]>
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; | |
4b18f2a9 SF |
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 | ||
e10f7b55 JL |
78 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
79 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
80 | FILE_READ_DATA); | |
81 | ||
82 | ||
1da177e4 LT |
83 | } |
84 | ||
85 | static inline int cifs_get_disposition(unsigned int flags) | |
86 | { | |
87 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
88 | return FILE_CREATE; | |
89 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
90 | return FILE_OVERWRITE_IF; | |
91 | else if ((flags & O_CREAT) == O_CREAT) | |
92 | return FILE_OPEN_IF; | |
55aa2e09 SF |
93 | else if ((flags & O_TRUNC) == O_TRUNC) |
94 | return FILE_OVERWRITE; | |
1da177e4 LT |
95 | else |
96 | return FILE_OPEN; | |
97 | } | |
98 | ||
99 | /* all arguments to this function must be checked for validity in caller */ | |
100 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
101 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
102 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
103 | char *full_path, int xid) | |
104 | { | |
105 | struct timespec temp; | |
106 | int rc; | |
107 | ||
108 | /* want handles we can use to read with first | |
109 | in the list so we do not have to walk the | |
110 | list to search for one in prepare_write */ | |
111 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
fb8c4b14 | 112 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
113 | &pCifsInode->openFileList); |
114 | } else { | |
115 | list_add(&pCifsFile->flist, | |
116 | &pCifsInode->openFileList); | |
117 | } | |
118 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
119 | if (pCifsInode->clientCanCacheRead) { |
120 | /* we have the inode open somewhere else | |
121 | no need to discard cache data */ | |
122 | goto client_can_cache; | |
123 | } | |
124 | ||
125 | /* BB need same check in cifs_create too? */ | |
126 | /* if not oplocked, invalidate inode pages if mtime or file | |
127 | size changed */ | |
128 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
129 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
130 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
131 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
132 | cFYI(1, ("inode unchanged on server")); | |
133 | } else { | |
e6a00296 | 134 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
135 | /* BB no need to lock inode until after invalidate |
136 | since namei code should already have it locked? */ | |
cea21805 JL |
137 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
138 | if (rc != 0) | |
139 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
140 | } |
141 | cFYI(1, ("invalidating remote inode since open detected it " | |
142 | "changed")); | |
e6a00296 | 143 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
144 | } |
145 | ||
146 | client_can_cache: | |
c18c842b | 147 | if (pTcon->unix_ext) |
e6a00296 | 148 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
149 | full_path, inode->i_sb, xid); |
150 | else | |
e6a00296 | 151 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 152 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
153 | |
154 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
155 | pCifsInode->clientCanCacheAll = true; |
156 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 157 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 158 | file->f_path.dentry->d_inode)); |
1da177e4 | 159 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 160 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
161 | |
162 | return rc; | |
163 | } | |
164 | ||
165 | int cifs_open(struct inode *inode, struct file *file) | |
166 | { | |
167 | int rc = -EACCES; | |
168 | int xid, oplock; | |
169 | struct cifs_sb_info *cifs_sb; | |
170 | struct cifsTconInfo *pTcon; | |
171 | struct cifsFileInfo *pCifsFile; | |
172 | struct cifsInodeInfo *pCifsInode; | |
173 | struct list_head *tmp; | |
174 | char *full_path = NULL; | |
175 | int desiredAccess; | |
176 | int disposition; | |
177 | __u16 netfid; | |
178 | FILE_ALL_INFO *buf = NULL; | |
179 | ||
180 | xid = GetXid(); | |
181 | ||
182 | cifs_sb = CIFS_SB(inode->i_sb); | |
183 | pTcon = cifs_sb->tcon; | |
184 | ||
185 | if (file->f_flags & O_CREAT) { | |
186 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 187 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
188 | read_lock(&GlobalSMBSeslock); |
189 | list_for_each(tmp, &pCifsInode->openFileList) { | |
190 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
191 | flist); | |
192 | if ((pCifsFile->pfile == NULL) && | |
193 | (pCifsFile->pid == current->tgid)) { | |
194 | /* mode set in cifs_create */ | |
195 | ||
196 | /* needed for writepage */ | |
197 | pCifsFile->pfile = file; | |
50c2f753 | 198 | |
1da177e4 LT |
199 | file->private_data = pCifsFile; |
200 | break; | |
201 | } | |
202 | } | |
203 | read_unlock(&GlobalSMBSeslock); | |
204 | if (file->private_data != NULL) { | |
205 | rc = 0; | |
206 | FreeXid(xid); | |
207 | return rc; | |
208 | } else { | |
209 | if (file->f_flags & O_EXCL) | |
210 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 211 | "new file %p", file)); |
1da177e4 LT |
212 | } |
213 | } | |
214 | ||
e6a00296 | 215 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
216 | if (full_path == NULL) { |
217 | FreeXid(xid); | |
218 | return -ENOMEM; | |
219 | } | |
220 | ||
7521a3c5 | 221 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 LT |
222 | inode, file->f_flags, full_path)); |
223 | desiredAccess = cifs_convert_flags(file->f_flags); | |
224 | ||
225 | /********************************************************************* | |
226 | * open flag mapping table: | |
fb8c4b14 | 227 | * |
1da177e4 | 228 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 229 | * ---------- ---------------- |
1da177e4 LT |
230 | * O_CREAT FILE_OPEN_IF |
231 | * O_CREAT | O_EXCL FILE_CREATE | |
232 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
233 | * O_TRUNC FILE_OVERWRITE | |
234 | * none of the above FILE_OPEN | |
235 | * | |
236 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 237 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
238 | * O_CREAT | O_TRUNC is similar but truncates the existing |
239 | * file rather than creating a new file as FILE_SUPERSEDE does | |
240 | * (which uses the attributes / metadata passed in on open call) | |
241 | *? | |
fb8c4b14 | 242 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
243 | *? and the read write flags match reasonably. O_LARGEFILE |
244 | *? is irrelevant because largefile support is always used | |
245 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
246 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
247 | *********************************************************************/ | |
248 | ||
249 | disposition = cifs_get_disposition(file->f_flags); | |
250 | ||
251 | if (oplockEnabled) | |
252 | oplock = REQ_OPLOCK; | |
253 | else | |
4b18f2a9 | 254 | oplock = 0; |
1da177e4 LT |
255 | |
256 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
257 | ||
258 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
259 | and calling get_inode_info with returned buf (at least helps | |
260 | non-Unix server case) */ | |
261 | ||
fb8c4b14 SF |
262 | /* BB we can not do this if this is the second open of a file |
263 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
264 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
265 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
266 | if (!buf) { | |
267 | rc = -ENOMEM; | |
268 | goto out; | |
269 | } | |
5bafd765 SF |
270 | |
271 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
fb8c4b14 | 272 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, |
5bafd765 | 273 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
274 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
275 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
276 | else |
277 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
278 | ||
a9d02ad4 SF |
279 | if (rc == -EIO) { |
280 | /* Old server, try legacy style OpenX */ | |
281 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
282 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
283 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
284 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
285 | } | |
1da177e4 | 286 | if (rc) { |
26a21b98 | 287 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
288 | goto out; |
289 | } | |
290 | file->private_data = | |
291 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
292 | if (file->private_data == NULL) { | |
293 | rc = -ENOMEM; | |
294 | goto out; | |
295 | } | |
296 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 LT |
297 | write_lock(&GlobalSMBSeslock); |
298 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
299 | ||
e6a00296 | 300 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
301 | if (pCifsInode) { |
302 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
303 | pCifsFile, pTcon, | |
304 | &oplock, buf, full_path, xid); | |
305 | } else { | |
306 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
307 | } |
308 | ||
fb8c4b14 | 309 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
310 | /* time to set mode which we can not set earlier due to |
311 | problems creating new read-only files */ | |
c18c842b | 312 | if (pTcon->unix_ext) { |
1da177e4 LT |
313 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, |
314 | inode->i_mode, | |
315 | (__u64)-1, (__u64)-1, 0 /* dev */, | |
737b758c | 316 | cifs_sb->local_nls, |
fb8c4b14 | 317 | cifs_sb->mnt_cifs_flags & |
737b758c | 318 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
319 | } else { |
320 | /* BB implement via Windows security descriptors eg | |
321 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, | |
322 | -1, -1, local_nls); | |
323 | in the meantime could set r/o dos attribute when | |
324 | perms are eg: mode & 0222 == 0 */ | |
325 | } | |
326 | } | |
327 | ||
328 | out: | |
329 | kfree(buf); | |
330 | kfree(full_path); | |
331 | FreeXid(xid); | |
332 | return rc; | |
333 | } | |
334 | ||
0418726b | 335 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
336 | /* to server was lost */ |
337 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
338 | { | |
339 | int rc = 0; | |
340 | ||
341 | /* BB list all locks open on this file and relock */ | |
342 | ||
343 | return rc; | |
344 | } | |
345 | ||
4b18f2a9 | 346 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
347 | { |
348 | int rc = -EACCES; | |
349 | int xid, oplock; | |
350 | struct cifs_sb_info *cifs_sb; | |
351 | struct cifsTconInfo *pTcon; | |
352 | struct cifsFileInfo *pCifsFile; | |
353 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 354 | struct inode *inode; |
1da177e4 LT |
355 | char *full_path = NULL; |
356 | int desiredAccess; | |
357 | int disposition = FILE_OPEN; | |
358 | __u16 netfid; | |
359 | ||
ad7a2926 | 360 | if (file->private_data) |
1da177e4 | 361 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 362 | else |
1da177e4 LT |
363 | return -EBADF; |
364 | ||
365 | xid = GetXid(); | |
366 | down(&pCifsFile->fh_sem); | |
4b18f2a9 | 367 | if (!pCifsFile->invalidHandle) { |
1da177e4 LT |
368 | up(&pCifsFile->fh_sem); |
369 | FreeXid(xid); | |
370 | return 0; | |
371 | } | |
372 | ||
e6a00296 | 373 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
374 | cERROR(1, ("no valid name if dentry freed")); |
375 | dump_stack(); | |
376 | rc = -EBADF; | |
377 | goto reopen_error_exit; | |
378 | } | |
379 | ||
380 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 381 | if (inode == NULL) { |
3a9f462f SF |
382 | cERROR(1, ("inode not valid")); |
383 | dump_stack(); | |
384 | rc = -EBADF; | |
385 | goto reopen_error_exit; | |
1da177e4 | 386 | } |
50c2f753 | 387 | |
1da177e4 LT |
388 | cifs_sb = CIFS_SB(inode->i_sb); |
389 | pTcon = cifs_sb->tcon; | |
3a9f462f | 390 | |
1da177e4 LT |
391 | /* can not grab rename sem here because various ops, including |
392 | those that already have the rename sem can end up causing writepage | |
393 | to get called and if the server was down that means we end up here, | |
394 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 395 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 396 | if (full_path == NULL) { |
3a9f462f SF |
397 | rc = -ENOMEM; |
398 | reopen_error_exit: | |
1da177e4 LT |
399 | up(&pCifsFile->fh_sem); |
400 | FreeXid(xid); | |
3a9f462f | 401 | return rc; |
1da177e4 LT |
402 | } |
403 | ||
3a9f462f | 404 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 405 | inode, file->f_flags, full_path)); |
1da177e4 LT |
406 | desiredAccess = cifs_convert_flags(file->f_flags); |
407 | ||
408 | if (oplockEnabled) | |
409 | oplock = REQ_OPLOCK; | |
410 | else | |
4b18f2a9 | 411 | oplock = 0; |
1da177e4 LT |
412 | |
413 | /* Can not refresh inode by passing in file_info buf to be returned | |
fb8c4b14 SF |
414 | by SMBOpen and then calling get_inode_info with returned buf |
415 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
416 | and server version of file size can be stale. If we knew for sure |
417 | that inode was not dirty locally we could do this */ | |
418 | ||
1da177e4 LT |
419 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, |
420 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
fb8c4b14 | 421 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 422 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
423 | if (rc) { |
424 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
425 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
426 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 LT |
427 | } else { |
428 | pCifsFile->netfid = netfid; | |
4b18f2a9 | 429 | pCifsFile->invalidHandle = false; |
1da177e4 LT |
430 | up(&pCifsFile->fh_sem); |
431 | pCifsInode = CIFS_I(inode); | |
432 | if (pCifsInode) { | |
433 | if (can_flush) { | |
cea21805 JL |
434 | rc = filemap_write_and_wait(inode->i_mapping); |
435 | if (rc != 0) | |
436 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
437 | /* temporarily disable caching while we |
438 | go to server to get inode info */ | |
4b18f2a9 SF |
439 | pCifsInode->clientCanCacheAll = false; |
440 | pCifsInode->clientCanCacheRead = false; | |
c18c842b | 441 | if (pTcon->unix_ext) |
1da177e4 LT |
442 | rc = cifs_get_inode_info_unix(&inode, |
443 | full_path, inode->i_sb, xid); | |
444 | else | |
445 | rc = cifs_get_inode_info(&inode, | |
446 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 447 | xid, NULL); |
1da177e4 LT |
448 | } /* else we are writing out data to server already |
449 | and could deadlock if we tried to flush data, and | |
450 | since we do not know if we have data that would | |
451 | invalidate the current end of file on the server | |
452 | we can not go to the server to get the new inod | |
453 | info */ | |
454 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
455 | pCifsInode->clientCanCacheAll = true; |
456 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 457 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 458 | file->f_path.dentry->d_inode)); |
1da177e4 | 459 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
460 | pCifsInode->clientCanCacheRead = true; |
461 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 462 | } else { |
4b18f2a9 SF |
463 | pCifsInode->clientCanCacheRead = false; |
464 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
465 | } |
466 | cifs_relock_file(pCifsFile); | |
467 | } | |
468 | } | |
469 | ||
470 | kfree(full_path); | |
471 | FreeXid(xid); | |
472 | return rc; | |
473 | } | |
474 | ||
475 | int cifs_close(struct inode *inode, struct file *file) | |
476 | { | |
477 | int rc = 0; | |
15745320 | 478 | int xid, timeout; |
1da177e4 LT |
479 | struct cifs_sb_info *cifs_sb; |
480 | struct cifsTconInfo *pTcon; | |
481 | struct cifsFileInfo *pSMBFile = | |
482 | (struct cifsFileInfo *)file->private_data; | |
483 | ||
484 | xid = GetXid(); | |
485 | ||
486 | cifs_sb = CIFS_SB(inode->i_sb); | |
487 | pTcon = cifs_sb->tcon; | |
488 | if (pSMBFile) { | |
7ee1af76 JA |
489 | struct cifsLockInfo *li, *tmp; |
490 | ||
4b18f2a9 | 491 | pSMBFile->closePend = true; |
1da177e4 LT |
492 | if (pTcon) { |
493 | /* no sense reconnecting to close a file that is | |
494 | already closed */ | |
495 | if (pTcon->tidStatus != CifsNeedReconnect) { | |
15745320 | 496 | timeout = 2; |
fb8c4b14 | 497 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 498 | && (timeout <= 2048)) { |
23e7dd7d SF |
499 | /* Give write a better chance to get to |
500 | server ahead of the close. We do not | |
501 | want to add a wait_q here as it would | |
502 | increase the memory utilization as | |
503 | the struct would be in each open file, | |
fb8c4b14 | 504 | but this should give enough time to |
23e7dd7d | 505 | clear the socket */ |
90c81e0b SF |
506 | cFYI(DBG2, |
507 | ("close delay, write pending")); | |
23e7dd7d SF |
508 | msleep(timeout); |
509 | timeout *= 4; | |
4891d539 | 510 | } |
fb8c4b14 | 511 | if (atomic_read(&pSMBFile->wrtPending)) |
63135e08 SF |
512 | cERROR(1, |
513 | ("close with pending writes")); | |
1da177e4 LT |
514 | rc = CIFSSMBClose(xid, pTcon, |
515 | pSMBFile->netfid); | |
1da177e4 LT |
516 | } |
517 | } | |
7ee1af76 JA |
518 | |
519 | /* Delete any outstanding lock records. | |
520 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 521 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
522 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
523 | list_del(&li->llist); | |
524 | kfree(li); | |
525 | } | |
796e5661 | 526 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 527 | |
cbe0476f | 528 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
529 | list_del(&pSMBFile->flist); |
530 | list_del(&pSMBFile->tlist); | |
cbe0476f | 531 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
532 | timeout = 10; |
533 | /* We waited above to give the SMBWrite a chance to issue | |
534 | on the wire (so we do not get SMBWrite returning EBADF | |
535 | if writepages is racing with close. Note that writepages | |
536 | does not specify a file handle, so it is possible for a file | |
537 | to be opened twice, and the application close the "wrong" | |
538 | file handle - in these cases we delay long enough to allow | |
539 | the SMBWrite to get on the wire before the SMB Close. | |
540 | We allow total wait here over 45 seconds, more than | |
541 | oplock break time, and more than enough to allow any write | |
542 | to complete on the server, or to time out on the client */ | |
543 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
544 | && (timeout <= 50000)) { | |
545 | cERROR(1, ("writes pending, delay free of handle")); | |
546 | msleep(timeout); | |
547 | timeout *= 8; | |
548 | } | |
1da177e4 LT |
549 | kfree(file->private_data); |
550 | file->private_data = NULL; | |
551 | } else | |
552 | rc = -EBADF; | |
553 | ||
4efa53f0 | 554 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
555 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
556 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
557 | /* if the file is not open we do not know if we can cache info | |
558 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
559 | CIFS_I(inode)->clientCanCacheRead = false; |
560 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 561 | } |
4efa53f0 | 562 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 563 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
564 | rc = CIFS_I(inode)->write_behind_rc; |
565 | FreeXid(xid); | |
566 | return rc; | |
567 | } | |
568 | ||
569 | int cifs_closedir(struct inode *inode, struct file *file) | |
570 | { | |
571 | int rc = 0; | |
572 | int xid; | |
573 | struct cifsFileInfo *pCFileStruct = | |
574 | (struct cifsFileInfo *)file->private_data; | |
575 | char *ptmp; | |
576 | ||
26a21b98 | 577 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
578 | |
579 | xid = GetXid(); | |
580 | ||
581 | if (pCFileStruct) { | |
582 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
583 | struct cifs_sb_info *cifs_sb = |
584 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
585 | |
586 | pTcon = cifs_sb->tcon; | |
587 | ||
588 | cFYI(1, ("Freeing private data in close dir")); | |
4b18f2a9 SF |
589 | if (!pCFileStruct->srch_inf.endOfSearch && |
590 | !pCFileStruct->invalidHandle) { | |
591 | pCFileStruct->invalidHandle = true; | |
1da177e4 LT |
592 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
593 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
594 | rc)); | |
595 | /* not much we can do if it fails anyway, ignore rc */ | |
596 | rc = 0; | |
597 | } | |
598 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; | |
599 | if (ptmp) { | |
ec637e3f | 600 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 601 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 602 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
603 | cifs_small_buf_release(ptmp); |
604 | else | |
605 | cifs_buf_release(ptmp); | |
1da177e4 | 606 | } |
1da177e4 LT |
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; | |
4b18f2a9 | 637 | bool wait_flag = false; |
1da177e4 LT |
638 | struct cifs_sb_info *cifs_sb; |
639 | struct cifsTconInfo *pTcon; | |
08547b03 SF |
640 | __u16 netfid; |
641 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
4b18f2a9 | 642 | bool 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")); |
4b18f2a9 | 659 | wait_flag = true; |
1da177e4 LT |
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 | 793 | li->length, li->offset, |
4b18f2a9 | 794 | 1, 0, li->type, false); |
7ee1af76 JA |
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) |
133672ef | 838 | long_op = CIFS_VLONG_OP; /* writes past EOF take long time */ |
1da177e4 | 839 | else |
133672ef | 840 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
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 */ | |
4b18f2a9 | 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; | |
133672ef | 887 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
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) |
133672ef | 937 | long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */ |
1da177e4 | 938 | else |
133672ef | 939 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
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 */ |
4b18f2a9 | 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; | |
133672ef | 1005 | long_op = CIFS_STD_OP; /* 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 | ||
630f3f0c SF |
1029 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1030 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1031 | { | |
1032 | struct cifsFileInfo *open_file = NULL; | |
1033 | ||
1034 | read_lock(&GlobalSMBSeslock); | |
1035 | /* we could simply get the first_list_entry since write-only entries | |
1036 | are always at the end of the list but since the first entry might | |
1037 | have a close pending, we go through the whole list */ | |
1038 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1039 | if (open_file->closePend) | |
1040 | continue; | |
1041 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1042 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1043 | if (!open_file->invalidHandle) { | |
1044 | /* found a good file */ | |
1045 | /* lock it so it will not be closed on us */ | |
1046 | atomic_inc(&open_file->wrtPending); | |
1047 | read_unlock(&GlobalSMBSeslock); | |
1048 | return open_file; | |
1049 | } /* else might as well continue, and look for | |
1050 | another, or simply have the caller reopen it | |
1051 | again rather than trying to fix this handle */ | |
1052 | } else /* write only file */ | |
1053 | break; /* write only files are last so must be done */ | |
1054 | } | |
1055 | read_unlock(&GlobalSMBSeslock); | |
1056 | return NULL; | |
1057 | } | |
1058 | #endif | |
1059 | ||
dd99cd80 | 1060 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1061 | { |
1062 | struct cifsFileInfo *open_file; | |
dd99cd80 | 1063 | int rc; |
6148a742 | 1064 | |
60808233 SF |
1065 | /* Having a null inode here (because mapping->host was set to zero by |
1066 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1067 | it being zero) during stress testcases so we need to check for it */ | |
1068 | ||
fb8c4b14 SF |
1069 | if (cifs_inode == NULL) { |
1070 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1071 | dump_stack(); |
1072 | return NULL; | |
1073 | } | |
1074 | ||
6148a742 | 1075 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1076 | refind_writable: |
6148a742 SF |
1077 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
1078 | if (open_file->closePend) | |
1079 | continue; | |
1080 | if (open_file->pfile && | |
1081 | ((open_file->pfile->f_flags & O_RDWR) || | |
1082 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1083 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1084 | |
1085 | if (!open_file->invalidHandle) { | |
1086 | /* found a good writable file */ | |
1087 | read_unlock(&GlobalSMBSeslock); | |
1088 | return open_file; | |
1089 | } | |
8840dee9 | 1090 | |
6148a742 | 1091 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1092 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1093 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1094 | if (!rc) { |
9b22b0b7 SF |
1095 | if (!open_file->closePend) |
1096 | return open_file; | |
1097 | else { /* start over in case this was deleted */ | |
1098 | /* since the list could be modified */ | |
37c0eb46 | 1099 | read_lock(&GlobalSMBSeslock); |
15745320 | 1100 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1101 | goto refind_writable; |
37c0eb46 SF |
1102 | } |
1103 | } | |
9b22b0b7 SF |
1104 | |
1105 | /* if it fails, try another handle if possible - | |
1106 | (we can not do this if closePending since | |
1107 | loop could be modified - in which case we | |
1108 | have to start at the beginning of the list | |
1109 | again. Note that it would be bad | |
1110 | to hold up writepages here (rather than | |
1111 | in caller) with continuous retries */ | |
1112 | cFYI(1, ("wp failed on reopen file")); | |
1113 | read_lock(&GlobalSMBSeslock); | |
1114 | /* can not use this handle, no write | |
1115 | pending on this one after all */ | |
1116 | atomic_dec(&open_file->wrtPending); | |
8840dee9 | 1117 | |
9b22b0b7 SF |
1118 | if (open_file->closePend) /* list could have changed */ |
1119 | goto refind_writable; | |
1120 | /* else we simply continue to the next entry. Thus | |
1121 | we do not loop on reopen errors. If we | |
1122 | can not reopen the file, for example if we | |
1123 | reconnected to a server with another client | |
1124 | racing to delete or lock the file we would not | |
1125 | make progress if we restarted before the beginning | |
1126 | of the loop here. */ | |
6148a742 SF |
1127 | } |
1128 | } | |
1129 | read_unlock(&GlobalSMBSeslock); | |
1130 | return NULL; | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1134 | { | |
1135 | struct address_space *mapping = page->mapping; | |
1136 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1137 | char *write_data; | |
1138 | int rc = -EFAULT; | |
1139 | int bytes_written = 0; | |
1140 | struct cifs_sb_info *cifs_sb; | |
1141 | struct cifsTconInfo *pTcon; | |
1142 | struct inode *inode; | |
6148a742 | 1143 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1144 | |
1145 | if (!mapping || !mapping->host) | |
1146 | return -EFAULT; | |
1147 | ||
1148 | inode = page->mapping->host; | |
1149 | cifs_sb = CIFS_SB(inode->i_sb); | |
1150 | pTcon = cifs_sb->tcon; | |
1151 | ||
1152 | offset += (loff_t)from; | |
1153 | write_data = kmap(page); | |
1154 | write_data += from; | |
1155 | ||
1156 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1157 | kunmap(page); | |
1158 | return -EIO; | |
1159 | } | |
1160 | ||
1161 | /* racing with truncate? */ | |
1162 | if (offset > mapping->host->i_size) { | |
1163 | kunmap(page); | |
1164 | return 0; /* don't care */ | |
1165 | } | |
1166 | ||
1167 | /* check to make sure that we are not extending the file */ | |
1168 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1169 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1170 | |
6148a742 SF |
1171 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1172 | if (open_file) { | |
1173 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1174 | to-from, &offset); | |
23e7dd7d | 1175 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1176 | /* Does mm or vfs already set times? */ |
6148a742 | 1177 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1178 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1179 | rc = 0; |
bb5a9a04 SF |
1180 | else if (bytes_written < 0) |
1181 | rc = bytes_written; | |
6148a742 | 1182 | } else { |
1da177e4 LT |
1183 | cFYI(1, ("No writeable filehandles for inode")); |
1184 | rc = -EIO; | |
1185 | } | |
1186 | ||
1187 | kunmap(page); | |
1188 | return rc; | |
1189 | } | |
1190 | ||
1da177e4 | 1191 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1192 | struct writeback_control *wbc) |
1da177e4 | 1193 | { |
37c0eb46 SF |
1194 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1195 | unsigned int bytes_to_write; | |
1196 | unsigned int bytes_written; | |
1197 | struct cifs_sb_info *cifs_sb; | |
1198 | int done = 0; | |
111ebb6e | 1199 | pgoff_t end; |
37c0eb46 | 1200 | pgoff_t index; |
fb8c4b14 SF |
1201 | int range_whole = 0; |
1202 | struct kvec *iov; | |
84d2f07e | 1203 | int len; |
37c0eb46 SF |
1204 | int n_iov = 0; |
1205 | pgoff_t next; | |
1206 | int nr_pages; | |
1207 | __u64 offset = 0; | |
23e7dd7d | 1208 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1209 | struct page *page; |
1210 | struct pagevec pvec; | |
1211 | int rc = 0; | |
1212 | int scanned = 0; | |
1da177e4 LT |
1213 | int xid; |
1214 | ||
37c0eb46 | 1215 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1216 | |
37c0eb46 SF |
1217 | /* |
1218 | * If wsize is smaller that the page cache size, default to writing | |
1219 | * one page at a time via cifs_writepage | |
1220 | */ | |
1221 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1222 | return generic_writepages(mapping, wbc); | |
1223 | ||
fb8c4b14 SF |
1224 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1225 | if (cifs_sb->tcon->ses->server->secMode & | |
1226 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1227 | if (!experimEnabled) | |
60808233 | 1228 | return generic_writepages(mapping, wbc); |
4a77118c | 1229 | |
9a0c8230 | 1230 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1231 | if (iov == NULL) |
9a0c8230 SF |
1232 | return generic_writepages(mapping, wbc); |
1233 | ||
1234 | ||
37c0eb46 SF |
1235 | /* |
1236 | * BB: Is this meaningful for a non-block-device file system? | |
1237 | * If it is, we should test it again after we do I/O | |
1238 | */ | |
1239 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1240 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1241 | kfree(iov); |
37c0eb46 SF |
1242 | return 0; |
1243 | } | |
1244 | ||
1da177e4 LT |
1245 | xid = GetXid(); |
1246 | ||
37c0eb46 | 1247 | pagevec_init(&pvec, 0); |
111ebb6e | 1248 | if (wbc->range_cyclic) { |
37c0eb46 | 1249 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1250 | end = -1; |
1251 | } else { | |
1252 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1253 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1254 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1255 | range_whole = 1; | |
37c0eb46 SF |
1256 | scanned = 1; |
1257 | } | |
1258 | retry: | |
1259 | while (!done && (index <= end) && | |
1260 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1261 | PAGECACHE_TAG_DIRTY, | |
1262 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1263 | int first; | |
1264 | unsigned int i; | |
1265 | ||
37c0eb46 SF |
1266 | first = -1; |
1267 | next = 0; | |
1268 | n_iov = 0; | |
1269 | bytes_to_write = 0; | |
1270 | ||
1271 | for (i = 0; i < nr_pages; i++) { | |
1272 | page = pvec.pages[i]; | |
1273 | /* | |
1274 | * At this point we hold neither mapping->tree_lock nor | |
1275 | * lock on the page itself: the page may be truncated or | |
1276 | * invalidated (changing page->mapping to NULL), or even | |
1277 | * swizzled back from swapper_space to tmpfs file | |
1278 | * mapping | |
1279 | */ | |
1280 | ||
1281 | if (first < 0) | |
1282 | lock_page(page); | |
1283 | else if (TestSetPageLocked(page)) | |
1284 | break; | |
1285 | ||
1286 | if (unlikely(page->mapping != mapping)) { | |
1287 | unlock_page(page); | |
1288 | break; | |
1289 | } | |
1290 | ||
111ebb6e | 1291 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1292 | done = 1; |
1293 | unlock_page(page); | |
1294 | break; | |
1295 | } | |
1296 | ||
1297 | if (next && (page->index != next)) { | |
1298 | /* Not next consecutive page */ | |
1299 | unlock_page(page); | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1304 | wait_on_page_writeback(page); | |
1305 | ||
1306 | if (PageWriteback(page) || | |
cb876f45 | 1307 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1308 | unlock_page(page); |
1309 | break; | |
1310 | } | |
84d2f07e | 1311 | |
cb876f45 LT |
1312 | /* |
1313 | * This actually clears the dirty bit in the radix tree. | |
1314 | * See cifs_writepage() for more commentary. | |
1315 | */ | |
1316 | set_page_writeback(page); | |
1317 | ||
84d2f07e SF |
1318 | if (page_offset(page) >= mapping->host->i_size) { |
1319 | done = 1; | |
1320 | unlock_page(page); | |
cb876f45 | 1321 | end_page_writeback(page); |
84d2f07e SF |
1322 | break; |
1323 | } | |
1324 | ||
37c0eb46 SF |
1325 | /* |
1326 | * BB can we get rid of this? pages are held by pvec | |
1327 | */ | |
1328 | page_cache_get(page); | |
1329 | ||
84d2f07e SF |
1330 | len = min(mapping->host->i_size - page_offset(page), |
1331 | (loff_t)PAGE_CACHE_SIZE); | |
1332 | ||
37c0eb46 SF |
1333 | /* reserve iov[0] for the smb header */ |
1334 | n_iov++; | |
1335 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1336 | iov[n_iov].iov_len = len; |
1337 | bytes_to_write += len; | |
37c0eb46 SF |
1338 | |
1339 | if (first < 0) { | |
1340 | first = i; | |
1341 | offset = page_offset(page); | |
1342 | } | |
1343 | next = page->index + 1; | |
1344 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1345 | break; | |
1346 | } | |
1347 | if (n_iov) { | |
23e7dd7d SF |
1348 | /* Search for a writable handle every time we call |
1349 | * CIFSSMBWrite2. We can't rely on the last handle | |
1350 | * we used to still be valid | |
1351 | */ | |
1352 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1353 | if (!open_file) { | |
1354 | cERROR(1, ("No writable handles for inode")); | |
1355 | rc = -EBADF; | |
1047abc1 | 1356 | } else { |
23e7dd7d SF |
1357 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1358 | open_file->netfid, | |
1359 | bytes_to_write, offset, | |
1360 | &bytes_written, iov, n_iov, | |
133672ef | 1361 | CIFS_LONG_OP); |
23e7dd7d SF |
1362 | atomic_dec(&open_file->wrtPending); |
1363 | if (rc || bytes_written < bytes_to_write) { | |
63135e08 | 1364 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1365 | rc, bytes_written)); |
1366 | /* BB what if continued retry is | |
1367 | requested via mount flags? */ | |
cea21805 JL |
1368 | if (rc == -ENOSPC) |
1369 | set_bit(AS_ENOSPC, &mapping->flags); | |
1370 | else | |
1371 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1372 | } else { |
1373 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1374 | bytes_written); | |
1375 | } | |
37c0eb46 SF |
1376 | } |
1377 | for (i = 0; i < n_iov; i++) { | |
1378 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1379 | /* Should we also set page error on |
1380 | success rc but too little data written? */ | |
1381 | /* BB investigate retry logic on temporary | |
1382 | server crash cases and how recovery works | |
fb8c4b14 SF |
1383 | when page marked as error */ |
1384 | if (rc) | |
eb9bdaa3 | 1385 | SetPageError(page); |
37c0eb46 SF |
1386 | kunmap(page); |
1387 | unlock_page(page); | |
cb876f45 | 1388 | end_page_writeback(page); |
37c0eb46 SF |
1389 | page_cache_release(page); |
1390 | } | |
1391 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1392 | done = 1; | |
1393 | index = next; | |
1394 | } | |
1395 | pagevec_release(&pvec); | |
1396 | } | |
1397 | if (!scanned && !done) { | |
1398 | /* | |
1399 | * We hit the last page and there is more work to be done: wrap | |
1400 | * back to the start of the file | |
1401 | */ | |
1402 | scanned = 1; | |
1403 | index = 0; | |
1404 | goto retry; | |
1405 | } | |
111ebb6e | 1406 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1407 | mapping->writeback_index = index; |
1408 | ||
1da177e4 | 1409 | FreeXid(xid); |
9a0c8230 | 1410 | kfree(iov); |
1da177e4 LT |
1411 | return rc; |
1412 | } | |
1da177e4 | 1413 | |
fb8c4b14 | 1414 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1415 | { |
1416 | int rc = -EFAULT; | |
1417 | int xid; | |
1418 | ||
1419 | xid = GetXid(); | |
1420 | /* BB add check for wbc flags */ | |
1421 | page_cache_get(page); | |
ad7a2926 | 1422 | if (!PageUptodate(page)) |
1da177e4 | 1423 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1424 | |
1425 | /* | |
1426 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1427 | * | |
1428 | * A writepage() implementation always needs to do either this, | |
1429 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1430 | * the case of a failure. | |
1431 | * | |
1432 | * Just unlocking the page will cause the radix tree tag-bits | |
1433 | * to fail to update with the state of the page correctly. | |
1434 | */ | |
fb8c4b14 | 1435 | set_page_writeback(page); |
1da177e4 LT |
1436 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1437 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1438 | unlock_page(page); | |
cb876f45 LT |
1439 | end_page_writeback(page); |
1440 | page_cache_release(page); | |
1da177e4 LT |
1441 | FreeXid(xid); |
1442 | return rc; | |
1443 | } | |
1444 | ||
1445 | static int cifs_commit_write(struct file *file, struct page *page, | |
1446 | unsigned offset, unsigned to) | |
1447 | { | |
1448 | int xid; | |
1449 | int rc = 0; | |
1450 | struct inode *inode = page->mapping->host; | |
1451 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1452 | char *page_data; | |
1453 | ||
1454 | xid = GetXid(); | |
fb8c4b14 | 1455 | cFYI(1, ("commit write for page %p up to position %lld for %d", |
1da177e4 | 1456 | page, position, to)); |
3677db10 | 1457 | spin_lock(&inode->i_lock); |
ad7a2926 | 1458 | if (position > inode->i_size) |
1da177e4 | 1459 | i_size_write(inode, position); |
ad7a2926 | 1460 | |
3677db10 | 1461 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
1462 | if (!PageUptodate(page)) { |
1463 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; | |
1464 | /* can not rely on (or let) writepage write this data */ | |
1465 | if (to < offset) { | |
1466 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", | |
1467 | offset, to)); | |
1468 | FreeXid(xid); | |
1469 | return rc; | |
1470 | } | |
1471 | /* this is probably better than directly calling | |
1472 | partialpage_write since in this function the file handle is | |
1473 | known which we might as well leverage */ | |
1474 | /* BB check if anything else missing out of ppw | |
1475 | such as updating last write time */ | |
1476 | page_data = kmap(page); | |
1477 | rc = cifs_write(file, page_data + offset, to-offset, | |
1478 | &position); | |
1479 | if (rc > 0) | |
1480 | rc = 0; | |
1481 | /* else if (rc < 0) should we set writebehind rc? */ | |
1482 | kunmap(page); | |
fb8c4b14 | 1483 | } else { |
1da177e4 LT |
1484 | set_page_dirty(page); |
1485 | } | |
1486 | ||
1487 | FreeXid(xid); | |
1488 | return rc; | |
1489 | } | |
1490 | ||
1491 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1492 | { | |
1493 | int xid; | |
1494 | int rc = 0; | |
e6a00296 | 1495 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1496 | |
1497 | xid = GetXid(); | |
1498 | ||
fb8c4b14 | 1499 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1500 | dentry->d_name.name, datasync)); |
50c2f753 | 1501 | |
cea21805 JL |
1502 | rc = filemap_write_and_wait(inode->i_mapping); |
1503 | if (rc == 0) { | |
1504 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1505 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1506 | } |
1da177e4 LT |
1507 | FreeXid(xid); |
1508 | return rc; | |
1509 | } | |
1510 | ||
3978d717 | 1511 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1512 | { |
1513 | struct address_space *mapping; | |
1514 | struct inode *inode; | |
1515 | unsigned long index = page->index; | |
1516 | unsigned int rpages = 0; | |
1517 | int rc = 0; | |
1518 | ||
1519 | cFYI(1, ("sync page %p",page)); | |
1520 | mapping = page->mapping; | |
1521 | if (!mapping) | |
1522 | return 0; | |
1523 | inode = mapping->host; | |
1524 | if (!inode) | |
3978d717 | 1525 | return; */ |
1da177e4 | 1526 | |
fb8c4b14 | 1527 | /* fill in rpages then |
1da177e4 LT |
1528 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1529 | ||
26a21b98 | 1530 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1531 | |
3978d717 | 1532 | #if 0 |
1da177e4 LT |
1533 | if (rc < 0) |
1534 | return rc; | |
1535 | return 0; | |
3978d717 | 1536 | #endif |
1da177e4 LT |
1537 | } */ |
1538 | ||
1539 | /* | |
1540 | * As file closes, flush all cached write data for this inode checking | |
1541 | * for write behind errors. | |
1542 | */ | |
75e1fcc0 | 1543 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1544 | { |
fb8c4b14 | 1545 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1546 | int rc = 0; |
1547 | ||
1548 | /* Rather than do the steps manually: | |
1549 | lock the inode for writing | |
1550 | loop through pages looking for write behind data (dirty pages) | |
1551 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1552 | send to server (prefer in parallel) | |
1553 | deal with writebehind errors | |
1554 | unlock inode for writing | |
1555 | filemapfdatawrite appears easier for the time being */ | |
1556 | ||
1557 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1558 | /* reset wb rc if we were able to write out dirty pages */ |
1559 | if (!rc) { | |
1560 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1561 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1562 | } |
50c2f753 | 1563 | |
fb8c4b14 | 1564 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1565 | |
1566 | return rc; | |
1567 | } | |
1568 | ||
1569 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1570 | size_t read_size, loff_t *poffset) | |
1571 | { | |
1572 | int rc = -EACCES; | |
1573 | unsigned int bytes_read = 0; | |
1574 | unsigned int total_read = 0; | |
1575 | unsigned int current_read_size; | |
1576 | struct cifs_sb_info *cifs_sb; | |
1577 | struct cifsTconInfo *pTcon; | |
1578 | int xid; | |
1579 | struct cifsFileInfo *open_file; | |
1580 | char *smb_read_data; | |
1581 | char __user *current_offset; | |
1582 | struct smb_com_read_rsp *pSMBr; | |
1583 | ||
1584 | xid = GetXid(); | |
e6a00296 | 1585 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1586 | pTcon = cifs_sb->tcon; |
1587 | ||
1588 | if (file->private_data == NULL) { | |
1589 | FreeXid(xid); | |
1590 | return -EBADF; | |
1591 | } | |
1592 | open_file = (struct cifsFileInfo *)file->private_data; | |
1593 | ||
ad7a2926 | 1594 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1595 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1596 | |
1da177e4 LT |
1597 | for (total_read = 0, current_offset = read_data; |
1598 | read_size > total_read; | |
1599 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1600 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1601 | cifs_sb->rsize); |
1602 | rc = -EAGAIN; | |
1603 | smb_read_data = NULL; | |
1604 | while (rc == -EAGAIN) { | |
ec637e3f | 1605 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1606 | if ((open_file->invalidHandle) && |
1da177e4 | 1607 | (!open_file->closePend)) { |
4b18f2a9 | 1608 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1609 | if (rc != 0) |
1610 | break; | |
1611 | } | |
bfa0d75a | 1612 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1613 | open_file->netfid, |
1614 | current_read_size, *poffset, | |
1615 | &bytes_read, &smb_read_data, | |
1616 | &buf_type); | |
1da177e4 | 1617 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1618 | if (smb_read_data) { |
93544cc6 SF |
1619 | if (copy_to_user(current_offset, |
1620 | smb_read_data + | |
1621 | 4 /* RFC1001 length field */ + | |
1622 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1623 | bytes_read)) |
93544cc6 | 1624 | rc = -EFAULT; |
93544cc6 | 1625 | |
fb8c4b14 | 1626 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1627 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1628 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1629 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1630 | smb_read_data = NULL; |
1631 | } | |
1632 | } | |
1633 | if (rc || (bytes_read == 0)) { | |
1634 | if (total_read) { | |
1635 | break; | |
1636 | } else { | |
1637 | FreeXid(xid); | |
1638 | return rc; | |
1639 | } | |
1640 | } else { | |
a4544347 | 1641 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1642 | *poffset += bytes_read; |
1643 | } | |
1644 | } | |
1645 | FreeXid(xid); | |
1646 | return total_read; | |
1647 | } | |
1648 | ||
1649 | ||
1650 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1651 | loff_t *poffset) | |
1652 | { | |
1653 | int rc = -EACCES; | |
1654 | unsigned int bytes_read = 0; | |
1655 | unsigned int total_read; | |
1656 | unsigned int current_read_size; | |
1657 | struct cifs_sb_info *cifs_sb; | |
1658 | struct cifsTconInfo *pTcon; | |
1659 | int xid; | |
1660 | char *current_offset; | |
1661 | struct cifsFileInfo *open_file; | |
ec637e3f | 1662 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1663 | |
1664 | xid = GetXid(); | |
e6a00296 | 1665 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1666 | pTcon = cifs_sb->tcon; |
1667 | ||
1668 | if (file->private_data == NULL) { | |
1669 | FreeXid(xid); | |
1670 | return -EBADF; | |
1671 | } | |
1672 | open_file = (struct cifsFileInfo *)file->private_data; | |
1673 | ||
1674 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1675 | cFYI(1, ("attempting read on write only file instance")); | |
1676 | ||
fb8c4b14 | 1677 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1678 | read_size > total_read; |
1679 | total_read += bytes_read, current_offset += bytes_read) { | |
1680 | current_read_size = min_t(const int, read_size - total_read, | |
1681 | cifs_sb->rsize); | |
f9f5c817 SF |
1682 | /* For windows me and 9x we do not want to request more |
1683 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1684 | if ((pTcon->ses) && |
f9f5c817 SF |
1685 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1686 | current_read_size = min_t(const int, current_read_size, | |
1687 | pTcon->ses->server->maxBuf - 128); | |
1688 | } | |
1da177e4 LT |
1689 | rc = -EAGAIN; |
1690 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1691 | if ((open_file->invalidHandle) && |
1da177e4 | 1692 | (!open_file->closePend)) { |
4b18f2a9 | 1693 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1694 | if (rc != 0) |
1695 | break; | |
1696 | } | |
bfa0d75a | 1697 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1698 | open_file->netfid, |
1699 | current_read_size, *poffset, | |
1700 | &bytes_read, ¤t_offset, | |
1701 | &buf_type); | |
1da177e4 LT |
1702 | } |
1703 | if (rc || (bytes_read == 0)) { | |
1704 | if (total_read) { | |
1705 | break; | |
1706 | } else { | |
1707 | FreeXid(xid); | |
1708 | return rc; | |
1709 | } | |
1710 | } else { | |
a4544347 | 1711 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1712 | *poffset += bytes_read; |
1713 | } | |
1714 | } | |
1715 | FreeXid(xid); | |
1716 | return total_read; | |
1717 | } | |
1718 | ||
1719 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1720 | { | |
e6a00296 | 1721 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1722 | int rc, xid; |
1723 | ||
1724 | xid = GetXid(); | |
1725 | rc = cifs_revalidate(dentry); | |
1726 | if (rc) { | |
1727 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1728 | FreeXid(xid); | |
1729 | return rc; | |
1730 | } | |
1731 | rc = generic_file_mmap(file, vma); | |
1732 | FreeXid(xid); | |
1733 | return rc; | |
1734 | } | |
1735 | ||
1736 | ||
fb8c4b14 | 1737 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1738 | struct list_head *pages, int bytes_read, char *data, |
1739 | struct pagevec *plru_pvec) | |
1740 | { | |
1741 | struct page *page; | |
1742 | char *target; | |
1743 | ||
1744 | while (bytes_read > 0) { | |
1745 | if (list_empty(pages)) | |
1746 | break; | |
1747 | ||
1748 | page = list_entry(pages->prev, struct page, lru); | |
1749 | list_del(&page->lru); | |
1750 | ||
1751 | if (add_to_page_cache(page, mapping, page->index, | |
1752 | GFP_KERNEL)) { | |
1753 | page_cache_release(page); | |
1754 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1755 | data += PAGE_CACHE_SIZE; |
1756 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1757 | continue; |
1758 | } | |
1759 | ||
fb8c4b14 | 1760 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1761 | |
1762 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1763 | memcpy(target, data, bytes_read); | |
1764 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1765 | memset(target + bytes_read, 0, |
1da177e4 LT |
1766 | PAGE_CACHE_SIZE - bytes_read); |
1767 | bytes_read = 0; | |
1768 | } else { | |
1769 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1770 | bytes_read -= PAGE_CACHE_SIZE; | |
1771 | } | |
1772 | kunmap_atomic(target, KM_USER0); | |
1773 | ||
1774 | flush_dcache_page(page); | |
1775 | SetPageUptodate(page); | |
1776 | unlock_page(page); | |
1777 | if (!pagevec_add(plru_pvec, page)) | |
1778 | __pagevec_lru_add(plru_pvec); | |
1779 | data += PAGE_CACHE_SIZE; | |
1780 | } | |
1781 | return; | |
1782 | } | |
1783 | ||
1784 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1785 | struct list_head *page_list, unsigned num_pages) | |
1786 | { | |
1787 | int rc = -EACCES; | |
1788 | int xid; | |
1789 | loff_t offset; | |
1790 | struct page *page; | |
1791 | struct cifs_sb_info *cifs_sb; | |
1792 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1793 | unsigned int bytes_read = 0; |
fb8c4b14 | 1794 | unsigned int read_size, i; |
1da177e4 LT |
1795 | char *smb_read_data = NULL; |
1796 | struct smb_com_read_rsp *pSMBr; | |
1797 | struct pagevec lru_pvec; | |
1798 | struct cifsFileInfo *open_file; | |
ec637e3f | 1799 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1800 | |
1801 | xid = GetXid(); | |
1802 | if (file->private_data == NULL) { | |
1803 | FreeXid(xid); | |
1804 | return -EBADF; | |
1805 | } | |
1806 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1807 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1808 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1809 | |
1da177e4 | 1810 | pagevec_init(&lru_pvec, 0); |
90c81e0b | 1811 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
1812 | for (i = 0; i < num_pages; ) { |
1813 | unsigned contig_pages; | |
1814 | struct page *tmp_page; | |
1815 | unsigned long expected_index; | |
1816 | ||
1817 | if (list_empty(page_list)) | |
1818 | break; | |
1819 | ||
1820 | page = list_entry(page_list->prev, struct page, lru); | |
1821 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1822 | ||
1823 | /* count adjacent pages that we will read into */ | |
1824 | contig_pages = 0; | |
fb8c4b14 | 1825 | expected_index = |
1da177e4 | 1826 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1827 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1828 | if (tmp_page->index == expected_index) { |
1829 | contig_pages++; | |
1830 | expected_index++; | |
1831 | } else | |
fb8c4b14 | 1832 | break; |
1da177e4 LT |
1833 | } |
1834 | if (contig_pages + i > num_pages) | |
1835 | contig_pages = num_pages - i; | |
1836 | ||
1837 | /* for reads over a certain size could initiate async | |
1838 | read ahead */ | |
1839 | ||
1840 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1841 | /* Read size needs to be in multiples of one page */ | |
1842 | read_size = min_t(const unsigned int, read_size, | |
1843 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 1844 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 1845 | read_size, contig_pages)); |
1da177e4 LT |
1846 | rc = -EAGAIN; |
1847 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1848 | if ((open_file->invalidHandle) && |
1da177e4 | 1849 | (!open_file->closePend)) { |
4b18f2a9 | 1850 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1851 | if (rc != 0) |
1852 | break; | |
1853 | } | |
1854 | ||
bfa0d75a | 1855 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1856 | open_file->netfid, |
1857 | read_size, offset, | |
1858 | &bytes_read, &smb_read_data, | |
1859 | &buf_type); | |
a9d02ad4 | 1860 | /* BB more RC checks ? */ |
fb8c4b14 | 1861 | if (rc == -EAGAIN) { |
1da177e4 | 1862 | if (smb_read_data) { |
fb8c4b14 | 1863 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1864 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1865 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1866 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1867 | smb_read_data = NULL; |
1868 | } | |
1869 | } | |
1870 | } | |
1871 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1872 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1873 | break; |
1874 | } else if (bytes_read > 0) { | |
6f88cc2e | 1875 | task_io_account_read(bytes_read); |
1da177e4 LT |
1876 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1877 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1878 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1879 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1880 | ||
1881 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1882 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1883 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1884 | i++; /* account for partial page */ |
1885 | ||
fb8c4b14 | 1886 | /* server copy of file can have smaller size |
1da177e4 | 1887 | than client */ |
fb8c4b14 SF |
1888 | /* BB do we need to verify this common case ? |
1889 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1890 | we will hit it on next read */ |
1891 | ||
05ac9d4b | 1892 | /* break; */ |
1da177e4 LT |
1893 | } |
1894 | } else { | |
1895 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1896 | "Cleaning remaining pages from readahead list", | |
1897 | bytes_read, offset)); | |
fb8c4b14 | 1898 | /* BB turn off caching and do new lookup on |
1da177e4 | 1899 | file size at server? */ |
1da177e4 LT |
1900 | break; |
1901 | } | |
1902 | if (smb_read_data) { | |
fb8c4b14 | 1903 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1904 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1905 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1906 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1907 | smb_read_data = NULL; |
1908 | } | |
1909 | bytes_read = 0; | |
1910 | } | |
1911 | ||
1912 | pagevec_lru_add(&lru_pvec); | |
1913 | ||
1914 | /* need to free smb_read_data buf before exit */ | |
1915 | if (smb_read_data) { | |
fb8c4b14 | 1916 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1917 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1918 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1919 | cifs_buf_release(smb_read_data); |
1da177e4 | 1920 | smb_read_data = NULL; |
fb8c4b14 | 1921 | } |
1da177e4 LT |
1922 | |
1923 | FreeXid(xid); | |
1924 | return rc; | |
1925 | } | |
1926 | ||
1927 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1928 | loff_t *poffset) | |
1929 | { | |
1930 | char *read_data; | |
1931 | int rc; | |
1932 | ||
1933 | page_cache_get(page); | |
1934 | read_data = kmap(page); | |
1935 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1936 | |
1da177e4 | 1937 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1938 | |
1da177e4 LT |
1939 | if (rc < 0) |
1940 | goto io_error; | |
1941 | else | |
fb8c4b14 SF |
1942 | cFYI(1, ("Bytes read %d", rc)); |
1943 | ||
e6a00296 JJS |
1944 | file->f_path.dentry->d_inode->i_atime = |
1945 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1946 | |
1da177e4 LT |
1947 | if (PAGE_CACHE_SIZE > rc) |
1948 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1949 | ||
1950 | flush_dcache_page(page); | |
1951 | SetPageUptodate(page); | |
1952 | rc = 0; | |
fb8c4b14 | 1953 | |
1da177e4 | 1954 | io_error: |
fb8c4b14 | 1955 | kunmap(page); |
1da177e4 LT |
1956 | page_cache_release(page); |
1957 | return rc; | |
1958 | } | |
1959 | ||
1960 | static int cifs_readpage(struct file *file, struct page *page) | |
1961 | { | |
1962 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1963 | int rc = -EACCES; | |
1964 | int xid; | |
1965 | ||
1966 | xid = GetXid(); | |
1967 | ||
1968 | if (file->private_data == NULL) { | |
1969 | FreeXid(xid); | |
1970 | return -EBADF; | |
1971 | } | |
1972 | ||
fb8c4b14 | 1973 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
1974 | page, (int)offset, (int)offset)); |
1975 | ||
1976 | rc = cifs_readpage_worker(file, page, &offset); | |
1977 | ||
1978 | unlock_page(page); | |
1979 | ||
1980 | FreeXid(xid); | |
1981 | return rc; | |
1982 | } | |
1983 | ||
a403a0a3 SF |
1984 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
1985 | { | |
1986 | struct cifsFileInfo *open_file; | |
1987 | ||
1988 | read_lock(&GlobalSMBSeslock); | |
1989 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1990 | if (open_file->closePend) | |
1991 | continue; | |
1992 | if (open_file->pfile && | |
1993 | ((open_file->pfile->f_flags & O_RDWR) || | |
1994 | (open_file->pfile->f_flags & O_WRONLY))) { | |
1995 | read_unlock(&GlobalSMBSeslock); | |
1996 | return 1; | |
1997 | } | |
1998 | } | |
1999 | read_unlock(&GlobalSMBSeslock); | |
2000 | return 0; | |
2001 | } | |
2002 | ||
1da177e4 LT |
2003 | /* We do not want to update the file size from server for inodes |
2004 | open for write - to avoid races with writepage extending | |
2005 | the file - in the future we could consider allowing | |
fb8c4b14 | 2006 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2007 | but this is tricky to do without racing with writebehind |
2008 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2009 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2010 | { |
a403a0a3 | 2011 | if (!cifsInode) |
4b18f2a9 | 2012 | return true; |
50c2f753 | 2013 | |
a403a0a3 SF |
2014 | if (is_inode_writable(cifsInode)) { |
2015 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2016 | struct cifs_sb_info *cifs_sb; |
2017 | ||
c32a0b68 | 2018 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2019 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2020 | /* since no page cache to corrupt on directio |
c32a0b68 | 2021 | we can change size safely */ |
4b18f2a9 | 2022 | return true; |
c32a0b68 SF |
2023 | } |
2024 | ||
fb8c4b14 | 2025 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2026 | return true; |
7ba52631 | 2027 | |
4b18f2a9 | 2028 | return false; |
23e7dd7d | 2029 | } else |
4b18f2a9 | 2030 | return true; |
1da177e4 LT |
2031 | } |
2032 | ||
1da177e4 LT |
2033 | static int cifs_prepare_write(struct file *file, struct page *page, |
2034 | unsigned from, unsigned to) | |
2035 | { | |
2036 | int rc = 0; | |
8a236264 SF |
2037 | loff_t i_size; |
2038 | loff_t offset; | |
2039 | ||
fb8c4b14 | 2040 | cFYI(1, ("prepare write for page %p from %d to %d", page, from, to)); |
8a236264 SF |
2041 | if (PageUptodate(page)) |
2042 | return 0; | |
2043 | ||
2044 | /* If we are writing a full page it will be up to date, | |
2045 | no need to read from the server */ | |
2046 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { | |
2047 | SetPageUptodate(page); | |
2048 | return 0; | |
2049 | } | |
2050 | ||
2051 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2052 | i_size = i_size_read(page->mapping->host); | |
2053 | ||
2054 | if ((offset >= i_size) || | |
2055 | ((from == 0) && (offset + to) >= i_size)) { | |
2056 | /* | |
2057 | * We don't need to read data beyond the end of the file. | |
2058 | * zero it, and set the page uptodate | |
2059 | */ | |
8803863a | 2060 | simple_prepare_write(file, page, from, to); |
8a236264 SF |
2061 | SetPageUptodate(page); |
2062 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { | |
1da177e4 | 2063 | /* might as well read a page, it is fast enough */ |
8a236264 SF |
2064 | rc = cifs_readpage_worker(file, page, &offset); |
2065 | } else { | |
2066 | /* we could try using another file handle if there is one - | |
2067 | but how would we lock it to prevent close of that handle | |
2068 | racing with this read? In any case | |
2069 | this will be written out by commit_write so is fine */ | |
1da177e4 LT |
2070 | } |
2071 | ||
fb8c4b14 SF |
2072 | /* we do not need to pass errors back |
2073 | e.g. if we do not have read access to the file | |
8a236264 SF |
2074 | because cifs_commit_write will do the right thing. -- shaggy */ |
2075 | ||
1da177e4 LT |
2076 | return 0; |
2077 | } | |
2078 | ||
f5e54d6e | 2079 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2080 | .readpage = cifs_readpage, |
2081 | .readpages = cifs_readpages, | |
2082 | .writepage = cifs_writepage, | |
37c0eb46 | 2083 | .writepages = cifs_writepages, |
1da177e4 LT |
2084 | .prepare_write = cifs_prepare_write, |
2085 | .commit_write = cifs_commit_write, | |
2086 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2087 | /* .sync_page = cifs_sync_page, */ | |
2088 | /* .direct_IO = */ | |
2089 | }; | |
273d81d6 DK |
2090 | |
2091 | /* | |
2092 | * cifs_readpages requires the server to support a buffer large enough to | |
2093 | * contain the header plus one complete page of data. Otherwise, we need | |
2094 | * to leave cifs_readpages out of the address space operations. | |
2095 | */ | |
f5e54d6e | 2096 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2097 | .readpage = cifs_readpage, |
2098 | .writepage = cifs_writepage, | |
2099 | .writepages = cifs_writepages, | |
2100 | .prepare_write = cifs_prepare_write, | |
2101 | .commit_write = cifs_commit_write, | |
2102 | .set_page_dirty = __set_page_dirty_nobuffers, | |
2103 | /* .sync_page = cifs_sync_page, */ | |
2104 | /* .direct_IO = */ | |
2105 | }; |