Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
7fc8f4e9 SF |
63 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
64 | { | |
65 | fmode_t posix_flags = 0; | |
e10f7b55 | 66 | |
7fc8f4e9 SF |
67 | if ((flags & O_ACCMODE) == O_RDONLY) |
68 | posix_flags = FMODE_READ; | |
69 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
70 | posix_flags = FMODE_WRITE; | |
71 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
72 | /* GENERIC_ALL is too much permission to request | |
73 | can cause unnecessary access denied on create */ | |
74 | /* return GENERIC_ALL; */ | |
75 | posix_flags = FMODE_READ | FMODE_WRITE; | |
76 | } | |
77 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
78 | reopening a file. They had their effect on the original open */ | |
79 | if (flags & O_APPEND) | |
80 | posix_flags |= (fmode_t)O_APPEND; | |
6b2f3d1f CH |
81 | if (flags & O_DSYNC) |
82 | posix_flags |= (fmode_t)O_DSYNC; | |
83 | if (flags & __O_SYNC) | |
84 | posix_flags |= (fmode_t)__O_SYNC; | |
7fc8f4e9 SF |
85 | if (flags & O_DIRECTORY) |
86 | posix_flags |= (fmode_t)O_DIRECTORY; | |
87 | if (flags & O_NOFOLLOW) | |
88 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
89 | if (flags & O_DIRECT) | |
90 | posix_flags |= (fmode_t)O_DIRECT; | |
91 | ||
92 | return posix_flags; | |
1da177e4 LT |
93 | } |
94 | ||
95 | static inline int cifs_get_disposition(unsigned int flags) | |
96 | { | |
97 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
98 | return FILE_CREATE; | |
99 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
100 | return FILE_OVERWRITE_IF; | |
101 | else if ((flags & O_CREAT) == O_CREAT) | |
102 | return FILE_OPEN_IF; | |
55aa2e09 SF |
103 | else if ((flags & O_TRUNC) == O_TRUNC) |
104 | return FILE_OVERWRITE; | |
1da177e4 LT |
105 | else |
106 | return FILE_OPEN; | |
107 | } | |
108 | ||
276a74a4 | 109 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
110 | static inline int |
111 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
51c81764 | 112 | struct cifsInodeInfo *pCifsInode, __u32 oplock, |
590a3fe0 | 113 | u16 netfid) |
276a74a4 | 114 | { |
276a74a4 | 115 | |
276a74a4 | 116 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
117 | |
118 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
119 | if (pCifsInode == NULL) { | |
120 | write_unlock(&GlobalSMBSeslock); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
276a74a4 SF |
124 | if (pCifsInode->clientCanCacheRead) { |
125 | /* we have the inode open somewhere else | |
126 | no need to discard cache data */ | |
127 | goto psx_client_can_cache; | |
128 | } | |
129 | ||
130 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
131 | BB fIX following section BB FIXME */ | |
132 | ||
133 | /* if not oplocked, invalidate inode pages if mtime or file | |
134 | size changed */ | |
135 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
136 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
137 | (file->f_path.dentry->d_inode->i_size == | |
138 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
b6b38f70 | 139 | cFYI(1, "inode unchanged on server"); |
276a74a4 SF |
140 | } else { |
141 | if (file->f_path.dentry->d_inode->i_mapping) { | |
142 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
143 | if (rc != 0) | |
144 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
145 | } | |
b6b38f70 JP |
146 | cFYI(1, "invalidating remote inode since open detected it " |
147 | "changed"); | |
276a74a4 SF |
148 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
149 | } */ | |
150 | ||
151 | psx_client_can_cache: | |
152 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
153 | pCifsInode->clientCanCacheAll = true; | |
154 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
155 | cFYI(1, "Exclusive Oplock granted on inode %p", |
156 | file->f_path.dentry->d_inode); | |
276a74a4 SF |
157 | } else if ((oplock & 0xF) == OPLOCK_READ) |
158 | pCifsInode->clientCanCacheRead = true; | |
159 | ||
160 | /* will have to change the unlock if we reenable the | |
161 | filemap_fdatawrite (which does not seem necessary */ | |
162 | write_unlock(&GlobalSMBSeslock); | |
163 | return 0; | |
164 | } | |
165 | ||
1da177e4 | 166 | /* all arguments to this function must be checked for validity in caller */ |
db460242 | 167 | static inline int cifs_open_inode_helper(struct inode *inode, |
a347ecb2 | 168 | struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf, |
1da177e4 LT |
169 | char *full_path, int xid) |
170 | { | |
db460242 | 171 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
1da177e4 LT |
172 | struct timespec temp; |
173 | int rc; | |
174 | ||
1da177e4 LT |
175 | if (pCifsInode->clientCanCacheRead) { |
176 | /* we have the inode open somewhere else | |
177 | no need to discard cache data */ | |
178 | goto client_can_cache; | |
179 | } | |
180 | ||
181 | /* BB need same check in cifs_create too? */ | |
182 | /* if not oplocked, invalidate inode pages if mtime or file | |
183 | size changed */ | |
07119a4d | 184 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
db460242 JL |
185 | if (timespec_equal(&inode->i_mtime, &temp) && |
186 | (inode->i_size == | |
1da177e4 | 187 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 188 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 189 | } else { |
db460242 | 190 | if (inode->i_mapping) { |
ff215713 SF |
191 | /* BB no need to lock inode until after invalidate |
192 | since namei code should already have it locked? */ | |
db460242 | 193 | rc = filemap_write_and_wait(inode->i_mapping); |
cea21805 | 194 | if (rc != 0) |
db460242 | 195 | pCifsInode->write_behind_rc = rc; |
1da177e4 | 196 | } |
b6b38f70 JP |
197 | cFYI(1, "invalidating remote inode since open detected it " |
198 | "changed"); | |
db460242 | 199 | invalidate_remote_inode(inode); |
1da177e4 LT |
200 | } |
201 | ||
202 | client_can_cache: | |
c18c842b | 203 | if (pTcon->unix_ext) |
db460242 JL |
204 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
205 | xid); | |
1da177e4 | 206 | else |
db460242 JL |
207 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
208 | xid, NULL); | |
1da177e4 | 209 | |
a347ecb2 | 210 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
4b18f2a9 SF |
211 | pCifsInode->clientCanCacheAll = true; |
212 | pCifsInode->clientCanCacheRead = true; | |
db460242 | 213 | cFYI(1, "Exclusive Oplock granted on inode %p", inode); |
a347ecb2 | 214 | } else if ((oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 215 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
216 | |
217 | return rc; | |
218 | } | |
219 | ||
220 | int cifs_open(struct inode *inode, struct file *file) | |
221 | { | |
222 | int rc = -EACCES; | |
590a3fe0 JL |
223 | int xid; |
224 | __u32 oplock; | |
1da177e4 | 225 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 226 | struct cifsTconInfo *tcon; |
7ffec372 | 227 | struct tcon_link *tlink; |
6ca9f3ba | 228 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 229 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
230 | char *full_path = NULL; |
231 | int desiredAccess; | |
232 | int disposition; | |
233 | __u16 netfid; | |
234 | FILE_ALL_INFO *buf = NULL; | |
235 | ||
236 | xid = GetXid(); | |
237 | ||
238 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
239 | tlink = cifs_sb_tlink(cifs_sb); |
240 | if (IS_ERR(tlink)) { | |
241 | FreeXid(xid); | |
242 | return PTR_ERR(tlink); | |
243 | } | |
244 | tcon = tlink_tcon(tlink); | |
1da177e4 | 245 | |
a6ce4932 | 246 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 247 | |
e6a00296 | 248 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 249 | if (full_path == NULL) { |
0f3bc09e | 250 | rc = -ENOMEM; |
232341ba | 251 | goto out; |
1da177e4 LT |
252 | } |
253 | ||
b6b38f70 JP |
254 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
255 | inode, file->f_flags, full_path); | |
276a74a4 SF |
256 | |
257 | if (oplockEnabled) | |
258 | oplock = REQ_OPLOCK; | |
259 | else | |
260 | oplock = 0; | |
261 | ||
64cc2c63 SF |
262 | if (!tcon->broken_posix_open && tcon->unix_ext && |
263 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
264 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
265 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
266 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
fa588e0c | 267 | oflags |= SMB_O_CREAT; |
276a74a4 | 268 | /* can not refresh inode info since size could be stale */ |
2422f676 | 269 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c SF |
270 | cifs_sb->mnt_file_mode /* ignored */, |
271 | oflags, &oplock, &netfid, xid); | |
276a74a4 | 272 | if (rc == 0) { |
b6b38f70 | 273 | cFYI(1, "posix open succeeded"); |
276a74a4 SF |
274 | /* no need for special case handling of setting mode |
275 | on read only files needed here */ | |
276 | ||
47c78b7f JL |
277 | rc = cifs_posix_open_inode_helper(inode, file, |
278 | pCifsInode, oplock, netfid); | |
279 | if (rc != 0) { | |
280 | CIFSSMBClose(xid, tcon, netfid); | |
281 | goto out; | |
282 | } | |
283 | ||
2422f676 JL |
284 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, |
285 | file->f_path.mnt, | |
13cfb733 | 286 | tlink, oflags, oplock); |
2422f676 JL |
287 | if (pCifsFile == NULL) { |
288 | CIFSSMBClose(xid, tcon, netfid); | |
289 | rc = -ENOMEM; | |
2422f676 | 290 | } |
9451a9a5 SJ |
291 | |
292 | cifs_fscache_set_inode_cookie(inode, file); | |
293 | ||
276a74a4 | 294 | goto out; |
64cc2c63 SF |
295 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
296 | if (tcon->ses->serverNOS) | |
b6b38f70 | 297 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
298 | " unexpected error on SMB posix open" |
299 | ", disabling posix open support." | |
300 | " Check if server update available.", | |
301 | tcon->ses->serverName, | |
b6b38f70 | 302 | tcon->ses->serverNOS); |
64cc2c63 | 303 | tcon->broken_posix_open = true; |
276a74a4 SF |
304 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
305 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
306 | goto out; | |
64cc2c63 SF |
307 | /* else fallthrough to retry open the old way on network i/o |
308 | or DFS errors */ | |
276a74a4 SF |
309 | } |
310 | ||
1da177e4 LT |
311 | desiredAccess = cifs_convert_flags(file->f_flags); |
312 | ||
313 | /********************************************************************* | |
314 | * open flag mapping table: | |
fb8c4b14 | 315 | * |
1da177e4 | 316 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 317 | * ---------- ---------------- |
1da177e4 LT |
318 | * O_CREAT FILE_OPEN_IF |
319 | * O_CREAT | O_EXCL FILE_CREATE | |
320 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
321 | * O_TRUNC FILE_OVERWRITE | |
322 | * none of the above FILE_OPEN | |
323 | * | |
324 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 325 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
326 | * O_CREAT | O_TRUNC is similar but truncates the existing |
327 | * file rather than creating a new file as FILE_SUPERSEDE does | |
328 | * (which uses the attributes / metadata passed in on open call) | |
329 | *? | |
fb8c4b14 | 330 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
331 | *? and the read write flags match reasonably. O_LARGEFILE |
332 | *? is irrelevant because largefile support is always used | |
333 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
334 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
335 | *********************************************************************/ | |
336 | ||
337 | disposition = cifs_get_disposition(file->f_flags); | |
338 | ||
1da177e4 LT |
339 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
340 | ||
341 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
342 | and calling get_inode_info with returned buf (at least helps | |
343 | non-Unix server case) */ | |
344 | ||
fb8c4b14 SF |
345 | /* BB we can not do this if this is the second open of a file |
346 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
347 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
348 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
349 | if (!buf) { | |
350 | rc = -ENOMEM; | |
351 | goto out; | |
352 | } | |
5bafd765 | 353 | |
a6e8a845 | 354 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
276a74a4 | 355 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 356 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
357 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
358 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
359 | else |
360 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
361 | ||
a9d02ad4 SF |
362 | if (rc == -EIO) { |
363 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 364 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
365 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
366 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
367 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
368 | } | |
1da177e4 | 369 | if (rc) { |
b6b38f70 | 370 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
371 | goto out; |
372 | } | |
3321b791 | 373 | |
a347ecb2 | 374 | rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid); |
47c78b7f JL |
375 | if (rc != 0) |
376 | goto out; | |
377 | ||
086f68bd | 378 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
13cfb733 | 379 | tlink, file->f_flags, oplock); |
6ca9f3ba | 380 | if (pCifsFile == NULL) { |
1da177e4 LT |
381 | rc = -ENOMEM; |
382 | goto out; | |
383 | } | |
1da177e4 | 384 | |
9451a9a5 SJ |
385 | cifs_fscache_set_inode_cookie(inode, file); |
386 | ||
fb8c4b14 | 387 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
388 | /* time to set mode which we can not set earlier due to |
389 | problems creating new read-only files */ | |
276a74a4 | 390 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
391 | struct cifs_unix_set_info_args args = { |
392 | .mode = inode->i_mode, | |
393 | .uid = NO_CHANGE_64, | |
394 | .gid = NO_CHANGE_64, | |
395 | .ctime = NO_CHANGE_64, | |
396 | .atime = NO_CHANGE_64, | |
397 | .mtime = NO_CHANGE_64, | |
398 | .device = 0, | |
399 | }; | |
01ea95e3 JL |
400 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
401 | cifs_sb->local_nls, | |
402 | cifs_sb->mnt_cifs_flags & | |
737b758c | 403 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
407 | out: | |
408 | kfree(buf); | |
409 | kfree(full_path); | |
410 | FreeXid(xid); | |
7ffec372 | 411 | cifs_put_tlink(tlink); |
1da177e4 LT |
412 | return rc; |
413 | } | |
414 | ||
0418726b | 415 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
416 | /* to server was lost */ |
417 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
418 | { | |
419 | int rc = 0; | |
420 | ||
421 | /* BB list all locks open on this file and relock */ | |
422 | ||
423 | return rc; | |
424 | } | |
425 | ||
4b18f2a9 | 426 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
427 | { |
428 | int rc = -EACCES; | |
590a3fe0 JL |
429 | int xid; |
430 | __u32 oplock; | |
1da177e4 | 431 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 432 | struct cifsTconInfo *tcon; |
1da177e4 LT |
433 | struct cifsFileInfo *pCifsFile; |
434 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 435 | struct inode *inode; |
1da177e4 LT |
436 | char *full_path = NULL; |
437 | int desiredAccess; | |
438 | int disposition = FILE_OPEN; | |
439 | __u16 netfid; | |
440 | ||
ad7a2926 | 441 | if (file->private_data) |
c21dfb69 | 442 | pCifsFile = file->private_data; |
ad7a2926 | 443 | else |
1da177e4 LT |
444 | return -EBADF; |
445 | ||
446 | xid = GetXid(); | |
f0a71eb8 | 447 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 448 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 449 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 450 | rc = 0; |
1da177e4 | 451 | FreeXid(xid); |
0f3bc09e | 452 | return rc; |
1da177e4 LT |
453 | } |
454 | ||
e6a00296 | 455 | if (file->f_path.dentry == NULL) { |
b6b38f70 | 456 | cERROR(1, "no valid name if dentry freed"); |
3a9f462f SF |
457 | dump_stack(); |
458 | rc = -EBADF; | |
459 | goto reopen_error_exit; | |
460 | } | |
461 | ||
462 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 463 | if (inode == NULL) { |
b6b38f70 | 464 | cERROR(1, "inode not valid"); |
3a9f462f SF |
465 | dump_stack(); |
466 | rc = -EBADF; | |
467 | goto reopen_error_exit; | |
1da177e4 | 468 | } |
50c2f753 | 469 | |
1da177e4 | 470 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 471 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 472 | |
1da177e4 LT |
473 | /* can not grab rename sem here because various ops, including |
474 | those that already have the rename sem can end up causing writepage | |
475 | to get called and if the server was down that means we end up here, | |
476 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 477 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 478 | if (full_path == NULL) { |
3a9f462f SF |
479 | rc = -ENOMEM; |
480 | reopen_error_exit: | |
f0a71eb8 | 481 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 482 | FreeXid(xid); |
3a9f462f | 483 | return rc; |
1da177e4 LT |
484 | } |
485 | ||
b6b38f70 JP |
486 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
487 | inode, file->f_flags, full_path); | |
1da177e4 LT |
488 | |
489 | if (oplockEnabled) | |
490 | oplock = REQ_OPLOCK; | |
491 | else | |
4b18f2a9 | 492 | oplock = 0; |
1da177e4 | 493 | |
7fc8f4e9 SF |
494 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
495 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
496 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
497 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
498 | /* can not refresh inode info since size could be stale */ | |
2422f676 | 499 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
500 | cifs_sb->mnt_file_mode /* ignored */, |
501 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 502 | if (rc == 0) { |
b6b38f70 | 503 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
504 | goto reopen_success; |
505 | } | |
506 | /* fallthrough to retry open the old way on errors, especially | |
507 | in the reconnect path it is important to retry hard */ | |
508 | } | |
509 | ||
510 | desiredAccess = cifs_convert_flags(file->f_flags); | |
511 | ||
1da177e4 | 512 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
513 | by SMBOpen and then calling get_inode_info with returned buf |
514 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
515 | and server version of file size can be stale. If we knew for sure |
516 | that inode was not dirty locally we could do this */ | |
517 | ||
7fc8f4e9 | 518 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 519 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 520 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 521 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 522 | if (rc) { |
f0a71eb8 | 523 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
524 | cFYI(1, "cifs_open returned 0x%x", rc); |
525 | cFYI(1, "oplock: %d", oplock); | |
1da177e4 | 526 | } else { |
7fc8f4e9 | 527 | reopen_success: |
1da177e4 | 528 | pCifsFile->netfid = netfid; |
4b18f2a9 | 529 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 530 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
531 | pCifsInode = CIFS_I(inode); |
532 | if (pCifsInode) { | |
533 | if (can_flush) { | |
cea21805 JL |
534 | rc = filemap_write_and_wait(inode->i_mapping); |
535 | if (rc != 0) | |
536 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
537 | /* temporarily disable caching while we |
538 | go to server to get inode info */ | |
4b18f2a9 SF |
539 | pCifsInode->clientCanCacheAll = false; |
540 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 541 | if (tcon->unix_ext) |
1da177e4 LT |
542 | rc = cifs_get_inode_info_unix(&inode, |
543 | full_path, inode->i_sb, xid); | |
544 | else | |
545 | rc = cifs_get_inode_info(&inode, | |
546 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 547 | xid, NULL); |
1da177e4 LT |
548 | } /* else we are writing out data to server already |
549 | and could deadlock if we tried to flush data, and | |
550 | since we do not know if we have data that would | |
551 | invalidate the current end of file on the server | |
552 | we can not go to the server to get the new inod | |
553 | info */ | |
554 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
555 | pCifsInode->clientCanCacheAll = true; |
556 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
557 | cFYI(1, "Exclusive Oplock granted on inode %p", |
558 | file->f_path.dentry->d_inode); | |
1da177e4 | 559 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
560 | pCifsInode->clientCanCacheRead = true; |
561 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 562 | } else { |
4b18f2a9 SF |
563 | pCifsInode->clientCanCacheRead = false; |
564 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
565 | } |
566 | cifs_relock_file(pCifsFile); | |
567 | } | |
568 | } | |
1da177e4 LT |
569 | kfree(full_path); |
570 | FreeXid(xid); | |
571 | return rc; | |
572 | } | |
573 | ||
574 | int cifs_close(struct inode *inode, struct file *file) | |
575 | { | |
576 | int rc = 0; | |
15745320 | 577 | int xid, timeout; |
1da177e4 LT |
578 | struct cifs_sb_info *cifs_sb; |
579 | struct cifsTconInfo *pTcon; | |
c21dfb69 | 580 | struct cifsFileInfo *pSMBFile = file->private_data; |
1da177e4 LT |
581 | |
582 | xid = GetXid(); | |
583 | ||
584 | cifs_sb = CIFS_SB(inode->i_sb); | |
13cfb733 | 585 | pTcon = tlink_tcon(pSMBFile->tlink); |
1da177e4 | 586 | if (pSMBFile) { |
7ee1af76 | 587 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 588 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 589 | pSMBFile->closePend = true; |
1da177e4 LT |
590 | if (pTcon) { |
591 | /* no sense reconnecting to close a file that is | |
592 | already closed */ | |
3b795210 | 593 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 594 | write_unlock(&GlobalSMBSeslock); |
15745320 | 595 | timeout = 2; |
6ab409b5 | 596 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 597 | && (timeout <= 2048)) { |
23e7dd7d SF |
598 | /* Give write a better chance to get to |
599 | server ahead of the close. We do not | |
600 | want to add a wait_q here as it would | |
601 | increase the memory utilization as | |
602 | the struct would be in each open file, | |
fb8c4b14 | 603 | but this should give enough time to |
23e7dd7d | 604 | clear the socket */ |
b6b38f70 | 605 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
606 | msleep(timeout); |
607 | timeout *= 4; | |
4891d539 | 608 | } |
ddb4cbfc SF |
609 | if (!pTcon->need_reconnect && |
610 | !pSMBFile->invalidHandle) | |
611 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 612 | pSMBFile->netfid); |
ddb4cbfc SF |
613 | } else |
614 | write_unlock(&GlobalSMBSeslock); | |
615 | } else | |
616 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
617 | |
618 | /* Delete any outstanding lock records. | |
619 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 620 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
621 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
622 | list_del(&li->llist); | |
623 | kfree(li); | |
624 | } | |
796e5661 | 625 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 626 | |
cbe0476f | 627 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
628 | list_del(&pSMBFile->flist); |
629 | list_del(&pSMBFile->tlist); | |
cbe0476f | 630 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 631 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
632 | file->private_data = NULL; |
633 | } else | |
634 | rc = -EBADF; | |
635 | ||
4efa53f0 | 636 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 637 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 638 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
639 | /* if the file is not open we do not know if we can cache info |
640 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
641 | CIFS_I(inode)->clientCanCacheRead = false; |
642 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 643 | } |
4efa53f0 | 644 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 645 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
646 | rc = CIFS_I(inode)->write_behind_rc; |
647 | FreeXid(xid); | |
648 | return rc; | |
649 | } | |
650 | ||
651 | int cifs_closedir(struct inode *inode, struct file *file) | |
652 | { | |
653 | int rc = 0; | |
654 | int xid; | |
c21dfb69 | 655 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
656 | char *ptmp; |
657 | ||
b6b38f70 | 658 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
659 | |
660 | xid = GetXid(); | |
661 | ||
662 | if (pCFileStruct) { | |
13cfb733 | 663 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 664 | |
b6b38f70 | 665 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 666 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
667 | if (!pCFileStruct->srch_inf.endOfSearch && |
668 | !pCFileStruct->invalidHandle) { | |
669 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 670 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 671 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
672 | cFYI(1, "Closing uncompleted readdir with rc %d", |
673 | rc); | |
1da177e4 LT |
674 | /* not much we can do if it fails anyway, ignore rc */ |
675 | rc = 0; | |
ddb4cbfc SF |
676 | } else |
677 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
678 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
679 | if (ptmp) { | |
b6b38f70 | 680 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 681 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 682 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
683 | cifs_small_buf_release(ptmp); |
684 | else | |
685 | cifs_buf_release(ptmp); | |
1da177e4 | 686 | } |
13cfb733 | 687 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
688 | kfree(file->private_data); |
689 | file->private_data = NULL; | |
690 | } | |
691 | /* BB can we lock the filestruct while this is going on? */ | |
692 | FreeXid(xid); | |
693 | return rc; | |
694 | } | |
695 | ||
7ee1af76 JA |
696 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
697 | __u64 offset, __u8 lockType) | |
698 | { | |
fb8c4b14 SF |
699 | struct cifsLockInfo *li = |
700 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
701 | if (li == NULL) |
702 | return -ENOMEM; | |
703 | li->offset = offset; | |
704 | li->length = len; | |
705 | li->type = lockType; | |
796e5661 | 706 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 707 | list_add(&li->llist, &fid->llist); |
796e5661 | 708 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
709 | return 0; |
710 | } | |
711 | ||
1da177e4 LT |
712 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
713 | { | |
714 | int rc, xid; | |
1da177e4 LT |
715 | __u32 numLock = 0; |
716 | __u32 numUnlock = 0; | |
717 | __u64 length; | |
4b18f2a9 | 718 | bool wait_flag = false; |
1da177e4 | 719 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 720 | struct cifsTconInfo *tcon; |
08547b03 SF |
721 | __u16 netfid; |
722 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 723 | bool posix_locking = 0; |
1da177e4 LT |
724 | |
725 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
726 | rc = -EACCES; | |
727 | xid = GetXid(); | |
728 | ||
b6b38f70 | 729 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 730 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 731 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 732 | pfLock->fl_end); |
1da177e4 LT |
733 | |
734 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 735 | cFYI(1, "Posix"); |
1da177e4 | 736 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 737 | cFYI(1, "Flock"); |
1da177e4 | 738 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 739 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 740 | wait_flag = true; |
1da177e4 LT |
741 | } |
742 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
743 | cFYI(1, "Process suspended by mandatory locking - " |
744 | "not implemented yet"); | |
1da177e4 | 745 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 746 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 747 | if (pfLock->fl_flags & |
1da177e4 | 748 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 749 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
750 | |
751 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 752 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
753 | numLock = 1; |
754 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 755 | cFYI(1, "F_UNLCK"); |
1da177e4 | 756 | numUnlock = 1; |
d47d7c1a SF |
757 | /* Check if unlock includes more than |
758 | one lock range */ | |
1da177e4 | 759 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 760 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
761 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
762 | numLock = 1; | |
763 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 764 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
765 | numLock = 1; |
766 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 767 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
768 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
769 | numLock = 1; | |
770 | } else | |
b6b38f70 | 771 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 772 | |
e6a00296 | 773 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 774 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
1da177e4 LT |
775 | |
776 | if (file->private_data == NULL) { | |
0f3bc09e | 777 | rc = -EBADF; |
1da177e4 | 778 | FreeXid(xid); |
0f3bc09e | 779 | return rc; |
1da177e4 | 780 | } |
08547b03 SF |
781 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
782 | ||
13a6e42a SF |
783 | if ((tcon->ses->capabilities & CAP_UNIX) && |
784 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 785 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 786 | posix_locking = 1; |
08547b03 SF |
787 | /* BB add code here to normalize offset and length to |
788 | account for negative length which we can not accept over the | |
789 | wire */ | |
1da177e4 | 790 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 791 | if (posix_locking) { |
08547b03 | 792 | int posix_lock_type; |
fb8c4b14 | 793 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
794 | posix_lock_type = CIFS_RDLCK; |
795 | else | |
796 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 797 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 798 | length, pfLock, |
08547b03 SF |
799 | posix_lock_type, wait_flag); |
800 | FreeXid(xid); | |
801 | return rc; | |
802 | } | |
803 | ||
804 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 805 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 806 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 807 | if (rc == 0) { |
13a6e42a | 808 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
809 | pfLock->fl_start, 1 /* numUnlock */ , |
810 | 0 /* numLock */ , lockType, | |
811 | 0 /* wait flag */ ); | |
812 | pfLock->fl_type = F_UNLCK; | |
813 | if (rc != 0) | |
b6b38f70 JP |
814 | cERROR(1, "Error unlocking previously locked " |
815 | "range %d during test of lock", rc); | |
1da177e4 LT |
816 | rc = 0; |
817 | ||
818 | } else { | |
819 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
820 | rc = 0; |
821 | ||
822 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
823 | pfLock->fl_type = F_WRLCK; | |
824 | } else { | |
825 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
826 | pfLock->fl_start, 0, 1, | |
827 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
828 | 0 /* wait flag */); | |
829 | if (rc == 0) { | |
830 | rc = CIFSSMBLock(xid, tcon, netfid, | |
831 | length, pfLock->fl_start, 1, 0, | |
832 | lockType | | |
833 | LOCKING_ANDX_SHARED_LOCK, | |
834 | 0 /* wait flag */); | |
835 | pfLock->fl_type = F_RDLCK; | |
836 | if (rc != 0) | |
f19159dc | 837 | cERROR(1, "Error unlocking " |
f05337c6 | 838 | "previously locked range %d " |
f19159dc | 839 | "during test of lock", rc); |
f05337c6 PS |
840 | rc = 0; |
841 | } else { | |
842 | pfLock->fl_type = F_WRLCK; | |
843 | rc = 0; | |
844 | } | |
845 | } | |
1da177e4 LT |
846 | } |
847 | ||
848 | FreeXid(xid); | |
849 | return rc; | |
850 | } | |
7ee1af76 JA |
851 | |
852 | if (!numLock && !numUnlock) { | |
853 | /* if no lock or unlock then nothing | |
854 | to do since we do not know what it is */ | |
855 | FreeXid(xid); | |
856 | return -EOPNOTSUPP; | |
857 | } | |
858 | ||
859 | if (posix_locking) { | |
08547b03 | 860 | int posix_lock_type; |
fb8c4b14 | 861 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
862 | posix_lock_type = CIFS_RDLCK; |
863 | else | |
864 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 865 | |
fb8c4b14 | 866 | if (numUnlock == 1) |
beb84dc8 | 867 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 868 | |
13a6e42a | 869 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 870 | length, pfLock, |
08547b03 | 871 | posix_lock_type, wait_flag); |
7ee1af76 | 872 | } else { |
c21dfb69 | 873 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
874 | |
875 | if (numLock) { | |
13a6e42a | 876 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 877 | pfLock->fl_start, |
7ee1af76 JA |
878 | 0, numLock, lockType, wait_flag); |
879 | ||
880 | if (rc == 0) { | |
881 | /* For Windows locks we must store them. */ | |
882 | rc = store_file_lock(fid, length, | |
883 | pfLock->fl_start, lockType); | |
884 | } | |
885 | } else if (numUnlock) { | |
886 | /* For each stored lock that this unlock overlaps | |
887 | completely, unlock it. */ | |
888 | int stored_rc = 0; | |
889 | struct cifsLockInfo *li, *tmp; | |
890 | ||
6b70c955 | 891 | rc = 0; |
796e5661 | 892 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
893 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
894 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 895 | (pfLock->fl_start + length) >= |
39db810c | 896 | (li->offset + li->length)) { |
13a6e42a | 897 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 898 | netfid, |
7ee1af76 | 899 | li->length, li->offset, |
4b18f2a9 | 900 | 1, 0, li->type, false); |
7ee1af76 JA |
901 | if (stored_rc) |
902 | rc = stored_rc; | |
2c964d1f PS |
903 | else { |
904 | list_del(&li->llist); | |
905 | kfree(li); | |
906 | } | |
7ee1af76 JA |
907 | } |
908 | } | |
796e5661 | 909 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
910 | } |
911 | } | |
912 | ||
d634cc15 | 913 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
914 | posix_lock_file_wait(file, pfLock); |
915 | FreeXid(xid); | |
916 | return rc; | |
917 | } | |
918 | ||
fbec9ab9 JL |
919 | /* |
920 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
921 | * these calls can be very long. | |
922 | * | |
923 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
924 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
925 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
926 | * welcome if someone wants to suggest one. | |
927 | * | |
928 | * We may be able to do a better job with this if there were some way to | |
929 | * declare that a file should be sparse. | |
930 | */ | |
931 | static int | |
932 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
933 | { | |
934 | if (offset <= cifsi->server_eof) | |
935 | return CIFS_STD_OP; | |
936 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
937 | return CIFS_VLONG_OP; | |
938 | else | |
939 | return CIFS_LONG_OP; | |
940 | } | |
941 | ||
942 | /* update the file size (if needed) after a write */ | |
943 | static void | |
944 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
945 | unsigned int bytes_written) | |
946 | { | |
947 | loff_t end_of_write = offset + bytes_written; | |
948 | ||
949 | if (end_of_write > cifsi->server_eof) | |
950 | cifsi->server_eof = end_of_write; | |
951 | } | |
952 | ||
1da177e4 LT |
953 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
954 | size_t write_size, loff_t *poffset) | |
955 | { | |
956 | int rc = 0; | |
957 | unsigned int bytes_written = 0; | |
958 | unsigned int total_written; | |
959 | struct cifs_sb_info *cifs_sb; | |
960 | struct cifsTconInfo *pTcon; | |
961 | int xid, long_op; | |
962 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 963 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 964 | |
e6a00296 | 965 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 966 | |
b6b38f70 JP |
967 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
968 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
969 | |
970 | if (file->private_data == NULL) | |
971 | return -EBADF; | |
ba00ba64 | 972 | |
c21dfb69 | 973 | open_file = file->private_data; |
13cfb733 | 974 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 975 | |
838726c4 JL |
976 | rc = generic_write_checks(file, poffset, &write_size, 0); |
977 | if (rc) | |
978 | return rc; | |
979 | ||
1da177e4 | 980 | xid = GetXid(); |
1da177e4 | 981 | |
fbec9ab9 | 982 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
983 | for (total_written = 0; write_size > total_written; |
984 | total_written += bytes_written) { | |
985 | rc = -EAGAIN; | |
986 | while (rc == -EAGAIN) { | |
987 | if (file->private_data == NULL) { | |
988 | /* file has been closed on us */ | |
989 | FreeXid(xid); | |
990 | /* if we have gotten here we have written some data | |
991 | and blocked, and the file has been freed on us while | |
992 | we blocked so return what we managed to write */ | |
993 | return total_written; | |
fb8c4b14 | 994 | } |
1da177e4 LT |
995 | if (open_file->closePend) { |
996 | FreeXid(xid); | |
997 | if (total_written) | |
998 | return total_written; | |
999 | else | |
1000 | return -EBADF; | |
1001 | } | |
1002 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1003 | /* we could deadlock if we called |
1004 | filemap_fdatawait from here so tell | |
1005 | reopen_file not to flush data to server | |
1006 | now */ | |
4b18f2a9 | 1007 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1008 | if (rc != 0) |
1009 | break; | |
1010 | } | |
1011 | ||
1012 | rc = CIFSSMBWrite(xid, pTcon, | |
1013 | open_file->netfid, | |
1014 | min_t(const int, cifs_sb->wsize, | |
1015 | write_size - total_written), | |
1016 | *poffset, &bytes_written, | |
1017 | NULL, write_data + total_written, long_op); | |
1018 | } | |
1019 | if (rc || (bytes_written == 0)) { | |
1020 | if (total_written) | |
1021 | break; | |
1022 | else { | |
1023 | FreeXid(xid); | |
1024 | return rc; | |
1025 | } | |
fbec9ab9 JL |
1026 | } else { |
1027 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1028 | *poffset += bytes_written; |
fbec9ab9 | 1029 | } |
133672ef | 1030 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1031 | 15 seconds is plenty */ |
1032 | } | |
1033 | ||
a4544347 | 1034 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1035 | |
1036 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1037 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1038 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1039 | /* Do not update local mtime - server will set its actual value on write |
1040 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1041 | * current_fs_time(inode->i_sb);*/ |
1042 | if (total_written > 0) { | |
1043 | spin_lock(&inode->i_lock); | |
1044 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1045 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1046 | *poffset); |
3677db10 | 1047 | spin_unlock(&inode->i_lock); |
1da177e4 | 1048 | } |
fb8c4b14 | 1049 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1050 | } |
1051 | FreeXid(xid); | |
1052 | return total_written; | |
1053 | } | |
1054 | ||
1055 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1056 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1057 | { |
1058 | int rc = 0; | |
1059 | unsigned int bytes_written = 0; | |
1060 | unsigned int total_written; | |
1061 | struct cifs_sb_info *cifs_sb; | |
1062 | struct cifsTconInfo *pTcon; | |
1063 | int xid, long_op; | |
1064 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1065 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1066 | |
e6a00296 | 1067 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1068 | |
b6b38f70 JP |
1069 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1070 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1071 | |
1072 | if (file->private_data == NULL) | |
1073 | return -EBADF; | |
c21dfb69 | 1074 | open_file = file->private_data; |
13cfb733 | 1075 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 1076 | |
1da177e4 | 1077 | xid = GetXid(); |
1da177e4 | 1078 | |
fbec9ab9 | 1079 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1080 | for (total_written = 0; write_size > total_written; |
1081 | total_written += bytes_written) { | |
1082 | rc = -EAGAIN; | |
1083 | while (rc == -EAGAIN) { | |
1084 | if (file->private_data == NULL) { | |
1085 | /* file has been closed on us */ | |
1086 | FreeXid(xid); | |
1087 | /* if we have gotten here we have written some data | |
1088 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1089 | while we blocked so return what we managed to |
1da177e4 LT |
1090 | write */ |
1091 | return total_written; | |
fb8c4b14 | 1092 | } |
1da177e4 LT |
1093 | if (open_file->closePend) { |
1094 | FreeXid(xid); | |
1095 | if (total_written) | |
1096 | return total_written; | |
1097 | else | |
1098 | return -EBADF; | |
1099 | } | |
1100 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1101 | /* we could deadlock if we called |
1102 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1103 | reopen_file not to flush data to |
1da177e4 | 1104 | server now */ |
4b18f2a9 | 1105 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1106 | if (rc != 0) |
1107 | break; | |
1108 | } | |
fb8c4b14 SF |
1109 | if (experimEnabled || (pTcon->ses->server && |
1110 | ((pTcon->ses->server->secMode & | |
08775834 | 1111 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1112 | == 0))) { |
3e84469d SF |
1113 | struct kvec iov[2]; |
1114 | unsigned int len; | |
1115 | ||
0ae0efad | 1116 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1117 | write_size - total_written); |
1118 | /* iov[0] is reserved for smb header */ | |
1119 | iov[1].iov_base = (char *)write_data + | |
1120 | total_written; | |
1121 | iov[1].iov_len = len; | |
d6e04ae6 | 1122 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1123 | open_file->netfid, len, |
d6e04ae6 | 1124 | *poffset, &bytes_written, |
3e84469d | 1125 | iov, 1, long_op); |
d6e04ae6 | 1126 | } else |
60808233 SF |
1127 | rc = CIFSSMBWrite(xid, pTcon, |
1128 | open_file->netfid, | |
1129 | min_t(const int, cifs_sb->wsize, | |
1130 | write_size - total_written), | |
1131 | *poffset, &bytes_written, | |
1132 | write_data + total_written, | |
1133 | NULL, long_op); | |
1da177e4 LT |
1134 | } |
1135 | if (rc || (bytes_written == 0)) { | |
1136 | if (total_written) | |
1137 | break; | |
1138 | else { | |
1139 | FreeXid(xid); | |
1140 | return rc; | |
1141 | } | |
fbec9ab9 JL |
1142 | } else { |
1143 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1144 | *poffset += bytes_written; |
fbec9ab9 | 1145 | } |
133672ef | 1146 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1147 | 15 seconds is plenty */ |
1148 | } | |
1149 | ||
a4544347 | 1150 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1151 | |
1152 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1153 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1154 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1155 | /* file->f_path.dentry->d_inode->i_ctime = |
1156 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1157 | if (total_written > 0) { | |
1158 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1159 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1160 | i_size_write(file->f_path.dentry->d_inode, | |
1161 | *poffset); | |
1162 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1163 | } |
3677db10 | 1164 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1165 | } |
1166 | FreeXid(xid); | |
1167 | return total_written; | |
1168 | } | |
1169 | ||
630f3f0c SF |
1170 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1171 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1172 | { | |
1173 | struct cifsFileInfo *open_file = NULL; | |
1174 | ||
1175 | read_lock(&GlobalSMBSeslock); | |
1176 | /* we could simply get the first_list_entry since write-only entries | |
1177 | are always at the end of the list but since the first entry might | |
1178 | have a close pending, we go through the whole list */ | |
1179 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1180 | if (open_file->closePend) | |
1181 | continue; | |
1182 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1183 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1184 | if (!open_file->invalidHandle) { | |
1185 | /* found a good file */ | |
1186 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1187 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1188 | read_unlock(&GlobalSMBSeslock); |
1189 | return open_file; | |
1190 | } /* else might as well continue, and look for | |
1191 | another, or simply have the caller reopen it | |
1192 | again rather than trying to fix this handle */ | |
1193 | } else /* write only file */ | |
1194 | break; /* write only files are last so must be done */ | |
1195 | } | |
1196 | read_unlock(&GlobalSMBSeslock); | |
1197 | return NULL; | |
1198 | } | |
1199 | #endif | |
1200 | ||
dd99cd80 | 1201 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1202 | { |
1203 | struct cifsFileInfo *open_file; | |
2846d386 | 1204 | bool any_available = false; |
dd99cd80 | 1205 | int rc; |
6148a742 | 1206 | |
60808233 SF |
1207 | /* Having a null inode here (because mapping->host was set to zero by |
1208 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1209 | it being zero) during stress testcases so we need to check for it */ | |
1210 | ||
fb8c4b14 | 1211 | if (cifs_inode == NULL) { |
b6b38f70 | 1212 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1213 | dump_stack(); |
1214 | return NULL; | |
1215 | } | |
1216 | ||
6148a742 | 1217 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1218 | refind_writable: |
6148a742 | 1219 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1220 | if (open_file->closePend || |
1221 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1222 | continue; |
2846d386 | 1223 | |
6148a742 SF |
1224 | if (open_file->pfile && |
1225 | ((open_file->pfile->f_flags & O_RDWR) || | |
1226 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1227 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1228 | |
1229 | if (!open_file->invalidHandle) { | |
1230 | /* found a good writable file */ | |
1231 | read_unlock(&GlobalSMBSeslock); | |
1232 | return open_file; | |
1233 | } | |
8840dee9 | 1234 | |
6148a742 | 1235 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1236 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1237 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1238 | if (!rc) { |
9b22b0b7 SF |
1239 | if (!open_file->closePend) |
1240 | return open_file; | |
1241 | else { /* start over in case this was deleted */ | |
1242 | /* since the list could be modified */ | |
37c0eb46 | 1243 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1244 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1245 | goto refind_writable; |
37c0eb46 SF |
1246 | } |
1247 | } | |
9b22b0b7 SF |
1248 | |
1249 | /* if it fails, try another handle if possible - | |
1250 | (we can not do this if closePending since | |
1251 | loop could be modified - in which case we | |
1252 | have to start at the beginning of the list | |
1253 | again. Note that it would be bad | |
1254 | to hold up writepages here (rather than | |
1255 | in caller) with continuous retries */ | |
b6b38f70 | 1256 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1257 | read_lock(&GlobalSMBSeslock); |
1258 | /* can not use this handle, no write | |
1259 | pending on this one after all */ | |
6ab409b5 | 1260 | cifsFileInfo_put(open_file); |
8840dee9 | 1261 | |
9b22b0b7 SF |
1262 | if (open_file->closePend) /* list could have changed */ |
1263 | goto refind_writable; | |
1264 | /* else we simply continue to the next entry. Thus | |
1265 | we do not loop on reopen errors. If we | |
1266 | can not reopen the file, for example if we | |
1267 | reconnected to a server with another client | |
1268 | racing to delete or lock the file we would not | |
1269 | make progress if we restarted before the beginning | |
1270 | of the loop here. */ | |
6148a742 SF |
1271 | } |
1272 | } | |
2846d386 JL |
1273 | /* couldn't find useable FH with same pid, try any available */ |
1274 | if (!any_available) { | |
1275 | any_available = true; | |
1276 | goto refind_writable; | |
1277 | } | |
6148a742 SF |
1278 | read_unlock(&GlobalSMBSeslock); |
1279 | return NULL; | |
1280 | } | |
1281 | ||
1da177e4 LT |
1282 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1283 | { | |
1284 | struct address_space *mapping = page->mapping; | |
1285 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1286 | char *write_data; | |
1287 | int rc = -EFAULT; | |
1288 | int bytes_written = 0; | |
1289 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1290 | struct inode *inode; |
6148a742 | 1291 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1292 | |
1293 | if (!mapping || !mapping->host) | |
1294 | return -EFAULT; | |
1295 | ||
1296 | inode = page->mapping->host; | |
1297 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1298 | |
1299 | offset += (loff_t)from; | |
1300 | write_data = kmap(page); | |
1301 | write_data += from; | |
1302 | ||
1303 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1304 | kunmap(page); | |
1305 | return -EIO; | |
1306 | } | |
1307 | ||
1308 | /* racing with truncate? */ | |
1309 | if (offset > mapping->host->i_size) { | |
1310 | kunmap(page); | |
1311 | return 0; /* don't care */ | |
1312 | } | |
1313 | ||
1314 | /* check to make sure that we are not extending the file */ | |
1315 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1316 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1317 | |
6148a742 SF |
1318 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1319 | if (open_file) { | |
1320 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1321 | to-from, &offset); | |
6ab409b5 | 1322 | cifsFileInfo_put(open_file); |
1da177e4 | 1323 | /* Does mm or vfs already set times? */ |
6148a742 | 1324 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1325 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1326 | rc = 0; |
bb5a9a04 SF |
1327 | else if (bytes_written < 0) |
1328 | rc = bytes_written; | |
6148a742 | 1329 | } else { |
b6b38f70 | 1330 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1331 | rc = -EIO; |
1332 | } | |
1333 | ||
1334 | kunmap(page); | |
1335 | return rc; | |
1336 | } | |
1337 | ||
1da177e4 | 1338 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1339 | struct writeback_control *wbc) |
1da177e4 | 1340 | { |
37c0eb46 SF |
1341 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1342 | unsigned int bytes_to_write; | |
1343 | unsigned int bytes_written; | |
1344 | struct cifs_sb_info *cifs_sb; | |
1345 | int done = 0; | |
111ebb6e | 1346 | pgoff_t end; |
37c0eb46 | 1347 | pgoff_t index; |
fb8c4b14 SF |
1348 | int range_whole = 0; |
1349 | struct kvec *iov; | |
84d2f07e | 1350 | int len; |
37c0eb46 SF |
1351 | int n_iov = 0; |
1352 | pgoff_t next; | |
1353 | int nr_pages; | |
1354 | __u64 offset = 0; | |
23e7dd7d | 1355 | struct cifsFileInfo *open_file; |
ba00ba64 | 1356 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1357 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1358 | struct page *page; |
1359 | struct pagevec pvec; | |
1360 | int rc = 0; | |
1361 | int scanned = 0; | |
fbec9ab9 | 1362 | int xid, long_op; |
1da177e4 | 1363 | |
f3983c21 JL |
1364 | /* |
1365 | * BB: Is this meaningful for a non-block-device file system? | |
1366 | * If it is, we should test it again after we do I/O | |
1367 | */ | |
1368 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1369 | wbc->encountered_congestion = 1; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
37c0eb46 | 1373 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1374 | |
37c0eb46 SF |
1375 | /* |
1376 | * If wsize is smaller that the page cache size, default to writing | |
1377 | * one page at a time via cifs_writepage | |
1378 | */ | |
1379 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1380 | return generic_writepages(mapping, wbc); | |
1381 | ||
9a0c8230 | 1382 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1383 | if (iov == NULL) |
9a0c8230 SF |
1384 | return generic_writepages(mapping, wbc); |
1385 | ||
37c0eb46 | 1386 | /* |
f3983c21 JL |
1387 | * if there's no open file, then this is likely to fail too, |
1388 | * but it'll at least handle the return. Maybe it should be | |
1389 | * a BUG() instead? | |
37c0eb46 | 1390 | */ |
f3983c21 JL |
1391 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1392 | if (!open_file) { | |
9a0c8230 | 1393 | kfree(iov); |
f3983c21 JL |
1394 | return generic_writepages(mapping, wbc); |
1395 | } | |
1396 | ||
13cfb733 | 1397 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1398 | if (!experimEnabled && tcon->ses->server->secMode & |
1399 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1400 | cifsFileInfo_put(open_file); | |
1401 | return generic_writepages(mapping, wbc); | |
37c0eb46 | 1402 | } |
f3983c21 | 1403 | cifsFileInfo_put(open_file); |
37c0eb46 | 1404 | |
1da177e4 LT |
1405 | xid = GetXid(); |
1406 | ||
37c0eb46 | 1407 | pagevec_init(&pvec, 0); |
111ebb6e | 1408 | if (wbc->range_cyclic) { |
37c0eb46 | 1409 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1410 | end = -1; |
1411 | } else { | |
1412 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1413 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1414 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1415 | range_whole = 1; | |
37c0eb46 SF |
1416 | scanned = 1; |
1417 | } | |
1418 | retry: | |
1419 | while (!done && (index <= end) && | |
1420 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1421 | PAGECACHE_TAG_DIRTY, | |
1422 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1423 | int first; | |
1424 | unsigned int i; | |
1425 | ||
37c0eb46 SF |
1426 | first = -1; |
1427 | next = 0; | |
1428 | n_iov = 0; | |
1429 | bytes_to_write = 0; | |
1430 | ||
1431 | for (i = 0; i < nr_pages; i++) { | |
1432 | page = pvec.pages[i]; | |
1433 | /* | |
1434 | * At this point we hold neither mapping->tree_lock nor | |
1435 | * lock on the page itself: the page may be truncated or | |
1436 | * invalidated (changing page->mapping to NULL), or even | |
1437 | * swizzled back from swapper_space to tmpfs file | |
1438 | * mapping | |
1439 | */ | |
1440 | ||
1441 | if (first < 0) | |
1442 | lock_page(page); | |
529ae9aa | 1443 | else if (!trylock_page(page)) |
37c0eb46 SF |
1444 | break; |
1445 | ||
1446 | if (unlikely(page->mapping != mapping)) { | |
1447 | unlock_page(page); | |
1448 | break; | |
1449 | } | |
1450 | ||
111ebb6e | 1451 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1452 | done = 1; |
1453 | unlock_page(page); | |
1454 | break; | |
1455 | } | |
1456 | ||
1457 | if (next && (page->index != next)) { | |
1458 | /* Not next consecutive page */ | |
1459 | unlock_page(page); | |
1460 | break; | |
1461 | } | |
1462 | ||
1463 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1464 | wait_on_page_writeback(page); | |
1465 | ||
1466 | if (PageWriteback(page) || | |
cb876f45 | 1467 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1468 | unlock_page(page); |
1469 | break; | |
1470 | } | |
84d2f07e | 1471 | |
cb876f45 LT |
1472 | /* |
1473 | * This actually clears the dirty bit in the radix tree. | |
1474 | * See cifs_writepage() for more commentary. | |
1475 | */ | |
1476 | set_page_writeback(page); | |
1477 | ||
84d2f07e SF |
1478 | if (page_offset(page) >= mapping->host->i_size) { |
1479 | done = 1; | |
1480 | unlock_page(page); | |
cb876f45 | 1481 | end_page_writeback(page); |
84d2f07e SF |
1482 | break; |
1483 | } | |
1484 | ||
37c0eb46 SF |
1485 | /* |
1486 | * BB can we get rid of this? pages are held by pvec | |
1487 | */ | |
1488 | page_cache_get(page); | |
1489 | ||
84d2f07e SF |
1490 | len = min(mapping->host->i_size - page_offset(page), |
1491 | (loff_t)PAGE_CACHE_SIZE); | |
1492 | ||
37c0eb46 SF |
1493 | /* reserve iov[0] for the smb header */ |
1494 | n_iov++; | |
1495 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1496 | iov[n_iov].iov_len = len; |
1497 | bytes_to_write += len; | |
37c0eb46 SF |
1498 | |
1499 | if (first < 0) { | |
1500 | first = i; | |
1501 | offset = page_offset(page); | |
1502 | } | |
1503 | next = page->index + 1; | |
1504 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1505 | break; | |
1506 | } | |
1507 | if (n_iov) { | |
23e7dd7d SF |
1508 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1509 | if (!open_file) { | |
b6b38f70 | 1510 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1511 | rc = -EBADF; |
1047abc1 | 1512 | } else { |
fbec9ab9 | 1513 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1514 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1515 | bytes_to_write, offset, |
1516 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1517 | long_op); |
6ab409b5 | 1518 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1519 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1520 | } |
fbec9ab9 | 1521 | |
f3983c21 JL |
1522 | if (rc || bytes_written < bytes_to_write) { |
1523 | cERROR(1, "Write2 ret %d, wrote %d", | |
1524 | rc, bytes_written); | |
1525 | /* BB what if continued retry is | |
1526 | requested via mount flags? */ | |
1527 | if (rc == -ENOSPC) | |
1528 | set_bit(AS_ENOSPC, &mapping->flags); | |
1529 | else | |
1530 | set_bit(AS_EIO, &mapping->flags); | |
1531 | } else { | |
1532 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1533 | } |
f3983c21 | 1534 | |
37c0eb46 SF |
1535 | for (i = 0; i < n_iov; i++) { |
1536 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1537 | /* Should we also set page error on |
1538 | success rc but too little data written? */ | |
1539 | /* BB investigate retry logic on temporary | |
1540 | server crash cases and how recovery works | |
fb8c4b14 SF |
1541 | when page marked as error */ |
1542 | if (rc) | |
eb9bdaa3 | 1543 | SetPageError(page); |
37c0eb46 SF |
1544 | kunmap(page); |
1545 | unlock_page(page); | |
cb876f45 | 1546 | end_page_writeback(page); |
37c0eb46 SF |
1547 | page_cache_release(page); |
1548 | } | |
1549 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1550 | done = 1; | |
1551 | index = next; | |
b066a48c DK |
1552 | } else |
1553 | /* Need to re-find the pages we skipped */ | |
1554 | index = pvec.pages[0]->index + 1; | |
1555 | ||
37c0eb46 SF |
1556 | pagevec_release(&pvec); |
1557 | } | |
1558 | if (!scanned && !done) { | |
1559 | /* | |
1560 | * We hit the last page and there is more work to be done: wrap | |
1561 | * back to the start of the file | |
1562 | */ | |
1563 | scanned = 1; | |
1564 | index = 0; | |
1565 | goto retry; | |
1566 | } | |
111ebb6e | 1567 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1568 | mapping->writeback_index = index; |
1569 | ||
1da177e4 | 1570 | FreeXid(xid); |
9a0c8230 | 1571 | kfree(iov); |
1da177e4 LT |
1572 | return rc; |
1573 | } | |
1da177e4 | 1574 | |
fb8c4b14 | 1575 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1576 | { |
1577 | int rc = -EFAULT; | |
1578 | int xid; | |
1579 | ||
1580 | xid = GetXid(); | |
1581 | /* BB add check for wbc flags */ | |
1582 | page_cache_get(page); | |
ad7a2926 | 1583 | if (!PageUptodate(page)) |
b6b38f70 | 1584 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1585 | |
1586 | /* | |
1587 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1588 | * | |
1589 | * A writepage() implementation always needs to do either this, | |
1590 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1591 | * the case of a failure. | |
1592 | * | |
1593 | * Just unlocking the page will cause the radix tree tag-bits | |
1594 | * to fail to update with the state of the page correctly. | |
1595 | */ | |
fb8c4b14 | 1596 | set_page_writeback(page); |
1da177e4 LT |
1597 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1598 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1599 | unlock_page(page); | |
cb876f45 LT |
1600 | end_page_writeback(page); |
1601 | page_cache_release(page); | |
1da177e4 LT |
1602 | FreeXid(xid); |
1603 | return rc; | |
1604 | } | |
1605 | ||
d9414774 NP |
1606 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1607 | loff_t pos, unsigned len, unsigned copied, | |
1608 | struct page *page, void *fsdata) | |
1da177e4 | 1609 | { |
d9414774 NP |
1610 | int rc; |
1611 | struct inode *inode = mapping->host; | |
1da177e4 | 1612 | |
b6b38f70 JP |
1613 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1614 | page, pos, copied); | |
d9414774 | 1615 | |
a98ee8c1 JL |
1616 | if (PageChecked(page)) { |
1617 | if (copied == len) | |
1618 | SetPageUptodate(page); | |
1619 | ClearPageChecked(page); | |
1620 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1621 | SetPageUptodate(page); |
ad7a2926 | 1622 | |
1da177e4 | 1623 | if (!PageUptodate(page)) { |
d9414774 NP |
1624 | char *page_data; |
1625 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1626 | int xid; | |
1627 | ||
1628 | xid = GetXid(); | |
1da177e4 LT |
1629 | /* this is probably better than directly calling |
1630 | partialpage_write since in this function the file handle is | |
1631 | known which we might as well leverage */ | |
1632 | /* BB check if anything else missing out of ppw | |
1633 | such as updating last write time */ | |
1634 | page_data = kmap(page); | |
d9414774 NP |
1635 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1636 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1637 | kunmap(page); |
d9414774 NP |
1638 | |
1639 | FreeXid(xid); | |
fb8c4b14 | 1640 | } else { |
d9414774 NP |
1641 | rc = copied; |
1642 | pos += copied; | |
1da177e4 LT |
1643 | set_page_dirty(page); |
1644 | } | |
1645 | ||
d9414774 NP |
1646 | if (rc > 0) { |
1647 | spin_lock(&inode->i_lock); | |
1648 | if (pos > inode->i_size) | |
1649 | i_size_write(inode, pos); | |
1650 | spin_unlock(&inode->i_lock); | |
1651 | } | |
1652 | ||
1653 | unlock_page(page); | |
1654 | page_cache_release(page); | |
1655 | ||
1da177e4 LT |
1656 | return rc; |
1657 | } | |
1658 | ||
7ea80859 | 1659 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1660 | { |
1661 | int xid; | |
1662 | int rc = 0; | |
b298f223 | 1663 | struct cifsTconInfo *tcon; |
c21dfb69 | 1664 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1665 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1666 | |
1667 | xid = GetXid(); | |
1668 | ||
b6b38f70 | 1669 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1670 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1671 | |
cea21805 JL |
1672 | rc = filemap_write_and_wait(inode->i_mapping); |
1673 | if (rc == 0) { | |
1674 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1675 | CIFS_I(inode)->write_behind_rc = 0; |
13cfb733 | 1676 | tcon = tlink_tcon(smbfile->tlink); |
be652445 | 1677 | if (!rc && tcon && smbfile && |
4717bed6 | 1678 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1679 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1680 | } |
b298f223 | 1681 | |
1da177e4 LT |
1682 | FreeXid(xid); |
1683 | return rc; | |
1684 | } | |
1685 | ||
3978d717 | 1686 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1687 | { |
1688 | struct address_space *mapping; | |
1689 | struct inode *inode; | |
1690 | unsigned long index = page->index; | |
1691 | unsigned int rpages = 0; | |
1692 | int rc = 0; | |
1693 | ||
f19159dc | 1694 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1695 | mapping = page->mapping; |
1696 | if (!mapping) | |
1697 | return 0; | |
1698 | inode = mapping->host; | |
1699 | if (!inode) | |
3978d717 | 1700 | return; */ |
1da177e4 | 1701 | |
fb8c4b14 | 1702 | /* fill in rpages then |
1da177e4 LT |
1703 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1704 | ||
b6b38f70 | 1705 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1706 | |
3978d717 | 1707 | #if 0 |
1da177e4 LT |
1708 | if (rc < 0) |
1709 | return rc; | |
1710 | return 0; | |
3978d717 | 1711 | #endif |
1da177e4 LT |
1712 | } */ |
1713 | ||
1714 | /* | |
1715 | * As file closes, flush all cached write data for this inode checking | |
1716 | * for write behind errors. | |
1717 | */ | |
75e1fcc0 | 1718 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1719 | { |
fb8c4b14 | 1720 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1721 | int rc = 0; |
1722 | ||
1723 | /* Rather than do the steps manually: | |
1724 | lock the inode for writing | |
1725 | loop through pages looking for write behind data (dirty pages) | |
1726 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1727 | send to server (prefer in parallel) | |
1728 | deal with writebehind errors | |
1729 | unlock inode for writing | |
1730 | filemapfdatawrite appears easier for the time being */ | |
1731 | ||
1732 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1733 | /* reset wb rc if we were able to write out dirty pages */ |
1734 | if (!rc) { | |
1735 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1736 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1737 | } |
50c2f753 | 1738 | |
b6b38f70 | 1739 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1740 | |
1741 | return rc; | |
1742 | } | |
1743 | ||
1744 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1745 | size_t read_size, loff_t *poffset) | |
1746 | { | |
1747 | int rc = -EACCES; | |
1748 | unsigned int bytes_read = 0; | |
1749 | unsigned int total_read = 0; | |
1750 | unsigned int current_read_size; | |
1751 | struct cifs_sb_info *cifs_sb; | |
1752 | struct cifsTconInfo *pTcon; | |
1753 | int xid; | |
1754 | struct cifsFileInfo *open_file; | |
1755 | char *smb_read_data; | |
1756 | char __user *current_offset; | |
1757 | struct smb_com_read_rsp *pSMBr; | |
1758 | ||
1759 | xid = GetXid(); | |
e6a00296 | 1760 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1761 | |
1762 | if (file->private_data == NULL) { | |
0f3bc09e | 1763 | rc = -EBADF; |
1da177e4 | 1764 | FreeXid(xid); |
0f3bc09e | 1765 | return rc; |
1da177e4 | 1766 | } |
c21dfb69 | 1767 | open_file = file->private_data; |
13cfb733 | 1768 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1769 | |
ad7a2926 | 1770 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1771 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1772 | |
1da177e4 LT |
1773 | for (total_read = 0, current_offset = read_data; |
1774 | read_size > total_read; | |
1775 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1776 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1777 | cifs_sb->rsize); |
1778 | rc = -EAGAIN; | |
1779 | smb_read_data = NULL; | |
1780 | while (rc == -EAGAIN) { | |
ec637e3f | 1781 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1782 | if ((open_file->invalidHandle) && |
1da177e4 | 1783 | (!open_file->closePend)) { |
4b18f2a9 | 1784 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1785 | if (rc != 0) |
1786 | break; | |
1787 | } | |
bfa0d75a | 1788 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1789 | open_file->netfid, |
1790 | current_read_size, *poffset, | |
1791 | &bytes_read, &smb_read_data, | |
1792 | &buf_type); | |
1da177e4 | 1793 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1794 | if (smb_read_data) { |
93544cc6 SF |
1795 | if (copy_to_user(current_offset, |
1796 | smb_read_data + | |
1797 | 4 /* RFC1001 length field */ + | |
1798 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1799 | bytes_read)) |
93544cc6 | 1800 | rc = -EFAULT; |
93544cc6 | 1801 | |
fb8c4b14 | 1802 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1803 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1804 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1805 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1806 | smb_read_data = NULL; |
1807 | } | |
1808 | } | |
1809 | if (rc || (bytes_read == 0)) { | |
1810 | if (total_read) { | |
1811 | break; | |
1812 | } else { | |
1813 | FreeXid(xid); | |
1814 | return rc; | |
1815 | } | |
1816 | } else { | |
a4544347 | 1817 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1818 | *poffset += bytes_read; |
1819 | } | |
1820 | } | |
1821 | FreeXid(xid); | |
1822 | return total_read; | |
1823 | } | |
1824 | ||
1825 | ||
1826 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1827 | loff_t *poffset) | |
1828 | { | |
1829 | int rc = -EACCES; | |
1830 | unsigned int bytes_read = 0; | |
1831 | unsigned int total_read; | |
1832 | unsigned int current_read_size; | |
1833 | struct cifs_sb_info *cifs_sb; | |
1834 | struct cifsTconInfo *pTcon; | |
1835 | int xid; | |
1836 | char *current_offset; | |
1837 | struct cifsFileInfo *open_file; | |
ec637e3f | 1838 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1839 | |
1840 | xid = GetXid(); | |
e6a00296 | 1841 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1842 | |
1843 | if (file->private_data == NULL) { | |
0f3bc09e | 1844 | rc = -EBADF; |
1da177e4 | 1845 | FreeXid(xid); |
0f3bc09e | 1846 | return rc; |
1da177e4 | 1847 | } |
c21dfb69 | 1848 | open_file = file->private_data; |
13cfb733 | 1849 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1850 | |
1851 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1852 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1853 | |
fb8c4b14 | 1854 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1855 | read_size > total_read; |
1856 | total_read += bytes_read, current_offset += bytes_read) { | |
1857 | current_read_size = min_t(const int, read_size - total_read, | |
1858 | cifs_sb->rsize); | |
f9f5c817 SF |
1859 | /* For windows me and 9x we do not want to request more |
1860 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1861 | if ((pTcon->ses) && |
f9f5c817 SF |
1862 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1863 | current_read_size = min_t(const int, current_read_size, | |
1864 | pTcon->ses->server->maxBuf - 128); | |
1865 | } | |
1da177e4 LT |
1866 | rc = -EAGAIN; |
1867 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1868 | if ((open_file->invalidHandle) && |
1da177e4 | 1869 | (!open_file->closePend)) { |
4b18f2a9 | 1870 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1871 | if (rc != 0) |
1872 | break; | |
1873 | } | |
bfa0d75a | 1874 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1875 | open_file->netfid, |
1876 | current_read_size, *poffset, | |
1877 | &bytes_read, ¤t_offset, | |
1878 | &buf_type); | |
1da177e4 LT |
1879 | } |
1880 | if (rc || (bytes_read == 0)) { | |
1881 | if (total_read) { | |
1882 | break; | |
1883 | } else { | |
1884 | FreeXid(xid); | |
1885 | return rc; | |
1886 | } | |
1887 | } else { | |
a4544347 | 1888 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1889 | *poffset += bytes_read; |
1890 | } | |
1891 | } | |
1892 | FreeXid(xid); | |
1893 | return total_read; | |
1894 | } | |
1895 | ||
1896 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1897 | { | |
1da177e4 LT |
1898 | int rc, xid; |
1899 | ||
1900 | xid = GetXid(); | |
abab095d | 1901 | rc = cifs_revalidate_file(file); |
1da177e4 | 1902 | if (rc) { |
b6b38f70 | 1903 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1904 | FreeXid(xid); |
1905 | return rc; | |
1906 | } | |
1907 | rc = generic_file_mmap(file, vma); | |
1908 | FreeXid(xid); | |
1909 | return rc; | |
1910 | } | |
1911 | ||
1912 | ||
fb8c4b14 | 1913 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1914 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1915 | { |
1916 | struct page *page; | |
1917 | char *target; | |
1918 | ||
1919 | while (bytes_read > 0) { | |
1920 | if (list_empty(pages)) | |
1921 | break; | |
1922 | ||
1923 | page = list_entry(pages->prev, struct page, lru); | |
1924 | list_del(&page->lru); | |
1925 | ||
315e995c | 1926 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1927 | GFP_KERNEL)) { |
1928 | page_cache_release(page); | |
b6b38f70 | 1929 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1930 | data += PAGE_CACHE_SIZE; |
1931 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1932 | continue; |
1933 | } | |
06b43672 | 1934 | page_cache_release(page); |
1da177e4 | 1935 | |
fb8c4b14 | 1936 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1937 | |
1938 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1939 | memcpy(target, data, bytes_read); | |
1940 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1941 | memset(target + bytes_read, 0, |
1da177e4 LT |
1942 | PAGE_CACHE_SIZE - bytes_read); |
1943 | bytes_read = 0; | |
1944 | } else { | |
1945 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1946 | bytes_read -= PAGE_CACHE_SIZE; | |
1947 | } | |
1948 | kunmap_atomic(target, KM_USER0); | |
1949 | ||
1950 | flush_dcache_page(page); | |
1951 | SetPageUptodate(page); | |
1952 | unlock_page(page); | |
1da177e4 | 1953 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1954 | |
1955 | /* add page to FS-Cache */ | |
1956 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1957 | } |
1958 | return; | |
1959 | } | |
1960 | ||
1961 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1962 | struct list_head *page_list, unsigned num_pages) | |
1963 | { | |
1964 | int rc = -EACCES; | |
1965 | int xid; | |
1966 | loff_t offset; | |
1967 | struct page *page; | |
1968 | struct cifs_sb_info *cifs_sb; | |
1969 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1970 | unsigned int bytes_read = 0; |
fb8c4b14 | 1971 | unsigned int read_size, i; |
1da177e4 LT |
1972 | char *smb_read_data = NULL; |
1973 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1974 | struct cifsFileInfo *open_file; |
ec637e3f | 1975 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1976 | |
1977 | xid = GetXid(); | |
1978 | if (file->private_data == NULL) { | |
0f3bc09e | 1979 | rc = -EBADF; |
1da177e4 | 1980 | FreeXid(xid); |
0f3bc09e | 1981 | return rc; |
1da177e4 | 1982 | } |
c21dfb69 | 1983 | open_file = file->private_data; |
e6a00296 | 1984 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1985 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1986 | |
56698236 SJ |
1987 | /* |
1988 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1989 | * immediately if the cookie is negative | |
1990 | */ | |
1991 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1992 | &num_pages); | |
1993 | if (rc == 0) | |
1994 | goto read_complete; | |
1995 | ||
f19159dc | 1996 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1997 | for (i = 0; i < num_pages; ) { |
1998 | unsigned contig_pages; | |
1999 | struct page *tmp_page; | |
2000 | unsigned long expected_index; | |
2001 | ||
2002 | if (list_empty(page_list)) | |
2003 | break; | |
2004 | ||
2005 | page = list_entry(page_list->prev, struct page, lru); | |
2006 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2007 | ||
2008 | /* count adjacent pages that we will read into */ | |
2009 | contig_pages = 0; | |
fb8c4b14 | 2010 | expected_index = |
1da177e4 | 2011 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2012 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2013 | if (tmp_page->index == expected_index) { |
2014 | contig_pages++; | |
2015 | expected_index++; | |
2016 | } else | |
fb8c4b14 | 2017 | break; |
1da177e4 LT |
2018 | } |
2019 | if (contig_pages + i > num_pages) | |
2020 | contig_pages = num_pages - i; | |
2021 | ||
2022 | /* for reads over a certain size could initiate async | |
2023 | read ahead */ | |
2024 | ||
2025 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2026 | /* Read size needs to be in multiples of one page */ | |
2027 | read_size = min_t(const unsigned int, read_size, | |
2028 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2029 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2030 | read_size, contig_pages); | |
1da177e4 LT |
2031 | rc = -EAGAIN; |
2032 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2033 | if ((open_file->invalidHandle) && |
1da177e4 | 2034 | (!open_file->closePend)) { |
4b18f2a9 | 2035 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2036 | if (rc != 0) |
2037 | break; | |
2038 | } | |
2039 | ||
bfa0d75a | 2040 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2041 | open_file->netfid, |
2042 | read_size, offset, | |
2043 | &bytes_read, &smb_read_data, | |
2044 | &buf_type); | |
a9d02ad4 | 2045 | /* BB more RC checks ? */ |
fb8c4b14 | 2046 | if (rc == -EAGAIN) { |
1da177e4 | 2047 | if (smb_read_data) { |
fb8c4b14 | 2048 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2049 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2050 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2051 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2052 | smb_read_data = NULL; |
2053 | } | |
2054 | } | |
2055 | } | |
2056 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2057 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2058 | break; |
2059 | } else if (bytes_read > 0) { | |
6f88cc2e | 2060 | task_io_account_read(bytes_read); |
1da177e4 LT |
2061 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2062 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2063 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2064 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2065 | |
2066 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2067 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2068 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2069 | i++; /* account for partial page */ |
2070 | ||
fb8c4b14 | 2071 | /* server copy of file can have smaller size |
1da177e4 | 2072 | than client */ |
fb8c4b14 SF |
2073 | /* BB do we need to verify this common case ? |
2074 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2075 | we will hit it on next read */ |
2076 | ||
05ac9d4b | 2077 | /* break; */ |
1da177e4 LT |
2078 | } |
2079 | } else { | |
b6b38f70 | 2080 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2081 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2082 | bytes_read, offset); |
fb8c4b14 | 2083 | /* BB turn off caching and do new lookup on |
1da177e4 | 2084 | file size at server? */ |
1da177e4 LT |
2085 | break; |
2086 | } | |
2087 | if (smb_read_data) { | |
fb8c4b14 | 2088 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2089 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2090 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2091 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2092 | smb_read_data = NULL; |
2093 | } | |
2094 | bytes_read = 0; | |
2095 | } | |
2096 | ||
1da177e4 LT |
2097 | /* need to free smb_read_data buf before exit */ |
2098 | if (smb_read_data) { | |
fb8c4b14 | 2099 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2100 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2101 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2102 | cifs_buf_release(smb_read_data); |
1da177e4 | 2103 | smb_read_data = NULL; |
fb8c4b14 | 2104 | } |
1da177e4 | 2105 | |
56698236 | 2106 | read_complete: |
1da177e4 LT |
2107 | FreeXid(xid); |
2108 | return rc; | |
2109 | } | |
2110 | ||
2111 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2112 | loff_t *poffset) | |
2113 | { | |
2114 | char *read_data; | |
2115 | int rc; | |
2116 | ||
56698236 SJ |
2117 | /* Is the page cached? */ |
2118 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2119 | if (rc == 0) | |
2120 | goto read_complete; | |
2121 | ||
1da177e4 LT |
2122 | page_cache_get(page); |
2123 | read_data = kmap(page); | |
2124 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2125 | |
1da177e4 | 2126 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2127 | |
1da177e4 LT |
2128 | if (rc < 0) |
2129 | goto io_error; | |
2130 | else | |
b6b38f70 | 2131 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2132 | |
e6a00296 JJS |
2133 | file->f_path.dentry->d_inode->i_atime = |
2134 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2135 | |
1da177e4 LT |
2136 | if (PAGE_CACHE_SIZE > rc) |
2137 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2138 | ||
2139 | flush_dcache_page(page); | |
2140 | SetPageUptodate(page); | |
9dc06558 SJ |
2141 | |
2142 | /* send this page to the cache */ | |
2143 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2144 | ||
1da177e4 | 2145 | rc = 0; |
fb8c4b14 | 2146 | |
1da177e4 | 2147 | io_error: |
fb8c4b14 | 2148 | kunmap(page); |
1da177e4 | 2149 | page_cache_release(page); |
56698236 SJ |
2150 | |
2151 | read_complete: | |
1da177e4 LT |
2152 | return rc; |
2153 | } | |
2154 | ||
2155 | static int cifs_readpage(struct file *file, struct page *page) | |
2156 | { | |
2157 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2158 | int rc = -EACCES; | |
2159 | int xid; | |
2160 | ||
2161 | xid = GetXid(); | |
2162 | ||
2163 | if (file->private_data == NULL) { | |
0f3bc09e | 2164 | rc = -EBADF; |
1da177e4 | 2165 | FreeXid(xid); |
0f3bc09e | 2166 | return rc; |
1da177e4 LT |
2167 | } |
2168 | ||
b6b38f70 JP |
2169 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2170 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2171 | |
2172 | rc = cifs_readpage_worker(file, page, &offset); | |
2173 | ||
2174 | unlock_page(page); | |
2175 | ||
2176 | FreeXid(xid); | |
2177 | return rc; | |
2178 | } | |
2179 | ||
a403a0a3 SF |
2180 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2181 | { | |
2182 | struct cifsFileInfo *open_file; | |
2183 | ||
2184 | read_lock(&GlobalSMBSeslock); | |
2185 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2186 | if (open_file->closePend) | |
2187 | continue; | |
2188 | if (open_file->pfile && | |
2189 | ((open_file->pfile->f_flags & O_RDWR) || | |
2190 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2191 | read_unlock(&GlobalSMBSeslock); | |
2192 | return 1; | |
2193 | } | |
2194 | } | |
2195 | read_unlock(&GlobalSMBSeslock); | |
2196 | return 0; | |
2197 | } | |
2198 | ||
1da177e4 LT |
2199 | /* We do not want to update the file size from server for inodes |
2200 | open for write - to avoid races with writepage extending | |
2201 | the file - in the future we could consider allowing | |
fb8c4b14 | 2202 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2203 | but this is tricky to do without racing with writebehind |
2204 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2205 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2206 | { |
a403a0a3 | 2207 | if (!cifsInode) |
4b18f2a9 | 2208 | return true; |
50c2f753 | 2209 | |
a403a0a3 SF |
2210 | if (is_inode_writable(cifsInode)) { |
2211 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2212 | struct cifs_sb_info *cifs_sb; |
2213 | ||
c32a0b68 | 2214 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2215 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2216 | /* since no page cache to corrupt on directio |
c32a0b68 | 2217 | we can change size safely */ |
4b18f2a9 | 2218 | return true; |
c32a0b68 SF |
2219 | } |
2220 | ||
fb8c4b14 | 2221 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2222 | return true; |
7ba52631 | 2223 | |
4b18f2a9 | 2224 | return false; |
23e7dd7d | 2225 | } else |
4b18f2a9 | 2226 | return true; |
1da177e4 LT |
2227 | } |
2228 | ||
d9414774 NP |
2229 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2230 | loff_t pos, unsigned len, unsigned flags, | |
2231 | struct page **pagep, void **fsdata) | |
1da177e4 | 2232 | { |
d9414774 NP |
2233 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2234 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2235 | loff_t page_start = pos & PAGE_MASK; |
2236 | loff_t i_size; | |
2237 | struct page *page; | |
2238 | int rc = 0; | |
d9414774 | 2239 | |
b6b38f70 | 2240 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2241 | |
54566b2c | 2242 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2243 | if (!page) { |
2244 | rc = -ENOMEM; | |
2245 | goto out; | |
2246 | } | |
8a236264 | 2247 | |
a98ee8c1 JL |
2248 | if (PageUptodate(page)) |
2249 | goto out; | |
8a236264 | 2250 | |
a98ee8c1 JL |
2251 | /* |
2252 | * If we write a full page it will be up to date, no need to read from | |
2253 | * the server. If the write is short, we'll end up doing a sync write | |
2254 | * instead. | |
2255 | */ | |
2256 | if (len == PAGE_CACHE_SIZE) | |
2257 | goto out; | |
8a236264 | 2258 | |
a98ee8c1 JL |
2259 | /* |
2260 | * optimize away the read when we have an oplock, and we're not | |
2261 | * expecting to use any of the data we'd be reading in. That | |
2262 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2263 | * and the write will cover all of the existing data. | |
2264 | */ | |
2265 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2266 | i_size = i_size_read(mapping->host); | |
2267 | if (page_start >= i_size || | |
2268 | (offset == 0 && (pos + len) >= i_size)) { | |
2269 | zero_user_segments(page, 0, offset, | |
2270 | offset + len, | |
2271 | PAGE_CACHE_SIZE); | |
2272 | /* | |
2273 | * PageChecked means that the parts of the page | |
2274 | * to which we're not writing are considered up | |
2275 | * to date. Once the data is copied to the | |
2276 | * page, it can be set uptodate. | |
2277 | */ | |
2278 | SetPageChecked(page); | |
2279 | goto out; | |
2280 | } | |
2281 | } | |
d9414774 | 2282 | |
a98ee8c1 JL |
2283 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2284 | /* | |
2285 | * might as well read a page, it is fast enough. If we get | |
2286 | * an error, we don't need to return it. cifs_write_end will | |
2287 | * do a sync write instead since PG_uptodate isn't set. | |
2288 | */ | |
2289 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2290 | } else { |
2291 | /* we could try using another file handle if there is one - | |
2292 | but how would we lock it to prevent close of that handle | |
2293 | racing with this read? In any case | |
d9414774 | 2294 | this will be written out by write_end so is fine */ |
1da177e4 | 2295 | } |
a98ee8c1 JL |
2296 | out: |
2297 | *pagep = page; | |
2298 | return rc; | |
1da177e4 LT |
2299 | } |
2300 | ||
85f2d6b4 SJ |
2301 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2302 | { | |
2303 | if (PagePrivate(page)) | |
2304 | return 0; | |
2305 | ||
2306 | return cifs_fscache_release_page(page, gfp); | |
2307 | } | |
2308 | ||
2309 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2310 | { | |
2311 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2312 | ||
2313 | if (offset == 0) | |
2314 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2315 | } | |
2316 | ||
9b646972 | 2317 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2318 | { |
2319 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2320 | oplock_break); | |
2321 | struct inode *inode = cfile->pInode; | |
2322 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
3bc303c2 JL |
2323 | int rc, waitrc = 0; |
2324 | ||
2325 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2326 | if (cinode->clientCanCacheRead) |
8737c930 | 2327 | break_lease(inode, O_RDONLY); |
d54ff732 | 2328 | else |
8737c930 | 2329 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2330 | rc = filemap_fdatawrite(inode->i_mapping); |
2331 | if (cinode->clientCanCacheRead == 0) { | |
2332 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2333 | invalidate_remote_inode(inode); | |
2334 | } | |
2335 | if (!rc) | |
2336 | rc = waitrc; | |
2337 | if (rc) | |
2338 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2339 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2340 | } |
2341 | ||
2342 | /* | |
2343 | * releasing stale oplock after recent reconnect of smb session using | |
2344 | * a now incorrect file handle is not a data integrity issue but do | |
2345 | * not bother sending an oplock release if session to server still is | |
2346 | * disconnected since oplock already released by the server | |
2347 | */ | |
2348 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
13cfb733 JL |
2349 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2350 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2351 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2352 | } |
9b646972 TH |
2353 | |
2354 | /* | |
2355 | * We might have kicked in before is_valid_oplock_break() | |
2356 | * finished grabbing reference for us. Make sure it's done by | |
2357 | * waiting for GlobalSMSSeslock. | |
2358 | */ | |
2359 | write_lock(&GlobalSMBSeslock); | |
2360 | write_unlock(&GlobalSMBSeslock); | |
2361 | ||
2362 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2363 | } |
2364 | ||
9b646972 | 2365 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2366 | { |
3bc303c2 JL |
2367 | mntget(cfile->mnt); |
2368 | cifsFileInfo_get(cfile); | |
3bc303c2 JL |
2369 | } |
2370 | ||
9b646972 | 2371 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2372 | { |
3bc303c2 JL |
2373 | mntput(cfile->mnt); |
2374 | cifsFileInfo_put(cfile); | |
2375 | } | |
2376 | ||
f5e54d6e | 2377 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2378 | .readpage = cifs_readpage, |
2379 | .readpages = cifs_readpages, | |
2380 | .writepage = cifs_writepage, | |
37c0eb46 | 2381 | .writepages = cifs_writepages, |
d9414774 NP |
2382 | .write_begin = cifs_write_begin, |
2383 | .write_end = cifs_write_end, | |
1da177e4 | 2384 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2385 | .releasepage = cifs_release_page, |
2386 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2387 | /* .sync_page = cifs_sync_page, */ |
2388 | /* .direct_IO = */ | |
2389 | }; | |
273d81d6 DK |
2390 | |
2391 | /* | |
2392 | * cifs_readpages requires the server to support a buffer large enough to | |
2393 | * contain the header plus one complete page of data. Otherwise, we need | |
2394 | * to leave cifs_readpages out of the address space operations. | |
2395 | */ | |
f5e54d6e | 2396 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2397 | .readpage = cifs_readpage, |
2398 | .writepage = cifs_writepage, | |
2399 | .writepages = cifs_writepages, | |
d9414774 NP |
2400 | .write_begin = cifs_write_begin, |
2401 | .write_end = cifs_write_end, | |
273d81d6 | 2402 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2403 | .releasepage = cifs_release_page, |
2404 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2405 | /* .sync_page = cifs_sync_page, */ |
2406 | /* .direct_IO = */ | |
2407 | }; |