Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
5 | * | |
6 | * Copyright (C) International Business Machines Corp., 2002,2003 | |
7 | * Author(s): Steve French (sfrench@us.ibm.com) | |
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> | |
37c0eb46 | 24 | #include <linux/backing-dev.h> |
1da177e4 LT |
25 | #include <linux/stat.h> |
26 | #include <linux/fcntl.h> | |
37c0eb46 | 27 | #include <linux/mpage.h> |
1da177e4 LT |
28 | #include <linux/pagemap.h> |
29 | #include <linux/pagevec.h> | |
30 | #include <linux/smp_lock.h> | |
37c0eb46 | 31 | #include <linux/writeback.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
1da177e4 LT |
33 | #include <asm/div64.h> |
34 | #include "cifsfs.h" | |
35 | #include "cifspdu.h" | |
36 | #include "cifsglob.h" | |
37 | #include "cifsproto.h" | |
38 | #include "cifs_unicode.h" | |
39 | #include "cifs_debug.h" | |
40 | #include "cifs_fs_sb.h" | |
41 | ||
42 | static inline struct cifsFileInfo *cifs_init_private( | |
43 | struct cifsFileInfo *private_data, struct inode *inode, | |
44 | struct file *file, __u16 netfid) | |
45 | { | |
46 | memset(private_data, 0, sizeof(struct cifsFileInfo)); | |
47 | private_data->netfid = netfid; | |
48 | private_data->pid = current->tgid; | |
49 | init_MUTEX(&private_data->fh_sem); | |
50 | private_data->pfile = file; /* needed for writepage */ | |
51 | private_data->pInode = inode; | |
52 | private_data->invalidHandle = FALSE; | |
53 | private_data->closePend = FALSE; | |
23e7dd7d SF |
54 | /* we have to track num writers to the inode, since writepages |
55 | does not tell us which handle the write is for so there can | |
56 | be a close (overlapping with write) of the filehandle that | |
57 | cifs_writepages chose to use */ | |
58 | atomic_set(&private_data->wrtPending,0); | |
1da177e4 LT |
59 | |
60 | return private_data; | |
61 | } | |
62 | ||
63 | static inline int cifs_convert_flags(unsigned int flags) | |
64 | { | |
65 | if ((flags & O_ACCMODE) == O_RDONLY) | |
66 | return GENERIC_READ; | |
67 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
68 | return GENERIC_WRITE; | |
69 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
70 | /* GENERIC_ALL is too much permission to request | |
71 | can cause unnecessary access denied on create */ | |
72 | /* return GENERIC_ALL; */ | |
73 | return (GENERIC_READ | GENERIC_WRITE); | |
74 | } | |
75 | ||
76 | return 0x20197; | |
77 | } | |
78 | ||
79 | static inline int cifs_get_disposition(unsigned int flags) | |
80 | { | |
81 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
82 | return FILE_CREATE; | |
83 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
84 | return FILE_OVERWRITE_IF; | |
85 | else if ((flags & O_CREAT) == O_CREAT) | |
86 | return FILE_OPEN_IF; | |
55aa2e09 SF |
87 | else if ((flags & O_TRUNC) == O_TRUNC) |
88 | return FILE_OVERWRITE; | |
1da177e4 LT |
89 | else |
90 | return FILE_OPEN; | |
91 | } | |
92 | ||
93 | /* all arguments to this function must be checked for validity in caller */ | |
94 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
95 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
96 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
97 | char *full_path, int xid) | |
98 | { | |
99 | struct timespec temp; | |
100 | int rc; | |
101 | ||
102 | /* want handles we can use to read with first | |
103 | in the list so we do not have to walk the | |
104 | list to search for one in prepare_write */ | |
105 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
106 | list_add_tail(&pCifsFile->flist, | |
107 | &pCifsInode->openFileList); | |
108 | } else { | |
109 | list_add(&pCifsFile->flist, | |
110 | &pCifsInode->openFileList); | |
111 | } | |
112 | write_unlock(&GlobalSMBSeslock); | |
113 | write_unlock(&file->f_owner.lock); | |
114 | if (pCifsInode->clientCanCacheRead) { | |
115 | /* we have the inode open somewhere else | |
116 | no need to discard cache data */ | |
117 | goto client_can_cache; | |
118 | } | |
119 | ||
120 | /* BB need same check in cifs_create too? */ | |
121 | /* if not oplocked, invalidate inode pages if mtime or file | |
122 | size changed */ | |
123 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
124 | if (timespec_equal(&file->f_dentry->d_inode->i_mtime, &temp) && | |
125 | (file->f_dentry->d_inode->i_size == | |
126 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
127 | cFYI(1, ("inode unchanged on server")); | |
128 | } else { | |
129 | if (file->f_dentry->d_inode->i_mapping) { | |
130 | /* BB no need to lock inode until after invalidate | |
131 | since namei code should already have it locked? */ | |
28fd1298 | 132 | filemap_write_and_wait(file->f_dentry->d_inode->i_mapping); |
1da177e4 LT |
133 | } |
134 | cFYI(1, ("invalidating remote inode since open detected it " | |
135 | "changed")); | |
136 | invalidate_remote_inode(file->f_dentry->d_inode); | |
137 | } | |
138 | ||
139 | client_can_cache: | |
140 | if (pTcon->ses->capabilities & CAP_UNIX) | |
141 | rc = cifs_get_inode_info_unix(&file->f_dentry->d_inode, | |
142 | full_path, inode->i_sb, xid); | |
143 | else | |
144 | rc = cifs_get_inode_info(&file->f_dentry->d_inode, | |
145 | full_path, buf, inode->i_sb, xid); | |
146 | ||
147 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
148 | pCifsInode->clientCanCacheAll = TRUE; | |
149 | pCifsInode->clientCanCacheRead = TRUE; | |
150 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
151 | file->f_dentry->d_inode)); | |
152 | } else if ((*oplock & 0xF) == OPLOCK_READ) | |
153 | pCifsInode->clientCanCacheRead = TRUE; | |
154 | ||
155 | return rc; | |
156 | } | |
157 | ||
158 | int cifs_open(struct inode *inode, struct file *file) | |
159 | { | |
160 | int rc = -EACCES; | |
161 | int xid, oplock; | |
162 | struct cifs_sb_info *cifs_sb; | |
163 | struct cifsTconInfo *pTcon; | |
164 | struct cifsFileInfo *pCifsFile; | |
165 | struct cifsInodeInfo *pCifsInode; | |
166 | struct list_head *tmp; | |
167 | char *full_path = NULL; | |
168 | int desiredAccess; | |
169 | int disposition; | |
170 | __u16 netfid; | |
171 | FILE_ALL_INFO *buf = NULL; | |
172 | ||
173 | xid = GetXid(); | |
174 | ||
175 | cifs_sb = CIFS_SB(inode->i_sb); | |
176 | pTcon = cifs_sb->tcon; | |
177 | ||
178 | if (file->f_flags & O_CREAT) { | |
179 | /* search inode for this file and fill in file->private_data */ | |
180 | pCifsInode = CIFS_I(file->f_dentry->d_inode); | |
181 | read_lock(&GlobalSMBSeslock); | |
182 | list_for_each(tmp, &pCifsInode->openFileList) { | |
183 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
184 | flist); | |
185 | if ((pCifsFile->pfile == NULL) && | |
186 | (pCifsFile->pid == current->tgid)) { | |
187 | /* mode set in cifs_create */ | |
188 | ||
189 | /* needed for writepage */ | |
190 | pCifsFile->pfile = file; | |
191 | ||
192 | file->private_data = pCifsFile; | |
193 | break; | |
194 | } | |
195 | } | |
196 | read_unlock(&GlobalSMBSeslock); | |
197 | if (file->private_data != NULL) { | |
198 | rc = 0; | |
199 | FreeXid(xid); | |
200 | return rc; | |
201 | } else { | |
202 | if (file->f_flags & O_EXCL) | |
203 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 204 | "new file %p", file)); |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
7f57356b | 208 | full_path = build_path_from_dentry(file->f_dentry); |
1da177e4 LT |
209 | if (full_path == NULL) { |
210 | FreeXid(xid); | |
211 | return -ENOMEM; | |
212 | } | |
213 | ||
214 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
215 | inode, file->f_flags, full_path)); | |
216 | desiredAccess = cifs_convert_flags(file->f_flags); | |
217 | ||
218 | /********************************************************************* | |
219 | * open flag mapping table: | |
220 | * | |
221 | * POSIX Flag CIFS Disposition | |
222 | * ---------- ---------------- | |
223 | * O_CREAT FILE_OPEN_IF | |
224 | * O_CREAT | O_EXCL FILE_CREATE | |
225 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
226 | * O_TRUNC FILE_OVERWRITE | |
227 | * none of the above FILE_OPEN | |
228 | * | |
229 | * Note that there is not a direct match between disposition | |
230 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
231 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
232 | * file rather than creating a new file as FILE_SUPERSEDE does | |
233 | * (which uses the attributes / metadata passed in on open call) | |
234 | *? | |
235 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
236 | *? and the read write flags match reasonably. O_LARGEFILE | |
237 | *? is irrelevant because largefile support is always used | |
238 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
239 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
240 | *********************************************************************/ | |
241 | ||
242 | disposition = cifs_get_disposition(file->f_flags); | |
243 | ||
244 | if (oplockEnabled) | |
245 | oplock = REQ_OPLOCK; | |
246 | else | |
247 | oplock = FALSE; | |
248 | ||
249 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
250 | ||
251 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
252 | and calling get_inode_info with returned buf (at least helps | |
253 | non-Unix server case) */ | |
254 | ||
255 | /* BB we can not do this if this is the second open of a file | |
256 | and the first handle has writebehind data, we might be | |
257 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ | |
258 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
259 | if (!buf) { | |
260 | rc = -ENOMEM; | |
261 | goto out; | |
262 | } | |
263 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, | |
264 | CREATE_NOT_DIR, &netfid, &oplock, buf, | |
737b758c SF |
265 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
266 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
a9d02ad4 SF |
267 | if (rc == -EIO) { |
268 | /* Old server, try legacy style OpenX */ | |
269 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
270 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
271 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
272 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
273 | } | |
1da177e4 | 274 | if (rc) { |
26a21b98 | 275 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
276 | goto out; |
277 | } | |
278 | file->private_data = | |
279 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
280 | if (file->private_data == NULL) { | |
281 | rc = -ENOMEM; | |
282 | goto out; | |
283 | } | |
284 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
285 | write_lock(&file->f_owner.lock); | |
286 | write_lock(&GlobalSMBSeslock); | |
287 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
288 | ||
289 | pCifsInode = CIFS_I(file->f_dentry->d_inode); | |
290 | if (pCifsInode) { | |
291 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
292 | pCifsFile, pTcon, | |
293 | &oplock, buf, full_path, xid); | |
294 | } else { | |
295 | write_unlock(&GlobalSMBSeslock); | |
296 | write_unlock(&file->f_owner.lock); | |
297 | } | |
298 | ||
299 | if (oplock & CIFS_CREATE_ACTION) { | |
300 | /* time to set mode which we can not set earlier due to | |
301 | problems creating new read-only files */ | |
302 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) { | |
303 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, | |
304 | inode->i_mode, | |
305 | (__u64)-1, (__u64)-1, 0 /* dev */, | |
737b758c SF |
306 | cifs_sb->local_nls, |
307 | cifs_sb->mnt_cifs_flags & | |
308 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
309 | } else { |
310 | /* BB implement via Windows security descriptors eg | |
311 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, | |
312 | -1, -1, local_nls); | |
313 | in the meantime could set r/o dos attribute when | |
314 | perms are eg: mode & 0222 == 0 */ | |
315 | } | |
316 | } | |
317 | ||
318 | out: | |
319 | kfree(buf); | |
320 | kfree(full_path); | |
321 | FreeXid(xid); | |
322 | return rc; | |
323 | } | |
324 | ||
325 | /* Try to reaquire byte range locks that were released when session */ | |
326 | /* to server was lost */ | |
327 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
328 | { | |
329 | int rc = 0; | |
330 | ||
331 | /* BB list all locks open on this file and relock */ | |
332 | ||
333 | return rc; | |
334 | } | |
335 | ||
336 | static int cifs_reopen_file(struct inode *inode, struct file *file, | |
337 | int can_flush) | |
338 | { | |
339 | int rc = -EACCES; | |
340 | int xid, oplock; | |
341 | struct cifs_sb_info *cifs_sb; | |
342 | struct cifsTconInfo *pTcon; | |
343 | struct cifsFileInfo *pCifsFile; | |
344 | struct cifsInodeInfo *pCifsInode; | |
345 | char *full_path = NULL; | |
346 | int desiredAccess; | |
347 | int disposition = FILE_OPEN; | |
348 | __u16 netfid; | |
349 | ||
350 | if (inode == NULL) | |
351 | return -EBADF; | |
352 | if (file->private_data) { | |
353 | pCifsFile = (struct cifsFileInfo *)file->private_data; | |
354 | } else | |
355 | return -EBADF; | |
356 | ||
357 | xid = GetXid(); | |
358 | down(&pCifsFile->fh_sem); | |
359 | if (pCifsFile->invalidHandle == FALSE) { | |
360 | up(&pCifsFile->fh_sem); | |
361 | FreeXid(xid); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | if (file->f_dentry == NULL) { | |
366 | up(&pCifsFile->fh_sem); | |
367 | cFYI(1, ("failed file reopen, no valid name if dentry freed")); | |
368 | FreeXid(xid); | |
369 | return -EBADF; | |
370 | } | |
371 | cifs_sb = CIFS_SB(inode->i_sb); | |
372 | pTcon = cifs_sb->tcon; | |
373 | /* can not grab rename sem here because various ops, including | |
374 | those that already have the rename sem can end up causing writepage | |
375 | to get called and if the server was down that means we end up here, | |
376 | and we can never tell if the caller already has the rename_sem */ | |
7f57356b | 377 | full_path = build_path_from_dentry(file->f_dentry); |
1da177e4 LT |
378 | if (full_path == NULL) { |
379 | up(&pCifsFile->fh_sem); | |
380 | FreeXid(xid); | |
381 | return -ENOMEM; | |
382 | } | |
383 | ||
384 | cFYI(1, (" inode = 0x%p file flags are 0x%x for %s", | |
385 | inode, file->f_flags,full_path)); | |
386 | desiredAccess = cifs_convert_flags(file->f_flags); | |
387 | ||
388 | if (oplockEnabled) | |
389 | oplock = REQ_OPLOCK; | |
390 | else | |
391 | oplock = FALSE; | |
392 | ||
393 | /* Can not refresh inode by passing in file_info buf to be returned | |
394 | by SMBOpen and then calling get_inode_info with returned buf | |
395 | since file might have write behind data that needs to be flushed | |
396 | and server version of file size can be stale. If we knew for sure | |
397 | that inode was not dirty locally we could do this */ | |
398 | ||
399 | /* buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
400 | if (buf == 0) { | |
401 | up(&pCifsFile->fh_sem); | |
402 | kfree(full_path); | |
403 | FreeXid(xid); | |
404 | return -ENOMEM; | |
405 | } */ | |
406 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, | |
407 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
737b758c SF |
408 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
409 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
410 | if (rc) { |
411 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
412 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
413 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 LT |
414 | } else { |
415 | pCifsFile->netfid = netfid; | |
416 | pCifsFile->invalidHandle = FALSE; | |
417 | up(&pCifsFile->fh_sem); | |
418 | pCifsInode = CIFS_I(inode); | |
419 | if (pCifsInode) { | |
420 | if (can_flush) { | |
28fd1298 | 421 | filemap_write_and_wait(inode->i_mapping); |
1da177e4 LT |
422 | /* temporarily disable caching while we |
423 | go to server to get inode info */ | |
424 | pCifsInode->clientCanCacheAll = FALSE; | |
425 | pCifsInode->clientCanCacheRead = FALSE; | |
426 | if (pTcon->ses->capabilities & CAP_UNIX) | |
427 | rc = cifs_get_inode_info_unix(&inode, | |
428 | full_path, inode->i_sb, xid); | |
429 | else | |
430 | rc = cifs_get_inode_info(&inode, | |
431 | full_path, NULL, inode->i_sb, | |
432 | xid); | |
433 | } /* else we are writing out data to server already | |
434 | and could deadlock if we tried to flush data, and | |
435 | since we do not know if we have data that would | |
436 | invalidate the current end of file on the server | |
437 | we can not go to the server to get the new inod | |
438 | info */ | |
439 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
440 | pCifsInode->clientCanCacheAll = TRUE; | |
441 | pCifsInode->clientCanCacheRead = TRUE; | |
442 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
443 | file->f_dentry->d_inode)); | |
444 | } else if ((oplock & 0xF) == OPLOCK_READ) { | |
445 | pCifsInode->clientCanCacheRead = TRUE; | |
446 | pCifsInode->clientCanCacheAll = FALSE; | |
447 | } else { | |
448 | pCifsInode->clientCanCacheRead = FALSE; | |
449 | pCifsInode->clientCanCacheAll = FALSE; | |
450 | } | |
451 | cifs_relock_file(pCifsFile); | |
452 | } | |
453 | } | |
454 | ||
455 | kfree(full_path); | |
456 | FreeXid(xid); | |
457 | return rc; | |
458 | } | |
459 | ||
460 | int cifs_close(struct inode *inode, struct file *file) | |
461 | { | |
462 | int rc = 0; | |
463 | int xid; | |
464 | struct cifs_sb_info *cifs_sb; | |
465 | struct cifsTconInfo *pTcon; | |
466 | struct cifsFileInfo *pSMBFile = | |
467 | (struct cifsFileInfo *)file->private_data; | |
468 | ||
469 | xid = GetXid(); | |
470 | ||
471 | cifs_sb = CIFS_SB(inode->i_sb); | |
472 | pTcon = cifs_sb->tcon; | |
473 | if (pSMBFile) { | |
474 | pSMBFile->closePend = TRUE; | |
475 | write_lock(&file->f_owner.lock); | |
476 | if (pTcon) { | |
477 | /* no sense reconnecting to close a file that is | |
478 | already closed */ | |
479 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
23e7dd7d SF |
480 | int timeout = 2; |
481 | while((atomic_read(&pSMBFile->wrtPending) != 0) | |
482 | && (timeout < 1000) ) { | |
483 | /* Give write a better chance to get to | |
484 | server ahead of the close. We do not | |
485 | want to add a wait_q here as it would | |
486 | increase the memory utilization as | |
487 | the struct would be in each open file, | |
488 | but this should give enough time to | |
489 | clear the socket */ | |
c119b87d | 490 | write_unlock(&file->f_owner.lock); |
23e7dd7d SF |
491 | cERROR(1,("close with pending writes")); |
492 | msleep(timeout); | |
c119b87d | 493 | write_lock(&file->f_owner.lock); |
23e7dd7d SF |
494 | timeout *= 4; |
495 | } | |
1da177e4 LT |
496 | write_unlock(&file->f_owner.lock); |
497 | rc = CIFSSMBClose(xid, pTcon, | |
498 | pSMBFile->netfid); | |
499 | write_lock(&file->f_owner.lock); | |
500 | } | |
501 | } | |
cbe0476f | 502 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
503 | list_del(&pSMBFile->flist); |
504 | list_del(&pSMBFile->tlist); | |
cbe0476f | 505 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
506 | write_unlock(&file->f_owner.lock); |
507 | kfree(pSMBFile->search_resume_name); | |
508 | kfree(file->private_data); | |
509 | file->private_data = NULL; | |
510 | } else | |
511 | rc = -EBADF; | |
512 | ||
513 | if (list_empty(&(CIFS_I(inode)->openFileList))) { | |
514 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
515 | /* if the file is not open we do not know if we can cache info | |
516 | on this inode, much less write behind and read ahead */ | |
517 | CIFS_I(inode)->clientCanCacheRead = FALSE; | |
518 | CIFS_I(inode)->clientCanCacheAll = FALSE; | |
519 | } | |
520 | if ((rc ==0) && CIFS_I(inode)->write_behind_rc) | |
521 | rc = CIFS_I(inode)->write_behind_rc; | |
522 | FreeXid(xid); | |
523 | return rc; | |
524 | } | |
525 | ||
526 | int cifs_closedir(struct inode *inode, struct file *file) | |
527 | { | |
528 | int rc = 0; | |
529 | int xid; | |
530 | struct cifsFileInfo *pCFileStruct = | |
531 | (struct cifsFileInfo *)file->private_data; | |
532 | char *ptmp; | |
533 | ||
26a21b98 | 534 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
535 | |
536 | xid = GetXid(); | |
537 | ||
538 | if (pCFileStruct) { | |
539 | struct cifsTconInfo *pTcon; | |
540 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
541 | ||
542 | pTcon = cifs_sb->tcon; | |
543 | ||
544 | cFYI(1, ("Freeing private data in close dir")); | |
31ca3bc3 SF |
545 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
546 | (pCFileStruct->invalidHandle == FALSE)) { | |
1da177e4 LT |
547 | pCFileStruct->invalidHandle = TRUE; |
548 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
549 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
550 | rc)); | |
551 | /* not much we can do if it fails anyway, ignore rc */ | |
552 | rc = 0; | |
553 | } | |
554 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
555 | if (ptmp) { | |
ec637e3f | 556 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 557 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
d47d7c1a SF |
558 | if(pCFileStruct->srch_inf.smallBuf) |
559 | cifs_small_buf_release(ptmp); | |
560 | else | |
561 | cifs_buf_release(ptmp); | |
1da177e4 LT |
562 | } |
563 | ptmp = pCFileStruct->search_resume_name; | |
564 | if (ptmp) { | |
ec637e3f | 565 | cFYI(1, ("closedir free resume name")); |
1da177e4 LT |
566 | pCFileStruct->search_resume_name = NULL; |
567 | kfree(ptmp); | |
568 | } | |
569 | kfree(file->private_data); | |
570 | file->private_data = NULL; | |
571 | } | |
572 | /* BB can we lock the filestruct while this is going on? */ | |
573 | FreeXid(xid); | |
574 | return rc; | |
575 | } | |
576 | ||
577 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) | |
578 | { | |
579 | int rc, xid; | |
1da177e4 LT |
580 | __u32 numLock = 0; |
581 | __u32 numUnlock = 0; | |
582 | __u64 length; | |
583 | int wait_flag = FALSE; | |
584 | struct cifs_sb_info *cifs_sb; | |
585 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
586 | __u16 netfid; |
587 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
1da177e4 LT |
588 | |
589 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
590 | rc = -EACCES; | |
591 | xid = GetXid(); | |
592 | ||
593 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
594 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
595 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, | |
596 | pfLock->fl_end)); | |
597 | ||
598 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 599 | cFYI(1, ("Posix")); |
1da177e4 | 600 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 601 | cFYI(1, ("Flock")); |
1da177e4 | 602 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 603 | cFYI(1, ("Blocking lock")); |
1da177e4 LT |
604 | wait_flag = TRUE; |
605 | } | |
606 | if (pfLock->fl_flags & FL_ACCESS) | |
607 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 608 | "not implemented yet")); |
1da177e4 LT |
609 | if (pfLock->fl_flags & FL_LEASE) |
610 | cFYI(1, ("Lease on file - not implemented yet")); | |
611 | if (pfLock->fl_flags & | |
612 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) | |
613 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
614 | ||
615 | if (pfLock->fl_type == F_WRLCK) { | |
616 | cFYI(1, ("F_WRLCK ")); | |
617 | numLock = 1; | |
618 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 619 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 620 | numUnlock = 1; |
d47d7c1a SF |
621 | /* Check if unlock includes more than |
622 | one lock range */ | |
1da177e4 | 623 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 624 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
625 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
626 | numLock = 1; | |
627 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 628 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
629 | numLock = 1; |
630 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 631 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
632 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
633 | numLock = 1; | |
634 | } else | |
d47d7c1a | 635 | cFYI(1, ("Unknown type of lock")); |
1da177e4 LT |
636 | |
637 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
638 | pTcon = cifs_sb->tcon; | |
639 | ||
640 | if (file->private_data == NULL) { | |
641 | FreeXid(xid); | |
642 | return -EBADF; | |
643 | } | |
08547b03 SF |
644 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
645 | ||
1da177e4 | 646 | |
08547b03 SF |
647 | /* BB add code here to normalize offset and length to |
648 | account for negative length which we can not accept over the | |
649 | wire */ | |
1da177e4 | 650 | if (IS_GETLK(cmd)) { |
08547b03 | 651 | if(experimEnabled && |
82940a46 SF |
652 | (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
653 | (CIFS_UNIX_FCNTL_CAP & | |
654 | le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) { | |
08547b03 SF |
655 | int posix_lock_type; |
656 | if(lockType & LOCKING_ANDX_SHARED_LOCK) | |
657 | posix_lock_type = CIFS_RDLCK; | |
658 | else | |
659 | posix_lock_type = CIFS_WRLCK; | |
660 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, | |
fc94cdb9 | 661 | length, pfLock, |
08547b03 SF |
662 | posix_lock_type, wait_flag); |
663 | FreeXid(xid); | |
664 | return rc; | |
665 | } | |
666 | ||
667 | /* BB we could chain these into one lock request BB */ | |
668 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
669 | 0, 1, lockType, 0 /* wait flag */ ); | |
1da177e4 | 670 | if (rc == 0) { |
08547b03 | 671 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
1da177e4 LT |
672 | pfLock->fl_start, 1 /* numUnlock */ , |
673 | 0 /* numLock */ , lockType, | |
674 | 0 /* wait flag */ ); | |
675 | pfLock->fl_type = F_UNLCK; | |
676 | if (rc != 0) | |
677 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 678 | "range %d during test of lock", rc)); |
1da177e4 LT |
679 | rc = 0; |
680 | ||
681 | } else { | |
682 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
683 | rc = 0; /* do not change lock type to unlock | |
684 | since range in use */ | |
685 | } | |
686 | ||
687 | FreeXid(xid); | |
688 | return rc; | |
689 | } | |
08547b03 | 690 | if (experimEnabled && |
82940a46 SF |
691 | (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
692 | (CIFS_UNIX_FCNTL_CAP & | |
693 | le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) { | |
08547b03 SF |
694 | int posix_lock_type; |
695 | if(lockType & LOCKING_ANDX_SHARED_LOCK) | |
696 | posix_lock_type = CIFS_RDLCK; | |
697 | else | |
698 | posix_lock_type = CIFS_WRLCK; | |
699 | ||
700 | if(numUnlock == 1) | |
beb84dc8 | 701 | posix_lock_type = CIFS_UNLCK; |
08547b03 SF |
702 | else if(numLock == 0) { |
703 | /* if no lock or unlock then nothing | |
704 | to do since we do not know what it is */ | |
705 | FreeXid(xid); | |
706 | return -EOPNOTSUPP; | |
707 | } | |
708 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, | |
fc94cdb9 | 709 | length, pfLock, |
08547b03 SF |
710 | posix_lock_type, wait_flag); |
711 | } else | |
712 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
713 | numUnlock, numLock, lockType, wait_flag); | |
d634cc15 | 714 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
715 | posix_lock_file_wait(file, pfLock); |
716 | FreeXid(xid); | |
717 | return rc; | |
718 | } | |
719 | ||
720 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
721 | size_t write_size, loff_t *poffset) | |
722 | { | |
723 | int rc = 0; | |
724 | unsigned int bytes_written = 0; | |
725 | unsigned int total_written; | |
726 | struct cifs_sb_info *cifs_sb; | |
727 | struct cifsTconInfo *pTcon; | |
728 | int xid, long_op; | |
729 | struct cifsFileInfo *open_file; | |
730 | ||
731 | if (file->f_dentry == NULL) | |
732 | return -EBADF; | |
733 | ||
734 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
735 | if (cifs_sb == NULL) | |
736 | return -EBADF; | |
737 | ||
738 | pTcon = cifs_sb->tcon; | |
739 | ||
740 | /* cFYI(1, | |
741 | (" write %d bytes to offset %lld of %s", write_size, | |
742 | *poffset, file->f_dentry->d_name.name)); */ | |
743 | ||
744 | if (file->private_data == NULL) | |
745 | return -EBADF; | |
746 | else | |
747 | open_file = (struct cifsFileInfo *) file->private_data; | |
748 | ||
749 | xid = GetXid(); | |
750 | if (file->f_dentry->d_inode == NULL) { | |
751 | FreeXid(xid); | |
752 | return -EBADF; | |
753 | } | |
754 | ||
755 | if (*poffset > file->f_dentry->d_inode->i_size) | |
756 | long_op = 2; /* writes past end of file can take a long time */ | |
757 | else | |
758 | long_op = 1; | |
759 | ||
760 | for (total_written = 0; write_size > total_written; | |
761 | total_written += bytes_written) { | |
762 | rc = -EAGAIN; | |
763 | while (rc == -EAGAIN) { | |
764 | if (file->private_data == NULL) { | |
765 | /* file has been closed on us */ | |
766 | FreeXid(xid); | |
767 | /* if we have gotten here we have written some data | |
768 | and blocked, and the file has been freed on us while | |
769 | we blocked so return what we managed to write */ | |
770 | return total_written; | |
771 | } | |
772 | if (open_file->closePend) { | |
773 | FreeXid(xid); | |
774 | if (total_written) | |
775 | return total_written; | |
776 | else | |
777 | return -EBADF; | |
778 | } | |
779 | if (open_file->invalidHandle) { | |
780 | if ((file->f_dentry == NULL) || | |
781 | (file->f_dentry->d_inode == NULL)) { | |
782 | FreeXid(xid); | |
783 | return total_written; | |
784 | } | |
785 | /* we could deadlock if we called | |
786 | filemap_fdatawait from here so tell | |
787 | reopen_file not to flush data to server | |
788 | now */ | |
789 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
790 | file, FALSE); | |
791 | if (rc != 0) | |
792 | break; | |
793 | } | |
794 | ||
795 | rc = CIFSSMBWrite(xid, pTcon, | |
796 | open_file->netfid, | |
797 | min_t(const int, cifs_sb->wsize, | |
798 | write_size - total_written), | |
799 | *poffset, &bytes_written, | |
800 | NULL, write_data + total_written, long_op); | |
801 | } | |
802 | if (rc || (bytes_written == 0)) { | |
803 | if (total_written) | |
804 | break; | |
805 | else { | |
806 | FreeXid(xid); | |
807 | return rc; | |
808 | } | |
809 | } else | |
810 | *poffset += bytes_written; | |
811 | long_op = FALSE; /* subsequent writes fast - | |
812 | 15 seconds is plenty */ | |
813 | } | |
814 | ||
a4544347 | 815 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
816 | |
817 | /* since the write may have blocked check these pointers again */ | |
818 | if (file->f_dentry) { | |
819 | if (file->f_dentry->d_inode) { | |
820 | struct inode *inode = file->f_dentry->d_inode; | |
821 | inode->i_ctime = inode->i_mtime = | |
822 | current_fs_time(inode->i_sb); | |
823 | if (total_written > 0) { | |
824 | if (*poffset > file->f_dentry->d_inode->i_size) | |
825 | i_size_write(file->f_dentry->d_inode, | |
826 | *poffset); | |
827 | } | |
828 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
829 | } | |
830 | } | |
831 | FreeXid(xid); | |
832 | return total_written; | |
833 | } | |
834 | ||
835 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
836 | size_t write_size, loff_t *poffset) | |
837 | { | |
838 | int rc = 0; | |
839 | unsigned int bytes_written = 0; | |
840 | unsigned int total_written; | |
841 | struct cifs_sb_info *cifs_sb; | |
842 | struct cifsTconInfo *pTcon; | |
843 | int xid, long_op; | |
844 | struct cifsFileInfo *open_file; | |
845 | ||
846 | if (file->f_dentry == NULL) | |
847 | return -EBADF; | |
848 | ||
849 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
850 | if (cifs_sb == NULL) | |
851 | return -EBADF; | |
852 | ||
853 | pTcon = cifs_sb->tcon; | |
854 | ||
ab2f218f SF |
855 | cFYI(1,("write %zd bytes to offset %lld of %s", write_size, |
856 | *poffset, file->f_dentry->d_name.name)); | |
1da177e4 LT |
857 | |
858 | if (file->private_data == NULL) | |
859 | return -EBADF; | |
860 | else | |
861 | open_file = (struct cifsFileInfo *)file->private_data; | |
862 | ||
863 | xid = GetXid(); | |
864 | if (file->f_dentry->d_inode == NULL) { | |
865 | FreeXid(xid); | |
866 | return -EBADF; | |
867 | } | |
868 | ||
869 | if (*poffset > file->f_dentry->d_inode->i_size) | |
870 | long_op = 2; /* writes past end of file can take a long time */ | |
871 | else | |
872 | long_op = 1; | |
873 | ||
874 | for (total_written = 0; write_size > total_written; | |
875 | total_written += bytes_written) { | |
876 | rc = -EAGAIN; | |
877 | while (rc == -EAGAIN) { | |
878 | if (file->private_data == NULL) { | |
879 | /* file has been closed on us */ | |
880 | FreeXid(xid); | |
881 | /* if we have gotten here we have written some data | |
882 | and blocked, and the file has been freed on us | |
883 | while we blocked so return what we managed to | |
884 | write */ | |
885 | return total_written; | |
886 | } | |
887 | if (open_file->closePend) { | |
888 | FreeXid(xid); | |
889 | if (total_written) | |
890 | return total_written; | |
891 | else | |
892 | return -EBADF; | |
893 | } | |
894 | if (open_file->invalidHandle) { | |
895 | if ((file->f_dentry == NULL) || | |
896 | (file->f_dentry->d_inode == NULL)) { | |
897 | FreeXid(xid); | |
898 | return total_written; | |
899 | } | |
900 | /* we could deadlock if we called | |
901 | filemap_fdatawait from here so tell | |
902 | reopen_file not to flush data to | |
903 | server now */ | |
904 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
905 | file, FALSE); | |
906 | if (rc != 0) | |
907 | break; | |
908 | } | |
c01f36a8 | 909 | if(experimEnabled || (pTcon->ses->server && |
08775834 SF |
910 | ((pTcon->ses->server->secMode & |
911 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
c01f36a8 | 912 | == 0))) { |
3e84469d SF |
913 | struct kvec iov[2]; |
914 | unsigned int len; | |
915 | ||
0ae0efad | 916 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
917 | write_size - total_written); |
918 | /* iov[0] is reserved for smb header */ | |
919 | iov[1].iov_base = (char *)write_data + | |
920 | total_written; | |
921 | iov[1].iov_len = len; | |
d6e04ae6 | 922 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 923 | open_file->netfid, len, |
d6e04ae6 | 924 | *poffset, &bytes_written, |
3e84469d | 925 | iov, 1, long_op); |
d6e04ae6 | 926 | } else |
60808233 SF |
927 | rc = CIFSSMBWrite(xid, pTcon, |
928 | open_file->netfid, | |
929 | min_t(const int, cifs_sb->wsize, | |
930 | write_size - total_written), | |
931 | *poffset, &bytes_written, | |
932 | write_data + total_written, | |
933 | NULL, long_op); | |
1da177e4 LT |
934 | } |
935 | if (rc || (bytes_written == 0)) { | |
936 | if (total_written) | |
937 | break; | |
938 | else { | |
939 | FreeXid(xid); | |
940 | return rc; | |
941 | } | |
942 | } else | |
943 | *poffset += bytes_written; | |
944 | long_op = FALSE; /* subsequent writes fast - | |
945 | 15 seconds is plenty */ | |
946 | } | |
947 | ||
a4544347 | 948 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
949 | |
950 | /* since the write may have blocked check these pointers again */ | |
951 | if (file->f_dentry) { | |
952 | if (file->f_dentry->d_inode) { | |
953 | file->f_dentry->d_inode->i_ctime = | |
954 | file->f_dentry->d_inode->i_mtime = CURRENT_TIME; | |
955 | if (total_written > 0) { | |
956 | if (*poffset > file->f_dentry->d_inode->i_size) | |
957 | i_size_write(file->f_dentry->d_inode, | |
958 | *poffset); | |
959 | } | |
960 | mark_inode_dirty_sync(file->f_dentry->d_inode); | |
961 | } | |
962 | } | |
963 | FreeXid(xid); | |
964 | return total_written; | |
965 | } | |
966 | ||
dd99cd80 | 967 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
968 | { |
969 | struct cifsFileInfo *open_file; | |
dd99cd80 | 970 | int rc; |
6148a742 | 971 | |
60808233 SF |
972 | /* Having a null inode here (because mapping->host was set to zero by |
973 | the VFS or MM) should not happen but we had reports of on oops (due to | |
974 | it being zero) during stress testcases so we need to check for it */ | |
975 | ||
976 | if(cifs_inode == NULL) { | |
977 | cERROR(1,("Null inode passed to cifs_writeable_file")); | |
978 | dump_stack(); | |
979 | return NULL; | |
980 | } | |
981 | ||
6148a742 SF |
982 | read_lock(&GlobalSMBSeslock); |
983 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
984 | if (open_file->closePend) | |
985 | continue; | |
986 | if (open_file->pfile && | |
987 | ((open_file->pfile->f_flags & O_RDWR) || | |
988 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 989 | atomic_inc(&open_file->wrtPending); |
6148a742 | 990 | read_unlock(&GlobalSMBSeslock); |
0ae0efad | 991 | if((open_file->invalidHandle) && |
23e7dd7d | 992 | (!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) { |
dd99cd80 | 993 | rc = cifs_reopen_file(&cifs_inode->vfs_inode, |
37c0eb46 SF |
994 | open_file->pfile, FALSE); |
995 | /* if it fails, try another handle - might be */ | |
996 | /* dangerous to hold up writepages with retry */ | |
997 | if(rc) { | |
4a77118c | 998 | cFYI(1,("failed on reopen file in wp")); |
37c0eb46 | 999 | read_lock(&GlobalSMBSeslock); |
23e7dd7d SF |
1000 | /* can not use this handle, no write |
1001 | pending on this one after all */ | |
1002 | atomic_dec | |
1003 | (&open_file->wrtPending); | |
37c0eb46 SF |
1004 | continue; |
1005 | } | |
1006 | } | |
6148a742 SF |
1007 | return open_file; |
1008 | } | |
1009 | } | |
1010 | read_unlock(&GlobalSMBSeslock); | |
1011 | return NULL; | |
1012 | } | |
1013 | ||
1da177e4 LT |
1014 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1015 | { | |
1016 | struct address_space *mapping = page->mapping; | |
1017 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1018 | char *write_data; | |
1019 | int rc = -EFAULT; | |
1020 | int bytes_written = 0; | |
1021 | struct cifs_sb_info *cifs_sb; | |
1022 | struct cifsTconInfo *pTcon; | |
1023 | struct inode *inode; | |
6148a742 | 1024 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1025 | |
1026 | if (!mapping || !mapping->host) | |
1027 | return -EFAULT; | |
1028 | ||
1029 | inode = page->mapping->host; | |
1030 | cifs_sb = CIFS_SB(inode->i_sb); | |
1031 | pTcon = cifs_sb->tcon; | |
1032 | ||
1033 | offset += (loff_t)from; | |
1034 | write_data = kmap(page); | |
1035 | write_data += from; | |
1036 | ||
1037 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1038 | kunmap(page); | |
1039 | return -EIO; | |
1040 | } | |
1041 | ||
1042 | /* racing with truncate? */ | |
1043 | if (offset > mapping->host->i_size) { | |
1044 | kunmap(page); | |
1045 | return 0; /* don't care */ | |
1046 | } | |
1047 | ||
1048 | /* check to make sure that we are not extending the file */ | |
1049 | if (mapping->host->i_size - offset < (loff_t)to) | |
1050 | to = (unsigned)(mapping->host->i_size - offset); | |
1051 | ||
6148a742 SF |
1052 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1053 | if (open_file) { | |
1054 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1055 | to-from, &offset); | |
23e7dd7d | 1056 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1057 | /* Does mm or vfs already set times? */ |
6148a742 SF |
1058 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
1059 | if ((bytes_written > 0) && (offset)) { | |
1060 | rc = 0; | |
1061 | } else if (bytes_written < 0) { | |
1062 | if (rc != -EBADF) | |
1063 | rc = bytes_written; | |
1da177e4 | 1064 | } |
6148a742 | 1065 | } else { |
1da177e4 LT |
1066 | cFYI(1, ("No writeable filehandles for inode")); |
1067 | rc = -EIO; | |
1068 | } | |
1069 | ||
1070 | kunmap(page); | |
1071 | return rc; | |
1072 | } | |
1073 | ||
1da177e4 | 1074 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1075 | struct writeback_control *wbc) |
1da177e4 | 1076 | { |
37c0eb46 SF |
1077 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1078 | unsigned int bytes_to_write; | |
1079 | unsigned int bytes_written; | |
1080 | struct cifs_sb_info *cifs_sb; | |
1081 | int done = 0; | |
1082 | pgoff_t end = -1; | |
1083 | pgoff_t index; | |
1084 | int is_range = 0; | |
1085 | struct kvec iov[32]; | |
84d2f07e | 1086 | int len; |
37c0eb46 SF |
1087 | int n_iov = 0; |
1088 | pgoff_t next; | |
1089 | int nr_pages; | |
1090 | __u64 offset = 0; | |
23e7dd7d | 1091 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1092 | struct page *page; |
1093 | struct pagevec pvec; | |
1094 | int rc = 0; | |
1095 | int scanned = 0; | |
1da177e4 LT |
1096 | int xid; |
1097 | ||
37c0eb46 SF |
1098 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
1099 | ||
1100 | /* | |
1101 | * If wsize is smaller that the page cache size, default to writing | |
1102 | * one page at a time via cifs_writepage | |
1103 | */ | |
1104 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1105 | return generic_writepages(mapping, wbc); | |
1106 | ||
4a77118c SF |
1107 | if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1108 | if(cifs_sb->tcon->ses->server->secMode & | |
1109 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
60808233 SF |
1110 | if(!experimEnabled) |
1111 | return generic_writepages(mapping, wbc); | |
4a77118c | 1112 | |
37c0eb46 SF |
1113 | /* |
1114 | * BB: Is this meaningful for a non-block-device file system? | |
1115 | * If it is, we should test it again after we do I/O | |
1116 | */ | |
1117 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1118 | wbc->encountered_congestion = 1; | |
1119 | return 0; | |
1120 | } | |
1121 | ||
1da177e4 LT |
1122 | xid = GetXid(); |
1123 | ||
37c0eb46 SF |
1124 | pagevec_init(&pvec, 0); |
1125 | if (wbc->sync_mode == WB_SYNC_NONE) | |
1126 | index = mapping->writeback_index; /* Start from prev offset */ | |
1127 | else { | |
1128 | index = 0; | |
1129 | scanned = 1; | |
1130 | } | |
1131 | if (wbc->start || wbc->end) { | |
1132 | index = wbc->start >> PAGE_CACHE_SHIFT; | |
1133 | end = wbc->end >> PAGE_CACHE_SHIFT; | |
1134 | is_range = 1; | |
1135 | scanned = 1; | |
1136 | } | |
1137 | retry: | |
1138 | while (!done && (index <= end) && | |
1139 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1140 | PAGECACHE_TAG_DIRTY, | |
1141 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1142 | int first; | |
1143 | unsigned int i; | |
1144 | ||
37c0eb46 SF |
1145 | first = -1; |
1146 | next = 0; | |
1147 | n_iov = 0; | |
1148 | bytes_to_write = 0; | |
1149 | ||
1150 | for (i = 0; i < nr_pages; i++) { | |
1151 | page = pvec.pages[i]; | |
1152 | /* | |
1153 | * At this point we hold neither mapping->tree_lock nor | |
1154 | * lock on the page itself: the page may be truncated or | |
1155 | * invalidated (changing page->mapping to NULL), or even | |
1156 | * swizzled back from swapper_space to tmpfs file | |
1157 | * mapping | |
1158 | */ | |
1159 | ||
1160 | if (first < 0) | |
1161 | lock_page(page); | |
1162 | else if (TestSetPageLocked(page)) | |
1163 | break; | |
1164 | ||
1165 | if (unlikely(page->mapping != mapping)) { | |
1166 | unlock_page(page); | |
1167 | break; | |
1168 | } | |
1169 | ||
1170 | if (unlikely(is_range) && (page->index > end)) { | |
1171 | done = 1; | |
1172 | unlock_page(page); | |
1173 | break; | |
1174 | } | |
1175 | ||
1176 | if (next && (page->index != next)) { | |
1177 | /* Not next consecutive page */ | |
1178 | unlock_page(page); | |
1179 | break; | |
1180 | } | |
1181 | ||
1182 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1183 | wait_on_page_writeback(page); | |
1184 | ||
1185 | if (PageWriteback(page) || | |
1186 | !test_clear_page_dirty(page)) { | |
1187 | unlock_page(page); | |
1188 | break; | |
1189 | } | |
84d2f07e SF |
1190 | |
1191 | if (page_offset(page) >= mapping->host->i_size) { | |
1192 | done = 1; | |
1193 | unlock_page(page); | |
1194 | break; | |
1195 | } | |
1196 | ||
37c0eb46 SF |
1197 | /* |
1198 | * BB can we get rid of this? pages are held by pvec | |
1199 | */ | |
1200 | page_cache_get(page); | |
1201 | ||
84d2f07e SF |
1202 | len = min(mapping->host->i_size - page_offset(page), |
1203 | (loff_t)PAGE_CACHE_SIZE); | |
1204 | ||
37c0eb46 SF |
1205 | /* reserve iov[0] for the smb header */ |
1206 | n_iov++; | |
1207 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1208 | iov[n_iov].iov_len = len; |
1209 | bytes_to_write += len; | |
37c0eb46 SF |
1210 | |
1211 | if (first < 0) { | |
1212 | first = i; | |
1213 | offset = page_offset(page); | |
1214 | } | |
1215 | next = page->index + 1; | |
1216 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1217 | break; | |
1218 | } | |
1219 | if (n_iov) { | |
23e7dd7d SF |
1220 | /* Search for a writable handle every time we call |
1221 | * CIFSSMBWrite2. We can't rely on the last handle | |
1222 | * we used to still be valid | |
1223 | */ | |
1224 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1225 | if (!open_file) { | |
1226 | cERROR(1, ("No writable handles for inode")); | |
1227 | rc = -EBADF; | |
1047abc1 | 1228 | } else { |
23e7dd7d SF |
1229 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1230 | open_file->netfid, | |
1231 | bytes_to_write, offset, | |
1232 | &bytes_written, iov, n_iov, | |
1233 | 1); | |
1234 | atomic_dec(&open_file->wrtPending); | |
1235 | if (rc || bytes_written < bytes_to_write) { | |
1236 | cERROR(1,("Write2 ret %d, written = %d", | |
1237 | rc, bytes_written)); | |
1238 | /* BB what if continued retry is | |
1239 | requested via mount flags? */ | |
1240 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1241 | } else { |
1242 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1243 | bytes_written); | |
1244 | } | |
37c0eb46 SF |
1245 | } |
1246 | for (i = 0; i < n_iov; i++) { | |
1247 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1248 | /* Should we also set page error on |
1249 | success rc but too little data written? */ | |
1250 | /* BB investigate retry logic on temporary | |
1251 | server crash cases and how recovery works | |
1252 | when page marked as error */ | |
1253 | if(rc) | |
1254 | SetPageError(page); | |
37c0eb46 SF |
1255 | kunmap(page); |
1256 | unlock_page(page); | |
1257 | page_cache_release(page); | |
1258 | } | |
1259 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1260 | done = 1; | |
1261 | index = next; | |
1262 | } | |
1263 | pagevec_release(&pvec); | |
1264 | } | |
1265 | if (!scanned && !done) { | |
1266 | /* | |
1267 | * We hit the last page and there is more work to be done: wrap | |
1268 | * back to the start of the file | |
1269 | */ | |
1270 | scanned = 1; | |
1271 | index = 0; | |
1272 | goto retry; | |
1273 | } | |
1274 | if (!is_range) | |
1275 | mapping->writeback_index = index; | |
1276 | ||
1da177e4 | 1277 | FreeXid(xid); |
37c0eb46 | 1278 | |
1da177e4 LT |
1279 | return rc; |
1280 | } | |
1da177e4 LT |
1281 | |
1282 | static int cifs_writepage(struct page* page, struct writeback_control *wbc) | |
1283 | { | |
1284 | int rc = -EFAULT; | |
1285 | int xid; | |
1286 | ||
1287 | xid = GetXid(); | |
1288 | /* BB add check for wbc flags */ | |
1289 | page_cache_get(page); | |
1290 | if (!PageUptodate(page)) { | |
1291 | cFYI(1, ("ppw - page not up to date")); | |
1292 | } | |
1293 | ||
1294 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); | |
1295 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1296 | unlock_page(page); | |
1297 | page_cache_release(page); | |
1298 | FreeXid(xid); | |
1299 | return rc; | |
1300 | } | |
1301 | ||
1302 | static int cifs_commit_write(struct file *file, struct page *page, | |
1303 | unsigned offset, unsigned to) | |
1304 | { | |
1305 | int xid; | |
1306 | int rc = 0; | |
1307 | struct inode *inode = page->mapping->host; | |
1308 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1309 | char *page_data; | |
1310 | ||
1311 | xid = GetXid(); | |
1312 | cFYI(1, ("commit write for page %p up to position %lld for %d", | |
1313 | page, position, to)); | |
1314 | if (position > inode->i_size) { | |
1315 | i_size_write(inode, position); | |
1316 | /* if (file->private_data == NULL) { | |
1317 | rc = -EBADF; | |
1318 | } else { | |
1319 | open_file = (struct cifsFileInfo *)file->private_data; | |
1320 | cifs_sb = CIFS_SB(inode->i_sb); | |
1321 | rc = -EAGAIN; | |
1322 | while (rc == -EAGAIN) { | |
1323 | if ((open_file->invalidHandle) && | |
1324 | (!open_file->closePend)) { | |
1325 | rc = cifs_reopen_file( | |
1326 | file->f_dentry->d_inode, file); | |
1327 | if (rc != 0) | |
1328 | break; | |
1329 | } | |
1330 | if (!open_file->closePend) { | |
1331 | rc = CIFSSMBSetFileSize(xid, | |
1332 | cifs_sb->tcon, position, | |
1333 | open_file->netfid, | |
1334 | open_file->pid, FALSE); | |
1335 | } else { | |
1336 | rc = -EBADF; | |
1337 | break; | |
1338 | } | |
1339 | } | |
1340 | cFYI(1, (" SetEOF (commit write) rc = %d", rc)); | |
1341 | } */ | |
1342 | } | |
1343 | if (!PageUptodate(page)) { | |
1344 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1345 | /* can not rely on (or let) writepage write this data */ | |
1346 | if (to < offset) { | |
1347 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1348 | offset, to)); | |
1349 | FreeXid(xid); | |
1350 | return rc; | |
1351 | } | |
1352 | /* this is probably better than directly calling | |
1353 | partialpage_write since in this function the file handle is | |
1354 | known which we might as well leverage */ | |
1355 | /* BB check if anything else missing out of ppw | |
1356 | such as updating last write time */ | |
1357 | page_data = kmap(page); | |
1358 | rc = cifs_write(file, page_data + offset, to-offset, | |
1359 | &position); | |
1360 | if (rc > 0) | |
1361 | rc = 0; | |
1362 | /* else if (rc < 0) should we set writebehind rc? */ | |
1363 | kunmap(page); | |
1364 | } else { | |
1365 | set_page_dirty(page); | |
1366 | } | |
1367 | ||
1368 | FreeXid(xid); | |
1369 | return rc; | |
1370 | } | |
1371 | ||
1372 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1373 | { | |
1374 | int xid; | |
1375 | int rc = 0; | |
1376 | struct inode *inode = file->f_dentry->d_inode; | |
1377 | ||
1378 | xid = GetXid(); | |
1379 | ||
26a21b98 | 1380 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 LT |
1381 | dentry->d_name.name, datasync)); |
1382 | ||
1383 | rc = filemap_fdatawrite(inode->i_mapping); | |
1384 | if (rc == 0) | |
1385 | CIFS_I(inode)->write_behind_rc = 0; | |
1386 | FreeXid(xid); | |
1387 | return rc; | |
1388 | } | |
1389 | ||
3978d717 | 1390 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1391 | { |
1392 | struct address_space *mapping; | |
1393 | struct inode *inode; | |
1394 | unsigned long index = page->index; | |
1395 | unsigned int rpages = 0; | |
1396 | int rc = 0; | |
1397 | ||
1398 | cFYI(1, ("sync page %p",page)); | |
1399 | mapping = page->mapping; | |
1400 | if (!mapping) | |
1401 | return 0; | |
1402 | inode = mapping->host; | |
1403 | if (!inode) | |
3978d717 | 1404 | return; */ |
1da177e4 LT |
1405 | |
1406 | /* fill in rpages then | |
1407 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ | |
1408 | ||
26a21b98 | 1409 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1410 | |
3978d717 | 1411 | #if 0 |
1da177e4 LT |
1412 | if (rc < 0) |
1413 | return rc; | |
1414 | return 0; | |
3978d717 | 1415 | #endif |
1da177e4 LT |
1416 | } */ |
1417 | ||
1418 | /* | |
1419 | * As file closes, flush all cached write data for this inode checking | |
1420 | * for write behind errors. | |
1421 | */ | |
1422 | int cifs_flush(struct file *file) | |
1423 | { | |
1424 | struct inode * inode = file->f_dentry->d_inode; | |
1425 | int rc = 0; | |
1426 | ||
1427 | /* Rather than do the steps manually: | |
1428 | lock the inode for writing | |
1429 | loop through pages looking for write behind data (dirty pages) | |
1430 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1431 | send to server (prefer in parallel) | |
1432 | deal with writebehind errors | |
1433 | unlock inode for writing | |
1434 | filemapfdatawrite appears easier for the time being */ | |
1435 | ||
1436 | rc = filemap_fdatawrite(inode->i_mapping); | |
1437 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1438 | CIFS_I(inode)->write_behind_rc = 0; | |
1439 | ||
1440 | cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc)); | |
1441 | ||
1442 | return rc; | |
1443 | } | |
1444 | ||
1445 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1446 | size_t read_size, loff_t *poffset) | |
1447 | { | |
1448 | int rc = -EACCES; | |
1449 | unsigned int bytes_read = 0; | |
1450 | unsigned int total_read = 0; | |
1451 | unsigned int current_read_size; | |
1452 | struct cifs_sb_info *cifs_sb; | |
1453 | struct cifsTconInfo *pTcon; | |
1454 | int xid; | |
1455 | struct cifsFileInfo *open_file; | |
1456 | char *smb_read_data; | |
1457 | char __user *current_offset; | |
1458 | struct smb_com_read_rsp *pSMBr; | |
1459 | ||
1460 | xid = GetXid(); | |
1461 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1462 | pTcon = cifs_sb->tcon; | |
1463 | ||
1464 | if (file->private_data == NULL) { | |
1465 | FreeXid(xid); | |
1466 | return -EBADF; | |
1467 | } | |
1468 | open_file = (struct cifsFileInfo *)file->private_data; | |
1469 | ||
1470 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1471 | cFYI(1, ("attempting read on write only file instance")); | |
1472 | } | |
1473 | for (total_read = 0, current_offset = read_data; | |
1474 | read_size > total_read; | |
1475 | total_read += bytes_read, current_offset += bytes_read) { | |
1476 | current_read_size = min_t(const int, read_size - total_read, | |
1477 | cifs_sb->rsize); | |
1478 | rc = -EAGAIN; | |
1479 | smb_read_data = NULL; | |
1480 | while (rc == -EAGAIN) { | |
ec637e3f | 1481 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1482 | if ((open_file->invalidHandle) && |
1483 | (!open_file->closePend)) { | |
1484 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1485 | file, TRUE); | |
1486 | if (rc != 0) | |
1487 | break; | |
1488 | } | |
bfa0d75a | 1489 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1490 | open_file->netfid, |
1491 | current_read_size, *poffset, | |
1492 | &bytes_read, &smb_read_data, | |
1493 | &buf_type); | |
1da177e4 | 1494 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1495 | if (smb_read_data) { |
93544cc6 SF |
1496 | if (copy_to_user(current_offset, |
1497 | smb_read_data + | |
1498 | 4 /* RFC1001 length field */ + | |
1499 | le16_to_cpu(pSMBr->DataOffset), | |
1500 | bytes_read)) { | |
1501 | rc = -EFAULT; | |
1502 | } | |
1503 | ||
ec637e3f SF |
1504 | if(buf_type == CIFS_SMALL_BUFFER) |
1505 | cifs_small_buf_release(smb_read_data); | |
1506 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1507 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1508 | smb_read_data = NULL; |
1509 | } | |
1510 | } | |
1511 | if (rc || (bytes_read == 0)) { | |
1512 | if (total_read) { | |
1513 | break; | |
1514 | } else { | |
1515 | FreeXid(xid); | |
1516 | return rc; | |
1517 | } | |
1518 | } else { | |
a4544347 | 1519 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1520 | *poffset += bytes_read; |
1521 | } | |
1522 | } | |
1523 | FreeXid(xid); | |
1524 | return total_read; | |
1525 | } | |
1526 | ||
1527 | ||
1528 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1529 | loff_t *poffset) | |
1530 | { | |
1531 | int rc = -EACCES; | |
1532 | unsigned int bytes_read = 0; | |
1533 | unsigned int total_read; | |
1534 | unsigned int current_read_size; | |
1535 | struct cifs_sb_info *cifs_sb; | |
1536 | struct cifsTconInfo *pTcon; | |
1537 | int xid; | |
1538 | char *current_offset; | |
1539 | struct cifsFileInfo *open_file; | |
ec637e3f | 1540 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1541 | |
1542 | xid = GetXid(); | |
1543 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1544 | pTcon = cifs_sb->tcon; | |
1545 | ||
1546 | if (file->private_data == NULL) { | |
1547 | FreeXid(xid); | |
1548 | return -EBADF; | |
1549 | } | |
1550 | open_file = (struct cifsFileInfo *)file->private_data; | |
1551 | ||
1552 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1553 | cFYI(1, ("attempting read on write only file instance")); | |
1554 | ||
1555 | for (total_read = 0, current_offset = read_data; | |
1556 | read_size > total_read; | |
1557 | total_read += bytes_read, current_offset += bytes_read) { | |
1558 | current_read_size = min_t(const int, read_size - total_read, | |
1559 | cifs_sb->rsize); | |
f9f5c817 SF |
1560 | /* For windows me and 9x we do not want to request more |
1561 | than it negotiated since it will refuse the read then */ | |
1562 | if((pTcon->ses) && | |
1563 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { | |
1564 | current_read_size = min_t(const int, current_read_size, | |
1565 | pTcon->ses->server->maxBuf - 128); | |
1566 | } | |
1da177e4 LT |
1567 | rc = -EAGAIN; |
1568 | while (rc == -EAGAIN) { | |
1569 | if ((open_file->invalidHandle) && | |
1570 | (!open_file->closePend)) { | |
1571 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1572 | file, TRUE); | |
1573 | if (rc != 0) | |
1574 | break; | |
1575 | } | |
bfa0d75a | 1576 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1577 | open_file->netfid, |
1578 | current_read_size, *poffset, | |
1579 | &bytes_read, ¤t_offset, | |
1580 | &buf_type); | |
1da177e4 LT |
1581 | } |
1582 | if (rc || (bytes_read == 0)) { | |
1583 | if (total_read) { | |
1584 | break; | |
1585 | } else { | |
1586 | FreeXid(xid); | |
1587 | return rc; | |
1588 | } | |
1589 | } else { | |
a4544347 | 1590 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1591 | *poffset += bytes_read; |
1592 | } | |
1593 | } | |
1594 | FreeXid(xid); | |
1595 | return total_read; | |
1596 | } | |
1597 | ||
1598 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1599 | { | |
1600 | struct dentry *dentry = file->f_dentry; | |
1601 | int rc, xid; | |
1602 | ||
1603 | xid = GetXid(); | |
1604 | rc = cifs_revalidate(dentry); | |
1605 | if (rc) { | |
1606 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1607 | FreeXid(xid); | |
1608 | return rc; | |
1609 | } | |
1610 | rc = generic_file_mmap(file, vma); | |
1611 | FreeXid(xid); | |
1612 | return rc; | |
1613 | } | |
1614 | ||
1615 | ||
1616 | static void cifs_copy_cache_pages(struct address_space *mapping, | |
1617 | struct list_head *pages, int bytes_read, char *data, | |
1618 | struct pagevec *plru_pvec) | |
1619 | { | |
1620 | struct page *page; | |
1621 | char *target; | |
1622 | ||
1623 | while (bytes_read > 0) { | |
1624 | if (list_empty(pages)) | |
1625 | break; | |
1626 | ||
1627 | page = list_entry(pages->prev, struct page, lru); | |
1628 | list_del(&page->lru); | |
1629 | ||
1630 | if (add_to_page_cache(page, mapping, page->index, | |
1631 | GFP_KERNEL)) { | |
1632 | page_cache_release(page); | |
1633 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1634 | data += PAGE_CACHE_SIZE; |
1635 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1636 | continue; |
1637 | } | |
1638 | ||
1639 | target = kmap_atomic(page,KM_USER0); | |
1640 | ||
1641 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1642 | memcpy(target, data, bytes_read); | |
1643 | /* zero the tail end of this partial page */ | |
1644 | memset(target + bytes_read, 0, | |
1645 | PAGE_CACHE_SIZE - bytes_read); | |
1646 | bytes_read = 0; | |
1647 | } else { | |
1648 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1649 | bytes_read -= PAGE_CACHE_SIZE; | |
1650 | } | |
1651 | kunmap_atomic(target, KM_USER0); | |
1652 | ||
1653 | flush_dcache_page(page); | |
1654 | SetPageUptodate(page); | |
1655 | unlock_page(page); | |
1656 | if (!pagevec_add(plru_pvec, page)) | |
1657 | __pagevec_lru_add(plru_pvec); | |
1658 | data += PAGE_CACHE_SIZE; | |
1659 | } | |
1660 | return; | |
1661 | } | |
1662 | ||
1663 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1664 | struct list_head *page_list, unsigned num_pages) | |
1665 | { | |
1666 | int rc = -EACCES; | |
1667 | int xid; | |
1668 | loff_t offset; | |
1669 | struct page *page; | |
1670 | struct cifs_sb_info *cifs_sb; | |
1671 | struct cifsTconInfo *pTcon; | |
1672 | int bytes_read = 0; | |
1673 | unsigned int read_size,i; | |
1674 | char *smb_read_data = NULL; | |
1675 | struct smb_com_read_rsp *pSMBr; | |
1676 | struct pagevec lru_pvec; | |
1677 | struct cifsFileInfo *open_file; | |
ec637e3f | 1678 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1679 | |
1680 | xid = GetXid(); | |
1681 | if (file->private_data == NULL) { | |
1682 | FreeXid(xid); | |
1683 | return -EBADF; | |
1684 | } | |
1685 | open_file = (struct cifsFileInfo *)file->private_data; | |
1686 | cifs_sb = CIFS_SB(file->f_dentry->d_sb); | |
1687 | pTcon = cifs_sb->tcon; | |
bfa0d75a | 1688 | |
1da177e4 LT |
1689 | pagevec_init(&lru_pvec, 0); |
1690 | ||
1691 | for (i = 0; i < num_pages; ) { | |
1692 | unsigned contig_pages; | |
1693 | struct page *tmp_page; | |
1694 | unsigned long expected_index; | |
1695 | ||
1696 | if (list_empty(page_list)) | |
1697 | break; | |
1698 | ||
1699 | page = list_entry(page_list->prev, struct page, lru); | |
1700 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1701 | ||
1702 | /* count adjacent pages that we will read into */ | |
1703 | contig_pages = 0; | |
1704 | expected_index = | |
1705 | list_entry(page_list->prev, struct page, lru)->index; | |
1706 | list_for_each_entry_reverse(tmp_page,page_list,lru) { | |
1707 | if (tmp_page->index == expected_index) { | |
1708 | contig_pages++; | |
1709 | expected_index++; | |
1710 | } else | |
1711 | break; | |
1712 | } | |
1713 | if (contig_pages + i > num_pages) | |
1714 | contig_pages = num_pages - i; | |
1715 | ||
1716 | /* for reads over a certain size could initiate async | |
1717 | read ahead */ | |
1718 | ||
1719 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1720 | /* Read size needs to be in multiples of one page */ | |
1721 | read_size = min_t(const unsigned int, read_size, | |
1722 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
1723 | ||
1724 | rc = -EAGAIN; | |
1725 | while (rc == -EAGAIN) { | |
1726 | if ((open_file->invalidHandle) && | |
1727 | (!open_file->closePend)) { | |
1728 | rc = cifs_reopen_file(file->f_dentry->d_inode, | |
1729 | file, TRUE); | |
1730 | if (rc != 0) | |
1731 | break; | |
1732 | } | |
1733 | ||
bfa0d75a | 1734 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1735 | open_file->netfid, |
1736 | read_size, offset, | |
1737 | &bytes_read, &smb_read_data, | |
1738 | &buf_type); | |
a9d02ad4 | 1739 | /* BB more RC checks ? */ |
1da177e4 LT |
1740 | if (rc== -EAGAIN) { |
1741 | if (smb_read_data) { | |
ec637e3f SF |
1742 | if(buf_type == CIFS_SMALL_BUFFER) |
1743 | cifs_small_buf_release(smb_read_data); | |
1744 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1745 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1746 | smb_read_data = NULL; |
1747 | } | |
1748 | } | |
1749 | } | |
1750 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1751 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1752 | /* clean up remaing pages off list */ | |
1753 | while (!list_empty(page_list) && (i < num_pages)) { | |
1754 | page = list_entry(page_list->prev, struct page, | |
1755 | lru); | |
1756 | list_del(&page->lru); | |
1757 | page_cache_release(page); | |
1758 | } | |
1759 | break; | |
1760 | } else if (bytes_read > 0) { | |
1761 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; | |
1762 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1763 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1764 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1765 | ||
1766 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1767 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1768 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1769 | i++; /* account for partial page */ | |
1770 | ||
1771 | /* server copy of file can have smaller size | |
1772 | than client */ | |
1773 | /* BB do we need to verify this common case ? | |
1774 | this case is ok - if we are at server EOF | |
1775 | we will hit it on next read */ | |
1776 | ||
1777 | /* while (!list_empty(page_list) && (i < num_pages)) { | |
1778 | page = list_entry(page_list->prev, | |
1779 | struct page, list); | |
1780 | list_del(&page->list); | |
1781 | page_cache_release(page); | |
1782 | } | |
1783 | break; */ | |
1784 | } | |
1785 | } else { | |
1786 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1787 | "Cleaning remaining pages from readahead list", | |
1788 | bytes_read, offset)); | |
1789 | /* BB turn off caching and do new lookup on | |
1790 | file size at server? */ | |
1791 | while (!list_empty(page_list) && (i < num_pages)) { | |
1792 | page = list_entry(page_list->prev, struct page, | |
1793 | lru); | |
1794 | list_del(&page->lru); | |
1795 | ||
1796 | /* BB removeme - replace with zero of page? */ | |
1797 | page_cache_release(page); | |
1798 | } | |
1799 | break; | |
1800 | } | |
1801 | if (smb_read_data) { | |
ec637e3f SF |
1802 | if(buf_type == CIFS_SMALL_BUFFER) |
1803 | cifs_small_buf_release(smb_read_data); | |
1804 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1805 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1806 | smb_read_data = NULL; |
1807 | } | |
1808 | bytes_read = 0; | |
1809 | } | |
1810 | ||
1811 | pagevec_lru_add(&lru_pvec); | |
1812 | ||
1813 | /* need to free smb_read_data buf before exit */ | |
1814 | if (smb_read_data) { | |
47c886b3 SF |
1815 | if(buf_type == CIFS_SMALL_BUFFER) |
1816 | cifs_small_buf_release(smb_read_data); | |
1817 | else if(buf_type == CIFS_LARGE_BUFFER) | |
1818 | cifs_buf_release(smb_read_data); | |
1da177e4 LT |
1819 | smb_read_data = NULL; |
1820 | } | |
1821 | ||
1822 | FreeXid(xid); | |
1823 | return rc; | |
1824 | } | |
1825 | ||
1826 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1827 | loff_t *poffset) | |
1828 | { | |
1829 | char *read_data; | |
1830 | int rc; | |
1831 | ||
1832 | page_cache_get(page); | |
1833 | read_data = kmap(page); | |
1834 | /* for reads over a certain size could initiate async read ahead */ | |
1835 | ||
1836 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); | |
1837 | ||
1838 | if (rc < 0) | |
1839 | goto io_error; | |
1840 | else | |
26a21b98 | 1841 | cFYI(1, ("Bytes read %d",rc)); |
1da177e4 LT |
1842 | |
1843 | file->f_dentry->d_inode->i_atime = | |
1844 | current_fs_time(file->f_dentry->d_inode->i_sb); | |
1845 | ||
1846 | if (PAGE_CACHE_SIZE > rc) | |
1847 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1848 | ||
1849 | flush_dcache_page(page); | |
1850 | SetPageUptodate(page); | |
1851 | rc = 0; | |
1852 | ||
1853 | io_error: | |
1854 | kunmap(page); | |
1855 | page_cache_release(page); | |
1856 | return rc; | |
1857 | } | |
1858 | ||
1859 | static int cifs_readpage(struct file *file, struct page *page) | |
1860 | { | |
1861 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1862 | int rc = -EACCES; | |
1863 | int xid; | |
1864 | ||
1865 | xid = GetXid(); | |
1866 | ||
1867 | if (file->private_data == NULL) { | |
1868 | FreeXid(xid); | |
1869 | return -EBADF; | |
1870 | } | |
1871 | ||
1872 | cFYI(1, ("readpage %p at offset %d 0x%x\n", | |
1873 | page, (int)offset, (int)offset)); | |
1874 | ||
1875 | rc = cifs_readpage_worker(file, page, &offset); | |
1876 | ||
1877 | unlock_page(page); | |
1878 | ||
1879 | FreeXid(xid); | |
1880 | return rc; | |
1881 | } | |
1882 | ||
1883 | /* We do not want to update the file size from server for inodes | |
1884 | open for write - to avoid races with writepage extending | |
1885 | the file - in the future we could consider allowing | |
1886 | refreshing the inode only on increases in the file size | |
1887 | but this is tricky to do without racing with writebehind | |
1888 | page caching in the current Linux kernel design */ | |
1889 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode) | |
1890 | { | |
23e7dd7d SF |
1891 | struct cifsFileInfo *open_file = NULL; |
1892 | ||
1893 | if (cifsInode) | |
1894 | open_file = find_writable_file(cifsInode); | |
1895 | ||
1896 | if(open_file) { | |
c32a0b68 SF |
1897 | struct cifs_sb_info *cifs_sb; |
1898 | ||
23e7dd7d SF |
1899 | /* there is not actually a write pending so let |
1900 | this handle go free and allow it to | |
1901 | be closable if needed */ | |
1902 | atomic_dec(&open_file->wrtPending); | |
c32a0b68 SF |
1903 | |
1904 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); | |
1905 | if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) { | |
1906 | /* since no page cache to corrupt on directio | |
1907 | we can change size safely */ | |
1908 | return 1; | |
1909 | } | |
1910 | ||
6148a742 | 1911 | return 0; |
23e7dd7d | 1912 | } else |
6148a742 | 1913 | return 1; |
1da177e4 LT |
1914 | } |
1915 | ||
1da177e4 LT |
1916 | static int cifs_prepare_write(struct file *file, struct page *page, |
1917 | unsigned from, unsigned to) | |
1918 | { | |
1919 | int rc = 0; | |
1920 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1921 | cFYI(1, ("prepare write for page %p from %d to %d",page,from,to)); | |
1922 | if (!PageUptodate(page)) { | |
1923 | /* if (to - from != PAGE_CACHE_SIZE) { | |
1924 | void *kaddr = kmap_atomic(page, KM_USER0); | |
1925 | memset(kaddr, 0, from); | |
1926 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); | |
1927 | flush_dcache_page(page); | |
1928 | kunmap_atomic(kaddr, KM_USER0); | |
1929 | } */ | |
1930 | /* If we are writing a full page it will be up to date, | |
1931 | no need to read from the server */ | |
1932 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) | |
1933 | SetPageUptodate(page); | |
1934 | ||
1935 | /* might as well read a page, it is fast enough */ | |
1936 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1937 | rc = cifs_readpage_worker(file, page, &offset); | |
1938 | } else { | |
1939 | /* should we try using another file handle if there is one - | |
1940 | how would we lock it to prevent close of that handle | |
1941 | racing with this read? | |
1942 | In any case this will be written out by commit_write */ | |
1943 | } | |
1944 | } | |
1945 | ||
1946 | /* BB should we pass any errors back? | |
1947 | e.g. if we do not have read access to the file */ | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | struct address_space_operations cifs_addr_ops = { | |
1952 | .readpage = cifs_readpage, | |
1953 | .readpages = cifs_readpages, | |
1954 | .writepage = cifs_writepage, | |
37c0eb46 | 1955 | .writepages = cifs_writepages, |
1da177e4 LT |
1956 | .prepare_write = cifs_prepare_write, |
1957 | .commit_write = cifs_commit_write, | |
1958 | .set_page_dirty = __set_page_dirty_nobuffers, | |
1959 | /* .sync_page = cifs_sync_page, */ | |
1960 | /* .direct_IO = */ | |
1961 | }; | |
273d81d6 DK |
1962 | |
1963 | /* | |
1964 | * cifs_readpages requires the server to support a buffer large enough to | |
1965 | * contain the header plus one complete page of data. Otherwise, we need | |
1966 | * to leave cifs_readpages out of the address space operations. | |
1967 | */ | |
1968 | struct address_space_operations cifs_addr_ops_smallbuf = { | |
1969 | .readpage = cifs_readpage, | |
1970 | .writepage = cifs_writepage, | |
1971 | .writepages = cifs_writepages, | |
1972 | .prepare_write = cifs_prepare_write, | |
1973 | .commit_write = cifs_commit_write, | |
1974 | .set_page_dirty = __set_page_dirty_nobuffers, | |
1975 | /* .sync_page = cifs_sync_page, */ | |
1976 | /* .direct_IO = */ | |
1977 | }; |