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; | |
6b2f3d1f CH |
79 | if (flags & O_DSYNC) |
80 | posix_flags |= (fmode_t)O_DSYNC; | |
81 | if (flags & __O_SYNC) | |
82 | posix_flags |= (fmode_t)__O_SYNC; | |
7fc8f4e9 SF |
83 | if (flags & O_DIRECTORY) |
84 | posix_flags |= (fmode_t)O_DIRECTORY; | |
85 | if (flags & O_NOFOLLOW) | |
86 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
87 | if (flags & O_DIRECT) | |
88 | posix_flags |= (fmode_t)O_DIRECT; | |
89 | ||
90 | return posix_flags; | |
1da177e4 LT |
91 | } |
92 | ||
93 | static inline int cifs_get_disposition(unsigned int flags) | |
94 | { | |
95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
96 | return FILE_CREATE; | |
97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
98 | return FILE_OVERWRITE_IF; | |
99 | else if ((flags & O_CREAT) == O_CREAT) | |
100 | return FILE_OPEN_IF; | |
55aa2e09 SF |
101 | else if ((flags & O_TRUNC) == O_TRUNC) |
102 | return FILE_OVERWRITE; | |
1da177e4 LT |
103 | else |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
276a74a4 | 107 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
108 | static inline int |
109 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
110 | struct cifsInodeInfo *pCifsInode, | |
111 | struct cifsFileInfo *pCifsFile, __u32 oplock, | |
112 | u16 netfid) | |
276a74a4 | 113 | { |
276a74a4 | 114 | |
276a74a4 | 115 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
116 | |
117 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
118 | if (pCifsInode == NULL) { | |
119 | write_unlock(&GlobalSMBSeslock); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
276a74a4 SF |
123 | if (pCifsInode->clientCanCacheRead) { |
124 | /* we have the inode open somewhere else | |
125 | no need to discard cache data */ | |
126 | goto psx_client_can_cache; | |
127 | } | |
128 | ||
129 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
130 | BB fIX following section BB FIXME */ | |
131 | ||
132 | /* if not oplocked, invalidate inode pages if mtime or file | |
133 | size changed */ | |
134 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
135 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
136 | (file->f_path.dentry->d_inode->i_size == | |
137 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
138 | cFYI(1, ("inode unchanged on server")); | |
139 | } else { | |
140 | if (file->f_path.dentry->d_inode->i_mapping) { | |
141 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
142 | if (rc != 0) | |
143 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
144 | } | |
145 | cFYI(1, ("invalidating remote inode since open detected it " | |
146 | "changed")); | |
147 | invalidate_remote_inode(file->f_path.dentry->d_inode); | |
148 | } */ | |
149 | ||
150 | psx_client_can_cache: | |
151 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
152 | pCifsInode->clientCanCacheAll = true; | |
153 | pCifsInode->clientCanCacheRead = true; | |
154 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
155 | file->f_path.dentry->d_inode)); | |
156 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
157 | pCifsInode->clientCanCacheRead = true; | |
158 | ||
159 | /* will have to change the unlock if we reenable the | |
160 | filemap_fdatawrite (which does not seem necessary */ | |
161 | write_unlock(&GlobalSMBSeslock); | |
162 | return 0; | |
163 | } | |
164 | ||
703a3b8e SF |
165 | static struct cifsFileInfo * |
166 | cifs_fill_filedata(struct file *file) | |
167 | { | |
168 | struct list_head *tmp; | |
169 | struct cifsFileInfo *pCifsFile = NULL; | |
170 | struct cifsInodeInfo *pCifsInode = NULL; | |
171 | ||
172 | /* search inode for this file and fill in file->private_data */ | |
173 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
174 | read_lock(&GlobalSMBSeslock); | |
175 | list_for_each(tmp, &pCifsInode->openFileList) { | |
176 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
177 | if ((pCifsFile->pfile == NULL) && | |
178 | (pCifsFile->pid == current->tgid)) { | |
179 | /* mode set in cifs_create */ | |
180 | ||
181 | /* needed for writepage */ | |
182 | pCifsFile->pfile = file; | |
183 | file->private_data = pCifsFile; | |
184 | break; | |
185 | } | |
186 | } | |
187 | read_unlock(&GlobalSMBSeslock); | |
188 | ||
189 | if (file->private_data != NULL) { | |
190 | return pCifsFile; | |
191 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
192 | cERROR(1, ("could not find file instance for " | |
193 | "new file %p", file)); | |
194 | return NULL; | |
195 | } | |
196 | ||
1da177e4 LT |
197 | /* all arguments to this function must be checked for validity in caller */ |
198 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
199 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
200 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
201 | char *full_path, int xid) | |
202 | { | |
203 | struct timespec temp; | |
204 | int rc; | |
205 | ||
1da177e4 LT |
206 | if (pCifsInode->clientCanCacheRead) { |
207 | /* we have the inode open somewhere else | |
208 | no need to discard cache data */ | |
209 | goto client_can_cache; | |
210 | } | |
211 | ||
212 | /* BB need same check in cifs_create too? */ | |
213 | /* if not oplocked, invalidate inode pages if mtime or file | |
214 | size changed */ | |
07119a4d | 215 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
216 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
217 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
218 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
219 | cFYI(1, ("inode unchanged on server")); | |
220 | } else { | |
e6a00296 | 221 | if (file->f_path.dentry->d_inode->i_mapping) { |
ff215713 SF |
222 | /* BB no need to lock inode until after invalidate |
223 | since namei code should already have it locked? */ | |
cea21805 JL |
224 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
225 | if (rc != 0) | |
226 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
227 | } |
228 | cFYI(1, ("invalidating remote inode since open detected it " | |
229 | "changed")); | |
e6a00296 | 230 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
231 | } |
232 | ||
233 | client_can_cache: | |
c18c842b | 234 | if (pTcon->unix_ext) |
e6a00296 | 235 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
236 | full_path, inode->i_sb, xid); |
237 | else | |
e6a00296 | 238 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 239 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
240 | |
241 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
242 | pCifsInode->clientCanCacheAll = true; |
243 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 244 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 245 | file->f_path.dentry->d_inode)); |
1da177e4 | 246 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 247 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
248 | |
249 | return rc; | |
250 | } | |
251 | ||
252 | int cifs_open(struct inode *inode, struct file *file) | |
253 | { | |
254 | int rc = -EACCES; | |
590a3fe0 JL |
255 | int xid; |
256 | __u32 oplock; | |
1da177e4 | 257 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 258 | struct cifsTconInfo *tcon; |
1da177e4 LT |
259 | struct cifsFileInfo *pCifsFile; |
260 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
261 | char *full_path = NULL; |
262 | int desiredAccess; | |
263 | int disposition; | |
264 | __u16 netfid; | |
265 | FILE_ALL_INFO *buf = NULL; | |
266 | ||
267 | xid = GetXid(); | |
268 | ||
269 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 270 | tcon = cifs_sb->tcon; |
1da177e4 | 271 | |
a6ce4932 | 272 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
273 | pCifsFile = cifs_fill_filedata(file); |
274 | if (pCifsFile) { | |
0f3bc09e | 275 | rc = 0; |
a6ce4932 | 276 | FreeXid(xid); |
0f3bc09e | 277 | return rc; |
703a3b8e | 278 | } |
1da177e4 | 279 | |
e6a00296 | 280 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 281 | if (full_path == NULL) { |
0f3bc09e | 282 | rc = -ENOMEM; |
1da177e4 | 283 | FreeXid(xid); |
0f3bc09e | 284 | return rc; |
1da177e4 LT |
285 | } |
286 | ||
7521a3c5 | 287 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 288 | inode, file->f_flags, full_path)); |
276a74a4 SF |
289 | |
290 | if (oplockEnabled) | |
291 | oplock = REQ_OPLOCK; | |
292 | else | |
293 | oplock = 0; | |
294 | ||
64cc2c63 SF |
295 | if (!tcon->broken_posix_open && tcon->unix_ext && |
296 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
297 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
298 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
299 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
300 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 301 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
276a74a4 SF |
302 | cifs_sb->mnt_file_mode /* ignored */, |
303 | oflags, &oplock, &netfid, xid); | |
304 | if (rc == 0) { | |
305 | cFYI(1, ("posix open succeeded")); | |
306 | /* no need for special case handling of setting mode | |
307 | on read only files needed here */ | |
308 | ||
703a3b8e | 309 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
310 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
311 | pCifsFile, oplock, netfid); | |
312 | goto out; | |
64cc2c63 SF |
313 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
314 | if (tcon->ses->serverNOS) | |
315 | cERROR(1, ("server %s of type %s returned" | |
316 | " unexpected error on SMB posix open" | |
317 | ", disabling posix open support." | |
318 | " Check if server update available.", | |
319 | tcon->ses->serverName, | |
320 | tcon->ses->serverNOS)); | |
321 | tcon->broken_posix_open = true; | |
276a74a4 SF |
322 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
323 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
324 | goto out; | |
64cc2c63 SF |
325 | /* else fallthrough to retry open the old way on network i/o |
326 | or DFS errors */ | |
276a74a4 SF |
327 | } |
328 | ||
1da177e4 LT |
329 | desiredAccess = cifs_convert_flags(file->f_flags); |
330 | ||
331 | /********************************************************************* | |
332 | * open flag mapping table: | |
fb8c4b14 | 333 | * |
1da177e4 | 334 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 335 | * ---------- ---------------- |
1da177e4 LT |
336 | * O_CREAT FILE_OPEN_IF |
337 | * O_CREAT | O_EXCL FILE_CREATE | |
338 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
339 | * O_TRUNC FILE_OVERWRITE | |
340 | * none of the above FILE_OPEN | |
341 | * | |
342 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 343 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
344 | * O_CREAT | O_TRUNC is similar but truncates the existing |
345 | * file rather than creating a new file as FILE_SUPERSEDE does | |
346 | * (which uses the attributes / metadata passed in on open call) | |
347 | *? | |
fb8c4b14 | 348 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
349 | *? and the read write flags match reasonably. O_LARGEFILE |
350 | *? is irrelevant because largefile support is always used | |
351 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
352 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
353 | *********************************************************************/ | |
354 | ||
355 | disposition = cifs_get_disposition(file->f_flags); | |
356 | ||
1da177e4 LT |
357 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
358 | ||
359 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
360 | and calling get_inode_info with returned buf (at least helps | |
361 | non-Unix server case) */ | |
362 | ||
fb8c4b14 SF |
363 | /* BB we can not do this if this is the second open of a file |
364 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
365 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
366 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
367 | if (!buf) { | |
368 | rc = -ENOMEM; | |
369 | goto out; | |
370 | } | |
5bafd765 SF |
371 | |
372 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 373 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 374 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
375 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
376 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
377 | else |
378 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
379 | ||
a9d02ad4 SF |
380 | if (rc == -EIO) { |
381 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 382 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
383 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
384 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
385 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
386 | } | |
1da177e4 | 387 | if (rc) { |
26a21b98 | 388 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
389 | goto out; |
390 | } | |
3321b791 | 391 | |
086f68bd JL |
392 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
393 | file->f_flags); | |
394 | file->private_data = pCifsFile; | |
1da177e4 LT |
395 | if (file->private_data == NULL) { |
396 | rc = -ENOMEM; | |
397 | goto out; | |
398 | } | |
1da177e4 | 399 | |
3321b791 JL |
400 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
401 | &oplock, buf, full_path, xid); | |
1da177e4 | 402 | |
fb8c4b14 | 403 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
404 | /* time to set mode which we can not set earlier due to |
405 | problems creating new read-only files */ | |
276a74a4 | 406 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
407 | struct cifs_unix_set_info_args args = { |
408 | .mode = inode->i_mode, | |
409 | .uid = NO_CHANGE_64, | |
410 | .gid = NO_CHANGE_64, | |
411 | .ctime = NO_CHANGE_64, | |
412 | .atime = NO_CHANGE_64, | |
413 | .mtime = NO_CHANGE_64, | |
414 | .device = 0, | |
415 | }; | |
01ea95e3 JL |
416 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
417 | cifs_sb->local_nls, | |
418 | cifs_sb->mnt_cifs_flags & | |
737b758c | 419 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
423 | out: | |
424 | kfree(buf); | |
425 | kfree(full_path); | |
426 | FreeXid(xid); | |
427 | return rc; | |
428 | } | |
429 | ||
0418726b | 430 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
431 | /* to server was lost */ |
432 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
433 | { | |
434 | int rc = 0; | |
435 | ||
436 | /* BB list all locks open on this file and relock */ | |
437 | ||
438 | return rc; | |
439 | } | |
440 | ||
4b18f2a9 | 441 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
442 | { |
443 | int rc = -EACCES; | |
590a3fe0 JL |
444 | int xid; |
445 | __u32 oplock; | |
1da177e4 | 446 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 447 | struct cifsTconInfo *tcon; |
1da177e4 LT |
448 | struct cifsFileInfo *pCifsFile; |
449 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 450 | struct inode *inode; |
1da177e4 LT |
451 | char *full_path = NULL; |
452 | int desiredAccess; | |
453 | int disposition = FILE_OPEN; | |
454 | __u16 netfid; | |
455 | ||
ad7a2926 | 456 | if (file->private_data) |
1da177e4 | 457 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 458 | else |
1da177e4 LT |
459 | return -EBADF; |
460 | ||
461 | xid = GetXid(); | |
f0a71eb8 | 462 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 463 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 464 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 465 | rc = 0; |
1da177e4 | 466 | FreeXid(xid); |
0f3bc09e | 467 | return rc; |
1da177e4 LT |
468 | } |
469 | ||
e6a00296 | 470 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
471 | cERROR(1, ("no valid name if dentry freed")); |
472 | dump_stack(); | |
473 | rc = -EBADF; | |
474 | goto reopen_error_exit; | |
475 | } | |
476 | ||
477 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 478 | if (inode == NULL) { |
3a9f462f SF |
479 | cERROR(1, ("inode not valid")); |
480 | dump_stack(); | |
481 | rc = -EBADF; | |
482 | goto reopen_error_exit; | |
1da177e4 | 483 | } |
50c2f753 | 484 | |
1da177e4 | 485 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 486 | tcon = cifs_sb->tcon; |
3a9f462f | 487 | |
1da177e4 LT |
488 | /* can not grab rename sem here because various ops, including |
489 | those that already have the rename sem can end up causing writepage | |
490 | to get called and if the server was down that means we end up here, | |
491 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 492 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 493 | if (full_path == NULL) { |
3a9f462f SF |
494 | rc = -ENOMEM; |
495 | reopen_error_exit: | |
f0a71eb8 | 496 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 497 | FreeXid(xid); |
3a9f462f | 498 | return rc; |
1da177e4 LT |
499 | } |
500 | ||
3a9f462f | 501 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 502 | inode, file->f_flags, full_path)); |
1da177e4 LT |
503 | |
504 | if (oplockEnabled) | |
505 | oplock = REQ_OPLOCK; | |
506 | else | |
4b18f2a9 | 507 | oplock = 0; |
1da177e4 | 508 | |
7fc8f4e9 SF |
509 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
510 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
511 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
512 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
513 | /* can not refresh inode info since size could be stale */ | |
3bc303c2 | 514 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
7fc8f4e9 SF |
515 | cifs_sb->mnt_file_mode /* ignored */, |
516 | oflags, &oplock, &netfid, xid); | |
517 | if (rc == 0) { | |
518 | cFYI(1, ("posix reopen succeeded")); | |
519 | goto reopen_success; | |
520 | } | |
521 | /* fallthrough to retry open the old way on errors, especially | |
522 | in the reconnect path it is important to retry hard */ | |
523 | } | |
524 | ||
525 | desiredAccess = cifs_convert_flags(file->f_flags); | |
526 | ||
1da177e4 | 527 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
528 | by SMBOpen and then calling get_inode_info with returned buf |
529 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
530 | and server version of file size can be stale. If we knew for sure |
531 | that inode was not dirty locally we could do this */ | |
532 | ||
7fc8f4e9 | 533 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 534 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 535 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 536 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 537 | if (rc) { |
f0a71eb8 | 538 | mutex_unlock(&pCifsFile->fh_mutex); |
26a21b98 SF |
539 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
540 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 541 | } else { |
7fc8f4e9 | 542 | reopen_success: |
1da177e4 | 543 | pCifsFile->netfid = netfid; |
4b18f2a9 | 544 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 545 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
546 | pCifsInode = CIFS_I(inode); |
547 | if (pCifsInode) { | |
548 | if (can_flush) { | |
cea21805 JL |
549 | rc = filemap_write_and_wait(inode->i_mapping); |
550 | if (rc != 0) | |
551 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
552 | /* temporarily disable caching while we |
553 | go to server to get inode info */ | |
4b18f2a9 SF |
554 | pCifsInode->clientCanCacheAll = false; |
555 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 556 | if (tcon->unix_ext) |
1da177e4 LT |
557 | rc = cifs_get_inode_info_unix(&inode, |
558 | full_path, inode->i_sb, xid); | |
559 | else | |
560 | rc = cifs_get_inode_info(&inode, | |
561 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 562 | xid, NULL); |
1da177e4 LT |
563 | } /* else we are writing out data to server already |
564 | and could deadlock if we tried to flush data, and | |
565 | since we do not know if we have data that would | |
566 | invalidate the current end of file on the server | |
567 | we can not go to the server to get the new inod | |
568 | info */ | |
569 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
570 | pCifsInode->clientCanCacheAll = true; |
571 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 572 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 573 | file->f_path.dentry->d_inode)); |
1da177e4 | 574 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
575 | pCifsInode->clientCanCacheRead = true; |
576 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 577 | } else { |
4b18f2a9 SF |
578 | pCifsInode->clientCanCacheRead = false; |
579 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
580 | } |
581 | cifs_relock_file(pCifsFile); | |
582 | } | |
583 | } | |
1da177e4 LT |
584 | kfree(full_path); |
585 | FreeXid(xid); | |
586 | return rc; | |
587 | } | |
588 | ||
589 | int cifs_close(struct inode *inode, struct file *file) | |
590 | { | |
591 | int rc = 0; | |
15745320 | 592 | int xid, timeout; |
1da177e4 LT |
593 | struct cifs_sb_info *cifs_sb; |
594 | struct cifsTconInfo *pTcon; | |
595 | struct cifsFileInfo *pSMBFile = | |
596 | (struct cifsFileInfo *)file->private_data; | |
597 | ||
598 | xid = GetXid(); | |
599 | ||
600 | cifs_sb = CIFS_SB(inode->i_sb); | |
601 | pTcon = cifs_sb->tcon; | |
602 | if (pSMBFile) { | |
7ee1af76 | 603 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 604 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 605 | pSMBFile->closePend = true; |
1da177e4 LT |
606 | if (pTcon) { |
607 | /* no sense reconnecting to close a file that is | |
608 | already closed */ | |
3b795210 | 609 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 610 | write_unlock(&GlobalSMBSeslock); |
15745320 | 611 | timeout = 2; |
6ab409b5 | 612 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 613 | && (timeout <= 2048)) { |
23e7dd7d SF |
614 | /* Give write a better chance to get to |
615 | server ahead of the close. We do not | |
616 | want to add a wait_q here as it would | |
617 | increase the memory utilization as | |
618 | the struct would be in each open file, | |
fb8c4b14 | 619 | but this should give enough time to |
23e7dd7d | 620 | clear the socket */ |
90c81e0b SF |
621 | cFYI(DBG2, |
622 | ("close delay, write pending")); | |
23e7dd7d SF |
623 | msleep(timeout); |
624 | timeout *= 4; | |
4891d539 | 625 | } |
ddb4cbfc SF |
626 | if (!pTcon->need_reconnect && |
627 | !pSMBFile->invalidHandle) | |
628 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 629 | pSMBFile->netfid); |
ddb4cbfc SF |
630 | } else |
631 | write_unlock(&GlobalSMBSeslock); | |
632 | } else | |
633 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
634 | |
635 | /* Delete any outstanding lock records. | |
636 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 637 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
638 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
639 | list_del(&li->llist); | |
640 | kfree(li); | |
641 | } | |
796e5661 | 642 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 643 | |
cbe0476f | 644 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
645 | list_del(&pSMBFile->flist); |
646 | list_del(&pSMBFile->tlist); | |
cbe0476f | 647 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 648 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
649 | file->private_data = NULL; |
650 | } else | |
651 | rc = -EBADF; | |
652 | ||
4efa53f0 | 653 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
654 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
655 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
656 | /* if the file is not open we do not know if we can cache info | |
657 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
658 | CIFS_I(inode)->clientCanCacheRead = false; |
659 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 660 | } |
4efa53f0 | 661 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 662 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
663 | rc = CIFS_I(inode)->write_behind_rc; |
664 | FreeXid(xid); | |
665 | return rc; | |
666 | } | |
667 | ||
668 | int cifs_closedir(struct inode *inode, struct file *file) | |
669 | { | |
670 | int rc = 0; | |
671 | int xid; | |
672 | struct cifsFileInfo *pCFileStruct = | |
673 | (struct cifsFileInfo *)file->private_data; | |
674 | char *ptmp; | |
675 | ||
26a21b98 | 676 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
677 | |
678 | xid = GetXid(); | |
679 | ||
680 | if (pCFileStruct) { | |
681 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
682 | struct cifs_sb_info *cifs_sb = |
683 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
684 | |
685 | pTcon = cifs_sb->tcon; | |
686 | ||
687 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 688 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
689 | if (!pCFileStruct->srch_inf.endOfSearch && |
690 | !pCFileStruct->invalidHandle) { | |
691 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 692 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
693 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
694 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
695 | rc)); | |
696 | /* not much we can do if it fails anyway, ignore rc */ | |
697 | rc = 0; | |
ddb4cbfc SF |
698 | } else |
699 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
700 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
701 | if (ptmp) { | |
ec637e3f | 702 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 703 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 704 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
705 | cifs_small_buf_release(ptmp); |
706 | else | |
707 | cifs_buf_release(ptmp); | |
1da177e4 | 708 | } |
1da177e4 LT |
709 | kfree(file->private_data); |
710 | file->private_data = NULL; | |
711 | } | |
712 | /* BB can we lock the filestruct while this is going on? */ | |
713 | FreeXid(xid); | |
714 | return rc; | |
715 | } | |
716 | ||
7ee1af76 JA |
717 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
718 | __u64 offset, __u8 lockType) | |
719 | { | |
fb8c4b14 SF |
720 | struct cifsLockInfo *li = |
721 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
722 | if (li == NULL) |
723 | return -ENOMEM; | |
724 | li->offset = offset; | |
725 | li->length = len; | |
726 | li->type = lockType; | |
796e5661 | 727 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 728 | list_add(&li->llist, &fid->llist); |
796e5661 | 729 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
730 | return 0; |
731 | } | |
732 | ||
1da177e4 LT |
733 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
734 | { | |
735 | int rc, xid; | |
1da177e4 LT |
736 | __u32 numLock = 0; |
737 | __u32 numUnlock = 0; | |
738 | __u64 length; | |
4b18f2a9 | 739 | bool wait_flag = false; |
1da177e4 | 740 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 741 | struct cifsTconInfo *tcon; |
08547b03 SF |
742 | __u16 netfid; |
743 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 744 | bool posix_locking = 0; |
1da177e4 LT |
745 | |
746 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
747 | rc = -EACCES; | |
748 | xid = GetXid(); | |
749 | ||
750 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
751 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
752 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
753 | pfLock->fl_end)); | |
1da177e4 LT |
754 | |
755 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 756 | cFYI(1, ("Posix")); |
1da177e4 | 757 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 758 | cFYI(1, ("Flock")); |
1da177e4 | 759 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 760 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 761 | wait_flag = true; |
1da177e4 LT |
762 | } |
763 | if (pfLock->fl_flags & FL_ACCESS) | |
764 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 765 | "not implemented yet")); |
1da177e4 LT |
766 | if (pfLock->fl_flags & FL_LEASE) |
767 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 768 | if (pfLock->fl_flags & |
1da177e4 LT |
769 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
770 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
771 | ||
772 | if (pfLock->fl_type == F_WRLCK) { | |
773 | cFYI(1, ("F_WRLCK ")); | |
774 | numLock = 1; | |
775 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 776 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 777 | numUnlock = 1; |
d47d7c1a SF |
778 | /* Check if unlock includes more than |
779 | one lock range */ | |
1da177e4 | 780 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 781 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
782 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
783 | numLock = 1; | |
784 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 785 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
786 | numLock = 1; |
787 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 788 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
789 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
790 | numLock = 1; | |
791 | } else | |
d47d7c1a | 792 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 793 | |
e6a00296 | 794 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 795 | tcon = cifs_sb->tcon; |
1da177e4 LT |
796 | |
797 | if (file->private_data == NULL) { | |
0f3bc09e | 798 | rc = -EBADF; |
1da177e4 | 799 | FreeXid(xid); |
0f3bc09e | 800 | return rc; |
1da177e4 | 801 | } |
08547b03 SF |
802 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
803 | ||
13a6e42a SF |
804 | if ((tcon->ses->capabilities & CAP_UNIX) && |
805 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 806 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 807 | posix_locking = 1; |
08547b03 SF |
808 | /* BB add code here to normalize offset and length to |
809 | account for negative length which we can not accept over the | |
810 | wire */ | |
1da177e4 | 811 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 812 | if (posix_locking) { |
08547b03 | 813 | int posix_lock_type; |
fb8c4b14 | 814 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
815 | posix_lock_type = CIFS_RDLCK; |
816 | else | |
817 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 818 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 819 | length, pfLock, |
08547b03 SF |
820 | posix_lock_type, wait_flag); |
821 | FreeXid(xid); | |
822 | return rc; | |
823 | } | |
824 | ||
825 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 826 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 827 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 828 | if (rc == 0) { |
13a6e42a | 829 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
830 | pfLock->fl_start, 1 /* numUnlock */ , |
831 | 0 /* numLock */ , lockType, | |
832 | 0 /* wait flag */ ); | |
833 | pfLock->fl_type = F_UNLCK; | |
834 | if (rc != 0) | |
835 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 836 | "range %d during test of lock", rc)); |
1da177e4 LT |
837 | rc = 0; |
838 | ||
839 | } else { | |
840 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
841 | rc = 0; /* do not change lock type to unlock | |
842 | since range in use */ | |
843 | } | |
844 | ||
845 | FreeXid(xid); | |
846 | return rc; | |
847 | } | |
7ee1af76 JA |
848 | |
849 | if (!numLock && !numUnlock) { | |
850 | /* if no lock or unlock then nothing | |
851 | to do since we do not know what it is */ | |
852 | FreeXid(xid); | |
853 | return -EOPNOTSUPP; | |
854 | } | |
855 | ||
856 | if (posix_locking) { | |
08547b03 | 857 | int posix_lock_type; |
fb8c4b14 | 858 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
859 | posix_lock_type = CIFS_RDLCK; |
860 | else | |
861 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 862 | |
fb8c4b14 | 863 | if (numUnlock == 1) |
beb84dc8 | 864 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 865 | |
13a6e42a | 866 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 867 | length, pfLock, |
08547b03 | 868 | posix_lock_type, wait_flag); |
7ee1af76 | 869 | } else { |
fb8c4b14 SF |
870 | struct cifsFileInfo *fid = |
871 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
872 | |
873 | if (numLock) { | |
13a6e42a | 874 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 875 | pfLock->fl_start, |
7ee1af76 JA |
876 | 0, numLock, lockType, wait_flag); |
877 | ||
878 | if (rc == 0) { | |
879 | /* For Windows locks we must store them. */ | |
880 | rc = store_file_lock(fid, length, | |
881 | pfLock->fl_start, lockType); | |
882 | } | |
883 | } else if (numUnlock) { | |
884 | /* For each stored lock that this unlock overlaps | |
885 | completely, unlock it. */ | |
886 | int stored_rc = 0; | |
887 | struct cifsLockInfo *li, *tmp; | |
888 | ||
6b70c955 | 889 | rc = 0; |
796e5661 | 890 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
891 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
892 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 893 | (pfLock->fl_start + length) >= |
39db810c | 894 | (li->offset + li->length)) { |
13a6e42a | 895 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 896 | netfid, |
7ee1af76 | 897 | li->length, li->offset, |
4b18f2a9 | 898 | 1, 0, li->type, false); |
7ee1af76 JA |
899 | if (stored_rc) |
900 | rc = stored_rc; | |
901 | ||
902 | list_del(&li->llist); | |
903 | kfree(li); | |
904 | } | |
905 | } | |
796e5661 | 906 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
907 | } |
908 | } | |
909 | ||
d634cc15 | 910 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
911 | posix_lock_file_wait(file, pfLock); |
912 | FreeXid(xid); | |
913 | return rc; | |
914 | } | |
915 | ||
fbec9ab9 JL |
916 | /* |
917 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
918 | * these calls can be very long. | |
919 | * | |
920 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
921 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
922 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
923 | * welcome if someone wants to suggest one. | |
924 | * | |
925 | * We may be able to do a better job with this if there were some way to | |
926 | * declare that a file should be sparse. | |
927 | */ | |
928 | static int | |
929 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
930 | { | |
931 | if (offset <= cifsi->server_eof) | |
932 | return CIFS_STD_OP; | |
933 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
934 | return CIFS_VLONG_OP; | |
935 | else | |
936 | return CIFS_LONG_OP; | |
937 | } | |
938 | ||
939 | /* update the file size (if needed) after a write */ | |
940 | static void | |
941 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
942 | unsigned int bytes_written) | |
943 | { | |
944 | loff_t end_of_write = offset + bytes_written; | |
945 | ||
946 | if (end_of_write > cifsi->server_eof) | |
947 | cifsi->server_eof = end_of_write; | |
948 | } | |
949 | ||
1da177e4 LT |
950 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
951 | size_t write_size, loff_t *poffset) | |
952 | { | |
953 | int rc = 0; | |
954 | unsigned int bytes_written = 0; | |
955 | unsigned int total_written; | |
956 | struct cifs_sb_info *cifs_sb; | |
957 | struct cifsTconInfo *pTcon; | |
958 | int xid, long_op; | |
959 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 960 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 961 | |
e6a00296 | 962 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
963 | |
964 | pTcon = cifs_sb->tcon; | |
965 | ||
966 | /* cFYI(1, | |
967 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 968 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
969 | |
970 | if (file->private_data == NULL) | |
971 | return -EBADF; | |
c33f8d32 | 972 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 973 | |
838726c4 JL |
974 | rc = generic_write_checks(file, poffset, &write_size, 0); |
975 | if (rc) | |
976 | return rc; | |
977 | ||
1da177e4 | 978 | xid = GetXid(); |
1da177e4 | 979 | |
fbec9ab9 | 980 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
981 | for (total_written = 0; write_size > total_written; |
982 | total_written += bytes_written) { | |
983 | rc = -EAGAIN; | |
984 | while (rc == -EAGAIN) { | |
985 | if (file->private_data == NULL) { | |
986 | /* file has been closed on us */ | |
987 | FreeXid(xid); | |
988 | /* if we have gotten here we have written some data | |
989 | and blocked, and the file has been freed on us while | |
990 | we blocked so return what we managed to write */ | |
991 | return total_written; | |
fb8c4b14 | 992 | } |
1da177e4 LT |
993 | if (open_file->closePend) { |
994 | FreeXid(xid); | |
995 | if (total_written) | |
996 | return total_written; | |
997 | else | |
998 | return -EBADF; | |
999 | } | |
1000 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1001 | /* we could deadlock if we called |
1002 | filemap_fdatawait from here so tell | |
1003 | reopen_file not to flush data to server | |
1004 | now */ | |
4b18f2a9 | 1005 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1006 | if (rc != 0) |
1007 | break; | |
1008 | } | |
1009 | ||
1010 | rc = CIFSSMBWrite(xid, pTcon, | |
1011 | open_file->netfid, | |
1012 | min_t(const int, cifs_sb->wsize, | |
1013 | write_size - total_written), | |
1014 | *poffset, &bytes_written, | |
1015 | NULL, write_data + total_written, long_op); | |
1016 | } | |
1017 | if (rc || (bytes_written == 0)) { | |
1018 | if (total_written) | |
1019 | break; | |
1020 | else { | |
1021 | FreeXid(xid); | |
1022 | return rc; | |
1023 | } | |
fbec9ab9 JL |
1024 | } else { |
1025 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1026 | *poffset += bytes_written; |
fbec9ab9 | 1027 | } |
133672ef | 1028 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1029 | 15 seconds is plenty */ |
1030 | } | |
1031 | ||
a4544347 | 1032 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1033 | |
1034 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1035 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1036 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1037 | /* Do not update local mtime - server will set its actual value on write |
1038 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1039 | * current_fs_time(inode->i_sb);*/ |
1040 | if (total_written > 0) { | |
1041 | spin_lock(&inode->i_lock); | |
1042 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1043 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1044 | *poffset); |
3677db10 | 1045 | spin_unlock(&inode->i_lock); |
1da177e4 | 1046 | } |
fb8c4b14 | 1047 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1048 | } |
1049 | FreeXid(xid); | |
1050 | return total_written; | |
1051 | } | |
1052 | ||
1053 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1054 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1055 | { |
1056 | int rc = 0; | |
1057 | unsigned int bytes_written = 0; | |
1058 | unsigned int total_written; | |
1059 | struct cifs_sb_info *cifs_sb; | |
1060 | struct cifsTconInfo *pTcon; | |
1061 | int xid, long_op; | |
1062 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1063 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1064 | |
e6a00296 | 1065 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1066 | |
1067 | pTcon = cifs_sb->tcon; | |
1068 | ||
fb8c4b14 | 1069 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1070 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1071 | |
1072 | if (file->private_data == NULL) | |
1073 | return -EBADF; | |
c33f8d32 | 1074 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1075 | |
1da177e4 | 1076 | xid = GetXid(); |
1da177e4 | 1077 | |
fbec9ab9 | 1078 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1079 | for (total_written = 0; write_size > total_written; |
1080 | total_written += bytes_written) { | |
1081 | rc = -EAGAIN; | |
1082 | while (rc == -EAGAIN) { | |
1083 | if (file->private_data == NULL) { | |
1084 | /* file has been closed on us */ | |
1085 | FreeXid(xid); | |
1086 | /* if we have gotten here we have written some data | |
1087 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1088 | while we blocked so return what we managed to |
1da177e4 LT |
1089 | write */ |
1090 | return total_written; | |
fb8c4b14 | 1091 | } |
1da177e4 LT |
1092 | if (open_file->closePend) { |
1093 | FreeXid(xid); | |
1094 | if (total_written) | |
1095 | return total_written; | |
1096 | else | |
1097 | return -EBADF; | |
1098 | } | |
1099 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1100 | /* we could deadlock if we called |
1101 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1102 | reopen_file not to flush data to |
1da177e4 | 1103 | server now */ |
4b18f2a9 | 1104 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1105 | if (rc != 0) |
1106 | break; | |
1107 | } | |
fb8c4b14 SF |
1108 | if (experimEnabled || (pTcon->ses->server && |
1109 | ((pTcon->ses->server->secMode & | |
08775834 | 1110 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1111 | == 0))) { |
3e84469d SF |
1112 | struct kvec iov[2]; |
1113 | unsigned int len; | |
1114 | ||
0ae0efad | 1115 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1116 | write_size - total_written); |
1117 | /* iov[0] is reserved for smb header */ | |
1118 | iov[1].iov_base = (char *)write_data + | |
1119 | total_written; | |
1120 | iov[1].iov_len = len; | |
d6e04ae6 | 1121 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1122 | open_file->netfid, len, |
d6e04ae6 | 1123 | *poffset, &bytes_written, |
3e84469d | 1124 | iov, 1, long_op); |
d6e04ae6 | 1125 | } else |
60808233 SF |
1126 | rc = CIFSSMBWrite(xid, pTcon, |
1127 | open_file->netfid, | |
1128 | min_t(const int, cifs_sb->wsize, | |
1129 | write_size - total_written), | |
1130 | *poffset, &bytes_written, | |
1131 | write_data + total_written, | |
1132 | NULL, long_op); | |
1da177e4 LT |
1133 | } |
1134 | if (rc || (bytes_written == 0)) { | |
1135 | if (total_written) | |
1136 | break; | |
1137 | else { | |
1138 | FreeXid(xid); | |
1139 | return rc; | |
1140 | } | |
fbec9ab9 JL |
1141 | } else { |
1142 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1143 | *poffset += bytes_written; |
fbec9ab9 | 1144 | } |
133672ef | 1145 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1146 | 15 seconds is plenty */ |
1147 | } | |
1148 | ||
a4544347 | 1149 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1150 | |
1151 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1152 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1153 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1154 | /* file->f_path.dentry->d_inode->i_ctime = |
1155 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1156 | if (total_written > 0) { | |
1157 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1158 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1159 | i_size_write(file->f_path.dentry->d_inode, | |
1160 | *poffset); | |
1161 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1162 | } |
3677db10 | 1163 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1164 | } |
1165 | FreeXid(xid); | |
1166 | return total_written; | |
1167 | } | |
1168 | ||
630f3f0c SF |
1169 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1170 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1171 | { | |
1172 | struct cifsFileInfo *open_file = NULL; | |
1173 | ||
1174 | read_lock(&GlobalSMBSeslock); | |
1175 | /* we could simply get the first_list_entry since write-only entries | |
1176 | are always at the end of the list but since the first entry might | |
1177 | have a close pending, we go through the whole list */ | |
1178 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1179 | if (open_file->closePend) | |
1180 | continue; | |
1181 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1182 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1183 | if (!open_file->invalidHandle) { | |
1184 | /* found a good file */ | |
1185 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1186 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1187 | read_unlock(&GlobalSMBSeslock); |
1188 | return open_file; | |
1189 | } /* else might as well continue, and look for | |
1190 | another, or simply have the caller reopen it | |
1191 | again rather than trying to fix this handle */ | |
1192 | } else /* write only file */ | |
1193 | break; /* write only files are last so must be done */ | |
1194 | } | |
1195 | read_unlock(&GlobalSMBSeslock); | |
1196 | return NULL; | |
1197 | } | |
1198 | #endif | |
1199 | ||
dd99cd80 | 1200 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1201 | { |
1202 | struct cifsFileInfo *open_file; | |
2846d386 | 1203 | bool any_available = false; |
dd99cd80 | 1204 | int rc; |
6148a742 | 1205 | |
60808233 SF |
1206 | /* Having a null inode here (because mapping->host was set to zero by |
1207 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1208 | it being zero) during stress testcases so we need to check for it */ | |
1209 | ||
fb8c4b14 SF |
1210 | if (cifs_inode == NULL) { |
1211 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1212 | dump_stack(); |
1213 | return NULL; | |
1214 | } | |
1215 | ||
6148a742 | 1216 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1217 | refind_writable: |
6148a742 | 1218 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1219 | if (open_file->closePend || |
1220 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1221 | continue; |
2846d386 | 1222 | |
6148a742 SF |
1223 | if (open_file->pfile && |
1224 | ((open_file->pfile->f_flags & O_RDWR) || | |
1225 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1226 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1227 | |
1228 | if (!open_file->invalidHandle) { | |
1229 | /* found a good writable file */ | |
1230 | read_unlock(&GlobalSMBSeslock); | |
1231 | return open_file; | |
1232 | } | |
8840dee9 | 1233 | |
6148a742 | 1234 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1235 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1236 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1237 | if (!rc) { |
9b22b0b7 SF |
1238 | if (!open_file->closePend) |
1239 | return open_file; | |
1240 | else { /* start over in case this was deleted */ | |
1241 | /* since the list could be modified */ | |
37c0eb46 | 1242 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1243 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1244 | goto refind_writable; |
37c0eb46 SF |
1245 | } |
1246 | } | |
9b22b0b7 SF |
1247 | |
1248 | /* if it fails, try another handle if possible - | |
1249 | (we can not do this if closePending since | |
1250 | loop could be modified - in which case we | |
1251 | have to start at the beginning of the list | |
1252 | again. Note that it would be bad | |
1253 | to hold up writepages here (rather than | |
1254 | in caller) with continuous retries */ | |
1255 | cFYI(1, ("wp failed on reopen file")); | |
1256 | read_lock(&GlobalSMBSeslock); | |
1257 | /* can not use this handle, no write | |
1258 | pending on this one after all */ | |
6ab409b5 | 1259 | cifsFileInfo_put(open_file); |
8840dee9 | 1260 | |
9b22b0b7 SF |
1261 | if (open_file->closePend) /* list could have changed */ |
1262 | goto refind_writable; | |
1263 | /* else we simply continue to the next entry. Thus | |
1264 | we do not loop on reopen errors. If we | |
1265 | can not reopen the file, for example if we | |
1266 | reconnected to a server with another client | |
1267 | racing to delete or lock the file we would not | |
1268 | make progress if we restarted before the beginning | |
1269 | of the loop here. */ | |
6148a742 SF |
1270 | } |
1271 | } | |
2846d386 JL |
1272 | /* couldn't find useable FH with same pid, try any available */ |
1273 | if (!any_available) { | |
1274 | any_available = true; | |
1275 | goto refind_writable; | |
1276 | } | |
6148a742 SF |
1277 | read_unlock(&GlobalSMBSeslock); |
1278 | return NULL; | |
1279 | } | |
1280 | ||
1da177e4 LT |
1281 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1282 | { | |
1283 | struct address_space *mapping = page->mapping; | |
1284 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1285 | char *write_data; | |
1286 | int rc = -EFAULT; | |
1287 | int bytes_written = 0; | |
1288 | struct cifs_sb_info *cifs_sb; | |
1289 | struct cifsTconInfo *pTcon; | |
1290 | struct inode *inode; | |
6148a742 | 1291 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1292 | |
1293 | if (!mapping || !mapping->host) | |
1294 | return -EFAULT; | |
1295 | ||
1296 | inode = page->mapping->host; | |
1297 | cifs_sb = CIFS_SB(inode->i_sb); | |
1298 | pTcon = cifs_sb->tcon; | |
1299 | ||
1300 | offset += (loff_t)from; | |
1301 | write_data = kmap(page); | |
1302 | write_data += from; | |
1303 | ||
1304 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1305 | kunmap(page); | |
1306 | return -EIO; | |
1307 | } | |
1308 | ||
1309 | /* racing with truncate? */ | |
1310 | if (offset > mapping->host->i_size) { | |
1311 | kunmap(page); | |
1312 | return 0; /* don't care */ | |
1313 | } | |
1314 | ||
1315 | /* check to make sure that we are not extending the file */ | |
1316 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1317 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1318 | |
6148a742 SF |
1319 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1320 | if (open_file) { | |
1321 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1322 | to-from, &offset); | |
6ab409b5 | 1323 | cifsFileInfo_put(open_file); |
1da177e4 | 1324 | /* Does mm or vfs already set times? */ |
6148a742 | 1325 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1326 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1327 | rc = 0; |
bb5a9a04 SF |
1328 | else if (bytes_written < 0) |
1329 | rc = bytes_written; | |
6148a742 | 1330 | } else { |
1da177e4 LT |
1331 | cFYI(1, ("No writeable filehandles for inode")); |
1332 | rc = -EIO; | |
1333 | } | |
1334 | ||
1335 | kunmap(page); | |
1336 | return rc; | |
1337 | } | |
1338 | ||
1da177e4 | 1339 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1340 | struct writeback_control *wbc) |
1da177e4 | 1341 | { |
37c0eb46 SF |
1342 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1343 | unsigned int bytes_to_write; | |
1344 | unsigned int bytes_written; | |
1345 | struct cifs_sb_info *cifs_sb; | |
1346 | int done = 0; | |
111ebb6e | 1347 | pgoff_t end; |
37c0eb46 | 1348 | pgoff_t index; |
fb8c4b14 SF |
1349 | int range_whole = 0; |
1350 | struct kvec *iov; | |
84d2f07e | 1351 | int len; |
37c0eb46 SF |
1352 | int n_iov = 0; |
1353 | pgoff_t next; | |
1354 | int nr_pages; | |
1355 | __u64 offset = 0; | |
23e7dd7d | 1356 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1357 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1358 | struct page *page; |
1359 | struct pagevec pvec; | |
1360 | int rc = 0; | |
1361 | int scanned = 0; | |
fbec9ab9 | 1362 | int xid, long_op; |
1da177e4 | 1363 | |
37c0eb46 | 1364 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1365 | |
37c0eb46 SF |
1366 | /* |
1367 | * If wsize is smaller that the page cache size, default to writing | |
1368 | * one page at a time via cifs_writepage | |
1369 | */ | |
1370 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1371 | return generic_writepages(mapping, wbc); | |
1372 | ||
fb8c4b14 SF |
1373 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1374 | if (cifs_sb->tcon->ses->server->secMode & | |
1375 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1376 | if (!experimEnabled) | |
60808233 | 1377 | return generic_writepages(mapping, wbc); |
4a77118c | 1378 | |
9a0c8230 | 1379 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1380 | if (iov == NULL) |
9a0c8230 SF |
1381 | return generic_writepages(mapping, wbc); |
1382 | ||
1383 | ||
37c0eb46 SF |
1384 | /* |
1385 | * BB: Is this meaningful for a non-block-device file system? | |
1386 | * If it is, we should test it again after we do I/O | |
1387 | */ | |
1388 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1389 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1390 | kfree(iov); |
37c0eb46 SF |
1391 | return 0; |
1392 | } | |
1393 | ||
1da177e4 LT |
1394 | xid = GetXid(); |
1395 | ||
37c0eb46 | 1396 | pagevec_init(&pvec, 0); |
111ebb6e | 1397 | if (wbc->range_cyclic) { |
37c0eb46 | 1398 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1399 | end = -1; |
1400 | } else { | |
1401 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1402 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1403 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1404 | range_whole = 1; | |
37c0eb46 SF |
1405 | scanned = 1; |
1406 | } | |
1407 | retry: | |
1408 | while (!done && (index <= end) && | |
1409 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1410 | PAGECACHE_TAG_DIRTY, | |
1411 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1412 | int first; | |
1413 | unsigned int i; | |
1414 | ||
37c0eb46 SF |
1415 | first = -1; |
1416 | next = 0; | |
1417 | n_iov = 0; | |
1418 | bytes_to_write = 0; | |
1419 | ||
1420 | for (i = 0; i < nr_pages; i++) { | |
1421 | page = pvec.pages[i]; | |
1422 | /* | |
1423 | * At this point we hold neither mapping->tree_lock nor | |
1424 | * lock on the page itself: the page may be truncated or | |
1425 | * invalidated (changing page->mapping to NULL), or even | |
1426 | * swizzled back from swapper_space to tmpfs file | |
1427 | * mapping | |
1428 | */ | |
1429 | ||
1430 | if (first < 0) | |
1431 | lock_page(page); | |
529ae9aa | 1432 | else if (!trylock_page(page)) |
37c0eb46 SF |
1433 | break; |
1434 | ||
1435 | if (unlikely(page->mapping != mapping)) { | |
1436 | unlock_page(page); | |
1437 | break; | |
1438 | } | |
1439 | ||
111ebb6e | 1440 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1441 | done = 1; |
1442 | unlock_page(page); | |
1443 | break; | |
1444 | } | |
1445 | ||
1446 | if (next && (page->index != next)) { | |
1447 | /* Not next consecutive page */ | |
1448 | unlock_page(page); | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1453 | wait_on_page_writeback(page); | |
1454 | ||
1455 | if (PageWriteback(page) || | |
cb876f45 | 1456 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1457 | unlock_page(page); |
1458 | break; | |
1459 | } | |
84d2f07e | 1460 | |
cb876f45 LT |
1461 | /* |
1462 | * This actually clears the dirty bit in the radix tree. | |
1463 | * See cifs_writepage() for more commentary. | |
1464 | */ | |
1465 | set_page_writeback(page); | |
1466 | ||
84d2f07e SF |
1467 | if (page_offset(page) >= mapping->host->i_size) { |
1468 | done = 1; | |
1469 | unlock_page(page); | |
cb876f45 | 1470 | end_page_writeback(page); |
84d2f07e SF |
1471 | break; |
1472 | } | |
1473 | ||
37c0eb46 SF |
1474 | /* |
1475 | * BB can we get rid of this? pages are held by pvec | |
1476 | */ | |
1477 | page_cache_get(page); | |
1478 | ||
84d2f07e SF |
1479 | len = min(mapping->host->i_size - page_offset(page), |
1480 | (loff_t)PAGE_CACHE_SIZE); | |
1481 | ||
37c0eb46 SF |
1482 | /* reserve iov[0] for the smb header */ |
1483 | n_iov++; | |
1484 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1485 | iov[n_iov].iov_len = len; |
1486 | bytes_to_write += len; | |
37c0eb46 SF |
1487 | |
1488 | if (first < 0) { | |
1489 | first = i; | |
1490 | offset = page_offset(page); | |
1491 | } | |
1492 | next = page->index + 1; | |
1493 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1494 | break; | |
1495 | } | |
1496 | if (n_iov) { | |
23e7dd7d SF |
1497 | /* Search for a writable handle every time we call |
1498 | * CIFSSMBWrite2. We can't rely on the last handle | |
1499 | * we used to still be valid | |
1500 | */ | |
1501 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1502 | if (!open_file) { | |
1503 | cERROR(1, ("No writable handles for inode")); | |
1504 | rc = -EBADF; | |
1047abc1 | 1505 | } else { |
fbec9ab9 | 1506 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1507 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1508 | open_file->netfid, | |
1509 | bytes_to_write, offset, | |
1510 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1511 | long_op); |
6ab409b5 | 1512 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1513 | cifs_update_eof(cifsi, offset, bytes_written); |
1514 | ||
23e7dd7d | 1515 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1516 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1517 | rc, bytes_written)); |
1518 | /* BB what if continued retry is | |
1519 | requested via mount flags? */ | |
cea21805 JL |
1520 | if (rc == -ENOSPC) |
1521 | set_bit(AS_ENOSPC, &mapping->flags); | |
1522 | else | |
1523 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1524 | } else { |
1525 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1526 | bytes_written); | |
1527 | } | |
37c0eb46 SF |
1528 | } |
1529 | for (i = 0; i < n_iov; i++) { | |
1530 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1531 | /* Should we also set page error on |
1532 | success rc but too little data written? */ | |
1533 | /* BB investigate retry logic on temporary | |
1534 | server crash cases and how recovery works | |
fb8c4b14 SF |
1535 | when page marked as error */ |
1536 | if (rc) | |
eb9bdaa3 | 1537 | SetPageError(page); |
37c0eb46 SF |
1538 | kunmap(page); |
1539 | unlock_page(page); | |
cb876f45 | 1540 | end_page_writeback(page); |
37c0eb46 SF |
1541 | page_cache_release(page); |
1542 | } | |
1543 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1544 | done = 1; | |
1545 | index = next; | |
b066a48c DK |
1546 | } else |
1547 | /* Need to re-find the pages we skipped */ | |
1548 | index = pvec.pages[0]->index + 1; | |
1549 | ||
37c0eb46 SF |
1550 | pagevec_release(&pvec); |
1551 | } | |
1552 | if (!scanned && !done) { | |
1553 | /* | |
1554 | * We hit the last page and there is more work to be done: wrap | |
1555 | * back to the start of the file | |
1556 | */ | |
1557 | scanned = 1; | |
1558 | index = 0; | |
1559 | goto retry; | |
1560 | } | |
111ebb6e | 1561 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1562 | mapping->writeback_index = index; |
1563 | ||
1da177e4 | 1564 | FreeXid(xid); |
9a0c8230 | 1565 | kfree(iov); |
1da177e4 LT |
1566 | return rc; |
1567 | } | |
1da177e4 | 1568 | |
fb8c4b14 | 1569 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1570 | { |
1571 | int rc = -EFAULT; | |
1572 | int xid; | |
1573 | ||
1574 | xid = GetXid(); | |
1575 | /* BB add check for wbc flags */ | |
1576 | page_cache_get(page); | |
ad7a2926 | 1577 | if (!PageUptodate(page)) |
1da177e4 | 1578 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1579 | |
1580 | /* | |
1581 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1582 | * | |
1583 | * A writepage() implementation always needs to do either this, | |
1584 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1585 | * the case of a failure. | |
1586 | * | |
1587 | * Just unlocking the page will cause the radix tree tag-bits | |
1588 | * to fail to update with the state of the page correctly. | |
1589 | */ | |
fb8c4b14 | 1590 | set_page_writeback(page); |
1da177e4 LT |
1591 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1592 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1593 | unlock_page(page); | |
cb876f45 LT |
1594 | end_page_writeback(page); |
1595 | page_cache_release(page); | |
1da177e4 LT |
1596 | FreeXid(xid); |
1597 | return rc; | |
1598 | } | |
1599 | ||
d9414774 NP |
1600 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1601 | loff_t pos, unsigned len, unsigned copied, | |
1602 | struct page *page, void *fsdata) | |
1da177e4 | 1603 | { |
d9414774 NP |
1604 | int rc; |
1605 | struct inode *inode = mapping->host; | |
1da177e4 | 1606 | |
d9414774 NP |
1607 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1608 | page, pos, copied)); | |
1609 | ||
a98ee8c1 JL |
1610 | if (PageChecked(page)) { |
1611 | if (copied == len) | |
1612 | SetPageUptodate(page); | |
1613 | ClearPageChecked(page); | |
1614 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1615 | SetPageUptodate(page); |
ad7a2926 | 1616 | |
1da177e4 | 1617 | if (!PageUptodate(page)) { |
d9414774 NP |
1618 | char *page_data; |
1619 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1620 | int xid; | |
1621 | ||
1622 | xid = GetXid(); | |
1da177e4 LT |
1623 | /* this is probably better than directly calling |
1624 | partialpage_write since in this function the file handle is | |
1625 | known which we might as well leverage */ | |
1626 | /* BB check if anything else missing out of ppw | |
1627 | such as updating last write time */ | |
1628 | page_data = kmap(page); | |
d9414774 NP |
1629 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1630 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1631 | kunmap(page); |
d9414774 NP |
1632 | |
1633 | FreeXid(xid); | |
fb8c4b14 | 1634 | } else { |
d9414774 NP |
1635 | rc = copied; |
1636 | pos += copied; | |
1da177e4 LT |
1637 | set_page_dirty(page); |
1638 | } | |
1639 | ||
d9414774 NP |
1640 | if (rc > 0) { |
1641 | spin_lock(&inode->i_lock); | |
1642 | if (pos > inode->i_size) | |
1643 | i_size_write(inode, pos); | |
1644 | spin_unlock(&inode->i_lock); | |
1645 | } | |
1646 | ||
1647 | unlock_page(page); | |
1648 | page_cache_release(page); | |
1649 | ||
1da177e4 LT |
1650 | return rc; |
1651 | } | |
1652 | ||
1653 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1654 | { | |
1655 | int xid; | |
1656 | int rc = 0; | |
b298f223 SF |
1657 | struct cifsTconInfo *tcon; |
1658 | struct cifsFileInfo *smbfile = | |
1659 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1660 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1661 | |
1662 | xid = GetXid(); | |
1663 | ||
fb8c4b14 | 1664 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1665 | dentry->d_name.name, datasync)); |
50c2f753 | 1666 | |
cea21805 JL |
1667 | rc = filemap_write_and_wait(inode->i_mapping); |
1668 | if (rc == 0) { | |
1669 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1670 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1671 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1672 | if (!rc && tcon && smbfile && |
4717bed6 | 1673 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1674 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1675 | } |
b298f223 | 1676 | |
1da177e4 LT |
1677 | FreeXid(xid); |
1678 | return rc; | |
1679 | } | |
1680 | ||
3978d717 | 1681 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1682 | { |
1683 | struct address_space *mapping; | |
1684 | struct inode *inode; | |
1685 | unsigned long index = page->index; | |
1686 | unsigned int rpages = 0; | |
1687 | int rc = 0; | |
1688 | ||
1689 | cFYI(1, ("sync page %p",page)); | |
1690 | mapping = page->mapping; | |
1691 | if (!mapping) | |
1692 | return 0; | |
1693 | inode = mapping->host; | |
1694 | if (!inode) | |
3978d717 | 1695 | return; */ |
1da177e4 | 1696 | |
fb8c4b14 | 1697 | /* fill in rpages then |
1da177e4 LT |
1698 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1699 | ||
26a21b98 | 1700 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1701 | |
3978d717 | 1702 | #if 0 |
1da177e4 LT |
1703 | if (rc < 0) |
1704 | return rc; | |
1705 | return 0; | |
3978d717 | 1706 | #endif |
1da177e4 LT |
1707 | } */ |
1708 | ||
1709 | /* | |
1710 | * As file closes, flush all cached write data for this inode checking | |
1711 | * for write behind errors. | |
1712 | */ | |
75e1fcc0 | 1713 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1714 | { |
fb8c4b14 | 1715 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1716 | int rc = 0; |
1717 | ||
1718 | /* Rather than do the steps manually: | |
1719 | lock the inode for writing | |
1720 | loop through pages looking for write behind data (dirty pages) | |
1721 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1722 | send to server (prefer in parallel) | |
1723 | deal with writebehind errors | |
1724 | unlock inode for writing | |
1725 | filemapfdatawrite appears easier for the time being */ | |
1726 | ||
1727 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1728 | /* reset wb rc if we were able to write out dirty pages */ |
1729 | if (!rc) { | |
1730 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1731 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1732 | } |
50c2f753 | 1733 | |
fb8c4b14 | 1734 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1735 | |
1736 | return rc; | |
1737 | } | |
1738 | ||
1739 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1740 | size_t read_size, loff_t *poffset) | |
1741 | { | |
1742 | int rc = -EACCES; | |
1743 | unsigned int bytes_read = 0; | |
1744 | unsigned int total_read = 0; | |
1745 | unsigned int current_read_size; | |
1746 | struct cifs_sb_info *cifs_sb; | |
1747 | struct cifsTconInfo *pTcon; | |
1748 | int xid; | |
1749 | struct cifsFileInfo *open_file; | |
1750 | char *smb_read_data; | |
1751 | char __user *current_offset; | |
1752 | struct smb_com_read_rsp *pSMBr; | |
1753 | ||
1754 | xid = GetXid(); | |
e6a00296 | 1755 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1756 | pTcon = cifs_sb->tcon; |
1757 | ||
1758 | if (file->private_data == NULL) { | |
0f3bc09e | 1759 | rc = -EBADF; |
1da177e4 | 1760 | FreeXid(xid); |
0f3bc09e | 1761 | return rc; |
1da177e4 LT |
1762 | } |
1763 | open_file = (struct cifsFileInfo *)file->private_data; | |
1764 | ||
ad7a2926 | 1765 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1766 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1767 | |
1da177e4 LT |
1768 | for (total_read = 0, current_offset = read_data; |
1769 | read_size > total_read; | |
1770 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1771 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1772 | cifs_sb->rsize); |
1773 | rc = -EAGAIN; | |
1774 | smb_read_data = NULL; | |
1775 | while (rc == -EAGAIN) { | |
ec637e3f | 1776 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1777 | if ((open_file->invalidHandle) && |
1da177e4 | 1778 | (!open_file->closePend)) { |
4b18f2a9 | 1779 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1780 | if (rc != 0) |
1781 | break; | |
1782 | } | |
bfa0d75a | 1783 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1784 | open_file->netfid, |
1785 | current_read_size, *poffset, | |
1786 | &bytes_read, &smb_read_data, | |
1787 | &buf_type); | |
1da177e4 | 1788 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1789 | if (smb_read_data) { |
93544cc6 SF |
1790 | if (copy_to_user(current_offset, |
1791 | smb_read_data + | |
1792 | 4 /* RFC1001 length field */ + | |
1793 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1794 | bytes_read)) |
93544cc6 | 1795 | rc = -EFAULT; |
93544cc6 | 1796 | |
fb8c4b14 | 1797 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1798 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1799 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1800 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1801 | smb_read_data = NULL; |
1802 | } | |
1803 | } | |
1804 | if (rc || (bytes_read == 0)) { | |
1805 | if (total_read) { | |
1806 | break; | |
1807 | } else { | |
1808 | FreeXid(xid); | |
1809 | return rc; | |
1810 | } | |
1811 | } else { | |
a4544347 | 1812 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1813 | *poffset += bytes_read; |
1814 | } | |
1815 | } | |
1816 | FreeXid(xid); | |
1817 | return total_read; | |
1818 | } | |
1819 | ||
1820 | ||
1821 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1822 | loff_t *poffset) | |
1823 | { | |
1824 | int rc = -EACCES; | |
1825 | unsigned int bytes_read = 0; | |
1826 | unsigned int total_read; | |
1827 | unsigned int current_read_size; | |
1828 | struct cifs_sb_info *cifs_sb; | |
1829 | struct cifsTconInfo *pTcon; | |
1830 | int xid; | |
1831 | char *current_offset; | |
1832 | struct cifsFileInfo *open_file; | |
ec637e3f | 1833 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1834 | |
1835 | xid = GetXid(); | |
e6a00296 | 1836 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1837 | pTcon = cifs_sb->tcon; |
1838 | ||
1839 | if (file->private_data == NULL) { | |
0f3bc09e | 1840 | rc = -EBADF; |
1da177e4 | 1841 | FreeXid(xid); |
0f3bc09e | 1842 | return rc; |
1da177e4 LT |
1843 | } |
1844 | open_file = (struct cifsFileInfo *)file->private_data; | |
1845 | ||
1846 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1847 | cFYI(1, ("attempting read on write only file instance")); | |
1848 | ||
fb8c4b14 | 1849 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1850 | read_size > total_read; |
1851 | total_read += bytes_read, current_offset += bytes_read) { | |
1852 | current_read_size = min_t(const int, read_size - total_read, | |
1853 | cifs_sb->rsize); | |
f9f5c817 SF |
1854 | /* For windows me and 9x we do not want to request more |
1855 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1856 | if ((pTcon->ses) && |
f9f5c817 SF |
1857 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1858 | current_read_size = min_t(const int, current_read_size, | |
1859 | pTcon->ses->server->maxBuf - 128); | |
1860 | } | |
1da177e4 LT |
1861 | rc = -EAGAIN; |
1862 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1863 | if ((open_file->invalidHandle) && |
1da177e4 | 1864 | (!open_file->closePend)) { |
4b18f2a9 | 1865 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1866 | if (rc != 0) |
1867 | break; | |
1868 | } | |
bfa0d75a | 1869 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1870 | open_file->netfid, |
1871 | current_read_size, *poffset, | |
1872 | &bytes_read, ¤t_offset, | |
1873 | &buf_type); | |
1da177e4 LT |
1874 | } |
1875 | if (rc || (bytes_read == 0)) { | |
1876 | if (total_read) { | |
1877 | break; | |
1878 | } else { | |
1879 | FreeXid(xid); | |
1880 | return rc; | |
1881 | } | |
1882 | } else { | |
a4544347 | 1883 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1884 | *poffset += bytes_read; |
1885 | } | |
1886 | } | |
1887 | FreeXid(xid); | |
1888 | return total_read; | |
1889 | } | |
1890 | ||
1891 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1892 | { | |
1da177e4 LT |
1893 | int rc, xid; |
1894 | ||
1895 | xid = GetXid(); | |
abab095d | 1896 | rc = cifs_revalidate_file(file); |
1da177e4 LT |
1897 | if (rc) { |
1898 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1899 | FreeXid(xid); | |
1900 | return rc; | |
1901 | } | |
1902 | rc = generic_file_mmap(file, vma); | |
1903 | FreeXid(xid); | |
1904 | return rc; | |
1905 | } | |
1906 | ||
1907 | ||
fb8c4b14 | 1908 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1909 | struct list_head *pages, int bytes_read, char *data, |
1910 | struct pagevec *plru_pvec) | |
1911 | { | |
1912 | struct page *page; | |
1913 | char *target; | |
1914 | ||
1915 | while (bytes_read > 0) { | |
1916 | if (list_empty(pages)) | |
1917 | break; | |
1918 | ||
1919 | page = list_entry(pages->prev, struct page, lru); | |
1920 | list_del(&page->lru); | |
1921 | ||
1922 | if (add_to_page_cache(page, mapping, page->index, | |
1923 | GFP_KERNEL)) { | |
1924 | page_cache_release(page); | |
1925 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1926 | data += PAGE_CACHE_SIZE; |
1927 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1928 | continue; |
1929 | } | |
1930 | ||
fb8c4b14 | 1931 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1932 | |
1933 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1934 | memcpy(target, data, bytes_read); | |
1935 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1936 | memset(target + bytes_read, 0, |
1da177e4 LT |
1937 | PAGE_CACHE_SIZE - bytes_read); |
1938 | bytes_read = 0; | |
1939 | } else { | |
1940 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1941 | bytes_read -= PAGE_CACHE_SIZE; | |
1942 | } | |
1943 | kunmap_atomic(target, KM_USER0); | |
1944 | ||
1945 | flush_dcache_page(page); | |
1946 | SetPageUptodate(page); | |
1947 | unlock_page(page); | |
1948 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 1949 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
1950 | data += PAGE_CACHE_SIZE; |
1951 | } | |
1952 | return; | |
1953 | } | |
1954 | ||
1955 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1956 | struct list_head *page_list, unsigned num_pages) | |
1957 | { | |
1958 | int rc = -EACCES; | |
1959 | int xid; | |
1960 | loff_t offset; | |
1961 | struct page *page; | |
1962 | struct cifs_sb_info *cifs_sb; | |
1963 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1964 | unsigned int bytes_read = 0; |
fb8c4b14 | 1965 | unsigned int read_size, i; |
1da177e4 LT |
1966 | char *smb_read_data = NULL; |
1967 | struct smb_com_read_rsp *pSMBr; | |
1968 | struct pagevec lru_pvec; | |
1969 | struct cifsFileInfo *open_file; | |
ec637e3f | 1970 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1971 | |
1972 | xid = GetXid(); | |
1973 | if (file->private_data == NULL) { | |
0f3bc09e | 1974 | rc = -EBADF; |
1da177e4 | 1975 | FreeXid(xid); |
0f3bc09e | 1976 | return rc; |
1da177e4 LT |
1977 | } |
1978 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1979 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1980 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1981 | |
1da177e4 | 1982 | pagevec_init(&lru_pvec, 0); |
61de800d | 1983 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
1984 | for (i = 0; i < num_pages; ) { |
1985 | unsigned contig_pages; | |
1986 | struct page *tmp_page; | |
1987 | unsigned long expected_index; | |
1988 | ||
1989 | if (list_empty(page_list)) | |
1990 | break; | |
1991 | ||
1992 | page = list_entry(page_list->prev, struct page, lru); | |
1993 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1994 | ||
1995 | /* count adjacent pages that we will read into */ | |
1996 | contig_pages = 0; | |
fb8c4b14 | 1997 | expected_index = |
1da177e4 | 1998 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1999 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2000 | if (tmp_page->index == expected_index) { |
2001 | contig_pages++; | |
2002 | expected_index++; | |
2003 | } else | |
fb8c4b14 | 2004 | break; |
1da177e4 LT |
2005 | } |
2006 | if (contig_pages + i > num_pages) | |
2007 | contig_pages = num_pages - i; | |
2008 | ||
2009 | /* for reads over a certain size could initiate async | |
2010 | read ahead */ | |
2011 | ||
2012 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2013 | /* Read size needs to be in multiples of one page */ | |
2014 | read_size = min_t(const unsigned int, read_size, | |
2015 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2016 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2017 | read_size, contig_pages)); |
1da177e4 LT |
2018 | rc = -EAGAIN; |
2019 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2020 | if ((open_file->invalidHandle) && |
1da177e4 | 2021 | (!open_file->closePend)) { |
4b18f2a9 | 2022 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2023 | if (rc != 0) |
2024 | break; | |
2025 | } | |
2026 | ||
bfa0d75a | 2027 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2028 | open_file->netfid, |
2029 | read_size, offset, | |
2030 | &bytes_read, &smb_read_data, | |
2031 | &buf_type); | |
a9d02ad4 | 2032 | /* BB more RC checks ? */ |
fb8c4b14 | 2033 | if (rc == -EAGAIN) { |
1da177e4 | 2034 | if (smb_read_data) { |
fb8c4b14 | 2035 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2036 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2037 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2038 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2039 | smb_read_data = NULL; |
2040 | } | |
2041 | } | |
2042 | } | |
2043 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2044 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2045 | break; |
2046 | } else if (bytes_read > 0) { | |
6f88cc2e | 2047 | task_io_account_read(bytes_read); |
1da177e4 LT |
2048 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2049 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2050 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2051 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2052 | ||
2053 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2054 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2055 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2056 | i++; /* account for partial page */ |
2057 | ||
fb8c4b14 | 2058 | /* server copy of file can have smaller size |
1da177e4 | 2059 | than client */ |
fb8c4b14 SF |
2060 | /* BB do we need to verify this common case ? |
2061 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2062 | we will hit it on next read */ |
2063 | ||
05ac9d4b | 2064 | /* break; */ |
1da177e4 LT |
2065 | } |
2066 | } else { | |
2067 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2068 | "Cleaning remaining pages from readahead list", | |
2069 | bytes_read, offset)); | |
fb8c4b14 | 2070 | /* BB turn off caching and do new lookup on |
1da177e4 | 2071 | file size at server? */ |
1da177e4 LT |
2072 | break; |
2073 | } | |
2074 | if (smb_read_data) { | |
fb8c4b14 | 2075 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2076 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2077 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2078 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2079 | smb_read_data = NULL; |
2080 | } | |
2081 | bytes_read = 0; | |
2082 | } | |
2083 | ||
4f98a2fe | 2084 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2085 | |
2086 | /* need to free smb_read_data buf before exit */ | |
2087 | if (smb_read_data) { | |
fb8c4b14 | 2088 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2089 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2090 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2091 | cifs_buf_release(smb_read_data); |
1da177e4 | 2092 | smb_read_data = NULL; |
fb8c4b14 | 2093 | } |
1da177e4 LT |
2094 | |
2095 | FreeXid(xid); | |
2096 | return rc; | |
2097 | } | |
2098 | ||
2099 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2100 | loff_t *poffset) | |
2101 | { | |
2102 | char *read_data; | |
2103 | int rc; | |
2104 | ||
2105 | page_cache_get(page); | |
2106 | read_data = kmap(page); | |
2107 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2108 | |
1da177e4 | 2109 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2110 | |
1da177e4 LT |
2111 | if (rc < 0) |
2112 | goto io_error; | |
2113 | else | |
fb8c4b14 SF |
2114 | cFYI(1, ("Bytes read %d", rc)); |
2115 | ||
e6a00296 JJS |
2116 | file->f_path.dentry->d_inode->i_atime = |
2117 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2118 | |
1da177e4 LT |
2119 | if (PAGE_CACHE_SIZE > rc) |
2120 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2121 | ||
2122 | flush_dcache_page(page); | |
2123 | SetPageUptodate(page); | |
2124 | rc = 0; | |
fb8c4b14 | 2125 | |
1da177e4 | 2126 | io_error: |
fb8c4b14 | 2127 | kunmap(page); |
1da177e4 LT |
2128 | page_cache_release(page); |
2129 | return rc; | |
2130 | } | |
2131 | ||
2132 | static int cifs_readpage(struct file *file, struct page *page) | |
2133 | { | |
2134 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2135 | int rc = -EACCES; | |
2136 | int xid; | |
2137 | ||
2138 | xid = GetXid(); | |
2139 | ||
2140 | if (file->private_data == NULL) { | |
0f3bc09e | 2141 | rc = -EBADF; |
1da177e4 | 2142 | FreeXid(xid); |
0f3bc09e | 2143 | return rc; |
1da177e4 LT |
2144 | } |
2145 | ||
fb8c4b14 | 2146 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2147 | page, (int)offset, (int)offset)); |
2148 | ||
2149 | rc = cifs_readpage_worker(file, page, &offset); | |
2150 | ||
2151 | unlock_page(page); | |
2152 | ||
2153 | FreeXid(xid); | |
2154 | return rc; | |
2155 | } | |
2156 | ||
a403a0a3 SF |
2157 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2158 | { | |
2159 | struct cifsFileInfo *open_file; | |
2160 | ||
2161 | read_lock(&GlobalSMBSeslock); | |
2162 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2163 | if (open_file->closePend) | |
2164 | continue; | |
2165 | if (open_file->pfile && | |
2166 | ((open_file->pfile->f_flags & O_RDWR) || | |
2167 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2168 | read_unlock(&GlobalSMBSeslock); | |
2169 | return 1; | |
2170 | } | |
2171 | } | |
2172 | read_unlock(&GlobalSMBSeslock); | |
2173 | return 0; | |
2174 | } | |
2175 | ||
1da177e4 LT |
2176 | /* We do not want to update the file size from server for inodes |
2177 | open for write - to avoid races with writepage extending | |
2178 | the file - in the future we could consider allowing | |
fb8c4b14 | 2179 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2180 | but this is tricky to do without racing with writebehind |
2181 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2182 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2183 | { |
a403a0a3 | 2184 | if (!cifsInode) |
4b18f2a9 | 2185 | return true; |
50c2f753 | 2186 | |
a403a0a3 SF |
2187 | if (is_inode_writable(cifsInode)) { |
2188 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2189 | struct cifs_sb_info *cifs_sb; |
2190 | ||
c32a0b68 | 2191 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2192 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2193 | /* since no page cache to corrupt on directio |
c32a0b68 | 2194 | we can change size safely */ |
4b18f2a9 | 2195 | return true; |
c32a0b68 SF |
2196 | } |
2197 | ||
fb8c4b14 | 2198 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2199 | return true; |
7ba52631 | 2200 | |
4b18f2a9 | 2201 | return false; |
23e7dd7d | 2202 | } else |
4b18f2a9 | 2203 | return true; |
1da177e4 LT |
2204 | } |
2205 | ||
d9414774 NP |
2206 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2207 | loff_t pos, unsigned len, unsigned flags, | |
2208 | struct page **pagep, void **fsdata) | |
1da177e4 | 2209 | { |
d9414774 NP |
2210 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2211 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2212 | loff_t page_start = pos & PAGE_MASK; |
2213 | loff_t i_size; | |
2214 | struct page *page; | |
2215 | int rc = 0; | |
d9414774 NP |
2216 | |
2217 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2218 | ||
54566b2c | 2219 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2220 | if (!page) { |
2221 | rc = -ENOMEM; | |
2222 | goto out; | |
2223 | } | |
8a236264 | 2224 | |
a98ee8c1 JL |
2225 | if (PageUptodate(page)) |
2226 | goto out; | |
8a236264 | 2227 | |
a98ee8c1 JL |
2228 | /* |
2229 | * If we write a full page it will be up to date, no need to read from | |
2230 | * the server. If the write is short, we'll end up doing a sync write | |
2231 | * instead. | |
2232 | */ | |
2233 | if (len == PAGE_CACHE_SIZE) | |
2234 | goto out; | |
8a236264 | 2235 | |
a98ee8c1 JL |
2236 | /* |
2237 | * optimize away the read when we have an oplock, and we're not | |
2238 | * expecting to use any of the data we'd be reading in. That | |
2239 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2240 | * and the write will cover all of the existing data. | |
2241 | */ | |
2242 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2243 | i_size = i_size_read(mapping->host); | |
2244 | if (page_start >= i_size || | |
2245 | (offset == 0 && (pos + len) >= i_size)) { | |
2246 | zero_user_segments(page, 0, offset, | |
2247 | offset + len, | |
2248 | PAGE_CACHE_SIZE); | |
2249 | /* | |
2250 | * PageChecked means that the parts of the page | |
2251 | * to which we're not writing are considered up | |
2252 | * to date. Once the data is copied to the | |
2253 | * page, it can be set uptodate. | |
2254 | */ | |
2255 | SetPageChecked(page); | |
2256 | goto out; | |
2257 | } | |
2258 | } | |
d9414774 | 2259 | |
a98ee8c1 JL |
2260 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2261 | /* | |
2262 | * might as well read a page, it is fast enough. If we get | |
2263 | * an error, we don't need to return it. cifs_write_end will | |
2264 | * do a sync write instead since PG_uptodate isn't set. | |
2265 | */ | |
2266 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2267 | } else { |
2268 | /* we could try using another file handle if there is one - | |
2269 | but how would we lock it to prevent close of that handle | |
2270 | racing with this read? In any case | |
d9414774 | 2271 | this will be written out by write_end so is fine */ |
1da177e4 | 2272 | } |
a98ee8c1 JL |
2273 | out: |
2274 | *pagep = page; | |
2275 | return rc; | |
1da177e4 LT |
2276 | } |
2277 | ||
3bc303c2 JL |
2278 | static void |
2279 | cifs_oplock_break(struct slow_work *work) | |
2280 | { | |
2281 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2282 | oplock_break); | |
2283 | struct inode *inode = cfile->pInode; | |
2284 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2285 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2286 | int rc, waitrc = 0; | |
2287 | ||
2288 | if (inode && S_ISREG(inode->i_mode)) { | |
2289 | #ifdef CONFIG_CIFS_EXPERIMENTAL | |
2290 | if (cinode->clientCanCacheAll == 0) | |
8737c930 | 2291 | break_lease(inode, O_RDONLY); |
3bc303c2 | 2292 | else if (cinode->clientCanCacheRead == 0) |
8737c930 | 2293 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2294 | #endif |
2295 | rc = filemap_fdatawrite(inode->i_mapping); | |
2296 | if (cinode->clientCanCacheRead == 0) { | |
2297 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2298 | invalidate_remote_inode(inode); | |
2299 | } | |
2300 | if (!rc) | |
2301 | rc = waitrc; | |
2302 | if (rc) | |
2303 | cinode->write_behind_rc = rc; | |
2304 | cFYI(1, ("Oplock flush inode %p rc %d", inode, rc)); | |
2305 | } | |
2306 | ||
2307 | /* | |
2308 | * releasing stale oplock after recent reconnect of smb session using | |
2309 | * a now incorrect file handle is not a data integrity issue but do | |
2310 | * not bother sending an oplock release if session to server still is | |
2311 | * disconnected since oplock already released by the server | |
2312 | */ | |
2313 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2314 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2315 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
2316 | cFYI(1, ("Oplock release rc = %d", rc)); | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | static int | |
2321 | cifs_oplock_break_get(struct slow_work *work) | |
2322 | { | |
2323 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2324 | oplock_break); | |
2325 | mntget(cfile->mnt); | |
2326 | cifsFileInfo_get(cfile); | |
2327 | return 0; | |
2328 | } | |
2329 | ||
2330 | static void | |
2331 | cifs_oplock_break_put(struct slow_work *work) | |
2332 | { | |
2333 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2334 | oplock_break); | |
2335 | mntput(cfile->mnt); | |
2336 | cifsFileInfo_put(cfile); | |
2337 | } | |
2338 | ||
2339 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2340 | .get_ref = cifs_oplock_break_get, | |
2341 | .put_ref = cifs_oplock_break_put, | |
2342 | .execute = cifs_oplock_break, | |
2343 | }; | |
2344 | ||
f5e54d6e | 2345 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2346 | .readpage = cifs_readpage, |
2347 | .readpages = cifs_readpages, | |
2348 | .writepage = cifs_writepage, | |
37c0eb46 | 2349 | .writepages = cifs_writepages, |
d9414774 NP |
2350 | .write_begin = cifs_write_begin, |
2351 | .write_end = cifs_write_end, | |
1da177e4 LT |
2352 | .set_page_dirty = __set_page_dirty_nobuffers, |
2353 | /* .sync_page = cifs_sync_page, */ | |
2354 | /* .direct_IO = */ | |
2355 | }; | |
273d81d6 DK |
2356 | |
2357 | /* | |
2358 | * cifs_readpages requires the server to support a buffer large enough to | |
2359 | * contain the header plus one complete page of data. Otherwise, we need | |
2360 | * to leave cifs_readpages out of the address space operations. | |
2361 | */ | |
f5e54d6e | 2362 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2363 | .readpage = cifs_readpage, |
2364 | .writepage = cifs_writepage, | |
2365 | .writepages = cifs_writepages, | |
d9414774 NP |
2366 | .write_begin = cifs_write_begin, |
2367 | .write_end = cifs_write_end, | |
273d81d6 DK |
2368 | .set_page_dirty = __set_page_dirty_nobuffers, |
2369 | /* .sync_page = cifs_sync_page, */ | |
2370 | /* .direct_IO = */ | |
2371 | }; |