Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
43 | ||
1da177e4 LT |
44 | static inline int cifs_convert_flags(unsigned int flags) |
45 | { | |
46 | if ((flags & O_ACCMODE) == O_RDONLY) | |
47 | return GENERIC_READ; | |
48 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
49 | return GENERIC_WRITE; | |
50 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
51 | /* GENERIC_ALL is too much permission to request | |
52 | can cause unnecessary access denied on create */ | |
53 | /* return GENERIC_ALL; */ | |
54 | return (GENERIC_READ | GENERIC_WRITE); | |
55 | } | |
56 | ||
e10f7b55 JL |
57 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
58 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
59 | FILE_READ_DATA); | |
7fc8f4e9 | 60 | } |
e10f7b55 | 61 | |
7fc8f4e9 SF |
62 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
63 | { | |
64 | fmode_t posix_flags = 0; | |
e10f7b55 | 65 | |
7fc8f4e9 SF |
66 | if ((flags & O_ACCMODE) == O_RDONLY) |
67 | posix_flags = FMODE_READ; | |
68 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
69 | posix_flags = FMODE_WRITE; | |
70 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
71 | /* GENERIC_ALL is too much permission to request | |
72 | can cause unnecessary access denied on create */ | |
73 | /* return GENERIC_ALL; */ | |
74 | posix_flags = FMODE_READ | FMODE_WRITE; | |
75 | } | |
76 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
77 | reopening a file. They had their effect on the original open */ | |
78 | if (flags & O_APPEND) | |
79 | posix_flags |= (fmode_t)O_APPEND; | |
6b2f3d1f CH |
80 | if (flags & O_DSYNC) |
81 | posix_flags |= (fmode_t)O_DSYNC; | |
82 | if (flags & __O_SYNC) | |
83 | posix_flags |= (fmode_t)__O_SYNC; | |
7fc8f4e9 SF |
84 | if (flags & O_DIRECTORY) |
85 | posix_flags |= (fmode_t)O_DIRECTORY; | |
86 | if (flags & O_NOFOLLOW) | |
87 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
88 | if (flags & O_DIRECT) | |
89 | posix_flags |= (fmode_t)O_DIRECT; | |
90 | ||
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
276a74a4 | 108 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
109 | static inline int |
110 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
51c81764 | 111 | struct cifsInodeInfo *pCifsInode, __u32 oplock, |
590a3fe0 | 112 | u16 netfid) |
276a74a4 | 113 | { |
276a74a4 | 114 | |
276a74a4 | 115 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
116 | |
117 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
118 | if (pCifsInode == NULL) { | |
119 | write_unlock(&GlobalSMBSeslock); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
276a74a4 SF |
123 | if (pCifsInode->clientCanCacheRead) { |
124 | /* we have the inode open somewhere else | |
125 | no need to discard cache data */ | |
126 | goto psx_client_can_cache; | |
127 | } | |
128 | ||
129 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
130 | BB fIX following section BB FIXME */ | |
131 | ||
132 | /* if not oplocked, invalidate inode pages if mtime or file | |
133 | size changed */ | |
134 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
135 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
136 | (file->f_path.dentry->d_inode->i_size == | |
137 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
b6b38f70 | 138 | cFYI(1, "inode unchanged on server"); |
276a74a4 SF |
139 | } else { |
140 | if (file->f_path.dentry->d_inode->i_mapping) { | |
141 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
142 | if (rc != 0) | |
143 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
144 | } | |
b6b38f70 JP |
145 | cFYI(1, "invalidating remote inode since open detected it " |
146 | "changed"); | |
276a74a4 SF |
147 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
148 | } */ | |
149 | ||
150 | psx_client_can_cache: | |
151 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
152 | pCifsInode->clientCanCacheAll = true; | |
153 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
154 | cFYI(1, "Exclusive Oplock granted on inode %p", |
155 | file->f_path.dentry->d_inode); | |
276a74a4 SF |
156 | } else if ((oplock & 0xF) == OPLOCK_READ) |
157 | pCifsInode->clientCanCacheRead = true; | |
158 | ||
159 | /* will have to change the unlock if we reenable the | |
160 | filemap_fdatawrite (which does not seem necessary */ | |
161 | write_unlock(&GlobalSMBSeslock); | |
162 | return 0; | |
163 | } | |
164 | ||
703a3b8e SF |
165 | static struct cifsFileInfo * |
166 | cifs_fill_filedata(struct file *file) | |
167 | { | |
168 | struct list_head *tmp; | |
169 | struct cifsFileInfo *pCifsFile = NULL; | |
170 | struct cifsInodeInfo *pCifsInode = NULL; | |
171 | ||
172 | /* search inode for this file and fill in file->private_data */ | |
173 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
174 | read_lock(&GlobalSMBSeslock); | |
175 | list_for_each(tmp, &pCifsInode->openFileList) { | |
176 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
177 | if ((pCifsFile->pfile == NULL) && | |
178 | (pCifsFile->pid == current->tgid)) { | |
179 | /* mode set in cifs_create */ | |
180 | ||
181 | /* needed for writepage */ | |
182 | pCifsFile->pfile = file; | |
183 | file->private_data = pCifsFile; | |
184 | break; | |
185 | } | |
186 | } | |
187 | read_unlock(&GlobalSMBSeslock); | |
188 | ||
189 | if (file->private_data != NULL) { | |
190 | return pCifsFile; | |
191 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
b6b38f70 JP |
192 | cERROR(1, "could not find file instance for " |
193 | "new file %p", file); | |
703a3b8e SF |
194 | return NULL; |
195 | } | |
196 | ||
1da177e4 LT |
197 | /* all arguments to this function must be checked for validity in caller */ |
198 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
199 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
200 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
201 | char *full_path, int xid) | |
202 | { | |
203 | struct timespec temp; | |
204 | int rc; | |
205 | ||
1da177e4 LT |
206 | if (pCifsInode->clientCanCacheRead) { |
207 | /* we have the inode open somewhere else | |
208 | no need to discard cache data */ | |
209 | goto client_can_cache; | |
210 | } | |
211 | ||
212 | /* BB need same check in cifs_create too? */ | |
213 | /* if not oplocked, invalidate inode pages if mtime or file | |
214 | size changed */ | |
07119a4d | 215 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
216 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
217 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 | 218 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 219 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 220 | } else { |
e6a00296 | 221 | if (file->f_path.dentry->d_inode->i_mapping) { |
ff215713 SF |
222 | /* BB no need to lock inode until after invalidate |
223 | since namei code should already have it locked? */ | |
cea21805 JL |
224 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
225 | if (rc != 0) | |
226 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 | 227 | } |
b6b38f70 JP |
228 | cFYI(1, "invalidating remote inode since open detected it " |
229 | "changed"); | |
e6a00296 | 230 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
231 | } |
232 | ||
233 | client_can_cache: | |
c18c842b | 234 | if (pTcon->unix_ext) |
e6a00296 | 235 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
236 | full_path, inode->i_sb, xid); |
237 | else | |
e6a00296 | 238 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 239 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
240 | |
241 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
242 | pCifsInode->clientCanCacheAll = true; |
243 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
244 | cFYI(1, "Exclusive Oplock granted on inode %p", |
245 | file->f_path.dentry->d_inode); | |
1da177e4 | 246 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 247 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
248 | |
249 | return rc; | |
250 | } | |
251 | ||
252 | int cifs_open(struct inode *inode, struct file *file) | |
253 | { | |
254 | int rc = -EACCES; | |
590a3fe0 JL |
255 | int xid; |
256 | __u32 oplock; | |
1da177e4 | 257 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 258 | struct cifsTconInfo *tcon; |
1da177e4 LT |
259 | struct cifsFileInfo *pCifsFile; |
260 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
261 | char *full_path = NULL; |
262 | int desiredAccess; | |
263 | int disposition; | |
264 | __u16 netfid; | |
265 | FILE_ALL_INFO *buf = NULL; | |
266 | ||
267 | xid = GetXid(); | |
268 | ||
269 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 270 | tcon = cifs_sb->tcon; |
1da177e4 | 271 | |
a6ce4932 | 272 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
273 | pCifsFile = cifs_fill_filedata(file); |
274 | if (pCifsFile) { | |
0f3bc09e | 275 | rc = 0; |
a6ce4932 | 276 | FreeXid(xid); |
0f3bc09e | 277 | return rc; |
703a3b8e | 278 | } |
1da177e4 | 279 | |
e6a00296 | 280 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 281 | if (full_path == NULL) { |
0f3bc09e | 282 | rc = -ENOMEM; |
1da177e4 | 283 | FreeXid(xid); |
0f3bc09e | 284 | return rc; |
1da177e4 LT |
285 | } |
286 | ||
b6b38f70 JP |
287 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
288 | inode, file->f_flags, full_path); | |
276a74a4 SF |
289 | |
290 | if (oplockEnabled) | |
291 | oplock = REQ_OPLOCK; | |
292 | else | |
293 | oplock = 0; | |
294 | ||
64cc2c63 SF |
295 | if (!tcon->broken_posix_open && tcon->unix_ext && |
296 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
297 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
298 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
299 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
fa588e0c | 300 | oflags |= SMB_O_CREAT; |
276a74a4 | 301 | /* can not refresh inode info since size could be stale */ |
3bc303c2 | 302 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
fa588e0c SF |
303 | inode->i_sb, |
304 | cifs_sb->mnt_file_mode /* ignored */, | |
305 | oflags, &oplock, &netfid, xid); | |
276a74a4 | 306 | if (rc == 0) { |
b6b38f70 | 307 | cFYI(1, "posix open succeeded"); |
276a74a4 SF |
308 | /* no need for special case handling of setting mode |
309 | on read only files needed here */ | |
310 | ||
703a3b8e | 311 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 | 312 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
51c81764 | 313 | oplock, netfid); |
276a74a4 | 314 | goto out; |
64cc2c63 SF |
315 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
316 | if (tcon->ses->serverNOS) | |
b6b38f70 | 317 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
318 | " unexpected error on SMB posix open" |
319 | ", disabling posix open support." | |
320 | " Check if server update available.", | |
321 | tcon->ses->serverName, | |
b6b38f70 | 322 | tcon->ses->serverNOS); |
64cc2c63 | 323 | tcon->broken_posix_open = true; |
276a74a4 SF |
324 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
325 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
326 | goto out; | |
64cc2c63 SF |
327 | /* else fallthrough to retry open the old way on network i/o |
328 | or DFS errors */ | |
276a74a4 SF |
329 | } |
330 | ||
1da177e4 LT |
331 | desiredAccess = cifs_convert_flags(file->f_flags); |
332 | ||
333 | /********************************************************************* | |
334 | * open flag mapping table: | |
fb8c4b14 | 335 | * |
1da177e4 | 336 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 337 | * ---------- ---------------- |
1da177e4 LT |
338 | * O_CREAT FILE_OPEN_IF |
339 | * O_CREAT | O_EXCL FILE_CREATE | |
340 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
341 | * O_TRUNC FILE_OVERWRITE | |
342 | * none of the above FILE_OPEN | |
343 | * | |
344 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 345 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
346 | * O_CREAT | O_TRUNC is similar but truncates the existing |
347 | * file rather than creating a new file as FILE_SUPERSEDE does | |
348 | * (which uses the attributes / metadata passed in on open call) | |
349 | *? | |
fb8c4b14 | 350 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
351 | *? and the read write flags match reasonably. O_LARGEFILE |
352 | *? is irrelevant because largefile support is always used | |
353 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
354 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
355 | *********************************************************************/ | |
356 | ||
357 | disposition = cifs_get_disposition(file->f_flags); | |
358 | ||
1da177e4 LT |
359 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
360 | ||
361 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
362 | and calling get_inode_info with returned buf (at least helps | |
363 | non-Unix server case) */ | |
364 | ||
fb8c4b14 SF |
365 | /* BB we can not do this if this is the second open of a file |
366 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
367 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
368 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
369 | if (!buf) { | |
370 | rc = -ENOMEM; | |
371 | goto out; | |
372 | } | |
5bafd765 SF |
373 | |
374 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 375 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 376 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
377 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
378 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
379 | else |
380 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
381 | ||
a9d02ad4 SF |
382 | if (rc == -EIO) { |
383 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 384 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
385 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
386 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
387 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
388 | } | |
1da177e4 | 389 | if (rc) { |
b6b38f70 | 390 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
391 | goto out; |
392 | } | |
3321b791 | 393 | |
086f68bd JL |
394 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
395 | file->f_flags); | |
396 | file->private_data = pCifsFile; | |
1da177e4 LT |
397 | if (file->private_data == NULL) { |
398 | rc = -ENOMEM; | |
399 | goto out; | |
400 | } | |
1da177e4 | 401 | |
3321b791 JL |
402 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
403 | &oplock, buf, full_path, xid); | |
1da177e4 | 404 | |
fb8c4b14 | 405 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
406 | /* time to set mode which we can not set earlier due to |
407 | problems creating new read-only files */ | |
276a74a4 | 408 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
409 | struct cifs_unix_set_info_args args = { |
410 | .mode = inode->i_mode, | |
411 | .uid = NO_CHANGE_64, | |
412 | .gid = NO_CHANGE_64, | |
413 | .ctime = NO_CHANGE_64, | |
414 | .atime = NO_CHANGE_64, | |
415 | .mtime = NO_CHANGE_64, | |
416 | .device = 0, | |
417 | }; | |
01ea95e3 JL |
418 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
419 | cifs_sb->local_nls, | |
420 | cifs_sb->mnt_cifs_flags & | |
737b758c | 421 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
422 | } |
423 | } | |
424 | ||
425 | out: | |
426 | kfree(buf); | |
427 | kfree(full_path); | |
428 | FreeXid(xid); | |
429 | return rc; | |
430 | } | |
431 | ||
0418726b | 432 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
433 | /* to server was lost */ |
434 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
435 | { | |
436 | int rc = 0; | |
437 | ||
438 | /* BB list all locks open on this file and relock */ | |
439 | ||
440 | return rc; | |
441 | } | |
442 | ||
4b18f2a9 | 443 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
444 | { |
445 | int rc = -EACCES; | |
590a3fe0 JL |
446 | int xid; |
447 | __u32 oplock; | |
1da177e4 | 448 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 449 | struct cifsTconInfo *tcon; |
1da177e4 LT |
450 | struct cifsFileInfo *pCifsFile; |
451 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 452 | struct inode *inode; |
1da177e4 LT |
453 | char *full_path = NULL; |
454 | int desiredAccess; | |
455 | int disposition = FILE_OPEN; | |
456 | __u16 netfid; | |
457 | ||
ad7a2926 | 458 | if (file->private_data) |
1da177e4 | 459 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 460 | else |
1da177e4 LT |
461 | return -EBADF; |
462 | ||
463 | xid = GetXid(); | |
f0a71eb8 | 464 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 465 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 466 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 467 | rc = 0; |
1da177e4 | 468 | FreeXid(xid); |
0f3bc09e | 469 | return rc; |
1da177e4 LT |
470 | } |
471 | ||
e6a00296 | 472 | if (file->f_path.dentry == NULL) { |
b6b38f70 | 473 | cERROR(1, "no valid name if dentry freed"); |
3a9f462f SF |
474 | dump_stack(); |
475 | rc = -EBADF; | |
476 | goto reopen_error_exit; | |
477 | } | |
478 | ||
479 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 480 | if (inode == NULL) { |
b6b38f70 | 481 | cERROR(1, "inode not valid"); |
3a9f462f SF |
482 | dump_stack(); |
483 | rc = -EBADF; | |
484 | goto reopen_error_exit; | |
1da177e4 | 485 | } |
50c2f753 | 486 | |
1da177e4 | 487 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 488 | tcon = cifs_sb->tcon; |
3a9f462f | 489 | |
1da177e4 LT |
490 | /* can not grab rename sem here because various ops, including |
491 | those that already have the rename sem can end up causing writepage | |
492 | to get called and if the server was down that means we end up here, | |
493 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 494 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 495 | if (full_path == NULL) { |
3a9f462f SF |
496 | rc = -ENOMEM; |
497 | reopen_error_exit: | |
f0a71eb8 | 498 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 499 | FreeXid(xid); |
3a9f462f | 500 | return rc; |
1da177e4 LT |
501 | } |
502 | ||
b6b38f70 JP |
503 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
504 | inode, file->f_flags, full_path); | |
1da177e4 LT |
505 | |
506 | if (oplockEnabled) | |
507 | oplock = REQ_OPLOCK; | |
508 | else | |
4b18f2a9 | 509 | oplock = 0; |
1da177e4 | 510 | |
7fc8f4e9 SF |
511 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
512 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
513 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
514 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
515 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 516 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
fa588e0c SF |
517 | inode->i_sb, |
518 | cifs_sb->mnt_file_mode /* ignored */, | |
519 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 520 | if (rc == 0) { |
b6b38f70 | 521 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
522 | goto reopen_success; |
523 | } | |
524 | /* fallthrough to retry open the old way on errors, especially | |
525 | in the reconnect path it is important to retry hard */ | |
526 | } | |
527 | ||
528 | desiredAccess = cifs_convert_flags(file->f_flags); | |
529 | ||
1da177e4 | 530 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
531 | by SMBOpen and then calling get_inode_info with returned buf |
532 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
533 | and server version of file size can be stale. If we knew for sure |
534 | that inode was not dirty locally we could do this */ | |
535 | ||
7fc8f4e9 | 536 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 537 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 538 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 539 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 540 | if (rc) { |
f0a71eb8 | 541 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
542 | cFYI(1, "cifs_open returned 0x%x", rc); |
543 | cFYI(1, "oplock: %d", oplock); | |
1da177e4 | 544 | } else { |
7fc8f4e9 | 545 | reopen_success: |
1da177e4 | 546 | pCifsFile->netfid = netfid; |
4b18f2a9 | 547 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 548 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
549 | pCifsInode = CIFS_I(inode); |
550 | if (pCifsInode) { | |
551 | if (can_flush) { | |
cea21805 JL |
552 | rc = filemap_write_and_wait(inode->i_mapping); |
553 | if (rc != 0) | |
554 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
555 | /* temporarily disable caching while we |
556 | go to server to get inode info */ | |
4b18f2a9 SF |
557 | pCifsInode->clientCanCacheAll = false; |
558 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 559 | if (tcon->unix_ext) |
1da177e4 LT |
560 | rc = cifs_get_inode_info_unix(&inode, |
561 | full_path, inode->i_sb, xid); | |
562 | else | |
563 | rc = cifs_get_inode_info(&inode, | |
564 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 565 | xid, NULL); |
1da177e4 LT |
566 | } /* else we are writing out data to server already |
567 | and could deadlock if we tried to flush data, and | |
568 | since we do not know if we have data that would | |
569 | invalidate the current end of file on the server | |
570 | we can not go to the server to get the new inod | |
571 | info */ | |
572 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
573 | pCifsInode->clientCanCacheAll = true; |
574 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
575 | cFYI(1, "Exclusive Oplock granted on inode %p", |
576 | file->f_path.dentry->d_inode); | |
1da177e4 | 577 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
578 | pCifsInode->clientCanCacheRead = true; |
579 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 580 | } else { |
4b18f2a9 SF |
581 | pCifsInode->clientCanCacheRead = false; |
582 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
583 | } |
584 | cifs_relock_file(pCifsFile); | |
585 | } | |
586 | } | |
1da177e4 LT |
587 | kfree(full_path); |
588 | FreeXid(xid); | |
589 | return rc; | |
590 | } | |
591 | ||
592 | int cifs_close(struct inode *inode, struct file *file) | |
593 | { | |
594 | int rc = 0; | |
15745320 | 595 | int xid, timeout; |
1da177e4 LT |
596 | struct cifs_sb_info *cifs_sb; |
597 | struct cifsTconInfo *pTcon; | |
598 | struct cifsFileInfo *pSMBFile = | |
599 | (struct cifsFileInfo *)file->private_data; | |
600 | ||
601 | xid = GetXid(); | |
602 | ||
603 | cifs_sb = CIFS_SB(inode->i_sb); | |
604 | pTcon = cifs_sb->tcon; | |
605 | if (pSMBFile) { | |
7ee1af76 | 606 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 607 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 608 | pSMBFile->closePend = true; |
1da177e4 LT |
609 | if (pTcon) { |
610 | /* no sense reconnecting to close a file that is | |
611 | already closed */ | |
3b795210 | 612 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 613 | write_unlock(&GlobalSMBSeslock); |
15745320 | 614 | timeout = 2; |
6ab409b5 | 615 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 616 | && (timeout <= 2048)) { |
23e7dd7d SF |
617 | /* Give write a better chance to get to |
618 | server ahead of the close. We do not | |
619 | want to add a wait_q here as it would | |
620 | increase the memory utilization as | |
621 | the struct would be in each open file, | |
fb8c4b14 | 622 | but this should give enough time to |
23e7dd7d | 623 | clear the socket */ |
b6b38f70 | 624 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
625 | msleep(timeout); |
626 | timeout *= 4; | |
4891d539 | 627 | } |
ddb4cbfc SF |
628 | if (!pTcon->need_reconnect && |
629 | !pSMBFile->invalidHandle) | |
630 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 631 | pSMBFile->netfid); |
ddb4cbfc SF |
632 | } else |
633 | write_unlock(&GlobalSMBSeslock); | |
634 | } else | |
635 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
636 | |
637 | /* Delete any outstanding lock records. | |
638 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 639 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
640 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
641 | list_del(&li->llist); | |
642 | kfree(li); | |
643 | } | |
796e5661 | 644 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 645 | |
cbe0476f | 646 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
647 | list_del(&pSMBFile->flist); |
648 | list_del(&pSMBFile->tlist); | |
cbe0476f | 649 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 650 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
651 | file->private_data = NULL; |
652 | } else | |
653 | rc = -EBADF; | |
654 | ||
4efa53f0 | 655 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 656 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 657 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
658 | /* if the file is not open we do not know if we can cache info |
659 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
660 | CIFS_I(inode)->clientCanCacheRead = false; |
661 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 662 | } |
4efa53f0 | 663 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 664 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
665 | rc = CIFS_I(inode)->write_behind_rc; |
666 | FreeXid(xid); | |
667 | return rc; | |
668 | } | |
669 | ||
670 | int cifs_closedir(struct inode *inode, struct file *file) | |
671 | { | |
672 | int rc = 0; | |
673 | int xid; | |
674 | struct cifsFileInfo *pCFileStruct = | |
675 | (struct cifsFileInfo *)file->private_data; | |
676 | char *ptmp; | |
677 | ||
b6b38f70 | 678 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
679 | |
680 | xid = GetXid(); | |
681 | ||
682 | if (pCFileStruct) { | |
683 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
684 | struct cifs_sb_info *cifs_sb = |
685 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
686 | |
687 | pTcon = cifs_sb->tcon; | |
688 | ||
b6b38f70 | 689 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 690 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
691 | if (!pCFileStruct->srch_inf.endOfSearch && |
692 | !pCFileStruct->invalidHandle) { | |
693 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 694 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 695 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
696 | cFYI(1, "Closing uncompleted readdir with rc %d", |
697 | rc); | |
1da177e4 LT |
698 | /* not much we can do if it fails anyway, ignore rc */ |
699 | rc = 0; | |
ddb4cbfc SF |
700 | } else |
701 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
702 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
703 | if (ptmp) { | |
b6b38f70 | 704 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 705 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 706 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
707 | cifs_small_buf_release(ptmp); |
708 | else | |
709 | cifs_buf_release(ptmp); | |
1da177e4 | 710 | } |
1da177e4 LT |
711 | kfree(file->private_data); |
712 | file->private_data = NULL; | |
713 | } | |
714 | /* BB can we lock the filestruct while this is going on? */ | |
715 | FreeXid(xid); | |
716 | return rc; | |
717 | } | |
718 | ||
7ee1af76 JA |
719 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
720 | __u64 offset, __u8 lockType) | |
721 | { | |
fb8c4b14 SF |
722 | struct cifsLockInfo *li = |
723 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
724 | if (li == NULL) |
725 | return -ENOMEM; | |
726 | li->offset = offset; | |
727 | li->length = len; | |
728 | li->type = lockType; | |
796e5661 | 729 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 730 | list_add(&li->llist, &fid->llist); |
796e5661 | 731 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
732 | return 0; |
733 | } | |
734 | ||
1da177e4 LT |
735 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
736 | { | |
737 | int rc, xid; | |
1da177e4 LT |
738 | __u32 numLock = 0; |
739 | __u32 numUnlock = 0; | |
740 | __u64 length; | |
4b18f2a9 | 741 | bool wait_flag = false; |
1da177e4 | 742 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 743 | struct cifsTconInfo *tcon; |
08547b03 SF |
744 | __u16 netfid; |
745 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 746 | bool posix_locking = 0; |
1da177e4 LT |
747 | |
748 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
749 | rc = -EACCES; | |
750 | xid = GetXid(); | |
751 | ||
b6b38f70 | 752 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 753 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 754 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 755 | pfLock->fl_end); |
1da177e4 LT |
756 | |
757 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 758 | cFYI(1, "Posix"); |
1da177e4 | 759 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 760 | cFYI(1, "Flock"); |
1da177e4 | 761 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 762 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 763 | wait_flag = true; |
1da177e4 LT |
764 | } |
765 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
766 | cFYI(1, "Process suspended by mandatory locking - " |
767 | "not implemented yet"); | |
1da177e4 | 768 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 769 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 770 | if (pfLock->fl_flags & |
1da177e4 | 771 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 772 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
773 | |
774 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 775 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
776 | numLock = 1; |
777 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 778 | cFYI(1, "F_UNLCK"); |
1da177e4 | 779 | numUnlock = 1; |
d47d7c1a SF |
780 | /* Check if unlock includes more than |
781 | one lock range */ | |
1da177e4 | 782 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 783 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
784 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
785 | numLock = 1; | |
786 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 787 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
788 | numLock = 1; |
789 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 790 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
791 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
792 | numLock = 1; | |
793 | } else | |
b6b38f70 | 794 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 795 | |
e6a00296 | 796 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 797 | tcon = cifs_sb->tcon; |
1da177e4 LT |
798 | |
799 | if (file->private_data == NULL) { | |
0f3bc09e | 800 | rc = -EBADF; |
1da177e4 | 801 | FreeXid(xid); |
0f3bc09e | 802 | return rc; |
1da177e4 | 803 | } |
08547b03 SF |
804 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
805 | ||
13a6e42a SF |
806 | if ((tcon->ses->capabilities & CAP_UNIX) && |
807 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 808 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 809 | posix_locking = 1; |
08547b03 SF |
810 | /* BB add code here to normalize offset and length to |
811 | account for negative length which we can not accept over the | |
812 | wire */ | |
1da177e4 | 813 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 814 | if (posix_locking) { |
08547b03 | 815 | int posix_lock_type; |
fb8c4b14 | 816 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
817 | posix_lock_type = CIFS_RDLCK; |
818 | else | |
819 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 820 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 821 | length, pfLock, |
08547b03 SF |
822 | posix_lock_type, wait_flag); |
823 | FreeXid(xid); | |
824 | return rc; | |
825 | } | |
826 | ||
827 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 828 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 829 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 830 | if (rc == 0) { |
13a6e42a | 831 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
832 | pfLock->fl_start, 1 /* numUnlock */ , |
833 | 0 /* numLock */ , lockType, | |
834 | 0 /* wait flag */ ); | |
835 | pfLock->fl_type = F_UNLCK; | |
836 | if (rc != 0) | |
b6b38f70 JP |
837 | cERROR(1, "Error unlocking previously locked " |
838 | "range %d during test of lock", rc); | |
1da177e4 LT |
839 | rc = 0; |
840 | ||
841 | } else { | |
842 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
843 | rc = 0; |
844 | ||
845 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
846 | pfLock->fl_type = F_WRLCK; | |
847 | } else { | |
848 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
849 | pfLock->fl_start, 0, 1, | |
850 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
851 | 0 /* wait flag */); | |
852 | if (rc == 0) { | |
853 | rc = CIFSSMBLock(xid, tcon, netfid, | |
854 | length, pfLock->fl_start, 1, 0, | |
855 | lockType | | |
856 | LOCKING_ANDX_SHARED_LOCK, | |
857 | 0 /* wait flag */); | |
858 | pfLock->fl_type = F_RDLCK; | |
859 | if (rc != 0) | |
f19159dc | 860 | cERROR(1, "Error unlocking " |
f05337c6 | 861 | "previously locked range %d " |
f19159dc | 862 | "during test of lock", rc); |
f05337c6 PS |
863 | rc = 0; |
864 | } else { | |
865 | pfLock->fl_type = F_WRLCK; | |
866 | rc = 0; | |
867 | } | |
868 | } | |
1da177e4 LT |
869 | } |
870 | ||
871 | FreeXid(xid); | |
872 | return rc; | |
873 | } | |
7ee1af76 JA |
874 | |
875 | if (!numLock && !numUnlock) { | |
876 | /* if no lock or unlock then nothing | |
877 | to do since we do not know what it is */ | |
878 | FreeXid(xid); | |
879 | return -EOPNOTSUPP; | |
880 | } | |
881 | ||
882 | if (posix_locking) { | |
08547b03 | 883 | int posix_lock_type; |
fb8c4b14 | 884 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
885 | posix_lock_type = CIFS_RDLCK; |
886 | else | |
887 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 888 | |
fb8c4b14 | 889 | if (numUnlock == 1) |
beb84dc8 | 890 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 891 | |
13a6e42a | 892 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 893 | length, pfLock, |
08547b03 | 894 | posix_lock_type, wait_flag); |
7ee1af76 | 895 | } else { |
fb8c4b14 SF |
896 | struct cifsFileInfo *fid = |
897 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
898 | |
899 | if (numLock) { | |
13a6e42a | 900 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 901 | pfLock->fl_start, |
7ee1af76 JA |
902 | 0, numLock, lockType, wait_flag); |
903 | ||
904 | if (rc == 0) { | |
905 | /* For Windows locks we must store them. */ | |
906 | rc = store_file_lock(fid, length, | |
907 | pfLock->fl_start, lockType); | |
908 | } | |
909 | } else if (numUnlock) { | |
910 | /* For each stored lock that this unlock overlaps | |
911 | completely, unlock it. */ | |
912 | int stored_rc = 0; | |
913 | struct cifsLockInfo *li, *tmp; | |
914 | ||
6b70c955 | 915 | rc = 0; |
796e5661 | 916 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
917 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
918 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 919 | (pfLock->fl_start + length) >= |
39db810c | 920 | (li->offset + li->length)) { |
13a6e42a | 921 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 922 | netfid, |
7ee1af76 | 923 | li->length, li->offset, |
4b18f2a9 | 924 | 1, 0, li->type, false); |
7ee1af76 JA |
925 | if (stored_rc) |
926 | rc = stored_rc; | |
2c964d1f PS |
927 | else { |
928 | list_del(&li->llist); | |
929 | kfree(li); | |
930 | } | |
7ee1af76 JA |
931 | } |
932 | } | |
796e5661 | 933 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
934 | } |
935 | } | |
936 | ||
d634cc15 | 937 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
938 | posix_lock_file_wait(file, pfLock); |
939 | FreeXid(xid); | |
940 | return rc; | |
941 | } | |
942 | ||
fbec9ab9 JL |
943 | /* |
944 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
945 | * these calls can be very long. | |
946 | * | |
947 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
948 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
949 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
950 | * welcome if someone wants to suggest one. | |
951 | * | |
952 | * We may be able to do a better job with this if there were some way to | |
953 | * declare that a file should be sparse. | |
954 | */ | |
955 | static int | |
956 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
957 | { | |
958 | if (offset <= cifsi->server_eof) | |
959 | return CIFS_STD_OP; | |
960 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
961 | return CIFS_VLONG_OP; | |
962 | else | |
963 | return CIFS_LONG_OP; | |
964 | } | |
965 | ||
966 | /* update the file size (if needed) after a write */ | |
967 | static void | |
968 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
969 | unsigned int bytes_written) | |
970 | { | |
971 | loff_t end_of_write = offset + bytes_written; | |
972 | ||
973 | if (end_of_write > cifsi->server_eof) | |
974 | cifsi->server_eof = end_of_write; | |
975 | } | |
976 | ||
1da177e4 LT |
977 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
978 | size_t write_size, loff_t *poffset) | |
979 | { | |
980 | int rc = 0; | |
981 | unsigned int bytes_written = 0; | |
982 | unsigned int total_written; | |
983 | struct cifs_sb_info *cifs_sb; | |
984 | struct cifsTconInfo *pTcon; | |
985 | int xid, long_op; | |
986 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 987 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 988 | |
e6a00296 | 989 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
990 | |
991 | pTcon = cifs_sb->tcon; | |
992 | ||
b6b38f70 JP |
993 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
994 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
995 | |
996 | if (file->private_data == NULL) | |
997 | return -EBADF; | |
c33f8d32 | 998 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 999 | |
838726c4 JL |
1000 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1001 | if (rc) | |
1002 | return rc; | |
1003 | ||
1da177e4 | 1004 | xid = GetXid(); |
1da177e4 | 1005 | |
fbec9ab9 | 1006 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1007 | for (total_written = 0; write_size > total_written; |
1008 | total_written += bytes_written) { | |
1009 | rc = -EAGAIN; | |
1010 | while (rc == -EAGAIN) { | |
1011 | if (file->private_data == NULL) { | |
1012 | /* file has been closed on us */ | |
1013 | FreeXid(xid); | |
1014 | /* if we have gotten here we have written some data | |
1015 | and blocked, and the file has been freed on us while | |
1016 | we blocked so return what we managed to write */ | |
1017 | return total_written; | |
fb8c4b14 | 1018 | } |
1da177e4 LT |
1019 | if (open_file->closePend) { |
1020 | FreeXid(xid); | |
1021 | if (total_written) | |
1022 | return total_written; | |
1023 | else | |
1024 | return -EBADF; | |
1025 | } | |
1026 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1027 | /* we could deadlock if we called |
1028 | filemap_fdatawait from here so tell | |
1029 | reopen_file not to flush data to server | |
1030 | now */ | |
4b18f2a9 | 1031 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1032 | if (rc != 0) |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | rc = CIFSSMBWrite(xid, pTcon, | |
1037 | open_file->netfid, | |
1038 | min_t(const int, cifs_sb->wsize, | |
1039 | write_size - total_written), | |
1040 | *poffset, &bytes_written, | |
1041 | NULL, write_data + total_written, long_op); | |
1042 | } | |
1043 | if (rc || (bytes_written == 0)) { | |
1044 | if (total_written) | |
1045 | break; | |
1046 | else { | |
1047 | FreeXid(xid); | |
1048 | return rc; | |
1049 | } | |
fbec9ab9 JL |
1050 | } else { |
1051 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1052 | *poffset += bytes_written; |
fbec9ab9 | 1053 | } |
133672ef | 1054 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1055 | 15 seconds is plenty */ |
1056 | } | |
1057 | ||
a4544347 | 1058 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1059 | |
1060 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1061 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1062 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1063 | /* Do not update local mtime - server will set its actual value on write |
1064 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1065 | * current_fs_time(inode->i_sb);*/ |
1066 | if (total_written > 0) { | |
1067 | spin_lock(&inode->i_lock); | |
1068 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1069 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1070 | *poffset); |
3677db10 | 1071 | spin_unlock(&inode->i_lock); |
1da177e4 | 1072 | } |
fb8c4b14 | 1073 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1074 | } |
1075 | FreeXid(xid); | |
1076 | return total_written; | |
1077 | } | |
1078 | ||
1079 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1080 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1081 | { |
1082 | int rc = 0; | |
1083 | unsigned int bytes_written = 0; | |
1084 | unsigned int total_written; | |
1085 | struct cifs_sb_info *cifs_sb; | |
1086 | struct cifsTconInfo *pTcon; | |
1087 | int xid, long_op; | |
1088 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1089 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1090 | |
e6a00296 | 1091 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1092 | |
1093 | pTcon = cifs_sb->tcon; | |
1094 | ||
b6b38f70 JP |
1095 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1096 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1097 | |
1098 | if (file->private_data == NULL) | |
1099 | return -EBADF; | |
c33f8d32 | 1100 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1101 | |
1da177e4 | 1102 | xid = GetXid(); |
1da177e4 | 1103 | |
fbec9ab9 | 1104 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1105 | for (total_written = 0; write_size > total_written; |
1106 | total_written += bytes_written) { | |
1107 | rc = -EAGAIN; | |
1108 | while (rc == -EAGAIN) { | |
1109 | if (file->private_data == NULL) { | |
1110 | /* file has been closed on us */ | |
1111 | FreeXid(xid); | |
1112 | /* if we have gotten here we have written some data | |
1113 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1114 | while we blocked so return what we managed to |
1da177e4 LT |
1115 | write */ |
1116 | return total_written; | |
fb8c4b14 | 1117 | } |
1da177e4 LT |
1118 | if (open_file->closePend) { |
1119 | FreeXid(xid); | |
1120 | if (total_written) | |
1121 | return total_written; | |
1122 | else | |
1123 | return -EBADF; | |
1124 | } | |
1125 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1126 | /* we could deadlock if we called |
1127 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1128 | reopen_file not to flush data to |
1da177e4 | 1129 | server now */ |
4b18f2a9 | 1130 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1131 | if (rc != 0) |
1132 | break; | |
1133 | } | |
fb8c4b14 SF |
1134 | if (experimEnabled || (pTcon->ses->server && |
1135 | ((pTcon->ses->server->secMode & | |
08775834 | 1136 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1137 | == 0))) { |
3e84469d SF |
1138 | struct kvec iov[2]; |
1139 | unsigned int len; | |
1140 | ||
0ae0efad | 1141 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1142 | write_size - total_written); |
1143 | /* iov[0] is reserved for smb header */ | |
1144 | iov[1].iov_base = (char *)write_data + | |
1145 | total_written; | |
1146 | iov[1].iov_len = len; | |
d6e04ae6 | 1147 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1148 | open_file->netfid, len, |
d6e04ae6 | 1149 | *poffset, &bytes_written, |
3e84469d | 1150 | iov, 1, long_op); |
d6e04ae6 | 1151 | } else |
60808233 SF |
1152 | rc = CIFSSMBWrite(xid, pTcon, |
1153 | open_file->netfid, | |
1154 | min_t(const int, cifs_sb->wsize, | |
1155 | write_size - total_written), | |
1156 | *poffset, &bytes_written, | |
1157 | write_data + total_written, | |
1158 | NULL, long_op); | |
1da177e4 LT |
1159 | } |
1160 | if (rc || (bytes_written == 0)) { | |
1161 | if (total_written) | |
1162 | break; | |
1163 | else { | |
1164 | FreeXid(xid); | |
1165 | return rc; | |
1166 | } | |
fbec9ab9 JL |
1167 | } else { |
1168 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1169 | *poffset += bytes_written; |
fbec9ab9 | 1170 | } |
133672ef | 1171 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1172 | 15 seconds is plenty */ |
1173 | } | |
1174 | ||
a4544347 | 1175 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1176 | |
1177 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1178 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1179 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1180 | /* file->f_path.dentry->d_inode->i_ctime = |
1181 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1182 | if (total_written > 0) { | |
1183 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1184 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1185 | i_size_write(file->f_path.dentry->d_inode, | |
1186 | *poffset); | |
1187 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1188 | } |
3677db10 | 1189 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1190 | } |
1191 | FreeXid(xid); | |
1192 | return total_written; | |
1193 | } | |
1194 | ||
630f3f0c SF |
1195 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1196 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1197 | { | |
1198 | struct cifsFileInfo *open_file = NULL; | |
1199 | ||
1200 | read_lock(&GlobalSMBSeslock); | |
1201 | /* we could simply get the first_list_entry since write-only entries | |
1202 | are always at the end of the list but since the first entry might | |
1203 | have a close pending, we go through the whole list */ | |
1204 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1205 | if (open_file->closePend) | |
1206 | continue; | |
1207 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1208 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1209 | if (!open_file->invalidHandle) { | |
1210 | /* found a good file */ | |
1211 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1212 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1213 | read_unlock(&GlobalSMBSeslock); |
1214 | return open_file; | |
1215 | } /* else might as well continue, and look for | |
1216 | another, or simply have the caller reopen it | |
1217 | again rather than trying to fix this handle */ | |
1218 | } else /* write only file */ | |
1219 | break; /* write only files are last so must be done */ | |
1220 | } | |
1221 | read_unlock(&GlobalSMBSeslock); | |
1222 | return NULL; | |
1223 | } | |
1224 | #endif | |
1225 | ||
dd99cd80 | 1226 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1227 | { |
1228 | struct cifsFileInfo *open_file; | |
2846d386 | 1229 | bool any_available = false; |
dd99cd80 | 1230 | int rc; |
6148a742 | 1231 | |
60808233 SF |
1232 | /* Having a null inode here (because mapping->host was set to zero by |
1233 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1234 | it being zero) during stress testcases so we need to check for it */ | |
1235 | ||
fb8c4b14 | 1236 | if (cifs_inode == NULL) { |
b6b38f70 | 1237 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1238 | dump_stack(); |
1239 | return NULL; | |
1240 | } | |
1241 | ||
6148a742 | 1242 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1243 | refind_writable: |
6148a742 | 1244 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1245 | if (open_file->closePend || |
1246 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1247 | continue; |
2846d386 | 1248 | |
6148a742 SF |
1249 | if (open_file->pfile && |
1250 | ((open_file->pfile->f_flags & O_RDWR) || | |
1251 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1252 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1253 | |
1254 | if (!open_file->invalidHandle) { | |
1255 | /* found a good writable file */ | |
1256 | read_unlock(&GlobalSMBSeslock); | |
1257 | return open_file; | |
1258 | } | |
8840dee9 | 1259 | |
6148a742 | 1260 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1261 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1262 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1263 | if (!rc) { |
9b22b0b7 SF |
1264 | if (!open_file->closePend) |
1265 | return open_file; | |
1266 | else { /* start over in case this was deleted */ | |
1267 | /* since the list could be modified */ | |
37c0eb46 | 1268 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1269 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1270 | goto refind_writable; |
37c0eb46 SF |
1271 | } |
1272 | } | |
9b22b0b7 SF |
1273 | |
1274 | /* if it fails, try another handle if possible - | |
1275 | (we can not do this if closePending since | |
1276 | loop could be modified - in which case we | |
1277 | have to start at the beginning of the list | |
1278 | again. Note that it would be bad | |
1279 | to hold up writepages here (rather than | |
1280 | in caller) with continuous retries */ | |
b6b38f70 | 1281 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1282 | read_lock(&GlobalSMBSeslock); |
1283 | /* can not use this handle, no write | |
1284 | pending on this one after all */ | |
6ab409b5 | 1285 | cifsFileInfo_put(open_file); |
8840dee9 | 1286 | |
9b22b0b7 SF |
1287 | if (open_file->closePend) /* list could have changed */ |
1288 | goto refind_writable; | |
1289 | /* else we simply continue to the next entry. Thus | |
1290 | we do not loop on reopen errors. If we | |
1291 | can not reopen the file, for example if we | |
1292 | reconnected to a server with another client | |
1293 | racing to delete or lock the file we would not | |
1294 | make progress if we restarted before the beginning | |
1295 | of the loop here. */ | |
6148a742 SF |
1296 | } |
1297 | } | |
2846d386 JL |
1298 | /* couldn't find useable FH with same pid, try any available */ |
1299 | if (!any_available) { | |
1300 | any_available = true; | |
1301 | goto refind_writable; | |
1302 | } | |
6148a742 SF |
1303 | read_unlock(&GlobalSMBSeslock); |
1304 | return NULL; | |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1308 | { | |
1309 | struct address_space *mapping = page->mapping; | |
1310 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1311 | char *write_data; | |
1312 | int rc = -EFAULT; | |
1313 | int bytes_written = 0; | |
1314 | struct cifs_sb_info *cifs_sb; | |
1315 | struct cifsTconInfo *pTcon; | |
1316 | struct inode *inode; | |
6148a742 | 1317 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1318 | |
1319 | if (!mapping || !mapping->host) | |
1320 | return -EFAULT; | |
1321 | ||
1322 | inode = page->mapping->host; | |
1323 | cifs_sb = CIFS_SB(inode->i_sb); | |
1324 | pTcon = cifs_sb->tcon; | |
1325 | ||
1326 | offset += (loff_t)from; | |
1327 | write_data = kmap(page); | |
1328 | write_data += from; | |
1329 | ||
1330 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1331 | kunmap(page); | |
1332 | return -EIO; | |
1333 | } | |
1334 | ||
1335 | /* racing with truncate? */ | |
1336 | if (offset > mapping->host->i_size) { | |
1337 | kunmap(page); | |
1338 | return 0; /* don't care */ | |
1339 | } | |
1340 | ||
1341 | /* check to make sure that we are not extending the file */ | |
1342 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1343 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1344 | |
6148a742 SF |
1345 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1346 | if (open_file) { | |
1347 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1348 | to-from, &offset); | |
6ab409b5 | 1349 | cifsFileInfo_put(open_file); |
1da177e4 | 1350 | /* Does mm or vfs already set times? */ |
6148a742 | 1351 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1352 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1353 | rc = 0; |
bb5a9a04 SF |
1354 | else if (bytes_written < 0) |
1355 | rc = bytes_written; | |
6148a742 | 1356 | } else { |
b6b38f70 | 1357 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1358 | rc = -EIO; |
1359 | } | |
1360 | ||
1361 | kunmap(page); | |
1362 | return rc; | |
1363 | } | |
1364 | ||
1da177e4 | 1365 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1366 | struct writeback_control *wbc) |
1da177e4 | 1367 | { |
37c0eb46 SF |
1368 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1369 | unsigned int bytes_to_write; | |
1370 | unsigned int bytes_written; | |
1371 | struct cifs_sb_info *cifs_sb; | |
1372 | int done = 0; | |
111ebb6e | 1373 | pgoff_t end; |
37c0eb46 | 1374 | pgoff_t index; |
fb8c4b14 SF |
1375 | int range_whole = 0; |
1376 | struct kvec *iov; | |
84d2f07e | 1377 | int len; |
37c0eb46 SF |
1378 | int n_iov = 0; |
1379 | pgoff_t next; | |
1380 | int nr_pages; | |
1381 | __u64 offset = 0; | |
23e7dd7d | 1382 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1383 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1384 | struct page *page; |
1385 | struct pagevec pvec; | |
1386 | int rc = 0; | |
1387 | int scanned = 0; | |
fbec9ab9 | 1388 | int xid, long_op; |
1da177e4 | 1389 | |
37c0eb46 | 1390 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1391 | |
37c0eb46 SF |
1392 | /* |
1393 | * If wsize is smaller that the page cache size, default to writing | |
1394 | * one page at a time via cifs_writepage | |
1395 | */ | |
1396 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1397 | return generic_writepages(mapping, wbc); | |
1398 | ||
fb8c4b14 SF |
1399 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1400 | if (cifs_sb->tcon->ses->server->secMode & | |
1401 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1402 | if (!experimEnabled) | |
60808233 | 1403 | return generic_writepages(mapping, wbc); |
4a77118c | 1404 | |
9a0c8230 | 1405 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1406 | if (iov == NULL) |
9a0c8230 SF |
1407 | return generic_writepages(mapping, wbc); |
1408 | ||
1409 | ||
37c0eb46 SF |
1410 | /* |
1411 | * BB: Is this meaningful for a non-block-device file system? | |
1412 | * If it is, we should test it again after we do I/O | |
1413 | */ | |
1414 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1415 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1416 | kfree(iov); |
37c0eb46 SF |
1417 | return 0; |
1418 | } | |
1419 | ||
1da177e4 LT |
1420 | xid = GetXid(); |
1421 | ||
37c0eb46 | 1422 | pagevec_init(&pvec, 0); |
111ebb6e | 1423 | if (wbc->range_cyclic) { |
37c0eb46 | 1424 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1425 | end = -1; |
1426 | } else { | |
1427 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1428 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1429 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1430 | range_whole = 1; | |
37c0eb46 SF |
1431 | scanned = 1; |
1432 | } | |
1433 | retry: | |
1434 | while (!done && (index <= end) && | |
1435 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1436 | PAGECACHE_TAG_DIRTY, | |
1437 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1438 | int first; | |
1439 | unsigned int i; | |
1440 | ||
37c0eb46 SF |
1441 | first = -1; |
1442 | next = 0; | |
1443 | n_iov = 0; | |
1444 | bytes_to_write = 0; | |
1445 | ||
1446 | for (i = 0; i < nr_pages; i++) { | |
1447 | page = pvec.pages[i]; | |
1448 | /* | |
1449 | * At this point we hold neither mapping->tree_lock nor | |
1450 | * lock on the page itself: the page may be truncated or | |
1451 | * invalidated (changing page->mapping to NULL), or even | |
1452 | * swizzled back from swapper_space to tmpfs file | |
1453 | * mapping | |
1454 | */ | |
1455 | ||
1456 | if (first < 0) | |
1457 | lock_page(page); | |
529ae9aa | 1458 | else if (!trylock_page(page)) |
37c0eb46 SF |
1459 | break; |
1460 | ||
1461 | if (unlikely(page->mapping != mapping)) { | |
1462 | unlock_page(page); | |
1463 | break; | |
1464 | } | |
1465 | ||
111ebb6e | 1466 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1467 | done = 1; |
1468 | unlock_page(page); | |
1469 | break; | |
1470 | } | |
1471 | ||
1472 | if (next && (page->index != next)) { | |
1473 | /* Not next consecutive page */ | |
1474 | unlock_page(page); | |
1475 | break; | |
1476 | } | |
1477 | ||
1478 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1479 | wait_on_page_writeback(page); | |
1480 | ||
1481 | if (PageWriteback(page) || | |
cb876f45 | 1482 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1483 | unlock_page(page); |
1484 | break; | |
1485 | } | |
84d2f07e | 1486 | |
cb876f45 LT |
1487 | /* |
1488 | * This actually clears the dirty bit in the radix tree. | |
1489 | * See cifs_writepage() for more commentary. | |
1490 | */ | |
1491 | set_page_writeback(page); | |
1492 | ||
84d2f07e SF |
1493 | if (page_offset(page) >= mapping->host->i_size) { |
1494 | done = 1; | |
1495 | unlock_page(page); | |
cb876f45 | 1496 | end_page_writeback(page); |
84d2f07e SF |
1497 | break; |
1498 | } | |
1499 | ||
37c0eb46 SF |
1500 | /* |
1501 | * BB can we get rid of this? pages are held by pvec | |
1502 | */ | |
1503 | page_cache_get(page); | |
1504 | ||
84d2f07e SF |
1505 | len = min(mapping->host->i_size - page_offset(page), |
1506 | (loff_t)PAGE_CACHE_SIZE); | |
1507 | ||
37c0eb46 SF |
1508 | /* reserve iov[0] for the smb header */ |
1509 | n_iov++; | |
1510 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1511 | iov[n_iov].iov_len = len; |
1512 | bytes_to_write += len; | |
37c0eb46 SF |
1513 | |
1514 | if (first < 0) { | |
1515 | first = i; | |
1516 | offset = page_offset(page); | |
1517 | } | |
1518 | next = page->index + 1; | |
1519 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1520 | break; | |
1521 | } | |
1522 | if (n_iov) { | |
23e7dd7d SF |
1523 | /* Search for a writable handle every time we call |
1524 | * CIFSSMBWrite2. We can't rely on the last handle | |
1525 | * we used to still be valid | |
1526 | */ | |
1527 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1528 | if (!open_file) { | |
b6b38f70 | 1529 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1530 | rc = -EBADF; |
1047abc1 | 1531 | } else { |
fbec9ab9 | 1532 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1533 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1534 | open_file->netfid, | |
1535 | bytes_to_write, offset, | |
1536 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1537 | long_op); |
6ab409b5 | 1538 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1539 | cifs_update_eof(cifsi, offset, bytes_written); |
1540 | ||
23e7dd7d | 1541 | if (rc || bytes_written < bytes_to_write) { |
b6b38f70 JP |
1542 | cERROR(1, "Write2 ret %d, wrote %d", |
1543 | rc, bytes_written); | |
23e7dd7d SF |
1544 | /* BB what if continued retry is |
1545 | requested via mount flags? */ | |
cea21805 JL |
1546 | if (rc == -ENOSPC) |
1547 | set_bit(AS_ENOSPC, &mapping->flags); | |
1548 | else | |
1549 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1550 | } else { |
1551 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1552 | bytes_written); | |
1553 | } | |
37c0eb46 SF |
1554 | } |
1555 | for (i = 0; i < n_iov; i++) { | |
1556 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1557 | /* Should we also set page error on |
1558 | success rc but too little data written? */ | |
1559 | /* BB investigate retry logic on temporary | |
1560 | server crash cases and how recovery works | |
fb8c4b14 SF |
1561 | when page marked as error */ |
1562 | if (rc) | |
eb9bdaa3 | 1563 | SetPageError(page); |
37c0eb46 SF |
1564 | kunmap(page); |
1565 | unlock_page(page); | |
cb876f45 | 1566 | end_page_writeback(page); |
37c0eb46 SF |
1567 | page_cache_release(page); |
1568 | } | |
1569 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1570 | done = 1; | |
1571 | index = next; | |
b066a48c DK |
1572 | } else |
1573 | /* Need to re-find the pages we skipped */ | |
1574 | index = pvec.pages[0]->index + 1; | |
1575 | ||
37c0eb46 SF |
1576 | pagevec_release(&pvec); |
1577 | } | |
1578 | if (!scanned && !done) { | |
1579 | /* | |
1580 | * We hit the last page and there is more work to be done: wrap | |
1581 | * back to the start of the file | |
1582 | */ | |
1583 | scanned = 1; | |
1584 | index = 0; | |
1585 | goto retry; | |
1586 | } | |
111ebb6e | 1587 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1588 | mapping->writeback_index = index; |
1589 | ||
1da177e4 | 1590 | FreeXid(xid); |
9a0c8230 | 1591 | kfree(iov); |
1da177e4 LT |
1592 | return rc; |
1593 | } | |
1da177e4 | 1594 | |
fb8c4b14 | 1595 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1596 | { |
1597 | int rc = -EFAULT; | |
1598 | int xid; | |
1599 | ||
1600 | xid = GetXid(); | |
1601 | /* BB add check for wbc flags */ | |
1602 | page_cache_get(page); | |
ad7a2926 | 1603 | if (!PageUptodate(page)) |
b6b38f70 | 1604 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1605 | |
1606 | /* | |
1607 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1608 | * | |
1609 | * A writepage() implementation always needs to do either this, | |
1610 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1611 | * the case of a failure. | |
1612 | * | |
1613 | * Just unlocking the page will cause the radix tree tag-bits | |
1614 | * to fail to update with the state of the page correctly. | |
1615 | */ | |
fb8c4b14 | 1616 | set_page_writeback(page); |
1da177e4 LT |
1617 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1618 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1619 | unlock_page(page); | |
cb876f45 LT |
1620 | end_page_writeback(page); |
1621 | page_cache_release(page); | |
1da177e4 LT |
1622 | FreeXid(xid); |
1623 | return rc; | |
1624 | } | |
1625 | ||
d9414774 NP |
1626 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1627 | loff_t pos, unsigned len, unsigned copied, | |
1628 | struct page *page, void *fsdata) | |
1da177e4 | 1629 | { |
d9414774 NP |
1630 | int rc; |
1631 | struct inode *inode = mapping->host; | |
1da177e4 | 1632 | |
b6b38f70 JP |
1633 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1634 | page, pos, copied); | |
d9414774 | 1635 | |
a98ee8c1 JL |
1636 | if (PageChecked(page)) { |
1637 | if (copied == len) | |
1638 | SetPageUptodate(page); | |
1639 | ClearPageChecked(page); | |
1640 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1641 | SetPageUptodate(page); |
ad7a2926 | 1642 | |
1da177e4 | 1643 | if (!PageUptodate(page)) { |
d9414774 NP |
1644 | char *page_data; |
1645 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1646 | int xid; | |
1647 | ||
1648 | xid = GetXid(); | |
1da177e4 LT |
1649 | /* this is probably better than directly calling |
1650 | partialpage_write since in this function the file handle is | |
1651 | known which we might as well leverage */ | |
1652 | /* BB check if anything else missing out of ppw | |
1653 | such as updating last write time */ | |
1654 | page_data = kmap(page); | |
d9414774 NP |
1655 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1656 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1657 | kunmap(page); |
d9414774 NP |
1658 | |
1659 | FreeXid(xid); | |
fb8c4b14 | 1660 | } else { |
d9414774 NP |
1661 | rc = copied; |
1662 | pos += copied; | |
1da177e4 LT |
1663 | set_page_dirty(page); |
1664 | } | |
1665 | ||
d9414774 NP |
1666 | if (rc > 0) { |
1667 | spin_lock(&inode->i_lock); | |
1668 | if (pos > inode->i_size) | |
1669 | i_size_write(inode, pos); | |
1670 | spin_unlock(&inode->i_lock); | |
1671 | } | |
1672 | ||
1673 | unlock_page(page); | |
1674 | page_cache_release(page); | |
1675 | ||
1da177e4 LT |
1676 | return rc; |
1677 | } | |
1678 | ||
1679 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1680 | { | |
1681 | int xid; | |
1682 | int rc = 0; | |
b298f223 SF |
1683 | struct cifsTconInfo *tcon; |
1684 | struct cifsFileInfo *smbfile = | |
1685 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1686 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1687 | |
1688 | xid = GetXid(); | |
1689 | ||
b6b38f70 JP |
1690 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
1691 | dentry->d_name.name, datasync); | |
50c2f753 | 1692 | |
cea21805 JL |
1693 | rc = filemap_write_and_wait(inode->i_mapping); |
1694 | if (rc == 0) { | |
1695 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1696 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1697 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1698 | if (!rc && tcon && smbfile && |
4717bed6 | 1699 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1700 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1701 | } |
b298f223 | 1702 | |
1da177e4 LT |
1703 | FreeXid(xid); |
1704 | return rc; | |
1705 | } | |
1706 | ||
3978d717 | 1707 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1708 | { |
1709 | struct address_space *mapping; | |
1710 | struct inode *inode; | |
1711 | unsigned long index = page->index; | |
1712 | unsigned int rpages = 0; | |
1713 | int rc = 0; | |
1714 | ||
f19159dc | 1715 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1716 | mapping = page->mapping; |
1717 | if (!mapping) | |
1718 | return 0; | |
1719 | inode = mapping->host; | |
1720 | if (!inode) | |
3978d717 | 1721 | return; */ |
1da177e4 | 1722 | |
fb8c4b14 | 1723 | /* fill in rpages then |
1da177e4 LT |
1724 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1725 | ||
b6b38f70 | 1726 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1727 | |
3978d717 | 1728 | #if 0 |
1da177e4 LT |
1729 | if (rc < 0) |
1730 | return rc; | |
1731 | return 0; | |
3978d717 | 1732 | #endif |
1da177e4 LT |
1733 | } */ |
1734 | ||
1735 | /* | |
1736 | * As file closes, flush all cached write data for this inode checking | |
1737 | * for write behind errors. | |
1738 | */ | |
75e1fcc0 | 1739 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1740 | { |
fb8c4b14 | 1741 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1742 | int rc = 0; |
1743 | ||
1744 | /* Rather than do the steps manually: | |
1745 | lock the inode for writing | |
1746 | loop through pages looking for write behind data (dirty pages) | |
1747 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1748 | send to server (prefer in parallel) | |
1749 | deal with writebehind errors | |
1750 | unlock inode for writing | |
1751 | filemapfdatawrite appears easier for the time being */ | |
1752 | ||
1753 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1754 | /* reset wb rc if we were able to write out dirty pages */ |
1755 | if (!rc) { | |
1756 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1757 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1758 | } |
50c2f753 | 1759 | |
b6b38f70 | 1760 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1761 | |
1762 | return rc; | |
1763 | } | |
1764 | ||
1765 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1766 | size_t read_size, loff_t *poffset) | |
1767 | { | |
1768 | int rc = -EACCES; | |
1769 | unsigned int bytes_read = 0; | |
1770 | unsigned int total_read = 0; | |
1771 | unsigned int current_read_size; | |
1772 | struct cifs_sb_info *cifs_sb; | |
1773 | struct cifsTconInfo *pTcon; | |
1774 | int xid; | |
1775 | struct cifsFileInfo *open_file; | |
1776 | char *smb_read_data; | |
1777 | char __user *current_offset; | |
1778 | struct smb_com_read_rsp *pSMBr; | |
1779 | ||
1780 | xid = GetXid(); | |
e6a00296 | 1781 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1782 | pTcon = cifs_sb->tcon; |
1783 | ||
1784 | if (file->private_data == NULL) { | |
0f3bc09e | 1785 | rc = -EBADF; |
1da177e4 | 1786 | FreeXid(xid); |
0f3bc09e | 1787 | return rc; |
1da177e4 LT |
1788 | } |
1789 | open_file = (struct cifsFileInfo *)file->private_data; | |
1790 | ||
ad7a2926 | 1791 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1792 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1793 | |
1da177e4 LT |
1794 | for (total_read = 0, current_offset = read_data; |
1795 | read_size > total_read; | |
1796 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1797 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1798 | cifs_sb->rsize); |
1799 | rc = -EAGAIN; | |
1800 | smb_read_data = NULL; | |
1801 | while (rc == -EAGAIN) { | |
ec637e3f | 1802 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1803 | if ((open_file->invalidHandle) && |
1da177e4 | 1804 | (!open_file->closePend)) { |
4b18f2a9 | 1805 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1806 | if (rc != 0) |
1807 | break; | |
1808 | } | |
bfa0d75a | 1809 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1810 | open_file->netfid, |
1811 | current_read_size, *poffset, | |
1812 | &bytes_read, &smb_read_data, | |
1813 | &buf_type); | |
1da177e4 | 1814 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1815 | if (smb_read_data) { |
93544cc6 SF |
1816 | if (copy_to_user(current_offset, |
1817 | smb_read_data + | |
1818 | 4 /* RFC1001 length field */ + | |
1819 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1820 | bytes_read)) |
93544cc6 | 1821 | rc = -EFAULT; |
93544cc6 | 1822 | |
fb8c4b14 | 1823 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1824 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1825 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1826 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1827 | smb_read_data = NULL; |
1828 | } | |
1829 | } | |
1830 | if (rc || (bytes_read == 0)) { | |
1831 | if (total_read) { | |
1832 | break; | |
1833 | } else { | |
1834 | FreeXid(xid); | |
1835 | return rc; | |
1836 | } | |
1837 | } else { | |
a4544347 | 1838 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1839 | *poffset += bytes_read; |
1840 | } | |
1841 | } | |
1842 | FreeXid(xid); | |
1843 | return total_read; | |
1844 | } | |
1845 | ||
1846 | ||
1847 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1848 | loff_t *poffset) | |
1849 | { | |
1850 | int rc = -EACCES; | |
1851 | unsigned int bytes_read = 0; | |
1852 | unsigned int total_read; | |
1853 | unsigned int current_read_size; | |
1854 | struct cifs_sb_info *cifs_sb; | |
1855 | struct cifsTconInfo *pTcon; | |
1856 | int xid; | |
1857 | char *current_offset; | |
1858 | struct cifsFileInfo *open_file; | |
ec637e3f | 1859 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1860 | |
1861 | xid = GetXid(); | |
e6a00296 | 1862 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1863 | pTcon = cifs_sb->tcon; |
1864 | ||
1865 | if (file->private_data == NULL) { | |
0f3bc09e | 1866 | rc = -EBADF; |
1da177e4 | 1867 | FreeXid(xid); |
0f3bc09e | 1868 | return rc; |
1da177e4 LT |
1869 | } |
1870 | open_file = (struct cifsFileInfo *)file->private_data; | |
1871 | ||
1872 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1873 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1874 | |
fb8c4b14 | 1875 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1876 | read_size > total_read; |
1877 | total_read += bytes_read, current_offset += bytes_read) { | |
1878 | current_read_size = min_t(const int, read_size - total_read, | |
1879 | cifs_sb->rsize); | |
f9f5c817 SF |
1880 | /* For windows me and 9x we do not want to request more |
1881 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1882 | if ((pTcon->ses) && |
f9f5c817 SF |
1883 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1884 | current_read_size = min_t(const int, current_read_size, | |
1885 | pTcon->ses->server->maxBuf - 128); | |
1886 | } | |
1da177e4 LT |
1887 | rc = -EAGAIN; |
1888 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1889 | if ((open_file->invalidHandle) && |
1da177e4 | 1890 | (!open_file->closePend)) { |
4b18f2a9 | 1891 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1892 | if (rc != 0) |
1893 | break; | |
1894 | } | |
bfa0d75a | 1895 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1896 | open_file->netfid, |
1897 | current_read_size, *poffset, | |
1898 | &bytes_read, ¤t_offset, | |
1899 | &buf_type); | |
1da177e4 LT |
1900 | } |
1901 | if (rc || (bytes_read == 0)) { | |
1902 | if (total_read) { | |
1903 | break; | |
1904 | } else { | |
1905 | FreeXid(xid); | |
1906 | return rc; | |
1907 | } | |
1908 | } else { | |
a4544347 | 1909 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1910 | *poffset += bytes_read; |
1911 | } | |
1912 | } | |
1913 | FreeXid(xid); | |
1914 | return total_read; | |
1915 | } | |
1916 | ||
1917 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1918 | { | |
1da177e4 LT |
1919 | int rc, xid; |
1920 | ||
1921 | xid = GetXid(); | |
abab095d | 1922 | rc = cifs_revalidate_file(file); |
1da177e4 | 1923 | if (rc) { |
b6b38f70 | 1924 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1925 | FreeXid(xid); |
1926 | return rc; | |
1927 | } | |
1928 | rc = generic_file_mmap(file, vma); | |
1929 | FreeXid(xid); | |
1930 | return rc; | |
1931 | } | |
1932 | ||
1933 | ||
fb8c4b14 | 1934 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1935 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
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 | ||
315e995c | 1947 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1948 | GFP_KERNEL)) { |
1949 | page_cache_release(page); | |
b6b38f70 | 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); | |
1da177e4 LT |
1973 | data += PAGE_CACHE_SIZE; |
1974 | } | |
1975 | return; | |
1976 | } | |
1977 | ||
1978 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1979 | struct list_head *page_list, unsigned num_pages) | |
1980 | { | |
1981 | int rc = -EACCES; | |
1982 | int xid; | |
1983 | loff_t offset; | |
1984 | struct page *page; | |
1985 | struct cifs_sb_info *cifs_sb; | |
1986 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1987 | unsigned int bytes_read = 0; |
fb8c4b14 | 1988 | unsigned int read_size, i; |
1da177e4 LT |
1989 | char *smb_read_data = NULL; |
1990 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1991 | struct cifsFileInfo *open_file; |
ec637e3f | 1992 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1993 | |
1994 | xid = GetXid(); | |
1995 | if (file->private_data == NULL) { | |
0f3bc09e | 1996 | rc = -EBADF; |
1da177e4 | 1997 | FreeXid(xid); |
0f3bc09e | 1998 | return rc; |
1da177e4 LT |
1999 | } |
2000 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2001 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2002 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2003 | |
f19159dc | 2004 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
2005 | for (i = 0; i < num_pages; ) { |
2006 | unsigned contig_pages; | |
2007 | struct page *tmp_page; | |
2008 | unsigned long expected_index; | |
2009 | ||
2010 | if (list_empty(page_list)) | |
2011 | break; | |
2012 | ||
2013 | page = list_entry(page_list->prev, struct page, lru); | |
2014 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2015 | ||
2016 | /* count adjacent pages that we will read into */ | |
2017 | contig_pages = 0; | |
fb8c4b14 | 2018 | expected_index = |
1da177e4 | 2019 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2020 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2021 | if (tmp_page->index == expected_index) { |
2022 | contig_pages++; | |
2023 | expected_index++; | |
2024 | } else | |
fb8c4b14 | 2025 | break; |
1da177e4 LT |
2026 | } |
2027 | if (contig_pages + i > num_pages) | |
2028 | contig_pages = num_pages - i; | |
2029 | ||
2030 | /* for reads over a certain size could initiate async | |
2031 | read ahead */ | |
2032 | ||
2033 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2034 | /* Read size needs to be in multiples of one page */ | |
2035 | read_size = min_t(const unsigned int, read_size, | |
2036 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2037 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2038 | read_size, contig_pages); | |
1da177e4 LT |
2039 | rc = -EAGAIN; |
2040 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2041 | if ((open_file->invalidHandle) && |
1da177e4 | 2042 | (!open_file->closePend)) { |
4b18f2a9 | 2043 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2044 | if (rc != 0) |
2045 | break; | |
2046 | } | |
2047 | ||
bfa0d75a | 2048 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2049 | open_file->netfid, |
2050 | read_size, offset, | |
2051 | &bytes_read, &smb_read_data, | |
2052 | &buf_type); | |
a9d02ad4 | 2053 | /* BB more RC checks ? */ |
fb8c4b14 | 2054 | if (rc == -EAGAIN) { |
1da177e4 | 2055 | if (smb_read_data) { |
fb8c4b14 | 2056 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2057 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2058 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2059 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2060 | smb_read_data = NULL; |
2061 | } | |
2062 | } | |
2063 | } | |
2064 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2065 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2066 | break; |
2067 | } else if (bytes_read > 0) { | |
6f88cc2e | 2068 | task_io_account_read(bytes_read); |
1da177e4 LT |
2069 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2070 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2071 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2072 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2073 | |
2074 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2075 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2076 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2077 | i++; /* account for partial page */ |
2078 | ||
fb8c4b14 | 2079 | /* server copy of file can have smaller size |
1da177e4 | 2080 | than client */ |
fb8c4b14 SF |
2081 | /* BB do we need to verify this common case ? |
2082 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2083 | we will hit it on next read */ |
2084 | ||
05ac9d4b | 2085 | /* break; */ |
1da177e4 LT |
2086 | } |
2087 | } else { | |
b6b38f70 | 2088 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2089 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2090 | bytes_read, offset); |
fb8c4b14 | 2091 | /* BB turn off caching and do new lookup on |
1da177e4 | 2092 | file size at server? */ |
1da177e4 LT |
2093 | break; |
2094 | } | |
2095 | if (smb_read_data) { | |
fb8c4b14 | 2096 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2097 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2098 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2099 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2100 | smb_read_data = NULL; |
2101 | } | |
2102 | bytes_read = 0; | |
2103 | } | |
2104 | ||
1da177e4 LT |
2105 | /* need to free smb_read_data buf before exit */ |
2106 | if (smb_read_data) { | |
fb8c4b14 | 2107 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2108 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2109 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2110 | cifs_buf_release(smb_read_data); |
1da177e4 | 2111 | smb_read_data = NULL; |
fb8c4b14 | 2112 | } |
1da177e4 LT |
2113 | |
2114 | FreeXid(xid); | |
2115 | return rc; | |
2116 | } | |
2117 | ||
2118 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2119 | loff_t *poffset) | |
2120 | { | |
2121 | char *read_data; | |
2122 | int rc; | |
2123 | ||
2124 | page_cache_get(page); | |
2125 | read_data = kmap(page); | |
2126 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2127 | |
1da177e4 | 2128 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2129 | |
1da177e4 LT |
2130 | if (rc < 0) |
2131 | goto io_error; | |
2132 | else | |
b6b38f70 | 2133 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2134 | |
e6a00296 JJS |
2135 | file->f_path.dentry->d_inode->i_atime = |
2136 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2137 | |
1da177e4 LT |
2138 | if (PAGE_CACHE_SIZE > rc) |
2139 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2140 | ||
2141 | flush_dcache_page(page); | |
2142 | SetPageUptodate(page); | |
2143 | rc = 0; | |
fb8c4b14 | 2144 | |
1da177e4 | 2145 | io_error: |
fb8c4b14 | 2146 | kunmap(page); |
1da177e4 LT |
2147 | page_cache_release(page); |
2148 | return rc; | |
2149 | } | |
2150 | ||
2151 | static int cifs_readpage(struct file *file, struct page *page) | |
2152 | { | |
2153 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2154 | int rc = -EACCES; | |
2155 | int xid; | |
2156 | ||
2157 | xid = GetXid(); | |
2158 | ||
2159 | if (file->private_data == NULL) { | |
0f3bc09e | 2160 | rc = -EBADF; |
1da177e4 | 2161 | FreeXid(xid); |
0f3bc09e | 2162 | return rc; |
1da177e4 LT |
2163 | } |
2164 | ||
b6b38f70 JP |
2165 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2166 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2167 | |
2168 | rc = cifs_readpage_worker(file, page, &offset); | |
2169 | ||
2170 | unlock_page(page); | |
2171 | ||
2172 | FreeXid(xid); | |
2173 | return rc; | |
2174 | } | |
2175 | ||
a403a0a3 SF |
2176 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2177 | { | |
2178 | struct cifsFileInfo *open_file; | |
2179 | ||
2180 | read_lock(&GlobalSMBSeslock); | |
2181 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2182 | if (open_file->closePend) | |
2183 | continue; | |
2184 | if (open_file->pfile && | |
2185 | ((open_file->pfile->f_flags & O_RDWR) || | |
2186 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2187 | read_unlock(&GlobalSMBSeslock); | |
2188 | return 1; | |
2189 | } | |
2190 | } | |
2191 | read_unlock(&GlobalSMBSeslock); | |
2192 | return 0; | |
2193 | } | |
2194 | ||
1da177e4 LT |
2195 | /* We do not want to update the file size from server for inodes |
2196 | open for write - to avoid races with writepage extending | |
2197 | the file - in the future we could consider allowing | |
fb8c4b14 | 2198 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2199 | but this is tricky to do without racing with writebehind |
2200 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2201 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2202 | { |
a403a0a3 | 2203 | if (!cifsInode) |
4b18f2a9 | 2204 | return true; |
50c2f753 | 2205 | |
a403a0a3 SF |
2206 | if (is_inode_writable(cifsInode)) { |
2207 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2208 | struct cifs_sb_info *cifs_sb; |
2209 | ||
c32a0b68 | 2210 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2211 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2212 | /* since no page cache to corrupt on directio |
c32a0b68 | 2213 | we can change size safely */ |
4b18f2a9 | 2214 | return true; |
c32a0b68 SF |
2215 | } |
2216 | ||
fb8c4b14 | 2217 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2218 | return true; |
7ba52631 | 2219 | |
4b18f2a9 | 2220 | return false; |
23e7dd7d | 2221 | } else |
4b18f2a9 | 2222 | return true; |
1da177e4 LT |
2223 | } |
2224 | ||
d9414774 NP |
2225 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2226 | loff_t pos, unsigned len, unsigned flags, | |
2227 | struct page **pagep, void **fsdata) | |
1da177e4 | 2228 | { |
d9414774 NP |
2229 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2230 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2231 | loff_t page_start = pos & PAGE_MASK; |
2232 | loff_t i_size; | |
2233 | struct page *page; | |
2234 | int rc = 0; | |
d9414774 | 2235 | |
b6b38f70 | 2236 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2237 | |
54566b2c | 2238 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2239 | if (!page) { |
2240 | rc = -ENOMEM; | |
2241 | goto out; | |
2242 | } | |
8a236264 | 2243 | |
a98ee8c1 JL |
2244 | if (PageUptodate(page)) |
2245 | goto out; | |
8a236264 | 2246 | |
a98ee8c1 JL |
2247 | /* |
2248 | * If we write a full page it will be up to date, no need to read from | |
2249 | * the server. If the write is short, we'll end up doing a sync write | |
2250 | * instead. | |
2251 | */ | |
2252 | if (len == PAGE_CACHE_SIZE) | |
2253 | goto out; | |
8a236264 | 2254 | |
a98ee8c1 JL |
2255 | /* |
2256 | * optimize away the read when we have an oplock, and we're not | |
2257 | * expecting to use any of the data we'd be reading in. That | |
2258 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2259 | * and the write will cover all of the existing data. | |
2260 | */ | |
2261 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2262 | i_size = i_size_read(mapping->host); | |
2263 | if (page_start >= i_size || | |
2264 | (offset == 0 && (pos + len) >= i_size)) { | |
2265 | zero_user_segments(page, 0, offset, | |
2266 | offset + len, | |
2267 | PAGE_CACHE_SIZE); | |
2268 | /* | |
2269 | * PageChecked means that the parts of the page | |
2270 | * to which we're not writing are considered up | |
2271 | * to date. Once the data is copied to the | |
2272 | * page, it can be set uptodate. | |
2273 | */ | |
2274 | SetPageChecked(page); | |
2275 | goto out; | |
2276 | } | |
2277 | } | |
d9414774 | 2278 | |
a98ee8c1 JL |
2279 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2280 | /* | |
2281 | * might as well read a page, it is fast enough. If we get | |
2282 | * an error, we don't need to return it. cifs_write_end will | |
2283 | * do a sync write instead since PG_uptodate isn't set. | |
2284 | */ | |
2285 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2286 | } else { |
2287 | /* we could try using another file handle if there is one - | |
2288 | but how would we lock it to prevent close of that handle | |
2289 | racing with this read? In any case | |
d9414774 | 2290 | this will be written out by write_end so is fine */ |
1da177e4 | 2291 | } |
a98ee8c1 JL |
2292 | out: |
2293 | *pagep = page; | |
2294 | return rc; | |
1da177e4 LT |
2295 | } |
2296 | ||
3bc303c2 JL |
2297 | static void |
2298 | cifs_oplock_break(struct slow_work *work) | |
2299 | { | |
2300 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2301 | oplock_break); | |
2302 | struct inode *inode = cfile->pInode; | |
2303 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2304 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2305 | int rc, waitrc = 0; | |
2306 | ||
2307 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2308 | if (cinode->clientCanCacheRead) |
8737c930 | 2309 | break_lease(inode, O_RDONLY); |
d54ff732 | 2310 | else |
8737c930 | 2311 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2312 | rc = filemap_fdatawrite(inode->i_mapping); |
2313 | if (cinode->clientCanCacheRead == 0) { | |
2314 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2315 | invalidate_remote_inode(inode); | |
2316 | } | |
2317 | if (!rc) | |
2318 | rc = waitrc; | |
2319 | if (rc) | |
2320 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2321 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2322 | } |
2323 | ||
2324 | /* | |
2325 | * releasing stale oplock after recent reconnect of smb session using | |
2326 | * a now incorrect file handle is not a data integrity issue but do | |
2327 | * not bother sending an oplock release if session to server still is | |
2328 | * disconnected since oplock already released by the server | |
2329 | */ | |
2330 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2331 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2332 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2333 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 JL |
2334 | } |
2335 | } | |
2336 | ||
2337 | static int | |
2338 | cifs_oplock_break_get(struct slow_work *work) | |
2339 | { | |
2340 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2341 | oplock_break); | |
2342 | mntget(cfile->mnt); | |
2343 | cifsFileInfo_get(cfile); | |
2344 | return 0; | |
2345 | } | |
2346 | ||
2347 | static void | |
2348 | cifs_oplock_break_put(struct slow_work *work) | |
2349 | { | |
2350 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2351 | oplock_break); | |
2352 | mntput(cfile->mnt); | |
2353 | cifsFileInfo_put(cfile); | |
2354 | } | |
2355 | ||
2356 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2357 | .get_ref = cifs_oplock_break_get, | |
2358 | .put_ref = cifs_oplock_break_put, | |
2359 | .execute = cifs_oplock_break, | |
2360 | }; | |
2361 | ||
f5e54d6e | 2362 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2363 | .readpage = cifs_readpage, |
2364 | .readpages = cifs_readpages, | |
2365 | .writepage = cifs_writepage, | |
37c0eb46 | 2366 | .writepages = cifs_writepages, |
d9414774 NP |
2367 | .write_begin = cifs_write_begin, |
2368 | .write_end = cifs_write_end, | |
1da177e4 LT |
2369 | .set_page_dirty = __set_page_dirty_nobuffers, |
2370 | /* .sync_page = cifs_sync_page, */ | |
2371 | /* .direct_IO = */ | |
2372 | }; | |
273d81d6 DK |
2373 | |
2374 | /* | |
2375 | * cifs_readpages requires the server to support a buffer large enough to | |
2376 | * contain the header plus one complete page of data. Otherwise, we need | |
2377 | * to leave cifs_readpages out of the address space operations. | |
2378 | */ | |
f5e54d6e | 2379 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2380 | .readpage = cifs_readpage, |
2381 | .writepage = cifs_writepage, | |
2382 | .writepages = cifs_writepages, | |
d9414774 NP |
2383 | .write_begin = cifs_write_begin, |
2384 | .write_end = cifs_write_end, | |
273d81d6 DK |
2385 | .set_page_dirty = __set_page_dirty_nobuffers, |
2386 | /* .sync_page = cifs_sync_page, */ | |
2387 | /* .direct_IO = */ | |
2388 | }; |