Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
5 | * | |
6 | * Copyright (C) International Business Machines Corp., 2002,2003 | |
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> | |
30 | #include <linux/smp_lock.h> | |
37c0eb46 | 31 | #include <linux/writeback.h> |
6f88cc2e | 32 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 33 | #include <linux/delay.h> |
1da177e4 LT |
34 | #include <asm/div64.h> |
35 | #include "cifsfs.h" | |
36 | #include "cifspdu.h" | |
37 | #include "cifsglob.h" | |
38 | #include "cifsproto.h" | |
39 | #include "cifs_unicode.h" | |
40 | #include "cifs_debug.h" | |
41 | #include "cifs_fs_sb.h" | |
42 | ||
43 | static inline struct cifsFileInfo *cifs_init_private( | |
44 | struct cifsFileInfo *private_data, struct inode *inode, | |
45 | struct file *file, __u16 netfid) | |
46 | { | |
47 | memset(private_data, 0, sizeof(struct cifsFileInfo)); | |
48 | private_data->netfid = netfid; | |
49 | private_data->pid = current->tgid; | |
50 | init_MUTEX(&private_data->fh_sem); | |
7ee1af76 JA |
51 | init_MUTEX(&private_data->lock_sem); |
52 | INIT_LIST_HEAD(&private_data->llist); | |
1da177e4 LT |
53 | private_data->pfile = file; /* needed for writepage */ |
54 | private_data->pInode = inode; | |
55 | private_data->invalidHandle = FALSE; | |
56 | private_data->closePend = FALSE; | |
23e7dd7d SF |
57 | /* we have to track num writers to the inode, since writepages |
58 | does not tell us which handle the write is for so there can | |
59 | be a close (overlapping with write) of the filehandle that | |
60 | cifs_writepages chose to use */ | |
61 | atomic_set(&private_data->wrtPending,0); | |
1da177e4 LT |
62 | |
63 | return private_data; | |
64 | } | |
65 | ||
66 | static inline int cifs_convert_flags(unsigned int flags) | |
67 | { | |
68 | if ((flags & O_ACCMODE) == O_RDONLY) | |
69 | return GENERIC_READ; | |
70 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
71 | return GENERIC_WRITE; | |
72 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
73 | /* GENERIC_ALL is too much permission to request | |
74 | can cause unnecessary access denied on create */ | |
75 | /* return GENERIC_ALL; */ | |
76 | return (GENERIC_READ | GENERIC_WRITE); | |
77 | } | |
78 | ||
79 | return 0x20197; | |
80 | } | |
81 | ||
82 | static inline int cifs_get_disposition(unsigned int flags) | |
83 | { | |
84 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
85 | return FILE_CREATE; | |
86 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
87 | return FILE_OVERWRITE_IF; | |
88 | else if ((flags & O_CREAT) == O_CREAT) | |
89 | return FILE_OPEN_IF; | |
55aa2e09 SF |
90 | else if ((flags & O_TRUNC) == O_TRUNC) |
91 | return FILE_OVERWRITE; | |
1da177e4 LT |
92 | else |
93 | return FILE_OPEN; | |
94 | } | |
95 | ||
96 | /* all arguments to this function must be checked for validity in caller */ | |
97 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
98 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
99 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
100 | char *full_path, int xid) | |
101 | { | |
102 | struct timespec temp; | |
103 | int rc; | |
104 | ||
105 | /* want handles we can use to read with first | |
106 | in the list so we do not have to walk the | |
107 | list to search for one in prepare_write */ | |
108 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
109 | list_add_tail(&pCifsFile->flist, | |
110 | &pCifsInode->openFileList); | |
111 | } else { | |
112 | list_add(&pCifsFile->flist, | |
113 | &pCifsInode->openFileList); | |
114 | } | |
115 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
116 | if (pCifsInode->clientCanCacheRead) { |
117 | /* we have the inode open somewhere else | |
118 | no need to discard cache data */ | |
119 | goto client_can_cache; | |
120 | } | |
121 | ||
122 | /* BB need same check in cifs_create too? */ | |
123 | /* if not oplocked, invalidate inode pages if mtime or file | |
124 | size changed */ | |
125 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
126 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
127 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
128 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
129 | cFYI(1, ("inode unchanged on server")); | |
130 | } else { | |
e6a00296 | 131 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
132 | /* BB no need to lock inode until after invalidate |
133 | since namei code should already have it locked? */ | |
e6a00296 | 134 | filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
1da177e4 LT |
135 | } |
136 | cFYI(1, ("invalidating remote inode since open detected it " | |
137 | "changed")); | |
e6a00296 | 138 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
139 | } |
140 | ||
141 | client_can_cache: | |
142 | if (pTcon->ses->capabilities & CAP_UNIX) | |
e6a00296 | 143 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
144 | full_path, inode->i_sb, xid); |
145 | else | |
e6a00296 | 146 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
1da177e4 LT |
147 | full_path, buf, inode->i_sb, xid); |
148 | ||
149 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
150 | pCifsInode->clientCanCacheAll = TRUE; | |
151 | pCifsInode->clientCanCacheRead = TRUE; | |
152 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
e6a00296 | 153 | file->f_path.dentry->d_inode)); |
1da177e4 LT |
154 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
155 | pCifsInode->clientCanCacheRead = TRUE; | |
156 | ||
157 | return rc; | |
158 | } | |
159 | ||
160 | int cifs_open(struct inode *inode, struct file *file) | |
161 | { | |
162 | int rc = -EACCES; | |
163 | int xid, oplock; | |
164 | struct cifs_sb_info *cifs_sb; | |
165 | struct cifsTconInfo *pTcon; | |
166 | struct cifsFileInfo *pCifsFile; | |
167 | struct cifsInodeInfo *pCifsInode; | |
168 | struct list_head *tmp; | |
169 | char *full_path = NULL; | |
170 | int desiredAccess; | |
171 | int disposition; | |
172 | __u16 netfid; | |
173 | FILE_ALL_INFO *buf = NULL; | |
174 | ||
175 | xid = GetXid(); | |
176 | ||
177 | cifs_sb = CIFS_SB(inode->i_sb); | |
178 | pTcon = cifs_sb->tcon; | |
179 | ||
180 | if (file->f_flags & O_CREAT) { | |
181 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 182 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
183 | read_lock(&GlobalSMBSeslock); |
184 | list_for_each(tmp, &pCifsInode->openFileList) { | |
185 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
186 | flist); | |
187 | if ((pCifsFile->pfile == NULL) && | |
188 | (pCifsFile->pid == current->tgid)) { | |
189 | /* mode set in cifs_create */ | |
190 | ||
191 | /* needed for writepage */ | |
192 | pCifsFile->pfile = file; | |
193 | ||
194 | file->private_data = pCifsFile; | |
195 | break; | |
196 | } | |
197 | } | |
198 | read_unlock(&GlobalSMBSeslock); | |
199 | if (file->private_data != NULL) { | |
200 | rc = 0; | |
201 | FreeXid(xid); | |
202 | return rc; | |
203 | } else { | |
204 | if (file->f_flags & O_EXCL) | |
205 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 206 | "new file %p", file)); |
1da177e4 LT |
207 | } |
208 | } | |
209 | ||
e6a00296 | 210 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
211 | if (full_path == NULL) { |
212 | FreeXid(xid); | |
213 | return -ENOMEM; | |
214 | } | |
215 | ||
216 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
217 | inode, file->f_flags, full_path)); | |
218 | desiredAccess = cifs_convert_flags(file->f_flags); | |
219 | ||
220 | /********************************************************************* | |
221 | * open flag mapping table: | |
222 | * | |
223 | * POSIX Flag CIFS Disposition | |
224 | * ---------- ---------------- | |
225 | * O_CREAT FILE_OPEN_IF | |
226 | * O_CREAT | O_EXCL FILE_CREATE | |
227 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
228 | * O_TRUNC FILE_OVERWRITE | |
229 | * none of the above FILE_OPEN | |
230 | * | |
231 | * Note that there is not a direct match between disposition | |
232 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
233 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
234 | * file rather than creating a new file as FILE_SUPERSEDE does | |
235 | * (which uses the attributes / metadata passed in on open call) | |
236 | *? | |
237 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
238 | *? and the read write flags match reasonably. O_LARGEFILE | |
239 | *? is irrelevant because largefile support is always used | |
240 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
241 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
242 | *********************************************************************/ | |
243 | ||
244 | disposition = cifs_get_disposition(file->f_flags); | |
245 | ||
246 | if (oplockEnabled) | |
247 | oplock = REQ_OPLOCK; | |
248 | else | |
249 | oplock = FALSE; | |
250 | ||
251 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
252 | ||
253 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
254 | and calling get_inode_info with returned buf (at least helps | |
255 | non-Unix server case) */ | |
256 | ||
257 | /* BB we can not do this if this is the second open of a file | |
258 | and the first handle has writebehind data, we might be | |
259 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ | |
260 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
261 | if (!buf) { | |
262 | rc = -ENOMEM; | |
263 | goto out; | |
264 | } | |
5bafd765 SF |
265 | |
266 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
267 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, | |
268 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
737b758c SF |
269 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
270 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
271 | else |
272 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
273 | ||
a9d02ad4 SF |
274 | if (rc == -EIO) { |
275 | /* Old server, try legacy style OpenX */ | |
276 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
277 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
278 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
279 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
280 | } | |
1da177e4 | 281 | if (rc) { |
26a21b98 | 282 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
283 | goto out; |
284 | } | |
285 | file->private_data = | |
286 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
287 | if (file->private_data == NULL) { | |
288 | rc = -ENOMEM; | |
289 | goto out; | |
290 | } | |
291 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 LT |
292 | write_lock(&GlobalSMBSeslock); |
293 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
294 | ||
e6a00296 | 295 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
296 | if (pCifsInode) { |
297 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
298 | pCifsFile, pTcon, | |
299 | &oplock, buf, full_path, xid); | |
300 | } else { | |
301 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
302 | } |
303 | ||
304 | if (oplock & CIFS_CREATE_ACTION) { | |
305 | /* time to set mode which we can not set earlier due to | |
306 | problems creating new read-only files */ | |
307 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) { | |
308 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, | |
309 | inode->i_mode, | |
310 | (__u64)-1, (__u64)-1, 0 /* dev */, | |
737b758c SF |
311 | cifs_sb->local_nls, |
312 | cifs_sb->mnt_cifs_flags & | |
313 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
314 | } else { |
315 | /* BB implement via Windows security descriptors eg | |
316 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, | |
317 | -1, -1, local_nls); | |
318 | in the meantime could set r/o dos attribute when | |
319 | perms are eg: mode & 0222 == 0 */ | |
320 | } | |
321 | } | |
322 | ||
323 | out: | |
324 | kfree(buf); | |
325 | kfree(full_path); | |
326 | FreeXid(xid); | |
327 | return rc; | |
328 | } | |
329 | ||
0418726b | 330 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
331 | /* to server was lost */ |
332 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
333 | { | |
334 | int rc = 0; | |
335 | ||
336 | /* BB list all locks open on this file and relock */ | |
337 | ||
338 | return rc; | |
339 | } | |
340 | ||
341 | static int cifs_reopen_file(struct inode *inode, struct file *file, | |
342 | int can_flush) | |
343 | { | |
344 | int rc = -EACCES; | |
345 | int xid, oplock; | |
346 | struct cifs_sb_info *cifs_sb; | |
347 | struct cifsTconInfo *pTcon; | |
348 | struct cifsFileInfo *pCifsFile; | |
349 | struct cifsInodeInfo *pCifsInode; | |
350 | char *full_path = NULL; | |
351 | int desiredAccess; | |
352 | int disposition = FILE_OPEN; | |
353 | __u16 netfid; | |
354 | ||
355 | if (inode == NULL) | |
356 | return -EBADF; | |
357 | if (file->private_data) { | |
358 | pCifsFile = (struct cifsFileInfo *)file->private_data; | |
359 | } else | |
360 | return -EBADF; | |
361 | ||
362 | xid = GetXid(); | |
363 | down(&pCifsFile->fh_sem); | |
364 | if (pCifsFile->invalidHandle == FALSE) { | |
365 | up(&pCifsFile->fh_sem); | |
366 | FreeXid(xid); | |
367 | return 0; | |
368 | } | |
369 | ||
e6a00296 | 370 | if (file->f_path.dentry == NULL) { |
1da177e4 LT |
371 | up(&pCifsFile->fh_sem); |
372 | cFYI(1, ("failed file reopen, no valid name if dentry freed")); | |
373 | FreeXid(xid); | |
374 | return -EBADF; | |
375 | } | |
376 | cifs_sb = CIFS_SB(inode->i_sb); | |
377 | pTcon = cifs_sb->tcon; | |
378 | /* can not grab rename sem here because various ops, including | |
379 | those that already have the rename sem can end up causing writepage | |
380 | to get called and if the server was down that means we end up here, | |
381 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 382 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
383 | if (full_path == NULL) { |
384 | up(&pCifsFile->fh_sem); | |
385 | FreeXid(xid); | |
386 | return -ENOMEM; | |
387 | } | |
388 | ||
389 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
390 | inode, file->f_flags,full_path)); | |
391 | desiredAccess = cifs_convert_flags(file->f_flags); | |
392 | ||
393 | if (oplockEnabled) | |
394 | oplock = REQ_OPLOCK; | |
395 | else | |
396 | oplock = FALSE; | |
397 | ||
398 | /* Can not refresh inode by passing in file_info buf to be returned | |
399 | by SMBOpen and then calling get_inode_info with returned buf | |
400 | since file might have write behind data that needs to be flushed | |
401 | and server version of file size can be stale. If we knew for sure | |
402 | that inode was not dirty locally we could do this */ | |
403 | ||
404 | /* buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
405 | if (buf == 0) { | |
406 | up(&pCifsFile->fh_sem); | |
407 | kfree(full_path); | |
408 | FreeXid(xid); | |
409 | return -ENOMEM; | |
410 | } */ | |
411 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, | |
412 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
737b758c SF |
413 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
414 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
415 | if (rc) { |
416 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
417 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
418 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 LT |
419 | } else { |
420 | pCifsFile->netfid = netfid; | |
421 | pCifsFile->invalidHandle = FALSE; | |
422 | up(&pCifsFile->fh_sem); | |
423 | pCifsInode = CIFS_I(inode); | |
424 | if (pCifsInode) { | |
425 | if (can_flush) { | |
28fd1298 | 426 | filemap_write_and_wait(inode->i_mapping); |
1da177e4 LT |
427 | /* temporarily disable caching while we |
428 | go to server to get inode info */ | |
429 | pCifsInode->clientCanCacheAll = FALSE; | |
430 | pCifsInode->clientCanCacheRead = FALSE; | |
431 | if (pTcon->ses->capabilities & CAP_UNIX) | |
432 | rc = cifs_get_inode_info_unix(&inode, | |
433 | full_path, inode->i_sb, xid); | |
434 | else | |
435 | rc = cifs_get_inode_info(&inode, | |
436 | full_path, NULL, inode->i_sb, | |
437 | xid); | |
438 | } /* else we are writing out data to server already | |
439 | and could deadlock if we tried to flush data, and | |
440 | since we do not know if we have data that would | |
441 | invalidate the current end of file on the server | |
442 | we can not go to the server to get the new inod | |
443 | info */ | |
444 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
445 | pCifsInode->clientCanCacheAll = TRUE; | |
446 | pCifsInode->clientCanCacheRead = TRUE; | |
447 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
e6a00296 | 448 | file->f_path.dentry->d_inode)); |
1da177e4 LT |
449 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
450 | pCifsInode->clientCanCacheRead = TRUE; | |
451 | pCifsInode->clientCanCacheAll = FALSE; | |
452 | } else { | |
453 | pCifsInode->clientCanCacheRead = FALSE; | |
454 | pCifsInode->clientCanCacheAll = FALSE; | |
455 | } | |
456 | cifs_relock_file(pCifsFile); | |
457 | } | |
458 | } | |
459 | ||
460 | kfree(full_path); | |
461 | FreeXid(xid); | |
462 | return rc; | |
463 | } | |
464 | ||
465 | int cifs_close(struct inode *inode, struct file *file) | |
466 | { | |
467 | int rc = 0; | |
468 | int xid; | |
469 | struct cifs_sb_info *cifs_sb; | |
470 | struct cifsTconInfo *pTcon; | |
471 | struct cifsFileInfo *pSMBFile = | |
472 | (struct cifsFileInfo *)file->private_data; | |
473 | ||
474 | xid = GetXid(); | |
475 | ||
476 | cifs_sb = CIFS_SB(inode->i_sb); | |
477 | pTcon = cifs_sb->tcon; | |
478 | if (pSMBFile) { | |
7ee1af76 JA |
479 | struct cifsLockInfo *li, *tmp; |
480 | ||
1da177e4 | 481 | pSMBFile->closePend = TRUE; |
1da177e4 LT |
482 | if (pTcon) { |
483 | /* no sense reconnecting to close a file that is | |
484 | already closed */ | |
485 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
23e7dd7d SF |
486 | int timeout = 2; |
487 | while((atomic_read(&pSMBFile->wrtPending) != 0) | |
488 | && (timeout < 1000) ) { | |
489 | /* Give write a better chance to get to | |
490 | server ahead of the close. We do not | |
491 | want to add a wait_q here as it would | |
492 | increase the memory utilization as | |
493 | the struct would be in each open file, | |
494 | but this should give enough time to | |
495 | clear the socket */ | |
4891d539 SF |
496 | #ifdef CONFIG_CIFS_DEBUG2 |
497 | cFYI(1,("close delay, write pending")); | |
498 | #endif /* DEBUG2 */ | |
23e7dd7d SF |
499 | msleep(timeout); |
500 | timeout *= 4; | |
4891d539 | 501 | } |
f7b2e8c7 SF |
502 | if(atomic_read(&pSMBFile->wrtPending)) |
503 | cERROR(1,("close with pending writes")); | |
1da177e4 LT |
504 | rc = CIFSSMBClose(xid, pTcon, |
505 | pSMBFile->netfid); | |
1da177e4 LT |
506 | } |
507 | } | |
7ee1af76 JA |
508 | |
509 | /* Delete any outstanding lock records. | |
510 | We'll lose them when the file is closed anyway. */ | |
511 | down(&pSMBFile->lock_sem); | |
512 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { | |
513 | list_del(&li->llist); | |
514 | kfree(li); | |
515 | } | |
516 | up(&pSMBFile->lock_sem); | |
517 | ||
cbe0476f | 518 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
519 | list_del(&pSMBFile->flist); |
520 | list_del(&pSMBFile->tlist); | |
cbe0476f | 521 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
522 | kfree(pSMBFile->search_resume_name); |
523 | kfree(file->private_data); | |
524 | file->private_data = NULL; | |
525 | } else | |
526 | rc = -EBADF; | |
527 | ||
528 | if (list_empty(&(CIFS_I(inode)->openFileList))) { | |
529 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
530 | /* if the file is not open we do not know if we can cache info | |
531 | on this inode, much less write behind and read ahead */ | |
532 | CIFS_I(inode)->clientCanCacheRead = FALSE; | |
533 | CIFS_I(inode)->clientCanCacheAll = FALSE; | |
534 | } | |
535 | if ((rc ==0) && CIFS_I(inode)->write_behind_rc) | |
536 | rc = CIFS_I(inode)->write_behind_rc; | |
537 | FreeXid(xid); | |
538 | return rc; | |
539 | } | |
540 | ||
541 | int cifs_closedir(struct inode *inode, struct file *file) | |
542 | { | |
543 | int rc = 0; | |
544 | int xid; | |
545 | struct cifsFileInfo *pCFileStruct = | |
546 | (struct cifsFileInfo *)file->private_data; | |
547 | char *ptmp; | |
548 | ||
26a21b98 | 549 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
550 | |
551 | xid = GetXid(); | |
552 | ||
553 | if (pCFileStruct) { | |
554 | struct cifsTconInfo *pTcon; | |
e6a00296 | 555 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
556 | |
557 | pTcon = cifs_sb->tcon; | |
558 | ||
559 | cFYI(1, ("Freeing private data in close dir")); | |
31ca3bc3 SF |
560 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
561 | (pCFileStruct->invalidHandle == FALSE)) { | |
1da177e4 LT |
562 | pCFileStruct->invalidHandle = TRUE; |
563 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
564 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
565 | rc)); | |
566 | /* not much we can do if it fails anyway, ignore rc */ | |
567 | rc = 0; | |
568 | } | |
569 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
570 | if (ptmp) { | |
ec637e3f | 571 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 572 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
d47d7c1a SF |
573 | if(pCFileStruct->srch_inf.smallBuf) |
574 | cifs_small_buf_release(ptmp); | |
575 | else | |
576 | cifs_buf_release(ptmp); | |
1da177e4 LT |
577 | } |
578 | ptmp = pCFileStruct->search_resume_name; | |
579 | if (ptmp) { | |
ec637e3f | 580 | cFYI(1, ("closedir free resume name")); |
1da177e4 LT |
581 | pCFileStruct->search_resume_name = NULL; |
582 | kfree(ptmp); | |
583 | } | |
584 | kfree(file->private_data); | |
585 | file->private_data = NULL; | |
586 | } | |
587 | /* BB can we lock the filestruct while this is going on? */ | |
588 | FreeXid(xid); | |
589 | return rc; | |
590 | } | |
591 | ||
7ee1af76 JA |
592 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
593 | __u64 offset, __u8 lockType) | |
594 | { | |
595 | struct cifsLockInfo *li = kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
596 | if (li == NULL) | |
597 | return -ENOMEM; | |
598 | li->offset = offset; | |
599 | li->length = len; | |
600 | li->type = lockType; | |
601 | down(&fid->lock_sem); | |
602 | list_add(&li->llist, &fid->llist); | |
603 | up(&fid->lock_sem); | |
604 | return 0; | |
605 | } | |
606 | ||
1da177e4 LT |
607 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
608 | { | |
609 | int rc, xid; | |
1da177e4 LT |
610 | __u32 numLock = 0; |
611 | __u32 numUnlock = 0; | |
612 | __u64 length; | |
613 | int wait_flag = FALSE; | |
614 | struct cifs_sb_info *cifs_sb; | |
615 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
616 | __u16 netfid; |
617 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
7ee1af76 | 618 | int posix_locking; |
1da177e4 LT |
619 | |
620 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
621 | rc = -EACCES; | |
622 | xid = GetXid(); | |
623 | ||
624 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
625 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
626 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, | |
627 | pfLock->fl_end)); | |
628 | ||
629 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 630 | cFYI(1, ("Posix")); |
1da177e4 | 631 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 632 | cFYI(1, ("Flock")); |
1da177e4 | 633 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 634 | cFYI(1, ("Blocking lock")); |
1da177e4 LT |
635 | wait_flag = TRUE; |
636 | } | |
637 | if (pfLock->fl_flags & FL_ACCESS) | |
638 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 639 | "not implemented yet")); |
1da177e4 LT |
640 | if (pfLock->fl_flags & FL_LEASE) |
641 | cFYI(1, ("Lease on file - not implemented yet")); | |
642 | if (pfLock->fl_flags & | |
643 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) | |
644 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
645 | ||
646 | if (pfLock->fl_type == F_WRLCK) { | |
647 | cFYI(1, ("F_WRLCK ")); | |
648 | numLock = 1; | |
649 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 650 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 651 | numUnlock = 1; |
d47d7c1a SF |
652 | /* Check if unlock includes more than |
653 | one lock range */ | |
1da177e4 | 654 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 655 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
656 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
657 | numLock = 1; | |
658 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 659 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
660 | numLock = 1; |
661 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 662 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
663 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
664 | numLock = 1; | |
665 | } else | |
d47d7c1a | 666 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 667 | |
e6a00296 | 668 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
669 | pTcon = cifs_sb->tcon; |
670 | ||
671 | if (file->private_data == NULL) { | |
672 | FreeXid(xid); | |
673 | return -EBADF; | |
674 | } | |
08547b03 SF |
675 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
676 | ||
7ee1af76 JA |
677 | posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
678 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability)); | |
1da177e4 | 679 | |
08547b03 SF |
680 | /* BB add code here to normalize offset and length to |
681 | account for negative length which we can not accept over the | |
682 | wire */ | |
1da177e4 | 683 | if (IS_GETLK(cmd)) { |
7ee1af76 | 684 | if(posix_locking) { |
08547b03 SF |
685 | int posix_lock_type; |
686 | if(lockType & LOCKING_ANDX_SHARED_LOCK) | |
687 | posix_lock_type = CIFS_RDLCK; | |
688 | else | |
689 | posix_lock_type = CIFS_WRLCK; | |
690 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, | |
fc94cdb9 | 691 | length, pfLock, |
08547b03 SF |
692 | posix_lock_type, wait_flag); |
693 | FreeXid(xid); | |
694 | return rc; | |
695 | } | |
696 | ||
697 | /* BB we could chain these into one lock request BB */ | |
698 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
699 | 0, 1, lockType, 0 /* wait flag */ ); | |
1da177e4 | 700 | if (rc == 0) { |
08547b03 | 701 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
1da177e4 LT |
702 | pfLock->fl_start, 1 /* numUnlock */ , |
703 | 0 /* numLock */ , lockType, | |
704 | 0 /* wait flag */ ); | |
705 | pfLock->fl_type = F_UNLCK; | |
706 | if (rc != 0) | |
707 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 708 | "range %d during test of lock", rc)); |
1da177e4 LT |
709 | rc = 0; |
710 | ||
711 | } else { | |
712 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
713 | rc = 0; /* do not change lock type to unlock | |
714 | since range in use */ | |
715 | } | |
716 | ||
717 | FreeXid(xid); | |
718 | return rc; | |
719 | } | |
7ee1af76 JA |
720 | |
721 | if (!numLock && !numUnlock) { | |
722 | /* if no lock or unlock then nothing | |
723 | to do since we do not know what it is */ | |
724 | FreeXid(xid); | |
725 | return -EOPNOTSUPP; | |
726 | } | |
727 | ||
728 | if (posix_locking) { | |
08547b03 SF |
729 | int posix_lock_type; |
730 | if(lockType & LOCKING_ANDX_SHARED_LOCK) | |
731 | posix_lock_type = CIFS_RDLCK; | |
732 | else | |
733 | posix_lock_type = CIFS_WRLCK; | |
734 | ||
735 | if(numUnlock == 1) | |
beb84dc8 | 736 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 737 | |
08547b03 | 738 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, |
fc94cdb9 | 739 | length, pfLock, |
08547b03 | 740 | posix_lock_type, wait_flag); |
7ee1af76 JA |
741 | } else { |
742 | struct cifsFileInfo *fid = (struct cifsFileInfo *)file->private_data; | |
743 | ||
744 | if (numLock) { | |
745 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
746 | 0, numLock, lockType, wait_flag); | |
747 | ||
748 | if (rc == 0) { | |
749 | /* For Windows locks we must store them. */ | |
750 | rc = store_file_lock(fid, length, | |
751 | pfLock->fl_start, lockType); | |
752 | } | |
753 | } else if (numUnlock) { | |
754 | /* For each stored lock that this unlock overlaps | |
755 | completely, unlock it. */ | |
756 | int stored_rc = 0; | |
757 | struct cifsLockInfo *li, *tmp; | |
758 | ||
6b70c955 | 759 | rc = 0; |
7ee1af76 JA |
760 | down(&fid->lock_sem); |
761 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { | |
762 | if (pfLock->fl_start <= li->offset && | |
763 | length >= li->length) { | |
764 | stored_rc = CIFSSMBLock(xid, pTcon, netfid, | |
765 | li->length, li->offset, | |
766 | 1, 0, li->type, FALSE); | |
767 | if (stored_rc) | |
768 | rc = stored_rc; | |
769 | ||
770 | list_del(&li->llist); | |
771 | kfree(li); | |
772 | } | |
773 | } | |
6b70c955 | 774 | up(&fid->lock_sem); |
7ee1af76 JA |
775 | } |
776 | } | |
777 | ||
d634cc15 | 778 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
779 | posix_lock_file_wait(file, pfLock); |
780 | FreeXid(xid); | |
781 | return rc; | |
782 | } | |
783 | ||
784 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
785 | size_t write_size, loff_t *poffset) | |
786 | { | |
787 | int rc = 0; | |
788 | unsigned int bytes_written = 0; | |
789 | unsigned int total_written; | |
790 | struct cifs_sb_info *cifs_sb; | |
791 | struct cifsTconInfo *pTcon; | |
792 | int xid, long_op; | |
793 | struct cifsFileInfo *open_file; | |
794 | ||
e6a00296 | 795 | if (file->f_path.dentry == NULL) |
1da177e4 LT |
796 | return -EBADF; |
797 | ||
e6a00296 | 798 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
799 | if (cifs_sb == NULL) |
800 | return -EBADF; | |
801 | ||
802 | pTcon = cifs_sb->tcon; | |
803 | ||
804 | /* cFYI(1, | |
805 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 806 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
807 | |
808 | if (file->private_data == NULL) | |
809 | return -EBADF; | |
810 | else | |
811 | open_file = (struct cifsFileInfo *) file->private_data; | |
812 | ||
813 | xid = GetXid(); | |
e6a00296 | 814 | if (file->f_path.dentry->d_inode == NULL) { |
1da177e4 LT |
815 | FreeXid(xid); |
816 | return -EBADF; | |
817 | } | |
818 | ||
e6a00296 | 819 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
820 | long_op = 2; /* writes past end of file can take a long time */ |
821 | else | |
822 | long_op = 1; | |
823 | ||
824 | for (total_written = 0; write_size > total_written; | |
825 | total_written += bytes_written) { | |
826 | rc = -EAGAIN; | |
827 | while (rc == -EAGAIN) { | |
828 | if (file->private_data == NULL) { | |
829 | /* file has been closed on us */ | |
830 | FreeXid(xid); | |
831 | /* if we have gotten here we have written some data | |
832 | and blocked, and the file has been freed on us while | |
833 | we blocked so return what we managed to write */ | |
834 | return total_written; | |
835 | } | |
836 | if (open_file->closePend) { | |
837 | FreeXid(xid); | |
838 | if (total_written) | |
839 | return total_written; | |
840 | else | |
841 | return -EBADF; | |
842 | } | |
843 | if (open_file->invalidHandle) { | |
e6a00296 JJS |
844 | if ((file->f_path.dentry == NULL) || |
845 | (file->f_path.dentry->d_inode == NULL)) { | |
1da177e4 LT |
846 | FreeXid(xid); |
847 | return total_written; | |
848 | } | |
849 | /* we could deadlock if we called | |
850 | filemap_fdatawait from here so tell | |
851 | reopen_file not to flush data to server | |
852 | now */ | |
e6a00296 | 853 | rc = cifs_reopen_file(file->f_path.dentry->d_inode, |
1da177e4 LT |
854 | file, FALSE); |
855 | if (rc != 0) | |
856 | break; | |
857 | } | |
858 | ||
859 | rc = CIFSSMBWrite(xid, pTcon, | |
860 | open_file->netfid, | |
861 | min_t(const int, cifs_sb->wsize, | |
862 | write_size - total_written), | |
863 | *poffset, &bytes_written, | |
864 | NULL, write_data + total_written, long_op); | |
865 | } | |
866 | if (rc || (bytes_written == 0)) { | |
867 | if (total_written) | |
868 | break; | |
869 | else { | |
870 | FreeXid(xid); | |
871 | return rc; | |
872 | } | |
873 | } else | |
874 | *poffset += bytes_written; | |
875 | long_op = FALSE; /* subsequent writes fast - | |
876 | 15 seconds is plenty */ | |
877 | } | |
878 | ||
a4544347 | 879 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
880 | |
881 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
882 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
883 | struct inode *inode = file->f_path.dentry->d_inode; | |
884 | /* Do not update local mtime - server will set its actual value on write | |
885 | * inode->i_ctime = inode->i_mtime = | |
886 | * current_fs_time(inode->i_sb);*/ | |
887 | if (total_written > 0) { | |
888 | spin_lock(&inode->i_lock); | |
889 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
890 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 891 | *poffset); |
3677db10 | 892 | spin_unlock(&inode->i_lock); |
1da177e4 | 893 | } |
3677db10 | 894 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
895 | } |
896 | FreeXid(xid); | |
897 | return total_written; | |
898 | } | |
899 | ||
900 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
901 | size_t write_size, loff_t *poffset) | |
902 | { | |
903 | int rc = 0; | |
904 | unsigned int bytes_written = 0; | |
905 | unsigned int total_written; | |
906 | struct cifs_sb_info *cifs_sb; | |
907 | struct cifsTconInfo *pTcon; | |
908 | int xid, long_op; | |
909 | struct cifsFileInfo *open_file; | |
910 | ||
e6a00296 | 911 | if (file->f_path.dentry == NULL) |
1da177e4 LT |
912 | return -EBADF; |
913 | ||
e6a00296 | 914 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
915 | if (cifs_sb == NULL) |
916 | return -EBADF; | |
917 | ||
918 | pTcon = cifs_sb->tcon; | |
919 | ||
ab2f218f | 920 | cFYI(1,("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 921 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
922 | |
923 | if (file->private_data == NULL) | |
924 | return -EBADF; | |
925 | else | |
926 | open_file = (struct cifsFileInfo *)file->private_data; | |
927 | ||
928 | xid = GetXid(); | |
e6a00296 | 929 | if (file->f_path.dentry->d_inode == NULL) { |
1da177e4 LT |
930 | FreeXid(xid); |
931 | return -EBADF; | |
932 | } | |
933 | ||
e6a00296 | 934 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
935 | long_op = 2; /* writes past end of file can take a long time */ |
936 | else | |
937 | long_op = 1; | |
938 | ||
939 | for (total_written = 0; write_size > total_written; | |
940 | total_written += bytes_written) { | |
941 | rc = -EAGAIN; | |
942 | while (rc == -EAGAIN) { | |
943 | if (file->private_data == NULL) { | |
944 | /* file has been closed on us */ | |
945 | FreeXid(xid); | |
946 | /* if we have gotten here we have written some data | |
947 | and blocked, and the file has been freed on us | |
948 | while we blocked so return what we managed to | |
949 | write */ | |
950 | return total_written; | |
951 | } | |
952 | if (open_file->closePend) { | |
953 | FreeXid(xid); | |
954 | if (total_written) | |
955 | return total_written; | |
956 | else | |
957 | return -EBADF; | |
958 | } | |
959 | if (open_file->invalidHandle) { | |
e6a00296 JJS |
960 | if ((file->f_path.dentry == NULL) || |
961 | (file->f_path.dentry->d_inode == NULL)) { | |
1da177e4 LT |
962 | FreeXid(xid); |
963 | return total_written; | |
964 | } | |
965 | /* we could deadlock if we called | |
966 | filemap_fdatawait from here so tell | |
967 | reopen_file not to flush data to | |
968 | server now */ | |
e6a00296 | 969 | rc = cifs_reopen_file(file->f_path.dentry->d_inode, |
1da177e4 LT |
970 | file, FALSE); |
971 | if (rc != 0) | |
972 | break; | |
973 | } | |
c01f36a8 | 974 | if(experimEnabled || (pTcon->ses->server && |
08775834 SF |
975 | ((pTcon->ses->server->secMode & |
976 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
c01f36a8 | 977 | == 0))) { |
3e84469d SF |
978 | struct kvec iov[2]; |
979 | unsigned int len; | |
980 | ||
0ae0efad | 981 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
982 | write_size - total_written); |
983 | /* iov[0] is reserved for smb header */ | |
984 | iov[1].iov_base = (char *)write_data + | |
985 | total_written; | |
986 | iov[1].iov_len = len; | |
d6e04ae6 | 987 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 988 | open_file->netfid, len, |
d6e04ae6 | 989 | *poffset, &bytes_written, |
3e84469d | 990 | iov, 1, long_op); |
d6e04ae6 | 991 | } else |
60808233 SF |
992 | rc = CIFSSMBWrite(xid, pTcon, |
993 | open_file->netfid, | |
994 | min_t(const int, cifs_sb->wsize, | |
995 | write_size - total_written), | |
996 | *poffset, &bytes_written, | |
997 | write_data + total_written, | |
998 | NULL, long_op); | |
1da177e4 LT |
999 | } |
1000 | if (rc || (bytes_written == 0)) { | |
1001 | if (total_written) | |
1002 | break; | |
1003 | else { | |
1004 | FreeXid(xid); | |
1005 | return rc; | |
1006 | } | |
1007 | } else | |
1008 | *poffset += bytes_written; | |
1009 | long_op = FALSE; /* subsequent writes fast - | |
1010 | 15 seconds is plenty */ | |
1011 | } | |
1012 | ||
a4544347 | 1013 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1014 | |
1015 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1016 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1017 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1018 | /* file->f_path.dentry->d_inode->i_ctime = |
1019 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1020 | if (total_written > 0) { | |
1021 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1022 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1023 | i_size_write(file->f_path.dentry->d_inode, | |
1024 | *poffset); | |
1025 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1026 | } |
3677db10 | 1027 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1028 | } |
1029 | FreeXid(xid); | |
1030 | return total_written; | |
1031 | } | |
1032 | ||
dd99cd80 | 1033 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1034 | { |
1035 | struct cifsFileInfo *open_file; | |
dd99cd80 | 1036 | int rc; |
6148a742 | 1037 | |
60808233 SF |
1038 | /* Having a null inode here (because mapping->host was set to zero by |
1039 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1040 | it being zero) during stress testcases so we need to check for it */ | |
1041 | ||
1042 | if(cifs_inode == NULL) { | |
1043 | cERROR(1,("Null inode passed to cifs_writeable_file")); | |
1044 | dump_stack(); | |
1045 | return NULL; | |
1046 | } | |
1047 | ||
6148a742 SF |
1048 | read_lock(&GlobalSMBSeslock); |
1049 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1050 | if (open_file->closePend) | |
1051 | continue; | |
1052 | if (open_file->pfile && | |
1053 | ((open_file->pfile->f_flags & O_RDWR) || | |
1054 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1055 | atomic_inc(&open_file->wrtPending); |
6148a742 | 1056 | read_unlock(&GlobalSMBSeslock); |
0ae0efad | 1057 | if((open_file->invalidHandle) && |
23e7dd7d | 1058 | (!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) { |
dd99cd80 | 1059 | rc = cifs_reopen_file(&cifs_inode->vfs_inode, |
37c0eb46 SF |
1060 | open_file->pfile, FALSE); |
1061 | /* if it fails, try another handle - might be */ | |
1062 | /* dangerous to hold up writepages with retry */ | |
1063 | if(rc) { | |
4a77118c | 1064 | cFYI(1,("failed on reopen file in wp")); |
37c0eb46 | 1065 | read_lock(&GlobalSMBSeslock); |
23e7dd7d SF |
1066 | /* can not use this handle, no write |
1067 | pending on this one after all */ | |
1068 | atomic_dec | |
1069 | (&open_file->wrtPending); | |
37c0eb46 SF |
1070 | continue; |
1071 | } | |
1072 | } | |
6148a742 SF |
1073 | return open_file; |
1074 | } | |
1075 | } | |
1076 | read_unlock(&GlobalSMBSeslock); | |
1077 | return NULL; | |
1078 | } | |
1079 | ||
1da177e4 LT |
1080 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1081 | { | |
1082 | struct address_space *mapping = page->mapping; | |
1083 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1084 | char *write_data; | |
1085 | int rc = -EFAULT; | |
1086 | int bytes_written = 0; | |
1087 | struct cifs_sb_info *cifs_sb; | |
1088 | struct cifsTconInfo *pTcon; | |
1089 | struct inode *inode; | |
6148a742 | 1090 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1091 | |
1092 | if (!mapping || !mapping->host) | |
1093 | return -EFAULT; | |
1094 | ||
1095 | inode = page->mapping->host; | |
1096 | cifs_sb = CIFS_SB(inode->i_sb); | |
1097 | pTcon = cifs_sb->tcon; | |
1098 | ||
1099 | offset += (loff_t)from; | |
1100 | write_data = kmap(page); | |
1101 | write_data += from; | |
1102 | ||
1103 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1104 | kunmap(page); | |
1105 | return -EIO; | |
1106 | } | |
1107 | ||
1108 | /* racing with truncate? */ | |
1109 | if (offset > mapping->host->i_size) { | |
1110 | kunmap(page); | |
1111 | return 0; /* don't care */ | |
1112 | } | |
1113 | ||
1114 | /* check to make sure that we are not extending the file */ | |
1115 | if (mapping->host->i_size - offset < (loff_t)to) | |
1116 | to = (unsigned)(mapping->host->i_size - offset); | |
1117 | ||
6148a742 SF |
1118 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1119 | if (open_file) { | |
1120 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1121 | to-from, &offset); | |
23e7dd7d | 1122 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1123 | /* Does mm or vfs already set times? */ |
6148a742 SF |
1124 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
1125 | if ((bytes_written > 0) && (offset)) { | |
1126 | rc = 0; | |
1127 | } else if (bytes_written < 0) { | |
1128 | if (rc != -EBADF) | |
1129 | rc = bytes_written; | |
1da177e4 | 1130 | } |
6148a742 | 1131 | } else { |
1da177e4 LT |
1132 | cFYI(1, ("No writeable filehandles for inode")); |
1133 | rc = -EIO; | |
1134 | } | |
1135 | ||
1136 | kunmap(page); | |
1137 | return rc; | |
1138 | } | |
1139 | ||
1da177e4 | 1140 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1141 | struct writeback_control *wbc) |
1da177e4 | 1142 | { |
37c0eb46 SF |
1143 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1144 | unsigned int bytes_to_write; | |
1145 | unsigned int bytes_written; | |
1146 | struct cifs_sb_info *cifs_sb; | |
1147 | int done = 0; | |
111ebb6e | 1148 | pgoff_t end; |
37c0eb46 | 1149 | pgoff_t index; |
111ebb6e | 1150 | int range_whole = 0; |
9a0c8230 | 1151 | struct kvec * iov; |
84d2f07e | 1152 | int len; |
37c0eb46 SF |
1153 | int n_iov = 0; |
1154 | pgoff_t next; | |
1155 | int nr_pages; | |
1156 | __u64 offset = 0; | |
23e7dd7d | 1157 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1158 | struct page *page; |
1159 | struct pagevec pvec; | |
1160 | int rc = 0; | |
1161 | int scanned = 0; | |
1da177e4 LT |
1162 | int xid; |
1163 | ||
37c0eb46 SF |
1164 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
1165 | ||
1166 | /* | |
1167 | * If wsize is smaller that the page cache size, default to writing | |
1168 | * one page at a time via cifs_writepage | |
1169 | */ | |
1170 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1171 | return generic_writepages(mapping, wbc); | |
1172 | ||
4a77118c SF |
1173 | if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1174 | if(cifs_sb->tcon->ses->server->secMode & | |
1175 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
9a0c8230 | 1176 | if(!experimEnabled) |
60808233 | 1177 | return generic_writepages(mapping, wbc); |
4a77118c | 1178 | |
9a0c8230 SF |
1179 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
1180 | if(iov == NULL) | |
1181 | return generic_writepages(mapping, wbc); | |
1182 | ||
1183 | ||
37c0eb46 SF |
1184 | /* |
1185 | * BB: Is this meaningful for a non-block-device file system? | |
1186 | * If it is, we should test it again after we do I/O | |
1187 | */ | |
1188 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1189 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1190 | kfree(iov); |
37c0eb46 SF |
1191 | return 0; |
1192 | } | |
1193 | ||
1da177e4 LT |
1194 | xid = GetXid(); |
1195 | ||
37c0eb46 | 1196 | pagevec_init(&pvec, 0); |
111ebb6e | 1197 | if (wbc->range_cyclic) { |
37c0eb46 | 1198 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1199 | end = -1; |
1200 | } else { | |
1201 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1202 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1203 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1204 | range_whole = 1; | |
37c0eb46 SF |
1205 | scanned = 1; |
1206 | } | |
1207 | retry: | |
1208 | while (!done && (index <= end) && | |
1209 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1210 | PAGECACHE_TAG_DIRTY, | |
1211 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1212 | int first; | |
1213 | unsigned int i; | |
1214 | ||
37c0eb46 SF |
1215 | first = -1; |
1216 | next = 0; | |
1217 | n_iov = 0; | |
1218 | bytes_to_write = 0; | |
1219 | ||
1220 | for (i = 0; i < nr_pages; i++) { | |
1221 | page = pvec.pages[i]; | |
1222 | /* | |
1223 | * At this point we hold neither mapping->tree_lock nor | |
1224 | * lock on the page itself: the page may be truncated or | |
1225 | * invalidated (changing page->mapping to NULL), or even | |
1226 | * swizzled back from swapper_space to tmpfs file | |
1227 | * mapping | |
1228 | */ | |
1229 | ||
1230 | if (first < 0) | |
1231 | lock_page(page); | |
1232 | else if (TestSetPageLocked(page)) | |
1233 | break; | |
1234 | ||
1235 | if (unlikely(page->mapping != mapping)) { | |
1236 | unlock_page(page); | |
1237 | break; | |
1238 | } | |
1239 | ||
111ebb6e | 1240 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1241 | done = 1; |
1242 | unlock_page(page); | |
1243 | break; | |
1244 | } | |
1245 | ||
1246 | if (next && (page->index != next)) { | |
1247 | /* Not next consecutive page */ | |
1248 | unlock_page(page); | |
1249 | break; | |
1250 | } | |
1251 | ||
1252 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1253 | wait_on_page_writeback(page); | |
1254 | ||
1255 | if (PageWriteback(page) || | |
cb876f45 | 1256 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1257 | unlock_page(page); |
1258 | break; | |
1259 | } | |
84d2f07e | 1260 | |
cb876f45 LT |
1261 | /* |
1262 | * This actually clears the dirty bit in the radix tree. | |
1263 | * See cifs_writepage() for more commentary. | |
1264 | */ | |
1265 | set_page_writeback(page); | |
1266 | ||
84d2f07e SF |
1267 | if (page_offset(page) >= mapping->host->i_size) { |
1268 | done = 1; | |
1269 | unlock_page(page); | |
cb876f45 | 1270 | end_page_writeback(page); |
84d2f07e SF |
1271 | break; |
1272 | } | |
1273 | ||
37c0eb46 SF |
1274 | /* |
1275 | * BB can we get rid of this? pages are held by pvec | |
1276 | */ | |
1277 | page_cache_get(page); | |
1278 | ||
84d2f07e SF |
1279 | len = min(mapping->host->i_size - page_offset(page), |
1280 | (loff_t)PAGE_CACHE_SIZE); | |
1281 | ||
37c0eb46 SF |
1282 | /* reserve iov[0] for the smb header */ |
1283 | n_iov++; | |
1284 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1285 | iov[n_iov].iov_len = len; |
1286 | bytes_to_write += len; | |
37c0eb46 SF |
1287 | |
1288 | if (first < 0) { | |
1289 | first = i; | |
1290 | offset = page_offset(page); | |
1291 | } | |
1292 | next = page->index + 1; | |
1293 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1294 | break; | |
1295 | } | |
1296 | if (n_iov) { | |
23e7dd7d SF |
1297 | /* Search for a writable handle every time we call |
1298 | * CIFSSMBWrite2. We can't rely on the last handle | |
1299 | * we used to still be valid | |
1300 | */ | |
1301 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1302 | if (!open_file) { | |
1303 | cERROR(1, ("No writable handles for inode")); | |
1304 | rc = -EBADF; | |
1047abc1 | 1305 | } else { |
23e7dd7d SF |
1306 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1307 | open_file->netfid, | |
1308 | bytes_to_write, offset, | |
1309 | &bytes_written, iov, n_iov, | |
1310 | 1); | |
1311 | atomic_dec(&open_file->wrtPending); | |
1312 | if (rc || bytes_written < bytes_to_write) { | |
1313 | cERROR(1,("Write2 ret %d, written = %d", | |
1314 | rc, bytes_written)); | |
1315 | /* BB what if continued retry is | |
1316 | requested via mount flags? */ | |
1317 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1318 | } else { |
1319 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1320 | bytes_written); | |
1321 | } | |
37c0eb46 SF |
1322 | } |
1323 | for (i = 0; i < n_iov; i++) { | |
1324 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1325 | /* Should we also set page error on |
1326 | success rc but too little data written? */ | |
1327 | /* BB investigate retry logic on temporary | |
1328 | server crash cases and how recovery works | |
1329 | when page marked as error */ | |
1330 | if(rc) | |
1331 | SetPageError(page); | |
37c0eb46 SF |
1332 | kunmap(page); |
1333 | unlock_page(page); | |
cb876f45 | 1334 | end_page_writeback(page); |
37c0eb46 SF |
1335 | page_cache_release(page); |
1336 | } | |
1337 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1338 | done = 1; | |
1339 | index = next; | |
1340 | } | |
1341 | pagevec_release(&pvec); | |
1342 | } | |
1343 | if (!scanned && !done) { | |
1344 | /* | |
1345 | * We hit the last page and there is more work to be done: wrap | |
1346 | * back to the start of the file | |
1347 | */ | |
1348 | scanned = 1; | |
1349 | index = 0; | |
1350 | goto retry; | |
1351 | } | |
111ebb6e | 1352 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1353 | mapping->writeback_index = index; |
1354 | ||
1da177e4 | 1355 | FreeXid(xid); |
9a0c8230 | 1356 | kfree(iov); |
1da177e4 LT |
1357 | return rc; |
1358 | } | |
1da177e4 LT |
1359 | |
1360 | static int cifs_writepage(struct page* page, struct writeback_control *wbc) | |
1361 | { | |
1362 | int rc = -EFAULT; | |
1363 | int xid; | |
1364 | ||
1365 | xid = GetXid(); | |
1366 | /* BB add check for wbc flags */ | |
1367 | page_cache_get(page); | |
1368 | if (!PageUptodate(page)) { | |
1369 | cFYI(1, ("ppw - page not up to date")); | |
1370 | } | |
cb876f45 LT |
1371 | |
1372 | /* | |
1373 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1374 | * | |
1375 | * A writepage() implementation always needs to do either this, | |
1376 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1377 | * the case of a failure. | |
1378 | * | |
1379 | * Just unlocking the page will cause the radix tree tag-bits | |
1380 | * to fail to update with the state of the page correctly. | |
1381 | */ | |
1382 | set_page_writeback(page); | |
1da177e4 LT |
1383 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1384 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1385 | unlock_page(page); | |
cb876f45 LT |
1386 | end_page_writeback(page); |
1387 | page_cache_release(page); | |
1da177e4 LT |
1388 | FreeXid(xid); |
1389 | return rc; | |
1390 | } | |
1391 | ||
1392 | static int cifs_commit_write(struct file *file, struct page *page, | |
1393 | unsigned offset, unsigned to) | |
1394 | { | |
1395 | int xid; | |
1396 | int rc = 0; | |
1397 | struct inode *inode = page->mapping->host; | |
1398 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1399 | char *page_data; | |
1400 | ||
1401 | xid = GetXid(); | |
1402 | cFYI(1, ("commit write for page %p up to position %lld for %d", | |
1403 | page, position, to)); | |
3677db10 | 1404 | spin_lock(&inode->i_lock); |
1da177e4 LT |
1405 | if (position > inode->i_size) { |
1406 | i_size_write(inode, position); | |
1407 | /* if (file->private_data == NULL) { | |
1408 | rc = -EBADF; | |
1409 | } else { | |
1410 | open_file = (struct cifsFileInfo *)file->private_data; | |
1411 | cifs_sb = CIFS_SB(inode->i_sb); | |
1412 | rc = -EAGAIN; | |
1413 | while (rc == -EAGAIN) { | |
1414 | if ((open_file->invalidHandle) && | |
1415 | (!open_file->closePend)) { | |
1416 | rc = cifs_reopen_file( | |
e6a00296 | 1417 | file->f_path.dentry->d_inode, file); |
1da177e4 LT |
1418 | if (rc != 0) |
1419 | break; | |
1420 | } | |
1421 | if (!open_file->closePend) { | |
1422 | rc = CIFSSMBSetFileSize(xid, | |
1423 | cifs_sb->tcon, position, | |
1424 | open_file->netfid, | |
1425 | open_file->pid, FALSE); | |
1426 | } else { | |
1427 | rc = -EBADF; | |
1428 | break; | |
1429 | } | |
1430 | } | |
1431 | cFYI(1, (" SetEOF (commit write) rc = %d", rc)); | |
1432 | } */ | |
1433 | } | |
3677db10 | 1434 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
1435 | if (!PageUptodate(page)) { |
1436 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1437 | /* can not rely on (or let) writepage write this data */ | |
1438 | if (to < offset) { | |
1439 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1440 | offset, to)); | |
1441 | FreeXid(xid); | |
1442 | return rc; | |
1443 | } | |
1444 | /* this is probably better than directly calling | |
1445 | partialpage_write since in this function the file handle is | |
1446 | known which we might as well leverage */ | |
1447 | /* BB check if anything else missing out of ppw | |
1448 | such as updating last write time */ | |
1449 | page_data = kmap(page); | |
1450 | rc = cifs_write(file, page_data + offset, to-offset, | |
1451 | &position); | |
1452 | if (rc > 0) | |
1453 | rc = 0; | |
1454 | /* else if (rc < 0) should we set writebehind rc? */ | |
1455 | kunmap(page); | |
1456 | } else { | |
1457 | set_page_dirty(page); | |
1458 | } | |
1459 | ||
1460 | FreeXid(xid); | |
1461 | return rc; | |
1462 | } | |
1463 | ||
1464 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1465 | { | |
1466 | int xid; | |
1467 | int rc = 0; | |
e6a00296 | 1468 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1469 | |
1470 | xid = GetXid(); | |
1471 | ||
26a21b98 | 1472 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 LT |
1473 | dentry->d_name.name, datasync)); |
1474 | ||
1475 | rc = filemap_fdatawrite(inode->i_mapping); | |
1476 | if (rc == 0) | |
1477 | CIFS_I(inode)->write_behind_rc = 0; | |
1478 | FreeXid(xid); | |
1479 | return rc; | |
1480 | } | |
1481 | ||
3978d717 | 1482 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1483 | { |
1484 | struct address_space *mapping; | |
1485 | struct inode *inode; | |
1486 | unsigned long index = page->index; | |
1487 | unsigned int rpages = 0; | |
1488 | int rc = 0; | |
1489 | ||
1490 | cFYI(1, ("sync page %p",page)); | |
1491 | mapping = page->mapping; | |
1492 | if (!mapping) | |
1493 | return 0; | |
1494 | inode = mapping->host; | |
1495 | if (!inode) | |
3978d717 | 1496 | return; */ |
1da177e4 LT |
1497 | |
1498 | /* fill in rpages then | |
1499 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ | |
1500 | ||
26a21b98 | 1501 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1502 | |
3978d717 | 1503 | #if 0 |
1da177e4 LT |
1504 | if (rc < 0) |
1505 | return rc; | |
1506 | return 0; | |
3978d717 | 1507 | #endif |
1da177e4 LT |
1508 | } */ |
1509 | ||
1510 | /* | |
1511 | * As file closes, flush all cached write data for this inode checking | |
1512 | * for write behind errors. | |
1513 | */ | |
75e1fcc0 | 1514 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1515 | { |
e6a00296 | 1516 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1517 | int rc = 0; |
1518 | ||
1519 | /* Rather than do the steps manually: | |
1520 | lock the inode for writing | |
1521 | loop through pages looking for write behind data (dirty pages) | |
1522 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1523 | send to server (prefer in parallel) | |
1524 | deal with writebehind errors | |
1525 | unlock inode for writing | |
1526 | filemapfdatawrite appears easier for the time being */ | |
1527 | ||
1528 | rc = filemap_fdatawrite(inode->i_mapping); | |
1529 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1530 | CIFS_I(inode)->write_behind_rc = 0; | |
1531 | ||
1532 | cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc)); | |
1533 | ||
1534 | return rc; | |
1535 | } | |
1536 | ||
1537 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1538 | size_t read_size, loff_t *poffset) | |
1539 | { | |
1540 | int rc = -EACCES; | |
1541 | unsigned int bytes_read = 0; | |
1542 | unsigned int total_read = 0; | |
1543 | unsigned int current_read_size; | |
1544 | struct cifs_sb_info *cifs_sb; | |
1545 | struct cifsTconInfo *pTcon; | |
1546 | int xid; | |
1547 | struct cifsFileInfo *open_file; | |
1548 | char *smb_read_data; | |
1549 | char __user *current_offset; | |
1550 | struct smb_com_read_rsp *pSMBr; | |
1551 | ||
1552 | xid = GetXid(); | |
e6a00296 | 1553 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1554 | pTcon = cifs_sb->tcon; |
1555 | ||
1556 | if (file->private_data == NULL) { | |
1557 | FreeXid(xid); | |
1558 | return -EBADF; | |
1559 | } | |
1560 | open_file = (struct cifsFileInfo *)file->private_data; | |
1561 | ||
1562 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1563 | cFYI(1, ("attempting read on write only file instance")); | |
1564 | } | |
1565 | for (total_read = 0, current_offset = read_data; | |
1566 | read_size > total_read; | |
1567 | total_read += bytes_read, current_offset += bytes_read) { | |
1568 | current_read_size = min_t(const int, read_size - total_read, | |
1569 | cifs_sb->rsize); | |
1570 | rc = -EAGAIN; | |
1571 | smb_read_data = NULL; | |
1572 | while (rc == -EAGAIN) { | |
ec637e3f | 1573 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1574 | if ((open_file->invalidHandle) && |
1575 | (!open_file->closePend)) { | |
e6a00296 | 1576 | rc = cifs_reopen_file(file->f_path.dentry->d_inode, |
1da177e4 LT |
1577 | file, TRUE); |
1578 | if (rc != 0) | |
1579 | break; | |
1580 | } | |
bfa0d75a | 1581 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1582 | open_file->netfid, |
1583 | current_read_size, *poffset, | |
1584 | &bytes_read, &smb_read_data, | |
1585 | &buf_type); | |
1da177e4 | 1586 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1587 | if (smb_read_data) { |
93544cc6 SF |
1588 | if (copy_to_user(current_offset, |
1589 | smb_read_data + | |
1590 | 4 /* RFC1001 length field */ + | |
1591 | le16_to_cpu(pSMBr->DataOffset), | |
1592 | bytes_read)) { | |
1593 | rc = -EFAULT; | |
1594 | } | |
1595 | ||
ec637e3f SF |
1596 | if(buf_type == CIFS_SMALL_BUFFER) |
1597 | cifs_small_buf_release(smb_read_data); | |
1598 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1599 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1600 | smb_read_data = NULL; |
1601 | } | |
1602 | } | |
1603 | if (rc || (bytes_read == 0)) { | |
1604 | if (total_read) { | |
1605 | break; | |
1606 | } else { | |
1607 | FreeXid(xid); | |
1608 | return rc; | |
1609 | } | |
1610 | } else { | |
a4544347 | 1611 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1612 | *poffset += bytes_read; |
1613 | } | |
1614 | } | |
1615 | FreeXid(xid); | |
1616 | return total_read; | |
1617 | } | |
1618 | ||
1619 | ||
1620 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1621 | loff_t *poffset) | |
1622 | { | |
1623 | int rc = -EACCES; | |
1624 | unsigned int bytes_read = 0; | |
1625 | unsigned int total_read; | |
1626 | unsigned int current_read_size; | |
1627 | struct cifs_sb_info *cifs_sb; | |
1628 | struct cifsTconInfo *pTcon; | |
1629 | int xid; | |
1630 | char *current_offset; | |
1631 | struct cifsFileInfo *open_file; | |
ec637e3f | 1632 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1633 | |
1634 | xid = GetXid(); | |
e6a00296 | 1635 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1636 | pTcon = cifs_sb->tcon; |
1637 | ||
1638 | if (file->private_data == NULL) { | |
1639 | FreeXid(xid); | |
1640 | return -EBADF; | |
1641 | } | |
1642 | open_file = (struct cifsFileInfo *)file->private_data; | |
1643 | ||
1644 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1645 | cFYI(1, ("attempting read on write only file instance")); | |
1646 | ||
1647 | for (total_read = 0, current_offset = read_data; | |
1648 | read_size > total_read; | |
1649 | total_read += bytes_read, current_offset += bytes_read) { | |
1650 | current_read_size = min_t(const int, read_size - total_read, | |
1651 | cifs_sb->rsize); | |
f9f5c817 SF |
1652 | /* For windows me and 9x we do not want to request more |
1653 | than it negotiated since it will refuse the read then */ | |
1654 | if((pTcon->ses) && | |
1655 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { | |
1656 | current_read_size = min_t(const int, current_read_size, | |
1657 | pTcon->ses->server->maxBuf - 128); | |
1658 | } | |
1da177e4 LT |
1659 | rc = -EAGAIN; |
1660 | while (rc == -EAGAIN) { | |
1661 | if ((open_file->invalidHandle) && | |
1662 | (!open_file->closePend)) { | |
e6a00296 | 1663 | rc = cifs_reopen_file(file->f_path.dentry->d_inode, |
1da177e4 LT |
1664 | file, TRUE); |
1665 | if (rc != 0) | |
1666 | break; | |
1667 | } | |
bfa0d75a | 1668 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1669 | open_file->netfid, |
1670 | current_read_size, *poffset, | |
1671 | &bytes_read, ¤t_offset, | |
1672 | &buf_type); | |
1da177e4 LT |
1673 | } |
1674 | if (rc || (bytes_read == 0)) { | |
1675 | if (total_read) { | |
1676 | break; | |
1677 | } else { | |
1678 | FreeXid(xid); | |
1679 | return rc; | |
1680 | } | |
1681 | } else { | |
a4544347 | 1682 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1683 | *poffset += bytes_read; |
1684 | } | |
1685 | } | |
1686 | FreeXid(xid); | |
1687 | return total_read; | |
1688 | } | |
1689 | ||
1690 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1691 | { | |
e6a00296 | 1692 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1693 | int rc, xid; |
1694 | ||
1695 | xid = GetXid(); | |
1696 | rc = cifs_revalidate(dentry); | |
1697 | if (rc) { | |
1698 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1699 | FreeXid(xid); | |
1700 | return rc; | |
1701 | } | |
1702 | rc = generic_file_mmap(file, vma); | |
1703 | FreeXid(xid); | |
1704 | return rc; | |
1705 | } | |
1706 | ||
1707 | ||
1708 | static void cifs_copy_cache_pages(struct address_space *mapping, | |
1709 | struct list_head *pages, int bytes_read, char *data, | |
1710 | struct pagevec *plru_pvec) | |
1711 | { | |
1712 | struct page *page; | |
1713 | char *target; | |
1714 | ||
1715 | while (bytes_read > 0) { | |
1716 | if (list_empty(pages)) | |
1717 | break; | |
1718 | ||
1719 | page = list_entry(pages->prev, struct page, lru); | |
1720 | list_del(&page->lru); | |
1721 | ||
1722 | if (add_to_page_cache(page, mapping, page->index, | |
1723 | GFP_KERNEL)) { | |
1724 | page_cache_release(page); | |
1725 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1726 | data += PAGE_CACHE_SIZE; |
1727 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1728 | continue; |
1729 | } | |
1730 | ||
1731 | target = kmap_atomic(page,KM_USER0); | |
1732 | ||
1733 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1734 | memcpy(target, data, bytes_read); | |
1735 | /* zero the tail end of this partial page */ | |
1736 | memset(target + bytes_read, 0, | |
1737 | PAGE_CACHE_SIZE - bytes_read); | |
1738 | bytes_read = 0; | |
1739 | } else { | |
1740 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1741 | bytes_read -= PAGE_CACHE_SIZE; | |
1742 | } | |
1743 | kunmap_atomic(target, KM_USER0); | |
1744 | ||
1745 | flush_dcache_page(page); | |
1746 | SetPageUptodate(page); | |
1747 | unlock_page(page); | |
1748 | if (!pagevec_add(plru_pvec, page)) | |
1749 | __pagevec_lru_add(plru_pvec); | |
1750 | data += PAGE_CACHE_SIZE; | |
1751 | } | |
1752 | return; | |
1753 | } | |
1754 | ||
1755 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1756 | struct list_head *page_list, unsigned num_pages) | |
1757 | { | |
1758 | int rc = -EACCES; | |
1759 | int xid; | |
1760 | loff_t offset; | |
1761 | struct page *page; | |
1762 | struct cifs_sb_info *cifs_sb; | |
1763 | struct cifsTconInfo *pTcon; | |
1764 | int bytes_read = 0; | |
1765 | unsigned int read_size,i; | |
1766 | char *smb_read_data = NULL; | |
1767 | struct smb_com_read_rsp *pSMBr; | |
1768 | struct pagevec lru_pvec; | |
1769 | struct cifsFileInfo *open_file; | |
ec637e3f | 1770 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1771 | |
1772 | xid = GetXid(); | |
1773 | if (file->private_data == NULL) { | |
1774 | FreeXid(xid); | |
1775 | return -EBADF; | |
1776 | } | |
1777 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1778 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1779 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1780 | |
1da177e4 LT |
1781 | pagevec_init(&lru_pvec, 0); |
1782 | ||
1783 | for (i = 0; i < num_pages; ) { | |
1784 | unsigned contig_pages; | |
1785 | struct page *tmp_page; | |
1786 | unsigned long expected_index; | |
1787 | ||
1788 | if (list_empty(page_list)) | |
1789 | break; | |
1790 | ||
1791 | page = list_entry(page_list->prev, struct page, lru); | |
1792 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1793 | ||
1794 | /* count adjacent pages that we will read into */ | |
1795 | contig_pages = 0; | |
1796 | expected_index = | |
1797 | list_entry(page_list->prev, struct page, lru)->index; | |
1798 | list_for_each_entry_reverse(tmp_page,page_list,lru) { | |
1799 | if (tmp_page->index == expected_index) { | |
1800 | contig_pages++; | |
1801 | expected_index++; | |
1802 | } else | |
1803 | break; | |
1804 | } | |
1805 | if (contig_pages + i > num_pages) | |
1806 | contig_pages = num_pages - i; | |
1807 | ||
1808 | /* for reads over a certain size could initiate async | |
1809 | read ahead */ | |
1810 | ||
1811 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1812 | /* Read size needs to be in multiples of one page */ | |
1813 | read_size = min_t(const unsigned int, read_size, | |
1814 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
1815 | ||
1816 | rc = -EAGAIN; | |
1817 | while (rc == -EAGAIN) { | |
1818 | if ((open_file->invalidHandle) && | |
1819 | (!open_file->closePend)) { | |
e6a00296 | 1820 | rc = cifs_reopen_file(file->f_path.dentry->d_inode, |
1da177e4 LT |
1821 | file, TRUE); |
1822 | if (rc != 0) | |
1823 | break; | |
1824 | } | |
1825 | ||
bfa0d75a | 1826 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1827 | open_file->netfid, |
1828 | read_size, offset, | |
1829 | &bytes_read, &smb_read_data, | |
1830 | &buf_type); | |
a9d02ad4 | 1831 | /* BB more RC checks ? */ |
1da177e4 LT |
1832 | if (rc== -EAGAIN) { |
1833 | if (smb_read_data) { | |
ec637e3f SF |
1834 | if(buf_type == CIFS_SMALL_BUFFER) |
1835 | cifs_small_buf_release(smb_read_data); | |
1836 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1837 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1838 | smb_read_data = NULL; |
1839 | } | |
1840 | } | |
1841 | } | |
1842 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1843 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1844 | break; |
1845 | } else if (bytes_read > 0) { | |
6f88cc2e | 1846 | task_io_account_read(bytes_read); |
1da177e4 LT |
1847 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1848 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1849 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1850 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1851 | ||
1852 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1853 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1854 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1855 | i++; /* account for partial page */ | |
1856 | ||
1857 | /* server copy of file can have smaller size | |
1858 | than client */ | |
1859 | /* BB do we need to verify this common case ? | |
1860 | this case is ok - if we are at server EOF | |
1861 | we will hit it on next read */ | |
1862 | ||
05ac9d4b | 1863 | /* break; */ |
1da177e4 LT |
1864 | } |
1865 | } else { | |
1866 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1867 | "Cleaning remaining pages from readahead list", | |
1868 | bytes_read, offset)); | |
1869 | /* BB turn off caching and do new lookup on | |
1870 | file size at server? */ | |
1da177e4 LT |
1871 | break; |
1872 | } | |
1873 | if (smb_read_data) { | |
ec637e3f SF |
1874 | if(buf_type == CIFS_SMALL_BUFFER) |
1875 | cifs_small_buf_release(smb_read_data); | |
1876 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1877 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1878 | smb_read_data = NULL; |
1879 | } | |
1880 | bytes_read = 0; | |
1881 | } | |
1882 | ||
1883 | pagevec_lru_add(&lru_pvec); | |
1884 | ||
1885 | /* need to free smb_read_data buf before exit */ | |
1886 | if (smb_read_data) { | |
47c886b3 SF |
1887 | if(buf_type == CIFS_SMALL_BUFFER) |
1888 | cifs_small_buf_release(smb_read_data); | |
1889 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1890 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1891 | smb_read_data = NULL; |
1892 | } | |
1893 | ||
1894 | FreeXid(xid); | |
1895 | return rc; | |
1896 | } | |
1897 | ||
1898 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1899 | loff_t *poffset) | |
1900 | { | |
1901 | char *read_data; | |
1902 | int rc; | |
1903 | ||
1904 | page_cache_get(page); | |
1905 | read_data = kmap(page); | |
1906 | /* for reads over a certain size could initiate async read ahead */ | |
1907 | ||
1908 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); | |
1909 | ||
1910 | if (rc < 0) | |
1911 | goto io_error; | |
1912 | else | |
26a21b98 | 1913 | cFYI(1, ("Bytes read %d",rc)); |
1da177e4 | 1914 | |
e6a00296 JJS |
1915 | file->f_path.dentry->d_inode->i_atime = |
1916 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
1da177e4 LT |
1917 | |
1918 | if (PAGE_CACHE_SIZE > rc) | |
1919 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1920 | ||
1921 | flush_dcache_page(page); | |
1922 | SetPageUptodate(page); | |
1923 | rc = 0; | |
1924 | ||
1925 | io_error: | |
1926 | kunmap(page); | |
1927 | page_cache_release(page); | |
1928 | return rc; | |
1929 | } | |
1930 | ||
1931 | static int cifs_readpage(struct file *file, struct page *page) | |
1932 | { | |
1933 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1934 | int rc = -EACCES; | |
1935 | int xid; | |
1936 | ||
1937 | xid = GetXid(); | |
1938 | ||
1939 | if (file->private_data == NULL) { | |
1940 | FreeXid(xid); | |
1941 | return -EBADF; | |
1942 | } | |
1943 | ||
1944 | cFYI(1, ("readpage %p at offset %d 0x%x\n", | |
1945 | page, (int)offset, (int)offset)); | |
1946 | ||
1947 | rc = cifs_readpage_worker(file, page, &offset); | |
1948 | ||
1949 | unlock_page(page); | |
1950 | ||
1951 | FreeXid(xid); | |
1952 | return rc; | |
1953 | } | |
1954 | ||
1955 | /* We do not want to update the file size from server for inodes | |
1956 | open for write - to avoid races with writepage extending | |
1957 | the file - in the future we could consider allowing | |
1958 | refreshing the inode only on increases in the file size | |
1959 | but this is tricky to do without racing with writebehind | |
1960 | page caching in the current Linux kernel design */ | |
7ba52631 | 1961 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 1962 | { |
23e7dd7d SF |
1963 | struct cifsFileInfo *open_file = NULL; |
1964 | ||
1965 | if (cifsInode) | |
1966 | open_file = find_writable_file(cifsInode); | |
1967 | ||
1968 | if(open_file) { | |
c32a0b68 SF |
1969 | struct cifs_sb_info *cifs_sb; |
1970 | ||
23e7dd7d SF |
1971 | /* there is not actually a write pending so let |
1972 | this handle go free and allow it to | |
1973 | be closable if needed */ | |
1974 | atomic_dec(&open_file->wrtPending); | |
c32a0b68 SF |
1975 | |
1976 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); | |
1977 | if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) { | |
1978 | /* since no page cache to corrupt on directio | |
1979 | we can change size safely */ | |
1980 | return 1; | |
1981 | } | |
1982 | ||
7ba52631 SF |
1983 | if(i_size_read(&cifsInode->vfs_inode) < end_of_file) |
1984 | return 1; | |
1985 | ||
6148a742 | 1986 | return 0; |
23e7dd7d | 1987 | } else |
6148a742 | 1988 | return 1; |
1da177e4 LT |
1989 | } |
1990 | ||
1da177e4 LT |
1991 | static int cifs_prepare_write(struct file *file, struct page *page, |
1992 | unsigned from, unsigned to) | |
1993 | { | |
1994 | int rc = 0; | |
8a236264 SF |
1995 | loff_t i_size; |
1996 | loff_t offset; | |
1997 | ||
1da177e4 | 1998 | cFYI(1, ("prepare write for page %p from %d to %d",page,from,to)); |
8a236264 SF |
1999 | if (PageUptodate(page)) |
2000 | return 0; | |
2001 | ||
2002 | /* If we are writing a full page it will be up to date, | |
2003 | no need to read from the server */ | |
2004 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { | |
2005 | SetPageUptodate(page); | |
2006 | return 0; | |
2007 | } | |
2008 | ||
2009 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2010 | i_size = i_size_read(page->mapping->host); | |
2011 | ||
2012 | if ((offset >= i_size) || | |
2013 | ((from == 0) && (offset + to) >= i_size)) { | |
2014 | /* | |
2015 | * We don't need to read data beyond the end of the file. | |
2016 | * zero it, and set the page uptodate | |
2017 | */ | |
2018 | void *kaddr = kmap_atomic(page, KM_USER0); | |
2019 | ||
2020 | if (from) | |
1da177e4 | 2021 | memset(kaddr, 0, from); |
8a236264 | 2022 | if (to < PAGE_CACHE_SIZE) |
1da177e4 | 2023 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); |
8a236264 SF |
2024 | flush_dcache_page(page); |
2025 | kunmap_atomic(kaddr, KM_USER0); | |
2026 | SetPageUptodate(page); | |
2027 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1da177e4 | 2028 | /* might as well read a page, it is fast enough */ |
8a236264 SF |
2029 | rc = cifs_readpage_worker(file, page, &offset); |
2030 | } else { | |
2031 | /* we could try using another file handle if there is one - | |
2032 | but how would we lock it to prevent close of that handle | |
2033 | racing with this read? In any case | |
2034 | this will be written out by commit_write so is fine */ | |
1da177e4 LT |
2035 | } |
2036 | ||
8a236264 SF |
2037 | /* we do not need to pass errors back |
2038 | e.g. if we do not have read access to the file | |
2039 | because cifs_commit_write will do the right thing. -- shaggy */ | |
2040 | ||
1da177e4 LT |
2041 | return 0; |
2042 | } | |
2043 | ||
f5e54d6e | 2044 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2045 | .readpage = cifs_readpage, |
2046 | .readpages = cifs_readpages, | |
2047 | .writepage = cifs_writepage, | |
37c0eb46 | 2048 | .writepages = cifs_writepages, |
1da177e4 LT |
2049 | .prepare_write = cifs_prepare_write, |
2050 | .commit_write = cifs_commit_write, | |
2051 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2052 | /* .sync_page = cifs_sync_page, */ | |
2053 | /* .direct_IO = */ | |
2054 | }; | |
273d81d6 DK |
2055 | |
2056 | /* | |
2057 | * cifs_readpages requires the server to support a buffer large enough to | |
2058 | * contain the header plus one complete page of data. Otherwise, we need | |
2059 | * to leave cifs_readpages out of the address space operations. | |
2060 | */ | |
f5e54d6e | 2061 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2062 | .readpage = cifs_readpage, |
2063 | .writepage = cifs_writepage, | |
2064 | .writepages = cifs_writepages, | |
2065 | .prepare_write = cifs_prepare_write, | |
2066 | .commit_write = cifs_commit_write, | |
2067 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2068 | /* .sync_page = cifs_sync_page, */ | |
2069 | /* .direct_IO = */ | |
2070 | }; |