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> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
07b92d0d | 46 | |
1da177e4 LT |
47 | static inline int cifs_convert_flags(unsigned int flags) |
48 | { | |
49 | if ((flags & O_ACCMODE) == O_RDONLY) | |
50 | return GENERIC_READ; | |
51 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
52 | return GENERIC_WRITE; | |
53 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
54 | /* GENERIC_ALL is too much permission to request | |
55 | can cause unnecessary access denied on create */ | |
56 | /* return GENERIC_ALL; */ | |
57 | return (GENERIC_READ | GENERIC_WRITE); | |
58 | } | |
59 | ||
e10f7b55 JL |
60 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
61 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
62 | FILE_READ_DATA); | |
7fc8f4e9 | 63 | } |
e10f7b55 | 64 | |
608712fe | 65 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 66 | { |
608712fe | 67 | u32 posix_flags = 0; |
e10f7b55 | 68 | |
7fc8f4e9 | 69 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 70 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 71 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
72 | posix_flags = SMB_O_WRONLY; |
73 | else if ((flags & O_ACCMODE) == O_RDWR) | |
74 | posix_flags = SMB_O_RDWR; | |
75 | ||
07b92d0d | 76 | if (flags & O_CREAT) { |
608712fe | 77 | posix_flags |= SMB_O_CREAT; |
07b92d0d SF |
78 | if (flags & O_EXCL) |
79 | posix_flags |= SMB_O_EXCL; | |
80 | } else if (flags & O_EXCL) | |
f96637be JP |
81 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
82 | current->comm, current->tgid); | |
07b92d0d | 83 | |
608712fe JL |
84 | if (flags & O_TRUNC) |
85 | posix_flags |= SMB_O_TRUNC; | |
86 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 87 | if (flags & O_DSYNC) |
608712fe | 88 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 89 | if (flags & O_DIRECTORY) |
608712fe | 90 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 91 | if (flags & O_NOFOLLOW) |
608712fe | 92 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 93 | if (flags & O_DIRECT) |
608712fe | 94 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
95 | |
96 | return posix_flags; | |
1da177e4 LT |
97 | } |
98 | ||
99 | static inline int cifs_get_disposition(unsigned int flags) | |
100 | { | |
101 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
102 | return FILE_CREATE; | |
103 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
104 | return FILE_OVERWRITE_IF; | |
105 | else if ((flags & O_CREAT) == O_CREAT) | |
106 | return FILE_OPEN_IF; | |
55aa2e09 SF |
107 | else if ((flags & O_TRUNC) == O_TRUNC) |
108 | return FILE_OVERWRITE; | |
1da177e4 LT |
109 | else |
110 | return FILE_OPEN; | |
111 | } | |
112 | ||
608712fe JL |
113 | int cifs_posix_open(char *full_path, struct inode **pinode, |
114 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 115 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
116 | { |
117 | int rc; | |
118 | FILE_UNIX_BASIC_INFO *presp_data; | |
119 | __u32 posix_flags = 0; | |
120 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
121 | struct cifs_fattr fattr; | |
122 | struct tcon_link *tlink; | |
96daf2b0 | 123 | struct cifs_tcon *tcon; |
608712fe | 124 | |
f96637be | 125 | cifs_dbg(FYI, "posix open %s\n", full_path); |
608712fe JL |
126 | |
127 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
128 | if (presp_data == NULL) | |
129 | return -ENOMEM; | |
130 | ||
131 | tlink = cifs_sb_tlink(cifs_sb); | |
132 | if (IS_ERR(tlink)) { | |
133 | rc = PTR_ERR(tlink); | |
134 | goto posix_open_ret; | |
135 | } | |
136 | ||
137 | tcon = tlink_tcon(tlink); | |
138 | mode &= ~current_umask(); | |
139 | ||
140 | posix_flags = cifs_posix_convert_flags(f_flags); | |
141 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
142 | poplock, full_path, cifs_sb->local_nls, | |
143 | cifs_sb->mnt_cifs_flags & | |
144 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
145 | cifs_put_tlink(tlink); | |
146 | ||
147 | if (rc) | |
148 | goto posix_open_ret; | |
149 | ||
150 | if (presp_data->Type == cpu_to_le32(-1)) | |
151 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
152 | ||
153 | if (!pinode) | |
154 | goto posix_open_ret; /* caller does not need info */ | |
155 | ||
156 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
157 | ||
158 | /* get new inode and set it up */ | |
159 | if (*pinode == NULL) { | |
160 | cifs_fill_uniqueid(sb, &fattr); | |
161 | *pinode = cifs_iget(sb, &fattr); | |
162 | if (!*pinode) { | |
163 | rc = -ENOMEM; | |
164 | goto posix_open_ret; | |
165 | } | |
166 | } else { | |
167 | cifs_fattr_to_inode(*pinode, &fattr); | |
168 | } | |
169 | ||
170 | posix_open_ret: | |
171 | kfree(presp_data); | |
172 | return rc; | |
173 | } | |
174 | ||
eeb910a6 PS |
175 | static int |
176 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
177 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
178 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
179 | { |
180 | int rc; | |
fb1214e4 | 181 | int desired_access; |
eeb910a6 | 182 | int disposition; |
3d3ea8e6 | 183 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 184 | FILE_ALL_INFO *buf; |
b8c32dbb | 185 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 186 | struct cifs_open_parms oparms; |
eeb910a6 | 187 | |
b8c32dbb | 188 | if (!server->ops->open) |
fb1214e4 PS |
189 | return -ENOSYS; |
190 | ||
191 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
192 | |
193 | /********************************************************************* | |
194 | * open flag mapping table: | |
195 | * | |
196 | * POSIX Flag CIFS Disposition | |
197 | * ---------- ---------------- | |
198 | * O_CREAT FILE_OPEN_IF | |
199 | * O_CREAT | O_EXCL FILE_CREATE | |
200 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
201 | * O_TRUNC FILE_OVERWRITE | |
202 | * none of the above FILE_OPEN | |
203 | * | |
204 | * Note that there is not a direct match between disposition | |
205 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
206 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
207 | * file rather than creating a new file as FILE_SUPERSEDE does | |
208 | * (which uses the attributes / metadata passed in on open call) | |
209 | *? | |
210 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
211 | *? and the read write flags match reasonably. O_LARGEFILE | |
212 | *? is irrelevant because largefile support is always used | |
213 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
214 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
215 | *********************************************************************/ | |
216 | ||
217 | disposition = cifs_get_disposition(f_flags); | |
218 | ||
219 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
220 | ||
221 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
222 | if (!buf) | |
223 | return -ENOMEM; | |
224 | ||
3d3ea8e6 SP |
225 | if (backup_cred(cifs_sb)) |
226 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
227 | ||
226730b4 PS |
228 | oparms.tcon = tcon; |
229 | oparms.cifs_sb = cifs_sb; | |
230 | oparms.desired_access = desired_access; | |
231 | oparms.create_options = create_options; | |
232 | oparms.disposition = disposition; | |
233 | oparms.path = full_path; | |
234 | oparms.fid = fid; | |
9cbc0b73 | 235 | oparms.reconnect = false; |
226730b4 PS |
236 | |
237 | rc = server->ops->open(xid, &oparms, oplock, buf); | |
eeb910a6 PS |
238 | |
239 | if (rc) | |
240 | goto out; | |
241 | ||
242 | if (tcon->unix_ext) | |
243 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
244 | xid); | |
245 | else | |
246 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
42eacf9e | 247 | xid, fid); |
eeb910a6 PS |
248 | |
249 | out: | |
250 | kfree(buf); | |
251 | return rc; | |
252 | } | |
253 | ||
63b7d3a4 PS |
254 | static bool |
255 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
256 | { | |
257 | struct cifs_fid_locks *cur; | |
258 | bool has_locks = false; | |
259 | ||
260 | down_read(&cinode->lock_sem); | |
261 | list_for_each_entry(cur, &cinode->llist, llist) { | |
262 | if (!list_empty(&cur->locks)) { | |
263 | has_locks = true; | |
264 | break; | |
265 | } | |
266 | } | |
267 | up_read(&cinode->lock_sem); | |
268 | return has_locks; | |
269 | } | |
270 | ||
15ecb436 | 271 | struct cifsFileInfo * |
fb1214e4 | 272 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
273 | struct tcon_link *tlink, __u32 oplock) |
274 | { | |
275 | struct dentry *dentry = file->f_path.dentry; | |
276 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
277 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
278 | struct cifsFileInfo *cfile; | |
f45d3416 | 279 | struct cifs_fid_locks *fdlocks; |
233839b1 | 280 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 281 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
282 | |
283 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
284 | if (cfile == NULL) | |
285 | return cfile; | |
286 | ||
f45d3416 PS |
287 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
288 | if (!fdlocks) { | |
289 | kfree(cfile); | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | INIT_LIST_HEAD(&fdlocks->locks); | |
294 | fdlocks->cfile = cfile; | |
295 | cfile->llist = fdlocks; | |
1b4b55a1 | 296 | down_write(&cinode->lock_sem); |
f45d3416 | 297 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 298 | up_write(&cinode->lock_sem); |
f45d3416 | 299 | |
4b4de76e | 300 | cfile->count = 1; |
4b4de76e PS |
301 | cfile->pid = current->tgid; |
302 | cfile->uid = current_fsuid(); | |
303 | cfile->dentry = dget(dentry); | |
304 | cfile->f_flags = file->f_flags; | |
305 | cfile->invalidHandle = false; | |
306 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 307 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 308 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 309 | |
24261fc2 MG |
310 | cifs_sb_active(inode->i_sb); |
311 | ||
63b7d3a4 PS |
312 | /* |
313 | * If the server returned a read oplock and we have mandatory brlocks, | |
314 | * set oplock level to None. | |
315 | */ | |
53ef1016 | 316 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
f96637be | 317 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
318 | oplock = 0; |
319 | } | |
320 | ||
4477288a | 321 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 322 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
323 | oplock = fid->pending_open->oplock; |
324 | list_del(&fid->pending_open->olist); | |
325 | ||
42873b0a | 326 | fid->purge_cache = false; |
63b7d3a4 | 327 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
328 | |
329 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
330 | /* if readable file instance put first in list*/ |
331 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 332 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 333 | else |
4b4de76e | 334 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 335 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 336 | |
42873b0a | 337 | if (fid->purge_cache) |
4f73c7d3 | 338 | cifs_zap_mapping(inode); |
42873b0a | 339 | |
4b4de76e PS |
340 | file->private_data = cfile; |
341 | return cfile; | |
15ecb436 JL |
342 | } |
343 | ||
764a1b1a JL |
344 | struct cifsFileInfo * |
345 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
346 | { | |
347 | spin_lock(&cifs_file_list_lock); | |
348 | cifsFileInfo_get_locked(cifs_file); | |
349 | spin_unlock(&cifs_file_list_lock); | |
350 | return cifs_file; | |
351 | } | |
352 | ||
cdff08e7 SF |
353 | /* |
354 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
355 | * the filehandle out on the server. Must be called without holding |
356 | * cifs_file_list_lock. | |
cdff08e7 | 357 | */ |
b33879aa JL |
358 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
359 | { | |
e66673e3 | 360 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 361 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 362 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 363 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
364 | struct super_block *sb = inode->i_sb; |
365 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 366 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
367 | struct cifs_fid fid; |
368 | struct cifs_pending_open open; | |
cdff08e7 SF |
369 | |
370 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 371 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
372 | spin_unlock(&cifs_file_list_lock); |
373 | return; | |
374 | } | |
375 | ||
233839b1 PS |
376 | if (server->ops->get_lease_key) |
377 | server->ops->get_lease_key(inode, &fid); | |
378 | ||
379 | /* store open in pending opens to make sure we don't miss lease break */ | |
380 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
381 | ||
cdff08e7 SF |
382 | /* remove it from the lists */ |
383 | list_del(&cifs_file->flist); | |
384 | list_del(&cifs_file->tlist); | |
385 | ||
386 | if (list_empty(&cifsi->openFileList)) { | |
f96637be JP |
387 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
388 | cifs_file->dentry->d_inode); | |
25364138 PS |
389 | /* |
390 | * In strict cache mode we need invalidate mapping on the last | |
391 | * close because it may cause a error when we open this file | |
392 | * again and get at least level II oplock. | |
393 | */ | |
4f8ba8a0 | 394 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
aff8d5ca | 395 | set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); |
c6723628 | 396 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
397 | } |
398 | spin_unlock(&cifs_file_list_lock); | |
399 | ||
ad635942 JL |
400 | cancel_work_sync(&cifs_file->oplock_break); |
401 | ||
cdff08e7 | 402 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 403 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 404 | unsigned int xid; |
0ff78a22 | 405 | |
6d5786a3 | 406 | xid = get_xid(); |
0ff78a22 | 407 | if (server->ops->close) |
760ad0ca PS |
408 | server->ops->close(xid, tcon, &cifs_file->fid); |
409 | _free_xid(xid); | |
cdff08e7 SF |
410 | } |
411 | ||
233839b1 PS |
412 | cifs_del_pending_open(&open); |
413 | ||
f45d3416 PS |
414 | /* |
415 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
416 | * is closed anyway. |
417 | */ | |
1b4b55a1 | 418 | down_write(&cifsi->lock_sem); |
f45d3416 | 419 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 420 | list_del(&li->llist); |
85160e03 | 421 | cifs_del_lock_waiters(li); |
cdff08e7 | 422 | kfree(li); |
b33879aa | 423 | } |
f45d3416 PS |
424 | list_del(&cifs_file->llist->llist); |
425 | kfree(cifs_file->llist); | |
1b4b55a1 | 426 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
427 | |
428 | cifs_put_tlink(cifs_file->tlink); | |
429 | dput(cifs_file->dentry); | |
24261fc2 | 430 | cifs_sb_deactive(sb); |
cdff08e7 | 431 | kfree(cifs_file); |
b33879aa JL |
432 | } |
433 | ||
1da177e4 | 434 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 435 | |
1da177e4 LT |
436 | { |
437 | int rc = -EACCES; | |
6d5786a3 | 438 | unsigned int xid; |
590a3fe0 | 439 | __u32 oplock; |
1da177e4 | 440 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 441 | struct TCP_Server_Info *server; |
96daf2b0 | 442 | struct cifs_tcon *tcon; |
7ffec372 | 443 | struct tcon_link *tlink; |
fb1214e4 | 444 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 445 | char *full_path = NULL; |
7e12eddb | 446 | bool posix_open_ok = false; |
fb1214e4 | 447 | struct cifs_fid fid; |
233839b1 | 448 | struct cifs_pending_open open; |
1da177e4 | 449 | |
6d5786a3 | 450 | xid = get_xid(); |
1da177e4 LT |
451 | |
452 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
453 | tlink = cifs_sb_tlink(cifs_sb); |
454 | if (IS_ERR(tlink)) { | |
6d5786a3 | 455 | free_xid(xid); |
7ffec372 JL |
456 | return PTR_ERR(tlink); |
457 | } | |
458 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 459 | server = tcon->ses->server; |
1da177e4 | 460 | |
e6a00296 | 461 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 462 | if (full_path == NULL) { |
0f3bc09e | 463 | rc = -ENOMEM; |
232341ba | 464 | goto out; |
1da177e4 LT |
465 | } |
466 | ||
f96637be | 467 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 468 | inode, file->f_flags, full_path); |
276a74a4 | 469 | |
233839b1 | 470 | if (server->oplocks) |
276a74a4 SF |
471 | oplock = REQ_OPLOCK; |
472 | else | |
473 | oplock = 0; | |
474 | ||
64cc2c63 | 475 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
476 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
477 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 478 | /* can not refresh inode info since size could be stale */ |
2422f676 | 479 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 480 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 481 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 482 | if (rc == 0) { |
f96637be | 483 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 484 | posix_open_ok = true; |
64cc2c63 SF |
485 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
486 | if (tcon->ses->serverNOS) | |
f96637be JP |
487 | cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
488 | tcon->ses->serverName, | |
489 | tcon->ses->serverNOS); | |
64cc2c63 | 490 | tcon->broken_posix_open = true; |
276a74a4 SF |
491 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
492 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
493 | goto out; | |
fb1214e4 PS |
494 | /* |
495 | * Else fallthrough to retry open the old way on network i/o | |
496 | * or DFS errors. | |
497 | */ | |
276a74a4 SF |
498 | } |
499 | ||
233839b1 PS |
500 | if (server->ops->get_lease_key) |
501 | server->ops->get_lease_key(inode, &fid); | |
502 | ||
503 | cifs_add_pending_open(&fid, tlink, &open); | |
504 | ||
7e12eddb | 505 | if (!posix_open_ok) { |
b8c32dbb PS |
506 | if (server->ops->get_lease_key) |
507 | server->ops->get_lease_key(inode, &fid); | |
508 | ||
7e12eddb | 509 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 510 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
511 | if (rc) { |
512 | cifs_del_pending_open(&open); | |
7e12eddb | 513 | goto out; |
233839b1 | 514 | } |
7e12eddb | 515 | } |
47c78b7f | 516 | |
fb1214e4 PS |
517 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
518 | if (cfile == NULL) { | |
b8c32dbb PS |
519 | if (server->ops->close) |
520 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 521 | cifs_del_pending_open(&open); |
1da177e4 LT |
522 | rc = -ENOMEM; |
523 | goto out; | |
524 | } | |
1da177e4 | 525 | |
9451a9a5 SJ |
526 | cifs_fscache_set_inode_cookie(inode, file); |
527 | ||
7e12eddb | 528 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
529 | /* |
530 | * Time to set mode which we can not set earlier due to | |
531 | * problems creating new read-only files. | |
532 | */ | |
7e12eddb PS |
533 | struct cifs_unix_set_info_args args = { |
534 | .mode = inode->i_mode, | |
49418b2c EB |
535 | .uid = INVALID_UID, /* no change */ |
536 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
537 | .ctime = NO_CHANGE_64, |
538 | .atime = NO_CHANGE_64, | |
539 | .mtime = NO_CHANGE_64, | |
540 | .device = 0, | |
541 | }; | |
fb1214e4 PS |
542 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
543 | cfile->pid); | |
1da177e4 LT |
544 | } |
545 | ||
546 | out: | |
1da177e4 | 547 | kfree(full_path); |
6d5786a3 | 548 | free_xid(xid); |
7ffec372 | 549 | cifs_put_tlink(tlink); |
1da177e4 LT |
550 | return rc; |
551 | } | |
552 | ||
f152fd5f PS |
553 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
554 | ||
2ae78ba8 PS |
555 | /* |
556 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 557 | * to server was lost. |
2ae78ba8 | 558 | */ |
f152fd5f PS |
559 | static int |
560 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 561 | { |
f152fd5f PS |
562 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
563 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
564 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
565 | int rc = 0; |
566 | ||
689c3db4 | 567 | down_read(&cinode->lock_sem); |
f152fd5f | 568 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
569 | /* can cache locks - no need to relock */ |
570 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
571 | return rc; |
572 | } | |
573 | ||
574 | if (cap_unix(tcon->ses) && | |
575 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
576 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
577 | rc = cifs_push_posix_locks(cfile); | |
578 | else | |
579 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 580 | |
689c3db4 | 581 | up_read(&cinode->lock_sem); |
1da177e4 LT |
582 | return rc; |
583 | } | |
584 | ||
2ae78ba8 PS |
585 | static int |
586 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
587 | { |
588 | int rc = -EACCES; | |
6d5786a3 | 589 | unsigned int xid; |
590a3fe0 | 590 | __u32 oplock; |
1da177e4 | 591 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 592 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
593 | struct TCP_Server_Info *server; |
594 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 595 | struct inode *inode; |
1da177e4 | 596 | char *full_path = NULL; |
2ae78ba8 | 597 | int desired_access; |
1da177e4 | 598 | int disposition = FILE_OPEN; |
3d3ea8e6 | 599 | int create_options = CREATE_NOT_DIR; |
226730b4 | 600 | struct cifs_open_parms oparms; |
1da177e4 | 601 | |
6d5786a3 | 602 | xid = get_xid(); |
2ae78ba8 PS |
603 | mutex_lock(&cfile->fh_mutex); |
604 | if (!cfile->invalidHandle) { | |
605 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 606 | rc = 0; |
6d5786a3 | 607 | free_xid(xid); |
0f3bc09e | 608 | return rc; |
1da177e4 LT |
609 | } |
610 | ||
2ae78ba8 | 611 | inode = cfile->dentry->d_inode; |
1da177e4 | 612 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
613 | tcon = tlink_tcon(cfile->tlink); |
614 | server = tcon->ses->server; | |
615 | ||
616 | /* | |
617 | * Can not grab rename sem here because various ops, including those | |
618 | * that already have the rename sem can end up causing writepage to get | |
619 | * called and if the server was down that means we end up here, and we | |
620 | * can never tell if the caller already has the rename_sem. | |
621 | */ | |
622 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 623 | if (full_path == NULL) { |
3a9f462f | 624 | rc = -ENOMEM; |
2ae78ba8 | 625 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 626 | free_xid(xid); |
3a9f462f | 627 | return rc; |
1da177e4 LT |
628 | } |
629 | ||
f96637be JP |
630 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
631 | inode, cfile->f_flags, full_path); | |
1da177e4 | 632 | |
10b9b98e | 633 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
634 | oplock = REQ_OPLOCK; |
635 | else | |
4b18f2a9 | 636 | oplock = 0; |
1da177e4 | 637 | |
29e20f9c | 638 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 639 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 640 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
641 | /* |
642 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
643 | * original open. Must mask them off for a reopen. | |
644 | */ | |
2ae78ba8 | 645 | unsigned int oflags = cfile->f_flags & |
15886177 | 646 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 647 | |
2422f676 | 648 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 | 649 | cifs_sb->mnt_file_mode /* ignored */, |
9cbc0b73 | 650 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 651 | if (rc == 0) { |
f96637be | 652 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 653 | oparms.reconnect = true; |
7fc8f4e9 SF |
654 | goto reopen_success; |
655 | } | |
2ae78ba8 PS |
656 | /* |
657 | * fallthrough to retry open the old way on errors, especially | |
658 | * in the reconnect path it is important to retry hard | |
659 | */ | |
7fc8f4e9 SF |
660 | } |
661 | ||
2ae78ba8 | 662 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 663 | |
3d3ea8e6 SP |
664 | if (backup_cred(cifs_sb)) |
665 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
666 | ||
b8c32dbb | 667 | if (server->ops->get_lease_key) |
9cbc0b73 | 668 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 669 | |
226730b4 PS |
670 | oparms.tcon = tcon; |
671 | oparms.cifs_sb = cifs_sb; | |
672 | oparms.desired_access = desired_access; | |
673 | oparms.create_options = create_options; | |
674 | oparms.disposition = disposition; | |
675 | oparms.path = full_path; | |
9cbc0b73 PS |
676 | oparms.fid = &cfile->fid; |
677 | oparms.reconnect = true; | |
226730b4 | 678 | |
2ae78ba8 PS |
679 | /* |
680 | * Can not refresh inode by passing in file_info buf to be returned by | |
d81b8a40 | 681 | * ops->open and then calling get_inode_info with returned buf since |
2ae78ba8 PS |
682 | * file might have write behind data that needs to be flushed and server |
683 | * version of file size can be stale. If we knew for sure that inode was | |
684 | * not dirty locally we could do this. | |
685 | */ | |
226730b4 | 686 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
687 | if (rc == -ENOENT && oparms.reconnect == false) { |
688 | /* durable handle timeout is expired - open the file again */ | |
689 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
690 | /* indicate that we need to relock the file */ | |
691 | oparms.reconnect = true; | |
692 | } | |
693 | ||
1da177e4 | 694 | if (rc) { |
2ae78ba8 | 695 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
696 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
697 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
698 | goto reopen_error_exit; |
699 | } | |
700 | ||
7fc8f4e9 | 701 | reopen_success: |
2ae78ba8 PS |
702 | cfile->invalidHandle = false; |
703 | mutex_unlock(&cfile->fh_mutex); | |
704 | cinode = CIFS_I(inode); | |
15886177 JL |
705 | |
706 | if (can_flush) { | |
707 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 708 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 709 | |
15886177 | 710 | if (tcon->unix_ext) |
2ae78ba8 PS |
711 | rc = cifs_get_inode_info_unix(&inode, full_path, |
712 | inode->i_sb, xid); | |
15886177 | 713 | else |
2ae78ba8 PS |
714 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
715 | inode->i_sb, xid, NULL); | |
716 | } | |
717 | /* | |
718 | * Else we are writing out data to server already and could deadlock if | |
719 | * we tried to flush data, and since we do not know if we have data that | |
720 | * would invalidate the current end of file on the server we can not go | |
721 | * to the server to get the new inode info. | |
722 | */ | |
723 | ||
9cbc0b73 PS |
724 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
725 | if (oparms.reconnect) | |
726 | cifs_relock_file(cfile); | |
15886177 JL |
727 | |
728 | reopen_error_exit: | |
1da177e4 | 729 | kfree(full_path); |
6d5786a3 | 730 | free_xid(xid); |
1da177e4 LT |
731 | return rc; |
732 | } | |
733 | ||
734 | int cifs_close(struct inode *inode, struct file *file) | |
735 | { | |
77970693 JL |
736 | if (file->private_data != NULL) { |
737 | cifsFileInfo_put(file->private_data); | |
738 | file->private_data = NULL; | |
739 | } | |
7ee1af76 | 740 | |
cdff08e7 SF |
741 | /* return code from the ->release op is always ignored */ |
742 | return 0; | |
1da177e4 LT |
743 | } |
744 | ||
745 | int cifs_closedir(struct inode *inode, struct file *file) | |
746 | { | |
747 | int rc = 0; | |
6d5786a3 | 748 | unsigned int xid; |
4b4de76e | 749 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
750 | struct cifs_tcon *tcon; |
751 | struct TCP_Server_Info *server; | |
752 | char *buf; | |
1da177e4 | 753 | |
f96637be | 754 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 755 | |
92fc65a7 PS |
756 | if (cfile == NULL) |
757 | return rc; | |
758 | ||
6d5786a3 | 759 | xid = get_xid(); |
92fc65a7 PS |
760 | tcon = tlink_tcon(cfile->tlink); |
761 | server = tcon->ses->server; | |
1da177e4 | 762 | |
f96637be | 763 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
92fc65a7 PS |
764 | spin_lock(&cifs_file_list_lock); |
765 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
766 | cfile->invalidHandle = true; | |
767 | spin_unlock(&cifs_file_list_lock); | |
768 | if (server->ops->close_dir) | |
769 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
770 | else | |
771 | rc = -ENOSYS; | |
f96637be | 772 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
773 | /* not much we can do if it fails anyway, ignore rc */ |
774 | rc = 0; | |
775 | } else | |
776 | spin_unlock(&cifs_file_list_lock); | |
777 | ||
778 | buf = cfile->srch_inf.ntwrk_buf_start; | |
779 | if (buf) { | |
f96637be | 780 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
781 | cfile->srch_inf.ntwrk_buf_start = NULL; |
782 | if (cfile->srch_inf.smallBuf) | |
783 | cifs_small_buf_release(buf); | |
784 | else | |
785 | cifs_buf_release(buf); | |
1da177e4 | 786 | } |
92fc65a7 PS |
787 | |
788 | cifs_put_tlink(cfile->tlink); | |
789 | kfree(file->private_data); | |
790 | file->private_data = NULL; | |
1da177e4 | 791 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 792 | free_xid(xid); |
1da177e4 LT |
793 | return rc; |
794 | } | |
795 | ||
85160e03 | 796 | static struct cifsLockInfo * |
fbd35aca | 797 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 798 | { |
a88b4707 | 799 | struct cifsLockInfo *lock = |
fb8c4b14 | 800 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
801 | if (!lock) |
802 | return lock; | |
803 | lock->offset = offset; | |
804 | lock->length = length; | |
805 | lock->type = type; | |
a88b4707 PS |
806 | lock->pid = current->tgid; |
807 | INIT_LIST_HEAD(&lock->blist); | |
808 | init_waitqueue_head(&lock->block_q); | |
809 | return lock; | |
85160e03 PS |
810 | } |
811 | ||
f7ba7fe6 | 812 | void |
85160e03 PS |
813 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
814 | { | |
815 | struct cifsLockInfo *li, *tmp; | |
816 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
817 | list_del_init(&li->blist); | |
818 | wake_up(&li->block_q); | |
819 | } | |
820 | } | |
821 | ||
081c0414 PS |
822 | #define CIFS_LOCK_OP 0 |
823 | #define CIFS_READ_OP 1 | |
824 | #define CIFS_WRITE_OP 2 | |
825 | ||
826 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 827 | static bool |
f45d3416 PS |
828 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
829 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 830 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 831 | { |
fbd35aca | 832 | struct cifsLockInfo *li; |
f45d3416 | 833 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 834 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 835 | |
f45d3416 | 836 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
837 | if (offset + length <= li->offset || |
838 | offset >= li->offset + li->length) | |
839 | continue; | |
081c0414 PS |
840 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
841 | server->ops->compare_fids(cfile, cur_cfile)) { | |
842 | /* shared lock prevents write op through the same fid */ | |
843 | if (!(li->type & server->vals->shared_lock_type) || | |
844 | rw_check != CIFS_WRITE_OP) | |
845 | continue; | |
846 | } | |
f45d3416 PS |
847 | if ((type & server->vals->shared_lock_type) && |
848 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
849 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 850 | continue; |
579f9053 PS |
851 | if (conf_lock) |
852 | *conf_lock = li; | |
f45d3416 | 853 | return true; |
85160e03 PS |
854 | } |
855 | return false; | |
856 | } | |
857 | ||
579f9053 | 858 | bool |
55157dfb | 859 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 860 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 861 | int rw_check) |
161ebf9f | 862 | { |
fbd35aca | 863 | bool rc = false; |
f45d3416 | 864 | struct cifs_fid_locks *cur; |
55157dfb | 865 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 866 | |
f45d3416 PS |
867 | list_for_each_entry(cur, &cinode->llist, llist) { |
868 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 869 | cfile, conf_lock, rw_check); |
fbd35aca PS |
870 | if (rc) |
871 | break; | |
872 | } | |
fbd35aca PS |
873 | |
874 | return rc; | |
161ebf9f PS |
875 | } |
876 | ||
9a5101c8 PS |
877 | /* |
878 | * Check if there is another lock that prevents us to set the lock (mandatory | |
879 | * style). If such a lock exists, update the flock structure with its | |
880 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
881 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
882 | * the server or 1 otherwise. | |
883 | */ | |
85160e03 | 884 | static int |
fbd35aca PS |
885 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
886 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
887 | { |
888 | int rc = 0; | |
889 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 890 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 891 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
892 | bool exist; |
893 | ||
1b4b55a1 | 894 | down_read(&cinode->lock_sem); |
85160e03 | 895 | |
55157dfb | 896 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 897 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
898 | if (exist) { |
899 | flock->fl_start = conf_lock->offset; | |
900 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
901 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 902 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
903 | flock->fl_type = F_RDLCK; |
904 | else | |
905 | flock->fl_type = F_WRLCK; | |
906 | } else if (!cinode->can_cache_brlcks) | |
907 | rc = 1; | |
908 | else | |
909 | flock->fl_type = F_UNLCK; | |
910 | ||
1b4b55a1 | 911 | up_read(&cinode->lock_sem); |
85160e03 PS |
912 | return rc; |
913 | } | |
914 | ||
161ebf9f | 915 | static void |
fbd35aca | 916 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 917 | { |
fbd35aca | 918 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 919 | down_write(&cinode->lock_sem); |
f45d3416 | 920 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 921 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
922 | } |
923 | ||
9a5101c8 PS |
924 | /* |
925 | * Set the byte-range lock (mandatory style). Returns: | |
926 | * 1) 0, if we set the lock and don't need to request to the server; | |
927 | * 2) 1, if no locks prevent us but we need to request to the server; | |
928 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
929 | */ | |
85160e03 | 930 | static int |
fbd35aca | 931 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 932 | bool wait) |
85160e03 | 933 | { |
161ebf9f | 934 | struct cifsLockInfo *conf_lock; |
fbd35aca | 935 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
936 | bool exist; |
937 | int rc = 0; | |
938 | ||
85160e03 PS |
939 | try_again: |
940 | exist = false; | |
1b4b55a1 | 941 | down_write(&cinode->lock_sem); |
85160e03 | 942 | |
55157dfb | 943 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 944 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 945 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 946 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 947 | up_write(&cinode->lock_sem); |
85160e03 PS |
948 | return rc; |
949 | } | |
950 | ||
951 | if (!exist) | |
952 | rc = 1; | |
953 | else if (!wait) | |
954 | rc = -EACCES; | |
955 | else { | |
956 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 957 | up_write(&cinode->lock_sem); |
85160e03 PS |
958 | rc = wait_event_interruptible(lock->block_q, |
959 | (lock->blist.prev == &lock->blist) && | |
960 | (lock->blist.next == &lock->blist)); | |
961 | if (!rc) | |
962 | goto try_again; | |
1b4b55a1 | 963 | down_write(&cinode->lock_sem); |
a88b4707 | 964 | list_del_init(&lock->blist); |
85160e03 PS |
965 | } |
966 | ||
1b4b55a1 | 967 | up_write(&cinode->lock_sem); |
85160e03 PS |
968 | return rc; |
969 | } | |
970 | ||
9a5101c8 PS |
971 | /* |
972 | * Check if there is another lock that prevents us to set the lock (posix | |
973 | * style). If such a lock exists, update the flock structure with its | |
974 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
975 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
976 | * the server or 1 otherwise. | |
977 | */ | |
85160e03 | 978 | static int |
4f6bcec9 PS |
979 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
980 | { | |
981 | int rc = 0; | |
496ad9aa | 982 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
983 | unsigned char saved_type = flock->fl_type; |
984 | ||
50792760 PS |
985 | if ((flock->fl_flags & FL_POSIX) == 0) |
986 | return 1; | |
987 | ||
1b4b55a1 | 988 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
989 | posix_test_lock(file, flock); |
990 | ||
991 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
992 | flock->fl_type = saved_type; | |
993 | rc = 1; | |
994 | } | |
995 | ||
1b4b55a1 | 996 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
997 | return rc; |
998 | } | |
999 | ||
9a5101c8 PS |
1000 | /* |
1001 | * Set the byte-range lock (posix style). Returns: | |
1002 | * 1) 0, if we set the lock and don't need to request to the server; | |
1003 | * 2) 1, if we need to request to the server; | |
1004 | * 3) <0, if the error occurs while setting the lock. | |
1005 | */ | |
4f6bcec9 PS |
1006 | static int |
1007 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1008 | { | |
496ad9aa | 1009 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
1010 | int rc = 1; |
1011 | ||
1012 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1013 | return rc; | |
4f6bcec9 | 1014 | |
66189be7 | 1015 | try_again: |
1b4b55a1 | 1016 | down_write(&cinode->lock_sem); |
4f6bcec9 | 1017 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1018 | up_write(&cinode->lock_sem); |
50792760 | 1019 | return rc; |
4f6bcec9 | 1020 | } |
66189be7 PS |
1021 | |
1022 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1023 | up_write(&cinode->lock_sem); |
66189be7 PS |
1024 | if (rc == FILE_LOCK_DEFERRED) { |
1025 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1026 | if (!rc) | |
1027 | goto try_again; | |
1a9e64a7 | 1028 | posix_unblock_lock(flock); |
66189be7 | 1029 | } |
9ebb389d | 1030 | return rc; |
4f6bcec9 PS |
1031 | } |
1032 | ||
d39a4f71 | 1033 | int |
4f6bcec9 | 1034 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1035 | { |
6d5786a3 PS |
1036 | unsigned int xid; |
1037 | int rc = 0, stored_rc; | |
85160e03 PS |
1038 | struct cifsLockInfo *li, *tmp; |
1039 | struct cifs_tcon *tcon; | |
0013fb4c | 1040 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1041 | LOCKING_ANDX_RANGE *buf, *cur; |
1042 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1043 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1044 | int i; | |
85160e03 | 1045 | |
6d5786a3 | 1046 | xid = get_xid(); |
85160e03 PS |
1047 | tcon = tlink_tcon(cfile->tlink); |
1048 | ||
0013fb4c PS |
1049 | /* |
1050 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1051 | * and check it for zero before using. | |
1052 | */ | |
1053 | max_buf = tcon->ses->server->maxBuf; | |
1054 | if (!max_buf) { | |
6d5786a3 | 1055 | free_xid(xid); |
0013fb4c PS |
1056 | return -EINVAL; |
1057 | } | |
1058 | ||
1059 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1060 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1061 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1062 | if (!buf) { | |
6d5786a3 | 1063 | free_xid(xid); |
e2f2886a | 1064 | return -ENOMEM; |
32b9aaf1 PS |
1065 | } |
1066 | ||
1067 | for (i = 0; i < 2; i++) { | |
1068 | cur = buf; | |
1069 | num = 0; | |
f45d3416 | 1070 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1071 | if (li->type != types[i]) |
1072 | continue; | |
1073 | cur->Pid = cpu_to_le16(li->pid); | |
1074 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1075 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1076 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1077 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1078 | if (++num == max_num) { | |
4b4de76e PS |
1079 | stored_rc = cifs_lockv(xid, tcon, |
1080 | cfile->fid.netfid, | |
04a6aa8a PS |
1081 | (__u8)li->type, 0, num, |
1082 | buf); | |
32b9aaf1 PS |
1083 | if (stored_rc) |
1084 | rc = stored_rc; | |
1085 | cur = buf; | |
1086 | num = 0; | |
1087 | } else | |
1088 | cur++; | |
1089 | } | |
1090 | ||
1091 | if (num) { | |
4b4de76e | 1092 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1093 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1094 | if (stored_rc) |
1095 | rc = stored_rc; | |
1096 | } | |
85160e03 PS |
1097 | } |
1098 | ||
32b9aaf1 | 1099 | kfree(buf); |
6d5786a3 | 1100 | free_xid(xid); |
85160e03 PS |
1101 | return rc; |
1102 | } | |
1103 | ||
4f6bcec9 PS |
1104 | /* copied from fs/locks.c with a name change */ |
1105 | #define cifs_for_each_lock(inode, lockp) \ | |
1106 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1107 | lockp = &(*lockp)->fl_next) | |
1108 | ||
d5751469 PS |
1109 | struct lock_to_push { |
1110 | struct list_head llist; | |
1111 | __u64 offset; | |
1112 | __u64 length; | |
1113 | __u32 pid; | |
1114 | __u16 netfid; | |
1115 | __u8 type; | |
1116 | }; | |
1117 | ||
4f6bcec9 | 1118 | static int |
b8db928b | 1119 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1120 | { |
1c8c601a | 1121 | struct inode *inode = cfile->dentry->d_inode; |
4f6bcec9 PS |
1122 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1123 | struct file_lock *flock, **before; | |
d5751469 | 1124 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1125 | int rc = 0, xid, type; |
d5751469 PS |
1126 | struct list_head locks_to_send, *el; |
1127 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1128 | __u64 length; |
4f6bcec9 | 1129 | |
6d5786a3 | 1130 | xid = get_xid(); |
4f6bcec9 | 1131 | |
1c8c601a JL |
1132 | spin_lock(&inode->i_lock); |
1133 | cifs_for_each_lock(inode, before) { | |
d5751469 PS |
1134 | if ((*before)->fl_flags & FL_POSIX) |
1135 | count++; | |
1136 | } | |
1c8c601a | 1137 | spin_unlock(&inode->i_lock); |
d5751469 | 1138 | |
4f6bcec9 PS |
1139 | INIT_LIST_HEAD(&locks_to_send); |
1140 | ||
d5751469 | 1141 | /* |
ce85852b | 1142 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1143 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1144 | * protects locking operations of this inode. |
d5751469 PS |
1145 | */ |
1146 | for (; i < count; i++) { | |
1147 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1148 | if (!lck) { | |
1149 | rc = -ENOMEM; | |
1150 | goto err_out; | |
1151 | } | |
1152 | list_add_tail(&lck->llist, &locks_to_send); | |
1153 | } | |
1154 | ||
d5751469 | 1155 | el = locks_to_send.next; |
1c8c601a JL |
1156 | spin_lock(&inode->i_lock); |
1157 | cifs_for_each_lock(inode, before) { | |
ce85852b PS |
1158 | flock = *before; |
1159 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1160 | continue; | |
d5751469 | 1161 | if (el == &locks_to_send) { |
ce85852b PS |
1162 | /* |
1163 | * The list ended. We don't have enough allocated | |
1164 | * structures - something is really wrong. | |
1165 | */ | |
f96637be | 1166 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1167 | break; |
1168 | } | |
4f6bcec9 PS |
1169 | length = 1 + flock->fl_end - flock->fl_start; |
1170 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1171 | type = CIFS_RDLCK; | |
1172 | else | |
1173 | type = CIFS_WRLCK; | |
d5751469 | 1174 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1175 | lck->pid = flock->fl_pid; |
4b4de76e | 1176 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1177 | lck->length = length; |
1178 | lck->type = type; | |
1179 | lck->offset = flock->fl_start; | |
d5751469 | 1180 | el = el->next; |
4f6bcec9 | 1181 | } |
1c8c601a | 1182 | spin_unlock(&inode->i_lock); |
4f6bcec9 PS |
1183 | |
1184 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1185 | int stored_rc; |
1186 | ||
4f6bcec9 | 1187 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1188 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1189 | lck->type, 0); |
1190 | if (stored_rc) | |
1191 | rc = stored_rc; | |
1192 | list_del(&lck->llist); | |
1193 | kfree(lck); | |
1194 | } | |
1195 | ||
d5751469 | 1196 | out: |
6d5786a3 | 1197 | free_xid(xid); |
4f6bcec9 | 1198 | return rc; |
d5751469 PS |
1199 | err_out: |
1200 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1201 | list_del(&lck->llist); | |
1202 | kfree(lck); | |
1203 | } | |
1204 | goto out; | |
4f6bcec9 PS |
1205 | } |
1206 | ||
9ec3c882 | 1207 | static int |
b8db928b | 1208 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1209 | { |
b8db928b | 1210 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1211 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1212 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1213 | int rc = 0; |
1214 | ||
1215 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1216 | down_write(&cinode->lock_sem); | |
1217 | if (!cinode->can_cache_brlcks) { | |
1218 | up_write(&cinode->lock_sem); | |
1219 | return rc; | |
1220 | } | |
4f6bcec9 | 1221 | |
29e20f9c | 1222 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1223 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1224 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1225 | rc = cifs_push_posix_locks(cfile); |
1226 | else | |
1227 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1228 | |
b8db928b PS |
1229 | cinode->can_cache_brlcks = false; |
1230 | up_write(&cinode->lock_sem); | |
1231 | return rc; | |
4f6bcec9 PS |
1232 | } |
1233 | ||
03776f45 | 1234 | static void |
04a6aa8a | 1235 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1236 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1237 | { |
03776f45 | 1238 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1239 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1240 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1241 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1242 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1243 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1244 | *wait_flag = true; |
1da177e4 | 1245 | } |
03776f45 | 1246 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1247 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1248 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1249 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1250 | if (flock->fl_flags & |
3d6d854a JL |
1251 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1252 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1253 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1254 | |
106dc538 | 1255 | *type = server->vals->large_lock_type; |
03776f45 | 1256 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1257 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1258 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1259 | *lock = 1; |
1260 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1261 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1262 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1263 | *unlock = 1; |
1264 | /* Check if unlock includes more than one lock range */ | |
1265 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1266 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1267 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1268 | *lock = 1; |
1269 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1270 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1271 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1272 | *lock = 1; |
1273 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1274 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1275 | *type |= server->vals->shared_lock_type; |
03776f45 | 1276 | *lock = 1; |
1da177e4 | 1277 | } else |
f96637be | 1278 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1279 | } |
1da177e4 | 1280 | |
03776f45 | 1281 | static int |
04a6aa8a | 1282 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1283 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1284 | { |
1285 | int rc = 0; | |
1286 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1287 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1288 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1289 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1290 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1291 | |
03776f45 PS |
1292 | if (posix_lck) { |
1293 | int posix_lock_type; | |
4f6bcec9 PS |
1294 | |
1295 | rc = cifs_posix_lock_test(file, flock); | |
1296 | if (!rc) | |
1297 | return rc; | |
1298 | ||
106dc538 | 1299 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1300 | posix_lock_type = CIFS_RDLCK; |
1301 | else | |
1302 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1303 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1304 | flock->fl_start, length, flock, |
4f6bcec9 | 1305 | posix_lock_type, wait_flag); |
03776f45 PS |
1306 | return rc; |
1307 | } | |
1da177e4 | 1308 | |
fbd35aca | 1309 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1310 | if (!rc) |
1311 | return rc; | |
1312 | ||
03776f45 | 1313 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1314 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1315 | 1, 0, false); | |
03776f45 | 1316 | if (rc == 0) { |
d39a4f71 PS |
1317 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1318 | type, 0, 1, false); | |
03776f45 PS |
1319 | flock->fl_type = F_UNLCK; |
1320 | if (rc != 0) | |
f96637be JP |
1321 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1322 | rc); | |
a88b4707 | 1323 | return 0; |
1da177e4 | 1324 | } |
7ee1af76 | 1325 | |
106dc538 | 1326 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1327 | flock->fl_type = F_WRLCK; |
a88b4707 | 1328 | return 0; |
7ee1af76 JA |
1329 | } |
1330 | ||
d39a4f71 PS |
1331 | type &= ~server->vals->exclusive_lock_type; |
1332 | ||
1333 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1334 | type | server->vals->shared_lock_type, | |
1335 | 1, 0, false); | |
03776f45 | 1336 | if (rc == 0) { |
d39a4f71 PS |
1337 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1338 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1339 | flock->fl_type = F_RDLCK; |
1340 | if (rc != 0) | |
f96637be JP |
1341 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1342 | rc); | |
03776f45 PS |
1343 | } else |
1344 | flock->fl_type = F_WRLCK; | |
1345 | ||
a88b4707 | 1346 | return 0; |
03776f45 PS |
1347 | } |
1348 | ||
f7ba7fe6 | 1349 | void |
9ee305b7 PS |
1350 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1351 | { | |
1352 | struct list_head *li, *tmp; | |
1353 | list_for_each_safe(li, tmp, source) | |
1354 | list_move(li, dest); | |
1355 | } | |
1356 | ||
f7ba7fe6 | 1357 | void |
9ee305b7 PS |
1358 | cifs_free_llist(struct list_head *llist) |
1359 | { | |
1360 | struct cifsLockInfo *li, *tmp; | |
1361 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1362 | cifs_del_lock_waiters(li); | |
1363 | list_del(&li->llist); | |
1364 | kfree(li); | |
1365 | } | |
1366 | } | |
1367 | ||
d39a4f71 | 1368 | int |
6d5786a3 PS |
1369 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1370 | unsigned int xid) | |
9ee305b7 PS |
1371 | { |
1372 | int rc = 0, stored_rc; | |
1373 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1374 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1375 | unsigned int i; | |
0013fb4c | 1376 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1377 | LOCKING_ANDX_RANGE *buf, *cur; |
1378 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1379 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1380 | struct cifsLockInfo *li, *tmp; | |
1381 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1382 | struct list_head tmp_llist; | |
1383 | ||
1384 | INIT_LIST_HEAD(&tmp_llist); | |
1385 | ||
0013fb4c PS |
1386 | /* |
1387 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1388 | * and check it for zero before using. | |
1389 | */ | |
1390 | max_buf = tcon->ses->server->maxBuf; | |
1391 | if (!max_buf) | |
1392 | return -EINVAL; | |
1393 | ||
1394 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1395 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1396 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1397 | if (!buf) | |
1398 | return -ENOMEM; | |
1399 | ||
1b4b55a1 | 1400 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1401 | for (i = 0; i < 2; i++) { |
1402 | cur = buf; | |
1403 | num = 0; | |
f45d3416 | 1404 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1405 | if (flock->fl_start > li->offset || |
1406 | (flock->fl_start + length) < | |
1407 | (li->offset + li->length)) | |
1408 | continue; | |
1409 | if (current->tgid != li->pid) | |
1410 | continue; | |
9ee305b7 PS |
1411 | if (types[i] != li->type) |
1412 | continue; | |
ea319d57 | 1413 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1414 | /* |
1415 | * We can cache brlock requests - simply remove | |
fbd35aca | 1416 | * a lock from the file's list. |
9ee305b7 PS |
1417 | */ |
1418 | list_del(&li->llist); | |
1419 | cifs_del_lock_waiters(li); | |
1420 | kfree(li); | |
ea319d57 | 1421 | continue; |
9ee305b7 | 1422 | } |
ea319d57 PS |
1423 | cur->Pid = cpu_to_le16(li->pid); |
1424 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1425 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1426 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1427 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1428 | /* | |
1429 | * We need to save a lock here to let us add it again to | |
1430 | * the file's list if the unlock range request fails on | |
1431 | * the server. | |
1432 | */ | |
1433 | list_move(&li->llist, &tmp_llist); | |
1434 | if (++num == max_num) { | |
4b4de76e PS |
1435 | stored_rc = cifs_lockv(xid, tcon, |
1436 | cfile->fid.netfid, | |
ea319d57 PS |
1437 | li->type, num, 0, buf); |
1438 | if (stored_rc) { | |
1439 | /* | |
1440 | * We failed on the unlock range | |
1441 | * request - add all locks from the tmp | |
1442 | * list to the head of the file's list. | |
1443 | */ | |
1444 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1445 | &cfile->llist->locks); |
ea319d57 PS |
1446 | rc = stored_rc; |
1447 | } else | |
1448 | /* | |
1449 | * The unlock range request succeed - | |
1450 | * free the tmp list. | |
1451 | */ | |
1452 | cifs_free_llist(&tmp_llist); | |
1453 | cur = buf; | |
1454 | num = 0; | |
1455 | } else | |
1456 | cur++; | |
9ee305b7 PS |
1457 | } |
1458 | if (num) { | |
4b4de76e | 1459 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1460 | types[i], num, 0, buf); |
1461 | if (stored_rc) { | |
f45d3416 PS |
1462 | cifs_move_llist(&tmp_llist, |
1463 | &cfile->llist->locks); | |
9ee305b7 PS |
1464 | rc = stored_rc; |
1465 | } else | |
1466 | cifs_free_llist(&tmp_llist); | |
1467 | } | |
1468 | } | |
1469 | ||
1b4b55a1 | 1470 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1471 | kfree(buf); |
1472 | return rc; | |
1473 | } | |
1474 | ||
03776f45 | 1475 | static int |
f45d3416 | 1476 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1477 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1478 | unsigned int xid) | |
03776f45 PS |
1479 | { |
1480 | int rc = 0; | |
1481 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1482 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1483 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1484 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1485 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1486 | |
1487 | if (posix_lck) { | |
08547b03 | 1488 | int posix_lock_type; |
4f6bcec9 PS |
1489 | |
1490 | rc = cifs_posix_lock_set(file, flock); | |
1491 | if (!rc || rc < 0) | |
1492 | return rc; | |
1493 | ||
106dc538 | 1494 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1495 | posix_lock_type = CIFS_RDLCK; |
1496 | else | |
1497 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1498 | |
03776f45 | 1499 | if (unlock == 1) |
beb84dc8 | 1500 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1501 | |
f45d3416 PS |
1502 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1503 | current->tgid, flock->fl_start, length, | |
1504 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1505 | goto out; |
1506 | } | |
7ee1af76 | 1507 | |
03776f45 | 1508 | if (lock) { |
161ebf9f PS |
1509 | struct cifsLockInfo *lock; |
1510 | ||
fbd35aca | 1511 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1512 | if (!lock) |
1513 | return -ENOMEM; | |
1514 | ||
fbd35aca | 1515 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1516 | if (rc < 0) { |
161ebf9f | 1517 | kfree(lock); |
21cb2d90 PS |
1518 | return rc; |
1519 | } | |
1520 | if (!rc) | |
85160e03 PS |
1521 | goto out; |
1522 | ||
63b7d3a4 PS |
1523 | /* |
1524 | * Windows 7 server can delay breaking lease from read to None | |
1525 | * if we set a byte-range lock on a file - break it explicitly | |
1526 | * before sending the lock to the server to be sure the next | |
1527 | * read won't conflict with non-overlapted locks due to | |
1528 | * pagereading. | |
1529 | */ | |
18cceb6a PS |
1530 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
1531 | CIFS_CACHE_READ(CIFS_I(inode))) { | |
4f73c7d3 | 1532 | cifs_zap_mapping(inode); |
f96637be JP |
1533 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1534 | inode); | |
18cceb6a | 1535 | CIFS_I(inode)->oplock = 0; |
63b7d3a4 PS |
1536 | } |
1537 | ||
d39a4f71 PS |
1538 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1539 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1540 | if (rc) { |
1541 | kfree(lock); | |
21cb2d90 | 1542 | return rc; |
03776f45 | 1543 | } |
161ebf9f | 1544 | |
fbd35aca | 1545 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1546 | } else if (unlock) |
d39a4f71 | 1547 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1548 | |
03776f45 PS |
1549 | out: |
1550 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1551 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1552 | return rc; |
1553 | } | |
1554 | ||
1555 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1556 | { | |
1557 | int rc, xid; | |
1558 | int lock = 0, unlock = 0; | |
1559 | bool wait_flag = false; | |
1560 | bool posix_lck = false; | |
1561 | struct cifs_sb_info *cifs_sb; | |
1562 | struct cifs_tcon *tcon; | |
1563 | struct cifsInodeInfo *cinode; | |
1564 | struct cifsFileInfo *cfile; | |
1565 | __u16 netfid; | |
04a6aa8a | 1566 | __u32 type; |
03776f45 PS |
1567 | |
1568 | rc = -EACCES; | |
6d5786a3 | 1569 | xid = get_xid(); |
03776f45 | 1570 | |
f96637be JP |
1571 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1572 | cmd, flock->fl_flags, flock->fl_type, | |
1573 | flock->fl_start, flock->fl_end); | |
03776f45 | 1574 | |
03776f45 PS |
1575 | cfile = (struct cifsFileInfo *)file->private_data; |
1576 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1577 | |
1578 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1579 | tcon->ses->server); | |
1580 | ||
1581 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1582 | netfid = cfile->fid.netfid; |
496ad9aa | 1583 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1584 | |
29e20f9c | 1585 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1586 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1587 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1588 | posix_lck = true; | |
1589 | /* | |
1590 | * BB add code here to normalize offset and length to account for | |
1591 | * negative length which we can not accept over the wire. | |
1592 | */ | |
1593 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1594 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1595 | free_xid(xid); |
03776f45 PS |
1596 | return rc; |
1597 | } | |
1598 | ||
1599 | if (!lock && !unlock) { | |
1600 | /* | |
1601 | * if no lock or unlock then nothing to do since we do not | |
1602 | * know what it is | |
1603 | */ | |
6d5786a3 | 1604 | free_xid(xid); |
03776f45 | 1605 | return -EOPNOTSUPP; |
7ee1af76 JA |
1606 | } |
1607 | ||
03776f45 PS |
1608 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1609 | xid); | |
6d5786a3 | 1610 | free_xid(xid); |
1da177e4 LT |
1611 | return rc; |
1612 | } | |
1613 | ||
597b027f JL |
1614 | /* |
1615 | * update the file size (if needed) after a write. Should be called with | |
1616 | * the inode->i_lock held | |
1617 | */ | |
72432ffc | 1618 | void |
fbec9ab9 JL |
1619 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1620 | unsigned int bytes_written) | |
1621 | { | |
1622 | loff_t end_of_write = offset + bytes_written; | |
1623 | ||
1624 | if (end_of_write > cifsi->server_eof) | |
1625 | cifsi->server_eof = end_of_write; | |
1626 | } | |
1627 | ||
ba9ad725 PS |
1628 | static ssize_t |
1629 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1630 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1631 | { |
1632 | int rc = 0; | |
1633 | unsigned int bytes_written = 0; | |
1634 | unsigned int total_written; | |
1635 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1636 | struct cifs_tcon *tcon; |
1637 | struct TCP_Server_Info *server; | |
6d5786a3 | 1638 | unsigned int xid; |
7da4b49a JL |
1639 | struct dentry *dentry = open_file->dentry; |
1640 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1641 | struct cifs_io_parms io_parms; |
1da177e4 | 1642 | |
7da4b49a | 1643 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1644 | |
f96637be JP |
1645 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n", |
1646 | write_size, *offset, dentry->d_name.name); | |
1da177e4 | 1647 | |
ba9ad725 PS |
1648 | tcon = tlink_tcon(open_file->tlink); |
1649 | server = tcon->ses->server; | |
1650 | ||
1651 | if (!server->ops->sync_write) | |
1652 | return -ENOSYS; | |
50c2f753 | 1653 | |
6d5786a3 | 1654 | xid = get_xid(); |
1da177e4 | 1655 | |
1da177e4 LT |
1656 | for (total_written = 0; write_size > total_written; |
1657 | total_written += bytes_written) { | |
1658 | rc = -EAGAIN; | |
1659 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1660 | struct kvec iov[2]; |
1661 | unsigned int len; | |
1662 | ||
1da177e4 | 1663 | if (open_file->invalidHandle) { |
1da177e4 LT |
1664 | /* we could deadlock if we called |
1665 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1666 | reopen_file not to flush data to |
1da177e4 | 1667 | server now */ |
15886177 | 1668 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1669 | if (rc != 0) |
1670 | break; | |
1671 | } | |
ca83ce3d JL |
1672 | |
1673 | len = min((size_t)cifs_sb->wsize, | |
1674 | write_size - total_written); | |
1675 | /* iov[0] is reserved for smb header */ | |
1676 | iov[1].iov_base = (char *)write_data + total_written; | |
1677 | iov[1].iov_len = len; | |
fa2989f4 | 1678 | io_parms.pid = pid; |
ba9ad725 PS |
1679 | io_parms.tcon = tcon; |
1680 | io_parms.offset = *offset; | |
fa2989f4 | 1681 | io_parms.length = len; |
ba9ad725 PS |
1682 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1683 | &bytes_written, iov, 1); | |
1da177e4 LT |
1684 | } |
1685 | if (rc || (bytes_written == 0)) { | |
1686 | if (total_written) | |
1687 | break; | |
1688 | else { | |
6d5786a3 | 1689 | free_xid(xid); |
1da177e4 LT |
1690 | return rc; |
1691 | } | |
fbec9ab9 | 1692 | } else { |
597b027f | 1693 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1694 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1695 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1696 | *offset += bytes_written; |
fbec9ab9 | 1697 | } |
1da177e4 LT |
1698 | } |
1699 | ||
ba9ad725 | 1700 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1701 | |
7da4b49a JL |
1702 | if (total_written > 0) { |
1703 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1704 | if (*offset > dentry->d_inode->i_size) |
1705 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1706 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1707 | } |
7da4b49a | 1708 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1709 | free_xid(xid); |
1da177e4 LT |
1710 | return total_written; |
1711 | } | |
1712 | ||
6508d904 JL |
1713 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1714 | bool fsuid_only) | |
630f3f0c SF |
1715 | { |
1716 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1717 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1718 | ||
1719 | /* only filter by fsuid on multiuser mounts */ | |
1720 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1721 | fsuid_only = false; | |
630f3f0c | 1722 | |
4477288a | 1723 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1724 | /* we could simply get the first_list_entry since write-only entries |
1725 | are always at the end of the list but since the first entry might | |
1726 | have a close pending, we go through the whole list */ | |
1727 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1728 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1729 | continue; |
2e396b83 | 1730 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1731 | if (!open_file->invalidHandle) { |
1732 | /* found a good file */ | |
1733 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1734 | cifsFileInfo_get_locked(open_file); |
4477288a | 1735 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1736 | return open_file; |
1737 | } /* else might as well continue, and look for | |
1738 | another, or simply have the caller reopen it | |
1739 | again rather than trying to fix this handle */ | |
1740 | } else /* write only file */ | |
1741 | break; /* write only files are last so must be done */ | |
1742 | } | |
4477288a | 1743 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1744 | return NULL; |
1745 | } | |
630f3f0c | 1746 | |
6508d904 JL |
1747 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1748 | bool fsuid_only) | |
6148a742 | 1749 | { |
2c0c2a08 | 1750 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1751 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1752 | bool any_available = false; |
dd99cd80 | 1753 | int rc; |
2c0c2a08 | 1754 | unsigned int refind = 0; |
6148a742 | 1755 | |
60808233 SF |
1756 | /* Having a null inode here (because mapping->host was set to zero by |
1757 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1758 | it being zero) during stress testcases so we need to check for it */ | |
1759 | ||
fb8c4b14 | 1760 | if (cifs_inode == NULL) { |
f96637be | 1761 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1762 | dump_stack(); |
1763 | return NULL; | |
1764 | } | |
1765 | ||
d3892294 JL |
1766 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1767 | ||
6508d904 JL |
1768 | /* only filter by fsuid on multiuser mounts */ |
1769 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1770 | fsuid_only = false; | |
1771 | ||
4477288a | 1772 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1773 | refind_writable: |
2c0c2a08 SP |
1774 | if (refind > MAX_REOPEN_ATT) { |
1775 | spin_unlock(&cifs_file_list_lock); | |
1776 | return NULL; | |
1777 | } | |
6148a742 | 1778 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1779 | if (!any_available && open_file->pid != current->tgid) |
1780 | continue; | |
fef59fd7 | 1781 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1782 | continue; |
2e396b83 | 1783 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1784 | if (!open_file->invalidHandle) { |
1785 | /* found a good writable file */ | |
764a1b1a | 1786 | cifsFileInfo_get_locked(open_file); |
4477288a | 1787 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1788 | return open_file; |
2c0c2a08 SP |
1789 | } else { |
1790 | if (!inv_file) | |
1791 | inv_file = open_file; | |
9b22b0b7 | 1792 | } |
6148a742 SF |
1793 | } |
1794 | } | |
2846d386 JL |
1795 | /* couldn't find useable FH with same pid, try any available */ |
1796 | if (!any_available) { | |
1797 | any_available = true; | |
1798 | goto refind_writable; | |
1799 | } | |
2c0c2a08 SP |
1800 | |
1801 | if (inv_file) { | |
1802 | any_available = false; | |
764a1b1a | 1803 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1804 | } |
1805 | ||
4477288a | 1806 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1807 | |
1808 | if (inv_file) { | |
1809 | rc = cifs_reopen_file(inv_file, false); | |
1810 | if (!rc) | |
1811 | return inv_file; | |
1812 | else { | |
1813 | spin_lock(&cifs_file_list_lock); | |
1814 | list_move_tail(&inv_file->flist, | |
1815 | &cifs_inode->openFileList); | |
1816 | spin_unlock(&cifs_file_list_lock); | |
1817 | cifsFileInfo_put(inv_file); | |
1818 | spin_lock(&cifs_file_list_lock); | |
1819 | ++refind; | |
1820 | goto refind_writable; | |
1821 | } | |
1822 | } | |
1823 | ||
6148a742 SF |
1824 | return NULL; |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1828 | { | |
1829 | struct address_space *mapping = page->mapping; | |
1830 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1831 | char *write_data; | |
1832 | int rc = -EFAULT; | |
1833 | int bytes_written = 0; | |
1da177e4 | 1834 | struct inode *inode; |
6148a742 | 1835 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1836 | |
1837 | if (!mapping || !mapping->host) | |
1838 | return -EFAULT; | |
1839 | ||
1840 | inode = page->mapping->host; | |
1da177e4 LT |
1841 | |
1842 | offset += (loff_t)from; | |
1843 | write_data = kmap(page); | |
1844 | write_data += from; | |
1845 | ||
1846 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1847 | kunmap(page); | |
1848 | return -EIO; | |
1849 | } | |
1850 | ||
1851 | /* racing with truncate? */ | |
1852 | if (offset > mapping->host->i_size) { | |
1853 | kunmap(page); | |
1854 | return 0; /* don't care */ | |
1855 | } | |
1856 | ||
1857 | /* check to make sure that we are not extending the file */ | |
1858 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1859 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1860 | |
6508d904 | 1861 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1862 | if (open_file) { |
fa2989f4 PS |
1863 | bytes_written = cifs_write(open_file, open_file->pid, |
1864 | write_data, to - from, &offset); | |
6ab409b5 | 1865 | cifsFileInfo_put(open_file); |
1da177e4 | 1866 | /* Does mm or vfs already set times? */ |
6148a742 | 1867 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1868 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1869 | rc = 0; |
bb5a9a04 SF |
1870 | else if (bytes_written < 0) |
1871 | rc = bytes_written; | |
6148a742 | 1872 | } else { |
f96637be | 1873 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1874 | rc = -EIO; |
1875 | } | |
1876 | ||
1877 | kunmap(page); | |
1878 | return rc; | |
1879 | } | |
1880 | ||
90ac1387 PS |
1881 | static struct cifs_writedata * |
1882 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, | |
1883 | pgoff_t end, pgoff_t *index, | |
1884 | unsigned int *found_pages) | |
1885 | { | |
1886 | unsigned int nr_pages; | |
1887 | struct page **pages; | |
1888 | struct cifs_writedata *wdata; | |
1889 | ||
1890 | wdata = cifs_writedata_alloc((unsigned int)tofind, | |
1891 | cifs_writev_complete); | |
1892 | if (!wdata) | |
1893 | return NULL; | |
1894 | ||
1895 | /* | |
1896 | * find_get_pages_tag seems to return a max of 256 on each | |
1897 | * iteration, so we must call it several times in order to | |
1898 | * fill the array or the wsize is effectively limited to | |
1899 | * 256 * PAGE_CACHE_SIZE. | |
1900 | */ | |
1901 | *found_pages = 0; | |
1902 | pages = wdata->pages; | |
1903 | do { | |
1904 | nr_pages = find_get_pages_tag(mapping, index, | |
1905 | PAGECACHE_TAG_DIRTY, tofind, | |
1906 | pages); | |
1907 | *found_pages += nr_pages; | |
1908 | tofind -= nr_pages; | |
1909 | pages += nr_pages; | |
1910 | } while (nr_pages && tofind && *index <= end); | |
1911 | ||
1912 | return wdata; | |
1913 | } | |
1914 | ||
7e48ff82 PS |
1915 | static unsigned int |
1916 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, | |
1917 | struct address_space *mapping, | |
1918 | struct writeback_control *wbc, | |
1919 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) | |
1920 | { | |
1921 | unsigned int nr_pages = 0, i; | |
1922 | struct page *page; | |
1923 | ||
1924 | for (i = 0; i < found_pages; i++) { | |
1925 | page = wdata->pages[i]; | |
1926 | /* | |
1927 | * At this point we hold neither mapping->tree_lock nor | |
1928 | * lock on the page itself: the page may be truncated or | |
1929 | * invalidated (changing page->mapping to NULL), or even | |
1930 | * swizzled back from swapper_space to tmpfs file | |
1931 | * mapping | |
1932 | */ | |
1933 | ||
1934 | if (nr_pages == 0) | |
1935 | lock_page(page); | |
1936 | else if (!trylock_page(page)) | |
1937 | break; | |
1938 | ||
1939 | if (unlikely(page->mapping != mapping)) { | |
1940 | unlock_page(page); | |
1941 | break; | |
1942 | } | |
1943 | ||
1944 | if (!wbc->range_cyclic && page->index > end) { | |
1945 | *done = true; | |
1946 | unlock_page(page); | |
1947 | break; | |
1948 | } | |
1949 | ||
1950 | if (*next && (page->index != *next)) { | |
1951 | /* Not next consecutive page */ | |
1952 | unlock_page(page); | |
1953 | break; | |
1954 | } | |
1955 | ||
1956 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1957 | wait_on_page_writeback(page); | |
1958 | ||
1959 | if (PageWriteback(page) || | |
1960 | !clear_page_dirty_for_io(page)) { | |
1961 | unlock_page(page); | |
1962 | break; | |
1963 | } | |
1964 | ||
1965 | /* | |
1966 | * This actually clears the dirty bit in the radix tree. | |
1967 | * See cifs_writepage() for more commentary. | |
1968 | */ | |
1969 | set_page_writeback(page); | |
1970 | if (page_offset(page) >= i_size_read(mapping->host)) { | |
1971 | *done = true; | |
1972 | unlock_page(page); | |
1973 | end_page_writeback(page); | |
1974 | break; | |
1975 | } | |
1976 | ||
1977 | wdata->pages[i] = page; | |
1978 | *next = page->index + 1; | |
1979 | ++nr_pages; | |
1980 | } | |
1981 | ||
1982 | /* reset index to refind any pages skipped */ | |
1983 | if (nr_pages == 0) | |
1984 | *index = wdata->pages[0]->index + 1; | |
1985 | ||
1986 | /* put any pages we aren't going to use */ | |
1987 | for (i = nr_pages; i < found_pages; i++) { | |
1988 | page_cache_release(wdata->pages[i]); | |
1989 | wdata->pages[i] = NULL; | |
1990 | } | |
1991 | ||
1992 | return nr_pages; | |
1993 | } | |
1994 | ||
619aa48e PS |
1995 | static int |
1996 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, | |
1997 | struct address_space *mapping, struct writeback_control *wbc) | |
1998 | { | |
1999 | int rc = 0; | |
2000 | struct TCP_Server_Info *server; | |
2001 | unsigned int i; | |
2002 | ||
2003 | wdata->sync_mode = wbc->sync_mode; | |
2004 | wdata->nr_pages = nr_pages; | |
2005 | wdata->offset = page_offset(wdata->pages[0]); | |
2006 | wdata->pagesz = PAGE_CACHE_SIZE; | |
2007 | wdata->tailsz = min(i_size_read(mapping->host) - | |
2008 | page_offset(wdata->pages[nr_pages - 1]), | |
2009 | (loff_t)PAGE_CACHE_SIZE); | |
2010 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + wdata->tailsz; | |
2011 | ||
66231a47 PS |
2012 | if (wdata->cfile != NULL) |
2013 | cifsFileInfo_put(wdata->cfile); | |
2014 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), false); | |
2015 | if (!wdata->cfile) { | |
2016 | cifs_dbg(VFS, "No writable handles for inode\n"); | |
2017 | rc = -EBADF; | |
2018 | } else { | |
619aa48e PS |
2019 | wdata->pid = wdata->cfile->pid; |
2020 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
2021 | rc = server->ops->async_writev(wdata, cifs_writedata_release); | |
66231a47 | 2022 | } |
619aa48e PS |
2023 | |
2024 | for (i = 0; i < nr_pages; ++i) | |
2025 | unlock_page(wdata->pages[i]); | |
2026 | ||
2027 | return rc; | |
2028 | } | |
2029 | ||
1da177e4 | 2030 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 2031 | struct writeback_control *wbc) |
1da177e4 | 2032 | { |
c3d17b63 JL |
2033 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
2034 | bool done = false, scanned = false, range_whole = false; | |
2035 | pgoff_t end, index; | |
2036 | struct cifs_writedata *wdata; | |
37c0eb46 | 2037 | int rc = 0; |
50c2f753 | 2038 | |
37c0eb46 | 2039 | /* |
c3d17b63 | 2040 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
2041 | * one page at a time via cifs_writepage |
2042 | */ | |
2043 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
2044 | return generic_writepages(mapping, wbc); | |
2045 | ||
111ebb6e | 2046 | if (wbc->range_cyclic) { |
37c0eb46 | 2047 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
2048 | end = -1; |
2049 | } else { | |
2050 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
2051 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
2052 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
2053 | range_whole = true; |
2054 | scanned = true; | |
37c0eb46 SF |
2055 | } |
2056 | retry: | |
c3d17b63 JL |
2057 | while (!done && index <= end) { |
2058 | unsigned int i, nr_pages, found_pages; | |
66231a47 | 2059 | pgoff_t next = 0, tofind, saved_index = index; |
c3d17b63 JL |
2060 | |
2061 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
2062 | end - index) + 1; | |
2063 | ||
90ac1387 PS |
2064 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
2065 | &found_pages); | |
c3d17b63 JL |
2066 | if (!wdata) { |
2067 | rc = -ENOMEM; | |
2068 | break; | |
2069 | } | |
2070 | ||
c3d17b63 JL |
2071 | if (found_pages == 0) { |
2072 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2073 | break; | |
2074 | } | |
2075 | ||
7e48ff82 PS |
2076 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
2077 | end, &index, &next, &done); | |
37c0eb46 | 2078 | |
c3d17b63 JL |
2079 | /* nothing to write? */ |
2080 | if (nr_pages == 0) { | |
2081 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2082 | continue; | |
37c0eb46 | 2083 | } |
fbec9ab9 | 2084 | |
619aa48e | 2085 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); |
f3983c21 | 2086 | |
c3d17b63 JL |
2087 | /* send failure -- clean up the mess */ |
2088 | if (rc != 0) { | |
2089 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2090 | if (rc == -EAGAIN) |
c3d17b63 JL |
2091 | redirty_page_for_writepage(wbc, |
2092 | wdata->pages[i]); | |
2093 | else | |
2094 | SetPageError(wdata->pages[i]); | |
2095 | end_page_writeback(wdata->pages[i]); | |
2096 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2097 | } |
941b853d JL |
2098 | if (rc != -EAGAIN) |
2099 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2100 | } |
2101 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2102 | |
66231a47 PS |
2103 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
2104 | index = saved_index; | |
2105 | continue; | |
2106 | } | |
2107 | ||
c3d17b63 JL |
2108 | wbc->nr_to_write -= nr_pages; |
2109 | if (wbc->nr_to_write <= 0) | |
2110 | done = true; | |
b066a48c | 2111 | |
c3d17b63 | 2112 | index = next; |
37c0eb46 | 2113 | } |
c3d17b63 | 2114 | |
37c0eb46 SF |
2115 | if (!scanned && !done) { |
2116 | /* | |
2117 | * We hit the last page and there is more work to be done: wrap | |
2118 | * back to the start of the file | |
2119 | */ | |
c3d17b63 | 2120 | scanned = true; |
37c0eb46 SF |
2121 | index = 0; |
2122 | goto retry; | |
2123 | } | |
c3d17b63 | 2124 | |
111ebb6e | 2125 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2126 | mapping->writeback_index = index; |
2127 | ||
1da177e4 LT |
2128 | return rc; |
2129 | } | |
1da177e4 | 2130 | |
9ad1506b PS |
2131 | static int |
2132 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2133 | { |
9ad1506b | 2134 | int rc; |
6d5786a3 | 2135 | unsigned int xid; |
1da177e4 | 2136 | |
6d5786a3 | 2137 | xid = get_xid(); |
1da177e4 LT |
2138 | /* BB add check for wbc flags */ |
2139 | page_cache_get(page); | |
ad7a2926 | 2140 | if (!PageUptodate(page)) |
f96637be | 2141 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2142 | |
2143 | /* | |
2144 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2145 | * | |
2146 | * A writepage() implementation always needs to do either this, | |
2147 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2148 | * the case of a failure. | |
2149 | * | |
2150 | * Just unlocking the page will cause the radix tree tag-bits | |
2151 | * to fail to update with the state of the page correctly. | |
2152 | */ | |
fb8c4b14 | 2153 | set_page_writeback(page); |
9ad1506b | 2154 | retry_write: |
1da177e4 | 2155 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2156 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2157 | goto retry_write; | |
2158 | else if (rc == -EAGAIN) | |
2159 | redirty_page_for_writepage(wbc, page); | |
2160 | else if (rc != 0) | |
2161 | SetPageError(page); | |
2162 | else | |
2163 | SetPageUptodate(page); | |
cb876f45 LT |
2164 | end_page_writeback(page); |
2165 | page_cache_release(page); | |
6d5786a3 | 2166 | free_xid(xid); |
1da177e4 LT |
2167 | return rc; |
2168 | } | |
2169 | ||
9ad1506b PS |
2170 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2171 | { | |
2172 | int rc = cifs_writepage_locked(page, wbc); | |
2173 | unlock_page(page); | |
2174 | return rc; | |
2175 | } | |
2176 | ||
d9414774 NP |
2177 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2178 | loff_t pos, unsigned len, unsigned copied, | |
2179 | struct page *page, void *fsdata) | |
1da177e4 | 2180 | { |
d9414774 NP |
2181 | int rc; |
2182 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2183 | struct cifsFileInfo *cfile = file->private_data; |
2184 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2185 | __u32 pid; | |
2186 | ||
2187 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2188 | pid = cfile->pid; | |
2189 | else | |
2190 | pid = current->tgid; | |
1da177e4 | 2191 | |
f96637be | 2192 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2193 | page, pos, copied); |
d9414774 | 2194 | |
a98ee8c1 JL |
2195 | if (PageChecked(page)) { |
2196 | if (copied == len) | |
2197 | SetPageUptodate(page); | |
2198 | ClearPageChecked(page); | |
2199 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2200 | SetPageUptodate(page); |
ad7a2926 | 2201 | |
1da177e4 | 2202 | if (!PageUptodate(page)) { |
d9414774 NP |
2203 | char *page_data; |
2204 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2205 | unsigned int xid; |
d9414774 | 2206 | |
6d5786a3 | 2207 | xid = get_xid(); |
1da177e4 LT |
2208 | /* this is probably better than directly calling |
2209 | partialpage_write since in this function the file handle is | |
2210 | known which we might as well leverage */ | |
2211 | /* BB check if anything else missing out of ppw | |
2212 | such as updating last write time */ | |
2213 | page_data = kmap(page); | |
d4ffff1f | 2214 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2215 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2216 | kunmap(page); |
d9414774 | 2217 | |
6d5786a3 | 2218 | free_xid(xid); |
fb8c4b14 | 2219 | } else { |
d9414774 NP |
2220 | rc = copied; |
2221 | pos += copied; | |
ca8aa29c | 2222 | set_page_dirty(page); |
1da177e4 LT |
2223 | } |
2224 | ||
d9414774 NP |
2225 | if (rc > 0) { |
2226 | spin_lock(&inode->i_lock); | |
2227 | if (pos > inode->i_size) | |
2228 | i_size_write(inode, pos); | |
2229 | spin_unlock(&inode->i_lock); | |
2230 | } | |
2231 | ||
2232 | unlock_page(page); | |
2233 | page_cache_release(page); | |
2234 | ||
1da177e4 LT |
2235 | return rc; |
2236 | } | |
2237 | ||
02c24a82 JB |
2238 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2239 | int datasync) | |
1da177e4 | 2240 | { |
6d5786a3 | 2241 | unsigned int xid; |
1da177e4 | 2242 | int rc = 0; |
96daf2b0 | 2243 | struct cifs_tcon *tcon; |
1d8c4c00 | 2244 | struct TCP_Server_Info *server; |
c21dfb69 | 2245 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2246 | struct inode *inode = file_inode(file); |
8be7e6ba | 2247 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2248 | |
02c24a82 JB |
2249 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2250 | if (rc) | |
2251 | return rc; | |
2252 | mutex_lock(&inode->i_mutex); | |
2253 | ||
6d5786a3 | 2254 | xid = get_xid(); |
1da177e4 | 2255 | |
f96637be JP |
2256 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2257 | file->f_path.dentry->d_name.name, datasync); | |
50c2f753 | 2258 | |
18cceb6a | 2259 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 2260 | rc = cifs_zap_mapping(inode); |
6feb9891 | 2261 | if (rc) { |
f96637be | 2262 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2263 | rc = 0; /* don't care about it in fsync */ |
2264 | } | |
2265 | } | |
eb4b756b | 2266 | |
8be7e6ba | 2267 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2268 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2269 | server = tcon->ses->server; | |
2270 | if (server->ops->flush) | |
2271 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2272 | else | |
2273 | rc = -ENOSYS; | |
2274 | } | |
8be7e6ba | 2275 | |
6d5786a3 | 2276 | free_xid(xid); |
02c24a82 | 2277 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2278 | return rc; |
2279 | } | |
2280 | ||
02c24a82 | 2281 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2282 | { |
6d5786a3 | 2283 | unsigned int xid; |
8be7e6ba | 2284 | int rc = 0; |
96daf2b0 | 2285 | struct cifs_tcon *tcon; |
1d8c4c00 | 2286 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2287 | struct cifsFileInfo *smbfile = file->private_data; |
2288 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2289 | struct inode *inode = file->f_mapping->host; |
2290 | ||
2291 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2292 | if (rc) | |
2293 | return rc; | |
2294 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2295 | |
6d5786a3 | 2296 | xid = get_xid(); |
8be7e6ba | 2297 | |
f96637be JP |
2298 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2299 | file->f_path.dentry->d_name.name, datasync); | |
8be7e6ba PS |
2300 | |
2301 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2302 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2303 | server = tcon->ses->server; | |
2304 | if (server->ops->flush) | |
2305 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2306 | else | |
2307 | rc = -ENOSYS; | |
2308 | } | |
b298f223 | 2309 | |
6d5786a3 | 2310 | free_xid(xid); |
02c24a82 | 2311 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2312 | return rc; |
2313 | } | |
2314 | ||
1da177e4 LT |
2315 | /* |
2316 | * As file closes, flush all cached write data for this inode checking | |
2317 | * for write behind errors. | |
2318 | */ | |
75e1fcc0 | 2319 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2320 | { |
496ad9aa | 2321 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2322 | int rc = 0; |
2323 | ||
eb4b756b | 2324 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2325 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2326 | |
f96637be | 2327 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2328 | |
2329 | return rc; | |
2330 | } | |
2331 | ||
72432ffc PS |
2332 | static int |
2333 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2334 | { | |
2335 | int rc = 0; | |
2336 | unsigned long i; | |
2337 | ||
2338 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2339 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2340 | if (!pages[i]) { |
2341 | /* | |
2342 | * save number of pages we have already allocated and | |
2343 | * return with ENOMEM error | |
2344 | */ | |
2345 | num_pages = i; | |
2346 | rc = -ENOMEM; | |
e94f7ba1 | 2347 | break; |
72432ffc PS |
2348 | } |
2349 | } | |
2350 | ||
e94f7ba1 JL |
2351 | if (rc) { |
2352 | for (i = 0; i < num_pages; i++) | |
2353 | put_page(pages[i]); | |
2354 | } | |
72432ffc PS |
2355 | return rc; |
2356 | } | |
2357 | ||
2358 | static inline | |
2359 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2360 | { | |
2361 | size_t num_pages; | |
2362 | size_t clen; | |
2363 | ||
2364 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2365 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2366 | |
2367 | if (cur_len) | |
2368 | *cur_len = clen; | |
2369 | ||
2370 | return num_pages; | |
2371 | } | |
2372 | ||
da82f7e7 | 2373 | static void |
4a5c80d7 | 2374 | cifs_uncached_writedata_release(struct kref *refcount) |
da82f7e7 JL |
2375 | { |
2376 | int i; | |
4a5c80d7 SF |
2377 | struct cifs_writedata *wdata = container_of(refcount, |
2378 | struct cifs_writedata, refcount); | |
2379 | ||
2380 | for (i = 0; i < wdata->nr_pages; i++) | |
2381 | put_page(wdata->pages[i]); | |
2382 | cifs_writedata_release(refcount); | |
2383 | } | |
2384 | ||
2385 | static void | |
2386 | cifs_uncached_writev_complete(struct work_struct *work) | |
2387 | { | |
da82f7e7 JL |
2388 | struct cifs_writedata *wdata = container_of(work, |
2389 | struct cifs_writedata, work); | |
2390 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2391 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2392 | ||
2393 | spin_lock(&inode->i_lock); | |
2394 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2395 | if (cifsi->server_eof > inode->i_size) | |
2396 | i_size_write(inode, cifsi->server_eof); | |
2397 | spin_unlock(&inode->i_lock); | |
2398 | ||
2399 | complete(&wdata->done); | |
2400 | ||
4a5c80d7 | 2401 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
da82f7e7 JL |
2402 | } |
2403 | ||
2404 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2405 | static int | |
2406 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2407 | { | |
2408 | int rc; | |
c9de5c80 PS |
2409 | struct TCP_Server_Info *server; |
2410 | ||
2411 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2412 | |
2413 | do { | |
2414 | if (wdata->cfile->invalidHandle) { | |
2415 | rc = cifs_reopen_file(wdata->cfile, false); | |
2416 | if (rc != 0) | |
2417 | continue; | |
2418 | } | |
4a5c80d7 SF |
2419 | rc = server->ops->async_writev(wdata, |
2420 | cifs_uncached_writedata_release); | |
da82f7e7 JL |
2421 | } while (rc == -EAGAIN); |
2422 | ||
2423 | return rc; | |
2424 | } | |
2425 | ||
72432ffc | 2426 | static ssize_t |
3dae8750 | 2427 | cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset) |
72432ffc | 2428 | { |
da82f7e7 | 2429 | unsigned long nr_pages, i; |
5d81de8e | 2430 | size_t bytes, copied, len, cur_len; |
76429c14 | 2431 | ssize_t total_written = 0; |
3af9d8f2 | 2432 | loff_t offset; |
72432ffc | 2433 | struct cifsFileInfo *open_file; |
da82f7e7 | 2434 | struct cifs_tcon *tcon; |
72432ffc | 2435 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2436 | struct cifs_writedata *wdata, *tmp; |
2437 | struct list_head wdata_list; | |
2438 | int rc; | |
2439 | pid_t pid; | |
72432ffc | 2440 | |
3dae8750 | 2441 | len = iov_iter_count(from); |
72432ffc PS |
2442 | rc = generic_write_checks(file, poffset, &len, 0); |
2443 | if (rc) | |
2444 | return rc; | |
2445 | ||
3dae8750 AV |
2446 | if (!len) |
2447 | return 0; | |
2448 | ||
2449 | iov_iter_truncate(from, len); | |
2450 | ||
da82f7e7 | 2451 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2452 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2453 | open_file = file->private_data; |
da82f7e7 | 2454 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2455 | |
2456 | if (!tcon->ses->server->ops->async_writev) | |
2457 | return -ENOSYS; | |
2458 | ||
3af9d8f2 | 2459 | offset = *poffset; |
d4ffff1f PS |
2460 | |
2461 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2462 | pid = open_file->pid; | |
2463 | else | |
2464 | pid = current->tgid; | |
2465 | ||
72432ffc | 2466 | do { |
da82f7e7 JL |
2467 | size_t save_len; |
2468 | ||
2469 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2470 | wdata = cifs_writedata_alloc(nr_pages, | |
2471 | cifs_uncached_writev_complete); | |
2472 | if (!wdata) { | |
2473 | rc = -ENOMEM; | |
2474 | break; | |
2475 | } | |
2476 | ||
2477 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2478 | if (rc) { | |
2479 | kfree(wdata); | |
2480 | break; | |
2481 | } | |
2482 | ||
2483 | save_len = cur_len; | |
2484 | for (i = 0; i < nr_pages; i++) { | |
e7c24607 AV |
2485 | bytes = min_t(size_t, cur_len, PAGE_SIZE); |
2486 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, | |
3dae8750 | 2487 | from); |
72432ffc | 2488 | cur_len -= copied; |
5d81de8e JL |
2489 | /* |
2490 | * If we didn't copy as much as we expected, then that | |
2491 | * may mean we trod into an unmapped area. Stop copying | |
2492 | * at that point. On the next pass through the big | |
2493 | * loop, we'll likely end up getting a zero-length | |
2494 | * write and bailing out of it. | |
2495 | */ | |
2496 | if (copied < bytes) | |
2497 | break; | |
72432ffc | 2498 | } |
72432ffc PS |
2499 | cur_len = save_len - cur_len; |
2500 | ||
5d81de8e JL |
2501 | /* |
2502 | * If we have no data to send, then that probably means that | |
2503 | * the copy above failed altogether. That's most likely because | |
2504 | * the address in the iovec was bogus. Set the rc to -EFAULT, | |
2505 | * free anything we allocated and bail out. | |
2506 | */ | |
2507 | if (!cur_len) { | |
2508 | for (i = 0; i < nr_pages; i++) | |
2509 | put_page(wdata->pages[i]); | |
2510 | kfree(wdata); | |
2511 | rc = -EFAULT; | |
2512 | break; | |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * i + 1 now represents the number of pages we actually used in | |
2517 | * the copy phase above. Bring nr_pages down to that, and free | |
2518 | * any pages that we didn't use. | |
2519 | */ | |
2520 | for ( ; nr_pages > i + 1; nr_pages--) | |
2521 | put_page(wdata->pages[nr_pages - 1]); | |
2522 | ||
da82f7e7 JL |
2523 | wdata->sync_mode = WB_SYNC_ALL; |
2524 | wdata->nr_pages = nr_pages; | |
2525 | wdata->offset = (__u64)offset; | |
2526 | wdata->cfile = cifsFileInfo_get(open_file); | |
2527 | wdata->pid = pid; | |
2528 | wdata->bytes = cur_len; | |
eddb079d JL |
2529 | wdata->pagesz = PAGE_SIZE; |
2530 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2531 | rc = cifs_uncached_retry_writev(wdata); |
2532 | if (rc) { | |
4a5c80d7 SF |
2533 | kref_put(&wdata->refcount, |
2534 | cifs_uncached_writedata_release); | |
72432ffc PS |
2535 | break; |
2536 | } | |
2537 | ||
da82f7e7 JL |
2538 | list_add_tail(&wdata->list, &wdata_list); |
2539 | offset += cur_len; | |
2540 | len -= cur_len; | |
72432ffc PS |
2541 | } while (len > 0); |
2542 | ||
da82f7e7 JL |
2543 | /* |
2544 | * If at least one write was successfully sent, then discard any rc | |
2545 | * value from the later writes. If the other write succeeds, then | |
2546 | * we'll end up returning whatever was written. If it fails, then | |
2547 | * we'll get a new rc value from that. | |
2548 | */ | |
2549 | if (!list_empty(&wdata_list)) | |
2550 | rc = 0; | |
2551 | ||
2552 | /* | |
2553 | * Wait for and collect replies for any successful sends in order of | |
2554 | * increasing offset. Once an error is hit or we get a fatal signal | |
2555 | * while waiting, then return without waiting for any more replies. | |
2556 | */ | |
2557 | restart_loop: | |
2558 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2559 | if (!rc) { | |
2560 | /* FIXME: freezable too? */ | |
2561 | rc = wait_for_completion_killable(&wdata->done); | |
2562 | if (rc) | |
2563 | rc = -EINTR; | |
2564 | else if (wdata->result) | |
2565 | rc = wdata->result; | |
2566 | else | |
2567 | total_written += wdata->bytes; | |
2568 | ||
2569 | /* resend call if it's a retryable error */ | |
2570 | if (rc == -EAGAIN) { | |
2571 | rc = cifs_uncached_retry_writev(wdata); | |
2572 | goto restart_loop; | |
2573 | } | |
2574 | } | |
2575 | list_del_init(&wdata->list); | |
4a5c80d7 | 2576 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
72432ffc PS |
2577 | } |
2578 | ||
da82f7e7 JL |
2579 | if (total_written > 0) |
2580 | *poffset += total_written; | |
72432ffc | 2581 | |
da82f7e7 JL |
2582 | cifs_stats_bytes_written(tcon, total_written); |
2583 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2584 | } |
2585 | ||
3dae8750 | 2586 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc PS |
2587 | { |
2588 | ssize_t written; | |
2589 | struct inode *inode; | |
3dae8750 | 2590 | loff_t pos = iocb->ki_pos; |
72432ffc | 2591 | |
496ad9aa | 2592 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2593 | |
2594 | /* | |
2595 | * BB - optimize the way when signing is disabled. We can drop this | |
2596 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2597 | * write request. | |
2598 | */ | |
2599 | ||
3dae8750 | 2600 | written = cifs_iovec_write(iocb->ki_filp, from, &pos); |
72432ffc | 2601 | if (written > 0) { |
aff8d5ca | 2602 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags); |
72432ffc PS |
2603 | iocb->ki_pos = pos; |
2604 | } | |
2605 | ||
2606 | return written; | |
2607 | } | |
2608 | ||
579f9053 | 2609 | static ssize_t |
3dae8750 | 2610 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc | 2611 | { |
579f9053 PS |
2612 | struct file *file = iocb->ki_filp; |
2613 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2614 | struct inode *inode = file->f_mapping->host; | |
2615 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2616 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2617 | ssize_t rc = -EACCES; | |
19dfc1f5 | 2618 | loff_t lock_pos = iocb->ki_pos; |
72432ffc | 2619 | |
579f9053 PS |
2620 | /* |
2621 | * We need to hold the sem to be sure nobody modifies lock list | |
2622 | * with a brlock that prevents writing. | |
2623 | */ | |
2624 | down_read(&cinode->lock_sem); | |
19dfc1f5 AV |
2625 | mutex_lock(&inode->i_mutex); |
2626 | if (file->f_flags & O_APPEND) | |
2627 | lock_pos = i_size_read(inode); | |
3dae8750 | 2628 | if (!cifs_find_lock_conflict(cfile, lock_pos, iov_iter_count(from), |
579f9053 | 2629 | server->vals->exclusive_lock_type, NULL, |
19dfc1f5 | 2630 | CIFS_WRITE_OP)) { |
3dae8750 | 2631 | rc = __generic_file_write_iter(iocb, from); |
19dfc1f5 AV |
2632 | mutex_unlock(&inode->i_mutex); |
2633 | ||
2634 | if (rc > 0) { | |
2635 | ssize_t err; | |
2636 | ||
2637 | err = generic_write_sync(file, iocb->ki_pos - rc, rc); | |
1f80c0cc | 2638 | if (err < 0) |
19dfc1f5 AV |
2639 | rc = err; |
2640 | } | |
2641 | } else { | |
2642 | mutex_unlock(&inode->i_mutex); | |
2643 | } | |
579f9053 | 2644 | up_read(&cinode->lock_sem); |
579f9053 PS |
2645 | return rc; |
2646 | } | |
2647 | ||
2648 | ssize_t | |
3dae8750 | 2649 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
579f9053 | 2650 | { |
496ad9aa | 2651 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2652 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2653 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2654 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2655 | iocb->ki_filp->private_data; | |
2656 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2657 | ssize_t written; |
ca8aa29c | 2658 | |
c11f1df5 SP |
2659 | written = cifs_get_writer(cinode); |
2660 | if (written) | |
2661 | return written; | |
2662 | ||
18cceb6a | 2663 | if (CIFS_CACHE_WRITE(cinode)) { |
88cf75aa PS |
2664 | if (cap_unix(tcon->ses) && |
2665 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
c11f1df5 | 2666 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
3dae8750 | 2667 | written = generic_file_write_iter(iocb, from); |
c11f1df5 SP |
2668 | goto out; |
2669 | } | |
3dae8750 | 2670 | written = cifs_writev(iocb, from); |
c11f1df5 | 2671 | goto out; |
25078105 | 2672 | } |
25078105 | 2673 | /* |
ca8aa29c PS |
2674 | * For non-oplocked files in strict cache mode we need to write the data |
2675 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2676 | * affected pages because it may cause a error with mandatory locks on | |
2677 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2678 | */ |
3dae8750 | 2679 | written = cifs_user_writev(iocb, from); |
18cceb6a | 2680 | if (written > 0 && CIFS_CACHE_READ(cinode)) { |
88cf75aa PS |
2681 | /* |
2682 | * Windows 7 server can delay breaking level2 oplock if a write | |
2683 | * request comes - break it on the client to prevent reading | |
2684 | * an old data. | |
2685 | */ | |
4f73c7d3 | 2686 | cifs_zap_mapping(inode); |
f96637be JP |
2687 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2688 | inode); | |
18cceb6a | 2689 | cinode->oplock = 0; |
88cf75aa | 2690 | } |
c11f1df5 SP |
2691 | out: |
2692 | cifs_put_writer(cinode); | |
88cf75aa | 2693 | return written; |
72432ffc PS |
2694 | } |
2695 | ||
0471ca3f | 2696 | static struct cifs_readdata * |
f4e49cd2 | 2697 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2698 | { |
2699 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2700 | |
c5fab6f4 JL |
2701 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2702 | GFP_KERNEL); | |
0471ca3f | 2703 | if (rdata != NULL) { |
6993f74a | 2704 | kref_init(&rdata->refcount); |
1c892549 JL |
2705 | INIT_LIST_HEAD(&rdata->list); |
2706 | init_completion(&rdata->done); | |
0471ca3f | 2707 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2708 | } |
f4e49cd2 | 2709 | |
0471ca3f JL |
2710 | return rdata; |
2711 | } | |
2712 | ||
6993f74a JL |
2713 | void |
2714 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2715 | { |
6993f74a JL |
2716 | struct cifs_readdata *rdata = container_of(refcount, |
2717 | struct cifs_readdata, refcount); | |
2718 | ||
2719 | if (rdata->cfile) | |
2720 | cifsFileInfo_put(rdata->cfile); | |
2721 | ||
0471ca3f JL |
2722 | kfree(rdata); |
2723 | } | |
2724 | ||
1c892549 | 2725 | static int |
c5fab6f4 | 2726 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2727 | { |
2728 | int rc = 0; | |
c5fab6f4 | 2729 | struct page *page; |
1c892549 JL |
2730 | unsigned int i; |
2731 | ||
c5fab6f4 | 2732 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2733 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2734 | if (!page) { | |
2735 | rc = -ENOMEM; | |
2736 | break; | |
2737 | } | |
c5fab6f4 | 2738 | rdata->pages[i] = page; |
1c892549 JL |
2739 | } |
2740 | ||
2741 | if (rc) { | |
c5fab6f4 JL |
2742 | for (i = 0; i < nr_pages; i++) { |
2743 | put_page(rdata->pages[i]); | |
2744 | rdata->pages[i] = NULL; | |
1c892549 JL |
2745 | } |
2746 | } | |
2747 | return rc; | |
2748 | } | |
2749 | ||
2750 | static void | |
2751 | cifs_uncached_readdata_release(struct kref *refcount) | |
2752 | { | |
1c892549 JL |
2753 | struct cifs_readdata *rdata = container_of(refcount, |
2754 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2755 | unsigned int i; |
1c892549 | 2756 | |
c5fab6f4 JL |
2757 | for (i = 0; i < rdata->nr_pages; i++) { |
2758 | put_page(rdata->pages[i]); | |
2759 | rdata->pages[i] = NULL; | |
1c892549 JL |
2760 | } |
2761 | cifs_readdata_release(refcount); | |
2762 | } | |
2763 | ||
2a1bb138 JL |
2764 | static int |
2765 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2766 | { | |
2767 | int rc; | |
fc9c5966 PS |
2768 | struct TCP_Server_Info *server; |
2769 | ||
2770 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2771 | |
2772 | do { | |
2773 | if (rdata->cfile->invalidHandle) { | |
2774 | rc = cifs_reopen_file(rdata->cfile, true); | |
2775 | if (rc != 0) | |
2776 | continue; | |
2777 | } | |
fc9c5966 | 2778 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2779 | } while (rc == -EAGAIN); |
2780 | ||
2781 | return rc; | |
2782 | } | |
2783 | ||
1c892549 JL |
2784 | /** |
2785 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2786 | * @rdata: the readdata response with list of pages holding data | |
7f25bba8 | 2787 | * @iter: destination for our data |
1c892549 JL |
2788 | * |
2789 | * This function copies data from a list of pages in a readdata response into | |
2790 | * an array of iovecs. It will first calculate where the data should go | |
2791 | * based on the info in the readdata and then copy the data into that spot. | |
2792 | */ | |
7f25bba8 AV |
2793 | static int |
2794 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) | |
1c892549 | 2795 | { |
7f25bba8 | 2796 | size_t remaining = rdata->bytes; |
c5fab6f4 | 2797 | unsigned int i; |
1c892549 | 2798 | |
c5fab6f4 | 2799 | for (i = 0; i < rdata->nr_pages; i++) { |
c5fab6f4 | 2800 | struct page *page = rdata->pages[i]; |
e686bd8d | 2801 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
7f25bba8 AV |
2802 | size_t written = copy_page_to_iter(page, 0, copy, iter); |
2803 | remaining -= written; | |
2804 | if (written < copy && iov_iter_count(iter) > 0) | |
2805 | break; | |
1c892549 | 2806 | } |
7f25bba8 | 2807 | return remaining ? -EFAULT : 0; |
1c892549 JL |
2808 | } |
2809 | ||
2810 | static void | |
2811 | cifs_uncached_readv_complete(struct work_struct *work) | |
2812 | { | |
2813 | struct cifs_readdata *rdata = container_of(work, | |
2814 | struct cifs_readdata, work); | |
1c892549 JL |
2815 | |
2816 | complete(&rdata->done); | |
2817 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2818 | } | |
2819 | ||
2820 | static int | |
8321fec4 JL |
2821 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2822 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2823 | { |
8321fec4 | 2824 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2825 | unsigned int i; |
2826 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2827 | struct kvec iov; |
1c892549 | 2828 | |
8321fec4 | 2829 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2830 | for (i = 0; i < nr_pages; i++) { |
2831 | struct page *page = rdata->pages[i]; | |
2832 | ||
8321fec4 | 2833 | if (len >= PAGE_SIZE) { |
1c892549 | 2834 | /* enough data to fill the page */ |
8321fec4 JL |
2835 | iov.iov_base = kmap(page); |
2836 | iov.iov_len = PAGE_SIZE; | |
f96637be JP |
2837 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2838 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2839 | len -= PAGE_SIZE; |
2840 | } else if (len > 0) { | |
1c892549 | 2841 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2842 | iov.iov_base = kmap(page); |
2843 | iov.iov_len = len; | |
f96637be JP |
2844 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2845 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2846 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); |
2847 | rdata->tailsz = len; | |
2848 | len = 0; | |
1c892549 JL |
2849 | } else { |
2850 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2851 | rdata->pages[i] = NULL; |
2852 | rdata->nr_pages--; | |
1c892549 | 2853 | put_page(page); |
8321fec4 | 2854 | continue; |
1c892549 | 2855 | } |
8321fec4 JL |
2856 | |
2857 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2858 | kunmap(page); | |
2859 | if (result < 0) | |
2860 | break; | |
2861 | ||
2862 | total_read += result; | |
1c892549 JL |
2863 | } |
2864 | ||
038bc961 | 2865 | return total_read > 0 && result != -EAGAIN ? total_read : result; |
1c892549 JL |
2866 | } |
2867 | ||
e6a7bcb4 | 2868 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) |
1da177e4 | 2869 | { |
0165e810 | 2870 | struct file *file = iocb->ki_filp; |
1c892549 | 2871 | ssize_t rc; |
a70307ee | 2872 | size_t len, cur_len; |
1c892549 | 2873 | ssize_t total_read = 0; |
e6a7bcb4 | 2874 | loff_t offset = iocb->ki_pos; |
1c892549 | 2875 | unsigned int npages; |
1da177e4 | 2876 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2877 | struct cifs_tcon *tcon; |
1da177e4 | 2878 | struct cifsFileInfo *open_file; |
1c892549 JL |
2879 | struct cifs_readdata *rdata, *tmp; |
2880 | struct list_head rdata_list; | |
2881 | pid_t pid; | |
a70307ee | 2882 | |
e6a7bcb4 | 2883 | len = iov_iter_count(to); |
a70307ee PS |
2884 | if (!len) |
2885 | return 0; | |
1da177e4 | 2886 | |
1c892549 | 2887 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2888 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2889 | open_file = file->private_data; |
1c892549 | 2890 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2891 | |
fc9c5966 PS |
2892 | if (!tcon->ses->server->ops->async_readv) |
2893 | return -ENOSYS; | |
2894 | ||
d4ffff1f PS |
2895 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2896 | pid = open_file->pid; | |
2897 | else | |
2898 | pid = current->tgid; | |
2899 | ||
ad7a2926 | 2900 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 2901 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
ad7a2926 | 2902 | |
1c892549 JL |
2903 | do { |
2904 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2905 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2906 | |
1c892549 JL |
2907 | /* allocate a readdata struct */ |
2908 | rdata = cifs_readdata_alloc(npages, | |
2909 | cifs_uncached_readv_complete); | |
2910 | if (!rdata) { | |
2911 | rc = -ENOMEM; | |
bae9f746 | 2912 | break; |
1da177e4 | 2913 | } |
a70307ee | 2914 | |
c5fab6f4 | 2915 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2916 | if (rc) |
2917 | goto error; | |
2918 | ||
2919 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2920 | rdata->nr_pages = npages; |
1c892549 JL |
2921 | rdata->offset = offset; |
2922 | rdata->bytes = cur_len; | |
2923 | rdata->pid = pid; | |
8321fec4 JL |
2924 | rdata->pagesz = PAGE_SIZE; |
2925 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2926 | |
2927 | rc = cifs_retry_async_readv(rdata); | |
2928 | error: | |
2929 | if (rc) { | |
2930 | kref_put(&rdata->refcount, | |
2931 | cifs_uncached_readdata_release); | |
2932 | break; | |
2933 | } | |
2934 | ||
2935 | list_add_tail(&rdata->list, &rdata_list); | |
2936 | offset += cur_len; | |
2937 | len -= cur_len; | |
2938 | } while (len > 0); | |
2939 | ||
2940 | /* if at least one read request send succeeded, then reset rc */ | |
2941 | if (!list_empty(&rdata_list)) | |
2942 | rc = 0; | |
2943 | ||
e6a7bcb4 | 2944 | len = iov_iter_count(to); |
1c892549 | 2945 | /* the loop below should proceed in the order of increasing offsets */ |
1c892549 | 2946 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { |
74027f4a | 2947 | again: |
1c892549 | 2948 | if (!rc) { |
1c892549 JL |
2949 | /* FIXME: freezable sleep too? */ |
2950 | rc = wait_for_completion_killable(&rdata->done); | |
2951 | if (rc) | |
2952 | rc = -EINTR; | |
74027f4a | 2953 | else if (rdata->result) { |
1c892549 | 2954 | rc = rdata->result; |
74027f4a AV |
2955 | /* resend call if it's a retryable error */ |
2956 | if (rc == -EAGAIN) { | |
2957 | rc = cifs_retry_async_readv(rdata); | |
2958 | goto again; | |
2959 | } | |
2960 | } else { | |
e6a7bcb4 | 2961 | rc = cifs_readdata_to_iov(rdata, to); |
1c892549 JL |
2962 | } |
2963 | ||
1da177e4 | 2964 | } |
1c892549 JL |
2965 | list_del_init(&rdata->list); |
2966 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2967 | } |
a70307ee | 2968 | |
e6a7bcb4 | 2969 | total_read = len - iov_iter_count(to); |
7f25bba8 | 2970 | |
1c892549 | 2971 | cifs_stats_bytes_read(tcon, total_read); |
1c892549 | 2972 | |
09a4707e PS |
2973 | /* mask nodata case */ |
2974 | if (rc == -ENODATA) | |
2975 | rc = 0; | |
2976 | ||
0165e810 | 2977 | if (total_read) { |
e6a7bcb4 | 2978 | iocb->ki_pos += total_read; |
0165e810 AV |
2979 | return total_read; |
2980 | } | |
2981 | return rc; | |
a70307ee PS |
2982 | } |
2983 | ||
579f9053 | 2984 | ssize_t |
e6a7bcb4 | 2985 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
a70307ee | 2986 | { |
496ad9aa | 2987 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2988 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2989 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2990 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2991 | iocb->ki_filp->private_data; | |
2992 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2993 | int rc = -EACCES; | |
a70307ee PS |
2994 | |
2995 | /* | |
2996 | * In strict cache mode we need to read from the server all the time | |
2997 | * if we don't have level II oplock because the server can delay mtime | |
2998 | * change - so we can't make a decision about inode invalidating. | |
2999 | * And we can also fail with pagereading if there are mandatory locks | |
3000 | * on pages affected by this read but not on the region from pos to | |
3001 | * pos+len-1. | |
3002 | */ | |
18cceb6a | 3003 | if (!CIFS_CACHE_READ(cinode)) |
e6a7bcb4 | 3004 | return cifs_user_readv(iocb, to); |
a70307ee | 3005 | |
579f9053 PS |
3006 | if (cap_unix(tcon->ses) && |
3007 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
3008 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
e6a7bcb4 | 3009 | return generic_file_read_iter(iocb, to); |
579f9053 PS |
3010 | |
3011 | /* | |
3012 | * We need to hold the sem to be sure nobody modifies lock list | |
3013 | * with a brlock that prevents reading. | |
3014 | */ | |
3015 | down_read(&cinode->lock_sem); | |
e6a7bcb4 | 3016 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
579f9053 | 3017 | tcon->ses->server->vals->shared_lock_type, |
081c0414 | 3018 | NULL, CIFS_READ_OP)) |
e6a7bcb4 | 3019 | rc = generic_file_read_iter(iocb, to); |
579f9053 PS |
3020 | up_read(&cinode->lock_sem); |
3021 | return rc; | |
a70307ee | 3022 | } |
1da177e4 | 3023 | |
f9c6e234 PS |
3024 | static ssize_t |
3025 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
3026 | { |
3027 | int rc = -EACCES; | |
3028 | unsigned int bytes_read = 0; | |
3029 | unsigned int total_read; | |
3030 | unsigned int current_read_size; | |
5eba8ab3 | 3031 | unsigned int rsize; |
1da177e4 | 3032 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 3033 | struct cifs_tcon *tcon; |
f9c6e234 | 3034 | struct TCP_Server_Info *server; |
6d5786a3 | 3035 | unsigned int xid; |
f9c6e234 | 3036 | char *cur_offset; |
1da177e4 | 3037 | struct cifsFileInfo *open_file; |
d4ffff1f | 3038 | struct cifs_io_parms io_parms; |
ec637e3f | 3039 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 3040 | __u32 pid; |
1da177e4 | 3041 | |
6d5786a3 | 3042 | xid = get_xid(); |
e6a00296 | 3043 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 3044 | |
5eba8ab3 JL |
3045 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3046 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3047 | ||
1da177e4 | 3048 | if (file->private_data == NULL) { |
0f3bc09e | 3049 | rc = -EBADF; |
6d5786a3 | 3050 | free_xid(xid); |
0f3bc09e | 3051 | return rc; |
1da177e4 | 3052 | } |
c21dfb69 | 3053 | open_file = file->private_data; |
29e20f9c | 3054 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3055 | server = tcon->ses->server; |
3056 | ||
3057 | if (!server->ops->sync_read) { | |
3058 | free_xid(xid); | |
3059 | return -ENOSYS; | |
3060 | } | |
1da177e4 | 3061 | |
d4ffff1f PS |
3062 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3063 | pid = open_file->pid; | |
3064 | else | |
3065 | pid = current->tgid; | |
3066 | ||
1da177e4 | 3067 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3068 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3069 | |
f9c6e234 PS |
3070 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3071 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3072 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3073 | /* |
3074 | * For windows me and 9x we do not want to request more than it | |
3075 | * negotiated since it will refuse the read then. | |
3076 | */ | |
3077 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3078 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3079 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3080 | CIFSMaxBufSize); |
f9f5c817 | 3081 | } |
1da177e4 LT |
3082 | rc = -EAGAIN; |
3083 | while (rc == -EAGAIN) { | |
cdff08e7 | 3084 | if (open_file->invalidHandle) { |
15886177 | 3085 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3086 | if (rc != 0) |
3087 | break; | |
3088 | } | |
d4ffff1f | 3089 | io_parms.pid = pid; |
29e20f9c | 3090 | io_parms.tcon = tcon; |
f9c6e234 | 3091 | io_parms.offset = *offset; |
d4ffff1f | 3092 | io_parms.length = current_read_size; |
f9c6e234 PS |
3093 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3094 | &bytes_read, &cur_offset, | |
3095 | &buf_type); | |
1da177e4 LT |
3096 | } |
3097 | if (rc || (bytes_read == 0)) { | |
3098 | if (total_read) { | |
3099 | break; | |
3100 | } else { | |
6d5786a3 | 3101 | free_xid(xid); |
1da177e4 LT |
3102 | return rc; |
3103 | } | |
3104 | } else { | |
29e20f9c | 3105 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3106 | *offset += bytes_read; |
1da177e4 LT |
3107 | } |
3108 | } | |
6d5786a3 | 3109 | free_xid(xid); |
1da177e4 LT |
3110 | return total_read; |
3111 | } | |
3112 | ||
ca83ce3d JL |
3113 | /* |
3114 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3115 | * sure that it doesn't change while being written back. | |
3116 | */ | |
3117 | static int | |
3118 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3119 | { | |
3120 | struct page *page = vmf->page; | |
3121 | ||
3122 | lock_page(page); | |
3123 | return VM_FAULT_LOCKED; | |
3124 | } | |
3125 | ||
3126 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3127 | .fault = filemap_fault, | |
f1820361 | 3128 | .map_pages = filemap_map_pages, |
ca83ce3d | 3129 | .page_mkwrite = cifs_page_mkwrite, |
0b173bc4 | 3130 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3131 | }; |
3132 | ||
7a6a19b1 PS |
3133 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3134 | { | |
3135 | int rc, xid; | |
496ad9aa | 3136 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3137 | |
6d5786a3 | 3138 | xid = get_xid(); |
7a6a19b1 | 3139 | |
18cceb6a | 3140 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 3141 | rc = cifs_zap_mapping(inode); |
6feb9891 PS |
3142 | if (rc) |
3143 | return rc; | |
3144 | } | |
7a6a19b1 PS |
3145 | |
3146 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3147 | if (rc == 0) |
3148 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3149 | free_xid(xid); |
7a6a19b1 PS |
3150 | return rc; |
3151 | } | |
3152 | ||
1da177e4 LT |
3153 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3154 | { | |
1da177e4 LT |
3155 | int rc, xid; |
3156 | ||
6d5786a3 | 3157 | xid = get_xid(); |
abab095d | 3158 | rc = cifs_revalidate_file(file); |
1da177e4 | 3159 | if (rc) { |
f96637be JP |
3160 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3161 | rc); | |
6d5786a3 | 3162 | free_xid(xid); |
1da177e4 LT |
3163 | return rc; |
3164 | } | |
3165 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3166 | if (rc == 0) |
3167 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3168 | free_xid(xid); |
1da177e4 LT |
3169 | return rc; |
3170 | } | |
3171 | ||
0471ca3f JL |
3172 | static void |
3173 | cifs_readv_complete(struct work_struct *work) | |
3174 | { | |
c5fab6f4 | 3175 | unsigned int i; |
0471ca3f JL |
3176 | struct cifs_readdata *rdata = container_of(work, |
3177 | struct cifs_readdata, work); | |
0471ca3f | 3178 | |
c5fab6f4 JL |
3179 | for (i = 0; i < rdata->nr_pages; i++) { |
3180 | struct page *page = rdata->pages[i]; | |
3181 | ||
0471ca3f JL |
3182 | lru_cache_add_file(page); |
3183 | ||
3184 | if (rdata->result == 0) { | |
0471ca3f JL |
3185 | flush_dcache_page(page); |
3186 | SetPageUptodate(page); | |
3187 | } | |
3188 | ||
3189 | unlock_page(page); | |
3190 | ||
3191 | if (rdata->result == 0) | |
3192 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3193 | ||
3194 | page_cache_release(page); | |
c5fab6f4 | 3195 | rdata->pages[i] = NULL; |
0471ca3f | 3196 | } |
6993f74a | 3197 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3198 | } |
3199 | ||
8d5ce4d2 | 3200 | static int |
8321fec4 JL |
3201 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3202 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3203 | { |
8321fec4 | 3204 | int total_read = 0, result = 0; |
c5fab6f4 | 3205 | unsigned int i; |
8d5ce4d2 JL |
3206 | u64 eof; |
3207 | pgoff_t eof_index; | |
c5fab6f4 | 3208 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3209 | struct kvec iov; |
8d5ce4d2 JL |
3210 | |
3211 | /* determine the eof that the server (probably) has */ | |
3212 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3213 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
f96637be | 3214 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3215 | |
8321fec4 | 3216 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3217 | for (i = 0; i < nr_pages; i++) { |
3218 | struct page *page = rdata->pages[i]; | |
3219 | ||
8321fec4 | 3220 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3221 | /* enough data to fill the page */ |
8321fec4 JL |
3222 | iov.iov_base = kmap(page); |
3223 | iov.iov_len = PAGE_CACHE_SIZE; | |
f96637be JP |
3224 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3225 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3226 | len -= PAGE_CACHE_SIZE; |
3227 | } else if (len > 0) { | |
8d5ce4d2 | 3228 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3229 | iov.iov_base = kmap(page); |
3230 | iov.iov_len = len; | |
f96637be JP |
3231 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3232 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3233 | memset(iov.iov_base + len, |
3234 | '\0', PAGE_CACHE_SIZE - len); | |
3235 | rdata->tailsz = len; | |
3236 | len = 0; | |
8d5ce4d2 JL |
3237 | } else if (page->index > eof_index) { |
3238 | /* | |
3239 | * The VFS will not try to do readahead past the | |
3240 | * i_size, but it's possible that we have outstanding | |
3241 | * writes with gaps in the middle and the i_size hasn't | |
3242 | * caught up yet. Populate those with zeroed out pages | |
3243 | * to prevent the VFS from repeatedly attempting to | |
3244 | * fill them until the writes are flushed. | |
3245 | */ | |
3246 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3247 | lru_cache_add_file(page); |
3248 | flush_dcache_page(page); | |
3249 | SetPageUptodate(page); | |
3250 | unlock_page(page); | |
3251 | page_cache_release(page); | |
c5fab6f4 JL |
3252 | rdata->pages[i] = NULL; |
3253 | rdata->nr_pages--; | |
8321fec4 | 3254 | continue; |
8d5ce4d2 JL |
3255 | } else { |
3256 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3257 | lru_cache_add_file(page); |
3258 | unlock_page(page); | |
3259 | page_cache_release(page); | |
c5fab6f4 JL |
3260 | rdata->pages[i] = NULL; |
3261 | rdata->nr_pages--; | |
8321fec4 | 3262 | continue; |
8d5ce4d2 | 3263 | } |
8321fec4 JL |
3264 | |
3265 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3266 | kunmap(page); | |
3267 | if (result < 0) | |
3268 | break; | |
3269 | ||
3270 | total_read += result; | |
8d5ce4d2 JL |
3271 | } |
3272 | ||
038bc961 | 3273 | return total_read > 0 && result != -EAGAIN ? total_read : result; |
8d5ce4d2 JL |
3274 | } |
3275 | ||
1da177e4 LT |
3276 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3277 | struct list_head *page_list, unsigned num_pages) | |
3278 | { | |
690c5e31 JL |
3279 | int rc; |
3280 | struct list_head tmplist; | |
3281 | struct cifsFileInfo *open_file = file->private_data; | |
3282 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3283 | unsigned int rsize = cifs_sb->rsize; | |
3284 | pid_t pid; | |
1da177e4 | 3285 | |
690c5e31 JL |
3286 | /* |
3287 | * Give up immediately if rsize is too small to read an entire page. | |
3288 | * The VFS will fall back to readpage. We should never reach this | |
3289 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3290 | * than a cache page. | |
3291 | */ | |
3292 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3293 | return 0; | |
bfa0d75a | 3294 | |
56698236 SJ |
3295 | /* |
3296 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3297 | * immediately if the cookie is negative | |
54afa990 DH |
3298 | * |
3299 | * After this point, every page in the list might have PG_fscache set, | |
3300 | * so we will need to clean that up off of every page we don't use. | |
56698236 SJ |
3301 | */ |
3302 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3303 | &num_pages); | |
3304 | if (rc == 0) | |
690c5e31 | 3305 | return rc; |
56698236 | 3306 | |
d4ffff1f PS |
3307 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3308 | pid = open_file->pid; | |
3309 | else | |
3310 | pid = current->tgid; | |
3311 | ||
690c5e31 JL |
3312 | rc = 0; |
3313 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3314 | |
f96637be JP |
3315 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3316 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3317 | |
3318 | /* | |
3319 | * Start with the page at end of list and move it to private | |
3320 | * list. Do the same with any following pages until we hit | |
3321 | * the rsize limit, hit an index discontinuity, or run out of | |
3322 | * pages. Issue the async read and then start the loop again | |
3323 | * until the list is empty. | |
3324 | * | |
3325 | * Note that list order is important. The page_list is in | |
3326 | * the order of declining indexes. When we put the pages in | |
3327 | * the rdata->pages, then we want them in increasing order. | |
3328 | */ | |
3329 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3330 | unsigned int i; |
690c5e31 JL |
3331 | unsigned int bytes = PAGE_CACHE_SIZE; |
3332 | unsigned int expected_index; | |
3333 | unsigned int nr_pages = 1; | |
3334 | loff_t offset; | |
3335 | struct page *page, *tpage; | |
3336 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3337 | |
3338 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3339 | |
3340 | /* | |
3341 | * Lock the page and put it in the cache. Since no one else | |
3342 | * should have access to this page, we're safe to simply set | |
3343 | * PG_locked without checking it first. | |
3344 | */ | |
3345 | __set_page_locked(page); | |
3346 | rc = add_to_page_cache_locked(page, mapping, | |
3347 | page->index, GFP_KERNEL); | |
3348 | ||
3349 | /* give up if we can't stick it in the cache */ | |
3350 | if (rc) { | |
3351 | __clear_page_locked(page); | |
3352 | break; | |
3353 | } | |
3354 | ||
3355 | /* move first page to the tmplist */ | |
1da177e4 | 3356 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3357 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3358 | |
690c5e31 JL |
3359 | /* now try and add more pages onto the request */ |
3360 | expected_index = page->index + 1; | |
3361 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3362 | /* discontinuity ? */ | |
3363 | if (page->index != expected_index) | |
fb8c4b14 | 3364 | break; |
690c5e31 JL |
3365 | |
3366 | /* would this page push the read over the rsize? */ | |
3367 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3368 | break; | |
3369 | ||
3370 | __set_page_locked(page); | |
3371 | if (add_to_page_cache_locked(page, mapping, | |
3372 | page->index, GFP_KERNEL)) { | |
3373 | __clear_page_locked(page); | |
3374 | break; | |
3375 | } | |
3376 | list_move_tail(&page->lru, &tmplist); | |
3377 | bytes += PAGE_CACHE_SIZE; | |
3378 | expected_index++; | |
3379 | nr_pages++; | |
1da177e4 | 3380 | } |
690c5e31 | 3381 | |
0471ca3f | 3382 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3383 | if (!rdata) { |
3384 | /* best to give up if we're out of mem */ | |
3385 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3386 | list_del(&page->lru); | |
3387 | lru_cache_add_file(page); | |
3388 | unlock_page(page); | |
3389 | page_cache_release(page); | |
3390 | } | |
3391 | rc = -ENOMEM; | |
3392 | break; | |
3393 | } | |
3394 | ||
6993f74a | 3395 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3396 | rdata->mapping = mapping; |
3397 | rdata->offset = offset; | |
3398 | rdata->bytes = bytes; | |
3399 | rdata->pid = pid; | |
8321fec4 JL |
3400 | rdata->pagesz = PAGE_CACHE_SIZE; |
3401 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3402 | |
3403 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3404 | list_del(&page->lru); | |
3405 | rdata->pages[rdata->nr_pages++] = page; | |
3406 | } | |
690c5e31 | 3407 | |
2a1bb138 | 3408 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3409 | if (rc != 0) { |
c5fab6f4 JL |
3410 | for (i = 0; i < rdata->nr_pages; i++) { |
3411 | page = rdata->pages[i]; | |
690c5e31 JL |
3412 | lru_cache_add_file(page); |
3413 | unlock_page(page); | |
3414 | page_cache_release(page); | |
1da177e4 | 3415 | } |
6993f74a | 3416 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3417 | break; |
3418 | } | |
6993f74a JL |
3419 | |
3420 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3421 | } |
3422 | ||
54afa990 DH |
3423 | /* Any pages that have been shown to fscache but didn't get added to |
3424 | * the pagecache must be uncached before they get returned to the | |
3425 | * allocator. | |
3426 | */ | |
3427 | cifs_fscache_readpages_cancel(mapping->host, page_list); | |
1da177e4 LT |
3428 | return rc; |
3429 | } | |
3430 | ||
a9e9b7bc SP |
3431 | /* |
3432 | * cifs_readpage_worker must be called with the page pinned | |
3433 | */ | |
1da177e4 LT |
3434 | static int cifs_readpage_worker(struct file *file, struct page *page, |
3435 | loff_t *poffset) | |
3436 | { | |
3437 | char *read_data; | |
3438 | int rc; | |
3439 | ||
56698236 | 3440 | /* Is the page cached? */ |
496ad9aa | 3441 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3442 | if (rc == 0) |
3443 | goto read_complete; | |
3444 | ||
1da177e4 LT |
3445 | read_data = kmap(page); |
3446 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3447 | |
1da177e4 | 3448 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3449 | |
1da177e4 LT |
3450 | if (rc < 0) |
3451 | goto io_error; | |
3452 | else | |
f96637be | 3453 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3454 | |
496ad9aa AV |
3455 | file_inode(file)->i_atime = |
3456 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3457 | |
1da177e4 LT |
3458 | if (PAGE_CACHE_SIZE > rc) |
3459 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3460 | ||
3461 | flush_dcache_page(page); | |
3462 | SetPageUptodate(page); | |
9dc06558 SJ |
3463 | |
3464 | /* send this page to the cache */ | |
496ad9aa | 3465 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3466 | |
1da177e4 | 3467 | rc = 0; |
fb8c4b14 | 3468 | |
1da177e4 | 3469 | io_error: |
fb8c4b14 | 3470 | kunmap(page); |
466bd31b | 3471 | unlock_page(page); |
56698236 SJ |
3472 | |
3473 | read_complete: | |
1da177e4 LT |
3474 | return rc; |
3475 | } | |
3476 | ||
3477 | static int cifs_readpage(struct file *file, struct page *page) | |
3478 | { | |
3479 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3480 | int rc = -EACCES; | |
6d5786a3 | 3481 | unsigned int xid; |
1da177e4 | 3482 | |
6d5786a3 | 3483 | xid = get_xid(); |
1da177e4 LT |
3484 | |
3485 | if (file->private_data == NULL) { | |
0f3bc09e | 3486 | rc = -EBADF; |
6d5786a3 | 3487 | free_xid(xid); |
0f3bc09e | 3488 | return rc; |
1da177e4 LT |
3489 | } |
3490 | ||
f96637be | 3491 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3492 | page, (int)offset, (int)offset); |
1da177e4 LT |
3493 | |
3494 | rc = cifs_readpage_worker(file, page, &offset); | |
3495 | ||
6d5786a3 | 3496 | free_xid(xid); |
1da177e4 LT |
3497 | return rc; |
3498 | } | |
3499 | ||
a403a0a3 SF |
3500 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3501 | { | |
3502 | struct cifsFileInfo *open_file; | |
3503 | ||
4477288a | 3504 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3505 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3506 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3507 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3508 | return 1; |
3509 | } | |
3510 | } | |
4477288a | 3511 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3512 | return 0; |
3513 | } | |
3514 | ||
1da177e4 LT |
3515 | /* We do not want to update the file size from server for inodes |
3516 | open for write - to avoid races with writepage extending | |
3517 | the file - in the future we could consider allowing | |
fb8c4b14 | 3518 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3519 | but this is tricky to do without racing with writebehind |
3520 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3521 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3522 | { |
a403a0a3 | 3523 | if (!cifsInode) |
4b18f2a9 | 3524 | return true; |
50c2f753 | 3525 | |
a403a0a3 SF |
3526 | if (is_inode_writable(cifsInode)) { |
3527 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3528 | struct cifs_sb_info *cifs_sb; |
3529 | ||
c32a0b68 | 3530 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3531 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3532 | /* since no page cache to corrupt on directio |
c32a0b68 | 3533 | we can change size safely */ |
4b18f2a9 | 3534 | return true; |
c32a0b68 SF |
3535 | } |
3536 | ||
fb8c4b14 | 3537 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3538 | return true; |
7ba52631 | 3539 | |
4b18f2a9 | 3540 | return false; |
23e7dd7d | 3541 | } else |
4b18f2a9 | 3542 | return true; |
1da177e4 LT |
3543 | } |
3544 | ||
d9414774 NP |
3545 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3546 | loff_t pos, unsigned len, unsigned flags, | |
3547 | struct page **pagep, void **fsdata) | |
1da177e4 | 3548 | { |
466bd31b | 3549 | int oncethru = 0; |
d9414774 NP |
3550 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3551 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3552 | loff_t page_start = pos & PAGE_MASK; |
3553 | loff_t i_size; | |
3554 | struct page *page; | |
3555 | int rc = 0; | |
d9414774 | 3556 | |
f96637be | 3557 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3558 | |
466bd31b | 3559 | start: |
54566b2c | 3560 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3561 | if (!page) { |
3562 | rc = -ENOMEM; | |
3563 | goto out; | |
3564 | } | |
8a236264 | 3565 | |
a98ee8c1 JL |
3566 | if (PageUptodate(page)) |
3567 | goto out; | |
8a236264 | 3568 | |
a98ee8c1 JL |
3569 | /* |
3570 | * If we write a full page it will be up to date, no need to read from | |
3571 | * the server. If the write is short, we'll end up doing a sync write | |
3572 | * instead. | |
3573 | */ | |
3574 | if (len == PAGE_CACHE_SIZE) | |
3575 | goto out; | |
8a236264 | 3576 | |
a98ee8c1 JL |
3577 | /* |
3578 | * optimize away the read when we have an oplock, and we're not | |
3579 | * expecting to use any of the data we'd be reading in. That | |
3580 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3581 | * and the write will cover all of the existing data. | |
3582 | */ | |
18cceb6a | 3583 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
a98ee8c1 JL |
3584 | i_size = i_size_read(mapping->host); |
3585 | if (page_start >= i_size || | |
3586 | (offset == 0 && (pos + len) >= i_size)) { | |
3587 | zero_user_segments(page, 0, offset, | |
3588 | offset + len, | |
3589 | PAGE_CACHE_SIZE); | |
3590 | /* | |
3591 | * PageChecked means that the parts of the page | |
3592 | * to which we're not writing are considered up | |
3593 | * to date. Once the data is copied to the | |
3594 | * page, it can be set uptodate. | |
3595 | */ | |
3596 | SetPageChecked(page); | |
3597 | goto out; | |
3598 | } | |
3599 | } | |
d9414774 | 3600 | |
466bd31b | 3601 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
a98ee8c1 JL |
3602 | /* |
3603 | * might as well read a page, it is fast enough. If we get | |
3604 | * an error, we don't need to return it. cifs_write_end will | |
3605 | * do a sync write instead since PG_uptodate isn't set. | |
3606 | */ | |
3607 | cifs_readpage_worker(file, page, &page_start); | |
466bd31b SP |
3608 | page_cache_release(page); |
3609 | oncethru = 1; | |
3610 | goto start; | |
8a236264 SF |
3611 | } else { |
3612 | /* we could try using another file handle if there is one - | |
3613 | but how would we lock it to prevent close of that handle | |
3614 | racing with this read? In any case | |
d9414774 | 3615 | this will be written out by write_end so is fine */ |
1da177e4 | 3616 | } |
a98ee8c1 JL |
3617 | out: |
3618 | *pagep = page; | |
3619 | return rc; | |
1da177e4 LT |
3620 | } |
3621 | ||
85f2d6b4 SJ |
3622 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3623 | { | |
3624 | if (PagePrivate(page)) | |
3625 | return 0; | |
3626 | ||
3627 | return cifs_fscache_release_page(page, gfp); | |
3628 | } | |
3629 | ||
d47992f8 LC |
3630 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
3631 | unsigned int length) | |
85f2d6b4 SJ |
3632 | { |
3633 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3634 | ||
d47992f8 | 3635 | if (offset == 0 && length == PAGE_CACHE_SIZE) |
85f2d6b4 SJ |
3636 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
3637 | } | |
3638 | ||
9ad1506b PS |
3639 | static int cifs_launder_page(struct page *page) |
3640 | { | |
3641 | int rc = 0; | |
3642 | loff_t range_start = page_offset(page); | |
3643 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3644 | struct writeback_control wbc = { | |
3645 | .sync_mode = WB_SYNC_ALL, | |
3646 | .nr_to_write = 0, | |
3647 | .range_start = range_start, | |
3648 | .range_end = range_end, | |
3649 | }; | |
3650 | ||
f96637be | 3651 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
3652 | |
3653 | if (clear_page_dirty_for_io(page)) | |
3654 | rc = cifs_writepage_locked(page, &wbc); | |
3655 | ||
3656 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3657 | return rc; | |
3658 | } | |
3659 | ||
c11f1df5 SP |
3660 | static int |
3661 | cifs_pending_writers_wait(void *unused) | |
3662 | { | |
3663 | schedule(); | |
3664 | return 0; | |
3665 | } | |
3666 | ||
9b646972 | 3667 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3668 | { |
3669 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3670 | oplock_break); | |
a5e18bc3 | 3671 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3672 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3673 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
c11f1df5 | 3674 | struct TCP_Server_Info *server = tcon->ses->server; |
eb4b756b | 3675 | int rc = 0; |
3bc303c2 | 3676 | |
c11f1df5 SP |
3677 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
3678 | cifs_pending_writers_wait, TASK_UNINTERRUPTIBLE); | |
3679 | ||
3680 | server->ops->downgrade_oplock(server, cinode, | |
3681 | test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags)); | |
3682 | ||
18cceb6a | 3683 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
63b7d3a4 | 3684 | cifs_has_mand_locks(cinode)) { |
f96637be JP |
3685 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
3686 | inode); | |
18cceb6a | 3687 | cinode->oplock = 0; |
63b7d3a4 PS |
3688 | } |
3689 | ||
3bc303c2 | 3690 | if (inode && S_ISREG(inode->i_mode)) { |
18cceb6a | 3691 | if (CIFS_CACHE_READ(cinode)) |
8737c930 | 3692 | break_lease(inode, O_RDONLY); |
d54ff732 | 3693 | else |
8737c930 | 3694 | break_lease(inode, O_WRONLY); |
3bc303c2 | 3695 | rc = filemap_fdatawrite(inode->i_mapping); |
18cceb6a | 3696 | if (!CIFS_CACHE_READ(cinode)) { |
eb4b756b JL |
3697 | rc = filemap_fdatawait(inode->i_mapping); |
3698 | mapping_set_error(inode->i_mapping, rc); | |
4f73c7d3 | 3699 | cifs_zap_mapping(inode); |
3bc303c2 | 3700 | } |
f96637be | 3701 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
3702 | } |
3703 | ||
85160e03 PS |
3704 | rc = cifs_push_locks(cfile); |
3705 | if (rc) | |
f96637be | 3706 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 3707 | |
3bc303c2 JL |
3708 | /* |
3709 | * releasing stale oplock after recent reconnect of smb session using | |
3710 | * a now incorrect file handle is not a data integrity issue but do | |
3711 | * not bother sending an oplock release if session to server still is | |
3712 | * disconnected since oplock already released by the server | |
3713 | */ | |
cdff08e7 | 3714 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3715 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3716 | cinode); | |
f96637be | 3717 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 3718 | } |
c11f1df5 | 3719 | cifs_done_oplock_break(cinode); |
3bc303c2 JL |
3720 | } |
3721 | ||
dca69288 SF |
3722 | /* |
3723 | * The presence of cifs_direct_io() in the address space ops vector | |
3724 | * allowes open() O_DIRECT flags which would have failed otherwise. | |
3725 | * | |
3726 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests | |
3727 | * so this method should never be called. | |
3728 | * | |
3729 | * Direct IO is not yet supported in the cached mode. | |
3730 | */ | |
3731 | static ssize_t | |
d8d3d94b AV |
3732 | cifs_direct_io(int rw, struct kiocb *iocb, struct iov_iter *iter, |
3733 | loff_t pos) | |
dca69288 SF |
3734 | { |
3735 | /* | |
3736 | * FIXME | |
3737 | * Eventually need to support direct IO for non forcedirectio mounts | |
3738 | */ | |
3739 | return -EINVAL; | |
3740 | } | |
3741 | ||
3742 | ||
f5e54d6e | 3743 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3744 | .readpage = cifs_readpage, |
3745 | .readpages = cifs_readpages, | |
3746 | .writepage = cifs_writepage, | |
37c0eb46 | 3747 | .writepages = cifs_writepages, |
d9414774 NP |
3748 | .write_begin = cifs_write_begin, |
3749 | .write_end = cifs_write_end, | |
1da177e4 | 3750 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 | 3751 | .releasepage = cifs_release_page, |
dca69288 | 3752 | .direct_IO = cifs_direct_io, |
85f2d6b4 | 3753 | .invalidatepage = cifs_invalidate_page, |
9ad1506b | 3754 | .launder_page = cifs_launder_page, |
1da177e4 | 3755 | }; |
273d81d6 DK |
3756 | |
3757 | /* | |
3758 | * cifs_readpages requires the server to support a buffer large enough to | |
3759 | * contain the header plus one complete page of data. Otherwise, we need | |
3760 | * to leave cifs_readpages out of the address space operations. | |
3761 | */ | |
f5e54d6e | 3762 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3763 | .readpage = cifs_readpage, |
3764 | .writepage = cifs_writepage, | |
3765 | .writepages = cifs_writepages, | |
d9414774 NP |
3766 | .write_begin = cifs_write_begin, |
3767 | .write_end = cifs_write_end, | |
273d81d6 | 3768 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3769 | .releasepage = cifs_release_page, |
3770 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3771 | .launder_page = cifs_launder_page, |
273d81d6 | 3772 | }; |