Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 SF |
5 | * |
6 | * Copyright (C) International Business Machines Corp., 2002,2007 | |
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> |
1da177e4 LT |
33 | #include <asm/div64.h> |
34 | #include "cifsfs.h" | |
35 | #include "cifspdu.h" | |
36 | #include "cifsglob.h" | |
37 | #include "cifsproto.h" | |
38 | #include "cifs_unicode.h" | |
39 | #include "cifs_debug.h" | |
40 | #include "cifs_fs_sb.h" | |
41 | ||
42 | static inline struct cifsFileInfo *cifs_init_private( | |
43 | struct cifsFileInfo *private_data, struct inode *inode, | |
44 | struct file *file, __u16 netfid) | |
45 | { | |
46 | memset(private_data, 0, sizeof(struct cifsFileInfo)); | |
47 | private_data->netfid = netfid; | |
fb8c4b14 | 48 | private_data->pid = current->tgid; |
1da177e4 | 49 | init_MUTEX(&private_data->fh_sem); |
796e5661 | 50 | mutex_init(&private_data->lock_mutex); |
7ee1af76 | 51 | INIT_LIST_HEAD(&private_data->llist); |
1da177e4 LT |
52 | private_data->pfile = file; /* needed for writepage */ |
53 | private_data->pInode = inode; | |
4b18f2a9 SF |
54 | private_data->invalidHandle = false; |
55 | private_data->closePend = false; | |
23e7dd7d SF |
56 | /* we have to track num writers to the inode, since writepages |
57 | does not tell us which handle the write is for so there can | |
58 | be a close (overlapping with write) of the filehandle that | |
59 | cifs_writepages chose to use */ | |
fb8c4b14 | 60 | atomic_set(&private_data->wrtPending, 0); |
1da177e4 LT |
61 | |
62 | return private_data; | |
63 | } | |
64 | ||
65 | static inline int cifs_convert_flags(unsigned int flags) | |
66 | { | |
67 | if ((flags & O_ACCMODE) == O_RDONLY) | |
68 | return GENERIC_READ; | |
69 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
70 | return GENERIC_WRITE; | |
71 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
72 | /* GENERIC_ALL is too much permission to request | |
73 | can cause unnecessary access denied on create */ | |
74 | /* return GENERIC_ALL; */ | |
75 | return (GENERIC_READ | GENERIC_WRITE); | |
76 | } | |
77 | ||
e10f7b55 JL |
78 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
79 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
80 | FILE_READ_DATA); | |
81 | ||
82 | ||
1da177e4 LT |
83 | } |
84 | ||
85 | static inline int cifs_get_disposition(unsigned int flags) | |
86 | { | |
87 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
88 | return FILE_CREATE; | |
89 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
90 | return FILE_OVERWRITE_IF; | |
91 | else if ((flags & O_CREAT) == O_CREAT) | |
92 | return FILE_OPEN_IF; | |
55aa2e09 SF |
93 | else if ((flags & O_TRUNC) == O_TRUNC) |
94 | return FILE_OVERWRITE; | |
1da177e4 LT |
95 | else |
96 | return FILE_OPEN; | |
97 | } | |
98 | ||
99 | /* all arguments to this function must be checked for validity in caller */ | |
100 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
101 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
102 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
103 | char *full_path, int xid) | |
104 | { | |
105 | struct timespec temp; | |
106 | int rc; | |
107 | ||
108 | /* want handles we can use to read with first | |
109 | in the list so we do not have to walk the | |
110 | list to search for one in prepare_write */ | |
111 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
fb8c4b14 | 112 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
113 | &pCifsInode->openFileList); |
114 | } else { | |
115 | list_add(&pCifsFile->flist, | |
116 | &pCifsInode->openFileList); | |
117 | } | |
118 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
119 | if (pCifsInode->clientCanCacheRead) { |
120 | /* we have the inode open somewhere else | |
121 | no need to discard cache data */ | |
122 | goto client_can_cache; | |
123 | } | |
124 | ||
125 | /* BB need same check in cifs_create too? */ | |
126 | /* if not oplocked, invalidate inode pages if mtime or file | |
127 | size changed */ | |
128 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
129 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
130 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
131 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
132 | cFYI(1, ("inode unchanged on server")); | |
133 | } else { | |
e6a00296 | 134 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
135 | /* BB no need to lock inode until after invalidate |
136 | since namei code should already have it locked? */ | |
cea21805 JL |
137 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
138 | if (rc != 0) | |
139 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
140 | } |
141 | cFYI(1, ("invalidating remote inode since open detected it " | |
142 | "changed")); | |
e6a00296 | 143 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
144 | } |
145 | ||
146 | client_can_cache: | |
c18c842b | 147 | if (pTcon->unix_ext) |
e6a00296 | 148 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
149 | full_path, inode->i_sb, xid); |
150 | else | |
e6a00296 | 151 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 152 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
153 | |
154 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
155 | pCifsInode->clientCanCacheAll = true; |
156 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 157 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 158 | file->f_path.dentry->d_inode)); |
1da177e4 | 159 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 160 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
161 | |
162 | return rc; | |
163 | } | |
164 | ||
165 | int cifs_open(struct inode *inode, struct file *file) | |
166 | { | |
167 | int rc = -EACCES; | |
168 | int xid, oplock; | |
169 | struct cifs_sb_info *cifs_sb; | |
170 | struct cifsTconInfo *pTcon; | |
171 | struct cifsFileInfo *pCifsFile; | |
172 | struct cifsInodeInfo *pCifsInode; | |
173 | struct list_head *tmp; | |
174 | char *full_path = NULL; | |
175 | int desiredAccess; | |
176 | int disposition; | |
177 | __u16 netfid; | |
178 | FILE_ALL_INFO *buf = NULL; | |
179 | ||
180 | xid = GetXid(); | |
181 | ||
182 | cifs_sb = CIFS_SB(inode->i_sb); | |
183 | pTcon = cifs_sb->tcon; | |
184 | ||
185 | if (file->f_flags & O_CREAT) { | |
186 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 187 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
188 | read_lock(&GlobalSMBSeslock); |
189 | list_for_each(tmp, &pCifsInode->openFileList) { | |
190 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
191 | flist); | |
192 | if ((pCifsFile->pfile == NULL) && | |
193 | (pCifsFile->pid == current->tgid)) { | |
194 | /* mode set in cifs_create */ | |
195 | ||
196 | /* needed for writepage */ | |
197 | pCifsFile->pfile = file; | |
50c2f753 | 198 | |
1da177e4 LT |
199 | file->private_data = pCifsFile; |
200 | break; | |
201 | } | |
202 | } | |
203 | read_unlock(&GlobalSMBSeslock); | |
204 | if (file->private_data != NULL) { | |
205 | rc = 0; | |
206 | FreeXid(xid); | |
207 | return rc; | |
208 | } else { | |
209 | if (file->f_flags & O_EXCL) | |
210 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 211 | "new file %p", file)); |
1da177e4 LT |
212 | } |
213 | } | |
214 | ||
e6a00296 | 215 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
216 | if (full_path == NULL) { |
217 | FreeXid(xid); | |
218 | return -ENOMEM; | |
219 | } | |
220 | ||
7521a3c5 | 221 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 LT |
222 | inode, file->f_flags, full_path)); |
223 | desiredAccess = cifs_convert_flags(file->f_flags); | |
224 | ||
225 | /********************************************************************* | |
226 | * open flag mapping table: | |
fb8c4b14 | 227 | * |
1da177e4 | 228 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 229 | * ---------- ---------------- |
1da177e4 LT |
230 | * O_CREAT FILE_OPEN_IF |
231 | * O_CREAT | O_EXCL FILE_CREATE | |
232 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
233 | * O_TRUNC FILE_OVERWRITE | |
234 | * none of the above FILE_OPEN | |
235 | * | |
236 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 237 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
238 | * O_CREAT | O_TRUNC is similar but truncates the existing |
239 | * file rather than creating a new file as FILE_SUPERSEDE does | |
240 | * (which uses the attributes / metadata passed in on open call) | |
241 | *? | |
fb8c4b14 | 242 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
243 | *? and the read write flags match reasonably. O_LARGEFILE |
244 | *? is irrelevant because largefile support is always used | |
245 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
246 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
247 | *********************************************************************/ | |
248 | ||
249 | disposition = cifs_get_disposition(file->f_flags); | |
250 | ||
251 | if (oplockEnabled) | |
252 | oplock = REQ_OPLOCK; | |
253 | else | |
4b18f2a9 | 254 | oplock = 0; |
1da177e4 LT |
255 | |
256 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
257 | ||
258 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
259 | and calling get_inode_info with returned buf (at least helps | |
260 | non-Unix server case) */ | |
261 | ||
fb8c4b14 SF |
262 | /* BB we can not do this if this is the second open of a file |
263 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
264 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
265 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
266 | if (!buf) { | |
267 | rc = -ENOMEM; | |
268 | goto out; | |
269 | } | |
5bafd765 SF |
270 | |
271 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
fb8c4b14 | 272 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, |
5bafd765 | 273 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
274 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
275 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
276 | else |
277 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
278 | ||
a9d02ad4 SF |
279 | if (rc == -EIO) { |
280 | /* Old server, try legacy style OpenX */ | |
281 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
282 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
283 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
284 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
285 | } | |
1da177e4 | 286 | if (rc) { |
26a21b98 | 287 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
288 | goto out; |
289 | } | |
290 | file->private_data = | |
291 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
292 | if (file->private_data == NULL) { | |
293 | rc = -ENOMEM; | |
294 | goto out; | |
295 | } | |
296 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 LT |
297 | write_lock(&GlobalSMBSeslock); |
298 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
299 | ||
e6a00296 | 300 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
301 | if (pCifsInode) { |
302 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
303 | pCifsFile, pTcon, | |
304 | &oplock, buf, full_path, xid); | |
305 | } else { | |
306 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
307 | } |
308 | ||
fb8c4b14 | 309 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
310 | /* time to set mode which we can not set earlier due to |
311 | problems creating new read-only files */ | |
c18c842b | 312 | if (pTcon->unix_ext) { |
4e1e7fb9 JL |
313 | struct cifs_unix_set_info_args args = { |
314 | .mode = inode->i_mode, | |
315 | .uid = NO_CHANGE_64, | |
316 | .gid = NO_CHANGE_64, | |
317 | .ctime = NO_CHANGE_64, | |
318 | .atime = NO_CHANGE_64, | |
319 | .mtime = NO_CHANGE_64, | |
320 | .device = 0, | |
321 | }; | |
322 | CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args, | |
737b758c | 323 | cifs_sb->local_nls, |
fb8c4b14 | 324 | cifs_sb->mnt_cifs_flags & |
737b758c | 325 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
326 | } |
327 | } | |
328 | ||
329 | out: | |
330 | kfree(buf); | |
331 | kfree(full_path); | |
332 | FreeXid(xid); | |
333 | return rc; | |
334 | } | |
335 | ||
0418726b | 336 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
337 | /* to server was lost */ |
338 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
339 | { | |
340 | int rc = 0; | |
341 | ||
342 | /* BB list all locks open on this file and relock */ | |
343 | ||
344 | return rc; | |
345 | } | |
346 | ||
4b18f2a9 | 347 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
348 | { |
349 | int rc = -EACCES; | |
350 | int xid, oplock; | |
351 | struct cifs_sb_info *cifs_sb; | |
352 | struct cifsTconInfo *pTcon; | |
353 | struct cifsFileInfo *pCifsFile; | |
354 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 355 | struct inode *inode; |
1da177e4 LT |
356 | char *full_path = NULL; |
357 | int desiredAccess; | |
358 | int disposition = FILE_OPEN; | |
359 | __u16 netfid; | |
360 | ||
ad7a2926 | 361 | if (file->private_data) |
1da177e4 | 362 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 363 | else |
1da177e4 LT |
364 | return -EBADF; |
365 | ||
366 | xid = GetXid(); | |
367 | down(&pCifsFile->fh_sem); | |
4b18f2a9 | 368 | if (!pCifsFile->invalidHandle) { |
1da177e4 LT |
369 | up(&pCifsFile->fh_sem); |
370 | FreeXid(xid); | |
371 | return 0; | |
372 | } | |
373 | ||
e6a00296 | 374 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
375 | cERROR(1, ("no valid name if dentry freed")); |
376 | dump_stack(); | |
377 | rc = -EBADF; | |
378 | goto reopen_error_exit; | |
379 | } | |
380 | ||
381 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 382 | if (inode == NULL) { |
3a9f462f SF |
383 | cERROR(1, ("inode not valid")); |
384 | dump_stack(); | |
385 | rc = -EBADF; | |
386 | goto reopen_error_exit; | |
1da177e4 | 387 | } |
50c2f753 | 388 | |
1da177e4 LT |
389 | cifs_sb = CIFS_SB(inode->i_sb); |
390 | pTcon = cifs_sb->tcon; | |
3a9f462f | 391 | |
1da177e4 LT |
392 | /* can not grab rename sem here because various ops, including |
393 | those that already have the rename sem can end up causing writepage | |
394 | to get called and if the server was down that means we end up here, | |
395 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 396 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 397 | if (full_path == NULL) { |
3a9f462f SF |
398 | rc = -ENOMEM; |
399 | reopen_error_exit: | |
1da177e4 LT |
400 | up(&pCifsFile->fh_sem); |
401 | FreeXid(xid); | |
3a9f462f | 402 | return rc; |
1da177e4 LT |
403 | } |
404 | ||
3a9f462f | 405 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 406 | inode, file->f_flags, full_path)); |
1da177e4 LT |
407 | desiredAccess = cifs_convert_flags(file->f_flags); |
408 | ||
409 | if (oplockEnabled) | |
410 | oplock = REQ_OPLOCK; | |
411 | else | |
4b18f2a9 | 412 | oplock = 0; |
1da177e4 LT |
413 | |
414 | /* Can not refresh inode by passing in file_info buf to be returned | |
fb8c4b14 SF |
415 | by SMBOpen and then calling get_inode_info with returned buf |
416 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
417 | and server version of file size can be stale. If we knew for sure |
418 | that inode was not dirty locally we could do this */ | |
419 | ||
1da177e4 LT |
420 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, |
421 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
fb8c4b14 | 422 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 423 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
424 | if (rc) { |
425 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
426 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
427 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 LT |
428 | } else { |
429 | pCifsFile->netfid = netfid; | |
4b18f2a9 | 430 | pCifsFile->invalidHandle = false; |
1da177e4 LT |
431 | up(&pCifsFile->fh_sem); |
432 | pCifsInode = CIFS_I(inode); | |
433 | if (pCifsInode) { | |
434 | if (can_flush) { | |
cea21805 JL |
435 | rc = filemap_write_and_wait(inode->i_mapping); |
436 | if (rc != 0) | |
437 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
438 | /* temporarily disable caching while we |
439 | go to server to get inode info */ | |
4b18f2a9 SF |
440 | pCifsInode->clientCanCacheAll = false; |
441 | pCifsInode->clientCanCacheRead = false; | |
c18c842b | 442 | if (pTcon->unix_ext) |
1da177e4 LT |
443 | rc = cifs_get_inode_info_unix(&inode, |
444 | full_path, inode->i_sb, xid); | |
445 | else | |
446 | rc = cifs_get_inode_info(&inode, | |
447 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 448 | xid, NULL); |
1da177e4 LT |
449 | } /* else we are writing out data to server already |
450 | and could deadlock if we tried to flush data, and | |
451 | since we do not know if we have data that would | |
452 | invalidate the current end of file on the server | |
453 | we can not go to the server to get the new inod | |
454 | info */ | |
455 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
456 | pCifsInode->clientCanCacheAll = true; |
457 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 458 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 459 | file->f_path.dentry->d_inode)); |
1da177e4 | 460 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
461 | pCifsInode->clientCanCacheRead = true; |
462 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 463 | } else { |
4b18f2a9 SF |
464 | pCifsInode->clientCanCacheRead = false; |
465 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
466 | } |
467 | cifs_relock_file(pCifsFile); | |
468 | } | |
469 | } | |
470 | ||
471 | kfree(full_path); | |
472 | FreeXid(xid); | |
473 | return rc; | |
474 | } | |
475 | ||
476 | int cifs_close(struct inode *inode, struct file *file) | |
477 | { | |
478 | int rc = 0; | |
15745320 | 479 | int xid, timeout; |
1da177e4 LT |
480 | struct cifs_sb_info *cifs_sb; |
481 | struct cifsTconInfo *pTcon; | |
482 | struct cifsFileInfo *pSMBFile = | |
483 | (struct cifsFileInfo *)file->private_data; | |
484 | ||
485 | xid = GetXid(); | |
486 | ||
487 | cifs_sb = CIFS_SB(inode->i_sb); | |
488 | pTcon = cifs_sb->tcon; | |
489 | if (pSMBFile) { | |
7ee1af76 JA |
490 | struct cifsLockInfo *li, *tmp; |
491 | ||
4b18f2a9 | 492 | pSMBFile->closePend = true; |
1da177e4 LT |
493 | if (pTcon) { |
494 | /* no sense reconnecting to close a file that is | |
495 | already closed */ | |
496 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
15745320 | 497 | timeout = 2; |
fb8c4b14 | 498 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 499 | && (timeout <= 2048)) { |
23e7dd7d SF |
500 | /* Give write a better chance to get to |
501 | server ahead of the close. We do not | |
502 | want to add a wait_q here as it would | |
503 | increase the memory utilization as | |
504 | the struct would be in each open file, | |
fb8c4b14 | 505 | but this should give enough time to |
23e7dd7d | 506 | clear the socket */ |
90c81e0b SF |
507 | cFYI(DBG2, |
508 | ("close delay, write pending")); | |
23e7dd7d SF |
509 | msleep(timeout); |
510 | timeout *= 4; | |
4891d539 | 511 | } |
fb8c4b14 | 512 | if (atomic_read(&pSMBFile->wrtPending)) |
63135e08 SF |
513 | cERROR(1, |
514 | ("close with pending writes")); | |
1da177e4 LT |
515 | rc = CIFSSMBClose(xid, pTcon, |
516 | pSMBFile->netfid); | |
1da177e4 LT |
517 | } |
518 | } | |
7ee1af76 JA |
519 | |
520 | /* Delete any outstanding lock records. | |
521 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 522 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
523 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
524 | list_del(&li->llist); | |
525 | kfree(li); | |
526 | } | |
796e5661 | 527 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 528 | |
cbe0476f | 529 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
530 | list_del(&pSMBFile->flist); |
531 | list_del(&pSMBFile->tlist); | |
cbe0476f | 532 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
533 | timeout = 10; |
534 | /* We waited above to give the SMBWrite a chance to issue | |
535 | on the wire (so we do not get SMBWrite returning EBADF | |
536 | if writepages is racing with close. Note that writepages | |
537 | does not specify a file handle, so it is possible for a file | |
538 | to be opened twice, and the application close the "wrong" | |
539 | file handle - in these cases we delay long enough to allow | |
540 | the SMBWrite to get on the wire before the SMB Close. | |
541 | We allow total wait here over 45 seconds, more than | |
542 | oplock break time, and more than enough to allow any write | |
543 | to complete on the server, or to time out on the client */ | |
544 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
545 | && (timeout <= 50000)) { | |
546 | cERROR(1, ("writes pending, delay free of handle")); | |
547 | msleep(timeout); | |
548 | timeout *= 8; | |
549 | } | |
1da177e4 LT |
550 | kfree(file->private_data); |
551 | file->private_data = NULL; | |
552 | } else | |
553 | rc = -EBADF; | |
554 | ||
4efa53f0 | 555 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
556 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
557 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
558 | /* if the file is not open we do not know if we can cache info | |
559 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
560 | CIFS_I(inode)->clientCanCacheRead = false; |
561 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 562 | } |
4efa53f0 | 563 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 564 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
565 | rc = CIFS_I(inode)->write_behind_rc; |
566 | FreeXid(xid); | |
567 | return rc; | |
568 | } | |
569 | ||
570 | int cifs_closedir(struct inode *inode, struct file *file) | |
571 | { | |
572 | int rc = 0; | |
573 | int xid; | |
574 | struct cifsFileInfo *pCFileStruct = | |
575 | (struct cifsFileInfo *)file->private_data; | |
576 | char *ptmp; | |
577 | ||
26a21b98 | 578 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
579 | |
580 | xid = GetXid(); | |
581 | ||
582 | if (pCFileStruct) { | |
583 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
584 | struct cifs_sb_info *cifs_sb = |
585 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
586 | |
587 | pTcon = cifs_sb->tcon; | |
588 | ||
589 | cFYI(1, ("Freeing private data in close dir")); | |
4b18f2a9 SF |
590 | if (!pCFileStruct->srch_inf.endOfSearch && |
591 | !pCFileStruct->invalidHandle) { | |
592 | pCFileStruct->invalidHandle = true; | |
1da177e4 LT |
593 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
594 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
595 | rc)); | |
596 | /* not much we can do if it fails anyway, ignore rc */ | |
597 | rc = 0; | |
598 | } | |
599 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
600 | if (ptmp) { | |
ec637e3f | 601 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 602 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 603 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
604 | cifs_small_buf_release(ptmp); |
605 | else | |
606 | cifs_buf_release(ptmp); | |
1da177e4 | 607 | } |
1da177e4 LT |
608 | kfree(file->private_data); |
609 | file->private_data = NULL; | |
610 | } | |
611 | /* BB can we lock the filestruct while this is going on? */ | |
612 | FreeXid(xid); | |
613 | return rc; | |
614 | } | |
615 | ||
7ee1af76 JA |
616 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
617 | __u64 offset, __u8 lockType) | |
618 | { | |
fb8c4b14 SF |
619 | struct cifsLockInfo *li = |
620 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
621 | if (li == NULL) |
622 | return -ENOMEM; | |
623 | li->offset = offset; | |
624 | li->length = len; | |
625 | li->type = lockType; | |
796e5661 | 626 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 627 | list_add(&li->llist, &fid->llist); |
796e5661 | 628 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
629 | return 0; |
630 | } | |
631 | ||
1da177e4 LT |
632 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
633 | { | |
634 | int rc, xid; | |
1da177e4 LT |
635 | __u32 numLock = 0; |
636 | __u32 numUnlock = 0; | |
637 | __u64 length; | |
4b18f2a9 | 638 | bool wait_flag = false; |
1da177e4 LT |
639 | struct cifs_sb_info *cifs_sb; |
640 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
641 | __u16 netfid; |
642 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
4b18f2a9 | 643 | bool posix_locking; |
1da177e4 LT |
644 | |
645 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
646 | rc = -EACCES; | |
647 | xid = GetXid(); | |
648 | ||
649 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
650 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
651 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
652 | pfLock->fl_end)); | |
1da177e4 LT |
653 | |
654 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 655 | cFYI(1, ("Posix")); |
1da177e4 | 656 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 657 | cFYI(1, ("Flock")); |
1da177e4 | 658 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 659 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 660 | wait_flag = true; |
1da177e4 LT |
661 | } |
662 | if (pfLock->fl_flags & FL_ACCESS) | |
663 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 664 | "not implemented yet")); |
1da177e4 LT |
665 | if (pfLock->fl_flags & FL_LEASE) |
666 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 667 | if (pfLock->fl_flags & |
1da177e4 LT |
668 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
669 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
670 | ||
671 | if (pfLock->fl_type == F_WRLCK) { | |
672 | cFYI(1, ("F_WRLCK ")); | |
673 | numLock = 1; | |
674 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 675 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 676 | numUnlock = 1; |
d47d7c1a SF |
677 | /* Check if unlock includes more than |
678 | one lock range */ | |
1da177e4 | 679 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 680 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
681 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
682 | numLock = 1; | |
683 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 684 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
685 | numLock = 1; |
686 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 687 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
688 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
689 | numLock = 1; | |
690 | } else | |
d47d7c1a | 691 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 692 | |
e6a00296 | 693 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
694 | pTcon = cifs_sb->tcon; |
695 | ||
696 | if (file->private_data == NULL) { | |
697 | FreeXid(xid); | |
698 | return -EBADF; | |
699 | } | |
08547b03 SF |
700 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
701 | ||
7ee1af76 JA |
702 | posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
703 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability)); | |
1da177e4 | 704 | |
08547b03 SF |
705 | /* BB add code here to normalize offset and length to |
706 | account for negative length which we can not accept over the | |
707 | wire */ | |
1da177e4 | 708 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 709 | if (posix_locking) { |
08547b03 | 710 | int posix_lock_type; |
fb8c4b14 | 711 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
712 | posix_lock_type = CIFS_RDLCK; |
713 | else | |
714 | posix_lock_type = CIFS_WRLCK; | |
715 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, | |
fc94cdb9 | 716 | length, pfLock, |
08547b03 SF |
717 | posix_lock_type, wait_flag); |
718 | FreeXid(xid); | |
719 | return rc; | |
720 | } | |
721 | ||
722 | /* BB we could chain these into one lock request BB */ | |
723 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
724 | 0, 1, lockType, 0 /* wait flag */ ); | |
1da177e4 | 725 | if (rc == 0) { |
fb8c4b14 | 726 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
1da177e4 LT |
727 | pfLock->fl_start, 1 /* numUnlock */ , |
728 | 0 /* numLock */ , lockType, | |
729 | 0 /* wait flag */ ); | |
730 | pfLock->fl_type = F_UNLCK; | |
731 | if (rc != 0) | |
732 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 733 | "range %d during test of lock", rc)); |
1da177e4 LT |
734 | rc = 0; |
735 | ||
736 | } else { | |
737 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
738 | rc = 0; /* do not change lock type to unlock | |
739 | since range in use */ | |
740 | } | |
741 | ||
742 | FreeXid(xid); | |
743 | return rc; | |
744 | } | |
7ee1af76 JA |
745 | |
746 | if (!numLock && !numUnlock) { | |
747 | /* if no lock or unlock then nothing | |
748 | to do since we do not know what it is */ | |
749 | FreeXid(xid); | |
750 | return -EOPNOTSUPP; | |
751 | } | |
752 | ||
753 | if (posix_locking) { | |
08547b03 | 754 | int posix_lock_type; |
fb8c4b14 | 755 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
756 | posix_lock_type = CIFS_RDLCK; |
757 | else | |
758 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 759 | |
fb8c4b14 | 760 | if (numUnlock == 1) |
beb84dc8 | 761 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 762 | |
08547b03 | 763 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, |
fc94cdb9 | 764 | length, pfLock, |
08547b03 | 765 | posix_lock_type, wait_flag); |
7ee1af76 | 766 | } else { |
fb8c4b14 SF |
767 | struct cifsFileInfo *fid = |
768 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
769 | |
770 | if (numLock) { | |
fb8c4b14 SF |
771 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
772 | pfLock->fl_start, | |
7ee1af76 JA |
773 | 0, numLock, lockType, wait_flag); |
774 | ||
775 | if (rc == 0) { | |
776 | /* For Windows locks we must store them. */ | |
777 | rc = store_file_lock(fid, length, | |
778 | pfLock->fl_start, lockType); | |
779 | } | |
780 | } else if (numUnlock) { | |
781 | /* For each stored lock that this unlock overlaps | |
782 | completely, unlock it. */ | |
783 | int stored_rc = 0; | |
784 | struct cifsLockInfo *li, *tmp; | |
785 | ||
6b70c955 | 786 | rc = 0; |
796e5661 | 787 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
788 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
789 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 790 | (pfLock->fl_start + length) >= |
39db810c | 791 | (li->offset + li->length)) { |
fb8c4b14 SF |
792 | stored_rc = CIFSSMBLock(xid, pTcon, |
793 | netfid, | |
7ee1af76 | 794 | li->length, li->offset, |
4b18f2a9 | 795 | 1, 0, li->type, false); |
7ee1af76 JA |
796 | if (stored_rc) |
797 | rc = stored_rc; | |
798 | ||
799 | list_del(&li->llist); | |
800 | kfree(li); | |
801 | } | |
802 | } | |
796e5661 | 803 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
804 | } |
805 | } | |
806 | ||
d634cc15 | 807 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
808 | posix_lock_file_wait(file, pfLock); |
809 | FreeXid(xid); | |
810 | return rc; | |
811 | } | |
812 | ||
813 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
814 | size_t write_size, loff_t *poffset) | |
815 | { | |
816 | int rc = 0; | |
817 | unsigned int bytes_written = 0; | |
818 | unsigned int total_written; | |
819 | struct cifs_sb_info *cifs_sb; | |
820 | struct cifsTconInfo *pTcon; | |
821 | int xid, long_op; | |
822 | struct cifsFileInfo *open_file; | |
823 | ||
e6a00296 | 824 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
825 | |
826 | pTcon = cifs_sb->tcon; | |
827 | ||
828 | /* cFYI(1, | |
829 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 830 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
831 | |
832 | if (file->private_data == NULL) | |
833 | return -EBADF; | |
c33f8d32 | 834 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 835 | |
1da177e4 | 836 | xid = GetXid(); |
1da177e4 | 837 | |
e6a00296 | 838 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
133672ef | 839 | long_op = CIFS_VLONG_OP; /* writes past EOF take long time */ |
1da177e4 | 840 | else |
133672ef | 841 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
842 | |
843 | for (total_written = 0; write_size > total_written; | |
844 | total_written += bytes_written) { | |
845 | rc = -EAGAIN; | |
846 | while (rc == -EAGAIN) { | |
847 | if (file->private_data == NULL) { | |
848 | /* file has been closed on us */ | |
849 | FreeXid(xid); | |
850 | /* if we have gotten here we have written some data | |
851 | and blocked, and the file has been freed on us while | |
852 | we blocked so return what we managed to write */ | |
853 | return total_written; | |
fb8c4b14 | 854 | } |
1da177e4 LT |
855 | if (open_file->closePend) { |
856 | FreeXid(xid); | |
857 | if (total_written) | |
858 | return total_written; | |
859 | else | |
860 | return -EBADF; | |
861 | } | |
862 | if (open_file->invalidHandle) { | |
1da177e4 LT |
863 | /* we could deadlock if we called |
864 | filemap_fdatawait from here so tell | |
865 | reopen_file not to flush data to server | |
866 | now */ | |
4b18f2a9 | 867 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
868 | if (rc != 0) |
869 | break; | |
870 | } | |
871 | ||
872 | rc = CIFSSMBWrite(xid, pTcon, | |
873 | open_file->netfid, | |
874 | min_t(const int, cifs_sb->wsize, | |
875 | write_size - total_written), | |
876 | *poffset, &bytes_written, | |
877 | NULL, write_data + total_written, long_op); | |
878 | } | |
879 | if (rc || (bytes_written == 0)) { | |
880 | if (total_written) | |
881 | break; | |
882 | else { | |
883 | FreeXid(xid); | |
884 | return rc; | |
885 | } | |
886 | } else | |
887 | *poffset += bytes_written; | |
133672ef | 888 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
889 | 15 seconds is plenty */ |
890 | } | |
891 | ||
a4544347 | 892 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
893 | |
894 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
895 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
896 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
897 | /* Do not update local mtime - server will set its actual value on write |
898 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
899 | * current_fs_time(inode->i_sb);*/ |
900 | if (total_written > 0) { | |
901 | spin_lock(&inode->i_lock); | |
902 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
903 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 904 | *poffset); |
3677db10 | 905 | spin_unlock(&inode->i_lock); |
1da177e4 | 906 | } |
fb8c4b14 | 907 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
908 | } |
909 | FreeXid(xid); | |
910 | return total_written; | |
911 | } | |
912 | ||
913 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
914 | size_t write_size, loff_t *poffset) | |
915 | { | |
916 | int rc = 0; | |
917 | unsigned int bytes_written = 0; | |
918 | unsigned int total_written; | |
919 | struct cifs_sb_info *cifs_sb; | |
920 | struct cifsTconInfo *pTcon; | |
921 | int xid, long_op; | |
922 | struct cifsFileInfo *open_file; | |
923 | ||
e6a00296 | 924 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
925 | |
926 | pTcon = cifs_sb->tcon; | |
927 | ||
fb8c4b14 | 928 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 929 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
930 | |
931 | if (file->private_data == NULL) | |
932 | return -EBADF; | |
c33f8d32 | 933 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 934 | |
1da177e4 | 935 | xid = GetXid(); |
1da177e4 | 936 | |
e6a00296 | 937 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
133672ef | 938 | long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */ |
1da177e4 | 939 | else |
133672ef | 940 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
941 | |
942 | for (total_written = 0; write_size > total_written; | |
943 | total_written += bytes_written) { | |
944 | rc = -EAGAIN; | |
945 | while (rc == -EAGAIN) { | |
946 | if (file->private_data == NULL) { | |
947 | /* file has been closed on us */ | |
948 | FreeXid(xid); | |
949 | /* if we have gotten here we have written some data | |
950 | and blocked, and the file has been freed on us | |
fb8c4b14 | 951 | while we blocked so return what we managed to |
1da177e4 LT |
952 | write */ |
953 | return total_written; | |
fb8c4b14 | 954 | } |
1da177e4 LT |
955 | if (open_file->closePend) { |
956 | FreeXid(xid); | |
957 | if (total_written) | |
958 | return total_written; | |
959 | else | |
960 | return -EBADF; | |
961 | } | |
962 | if (open_file->invalidHandle) { | |
1da177e4 LT |
963 | /* we could deadlock if we called |
964 | filemap_fdatawait from here so tell | |
fb8c4b14 | 965 | reopen_file not to flush data to |
1da177e4 | 966 | server now */ |
4b18f2a9 | 967 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
968 | if (rc != 0) |
969 | break; | |
970 | } | |
fb8c4b14 SF |
971 | if (experimEnabled || (pTcon->ses->server && |
972 | ((pTcon->ses->server->secMode & | |
08775834 | 973 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 974 | == 0))) { |
3e84469d SF |
975 | struct kvec iov[2]; |
976 | unsigned int len; | |
977 | ||
0ae0efad | 978 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
979 | write_size - total_written); |
980 | /* iov[0] is reserved for smb header */ | |
981 | iov[1].iov_base = (char *)write_data + | |
982 | total_written; | |
983 | iov[1].iov_len = len; | |
d6e04ae6 | 984 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 985 | open_file->netfid, len, |
d6e04ae6 | 986 | *poffset, &bytes_written, |
3e84469d | 987 | iov, 1, long_op); |
d6e04ae6 | 988 | } else |
60808233 SF |
989 | rc = CIFSSMBWrite(xid, pTcon, |
990 | open_file->netfid, | |
991 | min_t(const int, cifs_sb->wsize, | |
992 | write_size - total_written), | |
993 | *poffset, &bytes_written, | |
994 | write_data + total_written, | |
995 | NULL, long_op); | |
1da177e4 LT |
996 | } |
997 | if (rc || (bytes_written == 0)) { | |
998 | if (total_written) | |
999 | break; | |
1000 | else { | |
1001 | FreeXid(xid); | |
1002 | return rc; | |
1003 | } | |
1004 | } else | |
1005 | *poffset += bytes_written; | |
133672ef | 1006 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1007 | 15 seconds is plenty */ |
1008 | } | |
1009 | ||
a4544347 | 1010 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1011 | |
1012 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1013 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1014 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1015 | /* file->f_path.dentry->d_inode->i_ctime = |
1016 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1017 | if (total_written > 0) { | |
1018 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1019 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1020 | i_size_write(file->f_path.dentry->d_inode, | |
1021 | *poffset); | |
1022 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1023 | } |
3677db10 | 1024 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1025 | } |
1026 | FreeXid(xid); | |
1027 | return total_written; | |
1028 | } | |
1029 | ||
630f3f0c SF |
1030 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1031 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1032 | { | |
1033 | struct cifsFileInfo *open_file = NULL; | |
1034 | ||
1035 | read_lock(&GlobalSMBSeslock); | |
1036 | /* we could simply get the first_list_entry since write-only entries | |
1037 | are always at the end of the list but since the first entry might | |
1038 | have a close pending, we go through the whole list */ | |
1039 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1040 | if (open_file->closePend) | |
1041 | continue; | |
1042 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1043 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1044 | if (!open_file->invalidHandle) { | |
1045 | /* found a good file */ | |
1046 | /* lock it so it will not be closed on us */ | |
1047 | atomic_inc(&open_file->wrtPending); | |
1048 | read_unlock(&GlobalSMBSeslock); | |
1049 | return open_file; | |
1050 | } /* else might as well continue, and look for | |
1051 | another, or simply have the caller reopen it | |
1052 | again rather than trying to fix this handle */ | |
1053 | } else /* write only file */ | |
1054 | break; /* write only files are last so must be done */ | |
1055 | } | |
1056 | read_unlock(&GlobalSMBSeslock); | |
1057 | return NULL; | |
1058 | } | |
1059 | #endif | |
1060 | ||
dd99cd80 | 1061 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1062 | { |
1063 | struct cifsFileInfo *open_file; | |
dd99cd80 | 1064 | int rc; |
6148a742 | 1065 | |
60808233 SF |
1066 | /* Having a null inode here (because mapping->host was set to zero by |
1067 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1068 | it being zero) during stress testcases so we need to check for it */ | |
1069 | ||
fb8c4b14 SF |
1070 | if (cifs_inode == NULL) { |
1071 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1072 | dump_stack(); |
1073 | return NULL; | |
1074 | } | |
1075 | ||
6148a742 | 1076 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1077 | refind_writable: |
6148a742 SF |
1078 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
1079 | if (open_file->closePend) | |
1080 | continue; | |
1081 | if (open_file->pfile && | |
1082 | ((open_file->pfile->f_flags & O_RDWR) || | |
1083 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1084 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1085 | |
1086 | if (!open_file->invalidHandle) { | |
1087 | /* found a good writable file */ | |
1088 | read_unlock(&GlobalSMBSeslock); | |
1089 | return open_file; | |
1090 | } | |
8840dee9 | 1091 | |
6148a742 | 1092 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1093 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1094 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1095 | if (!rc) { |
9b22b0b7 SF |
1096 | if (!open_file->closePend) |
1097 | return open_file; | |
1098 | else { /* start over in case this was deleted */ | |
1099 | /* since the list could be modified */ | |
37c0eb46 | 1100 | read_lock(&GlobalSMBSeslock); |
15745320 | 1101 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1102 | goto refind_writable; |
37c0eb46 SF |
1103 | } |
1104 | } | |
9b22b0b7 SF |
1105 | |
1106 | /* if it fails, try another handle if possible - | |
1107 | (we can not do this if closePending since | |
1108 | loop could be modified - in which case we | |
1109 | have to start at the beginning of the list | |
1110 | again. Note that it would be bad | |
1111 | to hold up writepages here (rather than | |
1112 | in caller) with continuous retries */ | |
1113 | cFYI(1, ("wp failed on reopen file")); | |
1114 | read_lock(&GlobalSMBSeslock); | |
1115 | /* can not use this handle, no write | |
1116 | pending on this one after all */ | |
1117 | atomic_dec(&open_file->wrtPending); | |
8840dee9 | 1118 | |
9b22b0b7 SF |
1119 | if (open_file->closePend) /* list could have changed */ |
1120 | goto refind_writable; | |
1121 | /* else we simply continue to the next entry. Thus | |
1122 | we do not loop on reopen errors. If we | |
1123 | can not reopen the file, for example if we | |
1124 | reconnected to a server with another client | |
1125 | racing to delete or lock the file we would not | |
1126 | make progress if we restarted before the beginning | |
1127 | of the loop here. */ | |
6148a742 SF |
1128 | } |
1129 | } | |
1130 | read_unlock(&GlobalSMBSeslock); | |
1131 | return NULL; | |
1132 | } | |
1133 | ||
1da177e4 LT |
1134 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1135 | { | |
1136 | struct address_space *mapping = page->mapping; | |
1137 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1138 | char *write_data; | |
1139 | int rc = -EFAULT; | |
1140 | int bytes_written = 0; | |
1141 | struct cifs_sb_info *cifs_sb; | |
1142 | struct cifsTconInfo *pTcon; | |
1143 | struct inode *inode; | |
6148a742 | 1144 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1145 | |
1146 | if (!mapping || !mapping->host) | |
1147 | return -EFAULT; | |
1148 | ||
1149 | inode = page->mapping->host; | |
1150 | cifs_sb = CIFS_SB(inode->i_sb); | |
1151 | pTcon = cifs_sb->tcon; | |
1152 | ||
1153 | offset += (loff_t)from; | |
1154 | write_data = kmap(page); | |
1155 | write_data += from; | |
1156 | ||
1157 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1158 | kunmap(page); | |
1159 | return -EIO; | |
1160 | } | |
1161 | ||
1162 | /* racing with truncate? */ | |
1163 | if (offset > mapping->host->i_size) { | |
1164 | kunmap(page); | |
1165 | return 0; /* don't care */ | |
1166 | } | |
1167 | ||
1168 | /* check to make sure that we are not extending the file */ | |
1169 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1170 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1171 | |
6148a742 SF |
1172 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1173 | if (open_file) { | |
1174 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1175 | to-from, &offset); | |
23e7dd7d | 1176 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1177 | /* Does mm or vfs already set times? */ |
6148a742 | 1178 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1179 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1180 | rc = 0; |
bb5a9a04 SF |
1181 | else if (bytes_written < 0) |
1182 | rc = bytes_written; | |
6148a742 | 1183 | } else { |
1da177e4 LT |
1184 | cFYI(1, ("No writeable filehandles for inode")); |
1185 | rc = -EIO; | |
1186 | } | |
1187 | ||
1188 | kunmap(page); | |
1189 | return rc; | |
1190 | } | |
1191 | ||
1da177e4 | 1192 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1193 | struct writeback_control *wbc) |
1da177e4 | 1194 | { |
37c0eb46 SF |
1195 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1196 | unsigned int bytes_to_write; | |
1197 | unsigned int bytes_written; | |
1198 | struct cifs_sb_info *cifs_sb; | |
1199 | int done = 0; | |
111ebb6e | 1200 | pgoff_t end; |
37c0eb46 | 1201 | pgoff_t index; |
fb8c4b14 SF |
1202 | int range_whole = 0; |
1203 | struct kvec *iov; | |
84d2f07e | 1204 | int len; |
37c0eb46 SF |
1205 | int n_iov = 0; |
1206 | pgoff_t next; | |
1207 | int nr_pages; | |
1208 | __u64 offset = 0; | |
23e7dd7d | 1209 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1210 | struct page *page; |
1211 | struct pagevec pvec; | |
1212 | int rc = 0; | |
1213 | int scanned = 0; | |
1da177e4 LT |
1214 | int xid; |
1215 | ||
37c0eb46 | 1216 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1217 | |
37c0eb46 SF |
1218 | /* |
1219 | * If wsize is smaller that the page cache size, default to writing | |
1220 | * one page at a time via cifs_writepage | |
1221 | */ | |
1222 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1223 | return generic_writepages(mapping, wbc); | |
1224 | ||
fb8c4b14 SF |
1225 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1226 | if (cifs_sb->tcon->ses->server->secMode & | |
1227 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1228 | if (!experimEnabled) | |
60808233 | 1229 | return generic_writepages(mapping, wbc); |
4a77118c | 1230 | |
9a0c8230 | 1231 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1232 | if (iov == NULL) |
9a0c8230 SF |
1233 | return generic_writepages(mapping, wbc); |
1234 | ||
1235 | ||
37c0eb46 SF |
1236 | /* |
1237 | * BB: Is this meaningful for a non-block-device file system? | |
1238 | * If it is, we should test it again after we do I/O | |
1239 | */ | |
1240 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1241 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1242 | kfree(iov); |
37c0eb46 SF |
1243 | return 0; |
1244 | } | |
1245 | ||
1da177e4 LT |
1246 | xid = GetXid(); |
1247 | ||
37c0eb46 | 1248 | pagevec_init(&pvec, 0); |
111ebb6e | 1249 | if (wbc->range_cyclic) { |
37c0eb46 | 1250 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1251 | end = -1; |
1252 | } else { | |
1253 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1254 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1255 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1256 | range_whole = 1; | |
37c0eb46 SF |
1257 | scanned = 1; |
1258 | } | |
1259 | retry: | |
1260 | while (!done && (index <= end) && | |
1261 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1262 | PAGECACHE_TAG_DIRTY, | |
1263 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1264 | int first; | |
1265 | unsigned int i; | |
1266 | ||
37c0eb46 SF |
1267 | first = -1; |
1268 | next = 0; | |
1269 | n_iov = 0; | |
1270 | bytes_to_write = 0; | |
1271 | ||
1272 | for (i = 0; i < nr_pages; i++) { | |
1273 | page = pvec.pages[i]; | |
1274 | /* | |
1275 | * At this point we hold neither mapping->tree_lock nor | |
1276 | * lock on the page itself: the page may be truncated or | |
1277 | * invalidated (changing page->mapping to NULL), or even | |
1278 | * swizzled back from swapper_space to tmpfs file | |
1279 | * mapping | |
1280 | */ | |
1281 | ||
1282 | if (first < 0) | |
1283 | lock_page(page); | |
529ae9aa | 1284 | else if (!trylock_page(page)) |
37c0eb46 SF |
1285 | break; |
1286 | ||
1287 | if (unlikely(page->mapping != mapping)) { | |
1288 | unlock_page(page); | |
1289 | break; | |
1290 | } | |
1291 | ||
111ebb6e | 1292 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1293 | done = 1; |
1294 | unlock_page(page); | |
1295 | break; | |
1296 | } | |
1297 | ||
1298 | if (next && (page->index != next)) { | |
1299 | /* Not next consecutive page */ | |
1300 | unlock_page(page); | |
1301 | break; | |
1302 | } | |
1303 | ||
1304 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1305 | wait_on_page_writeback(page); | |
1306 | ||
1307 | if (PageWriteback(page) || | |
cb876f45 | 1308 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1309 | unlock_page(page); |
1310 | break; | |
1311 | } | |
84d2f07e | 1312 | |
cb876f45 LT |
1313 | /* |
1314 | * This actually clears the dirty bit in the radix tree. | |
1315 | * See cifs_writepage() for more commentary. | |
1316 | */ | |
1317 | set_page_writeback(page); | |
1318 | ||
84d2f07e SF |
1319 | if (page_offset(page) >= mapping->host->i_size) { |
1320 | done = 1; | |
1321 | unlock_page(page); | |
cb876f45 | 1322 | end_page_writeback(page); |
84d2f07e SF |
1323 | break; |
1324 | } | |
1325 | ||
37c0eb46 SF |
1326 | /* |
1327 | * BB can we get rid of this? pages are held by pvec | |
1328 | */ | |
1329 | page_cache_get(page); | |
1330 | ||
84d2f07e SF |
1331 | len = min(mapping->host->i_size - page_offset(page), |
1332 | (loff_t)PAGE_CACHE_SIZE); | |
1333 | ||
37c0eb46 SF |
1334 | /* reserve iov[0] for the smb header */ |
1335 | n_iov++; | |
1336 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1337 | iov[n_iov].iov_len = len; |
1338 | bytes_to_write += len; | |
37c0eb46 SF |
1339 | |
1340 | if (first < 0) { | |
1341 | first = i; | |
1342 | offset = page_offset(page); | |
1343 | } | |
1344 | next = page->index + 1; | |
1345 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1346 | break; | |
1347 | } | |
1348 | if (n_iov) { | |
23e7dd7d SF |
1349 | /* Search for a writable handle every time we call |
1350 | * CIFSSMBWrite2. We can't rely on the last handle | |
1351 | * we used to still be valid | |
1352 | */ | |
1353 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1354 | if (!open_file) { | |
1355 | cERROR(1, ("No writable handles for inode")); | |
1356 | rc = -EBADF; | |
1047abc1 | 1357 | } else { |
23e7dd7d SF |
1358 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1359 | open_file->netfid, | |
1360 | bytes_to_write, offset, | |
1361 | &bytes_written, iov, n_iov, | |
133672ef | 1362 | CIFS_LONG_OP); |
23e7dd7d SF |
1363 | atomic_dec(&open_file->wrtPending); |
1364 | if (rc || bytes_written < bytes_to_write) { | |
63135e08 | 1365 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1366 | rc, bytes_written)); |
1367 | /* BB what if continued retry is | |
1368 | requested via mount flags? */ | |
cea21805 JL |
1369 | if (rc == -ENOSPC) |
1370 | set_bit(AS_ENOSPC, &mapping->flags); | |
1371 | else | |
1372 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1373 | } else { |
1374 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1375 | bytes_written); | |
1376 | } | |
37c0eb46 SF |
1377 | } |
1378 | for (i = 0; i < n_iov; i++) { | |
1379 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1380 | /* Should we also set page error on |
1381 | success rc but too little data written? */ | |
1382 | /* BB investigate retry logic on temporary | |
1383 | server crash cases and how recovery works | |
fb8c4b14 SF |
1384 | when page marked as error */ |
1385 | if (rc) | |
eb9bdaa3 | 1386 | SetPageError(page); |
37c0eb46 SF |
1387 | kunmap(page); |
1388 | unlock_page(page); | |
cb876f45 | 1389 | end_page_writeback(page); |
37c0eb46 SF |
1390 | page_cache_release(page); |
1391 | } | |
1392 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1393 | done = 1; | |
1394 | index = next; | |
1395 | } | |
1396 | pagevec_release(&pvec); | |
1397 | } | |
1398 | if (!scanned && !done) { | |
1399 | /* | |
1400 | * We hit the last page and there is more work to be done: wrap | |
1401 | * back to the start of the file | |
1402 | */ | |
1403 | scanned = 1; | |
1404 | index = 0; | |
1405 | goto retry; | |
1406 | } | |
111ebb6e | 1407 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1408 | mapping->writeback_index = index; |
1409 | ||
1da177e4 | 1410 | FreeXid(xid); |
9a0c8230 | 1411 | kfree(iov); |
1da177e4 LT |
1412 | return rc; |
1413 | } | |
1da177e4 | 1414 | |
fb8c4b14 | 1415 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1416 | { |
1417 | int rc = -EFAULT; | |
1418 | int xid; | |
1419 | ||
1420 | xid = GetXid(); | |
1421 | /* BB add check for wbc flags */ | |
1422 | page_cache_get(page); | |
ad7a2926 | 1423 | if (!PageUptodate(page)) |
1da177e4 | 1424 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1425 | |
1426 | /* | |
1427 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1428 | * | |
1429 | * A writepage() implementation always needs to do either this, | |
1430 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1431 | * the case of a failure. | |
1432 | * | |
1433 | * Just unlocking the page will cause the radix tree tag-bits | |
1434 | * to fail to update with the state of the page correctly. | |
1435 | */ | |
fb8c4b14 | 1436 | set_page_writeback(page); |
1da177e4 LT |
1437 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1438 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1439 | unlock_page(page); | |
cb876f45 LT |
1440 | end_page_writeback(page); |
1441 | page_cache_release(page); | |
1da177e4 LT |
1442 | FreeXid(xid); |
1443 | return rc; | |
1444 | } | |
1445 | ||
1446 | static int cifs_commit_write(struct file *file, struct page *page, | |
1447 | unsigned offset, unsigned to) | |
1448 | { | |
1449 | int xid; | |
1450 | int rc = 0; | |
1451 | struct inode *inode = page->mapping->host; | |
1452 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1453 | char *page_data; | |
1454 | ||
1455 | xid = GetXid(); | |
fb8c4b14 | 1456 | cFYI(1, ("commit write for page %p up to position %lld for %d", |
1da177e4 | 1457 | page, position, to)); |
3677db10 | 1458 | spin_lock(&inode->i_lock); |
ad7a2926 | 1459 | if (position > inode->i_size) |
1da177e4 | 1460 | i_size_write(inode, position); |
ad7a2926 | 1461 | |
3677db10 | 1462 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
1463 | if (!PageUptodate(page)) { |
1464 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1465 | /* can not rely on (or let) writepage write this data */ | |
1466 | if (to < offset) { | |
1467 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1468 | offset, to)); | |
1469 | FreeXid(xid); | |
1470 | return rc; | |
1471 | } | |
1472 | /* this is probably better than directly calling | |
1473 | partialpage_write since in this function the file handle is | |
1474 | known which we might as well leverage */ | |
1475 | /* BB check if anything else missing out of ppw | |
1476 | such as updating last write time */ | |
1477 | page_data = kmap(page); | |
1478 | rc = cifs_write(file, page_data + offset, to-offset, | |
1479 | &position); | |
1480 | if (rc > 0) | |
1481 | rc = 0; | |
1482 | /* else if (rc < 0) should we set writebehind rc? */ | |
1483 | kunmap(page); | |
fb8c4b14 | 1484 | } else { |
1da177e4 LT |
1485 | set_page_dirty(page); |
1486 | } | |
1487 | ||
1488 | FreeXid(xid); | |
1489 | return rc; | |
1490 | } | |
1491 | ||
1492 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1493 | { | |
1494 | int xid; | |
1495 | int rc = 0; | |
e6a00296 | 1496 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1497 | |
1498 | xid = GetXid(); | |
1499 | ||
fb8c4b14 | 1500 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1501 | dentry->d_name.name, datasync)); |
50c2f753 | 1502 | |
cea21805 JL |
1503 | rc = filemap_write_and_wait(inode->i_mapping); |
1504 | if (rc == 0) { | |
1505 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1506 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1507 | } |
1da177e4 LT |
1508 | FreeXid(xid); |
1509 | return rc; | |
1510 | } | |
1511 | ||
3978d717 | 1512 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1513 | { |
1514 | struct address_space *mapping; | |
1515 | struct inode *inode; | |
1516 | unsigned long index = page->index; | |
1517 | unsigned int rpages = 0; | |
1518 | int rc = 0; | |
1519 | ||
1520 | cFYI(1, ("sync page %p",page)); | |
1521 | mapping = page->mapping; | |
1522 | if (!mapping) | |
1523 | return 0; | |
1524 | inode = mapping->host; | |
1525 | if (!inode) | |
3978d717 | 1526 | return; */ |
1da177e4 | 1527 | |
fb8c4b14 | 1528 | /* fill in rpages then |
1da177e4 LT |
1529 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1530 | ||
26a21b98 | 1531 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1532 | |
3978d717 | 1533 | #if 0 |
1da177e4 LT |
1534 | if (rc < 0) |
1535 | return rc; | |
1536 | return 0; | |
3978d717 | 1537 | #endif |
1da177e4 LT |
1538 | } */ |
1539 | ||
1540 | /* | |
1541 | * As file closes, flush all cached write data for this inode checking | |
1542 | * for write behind errors. | |
1543 | */ | |
75e1fcc0 | 1544 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1545 | { |
fb8c4b14 | 1546 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1547 | int rc = 0; |
1548 | ||
1549 | /* Rather than do the steps manually: | |
1550 | lock the inode for writing | |
1551 | loop through pages looking for write behind data (dirty pages) | |
1552 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1553 | send to server (prefer in parallel) | |
1554 | deal with writebehind errors | |
1555 | unlock inode for writing | |
1556 | filemapfdatawrite appears easier for the time being */ | |
1557 | ||
1558 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1559 | /* reset wb rc if we were able to write out dirty pages */ |
1560 | if (!rc) { | |
1561 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1562 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1563 | } |
50c2f753 | 1564 | |
fb8c4b14 | 1565 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1566 | |
1567 | return rc; | |
1568 | } | |
1569 | ||
1570 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1571 | size_t read_size, loff_t *poffset) | |
1572 | { | |
1573 | int rc = -EACCES; | |
1574 | unsigned int bytes_read = 0; | |
1575 | unsigned int total_read = 0; | |
1576 | unsigned int current_read_size; | |
1577 | struct cifs_sb_info *cifs_sb; | |
1578 | struct cifsTconInfo *pTcon; | |
1579 | int xid; | |
1580 | struct cifsFileInfo *open_file; | |
1581 | char *smb_read_data; | |
1582 | char __user *current_offset; | |
1583 | struct smb_com_read_rsp *pSMBr; | |
1584 | ||
1585 | xid = GetXid(); | |
e6a00296 | 1586 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1587 | pTcon = cifs_sb->tcon; |
1588 | ||
1589 | if (file->private_data == NULL) { | |
1590 | FreeXid(xid); | |
1591 | return -EBADF; | |
1592 | } | |
1593 | open_file = (struct cifsFileInfo *)file->private_data; | |
1594 | ||
ad7a2926 | 1595 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1596 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1597 | |
1da177e4 LT |
1598 | for (total_read = 0, current_offset = read_data; |
1599 | read_size > total_read; | |
1600 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1601 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1602 | cifs_sb->rsize); |
1603 | rc = -EAGAIN; | |
1604 | smb_read_data = NULL; | |
1605 | while (rc == -EAGAIN) { | |
ec637e3f | 1606 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1607 | if ((open_file->invalidHandle) && |
1da177e4 | 1608 | (!open_file->closePend)) { |
4b18f2a9 | 1609 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1610 | if (rc != 0) |
1611 | break; | |
1612 | } | |
bfa0d75a | 1613 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1614 | open_file->netfid, |
1615 | current_read_size, *poffset, | |
1616 | &bytes_read, &smb_read_data, | |
1617 | &buf_type); | |
1da177e4 | 1618 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1619 | if (smb_read_data) { |
93544cc6 SF |
1620 | if (copy_to_user(current_offset, |
1621 | smb_read_data + | |
1622 | 4 /* RFC1001 length field */ + | |
1623 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1624 | bytes_read)) |
93544cc6 | 1625 | rc = -EFAULT; |
93544cc6 | 1626 | |
fb8c4b14 | 1627 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1628 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1629 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1630 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1631 | smb_read_data = NULL; |
1632 | } | |
1633 | } | |
1634 | if (rc || (bytes_read == 0)) { | |
1635 | if (total_read) { | |
1636 | break; | |
1637 | } else { | |
1638 | FreeXid(xid); | |
1639 | return rc; | |
1640 | } | |
1641 | } else { | |
a4544347 | 1642 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1643 | *poffset += bytes_read; |
1644 | } | |
1645 | } | |
1646 | FreeXid(xid); | |
1647 | return total_read; | |
1648 | } | |
1649 | ||
1650 | ||
1651 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1652 | loff_t *poffset) | |
1653 | { | |
1654 | int rc = -EACCES; | |
1655 | unsigned int bytes_read = 0; | |
1656 | unsigned int total_read; | |
1657 | unsigned int current_read_size; | |
1658 | struct cifs_sb_info *cifs_sb; | |
1659 | struct cifsTconInfo *pTcon; | |
1660 | int xid; | |
1661 | char *current_offset; | |
1662 | struct cifsFileInfo *open_file; | |
ec637e3f | 1663 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1664 | |
1665 | xid = GetXid(); | |
e6a00296 | 1666 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1667 | pTcon = cifs_sb->tcon; |
1668 | ||
1669 | if (file->private_data == NULL) { | |
1670 | FreeXid(xid); | |
1671 | return -EBADF; | |
1672 | } | |
1673 | open_file = (struct cifsFileInfo *)file->private_data; | |
1674 | ||
1675 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1676 | cFYI(1, ("attempting read on write only file instance")); | |
1677 | ||
fb8c4b14 | 1678 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1679 | read_size > total_read; |
1680 | total_read += bytes_read, current_offset += bytes_read) { | |
1681 | current_read_size = min_t(const int, read_size - total_read, | |
1682 | cifs_sb->rsize); | |
f9f5c817 SF |
1683 | /* For windows me and 9x we do not want to request more |
1684 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1685 | if ((pTcon->ses) && |
f9f5c817 SF |
1686 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1687 | current_read_size = min_t(const int, current_read_size, | |
1688 | pTcon->ses->server->maxBuf - 128); | |
1689 | } | |
1da177e4 LT |
1690 | rc = -EAGAIN; |
1691 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1692 | if ((open_file->invalidHandle) && |
1da177e4 | 1693 | (!open_file->closePend)) { |
4b18f2a9 | 1694 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1695 | if (rc != 0) |
1696 | break; | |
1697 | } | |
bfa0d75a | 1698 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1699 | open_file->netfid, |
1700 | current_read_size, *poffset, | |
1701 | &bytes_read, ¤t_offset, | |
1702 | &buf_type); | |
1da177e4 LT |
1703 | } |
1704 | if (rc || (bytes_read == 0)) { | |
1705 | if (total_read) { | |
1706 | break; | |
1707 | } else { | |
1708 | FreeXid(xid); | |
1709 | return rc; | |
1710 | } | |
1711 | } else { | |
a4544347 | 1712 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1713 | *poffset += bytes_read; |
1714 | } | |
1715 | } | |
1716 | FreeXid(xid); | |
1717 | return total_read; | |
1718 | } | |
1719 | ||
1720 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1721 | { | |
e6a00296 | 1722 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1723 | int rc, xid; |
1724 | ||
1725 | xid = GetXid(); | |
1726 | rc = cifs_revalidate(dentry); | |
1727 | if (rc) { | |
1728 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1729 | FreeXid(xid); | |
1730 | return rc; | |
1731 | } | |
1732 | rc = generic_file_mmap(file, vma); | |
1733 | FreeXid(xid); | |
1734 | return rc; | |
1735 | } | |
1736 | ||
1737 | ||
fb8c4b14 | 1738 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1739 | struct list_head *pages, int bytes_read, char *data, |
1740 | struct pagevec *plru_pvec) | |
1741 | { | |
1742 | struct page *page; | |
1743 | char *target; | |
1744 | ||
1745 | while (bytes_read > 0) { | |
1746 | if (list_empty(pages)) | |
1747 | break; | |
1748 | ||
1749 | page = list_entry(pages->prev, struct page, lru); | |
1750 | list_del(&page->lru); | |
1751 | ||
1752 | if (add_to_page_cache(page, mapping, page->index, | |
1753 | GFP_KERNEL)) { | |
1754 | page_cache_release(page); | |
1755 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1756 | data += PAGE_CACHE_SIZE; |
1757 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1758 | continue; |
1759 | } | |
1760 | ||
fb8c4b14 | 1761 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1762 | |
1763 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1764 | memcpy(target, data, bytes_read); | |
1765 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1766 | memset(target + bytes_read, 0, |
1da177e4 LT |
1767 | PAGE_CACHE_SIZE - bytes_read); |
1768 | bytes_read = 0; | |
1769 | } else { | |
1770 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1771 | bytes_read -= PAGE_CACHE_SIZE; | |
1772 | } | |
1773 | kunmap_atomic(target, KM_USER0); | |
1774 | ||
1775 | flush_dcache_page(page); | |
1776 | SetPageUptodate(page); | |
1777 | unlock_page(page); | |
1778 | if (!pagevec_add(plru_pvec, page)) | |
1779 | __pagevec_lru_add(plru_pvec); | |
1780 | data += PAGE_CACHE_SIZE; | |
1781 | } | |
1782 | return; | |
1783 | } | |
1784 | ||
1785 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1786 | struct list_head *page_list, unsigned num_pages) | |
1787 | { | |
1788 | int rc = -EACCES; | |
1789 | int xid; | |
1790 | loff_t offset; | |
1791 | struct page *page; | |
1792 | struct cifs_sb_info *cifs_sb; | |
1793 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1794 | unsigned int bytes_read = 0; |
fb8c4b14 | 1795 | unsigned int read_size, i; |
1da177e4 LT |
1796 | char *smb_read_data = NULL; |
1797 | struct smb_com_read_rsp *pSMBr; | |
1798 | struct pagevec lru_pvec; | |
1799 | struct cifsFileInfo *open_file; | |
ec637e3f | 1800 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1801 | |
1802 | xid = GetXid(); | |
1803 | if (file->private_data == NULL) { | |
1804 | FreeXid(xid); | |
1805 | return -EBADF; | |
1806 | } | |
1807 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1808 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1809 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1810 | |
1da177e4 | 1811 | pagevec_init(&lru_pvec, 0); |
90c81e0b | 1812 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
1813 | for (i = 0; i < num_pages; ) { |
1814 | unsigned contig_pages; | |
1815 | struct page *tmp_page; | |
1816 | unsigned long expected_index; | |
1817 | ||
1818 | if (list_empty(page_list)) | |
1819 | break; | |
1820 | ||
1821 | page = list_entry(page_list->prev, struct page, lru); | |
1822 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1823 | ||
1824 | /* count adjacent pages that we will read into */ | |
1825 | contig_pages = 0; | |
fb8c4b14 | 1826 | expected_index = |
1da177e4 | 1827 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1828 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1829 | if (tmp_page->index == expected_index) { |
1830 | contig_pages++; | |
1831 | expected_index++; | |
1832 | } else | |
fb8c4b14 | 1833 | break; |
1da177e4 LT |
1834 | } |
1835 | if (contig_pages + i > num_pages) | |
1836 | contig_pages = num_pages - i; | |
1837 | ||
1838 | /* for reads over a certain size could initiate async | |
1839 | read ahead */ | |
1840 | ||
1841 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1842 | /* Read size needs to be in multiples of one page */ | |
1843 | read_size = min_t(const unsigned int, read_size, | |
1844 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 1845 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 1846 | read_size, contig_pages)); |
1da177e4 LT |
1847 | rc = -EAGAIN; |
1848 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1849 | if ((open_file->invalidHandle) && |
1da177e4 | 1850 | (!open_file->closePend)) { |
4b18f2a9 | 1851 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1852 | if (rc != 0) |
1853 | break; | |
1854 | } | |
1855 | ||
bfa0d75a | 1856 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1857 | open_file->netfid, |
1858 | read_size, offset, | |
1859 | &bytes_read, &smb_read_data, | |
1860 | &buf_type); | |
a9d02ad4 | 1861 | /* BB more RC checks ? */ |
fb8c4b14 | 1862 | if (rc == -EAGAIN) { |
1da177e4 | 1863 | if (smb_read_data) { |
fb8c4b14 | 1864 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1865 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1866 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1867 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1868 | smb_read_data = NULL; |
1869 | } | |
1870 | } | |
1871 | } | |
1872 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1873 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1874 | break; |
1875 | } else if (bytes_read > 0) { | |
6f88cc2e | 1876 | task_io_account_read(bytes_read); |
1da177e4 LT |
1877 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1878 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1879 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1880 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1881 | ||
1882 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1883 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1884 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1885 | i++; /* account for partial page */ |
1886 | ||
fb8c4b14 | 1887 | /* server copy of file can have smaller size |
1da177e4 | 1888 | than client */ |
fb8c4b14 SF |
1889 | /* BB do we need to verify this common case ? |
1890 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1891 | we will hit it on next read */ |
1892 | ||
05ac9d4b | 1893 | /* break; */ |
1da177e4 LT |
1894 | } |
1895 | } else { | |
1896 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1897 | "Cleaning remaining pages from readahead list", | |
1898 | bytes_read, offset)); | |
fb8c4b14 | 1899 | /* BB turn off caching and do new lookup on |
1da177e4 | 1900 | file size at server? */ |
1da177e4 LT |
1901 | break; |
1902 | } | |
1903 | if (smb_read_data) { | |
fb8c4b14 | 1904 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1905 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1906 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1907 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1908 | smb_read_data = NULL; |
1909 | } | |
1910 | bytes_read = 0; | |
1911 | } | |
1912 | ||
1913 | pagevec_lru_add(&lru_pvec); | |
1914 | ||
1915 | /* need to free smb_read_data buf before exit */ | |
1916 | if (smb_read_data) { | |
fb8c4b14 | 1917 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1918 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1919 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1920 | cifs_buf_release(smb_read_data); |
1da177e4 | 1921 | smb_read_data = NULL; |
fb8c4b14 | 1922 | } |
1da177e4 LT |
1923 | |
1924 | FreeXid(xid); | |
1925 | return rc; | |
1926 | } | |
1927 | ||
1928 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1929 | loff_t *poffset) | |
1930 | { | |
1931 | char *read_data; | |
1932 | int rc; | |
1933 | ||
1934 | page_cache_get(page); | |
1935 | read_data = kmap(page); | |
1936 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1937 | |
1da177e4 | 1938 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1939 | |
1da177e4 LT |
1940 | if (rc < 0) |
1941 | goto io_error; | |
1942 | else | |
fb8c4b14 SF |
1943 | cFYI(1, ("Bytes read %d", rc)); |
1944 | ||
e6a00296 JJS |
1945 | file->f_path.dentry->d_inode->i_atime = |
1946 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1947 | |
1da177e4 LT |
1948 | if (PAGE_CACHE_SIZE > rc) |
1949 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1950 | ||
1951 | flush_dcache_page(page); | |
1952 | SetPageUptodate(page); | |
1953 | rc = 0; | |
fb8c4b14 | 1954 | |
1da177e4 | 1955 | io_error: |
fb8c4b14 | 1956 | kunmap(page); |
1da177e4 LT |
1957 | page_cache_release(page); |
1958 | return rc; | |
1959 | } | |
1960 | ||
1961 | static int cifs_readpage(struct file *file, struct page *page) | |
1962 | { | |
1963 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1964 | int rc = -EACCES; | |
1965 | int xid; | |
1966 | ||
1967 | xid = GetXid(); | |
1968 | ||
1969 | if (file->private_data == NULL) { | |
1970 | FreeXid(xid); | |
1971 | return -EBADF; | |
1972 | } | |
1973 | ||
fb8c4b14 | 1974 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
1975 | page, (int)offset, (int)offset)); |
1976 | ||
1977 | rc = cifs_readpage_worker(file, page, &offset); | |
1978 | ||
1979 | unlock_page(page); | |
1980 | ||
1981 | FreeXid(xid); | |
1982 | return rc; | |
1983 | } | |
1984 | ||
a403a0a3 SF |
1985 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
1986 | { | |
1987 | struct cifsFileInfo *open_file; | |
1988 | ||
1989 | read_lock(&GlobalSMBSeslock); | |
1990 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1991 | if (open_file->closePend) | |
1992 | continue; | |
1993 | if (open_file->pfile && | |
1994 | ((open_file->pfile->f_flags & O_RDWR) || | |
1995 | (open_file->pfile->f_flags & O_WRONLY))) { | |
1996 | read_unlock(&GlobalSMBSeslock); | |
1997 | return 1; | |
1998 | } | |
1999 | } | |
2000 | read_unlock(&GlobalSMBSeslock); | |
2001 | return 0; | |
2002 | } | |
2003 | ||
1da177e4 LT |
2004 | /* We do not want to update the file size from server for inodes |
2005 | open for write - to avoid races with writepage extending | |
2006 | the file - in the future we could consider allowing | |
fb8c4b14 | 2007 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2008 | but this is tricky to do without racing with writebehind |
2009 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2010 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2011 | { |
a403a0a3 | 2012 | if (!cifsInode) |
4b18f2a9 | 2013 | return true; |
50c2f753 | 2014 | |
a403a0a3 SF |
2015 | if (is_inode_writable(cifsInode)) { |
2016 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2017 | struct cifs_sb_info *cifs_sb; |
2018 | ||
c32a0b68 | 2019 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2020 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2021 | /* since no page cache to corrupt on directio |
c32a0b68 | 2022 | we can change size safely */ |
4b18f2a9 | 2023 | return true; |
c32a0b68 SF |
2024 | } |
2025 | ||
fb8c4b14 | 2026 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2027 | return true; |
7ba52631 | 2028 | |
4b18f2a9 | 2029 | return false; |
23e7dd7d | 2030 | } else |
4b18f2a9 | 2031 | return true; |
1da177e4 LT |
2032 | } |
2033 | ||
1da177e4 LT |
2034 | static int cifs_prepare_write(struct file *file, struct page *page, |
2035 | unsigned from, unsigned to) | |
2036 | { | |
2037 | int rc = 0; | |
8a236264 SF |
2038 | loff_t i_size; |
2039 | loff_t offset; | |
2040 | ||
fb8c4b14 | 2041 | cFYI(1, ("prepare write for page %p from %d to %d", page, from, to)); |
8a236264 SF |
2042 | if (PageUptodate(page)) |
2043 | return 0; | |
2044 | ||
2045 | /* If we are writing a full page it will be up to date, | |
2046 | no need to read from the server */ | |
2047 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { | |
2048 | SetPageUptodate(page); | |
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2053 | i_size = i_size_read(page->mapping->host); | |
2054 | ||
2055 | if ((offset >= i_size) || | |
2056 | ((from == 0) && (offset + to) >= i_size)) { | |
2057 | /* | |
2058 | * We don't need to read data beyond the end of the file. | |
2059 | * zero it, and set the page uptodate | |
2060 | */ | |
8803863a | 2061 | simple_prepare_write(file, page, from, to); |
8a236264 SF |
2062 | SetPageUptodate(page); |
2063 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1da177e4 | 2064 | /* might as well read a page, it is fast enough */ |
8a236264 SF |
2065 | rc = cifs_readpage_worker(file, page, &offset); |
2066 | } else { | |
2067 | /* we could try using another file handle if there is one - | |
2068 | but how would we lock it to prevent close of that handle | |
2069 | racing with this read? In any case | |
2070 | this will be written out by commit_write so is fine */ | |
1da177e4 LT |
2071 | } |
2072 | ||
fb8c4b14 SF |
2073 | /* we do not need to pass errors back |
2074 | e.g. if we do not have read access to the file | |
8a236264 SF |
2075 | because cifs_commit_write will do the right thing. -- shaggy */ |
2076 | ||
1da177e4 LT |
2077 | return 0; |
2078 | } | |
2079 | ||
f5e54d6e | 2080 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2081 | .readpage = cifs_readpage, |
2082 | .readpages = cifs_readpages, | |
2083 | .writepage = cifs_writepage, | |
37c0eb46 | 2084 | .writepages = cifs_writepages, |
1da177e4 LT |
2085 | .prepare_write = cifs_prepare_write, |
2086 | .commit_write = cifs_commit_write, | |
2087 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2088 | /* .sync_page = cifs_sync_page, */ | |
2089 | /* .direct_IO = */ | |
2090 | }; | |
273d81d6 DK |
2091 | |
2092 | /* | |
2093 | * cifs_readpages requires the server to support a buffer large enough to | |
2094 | * contain the header plus one complete page of data. Otherwise, we need | |
2095 | * to leave cifs_readpages out of the address space operations. | |
2096 | */ | |
f5e54d6e | 2097 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2098 | .readpage = cifs_readpage, |
2099 | .writepage = cifs_writepage, | |
2100 | .writepages = cifs_writepages, | |
2101 | .prepare_write = cifs_prepare_write, | |
2102 | .commit_write = cifs_commit_write, | |
2103 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2104 | /* .sync_page = cifs_sync_page, */ | |
2105 | /* .direct_IO = */ | |
2106 | }; |