Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
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> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
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" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
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 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
608712fe | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 64 | { |
608712fe | 65 | u32 posix_flags = 0; |
e10f7b55 | 66 | |
7fc8f4e9 | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 68 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
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 */ | |
6b2f3d1f | 81 | if (flags & O_DSYNC) |
608712fe | 82 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 83 | if (flags & O_DIRECTORY) |
608712fe | 84 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 85 | if (flags & O_NOFOLLOW) |
608712fe | 86 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 87 | if (flags & O_DIRECT) |
608712fe | 88 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
89 | |
90 | return posix_flags; | |
1da177e4 LT |
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; | |
55aa2e09 SF |
101 | else if ((flags & O_TRUNC) == O_TRUNC) |
102 | return FILE_OVERWRITE; | |
1da177e4 LT |
103 | else |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
db460242 | 107 | static inline int cifs_open_inode_helper(struct inode *inode, |
a347ecb2 | 108 | struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf, |
1da177e4 LT |
109 | char *full_path, int xid) |
110 | { | |
db460242 | 111 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
1da177e4 LT |
112 | struct timespec temp; |
113 | int rc; | |
114 | ||
1da177e4 LT |
115 | if (pCifsInode->clientCanCacheRead) { |
116 | /* we have the inode open somewhere else | |
117 | no need to discard cache data */ | |
118 | goto client_can_cache; | |
119 | } | |
120 | ||
121 | /* BB need same check in cifs_create too? */ | |
122 | /* if not oplocked, invalidate inode pages if mtime or file | |
123 | size changed */ | |
07119a4d | 124 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
db460242 JL |
125 | if (timespec_equal(&inode->i_mtime, &temp) && |
126 | (inode->i_size == | |
1da177e4 | 127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 128 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 129 | } else { |
db460242 | 130 | if (inode->i_mapping) { |
ff215713 SF |
131 | /* BB no need to lock inode until after invalidate |
132 | since namei code should already have it locked? */ | |
db460242 | 133 | rc = filemap_write_and_wait(inode->i_mapping); |
cea21805 | 134 | if (rc != 0) |
db460242 | 135 | pCifsInode->write_behind_rc = rc; |
1da177e4 | 136 | } |
b6b38f70 JP |
137 | cFYI(1, "invalidating remote inode since open detected it " |
138 | "changed"); | |
db460242 | 139 | invalidate_remote_inode(inode); |
1da177e4 LT |
140 | } |
141 | ||
142 | client_can_cache: | |
c18c842b | 143 | if (pTcon->unix_ext) |
db460242 JL |
144 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
145 | xid); | |
1da177e4 | 146 | else |
db460242 JL |
147 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
148 | xid, NULL); | |
1da177e4 | 149 | |
a347ecb2 | 150 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
4b18f2a9 SF |
151 | pCifsInode->clientCanCacheAll = true; |
152 | pCifsInode->clientCanCacheRead = true; | |
db460242 | 153 | cFYI(1, "Exclusive Oplock granted on inode %p", inode); |
a347ecb2 | 154 | } else if ((oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 155 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
156 | |
157 | return rc; | |
158 | } | |
159 | ||
608712fe JL |
160 | int cifs_posix_open(char *full_path, struct inode **pinode, |
161 | struct super_block *sb, int mode, unsigned int f_flags, | |
162 | __u32 *poplock, __u16 *pnetfid, int xid) | |
163 | { | |
164 | int rc; | |
165 | FILE_UNIX_BASIC_INFO *presp_data; | |
166 | __u32 posix_flags = 0; | |
167 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
168 | struct cifs_fattr fattr; | |
169 | struct tcon_link *tlink; | |
170 | struct cifsTconInfo *tcon; | |
171 | ||
172 | cFYI(1, "posix open %s", full_path); | |
173 | ||
174 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
175 | if (presp_data == NULL) | |
176 | return -ENOMEM; | |
177 | ||
178 | tlink = cifs_sb_tlink(cifs_sb); | |
179 | if (IS_ERR(tlink)) { | |
180 | rc = PTR_ERR(tlink); | |
181 | goto posix_open_ret; | |
182 | } | |
183 | ||
184 | tcon = tlink_tcon(tlink); | |
185 | mode &= ~current_umask(); | |
186 | ||
187 | posix_flags = cifs_posix_convert_flags(f_flags); | |
188 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
189 | poplock, full_path, cifs_sb->local_nls, | |
190 | cifs_sb->mnt_cifs_flags & | |
191 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
192 | cifs_put_tlink(tlink); | |
193 | ||
194 | if (rc) | |
195 | goto posix_open_ret; | |
196 | ||
197 | if (presp_data->Type == cpu_to_le32(-1)) | |
198 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
199 | ||
200 | if (!pinode) | |
201 | goto posix_open_ret; /* caller does not need info */ | |
202 | ||
203 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
204 | ||
205 | /* get new inode and set it up */ | |
206 | if (*pinode == NULL) { | |
207 | cifs_fill_uniqueid(sb, &fattr); | |
208 | *pinode = cifs_iget(sb, &fattr); | |
209 | if (!*pinode) { | |
210 | rc = -ENOMEM; | |
211 | goto posix_open_ret; | |
212 | } | |
213 | } else { | |
214 | cifs_fattr_to_inode(*pinode, &fattr); | |
215 | } | |
216 | ||
217 | posix_open_ret: | |
218 | kfree(presp_data); | |
219 | return rc; | |
220 | } | |
221 | ||
15ecb436 JL |
222 | struct cifsFileInfo * |
223 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
224 | struct tcon_link *tlink, __u32 oplock) | |
225 | { | |
226 | struct dentry *dentry = file->f_path.dentry; | |
227 | struct inode *inode = dentry->d_inode; | |
228 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
229 | struct cifsFileInfo *pCifsFile; | |
230 | ||
231 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
232 | if (pCifsFile == NULL) | |
233 | return pCifsFile; | |
234 | ||
5f6dbc9e | 235 | pCifsFile->count = 1; |
15ecb436 JL |
236 | pCifsFile->netfid = fileHandle; |
237 | pCifsFile->pid = current->tgid; | |
238 | pCifsFile->uid = current_fsuid(); | |
239 | pCifsFile->dentry = dget(dentry); | |
240 | pCifsFile->f_flags = file->f_flags; | |
241 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
242 | pCifsFile->tlink = cifs_get_tlink(tlink); |
243 | mutex_init(&pCifsFile->fh_mutex); | |
244 | mutex_init(&pCifsFile->lock_mutex); | |
245 | INIT_LIST_HEAD(&pCifsFile->llist); | |
15ecb436 JL |
246 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
247 | ||
4477288a | 248 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
249 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
250 | /* if readable file instance put first in list*/ | |
251 | if (file->f_mode & FMODE_READ) | |
252 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
253 | else | |
254 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 255 | spin_unlock(&cifs_file_list_lock); |
15ecb436 JL |
256 | |
257 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
258 | pCifsInode->clientCanCacheAll = true; | |
259 | pCifsInode->clientCanCacheRead = true; | |
260 | cFYI(1, "Exclusive Oplock inode %p", inode); | |
261 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
262 | pCifsInode->clientCanCacheRead = true; | |
263 | ||
264 | file->private_data = pCifsFile; | |
265 | return pCifsFile; | |
266 | } | |
267 | ||
cdff08e7 SF |
268 | /* |
269 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
270 | * the filehandle out on the server. Must be called without holding |
271 | * cifs_file_list_lock. | |
cdff08e7 | 272 | */ |
b33879aa JL |
273 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
274 | { | |
cdff08e7 SF |
275 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); |
276 | struct cifsInodeInfo *cifsi = CIFS_I(cifs_file->dentry->d_inode); | |
277 | struct cifsLockInfo *li, *tmp; | |
278 | ||
279 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 280 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
281 | spin_unlock(&cifs_file_list_lock); |
282 | return; | |
283 | } | |
284 | ||
285 | /* remove it from the lists */ | |
286 | list_del(&cifs_file->flist); | |
287 | list_del(&cifs_file->tlist); | |
288 | ||
289 | if (list_empty(&cifsi->openFileList)) { | |
290 | cFYI(1, "closing last open instance for inode %p", | |
291 | cifs_file->dentry->d_inode); | |
292 | cifsi->clientCanCacheRead = false; | |
293 | cifsi->clientCanCacheAll = false; | |
294 | } | |
295 | spin_unlock(&cifs_file_list_lock); | |
296 | ||
297 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { | |
298 | int xid, rc; | |
299 | ||
300 | xid = GetXid(); | |
301 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
302 | FreeXid(xid); | |
303 | } | |
304 | ||
305 | /* Delete any outstanding lock records. We'll lose them when the file | |
306 | * is closed anyway. | |
307 | */ | |
308 | mutex_lock(&cifs_file->lock_mutex); | |
309 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { | |
310 | list_del(&li->llist); | |
311 | kfree(li); | |
b33879aa | 312 | } |
cdff08e7 SF |
313 | mutex_unlock(&cifs_file->lock_mutex); |
314 | ||
315 | cifs_put_tlink(cifs_file->tlink); | |
316 | dput(cifs_file->dentry); | |
317 | kfree(cifs_file); | |
b33879aa JL |
318 | } |
319 | ||
1da177e4 LT |
320 | int cifs_open(struct inode *inode, struct file *file) |
321 | { | |
322 | int rc = -EACCES; | |
590a3fe0 JL |
323 | int xid; |
324 | __u32 oplock; | |
1da177e4 | 325 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 326 | struct cifsTconInfo *tcon; |
7ffec372 | 327 | struct tcon_link *tlink; |
6ca9f3ba | 328 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 329 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
330 | char *full_path = NULL; |
331 | int desiredAccess; | |
332 | int disposition; | |
333 | __u16 netfid; | |
334 | FILE_ALL_INFO *buf = NULL; | |
335 | ||
336 | xid = GetXid(); | |
337 | ||
338 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
339 | tlink = cifs_sb_tlink(cifs_sb); |
340 | if (IS_ERR(tlink)) { | |
341 | FreeXid(xid); | |
342 | return PTR_ERR(tlink); | |
343 | } | |
344 | tcon = tlink_tcon(tlink); | |
1da177e4 | 345 | |
a6ce4932 | 346 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 347 | |
e6a00296 | 348 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 349 | if (full_path == NULL) { |
0f3bc09e | 350 | rc = -ENOMEM; |
232341ba | 351 | goto out; |
1da177e4 LT |
352 | } |
353 | ||
b6b38f70 JP |
354 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
355 | inode, file->f_flags, full_path); | |
276a74a4 SF |
356 | |
357 | if (oplockEnabled) | |
358 | oplock = REQ_OPLOCK; | |
359 | else | |
360 | oplock = 0; | |
361 | ||
64cc2c63 SF |
362 | if (!tcon->broken_posix_open && tcon->unix_ext && |
363 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
364 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
365 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 366 | /* can not refresh inode info since size could be stale */ |
2422f676 | 367 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 368 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 369 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 370 | if (rc == 0) { |
b6b38f70 | 371 | cFYI(1, "posix open succeeded"); |
47c78b7f | 372 | |
abfe1eed JL |
373 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, |
374 | oplock); | |
2422f676 JL |
375 | if (pCifsFile == NULL) { |
376 | CIFSSMBClose(xid, tcon, netfid); | |
377 | rc = -ENOMEM; | |
2422f676 | 378 | } |
9451a9a5 SJ |
379 | |
380 | cifs_fscache_set_inode_cookie(inode, file); | |
381 | ||
276a74a4 | 382 | goto out; |
64cc2c63 SF |
383 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
384 | if (tcon->ses->serverNOS) | |
b6b38f70 | 385 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
386 | " unexpected error on SMB posix open" |
387 | ", disabling posix open support." | |
388 | " Check if server update available.", | |
389 | tcon->ses->serverName, | |
b6b38f70 | 390 | tcon->ses->serverNOS); |
64cc2c63 | 391 | tcon->broken_posix_open = true; |
276a74a4 SF |
392 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
393 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
394 | goto out; | |
64cc2c63 SF |
395 | /* else fallthrough to retry open the old way on network i/o |
396 | or DFS errors */ | |
276a74a4 SF |
397 | } |
398 | ||
1da177e4 LT |
399 | desiredAccess = cifs_convert_flags(file->f_flags); |
400 | ||
401 | /********************************************************************* | |
402 | * open flag mapping table: | |
fb8c4b14 | 403 | * |
1da177e4 | 404 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 405 | * ---------- ---------------- |
1da177e4 LT |
406 | * O_CREAT FILE_OPEN_IF |
407 | * O_CREAT | O_EXCL FILE_CREATE | |
408 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
409 | * O_TRUNC FILE_OVERWRITE | |
410 | * none of the above FILE_OPEN | |
411 | * | |
412 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 413 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
414 | * O_CREAT | O_TRUNC is similar but truncates the existing |
415 | * file rather than creating a new file as FILE_SUPERSEDE does | |
416 | * (which uses the attributes / metadata passed in on open call) | |
417 | *? | |
fb8c4b14 | 418 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
419 | *? and the read write flags match reasonably. O_LARGEFILE |
420 | *? is irrelevant because largefile support is always used | |
421 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
422 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
423 | *********************************************************************/ | |
424 | ||
425 | disposition = cifs_get_disposition(file->f_flags); | |
426 | ||
1da177e4 LT |
427 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
428 | ||
429 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
430 | and calling get_inode_info with returned buf (at least helps | |
431 | non-Unix server case) */ | |
432 | ||
fb8c4b14 SF |
433 | /* BB we can not do this if this is the second open of a file |
434 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
435 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
436 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
437 | if (!buf) { | |
438 | rc = -ENOMEM; | |
439 | goto out; | |
440 | } | |
5bafd765 | 441 | |
a6e8a845 | 442 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
276a74a4 | 443 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 444 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
445 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
446 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
447 | else |
448 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
449 | ||
a9d02ad4 SF |
450 | if (rc == -EIO) { |
451 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 452 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
453 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
454 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
455 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
456 | } | |
1da177e4 | 457 | if (rc) { |
b6b38f70 | 458 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
459 | goto out; |
460 | } | |
3321b791 | 461 | |
a347ecb2 | 462 | rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid); |
47c78b7f JL |
463 | if (rc != 0) |
464 | goto out; | |
465 | ||
abfe1eed | 466 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 467 | if (pCifsFile == NULL) { |
1da177e4 LT |
468 | rc = -ENOMEM; |
469 | goto out; | |
470 | } | |
1da177e4 | 471 | |
9451a9a5 SJ |
472 | cifs_fscache_set_inode_cookie(inode, file); |
473 | ||
fb8c4b14 | 474 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
475 | /* time to set mode which we can not set earlier due to |
476 | problems creating new read-only files */ | |
276a74a4 | 477 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
478 | struct cifs_unix_set_info_args args = { |
479 | .mode = inode->i_mode, | |
480 | .uid = NO_CHANGE_64, | |
481 | .gid = NO_CHANGE_64, | |
482 | .ctime = NO_CHANGE_64, | |
483 | .atime = NO_CHANGE_64, | |
484 | .mtime = NO_CHANGE_64, | |
485 | .device = 0, | |
486 | }; | |
01ea95e3 JL |
487 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
488 | cifs_sb->local_nls, | |
489 | cifs_sb->mnt_cifs_flags & | |
737b758c | 490 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
491 | } |
492 | } | |
493 | ||
494 | out: | |
495 | kfree(buf); | |
496 | kfree(full_path); | |
497 | FreeXid(xid); | |
7ffec372 | 498 | cifs_put_tlink(tlink); |
1da177e4 LT |
499 | return rc; |
500 | } | |
501 | ||
0418726b | 502 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
503 | /* to server was lost */ |
504 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
505 | { | |
506 | int rc = 0; | |
507 | ||
508 | /* BB list all locks open on this file and relock */ | |
509 | ||
510 | return rc; | |
511 | } | |
512 | ||
15886177 | 513 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
514 | { |
515 | int rc = -EACCES; | |
590a3fe0 JL |
516 | int xid; |
517 | __u32 oplock; | |
1da177e4 | 518 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 519 | struct cifsTconInfo *tcon; |
1da177e4 | 520 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 521 | struct inode *inode; |
1da177e4 LT |
522 | char *full_path = NULL; |
523 | int desiredAccess; | |
524 | int disposition = FILE_OPEN; | |
525 | __u16 netfid; | |
526 | ||
1da177e4 | 527 | xid = GetXid(); |
f0a71eb8 | 528 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 529 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 530 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 531 | rc = 0; |
1da177e4 | 532 | FreeXid(xid); |
0f3bc09e | 533 | return rc; |
1da177e4 LT |
534 | } |
535 | ||
15886177 | 536 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 537 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 538 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 539 | |
1da177e4 LT |
540 | /* can not grab rename sem here because various ops, including |
541 | those that already have the rename sem can end up causing writepage | |
542 | to get called and if the server was down that means we end up here, | |
543 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 544 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 545 | if (full_path == NULL) { |
3a9f462f | 546 | rc = -ENOMEM; |
f0a71eb8 | 547 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 548 | FreeXid(xid); |
3a9f462f | 549 | return rc; |
1da177e4 LT |
550 | } |
551 | ||
b6b38f70 | 552 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 553 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
554 | |
555 | if (oplockEnabled) | |
556 | oplock = REQ_OPLOCK; | |
557 | else | |
4b18f2a9 | 558 | oplock = 0; |
1da177e4 | 559 | |
7fc8f4e9 SF |
560 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
561 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
562 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
563 | |
564 | /* | |
565 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
566 | * original open. Must mask them off for a reopen. | |
567 | */ | |
15886177 JL |
568 | unsigned int oflags = pCifsFile->f_flags & |
569 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 570 | |
2422f676 | 571 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
572 | cifs_sb->mnt_file_mode /* ignored */, |
573 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 574 | if (rc == 0) { |
b6b38f70 | 575 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
576 | goto reopen_success; |
577 | } | |
578 | /* fallthrough to retry open the old way on errors, especially | |
579 | in the reconnect path it is important to retry hard */ | |
580 | } | |
581 | ||
15886177 | 582 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 583 | |
1da177e4 | 584 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
585 | by SMBOpen and then calling get_inode_info with returned buf |
586 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
587 | and server version of file size can be stale. If we knew for sure |
588 | that inode was not dirty locally we could do this */ | |
589 | ||
7fc8f4e9 | 590 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 591 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 592 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 593 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 594 | if (rc) { |
f0a71eb8 | 595 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
596 | cFYI(1, "cifs_open returned 0x%x", rc); |
597 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
598 | goto reopen_error_exit; |
599 | } | |
600 | ||
7fc8f4e9 | 601 | reopen_success: |
15886177 JL |
602 | pCifsFile->netfid = netfid; |
603 | pCifsFile->invalidHandle = false; | |
604 | mutex_unlock(&pCifsFile->fh_mutex); | |
605 | pCifsInode = CIFS_I(inode); | |
606 | ||
607 | if (can_flush) { | |
608 | rc = filemap_write_and_wait(inode->i_mapping); | |
609 | if (rc != 0) | |
610 | CIFS_I(inode)->write_behind_rc = rc; | |
611 | ||
612 | pCifsInode->clientCanCacheAll = false; | |
613 | pCifsInode->clientCanCacheRead = false; | |
614 | if (tcon->unix_ext) | |
615 | rc = cifs_get_inode_info_unix(&inode, | |
616 | full_path, inode->i_sb, xid); | |
617 | else | |
618 | rc = cifs_get_inode_info(&inode, | |
619 | full_path, NULL, inode->i_sb, | |
620 | xid, NULL); | |
621 | } /* else we are writing out data to server already | |
622 | and could deadlock if we tried to flush data, and | |
623 | since we do not know if we have data that would | |
624 | invalidate the current end of file on the server | |
625 | we can not go to the server to get the new inod | |
626 | info */ | |
627 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
628 | pCifsInode->clientCanCacheAll = true; | |
629 | pCifsInode->clientCanCacheRead = true; | |
630 | cFYI(1, "Exclusive Oplock granted on inode %p", | |
631 | pCifsFile->dentry->d_inode); | |
632 | } else if ((oplock & 0xF) == OPLOCK_READ) { | |
633 | pCifsInode->clientCanCacheRead = true; | |
634 | pCifsInode->clientCanCacheAll = false; | |
635 | } else { | |
636 | pCifsInode->clientCanCacheRead = false; | |
637 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 638 | } |
15886177 JL |
639 | cifs_relock_file(pCifsFile); |
640 | ||
641 | reopen_error_exit: | |
1da177e4 LT |
642 | kfree(full_path); |
643 | FreeXid(xid); | |
644 | return rc; | |
645 | } | |
646 | ||
647 | int cifs_close(struct inode *inode, struct file *file) | |
648 | { | |
cdff08e7 SF |
649 | cifsFileInfo_put(file->private_data); |
650 | file->private_data = NULL; | |
7ee1af76 | 651 | |
cdff08e7 SF |
652 | /* return code from the ->release op is always ignored */ |
653 | return 0; | |
1da177e4 LT |
654 | } |
655 | ||
656 | int cifs_closedir(struct inode *inode, struct file *file) | |
657 | { | |
658 | int rc = 0; | |
659 | int xid; | |
c21dfb69 | 660 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
661 | char *ptmp; |
662 | ||
b6b38f70 | 663 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
664 | |
665 | xid = GetXid(); | |
666 | ||
667 | if (pCFileStruct) { | |
13cfb733 | 668 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 669 | |
b6b38f70 | 670 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 671 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
672 | if (!pCFileStruct->srch_inf.endOfSearch && |
673 | !pCFileStruct->invalidHandle) { | |
674 | pCFileStruct->invalidHandle = true; | |
4477288a | 675 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 676 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
677 | cFYI(1, "Closing uncompleted readdir with rc %d", |
678 | rc); | |
1da177e4 LT |
679 | /* not much we can do if it fails anyway, ignore rc */ |
680 | rc = 0; | |
ddb4cbfc | 681 | } else |
4477288a | 682 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
683 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
684 | if (ptmp) { | |
b6b38f70 | 685 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 686 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 687 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
688 | cifs_small_buf_release(ptmp); |
689 | else | |
690 | cifs_buf_release(ptmp); | |
1da177e4 | 691 | } |
13cfb733 | 692 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
693 | kfree(file->private_data); |
694 | file->private_data = NULL; | |
695 | } | |
696 | /* BB can we lock the filestruct while this is going on? */ | |
697 | FreeXid(xid); | |
698 | return rc; | |
699 | } | |
700 | ||
7ee1af76 JA |
701 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
702 | __u64 offset, __u8 lockType) | |
703 | { | |
fb8c4b14 SF |
704 | struct cifsLockInfo *li = |
705 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
706 | if (li == NULL) |
707 | return -ENOMEM; | |
708 | li->offset = offset; | |
709 | li->length = len; | |
710 | li->type = lockType; | |
796e5661 | 711 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 712 | list_add(&li->llist, &fid->llist); |
796e5661 | 713 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
714 | return 0; |
715 | } | |
716 | ||
1da177e4 LT |
717 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
718 | { | |
719 | int rc, xid; | |
1da177e4 LT |
720 | __u32 numLock = 0; |
721 | __u32 numUnlock = 0; | |
722 | __u64 length; | |
4b18f2a9 | 723 | bool wait_flag = false; |
1da177e4 | 724 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 725 | struct cifsTconInfo *tcon; |
08547b03 SF |
726 | __u16 netfid; |
727 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 728 | bool posix_locking = 0; |
1da177e4 LT |
729 | |
730 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
731 | rc = -EACCES; | |
732 | xid = GetXid(); | |
733 | ||
b6b38f70 | 734 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 735 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 736 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 737 | pfLock->fl_end); |
1da177e4 LT |
738 | |
739 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 740 | cFYI(1, "Posix"); |
1da177e4 | 741 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 742 | cFYI(1, "Flock"); |
1da177e4 | 743 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 744 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 745 | wait_flag = true; |
1da177e4 LT |
746 | } |
747 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
748 | cFYI(1, "Process suspended by mandatory locking - " |
749 | "not implemented yet"); | |
1da177e4 | 750 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 751 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 752 | if (pfLock->fl_flags & |
1da177e4 | 753 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 754 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
755 | |
756 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 757 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
758 | numLock = 1; |
759 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 760 | cFYI(1, "F_UNLCK"); |
1da177e4 | 761 | numUnlock = 1; |
d47d7c1a SF |
762 | /* Check if unlock includes more than |
763 | one lock range */ | |
1da177e4 | 764 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 765 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
766 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
767 | numLock = 1; | |
768 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 769 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
770 | numLock = 1; |
771 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 772 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
773 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
774 | numLock = 1; | |
775 | } else | |
b6b38f70 | 776 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 777 | |
e6a00296 | 778 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 779 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
1da177e4 LT |
780 | |
781 | if (file->private_data == NULL) { | |
0f3bc09e | 782 | rc = -EBADF; |
1da177e4 | 783 | FreeXid(xid); |
0f3bc09e | 784 | return rc; |
1da177e4 | 785 | } |
08547b03 SF |
786 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
787 | ||
13a6e42a SF |
788 | if ((tcon->ses->capabilities & CAP_UNIX) && |
789 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 790 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 791 | posix_locking = 1; |
08547b03 SF |
792 | /* BB add code here to normalize offset and length to |
793 | account for negative length which we can not accept over the | |
794 | wire */ | |
1da177e4 | 795 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 796 | if (posix_locking) { |
08547b03 | 797 | int posix_lock_type; |
fb8c4b14 | 798 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
799 | posix_lock_type = CIFS_RDLCK; |
800 | else | |
801 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 802 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 803 | length, pfLock, |
08547b03 SF |
804 | posix_lock_type, wait_flag); |
805 | FreeXid(xid); | |
806 | return rc; | |
807 | } | |
808 | ||
809 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 810 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 811 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 812 | if (rc == 0) { |
13a6e42a | 813 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
814 | pfLock->fl_start, 1 /* numUnlock */ , |
815 | 0 /* numLock */ , lockType, | |
816 | 0 /* wait flag */ ); | |
817 | pfLock->fl_type = F_UNLCK; | |
818 | if (rc != 0) | |
b6b38f70 JP |
819 | cERROR(1, "Error unlocking previously locked " |
820 | "range %d during test of lock", rc); | |
1da177e4 LT |
821 | rc = 0; |
822 | ||
823 | } else { | |
824 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
825 | rc = 0; |
826 | ||
827 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
828 | pfLock->fl_type = F_WRLCK; | |
829 | } else { | |
830 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
831 | pfLock->fl_start, 0, 1, | |
832 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
833 | 0 /* wait flag */); | |
834 | if (rc == 0) { | |
835 | rc = CIFSSMBLock(xid, tcon, netfid, | |
836 | length, pfLock->fl_start, 1, 0, | |
837 | lockType | | |
838 | LOCKING_ANDX_SHARED_LOCK, | |
839 | 0 /* wait flag */); | |
840 | pfLock->fl_type = F_RDLCK; | |
841 | if (rc != 0) | |
f19159dc | 842 | cERROR(1, "Error unlocking " |
f05337c6 | 843 | "previously locked range %d " |
f19159dc | 844 | "during test of lock", rc); |
f05337c6 PS |
845 | rc = 0; |
846 | } else { | |
847 | pfLock->fl_type = F_WRLCK; | |
848 | rc = 0; | |
849 | } | |
850 | } | |
1da177e4 LT |
851 | } |
852 | ||
853 | FreeXid(xid); | |
854 | return rc; | |
855 | } | |
7ee1af76 JA |
856 | |
857 | if (!numLock && !numUnlock) { | |
858 | /* if no lock or unlock then nothing | |
859 | to do since we do not know what it is */ | |
860 | FreeXid(xid); | |
861 | return -EOPNOTSUPP; | |
862 | } | |
863 | ||
864 | if (posix_locking) { | |
08547b03 | 865 | int posix_lock_type; |
fb8c4b14 | 866 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
867 | posix_lock_type = CIFS_RDLCK; |
868 | else | |
869 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 870 | |
fb8c4b14 | 871 | if (numUnlock == 1) |
beb84dc8 | 872 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 873 | |
13a6e42a | 874 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 875 | length, pfLock, |
08547b03 | 876 | posix_lock_type, wait_flag); |
7ee1af76 | 877 | } else { |
c21dfb69 | 878 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
879 | |
880 | if (numLock) { | |
13a6e42a | 881 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 882 | pfLock->fl_start, |
7ee1af76 JA |
883 | 0, numLock, lockType, wait_flag); |
884 | ||
885 | if (rc == 0) { | |
886 | /* For Windows locks we must store them. */ | |
887 | rc = store_file_lock(fid, length, | |
888 | pfLock->fl_start, lockType); | |
889 | } | |
890 | } else if (numUnlock) { | |
891 | /* For each stored lock that this unlock overlaps | |
892 | completely, unlock it. */ | |
893 | int stored_rc = 0; | |
894 | struct cifsLockInfo *li, *tmp; | |
895 | ||
6b70c955 | 896 | rc = 0; |
796e5661 | 897 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
898 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
899 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 900 | (pfLock->fl_start + length) >= |
39db810c | 901 | (li->offset + li->length)) { |
13a6e42a | 902 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 903 | netfid, |
7ee1af76 | 904 | li->length, li->offset, |
4b18f2a9 | 905 | 1, 0, li->type, false); |
7ee1af76 JA |
906 | if (stored_rc) |
907 | rc = stored_rc; | |
2c964d1f PS |
908 | else { |
909 | list_del(&li->llist); | |
910 | kfree(li); | |
911 | } | |
7ee1af76 JA |
912 | } |
913 | } | |
796e5661 | 914 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
915 | } |
916 | } | |
917 | ||
d634cc15 | 918 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
919 | posix_lock_file_wait(file, pfLock); |
920 | FreeXid(xid); | |
921 | return rc; | |
922 | } | |
923 | ||
fbec9ab9 JL |
924 | /* |
925 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
926 | * these calls can be very long. | |
927 | * | |
928 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
929 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
930 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
931 | * welcome if someone wants to suggest one. | |
932 | * | |
933 | * We may be able to do a better job with this if there were some way to | |
934 | * declare that a file should be sparse. | |
935 | */ | |
936 | static int | |
937 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
938 | { | |
939 | if (offset <= cifsi->server_eof) | |
940 | return CIFS_STD_OP; | |
941 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
942 | return CIFS_VLONG_OP; | |
943 | else | |
944 | return CIFS_LONG_OP; | |
945 | } | |
946 | ||
947 | /* update the file size (if needed) after a write */ | |
948 | static void | |
949 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
950 | unsigned int bytes_written) | |
951 | { | |
952 | loff_t end_of_write = offset + bytes_written; | |
953 | ||
954 | if (end_of_write > cifsi->server_eof) | |
955 | cifsi->server_eof = end_of_write; | |
956 | } | |
957 | ||
1da177e4 LT |
958 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
959 | size_t write_size, loff_t *poffset) | |
960 | { | |
961 | int rc = 0; | |
962 | unsigned int bytes_written = 0; | |
963 | unsigned int total_written; | |
964 | struct cifs_sb_info *cifs_sb; | |
965 | struct cifsTconInfo *pTcon; | |
966 | int xid, long_op; | |
967 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 968 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 969 | |
e6a00296 | 970 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 971 | |
b6b38f70 JP |
972 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
973 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
974 | |
975 | if (file->private_data == NULL) | |
976 | return -EBADF; | |
ba00ba64 | 977 | |
c21dfb69 | 978 | open_file = file->private_data; |
13cfb733 | 979 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 980 | |
838726c4 JL |
981 | rc = generic_write_checks(file, poffset, &write_size, 0); |
982 | if (rc) | |
983 | return rc; | |
984 | ||
1da177e4 | 985 | xid = GetXid(); |
1da177e4 | 986 | |
fbec9ab9 | 987 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
988 | for (total_written = 0; write_size > total_written; |
989 | total_written += bytes_written) { | |
990 | rc = -EAGAIN; | |
991 | while (rc == -EAGAIN) { | |
992 | if (file->private_data == NULL) { | |
993 | /* file has been closed on us */ | |
994 | FreeXid(xid); | |
995 | /* if we have gotten here we have written some data | |
996 | and blocked, and the file has been freed on us while | |
997 | we blocked so return what we managed to write */ | |
998 | return total_written; | |
fb8c4b14 | 999 | } |
1da177e4 | 1000 | if (open_file->invalidHandle) { |
1da177e4 LT |
1001 | /* we could deadlock if we called |
1002 | filemap_fdatawait from here so tell | |
1003 | reopen_file not to flush data to server | |
1004 | now */ | |
15886177 | 1005 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1006 | if (rc != 0) |
1007 | break; | |
1008 | } | |
1009 | ||
1010 | rc = CIFSSMBWrite(xid, pTcon, | |
1011 | open_file->netfid, | |
1012 | min_t(const int, cifs_sb->wsize, | |
1013 | write_size - total_written), | |
1014 | *poffset, &bytes_written, | |
1015 | NULL, write_data + total_written, long_op); | |
1016 | } | |
1017 | if (rc || (bytes_written == 0)) { | |
1018 | if (total_written) | |
1019 | break; | |
1020 | else { | |
1021 | FreeXid(xid); | |
1022 | return rc; | |
1023 | } | |
fbec9ab9 JL |
1024 | } else { |
1025 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1026 | *poffset += bytes_written; |
fbec9ab9 | 1027 | } |
133672ef | 1028 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1029 | 15 seconds is plenty */ |
1030 | } | |
1031 | ||
a4544347 | 1032 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1033 | |
1034 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1035 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1036 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1037 | /* Do not update local mtime - server will set its actual value on write |
1038 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1039 | * current_fs_time(inode->i_sb);*/ |
1040 | if (total_written > 0) { | |
1041 | spin_lock(&inode->i_lock); | |
1042 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1043 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1044 | *poffset); |
3677db10 | 1045 | spin_unlock(&inode->i_lock); |
1da177e4 | 1046 | } |
fb8c4b14 | 1047 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1048 | } |
1049 | FreeXid(xid); | |
1050 | return total_written; | |
1051 | } | |
1052 | ||
7da4b49a JL |
1053 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
1054 | const char *write_data, size_t write_size, | |
1055 | loff_t *poffset) | |
1da177e4 LT |
1056 | { |
1057 | int rc = 0; | |
1058 | unsigned int bytes_written = 0; | |
1059 | unsigned int total_written; | |
1060 | struct cifs_sb_info *cifs_sb; | |
1061 | struct cifsTconInfo *pTcon; | |
1062 | int xid, long_op; | |
7da4b49a JL |
1063 | struct dentry *dentry = open_file->dentry; |
1064 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 1065 | |
7da4b49a | 1066 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1067 | |
b6b38f70 | 1068 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 1069 | *poffset, dentry->d_name.name); |
1da177e4 | 1070 | |
13cfb733 | 1071 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 1072 | |
1da177e4 | 1073 | xid = GetXid(); |
1da177e4 | 1074 | |
fbec9ab9 | 1075 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1076 | for (total_written = 0; write_size > total_written; |
1077 | total_written += bytes_written) { | |
1078 | rc = -EAGAIN; | |
1079 | while (rc == -EAGAIN) { | |
1da177e4 | 1080 | if (open_file->invalidHandle) { |
1da177e4 LT |
1081 | /* we could deadlock if we called |
1082 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1083 | reopen_file not to flush data to |
1da177e4 | 1084 | server now */ |
15886177 | 1085 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1086 | if (rc != 0) |
1087 | break; | |
1088 | } | |
fb8c4b14 SF |
1089 | if (experimEnabled || (pTcon->ses->server && |
1090 | ((pTcon->ses->server->secMode & | |
08775834 | 1091 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1092 | == 0))) { |
3e84469d SF |
1093 | struct kvec iov[2]; |
1094 | unsigned int len; | |
1095 | ||
0ae0efad | 1096 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1097 | write_size - total_written); |
1098 | /* iov[0] is reserved for smb header */ | |
1099 | iov[1].iov_base = (char *)write_data + | |
1100 | total_written; | |
1101 | iov[1].iov_len = len; | |
d6e04ae6 | 1102 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1103 | open_file->netfid, len, |
d6e04ae6 | 1104 | *poffset, &bytes_written, |
3e84469d | 1105 | iov, 1, long_op); |
d6e04ae6 | 1106 | } else |
60808233 SF |
1107 | rc = CIFSSMBWrite(xid, pTcon, |
1108 | open_file->netfid, | |
1109 | min_t(const int, cifs_sb->wsize, | |
1110 | write_size - total_written), | |
1111 | *poffset, &bytes_written, | |
1112 | write_data + total_written, | |
1113 | NULL, long_op); | |
1da177e4 LT |
1114 | } |
1115 | if (rc || (bytes_written == 0)) { | |
1116 | if (total_written) | |
1117 | break; | |
1118 | else { | |
1119 | FreeXid(xid); | |
1120 | return rc; | |
1121 | } | |
fbec9ab9 JL |
1122 | } else { |
1123 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1124 | *poffset += bytes_written; |
fbec9ab9 | 1125 | } |
133672ef | 1126 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1127 | 15 seconds is plenty */ |
1128 | } | |
1129 | ||
a4544347 | 1130 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1131 | |
7da4b49a JL |
1132 | if (total_written > 0) { |
1133 | spin_lock(&dentry->d_inode->i_lock); | |
1134 | if (*poffset > dentry->d_inode->i_size) | |
1135 | i_size_write(dentry->d_inode, *poffset); | |
1136 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1137 | } |
7da4b49a | 1138 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1139 | FreeXid(xid); |
1140 | return total_written; | |
1141 | } | |
1142 | ||
630f3f0c | 1143 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
6508d904 JL |
1144 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1145 | bool fsuid_only) | |
630f3f0c SF |
1146 | { |
1147 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1148 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1149 | ||
1150 | /* only filter by fsuid on multiuser mounts */ | |
1151 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1152 | fsuid_only = false; | |
630f3f0c | 1153 | |
4477288a | 1154 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1155 | /* we could simply get the first_list_entry since write-only entries |
1156 | are always at the end of the list but since the first entry might | |
1157 | have a close pending, we go through the whole list */ | |
1158 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1159 | if (fsuid_only && open_file->uid != current_fsuid()) |
1160 | continue; | |
2e396b83 | 1161 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1162 | if (!open_file->invalidHandle) { |
1163 | /* found a good file */ | |
1164 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1165 | cifsFileInfo_get(open_file); |
4477288a | 1166 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1167 | return open_file; |
1168 | } /* else might as well continue, and look for | |
1169 | another, or simply have the caller reopen it | |
1170 | again rather than trying to fix this handle */ | |
1171 | } else /* write only file */ | |
1172 | break; /* write only files are last so must be done */ | |
1173 | } | |
4477288a | 1174 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1175 | return NULL; |
1176 | } | |
1177 | #endif | |
1178 | ||
6508d904 JL |
1179 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1180 | bool fsuid_only) | |
6148a742 SF |
1181 | { |
1182 | struct cifsFileInfo *open_file; | |
6508d904 | 1183 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
2846d386 | 1184 | bool any_available = false; |
dd99cd80 | 1185 | int rc; |
6148a742 | 1186 | |
60808233 SF |
1187 | /* Having a null inode here (because mapping->host was set to zero by |
1188 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1189 | it being zero) during stress testcases so we need to check for it */ | |
1190 | ||
fb8c4b14 | 1191 | if (cifs_inode == NULL) { |
b6b38f70 | 1192 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1193 | dump_stack(); |
1194 | return NULL; | |
1195 | } | |
1196 | ||
6508d904 JL |
1197 | /* only filter by fsuid on multiuser mounts */ |
1198 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1199 | fsuid_only = false; | |
1200 | ||
4477288a | 1201 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1202 | refind_writable: |
6148a742 | 1203 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1204 | if (!any_available && open_file->pid != current->tgid) |
1205 | continue; | |
1206 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1207 | continue; |
2e396b83 | 1208 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1209 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1210 | |
1211 | if (!open_file->invalidHandle) { | |
1212 | /* found a good writable file */ | |
4477288a | 1213 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1214 | return open_file; |
1215 | } | |
8840dee9 | 1216 | |
4477288a | 1217 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1218 | |
9b22b0b7 | 1219 | /* Had to unlock since following call can block */ |
15886177 | 1220 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1221 | if (!rc) |
1222 | return open_file; | |
9b22b0b7 | 1223 | |
cdff08e7 | 1224 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1225 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1226 | cifsFileInfo_put(open_file); |
8840dee9 | 1227 | |
cdff08e7 SF |
1228 | spin_lock(&cifs_file_list_lock); |
1229 | ||
9b22b0b7 SF |
1230 | /* else we simply continue to the next entry. Thus |
1231 | we do not loop on reopen errors. If we | |
1232 | can not reopen the file, for example if we | |
1233 | reconnected to a server with another client | |
1234 | racing to delete or lock the file we would not | |
1235 | make progress if we restarted before the beginning | |
1236 | of the loop here. */ | |
6148a742 SF |
1237 | } |
1238 | } | |
2846d386 JL |
1239 | /* couldn't find useable FH with same pid, try any available */ |
1240 | if (!any_available) { | |
1241 | any_available = true; | |
1242 | goto refind_writable; | |
1243 | } | |
4477288a | 1244 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1245 | return NULL; |
1246 | } | |
1247 | ||
1da177e4 LT |
1248 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1249 | { | |
1250 | struct address_space *mapping = page->mapping; | |
1251 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1252 | char *write_data; | |
1253 | int rc = -EFAULT; | |
1254 | int bytes_written = 0; | |
1255 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1256 | struct inode *inode; |
6148a742 | 1257 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1258 | |
1259 | if (!mapping || !mapping->host) | |
1260 | return -EFAULT; | |
1261 | ||
1262 | inode = page->mapping->host; | |
1263 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1264 | |
1265 | offset += (loff_t)from; | |
1266 | write_data = kmap(page); | |
1267 | write_data += from; | |
1268 | ||
1269 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1270 | kunmap(page); | |
1271 | return -EIO; | |
1272 | } | |
1273 | ||
1274 | /* racing with truncate? */ | |
1275 | if (offset > mapping->host->i_size) { | |
1276 | kunmap(page); | |
1277 | return 0; /* don't care */ | |
1278 | } | |
1279 | ||
1280 | /* check to make sure that we are not extending the file */ | |
1281 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1282 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1283 | |
6508d904 | 1284 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1285 | if (open_file) { |
7da4b49a JL |
1286 | bytes_written = cifs_write(open_file, write_data, |
1287 | to - from, &offset); | |
6ab409b5 | 1288 | cifsFileInfo_put(open_file); |
1da177e4 | 1289 | /* Does mm or vfs already set times? */ |
6148a742 | 1290 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1291 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1292 | rc = 0; |
bb5a9a04 SF |
1293 | else if (bytes_written < 0) |
1294 | rc = bytes_written; | |
6148a742 | 1295 | } else { |
b6b38f70 | 1296 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1297 | rc = -EIO; |
1298 | } | |
1299 | ||
1300 | kunmap(page); | |
1301 | return rc; | |
1302 | } | |
1303 | ||
1da177e4 | 1304 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1305 | struct writeback_control *wbc) |
1da177e4 | 1306 | { |
37c0eb46 SF |
1307 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1308 | unsigned int bytes_to_write; | |
1309 | unsigned int bytes_written; | |
1310 | struct cifs_sb_info *cifs_sb; | |
1311 | int done = 0; | |
111ebb6e | 1312 | pgoff_t end; |
37c0eb46 | 1313 | pgoff_t index; |
fb8c4b14 SF |
1314 | int range_whole = 0; |
1315 | struct kvec *iov; | |
84d2f07e | 1316 | int len; |
37c0eb46 SF |
1317 | int n_iov = 0; |
1318 | pgoff_t next; | |
1319 | int nr_pages; | |
1320 | __u64 offset = 0; | |
23e7dd7d | 1321 | struct cifsFileInfo *open_file; |
ba00ba64 | 1322 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1323 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1324 | struct page *page; |
1325 | struct pagevec pvec; | |
1326 | int rc = 0; | |
1327 | int scanned = 0; | |
fbec9ab9 | 1328 | int xid, long_op; |
1da177e4 | 1329 | |
f3983c21 JL |
1330 | /* |
1331 | * BB: Is this meaningful for a non-block-device file system? | |
1332 | * If it is, we should test it again after we do I/O | |
1333 | */ | |
1334 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1335 | wbc->encountered_congestion = 1; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
37c0eb46 | 1339 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1340 | |
37c0eb46 SF |
1341 | /* |
1342 | * If wsize is smaller that the page cache size, default to writing | |
1343 | * one page at a time via cifs_writepage | |
1344 | */ | |
1345 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1346 | return generic_writepages(mapping, wbc); | |
1347 | ||
9a0c8230 | 1348 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1349 | if (iov == NULL) |
9a0c8230 SF |
1350 | return generic_writepages(mapping, wbc); |
1351 | ||
37c0eb46 | 1352 | /* |
f3983c21 JL |
1353 | * if there's no open file, then this is likely to fail too, |
1354 | * but it'll at least handle the return. Maybe it should be | |
1355 | * a BUG() instead? | |
37c0eb46 | 1356 | */ |
6508d904 | 1357 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1358 | if (!open_file) { |
9a0c8230 | 1359 | kfree(iov); |
f3983c21 JL |
1360 | return generic_writepages(mapping, wbc); |
1361 | } | |
1362 | ||
13cfb733 | 1363 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1364 | if (!experimEnabled && tcon->ses->server->secMode & |
1365 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1366 | cifsFileInfo_put(open_file); | |
1367 | return generic_writepages(mapping, wbc); | |
37c0eb46 | 1368 | } |
f3983c21 | 1369 | cifsFileInfo_put(open_file); |
37c0eb46 | 1370 | |
1da177e4 LT |
1371 | xid = GetXid(); |
1372 | ||
37c0eb46 | 1373 | pagevec_init(&pvec, 0); |
111ebb6e | 1374 | if (wbc->range_cyclic) { |
37c0eb46 | 1375 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1376 | end = -1; |
1377 | } else { | |
1378 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1379 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1380 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1381 | range_whole = 1; | |
37c0eb46 SF |
1382 | scanned = 1; |
1383 | } | |
1384 | retry: | |
1385 | while (!done && (index <= end) && | |
1386 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1387 | PAGECACHE_TAG_DIRTY, | |
1388 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1389 | int first; | |
1390 | unsigned int i; | |
1391 | ||
37c0eb46 SF |
1392 | first = -1; |
1393 | next = 0; | |
1394 | n_iov = 0; | |
1395 | bytes_to_write = 0; | |
1396 | ||
1397 | for (i = 0; i < nr_pages; i++) { | |
1398 | page = pvec.pages[i]; | |
1399 | /* | |
1400 | * At this point we hold neither mapping->tree_lock nor | |
1401 | * lock on the page itself: the page may be truncated or | |
1402 | * invalidated (changing page->mapping to NULL), or even | |
1403 | * swizzled back from swapper_space to tmpfs file | |
1404 | * mapping | |
1405 | */ | |
1406 | ||
1407 | if (first < 0) | |
1408 | lock_page(page); | |
529ae9aa | 1409 | else if (!trylock_page(page)) |
37c0eb46 SF |
1410 | break; |
1411 | ||
1412 | if (unlikely(page->mapping != mapping)) { | |
1413 | unlock_page(page); | |
1414 | break; | |
1415 | } | |
1416 | ||
111ebb6e | 1417 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1418 | done = 1; |
1419 | unlock_page(page); | |
1420 | break; | |
1421 | } | |
1422 | ||
1423 | if (next && (page->index != next)) { | |
1424 | /* Not next consecutive page */ | |
1425 | unlock_page(page); | |
1426 | break; | |
1427 | } | |
1428 | ||
1429 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1430 | wait_on_page_writeback(page); | |
1431 | ||
1432 | if (PageWriteback(page) || | |
cb876f45 | 1433 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1434 | unlock_page(page); |
1435 | break; | |
1436 | } | |
84d2f07e | 1437 | |
cb876f45 LT |
1438 | /* |
1439 | * This actually clears the dirty bit in the radix tree. | |
1440 | * See cifs_writepage() for more commentary. | |
1441 | */ | |
1442 | set_page_writeback(page); | |
1443 | ||
84d2f07e SF |
1444 | if (page_offset(page) >= mapping->host->i_size) { |
1445 | done = 1; | |
1446 | unlock_page(page); | |
cb876f45 | 1447 | end_page_writeback(page); |
84d2f07e SF |
1448 | break; |
1449 | } | |
1450 | ||
37c0eb46 SF |
1451 | /* |
1452 | * BB can we get rid of this? pages are held by pvec | |
1453 | */ | |
1454 | page_cache_get(page); | |
1455 | ||
84d2f07e SF |
1456 | len = min(mapping->host->i_size - page_offset(page), |
1457 | (loff_t)PAGE_CACHE_SIZE); | |
1458 | ||
37c0eb46 SF |
1459 | /* reserve iov[0] for the smb header */ |
1460 | n_iov++; | |
1461 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1462 | iov[n_iov].iov_len = len; |
1463 | bytes_to_write += len; | |
37c0eb46 SF |
1464 | |
1465 | if (first < 0) { | |
1466 | first = i; | |
1467 | offset = page_offset(page); | |
1468 | } | |
1469 | next = page->index + 1; | |
1470 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1471 | break; | |
1472 | } | |
1473 | if (n_iov) { | |
6508d904 JL |
1474 | open_file = find_writable_file(CIFS_I(mapping->host), |
1475 | false); | |
23e7dd7d | 1476 | if (!open_file) { |
b6b38f70 | 1477 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1478 | rc = -EBADF; |
1047abc1 | 1479 | } else { |
fbec9ab9 | 1480 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1481 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1482 | bytes_to_write, offset, |
1483 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1484 | long_op); |
6ab409b5 | 1485 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1486 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1487 | } |
fbec9ab9 | 1488 | |
f3983c21 JL |
1489 | if (rc || bytes_written < bytes_to_write) { |
1490 | cERROR(1, "Write2 ret %d, wrote %d", | |
1491 | rc, bytes_written); | |
1492 | /* BB what if continued retry is | |
1493 | requested via mount flags? */ | |
1494 | if (rc == -ENOSPC) | |
1495 | set_bit(AS_ENOSPC, &mapping->flags); | |
1496 | else | |
1497 | set_bit(AS_EIO, &mapping->flags); | |
1498 | } else { | |
1499 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1500 | } |
f3983c21 | 1501 | |
37c0eb46 SF |
1502 | for (i = 0; i < n_iov; i++) { |
1503 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1504 | /* Should we also set page error on |
1505 | success rc but too little data written? */ | |
1506 | /* BB investigate retry logic on temporary | |
1507 | server crash cases and how recovery works | |
fb8c4b14 SF |
1508 | when page marked as error */ |
1509 | if (rc) | |
eb9bdaa3 | 1510 | SetPageError(page); |
37c0eb46 SF |
1511 | kunmap(page); |
1512 | unlock_page(page); | |
cb876f45 | 1513 | end_page_writeback(page); |
37c0eb46 SF |
1514 | page_cache_release(page); |
1515 | } | |
1516 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1517 | done = 1; | |
1518 | index = next; | |
b066a48c DK |
1519 | } else |
1520 | /* Need to re-find the pages we skipped */ | |
1521 | index = pvec.pages[0]->index + 1; | |
1522 | ||
37c0eb46 SF |
1523 | pagevec_release(&pvec); |
1524 | } | |
1525 | if (!scanned && !done) { | |
1526 | /* | |
1527 | * We hit the last page and there is more work to be done: wrap | |
1528 | * back to the start of the file | |
1529 | */ | |
1530 | scanned = 1; | |
1531 | index = 0; | |
1532 | goto retry; | |
1533 | } | |
111ebb6e | 1534 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1535 | mapping->writeback_index = index; |
1536 | ||
1da177e4 | 1537 | FreeXid(xid); |
9a0c8230 | 1538 | kfree(iov); |
1da177e4 LT |
1539 | return rc; |
1540 | } | |
1da177e4 | 1541 | |
fb8c4b14 | 1542 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1543 | { |
1544 | int rc = -EFAULT; | |
1545 | int xid; | |
1546 | ||
1547 | xid = GetXid(); | |
1548 | /* BB add check for wbc flags */ | |
1549 | page_cache_get(page); | |
ad7a2926 | 1550 | if (!PageUptodate(page)) |
b6b38f70 | 1551 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1552 | |
1553 | /* | |
1554 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1555 | * | |
1556 | * A writepage() implementation always needs to do either this, | |
1557 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1558 | * the case of a failure. | |
1559 | * | |
1560 | * Just unlocking the page will cause the radix tree tag-bits | |
1561 | * to fail to update with the state of the page correctly. | |
1562 | */ | |
fb8c4b14 | 1563 | set_page_writeback(page); |
1da177e4 LT |
1564 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1565 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1566 | unlock_page(page); | |
cb876f45 LT |
1567 | end_page_writeback(page); |
1568 | page_cache_release(page); | |
1da177e4 LT |
1569 | FreeXid(xid); |
1570 | return rc; | |
1571 | } | |
1572 | ||
d9414774 NP |
1573 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1574 | loff_t pos, unsigned len, unsigned copied, | |
1575 | struct page *page, void *fsdata) | |
1da177e4 | 1576 | { |
d9414774 NP |
1577 | int rc; |
1578 | struct inode *inode = mapping->host; | |
1da177e4 | 1579 | |
b6b38f70 JP |
1580 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1581 | page, pos, copied); | |
d9414774 | 1582 | |
a98ee8c1 JL |
1583 | if (PageChecked(page)) { |
1584 | if (copied == len) | |
1585 | SetPageUptodate(page); | |
1586 | ClearPageChecked(page); | |
1587 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1588 | SetPageUptodate(page); |
ad7a2926 | 1589 | |
1da177e4 | 1590 | if (!PageUptodate(page)) { |
d9414774 NP |
1591 | char *page_data; |
1592 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1593 | int xid; | |
1594 | ||
1595 | xid = GetXid(); | |
1da177e4 LT |
1596 | /* this is probably better than directly calling |
1597 | partialpage_write since in this function the file handle is | |
1598 | known which we might as well leverage */ | |
1599 | /* BB check if anything else missing out of ppw | |
1600 | such as updating last write time */ | |
1601 | page_data = kmap(page); | |
7da4b49a JL |
1602 | rc = cifs_write(file->private_data, page_data + offset, |
1603 | copied, &pos); | |
d9414774 | 1604 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1605 | kunmap(page); |
d9414774 NP |
1606 | |
1607 | FreeXid(xid); | |
fb8c4b14 | 1608 | } else { |
d9414774 NP |
1609 | rc = copied; |
1610 | pos += copied; | |
1da177e4 LT |
1611 | set_page_dirty(page); |
1612 | } | |
1613 | ||
d9414774 NP |
1614 | if (rc > 0) { |
1615 | spin_lock(&inode->i_lock); | |
1616 | if (pos > inode->i_size) | |
1617 | i_size_write(inode, pos); | |
1618 | spin_unlock(&inode->i_lock); | |
1619 | } | |
1620 | ||
1621 | unlock_page(page); | |
1622 | page_cache_release(page); | |
1623 | ||
1da177e4 LT |
1624 | return rc; |
1625 | } | |
1626 | ||
7ea80859 | 1627 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1628 | { |
1629 | int xid; | |
1630 | int rc = 0; | |
b298f223 | 1631 | struct cifsTconInfo *tcon; |
c21dfb69 | 1632 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1633 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1634 | |
1635 | xid = GetXid(); | |
1636 | ||
b6b38f70 | 1637 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1638 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1639 | |
cea21805 JL |
1640 | rc = filemap_write_and_wait(inode->i_mapping); |
1641 | if (rc == 0) { | |
1642 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1643 | CIFS_I(inode)->write_behind_rc = 0; |
13cfb733 | 1644 | tcon = tlink_tcon(smbfile->tlink); |
be652445 | 1645 | if (!rc && tcon && smbfile && |
4717bed6 | 1646 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1647 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1648 | } |
b298f223 | 1649 | |
1da177e4 LT |
1650 | FreeXid(xid); |
1651 | return rc; | |
1652 | } | |
1653 | ||
3978d717 | 1654 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1655 | { |
1656 | struct address_space *mapping; | |
1657 | struct inode *inode; | |
1658 | unsigned long index = page->index; | |
1659 | unsigned int rpages = 0; | |
1660 | int rc = 0; | |
1661 | ||
f19159dc | 1662 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1663 | mapping = page->mapping; |
1664 | if (!mapping) | |
1665 | return 0; | |
1666 | inode = mapping->host; | |
1667 | if (!inode) | |
3978d717 | 1668 | return; */ |
1da177e4 | 1669 | |
fb8c4b14 | 1670 | /* fill in rpages then |
1da177e4 LT |
1671 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1672 | ||
b6b38f70 | 1673 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1674 | |
3978d717 | 1675 | #if 0 |
1da177e4 LT |
1676 | if (rc < 0) |
1677 | return rc; | |
1678 | return 0; | |
3978d717 | 1679 | #endif |
1da177e4 LT |
1680 | } */ |
1681 | ||
1682 | /* | |
1683 | * As file closes, flush all cached write data for this inode checking | |
1684 | * for write behind errors. | |
1685 | */ | |
75e1fcc0 | 1686 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1687 | { |
fb8c4b14 | 1688 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1689 | int rc = 0; |
1690 | ||
1691 | /* Rather than do the steps manually: | |
1692 | lock the inode for writing | |
1693 | loop through pages looking for write behind data (dirty pages) | |
1694 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1695 | send to server (prefer in parallel) | |
1696 | deal with writebehind errors | |
1697 | unlock inode for writing | |
1698 | filemapfdatawrite appears easier for the time being */ | |
1699 | ||
1700 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1701 | /* reset wb rc if we were able to write out dirty pages */ |
1702 | if (!rc) { | |
1703 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1704 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1705 | } |
50c2f753 | 1706 | |
b6b38f70 | 1707 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1708 | |
1709 | return rc; | |
1710 | } | |
1711 | ||
1712 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1713 | size_t read_size, loff_t *poffset) | |
1714 | { | |
1715 | int rc = -EACCES; | |
1716 | unsigned int bytes_read = 0; | |
1717 | unsigned int total_read = 0; | |
1718 | unsigned int current_read_size; | |
1719 | struct cifs_sb_info *cifs_sb; | |
1720 | struct cifsTconInfo *pTcon; | |
1721 | int xid; | |
1722 | struct cifsFileInfo *open_file; | |
1723 | char *smb_read_data; | |
1724 | char __user *current_offset; | |
1725 | struct smb_com_read_rsp *pSMBr; | |
1726 | ||
1727 | xid = GetXid(); | |
e6a00296 | 1728 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1729 | |
1730 | if (file->private_data == NULL) { | |
0f3bc09e | 1731 | rc = -EBADF; |
1da177e4 | 1732 | FreeXid(xid); |
0f3bc09e | 1733 | return rc; |
1da177e4 | 1734 | } |
c21dfb69 | 1735 | open_file = file->private_data; |
13cfb733 | 1736 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1737 | |
ad7a2926 | 1738 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1739 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1740 | |
1da177e4 LT |
1741 | for (total_read = 0, current_offset = read_data; |
1742 | read_size > total_read; | |
1743 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1744 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1745 | cifs_sb->rsize); |
1746 | rc = -EAGAIN; | |
1747 | smb_read_data = NULL; | |
1748 | while (rc == -EAGAIN) { | |
ec637e3f | 1749 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1750 | if (open_file->invalidHandle) { |
15886177 | 1751 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1752 | if (rc != 0) |
1753 | break; | |
1754 | } | |
bfa0d75a | 1755 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1756 | open_file->netfid, |
1757 | current_read_size, *poffset, | |
1758 | &bytes_read, &smb_read_data, | |
1759 | &buf_type); | |
1da177e4 | 1760 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1761 | if (smb_read_data) { |
93544cc6 SF |
1762 | if (copy_to_user(current_offset, |
1763 | smb_read_data + | |
1764 | 4 /* RFC1001 length field */ + | |
1765 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1766 | bytes_read)) |
93544cc6 | 1767 | rc = -EFAULT; |
93544cc6 | 1768 | |
fb8c4b14 | 1769 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1770 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1771 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1772 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1773 | smb_read_data = NULL; |
1774 | } | |
1775 | } | |
1776 | if (rc || (bytes_read == 0)) { | |
1777 | if (total_read) { | |
1778 | break; | |
1779 | } else { | |
1780 | FreeXid(xid); | |
1781 | return rc; | |
1782 | } | |
1783 | } else { | |
a4544347 | 1784 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1785 | *poffset += bytes_read; |
1786 | } | |
1787 | } | |
1788 | FreeXid(xid); | |
1789 | return total_read; | |
1790 | } | |
1791 | ||
1792 | ||
1793 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1794 | loff_t *poffset) | |
1795 | { | |
1796 | int rc = -EACCES; | |
1797 | unsigned int bytes_read = 0; | |
1798 | unsigned int total_read; | |
1799 | unsigned int current_read_size; | |
1800 | struct cifs_sb_info *cifs_sb; | |
1801 | struct cifsTconInfo *pTcon; | |
1802 | int xid; | |
1803 | char *current_offset; | |
1804 | struct cifsFileInfo *open_file; | |
ec637e3f | 1805 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1806 | |
1807 | xid = GetXid(); | |
e6a00296 | 1808 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1809 | |
1810 | if (file->private_data == NULL) { | |
0f3bc09e | 1811 | rc = -EBADF; |
1da177e4 | 1812 | FreeXid(xid); |
0f3bc09e | 1813 | return rc; |
1da177e4 | 1814 | } |
c21dfb69 | 1815 | open_file = file->private_data; |
13cfb733 | 1816 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1817 | |
1818 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1819 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1820 | |
fb8c4b14 | 1821 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1822 | read_size > total_read; |
1823 | total_read += bytes_read, current_offset += bytes_read) { | |
1824 | current_read_size = min_t(const int, read_size - total_read, | |
1825 | cifs_sb->rsize); | |
f9f5c817 SF |
1826 | /* For windows me and 9x we do not want to request more |
1827 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1828 | if ((pTcon->ses) && |
f9f5c817 SF |
1829 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1830 | current_read_size = min_t(const int, current_read_size, | |
1831 | pTcon->ses->server->maxBuf - 128); | |
1832 | } | |
1da177e4 LT |
1833 | rc = -EAGAIN; |
1834 | while (rc == -EAGAIN) { | |
cdff08e7 | 1835 | if (open_file->invalidHandle) { |
15886177 | 1836 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1837 | if (rc != 0) |
1838 | break; | |
1839 | } | |
bfa0d75a | 1840 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1841 | open_file->netfid, |
1842 | current_read_size, *poffset, | |
1843 | &bytes_read, ¤t_offset, | |
1844 | &buf_type); | |
1da177e4 LT |
1845 | } |
1846 | if (rc || (bytes_read == 0)) { | |
1847 | if (total_read) { | |
1848 | break; | |
1849 | } else { | |
1850 | FreeXid(xid); | |
1851 | return rc; | |
1852 | } | |
1853 | } else { | |
a4544347 | 1854 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1855 | *poffset += bytes_read; |
1856 | } | |
1857 | } | |
1858 | FreeXid(xid); | |
1859 | return total_read; | |
1860 | } | |
1861 | ||
1862 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1863 | { | |
1da177e4 LT |
1864 | int rc, xid; |
1865 | ||
1866 | xid = GetXid(); | |
abab095d | 1867 | rc = cifs_revalidate_file(file); |
1da177e4 | 1868 | if (rc) { |
b6b38f70 | 1869 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1870 | FreeXid(xid); |
1871 | return rc; | |
1872 | } | |
1873 | rc = generic_file_mmap(file, vma); | |
1874 | FreeXid(xid); | |
1875 | return rc; | |
1876 | } | |
1877 | ||
1878 | ||
fb8c4b14 | 1879 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1880 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1881 | { |
1882 | struct page *page; | |
1883 | char *target; | |
1884 | ||
1885 | while (bytes_read > 0) { | |
1886 | if (list_empty(pages)) | |
1887 | break; | |
1888 | ||
1889 | page = list_entry(pages->prev, struct page, lru); | |
1890 | list_del(&page->lru); | |
1891 | ||
315e995c | 1892 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1893 | GFP_KERNEL)) { |
1894 | page_cache_release(page); | |
b6b38f70 | 1895 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1896 | data += PAGE_CACHE_SIZE; |
1897 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1898 | continue; |
1899 | } | |
06b43672 | 1900 | page_cache_release(page); |
1da177e4 | 1901 | |
fb8c4b14 | 1902 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1903 | |
1904 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1905 | memcpy(target, data, bytes_read); | |
1906 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1907 | memset(target + bytes_read, 0, |
1da177e4 LT |
1908 | PAGE_CACHE_SIZE - bytes_read); |
1909 | bytes_read = 0; | |
1910 | } else { | |
1911 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1912 | bytes_read -= PAGE_CACHE_SIZE; | |
1913 | } | |
1914 | kunmap_atomic(target, KM_USER0); | |
1915 | ||
1916 | flush_dcache_page(page); | |
1917 | SetPageUptodate(page); | |
1918 | unlock_page(page); | |
1da177e4 | 1919 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1920 | |
1921 | /* add page to FS-Cache */ | |
1922 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1923 | } |
1924 | return; | |
1925 | } | |
1926 | ||
1927 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1928 | struct list_head *page_list, unsigned num_pages) | |
1929 | { | |
1930 | int rc = -EACCES; | |
1931 | int xid; | |
1932 | loff_t offset; | |
1933 | struct page *page; | |
1934 | struct cifs_sb_info *cifs_sb; | |
1935 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1936 | unsigned int bytes_read = 0; |
fb8c4b14 | 1937 | unsigned int read_size, i; |
1da177e4 LT |
1938 | char *smb_read_data = NULL; |
1939 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1940 | struct cifsFileInfo *open_file; |
ec637e3f | 1941 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1942 | |
1943 | xid = GetXid(); | |
1944 | if (file->private_data == NULL) { | |
0f3bc09e | 1945 | rc = -EBADF; |
1da177e4 | 1946 | FreeXid(xid); |
0f3bc09e | 1947 | return rc; |
1da177e4 | 1948 | } |
c21dfb69 | 1949 | open_file = file->private_data; |
e6a00296 | 1950 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1951 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1952 | |
56698236 SJ |
1953 | /* |
1954 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1955 | * immediately if the cookie is negative | |
1956 | */ | |
1957 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1958 | &num_pages); | |
1959 | if (rc == 0) | |
1960 | goto read_complete; | |
1961 | ||
f19159dc | 1962 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1963 | for (i = 0; i < num_pages; ) { |
1964 | unsigned contig_pages; | |
1965 | struct page *tmp_page; | |
1966 | unsigned long expected_index; | |
1967 | ||
1968 | if (list_empty(page_list)) | |
1969 | break; | |
1970 | ||
1971 | page = list_entry(page_list->prev, struct page, lru); | |
1972 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1973 | ||
1974 | /* count adjacent pages that we will read into */ | |
1975 | contig_pages = 0; | |
fb8c4b14 | 1976 | expected_index = |
1da177e4 | 1977 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1978 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1979 | if (tmp_page->index == expected_index) { |
1980 | contig_pages++; | |
1981 | expected_index++; | |
1982 | } else | |
fb8c4b14 | 1983 | break; |
1da177e4 LT |
1984 | } |
1985 | if (contig_pages + i > num_pages) | |
1986 | contig_pages = num_pages - i; | |
1987 | ||
1988 | /* for reads over a certain size could initiate async | |
1989 | read ahead */ | |
1990 | ||
1991 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1992 | /* Read size needs to be in multiples of one page */ | |
1993 | read_size = min_t(const unsigned int, read_size, | |
1994 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
1995 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
1996 | read_size, contig_pages); | |
1da177e4 LT |
1997 | rc = -EAGAIN; |
1998 | while (rc == -EAGAIN) { | |
cdff08e7 | 1999 | if (open_file->invalidHandle) { |
15886177 | 2000 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2001 | if (rc != 0) |
2002 | break; | |
2003 | } | |
2004 | ||
bfa0d75a | 2005 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2006 | open_file->netfid, |
2007 | read_size, offset, | |
2008 | &bytes_read, &smb_read_data, | |
2009 | &buf_type); | |
a9d02ad4 | 2010 | /* BB more RC checks ? */ |
fb8c4b14 | 2011 | if (rc == -EAGAIN) { |
1da177e4 | 2012 | if (smb_read_data) { |
fb8c4b14 | 2013 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2014 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2015 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2016 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2017 | smb_read_data = NULL; |
2018 | } | |
2019 | } | |
2020 | } | |
2021 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2022 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2023 | break; |
2024 | } else if (bytes_read > 0) { | |
6f88cc2e | 2025 | task_io_account_read(bytes_read); |
1da177e4 LT |
2026 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2027 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2028 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2029 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2030 | |
2031 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2032 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2033 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2034 | i++; /* account for partial page */ |
2035 | ||
fb8c4b14 | 2036 | /* server copy of file can have smaller size |
1da177e4 | 2037 | than client */ |
fb8c4b14 SF |
2038 | /* BB do we need to verify this common case ? |
2039 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2040 | we will hit it on next read */ |
2041 | ||
05ac9d4b | 2042 | /* break; */ |
1da177e4 LT |
2043 | } |
2044 | } else { | |
b6b38f70 | 2045 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2046 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2047 | bytes_read, offset); |
fb8c4b14 | 2048 | /* BB turn off caching and do new lookup on |
1da177e4 | 2049 | file size at server? */ |
1da177e4 LT |
2050 | break; |
2051 | } | |
2052 | if (smb_read_data) { | |
fb8c4b14 | 2053 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2054 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2055 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2056 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2057 | smb_read_data = NULL; |
2058 | } | |
2059 | bytes_read = 0; | |
2060 | } | |
2061 | ||
1da177e4 LT |
2062 | /* need to free smb_read_data buf before exit */ |
2063 | if (smb_read_data) { | |
fb8c4b14 | 2064 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2065 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2066 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2067 | cifs_buf_release(smb_read_data); |
1da177e4 | 2068 | smb_read_data = NULL; |
fb8c4b14 | 2069 | } |
1da177e4 | 2070 | |
56698236 | 2071 | read_complete: |
1da177e4 LT |
2072 | FreeXid(xid); |
2073 | return rc; | |
2074 | } | |
2075 | ||
2076 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2077 | loff_t *poffset) | |
2078 | { | |
2079 | char *read_data; | |
2080 | int rc; | |
2081 | ||
56698236 SJ |
2082 | /* Is the page cached? */ |
2083 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2084 | if (rc == 0) | |
2085 | goto read_complete; | |
2086 | ||
1da177e4 LT |
2087 | page_cache_get(page); |
2088 | read_data = kmap(page); | |
2089 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2090 | |
1da177e4 | 2091 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2092 | |
1da177e4 LT |
2093 | if (rc < 0) |
2094 | goto io_error; | |
2095 | else | |
b6b38f70 | 2096 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2097 | |
e6a00296 JJS |
2098 | file->f_path.dentry->d_inode->i_atime = |
2099 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2100 | |
1da177e4 LT |
2101 | if (PAGE_CACHE_SIZE > rc) |
2102 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2103 | ||
2104 | flush_dcache_page(page); | |
2105 | SetPageUptodate(page); | |
9dc06558 SJ |
2106 | |
2107 | /* send this page to the cache */ | |
2108 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2109 | ||
1da177e4 | 2110 | rc = 0; |
fb8c4b14 | 2111 | |
1da177e4 | 2112 | io_error: |
fb8c4b14 | 2113 | kunmap(page); |
1da177e4 | 2114 | page_cache_release(page); |
56698236 SJ |
2115 | |
2116 | read_complete: | |
1da177e4 LT |
2117 | return rc; |
2118 | } | |
2119 | ||
2120 | static int cifs_readpage(struct file *file, struct page *page) | |
2121 | { | |
2122 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2123 | int rc = -EACCES; | |
2124 | int xid; | |
2125 | ||
2126 | xid = GetXid(); | |
2127 | ||
2128 | if (file->private_data == NULL) { | |
0f3bc09e | 2129 | rc = -EBADF; |
1da177e4 | 2130 | FreeXid(xid); |
0f3bc09e | 2131 | return rc; |
1da177e4 LT |
2132 | } |
2133 | ||
b6b38f70 JP |
2134 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2135 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2136 | |
2137 | rc = cifs_readpage_worker(file, page, &offset); | |
2138 | ||
2139 | unlock_page(page); | |
2140 | ||
2141 | FreeXid(xid); | |
2142 | return rc; | |
2143 | } | |
2144 | ||
a403a0a3 SF |
2145 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2146 | { | |
2147 | struct cifsFileInfo *open_file; | |
2148 | ||
4477288a | 2149 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2150 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2151 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2152 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2153 | return 1; |
2154 | } | |
2155 | } | |
4477288a | 2156 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2157 | return 0; |
2158 | } | |
2159 | ||
1da177e4 LT |
2160 | /* We do not want to update the file size from server for inodes |
2161 | open for write - to avoid races with writepage extending | |
2162 | the file - in the future we could consider allowing | |
fb8c4b14 | 2163 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2164 | but this is tricky to do without racing with writebehind |
2165 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2166 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2167 | { |
a403a0a3 | 2168 | if (!cifsInode) |
4b18f2a9 | 2169 | return true; |
50c2f753 | 2170 | |
a403a0a3 SF |
2171 | if (is_inode_writable(cifsInode)) { |
2172 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2173 | struct cifs_sb_info *cifs_sb; |
2174 | ||
c32a0b68 | 2175 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2176 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2177 | /* since no page cache to corrupt on directio |
c32a0b68 | 2178 | we can change size safely */ |
4b18f2a9 | 2179 | return true; |
c32a0b68 SF |
2180 | } |
2181 | ||
fb8c4b14 | 2182 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2183 | return true; |
7ba52631 | 2184 | |
4b18f2a9 | 2185 | return false; |
23e7dd7d | 2186 | } else |
4b18f2a9 | 2187 | return true; |
1da177e4 LT |
2188 | } |
2189 | ||
d9414774 NP |
2190 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2191 | loff_t pos, unsigned len, unsigned flags, | |
2192 | struct page **pagep, void **fsdata) | |
1da177e4 | 2193 | { |
d9414774 NP |
2194 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2195 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2196 | loff_t page_start = pos & PAGE_MASK; |
2197 | loff_t i_size; | |
2198 | struct page *page; | |
2199 | int rc = 0; | |
d9414774 | 2200 | |
b6b38f70 | 2201 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2202 | |
54566b2c | 2203 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2204 | if (!page) { |
2205 | rc = -ENOMEM; | |
2206 | goto out; | |
2207 | } | |
8a236264 | 2208 | |
a98ee8c1 JL |
2209 | if (PageUptodate(page)) |
2210 | goto out; | |
8a236264 | 2211 | |
a98ee8c1 JL |
2212 | /* |
2213 | * If we write a full page it will be up to date, no need to read from | |
2214 | * the server. If the write is short, we'll end up doing a sync write | |
2215 | * instead. | |
2216 | */ | |
2217 | if (len == PAGE_CACHE_SIZE) | |
2218 | goto out; | |
8a236264 | 2219 | |
a98ee8c1 JL |
2220 | /* |
2221 | * optimize away the read when we have an oplock, and we're not | |
2222 | * expecting to use any of the data we'd be reading in. That | |
2223 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2224 | * and the write will cover all of the existing data. | |
2225 | */ | |
2226 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2227 | i_size = i_size_read(mapping->host); | |
2228 | if (page_start >= i_size || | |
2229 | (offset == 0 && (pos + len) >= i_size)) { | |
2230 | zero_user_segments(page, 0, offset, | |
2231 | offset + len, | |
2232 | PAGE_CACHE_SIZE); | |
2233 | /* | |
2234 | * PageChecked means that the parts of the page | |
2235 | * to which we're not writing are considered up | |
2236 | * to date. Once the data is copied to the | |
2237 | * page, it can be set uptodate. | |
2238 | */ | |
2239 | SetPageChecked(page); | |
2240 | goto out; | |
2241 | } | |
2242 | } | |
d9414774 | 2243 | |
a98ee8c1 JL |
2244 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2245 | /* | |
2246 | * might as well read a page, it is fast enough. If we get | |
2247 | * an error, we don't need to return it. cifs_write_end will | |
2248 | * do a sync write instead since PG_uptodate isn't set. | |
2249 | */ | |
2250 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2251 | } else { |
2252 | /* we could try using another file handle if there is one - | |
2253 | but how would we lock it to prevent close of that handle | |
2254 | racing with this read? In any case | |
d9414774 | 2255 | this will be written out by write_end so is fine */ |
1da177e4 | 2256 | } |
a98ee8c1 JL |
2257 | out: |
2258 | *pagep = page; | |
2259 | return rc; | |
1da177e4 LT |
2260 | } |
2261 | ||
85f2d6b4 SJ |
2262 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2263 | { | |
2264 | if (PagePrivate(page)) | |
2265 | return 0; | |
2266 | ||
2267 | return cifs_fscache_release_page(page, gfp); | |
2268 | } | |
2269 | ||
2270 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2271 | { | |
2272 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2273 | ||
2274 | if (offset == 0) | |
2275 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2276 | } | |
2277 | ||
9b646972 | 2278 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2279 | { |
2280 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2281 | oplock_break); | |
a5e18bc3 | 2282 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2283 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3bc303c2 JL |
2284 | int rc, waitrc = 0; |
2285 | ||
2286 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2287 | if (cinode->clientCanCacheRead) |
8737c930 | 2288 | break_lease(inode, O_RDONLY); |
d54ff732 | 2289 | else |
8737c930 | 2290 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2291 | rc = filemap_fdatawrite(inode->i_mapping); |
2292 | if (cinode->clientCanCacheRead == 0) { | |
2293 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2294 | invalidate_remote_inode(inode); | |
2295 | } | |
2296 | if (!rc) | |
2297 | rc = waitrc; | |
2298 | if (rc) | |
2299 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2300 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2301 | } |
2302 | ||
2303 | /* | |
2304 | * releasing stale oplock after recent reconnect of smb session using | |
2305 | * a now incorrect file handle is not a data integrity issue but do | |
2306 | * not bother sending an oplock release if session to server still is | |
2307 | * disconnected since oplock already released by the server | |
2308 | */ | |
cdff08e7 | 2309 | if (!cfile->oplock_break_cancelled) { |
13cfb733 JL |
2310 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2311 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2312 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2313 | } |
9b646972 TH |
2314 | |
2315 | /* | |
2316 | * We might have kicked in before is_valid_oplock_break() | |
2317 | * finished grabbing reference for us. Make sure it's done by | |
2318 | * waiting for GlobalSMSSeslock. | |
2319 | */ | |
4477288a JL |
2320 | spin_lock(&cifs_file_list_lock); |
2321 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2322 | |
2323 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2324 | } |
2325 | ||
5f6dbc9e | 2326 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2327 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2328 | { |
d7c86ff8 | 2329 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2330 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2331 | } |
2332 | ||
9b646972 | 2333 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2334 | { |
3bc303c2 | 2335 | cifsFileInfo_put(cfile); |
d7c86ff8 | 2336 | cifs_sb_deactive(cfile->dentry->d_sb); |
3bc303c2 JL |
2337 | } |
2338 | ||
f5e54d6e | 2339 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2340 | .readpage = cifs_readpage, |
2341 | .readpages = cifs_readpages, | |
2342 | .writepage = cifs_writepage, | |
37c0eb46 | 2343 | .writepages = cifs_writepages, |
d9414774 NP |
2344 | .write_begin = cifs_write_begin, |
2345 | .write_end = cifs_write_end, | |
1da177e4 | 2346 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2347 | .releasepage = cifs_release_page, |
2348 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2349 | /* .sync_page = cifs_sync_page, */ |
2350 | /* .direct_IO = */ | |
2351 | }; | |
273d81d6 DK |
2352 | |
2353 | /* | |
2354 | * cifs_readpages requires the server to support a buffer large enough to | |
2355 | * contain the header plus one complete page of data. Otherwise, we need | |
2356 | * to leave cifs_readpages out of the address space operations. | |
2357 | */ | |
f5e54d6e | 2358 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2359 | .readpage = cifs_readpage, |
2360 | .writepage = cifs_writepage, | |
2361 | .writepages = cifs_writepages, | |
d9414774 NP |
2362 | .write_begin = cifs_write_begin, |
2363 | .write_end = cifs_write_end, | |
273d81d6 | 2364 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2365 | .releasepage = cifs_release_page, |
2366 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2367 | /* .sync_page = cifs_sync_page, */ |
2368 | /* .direct_IO = */ | |
2369 | }; |