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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/div64.h> |
| 36 | #include "cifsfs.h" |
| 37 | #include "cifspdu.h" |
| 38 | #include "cifsglob.h" |
| 39 | #include "cifsproto.h" |
| 40 | #include "cifs_unicode.h" |
| 41 | #include "cifs_debug.h" |
| 42 | #include "cifs_fs_sb.h" |
Suresh Jayaraman | 9451a9a | 2010-07-05 18:12:45 +0530 | [diff] [blame] | 43 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | static inline int cifs_convert_flags(unsigned int flags) |
| 46 | { |
| 47 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 48 | return GENERIC_READ; |
| 49 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 50 | return GENERIC_WRITE; |
| 51 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 52 | /* GENERIC_ALL is too much permission to request |
| 53 | can cause unnecessary access denied on create */ |
| 54 | /* return GENERIC_ALL; */ |
| 55 | return (GENERIC_READ | GENERIC_WRITE); |
| 56 | } |
| 57 | |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
| 59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | |
| 60 | FILE_READ_DATA); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 61 | } |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 62 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 64 | { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 65 | u32 posix_flags = 0; |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 66 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 68 | posix_flags = SMB_O_RDONLY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 70 | posix_flags = SMB_O_WRONLY; |
| 71 | else if ((flags & O_ACCMODE) == O_RDWR) |
| 72 | posix_flags = SMB_O_RDWR; |
| 73 | |
| 74 | if (flags & O_CREAT) |
| 75 | posix_flags |= SMB_O_CREAT; |
| 76 | if (flags & O_EXCL) |
| 77 | posix_flags |= SMB_O_EXCL; |
| 78 | if (flags & O_TRUNC) |
| 79 | posix_flags |= SMB_O_TRUNC; |
| 80 | /* be safe and imply O_SYNC for O_DSYNC */ |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 81 | if (flags & O_DSYNC) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 82 | posix_flags |= SMB_O_SYNC; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 83 | if (flags & O_DIRECTORY) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 84 | posix_flags |= SMB_O_DIRECTORY; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 85 | if (flags & O_NOFOLLOW) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 86 | posix_flags |= SMB_O_NOFOLLOW; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 87 | if (flags & O_DIRECT) |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 88 | posix_flags |= SMB_O_DIRECT; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 89 | |
| 90 | return posix_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | static inline int cifs_get_disposition(unsigned int flags) |
| 94 | { |
| 95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 96 | return FILE_CREATE; |
| 97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 98 | return FILE_OVERWRITE_IF; |
| 99 | else if ((flags & O_CREAT) == O_CREAT) |
| 100 | return FILE_OPEN_IF; |
Steve French | 55aa2e0 | 2006-05-30 18:09:31 +0000 | [diff] [blame] | 101 | else if ((flags & O_TRUNC) == O_TRUNC) |
| 102 | return FILE_OVERWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | else |
| 104 | return FILE_OPEN; |
| 105 | } |
| 106 | |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 107 | int cifs_posix_open(char *full_path, struct inode **pinode, |
| 108 | struct super_block *sb, int mode, unsigned int f_flags, |
| 109 | __u32 *poplock, __u16 *pnetfid, int xid) |
| 110 | { |
| 111 | int rc; |
| 112 | FILE_UNIX_BASIC_INFO *presp_data; |
| 113 | __u32 posix_flags = 0; |
| 114 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 115 | struct cifs_fattr fattr; |
| 116 | struct tcon_link *tlink; |
| 117 | struct cifsTconInfo *tcon; |
| 118 | |
| 119 | cFYI(1, "posix open %s", full_path); |
| 120 | |
| 121 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); |
| 122 | if (presp_data == NULL) |
| 123 | return -ENOMEM; |
| 124 | |
| 125 | tlink = cifs_sb_tlink(cifs_sb); |
| 126 | if (IS_ERR(tlink)) { |
| 127 | rc = PTR_ERR(tlink); |
| 128 | goto posix_open_ret; |
| 129 | } |
| 130 | |
| 131 | tcon = tlink_tcon(tlink); |
| 132 | mode &= ~current_umask(); |
| 133 | |
| 134 | posix_flags = cifs_posix_convert_flags(f_flags); |
| 135 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, |
| 136 | poplock, full_path, cifs_sb->local_nls, |
| 137 | cifs_sb->mnt_cifs_flags & |
| 138 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 139 | cifs_put_tlink(tlink); |
| 140 | |
| 141 | if (rc) |
| 142 | goto posix_open_ret; |
| 143 | |
| 144 | if (presp_data->Type == cpu_to_le32(-1)) |
| 145 | goto posix_open_ret; /* open ok, caller does qpathinfo */ |
| 146 | |
| 147 | if (!pinode) |
| 148 | goto posix_open_ret; /* caller does not need info */ |
| 149 | |
| 150 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); |
| 151 | |
| 152 | /* get new inode and set it up */ |
| 153 | if (*pinode == NULL) { |
| 154 | cifs_fill_uniqueid(sb, &fattr); |
| 155 | *pinode = cifs_iget(sb, &fattr); |
| 156 | if (!*pinode) { |
| 157 | rc = -ENOMEM; |
| 158 | goto posix_open_ret; |
| 159 | } |
| 160 | } else { |
| 161 | cifs_fattr_to_inode(*pinode, &fattr); |
| 162 | } |
| 163 | |
| 164 | posix_open_ret: |
| 165 | kfree(presp_data); |
| 166 | return rc; |
| 167 | } |
| 168 | |
Pavel Shilovsky | eeb910a | 2010-11-25 15:12:39 +0300 | [diff] [blame] | 169 | static int |
| 170 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, |
| 171 | struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock, |
| 172 | __u16 *pnetfid, int xid) |
| 173 | { |
| 174 | int rc; |
| 175 | int desiredAccess; |
| 176 | int disposition; |
| 177 | FILE_ALL_INFO *buf; |
| 178 | |
| 179 | desiredAccess = cifs_convert_flags(f_flags); |
| 180 | |
| 181 | /********************************************************************* |
| 182 | * open flag mapping table: |
| 183 | * |
| 184 | * POSIX Flag CIFS Disposition |
| 185 | * ---------- ---------------- |
| 186 | * O_CREAT FILE_OPEN_IF |
| 187 | * O_CREAT | O_EXCL FILE_CREATE |
| 188 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| 189 | * O_TRUNC FILE_OVERWRITE |
| 190 | * none of the above FILE_OPEN |
| 191 | * |
| 192 | * Note that there is not a direct match between disposition |
| 193 | * FILE_SUPERSEDE (ie create whether or not file exists although |
| 194 | * O_CREAT | O_TRUNC is similar but truncates the existing |
| 195 | * file rather than creating a new file as FILE_SUPERSEDE does |
| 196 | * (which uses the attributes / metadata passed in on open call) |
| 197 | *? |
| 198 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
| 199 | *? and the read write flags match reasonably. O_LARGEFILE |
| 200 | *? is irrelevant because largefile support is always used |
| 201 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| 202 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| 203 | *********************************************************************/ |
| 204 | |
| 205 | disposition = cifs_get_disposition(f_flags); |
| 206 | |
| 207 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
| 208 | |
| 209 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 210 | if (!buf) |
| 211 | return -ENOMEM; |
| 212 | |
| 213 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
| 214 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
| 215 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, |
| 216 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 217 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 218 | else |
| 219 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
| 220 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, |
| 221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 223 | |
| 224 | if (rc) |
| 225 | goto out; |
| 226 | |
| 227 | if (tcon->unix_ext) |
| 228 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
| 229 | xid); |
| 230 | else |
| 231 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
| 232 | xid, pnetfid); |
| 233 | |
| 234 | out: |
| 235 | kfree(buf); |
| 236 | return rc; |
| 237 | } |
| 238 | |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 239 | struct cifsFileInfo * |
| 240 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, |
| 241 | struct tcon_link *tlink, __u32 oplock) |
| 242 | { |
| 243 | struct dentry *dentry = file->f_path.dentry; |
| 244 | struct inode *inode = dentry->d_inode; |
| 245 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
| 246 | struct cifsFileInfo *pCifsFile; |
| 247 | |
| 248 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| 249 | if (pCifsFile == NULL) |
| 250 | return pCifsFile; |
| 251 | |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 252 | pCifsFile->count = 1; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 253 | pCifsFile->netfid = fileHandle; |
| 254 | pCifsFile->pid = current->tgid; |
| 255 | pCifsFile->uid = current_fsuid(); |
| 256 | pCifsFile->dentry = dget(dentry); |
| 257 | pCifsFile->f_flags = file->f_flags; |
| 258 | pCifsFile->invalidHandle = false; |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 259 | pCifsFile->tlink = cifs_get_tlink(tlink); |
| 260 | mutex_init(&pCifsFile->fh_mutex); |
| 261 | mutex_init(&pCifsFile->lock_mutex); |
| 262 | INIT_LIST_HEAD(&pCifsFile->llist); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 263 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
| 264 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 265 | spin_lock(&cifs_file_list_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 266 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
| 267 | /* if readable file instance put first in list*/ |
| 268 | if (file->f_mode & FMODE_READ) |
| 269 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); |
| 270 | else |
| 271 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 272 | spin_unlock(&cifs_file_list_lock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 273 | |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 274 | cifs_set_oplock_level(pCifsInode, oplock); |
Jeff Layton | 15ecb43 | 2010-10-15 15:34:02 -0400 | [diff] [blame] | 275 | |
| 276 | file->private_data = pCifsFile; |
| 277 | return pCifsFile; |
| 278 | } |
| 279 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 280 | /* |
| 281 | * Release a reference on the file private data. This may involve closing |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 282 | * the filehandle out on the server. Must be called without holding |
| 283 | * cifs_file_list_lock. |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 284 | */ |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 285 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
| 286 | { |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 287 | struct inode *inode = cifs_file->dentry->d_inode; |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 288 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 289 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 290 | struct cifsLockInfo *li, *tmp; |
| 291 | |
| 292 | spin_lock(&cifs_file_list_lock); |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 293 | if (--cifs_file->count > 0) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 294 | spin_unlock(&cifs_file_list_lock); |
| 295 | return; |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 296 | } |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 297 | |
| 298 | /* remove it from the lists */ |
| 299 | list_del(&cifs_file->flist); |
| 300 | list_del(&cifs_file->tlist); |
| 301 | |
| 302 | if (list_empty(&cifsi->openFileList)) { |
| 303 | cFYI(1, "closing last open instance for inode %p", |
| 304 | cifs_file->dentry->d_inode); |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 305 | cifs_set_oplock_level(cifsi, 0); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 306 | } |
| 307 | spin_unlock(&cifs_file_list_lock); |
| 308 | |
| 309 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
| 310 | int xid, rc; |
| 311 | |
| 312 | xid = GetXid(); |
| 313 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); |
| 314 | FreeXid(xid); |
| 315 | } |
| 316 | |
| 317 | /* Delete any outstanding lock records. We'll lose them when the file |
| 318 | * is closed anyway. |
| 319 | */ |
| 320 | mutex_lock(&cifs_file->lock_mutex); |
| 321 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { |
| 322 | list_del(&li->llist); |
| 323 | kfree(li); |
| 324 | } |
| 325 | mutex_unlock(&cifs_file->lock_mutex); |
| 326 | |
| 327 | cifs_put_tlink(cifs_file->tlink); |
| 328 | dput(cifs_file->dentry); |
| 329 | kfree(cifs_file); |
Jeff Layton | b33879a | 2010-10-15 15:34:04 -0400 | [diff] [blame] | 330 | } |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | int cifs_open(struct inode *inode, struct file *file) |
| 333 | { |
| 334 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 335 | int xid; |
| 336 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | struct cifs_sb_info *cifs_sb; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 338 | struct cifsTconInfo *tcon; |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 339 | struct tcon_link *tlink; |
Jeff Layton | 6ca9f3b | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 340 | struct cifsFileInfo *pCifsFile = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | struct cifsInodeInfo *pCifsInode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | char *full_path = NULL; |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 343 | bool posix_open_ok = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | __u16 netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | xid = GetXid(); |
| 347 | |
| 348 | cifs_sb = CIFS_SB(inode->i_sb); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 349 | tlink = cifs_sb_tlink(cifs_sb); |
| 350 | if (IS_ERR(tlink)) { |
| 351 | FreeXid(xid); |
| 352 | return PTR_ERR(tlink); |
| 353 | } |
| 354 | tcon = tlink_tcon(tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
Steve French | a6ce493 | 2009-04-09 01:14:32 +0000 | [diff] [blame] | 356 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 358 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (full_path == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 360 | rc = -ENOMEM; |
Jeff Layton | 232341b | 2010-08-05 13:58:38 -0400 | [diff] [blame] | 361 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 364 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
| 365 | inode, file->f_flags, full_path); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 366 | |
| 367 | if (oplockEnabled) |
| 368 | oplock = REQ_OPLOCK; |
| 369 | else |
| 370 | oplock = 0; |
| 371 | |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 372 | if (!tcon->broken_posix_open && tcon->unix_ext && |
| 373 | (tcon->ses->capabilities & CAP_UNIX) && |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 374 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 375 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 376 | /* can not refresh inode info since size could be stale */ |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 377 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
Steve French | fa588e0 | 2010-04-22 19:21:55 +0000 | [diff] [blame] | 378 | cifs_sb->mnt_file_mode /* ignored */, |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 379 | file->f_flags, &oplock, &netfid, xid); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 380 | if (rc == 0) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 381 | cFYI(1, "posix open succeeded"); |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 382 | posix_open_ok = true; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 383 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
| 384 | if (tcon->ses->serverNOS) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 385 | cERROR(1, "server %s of type %s returned" |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 386 | " unexpected error on SMB posix open" |
| 387 | ", disabling posix open support." |
| 388 | " Check if server update available.", |
| 389 | tcon->ses->serverName, |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 390 | tcon->ses->serverNOS); |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 391 | tcon->broken_posix_open = true; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 392 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
| 393 | (rc != -EOPNOTSUPP)) /* path not found or net err */ |
| 394 | goto out; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 395 | /* else fallthrough to retry open the old way on network i/o |
| 396 | or DFS errors */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 397 | } |
| 398 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 399 | if (!posix_open_ok) { |
| 400 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
| 401 | file->f_flags, &oplock, &netfid, xid); |
| 402 | if (rc) |
| 403 | goto out; |
| 404 | } |
Jeff Layton | 47c78b7 | 2010-06-16 13:40:17 -0400 | [diff] [blame] | 405 | |
Jeff Layton | abfe1ee | 2010-10-15 15:33:58 -0400 | [diff] [blame] | 406 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
Jeff Layton | 6ca9f3b | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 407 | if (pCifsFile == NULL) { |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 408 | CIFSSMBClose(xid, tcon, netfid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | rc = -ENOMEM; |
| 410 | goto out; |
| 411 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Suresh Jayaraman | 9451a9a | 2010-07-05 18:12:45 +0530 | [diff] [blame] | 413 | cifs_fscache_set_inode_cookie(inode, file); |
| 414 | |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 415 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | /* time to set mode which we can not set earlier due to |
| 417 | problems creating new read-only files */ |
Pavel Shilovsky | 7e12edd | 2010-11-25 17:20:20 +0300 | [diff] [blame^] | 418 | struct cifs_unix_set_info_args args = { |
| 419 | .mode = inode->i_mode, |
| 420 | .uid = NO_CHANGE_64, |
| 421 | .gid = NO_CHANGE_64, |
| 422 | .ctime = NO_CHANGE_64, |
| 423 | .atime = NO_CHANGE_64, |
| 424 | .mtime = NO_CHANGE_64, |
| 425 | .device = 0, |
| 426 | }; |
| 427 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
| 428 | cifs_sb->local_nls, |
| 429 | cifs_sb->mnt_cifs_flags & |
| 430 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | kfree(full_path); |
| 435 | FreeXid(xid); |
Jeff Layton | 7ffec37 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 436 | cifs_put_tlink(tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | return rc; |
| 438 | } |
| 439 | |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 440 | /* Try to reacquire byte range locks that were released when session */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | /* to server was lost */ |
| 442 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
| 443 | { |
| 444 | int rc = 0; |
| 445 | |
| 446 | /* BB list all locks open on this file and relock */ |
| 447 | |
| 448 | return rc; |
| 449 | } |
| 450 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 451 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
| 453 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 454 | int xid; |
| 455 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | struct cifs_sb_info *cifs_sb; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 457 | struct cifsTconInfo *tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | struct cifsInodeInfo *pCifsInode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 459 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | char *full_path = NULL; |
| 461 | int desiredAccess; |
| 462 | int disposition = FILE_OPEN; |
| 463 | __u16 netfid; |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | xid = GetXid(); |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 466 | mutex_lock(&pCifsFile->fh_mutex); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 467 | if (!pCifsFile->invalidHandle) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 468 | mutex_unlock(&pCifsFile->fh_mutex); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 469 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 471 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 474 | inode = pCifsFile->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | cifs_sb = CIFS_SB(inode->i_sb); |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 476 | tcon = tlink_tcon(pCifsFile->tlink); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | /* can not grab rename sem here because various ops, including |
| 479 | those that already have the rename sem can end up causing writepage |
| 480 | to get called and if the server was down that means we end up here, |
| 481 | 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] | 482 | full_path = build_path_from_dentry(pCifsFile->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (full_path == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 484 | rc = -ENOMEM; |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 485 | mutex_unlock(&pCifsFile->fh_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | FreeXid(xid); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 487 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 490 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 491 | inode, pCifsFile->f_flags, full_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
| 493 | if (oplockEnabled) |
| 494 | oplock = REQ_OPLOCK; |
| 495 | else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 496 | oplock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 498 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
| 499 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 500 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 501 | |
| 502 | /* |
| 503 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the |
| 504 | * original open. Must mask them off for a reopen. |
| 505 | */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 506 | unsigned int oflags = pCifsFile->f_flags & |
| 507 | ~(O_CREAT | O_EXCL | O_TRUNC); |
Jeff Layton | 608712f | 2010-10-15 15:33:56 -0400 | [diff] [blame] | 508 | |
Jeff Layton | 2422f67 | 2010-06-16 13:40:16 -0400 | [diff] [blame] | 509 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
Steve French | fa588e0 | 2010-04-22 19:21:55 +0000 | [diff] [blame] | 510 | cifs_sb->mnt_file_mode /* ignored */, |
| 511 | oflags, &oplock, &netfid, xid); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 512 | if (rc == 0) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 513 | cFYI(1, "posix reopen succeeded"); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 514 | goto reopen_success; |
| 515 | } |
| 516 | /* fallthrough to retry open the old way on errors, especially |
| 517 | in the reconnect path it is important to retry hard */ |
| 518 | } |
| 519 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 520 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | /* 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] | 523 | by SMBOpen and then calling get_inode_info with returned buf |
| 524 | since file might have write behind data that needs to be flushed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | and server version of file size can be stale. If we knew for sure |
| 526 | that inode was not dirty locally we could do this */ |
| 527 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 528 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 530 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 531 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | if (rc) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 533 | mutex_unlock(&pCifsFile->fh_mutex); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 534 | cFYI(1, "cifs_open returned 0x%x", rc); |
| 535 | cFYI(1, "oplock: %d", oplock); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 536 | goto reopen_error_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 538 | |
| 539 | reopen_success: |
| 540 | pCifsFile->netfid = netfid; |
| 541 | pCifsFile->invalidHandle = false; |
| 542 | mutex_unlock(&pCifsFile->fh_mutex); |
| 543 | pCifsInode = CIFS_I(inode); |
| 544 | |
| 545 | if (can_flush) { |
| 546 | rc = filemap_write_and_wait(inode->i_mapping); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 547 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 548 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 549 | if (tcon->unix_ext) |
| 550 | rc = cifs_get_inode_info_unix(&inode, |
| 551 | full_path, inode->i_sb, xid); |
| 552 | else |
| 553 | rc = cifs_get_inode_info(&inode, |
| 554 | full_path, NULL, inode->i_sb, |
| 555 | xid, NULL); |
| 556 | } /* else we are writing out data to server already |
| 557 | and could deadlock if we tried to flush data, and |
| 558 | since we do not know if we have data that would |
| 559 | invalidate the current end of file on the server |
| 560 | we can not go to the server to get the new inod |
| 561 | info */ |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 562 | |
Pavel Shilovsky | c672362 | 2010-11-03 10:58:57 +0300 | [diff] [blame] | 563 | cifs_set_oplock_level(pCifsInode, oplock); |
Pavel Shilovsky | e66673e | 2010-11-02 12:00:42 +0300 | [diff] [blame] | 564 | |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 565 | cifs_relock_file(pCifsFile); |
| 566 | |
| 567 | reopen_error_exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | kfree(full_path); |
| 569 | FreeXid(xid); |
| 570 | return rc; |
| 571 | } |
| 572 | |
| 573 | int cifs_close(struct inode *inode, struct file *file) |
| 574 | { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 575 | cifsFileInfo_put(file->private_data); |
| 576 | file->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 578 | /* return code from the ->release op is always ignored */ |
| 579 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | int cifs_closedir(struct inode *inode, struct file *file) |
| 583 | { |
| 584 | int rc = 0; |
| 585 | int xid; |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 586 | struct cifsFileInfo *pCFileStruct = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | char *ptmp; |
| 588 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 589 | cFYI(1, "Closedir inode = 0x%p", inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
| 591 | xid = GetXid(); |
| 592 | |
| 593 | if (pCFileStruct) { |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 594 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 596 | cFYI(1, "Freeing private data in close dir"); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 597 | spin_lock(&cifs_file_list_lock); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 598 | if (!pCFileStruct->srch_inf.endOfSearch && |
| 599 | !pCFileStruct->invalidHandle) { |
| 600 | pCFileStruct->invalidHandle = true; |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 601 | spin_unlock(&cifs_file_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 603 | cFYI(1, "Closing uncompleted readdir with rc %d", |
| 604 | rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | /* not much we can do if it fails anyway, ignore rc */ |
| 606 | rc = 0; |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 607 | } else |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 608 | spin_unlock(&cifs_file_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
| 610 | if (ptmp) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 611 | cFYI(1, "closedir free smb buf in srch struct"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 613 | if (pCFileStruct->srch_inf.smallBuf) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 614 | cifs_small_buf_release(ptmp); |
| 615 | else |
| 616 | cifs_buf_release(ptmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 618 | cifs_put_tlink(pCFileStruct->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | kfree(file->private_data); |
| 620 | file->private_data = NULL; |
| 621 | } |
| 622 | /* BB can we lock the filestruct while this is going on? */ |
| 623 | FreeXid(xid); |
| 624 | return rc; |
| 625 | } |
| 626 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 627 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
| 628 | __u64 offset, __u8 lockType) |
| 629 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 630 | struct cifsLockInfo *li = |
| 631 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 632 | if (li == NULL) |
| 633 | return -ENOMEM; |
| 634 | li->offset = offset; |
| 635 | li->length = len; |
| 636 | li->type = lockType; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 637 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 638 | list_add(&li->llist, &fid->llist); |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 639 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 640 | return 0; |
| 641 | } |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
| 644 | { |
| 645 | int rc, xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | __u32 numLock = 0; |
| 647 | __u32 numUnlock = 0; |
| 648 | __u64 length; |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 649 | bool wait_flag = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | struct cifs_sb_info *cifs_sb; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 651 | struct cifsTconInfo *tcon; |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 652 | __u16 netfid; |
| 653 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 654 | bool posix_locking = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | length = 1 + pfLock->fl_end - pfLock->fl_start; |
| 657 | rc = -EACCES; |
| 658 | xid = GetXid(); |
| 659 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 660 | cFYI(1, "Lock parm: 0x%x flockflags: " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 662 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 663 | pfLock->fl_end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | if (pfLock->fl_flags & FL_POSIX) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 666 | cFYI(1, "Posix"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | if (pfLock->fl_flags & FL_FLOCK) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 668 | cFYI(1, "Flock"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | if (pfLock->fl_flags & FL_SLEEP) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 670 | cFYI(1, "Blocking lock"); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 671 | wait_flag = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
| 673 | if (pfLock->fl_flags & FL_ACCESS) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 674 | cFYI(1, "Process suspended by mandatory locking - " |
| 675 | "not implemented yet"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (pfLock->fl_flags & FL_LEASE) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 677 | cFYI(1, "Lease on file - not implemented yet"); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 678 | if (pfLock->fl_flags & |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 680 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | if (pfLock->fl_type == F_WRLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 683 | cFYI(1, "F_WRLCK "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | numLock = 1; |
| 685 | } else if (pfLock->fl_type == F_UNLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 686 | cFYI(1, "F_UNLCK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | numUnlock = 1; |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 688 | /* Check if unlock includes more than |
| 689 | one lock range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | } else if (pfLock->fl_type == F_RDLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 691 | cFYI(1, "F_RDLCK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 693 | numLock = 1; |
| 694 | } else if (pfLock->fl_type == F_EXLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 695 | cFYI(1, "F_EXLCK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | numLock = 1; |
| 697 | } else if (pfLock->fl_type == F_SHLCK) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 698 | cFYI(1, "F_SHLCK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 700 | numLock = 1; |
| 701 | } else |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 702 | cFYI(1, "Unknown type of lock"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 704 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 705 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 706 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 708 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 709 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
Steve French | acc18aa | 2008-12-02 18:53:55 +0000 | [diff] [blame] | 710 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 711 | posix_locking = 1; |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 712 | /* BB add code here to normalize offset and length to |
| 713 | account for negative length which we can not accept over the |
| 714 | wire */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if (IS_GETLK(cmd)) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 716 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 717 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 718 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 719 | posix_lock_type = CIFS_RDLCK; |
| 720 | else |
| 721 | posix_lock_type = CIFS_WRLCK; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 722 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 723 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 724 | posix_lock_type, wait_flag); |
| 725 | FreeXid(xid); |
| 726 | return rc; |
| 727 | } |
| 728 | |
| 729 | /* BB we could chain these into one lock request BB */ |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 730 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 731 | 0, 1, lockType, 0 /* wait flag */ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | if (rc == 0) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 733 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | pfLock->fl_start, 1 /* numUnlock */ , |
| 735 | 0 /* numLock */ , lockType, |
| 736 | 0 /* wait flag */ ); |
| 737 | pfLock->fl_type = F_UNLCK; |
| 738 | if (rc != 0) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 739 | cERROR(1, "Error unlocking previously locked " |
| 740 | "range %d during test of lock", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | rc = 0; |
| 742 | |
| 743 | } else { |
| 744 | /* if rc == ERR_SHARING_VIOLATION ? */ |
Pavel Shilovsky | f05337c | 2010-04-05 09:59:14 +0400 | [diff] [blame] | 745 | rc = 0; |
| 746 | |
| 747 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { |
| 748 | pfLock->fl_type = F_WRLCK; |
| 749 | } else { |
| 750 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
| 751 | pfLock->fl_start, 0, 1, |
| 752 | lockType | LOCKING_ANDX_SHARED_LOCK, |
| 753 | 0 /* wait flag */); |
| 754 | if (rc == 0) { |
| 755 | rc = CIFSSMBLock(xid, tcon, netfid, |
| 756 | length, pfLock->fl_start, 1, 0, |
| 757 | lockType | |
| 758 | LOCKING_ANDX_SHARED_LOCK, |
| 759 | 0 /* wait flag */); |
| 760 | pfLock->fl_type = F_RDLCK; |
| 761 | if (rc != 0) |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 762 | cERROR(1, "Error unlocking " |
Pavel Shilovsky | f05337c | 2010-04-05 09:59:14 +0400 | [diff] [blame] | 763 | "previously locked range %d " |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 764 | "during test of lock", rc); |
Pavel Shilovsky | f05337c | 2010-04-05 09:59:14 +0400 | [diff] [blame] | 765 | rc = 0; |
| 766 | } else { |
| 767 | pfLock->fl_type = F_WRLCK; |
| 768 | rc = 0; |
| 769 | } |
| 770 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | FreeXid(xid); |
| 774 | return rc; |
| 775 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 776 | |
| 777 | if (!numLock && !numUnlock) { |
| 778 | /* if no lock or unlock then nothing |
| 779 | to do since we do not know what it is */ |
| 780 | FreeXid(xid); |
| 781 | return -EOPNOTSUPP; |
| 782 | } |
| 783 | |
| 784 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 785 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 786 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 787 | posix_lock_type = CIFS_RDLCK; |
| 788 | else |
| 789 | posix_lock_type = CIFS_WRLCK; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 790 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 791 | if (numUnlock == 1) |
Steve French | beb84dc | 2006-03-03 23:36:34 +0000 | [diff] [blame] | 792 | posix_lock_type = CIFS_UNLCK; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 793 | |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 794 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 795 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 796 | posix_lock_type, wait_flag); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 797 | } else { |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 798 | struct cifsFileInfo *fid = file->private_data; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 799 | |
| 800 | if (numLock) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 801 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 802 | pfLock->fl_start, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 803 | 0, numLock, lockType, wait_flag); |
| 804 | |
| 805 | if (rc == 0) { |
| 806 | /* For Windows locks we must store them. */ |
| 807 | rc = store_file_lock(fid, length, |
| 808 | pfLock->fl_start, lockType); |
| 809 | } |
| 810 | } else if (numUnlock) { |
| 811 | /* For each stored lock that this unlock overlaps |
| 812 | completely, unlock it. */ |
| 813 | int stored_rc = 0; |
| 814 | struct cifsLockInfo *li, *tmp; |
| 815 | |
Steve French | 6b70c95 | 2006-09-21 07:35:29 +0000 | [diff] [blame] | 816 | rc = 0; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 817 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 818 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
| 819 | if (pfLock->fl_start <= li->offset && |
Steve French | c19eb71 | 2007-08-24 03:22:48 +0000 | [diff] [blame] | 820 | (pfLock->fl_start + length) >= |
Jeff Layton | 39db810 | 2007-08-24 03:16:51 +0000 | [diff] [blame] | 821 | (li->offset + li->length)) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 822 | stored_rc = CIFSSMBLock(xid, tcon, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 823 | netfid, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 824 | li->length, li->offset, |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 825 | 1, 0, li->type, false); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 826 | if (stored_rc) |
| 827 | rc = stored_rc; |
Pavel Shilovsky | 2c964d1 | 2010-04-21 19:44:24 +0000 | [diff] [blame] | 828 | else { |
| 829 | list_del(&li->llist); |
| 830 | kfree(li); |
| 831 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 832 | } |
| 833 | } |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 834 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 835 | } |
| 836 | } |
| 837 | |
Steve French | d634cc1 | 2005-08-26 14:42:59 -0500 | [diff] [blame] | 838 | if (pfLock->fl_flags & FL_POSIX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | posix_lock_file_wait(file, pfLock); |
| 840 | FreeXid(xid); |
| 841 | return rc; |
| 842 | } |
| 843 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 844 | /* |
| 845 | * Set the timeout on write requests past EOF. For some servers (Windows) |
| 846 | * these calls can be very long. |
| 847 | * |
| 848 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less |
| 849 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. |
| 850 | * The 10M cutoff is totally arbitrary. A better scheme for this would be |
| 851 | * welcome if someone wants to suggest one. |
| 852 | * |
| 853 | * We may be able to do a better job with this if there were some way to |
| 854 | * declare that a file should be sparse. |
| 855 | */ |
| 856 | static int |
| 857 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) |
| 858 | { |
| 859 | if (offset <= cifsi->server_eof) |
| 860 | return CIFS_STD_OP; |
| 861 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) |
| 862 | return CIFS_VLONG_OP; |
| 863 | else |
| 864 | return CIFS_LONG_OP; |
| 865 | } |
| 866 | |
| 867 | /* update the file size (if needed) after a write */ |
| 868 | static void |
| 869 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
| 870 | unsigned int bytes_written) |
| 871 | { |
| 872 | loff_t end_of_write = offset + bytes_written; |
| 873 | |
| 874 | if (end_of_write > cifsi->server_eof) |
| 875 | cifsi->server_eof = end_of_write; |
| 876 | } |
| 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
| 879 | size_t write_size, loff_t *poffset) |
| 880 | { |
Jiri Slaby | 50ae28f | 2010-11-01 16:08:55 +0100 | [diff] [blame] | 881 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | int rc = 0; |
| 883 | unsigned int bytes_written = 0; |
| 884 | unsigned int total_written; |
| 885 | struct cifs_sb_info *cifs_sb; |
| 886 | struct cifsTconInfo *pTcon; |
| 887 | int xid, long_op; |
| 888 | struct cifsFileInfo *open_file; |
Jiri Slaby | 50ae28f | 2010-11-01 16:08:55 +0100 | [diff] [blame] | 889 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 891 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 893 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
| 894 | *poffset, file->f_path.dentry->d_name.name); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | if (file->private_data == NULL) |
| 897 | return -EBADF; |
Jeff Layton | ba00ba6 | 2010-09-20 16:01:31 -0700 | [diff] [blame] | 898 | |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 899 | open_file = file->private_data; |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 900 | pTcon = tlink_tcon(open_file->tlink); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 901 | |
Jeff Layton | 838726c | 2008-08-28 07:54:59 -0400 | [diff] [blame] | 902 | rc = generic_write_checks(file, poffset, &write_size, 0); |
| 903 | if (rc) |
| 904 | return rc; |
| 905 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 908 | long_op = cifs_write_timeout(cifsi, *poffset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | for (total_written = 0; write_size > total_written; |
| 910 | total_written += bytes_written) { |
| 911 | rc = -EAGAIN; |
| 912 | while (rc == -EAGAIN) { |
| 913 | if (file->private_data == NULL) { |
| 914 | /* file has been closed on us */ |
| 915 | FreeXid(xid); |
| 916 | /* if we have gotten here we have written some data |
| 917 | and blocked, and the file has been freed on us while |
| 918 | we blocked so return what we managed to write */ |
| 919 | return total_written; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | /* we could deadlock if we called |
| 923 | filemap_fdatawait from here so tell |
| 924 | reopen_file not to flush data to server |
| 925 | now */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 926 | rc = cifs_reopen_file(open_file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | if (rc != 0) |
| 928 | break; |
| 929 | } |
| 930 | |
| 931 | rc = CIFSSMBWrite(xid, pTcon, |
| 932 | open_file->netfid, |
| 933 | min_t(const int, cifs_sb->wsize, |
| 934 | write_size - total_written), |
| 935 | *poffset, &bytes_written, |
| 936 | NULL, write_data + total_written, long_op); |
| 937 | } |
| 938 | if (rc || (bytes_written == 0)) { |
| 939 | if (total_written) |
| 940 | break; |
| 941 | else { |
| 942 | FreeXid(xid); |
| 943 | return rc; |
| 944 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 945 | } else { |
| 946 | cifs_update_eof(cifsi, *poffset, bytes_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | *poffset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 948 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 949 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | 15 seconds is plenty */ |
| 951 | } |
| 952 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 953 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 955 | /* Do not update local mtime - server will set its actual value on write |
Jiri Slaby | 50ae28f | 2010-11-01 16:08:55 +0100 | [diff] [blame] | 956 | * inode->i_ctime = inode->i_mtime = |
| 957 | * current_fs_time(inode->i_sb);*/ |
| 958 | if (total_written > 0) { |
| 959 | spin_lock(&inode->i_lock); |
| 960 | if (*poffset > inode->i_size) |
| 961 | i_size_write(inode, *poffset); |
| 962 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } |
Jiri Slaby | 50ae28f | 2010-11-01 16:08:55 +0100 | [diff] [blame] | 964 | mark_inode_dirty_sync(inode); |
| 965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | FreeXid(xid); |
| 967 | return total_written; |
| 968 | } |
| 969 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 970 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
| 971 | const char *write_data, size_t write_size, |
| 972 | loff_t *poffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | { |
| 974 | int rc = 0; |
| 975 | unsigned int bytes_written = 0; |
| 976 | unsigned int total_written; |
| 977 | struct cifs_sb_info *cifs_sb; |
| 978 | struct cifsTconInfo *pTcon; |
| 979 | int xid, long_op; |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 980 | struct dentry *dentry = open_file->dentry; |
| 981 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 983 | cifs_sb = CIFS_SB(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 985 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 986 | *poffset, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 988 | pTcon = tlink_tcon(open_file->tlink); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 992 | long_op = cifs_write_timeout(cifsi, *poffset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | for (total_written = 0; write_size > total_written; |
| 994 | total_written += bytes_written) { |
| 995 | rc = -EAGAIN; |
| 996 | while (rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | /* we could deadlock if we called |
| 999 | filemap_fdatawait from here so tell |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1000 | reopen_file not to flush data to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | server now */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1002 | rc = cifs_reopen_file(open_file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | if (rc != 0) |
| 1004 | break; |
| 1005 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1006 | if (experimEnabled || (pTcon->ses->server && |
| 1007 | ((pTcon->ses->server->secMode & |
Steve French | 0877583 | 2006-05-30 18:08:26 +0000 | [diff] [blame] | 1008 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
Steve French | c01f36a | 2006-05-30 18:05:10 +0000 | [diff] [blame] | 1009 | == 0))) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1010 | struct kvec iov[2]; |
| 1011 | unsigned int len; |
| 1012 | |
Steve French | 0ae0efa | 2005-10-10 10:57:19 -0700 | [diff] [blame] | 1013 | len = min((size_t)cifs_sb->wsize, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1014 | write_size - total_written); |
| 1015 | /* iov[0] is reserved for smb header */ |
| 1016 | iov[1].iov_base = (char *)write_data + |
| 1017 | total_written; |
| 1018 | iov[1].iov_len = len; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1019 | rc = CIFSSMBWrite2(xid, pTcon, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1020 | open_file->netfid, len, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1021 | *poffset, &bytes_written, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1022 | iov, 1, long_op); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1023 | } else |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1024 | rc = CIFSSMBWrite(xid, pTcon, |
| 1025 | open_file->netfid, |
| 1026 | min_t(const int, cifs_sb->wsize, |
| 1027 | write_size - total_written), |
| 1028 | *poffset, &bytes_written, |
| 1029 | write_data + total_written, |
| 1030 | NULL, long_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | } |
| 1032 | if (rc || (bytes_written == 0)) { |
| 1033 | if (total_written) |
| 1034 | break; |
| 1035 | else { |
| 1036 | FreeXid(xid); |
| 1037 | return rc; |
| 1038 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1039 | } else { |
| 1040 | cifs_update_eof(cifsi, *poffset, bytes_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | *poffset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1042 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 1043 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | 15 seconds is plenty */ |
| 1045 | } |
| 1046 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1047 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1049 | if (total_written > 0) { |
| 1050 | spin_lock(&dentry->d_inode->i_lock); |
| 1051 | if (*poffset > dentry->d_inode->i_size) |
| 1052 | i_size_write(dentry->d_inode, *poffset); |
| 1053 | spin_unlock(&dentry->d_inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | } |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1055 | mark_inode_dirty_sync(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | FreeXid(xid); |
| 1057 | return total_written; |
| 1058 | } |
| 1059 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1060 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
| 1061 | bool fsuid_only) |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1062 | { |
| 1063 | struct cifsFileInfo *open_file = NULL; |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1064 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
| 1065 | |
| 1066 | /* only filter by fsuid on multiuser mounts */ |
| 1067 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1068 | fsuid_only = false; |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1069 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1070 | spin_lock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1071 | /* we could simply get the first_list_entry since write-only entries |
| 1072 | are always at the end of the list but since the first entry might |
| 1073 | have a close pending, we go through the whole list */ |
| 1074 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1075 | if (fsuid_only && open_file->uid != current_fsuid()) |
| 1076 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1077 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1078 | if (!open_file->invalidHandle) { |
| 1079 | /* found a good file */ |
| 1080 | /* lock it so it will not be closed on us */ |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1081 | cifsFileInfo_get(open_file); |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1082 | spin_unlock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1083 | return open_file; |
| 1084 | } /* else might as well continue, and look for |
| 1085 | another, or simply have the caller reopen it |
| 1086 | again rather than trying to fix this handle */ |
| 1087 | } else /* write only file */ |
| 1088 | break; /* write only files are last so must be done */ |
| 1089 | } |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1090 | spin_unlock(&cifs_file_list_lock); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1091 | return NULL; |
| 1092 | } |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1093 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1094 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
| 1095 | bool fsuid_only) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1096 | { |
| 1097 | struct cifsFileInfo *open_file; |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1098 | struct cifs_sb_info *cifs_sb; |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1099 | bool any_available = false; |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1100 | int rc; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1101 | |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1102 | /* Having a null inode here (because mapping->host was set to zero by |
| 1103 | the VFS or MM) should not happen but we had reports of on oops (due to |
| 1104 | it being zero) during stress testcases so we need to check for it */ |
| 1105 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1106 | if (cifs_inode == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1107 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1108 | dump_stack(); |
| 1109 | return NULL; |
| 1110 | } |
| 1111 | |
Jeff Layton | d389229 | 2010-11-02 16:22:50 -0400 | [diff] [blame] | 1112 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
| 1113 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1114 | /* only filter by fsuid on multiuser mounts */ |
| 1115 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 1116 | fsuid_only = false; |
| 1117 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1118 | spin_lock(&cifs_file_list_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1119 | refind_writable: |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1120 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1121 | if (!any_available && open_file->pid != current->tgid) |
| 1122 | continue; |
| 1123 | if (fsuid_only && open_file->uid != current_fsuid()) |
| 1124 | continue; |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 1125 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1126 | cifsFileInfo_get(open_file); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1127 | |
| 1128 | if (!open_file->invalidHandle) { |
| 1129 | /* found a good writable file */ |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1130 | spin_unlock(&cifs_file_list_lock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1131 | return open_file; |
| 1132 | } |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1133 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1134 | spin_unlock(&cifs_file_list_lock); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1135 | |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1136 | /* Had to unlock since following call can block */ |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1137 | rc = cifs_reopen_file(open_file, false); |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1138 | if (!rc) |
| 1139 | return open_file; |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1140 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1141 | /* if it fails, try another handle if possible */ |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1142 | cFYI(1, "wp failed on reopen file"); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1143 | cifsFileInfo_put(open_file); |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1144 | |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1145 | spin_lock(&cifs_file_list_lock); |
| 1146 | |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1147 | /* else we simply continue to the next entry. Thus |
| 1148 | we do not loop on reopen errors. If we |
| 1149 | can not reopen the file, for example if we |
| 1150 | reconnected to a server with another client |
| 1151 | racing to delete or lock the file we would not |
| 1152 | make progress if we restarted before the beginning |
| 1153 | of the loop here. */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1154 | } |
| 1155 | } |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1156 | /* couldn't find useable FH with same pid, try any available */ |
| 1157 | if (!any_available) { |
| 1158 | any_available = true; |
| 1159 | goto refind_writable; |
| 1160 | } |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 1161 | spin_unlock(&cifs_file_list_lock); |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1162 | return NULL; |
| 1163 | } |
| 1164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
| 1166 | { |
| 1167 | struct address_space *mapping = page->mapping; |
| 1168 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1169 | char *write_data; |
| 1170 | int rc = -EFAULT; |
| 1171 | int bytes_written = 0; |
| 1172 | struct cifs_sb_info *cifs_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | struct inode *inode; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1174 | struct cifsFileInfo *open_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
| 1176 | if (!mapping || !mapping->host) |
| 1177 | return -EFAULT; |
| 1178 | |
| 1179 | inode = page->mapping->host; |
| 1180 | cifs_sb = CIFS_SB(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
| 1182 | offset += (loff_t)from; |
| 1183 | write_data = kmap(page); |
| 1184 | write_data += from; |
| 1185 | |
| 1186 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { |
| 1187 | kunmap(page); |
| 1188 | return -EIO; |
| 1189 | } |
| 1190 | |
| 1191 | /* racing with truncate? */ |
| 1192 | if (offset > mapping->host->i_size) { |
| 1193 | kunmap(page); |
| 1194 | return 0; /* don't care */ |
| 1195 | } |
| 1196 | |
| 1197 | /* check to make sure that we are not extending the file */ |
| 1198 | if (mapping->host->i_size - offset < (loff_t)to) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1199 | to = (unsigned)(mapping->host->i_size - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1201 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1202 | if (open_file) { |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1203 | bytes_written = cifs_write(open_file, write_data, |
| 1204 | to - from, &offset); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1205 | cifsFileInfo_put(open_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | /* Does mm or vfs already set times? */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1207 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1208 | if ((bytes_written > 0) && (offset)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1209 | rc = 0; |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1210 | else if (bytes_written < 0) |
| 1211 | rc = bytes_written; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1212 | } else { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1213 | cFYI(1, "No writeable filehandles for inode"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | rc = -EIO; |
| 1215 | } |
| 1216 | |
| 1217 | kunmap(page); |
| 1218 | return rc; |
| 1219 | } |
| 1220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | static int cifs_writepages(struct address_space *mapping, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1222 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1224 | unsigned int bytes_to_write; |
| 1225 | unsigned int bytes_written; |
| 1226 | struct cifs_sb_info *cifs_sb; |
| 1227 | int done = 0; |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1228 | pgoff_t end; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1229 | pgoff_t index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1230 | int range_whole = 0; |
| 1231 | struct kvec *iov; |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1232 | int len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1233 | int n_iov = 0; |
| 1234 | pgoff_t next; |
| 1235 | int nr_pages; |
| 1236 | __u64 offset = 0; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1237 | struct cifsFileInfo *open_file; |
Jeff Layton | ba00ba6 | 2010-09-20 16:01:31 -0700 | [diff] [blame] | 1238 | struct cifsTconInfo *tcon; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1239 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1240 | struct page *page; |
| 1241 | struct pagevec pvec; |
| 1242 | int rc = 0; |
| 1243 | int scanned = 0; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1244 | int xid, long_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1246 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1247 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1248 | /* |
| 1249 | * If wsize is smaller that the page cache size, default to writing |
| 1250 | * one page at a time via cifs_writepage |
| 1251 | */ |
| 1252 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) |
| 1253 | return generic_writepages(mapping, wbc); |
| 1254 | |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1255 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1256 | if (iov == NULL) |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1257 | return generic_writepages(mapping, wbc); |
| 1258 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1259 | /* |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1260 | * if there's no open file, then this is likely to fail too, |
| 1261 | * but it'll at least handle the return. Maybe it should be |
| 1262 | * a BUG() instead? |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1263 | */ |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1264 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1265 | if (!open_file) { |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1266 | kfree(iov); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1267 | return generic_writepages(mapping, wbc); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1270 | tcon = tlink_tcon(open_file->tlink); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1271 | if (!experimEnabled && tcon->ses->server->secMode & |
| 1272 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
| 1273 | cifsFileInfo_put(open_file); |
Dan Carpenter | 6b03590 | 2010-10-27 23:19:32 +0200 | [diff] [blame] | 1274 | kfree(iov); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1275 | return generic_writepages(mapping, wbc); |
| 1276 | } |
| 1277 | cifsFileInfo_put(open_file); |
| 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | xid = GetXid(); |
| 1280 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1281 | pagevec_init(&pvec, 0); |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1282 | if (wbc->range_cyclic) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1283 | index = mapping->writeback_index; /* Start from prev offset */ |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1284 | end = -1; |
| 1285 | } else { |
| 1286 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 1287 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 1288 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 1289 | range_whole = 1; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1290 | scanned = 1; |
| 1291 | } |
| 1292 | retry: |
| 1293 | while (!done && (index <= end) && |
| 1294 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 1295 | PAGECACHE_TAG_DIRTY, |
| 1296 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { |
| 1297 | int first; |
| 1298 | unsigned int i; |
| 1299 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1300 | first = -1; |
| 1301 | next = 0; |
| 1302 | n_iov = 0; |
| 1303 | bytes_to_write = 0; |
| 1304 | |
| 1305 | for (i = 0; i < nr_pages; i++) { |
| 1306 | page = pvec.pages[i]; |
| 1307 | /* |
| 1308 | * At this point we hold neither mapping->tree_lock nor |
| 1309 | * lock on the page itself: the page may be truncated or |
| 1310 | * invalidated (changing page->mapping to NULL), or even |
| 1311 | * swizzled back from swapper_space to tmpfs file |
| 1312 | * mapping |
| 1313 | */ |
| 1314 | |
| 1315 | if (first < 0) |
| 1316 | lock_page(page); |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 1317 | else if (!trylock_page(page)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1318 | break; |
| 1319 | |
| 1320 | if (unlikely(page->mapping != mapping)) { |
| 1321 | unlock_page(page); |
| 1322 | break; |
| 1323 | } |
| 1324 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1325 | if (!wbc->range_cyclic && page->index > end) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1326 | done = 1; |
| 1327 | unlock_page(page); |
| 1328 | break; |
| 1329 | } |
| 1330 | |
| 1331 | if (next && (page->index != next)) { |
| 1332 | /* Not next consecutive page */ |
| 1333 | unlock_page(page); |
| 1334 | break; |
| 1335 | } |
| 1336 | |
| 1337 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 1338 | wait_on_page_writeback(page); |
| 1339 | |
| 1340 | if (PageWriteback(page) || |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1341 | !clear_page_dirty_for_io(page)) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1342 | unlock_page(page); |
| 1343 | break; |
| 1344 | } |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1345 | |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1346 | /* |
| 1347 | * This actually clears the dirty bit in the radix tree. |
| 1348 | * See cifs_writepage() for more commentary. |
| 1349 | */ |
| 1350 | set_page_writeback(page); |
| 1351 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1352 | if (page_offset(page) >= mapping->host->i_size) { |
| 1353 | done = 1; |
| 1354 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1355 | end_page_writeback(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1356 | break; |
| 1357 | } |
| 1358 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1359 | /* |
| 1360 | * BB can we get rid of this? pages are held by pvec |
| 1361 | */ |
| 1362 | page_cache_get(page); |
| 1363 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1364 | len = min(mapping->host->i_size - page_offset(page), |
| 1365 | (loff_t)PAGE_CACHE_SIZE); |
| 1366 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1367 | /* reserve iov[0] for the smb header */ |
| 1368 | n_iov++; |
| 1369 | iov[n_iov].iov_base = kmap(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1370 | iov[n_iov].iov_len = len; |
| 1371 | bytes_to_write += len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1372 | |
| 1373 | if (first < 0) { |
| 1374 | first = i; |
| 1375 | offset = page_offset(page); |
| 1376 | } |
| 1377 | next = page->index + 1; |
| 1378 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) |
| 1379 | break; |
| 1380 | } |
| 1381 | if (n_iov) { |
Jeff Layton | 6508d90 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1382 | open_file = find_writable_file(CIFS_I(mapping->host), |
| 1383 | false); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1384 | if (!open_file) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1385 | cERROR(1, "No writable handles for inode"); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1386 | rc = -EBADF; |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 1387 | } else { |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1388 | long_op = cifs_write_timeout(cifsi, offset); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1389 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1390 | bytes_to_write, offset, |
| 1391 | &bytes_written, iov, n_iov, |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1392 | long_op); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1393 | cifsFileInfo_put(open_file); |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1394 | cifs_update_eof(cifsi, offset, bytes_written); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1395 | } |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1396 | |
| 1397 | if (rc || bytes_written < bytes_to_write) { |
| 1398 | cERROR(1, "Write2 ret %d, wrote %d", |
| 1399 | rc, bytes_written); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 1400 | mapping_set_error(mapping, rc); |
Jeff Layton | f3983c2 | 2010-09-22 16:17:40 -0700 | [diff] [blame] | 1401 | } else { |
| 1402 | cifs_stats_bytes_written(tcon, bytes_written); |
| 1403 | } |
| 1404 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1405 | for (i = 0; i < n_iov; i++) { |
| 1406 | page = pvec.pages[first + i]; |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1407 | /* Should we also set page error on |
| 1408 | success rc but too little data written? */ |
| 1409 | /* BB investigate retry logic on temporary |
| 1410 | server crash cases and how recovery works |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1411 | when page marked as error */ |
| 1412 | if (rc) |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1413 | SetPageError(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1414 | kunmap(page); |
| 1415 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1416 | end_page_writeback(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1417 | page_cache_release(page); |
| 1418 | } |
| 1419 | if ((wbc->nr_to_write -= n_iov) <= 0) |
| 1420 | done = 1; |
| 1421 | index = next; |
Dave Kleikamp | b066a48 | 2008-11-18 03:49:05 +0000 | [diff] [blame] | 1422 | } else |
| 1423 | /* Need to re-find the pages we skipped */ |
| 1424 | index = pvec.pages[0]->index + 1; |
| 1425 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1426 | pagevec_release(&pvec); |
| 1427 | } |
| 1428 | if (!scanned && !done) { |
| 1429 | /* |
| 1430 | * We hit the last page and there is more work to be done: wrap |
| 1431 | * back to the start of the file |
| 1432 | */ |
| 1433 | scanned = 1; |
| 1434 | index = 0; |
| 1435 | goto retry; |
| 1436 | } |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1437 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1438 | mapping->writeback_index = index; |
| 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | FreeXid(xid); |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1441 | kfree(iov); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | return rc; |
| 1443 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1445 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | { |
| 1447 | int rc = -EFAULT; |
| 1448 | int xid; |
| 1449 | |
| 1450 | xid = GetXid(); |
| 1451 | /* BB add check for wbc flags */ |
| 1452 | page_cache_get(page); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1453 | if (!PageUptodate(page)) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1454 | cFYI(1, "ppw - page not up to date"); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1455 | |
| 1456 | /* |
| 1457 | * Set the "writeback" flag, and clear "dirty" in the radix tree. |
| 1458 | * |
| 1459 | * A writepage() implementation always needs to do either this, |
| 1460 | * or re-dirty the page with "redirty_page_for_writepage()" in |
| 1461 | * the case of a failure. |
| 1462 | * |
| 1463 | * Just unlocking the page will cause the radix tree tag-bits |
| 1464 | * to fail to update with the state of the page correctly. |
| 1465 | */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1466 | set_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
| 1468 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ |
| 1469 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1470 | end_page_writeback(page); |
| 1471 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | FreeXid(xid); |
| 1473 | return rc; |
| 1474 | } |
| 1475 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1476 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
| 1477 | loff_t pos, unsigned len, unsigned copied, |
| 1478 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1480 | int rc; |
| 1481 | struct inode *inode = mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1483 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
| 1484 | page, pos, copied); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1485 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 1486 | if (PageChecked(page)) { |
| 1487 | if (copied == len) |
| 1488 | SetPageUptodate(page); |
| 1489 | ClearPageChecked(page); |
| 1490 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1491 | SetPageUptodate(page); |
| 1492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | if (!PageUptodate(page)) { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1494 | char *page_data; |
| 1495 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1496 | int xid; |
| 1497 | |
| 1498 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | /* this is probably better than directly calling |
| 1500 | partialpage_write since in this function the file handle is |
| 1501 | known which we might as well leverage */ |
| 1502 | /* BB check if anything else missing out of ppw |
| 1503 | such as updating last write time */ |
| 1504 | page_data = kmap(page); |
Jeff Layton | 7da4b49 | 2010-10-15 15:34:00 -0400 | [diff] [blame] | 1505 | rc = cifs_write(file->private_data, page_data + offset, |
| 1506 | copied, &pos); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1507 | /* if (rc < 0) should we set writebehind rc? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | kunmap(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1509 | |
| 1510 | FreeXid(xid); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1511 | } else { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1512 | rc = copied; |
| 1513 | pos += copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | set_page_dirty(page); |
| 1515 | } |
| 1516 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1517 | if (rc > 0) { |
| 1518 | spin_lock(&inode->i_lock); |
| 1519 | if (pos > inode->i_size) |
| 1520 | i_size_write(inode, pos); |
| 1521 | spin_unlock(&inode->i_lock); |
| 1522 | } |
| 1523 | |
| 1524 | unlock_page(page); |
| 1525 | page_cache_release(page); |
| 1526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | return rc; |
| 1528 | } |
| 1529 | |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1530 | int cifs_fsync(struct file *file, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | { |
| 1532 | int xid; |
| 1533 | int rc = 0; |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1534 | struct cifsTconInfo *tcon; |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 1535 | struct cifsFileInfo *smbfile = file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1536 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
| 1538 | xid = GetXid(); |
| 1539 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1540 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1541 | file->f_path.dentry->d_name.name, datasync); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1542 | |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1543 | rc = filemap_write_and_wait(inode->i_mapping); |
| 1544 | if (rc == 0) { |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 1545 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 1546 | |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1547 | tcon = tlink_tcon(smbfile->tlink); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 1548 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1549 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1550 | } |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | FreeXid(xid); |
| 1553 | return rc; |
| 1554 | } |
| 1555 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1556 | /* static void cifs_sync_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | { |
| 1558 | struct address_space *mapping; |
| 1559 | struct inode *inode; |
| 1560 | unsigned long index = page->index; |
| 1561 | unsigned int rpages = 0; |
| 1562 | int rc = 0; |
| 1563 | |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 1564 | cFYI(1, "sync page %p", page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | mapping = page->mapping; |
| 1566 | if (!mapping) |
| 1567 | return 0; |
| 1568 | inode = mapping->host; |
| 1569 | if (!inode) |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1570 | return; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1572 | /* fill in rpages then |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
| 1574 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1575 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1577 | #if 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | if (rc < 0) |
| 1579 | return rc; |
| 1580 | return 0; |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1581 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | } */ |
| 1583 | |
| 1584 | /* |
| 1585 | * As file closes, flush all cached write data for this inode checking |
| 1586 | * for write behind errors. |
| 1587 | */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1588 | int cifs_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1590 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | int rc = 0; |
| 1592 | |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 1593 | if (file->f_mode & FMODE_WRITE) |
Jeff Layton | d3f1322 | 2010-10-15 15:34:07 -0400 | [diff] [blame] | 1594 | rc = filemap_write_and_wait(inode->i_mapping); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1595 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1596 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | |
| 1598 | return rc; |
| 1599 | } |
| 1600 | |
| 1601 | ssize_t cifs_user_read(struct file *file, char __user *read_data, |
| 1602 | size_t read_size, loff_t *poffset) |
| 1603 | { |
| 1604 | int rc = -EACCES; |
| 1605 | unsigned int bytes_read = 0; |
| 1606 | unsigned int total_read = 0; |
| 1607 | unsigned int current_read_size; |
| 1608 | struct cifs_sb_info *cifs_sb; |
| 1609 | struct cifsTconInfo *pTcon; |
| 1610 | int xid; |
| 1611 | struct cifsFileInfo *open_file; |
| 1612 | char *smb_read_data; |
| 1613 | char __user *current_offset; |
| 1614 | struct smb_com_read_rsp *pSMBr; |
| 1615 | |
| 1616 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1617 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | |
| 1619 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1620 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1622 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | } |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 1624 | open_file = file->private_data; |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1625 | pTcon = tlink_tcon(open_file->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1627 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1628 | cFYI(1, "attempting read on write only file instance"); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | for (total_read = 0, current_offset = read_data; |
| 1631 | read_size > total_read; |
| 1632 | total_read += bytes_read, current_offset += bytes_read) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1633 | current_read_size = min_t(const int, read_size - total_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | cifs_sb->rsize); |
| 1635 | rc = -EAGAIN; |
| 1636 | smb_read_data = NULL; |
| 1637 | while (rc == -EAGAIN) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1638 | int buf_type = CIFS_NO_BUFFER; |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1639 | if (open_file->invalidHandle) { |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1640 | rc = cifs_reopen_file(open_file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | if (rc != 0) |
| 1642 | break; |
| 1643 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1644 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1645 | open_file->netfid, |
| 1646 | current_read_size, *poffset, |
| 1647 | &bytes_read, &smb_read_data, |
| 1648 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | if (smb_read_data) { |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1651 | if (copy_to_user(current_offset, |
| 1652 | smb_read_data + |
| 1653 | 4 /* RFC1001 length field */ + |
| 1654 | le16_to_cpu(pSMBr->DataOffset), |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1655 | bytes_read)) |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1656 | rc = -EFAULT; |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1657 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1658 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1659 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1660 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1661 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | smb_read_data = NULL; |
| 1663 | } |
| 1664 | } |
| 1665 | if (rc || (bytes_read == 0)) { |
| 1666 | if (total_read) { |
| 1667 | break; |
| 1668 | } else { |
| 1669 | FreeXid(xid); |
| 1670 | return rc; |
| 1671 | } |
| 1672 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1673 | cifs_stats_bytes_read(pTcon, bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | *poffset += bytes_read; |
| 1675 | } |
| 1676 | } |
| 1677 | FreeXid(xid); |
| 1678 | return total_read; |
| 1679 | } |
| 1680 | |
| 1681 | |
| 1682 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, |
| 1683 | loff_t *poffset) |
| 1684 | { |
| 1685 | int rc = -EACCES; |
| 1686 | unsigned int bytes_read = 0; |
| 1687 | unsigned int total_read; |
| 1688 | unsigned int current_read_size; |
| 1689 | struct cifs_sb_info *cifs_sb; |
| 1690 | struct cifsTconInfo *pTcon; |
| 1691 | int xid; |
| 1692 | char *current_offset; |
| 1693 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1694 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | |
| 1696 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1697 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
| 1699 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1700 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1702 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | } |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 1704 | open_file = file->private_data; |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1705 | pTcon = tlink_tcon(open_file->tlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | |
| 1707 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1708 | cFYI(1, "attempting read on write only file instance"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1710 | for (total_read = 0, current_offset = read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | read_size > total_read; |
| 1712 | total_read += bytes_read, current_offset += bytes_read) { |
| 1713 | current_read_size = min_t(const int, read_size - total_read, |
| 1714 | cifs_sb->rsize); |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1715 | /* For windows me and 9x we do not want to request more |
| 1716 | than it negotiated since it will refuse the read then */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1717 | if ((pTcon->ses) && |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1718 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
| 1719 | current_read_size = min_t(const int, current_read_size, |
| 1720 | pTcon->ses->server->maxBuf - 128); |
| 1721 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | rc = -EAGAIN; |
| 1723 | while (rc == -EAGAIN) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1724 | if (open_file->invalidHandle) { |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1725 | rc = cifs_reopen_file(open_file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | if (rc != 0) |
| 1727 | break; |
| 1728 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1729 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1730 | open_file->netfid, |
| 1731 | current_read_size, *poffset, |
| 1732 | &bytes_read, ¤t_offset, |
| 1733 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | } |
| 1735 | if (rc || (bytes_read == 0)) { |
| 1736 | if (total_read) { |
| 1737 | break; |
| 1738 | } else { |
| 1739 | FreeXid(xid); |
| 1740 | return rc; |
| 1741 | } |
| 1742 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1743 | cifs_stats_bytes_read(pTcon, total_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | *poffset += bytes_read; |
| 1745 | } |
| 1746 | } |
| 1747 | FreeXid(xid); |
| 1748 | return total_read; |
| 1749 | } |
| 1750 | |
| 1751 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 1752 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | int rc, xid; |
| 1754 | |
| 1755 | xid = GetXid(); |
Jeff Layton | abab095 | 2010-02-12 07:44:18 -0500 | [diff] [blame] | 1756 | rc = cifs_revalidate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | if (rc) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1758 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | FreeXid(xid); |
| 1760 | return rc; |
| 1761 | } |
| 1762 | rc = generic_file_mmap(file, vma); |
| 1763 | FreeXid(xid); |
| 1764 | return rc; |
| 1765 | } |
| 1766 | |
| 1767 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1768 | static void cifs_copy_cache_pages(struct address_space *mapping, |
Nick Piggin | 315e995 | 2010-04-21 03:18:28 +0000 | [diff] [blame] | 1769 | struct list_head *pages, int bytes_read, char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | { |
| 1771 | struct page *page; |
| 1772 | char *target; |
| 1773 | |
| 1774 | while (bytes_read > 0) { |
| 1775 | if (list_empty(pages)) |
| 1776 | break; |
| 1777 | |
| 1778 | page = list_entry(pages->prev, struct page, lru); |
| 1779 | list_del(&page->lru); |
| 1780 | |
Nick Piggin | 315e995 | 2010-04-21 03:18:28 +0000 | [diff] [blame] | 1781 | if (add_to_page_cache_lru(page, mapping, page->index, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | GFP_KERNEL)) { |
| 1783 | page_cache_release(page); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1784 | cFYI(1, "Add page cache failed"); |
Steve French | 3079ca6 | 2005-06-09 14:44:07 -0700 | [diff] [blame] | 1785 | data += PAGE_CACHE_SIZE; |
| 1786 | bytes_read -= PAGE_CACHE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | continue; |
| 1788 | } |
Jeff Layton | 06b4367 | 2010-06-01 10:54:45 -0400 | [diff] [blame] | 1789 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1791 | target = kmap_atomic(page, KM_USER0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
| 1793 | if (PAGE_CACHE_SIZE > bytes_read) { |
| 1794 | memcpy(target, data, bytes_read); |
| 1795 | /* zero the tail end of this partial page */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1796 | memset(target + bytes_read, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | PAGE_CACHE_SIZE - bytes_read); |
| 1798 | bytes_read = 0; |
| 1799 | } else { |
| 1800 | memcpy(target, data, PAGE_CACHE_SIZE); |
| 1801 | bytes_read -= PAGE_CACHE_SIZE; |
| 1802 | } |
| 1803 | kunmap_atomic(target, KM_USER0); |
| 1804 | |
| 1805 | flush_dcache_page(page); |
| 1806 | SetPageUptodate(page); |
| 1807 | unlock_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | data += PAGE_CACHE_SIZE; |
Suresh Jayaraman | 9dc0655 | 2010-07-05 18:13:11 +0530 | [diff] [blame] | 1809 | |
| 1810 | /* add page to FS-Cache */ |
| 1811 | cifs_readpage_to_fscache(mapping->host, page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | } |
| 1813 | return; |
| 1814 | } |
| 1815 | |
| 1816 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
| 1817 | struct list_head *page_list, unsigned num_pages) |
| 1818 | { |
| 1819 | int rc = -EACCES; |
| 1820 | int xid; |
| 1821 | loff_t offset; |
| 1822 | struct page *page; |
| 1823 | struct cifs_sb_info *cifs_sb; |
| 1824 | struct cifsTconInfo *pTcon; |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 1825 | unsigned int bytes_read = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1826 | unsigned int read_size, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | char *smb_read_data = NULL; |
| 1828 | struct smb_com_read_rsp *pSMBr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1830 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | |
| 1832 | xid = GetXid(); |
| 1833 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1834 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1836 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | } |
Joe Perches | c21dfb6 | 2010-07-12 13:50:14 -0700 | [diff] [blame] | 1838 | open_file = file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1839 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 1840 | pTcon = tlink_tcon(open_file->tlink); |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1841 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 1842 | /* |
| 1843 | * Reads as many pages as possible from fscache. Returns -ENOBUFS |
| 1844 | * immediately if the cookie is negative |
| 1845 | */ |
| 1846 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, |
| 1847 | &num_pages); |
| 1848 | if (rc == 0) |
| 1849 | goto read_complete; |
| 1850 | |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 1851 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | for (i = 0; i < num_pages; ) { |
| 1853 | unsigned contig_pages; |
| 1854 | struct page *tmp_page; |
| 1855 | unsigned long expected_index; |
| 1856 | |
| 1857 | if (list_empty(page_list)) |
| 1858 | break; |
| 1859 | |
| 1860 | page = list_entry(page_list->prev, struct page, lru); |
| 1861 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1862 | |
| 1863 | /* count adjacent pages that we will read into */ |
| 1864 | contig_pages = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1865 | expected_index = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | list_entry(page_list->prev, struct page, lru)->index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1867 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | if (tmp_page->index == expected_index) { |
| 1869 | contig_pages++; |
| 1870 | expected_index++; |
| 1871 | } else |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1872 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | } |
| 1874 | if (contig_pages + i > num_pages) |
| 1875 | contig_pages = num_pages - i; |
| 1876 | |
| 1877 | /* for reads over a certain size could initiate async |
| 1878 | read ahead */ |
| 1879 | |
| 1880 | read_size = contig_pages * PAGE_CACHE_SIZE; |
| 1881 | /* Read size needs to be in multiples of one page */ |
| 1882 | read_size = min_t(const unsigned int, read_size, |
| 1883 | cifs_sb->rsize & PAGE_CACHE_MASK); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1884 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
| 1885 | read_size, contig_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | rc = -EAGAIN; |
| 1887 | while (rc == -EAGAIN) { |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 1888 | if (open_file->invalidHandle) { |
Jeff Layton | 1588617 | 2010-10-15 15:33:59 -0400 | [diff] [blame] | 1889 | rc = cifs_reopen_file(open_file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | if (rc != 0) |
| 1891 | break; |
| 1892 | } |
| 1893 | |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1894 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1895 | open_file->netfid, |
| 1896 | read_size, offset, |
| 1897 | &bytes_read, &smb_read_data, |
| 1898 | &buf_type); |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 1899 | /* BB more RC checks ? */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1900 | if (rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1902 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1903 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1904 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1905 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | smb_read_data = NULL; |
| 1907 | } |
| 1908 | } |
| 1909 | } |
| 1910 | if ((rc < 0) || (smb_read_data == NULL)) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1911 | cFYI(1, "Read error in readpages: %d", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | break; |
| 1913 | } else if (bytes_read > 0) { |
Andrew Morton | 6f88cc2 | 2006-12-10 02:19:44 -0800 | [diff] [blame] | 1914 | task_io_account_read(bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
| 1916 | cifs_copy_cache_pages(mapping, page_list, bytes_read, |
| 1917 | smb_read_data + 4 /* RFC1001 hdr */ + |
Nick Piggin | 315e995 | 2010-04-21 03:18:28 +0000 | [diff] [blame] | 1918 | le16_to_cpu(pSMBr->DataOffset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
| 1920 | i += bytes_read >> PAGE_CACHE_SHIFT; |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1921 | cifs_stats_bytes_read(pTcon, bytes_read); |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 1922 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | i++; /* account for partial page */ |
| 1924 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1925 | /* server copy of file can have smaller size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | than client */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1927 | /* BB do we need to verify this common case ? |
| 1928 | this case is ok - if we are at server EOF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | we will hit it on next read */ |
| 1930 | |
OGAWA Hirofumi | 05ac9d4 | 2006-11-02 22:07:08 -0800 | [diff] [blame] | 1931 | /* break; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | } |
| 1933 | } else { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1934 | cFYI(1, "No bytes read (%d) at offset %lld . " |
Steve French | f19159d | 2010-04-21 04:12:10 +0000 | [diff] [blame] | 1935 | "Cleaning remaining pages from readahead list", |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1936 | bytes_read, offset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1937 | /* BB turn off caching and do new lookup on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | file size at server? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | break; |
| 1940 | } |
| 1941 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1942 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1943 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1944 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1945 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | smb_read_data = NULL; |
| 1947 | } |
| 1948 | bytes_read = 0; |
| 1949 | } |
| 1950 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | /* need to free smb_read_data buf before exit */ |
| 1952 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1953 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 1954 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1955 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 1956 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | smb_read_data = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1958 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 1960 | read_complete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | FreeXid(xid); |
| 1962 | return rc; |
| 1963 | } |
| 1964 | |
| 1965 | static int cifs_readpage_worker(struct file *file, struct page *page, |
| 1966 | loff_t *poffset) |
| 1967 | { |
| 1968 | char *read_data; |
| 1969 | int rc; |
| 1970 | |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 1971 | /* Is the page cached? */ |
| 1972 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); |
| 1973 | if (rc == 0) |
| 1974 | goto read_complete; |
| 1975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | page_cache_get(page); |
| 1977 | read_data = kmap(page); |
| 1978 | /* for reads over a certain size could initiate async read ahead */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | if (rc < 0) |
| 1983 | goto io_error; |
| 1984 | else |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 1985 | cFYI(1, "Bytes read %d", rc); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1986 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1987 | file->f_path.dentry->d_inode->i_atime = |
| 1988 | current_fs_time(file->f_path.dentry->d_inode->i_sb); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | if (PAGE_CACHE_SIZE > rc) |
| 1991 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); |
| 1992 | |
| 1993 | flush_dcache_page(page); |
| 1994 | SetPageUptodate(page); |
Suresh Jayaraman | 9dc0655 | 2010-07-05 18:13:11 +0530 | [diff] [blame] | 1995 | |
| 1996 | /* send this page to the cache */ |
| 1997 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); |
| 1998 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | rc = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2000 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | io_error: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2002 | kunmap(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | page_cache_release(page); |
Suresh Jayaraman | 5669823 | 2010-07-05 18:13:25 +0530 | [diff] [blame] | 2004 | |
| 2005 | read_complete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | return rc; |
| 2007 | } |
| 2008 | |
| 2009 | static int cifs_readpage(struct file *file, struct page *page) |
| 2010 | { |
| 2011 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 2012 | int rc = -EACCES; |
| 2013 | int xid; |
| 2014 | |
| 2015 | xid = GetXid(); |
| 2016 | |
| 2017 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2018 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2020 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } |
| 2022 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2023 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
| 2024 | page, (int)offset, (int)offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | |
| 2026 | rc = cifs_readpage_worker(file, page, &offset); |
| 2027 | |
| 2028 | unlock_page(page); |
| 2029 | |
| 2030 | FreeXid(xid); |
| 2031 | return rc; |
| 2032 | } |
| 2033 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2034 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| 2035 | { |
| 2036 | struct cifsFileInfo *open_file; |
| 2037 | |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 2038 | spin_lock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2039 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 2e396b8 | 2010-10-15 15:34:01 -0400 | [diff] [blame] | 2040 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 2041 | spin_unlock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2042 | return 1; |
| 2043 | } |
| 2044 | } |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 2045 | spin_unlock(&cifs_file_list_lock); |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2046 | return 0; |
| 2047 | } |
| 2048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | /* We do not want to update the file size from server for inodes |
| 2050 | open for write - to avoid races with writepage extending |
| 2051 | the file - in the future we could consider allowing |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2052 | refreshing the inode only on increases in the file size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | but this is tricky to do without racing with writebehind |
| 2054 | page caching in the current Linux kernel design */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2055 | 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] | 2056 | { |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2057 | if (!cifsInode) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2058 | return true; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2059 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2060 | if (is_inode_writable(cifsInode)) { |
| 2061 | /* This inode is open for write at least once */ |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2062 | struct cifs_sb_info *cifs_sb; |
| 2063 | |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2064 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2065 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2066 | /* since no page cache to corrupt on directio |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2067 | we can change size safely */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2068 | return true; |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2069 | } |
| 2070 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2071 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2072 | return true; |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 2073 | |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2074 | return false; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2075 | } else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2076 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | } |
| 2078 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2079 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
| 2080 | loff_t pos, unsigned len, unsigned flags, |
| 2081 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2083 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 2084 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2085 | loff_t page_start = pos & PAGE_MASK; |
| 2086 | loff_t i_size; |
| 2087 | struct page *page; |
| 2088 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2090 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2091 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2092 | page = grab_cache_page_write_begin(mapping, index, flags); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2093 | if (!page) { |
| 2094 | rc = -ENOMEM; |
| 2095 | goto out; |
| 2096 | } |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2097 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2098 | if (PageUptodate(page)) |
| 2099 | goto out; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2100 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2101 | /* |
| 2102 | * If we write a full page it will be up to date, no need to read from |
| 2103 | * the server. If the write is short, we'll end up doing a sync write |
| 2104 | * instead. |
| 2105 | */ |
| 2106 | if (len == PAGE_CACHE_SIZE) |
| 2107 | goto out; |
| 2108 | |
| 2109 | /* |
| 2110 | * optimize away the read when we have an oplock, and we're not |
| 2111 | * expecting to use any of the data we'd be reading in. That |
| 2112 | * is, when the page lies beyond the EOF, or straddles the EOF |
| 2113 | * and the write will cover all of the existing data. |
| 2114 | */ |
| 2115 | if (CIFS_I(mapping->host)->clientCanCacheRead) { |
| 2116 | i_size = i_size_read(mapping->host); |
| 2117 | if (page_start >= i_size || |
| 2118 | (offset == 0 && (pos + len) >= i_size)) { |
| 2119 | zero_user_segments(page, 0, offset, |
| 2120 | offset + len, |
| 2121 | PAGE_CACHE_SIZE); |
| 2122 | /* |
| 2123 | * PageChecked means that the parts of the page |
| 2124 | * to which we're not writing are considered up |
| 2125 | * to date. Once the data is copied to the |
| 2126 | * page, it can be set uptodate. |
| 2127 | */ |
| 2128 | SetPageChecked(page); |
| 2129 | goto out; |
| 2130 | } |
| 2131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2133 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2134 | /* |
| 2135 | * might as well read a page, it is fast enough. If we get |
| 2136 | * an error, we don't need to return it. cifs_write_end will |
| 2137 | * do a sync write instead since PG_uptodate isn't set. |
| 2138 | */ |
| 2139 | cifs_readpage_worker(file, page, &page_start); |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2140 | } else { |
| 2141 | /* we could try using another file handle if there is one - |
| 2142 | but how would we lock it to prevent close of that handle |
| 2143 | racing with this read? In any case |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2144 | this will be written out by write_end so is fine */ |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2145 | } |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2146 | out: |
| 2147 | *pagep = page; |
| 2148 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | } |
| 2150 | |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 2151 | static int cifs_release_page(struct page *page, gfp_t gfp) |
| 2152 | { |
| 2153 | if (PagePrivate(page)) |
| 2154 | return 0; |
| 2155 | |
| 2156 | return cifs_fscache_release_page(page, gfp); |
| 2157 | } |
| 2158 | |
| 2159 | static void cifs_invalidate_page(struct page *page, unsigned long offset) |
| 2160 | { |
| 2161 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); |
| 2162 | |
| 2163 | if (offset == 0) |
| 2164 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
| 2165 | } |
| 2166 | |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2167 | void cifs_oplock_break(struct work_struct *work) |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2168 | { |
| 2169 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 2170 | oplock_break); |
Jeff Layton | a5e18bc | 2010-10-11 15:07:18 -0400 | [diff] [blame] | 2171 | struct inode *inode = cfile->dentry->d_inode; |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2172 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2173 | int rc = 0; |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2174 | |
| 2175 | if (inode && S_ISREG(inode->i_mode)) { |
Steve French | d54ff73 | 2010-04-27 04:38:15 +0000 | [diff] [blame] | 2176 | if (cinode->clientCanCacheRead) |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 2177 | break_lease(inode, O_RDONLY); |
Steve French | d54ff73 | 2010-04-27 04:38:15 +0000 | [diff] [blame] | 2178 | else |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 2179 | break_lease(inode, O_WRONLY); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2180 | rc = filemap_fdatawrite(inode->i_mapping); |
| 2181 | if (cinode->clientCanCacheRead == 0) { |
Jeff Layton | eb4b756 | 2010-10-22 14:52:29 -0400 | [diff] [blame] | 2182 | rc = filemap_fdatawait(inode->i_mapping); |
| 2183 | mapping_set_error(inode->i_mapping, rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2184 | invalidate_remote_inode(inode); |
| 2185 | } |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2186 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2187 | } |
| 2188 | |
| 2189 | /* |
| 2190 | * releasing stale oplock after recent reconnect of smb session using |
| 2191 | * a now incorrect file handle is not a data integrity issue but do |
| 2192 | * not bother sending an oplock release if session to server still is |
| 2193 | * disconnected since oplock already released by the server |
| 2194 | */ |
Steve French | cdff08e | 2010-10-21 22:46:14 +0000 | [diff] [blame] | 2195 | if (!cfile->oplock_break_cancelled) { |
Jeff Layton | 13cfb73 | 2010-09-29 19:51:11 -0400 | [diff] [blame] | 2196 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
| 2197 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 2198 | cFYI(1, "Oplock release rc = %d", rc); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2199 | } |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2200 | |
| 2201 | /* |
| 2202 | * We might have kicked in before is_valid_oplock_break() |
| 2203 | * finished grabbing reference for us. Make sure it's done by |
Suresh Jayaraman | 6573e9b | 2010-10-18 23:52:18 +0530 | [diff] [blame] | 2204 | * waiting for cifs_file_list_lock. |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2205 | */ |
Jeff Layton | 4477288 | 2010-10-15 15:34:03 -0400 | [diff] [blame] | 2206 | spin_lock(&cifs_file_list_lock); |
| 2207 | spin_unlock(&cifs_file_list_lock); |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2208 | |
| 2209 | cifs_oplock_break_put(cfile); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2210 | } |
| 2211 | |
Jeff Layton | 5f6dbc9 | 2010-10-15 15:34:06 -0400 | [diff] [blame] | 2212 | /* must be called while holding cifs_file_list_lock */ |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2213 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2214 | { |
Jeff Layton | d7c86ff | 2010-10-11 15:07:19 -0400 | [diff] [blame] | 2215 | cifs_sb_active(cfile->dentry->d_sb); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2216 | cifsFileInfo_get(cfile); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2217 | } |
| 2218 | |
Tejun Heo | 9b64697 | 2010-07-20 22:09:02 +0200 | [diff] [blame] | 2219 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2220 | { |
Jeff Layton | ebe2e91 | 2010-11-10 10:19:10 -0500 | [diff] [blame] | 2221 | struct super_block *sb = cfile->dentry->d_sb; |
| 2222 | |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2223 | cifsFileInfo_put(cfile); |
Jeff Layton | ebe2e91 | 2010-11-10 10:19:10 -0500 | [diff] [blame] | 2224 | cifs_sb_deactive(sb); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2225 | } |
| 2226 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2227 | const struct address_space_operations cifs_addr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | .readpage = cifs_readpage, |
| 2229 | .readpages = cifs_readpages, |
| 2230 | .writepage = cifs_writepage, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2231 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2232 | .write_begin = cifs_write_begin, |
| 2233 | .write_end = cifs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 2235 | .releasepage = cifs_release_page, |
| 2236 | .invalidatepage = cifs_invalidate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | /* .sync_page = cifs_sync_page, */ |
| 2238 | /* .direct_IO = */ |
| 2239 | }; |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2240 | |
| 2241 | /* |
| 2242 | * cifs_readpages requires the server to support a buffer large enough to |
| 2243 | * contain the header plus one complete page of data. Otherwise, we need |
| 2244 | * to leave cifs_readpages out of the address space operations. |
| 2245 | */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2246 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2247 | .readpage = cifs_readpage, |
| 2248 | .writepage = cifs_writepage, |
| 2249 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2250 | .write_begin = cifs_write_begin, |
| 2251 | .write_end = cifs_write_end, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2252 | .set_page_dirty = __set_page_dirty_nobuffers, |
Suresh Jayaraman | 85f2d6b | 2010-07-05 18:13:00 +0530 | [diff] [blame] | 2253 | .releasepage = cifs_release_page, |
| 2254 | .invalidatepage = cifs_invalidate_page, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2255 | /* .sync_page = cifs_sync_page, */ |
| 2256 | /* .direct_IO = */ |
| 2257 | }; |