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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
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, |
1da177e4 LT |
168 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, |
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 LT |
209 | |
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); |
1da177e4 | 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; |
6ca9f3ba | 227 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 228 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
229 | char *full_path = NULL; |
230 | int desiredAccess; | |
231 | int disposition; | |
232 | __u16 netfid; | |
233 | FILE_ALL_INFO *buf = NULL; | |
234 | ||
235 | xid = GetXid(); | |
236 | ||
237 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 238 | tcon = cifs_sb->tcon; |
1da177e4 | 239 | |
a6ce4932 | 240 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 241 | |
e6a00296 | 242 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 243 | if (full_path == NULL) { |
0f3bc09e | 244 | rc = -ENOMEM; |
1da177e4 | 245 | FreeXid(xid); |
0f3bc09e | 246 | return rc; |
1da177e4 LT |
247 | } |
248 | ||
b6b38f70 JP |
249 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
250 | inode, file->f_flags, full_path); | |
276a74a4 SF |
251 | |
252 | if (oplockEnabled) | |
253 | oplock = REQ_OPLOCK; | |
254 | else | |
255 | oplock = 0; | |
256 | ||
64cc2c63 SF |
257 | if (!tcon->broken_posix_open && tcon->unix_ext && |
258 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
259 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
260 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
261 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
fa588e0c | 262 | oflags |= SMB_O_CREAT; |
276a74a4 | 263 | /* can not refresh inode info since size could be stale */ |
2422f676 | 264 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c SF |
265 | cifs_sb->mnt_file_mode /* ignored */, |
266 | oflags, &oplock, &netfid, xid); | |
276a74a4 | 267 | if (rc == 0) { |
b6b38f70 | 268 | cFYI(1, "posix open succeeded"); |
276a74a4 SF |
269 | /* no need for special case handling of setting mode |
270 | on read only files needed here */ | |
271 | ||
47c78b7f JL |
272 | rc = cifs_posix_open_inode_helper(inode, file, |
273 | pCifsInode, oplock, netfid); | |
274 | if (rc != 0) { | |
275 | CIFSSMBClose(xid, tcon, netfid); | |
276 | goto out; | |
277 | } | |
278 | ||
2422f676 JL |
279 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, |
280 | file->f_path.mnt, | |
281 | oflags); | |
282 | if (pCifsFile == NULL) { | |
283 | CIFSSMBClose(xid, tcon, netfid); | |
284 | rc = -ENOMEM; | |
2422f676 | 285 | } |
9451a9a5 SJ |
286 | |
287 | cifs_fscache_set_inode_cookie(inode, file); | |
288 | ||
276a74a4 | 289 | goto out; |
64cc2c63 SF |
290 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
291 | if (tcon->ses->serverNOS) | |
b6b38f70 | 292 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
293 | " unexpected error on SMB posix open" |
294 | ", disabling posix open support." | |
295 | " Check if server update available.", | |
296 | tcon->ses->serverName, | |
b6b38f70 | 297 | tcon->ses->serverNOS); |
64cc2c63 | 298 | tcon->broken_posix_open = true; |
276a74a4 SF |
299 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
300 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
301 | goto out; | |
64cc2c63 SF |
302 | /* else fallthrough to retry open the old way on network i/o |
303 | or DFS errors */ | |
276a74a4 SF |
304 | } |
305 | ||
1da177e4 LT |
306 | desiredAccess = cifs_convert_flags(file->f_flags); |
307 | ||
308 | /********************************************************************* | |
309 | * open flag mapping table: | |
fb8c4b14 | 310 | * |
1da177e4 | 311 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 312 | * ---------- ---------------- |
1da177e4 LT |
313 | * O_CREAT FILE_OPEN_IF |
314 | * O_CREAT | O_EXCL FILE_CREATE | |
315 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
316 | * O_TRUNC FILE_OVERWRITE | |
317 | * none of the above FILE_OPEN | |
318 | * | |
319 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 320 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
321 | * O_CREAT | O_TRUNC is similar but truncates the existing |
322 | * file rather than creating a new file as FILE_SUPERSEDE does | |
323 | * (which uses the attributes / metadata passed in on open call) | |
324 | *? | |
fb8c4b14 | 325 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
326 | *? and the read write flags match reasonably. O_LARGEFILE |
327 | *? is irrelevant because largefile support is always used | |
328 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
329 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
330 | *********************************************************************/ | |
331 | ||
332 | disposition = cifs_get_disposition(file->f_flags); | |
333 | ||
1da177e4 LT |
334 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
335 | ||
336 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
337 | and calling get_inode_info with returned buf (at least helps | |
338 | non-Unix server case) */ | |
339 | ||
fb8c4b14 SF |
340 | /* BB we can not do this if this is the second open of a file |
341 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
342 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
343 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
344 | if (!buf) { | |
345 | rc = -ENOMEM; | |
346 | goto out; | |
347 | } | |
5bafd765 SF |
348 | |
349 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 350 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 351 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
352 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
353 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
354 | else |
355 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
356 | ||
a9d02ad4 SF |
357 | if (rc == -EIO) { |
358 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 359 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
360 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
361 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
362 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
363 | } | |
1da177e4 | 364 | if (rc) { |
b6b38f70 | 365 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
366 | goto out; |
367 | } | |
3321b791 | 368 | |
47c78b7f JL |
369 | rc = cifs_open_inode_helper(inode, tcon, &oplock, buf, full_path, xid); |
370 | if (rc != 0) | |
371 | goto out; | |
372 | ||
086f68bd JL |
373 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
374 | file->f_flags); | |
6ca9f3ba | 375 | if (pCifsFile == NULL) { |
1da177e4 LT |
376 | rc = -ENOMEM; |
377 | goto out; | |
378 | } | |
1da177e4 | 379 | |
9451a9a5 SJ |
380 | cifs_fscache_set_inode_cookie(inode, file); |
381 | ||
fb8c4b14 | 382 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
383 | /* time to set mode which we can not set earlier due to |
384 | problems creating new read-only files */ | |
276a74a4 | 385 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
386 | struct cifs_unix_set_info_args args = { |
387 | .mode = inode->i_mode, | |
388 | .uid = NO_CHANGE_64, | |
389 | .gid = NO_CHANGE_64, | |
390 | .ctime = NO_CHANGE_64, | |
391 | .atime = NO_CHANGE_64, | |
392 | .mtime = NO_CHANGE_64, | |
393 | .device = 0, | |
394 | }; | |
01ea95e3 JL |
395 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
396 | cifs_sb->local_nls, | |
397 | cifs_sb->mnt_cifs_flags & | |
737b758c | 398 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
399 | } |
400 | } | |
401 | ||
402 | out: | |
403 | kfree(buf); | |
404 | kfree(full_path); | |
405 | FreeXid(xid); | |
406 | return rc; | |
407 | } | |
408 | ||
0418726b | 409 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
410 | /* to server was lost */ |
411 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
412 | { | |
413 | int rc = 0; | |
414 | ||
415 | /* BB list all locks open on this file and relock */ | |
416 | ||
417 | return rc; | |
418 | } | |
419 | ||
4b18f2a9 | 420 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
421 | { |
422 | int rc = -EACCES; | |
590a3fe0 JL |
423 | int xid; |
424 | __u32 oplock; | |
1da177e4 | 425 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 426 | struct cifsTconInfo *tcon; |
1da177e4 LT |
427 | struct cifsFileInfo *pCifsFile; |
428 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 429 | struct inode *inode; |
1da177e4 LT |
430 | char *full_path = NULL; |
431 | int desiredAccess; | |
432 | int disposition = FILE_OPEN; | |
433 | __u16 netfid; | |
434 | ||
ad7a2926 | 435 | if (file->private_data) |
c21dfb69 | 436 | pCifsFile = file->private_data; |
ad7a2926 | 437 | else |
1da177e4 LT |
438 | return -EBADF; |
439 | ||
440 | xid = GetXid(); | |
f0a71eb8 | 441 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 442 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 443 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 444 | rc = 0; |
1da177e4 | 445 | FreeXid(xid); |
0f3bc09e | 446 | return rc; |
1da177e4 LT |
447 | } |
448 | ||
e6a00296 | 449 | if (file->f_path.dentry == NULL) { |
b6b38f70 | 450 | cERROR(1, "no valid name if dentry freed"); |
3a9f462f SF |
451 | dump_stack(); |
452 | rc = -EBADF; | |
453 | goto reopen_error_exit; | |
454 | } | |
455 | ||
456 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 457 | if (inode == NULL) { |
b6b38f70 | 458 | cERROR(1, "inode not valid"); |
3a9f462f SF |
459 | dump_stack(); |
460 | rc = -EBADF; | |
461 | goto reopen_error_exit; | |
1da177e4 | 462 | } |
50c2f753 | 463 | |
1da177e4 | 464 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 465 | tcon = cifs_sb->tcon; |
3a9f462f | 466 | |
1da177e4 LT |
467 | /* can not grab rename sem here because various ops, including |
468 | those that already have the rename sem can end up causing writepage | |
469 | to get called and if the server was down that means we end up here, | |
470 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 471 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 472 | if (full_path == NULL) { |
3a9f462f SF |
473 | rc = -ENOMEM; |
474 | reopen_error_exit: | |
f0a71eb8 | 475 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 476 | FreeXid(xid); |
3a9f462f | 477 | return rc; |
1da177e4 LT |
478 | } |
479 | ||
b6b38f70 JP |
480 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
481 | inode, file->f_flags, full_path); | |
1da177e4 LT |
482 | |
483 | if (oplockEnabled) | |
484 | oplock = REQ_OPLOCK; | |
485 | else | |
4b18f2a9 | 486 | oplock = 0; |
1da177e4 | 487 | |
7fc8f4e9 SF |
488 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
489 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
490 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
491 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
492 | /* can not refresh inode info since size could be stale */ | |
2422f676 | 493 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
494 | cifs_sb->mnt_file_mode /* ignored */, |
495 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 496 | if (rc == 0) { |
b6b38f70 | 497 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
498 | goto reopen_success; |
499 | } | |
500 | /* fallthrough to retry open the old way on errors, especially | |
501 | in the reconnect path it is important to retry hard */ | |
502 | } | |
503 | ||
504 | desiredAccess = cifs_convert_flags(file->f_flags); | |
505 | ||
1da177e4 | 506 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
507 | by SMBOpen and then calling get_inode_info with returned buf |
508 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
509 | and server version of file size can be stale. If we knew for sure |
510 | that inode was not dirty locally we could do this */ | |
511 | ||
7fc8f4e9 | 512 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 513 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 514 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 515 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 516 | if (rc) { |
f0a71eb8 | 517 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
518 | cFYI(1, "cifs_open returned 0x%x", rc); |
519 | cFYI(1, "oplock: %d", oplock); | |
1da177e4 | 520 | } else { |
7fc8f4e9 | 521 | reopen_success: |
1da177e4 | 522 | pCifsFile->netfid = netfid; |
4b18f2a9 | 523 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 524 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
525 | pCifsInode = CIFS_I(inode); |
526 | if (pCifsInode) { | |
527 | if (can_flush) { | |
cea21805 JL |
528 | rc = filemap_write_and_wait(inode->i_mapping); |
529 | if (rc != 0) | |
530 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
531 | /* temporarily disable caching while we |
532 | go to server to get inode info */ | |
4b18f2a9 SF |
533 | pCifsInode->clientCanCacheAll = false; |
534 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 535 | if (tcon->unix_ext) |
1da177e4 LT |
536 | rc = cifs_get_inode_info_unix(&inode, |
537 | full_path, inode->i_sb, xid); | |
538 | else | |
539 | rc = cifs_get_inode_info(&inode, | |
540 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 541 | xid, NULL); |
1da177e4 LT |
542 | } /* else we are writing out data to server already |
543 | and could deadlock if we tried to flush data, and | |
544 | since we do not know if we have data that would | |
545 | invalidate the current end of file on the server | |
546 | we can not go to the server to get the new inod | |
547 | info */ | |
548 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
549 | pCifsInode->clientCanCacheAll = true; |
550 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
551 | cFYI(1, "Exclusive Oplock granted on inode %p", |
552 | file->f_path.dentry->d_inode); | |
1da177e4 | 553 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
554 | pCifsInode->clientCanCacheRead = true; |
555 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 556 | } else { |
4b18f2a9 SF |
557 | pCifsInode->clientCanCacheRead = false; |
558 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
559 | } |
560 | cifs_relock_file(pCifsFile); | |
561 | } | |
562 | } | |
1da177e4 LT |
563 | kfree(full_path); |
564 | FreeXid(xid); | |
565 | return rc; | |
566 | } | |
567 | ||
568 | int cifs_close(struct inode *inode, struct file *file) | |
569 | { | |
570 | int rc = 0; | |
15745320 | 571 | int xid, timeout; |
1da177e4 LT |
572 | struct cifs_sb_info *cifs_sb; |
573 | struct cifsTconInfo *pTcon; | |
c21dfb69 | 574 | struct cifsFileInfo *pSMBFile = file->private_data; |
1da177e4 LT |
575 | |
576 | xid = GetXid(); | |
577 | ||
578 | cifs_sb = CIFS_SB(inode->i_sb); | |
579 | pTcon = cifs_sb->tcon; | |
580 | if (pSMBFile) { | |
7ee1af76 | 581 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 582 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 583 | pSMBFile->closePend = true; |
1da177e4 LT |
584 | if (pTcon) { |
585 | /* no sense reconnecting to close a file that is | |
586 | already closed */ | |
3b795210 | 587 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 588 | write_unlock(&GlobalSMBSeslock); |
15745320 | 589 | timeout = 2; |
6ab409b5 | 590 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 591 | && (timeout <= 2048)) { |
23e7dd7d SF |
592 | /* Give write a better chance to get to |
593 | server ahead of the close. We do not | |
594 | want to add a wait_q here as it would | |
595 | increase the memory utilization as | |
596 | the struct would be in each open file, | |
fb8c4b14 | 597 | but this should give enough time to |
23e7dd7d | 598 | clear the socket */ |
b6b38f70 | 599 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
600 | msleep(timeout); |
601 | timeout *= 4; | |
4891d539 | 602 | } |
ddb4cbfc SF |
603 | if (!pTcon->need_reconnect && |
604 | !pSMBFile->invalidHandle) | |
605 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 606 | pSMBFile->netfid); |
ddb4cbfc SF |
607 | } else |
608 | write_unlock(&GlobalSMBSeslock); | |
609 | } else | |
610 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
611 | |
612 | /* Delete any outstanding lock records. | |
613 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 614 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
615 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
616 | list_del(&li->llist); | |
617 | kfree(li); | |
618 | } | |
796e5661 | 619 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 620 | |
cbe0476f | 621 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
622 | list_del(&pSMBFile->flist); |
623 | list_del(&pSMBFile->tlist); | |
cbe0476f | 624 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 625 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
626 | file->private_data = NULL; |
627 | } else | |
628 | rc = -EBADF; | |
629 | ||
4efa53f0 | 630 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 631 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 632 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
633 | /* if the file is not open we do not know if we can cache info |
634 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
635 | CIFS_I(inode)->clientCanCacheRead = false; |
636 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 637 | } |
4efa53f0 | 638 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 639 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
640 | rc = CIFS_I(inode)->write_behind_rc; |
641 | FreeXid(xid); | |
642 | return rc; | |
643 | } | |
644 | ||
645 | int cifs_closedir(struct inode *inode, struct file *file) | |
646 | { | |
647 | int rc = 0; | |
648 | int xid; | |
c21dfb69 | 649 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
650 | char *ptmp; |
651 | ||
b6b38f70 | 652 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
653 | |
654 | xid = GetXid(); | |
655 | ||
656 | if (pCFileStruct) { | |
657 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
658 | struct cifs_sb_info *cifs_sb = |
659 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
660 | |
661 | pTcon = cifs_sb->tcon; | |
662 | ||
b6b38f70 | 663 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 664 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
665 | if (!pCFileStruct->srch_inf.endOfSearch && |
666 | !pCFileStruct->invalidHandle) { | |
667 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 668 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 669 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
670 | cFYI(1, "Closing uncompleted readdir with rc %d", |
671 | rc); | |
1da177e4 LT |
672 | /* not much we can do if it fails anyway, ignore rc */ |
673 | rc = 0; | |
ddb4cbfc SF |
674 | } else |
675 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
676 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
677 | if (ptmp) { | |
b6b38f70 | 678 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 679 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 680 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
681 | cifs_small_buf_release(ptmp); |
682 | else | |
683 | cifs_buf_release(ptmp); | |
1da177e4 | 684 | } |
1da177e4 LT |
685 | kfree(file->private_data); |
686 | file->private_data = NULL; | |
687 | } | |
688 | /* BB can we lock the filestruct while this is going on? */ | |
689 | FreeXid(xid); | |
690 | return rc; | |
691 | } | |
692 | ||
7ee1af76 JA |
693 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
694 | __u64 offset, __u8 lockType) | |
695 | { | |
fb8c4b14 SF |
696 | struct cifsLockInfo *li = |
697 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
698 | if (li == NULL) |
699 | return -ENOMEM; | |
700 | li->offset = offset; | |
701 | li->length = len; | |
702 | li->type = lockType; | |
796e5661 | 703 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 704 | list_add(&li->llist, &fid->llist); |
796e5661 | 705 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
706 | return 0; |
707 | } | |
708 | ||
1da177e4 LT |
709 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
710 | { | |
711 | int rc, xid; | |
1da177e4 LT |
712 | __u32 numLock = 0; |
713 | __u32 numUnlock = 0; | |
714 | __u64 length; | |
4b18f2a9 | 715 | bool wait_flag = false; |
1da177e4 | 716 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 717 | struct cifsTconInfo *tcon; |
08547b03 SF |
718 | __u16 netfid; |
719 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 720 | bool posix_locking = 0; |
1da177e4 LT |
721 | |
722 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
723 | rc = -EACCES; | |
724 | xid = GetXid(); | |
725 | ||
b6b38f70 | 726 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 727 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 728 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 729 | pfLock->fl_end); |
1da177e4 LT |
730 | |
731 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 732 | cFYI(1, "Posix"); |
1da177e4 | 733 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 734 | cFYI(1, "Flock"); |
1da177e4 | 735 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 736 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 737 | wait_flag = true; |
1da177e4 LT |
738 | } |
739 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
740 | cFYI(1, "Process suspended by mandatory locking - " |
741 | "not implemented yet"); | |
1da177e4 | 742 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 743 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 744 | if (pfLock->fl_flags & |
1da177e4 | 745 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 746 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
747 | |
748 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 749 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
750 | numLock = 1; |
751 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 752 | cFYI(1, "F_UNLCK"); |
1da177e4 | 753 | numUnlock = 1; |
d47d7c1a SF |
754 | /* Check if unlock includes more than |
755 | one lock range */ | |
1da177e4 | 756 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 757 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
758 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
759 | numLock = 1; | |
760 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 761 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
762 | numLock = 1; |
763 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 764 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
765 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
766 | numLock = 1; | |
767 | } else | |
b6b38f70 | 768 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 769 | |
e6a00296 | 770 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 771 | tcon = cifs_sb->tcon; |
1da177e4 LT |
772 | |
773 | if (file->private_data == NULL) { | |
0f3bc09e | 774 | rc = -EBADF; |
1da177e4 | 775 | FreeXid(xid); |
0f3bc09e | 776 | return rc; |
1da177e4 | 777 | } |
08547b03 SF |
778 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
779 | ||
13a6e42a SF |
780 | if ((tcon->ses->capabilities & CAP_UNIX) && |
781 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 782 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 783 | posix_locking = 1; |
08547b03 SF |
784 | /* BB add code here to normalize offset and length to |
785 | account for negative length which we can not accept over the | |
786 | wire */ | |
1da177e4 | 787 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 788 | if (posix_locking) { |
08547b03 | 789 | int posix_lock_type; |
fb8c4b14 | 790 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
791 | posix_lock_type = CIFS_RDLCK; |
792 | else | |
793 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 794 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 795 | length, pfLock, |
08547b03 SF |
796 | posix_lock_type, wait_flag); |
797 | FreeXid(xid); | |
798 | return rc; | |
799 | } | |
800 | ||
801 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 802 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 803 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 804 | if (rc == 0) { |
13a6e42a | 805 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
806 | pfLock->fl_start, 1 /* numUnlock */ , |
807 | 0 /* numLock */ , lockType, | |
808 | 0 /* wait flag */ ); | |
809 | pfLock->fl_type = F_UNLCK; | |
810 | if (rc != 0) | |
b6b38f70 JP |
811 | cERROR(1, "Error unlocking previously locked " |
812 | "range %d during test of lock", rc); | |
1da177e4 LT |
813 | rc = 0; |
814 | ||
815 | } else { | |
816 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
817 | rc = 0; |
818 | ||
819 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
820 | pfLock->fl_type = F_WRLCK; | |
821 | } else { | |
822 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
823 | pfLock->fl_start, 0, 1, | |
824 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
825 | 0 /* wait flag */); | |
826 | if (rc == 0) { | |
827 | rc = CIFSSMBLock(xid, tcon, netfid, | |
828 | length, pfLock->fl_start, 1, 0, | |
829 | lockType | | |
830 | LOCKING_ANDX_SHARED_LOCK, | |
831 | 0 /* wait flag */); | |
832 | pfLock->fl_type = F_RDLCK; | |
833 | if (rc != 0) | |
f19159dc | 834 | cERROR(1, "Error unlocking " |
f05337c6 | 835 | "previously locked range %d " |
f19159dc | 836 | "during test of lock", rc); |
f05337c6 PS |
837 | rc = 0; |
838 | } else { | |
839 | pfLock->fl_type = F_WRLCK; | |
840 | rc = 0; | |
841 | } | |
842 | } | |
1da177e4 LT |
843 | } |
844 | ||
845 | FreeXid(xid); | |
846 | return rc; | |
847 | } | |
7ee1af76 JA |
848 | |
849 | if (!numLock && !numUnlock) { | |
850 | /* if no lock or unlock then nothing | |
851 | to do since we do not know what it is */ | |
852 | FreeXid(xid); | |
853 | return -EOPNOTSUPP; | |
854 | } | |
855 | ||
856 | if (posix_locking) { | |
08547b03 | 857 | int posix_lock_type; |
fb8c4b14 | 858 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
859 | posix_lock_type = CIFS_RDLCK; |
860 | else | |
861 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 862 | |
fb8c4b14 | 863 | if (numUnlock == 1) |
beb84dc8 | 864 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 865 | |
13a6e42a | 866 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 867 | length, pfLock, |
08547b03 | 868 | posix_lock_type, wait_flag); |
7ee1af76 | 869 | } else { |
c21dfb69 | 870 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
871 | |
872 | if (numLock) { | |
13a6e42a | 873 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 874 | pfLock->fl_start, |
7ee1af76 JA |
875 | 0, numLock, lockType, wait_flag); |
876 | ||
877 | if (rc == 0) { | |
878 | /* For Windows locks we must store them. */ | |
879 | rc = store_file_lock(fid, length, | |
880 | pfLock->fl_start, lockType); | |
881 | } | |
882 | } else if (numUnlock) { | |
883 | /* For each stored lock that this unlock overlaps | |
884 | completely, unlock it. */ | |
885 | int stored_rc = 0; | |
886 | struct cifsLockInfo *li, *tmp; | |
887 | ||
6b70c955 | 888 | rc = 0; |
796e5661 | 889 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
890 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
891 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 892 | (pfLock->fl_start + length) >= |
39db810c | 893 | (li->offset + li->length)) { |
13a6e42a | 894 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 895 | netfid, |
7ee1af76 | 896 | li->length, li->offset, |
4b18f2a9 | 897 | 1, 0, li->type, false); |
7ee1af76 JA |
898 | if (stored_rc) |
899 | rc = stored_rc; | |
2c964d1f PS |
900 | else { |
901 | list_del(&li->llist); | |
902 | kfree(li); | |
903 | } | |
7ee1af76 JA |
904 | } |
905 | } | |
796e5661 | 906 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
907 | } |
908 | } | |
909 | ||
d634cc15 | 910 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
911 | posix_lock_file_wait(file, pfLock); |
912 | FreeXid(xid); | |
913 | return rc; | |
914 | } | |
915 | ||
fbec9ab9 JL |
916 | /* |
917 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
918 | * these calls can be very long. | |
919 | * | |
920 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
921 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
922 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
923 | * welcome if someone wants to suggest one. | |
924 | * | |
925 | * We may be able to do a better job with this if there were some way to | |
926 | * declare that a file should be sparse. | |
927 | */ | |
928 | static int | |
929 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
930 | { | |
931 | if (offset <= cifsi->server_eof) | |
932 | return CIFS_STD_OP; | |
933 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
934 | return CIFS_VLONG_OP; | |
935 | else | |
936 | return CIFS_LONG_OP; | |
937 | } | |
938 | ||
939 | /* update the file size (if needed) after a write */ | |
940 | static void | |
941 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
942 | unsigned int bytes_written) | |
943 | { | |
944 | loff_t end_of_write = offset + bytes_written; | |
945 | ||
946 | if (end_of_write > cifsi->server_eof) | |
947 | cifsi->server_eof = end_of_write; | |
948 | } | |
949 | ||
1da177e4 LT |
950 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
951 | size_t write_size, loff_t *poffset) | |
952 | { | |
953 | int rc = 0; | |
954 | unsigned int bytes_written = 0; | |
955 | unsigned int total_written; | |
956 | struct cifs_sb_info *cifs_sb; | |
957 | struct cifsTconInfo *pTcon; | |
958 | int xid, long_op; | |
959 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 960 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 961 | |
e6a00296 | 962 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
963 | |
964 | pTcon = cifs_sb->tcon; | |
965 | ||
b6b38f70 JP |
966 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
967 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
968 | |
969 | if (file->private_data == NULL) | |
970 | return -EBADF; | |
c21dfb69 | 971 | open_file = file->private_data; |
50c2f753 | 972 | |
838726c4 JL |
973 | rc = generic_write_checks(file, poffset, &write_size, 0); |
974 | if (rc) | |
975 | return rc; | |
976 | ||
1da177e4 | 977 | xid = GetXid(); |
1da177e4 | 978 | |
fbec9ab9 | 979 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
980 | for (total_written = 0; write_size > total_written; |
981 | total_written += bytes_written) { | |
982 | rc = -EAGAIN; | |
983 | while (rc == -EAGAIN) { | |
984 | if (file->private_data == NULL) { | |
985 | /* file has been closed on us */ | |
986 | FreeXid(xid); | |
987 | /* if we have gotten here we have written some data | |
988 | and blocked, and the file has been freed on us while | |
989 | we blocked so return what we managed to write */ | |
990 | return total_written; | |
fb8c4b14 | 991 | } |
1da177e4 LT |
992 | if (open_file->closePend) { |
993 | FreeXid(xid); | |
994 | if (total_written) | |
995 | return total_written; | |
996 | else | |
997 | return -EBADF; | |
998 | } | |
999 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1000 | /* we could deadlock if we called |
1001 | filemap_fdatawait from here so tell | |
1002 | reopen_file not to flush data to server | |
1003 | now */ | |
4b18f2a9 | 1004 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1005 | if (rc != 0) |
1006 | break; | |
1007 | } | |
1008 | ||
1009 | rc = CIFSSMBWrite(xid, pTcon, | |
1010 | open_file->netfid, | |
1011 | min_t(const int, cifs_sb->wsize, | |
1012 | write_size - total_written), | |
1013 | *poffset, &bytes_written, | |
1014 | NULL, write_data + total_written, long_op); | |
1015 | } | |
1016 | if (rc || (bytes_written == 0)) { | |
1017 | if (total_written) | |
1018 | break; | |
1019 | else { | |
1020 | FreeXid(xid); | |
1021 | return rc; | |
1022 | } | |
fbec9ab9 JL |
1023 | } else { |
1024 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1025 | *poffset += bytes_written; |
fbec9ab9 | 1026 | } |
133672ef | 1027 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1028 | 15 seconds is plenty */ |
1029 | } | |
1030 | ||
a4544347 | 1031 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1032 | |
1033 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1034 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1035 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1036 | /* Do not update local mtime - server will set its actual value on write |
1037 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1038 | * current_fs_time(inode->i_sb);*/ |
1039 | if (total_written > 0) { | |
1040 | spin_lock(&inode->i_lock); | |
1041 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1042 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1043 | *poffset); |
3677db10 | 1044 | spin_unlock(&inode->i_lock); |
1da177e4 | 1045 | } |
fb8c4b14 | 1046 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1047 | } |
1048 | FreeXid(xid); | |
1049 | return total_written; | |
1050 | } | |
1051 | ||
1052 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1053 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1054 | { |
1055 | int rc = 0; | |
1056 | unsigned int bytes_written = 0; | |
1057 | unsigned int total_written; | |
1058 | struct cifs_sb_info *cifs_sb; | |
1059 | struct cifsTconInfo *pTcon; | |
1060 | int xid, long_op; | |
1061 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1062 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1063 | |
e6a00296 | 1064 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1065 | |
1066 | pTcon = cifs_sb->tcon; | |
1067 | ||
b6b38f70 JP |
1068 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1069 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1070 | |
1071 | if (file->private_data == NULL) | |
1072 | return -EBADF; | |
c21dfb69 | 1073 | open_file = file->private_data; |
50c2f753 | 1074 | |
1da177e4 | 1075 | xid = GetXid(); |
1da177e4 | 1076 | |
fbec9ab9 | 1077 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1078 | for (total_written = 0; write_size > total_written; |
1079 | total_written += bytes_written) { | |
1080 | rc = -EAGAIN; | |
1081 | while (rc == -EAGAIN) { | |
1082 | if (file->private_data == NULL) { | |
1083 | /* file has been closed on us */ | |
1084 | FreeXid(xid); | |
1085 | /* if we have gotten here we have written some data | |
1086 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1087 | while we blocked so return what we managed to |
1da177e4 LT |
1088 | write */ |
1089 | return total_written; | |
fb8c4b14 | 1090 | } |
1da177e4 LT |
1091 | if (open_file->closePend) { |
1092 | FreeXid(xid); | |
1093 | if (total_written) | |
1094 | return total_written; | |
1095 | else | |
1096 | return -EBADF; | |
1097 | } | |
1098 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1099 | /* we could deadlock if we called |
1100 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1101 | reopen_file not to flush data to |
1da177e4 | 1102 | server now */ |
4b18f2a9 | 1103 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1104 | if (rc != 0) |
1105 | break; | |
1106 | } | |
fb8c4b14 SF |
1107 | if (experimEnabled || (pTcon->ses->server && |
1108 | ((pTcon->ses->server->secMode & | |
08775834 | 1109 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1110 | == 0))) { |
3e84469d SF |
1111 | struct kvec iov[2]; |
1112 | unsigned int len; | |
1113 | ||
0ae0efad | 1114 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1115 | write_size - total_written); |
1116 | /* iov[0] is reserved for smb header */ | |
1117 | iov[1].iov_base = (char *)write_data + | |
1118 | total_written; | |
1119 | iov[1].iov_len = len; | |
d6e04ae6 | 1120 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1121 | open_file->netfid, len, |
d6e04ae6 | 1122 | *poffset, &bytes_written, |
3e84469d | 1123 | iov, 1, long_op); |
d6e04ae6 | 1124 | } else |
60808233 SF |
1125 | rc = CIFSSMBWrite(xid, pTcon, |
1126 | open_file->netfid, | |
1127 | min_t(const int, cifs_sb->wsize, | |
1128 | write_size - total_written), | |
1129 | *poffset, &bytes_written, | |
1130 | write_data + total_written, | |
1131 | NULL, long_op); | |
1da177e4 LT |
1132 | } |
1133 | if (rc || (bytes_written == 0)) { | |
1134 | if (total_written) | |
1135 | break; | |
1136 | else { | |
1137 | FreeXid(xid); | |
1138 | return rc; | |
1139 | } | |
fbec9ab9 JL |
1140 | } else { |
1141 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1142 | *poffset += bytes_written; |
fbec9ab9 | 1143 | } |
133672ef | 1144 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1145 | 15 seconds is plenty */ |
1146 | } | |
1147 | ||
a4544347 | 1148 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1149 | |
1150 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1151 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1152 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1153 | /* file->f_path.dentry->d_inode->i_ctime = |
1154 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1155 | if (total_written > 0) { | |
1156 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1157 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1158 | i_size_write(file->f_path.dentry->d_inode, | |
1159 | *poffset); | |
1160 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1161 | } |
3677db10 | 1162 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1163 | } |
1164 | FreeXid(xid); | |
1165 | return total_written; | |
1166 | } | |
1167 | ||
630f3f0c SF |
1168 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1169 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1170 | { | |
1171 | struct cifsFileInfo *open_file = NULL; | |
1172 | ||
1173 | read_lock(&GlobalSMBSeslock); | |
1174 | /* we could simply get the first_list_entry since write-only entries | |
1175 | are always at the end of the list but since the first entry might | |
1176 | have a close pending, we go through the whole list */ | |
1177 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1178 | if (open_file->closePend) | |
1179 | continue; | |
1180 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1181 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1182 | if (!open_file->invalidHandle) { | |
1183 | /* found a good file */ | |
1184 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1185 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1186 | read_unlock(&GlobalSMBSeslock); |
1187 | return open_file; | |
1188 | } /* else might as well continue, and look for | |
1189 | another, or simply have the caller reopen it | |
1190 | again rather than trying to fix this handle */ | |
1191 | } else /* write only file */ | |
1192 | break; /* write only files are last so must be done */ | |
1193 | } | |
1194 | read_unlock(&GlobalSMBSeslock); | |
1195 | return NULL; | |
1196 | } | |
1197 | #endif | |
1198 | ||
dd99cd80 | 1199 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1200 | { |
1201 | struct cifsFileInfo *open_file; | |
2846d386 | 1202 | bool any_available = false; |
dd99cd80 | 1203 | int rc; |
6148a742 | 1204 | |
60808233 SF |
1205 | /* Having a null inode here (because mapping->host was set to zero by |
1206 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1207 | it being zero) during stress testcases so we need to check for it */ | |
1208 | ||
fb8c4b14 | 1209 | if (cifs_inode == NULL) { |
b6b38f70 | 1210 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1211 | dump_stack(); |
1212 | return NULL; | |
1213 | } | |
1214 | ||
6148a742 | 1215 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1216 | refind_writable: |
6148a742 | 1217 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1218 | if (open_file->closePend || |
1219 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1220 | continue; |
2846d386 | 1221 | |
6148a742 SF |
1222 | if (open_file->pfile && |
1223 | ((open_file->pfile->f_flags & O_RDWR) || | |
1224 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1225 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1226 | |
1227 | if (!open_file->invalidHandle) { | |
1228 | /* found a good writable file */ | |
1229 | read_unlock(&GlobalSMBSeslock); | |
1230 | return open_file; | |
1231 | } | |
8840dee9 | 1232 | |
6148a742 | 1233 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1234 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1235 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1236 | if (!rc) { |
9b22b0b7 SF |
1237 | if (!open_file->closePend) |
1238 | return open_file; | |
1239 | else { /* start over in case this was deleted */ | |
1240 | /* since the list could be modified */ | |
37c0eb46 | 1241 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1242 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1243 | goto refind_writable; |
37c0eb46 SF |
1244 | } |
1245 | } | |
9b22b0b7 SF |
1246 | |
1247 | /* if it fails, try another handle if possible - | |
1248 | (we can not do this if closePending since | |
1249 | loop could be modified - in which case we | |
1250 | have to start at the beginning of the list | |
1251 | again. Note that it would be bad | |
1252 | to hold up writepages here (rather than | |
1253 | in caller) with continuous retries */ | |
b6b38f70 | 1254 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1255 | read_lock(&GlobalSMBSeslock); |
1256 | /* can not use this handle, no write | |
1257 | pending on this one after all */ | |
6ab409b5 | 1258 | cifsFileInfo_put(open_file); |
8840dee9 | 1259 | |
9b22b0b7 SF |
1260 | if (open_file->closePend) /* list could have changed */ |
1261 | goto refind_writable; | |
1262 | /* else we simply continue to the next entry. Thus | |
1263 | we do not loop on reopen errors. If we | |
1264 | can not reopen the file, for example if we | |
1265 | reconnected to a server with another client | |
1266 | racing to delete or lock the file we would not | |
1267 | make progress if we restarted before the beginning | |
1268 | of the loop here. */ | |
6148a742 SF |
1269 | } |
1270 | } | |
2846d386 JL |
1271 | /* couldn't find useable FH with same pid, try any available */ |
1272 | if (!any_available) { | |
1273 | any_available = true; | |
1274 | goto refind_writable; | |
1275 | } | |
6148a742 SF |
1276 | read_unlock(&GlobalSMBSeslock); |
1277 | return NULL; | |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1281 | { | |
1282 | struct address_space *mapping = page->mapping; | |
1283 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1284 | char *write_data; | |
1285 | int rc = -EFAULT; | |
1286 | int bytes_written = 0; | |
1287 | struct cifs_sb_info *cifs_sb; | |
1288 | struct cifsTconInfo *pTcon; | |
1289 | struct inode *inode; | |
6148a742 | 1290 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1291 | |
1292 | if (!mapping || !mapping->host) | |
1293 | return -EFAULT; | |
1294 | ||
1295 | inode = page->mapping->host; | |
1296 | cifs_sb = CIFS_SB(inode->i_sb); | |
1297 | pTcon = cifs_sb->tcon; | |
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; |
fbec9ab9 | 1356 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1357 | struct page *page; |
1358 | struct pagevec pvec; | |
1359 | int rc = 0; | |
1360 | int scanned = 0; | |
fbec9ab9 | 1361 | int xid, long_op; |
1da177e4 | 1362 | |
37c0eb46 | 1363 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1364 | |
37c0eb46 SF |
1365 | /* |
1366 | * If wsize is smaller that the page cache size, default to writing | |
1367 | * one page at a time via cifs_writepage | |
1368 | */ | |
1369 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1370 | return generic_writepages(mapping, wbc); | |
1371 | ||
fb8c4b14 SF |
1372 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1373 | if (cifs_sb->tcon->ses->server->secMode & | |
1374 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1375 | if (!experimEnabled) | |
60808233 | 1376 | return generic_writepages(mapping, wbc); |
4a77118c | 1377 | |
9a0c8230 | 1378 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1379 | if (iov == NULL) |
9a0c8230 SF |
1380 | return generic_writepages(mapping, wbc); |
1381 | ||
1382 | ||
37c0eb46 SF |
1383 | /* |
1384 | * BB: Is this meaningful for a non-block-device file system? | |
1385 | * If it is, we should test it again after we do I/O | |
1386 | */ | |
1387 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1388 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1389 | kfree(iov); |
37c0eb46 SF |
1390 | return 0; |
1391 | } | |
1392 | ||
1da177e4 LT |
1393 | xid = GetXid(); |
1394 | ||
37c0eb46 | 1395 | pagevec_init(&pvec, 0); |
111ebb6e | 1396 | if (wbc->range_cyclic) { |
37c0eb46 | 1397 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1398 | end = -1; |
1399 | } else { | |
1400 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1401 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1402 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1403 | range_whole = 1; | |
37c0eb46 SF |
1404 | scanned = 1; |
1405 | } | |
1406 | retry: | |
1407 | while (!done && (index <= end) && | |
1408 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1409 | PAGECACHE_TAG_DIRTY, | |
1410 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1411 | int first; | |
1412 | unsigned int i; | |
1413 | ||
37c0eb46 SF |
1414 | first = -1; |
1415 | next = 0; | |
1416 | n_iov = 0; | |
1417 | bytes_to_write = 0; | |
1418 | ||
1419 | for (i = 0; i < nr_pages; i++) { | |
1420 | page = pvec.pages[i]; | |
1421 | /* | |
1422 | * At this point we hold neither mapping->tree_lock nor | |
1423 | * lock on the page itself: the page may be truncated or | |
1424 | * invalidated (changing page->mapping to NULL), or even | |
1425 | * swizzled back from swapper_space to tmpfs file | |
1426 | * mapping | |
1427 | */ | |
1428 | ||
1429 | if (first < 0) | |
1430 | lock_page(page); | |
529ae9aa | 1431 | else if (!trylock_page(page)) |
37c0eb46 SF |
1432 | break; |
1433 | ||
1434 | if (unlikely(page->mapping != mapping)) { | |
1435 | unlock_page(page); | |
1436 | break; | |
1437 | } | |
1438 | ||
111ebb6e | 1439 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1440 | done = 1; |
1441 | unlock_page(page); | |
1442 | break; | |
1443 | } | |
1444 | ||
1445 | if (next && (page->index != next)) { | |
1446 | /* Not next consecutive page */ | |
1447 | unlock_page(page); | |
1448 | break; | |
1449 | } | |
1450 | ||
1451 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1452 | wait_on_page_writeback(page); | |
1453 | ||
1454 | if (PageWriteback(page) || | |
cb876f45 | 1455 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1456 | unlock_page(page); |
1457 | break; | |
1458 | } | |
84d2f07e | 1459 | |
cb876f45 LT |
1460 | /* |
1461 | * This actually clears the dirty bit in the radix tree. | |
1462 | * See cifs_writepage() for more commentary. | |
1463 | */ | |
1464 | set_page_writeback(page); | |
1465 | ||
84d2f07e SF |
1466 | if (page_offset(page) >= mapping->host->i_size) { |
1467 | done = 1; | |
1468 | unlock_page(page); | |
cb876f45 | 1469 | end_page_writeback(page); |
84d2f07e SF |
1470 | break; |
1471 | } | |
1472 | ||
37c0eb46 SF |
1473 | /* |
1474 | * BB can we get rid of this? pages are held by pvec | |
1475 | */ | |
1476 | page_cache_get(page); | |
1477 | ||
84d2f07e SF |
1478 | len = min(mapping->host->i_size - page_offset(page), |
1479 | (loff_t)PAGE_CACHE_SIZE); | |
1480 | ||
37c0eb46 SF |
1481 | /* reserve iov[0] for the smb header */ |
1482 | n_iov++; | |
1483 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1484 | iov[n_iov].iov_len = len; |
1485 | bytes_to_write += len; | |
37c0eb46 SF |
1486 | |
1487 | if (first < 0) { | |
1488 | first = i; | |
1489 | offset = page_offset(page); | |
1490 | } | |
1491 | next = page->index + 1; | |
1492 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1493 | break; | |
1494 | } | |
1495 | if (n_iov) { | |
23e7dd7d SF |
1496 | /* Search for a writable handle every time we call |
1497 | * CIFSSMBWrite2. We can't rely on the last handle | |
1498 | * we used to still be valid | |
1499 | */ | |
1500 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1501 | if (!open_file) { | |
b6b38f70 | 1502 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1503 | rc = -EBADF; |
1047abc1 | 1504 | } else { |
fbec9ab9 | 1505 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1506 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1507 | open_file->netfid, | |
1508 | bytes_to_write, offset, | |
1509 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1510 | long_op); |
6ab409b5 | 1511 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1512 | cifs_update_eof(cifsi, offset, bytes_written); |
1513 | ||
23e7dd7d | 1514 | if (rc || bytes_written < bytes_to_write) { |
b6b38f70 JP |
1515 | cERROR(1, "Write2 ret %d, wrote %d", |
1516 | rc, bytes_written); | |
23e7dd7d SF |
1517 | /* BB what if continued retry is |
1518 | requested via mount flags? */ | |
cea21805 JL |
1519 | if (rc == -ENOSPC) |
1520 | set_bit(AS_ENOSPC, &mapping->flags); | |
1521 | else | |
1522 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1523 | } else { |
1524 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1525 | bytes_written); | |
1526 | } | |
37c0eb46 SF |
1527 | } |
1528 | for (i = 0; i < n_iov; i++) { | |
1529 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1530 | /* Should we also set page error on |
1531 | success rc but too little data written? */ | |
1532 | /* BB investigate retry logic on temporary | |
1533 | server crash cases and how recovery works | |
fb8c4b14 SF |
1534 | when page marked as error */ |
1535 | if (rc) | |
eb9bdaa3 | 1536 | SetPageError(page); |
37c0eb46 SF |
1537 | kunmap(page); |
1538 | unlock_page(page); | |
cb876f45 | 1539 | end_page_writeback(page); |
37c0eb46 SF |
1540 | page_cache_release(page); |
1541 | } | |
1542 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1543 | done = 1; | |
1544 | index = next; | |
b066a48c DK |
1545 | } else |
1546 | /* Need to re-find the pages we skipped */ | |
1547 | index = pvec.pages[0]->index + 1; | |
1548 | ||
37c0eb46 SF |
1549 | pagevec_release(&pvec); |
1550 | } | |
1551 | if (!scanned && !done) { | |
1552 | /* | |
1553 | * We hit the last page and there is more work to be done: wrap | |
1554 | * back to the start of the file | |
1555 | */ | |
1556 | scanned = 1; | |
1557 | index = 0; | |
1558 | goto retry; | |
1559 | } | |
111ebb6e | 1560 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1561 | mapping->writeback_index = index; |
1562 | ||
1da177e4 | 1563 | FreeXid(xid); |
9a0c8230 | 1564 | kfree(iov); |
1da177e4 LT |
1565 | return rc; |
1566 | } | |
1da177e4 | 1567 | |
fb8c4b14 | 1568 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1569 | { |
1570 | int rc = -EFAULT; | |
1571 | int xid; | |
1572 | ||
1573 | xid = GetXid(); | |
1574 | /* BB add check for wbc flags */ | |
1575 | page_cache_get(page); | |
ad7a2926 | 1576 | if (!PageUptodate(page)) |
b6b38f70 | 1577 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1578 | |
1579 | /* | |
1580 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1581 | * | |
1582 | * A writepage() implementation always needs to do either this, | |
1583 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1584 | * the case of a failure. | |
1585 | * | |
1586 | * Just unlocking the page will cause the radix tree tag-bits | |
1587 | * to fail to update with the state of the page correctly. | |
1588 | */ | |
fb8c4b14 | 1589 | set_page_writeback(page); |
1da177e4 LT |
1590 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1591 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1592 | unlock_page(page); | |
cb876f45 LT |
1593 | end_page_writeback(page); |
1594 | page_cache_release(page); | |
1da177e4 LT |
1595 | FreeXid(xid); |
1596 | return rc; | |
1597 | } | |
1598 | ||
d9414774 NP |
1599 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1600 | loff_t pos, unsigned len, unsigned copied, | |
1601 | struct page *page, void *fsdata) | |
1da177e4 | 1602 | { |
d9414774 NP |
1603 | int rc; |
1604 | struct inode *inode = mapping->host; | |
1da177e4 | 1605 | |
b6b38f70 JP |
1606 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1607 | page, pos, copied); | |
d9414774 | 1608 | |
a98ee8c1 JL |
1609 | if (PageChecked(page)) { |
1610 | if (copied == len) | |
1611 | SetPageUptodate(page); | |
1612 | ClearPageChecked(page); | |
1613 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1614 | SetPageUptodate(page); |
ad7a2926 | 1615 | |
1da177e4 | 1616 | if (!PageUptodate(page)) { |
d9414774 NP |
1617 | char *page_data; |
1618 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1619 | int xid; | |
1620 | ||
1621 | xid = GetXid(); | |
1da177e4 LT |
1622 | /* this is probably better than directly calling |
1623 | partialpage_write since in this function the file handle is | |
1624 | known which we might as well leverage */ | |
1625 | /* BB check if anything else missing out of ppw | |
1626 | such as updating last write time */ | |
1627 | page_data = kmap(page); | |
d9414774 NP |
1628 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1629 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1630 | kunmap(page); |
d9414774 NP |
1631 | |
1632 | FreeXid(xid); | |
fb8c4b14 | 1633 | } else { |
d9414774 NP |
1634 | rc = copied; |
1635 | pos += copied; | |
1da177e4 LT |
1636 | set_page_dirty(page); |
1637 | } | |
1638 | ||
d9414774 NP |
1639 | if (rc > 0) { |
1640 | spin_lock(&inode->i_lock); | |
1641 | if (pos > inode->i_size) | |
1642 | i_size_write(inode, pos); | |
1643 | spin_unlock(&inode->i_lock); | |
1644 | } | |
1645 | ||
1646 | unlock_page(page); | |
1647 | page_cache_release(page); | |
1648 | ||
1da177e4 LT |
1649 | return rc; |
1650 | } | |
1651 | ||
7ea80859 | 1652 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1653 | { |
1654 | int xid; | |
1655 | int rc = 0; | |
b298f223 | 1656 | struct cifsTconInfo *tcon; |
c21dfb69 | 1657 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1658 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1659 | |
1660 | xid = GetXid(); | |
1661 | ||
b6b38f70 | 1662 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1663 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1664 | |
cea21805 JL |
1665 | rc = filemap_write_and_wait(inode->i_mapping); |
1666 | if (rc == 0) { | |
1667 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1668 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1669 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1670 | if (!rc && tcon && smbfile && |
4717bed6 | 1671 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1672 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1673 | } |
b298f223 | 1674 | |
1da177e4 LT |
1675 | FreeXid(xid); |
1676 | return rc; | |
1677 | } | |
1678 | ||
3978d717 | 1679 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1680 | { |
1681 | struct address_space *mapping; | |
1682 | struct inode *inode; | |
1683 | unsigned long index = page->index; | |
1684 | unsigned int rpages = 0; | |
1685 | int rc = 0; | |
1686 | ||
f19159dc | 1687 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1688 | mapping = page->mapping; |
1689 | if (!mapping) | |
1690 | return 0; | |
1691 | inode = mapping->host; | |
1692 | if (!inode) | |
3978d717 | 1693 | return; */ |
1da177e4 | 1694 | |
fb8c4b14 | 1695 | /* fill in rpages then |
1da177e4 LT |
1696 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1697 | ||
b6b38f70 | 1698 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1699 | |
3978d717 | 1700 | #if 0 |
1da177e4 LT |
1701 | if (rc < 0) |
1702 | return rc; | |
1703 | return 0; | |
3978d717 | 1704 | #endif |
1da177e4 LT |
1705 | } */ |
1706 | ||
1707 | /* | |
1708 | * As file closes, flush all cached write data for this inode checking | |
1709 | * for write behind errors. | |
1710 | */ | |
75e1fcc0 | 1711 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1712 | { |
fb8c4b14 | 1713 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1714 | int rc = 0; |
1715 | ||
1716 | /* Rather than do the steps manually: | |
1717 | lock the inode for writing | |
1718 | loop through pages looking for write behind data (dirty pages) | |
1719 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1720 | send to server (prefer in parallel) | |
1721 | deal with writebehind errors | |
1722 | unlock inode for writing | |
1723 | filemapfdatawrite appears easier for the time being */ | |
1724 | ||
1725 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1726 | /* reset wb rc if we were able to write out dirty pages */ |
1727 | if (!rc) { | |
1728 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1729 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1730 | } |
50c2f753 | 1731 | |
b6b38f70 | 1732 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1733 | |
1734 | return rc; | |
1735 | } | |
1736 | ||
1737 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1738 | size_t read_size, loff_t *poffset) | |
1739 | { | |
1740 | int rc = -EACCES; | |
1741 | unsigned int bytes_read = 0; | |
1742 | unsigned int total_read = 0; | |
1743 | unsigned int current_read_size; | |
1744 | struct cifs_sb_info *cifs_sb; | |
1745 | struct cifsTconInfo *pTcon; | |
1746 | int xid; | |
1747 | struct cifsFileInfo *open_file; | |
1748 | char *smb_read_data; | |
1749 | char __user *current_offset; | |
1750 | struct smb_com_read_rsp *pSMBr; | |
1751 | ||
1752 | xid = GetXid(); | |
e6a00296 | 1753 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1754 | pTcon = cifs_sb->tcon; |
1755 | ||
1756 | if (file->private_data == NULL) { | |
0f3bc09e | 1757 | rc = -EBADF; |
1da177e4 | 1758 | FreeXid(xid); |
0f3bc09e | 1759 | return rc; |
1da177e4 | 1760 | } |
c21dfb69 | 1761 | open_file = file->private_data; |
1da177e4 | 1762 | |
ad7a2926 | 1763 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1764 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1765 | |
1da177e4 LT |
1766 | for (total_read = 0, current_offset = read_data; |
1767 | read_size > total_read; | |
1768 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1769 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1770 | cifs_sb->rsize); |
1771 | rc = -EAGAIN; | |
1772 | smb_read_data = NULL; | |
1773 | while (rc == -EAGAIN) { | |
ec637e3f | 1774 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1775 | if ((open_file->invalidHandle) && |
1da177e4 | 1776 | (!open_file->closePend)) { |
4b18f2a9 | 1777 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1778 | if (rc != 0) |
1779 | break; | |
1780 | } | |
bfa0d75a | 1781 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1782 | open_file->netfid, |
1783 | current_read_size, *poffset, | |
1784 | &bytes_read, &smb_read_data, | |
1785 | &buf_type); | |
1da177e4 | 1786 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1787 | if (smb_read_data) { |
93544cc6 SF |
1788 | if (copy_to_user(current_offset, |
1789 | smb_read_data + | |
1790 | 4 /* RFC1001 length field */ + | |
1791 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1792 | bytes_read)) |
93544cc6 | 1793 | rc = -EFAULT; |
93544cc6 | 1794 | |
fb8c4b14 | 1795 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1796 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1797 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1798 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1799 | smb_read_data = NULL; |
1800 | } | |
1801 | } | |
1802 | if (rc || (bytes_read == 0)) { | |
1803 | if (total_read) { | |
1804 | break; | |
1805 | } else { | |
1806 | FreeXid(xid); | |
1807 | return rc; | |
1808 | } | |
1809 | } else { | |
a4544347 | 1810 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1811 | *poffset += bytes_read; |
1812 | } | |
1813 | } | |
1814 | FreeXid(xid); | |
1815 | return total_read; | |
1816 | } | |
1817 | ||
1818 | ||
1819 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1820 | loff_t *poffset) | |
1821 | { | |
1822 | int rc = -EACCES; | |
1823 | unsigned int bytes_read = 0; | |
1824 | unsigned int total_read; | |
1825 | unsigned int current_read_size; | |
1826 | struct cifs_sb_info *cifs_sb; | |
1827 | struct cifsTconInfo *pTcon; | |
1828 | int xid; | |
1829 | char *current_offset; | |
1830 | struct cifsFileInfo *open_file; | |
ec637e3f | 1831 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1832 | |
1833 | xid = GetXid(); | |
e6a00296 | 1834 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1835 | pTcon = cifs_sb->tcon; |
1836 | ||
1837 | if (file->private_data == NULL) { | |
0f3bc09e | 1838 | rc = -EBADF; |
1da177e4 | 1839 | FreeXid(xid); |
0f3bc09e | 1840 | return rc; |
1da177e4 | 1841 | } |
c21dfb69 | 1842 | open_file = file->private_data; |
1da177e4 LT |
1843 | |
1844 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1845 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1846 | |
fb8c4b14 | 1847 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1848 | read_size > total_read; |
1849 | total_read += bytes_read, current_offset += bytes_read) { | |
1850 | current_read_size = min_t(const int, read_size - total_read, | |
1851 | cifs_sb->rsize); | |
f9f5c817 SF |
1852 | /* For windows me and 9x we do not want to request more |
1853 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1854 | if ((pTcon->ses) && |
f9f5c817 SF |
1855 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1856 | current_read_size = min_t(const int, current_read_size, | |
1857 | pTcon->ses->server->maxBuf - 128); | |
1858 | } | |
1da177e4 LT |
1859 | rc = -EAGAIN; |
1860 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1861 | if ((open_file->invalidHandle) && |
1da177e4 | 1862 | (!open_file->closePend)) { |
4b18f2a9 | 1863 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1864 | if (rc != 0) |
1865 | break; | |
1866 | } | |
bfa0d75a | 1867 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1868 | open_file->netfid, |
1869 | current_read_size, *poffset, | |
1870 | &bytes_read, ¤t_offset, | |
1871 | &buf_type); | |
1da177e4 LT |
1872 | } |
1873 | if (rc || (bytes_read == 0)) { | |
1874 | if (total_read) { | |
1875 | break; | |
1876 | } else { | |
1877 | FreeXid(xid); | |
1878 | return rc; | |
1879 | } | |
1880 | } else { | |
a4544347 | 1881 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1882 | *poffset += bytes_read; |
1883 | } | |
1884 | } | |
1885 | FreeXid(xid); | |
1886 | return total_read; | |
1887 | } | |
1888 | ||
1889 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1890 | { | |
1da177e4 LT |
1891 | int rc, xid; |
1892 | ||
1893 | xid = GetXid(); | |
abab095d | 1894 | rc = cifs_revalidate_file(file); |
1da177e4 | 1895 | if (rc) { |
b6b38f70 | 1896 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1897 | FreeXid(xid); |
1898 | return rc; | |
1899 | } | |
1900 | rc = generic_file_mmap(file, vma); | |
1901 | FreeXid(xid); | |
1902 | return rc; | |
1903 | } | |
1904 | ||
1905 | ||
fb8c4b14 | 1906 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1907 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1908 | { |
1909 | struct page *page; | |
1910 | char *target; | |
1911 | ||
1912 | while (bytes_read > 0) { | |
1913 | if (list_empty(pages)) | |
1914 | break; | |
1915 | ||
1916 | page = list_entry(pages->prev, struct page, lru); | |
1917 | list_del(&page->lru); | |
1918 | ||
315e995c | 1919 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1920 | GFP_KERNEL)) { |
1921 | page_cache_release(page); | |
b6b38f70 | 1922 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1923 | data += PAGE_CACHE_SIZE; |
1924 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1925 | continue; |
1926 | } | |
06b43672 | 1927 | page_cache_release(page); |
1da177e4 | 1928 | |
fb8c4b14 | 1929 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1930 | |
1931 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1932 | memcpy(target, data, bytes_read); | |
1933 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1934 | memset(target + bytes_read, 0, |
1da177e4 LT |
1935 | PAGE_CACHE_SIZE - bytes_read); |
1936 | bytes_read = 0; | |
1937 | } else { | |
1938 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1939 | bytes_read -= PAGE_CACHE_SIZE; | |
1940 | } | |
1941 | kunmap_atomic(target, KM_USER0); | |
1942 | ||
1943 | flush_dcache_page(page); | |
1944 | SetPageUptodate(page); | |
1945 | unlock_page(page); | |
1da177e4 LT |
1946 | data += PAGE_CACHE_SIZE; |
1947 | } | |
1948 | return; | |
1949 | } | |
1950 | ||
1951 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1952 | struct list_head *page_list, unsigned num_pages) | |
1953 | { | |
1954 | int rc = -EACCES; | |
1955 | int xid; | |
1956 | loff_t offset; | |
1957 | struct page *page; | |
1958 | struct cifs_sb_info *cifs_sb; | |
1959 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1960 | unsigned int bytes_read = 0; |
fb8c4b14 | 1961 | unsigned int read_size, i; |
1da177e4 LT |
1962 | char *smb_read_data = NULL; |
1963 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1964 | struct cifsFileInfo *open_file; |
ec637e3f | 1965 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1966 | |
1967 | xid = GetXid(); | |
1968 | if (file->private_data == NULL) { | |
0f3bc09e | 1969 | rc = -EBADF; |
1da177e4 | 1970 | FreeXid(xid); |
0f3bc09e | 1971 | return rc; |
1da177e4 | 1972 | } |
c21dfb69 | 1973 | open_file = file->private_data; |
e6a00296 | 1974 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1975 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1976 | |
f19159dc | 1977 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1978 | for (i = 0; i < num_pages; ) { |
1979 | unsigned contig_pages; | |
1980 | struct page *tmp_page; | |
1981 | unsigned long expected_index; | |
1982 | ||
1983 | if (list_empty(page_list)) | |
1984 | break; | |
1985 | ||
1986 | page = list_entry(page_list->prev, struct page, lru); | |
1987 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1988 | ||
1989 | /* count adjacent pages that we will read into */ | |
1990 | contig_pages = 0; | |
fb8c4b14 | 1991 | expected_index = |
1da177e4 | 1992 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1993 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1994 | if (tmp_page->index == expected_index) { |
1995 | contig_pages++; | |
1996 | expected_index++; | |
1997 | } else | |
fb8c4b14 | 1998 | break; |
1da177e4 LT |
1999 | } |
2000 | if (contig_pages + i > num_pages) | |
2001 | contig_pages = num_pages - i; | |
2002 | ||
2003 | /* for reads over a certain size could initiate async | |
2004 | read ahead */ | |
2005 | ||
2006 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2007 | /* Read size needs to be in multiples of one page */ | |
2008 | read_size = min_t(const unsigned int, read_size, | |
2009 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2010 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2011 | read_size, contig_pages); | |
1da177e4 LT |
2012 | rc = -EAGAIN; |
2013 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2014 | if ((open_file->invalidHandle) && |
1da177e4 | 2015 | (!open_file->closePend)) { |
4b18f2a9 | 2016 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2017 | if (rc != 0) |
2018 | break; | |
2019 | } | |
2020 | ||
bfa0d75a | 2021 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2022 | open_file->netfid, |
2023 | read_size, offset, | |
2024 | &bytes_read, &smb_read_data, | |
2025 | &buf_type); | |
a9d02ad4 | 2026 | /* BB more RC checks ? */ |
fb8c4b14 | 2027 | if (rc == -EAGAIN) { |
1da177e4 | 2028 | if (smb_read_data) { |
fb8c4b14 | 2029 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2030 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2031 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2032 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2033 | smb_read_data = NULL; |
2034 | } | |
2035 | } | |
2036 | } | |
2037 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2038 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2039 | break; |
2040 | } else if (bytes_read > 0) { | |
6f88cc2e | 2041 | task_io_account_read(bytes_read); |
1da177e4 LT |
2042 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2043 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2044 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2045 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2046 | |
2047 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2048 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2049 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2050 | i++; /* account for partial page */ |
2051 | ||
fb8c4b14 | 2052 | /* server copy of file can have smaller size |
1da177e4 | 2053 | than client */ |
fb8c4b14 SF |
2054 | /* BB do we need to verify this common case ? |
2055 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2056 | we will hit it on next read */ |
2057 | ||
05ac9d4b | 2058 | /* break; */ |
1da177e4 LT |
2059 | } |
2060 | } else { | |
b6b38f70 | 2061 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2062 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2063 | bytes_read, offset); |
fb8c4b14 | 2064 | /* BB turn off caching and do new lookup on |
1da177e4 | 2065 | file size at server? */ |
1da177e4 LT |
2066 | break; |
2067 | } | |
2068 | if (smb_read_data) { | |
fb8c4b14 | 2069 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2070 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2071 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2072 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2073 | smb_read_data = NULL; |
2074 | } | |
2075 | bytes_read = 0; | |
2076 | } | |
2077 | ||
1da177e4 LT |
2078 | /* need to free smb_read_data buf before exit */ |
2079 | if (smb_read_data) { | |
fb8c4b14 | 2080 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2081 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2082 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2083 | cifs_buf_release(smb_read_data); |
1da177e4 | 2084 | smb_read_data = NULL; |
fb8c4b14 | 2085 | } |
1da177e4 LT |
2086 | |
2087 | FreeXid(xid); | |
2088 | return rc; | |
2089 | } | |
2090 | ||
2091 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2092 | loff_t *poffset) | |
2093 | { | |
2094 | char *read_data; | |
2095 | int rc; | |
2096 | ||
2097 | page_cache_get(page); | |
2098 | read_data = kmap(page); | |
2099 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2100 | |
1da177e4 | 2101 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2102 | |
1da177e4 LT |
2103 | if (rc < 0) |
2104 | goto io_error; | |
2105 | else | |
b6b38f70 | 2106 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2107 | |
e6a00296 JJS |
2108 | file->f_path.dentry->d_inode->i_atime = |
2109 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2110 | |
1da177e4 LT |
2111 | if (PAGE_CACHE_SIZE > rc) |
2112 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2113 | ||
2114 | flush_dcache_page(page); | |
2115 | SetPageUptodate(page); | |
2116 | rc = 0; | |
fb8c4b14 | 2117 | |
1da177e4 | 2118 | io_error: |
fb8c4b14 | 2119 | kunmap(page); |
1da177e4 LT |
2120 | page_cache_release(page); |
2121 | return rc; | |
2122 | } | |
2123 | ||
2124 | static int cifs_readpage(struct file *file, struct page *page) | |
2125 | { | |
2126 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2127 | int rc = -EACCES; | |
2128 | int xid; | |
2129 | ||
2130 | xid = GetXid(); | |
2131 | ||
2132 | if (file->private_data == NULL) { | |
0f3bc09e | 2133 | rc = -EBADF; |
1da177e4 | 2134 | FreeXid(xid); |
0f3bc09e | 2135 | return rc; |
1da177e4 LT |
2136 | } |
2137 | ||
b6b38f70 JP |
2138 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2139 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2140 | |
2141 | rc = cifs_readpage_worker(file, page, &offset); | |
2142 | ||
2143 | unlock_page(page); | |
2144 | ||
2145 | FreeXid(xid); | |
2146 | return rc; | |
2147 | } | |
2148 | ||
a403a0a3 SF |
2149 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2150 | { | |
2151 | struct cifsFileInfo *open_file; | |
2152 | ||
2153 | read_lock(&GlobalSMBSeslock); | |
2154 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2155 | if (open_file->closePend) | |
2156 | continue; | |
2157 | if (open_file->pfile && | |
2158 | ((open_file->pfile->f_flags & O_RDWR) || | |
2159 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2160 | read_unlock(&GlobalSMBSeslock); | |
2161 | return 1; | |
2162 | } | |
2163 | } | |
2164 | read_unlock(&GlobalSMBSeslock); | |
2165 | return 0; | |
2166 | } | |
2167 | ||
1da177e4 LT |
2168 | /* We do not want to update the file size from server for inodes |
2169 | open for write - to avoid races with writepage extending | |
2170 | the file - in the future we could consider allowing | |
fb8c4b14 | 2171 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2172 | but this is tricky to do without racing with writebehind |
2173 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2174 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2175 | { |
a403a0a3 | 2176 | if (!cifsInode) |
4b18f2a9 | 2177 | return true; |
50c2f753 | 2178 | |
a403a0a3 SF |
2179 | if (is_inode_writable(cifsInode)) { |
2180 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2181 | struct cifs_sb_info *cifs_sb; |
2182 | ||
c32a0b68 | 2183 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2184 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2185 | /* since no page cache to corrupt on directio |
c32a0b68 | 2186 | we can change size safely */ |
4b18f2a9 | 2187 | return true; |
c32a0b68 SF |
2188 | } |
2189 | ||
fb8c4b14 | 2190 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2191 | return true; |
7ba52631 | 2192 | |
4b18f2a9 | 2193 | return false; |
23e7dd7d | 2194 | } else |
4b18f2a9 | 2195 | return true; |
1da177e4 LT |
2196 | } |
2197 | ||
d9414774 NP |
2198 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2199 | loff_t pos, unsigned len, unsigned flags, | |
2200 | struct page **pagep, void **fsdata) | |
1da177e4 | 2201 | { |
d9414774 NP |
2202 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2203 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2204 | loff_t page_start = pos & PAGE_MASK; |
2205 | loff_t i_size; | |
2206 | struct page *page; | |
2207 | int rc = 0; | |
d9414774 | 2208 | |
b6b38f70 | 2209 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2210 | |
54566b2c | 2211 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2212 | if (!page) { |
2213 | rc = -ENOMEM; | |
2214 | goto out; | |
2215 | } | |
8a236264 | 2216 | |
a98ee8c1 JL |
2217 | if (PageUptodate(page)) |
2218 | goto out; | |
8a236264 | 2219 | |
a98ee8c1 JL |
2220 | /* |
2221 | * If we write a full page it will be up to date, no need to read from | |
2222 | * the server. If the write is short, we'll end up doing a sync write | |
2223 | * instead. | |
2224 | */ | |
2225 | if (len == PAGE_CACHE_SIZE) | |
2226 | goto out; | |
8a236264 | 2227 | |
a98ee8c1 JL |
2228 | /* |
2229 | * optimize away the read when we have an oplock, and we're not | |
2230 | * expecting to use any of the data we'd be reading in. That | |
2231 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2232 | * and the write will cover all of the existing data. | |
2233 | */ | |
2234 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2235 | i_size = i_size_read(mapping->host); | |
2236 | if (page_start >= i_size || | |
2237 | (offset == 0 && (pos + len) >= i_size)) { | |
2238 | zero_user_segments(page, 0, offset, | |
2239 | offset + len, | |
2240 | PAGE_CACHE_SIZE); | |
2241 | /* | |
2242 | * PageChecked means that the parts of the page | |
2243 | * to which we're not writing are considered up | |
2244 | * to date. Once the data is copied to the | |
2245 | * page, it can be set uptodate. | |
2246 | */ | |
2247 | SetPageChecked(page); | |
2248 | goto out; | |
2249 | } | |
2250 | } | |
d9414774 | 2251 | |
a98ee8c1 JL |
2252 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2253 | /* | |
2254 | * might as well read a page, it is fast enough. If we get | |
2255 | * an error, we don't need to return it. cifs_write_end will | |
2256 | * do a sync write instead since PG_uptodate isn't set. | |
2257 | */ | |
2258 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2259 | } else { |
2260 | /* we could try using another file handle if there is one - | |
2261 | but how would we lock it to prevent close of that handle | |
2262 | racing with this read? In any case | |
d9414774 | 2263 | this will be written out by write_end so is fine */ |
1da177e4 | 2264 | } |
a98ee8c1 JL |
2265 | out: |
2266 | *pagep = page; | |
2267 | return rc; | |
1da177e4 LT |
2268 | } |
2269 | ||
3bc303c2 JL |
2270 | static void |
2271 | cifs_oplock_break(struct slow_work *work) | |
2272 | { | |
2273 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2274 | oplock_break); | |
2275 | struct inode *inode = cfile->pInode; | |
2276 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2277 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2278 | int rc, waitrc = 0; | |
2279 | ||
2280 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2281 | if (cinode->clientCanCacheRead) |
8737c930 | 2282 | break_lease(inode, O_RDONLY); |
d54ff732 | 2283 | else |
8737c930 | 2284 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2285 | rc = filemap_fdatawrite(inode->i_mapping); |
2286 | if (cinode->clientCanCacheRead == 0) { | |
2287 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2288 | invalidate_remote_inode(inode); | |
2289 | } | |
2290 | if (!rc) | |
2291 | rc = waitrc; | |
2292 | if (rc) | |
2293 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2294 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2295 | } |
2296 | ||
2297 | /* | |
2298 | * releasing stale oplock after recent reconnect of smb session using | |
2299 | * a now incorrect file handle is not a data integrity issue but do | |
2300 | * not bother sending an oplock release if session to server still is | |
2301 | * disconnected since oplock already released by the server | |
2302 | */ | |
2303 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2304 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2305 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2306 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 JL |
2307 | } |
2308 | } | |
2309 | ||
2310 | static int | |
2311 | cifs_oplock_break_get(struct slow_work *work) | |
2312 | { | |
2313 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2314 | oplock_break); | |
2315 | mntget(cfile->mnt); | |
2316 | cifsFileInfo_get(cfile); | |
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | static void | |
2321 | cifs_oplock_break_put(struct slow_work *work) | |
2322 | { | |
2323 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2324 | oplock_break); | |
2325 | mntput(cfile->mnt); | |
2326 | cifsFileInfo_put(cfile); | |
2327 | } | |
2328 | ||
2329 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2330 | .get_ref = cifs_oplock_break_get, | |
2331 | .put_ref = cifs_oplock_break_put, | |
2332 | .execute = cifs_oplock_break, | |
2333 | }; | |
2334 | ||
f5e54d6e | 2335 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2336 | .readpage = cifs_readpage, |
2337 | .readpages = cifs_readpages, | |
2338 | .writepage = cifs_writepage, | |
37c0eb46 | 2339 | .writepages = cifs_writepages, |
d9414774 NP |
2340 | .write_begin = cifs_write_begin, |
2341 | .write_end = cifs_write_end, | |
1da177e4 LT |
2342 | .set_page_dirty = __set_page_dirty_nobuffers, |
2343 | /* .sync_page = cifs_sync_page, */ | |
2344 | /* .direct_IO = */ | |
2345 | }; | |
273d81d6 DK |
2346 | |
2347 | /* | |
2348 | * cifs_readpages requires the server to support a buffer large enough to | |
2349 | * contain the header plus one complete page of data. Otherwise, we need | |
2350 | * to leave cifs_readpages out of the address space operations. | |
2351 | */ | |
f5e54d6e | 2352 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2353 | .readpage = cifs_readpage, |
2354 | .writepage = cifs_writepage, | |
2355 | .writepages = cifs_writepages, | |
d9414774 NP |
2356 | .write_begin = cifs_write_begin, |
2357 | .write_end = cifs_write_end, | |
273d81d6 DK |
2358 | .set_page_dirty = __set_page_dirty_nobuffers, |
2359 | /* .sync_page = cifs_sync_page, */ | |
2360 | /* .direct_IO = */ | |
2361 | }; |