Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 SF |
5 | * |
6 | * Copyright (C) International Business Machines Corp., 2002,2007 | |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
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))) { | |
139 | cFYI(1, ("inode unchanged on server")); | |
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 | } | |
146 | cFYI(1, ("invalidating remote inode since open detected it " | |
147 | "changed")); | |
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; | |
155 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
156 | file->f_path.dentry->d_inode)); | |
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)) | |
193 | cERROR(1, ("could not find file instance for " | |
194 | "new file %p", file)); | |
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 LT |
219 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
220 | cFYI(1, ("inode unchanged on server")); | |
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 LT |
228 | } |
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; | |
1da177e4 | 245 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 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 | ||
7521a3c5 | 288 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 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); | |
301 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 302 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
276a74a4 SF |
303 | cifs_sb->mnt_file_mode /* ignored */, |
304 | oflags, &oplock, &netfid, xid); | |
305 | if (rc == 0) { | |
306 | cFYI(1, ("posix open succeeded")); | |
307 | /* no need for special case handling of setting mode | |
308 | on read only files needed here */ | |
309 | ||
703a3b8e | 310 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
311 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
312 | pCifsFile, oplock, netfid); | |
313 | goto out; | |
64cc2c63 SF |
314 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
315 | if (tcon->ses->serverNOS) | |
316 | cERROR(1, ("server %s of type %s returned" | |
317 | " unexpected error on SMB posix open" | |
318 | ", disabling posix open support." | |
319 | " Check if server update available.", | |
320 | tcon->ses->serverName, | |
321 | tcon->ses->serverNOS)); | |
322 | tcon->broken_posix_open = true; | |
276a74a4 SF |
323 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
324 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
325 | goto out; | |
64cc2c63 SF |
326 | /* else fallthrough to retry open the old way on network i/o |
327 | or DFS errors */ | |
276a74a4 SF |
328 | } |
329 | ||
1da177e4 LT |
330 | desiredAccess = cifs_convert_flags(file->f_flags); |
331 | ||
332 | /********************************************************************* | |
333 | * open flag mapping table: | |
fb8c4b14 | 334 | * |
1da177e4 | 335 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 336 | * ---------- ---------------- |
1da177e4 LT |
337 | * O_CREAT FILE_OPEN_IF |
338 | * O_CREAT | O_EXCL FILE_CREATE | |
339 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
340 | * O_TRUNC FILE_OVERWRITE | |
341 | * none of the above FILE_OPEN | |
342 | * | |
343 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 344 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
345 | * O_CREAT | O_TRUNC is similar but truncates the existing |
346 | * file rather than creating a new file as FILE_SUPERSEDE does | |
347 | * (which uses the attributes / metadata passed in on open call) | |
348 | *? | |
fb8c4b14 | 349 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
350 | *? and the read write flags match reasonably. O_LARGEFILE |
351 | *? is irrelevant because largefile support is always used | |
352 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
353 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
354 | *********************************************************************/ | |
355 | ||
356 | disposition = cifs_get_disposition(file->f_flags); | |
357 | ||
1da177e4 LT |
358 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
359 | ||
360 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
361 | and calling get_inode_info with returned buf (at least helps | |
362 | non-Unix server case) */ | |
363 | ||
fb8c4b14 SF |
364 | /* BB we can not do this if this is the second open of a file |
365 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
366 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
367 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
368 | if (!buf) { | |
369 | rc = -ENOMEM; | |
370 | goto out; | |
371 | } | |
5bafd765 SF |
372 | |
373 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 374 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 375 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
376 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
377 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
378 | else |
379 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
380 | ||
a9d02ad4 SF |
381 | if (rc == -EIO) { |
382 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 383 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
384 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
385 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
386 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
387 | } | |
1da177e4 | 388 | if (rc) { |
26a21b98 | 389 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
390 | goto out; |
391 | } | |
3321b791 | 392 | |
086f68bd JL |
393 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
394 | file->f_flags); | |
395 | file->private_data = pCifsFile; | |
1da177e4 LT |
396 | if (file->private_data == NULL) { |
397 | rc = -ENOMEM; | |
398 | goto out; | |
399 | } | |
1da177e4 | 400 | |
3321b791 JL |
401 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
402 | &oplock, buf, full_path, xid); | |
1da177e4 | 403 | |
fb8c4b14 | 404 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
405 | /* time to set mode which we can not set earlier due to |
406 | problems creating new read-only files */ | |
276a74a4 | 407 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
408 | struct cifs_unix_set_info_args args = { |
409 | .mode = inode->i_mode, | |
410 | .uid = NO_CHANGE_64, | |
411 | .gid = NO_CHANGE_64, | |
412 | .ctime = NO_CHANGE_64, | |
413 | .atime = NO_CHANGE_64, | |
414 | .mtime = NO_CHANGE_64, | |
415 | .device = 0, | |
416 | }; | |
01ea95e3 JL |
417 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
418 | cifs_sb->local_nls, | |
419 | cifs_sb->mnt_cifs_flags & | |
737b758c | 420 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
421 | } |
422 | } | |
423 | ||
424 | out: | |
425 | kfree(buf); | |
426 | kfree(full_path); | |
427 | FreeXid(xid); | |
428 | return rc; | |
429 | } | |
430 | ||
0418726b | 431 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
432 | /* to server was lost */ |
433 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
434 | { | |
435 | int rc = 0; | |
436 | ||
437 | /* BB list all locks open on this file and relock */ | |
438 | ||
439 | return rc; | |
440 | } | |
441 | ||
4b18f2a9 | 442 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
443 | { |
444 | int rc = -EACCES; | |
590a3fe0 JL |
445 | int xid; |
446 | __u32 oplock; | |
1da177e4 | 447 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 448 | struct cifsTconInfo *tcon; |
1da177e4 LT |
449 | struct cifsFileInfo *pCifsFile; |
450 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 451 | struct inode *inode; |
1da177e4 LT |
452 | char *full_path = NULL; |
453 | int desiredAccess; | |
454 | int disposition = FILE_OPEN; | |
455 | __u16 netfid; | |
456 | ||
ad7a2926 | 457 | if (file->private_data) |
1da177e4 | 458 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 459 | else |
1da177e4 LT |
460 | return -EBADF; |
461 | ||
462 | xid = GetXid(); | |
f0a71eb8 | 463 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 464 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 465 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 466 | rc = 0; |
1da177e4 | 467 | FreeXid(xid); |
0f3bc09e | 468 | return rc; |
1da177e4 LT |
469 | } |
470 | ||
e6a00296 | 471 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
472 | cERROR(1, ("no valid name if dentry freed")); |
473 | dump_stack(); | |
474 | rc = -EBADF; | |
475 | goto reopen_error_exit; | |
476 | } | |
477 | ||
478 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 479 | if (inode == NULL) { |
3a9f462f SF |
480 | cERROR(1, ("inode not valid")); |
481 | dump_stack(); | |
482 | rc = -EBADF; | |
483 | goto reopen_error_exit; | |
1da177e4 | 484 | } |
50c2f753 | 485 | |
1da177e4 | 486 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 487 | tcon = cifs_sb->tcon; |
3a9f462f | 488 | |
1da177e4 LT |
489 | /* can not grab rename sem here because various ops, including |
490 | those that already have the rename sem can end up causing writepage | |
491 | to get called and if the server was down that means we end up here, | |
492 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 493 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 494 | if (full_path == NULL) { |
3a9f462f SF |
495 | rc = -ENOMEM; |
496 | reopen_error_exit: | |
f0a71eb8 | 497 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 498 | FreeXid(xid); |
3a9f462f | 499 | return rc; |
1da177e4 LT |
500 | } |
501 | ||
3a9f462f | 502 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 503 | inode, file->f_flags, full_path)); |
1da177e4 LT |
504 | |
505 | if (oplockEnabled) | |
506 | oplock = REQ_OPLOCK; | |
507 | else | |
4b18f2a9 | 508 | oplock = 0; |
1da177e4 | 509 | |
7fc8f4e9 SF |
510 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
511 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
512 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
513 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
514 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 515 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
7fc8f4e9 SF |
516 | cifs_sb->mnt_file_mode /* ignored */, |
517 | oflags, &oplock, &netfid, xid); | |
518 | if (rc == 0) { | |
519 | cFYI(1, ("posix reopen succeeded")); | |
520 | goto reopen_success; | |
521 | } | |
522 | /* fallthrough to retry open the old way on errors, especially | |
523 | in the reconnect path it is important to retry hard */ | |
524 | } | |
525 | ||
526 | desiredAccess = cifs_convert_flags(file->f_flags); | |
527 | ||
1da177e4 | 528 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
529 | by SMBOpen and then calling get_inode_info with returned buf |
530 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
531 | and server version of file size can be stale. If we knew for sure |
532 | that inode was not dirty locally we could do this */ | |
533 | ||
7fc8f4e9 | 534 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 535 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 536 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 537 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 538 | if (rc) { |
f0a71eb8 | 539 | mutex_unlock(&pCifsFile->fh_mutex); |
26a21b98 SF |
540 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
541 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 542 | } else { |
7fc8f4e9 | 543 | reopen_success: |
1da177e4 | 544 | pCifsFile->netfid = netfid; |
4b18f2a9 | 545 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 546 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
547 | pCifsInode = CIFS_I(inode); |
548 | if (pCifsInode) { | |
549 | if (can_flush) { | |
cea21805 JL |
550 | rc = filemap_write_and_wait(inode->i_mapping); |
551 | if (rc != 0) | |
552 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
553 | /* temporarily disable caching while we |
554 | go to server to get inode info */ | |
4b18f2a9 SF |
555 | pCifsInode->clientCanCacheAll = false; |
556 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 557 | if (tcon->unix_ext) |
1da177e4 LT |
558 | rc = cifs_get_inode_info_unix(&inode, |
559 | full_path, inode->i_sb, xid); | |
560 | else | |
561 | rc = cifs_get_inode_info(&inode, | |
562 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 563 | xid, NULL); |
1da177e4 LT |
564 | } /* else we are writing out data to server already |
565 | and could deadlock if we tried to flush data, and | |
566 | since we do not know if we have data that would | |
567 | invalidate the current end of file on the server | |
568 | we can not go to the server to get the new inod | |
569 | info */ | |
570 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
571 | pCifsInode->clientCanCacheAll = true; |
572 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 573 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 574 | file->f_path.dentry->d_inode)); |
1da177e4 | 575 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
576 | pCifsInode->clientCanCacheRead = true; |
577 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 578 | } else { |
4b18f2a9 SF |
579 | pCifsInode->clientCanCacheRead = false; |
580 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
581 | } |
582 | cifs_relock_file(pCifsFile); | |
583 | } | |
584 | } | |
1da177e4 LT |
585 | kfree(full_path); |
586 | FreeXid(xid); | |
587 | return rc; | |
588 | } | |
589 | ||
590 | int cifs_close(struct inode *inode, struct file *file) | |
591 | { | |
592 | int rc = 0; | |
15745320 | 593 | int xid, timeout; |
1da177e4 LT |
594 | struct cifs_sb_info *cifs_sb; |
595 | struct cifsTconInfo *pTcon; | |
596 | struct cifsFileInfo *pSMBFile = | |
597 | (struct cifsFileInfo *)file->private_data; | |
598 | ||
599 | xid = GetXid(); | |
600 | ||
601 | cifs_sb = CIFS_SB(inode->i_sb); | |
602 | pTcon = cifs_sb->tcon; | |
603 | if (pSMBFile) { | |
7ee1af76 | 604 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 605 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 606 | pSMBFile->closePend = true; |
1da177e4 LT |
607 | if (pTcon) { |
608 | /* no sense reconnecting to close a file that is | |
609 | already closed */ | |
3b795210 | 610 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 611 | write_unlock(&GlobalSMBSeslock); |
15745320 | 612 | timeout = 2; |
6ab409b5 | 613 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 614 | && (timeout <= 2048)) { |
23e7dd7d SF |
615 | /* Give write a better chance to get to |
616 | server ahead of the close. We do not | |
617 | want to add a wait_q here as it would | |
618 | increase the memory utilization as | |
619 | the struct would be in each open file, | |
fb8c4b14 | 620 | but this should give enough time to |
23e7dd7d | 621 | clear the socket */ |
90c81e0b SF |
622 | cFYI(DBG2, |
623 | ("close delay, write pending")); | |
23e7dd7d SF |
624 | msleep(timeout); |
625 | timeout *= 4; | |
4891d539 | 626 | } |
ddb4cbfc SF |
627 | if (!pTcon->need_reconnect && |
628 | !pSMBFile->invalidHandle) | |
629 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 630 | pSMBFile->netfid); |
ddb4cbfc SF |
631 | } else |
632 | write_unlock(&GlobalSMBSeslock); | |
633 | } else | |
634 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
635 | |
636 | /* Delete any outstanding lock records. | |
637 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 638 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
639 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
640 | list_del(&li->llist); | |
641 | kfree(li); | |
642 | } | |
796e5661 | 643 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 644 | |
cbe0476f | 645 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
646 | list_del(&pSMBFile->flist); |
647 | list_del(&pSMBFile->tlist); | |
cbe0476f | 648 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 649 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
650 | file->private_data = NULL; |
651 | } else | |
652 | rc = -EBADF; | |
653 | ||
4efa53f0 | 654 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
655 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
656 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
657 | /* if the file is not open we do not know if we can cache info | |
658 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
659 | CIFS_I(inode)->clientCanCacheRead = false; |
660 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 661 | } |
4efa53f0 | 662 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 663 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
664 | rc = CIFS_I(inode)->write_behind_rc; |
665 | FreeXid(xid); | |
666 | return rc; | |
667 | } | |
668 | ||
669 | int cifs_closedir(struct inode *inode, struct file *file) | |
670 | { | |
671 | int rc = 0; | |
672 | int xid; | |
673 | struct cifsFileInfo *pCFileStruct = | |
674 | (struct cifsFileInfo *)file->private_data; | |
675 | char *ptmp; | |
676 | ||
26a21b98 | 677 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
678 | |
679 | xid = GetXid(); | |
680 | ||
681 | if (pCFileStruct) { | |
682 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
683 | struct cifs_sb_info *cifs_sb = |
684 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
685 | |
686 | pTcon = cifs_sb->tcon; | |
687 | ||
688 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 689 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
690 | if (!pCFileStruct->srch_inf.endOfSearch && |
691 | !pCFileStruct->invalidHandle) { | |
692 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 693 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
694 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
695 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
696 | rc)); | |
697 | /* not much we can do if it fails anyway, ignore rc */ | |
698 | rc = 0; | |
ddb4cbfc SF |
699 | } else |
700 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
701 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
702 | if (ptmp) { | |
ec637e3f | 703 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 704 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 705 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
706 | cifs_small_buf_release(ptmp); |
707 | else | |
708 | cifs_buf_release(ptmp); | |
1da177e4 | 709 | } |
1da177e4 LT |
710 | kfree(file->private_data); |
711 | file->private_data = NULL; | |
712 | } | |
713 | /* BB can we lock the filestruct while this is going on? */ | |
714 | FreeXid(xid); | |
715 | return rc; | |
716 | } | |
717 | ||
7ee1af76 JA |
718 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
719 | __u64 offset, __u8 lockType) | |
720 | { | |
fb8c4b14 SF |
721 | struct cifsLockInfo *li = |
722 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
723 | if (li == NULL) |
724 | return -ENOMEM; | |
725 | li->offset = offset; | |
726 | li->length = len; | |
727 | li->type = lockType; | |
796e5661 | 728 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 729 | list_add(&li->llist, &fid->llist); |
796e5661 | 730 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
731 | return 0; |
732 | } | |
733 | ||
1da177e4 LT |
734 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
735 | { | |
736 | int rc, xid; | |
1da177e4 LT |
737 | __u32 numLock = 0; |
738 | __u32 numUnlock = 0; | |
739 | __u64 length; | |
4b18f2a9 | 740 | bool wait_flag = false; |
1da177e4 | 741 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 742 | struct cifsTconInfo *tcon; |
08547b03 SF |
743 | __u16 netfid; |
744 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 745 | bool posix_locking = 0; |
1da177e4 LT |
746 | |
747 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
748 | rc = -EACCES; | |
749 | xid = GetXid(); | |
750 | ||
751 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
752 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
753 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
754 | pfLock->fl_end)); | |
1da177e4 LT |
755 | |
756 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 757 | cFYI(1, ("Posix")); |
1da177e4 | 758 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 759 | cFYI(1, ("Flock")); |
1da177e4 | 760 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 761 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 762 | wait_flag = true; |
1da177e4 LT |
763 | } |
764 | if (pfLock->fl_flags & FL_ACCESS) | |
765 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 766 | "not implemented yet")); |
1da177e4 LT |
767 | if (pfLock->fl_flags & FL_LEASE) |
768 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 769 | if (pfLock->fl_flags & |
1da177e4 LT |
770 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
771 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
772 | ||
773 | if (pfLock->fl_type == F_WRLCK) { | |
774 | cFYI(1, ("F_WRLCK ")); | |
775 | numLock = 1; | |
776 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 777 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 778 | numUnlock = 1; |
d47d7c1a SF |
779 | /* Check if unlock includes more than |
780 | one lock range */ | |
1da177e4 | 781 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 782 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
783 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
784 | numLock = 1; | |
785 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 786 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
787 | numLock = 1; |
788 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 789 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
790 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
791 | numLock = 1; | |
792 | } else | |
d47d7c1a | 793 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 794 | |
e6a00296 | 795 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 796 | tcon = cifs_sb->tcon; |
1da177e4 LT |
797 | |
798 | if (file->private_data == NULL) { | |
0f3bc09e | 799 | rc = -EBADF; |
1da177e4 | 800 | FreeXid(xid); |
0f3bc09e | 801 | return rc; |
1da177e4 | 802 | } |
08547b03 SF |
803 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
804 | ||
13a6e42a SF |
805 | if ((tcon->ses->capabilities & CAP_UNIX) && |
806 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 807 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 808 | posix_locking = 1; |
08547b03 SF |
809 | /* BB add code here to normalize offset and length to |
810 | account for negative length which we can not accept over the | |
811 | wire */ | |
1da177e4 | 812 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 813 | if (posix_locking) { |
08547b03 | 814 | int posix_lock_type; |
fb8c4b14 | 815 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
816 | posix_lock_type = CIFS_RDLCK; |
817 | else | |
818 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 819 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 820 | length, pfLock, |
08547b03 SF |
821 | posix_lock_type, wait_flag); |
822 | FreeXid(xid); | |
823 | return rc; | |
824 | } | |
825 | ||
826 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 827 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 828 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 829 | if (rc == 0) { |
13a6e42a | 830 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
831 | pfLock->fl_start, 1 /* numUnlock */ , |
832 | 0 /* numLock */ , lockType, | |
833 | 0 /* wait flag */ ); | |
834 | pfLock->fl_type = F_UNLCK; | |
835 | if (rc != 0) | |
836 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 837 | "range %d during test of lock", rc)); |
1da177e4 LT |
838 | rc = 0; |
839 | ||
840 | } else { | |
841 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
842 | rc = 0; |
843 | ||
844 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
845 | pfLock->fl_type = F_WRLCK; | |
846 | } else { | |
847 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
848 | pfLock->fl_start, 0, 1, | |
849 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
850 | 0 /* wait flag */); | |
851 | if (rc == 0) { | |
852 | rc = CIFSSMBLock(xid, tcon, netfid, | |
853 | length, pfLock->fl_start, 1, 0, | |
854 | lockType | | |
855 | LOCKING_ANDX_SHARED_LOCK, | |
856 | 0 /* wait flag */); | |
857 | pfLock->fl_type = F_RDLCK; | |
858 | if (rc != 0) | |
859 | cERROR(1, ("Error unlocking " | |
860 | "previously locked range %d " | |
861 | "during test of lock", rc)); | |
862 | rc = 0; | |
863 | } else { | |
864 | pfLock->fl_type = F_WRLCK; | |
865 | rc = 0; | |
866 | } | |
867 | } | |
1da177e4 LT |
868 | } |
869 | ||
870 | FreeXid(xid); | |
871 | return rc; | |
872 | } | |
7ee1af76 JA |
873 | |
874 | if (!numLock && !numUnlock) { | |
875 | /* if no lock or unlock then nothing | |
876 | to do since we do not know what it is */ | |
877 | FreeXid(xid); | |
878 | return -EOPNOTSUPP; | |
879 | } | |
880 | ||
881 | if (posix_locking) { | |
08547b03 | 882 | int posix_lock_type; |
fb8c4b14 | 883 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
884 | posix_lock_type = CIFS_RDLCK; |
885 | else | |
886 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 887 | |
fb8c4b14 | 888 | if (numUnlock == 1) |
beb84dc8 | 889 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 890 | |
13a6e42a | 891 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 892 | length, pfLock, |
08547b03 | 893 | posix_lock_type, wait_flag); |
7ee1af76 | 894 | } else { |
fb8c4b14 SF |
895 | struct cifsFileInfo *fid = |
896 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
897 | |
898 | if (numLock) { | |
13a6e42a | 899 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 900 | pfLock->fl_start, |
7ee1af76 JA |
901 | 0, numLock, lockType, wait_flag); |
902 | ||
903 | if (rc == 0) { | |
904 | /* For Windows locks we must store them. */ | |
905 | rc = store_file_lock(fid, length, | |
906 | pfLock->fl_start, lockType); | |
907 | } | |
908 | } else if (numUnlock) { | |
909 | /* For each stored lock that this unlock overlaps | |
910 | completely, unlock it. */ | |
911 | int stored_rc = 0; | |
912 | struct cifsLockInfo *li, *tmp; | |
913 | ||
6b70c955 | 914 | rc = 0; |
796e5661 | 915 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
916 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
917 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 918 | (pfLock->fl_start + length) >= |
39db810c | 919 | (li->offset + li->length)) { |
13a6e42a | 920 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 921 | netfid, |
7ee1af76 | 922 | li->length, li->offset, |
4b18f2a9 | 923 | 1, 0, li->type, false); |
7ee1af76 JA |
924 | if (stored_rc) |
925 | rc = stored_rc; | |
926 | ||
927 | list_del(&li->llist); | |
928 | kfree(li); | |
929 | } | |
930 | } | |
796e5661 | 931 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
932 | } |
933 | } | |
934 | ||
d634cc15 | 935 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
936 | posix_lock_file_wait(file, pfLock); |
937 | FreeXid(xid); | |
938 | return rc; | |
939 | } | |
940 | ||
fbec9ab9 JL |
941 | /* |
942 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
943 | * these calls can be very long. | |
944 | * | |
945 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
946 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
947 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
948 | * welcome if someone wants to suggest one. | |
949 | * | |
950 | * We may be able to do a better job with this if there were some way to | |
951 | * declare that a file should be sparse. | |
952 | */ | |
953 | static int | |
954 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
955 | { | |
956 | if (offset <= cifsi->server_eof) | |
957 | return CIFS_STD_OP; | |
958 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
959 | return CIFS_VLONG_OP; | |
960 | else | |
961 | return CIFS_LONG_OP; | |
962 | } | |
963 | ||
964 | /* update the file size (if needed) after a write */ | |
965 | static void | |
966 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
967 | unsigned int bytes_written) | |
968 | { | |
969 | loff_t end_of_write = offset + bytes_written; | |
970 | ||
971 | if (end_of_write > cifsi->server_eof) | |
972 | cifsi->server_eof = end_of_write; | |
973 | } | |
974 | ||
1da177e4 LT |
975 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
976 | size_t write_size, loff_t *poffset) | |
977 | { | |
978 | int rc = 0; | |
979 | unsigned int bytes_written = 0; | |
980 | unsigned int total_written; | |
981 | struct cifs_sb_info *cifs_sb; | |
982 | struct cifsTconInfo *pTcon; | |
983 | int xid, long_op; | |
984 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 985 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 986 | |
e6a00296 | 987 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
988 | |
989 | pTcon = cifs_sb->tcon; | |
990 | ||
991 | /* cFYI(1, | |
992 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 993 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
994 | |
995 | if (file->private_data == NULL) | |
996 | return -EBADF; | |
c33f8d32 | 997 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 998 | |
838726c4 JL |
999 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1000 | if (rc) | |
1001 | return rc; | |
1002 | ||
1da177e4 | 1003 | xid = GetXid(); |
1da177e4 | 1004 | |
fbec9ab9 | 1005 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1006 | for (total_written = 0; write_size > total_written; |
1007 | total_written += bytes_written) { | |
1008 | rc = -EAGAIN; | |
1009 | while (rc == -EAGAIN) { | |
1010 | if (file->private_data == NULL) { | |
1011 | /* file has been closed on us */ | |
1012 | FreeXid(xid); | |
1013 | /* if we have gotten here we have written some data | |
1014 | and blocked, and the file has been freed on us while | |
1015 | we blocked so return what we managed to write */ | |
1016 | return total_written; | |
fb8c4b14 | 1017 | } |
1da177e4 LT |
1018 | if (open_file->closePend) { |
1019 | FreeXid(xid); | |
1020 | if (total_written) | |
1021 | return total_written; | |
1022 | else | |
1023 | return -EBADF; | |
1024 | } | |
1025 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1026 | /* we could deadlock if we called |
1027 | filemap_fdatawait from here so tell | |
1028 | reopen_file not to flush data to server | |
1029 | now */ | |
4b18f2a9 | 1030 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1031 | if (rc != 0) |
1032 | break; | |
1033 | } | |
1034 | ||
1035 | rc = CIFSSMBWrite(xid, pTcon, | |
1036 | open_file->netfid, | |
1037 | min_t(const int, cifs_sb->wsize, | |
1038 | write_size - total_written), | |
1039 | *poffset, &bytes_written, | |
1040 | NULL, write_data + total_written, long_op); | |
1041 | } | |
1042 | if (rc || (bytes_written == 0)) { | |
1043 | if (total_written) | |
1044 | break; | |
1045 | else { | |
1046 | FreeXid(xid); | |
1047 | return rc; | |
1048 | } | |
fbec9ab9 JL |
1049 | } else { |
1050 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1051 | *poffset += bytes_written; |
fbec9ab9 | 1052 | } |
133672ef | 1053 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1054 | 15 seconds is plenty */ |
1055 | } | |
1056 | ||
a4544347 | 1057 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1058 | |
1059 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1060 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1061 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1062 | /* Do not update local mtime - server will set its actual value on write |
1063 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1064 | * current_fs_time(inode->i_sb);*/ |
1065 | if (total_written > 0) { | |
1066 | spin_lock(&inode->i_lock); | |
1067 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1068 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1069 | *poffset); |
3677db10 | 1070 | spin_unlock(&inode->i_lock); |
1da177e4 | 1071 | } |
fb8c4b14 | 1072 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1073 | } |
1074 | FreeXid(xid); | |
1075 | return total_written; | |
1076 | } | |
1077 | ||
1078 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1079 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1080 | { |
1081 | int rc = 0; | |
1082 | unsigned int bytes_written = 0; | |
1083 | unsigned int total_written; | |
1084 | struct cifs_sb_info *cifs_sb; | |
1085 | struct cifsTconInfo *pTcon; | |
1086 | int xid, long_op; | |
1087 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1088 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1089 | |
e6a00296 | 1090 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1091 | |
1092 | pTcon = cifs_sb->tcon; | |
1093 | ||
fb8c4b14 | 1094 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1095 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1096 | |
1097 | if (file->private_data == NULL) | |
1098 | return -EBADF; | |
c33f8d32 | 1099 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1100 | |
1da177e4 | 1101 | xid = GetXid(); |
1da177e4 | 1102 | |
fbec9ab9 | 1103 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1104 | for (total_written = 0; write_size > total_written; |
1105 | total_written += bytes_written) { | |
1106 | rc = -EAGAIN; | |
1107 | while (rc == -EAGAIN) { | |
1108 | if (file->private_data == NULL) { | |
1109 | /* file has been closed on us */ | |
1110 | FreeXid(xid); | |
1111 | /* if we have gotten here we have written some data | |
1112 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1113 | while we blocked so return what we managed to |
1da177e4 LT |
1114 | write */ |
1115 | return total_written; | |
fb8c4b14 | 1116 | } |
1da177e4 LT |
1117 | if (open_file->closePend) { |
1118 | FreeXid(xid); | |
1119 | if (total_written) | |
1120 | return total_written; | |
1121 | else | |
1122 | return -EBADF; | |
1123 | } | |
1124 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1125 | /* we could deadlock if we called |
1126 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1127 | reopen_file not to flush data to |
1da177e4 | 1128 | server now */ |
4b18f2a9 | 1129 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1130 | if (rc != 0) |
1131 | break; | |
1132 | } | |
fb8c4b14 SF |
1133 | if (experimEnabled || (pTcon->ses->server && |
1134 | ((pTcon->ses->server->secMode & | |
08775834 | 1135 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1136 | == 0))) { |
3e84469d SF |
1137 | struct kvec iov[2]; |
1138 | unsigned int len; | |
1139 | ||
0ae0efad | 1140 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1141 | write_size - total_written); |
1142 | /* iov[0] is reserved for smb header */ | |
1143 | iov[1].iov_base = (char *)write_data + | |
1144 | total_written; | |
1145 | iov[1].iov_len = len; | |
d6e04ae6 | 1146 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1147 | open_file->netfid, len, |
d6e04ae6 | 1148 | *poffset, &bytes_written, |
3e84469d | 1149 | iov, 1, long_op); |
d6e04ae6 | 1150 | } else |
60808233 SF |
1151 | rc = CIFSSMBWrite(xid, pTcon, |
1152 | open_file->netfid, | |
1153 | min_t(const int, cifs_sb->wsize, | |
1154 | write_size - total_written), | |
1155 | *poffset, &bytes_written, | |
1156 | write_data + total_written, | |
1157 | NULL, long_op); | |
1da177e4 LT |
1158 | } |
1159 | if (rc || (bytes_written == 0)) { | |
1160 | if (total_written) | |
1161 | break; | |
1162 | else { | |
1163 | FreeXid(xid); | |
1164 | return rc; | |
1165 | } | |
fbec9ab9 JL |
1166 | } else { |
1167 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1168 | *poffset += bytes_written; |
fbec9ab9 | 1169 | } |
133672ef | 1170 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1171 | 15 seconds is plenty */ |
1172 | } | |
1173 | ||
a4544347 | 1174 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1175 | |
1176 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1177 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1178 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1179 | /* file->f_path.dentry->d_inode->i_ctime = |
1180 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1181 | if (total_written > 0) { | |
1182 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1183 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1184 | i_size_write(file->f_path.dentry->d_inode, | |
1185 | *poffset); | |
1186 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1187 | } |
3677db10 | 1188 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1189 | } |
1190 | FreeXid(xid); | |
1191 | return total_written; | |
1192 | } | |
1193 | ||
630f3f0c SF |
1194 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1195 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1196 | { | |
1197 | struct cifsFileInfo *open_file = NULL; | |
1198 | ||
1199 | read_lock(&GlobalSMBSeslock); | |
1200 | /* we could simply get the first_list_entry since write-only entries | |
1201 | are always at the end of the list but since the first entry might | |
1202 | have a close pending, we go through the whole list */ | |
1203 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1204 | if (open_file->closePend) | |
1205 | continue; | |
1206 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1207 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1208 | if (!open_file->invalidHandle) { | |
1209 | /* found a good file */ | |
1210 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1211 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1212 | read_unlock(&GlobalSMBSeslock); |
1213 | return open_file; | |
1214 | } /* else might as well continue, and look for | |
1215 | another, or simply have the caller reopen it | |
1216 | again rather than trying to fix this handle */ | |
1217 | } else /* write only file */ | |
1218 | break; /* write only files are last so must be done */ | |
1219 | } | |
1220 | read_unlock(&GlobalSMBSeslock); | |
1221 | return NULL; | |
1222 | } | |
1223 | #endif | |
1224 | ||
dd99cd80 | 1225 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1226 | { |
1227 | struct cifsFileInfo *open_file; | |
2846d386 | 1228 | bool any_available = false; |
dd99cd80 | 1229 | int rc; |
6148a742 | 1230 | |
60808233 SF |
1231 | /* Having a null inode here (because mapping->host was set to zero by |
1232 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1233 | it being zero) during stress testcases so we need to check for it */ | |
1234 | ||
fb8c4b14 SF |
1235 | if (cifs_inode == NULL) { |
1236 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1237 | dump_stack(); |
1238 | return NULL; | |
1239 | } | |
1240 | ||
6148a742 | 1241 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1242 | refind_writable: |
6148a742 | 1243 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1244 | if (open_file->closePend || |
1245 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1246 | continue; |
2846d386 | 1247 | |
6148a742 SF |
1248 | if (open_file->pfile && |
1249 | ((open_file->pfile->f_flags & O_RDWR) || | |
1250 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1251 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1252 | |
1253 | if (!open_file->invalidHandle) { | |
1254 | /* found a good writable file */ | |
1255 | read_unlock(&GlobalSMBSeslock); | |
1256 | return open_file; | |
1257 | } | |
8840dee9 | 1258 | |
6148a742 | 1259 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1260 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1261 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1262 | if (!rc) { |
9b22b0b7 SF |
1263 | if (!open_file->closePend) |
1264 | return open_file; | |
1265 | else { /* start over in case this was deleted */ | |
1266 | /* since the list could be modified */ | |
37c0eb46 | 1267 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1268 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1269 | goto refind_writable; |
37c0eb46 SF |
1270 | } |
1271 | } | |
9b22b0b7 SF |
1272 | |
1273 | /* if it fails, try another handle if possible - | |
1274 | (we can not do this if closePending since | |
1275 | loop could be modified - in which case we | |
1276 | have to start at the beginning of the list | |
1277 | again. Note that it would be bad | |
1278 | to hold up writepages here (rather than | |
1279 | in caller) with continuous retries */ | |
1280 | cFYI(1, ("wp failed on reopen file")); | |
1281 | read_lock(&GlobalSMBSeslock); | |
1282 | /* can not use this handle, no write | |
1283 | pending on this one after all */ | |
6ab409b5 | 1284 | cifsFileInfo_put(open_file); |
8840dee9 | 1285 | |
9b22b0b7 SF |
1286 | if (open_file->closePend) /* list could have changed */ |
1287 | goto refind_writable; | |
1288 | /* else we simply continue to the next entry. Thus | |
1289 | we do not loop on reopen errors. If we | |
1290 | can not reopen the file, for example if we | |
1291 | reconnected to a server with another client | |
1292 | racing to delete or lock the file we would not | |
1293 | make progress if we restarted before the beginning | |
1294 | of the loop here. */ | |
6148a742 SF |
1295 | } |
1296 | } | |
2846d386 JL |
1297 | /* couldn't find useable FH with same pid, try any available */ |
1298 | if (!any_available) { | |
1299 | any_available = true; | |
1300 | goto refind_writable; | |
1301 | } | |
6148a742 SF |
1302 | read_unlock(&GlobalSMBSeslock); |
1303 | return NULL; | |
1304 | } | |
1305 | ||
1da177e4 LT |
1306 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1307 | { | |
1308 | struct address_space *mapping = page->mapping; | |
1309 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1310 | char *write_data; | |
1311 | int rc = -EFAULT; | |
1312 | int bytes_written = 0; | |
1313 | struct cifs_sb_info *cifs_sb; | |
1314 | struct cifsTconInfo *pTcon; | |
1315 | struct inode *inode; | |
6148a742 | 1316 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1317 | |
1318 | if (!mapping || !mapping->host) | |
1319 | return -EFAULT; | |
1320 | ||
1321 | inode = page->mapping->host; | |
1322 | cifs_sb = CIFS_SB(inode->i_sb); | |
1323 | pTcon = cifs_sb->tcon; | |
1324 | ||
1325 | offset += (loff_t)from; | |
1326 | write_data = kmap(page); | |
1327 | write_data += from; | |
1328 | ||
1329 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1330 | kunmap(page); | |
1331 | return -EIO; | |
1332 | } | |
1333 | ||
1334 | /* racing with truncate? */ | |
1335 | if (offset > mapping->host->i_size) { | |
1336 | kunmap(page); | |
1337 | return 0; /* don't care */ | |
1338 | } | |
1339 | ||
1340 | /* check to make sure that we are not extending the file */ | |
1341 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1342 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1343 | |
6148a742 SF |
1344 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1345 | if (open_file) { | |
1346 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1347 | to-from, &offset); | |
6ab409b5 | 1348 | cifsFileInfo_put(open_file); |
1da177e4 | 1349 | /* Does mm or vfs already set times? */ |
6148a742 | 1350 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1351 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1352 | rc = 0; |
bb5a9a04 SF |
1353 | else if (bytes_written < 0) |
1354 | rc = bytes_written; | |
6148a742 | 1355 | } else { |
1da177e4 LT |
1356 | cFYI(1, ("No writeable filehandles for inode")); |
1357 | rc = -EIO; | |
1358 | } | |
1359 | ||
1360 | kunmap(page); | |
1361 | return rc; | |
1362 | } | |
1363 | ||
1da177e4 | 1364 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1365 | struct writeback_control *wbc) |
1da177e4 | 1366 | { |
37c0eb46 SF |
1367 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1368 | unsigned int bytes_to_write; | |
1369 | unsigned int bytes_written; | |
1370 | struct cifs_sb_info *cifs_sb; | |
1371 | int done = 0; | |
111ebb6e | 1372 | pgoff_t end; |
37c0eb46 | 1373 | pgoff_t index; |
fb8c4b14 SF |
1374 | int range_whole = 0; |
1375 | struct kvec *iov; | |
84d2f07e | 1376 | int len; |
37c0eb46 SF |
1377 | int n_iov = 0; |
1378 | pgoff_t next; | |
1379 | int nr_pages; | |
1380 | __u64 offset = 0; | |
23e7dd7d | 1381 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1382 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1383 | struct page *page; |
1384 | struct pagevec pvec; | |
1385 | int rc = 0; | |
1386 | int scanned = 0; | |
fbec9ab9 | 1387 | int xid, long_op; |
1da177e4 | 1388 | |
37c0eb46 | 1389 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1390 | |
37c0eb46 SF |
1391 | /* |
1392 | * If wsize is smaller that the page cache size, default to writing | |
1393 | * one page at a time via cifs_writepage | |
1394 | */ | |
1395 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1396 | return generic_writepages(mapping, wbc); | |
1397 | ||
fb8c4b14 SF |
1398 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1399 | if (cifs_sb->tcon->ses->server->secMode & | |
1400 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1401 | if (!experimEnabled) | |
60808233 | 1402 | return generic_writepages(mapping, wbc); |
4a77118c | 1403 | |
9a0c8230 | 1404 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1405 | if (iov == NULL) |
9a0c8230 SF |
1406 | return generic_writepages(mapping, wbc); |
1407 | ||
1408 | ||
37c0eb46 SF |
1409 | /* |
1410 | * BB: Is this meaningful for a non-block-device file system? | |
1411 | * If it is, we should test it again after we do I/O | |
1412 | */ | |
1413 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1414 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1415 | kfree(iov); |
37c0eb46 SF |
1416 | return 0; |
1417 | } | |
1418 | ||
1da177e4 LT |
1419 | xid = GetXid(); |
1420 | ||
37c0eb46 | 1421 | pagevec_init(&pvec, 0); |
111ebb6e | 1422 | if (wbc->range_cyclic) { |
37c0eb46 | 1423 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1424 | end = -1; |
1425 | } else { | |
1426 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1427 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1428 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1429 | range_whole = 1; | |
37c0eb46 SF |
1430 | scanned = 1; |
1431 | } | |
1432 | retry: | |
1433 | while (!done && (index <= end) && | |
1434 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1435 | PAGECACHE_TAG_DIRTY, | |
1436 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1437 | int first; | |
1438 | unsigned int i; | |
1439 | ||
37c0eb46 SF |
1440 | first = -1; |
1441 | next = 0; | |
1442 | n_iov = 0; | |
1443 | bytes_to_write = 0; | |
1444 | ||
1445 | for (i = 0; i < nr_pages; i++) { | |
1446 | page = pvec.pages[i]; | |
1447 | /* | |
1448 | * At this point we hold neither mapping->tree_lock nor | |
1449 | * lock on the page itself: the page may be truncated or | |
1450 | * invalidated (changing page->mapping to NULL), or even | |
1451 | * swizzled back from swapper_space to tmpfs file | |
1452 | * mapping | |
1453 | */ | |
1454 | ||
1455 | if (first < 0) | |
1456 | lock_page(page); | |
529ae9aa | 1457 | else if (!trylock_page(page)) |
37c0eb46 SF |
1458 | break; |
1459 | ||
1460 | if (unlikely(page->mapping != mapping)) { | |
1461 | unlock_page(page); | |
1462 | break; | |
1463 | } | |
1464 | ||
111ebb6e | 1465 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1466 | done = 1; |
1467 | unlock_page(page); | |
1468 | break; | |
1469 | } | |
1470 | ||
1471 | if (next && (page->index != next)) { | |
1472 | /* Not next consecutive page */ | |
1473 | unlock_page(page); | |
1474 | break; | |
1475 | } | |
1476 | ||
1477 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1478 | wait_on_page_writeback(page); | |
1479 | ||
1480 | if (PageWriteback(page) || | |
cb876f45 | 1481 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1482 | unlock_page(page); |
1483 | break; | |
1484 | } | |
84d2f07e | 1485 | |
cb876f45 LT |
1486 | /* |
1487 | * This actually clears the dirty bit in the radix tree. | |
1488 | * See cifs_writepage() for more commentary. | |
1489 | */ | |
1490 | set_page_writeback(page); | |
1491 | ||
84d2f07e SF |
1492 | if (page_offset(page) >= mapping->host->i_size) { |
1493 | done = 1; | |
1494 | unlock_page(page); | |
cb876f45 | 1495 | end_page_writeback(page); |
84d2f07e SF |
1496 | break; |
1497 | } | |
1498 | ||
37c0eb46 SF |
1499 | /* |
1500 | * BB can we get rid of this? pages are held by pvec | |
1501 | */ | |
1502 | page_cache_get(page); | |
1503 | ||
84d2f07e SF |
1504 | len = min(mapping->host->i_size - page_offset(page), |
1505 | (loff_t)PAGE_CACHE_SIZE); | |
1506 | ||
37c0eb46 SF |
1507 | /* reserve iov[0] for the smb header */ |
1508 | n_iov++; | |
1509 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1510 | iov[n_iov].iov_len = len; |
1511 | bytes_to_write += len; | |
37c0eb46 SF |
1512 | |
1513 | if (first < 0) { | |
1514 | first = i; | |
1515 | offset = page_offset(page); | |
1516 | } | |
1517 | next = page->index + 1; | |
1518 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1519 | break; | |
1520 | } | |
1521 | if (n_iov) { | |
23e7dd7d SF |
1522 | /* Search for a writable handle every time we call |
1523 | * CIFSSMBWrite2. We can't rely on the last handle | |
1524 | * we used to still be valid | |
1525 | */ | |
1526 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1527 | if (!open_file) { | |
1528 | cERROR(1, ("No writable handles for inode")); | |
1529 | rc = -EBADF; | |
1047abc1 | 1530 | } else { |
fbec9ab9 | 1531 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1532 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1533 | open_file->netfid, | |
1534 | bytes_to_write, offset, | |
1535 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1536 | long_op); |
6ab409b5 | 1537 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1538 | cifs_update_eof(cifsi, offset, bytes_written); |
1539 | ||
23e7dd7d | 1540 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1541 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1542 | rc, bytes_written)); |
1543 | /* BB what if continued retry is | |
1544 | requested via mount flags? */ | |
cea21805 JL |
1545 | if (rc == -ENOSPC) |
1546 | set_bit(AS_ENOSPC, &mapping->flags); | |
1547 | else | |
1548 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1549 | } else { |
1550 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1551 | bytes_written); | |
1552 | } | |
37c0eb46 SF |
1553 | } |
1554 | for (i = 0; i < n_iov; i++) { | |
1555 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1556 | /* Should we also set page error on |
1557 | success rc but too little data written? */ | |
1558 | /* BB investigate retry logic on temporary | |
1559 | server crash cases and how recovery works | |
fb8c4b14 SF |
1560 | when page marked as error */ |
1561 | if (rc) | |
eb9bdaa3 | 1562 | SetPageError(page); |
37c0eb46 SF |
1563 | kunmap(page); |
1564 | unlock_page(page); | |
cb876f45 | 1565 | end_page_writeback(page); |
37c0eb46 SF |
1566 | page_cache_release(page); |
1567 | } | |
1568 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1569 | done = 1; | |
1570 | index = next; | |
b066a48c DK |
1571 | } else |
1572 | /* Need to re-find the pages we skipped */ | |
1573 | index = pvec.pages[0]->index + 1; | |
1574 | ||
37c0eb46 SF |
1575 | pagevec_release(&pvec); |
1576 | } | |
1577 | if (!scanned && !done) { | |
1578 | /* | |
1579 | * We hit the last page and there is more work to be done: wrap | |
1580 | * back to the start of the file | |
1581 | */ | |
1582 | scanned = 1; | |
1583 | index = 0; | |
1584 | goto retry; | |
1585 | } | |
111ebb6e | 1586 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1587 | mapping->writeback_index = index; |
1588 | ||
1da177e4 | 1589 | FreeXid(xid); |
9a0c8230 | 1590 | kfree(iov); |
1da177e4 LT |
1591 | return rc; |
1592 | } | |
1da177e4 | 1593 | |
fb8c4b14 | 1594 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1595 | { |
1596 | int rc = -EFAULT; | |
1597 | int xid; | |
1598 | ||
1599 | xid = GetXid(); | |
1600 | /* BB add check for wbc flags */ | |
1601 | page_cache_get(page); | |
ad7a2926 | 1602 | if (!PageUptodate(page)) |
1da177e4 | 1603 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1604 | |
1605 | /* | |
1606 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1607 | * | |
1608 | * A writepage() implementation always needs to do either this, | |
1609 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1610 | * the case of a failure. | |
1611 | * | |
1612 | * Just unlocking the page will cause the radix tree tag-bits | |
1613 | * to fail to update with the state of the page correctly. | |
1614 | */ | |
fb8c4b14 | 1615 | set_page_writeback(page); |
1da177e4 LT |
1616 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1617 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1618 | unlock_page(page); | |
cb876f45 LT |
1619 | end_page_writeback(page); |
1620 | page_cache_release(page); | |
1da177e4 LT |
1621 | FreeXid(xid); |
1622 | return rc; | |
1623 | } | |
1624 | ||
d9414774 NP |
1625 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1626 | loff_t pos, unsigned len, unsigned copied, | |
1627 | struct page *page, void *fsdata) | |
1da177e4 | 1628 | { |
d9414774 NP |
1629 | int rc; |
1630 | struct inode *inode = mapping->host; | |
1da177e4 | 1631 | |
d9414774 NP |
1632 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1633 | page, pos, copied)); | |
1634 | ||
a98ee8c1 JL |
1635 | if (PageChecked(page)) { |
1636 | if (copied == len) | |
1637 | SetPageUptodate(page); | |
1638 | ClearPageChecked(page); | |
1639 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1640 | SetPageUptodate(page); |
ad7a2926 | 1641 | |
1da177e4 | 1642 | if (!PageUptodate(page)) { |
d9414774 NP |
1643 | char *page_data; |
1644 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1645 | int xid; | |
1646 | ||
1647 | xid = GetXid(); | |
1da177e4 LT |
1648 | /* this is probably better than directly calling |
1649 | partialpage_write since in this function the file handle is | |
1650 | known which we might as well leverage */ | |
1651 | /* BB check if anything else missing out of ppw | |
1652 | such as updating last write time */ | |
1653 | page_data = kmap(page); | |
d9414774 NP |
1654 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1655 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1656 | kunmap(page); |
d9414774 NP |
1657 | |
1658 | FreeXid(xid); | |
fb8c4b14 | 1659 | } else { |
d9414774 NP |
1660 | rc = copied; |
1661 | pos += copied; | |
1da177e4 LT |
1662 | set_page_dirty(page); |
1663 | } | |
1664 | ||
d9414774 NP |
1665 | if (rc > 0) { |
1666 | spin_lock(&inode->i_lock); | |
1667 | if (pos > inode->i_size) | |
1668 | i_size_write(inode, pos); | |
1669 | spin_unlock(&inode->i_lock); | |
1670 | } | |
1671 | ||
1672 | unlock_page(page); | |
1673 | page_cache_release(page); | |
1674 | ||
1da177e4 LT |
1675 | return rc; |
1676 | } | |
1677 | ||
1678 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1679 | { | |
1680 | int xid; | |
1681 | int rc = 0; | |
b298f223 SF |
1682 | struct cifsTconInfo *tcon; |
1683 | struct cifsFileInfo *smbfile = | |
1684 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1685 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1686 | |
1687 | xid = GetXid(); | |
1688 | ||
fb8c4b14 | 1689 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1690 | dentry->d_name.name, datasync)); |
50c2f753 | 1691 | |
cea21805 JL |
1692 | rc = filemap_write_and_wait(inode->i_mapping); |
1693 | if (rc == 0) { | |
1694 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1695 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1696 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1697 | if (!rc && tcon && smbfile && |
4717bed6 | 1698 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1699 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1700 | } |
b298f223 | 1701 | |
1da177e4 LT |
1702 | FreeXid(xid); |
1703 | return rc; | |
1704 | } | |
1705 | ||
3978d717 | 1706 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1707 | { |
1708 | struct address_space *mapping; | |
1709 | struct inode *inode; | |
1710 | unsigned long index = page->index; | |
1711 | unsigned int rpages = 0; | |
1712 | int rc = 0; | |
1713 | ||
1714 | cFYI(1, ("sync page %p",page)); | |
1715 | mapping = page->mapping; | |
1716 | if (!mapping) | |
1717 | return 0; | |
1718 | inode = mapping->host; | |
1719 | if (!inode) | |
3978d717 | 1720 | return; */ |
1da177e4 | 1721 | |
fb8c4b14 | 1722 | /* fill in rpages then |
1da177e4 LT |
1723 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1724 | ||
26a21b98 | 1725 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1726 | |
3978d717 | 1727 | #if 0 |
1da177e4 LT |
1728 | if (rc < 0) |
1729 | return rc; | |
1730 | return 0; | |
3978d717 | 1731 | #endif |
1da177e4 LT |
1732 | } */ |
1733 | ||
1734 | /* | |
1735 | * As file closes, flush all cached write data for this inode checking | |
1736 | * for write behind errors. | |
1737 | */ | |
75e1fcc0 | 1738 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1739 | { |
fb8c4b14 | 1740 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1741 | int rc = 0; |
1742 | ||
1743 | /* Rather than do the steps manually: | |
1744 | lock the inode for writing | |
1745 | loop through pages looking for write behind data (dirty pages) | |
1746 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1747 | send to server (prefer in parallel) | |
1748 | deal with writebehind errors | |
1749 | unlock inode for writing | |
1750 | filemapfdatawrite appears easier for the time being */ | |
1751 | ||
1752 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1753 | /* reset wb rc if we were able to write out dirty pages */ |
1754 | if (!rc) { | |
1755 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1756 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1757 | } |
50c2f753 | 1758 | |
fb8c4b14 | 1759 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1760 | |
1761 | return rc; | |
1762 | } | |
1763 | ||
1764 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1765 | size_t read_size, loff_t *poffset) | |
1766 | { | |
1767 | int rc = -EACCES; | |
1768 | unsigned int bytes_read = 0; | |
1769 | unsigned int total_read = 0; | |
1770 | unsigned int current_read_size; | |
1771 | struct cifs_sb_info *cifs_sb; | |
1772 | struct cifsTconInfo *pTcon; | |
1773 | int xid; | |
1774 | struct cifsFileInfo *open_file; | |
1775 | char *smb_read_data; | |
1776 | char __user *current_offset; | |
1777 | struct smb_com_read_rsp *pSMBr; | |
1778 | ||
1779 | xid = GetXid(); | |
e6a00296 | 1780 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1781 | pTcon = cifs_sb->tcon; |
1782 | ||
1783 | if (file->private_data == NULL) { | |
0f3bc09e | 1784 | rc = -EBADF; |
1da177e4 | 1785 | FreeXid(xid); |
0f3bc09e | 1786 | return rc; |
1da177e4 LT |
1787 | } |
1788 | open_file = (struct cifsFileInfo *)file->private_data; | |
1789 | ||
ad7a2926 | 1790 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1791 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1792 | |
1da177e4 LT |
1793 | for (total_read = 0, current_offset = read_data; |
1794 | read_size > total_read; | |
1795 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1796 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1797 | cifs_sb->rsize); |
1798 | rc = -EAGAIN; | |
1799 | smb_read_data = NULL; | |
1800 | while (rc == -EAGAIN) { | |
ec637e3f | 1801 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1802 | if ((open_file->invalidHandle) && |
1da177e4 | 1803 | (!open_file->closePend)) { |
4b18f2a9 | 1804 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1805 | if (rc != 0) |
1806 | break; | |
1807 | } | |
bfa0d75a | 1808 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1809 | open_file->netfid, |
1810 | current_read_size, *poffset, | |
1811 | &bytes_read, &smb_read_data, | |
1812 | &buf_type); | |
1da177e4 | 1813 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1814 | if (smb_read_data) { |
93544cc6 SF |
1815 | if (copy_to_user(current_offset, |
1816 | smb_read_data + | |
1817 | 4 /* RFC1001 length field */ + | |
1818 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1819 | bytes_read)) |
93544cc6 | 1820 | rc = -EFAULT; |
93544cc6 | 1821 | |
fb8c4b14 | 1822 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1823 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1824 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1825 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1826 | smb_read_data = NULL; |
1827 | } | |
1828 | } | |
1829 | if (rc || (bytes_read == 0)) { | |
1830 | if (total_read) { | |
1831 | break; | |
1832 | } else { | |
1833 | FreeXid(xid); | |
1834 | return rc; | |
1835 | } | |
1836 | } else { | |
a4544347 | 1837 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1838 | *poffset += bytes_read; |
1839 | } | |
1840 | } | |
1841 | FreeXid(xid); | |
1842 | return total_read; | |
1843 | } | |
1844 | ||
1845 | ||
1846 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1847 | loff_t *poffset) | |
1848 | { | |
1849 | int rc = -EACCES; | |
1850 | unsigned int bytes_read = 0; | |
1851 | unsigned int total_read; | |
1852 | unsigned int current_read_size; | |
1853 | struct cifs_sb_info *cifs_sb; | |
1854 | struct cifsTconInfo *pTcon; | |
1855 | int xid; | |
1856 | char *current_offset; | |
1857 | struct cifsFileInfo *open_file; | |
ec637e3f | 1858 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1859 | |
1860 | xid = GetXid(); | |
e6a00296 | 1861 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1862 | pTcon = cifs_sb->tcon; |
1863 | ||
1864 | if (file->private_data == NULL) { | |
0f3bc09e | 1865 | rc = -EBADF; |
1da177e4 | 1866 | FreeXid(xid); |
0f3bc09e | 1867 | return rc; |
1da177e4 LT |
1868 | } |
1869 | open_file = (struct cifsFileInfo *)file->private_data; | |
1870 | ||
1871 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1872 | cFYI(1, ("attempting read on write only file instance")); | |
1873 | ||
fb8c4b14 | 1874 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1875 | read_size > total_read; |
1876 | total_read += bytes_read, current_offset += bytes_read) { | |
1877 | current_read_size = min_t(const int, read_size - total_read, | |
1878 | cifs_sb->rsize); | |
f9f5c817 SF |
1879 | /* For windows me and 9x we do not want to request more |
1880 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1881 | if ((pTcon->ses) && |
f9f5c817 SF |
1882 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1883 | current_read_size = min_t(const int, current_read_size, | |
1884 | pTcon->ses->server->maxBuf - 128); | |
1885 | } | |
1da177e4 LT |
1886 | rc = -EAGAIN; |
1887 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1888 | if ((open_file->invalidHandle) && |
1da177e4 | 1889 | (!open_file->closePend)) { |
4b18f2a9 | 1890 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1891 | if (rc != 0) |
1892 | break; | |
1893 | } | |
bfa0d75a | 1894 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1895 | open_file->netfid, |
1896 | current_read_size, *poffset, | |
1897 | &bytes_read, ¤t_offset, | |
1898 | &buf_type); | |
1da177e4 LT |
1899 | } |
1900 | if (rc || (bytes_read == 0)) { | |
1901 | if (total_read) { | |
1902 | break; | |
1903 | } else { | |
1904 | FreeXid(xid); | |
1905 | return rc; | |
1906 | } | |
1907 | } else { | |
a4544347 | 1908 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1909 | *poffset += bytes_read; |
1910 | } | |
1911 | } | |
1912 | FreeXid(xid); | |
1913 | return total_read; | |
1914 | } | |
1915 | ||
1916 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1917 | { | |
1da177e4 LT |
1918 | int rc, xid; |
1919 | ||
1920 | xid = GetXid(); | |
abab095d | 1921 | rc = cifs_revalidate_file(file); |
1da177e4 LT |
1922 | if (rc) { |
1923 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1924 | FreeXid(xid); | |
1925 | return rc; | |
1926 | } | |
1927 | rc = generic_file_mmap(file, vma); | |
1928 | FreeXid(xid); | |
1929 | return rc; | |
1930 | } | |
1931 | ||
1932 | ||
fb8c4b14 | 1933 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1934 | struct list_head *pages, int bytes_read, char *data, |
1935 | struct pagevec *plru_pvec) | |
1936 | { | |
1937 | struct page *page; | |
1938 | char *target; | |
1939 | ||
1940 | while (bytes_read > 0) { | |
1941 | if (list_empty(pages)) | |
1942 | break; | |
1943 | ||
1944 | page = list_entry(pages->prev, struct page, lru); | |
1945 | list_del(&page->lru); | |
1946 | ||
1947 | if (add_to_page_cache(page, mapping, page->index, | |
1948 | GFP_KERNEL)) { | |
1949 | page_cache_release(page); | |
1950 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1951 | data += PAGE_CACHE_SIZE; |
1952 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1953 | continue; |
1954 | } | |
1955 | ||
fb8c4b14 | 1956 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1957 | |
1958 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1959 | memcpy(target, data, bytes_read); | |
1960 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1961 | memset(target + bytes_read, 0, |
1da177e4 LT |
1962 | PAGE_CACHE_SIZE - bytes_read); |
1963 | bytes_read = 0; | |
1964 | } else { | |
1965 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1966 | bytes_read -= PAGE_CACHE_SIZE; | |
1967 | } | |
1968 | kunmap_atomic(target, KM_USER0); | |
1969 | ||
1970 | flush_dcache_page(page); | |
1971 | SetPageUptodate(page); | |
1972 | unlock_page(page); | |
1973 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 1974 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
1975 | data += PAGE_CACHE_SIZE; |
1976 | } | |
1977 | return; | |
1978 | } | |
1979 | ||
1980 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1981 | struct list_head *page_list, unsigned num_pages) | |
1982 | { | |
1983 | int rc = -EACCES; | |
1984 | int xid; | |
1985 | loff_t offset; | |
1986 | struct page *page; | |
1987 | struct cifs_sb_info *cifs_sb; | |
1988 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1989 | unsigned int bytes_read = 0; |
fb8c4b14 | 1990 | unsigned int read_size, i; |
1da177e4 LT |
1991 | char *smb_read_data = NULL; |
1992 | struct smb_com_read_rsp *pSMBr; | |
1993 | struct pagevec lru_pvec; | |
1994 | struct cifsFileInfo *open_file; | |
ec637e3f | 1995 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1996 | |
1997 | xid = GetXid(); | |
1998 | if (file->private_data == NULL) { | |
0f3bc09e | 1999 | rc = -EBADF; |
1da177e4 | 2000 | FreeXid(xid); |
0f3bc09e | 2001 | return rc; |
1da177e4 LT |
2002 | } |
2003 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2004 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2005 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2006 | |
1da177e4 | 2007 | pagevec_init(&lru_pvec, 0); |
61de800d | 2008 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
2009 | for (i = 0; i < num_pages; ) { |
2010 | unsigned contig_pages; | |
2011 | struct page *tmp_page; | |
2012 | unsigned long expected_index; | |
2013 | ||
2014 | if (list_empty(page_list)) | |
2015 | break; | |
2016 | ||
2017 | page = list_entry(page_list->prev, struct page, lru); | |
2018 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2019 | ||
2020 | /* count adjacent pages that we will read into */ | |
2021 | contig_pages = 0; | |
fb8c4b14 | 2022 | expected_index = |
1da177e4 | 2023 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2024 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2025 | if (tmp_page->index == expected_index) { |
2026 | contig_pages++; | |
2027 | expected_index++; | |
2028 | } else | |
fb8c4b14 | 2029 | break; |
1da177e4 LT |
2030 | } |
2031 | if (contig_pages + i > num_pages) | |
2032 | contig_pages = num_pages - i; | |
2033 | ||
2034 | /* for reads over a certain size could initiate async | |
2035 | read ahead */ | |
2036 | ||
2037 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2038 | /* Read size needs to be in multiples of one page */ | |
2039 | read_size = min_t(const unsigned int, read_size, | |
2040 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2041 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2042 | read_size, contig_pages)); |
1da177e4 LT |
2043 | rc = -EAGAIN; |
2044 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2045 | if ((open_file->invalidHandle) && |
1da177e4 | 2046 | (!open_file->closePend)) { |
4b18f2a9 | 2047 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2048 | if (rc != 0) |
2049 | break; | |
2050 | } | |
2051 | ||
bfa0d75a | 2052 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2053 | open_file->netfid, |
2054 | read_size, offset, | |
2055 | &bytes_read, &smb_read_data, | |
2056 | &buf_type); | |
a9d02ad4 | 2057 | /* BB more RC checks ? */ |
fb8c4b14 | 2058 | if (rc == -EAGAIN) { |
1da177e4 | 2059 | if (smb_read_data) { |
fb8c4b14 | 2060 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2061 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2062 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2063 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2064 | smb_read_data = NULL; |
2065 | } | |
2066 | } | |
2067 | } | |
2068 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2069 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2070 | break; |
2071 | } else if (bytes_read > 0) { | |
6f88cc2e | 2072 | task_io_account_read(bytes_read); |
1da177e4 LT |
2073 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2074 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2075 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2076 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2077 | ||
2078 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2079 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2080 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2081 | i++; /* account for partial page */ |
2082 | ||
fb8c4b14 | 2083 | /* server copy of file can have smaller size |
1da177e4 | 2084 | than client */ |
fb8c4b14 SF |
2085 | /* BB do we need to verify this common case ? |
2086 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2087 | we will hit it on next read */ |
2088 | ||
05ac9d4b | 2089 | /* break; */ |
1da177e4 LT |
2090 | } |
2091 | } else { | |
2092 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2093 | "Cleaning remaining pages from readahead list", | |
2094 | bytes_read, offset)); | |
fb8c4b14 | 2095 | /* BB turn off caching and do new lookup on |
1da177e4 | 2096 | file size at server? */ |
1da177e4 LT |
2097 | break; |
2098 | } | |
2099 | if (smb_read_data) { | |
fb8c4b14 | 2100 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2101 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2102 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2103 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2104 | smb_read_data = NULL; |
2105 | } | |
2106 | bytes_read = 0; | |
2107 | } | |
2108 | ||
4f98a2fe | 2109 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2110 | |
2111 | /* need to free smb_read_data buf before exit */ | |
2112 | if (smb_read_data) { | |
fb8c4b14 | 2113 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2114 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2115 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2116 | cifs_buf_release(smb_read_data); |
1da177e4 | 2117 | smb_read_data = NULL; |
fb8c4b14 | 2118 | } |
1da177e4 LT |
2119 | |
2120 | FreeXid(xid); | |
2121 | return rc; | |
2122 | } | |
2123 | ||
2124 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2125 | loff_t *poffset) | |
2126 | { | |
2127 | char *read_data; | |
2128 | int rc; | |
2129 | ||
2130 | page_cache_get(page); | |
2131 | read_data = kmap(page); | |
2132 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2133 | |
1da177e4 | 2134 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2135 | |
1da177e4 LT |
2136 | if (rc < 0) |
2137 | goto io_error; | |
2138 | else | |
fb8c4b14 SF |
2139 | cFYI(1, ("Bytes read %d", rc)); |
2140 | ||
e6a00296 JJS |
2141 | file->f_path.dentry->d_inode->i_atime = |
2142 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2143 | |
1da177e4 LT |
2144 | if (PAGE_CACHE_SIZE > rc) |
2145 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2146 | ||
2147 | flush_dcache_page(page); | |
2148 | SetPageUptodate(page); | |
2149 | rc = 0; | |
fb8c4b14 | 2150 | |
1da177e4 | 2151 | io_error: |
fb8c4b14 | 2152 | kunmap(page); |
1da177e4 LT |
2153 | page_cache_release(page); |
2154 | return rc; | |
2155 | } | |
2156 | ||
2157 | static int cifs_readpage(struct file *file, struct page *page) | |
2158 | { | |
2159 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2160 | int rc = -EACCES; | |
2161 | int xid; | |
2162 | ||
2163 | xid = GetXid(); | |
2164 | ||
2165 | if (file->private_data == NULL) { | |
0f3bc09e | 2166 | rc = -EBADF; |
1da177e4 | 2167 | FreeXid(xid); |
0f3bc09e | 2168 | return rc; |
1da177e4 LT |
2169 | } |
2170 | ||
fb8c4b14 | 2171 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2172 | page, (int)offset, (int)offset)); |
2173 | ||
2174 | rc = cifs_readpage_worker(file, page, &offset); | |
2175 | ||
2176 | unlock_page(page); | |
2177 | ||
2178 | FreeXid(xid); | |
2179 | return rc; | |
2180 | } | |
2181 | ||
a403a0a3 SF |
2182 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2183 | { | |
2184 | struct cifsFileInfo *open_file; | |
2185 | ||
2186 | read_lock(&GlobalSMBSeslock); | |
2187 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2188 | if (open_file->closePend) | |
2189 | continue; | |
2190 | if (open_file->pfile && | |
2191 | ((open_file->pfile->f_flags & O_RDWR) || | |
2192 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2193 | read_unlock(&GlobalSMBSeslock); | |
2194 | return 1; | |
2195 | } | |
2196 | } | |
2197 | read_unlock(&GlobalSMBSeslock); | |
2198 | return 0; | |
2199 | } | |
2200 | ||
1da177e4 LT |
2201 | /* We do not want to update the file size from server for inodes |
2202 | open for write - to avoid races with writepage extending | |
2203 | the file - in the future we could consider allowing | |
fb8c4b14 | 2204 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2205 | but this is tricky to do without racing with writebehind |
2206 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2207 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2208 | { |
a403a0a3 | 2209 | if (!cifsInode) |
4b18f2a9 | 2210 | return true; |
50c2f753 | 2211 | |
a403a0a3 SF |
2212 | if (is_inode_writable(cifsInode)) { |
2213 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2214 | struct cifs_sb_info *cifs_sb; |
2215 | ||
c32a0b68 | 2216 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2217 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2218 | /* since no page cache to corrupt on directio |
c32a0b68 | 2219 | we can change size safely */ |
4b18f2a9 | 2220 | return true; |
c32a0b68 SF |
2221 | } |
2222 | ||
fb8c4b14 | 2223 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2224 | return true; |
7ba52631 | 2225 | |
4b18f2a9 | 2226 | return false; |
23e7dd7d | 2227 | } else |
4b18f2a9 | 2228 | return true; |
1da177e4 LT |
2229 | } |
2230 | ||
d9414774 NP |
2231 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2232 | loff_t pos, unsigned len, unsigned flags, | |
2233 | struct page **pagep, void **fsdata) | |
1da177e4 | 2234 | { |
d9414774 NP |
2235 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2236 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2237 | loff_t page_start = pos & PAGE_MASK; |
2238 | loff_t i_size; | |
2239 | struct page *page; | |
2240 | int rc = 0; | |
d9414774 NP |
2241 | |
2242 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2243 | ||
54566b2c | 2244 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2245 | if (!page) { |
2246 | rc = -ENOMEM; | |
2247 | goto out; | |
2248 | } | |
8a236264 | 2249 | |
a98ee8c1 JL |
2250 | if (PageUptodate(page)) |
2251 | goto out; | |
8a236264 | 2252 | |
a98ee8c1 JL |
2253 | /* |
2254 | * If we write a full page it will be up to date, no need to read from | |
2255 | * the server. If the write is short, we'll end up doing a sync write | |
2256 | * instead. | |
2257 | */ | |
2258 | if (len == PAGE_CACHE_SIZE) | |
2259 | goto out; | |
8a236264 | 2260 | |
a98ee8c1 JL |
2261 | /* |
2262 | * optimize away the read when we have an oplock, and we're not | |
2263 | * expecting to use any of the data we'd be reading in. That | |
2264 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2265 | * and the write will cover all of the existing data. | |
2266 | */ | |
2267 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2268 | i_size = i_size_read(mapping->host); | |
2269 | if (page_start >= i_size || | |
2270 | (offset == 0 && (pos + len) >= i_size)) { | |
2271 | zero_user_segments(page, 0, offset, | |
2272 | offset + len, | |
2273 | PAGE_CACHE_SIZE); | |
2274 | /* | |
2275 | * PageChecked means that the parts of the page | |
2276 | * to which we're not writing are considered up | |
2277 | * to date. Once the data is copied to the | |
2278 | * page, it can be set uptodate. | |
2279 | */ | |
2280 | SetPageChecked(page); | |
2281 | goto out; | |
2282 | } | |
2283 | } | |
d9414774 | 2284 | |
a98ee8c1 JL |
2285 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2286 | /* | |
2287 | * might as well read a page, it is fast enough. If we get | |
2288 | * an error, we don't need to return it. cifs_write_end will | |
2289 | * do a sync write instead since PG_uptodate isn't set. | |
2290 | */ | |
2291 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2292 | } else { |
2293 | /* we could try using another file handle if there is one - | |
2294 | but how would we lock it to prevent close of that handle | |
2295 | racing with this read? In any case | |
d9414774 | 2296 | this will be written out by write_end so is fine */ |
1da177e4 | 2297 | } |
a98ee8c1 JL |
2298 | out: |
2299 | *pagep = page; | |
2300 | return rc; | |
1da177e4 LT |
2301 | } |
2302 | ||
3bc303c2 JL |
2303 | static void |
2304 | cifs_oplock_break(struct slow_work *work) | |
2305 | { | |
2306 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2307 | oplock_break); | |
2308 | struct inode *inode = cfile->pInode; | |
2309 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2310 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2311 | int rc, waitrc = 0; | |
2312 | ||
2313 | if (inode && S_ISREG(inode->i_mode)) { | |
2314 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
2315 | if (cinode->clientCanCacheAll == 0) | |
8737c930 | 2316 | break_lease(inode, O_RDONLY); |
3bc303c2 | 2317 | else if (cinode->clientCanCacheRead == 0) |
8737c930 | 2318 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2319 | #endif |
2320 | rc = filemap_fdatawrite(inode->i_mapping); | |
2321 | if (cinode->clientCanCacheRead == 0) { | |
2322 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2323 | invalidate_remote_inode(inode); | |
2324 | } | |
2325 | if (!rc) | |
2326 | rc = waitrc; | |
2327 | if (rc) | |
2328 | cinode->write_behind_rc = rc; | |
2329 | cFYI(1, ("Oplock flush inode %p rc %d", inode, rc)); | |
2330 | } | |
2331 | ||
2332 | /* | |
2333 | * releasing stale oplock after recent reconnect of smb session using | |
2334 | * a now incorrect file handle is not a data integrity issue but do | |
2335 | * not bother sending an oplock release if session to server still is | |
2336 | * disconnected since oplock already released by the server | |
2337 | */ | |
2338 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2339 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2340 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
2341 | cFYI(1, ("Oplock release rc = %d", rc)); | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | static int | |
2346 | cifs_oplock_break_get(struct slow_work *work) | |
2347 | { | |
2348 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2349 | oplock_break); | |
2350 | mntget(cfile->mnt); | |
2351 | cifsFileInfo_get(cfile); | |
2352 | return 0; | |
2353 | } | |
2354 | ||
2355 | static void | |
2356 | cifs_oplock_break_put(struct slow_work *work) | |
2357 | { | |
2358 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2359 | oplock_break); | |
2360 | mntput(cfile->mnt); | |
2361 | cifsFileInfo_put(cfile); | |
2362 | } | |
2363 | ||
2364 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2365 | .get_ref = cifs_oplock_break_get, | |
2366 | .put_ref = cifs_oplock_break_put, | |
2367 | .execute = cifs_oplock_break, | |
2368 | }; | |
2369 | ||
f5e54d6e | 2370 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2371 | .readpage = cifs_readpage, |
2372 | .readpages = cifs_readpages, | |
2373 | .writepage = cifs_writepage, | |
37c0eb46 | 2374 | .writepages = cifs_writepages, |
d9414774 NP |
2375 | .write_begin = cifs_write_begin, |
2376 | .write_end = cifs_write_end, | |
1da177e4 LT |
2377 | .set_page_dirty = __set_page_dirty_nobuffers, |
2378 | /* .sync_page = cifs_sync_page, */ | |
2379 | /* .direct_IO = */ | |
2380 | }; | |
273d81d6 DK |
2381 | |
2382 | /* | |
2383 | * cifs_readpages requires the server to support a buffer large enough to | |
2384 | * contain the header plus one complete page of data. Otherwise, we need | |
2385 | * to leave cifs_readpages out of the address space operations. | |
2386 | */ | |
f5e54d6e | 2387 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2388 | .readpage = cifs_readpage, |
2389 | .writepage = cifs_writepage, | |
2390 | .writepages = cifs_writepages, | |
d9414774 NP |
2391 | .write_begin = cifs_write_begin, |
2392 | .write_end = cifs_write_end, | |
273d81d6 DK |
2393 | .set_page_dirty = __set_page_dirty_nobuffers, |
2394 | /* .sync_page = cifs_sync_page, */ | |
2395 | /* .direct_IO = */ | |
2396 | }; |