Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
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> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
608712fe | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 64 | { |
608712fe | 65 | u32 posix_flags = 0; |
e10f7b55 | 66 | |
7fc8f4e9 | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 68 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
70 | posix_flags = SMB_O_WRONLY; |
71 | else if ((flags & O_ACCMODE) == O_RDWR) | |
72 | posix_flags = SMB_O_RDWR; | |
73 | ||
74 | if (flags & O_CREAT) | |
75 | posix_flags |= SMB_O_CREAT; | |
76 | if (flags & O_EXCL) | |
77 | posix_flags |= SMB_O_EXCL; | |
78 | if (flags & O_TRUNC) | |
79 | posix_flags |= SMB_O_TRUNC; | |
80 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 81 | if (flags & O_DSYNC) |
608712fe | 82 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 83 | if (flags & O_DIRECTORY) |
608712fe | 84 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 85 | if (flags & O_NOFOLLOW) |
608712fe | 86 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 87 | if (flags & O_DIRECT) |
608712fe | 88 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
89 | |
90 | return posix_flags; | |
1da177e4 LT |
91 | } |
92 | ||
93 | static inline int cifs_get_disposition(unsigned int flags) | |
94 | { | |
95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
96 | return FILE_CREATE; | |
97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
98 | return FILE_OVERWRITE_IF; | |
99 | else if ((flags & O_CREAT) == O_CREAT) | |
100 | return FILE_OPEN_IF; | |
55aa2e09 SF |
101 | else if ((flags & O_TRUNC) == O_TRUNC) |
102 | return FILE_OVERWRITE; | |
1da177e4 LT |
103 | else |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
608712fe JL |
107 | int cifs_posix_open(char *full_path, struct inode **pinode, |
108 | struct super_block *sb, int mode, unsigned int f_flags, | |
109 | __u32 *poplock, __u16 *pnetfid, int xid) | |
110 | { | |
111 | int rc; | |
112 | FILE_UNIX_BASIC_INFO *presp_data; | |
113 | __u32 posix_flags = 0; | |
114 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
115 | struct cifs_fattr fattr; | |
116 | struct tcon_link *tlink; | |
117 | struct cifsTconInfo *tcon; | |
118 | ||
119 | cFYI(1, "posix open %s", full_path); | |
120 | ||
121 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
122 | if (presp_data == NULL) | |
123 | return -ENOMEM; | |
124 | ||
125 | tlink = cifs_sb_tlink(cifs_sb); | |
126 | if (IS_ERR(tlink)) { | |
127 | rc = PTR_ERR(tlink); | |
128 | goto posix_open_ret; | |
129 | } | |
130 | ||
131 | tcon = tlink_tcon(tlink); | |
132 | mode &= ~current_umask(); | |
133 | ||
134 | posix_flags = cifs_posix_convert_flags(f_flags); | |
135 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
136 | poplock, full_path, cifs_sb->local_nls, | |
137 | cifs_sb->mnt_cifs_flags & | |
138 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
139 | cifs_put_tlink(tlink); | |
140 | ||
141 | if (rc) | |
142 | goto posix_open_ret; | |
143 | ||
144 | if (presp_data->Type == cpu_to_le32(-1)) | |
145 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
146 | ||
147 | if (!pinode) | |
148 | goto posix_open_ret; /* caller does not need info */ | |
149 | ||
150 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
151 | ||
152 | /* get new inode and set it up */ | |
153 | if (*pinode == NULL) { | |
154 | cifs_fill_uniqueid(sb, &fattr); | |
155 | *pinode = cifs_iget(sb, &fattr); | |
156 | if (!*pinode) { | |
157 | rc = -ENOMEM; | |
158 | goto posix_open_ret; | |
159 | } | |
160 | } else { | |
161 | cifs_fattr_to_inode(*pinode, &fattr); | |
162 | } | |
163 | ||
164 | posix_open_ret: | |
165 | kfree(presp_data); | |
166 | return rc; | |
167 | } | |
168 | ||
eeb910a6 PS |
169 | static int |
170 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
171 | struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock, | |
172 | __u16 *pnetfid, int xid) | |
173 | { | |
174 | int rc; | |
175 | int desiredAccess; | |
176 | int disposition; | |
177 | FILE_ALL_INFO *buf; | |
178 | ||
179 | desiredAccess = cifs_convert_flags(f_flags); | |
180 | ||
181 | /********************************************************************* | |
182 | * open flag mapping table: | |
183 | * | |
184 | * POSIX Flag CIFS Disposition | |
185 | * ---------- ---------------- | |
186 | * O_CREAT FILE_OPEN_IF | |
187 | * O_CREAT | O_EXCL FILE_CREATE | |
188 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
189 | * O_TRUNC FILE_OVERWRITE | |
190 | * none of the above FILE_OPEN | |
191 | * | |
192 | * Note that there is not a direct match between disposition | |
193 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
194 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
195 | * file rather than creating a new file as FILE_SUPERSEDE does | |
196 | * (which uses the attributes / metadata passed in on open call) | |
197 | *? | |
198 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
199 | *? and the read write flags match reasonably. O_LARGEFILE | |
200 | *? is irrelevant because largefile support is always used | |
201 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
202 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
203 | *********************************************************************/ | |
204 | ||
205 | disposition = cifs_get_disposition(f_flags); | |
206 | ||
207 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
208 | ||
209 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
210 | if (!buf) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (tcon->ses->capabilities & CAP_NT_SMBS) | |
214 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
215 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
216 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
217 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
218 | else | |
219 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
220 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
223 | ||
224 | if (rc) | |
225 | goto out; | |
226 | ||
227 | if (tcon->unix_ext) | |
228 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
229 | xid); | |
230 | else | |
231 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
232 | xid, pnetfid); | |
233 | ||
234 | out: | |
235 | kfree(buf); | |
236 | return rc; | |
237 | } | |
238 | ||
15ecb436 JL |
239 | struct cifsFileInfo * |
240 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
241 | struct tcon_link *tlink, __u32 oplock) | |
242 | { | |
243 | struct dentry *dentry = file->f_path.dentry; | |
244 | struct inode *inode = dentry->d_inode; | |
245 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
246 | struct cifsFileInfo *pCifsFile; | |
247 | ||
248 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
249 | if (pCifsFile == NULL) | |
250 | return pCifsFile; | |
251 | ||
5f6dbc9e | 252 | pCifsFile->count = 1; |
15ecb436 JL |
253 | pCifsFile->netfid = fileHandle; |
254 | pCifsFile->pid = current->tgid; | |
255 | pCifsFile->uid = current_fsuid(); | |
256 | pCifsFile->dentry = dget(dentry); | |
257 | pCifsFile->f_flags = file->f_flags; | |
258 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
259 | pCifsFile->tlink = cifs_get_tlink(tlink); |
260 | mutex_init(&pCifsFile->fh_mutex); | |
261 | mutex_init(&pCifsFile->lock_mutex); | |
262 | INIT_LIST_HEAD(&pCifsFile->llist); | |
15ecb436 JL |
263 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
264 | ||
4477288a | 265 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
266 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
267 | /* if readable file instance put first in list*/ | |
268 | if (file->f_mode & FMODE_READ) | |
269 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
270 | else | |
271 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 272 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 273 | |
c6723628 | 274 | cifs_set_oplock_level(pCifsInode, oplock); |
15ecb436 JL |
275 | |
276 | file->private_data = pCifsFile; | |
277 | return pCifsFile; | |
278 | } | |
279 | ||
cdff08e7 SF |
280 | /* |
281 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
282 | * the filehandle out on the server. Must be called without holding |
283 | * cifs_file_list_lock. | |
cdff08e7 | 284 | */ |
b33879aa JL |
285 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
286 | { | |
e66673e3 | 287 | struct inode *inode = cifs_file->dentry->d_inode; |
cdff08e7 | 288 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 289 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 290 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
291 | struct cifsLockInfo *li, *tmp; |
292 | ||
293 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 294 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
295 | spin_unlock(&cifs_file_list_lock); |
296 | return; | |
297 | } | |
298 | ||
299 | /* remove it from the lists */ | |
300 | list_del(&cifs_file->flist); | |
301 | list_del(&cifs_file->tlist); | |
302 | ||
303 | if (list_empty(&cifsi->openFileList)) { | |
304 | cFYI(1, "closing last open instance for inode %p", | |
305 | cifs_file->dentry->d_inode); | |
4f8ba8a0 PS |
306 | |
307 | /* in strict cache mode we need invalidate mapping on the last | |
308 | close because it may cause a error when we open this file | |
309 | again and get at least level II oplock */ | |
310 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
311 | CIFS_I(inode)->invalid_mapping = true; | |
312 | ||
c6723628 | 313 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
314 | } |
315 | spin_unlock(&cifs_file_list_lock); | |
316 | ||
317 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { | |
318 | int xid, rc; | |
319 | ||
320 | xid = GetXid(); | |
321 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
322 | FreeXid(xid); | |
323 | } | |
324 | ||
325 | /* Delete any outstanding lock records. We'll lose them when the file | |
326 | * is closed anyway. | |
327 | */ | |
328 | mutex_lock(&cifs_file->lock_mutex); | |
329 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { | |
330 | list_del(&li->llist); | |
331 | kfree(li); | |
b33879aa | 332 | } |
cdff08e7 SF |
333 | mutex_unlock(&cifs_file->lock_mutex); |
334 | ||
335 | cifs_put_tlink(cifs_file->tlink); | |
336 | dput(cifs_file->dentry); | |
337 | kfree(cifs_file); | |
b33879aa JL |
338 | } |
339 | ||
1da177e4 LT |
340 | int cifs_open(struct inode *inode, struct file *file) |
341 | { | |
342 | int rc = -EACCES; | |
590a3fe0 JL |
343 | int xid; |
344 | __u32 oplock; | |
1da177e4 | 345 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 346 | struct cifsTconInfo *tcon; |
7ffec372 | 347 | struct tcon_link *tlink; |
6ca9f3ba | 348 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 349 | char *full_path = NULL; |
7e12eddb | 350 | bool posix_open_ok = false; |
1da177e4 | 351 | __u16 netfid; |
1da177e4 LT |
352 | |
353 | xid = GetXid(); | |
354 | ||
355 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
356 | tlink = cifs_sb_tlink(cifs_sb); |
357 | if (IS_ERR(tlink)) { | |
358 | FreeXid(xid); | |
359 | return PTR_ERR(tlink); | |
360 | } | |
361 | tcon = tlink_tcon(tlink); | |
1da177e4 | 362 | |
e6a00296 | 363 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 364 | if (full_path == NULL) { |
0f3bc09e | 365 | rc = -ENOMEM; |
232341ba | 366 | goto out; |
1da177e4 LT |
367 | } |
368 | ||
b6b38f70 JP |
369 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
370 | inode, file->f_flags, full_path); | |
276a74a4 SF |
371 | |
372 | if (oplockEnabled) | |
373 | oplock = REQ_OPLOCK; | |
374 | else | |
375 | oplock = 0; | |
376 | ||
64cc2c63 SF |
377 | if (!tcon->broken_posix_open && tcon->unix_ext && |
378 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
379 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
380 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 381 | /* can not refresh inode info since size could be stale */ |
2422f676 | 382 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 383 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 384 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 385 | if (rc == 0) { |
b6b38f70 | 386 | cFYI(1, "posix open succeeded"); |
7e12eddb | 387 | posix_open_ok = true; |
64cc2c63 SF |
388 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
389 | if (tcon->ses->serverNOS) | |
b6b38f70 | 390 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
391 | " unexpected error on SMB posix open" |
392 | ", disabling posix open support." | |
393 | " Check if server update available.", | |
394 | tcon->ses->serverName, | |
b6b38f70 | 395 | tcon->ses->serverNOS); |
64cc2c63 | 396 | tcon->broken_posix_open = true; |
276a74a4 SF |
397 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
398 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
399 | goto out; | |
64cc2c63 SF |
400 | /* else fallthrough to retry open the old way on network i/o |
401 | or DFS errors */ | |
276a74a4 SF |
402 | } |
403 | ||
7e12eddb PS |
404 | if (!posix_open_ok) { |
405 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
406 | file->f_flags, &oplock, &netfid, xid); | |
407 | if (rc) | |
408 | goto out; | |
409 | } | |
47c78b7f | 410 | |
abfe1eed | 411 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 412 | if (pCifsFile == NULL) { |
7e12eddb | 413 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
414 | rc = -ENOMEM; |
415 | goto out; | |
416 | } | |
1da177e4 | 417 | |
9451a9a5 SJ |
418 | cifs_fscache_set_inode_cookie(inode, file); |
419 | ||
7e12eddb | 420 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
421 | /* time to set mode which we can not set earlier due to |
422 | problems creating new read-only files */ | |
7e12eddb PS |
423 | struct cifs_unix_set_info_args args = { |
424 | .mode = inode->i_mode, | |
425 | .uid = NO_CHANGE_64, | |
426 | .gid = NO_CHANGE_64, | |
427 | .ctime = NO_CHANGE_64, | |
428 | .atime = NO_CHANGE_64, | |
429 | .mtime = NO_CHANGE_64, | |
430 | .device = 0, | |
431 | }; | |
d44a9fe2 JL |
432 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
433 | pCifsFile->pid); | |
1da177e4 LT |
434 | } |
435 | ||
436 | out: | |
1da177e4 LT |
437 | kfree(full_path); |
438 | FreeXid(xid); | |
7ffec372 | 439 | cifs_put_tlink(tlink); |
1da177e4 LT |
440 | return rc; |
441 | } | |
442 | ||
0418726b | 443 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
444 | /* to server was lost */ |
445 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
446 | { | |
447 | int rc = 0; | |
448 | ||
449 | /* BB list all locks open on this file and relock */ | |
450 | ||
451 | return rc; | |
452 | } | |
453 | ||
15886177 | 454 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
455 | { |
456 | int rc = -EACCES; | |
590a3fe0 JL |
457 | int xid; |
458 | __u32 oplock; | |
1da177e4 | 459 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 460 | struct cifsTconInfo *tcon; |
1da177e4 | 461 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 462 | struct inode *inode; |
1da177e4 LT |
463 | char *full_path = NULL; |
464 | int desiredAccess; | |
465 | int disposition = FILE_OPEN; | |
466 | __u16 netfid; | |
467 | ||
1da177e4 | 468 | xid = GetXid(); |
f0a71eb8 | 469 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 470 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 471 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 472 | rc = 0; |
1da177e4 | 473 | FreeXid(xid); |
0f3bc09e | 474 | return rc; |
1da177e4 LT |
475 | } |
476 | ||
15886177 | 477 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 478 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 479 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 480 | |
1da177e4 LT |
481 | /* can not grab rename sem here because various ops, including |
482 | those that already have the rename sem can end up causing writepage | |
483 | to get called and if the server was down that means we end up here, | |
484 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 485 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 486 | if (full_path == NULL) { |
3a9f462f | 487 | rc = -ENOMEM; |
f0a71eb8 | 488 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 489 | FreeXid(xid); |
3a9f462f | 490 | return rc; |
1da177e4 LT |
491 | } |
492 | ||
b6b38f70 | 493 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 494 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
495 | |
496 | if (oplockEnabled) | |
497 | oplock = REQ_OPLOCK; | |
498 | else | |
4b18f2a9 | 499 | oplock = 0; |
1da177e4 | 500 | |
7fc8f4e9 SF |
501 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
502 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
503 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
504 | |
505 | /* | |
506 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
507 | * original open. Must mask them off for a reopen. | |
508 | */ | |
15886177 JL |
509 | unsigned int oflags = pCifsFile->f_flags & |
510 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 511 | |
2422f676 | 512 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
513 | cifs_sb->mnt_file_mode /* ignored */, |
514 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 515 | if (rc == 0) { |
b6b38f70 | 516 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
517 | goto reopen_success; |
518 | } | |
519 | /* fallthrough to retry open the old way on errors, especially | |
520 | in the reconnect path it is important to retry hard */ | |
521 | } | |
522 | ||
15886177 | 523 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 524 | |
1da177e4 | 525 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
526 | by SMBOpen and then calling get_inode_info with returned buf |
527 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
528 | and server version of file size can be stale. If we knew for sure |
529 | that inode was not dirty locally we could do this */ | |
530 | ||
7fc8f4e9 | 531 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 532 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 533 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 534 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 535 | if (rc) { |
f0a71eb8 | 536 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
537 | cFYI(1, "cifs_open returned 0x%x", rc); |
538 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
539 | goto reopen_error_exit; |
540 | } | |
541 | ||
7fc8f4e9 | 542 | reopen_success: |
15886177 JL |
543 | pCifsFile->netfid = netfid; |
544 | pCifsFile->invalidHandle = false; | |
545 | mutex_unlock(&pCifsFile->fh_mutex); | |
546 | pCifsInode = CIFS_I(inode); | |
547 | ||
548 | if (can_flush) { | |
549 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 550 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 551 | |
15886177 JL |
552 | if (tcon->unix_ext) |
553 | rc = cifs_get_inode_info_unix(&inode, | |
554 | full_path, inode->i_sb, xid); | |
555 | else | |
556 | rc = cifs_get_inode_info(&inode, | |
557 | full_path, NULL, inode->i_sb, | |
558 | xid, NULL); | |
559 | } /* else we are writing out data to server already | |
560 | and could deadlock if we tried to flush data, and | |
561 | since we do not know if we have data that would | |
562 | invalidate the current end of file on the server | |
563 | we can not go to the server to get the new inod | |
564 | info */ | |
e66673e3 | 565 | |
c6723628 | 566 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 567 | |
15886177 JL |
568 | cifs_relock_file(pCifsFile); |
569 | ||
570 | reopen_error_exit: | |
1da177e4 LT |
571 | kfree(full_path); |
572 | FreeXid(xid); | |
573 | return rc; | |
574 | } | |
575 | ||
576 | int cifs_close(struct inode *inode, struct file *file) | |
577 | { | |
77970693 JL |
578 | if (file->private_data != NULL) { |
579 | cifsFileInfo_put(file->private_data); | |
580 | file->private_data = NULL; | |
581 | } | |
7ee1af76 | 582 | |
cdff08e7 SF |
583 | /* return code from the ->release op is always ignored */ |
584 | return 0; | |
1da177e4 LT |
585 | } |
586 | ||
587 | int cifs_closedir(struct inode *inode, struct file *file) | |
588 | { | |
589 | int rc = 0; | |
590 | int xid; | |
c21dfb69 | 591 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
592 | char *ptmp; |
593 | ||
b6b38f70 | 594 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
595 | |
596 | xid = GetXid(); | |
597 | ||
598 | if (pCFileStruct) { | |
13cfb733 | 599 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 600 | |
b6b38f70 | 601 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 602 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
603 | if (!pCFileStruct->srch_inf.endOfSearch && |
604 | !pCFileStruct->invalidHandle) { | |
605 | pCFileStruct->invalidHandle = true; | |
4477288a | 606 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 607 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
608 | cFYI(1, "Closing uncompleted readdir with rc %d", |
609 | rc); | |
1da177e4 LT |
610 | /* not much we can do if it fails anyway, ignore rc */ |
611 | rc = 0; | |
ddb4cbfc | 612 | } else |
4477288a | 613 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
614 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
615 | if (ptmp) { | |
b6b38f70 | 616 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 617 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 618 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
619 | cifs_small_buf_release(ptmp); |
620 | else | |
621 | cifs_buf_release(ptmp); | |
1da177e4 | 622 | } |
13cfb733 | 623 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
624 | kfree(file->private_data); |
625 | file->private_data = NULL; | |
626 | } | |
627 | /* BB can we lock the filestruct while this is going on? */ | |
628 | FreeXid(xid); | |
629 | return rc; | |
630 | } | |
631 | ||
7ee1af76 JA |
632 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
633 | __u64 offset, __u8 lockType) | |
634 | { | |
fb8c4b14 SF |
635 | struct cifsLockInfo *li = |
636 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
637 | if (li == NULL) |
638 | return -ENOMEM; | |
639 | li->offset = offset; | |
640 | li->length = len; | |
641 | li->type = lockType; | |
796e5661 | 642 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 643 | list_add(&li->llist, &fid->llist); |
796e5661 | 644 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
645 | return 0; |
646 | } | |
647 | ||
1da177e4 LT |
648 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
649 | { | |
650 | int rc, xid; | |
1da177e4 LT |
651 | __u32 numLock = 0; |
652 | __u32 numUnlock = 0; | |
653 | __u64 length; | |
4b18f2a9 | 654 | bool wait_flag = false; |
1da177e4 | 655 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 656 | struct cifsTconInfo *tcon; |
08547b03 SF |
657 | __u16 netfid; |
658 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 659 | bool posix_locking = 0; |
1da177e4 LT |
660 | |
661 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
662 | rc = -EACCES; | |
663 | xid = GetXid(); | |
664 | ||
b6b38f70 | 665 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 666 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 667 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 668 | pfLock->fl_end); |
1da177e4 LT |
669 | |
670 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 671 | cFYI(1, "Posix"); |
1da177e4 | 672 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 673 | cFYI(1, "Flock"); |
1da177e4 | 674 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 675 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 676 | wait_flag = true; |
1da177e4 LT |
677 | } |
678 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
679 | cFYI(1, "Process suspended by mandatory locking - " |
680 | "not implemented yet"); | |
1da177e4 | 681 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 682 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 683 | if (pfLock->fl_flags & |
1da177e4 | 684 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 685 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
686 | |
687 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 688 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
689 | numLock = 1; |
690 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 691 | cFYI(1, "F_UNLCK"); |
1da177e4 | 692 | numUnlock = 1; |
d47d7c1a SF |
693 | /* Check if unlock includes more than |
694 | one lock range */ | |
1da177e4 | 695 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 696 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
697 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
698 | numLock = 1; | |
699 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 700 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
701 | numLock = 1; |
702 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 703 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
704 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
705 | numLock = 1; | |
706 | } else | |
b6b38f70 | 707 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 708 | |
e6a00296 | 709 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 710 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
08547b03 SF |
711 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
712 | ||
13a6e42a SF |
713 | if ((tcon->ses->capabilities & CAP_UNIX) && |
714 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 715 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 716 | posix_locking = 1; |
08547b03 SF |
717 | /* BB add code here to normalize offset and length to |
718 | account for negative length which we can not accept over the | |
719 | wire */ | |
1da177e4 | 720 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 721 | if (posix_locking) { |
08547b03 | 722 | int posix_lock_type; |
fb8c4b14 | 723 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
724 | posix_lock_type = CIFS_RDLCK; |
725 | else | |
726 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 727 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 728 | length, pfLock, |
08547b03 SF |
729 | posix_lock_type, wait_flag); |
730 | FreeXid(xid); | |
731 | return rc; | |
732 | } | |
733 | ||
734 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 735 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
12fed00d | 736 | 0, 1, lockType, 0 /* wait flag */, 0); |
1da177e4 | 737 | if (rc == 0) { |
13a6e42a | 738 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
739 | pfLock->fl_start, 1 /* numUnlock */ , |
740 | 0 /* numLock */ , lockType, | |
12fed00d | 741 | 0 /* wait flag */, 0); |
1da177e4 LT |
742 | pfLock->fl_type = F_UNLCK; |
743 | if (rc != 0) | |
b6b38f70 JP |
744 | cERROR(1, "Error unlocking previously locked " |
745 | "range %d during test of lock", rc); | |
1da177e4 LT |
746 | rc = 0; |
747 | ||
748 | } else { | |
749 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
750 | rc = 0; |
751 | ||
752 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
753 | pfLock->fl_type = F_WRLCK; | |
754 | } else { | |
755 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
756 | pfLock->fl_start, 0, 1, | |
757 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 758 | 0 /* wait flag */, 0); |
f05337c6 PS |
759 | if (rc == 0) { |
760 | rc = CIFSSMBLock(xid, tcon, netfid, | |
761 | length, pfLock->fl_start, 1, 0, | |
762 | lockType | | |
763 | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 764 | 0 /* wait flag */, 0); |
f05337c6 PS |
765 | pfLock->fl_type = F_RDLCK; |
766 | if (rc != 0) | |
f19159dc | 767 | cERROR(1, "Error unlocking " |
f05337c6 | 768 | "previously locked range %d " |
f19159dc | 769 | "during test of lock", rc); |
f05337c6 PS |
770 | rc = 0; |
771 | } else { | |
772 | pfLock->fl_type = F_WRLCK; | |
773 | rc = 0; | |
774 | } | |
775 | } | |
1da177e4 LT |
776 | } |
777 | ||
778 | FreeXid(xid); | |
779 | return rc; | |
780 | } | |
7ee1af76 JA |
781 | |
782 | if (!numLock && !numUnlock) { | |
783 | /* if no lock or unlock then nothing | |
784 | to do since we do not know what it is */ | |
785 | FreeXid(xid); | |
786 | return -EOPNOTSUPP; | |
787 | } | |
788 | ||
789 | if (posix_locking) { | |
08547b03 | 790 | int posix_lock_type; |
fb8c4b14 | 791 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
792 | posix_lock_type = CIFS_RDLCK; |
793 | else | |
794 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 795 | |
fb8c4b14 | 796 | if (numUnlock == 1) |
beb84dc8 | 797 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 798 | |
13a6e42a | 799 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 800 | length, pfLock, |
08547b03 | 801 | posix_lock_type, wait_flag); |
7ee1af76 | 802 | } else { |
c21dfb69 | 803 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
804 | |
805 | if (numLock) { | |
13a6e42a | 806 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
12fed00d PS |
807 | pfLock->fl_start, 0, numLock, lockType, |
808 | wait_flag, 0); | |
7ee1af76 JA |
809 | |
810 | if (rc == 0) { | |
811 | /* For Windows locks we must store them. */ | |
812 | rc = store_file_lock(fid, length, | |
813 | pfLock->fl_start, lockType); | |
814 | } | |
815 | } else if (numUnlock) { | |
816 | /* For each stored lock that this unlock overlaps | |
817 | completely, unlock it. */ | |
818 | int stored_rc = 0; | |
819 | struct cifsLockInfo *li, *tmp; | |
820 | ||
6b70c955 | 821 | rc = 0; |
796e5661 | 822 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
823 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
824 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 825 | (pfLock->fl_start + length) >= |
39db810c | 826 | (li->offset + li->length)) { |
13a6e42a | 827 | stored_rc = CIFSSMBLock(xid, tcon, |
12fed00d PS |
828 | netfid, li->length, |
829 | li->offset, 1, 0, | |
830 | li->type, false, 0); | |
7ee1af76 JA |
831 | if (stored_rc) |
832 | rc = stored_rc; | |
2c964d1f PS |
833 | else { |
834 | list_del(&li->llist); | |
835 | kfree(li); | |
836 | } | |
7ee1af76 JA |
837 | } |
838 | } | |
796e5661 | 839 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
840 | } |
841 | } | |
842 | ||
d634cc15 | 843 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
844 | posix_lock_file_wait(file, pfLock); |
845 | FreeXid(xid); | |
846 | return rc; | |
847 | } | |
848 | ||
fbec9ab9 | 849 | /* update the file size (if needed) after a write */ |
72432ffc | 850 | void |
fbec9ab9 JL |
851 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
852 | unsigned int bytes_written) | |
853 | { | |
854 | loff_t end_of_write = offset + bytes_written; | |
855 | ||
856 | if (end_of_write > cifsi->server_eof) | |
857 | cifsi->server_eof = end_of_write; | |
858 | } | |
859 | ||
7da4b49a JL |
860 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
861 | const char *write_data, size_t write_size, | |
862 | loff_t *poffset) | |
1da177e4 LT |
863 | { |
864 | int rc = 0; | |
865 | unsigned int bytes_written = 0; | |
866 | unsigned int total_written; | |
867 | struct cifs_sb_info *cifs_sb; | |
868 | struct cifsTconInfo *pTcon; | |
7749981e | 869 | int xid; |
7da4b49a JL |
870 | struct dentry *dentry = open_file->dentry; |
871 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 872 | |
7da4b49a | 873 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 874 | |
b6b38f70 | 875 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 876 | *poffset, dentry->d_name.name); |
1da177e4 | 877 | |
13cfb733 | 878 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 879 | |
1da177e4 | 880 | xid = GetXid(); |
1da177e4 | 881 | |
1da177e4 LT |
882 | for (total_written = 0; write_size > total_written; |
883 | total_written += bytes_written) { | |
884 | rc = -EAGAIN; | |
885 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
886 | struct kvec iov[2]; |
887 | unsigned int len; | |
888 | ||
1da177e4 | 889 | if (open_file->invalidHandle) { |
1da177e4 LT |
890 | /* we could deadlock if we called |
891 | filemap_fdatawait from here so tell | |
fb8c4b14 | 892 | reopen_file not to flush data to |
1da177e4 | 893 | server now */ |
15886177 | 894 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
895 | if (rc != 0) |
896 | break; | |
897 | } | |
ca83ce3d JL |
898 | |
899 | len = min((size_t)cifs_sb->wsize, | |
900 | write_size - total_written); | |
901 | /* iov[0] is reserved for smb header */ | |
902 | iov[1].iov_base = (char *)write_data + total_written; | |
903 | iov[1].iov_len = len; | |
904 | rc = CIFSSMBWrite2(xid, pTcon, open_file->netfid, len, | |
905 | *poffset, &bytes_written, iov, 1, 0); | |
1da177e4 LT |
906 | } |
907 | if (rc || (bytes_written == 0)) { | |
908 | if (total_written) | |
909 | break; | |
910 | else { | |
911 | FreeXid(xid); | |
912 | return rc; | |
913 | } | |
fbec9ab9 JL |
914 | } else { |
915 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 916 | *poffset += bytes_written; |
fbec9ab9 | 917 | } |
1da177e4 LT |
918 | } |
919 | ||
a4544347 | 920 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 921 | |
7da4b49a JL |
922 | if (total_written > 0) { |
923 | spin_lock(&dentry->d_inode->i_lock); | |
924 | if (*poffset > dentry->d_inode->i_size) | |
925 | i_size_write(dentry->d_inode, *poffset); | |
926 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 927 | } |
7da4b49a | 928 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
929 | FreeXid(xid); |
930 | return total_written; | |
931 | } | |
932 | ||
6508d904 JL |
933 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
934 | bool fsuid_only) | |
630f3f0c SF |
935 | { |
936 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
937 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
938 | ||
939 | /* only filter by fsuid on multiuser mounts */ | |
940 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
941 | fsuid_only = false; | |
630f3f0c | 942 | |
4477288a | 943 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
944 | /* we could simply get the first_list_entry since write-only entries |
945 | are always at the end of the list but since the first entry might | |
946 | have a close pending, we go through the whole list */ | |
947 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
948 | if (fsuid_only && open_file->uid != current_fsuid()) |
949 | continue; | |
2e396b83 | 950 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
951 | if (!open_file->invalidHandle) { |
952 | /* found a good file */ | |
953 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 954 | cifsFileInfo_get(open_file); |
4477288a | 955 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
956 | return open_file; |
957 | } /* else might as well continue, and look for | |
958 | another, or simply have the caller reopen it | |
959 | again rather than trying to fix this handle */ | |
960 | } else /* write only file */ | |
961 | break; /* write only files are last so must be done */ | |
962 | } | |
4477288a | 963 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
964 | return NULL; |
965 | } | |
630f3f0c | 966 | |
6508d904 JL |
967 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
968 | bool fsuid_only) | |
6148a742 SF |
969 | { |
970 | struct cifsFileInfo *open_file; | |
d3892294 | 971 | struct cifs_sb_info *cifs_sb; |
2846d386 | 972 | bool any_available = false; |
dd99cd80 | 973 | int rc; |
6148a742 | 974 | |
60808233 SF |
975 | /* Having a null inode here (because mapping->host was set to zero by |
976 | the VFS or MM) should not happen but we had reports of on oops (due to | |
977 | it being zero) during stress testcases so we need to check for it */ | |
978 | ||
fb8c4b14 | 979 | if (cifs_inode == NULL) { |
b6b38f70 | 980 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
981 | dump_stack(); |
982 | return NULL; | |
983 | } | |
984 | ||
d3892294 JL |
985 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
986 | ||
6508d904 JL |
987 | /* only filter by fsuid on multiuser mounts */ |
988 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
989 | fsuid_only = false; | |
990 | ||
4477288a | 991 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 992 | refind_writable: |
6148a742 | 993 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
994 | if (!any_available && open_file->pid != current->tgid) |
995 | continue; | |
996 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 997 | continue; |
2e396b83 | 998 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 999 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1000 | |
1001 | if (!open_file->invalidHandle) { | |
1002 | /* found a good writable file */ | |
4477288a | 1003 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1004 | return open_file; |
1005 | } | |
8840dee9 | 1006 | |
4477288a | 1007 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1008 | |
9b22b0b7 | 1009 | /* Had to unlock since following call can block */ |
15886177 | 1010 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1011 | if (!rc) |
1012 | return open_file; | |
9b22b0b7 | 1013 | |
cdff08e7 | 1014 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1015 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1016 | cifsFileInfo_put(open_file); |
8840dee9 | 1017 | |
cdff08e7 SF |
1018 | spin_lock(&cifs_file_list_lock); |
1019 | ||
9b22b0b7 SF |
1020 | /* else we simply continue to the next entry. Thus |
1021 | we do not loop on reopen errors. If we | |
1022 | can not reopen the file, for example if we | |
1023 | reconnected to a server with another client | |
1024 | racing to delete or lock the file we would not | |
1025 | make progress if we restarted before the beginning | |
1026 | of the loop here. */ | |
6148a742 SF |
1027 | } |
1028 | } | |
2846d386 JL |
1029 | /* couldn't find useable FH with same pid, try any available */ |
1030 | if (!any_available) { | |
1031 | any_available = true; | |
1032 | goto refind_writable; | |
1033 | } | |
4477288a | 1034 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1035 | return NULL; |
1036 | } | |
1037 | ||
1da177e4 LT |
1038 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1039 | { | |
1040 | struct address_space *mapping = page->mapping; | |
1041 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1042 | char *write_data; | |
1043 | int rc = -EFAULT; | |
1044 | int bytes_written = 0; | |
1da177e4 | 1045 | struct inode *inode; |
6148a742 | 1046 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1047 | |
1048 | if (!mapping || !mapping->host) | |
1049 | return -EFAULT; | |
1050 | ||
1051 | inode = page->mapping->host; | |
1da177e4 LT |
1052 | |
1053 | offset += (loff_t)from; | |
1054 | write_data = kmap(page); | |
1055 | write_data += from; | |
1056 | ||
1057 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1058 | kunmap(page); | |
1059 | return -EIO; | |
1060 | } | |
1061 | ||
1062 | /* racing with truncate? */ | |
1063 | if (offset > mapping->host->i_size) { | |
1064 | kunmap(page); | |
1065 | return 0; /* don't care */ | |
1066 | } | |
1067 | ||
1068 | /* check to make sure that we are not extending the file */ | |
1069 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1070 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1071 | |
6508d904 | 1072 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1073 | if (open_file) { |
7da4b49a JL |
1074 | bytes_written = cifs_write(open_file, write_data, |
1075 | to - from, &offset); | |
6ab409b5 | 1076 | cifsFileInfo_put(open_file); |
1da177e4 | 1077 | /* Does mm or vfs already set times? */ |
6148a742 | 1078 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1079 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1080 | rc = 0; |
bb5a9a04 SF |
1081 | else if (bytes_written < 0) |
1082 | rc = bytes_written; | |
6148a742 | 1083 | } else { |
b6b38f70 | 1084 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1085 | rc = -EIO; |
1086 | } | |
1087 | ||
1088 | kunmap(page); | |
1089 | return rc; | |
1090 | } | |
1091 | ||
1da177e4 | 1092 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1093 | struct writeback_control *wbc) |
1da177e4 | 1094 | { |
37c0eb46 SF |
1095 | unsigned int bytes_to_write; |
1096 | unsigned int bytes_written; | |
1097 | struct cifs_sb_info *cifs_sb; | |
1098 | int done = 0; | |
111ebb6e | 1099 | pgoff_t end; |
37c0eb46 | 1100 | pgoff_t index; |
fb8c4b14 SF |
1101 | int range_whole = 0; |
1102 | struct kvec *iov; | |
84d2f07e | 1103 | int len; |
37c0eb46 SF |
1104 | int n_iov = 0; |
1105 | pgoff_t next; | |
1106 | int nr_pages; | |
1107 | __u64 offset = 0; | |
23e7dd7d | 1108 | struct cifsFileInfo *open_file; |
ba00ba64 | 1109 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1110 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1111 | struct page *page; |
1112 | struct pagevec pvec; | |
1113 | int rc = 0; | |
1114 | int scanned = 0; | |
7749981e | 1115 | int xid; |
1da177e4 | 1116 | |
37c0eb46 | 1117 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1118 | |
37c0eb46 SF |
1119 | /* |
1120 | * If wsize is smaller that the page cache size, default to writing | |
1121 | * one page at a time via cifs_writepage | |
1122 | */ | |
1123 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1124 | return generic_writepages(mapping, wbc); | |
1125 | ||
9a0c8230 | 1126 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1127 | if (iov == NULL) |
9a0c8230 SF |
1128 | return generic_writepages(mapping, wbc); |
1129 | ||
37c0eb46 | 1130 | /* |
f3983c21 JL |
1131 | * if there's no open file, then this is likely to fail too, |
1132 | * but it'll at least handle the return. Maybe it should be | |
1133 | * a BUG() instead? | |
37c0eb46 | 1134 | */ |
6508d904 | 1135 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1136 | if (!open_file) { |
9a0c8230 | 1137 | kfree(iov); |
f3983c21 JL |
1138 | return generic_writepages(mapping, wbc); |
1139 | } | |
1140 | ||
13cfb733 | 1141 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 | 1142 | cifsFileInfo_put(open_file); |
37c0eb46 | 1143 | |
1da177e4 LT |
1144 | xid = GetXid(); |
1145 | ||
37c0eb46 | 1146 | pagevec_init(&pvec, 0); |
111ebb6e | 1147 | if (wbc->range_cyclic) { |
37c0eb46 | 1148 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1149 | end = -1; |
1150 | } else { | |
1151 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1152 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1153 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1154 | range_whole = 1; | |
37c0eb46 SF |
1155 | scanned = 1; |
1156 | } | |
1157 | retry: | |
1158 | while (!done && (index <= end) && | |
1159 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1160 | PAGECACHE_TAG_DIRTY, | |
1161 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1162 | int first; | |
1163 | unsigned int i; | |
1164 | ||
37c0eb46 SF |
1165 | first = -1; |
1166 | next = 0; | |
1167 | n_iov = 0; | |
1168 | bytes_to_write = 0; | |
1169 | ||
1170 | for (i = 0; i < nr_pages; i++) { | |
1171 | page = pvec.pages[i]; | |
1172 | /* | |
1173 | * At this point we hold neither mapping->tree_lock nor | |
1174 | * lock on the page itself: the page may be truncated or | |
1175 | * invalidated (changing page->mapping to NULL), or even | |
1176 | * swizzled back from swapper_space to tmpfs file | |
1177 | * mapping | |
1178 | */ | |
1179 | ||
1180 | if (first < 0) | |
1181 | lock_page(page); | |
529ae9aa | 1182 | else if (!trylock_page(page)) |
37c0eb46 SF |
1183 | break; |
1184 | ||
1185 | if (unlikely(page->mapping != mapping)) { | |
1186 | unlock_page(page); | |
1187 | break; | |
1188 | } | |
1189 | ||
111ebb6e | 1190 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1191 | done = 1; |
1192 | unlock_page(page); | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (next && (page->index != next)) { | |
1197 | /* Not next consecutive page */ | |
1198 | unlock_page(page); | |
1199 | break; | |
1200 | } | |
1201 | ||
1202 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1203 | wait_on_page_writeback(page); | |
1204 | ||
1205 | if (PageWriteback(page) || | |
cb876f45 | 1206 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1207 | unlock_page(page); |
1208 | break; | |
1209 | } | |
84d2f07e | 1210 | |
cb876f45 LT |
1211 | /* |
1212 | * This actually clears the dirty bit in the radix tree. | |
1213 | * See cifs_writepage() for more commentary. | |
1214 | */ | |
1215 | set_page_writeback(page); | |
1216 | ||
84d2f07e SF |
1217 | if (page_offset(page) >= mapping->host->i_size) { |
1218 | done = 1; | |
1219 | unlock_page(page); | |
cb876f45 | 1220 | end_page_writeback(page); |
84d2f07e SF |
1221 | break; |
1222 | } | |
1223 | ||
37c0eb46 SF |
1224 | /* |
1225 | * BB can we get rid of this? pages are held by pvec | |
1226 | */ | |
1227 | page_cache_get(page); | |
1228 | ||
84d2f07e SF |
1229 | len = min(mapping->host->i_size - page_offset(page), |
1230 | (loff_t)PAGE_CACHE_SIZE); | |
1231 | ||
37c0eb46 SF |
1232 | /* reserve iov[0] for the smb header */ |
1233 | n_iov++; | |
1234 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1235 | iov[n_iov].iov_len = len; |
1236 | bytes_to_write += len; | |
37c0eb46 SF |
1237 | |
1238 | if (first < 0) { | |
1239 | first = i; | |
1240 | offset = page_offset(page); | |
1241 | } | |
1242 | next = page->index + 1; | |
1243 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1244 | break; | |
1245 | } | |
1246 | if (n_iov) { | |
941b853d | 1247 | retry_write: |
6508d904 JL |
1248 | open_file = find_writable_file(CIFS_I(mapping->host), |
1249 | false); | |
23e7dd7d | 1250 | if (!open_file) { |
b6b38f70 | 1251 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1252 | rc = -EBADF; |
1047abc1 | 1253 | } else { |
f3983c21 | 1254 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1255 | bytes_to_write, offset, |
1256 | &bytes_written, iov, n_iov, | |
7749981e | 1257 | 0); |
6ab409b5 | 1258 | cifsFileInfo_put(open_file); |
f3983c21 | 1259 | } |
fbec9ab9 | 1260 | |
941b853d JL |
1261 | cFYI(1, "Write2 rc=%d, wrote=%u", rc, bytes_written); |
1262 | ||
1263 | /* | |
1264 | * For now, treat a short write as if nothing got | |
1265 | * written. A zero length write however indicates | |
1266 | * ENOSPC or EFBIG. We have no way to know which | |
1267 | * though, so call it ENOSPC for now. EFBIG would | |
1268 | * get translated to AS_EIO anyway. | |
1269 | * | |
1270 | * FIXME: make it take into account the data that did | |
1271 | * get written | |
1272 | */ | |
1273 | if (rc == 0) { | |
1274 | if (bytes_written == 0) | |
1275 | rc = -ENOSPC; | |
1276 | else if (bytes_written < bytes_to_write) | |
1277 | rc = -EAGAIN; | |
1278 | } | |
1279 | ||
1280 | /* retry on data-integrity flush */ | |
1281 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) | |
1282 | goto retry_write; | |
1283 | ||
1284 | /* fix the stats and EOF */ | |
1285 | if (bytes_written > 0) { | |
f3983c21 | 1286 | cifs_stats_bytes_written(tcon, bytes_written); |
941b853d | 1287 | cifs_update_eof(cifsi, offset, bytes_written); |
37c0eb46 | 1288 | } |
f3983c21 | 1289 | |
37c0eb46 SF |
1290 | for (i = 0; i < n_iov; i++) { |
1291 | page = pvec.pages[first + i]; | |
941b853d JL |
1292 | /* on retryable write error, redirty page */ |
1293 | if (rc == -EAGAIN) | |
1294 | redirty_page_for_writepage(wbc, page); | |
1295 | else if (rc != 0) | |
eb9bdaa3 | 1296 | SetPageError(page); |
37c0eb46 SF |
1297 | kunmap(page); |
1298 | unlock_page(page); | |
cb876f45 | 1299 | end_page_writeback(page); |
37c0eb46 SF |
1300 | page_cache_release(page); |
1301 | } | |
941b853d JL |
1302 | |
1303 | if (rc != -EAGAIN) | |
1304 | mapping_set_error(mapping, rc); | |
1305 | else | |
1306 | rc = 0; | |
1307 | ||
37c0eb46 SF |
1308 | if ((wbc->nr_to_write -= n_iov) <= 0) |
1309 | done = 1; | |
1310 | index = next; | |
b066a48c DK |
1311 | } else |
1312 | /* Need to re-find the pages we skipped */ | |
1313 | index = pvec.pages[0]->index + 1; | |
1314 | ||
37c0eb46 SF |
1315 | pagevec_release(&pvec); |
1316 | } | |
1317 | if (!scanned && !done) { | |
1318 | /* | |
1319 | * We hit the last page and there is more work to be done: wrap | |
1320 | * back to the start of the file | |
1321 | */ | |
1322 | scanned = 1; | |
1323 | index = 0; | |
1324 | goto retry; | |
1325 | } | |
111ebb6e | 1326 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1327 | mapping->writeback_index = index; |
1328 | ||
1da177e4 | 1329 | FreeXid(xid); |
9a0c8230 | 1330 | kfree(iov); |
1da177e4 LT |
1331 | return rc; |
1332 | } | |
1da177e4 | 1333 | |
9ad1506b PS |
1334 | static int |
1335 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1336 | { |
9ad1506b | 1337 | int rc; |
1da177e4 LT |
1338 | int xid; |
1339 | ||
1340 | xid = GetXid(); | |
1341 | /* BB add check for wbc flags */ | |
1342 | page_cache_get(page); | |
ad7a2926 | 1343 | if (!PageUptodate(page)) |
b6b38f70 | 1344 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1345 | |
1346 | /* | |
1347 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1348 | * | |
1349 | * A writepage() implementation always needs to do either this, | |
1350 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1351 | * the case of a failure. | |
1352 | * | |
1353 | * Just unlocking the page will cause the radix tree tag-bits | |
1354 | * to fail to update with the state of the page correctly. | |
1355 | */ | |
fb8c4b14 | 1356 | set_page_writeback(page); |
9ad1506b | 1357 | retry_write: |
1da177e4 | 1358 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1359 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1360 | goto retry_write; | |
1361 | else if (rc == -EAGAIN) | |
1362 | redirty_page_for_writepage(wbc, page); | |
1363 | else if (rc != 0) | |
1364 | SetPageError(page); | |
1365 | else | |
1366 | SetPageUptodate(page); | |
cb876f45 LT |
1367 | end_page_writeback(page); |
1368 | page_cache_release(page); | |
1da177e4 LT |
1369 | FreeXid(xid); |
1370 | return rc; | |
1371 | } | |
1372 | ||
9ad1506b PS |
1373 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1374 | { | |
1375 | int rc = cifs_writepage_locked(page, wbc); | |
1376 | unlock_page(page); | |
1377 | return rc; | |
1378 | } | |
1379 | ||
d9414774 NP |
1380 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1381 | loff_t pos, unsigned len, unsigned copied, | |
1382 | struct page *page, void *fsdata) | |
1da177e4 | 1383 | { |
d9414774 NP |
1384 | int rc; |
1385 | struct inode *inode = mapping->host; | |
1da177e4 | 1386 | |
b6b38f70 JP |
1387 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1388 | page, pos, copied); | |
d9414774 | 1389 | |
a98ee8c1 JL |
1390 | if (PageChecked(page)) { |
1391 | if (copied == len) | |
1392 | SetPageUptodate(page); | |
1393 | ClearPageChecked(page); | |
1394 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1395 | SetPageUptodate(page); |
ad7a2926 | 1396 | |
1da177e4 | 1397 | if (!PageUptodate(page)) { |
d9414774 NP |
1398 | char *page_data; |
1399 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1400 | int xid; | |
1401 | ||
1402 | xid = GetXid(); | |
1da177e4 LT |
1403 | /* this is probably better than directly calling |
1404 | partialpage_write since in this function the file handle is | |
1405 | known which we might as well leverage */ | |
1406 | /* BB check if anything else missing out of ppw | |
1407 | such as updating last write time */ | |
1408 | page_data = kmap(page); | |
7da4b49a JL |
1409 | rc = cifs_write(file->private_data, page_data + offset, |
1410 | copied, &pos); | |
d9414774 | 1411 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1412 | kunmap(page); |
d9414774 NP |
1413 | |
1414 | FreeXid(xid); | |
fb8c4b14 | 1415 | } else { |
d9414774 NP |
1416 | rc = copied; |
1417 | pos += copied; | |
1da177e4 LT |
1418 | set_page_dirty(page); |
1419 | } | |
1420 | ||
d9414774 NP |
1421 | if (rc > 0) { |
1422 | spin_lock(&inode->i_lock); | |
1423 | if (pos > inode->i_size) | |
1424 | i_size_write(inode, pos); | |
1425 | spin_unlock(&inode->i_lock); | |
1426 | } | |
1427 | ||
1428 | unlock_page(page); | |
1429 | page_cache_release(page); | |
1430 | ||
1da177e4 LT |
1431 | return rc; |
1432 | } | |
1433 | ||
8be7e6ba | 1434 | int cifs_strict_fsync(struct file *file, int datasync) |
1da177e4 LT |
1435 | { |
1436 | int xid; | |
1437 | int rc = 0; | |
b298f223 | 1438 | struct cifsTconInfo *tcon; |
c21dfb69 | 1439 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1440 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1441 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 LT |
1442 | |
1443 | xid = GetXid(); | |
1444 | ||
b6b38f70 | 1445 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1446 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1447 | |
8be7e6ba PS |
1448 | if (!CIFS_I(inode)->clientCanCacheRead) |
1449 | cifs_invalidate_mapping(inode); | |
eb4b756b | 1450 | |
8be7e6ba PS |
1451 | tcon = tlink_tcon(smbfile->tlink); |
1452 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1453 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1454 | ||
1455 | FreeXid(xid); | |
1456 | return rc; | |
1457 | } | |
1458 | ||
1459 | int cifs_fsync(struct file *file, int datasync) | |
1460 | { | |
1461 | int xid; | |
1462 | int rc = 0; | |
1463 | struct cifsTconInfo *tcon; | |
1464 | struct cifsFileInfo *smbfile = file->private_data; | |
1465 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1466 | ||
1467 | xid = GetXid(); | |
1468 | ||
1469 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1470 | file->f_path.dentry->d_name.name, datasync); | |
1471 | ||
1472 | tcon = tlink_tcon(smbfile->tlink); | |
1473 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1474 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1475 | |
1da177e4 LT |
1476 | FreeXid(xid); |
1477 | return rc; | |
1478 | } | |
1479 | ||
1da177e4 LT |
1480 | /* |
1481 | * As file closes, flush all cached write data for this inode checking | |
1482 | * for write behind errors. | |
1483 | */ | |
75e1fcc0 | 1484 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1485 | { |
fb8c4b14 | 1486 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1487 | int rc = 0; |
1488 | ||
eb4b756b | 1489 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1490 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1491 | |
b6b38f70 | 1492 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1493 | |
1494 | return rc; | |
1495 | } | |
1496 | ||
72432ffc PS |
1497 | static int |
1498 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
1499 | { | |
1500 | int rc = 0; | |
1501 | unsigned long i; | |
1502 | ||
1503 | for (i = 0; i < num_pages; i++) { | |
1504 | pages[i] = alloc_page(__GFP_HIGHMEM); | |
1505 | if (!pages[i]) { | |
1506 | /* | |
1507 | * save number of pages we have already allocated and | |
1508 | * return with ENOMEM error | |
1509 | */ | |
1510 | num_pages = i; | |
1511 | rc = -ENOMEM; | |
1512 | goto error; | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | return rc; | |
1517 | ||
1518 | error: | |
1519 | for (i = 0; i < num_pages; i++) | |
1520 | put_page(pages[i]); | |
1521 | return rc; | |
1522 | } | |
1523 | ||
1524 | static inline | |
1525 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
1526 | { | |
1527 | size_t num_pages; | |
1528 | size_t clen; | |
1529 | ||
1530 | clen = min_t(const size_t, len, wsize); | |
1531 | num_pages = clen / PAGE_CACHE_SIZE; | |
1532 | if (clen % PAGE_CACHE_SIZE) | |
1533 | num_pages++; | |
1534 | ||
1535 | if (cur_len) | |
1536 | *cur_len = clen; | |
1537 | ||
1538 | return num_pages; | |
1539 | } | |
1540 | ||
1541 | static ssize_t | |
1542 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
1543 | unsigned long nr_segs, loff_t *poffset) | |
1544 | { | |
76429c14 PS |
1545 | unsigned int written; |
1546 | unsigned long num_pages, npages, i; | |
1547 | size_t copied, len, cur_len; | |
1548 | ssize_t total_written = 0; | |
72432ffc PS |
1549 | struct kvec *to_send; |
1550 | struct page **pages; | |
1551 | struct iov_iter it; | |
1552 | struct inode *inode; | |
1553 | struct cifsFileInfo *open_file; | |
1554 | struct cifsTconInfo *pTcon; | |
1555 | struct cifs_sb_info *cifs_sb; | |
1556 | int xid, rc; | |
1557 | ||
1558 | len = iov_length(iov, nr_segs); | |
1559 | if (!len) | |
1560 | return 0; | |
1561 | ||
1562 | rc = generic_write_checks(file, poffset, &len, 0); | |
1563 | if (rc) | |
1564 | return rc; | |
1565 | ||
1566 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1567 | num_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1568 | ||
1569 | pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL); | |
1570 | if (!pages) | |
1571 | return -ENOMEM; | |
1572 | ||
1573 | to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL); | |
1574 | if (!to_send) { | |
1575 | kfree(pages); | |
1576 | return -ENOMEM; | |
1577 | } | |
1578 | ||
1579 | rc = cifs_write_allocate_pages(pages, num_pages); | |
1580 | if (rc) { | |
1581 | kfree(pages); | |
1582 | kfree(to_send); | |
1583 | return rc; | |
1584 | } | |
1585 | ||
1586 | xid = GetXid(); | |
1587 | open_file = file->private_data; | |
1588 | pTcon = tlink_tcon(open_file->tlink); | |
1589 | inode = file->f_path.dentry->d_inode; | |
1590 | ||
1591 | iov_iter_init(&it, iov, nr_segs, len, 0); | |
1592 | npages = num_pages; | |
1593 | ||
1594 | do { | |
1595 | size_t save_len = cur_len; | |
1596 | for (i = 0; i < npages; i++) { | |
1597 | copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE); | |
1598 | copied = iov_iter_copy_from_user(pages[i], &it, 0, | |
1599 | copied); | |
1600 | cur_len -= copied; | |
1601 | iov_iter_advance(&it, copied); | |
1602 | to_send[i+1].iov_base = kmap(pages[i]); | |
1603 | to_send[i+1].iov_len = copied; | |
1604 | } | |
1605 | ||
1606 | cur_len = save_len - cur_len; | |
1607 | ||
1608 | do { | |
1609 | if (open_file->invalidHandle) { | |
1610 | rc = cifs_reopen_file(open_file, false); | |
1611 | if (rc != 0) | |
1612 | break; | |
1613 | } | |
1614 | rc = CIFSSMBWrite2(xid, pTcon, open_file->netfid, | |
1615 | cur_len, *poffset, &written, | |
1616 | to_send, npages, 0); | |
1617 | } while (rc == -EAGAIN); | |
1618 | ||
1619 | for (i = 0; i < npages; i++) | |
1620 | kunmap(pages[i]); | |
1621 | ||
1622 | if (written) { | |
1623 | len -= written; | |
1624 | total_written += written; | |
1625 | cifs_update_eof(CIFS_I(inode), *poffset, written); | |
1626 | *poffset += written; | |
1627 | } else if (rc < 0) { | |
1628 | if (!total_written) | |
1629 | total_written = rc; | |
1630 | break; | |
1631 | } | |
1632 | ||
1633 | /* get length and number of kvecs of the next write */ | |
1634 | npages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1635 | } while (len > 0); | |
1636 | ||
1637 | if (total_written > 0) { | |
1638 | spin_lock(&inode->i_lock); | |
1639 | if (*poffset > inode->i_size) | |
1640 | i_size_write(inode, *poffset); | |
1641 | spin_unlock(&inode->i_lock); | |
1642 | } | |
1643 | ||
1644 | cifs_stats_bytes_written(pTcon, total_written); | |
1645 | mark_inode_dirty_sync(inode); | |
1646 | ||
1647 | for (i = 0; i < num_pages; i++) | |
1648 | put_page(pages[i]); | |
1649 | kfree(to_send); | |
1650 | kfree(pages); | |
1651 | FreeXid(xid); | |
1652 | return total_written; | |
1653 | } | |
1654 | ||
0b81c1c4 | 1655 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
1656 | unsigned long nr_segs, loff_t pos) |
1657 | { | |
1658 | ssize_t written; | |
1659 | struct inode *inode; | |
1660 | ||
1661 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1662 | ||
1663 | /* | |
1664 | * BB - optimize the way when signing is disabled. We can drop this | |
1665 | * extra memory-to-memory copying and use iovec buffers for constructing | |
1666 | * write request. | |
1667 | */ | |
1668 | ||
1669 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
1670 | if (written > 0) { | |
1671 | CIFS_I(inode)->invalid_mapping = true; | |
1672 | iocb->ki_pos = pos; | |
1673 | } | |
1674 | ||
1675 | return written; | |
1676 | } | |
1677 | ||
1678 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
1679 | unsigned long nr_segs, loff_t pos) | |
1680 | { | |
1681 | struct inode *inode; | |
1682 | ||
1683 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1684 | ||
1685 | if (CIFS_I(inode)->clientCanCacheAll) | |
1686 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
1687 | ||
1688 | /* | |
1689 | * In strict cache mode we need to write the data to the server exactly | |
1690 | * from the pos to pos+len-1 rather than flush all affected pages | |
1691 | * because it may cause a error with mandatory locks on these pages but | |
1692 | * not on the region from pos to ppos+len-1. | |
1693 | */ | |
1694 | ||
1695 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
1696 | } | |
1697 | ||
a70307ee PS |
1698 | static ssize_t |
1699 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
1700 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 1701 | { |
a70307ee PS |
1702 | int rc; |
1703 | int xid; | |
76429c14 PS |
1704 | ssize_t total_read; |
1705 | unsigned int bytes_read = 0; | |
a70307ee PS |
1706 | size_t len, cur_len; |
1707 | int iov_offset = 0; | |
1da177e4 LT |
1708 | struct cifs_sb_info *cifs_sb; |
1709 | struct cifsTconInfo *pTcon; | |
1da177e4 | 1710 | struct cifsFileInfo *open_file; |
1da177e4 | 1711 | struct smb_com_read_rsp *pSMBr; |
a70307ee PS |
1712 | char *read_data; |
1713 | ||
1714 | if (!nr_segs) | |
1715 | return 0; | |
1716 | ||
1717 | len = iov_length(iov, nr_segs); | |
1718 | if (!len) | |
1719 | return 0; | |
1da177e4 LT |
1720 | |
1721 | xid = GetXid(); | |
e6a00296 | 1722 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1723 | |
c21dfb69 | 1724 | open_file = file->private_data; |
13cfb733 | 1725 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1726 | |
ad7a2926 | 1727 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1728 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1729 | |
a70307ee PS |
1730 | for (total_read = 0; total_read < len; total_read += bytes_read) { |
1731 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
1da177e4 | 1732 | rc = -EAGAIN; |
a70307ee PS |
1733 | read_data = NULL; |
1734 | ||
1da177e4 | 1735 | while (rc == -EAGAIN) { |
ec637e3f | 1736 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1737 | if (open_file->invalidHandle) { |
15886177 | 1738 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1739 | if (rc != 0) |
1740 | break; | |
1741 | } | |
a70307ee PS |
1742 | rc = CIFSSMBRead(xid, pTcon, open_file->netfid, |
1743 | cur_len, *poffset, &bytes_read, | |
1744 | &read_data, &buf_type); | |
1745 | pSMBr = (struct smb_com_read_rsp *)read_data; | |
1746 | if (read_data) { | |
1747 | char *data_offset = read_data + 4 + | |
1748 | le16_to_cpu(pSMBr->DataOffset); | |
1749 | if (memcpy_toiovecend(iov, data_offset, | |
1750 | iov_offset, bytes_read)) | |
93544cc6 | 1751 | rc = -EFAULT; |
fb8c4b14 | 1752 | if (buf_type == CIFS_SMALL_BUFFER) |
a70307ee | 1753 | cifs_small_buf_release(read_data); |
fb8c4b14 | 1754 | else if (buf_type == CIFS_LARGE_BUFFER) |
a70307ee PS |
1755 | cifs_buf_release(read_data); |
1756 | read_data = NULL; | |
1757 | iov_offset += bytes_read; | |
1da177e4 LT |
1758 | } |
1759 | } | |
a70307ee | 1760 | |
1da177e4 LT |
1761 | if (rc || (bytes_read == 0)) { |
1762 | if (total_read) { | |
1763 | break; | |
1764 | } else { | |
1765 | FreeXid(xid); | |
1766 | return rc; | |
1767 | } | |
1768 | } else { | |
a4544347 | 1769 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1770 | *poffset += bytes_read; |
1771 | } | |
1772 | } | |
a70307ee | 1773 | |
1da177e4 LT |
1774 | FreeXid(xid); |
1775 | return total_read; | |
1776 | } | |
1777 | ||
0b81c1c4 | 1778 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
1779 | unsigned long nr_segs, loff_t pos) |
1780 | { | |
1781 | ssize_t read; | |
1782 | ||
1783 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
1784 | if (read > 0) | |
1785 | iocb->ki_pos = pos; | |
1786 | ||
1787 | return read; | |
1788 | } | |
1789 | ||
1790 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
1791 | unsigned long nr_segs, loff_t pos) | |
1792 | { | |
1793 | struct inode *inode; | |
1794 | ||
1795 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1796 | ||
1797 | if (CIFS_I(inode)->clientCanCacheRead) | |
1798 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
1799 | ||
1800 | /* | |
1801 | * In strict cache mode we need to read from the server all the time | |
1802 | * if we don't have level II oplock because the server can delay mtime | |
1803 | * change - so we can't make a decision about inode invalidating. | |
1804 | * And we can also fail with pagereading if there are mandatory locks | |
1805 | * on pages affected by this read but not on the region from pos to | |
1806 | * pos+len-1. | |
1807 | */ | |
1808 | ||
1809 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
1810 | } | |
1da177e4 LT |
1811 | |
1812 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
a70307ee | 1813 | loff_t *poffset) |
1da177e4 LT |
1814 | { |
1815 | int rc = -EACCES; | |
1816 | unsigned int bytes_read = 0; | |
1817 | unsigned int total_read; | |
1818 | unsigned int current_read_size; | |
1819 | struct cifs_sb_info *cifs_sb; | |
1820 | struct cifsTconInfo *pTcon; | |
1821 | int xid; | |
1822 | char *current_offset; | |
1823 | struct cifsFileInfo *open_file; | |
ec637e3f | 1824 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1825 | |
1826 | xid = GetXid(); | |
e6a00296 | 1827 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1828 | |
1829 | if (file->private_data == NULL) { | |
0f3bc09e | 1830 | rc = -EBADF; |
1da177e4 | 1831 | FreeXid(xid); |
0f3bc09e | 1832 | return rc; |
1da177e4 | 1833 | } |
c21dfb69 | 1834 | open_file = file->private_data; |
13cfb733 | 1835 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1836 | |
1837 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1838 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1839 | |
fb8c4b14 | 1840 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1841 | read_size > total_read; |
1842 | total_read += bytes_read, current_offset += bytes_read) { | |
1843 | current_read_size = min_t(const int, read_size - total_read, | |
1844 | cifs_sb->rsize); | |
f9f5c817 SF |
1845 | /* For windows me and 9x we do not want to request more |
1846 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1847 | if ((pTcon->ses) && |
f9f5c817 SF |
1848 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1849 | current_read_size = min_t(const int, current_read_size, | |
1850 | pTcon->ses->server->maxBuf - 128); | |
1851 | } | |
1da177e4 LT |
1852 | rc = -EAGAIN; |
1853 | while (rc == -EAGAIN) { | |
cdff08e7 | 1854 | if (open_file->invalidHandle) { |
15886177 | 1855 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1856 | if (rc != 0) |
1857 | break; | |
1858 | } | |
bfa0d75a | 1859 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1860 | open_file->netfid, |
1861 | current_read_size, *poffset, | |
1862 | &bytes_read, ¤t_offset, | |
1863 | &buf_type); | |
1da177e4 LT |
1864 | } |
1865 | if (rc || (bytes_read == 0)) { | |
1866 | if (total_read) { | |
1867 | break; | |
1868 | } else { | |
1869 | FreeXid(xid); | |
1870 | return rc; | |
1871 | } | |
1872 | } else { | |
a4544347 | 1873 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1874 | *poffset += bytes_read; |
1875 | } | |
1876 | } | |
1877 | FreeXid(xid); | |
1878 | return total_read; | |
1879 | } | |
1880 | ||
ca83ce3d JL |
1881 | /* |
1882 | * If the page is mmap'ed into a process' page tables, then we need to make | |
1883 | * sure that it doesn't change while being written back. | |
1884 | */ | |
1885 | static int | |
1886 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1887 | { | |
1888 | struct page *page = vmf->page; | |
1889 | ||
1890 | lock_page(page); | |
1891 | return VM_FAULT_LOCKED; | |
1892 | } | |
1893 | ||
1894 | static struct vm_operations_struct cifs_file_vm_ops = { | |
1895 | .fault = filemap_fault, | |
1896 | .page_mkwrite = cifs_page_mkwrite, | |
1897 | }; | |
1898 | ||
7a6a19b1 PS |
1899 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
1900 | { | |
1901 | int rc, xid; | |
1902 | struct inode *inode = file->f_path.dentry->d_inode; | |
1903 | ||
1904 | xid = GetXid(); | |
1905 | ||
1906 | if (!CIFS_I(inode)->clientCanCacheRead) | |
1907 | cifs_invalidate_mapping(inode); | |
1908 | ||
1909 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
1910 | if (rc == 0) |
1911 | vma->vm_ops = &cifs_file_vm_ops; | |
7a6a19b1 PS |
1912 | FreeXid(xid); |
1913 | return rc; | |
1914 | } | |
1915 | ||
1da177e4 LT |
1916 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
1917 | { | |
1da177e4 LT |
1918 | int rc, xid; |
1919 | ||
1920 | xid = GetXid(); | |
abab095d | 1921 | rc = cifs_revalidate_file(file); |
1da177e4 | 1922 | if (rc) { |
b6b38f70 | 1923 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1924 | FreeXid(xid); |
1925 | return rc; | |
1926 | } | |
1927 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
1928 | if (rc == 0) |
1929 | vma->vm_ops = &cifs_file_vm_ops; | |
1da177e4 LT |
1930 | FreeXid(xid); |
1931 | return rc; | |
1932 | } | |
1933 | ||
1934 | ||
fb8c4b14 | 1935 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1936 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1937 | { |
1938 | struct page *page; | |
1939 | char *target; | |
1940 | ||
1941 | while (bytes_read > 0) { | |
1942 | if (list_empty(pages)) | |
1943 | break; | |
1944 | ||
1945 | page = list_entry(pages->prev, struct page, lru); | |
1946 | list_del(&page->lru); | |
1947 | ||
315e995c | 1948 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1949 | GFP_KERNEL)) { |
1950 | page_cache_release(page); | |
b6b38f70 | 1951 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1952 | data += PAGE_CACHE_SIZE; |
1953 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1954 | continue; |
1955 | } | |
06b43672 | 1956 | page_cache_release(page); |
1da177e4 | 1957 | |
fb8c4b14 | 1958 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1959 | |
1960 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1961 | memcpy(target, data, bytes_read); | |
1962 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1963 | memset(target + bytes_read, 0, |
1da177e4 LT |
1964 | PAGE_CACHE_SIZE - bytes_read); |
1965 | bytes_read = 0; | |
1966 | } else { | |
1967 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1968 | bytes_read -= PAGE_CACHE_SIZE; | |
1969 | } | |
1970 | kunmap_atomic(target, KM_USER0); | |
1971 | ||
1972 | flush_dcache_page(page); | |
1973 | SetPageUptodate(page); | |
1974 | unlock_page(page); | |
1da177e4 | 1975 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1976 | |
1977 | /* add page to FS-Cache */ | |
1978 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1979 | } |
1980 | return; | |
1981 | } | |
1982 | ||
1983 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1984 | struct list_head *page_list, unsigned num_pages) | |
1985 | { | |
1986 | int rc = -EACCES; | |
1987 | int xid; | |
1988 | loff_t offset; | |
1989 | struct page *page; | |
1990 | struct cifs_sb_info *cifs_sb; | |
1991 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1992 | unsigned int bytes_read = 0; |
fb8c4b14 | 1993 | unsigned int read_size, i; |
1da177e4 LT |
1994 | char *smb_read_data = NULL; |
1995 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1996 | struct cifsFileInfo *open_file; |
ec637e3f | 1997 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1998 | |
1999 | xid = GetXid(); | |
2000 | if (file->private_data == NULL) { | |
0f3bc09e | 2001 | rc = -EBADF; |
1da177e4 | 2002 | FreeXid(xid); |
0f3bc09e | 2003 | return rc; |
1da177e4 | 2004 | } |
c21dfb69 | 2005 | open_file = file->private_data; |
e6a00296 | 2006 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 2007 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 2008 | |
56698236 SJ |
2009 | /* |
2010 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2011 | * immediately if the cookie is negative | |
2012 | */ | |
2013 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2014 | &num_pages); | |
2015 | if (rc == 0) | |
2016 | goto read_complete; | |
2017 | ||
f19159dc | 2018 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
2019 | for (i = 0; i < num_pages; ) { |
2020 | unsigned contig_pages; | |
2021 | struct page *tmp_page; | |
2022 | unsigned long expected_index; | |
2023 | ||
2024 | if (list_empty(page_list)) | |
2025 | break; | |
2026 | ||
2027 | page = list_entry(page_list->prev, struct page, lru); | |
2028 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2029 | ||
2030 | /* count adjacent pages that we will read into */ | |
2031 | contig_pages = 0; | |
fb8c4b14 | 2032 | expected_index = |
1da177e4 | 2033 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2034 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2035 | if (tmp_page->index == expected_index) { |
2036 | contig_pages++; | |
2037 | expected_index++; | |
2038 | } else | |
fb8c4b14 | 2039 | break; |
1da177e4 LT |
2040 | } |
2041 | if (contig_pages + i > num_pages) | |
2042 | contig_pages = num_pages - i; | |
2043 | ||
2044 | /* for reads over a certain size could initiate async | |
2045 | read ahead */ | |
2046 | ||
2047 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2048 | /* Read size needs to be in multiples of one page */ | |
2049 | read_size = min_t(const unsigned int, read_size, | |
2050 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2051 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2052 | read_size, contig_pages); | |
1da177e4 LT |
2053 | rc = -EAGAIN; |
2054 | while (rc == -EAGAIN) { | |
cdff08e7 | 2055 | if (open_file->invalidHandle) { |
15886177 | 2056 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2057 | if (rc != 0) |
2058 | break; | |
2059 | } | |
2060 | ||
bfa0d75a | 2061 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2062 | open_file->netfid, |
2063 | read_size, offset, | |
2064 | &bytes_read, &smb_read_data, | |
2065 | &buf_type); | |
a9d02ad4 | 2066 | /* BB more RC checks ? */ |
fb8c4b14 | 2067 | if (rc == -EAGAIN) { |
1da177e4 | 2068 | if (smb_read_data) { |
fb8c4b14 | 2069 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2070 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2071 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2072 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2073 | smb_read_data = NULL; |
2074 | } | |
2075 | } | |
2076 | } | |
2077 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2078 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2079 | break; |
2080 | } else if (bytes_read > 0) { | |
6f88cc2e | 2081 | task_io_account_read(bytes_read); |
1da177e4 LT |
2082 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2083 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2084 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2085 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2086 | |
2087 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2088 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2089 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2090 | i++; /* account for partial page */ |
2091 | ||
fb8c4b14 | 2092 | /* server copy of file can have smaller size |
1da177e4 | 2093 | than client */ |
fb8c4b14 SF |
2094 | /* BB do we need to verify this common case ? |
2095 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2096 | we will hit it on next read */ |
2097 | ||
05ac9d4b | 2098 | /* break; */ |
1da177e4 LT |
2099 | } |
2100 | } else { | |
b6b38f70 | 2101 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2102 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2103 | bytes_read, offset); |
fb8c4b14 | 2104 | /* BB turn off caching and do new lookup on |
1da177e4 | 2105 | file size at server? */ |
1da177e4 LT |
2106 | break; |
2107 | } | |
2108 | if (smb_read_data) { | |
fb8c4b14 | 2109 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2110 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2111 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2112 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2113 | smb_read_data = NULL; |
2114 | } | |
2115 | bytes_read = 0; | |
2116 | } | |
2117 | ||
1da177e4 LT |
2118 | /* need to free smb_read_data buf before exit */ |
2119 | if (smb_read_data) { | |
fb8c4b14 | 2120 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2121 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2122 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2123 | cifs_buf_release(smb_read_data); |
1da177e4 | 2124 | smb_read_data = NULL; |
fb8c4b14 | 2125 | } |
1da177e4 | 2126 | |
56698236 | 2127 | read_complete: |
1da177e4 LT |
2128 | FreeXid(xid); |
2129 | return rc; | |
2130 | } | |
2131 | ||
2132 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2133 | loff_t *poffset) | |
2134 | { | |
2135 | char *read_data; | |
2136 | int rc; | |
2137 | ||
56698236 SJ |
2138 | /* Is the page cached? */ |
2139 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2140 | if (rc == 0) | |
2141 | goto read_complete; | |
2142 | ||
1da177e4 LT |
2143 | page_cache_get(page); |
2144 | read_data = kmap(page); | |
2145 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2146 | |
1da177e4 | 2147 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2148 | |
1da177e4 LT |
2149 | if (rc < 0) |
2150 | goto io_error; | |
2151 | else | |
b6b38f70 | 2152 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2153 | |
e6a00296 JJS |
2154 | file->f_path.dentry->d_inode->i_atime = |
2155 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2156 | |
1da177e4 LT |
2157 | if (PAGE_CACHE_SIZE > rc) |
2158 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2159 | ||
2160 | flush_dcache_page(page); | |
2161 | SetPageUptodate(page); | |
9dc06558 SJ |
2162 | |
2163 | /* send this page to the cache */ | |
2164 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2165 | ||
1da177e4 | 2166 | rc = 0; |
fb8c4b14 | 2167 | |
1da177e4 | 2168 | io_error: |
fb8c4b14 | 2169 | kunmap(page); |
1da177e4 | 2170 | page_cache_release(page); |
56698236 SJ |
2171 | |
2172 | read_complete: | |
1da177e4 LT |
2173 | return rc; |
2174 | } | |
2175 | ||
2176 | static int cifs_readpage(struct file *file, struct page *page) | |
2177 | { | |
2178 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2179 | int rc = -EACCES; | |
2180 | int xid; | |
2181 | ||
2182 | xid = GetXid(); | |
2183 | ||
2184 | if (file->private_data == NULL) { | |
0f3bc09e | 2185 | rc = -EBADF; |
1da177e4 | 2186 | FreeXid(xid); |
0f3bc09e | 2187 | return rc; |
1da177e4 LT |
2188 | } |
2189 | ||
b6b38f70 JP |
2190 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2191 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2192 | |
2193 | rc = cifs_readpage_worker(file, page, &offset); | |
2194 | ||
2195 | unlock_page(page); | |
2196 | ||
2197 | FreeXid(xid); | |
2198 | return rc; | |
2199 | } | |
2200 | ||
a403a0a3 SF |
2201 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2202 | { | |
2203 | struct cifsFileInfo *open_file; | |
2204 | ||
4477288a | 2205 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2206 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2207 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2208 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2209 | return 1; |
2210 | } | |
2211 | } | |
4477288a | 2212 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2213 | return 0; |
2214 | } | |
2215 | ||
1da177e4 LT |
2216 | /* We do not want to update the file size from server for inodes |
2217 | open for write - to avoid races with writepage extending | |
2218 | the file - in the future we could consider allowing | |
fb8c4b14 | 2219 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2220 | but this is tricky to do without racing with writebehind |
2221 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2222 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2223 | { |
a403a0a3 | 2224 | if (!cifsInode) |
4b18f2a9 | 2225 | return true; |
50c2f753 | 2226 | |
a403a0a3 SF |
2227 | if (is_inode_writable(cifsInode)) { |
2228 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2229 | struct cifs_sb_info *cifs_sb; |
2230 | ||
c32a0b68 | 2231 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2232 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2233 | /* since no page cache to corrupt on directio |
c32a0b68 | 2234 | we can change size safely */ |
4b18f2a9 | 2235 | return true; |
c32a0b68 SF |
2236 | } |
2237 | ||
fb8c4b14 | 2238 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2239 | return true; |
7ba52631 | 2240 | |
4b18f2a9 | 2241 | return false; |
23e7dd7d | 2242 | } else |
4b18f2a9 | 2243 | return true; |
1da177e4 LT |
2244 | } |
2245 | ||
d9414774 NP |
2246 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2247 | loff_t pos, unsigned len, unsigned flags, | |
2248 | struct page **pagep, void **fsdata) | |
1da177e4 | 2249 | { |
d9414774 NP |
2250 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2251 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2252 | loff_t page_start = pos & PAGE_MASK; |
2253 | loff_t i_size; | |
2254 | struct page *page; | |
2255 | int rc = 0; | |
d9414774 | 2256 | |
b6b38f70 | 2257 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2258 | |
54566b2c | 2259 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2260 | if (!page) { |
2261 | rc = -ENOMEM; | |
2262 | goto out; | |
2263 | } | |
8a236264 | 2264 | |
a98ee8c1 JL |
2265 | if (PageUptodate(page)) |
2266 | goto out; | |
8a236264 | 2267 | |
a98ee8c1 JL |
2268 | /* |
2269 | * If we write a full page it will be up to date, no need to read from | |
2270 | * the server. If the write is short, we'll end up doing a sync write | |
2271 | * instead. | |
2272 | */ | |
2273 | if (len == PAGE_CACHE_SIZE) | |
2274 | goto out; | |
8a236264 | 2275 | |
a98ee8c1 JL |
2276 | /* |
2277 | * optimize away the read when we have an oplock, and we're not | |
2278 | * expecting to use any of the data we'd be reading in. That | |
2279 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2280 | * and the write will cover all of the existing data. | |
2281 | */ | |
2282 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2283 | i_size = i_size_read(mapping->host); | |
2284 | if (page_start >= i_size || | |
2285 | (offset == 0 && (pos + len) >= i_size)) { | |
2286 | zero_user_segments(page, 0, offset, | |
2287 | offset + len, | |
2288 | PAGE_CACHE_SIZE); | |
2289 | /* | |
2290 | * PageChecked means that the parts of the page | |
2291 | * to which we're not writing are considered up | |
2292 | * to date. Once the data is copied to the | |
2293 | * page, it can be set uptodate. | |
2294 | */ | |
2295 | SetPageChecked(page); | |
2296 | goto out; | |
2297 | } | |
2298 | } | |
d9414774 | 2299 | |
a98ee8c1 JL |
2300 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2301 | /* | |
2302 | * might as well read a page, it is fast enough. If we get | |
2303 | * an error, we don't need to return it. cifs_write_end will | |
2304 | * do a sync write instead since PG_uptodate isn't set. | |
2305 | */ | |
2306 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2307 | } else { |
2308 | /* we could try using another file handle if there is one - | |
2309 | but how would we lock it to prevent close of that handle | |
2310 | racing with this read? In any case | |
d9414774 | 2311 | this will be written out by write_end so is fine */ |
1da177e4 | 2312 | } |
a98ee8c1 JL |
2313 | out: |
2314 | *pagep = page; | |
2315 | return rc; | |
1da177e4 LT |
2316 | } |
2317 | ||
85f2d6b4 SJ |
2318 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2319 | { | |
2320 | if (PagePrivate(page)) | |
2321 | return 0; | |
2322 | ||
2323 | return cifs_fscache_release_page(page, gfp); | |
2324 | } | |
2325 | ||
2326 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2327 | { | |
2328 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2329 | ||
2330 | if (offset == 0) | |
2331 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2332 | } | |
2333 | ||
9ad1506b PS |
2334 | static int cifs_launder_page(struct page *page) |
2335 | { | |
2336 | int rc = 0; | |
2337 | loff_t range_start = page_offset(page); | |
2338 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
2339 | struct writeback_control wbc = { | |
2340 | .sync_mode = WB_SYNC_ALL, | |
2341 | .nr_to_write = 0, | |
2342 | .range_start = range_start, | |
2343 | .range_end = range_end, | |
2344 | }; | |
2345 | ||
2346 | cFYI(1, "Launder page: %p", page); | |
2347 | ||
2348 | if (clear_page_dirty_for_io(page)) | |
2349 | rc = cifs_writepage_locked(page, &wbc); | |
2350 | ||
2351 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
2352 | return rc; | |
2353 | } | |
2354 | ||
9b646972 | 2355 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2356 | { |
2357 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2358 | oplock_break); | |
a5e18bc3 | 2359 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2360 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2361 | int rc = 0; |
3bc303c2 JL |
2362 | |
2363 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2364 | if (cinode->clientCanCacheRead) |
8737c930 | 2365 | break_lease(inode, O_RDONLY); |
d54ff732 | 2366 | else |
8737c930 | 2367 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2368 | rc = filemap_fdatawrite(inode->i_mapping); |
2369 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2370 | rc = filemap_fdatawait(inode->i_mapping); |
2371 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2372 | invalidate_remote_inode(inode); |
2373 | } | |
b6b38f70 | 2374 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2375 | } |
2376 | ||
2377 | /* | |
2378 | * releasing stale oplock after recent reconnect of smb session using | |
2379 | * a now incorrect file handle is not a data integrity issue but do | |
2380 | * not bother sending an oplock release if session to server still is | |
2381 | * disconnected since oplock already released by the server | |
2382 | */ | |
cdff08e7 | 2383 | if (!cfile->oplock_break_cancelled) { |
13cfb733 | 2384 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
12fed00d PS |
2385 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false, |
2386 | cinode->clientCanCacheRead ? 1 : 0); | |
b6b38f70 | 2387 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2388 | } |
9b646972 TH |
2389 | |
2390 | /* | |
2391 | * We might have kicked in before is_valid_oplock_break() | |
2392 | * finished grabbing reference for us. Make sure it's done by | |
6573e9b7 | 2393 | * waiting for cifs_file_list_lock. |
9b646972 | 2394 | */ |
4477288a JL |
2395 | spin_lock(&cifs_file_list_lock); |
2396 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2397 | |
2398 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2399 | } |
2400 | ||
5f6dbc9e | 2401 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2402 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2403 | { |
d7c86ff8 | 2404 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2405 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2406 | } |
2407 | ||
9b646972 | 2408 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2409 | { |
ebe2e91e JL |
2410 | struct super_block *sb = cfile->dentry->d_sb; |
2411 | ||
3bc303c2 | 2412 | cifsFileInfo_put(cfile); |
ebe2e91e | 2413 | cifs_sb_deactive(sb); |
3bc303c2 JL |
2414 | } |
2415 | ||
f5e54d6e | 2416 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2417 | .readpage = cifs_readpage, |
2418 | .readpages = cifs_readpages, | |
2419 | .writepage = cifs_writepage, | |
37c0eb46 | 2420 | .writepages = cifs_writepages, |
d9414774 NP |
2421 | .write_begin = cifs_write_begin, |
2422 | .write_end = cifs_write_end, | |
1da177e4 | 2423 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2424 | .releasepage = cifs_release_page, |
2425 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2426 | .launder_page = cifs_launder_page, |
1da177e4 | 2427 | }; |
273d81d6 DK |
2428 | |
2429 | /* | |
2430 | * cifs_readpages requires the server to support a buffer large enough to | |
2431 | * contain the header plus one complete page of data. Otherwise, we need | |
2432 | * to leave cifs_readpages out of the address space operations. | |
2433 | */ | |
f5e54d6e | 2434 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2435 | .readpage = cifs_readpage, |
2436 | .writepage = cifs_writepage, | |
2437 | .writepages = cifs_writepages, | |
d9414774 NP |
2438 | .write_begin = cifs_write_begin, |
2439 | .write_end = cifs_write_end, | |
273d81d6 | 2440 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2441 | .releasepage = cifs_release_page, |
2442 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2443 | .launder_page = cifs_launder_page, |
273d81d6 | 2444 | }; |