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Commit | Line | Data |
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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 | ||
db460242 | 107 | static inline int cifs_open_inode_helper(struct inode *inode, |
a347ecb2 | 108 | struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf, |
1da177e4 LT |
109 | char *full_path, int xid) |
110 | { | |
db460242 | 111 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
1da177e4 LT |
112 | struct timespec temp; |
113 | int rc; | |
114 | ||
1da177e4 LT |
115 | if (pCifsInode->clientCanCacheRead) { |
116 | /* we have the inode open somewhere else | |
117 | no need to discard cache data */ | |
118 | goto client_can_cache; | |
119 | } | |
120 | ||
121 | /* BB need same check in cifs_create too? */ | |
122 | /* if not oplocked, invalidate inode pages if mtime or file | |
123 | size changed */ | |
07119a4d | 124 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
db460242 JL |
125 | if (timespec_equal(&inode->i_mtime, &temp) && |
126 | (inode->i_size == | |
1da177e4 | 127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 128 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 129 | } else { |
db460242 | 130 | if (inode->i_mapping) { |
ff215713 SF |
131 | /* BB no need to lock inode until after invalidate |
132 | since namei code should already have it locked? */ | |
db460242 | 133 | rc = filemap_write_and_wait(inode->i_mapping); |
cea21805 | 134 | if (rc != 0) |
db460242 | 135 | pCifsInode->write_behind_rc = rc; |
1da177e4 | 136 | } |
b6b38f70 JP |
137 | cFYI(1, "invalidating remote inode since open detected it " |
138 | "changed"); | |
db460242 | 139 | invalidate_remote_inode(inode); |
1da177e4 LT |
140 | } |
141 | ||
142 | client_can_cache: | |
c18c842b | 143 | if (pTcon->unix_ext) |
db460242 JL |
144 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
145 | xid); | |
1da177e4 | 146 | else |
db460242 JL |
147 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
148 | xid, NULL); | |
1da177e4 | 149 | |
a347ecb2 | 150 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
4b18f2a9 SF |
151 | pCifsInode->clientCanCacheAll = true; |
152 | pCifsInode->clientCanCacheRead = true; | |
db460242 | 153 | cFYI(1, "Exclusive Oplock granted on inode %p", inode); |
a347ecb2 | 154 | } else if ((oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 155 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
156 | |
157 | return rc; | |
158 | } | |
159 | ||
608712fe JL |
160 | int cifs_posix_open(char *full_path, struct inode **pinode, |
161 | struct super_block *sb, int mode, unsigned int f_flags, | |
162 | __u32 *poplock, __u16 *pnetfid, int xid) | |
163 | { | |
164 | int rc; | |
165 | FILE_UNIX_BASIC_INFO *presp_data; | |
166 | __u32 posix_flags = 0; | |
167 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
168 | struct cifs_fattr fattr; | |
169 | struct tcon_link *tlink; | |
170 | struct cifsTconInfo *tcon; | |
171 | ||
172 | cFYI(1, "posix open %s", full_path); | |
173 | ||
174 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
175 | if (presp_data == NULL) | |
176 | return -ENOMEM; | |
177 | ||
178 | tlink = cifs_sb_tlink(cifs_sb); | |
179 | if (IS_ERR(tlink)) { | |
180 | rc = PTR_ERR(tlink); | |
181 | goto posix_open_ret; | |
182 | } | |
183 | ||
184 | tcon = tlink_tcon(tlink); | |
185 | mode &= ~current_umask(); | |
186 | ||
187 | posix_flags = cifs_posix_convert_flags(f_flags); | |
188 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
189 | poplock, full_path, cifs_sb->local_nls, | |
190 | cifs_sb->mnt_cifs_flags & | |
191 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
192 | cifs_put_tlink(tlink); | |
193 | ||
194 | if (rc) | |
195 | goto posix_open_ret; | |
196 | ||
197 | if (presp_data->Type == cpu_to_le32(-1)) | |
198 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
199 | ||
200 | if (!pinode) | |
201 | goto posix_open_ret; /* caller does not need info */ | |
202 | ||
203 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
204 | ||
205 | /* get new inode and set it up */ | |
206 | if (*pinode == NULL) { | |
207 | cifs_fill_uniqueid(sb, &fattr); | |
208 | *pinode = cifs_iget(sb, &fattr); | |
209 | if (!*pinode) { | |
210 | rc = -ENOMEM; | |
211 | goto posix_open_ret; | |
212 | } | |
213 | } else { | |
214 | cifs_fattr_to_inode(*pinode, &fattr); | |
215 | } | |
216 | ||
217 | posix_open_ret: | |
218 | kfree(presp_data); | |
219 | return rc; | |
220 | } | |
221 | ||
1da177e4 LT |
222 | int cifs_open(struct inode *inode, struct file *file) |
223 | { | |
224 | int rc = -EACCES; | |
590a3fe0 JL |
225 | int xid; |
226 | __u32 oplock; | |
1da177e4 | 227 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 228 | struct cifsTconInfo *tcon; |
7ffec372 | 229 | struct tcon_link *tlink; |
6ca9f3ba | 230 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 231 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
232 | char *full_path = NULL; |
233 | int desiredAccess; | |
234 | int disposition; | |
235 | __u16 netfid; | |
236 | FILE_ALL_INFO *buf = NULL; | |
237 | ||
238 | xid = GetXid(); | |
239 | ||
240 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
241 | tlink = cifs_sb_tlink(cifs_sb); |
242 | if (IS_ERR(tlink)) { | |
243 | FreeXid(xid); | |
244 | return PTR_ERR(tlink); | |
245 | } | |
246 | tcon = tlink_tcon(tlink); | |
1da177e4 | 247 | |
a6ce4932 | 248 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 249 | |
e6a00296 | 250 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 251 | if (full_path == NULL) { |
0f3bc09e | 252 | rc = -ENOMEM; |
232341ba | 253 | goto out; |
1da177e4 LT |
254 | } |
255 | ||
b6b38f70 JP |
256 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
257 | inode, file->f_flags, full_path); | |
276a74a4 SF |
258 | |
259 | if (oplockEnabled) | |
260 | oplock = REQ_OPLOCK; | |
261 | else | |
262 | oplock = 0; | |
263 | ||
64cc2c63 SF |
264 | if (!tcon->broken_posix_open && tcon->unix_ext && |
265 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
266 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
267 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 268 | /* can not refresh inode info since size could be stale */ |
2422f676 | 269 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 270 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 271 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 272 | if (rc == 0) { |
b6b38f70 | 273 | cFYI(1, "posix open succeeded"); |
47c78b7f | 274 | |
abfe1eed JL |
275 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, |
276 | oplock); | |
2422f676 JL |
277 | if (pCifsFile == NULL) { |
278 | CIFSSMBClose(xid, tcon, netfid); | |
279 | rc = -ENOMEM; | |
2422f676 | 280 | } |
9451a9a5 SJ |
281 | |
282 | cifs_fscache_set_inode_cookie(inode, file); | |
283 | ||
276a74a4 | 284 | goto out; |
64cc2c63 SF |
285 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
286 | if (tcon->ses->serverNOS) | |
b6b38f70 | 287 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
288 | " unexpected error on SMB posix open" |
289 | ", disabling posix open support." | |
290 | " Check if server update available.", | |
291 | tcon->ses->serverName, | |
b6b38f70 | 292 | tcon->ses->serverNOS); |
64cc2c63 | 293 | tcon->broken_posix_open = true; |
276a74a4 SF |
294 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
295 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
296 | goto out; | |
64cc2c63 SF |
297 | /* else fallthrough to retry open the old way on network i/o |
298 | or DFS errors */ | |
276a74a4 SF |
299 | } |
300 | ||
1da177e4 LT |
301 | desiredAccess = cifs_convert_flags(file->f_flags); |
302 | ||
303 | /********************************************************************* | |
304 | * open flag mapping table: | |
fb8c4b14 | 305 | * |
1da177e4 | 306 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 307 | * ---------- ---------------- |
1da177e4 LT |
308 | * O_CREAT FILE_OPEN_IF |
309 | * O_CREAT | O_EXCL FILE_CREATE | |
310 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
311 | * O_TRUNC FILE_OVERWRITE | |
312 | * none of the above FILE_OPEN | |
313 | * | |
314 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 315 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
316 | * O_CREAT | O_TRUNC is similar but truncates the existing |
317 | * file rather than creating a new file as FILE_SUPERSEDE does | |
318 | * (which uses the attributes / metadata passed in on open call) | |
319 | *? | |
fb8c4b14 | 320 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
321 | *? and the read write flags match reasonably. O_LARGEFILE |
322 | *? is irrelevant because largefile support is always used | |
323 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
324 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
325 | *********************************************************************/ | |
326 | ||
327 | disposition = cifs_get_disposition(file->f_flags); | |
328 | ||
1da177e4 LT |
329 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
330 | ||
331 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
332 | and calling get_inode_info with returned buf (at least helps | |
333 | non-Unix server case) */ | |
334 | ||
fb8c4b14 SF |
335 | /* BB we can not do this if this is the second open of a file |
336 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
337 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
338 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
339 | if (!buf) { | |
340 | rc = -ENOMEM; | |
341 | goto out; | |
342 | } | |
5bafd765 | 343 | |
a6e8a845 | 344 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
276a74a4 | 345 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 346 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
347 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
348 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
349 | else |
350 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
351 | ||
a9d02ad4 SF |
352 | if (rc == -EIO) { |
353 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 354 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
355 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
356 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
357 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
358 | } | |
1da177e4 | 359 | if (rc) { |
b6b38f70 | 360 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
361 | goto out; |
362 | } | |
3321b791 | 363 | |
a347ecb2 | 364 | rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid); |
47c78b7f JL |
365 | if (rc != 0) |
366 | goto out; | |
367 | ||
abfe1eed | 368 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 369 | if (pCifsFile == NULL) { |
1da177e4 LT |
370 | rc = -ENOMEM; |
371 | goto out; | |
372 | } | |
1da177e4 | 373 | |
9451a9a5 SJ |
374 | cifs_fscache_set_inode_cookie(inode, file); |
375 | ||
fb8c4b14 | 376 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
377 | /* time to set mode which we can not set earlier due to |
378 | problems creating new read-only files */ | |
276a74a4 | 379 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
380 | struct cifs_unix_set_info_args args = { |
381 | .mode = inode->i_mode, | |
382 | .uid = NO_CHANGE_64, | |
383 | .gid = NO_CHANGE_64, | |
384 | .ctime = NO_CHANGE_64, | |
385 | .atime = NO_CHANGE_64, | |
386 | .mtime = NO_CHANGE_64, | |
387 | .device = 0, | |
388 | }; | |
01ea95e3 JL |
389 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
390 | cifs_sb->local_nls, | |
391 | cifs_sb->mnt_cifs_flags & | |
737b758c | 392 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
393 | } |
394 | } | |
395 | ||
396 | out: | |
397 | kfree(buf); | |
398 | kfree(full_path); | |
399 | FreeXid(xid); | |
7ffec372 | 400 | cifs_put_tlink(tlink); |
1da177e4 LT |
401 | return rc; |
402 | } | |
403 | ||
0418726b | 404 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
405 | /* to server was lost */ |
406 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
407 | { | |
408 | int rc = 0; | |
409 | ||
410 | /* BB list all locks open on this file and relock */ | |
411 | ||
412 | return rc; | |
413 | } | |
414 | ||
15886177 | 415 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
416 | { |
417 | int rc = -EACCES; | |
590a3fe0 JL |
418 | int xid; |
419 | __u32 oplock; | |
1da177e4 | 420 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 421 | struct cifsTconInfo *tcon; |
1da177e4 | 422 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 423 | struct inode *inode; |
1da177e4 LT |
424 | char *full_path = NULL; |
425 | int desiredAccess; | |
426 | int disposition = FILE_OPEN; | |
427 | __u16 netfid; | |
428 | ||
1da177e4 | 429 | xid = GetXid(); |
f0a71eb8 | 430 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 431 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 432 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 433 | rc = 0; |
1da177e4 | 434 | FreeXid(xid); |
0f3bc09e | 435 | return rc; |
1da177e4 LT |
436 | } |
437 | ||
15886177 | 438 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 439 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 440 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 441 | |
1da177e4 LT |
442 | /* can not grab rename sem here because various ops, including |
443 | those that already have the rename sem can end up causing writepage | |
444 | to get called and if the server was down that means we end up here, | |
445 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 446 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 447 | if (full_path == NULL) { |
3a9f462f | 448 | rc = -ENOMEM; |
f0a71eb8 | 449 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 450 | FreeXid(xid); |
3a9f462f | 451 | return rc; |
1da177e4 LT |
452 | } |
453 | ||
b6b38f70 | 454 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 455 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
456 | |
457 | if (oplockEnabled) | |
458 | oplock = REQ_OPLOCK; | |
459 | else | |
4b18f2a9 | 460 | oplock = 0; |
1da177e4 | 461 | |
7fc8f4e9 SF |
462 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
463 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
464 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
465 | |
466 | /* | |
467 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
468 | * original open. Must mask them off for a reopen. | |
469 | */ | |
15886177 JL |
470 | unsigned int oflags = pCifsFile->f_flags & |
471 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 472 | |
2422f676 | 473 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
474 | cifs_sb->mnt_file_mode /* ignored */, |
475 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 476 | if (rc == 0) { |
b6b38f70 | 477 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
478 | goto reopen_success; |
479 | } | |
480 | /* fallthrough to retry open the old way on errors, especially | |
481 | in the reconnect path it is important to retry hard */ | |
482 | } | |
483 | ||
15886177 | 484 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 485 | |
1da177e4 | 486 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
487 | by SMBOpen and then calling get_inode_info with returned buf |
488 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
489 | and server version of file size can be stale. If we knew for sure |
490 | that inode was not dirty locally we could do this */ | |
491 | ||
7fc8f4e9 | 492 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 493 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 494 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 495 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 496 | if (rc) { |
f0a71eb8 | 497 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
498 | cFYI(1, "cifs_open returned 0x%x", rc); |
499 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
500 | goto reopen_error_exit; |
501 | } | |
502 | ||
7fc8f4e9 | 503 | reopen_success: |
15886177 JL |
504 | pCifsFile->netfid = netfid; |
505 | pCifsFile->invalidHandle = false; | |
506 | mutex_unlock(&pCifsFile->fh_mutex); | |
507 | pCifsInode = CIFS_I(inode); | |
508 | ||
509 | if (can_flush) { | |
510 | rc = filemap_write_and_wait(inode->i_mapping); | |
511 | if (rc != 0) | |
512 | CIFS_I(inode)->write_behind_rc = rc; | |
513 | ||
514 | pCifsInode->clientCanCacheAll = false; | |
515 | pCifsInode->clientCanCacheRead = false; | |
516 | if (tcon->unix_ext) | |
517 | rc = cifs_get_inode_info_unix(&inode, | |
518 | full_path, inode->i_sb, xid); | |
519 | else | |
520 | rc = cifs_get_inode_info(&inode, | |
521 | full_path, NULL, inode->i_sb, | |
522 | xid, NULL); | |
523 | } /* else we are writing out data to server already | |
524 | and could deadlock if we tried to flush data, and | |
525 | since we do not know if we have data that would | |
526 | invalidate the current end of file on the server | |
527 | we can not go to the server to get the new inod | |
528 | info */ | |
529 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
530 | pCifsInode->clientCanCacheAll = true; | |
531 | pCifsInode->clientCanCacheRead = true; | |
532 | cFYI(1, "Exclusive Oplock granted on inode %p", | |
533 | pCifsFile->dentry->d_inode); | |
534 | } else if ((oplock & 0xF) == OPLOCK_READ) { | |
535 | pCifsInode->clientCanCacheRead = true; | |
536 | pCifsInode->clientCanCacheAll = false; | |
537 | } else { | |
538 | pCifsInode->clientCanCacheRead = false; | |
539 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 540 | } |
15886177 JL |
541 | cifs_relock_file(pCifsFile); |
542 | ||
543 | reopen_error_exit: | |
1da177e4 LT |
544 | kfree(full_path); |
545 | FreeXid(xid); | |
546 | return rc; | |
547 | } | |
548 | ||
549 | int cifs_close(struct inode *inode, struct file *file) | |
550 | { | |
551 | int rc = 0; | |
15745320 | 552 | int xid, timeout; |
1da177e4 LT |
553 | struct cifs_sb_info *cifs_sb; |
554 | struct cifsTconInfo *pTcon; | |
c21dfb69 | 555 | struct cifsFileInfo *pSMBFile = file->private_data; |
1da177e4 LT |
556 | |
557 | xid = GetXid(); | |
558 | ||
559 | cifs_sb = CIFS_SB(inode->i_sb); | |
13cfb733 | 560 | pTcon = tlink_tcon(pSMBFile->tlink); |
1da177e4 | 561 | if (pSMBFile) { |
7ee1af76 | 562 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 563 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 564 | pSMBFile->closePend = true; |
1da177e4 LT |
565 | if (pTcon) { |
566 | /* no sense reconnecting to close a file that is | |
567 | already closed */ | |
3b795210 | 568 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 569 | write_unlock(&GlobalSMBSeslock); |
15745320 | 570 | timeout = 2; |
6ab409b5 | 571 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 572 | && (timeout <= 2048)) { |
23e7dd7d SF |
573 | /* Give write a better chance to get to |
574 | server ahead of the close. We do not | |
575 | want to add a wait_q here as it would | |
576 | increase the memory utilization as | |
577 | the struct would be in each open file, | |
fb8c4b14 | 578 | but this should give enough time to |
23e7dd7d | 579 | clear the socket */ |
b6b38f70 | 580 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
581 | msleep(timeout); |
582 | timeout *= 4; | |
4891d539 | 583 | } |
ddb4cbfc SF |
584 | if (!pTcon->need_reconnect && |
585 | !pSMBFile->invalidHandle) | |
586 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 587 | pSMBFile->netfid); |
ddb4cbfc SF |
588 | } else |
589 | write_unlock(&GlobalSMBSeslock); | |
590 | } else | |
591 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
592 | |
593 | /* Delete any outstanding lock records. | |
594 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 595 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
596 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
597 | list_del(&li->llist); | |
598 | kfree(li); | |
599 | } | |
796e5661 | 600 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 601 | |
cbe0476f | 602 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
603 | list_del(&pSMBFile->flist); |
604 | list_del(&pSMBFile->tlist); | |
cbe0476f | 605 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 606 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
607 | file->private_data = NULL; |
608 | } else | |
609 | rc = -EBADF; | |
610 | ||
4efa53f0 | 611 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 612 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 613 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
614 | /* if the file is not open we do not know if we can cache info |
615 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
616 | CIFS_I(inode)->clientCanCacheRead = false; |
617 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 618 | } |
4efa53f0 | 619 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 620 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
621 | rc = CIFS_I(inode)->write_behind_rc; |
622 | FreeXid(xid); | |
623 | return rc; | |
624 | } | |
625 | ||
626 | int cifs_closedir(struct inode *inode, struct file *file) | |
627 | { | |
628 | int rc = 0; | |
629 | int xid; | |
c21dfb69 | 630 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
631 | char *ptmp; |
632 | ||
b6b38f70 | 633 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
634 | |
635 | xid = GetXid(); | |
636 | ||
637 | if (pCFileStruct) { | |
13cfb733 | 638 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 639 | |
b6b38f70 | 640 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 641 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
642 | if (!pCFileStruct->srch_inf.endOfSearch && |
643 | !pCFileStruct->invalidHandle) { | |
644 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 645 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 646 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
647 | cFYI(1, "Closing uncompleted readdir with rc %d", |
648 | rc); | |
1da177e4 LT |
649 | /* not much we can do if it fails anyway, ignore rc */ |
650 | rc = 0; | |
ddb4cbfc SF |
651 | } else |
652 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
653 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
654 | if (ptmp) { | |
b6b38f70 | 655 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 656 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 657 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
658 | cifs_small_buf_release(ptmp); |
659 | else | |
660 | cifs_buf_release(ptmp); | |
1da177e4 | 661 | } |
13cfb733 | 662 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
663 | kfree(file->private_data); |
664 | file->private_data = NULL; | |
665 | } | |
666 | /* BB can we lock the filestruct while this is going on? */ | |
667 | FreeXid(xid); | |
668 | return rc; | |
669 | } | |
670 | ||
7ee1af76 JA |
671 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
672 | __u64 offset, __u8 lockType) | |
673 | { | |
fb8c4b14 SF |
674 | struct cifsLockInfo *li = |
675 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
676 | if (li == NULL) |
677 | return -ENOMEM; | |
678 | li->offset = offset; | |
679 | li->length = len; | |
680 | li->type = lockType; | |
796e5661 | 681 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 682 | list_add(&li->llist, &fid->llist); |
796e5661 | 683 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
684 | return 0; |
685 | } | |
686 | ||
1da177e4 LT |
687 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
688 | { | |
689 | int rc, xid; | |
1da177e4 LT |
690 | __u32 numLock = 0; |
691 | __u32 numUnlock = 0; | |
692 | __u64 length; | |
4b18f2a9 | 693 | bool wait_flag = false; |
1da177e4 | 694 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 695 | struct cifsTconInfo *tcon; |
08547b03 SF |
696 | __u16 netfid; |
697 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 698 | bool posix_locking = 0; |
1da177e4 LT |
699 | |
700 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
701 | rc = -EACCES; | |
702 | xid = GetXid(); | |
703 | ||
b6b38f70 | 704 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 705 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 706 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 707 | pfLock->fl_end); |
1da177e4 LT |
708 | |
709 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 710 | cFYI(1, "Posix"); |
1da177e4 | 711 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 712 | cFYI(1, "Flock"); |
1da177e4 | 713 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 714 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 715 | wait_flag = true; |
1da177e4 LT |
716 | } |
717 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
718 | cFYI(1, "Process suspended by mandatory locking - " |
719 | "not implemented yet"); | |
1da177e4 | 720 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 721 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 722 | if (pfLock->fl_flags & |
1da177e4 | 723 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 724 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
725 | |
726 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 727 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
728 | numLock = 1; |
729 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 730 | cFYI(1, "F_UNLCK"); |
1da177e4 | 731 | numUnlock = 1; |
d47d7c1a SF |
732 | /* Check if unlock includes more than |
733 | one lock range */ | |
1da177e4 | 734 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 735 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
736 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
737 | numLock = 1; | |
738 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 739 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
740 | numLock = 1; |
741 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 742 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
743 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
744 | numLock = 1; | |
745 | } else | |
b6b38f70 | 746 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 747 | |
e6a00296 | 748 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 749 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
1da177e4 LT |
750 | |
751 | if (file->private_data == NULL) { | |
0f3bc09e | 752 | rc = -EBADF; |
1da177e4 | 753 | FreeXid(xid); |
0f3bc09e | 754 | return rc; |
1da177e4 | 755 | } |
08547b03 SF |
756 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
757 | ||
13a6e42a SF |
758 | if ((tcon->ses->capabilities & CAP_UNIX) && |
759 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 760 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 761 | posix_locking = 1; |
08547b03 SF |
762 | /* BB add code here to normalize offset and length to |
763 | account for negative length which we can not accept over the | |
764 | wire */ | |
1da177e4 | 765 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 766 | if (posix_locking) { |
08547b03 | 767 | int posix_lock_type; |
fb8c4b14 | 768 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
769 | posix_lock_type = CIFS_RDLCK; |
770 | else | |
771 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 772 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 773 | length, pfLock, |
08547b03 SF |
774 | posix_lock_type, wait_flag); |
775 | FreeXid(xid); | |
776 | return rc; | |
777 | } | |
778 | ||
779 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 780 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 781 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 782 | if (rc == 0) { |
13a6e42a | 783 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
784 | pfLock->fl_start, 1 /* numUnlock */ , |
785 | 0 /* numLock */ , lockType, | |
786 | 0 /* wait flag */ ); | |
787 | pfLock->fl_type = F_UNLCK; | |
788 | if (rc != 0) | |
b6b38f70 JP |
789 | cERROR(1, "Error unlocking previously locked " |
790 | "range %d during test of lock", rc); | |
1da177e4 LT |
791 | rc = 0; |
792 | ||
793 | } else { | |
794 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
795 | rc = 0; |
796 | ||
797 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
798 | pfLock->fl_type = F_WRLCK; | |
799 | } else { | |
800 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
801 | pfLock->fl_start, 0, 1, | |
802 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
803 | 0 /* wait flag */); | |
804 | if (rc == 0) { | |
805 | rc = CIFSSMBLock(xid, tcon, netfid, | |
806 | length, pfLock->fl_start, 1, 0, | |
807 | lockType | | |
808 | LOCKING_ANDX_SHARED_LOCK, | |
809 | 0 /* wait flag */); | |
810 | pfLock->fl_type = F_RDLCK; | |
811 | if (rc != 0) | |
f19159dc | 812 | cERROR(1, "Error unlocking " |
f05337c6 | 813 | "previously locked range %d " |
f19159dc | 814 | "during test of lock", rc); |
f05337c6 PS |
815 | rc = 0; |
816 | } else { | |
817 | pfLock->fl_type = F_WRLCK; | |
818 | rc = 0; | |
819 | } | |
820 | } | |
1da177e4 LT |
821 | } |
822 | ||
823 | FreeXid(xid); | |
824 | return rc; | |
825 | } | |
7ee1af76 JA |
826 | |
827 | if (!numLock && !numUnlock) { | |
828 | /* if no lock or unlock then nothing | |
829 | to do since we do not know what it is */ | |
830 | FreeXid(xid); | |
831 | return -EOPNOTSUPP; | |
832 | } | |
833 | ||
834 | if (posix_locking) { | |
08547b03 | 835 | int posix_lock_type; |
fb8c4b14 | 836 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
837 | posix_lock_type = CIFS_RDLCK; |
838 | else | |
839 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 840 | |
fb8c4b14 | 841 | if (numUnlock == 1) |
beb84dc8 | 842 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 843 | |
13a6e42a | 844 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 845 | length, pfLock, |
08547b03 | 846 | posix_lock_type, wait_flag); |
7ee1af76 | 847 | } else { |
c21dfb69 | 848 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
849 | |
850 | if (numLock) { | |
13a6e42a | 851 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 852 | pfLock->fl_start, |
7ee1af76 JA |
853 | 0, numLock, lockType, wait_flag); |
854 | ||
855 | if (rc == 0) { | |
856 | /* For Windows locks we must store them. */ | |
857 | rc = store_file_lock(fid, length, | |
858 | pfLock->fl_start, lockType); | |
859 | } | |
860 | } else if (numUnlock) { | |
861 | /* For each stored lock that this unlock overlaps | |
862 | completely, unlock it. */ | |
863 | int stored_rc = 0; | |
864 | struct cifsLockInfo *li, *tmp; | |
865 | ||
6b70c955 | 866 | rc = 0; |
796e5661 | 867 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
868 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
869 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 870 | (pfLock->fl_start + length) >= |
39db810c | 871 | (li->offset + li->length)) { |
13a6e42a | 872 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 873 | netfid, |
7ee1af76 | 874 | li->length, li->offset, |
4b18f2a9 | 875 | 1, 0, li->type, false); |
7ee1af76 JA |
876 | if (stored_rc) |
877 | rc = stored_rc; | |
2c964d1f PS |
878 | else { |
879 | list_del(&li->llist); | |
880 | kfree(li); | |
881 | } | |
7ee1af76 JA |
882 | } |
883 | } | |
796e5661 | 884 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
885 | } |
886 | } | |
887 | ||
d634cc15 | 888 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
889 | posix_lock_file_wait(file, pfLock); |
890 | FreeXid(xid); | |
891 | return rc; | |
892 | } | |
893 | ||
fbec9ab9 JL |
894 | /* |
895 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
896 | * these calls can be very long. | |
897 | * | |
898 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
899 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
900 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
901 | * welcome if someone wants to suggest one. | |
902 | * | |
903 | * We may be able to do a better job with this if there were some way to | |
904 | * declare that a file should be sparse. | |
905 | */ | |
906 | static int | |
907 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
908 | { | |
909 | if (offset <= cifsi->server_eof) | |
910 | return CIFS_STD_OP; | |
911 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
912 | return CIFS_VLONG_OP; | |
913 | else | |
914 | return CIFS_LONG_OP; | |
915 | } | |
916 | ||
917 | /* update the file size (if needed) after a write */ | |
918 | static void | |
919 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
920 | unsigned int bytes_written) | |
921 | { | |
922 | loff_t end_of_write = offset + bytes_written; | |
923 | ||
924 | if (end_of_write > cifsi->server_eof) | |
925 | cifsi->server_eof = end_of_write; | |
926 | } | |
927 | ||
1da177e4 LT |
928 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
929 | size_t write_size, loff_t *poffset) | |
930 | { | |
931 | int rc = 0; | |
932 | unsigned int bytes_written = 0; | |
933 | unsigned int total_written; | |
934 | struct cifs_sb_info *cifs_sb; | |
935 | struct cifsTconInfo *pTcon; | |
936 | int xid, long_op; | |
937 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 938 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 939 | |
e6a00296 | 940 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 941 | |
b6b38f70 JP |
942 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
943 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
944 | |
945 | if (file->private_data == NULL) | |
946 | return -EBADF; | |
ba00ba64 | 947 | |
c21dfb69 | 948 | open_file = file->private_data; |
13cfb733 | 949 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 950 | |
838726c4 JL |
951 | rc = generic_write_checks(file, poffset, &write_size, 0); |
952 | if (rc) | |
953 | return rc; | |
954 | ||
1da177e4 | 955 | xid = GetXid(); |
1da177e4 | 956 | |
fbec9ab9 | 957 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
958 | for (total_written = 0; write_size > total_written; |
959 | total_written += bytes_written) { | |
960 | rc = -EAGAIN; | |
961 | while (rc == -EAGAIN) { | |
962 | if (file->private_data == NULL) { | |
963 | /* file has been closed on us */ | |
964 | FreeXid(xid); | |
965 | /* if we have gotten here we have written some data | |
966 | and blocked, and the file has been freed on us while | |
967 | we blocked so return what we managed to write */ | |
968 | return total_written; | |
fb8c4b14 | 969 | } |
1da177e4 LT |
970 | if (open_file->closePend) { |
971 | FreeXid(xid); | |
972 | if (total_written) | |
973 | return total_written; | |
974 | else | |
975 | return -EBADF; | |
976 | } | |
977 | if (open_file->invalidHandle) { | |
1da177e4 LT |
978 | /* we could deadlock if we called |
979 | filemap_fdatawait from here so tell | |
980 | reopen_file not to flush data to server | |
981 | now */ | |
15886177 | 982 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
983 | if (rc != 0) |
984 | break; | |
985 | } | |
986 | ||
987 | rc = CIFSSMBWrite(xid, pTcon, | |
988 | open_file->netfid, | |
989 | min_t(const int, cifs_sb->wsize, | |
990 | write_size - total_written), | |
991 | *poffset, &bytes_written, | |
992 | NULL, write_data + total_written, long_op); | |
993 | } | |
994 | if (rc || (bytes_written == 0)) { | |
995 | if (total_written) | |
996 | break; | |
997 | else { | |
998 | FreeXid(xid); | |
999 | return rc; | |
1000 | } | |
fbec9ab9 JL |
1001 | } else { |
1002 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1003 | *poffset += bytes_written; |
fbec9ab9 | 1004 | } |
133672ef | 1005 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1006 | 15 seconds is plenty */ |
1007 | } | |
1008 | ||
a4544347 | 1009 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1010 | |
1011 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1012 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1013 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1014 | /* Do not update local mtime - server will set its actual value on write |
1015 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1016 | * current_fs_time(inode->i_sb);*/ |
1017 | if (total_written > 0) { | |
1018 | spin_lock(&inode->i_lock); | |
1019 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1020 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1021 | *poffset); |
3677db10 | 1022 | spin_unlock(&inode->i_lock); |
1da177e4 | 1023 | } |
fb8c4b14 | 1024 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1025 | } |
1026 | FreeXid(xid); | |
1027 | return total_written; | |
1028 | } | |
1029 | ||
1030 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1031 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1032 | { |
1033 | int rc = 0; | |
1034 | unsigned int bytes_written = 0; | |
1035 | unsigned int total_written; | |
1036 | struct cifs_sb_info *cifs_sb; | |
1037 | struct cifsTconInfo *pTcon; | |
1038 | int xid, long_op; | |
1039 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1040 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1041 | |
e6a00296 | 1042 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1043 | |
b6b38f70 JP |
1044 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1045 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1046 | |
1047 | if (file->private_data == NULL) | |
1048 | return -EBADF; | |
c21dfb69 | 1049 | open_file = file->private_data; |
13cfb733 | 1050 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 1051 | |
1da177e4 | 1052 | xid = GetXid(); |
1da177e4 | 1053 | |
fbec9ab9 | 1054 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1055 | for (total_written = 0; write_size > total_written; |
1056 | total_written += bytes_written) { | |
1057 | rc = -EAGAIN; | |
1058 | while (rc == -EAGAIN) { | |
1059 | if (file->private_data == NULL) { | |
1060 | /* file has been closed on us */ | |
1061 | FreeXid(xid); | |
1062 | /* if we have gotten here we have written some data | |
1063 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1064 | while we blocked so return what we managed to |
1da177e4 LT |
1065 | write */ |
1066 | return total_written; | |
fb8c4b14 | 1067 | } |
1da177e4 LT |
1068 | if (open_file->closePend) { |
1069 | FreeXid(xid); | |
1070 | if (total_written) | |
1071 | return total_written; | |
1072 | else | |
1073 | return -EBADF; | |
1074 | } | |
1075 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1076 | /* we could deadlock if we called |
1077 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1078 | reopen_file not to flush data to |
1da177e4 | 1079 | server now */ |
15886177 | 1080 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1081 | if (rc != 0) |
1082 | break; | |
1083 | } | |
fb8c4b14 SF |
1084 | if (experimEnabled || (pTcon->ses->server && |
1085 | ((pTcon->ses->server->secMode & | |
08775834 | 1086 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1087 | == 0))) { |
3e84469d SF |
1088 | struct kvec iov[2]; |
1089 | unsigned int len; | |
1090 | ||
0ae0efad | 1091 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1092 | write_size - total_written); |
1093 | /* iov[0] is reserved for smb header */ | |
1094 | iov[1].iov_base = (char *)write_data + | |
1095 | total_written; | |
1096 | iov[1].iov_len = len; | |
d6e04ae6 | 1097 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1098 | open_file->netfid, len, |
d6e04ae6 | 1099 | *poffset, &bytes_written, |
3e84469d | 1100 | iov, 1, long_op); |
d6e04ae6 | 1101 | } else |
60808233 SF |
1102 | rc = CIFSSMBWrite(xid, pTcon, |
1103 | open_file->netfid, | |
1104 | min_t(const int, cifs_sb->wsize, | |
1105 | write_size - total_written), | |
1106 | *poffset, &bytes_written, | |
1107 | write_data + total_written, | |
1108 | NULL, long_op); | |
1da177e4 LT |
1109 | } |
1110 | if (rc || (bytes_written == 0)) { | |
1111 | if (total_written) | |
1112 | break; | |
1113 | else { | |
1114 | FreeXid(xid); | |
1115 | return rc; | |
1116 | } | |
fbec9ab9 JL |
1117 | } else { |
1118 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1119 | *poffset += bytes_written; |
fbec9ab9 | 1120 | } |
133672ef | 1121 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1122 | 15 seconds is plenty */ |
1123 | } | |
1124 | ||
a4544347 | 1125 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1126 | |
1127 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1128 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1129 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1130 | /* file->f_path.dentry->d_inode->i_ctime = |
1131 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1132 | if (total_written > 0) { | |
1133 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1134 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1135 | i_size_write(file->f_path.dentry->d_inode, | |
1136 | *poffset); | |
1137 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1138 | } |
3677db10 | 1139 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1140 | } |
1141 | FreeXid(xid); | |
1142 | return total_written; | |
1143 | } | |
1144 | ||
630f3f0c | 1145 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
6508d904 JL |
1146 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1147 | bool fsuid_only) | |
630f3f0c SF |
1148 | { |
1149 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1150 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1151 | ||
1152 | /* only filter by fsuid on multiuser mounts */ | |
1153 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1154 | fsuid_only = false; | |
630f3f0c SF |
1155 | |
1156 | read_lock(&GlobalSMBSeslock); | |
1157 | /* we could simply get the first_list_entry since write-only entries | |
1158 | are always at the end of the list but since the first entry might | |
1159 | have a close pending, we go through the whole list */ | |
1160 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1161 | if (open_file->closePend) | |
1162 | continue; | |
6508d904 JL |
1163 | if (fsuid_only && open_file->uid != current_fsuid()) |
1164 | continue; | |
630f3f0c SF |
1165 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || |
1166 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1167 | if (!open_file->invalidHandle) { | |
1168 | /* found a good file */ | |
1169 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1170 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1171 | read_unlock(&GlobalSMBSeslock); |
1172 | return open_file; | |
1173 | } /* else might as well continue, and look for | |
1174 | another, or simply have the caller reopen it | |
1175 | again rather than trying to fix this handle */ | |
1176 | } else /* write only file */ | |
1177 | break; /* write only files are last so must be done */ | |
1178 | } | |
1179 | read_unlock(&GlobalSMBSeslock); | |
1180 | return NULL; | |
1181 | } | |
1182 | #endif | |
1183 | ||
6508d904 JL |
1184 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1185 | bool fsuid_only) | |
6148a742 SF |
1186 | { |
1187 | struct cifsFileInfo *open_file; | |
6508d904 | 1188 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
2846d386 | 1189 | bool any_available = false; |
dd99cd80 | 1190 | int rc; |
6148a742 | 1191 | |
60808233 SF |
1192 | /* Having a null inode here (because mapping->host was set to zero by |
1193 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1194 | it being zero) during stress testcases so we need to check for it */ | |
1195 | ||
fb8c4b14 | 1196 | if (cifs_inode == NULL) { |
b6b38f70 | 1197 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1198 | dump_stack(); |
1199 | return NULL; | |
1200 | } | |
1201 | ||
6508d904 JL |
1202 | /* only filter by fsuid on multiuser mounts */ |
1203 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1204 | fsuid_only = false; | |
1205 | ||
6148a742 | 1206 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1207 | refind_writable: |
6148a742 | 1208 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1209 | if (open_file->closePend) |
1210 | continue; | |
1211 | if (!any_available && open_file->pid != current->tgid) | |
1212 | continue; | |
1213 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 SF |
1214 | continue; |
1215 | if (open_file->pfile && | |
1216 | ((open_file->pfile->f_flags & O_RDWR) || | |
1217 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1218 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1219 | |
1220 | if (!open_file->invalidHandle) { | |
1221 | /* found a good writable file */ | |
1222 | read_unlock(&GlobalSMBSeslock); | |
1223 | return open_file; | |
1224 | } | |
8840dee9 | 1225 | |
6148a742 | 1226 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1227 | /* Had to unlock since following call can block */ |
15886177 | 1228 | rc = cifs_reopen_file(open_file, false); |
8840dee9 | 1229 | if (!rc) { |
9b22b0b7 SF |
1230 | if (!open_file->closePend) |
1231 | return open_file; | |
1232 | else { /* start over in case this was deleted */ | |
1233 | /* since the list could be modified */ | |
37c0eb46 | 1234 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1235 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1236 | goto refind_writable; |
37c0eb46 SF |
1237 | } |
1238 | } | |
9b22b0b7 SF |
1239 | |
1240 | /* if it fails, try another handle if possible - | |
1241 | (we can not do this if closePending since | |
1242 | loop could be modified - in which case we | |
1243 | have to start at the beginning of the list | |
1244 | again. Note that it would be bad | |
1245 | to hold up writepages here (rather than | |
1246 | in caller) with continuous retries */ | |
b6b38f70 | 1247 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1248 | read_lock(&GlobalSMBSeslock); |
1249 | /* can not use this handle, no write | |
1250 | pending on this one after all */ | |
6ab409b5 | 1251 | cifsFileInfo_put(open_file); |
8840dee9 | 1252 | |
9b22b0b7 SF |
1253 | if (open_file->closePend) /* list could have changed */ |
1254 | goto refind_writable; | |
1255 | /* else we simply continue to the next entry. Thus | |
1256 | we do not loop on reopen errors. If we | |
1257 | can not reopen the file, for example if we | |
1258 | reconnected to a server with another client | |
1259 | racing to delete or lock the file we would not | |
1260 | make progress if we restarted before the beginning | |
1261 | of the loop here. */ | |
6148a742 SF |
1262 | } |
1263 | } | |
2846d386 JL |
1264 | /* couldn't find useable FH with same pid, try any available */ |
1265 | if (!any_available) { | |
1266 | any_available = true; | |
1267 | goto refind_writable; | |
1268 | } | |
6148a742 SF |
1269 | read_unlock(&GlobalSMBSeslock); |
1270 | return NULL; | |
1271 | } | |
1272 | ||
1da177e4 LT |
1273 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1274 | { | |
1275 | struct address_space *mapping = page->mapping; | |
1276 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1277 | char *write_data; | |
1278 | int rc = -EFAULT; | |
1279 | int bytes_written = 0; | |
1280 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1281 | struct inode *inode; |
6148a742 | 1282 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1283 | |
1284 | if (!mapping || !mapping->host) | |
1285 | return -EFAULT; | |
1286 | ||
1287 | inode = page->mapping->host; | |
1288 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1289 | |
1290 | offset += (loff_t)from; | |
1291 | write_data = kmap(page); | |
1292 | write_data += from; | |
1293 | ||
1294 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1295 | kunmap(page); | |
1296 | return -EIO; | |
1297 | } | |
1298 | ||
1299 | /* racing with truncate? */ | |
1300 | if (offset > mapping->host->i_size) { | |
1301 | kunmap(page); | |
1302 | return 0; /* don't care */ | |
1303 | } | |
1304 | ||
1305 | /* check to make sure that we are not extending the file */ | |
1306 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1307 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1308 | |
6508d904 | 1309 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 SF |
1310 | if (open_file) { |
1311 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1312 | to-from, &offset); | |
6ab409b5 | 1313 | cifsFileInfo_put(open_file); |
1da177e4 | 1314 | /* Does mm or vfs already set times? */ |
6148a742 | 1315 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1316 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1317 | rc = 0; |
bb5a9a04 SF |
1318 | else if (bytes_written < 0) |
1319 | rc = bytes_written; | |
6148a742 | 1320 | } else { |
b6b38f70 | 1321 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1322 | rc = -EIO; |
1323 | } | |
1324 | ||
1325 | kunmap(page); | |
1326 | return rc; | |
1327 | } | |
1328 | ||
1da177e4 | 1329 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1330 | struct writeback_control *wbc) |
1da177e4 | 1331 | { |
37c0eb46 SF |
1332 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1333 | unsigned int bytes_to_write; | |
1334 | unsigned int bytes_written; | |
1335 | struct cifs_sb_info *cifs_sb; | |
1336 | int done = 0; | |
111ebb6e | 1337 | pgoff_t end; |
37c0eb46 | 1338 | pgoff_t index; |
fb8c4b14 SF |
1339 | int range_whole = 0; |
1340 | struct kvec *iov; | |
84d2f07e | 1341 | int len; |
37c0eb46 SF |
1342 | int n_iov = 0; |
1343 | pgoff_t next; | |
1344 | int nr_pages; | |
1345 | __u64 offset = 0; | |
23e7dd7d | 1346 | struct cifsFileInfo *open_file; |
ba00ba64 | 1347 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1348 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1349 | struct page *page; |
1350 | struct pagevec pvec; | |
1351 | int rc = 0; | |
1352 | int scanned = 0; | |
fbec9ab9 | 1353 | int xid, long_op; |
1da177e4 | 1354 | |
f3983c21 JL |
1355 | /* |
1356 | * BB: Is this meaningful for a non-block-device file system? | |
1357 | * If it is, we should test it again after we do I/O | |
1358 | */ | |
1359 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1360 | wbc->encountered_congestion = 1; | |
1361 | return 0; | |
1362 | } | |
1363 | ||
37c0eb46 | 1364 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1365 | |
37c0eb46 SF |
1366 | /* |
1367 | * If wsize is smaller that the page cache size, default to writing | |
1368 | * one page at a time via cifs_writepage | |
1369 | */ | |
1370 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1371 | return generic_writepages(mapping, wbc); | |
1372 | ||
9a0c8230 | 1373 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1374 | if (iov == NULL) |
9a0c8230 SF |
1375 | return generic_writepages(mapping, wbc); |
1376 | ||
37c0eb46 | 1377 | /* |
f3983c21 JL |
1378 | * if there's no open file, then this is likely to fail too, |
1379 | * but it'll at least handle the return. Maybe it should be | |
1380 | * a BUG() instead? | |
37c0eb46 | 1381 | */ |
6508d904 | 1382 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1383 | if (!open_file) { |
9a0c8230 | 1384 | kfree(iov); |
f3983c21 JL |
1385 | return generic_writepages(mapping, wbc); |
1386 | } | |
1387 | ||
13cfb733 | 1388 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1389 | if (!experimEnabled && tcon->ses->server->secMode & |
1390 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1391 | cifsFileInfo_put(open_file); | |
1392 | return generic_writepages(mapping, wbc); | |
37c0eb46 | 1393 | } |
f3983c21 | 1394 | cifsFileInfo_put(open_file); |
37c0eb46 | 1395 | |
1da177e4 LT |
1396 | xid = GetXid(); |
1397 | ||
37c0eb46 | 1398 | pagevec_init(&pvec, 0); |
111ebb6e | 1399 | if (wbc->range_cyclic) { |
37c0eb46 | 1400 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1401 | end = -1; |
1402 | } else { | |
1403 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1404 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1405 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1406 | range_whole = 1; | |
37c0eb46 SF |
1407 | scanned = 1; |
1408 | } | |
1409 | retry: | |
1410 | while (!done && (index <= end) && | |
1411 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1412 | PAGECACHE_TAG_DIRTY, | |
1413 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1414 | int first; | |
1415 | unsigned int i; | |
1416 | ||
37c0eb46 SF |
1417 | first = -1; |
1418 | next = 0; | |
1419 | n_iov = 0; | |
1420 | bytes_to_write = 0; | |
1421 | ||
1422 | for (i = 0; i < nr_pages; i++) { | |
1423 | page = pvec.pages[i]; | |
1424 | /* | |
1425 | * At this point we hold neither mapping->tree_lock nor | |
1426 | * lock on the page itself: the page may be truncated or | |
1427 | * invalidated (changing page->mapping to NULL), or even | |
1428 | * swizzled back from swapper_space to tmpfs file | |
1429 | * mapping | |
1430 | */ | |
1431 | ||
1432 | if (first < 0) | |
1433 | lock_page(page); | |
529ae9aa | 1434 | else if (!trylock_page(page)) |
37c0eb46 SF |
1435 | break; |
1436 | ||
1437 | if (unlikely(page->mapping != mapping)) { | |
1438 | unlock_page(page); | |
1439 | break; | |
1440 | } | |
1441 | ||
111ebb6e | 1442 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1443 | done = 1; |
1444 | unlock_page(page); | |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | if (next && (page->index != next)) { | |
1449 | /* Not next consecutive page */ | |
1450 | unlock_page(page); | |
1451 | break; | |
1452 | } | |
1453 | ||
1454 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1455 | wait_on_page_writeback(page); | |
1456 | ||
1457 | if (PageWriteback(page) || | |
cb876f45 | 1458 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1459 | unlock_page(page); |
1460 | break; | |
1461 | } | |
84d2f07e | 1462 | |
cb876f45 LT |
1463 | /* |
1464 | * This actually clears the dirty bit in the radix tree. | |
1465 | * See cifs_writepage() for more commentary. | |
1466 | */ | |
1467 | set_page_writeback(page); | |
1468 | ||
84d2f07e SF |
1469 | if (page_offset(page) >= mapping->host->i_size) { |
1470 | done = 1; | |
1471 | unlock_page(page); | |
cb876f45 | 1472 | end_page_writeback(page); |
84d2f07e SF |
1473 | break; |
1474 | } | |
1475 | ||
37c0eb46 SF |
1476 | /* |
1477 | * BB can we get rid of this? pages are held by pvec | |
1478 | */ | |
1479 | page_cache_get(page); | |
1480 | ||
84d2f07e SF |
1481 | len = min(mapping->host->i_size - page_offset(page), |
1482 | (loff_t)PAGE_CACHE_SIZE); | |
1483 | ||
37c0eb46 SF |
1484 | /* reserve iov[0] for the smb header */ |
1485 | n_iov++; | |
1486 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1487 | iov[n_iov].iov_len = len; |
1488 | bytes_to_write += len; | |
37c0eb46 SF |
1489 | |
1490 | if (first < 0) { | |
1491 | first = i; | |
1492 | offset = page_offset(page); | |
1493 | } | |
1494 | next = page->index + 1; | |
1495 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1496 | break; | |
1497 | } | |
1498 | if (n_iov) { | |
6508d904 JL |
1499 | open_file = find_writable_file(CIFS_I(mapping->host), |
1500 | false); | |
23e7dd7d | 1501 | if (!open_file) { |
b6b38f70 | 1502 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1503 | rc = -EBADF; |
1047abc1 | 1504 | } else { |
fbec9ab9 | 1505 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1506 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1507 | bytes_to_write, offset, |
1508 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1509 | long_op); |
6ab409b5 | 1510 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1511 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1512 | } |
fbec9ab9 | 1513 | |
f3983c21 JL |
1514 | if (rc || bytes_written < bytes_to_write) { |
1515 | cERROR(1, "Write2 ret %d, wrote %d", | |
1516 | rc, bytes_written); | |
1517 | /* BB what if continued retry is | |
1518 | requested via mount flags? */ | |
1519 | if (rc == -ENOSPC) | |
1520 | set_bit(AS_ENOSPC, &mapping->flags); | |
1521 | else | |
1522 | set_bit(AS_EIO, &mapping->flags); | |
1523 | } else { | |
1524 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1525 | } |
f3983c21 | 1526 | |
37c0eb46 SF |
1527 | for (i = 0; i < n_iov; i++) { |
1528 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1529 | /* Should we also set page error on |
1530 | success rc but too little data written? */ | |
1531 | /* BB investigate retry logic on temporary | |
1532 | server crash cases and how recovery works | |
fb8c4b14 SF |
1533 | when page marked as error */ |
1534 | if (rc) | |
eb9bdaa3 | 1535 | SetPageError(page); |
37c0eb46 SF |
1536 | kunmap(page); |
1537 | unlock_page(page); | |
cb876f45 | 1538 | end_page_writeback(page); |
37c0eb46 SF |
1539 | page_cache_release(page); |
1540 | } | |
1541 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1542 | done = 1; | |
1543 | index = next; | |
b066a48c DK |
1544 | } else |
1545 | /* Need to re-find the pages we skipped */ | |
1546 | index = pvec.pages[0]->index + 1; | |
1547 | ||
37c0eb46 SF |
1548 | pagevec_release(&pvec); |
1549 | } | |
1550 | if (!scanned && !done) { | |
1551 | /* | |
1552 | * We hit the last page and there is more work to be done: wrap | |
1553 | * back to the start of the file | |
1554 | */ | |
1555 | scanned = 1; | |
1556 | index = 0; | |
1557 | goto retry; | |
1558 | } | |
111ebb6e | 1559 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1560 | mapping->writeback_index = index; |
1561 | ||
1da177e4 | 1562 | FreeXid(xid); |
9a0c8230 | 1563 | kfree(iov); |
1da177e4 LT |
1564 | return rc; |
1565 | } | |
1da177e4 | 1566 | |
fb8c4b14 | 1567 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1568 | { |
1569 | int rc = -EFAULT; | |
1570 | int xid; | |
1571 | ||
1572 | xid = GetXid(); | |
1573 | /* BB add check for wbc flags */ | |
1574 | page_cache_get(page); | |
ad7a2926 | 1575 | if (!PageUptodate(page)) |
b6b38f70 | 1576 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1577 | |
1578 | /* | |
1579 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1580 | * | |
1581 | * A writepage() implementation always needs to do either this, | |
1582 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1583 | * the case of a failure. | |
1584 | * | |
1585 | * Just unlocking the page will cause the radix tree tag-bits | |
1586 | * to fail to update with the state of the page correctly. | |
1587 | */ | |
fb8c4b14 | 1588 | set_page_writeback(page); |
1da177e4 LT |
1589 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1590 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1591 | unlock_page(page); | |
cb876f45 LT |
1592 | end_page_writeback(page); |
1593 | page_cache_release(page); | |
1da177e4 LT |
1594 | FreeXid(xid); |
1595 | return rc; | |
1596 | } | |
1597 | ||
d9414774 NP |
1598 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1599 | loff_t pos, unsigned len, unsigned copied, | |
1600 | struct page *page, void *fsdata) | |
1da177e4 | 1601 | { |
d9414774 NP |
1602 | int rc; |
1603 | struct inode *inode = mapping->host; | |
1da177e4 | 1604 | |
b6b38f70 JP |
1605 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1606 | page, pos, copied); | |
d9414774 | 1607 | |
a98ee8c1 JL |
1608 | if (PageChecked(page)) { |
1609 | if (copied == len) | |
1610 | SetPageUptodate(page); | |
1611 | ClearPageChecked(page); | |
1612 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1613 | SetPageUptodate(page); |
ad7a2926 | 1614 | |
1da177e4 | 1615 | if (!PageUptodate(page)) { |
d9414774 NP |
1616 | char *page_data; |
1617 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1618 | int xid; | |
1619 | ||
1620 | xid = GetXid(); | |
1da177e4 LT |
1621 | /* this is probably better than directly calling |
1622 | partialpage_write since in this function the file handle is | |
1623 | known which we might as well leverage */ | |
1624 | /* BB check if anything else missing out of ppw | |
1625 | such as updating last write time */ | |
1626 | page_data = kmap(page); | |
d9414774 NP |
1627 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1628 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1629 | kunmap(page); |
d9414774 NP |
1630 | |
1631 | FreeXid(xid); | |
fb8c4b14 | 1632 | } else { |
d9414774 NP |
1633 | rc = copied; |
1634 | pos += copied; | |
1da177e4 LT |
1635 | set_page_dirty(page); |
1636 | } | |
1637 | ||
d9414774 NP |
1638 | if (rc > 0) { |
1639 | spin_lock(&inode->i_lock); | |
1640 | if (pos > inode->i_size) | |
1641 | i_size_write(inode, pos); | |
1642 | spin_unlock(&inode->i_lock); | |
1643 | } | |
1644 | ||
1645 | unlock_page(page); | |
1646 | page_cache_release(page); | |
1647 | ||
1da177e4 LT |
1648 | return rc; |
1649 | } | |
1650 | ||
7ea80859 | 1651 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1652 | { |
1653 | int xid; | |
1654 | int rc = 0; | |
b298f223 | 1655 | struct cifsTconInfo *tcon; |
c21dfb69 | 1656 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1657 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1658 | |
1659 | xid = GetXid(); | |
1660 | ||
b6b38f70 | 1661 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1662 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1663 | |
cea21805 JL |
1664 | rc = filemap_write_and_wait(inode->i_mapping); |
1665 | if (rc == 0) { | |
1666 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1667 | CIFS_I(inode)->write_behind_rc = 0; |
13cfb733 | 1668 | tcon = tlink_tcon(smbfile->tlink); |
be652445 | 1669 | if (!rc && tcon && smbfile && |
4717bed6 | 1670 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1671 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1672 | } |
b298f223 | 1673 | |
1da177e4 LT |
1674 | FreeXid(xid); |
1675 | return rc; | |
1676 | } | |
1677 | ||
3978d717 | 1678 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1679 | { |
1680 | struct address_space *mapping; | |
1681 | struct inode *inode; | |
1682 | unsigned long index = page->index; | |
1683 | unsigned int rpages = 0; | |
1684 | int rc = 0; | |
1685 | ||
f19159dc | 1686 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1687 | mapping = page->mapping; |
1688 | if (!mapping) | |
1689 | return 0; | |
1690 | inode = mapping->host; | |
1691 | if (!inode) | |
3978d717 | 1692 | return; */ |
1da177e4 | 1693 | |
fb8c4b14 | 1694 | /* fill in rpages then |
1da177e4 LT |
1695 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1696 | ||
b6b38f70 | 1697 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1698 | |
3978d717 | 1699 | #if 0 |
1da177e4 LT |
1700 | if (rc < 0) |
1701 | return rc; | |
1702 | return 0; | |
3978d717 | 1703 | #endif |
1da177e4 LT |
1704 | } */ |
1705 | ||
1706 | /* | |
1707 | * As file closes, flush all cached write data for this inode checking | |
1708 | * for write behind errors. | |
1709 | */ | |
75e1fcc0 | 1710 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1711 | { |
fb8c4b14 | 1712 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1713 | int rc = 0; |
1714 | ||
1715 | /* Rather than do the steps manually: | |
1716 | lock the inode for writing | |
1717 | loop through pages looking for write behind data (dirty pages) | |
1718 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1719 | send to server (prefer in parallel) | |
1720 | deal with writebehind errors | |
1721 | unlock inode for writing | |
1722 | filemapfdatawrite appears easier for the time being */ | |
1723 | ||
1724 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1725 | /* reset wb rc if we were able to write out dirty pages */ |
1726 | if (!rc) { | |
1727 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1728 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1729 | } |
50c2f753 | 1730 | |
b6b38f70 | 1731 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1732 | |
1733 | return rc; | |
1734 | } | |
1735 | ||
1736 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1737 | size_t read_size, loff_t *poffset) | |
1738 | { | |
1739 | int rc = -EACCES; | |
1740 | unsigned int bytes_read = 0; | |
1741 | unsigned int total_read = 0; | |
1742 | unsigned int current_read_size; | |
1743 | struct cifs_sb_info *cifs_sb; | |
1744 | struct cifsTconInfo *pTcon; | |
1745 | int xid; | |
1746 | struct cifsFileInfo *open_file; | |
1747 | char *smb_read_data; | |
1748 | char __user *current_offset; | |
1749 | struct smb_com_read_rsp *pSMBr; | |
1750 | ||
1751 | xid = GetXid(); | |
e6a00296 | 1752 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1753 | |
1754 | if (file->private_data == NULL) { | |
0f3bc09e | 1755 | rc = -EBADF; |
1da177e4 | 1756 | FreeXid(xid); |
0f3bc09e | 1757 | return rc; |
1da177e4 | 1758 | } |
c21dfb69 | 1759 | open_file = file->private_data; |
13cfb733 | 1760 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1761 | |
ad7a2926 | 1762 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1763 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1764 | |
1da177e4 LT |
1765 | for (total_read = 0, current_offset = read_data; |
1766 | read_size > total_read; | |
1767 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1768 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1769 | cifs_sb->rsize); |
1770 | rc = -EAGAIN; | |
1771 | smb_read_data = NULL; | |
1772 | while (rc == -EAGAIN) { | |
ec637e3f | 1773 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1774 | if ((open_file->invalidHandle) && |
1da177e4 | 1775 | (!open_file->closePend)) { |
15886177 | 1776 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1777 | if (rc != 0) |
1778 | break; | |
1779 | } | |
bfa0d75a | 1780 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1781 | open_file->netfid, |
1782 | current_read_size, *poffset, | |
1783 | &bytes_read, &smb_read_data, | |
1784 | &buf_type); | |
1da177e4 | 1785 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1786 | if (smb_read_data) { |
93544cc6 SF |
1787 | if (copy_to_user(current_offset, |
1788 | smb_read_data + | |
1789 | 4 /* RFC1001 length field */ + | |
1790 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1791 | bytes_read)) |
93544cc6 | 1792 | rc = -EFAULT; |
93544cc6 | 1793 | |
fb8c4b14 | 1794 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1795 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1796 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1797 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1798 | smb_read_data = NULL; |
1799 | } | |
1800 | } | |
1801 | if (rc || (bytes_read == 0)) { | |
1802 | if (total_read) { | |
1803 | break; | |
1804 | } else { | |
1805 | FreeXid(xid); | |
1806 | return rc; | |
1807 | } | |
1808 | } else { | |
a4544347 | 1809 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1810 | *poffset += bytes_read; |
1811 | } | |
1812 | } | |
1813 | FreeXid(xid); | |
1814 | return total_read; | |
1815 | } | |
1816 | ||
1817 | ||
1818 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1819 | loff_t *poffset) | |
1820 | { | |
1821 | int rc = -EACCES; | |
1822 | unsigned int bytes_read = 0; | |
1823 | unsigned int total_read; | |
1824 | unsigned int current_read_size; | |
1825 | struct cifs_sb_info *cifs_sb; | |
1826 | struct cifsTconInfo *pTcon; | |
1827 | int xid; | |
1828 | char *current_offset; | |
1829 | struct cifsFileInfo *open_file; | |
ec637e3f | 1830 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1831 | |
1832 | xid = GetXid(); | |
e6a00296 | 1833 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1834 | |
1835 | if (file->private_data == NULL) { | |
0f3bc09e | 1836 | rc = -EBADF; |
1da177e4 | 1837 | FreeXid(xid); |
0f3bc09e | 1838 | return rc; |
1da177e4 | 1839 | } |
c21dfb69 | 1840 | open_file = file->private_data; |
13cfb733 | 1841 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1842 | |
1843 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1844 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1845 | |
fb8c4b14 | 1846 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1847 | read_size > total_read; |
1848 | total_read += bytes_read, current_offset += bytes_read) { | |
1849 | current_read_size = min_t(const int, read_size - total_read, | |
1850 | cifs_sb->rsize); | |
f9f5c817 SF |
1851 | /* For windows me and 9x we do not want to request more |
1852 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1853 | if ((pTcon->ses) && |
f9f5c817 SF |
1854 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1855 | current_read_size = min_t(const int, current_read_size, | |
1856 | pTcon->ses->server->maxBuf - 128); | |
1857 | } | |
1da177e4 LT |
1858 | rc = -EAGAIN; |
1859 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1860 | if ((open_file->invalidHandle) && |
1da177e4 | 1861 | (!open_file->closePend)) { |
15886177 | 1862 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1863 | if (rc != 0) |
1864 | break; | |
1865 | } | |
bfa0d75a | 1866 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1867 | open_file->netfid, |
1868 | current_read_size, *poffset, | |
1869 | &bytes_read, ¤t_offset, | |
1870 | &buf_type); | |
1da177e4 LT |
1871 | } |
1872 | if (rc || (bytes_read == 0)) { | |
1873 | if (total_read) { | |
1874 | break; | |
1875 | } else { | |
1876 | FreeXid(xid); | |
1877 | return rc; | |
1878 | } | |
1879 | } else { | |
a4544347 | 1880 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1881 | *poffset += bytes_read; |
1882 | } | |
1883 | } | |
1884 | FreeXid(xid); | |
1885 | return total_read; | |
1886 | } | |
1887 | ||
1888 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1889 | { | |
1da177e4 LT |
1890 | int rc, xid; |
1891 | ||
1892 | xid = GetXid(); | |
abab095d | 1893 | rc = cifs_revalidate_file(file); |
1da177e4 | 1894 | if (rc) { |
b6b38f70 | 1895 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1896 | FreeXid(xid); |
1897 | return rc; | |
1898 | } | |
1899 | rc = generic_file_mmap(file, vma); | |
1900 | FreeXid(xid); | |
1901 | return rc; | |
1902 | } | |
1903 | ||
1904 | ||
fb8c4b14 | 1905 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1906 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1907 | { |
1908 | struct page *page; | |
1909 | char *target; | |
1910 | ||
1911 | while (bytes_read > 0) { | |
1912 | if (list_empty(pages)) | |
1913 | break; | |
1914 | ||
1915 | page = list_entry(pages->prev, struct page, lru); | |
1916 | list_del(&page->lru); | |
1917 | ||
315e995c | 1918 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1919 | GFP_KERNEL)) { |
1920 | page_cache_release(page); | |
b6b38f70 | 1921 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1922 | data += PAGE_CACHE_SIZE; |
1923 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1924 | continue; |
1925 | } | |
06b43672 | 1926 | page_cache_release(page); |
1da177e4 | 1927 | |
fb8c4b14 | 1928 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1929 | |
1930 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1931 | memcpy(target, data, bytes_read); | |
1932 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1933 | memset(target + bytes_read, 0, |
1da177e4 LT |
1934 | PAGE_CACHE_SIZE - bytes_read); |
1935 | bytes_read = 0; | |
1936 | } else { | |
1937 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1938 | bytes_read -= PAGE_CACHE_SIZE; | |
1939 | } | |
1940 | kunmap_atomic(target, KM_USER0); | |
1941 | ||
1942 | flush_dcache_page(page); | |
1943 | SetPageUptodate(page); | |
1944 | unlock_page(page); | |
1da177e4 | 1945 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1946 | |
1947 | /* add page to FS-Cache */ | |
1948 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1949 | } |
1950 | return; | |
1951 | } | |
1952 | ||
1953 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1954 | struct list_head *page_list, unsigned num_pages) | |
1955 | { | |
1956 | int rc = -EACCES; | |
1957 | int xid; | |
1958 | loff_t offset; | |
1959 | struct page *page; | |
1960 | struct cifs_sb_info *cifs_sb; | |
1961 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1962 | unsigned int bytes_read = 0; |
fb8c4b14 | 1963 | unsigned int read_size, i; |
1da177e4 LT |
1964 | char *smb_read_data = NULL; |
1965 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1966 | struct cifsFileInfo *open_file; |
ec637e3f | 1967 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1968 | |
1969 | xid = GetXid(); | |
1970 | if (file->private_data == NULL) { | |
0f3bc09e | 1971 | rc = -EBADF; |
1da177e4 | 1972 | FreeXid(xid); |
0f3bc09e | 1973 | return rc; |
1da177e4 | 1974 | } |
c21dfb69 | 1975 | open_file = file->private_data; |
e6a00296 | 1976 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1977 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1978 | |
56698236 SJ |
1979 | /* |
1980 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1981 | * immediately if the cookie is negative | |
1982 | */ | |
1983 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1984 | &num_pages); | |
1985 | if (rc == 0) | |
1986 | goto read_complete; | |
1987 | ||
f19159dc | 1988 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1989 | for (i = 0; i < num_pages; ) { |
1990 | unsigned contig_pages; | |
1991 | struct page *tmp_page; | |
1992 | unsigned long expected_index; | |
1993 | ||
1994 | if (list_empty(page_list)) | |
1995 | break; | |
1996 | ||
1997 | page = list_entry(page_list->prev, struct page, lru); | |
1998 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1999 | ||
2000 | /* count adjacent pages that we will read into */ | |
2001 | contig_pages = 0; | |
fb8c4b14 | 2002 | expected_index = |
1da177e4 | 2003 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2004 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2005 | if (tmp_page->index == expected_index) { |
2006 | contig_pages++; | |
2007 | expected_index++; | |
2008 | } else | |
fb8c4b14 | 2009 | break; |
1da177e4 LT |
2010 | } |
2011 | if (contig_pages + i > num_pages) | |
2012 | contig_pages = num_pages - i; | |
2013 | ||
2014 | /* for reads over a certain size could initiate async | |
2015 | read ahead */ | |
2016 | ||
2017 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2018 | /* Read size needs to be in multiples of one page */ | |
2019 | read_size = min_t(const unsigned int, read_size, | |
2020 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2021 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2022 | read_size, contig_pages); | |
1da177e4 LT |
2023 | rc = -EAGAIN; |
2024 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2025 | if ((open_file->invalidHandle) && |
1da177e4 | 2026 | (!open_file->closePend)) { |
15886177 | 2027 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2028 | if (rc != 0) |
2029 | break; | |
2030 | } | |
2031 | ||
bfa0d75a | 2032 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2033 | open_file->netfid, |
2034 | read_size, offset, | |
2035 | &bytes_read, &smb_read_data, | |
2036 | &buf_type); | |
a9d02ad4 | 2037 | /* BB more RC checks ? */ |
fb8c4b14 | 2038 | if (rc == -EAGAIN) { |
1da177e4 | 2039 | if (smb_read_data) { |
fb8c4b14 | 2040 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2041 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2042 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2043 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2044 | smb_read_data = NULL; |
2045 | } | |
2046 | } | |
2047 | } | |
2048 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2049 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2050 | break; |
2051 | } else if (bytes_read > 0) { | |
6f88cc2e | 2052 | task_io_account_read(bytes_read); |
1da177e4 LT |
2053 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2054 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2055 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2056 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2057 | |
2058 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2059 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2060 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2061 | i++; /* account for partial page */ |
2062 | ||
fb8c4b14 | 2063 | /* server copy of file can have smaller size |
1da177e4 | 2064 | than client */ |
fb8c4b14 SF |
2065 | /* BB do we need to verify this common case ? |
2066 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2067 | we will hit it on next read */ |
2068 | ||
05ac9d4b | 2069 | /* break; */ |
1da177e4 LT |
2070 | } |
2071 | } else { | |
b6b38f70 | 2072 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2073 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2074 | bytes_read, offset); |
fb8c4b14 | 2075 | /* BB turn off caching and do new lookup on |
1da177e4 | 2076 | file size at server? */ |
1da177e4 LT |
2077 | break; |
2078 | } | |
2079 | if (smb_read_data) { | |
fb8c4b14 | 2080 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2081 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2082 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2083 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2084 | smb_read_data = NULL; |
2085 | } | |
2086 | bytes_read = 0; | |
2087 | } | |
2088 | ||
1da177e4 LT |
2089 | /* need to free smb_read_data buf before exit */ |
2090 | if (smb_read_data) { | |
fb8c4b14 | 2091 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2092 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2093 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2094 | cifs_buf_release(smb_read_data); |
1da177e4 | 2095 | smb_read_data = NULL; |
fb8c4b14 | 2096 | } |
1da177e4 | 2097 | |
56698236 | 2098 | read_complete: |
1da177e4 LT |
2099 | FreeXid(xid); |
2100 | return rc; | |
2101 | } | |
2102 | ||
2103 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2104 | loff_t *poffset) | |
2105 | { | |
2106 | char *read_data; | |
2107 | int rc; | |
2108 | ||
56698236 SJ |
2109 | /* Is the page cached? */ |
2110 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2111 | if (rc == 0) | |
2112 | goto read_complete; | |
2113 | ||
1da177e4 LT |
2114 | page_cache_get(page); |
2115 | read_data = kmap(page); | |
2116 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2117 | |
1da177e4 | 2118 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2119 | |
1da177e4 LT |
2120 | if (rc < 0) |
2121 | goto io_error; | |
2122 | else | |
b6b38f70 | 2123 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2124 | |
e6a00296 JJS |
2125 | file->f_path.dentry->d_inode->i_atime = |
2126 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2127 | |
1da177e4 LT |
2128 | if (PAGE_CACHE_SIZE > rc) |
2129 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2130 | ||
2131 | flush_dcache_page(page); | |
2132 | SetPageUptodate(page); | |
9dc06558 SJ |
2133 | |
2134 | /* send this page to the cache */ | |
2135 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2136 | ||
1da177e4 | 2137 | rc = 0; |
fb8c4b14 | 2138 | |
1da177e4 | 2139 | io_error: |
fb8c4b14 | 2140 | kunmap(page); |
1da177e4 | 2141 | page_cache_release(page); |
56698236 SJ |
2142 | |
2143 | read_complete: | |
1da177e4 LT |
2144 | return rc; |
2145 | } | |
2146 | ||
2147 | static int cifs_readpage(struct file *file, struct page *page) | |
2148 | { | |
2149 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2150 | int rc = -EACCES; | |
2151 | int xid; | |
2152 | ||
2153 | xid = GetXid(); | |
2154 | ||
2155 | if (file->private_data == NULL) { | |
0f3bc09e | 2156 | rc = -EBADF; |
1da177e4 | 2157 | FreeXid(xid); |
0f3bc09e | 2158 | return rc; |
1da177e4 LT |
2159 | } |
2160 | ||
b6b38f70 JP |
2161 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2162 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2163 | |
2164 | rc = cifs_readpage_worker(file, page, &offset); | |
2165 | ||
2166 | unlock_page(page); | |
2167 | ||
2168 | FreeXid(xid); | |
2169 | return rc; | |
2170 | } | |
2171 | ||
a403a0a3 SF |
2172 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2173 | { | |
2174 | struct cifsFileInfo *open_file; | |
2175 | ||
2176 | read_lock(&GlobalSMBSeslock); | |
2177 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2178 | if (open_file->closePend) | |
2179 | continue; | |
2180 | if (open_file->pfile && | |
2181 | ((open_file->pfile->f_flags & O_RDWR) || | |
2182 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2183 | read_unlock(&GlobalSMBSeslock); | |
2184 | return 1; | |
2185 | } | |
2186 | } | |
2187 | read_unlock(&GlobalSMBSeslock); | |
2188 | return 0; | |
2189 | } | |
2190 | ||
1da177e4 LT |
2191 | /* We do not want to update the file size from server for inodes |
2192 | open for write - to avoid races with writepage extending | |
2193 | the file - in the future we could consider allowing | |
fb8c4b14 | 2194 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2195 | but this is tricky to do without racing with writebehind |
2196 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2197 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2198 | { |
a403a0a3 | 2199 | if (!cifsInode) |
4b18f2a9 | 2200 | return true; |
50c2f753 | 2201 | |
a403a0a3 SF |
2202 | if (is_inode_writable(cifsInode)) { |
2203 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2204 | struct cifs_sb_info *cifs_sb; |
2205 | ||
c32a0b68 | 2206 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2207 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2208 | /* since no page cache to corrupt on directio |
c32a0b68 | 2209 | we can change size safely */ |
4b18f2a9 | 2210 | return true; |
c32a0b68 SF |
2211 | } |
2212 | ||
fb8c4b14 | 2213 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2214 | return true; |
7ba52631 | 2215 | |
4b18f2a9 | 2216 | return false; |
23e7dd7d | 2217 | } else |
4b18f2a9 | 2218 | return true; |
1da177e4 LT |
2219 | } |
2220 | ||
d9414774 NP |
2221 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2222 | loff_t pos, unsigned len, unsigned flags, | |
2223 | struct page **pagep, void **fsdata) | |
1da177e4 | 2224 | { |
d9414774 NP |
2225 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2226 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2227 | loff_t page_start = pos & PAGE_MASK; |
2228 | loff_t i_size; | |
2229 | struct page *page; | |
2230 | int rc = 0; | |
d9414774 | 2231 | |
b6b38f70 | 2232 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2233 | |
54566b2c | 2234 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2235 | if (!page) { |
2236 | rc = -ENOMEM; | |
2237 | goto out; | |
2238 | } | |
8a236264 | 2239 | |
a98ee8c1 JL |
2240 | if (PageUptodate(page)) |
2241 | goto out; | |
8a236264 | 2242 | |
a98ee8c1 JL |
2243 | /* |
2244 | * If we write a full page it will be up to date, no need to read from | |
2245 | * the server. If the write is short, we'll end up doing a sync write | |
2246 | * instead. | |
2247 | */ | |
2248 | if (len == PAGE_CACHE_SIZE) | |
2249 | goto out; | |
8a236264 | 2250 | |
a98ee8c1 JL |
2251 | /* |
2252 | * optimize away the read when we have an oplock, and we're not | |
2253 | * expecting to use any of the data we'd be reading in. That | |
2254 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2255 | * and the write will cover all of the existing data. | |
2256 | */ | |
2257 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2258 | i_size = i_size_read(mapping->host); | |
2259 | if (page_start >= i_size || | |
2260 | (offset == 0 && (pos + len) >= i_size)) { | |
2261 | zero_user_segments(page, 0, offset, | |
2262 | offset + len, | |
2263 | PAGE_CACHE_SIZE); | |
2264 | /* | |
2265 | * PageChecked means that the parts of the page | |
2266 | * to which we're not writing are considered up | |
2267 | * to date. Once the data is copied to the | |
2268 | * page, it can be set uptodate. | |
2269 | */ | |
2270 | SetPageChecked(page); | |
2271 | goto out; | |
2272 | } | |
2273 | } | |
d9414774 | 2274 | |
a98ee8c1 JL |
2275 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2276 | /* | |
2277 | * might as well read a page, it is fast enough. If we get | |
2278 | * an error, we don't need to return it. cifs_write_end will | |
2279 | * do a sync write instead since PG_uptodate isn't set. | |
2280 | */ | |
2281 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2282 | } else { |
2283 | /* we could try using another file handle if there is one - | |
2284 | but how would we lock it to prevent close of that handle | |
2285 | racing with this read? In any case | |
d9414774 | 2286 | this will be written out by write_end so is fine */ |
1da177e4 | 2287 | } |
a98ee8c1 JL |
2288 | out: |
2289 | *pagep = page; | |
2290 | return rc; | |
1da177e4 LT |
2291 | } |
2292 | ||
85f2d6b4 SJ |
2293 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2294 | { | |
2295 | if (PagePrivate(page)) | |
2296 | return 0; | |
2297 | ||
2298 | return cifs_fscache_release_page(page, gfp); | |
2299 | } | |
2300 | ||
2301 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2302 | { | |
2303 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2304 | ||
2305 | if (offset == 0) | |
2306 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2307 | } | |
2308 | ||
9b646972 | 2309 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2310 | { |
2311 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2312 | oplock_break); | |
a5e18bc3 | 2313 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2314 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3bc303c2 JL |
2315 | int rc, waitrc = 0; |
2316 | ||
2317 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2318 | if (cinode->clientCanCacheRead) |
8737c930 | 2319 | break_lease(inode, O_RDONLY); |
d54ff732 | 2320 | else |
8737c930 | 2321 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2322 | rc = filemap_fdatawrite(inode->i_mapping); |
2323 | if (cinode->clientCanCacheRead == 0) { | |
2324 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2325 | invalidate_remote_inode(inode); | |
2326 | } | |
2327 | if (!rc) | |
2328 | rc = waitrc; | |
2329 | if (rc) | |
2330 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2331 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2332 | } |
2333 | ||
2334 | /* | |
2335 | * releasing stale oplock after recent reconnect of smb session using | |
2336 | * a now incorrect file handle is not a data integrity issue but do | |
2337 | * not bother sending an oplock release if session to server still is | |
2338 | * disconnected since oplock already released by the server | |
2339 | */ | |
2340 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
13cfb733 JL |
2341 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2342 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2343 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2344 | } |
9b646972 TH |
2345 | |
2346 | /* | |
2347 | * We might have kicked in before is_valid_oplock_break() | |
2348 | * finished grabbing reference for us. Make sure it's done by | |
2349 | * waiting for GlobalSMSSeslock. | |
2350 | */ | |
2351 | write_lock(&GlobalSMBSeslock); | |
2352 | write_unlock(&GlobalSMBSeslock); | |
2353 | ||
2354 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2355 | } |
2356 | ||
9b646972 | 2357 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2358 | { |
d7c86ff8 | 2359 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2360 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2361 | } |
2362 | ||
9b646972 | 2363 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2364 | { |
3bc303c2 | 2365 | cifsFileInfo_put(cfile); |
d7c86ff8 | 2366 | cifs_sb_deactive(cfile->dentry->d_sb); |
3bc303c2 JL |
2367 | } |
2368 | ||
f5e54d6e | 2369 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2370 | .readpage = cifs_readpage, |
2371 | .readpages = cifs_readpages, | |
2372 | .writepage = cifs_writepage, | |
37c0eb46 | 2373 | .writepages = cifs_writepages, |
d9414774 NP |
2374 | .write_begin = cifs_write_begin, |
2375 | .write_end = cifs_write_end, | |
1da177e4 | 2376 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2377 | .releasepage = cifs_release_page, |
2378 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2379 | /* .sync_page = cifs_sync_page, */ |
2380 | /* .direct_IO = */ | |
2381 | }; | |
273d81d6 DK |
2382 | |
2383 | /* | |
2384 | * cifs_readpages requires the server to support a buffer large enough to | |
2385 | * contain the header plus one complete page of data. Otherwise, we need | |
2386 | * to leave cifs_readpages out of the address space operations. | |
2387 | */ | |
f5e54d6e | 2388 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2389 | .readpage = cifs_readpage, |
2390 | .writepage = cifs_writepage, | |
2391 | .writepages = cifs_writepages, | |
d9414774 NP |
2392 | .write_begin = cifs_write_begin, |
2393 | .write_end = cifs_write_end, | |
273d81d6 | 2394 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2395 | .releasepage = cifs_release_page, |
2396 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2397 | /* .sync_page = cifs_sync_page, */ |
2398 | /* .direct_IO = */ | |
2399 | }; |