Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 SF |
5 | * |
6 | * Copyright (C) International Business Machines Corp., 2002,2007 | |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
1da177e4 LT |
34 | #include <asm/div64.h> |
35 | #include "cifsfs.h" | |
36 | #include "cifspdu.h" | |
37 | #include "cifsglob.h" | |
38 | #include "cifsproto.h" | |
39 | #include "cifs_unicode.h" | |
40 | #include "cifs_debug.h" | |
41 | #include "cifs_fs_sb.h" | |
42 | ||
1da177e4 LT |
43 | static inline int cifs_convert_flags(unsigned int flags) |
44 | { | |
45 | if ((flags & O_ACCMODE) == O_RDONLY) | |
46 | return GENERIC_READ; | |
47 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
48 | return GENERIC_WRITE; | |
49 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
50 | /* GENERIC_ALL is too much permission to request | |
51 | can cause unnecessary access denied on create */ | |
52 | /* return GENERIC_ALL; */ | |
53 | return (GENERIC_READ | GENERIC_WRITE); | |
54 | } | |
55 | ||
e10f7b55 JL |
56 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
57 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
58 | FILE_READ_DATA); | |
7fc8f4e9 | 59 | } |
e10f7b55 | 60 | |
7fc8f4e9 SF |
61 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
62 | { | |
63 | fmode_t posix_flags = 0; | |
e10f7b55 | 64 | |
7fc8f4e9 SF |
65 | if ((flags & O_ACCMODE) == O_RDONLY) |
66 | posix_flags = FMODE_READ; | |
67 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
68 | posix_flags = FMODE_WRITE; | |
69 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
70 | /* GENERIC_ALL is too much permission to request | |
71 | can cause unnecessary access denied on create */ | |
72 | /* return GENERIC_ALL; */ | |
73 | posix_flags = FMODE_READ | FMODE_WRITE; | |
74 | } | |
75 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
76 | reopening a file. They had their effect on the original open */ | |
77 | if (flags & O_APPEND) | |
78 | posix_flags |= (fmode_t)O_APPEND; | |
79 | if (flags & O_SYNC) | |
80 | posix_flags |= (fmode_t)O_SYNC; | |
81 | if (flags & O_DIRECTORY) | |
82 | posix_flags |= (fmode_t)O_DIRECTORY; | |
83 | if (flags & O_NOFOLLOW) | |
84 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
85 | if (flags & O_DIRECT) | |
86 | posix_flags |= (fmode_t)O_DIRECT; | |
87 | ||
88 | return posix_flags; | |
1da177e4 LT |
89 | } |
90 | ||
91 | static inline int cifs_get_disposition(unsigned int flags) | |
92 | { | |
93 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
94 | return FILE_CREATE; | |
95 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
96 | return FILE_OVERWRITE_IF; | |
97 | else if ((flags & O_CREAT) == O_CREAT) | |
98 | return FILE_OPEN_IF; | |
55aa2e09 SF |
99 | else if ((flags & O_TRUNC) == O_TRUNC) |
100 | return FILE_OVERWRITE; | |
1da177e4 LT |
101 | else |
102 | return FILE_OPEN; | |
103 | } | |
104 | ||
276a74a4 | 105 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
106 | static inline int |
107 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
108 | struct cifsInodeInfo *pCifsInode, | |
109 | struct cifsFileInfo *pCifsFile, __u32 oplock, | |
110 | u16 netfid) | |
276a74a4 | 111 | { |
276a74a4 | 112 | |
276a74a4 | 113 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
114 | |
115 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
116 | if (pCifsInode == NULL) { | |
117 | write_unlock(&GlobalSMBSeslock); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
276a74a4 SF |
121 | if (pCifsInode->clientCanCacheRead) { |
122 | /* we have the inode open somewhere else | |
123 | no need to discard cache data */ | |
124 | goto psx_client_can_cache; | |
125 | } | |
126 | ||
127 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
128 | BB fIX following section BB FIXME */ | |
129 | ||
130 | /* if not oplocked, invalidate inode pages if mtime or file | |
131 | size changed */ | |
132 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
133 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
134 | (file->f_path.dentry->d_inode->i_size == | |
135 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
136 | cFYI(1, ("inode unchanged on server")); | |
137 | } else { | |
138 | if (file->f_path.dentry->d_inode->i_mapping) { | |
139 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
140 | if (rc != 0) | |
141 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
142 | } | |
143 | cFYI(1, ("invalidating remote inode since open detected it " | |
144 | "changed")); | |
145 | invalidate_remote_inode(file->f_path.dentry->d_inode); | |
146 | } */ | |
147 | ||
148 | psx_client_can_cache: | |
149 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
150 | pCifsInode->clientCanCacheAll = true; | |
151 | pCifsInode->clientCanCacheRead = true; | |
152 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
153 | file->f_path.dentry->d_inode)); | |
154 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
155 | pCifsInode->clientCanCacheRead = true; | |
156 | ||
157 | /* will have to change the unlock if we reenable the | |
158 | filemap_fdatawrite (which does not seem necessary */ | |
159 | write_unlock(&GlobalSMBSeslock); | |
160 | return 0; | |
161 | } | |
162 | ||
703a3b8e SF |
163 | static struct cifsFileInfo * |
164 | cifs_fill_filedata(struct file *file) | |
165 | { | |
166 | struct list_head *tmp; | |
167 | struct cifsFileInfo *pCifsFile = NULL; | |
168 | struct cifsInodeInfo *pCifsInode = NULL; | |
169 | ||
170 | /* search inode for this file and fill in file->private_data */ | |
171 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
172 | read_lock(&GlobalSMBSeslock); | |
173 | list_for_each(tmp, &pCifsInode->openFileList) { | |
174 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
175 | if ((pCifsFile->pfile == NULL) && | |
176 | (pCifsFile->pid == current->tgid)) { | |
177 | /* mode set in cifs_create */ | |
178 | ||
179 | /* needed for writepage */ | |
180 | pCifsFile->pfile = file; | |
181 | file->private_data = pCifsFile; | |
182 | break; | |
183 | } | |
184 | } | |
185 | read_unlock(&GlobalSMBSeslock); | |
186 | ||
187 | if (file->private_data != NULL) { | |
188 | return pCifsFile; | |
189 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
190 | cERROR(1, ("could not find file instance for " | |
191 | "new file %p", file)); | |
192 | return NULL; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | /* all arguments to this function must be checked for validity in caller */ |
196 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
197 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
198 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
199 | char *full_path, int xid) | |
200 | { | |
201 | struct timespec temp; | |
202 | int rc; | |
203 | ||
1da177e4 LT |
204 | if (pCifsInode->clientCanCacheRead) { |
205 | /* we have the inode open somewhere else | |
206 | no need to discard cache data */ | |
207 | goto client_can_cache; | |
208 | } | |
209 | ||
210 | /* BB need same check in cifs_create too? */ | |
211 | /* if not oplocked, invalidate inode pages if mtime or file | |
212 | size changed */ | |
07119a4d | 213 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
214 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
215 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
216 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
217 | cFYI(1, ("inode unchanged on server")); | |
218 | } else { | |
e6a00296 | 219 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
220 | /* BB no need to lock inode until after invalidate |
221 | since namei code should already have it locked? */ | |
cea21805 JL |
222 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
223 | if (rc != 0) | |
224 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
225 | } |
226 | cFYI(1, ("invalidating remote inode since open detected it " | |
227 | "changed")); | |
e6a00296 | 228 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
229 | } |
230 | ||
231 | client_can_cache: | |
c18c842b | 232 | if (pTcon->unix_ext) |
e6a00296 | 233 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
234 | full_path, inode->i_sb, xid); |
235 | else | |
e6a00296 | 236 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 237 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
238 | |
239 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
240 | pCifsInode->clientCanCacheAll = true; |
241 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 242 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 243 | file->f_path.dentry->d_inode)); |
1da177e4 | 244 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 245 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
246 | |
247 | return rc; | |
248 | } | |
249 | ||
250 | int cifs_open(struct inode *inode, struct file *file) | |
251 | { | |
252 | int rc = -EACCES; | |
590a3fe0 JL |
253 | int xid; |
254 | __u32 oplock; | |
1da177e4 | 255 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 256 | struct cifsTconInfo *tcon; |
1da177e4 LT |
257 | struct cifsFileInfo *pCifsFile; |
258 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
259 | char *full_path = NULL; |
260 | int desiredAccess; | |
261 | int disposition; | |
262 | __u16 netfid; | |
263 | FILE_ALL_INFO *buf = NULL; | |
264 | ||
265 | xid = GetXid(); | |
266 | ||
267 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 268 | tcon = cifs_sb->tcon; |
1da177e4 | 269 | |
a6ce4932 | 270 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
271 | pCifsFile = cifs_fill_filedata(file); |
272 | if (pCifsFile) { | |
0f3bc09e | 273 | rc = 0; |
a6ce4932 | 274 | FreeXid(xid); |
0f3bc09e | 275 | return rc; |
703a3b8e | 276 | } |
1da177e4 | 277 | |
e6a00296 | 278 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 279 | if (full_path == NULL) { |
0f3bc09e | 280 | rc = -ENOMEM; |
1da177e4 | 281 | FreeXid(xid); |
0f3bc09e | 282 | return rc; |
1da177e4 LT |
283 | } |
284 | ||
7521a3c5 | 285 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 286 | inode, file->f_flags, full_path)); |
276a74a4 SF |
287 | |
288 | if (oplockEnabled) | |
289 | oplock = REQ_OPLOCK; | |
290 | else | |
291 | oplock = 0; | |
292 | ||
64cc2c63 SF |
293 | if (!tcon->broken_posix_open && tcon->unix_ext && |
294 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
295 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
296 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
297 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
298 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 299 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
276a74a4 SF |
300 | cifs_sb->mnt_file_mode /* ignored */, |
301 | oflags, &oplock, &netfid, xid); | |
302 | if (rc == 0) { | |
303 | cFYI(1, ("posix open succeeded")); | |
304 | /* no need for special case handling of setting mode | |
305 | on read only files needed here */ | |
306 | ||
703a3b8e | 307 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
308 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
309 | pCifsFile, oplock, netfid); | |
310 | goto out; | |
64cc2c63 SF |
311 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
312 | if (tcon->ses->serverNOS) | |
313 | cERROR(1, ("server %s of type %s returned" | |
314 | " unexpected error on SMB posix open" | |
315 | ", disabling posix open support." | |
316 | " Check if server update available.", | |
317 | tcon->ses->serverName, | |
318 | tcon->ses->serverNOS)); | |
319 | tcon->broken_posix_open = true; | |
276a74a4 SF |
320 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
321 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
322 | goto out; | |
64cc2c63 SF |
323 | /* else fallthrough to retry open the old way on network i/o |
324 | or DFS errors */ | |
276a74a4 SF |
325 | } |
326 | ||
1da177e4 LT |
327 | desiredAccess = cifs_convert_flags(file->f_flags); |
328 | ||
329 | /********************************************************************* | |
330 | * open flag mapping table: | |
fb8c4b14 | 331 | * |
1da177e4 | 332 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 333 | * ---------- ---------------- |
1da177e4 LT |
334 | * O_CREAT FILE_OPEN_IF |
335 | * O_CREAT | O_EXCL FILE_CREATE | |
336 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
337 | * O_TRUNC FILE_OVERWRITE | |
338 | * none of the above FILE_OPEN | |
339 | * | |
340 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 341 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
342 | * O_CREAT | O_TRUNC is similar but truncates the existing |
343 | * file rather than creating a new file as FILE_SUPERSEDE does | |
344 | * (which uses the attributes / metadata passed in on open call) | |
345 | *? | |
fb8c4b14 | 346 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
347 | *? and the read write flags match reasonably. O_LARGEFILE |
348 | *? is irrelevant because largefile support is always used | |
349 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
350 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
351 | *********************************************************************/ | |
352 | ||
353 | disposition = cifs_get_disposition(file->f_flags); | |
354 | ||
1da177e4 LT |
355 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
356 | ||
357 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
358 | and calling get_inode_info with returned buf (at least helps | |
359 | non-Unix server case) */ | |
360 | ||
fb8c4b14 SF |
361 | /* BB we can not do this if this is the second open of a file |
362 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
363 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
364 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
365 | if (!buf) { | |
366 | rc = -ENOMEM; | |
367 | goto out; | |
368 | } | |
5bafd765 SF |
369 | |
370 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 371 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 372 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
373 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
374 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
375 | else |
376 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
377 | ||
a9d02ad4 SF |
378 | if (rc == -EIO) { |
379 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 380 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
381 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
382 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
383 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
384 | } | |
1da177e4 | 385 | if (rc) { |
26a21b98 | 386 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
387 | goto out; |
388 | } | |
3321b791 | 389 | |
086f68bd JL |
390 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
391 | file->f_flags); | |
392 | file->private_data = pCifsFile; | |
1da177e4 LT |
393 | if (file->private_data == NULL) { |
394 | rc = -ENOMEM; | |
395 | goto out; | |
396 | } | |
1da177e4 | 397 | |
3321b791 JL |
398 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
399 | &oplock, buf, full_path, xid); | |
1da177e4 | 400 | |
fb8c4b14 | 401 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
402 | /* time to set mode which we can not set earlier due to |
403 | problems creating new read-only files */ | |
276a74a4 | 404 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
405 | struct cifs_unix_set_info_args args = { |
406 | .mode = inode->i_mode, | |
407 | .uid = NO_CHANGE_64, | |
408 | .gid = NO_CHANGE_64, | |
409 | .ctime = NO_CHANGE_64, | |
410 | .atime = NO_CHANGE_64, | |
411 | .mtime = NO_CHANGE_64, | |
412 | .device = 0, | |
413 | }; | |
01ea95e3 JL |
414 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
415 | cifs_sb->local_nls, | |
416 | cifs_sb->mnt_cifs_flags & | |
737b758c | 417 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
418 | } |
419 | } | |
420 | ||
421 | out: | |
422 | kfree(buf); | |
423 | kfree(full_path); | |
424 | FreeXid(xid); | |
425 | return rc; | |
426 | } | |
427 | ||
0418726b | 428 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
429 | /* to server was lost */ |
430 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
431 | { | |
432 | int rc = 0; | |
433 | ||
434 | /* BB list all locks open on this file and relock */ | |
435 | ||
436 | return rc; | |
437 | } | |
438 | ||
4b18f2a9 | 439 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
440 | { |
441 | int rc = -EACCES; | |
590a3fe0 JL |
442 | int xid; |
443 | __u32 oplock; | |
1da177e4 | 444 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 445 | struct cifsTconInfo *tcon; |
1da177e4 LT |
446 | struct cifsFileInfo *pCifsFile; |
447 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 448 | struct inode *inode; |
1da177e4 LT |
449 | char *full_path = NULL; |
450 | int desiredAccess; | |
451 | int disposition = FILE_OPEN; | |
452 | __u16 netfid; | |
453 | ||
ad7a2926 | 454 | if (file->private_data) |
1da177e4 | 455 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 456 | else |
1da177e4 LT |
457 | return -EBADF; |
458 | ||
459 | xid = GetXid(); | |
f0a71eb8 | 460 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 461 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 462 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 463 | rc = 0; |
1da177e4 | 464 | FreeXid(xid); |
0f3bc09e | 465 | return rc; |
1da177e4 LT |
466 | } |
467 | ||
e6a00296 | 468 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
469 | cERROR(1, ("no valid name if dentry freed")); |
470 | dump_stack(); | |
471 | rc = -EBADF; | |
472 | goto reopen_error_exit; | |
473 | } | |
474 | ||
475 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 476 | if (inode == NULL) { |
3a9f462f SF |
477 | cERROR(1, ("inode not valid")); |
478 | dump_stack(); | |
479 | rc = -EBADF; | |
480 | goto reopen_error_exit; | |
1da177e4 | 481 | } |
50c2f753 | 482 | |
1da177e4 | 483 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 484 | tcon = cifs_sb->tcon; |
3a9f462f | 485 | |
1da177e4 LT |
486 | /* can not grab rename sem here because various ops, including |
487 | those that already have the rename sem can end up causing writepage | |
488 | to get called and if the server was down that means we end up here, | |
489 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 490 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 491 | if (full_path == NULL) { |
3a9f462f SF |
492 | rc = -ENOMEM; |
493 | reopen_error_exit: | |
f0a71eb8 | 494 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 495 | FreeXid(xid); |
3a9f462f | 496 | return rc; |
1da177e4 LT |
497 | } |
498 | ||
3a9f462f | 499 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 500 | inode, file->f_flags, full_path)); |
1da177e4 LT |
501 | |
502 | if (oplockEnabled) | |
503 | oplock = REQ_OPLOCK; | |
504 | else | |
4b18f2a9 | 505 | oplock = 0; |
1da177e4 | 506 | |
7fc8f4e9 SF |
507 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
508 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
509 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
510 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
511 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 512 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
7fc8f4e9 SF |
513 | cifs_sb->mnt_file_mode /* ignored */, |
514 | oflags, &oplock, &netfid, xid); | |
515 | if (rc == 0) { | |
516 | cFYI(1, ("posix reopen succeeded")); | |
517 | goto reopen_success; | |
518 | } | |
519 | /* fallthrough to retry open the old way on errors, especially | |
520 | in the reconnect path it is important to retry hard */ | |
521 | } | |
522 | ||
523 | desiredAccess = cifs_convert_flags(file->f_flags); | |
524 | ||
1da177e4 | 525 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
526 | by SMBOpen and then calling get_inode_info with returned buf |
527 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
528 | and server version of file size can be stale. If we knew for sure |
529 | that inode was not dirty locally we could do this */ | |
530 | ||
7fc8f4e9 | 531 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 532 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 533 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 534 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 535 | if (rc) { |
f0a71eb8 | 536 | mutex_unlock(&pCifsFile->fh_mutex); |
26a21b98 SF |
537 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
538 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 539 | } else { |
7fc8f4e9 | 540 | reopen_success: |
1da177e4 | 541 | pCifsFile->netfid = netfid; |
4b18f2a9 | 542 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 543 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
544 | pCifsInode = CIFS_I(inode); |
545 | if (pCifsInode) { | |
546 | if (can_flush) { | |
cea21805 JL |
547 | rc = filemap_write_and_wait(inode->i_mapping); |
548 | if (rc != 0) | |
549 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
550 | /* temporarily disable caching while we |
551 | go to server to get inode info */ | |
4b18f2a9 SF |
552 | pCifsInode->clientCanCacheAll = false; |
553 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 554 | if (tcon->unix_ext) |
1da177e4 LT |
555 | rc = cifs_get_inode_info_unix(&inode, |
556 | full_path, inode->i_sb, xid); | |
557 | else | |
558 | rc = cifs_get_inode_info(&inode, | |
559 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 560 | xid, NULL); |
1da177e4 LT |
561 | } /* else we are writing out data to server already |
562 | and could deadlock if we tried to flush data, and | |
563 | since we do not know if we have data that would | |
564 | invalidate the current end of file on the server | |
565 | we can not go to the server to get the new inod | |
566 | info */ | |
567 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
568 | pCifsInode->clientCanCacheAll = true; |
569 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 570 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 571 | file->f_path.dentry->d_inode)); |
1da177e4 | 572 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
573 | pCifsInode->clientCanCacheRead = true; |
574 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 575 | } else { |
4b18f2a9 SF |
576 | pCifsInode->clientCanCacheRead = false; |
577 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
578 | } |
579 | cifs_relock_file(pCifsFile); | |
580 | } | |
581 | } | |
1da177e4 LT |
582 | kfree(full_path); |
583 | FreeXid(xid); | |
584 | return rc; | |
585 | } | |
586 | ||
587 | int cifs_close(struct inode *inode, struct file *file) | |
588 | { | |
589 | int rc = 0; | |
15745320 | 590 | int xid, timeout; |
1da177e4 LT |
591 | struct cifs_sb_info *cifs_sb; |
592 | struct cifsTconInfo *pTcon; | |
593 | struct cifsFileInfo *pSMBFile = | |
594 | (struct cifsFileInfo *)file->private_data; | |
595 | ||
596 | xid = GetXid(); | |
597 | ||
598 | cifs_sb = CIFS_SB(inode->i_sb); | |
599 | pTcon = cifs_sb->tcon; | |
600 | if (pSMBFile) { | |
7ee1af76 | 601 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 602 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 603 | pSMBFile->closePend = true; |
1da177e4 LT |
604 | if (pTcon) { |
605 | /* no sense reconnecting to close a file that is | |
606 | already closed */ | |
3b795210 | 607 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 608 | write_unlock(&GlobalSMBSeslock); |
15745320 | 609 | timeout = 2; |
6ab409b5 | 610 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 611 | && (timeout <= 2048)) { |
23e7dd7d SF |
612 | /* Give write a better chance to get to |
613 | server ahead of the close. We do not | |
614 | want to add a wait_q here as it would | |
615 | increase the memory utilization as | |
616 | the struct would be in each open file, | |
fb8c4b14 | 617 | but this should give enough time to |
23e7dd7d | 618 | clear the socket */ |
90c81e0b SF |
619 | cFYI(DBG2, |
620 | ("close delay, write pending")); | |
23e7dd7d SF |
621 | msleep(timeout); |
622 | timeout *= 4; | |
4891d539 | 623 | } |
ddb4cbfc SF |
624 | if (!pTcon->need_reconnect && |
625 | !pSMBFile->invalidHandle) | |
626 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 627 | pSMBFile->netfid); |
ddb4cbfc SF |
628 | } else |
629 | write_unlock(&GlobalSMBSeslock); | |
630 | } else | |
631 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
632 | |
633 | /* Delete any outstanding lock records. | |
634 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 635 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
636 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
637 | list_del(&li->llist); | |
638 | kfree(li); | |
639 | } | |
796e5661 | 640 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 641 | |
cbe0476f | 642 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
643 | list_del(&pSMBFile->flist); |
644 | list_del(&pSMBFile->tlist); | |
cbe0476f | 645 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 646 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
647 | file->private_data = NULL; |
648 | } else | |
649 | rc = -EBADF; | |
650 | ||
4efa53f0 | 651 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
652 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
653 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
654 | /* if the file is not open we do not know if we can cache info | |
655 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
656 | CIFS_I(inode)->clientCanCacheRead = false; |
657 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 658 | } |
4efa53f0 | 659 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 660 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
661 | rc = CIFS_I(inode)->write_behind_rc; |
662 | FreeXid(xid); | |
663 | return rc; | |
664 | } | |
665 | ||
666 | int cifs_closedir(struct inode *inode, struct file *file) | |
667 | { | |
668 | int rc = 0; | |
669 | int xid; | |
670 | struct cifsFileInfo *pCFileStruct = | |
671 | (struct cifsFileInfo *)file->private_data; | |
672 | char *ptmp; | |
673 | ||
26a21b98 | 674 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
675 | |
676 | xid = GetXid(); | |
677 | ||
678 | if (pCFileStruct) { | |
679 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
680 | struct cifs_sb_info *cifs_sb = |
681 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
682 | |
683 | pTcon = cifs_sb->tcon; | |
684 | ||
685 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 686 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
687 | if (!pCFileStruct->srch_inf.endOfSearch && |
688 | !pCFileStruct->invalidHandle) { | |
689 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 690 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
691 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
692 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
693 | rc)); | |
694 | /* not much we can do if it fails anyway, ignore rc */ | |
695 | rc = 0; | |
ddb4cbfc SF |
696 | } else |
697 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
698 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
699 | if (ptmp) { | |
ec637e3f | 700 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 701 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 702 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
703 | cifs_small_buf_release(ptmp); |
704 | else | |
705 | cifs_buf_release(ptmp); | |
1da177e4 | 706 | } |
1da177e4 LT |
707 | kfree(file->private_data); |
708 | file->private_data = NULL; | |
709 | } | |
710 | /* BB can we lock the filestruct while this is going on? */ | |
711 | FreeXid(xid); | |
712 | return rc; | |
713 | } | |
714 | ||
7ee1af76 JA |
715 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
716 | __u64 offset, __u8 lockType) | |
717 | { | |
fb8c4b14 SF |
718 | struct cifsLockInfo *li = |
719 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
720 | if (li == NULL) |
721 | return -ENOMEM; | |
722 | li->offset = offset; | |
723 | li->length = len; | |
724 | li->type = lockType; | |
796e5661 | 725 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 726 | list_add(&li->llist, &fid->llist); |
796e5661 | 727 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
728 | return 0; |
729 | } | |
730 | ||
1da177e4 LT |
731 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
732 | { | |
733 | int rc, xid; | |
1da177e4 LT |
734 | __u32 numLock = 0; |
735 | __u32 numUnlock = 0; | |
736 | __u64 length; | |
4b18f2a9 | 737 | bool wait_flag = false; |
1da177e4 | 738 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 739 | struct cifsTconInfo *tcon; |
08547b03 SF |
740 | __u16 netfid; |
741 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 742 | bool posix_locking = 0; |
1da177e4 LT |
743 | |
744 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
745 | rc = -EACCES; | |
746 | xid = GetXid(); | |
747 | ||
748 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
749 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
750 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
751 | pfLock->fl_end)); | |
1da177e4 LT |
752 | |
753 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 754 | cFYI(1, ("Posix")); |
1da177e4 | 755 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 756 | cFYI(1, ("Flock")); |
1da177e4 | 757 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 758 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 759 | wait_flag = true; |
1da177e4 LT |
760 | } |
761 | if (pfLock->fl_flags & FL_ACCESS) | |
762 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 763 | "not implemented yet")); |
1da177e4 LT |
764 | if (pfLock->fl_flags & FL_LEASE) |
765 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 766 | if (pfLock->fl_flags & |
1da177e4 LT |
767 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
768 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
769 | ||
770 | if (pfLock->fl_type == F_WRLCK) { | |
771 | cFYI(1, ("F_WRLCK ")); | |
772 | numLock = 1; | |
773 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 774 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 775 | numUnlock = 1; |
d47d7c1a SF |
776 | /* Check if unlock includes more than |
777 | one lock range */ | |
1da177e4 | 778 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 779 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
780 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
781 | numLock = 1; | |
782 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 783 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
784 | numLock = 1; |
785 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 786 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
787 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
788 | numLock = 1; | |
789 | } else | |
d47d7c1a | 790 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 791 | |
e6a00296 | 792 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 793 | tcon = cifs_sb->tcon; |
1da177e4 LT |
794 | |
795 | if (file->private_data == NULL) { | |
0f3bc09e | 796 | rc = -EBADF; |
1da177e4 | 797 | FreeXid(xid); |
0f3bc09e | 798 | return rc; |
1da177e4 | 799 | } |
08547b03 SF |
800 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
801 | ||
13a6e42a SF |
802 | if ((tcon->ses->capabilities & CAP_UNIX) && |
803 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 804 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 805 | posix_locking = 1; |
08547b03 SF |
806 | /* BB add code here to normalize offset and length to |
807 | account for negative length which we can not accept over the | |
808 | wire */ | |
1da177e4 | 809 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 810 | if (posix_locking) { |
08547b03 | 811 | int posix_lock_type; |
fb8c4b14 | 812 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
813 | posix_lock_type = CIFS_RDLCK; |
814 | else | |
815 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 816 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 817 | length, pfLock, |
08547b03 SF |
818 | posix_lock_type, wait_flag); |
819 | FreeXid(xid); | |
820 | return rc; | |
821 | } | |
822 | ||
823 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 824 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 825 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 826 | if (rc == 0) { |
13a6e42a | 827 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
828 | pfLock->fl_start, 1 /* numUnlock */ , |
829 | 0 /* numLock */ , lockType, | |
830 | 0 /* wait flag */ ); | |
831 | pfLock->fl_type = F_UNLCK; | |
832 | if (rc != 0) | |
833 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 834 | "range %d during test of lock", rc)); |
1da177e4 LT |
835 | rc = 0; |
836 | ||
837 | } else { | |
838 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
839 | rc = 0; /* do not change lock type to unlock | |
840 | since range in use */ | |
841 | } | |
842 | ||
843 | FreeXid(xid); | |
844 | return rc; | |
845 | } | |
7ee1af76 JA |
846 | |
847 | if (!numLock && !numUnlock) { | |
848 | /* if no lock or unlock then nothing | |
849 | to do since we do not know what it is */ | |
850 | FreeXid(xid); | |
851 | return -EOPNOTSUPP; | |
852 | } | |
853 | ||
854 | if (posix_locking) { | |
08547b03 | 855 | int posix_lock_type; |
fb8c4b14 | 856 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
857 | posix_lock_type = CIFS_RDLCK; |
858 | else | |
859 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 860 | |
fb8c4b14 | 861 | if (numUnlock == 1) |
beb84dc8 | 862 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 863 | |
13a6e42a | 864 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 865 | length, pfLock, |
08547b03 | 866 | posix_lock_type, wait_flag); |
7ee1af76 | 867 | } else { |
fb8c4b14 SF |
868 | struct cifsFileInfo *fid = |
869 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
870 | |
871 | if (numLock) { | |
13a6e42a | 872 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 873 | pfLock->fl_start, |
7ee1af76 JA |
874 | 0, numLock, lockType, wait_flag); |
875 | ||
876 | if (rc == 0) { | |
877 | /* For Windows locks we must store them. */ | |
878 | rc = store_file_lock(fid, length, | |
879 | pfLock->fl_start, lockType); | |
880 | } | |
881 | } else if (numUnlock) { | |
882 | /* For each stored lock that this unlock overlaps | |
883 | completely, unlock it. */ | |
884 | int stored_rc = 0; | |
885 | struct cifsLockInfo *li, *tmp; | |
886 | ||
6b70c955 | 887 | rc = 0; |
796e5661 | 888 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
889 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
890 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 891 | (pfLock->fl_start + length) >= |
39db810c | 892 | (li->offset + li->length)) { |
13a6e42a | 893 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 894 | netfid, |
7ee1af76 | 895 | li->length, li->offset, |
4b18f2a9 | 896 | 1, 0, li->type, false); |
7ee1af76 JA |
897 | if (stored_rc) |
898 | rc = stored_rc; | |
899 | ||
900 | list_del(&li->llist); | |
901 | kfree(li); | |
902 | } | |
903 | } | |
796e5661 | 904 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
905 | } |
906 | } | |
907 | ||
d634cc15 | 908 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
909 | posix_lock_file_wait(file, pfLock); |
910 | FreeXid(xid); | |
911 | return rc; | |
912 | } | |
913 | ||
fbec9ab9 JL |
914 | /* |
915 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
916 | * these calls can be very long. | |
917 | * | |
918 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
919 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
920 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
921 | * welcome if someone wants to suggest one. | |
922 | * | |
923 | * We may be able to do a better job with this if there were some way to | |
924 | * declare that a file should be sparse. | |
925 | */ | |
926 | static int | |
927 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
928 | { | |
929 | if (offset <= cifsi->server_eof) | |
930 | return CIFS_STD_OP; | |
931 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
932 | return CIFS_VLONG_OP; | |
933 | else | |
934 | return CIFS_LONG_OP; | |
935 | } | |
936 | ||
937 | /* update the file size (if needed) after a write */ | |
938 | static void | |
939 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
940 | unsigned int bytes_written) | |
941 | { | |
942 | loff_t end_of_write = offset + bytes_written; | |
943 | ||
944 | if (end_of_write > cifsi->server_eof) | |
945 | cifsi->server_eof = end_of_write; | |
946 | } | |
947 | ||
1da177e4 LT |
948 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
949 | size_t write_size, loff_t *poffset) | |
950 | { | |
951 | int rc = 0; | |
952 | unsigned int bytes_written = 0; | |
953 | unsigned int total_written; | |
954 | struct cifs_sb_info *cifs_sb; | |
955 | struct cifsTconInfo *pTcon; | |
956 | int xid, long_op; | |
957 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 958 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 959 | |
e6a00296 | 960 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
961 | |
962 | pTcon = cifs_sb->tcon; | |
963 | ||
964 | /* cFYI(1, | |
965 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 966 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
967 | |
968 | if (file->private_data == NULL) | |
969 | return -EBADF; | |
c33f8d32 | 970 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 971 | |
838726c4 JL |
972 | rc = generic_write_checks(file, poffset, &write_size, 0); |
973 | if (rc) | |
974 | return rc; | |
975 | ||
1da177e4 | 976 | xid = GetXid(); |
1da177e4 | 977 | |
fbec9ab9 | 978 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
979 | for (total_written = 0; write_size > total_written; |
980 | total_written += bytes_written) { | |
981 | rc = -EAGAIN; | |
982 | while (rc == -EAGAIN) { | |
983 | if (file->private_data == NULL) { | |
984 | /* file has been closed on us */ | |
985 | FreeXid(xid); | |
986 | /* if we have gotten here we have written some data | |
987 | and blocked, and the file has been freed on us while | |
988 | we blocked so return what we managed to write */ | |
989 | return total_written; | |
fb8c4b14 | 990 | } |
1da177e4 LT |
991 | if (open_file->closePend) { |
992 | FreeXid(xid); | |
993 | if (total_written) | |
994 | return total_written; | |
995 | else | |
996 | return -EBADF; | |
997 | } | |
998 | if (open_file->invalidHandle) { | |
1da177e4 LT |
999 | /* we could deadlock if we called |
1000 | filemap_fdatawait from here so tell | |
1001 | reopen_file not to flush data to server | |
1002 | now */ | |
4b18f2a9 | 1003 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1004 | if (rc != 0) |
1005 | break; | |
1006 | } | |
1007 | ||
1008 | rc = CIFSSMBWrite(xid, pTcon, | |
1009 | open_file->netfid, | |
1010 | min_t(const int, cifs_sb->wsize, | |
1011 | write_size - total_written), | |
1012 | *poffset, &bytes_written, | |
1013 | NULL, write_data + total_written, long_op); | |
1014 | } | |
1015 | if (rc || (bytes_written == 0)) { | |
1016 | if (total_written) | |
1017 | break; | |
1018 | else { | |
1019 | FreeXid(xid); | |
1020 | return rc; | |
1021 | } | |
fbec9ab9 JL |
1022 | } else { |
1023 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1024 | *poffset += bytes_written; |
fbec9ab9 | 1025 | } |
133672ef | 1026 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1027 | 15 seconds is plenty */ |
1028 | } | |
1029 | ||
a4544347 | 1030 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1031 | |
1032 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1033 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1034 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1035 | /* Do not update local mtime - server will set its actual value on write |
1036 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1037 | * current_fs_time(inode->i_sb);*/ |
1038 | if (total_written > 0) { | |
1039 | spin_lock(&inode->i_lock); | |
1040 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1041 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1042 | *poffset); |
3677db10 | 1043 | spin_unlock(&inode->i_lock); |
1da177e4 | 1044 | } |
fb8c4b14 | 1045 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1046 | } |
1047 | FreeXid(xid); | |
1048 | return total_written; | |
1049 | } | |
1050 | ||
1051 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1052 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1053 | { |
1054 | int rc = 0; | |
1055 | unsigned int bytes_written = 0; | |
1056 | unsigned int total_written; | |
1057 | struct cifs_sb_info *cifs_sb; | |
1058 | struct cifsTconInfo *pTcon; | |
1059 | int xid, long_op; | |
1060 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1061 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1062 | |
e6a00296 | 1063 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1064 | |
1065 | pTcon = cifs_sb->tcon; | |
1066 | ||
fb8c4b14 | 1067 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1068 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1069 | |
1070 | if (file->private_data == NULL) | |
1071 | return -EBADF; | |
c33f8d32 | 1072 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1073 | |
1da177e4 | 1074 | xid = GetXid(); |
1da177e4 | 1075 | |
fbec9ab9 | 1076 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1077 | for (total_written = 0; write_size > total_written; |
1078 | total_written += bytes_written) { | |
1079 | rc = -EAGAIN; | |
1080 | while (rc == -EAGAIN) { | |
1081 | if (file->private_data == NULL) { | |
1082 | /* file has been closed on us */ | |
1083 | FreeXid(xid); | |
1084 | /* if we have gotten here we have written some data | |
1085 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1086 | while we blocked so return what we managed to |
1da177e4 LT |
1087 | write */ |
1088 | return total_written; | |
fb8c4b14 | 1089 | } |
1da177e4 LT |
1090 | if (open_file->closePend) { |
1091 | FreeXid(xid); | |
1092 | if (total_written) | |
1093 | return total_written; | |
1094 | else | |
1095 | return -EBADF; | |
1096 | } | |
1097 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1098 | /* we could deadlock if we called |
1099 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1100 | reopen_file not to flush data to |
1da177e4 | 1101 | server now */ |
4b18f2a9 | 1102 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1103 | if (rc != 0) |
1104 | break; | |
1105 | } | |
fb8c4b14 SF |
1106 | if (experimEnabled || (pTcon->ses->server && |
1107 | ((pTcon->ses->server->secMode & | |
08775834 | 1108 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1109 | == 0))) { |
3e84469d SF |
1110 | struct kvec iov[2]; |
1111 | unsigned int len; | |
1112 | ||
0ae0efad | 1113 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1114 | write_size - total_written); |
1115 | /* iov[0] is reserved for smb header */ | |
1116 | iov[1].iov_base = (char *)write_data + | |
1117 | total_written; | |
1118 | iov[1].iov_len = len; | |
d6e04ae6 | 1119 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1120 | open_file->netfid, len, |
d6e04ae6 | 1121 | *poffset, &bytes_written, |
3e84469d | 1122 | iov, 1, long_op); |
d6e04ae6 | 1123 | } else |
60808233 SF |
1124 | rc = CIFSSMBWrite(xid, pTcon, |
1125 | open_file->netfid, | |
1126 | min_t(const int, cifs_sb->wsize, | |
1127 | write_size - total_written), | |
1128 | *poffset, &bytes_written, | |
1129 | write_data + total_written, | |
1130 | NULL, long_op); | |
1da177e4 LT |
1131 | } |
1132 | if (rc || (bytes_written == 0)) { | |
1133 | if (total_written) | |
1134 | break; | |
1135 | else { | |
1136 | FreeXid(xid); | |
1137 | return rc; | |
1138 | } | |
fbec9ab9 JL |
1139 | } else { |
1140 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1141 | *poffset += bytes_written; |
fbec9ab9 | 1142 | } |
133672ef | 1143 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1144 | 15 seconds is plenty */ |
1145 | } | |
1146 | ||
a4544347 | 1147 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1148 | |
1149 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1150 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1151 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1152 | /* file->f_path.dentry->d_inode->i_ctime = |
1153 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1154 | if (total_written > 0) { | |
1155 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1156 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1157 | i_size_write(file->f_path.dentry->d_inode, | |
1158 | *poffset); | |
1159 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1160 | } |
3677db10 | 1161 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1162 | } |
1163 | FreeXid(xid); | |
1164 | return total_written; | |
1165 | } | |
1166 | ||
630f3f0c SF |
1167 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1168 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1169 | { | |
1170 | struct cifsFileInfo *open_file = NULL; | |
1171 | ||
1172 | read_lock(&GlobalSMBSeslock); | |
1173 | /* we could simply get the first_list_entry since write-only entries | |
1174 | are always at the end of the list but since the first entry might | |
1175 | have a close pending, we go through the whole list */ | |
1176 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1177 | if (open_file->closePend) | |
1178 | continue; | |
1179 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1180 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1181 | if (!open_file->invalidHandle) { | |
1182 | /* found a good file */ | |
1183 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1184 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1185 | read_unlock(&GlobalSMBSeslock); |
1186 | return open_file; | |
1187 | } /* else might as well continue, and look for | |
1188 | another, or simply have the caller reopen it | |
1189 | again rather than trying to fix this handle */ | |
1190 | } else /* write only file */ | |
1191 | break; /* write only files are last so must be done */ | |
1192 | } | |
1193 | read_unlock(&GlobalSMBSeslock); | |
1194 | return NULL; | |
1195 | } | |
1196 | #endif | |
1197 | ||
dd99cd80 | 1198 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1199 | { |
1200 | struct cifsFileInfo *open_file; | |
2846d386 | 1201 | bool any_available = false; |
dd99cd80 | 1202 | int rc; |
6148a742 | 1203 | |
60808233 SF |
1204 | /* Having a null inode here (because mapping->host was set to zero by |
1205 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1206 | it being zero) during stress testcases so we need to check for it */ | |
1207 | ||
fb8c4b14 SF |
1208 | if (cifs_inode == NULL) { |
1209 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1210 | dump_stack(); |
1211 | return NULL; | |
1212 | } | |
1213 | ||
6148a742 | 1214 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1215 | refind_writable: |
6148a742 | 1216 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1217 | if (open_file->closePend || |
1218 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1219 | continue; |
2846d386 | 1220 | |
6148a742 SF |
1221 | if (open_file->pfile && |
1222 | ((open_file->pfile->f_flags & O_RDWR) || | |
1223 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1224 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1225 | |
1226 | if (!open_file->invalidHandle) { | |
1227 | /* found a good writable file */ | |
1228 | read_unlock(&GlobalSMBSeslock); | |
1229 | return open_file; | |
1230 | } | |
8840dee9 | 1231 | |
6148a742 | 1232 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1233 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1234 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1235 | if (!rc) { |
9b22b0b7 SF |
1236 | if (!open_file->closePend) |
1237 | return open_file; | |
1238 | else { /* start over in case this was deleted */ | |
1239 | /* since the list could be modified */ | |
37c0eb46 | 1240 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1241 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1242 | goto refind_writable; |
37c0eb46 SF |
1243 | } |
1244 | } | |
9b22b0b7 SF |
1245 | |
1246 | /* if it fails, try another handle if possible - | |
1247 | (we can not do this if closePending since | |
1248 | loop could be modified - in which case we | |
1249 | have to start at the beginning of the list | |
1250 | again. Note that it would be bad | |
1251 | to hold up writepages here (rather than | |
1252 | in caller) with continuous retries */ | |
1253 | cFYI(1, ("wp failed on reopen file")); | |
1254 | read_lock(&GlobalSMBSeslock); | |
1255 | /* can not use this handle, no write | |
1256 | pending on this one after all */ | |
6ab409b5 | 1257 | cifsFileInfo_put(open_file); |
8840dee9 | 1258 | |
9b22b0b7 SF |
1259 | if (open_file->closePend) /* list could have changed */ |
1260 | goto refind_writable; | |
1261 | /* else we simply continue to the next entry. Thus | |
1262 | we do not loop on reopen errors. If we | |
1263 | can not reopen the file, for example if we | |
1264 | reconnected to a server with another client | |
1265 | racing to delete or lock the file we would not | |
1266 | make progress if we restarted before the beginning | |
1267 | of the loop here. */ | |
6148a742 SF |
1268 | } |
1269 | } | |
2846d386 JL |
1270 | /* couldn't find useable FH with same pid, try any available */ |
1271 | if (!any_available) { | |
1272 | any_available = true; | |
1273 | goto refind_writable; | |
1274 | } | |
6148a742 SF |
1275 | read_unlock(&GlobalSMBSeslock); |
1276 | return NULL; | |
1277 | } | |
1278 | ||
1da177e4 LT |
1279 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1280 | { | |
1281 | struct address_space *mapping = page->mapping; | |
1282 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1283 | char *write_data; | |
1284 | int rc = -EFAULT; | |
1285 | int bytes_written = 0; | |
1286 | struct cifs_sb_info *cifs_sb; | |
1287 | struct cifsTconInfo *pTcon; | |
1288 | struct inode *inode; | |
6148a742 | 1289 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1290 | |
1291 | if (!mapping || !mapping->host) | |
1292 | return -EFAULT; | |
1293 | ||
1294 | inode = page->mapping->host; | |
1295 | cifs_sb = CIFS_SB(inode->i_sb); | |
1296 | pTcon = cifs_sb->tcon; | |
1297 | ||
1298 | offset += (loff_t)from; | |
1299 | write_data = kmap(page); | |
1300 | write_data += from; | |
1301 | ||
1302 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1303 | kunmap(page); | |
1304 | return -EIO; | |
1305 | } | |
1306 | ||
1307 | /* racing with truncate? */ | |
1308 | if (offset > mapping->host->i_size) { | |
1309 | kunmap(page); | |
1310 | return 0; /* don't care */ | |
1311 | } | |
1312 | ||
1313 | /* check to make sure that we are not extending the file */ | |
1314 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1315 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1316 | |
6148a742 SF |
1317 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1318 | if (open_file) { | |
1319 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1320 | to-from, &offset); | |
6ab409b5 | 1321 | cifsFileInfo_put(open_file); |
1da177e4 | 1322 | /* Does mm or vfs already set times? */ |
6148a742 | 1323 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1324 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1325 | rc = 0; |
bb5a9a04 SF |
1326 | else if (bytes_written < 0) |
1327 | rc = bytes_written; | |
6148a742 | 1328 | } else { |
1da177e4 LT |
1329 | cFYI(1, ("No writeable filehandles for inode")); |
1330 | rc = -EIO; | |
1331 | } | |
1332 | ||
1333 | kunmap(page); | |
1334 | return rc; | |
1335 | } | |
1336 | ||
1da177e4 | 1337 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1338 | struct writeback_control *wbc) |
1da177e4 | 1339 | { |
37c0eb46 SF |
1340 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1341 | unsigned int bytes_to_write; | |
1342 | unsigned int bytes_written; | |
1343 | struct cifs_sb_info *cifs_sb; | |
1344 | int done = 0; | |
111ebb6e | 1345 | pgoff_t end; |
37c0eb46 | 1346 | pgoff_t index; |
fb8c4b14 SF |
1347 | int range_whole = 0; |
1348 | struct kvec *iov; | |
84d2f07e | 1349 | int len; |
37c0eb46 SF |
1350 | int n_iov = 0; |
1351 | pgoff_t next; | |
1352 | int nr_pages; | |
1353 | __u64 offset = 0; | |
23e7dd7d | 1354 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1355 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1356 | struct page *page; |
1357 | struct pagevec pvec; | |
1358 | int rc = 0; | |
1359 | int scanned = 0; | |
fbec9ab9 | 1360 | int xid, long_op; |
1da177e4 | 1361 | |
37c0eb46 | 1362 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1363 | |
37c0eb46 SF |
1364 | /* |
1365 | * If wsize is smaller that the page cache size, default to writing | |
1366 | * one page at a time via cifs_writepage | |
1367 | */ | |
1368 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1369 | return generic_writepages(mapping, wbc); | |
1370 | ||
fb8c4b14 SF |
1371 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1372 | if (cifs_sb->tcon->ses->server->secMode & | |
1373 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1374 | if (!experimEnabled) | |
60808233 | 1375 | return generic_writepages(mapping, wbc); |
4a77118c | 1376 | |
9a0c8230 | 1377 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1378 | if (iov == NULL) |
9a0c8230 SF |
1379 | return generic_writepages(mapping, wbc); |
1380 | ||
1381 | ||
37c0eb46 SF |
1382 | /* |
1383 | * BB: Is this meaningful for a non-block-device file system? | |
1384 | * If it is, we should test it again after we do I/O | |
1385 | */ | |
1386 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1387 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1388 | kfree(iov); |
37c0eb46 SF |
1389 | return 0; |
1390 | } | |
1391 | ||
1da177e4 LT |
1392 | xid = GetXid(); |
1393 | ||
37c0eb46 | 1394 | pagevec_init(&pvec, 0); |
111ebb6e | 1395 | if (wbc->range_cyclic) { |
37c0eb46 | 1396 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1397 | end = -1; |
1398 | } else { | |
1399 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1400 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1401 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1402 | range_whole = 1; | |
37c0eb46 SF |
1403 | scanned = 1; |
1404 | } | |
1405 | retry: | |
1406 | while (!done && (index <= end) && | |
1407 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1408 | PAGECACHE_TAG_DIRTY, | |
1409 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1410 | int first; | |
1411 | unsigned int i; | |
1412 | ||
37c0eb46 SF |
1413 | first = -1; |
1414 | next = 0; | |
1415 | n_iov = 0; | |
1416 | bytes_to_write = 0; | |
1417 | ||
1418 | for (i = 0; i < nr_pages; i++) { | |
1419 | page = pvec.pages[i]; | |
1420 | /* | |
1421 | * At this point we hold neither mapping->tree_lock nor | |
1422 | * lock on the page itself: the page may be truncated or | |
1423 | * invalidated (changing page->mapping to NULL), or even | |
1424 | * swizzled back from swapper_space to tmpfs file | |
1425 | * mapping | |
1426 | */ | |
1427 | ||
1428 | if (first < 0) | |
1429 | lock_page(page); | |
529ae9aa | 1430 | else if (!trylock_page(page)) |
37c0eb46 SF |
1431 | break; |
1432 | ||
1433 | if (unlikely(page->mapping != mapping)) { | |
1434 | unlock_page(page); | |
1435 | break; | |
1436 | } | |
1437 | ||
111ebb6e | 1438 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1439 | done = 1; |
1440 | unlock_page(page); | |
1441 | break; | |
1442 | } | |
1443 | ||
1444 | if (next && (page->index != next)) { | |
1445 | /* Not next consecutive page */ | |
1446 | unlock_page(page); | |
1447 | break; | |
1448 | } | |
1449 | ||
1450 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1451 | wait_on_page_writeback(page); | |
1452 | ||
1453 | if (PageWriteback(page) || | |
cb876f45 | 1454 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1455 | unlock_page(page); |
1456 | break; | |
1457 | } | |
84d2f07e | 1458 | |
cb876f45 LT |
1459 | /* |
1460 | * This actually clears the dirty bit in the radix tree. | |
1461 | * See cifs_writepage() for more commentary. | |
1462 | */ | |
1463 | set_page_writeback(page); | |
1464 | ||
84d2f07e SF |
1465 | if (page_offset(page) >= mapping->host->i_size) { |
1466 | done = 1; | |
1467 | unlock_page(page); | |
cb876f45 | 1468 | end_page_writeback(page); |
84d2f07e SF |
1469 | break; |
1470 | } | |
1471 | ||
37c0eb46 SF |
1472 | /* |
1473 | * BB can we get rid of this? pages are held by pvec | |
1474 | */ | |
1475 | page_cache_get(page); | |
1476 | ||
84d2f07e SF |
1477 | len = min(mapping->host->i_size - page_offset(page), |
1478 | (loff_t)PAGE_CACHE_SIZE); | |
1479 | ||
37c0eb46 SF |
1480 | /* reserve iov[0] for the smb header */ |
1481 | n_iov++; | |
1482 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1483 | iov[n_iov].iov_len = len; |
1484 | bytes_to_write += len; | |
37c0eb46 SF |
1485 | |
1486 | if (first < 0) { | |
1487 | first = i; | |
1488 | offset = page_offset(page); | |
1489 | } | |
1490 | next = page->index + 1; | |
1491 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1492 | break; | |
1493 | } | |
1494 | if (n_iov) { | |
23e7dd7d SF |
1495 | /* Search for a writable handle every time we call |
1496 | * CIFSSMBWrite2. We can't rely on the last handle | |
1497 | * we used to still be valid | |
1498 | */ | |
1499 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1500 | if (!open_file) { | |
1501 | cERROR(1, ("No writable handles for inode")); | |
1502 | rc = -EBADF; | |
1047abc1 | 1503 | } else { |
fbec9ab9 | 1504 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1505 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1506 | open_file->netfid, | |
1507 | bytes_to_write, offset, | |
1508 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1509 | long_op); |
6ab409b5 | 1510 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1511 | cifs_update_eof(cifsi, offset, bytes_written); |
1512 | ||
23e7dd7d | 1513 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1514 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1515 | rc, bytes_written)); |
1516 | /* BB what if continued retry is | |
1517 | requested via mount flags? */ | |
cea21805 JL |
1518 | if (rc == -ENOSPC) |
1519 | set_bit(AS_ENOSPC, &mapping->flags); | |
1520 | else | |
1521 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1522 | } else { |
1523 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1524 | bytes_written); | |
1525 | } | |
37c0eb46 SF |
1526 | } |
1527 | for (i = 0; i < n_iov; i++) { | |
1528 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1529 | /* Should we also set page error on |
1530 | success rc but too little data written? */ | |
1531 | /* BB investigate retry logic on temporary | |
1532 | server crash cases and how recovery works | |
fb8c4b14 SF |
1533 | when page marked as error */ |
1534 | if (rc) | |
eb9bdaa3 | 1535 | SetPageError(page); |
37c0eb46 SF |
1536 | kunmap(page); |
1537 | unlock_page(page); | |
cb876f45 | 1538 | end_page_writeback(page); |
37c0eb46 SF |
1539 | page_cache_release(page); |
1540 | } | |
1541 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1542 | done = 1; | |
1543 | index = next; | |
b066a48c DK |
1544 | } else |
1545 | /* Need to re-find the pages we skipped */ | |
1546 | index = pvec.pages[0]->index + 1; | |
1547 | ||
37c0eb46 SF |
1548 | pagevec_release(&pvec); |
1549 | } | |
1550 | if (!scanned && !done) { | |
1551 | /* | |
1552 | * We hit the last page and there is more work to be done: wrap | |
1553 | * back to the start of the file | |
1554 | */ | |
1555 | scanned = 1; | |
1556 | index = 0; | |
1557 | goto retry; | |
1558 | } | |
111ebb6e | 1559 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1560 | mapping->writeback_index = index; |
1561 | ||
1da177e4 | 1562 | FreeXid(xid); |
9a0c8230 | 1563 | kfree(iov); |
1da177e4 LT |
1564 | return rc; |
1565 | } | |
1da177e4 | 1566 | |
fb8c4b14 | 1567 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1568 | { |
1569 | int rc = -EFAULT; | |
1570 | int xid; | |
1571 | ||
1572 | xid = GetXid(); | |
1573 | /* BB add check for wbc flags */ | |
1574 | page_cache_get(page); | |
ad7a2926 | 1575 | if (!PageUptodate(page)) |
1da177e4 | 1576 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1577 | |
1578 | /* | |
1579 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1580 | * | |
1581 | * A writepage() implementation always needs to do either this, | |
1582 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1583 | * the case of a failure. | |
1584 | * | |
1585 | * Just unlocking the page will cause the radix tree tag-bits | |
1586 | * to fail to update with the state of the page correctly. | |
1587 | */ | |
fb8c4b14 | 1588 | set_page_writeback(page); |
1da177e4 LT |
1589 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1590 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1591 | unlock_page(page); | |
cb876f45 LT |
1592 | end_page_writeback(page); |
1593 | page_cache_release(page); | |
1da177e4 LT |
1594 | FreeXid(xid); |
1595 | return rc; | |
1596 | } | |
1597 | ||
d9414774 NP |
1598 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1599 | loff_t pos, unsigned len, unsigned copied, | |
1600 | struct page *page, void *fsdata) | |
1da177e4 | 1601 | { |
d9414774 NP |
1602 | int rc; |
1603 | struct inode *inode = mapping->host; | |
1da177e4 | 1604 | |
d9414774 NP |
1605 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1606 | page, pos, copied)); | |
1607 | ||
a98ee8c1 JL |
1608 | if (PageChecked(page)) { |
1609 | if (copied == len) | |
1610 | SetPageUptodate(page); | |
1611 | ClearPageChecked(page); | |
1612 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1613 | SetPageUptodate(page); |
ad7a2926 | 1614 | |
1da177e4 | 1615 | if (!PageUptodate(page)) { |
d9414774 NP |
1616 | char *page_data; |
1617 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1618 | int xid; | |
1619 | ||
1620 | xid = GetXid(); | |
1da177e4 LT |
1621 | /* this is probably better than directly calling |
1622 | partialpage_write since in this function the file handle is | |
1623 | known which we might as well leverage */ | |
1624 | /* BB check if anything else missing out of ppw | |
1625 | such as updating last write time */ | |
1626 | page_data = kmap(page); | |
d9414774 NP |
1627 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1628 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1629 | kunmap(page); |
d9414774 NP |
1630 | |
1631 | FreeXid(xid); | |
fb8c4b14 | 1632 | } else { |
d9414774 NP |
1633 | rc = copied; |
1634 | pos += copied; | |
1da177e4 LT |
1635 | set_page_dirty(page); |
1636 | } | |
1637 | ||
d9414774 NP |
1638 | if (rc > 0) { |
1639 | spin_lock(&inode->i_lock); | |
1640 | if (pos > inode->i_size) | |
1641 | i_size_write(inode, pos); | |
1642 | spin_unlock(&inode->i_lock); | |
1643 | } | |
1644 | ||
1645 | unlock_page(page); | |
1646 | page_cache_release(page); | |
1647 | ||
1da177e4 LT |
1648 | return rc; |
1649 | } | |
1650 | ||
1651 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1652 | { | |
1653 | int xid; | |
1654 | int rc = 0; | |
b298f223 SF |
1655 | struct cifsTconInfo *tcon; |
1656 | struct cifsFileInfo *smbfile = | |
1657 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1658 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1659 | |
1660 | xid = GetXid(); | |
1661 | ||
fb8c4b14 | 1662 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1663 | 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 | ||
1687 | cFYI(1, ("sync page %p",page)); | |
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 | ||
26a21b98 | 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 | |
fb8c4b14 | 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 LT |
1760 | } |
1761 | open_file = (struct cifsFileInfo *)file->private_data; | |
1762 | ||
ad7a2926 | 1763 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 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 LT |
1841 | } |
1842 | open_file = (struct cifsFileInfo *)file->private_data; | |
1843 | ||
1844 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1845 | cFYI(1, ("attempting read on write only file instance")); | |
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 | { | |
e6a00296 | 1891 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1892 | int rc, xid; |
1893 | ||
1894 | xid = GetXid(); | |
1895 | rc = cifs_revalidate(dentry); | |
1896 | if (rc) { | |
1897 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1898 | FreeXid(xid); | |
1899 | return rc; | |
1900 | } | |
1901 | rc = generic_file_mmap(file, vma); | |
1902 | FreeXid(xid); | |
1903 | return rc; | |
1904 | } | |
1905 | ||
1906 | ||
fb8c4b14 | 1907 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1908 | struct list_head *pages, int bytes_read, char *data, |
1909 | struct pagevec *plru_pvec) | |
1910 | { | |
1911 | struct page *page; | |
1912 | char *target; | |
1913 | ||
1914 | while (bytes_read > 0) { | |
1915 | if (list_empty(pages)) | |
1916 | break; | |
1917 | ||
1918 | page = list_entry(pages->prev, struct page, lru); | |
1919 | list_del(&page->lru); | |
1920 | ||
1921 | if (add_to_page_cache(page, mapping, page->index, | |
1922 | GFP_KERNEL)) { | |
1923 | page_cache_release(page); | |
1924 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1925 | data += PAGE_CACHE_SIZE; |
1926 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1927 | continue; |
1928 | } | |
1929 | ||
fb8c4b14 | 1930 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1931 | |
1932 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1933 | memcpy(target, data, bytes_read); | |
1934 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1935 | memset(target + bytes_read, 0, |
1da177e4 LT |
1936 | PAGE_CACHE_SIZE - bytes_read); |
1937 | bytes_read = 0; | |
1938 | } else { | |
1939 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1940 | bytes_read -= PAGE_CACHE_SIZE; | |
1941 | } | |
1942 | kunmap_atomic(target, KM_USER0); | |
1943 | ||
1944 | flush_dcache_page(page); | |
1945 | SetPageUptodate(page); | |
1946 | unlock_page(page); | |
1947 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 1948 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
1949 | data += PAGE_CACHE_SIZE; |
1950 | } | |
1951 | return; | |
1952 | } | |
1953 | ||
1954 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1955 | struct list_head *page_list, unsigned num_pages) | |
1956 | { | |
1957 | int rc = -EACCES; | |
1958 | int xid; | |
1959 | loff_t offset; | |
1960 | struct page *page; | |
1961 | struct cifs_sb_info *cifs_sb; | |
1962 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1963 | unsigned int bytes_read = 0; |
fb8c4b14 | 1964 | unsigned int read_size, i; |
1da177e4 LT |
1965 | char *smb_read_data = NULL; |
1966 | struct smb_com_read_rsp *pSMBr; | |
1967 | struct pagevec lru_pvec; | |
1968 | struct cifsFileInfo *open_file; | |
ec637e3f | 1969 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1970 | |
1971 | xid = GetXid(); | |
1972 | if (file->private_data == NULL) { | |
0f3bc09e | 1973 | rc = -EBADF; |
1da177e4 | 1974 | FreeXid(xid); |
0f3bc09e | 1975 | return rc; |
1da177e4 LT |
1976 | } |
1977 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1978 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1979 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1980 | |
1da177e4 | 1981 | pagevec_init(&lru_pvec, 0); |
61de800d | 1982 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
1983 | for (i = 0; i < num_pages; ) { |
1984 | unsigned contig_pages; | |
1985 | struct page *tmp_page; | |
1986 | unsigned long expected_index; | |
1987 | ||
1988 | if (list_empty(page_list)) | |
1989 | break; | |
1990 | ||
1991 | page = list_entry(page_list->prev, struct page, lru); | |
1992 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1993 | ||
1994 | /* count adjacent pages that we will read into */ | |
1995 | contig_pages = 0; | |
fb8c4b14 | 1996 | expected_index = |
1da177e4 | 1997 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1998 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1999 | if (tmp_page->index == expected_index) { |
2000 | contig_pages++; | |
2001 | expected_index++; | |
2002 | } else | |
fb8c4b14 | 2003 | break; |
1da177e4 LT |
2004 | } |
2005 | if (contig_pages + i > num_pages) | |
2006 | contig_pages = num_pages - i; | |
2007 | ||
2008 | /* for reads over a certain size could initiate async | |
2009 | read ahead */ | |
2010 | ||
2011 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2012 | /* Read size needs to be in multiples of one page */ | |
2013 | read_size = min_t(const unsigned int, read_size, | |
2014 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2015 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2016 | read_size, contig_pages)); |
1da177e4 LT |
2017 | rc = -EAGAIN; |
2018 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2019 | if ((open_file->invalidHandle) && |
1da177e4 | 2020 | (!open_file->closePend)) { |
4b18f2a9 | 2021 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2022 | if (rc != 0) |
2023 | break; | |
2024 | } | |
2025 | ||
bfa0d75a | 2026 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2027 | open_file->netfid, |
2028 | read_size, offset, | |
2029 | &bytes_read, &smb_read_data, | |
2030 | &buf_type); | |
a9d02ad4 | 2031 | /* BB more RC checks ? */ |
fb8c4b14 | 2032 | if (rc == -EAGAIN) { |
1da177e4 | 2033 | if (smb_read_data) { |
fb8c4b14 | 2034 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2035 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2036 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2037 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2038 | smb_read_data = NULL; |
2039 | } | |
2040 | } | |
2041 | } | |
2042 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2043 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2044 | break; |
2045 | } else if (bytes_read > 0) { | |
6f88cc2e | 2046 | task_io_account_read(bytes_read); |
1da177e4 LT |
2047 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2048 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2049 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2050 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2051 | ||
2052 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2053 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2054 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2055 | i++; /* account for partial page */ |
2056 | ||
fb8c4b14 | 2057 | /* server copy of file can have smaller size |
1da177e4 | 2058 | than client */ |
fb8c4b14 SF |
2059 | /* BB do we need to verify this common case ? |
2060 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2061 | we will hit it on next read */ |
2062 | ||
05ac9d4b | 2063 | /* break; */ |
1da177e4 LT |
2064 | } |
2065 | } else { | |
2066 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2067 | "Cleaning remaining pages from readahead list", | |
2068 | bytes_read, offset)); | |
fb8c4b14 | 2069 | /* BB turn off caching and do new lookup on |
1da177e4 | 2070 | file size at server? */ |
1da177e4 LT |
2071 | break; |
2072 | } | |
2073 | if (smb_read_data) { | |
fb8c4b14 | 2074 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2075 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2076 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2077 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2078 | smb_read_data = NULL; |
2079 | } | |
2080 | bytes_read = 0; | |
2081 | } | |
2082 | ||
4f98a2fe | 2083 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2084 | |
2085 | /* need to free smb_read_data buf before exit */ | |
2086 | if (smb_read_data) { | |
fb8c4b14 | 2087 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2088 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2089 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2090 | cifs_buf_release(smb_read_data); |
1da177e4 | 2091 | smb_read_data = NULL; |
fb8c4b14 | 2092 | } |
1da177e4 LT |
2093 | |
2094 | FreeXid(xid); | |
2095 | return rc; | |
2096 | } | |
2097 | ||
2098 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2099 | loff_t *poffset) | |
2100 | { | |
2101 | char *read_data; | |
2102 | int rc; | |
2103 | ||
2104 | page_cache_get(page); | |
2105 | read_data = kmap(page); | |
2106 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2107 | |
1da177e4 | 2108 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2109 | |
1da177e4 LT |
2110 | if (rc < 0) |
2111 | goto io_error; | |
2112 | else | |
fb8c4b14 SF |
2113 | cFYI(1, ("Bytes read %d", rc)); |
2114 | ||
e6a00296 JJS |
2115 | file->f_path.dentry->d_inode->i_atime = |
2116 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2117 | |
1da177e4 LT |
2118 | if (PAGE_CACHE_SIZE > rc) |
2119 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2120 | ||
2121 | flush_dcache_page(page); | |
2122 | SetPageUptodate(page); | |
2123 | rc = 0; | |
fb8c4b14 | 2124 | |
1da177e4 | 2125 | io_error: |
fb8c4b14 | 2126 | kunmap(page); |
1da177e4 LT |
2127 | page_cache_release(page); |
2128 | return rc; | |
2129 | } | |
2130 | ||
2131 | static int cifs_readpage(struct file *file, struct page *page) | |
2132 | { | |
2133 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2134 | int rc = -EACCES; | |
2135 | int xid; | |
2136 | ||
2137 | xid = GetXid(); | |
2138 | ||
2139 | if (file->private_data == NULL) { | |
0f3bc09e | 2140 | rc = -EBADF; |
1da177e4 | 2141 | FreeXid(xid); |
0f3bc09e | 2142 | return rc; |
1da177e4 LT |
2143 | } |
2144 | ||
fb8c4b14 | 2145 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2146 | page, (int)offset, (int)offset)); |
2147 | ||
2148 | rc = cifs_readpage_worker(file, page, &offset); | |
2149 | ||
2150 | unlock_page(page); | |
2151 | ||
2152 | FreeXid(xid); | |
2153 | return rc; | |
2154 | } | |
2155 | ||
a403a0a3 SF |
2156 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2157 | { | |
2158 | struct cifsFileInfo *open_file; | |
2159 | ||
2160 | read_lock(&GlobalSMBSeslock); | |
2161 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2162 | if (open_file->closePend) | |
2163 | continue; | |
2164 | if (open_file->pfile && | |
2165 | ((open_file->pfile->f_flags & O_RDWR) || | |
2166 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2167 | read_unlock(&GlobalSMBSeslock); | |
2168 | return 1; | |
2169 | } | |
2170 | } | |
2171 | read_unlock(&GlobalSMBSeslock); | |
2172 | return 0; | |
2173 | } | |
2174 | ||
1da177e4 LT |
2175 | /* We do not want to update the file size from server for inodes |
2176 | open for write - to avoid races with writepage extending | |
2177 | the file - in the future we could consider allowing | |
fb8c4b14 | 2178 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2179 | but this is tricky to do without racing with writebehind |
2180 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2181 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2182 | { |
a403a0a3 | 2183 | if (!cifsInode) |
4b18f2a9 | 2184 | return true; |
50c2f753 | 2185 | |
a403a0a3 SF |
2186 | if (is_inode_writable(cifsInode)) { |
2187 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2188 | struct cifs_sb_info *cifs_sb; |
2189 | ||
c32a0b68 | 2190 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2191 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2192 | /* since no page cache to corrupt on directio |
c32a0b68 | 2193 | we can change size safely */ |
4b18f2a9 | 2194 | return true; |
c32a0b68 SF |
2195 | } |
2196 | ||
fb8c4b14 | 2197 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2198 | return true; |
7ba52631 | 2199 | |
4b18f2a9 | 2200 | return false; |
23e7dd7d | 2201 | } else |
4b18f2a9 | 2202 | return true; |
1da177e4 LT |
2203 | } |
2204 | ||
d9414774 NP |
2205 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2206 | loff_t pos, unsigned len, unsigned flags, | |
2207 | struct page **pagep, void **fsdata) | |
1da177e4 | 2208 | { |
d9414774 NP |
2209 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2210 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2211 | loff_t page_start = pos & PAGE_MASK; |
2212 | loff_t i_size; | |
2213 | struct page *page; | |
2214 | int rc = 0; | |
d9414774 NP |
2215 | |
2216 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2217 | ||
54566b2c | 2218 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2219 | if (!page) { |
2220 | rc = -ENOMEM; | |
2221 | goto out; | |
2222 | } | |
8a236264 | 2223 | |
a98ee8c1 JL |
2224 | if (PageUptodate(page)) |
2225 | goto out; | |
8a236264 | 2226 | |
a98ee8c1 JL |
2227 | /* |
2228 | * If we write a full page it will be up to date, no need to read from | |
2229 | * the server. If the write is short, we'll end up doing a sync write | |
2230 | * instead. | |
2231 | */ | |
2232 | if (len == PAGE_CACHE_SIZE) | |
2233 | goto out; | |
8a236264 | 2234 | |
a98ee8c1 JL |
2235 | /* |
2236 | * optimize away the read when we have an oplock, and we're not | |
2237 | * expecting to use any of the data we'd be reading in. That | |
2238 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2239 | * and the write will cover all of the existing data. | |
2240 | */ | |
2241 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2242 | i_size = i_size_read(mapping->host); | |
2243 | if (page_start >= i_size || | |
2244 | (offset == 0 && (pos + len) >= i_size)) { | |
2245 | zero_user_segments(page, 0, offset, | |
2246 | offset + len, | |
2247 | PAGE_CACHE_SIZE); | |
2248 | /* | |
2249 | * PageChecked means that the parts of the page | |
2250 | * to which we're not writing are considered up | |
2251 | * to date. Once the data is copied to the | |
2252 | * page, it can be set uptodate. | |
2253 | */ | |
2254 | SetPageChecked(page); | |
2255 | goto out; | |
2256 | } | |
2257 | } | |
d9414774 | 2258 | |
a98ee8c1 JL |
2259 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2260 | /* | |
2261 | * might as well read a page, it is fast enough. If we get | |
2262 | * an error, we don't need to return it. cifs_write_end will | |
2263 | * do a sync write instead since PG_uptodate isn't set. | |
2264 | */ | |
2265 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2266 | } else { |
2267 | /* we could try using another file handle if there is one - | |
2268 | but how would we lock it to prevent close of that handle | |
2269 | racing with this read? In any case | |
d9414774 | 2270 | this will be written out by write_end so is fine */ |
1da177e4 | 2271 | } |
a98ee8c1 JL |
2272 | out: |
2273 | *pagep = page; | |
2274 | return rc; | |
1da177e4 LT |
2275 | } |
2276 | ||
3bc303c2 JL |
2277 | static void |
2278 | cifs_oplock_break(struct slow_work *work) | |
2279 | { | |
2280 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2281 | oplock_break); | |
2282 | struct inode *inode = cfile->pInode; | |
2283 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2284 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2285 | int rc, waitrc = 0; | |
2286 | ||
2287 | if (inode && S_ISREG(inode->i_mode)) { | |
2288 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
2289 | if (cinode->clientCanCacheAll == 0) | |
2290 | break_lease(inode, FMODE_READ); | |
2291 | else if (cinode->clientCanCacheRead == 0) | |
2292 | break_lease(inode, FMODE_WRITE); | |
2293 | #endif | |
2294 | rc = filemap_fdatawrite(inode->i_mapping); | |
2295 | if (cinode->clientCanCacheRead == 0) { | |
2296 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2297 | invalidate_remote_inode(inode); | |
2298 | } | |
2299 | if (!rc) | |
2300 | rc = waitrc; | |
2301 | if (rc) | |
2302 | cinode->write_behind_rc = rc; | |
2303 | cFYI(1, ("Oplock flush inode %p rc %d", inode, rc)); | |
2304 | } | |
2305 | ||
2306 | /* | |
2307 | * releasing stale oplock after recent reconnect of smb session using | |
2308 | * a now incorrect file handle is not a data integrity issue but do | |
2309 | * not bother sending an oplock release if session to server still is | |
2310 | * disconnected since oplock already released by the server | |
2311 | */ | |
2312 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2313 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2314 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
2315 | cFYI(1, ("Oplock release rc = %d", rc)); | |
2316 | } | |
2317 | } | |
2318 | ||
2319 | static int | |
2320 | cifs_oplock_break_get(struct slow_work *work) | |
2321 | { | |
2322 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2323 | oplock_break); | |
2324 | mntget(cfile->mnt); | |
2325 | cifsFileInfo_get(cfile); | |
2326 | return 0; | |
2327 | } | |
2328 | ||
2329 | static void | |
2330 | cifs_oplock_break_put(struct slow_work *work) | |
2331 | { | |
2332 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2333 | oplock_break); | |
2334 | mntput(cfile->mnt); | |
2335 | cifsFileInfo_put(cfile); | |
2336 | } | |
2337 | ||
2338 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2339 | .get_ref = cifs_oplock_break_get, | |
2340 | .put_ref = cifs_oplock_break_put, | |
2341 | .execute = cifs_oplock_break, | |
2342 | }; | |
2343 | ||
f5e54d6e | 2344 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2345 | .readpage = cifs_readpage, |
2346 | .readpages = cifs_readpages, | |
2347 | .writepage = cifs_writepage, | |
37c0eb46 | 2348 | .writepages = cifs_writepages, |
d9414774 NP |
2349 | .write_begin = cifs_write_begin, |
2350 | .write_end = cifs_write_end, | |
1da177e4 LT |
2351 | .set_page_dirty = __set_page_dirty_nobuffers, |
2352 | /* .sync_page = cifs_sync_page, */ | |
2353 | /* .direct_IO = */ | |
2354 | }; | |
273d81d6 DK |
2355 | |
2356 | /* | |
2357 | * cifs_readpages requires the server to support a buffer large enough to | |
2358 | * contain the header plus one complete page of data. Otherwise, we need | |
2359 | * to leave cifs_readpages out of the address space operations. | |
2360 | */ | |
f5e54d6e | 2361 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2362 | .readpage = cifs_readpage, |
2363 | .writepage = cifs_writepage, | |
2364 | .writepages = cifs_writepages, | |
d9414774 NP |
2365 | .write_begin = cifs_write_begin, |
2366 | .write_end = cifs_write_end, | |
273d81d6 DK |
2367 | .set_page_dirty = __set_page_dirty_nobuffers, |
2368 | /* .sync_page = cifs_sync_page, */ | |
2369 | /* .direct_IO = */ | |
2370 | }; |