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: | |
c18c842b | 141 | if (pTcon->unix_ext) |
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 */ | |
c18c842b | 306 | if (pTcon->unix_ext) { |
1da177e4 LT |
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; | |
c18c842b | 433 | if (pTcon->unix_ext) |
1da177e4 LT |
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; | |
15745320 | 470 | int xid, timeout; |
1da177e4 LT |
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) { | |
15745320 | 488 | timeout = 2; |
fb8c4b14 | 489 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 490 | && (timeout <= 2048)) { |
23e7dd7d SF |
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)) |
63135e08 SF |
505 | cERROR(1, |
506 | ("close with pending writes")); | |
1da177e4 LT |
507 | rc = CIFSSMBClose(xid, pTcon, |
508 | pSMBFile->netfid); | |
1da177e4 LT |
509 | } |
510 | } | |
7ee1af76 JA |
511 | |
512 | /* Delete any outstanding lock records. | |
513 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 514 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
515 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
516 | list_del(&li->llist); | |
517 | kfree(li); | |
518 | } | |
796e5661 | 519 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 520 | |
cbe0476f | 521 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
522 | list_del(&pSMBFile->flist); |
523 | list_del(&pSMBFile->tlist); | |
cbe0476f | 524 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
525 | timeout = 10; |
526 | /* We waited above to give the SMBWrite a chance to issue | |
527 | on the wire (so we do not get SMBWrite returning EBADF | |
528 | if writepages is racing with close. Note that writepages | |
529 | does not specify a file handle, so it is possible for a file | |
530 | to be opened twice, and the application close the "wrong" | |
531 | file handle - in these cases we delay long enough to allow | |
532 | the SMBWrite to get on the wire before the SMB Close. | |
533 | We allow total wait here over 45 seconds, more than | |
534 | oplock break time, and more than enough to allow any write | |
535 | to complete on the server, or to time out on the client */ | |
536 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
537 | && (timeout <= 50000)) { | |
538 | cERROR(1, ("writes pending, delay free of handle")); | |
539 | msleep(timeout); | |
540 | timeout *= 8; | |
541 | } | |
1da177e4 LT |
542 | kfree(pSMBFile->search_resume_name); |
543 | kfree(file->private_data); | |
544 | file->private_data = NULL; | |
545 | } else | |
546 | rc = -EBADF; | |
547 | ||
4efa53f0 | 548 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
549 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
550 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
551 | /* if the file is not open we do not know if we can cache info | |
552 | on this inode, much less write behind and read ahead */ | |
553 | CIFS_I(inode)->clientCanCacheRead = FALSE; | |
554 | CIFS_I(inode)->clientCanCacheAll = FALSE; | |
555 | } | |
4efa53f0 | 556 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 557 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
558 | rc = CIFS_I(inode)->write_behind_rc; |
559 | FreeXid(xid); | |
560 | return rc; | |
561 | } | |
562 | ||
563 | int cifs_closedir(struct inode *inode, struct file *file) | |
564 | { | |
565 | int rc = 0; | |
566 | int xid; | |
567 | struct cifsFileInfo *pCFileStruct = | |
568 | (struct cifsFileInfo *)file->private_data; | |
569 | char *ptmp; | |
570 | ||
26a21b98 | 571 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
572 | |
573 | xid = GetXid(); | |
574 | ||
575 | if (pCFileStruct) { | |
576 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
577 | struct cifs_sb_info *cifs_sb = |
578 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
579 | |
580 | pTcon = cifs_sb->tcon; | |
581 | ||
582 | cFYI(1, ("Freeing private data in close dir")); | |
31ca3bc3 SF |
583 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
584 | (pCFileStruct->invalidHandle == FALSE)) { | |
1da177e4 LT |
585 | pCFileStruct->invalidHandle = TRUE; |
586 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); | |
587 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
588 | rc)); | |
589 | /* not much we can do if it fails anyway, ignore rc */ | |
590 | rc = 0; | |
591 | } | |
592 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
593 | if (ptmp) { | |
ec637e3f | 594 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 595 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 596 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
597 | cifs_small_buf_release(ptmp); |
598 | else | |
599 | cifs_buf_release(ptmp); | |
1da177e4 LT |
600 | } |
601 | ptmp = pCFileStruct->search_resume_name; | |
602 | if (ptmp) { | |
ec637e3f | 603 | cFYI(1, ("closedir free resume name")); |
1da177e4 LT |
604 | pCFileStruct->search_resume_name = NULL; |
605 | kfree(ptmp); | |
606 | } | |
607 | kfree(file->private_data); | |
608 | file->private_data = NULL; | |
609 | } | |
610 | /* BB can we lock the filestruct while this is going on? */ | |
611 | FreeXid(xid); | |
612 | return rc; | |
613 | } | |
614 | ||
7ee1af76 JA |
615 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
616 | __u64 offset, __u8 lockType) | |
617 | { | |
fb8c4b14 SF |
618 | struct cifsLockInfo *li = |
619 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
620 | if (li == NULL) |
621 | return -ENOMEM; | |
622 | li->offset = offset; | |
623 | li->length = len; | |
624 | li->type = lockType; | |
796e5661 | 625 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 626 | list_add(&li->llist, &fid->llist); |
796e5661 | 627 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
628 | return 0; |
629 | } | |
630 | ||
1da177e4 LT |
631 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
632 | { | |
633 | int rc, xid; | |
1da177e4 LT |
634 | __u32 numLock = 0; |
635 | __u32 numUnlock = 0; | |
636 | __u64 length; | |
637 | int wait_flag = FALSE; | |
638 | struct cifs_sb_info *cifs_sb; | |
639 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
640 | __u16 netfid; |
641 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
7ee1af76 | 642 | int posix_locking; |
1da177e4 LT |
643 | |
644 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
645 | rc = -EACCES; | |
646 | xid = GetXid(); | |
647 | ||
648 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
649 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
650 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
651 | pfLock->fl_end)); | |
1da177e4 LT |
652 | |
653 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 654 | cFYI(1, ("Posix")); |
1da177e4 | 655 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 656 | cFYI(1, ("Flock")); |
1da177e4 | 657 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 658 | cFYI(1, ("Blocking lock")); |
1da177e4 LT |
659 | wait_flag = TRUE; |
660 | } | |
661 | if (pfLock->fl_flags & FL_ACCESS) | |
662 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 663 | "not implemented yet")); |
1da177e4 LT |
664 | if (pfLock->fl_flags & FL_LEASE) |
665 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 666 | if (pfLock->fl_flags & |
1da177e4 LT |
667 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
668 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
669 | ||
670 | if (pfLock->fl_type == F_WRLCK) { | |
671 | cFYI(1, ("F_WRLCK ")); | |
672 | numLock = 1; | |
673 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 674 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 675 | numUnlock = 1; |
d47d7c1a SF |
676 | /* Check if unlock includes more than |
677 | one lock range */ | |
1da177e4 | 678 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 679 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
680 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
681 | numLock = 1; | |
682 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 683 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
684 | numLock = 1; |
685 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 686 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
687 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
688 | numLock = 1; | |
689 | } else | |
d47d7c1a | 690 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 691 | |
e6a00296 | 692 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
693 | pTcon = cifs_sb->tcon; |
694 | ||
695 | if (file->private_data == NULL) { | |
696 | FreeXid(xid); | |
697 | return -EBADF; | |
698 | } | |
08547b03 SF |
699 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
700 | ||
7ee1af76 JA |
701 | posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
702 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability)); | |
1da177e4 | 703 | |
08547b03 SF |
704 | /* BB add code here to normalize offset and length to |
705 | account for negative length which we can not accept over the | |
706 | wire */ | |
1da177e4 | 707 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 708 | if (posix_locking) { |
08547b03 | 709 | int posix_lock_type; |
fb8c4b14 | 710 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
711 | posix_lock_type = CIFS_RDLCK; |
712 | else | |
713 | posix_lock_type = CIFS_WRLCK; | |
714 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, | |
fc94cdb9 | 715 | length, pfLock, |
08547b03 SF |
716 | posix_lock_type, wait_flag); |
717 | FreeXid(xid); | |
718 | return rc; | |
719 | } | |
720 | ||
721 | /* BB we could chain these into one lock request BB */ | |
722 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, | |
723 | 0, 1, lockType, 0 /* wait flag */ ); | |
1da177e4 | 724 | if (rc == 0) { |
fb8c4b14 | 725 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
1da177e4 LT |
726 | pfLock->fl_start, 1 /* numUnlock */ , |
727 | 0 /* numLock */ , lockType, | |
728 | 0 /* wait flag */ ); | |
729 | pfLock->fl_type = F_UNLCK; | |
730 | if (rc != 0) | |
731 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 732 | "range %d during test of lock", rc)); |
1da177e4 LT |
733 | rc = 0; |
734 | ||
735 | } else { | |
736 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
737 | rc = 0; /* do not change lock type to unlock | |
738 | since range in use */ | |
739 | } | |
740 | ||
741 | FreeXid(xid); | |
742 | return rc; | |
743 | } | |
7ee1af76 JA |
744 | |
745 | if (!numLock && !numUnlock) { | |
746 | /* if no lock or unlock then nothing | |
747 | to do since we do not know what it is */ | |
748 | FreeXid(xid); | |
749 | return -EOPNOTSUPP; | |
750 | } | |
751 | ||
752 | if (posix_locking) { | |
08547b03 | 753 | int posix_lock_type; |
fb8c4b14 | 754 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
755 | posix_lock_type = CIFS_RDLCK; |
756 | else | |
757 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 758 | |
fb8c4b14 | 759 | if (numUnlock == 1) |
beb84dc8 | 760 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 761 | |
08547b03 | 762 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, |
fc94cdb9 | 763 | length, pfLock, |
08547b03 | 764 | posix_lock_type, wait_flag); |
7ee1af76 | 765 | } else { |
fb8c4b14 SF |
766 | struct cifsFileInfo *fid = |
767 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
768 | |
769 | if (numLock) { | |
fb8c4b14 SF |
770 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
771 | pfLock->fl_start, | |
7ee1af76 JA |
772 | 0, numLock, lockType, wait_flag); |
773 | ||
774 | if (rc == 0) { | |
775 | /* For Windows locks we must store them. */ | |
776 | rc = store_file_lock(fid, length, | |
777 | pfLock->fl_start, lockType); | |
778 | } | |
779 | } else if (numUnlock) { | |
780 | /* For each stored lock that this unlock overlaps | |
781 | completely, unlock it. */ | |
782 | int stored_rc = 0; | |
783 | struct cifsLockInfo *li, *tmp; | |
784 | ||
6b70c955 | 785 | rc = 0; |
796e5661 | 786 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
787 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
788 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 789 | (pfLock->fl_start + length) >= |
39db810c | 790 | (li->offset + li->length)) { |
fb8c4b14 SF |
791 | stored_rc = CIFSSMBLock(xid, pTcon, |
792 | netfid, | |
7ee1af76 JA |
793 | li->length, li->offset, |
794 | 1, 0, li->type, FALSE); | |
795 | if (stored_rc) | |
796 | rc = stored_rc; | |
797 | ||
798 | list_del(&li->llist); | |
799 | kfree(li); | |
800 | } | |
801 | } | |
796e5661 | 802 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
803 | } |
804 | } | |
805 | ||
d634cc15 | 806 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
807 | posix_lock_file_wait(file, pfLock); |
808 | FreeXid(xid); | |
809 | return rc; | |
810 | } | |
811 | ||
812 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
813 | size_t write_size, loff_t *poffset) | |
814 | { | |
815 | int rc = 0; | |
816 | unsigned int bytes_written = 0; | |
817 | unsigned int total_written; | |
818 | struct cifs_sb_info *cifs_sb; | |
819 | struct cifsTconInfo *pTcon; | |
820 | int xid, long_op; | |
821 | struct cifsFileInfo *open_file; | |
822 | ||
e6a00296 | 823 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
824 | |
825 | pTcon = cifs_sb->tcon; | |
826 | ||
827 | /* cFYI(1, | |
828 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 829 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
830 | |
831 | if (file->private_data == NULL) | |
832 | return -EBADF; | |
c33f8d32 | 833 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 834 | |
1da177e4 | 835 | xid = GetXid(); |
1da177e4 | 836 | |
e6a00296 | 837 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
838 | long_op = 2; /* writes past end of file can take a long time */ |
839 | else | |
840 | long_op = 1; | |
841 | ||
842 | for (total_written = 0; write_size > total_written; | |
843 | total_written += bytes_written) { | |
844 | rc = -EAGAIN; | |
845 | while (rc == -EAGAIN) { | |
846 | if (file->private_data == NULL) { | |
847 | /* file has been closed on us */ | |
848 | FreeXid(xid); | |
849 | /* if we have gotten here we have written some data | |
850 | and blocked, and the file has been freed on us while | |
851 | we blocked so return what we managed to write */ | |
852 | return total_written; | |
fb8c4b14 | 853 | } |
1da177e4 LT |
854 | if (open_file->closePend) { |
855 | FreeXid(xid); | |
856 | if (total_written) | |
857 | return total_written; | |
858 | else | |
859 | return -EBADF; | |
860 | } | |
861 | if (open_file->invalidHandle) { | |
1da177e4 LT |
862 | /* we could deadlock if we called |
863 | filemap_fdatawait from here so tell | |
864 | reopen_file not to flush data to server | |
865 | now */ | |
3a9f462f | 866 | rc = cifs_reopen_file(file, FALSE); |
1da177e4 LT |
867 | if (rc != 0) |
868 | break; | |
869 | } | |
870 | ||
871 | rc = CIFSSMBWrite(xid, pTcon, | |
872 | open_file->netfid, | |
873 | min_t(const int, cifs_sb->wsize, | |
874 | write_size - total_written), | |
875 | *poffset, &bytes_written, | |
876 | NULL, write_data + total_written, long_op); | |
877 | } | |
878 | if (rc || (bytes_written == 0)) { | |
879 | if (total_written) | |
880 | break; | |
881 | else { | |
882 | FreeXid(xid); | |
883 | return rc; | |
884 | } | |
885 | } else | |
886 | *poffset += bytes_written; | |
887 | long_op = FALSE; /* subsequent writes fast - | |
888 | 15 seconds is plenty */ | |
889 | } | |
890 | ||
a4544347 | 891 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
892 | |
893 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
894 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
895 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
896 | /* Do not update local mtime - server will set its actual value on write |
897 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
898 | * current_fs_time(inode->i_sb);*/ |
899 | if (total_written > 0) { | |
900 | spin_lock(&inode->i_lock); | |
901 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
902 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 903 | *poffset); |
3677db10 | 904 | spin_unlock(&inode->i_lock); |
1da177e4 | 905 | } |
fb8c4b14 | 906 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
907 | } |
908 | FreeXid(xid); | |
909 | return total_written; | |
910 | } | |
911 | ||
912 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
913 | size_t write_size, loff_t *poffset) | |
914 | { | |
915 | int rc = 0; | |
916 | unsigned int bytes_written = 0; | |
917 | unsigned int total_written; | |
918 | struct cifs_sb_info *cifs_sb; | |
919 | struct cifsTconInfo *pTcon; | |
920 | int xid, long_op; | |
921 | struct cifsFileInfo *open_file; | |
922 | ||
e6a00296 | 923 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
924 | |
925 | pTcon = cifs_sb->tcon; | |
926 | ||
fb8c4b14 | 927 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 928 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
929 | |
930 | if (file->private_data == NULL) | |
931 | return -EBADF; | |
c33f8d32 | 932 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 933 | |
1da177e4 | 934 | xid = GetXid(); |
1da177e4 | 935 | |
e6a00296 | 936 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
1da177e4 LT |
937 | long_op = 2; /* writes past end of file can take a long time */ |
938 | else | |
939 | long_op = 1; | |
940 | ||
941 | for (total_written = 0; write_size > total_written; | |
942 | total_written += bytes_written) { | |
943 | rc = -EAGAIN; | |
944 | while (rc == -EAGAIN) { | |
945 | if (file->private_data == NULL) { | |
946 | /* file has been closed on us */ | |
947 | FreeXid(xid); | |
948 | /* if we have gotten here we have written some data | |
949 | and blocked, and the file has been freed on us | |
fb8c4b14 | 950 | while we blocked so return what we managed to |
1da177e4 LT |
951 | write */ |
952 | return total_written; | |
fb8c4b14 | 953 | } |
1da177e4 LT |
954 | if (open_file->closePend) { |
955 | FreeXid(xid); | |
956 | if (total_written) | |
957 | return total_written; | |
958 | else | |
959 | return -EBADF; | |
960 | } | |
961 | if (open_file->invalidHandle) { | |
1da177e4 LT |
962 | /* we could deadlock if we called |
963 | filemap_fdatawait from here so tell | |
fb8c4b14 | 964 | reopen_file not to flush data to |
1da177e4 | 965 | server now */ |
3a9f462f | 966 | rc = cifs_reopen_file(file, FALSE); |
1da177e4 LT |
967 | if (rc != 0) |
968 | break; | |
969 | } | |
fb8c4b14 SF |
970 | if (experimEnabled || (pTcon->ses->server && |
971 | ((pTcon->ses->server->secMode & | |
08775834 | 972 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 973 | == 0))) { |
3e84469d SF |
974 | struct kvec iov[2]; |
975 | unsigned int len; | |
976 | ||
0ae0efad | 977 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
978 | write_size - total_written); |
979 | /* iov[0] is reserved for smb header */ | |
980 | iov[1].iov_base = (char *)write_data + | |
981 | total_written; | |
982 | iov[1].iov_len = len; | |
d6e04ae6 | 983 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 984 | open_file->netfid, len, |
d6e04ae6 | 985 | *poffset, &bytes_written, |
3e84469d | 986 | iov, 1, long_op); |
d6e04ae6 | 987 | } else |
60808233 SF |
988 | rc = CIFSSMBWrite(xid, pTcon, |
989 | open_file->netfid, | |
990 | min_t(const int, cifs_sb->wsize, | |
991 | write_size - total_written), | |
992 | *poffset, &bytes_written, | |
993 | write_data + total_written, | |
994 | NULL, long_op); | |
1da177e4 LT |
995 | } |
996 | if (rc || (bytes_written == 0)) { | |
997 | if (total_written) | |
998 | break; | |
999 | else { | |
1000 | FreeXid(xid); | |
1001 | return rc; | |
1002 | } | |
1003 | } else | |
1004 | *poffset += bytes_written; | |
fb8c4b14 | 1005 | long_op = FALSE; /* subsequent writes fast - |
1da177e4 LT |
1006 | 15 seconds is plenty */ |
1007 | } | |
1008 | ||
a4544347 | 1009 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1010 | |
1011 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1012 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1013 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1014 | /* file->f_path.dentry->d_inode->i_ctime = |
1015 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1016 | if (total_written > 0) { | |
1017 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1018 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1019 | i_size_write(file->f_path.dentry->d_inode, | |
1020 | *poffset); | |
1021 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1022 | } |
3677db10 | 1023 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1024 | } |
1025 | FreeXid(xid); | |
1026 | return total_written; | |
1027 | } | |
1028 | ||
dd99cd80 | 1029 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1030 | { |
1031 | struct cifsFileInfo *open_file; | |
dd99cd80 | 1032 | int rc; |
6148a742 | 1033 | |
60808233 SF |
1034 | /* Having a null inode here (because mapping->host was set to zero by |
1035 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1036 | it being zero) during stress testcases so we need to check for it */ | |
1037 | ||
fb8c4b14 SF |
1038 | if (cifs_inode == NULL) { |
1039 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1040 | dump_stack(); |
1041 | return NULL; | |
1042 | } | |
1043 | ||
6148a742 | 1044 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1045 | refind_writable: |
6148a742 SF |
1046 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
1047 | if (open_file->closePend) | |
1048 | continue; | |
1049 | if (open_file->pfile && | |
1050 | ((open_file->pfile->f_flags & O_RDWR) || | |
1051 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1052 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1053 | |
1054 | if (!open_file->invalidHandle) { | |
1055 | /* found a good writable file */ | |
1056 | read_unlock(&GlobalSMBSeslock); | |
1057 | return open_file; | |
1058 | } | |
1059 | ||
6148a742 | 1060 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 SF |
1061 | /* Had to unlock since following call can block */ |
1062 | rc = cifs_reopen_file(open_file->pfile, FALSE); | |
1063 | if (!rc) { | |
1064 | if (!open_file->closePend) | |
1065 | return open_file; | |
1066 | else { /* start over in case this was deleted */ | |
1067 | /* since the list could be modified */ | |
37c0eb46 | 1068 | read_lock(&GlobalSMBSeslock); |
15745320 | 1069 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1070 | goto refind_writable; |
37c0eb46 SF |
1071 | } |
1072 | } | |
9b22b0b7 SF |
1073 | |
1074 | /* if it fails, try another handle if possible - | |
1075 | (we can not do this if closePending since | |
1076 | loop could be modified - in which case we | |
1077 | have to start at the beginning of the list | |
1078 | again. Note that it would be bad | |
1079 | to hold up writepages here (rather than | |
1080 | in caller) with continuous retries */ | |
1081 | cFYI(1, ("wp failed on reopen file")); | |
1082 | read_lock(&GlobalSMBSeslock); | |
1083 | /* can not use this handle, no write | |
1084 | pending on this one after all */ | |
1085 | atomic_dec(&open_file->wrtPending); | |
1086 | ||
1087 | if (open_file->closePend) /* list could have changed */ | |
1088 | goto refind_writable; | |
1089 | /* else we simply continue to the next entry. Thus | |
1090 | we do not loop on reopen errors. If we | |
1091 | can not reopen the file, for example if we | |
1092 | reconnected to a server with another client | |
1093 | racing to delete or lock the file we would not | |
1094 | make progress if we restarted before the beginning | |
1095 | of the loop here. */ | |
6148a742 SF |
1096 | } |
1097 | } | |
1098 | read_unlock(&GlobalSMBSeslock); | |
1099 | return NULL; | |
1100 | } | |
1101 | ||
1da177e4 LT |
1102 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1103 | { | |
1104 | struct address_space *mapping = page->mapping; | |
1105 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1106 | char *write_data; | |
1107 | int rc = -EFAULT; | |
1108 | int bytes_written = 0; | |
1109 | struct cifs_sb_info *cifs_sb; | |
1110 | struct cifsTconInfo *pTcon; | |
1111 | struct inode *inode; | |
6148a742 | 1112 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1113 | |
1114 | if (!mapping || !mapping->host) | |
1115 | return -EFAULT; | |
1116 | ||
1117 | inode = page->mapping->host; | |
1118 | cifs_sb = CIFS_SB(inode->i_sb); | |
1119 | pTcon = cifs_sb->tcon; | |
1120 | ||
1121 | offset += (loff_t)from; | |
1122 | write_data = kmap(page); | |
1123 | write_data += from; | |
1124 | ||
1125 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1126 | kunmap(page); | |
1127 | return -EIO; | |
1128 | } | |
1129 | ||
1130 | /* racing with truncate? */ | |
1131 | if (offset > mapping->host->i_size) { | |
1132 | kunmap(page); | |
1133 | return 0; /* don't care */ | |
1134 | } | |
1135 | ||
1136 | /* check to make sure that we are not extending the file */ | |
1137 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1138 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1139 | |
6148a742 SF |
1140 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1141 | if (open_file) { | |
1142 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1143 | to-from, &offset); | |
23e7dd7d | 1144 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1145 | /* Does mm or vfs already set times? */ |
6148a742 SF |
1146 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
1147 | if ((bytes_written > 0) && (offset)) { | |
1148 | rc = 0; | |
1149 | } else if (bytes_written < 0) { | |
1150 | if (rc != -EBADF) | |
1151 | rc = bytes_written; | |
1da177e4 | 1152 | } |
6148a742 | 1153 | } else { |
1da177e4 LT |
1154 | cFYI(1, ("No writeable filehandles for inode")); |
1155 | rc = -EIO; | |
1156 | } | |
1157 | ||
1158 | kunmap(page); | |
1159 | return rc; | |
1160 | } | |
1161 | ||
1da177e4 | 1162 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1163 | struct writeback_control *wbc) |
1da177e4 | 1164 | { |
37c0eb46 SF |
1165 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1166 | unsigned int bytes_to_write; | |
1167 | unsigned int bytes_written; | |
1168 | struct cifs_sb_info *cifs_sb; | |
1169 | int done = 0; | |
111ebb6e | 1170 | pgoff_t end; |
37c0eb46 | 1171 | pgoff_t index; |
fb8c4b14 SF |
1172 | int range_whole = 0; |
1173 | struct kvec *iov; | |
84d2f07e | 1174 | int len; |
37c0eb46 SF |
1175 | int n_iov = 0; |
1176 | pgoff_t next; | |
1177 | int nr_pages; | |
1178 | __u64 offset = 0; | |
23e7dd7d | 1179 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1180 | struct page *page; |
1181 | struct pagevec pvec; | |
1182 | int rc = 0; | |
1183 | int scanned = 0; | |
1da177e4 LT |
1184 | int xid; |
1185 | ||
37c0eb46 | 1186 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1187 | |
37c0eb46 SF |
1188 | /* |
1189 | * If wsize is smaller that the page cache size, default to writing | |
1190 | * one page at a time via cifs_writepage | |
1191 | */ | |
1192 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1193 | return generic_writepages(mapping, wbc); | |
1194 | ||
fb8c4b14 SF |
1195 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1196 | if (cifs_sb->tcon->ses->server->secMode & | |
1197 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1198 | if (!experimEnabled) | |
60808233 | 1199 | return generic_writepages(mapping, wbc); |
4a77118c | 1200 | |
9a0c8230 | 1201 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1202 | if (iov == NULL) |
9a0c8230 SF |
1203 | return generic_writepages(mapping, wbc); |
1204 | ||
1205 | ||
37c0eb46 SF |
1206 | /* |
1207 | * BB: Is this meaningful for a non-block-device file system? | |
1208 | * If it is, we should test it again after we do I/O | |
1209 | */ | |
1210 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1211 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1212 | kfree(iov); |
37c0eb46 SF |
1213 | return 0; |
1214 | } | |
1215 | ||
1da177e4 LT |
1216 | xid = GetXid(); |
1217 | ||
37c0eb46 | 1218 | pagevec_init(&pvec, 0); |
111ebb6e | 1219 | if (wbc->range_cyclic) { |
37c0eb46 | 1220 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1221 | end = -1; |
1222 | } else { | |
1223 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1224 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1225 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1226 | range_whole = 1; | |
37c0eb46 SF |
1227 | scanned = 1; |
1228 | } | |
1229 | retry: | |
1230 | while (!done && (index <= end) && | |
1231 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1232 | PAGECACHE_TAG_DIRTY, | |
1233 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1234 | int first; | |
1235 | unsigned int i; | |
1236 | ||
37c0eb46 SF |
1237 | first = -1; |
1238 | next = 0; | |
1239 | n_iov = 0; | |
1240 | bytes_to_write = 0; | |
1241 | ||
1242 | for (i = 0; i < nr_pages; i++) { | |
1243 | page = pvec.pages[i]; | |
1244 | /* | |
1245 | * At this point we hold neither mapping->tree_lock nor | |
1246 | * lock on the page itself: the page may be truncated or | |
1247 | * invalidated (changing page->mapping to NULL), or even | |
1248 | * swizzled back from swapper_space to tmpfs file | |
1249 | * mapping | |
1250 | */ | |
1251 | ||
1252 | if (first < 0) | |
1253 | lock_page(page); | |
1254 | else if (TestSetPageLocked(page)) | |
1255 | break; | |
1256 | ||
1257 | if (unlikely(page->mapping != mapping)) { | |
1258 | unlock_page(page); | |
1259 | break; | |
1260 | } | |
1261 | ||
111ebb6e | 1262 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1263 | done = 1; |
1264 | unlock_page(page); | |
1265 | break; | |
1266 | } | |
1267 | ||
1268 | if (next && (page->index != next)) { | |
1269 | /* Not next consecutive page */ | |
1270 | unlock_page(page); | |
1271 | break; | |
1272 | } | |
1273 | ||
1274 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1275 | wait_on_page_writeback(page); | |
1276 | ||
1277 | if (PageWriteback(page) || | |
cb876f45 | 1278 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1279 | unlock_page(page); |
1280 | break; | |
1281 | } | |
84d2f07e | 1282 | |
cb876f45 LT |
1283 | /* |
1284 | * This actually clears the dirty bit in the radix tree. | |
1285 | * See cifs_writepage() for more commentary. | |
1286 | */ | |
1287 | set_page_writeback(page); | |
1288 | ||
84d2f07e SF |
1289 | if (page_offset(page) >= mapping->host->i_size) { |
1290 | done = 1; | |
1291 | unlock_page(page); | |
cb876f45 | 1292 | end_page_writeback(page); |
84d2f07e SF |
1293 | break; |
1294 | } | |
1295 | ||
37c0eb46 SF |
1296 | /* |
1297 | * BB can we get rid of this? pages are held by pvec | |
1298 | */ | |
1299 | page_cache_get(page); | |
1300 | ||
84d2f07e SF |
1301 | len = min(mapping->host->i_size - page_offset(page), |
1302 | (loff_t)PAGE_CACHE_SIZE); | |
1303 | ||
37c0eb46 SF |
1304 | /* reserve iov[0] for the smb header */ |
1305 | n_iov++; | |
1306 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1307 | iov[n_iov].iov_len = len; |
1308 | bytes_to_write += len; | |
37c0eb46 SF |
1309 | |
1310 | if (first < 0) { | |
1311 | first = i; | |
1312 | offset = page_offset(page); | |
1313 | } | |
1314 | next = page->index + 1; | |
1315 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1316 | break; | |
1317 | } | |
1318 | if (n_iov) { | |
23e7dd7d SF |
1319 | /* Search for a writable handle every time we call |
1320 | * CIFSSMBWrite2. We can't rely on the last handle | |
1321 | * we used to still be valid | |
1322 | */ | |
1323 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1324 | if (!open_file) { | |
1325 | cERROR(1, ("No writable handles for inode")); | |
1326 | rc = -EBADF; | |
1047abc1 | 1327 | } else { |
23e7dd7d SF |
1328 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1329 | open_file->netfid, | |
1330 | bytes_to_write, offset, | |
1331 | &bytes_written, iov, n_iov, | |
1332 | 1); | |
1333 | atomic_dec(&open_file->wrtPending); | |
1334 | if (rc || bytes_written < bytes_to_write) { | |
63135e08 | 1335 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1336 | rc, bytes_written)); |
1337 | /* BB what if continued retry is | |
1338 | requested via mount flags? */ | |
1339 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1340 | } else { |
1341 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1342 | bytes_written); | |
1343 | } | |
37c0eb46 SF |
1344 | } |
1345 | for (i = 0; i < n_iov; i++) { | |
1346 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1347 | /* Should we also set page error on |
1348 | success rc but too little data written? */ | |
1349 | /* BB investigate retry logic on temporary | |
1350 | server crash cases and how recovery works | |
fb8c4b14 SF |
1351 | when page marked as error */ |
1352 | if (rc) | |
eb9bdaa3 | 1353 | SetPageError(page); |
37c0eb46 SF |
1354 | kunmap(page); |
1355 | unlock_page(page); | |
cb876f45 | 1356 | end_page_writeback(page); |
37c0eb46 SF |
1357 | page_cache_release(page); |
1358 | } | |
1359 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1360 | done = 1; | |
1361 | index = next; | |
1362 | } | |
1363 | pagevec_release(&pvec); | |
1364 | } | |
1365 | if (!scanned && !done) { | |
1366 | /* | |
1367 | * We hit the last page and there is more work to be done: wrap | |
1368 | * back to the start of the file | |
1369 | */ | |
1370 | scanned = 1; | |
1371 | index = 0; | |
1372 | goto retry; | |
1373 | } | |
111ebb6e | 1374 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1375 | mapping->writeback_index = index; |
1376 | ||
1da177e4 | 1377 | FreeXid(xid); |
9a0c8230 | 1378 | kfree(iov); |
1da177e4 LT |
1379 | return rc; |
1380 | } | |
1da177e4 | 1381 | |
fb8c4b14 | 1382 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1383 | { |
1384 | int rc = -EFAULT; | |
1385 | int xid; | |
1386 | ||
1387 | xid = GetXid(); | |
1388 | /* BB add check for wbc flags */ | |
1389 | page_cache_get(page); | |
fb8c4b14 | 1390 | if (!PageUptodate(page)) { |
1da177e4 LT |
1391 | cFYI(1, ("ppw - page not up to date")); |
1392 | } | |
cb876f45 LT |
1393 | |
1394 | /* | |
1395 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1396 | * | |
1397 | * A writepage() implementation always needs to do either this, | |
1398 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1399 | * the case of a failure. | |
1400 | * | |
1401 | * Just unlocking the page will cause the radix tree tag-bits | |
1402 | * to fail to update with the state of the page correctly. | |
1403 | */ | |
fb8c4b14 | 1404 | set_page_writeback(page); |
1da177e4 LT |
1405 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1406 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1407 | unlock_page(page); | |
cb876f45 LT |
1408 | end_page_writeback(page); |
1409 | page_cache_release(page); | |
1da177e4 LT |
1410 | FreeXid(xid); |
1411 | return rc; | |
1412 | } | |
1413 | ||
1414 | static int cifs_commit_write(struct file *file, struct page *page, | |
1415 | unsigned offset, unsigned to) | |
1416 | { | |
1417 | int xid; | |
1418 | int rc = 0; | |
1419 | struct inode *inode = page->mapping->host; | |
1420 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1421 | char *page_data; | |
1422 | ||
1423 | xid = GetXid(); | |
fb8c4b14 | 1424 | cFYI(1, ("commit write for page %p up to position %lld for %d", |
1da177e4 | 1425 | page, position, to)); |
3677db10 | 1426 | spin_lock(&inode->i_lock); |
1da177e4 LT |
1427 | if (position > inode->i_size) { |
1428 | i_size_write(inode, position); | |
1da177e4 | 1429 | } |
3677db10 | 1430 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
1431 | if (!PageUptodate(page)) { |
1432 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1433 | /* can not rely on (or let) writepage write this data */ | |
1434 | if (to < offset) { | |
1435 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1436 | offset, to)); | |
1437 | FreeXid(xid); | |
1438 | return rc; | |
1439 | } | |
1440 | /* this is probably better than directly calling | |
1441 | partialpage_write since in this function the file handle is | |
1442 | known which we might as well leverage */ | |
1443 | /* BB check if anything else missing out of ppw | |
1444 | such as updating last write time */ | |
1445 | page_data = kmap(page); | |
1446 | rc = cifs_write(file, page_data + offset, to-offset, | |
1447 | &position); | |
1448 | if (rc > 0) | |
1449 | rc = 0; | |
1450 | /* else if (rc < 0) should we set writebehind rc? */ | |
1451 | kunmap(page); | |
fb8c4b14 | 1452 | } else { |
1da177e4 LT |
1453 | set_page_dirty(page); |
1454 | } | |
1455 | ||
1456 | FreeXid(xid); | |
1457 | return rc; | |
1458 | } | |
1459 | ||
1460 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1461 | { | |
1462 | int xid; | |
1463 | int rc = 0; | |
e6a00296 | 1464 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1465 | |
1466 | xid = GetXid(); | |
1467 | ||
fb8c4b14 | 1468 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1469 | dentry->d_name.name, datasync)); |
50c2f753 | 1470 | |
1da177e4 LT |
1471 | rc = filemap_fdatawrite(inode->i_mapping); |
1472 | if (rc == 0) | |
1473 | CIFS_I(inode)->write_behind_rc = 0; | |
1474 | FreeXid(xid); | |
1475 | return rc; | |
1476 | } | |
1477 | ||
3978d717 | 1478 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1479 | { |
1480 | struct address_space *mapping; | |
1481 | struct inode *inode; | |
1482 | unsigned long index = page->index; | |
1483 | unsigned int rpages = 0; | |
1484 | int rc = 0; | |
1485 | ||
1486 | cFYI(1, ("sync page %p",page)); | |
1487 | mapping = page->mapping; | |
1488 | if (!mapping) | |
1489 | return 0; | |
1490 | inode = mapping->host; | |
1491 | if (!inode) | |
3978d717 | 1492 | return; */ |
1da177e4 | 1493 | |
fb8c4b14 | 1494 | /* fill in rpages then |
1da177e4 LT |
1495 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1496 | ||
26a21b98 | 1497 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1498 | |
3978d717 | 1499 | #if 0 |
1da177e4 LT |
1500 | if (rc < 0) |
1501 | return rc; | |
1502 | return 0; | |
3978d717 | 1503 | #endif |
1da177e4 LT |
1504 | } */ |
1505 | ||
1506 | /* | |
1507 | * As file closes, flush all cached write data for this inode checking | |
1508 | * for write behind errors. | |
1509 | */ | |
75e1fcc0 | 1510 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1511 | { |
fb8c4b14 | 1512 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1513 | int rc = 0; |
1514 | ||
1515 | /* Rather than do the steps manually: | |
1516 | lock the inode for writing | |
1517 | loop through pages looking for write behind data (dirty pages) | |
1518 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1519 | send to server (prefer in parallel) | |
1520 | deal with writebehind errors | |
1521 | unlock inode for writing | |
1522 | filemapfdatawrite appears easier for the time being */ | |
1523 | ||
1524 | rc = filemap_fdatawrite(inode->i_mapping); | |
1525 | if (!rc) /* reset wb rc if we were able to write out dirty pages */ | |
1526 | CIFS_I(inode)->write_behind_rc = 0; | |
50c2f753 | 1527 | |
fb8c4b14 | 1528 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1529 | |
1530 | return rc; | |
1531 | } | |
1532 | ||
1533 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1534 | size_t read_size, loff_t *poffset) | |
1535 | { | |
1536 | int rc = -EACCES; | |
1537 | unsigned int bytes_read = 0; | |
1538 | unsigned int total_read = 0; | |
1539 | unsigned int current_read_size; | |
1540 | struct cifs_sb_info *cifs_sb; | |
1541 | struct cifsTconInfo *pTcon; | |
1542 | int xid; | |
1543 | struct cifsFileInfo *open_file; | |
1544 | char *smb_read_data; | |
1545 | char __user *current_offset; | |
1546 | struct smb_com_read_rsp *pSMBr; | |
1547 | ||
1548 | xid = GetXid(); | |
e6a00296 | 1549 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1550 | pTcon = cifs_sb->tcon; |
1551 | ||
1552 | if (file->private_data == NULL) { | |
1553 | FreeXid(xid); | |
1554 | return -EBADF; | |
1555 | } | |
1556 | open_file = (struct cifsFileInfo *)file->private_data; | |
1557 | ||
1558 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
1559 | cFYI(1, ("attempting read on write only file instance")); | |
1560 | } | |
1561 | for (total_read = 0, current_offset = read_data; | |
1562 | read_size > total_read; | |
1563 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1564 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1565 | cifs_sb->rsize); |
1566 | rc = -EAGAIN; | |
1567 | smb_read_data = NULL; | |
1568 | while (rc == -EAGAIN) { | |
ec637e3f | 1569 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1570 | if ((open_file->invalidHandle) && |
1da177e4 | 1571 | (!open_file->closePend)) { |
3a9f462f | 1572 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
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, &smb_read_data, | |
1580 | &buf_type); | |
1da177e4 | 1581 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1582 | if (smb_read_data) { |
93544cc6 SF |
1583 | if (copy_to_user(current_offset, |
1584 | smb_read_data + | |
1585 | 4 /* RFC1001 length field */ + | |
1586 | le16_to_cpu(pSMBr->DataOffset), | |
1587 | bytes_read)) { | |
1588 | rc = -EFAULT; | |
1589 | } | |
1590 | ||
fb8c4b14 | 1591 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1592 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1593 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1594 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1595 | smb_read_data = NULL; |
1596 | } | |
1597 | } | |
1598 | if (rc || (bytes_read == 0)) { | |
1599 | if (total_read) { | |
1600 | break; | |
1601 | } else { | |
1602 | FreeXid(xid); | |
1603 | return rc; | |
1604 | } | |
1605 | } else { | |
a4544347 | 1606 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1607 | *poffset += bytes_read; |
1608 | } | |
1609 | } | |
1610 | FreeXid(xid); | |
1611 | return total_read; | |
1612 | } | |
1613 | ||
1614 | ||
1615 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1616 | loff_t *poffset) | |
1617 | { | |
1618 | int rc = -EACCES; | |
1619 | unsigned int bytes_read = 0; | |
1620 | unsigned int total_read; | |
1621 | unsigned int current_read_size; | |
1622 | struct cifs_sb_info *cifs_sb; | |
1623 | struct cifsTconInfo *pTcon; | |
1624 | int xid; | |
1625 | char *current_offset; | |
1626 | struct cifsFileInfo *open_file; | |
ec637e3f | 1627 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1628 | |
1629 | xid = GetXid(); | |
e6a00296 | 1630 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1631 | pTcon = cifs_sb->tcon; |
1632 | ||
1633 | if (file->private_data == NULL) { | |
1634 | FreeXid(xid); | |
1635 | return -EBADF; | |
1636 | } | |
1637 | open_file = (struct cifsFileInfo *)file->private_data; | |
1638 | ||
1639 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1640 | cFYI(1, ("attempting read on write only file instance")); | |
1641 | ||
fb8c4b14 | 1642 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1643 | read_size > total_read; |
1644 | total_read += bytes_read, current_offset += bytes_read) { | |
1645 | current_read_size = min_t(const int, read_size - total_read, | |
1646 | cifs_sb->rsize); | |
f9f5c817 SF |
1647 | /* For windows me and 9x we do not want to request more |
1648 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1649 | if ((pTcon->ses) && |
f9f5c817 SF |
1650 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1651 | current_read_size = min_t(const int, current_read_size, | |
1652 | pTcon->ses->server->maxBuf - 128); | |
1653 | } | |
1da177e4 LT |
1654 | rc = -EAGAIN; |
1655 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1656 | if ((open_file->invalidHandle) && |
1da177e4 | 1657 | (!open_file->closePend)) { |
3a9f462f | 1658 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
1659 | if (rc != 0) |
1660 | break; | |
1661 | } | |
bfa0d75a | 1662 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1663 | open_file->netfid, |
1664 | current_read_size, *poffset, | |
1665 | &bytes_read, ¤t_offset, | |
1666 | &buf_type); | |
1da177e4 LT |
1667 | } |
1668 | if (rc || (bytes_read == 0)) { | |
1669 | if (total_read) { | |
1670 | break; | |
1671 | } else { | |
1672 | FreeXid(xid); | |
1673 | return rc; | |
1674 | } | |
1675 | } else { | |
a4544347 | 1676 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1677 | *poffset += bytes_read; |
1678 | } | |
1679 | } | |
1680 | FreeXid(xid); | |
1681 | return total_read; | |
1682 | } | |
1683 | ||
1684 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1685 | { | |
e6a00296 | 1686 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1687 | int rc, xid; |
1688 | ||
1689 | xid = GetXid(); | |
1690 | rc = cifs_revalidate(dentry); | |
1691 | if (rc) { | |
1692 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1693 | FreeXid(xid); | |
1694 | return rc; | |
1695 | } | |
1696 | rc = generic_file_mmap(file, vma); | |
1697 | FreeXid(xid); | |
1698 | return rc; | |
1699 | } | |
1700 | ||
1701 | ||
fb8c4b14 | 1702 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1703 | struct list_head *pages, int bytes_read, char *data, |
1704 | struct pagevec *plru_pvec) | |
1705 | { | |
1706 | struct page *page; | |
1707 | char *target; | |
1708 | ||
1709 | while (bytes_read > 0) { | |
1710 | if (list_empty(pages)) | |
1711 | break; | |
1712 | ||
1713 | page = list_entry(pages->prev, struct page, lru); | |
1714 | list_del(&page->lru); | |
1715 | ||
1716 | if (add_to_page_cache(page, mapping, page->index, | |
1717 | GFP_KERNEL)) { | |
1718 | page_cache_release(page); | |
1719 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1720 | data += PAGE_CACHE_SIZE; |
1721 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1722 | continue; |
1723 | } | |
1724 | ||
fb8c4b14 | 1725 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1726 | |
1727 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1728 | memcpy(target, data, bytes_read); | |
1729 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1730 | memset(target + bytes_read, 0, |
1da177e4 LT |
1731 | PAGE_CACHE_SIZE - bytes_read); |
1732 | bytes_read = 0; | |
1733 | } else { | |
1734 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1735 | bytes_read -= PAGE_CACHE_SIZE; | |
1736 | } | |
1737 | kunmap_atomic(target, KM_USER0); | |
1738 | ||
1739 | flush_dcache_page(page); | |
1740 | SetPageUptodate(page); | |
1741 | unlock_page(page); | |
1742 | if (!pagevec_add(plru_pvec, page)) | |
1743 | __pagevec_lru_add(plru_pvec); | |
1744 | data += PAGE_CACHE_SIZE; | |
1745 | } | |
1746 | return; | |
1747 | } | |
1748 | ||
1749 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1750 | struct list_head *page_list, unsigned num_pages) | |
1751 | { | |
1752 | int rc = -EACCES; | |
1753 | int xid; | |
1754 | loff_t offset; | |
1755 | struct page *page; | |
1756 | struct cifs_sb_info *cifs_sb; | |
1757 | struct cifsTconInfo *pTcon; | |
1758 | int bytes_read = 0; | |
fb8c4b14 | 1759 | unsigned int read_size, i; |
1da177e4 LT |
1760 | char *smb_read_data = NULL; |
1761 | struct smb_com_read_rsp *pSMBr; | |
1762 | struct pagevec lru_pvec; | |
1763 | struct cifsFileInfo *open_file; | |
ec637e3f | 1764 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1765 | |
1766 | xid = GetXid(); | |
1767 | if (file->private_data == NULL) { | |
1768 | FreeXid(xid); | |
1769 | return -EBADF; | |
1770 | } | |
1771 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1772 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1773 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1774 | |
1da177e4 | 1775 | pagevec_init(&lru_pvec, 0); |
75865f8c | 1776 | #ifdef CONFIG_CIFS_DEBUG2 |
fb8c4b14 SF |
1777 | cFYI(1, ("rpages: num pages %d", num_pages)); |
1778 | #endif | |
1da177e4 LT |
1779 | for (i = 0; i < num_pages; ) { |
1780 | unsigned contig_pages; | |
1781 | struct page *tmp_page; | |
1782 | unsigned long expected_index; | |
1783 | ||
1784 | if (list_empty(page_list)) | |
1785 | break; | |
1786 | ||
1787 | page = list_entry(page_list->prev, struct page, lru); | |
1788 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1789 | ||
1790 | /* count adjacent pages that we will read into */ | |
1791 | contig_pages = 0; | |
fb8c4b14 | 1792 | expected_index = |
1da177e4 | 1793 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1794 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1795 | if (tmp_page->index == expected_index) { |
1796 | contig_pages++; | |
1797 | expected_index++; | |
1798 | } else | |
fb8c4b14 | 1799 | break; |
1da177e4 LT |
1800 | } |
1801 | if (contig_pages + i > num_pages) | |
1802 | contig_pages = num_pages - i; | |
1803 | ||
1804 | /* for reads over a certain size could initiate async | |
1805 | read ahead */ | |
1806 | ||
1807 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1808 | /* Read size needs to be in multiples of one page */ | |
1809 | read_size = min_t(const unsigned int, read_size, | |
1810 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
75865f8c | 1811 | #ifdef CONFIG_CIFS_DEBUG2 |
fb8c4b14 | 1812 | cFYI(1, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 1813 | read_size, contig_pages)); |
fb8c4b14 | 1814 | #endif |
1da177e4 LT |
1815 | rc = -EAGAIN; |
1816 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1817 | if ((open_file->invalidHandle) && |
1da177e4 | 1818 | (!open_file->closePend)) { |
3a9f462f | 1819 | rc = cifs_reopen_file(file, TRUE); |
1da177e4 LT |
1820 | if (rc != 0) |
1821 | break; | |
1822 | } | |
1823 | ||
bfa0d75a | 1824 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1825 | open_file->netfid, |
1826 | read_size, offset, | |
1827 | &bytes_read, &smb_read_data, | |
1828 | &buf_type); | |
a9d02ad4 | 1829 | /* BB more RC checks ? */ |
fb8c4b14 | 1830 | if (rc == -EAGAIN) { |
1da177e4 | 1831 | if (smb_read_data) { |
fb8c4b14 | 1832 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1833 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1834 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1835 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1836 | smb_read_data = NULL; |
1837 | } | |
1838 | } | |
1839 | } | |
1840 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1841 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1842 | break; |
1843 | } else if (bytes_read > 0) { | |
6f88cc2e | 1844 | task_io_account_read(bytes_read); |
1da177e4 LT |
1845 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1846 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1847 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1848 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1849 | ||
1850 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1851 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1852 | if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1853 | i++; /* account for partial page */ | |
1854 | ||
fb8c4b14 | 1855 | /* server copy of file can have smaller size |
1da177e4 | 1856 | than client */ |
fb8c4b14 SF |
1857 | /* BB do we need to verify this common case ? |
1858 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1859 | we will hit it on next read */ |
1860 | ||
05ac9d4b | 1861 | /* break; */ |
1da177e4 LT |
1862 | } |
1863 | } else { | |
1864 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1865 | "Cleaning remaining pages from readahead list", | |
1866 | bytes_read, offset)); | |
fb8c4b14 | 1867 | /* BB turn off caching and do new lookup on |
1da177e4 | 1868 | file size at server? */ |
1da177e4 LT |
1869 | break; |
1870 | } | |
1871 | if (smb_read_data) { | |
fb8c4b14 | 1872 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1873 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1874 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1875 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1876 | smb_read_data = NULL; |
1877 | } | |
1878 | bytes_read = 0; | |
1879 | } | |
1880 | ||
1881 | pagevec_lru_add(&lru_pvec); | |
1882 | ||
1883 | /* need to free smb_read_data buf before exit */ | |
1884 | if (smb_read_data) { | |
fb8c4b14 | 1885 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1886 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1887 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1888 | cifs_buf_release(smb_read_data); |
1da177e4 | 1889 | smb_read_data = NULL; |
fb8c4b14 | 1890 | } |
1da177e4 LT |
1891 | |
1892 | FreeXid(xid); | |
1893 | return rc; | |
1894 | } | |
1895 | ||
1896 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1897 | loff_t *poffset) | |
1898 | { | |
1899 | char *read_data; | |
1900 | int rc; | |
1901 | ||
1902 | page_cache_get(page); | |
1903 | read_data = kmap(page); | |
1904 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1905 | |
1da177e4 | 1906 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1907 | |
1da177e4 LT |
1908 | if (rc < 0) |
1909 | goto io_error; | |
1910 | else | |
fb8c4b14 SF |
1911 | cFYI(1, ("Bytes read %d", rc)); |
1912 | ||
e6a00296 JJS |
1913 | file->f_path.dentry->d_inode->i_atime = |
1914 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1915 | |
1da177e4 LT |
1916 | if (PAGE_CACHE_SIZE > rc) |
1917 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1918 | ||
1919 | flush_dcache_page(page); | |
1920 | SetPageUptodate(page); | |
1921 | rc = 0; | |
fb8c4b14 | 1922 | |
1da177e4 | 1923 | io_error: |
fb8c4b14 | 1924 | kunmap(page); |
1da177e4 LT |
1925 | page_cache_release(page); |
1926 | return rc; | |
1927 | } | |
1928 | ||
1929 | static int cifs_readpage(struct file *file, struct page *page) | |
1930 | { | |
1931 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1932 | int rc = -EACCES; | |
1933 | int xid; | |
1934 | ||
1935 | xid = GetXid(); | |
1936 | ||
1937 | if (file->private_data == NULL) { | |
1938 | FreeXid(xid); | |
1939 | return -EBADF; | |
1940 | } | |
1941 | ||
fb8c4b14 | 1942 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
1943 | page, (int)offset, (int)offset)); |
1944 | ||
1945 | rc = cifs_readpage_worker(file, page, &offset); | |
1946 | ||
1947 | unlock_page(page); | |
1948 | ||
1949 | FreeXid(xid); | |
1950 | return rc; | |
1951 | } | |
1952 | ||
a403a0a3 SF |
1953 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
1954 | { | |
1955 | struct cifsFileInfo *open_file; | |
1956 | ||
1957 | read_lock(&GlobalSMBSeslock); | |
1958 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1959 | if (open_file->closePend) | |
1960 | continue; | |
1961 | if (open_file->pfile && | |
1962 | ((open_file->pfile->f_flags & O_RDWR) || | |
1963 | (open_file->pfile->f_flags & O_WRONLY))) { | |
1964 | read_unlock(&GlobalSMBSeslock); | |
1965 | return 1; | |
1966 | } | |
1967 | } | |
1968 | read_unlock(&GlobalSMBSeslock); | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1da177e4 LT |
1972 | /* We do not want to update the file size from server for inodes |
1973 | open for write - to avoid races with writepage extending | |
1974 | the file - in the future we could consider allowing | |
fb8c4b14 | 1975 | refreshing the inode only on increases in the file size |
1da177e4 LT |
1976 | but this is tricky to do without racing with writebehind |
1977 | page caching in the current Linux kernel design */ | |
7ba52631 | 1978 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 1979 | { |
a403a0a3 SF |
1980 | if (!cifsInode) |
1981 | return 1; | |
50c2f753 | 1982 | |
a403a0a3 SF |
1983 | if (is_inode_writable(cifsInode)) { |
1984 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
1985 | struct cifs_sb_info *cifs_sb; |
1986 | ||
c32a0b68 SF |
1987 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
1988 | if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) { | |
fb8c4b14 | 1989 | /* since no page cache to corrupt on directio |
c32a0b68 SF |
1990 | we can change size safely */ |
1991 | return 1; | |
1992 | } | |
1993 | ||
fb8c4b14 | 1994 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
7ba52631 SF |
1995 | return 1; |
1996 | ||
6148a742 | 1997 | return 0; |
23e7dd7d | 1998 | } else |
6148a742 | 1999 | return 1; |
1da177e4 LT |
2000 | } |
2001 | ||
1da177e4 LT |
2002 | static int cifs_prepare_write(struct file *file, struct page *page, |
2003 | unsigned from, unsigned to) | |
2004 | { | |
2005 | int rc = 0; | |
8a236264 SF |
2006 | loff_t i_size; |
2007 | loff_t offset; | |
2008 | ||
fb8c4b14 | 2009 | cFYI(1, ("prepare write for page %p from %d to %d", page, from, to)); |
8a236264 SF |
2010 | if (PageUptodate(page)) |
2011 | return 0; | |
2012 | ||
2013 | /* If we are writing a full page it will be up to date, | |
2014 | no need to read from the server */ | |
2015 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { | |
2016 | SetPageUptodate(page); | |
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2021 | i_size = i_size_read(page->mapping->host); | |
2022 | ||
2023 | if ((offset >= i_size) || | |
2024 | ((from == 0) && (offset + to) >= i_size)) { | |
2025 | /* | |
2026 | * We don't need to read data beyond the end of the file. | |
2027 | * zero it, and set the page uptodate | |
2028 | */ | |
8803863a | 2029 | simple_prepare_write(file, page, from, to); |
8a236264 SF |
2030 | SetPageUptodate(page); |
2031 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1da177e4 | 2032 | /* might as well read a page, it is fast enough */ |
8a236264 SF |
2033 | rc = cifs_readpage_worker(file, page, &offset); |
2034 | } else { | |
2035 | /* we could try using another file handle if there is one - | |
2036 | but how would we lock it to prevent close of that handle | |
2037 | racing with this read? In any case | |
2038 | this will be written out by commit_write so is fine */ | |
1da177e4 LT |
2039 | } |
2040 | ||
fb8c4b14 SF |
2041 | /* we do not need to pass errors back |
2042 | e.g. if we do not have read access to the file | |
8a236264 SF |
2043 | because cifs_commit_write will do the right thing. -- shaggy */ |
2044 | ||
1da177e4 LT |
2045 | return 0; |
2046 | } | |
2047 | ||
f5e54d6e | 2048 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2049 | .readpage = cifs_readpage, |
2050 | .readpages = cifs_readpages, | |
2051 | .writepage = cifs_writepage, | |
37c0eb46 | 2052 | .writepages = cifs_writepages, |
1da177e4 LT |
2053 | .prepare_write = cifs_prepare_write, |
2054 | .commit_write = cifs_commit_write, | |
2055 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2056 | /* .sync_page = cifs_sync_page, */ | |
2057 | /* .direct_IO = */ | |
2058 | }; | |
273d81d6 DK |
2059 | |
2060 | /* | |
2061 | * cifs_readpages requires the server to support a buffer large enough to | |
2062 | * contain the header plus one complete page of data. Otherwise, we need | |
2063 | * to leave cifs_readpages out of the address space operations. | |
2064 | */ | |
f5e54d6e | 2065 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2066 | .readpage = cifs_readpage, |
2067 | .writepage = cifs_writepage, | |
2068 | .writepages = cifs_writepages, | |
2069 | .prepare_write = cifs_prepare_write, | |
2070 | .commit_write = cifs_commit_write, | |
2071 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2072 | /* .sync_page = cifs_sync_page, */ | |
2073 | /* .direct_IO = */ | |
2074 | }; |