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 | |
787aded6 NJ |
470 | if (file->f_flags & O_DIRECT && |
471 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { | |
472 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
473 | file->f_op = &cifs_file_direct_nobrl_ops; | |
474 | else | |
475 | file->f_op = &cifs_file_direct_ops; | |
476 | } | |
477 | ||
233839b1 | 478 | if (server->oplocks) |
276a74a4 SF |
479 | oplock = REQ_OPLOCK; |
480 | else | |
481 | oplock = 0; | |
482 | ||
64cc2c63 | 483 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
484 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
485 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 486 | /* can not refresh inode info since size could be stale */ |
2422f676 | 487 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 488 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 489 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 490 | if (rc == 0) { |
f96637be | 491 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 492 | posix_open_ok = true; |
64cc2c63 SF |
493 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
494 | if (tcon->ses->serverNOS) | |
f96637be JP |
495 | 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", |
496 | tcon->ses->serverName, | |
497 | tcon->ses->serverNOS); | |
64cc2c63 | 498 | tcon->broken_posix_open = true; |
276a74a4 SF |
499 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
500 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
501 | goto out; | |
fb1214e4 PS |
502 | /* |
503 | * Else fallthrough to retry open the old way on network i/o | |
504 | * or DFS errors. | |
505 | */ | |
276a74a4 SF |
506 | } |
507 | ||
233839b1 PS |
508 | if (server->ops->get_lease_key) |
509 | server->ops->get_lease_key(inode, &fid); | |
510 | ||
511 | cifs_add_pending_open(&fid, tlink, &open); | |
512 | ||
7e12eddb | 513 | if (!posix_open_ok) { |
b8c32dbb PS |
514 | if (server->ops->get_lease_key) |
515 | server->ops->get_lease_key(inode, &fid); | |
516 | ||
7e12eddb | 517 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 518 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
519 | if (rc) { |
520 | cifs_del_pending_open(&open); | |
7e12eddb | 521 | goto out; |
233839b1 | 522 | } |
7e12eddb | 523 | } |
47c78b7f | 524 | |
fb1214e4 PS |
525 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
526 | if (cfile == NULL) { | |
b8c32dbb PS |
527 | if (server->ops->close) |
528 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 529 | cifs_del_pending_open(&open); |
1da177e4 LT |
530 | rc = -ENOMEM; |
531 | goto out; | |
532 | } | |
1da177e4 | 533 | |
9451a9a5 SJ |
534 | cifs_fscache_set_inode_cookie(inode, file); |
535 | ||
7e12eddb | 536 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
537 | /* |
538 | * Time to set mode which we can not set earlier due to | |
539 | * problems creating new read-only files. | |
540 | */ | |
7e12eddb PS |
541 | struct cifs_unix_set_info_args args = { |
542 | .mode = inode->i_mode, | |
49418b2c EB |
543 | .uid = INVALID_UID, /* no change */ |
544 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
545 | .ctime = NO_CHANGE_64, |
546 | .atime = NO_CHANGE_64, | |
547 | .mtime = NO_CHANGE_64, | |
548 | .device = 0, | |
549 | }; | |
fb1214e4 PS |
550 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
551 | cfile->pid); | |
1da177e4 LT |
552 | } |
553 | ||
554 | out: | |
1da177e4 | 555 | kfree(full_path); |
6d5786a3 | 556 | free_xid(xid); |
7ffec372 | 557 | cifs_put_tlink(tlink); |
1da177e4 LT |
558 | return rc; |
559 | } | |
560 | ||
f152fd5f PS |
561 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
562 | ||
2ae78ba8 PS |
563 | /* |
564 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 565 | * to server was lost. |
2ae78ba8 | 566 | */ |
f152fd5f PS |
567 | static int |
568 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 569 | { |
f152fd5f PS |
570 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
571 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
572 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
573 | int rc = 0; |
574 | ||
689c3db4 | 575 | down_read(&cinode->lock_sem); |
f152fd5f | 576 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
577 | /* can cache locks - no need to relock */ |
578 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
579 | return rc; |
580 | } | |
581 | ||
582 | if (cap_unix(tcon->ses) && | |
583 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
584 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
585 | rc = cifs_push_posix_locks(cfile); | |
586 | else | |
587 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 588 | |
689c3db4 | 589 | up_read(&cinode->lock_sem); |
1da177e4 LT |
590 | return rc; |
591 | } | |
592 | ||
2ae78ba8 PS |
593 | static int |
594 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
595 | { |
596 | int rc = -EACCES; | |
6d5786a3 | 597 | unsigned int xid; |
590a3fe0 | 598 | __u32 oplock; |
1da177e4 | 599 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 600 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
601 | struct TCP_Server_Info *server; |
602 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 603 | struct inode *inode; |
1da177e4 | 604 | char *full_path = NULL; |
2ae78ba8 | 605 | int desired_access; |
1da177e4 | 606 | int disposition = FILE_OPEN; |
3d3ea8e6 | 607 | int create_options = CREATE_NOT_DIR; |
226730b4 | 608 | struct cifs_open_parms oparms; |
1da177e4 | 609 | |
6d5786a3 | 610 | xid = get_xid(); |
2ae78ba8 PS |
611 | mutex_lock(&cfile->fh_mutex); |
612 | if (!cfile->invalidHandle) { | |
613 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 614 | rc = 0; |
6d5786a3 | 615 | free_xid(xid); |
0f3bc09e | 616 | return rc; |
1da177e4 LT |
617 | } |
618 | ||
2ae78ba8 | 619 | inode = cfile->dentry->d_inode; |
1da177e4 | 620 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
621 | tcon = tlink_tcon(cfile->tlink); |
622 | server = tcon->ses->server; | |
623 | ||
624 | /* | |
625 | * Can not grab rename sem here because various ops, including those | |
626 | * that already have the rename sem can end up causing writepage to get | |
627 | * called and if the server was down that means we end up here, and we | |
628 | * can never tell if the caller already has the rename_sem. | |
629 | */ | |
630 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 631 | if (full_path == NULL) { |
3a9f462f | 632 | rc = -ENOMEM; |
2ae78ba8 | 633 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 634 | free_xid(xid); |
3a9f462f | 635 | return rc; |
1da177e4 LT |
636 | } |
637 | ||
f96637be JP |
638 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
639 | inode, cfile->f_flags, full_path); | |
1da177e4 | 640 | |
10b9b98e | 641 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
642 | oplock = REQ_OPLOCK; |
643 | else | |
4b18f2a9 | 644 | oplock = 0; |
1da177e4 | 645 | |
29e20f9c | 646 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 647 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 648 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
649 | /* |
650 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
651 | * original open. Must mask them off for a reopen. | |
652 | */ | |
2ae78ba8 | 653 | unsigned int oflags = cfile->f_flags & |
15886177 | 654 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 655 | |
2422f676 | 656 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 | 657 | cifs_sb->mnt_file_mode /* ignored */, |
9cbc0b73 | 658 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 659 | if (rc == 0) { |
f96637be | 660 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 661 | oparms.reconnect = true; |
7fc8f4e9 SF |
662 | goto reopen_success; |
663 | } | |
2ae78ba8 PS |
664 | /* |
665 | * fallthrough to retry open the old way on errors, especially | |
666 | * in the reconnect path it is important to retry hard | |
667 | */ | |
7fc8f4e9 SF |
668 | } |
669 | ||
2ae78ba8 | 670 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 671 | |
3d3ea8e6 SP |
672 | if (backup_cred(cifs_sb)) |
673 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
674 | ||
b8c32dbb | 675 | if (server->ops->get_lease_key) |
9cbc0b73 | 676 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 677 | |
226730b4 PS |
678 | oparms.tcon = tcon; |
679 | oparms.cifs_sb = cifs_sb; | |
680 | oparms.desired_access = desired_access; | |
681 | oparms.create_options = create_options; | |
682 | oparms.disposition = disposition; | |
683 | oparms.path = full_path; | |
9cbc0b73 PS |
684 | oparms.fid = &cfile->fid; |
685 | oparms.reconnect = true; | |
226730b4 | 686 | |
2ae78ba8 PS |
687 | /* |
688 | * Can not refresh inode by passing in file_info buf to be returned by | |
d81b8a40 | 689 | * ops->open and then calling get_inode_info with returned buf since |
2ae78ba8 PS |
690 | * file might have write behind data that needs to be flushed and server |
691 | * version of file size can be stale. If we knew for sure that inode was | |
692 | * not dirty locally we could do this. | |
693 | */ | |
226730b4 | 694 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
695 | if (rc == -ENOENT && oparms.reconnect == false) { |
696 | /* durable handle timeout is expired - open the file again */ | |
697 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
698 | /* indicate that we need to relock the file */ | |
699 | oparms.reconnect = true; | |
700 | } | |
701 | ||
1da177e4 | 702 | if (rc) { |
2ae78ba8 | 703 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
704 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
705 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
706 | goto reopen_error_exit; |
707 | } | |
708 | ||
7fc8f4e9 | 709 | reopen_success: |
2ae78ba8 PS |
710 | cfile->invalidHandle = false; |
711 | mutex_unlock(&cfile->fh_mutex); | |
712 | cinode = CIFS_I(inode); | |
15886177 JL |
713 | |
714 | if (can_flush) { | |
715 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 716 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 717 | |
15886177 | 718 | if (tcon->unix_ext) |
2ae78ba8 PS |
719 | rc = cifs_get_inode_info_unix(&inode, full_path, |
720 | inode->i_sb, xid); | |
15886177 | 721 | else |
2ae78ba8 PS |
722 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
723 | inode->i_sb, xid, NULL); | |
724 | } | |
725 | /* | |
726 | * Else we are writing out data to server already and could deadlock if | |
727 | * we tried to flush data, and since we do not know if we have data that | |
728 | * would invalidate the current end of file on the server we can not go | |
729 | * to the server to get the new inode info. | |
730 | */ | |
731 | ||
9cbc0b73 PS |
732 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
733 | if (oparms.reconnect) | |
734 | cifs_relock_file(cfile); | |
15886177 JL |
735 | |
736 | reopen_error_exit: | |
1da177e4 | 737 | kfree(full_path); |
6d5786a3 | 738 | free_xid(xid); |
1da177e4 LT |
739 | return rc; |
740 | } | |
741 | ||
742 | int cifs_close(struct inode *inode, struct file *file) | |
743 | { | |
77970693 JL |
744 | if (file->private_data != NULL) { |
745 | cifsFileInfo_put(file->private_data); | |
746 | file->private_data = NULL; | |
747 | } | |
7ee1af76 | 748 | |
cdff08e7 SF |
749 | /* return code from the ->release op is always ignored */ |
750 | return 0; | |
1da177e4 LT |
751 | } |
752 | ||
753 | int cifs_closedir(struct inode *inode, struct file *file) | |
754 | { | |
755 | int rc = 0; | |
6d5786a3 | 756 | unsigned int xid; |
4b4de76e | 757 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
758 | struct cifs_tcon *tcon; |
759 | struct TCP_Server_Info *server; | |
760 | char *buf; | |
1da177e4 | 761 | |
f96637be | 762 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 763 | |
92fc65a7 PS |
764 | if (cfile == NULL) |
765 | return rc; | |
766 | ||
6d5786a3 | 767 | xid = get_xid(); |
92fc65a7 PS |
768 | tcon = tlink_tcon(cfile->tlink); |
769 | server = tcon->ses->server; | |
1da177e4 | 770 | |
f96637be | 771 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
92fc65a7 | 772 | spin_lock(&cifs_file_list_lock); |
52755808 | 773 | if (server->ops->dir_needs_close(cfile)) { |
92fc65a7 PS |
774 | cfile->invalidHandle = true; |
775 | spin_unlock(&cifs_file_list_lock); | |
776 | if (server->ops->close_dir) | |
777 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
778 | else | |
779 | rc = -ENOSYS; | |
f96637be | 780 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
781 | /* not much we can do if it fails anyway, ignore rc */ |
782 | rc = 0; | |
783 | } else | |
784 | spin_unlock(&cifs_file_list_lock); | |
785 | ||
786 | buf = cfile->srch_inf.ntwrk_buf_start; | |
787 | if (buf) { | |
f96637be | 788 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
789 | cfile->srch_inf.ntwrk_buf_start = NULL; |
790 | if (cfile->srch_inf.smallBuf) | |
791 | cifs_small_buf_release(buf); | |
792 | else | |
793 | cifs_buf_release(buf); | |
1da177e4 | 794 | } |
92fc65a7 PS |
795 | |
796 | cifs_put_tlink(cfile->tlink); | |
797 | kfree(file->private_data); | |
798 | file->private_data = NULL; | |
1da177e4 | 799 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 800 | free_xid(xid); |
1da177e4 LT |
801 | return rc; |
802 | } | |
803 | ||
85160e03 | 804 | static struct cifsLockInfo * |
fbd35aca | 805 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 806 | { |
a88b4707 | 807 | struct cifsLockInfo *lock = |
fb8c4b14 | 808 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
809 | if (!lock) |
810 | return lock; | |
811 | lock->offset = offset; | |
812 | lock->length = length; | |
813 | lock->type = type; | |
a88b4707 PS |
814 | lock->pid = current->tgid; |
815 | INIT_LIST_HEAD(&lock->blist); | |
816 | init_waitqueue_head(&lock->block_q); | |
817 | return lock; | |
85160e03 PS |
818 | } |
819 | ||
f7ba7fe6 | 820 | void |
85160e03 PS |
821 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
822 | { | |
823 | struct cifsLockInfo *li, *tmp; | |
824 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
825 | list_del_init(&li->blist); | |
826 | wake_up(&li->block_q); | |
827 | } | |
828 | } | |
829 | ||
081c0414 PS |
830 | #define CIFS_LOCK_OP 0 |
831 | #define CIFS_READ_OP 1 | |
832 | #define CIFS_WRITE_OP 2 | |
833 | ||
834 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 835 | static bool |
f45d3416 PS |
836 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
837 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 838 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 839 | { |
fbd35aca | 840 | struct cifsLockInfo *li; |
f45d3416 | 841 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 842 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 843 | |
f45d3416 | 844 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
845 | if (offset + length <= li->offset || |
846 | offset >= li->offset + li->length) | |
847 | continue; | |
081c0414 PS |
848 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
849 | server->ops->compare_fids(cfile, cur_cfile)) { | |
850 | /* shared lock prevents write op through the same fid */ | |
851 | if (!(li->type & server->vals->shared_lock_type) || | |
852 | rw_check != CIFS_WRITE_OP) | |
853 | continue; | |
854 | } | |
f45d3416 PS |
855 | if ((type & server->vals->shared_lock_type) && |
856 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
857 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 858 | continue; |
579f9053 PS |
859 | if (conf_lock) |
860 | *conf_lock = li; | |
f45d3416 | 861 | return true; |
85160e03 PS |
862 | } |
863 | return false; | |
864 | } | |
865 | ||
579f9053 | 866 | bool |
55157dfb | 867 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 868 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 869 | int rw_check) |
161ebf9f | 870 | { |
fbd35aca | 871 | bool rc = false; |
f45d3416 | 872 | struct cifs_fid_locks *cur; |
55157dfb | 873 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 874 | |
f45d3416 PS |
875 | list_for_each_entry(cur, &cinode->llist, llist) { |
876 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 877 | cfile, conf_lock, rw_check); |
fbd35aca PS |
878 | if (rc) |
879 | break; | |
880 | } | |
fbd35aca PS |
881 | |
882 | return rc; | |
161ebf9f PS |
883 | } |
884 | ||
9a5101c8 PS |
885 | /* |
886 | * Check if there is another lock that prevents us to set the lock (mandatory | |
887 | * style). If such a lock exists, update the flock structure with its | |
888 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
889 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
890 | * the server or 1 otherwise. | |
891 | */ | |
85160e03 | 892 | static int |
fbd35aca PS |
893 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
894 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
895 | { |
896 | int rc = 0; | |
897 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 898 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 899 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
900 | bool exist; |
901 | ||
1b4b55a1 | 902 | down_read(&cinode->lock_sem); |
85160e03 | 903 | |
55157dfb | 904 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 905 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
906 | if (exist) { |
907 | flock->fl_start = conf_lock->offset; | |
908 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
909 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 910 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
911 | flock->fl_type = F_RDLCK; |
912 | else | |
913 | flock->fl_type = F_WRLCK; | |
914 | } else if (!cinode->can_cache_brlcks) | |
915 | rc = 1; | |
916 | else | |
917 | flock->fl_type = F_UNLCK; | |
918 | ||
1b4b55a1 | 919 | up_read(&cinode->lock_sem); |
85160e03 PS |
920 | return rc; |
921 | } | |
922 | ||
161ebf9f | 923 | static void |
fbd35aca | 924 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 925 | { |
fbd35aca | 926 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 927 | down_write(&cinode->lock_sem); |
f45d3416 | 928 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 929 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
930 | } |
931 | ||
9a5101c8 PS |
932 | /* |
933 | * Set the byte-range lock (mandatory style). Returns: | |
934 | * 1) 0, if we set the lock and don't need to request to the server; | |
935 | * 2) 1, if no locks prevent us but we need to request to the server; | |
936 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
937 | */ | |
85160e03 | 938 | static int |
fbd35aca | 939 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 940 | bool wait) |
85160e03 | 941 | { |
161ebf9f | 942 | struct cifsLockInfo *conf_lock; |
fbd35aca | 943 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
944 | bool exist; |
945 | int rc = 0; | |
946 | ||
85160e03 PS |
947 | try_again: |
948 | exist = false; | |
1b4b55a1 | 949 | down_write(&cinode->lock_sem); |
85160e03 | 950 | |
55157dfb | 951 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 952 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 953 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 954 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 955 | up_write(&cinode->lock_sem); |
85160e03 PS |
956 | return rc; |
957 | } | |
958 | ||
959 | if (!exist) | |
960 | rc = 1; | |
961 | else if (!wait) | |
962 | rc = -EACCES; | |
963 | else { | |
964 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 965 | up_write(&cinode->lock_sem); |
85160e03 PS |
966 | rc = wait_event_interruptible(lock->block_q, |
967 | (lock->blist.prev == &lock->blist) && | |
968 | (lock->blist.next == &lock->blist)); | |
969 | if (!rc) | |
970 | goto try_again; | |
1b4b55a1 | 971 | down_write(&cinode->lock_sem); |
a88b4707 | 972 | list_del_init(&lock->blist); |
85160e03 PS |
973 | } |
974 | ||
1b4b55a1 | 975 | up_write(&cinode->lock_sem); |
85160e03 PS |
976 | return rc; |
977 | } | |
978 | ||
9a5101c8 PS |
979 | /* |
980 | * Check if there is another lock that prevents us to set the lock (posix | |
981 | * style). If such a lock exists, update the flock structure with its | |
982 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
983 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
984 | * the server or 1 otherwise. | |
985 | */ | |
85160e03 | 986 | static int |
4f6bcec9 PS |
987 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
988 | { | |
989 | int rc = 0; | |
496ad9aa | 990 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
991 | unsigned char saved_type = flock->fl_type; |
992 | ||
50792760 PS |
993 | if ((flock->fl_flags & FL_POSIX) == 0) |
994 | return 1; | |
995 | ||
1b4b55a1 | 996 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
997 | posix_test_lock(file, flock); |
998 | ||
999 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
1000 | flock->fl_type = saved_type; | |
1001 | rc = 1; | |
1002 | } | |
1003 | ||
1b4b55a1 | 1004 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
1005 | return rc; |
1006 | } | |
1007 | ||
9a5101c8 PS |
1008 | /* |
1009 | * Set the byte-range lock (posix style). Returns: | |
1010 | * 1) 0, if we set the lock and don't need to request to the server; | |
1011 | * 2) 1, if we need to request to the server; | |
1012 | * 3) <0, if the error occurs while setting the lock. | |
1013 | */ | |
4f6bcec9 PS |
1014 | static int |
1015 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1016 | { | |
496ad9aa | 1017 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
1018 | int rc = 1; |
1019 | ||
1020 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1021 | return rc; | |
4f6bcec9 | 1022 | |
66189be7 | 1023 | try_again: |
1b4b55a1 | 1024 | down_write(&cinode->lock_sem); |
4f6bcec9 | 1025 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1026 | up_write(&cinode->lock_sem); |
50792760 | 1027 | return rc; |
4f6bcec9 | 1028 | } |
66189be7 PS |
1029 | |
1030 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1031 | up_write(&cinode->lock_sem); |
66189be7 PS |
1032 | if (rc == FILE_LOCK_DEFERRED) { |
1033 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1034 | if (!rc) | |
1035 | goto try_again; | |
1a9e64a7 | 1036 | posix_unblock_lock(flock); |
66189be7 | 1037 | } |
9ebb389d | 1038 | return rc; |
4f6bcec9 PS |
1039 | } |
1040 | ||
d39a4f71 | 1041 | int |
4f6bcec9 | 1042 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1043 | { |
6d5786a3 PS |
1044 | unsigned int xid; |
1045 | int rc = 0, stored_rc; | |
85160e03 PS |
1046 | struct cifsLockInfo *li, *tmp; |
1047 | struct cifs_tcon *tcon; | |
0013fb4c | 1048 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1049 | LOCKING_ANDX_RANGE *buf, *cur; |
1050 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1051 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1052 | int i; | |
85160e03 | 1053 | |
6d5786a3 | 1054 | xid = get_xid(); |
85160e03 PS |
1055 | tcon = tlink_tcon(cfile->tlink); |
1056 | ||
0013fb4c PS |
1057 | /* |
1058 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1059 | * and check it for zero before using. | |
1060 | */ | |
1061 | max_buf = tcon->ses->server->maxBuf; | |
1062 | if (!max_buf) { | |
6d5786a3 | 1063 | free_xid(xid); |
0013fb4c PS |
1064 | return -EINVAL; |
1065 | } | |
1066 | ||
1067 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1068 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1069 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1070 | if (!buf) { | |
6d5786a3 | 1071 | free_xid(xid); |
e2f2886a | 1072 | return -ENOMEM; |
32b9aaf1 PS |
1073 | } |
1074 | ||
1075 | for (i = 0; i < 2; i++) { | |
1076 | cur = buf; | |
1077 | num = 0; | |
f45d3416 | 1078 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1079 | if (li->type != types[i]) |
1080 | continue; | |
1081 | cur->Pid = cpu_to_le16(li->pid); | |
1082 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1083 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1084 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1085 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1086 | if (++num == max_num) { | |
4b4de76e PS |
1087 | stored_rc = cifs_lockv(xid, tcon, |
1088 | cfile->fid.netfid, | |
04a6aa8a PS |
1089 | (__u8)li->type, 0, num, |
1090 | buf); | |
32b9aaf1 PS |
1091 | if (stored_rc) |
1092 | rc = stored_rc; | |
1093 | cur = buf; | |
1094 | num = 0; | |
1095 | } else | |
1096 | cur++; | |
1097 | } | |
1098 | ||
1099 | if (num) { | |
4b4de76e | 1100 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1101 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1102 | if (stored_rc) |
1103 | rc = stored_rc; | |
1104 | } | |
85160e03 PS |
1105 | } |
1106 | ||
32b9aaf1 | 1107 | kfree(buf); |
6d5786a3 | 1108 | free_xid(xid); |
85160e03 PS |
1109 | return rc; |
1110 | } | |
1111 | ||
4f6bcec9 PS |
1112 | /* copied from fs/locks.c with a name change */ |
1113 | #define cifs_for_each_lock(inode, lockp) \ | |
1114 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1115 | lockp = &(*lockp)->fl_next) | |
1116 | ||
d5751469 PS |
1117 | struct lock_to_push { |
1118 | struct list_head llist; | |
1119 | __u64 offset; | |
1120 | __u64 length; | |
1121 | __u32 pid; | |
1122 | __u16 netfid; | |
1123 | __u8 type; | |
1124 | }; | |
1125 | ||
4f6bcec9 | 1126 | static int |
b8db928b | 1127 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1128 | { |
1c8c601a | 1129 | struct inode *inode = cfile->dentry->d_inode; |
4f6bcec9 PS |
1130 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1131 | struct file_lock *flock, **before; | |
d5751469 | 1132 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1133 | int rc = 0, xid, type; |
d5751469 PS |
1134 | struct list_head locks_to_send, *el; |
1135 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1136 | __u64 length; |
4f6bcec9 | 1137 | |
6d5786a3 | 1138 | xid = get_xid(); |
4f6bcec9 | 1139 | |
1c8c601a JL |
1140 | spin_lock(&inode->i_lock); |
1141 | cifs_for_each_lock(inode, before) { | |
d5751469 PS |
1142 | if ((*before)->fl_flags & FL_POSIX) |
1143 | count++; | |
1144 | } | |
1c8c601a | 1145 | spin_unlock(&inode->i_lock); |
d5751469 | 1146 | |
4f6bcec9 PS |
1147 | INIT_LIST_HEAD(&locks_to_send); |
1148 | ||
d5751469 | 1149 | /* |
ce85852b | 1150 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1151 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1152 | * protects locking operations of this inode. |
d5751469 PS |
1153 | */ |
1154 | for (; i < count; i++) { | |
1155 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1156 | if (!lck) { | |
1157 | rc = -ENOMEM; | |
1158 | goto err_out; | |
1159 | } | |
1160 | list_add_tail(&lck->llist, &locks_to_send); | |
1161 | } | |
1162 | ||
d5751469 | 1163 | el = locks_to_send.next; |
1c8c601a JL |
1164 | spin_lock(&inode->i_lock); |
1165 | cifs_for_each_lock(inode, before) { | |
ce85852b PS |
1166 | flock = *before; |
1167 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1168 | continue; | |
d5751469 | 1169 | if (el == &locks_to_send) { |
ce85852b PS |
1170 | /* |
1171 | * The list ended. We don't have enough allocated | |
1172 | * structures - something is really wrong. | |
1173 | */ | |
f96637be | 1174 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1175 | break; |
1176 | } | |
4f6bcec9 PS |
1177 | length = 1 + flock->fl_end - flock->fl_start; |
1178 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1179 | type = CIFS_RDLCK; | |
1180 | else | |
1181 | type = CIFS_WRLCK; | |
d5751469 | 1182 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1183 | lck->pid = flock->fl_pid; |
4b4de76e | 1184 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1185 | lck->length = length; |
1186 | lck->type = type; | |
1187 | lck->offset = flock->fl_start; | |
d5751469 | 1188 | el = el->next; |
4f6bcec9 | 1189 | } |
1c8c601a | 1190 | spin_unlock(&inode->i_lock); |
4f6bcec9 PS |
1191 | |
1192 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1193 | int stored_rc; |
1194 | ||
4f6bcec9 | 1195 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1196 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1197 | lck->type, 0); |
1198 | if (stored_rc) | |
1199 | rc = stored_rc; | |
1200 | list_del(&lck->llist); | |
1201 | kfree(lck); | |
1202 | } | |
1203 | ||
d5751469 | 1204 | out: |
6d5786a3 | 1205 | free_xid(xid); |
4f6bcec9 | 1206 | return rc; |
d5751469 PS |
1207 | err_out: |
1208 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1209 | list_del(&lck->llist); | |
1210 | kfree(lck); | |
1211 | } | |
1212 | goto out; | |
4f6bcec9 PS |
1213 | } |
1214 | ||
9ec3c882 | 1215 | static int |
b8db928b | 1216 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1217 | { |
b8db928b | 1218 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1219 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1220 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1221 | int rc = 0; |
1222 | ||
1223 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1224 | down_write(&cinode->lock_sem); | |
1225 | if (!cinode->can_cache_brlcks) { | |
1226 | up_write(&cinode->lock_sem); | |
1227 | return rc; | |
1228 | } | |
4f6bcec9 | 1229 | |
29e20f9c | 1230 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1231 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1232 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1233 | rc = cifs_push_posix_locks(cfile); |
1234 | else | |
1235 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1236 | |
b8db928b PS |
1237 | cinode->can_cache_brlcks = false; |
1238 | up_write(&cinode->lock_sem); | |
1239 | return rc; | |
4f6bcec9 PS |
1240 | } |
1241 | ||
03776f45 | 1242 | static void |
04a6aa8a | 1243 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1244 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1245 | { |
03776f45 | 1246 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1247 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1248 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1249 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1250 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1251 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1252 | *wait_flag = true; |
1da177e4 | 1253 | } |
03776f45 | 1254 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1255 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1256 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1257 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1258 | if (flock->fl_flags & |
3d6d854a JL |
1259 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1260 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1261 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1262 | |
106dc538 | 1263 | *type = server->vals->large_lock_type; |
03776f45 | 1264 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1265 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1266 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1267 | *lock = 1; |
1268 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1269 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1270 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1271 | *unlock = 1; |
1272 | /* Check if unlock includes more than one lock range */ | |
1273 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1274 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1275 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1276 | *lock = 1; |
1277 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1278 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1279 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1280 | *lock = 1; |
1281 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1282 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1283 | *type |= server->vals->shared_lock_type; |
03776f45 | 1284 | *lock = 1; |
1da177e4 | 1285 | } else |
f96637be | 1286 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1287 | } |
1da177e4 | 1288 | |
03776f45 | 1289 | static int |
04a6aa8a | 1290 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1291 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1292 | { |
1293 | int rc = 0; | |
1294 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1295 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1296 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1297 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1298 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1299 | |
03776f45 PS |
1300 | if (posix_lck) { |
1301 | int posix_lock_type; | |
4f6bcec9 PS |
1302 | |
1303 | rc = cifs_posix_lock_test(file, flock); | |
1304 | if (!rc) | |
1305 | return rc; | |
1306 | ||
106dc538 | 1307 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1308 | posix_lock_type = CIFS_RDLCK; |
1309 | else | |
1310 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1311 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1312 | flock->fl_start, length, flock, |
4f6bcec9 | 1313 | posix_lock_type, wait_flag); |
03776f45 PS |
1314 | return rc; |
1315 | } | |
1da177e4 | 1316 | |
fbd35aca | 1317 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1318 | if (!rc) |
1319 | return rc; | |
1320 | ||
03776f45 | 1321 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1322 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1323 | 1, 0, false); | |
03776f45 | 1324 | if (rc == 0) { |
d39a4f71 PS |
1325 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1326 | type, 0, 1, false); | |
03776f45 PS |
1327 | flock->fl_type = F_UNLCK; |
1328 | if (rc != 0) | |
f96637be JP |
1329 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1330 | rc); | |
a88b4707 | 1331 | return 0; |
1da177e4 | 1332 | } |
7ee1af76 | 1333 | |
106dc538 | 1334 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1335 | flock->fl_type = F_WRLCK; |
a88b4707 | 1336 | return 0; |
7ee1af76 JA |
1337 | } |
1338 | ||
d39a4f71 PS |
1339 | type &= ~server->vals->exclusive_lock_type; |
1340 | ||
1341 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1342 | type | server->vals->shared_lock_type, | |
1343 | 1, 0, false); | |
03776f45 | 1344 | if (rc == 0) { |
d39a4f71 PS |
1345 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1346 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1347 | flock->fl_type = F_RDLCK; |
1348 | if (rc != 0) | |
f96637be JP |
1349 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1350 | rc); | |
03776f45 PS |
1351 | } else |
1352 | flock->fl_type = F_WRLCK; | |
1353 | ||
a88b4707 | 1354 | return 0; |
03776f45 PS |
1355 | } |
1356 | ||
f7ba7fe6 | 1357 | void |
9ee305b7 PS |
1358 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1359 | { | |
1360 | struct list_head *li, *tmp; | |
1361 | list_for_each_safe(li, tmp, source) | |
1362 | list_move(li, dest); | |
1363 | } | |
1364 | ||
f7ba7fe6 | 1365 | void |
9ee305b7 PS |
1366 | cifs_free_llist(struct list_head *llist) |
1367 | { | |
1368 | struct cifsLockInfo *li, *tmp; | |
1369 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1370 | cifs_del_lock_waiters(li); | |
1371 | list_del(&li->llist); | |
1372 | kfree(li); | |
1373 | } | |
1374 | } | |
1375 | ||
d39a4f71 | 1376 | int |
6d5786a3 PS |
1377 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1378 | unsigned int xid) | |
9ee305b7 PS |
1379 | { |
1380 | int rc = 0, stored_rc; | |
1381 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1382 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1383 | unsigned int i; | |
0013fb4c | 1384 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1385 | LOCKING_ANDX_RANGE *buf, *cur; |
1386 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1387 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1388 | struct cifsLockInfo *li, *tmp; | |
1389 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1390 | struct list_head tmp_llist; | |
1391 | ||
1392 | INIT_LIST_HEAD(&tmp_llist); | |
1393 | ||
0013fb4c PS |
1394 | /* |
1395 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1396 | * and check it for zero before using. | |
1397 | */ | |
1398 | max_buf = tcon->ses->server->maxBuf; | |
1399 | if (!max_buf) | |
1400 | return -EINVAL; | |
1401 | ||
1402 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1403 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1404 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1405 | if (!buf) | |
1406 | return -ENOMEM; | |
1407 | ||
1b4b55a1 | 1408 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1409 | for (i = 0; i < 2; i++) { |
1410 | cur = buf; | |
1411 | num = 0; | |
f45d3416 | 1412 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1413 | if (flock->fl_start > li->offset || |
1414 | (flock->fl_start + length) < | |
1415 | (li->offset + li->length)) | |
1416 | continue; | |
1417 | if (current->tgid != li->pid) | |
1418 | continue; | |
9ee305b7 PS |
1419 | if (types[i] != li->type) |
1420 | continue; | |
ea319d57 | 1421 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1422 | /* |
1423 | * We can cache brlock requests - simply remove | |
fbd35aca | 1424 | * a lock from the file's list. |
9ee305b7 PS |
1425 | */ |
1426 | list_del(&li->llist); | |
1427 | cifs_del_lock_waiters(li); | |
1428 | kfree(li); | |
ea319d57 | 1429 | continue; |
9ee305b7 | 1430 | } |
ea319d57 PS |
1431 | cur->Pid = cpu_to_le16(li->pid); |
1432 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1433 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1434 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1435 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1436 | /* | |
1437 | * We need to save a lock here to let us add it again to | |
1438 | * the file's list if the unlock range request fails on | |
1439 | * the server. | |
1440 | */ | |
1441 | list_move(&li->llist, &tmp_llist); | |
1442 | if (++num == max_num) { | |
4b4de76e PS |
1443 | stored_rc = cifs_lockv(xid, tcon, |
1444 | cfile->fid.netfid, | |
ea319d57 PS |
1445 | li->type, num, 0, buf); |
1446 | if (stored_rc) { | |
1447 | /* | |
1448 | * We failed on the unlock range | |
1449 | * request - add all locks from the tmp | |
1450 | * list to the head of the file's list. | |
1451 | */ | |
1452 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1453 | &cfile->llist->locks); |
ea319d57 PS |
1454 | rc = stored_rc; |
1455 | } else | |
1456 | /* | |
1457 | * The unlock range request succeed - | |
1458 | * free the tmp list. | |
1459 | */ | |
1460 | cifs_free_llist(&tmp_llist); | |
1461 | cur = buf; | |
1462 | num = 0; | |
1463 | } else | |
1464 | cur++; | |
9ee305b7 PS |
1465 | } |
1466 | if (num) { | |
4b4de76e | 1467 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1468 | types[i], num, 0, buf); |
1469 | if (stored_rc) { | |
f45d3416 PS |
1470 | cifs_move_llist(&tmp_llist, |
1471 | &cfile->llist->locks); | |
9ee305b7 PS |
1472 | rc = stored_rc; |
1473 | } else | |
1474 | cifs_free_llist(&tmp_llist); | |
1475 | } | |
1476 | } | |
1477 | ||
1b4b55a1 | 1478 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1479 | kfree(buf); |
1480 | return rc; | |
1481 | } | |
1482 | ||
03776f45 | 1483 | static int |
f45d3416 | 1484 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1485 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1486 | unsigned int xid) | |
03776f45 PS |
1487 | { |
1488 | int rc = 0; | |
1489 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1490 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1491 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1492 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1493 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1494 | |
1495 | if (posix_lck) { | |
08547b03 | 1496 | int posix_lock_type; |
4f6bcec9 PS |
1497 | |
1498 | rc = cifs_posix_lock_set(file, flock); | |
1499 | if (!rc || rc < 0) | |
1500 | return rc; | |
1501 | ||
106dc538 | 1502 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1503 | posix_lock_type = CIFS_RDLCK; |
1504 | else | |
1505 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1506 | |
03776f45 | 1507 | if (unlock == 1) |
beb84dc8 | 1508 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1509 | |
f45d3416 PS |
1510 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1511 | current->tgid, flock->fl_start, length, | |
1512 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1513 | goto out; |
1514 | } | |
7ee1af76 | 1515 | |
03776f45 | 1516 | if (lock) { |
161ebf9f PS |
1517 | struct cifsLockInfo *lock; |
1518 | ||
fbd35aca | 1519 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1520 | if (!lock) |
1521 | return -ENOMEM; | |
1522 | ||
fbd35aca | 1523 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1524 | if (rc < 0) { |
161ebf9f | 1525 | kfree(lock); |
21cb2d90 PS |
1526 | return rc; |
1527 | } | |
1528 | if (!rc) | |
85160e03 PS |
1529 | goto out; |
1530 | ||
63b7d3a4 PS |
1531 | /* |
1532 | * Windows 7 server can delay breaking lease from read to None | |
1533 | * if we set a byte-range lock on a file - break it explicitly | |
1534 | * before sending the lock to the server to be sure the next | |
1535 | * read won't conflict with non-overlapted locks due to | |
1536 | * pagereading. | |
1537 | */ | |
18cceb6a PS |
1538 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
1539 | CIFS_CACHE_READ(CIFS_I(inode))) { | |
4f73c7d3 | 1540 | cifs_zap_mapping(inode); |
f96637be JP |
1541 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1542 | inode); | |
18cceb6a | 1543 | CIFS_I(inode)->oplock = 0; |
63b7d3a4 PS |
1544 | } |
1545 | ||
d39a4f71 PS |
1546 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1547 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1548 | if (rc) { |
1549 | kfree(lock); | |
21cb2d90 | 1550 | return rc; |
03776f45 | 1551 | } |
161ebf9f | 1552 | |
fbd35aca | 1553 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1554 | } else if (unlock) |
d39a4f71 | 1555 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1556 | |
03776f45 PS |
1557 | out: |
1558 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1559 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1560 | return rc; |
1561 | } | |
1562 | ||
1563 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1564 | { | |
1565 | int rc, xid; | |
1566 | int lock = 0, unlock = 0; | |
1567 | bool wait_flag = false; | |
1568 | bool posix_lck = false; | |
1569 | struct cifs_sb_info *cifs_sb; | |
1570 | struct cifs_tcon *tcon; | |
1571 | struct cifsInodeInfo *cinode; | |
1572 | struct cifsFileInfo *cfile; | |
1573 | __u16 netfid; | |
04a6aa8a | 1574 | __u32 type; |
03776f45 PS |
1575 | |
1576 | rc = -EACCES; | |
6d5786a3 | 1577 | xid = get_xid(); |
03776f45 | 1578 | |
f96637be JP |
1579 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1580 | cmd, flock->fl_flags, flock->fl_type, | |
1581 | flock->fl_start, flock->fl_end); | |
03776f45 | 1582 | |
03776f45 PS |
1583 | cfile = (struct cifsFileInfo *)file->private_data; |
1584 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1585 | |
1586 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1587 | tcon->ses->server); | |
1588 | ||
1589 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1590 | netfid = cfile->fid.netfid; |
496ad9aa | 1591 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1592 | |
29e20f9c | 1593 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1594 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1595 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1596 | posix_lck = true; | |
1597 | /* | |
1598 | * BB add code here to normalize offset and length to account for | |
1599 | * negative length which we can not accept over the wire. | |
1600 | */ | |
1601 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1602 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1603 | free_xid(xid); |
03776f45 PS |
1604 | return rc; |
1605 | } | |
1606 | ||
1607 | if (!lock && !unlock) { | |
1608 | /* | |
1609 | * if no lock or unlock then nothing to do since we do not | |
1610 | * know what it is | |
1611 | */ | |
6d5786a3 | 1612 | free_xid(xid); |
03776f45 | 1613 | return -EOPNOTSUPP; |
7ee1af76 JA |
1614 | } |
1615 | ||
03776f45 PS |
1616 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1617 | xid); | |
6d5786a3 | 1618 | free_xid(xid); |
1da177e4 LT |
1619 | return rc; |
1620 | } | |
1621 | ||
597b027f JL |
1622 | /* |
1623 | * update the file size (if needed) after a write. Should be called with | |
1624 | * the inode->i_lock held | |
1625 | */ | |
72432ffc | 1626 | void |
fbec9ab9 JL |
1627 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1628 | unsigned int bytes_written) | |
1629 | { | |
1630 | loff_t end_of_write = offset + bytes_written; | |
1631 | ||
1632 | if (end_of_write > cifsi->server_eof) | |
1633 | cifsi->server_eof = end_of_write; | |
1634 | } | |
1635 | ||
ba9ad725 PS |
1636 | static ssize_t |
1637 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1638 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1639 | { |
1640 | int rc = 0; | |
1641 | unsigned int bytes_written = 0; | |
1642 | unsigned int total_written; | |
1643 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1644 | struct cifs_tcon *tcon; |
1645 | struct TCP_Server_Info *server; | |
6d5786a3 | 1646 | unsigned int xid; |
7da4b49a JL |
1647 | struct dentry *dentry = open_file->dentry; |
1648 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1649 | struct cifs_io_parms io_parms; |
1da177e4 | 1650 | |
7da4b49a | 1651 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1652 | |
f96637be JP |
1653 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n", |
1654 | write_size, *offset, dentry->d_name.name); | |
1da177e4 | 1655 | |
ba9ad725 PS |
1656 | tcon = tlink_tcon(open_file->tlink); |
1657 | server = tcon->ses->server; | |
1658 | ||
1659 | if (!server->ops->sync_write) | |
1660 | return -ENOSYS; | |
50c2f753 | 1661 | |
6d5786a3 | 1662 | xid = get_xid(); |
1da177e4 | 1663 | |
1da177e4 LT |
1664 | for (total_written = 0; write_size > total_written; |
1665 | total_written += bytes_written) { | |
1666 | rc = -EAGAIN; | |
1667 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1668 | struct kvec iov[2]; |
1669 | unsigned int len; | |
1670 | ||
1da177e4 | 1671 | if (open_file->invalidHandle) { |
1da177e4 LT |
1672 | /* we could deadlock if we called |
1673 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1674 | reopen_file not to flush data to |
1da177e4 | 1675 | server now */ |
15886177 | 1676 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1677 | if (rc != 0) |
1678 | break; | |
1679 | } | |
ca83ce3d | 1680 | |
cb7e9eab PS |
1681 | len = min(server->ops->wp_retry_size(dentry->d_inode), |
1682 | (unsigned int)write_size - total_written); | |
ca83ce3d JL |
1683 | /* iov[0] is reserved for smb header */ |
1684 | iov[1].iov_base = (char *)write_data + total_written; | |
1685 | iov[1].iov_len = len; | |
fa2989f4 | 1686 | io_parms.pid = pid; |
ba9ad725 PS |
1687 | io_parms.tcon = tcon; |
1688 | io_parms.offset = *offset; | |
fa2989f4 | 1689 | io_parms.length = len; |
ba9ad725 PS |
1690 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1691 | &bytes_written, iov, 1); | |
1da177e4 LT |
1692 | } |
1693 | if (rc || (bytes_written == 0)) { | |
1694 | if (total_written) | |
1695 | break; | |
1696 | else { | |
6d5786a3 | 1697 | free_xid(xid); |
1da177e4 LT |
1698 | return rc; |
1699 | } | |
fbec9ab9 | 1700 | } else { |
597b027f | 1701 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1702 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1703 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1704 | *offset += bytes_written; |
fbec9ab9 | 1705 | } |
1da177e4 LT |
1706 | } |
1707 | ||
ba9ad725 | 1708 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1709 | |
7da4b49a JL |
1710 | if (total_written > 0) { |
1711 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1712 | if (*offset > dentry->d_inode->i_size) |
1713 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1714 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1715 | } |
7da4b49a | 1716 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1717 | free_xid(xid); |
1da177e4 LT |
1718 | return total_written; |
1719 | } | |
1720 | ||
6508d904 JL |
1721 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1722 | bool fsuid_only) | |
630f3f0c SF |
1723 | { |
1724 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1725 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1726 | ||
1727 | /* only filter by fsuid on multiuser mounts */ | |
1728 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1729 | fsuid_only = false; | |
630f3f0c | 1730 | |
4477288a | 1731 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1732 | /* we could simply get the first_list_entry since write-only entries |
1733 | are always at the end of the list but since the first entry might | |
1734 | have a close pending, we go through the whole list */ | |
1735 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1736 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1737 | continue; |
2e396b83 | 1738 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1739 | if (!open_file->invalidHandle) { |
1740 | /* found a good file */ | |
1741 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1742 | cifsFileInfo_get_locked(open_file); |
4477288a | 1743 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1744 | return open_file; |
1745 | } /* else might as well continue, and look for | |
1746 | another, or simply have the caller reopen it | |
1747 | again rather than trying to fix this handle */ | |
1748 | } else /* write only file */ | |
1749 | break; /* write only files are last so must be done */ | |
1750 | } | |
4477288a | 1751 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1752 | return NULL; |
1753 | } | |
630f3f0c | 1754 | |
6508d904 JL |
1755 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1756 | bool fsuid_only) | |
6148a742 | 1757 | { |
2c0c2a08 | 1758 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1759 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1760 | bool any_available = false; |
dd99cd80 | 1761 | int rc; |
2c0c2a08 | 1762 | unsigned int refind = 0; |
6148a742 | 1763 | |
60808233 SF |
1764 | /* Having a null inode here (because mapping->host was set to zero by |
1765 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1766 | it being zero) during stress testcases so we need to check for it */ | |
1767 | ||
fb8c4b14 | 1768 | if (cifs_inode == NULL) { |
f96637be | 1769 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1770 | dump_stack(); |
1771 | return NULL; | |
1772 | } | |
1773 | ||
d3892294 JL |
1774 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1775 | ||
6508d904 JL |
1776 | /* only filter by fsuid on multiuser mounts */ |
1777 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1778 | fsuid_only = false; | |
1779 | ||
4477288a | 1780 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1781 | refind_writable: |
2c0c2a08 SP |
1782 | if (refind > MAX_REOPEN_ATT) { |
1783 | spin_unlock(&cifs_file_list_lock); | |
1784 | return NULL; | |
1785 | } | |
6148a742 | 1786 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1787 | if (!any_available && open_file->pid != current->tgid) |
1788 | continue; | |
fef59fd7 | 1789 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1790 | continue; |
2e396b83 | 1791 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1792 | if (!open_file->invalidHandle) { |
1793 | /* found a good writable file */ | |
764a1b1a | 1794 | cifsFileInfo_get_locked(open_file); |
4477288a | 1795 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1796 | return open_file; |
2c0c2a08 SP |
1797 | } else { |
1798 | if (!inv_file) | |
1799 | inv_file = open_file; | |
9b22b0b7 | 1800 | } |
6148a742 SF |
1801 | } |
1802 | } | |
2846d386 JL |
1803 | /* couldn't find useable FH with same pid, try any available */ |
1804 | if (!any_available) { | |
1805 | any_available = true; | |
1806 | goto refind_writable; | |
1807 | } | |
2c0c2a08 SP |
1808 | |
1809 | if (inv_file) { | |
1810 | any_available = false; | |
764a1b1a | 1811 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1812 | } |
1813 | ||
4477288a | 1814 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1815 | |
1816 | if (inv_file) { | |
1817 | rc = cifs_reopen_file(inv_file, false); | |
1818 | if (!rc) | |
1819 | return inv_file; | |
1820 | else { | |
1821 | spin_lock(&cifs_file_list_lock); | |
1822 | list_move_tail(&inv_file->flist, | |
1823 | &cifs_inode->openFileList); | |
1824 | spin_unlock(&cifs_file_list_lock); | |
1825 | cifsFileInfo_put(inv_file); | |
1826 | spin_lock(&cifs_file_list_lock); | |
1827 | ++refind; | |
1828 | goto refind_writable; | |
1829 | } | |
1830 | } | |
1831 | ||
6148a742 SF |
1832 | return NULL; |
1833 | } | |
1834 | ||
1da177e4 LT |
1835 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1836 | { | |
1837 | struct address_space *mapping = page->mapping; | |
1838 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1839 | char *write_data; | |
1840 | int rc = -EFAULT; | |
1841 | int bytes_written = 0; | |
1da177e4 | 1842 | struct inode *inode; |
6148a742 | 1843 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1844 | |
1845 | if (!mapping || !mapping->host) | |
1846 | return -EFAULT; | |
1847 | ||
1848 | inode = page->mapping->host; | |
1da177e4 LT |
1849 | |
1850 | offset += (loff_t)from; | |
1851 | write_data = kmap(page); | |
1852 | write_data += from; | |
1853 | ||
1854 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1855 | kunmap(page); | |
1856 | return -EIO; | |
1857 | } | |
1858 | ||
1859 | /* racing with truncate? */ | |
1860 | if (offset > mapping->host->i_size) { | |
1861 | kunmap(page); | |
1862 | return 0; /* don't care */ | |
1863 | } | |
1864 | ||
1865 | /* check to make sure that we are not extending the file */ | |
1866 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1867 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1868 | |
6508d904 | 1869 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1870 | if (open_file) { |
fa2989f4 PS |
1871 | bytes_written = cifs_write(open_file, open_file->pid, |
1872 | write_data, to - from, &offset); | |
6ab409b5 | 1873 | cifsFileInfo_put(open_file); |
1da177e4 | 1874 | /* Does mm or vfs already set times? */ |
6148a742 | 1875 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1876 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1877 | rc = 0; |
bb5a9a04 SF |
1878 | else if (bytes_written < 0) |
1879 | rc = bytes_written; | |
6148a742 | 1880 | } else { |
f96637be | 1881 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1882 | rc = -EIO; |
1883 | } | |
1884 | ||
1885 | kunmap(page); | |
1886 | return rc; | |
1887 | } | |
1888 | ||
90ac1387 PS |
1889 | static struct cifs_writedata * |
1890 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, | |
1891 | pgoff_t end, pgoff_t *index, | |
1892 | unsigned int *found_pages) | |
1893 | { | |
1894 | unsigned int nr_pages; | |
1895 | struct page **pages; | |
1896 | struct cifs_writedata *wdata; | |
1897 | ||
1898 | wdata = cifs_writedata_alloc((unsigned int)tofind, | |
1899 | cifs_writev_complete); | |
1900 | if (!wdata) | |
1901 | return NULL; | |
1902 | ||
1903 | /* | |
1904 | * find_get_pages_tag seems to return a max of 256 on each | |
1905 | * iteration, so we must call it several times in order to | |
1906 | * fill the array or the wsize is effectively limited to | |
1907 | * 256 * PAGE_CACHE_SIZE. | |
1908 | */ | |
1909 | *found_pages = 0; | |
1910 | pages = wdata->pages; | |
1911 | do { | |
1912 | nr_pages = find_get_pages_tag(mapping, index, | |
1913 | PAGECACHE_TAG_DIRTY, tofind, | |
1914 | pages); | |
1915 | *found_pages += nr_pages; | |
1916 | tofind -= nr_pages; | |
1917 | pages += nr_pages; | |
1918 | } while (nr_pages && tofind && *index <= end); | |
1919 | ||
1920 | return wdata; | |
1921 | } | |
1922 | ||
7e48ff82 PS |
1923 | static unsigned int |
1924 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, | |
1925 | struct address_space *mapping, | |
1926 | struct writeback_control *wbc, | |
1927 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) | |
1928 | { | |
1929 | unsigned int nr_pages = 0, i; | |
1930 | struct page *page; | |
1931 | ||
1932 | for (i = 0; i < found_pages; i++) { | |
1933 | page = wdata->pages[i]; | |
1934 | /* | |
1935 | * At this point we hold neither mapping->tree_lock nor | |
1936 | * lock on the page itself: the page may be truncated or | |
1937 | * invalidated (changing page->mapping to NULL), or even | |
1938 | * swizzled back from swapper_space to tmpfs file | |
1939 | * mapping | |
1940 | */ | |
1941 | ||
1942 | if (nr_pages == 0) | |
1943 | lock_page(page); | |
1944 | else if (!trylock_page(page)) | |
1945 | break; | |
1946 | ||
1947 | if (unlikely(page->mapping != mapping)) { | |
1948 | unlock_page(page); | |
1949 | break; | |
1950 | } | |
1951 | ||
1952 | if (!wbc->range_cyclic && page->index > end) { | |
1953 | *done = true; | |
1954 | unlock_page(page); | |
1955 | break; | |
1956 | } | |
1957 | ||
1958 | if (*next && (page->index != *next)) { | |
1959 | /* Not next consecutive page */ | |
1960 | unlock_page(page); | |
1961 | break; | |
1962 | } | |
1963 | ||
1964 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1965 | wait_on_page_writeback(page); | |
1966 | ||
1967 | if (PageWriteback(page) || | |
1968 | !clear_page_dirty_for_io(page)) { | |
1969 | unlock_page(page); | |
1970 | break; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * This actually clears the dirty bit in the radix tree. | |
1975 | * See cifs_writepage() for more commentary. | |
1976 | */ | |
1977 | set_page_writeback(page); | |
1978 | if (page_offset(page) >= i_size_read(mapping->host)) { | |
1979 | *done = true; | |
1980 | unlock_page(page); | |
1981 | end_page_writeback(page); | |
1982 | break; | |
1983 | } | |
1984 | ||
1985 | wdata->pages[i] = page; | |
1986 | *next = page->index + 1; | |
1987 | ++nr_pages; | |
1988 | } | |
1989 | ||
1990 | /* reset index to refind any pages skipped */ | |
1991 | if (nr_pages == 0) | |
1992 | *index = wdata->pages[0]->index + 1; | |
1993 | ||
1994 | /* put any pages we aren't going to use */ | |
1995 | for (i = nr_pages; i < found_pages; i++) { | |
1996 | page_cache_release(wdata->pages[i]); | |
1997 | wdata->pages[i] = NULL; | |
1998 | } | |
1999 | ||
2000 | return nr_pages; | |
2001 | } | |
2002 | ||
619aa48e PS |
2003 | static int |
2004 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, | |
2005 | struct address_space *mapping, struct writeback_control *wbc) | |
2006 | { | |
2007 | int rc = 0; | |
2008 | struct TCP_Server_Info *server; | |
2009 | unsigned int i; | |
2010 | ||
2011 | wdata->sync_mode = wbc->sync_mode; | |
2012 | wdata->nr_pages = nr_pages; | |
2013 | wdata->offset = page_offset(wdata->pages[0]); | |
2014 | wdata->pagesz = PAGE_CACHE_SIZE; | |
2015 | wdata->tailsz = min(i_size_read(mapping->host) - | |
2016 | page_offset(wdata->pages[nr_pages - 1]), | |
2017 | (loff_t)PAGE_CACHE_SIZE); | |
2018 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + wdata->tailsz; | |
2019 | ||
66231a47 PS |
2020 | if (wdata->cfile != NULL) |
2021 | cifsFileInfo_put(wdata->cfile); | |
2022 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), false); | |
2023 | if (!wdata->cfile) { | |
2024 | cifs_dbg(VFS, "No writable handles for inode\n"); | |
2025 | rc = -EBADF; | |
2026 | } else { | |
619aa48e PS |
2027 | wdata->pid = wdata->cfile->pid; |
2028 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
2029 | rc = server->ops->async_writev(wdata, cifs_writedata_release); | |
66231a47 | 2030 | } |
619aa48e PS |
2031 | |
2032 | for (i = 0; i < nr_pages; ++i) | |
2033 | unlock_page(wdata->pages[i]); | |
2034 | ||
2035 | return rc; | |
2036 | } | |
2037 | ||
1da177e4 | 2038 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 2039 | struct writeback_control *wbc) |
1da177e4 | 2040 | { |
c3d17b63 | 2041 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
cb7e9eab | 2042 | struct TCP_Server_Info *server; |
c3d17b63 JL |
2043 | bool done = false, scanned = false, range_whole = false; |
2044 | pgoff_t end, index; | |
2045 | struct cifs_writedata *wdata; | |
37c0eb46 | 2046 | int rc = 0; |
50c2f753 | 2047 | |
37c0eb46 | 2048 | /* |
c3d17b63 | 2049 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
2050 | * one page at a time via cifs_writepage |
2051 | */ | |
2052 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
2053 | return generic_writepages(mapping, wbc); | |
2054 | ||
111ebb6e | 2055 | if (wbc->range_cyclic) { |
37c0eb46 | 2056 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
2057 | end = -1; |
2058 | } else { | |
2059 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
2060 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
2061 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
2062 | range_whole = true; |
2063 | scanned = true; | |
37c0eb46 | 2064 | } |
cb7e9eab | 2065 | server = cifs_sb_master_tcon(cifs_sb)->ses->server; |
37c0eb46 | 2066 | retry: |
c3d17b63 | 2067 | while (!done && index <= end) { |
cb7e9eab | 2068 | unsigned int i, nr_pages, found_pages, wsize, credits; |
66231a47 | 2069 | pgoff_t next = 0, tofind, saved_index = index; |
c3d17b63 | 2070 | |
cb7e9eab PS |
2071 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, |
2072 | &wsize, &credits); | |
2073 | if (rc) | |
2074 | break; | |
c3d17b63 | 2075 | |
cb7e9eab | 2076 | tofind = min((wsize / PAGE_CACHE_SIZE) - 1, end - index) + 1; |
c3d17b63 | 2077 | |
90ac1387 PS |
2078 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
2079 | &found_pages); | |
c3d17b63 JL |
2080 | if (!wdata) { |
2081 | rc = -ENOMEM; | |
cb7e9eab | 2082 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2083 | break; |
2084 | } | |
2085 | ||
c3d17b63 JL |
2086 | if (found_pages == 0) { |
2087 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2088 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2089 | break; |
2090 | } | |
2091 | ||
7e48ff82 PS |
2092 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
2093 | end, &index, &next, &done); | |
37c0eb46 | 2094 | |
c3d17b63 JL |
2095 | /* nothing to write? */ |
2096 | if (nr_pages == 0) { | |
2097 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2098 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 | 2099 | continue; |
37c0eb46 | 2100 | } |
fbec9ab9 | 2101 | |
cb7e9eab | 2102 | wdata->credits = credits; |
941b853d | 2103 | |
619aa48e | 2104 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); |
f3983c21 | 2105 | |
c3d17b63 JL |
2106 | /* send failure -- clean up the mess */ |
2107 | if (rc != 0) { | |
cb7e9eab | 2108 | add_credits_and_wake_if(server, wdata->credits, 0); |
c3d17b63 | 2109 | for (i = 0; i < nr_pages; ++i) { |
941b853d | 2110 | if (rc == -EAGAIN) |
c3d17b63 JL |
2111 | redirty_page_for_writepage(wbc, |
2112 | wdata->pages[i]); | |
2113 | else | |
2114 | SetPageError(wdata->pages[i]); | |
2115 | end_page_writeback(wdata->pages[i]); | |
2116 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2117 | } |
941b853d JL |
2118 | if (rc != -EAGAIN) |
2119 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2120 | } |
2121 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2122 | |
66231a47 PS |
2123 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
2124 | index = saved_index; | |
2125 | continue; | |
2126 | } | |
2127 | ||
c3d17b63 JL |
2128 | wbc->nr_to_write -= nr_pages; |
2129 | if (wbc->nr_to_write <= 0) | |
2130 | done = true; | |
b066a48c | 2131 | |
c3d17b63 | 2132 | index = next; |
37c0eb46 | 2133 | } |
c3d17b63 | 2134 | |
37c0eb46 SF |
2135 | if (!scanned && !done) { |
2136 | /* | |
2137 | * We hit the last page and there is more work to be done: wrap | |
2138 | * back to the start of the file | |
2139 | */ | |
c3d17b63 | 2140 | scanned = true; |
37c0eb46 SF |
2141 | index = 0; |
2142 | goto retry; | |
2143 | } | |
c3d17b63 | 2144 | |
111ebb6e | 2145 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2146 | mapping->writeback_index = index; |
2147 | ||
1da177e4 LT |
2148 | return rc; |
2149 | } | |
1da177e4 | 2150 | |
9ad1506b PS |
2151 | static int |
2152 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2153 | { |
9ad1506b | 2154 | int rc; |
6d5786a3 | 2155 | unsigned int xid; |
1da177e4 | 2156 | |
6d5786a3 | 2157 | xid = get_xid(); |
1da177e4 LT |
2158 | /* BB add check for wbc flags */ |
2159 | page_cache_get(page); | |
ad7a2926 | 2160 | if (!PageUptodate(page)) |
f96637be | 2161 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2162 | |
2163 | /* | |
2164 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2165 | * | |
2166 | * A writepage() implementation always needs to do either this, | |
2167 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2168 | * the case of a failure. | |
2169 | * | |
2170 | * Just unlocking the page will cause the radix tree tag-bits | |
2171 | * to fail to update with the state of the page correctly. | |
2172 | */ | |
fb8c4b14 | 2173 | set_page_writeback(page); |
9ad1506b | 2174 | retry_write: |
1da177e4 | 2175 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2176 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2177 | goto retry_write; | |
2178 | else if (rc == -EAGAIN) | |
2179 | redirty_page_for_writepage(wbc, page); | |
2180 | else if (rc != 0) | |
2181 | SetPageError(page); | |
2182 | else | |
2183 | SetPageUptodate(page); | |
cb876f45 LT |
2184 | end_page_writeback(page); |
2185 | page_cache_release(page); | |
6d5786a3 | 2186 | free_xid(xid); |
1da177e4 LT |
2187 | return rc; |
2188 | } | |
2189 | ||
9ad1506b PS |
2190 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2191 | { | |
2192 | int rc = cifs_writepage_locked(page, wbc); | |
2193 | unlock_page(page); | |
2194 | return rc; | |
2195 | } | |
2196 | ||
d9414774 NP |
2197 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2198 | loff_t pos, unsigned len, unsigned copied, | |
2199 | struct page *page, void *fsdata) | |
1da177e4 | 2200 | { |
d9414774 NP |
2201 | int rc; |
2202 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2203 | struct cifsFileInfo *cfile = file->private_data; |
2204 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2205 | __u32 pid; | |
2206 | ||
2207 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2208 | pid = cfile->pid; | |
2209 | else | |
2210 | pid = current->tgid; | |
1da177e4 | 2211 | |
f96637be | 2212 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2213 | page, pos, copied); |
d9414774 | 2214 | |
a98ee8c1 JL |
2215 | if (PageChecked(page)) { |
2216 | if (copied == len) | |
2217 | SetPageUptodate(page); | |
2218 | ClearPageChecked(page); | |
2219 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2220 | SetPageUptodate(page); |
ad7a2926 | 2221 | |
1da177e4 | 2222 | if (!PageUptodate(page)) { |
d9414774 NP |
2223 | char *page_data; |
2224 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2225 | unsigned int xid; |
d9414774 | 2226 | |
6d5786a3 | 2227 | xid = get_xid(); |
1da177e4 LT |
2228 | /* this is probably better than directly calling |
2229 | partialpage_write since in this function the file handle is | |
2230 | known which we might as well leverage */ | |
2231 | /* BB check if anything else missing out of ppw | |
2232 | such as updating last write time */ | |
2233 | page_data = kmap(page); | |
d4ffff1f | 2234 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2235 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2236 | kunmap(page); |
d9414774 | 2237 | |
6d5786a3 | 2238 | free_xid(xid); |
fb8c4b14 | 2239 | } else { |
d9414774 NP |
2240 | rc = copied; |
2241 | pos += copied; | |
ca8aa29c | 2242 | set_page_dirty(page); |
1da177e4 LT |
2243 | } |
2244 | ||
d9414774 NP |
2245 | if (rc > 0) { |
2246 | spin_lock(&inode->i_lock); | |
2247 | if (pos > inode->i_size) | |
2248 | i_size_write(inode, pos); | |
2249 | spin_unlock(&inode->i_lock); | |
2250 | } | |
2251 | ||
2252 | unlock_page(page); | |
2253 | page_cache_release(page); | |
2254 | ||
1da177e4 LT |
2255 | return rc; |
2256 | } | |
2257 | ||
02c24a82 JB |
2258 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2259 | int datasync) | |
1da177e4 | 2260 | { |
6d5786a3 | 2261 | unsigned int xid; |
1da177e4 | 2262 | int rc = 0; |
96daf2b0 | 2263 | struct cifs_tcon *tcon; |
1d8c4c00 | 2264 | struct TCP_Server_Info *server; |
c21dfb69 | 2265 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2266 | struct inode *inode = file_inode(file); |
8be7e6ba | 2267 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2268 | |
02c24a82 JB |
2269 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2270 | if (rc) | |
2271 | return rc; | |
2272 | mutex_lock(&inode->i_mutex); | |
2273 | ||
6d5786a3 | 2274 | xid = get_xid(); |
1da177e4 | 2275 | |
f96637be JP |
2276 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2277 | file->f_path.dentry->d_name.name, datasync); | |
50c2f753 | 2278 | |
18cceb6a | 2279 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 2280 | rc = cifs_zap_mapping(inode); |
6feb9891 | 2281 | if (rc) { |
f96637be | 2282 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2283 | rc = 0; /* don't care about it in fsync */ |
2284 | } | |
2285 | } | |
eb4b756b | 2286 | |
8be7e6ba | 2287 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2288 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2289 | server = tcon->ses->server; | |
2290 | if (server->ops->flush) | |
2291 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2292 | else | |
2293 | rc = -ENOSYS; | |
2294 | } | |
8be7e6ba | 2295 | |
6d5786a3 | 2296 | free_xid(xid); |
02c24a82 | 2297 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2298 | return rc; |
2299 | } | |
2300 | ||
02c24a82 | 2301 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2302 | { |
6d5786a3 | 2303 | unsigned int xid; |
8be7e6ba | 2304 | int rc = 0; |
96daf2b0 | 2305 | struct cifs_tcon *tcon; |
1d8c4c00 | 2306 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2307 | struct cifsFileInfo *smbfile = file->private_data; |
2308 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2309 | struct inode *inode = file->f_mapping->host; |
2310 | ||
2311 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2312 | if (rc) | |
2313 | return rc; | |
2314 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2315 | |
6d5786a3 | 2316 | xid = get_xid(); |
8be7e6ba | 2317 | |
f96637be JP |
2318 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2319 | file->f_path.dentry->d_name.name, datasync); | |
8be7e6ba PS |
2320 | |
2321 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2322 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2323 | server = tcon->ses->server; | |
2324 | if (server->ops->flush) | |
2325 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2326 | else | |
2327 | rc = -ENOSYS; | |
2328 | } | |
b298f223 | 2329 | |
6d5786a3 | 2330 | free_xid(xid); |
02c24a82 | 2331 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2332 | return rc; |
2333 | } | |
2334 | ||
1da177e4 LT |
2335 | /* |
2336 | * As file closes, flush all cached write data for this inode checking | |
2337 | * for write behind errors. | |
2338 | */ | |
75e1fcc0 | 2339 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2340 | { |
496ad9aa | 2341 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2342 | int rc = 0; |
2343 | ||
eb4b756b | 2344 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2345 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2346 | |
f96637be | 2347 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2348 | |
2349 | return rc; | |
2350 | } | |
2351 | ||
72432ffc PS |
2352 | static int |
2353 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2354 | { | |
2355 | int rc = 0; | |
2356 | unsigned long i; | |
2357 | ||
2358 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2359 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2360 | if (!pages[i]) { |
2361 | /* | |
2362 | * save number of pages we have already allocated and | |
2363 | * return with ENOMEM error | |
2364 | */ | |
2365 | num_pages = i; | |
2366 | rc = -ENOMEM; | |
e94f7ba1 | 2367 | break; |
72432ffc PS |
2368 | } |
2369 | } | |
2370 | ||
e94f7ba1 JL |
2371 | if (rc) { |
2372 | for (i = 0; i < num_pages; i++) | |
2373 | put_page(pages[i]); | |
2374 | } | |
72432ffc PS |
2375 | return rc; |
2376 | } | |
2377 | ||
2378 | static inline | |
2379 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2380 | { | |
2381 | size_t num_pages; | |
2382 | size_t clen; | |
2383 | ||
2384 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2385 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2386 | |
2387 | if (cur_len) | |
2388 | *cur_len = clen; | |
2389 | ||
2390 | return num_pages; | |
2391 | } | |
2392 | ||
da82f7e7 | 2393 | static void |
4a5c80d7 | 2394 | cifs_uncached_writedata_release(struct kref *refcount) |
da82f7e7 JL |
2395 | { |
2396 | int i; | |
4a5c80d7 SF |
2397 | struct cifs_writedata *wdata = container_of(refcount, |
2398 | struct cifs_writedata, refcount); | |
2399 | ||
2400 | for (i = 0; i < wdata->nr_pages; i++) | |
2401 | put_page(wdata->pages[i]); | |
2402 | cifs_writedata_release(refcount); | |
2403 | } | |
2404 | ||
2405 | static void | |
2406 | cifs_uncached_writev_complete(struct work_struct *work) | |
2407 | { | |
da82f7e7 JL |
2408 | struct cifs_writedata *wdata = container_of(work, |
2409 | struct cifs_writedata, work); | |
2410 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2411 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2412 | ||
2413 | spin_lock(&inode->i_lock); | |
2414 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2415 | if (cifsi->server_eof > inode->i_size) | |
2416 | i_size_write(inode, cifsi->server_eof); | |
2417 | spin_unlock(&inode->i_lock); | |
2418 | ||
2419 | complete(&wdata->done); | |
2420 | ||
4a5c80d7 | 2421 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
da82f7e7 JL |
2422 | } |
2423 | ||
da82f7e7 | 2424 | static int |
66386c08 PS |
2425 | wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from, |
2426 | size_t *len, unsigned long *num_pages) | |
da82f7e7 | 2427 | { |
66386c08 PS |
2428 | size_t save_len, copied, bytes, cur_len = *len; |
2429 | unsigned long i, nr_pages = *num_pages; | |
c9de5c80 | 2430 | |
66386c08 PS |
2431 | save_len = cur_len; |
2432 | for (i = 0; i < nr_pages; i++) { | |
2433 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); | |
2434 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from); | |
2435 | cur_len -= copied; | |
2436 | /* | |
2437 | * If we didn't copy as much as we expected, then that | |
2438 | * may mean we trod into an unmapped area. Stop copying | |
2439 | * at that point. On the next pass through the big | |
2440 | * loop, we'll likely end up getting a zero-length | |
2441 | * write and bailing out of it. | |
2442 | */ | |
2443 | if (copied < bytes) | |
2444 | break; | |
2445 | } | |
2446 | cur_len = save_len - cur_len; | |
2447 | *len = cur_len; | |
da82f7e7 | 2448 | |
66386c08 PS |
2449 | /* |
2450 | * If we have no data to send, then that probably means that | |
2451 | * the copy above failed altogether. That's most likely because | |
2452 | * the address in the iovec was bogus. Return -EFAULT and let | |
2453 | * the caller free anything we allocated and bail out. | |
2454 | */ | |
2455 | if (!cur_len) | |
2456 | return -EFAULT; | |
da82f7e7 | 2457 | |
66386c08 PS |
2458 | /* |
2459 | * i + 1 now represents the number of pages we actually used in | |
2460 | * the copy phase above. | |
2461 | */ | |
2462 | *num_pages = i + 1; | |
2463 | return 0; | |
da82f7e7 JL |
2464 | } |
2465 | ||
43de94ea PS |
2466 | static int |
2467 | cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, | |
2468 | struct cifsFileInfo *open_file, | |
2469 | struct cifs_sb_info *cifs_sb, struct list_head *wdata_list) | |
72432ffc | 2470 | { |
43de94ea PS |
2471 | int rc = 0; |
2472 | size_t cur_len; | |
66386c08 | 2473 | unsigned long nr_pages, num_pages, i; |
43de94ea | 2474 | struct cifs_writedata *wdata; |
6ec0b01b PS |
2475 | struct iov_iter saved_from; |
2476 | loff_t saved_offset = offset; | |
da82f7e7 | 2477 | pid_t pid; |
6ec0b01b | 2478 | struct TCP_Server_Info *server; |
d4ffff1f PS |
2479 | |
2480 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2481 | pid = open_file->pid; | |
2482 | else | |
2483 | pid = current->tgid; | |
2484 | ||
6ec0b01b PS |
2485 | server = tlink_tcon(open_file->tlink)->ses->server; |
2486 | memcpy(&saved_from, from, sizeof(struct iov_iter)); | |
2487 | ||
72432ffc | 2488 | do { |
cb7e9eab PS |
2489 | unsigned int wsize, credits; |
2490 | ||
2491 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, | |
2492 | &wsize, &credits); | |
2493 | if (rc) | |
2494 | break; | |
da82f7e7 | 2495 | |
cb7e9eab | 2496 | nr_pages = get_numpages(wsize, len, &cur_len); |
da82f7e7 JL |
2497 | wdata = cifs_writedata_alloc(nr_pages, |
2498 | cifs_uncached_writev_complete); | |
2499 | if (!wdata) { | |
2500 | rc = -ENOMEM; | |
cb7e9eab | 2501 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2502 | break; |
2503 | } | |
2504 | ||
2505 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2506 | if (rc) { | |
2507 | kfree(wdata); | |
cb7e9eab | 2508 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2509 | break; |
2510 | } | |
2511 | ||
66386c08 PS |
2512 | num_pages = nr_pages; |
2513 | rc = wdata_fill_from_iovec(wdata, from, &cur_len, &num_pages); | |
2514 | if (rc) { | |
5d81de8e JL |
2515 | for (i = 0; i < nr_pages; i++) |
2516 | put_page(wdata->pages[i]); | |
2517 | kfree(wdata); | |
cb7e9eab | 2518 | add_credits_and_wake_if(server, credits, 0); |
5d81de8e JL |
2519 | break; |
2520 | } | |
2521 | ||
2522 | /* | |
66386c08 PS |
2523 | * Bring nr_pages down to the number of pages we actually used, |
2524 | * and free any pages that we didn't use. | |
5d81de8e | 2525 | */ |
66386c08 | 2526 | for ( ; nr_pages > num_pages; nr_pages--) |
5d81de8e JL |
2527 | put_page(wdata->pages[nr_pages - 1]); |
2528 | ||
da82f7e7 JL |
2529 | wdata->sync_mode = WB_SYNC_ALL; |
2530 | wdata->nr_pages = nr_pages; | |
2531 | wdata->offset = (__u64)offset; | |
2532 | wdata->cfile = cifsFileInfo_get(open_file); | |
2533 | wdata->pid = pid; | |
2534 | wdata->bytes = cur_len; | |
eddb079d JL |
2535 | wdata->pagesz = PAGE_SIZE; |
2536 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
cb7e9eab | 2537 | wdata->credits = credits; |
6ec0b01b PS |
2538 | |
2539 | if (!wdata->cfile->invalidHandle || | |
2540 | !cifs_reopen_file(wdata->cfile, false)) | |
2541 | rc = server->ops->async_writev(wdata, | |
2542 | cifs_uncached_writedata_release); | |
da82f7e7 | 2543 | if (rc) { |
cb7e9eab | 2544 | add_credits_and_wake_if(server, wdata->credits, 0); |
4a5c80d7 SF |
2545 | kref_put(&wdata->refcount, |
2546 | cifs_uncached_writedata_release); | |
6ec0b01b PS |
2547 | if (rc == -EAGAIN) { |
2548 | memcpy(from, &saved_from, | |
2549 | sizeof(struct iov_iter)); | |
2550 | iov_iter_advance(from, offset - saved_offset); | |
2551 | continue; | |
2552 | } | |
72432ffc PS |
2553 | break; |
2554 | } | |
2555 | ||
43de94ea | 2556 | list_add_tail(&wdata->list, wdata_list); |
da82f7e7 JL |
2557 | offset += cur_len; |
2558 | len -= cur_len; | |
72432ffc PS |
2559 | } while (len > 0); |
2560 | ||
43de94ea PS |
2561 | return rc; |
2562 | } | |
2563 | ||
2564 | static ssize_t | |
2565 | cifs_iovec_write(struct file *file, struct iov_iter *from, loff_t *poffset) | |
2566 | { | |
2567 | size_t len; | |
2568 | ssize_t total_written = 0; | |
2569 | struct cifsFileInfo *open_file; | |
2570 | struct cifs_tcon *tcon; | |
2571 | struct cifs_sb_info *cifs_sb; | |
2572 | struct cifs_writedata *wdata, *tmp; | |
2573 | struct list_head wdata_list; | |
6ec0b01b | 2574 | struct iov_iter saved_from; |
43de94ea PS |
2575 | int rc; |
2576 | ||
2577 | len = iov_iter_count(from); | |
2578 | rc = generic_write_checks(file, poffset, &len, 0); | |
2579 | if (rc) | |
2580 | return rc; | |
2581 | ||
2582 | if (!len) | |
2583 | return 0; | |
2584 | ||
2585 | iov_iter_truncate(from, len); | |
2586 | ||
2587 | INIT_LIST_HEAD(&wdata_list); | |
2588 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
2589 | open_file = file->private_data; | |
2590 | tcon = tlink_tcon(open_file->tlink); | |
2591 | ||
2592 | if (!tcon->ses->server->ops->async_writev) | |
2593 | return -ENOSYS; | |
2594 | ||
6ec0b01b PS |
2595 | memcpy(&saved_from, from, sizeof(struct iov_iter)); |
2596 | ||
43de94ea PS |
2597 | rc = cifs_write_from_iter(*poffset, len, from, open_file, cifs_sb, |
2598 | &wdata_list); | |
2599 | ||
da82f7e7 JL |
2600 | /* |
2601 | * If at least one write was successfully sent, then discard any rc | |
2602 | * value from the later writes. If the other write succeeds, then | |
2603 | * we'll end up returning whatever was written. If it fails, then | |
2604 | * we'll get a new rc value from that. | |
2605 | */ | |
2606 | if (!list_empty(&wdata_list)) | |
2607 | rc = 0; | |
2608 | ||
2609 | /* | |
2610 | * Wait for and collect replies for any successful sends in order of | |
2611 | * increasing offset. Once an error is hit or we get a fatal signal | |
2612 | * while waiting, then return without waiting for any more replies. | |
2613 | */ | |
2614 | restart_loop: | |
2615 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2616 | if (!rc) { | |
2617 | /* FIXME: freezable too? */ | |
2618 | rc = wait_for_completion_killable(&wdata->done); | |
2619 | if (rc) | |
2620 | rc = -EINTR; | |
2621 | else if (wdata->result) | |
2622 | rc = wdata->result; | |
2623 | else | |
2624 | total_written += wdata->bytes; | |
2625 | ||
2626 | /* resend call if it's a retryable error */ | |
2627 | if (rc == -EAGAIN) { | |
6ec0b01b PS |
2628 | struct list_head tmp_list; |
2629 | struct iov_iter tmp_from; | |
2630 | ||
2631 | INIT_LIST_HEAD(&tmp_list); | |
2632 | list_del_init(&wdata->list); | |
2633 | ||
2634 | memcpy(&tmp_from, &saved_from, | |
2635 | sizeof(struct iov_iter)); | |
2636 | iov_iter_advance(&tmp_from, | |
2637 | wdata->offset - *poffset); | |
2638 | ||
2639 | rc = cifs_write_from_iter(wdata->offset, | |
2640 | wdata->bytes, &tmp_from, | |
2641 | open_file, cifs_sb, &tmp_list); | |
2642 | ||
2643 | list_splice(&tmp_list, &wdata_list); | |
2644 | ||
2645 | kref_put(&wdata->refcount, | |
2646 | cifs_uncached_writedata_release); | |
da82f7e7 JL |
2647 | goto restart_loop; |
2648 | } | |
2649 | } | |
2650 | list_del_init(&wdata->list); | |
4a5c80d7 | 2651 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
72432ffc PS |
2652 | } |
2653 | ||
da82f7e7 JL |
2654 | if (total_written > 0) |
2655 | *poffset += total_written; | |
72432ffc | 2656 | |
da82f7e7 JL |
2657 | cifs_stats_bytes_written(tcon, total_written); |
2658 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2659 | } |
2660 | ||
3dae8750 | 2661 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc PS |
2662 | { |
2663 | ssize_t written; | |
2664 | struct inode *inode; | |
3dae8750 | 2665 | loff_t pos = iocb->ki_pos; |
72432ffc | 2666 | |
496ad9aa | 2667 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2668 | |
2669 | /* | |
2670 | * BB - optimize the way when signing is disabled. We can drop this | |
2671 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2672 | * write request. | |
2673 | */ | |
2674 | ||
3dae8750 | 2675 | written = cifs_iovec_write(iocb->ki_filp, from, &pos); |
72432ffc | 2676 | if (written > 0) { |
aff8d5ca | 2677 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags); |
72432ffc PS |
2678 | iocb->ki_pos = pos; |
2679 | } | |
2680 | ||
2681 | return written; | |
2682 | } | |
2683 | ||
579f9053 | 2684 | static ssize_t |
3dae8750 | 2685 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc | 2686 | { |
579f9053 PS |
2687 | struct file *file = iocb->ki_filp; |
2688 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2689 | struct inode *inode = file->f_mapping->host; | |
2690 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2691 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2692 | ssize_t rc = -EACCES; | |
19dfc1f5 | 2693 | loff_t lock_pos = iocb->ki_pos; |
72432ffc | 2694 | |
579f9053 PS |
2695 | /* |
2696 | * We need to hold the sem to be sure nobody modifies lock list | |
2697 | * with a brlock that prevents writing. | |
2698 | */ | |
2699 | down_read(&cinode->lock_sem); | |
19dfc1f5 AV |
2700 | mutex_lock(&inode->i_mutex); |
2701 | if (file->f_flags & O_APPEND) | |
2702 | lock_pos = i_size_read(inode); | |
3dae8750 | 2703 | if (!cifs_find_lock_conflict(cfile, lock_pos, iov_iter_count(from), |
579f9053 | 2704 | server->vals->exclusive_lock_type, NULL, |
19dfc1f5 | 2705 | CIFS_WRITE_OP)) { |
3dae8750 | 2706 | rc = __generic_file_write_iter(iocb, from); |
19dfc1f5 AV |
2707 | mutex_unlock(&inode->i_mutex); |
2708 | ||
2709 | if (rc > 0) { | |
2710 | ssize_t err; | |
2711 | ||
2712 | err = generic_write_sync(file, iocb->ki_pos - rc, rc); | |
1f80c0cc | 2713 | if (err < 0) |
19dfc1f5 AV |
2714 | rc = err; |
2715 | } | |
2716 | } else { | |
2717 | mutex_unlock(&inode->i_mutex); | |
2718 | } | |
579f9053 | 2719 | up_read(&cinode->lock_sem); |
579f9053 PS |
2720 | return rc; |
2721 | } | |
2722 | ||
2723 | ssize_t | |
3dae8750 | 2724 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
579f9053 | 2725 | { |
496ad9aa | 2726 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2727 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2728 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2729 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2730 | iocb->ki_filp->private_data; | |
2731 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2732 | ssize_t written; |
ca8aa29c | 2733 | |
c11f1df5 SP |
2734 | written = cifs_get_writer(cinode); |
2735 | if (written) | |
2736 | return written; | |
2737 | ||
18cceb6a | 2738 | if (CIFS_CACHE_WRITE(cinode)) { |
88cf75aa PS |
2739 | if (cap_unix(tcon->ses) && |
2740 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
c11f1df5 | 2741 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
3dae8750 | 2742 | written = generic_file_write_iter(iocb, from); |
c11f1df5 SP |
2743 | goto out; |
2744 | } | |
3dae8750 | 2745 | written = cifs_writev(iocb, from); |
c11f1df5 | 2746 | goto out; |
25078105 | 2747 | } |
25078105 | 2748 | /* |
ca8aa29c PS |
2749 | * For non-oplocked files in strict cache mode we need to write the data |
2750 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2751 | * affected pages because it may cause a error with mandatory locks on | |
2752 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2753 | */ |
3dae8750 | 2754 | written = cifs_user_writev(iocb, from); |
18cceb6a | 2755 | if (written > 0 && CIFS_CACHE_READ(cinode)) { |
88cf75aa PS |
2756 | /* |
2757 | * Windows 7 server can delay breaking level2 oplock if a write | |
2758 | * request comes - break it on the client to prevent reading | |
2759 | * an old data. | |
2760 | */ | |
4f73c7d3 | 2761 | cifs_zap_mapping(inode); |
f96637be JP |
2762 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2763 | inode); | |
18cceb6a | 2764 | cinode->oplock = 0; |
88cf75aa | 2765 | } |
c11f1df5 SP |
2766 | out: |
2767 | cifs_put_writer(cinode); | |
88cf75aa | 2768 | return written; |
72432ffc PS |
2769 | } |
2770 | ||
0471ca3f | 2771 | static struct cifs_readdata * |
f4e49cd2 | 2772 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2773 | { |
2774 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2775 | |
c5fab6f4 JL |
2776 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2777 | GFP_KERNEL); | |
0471ca3f | 2778 | if (rdata != NULL) { |
6993f74a | 2779 | kref_init(&rdata->refcount); |
1c892549 JL |
2780 | INIT_LIST_HEAD(&rdata->list); |
2781 | init_completion(&rdata->done); | |
0471ca3f | 2782 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2783 | } |
f4e49cd2 | 2784 | |
0471ca3f JL |
2785 | return rdata; |
2786 | } | |
2787 | ||
6993f74a JL |
2788 | void |
2789 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2790 | { |
6993f74a JL |
2791 | struct cifs_readdata *rdata = container_of(refcount, |
2792 | struct cifs_readdata, refcount); | |
2793 | ||
2794 | if (rdata->cfile) | |
2795 | cifsFileInfo_put(rdata->cfile); | |
2796 | ||
0471ca3f JL |
2797 | kfree(rdata); |
2798 | } | |
2799 | ||
1c892549 | 2800 | static int |
c5fab6f4 | 2801 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2802 | { |
2803 | int rc = 0; | |
c5fab6f4 | 2804 | struct page *page; |
1c892549 JL |
2805 | unsigned int i; |
2806 | ||
c5fab6f4 | 2807 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2808 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2809 | if (!page) { | |
2810 | rc = -ENOMEM; | |
2811 | break; | |
2812 | } | |
c5fab6f4 | 2813 | rdata->pages[i] = page; |
1c892549 JL |
2814 | } |
2815 | ||
2816 | if (rc) { | |
c5fab6f4 JL |
2817 | for (i = 0; i < nr_pages; i++) { |
2818 | put_page(rdata->pages[i]); | |
2819 | rdata->pages[i] = NULL; | |
1c892549 JL |
2820 | } |
2821 | } | |
2822 | return rc; | |
2823 | } | |
2824 | ||
2825 | static void | |
2826 | cifs_uncached_readdata_release(struct kref *refcount) | |
2827 | { | |
1c892549 JL |
2828 | struct cifs_readdata *rdata = container_of(refcount, |
2829 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2830 | unsigned int i; |
1c892549 | 2831 | |
c5fab6f4 JL |
2832 | for (i = 0; i < rdata->nr_pages; i++) { |
2833 | put_page(rdata->pages[i]); | |
2834 | rdata->pages[i] = NULL; | |
1c892549 JL |
2835 | } |
2836 | cifs_readdata_release(refcount); | |
2837 | } | |
2838 | ||
1c892549 JL |
2839 | /** |
2840 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2841 | * @rdata: the readdata response with list of pages holding data | |
7f25bba8 | 2842 | * @iter: destination for our data |
1c892549 JL |
2843 | * |
2844 | * This function copies data from a list of pages in a readdata response into | |
2845 | * an array of iovecs. It will first calculate where the data should go | |
2846 | * based on the info in the readdata and then copy the data into that spot. | |
2847 | */ | |
7f25bba8 AV |
2848 | static int |
2849 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) | |
1c892549 | 2850 | { |
34a54d61 | 2851 | size_t remaining = rdata->got_bytes; |
c5fab6f4 | 2852 | unsigned int i; |
1c892549 | 2853 | |
c5fab6f4 | 2854 | for (i = 0; i < rdata->nr_pages; i++) { |
c5fab6f4 | 2855 | struct page *page = rdata->pages[i]; |
e686bd8d | 2856 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
7f25bba8 AV |
2857 | size_t written = copy_page_to_iter(page, 0, copy, iter); |
2858 | remaining -= written; | |
2859 | if (written < copy && iov_iter_count(iter) > 0) | |
2860 | break; | |
1c892549 | 2861 | } |
7f25bba8 | 2862 | return remaining ? -EFAULT : 0; |
1c892549 JL |
2863 | } |
2864 | ||
2865 | static void | |
2866 | cifs_uncached_readv_complete(struct work_struct *work) | |
2867 | { | |
2868 | struct cifs_readdata *rdata = container_of(work, | |
2869 | struct cifs_readdata, work); | |
1c892549 JL |
2870 | |
2871 | complete(&rdata->done); | |
2872 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2873 | } | |
2874 | ||
2875 | static int | |
8321fec4 JL |
2876 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2877 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2878 | { |
b3160aeb | 2879 | int result = 0; |
c5fab6f4 JL |
2880 | unsigned int i; |
2881 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2882 | struct kvec iov; |
1c892549 | 2883 | |
b3160aeb | 2884 | rdata->got_bytes = 0; |
8321fec4 | 2885 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2886 | for (i = 0; i < nr_pages; i++) { |
2887 | struct page *page = rdata->pages[i]; | |
2888 | ||
8321fec4 | 2889 | if (len >= PAGE_SIZE) { |
1c892549 | 2890 | /* enough data to fill the page */ |
8321fec4 JL |
2891 | iov.iov_base = kmap(page); |
2892 | iov.iov_len = PAGE_SIZE; | |
f96637be JP |
2893 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2894 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2895 | len -= PAGE_SIZE; |
2896 | } else if (len > 0) { | |
1c892549 | 2897 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2898 | iov.iov_base = kmap(page); |
2899 | iov.iov_len = len; | |
f96637be JP |
2900 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2901 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2902 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); |
2903 | rdata->tailsz = len; | |
2904 | len = 0; | |
1c892549 JL |
2905 | } else { |
2906 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2907 | rdata->pages[i] = NULL; |
2908 | rdata->nr_pages--; | |
1c892549 | 2909 | put_page(page); |
8321fec4 | 2910 | continue; |
1c892549 | 2911 | } |
8321fec4 JL |
2912 | |
2913 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2914 | kunmap(page); | |
2915 | if (result < 0) | |
2916 | break; | |
2917 | ||
b3160aeb | 2918 | rdata->got_bytes += result; |
1c892549 JL |
2919 | } |
2920 | ||
b3160aeb PS |
2921 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
2922 | rdata->got_bytes : result; | |
1c892549 JL |
2923 | } |
2924 | ||
0ada36b2 PS |
2925 | static int |
2926 | cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, | |
2927 | struct cifs_sb_info *cifs_sb, struct list_head *rdata_list) | |
1da177e4 | 2928 | { |
0ada36b2 | 2929 | struct cifs_readdata *rdata; |
bed9da02 | 2930 | unsigned int npages, rsize, credits; |
0ada36b2 PS |
2931 | size_t cur_len; |
2932 | int rc; | |
1c892549 | 2933 | pid_t pid; |
25f40259 | 2934 | struct TCP_Server_Info *server; |
a70307ee | 2935 | |
25f40259 | 2936 | server = tlink_tcon(open_file->tlink)->ses->server; |
fc9c5966 | 2937 | |
d4ffff1f PS |
2938 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2939 | pid = open_file->pid; | |
2940 | else | |
2941 | pid = current->tgid; | |
2942 | ||
1c892549 | 2943 | do { |
bed9da02 PS |
2944 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
2945 | &rsize, &credits); | |
2946 | if (rc) | |
2947 | break; | |
2948 | ||
2949 | cur_len = min_t(const size_t, len, rsize); | |
1c892549 | 2950 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); |
a70307ee | 2951 | |
1c892549 JL |
2952 | /* allocate a readdata struct */ |
2953 | rdata = cifs_readdata_alloc(npages, | |
2954 | cifs_uncached_readv_complete); | |
2955 | if (!rdata) { | |
bed9da02 | 2956 | add_credits_and_wake_if(server, credits, 0); |
1c892549 | 2957 | rc = -ENOMEM; |
bae9f746 | 2958 | break; |
1da177e4 | 2959 | } |
a70307ee | 2960 | |
c5fab6f4 | 2961 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2962 | if (rc) |
2963 | goto error; | |
2964 | ||
2965 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2966 | rdata->nr_pages = npages; |
1c892549 JL |
2967 | rdata->offset = offset; |
2968 | rdata->bytes = cur_len; | |
2969 | rdata->pid = pid; | |
8321fec4 JL |
2970 | rdata->pagesz = PAGE_SIZE; |
2971 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
bed9da02 | 2972 | rdata->credits = credits; |
1c892549 | 2973 | |
25f40259 PS |
2974 | if (!rdata->cfile->invalidHandle || |
2975 | !cifs_reopen_file(rdata->cfile, true)) | |
2976 | rc = server->ops->async_readv(rdata); | |
1c892549 JL |
2977 | error: |
2978 | if (rc) { | |
bed9da02 | 2979 | add_credits_and_wake_if(server, rdata->credits, 0); |
1c892549 JL |
2980 | kref_put(&rdata->refcount, |
2981 | cifs_uncached_readdata_release); | |
25f40259 PS |
2982 | if (rc == -EAGAIN) |
2983 | continue; | |
1c892549 JL |
2984 | break; |
2985 | } | |
2986 | ||
0ada36b2 | 2987 | list_add_tail(&rdata->list, rdata_list); |
1c892549 JL |
2988 | offset += cur_len; |
2989 | len -= cur_len; | |
2990 | } while (len > 0); | |
2991 | ||
0ada36b2 PS |
2992 | return rc; |
2993 | } | |
2994 | ||
2995 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) | |
2996 | { | |
2997 | struct file *file = iocb->ki_filp; | |
2998 | ssize_t rc; | |
2999 | size_t len; | |
3000 | ssize_t total_read = 0; | |
3001 | loff_t offset = iocb->ki_pos; | |
3002 | struct cifs_sb_info *cifs_sb; | |
3003 | struct cifs_tcon *tcon; | |
3004 | struct cifsFileInfo *open_file; | |
3005 | struct cifs_readdata *rdata, *tmp; | |
3006 | struct list_head rdata_list; | |
3007 | ||
3008 | len = iov_iter_count(to); | |
3009 | if (!len) | |
3010 | return 0; | |
3011 | ||
3012 | INIT_LIST_HEAD(&rdata_list); | |
3013 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3014 | open_file = file->private_data; | |
3015 | tcon = tlink_tcon(open_file->tlink); | |
3016 | ||
3017 | if (!tcon->ses->server->ops->async_readv) | |
3018 | return -ENOSYS; | |
3019 | ||
3020 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
3021 | cifs_dbg(FYI, "attempting read on write only file instance\n"); | |
3022 | ||
3023 | rc = cifs_send_async_read(offset, len, open_file, cifs_sb, &rdata_list); | |
3024 | ||
1c892549 JL |
3025 | /* if at least one read request send succeeded, then reset rc */ |
3026 | if (!list_empty(&rdata_list)) | |
3027 | rc = 0; | |
3028 | ||
e6a7bcb4 | 3029 | len = iov_iter_count(to); |
1c892549 | 3030 | /* the loop below should proceed in the order of increasing offsets */ |
25f40259 | 3031 | again: |
1c892549 JL |
3032 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { |
3033 | if (!rc) { | |
1c892549 JL |
3034 | /* FIXME: freezable sleep too? */ |
3035 | rc = wait_for_completion_killable(&rdata->done); | |
3036 | if (rc) | |
3037 | rc = -EINTR; | |
fb8a3e52 | 3038 | else if (rdata->result == -EAGAIN) { |
74027f4a | 3039 | /* resend call if it's a retryable error */ |
fb8a3e52 | 3040 | struct list_head tmp_list; |
d913ed17 | 3041 | unsigned int got_bytes = rdata->got_bytes; |
25f40259 | 3042 | |
fb8a3e52 PS |
3043 | list_del_init(&rdata->list); |
3044 | INIT_LIST_HEAD(&tmp_list); | |
25f40259 | 3045 | |
d913ed17 PS |
3046 | /* |
3047 | * Got a part of data and then reconnect has | |
3048 | * happened -- fill the buffer and continue | |
3049 | * reading. | |
3050 | */ | |
3051 | if (got_bytes && got_bytes < rdata->bytes) { | |
3052 | rc = cifs_readdata_to_iov(rdata, to); | |
3053 | if (rc) { | |
3054 | kref_put(&rdata->refcount, | |
3055 | cifs_uncached_readdata_release); | |
3056 | continue; | |
3057 | } | |
74027f4a | 3058 | } |
d913ed17 PS |
3059 | |
3060 | rc = cifs_send_async_read( | |
3061 | rdata->offset + got_bytes, | |
3062 | rdata->bytes - got_bytes, | |
3063 | rdata->cfile, cifs_sb, | |
3064 | &tmp_list); | |
25f40259 | 3065 | |
fb8a3e52 | 3066 | list_splice(&tmp_list, &rdata_list); |
25f40259 | 3067 | |
fb8a3e52 PS |
3068 | kref_put(&rdata->refcount, |
3069 | cifs_uncached_readdata_release); | |
3070 | goto again; | |
3071 | } else if (rdata->result) | |
3072 | rc = rdata->result; | |
3073 | else | |
e6a7bcb4 | 3074 | rc = cifs_readdata_to_iov(rdata, to); |
1c892549 | 3075 | |
2e8a05d8 PS |
3076 | /* if there was a short read -- discard anything left */ |
3077 | if (rdata->got_bytes && rdata->got_bytes < rdata->bytes) | |
3078 | rc = -ENODATA; | |
1da177e4 | 3079 | } |
1c892549 JL |
3080 | list_del_init(&rdata->list); |
3081 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 3082 | } |
a70307ee | 3083 | |
e6a7bcb4 | 3084 | total_read = len - iov_iter_count(to); |
7f25bba8 | 3085 | |
1c892549 | 3086 | cifs_stats_bytes_read(tcon, total_read); |
1c892549 | 3087 | |
09a4707e PS |
3088 | /* mask nodata case */ |
3089 | if (rc == -ENODATA) | |
3090 | rc = 0; | |
3091 | ||
0165e810 | 3092 | if (total_read) { |
e6a7bcb4 | 3093 | iocb->ki_pos += total_read; |
0165e810 AV |
3094 | return total_read; |
3095 | } | |
3096 | return rc; | |
a70307ee PS |
3097 | } |
3098 | ||
579f9053 | 3099 | ssize_t |
e6a7bcb4 | 3100 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
a70307ee | 3101 | { |
496ad9aa | 3102 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
3103 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3104 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
3105 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
3106 | iocb->ki_filp->private_data; | |
3107 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
3108 | int rc = -EACCES; | |
a70307ee PS |
3109 | |
3110 | /* | |
3111 | * In strict cache mode we need to read from the server all the time | |
3112 | * if we don't have level II oplock because the server can delay mtime | |
3113 | * change - so we can't make a decision about inode invalidating. | |
3114 | * And we can also fail with pagereading if there are mandatory locks | |
3115 | * on pages affected by this read but not on the region from pos to | |
3116 | * pos+len-1. | |
3117 | */ | |
18cceb6a | 3118 | if (!CIFS_CACHE_READ(cinode)) |
e6a7bcb4 | 3119 | return cifs_user_readv(iocb, to); |
a70307ee | 3120 | |
579f9053 PS |
3121 | if (cap_unix(tcon->ses) && |
3122 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
3123 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
e6a7bcb4 | 3124 | return generic_file_read_iter(iocb, to); |
579f9053 PS |
3125 | |
3126 | /* | |
3127 | * We need to hold the sem to be sure nobody modifies lock list | |
3128 | * with a brlock that prevents reading. | |
3129 | */ | |
3130 | down_read(&cinode->lock_sem); | |
e6a7bcb4 | 3131 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
579f9053 | 3132 | tcon->ses->server->vals->shared_lock_type, |
081c0414 | 3133 | NULL, CIFS_READ_OP)) |
e6a7bcb4 | 3134 | rc = generic_file_read_iter(iocb, to); |
579f9053 PS |
3135 | up_read(&cinode->lock_sem); |
3136 | return rc; | |
a70307ee | 3137 | } |
1da177e4 | 3138 | |
f9c6e234 PS |
3139 | static ssize_t |
3140 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
3141 | { |
3142 | int rc = -EACCES; | |
3143 | unsigned int bytes_read = 0; | |
3144 | unsigned int total_read; | |
3145 | unsigned int current_read_size; | |
5eba8ab3 | 3146 | unsigned int rsize; |
1da177e4 | 3147 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 3148 | struct cifs_tcon *tcon; |
f9c6e234 | 3149 | struct TCP_Server_Info *server; |
6d5786a3 | 3150 | unsigned int xid; |
f9c6e234 | 3151 | char *cur_offset; |
1da177e4 | 3152 | struct cifsFileInfo *open_file; |
d4ffff1f | 3153 | struct cifs_io_parms io_parms; |
ec637e3f | 3154 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 3155 | __u32 pid; |
1da177e4 | 3156 | |
6d5786a3 | 3157 | xid = get_xid(); |
e6a00296 | 3158 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 3159 | |
5eba8ab3 JL |
3160 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3161 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3162 | ||
1da177e4 | 3163 | if (file->private_data == NULL) { |
0f3bc09e | 3164 | rc = -EBADF; |
6d5786a3 | 3165 | free_xid(xid); |
0f3bc09e | 3166 | return rc; |
1da177e4 | 3167 | } |
c21dfb69 | 3168 | open_file = file->private_data; |
29e20f9c | 3169 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3170 | server = tcon->ses->server; |
3171 | ||
3172 | if (!server->ops->sync_read) { | |
3173 | free_xid(xid); | |
3174 | return -ENOSYS; | |
3175 | } | |
1da177e4 | 3176 | |
d4ffff1f PS |
3177 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3178 | pid = open_file->pid; | |
3179 | else | |
3180 | pid = current->tgid; | |
3181 | ||
1da177e4 | 3182 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3183 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3184 | |
f9c6e234 PS |
3185 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3186 | total_read += bytes_read, cur_offset += bytes_read) { | |
e374d90f PS |
3187 | do { |
3188 | current_read_size = min_t(uint, read_size - total_read, | |
3189 | rsize); | |
3190 | /* | |
3191 | * For windows me and 9x we do not want to request more | |
3192 | * than it negotiated since it will refuse the read | |
3193 | * then. | |
3194 | */ | |
3195 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
29e20f9c | 3196 | tcon->ses->server->vals->cap_large_files)) { |
e374d90f PS |
3197 | current_read_size = min_t(uint, |
3198 | current_read_size, CIFSMaxBufSize); | |
3199 | } | |
cdff08e7 | 3200 | if (open_file->invalidHandle) { |
15886177 | 3201 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3202 | if (rc != 0) |
3203 | break; | |
3204 | } | |
d4ffff1f | 3205 | io_parms.pid = pid; |
29e20f9c | 3206 | io_parms.tcon = tcon; |
f9c6e234 | 3207 | io_parms.offset = *offset; |
d4ffff1f | 3208 | io_parms.length = current_read_size; |
f9c6e234 PS |
3209 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3210 | &bytes_read, &cur_offset, | |
3211 | &buf_type); | |
e374d90f PS |
3212 | } while (rc == -EAGAIN); |
3213 | ||
1da177e4 LT |
3214 | if (rc || (bytes_read == 0)) { |
3215 | if (total_read) { | |
3216 | break; | |
3217 | } else { | |
6d5786a3 | 3218 | free_xid(xid); |
1da177e4 LT |
3219 | return rc; |
3220 | } | |
3221 | } else { | |
29e20f9c | 3222 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3223 | *offset += bytes_read; |
1da177e4 LT |
3224 | } |
3225 | } | |
6d5786a3 | 3226 | free_xid(xid); |
1da177e4 LT |
3227 | return total_read; |
3228 | } | |
3229 | ||
ca83ce3d JL |
3230 | /* |
3231 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3232 | * sure that it doesn't change while being written back. | |
3233 | */ | |
3234 | static int | |
3235 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3236 | { | |
3237 | struct page *page = vmf->page; | |
3238 | ||
3239 | lock_page(page); | |
3240 | return VM_FAULT_LOCKED; | |
3241 | } | |
3242 | ||
3243 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3244 | .fault = filemap_fault, | |
f1820361 | 3245 | .map_pages = filemap_map_pages, |
ca83ce3d | 3246 | .page_mkwrite = cifs_page_mkwrite, |
0b173bc4 | 3247 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3248 | }; |
3249 | ||
7a6a19b1 PS |
3250 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3251 | { | |
3252 | int rc, xid; | |
496ad9aa | 3253 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3254 | |
6d5786a3 | 3255 | xid = get_xid(); |
7a6a19b1 | 3256 | |
18cceb6a | 3257 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 3258 | rc = cifs_zap_mapping(inode); |
6feb9891 PS |
3259 | if (rc) |
3260 | return rc; | |
3261 | } | |
7a6a19b1 PS |
3262 | |
3263 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3264 | if (rc == 0) |
3265 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3266 | free_xid(xid); |
7a6a19b1 PS |
3267 | return rc; |
3268 | } | |
3269 | ||
1da177e4 LT |
3270 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3271 | { | |
1da177e4 LT |
3272 | int rc, xid; |
3273 | ||
6d5786a3 | 3274 | xid = get_xid(); |
abab095d | 3275 | rc = cifs_revalidate_file(file); |
1da177e4 | 3276 | if (rc) { |
f96637be JP |
3277 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3278 | rc); | |
6d5786a3 | 3279 | free_xid(xid); |
1da177e4 LT |
3280 | return rc; |
3281 | } | |
3282 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3283 | if (rc == 0) |
3284 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3285 | free_xid(xid); |
1da177e4 LT |
3286 | return rc; |
3287 | } | |
3288 | ||
0471ca3f JL |
3289 | static void |
3290 | cifs_readv_complete(struct work_struct *work) | |
3291 | { | |
b770ddfa | 3292 | unsigned int i, got_bytes; |
0471ca3f JL |
3293 | struct cifs_readdata *rdata = container_of(work, |
3294 | struct cifs_readdata, work); | |
0471ca3f | 3295 | |
b770ddfa | 3296 | got_bytes = rdata->got_bytes; |
c5fab6f4 JL |
3297 | for (i = 0; i < rdata->nr_pages; i++) { |
3298 | struct page *page = rdata->pages[i]; | |
3299 | ||
0471ca3f JL |
3300 | lru_cache_add_file(page); |
3301 | ||
b770ddfa PS |
3302 | if (rdata->result == 0 || |
3303 | (rdata->result == -EAGAIN && got_bytes)) { | |
0471ca3f JL |
3304 | flush_dcache_page(page); |
3305 | SetPageUptodate(page); | |
3306 | } | |
3307 | ||
3308 | unlock_page(page); | |
3309 | ||
b770ddfa PS |
3310 | if (rdata->result == 0 || |
3311 | (rdata->result == -EAGAIN && got_bytes)) | |
0471ca3f JL |
3312 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
3313 | ||
b770ddfa PS |
3314 | got_bytes -= min_t(unsigned int, PAGE_CACHE_SIZE, got_bytes); |
3315 | ||
0471ca3f | 3316 | page_cache_release(page); |
c5fab6f4 | 3317 | rdata->pages[i] = NULL; |
0471ca3f | 3318 | } |
6993f74a | 3319 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3320 | } |
3321 | ||
8d5ce4d2 | 3322 | static int |
8321fec4 JL |
3323 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3324 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3325 | { |
b3160aeb | 3326 | int result = 0; |
c5fab6f4 | 3327 | unsigned int i; |
8d5ce4d2 JL |
3328 | u64 eof; |
3329 | pgoff_t eof_index; | |
c5fab6f4 | 3330 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3331 | struct kvec iov; |
8d5ce4d2 JL |
3332 | |
3333 | /* determine the eof that the server (probably) has */ | |
3334 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3335 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
f96637be | 3336 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3337 | |
b3160aeb | 3338 | rdata->got_bytes = 0; |
8321fec4 | 3339 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3340 | for (i = 0; i < nr_pages; i++) { |
3341 | struct page *page = rdata->pages[i]; | |
3342 | ||
8321fec4 | 3343 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3344 | /* enough data to fill the page */ |
8321fec4 JL |
3345 | iov.iov_base = kmap(page); |
3346 | iov.iov_len = PAGE_CACHE_SIZE; | |
f96637be JP |
3347 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3348 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3349 | len -= PAGE_CACHE_SIZE; |
3350 | } else if (len > 0) { | |
8d5ce4d2 | 3351 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3352 | iov.iov_base = kmap(page); |
3353 | iov.iov_len = len; | |
f96637be JP |
3354 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3355 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3356 | memset(iov.iov_base + len, |
3357 | '\0', PAGE_CACHE_SIZE - len); | |
3358 | rdata->tailsz = len; | |
3359 | len = 0; | |
8d5ce4d2 JL |
3360 | } else if (page->index > eof_index) { |
3361 | /* | |
3362 | * The VFS will not try to do readahead past the | |
3363 | * i_size, but it's possible that we have outstanding | |
3364 | * writes with gaps in the middle and the i_size hasn't | |
3365 | * caught up yet. Populate those with zeroed out pages | |
3366 | * to prevent the VFS from repeatedly attempting to | |
3367 | * fill them until the writes are flushed. | |
3368 | */ | |
3369 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3370 | lru_cache_add_file(page); |
3371 | flush_dcache_page(page); | |
3372 | SetPageUptodate(page); | |
3373 | unlock_page(page); | |
3374 | page_cache_release(page); | |
c5fab6f4 JL |
3375 | rdata->pages[i] = NULL; |
3376 | rdata->nr_pages--; | |
8321fec4 | 3377 | continue; |
8d5ce4d2 JL |
3378 | } else { |
3379 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3380 | lru_cache_add_file(page); |
3381 | unlock_page(page); | |
3382 | page_cache_release(page); | |
c5fab6f4 JL |
3383 | rdata->pages[i] = NULL; |
3384 | rdata->nr_pages--; | |
8321fec4 | 3385 | continue; |
8d5ce4d2 | 3386 | } |
8321fec4 JL |
3387 | |
3388 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3389 | kunmap(page); | |
3390 | if (result < 0) | |
3391 | break; | |
3392 | ||
b3160aeb | 3393 | rdata->got_bytes += result; |
8d5ce4d2 JL |
3394 | } |
3395 | ||
b3160aeb PS |
3396 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
3397 | rdata->got_bytes : result; | |
8d5ce4d2 JL |
3398 | } |
3399 | ||
387eb92a PS |
3400 | static int |
3401 | readpages_get_pages(struct address_space *mapping, struct list_head *page_list, | |
3402 | unsigned int rsize, struct list_head *tmplist, | |
3403 | unsigned int *nr_pages, loff_t *offset, unsigned int *bytes) | |
3404 | { | |
3405 | struct page *page, *tpage; | |
3406 | unsigned int expected_index; | |
3407 | int rc; | |
3408 | ||
69cebd75 PS |
3409 | INIT_LIST_HEAD(tmplist); |
3410 | ||
387eb92a PS |
3411 | page = list_entry(page_list->prev, struct page, lru); |
3412 | ||
3413 | /* | |
3414 | * Lock the page and put it in the cache. Since no one else | |
3415 | * should have access to this page, we're safe to simply set | |
3416 | * PG_locked without checking it first. | |
3417 | */ | |
3418 | __set_page_locked(page); | |
3419 | rc = add_to_page_cache_locked(page, mapping, | |
3420 | page->index, GFP_KERNEL); | |
3421 | ||
3422 | /* give up if we can't stick it in the cache */ | |
3423 | if (rc) { | |
3424 | __clear_page_locked(page); | |
3425 | return rc; | |
3426 | } | |
3427 | ||
3428 | /* move first page to the tmplist */ | |
3429 | *offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3430 | *bytes = PAGE_CACHE_SIZE; | |
3431 | *nr_pages = 1; | |
3432 | list_move_tail(&page->lru, tmplist); | |
3433 | ||
3434 | /* now try and add more pages onto the request */ | |
3435 | expected_index = page->index + 1; | |
3436 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3437 | /* discontinuity ? */ | |
3438 | if (page->index != expected_index) | |
3439 | break; | |
3440 | ||
3441 | /* would this page push the read over the rsize? */ | |
3442 | if (*bytes + PAGE_CACHE_SIZE > rsize) | |
3443 | break; | |
3444 | ||
3445 | __set_page_locked(page); | |
3446 | if (add_to_page_cache_locked(page, mapping, page->index, | |
3447 | GFP_KERNEL)) { | |
3448 | __clear_page_locked(page); | |
3449 | break; | |
3450 | } | |
3451 | list_move_tail(&page->lru, tmplist); | |
3452 | (*bytes) += PAGE_CACHE_SIZE; | |
3453 | expected_index++; | |
3454 | (*nr_pages)++; | |
3455 | } | |
3456 | return rc; | |
8d5ce4d2 JL |
3457 | } |
3458 | ||
1da177e4 LT |
3459 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3460 | struct list_head *page_list, unsigned num_pages) | |
3461 | { | |
690c5e31 JL |
3462 | int rc; |
3463 | struct list_head tmplist; | |
3464 | struct cifsFileInfo *open_file = file->private_data; | |
3465 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
69cebd75 | 3466 | struct TCP_Server_Info *server; |
690c5e31 | 3467 | pid_t pid; |
1da177e4 | 3468 | |
56698236 SJ |
3469 | /* |
3470 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3471 | * immediately if the cookie is negative | |
54afa990 DH |
3472 | * |
3473 | * After this point, every page in the list might have PG_fscache set, | |
3474 | * so we will need to clean that up off of every page we don't use. | |
56698236 SJ |
3475 | */ |
3476 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3477 | &num_pages); | |
3478 | if (rc == 0) | |
690c5e31 | 3479 | return rc; |
56698236 | 3480 | |
d4ffff1f PS |
3481 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3482 | pid = open_file->pid; | |
3483 | else | |
3484 | pid = current->tgid; | |
3485 | ||
690c5e31 | 3486 | rc = 0; |
69cebd75 | 3487 | server = tlink_tcon(open_file->tlink)->ses->server; |
1da177e4 | 3488 | |
f96637be JP |
3489 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3490 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3491 | |
3492 | /* | |
3493 | * Start with the page at end of list and move it to private | |
3494 | * list. Do the same with any following pages until we hit | |
3495 | * the rsize limit, hit an index discontinuity, or run out of | |
3496 | * pages. Issue the async read and then start the loop again | |
3497 | * until the list is empty. | |
3498 | * | |
3499 | * Note that list order is important. The page_list is in | |
3500 | * the order of declining indexes. When we put the pages in | |
3501 | * the rdata->pages, then we want them in increasing order. | |
3502 | */ | |
3503 | while (!list_empty(page_list)) { | |
bed9da02 | 3504 | unsigned int i, nr_pages, bytes, rsize; |
690c5e31 JL |
3505 | loff_t offset; |
3506 | struct page *page, *tpage; | |
3507 | struct cifs_readdata *rdata; | |
bed9da02 | 3508 | unsigned credits; |
1da177e4 | 3509 | |
bed9da02 PS |
3510 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
3511 | &rsize, &credits); | |
3512 | if (rc) | |
3513 | break; | |
690c5e31 JL |
3514 | |
3515 | /* | |
69cebd75 PS |
3516 | * Give up immediately if rsize is too small to read an entire |
3517 | * page. The VFS will fall back to readpage. We should never | |
3518 | * reach this point however since we set ra_pages to 0 when the | |
3519 | * rsize is smaller than a cache page. | |
690c5e31 | 3520 | */ |
bed9da02 PS |
3521 | if (unlikely(rsize < PAGE_CACHE_SIZE)) { |
3522 | add_credits_and_wake_if(server, credits, 0); | |
69cebd75 | 3523 | return 0; |
bed9da02 | 3524 | } |
690c5e31 | 3525 | |
bed9da02 PS |
3526 | rc = readpages_get_pages(mapping, page_list, rsize, &tmplist, |
3527 | &nr_pages, &offset, &bytes); | |
690c5e31 | 3528 | if (rc) { |
bed9da02 | 3529 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3530 | break; |
3531 | } | |
3532 | ||
0471ca3f | 3533 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3534 | if (!rdata) { |
3535 | /* best to give up if we're out of mem */ | |
3536 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3537 | list_del(&page->lru); | |
3538 | lru_cache_add_file(page); | |
3539 | unlock_page(page); | |
3540 | page_cache_release(page); | |
3541 | } | |
3542 | rc = -ENOMEM; | |
bed9da02 | 3543 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3544 | break; |
3545 | } | |
3546 | ||
6993f74a | 3547 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3548 | rdata->mapping = mapping; |
3549 | rdata->offset = offset; | |
3550 | rdata->bytes = bytes; | |
3551 | rdata->pid = pid; | |
8321fec4 JL |
3552 | rdata->pagesz = PAGE_CACHE_SIZE; |
3553 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
bed9da02 | 3554 | rdata->credits = credits; |
c5fab6f4 JL |
3555 | |
3556 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3557 | list_del(&page->lru); | |
3558 | rdata->pages[rdata->nr_pages++] = page; | |
3559 | } | |
690c5e31 | 3560 | |
69cebd75 PS |
3561 | if (!rdata->cfile->invalidHandle || |
3562 | !cifs_reopen_file(rdata->cfile, true)) | |
3563 | rc = server->ops->async_readv(rdata); | |
3564 | if (rc) { | |
bed9da02 | 3565 | add_credits_and_wake_if(server, rdata->credits, 0); |
c5fab6f4 JL |
3566 | for (i = 0; i < rdata->nr_pages; i++) { |
3567 | page = rdata->pages[i]; | |
690c5e31 JL |
3568 | lru_cache_add_file(page); |
3569 | unlock_page(page); | |
3570 | page_cache_release(page); | |
69cebd75 PS |
3571 | if (rc == -EAGAIN) |
3572 | list_add_tail(&page->lru, &tmplist); | |
1da177e4 | 3573 | } |
6993f74a | 3574 | kref_put(&rdata->refcount, cifs_readdata_release); |
69cebd75 PS |
3575 | if (rc == -EAGAIN) { |
3576 | /* Re-add pages to the page_list and retry */ | |
3577 | list_splice(&tmplist, page_list); | |
3578 | continue; | |
3579 | } | |
1da177e4 LT |
3580 | break; |
3581 | } | |
6993f74a JL |
3582 | |
3583 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3584 | } |
3585 | ||
54afa990 DH |
3586 | /* Any pages that have been shown to fscache but didn't get added to |
3587 | * the pagecache must be uncached before they get returned to the | |
3588 | * allocator. | |
3589 | */ | |
3590 | cifs_fscache_readpages_cancel(mapping->host, page_list); | |
1da177e4 LT |
3591 | return rc; |
3592 | } | |
3593 | ||
a9e9b7bc SP |
3594 | /* |
3595 | * cifs_readpage_worker must be called with the page pinned | |
3596 | */ | |
1da177e4 LT |
3597 | static int cifs_readpage_worker(struct file *file, struct page *page, |
3598 | loff_t *poffset) | |
3599 | { | |
3600 | char *read_data; | |
3601 | int rc; | |
3602 | ||
56698236 | 3603 | /* Is the page cached? */ |
496ad9aa | 3604 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3605 | if (rc == 0) |
3606 | goto read_complete; | |
3607 | ||
1da177e4 LT |
3608 | read_data = kmap(page); |
3609 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3610 | |
1da177e4 | 3611 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3612 | |
1da177e4 LT |
3613 | if (rc < 0) |
3614 | goto io_error; | |
3615 | else | |
f96637be | 3616 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3617 | |
496ad9aa AV |
3618 | file_inode(file)->i_atime = |
3619 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3620 | |
1da177e4 LT |
3621 | if (PAGE_CACHE_SIZE > rc) |
3622 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3623 | ||
3624 | flush_dcache_page(page); | |
3625 | SetPageUptodate(page); | |
9dc06558 SJ |
3626 | |
3627 | /* send this page to the cache */ | |
496ad9aa | 3628 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3629 | |
1da177e4 | 3630 | rc = 0; |
fb8c4b14 | 3631 | |
1da177e4 | 3632 | io_error: |
fb8c4b14 | 3633 | kunmap(page); |
466bd31b | 3634 | unlock_page(page); |
56698236 SJ |
3635 | |
3636 | read_complete: | |
1da177e4 LT |
3637 | return rc; |
3638 | } | |
3639 | ||
3640 | static int cifs_readpage(struct file *file, struct page *page) | |
3641 | { | |
3642 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3643 | int rc = -EACCES; | |
6d5786a3 | 3644 | unsigned int xid; |
1da177e4 | 3645 | |
6d5786a3 | 3646 | xid = get_xid(); |
1da177e4 LT |
3647 | |
3648 | if (file->private_data == NULL) { | |
0f3bc09e | 3649 | rc = -EBADF; |
6d5786a3 | 3650 | free_xid(xid); |
0f3bc09e | 3651 | return rc; |
1da177e4 LT |
3652 | } |
3653 | ||
f96637be | 3654 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3655 | page, (int)offset, (int)offset); |
1da177e4 LT |
3656 | |
3657 | rc = cifs_readpage_worker(file, page, &offset); | |
3658 | ||
6d5786a3 | 3659 | free_xid(xid); |
1da177e4 LT |
3660 | return rc; |
3661 | } | |
3662 | ||
a403a0a3 SF |
3663 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3664 | { | |
3665 | struct cifsFileInfo *open_file; | |
3666 | ||
4477288a | 3667 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3668 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3669 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3670 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3671 | return 1; |
3672 | } | |
3673 | } | |
4477288a | 3674 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3675 | return 0; |
3676 | } | |
3677 | ||
1da177e4 LT |
3678 | /* We do not want to update the file size from server for inodes |
3679 | open for write - to avoid races with writepage extending | |
3680 | the file - in the future we could consider allowing | |
fb8c4b14 | 3681 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3682 | but this is tricky to do without racing with writebehind |
3683 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3684 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3685 | { |
a403a0a3 | 3686 | if (!cifsInode) |
4b18f2a9 | 3687 | return true; |
50c2f753 | 3688 | |
a403a0a3 SF |
3689 | if (is_inode_writable(cifsInode)) { |
3690 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3691 | struct cifs_sb_info *cifs_sb; |
3692 | ||
c32a0b68 | 3693 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3694 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3695 | /* since no page cache to corrupt on directio |
c32a0b68 | 3696 | we can change size safely */ |
4b18f2a9 | 3697 | return true; |
c32a0b68 SF |
3698 | } |
3699 | ||
fb8c4b14 | 3700 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3701 | return true; |
7ba52631 | 3702 | |
4b18f2a9 | 3703 | return false; |
23e7dd7d | 3704 | } else |
4b18f2a9 | 3705 | return true; |
1da177e4 LT |
3706 | } |
3707 | ||
d9414774 NP |
3708 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3709 | loff_t pos, unsigned len, unsigned flags, | |
3710 | struct page **pagep, void **fsdata) | |
1da177e4 | 3711 | { |
466bd31b | 3712 | int oncethru = 0; |
d9414774 NP |
3713 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3714 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3715 | loff_t page_start = pos & PAGE_MASK; |
3716 | loff_t i_size; | |
3717 | struct page *page; | |
3718 | int rc = 0; | |
d9414774 | 3719 | |
f96637be | 3720 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3721 | |
466bd31b | 3722 | start: |
54566b2c | 3723 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3724 | if (!page) { |
3725 | rc = -ENOMEM; | |
3726 | goto out; | |
3727 | } | |
8a236264 | 3728 | |
a98ee8c1 JL |
3729 | if (PageUptodate(page)) |
3730 | goto out; | |
8a236264 | 3731 | |
a98ee8c1 JL |
3732 | /* |
3733 | * If we write a full page it will be up to date, no need to read from | |
3734 | * the server. If the write is short, we'll end up doing a sync write | |
3735 | * instead. | |
3736 | */ | |
3737 | if (len == PAGE_CACHE_SIZE) | |
3738 | goto out; | |
8a236264 | 3739 | |
a98ee8c1 JL |
3740 | /* |
3741 | * optimize away the read when we have an oplock, and we're not | |
3742 | * expecting to use any of the data we'd be reading in. That | |
3743 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3744 | * and the write will cover all of the existing data. | |
3745 | */ | |
18cceb6a | 3746 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
a98ee8c1 JL |
3747 | i_size = i_size_read(mapping->host); |
3748 | if (page_start >= i_size || | |
3749 | (offset == 0 && (pos + len) >= i_size)) { | |
3750 | zero_user_segments(page, 0, offset, | |
3751 | offset + len, | |
3752 | PAGE_CACHE_SIZE); | |
3753 | /* | |
3754 | * PageChecked means that the parts of the page | |
3755 | * to which we're not writing are considered up | |
3756 | * to date. Once the data is copied to the | |
3757 | * page, it can be set uptodate. | |
3758 | */ | |
3759 | SetPageChecked(page); | |
3760 | goto out; | |
3761 | } | |
3762 | } | |
d9414774 | 3763 | |
466bd31b | 3764 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
a98ee8c1 JL |
3765 | /* |
3766 | * might as well read a page, it is fast enough. If we get | |
3767 | * an error, we don't need to return it. cifs_write_end will | |
3768 | * do a sync write instead since PG_uptodate isn't set. | |
3769 | */ | |
3770 | cifs_readpage_worker(file, page, &page_start); | |
466bd31b SP |
3771 | page_cache_release(page); |
3772 | oncethru = 1; | |
3773 | goto start; | |
8a236264 SF |
3774 | } else { |
3775 | /* we could try using another file handle if there is one - | |
3776 | but how would we lock it to prevent close of that handle | |
3777 | racing with this read? In any case | |
d9414774 | 3778 | this will be written out by write_end so is fine */ |
1da177e4 | 3779 | } |
a98ee8c1 JL |
3780 | out: |
3781 | *pagep = page; | |
3782 | return rc; | |
1da177e4 LT |
3783 | } |
3784 | ||
85f2d6b4 SJ |
3785 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3786 | { | |
3787 | if (PagePrivate(page)) | |
3788 | return 0; | |
3789 | ||
3790 | return cifs_fscache_release_page(page, gfp); | |
3791 | } | |
3792 | ||
d47992f8 LC |
3793 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
3794 | unsigned int length) | |
85f2d6b4 SJ |
3795 | { |
3796 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3797 | ||
d47992f8 | 3798 | if (offset == 0 && length == PAGE_CACHE_SIZE) |
85f2d6b4 SJ |
3799 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
3800 | } | |
3801 | ||
9ad1506b PS |
3802 | static int cifs_launder_page(struct page *page) |
3803 | { | |
3804 | int rc = 0; | |
3805 | loff_t range_start = page_offset(page); | |
3806 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3807 | struct writeback_control wbc = { | |
3808 | .sync_mode = WB_SYNC_ALL, | |
3809 | .nr_to_write = 0, | |
3810 | .range_start = range_start, | |
3811 | .range_end = range_end, | |
3812 | }; | |
3813 | ||
f96637be | 3814 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
3815 | |
3816 | if (clear_page_dirty_for_io(page)) | |
3817 | rc = cifs_writepage_locked(page, &wbc); | |
3818 | ||
3819 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3820 | return rc; | |
3821 | } | |
3822 | ||
9b646972 | 3823 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3824 | { |
3825 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3826 | oplock_break); | |
a5e18bc3 | 3827 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3828 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3829 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
c11f1df5 | 3830 | struct TCP_Server_Info *server = tcon->ses->server; |
eb4b756b | 3831 | int rc = 0; |
3bc303c2 | 3832 | |
c11f1df5 | 3833 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
74316201 | 3834 | TASK_UNINTERRUPTIBLE); |
c11f1df5 SP |
3835 | |
3836 | server->ops->downgrade_oplock(server, cinode, | |
3837 | test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags)); | |
3838 | ||
18cceb6a | 3839 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
63b7d3a4 | 3840 | cifs_has_mand_locks(cinode)) { |
f96637be JP |
3841 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
3842 | inode); | |
18cceb6a | 3843 | cinode->oplock = 0; |
63b7d3a4 PS |
3844 | } |
3845 | ||
3bc303c2 | 3846 | if (inode && S_ISREG(inode->i_mode)) { |
18cceb6a | 3847 | if (CIFS_CACHE_READ(cinode)) |
8737c930 | 3848 | break_lease(inode, O_RDONLY); |
d54ff732 | 3849 | else |
8737c930 | 3850 | break_lease(inode, O_WRONLY); |
3bc303c2 | 3851 | rc = filemap_fdatawrite(inode->i_mapping); |
18cceb6a | 3852 | if (!CIFS_CACHE_READ(cinode)) { |
eb4b756b JL |
3853 | rc = filemap_fdatawait(inode->i_mapping); |
3854 | mapping_set_error(inode->i_mapping, rc); | |
4f73c7d3 | 3855 | cifs_zap_mapping(inode); |
3bc303c2 | 3856 | } |
f96637be | 3857 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
3858 | } |
3859 | ||
85160e03 PS |
3860 | rc = cifs_push_locks(cfile); |
3861 | if (rc) | |
f96637be | 3862 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 3863 | |
3bc303c2 JL |
3864 | /* |
3865 | * releasing stale oplock after recent reconnect of smb session using | |
3866 | * a now incorrect file handle is not a data integrity issue but do | |
3867 | * not bother sending an oplock release if session to server still is | |
3868 | * disconnected since oplock already released by the server | |
3869 | */ | |
cdff08e7 | 3870 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3871 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3872 | cinode); | |
f96637be | 3873 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 3874 | } |
c11f1df5 | 3875 | cifs_done_oplock_break(cinode); |
3bc303c2 JL |
3876 | } |
3877 | ||
dca69288 SF |
3878 | /* |
3879 | * The presence of cifs_direct_io() in the address space ops vector | |
3880 | * allowes open() O_DIRECT flags which would have failed otherwise. | |
3881 | * | |
3882 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests | |
3883 | * so this method should never be called. | |
3884 | * | |
3885 | * Direct IO is not yet supported in the cached mode. | |
3886 | */ | |
3887 | static ssize_t | |
d8d3d94b AV |
3888 | cifs_direct_io(int rw, struct kiocb *iocb, struct iov_iter *iter, |
3889 | loff_t pos) | |
dca69288 SF |
3890 | { |
3891 | /* | |
3892 | * FIXME | |
3893 | * Eventually need to support direct IO for non forcedirectio mounts | |
3894 | */ | |
3895 | return -EINVAL; | |
3896 | } | |
3897 | ||
3898 | ||
f5e54d6e | 3899 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3900 | .readpage = cifs_readpage, |
3901 | .readpages = cifs_readpages, | |
3902 | .writepage = cifs_writepage, | |
37c0eb46 | 3903 | .writepages = cifs_writepages, |
d9414774 NP |
3904 | .write_begin = cifs_write_begin, |
3905 | .write_end = cifs_write_end, | |
1da177e4 | 3906 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 | 3907 | .releasepage = cifs_release_page, |
dca69288 | 3908 | .direct_IO = cifs_direct_io, |
85f2d6b4 | 3909 | .invalidatepage = cifs_invalidate_page, |
9ad1506b | 3910 | .launder_page = cifs_launder_page, |
1da177e4 | 3911 | }; |
273d81d6 DK |
3912 | |
3913 | /* | |
3914 | * cifs_readpages requires the server to support a buffer large enough to | |
3915 | * contain the header plus one complete page of data. Otherwise, we need | |
3916 | * to leave cifs_readpages out of the address space operations. | |
3917 | */ | |
f5e54d6e | 3918 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3919 | .readpage = cifs_readpage, |
3920 | .writepage = cifs_writepage, | |
3921 | .writepages = cifs_writepages, | |
d9414774 NP |
3922 | .write_begin = cifs_write_begin, |
3923 | .write_end = cifs_write_end, | |
273d81d6 | 3924 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3925 | .releasepage = cifs_release_page, |
3926 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3927 | .launder_page = cifs_launder_page, |
273d81d6 | 3928 | }; |