
Pavel Shilovsky | 66189be | 2012-03-28 21:56:19 +0400 | [diff] [blame] | 863 | if (rc == FILE_LOCK_DEFERRED) { |
| 864 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); |
| 865 | if (!rc) |
| 866 | goto try_again; |
| 867 | locks_delete_block(flock); |
| 868 | } |
Steve French | 9ebb389 | 2012-04-01 13:52:54 -0500 | [diff] [blame] | 869 | return rc; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | static int |
| 873 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 874 | { |
| 875 | int xid, rc = 0, stored_rc; |
| 876 | struct cifsLockInfo *li, *tmp; |
| 877 | struct cifs_tcon *tcon; |
| 878 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 879 | unsigned int num, max_num, max_buf; |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 880 | LOCKING_ANDX_RANGE *buf, *cur; |
| 881 | int types[] = {LOCKING_ANDX_LARGE_FILES, |
| 882 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; |
| 883 | int i; |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 884 | |
| 885 | xid = GetXid(); |
| 886 | tcon = tlink_tcon(cfile->tlink); |
| 887 | |
| 888 | mutex_lock(&cinode->lock_mutex); |
| 889 | if (!cinode->can_cache_brlcks) { |
| 890 | mutex_unlock(&cinode->lock_mutex); |
| 891 | FreeXid(xid); |
| 892 | return rc; |
| 893 | } |
| 894 | |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 895 | /* |
| 896 | * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| 897 | * and check it for zero before using. |
| 898 | */ |
| 899 | max_buf = tcon->ses->server->maxBuf; |
| 900 | if (!max_buf) { |
| 901 | mutex_unlock(&cinode->lock_mutex); |
| 902 | FreeXid(xid); |
| 903 | return -EINVAL; |
| 904 | } |
| 905 | |
| 906 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
| 907 | sizeof(LOCKING_ANDX_RANGE); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 908 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
| 909 | if (!buf) { |
| 910 | mutex_unlock(&cinode->lock_mutex); |
| 911 | FreeXid(xid); |
| 912 | return rc; |
| 913 | } |
| 914 | |
| 915 | for (i = 0; i < 2; i++) { |
| 916 | cur = buf; |
| 917 | num = 0; |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 918 | list_for_each_entry_safe(li, tmp, &cfile->llist, llist) { |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 919 | if (li->type != types[i]) |
| 920 | continue; |
| 921 | cur->Pid = cpu_to_le16(li->pid); |
| 922 | cur->LengthLow = cpu_to_le32((u32)li->length); |
| 923 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| 924 | cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| 925 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| 926 | if (++num == max_num) { |
| 927 | stored_rc = cifs_lockv(xid, tcon, cfile->netfid, |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 928 | (__u8)li->type, 0, num, |
| 929 | buf); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 930 | if (stored_rc) |
| 931 | rc = stored_rc; |
| 932 | cur = buf; |
| 933 | num = 0; |
| 934 | } else |
| 935 | cur++; |
| 936 | } |
| 937 | |
| 938 | if (num) { |
| 939 | stored_rc = cifs_lockv(xid, tcon, cfile->netfid, |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 940 | (__u8)types[i], 0, num, buf); |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 941 | if (stored_rc) |
| 942 | rc = stored_rc; |
| 943 | } |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | cinode->can_cache_brlcks = false; |
| 947 | mutex_unlock(&cinode->lock_mutex); |
| 948 | |
Pavel Shilovsky | 32b9aaf | 2011-10-22 15:33:32 +0400 | [diff] [blame] | 949 | kfree(buf); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 950 | FreeXid(xid); |
| 951 | return rc; |
| 952 | } |
| 953 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 954 | /* copied from fs/locks.c with a name change */ |
| 955 | #define cifs_for_each_lock(inode, lockp) \ |
| 956 | for (lockp = &inode->i_flock; *lockp != NULL; \ |
| 957 | lockp = &(*lockp)->fl_next) |
| 958 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 959 | struct lock_to_push { |
| 960 | struct list_head llist; |
| 961 | __u64 offset; |
| 962 | __u64 length; |
| 963 | __u32 pid; |
| 964 | __u16 netfid; |
| 965 | __u8 type; |
| 966 | }; |
| 967 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 968 | static int |
| 969 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
| 970 | { |
| 971 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
| 972 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| 973 | struct file_lock *flock, **before; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 974 | unsigned int count = 0, i = 0; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 975 | int rc = 0, xid, type; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 976 | struct list_head locks_to_send, *el; |
| 977 | struct lock_to_push *lck, *tmp; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 978 | __u64 length; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 979 | |
| 980 | xid = GetXid(); |
| 981 | |
| 982 | mutex_lock(&cinode->lock_mutex); |
| 983 | if (!cinode->can_cache_brlcks) { |
| 984 | mutex_unlock(&cinode->lock_mutex); |
| 985 | FreeXid(xid); |
| 986 | return rc; |
| 987 | } |
| 988 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 989 | lock_flocks(); |
| 990 | cifs_for_each_lock(cfile->dentry->d_inode, before) { |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 991 | if ((*before)->fl_flags & FL_POSIX) |
| 992 | count++; |
| 993 | } |
| 994 | unlock_flocks(); |
| 995 | |
| 996 | INIT_LIST_HEAD(&locks_to_send); |
| 997 | |
| 998 | /* |
Pavel Shilovsky | ce85852 | 2012-03-17 09:46:55 +0300 | [diff] [blame] | 999 | * Allocating count locks is enough because no FL_POSIX locks can be |
| 1000 | * added to the list while we are holding cinode->lock_mutex that |
| 1001 | * protects locking operations of this inode. |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1002 | */ |
| 1003 | for (; i < count; i++) { |
| 1004 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
| 1005 | if (!lck) { |
| 1006 | rc = -ENOMEM; |
| 1007 | goto err_out; |
| 1008 | } |
| 1009 | list_add_tail(&lck->llist, &locks_to_send); |
| 1010 | } |
| 1011 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1012 | el = locks_to_send.next; |
| 1013 | lock_flocks(); |
| 1014 | cifs_for_each_lock(cfile->dentry->d_inode, before) { |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1015 | flock = *before; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1016 | if ((flock->fl_flags & FL_POSIX) == 0) |
| 1017 | continue; |
Pavel Shilovsky | ce85852 | 2012-03-17 09:46:55 +0300 | [diff] [blame] | 1018 | if (el == &locks_to_send) { |
| 1019 | /* |
| 1020 | * The list ended. We don't have enough allocated |
| 1021 | * structures - something is really wrong. |
| 1022 | */ |
| 1023 | cERROR(1, "Can't push all brlocks!"); |
| 1024 | break; |
| 1025 | } |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1026 | length = 1 + flock->fl_end - flock->fl_start; |
| 1027 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) |
| 1028 | type = CIFS_RDLCK; |
| 1029 | else |
| 1030 | type = CIFS_WRLCK; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1031 | lck = list_entry(el, struct lock_to_push, llist); |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1032 | lck->pid = flock->fl_pid; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1033 | lck->netfid = cfile->netfid; |
| 1034 | lck->length = length; |
| 1035 | lck->type = type; |
| 1036 | lck->offset = flock->fl_start; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1037 | el = el->next; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1038 | } |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1039 | unlock_flocks(); |
| 1040 | |
| 1041 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1042 | int stored_rc; |
| 1043 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1044 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
Jeff Layton | c5fd363 | 2012-07-23 13:28:37 -0400 | [diff] [blame] | 1045 | lck->offset, lck->length, NULL, |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1046 | lck->type, 0); |
| 1047 | if (stored_rc) |
| 1048 | rc = stored_rc; |
| 1049 | list_del(&lck->llist); |
| 1050 | kfree(lck); |
| 1051 | } |
| 1052 | |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1053 | out: |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1054 | cinode->can_cache_brlcks = false; |
| 1055 | mutex_unlock(&cinode->lock_mutex); |
| 1056 | |
| 1057 | FreeXid(xid); |
| 1058 | return rc; |
Pavel Shilovsky | d575146 | 2012-03-05 09:39:20 +0300 | [diff] [blame] | 1059 | err_out: |
| 1060 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
| 1061 | list_del(&lck->llist); |
| 1062 | kfree(lck); |
| 1063 | } |
| 1064 | goto out; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | static int |
| 1068 | cifs_push_locks(struct cifsFileInfo *cfile) |
| 1069 | { |
| 1070 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
| 1071 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| 1072 | |
| 1073 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 1074 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 1075 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| 1076 | return cifs_push_posix_locks(cfile); |
| 1077 | |
| 1078 | return cifs_push_mandatory_locks(cfile); |
| 1079 | } |
| 1080 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1081 | static void |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1082 | 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] | 1083 | bool *wait_flag, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | { |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1085 | if (flock->fl_flags & FL_POSIX) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1086 | cFYI(1, "Posix"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1087 | if (flock->fl_flags & FL_FLOCK) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1088 | cFYI(1, "Flock"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1089 | if (flock->fl_flags & FL_SLEEP) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1090 | cFYI(1, "Blocking lock"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1091 | *wait_flag = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1093 | if (flock->fl_flags & FL_ACCESS) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1094 | cFYI(1, "Process suspended by mandatory locking - " |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1095 | "not implemented yet"); |
| 1096 | if (flock->fl_flags & FL_LEASE) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1097 | cFYI(1, "Lease on file - not implemented yet"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1098 | if (flock->fl_flags & |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1100 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1102 | *type = server->vals->large_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1103 | if (flock->fl_type == F_WRLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1104 | cFYI(1, "F_WRLCK "); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1105 | *type |= server->vals->exclusive_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1106 | *lock = 1; |
| 1107 | } else if (flock->fl_type == F_UNLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1108 | cFYI(1, "F_UNLCK"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1109 | *type |= server->vals->unlock_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1110 | *unlock = 1; |
| 1111 | /* Check if unlock includes more than one lock range */ |
| 1112 | } else if (flock->fl_type == F_RDLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1113 | cFYI(1, "F_RDLCK"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1114 | *type |= server->vals->shared_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1115 | *lock = 1; |
| 1116 | } else if (flock->fl_type == F_EXLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1117 | cFYI(1, "F_EXLCK"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1118 | *type |= server->vals->exclusive_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1119 | *lock = 1; |
| 1120 | } else if (flock->fl_type == F_SHLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1121 | cFYI(1, "F_SHLCK"); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1122 | *type |= server->vals->shared_lock_type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1123 | *lock = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | } else |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1125 | cFYI(1, "Unknown type of lock"); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1126 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1128 | static int |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1129 | cifs_mandatory_lock(int xid, struct cifsFileInfo *cfile, __u64 offset, |
| 1130 | __u64 length, __u32 type, int lock, int unlock, bool wait) |
| 1131 | { |
| 1132 | return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->netfid, |
| 1133 | current->tgid, length, offset, unlock, lock, |
| 1134 | (__u8)type, wait, 0); |
| 1135 | } |
| 1136 | |
| 1137 | static int |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1138 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1139 | bool wait_flag, bool posix_lck, int xid) |
| 1140 | { |
| 1141 | int rc = 0; |
| 1142 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1143 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| 1144 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1145 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1146 | __u16 netfid = cfile->netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1148 | if (posix_lck) { |
| 1149 | int posix_lock_type; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1150 | |
| 1151 | rc = cifs_posix_lock_test(file, flock); |
| 1152 | if (!rc) |
| 1153 | return rc; |
| 1154 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1155 | if (type & server->vals->shared_lock_type) |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1156 | posix_lock_type = CIFS_RDLCK; |
| 1157 | else |
| 1158 | posix_lock_type = CIFS_WRLCK; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1159 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
Jeff Layton | c5fd363 | 2012-07-23 13:28:37 -0400 | [diff] [blame] | 1160 | flock->fl_start, length, flock, |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1161 | posix_lock_type, wait_flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | return rc; |
| 1163 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1164 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1165 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1166 | if (!rc) |
| 1167 | return rc; |
| 1168 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1169 | /* BB we could chain these into one lock request BB */ |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1170 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, type, |
| 1171 | 1, 0, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1172 | if (rc == 0) { |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1173 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
| 1174 | type, 0, 1, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1175 | flock->fl_type = F_UNLCK; |
| 1176 | if (rc != 0) |
| 1177 | cERROR(1, "Error unlocking previously locked " |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1178 | "range %d during test of lock", rc); |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1179 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1180 | } |
| 1181 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1182 | if (type & server->vals->shared_lock_type) { |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1183 | flock->fl_type = F_WRLCK; |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1184 | return 0; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1185 | } |
| 1186 | |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1187 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
| 1188 | type | server->vals->shared_lock_type, 1, 0, |
| 1189 | false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1190 | if (rc == 0) { |
Pavel Shilovsky | 55157df | 2012-02-28 14:04:17 +0300 | [diff] [blame] | 1191 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
| 1192 | type | server->vals->shared_lock_type, |
| 1193 | 0, 1, false); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1194 | flock->fl_type = F_RDLCK; |
| 1195 | if (rc != 0) |
| 1196 | cERROR(1, "Error unlocking previously locked " |
| 1197 | "range %d during test of lock", rc); |
| 1198 | } else |
| 1199 | flock->fl_type = F_WRLCK; |
| 1200 | |
Pavel Shilovsky | a88b470 | 2011-10-29 17:17:59 +0400 | [diff] [blame] | 1201 | return 0; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1202 | } |
| 1203 | |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1204 | static void |
| 1205 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
| 1206 | { |
| 1207 | struct list_head *li, *tmp; |
| 1208 | list_for_each_safe(li, tmp, source) |
| 1209 | list_move(li, dest); |
| 1210 | } |
| 1211 | |
| 1212 | static void |
| 1213 | cifs_free_llist(struct list_head *llist) |
| 1214 | { |
| 1215 | struct cifsLockInfo *li, *tmp; |
| 1216 | list_for_each_entry_safe(li, tmp, llist, llist) { |
| 1217 | cifs_del_lock_waiters(li); |
| 1218 | list_del(&li->llist); |
| 1219 | kfree(li); |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | static int |
| 1224 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, int xid) |
| 1225 | { |
| 1226 | int rc = 0, stored_rc; |
| 1227 | int types[] = {LOCKING_ANDX_LARGE_FILES, |
| 1228 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; |
| 1229 | unsigned int i; |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1230 | unsigned int max_num, num, max_buf; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1231 | LOCKING_ANDX_RANGE *buf, *cur; |
| 1232 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| 1233 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
| 1234 | struct cifsLockInfo *li, *tmp; |
| 1235 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
| 1236 | struct list_head tmp_llist; |
| 1237 | |
| 1238 | INIT_LIST_HEAD(&tmp_llist); |
| 1239 | |
Pavel Shilovsky | 0013fb4 | 2012-05-31 13:03:26 +0400 | [diff] [blame] | 1240 | /* |
| 1241 | * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| 1242 | * and check it for zero before using. |
| 1243 | */ |
| 1244 | max_buf = tcon->ses->server->maxBuf; |
| 1245 | if (!max_buf) |
| 1246 | return -EINVAL; |
| 1247 | |
| 1248 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
| 1249 | sizeof(LOCKING_ANDX_RANGE); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1250 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
| 1251 | if (!buf) |
| 1252 | return -ENOMEM; |
| 1253 | |
| 1254 | mutex_lock(&cinode->lock_mutex); |
| 1255 | for (i = 0; i < 2; i++) { |
| 1256 | cur = buf; |
| 1257 | num = 0; |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1258 | list_for_each_entry_safe(li, tmp, &cfile->llist, llist) { |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1259 | if (flock->fl_start > li->offset || |
| 1260 | (flock->fl_start + length) < |
| 1261 | (li->offset + li->length)) |
| 1262 | continue; |
| 1263 | if (current->tgid != li->pid) |
| 1264 | continue; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1265 | if (types[i] != li->type) |
| 1266 | continue; |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1267 | if (cinode->can_cache_brlcks) { |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1268 | /* |
| 1269 | * We can cache brlock requests - simply remove |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1270 | * a lock from the file's list. |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1271 | */ |
| 1272 | list_del(&li->llist); |
| 1273 | cifs_del_lock_waiters(li); |
| 1274 | kfree(li); |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1275 | continue; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1276 | } |
Pavel Shilovsky | ea319d5 | 2012-05-31 13:59:36 +0400 | [diff] [blame] | 1277 | cur->Pid = cpu_to_le16(li->pid); |
| 1278 | cur->LengthLow = cpu_to_le32((u32)li->length); |
| 1279 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| 1280 | cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| 1281 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| 1282 | /* |
| 1283 | * We need to save a lock here to let us add it again to |
| 1284 | * the file's list if the unlock range request fails on |
| 1285 | * the server. |
| 1286 | */ |
| 1287 | list_move(&li->llist, &tmp_llist); |
| 1288 | if (++num == max_num) { |
| 1289 | stored_rc = cifs_lockv(xid, tcon, cfile->netfid, |
| 1290 | li->type, num, 0, buf); |
| 1291 | if (stored_rc) { |
| 1292 | /* |
| 1293 | * We failed on the unlock range |
| 1294 | * request - add all locks from the tmp |
| 1295 | * list to the head of the file's list. |
| 1296 | */ |
| 1297 | cifs_move_llist(&tmp_llist, |
| 1298 | &cfile->llist); |
| 1299 | rc = stored_rc; |
| 1300 | } else |
| 1301 | /* |
| 1302 | * The unlock range request succeed - |
| 1303 | * free the tmp list. |
| 1304 | */ |
| 1305 | cifs_free_llist(&tmp_llist); |
| 1306 | cur = buf; |
| 1307 | num = 0; |
| 1308 | } else |
| 1309 | cur++; |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1310 | } |
| 1311 | if (num) { |
| 1312 | stored_rc = cifs_lockv(xid, tcon, cfile->netfid, |
| 1313 | types[i], num, 0, buf); |
| 1314 | if (stored_rc) { |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1315 | cifs_move_llist(&tmp_llist, &cfile->llist); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1316 | rc = stored_rc; |
| 1317 | } else |
| 1318 | cifs_free_llist(&tmp_llist); |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | mutex_unlock(&cinode->lock_mutex); |
| 1323 | kfree(buf); |
| 1324 | return rc; |
| 1325 | } |
| 1326 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1327 | static int |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1328 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1329 | bool wait_flag, bool posix_lck, int lock, int unlock, int xid) |
| 1330 | { |
| 1331 | int rc = 0; |
| 1332 | __u64 length = 1 + flock->fl_end - flock->fl_start; |
| 1333 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| 1334 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1335 | struct TCP_Server_Info *server = tcon->ses->server; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1336 | __u16 netfid = cfile->netfid; |
| 1337 | |
| 1338 | if (posix_lck) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 1339 | int posix_lock_type; |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1340 | |
| 1341 | rc = cifs_posix_lock_set(file, flock); |
| 1342 | if (!rc || rc < 0) |
| 1343 | return rc; |
| 1344 | |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1345 | if (type & server->vals->shared_lock_type) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 1346 | posix_lock_type = CIFS_RDLCK; |
| 1347 | else |
| 1348 | posix_lock_type = CIFS_WRLCK; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1349 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1350 | if (unlock == 1) |
Steve French | beb84dc | 2006-03-03 23:36:34 +0000 | [diff] [blame] | 1351 | posix_lock_type = CIFS_UNLCK; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1352 | |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1353 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
Jeff Layton | c5fd363 | 2012-07-23 13:28:37 -0400 | [diff] [blame] | 1354 | flock->fl_start, length, NULL, |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1355 | posix_lock_type, wait_flag); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1356 | goto out; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1357 | } |
| 1358 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1359 | if (lock) { |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1360 | struct cifsLockInfo *lock; |
| 1361 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1362 | lock = cifs_lock_init(flock->fl_start, length, type); |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1363 | if (!lock) |
| 1364 | return -ENOMEM; |
| 1365 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1366 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1367 | if (rc < 0) |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1368 | kfree(lock); |
| 1369 | if (rc <= 0) |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 1370 | goto out; |
| 1371 | |
Pavel Shilovsky | 7f92447 | 2012-03-28 17:10:25 +0400 | [diff] [blame] | 1372 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
| 1373 | type, 1, 0, wait_flag); |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1374 | if (rc) { |
| 1375 | kfree(lock); |
| 1376 | goto out; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1377 | } |
Pavel Shilovsky | 161ebf9 | 2011-10-29 17:17:58 +0400 | [diff] [blame] | 1378 | |
Pavel Shilovsky | fbd35ac | 2012-02-24 15:41:06 +0300 | [diff] [blame] | 1379 | cifs_lock_add(cfile, lock); |
Pavel Shilovsky | 9ee305b | 2011-10-22 15:33:31 +0400 | [diff] [blame] | 1380 | } else if (unlock) |
| 1381 | rc = cifs_unlock_range(cfile, flock, xid); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1382 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1383 | out: |
| 1384 | if (flock->fl_flags & FL_POSIX) |
Steve French | 9ebb389 | 2012-04-01 13:52:54 -0500 | [diff] [blame] | 1385 | posix_lock_file_wait(file, flock); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1386 | return rc; |
| 1387 | } |
| 1388 | |
| 1389 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) |
| 1390 | { |
| 1391 | int rc, xid; |
| 1392 | int lock = 0, unlock = 0; |
| 1393 | bool wait_flag = false; |
| 1394 | bool posix_lck = false; |
| 1395 | struct cifs_sb_info *cifs_sb; |
| 1396 | struct cifs_tcon *tcon; |
| 1397 | struct cifsInodeInfo *cinode; |
| 1398 | struct cifsFileInfo *cfile; |
| 1399 | __u16 netfid; |
Pavel Shilovsky | 04a6aa8 | 2012-02-28 14:16:55 +0300 | [diff] [blame] | 1400 | __u32 type; |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1401 | |
| 1402 | rc = -EACCES; |
| 1403 | xid = GetXid(); |
| 1404 | |
| 1405 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " |
| 1406 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, |
| 1407 | flock->fl_start, flock->fl_end); |
| 1408 | |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1409 | cfile = (struct cifsFileInfo *)file->private_data; |
| 1410 | tcon = tlink_tcon(cfile->tlink); |
Pavel Shilovsky | 106dc53 | 2012-02-28 14:23:34 +0300 | [diff] [blame] | 1411 | |
| 1412 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, |
| 1413 | tcon->ses->server); |
| 1414 | |
| 1415 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1416 | netfid = cfile->netfid; |
| 1417 | cinode = CIFS_I(file->f_path.dentry->d_inode); |
| 1418 | |
| 1419 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 1420 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| 1421 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| 1422 | posix_lck = true; |
| 1423 | /* |
| 1424 | * BB add code here to normalize offset and length to account for |
| 1425 | * negative length which we can not accept over the wire. |
| 1426 | */ |
| 1427 | if (IS_GETLK(cmd)) { |
Pavel Shilovsky | 4f6bcec | 2011-10-22 15:33:30 +0400 | [diff] [blame] | 1428 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 1429 | FreeXid(xid); |
| 1430 | return rc; |
| 1431 | } |
| 1432 | |
| 1433 | if (!lock && !unlock) { |
| 1434 | /* |
| 1435 | * if no lock or unlock then nothing to do since we do not |
| 1436 | * know what it is |
| 1437 | */ |
| 1438 | FreeXid(xid); |
| 1439 | return -EOPNOTSUPP; |
| 1440 | } |
| 1441 | |
| 1442 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
| 1443 | xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | FreeXid(xid); |
| 1445 | return rc; |
| 1446 | } |
| 1447 | |
Jeff Layton | 597b027 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1448 | /* |
| 1449 | * update the file size (if needed) after a write. Should be called with |
| 1450 | * the inode->i_lock held |
| 1451 | */ |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 1452 | void |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1453 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
| 1454 | unsigned int bytes_written) |
| 1455 | { |
| 1456 | loff_t end_of_write = offset + bytes_written; |
| 1457 | |
| 1458 | if (end_of_write > cifsi->server_eof) |
| 1459 | cifsi->server_eof = end_of_write; |
| 1460 | } |
| 1461 | |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1462 | static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid, |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1463 | const char *write_data, size_t write_size, |
| 1464 | loff_t *poffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | { |
| 1466 | int rc = 0; |
| 1467 | unsigned int bytes_written = 0; |
| 1468 | unsigned int total_written; |
| 1469 | struct cifs_sb_info *cifs_sb; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 1470 | struct cifs_tcon *pTcon; |
Jeff Layton | 7749981 | 2011-01-11 07:24:23 -0500 | [diff] [blame] | 1471 | int xid; |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1472 | struct dentry *dentry = open_file->dentry; |
| 1473 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1474 | struct cifs_io_parms io_parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1476 | cifs_sb = CIFS_SB(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1478 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1479 | *poffset, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1481 | pTcon = tlink_tcon(open_file->tlink); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | for (total_written = 0; write_size > total_written; |
| 1486 | total_written += bytes_written) { |
| 1487 | rc = -EAGAIN; |
| 1488 | while (rc == -EAGAIN) { |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 1489 | struct kvec iov[2]; |
| 1490 | unsigned int len; |
| 1491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | /* we could deadlock if we called |
| 1494 | filemap_fdatawait from here so tell |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1495 | reopen_file not to flush data to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | server now */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1497 | rc = cifs_reopen_file(open_file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | if (rc != 0) |
| 1499 | break; |
| 1500 | } |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1501 | |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 1502 | len = min((size_t)cifs_sb->wsize, |
| 1503 | write_size - total_written); |
| 1504 | /* iov[0] is reserved for smb header */ |
| 1505 | iov[1].iov_base = (char *)write_data + total_written; |
| 1506 | iov[1].iov_len = len; |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1507 | io_parms.netfid = open_file->netfid; |
| 1508 | io_parms.pid = pid; |
| 1509 | io_parms.tcon = pTcon; |
| 1510 | io_parms.offset = *poffset; |
| 1511 | io_parms.length = len; |
| 1512 | rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov, |
| 1513 | 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | } |
| 1515 | if (rc || (bytes_written == 0)) { |
| 1516 | if (total_written) |
| 1517 | break; |
| 1518 | else { |
| 1519 | FreeXid(xid); |
| 1520 | return rc; |
| 1521 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1522 | } else { |
Jeff Layton | 597b027 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1523 | spin_lock(&dentry->d_inode->i_lock); |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1524 | cifs_update_eof(cifsi, *poffset, bytes_written); |
Jeff Layton | 597b027 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1525 | spin_unlock(&dentry->d_inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | *poffset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | } |
| 1529 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1530 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1532 | if (total_written > 0) { |
| 1533 | spin_lock(&dentry->d_inode->i_lock); |
| 1534 | if (*poffset > dentry->d_inode->i_size) |
| 1535 | i_size_write(dentry->d_inode, *poffset); |
| 1536 | spin_unlock(&dentry->d_inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1538 | mark_inode_dirty_sync(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | FreeXid(xid); |
| 1540 | return total_written; |
| 1541 | } |
| 1542 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1543 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
| 1544 | bool fsuid_only) |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1545 | { |
| 1546 | struct cifsFileInfo *open_file = NULL; |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1547 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
| 1548 | |
| 1549 | /* only filter by fsuid on multiuser mounts */ |
| 1550 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1551 | fsuid_only = false; |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1552 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1553 | spin_lock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1554 | /* we could simply get the first_list_entry since write-only entries |
| 1555 | are always at the end of the list but since the first entry might |
| 1556 | have a close pending, we go through the whole list */ |
| 1557 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1558 | if (fsuid_only && open_file->uid != current_fsuid()) |
| 1559 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1560 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1561 | if (!open_file->invalidHandle) { |
| 1562 | /* found a good file */ |
| 1563 | /* lock it so it will not be closed on us */ |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1564 | cifsFileInfo_get(open_file); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1565 | spin_unlock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1566 | return open_file; |
| 1567 | } /* else might as well continue, and look for |
| 1568 | another, or simply have the caller reopen it |
| 1569 | again rather than trying to fix this handle */ |
| 1570 | } else /* write only file */ |
| 1571 | break; /* write only files are last so must be done */ |
| 1572 | } |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1573 | spin_unlock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1574 | return NULL; |
| 1575 | } |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1576 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1577 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
| 1578 | bool fsuid_only) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1579 | { |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1580 | struct cifsFileInfo *open_file, *inv_file = NULL; |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1581 | struct cifs_sb_info *cifs_sb; |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1582 | bool any_available = false; |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1583 | int rc; |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1584 | unsigned int refind = 0; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1585 | |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1586 | /* Having a null inode here (because mapping->host was set to zero by |
| 1587 | the VFS or MM) should not happen but we had reports of on oops (due to |
| 1588 | it being zero) during stress testcases so we need to check for it */ |
| 1589 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1590 | if (cifs_inode == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1591 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1592 | dump_stack(); |
| 1593 | return NULL; |
| 1594 | } |
| 1595 | |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1596 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
| 1597 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1598 | /* only filter by fsuid on multiuser mounts */ |
| 1599 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1600 | fsuid_only = false; |
| 1601 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1602 | spin_lock(&cifs_file_list_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1603 | refind_writable: |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1604 | if (refind > MAX_REOPEN_ATT) { |
| 1605 | spin_unlock(&cifs_file_list_lock); |
| 1606 | return NULL; |
| 1607 | } |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1608 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1609 | if (!any_available && open_file->pid != current->tgid) |
| 1610 | continue; |
| 1611 | if (fsuid_only && open_file->uid != current_fsuid()) |
| 1612 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1613 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1614 | if (!open_file->invalidHandle) { |
| 1615 | /* found a good writable file */ |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1616 | cifsFileInfo_get(open_file); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1617 | spin_unlock(&cifs_file_list_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1618 | return open_file; |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1619 | } else { |
| 1620 | if (!inv_file) |
| 1621 | inv_file = open_file; |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1622 | } |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1623 | } |
| 1624 | } |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1625 | /* couldn't find useable FH with same pid, try any available */ |
| 1626 | if (!any_available) { |
| 1627 | any_available = true; |
| 1628 | goto refind_writable; |
| 1629 | } |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1630 | |
| 1631 | if (inv_file) { |
| 1632 | any_available = false; |
| 1633 | cifsFileInfo_get(inv_file); |
| 1634 | } |
| 1635 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1636 | spin_unlock(&cifs_file_list_lock); |
Shirish Pargaonkar | 2c0c2a0 | 2012-05-21 09:20:12 -0500 | [diff] [blame] | 1637 | |
| 1638 | if (inv_file) { |
| 1639 | rc = cifs_reopen_file(inv_file, false); |
| 1640 | if (!rc) |
| 1641 | return inv_file; |
| 1642 | else { |
| 1643 | spin_lock(&cifs_file_list_lock); |
| 1644 | list_move_tail(&inv_file->flist, |
| 1645 | &cifs_inode->openFileList); |
| 1646 | spin_unlock(&cifs_file_list_lock); |
| 1647 | cifsFileInfo_put(inv_file); |
| 1648 | spin_lock(&cifs_file_list_lock); |
| 1649 | ++refind; |
| 1650 | goto refind_writable; |
| 1651 | } |
| 1652 | } |
| 1653 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1654 | return NULL; |
| 1655 | } |
| 1656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
| 1658 | { |
| 1659 | struct address_space *mapping = page->mapping; |
| 1660 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1661 | char *write_data; |
| 1662 | int rc = -EFAULT; |
| 1663 | int bytes_written = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | struct inode *inode; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1665 | struct cifsFileInfo *open_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
| 1667 | if (!mapping || !mapping->host) |
| 1668 | return -EFAULT; |
| 1669 | |
| 1670 | inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
| 1672 | offset += (loff_t)from; |
| 1673 | write_data = kmap(page); |
| 1674 | write_data += from; |
| 1675 | |
| 1676 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { |
| 1677 | kunmap(page); |
| 1678 | return -EIO; |
| 1679 | } |
| 1680 | |
| 1681 | /* racing with truncate? */ |
| 1682 | if (offset > mapping->host->i_size) { |
| 1683 | kunmap(page); |
| 1684 | return 0; /* don't care */ |
| 1685 | } |
| 1686 | |
| 1687 | /* check to make sure that we are not extending the file */ |
| 1688 | if (mapping->host->i_size - offset < (loff_t)to) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1689 | to = (unsigned)(mapping->host->i_size - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1691 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1692 | if (open_file) { |
Pavel Shilovsky | fa2989f | 2011-05-26 10:01:59 +0400 | [diff] [blame] | 1693 | bytes_written = cifs_write(open_file, open_file->pid, |
| 1694 | write_data, to - from, &offset); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1695 | cifsFileInfo_put(open_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | /* Does mm or vfs already set times? */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1697 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1698 | if ((bytes_written > 0) && (offset)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1699 | rc = 0; |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1700 | else if (bytes_written < 0) |
| 1701 | rc = bytes_written; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1702 | } else { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1703 | cFYI(1, "No writeable filehandles for inode"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | rc = -EIO; |
| 1705 | } |
| 1706 | |
| 1707 | kunmap(page); |
| 1708 | return rc; |
| 1709 | } |
| 1710 | |
Jeff Layton | e949287 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1711 | /* |
| 1712 | * Marshal up the iov array, reserving the first one for the header. Also, |
| 1713 | * set wdata->bytes. |
| 1714 | */ |
| 1715 | static void |
| 1716 | cifs_writepages_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata) |
| 1717 | { |
| 1718 | int i; |
| 1719 | struct inode *inode = wdata->cfile->dentry->d_inode; |
| 1720 | loff_t size = i_size_read(inode); |
| 1721 | |
| 1722 | /* marshal up the pages into iov array */ |
| 1723 | wdata->bytes = 0; |
| 1724 | for (i = 0; i < wdata->nr_pages; i++) { |
| 1725 | iov[i + 1].iov_len = min(size - page_offset(wdata->pages[i]), |
| 1726 | (loff_t)PAGE_CACHE_SIZE); |
| 1727 | iov[i + 1].iov_base = kmap(wdata->pages[i]); |
| 1728 | wdata->bytes += iov[i + 1].iov_len; |
| 1729 | } |
| 1730 | } |
| 1731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | static int cifs_writepages(struct address_space *mapping, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1733 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | { |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1735 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
| 1736 | bool done = false, scanned = false, range_whole = false; |
| 1737 | pgoff_t end, index; |
| 1738 | struct cifs_writedata *wdata; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1739 | struct page *page; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1740 | int rc = 0; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1741 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1742 | /* |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1743 | * If wsize is smaller than the page cache size, default to writing |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1744 | * one page at a time via cifs_writepage |
| 1745 | */ |
| 1746 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) |
| 1747 | return generic_writepages(mapping, wbc); |
| 1748 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1749 | if (wbc->range_cyclic) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1750 | index = mapping->writeback_index; /* Start from prev offset */ |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1751 | end = -1; |
| 1752 | } else { |
| 1753 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 1754 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 1755 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1756 | range_whole = true; |
| 1757 | scanned = true; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1758 | } |
| 1759 | retry: |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1760 | while (!done && index <= end) { |
| 1761 | unsigned int i, nr_pages, found_pages; |
| 1762 | pgoff_t next = 0, tofind; |
| 1763 | struct page **pages; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1764 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1765 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, |
| 1766 | end - index) + 1; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1767 | |
Jeff Layton | c2e8764 | 2012-03-23 14:40:55 -0400 | [diff] [blame] | 1768 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
| 1769 | cifs_writev_complete); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1770 | if (!wdata) { |
| 1771 | rc = -ENOMEM; |
| 1772 | break; |
| 1773 | } |
| 1774 | |
| 1775 | /* |
| 1776 | * find_get_pages_tag seems to return a max of 256 on each |
| 1777 | * iteration, so we must call it several times in order to |
| 1778 | * fill the array or the wsize is effectively limited to |
| 1779 | * 256 * PAGE_CACHE_SIZE. |
| 1780 | */ |
| 1781 | found_pages = 0; |
| 1782 | pages = wdata->pages; |
| 1783 | do { |
| 1784 | nr_pages = find_get_pages_tag(mapping, &index, |
| 1785 | PAGECACHE_TAG_DIRTY, |
| 1786 | tofind, pages); |
| 1787 | found_pages += nr_pages; |
| 1788 | tofind -= nr_pages; |
| 1789 | pages += nr_pages; |
| 1790 | } while (nr_pages && tofind && index <= end); |
| 1791 | |
| 1792 | if (found_pages == 0) { |
| 1793 | kref_put(&wdata->refcount, cifs_writedata_release); |
| 1794 | break; |
| 1795 | } |
| 1796 | |
| 1797 | nr_pages = 0; |
| 1798 | for (i = 0; i < found_pages; i++) { |
| 1799 | page = wdata->pages[i]; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1800 | /* |
| 1801 | * At this point we hold neither mapping->tree_lock nor |
| 1802 | * lock on the page itself: the page may be truncated or |
| 1803 | * invalidated (changing page->mapping to NULL), or even |
| 1804 | * swizzled back from swapper_space to tmpfs file |
| 1805 | * mapping |
| 1806 | */ |
| 1807 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1808 | if (nr_pages == 0) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1809 | lock_page(page); |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 1810 | else if (!trylock_page(page)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1811 | break; |
| 1812 | |
| 1813 | if (unlikely(page->mapping != mapping)) { |
| 1814 | unlock_page(page); |
| 1815 | break; |
| 1816 | } |
| 1817 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1818 | if (!wbc->range_cyclic && page->index > end) { |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1819 | done = true; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1820 | unlock_page(page); |
| 1821 | break; |
| 1822 | } |
| 1823 | |
| 1824 | if (next && (page->index != next)) { |
| 1825 | /* Not next consecutive page */ |
| 1826 | unlock_page(page); |
| 1827 | break; |
| 1828 | } |
| 1829 | |
| 1830 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 1831 | wait_on_page_writeback(page); |
| 1832 | |
| 1833 | if (PageWriteback(page) || |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1834 | !clear_page_dirty_for_io(page)) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1835 | unlock_page(page); |
| 1836 | break; |
| 1837 | } |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1838 | |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1839 | /* |
| 1840 | * This actually clears the dirty bit in the radix tree. |
| 1841 | * See cifs_writepage() for more commentary. |
| 1842 | */ |
| 1843 | set_page_writeback(page); |
| 1844 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1845 | if (page_offset(page) >= mapping->host->i_size) { |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1846 | done = true; |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1847 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1848 | end_page_writeback(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1849 | break; |
| 1850 | } |
| 1851 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1852 | wdata->pages[i] = page; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1853 | next = page->index + 1; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1854 | ++nr_pages; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1855 | } |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1856 | |
| 1857 | /* reset index to refind any pages skipped */ |
| 1858 | if (nr_pages == 0) |
| 1859 | index = wdata->pages[0]->index + 1; |
| 1860 | |
| 1861 | /* put any pages we aren't going to use */ |
| 1862 | for (i = nr_pages; i < found_pages; i++) { |
| 1863 | page_cache_release(wdata->pages[i]); |
| 1864 | wdata->pages[i] = NULL; |
| 1865 | } |
| 1866 | |
| 1867 | /* nothing to write? */ |
| 1868 | if (nr_pages == 0) { |
| 1869 | kref_put(&wdata->refcount, cifs_writedata_release); |
| 1870 | continue; |
| 1871 | } |
| 1872 | |
| 1873 | wdata->sync_mode = wbc->sync_mode; |
| 1874 | wdata->nr_pages = nr_pages; |
| 1875 | wdata->offset = page_offset(wdata->pages[0]); |
Jeff Layton | e949287 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 1876 | wdata->marshal_iov = cifs_writepages_marshal_iov; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1877 | |
| 1878 | do { |
| 1879 | if (wdata->cfile != NULL) |
| 1880 | cifsFileInfo_put(wdata->cfile); |
| 1881 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), |
| 1882 | false); |
| 1883 | if (!wdata->cfile) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1884 | cERROR(1, "No writable handles for inode"); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1885 | rc = -EBADF; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1886 | break; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1887 | } |
Jeff Layton | fe5f5d2 | 2012-03-23 14:40:55 -0400 | [diff] [blame] | 1888 | wdata->pid = wdata->cfile->pid; |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1889 | rc = cifs_async_writev(wdata); |
| 1890 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1891 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1892 | for (i = 0; i < nr_pages; ++i) |
| 1893 | unlock_page(wdata->pages[i]); |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 1894 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1895 | /* send failure -- clean up the mess */ |
| 1896 | if (rc != 0) { |
| 1897 | for (i = 0; i < nr_pages; ++i) { |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 1898 | if (rc == -EAGAIN) |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1899 | redirty_page_for_writepage(wbc, |
| 1900 | wdata->pages[i]); |
| 1901 | else |
| 1902 | SetPageError(wdata->pages[i]); |
| 1903 | end_page_writeback(wdata->pages[i]); |
| 1904 | page_cache_release(wdata->pages[i]); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1905 | } |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 1906 | if (rc != -EAGAIN) |
| 1907 | mapping_set_error(mapping, rc); |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1908 | } |
| 1909 | kref_put(&wdata->refcount, cifs_writedata_release); |
Jeff Layton | 941b853 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 1910 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1911 | wbc->nr_to_write -= nr_pages; |
| 1912 | if (wbc->nr_to_write <= 0) |
| 1913 | done = true; |
Dave Kleikamp | b066a48 | 2008-11-18 03:49:05 +0000 | [diff] [blame] | 1914 | |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1915 | index = next; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1916 | } |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1917 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1918 | if (!scanned && !done) { |
| 1919 | /* |
| 1920 | * We hit the last page and there is more work to be done: wrap |
| 1921 | * back to the start of the file |
| 1922 | */ |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1923 | scanned = true; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1924 | index = 0; |
| 1925 | goto retry; |
| 1926 | } |
Jeff Layton | c3d17b6 | 2011-05-19 16:22:57 -0400 | [diff] [blame] | 1927 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1928 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1929 | mapping->writeback_index = index; |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | return rc; |
| 1932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 1934 | static int |
| 1935 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | { |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 1937 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | int xid; |
| 1939 | |
| 1940 | xid = GetXid(); |
| 1941 | /* BB add check for wbc flags */ |
| 1942 | page_cache_get(page); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1943 | if (!PageUptodate(page)) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1944 | cFYI(1, "ppw - page not up to date"); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1945 | |
| 1946 | /* |
| 1947 | * Set the "writeback" flag, and clear "dirty" in the radix tree. |
| 1948 | * |
| 1949 | * A writepage() implementation always needs to do either this, |
| 1950 | * or re-dirty the page with "redirty_page_for_writepage()" in |
| 1951 | * the case of a failure. |
| 1952 | * |
| 1953 | * Just unlocking the page will cause the radix tree tag-bits |
| 1954 | * to fail to update with the state of the page correctly. |
| 1955 | */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1956 | set_page_writeback(page); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 1957 | retry_write: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 1959 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
| 1960 | goto retry_write; |
| 1961 | else if (rc == -EAGAIN) |
| 1962 | redirty_page_for_writepage(wbc, page); |
| 1963 | else if (rc != 0) |
| 1964 | SetPageError(page); |
| 1965 | else |
| 1966 | SetPageUptodate(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1967 | end_page_writeback(page); |
| 1968 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | FreeXid(xid); |
| 1970 | return rc; |
| 1971 | } |
| 1972 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 1973 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
| 1974 | { |
| 1975 | int rc = cifs_writepage_locked(page, wbc); |
| 1976 | unlock_page(page); |
| 1977 | return rc; |
| 1978 | } |
| 1979 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1980 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
| 1981 | loff_t pos, unsigned len, unsigned copied, |
| 1982 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1984 | int rc; |
| 1985 | struct inode *inode = mapping->host; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 1986 | struct cifsFileInfo *cfile = file->private_data; |
| 1987 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
| 1988 | __u32 pid; |
| 1989 | |
| 1990 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 1991 | pid = cfile->pid; |
| 1992 | else |
| 1993 | pid = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1995 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
| 1996 | page, pos, copied); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1997 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 1998 | if (PageChecked(page)) { |
| 1999 | if (copied == len) |
| 2000 | SetPageUptodate(page); |
| 2001 | ClearPageChecked(page); |
| 2002 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2003 | SetPageUptodate(page); |
| 2004 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | if (!PageUptodate(page)) { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2006 | char *page_data; |
| 2007 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 2008 | int xid; |
| 2009 | |
| 2010 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | /* this is probably better than directly calling |
| 2012 | partialpage_write since in this function the file handle is |
| 2013 | known which we might as well leverage */ |
| 2014 | /* BB check if anything else missing out of ppw |
| 2015 | such as updating last write time */ |
| 2016 | page_data = kmap(page); |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2017 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2018 | /* if (rc < 0) should we set writebehind rc? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | kunmap(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2020 | |
| 2021 | FreeXid(xid); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2022 | } else { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2023 | rc = copied; |
| 2024 | pos += copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | set_page_dirty(page); |
| 2026 | } |
| 2027 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2028 | if (rc > 0) { |
| 2029 | spin_lock(&inode->i_lock); |
| 2030 | if (pos > inode->i_size) |
| 2031 | i_size_write(inode, pos); |
| 2032 | spin_unlock(&inode->i_lock); |
| 2033 | } |
| 2034 | |
| 2035 | unlock_page(page); |
| 2036 | page_cache_release(page); |
| 2037 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | return rc; |
| 2039 | } |
| 2040 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2041 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
| 2042 | int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | { |
| 2044 | int xid; |
| 2045 | int rc = 0; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 2046 | struct cifs_tcon *tcon; |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 2047 | struct cifsFileInfo *smbfile = file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 2048 | struct inode *inode = file->f_path.dentry->d_inode; |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2049 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2051 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 2052 | if (rc) |
| 2053 | return rc; |
| 2054 | mutex_lock(&inode->i_mutex); |
| 2055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | xid = GetXid(); |
| 2057 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2058 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 2059 | file->f_path.dentry->d_name.name, datasync); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 2060 | |
Pavel Shilovsky | 6feb989 | 2011-04-07 18:18:11 +0400 | [diff] [blame] | 2061 | if (!CIFS_I(inode)->clientCanCacheRead) { |
| 2062 | rc = cifs_invalidate_mapping(inode); |
| 2063 | if (rc) { |
| 2064 | cFYI(1, "rc: %d during invalidate phase", rc); |
| 2065 | rc = 0; /* don't care about it in fsync */ |
| 2066 | } |
| 2067 | } |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2068 | |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2069 | tcon = tlink_tcon(smbfile->tlink); |
| 2070 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
| 2071 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
| 2072 | |
| 2073 | FreeXid(xid); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2074 | mutex_unlock(&inode->i_mutex); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2075 | return rc; |
| 2076 | } |
| 2077 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2078 | 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] | 2079 | { |
| 2080 | int xid; |
| 2081 | int rc = 0; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 2082 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2083 | struct cifsFileInfo *smbfile = file->private_data; |
| 2084 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2085 | struct inode *inode = file->f_mapping->host; |
| 2086 | |
| 2087 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 2088 | if (rc) |
| 2089 | return rc; |
| 2090 | mutex_lock(&inode->i_mutex); |
Pavel Shilovsky | 8be7e6b | 2010-12-12 13:11:13 +0300 | [diff] [blame] | 2091 | |
| 2092 | xid = GetXid(); |
| 2093 | |
| 2094 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
| 2095 | file->f_path.dentry->d_name.name, datasync); |
| 2096 | |
| 2097 | tcon = tlink_tcon(smbfile->tlink); |
| 2098 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
| 2099 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 2100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | FreeXid(xid); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2102 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | return rc; |
| 2104 | } |
| 2105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | /* |
| 2107 | * As file closes, flush all cached write data for this inode checking |
| 2108 | * for write behind errors. |
| 2109 | */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 2110 | int cifs_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2112 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | int rc = 0; |
| 2114 | |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2115 | if (file->f_mode & FMODE_WRITE) |
Jeff Layton | d3f1322 | 2010-10-15 15:34:07 -0400 | [diff] [blame] | 2116 | rc = filemap_write_and_wait(inode->i_mapping); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 2117 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2118 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | |
| 2120 | return rc; |
| 2121 | } |
| 2122 | |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2123 | static int |
| 2124 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) |
| 2125 | { |
| 2126 | int rc = 0; |
| 2127 | unsigned long i; |
| 2128 | |
| 2129 | for (i = 0; i < num_pages; i++) { |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2130 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2131 | if (!pages[i]) { |
| 2132 | /* |
| 2133 | * save number of pages we have already allocated and |
| 2134 | * return with ENOMEM error |
| 2135 | */ |
| 2136 | num_pages = i; |
| 2137 | rc = -ENOMEM; |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2138 | break; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2139 | } |
| 2140 | } |
| 2141 | |
Jeff Layton | e94f7ba | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2142 | if (rc) { |
| 2143 | for (i = 0; i < num_pages; i++) |
| 2144 | put_page(pages[i]); |
| 2145 | } |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2146 | return rc; |
| 2147 | } |
| 2148 | |
| 2149 | static inline |
| 2150 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) |
| 2151 | { |
| 2152 | size_t num_pages; |
| 2153 | size_t clen; |
| 2154 | |
| 2155 | clen = min_t(const size_t, len, wsize); |
Jeff Layton | a7103b9 | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2156 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2157 | |
| 2158 | if (cur_len) |
| 2159 | *cur_len = clen; |
| 2160 | |
| 2161 | return num_pages; |
| 2162 | } |
| 2163 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2164 | static void |
| 2165 | cifs_uncached_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata) |
| 2166 | { |
| 2167 | int i; |
| 2168 | size_t bytes = wdata->bytes; |
| 2169 | |
| 2170 | /* marshal up the pages into iov array */ |
| 2171 | for (i = 0; i < wdata->nr_pages; i++) { |
Steve French | c7ad42b | 2012-03-23 16:30:56 -0500 | [diff] [blame] | 2172 | iov[i + 1].iov_len = min_t(size_t, bytes, PAGE_SIZE); |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2173 | iov[i + 1].iov_base = kmap(wdata->pages[i]); |
| 2174 | bytes -= iov[i + 1].iov_len; |
| 2175 | } |
| 2176 | } |
| 2177 | |
| 2178 | static void |
| 2179 | cifs_uncached_writev_complete(struct work_struct *work) |
| 2180 | { |
| 2181 | int i; |
| 2182 | struct cifs_writedata *wdata = container_of(work, |
| 2183 | struct cifs_writedata, work); |
| 2184 | struct inode *inode = wdata->cfile->dentry->d_inode; |
| 2185 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| 2186 | |
| 2187 | spin_lock(&inode->i_lock); |
| 2188 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); |
| 2189 | if (cifsi->server_eof > inode->i_size) |
| 2190 | i_size_write(inode, cifsi->server_eof); |
| 2191 | spin_unlock(&inode->i_lock); |
| 2192 | |
| 2193 | complete(&wdata->done); |
| 2194 | |
| 2195 | if (wdata->result != -EAGAIN) { |
| 2196 | for (i = 0; i < wdata->nr_pages; i++) |
| 2197 | put_page(wdata->pages[i]); |
| 2198 | } |
| 2199 | |
| 2200 | kref_put(&wdata->refcount, cifs_writedata_release); |
| 2201 | } |
| 2202 | |
| 2203 | /* attempt to send write to server, retry on any -EAGAIN errors */ |
| 2204 | static int |
| 2205 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) |
| 2206 | { |
| 2207 | int rc; |
| 2208 | |
| 2209 | do { |
| 2210 | if (wdata->cfile->invalidHandle) { |
| 2211 | rc = cifs_reopen_file(wdata->cfile, false); |
| 2212 | if (rc != 0) |
| 2213 | continue; |
| 2214 | } |
| 2215 | rc = cifs_async_writev(wdata); |
| 2216 | } while (rc == -EAGAIN); |
| 2217 | |
| 2218 | return rc; |
| 2219 | } |
| 2220 | |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2221 | static ssize_t |
| 2222 | cifs_iovec_write(struct file *file, const struct iovec *iov, |
| 2223 | unsigned long nr_segs, loff_t *poffset) |
| 2224 | { |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2225 | unsigned long nr_pages, i; |
Pavel Shilovsky | 76429c1 | 2011-01-31 16:03:08 +0300 | [diff] [blame] | 2226 | size_t copied, len, cur_len; |
| 2227 | ssize_t total_written = 0; |
Jeff Layton | 3af9d8f | 2012-04-13 17:16:59 -0400 | [diff] [blame] | 2228 | loff_t offset; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2229 | struct iov_iter it; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2230 | struct cifsFileInfo *open_file; |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2231 | struct cifs_tcon *tcon; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2232 | struct cifs_sb_info *cifs_sb; |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2233 | struct cifs_writedata *wdata, *tmp; |
| 2234 | struct list_head wdata_list; |
| 2235 | int rc; |
| 2236 | pid_t pid; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2237 | |
| 2238 | len = iov_length(iov, nr_segs); |
| 2239 | if (!len) |
| 2240 | return 0; |
| 2241 | |
| 2242 | rc = generic_write_checks(file, poffset, &len, 0); |
| 2243 | if (rc) |
| 2244 | return rc; |
| 2245 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2246 | INIT_LIST_HEAD(&wdata_list); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2247 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2248 | open_file = file->private_data; |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2249 | tcon = tlink_tcon(open_file->tlink); |
Jeff Layton | 3af9d8f | 2012-04-13 17:16:59 -0400 | [diff] [blame] | 2250 | offset = *poffset; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2251 | |
| 2252 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2253 | pid = open_file->pid; |
| 2254 | else |
| 2255 | pid = current->tgid; |
| 2256 | |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2257 | iov_iter_init(&it, iov, nr_segs, len, 0); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2258 | do { |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2259 | size_t save_len; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2260 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2261 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); |
| 2262 | wdata = cifs_writedata_alloc(nr_pages, |
| 2263 | cifs_uncached_writev_complete); |
| 2264 | if (!wdata) { |
| 2265 | rc = -ENOMEM; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2266 | break; |
| 2267 | } |
| 2268 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2269 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); |
| 2270 | if (rc) { |
| 2271 | kfree(wdata); |
| 2272 | break; |
| 2273 | } |
| 2274 | |
| 2275 | save_len = cur_len; |
| 2276 | for (i = 0; i < nr_pages; i++) { |
| 2277 | copied = min_t(const size_t, cur_len, PAGE_SIZE); |
| 2278 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, |
| 2279 | 0, copied); |
| 2280 | cur_len -= copied; |
| 2281 | iov_iter_advance(&it, copied); |
| 2282 | } |
| 2283 | cur_len = save_len - cur_len; |
| 2284 | |
| 2285 | wdata->sync_mode = WB_SYNC_ALL; |
| 2286 | wdata->nr_pages = nr_pages; |
| 2287 | wdata->offset = (__u64)offset; |
| 2288 | wdata->cfile = cifsFileInfo_get(open_file); |
| 2289 | wdata->pid = pid; |
| 2290 | wdata->bytes = cur_len; |
| 2291 | wdata->marshal_iov = cifs_uncached_marshal_iov; |
| 2292 | rc = cifs_uncached_retry_writev(wdata); |
| 2293 | if (rc) { |
| 2294 | kref_put(&wdata->refcount, cifs_writedata_release); |
| 2295 | break; |
| 2296 | } |
| 2297 | |
| 2298 | list_add_tail(&wdata->list, &wdata_list); |
| 2299 | offset += cur_len; |
| 2300 | len -= cur_len; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2301 | } while (len > 0); |
| 2302 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2303 | /* |
| 2304 | * If at least one write was successfully sent, then discard any rc |
| 2305 | * value from the later writes. If the other write succeeds, then |
| 2306 | * we'll end up returning whatever was written. If it fails, then |
| 2307 | * we'll get a new rc value from that. |
| 2308 | */ |
| 2309 | if (!list_empty(&wdata_list)) |
| 2310 | rc = 0; |
| 2311 | |
| 2312 | /* |
| 2313 | * Wait for and collect replies for any successful sends in order of |
| 2314 | * increasing offset. Once an error is hit or we get a fatal signal |
| 2315 | * while waiting, then return without waiting for any more replies. |
| 2316 | */ |
| 2317 | restart_loop: |
| 2318 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { |
| 2319 | if (!rc) { |
| 2320 | /* FIXME: freezable too? */ |
| 2321 | rc = wait_for_completion_killable(&wdata->done); |
| 2322 | if (rc) |
| 2323 | rc = -EINTR; |
| 2324 | else if (wdata->result) |
| 2325 | rc = wdata->result; |
| 2326 | else |
| 2327 | total_written += wdata->bytes; |
| 2328 | |
| 2329 | /* resend call if it's a retryable error */ |
| 2330 | if (rc == -EAGAIN) { |
| 2331 | rc = cifs_uncached_retry_writev(wdata); |
| 2332 | goto restart_loop; |
| 2333 | } |
| 2334 | } |
| 2335 | list_del_init(&wdata->list); |
| 2336 | kref_put(&wdata->refcount, cifs_writedata_release); |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2337 | } |
| 2338 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2339 | if (total_written > 0) |
| 2340 | *poffset += total_written; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2341 | |
Jeff Layton | da82f7e | 2012-03-23 14:40:56 -0400 | [diff] [blame] | 2342 | cifs_stats_bytes_written(tcon, total_written); |
| 2343 | return total_written ? total_written : (ssize_t)rc; |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2344 | } |
| 2345 | |
Pavel Shilovsky | 0b81c1c | 2011-03-10 10:11:05 +0300 | [diff] [blame] | 2346 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
Pavel Shilovsky | 72432ff | 2011-01-24 14:16:35 -0500 | [diff] [blame] | 2347 | unsigned long nr_segs, loff_t pos) |
| 2348 | { |
| 2349 | ssize_t written; |
| 2350 | struct inode *inode; |
| 2351 | |
| 2352 | inode = iocb->ki_filp->f_path.dentry->d_inode; |
| 2353 | |
| 2354 | /* |
| 2355 | * BB - optimize the way when signing is disabled. We can drop this |
| 2356 | * extra memory-to-memory copying and use iovec buffers for constructing |
| 2357 | * write request. |
| 2358 | */ |
| 2359 | |
| 2360 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); |
| 2361 | if (written > 0) { |
| 2362 | CIFS_I(inode)->invalid_mapping = true; |
| 2363 | iocb->ki_pos = pos; |
| 2364 | } |
| 2365 | |
| 2366 | return written; |
| 2367 | } |
| 2368 | |
| 2369 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, |
| 2370 | unsigned long nr_segs, loff_t pos) |
| 2371 | { |
| 2372 | struct inode *inode; |
| 2373 | |
| 2374 | inode = iocb->ki_filp->f_path.dentry->d_inode; |
| 2375 | |
| 2376 | if (CIFS_I(inode)->clientCanCacheAll) |
| 2377 | return generic_file_aio_write(iocb, iov, nr_segs, pos); |
| 2378 | |
| 2379 | /* |
| 2380 | * In strict cache mode we need to write the data to the server exactly |
| 2381 | * from the pos to pos+len-1 rather than flush all affected pages |
| 2382 | * because it may cause a error with mandatory locks on these pages but |
| 2383 | * not on the region from pos to ppos+len-1. |
| 2384 | */ |
| 2385 | |
| 2386 | return cifs_user_writev(iocb, iov, nr_segs, pos); |
| 2387 | } |
| 2388 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2389 | static struct cifs_readdata * |
| 2390 | cifs_readdata_alloc(unsigned int nr_vecs, work_func_t complete) |
| 2391 | { |
| 2392 | struct cifs_readdata *rdata; |
| 2393 | |
| 2394 | rdata = kzalloc(sizeof(*rdata) + |
| 2395 | sizeof(struct kvec) * nr_vecs, GFP_KERNEL); |
| 2396 | if (rdata != NULL) { |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2397 | kref_init(&rdata->refcount); |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2398 | INIT_LIST_HEAD(&rdata->list); |
| 2399 | init_completion(&rdata->done); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2400 | INIT_WORK(&rdata->work, complete); |
| 2401 | INIT_LIST_HEAD(&rdata->pages); |
| 2402 | } |
| 2403 | return rdata; |
| 2404 | } |
| 2405 | |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2406 | void |
| 2407 | cifs_readdata_release(struct kref *refcount) |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2408 | { |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2409 | struct cifs_readdata *rdata = container_of(refcount, |
| 2410 | struct cifs_readdata, refcount); |
| 2411 | |
| 2412 | if (rdata->cfile) |
| 2413 | cifsFileInfo_put(rdata->cfile); |
| 2414 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2415 | kfree(rdata); |
| 2416 | } |
| 2417 | |
Jeff Layton | 2a1bb13 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2418 | static int |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2419 | cifs_read_allocate_pages(struct list_head *list, unsigned int npages) |
| 2420 | { |
| 2421 | int rc = 0; |
| 2422 | struct page *page, *tpage; |
| 2423 | unsigned int i; |
| 2424 | |
| 2425 | for (i = 0; i < npages; i++) { |
| 2426 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
| 2427 | if (!page) { |
| 2428 | rc = -ENOMEM; |
| 2429 | break; |
| 2430 | } |
| 2431 | list_add(&page->lru, list); |
| 2432 | } |
| 2433 | |
| 2434 | if (rc) { |
| 2435 | list_for_each_entry_safe(page, tpage, list, lru) { |
| 2436 | list_del(&page->lru); |
| 2437 | put_page(page); |
| 2438 | } |
| 2439 | } |
| 2440 | return rc; |
| 2441 | } |
| 2442 | |
| 2443 | static void |
| 2444 | cifs_uncached_readdata_release(struct kref *refcount) |
| 2445 | { |
| 2446 | struct page *page, *tpage; |
| 2447 | struct cifs_readdata *rdata = container_of(refcount, |
| 2448 | struct cifs_readdata, refcount); |
| 2449 | |
| 2450 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { |
| 2451 | list_del(&page->lru); |
| 2452 | put_page(page); |
| 2453 | } |
| 2454 | cifs_readdata_release(refcount); |
| 2455 | } |
| 2456 | |
| 2457 | static int |
Jeff Layton | 2a1bb13 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2458 | cifs_retry_async_readv(struct cifs_readdata *rdata) |
| 2459 | { |
| 2460 | int rc; |
| 2461 | |
| 2462 | do { |
| 2463 | if (rdata->cfile->invalidHandle) { |
| 2464 | rc = cifs_reopen_file(rdata->cfile, true); |
| 2465 | if (rc != 0) |
| 2466 | continue; |
| 2467 | } |
| 2468 | rc = cifs_async_readv(rdata); |
| 2469 | } while (rc == -EAGAIN); |
| 2470 | |
| 2471 | return rc; |
| 2472 | } |
| 2473 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2474 | /** |
| 2475 | * cifs_readdata_to_iov - copy data from pages in response to an iovec |
| 2476 | * @rdata: the readdata response with list of pages holding data |
| 2477 | * @iov: vector in which we should copy the data |
| 2478 | * @nr_segs: number of segments in vector |
| 2479 | * @offset: offset into file of the first iovec |
| 2480 | * @copied: used to return the amount of data copied to the iov |
| 2481 | * |
| 2482 | * This function copies data from a list of pages in a readdata response into |
| 2483 | * an array of iovecs. It will first calculate where the data should go |
| 2484 | * based on the info in the readdata and then copy the data into that spot. |
| 2485 | */ |
| 2486 | static ssize_t |
| 2487 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, |
| 2488 | unsigned long nr_segs, loff_t offset, ssize_t *copied) |
| 2489 | { |
| 2490 | int rc = 0; |
| 2491 | struct iov_iter ii; |
| 2492 | size_t pos = rdata->offset - offset; |
| 2493 | struct page *page, *tpage; |
| 2494 | ssize_t remaining = rdata->bytes; |
| 2495 | unsigned char *pdata; |
| 2496 | |
| 2497 | /* set up iov_iter and advance to the correct offset */ |
| 2498 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); |
| 2499 | iov_iter_advance(&ii, pos); |
| 2500 | |
| 2501 | *copied = 0; |
| 2502 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { |
| 2503 | ssize_t copy; |
| 2504 | |
| 2505 | /* copy a whole page or whatever's left */ |
| 2506 | copy = min_t(ssize_t, remaining, PAGE_SIZE); |
| 2507 | |
| 2508 | /* ...but limit it to whatever space is left in the iov */ |
| 2509 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); |
| 2510 | |
| 2511 | /* go while there's data to be copied and no errors */ |
| 2512 | if (copy && !rc) { |
| 2513 | pdata = kmap(page); |
| 2514 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, |
| 2515 | (int)copy); |
| 2516 | kunmap(page); |
| 2517 | if (!rc) { |
| 2518 | *copied += copy; |
| 2519 | remaining -= copy; |
| 2520 | iov_iter_advance(&ii, copy); |
| 2521 | } |
| 2522 | } |
| 2523 | |
| 2524 | list_del(&page->lru); |
| 2525 | put_page(page); |
| 2526 | } |
| 2527 | |
| 2528 | return rc; |
| 2529 | } |
| 2530 | |
| 2531 | static void |
| 2532 | cifs_uncached_readv_complete(struct work_struct *work) |
| 2533 | { |
| 2534 | struct cifs_readdata *rdata = container_of(work, |
| 2535 | struct cifs_readdata, work); |
| 2536 | |
| 2537 | /* if the result is non-zero then the pages weren't kmapped */ |
| 2538 | if (rdata->result == 0) { |
| 2539 | struct page *page; |
| 2540 | |
| 2541 | list_for_each_entry(page, &rdata->pages, lru) |
| 2542 | kunmap(page); |
| 2543 | } |
| 2544 | |
| 2545 | complete(&rdata->done); |
| 2546 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
| 2547 | } |
| 2548 | |
| 2549 | static int |
| 2550 | cifs_uncached_read_marshal_iov(struct cifs_readdata *rdata, |
| 2551 | unsigned int remaining) |
| 2552 | { |
| 2553 | int len = 0; |
| 2554 | struct page *page, *tpage; |
| 2555 | |
| 2556 | rdata->nr_iov = 1; |
| 2557 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { |
| 2558 | if (remaining >= PAGE_SIZE) { |
| 2559 | /* enough data to fill the page */ |
| 2560 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); |
| 2561 | rdata->iov[rdata->nr_iov].iov_len = PAGE_SIZE; |
| 2562 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
| 2563 | rdata->nr_iov, page->index, |
| 2564 | rdata->iov[rdata->nr_iov].iov_base, |
| 2565 | rdata->iov[rdata->nr_iov].iov_len); |
| 2566 | ++rdata->nr_iov; |
| 2567 | len += PAGE_SIZE; |
| 2568 | remaining -= PAGE_SIZE; |
| 2569 | } else if (remaining > 0) { |
| 2570 | /* enough for partial page, fill and zero the rest */ |
| 2571 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); |
| 2572 | rdata->iov[rdata->nr_iov].iov_len = remaining; |
| 2573 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
| 2574 | rdata->nr_iov, page->index, |
| 2575 | rdata->iov[rdata->nr_iov].iov_base, |
| 2576 | rdata->iov[rdata->nr_iov].iov_len); |
| 2577 | memset(rdata->iov[rdata->nr_iov].iov_base + remaining, |
| 2578 | '\0', PAGE_SIZE - remaining); |
| 2579 | ++rdata->nr_iov; |
| 2580 | len += remaining; |
| 2581 | remaining = 0; |
| 2582 | } else { |
| 2583 | /* no need to hold page hostage */ |
| 2584 | list_del(&page->lru); |
| 2585 | put_page(page); |
| 2586 | } |
| 2587 | } |
| 2588 | |
| 2589 | return len; |
| 2590 | } |
| 2591 | |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2592 | static ssize_t |
| 2593 | cifs_iovec_read(struct file *file, const struct iovec *iov, |
| 2594 | unsigned long nr_segs, loff_t *poffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | { |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2596 | ssize_t rc; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2597 | size_t len, cur_len; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2598 | ssize_t total_read = 0; |
| 2599 | loff_t offset = *poffset; |
| 2600 | unsigned int npages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | struct cifs_sb_info *cifs_sb; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2602 | struct cifs_tcon *tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | struct cifsFileInfo *open_file; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2604 | struct cifs_readdata *rdata, *tmp; |
| 2605 | struct list_head rdata_list; |
| 2606 | pid_t pid; |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2607 | |
| 2608 | if (!nr_segs) |
| 2609 | return 0; |
| 2610 | |
| 2611 | len = iov_length(iov, nr_segs); |
| 2612 | if (!len) |
| 2613 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2615 | INIT_LIST_HEAD(&rdata_list); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 2616 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 2617 | open_file = file->private_data; |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2618 | tcon = tlink_tcon(open_file->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2619 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2620 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2621 | pid = open_file->pid; |
| 2622 | else |
| 2623 | pid = current->tgid; |
| 2624 | |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2625 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2626 | cFYI(1, "attempting read on write only file instance"); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2627 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2628 | do { |
| 2629 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); |
| 2630 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2631 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2632 | /* allocate a readdata struct */ |
| 2633 | rdata = cifs_readdata_alloc(npages, |
| 2634 | cifs_uncached_readv_complete); |
| 2635 | if (!rdata) { |
| 2636 | rc = -ENOMEM; |
| 2637 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2638 | } |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2639 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2640 | rc = cifs_read_allocate_pages(&rdata->pages, npages); |
| 2641 | if (rc) |
| 2642 | goto error; |
| 2643 | |
| 2644 | rdata->cfile = cifsFileInfo_get(open_file); |
| 2645 | rdata->offset = offset; |
| 2646 | rdata->bytes = cur_len; |
| 2647 | rdata->pid = pid; |
| 2648 | rdata->marshal_iov = cifs_uncached_read_marshal_iov; |
| 2649 | |
| 2650 | rc = cifs_retry_async_readv(rdata); |
| 2651 | error: |
| 2652 | if (rc) { |
| 2653 | kref_put(&rdata->refcount, |
| 2654 | cifs_uncached_readdata_release); |
| 2655 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2656 | } |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2657 | |
| 2658 | list_add_tail(&rdata->list, &rdata_list); |
| 2659 | offset += cur_len; |
| 2660 | len -= cur_len; |
| 2661 | } while (len > 0); |
| 2662 | |
| 2663 | /* if at least one read request send succeeded, then reset rc */ |
| 2664 | if (!list_empty(&rdata_list)) |
| 2665 | rc = 0; |
| 2666 | |
| 2667 | /* the loop below should proceed in the order of increasing offsets */ |
| 2668 | restart_loop: |
| 2669 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { |
| 2670 | if (!rc) { |
| 2671 | ssize_t copied; |
| 2672 | |
| 2673 | /* FIXME: freezable sleep too? */ |
| 2674 | rc = wait_for_completion_killable(&rdata->done); |
| 2675 | if (rc) |
| 2676 | rc = -EINTR; |
| 2677 | else if (rdata->result) |
| 2678 | rc = rdata->result; |
| 2679 | else { |
| 2680 | rc = cifs_readdata_to_iov(rdata, iov, |
| 2681 | nr_segs, *poffset, |
| 2682 | &copied); |
| 2683 | total_read += copied; |
| 2684 | } |
| 2685 | |
| 2686 | /* resend call if it's a retryable error */ |
| 2687 | if (rc == -EAGAIN) { |
| 2688 | rc = cifs_retry_async_readv(rdata); |
| 2689 | goto restart_loop; |
| 2690 | } |
| 2691 | } |
| 2692 | list_del_init(&rdata->list); |
| 2693 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2694 | } |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2695 | |
Jeff Layton | 1c89254 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2696 | cifs_stats_bytes_read(tcon, total_read); |
| 2697 | *poffset += total_read; |
| 2698 | |
| 2699 | return total_read ? total_read : rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | } |
| 2701 | |
Pavel Shilovsky | 0b81c1c | 2011-03-10 10:11:05 +0300 | [diff] [blame] | 2702 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2703 | unsigned long nr_segs, loff_t pos) |
| 2704 | { |
| 2705 | ssize_t read; |
| 2706 | |
| 2707 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); |
| 2708 | if (read > 0) |
| 2709 | iocb->ki_pos = pos; |
| 2710 | |
| 2711 | return read; |
| 2712 | } |
| 2713 | |
| 2714 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, |
| 2715 | unsigned long nr_segs, loff_t pos) |
| 2716 | { |
| 2717 | struct inode *inode; |
| 2718 | |
| 2719 | inode = iocb->ki_filp->f_path.dentry->d_inode; |
| 2720 | |
| 2721 | if (CIFS_I(inode)->clientCanCacheRead) |
| 2722 | return generic_file_aio_read(iocb, iov, nr_segs, pos); |
| 2723 | |
| 2724 | /* |
| 2725 | * In strict cache mode we need to read from the server all the time |
| 2726 | * if we don't have level II oplock because the server can delay mtime |
| 2727 | * change - so we can't make a decision about inode invalidating. |
| 2728 | * And we can also fail with pagereading if there are mandatory locks |
| 2729 | * on pages affected by this read but not on the region from pos to |
| 2730 | * pos+len-1. |
| 2731 | */ |
| 2732 | |
| 2733 | return cifs_user_readv(iocb, iov, nr_segs, pos); |
| 2734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | |
| 2736 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, |
Pavel Shilovsky | a70307e | 2010-12-14 11:50:41 +0300 | [diff] [blame] | 2737 | loff_t *poffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2738 | { |
| 2739 | int rc = -EACCES; |
| 2740 | unsigned int bytes_read = 0; |
| 2741 | unsigned int total_read; |
| 2742 | unsigned int current_read_size; |
Jeff Layton | 5eba8ab | 2011-10-19 15:30:26 -0400 | [diff] [blame] | 2743 | unsigned int rsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2744 | struct cifs_sb_info *cifs_sb; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 2745 | struct cifs_tcon *pTcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | int xid; |
| 2747 | char *current_offset; |
| 2748 | struct cifsFileInfo *open_file; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2749 | struct cifs_io_parms io_parms; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2750 | int buf_type = CIFS_NO_BUFFER; |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2751 | __u32 pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | |
| 2753 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 2754 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2755 | |
Jeff Layton | 5eba8ab | 2011-10-19 15:30:26 -0400 | [diff] [blame] | 2756 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
| 2757 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); |
| 2758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2760 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2761 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2762 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | } |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 2764 | open_file = file->private_data; |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 2765 | pTcon = tlink_tcon(open_file->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2767 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2768 | pid = open_file->pid; |
| 2769 | else |
| 2770 | pid = current->tgid; |
| 2771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2773 | cFYI(1, "attempting read on write only file instance"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2775 | for (total_read = 0, current_offset = read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | read_size > total_read; |
| 2777 | total_read += bytes_read, current_offset += bytes_read) { |
Jeff Layton | 5eba8ab | 2011-10-19 15:30:26 -0400 | [diff] [blame] | 2778 | current_read_size = min_t(uint, read_size - total_read, rsize); |
| 2779 | |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 2780 | /* For windows me and 9x we do not want to request more |
| 2781 | than it negotiated since it will refuse the read then */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2782 | if ((pTcon->ses) && |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 2783 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
Dan Carpenter | 7748dd6 | 2011-10-18 12:41:35 +0300 | [diff] [blame] | 2784 | current_read_size = min_t(uint, current_read_size, |
Jeff Layton | c974bef | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 2785 | CIFSMaxBufSize); |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 2786 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | rc = -EAGAIN; |
| 2788 | while (rc == -EAGAIN) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 2789 | if (open_file->invalidHandle) { |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 2790 | rc = cifs_reopen_file(open_file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | if (rc != 0) |
| 2792 | break; |
| 2793 | } |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2794 | io_parms.netfid = open_file->netfid; |
| 2795 | io_parms.pid = pid; |
| 2796 | io_parms.tcon = pTcon; |
| 2797 | io_parms.offset = *poffset; |
| 2798 | io_parms.length = current_read_size; |
| 2799 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, |
| 2800 | ¤t_offset, &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | } |
| 2802 | if (rc || (bytes_read == 0)) { |
| 2803 | if (total_read) { |
| 2804 | break; |
| 2805 | } else { |
| 2806 | FreeXid(xid); |
| 2807 | return rc; |
| 2808 | } |
| 2809 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 2810 | cifs_stats_bytes_read(pTcon, total_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | *poffset += bytes_read; |
| 2812 | } |
| 2813 | } |
| 2814 | FreeXid(xid); |
| 2815 | return total_read; |
| 2816 | } |
| 2817 | |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 2818 | /* |
| 2819 | * If the page is mmap'ed into a process' page tables, then we need to make |
| 2820 | * sure that it doesn't change while being written back. |
| 2821 | */ |
| 2822 | static int |
| 2823 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 2824 | { |
| 2825 | struct page *page = vmf->page; |
| 2826 | |
| 2827 | lock_page(page); |
| 2828 | return VM_FAULT_LOCKED; |
| 2829 | } |
| 2830 | |
| 2831 | static struct vm_operations_struct cifs_file_vm_ops = { |
| 2832 | .fault = filemap_fault, |
| 2833 | .page_mkwrite = cifs_page_mkwrite, |
| 2834 | }; |
| 2835 | |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 2836 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
| 2837 | { |
| 2838 | int rc, xid; |
| 2839 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2840 | |
| 2841 | xid = GetXid(); |
| 2842 | |
Pavel Shilovsky | 6feb989 | 2011-04-07 18:18:11 +0400 | [diff] [blame] | 2843 | if (!CIFS_I(inode)->clientCanCacheRead) { |
| 2844 | rc = cifs_invalidate_mapping(inode); |
| 2845 | if (rc) |
| 2846 | return rc; |
| 2847 | } |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 2848 | |
| 2849 | rc = generic_file_mmap(file, vma); |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 2850 | if (rc == 0) |
| 2851 | vma->vm_ops = &cifs_file_vm_ops; |
Pavel Shilovsky | 7a6a19b | 2010-12-14 11:29:51 +0300 | [diff] [blame] | 2852 | FreeXid(xid); |
| 2853 | return rc; |
| 2854 | } |
| 2855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2856 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 2857 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2858 | int rc, xid; |
| 2859 | |
| 2860 | xid = GetXid(); |
Jeff Layton | abab095 | 2010-02-12 07:44:18 -0500 | [diff] [blame] | 2861 | rc = cifs_revalidate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2862 | if (rc) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2863 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | FreeXid(xid); |
| 2865 | return rc; |
| 2866 | } |
| 2867 | rc = generic_file_mmap(file, vma); |
Jeff Layton | ca83ce3 | 2011-04-12 09:13:44 -0400 | [diff] [blame] | 2868 | if (rc == 0) |
| 2869 | vma->vm_ops = &cifs_file_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2870 | FreeXid(xid); |
| 2871 | return rc; |
| 2872 | } |
| 2873 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2874 | static void |
| 2875 | cifs_readv_complete(struct work_struct *work) |
| 2876 | { |
| 2877 | struct cifs_readdata *rdata = container_of(work, |
| 2878 | struct cifs_readdata, work); |
| 2879 | struct page *page, *tpage; |
| 2880 | |
| 2881 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { |
| 2882 | list_del(&page->lru); |
| 2883 | lru_cache_add_file(page); |
| 2884 | |
| 2885 | if (rdata->result == 0) { |
| 2886 | kunmap(page); |
| 2887 | flush_dcache_page(page); |
| 2888 | SetPageUptodate(page); |
| 2889 | } |
| 2890 | |
| 2891 | unlock_page(page); |
| 2892 | |
| 2893 | if (rdata->result == 0) |
| 2894 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
| 2895 | |
| 2896 | page_cache_release(page); |
| 2897 | } |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 2898 | kref_put(&rdata->refcount, cifs_readdata_release); |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2899 | } |
| 2900 | |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 2901 | static int |
| 2902 | cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining) |
| 2903 | { |
| 2904 | int len = 0; |
| 2905 | struct page *page, *tpage; |
| 2906 | u64 eof; |
| 2907 | pgoff_t eof_index; |
| 2908 | |
| 2909 | /* determine the eof that the server (probably) has */ |
| 2910 | eof = CIFS_I(rdata->mapping->host)->server_eof; |
| 2911 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; |
| 2912 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); |
| 2913 | |
| 2914 | rdata->nr_iov = 1; |
| 2915 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { |
| 2916 | if (remaining >= PAGE_CACHE_SIZE) { |
| 2917 | /* enough data to fill the page */ |
| 2918 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); |
| 2919 | rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE; |
| 2920 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
| 2921 | rdata->nr_iov, page->index, |
| 2922 | rdata->iov[rdata->nr_iov].iov_base, |
| 2923 | rdata->iov[rdata->nr_iov].iov_len); |
| 2924 | ++rdata->nr_iov; |
| 2925 | len += PAGE_CACHE_SIZE; |
| 2926 | remaining -= PAGE_CACHE_SIZE; |
| 2927 | } else if (remaining > 0) { |
| 2928 | /* enough for partial page, fill and zero the rest */ |
| 2929 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); |
| 2930 | rdata->iov[rdata->nr_iov].iov_len = remaining; |
| 2931 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
| 2932 | rdata->nr_iov, page->index, |
| 2933 | rdata->iov[rdata->nr_iov].iov_base, |
| 2934 | rdata->iov[rdata->nr_iov].iov_len); |
| 2935 | memset(rdata->iov[rdata->nr_iov].iov_base + remaining, |
| 2936 | '\0', PAGE_CACHE_SIZE - remaining); |
| 2937 | ++rdata->nr_iov; |
| 2938 | len += remaining; |
| 2939 | remaining = 0; |
| 2940 | } else if (page->index > eof_index) { |
| 2941 | /* |
| 2942 | * The VFS will not try to do readahead past the |
| 2943 | * i_size, but it's possible that we have outstanding |
| 2944 | * writes with gaps in the middle and the i_size hasn't |
| 2945 | * caught up yet. Populate those with zeroed out pages |
| 2946 | * to prevent the VFS from repeatedly attempting to |
| 2947 | * fill them until the writes are flushed. |
| 2948 | */ |
| 2949 | zero_user(page, 0, PAGE_CACHE_SIZE); |
| 2950 | list_del(&page->lru); |
| 2951 | lru_cache_add_file(page); |
| 2952 | flush_dcache_page(page); |
| 2953 | SetPageUptodate(page); |
| 2954 | unlock_page(page); |
| 2955 | page_cache_release(page); |
| 2956 | } else { |
| 2957 | /* no need to hold page hostage */ |
| 2958 | list_del(&page->lru); |
| 2959 | lru_cache_add_file(page); |
| 2960 | unlock_page(page); |
| 2961 | page_cache_release(page); |
| 2962 | } |
| 2963 | } |
| 2964 | |
| 2965 | return len; |
| 2966 | } |
| 2967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2968 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
| 2969 | struct list_head *page_list, unsigned num_pages) |
| 2970 | { |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 2971 | int rc; |
| 2972 | struct list_head tmplist; |
| 2973 | struct cifsFileInfo *open_file = file->private_data; |
| 2974 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
| 2975 | unsigned int rsize = cifs_sb->rsize; |
| 2976 | pid_t pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2977 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 2978 | /* |
| 2979 | * Give up immediately if rsize is too small to read an entire page. |
| 2980 | * The VFS will fall back to readpage. We should never reach this |
| 2981 | * point however since we set ra_pages to 0 when the rsize is smaller |
| 2982 | * than a cache page. |
| 2983 | */ |
| 2984 | if (unlikely(rsize < PAGE_CACHE_SIZE)) |
| 2985 | return 0; |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 2986 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 2987 | /* |
| 2988 | * Reads as many pages as possible from fscache. Returns -ENOBUFS |
| 2989 | * immediately if the cookie is negative |
| 2990 | */ |
| 2991 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, |
| 2992 | &num_pages); |
| 2993 | if (rc == 0) |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 2994 | return rc; |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 2995 | |
Pavel Shilovsky | d4ffff1 | 2011-05-26 06:02:00 +0000 | [diff] [blame] | 2996 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 2997 | pid = open_file->pid; |
| 2998 | else |
| 2999 | pid = current->tgid; |
| 3000 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3001 | rc = 0; |
| 3002 | INIT_LIST_HEAD(&tmplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3004 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
| 3005 | mapping, num_pages); |
| 3006 | |
| 3007 | /* |
| 3008 | * Start with the page at end of list and move it to private |
| 3009 | * list. Do the same with any following pages until we hit |
| 3010 | * the rsize limit, hit an index discontinuity, or run out of |
| 3011 | * pages. Issue the async read and then start the loop again |
| 3012 | * until the list is empty. |
| 3013 | * |
| 3014 | * Note that list order is important. The page_list is in |
| 3015 | * the order of declining indexes. When we put the pages in |
| 3016 | * the rdata->pages, then we want them in increasing order. |
| 3017 | */ |
| 3018 | while (!list_empty(page_list)) { |
| 3019 | unsigned int bytes = PAGE_CACHE_SIZE; |
| 3020 | unsigned int expected_index; |
| 3021 | unsigned int nr_pages = 1; |
| 3022 | loff_t offset; |
| 3023 | struct page *page, *tpage; |
| 3024 | struct cifs_readdata *rdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | |
| 3026 | page = list_entry(page_list->prev, struct page, lru); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3027 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3028 | /* |
| 3029 | * Lock the page and put it in the cache. Since no one else |
| 3030 | * should have access to this page, we're safe to simply set |
| 3031 | * PG_locked without checking it first. |
| 3032 | */ |
| 3033 | __set_page_locked(page); |
| 3034 | rc = add_to_page_cache_locked(page, mapping, |
| 3035 | page->index, GFP_KERNEL); |
| 3036 | |
| 3037 | /* give up if we can't stick it in the cache */ |
| 3038 | if (rc) { |
| 3039 | __clear_page_locked(page); |
| 3040 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3041 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3042 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3043 | /* move first page to the tmplist */ |
| 3044 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 3045 | list_move_tail(&page->lru, &tmplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3047 | /* now try and add more pages onto the request */ |
| 3048 | expected_index = page->index + 1; |
| 3049 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { |
| 3050 | /* discontinuity ? */ |
| 3051 | if (page->index != expected_index) |
| 3052 | break; |
| 3053 | |
| 3054 | /* would this page push the read over the rsize? */ |
| 3055 | if (bytes + PAGE_CACHE_SIZE > rsize) |
| 3056 | break; |
| 3057 | |
| 3058 | __set_page_locked(page); |
| 3059 | if (add_to_page_cache_locked(page, mapping, |
| 3060 | page->index, GFP_KERNEL)) { |
| 3061 | __clear_page_locked(page); |
| 3062 | break; |
| 3063 | } |
| 3064 | list_move_tail(&page->lru, &tmplist); |
| 3065 | bytes += PAGE_CACHE_SIZE; |
| 3066 | expected_index++; |
| 3067 | nr_pages++; |
| 3068 | } |
| 3069 | |
Jeff Layton | 0471ca3 | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3070 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3071 | if (!rdata) { |
| 3072 | /* best to give up if we're out of mem */ |
| 3073 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { |
| 3074 | list_del(&page->lru); |
| 3075 | lru_cache_add_file(page); |
| 3076 | unlock_page(page); |
| 3077 | page_cache_release(page); |
| 3078 | } |
| 3079 | rc = -ENOMEM; |
| 3080 | break; |
| 3081 | } |
| 3082 | |
| 3083 | spin_lock(&cifs_file_list_lock); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3084 | spin_unlock(&cifs_file_list_lock); |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3085 | rdata->cfile = cifsFileInfo_get(open_file); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3086 | rdata->mapping = mapping; |
| 3087 | rdata->offset = offset; |
| 3088 | rdata->bytes = bytes; |
| 3089 | rdata->pid = pid; |
Jeff Layton | 8d5ce4d | 2012-05-16 07:13:16 -0400 | [diff] [blame] | 3090 | rdata->marshal_iov = cifs_readpages_marshal_iov; |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3091 | list_splice_init(&tmplist, &rdata->pages); |
| 3092 | |
Jeff Layton | 2a1bb13 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3093 | rc = cifs_retry_async_readv(rdata); |
Jeff Layton | 690c5e3 | 2011-10-19 15:30:16 -0400 | [diff] [blame] | 3094 | if (rc != 0) { |
| 3095 | list_for_each_entry_safe(page, tpage, &rdata->pages, |
| 3096 | lru) { |
| 3097 | list_del(&page->lru); |
| 3098 | lru_cache_add_file(page); |
| 3099 | unlock_page(page); |
| 3100 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | } |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3102 | kref_put(&rdata->refcount, cifs_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3103 | break; |
| 3104 | } |
Jeff Layton | 6993f74 | 2012-05-16 07:13:17 -0400 | [diff] [blame] | 3105 | |
| 3106 | kref_put(&rdata->refcount, cifs_readdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3107 | } |
| 3108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3109 | return rc; |
| 3110 | } |
| 3111 | |
| 3112 | static int cifs_readpage_worker(struct file *file, struct page *page, |
| 3113 | loff_t *poffset) |
| 3114 | { |
| 3115 | char *read_data; |
| 3116 | int rc; |
| 3117 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3118 | /* Is the page cached? */ |
| 3119 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); |
| 3120 | if (rc == 0) |
| 3121 | goto read_complete; |
| 3122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3123 | page_cache_get(page); |
| 3124 | read_data = kmap(page); |
| 3125 | /* for reads over a certain size could initiate async read ahead */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3129 | if (rc < 0) |
| 3130 | goto io_error; |
| 3131 | else |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3132 | cFYI(1, "Bytes read %d", rc); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3133 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 3134 | file->f_path.dentry->d_inode->i_atime = |
| 3135 | current_fs_time(file->f_path.dentry->d_inode->i_sb); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3137 | if (PAGE_CACHE_SIZE > rc) |
| 3138 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); |
| 3139 | |
| 3140 | flush_dcache_page(page); |
| 3141 | SetPageUptodate(page); |
Suresh Jayaraman | 9dc0655 | 2010-07-05 18:13:11 +0530 | [diff] [blame] | 3142 | |
| 3143 | /* send this page to the cache */ |
| 3144 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); |
| 3145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | rc = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | io_error: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3149 | kunmap(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3150 | page_cache_release(page); |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 3151 | |
| 3152 | read_complete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3153 | return rc; |
| 3154 | } |
| 3155 | |
| 3156 | static int cifs_readpage(struct file *file, struct page *page) |
| 3157 | { |
| 3158 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 3159 | int rc = -EACCES; |
| 3160 | int xid; |
| 3161 | |
| 3162 | xid = GetXid(); |
| 3163 | |
| 3164 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3165 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3166 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 3167 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3168 | } |
| 3169 | |
Jeff Layton | ac3aa2f | 2012-07-23 13:14:28 -0400 | [diff] [blame] | 3170 | cFYI(1, "readpage %p at offset %d 0x%x", |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3171 | page, (int)offset, (int)offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | |
| 3173 | rc = cifs_readpage_worker(file, page, &offset); |
| 3174 | |
| 3175 | unlock_page(page); |
| 3176 | |
| 3177 | FreeXid(xid); |
| 3178 | return rc; |
| 3179 | } |
| 3180 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3181 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| 3182 | { |
| 3183 | struct cifsFileInfo *open_file; |
| 3184 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 3185 | spin_lock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3186 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 3187 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 3188 | spin_unlock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3189 | return 1; |
| 3190 | } |
| 3191 | } |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 3192 | spin_unlock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3193 | return 0; |
| 3194 | } |
| 3195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3196 | /* We do not want to update the file size from server for inodes |
| 3197 | open for write - to avoid races with writepage extending |
| 3198 | the file - in the future we could consider allowing |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3199 | refreshing the inode only on increases in the file size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3200 | but this is tricky to do without racing with writebehind |
| 3201 | page caching in the current Linux kernel design */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3202 | 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] | 3203 | { |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3204 | if (!cifsInode) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3205 | return true; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 3206 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 3207 | if (is_inode_writable(cifsInode)) { |
| 3208 | /* This inode is open for write at least once */ |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3209 | struct cifs_sb_info *cifs_sb; |
| 3210 | |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3211 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 3212 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3213 | /* since no page cache to corrupt on directio |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3214 | we can change size safely */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3215 | return true; |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 3216 | } |
| 3217 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 3218 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3219 | return true; |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 3220 | |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3221 | return false; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 3222 | } else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 3223 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | } |
| 3225 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3226 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
| 3227 | loff_t pos, unsigned len, unsigned flags, |
| 3228 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3229 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3230 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 3231 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3232 | loff_t page_start = pos & PAGE_MASK; |
| 3233 | loff_t i_size; |
| 3234 | struct page *page; |
| 3235 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3236 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3237 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3238 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 3239 | page = grab_cache_page_write_begin(mapping, index, flags); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3240 | if (!page) { |
| 3241 | rc = -ENOMEM; |
| 3242 | goto out; |
| 3243 | } |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3244 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3245 | if (PageUptodate(page)) |
| 3246 | goto out; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3247 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3248 | /* |
| 3249 | * If we write a full page it will be up to date, no need to read from |
| 3250 | * the server. If the write is short, we'll end up doing a sync write |
| 3251 | * instead. |
| 3252 | */ |
| 3253 | if (len == PAGE_CACHE_SIZE) |
| 3254 | goto out; |
| 3255 | |
| 3256 | /* |
| 3257 | * optimize away the read when we have an oplock, and we're not |
| 3258 | * expecting to use any of the data we'd be reading in. That |
| 3259 | * is, when the page lies beyond the EOF, or straddles the EOF |
| 3260 | * and the write will cover all of the existing data. |
| 3261 | */ |
| 3262 | if (CIFS_I(mapping->host)->clientCanCacheRead) { |
| 3263 | i_size = i_size_read(mapping->host); |
| 3264 | if (page_start >= i_size || |
| 3265 | (offset == 0 && (pos + len) >= i_size)) { |
| 3266 | zero_user_segments(page, 0, offset, |
| 3267 | offset + len, |
| 3268 | PAGE_CACHE_SIZE); |
| 3269 | /* |
| 3270 | * PageChecked means that the parts of the page |
| 3271 | * to which we're not writing are considered up |
| 3272 | * to date. Once the data is copied to the |
| 3273 | * page, it can be set uptodate. |
| 3274 | */ |
| 3275 | SetPageChecked(page); |
| 3276 | goto out; |
| 3277 | } |
| 3278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3280 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3281 | /* |
| 3282 | * might as well read a page, it is fast enough. If we get |
| 3283 | * an error, we don't need to return it. cifs_write_end will |
| 3284 | * do a sync write instead since PG_uptodate isn't set. |
| 3285 | */ |
| 3286 | cifs_readpage_worker(file, page, &page_start); |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3287 | } else { |
| 3288 | /* we could try using another file handle if there is one - |
| 3289 | but how would we lock it to prevent close of that handle |
| 3290 | racing with this read? In any case |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3291 | this will be written out by write_end so is fine */ |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 3292 | } |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 3293 | out: |
| 3294 | *pagep = page; |
| 3295 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3296 | } |
| 3297 | |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3298 | static int cifs_release_page(struct page *page, gfp_t gfp) |
| 3299 | { |
| 3300 | if (PagePrivate(page)) |
| 3301 | return 0; |
| 3302 | |
| 3303 | return cifs_fscache_release_page(page, gfp); |
| 3304 | } |
| 3305 | |
| 3306 | static void cifs_invalidate_page(struct page *page, unsigned long offset) |
| 3307 | { |
| 3308 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); |
| 3309 | |
| 3310 | if (offset == 0) |
| 3311 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
| 3312 | } |
| 3313 | |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3314 | static int cifs_launder_page(struct page *page) |
| 3315 | { |
| 3316 | int rc = 0; |
| 3317 | loff_t range_start = page_offset(page); |
| 3318 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
| 3319 | struct writeback_control wbc = { |
| 3320 | .sync_mode = WB_SYNC_ALL, |
| 3321 | .nr_to_write = 0, |
| 3322 | .range_start = range_start, |
| 3323 | .range_end = range_end, |
| 3324 | }; |
| 3325 | |
| 3326 | cFYI(1, "Launder page: %p", page); |
| 3327 | |
| 3328 | if (clear_page_dirty_for_io(page)) |
| 3329 | rc = cifs_writepage_locked(page, &wbc); |
| 3330 | |
| 3331 | cifs_fscache_invalidate_page(page, page->mapping->host); |
| 3332 | return rc; |
| 3333 | } |
| 3334 | |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 3335 | void cifs_oplock_break(struct work_struct *work) |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3336 | { |
| 3337 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 3338 | oplock_break); |
Jeff Layton | a5e18bc | 2010-10-11 15:07:18 -0400 | [diff] [blame] | 3339 | struct inode *inode = cfile->dentry->d_inode; |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3340 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 3341 | int rc = 0; |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3342 | |
| 3343 | if (inode && S_ISREG(inode->i_mode)) { |
Steve French | d54ff73 | 2010-04-27 04:38:15 +0000 | [diff] [blame] | 3344 | if (cinode->clientCanCacheRead) |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 3345 | break_lease(inode, O_RDONLY); |
Steve French | d54ff73 | 2010-04-27 04:38:15 +0000 | [diff] [blame] | 3346 | else |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 3347 | break_lease(inode, O_WRONLY); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3348 | rc = filemap_fdatawrite(inode->i_mapping); |
| 3349 | if (cinode->clientCanCacheRead == 0) { |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 3350 | rc = filemap_fdatawait(inode->i_mapping); |
| 3351 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3352 | invalidate_remote_inode(inode); |
| 3353 | } |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3354 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3355 | } |
| 3356 | |
Pavel Shilovsky | 85160e0 | 2011-10-22 15:33:29 +0400 | [diff] [blame] | 3357 | rc = cifs_push_locks(cfile); |
| 3358 | if (rc) |
| 3359 | cERROR(1, "Push locks rc = %d", rc); |
| 3360 | |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3361 | /* |
| 3362 | * releasing stale oplock after recent reconnect of smb session using |
| 3363 | * a now incorrect file handle is not a data integrity issue but do |
| 3364 | * not bother sending an oplock release if session to server still is |
| 3365 | * disconnected since oplock already released by the server |
| 3366 | */ |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 3367 | if (!cfile->oplock_break_cancelled) { |
Pavel Shilovsky | 03776f4 | 2010-08-17 11:26:00 +0400 | [diff] [blame] | 3368 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, |
| 3369 | current->tgid, 0, 0, 0, 0, |
| 3370 | LOCKING_ANDX_OPLOCK_RELEASE, false, |
Pavel Shilovsky | 12fed00 | 2011-01-17 20:15:44 +0300 | [diff] [blame] | 3371 | cinode->clientCanCacheRead ? 1 : 0); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 3372 | cFYI(1, "Oplock release rc = %d", rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3373 | } |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 3374 | } |
| 3375 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 3376 | const struct address_space_operations cifs_addr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3377 | .readpage = cifs_readpage, |
| 3378 | .readpages = cifs_readpages, |
| 3379 | .writepage = cifs_writepage, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 3380 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3381 | .write_begin = cifs_write_begin, |
| 3382 | .write_end = cifs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3383 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3384 | .releasepage = cifs_release_page, |
| 3385 | .invalidatepage = cifs_invalidate_page, |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3386 | .launder_page = cifs_launder_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3387 | }; |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3388 | |
| 3389 | /* |
| 3390 | * cifs_readpages requires the server to support a buffer large enough to |
| 3391 | * contain the header plus one complete page of data. Otherwise, we need |
| 3392 | * to leave cifs_readpages out of the address space operations. |
| 3393 | */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 3394 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3395 | .readpage = cifs_readpage, |
| 3396 | .writepage = cifs_writepage, |
| 3397 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 3398 | .write_begin = cifs_write_begin, |
| 3399 | .write_end = cifs_write_end, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3400 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 3401 | .releasepage = cifs_release_page, |
| 3402 | .invalidatepage = cifs_invalidate_page, |
Pavel Shilovsky | 9ad1506 | 2011-04-08 05:29:10 +0400 | [diff] [blame] | 3403 | .launder_page = cifs_launder_page, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 3404 | }; |