Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
43 | ||
1da177e4 LT |
44 | static inline int cifs_convert_flags(unsigned int flags) |
45 | { | |
46 | if ((flags & O_ACCMODE) == O_RDONLY) | |
47 | return GENERIC_READ; | |
48 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
49 | return GENERIC_WRITE; | |
50 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
51 | /* GENERIC_ALL is too much permission to request | |
52 | can cause unnecessary access denied on create */ | |
53 | /* return GENERIC_ALL; */ | |
54 | return (GENERIC_READ | GENERIC_WRITE); | |
55 | } | |
56 | ||
e10f7b55 JL |
57 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
58 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
59 | FILE_READ_DATA); | |
7fc8f4e9 | 60 | } |
e10f7b55 | 61 | |
7fc8f4e9 SF |
62 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
63 | { | |
64 | fmode_t posix_flags = 0; | |
e10f7b55 | 65 | |
7fc8f4e9 SF |
66 | if ((flags & O_ACCMODE) == O_RDONLY) |
67 | posix_flags = FMODE_READ; | |
68 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
69 | posix_flags = FMODE_WRITE; | |
70 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
71 | /* GENERIC_ALL is too much permission to request | |
72 | can cause unnecessary access denied on create */ | |
73 | /* return GENERIC_ALL; */ | |
74 | posix_flags = FMODE_READ | FMODE_WRITE; | |
75 | } | |
76 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
77 | reopening a file. They had their effect on the original open */ | |
78 | if (flags & O_APPEND) | |
79 | posix_flags |= (fmode_t)O_APPEND; | |
6b2f3d1f CH |
80 | if (flags & O_DSYNC) |
81 | posix_flags |= (fmode_t)O_DSYNC; | |
82 | if (flags & __O_SYNC) | |
83 | posix_flags |= (fmode_t)__O_SYNC; | |
7fc8f4e9 SF |
84 | if (flags & O_DIRECTORY) |
85 | posix_flags |= (fmode_t)O_DIRECTORY; | |
86 | if (flags & O_NOFOLLOW) | |
87 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
88 | if (flags & O_DIRECT) | |
89 | posix_flags |= (fmode_t)O_DIRECT; | |
90 | ||
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
276a74a4 | 108 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
109 | static inline int |
110 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
111 | struct cifsInodeInfo *pCifsInode, | |
112 | struct cifsFileInfo *pCifsFile, __u32 oplock, | |
113 | u16 netfid) | |
276a74a4 | 114 | { |
276a74a4 | 115 | |
276a74a4 | 116 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
117 | |
118 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
119 | if (pCifsInode == NULL) { | |
120 | write_unlock(&GlobalSMBSeslock); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
276a74a4 SF |
124 | if (pCifsInode->clientCanCacheRead) { |
125 | /* we have the inode open somewhere else | |
126 | no need to discard cache data */ | |
127 | goto psx_client_can_cache; | |
128 | } | |
129 | ||
130 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
131 | BB fIX following section BB FIXME */ | |
132 | ||
133 | /* if not oplocked, invalidate inode pages if mtime or file | |
134 | size changed */ | |
135 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
136 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
137 | (file->f_path.dentry->d_inode->i_size == | |
138 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
b6b38f70 | 139 | cFYI(1, "inode unchanged on server"); |
276a74a4 SF |
140 | } else { |
141 | if (file->f_path.dentry->d_inode->i_mapping) { | |
142 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
143 | if (rc != 0) | |
144 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
145 | } | |
b6b38f70 JP |
146 | cFYI(1, "invalidating remote inode since open detected it " |
147 | "changed"); | |
276a74a4 SF |
148 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
149 | } */ | |
150 | ||
151 | psx_client_can_cache: | |
152 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
153 | pCifsInode->clientCanCacheAll = true; | |
154 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
155 | cFYI(1, "Exclusive Oplock granted on inode %p", |
156 | file->f_path.dentry->d_inode); | |
276a74a4 SF |
157 | } else if ((oplock & 0xF) == OPLOCK_READ) |
158 | pCifsInode->clientCanCacheRead = true; | |
159 | ||
160 | /* will have to change the unlock if we reenable the | |
161 | filemap_fdatawrite (which does not seem necessary */ | |
162 | write_unlock(&GlobalSMBSeslock); | |
163 | return 0; | |
164 | } | |
165 | ||
703a3b8e SF |
166 | static struct cifsFileInfo * |
167 | cifs_fill_filedata(struct file *file) | |
168 | { | |
169 | struct list_head *tmp; | |
170 | struct cifsFileInfo *pCifsFile = NULL; | |
171 | struct cifsInodeInfo *pCifsInode = NULL; | |
172 | ||
173 | /* search inode for this file and fill in file->private_data */ | |
174 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
175 | read_lock(&GlobalSMBSeslock); | |
176 | list_for_each(tmp, &pCifsInode->openFileList) { | |
177 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
178 | if ((pCifsFile->pfile == NULL) && | |
179 | (pCifsFile->pid == current->tgid)) { | |
180 | /* mode set in cifs_create */ | |
181 | ||
182 | /* needed for writepage */ | |
183 | pCifsFile->pfile = file; | |
184 | file->private_data = pCifsFile; | |
185 | break; | |
186 | } | |
187 | } | |
188 | read_unlock(&GlobalSMBSeslock); | |
189 | ||
190 | if (file->private_data != NULL) { | |
191 | return pCifsFile; | |
192 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
b6b38f70 JP |
193 | cERROR(1, "could not find file instance for " |
194 | "new file %p", file); | |
703a3b8e SF |
195 | return NULL; |
196 | } | |
197 | ||
1da177e4 LT |
198 | /* all arguments to this function must be checked for validity in caller */ |
199 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
200 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
201 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
202 | char *full_path, int xid) | |
203 | { | |
204 | struct timespec temp; | |
205 | int rc; | |
206 | ||
1da177e4 LT |
207 | if (pCifsInode->clientCanCacheRead) { |
208 | /* we have the inode open somewhere else | |
209 | no need to discard cache data */ | |
210 | goto client_can_cache; | |
211 | } | |
212 | ||
213 | /* BB need same check in cifs_create too? */ | |
214 | /* if not oplocked, invalidate inode pages if mtime or file | |
215 | size changed */ | |
07119a4d | 216 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
217 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
218 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 | 219 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 220 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 221 | } else { |
e6a00296 | 222 | if (file->f_path.dentry->d_inode->i_mapping) { |
ff215713 SF |
223 | /* BB no need to lock inode until after invalidate |
224 | since namei code should already have it locked? */ | |
cea21805 JL |
225 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
226 | if (rc != 0) | |
227 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 | 228 | } |
b6b38f70 JP |
229 | cFYI(1, "invalidating remote inode since open detected it " |
230 | "changed"); | |
e6a00296 | 231 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
232 | } |
233 | ||
234 | client_can_cache: | |
c18c842b | 235 | if (pTcon->unix_ext) |
e6a00296 | 236 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
237 | full_path, inode->i_sb, xid); |
238 | else | |
e6a00296 | 239 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 240 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
241 | |
242 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
243 | pCifsInode->clientCanCacheAll = true; |
244 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
245 | cFYI(1, "Exclusive Oplock granted on inode %p", |
246 | file->f_path.dentry->d_inode); | |
1da177e4 | 247 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 248 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
249 | |
250 | return rc; | |
251 | } | |
252 | ||
253 | int cifs_open(struct inode *inode, struct file *file) | |
254 | { | |
255 | int rc = -EACCES; | |
590a3fe0 JL |
256 | int xid; |
257 | __u32 oplock; | |
1da177e4 | 258 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 259 | struct cifsTconInfo *tcon; |
1da177e4 LT |
260 | struct cifsFileInfo *pCifsFile; |
261 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
262 | char *full_path = NULL; |
263 | int desiredAccess; | |
264 | int disposition; | |
265 | __u16 netfid; | |
266 | FILE_ALL_INFO *buf = NULL; | |
267 | ||
268 | xid = GetXid(); | |
269 | ||
270 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 271 | tcon = cifs_sb->tcon; |
1da177e4 | 272 | |
a6ce4932 | 273 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
274 | pCifsFile = cifs_fill_filedata(file); |
275 | if (pCifsFile) { | |
0f3bc09e | 276 | rc = 0; |
a6ce4932 | 277 | FreeXid(xid); |
0f3bc09e | 278 | return rc; |
703a3b8e | 279 | } |
1da177e4 | 280 | |
e6a00296 | 281 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 282 | if (full_path == NULL) { |
0f3bc09e | 283 | rc = -ENOMEM; |
1da177e4 | 284 | FreeXid(xid); |
0f3bc09e | 285 | return rc; |
1da177e4 LT |
286 | } |
287 | ||
b6b38f70 JP |
288 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
289 | inode, file->f_flags, full_path); | |
276a74a4 SF |
290 | |
291 | if (oplockEnabled) | |
292 | oplock = REQ_OPLOCK; | |
293 | else | |
294 | oplock = 0; | |
295 | ||
64cc2c63 SF |
296 | if (!tcon->broken_posix_open && tcon->unix_ext && |
297 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
298 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
299 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
300 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
fa588e0c | 301 | oflags |= SMB_O_CREAT; |
276a74a4 | 302 | /* can not refresh inode info since size could be stale */ |
3bc303c2 | 303 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
fa588e0c SF |
304 | inode->i_sb, |
305 | cifs_sb->mnt_file_mode /* ignored */, | |
306 | oflags, &oplock, &netfid, xid); | |
276a74a4 | 307 | if (rc == 0) { |
b6b38f70 | 308 | cFYI(1, "posix open succeeded"); |
276a74a4 SF |
309 | /* no need for special case handling of setting mode |
310 | on read only files needed here */ | |
311 | ||
703a3b8e | 312 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
313 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
314 | pCifsFile, oplock, netfid); | |
315 | goto out; | |
64cc2c63 SF |
316 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
317 | if (tcon->ses->serverNOS) | |
b6b38f70 | 318 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
319 | " unexpected error on SMB posix open" |
320 | ", disabling posix open support." | |
321 | " Check if server update available.", | |
322 | tcon->ses->serverName, | |
b6b38f70 | 323 | tcon->ses->serverNOS); |
64cc2c63 | 324 | tcon->broken_posix_open = true; |
276a74a4 SF |
325 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
326 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
327 | goto out; | |
64cc2c63 SF |
328 | /* else fallthrough to retry open the old way on network i/o |
329 | or DFS errors */ | |
276a74a4 SF |
330 | } |
331 | ||
1da177e4 LT |
332 | desiredAccess = cifs_convert_flags(file->f_flags); |
333 | ||
334 | /********************************************************************* | |
335 | * open flag mapping table: | |
fb8c4b14 | 336 | * |
1da177e4 | 337 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 338 | * ---------- ---------------- |
1da177e4 LT |
339 | * O_CREAT FILE_OPEN_IF |
340 | * O_CREAT | O_EXCL FILE_CREATE | |
341 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
342 | * O_TRUNC FILE_OVERWRITE | |
343 | * none of the above FILE_OPEN | |
344 | * | |
345 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 346 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
347 | * O_CREAT | O_TRUNC is similar but truncates the existing |
348 | * file rather than creating a new file as FILE_SUPERSEDE does | |
349 | * (which uses the attributes / metadata passed in on open call) | |
350 | *? | |
fb8c4b14 | 351 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
352 | *? and the read write flags match reasonably. O_LARGEFILE |
353 | *? is irrelevant because largefile support is always used | |
354 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
355 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
356 | *********************************************************************/ | |
357 | ||
358 | disposition = cifs_get_disposition(file->f_flags); | |
359 | ||
1da177e4 LT |
360 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
361 | ||
362 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
363 | and calling get_inode_info with returned buf (at least helps | |
364 | non-Unix server case) */ | |
365 | ||
fb8c4b14 SF |
366 | /* BB we can not do this if this is the second open of a file |
367 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
368 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
369 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
370 | if (!buf) { | |
371 | rc = -ENOMEM; | |
372 | goto out; | |
373 | } | |
5bafd765 SF |
374 | |
375 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 376 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 377 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
378 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
379 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
380 | else |
381 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
382 | ||
a9d02ad4 SF |
383 | if (rc == -EIO) { |
384 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 385 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
386 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
387 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
388 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
389 | } | |
1da177e4 | 390 | if (rc) { |
b6b38f70 | 391 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
392 | goto out; |
393 | } | |
3321b791 | 394 | |
086f68bd JL |
395 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
396 | file->f_flags); | |
397 | file->private_data = pCifsFile; | |
1da177e4 LT |
398 | if (file->private_data == NULL) { |
399 | rc = -ENOMEM; | |
400 | goto out; | |
401 | } | |
1da177e4 | 402 | |
3321b791 JL |
403 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
404 | &oplock, buf, full_path, xid); | |
1da177e4 | 405 | |
fb8c4b14 | 406 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
407 | /* time to set mode which we can not set earlier due to |
408 | problems creating new read-only files */ | |
276a74a4 | 409 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
410 | struct cifs_unix_set_info_args args = { |
411 | .mode = inode->i_mode, | |
412 | .uid = NO_CHANGE_64, | |
413 | .gid = NO_CHANGE_64, | |
414 | .ctime = NO_CHANGE_64, | |
415 | .atime = NO_CHANGE_64, | |
416 | .mtime = NO_CHANGE_64, | |
417 | .device = 0, | |
418 | }; | |
01ea95e3 JL |
419 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
420 | cifs_sb->local_nls, | |
421 | cifs_sb->mnt_cifs_flags & | |
737b758c | 422 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
423 | } |
424 | } | |
425 | ||
426 | out: | |
427 | kfree(buf); | |
428 | kfree(full_path); | |
429 | FreeXid(xid); | |
430 | return rc; | |
431 | } | |
432 | ||
0418726b | 433 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
434 | /* to server was lost */ |
435 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
436 | { | |
437 | int rc = 0; | |
438 | ||
439 | /* BB list all locks open on this file and relock */ | |
440 | ||
441 | return rc; | |
442 | } | |
443 | ||
4b18f2a9 | 444 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
445 | { |
446 | int rc = -EACCES; | |
590a3fe0 JL |
447 | int xid; |
448 | __u32 oplock; | |
1da177e4 | 449 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 450 | struct cifsTconInfo *tcon; |
1da177e4 LT |
451 | struct cifsFileInfo *pCifsFile; |
452 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 453 | struct inode *inode; |
1da177e4 LT |
454 | char *full_path = NULL; |
455 | int desiredAccess; | |
456 | int disposition = FILE_OPEN; | |
457 | __u16 netfid; | |
458 | ||
ad7a2926 | 459 | if (file->private_data) |
1da177e4 | 460 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 461 | else |
1da177e4 LT |
462 | return -EBADF; |
463 | ||
464 | xid = GetXid(); | |
f0a71eb8 | 465 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 466 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 467 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 468 | rc = 0; |
1da177e4 | 469 | FreeXid(xid); |
0f3bc09e | 470 | return rc; |
1da177e4 LT |
471 | } |
472 | ||
e6a00296 | 473 | if (file->f_path.dentry == NULL) { |
b6b38f70 | 474 | cERROR(1, "no valid name if dentry freed"); |
3a9f462f SF |
475 | dump_stack(); |
476 | rc = -EBADF; | |
477 | goto reopen_error_exit; | |
478 | } | |
479 | ||
480 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 481 | if (inode == NULL) { |
b6b38f70 | 482 | cERROR(1, "inode not valid"); |
3a9f462f SF |
483 | dump_stack(); |
484 | rc = -EBADF; | |
485 | goto reopen_error_exit; | |
1da177e4 | 486 | } |
50c2f753 | 487 | |
1da177e4 | 488 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 489 | tcon = cifs_sb->tcon; |
3a9f462f | 490 | |
1da177e4 LT |
491 | /* can not grab rename sem here because various ops, including |
492 | those that already have the rename sem can end up causing writepage | |
493 | to get called and if the server was down that means we end up here, | |
494 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 495 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 496 | if (full_path == NULL) { |
3a9f462f SF |
497 | rc = -ENOMEM; |
498 | reopen_error_exit: | |
f0a71eb8 | 499 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 500 | FreeXid(xid); |
3a9f462f | 501 | return rc; |
1da177e4 LT |
502 | } |
503 | ||
b6b38f70 JP |
504 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
505 | inode, file->f_flags, full_path); | |
1da177e4 LT |
506 | |
507 | if (oplockEnabled) | |
508 | oplock = REQ_OPLOCK; | |
509 | else | |
4b18f2a9 | 510 | oplock = 0; |
1da177e4 | 511 | |
7fc8f4e9 SF |
512 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
513 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
514 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
515 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
516 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 517 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
fa588e0c SF |
518 | inode->i_sb, |
519 | cifs_sb->mnt_file_mode /* ignored */, | |
520 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 521 | if (rc == 0) { |
b6b38f70 | 522 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
523 | goto reopen_success; |
524 | } | |
525 | /* fallthrough to retry open the old way on errors, especially | |
526 | in the reconnect path it is important to retry hard */ | |
527 | } | |
528 | ||
529 | desiredAccess = cifs_convert_flags(file->f_flags); | |
530 | ||
1da177e4 | 531 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
532 | by SMBOpen and then calling get_inode_info with returned buf |
533 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
534 | and server version of file size can be stale. If we knew for sure |
535 | that inode was not dirty locally we could do this */ | |
536 | ||
7fc8f4e9 | 537 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 538 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 539 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 540 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 541 | if (rc) { |
f0a71eb8 | 542 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
543 | cFYI(1, "cifs_open returned 0x%x", rc); |
544 | cFYI(1, "oplock: %d", oplock); | |
1da177e4 | 545 | } else { |
7fc8f4e9 | 546 | reopen_success: |
1da177e4 | 547 | pCifsFile->netfid = netfid; |
4b18f2a9 | 548 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 549 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
550 | pCifsInode = CIFS_I(inode); |
551 | if (pCifsInode) { | |
552 | if (can_flush) { | |
cea21805 JL |
553 | rc = filemap_write_and_wait(inode->i_mapping); |
554 | if (rc != 0) | |
555 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
556 | /* temporarily disable caching while we |
557 | go to server to get inode info */ | |
4b18f2a9 SF |
558 | pCifsInode->clientCanCacheAll = false; |
559 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 560 | if (tcon->unix_ext) |
1da177e4 LT |
561 | rc = cifs_get_inode_info_unix(&inode, |
562 | full_path, inode->i_sb, xid); | |
563 | else | |
564 | rc = cifs_get_inode_info(&inode, | |
565 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 566 | xid, NULL); |
1da177e4 LT |
567 | } /* else we are writing out data to server already |
568 | and could deadlock if we tried to flush data, and | |
569 | since we do not know if we have data that would | |
570 | invalidate the current end of file on the server | |
571 | we can not go to the server to get the new inod | |
572 | info */ | |
573 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
574 | pCifsInode->clientCanCacheAll = true; |
575 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
576 | cFYI(1, "Exclusive Oplock granted on inode %p", |
577 | file->f_path.dentry->d_inode); | |
1da177e4 | 578 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
579 | pCifsInode->clientCanCacheRead = true; |
580 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 581 | } else { |
4b18f2a9 SF |
582 | pCifsInode->clientCanCacheRead = false; |
583 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
584 | } |
585 | cifs_relock_file(pCifsFile); | |
586 | } | |
587 | } | |
1da177e4 LT |
588 | kfree(full_path); |
589 | FreeXid(xid); | |
590 | return rc; | |
591 | } | |
592 | ||
593 | int cifs_close(struct inode *inode, struct file *file) | |
594 | { | |
595 | int rc = 0; | |
15745320 | 596 | int xid, timeout; |
1da177e4 LT |
597 | struct cifs_sb_info *cifs_sb; |
598 | struct cifsTconInfo *pTcon; | |
599 | struct cifsFileInfo *pSMBFile = | |
600 | (struct cifsFileInfo *)file->private_data; | |
601 | ||
602 | xid = GetXid(); | |
603 | ||
604 | cifs_sb = CIFS_SB(inode->i_sb); | |
605 | pTcon = cifs_sb->tcon; | |
606 | if (pSMBFile) { | |
7ee1af76 | 607 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 608 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 609 | pSMBFile->closePend = true; |
1da177e4 LT |
610 | if (pTcon) { |
611 | /* no sense reconnecting to close a file that is | |
612 | already closed */ | |
3b795210 | 613 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 614 | write_unlock(&GlobalSMBSeslock); |
15745320 | 615 | timeout = 2; |
6ab409b5 | 616 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 617 | && (timeout <= 2048)) { |
23e7dd7d SF |
618 | /* Give write a better chance to get to |
619 | server ahead of the close. We do not | |
620 | want to add a wait_q here as it would | |
621 | increase the memory utilization as | |
622 | the struct would be in each open file, | |
fb8c4b14 | 623 | but this should give enough time to |
23e7dd7d | 624 | clear the socket */ |
b6b38f70 | 625 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
626 | msleep(timeout); |
627 | timeout *= 4; | |
4891d539 | 628 | } |
ddb4cbfc SF |
629 | if (!pTcon->need_reconnect && |
630 | !pSMBFile->invalidHandle) | |
631 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 632 | pSMBFile->netfid); |
ddb4cbfc SF |
633 | } else |
634 | write_unlock(&GlobalSMBSeslock); | |
635 | } else | |
636 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
637 | |
638 | /* Delete any outstanding lock records. | |
639 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 640 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
641 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
642 | list_del(&li->llist); | |
643 | kfree(li); | |
644 | } | |
796e5661 | 645 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 646 | |
cbe0476f | 647 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
648 | list_del(&pSMBFile->flist); |
649 | list_del(&pSMBFile->tlist); | |
cbe0476f | 650 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 651 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
652 | file->private_data = NULL; |
653 | } else | |
654 | rc = -EBADF; | |
655 | ||
4efa53f0 | 656 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 657 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 658 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
659 | /* if the file is not open we do not know if we can cache info |
660 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
661 | CIFS_I(inode)->clientCanCacheRead = false; |
662 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 663 | } |
4efa53f0 | 664 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 665 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
666 | rc = CIFS_I(inode)->write_behind_rc; |
667 | FreeXid(xid); | |
668 | return rc; | |
669 | } | |
670 | ||
671 | int cifs_closedir(struct inode *inode, struct file *file) | |
672 | { | |
673 | int rc = 0; | |
674 | int xid; | |
675 | struct cifsFileInfo *pCFileStruct = | |
676 | (struct cifsFileInfo *)file->private_data; | |
677 | char *ptmp; | |
678 | ||
b6b38f70 | 679 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
680 | |
681 | xid = GetXid(); | |
682 | ||
683 | if (pCFileStruct) { | |
684 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
685 | struct cifs_sb_info *cifs_sb = |
686 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
687 | |
688 | pTcon = cifs_sb->tcon; | |
689 | ||
b6b38f70 | 690 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 691 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
692 | if (!pCFileStruct->srch_inf.endOfSearch && |
693 | !pCFileStruct->invalidHandle) { | |
694 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 695 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 696 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
697 | cFYI(1, "Closing uncompleted readdir with rc %d", |
698 | rc); | |
1da177e4 LT |
699 | /* not much we can do if it fails anyway, ignore rc */ |
700 | rc = 0; | |
ddb4cbfc SF |
701 | } else |
702 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
703 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
704 | if (ptmp) { | |
b6b38f70 | 705 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 706 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 707 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
708 | cifs_small_buf_release(ptmp); |
709 | else | |
710 | cifs_buf_release(ptmp); | |
1da177e4 | 711 | } |
1da177e4 LT |
712 | kfree(file->private_data); |
713 | file->private_data = NULL; | |
714 | } | |
715 | /* BB can we lock the filestruct while this is going on? */ | |
716 | FreeXid(xid); | |
717 | return rc; | |
718 | } | |
719 | ||
7ee1af76 JA |
720 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
721 | __u64 offset, __u8 lockType) | |
722 | { | |
fb8c4b14 SF |
723 | struct cifsLockInfo *li = |
724 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
725 | if (li == NULL) |
726 | return -ENOMEM; | |
727 | li->offset = offset; | |
728 | li->length = len; | |
729 | li->type = lockType; | |
796e5661 | 730 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 731 | list_add(&li->llist, &fid->llist); |
796e5661 | 732 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
733 | return 0; |
734 | } | |
735 | ||
1da177e4 LT |
736 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
737 | { | |
738 | int rc, xid; | |
1da177e4 LT |
739 | __u32 numLock = 0; |
740 | __u32 numUnlock = 0; | |
741 | __u64 length; | |
4b18f2a9 | 742 | bool wait_flag = false; |
1da177e4 | 743 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 744 | struct cifsTconInfo *tcon; |
08547b03 SF |
745 | __u16 netfid; |
746 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 747 | bool posix_locking = 0; |
1da177e4 LT |
748 | |
749 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
750 | rc = -EACCES; | |
751 | xid = GetXid(); | |
752 | ||
b6b38f70 | 753 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 754 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 755 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 756 | pfLock->fl_end); |
1da177e4 LT |
757 | |
758 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 759 | cFYI(1, "Posix"); |
1da177e4 | 760 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 761 | cFYI(1, "Flock"); |
1da177e4 | 762 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 763 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 764 | wait_flag = true; |
1da177e4 LT |
765 | } |
766 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
767 | cFYI(1, "Process suspended by mandatory locking - " |
768 | "not implemented yet"); | |
1da177e4 | 769 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 770 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 771 | if (pfLock->fl_flags & |
1da177e4 | 772 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 773 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
774 | |
775 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 776 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
777 | numLock = 1; |
778 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 779 | cFYI(1, "F_UNLCK"); |
1da177e4 | 780 | numUnlock = 1; |
d47d7c1a SF |
781 | /* Check if unlock includes more than |
782 | one lock range */ | |
1da177e4 | 783 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 784 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
785 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
786 | numLock = 1; | |
787 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 788 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
789 | numLock = 1; |
790 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 791 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
792 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
793 | numLock = 1; | |
794 | } else | |
b6b38f70 | 795 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 796 | |
e6a00296 | 797 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 798 | tcon = cifs_sb->tcon; |
1da177e4 LT |
799 | |
800 | if (file->private_data == NULL) { | |
0f3bc09e | 801 | rc = -EBADF; |
1da177e4 | 802 | FreeXid(xid); |
0f3bc09e | 803 | return rc; |
1da177e4 | 804 | } |
08547b03 SF |
805 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
806 | ||
13a6e42a SF |
807 | if ((tcon->ses->capabilities & CAP_UNIX) && |
808 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 809 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 810 | posix_locking = 1; |
08547b03 SF |
811 | /* BB add code here to normalize offset and length to |
812 | account for negative length which we can not accept over the | |
813 | wire */ | |
1da177e4 | 814 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 815 | if (posix_locking) { |
08547b03 | 816 | int posix_lock_type; |
fb8c4b14 | 817 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
818 | posix_lock_type = CIFS_RDLCK; |
819 | else | |
820 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 821 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 822 | length, pfLock, |
08547b03 SF |
823 | posix_lock_type, wait_flag); |
824 | FreeXid(xid); | |
825 | return rc; | |
826 | } | |
827 | ||
828 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 829 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 830 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 831 | if (rc == 0) { |
13a6e42a | 832 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
833 | pfLock->fl_start, 1 /* numUnlock */ , |
834 | 0 /* numLock */ , lockType, | |
835 | 0 /* wait flag */ ); | |
836 | pfLock->fl_type = F_UNLCK; | |
837 | if (rc != 0) | |
b6b38f70 JP |
838 | cERROR(1, "Error unlocking previously locked " |
839 | "range %d during test of lock", rc); | |
1da177e4 LT |
840 | rc = 0; |
841 | ||
842 | } else { | |
843 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
844 | rc = 0; |
845 | ||
846 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
847 | pfLock->fl_type = F_WRLCK; | |
848 | } else { | |
849 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
850 | pfLock->fl_start, 0, 1, | |
851 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
852 | 0 /* wait flag */); | |
853 | if (rc == 0) { | |
854 | rc = CIFSSMBLock(xid, tcon, netfid, | |
855 | length, pfLock->fl_start, 1, 0, | |
856 | lockType | | |
857 | LOCKING_ANDX_SHARED_LOCK, | |
858 | 0 /* wait flag */); | |
859 | pfLock->fl_type = F_RDLCK; | |
860 | if (rc != 0) | |
f19159dc | 861 | cERROR(1, "Error unlocking " |
f05337c6 | 862 | "previously locked range %d " |
f19159dc | 863 | "during test of lock", rc); |
f05337c6 PS |
864 | rc = 0; |
865 | } else { | |
866 | pfLock->fl_type = F_WRLCK; | |
867 | rc = 0; | |
868 | } | |
869 | } | |
1da177e4 LT |
870 | } |
871 | ||
872 | FreeXid(xid); | |
873 | return rc; | |
874 | } | |
7ee1af76 JA |
875 | |
876 | if (!numLock && !numUnlock) { | |
877 | /* if no lock or unlock then nothing | |
878 | to do since we do not know what it is */ | |
879 | FreeXid(xid); | |
880 | return -EOPNOTSUPP; | |
881 | } | |
882 | ||
883 | if (posix_locking) { | |
08547b03 | 884 | int posix_lock_type; |
fb8c4b14 | 885 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
886 | posix_lock_type = CIFS_RDLCK; |
887 | else | |
888 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 889 | |
fb8c4b14 | 890 | if (numUnlock == 1) |
beb84dc8 | 891 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 892 | |
13a6e42a | 893 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 894 | length, pfLock, |
08547b03 | 895 | posix_lock_type, wait_flag); |
7ee1af76 | 896 | } else { |
fb8c4b14 SF |
897 | struct cifsFileInfo *fid = |
898 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
899 | |
900 | if (numLock) { | |
13a6e42a | 901 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 902 | pfLock->fl_start, |
7ee1af76 JA |
903 | 0, numLock, lockType, wait_flag); |
904 | ||
905 | if (rc == 0) { | |
906 | /* For Windows locks we must store them. */ | |
907 | rc = store_file_lock(fid, length, | |
908 | pfLock->fl_start, lockType); | |
909 | } | |
910 | } else if (numUnlock) { | |
911 | /* For each stored lock that this unlock overlaps | |
912 | completely, unlock it. */ | |
913 | int stored_rc = 0; | |
914 | struct cifsLockInfo *li, *tmp; | |
915 | ||
6b70c955 | 916 | rc = 0; |
796e5661 | 917 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
918 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
919 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 920 | (pfLock->fl_start + length) >= |
39db810c | 921 | (li->offset + li->length)) { |
13a6e42a | 922 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 923 | netfid, |
7ee1af76 | 924 | li->length, li->offset, |
4b18f2a9 | 925 | 1, 0, li->type, false); |
7ee1af76 JA |
926 | if (stored_rc) |
927 | rc = stored_rc; | |
2c964d1f PS |
928 | else { |
929 | list_del(&li->llist); | |
930 | kfree(li); | |
931 | } | |
7ee1af76 JA |
932 | } |
933 | } | |
796e5661 | 934 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
935 | } |
936 | } | |
937 | ||
d634cc15 | 938 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
939 | posix_lock_file_wait(file, pfLock); |
940 | FreeXid(xid); | |
941 | return rc; | |
942 | } | |
943 | ||
fbec9ab9 JL |
944 | /* |
945 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
946 | * these calls can be very long. | |
947 | * | |
948 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
949 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
950 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
951 | * welcome if someone wants to suggest one. | |
952 | * | |
953 | * We may be able to do a better job with this if there were some way to | |
954 | * declare that a file should be sparse. | |
955 | */ | |
956 | static int | |
957 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
958 | { | |
959 | if (offset <= cifsi->server_eof) | |
960 | return CIFS_STD_OP; | |
961 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
962 | return CIFS_VLONG_OP; | |
963 | else | |
964 | return CIFS_LONG_OP; | |
965 | } | |
966 | ||
967 | /* update the file size (if needed) after a write */ | |
968 | static void | |
969 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
970 | unsigned int bytes_written) | |
971 | { | |
972 | loff_t end_of_write = offset + bytes_written; | |
973 | ||
974 | if (end_of_write > cifsi->server_eof) | |
975 | cifsi->server_eof = end_of_write; | |
976 | } | |
977 | ||
1da177e4 LT |
978 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
979 | size_t write_size, loff_t *poffset) | |
980 | { | |
981 | int rc = 0; | |
982 | unsigned int bytes_written = 0; | |
983 | unsigned int total_written; | |
984 | struct cifs_sb_info *cifs_sb; | |
985 | struct cifsTconInfo *pTcon; | |
986 | int xid, long_op; | |
987 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 988 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 989 | |
e6a00296 | 990 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
991 | |
992 | pTcon = cifs_sb->tcon; | |
993 | ||
b6b38f70 JP |
994 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
995 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
996 | |
997 | if (file->private_data == NULL) | |
998 | return -EBADF; | |
c33f8d32 | 999 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 1000 | |
838726c4 JL |
1001 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1002 | if (rc) | |
1003 | return rc; | |
1004 | ||
1da177e4 | 1005 | xid = GetXid(); |
1da177e4 | 1006 | |
fbec9ab9 | 1007 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1008 | for (total_written = 0; write_size > total_written; |
1009 | total_written += bytes_written) { | |
1010 | rc = -EAGAIN; | |
1011 | while (rc == -EAGAIN) { | |
1012 | if (file->private_data == NULL) { | |
1013 | /* file has been closed on us */ | |
1014 | FreeXid(xid); | |
1015 | /* if we have gotten here we have written some data | |
1016 | and blocked, and the file has been freed on us while | |
1017 | we blocked so return what we managed to write */ | |
1018 | return total_written; | |
fb8c4b14 | 1019 | } |
1da177e4 LT |
1020 | if (open_file->closePend) { |
1021 | FreeXid(xid); | |
1022 | if (total_written) | |
1023 | return total_written; | |
1024 | else | |
1025 | return -EBADF; | |
1026 | } | |
1027 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1028 | /* we could deadlock if we called |
1029 | filemap_fdatawait from here so tell | |
1030 | reopen_file not to flush data to server | |
1031 | now */ | |
4b18f2a9 | 1032 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1033 | if (rc != 0) |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | rc = CIFSSMBWrite(xid, pTcon, | |
1038 | open_file->netfid, | |
1039 | min_t(const int, cifs_sb->wsize, | |
1040 | write_size - total_written), | |
1041 | *poffset, &bytes_written, | |
1042 | NULL, write_data + total_written, long_op); | |
1043 | } | |
1044 | if (rc || (bytes_written == 0)) { | |
1045 | if (total_written) | |
1046 | break; | |
1047 | else { | |
1048 | FreeXid(xid); | |
1049 | return rc; | |
1050 | } | |
fbec9ab9 JL |
1051 | } else { |
1052 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1053 | *poffset += bytes_written; |
fbec9ab9 | 1054 | } |
133672ef | 1055 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1056 | 15 seconds is plenty */ |
1057 | } | |
1058 | ||
a4544347 | 1059 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1060 | |
1061 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1062 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1063 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1064 | /* Do not update local mtime - server will set its actual value on write |
1065 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1066 | * current_fs_time(inode->i_sb);*/ |
1067 | if (total_written > 0) { | |
1068 | spin_lock(&inode->i_lock); | |
1069 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1070 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1071 | *poffset); |
3677db10 | 1072 | spin_unlock(&inode->i_lock); |
1da177e4 | 1073 | } |
fb8c4b14 | 1074 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1075 | } |
1076 | FreeXid(xid); | |
1077 | return total_written; | |
1078 | } | |
1079 | ||
1080 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1081 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1082 | { |
1083 | int rc = 0; | |
1084 | unsigned int bytes_written = 0; | |
1085 | unsigned int total_written; | |
1086 | struct cifs_sb_info *cifs_sb; | |
1087 | struct cifsTconInfo *pTcon; | |
1088 | int xid, long_op; | |
1089 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1090 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1091 | |
e6a00296 | 1092 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1093 | |
1094 | pTcon = cifs_sb->tcon; | |
1095 | ||
b6b38f70 JP |
1096 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1097 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1098 | |
1099 | if (file->private_data == NULL) | |
1100 | return -EBADF; | |
c33f8d32 | 1101 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1102 | |
1da177e4 | 1103 | xid = GetXid(); |
1da177e4 | 1104 | |
fbec9ab9 | 1105 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1106 | for (total_written = 0; write_size > total_written; |
1107 | total_written += bytes_written) { | |
1108 | rc = -EAGAIN; | |
1109 | while (rc == -EAGAIN) { | |
1110 | if (file->private_data == NULL) { | |
1111 | /* file has been closed on us */ | |
1112 | FreeXid(xid); | |
1113 | /* if we have gotten here we have written some data | |
1114 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1115 | while we blocked so return what we managed to |
1da177e4 LT |
1116 | write */ |
1117 | return total_written; | |
fb8c4b14 | 1118 | } |
1da177e4 LT |
1119 | if (open_file->closePend) { |
1120 | FreeXid(xid); | |
1121 | if (total_written) | |
1122 | return total_written; | |
1123 | else | |
1124 | return -EBADF; | |
1125 | } | |
1126 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1127 | /* we could deadlock if we called |
1128 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1129 | reopen_file not to flush data to |
1da177e4 | 1130 | server now */ |
4b18f2a9 | 1131 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1132 | if (rc != 0) |
1133 | break; | |
1134 | } | |
fb8c4b14 SF |
1135 | if (experimEnabled || (pTcon->ses->server && |
1136 | ((pTcon->ses->server->secMode & | |
08775834 | 1137 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1138 | == 0))) { |
3e84469d SF |
1139 | struct kvec iov[2]; |
1140 | unsigned int len; | |
1141 | ||
0ae0efad | 1142 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1143 | write_size - total_written); |
1144 | /* iov[0] is reserved for smb header */ | |
1145 | iov[1].iov_base = (char *)write_data + | |
1146 | total_written; | |
1147 | iov[1].iov_len = len; | |
d6e04ae6 | 1148 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1149 | open_file->netfid, len, |
d6e04ae6 | 1150 | *poffset, &bytes_written, |
3e84469d | 1151 | iov, 1, long_op); |
d6e04ae6 | 1152 | } else |
60808233 SF |
1153 | rc = CIFSSMBWrite(xid, pTcon, |
1154 | open_file->netfid, | |
1155 | min_t(const int, cifs_sb->wsize, | |
1156 | write_size - total_written), | |
1157 | *poffset, &bytes_written, | |
1158 | write_data + total_written, | |
1159 | NULL, long_op); | |
1da177e4 LT |
1160 | } |
1161 | if (rc || (bytes_written == 0)) { | |
1162 | if (total_written) | |
1163 | break; | |
1164 | else { | |
1165 | FreeXid(xid); | |
1166 | return rc; | |
1167 | } | |
fbec9ab9 JL |
1168 | } else { |
1169 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1170 | *poffset += bytes_written; |
fbec9ab9 | 1171 | } |
133672ef | 1172 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1173 | 15 seconds is plenty */ |
1174 | } | |
1175 | ||
a4544347 | 1176 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1177 | |
1178 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1179 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1180 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1181 | /* file->f_path.dentry->d_inode->i_ctime = |
1182 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1183 | if (total_written > 0) { | |
1184 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1185 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1186 | i_size_write(file->f_path.dentry->d_inode, | |
1187 | *poffset); | |
1188 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1189 | } |
3677db10 | 1190 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1191 | } |
1192 | FreeXid(xid); | |
1193 | return total_written; | |
1194 | } | |
1195 | ||
630f3f0c SF |
1196 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1197 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1198 | { | |
1199 | struct cifsFileInfo *open_file = NULL; | |
1200 | ||
1201 | read_lock(&GlobalSMBSeslock); | |
1202 | /* we could simply get the first_list_entry since write-only entries | |
1203 | are always at the end of the list but since the first entry might | |
1204 | have a close pending, we go through the whole list */ | |
1205 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1206 | if (open_file->closePend) | |
1207 | continue; | |
1208 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1209 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1210 | if (!open_file->invalidHandle) { | |
1211 | /* found a good file */ | |
1212 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1213 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1214 | read_unlock(&GlobalSMBSeslock); |
1215 | return open_file; | |
1216 | } /* else might as well continue, and look for | |
1217 | another, or simply have the caller reopen it | |
1218 | again rather than trying to fix this handle */ | |
1219 | } else /* write only file */ | |
1220 | break; /* write only files are last so must be done */ | |
1221 | } | |
1222 | read_unlock(&GlobalSMBSeslock); | |
1223 | return NULL; | |
1224 | } | |
1225 | #endif | |
1226 | ||
dd99cd80 | 1227 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1228 | { |
1229 | struct cifsFileInfo *open_file; | |
2846d386 | 1230 | bool any_available = false; |
dd99cd80 | 1231 | int rc; |
6148a742 | 1232 | |
60808233 SF |
1233 | /* Having a null inode here (because mapping->host was set to zero by |
1234 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1235 | it being zero) during stress testcases so we need to check for it */ | |
1236 | ||
fb8c4b14 | 1237 | if (cifs_inode == NULL) { |
b6b38f70 | 1238 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1239 | dump_stack(); |
1240 | return NULL; | |
1241 | } | |
1242 | ||
6148a742 | 1243 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1244 | refind_writable: |
6148a742 | 1245 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1246 | if (open_file->closePend || |
1247 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1248 | continue; |
2846d386 | 1249 | |
6148a742 SF |
1250 | if (open_file->pfile && |
1251 | ((open_file->pfile->f_flags & O_RDWR) || | |
1252 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1253 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1254 | |
1255 | if (!open_file->invalidHandle) { | |
1256 | /* found a good writable file */ | |
1257 | read_unlock(&GlobalSMBSeslock); | |
1258 | return open_file; | |
1259 | } | |
8840dee9 | 1260 | |
6148a742 | 1261 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1262 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1263 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1264 | if (!rc) { |
9b22b0b7 SF |
1265 | if (!open_file->closePend) |
1266 | return open_file; | |
1267 | else { /* start over in case this was deleted */ | |
1268 | /* since the list could be modified */ | |
37c0eb46 | 1269 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1270 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1271 | goto refind_writable; |
37c0eb46 SF |
1272 | } |
1273 | } | |
9b22b0b7 SF |
1274 | |
1275 | /* if it fails, try another handle if possible - | |
1276 | (we can not do this if closePending since | |
1277 | loop could be modified - in which case we | |
1278 | have to start at the beginning of the list | |
1279 | again. Note that it would be bad | |
1280 | to hold up writepages here (rather than | |
1281 | in caller) with continuous retries */ | |
b6b38f70 | 1282 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1283 | read_lock(&GlobalSMBSeslock); |
1284 | /* can not use this handle, no write | |
1285 | pending on this one after all */ | |
6ab409b5 | 1286 | cifsFileInfo_put(open_file); |
8840dee9 | 1287 | |
9b22b0b7 SF |
1288 | if (open_file->closePend) /* list could have changed */ |
1289 | goto refind_writable; | |
1290 | /* else we simply continue to the next entry. Thus | |
1291 | we do not loop on reopen errors. If we | |
1292 | can not reopen the file, for example if we | |
1293 | reconnected to a server with another client | |
1294 | racing to delete or lock the file we would not | |
1295 | make progress if we restarted before the beginning | |
1296 | of the loop here. */ | |
6148a742 SF |
1297 | } |
1298 | } | |
2846d386 JL |
1299 | /* couldn't find useable FH with same pid, try any available */ |
1300 | if (!any_available) { | |
1301 | any_available = true; | |
1302 | goto refind_writable; | |
1303 | } | |
6148a742 SF |
1304 | read_unlock(&GlobalSMBSeslock); |
1305 | return NULL; | |
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1309 | { | |
1310 | struct address_space *mapping = page->mapping; | |
1311 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1312 | char *write_data; | |
1313 | int rc = -EFAULT; | |
1314 | int bytes_written = 0; | |
1315 | struct cifs_sb_info *cifs_sb; | |
1316 | struct cifsTconInfo *pTcon; | |
1317 | struct inode *inode; | |
6148a742 | 1318 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1319 | |
1320 | if (!mapping || !mapping->host) | |
1321 | return -EFAULT; | |
1322 | ||
1323 | inode = page->mapping->host; | |
1324 | cifs_sb = CIFS_SB(inode->i_sb); | |
1325 | pTcon = cifs_sb->tcon; | |
1326 | ||
1327 | offset += (loff_t)from; | |
1328 | write_data = kmap(page); | |
1329 | write_data += from; | |
1330 | ||
1331 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1332 | kunmap(page); | |
1333 | return -EIO; | |
1334 | } | |
1335 | ||
1336 | /* racing with truncate? */ | |
1337 | if (offset > mapping->host->i_size) { | |
1338 | kunmap(page); | |
1339 | return 0; /* don't care */ | |
1340 | } | |
1341 | ||
1342 | /* check to make sure that we are not extending the file */ | |
1343 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1344 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1345 | |
6148a742 SF |
1346 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1347 | if (open_file) { | |
1348 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1349 | to-from, &offset); | |
6ab409b5 | 1350 | cifsFileInfo_put(open_file); |
1da177e4 | 1351 | /* Does mm or vfs already set times? */ |
6148a742 | 1352 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1353 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1354 | rc = 0; |
bb5a9a04 SF |
1355 | else if (bytes_written < 0) |
1356 | rc = bytes_written; | |
6148a742 | 1357 | } else { |
b6b38f70 | 1358 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1359 | rc = -EIO; |
1360 | } | |
1361 | ||
1362 | kunmap(page); | |
1363 | return rc; | |
1364 | } | |
1365 | ||
1da177e4 | 1366 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1367 | struct writeback_control *wbc) |
1da177e4 | 1368 | { |
37c0eb46 SF |
1369 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1370 | unsigned int bytes_to_write; | |
1371 | unsigned int bytes_written; | |
1372 | struct cifs_sb_info *cifs_sb; | |
1373 | int done = 0; | |
111ebb6e | 1374 | pgoff_t end; |
37c0eb46 | 1375 | pgoff_t index; |
fb8c4b14 SF |
1376 | int range_whole = 0; |
1377 | struct kvec *iov; | |
84d2f07e | 1378 | int len; |
37c0eb46 SF |
1379 | int n_iov = 0; |
1380 | pgoff_t next; | |
1381 | int nr_pages; | |
1382 | __u64 offset = 0; | |
23e7dd7d | 1383 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1384 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1385 | struct page *page; |
1386 | struct pagevec pvec; | |
1387 | int rc = 0; | |
1388 | int scanned = 0; | |
fbec9ab9 | 1389 | int xid, long_op; |
1da177e4 | 1390 | |
37c0eb46 | 1391 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1392 | |
37c0eb46 SF |
1393 | /* |
1394 | * If wsize is smaller that the page cache size, default to writing | |
1395 | * one page at a time via cifs_writepage | |
1396 | */ | |
1397 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1398 | return generic_writepages(mapping, wbc); | |
1399 | ||
fb8c4b14 SF |
1400 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1401 | if (cifs_sb->tcon->ses->server->secMode & | |
1402 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1403 | if (!experimEnabled) | |
60808233 | 1404 | return generic_writepages(mapping, wbc); |
4a77118c | 1405 | |
9a0c8230 | 1406 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1407 | if (iov == NULL) |
9a0c8230 SF |
1408 | return generic_writepages(mapping, wbc); |
1409 | ||
1410 | ||
37c0eb46 SF |
1411 | /* |
1412 | * BB: Is this meaningful for a non-block-device file system? | |
1413 | * If it is, we should test it again after we do I/O | |
1414 | */ | |
1415 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1416 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1417 | kfree(iov); |
37c0eb46 SF |
1418 | return 0; |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | xid = GetXid(); |
1422 | ||
37c0eb46 | 1423 | pagevec_init(&pvec, 0); |
111ebb6e | 1424 | if (wbc->range_cyclic) { |
37c0eb46 | 1425 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1426 | end = -1; |
1427 | } else { | |
1428 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1429 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1430 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1431 | range_whole = 1; | |
37c0eb46 SF |
1432 | scanned = 1; |
1433 | } | |
1434 | retry: | |
1435 | while (!done && (index <= end) && | |
1436 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1437 | PAGECACHE_TAG_DIRTY, | |
1438 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1439 | int first; | |
1440 | unsigned int i; | |
1441 | ||
37c0eb46 SF |
1442 | first = -1; |
1443 | next = 0; | |
1444 | n_iov = 0; | |
1445 | bytes_to_write = 0; | |
1446 | ||
1447 | for (i = 0; i < nr_pages; i++) { | |
1448 | page = pvec.pages[i]; | |
1449 | /* | |
1450 | * At this point we hold neither mapping->tree_lock nor | |
1451 | * lock on the page itself: the page may be truncated or | |
1452 | * invalidated (changing page->mapping to NULL), or even | |
1453 | * swizzled back from swapper_space to tmpfs file | |
1454 | * mapping | |
1455 | */ | |
1456 | ||
1457 | if (first < 0) | |
1458 | lock_page(page); | |
529ae9aa | 1459 | else if (!trylock_page(page)) |
37c0eb46 SF |
1460 | break; |
1461 | ||
1462 | if (unlikely(page->mapping != mapping)) { | |
1463 | unlock_page(page); | |
1464 | break; | |
1465 | } | |
1466 | ||
111ebb6e | 1467 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1468 | done = 1; |
1469 | unlock_page(page); | |
1470 | break; | |
1471 | } | |
1472 | ||
1473 | if (next && (page->index != next)) { | |
1474 | /* Not next consecutive page */ | |
1475 | unlock_page(page); | |
1476 | break; | |
1477 | } | |
1478 | ||
1479 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1480 | wait_on_page_writeback(page); | |
1481 | ||
1482 | if (PageWriteback(page) || | |
cb876f45 | 1483 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1484 | unlock_page(page); |
1485 | break; | |
1486 | } | |
84d2f07e | 1487 | |
cb876f45 LT |
1488 | /* |
1489 | * This actually clears the dirty bit in the radix tree. | |
1490 | * See cifs_writepage() for more commentary. | |
1491 | */ | |
1492 | set_page_writeback(page); | |
1493 | ||
84d2f07e SF |
1494 | if (page_offset(page) >= mapping->host->i_size) { |
1495 | done = 1; | |
1496 | unlock_page(page); | |
cb876f45 | 1497 | end_page_writeback(page); |
84d2f07e SF |
1498 | break; |
1499 | } | |
1500 | ||
37c0eb46 SF |
1501 | /* |
1502 | * BB can we get rid of this? pages are held by pvec | |
1503 | */ | |
1504 | page_cache_get(page); | |
1505 | ||
84d2f07e SF |
1506 | len = min(mapping->host->i_size - page_offset(page), |
1507 | (loff_t)PAGE_CACHE_SIZE); | |
1508 | ||
37c0eb46 SF |
1509 | /* reserve iov[0] for the smb header */ |
1510 | n_iov++; | |
1511 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1512 | iov[n_iov].iov_len = len; |
1513 | bytes_to_write += len; | |
37c0eb46 SF |
1514 | |
1515 | if (first < 0) { | |
1516 | first = i; | |
1517 | offset = page_offset(page); | |
1518 | } | |
1519 | next = page->index + 1; | |
1520 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1521 | break; | |
1522 | } | |
1523 | if (n_iov) { | |
23e7dd7d SF |
1524 | /* Search for a writable handle every time we call |
1525 | * CIFSSMBWrite2. We can't rely on the last handle | |
1526 | * we used to still be valid | |
1527 | */ | |
1528 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1529 | if (!open_file) { | |
b6b38f70 | 1530 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1531 | rc = -EBADF; |
1047abc1 | 1532 | } else { |
fbec9ab9 | 1533 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1534 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1535 | open_file->netfid, | |
1536 | bytes_to_write, offset, | |
1537 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1538 | long_op); |
6ab409b5 | 1539 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1540 | cifs_update_eof(cifsi, offset, bytes_written); |
1541 | ||
23e7dd7d | 1542 | if (rc || bytes_written < bytes_to_write) { |
b6b38f70 JP |
1543 | cERROR(1, "Write2 ret %d, wrote %d", |
1544 | rc, bytes_written); | |
23e7dd7d SF |
1545 | /* BB what if continued retry is |
1546 | requested via mount flags? */ | |
cea21805 JL |
1547 | if (rc == -ENOSPC) |
1548 | set_bit(AS_ENOSPC, &mapping->flags); | |
1549 | else | |
1550 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1551 | } else { |
1552 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1553 | bytes_written); | |
1554 | } | |
37c0eb46 SF |
1555 | } |
1556 | for (i = 0; i < n_iov; i++) { | |
1557 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1558 | /* Should we also set page error on |
1559 | success rc but too little data written? */ | |
1560 | /* BB investigate retry logic on temporary | |
1561 | server crash cases and how recovery works | |
fb8c4b14 SF |
1562 | when page marked as error */ |
1563 | if (rc) | |
eb9bdaa3 | 1564 | SetPageError(page); |
37c0eb46 SF |
1565 | kunmap(page); |
1566 | unlock_page(page); | |
cb876f45 | 1567 | end_page_writeback(page); |
37c0eb46 SF |
1568 | page_cache_release(page); |
1569 | } | |
1570 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1571 | done = 1; | |
1572 | index = next; | |
b066a48c DK |
1573 | } else |
1574 | /* Need to re-find the pages we skipped */ | |
1575 | index = pvec.pages[0]->index + 1; | |
1576 | ||
37c0eb46 SF |
1577 | pagevec_release(&pvec); |
1578 | } | |
1579 | if (!scanned && !done) { | |
1580 | /* | |
1581 | * We hit the last page and there is more work to be done: wrap | |
1582 | * back to the start of the file | |
1583 | */ | |
1584 | scanned = 1; | |
1585 | index = 0; | |
1586 | goto retry; | |
1587 | } | |
111ebb6e | 1588 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1589 | mapping->writeback_index = index; |
1590 | ||
1da177e4 | 1591 | FreeXid(xid); |
9a0c8230 | 1592 | kfree(iov); |
1da177e4 LT |
1593 | return rc; |
1594 | } | |
1da177e4 | 1595 | |
fb8c4b14 | 1596 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1597 | { |
1598 | int rc = -EFAULT; | |
1599 | int xid; | |
1600 | ||
1601 | xid = GetXid(); | |
1602 | /* BB add check for wbc flags */ | |
1603 | page_cache_get(page); | |
ad7a2926 | 1604 | if (!PageUptodate(page)) |
b6b38f70 | 1605 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1606 | |
1607 | /* | |
1608 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1609 | * | |
1610 | * A writepage() implementation always needs to do either this, | |
1611 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1612 | * the case of a failure. | |
1613 | * | |
1614 | * Just unlocking the page will cause the radix tree tag-bits | |
1615 | * to fail to update with the state of the page correctly. | |
1616 | */ | |
fb8c4b14 | 1617 | set_page_writeback(page); |
1da177e4 LT |
1618 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1619 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1620 | unlock_page(page); | |
cb876f45 LT |
1621 | end_page_writeback(page); |
1622 | page_cache_release(page); | |
1da177e4 LT |
1623 | FreeXid(xid); |
1624 | return rc; | |
1625 | } | |
1626 | ||
d9414774 NP |
1627 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1628 | loff_t pos, unsigned len, unsigned copied, | |
1629 | struct page *page, void *fsdata) | |
1da177e4 | 1630 | { |
d9414774 NP |
1631 | int rc; |
1632 | struct inode *inode = mapping->host; | |
1da177e4 | 1633 | |
b6b38f70 JP |
1634 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1635 | page, pos, copied); | |
d9414774 | 1636 | |
a98ee8c1 JL |
1637 | if (PageChecked(page)) { |
1638 | if (copied == len) | |
1639 | SetPageUptodate(page); | |
1640 | ClearPageChecked(page); | |
1641 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1642 | SetPageUptodate(page); |
ad7a2926 | 1643 | |
1da177e4 | 1644 | if (!PageUptodate(page)) { |
d9414774 NP |
1645 | char *page_data; |
1646 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1647 | int xid; | |
1648 | ||
1649 | xid = GetXid(); | |
1da177e4 LT |
1650 | /* this is probably better than directly calling |
1651 | partialpage_write since in this function the file handle is | |
1652 | known which we might as well leverage */ | |
1653 | /* BB check if anything else missing out of ppw | |
1654 | such as updating last write time */ | |
1655 | page_data = kmap(page); | |
d9414774 NP |
1656 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1657 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1658 | kunmap(page); |
d9414774 NP |
1659 | |
1660 | FreeXid(xid); | |
fb8c4b14 | 1661 | } else { |
d9414774 NP |
1662 | rc = copied; |
1663 | pos += copied; | |
1da177e4 LT |
1664 | set_page_dirty(page); |
1665 | } | |
1666 | ||
d9414774 NP |
1667 | if (rc > 0) { |
1668 | spin_lock(&inode->i_lock); | |
1669 | if (pos > inode->i_size) | |
1670 | i_size_write(inode, pos); | |
1671 | spin_unlock(&inode->i_lock); | |
1672 | } | |
1673 | ||
1674 | unlock_page(page); | |
1675 | page_cache_release(page); | |
1676 | ||
1da177e4 LT |
1677 | return rc; |
1678 | } | |
1679 | ||
1680 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1681 | { | |
1682 | int xid; | |
1683 | int rc = 0; | |
b298f223 SF |
1684 | struct cifsTconInfo *tcon; |
1685 | struct cifsFileInfo *smbfile = | |
1686 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1687 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1688 | |
1689 | xid = GetXid(); | |
1690 | ||
b6b38f70 JP |
1691 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
1692 | dentry->d_name.name, datasync); | |
50c2f753 | 1693 | |
cea21805 JL |
1694 | rc = filemap_write_and_wait(inode->i_mapping); |
1695 | if (rc == 0) { | |
1696 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1697 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1698 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1699 | if (!rc && tcon && smbfile && |
4717bed6 | 1700 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1701 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1702 | } |
b298f223 | 1703 | |
1da177e4 LT |
1704 | FreeXid(xid); |
1705 | return rc; | |
1706 | } | |
1707 | ||
3978d717 | 1708 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1709 | { |
1710 | struct address_space *mapping; | |
1711 | struct inode *inode; | |
1712 | unsigned long index = page->index; | |
1713 | unsigned int rpages = 0; | |
1714 | int rc = 0; | |
1715 | ||
f19159dc | 1716 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1717 | mapping = page->mapping; |
1718 | if (!mapping) | |
1719 | return 0; | |
1720 | inode = mapping->host; | |
1721 | if (!inode) | |
3978d717 | 1722 | return; */ |
1da177e4 | 1723 | |
fb8c4b14 | 1724 | /* fill in rpages then |
1da177e4 LT |
1725 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1726 | ||
b6b38f70 | 1727 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1728 | |
3978d717 | 1729 | #if 0 |
1da177e4 LT |
1730 | if (rc < 0) |
1731 | return rc; | |
1732 | return 0; | |
3978d717 | 1733 | #endif |
1da177e4 LT |
1734 | } */ |
1735 | ||
1736 | /* | |
1737 | * As file closes, flush all cached write data for this inode checking | |
1738 | * for write behind errors. | |
1739 | */ | |
75e1fcc0 | 1740 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1741 | { |
fb8c4b14 | 1742 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1743 | int rc = 0; |
1744 | ||
1745 | /* Rather than do the steps manually: | |
1746 | lock the inode for writing | |
1747 | loop through pages looking for write behind data (dirty pages) | |
1748 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1749 | send to server (prefer in parallel) | |
1750 | deal with writebehind errors | |
1751 | unlock inode for writing | |
1752 | filemapfdatawrite appears easier for the time being */ | |
1753 | ||
1754 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1755 | /* reset wb rc if we were able to write out dirty pages */ |
1756 | if (!rc) { | |
1757 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1758 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1759 | } |
50c2f753 | 1760 | |
b6b38f70 | 1761 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1762 | |
1763 | return rc; | |
1764 | } | |
1765 | ||
1766 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1767 | size_t read_size, loff_t *poffset) | |
1768 | { | |
1769 | int rc = -EACCES; | |
1770 | unsigned int bytes_read = 0; | |
1771 | unsigned int total_read = 0; | |
1772 | unsigned int current_read_size; | |
1773 | struct cifs_sb_info *cifs_sb; | |
1774 | struct cifsTconInfo *pTcon; | |
1775 | int xid; | |
1776 | struct cifsFileInfo *open_file; | |
1777 | char *smb_read_data; | |
1778 | char __user *current_offset; | |
1779 | struct smb_com_read_rsp *pSMBr; | |
1780 | ||
1781 | xid = GetXid(); | |
e6a00296 | 1782 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1783 | pTcon = cifs_sb->tcon; |
1784 | ||
1785 | if (file->private_data == NULL) { | |
0f3bc09e | 1786 | rc = -EBADF; |
1da177e4 | 1787 | FreeXid(xid); |
0f3bc09e | 1788 | return rc; |
1da177e4 LT |
1789 | } |
1790 | open_file = (struct cifsFileInfo *)file->private_data; | |
1791 | ||
ad7a2926 | 1792 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1793 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1794 | |
1da177e4 LT |
1795 | for (total_read = 0, current_offset = read_data; |
1796 | read_size > total_read; | |
1797 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1798 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1799 | cifs_sb->rsize); |
1800 | rc = -EAGAIN; | |
1801 | smb_read_data = NULL; | |
1802 | while (rc == -EAGAIN) { | |
ec637e3f | 1803 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1804 | if ((open_file->invalidHandle) && |
1da177e4 | 1805 | (!open_file->closePend)) { |
4b18f2a9 | 1806 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1807 | if (rc != 0) |
1808 | break; | |
1809 | } | |
bfa0d75a | 1810 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1811 | open_file->netfid, |
1812 | current_read_size, *poffset, | |
1813 | &bytes_read, &smb_read_data, | |
1814 | &buf_type); | |
1da177e4 | 1815 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1816 | if (smb_read_data) { |
93544cc6 SF |
1817 | if (copy_to_user(current_offset, |
1818 | smb_read_data + | |
1819 | 4 /* RFC1001 length field */ + | |
1820 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1821 | bytes_read)) |
93544cc6 | 1822 | rc = -EFAULT; |
93544cc6 | 1823 | |
fb8c4b14 | 1824 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1825 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1826 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1827 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1828 | smb_read_data = NULL; |
1829 | } | |
1830 | } | |
1831 | if (rc || (bytes_read == 0)) { | |
1832 | if (total_read) { | |
1833 | break; | |
1834 | } else { | |
1835 | FreeXid(xid); | |
1836 | return rc; | |
1837 | } | |
1838 | } else { | |
a4544347 | 1839 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1840 | *poffset += bytes_read; |
1841 | } | |
1842 | } | |
1843 | FreeXid(xid); | |
1844 | return total_read; | |
1845 | } | |
1846 | ||
1847 | ||
1848 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1849 | loff_t *poffset) | |
1850 | { | |
1851 | int rc = -EACCES; | |
1852 | unsigned int bytes_read = 0; | |
1853 | unsigned int total_read; | |
1854 | unsigned int current_read_size; | |
1855 | struct cifs_sb_info *cifs_sb; | |
1856 | struct cifsTconInfo *pTcon; | |
1857 | int xid; | |
1858 | char *current_offset; | |
1859 | struct cifsFileInfo *open_file; | |
ec637e3f | 1860 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1861 | |
1862 | xid = GetXid(); | |
e6a00296 | 1863 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1864 | pTcon = cifs_sb->tcon; |
1865 | ||
1866 | if (file->private_data == NULL) { | |
0f3bc09e | 1867 | rc = -EBADF; |
1da177e4 | 1868 | FreeXid(xid); |
0f3bc09e | 1869 | return rc; |
1da177e4 LT |
1870 | } |
1871 | open_file = (struct cifsFileInfo *)file->private_data; | |
1872 | ||
1873 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1874 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1875 | |
fb8c4b14 | 1876 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1877 | read_size > total_read; |
1878 | total_read += bytes_read, current_offset += bytes_read) { | |
1879 | current_read_size = min_t(const int, read_size - total_read, | |
1880 | cifs_sb->rsize); | |
f9f5c817 SF |
1881 | /* For windows me and 9x we do not want to request more |
1882 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1883 | if ((pTcon->ses) && |
f9f5c817 SF |
1884 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1885 | current_read_size = min_t(const int, current_read_size, | |
1886 | pTcon->ses->server->maxBuf - 128); | |
1887 | } | |
1da177e4 LT |
1888 | rc = -EAGAIN; |
1889 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1890 | if ((open_file->invalidHandle) && |
1da177e4 | 1891 | (!open_file->closePend)) { |
4b18f2a9 | 1892 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1893 | if (rc != 0) |
1894 | break; | |
1895 | } | |
bfa0d75a | 1896 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1897 | open_file->netfid, |
1898 | current_read_size, *poffset, | |
1899 | &bytes_read, ¤t_offset, | |
1900 | &buf_type); | |
1da177e4 LT |
1901 | } |
1902 | if (rc || (bytes_read == 0)) { | |
1903 | if (total_read) { | |
1904 | break; | |
1905 | } else { | |
1906 | FreeXid(xid); | |
1907 | return rc; | |
1908 | } | |
1909 | } else { | |
a4544347 | 1910 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1911 | *poffset += bytes_read; |
1912 | } | |
1913 | } | |
1914 | FreeXid(xid); | |
1915 | return total_read; | |
1916 | } | |
1917 | ||
1918 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1919 | { | |
1da177e4 LT |
1920 | int rc, xid; |
1921 | ||
1922 | xid = GetXid(); | |
abab095d | 1923 | rc = cifs_revalidate_file(file); |
1da177e4 | 1924 | if (rc) { |
b6b38f70 | 1925 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1926 | FreeXid(xid); |
1927 | return rc; | |
1928 | } | |
1929 | rc = generic_file_mmap(file, vma); | |
1930 | FreeXid(xid); | |
1931 | return rc; | |
1932 | } | |
1933 | ||
1934 | ||
fb8c4b14 | 1935 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1936 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1937 | { |
1938 | struct page *page; | |
1939 | char *target; | |
1940 | ||
1941 | while (bytes_read > 0) { | |
1942 | if (list_empty(pages)) | |
1943 | break; | |
1944 | ||
1945 | page = list_entry(pages->prev, struct page, lru); | |
1946 | list_del(&page->lru); | |
1947 | ||
315e995c | 1948 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1949 | GFP_KERNEL)) { |
1950 | page_cache_release(page); | |
b6b38f70 | 1951 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1952 | data += PAGE_CACHE_SIZE; |
1953 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1954 | continue; |
1955 | } | |
1956 | ||
fb8c4b14 | 1957 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1958 | |
1959 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1960 | memcpy(target, data, bytes_read); | |
1961 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1962 | memset(target + bytes_read, 0, |
1da177e4 LT |
1963 | PAGE_CACHE_SIZE - bytes_read); |
1964 | bytes_read = 0; | |
1965 | } else { | |
1966 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1967 | bytes_read -= PAGE_CACHE_SIZE; | |
1968 | } | |
1969 | kunmap_atomic(target, KM_USER0); | |
1970 | ||
1971 | flush_dcache_page(page); | |
1972 | SetPageUptodate(page); | |
1973 | unlock_page(page); | |
1da177e4 LT |
1974 | data += PAGE_CACHE_SIZE; |
1975 | } | |
1976 | return; | |
1977 | } | |
1978 | ||
1979 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1980 | struct list_head *page_list, unsigned num_pages) | |
1981 | { | |
1982 | int rc = -EACCES; | |
1983 | int xid; | |
1984 | loff_t offset; | |
1985 | struct page *page; | |
1986 | struct cifs_sb_info *cifs_sb; | |
1987 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1988 | unsigned int bytes_read = 0; |
fb8c4b14 | 1989 | unsigned int read_size, i; |
1da177e4 LT |
1990 | char *smb_read_data = NULL; |
1991 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1992 | struct cifsFileInfo *open_file; |
ec637e3f | 1993 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1994 | |
1995 | xid = GetXid(); | |
1996 | if (file->private_data == NULL) { | |
0f3bc09e | 1997 | rc = -EBADF; |
1da177e4 | 1998 | FreeXid(xid); |
0f3bc09e | 1999 | return rc; |
1da177e4 LT |
2000 | } |
2001 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2002 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2003 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2004 | |
f19159dc | 2005 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
2006 | for (i = 0; i < num_pages; ) { |
2007 | unsigned contig_pages; | |
2008 | struct page *tmp_page; | |
2009 | unsigned long expected_index; | |
2010 | ||
2011 | if (list_empty(page_list)) | |
2012 | break; | |
2013 | ||
2014 | page = list_entry(page_list->prev, struct page, lru); | |
2015 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2016 | ||
2017 | /* count adjacent pages that we will read into */ | |
2018 | contig_pages = 0; | |
fb8c4b14 | 2019 | expected_index = |
1da177e4 | 2020 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2021 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2022 | if (tmp_page->index == expected_index) { |
2023 | contig_pages++; | |
2024 | expected_index++; | |
2025 | } else | |
fb8c4b14 | 2026 | break; |
1da177e4 LT |
2027 | } |
2028 | if (contig_pages + i > num_pages) | |
2029 | contig_pages = num_pages - i; | |
2030 | ||
2031 | /* for reads over a certain size could initiate async | |
2032 | read ahead */ | |
2033 | ||
2034 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2035 | /* Read size needs to be in multiples of one page */ | |
2036 | read_size = min_t(const unsigned int, read_size, | |
2037 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2038 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2039 | read_size, contig_pages); | |
1da177e4 LT |
2040 | rc = -EAGAIN; |
2041 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2042 | if ((open_file->invalidHandle) && |
1da177e4 | 2043 | (!open_file->closePend)) { |
4b18f2a9 | 2044 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2045 | if (rc != 0) |
2046 | break; | |
2047 | } | |
2048 | ||
bfa0d75a | 2049 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2050 | open_file->netfid, |
2051 | read_size, offset, | |
2052 | &bytes_read, &smb_read_data, | |
2053 | &buf_type); | |
a9d02ad4 | 2054 | /* BB more RC checks ? */ |
fb8c4b14 | 2055 | if (rc == -EAGAIN) { |
1da177e4 | 2056 | if (smb_read_data) { |
fb8c4b14 | 2057 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2058 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2059 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2060 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2061 | smb_read_data = NULL; |
2062 | } | |
2063 | } | |
2064 | } | |
2065 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2066 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2067 | break; |
2068 | } else if (bytes_read > 0) { | |
6f88cc2e | 2069 | task_io_account_read(bytes_read); |
1da177e4 LT |
2070 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2071 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2072 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2073 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2074 | |
2075 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2076 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2077 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2078 | i++; /* account for partial page */ |
2079 | ||
fb8c4b14 | 2080 | /* server copy of file can have smaller size |
1da177e4 | 2081 | than client */ |
fb8c4b14 SF |
2082 | /* BB do we need to verify this common case ? |
2083 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2084 | we will hit it on next read */ |
2085 | ||
05ac9d4b | 2086 | /* break; */ |
1da177e4 LT |
2087 | } |
2088 | } else { | |
b6b38f70 | 2089 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2090 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2091 | bytes_read, offset); |
fb8c4b14 | 2092 | /* BB turn off caching and do new lookup on |
1da177e4 | 2093 | file size at server? */ |
1da177e4 LT |
2094 | break; |
2095 | } | |
2096 | if (smb_read_data) { | |
fb8c4b14 | 2097 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2098 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2099 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2100 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2101 | smb_read_data = NULL; |
2102 | } | |
2103 | bytes_read = 0; | |
2104 | } | |
2105 | ||
1da177e4 LT |
2106 | /* need to free smb_read_data buf before exit */ |
2107 | if (smb_read_data) { | |
fb8c4b14 | 2108 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2109 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2110 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2111 | cifs_buf_release(smb_read_data); |
1da177e4 | 2112 | smb_read_data = NULL; |
fb8c4b14 | 2113 | } |
1da177e4 LT |
2114 | |
2115 | FreeXid(xid); | |
2116 | return rc; | |
2117 | } | |
2118 | ||
2119 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2120 | loff_t *poffset) | |
2121 | { | |
2122 | char *read_data; | |
2123 | int rc; | |
2124 | ||
2125 | page_cache_get(page); | |
2126 | read_data = kmap(page); | |
2127 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2128 | |
1da177e4 | 2129 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2130 | |
1da177e4 LT |
2131 | if (rc < 0) |
2132 | goto io_error; | |
2133 | else | |
b6b38f70 | 2134 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2135 | |
e6a00296 JJS |
2136 | file->f_path.dentry->d_inode->i_atime = |
2137 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2138 | |
1da177e4 LT |
2139 | if (PAGE_CACHE_SIZE > rc) |
2140 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2141 | ||
2142 | flush_dcache_page(page); | |
2143 | SetPageUptodate(page); | |
2144 | rc = 0; | |
fb8c4b14 | 2145 | |
1da177e4 | 2146 | io_error: |
fb8c4b14 | 2147 | kunmap(page); |
1da177e4 LT |
2148 | page_cache_release(page); |
2149 | return rc; | |
2150 | } | |
2151 | ||
2152 | static int cifs_readpage(struct file *file, struct page *page) | |
2153 | { | |
2154 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2155 | int rc = -EACCES; | |
2156 | int xid; | |
2157 | ||
2158 | xid = GetXid(); | |
2159 | ||
2160 | if (file->private_data == NULL) { | |
0f3bc09e | 2161 | rc = -EBADF; |
1da177e4 | 2162 | FreeXid(xid); |
0f3bc09e | 2163 | return rc; |
1da177e4 LT |
2164 | } |
2165 | ||
b6b38f70 JP |
2166 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2167 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2168 | |
2169 | rc = cifs_readpage_worker(file, page, &offset); | |
2170 | ||
2171 | unlock_page(page); | |
2172 | ||
2173 | FreeXid(xid); | |
2174 | return rc; | |
2175 | } | |
2176 | ||
a403a0a3 SF |
2177 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2178 | { | |
2179 | struct cifsFileInfo *open_file; | |
2180 | ||
2181 | read_lock(&GlobalSMBSeslock); | |
2182 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2183 | if (open_file->closePend) | |
2184 | continue; | |
2185 | if (open_file->pfile && | |
2186 | ((open_file->pfile->f_flags & O_RDWR) || | |
2187 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2188 | read_unlock(&GlobalSMBSeslock); | |
2189 | return 1; | |
2190 | } | |
2191 | } | |
2192 | read_unlock(&GlobalSMBSeslock); | |
2193 | return 0; | |
2194 | } | |
2195 | ||
1da177e4 LT |
2196 | /* We do not want to update the file size from server for inodes |
2197 | open for write - to avoid races with writepage extending | |
2198 | the file - in the future we could consider allowing | |
fb8c4b14 | 2199 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2200 | but this is tricky to do without racing with writebehind |
2201 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2202 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2203 | { |
a403a0a3 | 2204 | if (!cifsInode) |
4b18f2a9 | 2205 | return true; |
50c2f753 | 2206 | |
a403a0a3 SF |
2207 | if (is_inode_writable(cifsInode)) { |
2208 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2209 | struct cifs_sb_info *cifs_sb; |
2210 | ||
c32a0b68 | 2211 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2212 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2213 | /* since no page cache to corrupt on directio |
c32a0b68 | 2214 | we can change size safely */ |
4b18f2a9 | 2215 | return true; |
c32a0b68 SF |
2216 | } |
2217 | ||
fb8c4b14 | 2218 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2219 | return true; |
7ba52631 | 2220 | |
4b18f2a9 | 2221 | return false; |
23e7dd7d | 2222 | } else |
4b18f2a9 | 2223 | return true; |
1da177e4 LT |
2224 | } |
2225 | ||
d9414774 NP |
2226 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2227 | loff_t pos, unsigned len, unsigned flags, | |
2228 | struct page **pagep, void **fsdata) | |
1da177e4 | 2229 | { |
d9414774 NP |
2230 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2231 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2232 | loff_t page_start = pos & PAGE_MASK; |
2233 | loff_t i_size; | |
2234 | struct page *page; | |
2235 | int rc = 0; | |
d9414774 | 2236 | |
b6b38f70 | 2237 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2238 | |
54566b2c | 2239 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2240 | if (!page) { |
2241 | rc = -ENOMEM; | |
2242 | goto out; | |
2243 | } | |
8a236264 | 2244 | |
a98ee8c1 JL |
2245 | if (PageUptodate(page)) |
2246 | goto out; | |
8a236264 | 2247 | |
a98ee8c1 JL |
2248 | /* |
2249 | * If we write a full page it will be up to date, no need to read from | |
2250 | * the server. If the write is short, we'll end up doing a sync write | |
2251 | * instead. | |
2252 | */ | |
2253 | if (len == PAGE_CACHE_SIZE) | |
2254 | goto out; | |
8a236264 | 2255 | |
a98ee8c1 JL |
2256 | /* |
2257 | * optimize away the read when we have an oplock, and we're not | |
2258 | * expecting to use any of the data we'd be reading in. That | |
2259 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2260 | * and the write will cover all of the existing data. | |
2261 | */ | |
2262 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2263 | i_size = i_size_read(mapping->host); | |
2264 | if (page_start >= i_size || | |
2265 | (offset == 0 && (pos + len) >= i_size)) { | |
2266 | zero_user_segments(page, 0, offset, | |
2267 | offset + len, | |
2268 | PAGE_CACHE_SIZE); | |
2269 | /* | |
2270 | * PageChecked means that the parts of the page | |
2271 | * to which we're not writing are considered up | |
2272 | * to date. Once the data is copied to the | |
2273 | * page, it can be set uptodate. | |
2274 | */ | |
2275 | SetPageChecked(page); | |
2276 | goto out; | |
2277 | } | |
2278 | } | |
d9414774 | 2279 | |
a98ee8c1 JL |
2280 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2281 | /* | |
2282 | * might as well read a page, it is fast enough. If we get | |
2283 | * an error, we don't need to return it. cifs_write_end will | |
2284 | * do a sync write instead since PG_uptodate isn't set. | |
2285 | */ | |
2286 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2287 | } else { |
2288 | /* we could try using another file handle if there is one - | |
2289 | but how would we lock it to prevent close of that handle | |
2290 | racing with this read? In any case | |
d9414774 | 2291 | this will be written out by write_end so is fine */ |
1da177e4 | 2292 | } |
a98ee8c1 JL |
2293 | out: |
2294 | *pagep = page; | |
2295 | return rc; | |
1da177e4 LT |
2296 | } |
2297 | ||
3bc303c2 JL |
2298 | static void |
2299 | cifs_oplock_break(struct slow_work *work) | |
2300 | { | |
2301 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2302 | oplock_break); | |
2303 | struct inode *inode = cfile->pInode; | |
2304 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2305 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2306 | int rc, waitrc = 0; | |
2307 | ||
2308 | if (inode && S_ISREG(inode->i_mode)) { | |
2309 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
2310 | if (cinode->clientCanCacheAll == 0) | |
8737c930 | 2311 | break_lease(inode, O_RDONLY); |
3bc303c2 | 2312 | else if (cinode->clientCanCacheRead == 0) |
8737c930 | 2313 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2314 | #endif |
2315 | rc = filemap_fdatawrite(inode->i_mapping); | |
2316 | if (cinode->clientCanCacheRead == 0) { | |
2317 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2318 | invalidate_remote_inode(inode); | |
2319 | } | |
2320 | if (!rc) | |
2321 | rc = waitrc; | |
2322 | if (rc) | |
2323 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2324 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2325 | } |
2326 | ||
2327 | /* | |
2328 | * releasing stale oplock after recent reconnect of smb session using | |
2329 | * a now incorrect file handle is not a data integrity issue but do | |
2330 | * not bother sending an oplock release if session to server still is | |
2331 | * disconnected since oplock already released by the server | |
2332 | */ | |
2333 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2334 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2335 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2336 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 JL |
2337 | } |
2338 | } | |
2339 | ||
2340 | static int | |
2341 | cifs_oplock_break_get(struct slow_work *work) | |
2342 | { | |
2343 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2344 | oplock_break); | |
2345 | mntget(cfile->mnt); | |
2346 | cifsFileInfo_get(cfile); | |
2347 | return 0; | |
2348 | } | |
2349 | ||
2350 | static void | |
2351 | cifs_oplock_break_put(struct slow_work *work) | |
2352 | { | |
2353 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2354 | oplock_break); | |
2355 | mntput(cfile->mnt); | |
2356 | cifsFileInfo_put(cfile); | |
2357 | } | |
2358 | ||
2359 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2360 | .get_ref = cifs_oplock_break_get, | |
2361 | .put_ref = cifs_oplock_break_put, | |
2362 | .execute = cifs_oplock_break, | |
2363 | }; | |
2364 | ||
f5e54d6e | 2365 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2366 | .readpage = cifs_readpage, |
2367 | .readpages = cifs_readpages, | |
2368 | .writepage = cifs_writepage, | |
37c0eb46 | 2369 | .writepages = cifs_writepages, |
d9414774 NP |
2370 | .write_begin = cifs_write_begin, |
2371 | .write_end = cifs_write_end, | |
1da177e4 LT |
2372 | .set_page_dirty = __set_page_dirty_nobuffers, |
2373 | /* .sync_page = cifs_sync_page, */ | |
2374 | /* .direct_IO = */ | |
2375 | }; | |
273d81d6 DK |
2376 | |
2377 | /* | |
2378 | * cifs_readpages requires the server to support a buffer large enough to | |
2379 | * contain the header plus one complete page of data. Otherwise, we need | |
2380 | * to leave cifs_readpages out of the address space operations. | |
2381 | */ | |
f5e54d6e | 2382 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2383 | .readpage = cifs_readpage, |
2384 | .writepage = cifs_writepage, | |
2385 | .writepages = cifs_writepages, | |
d9414774 NP |
2386 | .write_begin = cifs_write_begin, |
2387 | .write_end = cifs_write_end, | |
273d81d6 DK |
2388 | .set_page_dirty = __set_page_dirty_nobuffers, |
2389 | /* .sync_page = cifs_sync_page, */ | |
2390 | /* .direct_IO = */ | |
2391 | }; |