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, | |
bc8ebdc4 | 143 | cifs_remap(cifs_sb)); |
608712fe JL |
144 | cifs_put_tlink(tlink); |
145 | ||
146 | if (rc) | |
147 | goto posix_open_ret; | |
148 | ||
149 | if (presp_data->Type == cpu_to_le32(-1)) | |
150 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
151 | ||
152 | if (!pinode) | |
153 | goto posix_open_ret; /* caller does not need info */ | |
154 | ||
155 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
156 | ||
157 | /* get new inode and set it up */ | |
158 | if (*pinode == NULL) { | |
159 | cifs_fill_uniqueid(sb, &fattr); | |
160 | *pinode = cifs_iget(sb, &fattr); | |
161 | if (!*pinode) { | |
162 | rc = -ENOMEM; | |
163 | goto posix_open_ret; | |
164 | } | |
165 | } else { | |
166 | cifs_fattr_to_inode(*pinode, &fattr); | |
167 | } | |
168 | ||
169 | posix_open_ret: | |
170 | kfree(presp_data); | |
171 | return rc; | |
172 | } | |
173 | ||
eeb910a6 PS |
174 | static int |
175 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
176 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
177 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
178 | { |
179 | int rc; | |
fb1214e4 | 180 | int desired_access; |
eeb910a6 | 181 | int disposition; |
3d3ea8e6 | 182 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 183 | FILE_ALL_INFO *buf; |
b8c32dbb | 184 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 185 | struct cifs_open_parms oparms; |
eeb910a6 | 186 | |
b8c32dbb | 187 | if (!server->ops->open) |
fb1214e4 PS |
188 | return -ENOSYS; |
189 | ||
190 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
191 | |
192 | /********************************************************************* | |
193 | * open flag mapping table: | |
194 | * | |
195 | * POSIX Flag CIFS Disposition | |
196 | * ---------- ---------------- | |
197 | * O_CREAT FILE_OPEN_IF | |
198 | * O_CREAT | O_EXCL FILE_CREATE | |
199 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
200 | * O_TRUNC FILE_OVERWRITE | |
201 | * none of the above FILE_OPEN | |
202 | * | |
203 | * Note that there is not a direct match between disposition | |
204 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
205 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
206 | * file rather than creating a new file as FILE_SUPERSEDE does | |
207 | * (which uses the attributes / metadata passed in on open call) | |
208 | *? | |
209 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
210 | *? and the read write flags match reasonably. O_LARGEFILE | |
211 | *? is irrelevant because largefile support is always used | |
212 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
213 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
214 | *********************************************************************/ | |
215 | ||
216 | disposition = cifs_get_disposition(f_flags); | |
217 | ||
218 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
219 | ||
220 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
221 | if (!buf) | |
222 | return -ENOMEM; | |
223 | ||
3d3ea8e6 SP |
224 | if (backup_cred(cifs_sb)) |
225 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
226 | ||
226730b4 PS |
227 | oparms.tcon = tcon; |
228 | oparms.cifs_sb = cifs_sb; | |
229 | oparms.desired_access = desired_access; | |
230 | oparms.create_options = create_options; | |
231 | oparms.disposition = disposition; | |
232 | oparms.path = full_path; | |
233 | oparms.fid = fid; | |
9cbc0b73 | 234 | oparms.reconnect = false; |
226730b4 PS |
235 | |
236 | rc = server->ops->open(xid, &oparms, oplock, buf); | |
eeb910a6 PS |
237 | |
238 | if (rc) | |
239 | goto out; | |
240 | ||
241 | if (tcon->unix_ext) | |
242 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
243 | xid); | |
244 | else | |
245 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
42eacf9e | 246 | xid, fid); |
eeb910a6 PS |
247 | |
248 | out: | |
249 | kfree(buf); | |
250 | return rc; | |
251 | } | |
252 | ||
63b7d3a4 PS |
253 | static bool |
254 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
255 | { | |
256 | struct cifs_fid_locks *cur; | |
257 | bool has_locks = false; | |
258 | ||
259 | down_read(&cinode->lock_sem); | |
260 | list_for_each_entry(cur, &cinode->llist, llist) { | |
261 | if (!list_empty(&cur->locks)) { | |
262 | has_locks = true; | |
263 | break; | |
264 | } | |
265 | } | |
266 | up_read(&cinode->lock_sem); | |
267 | return has_locks; | |
268 | } | |
269 | ||
15ecb436 | 270 | struct cifsFileInfo * |
fb1214e4 | 271 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
272 | struct tcon_link *tlink, __u32 oplock) |
273 | { | |
1f1735cb | 274 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 275 | struct inode *inode = d_inode(dentry); |
4b4de76e PS |
276 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
277 | struct cifsFileInfo *cfile; | |
f45d3416 | 278 | struct cifs_fid_locks *fdlocks; |
233839b1 | 279 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 280 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
281 | |
282 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
283 | if (cfile == NULL) | |
284 | return cfile; | |
285 | ||
f45d3416 PS |
286 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
287 | if (!fdlocks) { | |
288 | kfree(cfile); | |
289 | return NULL; | |
290 | } | |
291 | ||
292 | INIT_LIST_HEAD(&fdlocks->locks); | |
293 | fdlocks->cfile = cfile; | |
294 | cfile->llist = fdlocks; | |
1b4b55a1 | 295 | down_write(&cinode->lock_sem); |
f45d3416 | 296 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 297 | up_write(&cinode->lock_sem); |
f45d3416 | 298 | |
4b4de76e | 299 | cfile->count = 1; |
4b4de76e PS |
300 | cfile->pid = current->tgid; |
301 | cfile->uid = current_fsuid(); | |
302 | cfile->dentry = dget(dentry); | |
303 | cfile->f_flags = file->f_flags; | |
304 | cfile->invalidHandle = false; | |
305 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 306 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 307 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 308 | |
24261fc2 MG |
309 | cifs_sb_active(inode->i_sb); |
310 | ||
63b7d3a4 PS |
311 | /* |
312 | * If the server returned a read oplock and we have mandatory brlocks, | |
313 | * set oplock level to None. | |
314 | */ | |
53ef1016 | 315 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
f96637be | 316 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
317 | oplock = 0; |
318 | } | |
319 | ||
4477288a | 320 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 321 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
322 | oplock = fid->pending_open->oplock; |
323 | list_del(&fid->pending_open->olist); | |
324 | ||
42873b0a | 325 | fid->purge_cache = false; |
63b7d3a4 | 326 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
327 | |
328 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
329 | /* if readable file instance put first in list*/ |
330 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 331 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 332 | else |
4b4de76e | 333 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 334 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 335 | |
42873b0a | 336 | if (fid->purge_cache) |
4f73c7d3 | 337 | cifs_zap_mapping(inode); |
42873b0a | 338 | |
4b4de76e PS |
339 | file->private_data = cfile; |
340 | return cfile; | |
15ecb436 JL |
341 | } |
342 | ||
764a1b1a JL |
343 | struct cifsFileInfo * |
344 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
345 | { | |
346 | spin_lock(&cifs_file_list_lock); | |
347 | cifsFileInfo_get_locked(cifs_file); | |
348 | spin_unlock(&cifs_file_list_lock); | |
349 | return cifs_file; | |
350 | } | |
351 | ||
cdff08e7 SF |
352 | /* |
353 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
354 | * the filehandle out on the server. Must be called without holding |
355 | * cifs_file_list_lock. | |
cdff08e7 | 356 | */ |
b33879aa JL |
357 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
358 | { | |
2b0143b5 | 359 | struct inode *inode = d_inode(cifs_file->dentry); |
96daf2b0 | 360 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 361 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 362 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
363 | struct super_block *sb = inode->i_sb; |
364 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 365 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
366 | struct cifs_fid fid; |
367 | struct cifs_pending_open open; | |
ca7df8e0 | 368 | bool oplock_break_cancelled; |
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 | 387 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
2b0143b5 | 388 | d_inode(cifs_file->dentry)); |
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 | ||
ca7df8e0 | 400 | oplock_break_cancelled = cancel_work_sync(&cifs_file->oplock_break); |
ad635942 | 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 | ||
ca7df8e0 SP |
412 | if (oplock_break_cancelled) |
413 | cifs_done_oplock_break(cifsi); | |
414 | ||
233839b1 PS |
415 | cifs_del_pending_open(&open); |
416 | ||
f45d3416 PS |
417 | /* |
418 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
419 | * is closed anyway. |
420 | */ | |
1b4b55a1 | 421 | down_write(&cifsi->lock_sem); |
f45d3416 | 422 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 423 | list_del(&li->llist); |
85160e03 | 424 | cifs_del_lock_waiters(li); |
cdff08e7 | 425 | kfree(li); |
b33879aa | 426 | } |
f45d3416 PS |
427 | list_del(&cifs_file->llist->llist); |
428 | kfree(cifs_file->llist); | |
1b4b55a1 | 429 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
430 | |
431 | cifs_put_tlink(cifs_file->tlink); | |
432 | dput(cifs_file->dentry); | |
24261fc2 | 433 | cifs_sb_deactive(sb); |
cdff08e7 | 434 | kfree(cifs_file); |
b33879aa JL |
435 | } |
436 | ||
1da177e4 | 437 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 438 | |
1da177e4 LT |
439 | { |
440 | int rc = -EACCES; | |
6d5786a3 | 441 | unsigned int xid; |
590a3fe0 | 442 | __u32 oplock; |
1da177e4 | 443 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 444 | struct TCP_Server_Info *server; |
96daf2b0 | 445 | struct cifs_tcon *tcon; |
7ffec372 | 446 | struct tcon_link *tlink; |
fb1214e4 | 447 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 448 | char *full_path = NULL; |
7e12eddb | 449 | bool posix_open_ok = false; |
fb1214e4 | 450 | struct cifs_fid fid; |
233839b1 | 451 | struct cifs_pending_open open; |
1da177e4 | 452 | |
6d5786a3 | 453 | xid = get_xid(); |
1da177e4 LT |
454 | |
455 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
456 | tlink = cifs_sb_tlink(cifs_sb); |
457 | if (IS_ERR(tlink)) { | |
6d5786a3 | 458 | free_xid(xid); |
7ffec372 JL |
459 | return PTR_ERR(tlink); |
460 | } | |
461 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 462 | server = tcon->ses->server; |
1da177e4 | 463 | |
1f1735cb | 464 | full_path = build_path_from_dentry(file_dentry(file)); |
1da177e4 | 465 | if (full_path == NULL) { |
0f3bc09e | 466 | rc = -ENOMEM; |
232341ba | 467 | goto out; |
1da177e4 LT |
468 | } |
469 | ||
f96637be | 470 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 471 | inode, file->f_flags, full_path); |
276a74a4 | 472 | |
787aded6 NJ |
473 | if (file->f_flags & O_DIRECT && |
474 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { | |
475 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
476 | file->f_op = &cifs_file_direct_nobrl_ops; | |
477 | else | |
478 | file->f_op = &cifs_file_direct_ops; | |
479 | } | |
480 | ||
233839b1 | 481 | if (server->oplocks) |
276a74a4 SF |
482 | oplock = REQ_OPLOCK; |
483 | else | |
484 | oplock = 0; | |
485 | ||
64cc2c63 | 486 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
487 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
488 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 489 | /* can not refresh inode info since size could be stale */ |
2422f676 | 490 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 491 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 492 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 493 | if (rc == 0) { |
f96637be | 494 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 495 | posix_open_ok = true; |
64cc2c63 SF |
496 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
497 | if (tcon->ses->serverNOS) | |
f96637be JP |
498 | 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", |
499 | tcon->ses->serverName, | |
500 | tcon->ses->serverNOS); | |
64cc2c63 | 501 | tcon->broken_posix_open = true; |
276a74a4 SF |
502 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
503 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
504 | goto out; | |
fb1214e4 PS |
505 | /* |
506 | * Else fallthrough to retry open the old way on network i/o | |
507 | * or DFS errors. | |
508 | */ | |
276a74a4 SF |
509 | } |
510 | ||
233839b1 PS |
511 | if (server->ops->get_lease_key) |
512 | server->ops->get_lease_key(inode, &fid); | |
513 | ||
514 | cifs_add_pending_open(&fid, tlink, &open); | |
515 | ||
7e12eddb | 516 | if (!posix_open_ok) { |
b8c32dbb PS |
517 | if (server->ops->get_lease_key) |
518 | server->ops->get_lease_key(inode, &fid); | |
519 | ||
7e12eddb | 520 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 521 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
522 | if (rc) { |
523 | cifs_del_pending_open(&open); | |
7e12eddb | 524 | goto out; |
233839b1 | 525 | } |
7e12eddb | 526 | } |
47c78b7f | 527 | |
fb1214e4 PS |
528 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
529 | if (cfile == NULL) { | |
b8c32dbb PS |
530 | if (server->ops->close) |
531 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 532 | cifs_del_pending_open(&open); |
1da177e4 LT |
533 | rc = -ENOMEM; |
534 | goto out; | |
535 | } | |
1da177e4 | 536 | |
9451a9a5 SJ |
537 | cifs_fscache_set_inode_cookie(inode, file); |
538 | ||
7e12eddb | 539 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
540 | /* |
541 | * Time to set mode which we can not set earlier due to | |
542 | * problems creating new read-only files. | |
543 | */ | |
7e12eddb PS |
544 | struct cifs_unix_set_info_args args = { |
545 | .mode = inode->i_mode, | |
49418b2c EB |
546 | .uid = INVALID_UID, /* no change */ |
547 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
548 | .ctime = NO_CHANGE_64, |
549 | .atime = NO_CHANGE_64, | |
550 | .mtime = NO_CHANGE_64, | |
551 | .device = 0, | |
552 | }; | |
fb1214e4 PS |
553 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
554 | cfile->pid); | |
1da177e4 LT |
555 | } |
556 | ||
557 | out: | |
1da177e4 | 558 | kfree(full_path); |
6d5786a3 | 559 | free_xid(xid); |
7ffec372 | 560 | cifs_put_tlink(tlink); |
1da177e4 LT |
561 | return rc; |
562 | } | |
563 | ||
f152fd5f PS |
564 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
565 | ||
2ae78ba8 PS |
566 | /* |
567 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 568 | * to server was lost. |
2ae78ba8 | 569 | */ |
f152fd5f PS |
570 | static int |
571 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 572 | { |
f152fd5f | 573 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
2b0143b5 | 574 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
f152fd5f | 575 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1da177e4 LT |
576 | int rc = 0; |
577 | ||
689c3db4 | 578 | down_read(&cinode->lock_sem); |
f152fd5f | 579 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
580 | /* can cache locks - no need to relock */ |
581 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
582 | return rc; |
583 | } | |
584 | ||
585 | if (cap_unix(tcon->ses) && | |
586 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
587 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
588 | rc = cifs_push_posix_locks(cfile); | |
589 | else | |
590 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 591 | |
689c3db4 | 592 | up_read(&cinode->lock_sem); |
1da177e4 LT |
593 | return rc; |
594 | } | |
595 | ||
2ae78ba8 PS |
596 | static int |
597 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
598 | { |
599 | int rc = -EACCES; | |
6d5786a3 | 600 | unsigned int xid; |
590a3fe0 | 601 | __u32 oplock; |
1da177e4 | 602 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 603 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
604 | struct TCP_Server_Info *server; |
605 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 606 | struct inode *inode; |
1da177e4 | 607 | char *full_path = NULL; |
2ae78ba8 | 608 | int desired_access; |
1da177e4 | 609 | int disposition = FILE_OPEN; |
3d3ea8e6 | 610 | int create_options = CREATE_NOT_DIR; |
226730b4 | 611 | struct cifs_open_parms oparms; |
1da177e4 | 612 | |
6d5786a3 | 613 | xid = get_xid(); |
2ae78ba8 PS |
614 | mutex_lock(&cfile->fh_mutex); |
615 | if (!cfile->invalidHandle) { | |
616 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 617 | rc = 0; |
6d5786a3 | 618 | free_xid(xid); |
0f3bc09e | 619 | return rc; |
1da177e4 LT |
620 | } |
621 | ||
2b0143b5 | 622 | inode = d_inode(cfile->dentry); |
1da177e4 | 623 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
624 | tcon = tlink_tcon(cfile->tlink); |
625 | server = tcon->ses->server; | |
626 | ||
627 | /* | |
628 | * Can not grab rename sem here because various ops, including those | |
629 | * that already have the rename sem can end up causing writepage to get | |
630 | * called and if the server was down that means we end up here, and we | |
631 | * can never tell if the caller already has the rename_sem. | |
632 | */ | |
633 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 634 | if (full_path == NULL) { |
3a9f462f | 635 | rc = -ENOMEM; |
2ae78ba8 | 636 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 637 | free_xid(xid); |
3a9f462f | 638 | return rc; |
1da177e4 LT |
639 | } |
640 | ||
f96637be JP |
641 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
642 | inode, cfile->f_flags, full_path); | |
1da177e4 | 643 | |
10b9b98e | 644 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
645 | oplock = REQ_OPLOCK; |
646 | else | |
4b18f2a9 | 647 | oplock = 0; |
1da177e4 | 648 | |
29e20f9c | 649 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 650 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 651 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
652 | /* |
653 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
654 | * original open. Must mask them off for a reopen. | |
655 | */ | |
2ae78ba8 | 656 | unsigned int oflags = cfile->f_flags & |
15886177 | 657 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 658 | |
2422f676 | 659 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 | 660 | cifs_sb->mnt_file_mode /* ignored */, |
9cbc0b73 | 661 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 662 | if (rc == 0) { |
f96637be | 663 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 664 | oparms.reconnect = true; |
7fc8f4e9 SF |
665 | goto reopen_success; |
666 | } | |
2ae78ba8 PS |
667 | /* |
668 | * fallthrough to retry open the old way on errors, especially | |
669 | * in the reconnect path it is important to retry hard | |
670 | */ | |
7fc8f4e9 SF |
671 | } |
672 | ||
2ae78ba8 | 673 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 674 | |
3d3ea8e6 SP |
675 | if (backup_cred(cifs_sb)) |
676 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
677 | ||
b8c32dbb | 678 | if (server->ops->get_lease_key) |
9cbc0b73 | 679 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 680 | |
226730b4 PS |
681 | oparms.tcon = tcon; |
682 | oparms.cifs_sb = cifs_sb; | |
683 | oparms.desired_access = desired_access; | |
684 | oparms.create_options = create_options; | |
685 | oparms.disposition = disposition; | |
686 | oparms.path = full_path; | |
9cbc0b73 PS |
687 | oparms.fid = &cfile->fid; |
688 | oparms.reconnect = true; | |
226730b4 | 689 | |
2ae78ba8 PS |
690 | /* |
691 | * Can not refresh inode by passing in file_info buf to be returned by | |
d81b8a40 | 692 | * ops->open and then calling get_inode_info with returned buf since |
2ae78ba8 PS |
693 | * file might have write behind data that needs to be flushed and server |
694 | * version of file size can be stale. If we knew for sure that inode was | |
695 | * not dirty locally we could do this. | |
696 | */ | |
226730b4 | 697 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
698 | if (rc == -ENOENT && oparms.reconnect == false) { |
699 | /* durable handle timeout is expired - open the file again */ | |
700 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
701 | /* indicate that we need to relock the file */ | |
702 | oparms.reconnect = true; | |
703 | } | |
704 | ||
1da177e4 | 705 | if (rc) { |
2ae78ba8 | 706 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
707 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
708 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
709 | goto reopen_error_exit; |
710 | } | |
711 | ||
7fc8f4e9 | 712 | reopen_success: |
2ae78ba8 PS |
713 | cfile->invalidHandle = false; |
714 | mutex_unlock(&cfile->fh_mutex); | |
715 | cinode = CIFS_I(inode); | |
15886177 JL |
716 | |
717 | if (can_flush) { | |
718 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 719 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 720 | |
15886177 | 721 | if (tcon->unix_ext) |
2ae78ba8 PS |
722 | rc = cifs_get_inode_info_unix(&inode, full_path, |
723 | inode->i_sb, xid); | |
15886177 | 724 | else |
2ae78ba8 PS |
725 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
726 | inode->i_sb, xid, NULL); | |
727 | } | |
728 | /* | |
729 | * Else we are writing out data to server already and could deadlock if | |
730 | * we tried to flush data, and since we do not know if we have data that | |
731 | * would invalidate the current end of file on the server we can not go | |
732 | * to the server to get the new inode info. | |
733 | */ | |
734 | ||
9cbc0b73 PS |
735 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
736 | if (oparms.reconnect) | |
737 | cifs_relock_file(cfile); | |
15886177 JL |
738 | |
739 | reopen_error_exit: | |
1da177e4 | 740 | kfree(full_path); |
6d5786a3 | 741 | free_xid(xid); |
1da177e4 LT |
742 | return rc; |
743 | } | |
744 | ||
745 | int cifs_close(struct inode *inode, struct file *file) | |
746 | { | |
77970693 JL |
747 | if (file->private_data != NULL) { |
748 | cifsFileInfo_put(file->private_data); | |
749 | file->private_data = NULL; | |
750 | } | |
7ee1af76 | 751 | |
cdff08e7 SF |
752 | /* return code from the ->release op is always ignored */ |
753 | return 0; | |
1da177e4 LT |
754 | } |
755 | ||
756 | int cifs_closedir(struct inode *inode, struct file *file) | |
757 | { | |
758 | int rc = 0; | |
6d5786a3 | 759 | unsigned int xid; |
4b4de76e | 760 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
761 | struct cifs_tcon *tcon; |
762 | struct TCP_Server_Info *server; | |
763 | char *buf; | |
1da177e4 | 764 | |
f96637be | 765 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 766 | |
92fc65a7 PS |
767 | if (cfile == NULL) |
768 | return rc; | |
769 | ||
6d5786a3 | 770 | xid = get_xid(); |
92fc65a7 PS |
771 | tcon = tlink_tcon(cfile->tlink); |
772 | server = tcon->ses->server; | |
1da177e4 | 773 | |
f96637be | 774 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
92fc65a7 | 775 | spin_lock(&cifs_file_list_lock); |
52755808 | 776 | if (server->ops->dir_needs_close(cfile)) { |
92fc65a7 PS |
777 | cfile->invalidHandle = true; |
778 | spin_unlock(&cifs_file_list_lock); | |
779 | if (server->ops->close_dir) | |
780 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
781 | else | |
782 | rc = -ENOSYS; | |
f96637be | 783 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
784 | /* not much we can do if it fails anyway, ignore rc */ |
785 | rc = 0; | |
786 | } else | |
787 | spin_unlock(&cifs_file_list_lock); | |
788 | ||
789 | buf = cfile->srch_inf.ntwrk_buf_start; | |
790 | if (buf) { | |
f96637be | 791 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
792 | cfile->srch_inf.ntwrk_buf_start = NULL; |
793 | if (cfile->srch_inf.smallBuf) | |
794 | cifs_small_buf_release(buf); | |
795 | else | |
796 | cifs_buf_release(buf); | |
1da177e4 | 797 | } |
92fc65a7 PS |
798 | |
799 | cifs_put_tlink(cfile->tlink); | |
800 | kfree(file->private_data); | |
801 | file->private_data = NULL; | |
1da177e4 | 802 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 803 | free_xid(xid); |
1da177e4 LT |
804 | return rc; |
805 | } | |
806 | ||
85160e03 | 807 | static struct cifsLockInfo * |
fbd35aca | 808 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 809 | { |
a88b4707 | 810 | struct cifsLockInfo *lock = |
fb8c4b14 | 811 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
812 | if (!lock) |
813 | return lock; | |
814 | lock->offset = offset; | |
815 | lock->length = length; | |
816 | lock->type = type; | |
a88b4707 PS |
817 | lock->pid = current->tgid; |
818 | INIT_LIST_HEAD(&lock->blist); | |
819 | init_waitqueue_head(&lock->block_q); | |
820 | return lock; | |
85160e03 PS |
821 | } |
822 | ||
f7ba7fe6 | 823 | void |
85160e03 PS |
824 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
825 | { | |
826 | struct cifsLockInfo *li, *tmp; | |
827 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
828 | list_del_init(&li->blist); | |
829 | wake_up(&li->block_q); | |
830 | } | |
831 | } | |
832 | ||
081c0414 PS |
833 | #define CIFS_LOCK_OP 0 |
834 | #define CIFS_READ_OP 1 | |
835 | #define CIFS_WRITE_OP 2 | |
836 | ||
837 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 838 | static bool |
f45d3416 PS |
839 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
840 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 841 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 842 | { |
fbd35aca | 843 | struct cifsLockInfo *li; |
f45d3416 | 844 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 845 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 846 | |
f45d3416 | 847 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
848 | if (offset + length <= li->offset || |
849 | offset >= li->offset + li->length) | |
850 | continue; | |
081c0414 PS |
851 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
852 | server->ops->compare_fids(cfile, cur_cfile)) { | |
853 | /* shared lock prevents write op through the same fid */ | |
854 | if (!(li->type & server->vals->shared_lock_type) || | |
855 | rw_check != CIFS_WRITE_OP) | |
856 | continue; | |
857 | } | |
f45d3416 PS |
858 | if ((type & server->vals->shared_lock_type) && |
859 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
860 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 861 | continue; |
579f9053 PS |
862 | if (conf_lock) |
863 | *conf_lock = li; | |
f45d3416 | 864 | return true; |
85160e03 PS |
865 | } |
866 | return false; | |
867 | } | |
868 | ||
579f9053 | 869 | bool |
55157dfb | 870 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 871 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 872 | int rw_check) |
161ebf9f | 873 | { |
fbd35aca | 874 | bool rc = false; |
f45d3416 | 875 | struct cifs_fid_locks *cur; |
2b0143b5 | 876 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
fbd35aca | 877 | |
f45d3416 PS |
878 | list_for_each_entry(cur, &cinode->llist, llist) { |
879 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 880 | cfile, conf_lock, rw_check); |
fbd35aca PS |
881 | if (rc) |
882 | break; | |
883 | } | |
fbd35aca PS |
884 | |
885 | return rc; | |
161ebf9f PS |
886 | } |
887 | ||
9a5101c8 PS |
888 | /* |
889 | * Check if there is another lock that prevents us to set the lock (mandatory | |
890 | * style). If such a lock exists, update the flock structure with its | |
891 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
892 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
893 | * the server or 1 otherwise. | |
894 | */ | |
85160e03 | 895 | static int |
fbd35aca PS |
896 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
897 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
898 | { |
899 | int rc = 0; | |
900 | struct cifsLockInfo *conf_lock; | |
2b0143b5 | 901 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
106dc538 | 902 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
903 | bool exist; |
904 | ||
1b4b55a1 | 905 | down_read(&cinode->lock_sem); |
85160e03 | 906 | |
55157dfb | 907 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 908 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
909 | if (exist) { |
910 | flock->fl_start = conf_lock->offset; | |
911 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
912 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 913 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
914 | flock->fl_type = F_RDLCK; |
915 | else | |
916 | flock->fl_type = F_WRLCK; | |
917 | } else if (!cinode->can_cache_brlcks) | |
918 | rc = 1; | |
919 | else | |
920 | flock->fl_type = F_UNLCK; | |
921 | ||
1b4b55a1 | 922 | up_read(&cinode->lock_sem); |
85160e03 PS |
923 | return rc; |
924 | } | |
925 | ||
161ebf9f | 926 | static void |
fbd35aca | 927 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 928 | { |
2b0143b5 | 929 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
1b4b55a1 | 930 | down_write(&cinode->lock_sem); |
f45d3416 | 931 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 932 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
933 | } |
934 | ||
9a5101c8 PS |
935 | /* |
936 | * Set the byte-range lock (mandatory style). Returns: | |
937 | * 1) 0, if we set the lock and don't need to request to the server; | |
938 | * 2) 1, if no locks prevent us but we need to request to the server; | |
939 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
940 | */ | |
85160e03 | 941 | static int |
fbd35aca | 942 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 943 | bool wait) |
85160e03 | 944 | { |
161ebf9f | 945 | struct cifsLockInfo *conf_lock; |
2b0143b5 | 946 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
85160e03 PS |
947 | bool exist; |
948 | int rc = 0; | |
949 | ||
85160e03 PS |
950 | try_again: |
951 | exist = false; | |
1b4b55a1 | 952 | down_write(&cinode->lock_sem); |
85160e03 | 953 | |
55157dfb | 954 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 955 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 956 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 957 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 958 | up_write(&cinode->lock_sem); |
85160e03 PS |
959 | return rc; |
960 | } | |
961 | ||
962 | if (!exist) | |
963 | rc = 1; | |
964 | else if (!wait) | |
965 | rc = -EACCES; | |
966 | else { | |
967 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 968 | up_write(&cinode->lock_sem); |
85160e03 PS |
969 | rc = wait_event_interruptible(lock->block_q, |
970 | (lock->blist.prev == &lock->blist) && | |
971 | (lock->blist.next == &lock->blist)); | |
972 | if (!rc) | |
973 | goto try_again; | |
1b4b55a1 | 974 | down_write(&cinode->lock_sem); |
a88b4707 | 975 | list_del_init(&lock->blist); |
85160e03 PS |
976 | } |
977 | ||
1b4b55a1 | 978 | up_write(&cinode->lock_sem); |
85160e03 PS |
979 | return rc; |
980 | } | |
981 | ||
9a5101c8 PS |
982 | /* |
983 | * Check if there is another lock that prevents us to set the lock (posix | |
984 | * style). If such a lock exists, update the flock structure with its | |
985 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
986 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
987 | * the server or 1 otherwise. | |
988 | */ | |
85160e03 | 989 | static int |
4f6bcec9 PS |
990 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
991 | { | |
992 | int rc = 0; | |
496ad9aa | 993 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
994 | unsigned char saved_type = flock->fl_type; |
995 | ||
50792760 PS |
996 | if ((flock->fl_flags & FL_POSIX) == 0) |
997 | return 1; | |
998 | ||
1b4b55a1 | 999 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
1000 | posix_test_lock(file, flock); |
1001 | ||
1002 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
1003 | flock->fl_type = saved_type; | |
1004 | rc = 1; | |
1005 | } | |
1006 | ||
1b4b55a1 | 1007 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
1008 | return rc; |
1009 | } | |
1010 | ||
9a5101c8 PS |
1011 | /* |
1012 | * Set the byte-range lock (posix style). Returns: | |
1013 | * 1) 0, if we set the lock and don't need to request to the server; | |
1014 | * 2) 1, if we need to request to the server; | |
1015 | * 3) <0, if the error occurs while setting the lock. | |
1016 | */ | |
4f6bcec9 PS |
1017 | static int |
1018 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1019 | { | |
496ad9aa | 1020 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
1021 | int rc = 1; |
1022 | ||
1023 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1024 | return rc; | |
4f6bcec9 | 1025 | |
66189be7 | 1026 | try_again: |
1b4b55a1 | 1027 | down_write(&cinode->lock_sem); |
4f6bcec9 | 1028 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1029 | up_write(&cinode->lock_sem); |
50792760 | 1030 | return rc; |
4f6bcec9 | 1031 | } |
66189be7 PS |
1032 | |
1033 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1034 | up_write(&cinode->lock_sem); |
66189be7 PS |
1035 | if (rc == FILE_LOCK_DEFERRED) { |
1036 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1037 | if (!rc) | |
1038 | goto try_again; | |
1a9e64a7 | 1039 | posix_unblock_lock(flock); |
66189be7 | 1040 | } |
9ebb389d | 1041 | return rc; |
4f6bcec9 PS |
1042 | } |
1043 | ||
d39a4f71 | 1044 | int |
4f6bcec9 | 1045 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1046 | { |
6d5786a3 PS |
1047 | unsigned int xid; |
1048 | int rc = 0, stored_rc; | |
85160e03 PS |
1049 | struct cifsLockInfo *li, *tmp; |
1050 | struct cifs_tcon *tcon; | |
0013fb4c | 1051 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1052 | LOCKING_ANDX_RANGE *buf, *cur; |
1053 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1054 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1055 | int i; | |
85160e03 | 1056 | |
6d5786a3 | 1057 | xid = get_xid(); |
85160e03 PS |
1058 | tcon = tlink_tcon(cfile->tlink); |
1059 | ||
0013fb4c PS |
1060 | /* |
1061 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1062 | * and check it for zero before using. | |
1063 | */ | |
1064 | max_buf = tcon->ses->server->maxBuf; | |
1065 | if (!max_buf) { | |
6d5786a3 | 1066 | free_xid(xid); |
0013fb4c PS |
1067 | return -EINVAL; |
1068 | } | |
1069 | ||
1070 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1071 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1072 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
32b9aaf1 | 1073 | if (!buf) { |
6d5786a3 | 1074 | free_xid(xid); |
e2f2886a | 1075 | return -ENOMEM; |
32b9aaf1 PS |
1076 | } |
1077 | ||
1078 | for (i = 0; i < 2; i++) { | |
1079 | cur = buf; | |
1080 | num = 0; | |
f45d3416 | 1081 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1082 | if (li->type != types[i]) |
1083 | continue; | |
1084 | cur->Pid = cpu_to_le16(li->pid); | |
1085 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1086 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1087 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1088 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1089 | if (++num == max_num) { | |
4b4de76e PS |
1090 | stored_rc = cifs_lockv(xid, tcon, |
1091 | cfile->fid.netfid, | |
04a6aa8a PS |
1092 | (__u8)li->type, 0, num, |
1093 | buf); | |
32b9aaf1 PS |
1094 | if (stored_rc) |
1095 | rc = stored_rc; | |
1096 | cur = buf; | |
1097 | num = 0; | |
1098 | } else | |
1099 | cur++; | |
1100 | } | |
1101 | ||
1102 | if (num) { | |
4b4de76e | 1103 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1104 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1105 | if (stored_rc) |
1106 | rc = stored_rc; | |
1107 | } | |
85160e03 PS |
1108 | } |
1109 | ||
32b9aaf1 | 1110 | kfree(buf); |
6d5786a3 | 1111 | free_xid(xid); |
85160e03 PS |
1112 | return rc; |
1113 | } | |
1114 | ||
3d22462a JL |
1115 | static __u32 |
1116 | hash_lockowner(fl_owner_t owner) | |
1117 | { | |
1118 | return cifs_lock_secret ^ hash32_ptr((const void *)owner); | |
1119 | } | |
1120 | ||
d5751469 PS |
1121 | struct lock_to_push { |
1122 | struct list_head llist; | |
1123 | __u64 offset; | |
1124 | __u64 length; | |
1125 | __u32 pid; | |
1126 | __u16 netfid; | |
1127 | __u8 type; | |
1128 | }; | |
1129 | ||
4f6bcec9 | 1130 | static int |
b8db928b | 1131 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1132 | { |
2b0143b5 | 1133 | struct inode *inode = d_inode(cfile->dentry); |
4f6bcec9 | 1134 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
bd61e0a9 JL |
1135 | struct file_lock *flock; |
1136 | struct file_lock_context *flctx = inode->i_flctx; | |
e084c1bd | 1137 | unsigned int count = 0, i; |
4f6bcec9 | 1138 | int rc = 0, xid, type; |
d5751469 PS |
1139 | struct list_head locks_to_send, *el; |
1140 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1141 | __u64 length; |
4f6bcec9 | 1142 | |
6d5786a3 | 1143 | xid = get_xid(); |
4f6bcec9 | 1144 | |
bd61e0a9 JL |
1145 | if (!flctx) |
1146 | goto out; | |
d5751469 | 1147 | |
e084c1bd JL |
1148 | spin_lock(&flctx->flc_lock); |
1149 | list_for_each(el, &flctx->flc_posix) { | |
1150 | count++; | |
1151 | } | |
1152 | spin_unlock(&flctx->flc_lock); | |
1153 | ||
4f6bcec9 PS |
1154 | INIT_LIST_HEAD(&locks_to_send); |
1155 | ||
d5751469 | 1156 | /* |
e084c1bd JL |
1157 | * Allocating count locks is enough because no FL_POSIX locks can be |
1158 | * added to the list while we are holding cinode->lock_sem that | |
ce85852b | 1159 | * protects locking operations of this inode. |
d5751469 | 1160 | */ |
e084c1bd | 1161 | for (i = 0; i < count; i++) { |
d5751469 PS |
1162 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
1163 | if (!lck) { | |
1164 | rc = -ENOMEM; | |
1165 | goto err_out; | |
1166 | } | |
1167 | list_add_tail(&lck->llist, &locks_to_send); | |
1168 | } | |
1169 | ||
d5751469 | 1170 | el = locks_to_send.next; |
6109c850 | 1171 | spin_lock(&flctx->flc_lock); |
bd61e0a9 | 1172 | list_for_each_entry(flock, &flctx->flc_posix, fl_list) { |
d5751469 | 1173 | if (el == &locks_to_send) { |
ce85852b PS |
1174 | /* |
1175 | * The list ended. We don't have enough allocated | |
1176 | * structures - something is really wrong. | |
1177 | */ | |
f96637be | 1178 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1179 | break; |
1180 | } | |
4f6bcec9 PS |
1181 | length = 1 + flock->fl_end - flock->fl_start; |
1182 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1183 | type = CIFS_RDLCK; | |
1184 | else | |
1185 | type = CIFS_WRLCK; | |
d5751469 | 1186 | lck = list_entry(el, struct lock_to_push, llist); |
3d22462a | 1187 | lck->pid = hash_lockowner(flock->fl_owner); |
4b4de76e | 1188 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1189 | lck->length = length; |
1190 | lck->type = type; | |
1191 | lck->offset = flock->fl_start; | |
4f6bcec9 | 1192 | } |
6109c850 | 1193 | spin_unlock(&flctx->flc_lock); |
4f6bcec9 PS |
1194 | |
1195 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1196 | int stored_rc; |
1197 | ||
4f6bcec9 | 1198 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1199 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1200 | lck->type, 0); |
1201 | if (stored_rc) | |
1202 | rc = stored_rc; | |
1203 | list_del(&lck->llist); | |
1204 | kfree(lck); | |
1205 | } | |
1206 | ||
d5751469 | 1207 | out: |
6d5786a3 | 1208 | free_xid(xid); |
4f6bcec9 | 1209 | return rc; |
d5751469 PS |
1210 | err_out: |
1211 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1212 | list_del(&lck->llist); | |
1213 | kfree(lck); | |
1214 | } | |
1215 | goto out; | |
4f6bcec9 PS |
1216 | } |
1217 | ||
9ec3c882 | 1218 | static int |
b8db928b | 1219 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1220 | { |
b8db928b | 1221 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
2b0143b5 | 1222 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
b8db928b | 1223 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1224 | int rc = 0; |
1225 | ||
1226 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1227 | down_write(&cinode->lock_sem); | |
1228 | if (!cinode->can_cache_brlcks) { | |
1229 | up_write(&cinode->lock_sem); | |
1230 | return rc; | |
1231 | } | |
4f6bcec9 | 1232 | |
29e20f9c | 1233 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1234 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1235 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1236 | rc = cifs_push_posix_locks(cfile); |
1237 | else | |
1238 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1239 | |
b8db928b PS |
1240 | cinode->can_cache_brlcks = false; |
1241 | up_write(&cinode->lock_sem); | |
1242 | return rc; | |
4f6bcec9 PS |
1243 | } |
1244 | ||
03776f45 | 1245 | static void |
04a6aa8a | 1246 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1247 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1248 | { |
03776f45 | 1249 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1250 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1251 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1252 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1253 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1254 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1255 | *wait_flag = true; |
1da177e4 | 1256 | } |
03776f45 | 1257 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1258 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1259 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1260 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1261 | if (flock->fl_flags & |
3d6d854a JL |
1262 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1263 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1264 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1265 | |
106dc538 | 1266 | *type = server->vals->large_lock_type; |
03776f45 | 1267 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1268 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1269 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1270 | *lock = 1; |
1271 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1272 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1273 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1274 | *unlock = 1; |
1275 | /* Check if unlock includes more than one lock range */ | |
1276 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1277 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1278 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1279 | *lock = 1; |
1280 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1281 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1282 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1283 | *lock = 1; |
1284 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1285 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1286 | *type |= server->vals->shared_lock_type; |
03776f45 | 1287 | *lock = 1; |
1da177e4 | 1288 | } else |
f96637be | 1289 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1290 | } |
1da177e4 | 1291 | |
03776f45 | 1292 | static int |
04a6aa8a | 1293 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1294 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1295 | { |
1296 | int rc = 0; | |
1297 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1298 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1299 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1300 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1301 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1302 | |
03776f45 PS |
1303 | if (posix_lck) { |
1304 | int posix_lock_type; | |
4f6bcec9 PS |
1305 | |
1306 | rc = cifs_posix_lock_test(file, flock); | |
1307 | if (!rc) | |
1308 | return rc; | |
1309 | ||
106dc538 | 1310 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1311 | posix_lock_type = CIFS_RDLCK; |
1312 | else | |
1313 | posix_lock_type = CIFS_WRLCK; | |
3d22462a JL |
1314 | rc = CIFSSMBPosixLock(xid, tcon, netfid, |
1315 | hash_lockowner(flock->fl_owner), | |
c5fd363d | 1316 | flock->fl_start, length, flock, |
4f6bcec9 | 1317 | posix_lock_type, wait_flag); |
03776f45 PS |
1318 | return rc; |
1319 | } | |
1da177e4 | 1320 | |
fbd35aca | 1321 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1322 | if (!rc) |
1323 | return rc; | |
1324 | ||
03776f45 | 1325 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1326 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1327 | 1, 0, false); | |
03776f45 | 1328 | if (rc == 0) { |
d39a4f71 PS |
1329 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1330 | type, 0, 1, false); | |
03776f45 PS |
1331 | flock->fl_type = F_UNLCK; |
1332 | if (rc != 0) | |
f96637be JP |
1333 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1334 | rc); | |
a88b4707 | 1335 | return 0; |
1da177e4 | 1336 | } |
7ee1af76 | 1337 | |
106dc538 | 1338 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1339 | flock->fl_type = F_WRLCK; |
a88b4707 | 1340 | return 0; |
7ee1af76 JA |
1341 | } |
1342 | ||
d39a4f71 PS |
1343 | type &= ~server->vals->exclusive_lock_type; |
1344 | ||
1345 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1346 | type | server->vals->shared_lock_type, | |
1347 | 1, 0, false); | |
03776f45 | 1348 | if (rc == 0) { |
d39a4f71 PS |
1349 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1350 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1351 | flock->fl_type = F_RDLCK; |
1352 | if (rc != 0) | |
f96637be JP |
1353 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1354 | rc); | |
03776f45 PS |
1355 | } else |
1356 | flock->fl_type = F_WRLCK; | |
1357 | ||
a88b4707 | 1358 | return 0; |
03776f45 PS |
1359 | } |
1360 | ||
f7ba7fe6 | 1361 | void |
9ee305b7 PS |
1362 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1363 | { | |
1364 | struct list_head *li, *tmp; | |
1365 | list_for_each_safe(li, tmp, source) | |
1366 | list_move(li, dest); | |
1367 | } | |
1368 | ||
f7ba7fe6 | 1369 | void |
9ee305b7 PS |
1370 | cifs_free_llist(struct list_head *llist) |
1371 | { | |
1372 | struct cifsLockInfo *li, *tmp; | |
1373 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1374 | cifs_del_lock_waiters(li); | |
1375 | list_del(&li->llist); | |
1376 | kfree(li); | |
1377 | } | |
1378 | } | |
1379 | ||
d39a4f71 | 1380 | int |
6d5786a3 PS |
1381 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1382 | unsigned int xid) | |
9ee305b7 PS |
1383 | { |
1384 | int rc = 0, stored_rc; | |
1385 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1386 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1387 | unsigned int i; | |
0013fb4c | 1388 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1389 | LOCKING_ANDX_RANGE *buf, *cur; |
1390 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2b0143b5 | 1391 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
9ee305b7 PS |
1392 | struct cifsLockInfo *li, *tmp; |
1393 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1394 | struct list_head tmp_llist; | |
1395 | ||
1396 | INIT_LIST_HEAD(&tmp_llist); | |
1397 | ||
0013fb4c PS |
1398 | /* |
1399 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1400 | * and check it for zero before using. | |
1401 | */ | |
1402 | max_buf = tcon->ses->server->maxBuf; | |
1403 | if (!max_buf) | |
1404 | return -EINVAL; | |
1405 | ||
1406 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1407 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1408 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
9ee305b7 PS |
1409 | if (!buf) |
1410 | return -ENOMEM; | |
1411 | ||
1b4b55a1 | 1412 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1413 | for (i = 0; i < 2; i++) { |
1414 | cur = buf; | |
1415 | num = 0; | |
f45d3416 | 1416 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1417 | if (flock->fl_start > li->offset || |
1418 | (flock->fl_start + length) < | |
1419 | (li->offset + li->length)) | |
1420 | continue; | |
1421 | if (current->tgid != li->pid) | |
1422 | continue; | |
9ee305b7 PS |
1423 | if (types[i] != li->type) |
1424 | continue; | |
ea319d57 | 1425 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1426 | /* |
1427 | * We can cache brlock requests - simply remove | |
fbd35aca | 1428 | * a lock from the file's list. |
9ee305b7 PS |
1429 | */ |
1430 | list_del(&li->llist); | |
1431 | cifs_del_lock_waiters(li); | |
1432 | kfree(li); | |
ea319d57 | 1433 | continue; |
9ee305b7 | 1434 | } |
ea319d57 PS |
1435 | cur->Pid = cpu_to_le16(li->pid); |
1436 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1437 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1438 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1439 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1440 | /* | |
1441 | * We need to save a lock here to let us add it again to | |
1442 | * the file's list if the unlock range request fails on | |
1443 | * the server. | |
1444 | */ | |
1445 | list_move(&li->llist, &tmp_llist); | |
1446 | if (++num == max_num) { | |
4b4de76e PS |
1447 | stored_rc = cifs_lockv(xid, tcon, |
1448 | cfile->fid.netfid, | |
ea319d57 PS |
1449 | li->type, num, 0, buf); |
1450 | if (stored_rc) { | |
1451 | /* | |
1452 | * We failed on the unlock range | |
1453 | * request - add all locks from the tmp | |
1454 | * list to the head of the file's list. | |
1455 | */ | |
1456 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1457 | &cfile->llist->locks); |
ea319d57 PS |
1458 | rc = stored_rc; |
1459 | } else | |
1460 | /* | |
1461 | * The unlock range request succeed - | |
1462 | * free the tmp list. | |
1463 | */ | |
1464 | cifs_free_llist(&tmp_llist); | |
1465 | cur = buf; | |
1466 | num = 0; | |
1467 | } else | |
1468 | cur++; | |
9ee305b7 PS |
1469 | } |
1470 | if (num) { | |
4b4de76e | 1471 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1472 | types[i], num, 0, buf); |
1473 | if (stored_rc) { | |
f45d3416 PS |
1474 | cifs_move_llist(&tmp_llist, |
1475 | &cfile->llist->locks); | |
9ee305b7 PS |
1476 | rc = stored_rc; |
1477 | } else | |
1478 | cifs_free_llist(&tmp_llist); | |
1479 | } | |
1480 | } | |
1481 | ||
1b4b55a1 | 1482 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1483 | kfree(buf); |
1484 | return rc; | |
1485 | } | |
1486 | ||
03776f45 | 1487 | static int |
f45d3416 | 1488 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1489 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1490 | unsigned int xid) | |
03776f45 PS |
1491 | { |
1492 | int rc = 0; | |
1493 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1494 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1495 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1496 | struct TCP_Server_Info *server = tcon->ses->server; |
2b0143b5 | 1497 | struct inode *inode = d_inode(cfile->dentry); |
03776f45 PS |
1498 | |
1499 | if (posix_lck) { | |
08547b03 | 1500 | int posix_lock_type; |
4f6bcec9 PS |
1501 | |
1502 | rc = cifs_posix_lock_set(file, flock); | |
1503 | if (!rc || rc < 0) | |
1504 | return rc; | |
1505 | ||
106dc538 | 1506 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1507 | posix_lock_type = CIFS_RDLCK; |
1508 | else | |
1509 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1510 | |
03776f45 | 1511 | if (unlock == 1) |
beb84dc8 | 1512 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1513 | |
f45d3416 | 1514 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
3d22462a JL |
1515 | hash_lockowner(flock->fl_owner), |
1516 | flock->fl_start, length, | |
f45d3416 | 1517 | NULL, posix_lock_type, wait_flag); |
03776f45 PS |
1518 | goto out; |
1519 | } | |
7ee1af76 | 1520 | |
03776f45 | 1521 | if (lock) { |
161ebf9f PS |
1522 | struct cifsLockInfo *lock; |
1523 | ||
fbd35aca | 1524 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1525 | if (!lock) |
1526 | return -ENOMEM; | |
1527 | ||
fbd35aca | 1528 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1529 | if (rc < 0) { |
161ebf9f | 1530 | kfree(lock); |
21cb2d90 PS |
1531 | return rc; |
1532 | } | |
1533 | if (!rc) | |
85160e03 PS |
1534 | goto out; |
1535 | ||
63b7d3a4 PS |
1536 | /* |
1537 | * Windows 7 server can delay breaking lease from read to None | |
1538 | * if we set a byte-range lock on a file - break it explicitly | |
1539 | * before sending the lock to the server to be sure the next | |
1540 | * read won't conflict with non-overlapted locks due to | |
1541 | * pagereading. | |
1542 | */ | |
18cceb6a PS |
1543 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
1544 | CIFS_CACHE_READ(CIFS_I(inode))) { | |
4f73c7d3 | 1545 | cifs_zap_mapping(inode); |
f96637be JP |
1546 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1547 | inode); | |
18cceb6a | 1548 | CIFS_I(inode)->oplock = 0; |
63b7d3a4 PS |
1549 | } |
1550 | ||
d39a4f71 PS |
1551 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1552 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1553 | if (rc) { |
1554 | kfree(lock); | |
21cb2d90 | 1555 | return rc; |
03776f45 | 1556 | } |
161ebf9f | 1557 | |
fbd35aca | 1558 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1559 | } else if (unlock) |
d39a4f71 | 1560 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1561 | |
03776f45 | 1562 | out: |
00b8c95b | 1563 | if (flock->fl_flags & FL_POSIX && !rc) |
4f656367 | 1564 | rc = locks_lock_file_wait(file, flock); |
03776f45 PS |
1565 | return rc; |
1566 | } | |
1567 | ||
1568 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1569 | { | |
1570 | int rc, xid; | |
1571 | int lock = 0, unlock = 0; | |
1572 | bool wait_flag = false; | |
1573 | bool posix_lck = false; | |
1574 | struct cifs_sb_info *cifs_sb; | |
1575 | struct cifs_tcon *tcon; | |
1576 | struct cifsInodeInfo *cinode; | |
1577 | struct cifsFileInfo *cfile; | |
1578 | __u16 netfid; | |
04a6aa8a | 1579 | __u32 type; |
03776f45 PS |
1580 | |
1581 | rc = -EACCES; | |
6d5786a3 | 1582 | xid = get_xid(); |
03776f45 | 1583 | |
f96637be JP |
1584 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1585 | cmd, flock->fl_flags, flock->fl_type, | |
1586 | flock->fl_start, flock->fl_end); | |
03776f45 | 1587 | |
03776f45 PS |
1588 | cfile = (struct cifsFileInfo *)file->private_data; |
1589 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1590 | |
1591 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1592 | tcon->ses->server); | |
1593 | ||
7119e220 | 1594 | cifs_sb = CIFS_FILE_SB(file); |
4b4de76e | 1595 | netfid = cfile->fid.netfid; |
496ad9aa | 1596 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1597 | |
29e20f9c | 1598 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1599 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1600 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1601 | posix_lck = true; | |
1602 | /* | |
1603 | * BB add code here to normalize offset and length to account for | |
1604 | * negative length which we can not accept over the wire. | |
1605 | */ | |
1606 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1607 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1608 | free_xid(xid); |
03776f45 PS |
1609 | return rc; |
1610 | } | |
1611 | ||
1612 | if (!lock && !unlock) { | |
1613 | /* | |
1614 | * if no lock or unlock then nothing to do since we do not | |
1615 | * know what it is | |
1616 | */ | |
6d5786a3 | 1617 | free_xid(xid); |
03776f45 | 1618 | return -EOPNOTSUPP; |
7ee1af76 JA |
1619 | } |
1620 | ||
03776f45 PS |
1621 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1622 | xid); | |
6d5786a3 | 1623 | free_xid(xid); |
1da177e4 LT |
1624 | return rc; |
1625 | } | |
1626 | ||
597b027f JL |
1627 | /* |
1628 | * update the file size (if needed) after a write. Should be called with | |
1629 | * the inode->i_lock held | |
1630 | */ | |
72432ffc | 1631 | void |
fbec9ab9 JL |
1632 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1633 | unsigned int bytes_written) | |
1634 | { | |
1635 | loff_t end_of_write = offset + bytes_written; | |
1636 | ||
1637 | if (end_of_write > cifsi->server_eof) | |
1638 | cifsi->server_eof = end_of_write; | |
1639 | } | |
1640 | ||
ba9ad725 PS |
1641 | static ssize_t |
1642 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1643 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1644 | { |
1645 | int rc = 0; | |
1646 | unsigned int bytes_written = 0; | |
1647 | unsigned int total_written; | |
1648 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1649 | struct cifs_tcon *tcon; |
1650 | struct TCP_Server_Info *server; | |
6d5786a3 | 1651 | unsigned int xid; |
7da4b49a | 1652 | struct dentry *dentry = open_file->dentry; |
2b0143b5 | 1653 | struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry)); |
fa2989f4 | 1654 | struct cifs_io_parms io_parms; |
1da177e4 | 1655 | |
7da4b49a | 1656 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1657 | |
35c265e0 AV |
1658 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n", |
1659 | write_size, *offset, dentry); | |
1da177e4 | 1660 | |
ba9ad725 PS |
1661 | tcon = tlink_tcon(open_file->tlink); |
1662 | server = tcon->ses->server; | |
1663 | ||
1664 | if (!server->ops->sync_write) | |
1665 | return -ENOSYS; | |
50c2f753 | 1666 | |
6d5786a3 | 1667 | xid = get_xid(); |
1da177e4 | 1668 | |
1da177e4 LT |
1669 | for (total_written = 0; write_size > total_written; |
1670 | total_written += bytes_written) { | |
1671 | rc = -EAGAIN; | |
1672 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1673 | struct kvec iov[2]; |
1674 | unsigned int len; | |
1675 | ||
1da177e4 | 1676 | if (open_file->invalidHandle) { |
1da177e4 LT |
1677 | /* we could deadlock if we called |
1678 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1679 | reopen_file not to flush data to |
1da177e4 | 1680 | server now */ |
15886177 | 1681 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1682 | if (rc != 0) |
1683 | break; | |
1684 | } | |
ca83ce3d | 1685 | |
2b0143b5 | 1686 | len = min(server->ops->wp_retry_size(d_inode(dentry)), |
cb7e9eab | 1687 | (unsigned int)write_size - total_written); |
ca83ce3d JL |
1688 | /* iov[0] is reserved for smb header */ |
1689 | iov[1].iov_base = (char *)write_data + total_written; | |
1690 | iov[1].iov_len = len; | |
fa2989f4 | 1691 | io_parms.pid = pid; |
ba9ad725 PS |
1692 | io_parms.tcon = tcon; |
1693 | io_parms.offset = *offset; | |
fa2989f4 | 1694 | io_parms.length = len; |
db8b631d SF |
1695 | rc = server->ops->sync_write(xid, &open_file->fid, |
1696 | &io_parms, &bytes_written, iov, 1); | |
1da177e4 LT |
1697 | } |
1698 | if (rc || (bytes_written == 0)) { | |
1699 | if (total_written) | |
1700 | break; | |
1701 | else { | |
6d5786a3 | 1702 | free_xid(xid); |
1da177e4 LT |
1703 | return rc; |
1704 | } | |
fbec9ab9 | 1705 | } else { |
2b0143b5 | 1706 | spin_lock(&d_inode(dentry)->i_lock); |
ba9ad725 | 1707 | cifs_update_eof(cifsi, *offset, bytes_written); |
2b0143b5 | 1708 | spin_unlock(&d_inode(dentry)->i_lock); |
ba9ad725 | 1709 | *offset += bytes_written; |
fbec9ab9 | 1710 | } |
1da177e4 LT |
1711 | } |
1712 | ||
ba9ad725 | 1713 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1714 | |
7da4b49a | 1715 | if (total_written > 0) { |
2b0143b5 DH |
1716 | spin_lock(&d_inode(dentry)->i_lock); |
1717 | if (*offset > d_inode(dentry)->i_size) | |
1718 | i_size_write(d_inode(dentry), *offset); | |
1719 | spin_unlock(&d_inode(dentry)->i_lock); | |
1da177e4 | 1720 | } |
2b0143b5 | 1721 | mark_inode_dirty_sync(d_inode(dentry)); |
6d5786a3 | 1722 | free_xid(xid); |
1da177e4 LT |
1723 | return total_written; |
1724 | } | |
1725 | ||
6508d904 JL |
1726 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1727 | bool fsuid_only) | |
630f3f0c SF |
1728 | { |
1729 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1730 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1731 | ||
1732 | /* only filter by fsuid on multiuser mounts */ | |
1733 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1734 | fsuid_only = false; | |
630f3f0c | 1735 | |
4477288a | 1736 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1737 | /* we could simply get the first_list_entry since write-only entries |
1738 | are always at the end of the list but since the first entry might | |
1739 | have a close pending, we go through the whole list */ | |
1740 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1741 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1742 | continue; |
2e396b83 | 1743 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1744 | if (!open_file->invalidHandle) { |
1745 | /* found a good file */ | |
1746 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1747 | cifsFileInfo_get_locked(open_file); |
4477288a | 1748 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1749 | return open_file; |
1750 | } /* else might as well continue, and look for | |
1751 | another, or simply have the caller reopen it | |
1752 | again rather than trying to fix this handle */ | |
1753 | } else /* write only file */ | |
1754 | break; /* write only files are last so must be done */ | |
1755 | } | |
4477288a | 1756 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1757 | return NULL; |
1758 | } | |
630f3f0c | 1759 | |
6508d904 JL |
1760 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1761 | bool fsuid_only) | |
6148a742 | 1762 | { |
2c0c2a08 | 1763 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1764 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1765 | bool any_available = false; |
dd99cd80 | 1766 | int rc; |
2c0c2a08 | 1767 | unsigned int refind = 0; |
6148a742 | 1768 | |
60808233 SF |
1769 | /* Having a null inode here (because mapping->host was set to zero by |
1770 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1771 | it being zero) during stress testcases so we need to check for it */ | |
1772 | ||
fb8c4b14 | 1773 | if (cifs_inode == NULL) { |
f96637be | 1774 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1775 | dump_stack(); |
1776 | return NULL; | |
1777 | } | |
1778 | ||
d3892294 JL |
1779 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1780 | ||
6508d904 JL |
1781 | /* only filter by fsuid on multiuser mounts */ |
1782 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1783 | fsuid_only = false; | |
1784 | ||
4477288a | 1785 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1786 | refind_writable: |
2c0c2a08 SP |
1787 | if (refind > MAX_REOPEN_ATT) { |
1788 | spin_unlock(&cifs_file_list_lock); | |
1789 | return NULL; | |
1790 | } | |
6148a742 | 1791 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1792 | if (!any_available && open_file->pid != current->tgid) |
1793 | continue; | |
fef59fd7 | 1794 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1795 | continue; |
2e396b83 | 1796 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1797 | if (!open_file->invalidHandle) { |
1798 | /* found a good writable file */ | |
764a1b1a | 1799 | cifsFileInfo_get_locked(open_file); |
4477288a | 1800 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1801 | return open_file; |
2c0c2a08 SP |
1802 | } else { |
1803 | if (!inv_file) | |
1804 | inv_file = open_file; | |
9b22b0b7 | 1805 | } |
6148a742 SF |
1806 | } |
1807 | } | |
2846d386 JL |
1808 | /* couldn't find useable FH with same pid, try any available */ |
1809 | if (!any_available) { | |
1810 | any_available = true; | |
1811 | goto refind_writable; | |
1812 | } | |
2c0c2a08 SP |
1813 | |
1814 | if (inv_file) { | |
1815 | any_available = false; | |
764a1b1a | 1816 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1817 | } |
1818 | ||
4477288a | 1819 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1820 | |
1821 | if (inv_file) { | |
1822 | rc = cifs_reopen_file(inv_file, false); | |
1823 | if (!rc) | |
1824 | return inv_file; | |
1825 | else { | |
1826 | spin_lock(&cifs_file_list_lock); | |
1827 | list_move_tail(&inv_file->flist, | |
1828 | &cifs_inode->openFileList); | |
1829 | spin_unlock(&cifs_file_list_lock); | |
1830 | cifsFileInfo_put(inv_file); | |
1831 | spin_lock(&cifs_file_list_lock); | |
1832 | ++refind; | |
e1e9bda2 | 1833 | inv_file = NULL; |
2c0c2a08 SP |
1834 | goto refind_writable; |
1835 | } | |
1836 | } | |
1837 | ||
6148a742 SF |
1838 | return NULL; |
1839 | } | |
1840 | ||
1da177e4 LT |
1841 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1842 | { | |
1843 | struct address_space *mapping = page->mapping; | |
09cbfeaf | 1844 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
1da177e4 LT |
1845 | char *write_data; |
1846 | int rc = -EFAULT; | |
1847 | int bytes_written = 0; | |
1da177e4 | 1848 | struct inode *inode; |
6148a742 | 1849 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1850 | |
1851 | if (!mapping || !mapping->host) | |
1852 | return -EFAULT; | |
1853 | ||
1854 | inode = page->mapping->host; | |
1da177e4 LT |
1855 | |
1856 | offset += (loff_t)from; | |
1857 | write_data = kmap(page); | |
1858 | write_data += from; | |
1859 | ||
09cbfeaf | 1860 | if ((to > PAGE_SIZE) || (from > to)) { |
1da177e4 LT |
1861 | kunmap(page); |
1862 | return -EIO; | |
1863 | } | |
1864 | ||
1865 | /* racing with truncate? */ | |
1866 | if (offset > mapping->host->i_size) { | |
1867 | kunmap(page); | |
1868 | return 0; /* don't care */ | |
1869 | } | |
1870 | ||
1871 | /* check to make sure that we are not extending the file */ | |
1872 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1873 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1874 | |
6508d904 | 1875 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1876 | if (open_file) { |
fa2989f4 PS |
1877 | bytes_written = cifs_write(open_file, open_file->pid, |
1878 | write_data, to - from, &offset); | |
6ab409b5 | 1879 | cifsFileInfo_put(open_file); |
1da177e4 | 1880 | /* Does mm or vfs already set times? */ |
6148a742 | 1881 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1882 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1883 | rc = 0; |
bb5a9a04 SF |
1884 | else if (bytes_written < 0) |
1885 | rc = bytes_written; | |
6148a742 | 1886 | } else { |
f96637be | 1887 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1888 | rc = -EIO; |
1889 | } | |
1890 | ||
1891 | kunmap(page); | |
1892 | return rc; | |
1893 | } | |
1894 | ||
90ac1387 PS |
1895 | static struct cifs_writedata * |
1896 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, | |
1897 | pgoff_t end, pgoff_t *index, | |
1898 | unsigned int *found_pages) | |
1899 | { | |
1900 | unsigned int nr_pages; | |
1901 | struct page **pages; | |
1902 | struct cifs_writedata *wdata; | |
1903 | ||
1904 | wdata = cifs_writedata_alloc((unsigned int)tofind, | |
1905 | cifs_writev_complete); | |
1906 | if (!wdata) | |
1907 | return NULL; | |
1908 | ||
1909 | /* | |
1910 | * find_get_pages_tag seems to return a max of 256 on each | |
1911 | * iteration, so we must call it several times in order to | |
1912 | * fill the array or the wsize is effectively limited to | |
ea1754a0 | 1913 | * 256 * PAGE_SIZE. |
90ac1387 PS |
1914 | */ |
1915 | *found_pages = 0; | |
1916 | pages = wdata->pages; | |
1917 | do { | |
1918 | nr_pages = find_get_pages_tag(mapping, index, | |
1919 | PAGECACHE_TAG_DIRTY, tofind, | |
1920 | pages); | |
1921 | *found_pages += nr_pages; | |
1922 | tofind -= nr_pages; | |
1923 | pages += nr_pages; | |
1924 | } while (nr_pages && tofind && *index <= end); | |
1925 | ||
1926 | return wdata; | |
1927 | } | |
1928 | ||
7e48ff82 PS |
1929 | static unsigned int |
1930 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, | |
1931 | struct address_space *mapping, | |
1932 | struct writeback_control *wbc, | |
1933 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) | |
1934 | { | |
1935 | unsigned int nr_pages = 0, i; | |
1936 | struct page *page; | |
1937 | ||
1938 | for (i = 0; i < found_pages; i++) { | |
1939 | page = wdata->pages[i]; | |
1940 | /* | |
1941 | * At this point we hold neither mapping->tree_lock nor | |
1942 | * lock on the page itself: the page may be truncated or | |
1943 | * invalidated (changing page->mapping to NULL), or even | |
1944 | * swizzled back from swapper_space to tmpfs file | |
1945 | * mapping | |
1946 | */ | |
1947 | ||
1948 | if (nr_pages == 0) | |
1949 | lock_page(page); | |
1950 | else if (!trylock_page(page)) | |
1951 | break; | |
1952 | ||
1953 | if (unlikely(page->mapping != mapping)) { | |
1954 | unlock_page(page); | |
1955 | break; | |
1956 | } | |
1957 | ||
1958 | if (!wbc->range_cyclic && page->index > end) { | |
1959 | *done = true; | |
1960 | unlock_page(page); | |
1961 | break; | |
1962 | } | |
1963 | ||
1964 | if (*next && (page->index != *next)) { | |
1965 | /* Not next consecutive page */ | |
1966 | unlock_page(page); | |
1967 | break; | |
1968 | } | |
1969 | ||
1970 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1971 | wait_on_page_writeback(page); | |
1972 | ||
1973 | if (PageWriteback(page) || | |
1974 | !clear_page_dirty_for_io(page)) { | |
1975 | unlock_page(page); | |
1976 | break; | |
1977 | } | |
1978 | ||
1979 | /* | |
1980 | * This actually clears the dirty bit in the radix tree. | |
1981 | * See cifs_writepage() for more commentary. | |
1982 | */ | |
1983 | set_page_writeback(page); | |
1984 | if (page_offset(page) >= i_size_read(mapping->host)) { | |
1985 | *done = true; | |
1986 | unlock_page(page); | |
1987 | end_page_writeback(page); | |
1988 | break; | |
1989 | } | |
1990 | ||
1991 | wdata->pages[i] = page; | |
1992 | *next = page->index + 1; | |
1993 | ++nr_pages; | |
1994 | } | |
1995 | ||
1996 | /* reset index to refind any pages skipped */ | |
1997 | if (nr_pages == 0) | |
1998 | *index = wdata->pages[0]->index + 1; | |
1999 | ||
2000 | /* put any pages we aren't going to use */ | |
2001 | for (i = nr_pages; i < found_pages; i++) { | |
09cbfeaf | 2002 | put_page(wdata->pages[i]); |
7e48ff82 PS |
2003 | wdata->pages[i] = NULL; |
2004 | } | |
2005 | ||
2006 | return nr_pages; | |
2007 | } | |
2008 | ||
619aa48e PS |
2009 | static int |
2010 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, | |
2011 | struct address_space *mapping, struct writeback_control *wbc) | |
2012 | { | |
2013 | int rc = 0; | |
2014 | struct TCP_Server_Info *server; | |
2015 | unsigned int i; | |
2016 | ||
2017 | wdata->sync_mode = wbc->sync_mode; | |
2018 | wdata->nr_pages = nr_pages; | |
2019 | wdata->offset = page_offset(wdata->pages[0]); | |
09cbfeaf | 2020 | wdata->pagesz = PAGE_SIZE; |
619aa48e PS |
2021 | wdata->tailsz = min(i_size_read(mapping->host) - |
2022 | page_offset(wdata->pages[nr_pages - 1]), | |
09cbfeaf KS |
2023 | (loff_t)PAGE_SIZE); |
2024 | wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz; | |
619aa48e | 2025 | |
66231a47 PS |
2026 | if (wdata->cfile != NULL) |
2027 | cifsFileInfo_put(wdata->cfile); | |
2028 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), false); | |
2029 | if (!wdata->cfile) { | |
2030 | cifs_dbg(VFS, "No writable handles for inode\n"); | |
2031 | rc = -EBADF; | |
2032 | } else { | |
619aa48e PS |
2033 | wdata->pid = wdata->cfile->pid; |
2034 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
2035 | rc = server->ops->async_writev(wdata, cifs_writedata_release); | |
66231a47 | 2036 | } |
619aa48e PS |
2037 | |
2038 | for (i = 0; i < nr_pages; ++i) | |
2039 | unlock_page(wdata->pages[i]); | |
2040 | ||
2041 | return rc; | |
2042 | } | |
2043 | ||
1da177e4 | 2044 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 2045 | struct writeback_control *wbc) |
1da177e4 | 2046 | { |
c3d17b63 | 2047 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
cb7e9eab | 2048 | struct TCP_Server_Info *server; |
c3d17b63 JL |
2049 | bool done = false, scanned = false, range_whole = false; |
2050 | pgoff_t end, index; | |
2051 | struct cifs_writedata *wdata; | |
37c0eb46 | 2052 | int rc = 0; |
50c2f753 | 2053 | |
37c0eb46 | 2054 | /* |
c3d17b63 | 2055 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
2056 | * one page at a time via cifs_writepage |
2057 | */ | |
09cbfeaf | 2058 | if (cifs_sb->wsize < PAGE_SIZE) |
37c0eb46 SF |
2059 | return generic_writepages(mapping, wbc); |
2060 | ||
111ebb6e | 2061 | if (wbc->range_cyclic) { |
37c0eb46 | 2062 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
2063 | end = -1; |
2064 | } else { | |
09cbfeaf KS |
2065 | index = wbc->range_start >> PAGE_SHIFT; |
2066 | end = wbc->range_end >> PAGE_SHIFT; | |
111ebb6e | 2067 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
c3d17b63 JL |
2068 | range_whole = true; |
2069 | scanned = true; | |
37c0eb46 | 2070 | } |
cb7e9eab | 2071 | server = cifs_sb_master_tcon(cifs_sb)->ses->server; |
37c0eb46 | 2072 | retry: |
c3d17b63 | 2073 | while (!done && index <= end) { |
cb7e9eab | 2074 | unsigned int i, nr_pages, found_pages, wsize, credits; |
66231a47 | 2075 | pgoff_t next = 0, tofind, saved_index = index; |
c3d17b63 | 2076 | |
cb7e9eab PS |
2077 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, |
2078 | &wsize, &credits); | |
2079 | if (rc) | |
2080 | break; | |
c3d17b63 | 2081 | |
09cbfeaf | 2082 | tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1; |
c3d17b63 | 2083 | |
90ac1387 PS |
2084 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
2085 | &found_pages); | |
c3d17b63 JL |
2086 | if (!wdata) { |
2087 | rc = -ENOMEM; | |
cb7e9eab | 2088 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2089 | break; |
2090 | } | |
2091 | ||
c3d17b63 JL |
2092 | if (found_pages == 0) { |
2093 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2094 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2095 | break; |
2096 | } | |
2097 | ||
7e48ff82 PS |
2098 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
2099 | end, &index, &next, &done); | |
37c0eb46 | 2100 | |
c3d17b63 JL |
2101 | /* nothing to write? */ |
2102 | if (nr_pages == 0) { | |
2103 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2104 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 | 2105 | continue; |
37c0eb46 | 2106 | } |
fbec9ab9 | 2107 | |
cb7e9eab | 2108 | wdata->credits = credits; |
941b853d | 2109 | |
619aa48e | 2110 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); |
f3983c21 | 2111 | |
c3d17b63 JL |
2112 | /* send failure -- clean up the mess */ |
2113 | if (rc != 0) { | |
cb7e9eab | 2114 | add_credits_and_wake_if(server, wdata->credits, 0); |
c3d17b63 | 2115 | for (i = 0; i < nr_pages; ++i) { |
941b853d | 2116 | if (rc == -EAGAIN) |
c3d17b63 JL |
2117 | redirty_page_for_writepage(wbc, |
2118 | wdata->pages[i]); | |
2119 | else | |
2120 | SetPageError(wdata->pages[i]); | |
2121 | end_page_writeback(wdata->pages[i]); | |
09cbfeaf | 2122 | put_page(wdata->pages[i]); |
37c0eb46 | 2123 | } |
941b853d JL |
2124 | if (rc != -EAGAIN) |
2125 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2126 | } |
2127 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2128 | |
66231a47 PS |
2129 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
2130 | index = saved_index; | |
2131 | continue; | |
2132 | } | |
2133 | ||
c3d17b63 JL |
2134 | wbc->nr_to_write -= nr_pages; |
2135 | if (wbc->nr_to_write <= 0) | |
2136 | done = true; | |
b066a48c | 2137 | |
c3d17b63 | 2138 | index = next; |
37c0eb46 | 2139 | } |
c3d17b63 | 2140 | |
37c0eb46 SF |
2141 | if (!scanned && !done) { |
2142 | /* | |
2143 | * We hit the last page and there is more work to be done: wrap | |
2144 | * back to the start of the file | |
2145 | */ | |
c3d17b63 | 2146 | scanned = true; |
37c0eb46 SF |
2147 | index = 0; |
2148 | goto retry; | |
2149 | } | |
c3d17b63 | 2150 | |
111ebb6e | 2151 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2152 | mapping->writeback_index = index; |
2153 | ||
1da177e4 LT |
2154 | return rc; |
2155 | } | |
1da177e4 | 2156 | |
9ad1506b PS |
2157 | static int |
2158 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2159 | { |
9ad1506b | 2160 | int rc; |
6d5786a3 | 2161 | unsigned int xid; |
1da177e4 | 2162 | |
6d5786a3 | 2163 | xid = get_xid(); |
1da177e4 | 2164 | /* BB add check for wbc flags */ |
09cbfeaf | 2165 | get_page(page); |
ad7a2926 | 2166 | if (!PageUptodate(page)) |
f96637be | 2167 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2168 | |
2169 | /* | |
2170 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2171 | * | |
2172 | * A writepage() implementation always needs to do either this, | |
2173 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2174 | * the case of a failure. | |
2175 | * | |
2176 | * Just unlocking the page will cause the radix tree tag-bits | |
2177 | * to fail to update with the state of the page correctly. | |
2178 | */ | |
fb8c4b14 | 2179 | set_page_writeback(page); |
9ad1506b | 2180 | retry_write: |
09cbfeaf | 2181 | rc = cifs_partialpagewrite(page, 0, PAGE_SIZE); |
9ad1506b PS |
2182 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2183 | goto retry_write; | |
2184 | else if (rc == -EAGAIN) | |
2185 | redirty_page_for_writepage(wbc, page); | |
2186 | else if (rc != 0) | |
2187 | SetPageError(page); | |
2188 | else | |
2189 | SetPageUptodate(page); | |
cb876f45 | 2190 | end_page_writeback(page); |
09cbfeaf | 2191 | put_page(page); |
6d5786a3 | 2192 | free_xid(xid); |
1da177e4 LT |
2193 | return rc; |
2194 | } | |
2195 | ||
9ad1506b PS |
2196 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2197 | { | |
2198 | int rc = cifs_writepage_locked(page, wbc); | |
2199 | unlock_page(page); | |
2200 | return rc; | |
2201 | } | |
2202 | ||
d9414774 NP |
2203 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2204 | loff_t pos, unsigned len, unsigned copied, | |
2205 | struct page *page, void *fsdata) | |
1da177e4 | 2206 | { |
d9414774 NP |
2207 | int rc; |
2208 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2209 | struct cifsFileInfo *cfile = file->private_data; |
2210 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2211 | __u32 pid; | |
2212 | ||
2213 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2214 | pid = cfile->pid; | |
2215 | else | |
2216 | pid = current->tgid; | |
1da177e4 | 2217 | |
f96637be | 2218 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2219 | page, pos, copied); |
d9414774 | 2220 | |
a98ee8c1 JL |
2221 | if (PageChecked(page)) { |
2222 | if (copied == len) | |
2223 | SetPageUptodate(page); | |
2224 | ClearPageChecked(page); | |
09cbfeaf | 2225 | } else if (!PageUptodate(page) && copied == PAGE_SIZE) |
d9414774 | 2226 | SetPageUptodate(page); |
ad7a2926 | 2227 | |
1da177e4 | 2228 | if (!PageUptodate(page)) { |
d9414774 | 2229 | char *page_data; |
09cbfeaf | 2230 | unsigned offset = pos & (PAGE_SIZE - 1); |
6d5786a3 | 2231 | unsigned int xid; |
d9414774 | 2232 | |
6d5786a3 | 2233 | xid = get_xid(); |
1da177e4 LT |
2234 | /* this is probably better than directly calling |
2235 | partialpage_write since in this function the file handle is | |
2236 | known which we might as well leverage */ | |
2237 | /* BB check if anything else missing out of ppw | |
2238 | such as updating last write time */ | |
2239 | page_data = kmap(page); | |
d4ffff1f | 2240 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2241 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2242 | kunmap(page); |
d9414774 | 2243 | |
6d5786a3 | 2244 | free_xid(xid); |
fb8c4b14 | 2245 | } else { |
d9414774 NP |
2246 | rc = copied; |
2247 | pos += copied; | |
ca8aa29c | 2248 | set_page_dirty(page); |
1da177e4 LT |
2249 | } |
2250 | ||
d9414774 NP |
2251 | if (rc > 0) { |
2252 | spin_lock(&inode->i_lock); | |
2253 | if (pos > inode->i_size) | |
2254 | i_size_write(inode, pos); | |
2255 | spin_unlock(&inode->i_lock); | |
2256 | } | |
2257 | ||
2258 | unlock_page(page); | |
09cbfeaf | 2259 | put_page(page); |
d9414774 | 2260 | |
1da177e4 LT |
2261 | return rc; |
2262 | } | |
2263 | ||
02c24a82 JB |
2264 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2265 | int datasync) | |
1da177e4 | 2266 | { |
6d5786a3 | 2267 | unsigned int xid; |
1da177e4 | 2268 | int rc = 0; |
96daf2b0 | 2269 | struct cifs_tcon *tcon; |
1d8c4c00 | 2270 | struct TCP_Server_Info *server; |
c21dfb69 | 2271 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2272 | struct inode *inode = file_inode(file); |
8be7e6ba | 2273 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2274 | |
02c24a82 JB |
2275 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2276 | if (rc) | |
2277 | return rc; | |
5955102c | 2278 | inode_lock(inode); |
02c24a82 | 2279 | |
6d5786a3 | 2280 | xid = get_xid(); |
1da177e4 | 2281 | |
35c265e0 AV |
2282 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2283 | file, datasync); | |
50c2f753 | 2284 | |
18cceb6a | 2285 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 2286 | rc = cifs_zap_mapping(inode); |
6feb9891 | 2287 | if (rc) { |
f96637be | 2288 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2289 | rc = 0; /* don't care about it in fsync */ |
2290 | } | |
2291 | } | |
eb4b756b | 2292 | |
8be7e6ba | 2293 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2294 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2295 | server = tcon->ses->server; | |
2296 | if (server->ops->flush) | |
2297 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2298 | else | |
2299 | rc = -ENOSYS; | |
2300 | } | |
8be7e6ba | 2301 | |
6d5786a3 | 2302 | free_xid(xid); |
5955102c | 2303 | inode_unlock(inode); |
8be7e6ba PS |
2304 | return rc; |
2305 | } | |
2306 | ||
02c24a82 | 2307 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2308 | { |
6d5786a3 | 2309 | unsigned int xid; |
8be7e6ba | 2310 | int rc = 0; |
96daf2b0 | 2311 | struct cifs_tcon *tcon; |
1d8c4c00 | 2312 | struct TCP_Server_Info *server; |
8be7e6ba | 2313 | struct cifsFileInfo *smbfile = file->private_data; |
7119e220 | 2314 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
02c24a82 JB |
2315 | struct inode *inode = file->f_mapping->host; |
2316 | ||
2317 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2318 | if (rc) | |
2319 | return rc; | |
5955102c | 2320 | inode_lock(inode); |
8be7e6ba | 2321 | |
6d5786a3 | 2322 | xid = get_xid(); |
8be7e6ba | 2323 | |
35c265e0 AV |
2324 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2325 | file, datasync); | |
8be7e6ba PS |
2326 | |
2327 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2328 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2329 | server = tcon->ses->server; | |
2330 | if (server->ops->flush) | |
2331 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2332 | else | |
2333 | rc = -ENOSYS; | |
2334 | } | |
b298f223 | 2335 | |
6d5786a3 | 2336 | free_xid(xid); |
5955102c | 2337 | inode_unlock(inode); |
1da177e4 LT |
2338 | return rc; |
2339 | } | |
2340 | ||
1da177e4 LT |
2341 | /* |
2342 | * As file closes, flush all cached write data for this inode checking | |
2343 | * for write behind errors. | |
2344 | */ | |
75e1fcc0 | 2345 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2346 | { |
496ad9aa | 2347 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2348 | int rc = 0; |
2349 | ||
eb4b756b | 2350 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2351 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2352 | |
f96637be | 2353 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2354 | |
2355 | return rc; | |
2356 | } | |
2357 | ||
72432ffc PS |
2358 | static int |
2359 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2360 | { | |
2361 | int rc = 0; | |
2362 | unsigned long i; | |
2363 | ||
2364 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2365 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2366 | if (!pages[i]) { |
2367 | /* | |
2368 | * save number of pages we have already allocated and | |
2369 | * return with ENOMEM error | |
2370 | */ | |
2371 | num_pages = i; | |
2372 | rc = -ENOMEM; | |
e94f7ba1 | 2373 | break; |
72432ffc PS |
2374 | } |
2375 | } | |
2376 | ||
e94f7ba1 JL |
2377 | if (rc) { |
2378 | for (i = 0; i < num_pages; i++) | |
2379 | put_page(pages[i]); | |
2380 | } | |
72432ffc PS |
2381 | return rc; |
2382 | } | |
2383 | ||
2384 | static inline | |
2385 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2386 | { | |
2387 | size_t num_pages; | |
2388 | size_t clen; | |
2389 | ||
2390 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2391 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2392 | |
2393 | if (cur_len) | |
2394 | *cur_len = clen; | |
2395 | ||
2396 | return num_pages; | |
2397 | } | |
2398 | ||
da82f7e7 | 2399 | static void |
4a5c80d7 | 2400 | cifs_uncached_writedata_release(struct kref *refcount) |
da82f7e7 JL |
2401 | { |
2402 | int i; | |
4a5c80d7 SF |
2403 | struct cifs_writedata *wdata = container_of(refcount, |
2404 | struct cifs_writedata, refcount); | |
2405 | ||
2406 | for (i = 0; i < wdata->nr_pages; i++) | |
2407 | put_page(wdata->pages[i]); | |
2408 | cifs_writedata_release(refcount); | |
2409 | } | |
2410 | ||
2411 | static void | |
2412 | cifs_uncached_writev_complete(struct work_struct *work) | |
2413 | { | |
da82f7e7 JL |
2414 | struct cifs_writedata *wdata = container_of(work, |
2415 | struct cifs_writedata, work); | |
2b0143b5 | 2416 | struct inode *inode = d_inode(wdata->cfile->dentry); |
da82f7e7 JL |
2417 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
2418 | ||
2419 | spin_lock(&inode->i_lock); | |
2420 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2421 | if (cifsi->server_eof > inode->i_size) | |
2422 | i_size_write(inode, cifsi->server_eof); | |
2423 | spin_unlock(&inode->i_lock); | |
2424 | ||
2425 | complete(&wdata->done); | |
2426 | ||
4a5c80d7 | 2427 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
da82f7e7 JL |
2428 | } |
2429 | ||
da82f7e7 | 2430 | static int |
66386c08 PS |
2431 | wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from, |
2432 | size_t *len, unsigned long *num_pages) | |
da82f7e7 | 2433 | { |
66386c08 PS |
2434 | size_t save_len, copied, bytes, cur_len = *len; |
2435 | unsigned long i, nr_pages = *num_pages; | |
c9de5c80 | 2436 | |
66386c08 PS |
2437 | save_len = cur_len; |
2438 | for (i = 0; i < nr_pages; i++) { | |
2439 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); | |
2440 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from); | |
2441 | cur_len -= copied; | |
2442 | /* | |
2443 | * If we didn't copy as much as we expected, then that | |
2444 | * may mean we trod into an unmapped area. Stop copying | |
2445 | * at that point. On the next pass through the big | |
2446 | * loop, we'll likely end up getting a zero-length | |
2447 | * write and bailing out of it. | |
2448 | */ | |
2449 | if (copied < bytes) | |
2450 | break; | |
2451 | } | |
2452 | cur_len = save_len - cur_len; | |
2453 | *len = cur_len; | |
da82f7e7 | 2454 | |
66386c08 PS |
2455 | /* |
2456 | * If we have no data to send, then that probably means that | |
2457 | * the copy above failed altogether. That's most likely because | |
2458 | * the address in the iovec was bogus. Return -EFAULT and let | |
2459 | * the caller free anything we allocated and bail out. | |
2460 | */ | |
2461 | if (!cur_len) | |
2462 | return -EFAULT; | |
da82f7e7 | 2463 | |
66386c08 PS |
2464 | /* |
2465 | * i + 1 now represents the number of pages we actually used in | |
2466 | * the copy phase above. | |
2467 | */ | |
2468 | *num_pages = i + 1; | |
2469 | return 0; | |
da82f7e7 JL |
2470 | } |
2471 | ||
43de94ea PS |
2472 | static int |
2473 | cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, | |
2474 | struct cifsFileInfo *open_file, | |
2475 | struct cifs_sb_info *cifs_sb, struct list_head *wdata_list) | |
72432ffc | 2476 | { |
43de94ea PS |
2477 | int rc = 0; |
2478 | size_t cur_len; | |
66386c08 | 2479 | unsigned long nr_pages, num_pages, i; |
43de94ea | 2480 | struct cifs_writedata *wdata; |
6ec0b01b PS |
2481 | struct iov_iter saved_from; |
2482 | loff_t saved_offset = offset; | |
da82f7e7 | 2483 | pid_t pid; |
6ec0b01b | 2484 | struct TCP_Server_Info *server; |
d4ffff1f PS |
2485 | |
2486 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2487 | pid = open_file->pid; | |
2488 | else | |
2489 | pid = current->tgid; | |
2490 | ||
6ec0b01b PS |
2491 | server = tlink_tcon(open_file->tlink)->ses->server; |
2492 | memcpy(&saved_from, from, sizeof(struct iov_iter)); | |
2493 | ||
72432ffc | 2494 | do { |
cb7e9eab PS |
2495 | unsigned int wsize, credits; |
2496 | ||
2497 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, | |
2498 | &wsize, &credits); | |
2499 | if (rc) | |
2500 | break; | |
da82f7e7 | 2501 | |
cb7e9eab | 2502 | nr_pages = get_numpages(wsize, len, &cur_len); |
da82f7e7 JL |
2503 | wdata = cifs_writedata_alloc(nr_pages, |
2504 | cifs_uncached_writev_complete); | |
2505 | if (!wdata) { | |
2506 | rc = -ENOMEM; | |
cb7e9eab | 2507 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2508 | break; |
2509 | } | |
2510 | ||
2511 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2512 | if (rc) { | |
2513 | kfree(wdata); | |
cb7e9eab | 2514 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2515 | break; |
2516 | } | |
2517 | ||
66386c08 PS |
2518 | num_pages = nr_pages; |
2519 | rc = wdata_fill_from_iovec(wdata, from, &cur_len, &num_pages); | |
2520 | if (rc) { | |
5d81de8e JL |
2521 | for (i = 0; i < nr_pages; i++) |
2522 | put_page(wdata->pages[i]); | |
2523 | kfree(wdata); | |
cb7e9eab | 2524 | add_credits_and_wake_if(server, credits, 0); |
5d81de8e JL |
2525 | break; |
2526 | } | |
2527 | ||
2528 | /* | |
66386c08 PS |
2529 | * Bring nr_pages down to the number of pages we actually used, |
2530 | * and free any pages that we didn't use. | |
5d81de8e | 2531 | */ |
66386c08 | 2532 | for ( ; nr_pages > num_pages; nr_pages--) |
5d81de8e JL |
2533 | put_page(wdata->pages[nr_pages - 1]); |
2534 | ||
da82f7e7 JL |
2535 | wdata->sync_mode = WB_SYNC_ALL; |
2536 | wdata->nr_pages = nr_pages; | |
2537 | wdata->offset = (__u64)offset; | |
2538 | wdata->cfile = cifsFileInfo_get(open_file); | |
2539 | wdata->pid = pid; | |
2540 | wdata->bytes = cur_len; | |
eddb079d JL |
2541 | wdata->pagesz = PAGE_SIZE; |
2542 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
cb7e9eab | 2543 | wdata->credits = credits; |
6ec0b01b PS |
2544 | |
2545 | if (!wdata->cfile->invalidHandle || | |
2546 | !cifs_reopen_file(wdata->cfile, false)) | |
2547 | rc = server->ops->async_writev(wdata, | |
2548 | cifs_uncached_writedata_release); | |
da82f7e7 | 2549 | if (rc) { |
cb7e9eab | 2550 | add_credits_and_wake_if(server, wdata->credits, 0); |
4a5c80d7 SF |
2551 | kref_put(&wdata->refcount, |
2552 | cifs_uncached_writedata_release); | |
6ec0b01b PS |
2553 | if (rc == -EAGAIN) { |
2554 | memcpy(from, &saved_from, | |
2555 | sizeof(struct iov_iter)); | |
2556 | iov_iter_advance(from, offset - saved_offset); | |
2557 | continue; | |
2558 | } | |
72432ffc PS |
2559 | break; |
2560 | } | |
2561 | ||
43de94ea | 2562 | list_add_tail(&wdata->list, wdata_list); |
da82f7e7 JL |
2563 | offset += cur_len; |
2564 | len -= cur_len; | |
72432ffc PS |
2565 | } while (len > 0); |
2566 | ||
43de94ea PS |
2567 | return rc; |
2568 | } | |
2569 | ||
e9d1593d | 2570 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) |
43de94ea | 2571 | { |
e9d1593d | 2572 | struct file *file = iocb->ki_filp; |
43de94ea PS |
2573 | ssize_t total_written = 0; |
2574 | struct cifsFileInfo *open_file; | |
2575 | struct cifs_tcon *tcon; | |
2576 | struct cifs_sb_info *cifs_sb; | |
2577 | struct cifs_writedata *wdata, *tmp; | |
2578 | struct list_head wdata_list; | |
6ec0b01b | 2579 | struct iov_iter saved_from; |
43de94ea PS |
2580 | int rc; |
2581 | ||
e9d1593d AV |
2582 | /* |
2583 | * BB - optimize the way when signing is disabled. We can drop this | |
2584 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2585 | * write request. | |
2586 | */ | |
2587 | ||
3309dd04 AV |
2588 | rc = generic_write_checks(iocb, from); |
2589 | if (rc <= 0) | |
43de94ea PS |
2590 | return rc; |
2591 | ||
43de94ea | 2592 | INIT_LIST_HEAD(&wdata_list); |
7119e220 | 2593 | cifs_sb = CIFS_FILE_SB(file); |
43de94ea PS |
2594 | open_file = file->private_data; |
2595 | tcon = tlink_tcon(open_file->tlink); | |
2596 | ||
2597 | if (!tcon->ses->server->ops->async_writev) | |
2598 | return -ENOSYS; | |
2599 | ||
6ec0b01b PS |
2600 | memcpy(&saved_from, from, sizeof(struct iov_iter)); |
2601 | ||
3309dd04 AV |
2602 | rc = cifs_write_from_iter(iocb->ki_pos, iov_iter_count(from), from, |
2603 | open_file, cifs_sb, &wdata_list); | |
43de94ea | 2604 | |
da82f7e7 JL |
2605 | /* |
2606 | * If at least one write was successfully sent, then discard any rc | |
2607 | * value from the later writes. If the other write succeeds, then | |
2608 | * we'll end up returning whatever was written. If it fails, then | |
2609 | * we'll get a new rc value from that. | |
2610 | */ | |
2611 | if (!list_empty(&wdata_list)) | |
2612 | rc = 0; | |
2613 | ||
2614 | /* | |
2615 | * Wait for and collect replies for any successful sends in order of | |
2616 | * increasing offset. Once an error is hit or we get a fatal signal | |
2617 | * while waiting, then return without waiting for any more replies. | |
2618 | */ | |
2619 | restart_loop: | |
2620 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2621 | if (!rc) { | |
2622 | /* FIXME: freezable too? */ | |
2623 | rc = wait_for_completion_killable(&wdata->done); | |
2624 | if (rc) | |
2625 | rc = -EINTR; | |
2626 | else if (wdata->result) | |
2627 | rc = wdata->result; | |
2628 | else | |
2629 | total_written += wdata->bytes; | |
2630 | ||
2631 | /* resend call if it's a retryable error */ | |
2632 | if (rc == -EAGAIN) { | |
6ec0b01b PS |
2633 | struct list_head tmp_list; |
2634 | struct iov_iter tmp_from; | |
2635 | ||
2636 | INIT_LIST_HEAD(&tmp_list); | |
2637 | list_del_init(&wdata->list); | |
2638 | ||
2639 | memcpy(&tmp_from, &saved_from, | |
2640 | sizeof(struct iov_iter)); | |
2641 | iov_iter_advance(&tmp_from, | |
e9d1593d | 2642 | wdata->offset - iocb->ki_pos); |
6ec0b01b PS |
2643 | |
2644 | rc = cifs_write_from_iter(wdata->offset, | |
2645 | wdata->bytes, &tmp_from, | |
2646 | open_file, cifs_sb, &tmp_list); | |
2647 | ||
2648 | list_splice(&tmp_list, &wdata_list); | |
2649 | ||
2650 | kref_put(&wdata->refcount, | |
2651 | cifs_uncached_writedata_release); | |
da82f7e7 JL |
2652 | goto restart_loop; |
2653 | } | |
2654 | } | |
2655 | list_del_init(&wdata->list); | |
4a5c80d7 | 2656 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
72432ffc PS |
2657 | } |
2658 | ||
e9d1593d AV |
2659 | if (unlikely(!total_written)) |
2660 | return rc; | |
72432ffc | 2661 | |
e9d1593d AV |
2662 | iocb->ki_pos += total_written; |
2663 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(file_inode(file))->flags); | |
da82f7e7 | 2664 | cifs_stats_bytes_written(tcon, total_written); |
e9d1593d | 2665 | return total_written; |
72432ffc PS |
2666 | } |
2667 | ||
579f9053 | 2668 | static ssize_t |
3dae8750 | 2669 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc | 2670 | { |
579f9053 PS |
2671 | struct file *file = iocb->ki_filp; |
2672 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2673 | struct inode *inode = file->f_mapping->host; | |
2674 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2675 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
5f380c7f | 2676 | ssize_t rc; |
72432ffc | 2677 | |
579f9053 PS |
2678 | /* |
2679 | * We need to hold the sem to be sure nobody modifies lock list | |
2680 | * with a brlock that prevents writing. | |
2681 | */ | |
2682 | down_read(&cinode->lock_sem); | |
5955102c | 2683 | inode_lock(inode); |
5f380c7f | 2684 | |
3309dd04 AV |
2685 | rc = generic_write_checks(iocb, from); |
2686 | if (rc <= 0) | |
5f380c7f AV |
2687 | goto out; |
2688 | ||
5f380c7f | 2689 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), |
579f9053 | 2690 | server->vals->exclusive_lock_type, NULL, |
5f380c7f | 2691 | CIFS_WRITE_OP)) |
3dae8750 | 2692 | rc = __generic_file_write_iter(iocb, from); |
5f380c7f AV |
2693 | else |
2694 | rc = -EACCES; | |
2695 | out: | |
5955102c | 2696 | inode_unlock(inode); |
19dfc1f5 | 2697 | |
e2592217 CH |
2698 | if (rc > 0) |
2699 | rc = generic_write_sync(iocb, rc); | |
579f9053 | 2700 | up_read(&cinode->lock_sem); |
579f9053 PS |
2701 | return rc; |
2702 | } | |
2703 | ||
2704 | ssize_t | |
3dae8750 | 2705 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
579f9053 | 2706 | { |
496ad9aa | 2707 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2708 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2709 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2710 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2711 | iocb->ki_filp->private_data; | |
2712 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2713 | ssize_t written; |
ca8aa29c | 2714 | |
c11f1df5 SP |
2715 | written = cifs_get_writer(cinode); |
2716 | if (written) | |
2717 | return written; | |
2718 | ||
18cceb6a | 2719 | if (CIFS_CACHE_WRITE(cinode)) { |
88cf75aa PS |
2720 | if (cap_unix(tcon->ses) && |
2721 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
c11f1df5 | 2722 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
3dae8750 | 2723 | written = generic_file_write_iter(iocb, from); |
c11f1df5 SP |
2724 | goto out; |
2725 | } | |
3dae8750 | 2726 | written = cifs_writev(iocb, from); |
c11f1df5 | 2727 | goto out; |
25078105 | 2728 | } |
25078105 | 2729 | /* |
ca8aa29c PS |
2730 | * For non-oplocked files in strict cache mode we need to write the data |
2731 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2732 | * affected pages because it may cause a error with mandatory locks on | |
2733 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2734 | */ |
3dae8750 | 2735 | written = cifs_user_writev(iocb, from); |
18cceb6a | 2736 | if (written > 0 && CIFS_CACHE_READ(cinode)) { |
88cf75aa PS |
2737 | /* |
2738 | * Windows 7 server can delay breaking level2 oplock if a write | |
2739 | * request comes - break it on the client to prevent reading | |
2740 | * an old data. | |
2741 | */ | |
4f73c7d3 | 2742 | cifs_zap_mapping(inode); |
f96637be JP |
2743 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2744 | inode); | |
18cceb6a | 2745 | cinode->oplock = 0; |
88cf75aa | 2746 | } |
c11f1df5 SP |
2747 | out: |
2748 | cifs_put_writer(cinode); | |
88cf75aa | 2749 | return written; |
72432ffc PS |
2750 | } |
2751 | ||
0471ca3f | 2752 | static struct cifs_readdata * |
f4e49cd2 | 2753 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2754 | { |
2755 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2756 | |
c5fab6f4 JL |
2757 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2758 | GFP_KERNEL); | |
0471ca3f | 2759 | if (rdata != NULL) { |
6993f74a | 2760 | kref_init(&rdata->refcount); |
1c892549 JL |
2761 | INIT_LIST_HEAD(&rdata->list); |
2762 | init_completion(&rdata->done); | |
0471ca3f | 2763 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2764 | } |
f4e49cd2 | 2765 | |
0471ca3f JL |
2766 | return rdata; |
2767 | } | |
2768 | ||
6993f74a JL |
2769 | void |
2770 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2771 | { |
6993f74a JL |
2772 | struct cifs_readdata *rdata = container_of(refcount, |
2773 | struct cifs_readdata, refcount); | |
2774 | ||
2775 | if (rdata->cfile) | |
2776 | cifsFileInfo_put(rdata->cfile); | |
2777 | ||
0471ca3f JL |
2778 | kfree(rdata); |
2779 | } | |
2780 | ||
1c892549 | 2781 | static int |
c5fab6f4 | 2782 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2783 | { |
2784 | int rc = 0; | |
c5fab6f4 | 2785 | struct page *page; |
1c892549 JL |
2786 | unsigned int i; |
2787 | ||
c5fab6f4 | 2788 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2789 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2790 | if (!page) { | |
2791 | rc = -ENOMEM; | |
2792 | break; | |
2793 | } | |
c5fab6f4 | 2794 | rdata->pages[i] = page; |
1c892549 JL |
2795 | } |
2796 | ||
2797 | if (rc) { | |
c5fab6f4 JL |
2798 | for (i = 0; i < nr_pages; i++) { |
2799 | put_page(rdata->pages[i]); | |
2800 | rdata->pages[i] = NULL; | |
1c892549 JL |
2801 | } |
2802 | } | |
2803 | return rc; | |
2804 | } | |
2805 | ||
2806 | static void | |
2807 | cifs_uncached_readdata_release(struct kref *refcount) | |
2808 | { | |
1c892549 JL |
2809 | struct cifs_readdata *rdata = container_of(refcount, |
2810 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2811 | unsigned int i; |
1c892549 | 2812 | |
c5fab6f4 JL |
2813 | for (i = 0; i < rdata->nr_pages; i++) { |
2814 | put_page(rdata->pages[i]); | |
2815 | rdata->pages[i] = NULL; | |
1c892549 JL |
2816 | } |
2817 | cifs_readdata_release(refcount); | |
2818 | } | |
2819 | ||
1c892549 JL |
2820 | /** |
2821 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2822 | * @rdata: the readdata response with list of pages holding data | |
7f25bba8 | 2823 | * @iter: destination for our data |
1c892549 JL |
2824 | * |
2825 | * This function copies data from a list of pages in a readdata response into | |
2826 | * an array of iovecs. It will first calculate where the data should go | |
2827 | * based on the info in the readdata and then copy the data into that spot. | |
2828 | */ | |
7f25bba8 AV |
2829 | static int |
2830 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) | |
1c892549 | 2831 | { |
34a54d61 | 2832 | size_t remaining = rdata->got_bytes; |
c5fab6f4 | 2833 | unsigned int i; |
1c892549 | 2834 | |
c5fab6f4 | 2835 | for (i = 0; i < rdata->nr_pages; i++) { |
c5fab6f4 | 2836 | struct page *page = rdata->pages[i]; |
e686bd8d | 2837 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
7f25bba8 AV |
2838 | size_t written = copy_page_to_iter(page, 0, copy, iter); |
2839 | remaining -= written; | |
2840 | if (written < copy && iov_iter_count(iter) > 0) | |
2841 | break; | |
1c892549 | 2842 | } |
7f25bba8 | 2843 | return remaining ? -EFAULT : 0; |
1c892549 JL |
2844 | } |
2845 | ||
2846 | static void | |
2847 | cifs_uncached_readv_complete(struct work_struct *work) | |
2848 | { | |
2849 | struct cifs_readdata *rdata = container_of(work, | |
2850 | struct cifs_readdata, work); | |
1c892549 JL |
2851 | |
2852 | complete(&rdata->done); | |
2853 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2854 | } | |
2855 | ||
2856 | static int | |
8321fec4 JL |
2857 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2858 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2859 | { |
b3160aeb | 2860 | int result = 0; |
c5fab6f4 JL |
2861 | unsigned int i; |
2862 | unsigned int nr_pages = rdata->nr_pages; | |
1c892549 | 2863 | |
b3160aeb | 2864 | rdata->got_bytes = 0; |
8321fec4 | 2865 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2866 | for (i = 0; i < nr_pages; i++) { |
2867 | struct page *page = rdata->pages[i]; | |
71335664 | 2868 | size_t n; |
c5fab6f4 | 2869 | |
71335664 | 2870 | if (len <= 0) { |
1c892549 | 2871 | /* no need to hold page hostage */ |
c5fab6f4 JL |
2872 | rdata->pages[i] = NULL; |
2873 | rdata->nr_pages--; | |
1c892549 | 2874 | put_page(page); |
8321fec4 | 2875 | continue; |
1c892549 | 2876 | } |
71335664 AV |
2877 | n = len; |
2878 | if (len >= PAGE_SIZE) { | |
2879 | /* enough data to fill the page */ | |
2880 | n = PAGE_SIZE; | |
2881 | len -= n; | |
2882 | } else { | |
2883 | zero_user(page, len, PAGE_SIZE - len); | |
2884 | rdata->tailsz = len; | |
2885 | len = 0; | |
2886 | } | |
2887 | result = cifs_read_page_from_socket(server, page, n); | |
8321fec4 JL |
2888 | if (result < 0) |
2889 | break; | |
2890 | ||
b3160aeb | 2891 | rdata->got_bytes += result; |
1c892549 JL |
2892 | } |
2893 | ||
b3160aeb PS |
2894 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
2895 | rdata->got_bytes : result; | |
1c892549 JL |
2896 | } |
2897 | ||
0ada36b2 PS |
2898 | static int |
2899 | cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, | |
2900 | struct cifs_sb_info *cifs_sb, struct list_head *rdata_list) | |
1da177e4 | 2901 | { |
0ada36b2 | 2902 | struct cifs_readdata *rdata; |
bed9da02 | 2903 | unsigned int npages, rsize, credits; |
0ada36b2 PS |
2904 | size_t cur_len; |
2905 | int rc; | |
1c892549 | 2906 | pid_t pid; |
25f40259 | 2907 | struct TCP_Server_Info *server; |
a70307ee | 2908 | |
25f40259 | 2909 | server = tlink_tcon(open_file->tlink)->ses->server; |
fc9c5966 | 2910 | |
d4ffff1f PS |
2911 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2912 | pid = open_file->pid; | |
2913 | else | |
2914 | pid = current->tgid; | |
2915 | ||
1c892549 | 2916 | do { |
bed9da02 PS |
2917 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
2918 | &rsize, &credits); | |
2919 | if (rc) | |
2920 | break; | |
2921 | ||
2922 | cur_len = min_t(const size_t, len, rsize); | |
1c892549 | 2923 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); |
a70307ee | 2924 | |
1c892549 JL |
2925 | /* allocate a readdata struct */ |
2926 | rdata = cifs_readdata_alloc(npages, | |
2927 | cifs_uncached_readv_complete); | |
2928 | if (!rdata) { | |
bed9da02 | 2929 | add_credits_and_wake_if(server, credits, 0); |
1c892549 | 2930 | rc = -ENOMEM; |
bae9f746 | 2931 | break; |
1da177e4 | 2932 | } |
a70307ee | 2933 | |
c5fab6f4 | 2934 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2935 | if (rc) |
2936 | goto error; | |
2937 | ||
2938 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2939 | rdata->nr_pages = npages; |
1c892549 JL |
2940 | rdata->offset = offset; |
2941 | rdata->bytes = cur_len; | |
2942 | rdata->pid = pid; | |
8321fec4 JL |
2943 | rdata->pagesz = PAGE_SIZE; |
2944 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
bed9da02 | 2945 | rdata->credits = credits; |
1c892549 | 2946 | |
25f40259 PS |
2947 | if (!rdata->cfile->invalidHandle || |
2948 | !cifs_reopen_file(rdata->cfile, true)) | |
2949 | rc = server->ops->async_readv(rdata); | |
1c892549 JL |
2950 | error: |
2951 | if (rc) { | |
bed9da02 | 2952 | add_credits_and_wake_if(server, rdata->credits, 0); |
1c892549 JL |
2953 | kref_put(&rdata->refcount, |
2954 | cifs_uncached_readdata_release); | |
25f40259 PS |
2955 | if (rc == -EAGAIN) |
2956 | continue; | |
1c892549 JL |
2957 | break; |
2958 | } | |
2959 | ||
0ada36b2 | 2960 | list_add_tail(&rdata->list, rdata_list); |
1c892549 JL |
2961 | offset += cur_len; |
2962 | len -= cur_len; | |
2963 | } while (len > 0); | |
2964 | ||
0ada36b2 PS |
2965 | return rc; |
2966 | } | |
2967 | ||
2968 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) | |
2969 | { | |
2970 | struct file *file = iocb->ki_filp; | |
2971 | ssize_t rc; | |
2972 | size_t len; | |
2973 | ssize_t total_read = 0; | |
2974 | loff_t offset = iocb->ki_pos; | |
2975 | struct cifs_sb_info *cifs_sb; | |
2976 | struct cifs_tcon *tcon; | |
2977 | struct cifsFileInfo *open_file; | |
2978 | struct cifs_readdata *rdata, *tmp; | |
2979 | struct list_head rdata_list; | |
2980 | ||
2981 | len = iov_iter_count(to); | |
2982 | if (!len) | |
2983 | return 0; | |
2984 | ||
2985 | INIT_LIST_HEAD(&rdata_list); | |
7119e220 | 2986 | cifs_sb = CIFS_FILE_SB(file); |
0ada36b2 PS |
2987 | open_file = file->private_data; |
2988 | tcon = tlink_tcon(open_file->tlink); | |
2989 | ||
2990 | if (!tcon->ses->server->ops->async_readv) | |
2991 | return -ENOSYS; | |
2992 | ||
2993 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
2994 | cifs_dbg(FYI, "attempting read on write only file instance\n"); | |
2995 | ||
2996 | rc = cifs_send_async_read(offset, len, open_file, cifs_sb, &rdata_list); | |
2997 | ||
1c892549 JL |
2998 | /* if at least one read request send succeeded, then reset rc */ |
2999 | if (!list_empty(&rdata_list)) | |
3000 | rc = 0; | |
3001 | ||
e6a7bcb4 | 3002 | len = iov_iter_count(to); |
1c892549 | 3003 | /* the loop below should proceed in the order of increasing offsets */ |
25f40259 | 3004 | again: |
1c892549 JL |
3005 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { |
3006 | if (!rc) { | |
1c892549 JL |
3007 | /* FIXME: freezable sleep too? */ |
3008 | rc = wait_for_completion_killable(&rdata->done); | |
3009 | if (rc) | |
3010 | rc = -EINTR; | |
fb8a3e52 | 3011 | else if (rdata->result == -EAGAIN) { |
74027f4a | 3012 | /* resend call if it's a retryable error */ |
fb8a3e52 | 3013 | struct list_head tmp_list; |
d913ed17 | 3014 | unsigned int got_bytes = rdata->got_bytes; |
25f40259 | 3015 | |
fb8a3e52 PS |
3016 | list_del_init(&rdata->list); |
3017 | INIT_LIST_HEAD(&tmp_list); | |
25f40259 | 3018 | |
d913ed17 PS |
3019 | /* |
3020 | * Got a part of data and then reconnect has | |
3021 | * happened -- fill the buffer and continue | |
3022 | * reading. | |
3023 | */ | |
3024 | if (got_bytes && got_bytes < rdata->bytes) { | |
3025 | rc = cifs_readdata_to_iov(rdata, to); | |
3026 | if (rc) { | |
3027 | kref_put(&rdata->refcount, | |
3028 | cifs_uncached_readdata_release); | |
3029 | continue; | |
3030 | } | |
74027f4a | 3031 | } |
d913ed17 PS |
3032 | |
3033 | rc = cifs_send_async_read( | |
3034 | rdata->offset + got_bytes, | |
3035 | rdata->bytes - got_bytes, | |
3036 | rdata->cfile, cifs_sb, | |
3037 | &tmp_list); | |
25f40259 | 3038 | |
fb8a3e52 | 3039 | list_splice(&tmp_list, &rdata_list); |
25f40259 | 3040 | |
fb8a3e52 PS |
3041 | kref_put(&rdata->refcount, |
3042 | cifs_uncached_readdata_release); | |
3043 | goto again; | |
3044 | } else if (rdata->result) | |
3045 | rc = rdata->result; | |
3046 | else | |
e6a7bcb4 | 3047 | rc = cifs_readdata_to_iov(rdata, to); |
1c892549 | 3048 | |
2e8a05d8 PS |
3049 | /* if there was a short read -- discard anything left */ |
3050 | if (rdata->got_bytes && rdata->got_bytes < rdata->bytes) | |
3051 | rc = -ENODATA; | |
1da177e4 | 3052 | } |
1c892549 JL |
3053 | list_del_init(&rdata->list); |
3054 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 3055 | } |
a70307ee | 3056 | |
e6a7bcb4 | 3057 | total_read = len - iov_iter_count(to); |
7f25bba8 | 3058 | |
1c892549 | 3059 | cifs_stats_bytes_read(tcon, total_read); |
1c892549 | 3060 | |
09a4707e PS |
3061 | /* mask nodata case */ |
3062 | if (rc == -ENODATA) | |
3063 | rc = 0; | |
3064 | ||
0165e810 | 3065 | if (total_read) { |
e6a7bcb4 | 3066 | iocb->ki_pos += total_read; |
0165e810 AV |
3067 | return total_read; |
3068 | } | |
3069 | return rc; | |
a70307ee PS |
3070 | } |
3071 | ||
579f9053 | 3072 | ssize_t |
e6a7bcb4 | 3073 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
a70307ee | 3074 | { |
496ad9aa | 3075 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
3076 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3077 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
3078 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
3079 | iocb->ki_filp->private_data; | |
3080 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
3081 | int rc = -EACCES; | |
a70307ee PS |
3082 | |
3083 | /* | |
3084 | * In strict cache mode we need to read from the server all the time | |
3085 | * if we don't have level II oplock because the server can delay mtime | |
3086 | * change - so we can't make a decision about inode invalidating. | |
3087 | * And we can also fail with pagereading if there are mandatory locks | |
3088 | * on pages affected by this read but not on the region from pos to | |
3089 | * pos+len-1. | |
3090 | */ | |
18cceb6a | 3091 | if (!CIFS_CACHE_READ(cinode)) |
e6a7bcb4 | 3092 | return cifs_user_readv(iocb, to); |
a70307ee | 3093 | |
579f9053 PS |
3094 | if (cap_unix(tcon->ses) && |
3095 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
3096 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
e6a7bcb4 | 3097 | return generic_file_read_iter(iocb, to); |
579f9053 PS |
3098 | |
3099 | /* | |
3100 | * We need to hold the sem to be sure nobody modifies lock list | |
3101 | * with a brlock that prevents reading. | |
3102 | */ | |
3103 | down_read(&cinode->lock_sem); | |
e6a7bcb4 | 3104 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
579f9053 | 3105 | tcon->ses->server->vals->shared_lock_type, |
081c0414 | 3106 | NULL, CIFS_READ_OP)) |
e6a7bcb4 | 3107 | rc = generic_file_read_iter(iocb, to); |
579f9053 PS |
3108 | up_read(&cinode->lock_sem); |
3109 | return rc; | |
a70307ee | 3110 | } |
1da177e4 | 3111 | |
f9c6e234 PS |
3112 | static ssize_t |
3113 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
3114 | { |
3115 | int rc = -EACCES; | |
3116 | unsigned int bytes_read = 0; | |
3117 | unsigned int total_read; | |
3118 | unsigned int current_read_size; | |
5eba8ab3 | 3119 | unsigned int rsize; |
1da177e4 | 3120 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 3121 | struct cifs_tcon *tcon; |
f9c6e234 | 3122 | struct TCP_Server_Info *server; |
6d5786a3 | 3123 | unsigned int xid; |
f9c6e234 | 3124 | char *cur_offset; |
1da177e4 | 3125 | struct cifsFileInfo *open_file; |
d4ffff1f | 3126 | struct cifs_io_parms io_parms; |
ec637e3f | 3127 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 3128 | __u32 pid; |
1da177e4 | 3129 | |
6d5786a3 | 3130 | xid = get_xid(); |
7119e220 | 3131 | cifs_sb = CIFS_FILE_SB(file); |
1da177e4 | 3132 | |
5eba8ab3 JL |
3133 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3134 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3135 | ||
1da177e4 | 3136 | if (file->private_data == NULL) { |
0f3bc09e | 3137 | rc = -EBADF; |
6d5786a3 | 3138 | free_xid(xid); |
0f3bc09e | 3139 | return rc; |
1da177e4 | 3140 | } |
c21dfb69 | 3141 | open_file = file->private_data; |
29e20f9c | 3142 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3143 | server = tcon->ses->server; |
3144 | ||
3145 | if (!server->ops->sync_read) { | |
3146 | free_xid(xid); | |
3147 | return -ENOSYS; | |
3148 | } | |
1da177e4 | 3149 | |
d4ffff1f PS |
3150 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3151 | pid = open_file->pid; | |
3152 | else | |
3153 | pid = current->tgid; | |
3154 | ||
1da177e4 | 3155 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3156 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3157 | |
f9c6e234 PS |
3158 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3159 | total_read += bytes_read, cur_offset += bytes_read) { | |
e374d90f PS |
3160 | do { |
3161 | current_read_size = min_t(uint, read_size - total_read, | |
3162 | rsize); | |
3163 | /* | |
3164 | * For windows me and 9x we do not want to request more | |
3165 | * than it negotiated since it will refuse the read | |
3166 | * then. | |
3167 | */ | |
3168 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
29e20f9c | 3169 | tcon->ses->server->vals->cap_large_files)) { |
e374d90f PS |
3170 | current_read_size = min_t(uint, |
3171 | current_read_size, CIFSMaxBufSize); | |
3172 | } | |
cdff08e7 | 3173 | if (open_file->invalidHandle) { |
15886177 | 3174 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3175 | if (rc != 0) |
3176 | break; | |
3177 | } | |
d4ffff1f | 3178 | io_parms.pid = pid; |
29e20f9c | 3179 | io_parms.tcon = tcon; |
f9c6e234 | 3180 | io_parms.offset = *offset; |
d4ffff1f | 3181 | io_parms.length = current_read_size; |
db8b631d | 3182 | rc = server->ops->sync_read(xid, &open_file->fid, &io_parms, |
f9c6e234 PS |
3183 | &bytes_read, &cur_offset, |
3184 | &buf_type); | |
e374d90f PS |
3185 | } while (rc == -EAGAIN); |
3186 | ||
1da177e4 LT |
3187 | if (rc || (bytes_read == 0)) { |
3188 | if (total_read) { | |
3189 | break; | |
3190 | } else { | |
6d5786a3 | 3191 | free_xid(xid); |
1da177e4 LT |
3192 | return rc; |
3193 | } | |
3194 | } else { | |
29e20f9c | 3195 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3196 | *offset += bytes_read; |
1da177e4 LT |
3197 | } |
3198 | } | |
6d5786a3 | 3199 | free_xid(xid); |
1da177e4 LT |
3200 | return total_read; |
3201 | } | |
3202 | ||
ca83ce3d JL |
3203 | /* |
3204 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3205 | * sure that it doesn't change while being written back. | |
3206 | */ | |
3207 | static int | |
3208 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3209 | { | |
3210 | struct page *page = vmf->page; | |
3211 | ||
3212 | lock_page(page); | |
3213 | return VM_FAULT_LOCKED; | |
3214 | } | |
3215 | ||
7cbea8dc | 3216 | static const struct vm_operations_struct cifs_file_vm_ops = { |
ca83ce3d | 3217 | .fault = filemap_fault, |
f1820361 | 3218 | .map_pages = filemap_map_pages, |
ca83ce3d JL |
3219 | .page_mkwrite = cifs_page_mkwrite, |
3220 | }; | |
3221 | ||
7a6a19b1 PS |
3222 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3223 | { | |
3224 | int rc, xid; | |
496ad9aa | 3225 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3226 | |
6d5786a3 | 3227 | xid = get_xid(); |
7a6a19b1 | 3228 | |
18cceb6a | 3229 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 3230 | rc = cifs_zap_mapping(inode); |
6feb9891 PS |
3231 | if (rc) |
3232 | return rc; | |
3233 | } | |
7a6a19b1 PS |
3234 | |
3235 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3236 | if (rc == 0) |
3237 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3238 | free_xid(xid); |
7a6a19b1 PS |
3239 | return rc; |
3240 | } | |
3241 | ||
1da177e4 LT |
3242 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3243 | { | |
1da177e4 LT |
3244 | int rc, xid; |
3245 | ||
6d5786a3 | 3246 | xid = get_xid(); |
abab095d | 3247 | rc = cifs_revalidate_file(file); |
1da177e4 | 3248 | if (rc) { |
f96637be JP |
3249 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3250 | rc); | |
6d5786a3 | 3251 | free_xid(xid); |
1da177e4 LT |
3252 | return rc; |
3253 | } | |
3254 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3255 | if (rc == 0) |
3256 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3257 | free_xid(xid); |
1da177e4 LT |
3258 | return rc; |
3259 | } | |
3260 | ||
0471ca3f JL |
3261 | static void |
3262 | cifs_readv_complete(struct work_struct *work) | |
3263 | { | |
b770ddfa | 3264 | unsigned int i, got_bytes; |
0471ca3f JL |
3265 | struct cifs_readdata *rdata = container_of(work, |
3266 | struct cifs_readdata, work); | |
0471ca3f | 3267 | |
b770ddfa | 3268 | got_bytes = rdata->got_bytes; |
c5fab6f4 JL |
3269 | for (i = 0; i < rdata->nr_pages; i++) { |
3270 | struct page *page = rdata->pages[i]; | |
3271 | ||
0471ca3f JL |
3272 | lru_cache_add_file(page); |
3273 | ||
b770ddfa PS |
3274 | if (rdata->result == 0 || |
3275 | (rdata->result == -EAGAIN && got_bytes)) { | |
0471ca3f JL |
3276 | flush_dcache_page(page); |
3277 | SetPageUptodate(page); | |
3278 | } | |
3279 | ||
3280 | unlock_page(page); | |
3281 | ||
b770ddfa PS |
3282 | if (rdata->result == 0 || |
3283 | (rdata->result == -EAGAIN && got_bytes)) | |
0471ca3f JL |
3284 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
3285 | ||
09cbfeaf | 3286 | got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes); |
b770ddfa | 3287 | |
09cbfeaf | 3288 | put_page(page); |
c5fab6f4 | 3289 | rdata->pages[i] = NULL; |
0471ca3f | 3290 | } |
6993f74a | 3291 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3292 | } |
3293 | ||
8d5ce4d2 | 3294 | static int |
8321fec4 JL |
3295 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3296 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3297 | { |
b3160aeb | 3298 | int result = 0; |
c5fab6f4 | 3299 | unsigned int i; |
8d5ce4d2 JL |
3300 | u64 eof; |
3301 | pgoff_t eof_index; | |
c5fab6f4 | 3302 | unsigned int nr_pages = rdata->nr_pages; |
8d5ce4d2 JL |
3303 | |
3304 | /* determine the eof that the server (probably) has */ | |
3305 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
09cbfeaf | 3306 | eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0; |
f96637be | 3307 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3308 | |
b3160aeb | 3309 | rdata->got_bytes = 0; |
09cbfeaf | 3310 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
3311 | for (i = 0; i < nr_pages; i++) { |
3312 | struct page *page = rdata->pages[i]; | |
442c9ac9 | 3313 | size_t n = PAGE_SIZE; |
c5fab6f4 | 3314 | |
09cbfeaf | 3315 | if (len >= PAGE_SIZE) { |
09cbfeaf | 3316 | len -= PAGE_SIZE; |
8321fec4 | 3317 | } else if (len > 0) { |
8d5ce4d2 | 3318 | /* enough for partial page, fill and zero the rest */ |
442c9ac9 | 3319 | zero_user(page, len, PAGE_SIZE - len); |
71335664 | 3320 | n = rdata->tailsz = len; |
8321fec4 | 3321 | len = 0; |
8d5ce4d2 JL |
3322 | } else if (page->index > eof_index) { |
3323 | /* | |
3324 | * The VFS will not try to do readahead past the | |
3325 | * i_size, but it's possible that we have outstanding | |
3326 | * writes with gaps in the middle and the i_size hasn't | |
3327 | * caught up yet. Populate those with zeroed out pages | |
3328 | * to prevent the VFS from repeatedly attempting to | |
3329 | * fill them until the writes are flushed. | |
3330 | */ | |
09cbfeaf | 3331 | zero_user(page, 0, PAGE_SIZE); |
8d5ce4d2 JL |
3332 | lru_cache_add_file(page); |
3333 | flush_dcache_page(page); | |
3334 | SetPageUptodate(page); | |
3335 | unlock_page(page); | |
09cbfeaf | 3336 | put_page(page); |
c5fab6f4 JL |
3337 | rdata->pages[i] = NULL; |
3338 | rdata->nr_pages--; | |
8321fec4 | 3339 | continue; |
8d5ce4d2 JL |
3340 | } else { |
3341 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3342 | lru_cache_add_file(page); |
3343 | unlock_page(page); | |
09cbfeaf | 3344 | put_page(page); |
c5fab6f4 JL |
3345 | rdata->pages[i] = NULL; |
3346 | rdata->nr_pages--; | |
8321fec4 | 3347 | continue; |
8d5ce4d2 | 3348 | } |
8321fec4 | 3349 | |
71335664 | 3350 | result = cifs_read_page_from_socket(server, page, n); |
8321fec4 JL |
3351 | if (result < 0) |
3352 | break; | |
3353 | ||
b3160aeb | 3354 | rdata->got_bytes += result; |
8d5ce4d2 JL |
3355 | } |
3356 | ||
b3160aeb PS |
3357 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
3358 | rdata->got_bytes : result; | |
8d5ce4d2 JL |
3359 | } |
3360 | ||
387eb92a PS |
3361 | static int |
3362 | readpages_get_pages(struct address_space *mapping, struct list_head *page_list, | |
3363 | unsigned int rsize, struct list_head *tmplist, | |
3364 | unsigned int *nr_pages, loff_t *offset, unsigned int *bytes) | |
3365 | { | |
3366 | struct page *page, *tpage; | |
3367 | unsigned int expected_index; | |
3368 | int rc; | |
c62d2555 | 3369 | gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL); |
387eb92a | 3370 | |
69cebd75 PS |
3371 | INIT_LIST_HEAD(tmplist); |
3372 | ||
387eb92a PS |
3373 | page = list_entry(page_list->prev, struct page, lru); |
3374 | ||
3375 | /* | |
3376 | * Lock the page and put it in the cache. Since no one else | |
3377 | * should have access to this page, we're safe to simply set | |
3378 | * PG_locked without checking it first. | |
3379 | */ | |
48c935ad | 3380 | __SetPageLocked(page); |
387eb92a | 3381 | rc = add_to_page_cache_locked(page, mapping, |
063d99b4 | 3382 | page->index, gfp); |
387eb92a PS |
3383 | |
3384 | /* give up if we can't stick it in the cache */ | |
3385 | if (rc) { | |
48c935ad | 3386 | __ClearPageLocked(page); |
387eb92a PS |
3387 | return rc; |
3388 | } | |
3389 | ||
3390 | /* move first page to the tmplist */ | |
09cbfeaf KS |
3391 | *offset = (loff_t)page->index << PAGE_SHIFT; |
3392 | *bytes = PAGE_SIZE; | |
387eb92a PS |
3393 | *nr_pages = 1; |
3394 | list_move_tail(&page->lru, tmplist); | |
3395 | ||
3396 | /* now try and add more pages onto the request */ | |
3397 | expected_index = page->index + 1; | |
3398 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3399 | /* discontinuity ? */ | |
3400 | if (page->index != expected_index) | |
3401 | break; | |
3402 | ||
3403 | /* would this page push the read over the rsize? */ | |
09cbfeaf | 3404 | if (*bytes + PAGE_SIZE > rsize) |
387eb92a PS |
3405 | break; |
3406 | ||
48c935ad | 3407 | __SetPageLocked(page); |
063d99b4 | 3408 | if (add_to_page_cache_locked(page, mapping, page->index, gfp)) { |
48c935ad | 3409 | __ClearPageLocked(page); |
387eb92a PS |
3410 | break; |
3411 | } | |
3412 | list_move_tail(&page->lru, tmplist); | |
09cbfeaf | 3413 | (*bytes) += PAGE_SIZE; |
387eb92a PS |
3414 | expected_index++; |
3415 | (*nr_pages)++; | |
3416 | } | |
3417 | return rc; | |
8d5ce4d2 JL |
3418 | } |
3419 | ||
1da177e4 LT |
3420 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3421 | struct list_head *page_list, unsigned num_pages) | |
3422 | { | |
690c5e31 JL |
3423 | int rc; |
3424 | struct list_head tmplist; | |
3425 | struct cifsFileInfo *open_file = file->private_data; | |
7119e220 | 3426 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
69cebd75 | 3427 | struct TCP_Server_Info *server; |
690c5e31 | 3428 | pid_t pid; |
1da177e4 | 3429 | |
56698236 SJ |
3430 | /* |
3431 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3432 | * immediately if the cookie is negative | |
54afa990 DH |
3433 | * |
3434 | * After this point, every page in the list might have PG_fscache set, | |
3435 | * so we will need to clean that up off of every page we don't use. | |
56698236 SJ |
3436 | */ |
3437 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3438 | &num_pages); | |
3439 | if (rc == 0) | |
690c5e31 | 3440 | return rc; |
56698236 | 3441 | |
d4ffff1f PS |
3442 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3443 | pid = open_file->pid; | |
3444 | else | |
3445 | pid = current->tgid; | |
3446 | ||
690c5e31 | 3447 | rc = 0; |
69cebd75 | 3448 | server = tlink_tcon(open_file->tlink)->ses->server; |
1da177e4 | 3449 | |
f96637be JP |
3450 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3451 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3452 | |
3453 | /* | |
3454 | * Start with the page at end of list and move it to private | |
3455 | * list. Do the same with any following pages until we hit | |
3456 | * the rsize limit, hit an index discontinuity, or run out of | |
3457 | * pages. Issue the async read and then start the loop again | |
3458 | * until the list is empty. | |
3459 | * | |
3460 | * Note that list order is important. The page_list is in | |
3461 | * the order of declining indexes. When we put the pages in | |
3462 | * the rdata->pages, then we want them in increasing order. | |
3463 | */ | |
3464 | while (!list_empty(page_list)) { | |
bed9da02 | 3465 | unsigned int i, nr_pages, bytes, rsize; |
690c5e31 JL |
3466 | loff_t offset; |
3467 | struct page *page, *tpage; | |
3468 | struct cifs_readdata *rdata; | |
bed9da02 | 3469 | unsigned credits; |
1da177e4 | 3470 | |
bed9da02 PS |
3471 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
3472 | &rsize, &credits); | |
3473 | if (rc) | |
3474 | break; | |
690c5e31 JL |
3475 | |
3476 | /* | |
69cebd75 PS |
3477 | * Give up immediately if rsize is too small to read an entire |
3478 | * page. The VFS will fall back to readpage. We should never | |
3479 | * reach this point however since we set ra_pages to 0 when the | |
3480 | * rsize is smaller than a cache page. | |
690c5e31 | 3481 | */ |
09cbfeaf | 3482 | if (unlikely(rsize < PAGE_SIZE)) { |
bed9da02 | 3483 | add_credits_and_wake_if(server, credits, 0); |
69cebd75 | 3484 | return 0; |
bed9da02 | 3485 | } |
690c5e31 | 3486 | |
bed9da02 PS |
3487 | rc = readpages_get_pages(mapping, page_list, rsize, &tmplist, |
3488 | &nr_pages, &offset, &bytes); | |
690c5e31 | 3489 | if (rc) { |
bed9da02 | 3490 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3491 | break; |
3492 | } | |
3493 | ||
0471ca3f | 3494 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3495 | if (!rdata) { |
3496 | /* best to give up if we're out of mem */ | |
3497 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3498 | list_del(&page->lru); | |
3499 | lru_cache_add_file(page); | |
3500 | unlock_page(page); | |
09cbfeaf | 3501 | put_page(page); |
690c5e31 JL |
3502 | } |
3503 | rc = -ENOMEM; | |
bed9da02 | 3504 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3505 | break; |
3506 | } | |
3507 | ||
6993f74a | 3508 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3509 | rdata->mapping = mapping; |
3510 | rdata->offset = offset; | |
3511 | rdata->bytes = bytes; | |
3512 | rdata->pid = pid; | |
09cbfeaf | 3513 | rdata->pagesz = PAGE_SIZE; |
8321fec4 | 3514 | rdata->read_into_pages = cifs_readpages_read_into_pages; |
bed9da02 | 3515 | rdata->credits = credits; |
c5fab6f4 JL |
3516 | |
3517 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3518 | list_del(&page->lru); | |
3519 | rdata->pages[rdata->nr_pages++] = page; | |
3520 | } | |
690c5e31 | 3521 | |
69cebd75 PS |
3522 | if (!rdata->cfile->invalidHandle || |
3523 | !cifs_reopen_file(rdata->cfile, true)) | |
3524 | rc = server->ops->async_readv(rdata); | |
3525 | if (rc) { | |
bed9da02 | 3526 | add_credits_and_wake_if(server, rdata->credits, 0); |
c5fab6f4 JL |
3527 | for (i = 0; i < rdata->nr_pages; i++) { |
3528 | page = rdata->pages[i]; | |
690c5e31 JL |
3529 | lru_cache_add_file(page); |
3530 | unlock_page(page); | |
09cbfeaf | 3531 | put_page(page); |
1da177e4 | 3532 | } |
1209bbdf | 3533 | /* Fallback to the readpage in error/reconnect cases */ |
6993f74a | 3534 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3535 | break; |
3536 | } | |
6993f74a JL |
3537 | |
3538 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3539 | } |
3540 | ||
54afa990 DH |
3541 | /* Any pages that have been shown to fscache but didn't get added to |
3542 | * the pagecache must be uncached before they get returned to the | |
3543 | * allocator. | |
3544 | */ | |
3545 | cifs_fscache_readpages_cancel(mapping->host, page_list); | |
1da177e4 LT |
3546 | return rc; |
3547 | } | |
3548 | ||
a9e9b7bc SP |
3549 | /* |
3550 | * cifs_readpage_worker must be called with the page pinned | |
3551 | */ | |
1da177e4 LT |
3552 | static int cifs_readpage_worker(struct file *file, struct page *page, |
3553 | loff_t *poffset) | |
3554 | { | |
3555 | char *read_data; | |
3556 | int rc; | |
3557 | ||
56698236 | 3558 | /* Is the page cached? */ |
496ad9aa | 3559 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3560 | if (rc == 0) |
3561 | goto read_complete; | |
3562 | ||
1da177e4 LT |
3563 | read_data = kmap(page); |
3564 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3565 | |
09cbfeaf | 3566 | rc = cifs_read(file, read_data, PAGE_SIZE, poffset); |
fb8c4b14 | 3567 | |
1da177e4 LT |
3568 | if (rc < 0) |
3569 | goto io_error; | |
3570 | else | |
f96637be | 3571 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3572 | |
496ad9aa AV |
3573 | file_inode(file)->i_atime = |
3574 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3575 | |
09cbfeaf KS |
3576 | if (PAGE_SIZE > rc) |
3577 | memset(read_data + rc, 0, PAGE_SIZE - rc); | |
1da177e4 LT |
3578 | |
3579 | flush_dcache_page(page); | |
3580 | SetPageUptodate(page); | |
9dc06558 SJ |
3581 | |
3582 | /* send this page to the cache */ | |
496ad9aa | 3583 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3584 | |
1da177e4 | 3585 | rc = 0; |
fb8c4b14 | 3586 | |
1da177e4 | 3587 | io_error: |
fb8c4b14 | 3588 | kunmap(page); |
466bd31b | 3589 | unlock_page(page); |
56698236 SJ |
3590 | |
3591 | read_complete: | |
1da177e4 LT |
3592 | return rc; |
3593 | } | |
3594 | ||
3595 | static int cifs_readpage(struct file *file, struct page *page) | |
3596 | { | |
09cbfeaf | 3597 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
1da177e4 | 3598 | int rc = -EACCES; |
6d5786a3 | 3599 | unsigned int xid; |
1da177e4 | 3600 | |
6d5786a3 | 3601 | xid = get_xid(); |
1da177e4 LT |
3602 | |
3603 | if (file->private_data == NULL) { | |
0f3bc09e | 3604 | rc = -EBADF; |
6d5786a3 | 3605 | free_xid(xid); |
0f3bc09e | 3606 | return rc; |
1da177e4 LT |
3607 | } |
3608 | ||
f96637be | 3609 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3610 | page, (int)offset, (int)offset); |
1da177e4 LT |
3611 | |
3612 | rc = cifs_readpage_worker(file, page, &offset); | |
3613 | ||
6d5786a3 | 3614 | free_xid(xid); |
1da177e4 LT |
3615 | return rc; |
3616 | } | |
3617 | ||
a403a0a3 SF |
3618 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3619 | { | |
3620 | struct cifsFileInfo *open_file; | |
3621 | ||
4477288a | 3622 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3623 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3624 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3625 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3626 | return 1; |
3627 | } | |
3628 | } | |
4477288a | 3629 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3630 | return 0; |
3631 | } | |
3632 | ||
1da177e4 LT |
3633 | /* We do not want to update the file size from server for inodes |
3634 | open for write - to avoid races with writepage extending | |
3635 | the file - in the future we could consider allowing | |
fb8c4b14 | 3636 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3637 | but this is tricky to do without racing with writebehind |
3638 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3639 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3640 | { |
a403a0a3 | 3641 | if (!cifsInode) |
4b18f2a9 | 3642 | return true; |
50c2f753 | 3643 | |
a403a0a3 SF |
3644 | if (is_inode_writable(cifsInode)) { |
3645 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3646 | struct cifs_sb_info *cifs_sb; |
3647 | ||
c32a0b68 | 3648 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3649 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3650 | /* since no page cache to corrupt on directio |
c32a0b68 | 3651 | we can change size safely */ |
4b18f2a9 | 3652 | return true; |
c32a0b68 SF |
3653 | } |
3654 | ||
fb8c4b14 | 3655 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3656 | return true; |
7ba52631 | 3657 | |
4b18f2a9 | 3658 | return false; |
23e7dd7d | 3659 | } else |
4b18f2a9 | 3660 | return true; |
1da177e4 LT |
3661 | } |
3662 | ||
d9414774 NP |
3663 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3664 | loff_t pos, unsigned len, unsigned flags, | |
3665 | struct page **pagep, void **fsdata) | |
1da177e4 | 3666 | { |
466bd31b | 3667 | int oncethru = 0; |
09cbfeaf KS |
3668 | pgoff_t index = pos >> PAGE_SHIFT; |
3669 | loff_t offset = pos & (PAGE_SIZE - 1); | |
a98ee8c1 JL |
3670 | loff_t page_start = pos & PAGE_MASK; |
3671 | loff_t i_size; | |
3672 | struct page *page; | |
3673 | int rc = 0; | |
d9414774 | 3674 | |
f96637be | 3675 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3676 | |
466bd31b | 3677 | start: |
54566b2c | 3678 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3679 | if (!page) { |
3680 | rc = -ENOMEM; | |
3681 | goto out; | |
3682 | } | |
8a236264 | 3683 | |
a98ee8c1 JL |
3684 | if (PageUptodate(page)) |
3685 | goto out; | |
8a236264 | 3686 | |
a98ee8c1 JL |
3687 | /* |
3688 | * If we write a full page it will be up to date, no need to read from | |
3689 | * the server. If the write is short, we'll end up doing a sync write | |
3690 | * instead. | |
3691 | */ | |
09cbfeaf | 3692 | if (len == PAGE_SIZE) |
a98ee8c1 | 3693 | goto out; |
8a236264 | 3694 | |
a98ee8c1 JL |
3695 | /* |
3696 | * optimize away the read when we have an oplock, and we're not | |
3697 | * expecting to use any of the data we'd be reading in. That | |
3698 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3699 | * and the write will cover all of the existing data. | |
3700 | */ | |
18cceb6a | 3701 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
a98ee8c1 JL |
3702 | i_size = i_size_read(mapping->host); |
3703 | if (page_start >= i_size || | |
3704 | (offset == 0 && (pos + len) >= i_size)) { | |
3705 | zero_user_segments(page, 0, offset, | |
3706 | offset + len, | |
09cbfeaf | 3707 | PAGE_SIZE); |
a98ee8c1 JL |
3708 | /* |
3709 | * PageChecked means that the parts of the page | |
3710 | * to which we're not writing are considered up | |
3711 | * to date. Once the data is copied to the | |
3712 | * page, it can be set uptodate. | |
3713 | */ | |
3714 | SetPageChecked(page); | |
3715 | goto out; | |
3716 | } | |
3717 | } | |
d9414774 | 3718 | |
466bd31b | 3719 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
a98ee8c1 JL |
3720 | /* |
3721 | * might as well read a page, it is fast enough. If we get | |
3722 | * an error, we don't need to return it. cifs_write_end will | |
3723 | * do a sync write instead since PG_uptodate isn't set. | |
3724 | */ | |
3725 | cifs_readpage_worker(file, page, &page_start); | |
09cbfeaf | 3726 | put_page(page); |
466bd31b SP |
3727 | oncethru = 1; |
3728 | goto start; | |
8a236264 SF |
3729 | } else { |
3730 | /* we could try using another file handle if there is one - | |
3731 | but how would we lock it to prevent close of that handle | |
3732 | racing with this read? In any case | |
d9414774 | 3733 | this will be written out by write_end so is fine */ |
1da177e4 | 3734 | } |
a98ee8c1 JL |
3735 | out: |
3736 | *pagep = page; | |
3737 | return rc; | |
1da177e4 LT |
3738 | } |
3739 | ||
85f2d6b4 SJ |
3740 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3741 | { | |
3742 | if (PagePrivate(page)) | |
3743 | return 0; | |
3744 | ||
3745 | return cifs_fscache_release_page(page, gfp); | |
3746 | } | |
3747 | ||
d47992f8 LC |
3748 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
3749 | unsigned int length) | |
85f2d6b4 SJ |
3750 | { |
3751 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3752 | ||
09cbfeaf | 3753 | if (offset == 0 && length == PAGE_SIZE) |
85f2d6b4 SJ |
3754 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
3755 | } | |
3756 | ||
9ad1506b PS |
3757 | static int cifs_launder_page(struct page *page) |
3758 | { | |
3759 | int rc = 0; | |
3760 | loff_t range_start = page_offset(page); | |
09cbfeaf | 3761 | loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); |
9ad1506b PS |
3762 | struct writeback_control wbc = { |
3763 | .sync_mode = WB_SYNC_ALL, | |
3764 | .nr_to_write = 0, | |
3765 | .range_start = range_start, | |
3766 | .range_end = range_end, | |
3767 | }; | |
3768 | ||
f96637be | 3769 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
3770 | |
3771 | if (clear_page_dirty_for_io(page)) | |
3772 | rc = cifs_writepage_locked(page, &wbc); | |
3773 | ||
3774 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3775 | return rc; | |
3776 | } | |
3777 | ||
9b646972 | 3778 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3779 | { |
3780 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3781 | oplock_break); | |
2b0143b5 | 3782 | struct inode *inode = d_inode(cfile->dentry); |
3bc303c2 | 3783 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3784 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
c11f1df5 | 3785 | struct TCP_Server_Info *server = tcon->ses->server; |
eb4b756b | 3786 | int rc = 0; |
3bc303c2 | 3787 | |
c11f1df5 | 3788 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
74316201 | 3789 | TASK_UNINTERRUPTIBLE); |
c11f1df5 SP |
3790 | |
3791 | server->ops->downgrade_oplock(server, cinode, | |
3792 | test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags)); | |
3793 | ||
18cceb6a | 3794 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
63b7d3a4 | 3795 | cifs_has_mand_locks(cinode)) { |
f96637be JP |
3796 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
3797 | inode); | |
18cceb6a | 3798 | cinode->oplock = 0; |
63b7d3a4 PS |
3799 | } |
3800 | ||
3bc303c2 | 3801 | if (inode && S_ISREG(inode->i_mode)) { |
18cceb6a | 3802 | if (CIFS_CACHE_READ(cinode)) |
8737c930 | 3803 | break_lease(inode, O_RDONLY); |
d54ff732 | 3804 | else |
8737c930 | 3805 | break_lease(inode, O_WRONLY); |
3bc303c2 | 3806 | rc = filemap_fdatawrite(inode->i_mapping); |
18cceb6a | 3807 | if (!CIFS_CACHE_READ(cinode)) { |
eb4b756b JL |
3808 | rc = filemap_fdatawait(inode->i_mapping); |
3809 | mapping_set_error(inode->i_mapping, rc); | |
4f73c7d3 | 3810 | cifs_zap_mapping(inode); |
3bc303c2 | 3811 | } |
f96637be | 3812 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
3813 | } |
3814 | ||
85160e03 PS |
3815 | rc = cifs_push_locks(cfile); |
3816 | if (rc) | |
f96637be | 3817 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 3818 | |
3bc303c2 JL |
3819 | /* |
3820 | * releasing stale oplock after recent reconnect of smb session using | |
3821 | * a now incorrect file handle is not a data integrity issue but do | |
3822 | * not bother sending an oplock release if session to server still is | |
3823 | * disconnected since oplock already released by the server | |
3824 | */ | |
cdff08e7 | 3825 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3826 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3827 | cinode); | |
f96637be | 3828 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 3829 | } |
c11f1df5 | 3830 | cifs_done_oplock_break(cinode); |
3bc303c2 JL |
3831 | } |
3832 | ||
dca69288 SF |
3833 | /* |
3834 | * The presence of cifs_direct_io() in the address space ops vector | |
3835 | * allowes open() O_DIRECT flags which would have failed otherwise. | |
3836 | * | |
3837 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests | |
3838 | * so this method should never be called. | |
3839 | * | |
3840 | * Direct IO is not yet supported in the cached mode. | |
3841 | */ | |
3842 | static ssize_t | |
c8b8e32d | 3843 | cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
dca69288 SF |
3844 | { |
3845 | /* | |
3846 | * FIXME | |
3847 | * Eventually need to support direct IO for non forcedirectio mounts | |
3848 | */ | |
3849 | return -EINVAL; | |
3850 | } | |
3851 | ||
3852 | ||
f5e54d6e | 3853 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3854 | .readpage = cifs_readpage, |
3855 | .readpages = cifs_readpages, | |
3856 | .writepage = cifs_writepage, | |
37c0eb46 | 3857 | .writepages = cifs_writepages, |
d9414774 NP |
3858 | .write_begin = cifs_write_begin, |
3859 | .write_end = cifs_write_end, | |
1da177e4 | 3860 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 | 3861 | .releasepage = cifs_release_page, |
dca69288 | 3862 | .direct_IO = cifs_direct_io, |
85f2d6b4 | 3863 | .invalidatepage = cifs_invalidate_page, |
9ad1506b | 3864 | .launder_page = cifs_launder_page, |
1da177e4 | 3865 | }; |
273d81d6 DK |
3866 | |
3867 | /* | |
3868 | * cifs_readpages requires the server to support a buffer large enough to | |
3869 | * contain the header plus one complete page of data. Otherwise, we need | |
3870 | * to leave cifs_readpages out of the address space operations. | |
3871 | */ | |
f5e54d6e | 3872 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3873 | .readpage = cifs_readpage, |
3874 | .writepage = cifs_writepage, | |
3875 | .writepages = cifs_writepages, | |
d9414774 NP |
3876 | .write_begin = cifs_write_begin, |
3877 | .write_end = cifs_write_end, | |
273d81d6 | 3878 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3879 | .releasepage = cifs_release_page, |
3880 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3881 | .launder_page = cifs_launder_page, |
273d81d6 | 3882 | }; |