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 | }; | |
d44a9fe2 JL |
427 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
428 | pCifsFile->pid); | |
1da177e4 LT |
429 | } |
430 | ||
431 | out: | |
1da177e4 LT |
432 | kfree(full_path); |
433 | FreeXid(xid); | |
7ffec372 | 434 | cifs_put_tlink(tlink); |
1da177e4 LT |
435 | return rc; |
436 | } | |
437 | ||
0418726b | 438 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
439 | /* to server was lost */ |
440 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
441 | { | |
442 | int rc = 0; | |
443 | ||
444 | /* BB list all locks open on this file and relock */ | |
445 | ||
446 | return rc; | |
447 | } | |
448 | ||
15886177 | 449 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
450 | { |
451 | int rc = -EACCES; | |
590a3fe0 JL |
452 | int xid; |
453 | __u32 oplock; | |
1da177e4 | 454 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 455 | struct cifsTconInfo *tcon; |
1da177e4 | 456 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 457 | struct inode *inode; |
1da177e4 LT |
458 | char *full_path = NULL; |
459 | int desiredAccess; | |
460 | int disposition = FILE_OPEN; | |
461 | __u16 netfid; | |
462 | ||
1da177e4 | 463 | xid = GetXid(); |
f0a71eb8 | 464 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 465 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 466 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 467 | rc = 0; |
1da177e4 | 468 | FreeXid(xid); |
0f3bc09e | 469 | return rc; |
1da177e4 LT |
470 | } |
471 | ||
15886177 | 472 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 473 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 474 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 475 | |
1da177e4 LT |
476 | /* can not grab rename sem here because various ops, including |
477 | those that already have the rename sem can end up causing writepage | |
478 | to get called and if the server was down that means we end up here, | |
479 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 480 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 481 | if (full_path == NULL) { |
3a9f462f | 482 | rc = -ENOMEM; |
f0a71eb8 | 483 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 484 | FreeXid(xid); |
3a9f462f | 485 | return rc; |
1da177e4 LT |
486 | } |
487 | ||
b6b38f70 | 488 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 489 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
490 | |
491 | if (oplockEnabled) | |
492 | oplock = REQ_OPLOCK; | |
493 | else | |
4b18f2a9 | 494 | oplock = 0; |
1da177e4 | 495 | |
7fc8f4e9 SF |
496 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
497 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
498 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
499 | |
500 | /* | |
501 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
502 | * original open. Must mask them off for a reopen. | |
503 | */ | |
15886177 JL |
504 | unsigned int oflags = pCifsFile->f_flags & |
505 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 506 | |
2422f676 | 507 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
508 | cifs_sb->mnt_file_mode /* ignored */, |
509 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 510 | if (rc == 0) { |
b6b38f70 | 511 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
512 | goto reopen_success; |
513 | } | |
514 | /* fallthrough to retry open the old way on errors, especially | |
515 | in the reconnect path it is important to retry hard */ | |
516 | } | |
517 | ||
15886177 | 518 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 519 | |
1da177e4 | 520 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
521 | by SMBOpen and then calling get_inode_info with returned buf |
522 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
523 | and server version of file size can be stale. If we knew for sure |
524 | that inode was not dirty locally we could do this */ | |
525 | ||
7fc8f4e9 | 526 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 527 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 528 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 529 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 530 | if (rc) { |
f0a71eb8 | 531 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
532 | cFYI(1, "cifs_open returned 0x%x", rc); |
533 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
534 | goto reopen_error_exit; |
535 | } | |
536 | ||
7fc8f4e9 | 537 | reopen_success: |
15886177 JL |
538 | pCifsFile->netfid = netfid; |
539 | pCifsFile->invalidHandle = false; | |
540 | mutex_unlock(&pCifsFile->fh_mutex); | |
541 | pCifsInode = CIFS_I(inode); | |
542 | ||
543 | if (can_flush) { | |
544 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 545 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 546 | |
15886177 JL |
547 | if (tcon->unix_ext) |
548 | rc = cifs_get_inode_info_unix(&inode, | |
549 | full_path, inode->i_sb, xid); | |
550 | else | |
551 | rc = cifs_get_inode_info(&inode, | |
552 | full_path, NULL, inode->i_sb, | |
553 | xid, NULL); | |
554 | } /* else we are writing out data to server already | |
555 | and could deadlock if we tried to flush data, and | |
556 | since we do not know if we have data that would | |
557 | invalidate the current end of file on the server | |
558 | we can not go to the server to get the new inod | |
559 | info */ | |
e66673e3 | 560 | |
c6723628 | 561 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 562 | |
15886177 JL |
563 | cifs_relock_file(pCifsFile); |
564 | ||
565 | reopen_error_exit: | |
1da177e4 LT |
566 | kfree(full_path); |
567 | FreeXid(xid); | |
568 | return rc; | |
569 | } | |
570 | ||
571 | int cifs_close(struct inode *inode, struct file *file) | |
572 | { | |
cdff08e7 SF |
573 | cifsFileInfo_put(file->private_data); |
574 | file->private_data = NULL; | |
7ee1af76 | 575 | |
cdff08e7 SF |
576 | /* return code from the ->release op is always ignored */ |
577 | return 0; | |
1da177e4 LT |
578 | } |
579 | ||
580 | int cifs_closedir(struct inode *inode, struct file *file) | |
581 | { | |
582 | int rc = 0; | |
583 | int xid; | |
c21dfb69 | 584 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
585 | char *ptmp; |
586 | ||
b6b38f70 | 587 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
588 | |
589 | xid = GetXid(); | |
590 | ||
591 | if (pCFileStruct) { | |
13cfb733 | 592 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 593 | |
b6b38f70 | 594 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 595 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
596 | if (!pCFileStruct->srch_inf.endOfSearch && |
597 | !pCFileStruct->invalidHandle) { | |
598 | pCFileStruct->invalidHandle = true; | |
4477288a | 599 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 600 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
601 | cFYI(1, "Closing uncompleted readdir with rc %d", |
602 | rc); | |
1da177e4 LT |
603 | /* not much we can do if it fails anyway, ignore rc */ |
604 | rc = 0; | |
ddb4cbfc | 605 | } else |
4477288a | 606 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
607 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
608 | if (ptmp) { | |
b6b38f70 | 609 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 610 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 611 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
612 | cifs_small_buf_release(ptmp); |
613 | else | |
614 | cifs_buf_release(ptmp); | |
1da177e4 | 615 | } |
13cfb733 | 616 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
617 | kfree(file->private_data); |
618 | file->private_data = NULL; | |
619 | } | |
620 | /* BB can we lock the filestruct while this is going on? */ | |
621 | FreeXid(xid); | |
622 | return rc; | |
623 | } | |
624 | ||
7ee1af76 JA |
625 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
626 | __u64 offset, __u8 lockType) | |
627 | { | |
fb8c4b14 SF |
628 | struct cifsLockInfo *li = |
629 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
630 | if (li == NULL) |
631 | return -ENOMEM; | |
632 | li->offset = offset; | |
633 | li->length = len; | |
634 | li->type = lockType; | |
796e5661 | 635 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 636 | list_add(&li->llist, &fid->llist); |
796e5661 | 637 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
638 | return 0; |
639 | } | |
640 | ||
1da177e4 LT |
641 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
642 | { | |
643 | int rc, xid; | |
1da177e4 LT |
644 | __u32 numLock = 0; |
645 | __u32 numUnlock = 0; | |
646 | __u64 length; | |
4b18f2a9 | 647 | bool wait_flag = false; |
1da177e4 | 648 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 649 | struct cifsTconInfo *tcon; |
08547b03 SF |
650 | __u16 netfid; |
651 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 652 | bool posix_locking = 0; |
1da177e4 LT |
653 | |
654 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
655 | rc = -EACCES; | |
656 | xid = GetXid(); | |
657 | ||
b6b38f70 | 658 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 659 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 660 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 661 | pfLock->fl_end); |
1da177e4 LT |
662 | |
663 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 664 | cFYI(1, "Posix"); |
1da177e4 | 665 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 666 | cFYI(1, "Flock"); |
1da177e4 | 667 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 668 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 669 | wait_flag = true; |
1da177e4 LT |
670 | } |
671 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
672 | cFYI(1, "Process suspended by mandatory locking - " |
673 | "not implemented yet"); | |
1da177e4 | 674 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 675 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 676 | if (pfLock->fl_flags & |
1da177e4 | 677 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 678 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
679 | |
680 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 681 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
682 | numLock = 1; |
683 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 684 | cFYI(1, "F_UNLCK"); |
1da177e4 | 685 | numUnlock = 1; |
d47d7c1a SF |
686 | /* Check if unlock includes more than |
687 | one lock range */ | |
1da177e4 | 688 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 689 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
690 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
691 | numLock = 1; | |
692 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 693 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
694 | numLock = 1; |
695 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 696 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
697 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
698 | numLock = 1; | |
699 | } else | |
b6b38f70 | 700 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 701 | |
e6a00296 | 702 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 703 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
08547b03 SF |
704 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
705 | ||
13a6e42a SF |
706 | if ((tcon->ses->capabilities & CAP_UNIX) && |
707 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 708 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 709 | posix_locking = 1; |
08547b03 SF |
710 | /* BB add code here to normalize offset and length to |
711 | account for negative length which we can not accept over the | |
712 | wire */ | |
1da177e4 | 713 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 714 | if (posix_locking) { |
08547b03 | 715 | int posix_lock_type; |
fb8c4b14 | 716 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
717 | posix_lock_type = CIFS_RDLCK; |
718 | else | |
719 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 720 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 721 | length, pfLock, |
08547b03 SF |
722 | posix_lock_type, wait_flag); |
723 | FreeXid(xid); | |
724 | return rc; | |
725 | } | |
726 | ||
727 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 728 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 729 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 730 | if (rc == 0) { |
13a6e42a | 731 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
732 | pfLock->fl_start, 1 /* numUnlock */ , |
733 | 0 /* numLock */ , lockType, | |
734 | 0 /* wait flag */ ); | |
735 | pfLock->fl_type = F_UNLCK; | |
736 | if (rc != 0) | |
b6b38f70 JP |
737 | cERROR(1, "Error unlocking previously locked " |
738 | "range %d during test of lock", rc); | |
1da177e4 LT |
739 | rc = 0; |
740 | ||
741 | } else { | |
742 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
743 | rc = 0; |
744 | ||
745 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
746 | pfLock->fl_type = F_WRLCK; | |
747 | } else { | |
748 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
749 | pfLock->fl_start, 0, 1, | |
750 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
751 | 0 /* wait flag */); | |
752 | if (rc == 0) { | |
753 | rc = CIFSSMBLock(xid, tcon, netfid, | |
754 | length, pfLock->fl_start, 1, 0, | |
755 | lockType | | |
756 | LOCKING_ANDX_SHARED_LOCK, | |
757 | 0 /* wait flag */); | |
758 | pfLock->fl_type = F_RDLCK; | |
759 | if (rc != 0) | |
f19159dc | 760 | cERROR(1, "Error unlocking " |
f05337c6 | 761 | "previously locked range %d " |
f19159dc | 762 | "during test of lock", rc); |
f05337c6 PS |
763 | rc = 0; |
764 | } else { | |
765 | pfLock->fl_type = F_WRLCK; | |
766 | rc = 0; | |
767 | } | |
768 | } | |
1da177e4 LT |
769 | } |
770 | ||
771 | FreeXid(xid); | |
772 | return rc; | |
773 | } | |
7ee1af76 JA |
774 | |
775 | if (!numLock && !numUnlock) { | |
776 | /* if no lock or unlock then nothing | |
777 | to do since we do not know what it is */ | |
778 | FreeXid(xid); | |
779 | return -EOPNOTSUPP; | |
780 | } | |
781 | ||
782 | if (posix_locking) { | |
08547b03 | 783 | int posix_lock_type; |
fb8c4b14 | 784 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
785 | posix_lock_type = CIFS_RDLCK; |
786 | else | |
787 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 788 | |
fb8c4b14 | 789 | if (numUnlock == 1) |
beb84dc8 | 790 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 791 | |
13a6e42a | 792 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 793 | length, pfLock, |
08547b03 | 794 | posix_lock_type, wait_flag); |
7ee1af76 | 795 | } else { |
c21dfb69 | 796 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
797 | |
798 | if (numLock) { | |
13a6e42a | 799 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 800 | pfLock->fl_start, |
7ee1af76 JA |
801 | 0, numLock, lockType, wait_flag); |
802 | ||
803 | if (rc == 0) { | |
804 | /* For Windows locks we must store them. */ | |
805 | rc = store_file_lock(fid, length, | |
806 | pfLock->fl_start, lockType); | |
807 | } | |
808 | } else if (numUnlock) { | |
809 | /* For each stored lock that this unlock overlaps | |
810 | completely, unlock it. */ | |
811 | int stored_rc = 0; | |
812 | struct cifsLockInfo *li, *tmp; | |
813 | ||
6b70c955 | 814 | rc = 0; |
796e5661 | 815 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
816 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
817 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 818 | (pfLock->fl_start + length) >= |
39db810c | 819 | (li->offset + li->length)) { |
13a6e42a | 820 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 821 | netfid, |
7ee1af76 | 822 | li->length, li->offset, |
4b18f2a9 | 823 | 1, 0, li->type, false); |
7ee1af76 JA |
824 | if (stored_rc) |
825 | rc = stored_rc; | |
2c964d1f PS |
826 | else { |
827 | list_del(&li->llist); | |
828 | kfree(li); | |
829 | } | |
7ee1af76 JA |
830 | } |
831 | } | |
796e5661 | 832 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
833 | } |
834 | } | |
835 | ||
d634cc15 | 836 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
837 | posix_lock_file_wait(file, pfLock); |
838 | FreeXid(xid); | |
839 | return rc; | |
840 | } | |
841 | ||
fbec9ab9 JL |
842 | /* |
843 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
844 | * these calls can be very long. | |
845 | * | |
846 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
847 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
848 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
849 | * welcome if someone wants to suggest one. | |
850 | * | |
851 | * We may be able to do a better job with this if there were some way to | |
852 | * declare that a file should be sparse. | |
853 | */ | |
854 | static int | |
855 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
856 | { | |
857 | if (offset <= cifsi->server_eof) | |
858 | return CIFS_STD_OP; | |
859 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
860 | return CIFS_VLONG_OP; | |
861 | else | |
862 | return CIFS_LONG_OP; | |
863 | } | |
864 | ||
865 | /* update the file size (if needed) after a write */ | |
866 | static void | |
867 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
868 | unsigned int bytes_written) | |
869 | { | |
870 | loff_t end_of_write = offset + bytes_written; | |
871 | ||
872 | if (end_of_write > cifsi->server_eof) | |
873 | cifsi->server_eof = end_of_write; | |
874 | } | |
875 | ||
1da177e4 LT |
876 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
877 | size_t write_size, loff_t *poffset) | |
878 | { | |
50ae28f0 | 879 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
880 | int rc = 0; |
881 | unsigned int bytes_written = 0; | |
882 | unsigned int total_written; | |
883 | struct cifs_sb_info *cifs_sb; | |
884 | struct cifsTconInfo *pTcon; | |
885 | int xid, long_op; | |
886 | struct cifsFileInfo *open_file; | |
50ae28f0 | 887 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
1da177e4 | 888 | |
e6a00296 | 889 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 890 | |
b6b38f70 JP |
891 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
892 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
893 | |
894 | if (file->private_data == NULL) | |
895 | return -EBADF; | |
ba00ba64 | 896 | |
c21dfb69 | 897 | open_file = file->private_data; |
13cfb733 | 898 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 899 | |
838726c4 JL |
900 | rc = generic_write_checks(file, poffset, &write_size, 0); |
901 | if (rc) | |
902 | return rc; | |
903 | ||
1da177e4 | 904 | xid = GetXid(); |
1da177e4 | 905 | |
fbec9ab9 | 906 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
907 | for (total_written = 0; write_size > total_written; |
908 | total_written += bytes_written) { | |
909 | rc = -EAGAIN; | |
910 | while (rc == -EAGAIN) { | |
911 | if (file->private_data == NULL) { | |
912 | /* file has been closed on us */ | |
913 | FreeXid(xid); | |
914 | /* if we have gotten here we have written some data | |
915 | and blocked, and the file has been freed on us while | |
916 | we blocked so return what we managed to write */ | |
917 | return total_written; | |
fb8c4b14 | 918 | } |
1da177e4 | 919 | if (open_file->invalidHandle) { |
1da177e4 LT |
920 | /* we could deadlock if we called |
921 | filemap_fdatawait from here so tell | |
922 | reopen_file not to flush data to server | |
923 | now */ | |
15886177 | 924 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
925 | if (rc != 0) |
926 | break; | |
927 | } | |
928 | ||
929 | rc = CIFSSMBWrite(xid, pTcon, | |
930 | open_file->netfid, | |
931 | min_t(const int, cifs_sb->wsize, | |
932 | write_size - total_written), | |
933 | *poffset, &bytes_written, | |
934 | NULL, write_data + total_written, long_op); | |
935 | } | |
936 | if (rc || (bytes_written == 0)) { | |
937 | if (total_written) | |
938 | break; | |
939 | else { | |
940 | FreeXid(xid); | |
941 | return rc; | |
942 | } | |
fbec9ab9 JL |
943 | } else { |
944 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 945 | *poffset += bytes_written; |
fbec9ab9 | 946 | } |
133672ef | 947 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
948 | 15 seconds is plenty */ |
949 | } | |
950 | ||
a4544347 | 951 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 952 | |
fb8c4b14 | 953 | /* Do not update local mtime - server will set its actual value on write |
50ae28f0 JS |
954 | * inode->i_ctime = inode->i_mtime = |
955 | * current_fs_time(inode->i_sb);*/ | |
956 | if (total_written > 0) { | |
957 | spin_lock(&inode->i_lock); | |
958 | if (*poffset > inode->i_size) | |
959 | i_size_write(inode, *poffset); | |
960 | spin_unlock(&inode->i_lock); | |
1da177e4 | 961 | } |
50ae28f0 JS |
962 | mark_inode_dirty_sync(inode); |
963 | ||
1da177e4 LT |
964 | FreeXid(xid); |
965 | return total_written; | |
966 | } | |
967 | ||
7da4b49a JL |
968 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
969 | const char *write_data, size_t write_size, | |
970 | loff_t *poffset) | |
1da177e4 LT |
971 | { |
972 | int rc = 0; | |
973 | unsigned int bytes_written = 0; | |
974 | unsigned int total_written; | |
975 | struct cifs_sb_info *cifs_sb; | |
976 | struct cifsTconInfo *pTcon; | |
977 | int xid, long_op; | |
7da4b49a JL |
978 | struct dentry *dentry = open_file->dentry; |
979 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 980 | |
7da4b49a | 981 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 982 | |
b6b38f70 | 983 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 984 | *poffset, dentry->d_name.name); |
1da177e4 | 985 | |
13cfb733 | 986 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 987 | |
1da177e4 | 988 | xid = GetXid(); |
1da177e4 | 989 | |
fbec9ab9 | 990 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
991 | for (total_written = 0; write_size > total_written; |
992 | total_written += bytes_written) { | |
993 | rc = -EAGAIN; | |
994 | while (rc == -EAGAIN) { | |
1da177e4 | 995 | if (open_file->invalidHandle) { |
1da177e4 LT |
996 | /* we could deadlock if we called |
997 | filemap_fdatawait from here so tell | |
fb8c4b14 | 998 | reopen_file not to flush data to |
1da177e4 | 999 | server now */ |
15886177 | 1000 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1001 | if (rc != 0) |
1002 | break; | |
1003 | } | |
fb8c4b14 SF |
1004 | if (experimEnabled || (pTcon->ses->server && |
1005 | ((pTcon->ses->server->secMode & | |
08775834 | 1006 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1007 | == 0))) { |
3e84469d SF |
1008 | struct kvec iov[2]; |
1009 | unsigned int len; | |
1010 | ||
0ae0efad | 1011 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1012 | write_size - total_written); |
1013 | /* iov[0] is reserved for smb header */ | |
1014 | iov[1].iov_base = (char *)write_data + | |
1015 | total_written; | |
1016 | iov[1].iov_len = len; | |
d6e04ae6 | 1017 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1018 | open_file->netfid, len, |
d6e04ae6 | 1019 | *poffset, &bytes_written, |
3e84469d | 1020 | iov, 1, long_op); |
d6e04ae6 | 1021 | } else |
60808233 SF |
1022 | rc = CIFSSMBWrite(xid, pTcon, |
1023 | open_file->netfid, | |
1024 | min_t(const int, cifs_sb->wsize, | |
1025 | write_size - total_written), | |
1026 | *poffset, &bytes_written, | |
1027 | write_data + total_written, | |
1028 | NULL, long_op); | |
1da177e4 LT |
1029 | } |
1030 | if (rc || (bytes_written == 0)) { | |
1031 | if (total_written) | |
1032 | break; | |
1033 | else { | |
1034 | FreeXid(xid); | |
1035 | return rc; | |
1036 | } | |
fbec9ab9 JL |
1037 | } else { |
1038 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1039 | *poffset += bytes_written; |
fbec9ab9 | 1040 | } |
133672ef | 1041 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1042 | 15 seconds is plenty */ |
1043 | } | |
1044 | ||
a4544347 | 1045 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1046 | |
7da4b49a JL |
1047 | if (total_written > 0) { |
1048 | spin_lock(&dentry->d_inode->i_lock); | |
1049 | if (*poffset > dentry->d_inode->i_size) | |
1050 | i_size_write(dentry->d_inode, *poffset); | |
1051 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1052 | } |
7da4b49a | 1053 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1054 | FreeXid(xid); |
1055 | return total_written; | |
1056 | } | |
1057 | ||
6508d904 JL |
1058 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1059 | bool fsuid_only) | |
630f3f0c SF |
1060 | { |
1061 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1062 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1063 | ||
1064 | /* only filter by fsuid on multiuser mounts */ | |
1065 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1066 | fsuid_only = false; | |
630f3f0c | 1067 | |
4477288a | 1068 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1069 | /* we could simply get the first_list_entry since write-only entries |
1070 | are always at the end of the list but since the first entry might | |
1071 | have a close pending, we go through the whole list */ | |
1072 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1073 | if (fsuid_only && open_file->uid != current_fsuid()) |
1074 | continue; | |
2e396b83 | 1075 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1076 | if (!open_file->invalidHandle) { |
1077 | /* found a good file */ | |
1078 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1079 | cifsFileInfo_get(open_file); |
4477288a | 1080 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1081 | return open_file; |
1082 | } /* else might as well continue, and look for | |
1083 | another, or simply have the caller reopen it | |
1084 | again rather than trying to fix this handle */ | |
1085 | } else /* write only file */ | |
1086 | break; /* write only files are last so must be done */ | |
1087 | } | |
4477288a | 1088 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1089 | return NULL; |
1090 | } | |
630f3f0c | 1091 | |
6508d904 JL |
1092 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1093 | bool fsuid_only) | |
6148a742 SF |
1094 | { |
1095 | struct cifsFileInfo *open_file; | |
d3892294 | 1096 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1097 | bool any_available = false; |
dd99cd80 | 1098 | int rc; |
6148a742 | 1099 | |
60808233 SF |
1100 | /* Having a null inode here (because mapping->host was set to zero by |
1101 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1102 | it being zero) during stress testcases so we need to check for it */ | |
1103 | ||
fb8c4b14 | 1104 | if (cifs_inode == NULL) { |
b6b38f70 | 1105 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1106 | dump_stack(); |
1107 | return NULL; | |
1108 | } | |
1109 | ||
d3892294 JL |
1110 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1111 | ||
6508d904 JL |
1112 | /* only filter by fsuid on multiuser mounts */ |
1113 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1114 | fsuid_only = false; | |
1115 | ||
4477288a | 1116 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1117 | refind_writable: |
6148a742 | 1118 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1119 | if (!any_available && open_file->pid != current->tgid) |
1120 | continue; | |
1121 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1122 | continue; |
2e396b83 | 1123 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1124 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1125 | |
1126 | if (!open_file->invalidHandle) { | |
1127 | /* found a good writable file */ | |
4477288a | 1128 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1129 | return open_file; |
1130 | } | |
8840dee9 | 1131 | |
4477288a | 1132 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1133 | |
9b22b0b7 | 1134 | /* Had to unlock since following call can block */ |
15886177 | 1135 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1136 | if (!rc) |
1137 | return open_file; | |
9b22b0b7 | 1138 | |
cdff08e7 | 1139 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1140 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1141 | cifsFileInfo_put(open_file); |
8840dee9 | 1142 | |
cdff08e7 SF |
1143 | spin_lock(&cifs_file_list_lock); |
1144 | ||
9b22b0b7 SF |
1145 | /* else we simply continue to the next entry. Thus |
1146 | we do not loop on reopen errors. If we | |
1147 | can not reopen the file, for example if we | |
1148 | reconnected to a server with another client | |
1149 | racing to delete or lock the file we would not | |
1150 | make progress if we restarted before the beginning | |
1151 | of the loop here. */ | |
6148a742 SF |
1152 | } |
1153 | } | |
2846d386 JL |
1154 | /* couldn't find useable FH with same pid, try any available */ |
1155 | if (!any_available) { | |
1156 | any_available = true; | |
1157 | goto refind_writable; | |
1158 | } | |
4477288a | 1159 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1160 | return NULL; |
1161 | } | |
1162 | ||
1da177e4 LT |
1163 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1164 | { | |
1165 | struct address_space *mapping = page->mapping; | |
1166 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1167 | char *write_data; | |
1168 | int rc = -EFAULT; | |
1169 | int bytes_written = 0; | |
1170 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1171 | struct inode *inode; |
6148a742 | 1172 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1173 | |
1174 | if (!mapping || !mapping->host) | |
1175 | return -EFAULT; | |
1176 | ||
1177 | inode = page->mapping->host; | |
1178 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1179 | |
1180 | offset += (loff_t)from; | |
1181 | write_data = kmap(page); | |
1182 | write_data += from; | |
1183 | ||
1184 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1185 | kunmap(page); | |
1186 | return -EIO; | |
1187 | } | |
1188 | ||
1189 | /* racing with truncate? */ | |
1190 | if (offset > mapping->host->i_size) { | |
1191 | kunmap(page); | |
1192 | return 0; /* don't care */ | |
1193 | } | |
1194 | ||
1195 | /* check to make sure that we are not extending the file */ | |
1196 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1197 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1198 | |
6508d904 | 1199 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1200 | if (open_file) { |
7da4b49a JL |
1201 | bytes_written = cifs_write(open_file, write_data, |
1202 | to - from, &offset); | |
6ab409b5 | 1203 | cifsFileInfo_put(open_file); |
1da177e4 | 1204 | /* Does mm or vfs already set times? */ |
6148a742 | 1205 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1206 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1207 | rc = 0; |
bb5a9a04 SF |
1208 | else if (bytes_written < 0) |
1209 | rc = bytes_written; | |
6148a742 | 1210 | } else { |
b6b38f70 | 1211 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1212 | rc = -EIO; |
1213 | } | |
1214 | ||
1215 | kunmap(page); | |
1216 | return rc; | |
1217 | } | |
1218 | ||
1da177e4 | 1219 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1220 | struct writeback_control *wbc) |
1da177e4 | 1221 | { |
37c0eb46 SF |
1222 | unsigned int bytes_to_write; |
1223 | unsigned int bytes_written; | |
1224 | struct cifs_sb_info *cifs_sb; | |
1225 | int done = 0; | |
111ebb6e | 1226 | pgoff_t end; |
37c0eb46 | 1227 | pgoff_t index; |
fb8c4b14 SF |
1228 | int range_whole = 0; |
1229 | struct kvec *iov; | |
84d2f07e | 1230 | int len; |
37c0eb46 SF |
1231 | int n_iov = 0; |
1232 | pgoff_t next; | |
1233 | int nr_pages; | |
1234 | __u64 offset = 0; | |
23e7dd7d | 1235 | struct cifsFileInfo *open_file; |
ba00ba64 | 1236 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1237 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1238 | struct page *page; |
1239 | struct pagevec pvec; | |
1240 | int rc = 0; | |
1241 | int scanned = 0; | |
fbec9ab9 | 1242 | int xid, long_op; |
1da177e4 | 1243 | |
37c0eb46 | 1244 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1245 | |
37c0eb46 SF |
1246 | /* |
1247 | * If wsize is smaller that the page cache size, default to writing | |
1248 | * one page at a time via cifs_writepage | |
1249 | */ | |
1250 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1251 | return generic_writepages(mapping, wbc); | |
1252 | ||
9a0c8230 | 1253 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1254 | if (iov == NULL) |
9a0c8230 SF |
1255 | return generic_writepages(mapping, wbc); |
1256 | ||
37c0eb46 | 1257 | /* |
f3983c21 JL |
1258 | * if there's no open file, then this is likely to fail too, |
1259 | * but it'll at least handle the return. Maybe it should be | |
1260 | * a BUG() instead? | |
37c0eb46 | 1261 | */ |
6508d904 | 1262 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1263 | if (!open_file) { |
9a0c8230 | 1264 | kfree(iov); |
f3983c21 JL |
1265 | return generic_writepages(mapping, wbc); |
1266 | } | |
1267 | ||
13cfb733 | 1268 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1269 | if (!experimEnabled && tcon->ses->server->secMode & |
1270 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1271 | cifsFileInfo_put(open_file); | |
6b035904 | 1272 | kfree(iov); |
f3983c21 | 1273 | return generic_writepages(mapping, wbc); |
37c0eb46 | 1274 | } |
f3983c21 | 1275 | cifsFileInfo_put(open_file); |
37c0eb46 | 1276 | |
1da177e4 LT |
1277 | xid = GetXid(); |
1278 | ||
37c0eb46 | 1279 | pagevec_init(&pvec, 0); |
111ebb6e | 1280 | if (wbc->range_cyclic) { |
37c0eb46 | 1281 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1282 | end = -1; |
1283 | } else { | |
1284 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1285 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1286 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1287 | range_whole = 1; | |
37c0eb46 SF |
1288 | scanned = 1; |
1289 | } | |
1290 | retry: | |
1291 | while (!done && (index <= end) && | |
1292 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1293 | PAGECACHE_TAG_DIRTY, | |
1294 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1295 | int first; | |
1296 | unsigned int i; | |
1297 | ||
37c0eb46 SF |
1298 | first = -1; |
1299 | next = 0; | |
1300 | n_iov = 0; | |
1301 | bytes_to_write = 0; | |
1302 | ||
1303 | for (i = 0; i < nr_pages; i++) { | |
1304 | page = pvec.pages[i]; | |
1305 | /* | |
1306 | * At this point we hold neither mapping->tree_lock nor | |
1307 | * lock on the page itself: the page may be truncated or | |
1308 | * invalidated (changing page->mapping to NULL), or even | |
1309 | * swizzled back from swapper_space to tmpfs file | |
1310 | * mapping | |
1311 | */ | |
1312 | ||
1313 | if (first < 0) | |
1314 | lock_page(page); | |
529ae9aa | 1315 | else if (!trylock_page(page)) |
37c0eb46 SF |
1316 | break; |
1317 | ||
1318 | if (unlikely(page->mapping != mapping)) { | |
1319 | unlock_page(page); | |
1320 | break; | |
1321 | } | |
1322 | ||
111ebb6e | 1323 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1324 | done = 1; |
1325 | unlock_page(page); | |
1326 | break; | |
1327 | } | |
1328 | ||
1329 | if (next && (page->index != next)) { | |
1330 | /* Not next consecutive page */ | |
1331 | unlock_page(page); | |
1332 | break; | |
1333 | } | |
1334 | ||
1335 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1336 | wait_on_page_writeback(page); | |
1337 | ||
1338 | if (PageWriteback(page) || | |
cb876f45 | 1339 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1340 | unlock_page(page); |
1341 | break; | |
1342 | } | |
84d2f07e | 1343 | |
cb876f45 LT |
1344 | /* |
1345 | * This actually clears the dirty bit in the radix tree. | |
1346 | * See cifs_writepage() for more commentary. | |
1347 | */ | |
1348 | set_page_writeback(page); | |
1349 | ||
84d2f07e SF |
1350 | if (page_offset(page) >= mapping->host->i_size) { |
1351 | done = 1; | |
1352 | unlock_page(page); | |
cb876f45 | 1353 | end_page_writeback(page); |
84d2f07e SF |
1354 | break; |
1355 | } | |
1356 | ||
37c0eb46 SF |
1357 | /* |
1358 | * BB can we get rid of this? pages are held by pvec | |
1359 | */ | |
1360 | page_cache_get(page); | |
1361 | ||
84d2f07e SF |
1362 | len = min(mapping->host->i_size - page_offset(page), |
1363 | (loff_t)PAGE_CACHE_SIZE); | |
1364 | ||
37c0eb46 SF |
1365 | /* reserve iov[0] for the smb header */ |
1366 | n_iov++; | |
1367 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1368 | iov[n_iov].iov_len = len; |
1369 | bytes_to_write += len; | |
37c0eb46 SF |
1370 | |
1371 | if (first < 0) { | |
1372 | first = i; | |
1373 | offset = page_offset(page); | |
1374 | } | |
1375 | next = page->index + 1; | |
1376 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1377 | break; | |
1378 | } | |
1379 | if (n_iov) { | |
6508d904 JL |
1380 | open_file = find_writable_file(CIFS_I(mapping->host), |
1381 | false); | |
23e7dd7d | 1382 | if (!open_file) { |
b6b38f70 | 1383 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1384 | rc = -EBADF; |
1047abc1 | 1385 | } else { |
fbec9ab9 | 1386 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1387 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1388 | bytes_to_write, offset, |
1389 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1390 | long_op); |
6ab409b5 | 1391 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1392 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1393 | } |
fbec9ab9 | 1394 | |
f3983c21 JL |
1395 | if (rc || bytes_written < bytes_to_write) { |
1396 | cERROR(1, "Write2 ret %d, wrote %d", | |
1397 | rc, bytes_written); | |
eb4b756b | 1398 | mapping_set_error(mapping, rc); |
f3983c21 JL |
1399 | } else { |
1400 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1401 | } |
f3983c21 | 1402 | |
37c0eb46 SF |
1403 | for (i = 0; i < n_iov; i++) { |
1404 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1405 | /* Should we also set page error on |
1406 | success rc but too little data written? */ | |
1407 | /* BB investigate retry logic on temporary | |
1408 | server crash cases and how recovery works | |
fb8c4b14 SF |
1409 | when page marked as error */ |
1410 | if (rc) | |
eb9bdaa3 | 1411 | SetPageError(page); |
37c0eb46 SF |
1412 | kunmap(page); |
1413 | unlock_page(page); | |
cb876f45 | 1414 | end_page_writeback(page); |
37c0eb46 SF |
1415 | page_cache_release(page); |
1416 | } | |
1417 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1418 | done = 1; | |
1419 | index = next; | |
b066a48c DK |
1420 | } else |
1421 | /* Need to re-find the pages we skipped */ | |
1422 | index = pvec.pages[0]->index + 1; | |
1423 | ||
37c0eb46 SF |
1424 | pagevec_release(&pvec); |
1425 | } | |
1426 | if (!scanned && !done) { | |
1427 | /* | |
1428 | * We hit the last page and there is more work to be done: wrap | |
1429 | * back to the start of the file | |
1430 | */ | |
1431 | scanned = 1; | |
1432 | index = 0; | |
1433 | goto retry; | |
1434 | } | |
111ebb6e | 1435 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1436 | mapping->writeback_index = index; |
1437 | ||
1da177e4 | 1438 | FreeXid(xid); |
9a0c8230 | 1439 | kfree(iov); |
1da177e4 LT |
1440 | return rc; |
1441 | } | |
1da177e4 | 1442 | |
fb8c4b14 | 1443 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1444 | { |
1445 | int rc = -EFAULT; | |
1446 | int xid; | |
1447 | ||
1448 | xid = GetXid(); | |
1449 | /* BB add check for wbc flags */ | |
1450 | page_cache_get(page); | |
ad7a2926 | 1451 | if (!PageUptodate(page)) |
b6b38f70 | 1452 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1453 | |
1454 | /* | |
1455 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1456 | * | |
1457 | * A writepage() implementation always needs to do either this, | |
1458 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1459 | * the case of a failure. | |
1460 | * | |
1461 | * Just unlocking the page will cause the radix tree tag-bits | |
1462 | * to fail to update with the state of the page correctly. | |
1463 | */ | |
fb8c4b14 | 1464 | set_page_writeback(page); |
1da177e4 LT |
1465 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1466 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1467 | unlock_page(page); | |
cb876f45 LT |
1468 | end_page_writeback(page); |
1469 | page_cache_release(page); | |
1da177e4 LT |
1470 | FreeXid(xid); |
1471 | return rc; | |
1472 | } | |
1473 | ||
d9414774 NP |
1474 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1475 | loff_t pos, unsigned len, unsigned copied, | |
1476 | struct page *page, void *fsdata) | |
1da177e4 | 1477 | { |
d9414774 NP |
1478 | int rc; |
1479 | struct inode *inode = mapping->host; | |
1da177e4 | 1480 | |
b6b38f70 JP |
1481 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1482 | page, pos, copied); | |
d9414774 | 1483 | |
a98ee8c1 JL |
1484 | if (PageChecked(page)) { |
1485 | if (copied == len) | |
1486 | SetPageUptodate(page); | |
1487 | ClearPageChecked(page); | |
1488 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1489 | SetPageUptodate(page); |
ad7a2926 | 1490 | |
1da177e4 | 1491 | if (!PageUptodate(page)) { |
d9414774 NP |
1492 | char *page_data; |
1493 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1494 | int xid; | |
1495 | ||
1496 | xid = GetXid(); | |
1da177e4 LT |
1497 | /* this is probably better than directly calling |
1498 | partialpage_write since in this function the file handle is | |
1499 | known which we might as well leverage */ | |
1500 | /* BB check if anything else missing out of ppw | |
1501 | such as updating last write time */ | |
1502 | page_data = kmap(page); | |
7da4b49a JL |
1503 | rc = cifs_write(file->private_data, page_data + offset, |
1504 | copied, &pos); | |
d9414774 | 1505 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1506 | kunmap(page); |
d9414774 NP |
1507 | |
1508 | FreeXid(xid); | |
fb8c4b14 | 1509 | } else { |
d9414774 NP |
1510 | rc = copied; |
1511 | pos += copied; | |
1da177e4 LT |
1512 | set_page_dirty(page); |
1513 | } | |
1514 | ||
d9414774 NP |
1515 | if (rc > 0) { |
1516 | spin_lock(&inode->i_lock); | |
1517 | if (pos > inode->i_size) | |
1518 | i_size_write(inode, pos); | |
1519 | spin_unlock(&inode->i_lock); | |
1520 | } | |
1521 | ||
1522 | unlock_page(page); | |
1523 | page_cache_release(page); | |
1524 | ||
1da177e4 LT |
1525 | return rc; |
1526 | } | |
1527 | ||
7ea80859 | 1528 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1529 | { |
1530 | int xid; | |
1531 | int rc = 0; | |
b298f223 | 1532 | struct cifsTconInfo *tcon; |
c21dfb69 | 1533 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1534 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1535 | |
1536 | xid = GetXid(); | |
1537 | ||
b6b38f70 | 1538 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1539 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1540 | |
cea21805 JL |
1541 | rc = filemap_write_and_wait(inode->i_mapping); |
1542 | if (rc == 0) { | |
eb4b756b JL |
1543 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1544 | ||
13cfb733 | 1545 | tcon = tlink_tcon(smbfile->tlink); |
eb4b756b | 1546 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1547 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1548 | } |
b298f223 | 1549 | |
1da177e4 LT |
1550 | FreeXid(xid); |
1551 | return rc; | |
1552 | } | |
1553 | ||
3978d717 | 1554 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1555 | { |
1556 | struct address_space *mapping; | |
1557 | struct inode *inode; | |
1558 | unsigned long index = page->index; | |
1559 | unsigned int rpages = 0; | |
1560 | int rc = 0; | |
1561 | ||
f19159dc | 1562 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1563 | mapping = page->mapping; |
1564 | if (!mapping) | |
1565 | return 0; | |
1566 | inode = mapping->host; | |
1567 | if (!inode) | |
3978d717 | 1568 | return; */ |
1da177e4 | 1569 | |
fb8c4b14 | 1570 | /* fill in rpages then |
1da177e4 LT |
1571 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1572 | ||
b6b38f70 | 1573 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1574 | |
3978d717 | 1575 | #if 0 |
1da177e4 LT |
1576 | if (rc < 0) |
1577 | return rc; | |
1578 | return 0; | |
3978d717 | 1579 | #endif |
1da177e4 LT |
1580 | } */ |
1581 | ||
1582 | /* | |
1583 | * As file closes, flush all cached write data for this inode checking | |
1584 | * for write behind errors. | |
1585 | */ | |
75e1fcc0 | 1586 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1587 | { |
fb8c4b14 | 1588 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1589 | int rc = 0; |
1590 | ||
eb4b756b | 1591 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1592 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1593 | |
b6b38f70 | 1594 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1595 | |
1596 | return rc; | |
1597 | } | |
1598 | ||
1599 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1600 | size_t read_size, loff_t *poffset) | |
1601 | { | |
1602 | int rc = -EACCES; | |
1603 | unsigned int bytes_read = 0; | |
1604 | unsigned int total_read = 0; | |
1605 | unsigned int current_read_size; | |
1606 | struct cifs_sb_info *cifs_sb; | |
1607 | struct cifsTconInfo *pTcon; | |
1608 | int xid; | |
1609 | struct cifsFileInfo *open_file; | |
1610 | char *smb_read_data; | |
1611 | char __user *current_offset; | |
1612 | struct smb_com_read_rsp *pSMBr; | |
1613 | ||
1614 | xid = GetXid(); | |
e6a00296 | 1615 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1616 | |
1617 | if (file->private_data == NULL) { | |
0f3bc09e | 1618 | rc = -EBADF; |
1da177e4 | 1619 | FreeXid(xid); |
0f3bc09e | 1620 | return rc; |
1da177e4 | 1621 | } |
c21dfb69 | 1622 | open_file = file->private_data; |
13cfb733 | 1623 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1624 | |
ad7a2926 | 1625 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1626 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1627 | |
1da177e4 LT |
1628 | for (total_read = 0, current_offset = read_data; |
1629 | read_size > total_read; | |
1630 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1631 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1632 | cifs_sb->rsize); |
1633 | rc = -EAGAIN; | |
1634 | smb_read_data = NULL; | |
1635 | while (rc == -EAGAIN) { | |
ec637e3f | 1636 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1637 | if (open_file->invalidHandle) { |
15886177 | 1638 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1639 | if (rc != 0) |
1640 | break; | |
1641 | } | |
bfa0d75a | 1642 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1643 | open_file->netfid, |
1644 | current_read_size, *poffset, | |
1645 | &bytes_read, &smb_read_data, | |
1646 | &buf_type); | |
1da177e4 | 1647 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1648 | if (smb_read_data) { |
93544cc6 SF |
1649 | if (copy_to_user(current_offset, |
1650 | smb_read_data + | |
1651 | 4 /* RFC1001 length field */ + | |
1652 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1653 | bytes_read)) |
93544cc6 | 1654 | rc = -EFAULT; |
93544cc6 | 1655 | |
fb8c4b14 | 1656 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1657 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1658 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1659 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1660 | smb_read_data = NULL; |
1661 | } | |
1662 | } | |
1663 | if (rc || (bytes_read == 0)) { | |
1664 | if (total_read) { | |
1665 | break; | |
1666 | } else { | |
1667 | FreeXid(xid); | |
1668 | return rc; | |
1669 | } | |
1670 | } else { | |
a4544347 | 1671 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1672 | *poffset += bytes_read; |
1673 | } | |
1674 | } | |
1675 | FreeXid(xid); | |
1676 | return total_read; | |
1677 | } | |
1678 | ||
1679 | ||
1680 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1681 | loff_t *poffset) | |
1682 | { | |
1683 | int rc = -EACCES; | |
1684 | unsigned int bytes_read = 0; | |
1685 | unsigned int total_read; | |
1686 | unsigned int current_read_size; | |
1687 | struct cifs_sb_info *cifs_sb; | |
1688 | struct cifsTconInfo *pTcon; | |
1689 | int xid; | |
1690 | char *current_offset; | |
1691 | struct cifsFileInfo *open_file; | |
ec637e3f | 1692 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1693 | |
1694 | xid = GetXid(); | |
e6a00296 | 1695 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1696 | |
1697 | if (file->private_data == NULL) { | |
0f3bc09e | 1698 | rc = -EBADF; |
1da177e4 | 1699 | FreeXid(xid); |
0f3bc09e | 1700 | return rc; |
1da177e4 | 1701 | } |
c21dfb69 | 1702 | open_file = file->private_data; |
13cfb733 | 1703 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1704 | |
1705 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1706 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1707 | |
fb8c4b14 | 1708 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1709 | read_size > total_read; |
1710 | total_read += bytes_read, current_offset += bytes_read) { | |
1711 | current_read_size = min_t(const int, read_size - total_read, | |
1712 | cifs_sb->rsize); | |
f9f5c817 SF |
1713 | /* For windows me and 9x we do not want to request more |
1714 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1715 | if ((pTcon->ses) && |
f9f5c817 SF |
1716 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1717 | current_read_size = min_t(const int, current_read_size, | |
1718 | pTcon->ses->server->maxBuf - 128); | |
1719 | } | |
1da177e4 LT |
1720 | rc = -EAGAIN; |
1721 | while (rc == -EAGAIN) { | |
cdff08e7 | 1722 | if (open_file->invalidHandle) { |
15886177 | 1723 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1724 | if (rc != 0) |
1725 | break; | |
1726 | } | |
bfa0d75a | 1727 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1728 | open_file->netfid, |
1729 | current_read_size, *poffset, | |
1730 | &bytes_read, ¤t_offset, | |
1731 | &buf_type); | |
1da177e4 LT |
1732 | } |
1733 | if (rc || (bytes_read == 0)) { | |
1734 | if (total_read) { | |
1735 | break; | |
1736 | } else { | |
1737 | FreeXid(xid); | |
1738 | return rc; | |
1739 | } | |
1740 | } else { | |
a4544347 | 1741 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1742 | *poffset += bytes_read; |
1743 | } | |
1744 | } | |
1745 | FreeXid(xid); | |
1746 | return total_read; | |
1747 | } | |
1748 | ||
1749 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1750 | { | |
1da177e4 LT |
1751 | int rc, xid; |
1752 | ||
1753 | xid = GetXid(); | |
abab095d | 1754 | rc = cifs_revalidate_file(file); |
1da177e4 | 1755 | if (rc) { |
b6b38f70 | 1756 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1757 | FreeXid(xid); |
1758 | return rc; | |
1759 | } | |
1760 | rc = generic_file_mmap(file, vma); | |
1761 | FreeXid(xid); | |
1762 | return rc; | |
1763 | } | |
1764 | ||
1765 | ||
fb8c4b14 | 1766 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1767 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1768 | { |
1769 | struct page *page; | |
1770 | char *target; | |
1771 | ||
1772 | while (bytes_read > 0) { | |
1773 | if (list_empty(pages)) | |
1774 | break; | |
1775 | ||
1776 | page = list_entry(pages->prev, struct page, lru); | |
1777 | list_del(&page->lru); | |
1778 | ||
315e995c | 1779 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1780 | GFP_KERNEL)) { |
1781 | page_cache_release(page); | |
b6b38f70 | 1782 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1783 | data += PAGE_CACHE_SIZE; |
1784 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1785 | continue; |
1786 | } | |
06b43672 | 1787 | page_cache_release(page); |
1da177e4 | 1788 | |
fb8c4b14 | 1789 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1790 | |
1791 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1792 | memcpy(target, data, bytes_read); | |
1793 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1794 | memset(target + bytes_read, 0, |
1da177e4 LT |
1795 | PAGE_CACHE_SIZE - bytes_read); |
1796 | bytes_read = 0; | |
1797 | } else { | |
1798 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1799 | bytes_read -= PAGE_CACHE_SIZE; | |
1800 | } | |
1801 | kunmap_atomic(target, KM_USER0); | |
1802 | ||
1803 | flush_dcache_page(page); | |
1804 | SetPageUptodate(page); | |
1805 | unlock_page(page); | |
1da177e4 | 1806 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1807 | |
1808 | /* add page to FS-Cache */ | |
1809 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1810 | } |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1815 | struct list_head *page_list, unsigned num_pages) | |
1816 | { | |
1817 | int rc = -EACCES; | |
1818 | int xid; | |
1819 | loff_t offset; | |
1820 | struct page *page; | |
1821 | struct cifs_sb_info *cifs_sb; | |
1822 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1823 | unsigned int bytes_read = 0; |
fb8c4b14 | 1824 | unsigned int read_size, i; |
1da177e4 LT |
1825 | char *smb_read_data = NULL; |
1826 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1827 | struct cifsFileInfo *open_file; |
ec637e3f | 1828 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1829 | |
1830 | xid = GetXid(); | |
1831 | if (file->private_data == NULL) { | |
0f3bc09e | 1832 | rc = -EBADF; |
1da177e4 | 1833 | FreeXid(xid); |
0f3bc09e | 1834 | return rc; |
1da177e4 | 1835 | } |
c21dfb69 | 1836 | open_file = file->private_data; |
e6a00296 | 1837 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1838 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1839 | |
56698236 SJ |
1840 | /* |
1841 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1842 | * immediately if the cookie is negative | |
1843 | */ | |
1844 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1845 | &num_pages); | |
1846 | if (rc == 0) | |
1847 | goto read_complete; | |
1848 | ||
f19159dc | 1849 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1850 | for (i = 0; i < num_pages; ) { |
1851 | unsigned contig_pages; | |
1852 | struct page *tmp_page; | |
1853 | unsigned long expected_index; | |
1854 | ||
1855 | if (list_empty(page_list)) | |
1856 | break; | |
1857 | ||
1858 | page = list_entry(page_list->prev, struct page, lru); | |
1859 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1860 | ||
1861 | /* count adjacent pages that we will read into */ | |
1862 | contig_pages = 0; | |
fb8c4b14 | 1863 | expected_index = |
1da177e4 | 1864 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1865 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1866 | if (tmp_page->index == expected_index) { |
1867 | contig_pages++; | |
1868 | expected_index++; | |
1869 | } else | |
fb8c4b14 | 1870 | break; |
1da177e4 LT |
1871 | } |
1872 | if (contig_pages + i > num_pages) | |
1873 | contig_pages = num_pages - i; | |
1874 | ||
1875 | /* for reads over a certain size could initiate async | |
1876 | read ahead */ | |
1877 | ||
1878 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1879 | /* Read size needs to be in multiples of one page */ | |
1880 | read_size = min_t(const unsigned int, read_size, | |
1881 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
1882 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
1883 | read_size, contig_pages); | |
1da177e4 LT |
1884 | rc = -EAGAIN; |
1885 | while (rc == -EAGAIN) { | |
cdff08e7 | 1886 | if (open_file->invalidHandle) { |
15886177 | 1887 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1888 | if (rc != 0) |
1889 | break; | |
1890 | } | |
1891 | ||
bfa0d75a | 1892 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1893 | open_file->netfid, |
1894 | read_size, offset, | |
1895 | &bytes_read, &smb_read_data, | |
1896 | &buf_type); | |
a9d02ad4 | 1897 | /* BB more RC checks ? */ |
fb8c4b14 | 1898 | if (rc == -EAGAIN) { |
1da177e4 | 1899 | if (smb_read_data) { |
fb8c4b14 | 1900 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1901 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1902 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1903 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1904 | smb_read_data = NULL; |
1905 | } | |
1906 | } | |
1907 | } | |
1908 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 1909 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
1910 | break; |
1911 | } else if (bytes_read > 0) { | |
6f88cc2e | 1912 | task_io_account_read(bytes_read); |
1da177e4 LT |
1913 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1914 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1915 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 1916 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
1917 | |
1918 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1919 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1920 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1921 | i++; /* account for partial page */ |
1922 | ||
fb8c4b14 | 1923 | /* server copy of file can have smaller size |
1da177e4 | 1924 | than client */ |
fb8c4b14 SF |
1925 | /* BB do we need to verify this common case ? |
1926 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1927 | we will hit it on next read */ |
1928 | ||
05ac9d4b | 1929 | /* break; */ |
1da177e4 LT |
1930 | } |
1931 | } else { | |
b6b38f70 | 1932 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 1933 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 1934 | bytes_read, offset); |
fb8c4b14 | 1935 | /* BB turn off caching and do new lookup on |
1da177e4 | 1936 | file size at server? */ |
1da177e4 LT |
1937 | break; |
1938 | } | |
1939 | if (smb_read_data) { | |
fb8c4b14 | 1940 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1941 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1942 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1943 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1944 | smb_read_data = NULL; |
1945 | } | |
1946 | bytes_read = 0; | |
1947 | } | |
1948 | ||
1da177e4 LT |
1949 | /* need to free smb_read_data buf before exit */ |
1950 | if (smb_read_data) { | |
fb8c4b14 | 1951 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1952 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1953 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1954 | cifs_buf_release(smb_read_data); |
1da177e4 | 1955 | smb_read_data = NULL; |
fb8c4b14 | 1956 | } |
1da177e4 | 1957 | |
56698236 | 1958 | read_complete: |
1da177e4 LT |
1959 | FreeXid(xid); |
1960 | return rc; | |
1961 | } | |
1962 | ||
1963 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
1964 | loff_t *poffset) | |
1965 | { | |
1966 | char *read_data; | |
1967 | int rc; | |
1968 | ||
56698236 SJ |
1969 | /* Is the page cached? */ |
1970 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
1971 | if (rc == 0) | |
1972 | goto read_complete; | |
1973 | ||
1da177e4 LT |
1974 | page_cache_get(page); |
1975 | read_data = kmap(page); | |
1976 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 1977 | |
1da177e4 | 1978 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 1979 | |
1da177e4 LT |
1980 | if (rc < 0) |
1981 | goto io_error; | |
1982 | else | |
b6b38f70 | 1983 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 1984 | |
e6a00296 JJS |
1985 | file->f_path.dentry->d_inode->i_atime = |
1986 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 1987 | |
1da177e4 LT |
1988 | if (PAGE_CACHE_SIZE > rc) |
1989 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
1990 | ||
1991 | flush_dcache_page(page); | |
1992 | SetPageUptodate(page); | |
9dc06558 SJ |
1993 | |
1994 | /* send this page to the cache */ | |
1995 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
1996 | ||
1da177e4 | 1997 | rc = 0; |
fb8c4b14 | 1998 | |
1da177e4 | 1999 | io_error: |
fb8c4b14 | 2000 | kunmap(page); |
1da177e4 | 2001 | page_cache_release(page); |
56698236 SJ |
2002 | |
2003 | read_complete: | |
1da177e4 LT |
2004 | return rc; |
2005 | } | |
2006 | ||
2007 | static int cifs_readpage(struct file *file, struct page *page) | |
2008 | { | |
2009 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2010 | int rc = -EACCES; | |
2011 | int xid; | |
2012 | ||
2013 | xid = GetXid(); | |
2014 | ||
2015 | if (file->private_data == NULL) { | |
0f3bc09e | 2016 | rc = -EBADF; |
1da177e4 | 2017 | FreeXid(xid); |
0f3bc09e | 2018 | return rc; |
1da177e4 LT |
2019 | } |
2020 | ||
b6b38f70 JP |
2021 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2022 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2023 | |
2024 | rc = cifs_readpage_worker(file, page, &offset); | |
2025 | ||
2026 | unlock_page(page); | |
2027 | ||
2028 | FreeXid(xid); | |
2029 | return rc; | |
2030 | } | |
2031 | ||
a403a0a3 SF |
2032 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2033 | { | |
2034 | struct cifsFileInfo *open_file; | |
2035 | ||
4477288a | 2036 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2037 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2038 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2039 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2040 | return 1; |
2041 | } | |
2042 | } | |
4477288a | 2043 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2044 | return 0; |
2045 | } | |
2046 | ||
1da177e4 LT |
2047 | /* We do not want to update the file size from server for inodes |
2048 | open for write - to avoid races with writepage extending | |
2049 | the file - in the future we could consider allowing | |
fb8c4b14 | 2050 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2051 | but this is tricky to do without racing with writebehind |
2052 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2053 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2054 | { |
a403a0a3 | 2055 | if (!cifsInode) |
4b18f2a9 | 2056 | return true; |
50c2f753 | 2057 | |
a403a0a3 SF |
2058 | if (is_inode_writable(cifsInode)) { |
2059 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2060 | struct cifs_sb_info *cifs_sb; |
2061 | ||
c32a0b68 | 2062 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2063 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2064 | /* since no page cache to corrupt on directio |
c32a0b68 | 2065 | we can change size safely */ |
4b18f2a9 | 2066 | return true; |
c32a0b68 SF |
2067 | } |
2068 | ||
fb8c4b14 | 2069 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2070 | return true; |
7ba52631 | 2071 | |
4b18f2a9 | 2072 | return false; |
23e7dd7d | 2073 | } else |
4b18f2a9 | 2074 | return true; |
1da177e4 LT |
2075 | } |
2076 | ||
d9414774 NP |
2077 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2078 | loff_t pos, unsigned len, unsigned flags, | |
2079 | struct page **pagep, void **fsdata) | |
1da177e4 | 2080 | { |
d9414774 NP |
2081 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2082 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2083 | loff_t page_start = pos & PAGE_MASK; |
2084 | loff_t i_size; | |
2085 | struct page *page; | |
2086 | int rc = 0; | |
d9414774 | 2087 | |
b6b38f70 | 2088 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2089 | |
54566b2c | 2090 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2091 | if (!page) { |
2092 | rc = -ENOMEM; | |
2093 | goto out; | |
2094 | } | |
8a236264 | 2095 | |
a98ee8c1 JL |
2096 | if (PageUptodate(page)) |
2097 | goto out; | |
8a236264 | 2098 | |
a98ee8c1 JL |
2099 | /* |
2100 | * If we write a full page it will be up to date, no need to read from | |
2101 | * the server. If the write is short, we'll end up doing a sync write | |
2102 | * instead. | |
2103 | */ | |
2104 | if (len == PAGE_CACHE_SIZE) | |
2105 | goto out; | |
8a236264 | 2106 | |
a98ee8c1 JL |
2107 | /* |
2108 | * optimize away the read when we have an oplock, and we're not | |
2109 | * expecting to use any of the data we'd be reading in. That | |
2110 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2111 | * and the write will cover all of the existing data. | |
2112 | */ | |
2113 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2114 | i_size = i_size_read(mapping->host); | |
2115 | if (page_start >= i_size || | |
2116 | (offset == 0 && (pos + len) >= i_size)) { | |
2117 | zero_user_segments(page, 0, offset, | |
2118 | offset + len, | |
2119 | PAGE_CACHE_SIZE); | |
2120 | /* | |
2121 | * PageChecked means that the parts of the page | |
2122 | * to which we're not writing are considered up | |
2123 | * to date. Once the data is copied to the | |
2124 | * page, it can be set uptodate. | |
2125 | */ | |
2126 | SetPageChecked(page); | |
2127 | goto out; | |
2128 | } | |
2129 | } | |
d9414774 | 2130 | |
a98ee8c1 JL |
2131 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2132 | /* | |
2133 | * might as well read a page, it is fast enough. If we get | |
2134 | * an error, we don't need to return it. cifs_write_end will | |
2135 | * do a sync write instead since PG_uptodate isn't set. | |
2136 | */ | |
2137 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2138 | } else { |
2139 | /* we could try using another file handle if there is one - | |
2140 | but how would we lock it to prevent close of that handle | |
2141 | racing with this read? In any case | |
d9414774 | 2142 | this will be written out by write_end so is fine */ |
1da177e4 | 2143 | } |
a98ee8c1 JL |
2144 | out: |
2145 | *pagep = page; | |
2146 | return rc; | |
1da177e4 LT |
2147 | } |
2148 | ||
85f2d6b4 SJ |
2149 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2150 | { | |
2151 | if (PagePrivate(page)) | |
2152 | return 0; | |
2153 | ||
2154 | return cifs_fscache_release_page(page, gfp); | |
2155 | } | |
2156 | ||
2157 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2158 | { | |
2159 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2160 | ||
2161 | if (offset == 0) | |
2162 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2163 | } | |
2164 | ||
9b646972 | 2165 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2166 | { |
2167 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2168 | oplock_break); | |
a5e18bc3 | 2169 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2170 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2171 | int rc = 0; |
3bc303c2 JL |
2172 | |
2173 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2174 | if (cinode->clientCanCacheRead) |
8737c930 | 2175 | break_lease(inode, O_RDONLY); |
d54ff732 | 2176 | else |
8737c930 | 2177 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2178 | rc = filemap_fdatawrite(inode->i_mapping); |
2179 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2180 | rc = filemap_fdatawait(inode->i_mapping); |
2181 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2182 | invalidate_remote_inode(inode); |
2183 | } | |
b6b38f70 | 2184 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2185 | } |
2186 | ||
2187 | /* | |
2188 | * releasing stale oplock after recent reconnect of smb session using | |
2189 | * a now incorrect file handle is not a data integrity issue but do | |
2190 | * not bother sending an oplock release if session to server still is | |
2191 | * disconnected since oplock already released by the server | |
2192 | */ | |
cdff08e7 | 2193 | if (!cfile->oplock_break_cancelled) { |
13cfb733 JL |
2194 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2195 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2196 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2197 | } |
9b646972 TH |
2198 | |
2199 | /* | |
2200 | * We might have kicked in before is_valid_oplock_break() | |
2201 | * finished grabbing reference for us. Make sure it's done by | |
6573e9b7 | 2202 | * waiting for cifs_file_list_lock. |
9b646972 | 2203 | */ |
4477288a JL |
2204 | spin_lock(&cifs_file_list_lock); |
2205 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2206 | |
2207 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2208 | } |
2209 | ||
5f6dbc9e | 2210 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2211 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2212 | { |
d7c86ff8 | 2213 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2214 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2215 | } |
2216 | ||
9b646972 | 2217 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2218 | { |
ebe2e91e JL |
2219 | struct super_block *sb = cfile->dentry->d_sb; |
2220 | ||
3bc303c2 | 2221 | cifsFileInfo_put(cfile); |
ebe2e91e | 2222 | cifs_sb_deactive(sb); |
3bc303c2 JL |
2223 | } |
2224 | ||
f5e54d6e | 2225 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2226 | .readpage = cifs_readpage, |
2227 | .readpages = cifs_readpages, | |
2228 | .writepage = cifs_writepage, | |
37c0eb46 | 2229 | .writepages = cifs_writepages, |
d9414774 NP |
2230 | .write_begin = cifs_write_begin, |
2231 | .write_end = cifs_write_end, | |
1da177e4 | 2232 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2233 | .releasepage = cifs_release_page, |
2234 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2235 | /* .sync_page = cifs_sync_page, */ |
2236 | /* .direct_IO = */ | |
2237 | }; | |
273d81d6 DK |
2238 | |
2239 | /* | |
2240 | * cifs_readpages requires the server to support a buffer large enough to | |
2241 | * contain the header plus one complete page of data. Otherwise, we need | |
2242 | * to leave cifs_readpages out of the address space operations. | |
2243 | */ | |
f5e54d6e | 2244 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2245 | .readpage = cifs_readpage, |
2246 | .writepage = cifs_writepage, | |
2247 | .writepages = cifs_writepages, | |
d9414774 NP |
2248 | .write_begin = cifs_write_begin, |
2249 | .write_end = cifs_write_end, | |
273d81d6 | 2250 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2251 | .releasepage = cifs_release_page, |
2252 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2253 | /* .sync_page = cifs_sync_page, */ |
2254 | /* .direct_IO = */ | |
2255 | }; |