Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
608712fe | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 64 | { |
608712fe | 65 | u32 posix_flags = 0; |
e10f7b55 | 66 | |
7fc8f4e9 | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 68 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
70 | posix_flags = SMB_O_WRONLY; |
71 | else if ((flags & O_ACCMODE) == O_RDWR) | |
72 | posix_flags = SMB_O_RDWR; | |
73 | ||
74 | if (flags & O_CREAT) | |
75 | posix_flags |= SMB_O_CREAT; | |
76 | if (flags & O_EXCL) | |
77 | posix_flags |= SMB_O_EXCL; | |
78 | if (flags & O_TRUNC) | |
79 | posix_flags |= SMB_O_TRUNC; | |
80 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 81 | if (flags & O_DSYNC) |
608712fe | 82 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 83 | if (flags & O_DIRECTORY) |
608712fe | 84 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 85 | if (flags & O_NOFOLLOW) |
608712fe | 86 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 87 | if (flags & O_DIRECT) |
608712fe | 88 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
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 | ||
608712fe JL |
107 | int cifs_posix_open(char *full_path, struct inode **pinode, |
108 | struct super_block *sb, int mode, unsigned int f_flags, | |
109 | __u32 *poplock, __u16 *pnetfid, int xid) | |
110 | { | |
111 | int rc; | |
112 | FILE_UNIX_BASIC_INFO *presp_data; | |
113 | __u32 posix_flags = 0; | |
114 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
115 | struct cifs_fattr fattr; | |
116 | struct tcon_link *tlink; | |
117 | struct cifsTconInfo *tcon; | |
118 | ||
119 | cFYI(1, "posix open %s", full_path); | |
120 | ||
121 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
122 | if (presp_data == NULL) | |
123 | return -ENOMEM; | |
124 | ||
125 | tlink = cifs_sb_tlink(cifs_sb); | |
126 | if (IS_ERR(tlink)) { | |
127 | rc = PTR_ERR(tlink); | |
128 | goto posix_open_ret; | |
129 | } | |
130 | ||
131 | tcon = tlink_tcon(tlink); | |
132 | mode &= ~current_umask(); | |
133 | ||
134 | posix_flags = cifs_posix_convert_flags(f_flags); | |
135 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
136 | poplock, full_path, cifs_sb->local_nls, | |
137 | cifs_sb->mnt_cifs_flags & | |
138 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
139 | cifs_put_tlink(tlink); | |
140 | ||
141 | if (rc) | |
142 | goto posix_open_ret; | |
143 | ||
144 | if (presp_data->Type == cpu_to_le32(-1)) | |
145 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
146 | ||
147 | if (!pinode) | |
148 | goto posix_open_ret; /* caller does not need info */ | |
149 | ||
150 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
151 | ||
152 | /* get new inode and set it up */ | |
153 | if (*pinode == NULL) { | |
154 | cifs_fill_uniqueid(sb, &fattr); | |
155 | *pinode = cifs_iget(sb, &fattr); | |
156 | if (!*pinode) { | |
157 | rc = -ENOMEM; | |
158 | goto posix_open_ret; | |
159 | } | |
160 | } else { | |
161 | cifs_fattr_to_inode(*pinode, &fattr); | |
162 | } | |
163 | ||
164 | posix_open_ret: | |
165 | kfree(presp_data); | |
166 | return rc; | |
167 | } | |
168 | ||
eeb910a6 PS |
169 | static int |
170 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
171 | struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock, | |
172 | __u16 *pnetfid, int xid) | |
173 | { | |
174 | int rc; | |
175 | int desiredAccess; | |
176 | int disposition; | |
177 | FILE_ALL_INFO *buf; | |
178 | ||
179 | desiredAccess = cifs_convert_flags(f_flags); | |
180 | ||
181 | /********************************************************************* | |
182 | * open flag mapping table: | |
183 | * | |
184 | * POSIX Flag CIFS Disposition | |
185 | * ---------- ---------------- | |
186 | * O_CREAT FILE_OPEN_IF | |
187 | * O_CREAT | O_EXCL FILE_CREATE | |
188 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
189 | * O_TRUNC FILE_OVERWRITE | |
190 | * none of the above FILE_OPEN | |
191 | * | |
192 | * Note that there is not a direct match between disposition | |
193 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
194 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
195 | * file rather than creating a new file as FILE_SUPERSEDE does | |
196 | * (which uses the attributes / metadata passed in on open call) | |
197 | *? | |
198 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
199 | *? and the read write flags match reasonably. O_LARGEFILE | |
200 | *? is irrelevant because largefile support is always used | |
201 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
202 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
203 | *********************************************************************/ | |
204 | ||
205 | disposition = cifs_get_disposition(f_flags); | |
206 | ||
207 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
208 | ||
209 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
210 | if (!buf) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (tcon->ses->capabilities & CAP_NT_SMBS) | |
214 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
215 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
216 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
217 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
218 | else | |
219 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
220 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
223 | ||
224 | if (rc) | |
225 | goto out; | |
226 | ||
227 | if (tcon->unix_ext) | |
228 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
229 | xid); | |
230 | else | |
231 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
232 | xid, pnetfid); | |
233 | ||
234 | out: | |
235 | kfree(buf); | |
236 | return rc; | |
237 | } | |
238 | ||
15ecb436 JL |
239 | struct cifsFileInfo * |
240 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
241 | struct tcon_link *tlink, __u32 oplock) | |
242 | { | |
243 | struct dentry *dentry = file->f_path.dentry; | |
244 | struct inode *inode = dentry->d_inode; | |
245 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
246 | struct cifsFileInfo *pCifsFile; | |
247 | ||
248 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
249 | if (pCifsFile == NULL) | |
250 | return pCifsFile; | |
251 | ||
5f6dbc9e | 252 | pCifsFile->count = 1; |
15ecb436 JL |
253 | pCifsFile->netfid = fileHandle; |
254 | pCifsFile->pid = current->tgid; | |
255 | pCifsFile->uid = current_fsuid(); | |
256 | pCifsFile->dentry = dget(dentry); | |
257 | pCifsFile->f_flags = file->f_flags; | |
258 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
259 | pCifsFile->tlink = cifs_get_tlink(tlink); |
260 | mutex_init(&pCifsFile->fh_mutex); | |
261 | mutex_init(&pCifsFile->lock_mutex); | |
262 | INIT_LIST_HEAD(&pCifsFile->llist); | |
15ecb436 JL |
263 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
264 | ||
4477288a | 265 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
266 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
267 | /* if readable file instance put first in list*/ | |
268 | if (file->f_mode & FMODE_READ) | |
269 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
270 | else | |
271 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 272 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 273 | |
c6723628 | 274 | cifs_set_oplock_level(pCifsInode, oplock); |
15ecb436 JL |
275 | |
276 | file->private_data = pCifsFile; | |
277 | return pCifsFile; | |
278 | } | |
279 | ||
cdff08e7 SF |
280 | /* |
281 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
282 | * the filehandle out on the server. Must be called without holding |
283 | * cifs_file_list_lock. | |
cdff08e7 | 284 | */ |
b33879aa JL |
285 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
286 | { | |
e66673e3 | 287 | struct inode *inode = cifs_file->dentry->d_inode; |
cdff08e7 | 288 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 289 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
cdff08e7 SF |
290 | struct cifsLockInfo *li, *tmp; |
291 | ||
292 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 293 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
294 | spin_unlock(&cifs_file_list_lock); |
295 | return; | |
296 | } | |
297 | ||
298 | /* remove it from the lists */ | |
299 | list_del(&cifs_file->flist); | |
300 | list_del(&cifs_file->tlist); | |
301 | ||
302 | if (list_empty(&cifsi->openFileList)) { | |
303 | cFYI(1, "closing last open instance for inode %p", | |
304 | cifs_file->dentry->d_inode); | |
c6723628 | 305 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
306 | } |
307 | spin_unlock(&cifs_file_list_lock); | |
308 | ||
309 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { | |
310 | int xid, rc; | |
311 | ||
312 | xid = GetXid(); | |
313 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
314 | FreeXid(xid); | |
315 | } | |
316 | ||
317 | /* Delete any outstanding lock records. We'll lose them when the file | |
318 | * is closed anyway. | |
319 | */ | |
320 | mutex_lock(&cifs_file->lock_mutex); | |
321 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { | |
322 | list_del(&li->llist); | |
323 | kfree(li); | |
b33879aa | 324 | } |
cdff08e7 SF |
325 | mutex_unlock(&cifs_file->lock_mutex); |
326 | ||
327 | cifs_put_tlink(cifs_file->tlink); | |
328 | dput(cifs_file->dentry); | |
329 | kfree(cifs_file); | |
b33879aa JL |
330 | } |
331 | ||
1da177e4 LT |
332 | int cifs_open(struct inode *inode, struct file *file) |
333 | { | |
334 | int rc = -EACCES; | |
590a3fe0 JL |
335 | int xid; |
336 | __u32 oplock; | |
1da177e4 | 337 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 338 | struct cifsTconInfo *tcon; |
7ffec372 | 339 | struct tcon_link *tlink; |
6ca9f3ba | 340 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 341 | struct cifsInodeInfo *pCifsInode; |
1da177e4 | 342 | char *full_path = NULL; |
7e12eddb | 343 | bool posix_open_ok = false; |
1da177e4 | 344 | __u16 netfid; |
1da177e4 LT |
345 | |
346 | xid = GetXid(); | |
347 | ||
348 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
349 | tlink = cifs_sb_tlink(cifs_sb); |
350 | if (IS_ERR(tlink)) { | |
351 | FreeXid(xid); | |
352 | return PTR_ERR(tlink); | |
353 | } | |
354 | tcon = tlink_tcon(tlink); | |
1da177e4 | 355 | |
a6ce4932 | 356 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 357 | |
e6a00296 | 358 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 359 | if (full_path == NULL) { |
0f3bc09e | 360 | rc = -ENOMEM; |
232341ba | 361 | goto out; |
1da177e4 LT |
362 | } |
363 | ||
b6b38f70 JP |
364 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
365 | inode, file->f_flags, full_path); | |
276a74a4 SF |
366 | |
367 | if (oplockEnabled) | |
368 | oplock = REQ_OPLOCK; | |
369 | else | |
370 | oplock = 0; | |
371 | ||
64cc2c63 SF |
372 | if (!tcon->broken_posix_open && tcon->unix_ext && |
373 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
374 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
375 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 376 | /* can not refresh inode info since size could be stale */ |
2422f676 | 377 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 378 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 379 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 380 | if (rc == 0) { |
b6b38f70 | 381 | cFYI(1, "posix open succeeded"); |
7e12eddb | 382 | posix_open_ok = true; |
64cc2c63 SF |
383 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
384 | if (tcon->ses->serverNOS) | |
b6b38f70 | 385 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
386 | " unexpected error on SMB posix open" |
387 | ", disabling posix open support." | |
388 | " Check if server update available.", | |
389 | tcon->ses->serverName, | |
b6b38f70 | 390 | tcon->ses->serverNOS); |
64cc2c63 | 391 | tcon->broken_posix_open = true; |
276a74a4 SF |
392 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
393 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
394 | goto out; | |
64cc2c63 SF |
395 | /* else fallthrough to retry open the old way on network i/o |
396 | or DFS errors */ | |
276a74a4 SF |
397 | } |
398 | ||
7e12eddb PS |
399 | if (!posix_open_ok) { |
400 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
401 | file->f_flags, &oplock, &netfid, xid); | |
402 | if (rc) | |
403 | goto out; | |
404 | } | |
47c78b7f | 405 | |
abfe1eed | 406 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 407 | if (pCifsFile == NULL) { |
7e12eddb | 408 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
409 | rc = -ENOMEM; |
410 | goto out; | |
411 | } | |
1da177e4 | 412 | |
9451a9a5 SJ |
413 | cifs_fscache_set_inode_cookie(inode, file); |
414 | ||
7e12eddb | 415 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
416 | /* time to set mode which we can not set earlier due to |
417 | problems creating new read-only files */ | |
7e12eddb PS |
418 | struct cifs_unix_set_info_args args = { |
419 | .mode = inode->i_mode, | |
420 | .uid = NO_CHANGE_64, | |
421 | .gid = NO_CHANGE_64, | |
422 | .ctime = NO_CHANGE_64, | |
423 | .atime = NO_CHANGE_64, | |
424 | .mtime = NO_CHANGE_64, | |
425 | .device = 0, | |
426 | }; | |
427 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, | |
428 | cifs_sb->local_nls, | |
429 | cifs_sb->mnt_cifs_flags & | |
430 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
431 | } |
432 | ||
433 | out: | |
1da177e4 LT |
434 | kfree(full_path); |
435 | FreeXid(xid); | |
7ffec372 | 436 | cifs_put_tlink(tlink); |
1da177e4 LT |
437 | return rc; |
438 | } | |
439 | ||
0418726b | 440 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
441 | /* to server was lost */ |
442 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
443 | { | |
444 | int rc = 0; | |
445 | ||
446 | /* BB list all locks open on this file and relock */ | |
447 | ||
448 | return rc; | |
449 | } | |
450 | ||
15886177 | 451 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
452 | { |
453 | int rc = -EACCES; | |
590a3fe0 JL |
454 | int xid; |
455 | __u32 oplock; | |
1da177e4 | 456 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 457 | struct cifsTconInfo *tcon; |
1da177e4 | 458 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 459 | struct inode *inode; |
1da177e4 LT |
460 | char *full_path = NULL; |
461 | int desiredAccess; | |
462 | int disposition = FILE_OPEN; | |
463 | __u16 netfid; | |
464 | ||
1da177e4 | 465 | xid = GetXid(); |
f0a71eb8 | 466 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 467 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 468 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 469 | rc = 0; |
1da177e4 | 470 | FreeXid(xid); |
0f3bc09e | 471 | return rc; |
1da177e4 LT |
472 | } |
473 | ||
15886177 | 474 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 475 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 476 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 477 | |
1da177e4 LT |
478 | /* can not grab rename sem here because various ops, including |
479 | those that already have the rename sem can end up causing writepage | |
480 | to get called and if the server was down that means we end up here, | |
481 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 482 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 483 | if (full_path == NULL) { |
3a9f462f | 484 | rc = -ENOMEM; |
f0a71eb8 | 485 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 486 | FreeXid(xid); |
3a9f462f | 487 | return rc; |
1da177e4 LT |
488 | } |
489 | ||
b6b38f70 | 490 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 491 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
492 | |
493 | if (oplockEnabled) | |
494 | oplock = REQ_OPLOCK; | |
495 | else | |
4b18f2a9 | 496 | oplock = 0; |
1da177e4 | 497 | |
7fc8f4e9 SF |
498 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
499 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
500 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
501 | |
502 | /* | |
503 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
504 | * original open. Must mask them off for a reopen. | |
505 | */ | |
15886177 JL |
506 | unsigned int oflags = pCifsFile->f_flags & |
507 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 508 | |
2422f676 | 509 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
510 | cifs_sb->mnt_file_mode /* ignored */, |
511 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 512 | if (rc == 0) { |
b6b38f70 | 513 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
514 | goto reopen_success; |
515 | } | |
516 | /* fallthrough to retry open the old way on errors, especially | |
517 | in the reconnect path it is important to retry hard */ | |
518 | } | |
519 | ||
15886177 | 520 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 521 | |
1da177e4 | 522 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
523 | by SMBOpen and then calling get_inode_info with returned buf |
524 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
525 | and server version of file size can be stale. If we knew for sure |
526 | that inode was not dirty locally we could do this */ | |
527 | ||
7fc8f4e9 | 528 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 529 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 530 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 531 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 532 | if (rc) { |
f0a71eb8 | 533 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
534 | cFYI(1, "cifs_open returned 0x%x", rc); |
535 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
536 | goto reopen_error_exit; |
537 | } | |
538 | ||
7fc8f4e9 | 539 | reopen_success: |
15886177 JL |
540 | pCifsFile->netfid = netfid; |
541 | pCifsFile->invalidHandle = false; | |
542 | mutex_unlock(&pCifsFile->fh_mutex); | |
543 | pCifsInode = CIFS_I(inode); | |
544 | ||
545 | if (can_flush) { | |
546 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 547 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 548 | |
15886177 JL |
549 | if (tcon->unix_ext) |
550 | rc = cifs_get_inode_info_unix(&inode, | |
551 | full_path, inode->i_sb, xid); | |
552 | else | |
553 | rc = cifs_get_inode_info(&inode, | |
554 | full_path, NULL, inode->i_sb, | |
555 | xid, NULL); | |
556 | } /* else we are writing out data to server already | |
557 | and could deadlock if we tried to flush data, and | |
558 | since we do not know if we have data that would | |
559 | invalidate the current end of file on the server | |
560 | we can not go to the server to get the new inod | |
561 | info */ | |
e66673e3 | 562 | |
c6723628 | 563 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 564 | |
15886177 JL |
565 | cifs_relock_file(pCifsFile); |
566 | ||
567 | reopen_error_exit: | |
1da177e4 LT |
568 | kfree(full_path); |
569 | FreeXid(xid); | |
570 | return rc; | |
571 | } | |
572 | ||
573 | int cifs_close(struct inode *inode, struct file *file) | |
574 | { | |
cdff08e7 SF |
575 | cifsFileInfo_put(file->private_data); |
576 | file->private_data = NULL; | |
7ee1af76 | 577 | |
cdff08e7 SF |
578 | /* return code from the ->release op is always ignored */ |
579 | return 0; | |
1da177e4 LT |
580 | } |
581 | ||
582 | int cifs_closedir(struct inode *inode, struct file *file) | |
583 | { | |
584 | int rc = 0; | |
585 | int xid; | |
c21dfb69 | 586 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
587 | char *ptmp; |
588 | ||
b6b38f70 | 589 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
590 | |
591 | xid = GetXid(); | |
592 | ||
593 | if (pCFileStruct) { | |
13cfb733 | 594 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 595 | |
b6b38f70 | 596 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 597 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
598 | if (!pCFileStruct->srch_inf.endOfSearch && |
599 | !pCFileStruct->invalidHandle) { | |
600 | pCFileStruct->invalidHandle = true; | |
4477288a | 601 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 602 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
603 | cFYI(1, "Closing uncompleted readdir with rc %d", |
604 | rc); | |
1da177e4 LT |
605 | /* not much we can do if it fails anyway, ignore rc */ |
606 | rc = 0; | |
ddb4cbfc | 607 | } else |
4477288a | 608 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
609 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
610 | if (ptmp) { | |
b6b38f70 | 611 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 612 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 613 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
614 | cifs_small_buf_release(ptmp); |
615 | else | |
616 | cifs_buf_release(ptmp); | |
1da177e4 | 617 | } |
13cfb733 | 618 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
619 | kfree(file->private_data); |
620 | file->private_data = NULL; | |
621 | } | |
622 | /* BB can we lock the filestruct while this is going on? */ | |
623 | FreeXid(xid); | |
624 | return rc; | |
625 | } | |
626 | ||
7ee1af76 JA |
627 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
628 | __u64 offset, __u8 lockType) | |
629 | { | |
fb8c4b14 SF |
630 | struct cifsLockInfo *li = |
631 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
632 | if (li == NULL) |
633 | return -ENOMEM; | |
634 | li->offset = offset; | |
635 | li->length = len; | |
636 | li->type = lockType; | |
796e5661 | 637 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 638 | list_add(&li->llist, &fid->llist); |
796e5661 | 639 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
640 | return 0; |
641 | } | |
642 | ||
1da177e4 LT |
643 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
644 | { | |
645 | int rc, xid; | |
1da177e4 LT |
646 | __u32 numLock = 0; |
647 | __u32 numUnlock = 0; | |
648 | __u64 length; | |
4b18f2a9 | 649 | bool wait_flag = false; |
1da177e4 | 650 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 651 | struct cifsTconInfo *tcon; |
08547b03 SF |
652 | __u16 netfid; |
653 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 654 | bool posix_locking = 0; |
1da177e4 LT |
655 | |
656 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
657 | rc = -EACCES; | |
658 | xid = GetXid(); | |
659 | ||
b6b38f70 | 660 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 661 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 662 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 663 | pfLock->fl_end); |
1da177e4 LT |
664 | |
665 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 666 | cFYI(1, "Posix"); |
1da177e4 | 667 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 668 | cFYI(1, "Flock"); |
1da177e4 | 669 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 670 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 671 | wait_flag = true; |
1da177e4 LT |
672 | } |
673 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
674 | cFYI(1, "Process suspended by mandatory locking - " |
675 | "not implemented yet"); | |
1da177e4 | 676 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 677 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 678 | if (pfLock->fl_flags & |
1da177e4 | 679 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 680 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
681 | |
682 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 683 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
684 | numLock = 1; |
685 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 686 | cFYI(1, "F_UNLCK"); |
1da177e4 | 687 | numUnlock = 1; |
d47d7c1a SF |
688 | /* Check if unlock includes more than |
689 | one lock range */ | |
1da177e4 | 690 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 691 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
692 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
693 | numLock = 1; | |
694 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 695 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
696 | numLock = 1; |
697 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 698 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
699 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
700 | numLock = 1; | |
701 | } else | |
b6b38f70 | 702 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 703 | |
e6a00296 | 704 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 705 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
08547b03 SF |
706 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
707 | ||
13a6e42a SF |
708 | if ((tcon->ses->capabilities & CAP_UNIX) && |
709 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 710 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 711 | posix_locking = 1; |
08547b03 SF |
712 | /* BB add code here to normalize offset and length to |
713 | account for negative length which we can not accept over the | |
714 | wire */ | |
1da177e4 | 715 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 716 | if (posix_locking) { |
08547b03 | 717 | int posix_lock_type; |
fb8c4b14 | 718 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
719 | posix_lock_type = CIFS_RDLCK; |
720 | else | |
721 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 722 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 723 | length, pfLock, |
08547b03 SF |
724 | posix_lock_type, wait_flag); |
725 | FreeXid(xid); | |
726 | return rc; | |
727 | } | |
728 | ||
729 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 730 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 731 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 732 | if (rc == 0) { |
13a6e42a | 733 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
734 | pfLock->fl_start, 1 /* numUnlock */ , |
735 | 0 /* numLock */ , lockType, | |
736 | 0 /* wait flag */ ); | |
737 | pfLock->fl_type = F_UNLCK; | |
738 | if (rc != 0) | |
b6b38f70 JP |
739 | cERROR(1, "Error unlocking previously locked " |
740 | "range %d during test of lock", rc); | |
1da177e4 LT |
741 | rc = 0; |
742 | ||
743 | } else { | |
744 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
745 | rc = 0; |
746 | ||
747 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
748 | pfLock->fl_type = F_WRLCK; | |
749 | } else { | |
750 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
751 | pfLock->fl_start, 0, 1, | |
752 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
753 | 0 /* wait flag */); | |
754 | if (rc == 0) { | |
755 | rc = CIFSSMBLock(xid, tcon, netfid, | |
756 | length, pfLock->fl_start, 1, 0, | |
757 | lockType | | |
758 | LOCKING_ANDX_SHARED_LOCK, | |
759 | 0 /* wait flag */); | |
760 | pfLock->fl_type = F_RDLCK; | |
761 | if (rc != 0) | |
f19159dc | 762 | cERROR(1, "Error unlocking " |
f05337c6 | 763 | "previously locked range %d " |
f19159dc | 764 | "during test of lock", rc); |
f05337c6 PS |
765 | rc = 0; |
766 | } else { | |
767 | pfLock->fl_type = F_WRLCK; | |
768 | rc = 0; | |
769 | } | |
770 | } | |
1da177e4 LT |
771 | } |
772 | ||
773 | FreeXid(xid); | |
774 | return rc; | |
775 | } | |
7ee1af76 JA |
776 | |
777 | if (!numLock && !numUnlock) { | |
778 | /* if no lock or unlock then nothing | |
779 | to do since we do not know what it is */ | |
780 | FreeXid(xid); | |
781 | return -EOPNOTSUPP; | |
782 | } | |
783 | ||
784 | if (posix_locking) { | |
08547b03 | 785 | int posix_lock_type; |
fb8c4b14 | 786 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
787 | posix_lock_type = CIFS_RDLCK; |
788 | else | |
789 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 790 | |
fb8c4b14 | 791 | if (numUnlock == 1) |
beb84dc8 | 792 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 793 | |
13a6e42a | 794 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 795 | length, pfLock, |
08547b03 | 796 | posix_lock_type, wait_flag); |
7ee1af76 | 797 | } else { |
c21dfb69 | 798 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
799 | |
800 | if (numLock) { | |
13a6e42a | 801 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 802 | pfLock->fl_start, |
7ee1af76 JA |
803 | 0, numLock, lockType, wait_flag); |
804 | ||
805 | if (rc == 0) { | |
806 | /* For Windows locks we must store them. */ | |
807 | rc = store_file_lock(fid, length, | |
808 | pfLock->fl_start, lockType); | |
809 | } | |
810 | } else if (numUnlock) { | |
811 | /* For each stored lock that this unlock overlaps | |
812 | completely, unlock it. */ | |
813 | int stored_rc = 0; | |
814 | struct cifsLockInfo *li, *tmp; | |
815 | ||
6b70c955 | 816 | rc = 0; |
796e5661 | 817 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
818 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
819 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 820 | (pfLock->fl_start + length) >= |
39db810c | 821 | (li->offset + li->length)) { |
13a6e42a | 822 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 823 | netfid, |
7ee1af76 | 824 | li->length, li->offset, |
4b18f2a9 | 825 | 1, 0, li->type, false); |
7ee1af76 JA |
826 | if (stored_rc) |
827 | rc = stored_rc; | |
2c964d1f PS |
828 | else { |
829 | list_del(&li->llist); | |
830 | kfree(li); | |
831 | } | |
7ee1af76 JA |
832 | } |
833 | } | |
796e5661 | 834 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
835 | } |
836 | } | |
837 | ||
d634cc15 | 838 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
839 | posix_lock_file_wait(file, pfLock); |
840 | FreeXid(xid); | |
841 | return rc; | |
842 | } | |
843 | ||
fbec9ab9 JL |
844 | /* |
845 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
846 | * these calls can be very long. | |
847 | * | |
848 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
849 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
850 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
851 | * welcome if someone wants to suggest one. | |
852 | * | |
853 | * We may be able to do a better job with this if there were some way to | |
854 | * declare that a file should be sparse. | |
855 | */ | |
856 | static int | |
857 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
858 | { | |
859 | if (offset <= cifsi->server_eof) | |
860 | return CIFS_STD_OP; | |
861 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
862 | return CIFS_VLONG_OP; | |
863 | else | |
864 | return CIFS_LONG_OP; | |
865 | } | |
866 | ||
867 | /* update the file size (if needed) after a write */ | |
868 | static void | |
869 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
870 | unsigned int bytes_written) | |
871 | { | |
872 | loff_t end_of_write = offset + bytes_written; | |
873 | ||
874 | if (end_of_write > cifsi->server_eof) | |
875 | cifsi->server_eof = end_of_write; | |
876 | } | |
877 | ||
1da177e4 LT |
878 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
879 | size_t write_size, loff_t *poffset) | |
880 | { | |
50ae28f0 | 881 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
882 | int rc = 0; |
883 | unsigned int bytes_written = 0; | |
884 | unsigned int total_written; | |
885 | struct cifs_sb_info *cifs_sb; | |
886 | struct cifsTconInfo *pTcon; | |
887 | int xid, long_op; | |
888 | struct cifsFileInfo *open_file; | |
50ae28f0 | 889 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
1da177e4 | 890 | |
e6a00296 | 891 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 892 | |
b6b38f70 JP |
893 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
894 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
895 | |
896 | if (file->private_data == NULL) | |
897 | return -EBADF; | |
ba00ba64 | 898 | |
c21dfb69 | 899 | open_file = file->private_data; |
13cfb733 | 900 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 901 | |
838726c4 JL |
902 | rc = generic_write_checks(file, poffset, &write_size, 0); |
903 | if (rc) | |
904 | return rc; | |
905 | ||
1da177e4 | 906 | xid = GetXid(); |
1da177e4 | 907 | |
fbec9ab9 | 908 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
909 | for (total_written = 0; write_size > total_written; |
910 | total_written += bytes_written) { | |
911 | rc = -EAGAIN; | |
912 | while (rc == -EAGAIN) { | |
913 | if (file->private_data == NULL) { | |
914 | /* file has been closed on us */ | |
915 | FreeXid(xid); | |
916 | /* if we have gotten here we have written some data | |
917 | and blocked, and the file has been freed on us while | |
918 | we blocked so return what we managed to write */ | |
919 | return total_written; | |
fb8c4b14 | 920 | } |
1da177e4 | 921 | if (open_file->invalidHandle) { |
1da177e4 LT |
922 | /* we could deadlock if we called |
923 | filemap_fdatawait from here so tell | |
924 | reopen_file not to flush data to server | |
925 | now */ | |
15886177 | 926 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
927 | if (rc != 0) |
928 | break; | |
929 | } | |
930 | ||
931 | rc = CIFSSMBWrite(xid, pTcon, | |
932 | open_file->netfid, | |
933 | min_t(const int, cifs_sb->wsize, | |
934 | write_size - total_written), | |
935 | *poffset, &bytes_written, | |
936 | NULL, write_data + total_written, long_op); | |
937 | } | |
938 | if (rc || (bytes_written == 0)) { | |
939 | if (total_written) | |
940 | break; | |
941 | else { | |
942 | FreeXid(xid); | |
943 | return rc; | |
944 | } | |
fbec9ab9 JL |
945 | } else { |
946 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 947 | *poffset += bytes_written; |
fbec9ab9 | 948 | } |
133672ef | 949 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
950 | 15 seconds is plenty */ |
951 | } | |
952 | ||
a4544347 | 953 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 954 | |
fb8c4b14 | 955 | /* Do not update local mtime - server will set its actual value on write |
50ae28f0 JS |
956 | * inode->i_ctime = inode->i_mtime = |
957 | * current_fs_time(inode->i_sb);*/ | |
958 | if (total_written > 0) { | |
959 | spin_lock(&inode->i_lock); | |
960 | if (*poffset > inode->i_size) | |
961 | i_size_write(inode, *poffset); | |
962 | spin_unlock(&inode->i_lock); | |
1da177e4 | 963 | } |
50ae28f0 JS |
964 | mark_inode_dirty_sync(inode); |
965 | ||
1da177e4 LT |
966 | FreeXid(xid); |
967 | return total_written; | |
968 | } | |
969 | ||
7da4b49a JL |
970 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
971 | const char *write_data, size_t write_size, | |
972 | loff_t *poffset) | |
1da177e4 LT |
973 | { |
974 | int rc = 0; | |
975 | unsigned int bytes_written = 0; | |
976 | unsigned int total_written; | |
977 | struct cifs_sb_info *cifs_sb; | |
978 | struct cifsTconInfo *pTcon; | |
979 | int xid, long_op; | |
7da4b49a JL |
980 | struct dentry *dentry = open_file->dentry; |
981 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 982 | |
7da4b49a | 983 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 984 | |
b6b38f70 | 985 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 986 | *poffset, dentry->d_name.name); |
1da177e4 | 987 | |
13cfb733 | 988 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 989 | |
1da177e4 | 990 | xid = GetXid(); |
1da177e4 | 991 | |
fbec9ab9 | 992 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
993 | for (total_written = 0; write_size > total_written; |
994 | total_written += bytes_written) { | |
995 | rc = -EAGAIN; | |
996 | while (rc == -EAGAIN) { | |
1da177e4 | 997 | if (open_file->invalidHandle) { |
1da177e4 LT |
998 | /* we could deadlock if we called |
999 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1000 | reopen_file not to flush data to |
1da177e4 | 1001 | server now */ |
15886177 | 1002 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1003 | if (rc != 0) |
1004 | break; | |
1005 | } | |
fb8c4b14 SF |
1006 | if (experimEnabled || (pTcon->ses->server && |
1007 | ((pTcon->ses->server->secMode & | |
08775834 | 1008 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1009 | == 0))) { |
3e84469d SF |
1010 | struct kvec iov[2]; |
1011 | unsigned int len; | |
1012 | ||
0ae0efad | 1013 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1014 | write_size - total_written); |
1015 | /* iov[0] is reserved for smb header */ | |
1016 | iov[1].iov_base = (char *)write_data + | |
1017 | total_written; | |
1018 | iov[1].iov_len = len; | |
d6e04ae6 | 1019 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1020 | open_file->netfid, len, |
d6e04ae6 | 1021 | *poffset, &bytes_written, |
3e84469d | 1022 | iov, 1, long_op); |
d6e04ae6 | 1023 | } else |
60808233 SF |
1024 | rc = CIFSSMBWrite(xid, pTcon, |
1025 | open_file->netfid, | |
1026 | min_t(const int, cifs_sb->wsize, | |
1027 | write_size - total_written), | |
1028 | *poffset, &bytes_written, | |
1029 | write_data + total_written, | |
1030 | NULL, long_op); | |
1da177e4 LT |
1031 | } |
1032 | if (rc || (bytes_written == 0)) { | |
1033 | if (total_written) | |
1034 | break; | |
1035 | else { | |
1036 | FreeXid(xid); | |
1037 | return rc; | |
1038 | } | |
fbec9ab9 JL |
1039 | } else { |
1040 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1041 | *poffset += bytes_written; |
fbec9ab9 | 1042 | } |
133672ef | 1043 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1044 | 15 seconds is plenty */ |
1045 | } | |
1046 | ||
a4544347 | 1047 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1048 | |
7da4b49a JL |
1049 | if (total_written > 0) { |
1050 | spin_lock(&dentry->d_inode->i_lock); | |
1051 | if (*poffset > dentry->d_inode->i_size) | |
1052 | i_size_write(dentry->d_inode, *poffset); | |
1053 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1054 | } |
7da4b49a | 1055 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1056 | FreeXid(xid); |
1057 | return total_written; | |
1058 | } | |
1059 | ||
6508d904 JL |
1060 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1061 | bool fsuid_only) | |
630f3f0c SF |
1062 | { |
1063 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1064 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1065 | ||
1066 | /* only filter by fsuid on multiuser mounts */ | |
1067 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1068 | fsuid_only = false; | |
630f3f0c | 1069 | |
4477288a | 1070 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1071 | /* we could simply get the first_list_entry since write-only entries |
1072 | are always at the end of the list but since the first entry might | |
1073 | have a close pending, we go through the whole list */ | |
1074 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1075 | if (fsuid_only && open_file->uid != current_fsuid()) |
1076 | continue; | |
2e396b83 | 1077 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1078 | if (!open_file->invalidHandle) { |
1079 | /* found a good file */ | |
1080 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1081 | cifsFileInfo_get(open_file); |
4477288a | 1082 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1083 | return open_file; |
1084 | } /* else might as well continue, and look for | |
1085 | another, or simply have the caller reopen it | |
1086 | again rather than trying to fix this handle */ | |
1087 | } else /* write only file */ | |
1088 | break; /* write only files are last so must be done */ | |
1089 | } | |
4477288a | 1090 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1091 | return NULL; |
1092 | } | |
630f3f0c | 1093 | |
6508d904 JL |
1094 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1095 | bool fsuid_only) | |
6148a742 SF |
1096 | { |
1097 | struct cifsFileInfo *open_file; | |
d3892294 | 1098 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1099 | bool any_available = false; |
dd99cd80 | 1100 | int rc; |
6148a742 | 1101 | |
60808233 SF |
1102 | /* Having a null inode here (because mapping->host was set to zero by |
1103 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1104 | it being zero) during stress testcases so we need to check for it */ | |
1105 | ||
fb8c4b14 | 1106 | if (cifs_inode == NULL) { |
b6b38f70 | 1107 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1108 | dump_stack(); |
1109 | return NULL; | |
1110 | } | |
1111 | ||
d3892294 JL |
1112 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1113 | ||
6508d904 JL |
1114 | /* only filter by fsuid on multiuser mounts */ |
1115 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1116 | fsuid_only = false; | |
1117 | ||
4477288a | 1118 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1119 | refind_writable: |
6148a742 | 1120 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1121 | if (!any_available && open_file->pid != current->tgid) |
1122 | continue; | |
1123 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1124 | continue; |
2e396b83 | 1125 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1126 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1127 | |
1128 | if (!open_file->invalidHandle) { | |
1129 | /* found a good writable file */ | |
4477288a | 1130 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1131 | return open_file; |
1132 | } | |
8840dee9 | 1133 | |
4477288a | 1134 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1135 | |
9b22b0b7 | 1136 | /* Had to unlock since following call can block */ |
15886177 | 1137 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1138 | if (!rc) |
1139 | return open_file; | |
9b22b0b7 | 1140 | |
cdff08e7 | 1141 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1142 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1143 | cifsFileInfo_put(open_file); |
8840dee9 | 1144 | |
cdff08e7 SF |
1145 | spin_lock(&cifs_file_list_lock); |
1146 | ||
9b22b0b7 SF |
1147 | /* else we simply continue to the next entry. Thus |
1148 | we do not loop on reopen errors. If we | |
1149 | can not reopen the file, for example if we | |
1150 | reconnected to a server with another client | |
1151 | racing to delete or lock the file we would not | |
1152 | make progress if we restarted before the beginning | |
1153 | of the loop here. */ | |
6148a742 SF |
1154 | } |
1155 | } | |
2846d386 JL |
1156 | /* couldn't find useable FH with same pid, try any available */ |
1157 | if (!any_available) { | |
1158 | any_available = true; | |
1159 | goto refind_writable; | |
1160 | } | |
4477288a | 1161 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1162 | return NULL; |
1163 | } | |
1164 | ||
1da177e4 LT |
1165 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1166 | { | |
1167 | struct address_space *mapping = page->mapping; | |
1168 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1169 | char *write_data; | |
1170 | int rc = -EFAULT; | |
1171 | int bytes_written = 0; | |
1172 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1173 | struct inode *inode; |
6148a742 | 1174 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1175 | |
1176 | if (!mapping || !mapping->host) | |
1177 | return -EFAULT; | |
1178 | ||
1179 | inode = page->mapping->host; | |
1180 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1181 | |
1182 | offset += (loff_t)from; | |
1183 | write_data = kmap(page); | |
1184 | write_data += from; | |
1185 | ||
1186 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1187 | kunmap(page); | |
1188 | return -EIO; | |
1189 | } | |
1190 | ||
1191 | /* racing with truncate? */ | |
1192 | if (offset > mapping->host->i_size) { | |
1193 | kunmap(page); | |
1194 | return 0; /* don't care */ | |
1195 | } | |
1196 | ||
1197 | /* check to make sure that we are not extending the file */ | |
1198 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1199 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1200 | |
6508d904 | 1201 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1202 | if (open_file) { |
7da4b49a JL |
1203 | bytes_written = cifs_write(open_file, write_data, |
1204 | to - from, &offset); | |
6ab409b5 | 1205 | cifsFileInfo_put(open_file); |
1da177e4 | 1206 | /* Does mm or vfs already set times? */ |
6148a742 | 1207 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1208 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1209 | rc = 0; |
bb5a9a04 SF |
1210 | else if (bytes_written < 0) |
1211 | rc = bytes_written; | |
6148a742 | 1212 | } else { |
b6b38f70 | 1213 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1214 | rc = -EIO; |
1215 | } | |
1216 | ||
1217 | kunmap(page); | |
1218 | return rc; | |
1219 | } | |
1220 | ||
1da177e4 | 1221 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1222 | struct writeback_control *wbc) |
1da177e4 | 1223 | { |
37c0eb46 SF |
1224 | unsigned int bytes_to_write; |
1225 | unsigned int bytes_written; | |
1226 | struct cifs_sb_info *cifs_sb; | |
1227 | int done = 0; | |
111ebb6e | 1228 | pgoff_t end; |
37c0eb46 | 1229 | pgoff_t index; |
fb8c4b14 SF |
1230 | int range_whole = 0; |
1231 | struct kvec *iov; | |
84d2f07e | 1232 | int len; |
37c0eb46 SF |
1233 | int n_iov = 0; |
1234 | pgoff_t next; | |
1235 | int nr_pages; | |
1236 | __u64 offset = 0; | |
23e7dd7d | 1237 | struct cifsFileInfo *open_file; |
ba00ba64 | 1238 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1239 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1240 | struct page *page; |
1241 | struct pagevec pvec; | |
1242 | int rc = 0; | |
1243 | int scanned = 0; | |
fbec9ab9 | 1244 | int xid, long_op; |
1da177e4 | 1245 | |
37c0eb46 | 1246 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1247 | |
37c0eb46 SF |
1248 | /* |
1249 | * If wsize is smaller that the page cache size, default to writing | |
1250 | * one page at a time via cifs_writepage | |
1251 | */ | |
1252 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1253 | return generic_writepages(mapping, wbc); | |
1254 | ||
9a0c8230 | 1255 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1256 | if (iov == NULL) |
9a0c8230 SF |
1257 | return generic_writepages(mapping, wbc); |
1258 | ||
37c0eb46 | 1259 | /* |
f3983c21 JL |
1260 | * if there's no open file, then this is likely to fail too, |
1261 | * but it'll at least handle the return. Maybe it should be | |
1262 | * a BUG() instead? | |
37c0eb46 | 1263 | */ |
6508d904 | 1264 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1265 | if (!open_file) { |
9a0c8230 | 1266 | kfree(iov); |
f3983c21 JL |
1267 | return generic_writepages(mapping, wbc); |
1268 | } | |
1269 | ||
13cfb733 | 1270 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1271 | if (!experimEnabled && tcon->ses->server->secMode & |
1272 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1273 | cifsFileInfo_put(open_file); | |
6b035904 | 1274 | kfree(iov); |
f3983c21 | 1275 | return generic_writepages(mapping, wbc); |
37c0eb46 | 1276 | } |
f3983c21 | 1277 | cifsFileInfo_put(open_file); |
37c0eb46 | 1278 | |
1da177e4 LT |
1279 | xid = GetXid(); |
1280 | ||
37c0eb46 | 1281 | pagevec_init(&pvec, 0); |
111ebb6e | 1282 | if (wbc->range_cyclic) { |
37c0eb46 | 1283 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1284 | end = -1; |
1285 | } else { | |
1286 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1287 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1288 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1289 | range_whole = 1; | |
37c0eb46 SF |
1290 | scanned = 1; |
1291 | } | |
1292 | retry: | |
1293 | while (!done && (index <= end) && | |
1294 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1295 | PAGECACHE_TAG_DIRTY, | |
1296 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1297 | int first; | |
1298 | unsigned int i; | |
1299 | ||
37c0eb46 SF |
1300 | first = -1; |
1301 | next = 0; | |
1302 | n_iov = 0; | |
1303 | bytes_to_write = 0; | |
1304 | ||
1305 | for (i = 0; i < nr_pages; i++) { | |
1306 | page = pvec.pages[i]; | |
1307 | /* | |
1308 | * At this point we hold neither mapping->tree_lock nor | |
1309 | * lock on the page itself: the page may be truncated or | |
1310 | * invalidated (changing page->mapping to NULL), or even | |
1311 | * swizzled back from swapper_space to tmpfs file | |
1312 | * mapping | |
1313 | */ | |
1314 | ||
1315 | if (first < 0) | |
1316 | lock_page(page); | |
529ae9aa | 1317 | else if (!trylock_page(page)) |
37c0eb46 SF |
1318 | break; |
1319 | ||
1320 | if (unlikely(page->mapping != mapping)) { | |
1321 | unlock_page(page); | |
1322 | break; | |
1323 | } | |
1324 | ||
111ebb6e | 1325 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1326 | done = 1; |
1327 | unlock_page(page); | |
1328 | break; | |
1329 | } | |
1330 | ||
1331 | if (next && (page->index != next)) { | |
1332 | /* Not next consecutive page */ | |
1333 | unlock_page(page); | |
1334 | break; | |
1335 | } | |
1336 | ||
1337 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1338 | wait_on_page_writeback(page); | |
1339 | ||
1340 | if (PageWriteback(page) || | |
cb876f45 | 1341 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1342 | unlock_page(page); |
1343 | break; | |
1344 | } | |
84d2f07e | 1345 | |
cb876f45 LT |
1346 | /* |
1347 | * This actually clears the dirty bit in the radix tree. | |
1348 | * See cifs_writepage() for more commentary. | |
1349 | */ | |
1350 | set_page_writeback(page); | |
1351 | ||
84d2f07e SF |
1352 | if (page_offset(page) >= mapping->host->i_size) { |
1353 | done = 1; | |
1354 | unlock_page(page); | |
cb876f45 | 1355 | end_page_writeback(page); |
84d2f07e SF |
1356 | break; |
1357 | } | |
1358 | ||
37c0eb46 SF |
1359 | /* |
1360 | * BB can we get rid of this? pages are held by pvec | |
1361 | */ | |
1362 | page_cache_get(page); | |
1363 | ||
84d2f07e SF |
1364 | len = min(mapping->host->i_size - page_offset(page), |
1365 | (loff_t)PAGE_CACHE_SIZE); | |
1366 | ||
37c0eb46 SF |
1367 | /* reserve iov[0] for the smb header */ |
1368 | n_iov++; | |
1369 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1370 | iov[n_iov].iov_len = len; |
1371 | bytes_to_write += len; | |
37c0eb46 SF |
1372 | |
1373 | if (first < 0) { | |
1374 | first = i; | |
1375 | offset = page_offset(page); | |
1376 | } | |
1377 | next = page->index + 1; | |
1378 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1379 | break; | |
1380 | } | |
1381 | if (n_iov) { | |
6508d904 JL |
1382 | open_file = find_writable_file(CIFS_I(mapping->host), |
1383 | false); | |
23e7dd7d | 1384 | if (!open_file) { |
b6b38f70 | 1385 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1386 | rc = -EBADF; |
1047abc1 | 1387 | } else { |
fbec9ab9 | 1388 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1389 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1390 | bytes_to_write, offset, |
1391 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1392 | long_op); |
6ab409b5 | 1393 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1394 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1395 | } |
fbec9ab9 | 1396 | |
f3983c21 JL |
1397 | if (rc || bytes_written < bytes_to_write) { |
1398 | cERROR(1, "Write2 ret %d, wrote %d", | |
1399 | rc, bytes_written); | |
eb4b756b | 1400 | mapping_set_error(mapping, rc); |
f3983c21 JL |
1401 | } else { |
1402 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1403 | } |
f3983c21 | 1404 | |
37c0eb46 SF |
1405 | for (i = 0; i < n_iov; i++) { |
1406 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1407 | /* Should we also set page error on |
1408 | success rc but too little data written? */ | |
1409 | /* BB investigate retry logic on temporary | |
1410 | server crash cases and how recovery works | |
fb8c4b14 SF |
1411 | when page marked as error */ |
1412 | if (rc) | |
eb9bdaa3 | 1413 | SetPageError(page); |
37c0eb46 SF |
1414 | kunmap(page); |
1415 | unlock_page(page); | |
cb876f45 | 1416 | end_page_writeback(page); |
37c0eb46 SF |
1417 | page_cache_release(page); |
1418 | } | |
1419 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1420 | done = 1; | |
1421 | index = next; | |
b066a48c DK |
1422 | } else |
1423 | /* Need to re-find the pages we skipped */ | |
1424 | index = pvec.pages[0]->index + 1; | |
1425 | ||
37c0eb46 SF |
1426 | pagevec_release(&pvec); |
1427 | } | |
1428 | if (!scanned && !done) { | |
1429 | /* | |
1430 | * We hit the last page and there is more work to be done: wrap | |
1431 | * back to the start of the file | |
1432 | */ | |
1433 | scanned = 1; | |
1434 | index = 0; | |
1435 | goto retry; | |
1436 | } | |
111ebb6e | 1437 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1438 | mapping->writeback_index = index; |
1439 | ||
1da177e4 | 1440 | FreeXid(xid); |
9a0c8230 | 1441 | kfree(iov); |
1da177e4 LT |
1442 | return rc; |
1443 | } | |
1da177e4 | 1444 | |
fb8c4b14 | 1445 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1446 | { |
1447 | int rc = -EFAULT; | |
1448 | int xid; | |
1449 | ||
1450 | xid = GetXid(); | |
1451 | /* BB add check for wbc flags */ | |
1452 | page_cache_get(page); | |
ad7a2926 | 1453 | if (!PageUptodate(page)) |
b6b38f70 | 1454 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1455 | |
1456 | /* | |
1457 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1458 | * | |
1459 | * A writepage() implementation always needs to do either this, | |
1460 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1461 | * the case of a failure. | |
1462 | * | |
1463 | * Just unlocking the page will cause the radix tree tag-bits | |
1464 | * to fail to update with the state of the page correctly. | |
1465 | */ | |
fb8c4b14 | 1466 | set_page_writeback(page); |
1da177e4 LT |
1467 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1468 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1469 | unlock_page(page); | |
cb876f45 LT |
1470 | end_page_writeback(page); |
1471 | page_cache_release(page); | |
1da177e4 LT |
1472 | FreeXid(xid); |
1473 | return rc; | |
1474 | } | |
1475 | ||
d9414774 NP |
1476 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1477 | loff_t pos, unsigned len, unsigned copied, | |
1478 | struct page *page, void *fsdata) | |
1da177e4 | 1479 | { |
d9414774 NP |
1480 | int rc; |
1481 | struct inode *inode = mapping->host; | |
1da177e4 | 1482 | |
b6b38f70 JP |
1483 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1484 | page, pos, copied); | |
d9414774 | 1485 | |
a98ee8c1 JL |
1486 | if (PageChecked(page)) { |
1487 | if (copied == len) | |
1488 | SetPageUptodate(page); | |
1489 | ClearPageChecked(page); | |
1490 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1491 | SetPageUptodate(page); |
ad7a2926 | 1492 | |
1da177e4 | 1493 | if (!PageUptodate(page)) { |
d9414774 NP |
1494 | char *page_data; |
1495 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1496 | int xid; | |
1497 | ||
1498 | xid = GetXid(); | |
1da177e4 LT |
1499 | /* this is probably better than directly calling |
1500 | partialpage_write since in this function the file handle is | |
1501 | known which we might as well leverage */ | |
1502 | /* BB check if anything else missing out of ppw | |
1503 | such as updating last write time */ | |
1504 | page_data = kmap(page); | |
7da4b49a JL |
1505 | rc = cifs_write(file->private_data, page_data + offset, |
1506 | copied, &pos); | |
d9414774 | 1507 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1508 | kunmap(page); |
d9414774 NP |
1509 | |
1510 | FreeXid(xid); | |
fb8c4b14 | 1511 | } else { |
d9414774 NP |
1512 | rc = copied; |
1513 | pos += copied; | |
1da177e4 LT |
1514 | set_page_dirty(page); |
1515 | } | |
1516 | ||
d9414774 NP |
1517 | if (rc > 0) { |
1518 | spin_lock(&inode->i_lock); | |
1519 | if (pos > inode->i_size) | |
1520 | i_size_write(inode, pos); | |
1521 | spin_unlock(&inode->i_lock); | |
1522 | } | |
1523 | ||
1524 | unlock_page(page); | |
1525 | page_cache_release(page); | |
1526 | ||
1da177e4 LT |
1527 | return rc; |
1528 | } | |
1529 | ||
7ea80859 | 1530 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1531 | { |
1532 | int xid; | |
1533 | int rc = 0; | |
b298f223 | 1534 | struct cifsTconInfo *tcon; |
c21dfb69 | 1535 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1536 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1537 | |
1538 | xid = GetXid(); | |
1539 | ||
b6b38f70 | 1540 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1541 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1542 | |
cea21805 JL |
1543 | rc = filemap_write_and_wait(inode->i_mapping); |
1544 | if (rc == 0) { | |
eb4b756b JL |
1545 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1546 | ||
13cfb733 | 1547 | tcon = tlink_tcon(smbfile->tlink); |
eb4b756b | 1548 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1549 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1550 | } |
b298f223 | 1551 | |
1da177e4 LT |
1552 | FreeXid(xid); |
1553 | return rc; | |
1554 | } | |
1555 | ||
3978d717 | 1556 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1557 | { |
1558 | struct address_space *mapping; | |
1559 | struct inode *inode; | |
1560 | unsigned long index = page->index; | |
1561 | unsigned int rpages = 0; | |
1562 | int rc = 0; | |
1563 | ||
f19159dc | 1564 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1565 | mapping = page->mapping; |
1566 | if (!mapping) | |
1567 | return 0; | |
1568 | inode = mapping->host; | |
1569 | if (!inode) | |
3978d717 | 1570 | return; */ |
1da177e4 | 1571 | |
fb8c4b14 | 1572 | /* fill in rpages then |
1da177e4 LT |
1573 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1574 | ||
b6b38f70 | 1575 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1576 | |
3978d717 | 1577 | #if 0 |
1da177e4 LT |
1578 | if (rc < 0) |
1579 | return rc; | |
1580 | return 0; | |
3978d717 | 1581 | #endif |
1da177e4 LT |
1582 | } */ |
1583 | ||
1584 | /* | |
1585 | * As file closes, flush all cached write data for this inode checking | |
1586 | * for write behind errors. | |
1587 | */ | |
75e1fcc0 | 1588 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1589 | { |
fb8c4b14 | 1590 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1591 | int rc = 0; |
1592 | ||
eb4b756b | 1593 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1594 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1595 | |
b6b38f70 | 1596 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1597 | |
1598 | return rc; | |
1599 | } | |
1600 | ||
1601 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1602 | size_t read_size, loff_t *poffset) | |
1603 | { | |
1604 | int rc = -EACCES; | |
1605 | unsigned int bytes_read = 0; | |
1606 | unsigned int total_read = 0; | |
1607 | unsigned int current_read_size; | |
1608 | struct cifs_sb_info *cifs_sb; | |
1609 | struct cifsTconInfo *pTcon; | |
1610 | int xid; | |
1611 | struct cifsFileInfo *open_file; | |
1612 | char *smb_read_data; | |
1613 | char __user *current_offset; | |
1614 | struct smb_com_read_rsp *pSMBr; | |
1615 | ||
1616 | xid = GetXid(); | |
e6a00296 | 1617 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1618 | |
1619 | if (file->private_data == NULL) { | |
0f3bc09e | 1620 | rc = -EBADF; |
1da177e4 | 1621 | FreeXid(xid); |
0f3bc09e | 1622 | return rc; |
1da177e4 | 1623 | } |
c21dfb69 | 1624 | open_file = file->private_data; |
13cfb733 | 1625 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1626 | |
ad7a2926 | 1627 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1628 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1629 | |
1da177e4 LT |
1630 | for (total_read = 0, current_offset = read_data; |
1631 | read_size > total_read; | |
1632 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1633 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1634 | cifs_sb->rsize); |
1635 | rc = -EAGAIN; | |
1636 | smb_read_data = NULL; | |
1637 | while (rc == -EAGAIN) { | |
ec637e3f | 1638 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1639 | if (open_file->invalidHandle) { |
15886177 | 1640 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1641 | if (rc != 0) |
1642 | break; | |
1643 | } | |
bfa0d75a | 1644 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1645 | open_file->netfid, |
1646 | current_read_size, *poffset, | |
1647 | &bytes_read, &smb_read_data, | |
1648 | &buf_type); | |
1da177e4 | 1649 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1650 | if (smb_read_data) { |
93544cc6 SF |
1651 | if (copy_to_user(current_offset, |
1652 | smb_read_data + | |
1653 | 4 /* RFC1001 length field */ + | |
1654 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1655 | bytes_read)) |
93544cc6 | 1656 | rc = -EFAULT; |
93544cc6 | 1657 | |
fb8c4b14 | 1658 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1659 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1660 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1661 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1662 | smb_read_data = NULL; |
1663 | } | |
1664 | } | |
1665 | if (rc || (bytes_read == 0)) { | |
1666 | if (total_read) { | |
1667 | break; | |
1668 | } else { | |
1669 | FreeXid(xid); | |
1670 | return rc; | |
1671 | } | |
1672 | } else { | |
a4544347 | 1673 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1674 | *poffset += bytes_read; |
1675 | } | |
1676 | } | |
1677 | FreeXid(xid); | |
1678 | return total_read; | |
1679 | } | |
1680 | ||
1681 | ||
1682 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1683 | loff_t *poffset) | |
1684 | { | |
1685 | int rc = -EACCES; | |
1686 | unsigned int bytes_read = 0; | |
1687 | unsigned int total_read; | |
1688 | unsigned int current_read_size; | |
1689 | struct cifs_sb_info *cifs_sb; | |
1690 | struct cifsTconInfo *pTcon; | |
1691 | int xid; | |
1692 | char *current_offset; | |
1693 | struct cifsFileInfo *open_file; | |
ec637e3f | 1694 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1695 | |
1696 | xid = GetXid(); | |
e6a00296 | 1697 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1698 | |
1699 | if (file->private_data == NULL) { | |
0f3bc09e | 1700 | rc = -EBADF; |
1da177e4 | 1701 | FreeXid(xid); |
0f3bc09e | 1702 | return rc; |
1da177e4 | 1703 | } |
c21dfb69 | 1704 | open_file = file->private_data; |
13cfb733 | 1705 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1706 | |
1707 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1708 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1709 | |
fb8c4b14 | 1710 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1711 | read_size > total_read; |
1712 | total_read += bytes_read, current_offset += bytes_read) { | |
1713 | current_read_size = min_t(const int, read_size - total_read, | |
1714 | cifs_sb->rsize); | |
f9f5c817 SF |
1715 | /* For windows me and 9x we do not want to request more |
1716 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1717 | if ((pTcon->ses) && |
f9f5c817 SF |
1718 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1719 | current_read_size = min_t(const int, current_read_size, | |
1720 | pTcon->ses->server->maxBuf - 128); | |
1721 | } | |
1da177e4 LT |
1722 | rc = -EAGAIN; |
1723 | while (rc == -EAGAIN) { | |
cdff08e7 | 1724 | if (open_file->invalidHandle) { |
15886177 | 1725 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1726 | if (rc != 0) |
1727 | break; | |
1728 | } | |
bfa0d75a | 1729 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1730 | open_file->netfid, |
1731 | current_read_size, *poffset, | |
1732 | &bytes_read, ¤t_offset, | |
1733 | &buf_type); | |
1da177e4 LT |
1734 | } |
1735 | if (rc || (bytes_read == 0)) { | |
1736 | if (total_read) { | |
1737 | break; | |
1738 | } else { | |
1739 | FreeXid(xid); | |
1740 | return rc; | |
1741 | } | |
1742 | } else { | |
a4544347 | 1743 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1744 | *poffset += bytes_read; |
1745 | } | |
1746 | } | |
1747 | FreeXid(xid); | |
1748 | return total_read; | |
1749 | } | |
1750 | ||
1751 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1752 | { | |
1da177e4 LT |
1753 | int rc, xid; |
1754 | ||
1755 | xid = GetXid(); | |
abab095d | 1756 | rc = cifs_revalidate_file(file); |
1da177e4 | 1757 | if (rc) { |
b6b38f70 | 1758 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1759 | FreeXid(xid); |
1760 | return rc; | |
1761 | } | |
1762 | rc = generic_file_mmap(file, vma); | |
1763 | FreeXid(xid); | |
1764 | return rc; | |
1765 | } | |
1766 | ||
1767 | ||
fb8c4b14 | 1768 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1769 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1770 | { |
1771 | struct page *page; | |
1772 | char *target; | |
1773 | ||
1774 | while (bytes_read > 0) { | |
1775 | if (list_empty(pages)) | |
1776 | break; | |
1777 | ||
1778 | page = list_entry(pages->prev, struct page, lru); | |
1779 | list_del(&page->lru); | |
1780 | ||
315e995c | 1781 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1782 | GFP_KERNEL)) { |
1783 | page_cache_release(page); | |
b6b38f70 | 1784 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1785 | data += PAGE_CACHE_SIZE; |
1786 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1787 | continue; |
1788 | } | |
06b43672 | 1789 | page_cache_release(page); |
1da177e4 | 1790 | |
fb8c4b14 | 1791 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1792 | |
1793 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1794 | memcpy(target, data, bytes_read); | |
1795 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1796 | memset(target + bytes_read, 0, |
1da177e4 LT |
1797 | PAGE_CACHE_SIZE - bytes_read); |
1798 | bytes_read = 0; | |
1799 | } else { | |
1800 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1801 | bytes_read -= PAGE_CACHE_SIZE; | |
1802 | } | |
1803 | kunmap_atomic(target, KM_USER0); | |
1804 | ||
1805 | flush_dcache_page(page); | |
1806 | SetPageUptodate(page); | |
1807 | unlock_page(page); | |
1da177e4 | 1808 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1809 | |
1810 | /* add page to FS-Cache */ | |
1811 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1812 | } |
1813 | return; | |
1814 | } | |
1815 | ||
1816 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1817 | struct list_head *page_list, unsigned num_pages) | |
1818 | { | |
1819 | int rc = -EACCES; | |
1820 | int xid; | |
1821 | loff_t offset; | |
1822 | struct page *page; | |
1823 | struct cifs_sb_info *cifs_sb; | |
1824 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1825 | unsigned int bytes_read = 0; |
fb8c4b14 | 1826 | unsigned int read_size, i; |
1da177e4 LT |
1827 | char *smb_read_data = NULL; |
1828 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1829 | struct cifsFileInfo *open_file; |
ec637e3f | 1830 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1831 | |
1832 | xid = GetXid(); | |
1833 | if (file->private_data == NULL) { | |
0f3bc09e | 1834 | rc = -EBADF; |
1da177e4 | 1835 | FreeXid(xid); |
0f3bc09e | 1836 | return rc; |
1da177e4 | 1837 | } |
c21dfb69 | 1838 | open_file = file->private_data; |
e6a00296 | 1839 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1840 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1841 | |
56698236 SJ |
1842 | /* |
1843 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1844 | * immediately if the cookie is negative | |
1845 | */ | |
1846 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1847 | &num_pages); | |
1848 | if (rc == 0) | |
1849 | goto read_complete; | |
1850 | ||
f19159dc | 1851 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1852 | for (i = 0; i < num_pages; ) { |
1853 | unsigned contig_pages; | |
1854 | struct page *tmp_page; | |
1855 | unsigned long expected_index; | |
1856 | ||
1857 | if (list_empty(page_list)) | |
1858 | break; | |
1859 | ||
1860 | page = list_entry(page_list->prev, struct page, lru); | |
1861 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1862 | ||
1863 | /* count adjacent pages that we will read into */ | |
1864 | contig_pages = 0; | |
fb8c4b14 | 1865 | expected_index = |
1da177e4 | 1866 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1867 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1868 | if (tmp_page->index == expected_index) { |
1869 | contig_pages++; | |
1870 | expected_index++; | |
1871 | } else | |
fb8c4b14 | 1872 | break; |
1da177e4 LT |
1873 | } |
1874 | if (contig_pages + i > num_pages) | |
1875 | contig_pages = num_pages - i; | |
1876 | ||
1877 | /* for reads over a certain size could initiate async | |
1878 | read ahead */ | |
1879 | ||
1880 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1881 | /* Read size needs to be in multiples of one page */ | |
1882 | read_size = min_t(const unsigned int, read_size, | |
1883 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
1884 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
1885 | read_size, contig_pages); | |
1da177e4 LT |
1886 | rc = -EAGAIN; |
1887 | while (rc == -EAGAIN) { | |
cdff08e7 | 1888 | if (open_file->invalidHandle) { |
15886177 | 1889 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1890 | if (rc != 0) |
1891 | break; | |
1892 | } | |
1893 | ||
bfa0d75a | 1894 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1895 | open_file->netfid, |
1896 | read_size, offset, | |
1897 | &bytes_read, &smb_read_data, | |
1898 | &buf_type); | |
a9d02ad4 | 1899 | /* BB more RC checks ? */ |
fb8c4b14 | 1900 | if (rc == -EAGAIN) { |
1da177e4 | 1901 | if (smb_read_data) { |
fb8c4b14 | 1902 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1903 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1904 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1905 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1906 | smb_read_data = NULL; |
1907 | } | |
1908 | } | |
1909 | } | |
1910 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 1911 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
1912 | break; |
1913 | } else if (bytes_read > 0) { | |
6f88cc2e | 1914 | task_io_account_read(bytes_read); |
1da177e4 LT |
1915 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1916 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1917 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 1918 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
1919 | |
1920 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1921 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1922 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1923 | i++; /* account for partial page */ |
1924 | ||
fb8c4b14 | 1925 | /* server copy of file can have smaller size |
1da177e4 | 1926 | than client */ |
fb8c4b14 SF |
1927 | /* BB do we need to verify this common case ? |
1928 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1929 | we will hit it on next read */ |
1930 | ||
05ac9d4b | 1931 | /* break; */ |
1da177e4 LT |
1932 | } |
1933 | } else { | |
b6b38f70 | 1934 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 1935 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 1936 | bytes_read, offset); |
fb8c4b14 | 1937 | /* BB turn off caching and do new lookup on |
1da177e4 | 1938 | file size at server? */ |
1da177e4 LT |
1939 | break; |
1940 | } | |
1941 | if (smb_read_data) { | |
fb8c4b14 | 1942 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1943 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1944 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1945 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1946 | smb_read_data = NULL; |
1947 | } | |
1948 | bytes_read = 0; | |
1949 | } | |
1950 | ||
1da177e4 LT |
1951 | /* need to free smb_read_data buf before exit */ |
1952 | if (smb_read_data) { | |
fb8c4b14 | 1953 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1954 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1955 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1956 | cifs_buf_release(smb_read_data); |
1da177e4 | 1957 | smb_read_data = NULL; |
fb8c4b14 | 1958 | } |
1da177e4 | 1959 | |
56698236 | 1960 | read_complete: |
1da177e4 LT |
1961 | FreeXid(xid); |
1962 | return rc; | |
1963 | } | |
1964 | ||
1965 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1966 | loff_t *poffset) | |
1967 | { | |
1968 | char *read_data; | |
1969 | int rc; | |
1970 | ||
56698236 SJ |
1971 | /* Is the page cached? */ |
1972 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
1973 | if (rc == 0) | |
1974 | goto read_complete; | |
1975 | ||
1da177e4 LT |
1976 | page_cache_get(page); |
1977 | read_data = kmap(page); | |
1978 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1979 | |
1da177e4 | 1980 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1981 | |
1da177e4 LT |
1982 | if (rc < 0) |
1983 | goto io_error; | |
1984 | else | |
b6b38f70 | 1985 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 1986 | |
e6a00296 JJS |
1987 | file->f_path.dentry->d_inode->i_atime = |
1988 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1989 | |
1da177e4 LT |
1990 | if (PAGE_CACHE_SIZE > rc) |
1991 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1992 | ||
1993 | flush_dcache_page(page); | |
1994 | SetPageUptodate(page); | |
9dc06558 SJ |
1995 | |
1996 | /* send this page to the cache */ | |
1997 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
1998 | ||
1da177e4 | 1999 | rc = 0; |
fb8c4b14 | 2000 | |
1da177e4 | 2001 | io_error: |
fb8c4b14 | 2002 | kunmap(page); |
1da177e4 | 2003 | page_cache_release(page); |
56698236 SJ |
2004 | |
2005 | read_complete: | |
1da177e4 LT |
2006 | return rc; |
2007 | } | |
2008 | ||
2009 | static int cifs_readpage(struct file *file, struct page *page) | |
2010 | { | |
2011 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2012 | int rc = -EACCES; | |
2013 | int xid; | |
2014 | ||
2015 | xid = GetXid(); | |
2016 | ||
2017 | if (file->private_data == NULL) { | |
0f3bc09e | 2018 | rc = -EBADF; |
1da177e4 | 2019 | FreeXid(xid); |
0f3bc09e | 2020 | return rc; |
1da177e4 LT |
2021 | } |
2022 | ||
b6b38f70 JP |
2023 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2024 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2025 | |
2026 | rc = cifs_readpage_worker(file, page, &offset); | |
2027 | ||
2028 | unlock_page(page); | |
2029 | ||
2030 | FreeXid(xid); | |
2031 | return rc; | |
2032 | } | |
2033 | ||
a403a0a3 SF |
2034 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2035 | { | |
2036 | struct cifsFileInfo *open_file; | |
2037 | ||
4477288a | 2038 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2039 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2040 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2041 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2042 | return 1; |
2043 | } | |
2044 | } | |
4477288a | 2045 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2046 | return 0; |
2047 | } | |
2048 | ||
1da177e4 LT |
2049 | /* We do not want to update the file size from server for inodes |
2050 | open for write - to avoid races with writepage extending | |
2051 | the file - in the future we could consider allowing | |
fb8c4b14 | 2052 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2053 | but this is tricky to do without racing with writebehind |
2054 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2055 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2056 | { |
a403a0a3 | 2057 | if (!cifsInode) |
4b18f2a9 | 2058 | return true; |
50c2f753 | 2059 | |
a403a0a3 SF |
2060 | if (is_inode_writable(cifsInode)) { |
2061 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2062 | struct cifs_sb_info *cifs_sb; |
2063 | ||
c32a0b68 | 2064 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2065 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2066 | /* since no page cache to corrupt on directio |
c32a0b68 | 2067 | we can change size safely */ |
4b18f2a9 | 2068 | return true; |
c32a0b68 SF |
2069 | } |
2070 | ||
fb8c4b14 | 2071 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2072 | return true; |
7ba52631 | 2073 | |
4b18f2a9 | 2074 | return false; |
23e7dd7d | 2075 | } else |
4b18f2a9 | 2076 | return true; |
1da177e4 LT |
2077 | } |
2078 | ||
d9414774 NP |
2079 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2080 | loff_t pos, unsigned len, unsigned flags, | |
2081 | struct page **pagep, void **fsdata) | |
1da177e4 | 2082 | { |
d9414774 NP |
2083 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2084 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2085 | loff_t page_start = pos & PAGE_MASK; |
2086 | loff_t i_size; | |
2087 | struct page *page; | |
2088 | int rc = 0; | |
d9414774 | 2089 | |
b6b38f70 | 2090 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2091 | |
54566b2c | 2092 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2093 | if (!page) { |
2094 | rc = -ENOMEM; | |
2095 | goto out; | |
2096 | } | |
8a236264 | 2097 | |
a98ee8c1 JL |
2098 | if (PageUptodate(page)) |
2099 | goto out; | |
8a236264 | 2100 | |
a98ee8c1 JL |
2101 | /* |
2102 | * If we write a full page it will be up to date, no need to read from | |
2103 | * the server. If the write is short, we'll end up doing a sync write | |
2104 | * instead. | |
2105 | */ | |
2106 | if (len == PAGE_CACHE_SIZE) | |
2107 | goto out; | |
8a236264 | 2108 | |
a98ee8c1 JL |
2109 | /* |
2110 | * optimize away the read when we have an oplock, and we're not | |
2111 | * expecting to use any of the data we'd be reading in. That | |
2112 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2113 | * and the write will cover all of the existing data. | |
2114 | */ | |
2115 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2116 | i_size = i_size_read(mapping->host); | |
2117 | if (page_start >= i_size || | |
2118 | (offset == 0 && (pos + len) >= i_size)) { | |
2119 | zero_user_segments(page, 0, offset, | |
2120 | offset + len, | |
2121 | PAGE_CACHE_SIZE); | |
2122 | /* | |
2123 | * PageChecked means that the parts of the page | |
2124 | * to which we're not writing are considered up | |
2125 | * to date. Once the data is copied to the | |
2126 | * page, it can be set uptodate. | |
2127 | */ | |
2128 | SetPageChecked(page); | |
2129 | goto out; | |
2130 | } | |
2131 | } | |
d9414774 | 2132 | |
a98ee8c1 JL |
2133 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2134 | /* | |
2135 | * might as well read a page, it is fast enough. If we get | |
2136 | * an error, we don't need to return it. cifs_write_end will | |
2137 | * do a sync write instead since PG_uptodate isn't set. | |
2138 | */ | |
2139 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2140 | } else { |
2141 | /* we could try using another file handle if there is one - | |
2142 | but how would we lock it to prevent close of that handle | |
2143 | racing with this read? In any case | |
d9414774 | 2144 | this will be written out by write_end so is fine */ |
1da177e4 | 2145 | } |
a98ee8c1 JL |
2146 | out: |
2147 | *pagep = page; | |
2148 | return rc; | |
1da177e4 LT |
2149 | } |
2150 | ||
85f2d6b4 SJ |
2151 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2152 | { | |
2153 | if (PagePrivate(page)) | |
2154 | return 0; | |
2155 | ||
2156 | return cifs_fscache_release_page(page, gfp); | |
2157 | } | |
2158 | ||
2159 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2160 | { | |
2161 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2162 | ||
2163 | if (offset == 0) | |
2164 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2165 | } | |
2166 | ||
9b646972 | 2167 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2168 | { |
2169 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2170 | oplock_break); | |
a5e18bc3 | 2171 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2172 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2173 | int rc = 0; |
3bc303c2 JL |
2174 | |
2175 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2176 | if (cinode->clientCanCacheRead) |
8737c930 | 2177 | break_lease(inode, O_RDONLY); |
d54ff732 | 2178 | else |
8737c930 | 2179 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2180 | rc = filemap_fdatawrite(inode->i_mapping); |
2181 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2182 | rc = filemap_fdatawait(inode->i_mapping); |
2183 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2184 | invalidate_remote_inode(inode); |
2185 | } | |
b6b38f70 | 2186 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2187 | } |
2188 | ||
2189 | /* | |
2190 | * releasing stale oplock after recent reconnect of smb session using | |
2191 | * a now incorrect file handle is not a data integrity issue but do | |
2192 | * not bother sending an oplock release if session to server still is | |
2193 | * disconnected since oplock already released by the server | |
2194 | */ | |
cdff08e7 | 2195 | if (!cfile->oplock_break_cancelled) { |
13cfb733 JL |
2196 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2197 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2198 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2199 | } |
9b646972 TH |
2200 | |
2201 | /* | |
2202 | * We might have kicked in before is_valid_oplock_break() | |
2203 | * finished grabbing reference for us. Make sure it's done by | |
6573e9b7 | 2204 | * waiting for cifs_file_list_lock. |
9b646972 | 2205 | */ |
4477288a JL |
2206 | spin_lock(&cifs_file_list_lock); |
2207 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2208 | |
2209 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2210 | } |
2211 | ||
5f6dbc9e | 2212 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2213 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2214 | { |
d7c86ff8 | 2215 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2216 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2217 | } |
2218 | ||
9b646972 | 2219 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2220 | { |
ebe2e91e JL |
2221 | struct super_block *sb = cfile->dentry->d_sb; |
2222 | ||
3bc303c2 | 2223 | cifsFileInfo_put(cfile); |
ebe2e91e | 2224 | cifs_sb_deactive(sb); |
3bc303c2 JL |
2225 | } |
2226 | ||
f5e54d6e | 2227 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2228 | .readpage = cifs_readpage, |
2229 | .readpages = cifs_readpages, | |
2230 | .writepage = cifs_writepage, | |
37c0eb46 | 2231 | .writepages = cifs_writepages, |
d9414774 NP |
2232 | .write_begin = cifs_write_begin, |
2233 | .write_end = cifs_write_end, | |
1da177e4 | 2234 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2235 | .releasepage = cifs_release_page, |
2236 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2237 | /* .sync_page = cifs_sync_page, */ |
2238 | /* .direct_IO = */ | |
2239 | }; | |
273d81d6 DK |
2240 | |
2241 | /* | |
2242 | * cifs_readpages requires the server to support a buffer large enough to | |
2243 | * contain the header plus one complete page of data. Otherwise, we need | |
2244 | * to leave cifs_readpages out of the address space operations. | |
2245 | */ | |
f5e54d6e | 2246 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2247 | .readpage = cifs_readpage, |
2248 | .writepage = cifs_writepage, | |
2249 | .writepages = cifs_writepages, | |
d9414774 NP |
2250 | .write_begin = cifs_write_begin, |
2251 | .write_end = cifs_write_end, | |
273d81d6 | 2252 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2253 | .releasepage = cifs_release_page, |
2254 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2255 | /* .sync_page = cifs_sync_page, */ |
2256 | /* .direct_IO = */ | |
2257 | }; |