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")); | |
31ca3bc3 SF |
515 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
516 | (pCFileStruct->invalidHandle == FALSE)) { | |
1da177e4 LT |
517 | pCFileStruct->invalidHandle = TRUE; |
518 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
519 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
520 | rc)); | |
521 | /* not much we can do if it fails anyway, ignore rc */ | |
522 | rc = 0; | |
523 | } | |
524 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
525 | if (ptmp) { | |
526 | /* BB removeme BB */ cFYI(1, ("freeing smb buf in srch struct in closedir")); | |
527 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; | |
528 | cifs_buf_release(ptmp); | |
529 | } | |
530 | ptmp = pCFileStruct->search_resume_name; | |
531 | if (ptmp) { | |
532 | /* BB removeme BB */ cFYI(1, ("freeing resume name in closedir")); | |
533 | pCFileStruct->search_resume_name = NULL; | |
534 | kfree(ptmp); | |
535 | } | |
536 | kfree(file->private_data); | |
537 | file->private_data = NULL; | |
538 | } | |
539 | /* BB can we lock the filestruct while this is going on? */ | |
540 | FreeXid(xid); | |
541 | return rc; | |
542 | } | |
543 | ||
544 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) | |
545 | { | |
546 | int rc, xid; | |
547 | __u32 lockType = LOCKING_ANDX_LARGE_FILES; | |
548 | __u32 numLock = 0; | |
549 | __u32 numUnlock = 0; | |
550 | __u64 length; | |
551 | int wait_flag = FALSE; | |
552 | struct cifs_sb_info *cifs_sb; | |
553 | struct cifsTconInfo *pTcon; | |
554 | ||
555 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
556 | rc = -EACCES; | |
557 | xid = GetXid(); | |
558 | ||
559 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
560 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
561 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, | |
562 | pfLock->fl_end)); | |
563 | ||
564 | if (pfLock->fl_flags & FL_POSIX) | |
565 | cFYI(1, ("Posix ")); | |
566 | if (pfLock->fl_flags & FL_FLOCK) | |
567 | cFYI(1, ("Flock ")); | |
568 | if (pfLock->fl_flags & FL_SLEEP) { | |
569 | cFYI(1, ("Blocking lock ")); | |
570 | wait_flag = TRUE; | |
571 | } | |
572 | if (pfLock->fl_flags & FL_ACCESS) | |
573 | cFYI(1, ("Process suspended by mandatory locking - " | |
574 | "not implemented yet ")); | |
575 | if (pfLock->fl_flags & FL_LEASE) | |
576 | cFYI(1, ("Lease on file - not implemented yet")); | |
577 | if (pfLock->fl_flags & | |
578 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) | |
579 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
580 | ||
581 | if (pfLock->fl_type == F_WRLCK) { | |
582 | cFYI(1, ("F_WRLCK ")); | |
583 | numLock = 1; | |
584 | } else if (pfLock->fl_type == F_UNLCK) { | |
585 | cFYI(1, ("F_UNLCK ")); | |
586 | numUnlock = 1; | |
587 | } else if (pfLock->fl_type == F_RDLCK) { | |
588 | cFYI(1, ("F_RDLCK ")); | |
589 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
590 | numLock = 1; | |
591 | } else if (pfLock->fl_type == F_EXLCK) { | |
592 | cFYI(1, ("F_EXLCK ")); | |
593 | numLock = 1; | |
594 | } else if (pfLock->fl_type == F_SHLCK) { | |
595 | cFYI(1, ("F_SHLCK ")); | |
596 | lockType |= LOCKING_ANDX_SHARED_LOCK; | |
597 | numLock = 1; | |
598 | } else | |
599 | cFYI(1, ("Unknown type of lock ")); | |
600 | ||
601 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
602 | pTcon = cifs_sb->tcon; | |
603 | ||
604 | if (file->private_data == NULL) { | |
605 | FreeXid(xid); | |
606 | return -EBADF; | |
607 | } | |
608 | ||
609 | if (IS_GETLK(cmd)) { | |
610 | rc = CIFSSMBLock(xid, pTcon, | |
611 | ((struct cifsFileInfo *)file-> | |
612 | private_data)->netfid, | |
613 | length, | |
614 | pfLock->fl_start, 0, 1, lockType, | |
615 | 0 /* wait flag */ ); | |
616 | if (rc == 0) { | |
617 | rc = CIFSSMBLock(xid, pTcon, | |
618 | ((struct cifsFileInfo *) file-> | |
619 | private_data)->netfid, | |
620 | length, | |
621 | pfLock->fl_start, 1 /* numUnlock */ , | |
622 | 0 /* numLock */ , lockType, | |
623 | 0 /* wait flag */ ); | |
624 | pfLock->fl_type = F_UNLCK; | |
625 | if (rc != 0) | |
626 | cERROR(1, ("Error unlocking previously locked " | |
627 | "range %d during test of lock ", | |
628 | rc)); | |
629 | rc = 0; | |
630 | ||
631 | } else { | |
632 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
633 | rc = 0; /* do not change lock type to unlock | |
634 | since range in use */ | |
635 | } | |
636 | ||
637 | FreeXid(xid); | |
638 | return rc; | |
639 | } | |
640 | ||
641 | rc = CIFSSMBLock(xid, pTcon, | |
642 | ((struct cifsFileInfo *) file->private_data)-> | |
643 | netfid, length, | |
644 | pfLock->fl_start, numUnlock, numLock, lockType, | |
645 | wait_flag); | |
d634cc15 | 646 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
647 | posix_lock_file_wait(file, pfLock); |
648 | FreeXid(xid); | |
649 | return rc; | |
650 | } | |
651 | ||
652 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
653 | size_t write_size, loff_t *poffset) | |
654 | { | |
655 | int rc = 0; | |
656 | unsigned int bytes_written = 0; | |
657 | unsigned int total_written; | |
658 | struct cifs_sb_info *cifs_sb; | |
659 | struct cifsTconInfo *pTcon; | |
660 | int xid, long_op; | |
661 | struct cifsFileInfo *open_file; | |
662 | ||
663 | if (file->f_dentry == NULL) | |
664 | return -EBADF; | |
665 | ||
666 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
667 | if (cifs_sb == NULL) | |
668 | return -EBADF; | |
669 | ||
670 | pTcon = cifs_sb->tcon; | |
671 | ||
672 | /* cFYI(1, | |
673 | (" write %d bytes to offset %lld of %s", write_size, | |
674 | *poffset, file->f_dentry->d_name.name)); */ | |
675 | ||
676 | if (file->private_data == NULL) | |
677 | return -EBADF; | |
678 | else | |
679 | open_file = (struct cifsFileInfo *) file->private_data; | |
680 | ||
681 | xid = GetXid(); | |
682 | if (file->f_dentry->d_inode == NULL) { | |
683 | FreeXid(xid); | |
684 | return -EBADF; | |
685 | } | |
686 | ||
687 | if (*poffset > file->f_dentry->d_inode->i_size) | |
688 | long_op = 2; /* writes past end of file can take a long time */ | |
689 | else | |
690 | long_op = 1; | |
691 | ||
692 | for (total_written = 0; write_size > total_written; | |
693 | total_written += bytes_written) { | |
694 | rc = -EAGAIN; | |
695 | while (rc == -EAGAIN) { | |
696 | if (file->private_data == NULL) { | |
697 | /* file has been closed on us */ | |
698 | FreeXid(xid); | |
699 | /* if we have gotten here we have written some data | |
700 | and blocked, and the file has been freed on us while | |
701 | we blocked so return what we managed to write */ | |
702 | return total_written; | |
703 | } | |
704 | if (open_file->closePend) { | |
705 | FreeXid(xid); | |
706 | if (total_written) | |
707 | return total_written; | |
708 | else | |
709 | return -EBADF; | |
710 | } | |
711 | if (open_file->invalidHandle) { | |
712 | if ((file->f_dentry == NULL) || | |
713 | (file->f_dentry->d_inode == NULL)) { | |
714 | FreeXid(xid); | |
715 | return total_written; | |
716 | } | |
717 | /* we could deadlock if we called | |
718 | filemap_fdatawait from here so tell | |
719 | reopen_file not to flush data to server | |
720 | now */ | |
721 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
722 | file, FALSE); | |
723 | if (rc != 0) | |
724 | break; | |
725 | } | |
726 | ||
727 | rc = CIFSSMBWrite(xid, pTcon, | |
728 | open_file->netfid, | |
729 | min_t(const int, cifs_sb->wsize, | |
730 | write_size - total_written), | |
731 | *poffset, &bytes_written, | |
732 | NULL, write_data + total_written, long_op); | |
733 | } | |
734 | if (rc || (bytes_written == 0)) { | |
735 | if (total_written) | |
736 | break; | |
737 | else { | |
738 | FreeXid(xid); | |
739 | return rc; | |
740 | } | |
741 | } else | |
742 | *poffset += bytes_written; | |
743 | long_op = FALSE; /* subsequent writes fast - | |
744 | 15 seconds is plenty */ | |
745 | } | |
746 | ||
747 | #ifdef CONFIG_CIFS_STATS | |
748 | if (total_written > 0) { | |
749 | atomic_inc(&pTcon->num_writes); | |
750 | spin_lock(&pTcon->stat_lock); | |
751 | pTcon->bytes_written += total_written; | |
752 | spin_unlock(&pTcon->stat_lock); | |
753 | } | |
754 | #endif | |
755 | ||
756 | /* since the write may have blocked check these pointers again */ | |
757 | if (file->f_dentry) { | |
758 | if (file->f_dentry->d_inode) { | |
759 | struct inode *inode = file->f_dentry->d_inode; | |
760 | inode->i_ctime = inode->i_mtime = | |
761 | current_fs_time(inode->i_sb); | |
762 | if (total_written > 0) { | |
763 | if (*poffset > file->f_dentry->d_inode->i_size) | |
764 | i_size_write(file->f_dentry->d_inode, | |
765 | *poffset); | |
766 | } | |
767 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
768 | } | |
769 | } | |
770 | FreeXid(xid); | |
771 | return total_written; | |
772 | } | |
773 | ||
774 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
775 | size_t write_size, loff_t *poffset) | |
776 | { | |
777 | int rc = 0; | |
778 | unsigned int bytes_written = 0; | |
779 | unsigned int total_written; | |
780 | struct cifs_sb_info *cifs_sb; | |
781 | struct cifsTconInfo *pTcon; | |
782 | int xid, long_op; | |
783 | struct cifsFileInfo *open_file; | |
784 | ||
785 | if (file->f_dentry == NULL) | |
786 | return -EBADF; | |
787 | ||
788 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
789 | if (cifs_sb == NULL) | |
790 | return -EBADF; | |
791 | ||
792 | pTcon = cifs_sb->tcon; | |
793 | ||
794 | /* cFYI(1, | |
795 | (" write %d bytes to offset %lld of %s", write_size, | |
796 | *poffset, file->f_dentry->d_name.name)); */ | |
797 | ||
798 | if (file->private_data == NULL) | |
799 | return -EBADF; | |
800 | else | |
801 | open_file = (struct cifsFileInfo *)file->private_data; | |
802 | ||
803 | xid = GetXid(); | |
804 | if (file->f_dentry->d_inode == NULL) { | |
805 | FreeXid(xid); | |
806 | return -EBADF; | |
807 | } | |
808 | ||
809 | if (*poffset > file->f_dentry->d_inode->i_size) | |
810 | long_op = 2; /* writes past end of file can take a long time */ | |
811 | else | |
812 | long_op = 1; | |
813 | ||
814 | for (total_written = 0; write_size > total_written; | |
815 | total_written += bytes_written) { | |
816 | rc = -EAGAIN; | |
817 | while (rc == -EAGAIN) { | |
818 | if (file->private_data == NULL) { | |
819 | /* file has been closed on us */ | |
820 | FreeXid(xid); | |
821 | /* if we have gotten here we have written some data | |
822 | and blocked, and the file has been freed on us | |
823 | while we blocked so return what we managed to | |
824 | write */ | |
825 | return total_written; | |
826 | } | |
827 | if (open_file->closePend) { | |
828 | FreeXid(xid); | |
829 | if (total_written) | |
830 | return total_written; | |
831 | else | |
832 | return -EBADF; | |
833 | } | |
834 | if (open_file->invalidHandle) { | |
835 | if ((file->f_dentry == NULL) || | |
836 | (file->f_dentry->d_inode == NULL)) { | |
837 | FreeXid(xid); | |
838 | return total_written; | |
839 | } | |
840 | /* we could deadlock if we called | |
841 | filemap_fdatawait from here so tell | |
842 | reopen_file not to flush data to | |
843 | server now */ | |
844 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
845 | file, FALSE); | |
846 | if (rc != 0) | |
847 | break; | |
848 | } | |
849 | ||
850 | rc = CIFSSMBWrite(xid, pTcon, | |
851 | open_file->netfid, | |
852 | min_t(const int, cifs_sb->wsize, | |
853 | write_size - total_written), | |
854 | *poffset, &bytes_written, | |
855 | write_data + total_written, NULL, long_op); | |
856 | } | |
857 | if (rc || (bytes_written == 0)) { | |
858 | if (total_written) | |
859 | break; | |
860 | else { | |
861 | FreeXid(xid); | |
862 | return rc; | |
863 | } | |
864 | } else | |
865 | *poffset += bytes_written; | |
866 | long_op = FALSE; /* subsequent writes fast - | |
867 | 15 seconds is plenty */ | |
868 | } | |
869 | ||
870 | #ifdef CONFIG_CIFS_STATS | |
871 | if (total_written > 0) { | |
872 | atomic_inc(&pTcon->num_writes); | |
873 | spin_lock(&pTcon->stat_lock); | |
874 | pTcon->bytes_written += total_written; | |
875 | spin_unlock(&pTcon->stat_lock); | |
876 | } | |
877 | #endif | |
878 | ||
879 | /* since the write may have blocked check these pointers again */ | |
880 | if (file->f_dentry) { | |
881 | if (file->f_dentry->d_inode) { | |
882 | file->f_dentry->d_inode->i_ctime = | |
883 | file->f_dentry->d_inode->i_mtime = CURRENT_TIME; | |
884 | if (total_written > 0) { | |
885 | if (*poffset > file->f_dentry->d_inode->i_size) | |
886 | i_size_write(file->f_dentry->d_inode, | |
887 | *poffset); | |
888 | } | |
889 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
890 | } | |
891 | } | |
892 | FreeXid(xid); | |
893 | return total_written; | |
894 | } | |
895 | ||
896 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) | |
897 | { | |
898 | struct address_space *mapping = page->mapping; | |
899 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
900 | char *write_data; | |
901 | int rc = -EFAULT; | |
902 | int bytes_written = 0; | |
903 | struct cifs_sb_info *cifs_sb; | |
904 | struct cifsTconInfo *pTcon; | |
905 | struct inode *inode; | |
906 | struct cifsInodeInfo *cifsInode; | |
907 | struct cifsFileInfo *open_file = NULL; | |
908 | struct list_head *tmp; | |
909 | struct list_head *tmp1; | |
910 | ||
911 | if (!mapping || !mapping->host) | |
912 | return -EFAULT; | |
913 | ||
914 | inode = page->mapping->host; | |
915 | cifs_sb = CIFS_SB(inode->i_sb); | |
916 | pTcon = cifs_sb->tcon; | |
917 | ||
918 | offset += (loff_t)from; | |
919 | write_data = kmap(page); | |
920 | write_data += from; | |
921 | ||
922 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
923 | kunmap(page); | |
924 | return -EIO; | |
925 | } | |
926 | ||
927 | /* racing with truncate? */ | |
928 | if (offset > mapping->host->i_size) { | |
929 | kunmap(page); | |
930 | return 0; /* don't care */ | |
931 | } | |
932 | ||
933 | /* check to make sure that we are not extending the file */ | |
934 | if (mapping->host->i_size - offset < (loff_t)to) | |
935 | to = (unsigned)(mapping->host->i_size - offset); | |
936 | ||
937 | cifsInode = CIFS_I(mapping->host); | |
938 | read_lock(&GlobalSMBSeslock); | |
939 | /* BB we should start at the end */ | |
940 | list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) { | |
941 | open_file = list_entry(tmp, struct cifsFileInfo, flist); | |
942 | if (open_file->closePend) | |
943 | continue; | |
944 | /* We check if file is open for writing first */ | |
945 | if ((open_file->pfile) && | |
946 | ((open_file->pfile->f_flags & O_RDWR) || | |
947 | (open_file->pfile->f_flags & O_WRONLY))) { | |
948 | read_unlock(&GlobalSMBSeslock); | |
949 | bytes_written = cifs_write(open_file->pfile, | |
950 | write_data, to-from, | |
951 | &offset); | |
952 | read_lock(&GlobalSMBSeslock); | |
953 | /* Does mm or vfs already set times? */ | |
954 | inode->i_atime = | |
955 | inode->i_mtime = current_fs_time(inode->i_sb); | |
956 | if ((bytes_written > 0) && (offset)) { | |
957 | rc = 0; | |
958 | } else if (bytes_written < 0) { | |
959 | if (rc == -EBADF) { | |
960 | /* have seen a case in which kernel seemed to | |
961 | have closed/freed a file even with writes | |
962 | active so we might as well see if there are | |
963 | other file structs to try for the same | |
964 | inode before giving up */ | |
965 | continue; | |
966 | } else | |
967 | rc = bytes_written; | |
968 | } | |
969 | break; /* now that we found a valid file handle and | |
970 | tried to write to it we are done, no sense | |
971 | continuing to loop looking for another */ | |
972 | } | |
973 | if (tmp->next == NULL) { | |
974 | cFYI(1, ("File instance %p removed", tmp)); | |
975 | break; | |
976 | } | |
977 | } | |
978 | read_unlock(&GlobalSMBSeslock); | |
979 | if (open_file == NULL) { | |
980 | cFYI(1, ("No writeable filehandles for inode")); | |
981 | rc = -EIO; | |
982 | } | |
983 | ||
984 | kunmap(page); | |
985 | return rc; | |
986 | } | |
987 | ||
988 | #if 0 | |
989 | static int cifs_writepages(struct address_space *mapping, | |
990 | struct writeback_control *wbc) | |
991 | { | |
992 | int rc = -EFAULT; | |
993 | int xid; | |
994 | ||
995 | xid = GetXid(); | |
996 | ||
997 | /* Find contiguous pages then iterate through repeating | |
998 | call 16K write then Setpageuptodate or if LARGE_WRITE_X | |
999 | support then send larger writes via kevec so as to eliminate | |
1000 | a memcpy */ | |
1001 | FreeXid(xid); | |
1002 | return rc; | |
1003 | } | |
1004 | #endif | |
1005 | ||
1006 | static int cifs_writepage(struct page* page, struct writeback_control *wbc) | |
1007 | { | |
1008 | int rc = -EFAULT; | |
1009 | int xid; | |
1010 | ||
1011 | xid = GetXid(); | |
1012 | /* BB add check for wbc flags */ | |
1013 | page_cache_get(page); | |
1014 | if (!PageUptodate(page)) { | |
1015 | cFYI(1, ("ppw - page not up to date")); | |
1016 | } | |
1017 | ||
1018 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); | |
1019 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1020 | unlock_page(page); | |
1021 | page_cache_release(page); | |
1022 | FreeXid(xid); | |
1023 | return rc; | |
1024 | } | |
1025 | ||
1026 | static int cifs_commit_write(struct file *file, struct page *page, | |
1027 | unsigned offset, unsigned to) | |
1028 | { | |
1029 | int xid; | |
1030 | int rc = 0; | |
1031 | struct inode *inode = page->mapping->host; | |
1032 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1033 | char *page_data; | |
1034 | ||
1035 | xid = GetXid(); | |
1036 | cFYI(1, ("commit write for page %p up to position %lld for %d", | |
1037 | page, position, to)); | |
1038 | if (position > inode->i_size) { | |
1039 | i_size_write(inode, position); | |
1040 | /* if (file->private_data == NULL) { | |
1041 | rc = -EBADF; | |
1042 | } else { | |
1043 | open_file = (struct cifsFileInfo *)file->private_data; | |
1044 | cifs_sb = CIFS_SB(inode->i_sb); | |
1045 | rc = -EAGAIN; | |
1046 | while (rc == -EAGAIN) { | |
1047 | if ((open_file->invalidHandle) && | |
1048 | (!open_file->closePend)) { | |
1049 | rc = cifs_reopen_file( | |
1050 | file->f_dentry->d_inode, file); | |
1051 | if (rc != 0) | |
1052 | break; | |
1053 | } | |
1054 | if (!open_file->closePend) { | |
1055 | rc = CIFSSMBSetFileSize(xid, | |
1056 | cifs_sb->tcon, position, | |
1057 | open_file->netfid, | |
1058 | open_file->pid, FALSE); | |
1059 | } else { | |
1060 | rc = -EBADF; | |
1061 | break; | |
1062 | } | |
1063 | } | |
1064 | cFYI(1, (" SetEOF (commit write) rc = %d", rc)); | |
1065 | } */ | |
1066 | } | |
1067 | if (!PageUptodate(page)) { | |
1068 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1069 | /* can not rely on (or let) writepage write this data */ | |
1070 | if (to < offset) { | |
1071 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1072 | offset, to)); | |
1073 | FreeXid(xid); | |
1074 | return rc; | |
1075 | } | |
1076 | /* this is probably better than directly calling | |
1077 | partialpage_write since in this function the file handle is | |
1078 | known which we might as well leverage */ | |
1079 | /* BB check if anything else missing out of ppw | |
1080 | such as updating last write time */ | |
1081 | page_data = kmap(page); | |
1082 | rc = cifs_write(file, page_data + offset, to-offset, | |
1083 | &position); | |
1084 | if (rc > 0) | |
1085 | rc = 0; | |
1086 | /* else if (rc < 0) should we set writebehind rc? */ | |
1087 | kunmap(page); | |
1088 | } else { | |
1089 | set_page_dirty(page); | |
1090 | } | |
1091 | ||
1092 | FreeXid(xid); | |
1093 | return rc; | |
1094 | } | |
1095 | ||
1096 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1097 | { | |
1098 | int xid; | |
1099 | int rc = 0; | |
1100 | struct inode *inode = file->f_dentry->d_inode; | |
1101 | ||
1102 | xid = GetXid(); | |
1103 | ||
1104 | cFYI(1, ("Sync file - name: %s datasync: 0x%x ", | |
1105 | dentry->d_name.name, datasync)); | |
1106 | ||
1107 | rc = filemap_fdatawrite(inode->i_mapping); | |
1108 | if (rc == 0) | |
1109 | CIFS_I(inode)->write_behind_rc = 0; | |
1110 | FreeXid(xid); | |
1111 | return rc; | |
1112 | } | |
1113 | ||
1114 | /* static int cifs_sync_page(struct page *page) | |
1115 | { | |
1116 | struct address_space *mapping; | |
1117 | struct inode *inode; | |
1118 | unsigned long index = page->index; | |
1119 | unsigned int rpages = 0; | |
1120 | int rc = 0; | |
1121 | ||
1122 | cFYI(1, ("sync page %p",page)); | |
1123 | mapping = page->mapping; | |
1124 | if (!mapping) | |
1125 | return 0; | |
1126 | inode = mapping->host; | |
1127 | if (!inode) | |
1128 | return 0; */ | |
1129 | ||
1130 | /* fill in rpages then | |
1131 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ | |
1132 | ||
1133 | /* cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index)); | |
1134 | ||
1135 | if (rc < 0) | |
1136 | return rc; | |
1137 | return 0; | |
1138 | } */ | |
1139 | ||
1140 | /* | |
1141 | * As file closes, flush all cached write data for this inode checking | |
1142 | * for write behind errors. | |
1143 | */ | |
1144 | int cifs_flush(struct file *file) | |
1145 | { | |
1146 | struct inode * inode = file->f_dentry->d_inode; | |
1147 | int rc = 0; | |
1148 | ||
1149 | /* Rather than do the steps manually: | |
1150 | lock the inode for writing | |
1151 | loop through pages looking for write behind data (dirty pages) | |
1152 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1153 | send to server (prefer in parallel) | |
1154 | deal with writebehind errors | |
1155 | unlock inode for writing | |
1156 | filemapfdatawrite appears easier for the time being */ | |
1157 | ||
1158 | rc = filemap_fdatawrite(inode->i_mapping); | |
1159 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1160 | CIFS_I(inode)->write_behind_rc = 0; | |
1161 | ||
1162 | cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc)); | |
1163 | ||
1164 | return rc; | |
1165 | } | |
1166 | ||
1167 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1168 | size_t read_size, loff_t *poffset) | |
1169 | { | |
1170 | int rc = -EACCES; | |
1171 | unsigned int bytes_read = 0; | |
1172 | unsigned int total_read = 0; | |
1173 | unsigned int current_read_size; | |
1174 | struct cifs_sb_info *cifs_sb; | |
1175 | struct cifsTconInfo *pTcon; | |
1176 | int xid; | |
1177 | struct cifsFileInfo *open_file; | |
1178 | char *smb_read_data; | |
1179 | char __user *current_offset; | |
1180 | struct smb_com_read_rsp *pSMBr; | |
1181 | ||
1182 | xid = GetXid(); | |
1183 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1184 | pTcon = cifs_sb->tcon; | |
1185 | ||
1186 | if (file->private_data == NULL) { | |
1187 | FreeXid(xid); | |
1188 | return -EBADF; | |
1189 | } | |
1190 | open_file = (struct cifsFileInfo *)file->private_data; | |
1191 | ||
1192 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1193 | cFYI(1, ("attempting read on write only file instance")); | |
1194 | } | |
1195 | for (total_read = 0, current_offset = read_data; | |
1196 | read_size > total_read; | |
1197 | total_read += bytes_read, current_offset += bytes_read) { | |
1198 | current_read_size = min_t(const int, read_size - total_read, | |
1199 | cifs_sb->rsize); | |
1200 | rc = -EAGAIN; | |
1201 | smb_read_data = NULL; | |
1202 | while (rc == -EAGAIN) { | |
1203 | if ((open_file->invalidHandle) && | |
1204 | (!open_file->closePend)) { | |
1205 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1206 | file, TRUE); | |
1207 | if (rc != 0) | |
1208 | break; | |
1209 | } | |
1210 | ||
1211 | rc = CIFSSMBRead(xid, pTcon, | |
1212 | open_file->netfid, | |
1213 | current_read_size, *poffset, | |
1214 | &bytes_read, &smb_read_data); | |
1215 | ||
1216 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1217 | if (copy_to_user(current_offset, | |
1218 | smb_read_data + 4 /* RFC1001 hdr */ | |
1219 | + le16_to_cpu(pSMBr->DataOffset), | |
1220 | bytes_read)) { | |
1221 | rc = -EFAULT; | |
1222 | FreeXid(xid); | |
1223 | return rc; | |
1224 | } | |
1225 | if (smb_read_data) { | |
1226 | cifs_buf_release(smb_read_data); | |
1227 | smb_read_data = NULL; | |
1228 | } | |
1229 | } | |
1230 | if (rc || (bytes_read == 0)) { | |
1231 | if (total_read) { | |
1232 | break; | |
1233 | } else { | |
1234 | FreeXid(xid); | |
1235 | return rc; | |
1236 | } | |
1237 | } else { | |
1238 | #ifdef CONFIG_CIFS_STATS | |
1239 | atomic_inc(&pTcon->num_reads); | |
1240 | spin_lock(&pTcon->stat_lock); | |
1241 | pTcon->bytes_read += total_read; | |
1242 | spin_unlock(&pTcon->stat_lock); | |
1243 | #endif | |
1244 | *poffset += bytes_read; | |
1245 | } | |
1246 | } | |
1247 | FreeXid(xid); | |
1248 | return total_read; | |
1249 | } | |
1250 | ||
1251 | ||
1252 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1253 | loff_t *poffset) | |
1254 | { | |
1255 | int rc = -EACCES; | |
1256 | unsigned int bytes_read = 0; | |
1257 | unsigned int total_read; | |
1258 | unsigned int current_read_size; | |
1259 | struct cifs_sb_info *cifs_sb; | |
1260 | struct cifsTconInfo *pTcon; | |
1261 | int xid; | |
1262 | char *current_offset; | |
1263 | struct cifsFileInfo *open_file; | |
1264 | ||
1265 | xid = GetXid(); | |
1266 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1267 | pTcon = cifs_sb->tcon; | |
1268 | ||
1269 | if (file->private_data == NULL) { | |
1270 | FreeXid(xid); | |
1271 | return -EBADF; | |
1272 | } | |
1273 | open_file = (struct cifsFileInfo *)file->private_data; | |
1274 | ||
1275 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1276 | cFYI(1, ("attempting read on write only file instance")); | |
1277 | ||
1278 | for (total_read = 0, current_offset = read_data; | |
1279 | read_size > total_read; | |
1280 | total_read += bytes_read, current_offset += bytes_read) { | |
1281 | current_read_size = min_t(const int, read_size - total_read, | |
1282 | cifs_sb->rsize); | |
1283 | rc = -EAGAIN; | |
1284 | while (rc == -EAGAIN) { | |
1285 | if ((open_file->invalidHandle) && | |
1286 | (!open_file->closePend)) { | |
1287 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1288 | file, TRUE); | |
1289 | if (rc != 0) | |
1290 | break; | |
1291 | } | |
1292 | ||
1293 | rc = CIFSSMBRead(xid, pTcon, | |
1294 | open_file->netfid, | |
1295 | current_read_size, *poffset, | |
1296 | &bytes_read, ¤t_offset); | |
1297 | } | |
1298 | if (rc || (bytes_read == 0)) { | |
1299 | if (total_read) { | |
1300 | break; | |
1301 | } else { | |
1302 | FreeXid(xid); | |
1303 | return rc; | |
1304 | } | |
1305 | } else { | |
1306 | #ifdef CONFIG_CIFS_STATS | |
1307 | atomic_inc(&pTcon->num_reads); | |
1308 | spin_lock(&pTcon->stat_lock); | |
1309 | pTcon->bytes_read += total_read; | |
1310 | spin_unlock(&pTcon->stat_lock); | |
1311 | #endif | |
1312 | *poffset += bytes_read; | |
1313 | } | |
1314 | } | |
1315 | FreeXid(xid); | |
1316 | return total_read; | |
1317 | } | |
1318 | ||
1319 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1320 | { | |
1321 | struct dentry *dentry = file->f_dentry; | |
1322 | int rc, xid; | |
1323 | ||
1324 | xid = GetXid(); | |
1325 | rc = cifs_revalidate(dentry); | |
1326 | if (rc) { | |
1327 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1328 | FreeXid(xid); | |
1329 | return rc; | |
1330 | } | |
1331 | rc = generic_file_mmap(file, vma); | |
1332 | FreeXid(xid); | |
1333 | return rc; | |
1334 | } | |
1335 | ||
1336 | ||
1337 | static void cifs_copy_cache_pages(struct address_space *mapping, | |
1338 | struct list_head *pages, int bytes_read, char *data, | |
1339 | struct pagevec *plru_pvec) | |
1340 | { | |
1341 | struct page *page; | |
1342 | char *target; | |
1343 | ||
1344 | while (bytes_read > 0) { | |
1345 | if (list_empty(pages)) | |
1346 | break; | |
1347 | ||
1348 | page = list_entry(pages->prev, struct page, lru); | |
1349 | list_del(&page->lru); | |
1350 | ||
1351 | if (add_to_page_cache(page, mapping, page->index, | |
1352 | GFP_KERNEL)) { | |
1353 | page_cache_release(page); | |
1354 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1355 | data += PAGE_CACHE_SIZE; |
1356 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1357 | continue; |
1358 | } | |
1359 | ||
1360 | target = kmap_atomic(page,KM_USER0); | |
1361 | ||
1362 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1363 | memcpy(target, data, bytes_read); | |
1364 | /* zero the tail end of this partial page */ | |
1365 | memset(target + bytes_read, 0, | |
1366 | PAGE_CACHE_SIZE - bytes_read); | |
1367 | bytes_read = 0; | |
1368 | } else { | |
1369 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1370 | bytes_read -= PAGE_CACHE_SIZE; | |
1371 | } | |
1372 | kunmap_atomic(target, KM_USER0); | |
1373 | ||
1374 | flush_dcache_page(page); | |
1375 | SetPageUptodate(page); | |
1376 | unlock_page(page); | |
1377 | if (!pagevec_add(plru_pvec, page)) | |
1378 | __pagevec_lru_add(plru_pvec); | |
1379 | data += PAGE_CACHE_SIZE; | |
1380 | } | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1385 | struct list_head *page_list, unsigned num_pages) | |
1386 | { | |
1387 | int rc = -EACCES; | |
1388 | int xid; | |
1389 | loff_t offset; | |
1390 | struct page *page; | |
1391 | struct cifs_sb_info *cifs_sb; | |
1392 | struct cifsTconInfo *pTcon; | |
1393 | int bytes_read = 0; | |
1394 | unsigned int read_size,i; | |
1395 | char *smb_read_data = NULL; | |
1396 | struct smb_com_read_rsp *pSMBr; | |
1397 | struct pagevec lru_pvec; | |
1398 | struct cifsFileInfo *open_file; | |
1399 | ||
1400 | xid = GetXid(); | |
1401 | if (file->private_data == NULL) { | |
1402 | FreeXid(xid); | |
1403 | return -EBADF; | |
1404 | } | |
1405 | open_file = (struct cifsFileInfo *)file->private_data; | |
1406 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1407 | pTcon = cifs_sb->tcon; | |
1408 | ||
1409 | pagevec_init(&lru_pvec, 0); | |
1410 | ||
1411 | for (i = 0; i < num_pages; ) { | |
1412 | unsigned contig_pages; | |
1413 | struct page *tmp_page; | |
1414 | unsigned long expected_index; | |
1415 | ||
1416 | if (list_empty(page_list)) | |
1417 | break; | |
1418 | ||
1419 | page = list_entry(page_list->prev, struct page, lru); | |
1420 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1421 | ||
1422 | /* count adjacent pages that we will read into */ | |
1423 | contig_pages = 0; | |
1424 | expected_index = | |
1425 | list_entry(page_list->prev, struct page, lru)->index; | |
1426 | list_for_each_entry_reverse(tmp_page,page_list,lru) { | |
1427 | if (tmp_page->index == expected_index) { | |
1428 | contig_pages++; | |
1429 | expected_index++; | |
1430 | } else | |
1431 | break; | |
1432 | } | |
1433 | if (contig_pages + i > num_pages) | |
1434 | contig_pages = num_pages - i; | |
1435 | ||
1436 | /* for reads over a certain size could initiate async | |
1437 | read ahead */ | |
1438 | ||
1439 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1440 | /* Read size needs to be in multiples of one page */ | |
1441 | read_size = min_t(const unsigned int, read_size, | |
1442 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
1443 | ||
1444 | rc = -EAGAIN; | |
1445 | while (rc == -EAGAIN) { | |
1446 | if ((open_file->invalidHandle) && | |
1447 | (!open_file->closePend)) { | |
1448 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1449 | file, TRUE); | |
1450 | if (rc != 0) | |
1451 | break; | |
1452 | } | |
1453 | ||
1454 | rc = CIFSSMBRead(xid, pTcon, | |
1455 | open_file->netfid, | |
1456 | read_size, offset, | |
1457 | &bytes_read, &smb_read_data); | |
1458 | /* BB need to check return code here */ | |
1459 | if (rc== -EAGAIN) { | |
1460 | if (smb_read_data) { | |
1461 | cifs_buf_release(smb_read_data); | |
1462 | smb_read_data = NULL; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1467 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1468 | /* clean up remaing pages off list */ | |
1469 | while (!list_empty(page_list) && (i < num_pages)) { | |
1470 | page = list_entry(page_list->prev, struct page, | |
1471 | lru); | |
1472 | list_del(&page->lru); | |
1473 | page_cache_release(page); | |
1474 | } | |
1475 | break; | |
1476 | } else if (bytes_read > 0) { | |
1477 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1478 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1479 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1480 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1481 | ||
1482 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
1483 | #ifdef CONFIG_CIFS_STATS | |
1484 | atomic_inc(&pTcon->num_reads); | |
1485 | spin_lock(&pTcon->stat_lock); | |
1486 | pTcon->bytes_read += bytes_read; | |
1487 | spin_unlock(&pTcon->stat_lock); | |
1488 | #endif | |
1489 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { | |
1490 | i++; /* account for partial page */ | |
1491 | ||
1492 | /* server copy of file can have smaller size | |
1493 | than client */ | |
1494 | /* BB do we need to verify this common case ? | |
1495 | this case is ok - if we are at server EOF | |
1496 | we will hit it on next read */ | |
1497 | ||
1498 | /* while (!list_empty(page_list) && (i < num_pages)) { | |
1499 | page = list_entry(page_list->prev, | |
1500 | struct page, list); | |
1501 | list_del(&page->list); | |
1502 | page_cache_release(page); | |
1503 | } | |
1504 | break; */ | |
1505 | } | |
1506 | } else { | |
1507 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1508 | "Cleaning remaining pages from readahead list", | |
1509 | bytes_read, offset)); | |
1510 | /* BB turn off caching and do new lookup on | |
1511 | file size at server? */ | |
1512 | while (!list_empty(page_list) && (i < num_pages)) { | |
1513 | page = list_entry(page_list->prev, struct page, | |
1514 | lru); | |
1515 | list_del(&page->lru); | |
1516 | ||
1517 | /* BB removeme - replace with zero of page? */ | |
1518 | page_cache_release(page); | |
1519 | } | |
1520 | break; | |
1521 | } | |
1522 | if (smb_read_data) { | |
1523 | cifs_buf_release(smb_read_data); | |
1524 | smb_read_data = NULL; | |
1525 | } | |
1526 | bytes_read = 0; | |
1527 | } | |
1528 | ||
1529 | pagevec_lru_add(&lru_pvec); | |
1530 | ||
1531 | /* need to free smb_read_data buf before exit */ | |
1532 | if (smb_read_data) { | |
1533 | cifs_buf_release(smb_read_data); | |
1534 | smb_read_data = NULL; | |
1535 | } | |
1536 | ||
1537 | FreeXid(xid); | |
1538 | return rc; | |
1539 | } | |
1540 | ||
1541 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1542 | loff_t *poffset) | |
1543 | { | |
1544 | char *read_data; | |
1545 | int rc; | |
1546 | ||
1547 | page_cache_get(page); | |
1548 | read_data = kmap(page); | |
1549 | /* for reads over a certain size could initiate async read ahead */ | |
1550 | ||
1551 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); | |
1552 | ||
1553 | if (rc < 0) | |
1554 | goto io_error; | |
1555 | else | |
1556 | cFYI(1, ("Bytes read %d ",rc)); | |
1557 | ||
1558 | file->f_dentry->d_inode->i_atime = | |
1559 | current_fs_time(file->f_dentry->d_inode->i_sb); | |
1560 | ||
1561 | if (PAGE_CACHE_SIZE > rc) | |
1562 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1563 | ||
1564 | flush_dcache_page(page); | |
1565 | SetPageUptodate(page); | |
1566 | rc = 0; | |
1567 | ||
1568 | io_error: | |
1569 | kunmap(page); | |
1570 | page_cache_release(page); | |
1571 | return rc; | |
1572 | } | |
1573 | ||
1574 | static int cifs_readpage(struct file *file, struct page *page) | |
1575 | { | |
1576 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1577 | int rc = -EACCES; | |
1578 | int xid; | |
1579 | ||
1580 | xid = GetXid(); | |
1581 | ||
1582 | if (file->private_data == NULL) { | |
1583 | FreeXid(xid); | |
1584 | return -EBADF; | |
1585 | } | |
1586 | ||
1587 | cFYI(1, ("readpage %p at offset %d 0x%x\n", | |
1588 | page, (int)offset, (int)offset)); | |
1589 | ||
1590 | rc = cifs_readpage_worker(file, page, &offset); | |
1591 | ||
1592 | unlock_page(page); | |
1593 | ||
1594 | FreeXid(xid); | |
1595 | return rc; | |
1596 | } | |
1597 | ||
1598 | /* We do not want to update the file size from server for inodes | |
1599 | open for write - to avoid races with writepage extending | |
1600 | the file - in the future we could consider allowing | |
1601 | refreshing the inode only on increases in the file size | |
1602 | but this is tricky to do without racing with writebehind | |
1603 | page caching in the current Linux kernel design */ | |
1604 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode) | |
1605 | { | |
1606 | struct list_head *tmp; | |
1607 | struct list_head *tmp1; | |
1608 | struct cifsFileInfo *open_file = NULL; | |
1609 | int rc = TRUE; | |
1610 | ||
1611 | if (cifsInode == NULL) | |
1612 | return rc; | |
1613 | ||
1614 | read_lock(&GlobalSMBSeslock); | |
1615 | list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) { | |
1616 | open_file = list_entry(tmp, struct cifsFileInfo, flist); | |
1617 | if (open_file == NULL) | |
1618 | break; | |
1619 | if (open_file->closePend) | |
1620 | continue; | |
1621 | /* We check if file is open for writing, | |
1622 | BB we could supplement this with a check to see if file size | |
1623 | changes have been flushed to server - ie inode metadata dirty */ | |
1624 | if ((open_file->pfile) && | |
1625 | ((open_file->pfile->f_flags & O_RDWR) || | |
1626 | (open_file->pfile->f_flags & O_WRONLY))) { | |
1627 | rc = FALSE; | |
1628 | break; | |
1629 | } | |
1630 | if (tmp->next == NULL) { | |
1631 | cFYI(1, ("File instance %p removed", tmp)); | |
1632 | break; | |
1633 | } | |
1634 | } | |
1635 | read_unlock(&GlobalSMBSeslock); | |
1636 | return rc; | |
1637 | } | |
1638 | ||
1639 | ||
1640 | static int cifs_prepare_write(struct file *file, struct page *page, | |
1641 | unsigned from, unsigned to) | |
1642 | { | |
1643 | int rc = 0; | |
1644 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1645 | cFYI(1, ("prepare write for page %p from %d to %d",page,from,to)); | |
1646 | if (!PageUptodate(page)) { | |
1647 | /* if (to - from != PAGE_CACHE_SIZE) { | |
1648 | void *kaddr = kmap_atomic(page, KM_USER0); | |
1649 | memset(kaddr, 0, from); | |
1650 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); | |
1651 | flush_dcache_page(page); | |
1652 | kunmap_atomic(kaddr, KM_USER0); | |
1653 | } */ | |
1654 | /* If we are writing a full page it will be up to date, | |
1655 | no need to read from the server */ | |
1656 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) | |
1657 | SetPageUptodate(page); | |
1658 | ||
1659 | /* might as well read a page, it is fast enough */ | |
1660 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1661 | rc = cifs_readpage_worker(file, page, &offset); | |
1662 | } else { | |
1663 | /* should we try using another file handle if there is one - | |
1664 | how would we lock it to prevent close of that handle | |
1665 | racing with this read? | |
1666 | In any case this will be written out by commit_write */ | |
1667 | } | |
1668 | } | |
1669 | ||
1670 | /* BB should we pass any errors back? | |
1671 | e.g. if we do not have read access to the file */ | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | struct address_space_operations cifs_addr_ops = { | |
1676 | .readpage = cifs_readpage, | |
1677 | .readpages = cifs_readpages, | |
1678 | .writepage = cifs_writepage, | |
1679 | .prepare_write = cifs_prepare_write, | |
1680 | .commit_write = cifs_commit_write, | |
1681 | .set_page_dirty = __set_page_dirty_nobuffers, | |
1682 | /* .sync_page = cifs_sync_page, */ | |
1683 | /* .direct_IO = */ | |
1684 | }; |