Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 SF |
5 | * |
6 | * Copyright (C) International Business Machines Corp., 2002,2007 | |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
1da177e4 LT |
33 | #include <asm/div64.h> |
34 | #include "cifsfs.h" | |
35 | #include "cifspdu.h" | |
36 | #include "cifsglob.h" | |
37 | #include "cifsproto.h" | |
38 | #include "cifs_unicode.h" | |
39 | #include "cifs_debug.h" | |
40 | #include "cifs_fs_sb.h" | |
41 | ||
42 | static inline struct cifsFileInfo *cifs_init_private( | |
43 | struct cifsFileInfo *private_data, struct inode *inode, | |
44 | struct file *file, __u16 netfid) | |
45 | { | |
46 | memset(private_data, 0, sizeof(struct cifsFileInfo)); | |
47 | private_data->netfid = netfid; | |
fb8c4b14 | 48 | private_data->pid = current->tgid; |
1da177e4 | 49 | init_MUTEX(&private_data->fh_sem); |
796e5661 | 50 | mutex_init(&private_data->lock_mutex); |
7ee1af76 | 51 | INIT_LIST_HEAD(&private_data->llist); |
1da177e4 LT |
52 | private_data->pfile = file; /* needed for writepage */ |
53 | private_data->pInode = inode; | |
54 | private_data->invalidHandle = FALSE; | |
55 | private_data->closePend = FALSE; | |
23e7dd7d SF |
56 | /* we have to track num writers to the inode, since writepages |
57 | does not tell us which handle the write is for so there can | |
58 | be a close (overlapping with write) of the filehandle that | |
59 | cifs_writepages chose to use */ | |
fb8c4b14 | 60 | atomic_set(&private_data->wrtPending, 0); |
1da177e4 LT |
61 | |
62 | return private_data; | |
63 | } | |
64 | ||
65 | static inline int cifs_convert_flags(unsigned int flags) | |
66 | { | |
67 | if ((flags & O_ACCMODE) == O_RDONLY) | |
68 | return GENERIC_READ; | |
69 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
70 | return GENERIC_WRITE; | |
71 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
72 | /* GENERIC_ALL is too much permission to request | |
73 | can cause unnecessary access denied on create */ | |
74 | /* return GENERIC_ALL; */ | |
75 | return (GENERIC_READ | GENERIC_WRITE); | |
76 | } | |
77 | ||
78 | return 0x20197; | |
79 | } | |
80 | ||
81 | static inline int cifs_get_disposition(unsigned int flags) | |
82 | { | |
83 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
84 | return FILE_CREATE; | |
85 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
86 | return FILE_OVERWRITE_IF; | |
87 | else if ((flags & O_CREAT) == O_CREAT) | |
88 | return FILE_OPEN_IF; | |
55aa2e09 SF |
89 | else if ((flags & O_TRUNC) == O_TRUNC) |
90 | return FILE_OVERWRITE; | |
1da177e4 LT |
91 | else |
92 | return FILE_OPEN; | |
93 | } | |
94 | ||
95 | /* all arguments to this function must be checked for validity in caller */ | |
96 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
97 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
98 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
99 | char *full_path, int xid) | |
100 | { | |
101 | struct timespec temp; | |
102 | int rc; | |
103 | ||
104 | /* want handles we can use to read with first | |
105 | in the list so we do not have to walk the | |
106 | list to search for one in prepare_write */ | |
107 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
fb8c4b14 | 108 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
109 | &pCifsInode->openFileList); |
110 | } else { | |
111 | list_add(&pCifsFile->flist, | |
112 | &pCifsInode->openFileList); | |
113 | } | |
114 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
115 | if (pCifsInode->clientCanCacheRead) { |
116 | /* we have the inode open somewhere else | |
117 | no need to discard cache data */ | |
118 | goto client_can_cache; | |
119 | } | |
120 | ||
121 | /* BB need same check in cifs_create too? */ | |
122 | /* if not oplocked, invalidate inode pages if mtime or file | |
123 | size changed */ | |
124 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
125 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
126 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
128 | cFYI(1, ("inode unchanged on server")); | |
129 | } else { | |
e6a00296 | 130 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
131 | /* BB no need to lock inode until after invalidate |
132 | since namei code should already have it locked? */ | |
e6a00296 | 133 | filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
1da177e4 LT |
134 | } |
135 | cFYI(1, ("invalidating remote inode since open detected it " | |
136 | "changed")); | |
e6a00296 | 137 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
138 | } |
139 | ||
140 | client_can_cache: | |
141 | if (pTcon->ses->capabilities & CAP_UNIX) | |
e6a00296 | 142 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
143 | full_path, inode->i_sb, xid); |
144 | else | |
e6a00296 | 145 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
1da177e4 LT |
146 | full_path, buf, inode->i_sb, xid); |
147 | ||
148 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
149 | pCifsInode->clientCanCacheAll = TRUE; | |
150 | pCifsInode->clientCanCacheRead = TRUE; | |
151 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
e6a00296 | 152 | file->f_path.dentry->d_inode)); |
1da177e4 LT |
153 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
154 | pCifsInode->clientCanCacheRead = TRUE; | |
155 | ||
156 | return rc; | |
157 | } | |
158 | ||
159 | int cifs_open(struct inode *inode, struct file *file) | |
160 | { | |
161 | int rc = -EACCES; | |
162 | int xid, oplock; | |
163 | struct cifs_sb_info *cifs_sb; | |
164 | struct cifsTconInfo *pTcon; | |
165 | struct cifsFileInfo *pCifsFile; | |
166 | struct cifsInodeInfo *pCifsInode; | |
167 | struct list_head *tmp; | |
168 | char *full_path = NULL; | |
169 | int desiredAccess; | |
170 | int disposition; | |
171 | __u16 netfid; | |
172 | FILE_ALL_INFO *buf = NULL; | |
173 | ||
174 | xid = GetXid(); | |
175 | ||
176 | cifs_sb = CIFS_SB(inode->i_sb); | |
177 | pTcon = cifs_sb->tcon; | |
178 | ||
179 | if (file->f_flags & O_CREAT) { | |
180 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 181 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
182 | read_lock(&GlobalSMBSeslock); |
183 | list_for_each(tmp, &pCifsInode->openFileList) { | |
184 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
185 | flist); | |
186 | if ((pCifsFile->pfile == NULL) && | |
187 | (pCifsFile->pid == current->tgid)) { | |
188 | /* mode set in cifs_create */ | |
189 | ||
190 | /* needed for writepage */ | |
191 | pCifsFile->pfile = file; | |
50c2f753 | 192 | |
1da177e4 LT |
193 | file->private_data = pCifsFile; |
194 | break; | |
195 | } | |
196 | } | |
197 | read_unlock(&GlobalSMBSeslock); | |
198 | if (file->private_data != NULL) { | |
199 | rc = 0; | |
200 | FreeXid(xid); | |
201 | return rc; | |
202 | } else { | |
203 | if (file->f_flags & O_EXCL) | |
204 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 205 | "new file %p", file)); |
1da177e4 LT |
206 | } |
207 | } | |
208 | ||
e6a00296 | 209 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
210 | if (full_path == NULL) { |
211 | FreeXid(xid); | |
212 | return -ENOMEM; | |
213 | } | |
214 | ||
7521a3c5 | 215 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 LT |
216 | inode, file->f_flags, full_path)); |
217 | desiredAccess = cifs_convert_flags(file->f_flags); | |
218 | ||
219 | /********************************************************************* | |
220 | * open flag mapping table: | |
fb8c4b14 | 221 | * |
1da177e4 | 222 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 223 | * ---------- ---------------- |
1da177e4 LT |
224 | * O_CREAT FILE_OPEN_IF |
225 | * O_CREAT | O_EXCL FILE_CREATE | |
226 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
227 | * O_TRUNC FILE_OVERWRITE | |
228 | * none of the above FILE_OPEN | |
229 | * | |
230 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 231 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
232 | * O_CREAT | O_TRUNC is similar but truncates the existing |
233 | * file rather than creating a new file as FILE_SUPERSEDE does | |
234 | * (which uses the attributes / metadata passed in on open call) | |
235 | *? | |
fb8c4b14 | 236 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
237 | *? and the read write flags match reasonably. O_LARGEFILE |
238 | *? is irrelevant because largefile support is always used | |
239 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
240 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
241 | *********************************************************************/ | |
242 | ||
243 | disposition = cifs_get_disposition(file->f_flags); | |
244 | ||
245 | if (oplockEnabled) | |
246 | oplock = REQ_OPLOCK; | |
247 | else | |
248 | oplock = FALSE; | |
249 | ||
250 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
251 | ||
252 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
253 | and calling get_inode_info with returned buf (at least helps | |
254 | non-Unix server case) */ | |
255 | ||
fb8c4b14 SF |
256 | /* BB we can not do this if this is the second open of a file |
257 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
258 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
259 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
260 | if (!buf) { | |
261 | rc = -ENOMEM; | |
262 | goto out; | |
263 | } | |
5bafd765 SF |
264 | |
265 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
fb8c4b14 | 266 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, |
5bafd765 | 267 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
268 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
269 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
270 | else |
271 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
272 | ||
a9d02ad4 SF |
273 | if (rc == -EIO) { |
274 | /* Old server, try legacy style OpenX */ | |
275 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
276 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
277 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
278 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
279 | } | |
1da177e4 | 280 | if (rc) { |
26a21b98 | 281 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
282 | goto out; |
283 | } | |
284 | file->private_data = | |
285 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
286 | if (file->private_data == NULL) { | |
287 | rc = -ENOMEM; | |
288 | goto out; | |
289 | } | |
290 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 LT |
291 | write_lock(&GlobalSMBSeslock); |
292 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
293 | ||
e6a00296 | 294 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
295 | if (pCifsInode) { |
296 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
297 | pCifsFile, pTcon, | |
298 | &oplock, buf, full_path, xid); | |
299 | } else { | |
300 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
301 | } |
302 | ||
fb8c4b14 | 303 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
304 | /* time to set mode which we can not set earlier due to |
305 | problems creating new read-only files */ | |
306 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) { | |
307 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, | |
308 | inode->i_mode, | |
309 | (__u64)-1, (__u64)-1, 0 /* dev */, | |
737b758c | 310 | cifs_sb->local_nls, |
fb8c4b14 | 311 | cifs_sb->mnt_cifs_flags & |
737b758c | 312 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
313 | } else { |
314 | /* BB implement via Windows security descriptors eg | |
315 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, | |
316 | -1, -1, local_nls); | |
317 | in the meantime could set r/o dos attribute when | |
318 | perms are eg: mode & 0222 == 0 */ | |
319 | } | |
320 | } | |
321 | ||
322 | out: | |
323 | kfree(buf); | |
324 | kfree(full_path); | |
325 | FreeXid(xid); | |
326 | return rc; | |
327 | } | |
328 | ||
0418726b | 329 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
330 | /* to server was lost */ |
331 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
332 | { | |
333 | int rc = 0; | |
334 | ||
335 | /* BB list all locks open on this file and relock */ | |
336 | ||
337 | return rc; | |
338 | } | |
339 | ||
3a9f462f | 340 | static int cifs_reopen_file(struct file *file, int can_flush) |
1da177e4 LT |
341 | { |
342 | int rc = -EACCES; | |
343 | int xid, oplock; | |
344 | struct cifs_sb_info *cifs_sb; | |
345 | struct cifsTconInfo *pTcon; | |
346 | struct cifsFileInfo *pCifsFile; | |
347 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 348 | struct inode *inode; |
1da177e4 LT |
349 | char *full_path = NULL; |
350 | int desiredAccess; | |
351 | int disposition = FILE_OPEN; | |
352 | __u16 netfid; | |
353 | ||
1da177e4 LT |
354 | if (file->private_data) { |
355 | pCifsFile = (struct cifsFileInfo *)file->private_data; | |
356 | } else | |
357 | return -EBADF; | |
358 | ||
359 | xid = GetXid(); | |
360 | down(&pCifsFile->fh_sem); | |
361 | if (pCifsFile->invalidHandle == FALSE) { | |
362 | up(&pCifsFile->fh_sem); | |
363 | FreeXid(xid); | |
364 | return 0; | |
365 | } | |
366 | ||
e6a00296 | 367 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
368 | cERROR(1, ("no valid name if dentry freed")); |
369 | dump_stack(); | |
370 | rc = -EBADF; | |
371 | goto reopen_error_exit; | |
372 | } | |
373 | ||
374 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 375 | if (inode == NULL) { |
3a9f462f SF |
376 | cERROR(1, ("inode not valid")); |
377 | dump_stack(); | |
378 | rc = -EBADF; | |
379 | goto reopen_error_exit; | |
1da177e4 | 380 | } |
50c2f753 | 381 | |
1da177e4 LT |
382 | cifs_sb = CIFS_SB(inode->i_sb); |
383 | pTcon = cifs_sb->tcon; | |
3a9f462f | 384 | |
1da177e4 LT |
385 | /* can not grab rename sem here because various ops, including |
386 | those that already have the rename sem can end up causing writepage | |
387 | to get called and if the server was down that means we end up here, | |
388 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 389 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 390 | if (full_path == NULL) { |
3a9f462f SF |
391 | rc = -ENOMEM; |
392 | reopen_error_exit: | |
1da177e4 LT |
393 | up(&pCifsFile->fh_sem); |
394 | FreeXid(xid); | |
3a9f462f | 395 | return rc; |
1da177e4 LT |
396 | } |
397 | ||
3a9f462f | 398 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 399 | inode, file->f_flags, full_path)); |
1da177e4 LT |
400 | desiredAccess = cifs_convert_flags(file->f_flags); |
401 | ||
402 | if (oplockEnabled) | |
403 | oplock = REQ_OPLOCK; | |
404 | else | |
405 | oplock = FALSE; | |
406 | ||
407 | /* Can not refresh inode by passing in file_info buf to be returned | |
fb8c4b14 SF |
408 | by SMBOpen and then calling get_inode_info with returned buf |
409 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
410 | and server version of file size can be stale. If we knew for sure |
411 | that inode was not dirty locally we could do this */ | |
412 | ||
1da177e4 LT |
413 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, |
414 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
fb8c4b14 | 415 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 416 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
417 | if (rc) { |
418 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
419 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
420 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 LT |
421 | } else { |
422 | pCifsFile->netfid = netfid; | |
423 | pCifsFile->invalidHandle = FALSE; | |
424 | up(&pCifsFile->fh_sem); | |
425 | pCifsInode = CIFS_I(inode); | |
426 | if (pCifsInode) { | |
427 | if (can_flush) { | |
28fd1298 | 428 | filemap_write_and_wait(inode->i_mapping); |
1da177e4 LT |
429 | /* temporarily disable caching while we |
430 | go to server to get inode info */ | |
431 | pCifsInode->clientCanCacheAll = FALSE; | |
432 | pCifsInode->clientCanCacheRead = FALSE; | |
433 | if (pTcon->ses->capabilities & CAP_UNIX) | |
434 | rc = cifs_get_inode_info_unix(&inode, | |
435 | full_path, inode->i_sb, xid); | |
436 | else | |
437 | rc = cifs_get_inode_info(&inode, | |
438 | full_path, NULL, inode->i_sb, | |
439 | xid); | |
440 | } /* else we are writing out data to server already | |
441 | and could deadlock if we tried to flush data, and | |
442 | since we do not know if we have data that would | |
443 | invalidate the current end of file on the server | |
444 | we can not go to the server to get the new inod | |
445 | info */ | |
446 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
447 | pCifsInode->clientCanCacheAll = TRUE; | |
448 | pCifsInode->clientCanCacheRead = TRUE; | |
449 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
e6a00296 | 450 | file->f_path.dentry->d_inode)); |
1da177e4 LT |
451 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
452 | pCifsInode->clientCanCacheRead = TRUE; | |
453 | pCifsInode->clientCanCacheAll = FALSE; | |
454 | } else { | |
455 | pCifsInode->clientCanCacheRead = FALSE; | |
456 | pCifsInode->clientCanCacheAll = FALSE; | |
457 | } | |
458 | cifs_relock_file(pCifsFile); | |
459 | } | |
460 | } | |
461 | ||
462 | kfree(full_path); | |
463 | FreeXid(xid); | |
464 | return rc; | |
465 | } | |
466 | ||
467 | int cifs_close(struct inode *inode, struct file *file) | |
468 | { | |
469 | int rc = 0; | |
470 | int xid; | |
471 | struct cifs_sb_info *cifs_sb; | |
472 | struct cifsTconInfo *pTcon; | |
473 | struct cifsFileInfo *pSMBFile = | |
474 | (struct cifsFileInfo *)file->private_data; | |
475 | ||
476 | xid = GetXid(); | |
477 | ||
478 | cifs_sb = CIFS_SB(inode->i_sb); | |
479 | pTcon = cifs_sb->tcon; | |
480 | if (pSMBFile) { | |
7ee1af76 JA |
481 | struct cifsLockInfo *li, *tmp; |
482 | ||
1da177e4 | 483 | pSMBFile->closePend = TRUE; |
1da177e4 LT |
484 | if (pTcon) { |
485 | /* no sense reconnecting to close a file that is | |
486 | already closed */ | |
487 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
23e7dd7d | 488 | int timeout = 2; |
fb8c4b14 | 489 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
23e7dd7d SF |
490 | && (timeout < 1000) ) { |
491 | /* Give write a better chance to get to | |
492 | server ahead of the close. We do not | |
493 | want to add a wait_q here as it would | |
494 | increase the memory utilization as | |
495 | the struct would be in each open file, | |
fb8c4b14 | 496 | but this should give enough time to |
23e7dd7d | 497 | clear the socket */ |
4891d539 | 498 | #ifdef CONFIG_CIFS_DEBUG2 |
fb8c4b14 | 499 | cFYI(1, ("close delay, write pending")); |
4891d539 | 500 | #endif /* DEBUG2 */ |
23e7dd7d SF |
501 | msleep(timeout); |
502 | timeout *= 4; | |
4891d539 | 503 | } |
fb8c4b14 | 504 | if (atomic_read(&pSMBFile->wrtPending)) |
f7b2e8c7 | 505 | cERROR(1,("close with pending writes")); |
1da177e4 LT |
506 | rc = CIFSSMBClose(xid, pTcon, |
507 | pSMBFile->netfid); | |
1da177e4 LT |
508 | } |
509 | } | |
7ee1af76 JA |
510 | |
511 | /* Delete any outstanding lock records. | |
512 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 513 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
514 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
515 | list_del(&li->llist); | |
516 | kfree(li); | |
517 | } | |
796e5661 | 518 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 519 | |
cbe0476f | 520 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
521 | list_del(&pSMBFile->flist); |
522 | list_del(&pSMBFile->tlist); | |
cbe0476f | 523 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
524 | kfree(pSMBFile->search_resume_name); |
525 | kfree(file->private_data); | |
526 | file->private_data = NULL; | |
527 | } else | |
528 | rc = -EBADF; | |
529 | ||
530 | if (list_empty(&(CIFS_I(inode)->openFileList))) { | |
531 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
532 | /* if the file is not open we do not know if we can cache info | |
533 | on this inode, much less write behind and read ahead */ | |
534 | CIFS_I(inode)->clientCanCacheRead = FALSE; | |
535 | CIFS_I(inode)->clientCanCacheAll = FALSE; | |
536 | } | |
fb8c4b14 | 537 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
538 | rc = CIFS_I(inode)->write_behind_rc; |
539 | FreeXid(xid); | |
540 | return rc; | |
541 | } | |
542 | ||
543 | int cifs_closedir(struct inode *inode, struct file *file) | |
544 | { | |
545 | int rc = 0; | |
546 | int xid; | |
547 | struct cifsFileInfo *pCFileStruct = | |
548 | (struct cifsFileInfo *)file->private_data; | |
549 | char *ptmp; | |
550 | ||
26a21b98 | 551 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
552 | |
553 | xid = GetXid(); | |
554 | ||
555 | if (pCFileStruct) { | |
556 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
557 | struct cifs_sb_info *cifs_sb = |
558 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
559 | |
560 | pTcon = cifs_sb->tcon; | |
561 | ||
562 | cFYI(1, ("Freeing private data in close dir")); | |
31ca3bc3 SF |
563 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
564 | (pCFileStruct->invalidHandle == FALSE)) { | |
1da177e4 LT |
565 | pCFileStruct->invalidHandle = TRUE; |
566 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
567 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
568 | rc)); | |
569 | /* not much we can do if it fails anyway, ignore rc */ | |
570 | rc = 0; | |
571 | } | |
572 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
573 | if (ptmp) { | |
ec637e3f | 574 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 575 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 576 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
577 | cifs_small_buf_release(ptmp); |
578 | else | |
579 | cifs_buf_release(ptmp); | |
1da177e4 LT |
580 | } |
581 | ptmp = pCFileStruct->search_resume_name; | |
582 | if (ptmp) { | |
ec637e3f | 583 | cFYI(1, ("closedir free resume name")); |
1da177e4 LT |
584 | pCFileStruct->search_resume_name = NULL; |
585 | kfree(ptmp); | |
586 | } | |
587 | kfree(file->private_data); | |
588 | file->private_data = NULL; | |
589 | } | |
590 | /* BB can we lock the filestruct while this is going on? */ | |
591 | FreeXid(xid); | |
592 | return rc; | |
593 | } | |
594 | ||
7ee1af76 JA |
595 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
596 | __u64 offset, __u8 lockType) | |
597 | { | |
fb8c4b14 SF |
598 | struct cifsLockInfo *li = |
599 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
600 | if (li == NULL) |
601 | return -ENOMEM; | |
602 | li->offset = offset; | |
603 | li->length = len; | |
604 | li->type = lockType; | |
796e5661 | 605 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 606 | list_add(&li->llist, &fid->llist); |
796e5661 | 607 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
608 | return 0; |
609 | } | |
610 | ||
1da177e4 LT |
611 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
612 | { | |
613 | int rc, xid; | |
1da177e4 LT |
614 | __u32 numLock = 0; |
615 | __u32 numUnlock = 0; | |
616 | __u64 length; | |
617 | int wait_flag = FALSE; | |
618 | struct cifs_sb_info *cifs_sb; | |
619 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
620 | __u16 netfid; |
621 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
7ee1af76 | 622 | int posix_locking; |
1da177e4 LT |
623 | |
624 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
625 | rc = -EACCES; | |
626 | xid = GetXid(); | |
627 | ||
628 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
629 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
630 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
631 | pfLock->fl_end)); | |
1da177e4 LT |
632 | |
633 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 634 | cFYI(1, ("Posix")); |
1da177e4 | 635 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 636 | cFYI(1, ("Flock")); |
1da177e4 | 637 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 638 | cFYI(1, ("Blocking lock")); |
1da177e4 LT |
639 | wait_flag = TRUE; |
640 | } | |
641 | if (pfLock->fl_flags & FL_ACCESS) | |
642 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 643 | "not implemented yet")); |
1da177e4 LT |
644 | if (pfLock->fl_flags & FL_LEASE) |
645 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 646 | if (pfLock->fl_flags & |
1da177e4 LT |
647 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
648 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
649 | ||
650 | if (pfLock->fl_type == F_WRLCK) { | |
651 | cFYI(1, ("F_WRLCK ")); | |
652 | numLock = 1; | |
653 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 654 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 655 | numUnlock = 1; |
d47d7c1a SF |
656 | /* Check if unlock includes more than |
657 | one lock range */ | |
1da177e4 | 658 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 659 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
660 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
661 | numLock = 1; | |
662 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 663 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
664 | numLock = 1; |
665 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 666 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
667 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
668 | numLock = 1; | |
669 | } else | |
d47d7c1a | 670 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 671 | |
e6a00296 | 672 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
673 | pTcon = cifs_sb->tcon; |
674 | ||
675 | if (file->private_data == NULL) { | |
676 | FreeXid(xid); | |
677 | return -EBADF; | |
678 | } | |
08547b03 SF |
679 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
680 | ||
7ee1af76 JA |
681 | posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
682 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability)); | |
1da177e4 | 683 | |
08547b03 SF |
684 | /* BB add code here to normalize offset and length to |
685 | account for negative length which we can not accept over the | |
686 | wire */ | |
1da177e4 | 687 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 688 | if (posix_locking) { |
08547b03 | 689 | int posix_lock_type; |
fb8c4b14 | 690 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
691 | posix_lock_type = CIFS_RDLCK; |
692 | else | |
693 | posix_lock_type = CIFS_WRLCK; | |
694 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, | |
fc94cdb9 | 695 | length, pfLock, |
08547b03 SF |
696 | posix_lock_type, wait_flag); |
697 | FreeXid(xid); | |
698 | return rc; | |
699 | } | |
700 | ||
701 | /* BB we could chain these into one lock request BB */ | |
702 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
703 | 0, 1, lockType, 0 /* wait flag */ ); | |
1da177e4 | 704 | if (rc == 0) { |
fb8c4b14 | 705 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
1da177e4 LT |
706 | pfLock->fl_start, 1 /* numUnlock */ , |
707 | 0 /* numLock */ , lockType, | |
708 | 0 /* wait flag */ ); | |
709 | pfLock->fl_type = F_UNLCK; | |
710 | if (rc != 0) | |
711 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 712 | "range %d during test of lock", rc)); |
1da177e4 LT |
713 | rc = 0; |
714 | ||
715 | } else { | |
716 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
717 | rc = 0; /* do not change lock type to unlock | |
718 | since range in use */ | |
719 | } | |
720 | ||
721 | FreeXid(xid); | |
722 | return rc; | |
723 | } | |
7ee1af76 JA |
724 | |
725 | if (!numLock && !numUnlock) { | |
726 | /* if no lock or unlock then nothing | |
727 | to do since we do not know what it is */ | |
728 | FreeXid(xid); | |
729 | return -EOPNOTSUPP; | |
730 | } | |
731 | ||
732 | if (posix_locking) { | |
08547b03 | 733 | int posix_lock_type; |
fb8c4b14 | 734 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
735 | posix_lock_type = CIFS_RDLCK; |
736 | else | |
737 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 738 | |
fb8c4b14 | 739 | if (numUnlock == 1) |
beb84dc8 | 740 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 741 | |
08547b03 | 742 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, |
fc94cdb9 | 743 | length, pfLock, |
08547b03 | 744 | posix_lock_type, wait_flag); |
7ee1af76 | 745 | } else { |
fb8c4b14 SF |
746 | struct cifsFileInfo *fid = |
747 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
748 | |
749 | if (numLock) { | |
fb8c4b14 SF |
750 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
751 | pfLock->fl_start, | |
7ee1af76 JA |
752 | 0, numLock, lockType, wait_flag); |
753 | ||
754 | if (rc == 0) { | |
755 | /* For Windows locks we must store them. */ | |
756 | rc = store_file_lock(fid, length, | |
757 | pfLock->fl_start, lockType); | |
758 | } | |
759 | } else if (numUnlock) { | |
760 | /* For each stored lock that this unlock overlaps | |
761 | completely, unlock it. */ | |
762 | int stored_rc = 0; | |
763 | struct cifsLockInfo *li, *tmp; | |
764 | ||
6b70c955 | 765 | rc = 0; |
796e5661 | 766 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
767 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
768 | if (pfLock->fl_start <= li->offset && | |
769 | length >= li->length) { | |
fb8c4b14 SF |
770 | stored_rc = CIFSSMBLock(xid, pTcon, |
771 | netfid, | |
7ee1af76 JA |
772 | li->length, li->offset, |
773 | 1, 0, li->type, FALSE); | |
774 | if (stored_rc) | |
775 | rc = stored_rc; | |
776 | ||
777 | list_del(&li->llist); | |
778 | kfree(li); | |
779 | } | |
780 | } | |
796e5661 | 781 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
782 | } |
783 | } | |
784 | ||
d634cc15 | 785 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
786 | posix_lock_file_wait(file, pfLock); |
787 | FreeXid(xid); | |
788 | return rc; | |
789 | } | |
790 | ||
791 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
792 | size_t write_size, loff_t *poffset) | |
793 | { | |
794 | int rc = 0; | |
795 | unsigned int bytes_written = 0; | |
796 | unsigned int total_written; | |
797 | struct cifs_sb_info *cifs_sb; | |
798 | struct cifsTconInfo *pTcon; | |
799 | int xid, long_op; | |
800 | struct cifsFileInfo *open_file; | |
801 | ||
e6a00296 | 802 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
803 | |
804 | pTcon = cifs_sb->tcon; | |
805 | ||
806 | /* cFYI(1, | |
807 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 808 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
809 | |
810 | if (file->private_data == NULL) | |
811 | return -EBADF; | |
c33f8d32 | 812 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 813 | |
1da177e4 | 814 | xid = GetXid(); |
1da177e4 | 815 | |
e6a00296 | 816 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
817 | long_op = 2; /* writes past end of file can take a long time */ |
818 | else | |
819 | long_op = 1; | |
820 | ||
821 | for (total_written = 0; write_size > total_written; | |
822 | total_written += bytes_written) { | |
823 | rc = -EAGAIN; | |
824 | while (rc == -EAGAIN) { | |
825 | if (file->private_data == NULL) { | |
826 | /* file has been closed on us */ | |
827 | FreeXid(xid); | |
828 | /* if we have gotten here we have written some data | |
829 | and blocked, and the file has been freed on us while | |
830 | we blocked so return what we managed to write */ | |
831 | return total_written; | |
fb8c4b14 | 832 | } |
1da177e4 LT |
833 | if (open_file->closePend) { |
834 | FreeXid(xid); | |
835 | if (total_written) | |
836 | return total_written; | |
837 | else | |
838 | return -EBADF; | |
839 | } | |
840 | if (open_file->invalidHandle) { | |
1da177e4 LT |
841 | /* we could deadlock if we called |
842 | filemap_fdatawait from here so tell | |
843 | reopen_file not to flush data to server | |
844 | now */ | |
3a9f462f | 845 | rc = cifs_reopen_file(file, FALSE); |
1da177e4 LT |
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 | NULL, write_data + total_written, 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 | ||
a4544347 | 870 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
871 | |
872 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
873 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
874 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
875 | /* Do not update local mtime - server will set its actual value on write |
876 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
877 | * current_fs_time(inode->i_sb);*/ |
878 | if (total_written > 0) { | |
879 | spin_lock(&inode->i_lock); | |
880 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
881 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 882 | *poffset); |
3677db10 | 883 | spin_unlock(&inode->i_lock); |
1da177e4 | 884 | } |
fb8c4b14 | 885 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
886 | } |
887 | FreeXid(xid); | |
888 | return total_written; | |
889 | } | |
890 | ||
891 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
892 | size_t write_size, loff_t *poffset) | |
893 | { | |
894 | int rc = 0; | |
895 | unsigned int bytes_written = 0; | |
896 | unsigned int total_written; | |
897 | struct cifs_sb_info *cifs_sb; | |
898 | struct cifsTconInfo *pTcon; | |
899 | int xid, long_op; | |
900 | struct cifsFileInfo *open_file; | |
901 | ||
e6a00296 | 902 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
903 | |
904 | pTcon = cifs_sb->tcon; | |
905 | ||
fb8c4b14 | 906 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 907 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
908 | |
909 | if (file->private_data == NULL) | |
910 | return -EBADF; | |
c33f8d32 | 911 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 912 | |
1da177e4 | 913 | xid = GetXid(); |
1da177e4 | 914 | |
e6a00296 | 915 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
916 | long_op = 2; /* writes past end of file can take a long time */ |
917 | else | |
918 | long_op = 1; | |
919 | ||
920 | for (total_written = 0; write_size > total_written; | |
921 | total_written += bytes_written) { | |
922 | rc = -EAGAIN; | |
923 | while (rc == -EAGAIN) { | |
924 | if (file->private_data == NULL) { | |
925 | /* file has been closed on us */ | |
926 | FreeXid(xid); | |
927 | /* if we have gotten here we have written some data | |
928 | and blocked, and the file has been freed on us | |
fb8c4b14 | 929 | while we blocked so return what we managed to |
1da177e4 LT |
930 | write */ |
931 | return total_written; | |
fb8c4b14 | 932 | } |
1da177e4 LT |
933 | if (open_file->closePend) { |
934 | FreeXid(xid); | |
935 | if (total_written) | |
936 | return total_written; | |
937 | else | |
938 | return -EBADF; | |
939 | } | |
940 | if (open_file->invalidHandle) { | |
1da177e4 LT |
941 | /* we could deadlock if we called |
942 | filemap_fdatawait from here so tell | |
fb8c4b14 | 943 | reopen_file not to flush data to |
1da177e4 | 944 | server now */ |
3a9f462f | 945 | rc = cifs_reopen_file(file, FALSE); |
1da177e4 LT |
946 | if (rc != 0) |
947 | break; | |
948 | } | |
fb8c4b14 SF |
949 | if (experimEnabled || (pTcon->ses->server && |
950 | ((pTcon->ses->server->secMode & | |
08775834 | 951 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 952 | == 0))) { |
3e84469d SF |
953 | struct kvec iov[2]; |
954 | unsigned int len; | |
955 | ||
0ae0efad | 956 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
957 | write_size - total_written); |
958 | /* iov[0] is reserved for smb header */ | |
959 | iov[1].iov_base = (char *)write_data + | |
960 | total_written; | |
961 | iov[1].iov_len = len; | |
d6e04ae6 | 962 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 963 | open_file->netfid, len, |
d6e04ae6 | 964 | *poffset, &bytes_written, |
3e84469d | 965 | iov, 1, long_op); |
d6e04ae6 | 966 | } else |
60808233 SF |
967 | rc = CIFSSMBWrite(xid, pTcon, |
968 | open_file->netfid, | |
969 | min_t(const int, cifs_sb->wsize, | |
970 | write_size - total_written), | |
971 | *poffset, &bytes_written, | |
972 | write_data + total_written, | |
973 | NULL, long_op); | |
1da177e4 LT |
974 | } |
975 | if (rc || (bytes_written == 0)) { | |
976 | if (total_written) | |
977 | break; | |
978 | else { | |
979 | FreeXid(xid); | |
980 | return rc; | |
981 | } | |
982 | } else | |
983 | *poffset += bytes_written; | |
fb8c4b14 | 984 | long_op = FALSE; /* subsequent writes fast - |
1da177e4 LT |
985 | 15 seconds is plenty */ |
986 | } | |
987 | ||
a4544347 | 988 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
989 | |
990 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 991 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 992 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
993 | /* file->f_path.dentry->d_inode->i_ctime = |
994 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
995 | if (total_written > 0) { | |
996 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
997 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
998 | i_size_write(file->f_path.dentry->d_inode, | |
999 | *poffset); | |
1000 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1001 | } |
3677db10 | 1002 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1003 | } |
1004 | FreeXid(xid); | |
1005 | return total_written; | |
1006 | } | |
1007 | ||
dd99cd80 | 1008 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1009 | { |
1010 | struct cifsFileInfo *open_file; | |
dd99cd80 | 1011 | int rc; |
6148a742 | 1012 | |
60808233 SF |
1013 | /* Having a null inode here (because mapping->host was set to zero by |
1014 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1015 | it being zero) during stress testcases so we need to check for it */ | |
1016 | ||
fb8c4b14 SF |
1017 | if (cifs_inode == NULL) { |
1018 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1019 | dump_stack(); |
1020 | return NULL; | |
1021 | } | |
1022 | ||
6148a742 SF |
1023 | read_lock(&GlobalSMBSeslock); |
1024 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1025 | if (open_file->closePend) | |
1026 | continue; | |
1027 | if (open_file->pfile && | |
1028 | ((open_file->pfile->f_flags & O_RDWR) || | |
1029 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1030 | atomic_inc(&open_file->wrtPending); |
6148a742 | 1031 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 1032 | if ((open_file->invalidHandle) && |
23e7dd7d | 1033 | (!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) { |
3a9f462f | 1034 | rc = cifs_reopen_file(open_file->pfile, FALSE); |
37c0eb46 SF |
1035 | /* if it fails, try another handle - might be */ |
1036 | /* dangerous to hold up writepages with retry */ | |
fb8c4b14 | 1037 | if (rc) { |
50c2f753 SF |
1038 | cFYI(1, |
1039 | ("failed on reopen file in wp")); | |
37c0eb46 | 1040 | read_lock(&GlobalSMBSeslock); |
23e7dd7d SF |
1041 | /* can not use this handle, no write |
1042 | pending on this one after all */ | |
1043 | atomic_dec | |
1044 | (&open_file->wrtPending); | |
37c0eb46 SF |
1045 | continue; |
1046 | } | |
1047 | } | |
6148a742 SF |
1048 | return open_file; |
1049 | } | |
1050 | } | |
1051 | read_unlock(&GlobalSMBSeslock); | |
1052 | return NULL; | |
1053 | } | |
1054 | ||
1da177e4 LT |
1055 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1056 | { | |
1057 | struct address_space *mapping = page->mapping; | |
1058 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1059 | char *write_data; | |
1060 | int rc = -EFAULT; | |
1061 | int bytes_written = 0; | |
1062 | struct cifs_sb_info *cifs_sb; | |
1063 | struct cifsTconInfo *pTcon; | |
1064 | struct inode *inode; | |
6148a742 | 1065 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1066 | |
1067 | if (!mapping || !mapping->host) | |
1068 | return -EFAULT; | |
1069 | ||
1070 | inode = page->mapping->host; | |
1071 | cifs_sb = CIFS_SB(inode->i_sb); | |
1072 | pTcon = cifs_sb->tcon; | |
1073 | ||
1074 | offset += (loff_t)from; | |
1075 | write_data = kmap(page); | |
1076 | write_data += from; | |
1077 | ||
1078 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1079 | kunmap(page); | |
1080 | return -EIO; | |
1081 | } | |
1082 | ||
1083 | /* racing with truncate? */ | |
1084 | if (offset > mapping->host->i_size) { | |
1085 | kunmap(page); | |
1086 | return 0; /* don't care */ | |
1087 | } | |
1088 | ||
1089 | /* check to make sure that we are not extending the file */ | |
1090 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1091 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1092 | |
6148a742 SF |
1093 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1094 | if (open_file) { | |
1095 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1096 | to-from, &offset); | |
23e7dd7d | 1097 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1098 | /* Does mm or vfs already set times? */ |
6148a742 SF |
1099 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
1100 | if ((bytes_written > 0) && (offset)) { | |
1101 | rc = 0; | |
1102 | } else if (bytes_written < 0) { | |
1103 | if (rc != -EBADF) | |
1104 | rc = bytes_written; | |
1da177e4 | 1105 | } |
6148a742 | 1106 | } else { |
1da177e4 LT |
1107 | cFYI(1, ("No writeable filehandles for inode")); |
1108 | rc = -EIO; | |
1109 | } | |
1110 | ||
1111 | kunmap(page); | |
1112 | return rc; | |
1113 | } | |
1114 | ||
1da177e4 | 1115 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1116 | struct writeback_control *wbc) |
1da177e4 | 1117 | { |
37c0eb46 SF |
1118 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1119 | unsigned int bytes_to_write; | |
1120 | unsigned int bytes_written; | |
1121 | struct cifs_sb_info *cifs_sb; | |
1122 | int done = 0; | |
111ebb6e | 1123 | pgoff_t end; |
37c0eb46 | 1124 | pgoff_t index; |
fb8c4b14 SF |
1125 | int range_whole = 0; |
1126 | struct kvec *iov; | |
84d2f07e | 1127 | int len; |
37c0eb46 SF |
1128 | int n_iov = 0; |
1129 | pgoff_t next; | |
1130 | int nr_pages; | |
1131 | __u64 offset = 0; | |
23e7dd7d | 1132 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1133 | struct page *page; |
1134 | struct pagevec pvec; | |
1135 | int rc = 0; | |
1136 | int scanned = 0; | |
1da177e4 LT |
1137 | int xid; |
1138 | ||
37c0eb46 | 1139 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1140 | |
37c0eb46 SF |
1141 | /* |
1142 | * If wsize is smaller that the page cache size, default to writing | |
1143 | * one page at a time via cifs_writepage | |
1144 | */ | |
1145 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1146 | return generic_writepages(mapping, wbc); | |
1147 | ||
fb8c4b14 SF |
1148 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1149 | if (cifs_sb->tcon->ses->server->secMode & | |
1150 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1151 | if (!experimEnabled) | |
60808233 | 1152 | return generic_writepages(mapping, wbc); |
4a77118c | 1153 | |
9a0c8230 | 1154 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1155 | if (iov == NULL) |
9a0c8230 SF |
1156 | return generic_writepages(mapping, wbc); |
1157 | ||
1158 | ||
37c0eb46 SF |
1159 | /* |
1160 | * BB: Is this meaningful for a non-block-device file system? | |
1161 | * If it is, we should test it again after we do I/O | |
1162 | */ | |
1163 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1164 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1165 | kfree(iov); |
37c0eb46 SF |
1166 | return 0; |
1167 | } | |
1168 | ||
1da177e4 LT |
1169 | xid = GetXid(); |
1170 | ||
37c0eb46 | 1171 | pagevec_init(&pvec, 0); |
111ebb6e | 1172 | if (wbc->range_cyclic) { |
37c0eb46 | 1173 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1174 | end = -1; |
1175 | } else { | |
1176 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1177 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1178 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1179 | range_whole = 1; | |
37c0eb46 SF |
1180 | scanned = 1; |
1181 | } | |
1182 | retry: | |
1183 | while (!done && (index <= end) && | |
1184 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1185 | PAGECACHE_TAG_DIRTY, | |
1186 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1187 | int first; | |
1188 | unsigned int i; | |
1189 | ||
37c0eb46 SF |
1190 | first = -1; |
1191 | next = 0; | |
1192 | n_iov = 0; | |
1193 | bytes_to_write = 0; | |
1194 | ||
1195 | for (i = 0; i < nr_pages; i++) { | |
1196 | page = pvec.pages[i]; | |
1197 | /* | |
1198 | * At this point we hold neither mapping->tree_lock nor | |
1199 | * lock on the page itself: the page may be truncated or | |
1200 | * invalidated (changing page->mapping to NULL), or even | |
1201 | * swizzled back from swapper_space to tmpfs file | |
1202 | * mapping | |
1203 | */ | |
1204 | ||
1205 | if (first < 0) | |
1206 | lock_page(page); | |
1207 | else if (TestSetPageLocked(page)) | |
1208 | break; | |
1209 | ||
1210 | if (unlikely(page->mapping != mapping)) { | |
1211 | unlock_page(page); | |
1212 | break; | |
1213 | } | |
1214 | ||
111ebb6e | 1215 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1216 | done = 1; |
1217 | unlock_page(page); | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | if (next && (page->index != next)) { | |
1222 | /* Not next consecutive page */ | |
1223 | unlock_page(page); | |
1224 | break; | |
1225 | } | |
1226 | ||
1227 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1228 | wait_on_page_writeback(page); | |
1229 | ||
1230 | if (PageWriteback(page) || | |
cb876f45 | 1231 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1232 | unlock_page(page); |
1233 | break; | |
1234 | } | |
84d2f07e | 1235 | |
cb876f45 LT |
1236 | /* |
1237 | * This actually clears the dirty bit in the radix tree. | |
1238 | * See cifs_writepage() for more commentary. | |
1239 | */ | |
1240 | set_page_writeback(page); | |
1241 | ||
84d2f07e SF |
1242 | if (page_offset(page) >= mapping->host->i_size) { |
1243 | done = 1; | |
1244 | unlock_page(page); | |
cb876f45 | 1245 | end_page_writeback(page); |
84d2f07e SF |
1246 | break; |
1247 | } | |
1248 | ||
37c0eb46 SF |
1249 | /* |
1250 | * BB can we get rid of this? pages are held by pvec | |
1251 | */ | |
1252 | page_cache_get(page); | |
1253 | ||
84d2f07e SF |
1254 | len = min(mapping->host->i_size - page_offset(page), |
1255 | (loff_t)PAGE_CACHE_SIZE); | |
1256 | ||
37c0eb46 SF |
1257 | /* reserve iov[0] for the smb header */ |
1258 | n_iov++; | |
1259 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1260 | iov[n_iov].iov_len = len; |
1261 | bytes_to_write += len; | |
37c0eb46 SF |
1262 | |
1263 | if (first < 0) { | |
1264 | first = i; | |
1265 | offset = page_offset(page); | |
1266 | } | |
1267 | next = page->index + 1; | |
1268 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1269 | break; | |
1270 | } | |
1271 | if (n_iov) { | |
23e7dd7d SF |
1272 | /* Search for a writable handle every time we call |
1273 | * CIFSSMBWrite2. We can't rely on the last handle | |
1274 | * we used to still be valid | |
1275 | */ | |
1276 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1277 | if (!open_file) { | |
1278 | cERROR(1, ("No writable handles for inode")); | |
1279 | rc = -EBADF; | |
1047abc1 | 1280 | } else { |
23e7dd7d SF |
1281 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1282 | open_file->netfid, | |
1283 | bytes_to_write, offset, | |
1284 | &bytes_written, iov, n_iov, | |
1285 | 1); | |
1286 | atomic_dec(&open_file->wrtPending); | |
1287 | if (rc || bytes_written < bytes_to_write) { | |
1288 | cERROR(1,("Write2 ret %d, written = %d", | |
1289 | rc, bytes_written)); | |
1290 | /* BB what if continued retry is | |
1291 | requested via mount flags? */ | |
1292 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1293 | } else { |
1294 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1295 | bytes_written); | |
1296 | } | |
37c0eb46 SF |
1297 | } |
1298 | for (i = 0; i < n_iov; i++) { | |
1299 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1300 | /* Should we also set page error on |
1301 | success rc but too little data written? */ | |
1302 | /* BB investigate retry logic on temporary | |
1303 | server crash cases and how recovery works | |
fb8c4b14 SF |
1304 | when page marked as error */ |
1305 | if (rc) | |
eb9bdaa3 | 1306 | SetPageError(page); |
37c0eb46 SF |
1307 | kunmap(page); |
1308 | unlock_page(page); | |
cb876f45 | 1309 | end_page_writeback(page); |
37c0eb46 SF |
1310 | page_cache_release(page); |
1311 | } | |
1312 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1313 | done = 1; | |
1314 | index = next; | |
1315 | } | |
1316 | pagevec_release(&pvec); | |
1317 | } | |
1318 | if (!scanned && !done) { | |
1319 | /* | |
1320 | * We hit the last page and there is more work to be done: wrap | |
1321 | * back to the start of the file | |
1322 | */ | |
1323 | scanned = 1; | |
1324 | index = 0; | |
1325 | goto retry; | |
1326 | } | |
111ebb6e | 1327 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1328 | mapping->writeback_index = index; |
1329 | ||
1da177e4 | 1330 | FreeXid(xid); |
9a0c8230 | 1331 | kfree(iov); |
1da177e4 LT |
1332 | return rc; |
1333 | } | |
1da177e4 | 1334 | |
fb8c4b14 | 1335 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1336 | { |
1337 | int rc = -EFAULT; | |
1338 | int xid; | |
1339 | ||
1340 | xid = GetXid(); | |
1341 | /* BB add check for wbc flags */ | |
1342 | page_cache_get(page); | |
fb8c4b14 | 1343 | if (!PageUptodate(page)) { |
1da177e4 LT |
1344 | cFYI(1, ("ppw - page not up to date")); |
1345 | } | |
cb876f45 LT |
1346 | |
1347 | /* | |
1348 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1349 | * | |
1350 | * A writepage() implementation always needs to do either this, | |
1351 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1352 | * the case of a failure. | |
1353 | * | |
1354 | * Just unlocking the page will cause the radix tree tag-bits | |
1355 | * to fail to update with the state of the page correctly. | |
1356 | */ | |
fb8c4b14 | 1357 | set_page_writeback(page); |
1da177e4 LT |
1358 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1359 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1360 | unlock_page(page); | |
cb876f45 LT |
1361 | end_page_writeback(page); |
1362 | page_cache_release(page); | |
1da177e4 LT |
1363 | FreeXid(xid); |
1364 | return rc; | |
1365 | } | |
1366 | ||
1367 | static int cifs_commit_write(struct file *file, struct page *page, | |
1368 | unsigned offset, unsigned to) | |
1369 | { | |
1370 | int xid; | |
1371 | int rc = 0; | |
1372 | struct inode *inode = page->mapping->host; | |
1373 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1374 | char *page_data; | |
1375 | ||
1376 | xid = GetXid(); | |
fb8c4b14 | 1377 | cFYI(1, ("commit write for page %p up to position %lld for %d", |
1da177e4 | 1378 | page, position, to)); |
3677db10 | 1379 | spin_lock(&inode->i_lock); |
1da177e4 LT |
1380 | if (position > inode->i_size) { |
1381 | i_size_write(inode, position); | |
1da177e4 | 1382 | } |
3677db10 | 1383 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
1384 | if (!PageUptodate(page)) { |
1385 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1386 | /* can not rely on (or let) writepage write this data */ | |
1387 | if (to < offset) { | |
1388 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1389 | offset, to)); | |
1390 | FreeXid(xid); | |
1391 | return rc; | |
1392 | } | |
1393 | /* this is probably better than directly calling | |
1394 | partialpage_write since in this function the file handle is | |
1395 | known which we might as well leverage */ | |
1396 | /* BB check if anything else missing out of ppw | |
1397 | such as updating last write time */ | |
1398 | page_data = kmap(page); | |
1399 | rc = cifs_write(file, page_data + offset, to-offset, | |
1400 | &position); | |
1401 | if (rc > 0) | |
1402 | rc = 0; | |
1403 | /* else if (rc < 0) should we set writebehind rc? */ | |
1404 | kunmap(page); | |
fb8c4b14 | 1405 | } else { |
1da177e4 LT |
1406 | set_page_dirty(page); |
1407 | } | |
1408 | ||
1409 | FreeXid(xid); | |
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1414 | { | |
1415 | int xid; | |
1416 | int rc = 0; | |
e6a00296 | 1417 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1418 | |
1419 | xid = GetXid(); | |
1420 | ||
fb8c4b14 | 1421 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1422 | dentry->d_name.name, datasync)); |
50c2f753 | 1423 | |
1da177e4 LT |
1424 | rc = filemap_fdatawrite(inode->i_mapping); |
1425 | if (rc == 0) | |
1426 | CIFS_I(inode)->write_behind_rc = 0; | |
1427 | FreeXid(xid); | |
1428 | return rc; | |
1429 | } | |
1430 | ||
3978d717 | 1431 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1432 | { |
1433 | struct address_space *mapping; | |
1434 | struct inode *inode; | |
1435 | unsigned long index = page->index; | |
1436 | unsigned int rpages = 0; | |
1437 | int rc = 0; | |
1438 | ||
1439 | cFYI(1, ("sync page %p",page)); | |
1440 | mapping = page->mapping; | |
1441 | if (!mapping) | |
1442 | return 0; | |
1443 | inode = mapping->host; | |
1444 | if (!inode) | |
3978d717 | 1445 | return; */ |
1da177e4 | 1446 | |
fb8c4b14 | 1447 | /* fill in rpages then |
1da177e4 LT |
1448 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1449 | ||
26a21b98 | 1450 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1451 | |
3978d717 | 1452 | #if 0 |
1da177e4 LT |
1453 | if (rc < 0) |
1454 | return rc; | |
1455 | return 0; | |
3978d717 | 1456 | #endif |
1da177e4 LT |
1457 | } */ |
1458 | ||
1459 | /* | |
1460 | * As file closes, flush all cached write data for this inode checking | |
1461 | * for write behind errors. | |
1462 | */ | |
75e1fcc0 | 1463 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1464 | { |
fb8c4b14 | 1465 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1466 | int rc = 0; |
1467 | ||
1468 | /* Rather than do the steps manually: | |
1469 | lock the inode for writing | |
1470 | loop through pages looking for write behind data (dirty pages) | |
1471 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1472 | send to server (prefer in parallel) | |
1473 | deal with writebehind errors | |
1474 | unlock inode for writing | |
1475 | filemapfdatawrite appears easier for the time being */ | |
1476 | ||
1477 | rc = filemap_fdatawrite(inode->i_mapping); | |
1478 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1479 | CIFS_I(inode)->write_behind_rc = 0; | |
50c2f753 | 1480 | |
fb8c4b14 | 1481 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1482 | |
1483 | return rc; | |
1484 | } | |
1485 | ||
1486 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1487 | size_t read_size, loff_t *poffset) | |
1488 | { | |
1489 | int rc = -EACCES; | |
1490 | unsigned int bytes_read = 0; | |
1491 | unsigned int total_read = 0; | |
1492 | unsigned int current_read_size; | |
1493 | struct cifs_sb_info *cifs_sb; | |
1494 | struct cifsTconInfo *pTcon; | |
1495 | int xid; | |
1496 | struct cifsFileInfo *open_file; | |
1497 | char *smb_read_data; | |
1498 | char __user *current_offset; | |
1499 | struct smb_com_read_rsp *pSMBr; | |
1500 | ||
1501 | xid = GetXid(); | |
e6a00296 | 1502 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1503 | pTcon = cifs_sb->tcon; |
1504 | ||
1505 | if (file->private_data == NULL) { | |
1506 | FreeXid(xid); | |
1507 | return -EBADF; | |
1508 | } | |
1509 | open_file = (struct cifsFileInfo *)file->private_data; | |
1510 | ||
1511 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1512 | cFYI(1, ("attempting read on write only file instance")); | |
1513 | } | |
1514 | for (total_read = 0, current_offset = read_data; | |
1515 | read_size > total_read; | |
1516 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1517 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1518 | cifs_sb->rsize); |
1519 | rc = -EAGAIN; | |
1520 | smb_read_data = NULL; | |
1521 | while (rc == -EAGAIN) { | |
ec637e3f | 1522 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1523 | if ((open_file->invalidHandle) && |
1da177e4 | 1524 | (!open_file->closePend)) { |
3a9f462f | 1525 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
1526 | if (rc != 0) |
1527 | break; | |
1528 | } | |
bfa0d75a | 1529 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1530 | open_file->netfid, |
1531 | current_read_size, *poffset, | |
1532 | &bytes_read, &smb_read_data, | |
1533 | &buf_type); | |
1da177e4 | 1534 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1535 | if (smb_read_data) { |
93544cc6 SF |
1536 | if (copy_to_user(current_offset, |
1537 | smb_read_data + | |
1538 | 4 /* RFC1001 length field */ + | |
1539 | le16_to_cpu(pSMBr->DataOffset), | |
1540 | bytes_read)) { | |
1541 | rc = -EFAULT; | |
1542 | } | |
1543 | ||
fb8c4b14 | 1544 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1545 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1546 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1547 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1548 | smb_read_data = NULL; |
1549 | } | |
1550 | } | |
1551 | if (rc || (bytes_read == 0)) { | |
1552 | if (total_read) { | |
1553 | break; | |
1554 | } else { | |
1555 | FreeXid(xid); | |
1556 | return rc; | |
1557 | } | |
1558 | } else { | |
a4544347 | 1559 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1560 | *poffset += bytes_read; |
1561 | } | |
1562 | } | |
1563 | FreeXid(xid); | |
1564 | return total_read; | |
1565 | } | |
1566 | ||
1567 | ||
1568 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1569 | loff_t *poffset) | |
1570 | { | |
1571 | int rc = -EACCES; | |
1572 | unsigned int bytes_read = 0; | |
1573 | unsigned int total_read; | |
1574 | unsigned int current_read_size; | |
1575 | struct cifs_sb_info *cifs_sb; | |
1576 | struct cifsTconInfo *pTcon; | |
1577 | int xid; | |
1578 | char *current_offset; | |
1579 | struct cifsFileInfo *open_file; | |
ec637e3f | 1580 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1581 | |
1582 | xid = GetXid(); | |
e6a00296 | 1583 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1584 | pTcon = cifs_sb->tcon; |
1585 | ||
1586 | if (file->private_data == NULL) { | |
1587 | FreeXid(xid); | |
1588 | return -EBADF; | |
1589 | } | |
1590 | open_file = (struct cifsFileInfo *)file->private_data; | |
1591 | ||
1592 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1593 | cFYI(1, ("attempting read on write only file instance")); | |
1594 | ||
fb8c4b14 | 1595 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1596 | read_size > total_read; |
1597 | total_read += bytes_read, current_offset += bytes_read) { | |
1598 | current_read_size = min_t(const int, read_size - total_read, | |
1599 | cifs_sb->rsize); | |
f9f5c817 SF |
1600 | /* For windows me and 9x we do not want to request more |
1601 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1602 | if ((pTcon->ses) && |
f9f5c817 SF |
1603 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1604 | current_read_size = min_t(const int, current_read_size, | |
1605 | pTcon->ses->server->maxBuf - 128); | |
1606 | } | |
1da177e4 LT |
1607 | rc = -EAGAIN; |
1608 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1609 | if ((open_file->invalidHandle) && |
1da177e4 | 1610 | (!open_file->closePend)) { |
3a9f462f | 1611 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
1612 | if (rc != 0) |
1613 | break; | |
1614 | } | |
bfa0d75a | 1615 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1616 | open_file->netfid, |
1617 | current_read_size, *poffset, | |
1618 | &bytes_read, ¤t_offset, | |
1619 | &buf_type); | |
1da177e4 LT |
1620 | } |
1621 | if (rc || (bytes_read == 0)) { | |
1622 | if (total_read) { | |
1623 | break; | |
1624 | } else { | |
1625 | FreeXid(xid); | |
1626 | return rc; | |
1627 | } | |
1628 | } else { | |
a4544347 | 1629 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1630 | *poffset += bytes_read; |
1631 | } | |
1632 | } | |
1633 | FreeXid(xid); | |
1634 | return total_read; | |
1635 | } | |
1636 | ||
1637 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1638 | { | |
e6a00296 | 1639 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1640 | int rc, xid; |
1641 | ||
1642 | xid = GetXid(); | |
1643 | rc = cifs_revalidate(dentry); | |
1644 | if (rc) { | |
1645 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1646 | FreeXid(xid); | |
1647 | return rc; | |
1648 | } | |
1649 | rc = generic_file_mmap(file, vma); | |
1650 | FreeXid(xid); | |
1651 | return rc; | |
1652 | } | |
1653 | ||
1654 | ||
fb8c4b14 | 1655 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1656 | struct list_head *pages, int bytes_read, char *data, |
1657 | struct pagevec *plru_pvec) | |
1658 | { | |
1659 | struct page *page; | |
1660 | char *target; | |
1661 | ||
1662 | while (bytes_read > 0) { | |
1663 | if (list_empty(pages)) | |
1664 | break; | |
1665 | ||
1666 | page = list_entry(pages->prev, struct page, lru); | |
1667 | list_del(&page->lru); | |
1668 | ||
1669 | if (add_to_page_cache(page, mapping, page->index, | |
1670 | GFP_KERNEL)) { | |
1671 | page_cache_release(page); | |
1672 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1673 | data += PAGE_CACHE_SIZE; |
1674 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1675 | continue; |
1676 | } | |
1677 | ||
fb8c4b14 | 1678 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1679 | |
1680 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1681 | memcpy(target, data, bytes_read); | |
1682 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1683 | memset(target + bytes_read, 0, |
1da177e4 LT |
1684 | PAGE_CACHE_SIZE - bytes_read); |
1685 | bytes_read = 0; | |
1686 | } else { | |
1687 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1688 | bytes_read -= PAGE_CACHE_SIZE; | |
1689 | } | |
1690 | kunmap_atomic(target, KM_USER0); | |
1691 | ||
1692 | flush_dcache_page(page); | |
1693 | SetPageUptodate(page); | |
1694 | unlock_page(page); | |
1695 | if (!pagevec_add(plru_pvec, page)) | |
1696 | __pagevec_lru_add(plru_pvec); | |
1697 | data += PAGE_CACHE_SIZE; | |
1698 | } | |
1699 | return; | |
1700 | } | |
1701 | ||
1702 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1703 | struct list_head *page_list, unsigned num_pages) | |
1704 | { | |
1705 | int rc = -EACCES; | |
1706 | int xid; | |
1707 | loff_t offset; | |
1708 | struct page *page; | |
1709 | struct cifs_sb_info *cifs_sb; | |
1710 | struct cifsTconInfo *pTcon; | |
1711 | int bytes_read = 0; | |
fb8c4b14 | 1712 | unsigned int read_size, i; |
1da177e4 LT |
1713 | char *smb_read_data = NULL; |
1714 | struct smb_com_read_rsp *pSMBr; | |
1715 | struct pagevec lru_pvec; | |
1716 | struct cifsFileInfo *open_file; | |
ec637e3f | 1717 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1718 | |
1719 | xid = GetXid(); | |
1720 | if (file->private_data == NULL) { | |
1721 | FreeXid(xid); | |
1722 | return -EBADF; | |
1723 | } | |
1724 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1725 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1726 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1727 | |
1da177e4 | 1728 | pagevec_init(&lru_pvec, 0); |
75865f8c | 1729 | #ifdef CONFIG_CIFS_DEBUG2 |
fb8c4b14 SF |
1730 | cFYI(1, ("rpages: num pages %d", num_pages)); |
1731 | #endif | |
1da177e4 LT |
1732 | for (i = 0; i < num_pages; ) { |
1733 | unsigned contig_pages; | |
1734 | struct page *tmp_page; | |
1735 | unsigned long expected_index; | |
1736 | ||
1737 | if (list_empty(page_list)) | |
1738 | break; | |
1739 | ||
1740 | page = list_entry(page_list->prev, struct page, lru); | |
1741 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1742 | ||
1743 | /* count adjacent pages that we will read into */ | |
1744 | contig_pages = 0; | |
fb8c4b14 | 1745 | expected_index = |
1da177e4 | 1746 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1747 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1748 | if (tmp_page->index == expected_index) { |
1749 | contig_pages++; | |
1750 | expected_index++; | |
1751 | } else | |
fb8c4b14 | 1752 | break; |
1da177e4 LT |
1753 | } |
1754 | if (contig_pages + i > num_pages) | |
1755 | contig_pages = num_pages - i; | |
1756 | ||
1757 | /* for reads over a certain size could initiate async | |
1758 | read ahead */ | |
1759 | ||
1760 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1761 | /* Read size needs to be in multiples of one page */ | |
1762 | read_size = min_t(const unsigned int, read_size, | |
1763 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
75865f8c | 1764 | #ifdef CONFIG_CIFS_DEBUG2 |
fb8c4b14 | 1765 | cFYI(1, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 1766 | read_size, contig_pages)); |
fb8c4b14 | 1767 | #endif |
1da177e4 LT |
1768 | rc = -EAGAIN; |
1769 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1770 | if ((open_file->invalidHandle) && |
1da177e4 | 1771 | (!open_file->closePend)) { |
3a9f462f | 1772 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
1773 | if (rc != 0) |
1774 | break; | |
1775 | } | |
1776 | ||
bfa0d75a | 1777 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1778 | open_file->netfid, |
1779 | read_size, offset, | |
1780 | &bytes_read, &smb_read_data, | |
1781 | &buf_type); | |
a9d02ad4 | 1782 | /* BB more RC checks ? */ |
fb8c4b14 | 1783 | if (rc == -EAGAIN) { |
1da177e4 | 1784 | if (smb_read_data) { |
fb8c4b14 | 1785 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1786 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1787 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1788 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1789 | smb_read_data = NULL; |
1790 | } | |
1791 | } | |
1792 | } | |
1793 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1794 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1795 | break; |
1796 | } else if (bytes_read > 0) { | |
6f88cc2e | 1797 | task_io_account_read(bytes_read); |
1da177e4 LT |
1798 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1799 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1800 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1801 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1802 | ||
1803 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1804 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1805 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1806 | i++; /* account for partial page */ | |
1807 | ||
fb8c4b14 | 1808 | /* server copy of file can have smaller size |
1da177e4 | 1809 | than client */ |
fb8c4b14 SF |
1810 | /* BB do we need to verify this common case ? |
1811 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1812 | we will hit it on next read */ |
1813 | ||
05ac9d4b | 1814 | /* break; */ |
1da177e4 LT |
1815 | } |
1816 | } else { | |
1817 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1818 | "Cleaning remaining pages from readahead list", | |
1819 | bytes_read, offset)); | |
fb8c4b14 | 1820 | /* BB turn off caching and do new lookup on |
1da177e4 | 1821 | file size at server? */ |
1da177e4 LT |
1822 | break; |
1823 | } | |
1824 | if (smb_read_data) { | |
fb8c4b14 | 1825 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1826 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1827 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1828 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1829 | smb_read_data = NULL; |
1830 | } | |
1831 | bytes_read = 0; | |
1832 | } | |
1833 | ||
1834 | pagevec_lru_add(&lru_pvec); | |
1835 | ||
1836 | /* need to free smb_read_data buf before exit */ | |
1837 | if (smb_read_data) { | |
fb8c4b14 | 1838 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1839 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1840 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1841 | cifs_buf_release(smb_read_data); |
1da177e4 | 1842 | smb_read_data = NULL; |
fb8c4b14 | 1843 | } |
1da177e4 LT |
1844 | |
1845 | FreeXid(xid); | |
1846 | return rc; | |
1847 | } | |
1848 | ||
1849 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1850 | loff_t *poffset) | |
1851 | { | |
1852 | char *read_data; | |
1853 | int rc; | |
1854 | ||
1855 | page_cache_get(page); | |
1856 | read_data = kmap(page); | |
1857 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1858 | |
1da177e4 | 1859 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1860 | |
1da177e4 LT |
1861 | if (rc < 0) |
1862 | goto io_error; | |
1863 | else | |
fb8c4b14 SF |
1864 | cFYI(1, ("Bytes read %d", rc)); |
1865 | ||
e6a00296 JJS |
1866 | file->f_path.dentry->d_inode->i_atime = |
1867 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1868 | |
1da177e4 LT |
1869 | if (PAGE_CACHE_SIZE > rc) |
1870 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1871 | ||
1872 | flush_dcache_page(page); | |
1873 | SetPageUptodate(page); | |
1874 | rc = 0; | |
fb8c4b14 | 1875 | |
1da177e4 | 1876 | io_error: |
fb8c4b14 | 1877 | kunmap(page); |
1da177e4 LT |
1878 | page_cache_release(page); |
1879 | return rc; | |
1880 | } | |
1881 | ||
1882 | static int cifs_readpage(struct file *file, struct page *page) | |
1883 | { | |
1884 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1885 | int rc = -EACCES; | |
1886 | int xid; | |
1887 | ||
1888 | xid = GetXid(); | |
1889 | ||
1890 | if (file->private_data == NULL) { | |
1891 | FreeXid(xid); | |
1892 | return -EBADF; | |
1893 | } | |
1894 | ||
fb8c4b14 | 1895 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
1896 | page, (int)offset, (int)offset)); |
1897 | ||
1898 | rc = cifs_readpage_worker(file, page, &offset); | |
1899 | ||
1900 | unlock_page(page); | |
1901 | ||
1902 | FreeXid(xid); | |
1903 | return rc; | |
1904 | } | |
1905 | ||
1906 | /* We do not want to update the file size from server for inodes | |
1907 | open for write - to avoid races with writepage extending | |
1908 | the file - in the future we could consider allowing | |
fb8c4b14 | 1909 | refreshing the inode only on increases in the file size |
1da177e4 LT |
1910 | but this is tricky to do without racing with writebehind |
1911 | page caching in the current Linux kernel design */ | |
7ba52631 | 1912 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 1913 | { |
23e7dd7d SF |
1914 | struct cifsFileInfo *open_file = NULL; |
1915 | ||
1916 | if (cifsInode) | |
1917 | open_file = find_writable_file(cifsInode); | |
50c2f753 | 1918 | |
fb8c4b14 | 1919 | if (open_file) { |
c32a0b68 SF |
1920 | struct cifs_sb_info *cifs_sb; |
1921 | ||
23e7dd7d SF |
1922 | /* there is not actually a write pending so let |
1923 | this handle go free and allow it to | |
1924 | be closable if needed */ | |
1925 | atomic_dec(&open_file->wrtPending); | |
c32a0b68 SF |
1926 | |
1927 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); | |
1928 | if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) { | |
fb8c4b14 | 1929 | /* since no page cache to corrupt on directio |
c32a0b68 SF |
1930 | we can change size safely */ |
1931 | return 1; | |
1932 | } | |
1933 | ||
fb8c4b14 | 1934 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
7ba52631 SF |
1935 | return 1; |
1936 | ||
6148a742 | 1937 | return 0; |
23e7dd7d | 1938 | } else |
6148a742 | 1939 | return 1; |
1da177e4 LT |
1940 | } |
1941 | ||
1da177e4 LT |
1942 | static int cifs_prepare_write(struct file *file, struct page *page, |
1943 | unsigned from, unsigned to) | |
1944 | { | |
1945 | int rc = 0; | |
8a236264 SF |
1946 | loff_t i_size; |
1947 | loff_t offset; | |
1948 | ||
fb8c4b14 | 1949 | cFYI(1, ("prepare write for page %p from %d to %d", page, from, to)); |
8a236264 SF |
1950 | if (PageUptodate(page)) |
1951 | return 0; | |
1952 | ||
1953 | /* If we are writing a full page it will be up to date, | |
1954 | no need to read from the server */ | |
1955 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { | |
1956 | SetPageUptodate(page); | |
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1961 | i_size = i_size_read(page->mapping->host); | |
1962 | ||
1963 | if ((offset >= i_size) || | |
1964 | ((from == 0) && (offset + to) >= i_size)) { | |
1965 | /* | |
1966 | * We don't need to read data beyond the end of the file. | |
1967 | * zero it, and set the page uptodate | |
1968 | */ | |
1969 | void *kaddr = kmap_atomic(page, KM_USER0); | |
1970 | ||
1971 | if (from) | |
1da177e4 | 1972 | memset(kaddr, 0, from); |
8a236264 | 1973 | if (to < PAGE_CACHE_SIZE) |
1da177e4 | 1974 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); |
8a236264 SF |
1975 | flush_dcache_page(page); |
1976 | kunmap_atomic(kaddr, KM_USER0); | |
1977 | SetPageUptodate(page); | |
1978 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1da177e4 | 1979 | /* might as well read a page, it is fast enough */ |
8a236264 SF |
1980 | rc = cifs_readpage_worker(file, page, &offset); |
1981 | } else { | |
1982 | /* we could try using another file handle if there is one - | |
1983 | but how would we lock it to prevent close of that handle | |
1984 | racing with this read? In any case | |
1985 | this will be written out by commit_write so is fine */ | |
1da177e4 LT |
1986 | } |
1987 | ||
fb8c4b14 SF |
1988 | /* we do not need to pass errors back |
1989 | e.g. if we do not have read access to the file | |
8a236264 SF |
1990 | because cifs_commit_write will do the right thing. -- shaggy */ |
1991 | ||
1da177e4 LT |
1992 | return 0; |
1993 | } | |
1994 | ||
f5e54d6e | 1995 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
1996 | .readpage = cifs_readpage, |
1997 | .readpages = cifs_readpages, | |
1998 | .writepage = cifs_writepage, | |
37c0eb46 | 1999 | .writepages = cifs_writepages, |
1da177e4 LT |
2000 | .prepare_write = cifs_prepare_write, |
2001 | .commit_write = cifs_commit_write, | |
2002 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2003 | /* .sync_page = cifs_sync_page, */ | |
2004 | /* .direct_IO = */ | |
2005 | }; | |
273d81d6 DK |
2006 | |
2007 | /* | |
2008 | * cifs_readpages requires the server to support a buffer large enough to | |
2009 | * contain the header plus one complete page of data. Otherwise, we need | |
2010 | * to leave cifs_readpages out of the address space operations. | |
2011 | */ | |
f5e54d6e | 2012 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2013 | .readpage = cifs_readpage, |
2014 | .writepage = cifs_writepage, | |
2015 | .writepages = cifs_writepages, | |
2016 | .prepare_write = cifs_prepare_write, | |
2017 | .commit_write = cifs_commit_write, | |
2018 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2019 | /* .sync_page = cifs_sync_page, */ | |
2020 | /* .direct_IO = */ | |
2021 | }; |