Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
5 | * | |
6 | * Copyright (C) International Business Machines Corp., 2002,2003 | |
7 | * Author(s): Steve French (sfrench@us.ibm.com) | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU Lesser General Public License as published | |
11 | * by the Free Software Foundation; either version 2.1 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
17 | * the GNU Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public License | |
20 | * along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | #include <linux/fs.h> | |
24 | #include <linux/stat.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/pagemap.h> | |
27 | #include <linux/pagevec.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <asm/div64.h> | |
30 | #include "cifsfs.h" | |
31 | #include "cifspdu.h" | |
32 | #include "cifsglob.h" | |
33 | #include "cifsproto.h" | |
34 | #include "cifs_unicode.h" | |
35 | #include "cifs_debug.h" | |
36 | #include "cifs_fs_sb.h" | |
37 | ||
38 | static inline struct cifsFileInfo *cifs_init_private( | |
39 | struct cifsFileInfo *private_data, struct inode *inode, | |
40 | struct file *file, __u16 netfid) | |
41 | { | |
42 | memset(private_data, 0, sizeof(struct cifsFileInfo)); | |
43 | private_data->netfid = netfid; | |
44 | private_data->pid = current->tgid; | |
45 | init_MUTEX(&private_data->fh_sem); | |
46 | private_data->pfile = file; /* needed for writepage */ | |
47 | private_data->pInode = inode; | |
48 | private_data->invalidHandle = FALSE; | |
49 | private_data->closePend = FALSE; | |
50 | ||
51 | return private_data; | |
52 | } | |
53 | ||
54 | static inline int cifs_convert_flags(unsigned int flags) | |
55 | { | |
56 | if ((flags & O_ACCMODE) == O_RDONLY) | |
57 | return GENERIC_READ; | |
58 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
59 | return GENERIC_WRITE; | |
60 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
61 | /* GENERIC_ALL is too much permission to request | |
62 | can cause unnecessary access denied on create */ | |
63 | /* return GENERIC_ALL; */ | |
64 | return (GENERIC_READ | GENERIC_WRITE); | |
65 | } | |
66 | ||
67 | return 0x20197; | |
68 | } | |
69 | ||
70 | static inline int cifs_get_disposition(unsigned int flags) | |
71 | { | |
72 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
73 | return FILE_CREATE; | |
74 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
75 | return FILE_OVERWRITE_IF; | |
76 | else if ((flags & O_CREAT) == O_CREAT) | |
77 | return FILE_OPEN_IF; | |
78 | else | |
79 | return FILE_OPEN; | |
80 | } | |
81 | ||
82 | /* all arguments to this function must be checked for validity in caller */ | |
83 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
84 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
85 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
86 | char *full_path, int xid) | |
87 | { | |
88 | struct timespec temp; | |
89 | int rc; | |
90 | ||
91 | /* want handles we can use to read with first | |
92 | in the list so we do not have to walk the | |
93 | list to search for one in prepare_write */ | |
94 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
95 | list_add_tail(&pCifsFile->flist, | |
96 | &pCifsInode->openFileList); | |
97 | } else { | |
98 | list_add(&pCifsFile->flist, | |
99 | &pCifsInode->openFileList); | |
100 | } | |
101 | write_unlock(&GlobalSMBSeslock); | |
102 | write_unlock(&file->f_owner.lock); | |
103 | if (pCifsInode->clientCanCacheRead) { | |
104 | /* we have the inode open somewhere else | |
105 | no need to discard cache data */ | |
106 | goto client_can_cache; | |
107 | } | |
108 | ||
109 | /* BB need same check in cifs_create too? */ | |
110 | /* if not oplocked, invalidate inode pages if mtime or file | |
111 | size changed */ | |
112 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
113 | if (timespec_equal(&file->f_dentry->d_inode->i_mtime, &temp) && | |
114 | (file->f_dentry->d_inode->i_size == | |
115 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
116 | cFYI(1, ("inode unchanged on server")); | |
117 | } else { | |
118 | if (file->f_dentry->d_inode->i_mapping) { | |
119 | /* BB no need to lock inode until after invalidate | |
120 | since namei code should already have it locked? */ | |
121 | filemap_fdatawrite(file->f_dentry->d_inode->i_mapping); | |
122 | filemap_fdatawait(file->f_dentry->d_inode->i_mapping); | |
123 | } | |
124 | cFYI(1, ("invalidating remote inode since open detected it " | |
125 | "changed")); | |
126 | invalidate_remote_inode(file->f_dentry->d_inode); | |
127 | } | |
128 | ||
129 | client_can_cache: | |
130 | if (pTcon->ses->capabilities & CAP_UNIX) | |
131 | rc = cifs_get_inode_info_unix(&file->f_dentry->d_inode, | |
132 | full_path, inode->i_sb, xid); | |
133 | else | |
134 | rc = cifs_get_inode_info(&file->f_dentry->d_inode, | |
135 | full_path, buf, inode->i_sb, xid); | |
136 | ||
137 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
138 | pCifsInode->clientCanCacheAll = TRUE; | |
139 | pCifsInode->clientCanCacheRead = TRUE; | |
140 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
141 | file->f_dentry->d_inode)); | |
142 | } else if ((*oplock & 0xF) == OPLOCK_READ) | |
143 | pCifsInode->clientCanCacheRead = TRUE; | |
144 | ||
145 | return rc; | |
146 | } | |
147 | ||
148 | int cifs_open(struct inode *inode, struct file *file) | |
149 | { | |
150 | int rc = -EACCES; | |
151 | int xid, oplock; | |
152 | struct cifs_sb_info *cifs_sb; | |
153 | struct cifsTconInfo *pTcon; | |
154 | struct cifsFileInfo *pCifsFile; | |
155 | struct cifsInodeInfo *pCifsInode; | |
156 | struct list_head *tmp; | |
157 | char *full_path = NULL; | |
158 | int desiredAccess; | |
159 | int disposition; | |
160 | __u16 netfid; | |
161 | FILE_ALL_INFO *buf = NULL; | |
162 | ||
163 | xid = GetXid(); | |
164 | ||
165 | cifs_sb = CIFS_SB(inode->i_sb); | |
166 | pTcon = cifs_sb->tcon; | |
167 | ||
168 | if (file->f_flags & O_CREAT) { | |
169 | /* search inode for this file and fill in file->private_data */ | |
170 | pCifsInode = CIFS_I(file->f_dentry->d_inode); | |
171 | read_lock(&GlobalSMBSeslock); | |
172 | list_for_each(tmp, &pCifsInode->openFileList) { | |
173 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
174 | flist); | |
175 | if ((pCifsFile->pfile == NULL) && | |
176 | (pCifsFile->pid == current->tgid)) { | |
177 | /* mode set in cifs_create */ | |
178 | ||
179 | /* needed for writepage */ | |
180 | pCifsFile->pfile = file; | |
181 | ||
182 | file->private_data = pCifsFile; | |
183 | break; | |
184 | } | |
185 | } | |
186 | read_unlock(&GlobalSMBSeslock); | |
187 | if (file->private_data != NULL) { | |
188 | rc = 0; | |
189 | FreeXid(xid); | |
190 | return rc; | |
191 | } else { | |
192 | if (file->f_flags & O_EXCL) | |
193 | cERROR(1, ("could not find file instance for " | |
194 | "new file %p ", file)); | |
195 | } | |
196 | } | |
197 | ||
198 | down(&inode->i_sb->s_vfs_rename_sem); | |
199 | full_path = build_path_from_dentry(file->f_dentry); | |
200 | up(&inode->i_sb->s_vfs_rename_sem); | |
201 | if (full_path == NULL) { | |
202 | FreeXid(xid); | |
203 | return -ENOMEM; | |
204 | } | |
205 | ||
206 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
207 | inode, file->f_flags, full_path)); | |
208 | desiredAccess = cifs_convert_flags(file->f_flags); | |
209 | ||
210 | /********************************************************************* | |
211 | * open flag mapping table: | |
212 | * | |
213 | * POSIX Flag CIFS Disposition | |
214 | * ---------- ---------------- | |
215 | * O_CREAT FILE_OPEN_IF | |
216 | * O_CREAT | O_EXCL FILE_CREATE | |
217 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
218 | * O_TRUNC FILE_OVERWRITE | |
219 | * none of the above FILE_OPEN | |
220 | * | |
221 | * Note that there is not a direct match between disposition | |
222 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
223 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
224 | * file rather than creating a new file as FILE_SUPERSEDE does | |
225 | * (which uses the attributes / metadata passed in on open call) | |
226 | *? | |
227 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
228 | *? and the read write flags match reasonably. O_LARGEFILE | |
229 | *? is irrelevant because largefile support is always used | |
230 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
231 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
232 | *********************************************************************/ | |
233 | ||
234 | disposition = cifs_get_disposition(file->f_flags); | |
235 | ||
236 | if (oplockEnabled) | |
237 | oplock = REQ_OPLOCK; | |
238 | else | |
239 | oplock = FALSE; | |
240 | ||
241 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
242 | ||
243 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
244 | and calling get_inode_info with returned buf (at least helps | |
245 | non-Unix server case) */ | |
246 | ||
247 | /* BB we can not do this if this is the second open of a file | |
248 | and the first handle has writebehind data, we might be | |
249 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ | |
250 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
251 | if (!buf) { | |
252 | rc = -ENOMEM; | |
253 | goto out; | |
254 | } | |
255 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, | |
256 | CREATE_NOT_DIR, &netfid, &oplock, buf, | |
737b758c SF |
257 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
258 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
259 | if (rc) { |
260 | cFYI(1, ("cifs_open returned 0x%x ", rc)); | |
261 | goto out; | |
262 | } | |
263 | file->private_data = | |
264 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
265 | if (file->private_data == NULL) { | |
266 | rc = -ENOMEM; | |
267 | goto out; | |
268 | } | |
269 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
270 | write_lock(&file->f_owner.lock); | |
271 | write_lock(&GlobalSMBSeslock); | |
272 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
273 | ||
274 | pCifsInode = CIFS_I(file->f_dentry->d_inode); | |
275 | if (pCifsInode) { | |
276 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
277 | pCifsFile, pTcon, | |
278 | &oplock, buf, full_path, xid); | |
279 | } else { | |
280 | write_unlock(&GlobalSMBSeslock); | |
281 | write_unlock(&file->f_owner.lock); | |
282 | } | |
283 | ||
284 | if (oplock & CIFS_CREATE_ACTION) { | |
285 | /* time to set mode which we can not set earlier due to | |
286 | problems creating new read-only files */ | |
287 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) { | |
288 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, | |
289 | inode->i_mode, | |
290 | (__u64)-1, (__u64)-1, 0 /* dev */, | |
737b758c SF |
291 | cifs_sb->local_nls, |
292 | cifs_sb->mnt_cifs_flags & | |
293 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
294 | } else { |
295 | /* BB implement via Windows security descriptors eg | |
296 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, | |
297 | -1, -1, local_nls); | |
298 | in the meantime could set r/o dos attribute when | |
299 | perms are eg: mode & 0222 == 0 */ | |
300 | } | |
301 | } | |
302 | ||
303 | out: | |
304 | kfree(buf); | |
305 | kfree(full_path); | |
306 | FreeXid(xid); | |
307 | return rc; | |
308 | } | |
309 | ||
310 | /* Try to reaquire byte range locks that were released when session */ | |
311 | /* to server was lost */ | |
312 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
313 | { | |
314 | int rc = 0; | |
315 | ||
316 | /* BB list all locks open on this file and relock */ | |
317 | ||
318 | return rc; | |
319 | } | |
320 | ||
321 | static int cifs_reopen_file(struct inode *inode, struct file *file, | |
322 | int can_flush) | |
323 | { | |
324 | int rc = -EACCES; | |
325 | int xid, oplock; | |
326 | struct cifs_sb_info *cifs_sb; | |
327 | struct cifsTconInfo *pTcon; | |
328 | struct cifsFileInfo *pCifsFile; | |
329 | struct cifsInodeInfo *pCifsInode; | |
330 | char *full_path = NULL; | |
331 | int desiredAccess; | |
332 | int disposition = FILE_OPEN; | |
333 | __u16 netfid; | |
334 | ||
335 | if (inode == NULL) | |
336 | return -EBADF; | |
337 | if (file->private_data) { | |
338 | pCifsFile = (struct cifsFileInfo *)file->private_data; | |
339 | } else | |
340 | return -EBADF; | |
341 | ||
342 | xid = GetXid(); | |
343 | down(&pCifsFile->fh_sem); | |
344 | if (pCifsFile->invalidHandle == FALSE) { | |
345 | up(&pCifsFile->fh_sem); | |
346 | FreeXid(xid); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | if (file->f_dentry == NULL) { | |
351 | up(&pCifsFile->fh_sem); | |
352 | cFYI(1, ("failed file reopen, no valid name if dentry freed")); | |
353 | FreeXid(xid); | |
354 | return -EBADF; | |
355 | } | |
356 | cifs_sb = CIFS_SB(inode->i_sb); | |
357 | pTcon = cifs_sb->tcon; | |
358 | /* can not grab rename sem here because various ops, including | |
359 | those that already have the rename sem can end up causing writepage | |
360 | to get called and if the server was down that means we end up here, | |
361 | and we can never tell if the caller already has the rename_sem */ | |
362 | full_path = build_path_from_dentry(file->f_dentry); | |
363 | if (full_path == NULL) { | |
364 | up(&pCifsFile->fh_sem); | |
365 | FreeXid(xid); | |
366 | return -ENOMEM; | |
367 | } | |
368 | ||
369 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
370 | inode, file->f_flags,full_path)); | |
371 | desiredAccess = cifs_convert_flags(file->f_flags); | |
372 | ||
373 | if (oplockEnabled) | |
374 | oplock = REQ_OPLOCK; | |
375 | else | |
376 | oplock = FALSE; | |
377 | ||
378 | /* Can not refresh inode by passing in file_info buf to be returned | |
379 | by SMBOpen and then calling get_inode_info with returned buf | |
380 | since file might have write behind data that needs to be flushed | |
381 | and server version of file size can be stale. If we knew for sure | |
382 | that inode was not dirty locally we could do this */ | |
383 | ||
384 | /* buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
385 | if (buf == 0) { | |
386 | up(&pCifsFile->fh_sem); | |
387 | kfree(full_path); | |
388 | FreeXid(xid); | |
389 | return -ENOMEM; | |
390 | } */ | |
391 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, | |
392 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
737b758c SF |
393 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
394 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
395 | if (rc) { |
396 | up(&pCifsFile->fh_sem); | |
397 | cFYI(1, ("cifs_open returned 0x%x ", rc)); | |
398 | cFYI(1, ("oplock: %d ", oplock)); | |
399 | } else { | |
400 | pCifsFile->netfid = netfid; | |
401 | pCifsFile->invalidHandle = FALSE; | |
402 | up(&pCifsFile->fh_sem); | |
403 | pCifsInode = CIFS_I(inode); | |
404 | if (pCifsInode) { | |
405 | if (can_flush) { | |
406 | filemap_fdatawrite(inode->i_mapping); | |
407 | filemap_fdatawait(inode->i_mapping); | |
408 | /* temporarily disable caching while we | |
409 | go to server to get inode info */ | |
410 | pCifsInode->clientCanCacheAll = FALSE; | |
411 | pCifsInode->clientCanCacheRead = FALSE; | |
412 | if (pTcon->ses->capabilities & CAP_UNIX) | |
413 | rc = cifs_get_inode_info_unix(&inode, | |
414 | full_path, inode->i_sb, xid); | |
415 | else | |
416 | rc = cifs_get_inode_info(&inode, | |
417 | full_path, NULL, inode->i_sb, | |
418 | xid); | |
419 | } /* else we are writing out data to server already | |
420 | and could deadlock if we tried to flush data, and | |
421 | since we do not know if we have data that would | |
422 | invalidate the current end of file on the server | |
423 | we can not go to the server to get the new inod | |
424 | info */ | |
425 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
426 | pCifsInode->clientCanCacheAll = TRUE; | |
427 | pCifsInode->clientCanCacheRead = TRUE; | |
428 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
429 | file->f_dentry->d_inode)); | |
430 | } else if ((oplock & 0xF) == OPLOCK_READ) { | |
431 | pCifsInode->clientCanCacheRead = TRUE; | |
432 | pCifsInode->clientCanCacheAll = FALSE; | |
433 | } else { | |
434 | pCifsInode->clientCanCacheRead = FALSE; | |
435 | pCifsInode->clientCanCacheAll = FALSE; | |
436 | } | |
437 | cifs_relock_file(pCifsFile); | |
438 | } | |
439 | } | |
440 | ||
441 | kfree(full_path); | |
442 | FreeXid(xid); | |
443 | return rc; | |
444 | } | |
445 | ||
446 | int cifs_close(struct inode *inode, struct file *file) | |
447 | { | |
448 | int rc = 0; | |
449 | int xid; | |
450 | struct cifs_sb_info *cifs_sb; | |
451 | struct cifsTconInfo *pTcon; | |
452 | struct cifsFileInfo *pSMBFile = | |
453 | (struct cifsFileInfo *)file->private_data; | |
454 | ||
455 | xid = GetXid(); | |
456 | ||
457 | cifs_sb = CIFS_SB(inode->i_sb); | |
458 | pTcon = cifs_sb->tcon; | |
459 | if (pSMBFile) { | |
460 | pSMBFile->closePend = TRUE; | |
461 | write_lock(&file->f_owner.lock); | |
462 | if (pTcon) { | |
463 | /* no sense reconnecting to close a file that is | |
464 | already closed */ | |
465 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
466 | write_unlock(&file->f_owner.lock); | |
467 | rc = CIFSSMBClose(xid, pTcon, | |
468 | pSMBFile->netfid); | |
469 | write_lock(&file->f_owner.lock); | |
470 | } | |
471 | } | |
cbe0476f | 472 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
473 | list_del(&pSMBFile->flist); |
474 | list_del(&pSMBFile->tlist); | |
cbe0476f | 475 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
476 | write_unlock(&file->f_owner.lock); |
477 | kfree(pSMBFile->search_resume_name); | |
478 | kfree(file->private_data); | |
479 | file->private_data = NULL; | |
480 | } else | |
481 | rc = -EBADF; | |
482 | ||
483 | if (list_empty(&(CIFS_I(inode)->openFileList))) { | |
484 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
485 | /* if the file is not open we do not know if we can cache info | |
486 | on this inode, much less write behind and read ahead */ | |
487 | CIFS_I(inode)->clientCanCacheRead = FALSE; | |
488 | CIFS_I(inode)->clientCanCacheAll = FALSE; | |
489 | } | |
490 | if ((rc ==0) && CIFS_I(inode)->write_behind_rc) | |
491 | rc = CIFS_I(inode)->write_behind_rc; | |
492 | FreeXid(xid); | |
493 | return rc; | |
494 | } | |
495 | ||
496 | int cifs_closedir(struct inode *inode, struct file *file) | |
497 | { | |
498 | int rc = 0; | |
499 | int xid; | |
500 | struct cifsFileInfo *pCFileStruct = | |
501 | (struct cifsFileInfo *)file->private_data; | |
502 | char *ptmp; | |
503 | ||
504 | cFYI(1, ("Closedir inode = 0x%p with ", inode)); | |
505 | ||
506 | xid = GetXid(); | |
507 | ||
508 | if (pCFileStruct) { | |
509 | struct cifsTconInfo *pTcon; | |
510 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
511 | ||
512 | pTcon = cifs_sb->tcon; | |
513 | ||
514 | cFYI(1, ("Freeing private data in close dir")); | |
515 | if (pCFileStruct->srch_inf.endOfSearch == FALSE) { | |
516 | pCFileStruct->invalidHandle = TRUE; | |
517 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
518 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
519 | rc)); | |
520 | /* not much we can do if it fails anyway, ignore rc */ | |
521 | rc = 0; | |
522 | } | |
523 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
524 | if (ptmp) { | |
525 | /* BB removeme BB */ cFYI(1, ("freeing smb buf in srch struct in closedir")); | |
526 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; | |
527 | cifs_buf_release(ptmp); | |
528 | } | |
529 | ptmp = pCFileStruct->search_resume_name; | |
530 | if (ptmp) { | |
531 | /* BB removeme BB */ cFYI(1, ("freeing resume name in closedir")); | |
532 | pCFileStruct->search_resume_name = NULL; | |
533 | kfree(ptmp); | |
534 | } | |
535 | kfree(file->private_data); | |
536 | file->private_data = NULL; | |
537 | } | |
538 | /* BB can we lock the filestruct while this is going on? */ | |
539 | FreeXid(xid); | |
540 | return rc; | |
541 | } | |
542 | ||
543 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) | |
544 | { | |
545 | int rc, xid; | |
546 | __u32 lockType = LOCKING_ANDX_LARGE_FILES; | |
547 | __u32 numLock = 0; | |
548 | __u32 numUnlock = 0; | |
549 | __u64 length; | |
550 | int wait_flag = FALSE; | |
551 | struct cifs_sb_info *cifs_sb; | |
552 | struct cifsTconInfo *pTcon; | |
553 | ||
554 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
555 | rc = -EACCES; | |
556 | xid = GetXid(); | |
557 | ||
558 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
559 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
560 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, | |
561 | pfLock->fl_end)); | |
562 | ||
563 | if (pfLock->fl_flags & FL_POSIX) | |
564 | cFYI(1, ("Posix ")); | |
565 | if (pfLock->fl_flags & FL_FLOCK) | |
566 | cFYI(1, ("Flock ")); | |
567 | if (pfLock->fl_flags & FL_SLEEP) { | |
568 | cFYI(1, ("Blocking lock ")); | |
569 | wait_flag = TRUE; | |
570 | } | |
571 | if (pfLock->fl_flags & FL_ACCESS) | |
572 | cFYI(1, ("Process suspended by mandatory locking - " | |
573 | "not implemented yet ")); | |
574 | if (pfLock->fl_flags & FL_LEASE) | |
575 | cFYI(1, ("Lease on file - not implemented yet")); | |
576 | if (pfLock->fl_flags & | |
577 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) | |
578 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
579 | ||
580 | if (pfLock->fl_type == F_WRLCK) { | |
581 | cFYI(1, ("F_WRLCK ")); | |
582 | numLock = 1; | |
583 | } else if (pfLock->fl_type == F_UNLCK) { | |
584 | cFYI(1, ("F_UNLCK ")); | |
585 | numUnlock = 1; | |
586 | } else if (pfLock->fl_type == F_RDLCK) { | |
587 | cFYI(1, ("F_RDLCK ")); | |
588 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
589 | numLock = 1; | |
590 | } else if (pfLock->fl_type == F_EXLCK) { | |
591 | cFYI(1, ("F_EXLCK ")); | |
592 | numLock = 1; | |
593 | } else if (pfLock->fl_type == F_SHLCK) { | |
594 | cFYI(1, ("F_SHLCK ")); | |
595 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
596 | numLock = 1; | |
597 | } else | |
598 | cFYI(1, ("Unknown type of lock ")); | |
599 | ||
600 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
601 | pTcon = cifs_sb->tcon; | |
602 | ||
603 | if (file->private_data == NULL) { | |
604 | FreeXid(xid); | |
605 | return -EBADF; | |
606 | } | |
607 | ||
608 | if (IS_GETLK(cmd)) { | |
609 | rc = CIFSSMBLock(xid, pTcon, | |
610 | ((struct cifsFileInfo *)file-> | |
611 | private_data)->netfid, | |
612 | length, | |
613 | pfLock->fl_start, 0, 1, lockType, | |
614 | 0 /* wait flag */ ); | |
615 | if (rc == 0) { | |
616 | rc = CIFSSMBLock(xid, pTcon, | |
617 | ((struct cifsFileInfo *) file-> | |
618 | private_data)->netfid, | |
619 | length, | |
620 | pfLock->fl_start, 1 /* numUnlock */ , | |
621 | 0 /* numLock */ , lockType, | |
622 | 0 /* wait flag */ ); | |
623 | pfLock->fl_type = F_UNLCK; | |
624 | if (rc != 0) | |
625 | cERROR(1, ("Error unlocking previously locked " | |
626 | "range %d during test of lock ", | |
627 | rc)); | |
628 | rc = 0; | |
629 | ||
630 | } else { | |
631 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
632 | rc = 0; /* do not change lock type to unlock | |
633 | since range in use */ | |
634 | } | |
635 | ||
636 | FreeXid(xid); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | rc = CIFSSMBLock(xid, pTcon, | |
641 | ((struct cifsFileInfo *) file->private_data)-> | |
642 | netfid, length, | |
643 | pfLock->fl_start, numUnlock, numLock, lockType, | |
644 | wait_flag); | |
645 | if (rc == 0 && (pfLock->fl_flags & FL_POSIX)) | |
646 | posix_lock_file_wait(file, pfLock); | |
647 | FreeXid(xid); | |
648 | return rc; | |
649 | } | |
650 | ||
651 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
652 | size_t write_size, loff_t *poffset) | |
653 | { | |
654 | int rc = 0; | |
655 | unsigned int bytes_written = 0; | |
656 | unsigned int total_written; | |
657 | struct cifs_sb_info *cifs_sb; | |
658 | struct cifsTconInfo *pTcon; | |
659 | int xid, long_op; | |
660 | struct cifsFileInfo *open_file; | |
661 | ||
662 | if (file->f_dentry == NULL) | |
663 | return -EBADF; | |
664 | ||
665 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
666 | if (cifs_sb == NULL) | |
667 | return -EBADF; | |
668 | ||
669 | pTcon = cifs_sb->tcon; | |
670 | ||
671 | /* cFYI(1, | |
672 | (" write %d bytes to offset %lld of %s", write_size, | |
673 | *poffset, file->f_dentry->d_name.name)); */ | |
674 | ||
675 | if (file->private_data == NULL) | |
676 | return -EBADF; | |
677 | else | |
678 | open_file = (struct cifsFileInfo *) file->private_data; | |
679 | ||
680 | xid = GetXid(); | |
681 | if (file->f_dentry->d_inode == NULL) { | |
682 | FreeXid(xid); | |
683 | return -EBADF; | |
684 | } | |
685 | ||
686 | if (*poffset > file->f_dentry->d_inode->i_size) | |
687 | long_op = 2; /* writes past end of file can take a long time */ | |
688 | else | |
689 | long_op = 1; | |
690 | ||
691 | for (total_written = 0; write_size > total_written; | |
692 | total_written += bytes_written) { | |
693 | rc = -EAGAIN; | |
694 | while (rc == -EAGAIN) { | |
695 | if (file->private_data == NULL) { | |
696 | /* file has been closed on us */ | |
697 | FreeXid(xid); | |
698 | /* if we have gotten here we have written some data | |
699 | and blocked, and the file has been freed on us while | |
700 | we blocked so return what we managed to write */ | |
701 | return total_written; | |
702 | } | |
703 | if (open_file->closePend) { | |
704 | FreeXid(xid); | |
705 | if (total_written) | |
706 | return total_written; | |
707 | else | |
708 | return -EBADF; | |
709 | } | |
710 | if (open_file->invalidHandle) { | |
711 | if ((file->f_dentry == NULL) || | |
712 | (file->f_dentry->d_inode == NULL)) { | |
713 | FreeXid(xid); | |
714 | return total_written; | |
715 | } | |
716 | /* we could deadlock if we called | |
717 | filemap_fdatawait from here so tell | |
718 | reopen_file not to flush data to server | |
719 | now */ | |
720 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
721 | file, FALSE); | |
722 | if (rc != 0) | |
723 | break; | |
724 | } | |
725 | ||
726 | rc = CIFSSMBWrite(xid, pTcon, | |
727 | open_file->netfid, | |
728 | min_t(const int, cifs_sb->wsize, | |
729 | write_size - total_written), | |
730 | *poffset, &bytes_written, | |
731 | NULL, write_data + total_written, long_op); | |
732 | } | |
733 | if (rc || (bytes_written == 0)) { | |
734 | if (total_written) | |
735 | break; | |
736 | else { | |
737 | FreeXid(xid); | |
738 | return rc; | |
739 | } | |
740 | } else | |
741 | *poffset += bytes_written; | |
742 | long_op = FALSE; /* subsequent writes fast - | |
743 | 15 seconds is plenty */ | |
744 | } | |
745 | ||
746 | #ifdef CONFIG_CIFS_STATS | |
747 | if (total_written > 0) { | |
748 | atomic_inc(&pTcon->num_writes); | |
749 | spin_lock(&pTcon->stat_lock); | |
750 | pTcon->bytes_written += total_written; | |
751 | spin_unlock(&pTcon->stat_lock); | |
752 | } | |
753 | #endif | |
754 | ||
755 | /* since the write may have blocked check these pointers again */ | |
756 | if (file->f_dentry) { | |
757 | if (file->f_dentry->d_inode) { | |
758 | struct inode *inode = file->f_dentry->d_inode; | |
759 | inode->i_ctime = inode->i_mtime = | |
760 | current_fs_time(inode->i_sb); | |
761 | if (total_written > 0) { | |
762 | if (*poffset > file->f_dentry->d_inode->i_size) | |
763 | i_size_write(file->f_dentry->d_inode, | |
764 | *poffset); | |
765 | } | |
766 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
767 | } | |
768 | } | |
769 | FreeXid(xid); | |
770 | return total_written; | |
771 | } | |
772 | ||
773 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
774 | size_t write_size, loff_t *poffset) | |
775 | { | |
776 | int rc = 0; | |
777 | unsigned int bytes_written = 0; | |
778 | unsigned int total_written; | |
779 | struct cifs_sb_info *cifs_sb; | |
780 | struct cifsTconInfo *pTcon; | |
781 | int xid, long_op; | |
782 | struct cifsFileInfo *open_file; | |
783 | ||
784 | if (file->f_dentry == NULL) | |
785 | return -EBADF; | |
786 | ||
787 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
788 | if (cifs_sb == NULL) | |
789 | return -EBADF; | |
790 | ||
791 | pTcon = cifs_sb->tcon; | |
792 | ||
793 | /* cFYI(1, | |
794 | (" write %d bytes to offset %lld of %s", write_size, | |
795 | *poffset, file->f_dentry->d_name.name)); */ | |
796 | ||
797 | if (file->private_data == NULL) | |
798 | return -EBADF; | |
799 | else | |
800 | open_file = (struct cifsFileInfo *)file->private_data; | |
801 | ||
802 | xid = GetXid(); | |
803 | if (file->f_dentry->d_inode == NULL) { | |
804 | FreeXid(xid); | |
805 | return -EBADF; | |
806 | } | |
807 | ||
808 | if (*poffset > file->f_dentry->d_inode->i_size) | |
809 | long_op = 2; /* writes past end of file can take a long time */ | |
810 | else | |
811 | long_op = 1; | |
812 | ||
813 | for (total_written = 0; write_size > total_written; | |
814 | total_written += bytes_written) { | |
815 | rc = -EAGAIN; | |
816 | while (rc == -EAGAIN) { | |
817 | if (file->private_data == NULL) { | |
818 | /* file has been closed on us */ | |
819 | FreeXid(xid); | |
820 | /* if we have gotten here we have written some data | |
821 | and blocked, and the file has been freed on us | |
822 | while we blocked so return what we managed to | |
823 | write */ | |
824 | return total_written; | |
825 | } | |
826 | if (open_file->closePend) { | |
827 | FreeXid(xid); | |
828 | if (total_written) | |
829 | return total_written; | |
830 | else | |
831 | return -EBADF; | |
832 | } | |
833 | if (open_file->invalidHandle) { | |
834 | if ((file->f_dentry == NULL) || | |
835 | (file->f_dentry->d_inode == NULL)) { | |
836 | FreeXid(xid); | |
837 | return total_written; | |
838 | } | |
839 | /* we could deadlock if we called | |
840 | filemap_fdatawait from here so tell | |
841 | reopen_file not to flush data to | |
842 | server now */ | |
843 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
844 | file, FALSE); | |
845 | if (rc != 0) | |
846 | break; | |
847 | } | |
848 | ||
849 | rc = CIFSSMBWrite(xid, pTcon, | |
850 | open_file->netfid, | |
851 | min_t(const int, cifs_sb->wsize, | |
852 | write_size - total_written), | |
853 | *poffset, &bytes_written, | |
854 | write_data + total_written, NULL, long_op); | |
855 | } | |
856 | if (rc || (bytes_written == 0)) { | |
857 | if (total_written) | |
858 | break; | |
859 | else { | |
860 | FreeXid(xid); | |
861 | return rc; | |
862 | } | |
863 | } else | |
864 | *poffset += bytes_written; | |
865 | long_op = FALSE; /* subsequent writes fast - | |
866 | 15 seconds is plenty */ | |
867 | } | |
868 | ||
869 | #ifdef CONFIG_CIFS_STATS | |
870 | if (total_written > 0) { | |
871 | atomic_inc(&pTcon->num_writes); | |
872 | spin_lock(&pTcon->stat_lock); | |
873 | pTcon->bytes_written += total_written; | |
874 | spin_unlock(&pTcon->stat_lock); | |
875 | } | |
876 | #endif | |
877 | ||
878 | /* since the write may have blocked check these pointers again */ | |
879 | if (file->f_dentry) { | |
880 | if (file->f_dentry->d_inode) { | |
881 | file->f_dentry->d_inode->i_ctime = | |
882 | file->f_dentry->d_inode->i_mtime = CURRENT_TIME; | |
883 | if (total_written > 0) { | |
884 | if (*poffset > file->f_dentry->d_inode->i_size) | |
885 | i_size_write(file->f_dentry->d_inode, | |
886 | *poffset); | |
887 | } | |
888 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
889 | } | |
890 | } | |
891 | FreeXid(xid); | |
892 | return total_written; | |
893 | } | |
894 | ||
895 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) | |
896 | { | |
897 | struct address_space *mapping = page->mapping; | |
898 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
899 | char *write_data; | |
900 | int rc = -EFAULT; | |
901 | int bytes_written = 0; | |
902 | struct cifs_sb_info *cifs_sb; | |
903 | struct cifsTconInfo *pTcon; | |
904 | struct inode *inode; | |
905 | struct cifsInodeInfo *cifsInode; | |
906 | struct cifsFileInfo *open_file = NULL; | |
907 | struct list_head *tmp; | |
908 | struct list_head *tmp1; | |
909 | ||
910 | if (!mapping || !mapping->host) | |
911 | return -EFAULT; | |
912 | ||
913 | inode = page->mapping->host; | |
914 | cifs_sb = CIFS_SB(inode->i_sb); | |
915 | pTcon = cifs_sb->tcon; | |
916 | ||
917 | offset += (loff_t)from; | |
918 | write_data = kmap(page); | |
919 | write_data += from; | |
920 | ||
921 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
922 | kunmap(page); | |
923 | return -EIO; | |
924 | } | |
925 | ||
926 | /* racing with truncate? */ | |
927 | if (offset > mapping->host->i_size) { | |
928 | kunmap(page); | |
929 | return 0; /* don't care */ | |
930 | } | |
931 | ||
932 | /* check to make sure that we are not extending the file */ | |
933 | if (mapping->host->i_size - offset < (loff_t)to) | |
934 | to = (unsigned)(mapping->host->i_size - offset); | |
935 | ||
936 | cifsInode = CIFS_I(mapping->host); | |
937 | read_lock(&GlobalSMBSeslock); | |
938 | /* BB we should start at the end */ | |
939 | list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) { | |
940 | open_file = list_entry(tmp, struct cifsFileInfo, flist); | |
941 | if (open_file->closePend) | |
942 | continue; | |
943 | /* We check if file is open for writing first */ | |
944 | if ((open_file->pfile) && | |
945 | ((open_file->pfile->f_flags & O_RDWR) || | |
946 | (open_file->pfile->f_flags & O_WRONLY))) { | |
947 | read_unlock(&GlobalSMBSeslock); | |
948 | bytes_written = cifs_write(open_file->pfile, | |
949 | write_data, to-from, | |
950 | &offset); | |
951 | read_lock(&GlobalSMBSeslock); | |
952 | /* Does mm or vfs already set times? */ | |
953 | inode->i_atime = | |
954 | inode->i_mtime = current_fs_time(inode->i_sb); | |
955 | if ((bytes_written > 0) && (offset)) { | |
956 | rc = 0; | |
957 | } else if (bytes_written < 0) { | |
958 | if (rc == -EBADF) { | |
959 | /* have seen a case in which kernel seemed to | |
960 | have closed/freed a file even with writes | |
961 | active so we might as well see if there are | |
962 | other file structs to try for the same | |
963 | inode before giving up */ | |
964 | continue; | |
965 | } else | |
966 | rc = bytes_written; | |
967 | } | |
968 | break; /* now that we found a valid file handle and | |
969 | tried to write to it we are done, no sense | |
970 | continuing to loop looking for another */ | |
971 | } | |
972 | if (tmp->next == NULL) { | |
973 | cFYI(1, ("File instance %p removed", tmp)); | |
974 | break; | |
975 | } | |
976 | } | |
977 | read_unlock(&GlobalSMBSeslock); | |
978 | if (open_file == NULL) { | |
979 | cFYI(1, ("No writeable filehandles for inode")); | |
980 | rc = -EIO; | |
981 | } | |
982 | ||
983 | kunmap(page); | |
984 | return rc; | |
985 | } | |
986 | ||
987 | #if 0 | |
988 | static int cifs_writepages(struct address_space *mapping, | |
989 | struct writeback_control *wbc) | |
990 | { | |
991 | int rc = -EFAULT; | |
992 | int xid; | |
993 | ||
994 | xid = GetXid(); | |
995 | ||
996 | /* Find contiguous pages then iterate through repeating | |
997 | call 16K write then Setpageuptodate or if LARGE_WRITE_X | |
998 | support then send larger writes via kevec so as to eliminate | |
999 | a memcpy */ | |
1000 | FreeXid(xid); | |
1001 | return rc; | |
1002 | } | |
1003 | #endif | |
1004 | ||
1005 | static int cifs_writepage(struct page* page, struct writeback_control *wbc) | |
1006 | { | |
1007 | int rc = -EFAULT; | |
1008 | int xid; | |
1009 | ||
1010 | xid = GetXid(); | |
1011 | /* BB add check for wbc flags */ | |
1012 | page_cache_get(page); | |
1013 | if (!PageUptodate(page)) { | |
1014 | cFYI(1, ("ppw - page not up to date")); | |
1015 | } | |
1016 | ||
1017 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); | |
1018 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1019 | unlock_page(page); | |
1020 | page_cache_release(page); | |
1021 | FreeXid(xid); | |
1022 | return rc; | |
1023 | } | |
1024 | ||
1025 | static int cifs_commit_write(struct file *file, struct page *page, | |
1026 | unsigned offset, unsigned to) | |
1027 | { | |
1028 | int xid; | |
1029 | int rc = 0; | |
1030 | struct inode *inode = page->mapping->host; | |
1031 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1032 | char *page_data; | |
1033 | ||
1034 | xid = GetXid(); | |
1035 | cFYI(1, ("commit write for page %p up to position %lld for %d", | |
1036 | page, position, to)); | |
1037 | if (position > inode->i_size) { | |
1038 | i_size_write(inode, position); | |
1039 | /* if (file->private_data == NULL) { | |
1040 | rc = -EBADF; | |
1041 | } else { | |
1042 | open_file = (struct cifsFileInfo *)file->private_data; | |
1043 | cifs_sb = CIFS_SB(inode->i_sb); | |
1044 | rc = -EAGAIN; | |
1045 | while (rc == -EAGAIN) { | |
1046 | if ((open_file->invalidHandle) && | |
1047 | (!open_file->closePend)) { | |
1048 | rc = cifs_reopen_file( | |
1049 | file->f_dentry->d_inode, file); | |
1050 | if (rc != 0) | |
1051 | break; | |
1052 | } | |
1053 | if (!open_file->closePend) { | |
1054 | rc = CIFSSMBSetFileSize(xid, | |
1055 | cifs_sb->tcon, position, | |
1056 | open_file->netfid, | |
1057 | open_file->pid, FALSE); | |
1058 | } else { | |
1059 | rc = -EBADF; | |
1060 | break; | |
1061 | } | |
1062 | } | |
1063 | cFYI(1, (" SetEOF (commit write) rc = %d", rc)); | |
1064 | } */ | |
1065 | } | |
1066 | if (!PageUptodate(page)) { | |
1067 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1068 | /* can not rely on (or let) writepage write this data */ | |
1069 | if (to < offset) { | |
1070 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1071 | offset, to)); | |
1072 | FreeXid(xid); | |
1073 | return rc; | |
1074 | } | |
1075 | /* this is probably better than directly calling | |
1076 | partialpage_write since in this function the file handle is | |
1077 | known which we might as well leverage */ | |
1078 | /* BB check if anything else missing out of ppw | |
1079 | such as updating last write time */ | |
1080 | page_data = kmap(page); | |
1081 | rc = cifs_write(file, page_data + offset, to-offset, | |
1082 | &position); | |
1083 | if (rc > 0) | |
1084 | rc = 0; | |
1085 | /* else if (rc < 0) should we set writebehind rc? */ | |
1086 | kunmap(page); | |
1087 | } else { | |
1088 | set_page_dirty(page); | |
1089 | } | |
1090 | ||
1091 | FreeXid(xid); | |
1092 | return rc; | |
1093 | } | |
1094 | ||
1095 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1096 | { | |
1097 | int xid; | |
1098 | int rc = 0; | |
1099 | struct inode *inode = file->f_dentry->d_inode; | |
1100 | ||
1101 | xid = GetXid(); | |
1102 | ||
1103 | cFYI(1, ("Sync file - name: %s datasync: 0x%x ", | |
1104 | dentry->d_name.name, datasync)); | |
1105 | ||
1106 | rc = filemap_fdatawrite(inode->i_mapping); | |
1107 | if (rc == 0) | |
1108 | CIFS_I(inode)->write_behind_rc = 0; | |
1109 | FreeXid(xid); | |
1110 | return rc; | |
1111 | } | |
1112 | ||
1113 | /* static int cifs_sync_page(struct page *page) | |
1114 | { | |
1115 | struct address_space *mapping; | |
1116 | struct inode *inode; | |
1117 | unsigned long index = page->index; | |
1118 | unsigned int rpages = 0; | |
1119 | int rc = 0; | |
1120 | ||
1121 | cFYI(1, ("sync page %p",page)); | |
1122 | mapping = page->mapping; | |
1123 | if (!mapping) | |
1124 | return 0; | |
1125 | inode = mapping->host; | |
1126 | if (!inode) | |
1127 | return 0; */ | |
1128 | ||
1129 | /* fill in rpages then | |
1130 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ | |
1131 | ||
1132 | /* cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index)); | |
1133 | ||
1134 | if (rc < 0) | |
1135 | return rc; | |
1136 | return 0; | |
1137 | } */ | |
1138 | ||
1139 | /* | |
1140 | * As file closes, flush all cached write data for this inode checking | |
1141 | * for write behind errors. | |
1142 | */ | |
1143 | int cifs_flush(struct file *file) | |
1144 | { | |
1145 | struct inode * inode = file->f_dentry->d_inode; | |
1146 | int rc = 0; | |
1147 | ||
1148 | /* Rather than do the steps manually: | |
1149 | lock the inode for writing | |
1150 | loop through pages looking for write behind data (dirty pages) | |
1151 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1152 | send to server (prefer in parallel) | |
1153 | deal with writebehind errors | |
1154 | unlock inode for writing | |
1155 | filemapfdatawrite appears easier for the time being */ | |
1156 | ||
1157 | rc = filemap_fdatawrite(inode->i_mapping); | |
1158 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1159 | CIFS_I(inode)->write_behind_rc = 0; | |
1160 | ||
1161 | cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc)); | |
1162 | ||
1163 | return rc; | |
1164 | } | |
1165 | ||
1166 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1167 | size_t read_size, loff_t *poffset) | |
1168 | { | |
1169 | int rc = -EACCES; | |
1170 | unsigned int bytes_read = 0; | |
1171 | unsigned int total_read = 0; | |
1172 | unsigned int current_read_size; | |
1173 | struct cifs_sb_info *cifs_sb; | |
1174 | struct cifsTconInfo *pTcon; | |
1175 | int xid; | |
1176 | struct cifsFileInfo *open_file; | |
1177 | char *smb_read_data; | |
1178 | char __user *current_offset; | |
1179 | struct smb_com_read_rsp *pSMBr; | |
1180 | ||
1181 | xid = GetXid(); | |
1182 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1183 | pTcon = cifs_sb->tcon; | |
1184 | ||
1185 | if (file->private_data == NULL) { | |
1186 | FreeXid(xid); | |
1187 | return -EBADF; | |
1188 | } | |
1189 | open_file = (struct cifsFileInfo *)file->private_data; | |
1190 | ||
1191 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1192 | cFYI(1, ("attempting read on write only file instance")); | |
1193 | } | |
1194 | for (total_read = 0, current_offset = read_data; | |
1195 | read_size > total_read; | |
1196 | total_read += bytes_read, current_offset += bytes_read) { | |
1197 | current_read_size = min_t(const int, read_size - total_read, | |
1198 | cifs_sb->rsize); | |
1199 | rc = -EAGAIN; | |
1200 | smb_read_data = NULL; | |
1201 | while (rc == -EAGAIN) { | |
1202 | if ((open_file->invalidHandle) && | |
1203 | (!open_file->closePend)) { | |
1204 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1205 | file, TRUE); | |
1206 | if (rc != 0) | |
1207 | break; | |
1208 | } | |
1209 | ||
1210 | rc = CIFSSMBRead(xid, pTcon, | |
1211 | open_file->netfid, | |
1212 | current_read_size, *poffset, | |
1213 | &bytes_read, &smb_read_data); | |
1214 | ||
1215 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1216 | if (copy_to_user(current_offset, | |
1217 | smb_read_data + 4 /* RFC1001 hdr */ | |
1218 | + le16_to_cpu(pSMBr->DataOffset), | |
1219 | bytes_read)) { | |
1220 | rc = -EFAULT; | |
1221 | FreeXid(xid); | |
1222 | return rc; | |
1223 | } | |
1224 | if (smb_read_data) { | |
1225 | cifs_buf_release(smb_read_data); | |
1226 | smb_read_data = NULL; | |
1227 | } | |
1228 | } | |
1229 | if (rc || (bytes_read == 0)) { | |
1230 | if (total_read) { | |
1231 | break; | |
1232 | } else { | |
1233 | FreeXid(xid); | |
1234 | return rc; | |
1235 | } | |
1236 | } else { | |
1237 | #ifdef CONFIG_CIFS_STATS | |
1238 | atomic_inc(&pTcon->num_reads); | |
1239 | spin_lock(&pTcon->stat_lock); | |
1240 | pTcon->bytes_read += total_read; | |
1241 | spin_unlock(&pTcon->stat_lock); | |
1242 | #endif | |
1243 | *poffset += bytes_read; | |
1244 | } | |
1245 | } | |
1246 | FreeXid(xid); | |
1247 | return total_read; | |
1248 | } | |
1249 | ||
1250 | ||
1251 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1252 | loff_t *poffset) | |
1253 | { | |
1254 | int rc = -EACCES; | |
1255 | unsigned int bytes_read = 0; | |
1256 | unsigned int total_read; | |
1257 | unsigned int current_read_size; | |
1258 | struct cifs_sb_info *cifs_sb; | |
1259 | struct cifsTconInfo *pTcon; | |
1260 | int xid; | |
1261 | char *current_offset; | |
1262 | struct cifsFileInfo *open_file; | |
1263 | ||
1264 | xid = GetXid(); | |
1265 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1266 | pTcon = cifs_sb->tcon; | |
1267 | ||
1268 | if (file->private_data == NULL) { | |
1269 | FreeXid(xid); | |
1270 | return -EBADF; | |
1271 | } | |
1272 | open_file = (struct cifsFileInfo *)file->private_data; | |
1273 | ||
1274 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1275 | cFYI(1, ("attempting read on write only file instance")); | |
1276 | ||
1277 | for (total_read = 0, current_offset = read_data; | |
1278 | read_size > total_read; | |
1279 | total_read += bytes_read, current_offset += bytes_read) { | |
1280 | current_read_size = min_t(const int, read_size - total_read, | |
1281 | cifs_sb->rsize); | |
1282 | rc = -EAGAIN; | |
1283 | while (rc == -EAGAIN) { | |
1284 | if ((open_file->invalidHandle) && | |
1285 | (!open_file->closePend)) { | |
1286 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1287 | file, TRUE); | |
1288 | if (rc != 0) | |
1289 | break; | |
1290 | } | |
1291 | ||
1292 | rc = CIFSSMBRead(xid, pTcon, | |
1293 | open_file->netfid, | |
1294 | current_read_size, *poffset, | |
1295 | &bytes_read, ¤t_offset); | |
1296 | } | |
1297 | if (rc || (bytes_read == 0)) { | |
1298 | if (total_read) { | |
1299 | break; | |
1300 | } else { | |
1301 | FreeXid(xid); | |
1302 | return rc; | |
1303 | } | |
1304 | } else { | |
1305 | #ifdef CONFIG_CIFS_STATS | |
1306 | atomic_inc(&pTcon->num_reads); | |
1307 | spin_lock(&pTcon->stat_lock); | |
1308 | pTcon->bytes_read += total_read; | |
1309 | spin_unlock(&pTcon->stat_lock); | |
1310 | #endif | |
1311 | *poffset += bytes_read; | |
1312 | } | |
1313 | } | |
1314 | FreeXid(xid); | |
1315 | return total_read; | |
1316 | } | |
1317 | ||
1318 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1319 | { | |
1320 | struct dentry *dentry = file->f_dentry; | |
1321 | int rc, xid; | |
1322 | ||
1323 | xid = GetXid(); | |
1324 | rc = cifs_revalidate(dentry); | |
1325 | if (rc) { | |
1326 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1327 | FreeXid(xid); | |
1328 | return rc; | |
1329 | } | |
1330 | rc = generic_file_mmap(file, vma); | |
1331 | FreeXid(xid); | |
1332 | return rc; | |
1333 | } | |
1334 | ||
1335 | ||
1336 | static void cifs_copy_cache_pages(struct address_space *mapping, | |
1337 | struct list_head *pages, int bytes_read, char *data, | |
1338 | struct pagevec *plru_pvec) | |
1339 | { | |
1340 | struct page *page; | |
1341 | char *target; | |
1342 | ||
1343 | while (bytes_read > 0) { | |
1344 | if (list_empty(pages)) | |
1345 | break; | |
1346 | ||
1347 | page = list_entry(pages->prev, struct page, lru); | |
1348 | list_del(&page->lru); | |
1349 | ||
1350 | if (add_to_page_cache(page, mapping, page->index, | |
1351 | GFP_KERNEL)) { | |
1352 | page_cache_release(page); | |
1353 | cFYI(1, ("Add page cache failed")); | |
1354 | continue; | |
1355 | } | |
1356 | ||
1357 | target = kmap_atomic(page,KM_USER0); | |
1358 | ||
1359 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1360 | memcpy(target, data, bytes_read); | |
1361 | /* zero the tail end of this partial page */ | |
1362 | memset(target + bytes_read, 0, | |
1363 | PAGE_CACHE_SIZE - bytes_read); | |
1364 | bytes_read = 0; | |
1365 | } else { | |
1366 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1367 | bytes_read -= PAGE_CACHE_SIZE; | |
1368 | } | |
1369 | kunmap_atomic(target, KM_USER0); | |
1370 | ||
1371 | flush_dcache_page(page); | |
1372 | SetPageUptodate(page); | |
1373 | unlock_page(page); | |
1374 | if (!pagevec_add(plru_pvec, page)) | |
1375 | __pagevec_lru_add(plru_pvec); | |
1376 | data += PAGE_CACHE_SIZE; | |
1377 | } | |
1378 | return; | |
1379 | } | |
1380 | ||
1381 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1382 | struct list_head *page_list, unsigned num_pages) | |
1383 | { | |
1384 | int rc = -EACCES; | |
1385 | int xid; | |
1386 | loff_t offset; | |
1387 | struct page *page; | |
1388 | struct cifs_sb_info *cifs_sb; | |
1389 | struct cifsTconInfo *pTcon; | |
1390 | int bytes_read = 0; | |
1391 | unsigned int read_size,i; | |
1392 | char *smb_read_data = NULL; | |
1393 | struct smb_com_read_rsp *pSMBr; | |
1394 | struct pagevec lru_pvec; | |
1395 | struct cifsFileInfo *open_file; | |
1396 | ||
1397 | xid = GetXid(); | |
1398 | if (file->private_data == NULL) { | |
1399 | FreeXid(xid); | |
1400 | return -EBADF; | |
1401 | } | |
1402 | open_file = (struct cifsFileInfo *)file->private_data; | |
1403 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1404 | pTcon = cifs_sb->tcon; | |
1405 | ||
1406 | pagevec_init(&lru_pvec, 0); | |
1407 | ||
1408 | for (i = 0; i < num_pages; ) { | |
1409 | unsigned contig_pages; | |
1410 | struct page *tmp_page; | |
1411 | unsigned long expected_index; | |
1412 | ||
1413 | if (list_empty(page_list)) | |
1414 | break; | |
1415 | ||
1416 | page = list_entry(page_list->prev, struct page, lru); | |
1417 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1418 | ||
1419 | /* count adjacent pages that we will read into */ | |
1420 | contig_pages = 0; | |
1421 | expected_index = | |
1422 | list_entry(page_list->prev, struct page, lru)->index; | |
1423 | list_for_each_entry_reverse(tmp_page,page_list,lru) { | |
1424 | if (tmp_page->index == expected_index) { | |
1425 | contig_pages++; | |
1426 | expected_index++; | |
1427 | } else | |
1428 | break; | |
1429 | } | |
1430 | if (contig_pages + i > num_pages) | |
1431 | contig_pages = num_pages - i; | |
1432 | ||
1433 | /* for reads over a certain size could initiate async | |
1434 | read ahead */ | |
1435 | ||
1436 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1437 | /* Read size needs to be in multiples of one page */ | |
1438 | read_size = min_t(const unsigned int, read_size, | |
1439 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
1440 | ||
1441 | rc = -EAGAIN; | |
1442 | while (rc == -EAGAIN) { | |
1443 | if ((open_file->invalidHandle) && | |
1444 | (!open_file->closePend)) { | |
1445 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1446 | file, TRUE); | |
1447 | if (rc != 0) | |
1448 | break; | |
1449 | } | |
1450 | ||
1451 | rc = CIFSSMBRead(xid, pTcon, | |
1452 | open_file->netfid, | |
1453 | read_size, offset, | |
1454 | &bytes_read, &smb_read_data); | |
1455 | /* BB need to check return code here */ | |
1456 | if (rc== -EAGAIN) { | |
1457 | if (smb_read_data) { | |
1458 | cifs_buf_release(smb_read_data); | |
1459 | smb_read_data = NULL; | |
1460 | } | |
1461 | } | |
1462 | } | |
1463 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1464 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1465 | /* clean up remaing pages off list */ | |
1466 | while (!list_empty(page_list) && (i < num_pages)) { | |
1467 | page = list_entry(page_list->prev, struct page, | |
1468 | lru); | |
1469 | list_del(&page->lru); | |
1470 | page_cache_release(page); | |
1471 | } | |
1472 | break; | |
1473 | } else if (bytes_read > 0) { | |
1474 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1475 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1476 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1477 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1478 | ||
1479 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
1480 | #ifdef CONFIG_CIFS_STATS | |
1481 | atomic_inc(&pTcon->num_reads); | |
1482 | spin_lock(&pTcon->stat_lock); | |
1483 | pTcon->bytes_read += bytes_read; | |
1484 | spin_unlock(&pTcon->stat_lock); | |
1485 | #endif | |
1486 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { | |
1487 | i++; /* account for partial page */ | |
1488 | ||
1489 | /* server copy of file can have smaller size | |
1490 | than client */ | |
1491 | /* BB do we need to verify this common case ? | |
1492 | this case is ok - if we are at server EOF | |
1493 | we will hit it on next read */ | |
1494 | ||
1495 | /* while (!list_empty(page_list) && (i < num_pages)) { | |
1496 | page = list_entry(page_list->prev, | |
1497 | struct page, list); | |
1498 | list_del(&page->list); | |
1499 | page_cache_release(page); | |
1500 | } | |
1501 | break; */ | |
1502 | } | |
1503 | } else { | |
1504 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1505 | "Cleaning remaining pages from readahead list", | |
1506 | bytes_read, offset)); | |
1507 | /* BB turn off caching and do new lookup on | |
1508 | file size at server? */ | |
1509 | while (!list_empty(page_list) && (i < num_pages)) { | |
1510 | page = list_entry(page_list->prev, struct page, | |
1511 | lru); | |
1512 | list_del(&page->lru); | |
1513 | ||
1514 | /* BB removeme - replace with zero of page? */ | |
1515 | page_cache_release(page); | |
1516 | } | |
1517 | break; | |
1518 | } | |
1519 | if (smb_read_data) { | |
1520 | cifs_buf_release(smb_read_data); | |
1521 | smb_read_data = NULL; | |
1522 | } | |
1523 | bytes_read = 0; | |
1524 | } | |
1525 | ||
1526 | pagevec_lru_add(&lru_pvec); | |
1527 | ||
1528 | /* need to free smb_read_data buf before exit */ | |
1529 | if (smb_read_data) { | |
1530 | cifs_buf_release(smb_read_data); | |
1531 | smb_read_data = NULL; | |
1532 | } | |
1533 | ||
1534 | FreeXid(xid); | |
1535 | return rc; | |
1536 | } | |
1537 | ||
1538 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1539 | loff_t *poffset) | |
1540 | { | |
1541 | char *read_data; | |
1542 | int rc; | |
1543 | ||
1544 | page_cache_get(page); | |
1545 | read_data = kmap(page); | |
1546 | /* for reads over a certain size could initiate async read ahead */ | |
1547 | ||
1548 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); | |
1549 | ||
1550 | if (rc < 0) | |
1551 | goto io_error; | |
1552 | else | |
1553 | cFYI(1, ("Bytes read %d ",rc)); | |
1554 | ||
1555 | file->f_dentry->d_inode->i_atime = | |
1556 | current_fs_time(file->f_dentry->d_inode->i_sb); | |
1557 | ||
1558 | if (PAGE_CACHE_SIZE > rc) | |
1559 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1560 | ||
1561 | flush_dcache_page(page); | |
1562 | SetPageUptodate(page); | |
1563 | rc = 0; | |
1564 | ||
1565 | io_error: | |
1566 | kunmap(page); | |
1567 | page_cache_release(page); | |
1568 | return rc; | |
1569 | } | |
1570 | ||
1571 | static int cifs_readpage(struct file *file, struct page *page) | |
1572 | { | |
1573 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1574 | int rc = -EACCES; | |
1575 | int xid; | |
1576 | ||
1577 | xid = GetXid(); | |
1578 | ||
1579 | if (file->private_data == NULL) { | |
1580 | FreeXid(xid); | |
1581 | return -EBADF; | |
1582 | } | |
1583 | ||
1584 | cFYI(1, ("readpage %p at offset %d 0x%x\n", | |
1585 | page, (int)offset, (int)offset)); | |
1586 | ||
1587 | rc = cifs_readpage_worker(file, page, &offset); | |
1588 | ||
1589 | unlock_page(page); | |
1590 | ||
1591 | FreeXid(xid); | |
1592 | return rc; | |
1593 | } | |
1594 | ||
1595 | /* We do not want to update the file size from server for inodes | |
1596 | open for write - to avoid races with writepage extending | |
1597 | the file - in the future we could consider allowing | |
1598 | refreshing the inode only on increases in the file size | |
1599 | but this is tricky to do without racing with writebehind | |
1600 | page caching in the current Linux kernel design */ | |
1601 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode) | |
1602 | { | |
1603 | struct list_head *tmp; | |
1604 | struct list_head *tmp1; | |
1605 | struct cifsFileInfo *open_file = NULL; | |
1606 | int rc = TRUE; | |
1607 | ||
1608 | if (cifsInode == NULL) | |
1609 | return rc; | |
1610 | ||
1611 | read_lock(&GlobalSMBSeslock); | |
1612 | list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) { | |
1613 | open_file = list_entry(tmp, struct cifsFileInfo, flist); | |
1614 | if (open_file == NULL) | |
1615 | break; | |
1616 | if (open_file->closePend) | |
1617 | continue; | |
1618 | /* We check if file is open for writing, | |
1619 | BB we could supplement this with a check to see if file size | |
1620 | changes have been flushed to server - ie inode metadata dirty */ | |
1621 | if ((open_file->pfile) && | |
1622 | ((open_file->pfile->f_flags & O_RDWR) || | |
1623 | (open_file->pfile->f_flags & O_WRONLY))) { | |
1624 | rc = FALSE; | |
1625 | break; | |
1626 | } | |
1627 | if (tmp->next == NULL) { | |
1628 | cFYI(1, ("File instance %p removed", tmp)); | |
1629 | break; | |
1630 | } | |
1631 | } | |
1632 | read_unlock(&GlobalSMBSeslock); | |
1633 | return rc; | |
1634 | } | |
1635 | ||
1636 | ||
1637 | static int cifs_prepare_write(struct file *file, struct page *page, | |
1638 | unsigned from, unsigned to) | |
1639 | { | |
1640 | int rc = 0; | |
1641 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1642 | cFYI(1, ("prepare write for page %p from %d to %d",page,from,to)); | |
1643 | if (!PageUptodate(page)) { | |
1644 | /* if (to - from != PAGE_CACHE_SIZE) { | |
1645 | void *kaddr = kmap_atomic(page, KM_USER0); | |
1646 | memset(kaddr, 0, from); | |
1647 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); | |
1648 | flush_dcache_page(page); | |
1649 | kunmap_atomic(kaddr, KM_USER0); | |
1650 | } */ | |
1651 | /* If we are writing a full page it will be up to date, | |
1652 | no need to read from the server */ | |
1653 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) | |
1654 | SetPageUptodate(page); | |
1655 | ||
1656 | /* might as well read a page, it is fast enough */ | |
1657 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1658 | rc = cifs_readpage_worker(file, page, &offset); | |
1659 | } else { | |
1660 | /* should we try using another file handle if there is one - | |
1661 | how would we lock it to prevent close of that handle | |
1662 | racing with this read? | |
1663 | In any case this will be written out by commit_write */ | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | /* BB should we pass any errors back? | |
1668 | e.g. if we do not have read access to the file */ | |
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | struct address_space_operations cifs_addr_ops = { | |
1673 | .readpage = cifs_readpage, | |
1674 | .readpages = cifs_readpages, | |
1675 | .writepage = cifs_writepage, | |
1676 | .prepare_write = cifs_prepare_write, | |
1677 | .commit_write = cifs_commit_write, | |
1678 | .set_page_dirty = __set_page_dirty_nobuffers, | |
1679 | /* .sync_page = cifs_sync_page, */ | |
1680 | /* .direct_IO = */ | |
1681 | }; |