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1 | /* | |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
5 | * | |
6 | * Copyright (C) International Business Machines Corp., 2002,2010 | |
7 | * Author(s): Steve French (sfrench@us.ibm.com) | |
8 | * Jeremy Allison (jra@samba.org) | |
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> | |
25 | #include <linux/backing-dev.h> | |
26 | #include <linux/stat.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/task_io_accounting_ops.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/slab.h> | |
35 | #include <asm/div64.h> | |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
43 | #include "fscache.h" | |
44 | ||
45 | static inline int cifs_convert_flags(unsigned int flags) | |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
61 | } | |
62 | ||
63 | static u32 cifs_posix_convert_flags(unsigned int flags) | |
64 | { | |
65 | u32 posix_flags = 0; | |
66 | ||
67 | if ((flags & O_ACCMODE) == O_RDONLY) | |
68 | posix_flags = SMB_O_RDONLY; | |
69 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
70 | posix_flags = SMB_O_WRONLY; | |
71 | else if ((flags & O_ACCMODE) == O_RDWR) | |
72 | posix_flags = SMB_O_RDWR; | |
73 | ||
74 | if (flags & O_CREAT) | |
75 | posix_flags |= SMB_O_CREAT; | |
76 | if (flags & O_EXCL) | |
77 | posix_flags |= SMB_O_EXCL; | |
78 | if (flags & O_TRUNC) | |
79 | posix_flags |= SMB_O_TRUNC; | |
80 | /* be safe and imply O_SYNC for O_DSYNC */ | |
81 | if (flags & O_DSYNC) | |
82 | posix_flags |= SMB_O_SYNC; | |
83 | if (flags & O_DIRECTORY) | |
84 | posix_flags |= SMB_O_DIRECTORY; | |
85 | if (flags & O_NOFOLLOW) | |
86 | posix_flags |= SMB_O_NOFOLLOW; | |
87 | if (flags & O_DIRECT) | |
88 | posix_flags |= SMB_O_DIRECT; | |
89 | ||
90 | return posix_flags; | |
91 | } | |
92 | ||
93 | static inline int cifs_get_disposition(unsigned int flags) | |
94 | { | |
95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
96 | return FILE_CREATE; | |
97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
98 | return FILE_OVERWRITE_IF; | |
99 | else if ((flags & O_CREAT) == O_CREAT) | |
100 | return FILE_OPEN_IF; | |
101 | else if ((flags & O_TRUNC) == O_TRUNC) | |
102 | return FILE_OVERWRITE; | |
103 | else | |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
107 | static inline int cifs_open_inode_helper(struct inode *inode, | |
108 | struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf, | |
109 | char *full_path, int xid) | |
110 | { | |
111 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
112 | struct timespec temp; | |
113 | int rc; | |
114 | ||
115 | if (pCifsInode->clientCanCacheRead) { | |
116 | /* we have the inode open somewhere else | |
117 | no need to discard cache data */ | |
118 | goto client_can_cache; | |
119 | } | |
120 | ||
121 | /* BB need same check in cifs_create too? */ | |
122 | /* if not oplocked, invalidate inode pages if mtime or file | |
123 | size changed */ | |
124 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); | |
125 | if (timespec_equal(&inode->i_mtime, &temp) && | |
126 | (inode->i_size == | |
127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
128 | cFYI(1, "inode unchanged on server"); | |
129 | } else { | |
130 | if (inode->i_mapping) { | |
131 | /* BB no need to lock inode until after invalidate | |
132 | since namei code should already have it locked? */ | |
133 | rc = filemap_write_and_wait(inode->i_mapping); | |
134 | mapping_set_error(inode->i_mapping, rc); | |
135 | } | |
136 | cFYI(1, "invalidating remote inode since open detected it " | |
137 | "changed"); | |
138 | invalidate_remote_inode(inode); | |
139 | } | |
140 | ||
141 | client_can_cache: | |
142 | if (pTcon->unix_ext) | |
143 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
144 | xid); | |
145 | else | |
146 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
147 | xid, NULL); | |
148 | ||
149 | cifs_set_oplock_level(inode, oplock); | |
150 | ||
151 | return rc; | |
152 | } | |
153 | ||
154 | int cifs_posix_open(char *full_path, struct inode **pinode, | |
155 | struct super_block *sb, int mode, unsigned int f_flags, | |
156 | __u32 *poplock, __u16 *pnetfid, int xid) | |
157 | { | |
158 | int rc; | |
159 | FILE_UNIX_BASIC_INFO *presp_data; | |
160 | __u32 posix_flags = 0; | |
161 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
162 | struct cifs_fattr fattr; | |
163 | struct tcon_link *tlink; | |
164 | struct cifsTconInfo *tcon; | |
165 | ||
166 | cFYI(1, "posix open %s", full_path); | |
167 | ||
168 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
169 | if (presp_data == NULL) | |
170 | return -ENOMEM; | |
171 | ||
172 | tlink = cifs_sb_tlink(cifs_sb); | |
173 | if (IS_ERR(tlink)) { | |
174 | rc = PTR_ERR(tlink); | |
175 | goto posix_open_ret; | |
176 | } | |
177 | ||
178 | tcon = tlink_tcon(tlink); | |
179 | mode &= ~current_umask(); | |
180 | ||
181 | posix_flags = cifs_posix_convert_flags(f_flags); | |
182 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
183 | poplock, full_path, cifs_sb->local_nls, | |
184 | cifs_sb->mnt_cifs_flags & | |
185 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
186 | cifs_put_tlink(tlink); | |
187 | ||
188 | if (rc) | |
189 | goto posix_open_ret; | |
190 | ||
191 | if (presp_data->Type == cpu_to_le32(-1)) | |
192 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
193 | ||
194 | if (!pinode) | |
195 | goto posix_open_ret; /* caller does not need info */ | |
196 | ||
197 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
198 | ||
199 | /* get new inode and set it up */ | |
200 | if (*pinode == NULL) { | |
201 | cifs_fill_uniqueid(sb, &fattr); | |
202 | *pinode = cifs_iget(sb, &fattr); | |
203 | if (!*pinode) { | |
204 | rc = -ENOMEM; | |
205 | goto posix_open_ret; | |
206 | } | |
207 | } else { | |
208 | cifs_fattr_to_inode(*pinode, &fattr); | |
209 | } | |
210 | ||
211 | posix_open_ret: | |
212 | kfree(presp_data); | |
213 | return rc; | |
214 | } | |
215 | ||
216 | struct cifsFileInfo * | |
217 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
218 | struct tcon_link *tlink, __u32 oplock) | |
219 | { | |
220 | struct dentry *dentry = file->f_path.dentry; | |
221 | struct inode *inode = dentry->d_inode; | |
222 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
223 | struct cifsFileInfo *pCifsFile; | |
224 | ||
225 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
226 | if (pCifsFile == NULL) | |
227 | return pCifsFile; | |
228 | ||
229 | pCifsFile->count = 1; | |
230 | pCifsFile->netfid = fileHandle; | |
231 | pCifsFile->pid = current->tgid; | |
232 | pCifsFile->uid = current_fsuid(); | |
233 | pCifsFile->dentry = dget(dentry); | |
234 | pCifsFile->f_flags = file->f_flags; | |
235 | pCifsFile->invalidHandle = false; | |
236 | pCifsFile->tlink = cifs_get_tlink(tlink); | |
237 | mutex_init(&pCifsFile->fh_mutex); | |
238 | mutex_init(&pCifsFile->lock_mutex); | |
239 | INIT_LIST_HEAD(&pCifsFile->llist); | |
240 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); | |
241 | ||
242 | spin_lock(&cifs_file_list_lock); | |
243 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); | |
244 | /* if readable file instance put first in list*/ | |
245 | if (file->f_mode & FMODE_READ) | |
246 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
247 | else | |
248 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
249 | spin_unlock(&cifs_file_list_lock); | |
250 | ||
251 | cifs_set_oplock_level(inode, oplock); | |
252 | ||
253 | file->private_data = pCifsFile; | |
254 | return pCifsFile; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Release a reference on the file private data. This may involve closing | |
259 | * the filehandle out on the server. Must be called without holding | |
260 | * cifs_file_list_lock. | |
261 | */ | |
262 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) | |
263 | { | |
264 | struct inode *inode = cifs_file->dentry->d_inode; | |
265 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); | |
266 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
267 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
268 | struct cifsLockInfo *li, *tmp; | |
269 | ||
270 | spin_lock(&cifs_file_list_lock); | |
271 | if (--cifs_file->count > 0) { | |
272 | spin_unlock(&cifs_file_list_lock); | |
273 | return; | |
274 | } | |
275 | ||
276 | /* remove it from the lists */ | |
277 | list_del(&cifs_file->flist); | |
278 | list_del(&cifs_file->tlist); | |
279 | ||
280 | if (list_empty(&cifsi->openFileList)) { | |
281 | cFYI(1, "closing last open instance for inode %p", | |
282 | cifs_file->dentry->d_inode); | |
283 | cifs_set_oplock_level(inode, 0); | |
284 | } | |
285 | spin_unlock(&cifs_file_list_lock); | |
286 | ||
287 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { | |
288 | int xid, rc; | |
289 | ||
290 | xid = GetXid(); | |
291 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
292 | FreeXid(xid); | |
293 | } | |
294 | ||
295 | /* Delete any outstanding lock records. We'll lose them when the file | |
296 | * is closed anyway. | |
297 | */ | |
298 | mutex_lock(&cifs_file->lock_mutex); | |
299 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { | |
300 | list_del(&li->llist); | |
301 | kfree(li); | |
302 | } | |
303 | mutex_unlock(&cifs_file->lock_mutex); | |
304 | ||
305 | cifs_put_tlink(cifs_file->tlink); | |
306 | dput(cifs_file->dentry); | |
307 | kfree(cifs_file); | |
308 | } | |
309 | ||
310 | int cifs_open(struct inode *inode, struct file *file) | |
311 | { | |
312 | int rc = -EACCES; | |
313 | int xid; | |
314 | __u32 oplock; | |
315 | struct cifs_sb_info *cifs_sb; | |
316 | struct cifsTconInfo *tcon; | |
317 | struct tcon_link *tlink; | |
318 | struct cifsFileInfo *pCifsFile = NULL; | |
319 | struct cifsInodeInfo *pCifsInode; | |
320 | char *full_path = NULL; | |
321 | int desiredAccess; | |
322 | int disposition; | |
323 | __u16 netfid; | |
324 | FILE_ALL_INFO *buf = NULL; | |
325 | ||
326 | xid = GetXid(); | |
327 | ||
328 | cifs_sb = CIFS_SB(inode->i_sb); | |
329 | tlink = cifs_sb_tlink(cifs_sb); | |
330 | if (IS_ERR(tlink)) { | |
331 | FreeXid(xid); | |
332 | return PTR_ERR(tlink); | |
333 | } | |
334 | tcon = tlink_tcon(tlink); | |
335 | ||
336 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
337 | ||
338 | full_path = build_path_from_dentry(file->f_path.dentry); | |
339 | if (full_path == NULL) { | |
340 | rc = -ENOMEM; | |
341 | goto out; | |
342 | } | |
343 | ||
344 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", | |
345 | inode, file->f_flags, full_path); | |
346 | ||
347 | if (oplockEnabled) | |
348 | oplock = REQ_OPLOCK; | |
349 | else | |
350 | oplock = 0; | |
351 | ||
352 | if (!tcon->broken_posix_open && tcon->unix_ext && | |
353 | (tcon->ses->capabilities & CAP_UNIX) && | |
354 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
355 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
356 | /* can not refresh inode info since size could be stale */ | |
357 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, | |
358 | cifs_sb->mnt_file_mode /* ignored */, | |
359 | file->f_flags, &oplock, &netfid, xid); | |
360 | if (rc == 0) { | |
361 | cFYI(1, "posix open succeeded"); | |
362 | ||
363 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, | |
364 | oplock); | |
365 | if (pCifsFile == NULL) { | |
366 | CIFSSMBClose(xid, tcon, netfid); | |
367 | rc = -ENOMEM; | |
368 | } | |
369 | ||
370 | cifs_fscache_set_inode_cookie(inode, file); | |
371 | ||
372 | goto out; | |
373 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { | |
374 | if (tcon->ses->serverNOS) | |
375 | cERROR(1, "server %s of type %s returned" | |
376 | " unexpected error on SMB posix open" | |
377 | ", disabling posix open support." | |
378 | " Check if server update available.", | |
379 | tcon->ses->serverName, | |
380 | tcon->ses->serverNOS); | |
381 | tcon->broken_posix_open = true; | |
382 | } else if ((rc != -EIO) && (rc != -EREMOTE) && | |
383 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
384 | goto out; | |
385 | /* else fallthrough to retry open the old way on network i/o | |
386 | or DFS errors */ | |
387 | } | |
388 | ||
389 | desiredAccess = cifs_convert_flags(file->f_flags); | |
390 | ||
391 | /********************************************************************* | |
392 | * open flag mapping table: | |
393 | * | |
394 | * POSIX Flag CIFS Disposition | |
395 | * ---------- ---------------- | |
396 | * O_CREAT FILE_OPEN_IF | |
397 | * O_CREAT | O_EXCL FILE_CREATE | |
398 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
399 | * O_TRUNC FILE_OVERWRITE | |
400 | * none of the above FILE_OPEN | |
401 | * | |
402 | * Note that there is not a direct match between disposition | |
403 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
404 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
405 | * file rather than creating a new file as FILE_SUPERSEDE does | |
406 | * (which uses the attributes / metadata passed in on open call) | |
407 | *? | |
408 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
409 | *? and the read write flags match reasonably. O_LARGEFILE | |
410 | *? is irrelevant because largefile support is always used | |
411 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
412 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
413 | *********************************************************************/ | |
414 | ||
415 | disposition = cifs_get_disposition(file->f_flags); | |
416 | ||
417 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
418 | ||
419 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
420 | and calling get_inode_info with returned buf (at least helps | |
421 | non-Unix server case) */ | |
422 | ||
423 | /* BB we can not do this if this is the second open of a file | |
424 | and the first handle has writebehind data, we might be | |
425 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ | |
426 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
427 | if (!buf) { | |
428 | rc = -ENOMEM; | |
429 | goto out; | |
430 | } | |
431 | ||
432 | if (tcon->ses->capabilities & CAP_NT_SMBS) | |
433 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
434 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
435 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
436 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
437 | else | |
438 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
439 | ||
440 | if (rc == -EIO) { | |
441 | /* Old server, try legacy style OpenX */ | |
442 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
443 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
444 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
445 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
446 | } | |
447 | if (rc) { | |
448 | cFYI(1, "cifs_open returned 0x%x", rc); | |
449 | goto out; | |
450 | } | |
451 | ||
452 | rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid); | |
453 | if (rc != 0) | |
454 | goto out; | |
455 | ||
456 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); | |
457 | if (pCifsFile == NULL) { | |
458 | rc = -ENOMEM; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | cifs_fscache_set_inode_cookie(inode, file); | |
463 | ||
464 | if (oplock & CIFS_CREATE_ACTION) { | |
465 | /* time to set mode which we can not set earlier due to | |
466 | problems creating new read-only files */ | |
467 | if (tcon->unix_ext) { | |
468 | struct cifs_unix_set_info_args args = { | |
469 | .mode = inode->i_mode, | |
470 | .uid = NO_CHANGE_64, | |
471 | .gid = NO_CHANGE_64, | |
472 | .ctime = NO_CHANGE_64, | |
473 | .atime = NO_CHANGE_64, | |
474 | .mtime = NO_CHANGE_64, | |
475 | .device = 0, | |
476 | }; | |
477 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, | |
478 | cifs_sb->local_nls, | |
479 | cifs_sb->mnt_cifs_flags & | |
480 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
481 | } | |
482 | } | |
483 | ||
484 | out: | |
485 | kfree(buf); | |
486 | kfree(full_path); | |
487 | FreeXid(xid); | |
488 | cifs_put_tlink(tlink); | |
489 | return rc; | |
490 | } | |
491 | ||
492 | /* Try to reacquire byte range locks that were released when session */ | |
493 | /* to server was lost */ | |
494 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
495 | { | |
496 | int rc = 0; | |
497 | ||
498 | /* BB list all locks open on this file and relock */ | |
499 | ||
500 | return rc; | |
501 | } | |
502 | ||
503 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) | |
504 | { | |
505 | int rc = -EACCES; | |
506 | int xid; | |
507 | __u32 oplock; | |
508 | struct cifs_sb_info *cifs_sb; | |
509 | struct cifsTconInfo *tcon; | |
510 | struct cifsInodeInfo *pCifsInode; | |
511 | struct inode *inode; | |
512 | char *full_path = NULL; | |
513 | int desiredAccess; | |
514 | int disposition = FILE_OPEN; | |
515 | __u16 netfid; | |
516 | ||
517 | xid = GetXid(); | |
518 | mutex_lock(&pCifsFile->fh_mutex); | |
519 | if (!pCifsFile->invalidHandle) { | |
520 | mutex_unlock(&pCifsFile->fh_mutex); | |
521 | rc = 0; | |
522 | FreeXid(xid); | |
523 | return rc; | |
524 | } | |
525 | ||
526 | inode = pCifsFile->dentry->d_inode; | |
527 | cifs_sb = CIFS_SB(inode->i_sb); | |
528 | tcon = tlink_tcon(pCifsFile->tlink); | |
529 | ||
530 | /* can not grab rename sem here because various ops, including | |
531 | those that already have the rename sem can end up causing writepage | |
532 | to get called and if the server was down that means we end up here, | |
533 | and we can never tell if the caller already has the rename_sem */ | |
534 | full_path = build_path_from_dentry(pCifsFile->dentry); | |
535 | if (full_path == NULL) { | |
536 | rc = -ENOMEM; | |
537 | mutex_unlock(&pCifsFile->fh_mutex); | |
538 | FreeXid(xid); | |
539 | return rc; | |
540 | } | |
541 | ||
542 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", | |
543 | inode, pCifsFile->f_flags, full_path); | |
544 | ||
545 | if (oplockEnabled) | |
546 | oplock = REQ_OPLOCK; | |
547 | else | |
548 | oplock = 0; | |
549 | ||
550 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && | |
551 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
552 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
553 | ||
554 | /* | |
555 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
556 | * original open. Must mask them off for a reopen. | |
557 | */ | |
558 | unsigned int oflags = pCifsFile->f_flags & | |
559 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
560 | ||
561 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, | |
562 | cifs_sb->mnt_file_mode /* ignored */, | |
563 | oflags, &oplock, &netfid, xid); | |
564 | if (rc == 0) { | |
565 | cFYI(1, "posix reopen succeeded"); | |
566 | goto reopen_success; | |
567 | } | |
568 | /* fallthrough to retry open the old way on errors, especially | |
569 | in the reconnect path it is important to retry hard */ | |
570 | } | |
571 | ||
572 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); | |
573 | ||
574 | /* Can not refresh inode by passing in file_info buf to be returned | |
575 | by SMBOpen and then calling get_inode_info with returned buf | |
576 | since file might have write behind data that needs to be flushed | |
577 | and server version of file size can be stale. If we knew for sure | |
578 | that inode was not dirty locally we could do this */ | |
579 | ||
580 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, | |
581 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
582 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
583 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
584 | if (rc) { | |
585 | mutex_unlock(&pCifsFile->fh_mutex); | |
586 | cFYI(1, "cifs_open returned 0x%x", rc); | |
587 | cFYI(1, "oplock: %d", oplock); | |
588 | goto reopen_error_exit; | |
589 | } | |
590 | ||
591 | reopen_success: | |
592 | pCifsFile->netfid = netfid; | |
593 | pCifsFile->invalidHandle = false; | |
594 | mutex_unlock(&pCifsFile->fh_mutex); | |
595 | pCifsInode = CIFS_I(inode); | |
596 | ||
597 | if (can_flush) { | |
598 | rc = filemap_write_and_wait(inode->i_mapping); | |
599 | mapping_set_error(inode->i_mapping, rc); | |
600 | ||
601 | if (tcon->unix_ext) | |
602 | rc = cifs_get_inode_info_unix(&inode, | |
603 | full_path, inode->i_sb, xid); | |
604 | else | |
605 | rc = cifs_get_inode_info(&inode, | |
606 | full_path, NULL, inode->i_sb, | |
607 | xid, NULL); | |
608 | } /* else we are writing out data to server already | |
609 | and could deadlock if we tried to flush data, and | |
610 | since we do not know if we have data that would | |
611 | invalidate the current end of file on the server | |
612 | we can not go to the server to get the new inod | |
613 | info */ | |
614 | ||
615 | cifs_set_oplock_level(inode, oplock); | |
616 | ||
617 | cifs_relock_file(pCifsFile); | |
618 | ||
619 | reopen_error_exit: | |
620 | kfree(full_path); | |
621 | FreeXid(xid); | |
622 | return rc; | |
623 | } | |
624 | ||
625 | int cifs_close(struct inode *inode, struct file *file) | |
626 | { | |
627 | cifsFileInfo_put(file->private_data); | |
628 | file->private_data = NULL; | |
629 | ||
630 | /* return code from the ->release op is always ignored */ | |
631 | return 0; | |
632 | } | |
633 | ||
634 | int cifs_closedir(struct inode *inode, struct file *file) | |
635 | { | |
636 | int rc = 0; | |
637 | int xid; | |
638 | struct cifsFileInfo *pCFileStruct = file->private_data; | |
639 | char *ptmp; | |
640 | ||
641 | cFYI(1, "Closedir inode = 0x%p", inode); | |
642 | ||
643 | xid = GetXid(); | |
644 | ||
645 | if (pCFileStruct) { | |
646 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); | |
647 | ||
648 | cFYI(1, "Freeing private data in close dir"); | |
649 | spin_lock(&cifs_file_list_lock); | |
650 | if (!pCFileStruct->srch_inf.endOfSearch && | |
651 | !pCFileStruct->invalidHandle) { | |
652 | pCFileStruct->invalidHandle = true; | |
653 | spin_unlock(&cifs_file_list_lock); | |
654 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
655 | cFYI(1, "Closing uncompleted readdir with rc %d", | |
656 | rc); | |
657 | /* not much we can do if it fails anyway, ignore rc */ | |
658 | rc = 0; | |
659 | } else | |
660 | spin_unlock(&cifs_file_list_lock); | |
661 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
662 | if (ptmp) { | |
663 | cFYI(1, "closedir free smb buf in srch struct"); | |
664 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; | |
665 | if (pCFileStruct->srch_inf.smallBuf) | |
666 | cifs_small_buf_release(ptmp); | |
667 | else | |
668 | cifs_buf_release(ptmp); | |
669 | } | |
670 | cifs_put_tlink(pCFileStruct->tlink); | |
671 | kfree(file->private_data); | |
672 | file->private_data = NULL; | |
673 | } | |
674 | /* BB can we lock the filestruct while this is going on? */ | |
675 | FreeXid(xid); | |
676 | return rc; | |
677 | } | |
678 | ||
679 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, | |
680 | __u64 offset, __u8 lockType) | |
681 | { | |
682 | struct cifsLockInfo *li = | |
683 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
684 | if (li == NULL) | |
685 | return -ENOMEM; | |
686 | li->offset = offset; | |
687 | li->length = len; | |
688 | li->type = lockType; | |
689 | mutex_lock(&fid->lock_mutex); | |
690 | list_add(&li->llist, &fid->llist); | |
691 | mutex_unlock(&fid->lock_mutex); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) | |
696 | { | |
697 | int rc, xid; | |
698 | __u32 numLock = 0; | |
699 | __u32 numUnlock = 0; | |
700 | __u64 length; | |
701 | bool wait_flag = false; | |
702 | struct cifs_sb_info *cifs_sb; | |
703 | struct cifsTconInfo *tcon; | |
704 | __u16 netfid; | |
705 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
706 | bool posix_locking = 0; | |
707 | ||
708 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
709 | rc = -EACCES; | |
710 | xid = GetXid(); | |
711 | ||
712 | cFYI(1, "Lock parm: 0x%x flockflags: " | |
713 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
714 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, | |
715 | pfLock->fl_end); | |
716 | ||
717 | if (pfLock->fl_flags & FL_POSIX) | |
718 | cFYI(1, "Posix"); | |
719 | if (pfLock->fl_flags & FL_FLOCK) | |
720 | cFYI(1, "Flock"); | |
721 | if (pfLock->fl_flags & FL_SLEEP) { | |
722 | cFYI(1, "Blocking lock"); | |
723 | wait_flag = true; | |
724 | } | |
725 | if (pfLock->fl_flags & FL_ACCESS) | |
726 | cFYI(1, "Process suspended by mandatory locking - " | |
727 | "not implemented yet"); | |
728 | if (pfLock->fl_flags & FL_LEASE) | |
729 | cFYI(1, "Lease on file - not implemented yet"); | |
730 | if (pfLock->fl_flags & | |
731 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) | |
732 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); | |
733 | ||
734 | if (pfLock->fl_type == F_WRLCK) { | |
735 | cFYI(1, "F_WRLCK "); | |
736 | numLock = 1; | |
737 | } else if (pfLock->fl_type == F_UNLCK) { | |
738 | cFYI(1, "F_UNLCK"); | |
739 | numUnlock = 1; | |
740 | /* Check if unlock includes more than | |
741 | one lock range */ | |
742 | } else if (pfLock->fl_type == F_RDLCK) { | |
743 | cFYI(1, "F_RDLCK"); | |
744 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
745 | numLock = 1; | |
746 | } else if (pfLock->fl_type == F_EXLCK) { | |
747 | cFYI(1, "F_EXLCK"); | |
748 | numLock = 1; | |
749 | } else if (pfLock->fl_type == F_SHLCK) { | |
750 | cFYI(1, "F_SHLCK"); | |
751 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
752 | numLock = 1; | |
753 | } else | |
754 | cFYI(1, "Unknown type of lock"); | |
755 | ||
756 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
757 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); | |
758 | ||
759 | if (file->private_data == NULL) { | |
760 | rc = -EBADF; | |
761 | FreeXid(xid); | |
762 | return rc; | |
763 | } | |
764 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; | |
765 | ||
766 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
767 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
768 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
769 | posix_locking = 1; | |
770 | /* BB add code here to normalize offset and length to | |
771 | account for negative length which we can not accept over the | |
772 | wire */ | |
773 | if (IS_GETLK(cmd)) { | |
774 | if (posix_locking) { | |
775 | int posix_lock_type; | |
776 | if (lockType & LOCKING_ANDX_SHARED_LOCK) | |
777 | posix_lock_type = CIFS_RDLCK; | |
778 | else | |
779 | posix_lock_type = CIFS_WRLCK; | |
780 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, | |
781 | length, pfLock, | |
782 | posix_lock_type, wait_flag); | |
783 | FreeXid(xid); | |
784 | return rc; | |
785 | } | |
786 | ||
787 | /* BB we could chain these into one lock request BB */ | |
788 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, | |
789 | 0, 1, lockType, 0 /* wait flag */ ); | |
790 | if (rc == 0) { | |
791 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
792 | pfLock->fl_start, 1 /* numUnlock */ , | |
793 | 0 /* numLock */ , lockType, | |
794 | 0 /* wait flag */ ); | |
795 | pfLock->fl_type = F_UNLCK; | |
796 | if (rc != 0) | |
797 | cERROR(1, "Error unlocking previously locked " | |
798 | "range %d during test of lock", rc); | |
799 | rc = 0; | |
800 | ||
801 | } else { | |
802 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
803 | rc = 0; | |
804 | ||
805 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
806 | pfLock->fl_type = F_WRLCK; | |
807 | } else { | |
808 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
809 | pfLock->fl_start, 0, 1, | |
810 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
811 | 0 /* wait flag */); | |
812 | if (rc == 0) { | |
813 | rc = CIFSSMBLock(xid, tcon, netfid, | |
814 | length, pfLock->fl_start, 1, 0, | |
815 | lockType | | |
816 | LOCKING_ANDX_SHARED_LOCK, | |
817 | 0 /* wait flag */); | |
818 | pfLock->fl_type = F_RDLCK; | |
819 | if (rc != 0) | |
820 | cERROR(1, "Error unlocking " | |
821 | "previously locked range %d " | |
822 | "during test of lock", rc); | |
823 | rc = 0; | |
824 | } else { | |
825 | pfLock->fl_type = F_WRLCK; | |
826 | rc = 0; | |
827 | } | |
828 | } | |
829 | } | |
830 | ||
831 | FreeXid(xid); | |
832 | return rc; | |
833 | } | |
834 | ||
835 | if (!numLock && !numUnlock) { | |
836 | /* if no lock or unlock then nothing | |
837 | to do since we do not know what it is */ | |
838 | FreeXid(xid); | |
839 | return -EOPNOTSUPP; | |
840 | } | |
841 | ||
842 | if (posix_locking) { | |
843 | int posix_lock_type; | |
844 | if (lockType & LOCKING_ANDX_SHARED_LOCK) | |
845 | posix_lock_type = CIFS_RDLCK; | |
846 | else | |
847 | posix_lock_type = CIFS_WRLCK; | |
848 | ||
849 | if (numUnlock == 1) | |
850 | posix_lock_type = CIFS_UNLCK; | |
851 | ||
852 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, | |
853 | length, pfLock, | |
854 | posix_lock_type, wait_flag); | |
855 | } else { | |
856 | struct cifsFileInfo *fid = file->private_data; | |
857 | ||
858 | if (numLock) { | |
859 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
860 | pfLock->fl_start, | |
861 | 0, numLock, lockType, wait_flag); | |
862 | ||
863 | if (rc == 0) { | |
864 | /* For Windows locks we must store them. */ | |
865 | rc = store_file_lock(fid, length, | |
866 | pfLock->fl_start, lockType); | |
867 | } | |
868 | } else if (numUnlock) { | |
869 | /* For each stored lock that this unlock overlaps | |
870 | completely, unlock it. */ | |
871 | int stored_rc = 0; | |
872 | struct cifsLockInfo *li, *tmp; | |
873 | ||
874 | rc = 0; | |
875 | mutex_lock(&fid->lock_mutex); | |
876 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { | |
877 | if (pfLock->fl_start <= li->offset && | |
878 | (pfLock->fl_start + length) >= | |
879 | (li->offset + li->length)) { | |
880 | stored_rc = CIFSSMBLock(xid, tcon, | |
881 | netfid, | |
882 | li->length, li->offset, | |
883 | 1, 0, li->type, false); | |
884 | if (stored_rc) | |
885 | rc = stored_rc; | |
886 | else { | |
887 | list_del(&li->llist); | |
888 | kfree(li); | |
889 | } | |
890 | } | |
891 | } | |
892 | mutex_unlock(&fid->lock_mutex); | |
893 | } | |
894 | } | |
895 | ||
896 | if (pfLock->fl_flags & FL_POSIX) | |
897 | posix_lock_file_wait(file, pfLock); | |
898 | FreeXid(xid); | |
899 | return rc; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
904 | * these calls can be very long. | |
905 | * | |
906 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
907 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
908 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
909 | * welcome if someone wants to suggest one. | |
910 | * | |
911 | * We may be able to do a better job with this if there were some way to | |
912 | * declare that a file should be sparse. | |
913 | */ | |
914 | static int | |
915 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
916 | { | |
917 | if (offset <= cifsi->server_eof) | |
918 | return CIFS_STD_OP; | |
919 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
920 | return CIFS_VLONG_OP; | |
921 | else | |
922 | return CIFS_LONG_OP; | |
923 | } | |
924 | ||
925 | /* update the file size (if needed) after a write */ | |
926 | static void | |
927 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
928 | unsigned int bytes_written) | |
929 | { | |
930 | loff_t end_of_write = offset + bytes_written; | |
931 | ||
932 | if (end_of_write > cifsi->server_eof) | |
933 | cifsi->server_eof = end_of_write; | |
934 | } | |
935 | ||
936 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
937 | size_t write_size, loff_t *poffset) | |
938 | { | |
939 | struct inode *inode = file->f_path.dentry->d_inode; | |
940 | int rc = 0; | |
941 | unsigned int bytes_written = 0; | |
942 | unsigned int total_written; | |
943 | struct cifs_sb_info *cifs_sb; | |
944 | struct cifsTconInfo *pTcon; | |
945 | int xid, long_op; | |
946 | struct cifsFileInfo *open_file; | |
947 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
948 | ||
949 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
950 | ||
951 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, | |
952 | *poffset, file->f_path.dentry->d_name.name); */ | |
953 | ||
954 | if (file->private_data == NULL) | |
955 | return -EBADF; | |
956 | ||
957 | open_file = file->private_data; | |
958 | pTcon = tlink_tcon(open_file->tlink); | |
959 | ||
960 | rc = generic_write_checks(file, poffset, &write_size, 0); | |
961 | if (rc) | |
962 | return rc; | |
963 | ||
964 | xid = GetXid(); | |
965 | ||
966 | long_op = cifs_write_timeout(cifsi, *poffset); | |
967 | for (total_written = 0; write_size > total_written; | |
968 | total_written += bytes_written) { | |
969 | rc = -EAGAIN; | |
970 | while (rc == -EAGAIN) { | |
971 | if (file->private_data == NULL) { | |
972 | /* file has been closed on us */ | |
973 | FreeXid(xid); | |
974 | /* if we have gotten here we have written some data | |
975 | and blocked, and the file has been freed on us while | |
976 | we blocked so return what we managed to write */ | |
977 | return total_written; | |
978 | } | |
979 | if (open_file->invalidHandle) { | |
980 | /* we could deadlock if we called | |
981 | filemap_fdatawait from here so tell | |
982 | reopen_file not to flush data to server | |
983 | now */ | |
984 | rc = cifs_reopen_file(open_file, false); | |
985 | if (rc != 0) | |
986 | break; | |
987 | } | |
988 | ||
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 | NULL, write_data + total_written, long_op); | |
995 | } | |
996 | if (rc || (bytes_written == 0)) { | |
997 | if (total_written) | |
998 | break; | |
999 | else { | |
1000 | FreeXid(xid); | |
1001 | return rc; | |
1002 | } | |
1003 | } else { | |
1004 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1005 | *poffset += bytes_written; | |
1006 | } | |
1007 | long_op = CIFS_STD_OP; /* subsequent writes fast - | |
1008 | 15 seconds is plenty */ | |
1009 | } | |
1010 | ||
1011 | cifs_stats_bytes_written(pTcon, total_written); | |
1012 | ||
1013 | /* Do not update local mtime - server will set its actual value on write | |
1014 | * inode->i_ctime = inode->i_mtime = | |
1015 | * current_fs_time(inode->i_sb);*/ | |
1016 | if (total_written > 0) { | |
1017 | spin_lock(&inode->i_lock); | |
1018 | if (*poffset > inode->i_size) | |
1019 | i_size_write(inode, *poffset); | |
1020 | spin_unlock(&inode->i_lock); | |
1021 | } | |
1022 | mark_inode_dirty_sync(inode); | |
1023 | ||
1024 | FreeXid(xid); | |
1025 | return total_written; | |
1026 | } | |
1027 | ||
1028 | static ssize_t cifs_write(struct cifsFileInfo *open_file, | |
1029 | const char *write_data, size_t write_size, | |
1030 | loff_t *poffset) | |
1031 | { | |
1032 | int rc = 0; | |
1033 | unsigned int bytes_written = 0; | |
1034 | unsigned int total_written; | |
1035 | struct cifs_sb_info *cifs_sb; | |
1036 | struct cifsTconInfo *pTcon; | |
1037 | int xid, long_op; | |
1038 | struct dentry *dentry = open_file->dentry; | |
1039 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1040 | ||
1041 | cifs_sb = CIFS_SB(dentry->d_sb); | |
1042 | ||
1043 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, | |
1044 | *poffset, dentry->d_name.name); | |
1045 | ||
1046 | pTcon = tlink_tcon(open_file->tlink); | |
1047 | ||
1048 | xid = GetXid(); | |
1049 | ||
1050 | long_op = cifs_write_timeout(cifsi, *poffset); | |
1051 | for (total_written = 0; write_size > total_written; | |
1052 | total_written += bytes_written) { | |
1053 | rc = -EAGAIN; | |
1054 | while (rc == -EAGAIN) { | |
1055 | if (open_file->invalidHandle) { | |
1056 | /* we could deadlock if we called | |
1057 | filemap_fdatawait from here so tell | |
1058 | reopen_file not to flush data to | |
1059 | server now */ | |
1060 | rc = cifs_reopen_file(open_file, false); | |
1061 | if (rc != 0) | |
1062 | break; | |
1063 | } | |
1064 | if (experimEnabled || (pTcon->ses->server && | |
1065 | ((pTcon->ses->server->secMode & | |
1066 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1067 | == 0))) { | |
1068 | struct kvec iov[2]; | |
1069 | unsigned int len; | |
1070 | ||
1071 | len = min((size_t)cifs_sb->wsize, | |
1072 | write_size - total_written); | |
1073 | /* iov[0] is reserved for smb header */ | |
1074 | iov[1].iov_base = (char *)write_data + | |
1075 | total_written; | |
1076 | iov[1].iov_len = len; | |
1077 | rc = CIFSSMBWrite2(xid, pTcon, | |
1078 | open_file->netfid, len, | |
1079 | *poffset, &bytes_written, | |
1080 | iov, 1, long_op); | |
1081 | } else | |
1082 | rc = CIFSSMBWrite(xid, pTcon, | |
1083 | open_file->netfid, | |
1084 | min_t(const int, cifs_sb->wsize, | |
1085 | write_size - total_written), | |
1086 | *poffset, &bytes_written, | |
1087 | write_data + total_written, | |
1088 | NULL, long_op); | |
1089 | } | |
1090 | if (rc || (bytes_written == 0)) { | |
1091 | if (total_written) | |
1092 | break; | |
1093 | else { | |
1094 | FreeXid(xid); | |
1095 | return rc; | |
1096 | } | |
1097 | } else { | |
1098 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1099 | *poffset += bytes_written; | |
1100 | } | |
1101 | long_op = CIFS_STD_OP; /* subsequent writes fast - | |
1102 | 15 seconds is plenty */ | |
1103 | } | |
1104 | ||
1105 | cifs_stats_bytes_written(pTcon, total_written); | |
1106 | ||
1107 | if (total_written > 0) { | |
1108 | spin_lock(&dentry->d_inode->i_lock); | |
1109 | if (*poffset > dentry->d_inode->i_size) | |
1110 | i_size_write(dentry->d_inode, *poffset); | |
1111 | spin_unlock(&dentry->d_inode->i_lock); | |
1112 | } | |
1113 | mark_inode_dirty_sync(dentry->d_inode); | |
1114 | FreeXid(xid); | |
1115 | return total_written; | |
1116 | } | |
1117 | ||
1118 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
1119 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, | |
1120 | bool fsuid_only) | |
1121 | { | |
1122 | struct cifsFileInfo *open_file = NULL; | |
1123 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); | |
1124 | ||
1125 | /* only filter by fsuid on multiuser mounts */ | |
1126 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1127 | fsuid_only = false; | |
1128 | ||
1129 | spin_lock(&cifs_file_list_lock); | |
1130 | /* we could simply get the first_list_entry since write-only entries | |
1131 | are always at the end of the list but since the first entry might | |
1132 | have a close pending, we go through the whole list */ | |
1133 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1134 | if (fsuid_only && open_file->uid != current_fsuid()) | |
1135 | continue; | |
1136 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { | |
1137 | if (!open_file->invalidHandle) { | |
1138 | /* found a good file */ | |
1139 | /* lock it so it will not be closed on us */ | |
1140 | cifsFileInfo_get(open_file); | |
1141 | spin_unlock(&cifs_file_list_lock); | |
1142 | return open_file; | |
1143 | } /* else might as well continue, and look for | |
1144 | another, or simply have the caller reopen it | |
1145 | again rather than trying to fix this handle */ | |
1146 | } else /* write only file */ | |
1147 | break; /* write only files are last so must be done */ | |
1148 | } | |
1149 | spin_unlock(&cifs_file_list_lock); | |
1150 | return NULL; | |
1151 | } | |
1152 | #endif | |
1153 | ||
1154 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, | |
1155 | bool fsuid_only) | |
1156 | { | |
1157 | struct cifsFileInfo *open_file; | |
1158 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); | |
1159 | bool any_available = false; | |
1160 | int rc; | |
1161 | ||
1162 | /* Having a null inode here (because mapping->host was set to zero by | |
1163 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1164 | it being zero) during stress testcases so we need to check for it */ | |
1165 | ||
1166 | if (cifs_inode == NULL) { | |
1167 | cERROR(1, "Null inode passed to cifs_writeable_file"); | |
1168 | dump_stack(); | |
1169 | return NULL; | |
1170 | } | |
1171 | ||
1172 | /* only filter by fsuid on multiuser mounts */ | |
1173 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1174 | fsuid_only = false; | |
1175 | ||
1176 | spin_lock(&cifs_file_list_lock); | |
1177 | refind_writable: | |
1178 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1179 | if (!any_available && open_file->pid != current->tgid) | |
1180 | continue; | |
1181 | if (fsuid_only && open_file->uid != current_fsuid()) | |
1182 | continue; | |
1183 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { | |
1184 | cifsFileInfo_get(open_file); | |
1185 | ||
1186 | if (!open_file->invalidHandle) { | |
1187 | /* found a good writable file */ | |
1188 | spin_unlock(&cifs_file_list_lock); | |
1189 | return open_file; | |
1190 | } | |
1191 | ||
1192 | spin_unlock(&cifs_file_list_lock); | |
1193 | ||
1194 | /* Had to unlock since following call can block */ | |
1195 | rc = cifs_reopen_file(open_file, false); | |
1196 | if (!rc) | |
1197 | return open_file; | |
1198 | ||
1199 | /* if it fails, try another handle if possible */ | |
1200 | cFYI(1, "wp failed on reopen file"); | |
1201 | cifsFileInfo_put(open_file); | |
1202 | ||
1203 | spin_lock(&cifs_file_list_lock); | |
1204 | ||
1205 | /* else we simply continue to the next entry. Thus | |
1206 | we do not loop on reopen errors. If we | |
1207 | can not reopen the file, for example if we | |
1208 | reconnected to a server with another client | |
1209 | racing to delete or lock the file we would not | |
1210 | make progress if we restarted before the beginning | |
1211 | of the loop here. */ | |
1212 | } | |
1213 | } | |
1214 | /* couldn't find useable FH with same pid, try any available */ | |
1215 | if (!any_available) { | |
1216 | any_available = true; | |
1217 | goto refind_writable; | |
1218 | } | |
1219 | spin_unlock(&cifs_file_list_lock); | |
1220 | return NULL; | |
1221 | } | |
1222 | ||
1223 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) | |
1224 | { | |
1225 | struct address_space *mapping = page->mapping; | |
1226 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1227 | char *write_data; | |
1228 | int rc = -EFAULT; | |
1229 | int bytes_written = 0; | |
1230 | struct cifs_sb_info *cifs_sb; | |
1231 | struct inode *inode; | |
1232 | struct cifsFileInfo *open_file; | |
1233 | ||
1234 | if (!mapping || !mapping->host) | |
1235 | return -EFAULT; | |
1236 | ||
1237 | inode = page->mapping->host; | |
1238 | cifs_sb = CIFS_SB(inode->i_sb); | |
1239 | ||
1240 | offset += (loff_t)from; | |
1241 | write_data = kmap(page); | |
1242 | write_data += from; | |
1243 | ||
1244 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1245 | kunmap(page); | |
1246 | return -EIO; | |
1247 | } | |
1248 | ||
1249 | /* racing with truncate? */ | |
1250 | if (offset > mapping->host->i_size) { | |
1251 | kunmap(page); | |
1252 | return 0; /* don't care */ | |
1253 | } | |
1254 | ||
1255 | /* check to make sure that we are not extending the file */ | |
1256 | if (mapping->host->i_size - offset < (loff_t)to) | |
1257 | to = (unsigned)(mapping->host->i_size - offset); | |
1258 | ||
1259 | open_file = find_writable_file(CIFS_I(mapping->host), false); | |
1260 | if (open_file) { | |
1261 | bytes_written = cifs_write(open_file, write_data, | |
1262 | to - from, &offset); | |
1263 | cifsFileInfo_put(open_file); | |
1264 | /* Does mm or vfs already set times? */ | |
1265 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); | |
1266 | if ((bytes_written > 0) && (offset)) | |
1267 | rc = 0; | |
1268 | else if (bytes_written < 0) | |
1269 | rc = bytes_written; | |
1270 | } else { | |
1271 | cFYI(1, "No writeable filehandles for inode"); | |
1272 | rc = -EIO; | |
1273 | } | |
1274 | ||
1275 | kunmap(page); | |
1276 | return rc; | |
1277 | } | |
1278 | ||
1279 | static int cifs_writepages(struct address_space *mapping, | |
1280 | struct writeback_control *wbc) | |
1281 | { | |
1282 | unsigned int bytes_to_write; | |
1283 | unsigned int bytes_written; | |
1284 | struct cifs_sb_info *cifs_sb; | |
1285 | int done = 0; | |
1286 | pgoff_t end; | |
1287 | pgoff_t index; | |
1288 | int range_whole = 0; | |
1289 | struct kvec *iov; | |
1290 | int len; | |
1291 | int n_iov = 0; | |
1292 | pgoff_t next; | |
1293 | int nr_pages; | |
1294 | __u64 offset = 0; | |
1295 | struct cifsFileInfo *open_file; | |
1296 | struct cifsTconInfo *tcon; | |
1297 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); | |
1298 | struct page *page; | |
1299 | struct pagevec pvec; | |
1300 | int rc = 0; | |
1301 | int scanned = 0; | |
1302 | int xid, long_op; | |
1303 | ||
1304 | cifs_sb = CIFS_SB(mapping->host->i_sb); | |
1305 | ||
1306 | /* | |
1307 | * If wsize is smaller that the page cache size, default to writing | |
1308 | * one page at a time via cifs_writepage | |
1309 | */ | |
1310 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1311 | return generic_writepages(mapping, wbc); | |
1312 | ||
1313 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); | |
1314 | if (iov == NULL) | |
1315 | return generic_writepages(mapping, wbc); | |
1316 | ||
1317 | /* | |
1318 | * if there's no open file, then this is likely to fail too, | |
1319 | * but it'll at least handle the return. Maybe it should be | |
1320 | * a BUG() instead? | |
1321 | */ | |
1322 | open_file = find_writable_file(CIFS_I(mapping->host), false); | |
1323 | if (!open_file) { | |
1324 | kfree(iov); | |
1325 | return generic_writepages(mapping, wbc); | |
1326 | } | |
1327 | ||
1328 | tcon = tlink_tcon(open_file->tlink); | |
1329 | if (!experimEnabled && tcon->ses->server->secMode & | |
1330 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1331 | cifsFileInfo_put(open_file); | |
1332 | kfree(iov); | |
1333 | return generic_writepages(mapping, wbc); | |
1334 | } | |
1335 | cifsFileInfo_put(open_file); | |
1336 | ||
1337 | xid = GetXid(); | |
1338 | ||
1339 | pagevec_init(&pvec, 0); | |
1340 | if (wbc->range_cyclic) { | |
1341 | index = mapping->writeback_index; /* Start from prev offset */ | |
1342 | end = -1; | |
1343 | } else { | |
1344 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1345 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1346 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1347 | range_whole = 1; | |
1348 | scanned = 1; | |
1349 | } | |
1350 | retry: | |
1351 | while (!done && (index <= end) && | |
1352 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1353 | PAGECACHE_TAG_DIRTY, | |
1354 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1355 | int first; | |
1356 | unsigned int i; | |
1357 | ||
1358 | first = -1; | |
1359 | next = 0; | |
1360 | n_iov = 0; | |
1361 | bytes_to_write = 0; | |
1362 | ||
1363 | for (i = 0; i < nr_pages; i++) { | |
1364 | page = pvec.pages[i]; | |
1365 | /* | |
1366 | * At this point we hold neither mapping->tree_lock nor | |
1367 | * lock on the page itself: the page may be truncated or | |
1368 | * invalidated (changing page->mapping to NULL), or even | |
1369 | * swizzled back from swapper_space to tmpfs file | |
1370 | * mapping | |
1371 | */ | |
1372 | ||
1373 | if (first < 0) | |
1374 | lock_page(page); | |
1375 | else if (!trylock_page(page)) | |
1376 | break; | |
1377 | ||
1378 | if (unlikely(page->mapping != mapping)) { | |
1379 | unlock_page(page); | |
1380 | break; | |
1381 | } | |
1382 | ||
1383 | if (!wbc->range_cyclic && page->index > end) { | |
1384 | done = 1; | |
1385 | unlock_page(page); | |
1386 | break; | |
1387 | } | |
1388 | ||
1389 | if (next && (page->index != next)) { | |
1390 | /* Not next consecutive page */ | |
1391 | unlock_page(page); | |
1392 | break; | |
1393 | } | |
1394 | ||
1395 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1396 | wait_on_page_writeback(page); | |
1397 | ||
1398 | if (PageWriteback(page) || | |
1399 | !clear_page_dirty_for_io(page)) { | |
1400 | unlock_page(page); | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | /* | |
1405 | * This actually clears the dirty bit in the radix tree. | |
1406 | * See cifs_writepage() for more commentary. | |
1407 | */ | |
1408 | set_page_writeback(page); | |
1409 | ||
1410 | if (page_offset(page) >= mapping->host->i_size) { | |
1411 | done = 1; | |
1412 | unlock_page(page); | |
1413 | end_page_writeback(page); | |
1414 | break; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * BB can we get rid of this? pages are held by pvec | |
1419 | */ | |
1420 | page_cache_get(page); | |
1421 | ||
1422 | len = min(mapping->host->i_size - page_offset(page), | |
1423 | (loff_t)PAGE_CACHE_SIZE); | |
1424 | ||
1425 | /* reserve iov[0] for the smb header */ | |
1426 | n_iov++; | |
1427 | iov[n_iov].iov_base = kmap(page); | |
1428 | iov[n_iov].iov_len = len; | |
1429 | bytes_to_write += len; | |
1430 | ||
1431 | if (first < 0) { | |
1432 | first = i; | |
1433 | offset = page_offset(page); | |
1434 | } | |
1435 | next = page->index + 1; | |
1436 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1437 | break; | |
1438 | } | |
1439 | if (n_iov) { | |
1440 | open_file = find_writable_file(CIFS_I(mapping->host), | |
1441 | false); | |
1442 | if (!open_file) { | |
1443 | cERROR(1, "No writable handles for inode"); | |
1444 | rc = -EBADF; | |
1445 | } else { | |
1446 | long_op = cifs_write_timeout(cifsi, offset); | |
1447 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, | |
1448 | bytes_to_write, offset, | |
1449 | &bytes_written, iov, n_iov, | |
1450 | long_op); | |
1451 | cifsFileInfo_put(open_file); | |
1452 | cifs_update_eof(cifsi, offset, bytes_written); | |
1453 | } | |
1454 | ||
1455 | if (rc || bytes_written < bytes_to_write) { | |
1456 | cERROR(1, "Write2 ret %d, wrote %d", | |
1457 | rc, bytes_written); | |
1458 | mapping_set_error(mapping, rc); | |
1459 | } else { | |
1460 | cifs_stats_bytes_written(tcon, bytes_written); | |
1461 | } | |
1462 | ||
1463 | for (i = 0; i < n_iov; i++) { | |
1464 | page = pvec.pages[first + i]; | |
1465 | /* Should we also set page error on | |
1466 | success rc but too little data written? */ | |
1467 | /* BB investigate retry logic on temporary | |
1468 | server crash cases and how recovery works | |
1469 | when page marked as error */ | |
1470 | if (rc) | |
1471 | SetPageError(page); | |
1472 | kunmap(page); | |
1473 | unlock_page(page); | |
1474 | end_page_writeback(page); | |
1475 | page_cache_release(page); | |
1476 | } | |
1477 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1478 | done = 1; | |
1479 | index = next; | |
1480 | } else | |
1481 | /* Need to re-find the pages we skipped */ | |
1482 | index = pvec.pages[0]->index + 1; | |
1483 | ||
1484 | pagevec_release(&pvec); | |
1485 | } | |
1486 | if (!scanned && !done) { | |
1487 | /* | |
1488 | * We hit the last page and there is more work to be done: wrap | |
1489 | * back to the start of the file | |
1490 | */ | |
1491 | scanned = 1; | |
1492 | index = 0; | |
1493 | goto retry; | |
1494 | } | |
1495 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1496 | mapping->writeback_index = index; | |
1497 | ||
1498 | FreeXid(xid); | |
1499 | kfree(iov); | |
1500 | return rc; | |
1501 | } | |
1502 | ||
1503 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) | |
1504 | { | |
1505 | int rc = -EFAULT; | |
1506 | int xid; | |
1507 | ||
1508 | xid = GetXid(); | |
1509 | /* BB add check for wbc flags */ | |
1510 | page_cache_get(page); | |
1511 | if (!PageUptodate(page)) | |
1512 | cFYI(1, "ppw - page not up to date"); | |
1513 | ||
1514 | /* | |
1515 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1516 | * | |
1517 | * A writepage() implementation always needs to do either this, | |
1518 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1519 | * the case of a failure. | |
1520 | * | |
1521 | * Just unlocking the page will cause the radix tree tag-bits | |
1522 | * to fail to update with the state of the page correctly. | |
1523 | */ | |
1524 | set_page_writeback(page); | |
1525 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); | |
1526 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1527 | unlock_page(page); | |
1528 | end_page_writeback(page); | |
1529 | page_cache_release(page); | |
1530 | FreeXid(xid); | |
1531 | return rc; | |
1532 | } | |
1533 | ||
1534 | static int cifs_write_end(struct file *file, struct address_space *mapping, | |
1535 | loff_t pos, unsigned len, unsigned copied, | |
1536 | struct page *page, void *fsdata) | |
1537 | { | |
1538 | int rc; | |
1539 | struct inode *inode = mapping->host; | |
1540 | ||
1541 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", | |
1542 | page, pos, copied); | |
1543 | ||
1544 | if (PageChecked(page)) { | |
1545 | if (copied == len) | |
1546 | SetPageUptodate(page); | |
1547 | ClearPageChecked(page); | |
1548 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
1549 | SetPageUptodate(page); | |
1550 | ||
1551 | if (!PageUptodate(page)) { | |
1552 | char *page_data; | |
1553 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1554 | int xid; | |
1555 | ||
1556 | xid = GetXid(); | |
1557 | /* this is probably better than directly calling | |
1558 | partialpage_write since in this function the file handle is | |
1559 | known which we might as well leverage */ | |
1560 | /* BB check if anything else missing out of ppw | |
1561 | such as updating last write time */ | |
1562 | page_data = kmap(page); | |
1563 | rc = cifs_write(file->private_data, page_data + offset, | |
1564 | copied, &pos); | |
1565 | /* if (rc < 0) should we set writebehind rc? */ | |
1566 | kunmap(page); | |
1567 | ||
1568 | FreeXid(xid); | |
1569 | } else { | |
1570 | rc = copied; | |
1571 | pos += copied; | |
1572 | set_page_dirty(page); | |
1573 | } | |
1574 | ||
1575 | if (rc > 0) { | |
1576 | spin_lock(&inode->i_lock); | |
1577 | if (pos > inode->i_size) | |
1578 | i_size_write(inode, pos); | |
1579 | spin_unlock(&inode->i_lock); | |
1580 | } | |
1581 | ||
1582 | unlock_page(page); | |
1583 | page_cache_release(page); | |
1584 | ||
1585 | return rc; | |
1586 | } | |
1587 | ||
1588 | int cifs_fsync(struct file *file, int datasync) | |
1589 | { | |
1590 | int xid; | |
1591 | int rc = 0; | |
1592 | struct cifsTconInfo *tcon; | |
1593 | struct cifsFileInfo *smbfile = file->private_data; | |
1594 | struct inode *inode = file->f_path.dentry->d_inode; | |
1595 | ||
1596 | xid = GetXid(); | |
1597 | ||
1598 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1599 | file->f_path.dentry->d_name.name, datasync); | |
1600 | ||
1601 | rc = filemap_write_and_wait(inode->i_mapping); | |
1602 | if (rc == 0) { | |
1603 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
1604 | ||
1605 | tcon = tlink_tcon(smbfile->tlink); | |
1606 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1607 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1608 | } | |
1609 | ||
1610 | FreeXid(xid); | |
1611 | return rc; | |
1612 | } | |
1613 | ||
1614 | /* static void cifs_sync_page(struct page *page) | |
1615 | { | |
1616 | struct address_space *mapping; | |
1617 | struct inode *inode; | |
1618 | unsigned long index = page->index; | |
1619 | unsigned int rpages = 0; | |
1620 | int rc = 0; | |
1621 | ||
1622 | cFYI(1, "sync page %p", page); | |
1623 | mapping = page->mapping; | |
1624 | if (!mapping) | |
1625 | return 0; | |
1626 | inode = mapping->host; | |
1627 | if (!inode) | |
1628 | return; */ | |
1629 | ||
1630 | /* fill in rpages then | |
1631 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ | |
1632 | ||
1633 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); | |
1634 | ||
1635 | #if 0 | |
1636 | if (rc < 0) | |
1637 | return rc; | |
1638 | return 0; | |
1639 | #endif | |
1640 | } */ | |
1641 | ||
1642 | /* | |
1643 | * As file closes, flush all cached write data for this inode checking | |
1644 | * for write behind errors. | |
1645 | */ | |
1646 | int cifs_flush(struct file *file, fl_owner_t id) | |
1647 | { | |
1648 | struct inode *inode = file->f_path.dentry->d_inode; | |
1649 | int rc = 0; | |
1650 | ||
1651 | if (file->f_mode & FMODE_WRITE) | |
1652 | rc = filemap_write_and_wait(inode->i_mapping); | |
1653 | ||
1654 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); | |
1655 | ||
1656 | return rc; | |
1657 | } | |
1658 | ||
1659 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1660 | size_t read_size, loff_t *poffset) | |
1661 | { | |
1662 | int rc = -EACCES; | |
1663 | unsigned int bytes_read = 0; | |
1664 | unsigned int total_read = 0; | |
1665 | unsigned int current_read_size; | |
1666 | struct cifs_sb_info *cifs_sb; | |
1667 | struct cifsTconInfo *pTcon; | |
1668 | int xid; | |
1669 | struct cifsFileInfo *open_file; | |
1670 | char *smb_read_data; | |
1671 | char __user *current_offset; | |
1672 | struct smb_com_read_rsp *pSMBr; | |
1673 | ||
1674 | xid = GetXid(); | |
1675 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1676 | ||
1677 | if (file->private_data == NULL) { | |
1678 | rc = -EBADF; | |
1679 | FreeXid(xid); | |
1680 | return rc; | |
1681 | } | |
1682 | open_file = file->private_data; | |
1683 | pTcon = tlink_tcon(open_file->tlink); | |
1684 | ||
1685 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1686 | cFYI(1, "attempting read on write only file instance"); | |
1687 | ||
1688 | for (total_read = 0, current_offset = read_data; | |
1689 | read_size > total_read; | |
1690 | total_read += bytes_read, current_offset += bytes_read) { | |
1691 | current_read_size = min_t(const int, read_size - total_read, | |
1692 | cifs_sb->rsize); | |
1693 | rc = -EAGAIN; | |
1694 | smb_read_data = NULL; | |
1695 | while (rc == -EAGAIN) { | |
1696 | int buf_type = CIFS_NO_BUFFER; | |
1697 | if (open_file->invalidHandle) { | |
1698 | rc = cifs_reopen_file(open_file, true); | |
1699 | if (rc != 0) | |
1700 | break; | |
1701 | } | |
1702 | rc = CIFSSMBRead(xid, pTcon, | |
1703 | open_file->netfid, | |
1704 | current_read_size, *poffset, | |
1705 | &bytes_read, &smb_read_data, | |
1706 | &buf_type); | |
1707 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1708 | if (smb_read_data) { | |
1709 | if (copy_to_user(current_offset, | |
1710 | smb_read_data + | |
1711 | 4 /* RFC1001 length field */ + | |
1712 | le16_to_cpu(pSMBr->DataOffset), | |
1713 | bytes_read)) | |
1714 | rc = -EFAULT; | |
1715 | ||
1716 | if (buf_type == CIFS_SMALL_BUFFER) | |
1717 | cifs_small_buf_release(smb_read_data); | |
1718 | else if (buf_type == CIFS_LARGE_BUFFER) | |
1719 | cifs_buf_release(smb_read_data); | |
1720 | smb_read_data = NULL; | |
1721 | } | |
1722 | } | |
1723 | if (rc || (bytes_read == 0)) { | |
1724 | if (total_read) { | |
1725 | break; | |
1726 | } else { | |
1727 | FreeXid(xid); | |
1728 | return rc; | |
1729 | } | |
1730 | } else { | |
1731 | cifs_stats_bytes_read(pTcon, bytes_read); | |
1732 | *poffset += bytes_read; | |
1733 | } | |
1734 | } | |
1735 | FreeXid(xid); | |
1736 | return total_read; | |
1737 | } | |
1738 | ||
1739 | ||
1740 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1741 | loff_t *poffset) | |
1742 | { | |
1743 | int rc = -EACCES; | |
1744 | unsigned int bytes_read = 0; | |
1745 | unsigned int total_read; | |
1746 | unsigned int current_read_size; | |
1747 | struct cifs_sb_info *cifs_sb; | |
1748 | struct cifsTconInfo *pTcon; | |
1749 | int xid; | |
1750 | char *current_offset; | |
1751 | struct cifsFileInfo *open_file; | |
1752 | int buf_type = CIFS_NO_BUFFER; | |
1753 | ||
1754 | xid = GetXid(); | |
1755 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1756 | ||
1757 | if (file->private_data == NULL) { | |
1758 | rc = -EBADF; | |
1759 | FreeXid(xid); | |
1760 | return rc; | |
1761 | } | |
1762 | open_file = file->private_data; | |
1763 | pTcon = tlink_tcon(open_file->tlink); | |
1764 | ||
1765 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1766 | cFYI(1, "attempting read on write only file instance"); | |
1767 | ||
1768 | for (total_read = 0, current_offset = read_data; | |
1769 | read_size > total_read; | |
1770 | total_read += bytes_read, current_offset += bytes_read) { | |
1771 | current_read_size = min_t(const int, read_size - total_read, | |
1772 | cifs_sb->rsize); | |
1773 | /* For windows me and 9x we do not want to request more | |
1774 | than it negotiated since it will refuse the read then */ | |
1775 | if ((pTcon->ses) && | |
1776 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { | |
1777 | current_read_size = min_t(const int, current_read_size, | |
1778 | pTcon->ses->server->maxBuf - 128); | |
1779 | } | |
1780 | rc = -EAGAIN; | |
1781 | while (rc == -EAGAIN) { | |
1782 | if (open_file->invalidHandle) { | |
1783 | rc = cifs_reopen_file(open_file, true); | |
1784 | if (rc != 0) | |
1785 | break; | |
1786 | } | |
1787 | rc = CIFSSMBRead(xid, pTcon, | |
1788 | open_file->netfid, | |
1789 | current_read_size, *poffset, | |
1790 | &bytes_read, ¤t_offset, | |
1791 | &buf_type); | |
1792 | } | |
1793 | if (rc || (bytes_read == 0)) { | |
1794 | if (total_read) { | |
1795 | break; | |
1796 | } else { | |
1797 | FreeXid(xid); | |
1798 | return rc; | |
1799 | } | |
1800 | } else { | |
1801 | cifs_stats_bytes_read(pTcon, total_read); | |
1802 | *poffset += bytes_read; | |
1803 | } | |
1804 | } | |
1805 | FreeXid(xid); | |
1806 | return total_read; | |
1807 | } | |
1808 | ||
1809 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1810 | { | |
1811 | int rc, xid; | |
1812 | ||
1813 | xid = GetXid(); | |
1814 | rc = cifs_revalidate_file(file); | |
1815 | if (rc) { | |
1816 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); | |
1817 | FreeXid(xid); | |
1818 | return rc; | |
1819 | } | |
1820 | rc = generic_file_mmap(file, vma); | |
1821 | FreeXid(xid); | |
1822 | return rc; | |
1823 | } | |
1824 | ||
1825 | ||
1826 | static void cifs_copy_cache_pages(struct address_space *mapping, | |
1827 | struct list_head *pages, int bytes_read, char *data) | |
1828 | { | |
1829 | struct page *page; | |
1830 | char *target; | |
1831 | ||
1832 | while (bytes_read > 0) { | |
1833 | if (list_empty(pages)) | |
1834 | break; | |
1835 | ||
1836 | page = list_entry(pages->prev, struct page, lru); | |
1837 | list_del(&page->lru); | |
1838 | ||
1839 | if (add_to_page_cache_lru(page, mapping, page->index, | |
1840 | GFP_KERNEL)) { | |
1841 | page_cache_release(page); | |
1842 | cFYI(1, "Add page cache failed"); | |
1843 | data += PAGE_CACHE_SIZE; | |
1844 | bytes_read -= PAGE_CACHE_SIZE; | |
1845 | continue; | |
1846 | } | |
1847 | page_cache_release(page); | |
1848 | ||
1849 | target = kmap_atomic(page, KM_USER0); | |
1850 | ||
1851 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1852 | memcpy(target, data, bytes_read); | |
1853 | /* zero the tail end of this partial page */ | |
1854 | memset(target + bytes_read, 0, | |
1855 | PAGE_CACHE_SIZE - bytes_read); | |
1856 | bytes_read = 0; | |
1857 | } else { | |
1858 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1859 | bytes_read -= PAGE_CACHE_SIZE; | |
1860 | } | |
1861 | kunmap_atomic(target, KM_USER0); | |
1862 | ||
1863 | flush_dcache_page(page); | |
1864 | SetPageUptodate(page); | |
1865 | unlock_page(page); | |
1866 | data += PAGE_CACHE_SIZE; | |
1867 | ||
1868 | /* add page to FS-Cache */ | |
1869 | cifs_readpage_to_fscache(mapping->host, page); | |
1870 | } | |
1871 | return; | |
1872 | } | |
1873 | ||
1874 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1875 | struct list_head *page_list, unsigned num_pages) | |
1876 | { | |
1877 | int rc = -EACCES; | |
1878 | int xid; | |
1879 | loff_t offset; | |
1880 | struct page *page; | |
1881 | struct cifs_sb_info *cifs_sb; | |
1882 | struct cifsTconInfo *pTcon; | |
1883 | unsigned int bytes_read = 0; | |
1884 | unsigned int read_size, i; | |
1885 | char *smb_read_data = NULL; | |
1886 | struct smb_com_read_rsp *pSMBr; | |
1887 | struct cifsFileInfo *open_file; | |
1888 | int buf_type = CIFS_NO_BUFFER; | |
1889 | ||
1890 | xid = GetXid(); | |
1891 | if (file->private_data == NULL) { | |
1892 | rc = -EBADF; | |
1893 | FreeXid(xid); | |
1894 | return rc; | |
1895 | } | |
1896 | open_file = file->private_data; | |
1897 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1898 | pTcon = tlink_tcon(open_file->tlink); | |
1899 | ||
1900 | /* | |
1901 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1902 | * immediately if the cookie is negative | |
1903 | */ | |
1904 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1905 | &num_pages); | |
1906 | if (rc == 0) | |
1907 | goto read_complete; | |
1908 | ||
1909 | cFYI(DBG2, "rpages: num pages %d", num_pages); | |
1910 | for (i = 0; i < num_pages; ) { | |
1911 | unsigned contig_pages; | |
1912 | struct page *tmp_page; | |
1913 | unsigned long expected_index; | |
1914 | ||
1915 | if (list_empty(page_list)) | |
1916 | break; | |
1917 | ||
1918 | page = list_entry(page_list->prev, struct page, lru); | |
1919 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1920 | ||
1921 | /* count adjacent pages that we will read into */ | |
1922 | contig_pages = 0; | |
1923 | expected_index = | |
1924 | list_entry(page_list->prev, struct page, lru)->index; | |
1925 | list_for_each_entry_reverse(tmp_page, page_list, lru) { | |
1926 | if (tmp_page->index == expected_index) { | |
1927 | contig_pages++; | |
1928 | expected_index++; | |
1929 | } else | |
1930 | break; | |
1931 | } | |
1932 | if (contig_pages + i > num_pages) | |
1933 | contig_pages = num_pages - i; | |
1934 | ||
1935 | /* for reads over a certain size could initiate async | |
1936 | read ahead */ | |
1937 | ||
1938 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1939 | /* Read size needs to be in multiples of one page */ | |
1940 | read_size = min_t(const unsigned int, read_size, | |
1941 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
1942 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", | |
1943 | read_size, contig_pages); | |
1944 | rc = -EAGAIN; | |
1945 | while (rc == -EAGAIN) { | |
1946 | if (open_file->invalidHandle) { | |
1947 | rc = cifs_reopen_file(open_file, true); | |
1948 | if (rc != 0) | |
1949 | break; | |
1950 | } | |
1951 | ||
1952 | rc = CIFSSMBRead(xid, pTcon, | |
1953 | open_file->netfid, | |
1954 | read_size, offset, | |
1955 | &bytes_read, &smb_read_data, | |
1956 | &buf_type); | |
1957 | /* BB more RC checks ? */ | |
1958 | if (rc == -EAGAIN) { | |
1959 | if (smb_read_data) { | |
1960 | if (buf_type == CIFS_SMALL_BUFFER) | |
1961 | cifs_small_buf_release(smb_read_data); | |
1962 | else if (buf_type == CIFS_LARGE_BUFFER) | |
1963 | cifs_buf_release(smb_read_data); | |
1964 | smb_read_data = NULL; | |
1965 | } | |
1966 | } | |
1967 | } | |
1968 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1969 | cFYI(1, "Read error in readpages: %d", rc); | |
1970 | break; | |
1971 | } else if (bytes_read > 0) { | |
1972 | task_io_account_read(bytes_read); | |
1973 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1974 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1975 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1976 | le16_to_cpu(pSMBr->DataOffset)); | |
1977 | ||
1978 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
1979 | cifs_stats_bytes_read(pTcon, bytes_read); | |
1980 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { | |
1981 | i++; /* account for partial page */ | |
1982 | ||
1983 | /* server copy of file can have smaller size | |
1984 | than client */ | |
1985 | /* BB do we need to verify this common case ? | |
1986 | this case is ok - if we are at server EOF | |
1987 | we will hit it on next read */ | |
1988 | ||
1989 | /* break; */ | |
1990 | } | |
1991 | } else { | |
1992 | cFYI(1, "No bytes read (%d) at offset %lld . " | |
1993 | "Cleaning remaining pages from readahead list", | |
1994 | bytes_read, offset); | |
1995 | /* BB turn off caching and do new lookup on | |
1996 | file size at server? */ | |
1997 | break; | |
1998 | } | |
1999 | if (smb_read_data) { | |
2000 | if (buf_type == CIFS_SMALL_BUFFER) | |
2001 | cifs_small_buf_release(smb_read_data); | |
2002 | else if (buf_type == CIFS_LARGE_BUFFER) | |
2003 | cifs_buf_release(smb_read_data); | |
2004 | smb_read_data = NULL; | |
2005 | } | |
2006 | bytes_read = 0; | |
2007 | } | |
2008 | ||
2009 | /* need to free smb_read_data buf before exit */ | |
2010 | if (smb_read_data) { | |
2011 | if (buf_type == CIFS_SMALL_BUFFER) | |
2012 | cifs_small_buf_release(smb_read_data); | |
2013 | else if (buf_type == CIFS_LARGE_BUFFER) | |
2014 | cifs_buf_release(smb_read_data); | |
2015 | smb_read_data = NULL; | |
2016 | } | |
2017 | ||
2018 | read_complete: | |
2019 | FreeXid(xid); | |
2020 | return rc; | |
2021 | } | |
2022 | ||
2023 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2024 | loff_t *poffset) | |
2025 | { | |
2026 | char *read_data; | |
2027 | int rc; | |
2028 | ||
2029 | /* Is the page cached? */ | |
2030 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2031 | if (rc == 0) | |
2032 | goto read_complete; | |
2033 | ||
2034 | page_cache_get(page); | |
2035 | read_data = kmap(page); | |
2036 | /* for reads over a certain size could initiate async read ahead */ | |
2037 | ||
2038 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); | |
2039 | ||
2040 | if (rc < 0) | |
2041 | goto io_error; | |
2042 | else | |
2043 | cFYI(1, "Bytes read %d", rc); | |
2044 | ||
2045 | file->f_path.dentry->d_inode->i_atime = | |
2046 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
2047 | ||
2048 | if (PAGE_CACHE_SIZE > rc) | |
2049 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2050 | ||
2051 | flush_dcache_page(page); | |
2052 | SetPageUptodate(page); | |
2053 | ||
2054 | /* send this page to the cache */ | |
2055 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2056 | ||
2057 | rc = 0; | |
2058 | ||
2059 | io_error: | |
2060 | kunmap(page); | |
2061 | page_cache_release(page); | |
2062 | ||
2063 | read_complete: | |
2064 | return rc; | |
2065 | } | |
2066 | ||
2067 | static int cifs_readpage(struct file *file, struct page *page) | |
2068 | { | |
2069 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2070 | int rc = -EACCES; | |
2071 | int xid; | |
2072 | ||
2073 | xid = GetXid(); | |
2074 | ||
2075 | if (file->private_data == NULL) { | |
2076 | rc = -EBADF; | |
2077 | FreeXid(xid); | |
2078 | return rc; | |
2079 | } | |
2080 | ||
2081 | cFYI(1, "readpage %p at offset %d 0x%x\n", | |
2082 | page, (int)offset, (int)offset); | |
2083 | ||
2084 | rc = cifs_readpage_worker(file, page, &offset); | |
2085 | ||
2086 | unlock_page(page); | |
2087 | ||
2088 | FreeXid(xid); | |
2089 | return rc; | |
2090 | } | |
2091 | ||
2092 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) | |
2093 | { | |
2094 | struct cifsFileInfo *open_file; | |
2095 | ||
2096 | spin_lock(&cifs_file_list_lock); | |
2097 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2098 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { | |
2099 | spin_unlock(&cifs_file_list_lock); | |
2100 | return 1; | |
2101 | } | |
2102 | } | |
2103 | spin_unlock(&cifs_file_list_lock); | |
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | /* We do not want to update the file size from server for inodes | |
2108 | open for write - to avoid races with writepage extending | |
2109 | the file - in the future we could consider allowing | |
2110 | refreshing the inode only on increases in the file size | |
2111 | but this is tricky to do without racing with writebehind | |
2112 | page caching in the current Linux kernel design */ | |
2113 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) | |
2114 | { | |
2115 | if (!cifsInode) | |
2116 | return true; | |
2117 | ||
2118 | if (is_inode_writable(cifsInode)) { | |
2119 | /* This inode is open for write at least once */ | |
2120 | struct cifs_sb_info *cifs_sb; | |
2121 | ||
2122 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); | |
2123 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { | |
2124 | /* since no page cache to corrupt on directio | |
2125 | we can change size safely */ | |
2126 | return true; | |
2127 | } | |
2128 | ||
2129 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) | |
2130 | return true; | |
2131 | ||
2132 | return false; | |
2133 | } else | |
2134 | return true; | |
2135 | } | |
2136 | ||
2137 | static int cifs_write_begin(struct file *file, struct address_space *mapping, | |
2138 | loff_t pos, unsigned len, unsigned flags, | |
2139 | struct page **pagep, void **fsdata) | |
2140 | { | |
2141 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
2142 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
2143 | loff_t page_start = pos & PAGE_MASK; | |
2144 | loff_t i_size; | |
2145 | struct page *page; | |
2146 | int rc = 0; | |
2147 | ||
2148 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); | |
2149 | ||
2150 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2151 | if (!page) { | |
2152 | rc = -ENOMEM; | |
2153 | goto out; | |
2154 | } | |
2155 | ||
2156 | if (PageUptodate(page)) | |
2157 | goto out; | |
2158 | ||
2159 | /* | |
2160 | * If we write a full page it will be up to date, no need to read from | |
2161 | * the server. If the write is short, we'll end up doing a sync write | |
2162 | * instead. | |
2163 | */ | |
2164 | if (len == PAGE_CACHE_SIZE) | |
2165 | goto out; | |
2166 | ||
2167 | /* | |
2168 | * optimize away the read when we have an oplock, and we're not | |
2169 | * expecting to use any of the data we'd be reading in. That | |
2170 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2171 | * and the write will cover all of the existing data. | |
2172 | */ | |
2173 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2174 | i_size = i_size_read(mapping->host); | |
2175 | if (page_start >= i_size || | |
2176 | (offset == 0 && (pos + len) >= i_size)) { | |
2177 | zero_user_segments(page, 0, offset, | |
2178 | offset + len, | |
2179 | PAGE_CACHE_SIZE); | |
2180 | /* | |
2181 | * PageChecked means that the parts of the page | |
2182 | * to which we're not writing are considered up | |
2183 | * to date. Once the data is copied to the | |
2184 | * page, it can be set uptodate. | |
2185 | */ | |
2186 | SetPageChecked(page); | |
2187 | goto out; | |
2188 | } | |
2189 | } | |
2190 | ||
2191 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
2192 | /* | |
2193 | * might as well read a page, it is fast enough. If we get | |
2194 | * an error, we don't need to return it. cifs_write_end will | |
2195 | * do a sync write instead since PG_uptodate isn't set. | |
2196 | */ | |
2197 | cifs_readpage_worker(file, page, &page_start); | |
2198 | } else { | |
2199 | /* we could try using another file handle if there is one - | |
2200 | but how would we lock it to prevent close of that handle | |
2201 | racing with this read? In any case | |
2202 | this will be written out by write_end so is fine */ | |
2203 | } | |
2204 | out: | |
2205 | *pagep = page; | |
2206 | return rc; | |
2207 | } | |
2208 | ||
2209 | static int cifs_release_page(struct page *page, gfp_t gfp) | |
2210 | { | |
2211 | if (PagePrivate(page)) | |
2212 | return 0; | |
2213 | ||
2214 | return cifs_fscache_release_page(page, gfp); | |
2215 | } | |
2216 | ||
2217 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2218 | { | |
2219 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2220 | ||
2221 | if (offset == 0) | |
2222 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2223 | } | |
2224 | ||
2225 | void cifs_oplock_break(struct work_struct *work) | |
2226 | { | |
2227 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2228 | oplock_break); | |
2229 | struct inode *inode = cfile->dentry->d_inode; | |
2230 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2231 | int rc = 0; | |
2232 | ||
2233 | if (inode && S_ISREG(inode->i_mode)) { | |
2234 | if (cinode->clientCanCacheRead) | |
2235 | break_lease(inode, O_RDONLY); | |
2236 | else | |
2237 | break_lease(inode, O_WRONLY); | |
2238 | rc = filemap_fdatawrite(inode->i_mapping); | |
2239 | if (cinode->clientCanCacheRead == 0) { | |
2240 | rc = filemap_fdatawait(inode->i_mapping); | |
2241 | mapping_set_error(inode->i_mapping, rc); | |
2242 | invalidate_remote_inode(inode); | |
2243 | } | |
2244 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * releasing stale oplock after recent reconnect of smb session using | |
2249 | * a now incorrect file handle is not a data integrity issue but do | |
2250 | * not bother sending an oplock release if session to server still is | |
2251 | * disconnected since oplock already released by the server | |
2252 | */ | |
2253 | if (!cfile->oplock_break_cancelled) { | |
2254 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, | |
2255 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
2256 | cFYI(1, "Oplock release rc = %d", rc); | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * We might have kicked in before is_valid_oplock_break() | |
2261 | * finished grabbing reference for us. Make sure it's done by | |
2262 | * waiting for cifs_file_list_lock. | |
2263 | */ | |
2264 | spin_lock(&cifs_file_list_lock); | |
2265 | spin_unlock(&cifs_file_list_lock); | |
2266 | ||
2267 | cifs_oplock_break_put(cfile); | |
2268 | } | |
2269 | ||
2270 | /* must be called while holding cifs_file_list_lock */ | |
2271 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) | |
2272 | { | |
2273 | cifs_sb_active(cfile->dentry->d_sb); | |
2274 | cifsFileInfo_get(cfile); | |
2275 | } | |
2276 | ||
2277 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) | |
2278 | { | |
2279 | cifsFileInfo_put(cfile); | |
2280 | cifs_sb_deactive(cfile->dentry->d_sb); | |
2281 | } | |
2282 | ||
2283 | const struct address_space_operations cifs_addr_ops = { | |
2284 | .readpage = cifs_readpage, | |
2285 | .readpages = cifs_readpages, | |
2286 | .writepage = cifs_writepage, | |
2287 | .writepages = cifs_writepages, | |
2288 | .write_begin = cifs_write_begin, | |
2289 | .write_end = cifs_write_end, | |
2290 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2291 | .releasepage = cifs_release_page, | |
2292 | .invalidatepage = cifs_invalidate_page, | |
2293 | /* .sync_page = cifs_sync_page, */ | |
2294 | /* .direct_IO = */ | |
2295 | }; | |
2296 | ||
2297 | /* | |
2298 | * cifs_readpages requires the server to support a buffer large enough to | |
2299 | * contain the header plus one complete page of data. Otherwise, we need | |
2300 | * to leave cifs_readpages out of the address space operations. | |
2301 | */ | |
2302 | const struct address_space_operations cifs_addr_ops_smallbuf = { | |
2303 | .readpage = cifs_readpage, | |
2304 | .writepage = cifs_writepage, | |
2305 | .writepages = cifs_writepages, | |
2306 | .write_begin = cifs_write_begin, | |
2307 | .write_end = cifs_write_end, | |
2308 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2309 | .releasepage = cifs_release_page, | |
2310 | .invalidatepage = cifs_invalidate_page, | |
2311 | /* .sync_page = cifs_sync_page, */ | |
2312 | /* .direct_IO = */ | |
2313 | }; |