Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
07b92d0d | 46 | |
1da177e4 LT |
47 | static inline int cifs_convert_flags(unsigned int flags) |
48 | { | |
49 | if ((flags & O_ACCMODE) == O_RDONLY) | |
50 | return GENERIC_READ; | |
51 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
52 | return GENERIC_WRITE; | |
53 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
54 | /* GENERIC_ALL is too much permission to request | |
55 | can cause unnecessary access denied on create */ | |
56 | /* return GENERIC_ALL; */ | |
57 | return (GENERIC_READ | GENERIC_WRITE); | |
58 | } | |
59 | ||
e10f7b55 JL |
60 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
61 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
62 | FILE_READ_DATA); | |
7fc8f4e9 | 63 | } |
e10f7b55 | 64 | |
608712fe | 65 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 66 | { |
608712fe | 67 | u32 posix_flags = 0; |
e10f7b55 | 68 | |
7fc8f4e9 | 69 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 70 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 71 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
72 | posix_flags = SMB_O_WRONLY; |
73 | else if ((flags & O_ACCMODE) == O_RDWR) | |
74 | posix_flags = SMB_O_RDWR; | |
75 | ||
07b92d0d | 76 | if (flags & O_CREAT) { |
608712fe | 77 | posix_flags |= SMB_O_CREAT; |
07b92d0d SF |
78 | if (flags & O_EXCL) |
79 | posix_flags |= SMB_O_EXCL; | |
80 | } else if (flags & O_EXCL) | |
f96637be JP |
81 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
82 | current->comm, current->tgid); | |
07b92d0d | 83 | |
608712fe JL |
84 | if (flags & O_TRUNC) |
85 | posix_flags |= SMB_O_TRUNC; | |
86 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 87 | if (flags & O_DSYNC) |
608712fe | 88 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 89 | if (flags & O_DIRECTORY) |
608712fe | 90 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 91 | if (flags & O_NOFOLLOW) |
608712fe | 92 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 93 | if (flags & O_DIRECT) |
608712fe | 94 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
95 | |
96 | return posix_flags; | |
1da177e4 LT |
97 | } |
98 | ||
99 | static inline int cifs_get_disposition(unsigned int flags) | |
100 | { | |
101 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
102 | return FILE_CREATE; | |
103 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
104 | return FILE_OVERWRITE_IF; | |
105 | else if ((flags & O_CREAT) == O_CREAT) | |
106 | return FILE_OPEN_IF; | |
55aa2e09 SF |
107 | else if ((flags & O_TRUNC) == O_TRUNC) |
108 | return FILE_OVERWRITE; | |
1da177e4 LT |
109 | else |
110 | return FILE_OPEN; | |
111 | } | |
112 | ||
608712fe JL |
113 | int cifs_posix_open(char *full_path, struct inode **pinode, |
114 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 115 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
116 | { |
117 | int rc; | |
118 | FILE_UNIX_BASIC_INFO *presp_data; | |
119 | __u32 posix_flags = 0; | |
120 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
121 | struct cifs_fattr fattr; | |
122 | struct tcon_link *tlink; | |
96daf2b0 | 123 | struct cifs_tcon *tcon; |
608712fe | 124 | |
f96637be | 125 | cifs_dbg(FYI, "posix open %s\n", full_path); |
608712fe JL |
126 | |
127 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
128 | if (presp_data == NULL) | |
129 | return -ENOMEM; | |
130 | ||
131 | tlink = cifs_sb_tlink(cifs_sb); | |
132 | if (IS_ERR(tlink)) { | |
133 | rc = PTR_ERR(tlink); | |
134 | goto posix_open_ret; | |
135 | } | |
136 | ||
137 | tcon = tlink_tcon(tlink); | |
138 | mode &= ~current_umask(); | |
139 | ||
140 | posix_flags = cifs_posix_convert_flags(f_flags); | |
141 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
142 | poplock, full_path, cifs_sb->local_nls, | |
143 | cifs_sb->mnt_cifs_flags & | |
144 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
145 | cifs_put_tlink(tlink); | |
146 | ||
147 | if (rc) | |
148 | goto posix_open_ret; | |
149 | ||
150 | if (presp_data->Type == cpu_to_le32(-1)) | |
151 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
152 | ||
153 | if (!pinode) | |
154 | goto posix_open_ret; /* caller does not need info */ | |
155 | ||
156 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
157 | ||
158 | /* get new inode and set it up */ | |
159 | if (*pinode == NULL) { | |
160 | cifs_fill_uniqueid(sb, &fattr); | |
161 | *pinode = cifs_iget(sb, &fattr); | |
162 | if (!*pinode) { | |
163 | rc = -ENOMEM; | |
164 | goto posix_open_ret; | |
165 | } | |
166 | } else { | |
167 | cifs_fattr_to_inode(*pinode, &fattr); | |
168 | } | |
169 | ||
170 | posix_open_ret: | |
171 | kfree(presp_data); | |
172 | return rc; | |
173 | } | |
174 | ||
eeb910a6 PS |
175 | static int |
176 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
177 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
178 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
179 | { |
180 | int rc; | |
fb1214e4 | 181 | int desired_access; |
eeb910a6 | 182 | int disposition; |
3d3ea8e6 | 183 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 184 | FILE_ALL_INFO *buf; |
b8c32dbb | 185 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 186 | struct cifs_open_parms oparms; |
eeb910a6 | 187 | |
b8c32dbb | 188 | if (!server->ops->open) |
fb1214e4 PS |
189 | return -ENOSYS; |
190 | ||
191 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
192 | |
193 | /********************************************************************* | |
194 | * open flag mapping table: | |
195 | * | |
196 | * POSIX Flag CIFS Disposition | |
197 | * ---------- ---------------- | |
198 | * O_CREAT FILE_OPEN_IF | |
199 | * O_CREAT | O_EXCL FILE_CREATE | |
200 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
201 | * O_TRUNC FILE_OVERWRITE | |
202 | * none of the above FILE_OPEN | |
203 | * | |
204 | * Note that there is not a direct match between disposition | |
205 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
206 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
207 | * file rather than creating a new file as FILE_SUPERSEDE does | |
208 | * (which uses the attributes / metadata passed in on open call) | |
209 | *? | |
210 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
211 | *? and the read write flags match reasonably. O_LARGEFILE | |
212 | *? is irrelevant because largefile support is always used | |
213 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
214 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
215 | *********************************************************************/ | |
216 | ||
217 | disposition = cifs_get_disposition(f_flags); | |
218 | ||
219 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
220 | ||
221 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
222 | if (!buf) | |
223 | return -ENOMEM; | |
224 | ||
3d3ea8e6 SP |
225 | if (backup_cred(cifs_sb)) |
226 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
227 | ||
226730b4 PS |
228 | oparms.tcon = tcon; |
229 | oparms.cifs_sb = cifs_sb; | |
230 | oparms.desired_access = desired_access; | |
231 | oparms.create_options = create_options; | |
232 | oparms.disposition = disposition; | |
233 | oparms.path = full_path; | |
234 | oparms.fid = fid; | |
9cbc0b73 | 235 | oparms.reconnect = false; |
226730b4 PS |
236 | |
237 | rc = server->ops->open(xid, &oparms, oplock, buf); | |
eeb910a6 PS |
238 | |
239 | if (rc) | |
240 | goto out; | |
241 | ||
242 | if (tcon->unix_ext) | |
243 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
244 | xid); | |
245 | else | |
246 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 247 | xid, &fid->netfid); |
eeb910a6 PS |
248 | |
249 | out: | |
250 | kfree(buf); | |
251 | return rc; | |
252 | } | |
253 | ||
63b7d3a4 PS |
254 | static bool |
255 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
256 | { | |
257 | struct cifs_fid_locks *cur; | |
258 | bool has_locks = false; | |
259 | ||
260 | down_read(&cinode->lock_sem); | |
261 | list_for_each_entry(cur, &cinode->llist, llist) { | |
262 | if (!list_empty(&cur->locks)) { | |
263 | has_locks = true; | |
264 | break; | |
265 | } | |
266 | } | |
267 | up_read(&cinode->lock_sem); | |
268 | return has_locks; | |
269 | } | |
270 | ||
15ecb436 | 271 | struct cifsFileInfo * |
fb1214e4 | 272 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
273 | struct tcon_link *tlink, __u32 oplock) |
274 | { | |
275 | struct dentry *dentry = file->f_path.dentry; | |
276 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
277 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
278 | struct cifsFileInfo *cfile; | |
f45d3416 | 279 | struct cifs_fid_locks *fdlocks; |
233839b1 | 280 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 281 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
282 | |
283 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
284 | if (cfile == NULL) | |
285 | return cfile; | |
286 | ||
f45d3416 PS |
287 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
288 | if (!fdlocks) { | |
289 | kfree(cfile); | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | INIT_LIST_HEAD(&fdlocks->locks); | |
294 | fdlocks->cfile = cfile; | |
295 | cfile->llist = fdlocks; | |
1b4b55a1 | 296 | down_write(&cinode->lock_sem); |
f45d3416 | 297 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 298 | up_write(&cinode->lock_sem); |
f45d3416 | 299 | |
4b4de76e | 300 | cfile->count = 1; |
4b4de76e PS |
301 | cfile->pid = current->tgid; |
302 | cfile->uid = current_fsuid(); | |
303 | cfile->dentry = dget(dentry); | |
304 | cfile->f_flags = file->f_flags; | |
305 | cfile->invalidHandle = false; | |
306 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 307 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 308 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 309 | |
24261fc2 MG |
310 | cifs_sb_active(inode->i_sb); |
311 | ||
63b7d3a4 PS |
312 | /* |
313 | * If the server returned a read oplock and we have mandatory brlocks, | |
314 | * set oplock level to None. | |
315 | */ | |
316 | if (oplock == server->vals->oplock_read && | |
317 | cifs_has_mand_locks(cinode)) { | |
f96637be | 318 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
319 | oplock = 0; |
320 | } | |
321 | ||
4477288a | 322 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 323 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
324 | oplock = fid->pending_open->oplock; |
325 | list_del(&fid->pending_open->olist); | |
326 | ||
63b7d3a4 | 327 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
328 | |
329 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
330 | /* if readable file instance put first in list*/ |
331 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 332 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 333 | else |
4b4de76e | 334 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 335 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 336 | |
4b4de76e PS |
337 | file->private_data = cfile; |
338 | return cfile; | |
15ecb436 JL |
339 | } |
340 | ||
764a1b1a JL |
341 | struct cifsFileInfo * |
342 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
343 | { | |
344 | spin_lock(&cifs_file_list_lock); | |
345 | cifsFileInfo_get_locked(cifs_file); | |
346 | spin_unlock(&cifs_file_list_lock); | |
347 | return cifs_file; | |
348 | } | |
349 | ||
cdff08e7 SF |
350 | /* |
351 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
352 | * the filehandle out on the server. Must be called without holding |
353 | * cifs_file_list_lock. | |
cdff08e7 | 354 | */ |
b33879aa JL |
355 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
356 | { | |
e66673e3 | 357 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 358 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 359 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 360 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
361 | struct super_block *sb = inode->i_sb; |
362 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 363 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
364 | struct cifs_fid fid; |
365 | struct cifs_pending_open open; | |
cdff08e7 SF |
366 | |
367 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 368 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
369 | spin_unlock(&cifs_file_list_lock); |
370 | return; | |
371 | } | |
372 | ||
233839b1 PS |
373 | if (server->ops->get_lease_key) |
374 | server->ops->get_lease_key(inode, &fid); | |
375 | ||
376 | /* store open in pending opens to make sure we don't miss lease break */ | |
377 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
378 | ||
cdff08e7 SF |
379 | /* remove it from the lists */ |
380 | list_del(&cifs_file->flist); | |
381 | list_del(&cifs_file->tlist); | |
382 | ||
383 | if (list_empty(&cifsi->openFileList)) { | |
f96637be JP |
384 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
385 | cifs_file->dentry->d_inode); | |
25364138 PS |
386 | /* |
387 | * In strict cache mode we need invalidate mapping on the last | |
388 | * close because it may cause a error when we open this file | |
389 | * again and get at least level II oplock. | |
390 | */ | |
4f8ba8a0 PS |
391 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
392 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 393 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
394 | } |
395 | spin_unlock(&cifs_file_list_lock); | |
396 | ||
ad635942 JL |
397 | cancel_work_sync(&cifs_file->oplock_break); |
398 | ||
cdff08e7 | 399 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 400 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 401 | unsigned int xid; |
0ff78a22 | 402 | |
6d5786a3 | 403 | xid = get_xid(); |
0ff78a22 | 404 | if (server->ops->close) |
760ad0ca PS |
405 | server->ops->close(xid, tcon, &cifs_file->fid); |
406 | _free_xid(xid); | |
cdff08e7 SF |
407 | } |
408 | ||
233839b1 PS |
409 | cifs_del_pending_open(&open); |
410 | ||
f45d3416 PS |
411 | /* |
412 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
413 | * is closed anyway. |
414 | */ | |
1b4b55a1 | 415 | down_write(&cifsi->lock_sem); |
f45d3416 | 416 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 417 | list_del(&li->llist); |
85160e03 | 418 | cifs_del_lock_waiters(li); |
cdff08e7 | 419 | kfree(li); |
b33879aa | 420 | } |
f45d3416 PS |
421 | list_del(&cifs_file->llist->llist); |
422 | kfree(cifs_file->llist); | |
1b4b55a1 | 423 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
424 | |
425 | cifs_put_tlink(cifs_file->tlink); | |
426 | dput(cifs_file->dentry); | |
24261fc2 | 427 | cifs_sb_deactive(sb); |
cdff08e7 | 428 | kfree(cifs_file); |
b33879aa JL |
429 | } |
430 | ||
1da177e4 | 431 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 432 | |
1da177e4 LT |
433 | { |
434 | int rc = -EACCES; | |
6d5786a3 | 435 | unsigned int xid; |
590a3fe0 | 436 | __u32 oplock; |
1da177e4 | 437 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 438 | struct TCP_Server_Info *server; |
96daf2b0 | 439 | struct cifs_tcon *tcon; |
7ffec372 | 440 | struct tcon_link *tlink; |
fb1214e4 | 441 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 442 | char *full_path = NULL; |
7e12eddb | 443 | bool posix_open_ok = false; |
fb1214e4 | 444 | struct cifs_fid fid; |
233839b1 | 445 | struct cifs_pending_open open; |
1da177e4 | 446 | |
6d5786a3 | 447 | xid = get_xid(); |
1da177e4 LT |
448 | |
449 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
450 | tlink = cifs_sb_tlink(cifs_sb); |
451 | if (IS_ERR(tlink)) { | |
6d5786a3 | 452 | free_xid(xid); |
7ffec372 JL |
453 | return PTR_ERR(tlink); |
454 | } | |
455 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 456 | server = tcon->ses->server; |
1da177e4 | 457 | |
e6a00296 | 458 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 459 | if (full_path == NULL) { |
0f3bc09e | 460 | rc = -ENOMEM; |
232341ba | 461 | goto out; |
1da177e4 LT |
462 | } |
463 | ||
f96637be | 464 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 465 | inode, file->f_flags, full_path); |
276a74a4 | 466 | |
233839b1 | 467 | if (server->oplocks) |
276a74a4 SF |
468 | oplock = REQ_OPLOCK; |
469 | else | |
470 | oplock = 0; | |
471 | ||
64cc2c63 | 472 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
473 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
474 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 475 | /* can not refresh inode info since size could be stale */ |
2422f676 | 476 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 477 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 478 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 479 | if (rc == 0) { |
f96637be | 480 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 481 | posix_open_ok = true; |
64cc2c63 SF |
482 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
483 | if (tcon->ses->serverNOS) | |
f96637be JP |
484 | 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", |
485 | tcon->ses->serverName, | |
486 | tcon->ses->serverNOS); | |
64cc2c63 | 487 | tcon->broken_posix_open = true; |
276a74a4 SF |
488 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
489 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
490 | goto out; | |
fb1214e4 PS |
491 | /* |
492 | * Else fallthrough to retry open the old way on network i/o | |
493 | * or DFS errors. | |
494 | */ | |
276a74a4 SF |
495 | } |
496 | ||
233839b1 PS |
497 | if (server->ops->get_lease_key) |
498 | server->ops->get_lease_key(inode, &fid); | |
499 | ||
500 | cifs_add_pending_open(&fid, tlink, &open); | |
501 | ||
7e12eddb | 502 | if (!posix_open_ok) { |
b8c32dbb PS |
503 | if (server->ops->get_lease_key) |
504 | server->ops->get_lease_key(inode, &fid); | |
505 | ||
7e12eddb | 506 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 507 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
508 | if (rc) { |
509 | cifs_del_pending_open(&open); | |
7e12eddb | 510 | goto out; |
233839b1 | 511 | } |
7e12eddb | 512 | } |
47c78b7f | 513 | |
fb1214e4 PS |
514 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
515 | if (cfile == NULL) { | |
b8c32dbb PS |
516 | if (server->ops->close) |
517 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 518 | cifs_del_pending_open(&open); |
1da177e4 LT |
519 | rc = -ENOMEM; |
520 | goto out; | |
521 | } | |
1da177e4 | 522 | |
9451a9a5 SJ |
523 | cifs_fscache_set_inode_cookie(inode, file); |
524 | ||
7e12eddb | 525 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
526 | /* |
527 | * Time to set mode which we can not set earlier due to | |
528 | * problems creating new read-only files. | |
529 | */ | |
7e12eddb PS |
530 | struct cifs_unix_set_info_args args = { |
531 | .mode = inode->i_mode, | |
49418b2c EB |
532 | .uid = INVALID_UID, /* no change */ |
533 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
534 | .ctime = NO_CHANGE_64, |
535 | .atime = NO_CHANGE_64, | |
536 | .mtime = NO_CHANGE_64, | |
537 | .device = 0, | |
538 | }; | |
fb1214e4 PS |
539 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
540 | cfile->pid); | |
1da177e4 LT |
541 | } |
542 | ||
543 | out: | |
1da177e4 | 544 | kfree(full_path); |
6d5786a3 | 545 | free_xid(xid); |
7ffec372 | 546 | cifs_put_tlink(tlink); |
1da177e4 LT |
547 | return rc; |
548 | } | |
549 | ||
f152fd5f PS |
550 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
551 | ||
2ae78ba8 PS |
552 | /* |
553 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 554 | * to server was lost. |
2ae78ba8 | 555 | */ |
f152fd5f PS |
556 | static int |
557 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 558 | { |
f152fd5f PS |
559 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
560 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
561 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
562 | int rc = 0; |
563 | ||
689c3db4 | 564 | down_read(&cinode->lock_sem); |
f152fd5f | 565 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
566 | /* can cache locks - no need to relock */ |
567 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
568 | return rc; |
569 | } | |
570 | ||
571 | if (cap_unix(tcon->ses) && | |
572 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
573 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
574 | rc = cifs_push_posix_locks(cfile); | |
575 | else | |
576 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 577 | |
689c3db4 | 578 | up_read(&cinode->lock_sem); |
1da177e4 LT |
579 | return rc; |
580 | } | |
581 | ||
2ae78ba8 PS |
582 | static int |
583 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
584 | { |
585 | int rc = -EACCES; | |
6d5786a3 | 586 | unsigned int xid; |
590a3fe0 | 587 | __u32 oplock; |
1da177e4 | 588 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 589 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
590 | struct TCP_Server_Info *server; |
591 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 592 | struct inode *inode; |
1da177e4 | 593 | char *full_path = NULL; |
2ae78ba8 | 594 | int desired_access; |
1da177e4 | 595 | int disposition = FILE_OPEN; |
3d3ea8e6 | 596 | int create_options = CREATE_NOT_DIR; |
226730b4 | 597 | struct cifs_open_parms oparms; |
1da177e4 | 598 | |
6d5786a3 | 599 | xid = get_xid(); |
2ae78ba8 PS |
600 | mutex_lock(&cfile->fh_mutex); |
601 | if (!cfile->invalidHandle) { | |
602 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 603 | rc = 0; |
6d5786a3 | 604 | free_xid(xid); |
0f3bc09e | 605 | return rc; |
1da177e4 LT |
606 | } |
607 | ||
2ae78ba8 | 608 | inode = cfile->dentry->d_inode; |
1da177e4 | 609 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
610 | tcon = tlink_tcon(cfile->tlink); |
611 | server = tcon->ses->server; | |
612 | ||
613 | /* | |
614 | * Can not grab rename sem here because various ops, including those | |
615 | * that already have the rename sem can end up causing writepage to get | |
616 | * called and if the server was down that means we end up here, and we | |
617 | * can never tell if the caller already has the rename_sem. | |
618 | */ | |
619 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 620 | if (full_path == NULL) { |
3a9f462f | 621 | rc = -ENOMEM; |
2ae78ba8 | 622 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 623 | free_xid(xid); |
3a9f462f | 624 | return rc; |
1da177e4 LT |
625 | } |
626 | ||
f96637be JP |
627 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
628 | inode, cfile->f_flags, full_path); | |
1da177e4 | 629 | |
10b9b98e | 630 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
631 | oplock = REQ_OPLOCK; |
632 | else | |
4b18f2a9 | 633 | oplock = 0; |
1da177e4 | 634 | |
29e20f9c | 635 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 636 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 637 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
638 | /* |
639 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
640 | * original open. Must mask them off for a reopen. | |
641 | */ | |
2ae78ba8 | 642 | unsigned int oflags = cfile->f_flags & |
15886177 | 643 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 644 | |
2422f676 | 645 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 | 646 | cifs_sb->mnt_file_mode /* ignored */, |
9cbc0b73 | 647 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 648 | if (rc == 0) { |
f96637be | 649 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 650 | oparms.reconnect = true; |
7fc8f4e9 SF |
651 | goto reopen_success; |
652 | } | |
2ae78ba8 PS |
653 | /* |
654 | * fallthrough to retry open the old way on errors, especially | |
655 | * in the reconnect path it is important to retry hard | |
656 | */ | |
7fc8f4e9 SF |
657 | } |
658 | ||
2ae78ba8 | 659 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 660 | |
3d3ea8e6 SP |
661 | if (backup_cred(cifs_sb)) |
662 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
663 | ||
b8c32dbb | 664 | if (server->ops->get_lease_key) |
9cbc0b73 | 665 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 666 | |
226730b4 PS |
667 | oparms.tcon = tcon; |
668 | oparms.cifs_sb = cifs_sb; | |
669 | oparms.desired_access = desired_access; | |
670 | oparms.create_options = create_options; | |
671 | oparms.disposition = disposition; | |
672 | oparms.path = full_path; | |
9cbc0b73 PS |
673 | oparms.fid = &cfile->fid; |
674 | oparms.reconnect = true; | |
226730b4 | 675 | |
2ae78ba8 PS |
676 | /* |
677 | * Can not refresh inode by passing in file_info buf to be returned by | |
678 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
679 | * file might have write behind data that needs to be flushed and server | |
680 | * version of file size can be stale. If we knew for sure that inode was | |
681 | * not dirty locally we could do this. | |
682 | */ | |
226730b4 | 683 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
684 | if (rc == -ENOENT && oparms.reconnect == false) { |
685 | /* durable handle timeout is expired - open the file again */ | |
686 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
687 | /* indicate that we need to relock the file */ | |
688 | oparms.reconnect = true; | |
689 | } | |
690 | ||
1da177e4 | 691 | if (rc) { |
2ae78ba8 | 692 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
693 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
694 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
695 | goto reopen_error_exit; |
696 | } | |
697 | ||
7fc8f4e9 | 698 | reopen_success: |
2ae78ba8 PS |
699 | cfile->invalidHandle = false; |
700 | mutex_unlock(&cfile->fh_mutex); | |
701 | cinode = CIFS_I(inode); | |
15886177 JL |
702 | |
703 | if (can_flush) { | |
704 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 705 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 706 | |
15886177 | 707 | if (tcon->unix_ext) |
2ae78ba8 PS |
708 | rc = cifs_get_inode_info_unix(&inode, full_path, |
709 | inode->i_sb, xid); | |
15886177 | 710 | else |
2ae78ba8 PS |
711 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
712 | inode->i_sb, xid, NULL); | |
713 | } | |
714 | /* | |
715 | * Else we are writing out data to server already and could deadlock if | |
716 | * we tried to flush data, and since we do not know if we have data that | |
717 | * would invalidate the current end of file on the server we can not go | |
718 | * to the server to get the new inode info. | |
719 | */ | |
720 | ||
9cbc0b73 PS |
721 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
722 | if (oparms.reconnect) | |
723 | cifs_relock_file(cfile); | |
15886177 JL |
724 | |
725 | reopen_error_exit: | |
1da177e4 | 726 | kfree(full_path); |
6d5786a3 | 727 | free_xid(xid); |
1da177e4 LT |
728 | return rc; |
729 | } | |
730 | ||
731 | int cifs_close(struct inode *inode, struct file *file) | |
732 | { | |
77970693 JL |
733 | if (file->private_data != NULL) { |
734 | cifsFileInfo_put(file->private_data); | |
735 | file->private_data = NULL; | |
736 | } | |
7ee1af76 | 737 | |
cdff08e7 SF |
738 | /* return code from the ->release op is always ignored */ |
739 | return 0; | |
1da177e4 LT |
740 | } |
741 | ||
742 | int cifs_closedir(struct inode *inode, struct file *file) | |
743 | { | |
744 | int rc = 0; | |
6d5786a3 | 745 | unsigned int xid; |
4b4de76e | 746 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
747 | struct cifs_tcon *tcon; |
748 | struct TCP_Server_Info *server; | |
749 | char *buf; | |
1da177e4 | 750 | |
f96637be | 751 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 752 | |
92fc65a7 PS |
753 | if (cfile == NULL) |
754 | return rc; | |
755 | ||
6d5786a3 | 756 | xid = get_xid(); |
92fc65a7 PS |
757 | tcon = tlink_tcon(cfile->tlink); |
758 | server = tcon->ses->server; | |
1da177e4 | 759 | |
f96637be | 760 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
92fc65a7 PS |
761 | spin_lock(&cifs_file_list_lock); |
762 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
763 | cfile->invalidHandle = true; | |
764 | spin_unlock(&cifs_file_list_lock); | |
765 | if (server->ops->close_dir) | |
766 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
767 | else | |
768 | rc = -ENOSYS; | |
f96637be | 769 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
770 | /* not much we can do if it fails anyway, ignore rc */ |
771 | rc = 0; | |
772 | } else | |
773 | spin_unlock(&cifs_file_list_lock); | |
774 | ||
775 | buf = cfile->srch_inf.ntwrk_buf_start; | |
776 | if (buf) { | |
f96637be | 777 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
778 | cfile->srch_inf.ntwrk_buf_start = NULL; |
779 | if (cfile->srch_inf.smallBuf) | |
780 | cifs_small_buf_release(buf); | |
781 | else | |
782 | cifs_buf_release(buf); | |
1da177e4 | 783 | } |
92fc65a7 PS |
784 | |
785 | cifs_put_tlink(cfile->tlink); | |
786 | kfree(file->private_data); | |
787 | file->private_data = NULL; | |
1da177e4 | 788 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 789 | free_xid(xid); |
1da177e4 LT |
790 | return rc; |
791 | } | |
792 | ||
85160e03 | 793 | static struct cifsLockInfo * |
fbd35aca | 794 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 795 | { |
a88b4707 | 796 | struct cifsLockInfo *lock = |
fb8c4b14 | 797 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
798 | if (!lock) |
799 | return lock; | |
800 | lock->offset = offset; | |
801 | lock->length = length; | |
802 | lock->type = type; | |
a88b4707 PS |
803 | lock->pid = current->tgid; |
804 | INIT_LIST_HEAD(&lock->blist); | |
805 | init_waitqueue_head(&lock->block_q); | |
806 | return lock; | |
85160e03 PS |
807 | } |
808 | ||
f7ba7fe6 | 809 | void |
85160e03 PS |
810 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
811 | { | |
812 | struct cifsLockInfo *li, *tmp; | |
813 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
814 | list_del_init(&li->blist); | |
815 | wake_up(&li->block_q); | |
816 | } | |
817 | } | |
818 | ||
081c0414 PS |
819 | #define CIFS_LOCK_OP 0 |
820 | #define CIFS_READ_OP 1 | |
821 | #define CIFS_WRITE_OP 2 | |
822 | ||
823 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 824 | static bool |
f45d3416 PS |
825 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
826 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 827 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 828 | { |
fbd35aca | 829 | struct cifsLockInfo *li; |
f45d3416 | 830 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 831 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 832 | |
f45d3416 | 833 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
834 | if (offset + length <= li->offset || |
835 | offset >= li->offset + li->length) | |
836 | continue; | |
081c0414 PS |
837 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
838 | server->ops->compare_fids(cfile, cur_cfile)) { | |
839 | /* shared lock prevents write op through the same fid */ | |
840 | if (!(li->type & server->vals->shared_lock_type) || | |
841 | rw_check != CIFS_WRITE_OP) | |
842 | continue; | |
843 | } | |
f45d3416 PS |
844 | if ((type & server->vals->shared_lock_type) && |
845 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
846 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 847 | continue; |
579f9053 PS |
848 | if (conf_lock) |
849 | *conf_lock = li; | |
f45d3416 | 850 | return true; |
85160e03 PS |
851 | } |
852 | return false; | |
853 | } | |
854 | ||
579f9053 | 855 | bool |
55157dfb | 856 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 857 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 858 | int rw_check) |
161ebf9f | 859 | { |
fbd35aca | 860 | bool rc = false; |
f45d3416 | 861 | struct cifs_fid_locks *cur; |
55157dfb | 862 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 863 | |
f45d3416 PS |
864 | list_for_each_entry(cur, &cinode->llist, llist) { |
865 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 866 | cfile, conf_lock, rw_check); |
fbd35aca PS |
867 | if (rc) |
868 | break; | |
869 | } | |
fbd35aca PS |
870 | |
871 | return rc; | |
161ebf9f PS |
872 | } |
873 | ||
9a5101c8 PS |
874 | /* |
875 | * Check if there is another lock that prevents us to set the lock (mandatory | |
876 | * style). If such a lock exists, update the flock structure with its | |
877 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
878 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
879 | * the server or 1 otherwise. | |
880 | */ | |
85160e03 | 881 | static int |
fbd35aca PS |
882 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
883 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
884 | { |
885 | int rc = 0; | |
886 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 887 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 888 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
889 | bool exist; |
890 | ||
1b4b55a1 | 891 | down_read(&cinode->lock_sem); |
85160e03 | 892 | |
55157dfb | 893 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 894 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
895 | if (exist) { |
896 | flock->fl_start = conf_lock->offset; | |
897 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
898 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 899 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
900 | flock->fl_type = F_RDLCK; |
901 | else | |
902 | flock->fl_type = F_WRLCK; | |
903 | } else if (!cinode->can_cache_brlcks) | |
904 | rc = 1; | |
905 | else | |
906 | flock->fl_type = F_UNLCK; | |
907 | ||
1b4b55a1 | 908 | up_read(&cinode->lock_sem); |
85160e03 PS |
909 | return rc; |
910 | } | |
911 | ||
161ebf9f | 912 | static void |
fbd35aca | 913 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 914 | { |
fbd35aca | 915 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 916 | down_write(&cinode->lock_sem); |
f45d3416 | 917 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 918 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
919 | } |
920 | ||
9a5101c8 PS |
921 | /* |
922 | * Set the byte-range lock (mandatory style). Returns: | |
923 | * 1) 0, if we set the lock and don't need to request to the server; | |
924 | * 2) 1, if no locks prevent us but we need to request to the server; | |
925 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
926 | */ | |
85160e03 | 927 | static int |
fbd35aca | 928 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 929 | bool wait) |
85160e03 | 930 | { |
161ebf9f | 931 | struct cifsLockInfo *conf_lock; |
fbd35aca | 932 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
933 | bool exist; |
934 | int rc = 0; | |
935 | ||
85160e03 PS |
936 | try_again: |
937 | exist = false; | |
1b4b55a1 | 938 | down_write(&cinode->lock_sem); |
85160e03 | 939 | |
55157dfb | 940 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 941 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 942 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 943 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 944 | up_write(&cinode->lock_sem); |
85160e03 PS |
945 | return rc; |
946 | } | |
947 | ||
948 | if (!exist) | |
949 | rc = 1; | |
950 | else if (!wait) | |
951 | rc = -EACCES; | |
952 | else { | |
953 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 954 | up_write(&cinode->lock_sem); |
85160e03 PS |
955 | rc = wait_event_interruptible(lock->block_q, |
956 | (lock->blist.prev == &lock->blist) && | |
957 | (lock->blist.next == &lock->blist)); | |
958 | if (!rc) | |
959 | goto try_again; | |
1b4b55a1 | 960 | down_write(&cinode->lock_sem); |
a88b4707 | 961 | list_del_init(&lock->blist); |
85160e03 PS |
962 | } |
963 | ||
1b4b55a1 | 964 | up_write(&cinode->lock_sem); |
85160e03 PS |
965 | return rc; |
966 | } | |
967 | ||
9a5101c8 PS |
968 | /* |
969 | * Check if there is another lock that prevents us to set the lock (posix | |
970 | * style). If such a lock exists, update the flock structure with its | |
971 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
972 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
973 | * the server or 1 otherwise. | |
974 | */ | |
85160e03 | 975 | static int |
4f6bcec9 PS |
976 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
977 | { | |
978 | int rc = 0; | |
496ad9aa | 979 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
980 | unsigned char saved_type = flock->fl_type; |
981 | ||
50792760 PS |
982 | if ((flock->fl_flags & FL_POSIX) == 0) |
983 | return 1; | |
984 | ||
1b4b55a1 | 985 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
986 | posix_test_lock(file, flock); |
987 | ||
988 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
989 | flock->fl_type = saved_type; | |
990 | rc = 1; | |
991 | } | |
992 | ||
1b4b55a1 | 993 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
994 | return rc; |
995 | } | |
996 | ||
9a5101c8 PS |
997 | /* |
998 | * Set the byte-range lock (posix style). Returns: | |
999 | * 1) 0, if we set the lock and don't need to request to the server; | |
1000 | * 2) 1, if we need to request to the server; | |
1001 | * 3) <0, if the error occurs while setting the lock. | |
1002 | */ | |
4f6bcec9 PS |
1003 | static int |
1004 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1005 | { | |
496ad9aa | 1006 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
1007 | int rc = 1; |
1008 | ||
1009 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1010 | return rc; | |
4f6bcec9 | 1011 | |
66189be7 | 1012 | try_again: |
1b4b55a1 | 1013 | down_write(&cinode->lock_sem); |
4f6bcec9 | 1014 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1015 | up_write(&cinode->lock_sem); |
50792760 | 1016 | return rc; |
4f6bcec9 | 1017 | } |
66189be7 PS |
1018 | |
1019 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1020 | up_write(&cinode->lock_sem); |
66189be7 PS |
1021 | if (rc == FILE_LOCK_DEFERRED) { |
1022 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1023 | if (!rc) | |
1024 | goto try_again; | |
1a9e64a7 | 1025 | posix_unblock_lock(flock); |
66189be7 | 1026 | } |
9ebb389d | 1027 | return rc; |
4f6bcec9 PS |
1028 | } |
1029 | ||
d39a4f71 | 1030 | int |
4f6bcec9 | 1031 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1032 | { |
6d5786a3 PS |
1033 | unsigned int xid; |
1034 | int rc = 0, stored_rc; | |
85160e03 PS |
1035 | struct cifsLockInfo *li, *tmp; |
1036 | struct cifs_tcon *tcon; | |
0013fb4c | 1037 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1038 | LOCKING_ANDX_RANGE *buf, *cur; |
1039 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1040 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1041 | int i; | |
85160e03 | 1042 | |
6d5786a3 | 1043 | xid = get_xid(); |
85160e03 PS |
1044 | tcon = tlink_tcon(cfile->tlink); |
1045 | ||
0013fb4c PS |
1046 | /* |
1047 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1048 | * and check it for zero before using. | |
1049 | */ | |
1050 | max_buf = tcon->ses->server->maxBuf; | |
1051 | if (!max_buf) { | |
6d5786a3 | 1052 | free_xid(xid); |
0013fb4c PS |
1053 | return -EINVAL; |
1054 | } | |
1055 | ||
1056 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1057 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1058 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1059 | if (!buf) { | |
6d5786a3 | 1060 | free_xid(xid); |
e2f2886a | 1061 | return -ENOMEM; |
32b9aaf1 PS |
1062 | } |
1063 | ||
1064 | for (i = 0; i < 2; i++) { | |
1065 | cur = buf; | |
1066 | num = 0; | |
f45d3416 | 1067 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1068 | if (li->type != types[i]) |
1069 | continue; | |
1070 | cur->Pid = cpu_to_le16(li->pid); | |
1071 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1072 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1073 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1074 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1075 | if (++num == max_num) { | |
4b4de76e PS |
1076 | stored_rc = cifs_lockv(xid, tcon, |
1077 | cfile->fid.netfid, | |
04a6aa8a PS |
1078 | (__u8)li->type, 0, num, |
1079 | buf); | |
32b9aaf1 PS |
1080 | if (stored_rc) |
1081 | rc = stored_rc; | |
1082 | cur = buf; | |
1083 | num = 0; | |
1084 | } else | |
1085 | cur++; | |
1086 | } | |
1087 | ||
1088 | if (num) { | |
4b4de76e | 1089 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1090 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1091 | if (stored_rc) |
1092 | rc = stored_rc; | |
1093 | } | |
85160e03 PS |
1094 | } |
1095 | ||
32b9aaf1 | 1096 | kfree(buf); |
6d5786a3 | 1097 | free_xid(xid); |
85160e03 PS |
1098 | return rc; |
1099 | } | |
1100 | ||
4f6bcec9 PS |
1101 | /* copied from fs/locks.c with a name change */ |
1102 | #define cifs_for_each_lock(inode, lockp) \ | |
1103 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1104 | lockp = &(*lockp)->fl_next) | |
1105 | ||
d5751469 PS |
1106 | struct lock_to_push { |
1107 | struct list_head llist; | |
1108 | __u64 offset; | |
1109 | __u64 length; | |
1110 | __u32 pid; | |
1111 | __u16 netfid; | |
1112 | __u8 type; | |
1113 | }; | |
1114 | ||
4f6bcec9 | 1115 | static int |
b8db928b | 1116 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1117 | { |
1c8c601a | 1118 | struct inode *inode = cfile->dentry->d_inode; |
4f6bcec9 PS |
1119 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1120 | struct file_lock *flock, **before; | |
d5751469 | 1121 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1122 | int rc = 0, xid, type; |
d5751469 PS |
1123 | struct list_head locks_to_send, *el; |
1124 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1125 | __u64 length; |
4f6bcec9 | 1126 | |
6d5786a3 | 1127 | xid = get_xid(); |
4f6bcec9 | 1128 | |
1c8c601a JL |
1129 | spin_lock(&inode->i_lock); |
1130 | cifs_for_each_lock(inode, before) { | |
d5751469 PS |
1131 | if ((*before)->fl_flags & FL_POSIX) |
1132 | count++; | |
1133 | } | |
1c8c601a | 1134 | spin_unlock(&inode->i_lock); |
d5751469 | 1135 | |
4f6bcec9 PS |
1136 | INIT_LIST_HEAD(&locks_to_send); |
1137 | ||
d5751469 | 1138 | /* |
ce85852b | 1139 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1140 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1141 | * protects locking operations of this inode. |
d5751469 PS |
1142 | */ |
1143 | for (; i < count; i++) { | |
1144 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1145 | if (!lck) { | |
1146 | rc = -ENOMEM; | |
1147 | goto err_out; | |
1148 | } | |
1149 | list_add_tail(&lck->llist, &locks_to_send); | |
1150 | } | |
1151 | ||
d5751469 | 1152 | el = locks_to_send.next; |
1c8c601a JL |
1153 | spin_lock(&inode->i_lock); |
1154 | cifs_for_each_lock(inode, before) { | |
ce85852b PS |
1155 | flock = *before; |
1156 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1157 | continue; | |
d5751469 | 1158 | if (el == &locks_to_send) { |
ce85852b PS |
1159 | /* |
1160 | * The list ended. We don't have enough allocated | |
1161 | * structures - something is really wrong. | |
1162 | */ | |
f96637be | 1163 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1164 | break; |
1165 | } | |
4f6bcec9 PS |
1166 | length = 1 + flock->fl_end - flock->fl_start; |
1167 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1168 | type = CIFS_RDLCK; | |
1169 | else | |
1170 | type = CIFS_WRLCK; | |
d5751469 | 1171 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1172 | lck->pid = flock->fl_pid; |
4b4de76e | 1173 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1174 | lck->length = length; |
1175 | lck->type = type; | |
1176 | lck->offset = flock->fl_start; | |
d5751469 | 1177 | el = el->next; |
4f6bcec9 | 1178 | } |
1c8c601a | 1179 | spin_unlock(&inode->i_lock); |
4f6bcec9 PS |
1180 | |
1181 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1182 | int stored_rc; |
1183 | ||
4f6bcec9 | 1184 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1185 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1186 | lck->type, 0); |
1187 | if (stored_rc) | |
1188 | rc = stored_rc; | |
1189 | list_del(&lck->llist); | |
1190 | kfree(lck); | |
1191 | } | |
1192 | ||
d5751469 | 1193 | out: |
6d5786a3 | 1194 | free_xid(xid); |
4f6bcec9 | 1195 | return rc; |
d5751469 PS |
1196 | err_out: |
1197 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1198 | list_del(&lck->llist); | |
1199 | kfree(lck); | |
1200 | } | |
1201 | goto out; | |
4f6bcec9 PS |
1202 | } |
1203 | ||
9ec3c882 | 1204 | static int |
b8db928b | 1205 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1206 | { |
b8db928b | 1207 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1208 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1209 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1210 | int rc = 0; |
1211 | ||
1212 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1213 | down_write(&cinode->lock_sem); | |
1214 | if (!cinode->can_cache_brlcks) { | |
1215 | up_write(&cinode->lock_sem); | |
1216 | return rc; | |
1217 | } | |
4f6bcec9 | 1218 | |
29e20f9c | 1219 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1220 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1221 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1222 | rc = cifs_push_posix_locks(cfile); |
1223 | else | |
1224 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1225 | |
b8db928b PS |
1226 | cinode->can_cache_brlcks = false; |
1227 | up_write(&cinode->lock_sem); | |
1228 | return rc; | |
4f6bcec9 PS |
1229 | } |
1230 | ||
03776f45 | 1231 | static void |
04a6aa8a | 1232 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1233 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1234 | { |
03776f45 | 1235 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1236 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1237 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1238 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1239 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1240 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1241 | *wait_flag = true; |
1da177e4 | 1242 | } |
03776f45 | 1243 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1244 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1245 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1246 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1247 | if (flock->fl_flags & |
3d6d854a JL |
1248 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1249 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1250 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1251 | |
106dc538 | 1252 | *type = server->vals->large_lock_type; |
03776f45 | 1253 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1254 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1255 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1256 | *lock = 1; |
1257 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1258 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1259 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1260 | *unlock = 1; |
1261 | /* Check if unlock includes more than one lock range */ | |
1262 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1263 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1264 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1265 | *lock = 1; |
1266 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1267 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1268 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1269 | *lock = 1; |
1270 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1271 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1272 | *type |= server->vals->shared_lock_type; |
03776f45 | 1273 | *lock = 1; |
1da177e4 | 1274 | } else |
f96637be | 1275 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1276 | } |
1da177e4 | 1277 | |
03776f45 | 1278 | static int |
04a6aa8a | 1279 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1280 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1281 | { |
1282 | int rc = 0; | |
1283 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1284 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1285 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1286 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1287 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1288 | |
03776f45 PS |
1289 | if (posix_lck) { |
1290 | int posix_lock_type; | |
4f6bcec9 PS |
1291 | |
1292 | rc = cifs_posix_lock_test(file, flock); | |
1293 | if (!rc) | |
1294 | return rc; | |
1295 | ||
106dc538 | 1296 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1297 | posix_lock_type = CIFS_RDLCK; |
1298 | else | |
1299 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1300 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1301 | flock->fl_start, length, flock, |
4f6bcec9 | 1302 | posix_lock_type, wait_flag); |
03776f45 PS |
1303 | return rc; |
1304 | } | |
1da177e4 | 1305 | |
fbd35aca | 1306 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1307 | if (!rc) |
1308 | return rc; | |
1309 | ||
03776f45 | 1310 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1311 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1312 | 1, 0, false); | |
03776f45 | 1313 | if (rc == 0) { |
d39a4f71 PS |
1314 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1315 | type, 0, 1, false); | |
03776f45 PS |
1316 | flock->fl_type = F_UNLCK; |
1317 | if (rc != 0) | |
f96637be JP |
1318 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1319 | rc); | |
a88b4707 | 1320 | return 0; |
1da177e4 | 1321 | } |
7ee1af76 | 1322 | |
106dc538 | 1323 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1324 | flock->fl_type = F_WRLCK; |
a88b4707 | 1325 | return 0; |
7ee1af76 JA |
1326 | } |
1327 | ||
d39a4f71 PS |
1328 | type &= ~server->vals->exclusive_lock_type; |
1329 | ||
1330 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1331 | type | server->vals->shared_lock_type, | |
1332 | 1, 0, false); | |
03776f45 | 1333 | if (rc == 0) { |
d39a4f71 PS |
1334 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1335 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1336 | flock->fl_type = F_RDLCK; |
1337 | if (rc != 0) | |
f96637be JP |
1338 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1339 | rc); | |
03776f45 PS |
1340 | } else |
1341 | flock->fl_type = F_WRLCK; | |
1342 | ||
a88b4707 | 1343 | return 0; |
03776f45 PS |
1344 | } |
1345 | ||
f7ba7fe6 | 1346 | void |
9ee305b7 PS |
1347 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1348 | { | |
1349 | struct list_head *li, *tmp; | |
1350 | list_for_each_safe(li, tmp, source) | |
1351 | list_move(li, dest); | |
1352 | } | |
1353 | ||
f7ba7fe6 | 1354 | void |
9ee305b7 PS |
1355 | cifs_free_llist(struct list_head *llist) |
1356 | { | |
1357 | struct cifsLockInfo *li, *tmp; | |
1358 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1359 | cifs_del_lock_waiters(li); | |
1360 | list_del(&li->llist); | |
1361 | kfree(li); | |
1362 | } | |
1363 | } | |
1364 | ||
d39a4f71 | 1365 | int |
6d5786a3 PS |
1366 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1367 | unsigned int xid) | |
9ee305b7 PS |
1368 | { |
1369 | int rc = 0, stored_rc; | |
1370 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1371 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1372 | unsigned int i; | |
0013fb4c | 1373 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1374 | LOCKING_ANDX_RANGE *buf, *cur; |
1375 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1376 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1377 | struct cifsLockInfo *li, *tmp; | |
1378 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1379 | struct list_head tmp_llist; | |
1380 | ||
1381 | INIT_LIST_HEAD(&tmp_llist); | |
1382 | ||
0013fb4c PS |
1383 | /* |
1384 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1385 | * and check it for zero before using. | |
1386 | */ | |
1387 | max_buf = tcon->ses->server->maxBuf; | |
1388 | if (!max_buf) | |
1389 | return -EINVAL; | |
1390 | ||
1391 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1392 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1393 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1394 | if (!buf) | |
1395 | return -ENOMEM; | |
1396 | ||
1b4b55a1 | 1397 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1398 | for (i = 0; i < 2; i++) { |
1399 | cur = buf; | |
1400 | num = 0; | |
f45d3416 | 1401 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1402 | if (flock->fl_start > li->offset || |
1403 | (flock->fl_start + length) < | |
1404 | (li->offset + li->length)) | |
1405 | continue; | |
1406 | if (current->tgid != li->pid) | |
1407 | continue; | |
9ee305b7 PS |
1408 | if (types[i] != li->type) |
1409 | continue; | |
ea319d57 | 1410 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1411 | /* |
1412 | * We can cache brlock requests - simply remove | |
fbd35aca | 1413 | * a lock from the file's list. |
9ee305b7 PS |
1414 | */ |
1415 | list_del(&li->llist); | |
1416 | cifs_del_lock_waiters(li); | |
1417 | kfree(li); | |
ea319d57 | 1418 | continue; |
9ee305b7 | 1419 | } |
ea319d57 PS |
1420 | cur->Pid = cpu_to_le16(li->pid); |
1421 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1422 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1423 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1424 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1425 | /* | |
1426 | * We need to save a lock here to let us add it again to | |
1427 | * the file's list if the unlock range request fails on | |
1428 | * the server. | |
1429 | */ | |
1430 | list_move(&li->llist, &tmp_llist); | |
1431 | if (++num == max_num) { | |
4b4de76e PS |
1432 | stored_rc = cifs_lockv(xid, tcon, |
1433 | cfile->fid.netfid, | |
ea319d57 PS |
1434 | li->type, num, 0, buf); |
1435 | if (stored_rc) { | |
1436 | /* | |
1437 | * We failed on the unlock range | |
1438 | * request - add all locks from the tmp | |
1439 | * list to the head of the file's list. | |
1440 | */ | |
1441 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1442 | &cfile->llist->locks); |
ea319d57 PS |
1443 | rc = stored_rc; |
1444 | } else | |
1445 | /* | |
1446 | * The unlock range request succeed - | |
1447 | * free the tmp list. | |
1448 | */ | |
1449 | cifs_free_llist(&tmp_llist); | |
1450 | cur = buf; | |
1451 | num = 0; | |
1452 | } else | |
1453 | cur++; | |
9ee305b7 PS |
1454 | } |
1455 | if (num) { | |
4b4de76e | 1456 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1457 | types[i], num, 0, buf); |
1458 | if (stored_rc) { | |
f45d3416 PS |
1459 | cifs_move_llist(&tmp_llist, |
1460 | &cfile->llist->locks); | |
9ee305b7 PS |
1461 | rc = stored_rc; |
1462 | } else | |
1463 | cifs_free_llist(&tmp_llist); | |
1464 | } | |
1465 | } | |
1466 | ||
1b4b55a1 | 1467 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1468 | kfree(buf); |
1469 | return rc; | |
1470 | } | |
1471 | ||
03776f45 | 1472 | static int |
f45d3416 | 1473 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1474 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1475 | unsigned int xid) | |
03776f45 PS |
1476 | { |
1477 | int rc = 0; | |
1478 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1479 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1480 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1481 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1482 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1483 | |
1484 | if (posix_lck) { | |
08547b03 | 1485 | int posix_lock_type; |
4f6bcec9 PS |
1486 | |
1487 | rc = cifs_posix_lock_set(file, flock); | |
1488 | if (!rc || rc < 0) | |
1489 | return rc; | |
1490 | ||
106dc538 | 1491 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1492 | posix_lock_type = CIFS_RDLCK; |
1493 | else | |
1494 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1495 | |
03776f45 | 1496 | if (unlock == 1) |
beb84dc8 | 1497 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1498 | |
f45d3416 PS |
1499 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1500 | current->tgid, flock->fl_start, length, | |
1501 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1502 | goto out; |
1503 | } | |
7ee1af76 | 1504 | |
03776f45 | 1505 | if (lock) { |
161ebf9f PS |
1506 | struct cifsLockInfo *lock; |
1507 | ||
fbd35aca | 1508 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1509 | if (!lock) |
1510 | return -ENOMEM; | |
1511 | ||
fbd35aca | 1512 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1513 | if (rc < 0) { |
161ebf9f | 1514 | kfree(lock); |
21cb2d90 PS |
1515 | return rc; |
1516 | } | |
1517 | if (!rc) | |
85160e03 PS |
1518 | goto out; |
1519 | ||
63b7d3a4 PS |
1520 | /* |
1521 | * Windows 7 server can delay breaking lease from read to None | |
1522 | * if we set a byte-range lock on a file - break it explicitly | |
1523 | * before sending the lock to the server to be sure the next | |
1524 | * read won't conflict with non-overlapted locks due to | |
1525 | * pagereading. | |
1526 | */ | |
1527 | if (!CIFS_I(inode)->clientCanCacheAll && | |
1528 | CIFS_I(inode)->clientCanCacheRead) { | |
1529 | cifs_invalidate_mapping(inode); | |
f96637be JP |
1530 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1531 | inode); | |
63b7d3a4 PS |
1532 | CIFS_I(inode)->clientCanCacheRead = false; |
1533 | } | |
1534 | ||
d39a4f71 PS |
1535 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1536 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1537 | if (rc) { |
1538 | kfree(lock); | |
21cb2d90 | 1539 | return rc; |
03776f45 | 1540 | } |
161ebf9f | 1541 | |
fbd35aca | 1542 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1543 | } else if (unlock) |
d39a4f71 | 1544 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1545 | |
03776f45 PS |
1546 | out: |
1547 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1548 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1549 | return rc; |
1550 | } | |
1551 | ||
1552 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1553 | { | |
1554 | int rc, xid; | |
1555 | int lock = 0, unlock = 0; | |
1556 | bool wait_flag = false; | |
1557 | bool posix_lck = false; | |
1558 | struct cifs_sb_info *cifs_sb; | |
1559 | struct cifs_tcon *tcon; | |
1560 | struct cifsInodeInfo *cinode; | |
1561 | struct cifsFileInfo *cfile; | |
1562 | __u16 netfid; | |
04a6aa8a | 1563 | __u32 type; |
03776f45 PS |
1564 | |
1565 | rc = -EACCES; | |
6d5786a3 | 1566 | xid = get_xid(); |
03776f45 | 1567 | |
f96637be JP |
1568 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1569 | cmd, flock->fl_flags, flock->fl_type, | |
1570 | flock->fl_start, flock->fl_end); | |
03776f45 | 1571 | |
03776f45 PS |
1572 | cfile = (struct cifsFileInfo *)file->private_data; |
1573 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1574 | |
1575 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1576 | tcon->ses->server); | |
1577 | ||
1578 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1579 | netfid = cfile->fid.netfid; |
496ad9aa | 1580 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1581 | |
29e20f9c | 1582 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1583 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1584 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1585 | posix_lck = true; | |
1586 | /* | |
1587 | * BB add code here to normalize offset and length to account for | |
1588 | * negative length which we can not accept over the wire. | |
1589 | */ | |
1590 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1591 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1592 | free_xid(xid); |
03776f45 PS |
1593 | return rc; |
1594 | } | |
1595 | ||
1596 | if (!lock && !unlock) { | |
1597 | /* | |
1598 | * if no lock or unlock then nothing to do since we do not | |
1599 | * know what it is | |
1600 | */ | |
6d5786a3 | 1601 | free_xid(xid); |
03776f45 | 1602 | return -EOPNOTSUPP; |
7ee1af76 JA |
1603 | } |
1604 | ||
03776f45 PS |
1605 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1606 | xid); | |
6d5786a3 | 1607 | free_xid(xid); |
1da177e4 LT |
1608 | return rc; |
1609 | } | |
1610 | ||
597b027f JL |
1611 | /* |
1612 | * update the file size (if needed) after a write. Should be called with | |
1613 | * the inode->i_lock held | |
1614 | */ | |
72432ffc | 1615 | void |
fbec9ab9 JL |
1616 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1617 | unsigned int bytes_written) | |
1618 | { | |
1619 | loff_t end_of_write = offset + bytes_written; | |
1620 | ||
1621 | if (end_of_write > cifsi->server_eof) | |
1622 | cifsi->server_eof = end_of_write; | |
1623 | } | |
1624 | ||
ba9ad725 PS |
1625 | static ssize_t |
1626 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1627 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1628 | { |
1629 | int rc = 0; | |
1630 | unsigned int bytes_written = 0; | |
1631 | unsigned int total_written; | |
1632 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1633 | struct cifs_tcon *tcon; |
1634 | struct TCP_Server_Info *server; | |
6d5786a3 | 1635 | unsigned int xid; |
7da4b49a JL |
1636 | struct dentry *dentry = open_file->dentry; |
1637 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1638 | struct cifs_io_parms io_parms; |
1da177e4 | 1639 | |
7da4b49a | 1640 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1641 | |
f96637be JP |
1642 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n", |
1643 | write_size, *offset, dentry->d_name.name); | |
1da177e4 | 1644 | |
ba9ad725 PS |
1645 | tcon = tlink_tcon(open_file->tlink); |
1646 | server = tcon->ses->server; | |
1647 | ||
1648 | if (!server->ops->sync_write) | |
1649 | return -ENOSYS; | |
50c2f753 | 1650 | |
6d5786a3 | 1651 | xid = get_xid(); |
1da177e4 | 1652 | |
1da177e4 LT |
1653 | for (total_written = 0; write_size > total_written; |
1654 | total_written += bytes_written) { | |
1655 | rc = -EAGAIN; | |
1656 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1657 | struct kvec iov[2]; |
1658 | unsigned int len; | |
1659 | ||
1da177e4 | 1660 | if (open_file->invalidHandle) { |
1da177e4 LT |
1661 | /* we could deadlock if we called |
1662 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1663 | reopen_file not to flush data to |
1da177e4 | 1664 | server now */ |
15886177 | 1665 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1666 | if (rc != 0) |
1667 | break; | |
1668 | } | |
ca83ce3d JL |
1669 | |
1670 | len = min((size_t)cifs_sb->wsize, | |
1671 | write_size - total_written); | |
1672 | /* iov[0] is reserved for smb header */ | |
1673 | iov[1].iov_base = (char *)write_data + total_written; | |
1674 | iov[1].iov_len = len; | |
fa2989f4 | 1675 | io_parms.pid = pid; |
ba9ad725 PS |
1676 | io_parms.tcon = tcon; |
1677 | io_parms.offset = *offset; | |
fa2989f4 | 1678 | io_parms.length = len; |
ba9ad725 PS |
1679 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1680 | &bytes_written, iov, 1); | |
1da177e4 LT |
1681 | } |
1682 | if (rc || (bytes_written == 0)) { | |
1683 | if (total_written) | |
1684 | break; | |
1685 | else { | |
6d5786a3 | 1686 | free_xid(xid); |
1da177e4 LT |
1687 | return rc; |
1688 | } | |
fbec9ab9 | 1689 | } else { |
597b027f | 1690 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1691 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1692 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1693 | *offset += bytes_written; |
fbec9ab9 | 1694 | } |
1da177e4 LT |
1695 | } |
1696 | ||
ba9ad725 | 1697 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1698 | |
7da4b49a JL |
1699 | if (total_written > 0) { |
1700 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1701 | if (*offset > dentry->d_inode->i_size) |
1702 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1703 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1704 | } |
7da4b49a | 1705 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1706 | free_xid(xid); |
1da177e4 LT |
1707 | return total_written; |
1708 | } | |
1709 | ||
6508d904 JL |
1710 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1711 | bool fsuid_only) | |
630f3f0c SF |
1712 | { |
1713 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1714 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1715 | ||
1716 | /* only filter by fsuid on multiuser mounts */ | |
1717 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1718 | fsuid_only = false; | |
630f3f0c | 1719 | |
4477288a | 1720 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1721 | /* we could simply get the first_list_entry since write-only entries |
1722 | are always at the end of the list but since the first entry might | |
1723 | have a close pending, we go through the whole list */ | |
1724 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1725 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1726 | continue; |
2e396b83 | 1727 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1728 | if (!open_file->invalidHandle) { |
1729 | /* found a good file */ | |
1730 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1731 | cifsFileInfo_get_locked(open_file); |
4477288a | 1732 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1733 | return open_file; |
1734 | } /* else might as well continue, and look for | |
1735 | another, or simply have the caller reopen it | |
1736 | again rather than trying to fix this handle */ | |
1737 | } else /* write only file */ | |
1738 | break; /* write only files are last so must be done */ | |
1739 | } | |
4477288a | 1740 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1741 | return NULL; |
1742 | } | |
630f3f0c | 1743 | |
6508d904 JL |
1744 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1745 | bool fsuid_only) | |
6148a742 | 1746 | { |
2c0c2a08 | 1747 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1748 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1749 | bool any_available = false; |
dd99cd80 | 1750 | int rc; |
2c0c2a08 | 1751 | unsigned int refind = 0; |
6148a742 | 1752 | |
60808233 SF |
1753 | /* Having a null inode here (because mapping->host was set to zero by |
1754 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1755 | it being zero) during stress testcases so we need to check for it */ | |
1756 | ||
fb8c4b14 | 1757 | if (cifs_inode == NULL) { |
f96637be | 1758 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1759 | dump_stack(); |
1760 | return NULL; | |
1761 | } | |
1762 | ||
d3892294 JL |
1763 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1764 | ||
6508d904 JL |
1765 | /* only filter by fsuid on multiuser mounts */ |
1766 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1767 | fsuid_only = false; | |
1768 | ||
4477288a | 1769 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1770 | refind_writable: |
2c0c2a08 SP |
1771 | if (refind > MAX_REOPEN_ATT) { |
1772 | spin_unlock(&cifs_file_list_lock); | |
1773 | return NULL; | |
1774 | } | |
6148a742 | 1775 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1776 | if (!any_available && open_file->pid != current->tgid) |
1777 | continue; | |
fef59fd7 | 1778 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1779 | continue; |
2e396b83 | 1780 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1781 | if (!open_file->invalidHandle) { |
1782 | /* found a good writable file */ | |
764a1b1a | 1783 | cifsFileInfo_get_locked(open_file); |
4477288a | 1784 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1785 | return open_file; |
2c0c2a08 SP |
1786 | } else { |
1787 | if (!inv_file) | |
1788 | inv_file = open_file; | |
9b22b0b7 | 1789 | } |
6148a742 SF |
1790 | } |
1791 | } | |
2846d386 JL |
1792 | /* couldn't find useable FH with same pid, try any available */ |
1793 | if (!any_available) { | |
1794 | any_available = true; | |
1795 | goto refind_writable; | |
1796 | } | |
2c0c2a08 SP |
1797 | |
1798 | if (inv_file) { | |
1799 | any_available = false; | |
764a1b1a | 1800 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1801 | } |
1802 | ||
4477288a | 1803 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1804 | |
1805 | if (inv_file) { | |
1806 | rc = cifs_reopen_file(inv_file, false); | |
1807 | if (!rc) | |
1808 | return inv_file; | |
1809 | else { | |
1810 | spin_lock(&cifs_file_list_lock); | |
1811 | list_move_tail(&inv_file->flist, | |
1812 | &cifs_inode->openFileList); | |
1813 | spin_unlock(&cifs_file_list_lock); | |
1814 | cifsFileInfo_put(inv_file); | |
1815 | spin_lock(&cifs_file_list_lock); | |
1816 | ++refind; | |
1817 | goto refind_writable; | |
1818 | } | |
1819 | } | |
1820 | ||
6148a742 SF |
1821 | return NULL; |
1822 | } | |
1823 | ||
1da177e4 LT |
1824 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1825 | { | |
1826 | struct address_space *mapping = page->mapping; | |
1827 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1828 | char *write_data; | |
1829 | int rc = -EFAULT; | |
1830 | int bytes_written = 0; | |
1da177e4 | 1831 | struct inode *inode; |
6148a742 | 1832 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1833 | |
1834 | if (!mapping || !mapping->host) | |
1835 | return -EFAULT; | |
1836 | ||
1837 | inode = page->mapping->host; | |
1da177e4 LT |
1838 | |
1839 | offset += (loff_t)from; | |
1840 | write_data = kmap(page); | |
1841 | write_data += from; | |
1842 | ||
1843 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1844 | kunmap(page); | |
1845 | return -EIO; | |
1846 | } | |
1847 | ||
1848 | /* racing with truncate? */ | |
1849 | if (offset > mapping->host->i_size) { | |
1850 | kunmap(page); | |
1851 | return 0; /* don't care */ | |
1852 | } | |
1853 | ||
1854 | /* check to make sure that we are not extending the file */ | |
1855 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1856 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1857 | |
6508d904 | 1858 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1859 | if (open_file) { |
fa2989f4 PS |
1860 | bytes_written = cifs_write(open_file, open_file->pid, |
1861 | write_data, to - from, &offset); | |
6ab409b5 | 1862 | cifsFileInfo_put(open_file); |
1da177e4 | 1863 | /* Does mm or vfs already set times? */ |
6148a742 | 1864 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1865 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1866 | rc = 0; |
bb5a9a04 SF |
1867 | else if (bytes_written < 0) |
1868 | rc = bytes_written; | |
6148a742 | 1869 | } else { |
f96637be | 1870 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1871 | rc = -EIO; |
1872 | } | |
1873 | ||
1874 | kunmap(page); | |
1875 | return rc; | |
1876 | } | |
1877 | ||
1da177e4 | 1878 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1879 | struct writeback_control *wbc) |
1da177e4 | 1880 | { |
c3d17b63 JL |
1881 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1882 | bool done = false, scanned = false, range_whole = false; | |
1883 | pgoff_t end, index; | |
1884 | struct cifs_writedata *wdata; | |
c9de5c80 | 1885 | struct TCP_Server_Info *server; |
37c0eb46 | 1886 | struct page *page; |
37c0eb46 | 1887 | int rc = 0; |
50c2f753 | 1888 | |
37c0eb46 | 1889 | /* |
c3d17b63 | 1890 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1891 | * one page at a time via cifs_writepage |
1892 | */ | |
1893 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1894 | return generic_writepages(mapping, wbc); | |
1895 | ||
111ebb6e | 1896 | if (wbc->range_cyclic) { |
37c0eb46 | 1897 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1898 | end = -1; |
1899 | } else { | |
1900 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1901 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1902 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1903 | range_whole = true; |
1904 | scanned = true; | |
37c0eb46 SF |
1905 | } |
1906 | retry: | |
c3d17b63 JL |
1907 | while (!done && index <= end) { |
1908 | unsigned int i, nr_pages, found_pages; | |
1909 | pgoff_t next = 0, tofind; | |
1910 | struct page **pages; | |
1911 | ||
1912 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1913 | end - index) + 1; | |
1914 | ||
c2e87640 JL |
1915 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1916 | cifs_writev_complete); | |
c3d17b63 JL |
1917 | if (!wdata) { |
1918 | rc = -ENOMEM; | |
1919 | break; | |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * find_get_pages_tag seems to return a max of 256 on each | |
1924 | * iteration, so we must call it several times in order to | |
1925 | * fill the array or the wsize is effectively limited to | |
1926 | * 256 * PAGE_CACHE_SIZE. | |
1927 | */ | |
1928 | found_pages = 0; | |
1929 | pages = wdata->pages; | |
1930 | do { | |
1931 | nr_pages = find_get_pages_tag(mapping, &index, | |
1932 | PAGECACHE_TAG_DIRTY, | |
1933 | tofind, pages); | |
1934 | found_pages += nr_pages; | |
1935 | tofind -= nr_pages; | |
1936 | pages += nr_pages; | |
1937 | } while (nr_pages && tofind && index <= end); | |
1938 | ||
1939 | if (found_pages == 0) { | |
1940 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1941 | break; | |
1942 | } | |
1943 | ||
1944 | nr_pages = 0; | |
1945 | for (i = 0; i < found_pages; i++) { | |
1946 | page = wdata->pages[i]; | |
37c0eb46 SF |
1947 | /* |
1948 | * At this point we hold neither mapping->tree_lock nor | |
1949 | * lock on the page itself: the page may be truncated or | |
1950 | * invalidated (changing page->mapping to NULL), or even | |
1951 | * swizzled back from swapper_space to tmpfs file | |
1952 | * mapping | |
1953 | */ | |
1954 | ||
c3d17b63 | 1955 | if (nr_pages == 0) |
37c0eb46 | 1956 | lock_page(page); |
529ae9aa | 1957 | else if (!trylock_page(page)) |
37c0eb46 SF |
1958 | break; |
1959 | ||
1960 | if (unlikely(page->mapping != mapping)) { | |
1961 | unlock_page(page); | |
1962 | break; | |
1963 | } | |
1964 | ||
111ebb6e | 1965 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1966 | done = true; |
37c0eb46 SF |
1967 | unlock_page(page); |
1968 | break; | |
1969 | } | |
1970 | ||
1971 | if (next && (page->index != next)) { | |
1972 | /* Not next consecutive page */ | |
1973 | unlock_page(page); | |
1974 | break; | |
1975 | } | |
1976 | ||
1977 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1978 | wait_on_page_writeback(page); | |
1979 | ||
1980 | if (PageWriteback(page) || | |
cb876f45 | 1981 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1982 | unlock_page(page); |
1983 | break; | |
1984 | } | |
84d2f07e | 1985 | |
cb876f45 LT |
1986 | /* |
1987 | * This actually clears the dirty bit in the radix tree. | |
1988 | * See cifs_writepage() for more commentary. | |
1989 | */ | |
1990 | set_page_writeback(page); | |
1991 | ||
3a98b861 | 1992 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1993 | done = true; |
84d2f07e | 1994 | unlock_page(page); |
cb876f45 | 1995 | end_page_writeback(page); |
84d2f07e SF |
1996 | break; |
1997 | } | |
1998 | ||
c3d17b63 JL |
1999 | wdata->pages[i] = page; |
2000 | next = page->index + 1; | |
2001 | ++nr_pages; | |
2002 | } | |
37c0eb46 | 2003 | |
c3d17b63 JL |
2004 | /* reset index to refind any pages skipped */ |
2005 | if (nr_pages == 0) | |
2006 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 2007 | |
c3d17b63 JL |
2008 | /* put any pages we aren't going to use */ |
2009 | for (i = nr_pages; i < found_pages; i++) { | |
2010 | page_cache_release(wdata->pages[i]); | |
2011 | wdata->pages[i] = NULL; | |
2012 | } | |
37c0eb46 | 2013 | |
c3d17b63 JL |
2014 | /* nothing to write? */ |
2015 | if (nr_pages == 0) { | |
2016 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2017 | continue; | |
37c0eb46 | 2018 | } |
fbec9ab9 | 2019 | |
c3d17b63 JL |
2020 | wdata->sync_mode = wbc->sync_mode; |
2021 | wdata->nr_pages = nr_pages; | |
2022 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
2023 | wdata->pagesz = PAGE_CACHE_SIZE; |
2024 | wdata->tailsz = | |
3a98b861 JL |
2025 | min(i_size_read(mapping->host) - |
2026 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
2027 | (loff_t)PAGE_CACHE_SIZE); |
2028 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
2029 | wdata->tailsz; | |
941b853d | 2030 | |
c3d17b63 JL |
2031 | do { |
2032 | if (wdata->cfile != NULL) | |
2033 | cifsFileInfo_put(wdata->cfile); | |
2034 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
2035 | false); | |
2036 | if (!wdata->cfile) { | |
f96637be | 2037 | cifs_dbg(VFS, "No writable handles for inode\n"); |
c3d17b63 JL |
2038 | rc = -EBADF; |
2039 | break; | |
941b853d | 2040 | } |
fe5f5d2e | 2041 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
2042 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
2043 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 2044 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 2045 | |
c3d17b63 JL |
2046 | for (i = 0; i < nr_pages; ++i) |
2047 | unlock_page(wdata->pages[i]); | |
f3983c21 | 2048 | |
c3d17b63 JL |
2049 | /* send failure -- clean up the mess */ |
2050 | if (rc != 0) { | |
2051 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2052 | if (rc == -EAGAIN) |
c3d17b63 JL |
2053 | redirty_page_for_writepage(wbc, |
2054 | wdata->pages[i]); | |
2055 | else | |
2056 | SetPageError(wdata->pages[i]); | |
2057 | end_page_writeback(wdata->pages[i]); | |
2058 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2059 | } |
941b853d JL |
2060 | if (rc != -EAGAIN) |
2061 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2062 | } |
2063 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2064 | |
c3d17b63 JL |
2065 | wbc->nr_to_write -= nr_pages; |
2066 | if (wbc->nr_to_write <= 0) | |
2067 | done = true; | |
b066a48c | 2068 | |
c3d17b63 | 2069 | index = next; |
37c0eb46 | 2070 | } |
c3d17b63 | 2071 | |
37c0eb46 SF |
2072 | if (!scanned && !done) { |
2073 | /* | |
2074 | * We hit the last page and there is more work to be done: wrap | |
2075 | * back to the start of the file | |
2076 | */ | |
c3d17b63 | 2077 | scanned = true; |
37c0eb46 SF |
2078 | index = 0; |
2079 | goto retry; | |
2080 | } | |
c3d17b63 | 2081 | |
111ebb6e | 2082 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2083 | mapping->writeback_index = index; |
2084 | ||
1da177e4 LT |
2085 | return rc; |
2086 | } | |
1da177e4 | 2087 | |
9ad1506b PS |
2088 | static int |
2089 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2090 | { |
9ad1506b | 2091 | int rc; |
6d5786a3 | 2092 | unsigned int xid; |
1da177e4 | 2093 | |
6d5786a3 | 2094 | xid = get_xid(); |
1da177e4 LT |
2095 | /* BB add check for wbc flags */ |
2096 | page_cache_get(page); | |
ad7a2926 | 2097 | if (!PageUptodate(page)) |
f96637be | 2098 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2099 | |
2100 | /* | |
2101 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2102 | * | |
2103 | * A writepage() implementation always needs to do either this, | |
2104 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2105 | * the case of a failure. | |
2106 | * | |
2107 | * Just unlocking the page will cause the radix tree tag-bits | |
2108 | * to fail to update with the state of the page correctly. | |
2109 | */ | |
fb8c4b14 | 2110 | set_page_writeback(page); |
9ad1506b | 2111 | retry_write: |
1da177e4 | 2112 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2113 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2114 | goto retry_write; | |
2115 | else if (rc == -EAGAIN) | |
2116 | redirty_page_for_writepage(wbc, page); | |
2117 | else if (rc != 0) | |
2118 | SetPageError(page); | |
2119 | else | |
2120 | SetPageUptodate(page); | |
cb876f45 LT |
2121 | end_page_writeback(page); |
2122 | page_cache_release(page); | |
6d5786a3 | 2123 | free_xid(xid); |
1da177e4 LT |
2124 | return rc; |
2125 | } | |
2126 | ||
9ad1506b PS |
2127 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2128 | { | |
2129 | int rc = cifs_writepage_locked(page, wbc); | |
2130 | unlock_page(page); | |
2131 | return rc; | |
2132 | } | |
2133 | ||
d9414774 NP |
2134 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2135 | loff_t pos, unsigned len, unsigned copied, | |
2136 | struct page *page, void *fsdata) | |
1da177e4 | 2137 | { |
d9414774 NP |
2138 | int rc; |
2139 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2140 | struct cifsFileInfo *cfile = file->private_data; |
2141 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2142 | __u32 pid; | |
2143 | ||
2144 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2145 | pid = cfile->pid; | |
2146 | else | |
2147 | pid = current->tgid; | |
1da177e4 | 2148 | |
f96637be | 2149 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2150 | page, pos, copied); |
d9414774 | 2151 | |
a98ee8c1 JL |
2152 | if (PageChecked(page)) { |
2153 | if (copied == len) | |
2154 | SetPageUptodate(page); | |
2155 | ClearPageChecked(page); | |
2156 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2157 | SetPageUptodate(page); |
ad7a2926 | 2158 | |
1da177e4 | 2159 | if (!PageUptodate(page)) { |
d9414774 NP |
2160 | char *page_data; |
2161 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2162 | unsigned int xid; |
d9414774 | 2163 | |
6d5786a3 | 2164 | xid = get_xid(); |
1da177e4 LT |
2165 | /* this is probably better than directly calling |
2166 | partialpage_write since in this function the file handle is | |
2167 | known which we might as well leverage */ | |
2168 | /* BB check if anything else missing out of ppw | |
2169 | such as updating last write time */ | |
2170 | page_data = kmap(page); | |
d4ffff1f | 2171 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2172 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2173 | kunmap(page); |
d9414774 | 2174 | |
6d5786a3 | 2175 | free_xid(xid); |
fb8c4b14 | 2176 | } else { |
d9414774 NP |
2177 | rc = copied; |
2178 | pos += copied; | |
ca8aa29c | 2179 | set_page_dirty(page); |
1da177e4 LT |
2180 | } |
2181 | ||
d9414774 NP |
2182 | if (rc > 0) { |
2183 | spin_lock(&inode->i_lock); | |
2184 | if (pos > inode->i_size) | |
2185 | i_size_write(inode, pos); | |
2186 | spin_unlock(&inode->i_lock); | |
2187 | } | |
2188 | ||
2189 | unlock_page(page); | |
2190 | page_cache_release(page); | |
2191 | ||
1da177e4 LT |
2192 | return rc; |
2193 | } | |
2194 | ||
02c24a82 JB |
2195 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2196 | int datasync) | |
1da177e4 | 2197 | { |
6d5786a3 | 2198 | unsigned int xid; |
1da177e4 | 2199 | int rc = 0; |
96daf2b0 | 2200 | struct cifs_tcon *tcon; |
1d8c4c00 | 2201 | struct TCP_Server_Info *server; |
c21dfb69 | 2202 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2203 | struct inode *inode = file_inode(file); |
8be7e6ba | 2204 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2205 | |
02c24a82 JB |
2206 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2207 | if (rc) | |
2208 | return rc; | |
2209 | mutex_lock(&inode->i_mutex); | |
2210 | ||
6d5786a3 | 2211 | xid = get_xid(); |
1da177e4 | 2212 | |
f96637be JP |
2213 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2214 | file->f_path.dentry->d_name.name, datasync); | |
50c2f753 | 2215 | |
6feb9891 PS |
2216 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2217 | rc = cifs_invalidate_mapping(inode); | |
2218 | if (rc) { | |
f96637be | 2219 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2220 | rc = 0; /* don't care about it in fsync */ |
2221 | } | |
2222 | } | |
eb4b756b | 2223 | |
8be7e6ba | 2224 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2225 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2226 | server = tcon->ses->server; | |
2227 | if (server->ops->flush) | |
2228 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2229 | else | |
2230 | rc = -ENOSYS; | |
2231 | } | |
8be7e6ba | 2232 | |
6d5786a3 | 2233 | free_xid(xid); |
02c24a82 | 2234 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2235 | return rc; |
2236 | } | |
2237 | ||
02c24a82 | 2238 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2239 | { |
6d5786a3 | 2240 | unsigned int xid; |
8be7e6ba | 2241 | int rc = 0; |
96daf2b0 | 2242 | struct cifs_tcon *tcon; |
1d8c4c00 | 2243 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2244 | struct cifsFileInfo *smbfile = file->private_data; |
2245 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2246 | struct inode *inode = file->f_mapping->host; |
2247 | ||
2248 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2249 | if (rc) | |
2250 | return rc; | |
2251 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2252 | |
6d5786a3 | 2253 | xid = get_xid(); |
8be7e6ba | 2254 | |
f96637be JP |
2255 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2256 | file->f_path.dentry->d_name.name, datasync); | |
8be7e6ba PS |
2257 | |
2258 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2259 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2260 | server = tcon->ses->server; | |
2261 | if (server->ops->flush) | |
2262 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2263 | else | |
2264 | rc = -ENOSYS; | |
2265 | } | |
b298f223 | 2266 | |
6d5786a3 | 2267 | free_xid(xid); |
02c24a82 | 2268 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2269 | return rc; |
2270 | } | |
2271 | ||
1da177e4 LT |
2272 | /* |
2273 | * As file closes, flush all cached write data for this inode checking | |
2274 | * for write behind errors. | |
2275 | */ | |
75e1fcc0 | 2276 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2277 | { |
496ad9aa | 2278 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2279 | int rc = 0; |
2280 | ||
eb4b756b | 2281 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2282 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2283 | |
f96637be | 2284 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2285 | |
2286 | return rc; | |
2287 | } | |
2288 | ||
72432ffc PS |
2289 | static int |
2290 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2291 | { | |
2292 | int rc = 0; | |
2293 | unsigned long i; | |
2294 | ||
2295 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2296 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2297 | if (!pages[i]) { |
2298 | /* | |
2299 | * save number of pages we have already allocated and | |
2300 | * return with ENOMEM error | |
2301 | */ | |
2302 | num_pages = i; | |
2303 | rc = -ENOMEM; | |
e94f7ba1 | 2304 | break; |
72432ffc PS |
2305 | } |
2306 | } | |
2307 | ||
e94f7ba1 JL |
2308 | if (rc) { |
2309 | for (i = 0; i < num_pages; i++) | |
2310 | put_page(pages[i]); | |
2311 | } | |
72432ffc PS |
2312 | return rc; |
2313 | } | |
2314 | ||
2315 | static inline | |
2316 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2317 | { | |
2318 | size_t num_pages; | |
2319 | size_t clen; | |
2320 | ||
2321 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2322 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2323 | |
2324 | if (cur_len) | |
2325 | *cur_len = clen; | |
2326 | ||
2327 | return num_pages; | |
2328 | } | |
2329 | ||
da82f7e7 JL |
2330 | static void |
2331 | cifs_uncached_writev_complete(struct work_struct *work) | |
2332 | { | |
2333 | int i; | |
2334 | struct cifs_writedata *wdata = container_of(work, | |
2335 | struct cifs_writedata, work); | |
2336 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2337 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2338 | ||
2339 | spin_lock(&inode->i_lock); | |
2340 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2341 | if (cifsi->server_eof > inode->i_size) | |
2342 | i_size_write(inode, cifsi->server_eof); | |
2343 | spin_unlock(&inode->i_lock); | |
2344 | ||
2345 | complete(&wdata->done); | |
2346 | ||
2347 | if (wdata->result != -EAGAIN) { | |
2348 | for (i = 0; i < wdata->nr_pages; i++) | |
2349 | put_page(wdata->pages[i]); | |
2350 | } | |
2351 | ||
2352 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2353 | } | |
2354 | ||
2355 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2356 | static int | |
2357 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2358 | { | |
2359 | int rc; | |
c9de5c80 PS |
2360 | struct TCP_Server_Info *server; |
2361 | ||
2362 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2363 | |
2364 | do { | |
2365 | if (wdata->cfile->invalidHandle) { | |
2366 | rc = cifs_reopen_file(wdata->cfile, false); | |
2367 | if (rc != 0) | |
2368 | continue; | |
2369 | } | |
c9de5c80 | 2370 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2371 | } while (rc == -EAGAIN); |
2372 | ||
2373 | return rc; | |
2374 | } | |
2375 | ||
72432ffc PS |
2376 | static ssize_t |
2377 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2378 | unsigned long nr_segs, loff_t *poffset) | |
2379 | { | |
da82f7e7 | 2380 | unsigned long nr_pages, i; |
76429c14 PS |
2381 | size_t copied, len, cur_len; |
2382 | ssize_t total_written = 0; | |
3af9d8f2 | 2383 | loff_t offset; |
72432ffc | 2384 | struct iov_iter it; |
72432ffc | 2385 | struct cifsFileInfo *open_file; |
da82f7e7 | 2386 | struct cifs_tcon *tcon; |
72432ffc | 2387 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2388 | struct cifs_writedata *wdata, *tmp; |
2389 | struct list_head wdata_list; | |
2390 | int rc; | |
2391 | pid_t pid; | |
72432ffc PS |
2392 | |
2393 | len = iov_length(iov, nr_segs); | |
2394 | if (!len) | |
2395 | return 0; | |
2396 | ||
2397 | rc = generic_write_checks(file, poffset, &len, 0); | |
2398 | if (rc) | |
2399 | return rc; | |
2400 | ||
da82f7e7 | 2401 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2402 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2403 | open_file = file->private_data; |
da82f7e7 | 2404 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2405 | |
2406 | if (!tcon->ses->server->ops->async_writev) | |
2407 | return -ENOSYS; | |
2408 | ||
3af9d8f2 | 2409 | offset = *poffset; |
d4ffff1f PS |
2410 | |
2411 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2412 | pid = open_file->pid; | |
2413 | else | |
2414 | pid = current->tgid; | |
2415 | ||
72432ffc | 2416 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2417 | do { |
da82f7e7 JL |
2418 | size_t save_len; |
2419 | ||
2420 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2421 | wdata = cifs_writedata_alloc(nr_pages, | |
2422 | cifs_uncached_writev_complete); | |
2423 | if (!wdata) { | |
2424 | rc = -ENOMEM; | |
2425 | break; | |
2426 | } | |
2427 | ||
2428 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2429 | if (rc) { | |
2430 | kfree(wdata); | |
2431 | break; | |
2432 | } | |
2433 | ||
2434 | save_len = cur_len; | |
2435 | for (i = 0; i < nr_pages; i++) { | |
2436 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2437 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2438 | 0, copied); | |
72432ffc PS |
2439 | cur_len -= copied; |
2440 | iov_iter_advance(&it, copied); | |
72432ffc | 2441 | } |
72432ffc PS |
2442 | cur_len = save_len - cur_len; |
2443 | ||
da82f7e7 JL |
2444 | wdata->sync_mode = WB_SYNC_ALL; |
2445 | wdata->nr_pages = nr_pages; | |
2446 | wdata->offset = (__u64)offset; | |
2447 | wdata->cfile = cifsFileInfo_get(open_file); | |
2448 | wdata->pid = pid; | |
2449 | wdata->bytes = cur_len; | |
eddb079d JL |
2450 | wdata->pagesz = PAGE_SIZE; |
2451 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2452 | rc = cifs_uncached_retry_writev(wdata); |
2453 | if (rc) { | |
2454 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2455 | break; |
2456 | } | |
2457 | ||
da82f7e7 JL |
2458 | list_add_tail(&wdata->list, &wdata_list); |
2459 | offset += cur_len; | |
2460 | len -= cur_len; | |
72432ffc PS |
2461 | } while (len > 0); |
2462 | ||
da82f7e7 JL |
2463 | /* |
2464 | * If at least one write was successfully sent, then discard any rc | |
2465 | * value from the later writes. If the other write succeeds, then | |
2466 | * we'll end up returning whatever was written. If it fails, then | |
2467 | * we'll get a new rc value from that. | |
2468 | */ | |
2469 | if (!list_empty(&wdata_list)) | |
2470 | rc = 0; | |
2471 | ||
2472 | /* | |
2473 | * Wait for and collect replies for any successful sends in order of | |
2474 | * increasing offset. Once an error is hit or we get a fatal signal | |
2475 | * while waiting, then return without waiting for any more replies. | |
2476 | */ | |
2477 | restart_loop: | |
2478 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2479 | if (!rc) { | |
2480 | /* FIXME: freezable too? */ | |
2481 | rc = wait_for_completion_killable(&wdata->done); | |
2482 | if (rc) | |
2483 | rc = -EINTR; | |
2484 | else if (wdata->result) | |
2485 | rc = wdata->result; | |
2486 | else | |
2487 | total_written += wdata->bytes; | |
2488 | ||
2489 | /* resend call if it's a retryable error */ | |
2490 | if (rc == -EAGAIN) { | |
2491 | rc = cifs_uncached_retry_writev(wdata); | |
2492 | goto restart_loop; | |
2493 | } | |
2494 | } | |
2495 | list_del_init(&wdata->list); | |
2496 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2497 | } |
2498 | ||
da82f7e7 JL |
2499 | if (total_written > 0) |
2500 | *poffset += total_written; | |
72432ffc | 2501 | |
da82f7e7 JL |
2502 | cifs_stats_bytes_written(tcon, total_written); |
2503 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2504 | } |
2505 | ||
0b81c1c4 | 2506 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2507 | unsigned long nr_segs, loff_t pos) |
2508 | { | |
2509 | ssize_t written; | |
2510 | struct inode *inode; | |
2511 | ||
496ad9aa | 2512 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2513 | |
2514 | /* | |
2515 | * BB - optimize the way when signing is disabled. We can drop this | |
2516 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2517 | * write request. | |
2518 | */ | |
2519 | ||
2520 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2521 | if (written > 0) { | |
2522 | CIFS_I(inode)->invalid_mapping = true; | |
2523 | iocb->ki_pos = pos; | |
2524 | } | |
2525 | ||
2526 | return written; | |
2527 | } | |
2528 | ||
579f9053 | 2529 | static ssize_t |
ca8aa29c PS |
2530 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, |
2531 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2532 | { |
579f9053 PS |
2533 | struct file *file = iocb->ki_filp; |
2534 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2535 | struct inode *inode = file->f_mapping->host; | |
2536 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2537 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2538 | ssize_t rc = -EACCES; | |
72432ffc | 2539 | |
579f9053 | 2540 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2541 | |
579f9053 PS |
2542 | /* |
2543 | * We need to hold the sem to be sure nobody modifies lock list | |
2544 | * with a brlock that prevents writing. | |
2545 | */ | |
2546 | down_read(&cinode->lock_sem); | |
2547 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2548 | server->vals->exclusive_lock_type, NULL, | |
081c0414 | 2549 | CIFS_WRITE_OP)) { |
579f9053 PS |
2550 | mutex_lock(&inode->i_mutex); |
2551 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
ca8aa29c | 2552 | &iocb->ki_pos); |
579f9053 PS |
2553 | mutex_unlock(&inode->i_mutex); |
2554 | } | |
2555 | ||
2556 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2557 | ssize_t err; | |
2558 | ||
2559 | err = generic_write_sync(file, pos, rc); | |
2560 | if (err < 0 && rc > 0) | |
2561 | rc = err; | |
2562 | } | |
2563 | ||
2564 | up_read(&cinode->lock_sem); | |
579f9053 PS |
2565 | return rc; |
2566 | } | |
2567 | ||
2568 | ssize_t | |
2569 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2570 | unsigned long nr_segs, loff_t pos) | |
2571 | { | |
496ad9aa | 2572 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2573 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2574 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2575 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2576 | iocb->ki_filp->private_data; | |
2577 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2578 | ssize_t written; |
ca8aa29c | 2579 | |
88cf75aa PS |
2580 | if (cinode->clientCanCacheAll) { |
2581 | if (cap_unix(tcon->ses) && | |
2582 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
2583 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2584 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2585 | return cifs_writev(iocb, iov, nr_segs, pos); | |
25078105 | 2586 | } |
25078105 | 2587 | /* |
ca8aa29c PS |
2588 | * For non-oplocked files in strict cache mode we need to write the data |
2589 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2590 | * affected pages because it may cause a error with mandatory locks on | |
2591 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2592 | */ |
88cf75aa PS |
2593 | written = cifs_user_writev(iocb, iov, nr_segs, pos); |
2594 | if (written > 0 && cinode->clientCanCacheRead) { | |
2595 | /* | |
2596 | * Windows 7 server can delay breaking level2 oplock if a write | |
2597 | * request comes - break it on the client to prevent reading | |
2598 | * an old data. | |
2599 | */ | |
2600 | cifs_invalidate_mapping(inode); | |
f96637be JP |
2601 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2602 | inode); | |
88cf75aa PS |
2603 | cinode->clientCanCacheRead = false; |
2604 | } | |
2605 | return written; | |
72432ffc PS |
2606 | } |
2607 | ||
0471ca3f | 2608 | static struct cifs_readdata * |
f4e49cd2 | 2609 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2610 | { |
2611 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2612 | |
c5fab6f4 JL |
2613 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2614 | GFP_KERNEL); | |
0471ca3f | 2615 | if (rdata != NULL) { |
6993f74a | 2616 | kref_init(&rdata->refcount); |
1c892549 JL |
2617 | INIT_LIST_HEAD(&rdata->list); |
2618 | init_completion(&rdata->done); | |
0471ca3f | 2619 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2620 | } |
f4e49cd2 | 2621 | |
0471ca3f JL |
2622 | return rdata; |
2623 | } | |
2624 | ||
6993f74a JL |
2625 | void |
2626 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2627 | { |
6993f74a JL |
2628 | struct cifs_readdata *rdata = container_of(refcount, |
2629 | struct cifs_readdata, refcount); | |
2630 | ||
2631 | if (rdata->cfile) | |
2632 | cifsFileInfo_put(rdata->cfile); | |
2633 | ||
0471ca3f JL |
2634 | kfree(rdata); |
2635 | } | |
2636 | ||
1c892549 | 2637 | static int |
c5fab6f4 | 2638 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2639 | { |
2640 | int rc = 0; | |
c5fab6f4 | 2641 | struct page *page; |
1c892549 JL |
2642 | unsigned int i; |
2643 | ||
c5fab6f4 | 2644 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2645 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2646 | if (!page) { | |
2647 | rc = -ENOMEM; | |
2648 | break; | |
2649 | } | |
c5fab6f4 | 2650 | rdata->pages[i] = page; |
1c892549 JL |
2651 | } |
2652 | ||
2653 | if (rc) { | |
c5fab6f4 JL |
2654 | for (i = 0; i < nr_pages; i++) { |
2655 | put_page(rdata->pages[i]); | |
2656 | rdata->pages[i] = NULL; | |
1c892549 JL |
2657 | } |
2658 | } | |
2659 | return rc; | |
2660 | } | |
2661 | ||
2662 | static void | |
2663 | cifs_uncached_readdata_release(struct kref *refcount) | |
2664 | { | |
1c892549 JL |
2665 | struct cifs_readdata *rdata = container_of(refcount, |
2666 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2667 | unsigned int i; |
1c892549 | 2668 | |
c5fab6f4 JL |
2669 | for (i = 0; i < rdata->nr_pages; i++) { |
2670 | put_page(rdata->pages[i]); | |
2671 | rdata->pages[i] = NULL; | |
1c892549 JL |
2672 | } |
2673 | cifs_readdata_release(refcount); | |
2674 | } | |
2675 | ||
2a1bb138 JL |
2676 | static int |
2677 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2678 | { | |
2679 | int rc; | |
fc9c5966 PS |
2680 | struct TCP_Server_Info *server; |
2681 | ||
2682 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2683 | |
2684 | do { | |
2685 | if (rdata->cfile->invalidHandle) { | |
2686 | rc = cifs_reopen_file(rdata->cfile, true); | |
2687 | if (rc != 0) | |
2688 | continue; | |
2689 | } | |
fc9c5966 | 2690 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2691 | } while (rc == -EAGAIN); |
2692 | ||
2693 | return rc; | |
2694 | } | |
2695 | ||
1c892549 JL |
2696 | /** |
2697 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2698 | * @rdata: the readdata response with list of pages holding data | |
2699 | * @iov: vector in which we should copy the data | |
2700 | * @nr_segs: number of segments in vector | |
2701 | * @offset: offset into file of the first iovec | |
2702 | * @copied: used to return the amount of data copied to the iov | |
2703 | * | |
2704 | * This function copies data from a list of pages in a readdata response into | |
2705 | * an array of iovecs. It will first calculate where the data should go | |
2706 | * based on the info in the readdata and then copy the data into that spot. | |
2707 | */ | |
2708 | static ssize_t | |
2709 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2710 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2711 | { | |
2712 | int rc = 0; | |
2713 | struct iov_iter ii; | |
2714 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2715 | ssize_t remaining = rdata->bytes; |
2716 | unsigned char *pdata; | |
c5fab6f4 | 2717 | unsigned int i; |
1c892549 JL |
2718 | |
2719 | /* set up iov_iter and advance to the correct offset */ | |
2720 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2721 | iov_iter_advance(&ii, pos); | |
2722 | ||
2723 | *copied = 0; | |
c5fab6f4 | 2724 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2725 | ssize_t copy; |
c5fab6f4 | 2726 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2727 | |
2728 | /* copy a whole page or whatever's left */ | |
2729 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2730 | ||
2731 | /* ...but limit it to whatever space is left in the iov */ | |
2732 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2733 | ||
2734 | /* go while there's data to be copied and no errors */ | |
2735 | if (copy && !rc) { | |
2736 | pdata = kmap(page); | |
2737 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2738 | (int)copy); | |
2739 | kunmap(page); | |
2740 | if (!rc) { | |
2741 | *copied += copy; | |
2742 | remaining -= copy; | |
2743 | iov_iter_advance(&ii, copy); | |
2744 | } | |
2745 | } | |
1c892549 JL |
2746 | } |
2747 | ||
2748 | return rc; | |
2749 | } | |
2750 | ||
2751 | static void | |
2752 | cifs_uncached_readv_complete(struct work_struct *work) | |
2753 | { | |
2754 | struct cifs_readdata *rdata = container_of(work, | |
2755 | struct cifs_readdata, work); | |
1c892549 JL |
2756 | |
2757 | complete(&rdata->done); | |
2758 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2759 | } | |
2760 | ||
2761 | static int | |
8321fec4 JL |
2762 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2763 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2764 | { |
8321fec4 | 2765 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2766 | unsigned int i; |
2767 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2768 | struct kvec iov; |
1c892549 | 2769 | |
8321fec4 | 2770 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2771 | for (i = 0; i < nr_pages; i++) { |
2772 | struct page *page = rdata->pages[i]; | |
2773 | ||
8321fec4 | 2774 | if (len >= PAGE_SIZE) { |
1c892549 | 2775 | /* enough data to fill the page */ |
8321fec4 JL |
2776 | iov.iov_base = kmap(page); |
2777 | iov.iov_len = PAGE_SIZE; | |
f96637be JP |
2778 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2779 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2780 | len -= PAGE_SIZE; |
2781 | } else if (len > 0) { | |
1c892549 | 2782 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2783 | iov.iov_base = kmap(page); |
2784 | iov.iov_len = len; | |
f96637be JP |
2785 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2786 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2787 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); |
2788 | rdata->tailsz = len; | |
2789 | len = 0; | |
1c892549 JL |
2790 | } else { |
2791 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2792 | rdata->pages[i] = NULL; |
2793 | rdata->nr_pages--; | |
1c892549 | 2794 | put_page(page); |
8321fec4 | 2795 | continue; |
1c892549 | 2796 | } |
8321fec4 JL |
2797 | |
2798 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2799 | kunmap(page); | |
2800 | if (result < 0) | |
2801 | break; | |
2802 | ||
2803 | total_read += result; | |
1c892549 JL |
2804 | } |
2805 | ||
8321fec4 | 2806 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2807 | } |
2808 | ||
a70307ee PS |
2809 | static ssize_t |
2810 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2811 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2812 | { |
1c892549 | 2813 | ssize_t rc; |
a70307ee | 2814 | size_t len, cur_len; |
1c892549 JL |
2815 | ssize_t total_read = 0; |
2816 | loff_t offset = *poffset; | |
2817 | unsigned int npages; | |
1da177e4 | 2818 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2819 | struct cifs_tcon *tcon; |
1da177e4 | 2820 | struct cifsFileInfo *open_file; |
1c892549 JL |
2821 | struct cifs_readdata *rdata, *tmp; |
2822 | struct list_head rdata_list; | |
2823 | pid_t pid; | |
a70307ee PS |
2824 | |
2825 | if (!nr_segs) | |
2826 | return 0; | |
2827 | ||
2828 | len = iov_length(iov, nr_segs); | |
2829 | if (!len) | |
2830 | return 0; | |
1da177e4 | 2831 | |
1c892549 | 2832 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2833 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2834 | open_file = file->private_data; |
1c892549 | 2835 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2836 | |
fc9c5966 PS |
2837 | if (!tcon->ses->server->ops->async_readv) |
2838 | return -ENOSYS; | |
2839 | ||
d4ffff1f PS |
2840 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2841 | pid = open_file->pid; | |
2842 | else | |
2843 | pid = current->tgid; | |
2844 | ||
ad7a2926 | 2845 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 2846 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
ad7a2926 | 2847 | |
1c892549 JL |
2848 | do { |
2849 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2850 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2851 | |
1c892549 JL |
2852 | /* allocate a readdata struct */ |
2853 | rdata = cifs_readdata_alloc(npages, | |
2854 | cifs_uncached_readv_complete); | |
2855 | if (!rdata) { | |
2856 | rc = -ENOMEM; | |
2857 | goto error; | |
1da177e4 | 2858 | } |
a70307ee | 2859 | |
c5fab6f4 | 2860 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2861 | if (rc) |
2862 | goto error; | |
2863 | ||
2864 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2865 | rdata->nr_pages = npages; |
1c892549 JL |
2866 | rdata->offset = offset; |
2867 | rdata->bytes = cur_len; | |
2868 | rdata->pid = pid; | |
8321fec4 JL |
2869 | rdata->pagesz = PAGE_SIZE; |
2870 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2871 | |
2872 | rc = cifs_retry_async_readv(rdata); | |
2873 | error: | |
2874 | if (rc) { | |
2875 | kref_put(&rdata->refcount, | |
2876 | cifs_uncached_readdata_release); | |
2877 | break; | |
2878 | } | |
2879 | ||
2880 | list_add_tail(&rdata->list, &rdata_list); | |
2881 | offset += cur_len; | |
2882 | len -= cur_len; | |
2883 | } while (len > 0); | |
2884 | ||
2885 | /* if at least one read request send succeeded, then reset rc */ | |
2886 | if (!list_empty(&rdata_list)) | |
2887 | rc = 0; | |
2888 | ||
2889 | /* the loop below should proceed in the order of increasing offsets */ | |
2890 | restart_loop: | |
2891 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2892 | if (!rc) { | |
2893 | ssize_t copied; | |
2894 | ||
2895 | /* FIXME: freezable sleep too? */ | |
2896 | rc = wait_for_completion_killable(&rdata->done); | |
2897 | if (rc) | |
2898 | rc = -EINTR; | |
2899 | else if (rdata->result) | |
2900 | rc = rdata->result; | |
2901 | else { | |
2902 | rc = cifs_readdata_to_iov(rdata, iov, | |
2903 | nr_segs, *poffset, | |
2904 | &copied); | |
2905 | total_read += copied; | |
2906 | } | |
2907 | ||
2908 | /* resend call if it's a retryable error */ | |
2909 | if (rc == -EAGAIN) { | |
2910 | rc = cifs_retry_async_readv(rdata); | |
2911 | goto restart_loop; | |
1da177e4 | 2912 | } |
1da177e4 | 2913 | } |
1c892549 JL |
2914 | list_del_init(&rdata->list); |
2915 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2916 | } |
a70307ee | 2917 | |
1c892549 JL |
2918 | cifs_stats_bytes_read(tcon, total_read); |
2919 | *poffset += total_read; | |
2920 | ||
09a4707e PS |
2921 | /* mask nodata case */ |
2922 | if (rc == -ENODATA) | |
2923 | rc = 0; | |
2924 | ||
1c892549 | 2925 | return total_read ? total_read : rc; |
1da177e4 LT |
2926 | } |
2927 | ||
0b81c1c4 | 2928 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2929 | unsigned long nr_segs, loff_t pos) |
2930 | { | |
2931 | ssize_t read; | |
2932 | ||
2933 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2934 | if (read > 0) | |
2935 | iocb->ki_pos = pos; | |
2936 | ||
2937 | return read; | |
2938 | } | |
2939 | ||
579f9053 PS |
2940 | ssize_t |
2941 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2942 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2943 | { |
496ad9aa | 2944 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2945 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2946 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2947 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2948 | iocb->ki_filp->private_data; | |
2949 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2950 | int rc = -EACCES; | |
a70307ee PS |
2951 | |
2952 | /* | |
2953 | * In strict cache mode we need to read from the server all the time | |
2954 | * if we don't have level II oplock because the server can delay mtime | |
2955 | * change - so we can't make a decision about inode invalidating. | |
2956 | * And we can also fail with pagereading if there are mandatory locks | |
2957 | * on pages affected by this read but not on the region from pos to | |
2958 | * pos+len-1. | |
2959 | */ | |
579f9053 PS |
2960 | if (!cinode->clientCanCacheRead) |
2961 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2962 | |
579f9053 PS |
2963 | if (cap_unix(tcon->ses) && |
2964 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2965 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2966 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2967 | ||
2968 | /* | |
2969 | * We need to hold the sem to be sure nobody modifies lock list | |
2970 | * with a brlock that prevents reading. | |
2971 | */ | |
2972 | down_read(&cinode->lock_sem); | |
2973 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2974 | tcon->ses->server->vals->shared_lock_type, | |
081c0414 | 2975 | NULL, CIFS_READ_OP)) |
579f9053 PS |
2976 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); |
2977 | up_read(&cinode->lock_sem); | |
2978 | return rc; | |
a70307ee | 2979 | } |
1da177e4 | 2980 | |
f9c6e234 PS |
2981 | static ssize_t |
2982 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2983 | { |
2984 | int rc = -EACCES; | |
2985 | unsigned int bytes_read = 0; | |
2986 | unsigned int total_read; | |
2987 | unsigned int current_read_size; | |
5eba8ab3 | 2988 | unsigned int rsize; |
1da177e4 | 2989 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2990 | struct cifs_tcon *tcon; |
f9c6e234 | 2991 | struct TCP_Server_Info *server; |
6d5786a3 | 2992 | unsigned int xid; |
f9c6e234 | 2993 | char *cur_offset; |
1da177e4 | 2994 | struct cifsFileInfo *open_file; |
d4ffff1f | 2995 | struct cifs_io_parms io_parms; |
ec637e3f | 2996 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2997 | __u32 pid; |
1da177e4 | 2998 | |
6d5786a3 | 2999 | xid = get_xid(); |
e6a00296 | 3000 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 3001 | |
5eba8ab3 JL |
3002 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3003 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3004 | ||
1da177e4 | 3005 | if (file->private_data == NULL) { |
0f3bc09e | 3006 | rc = -EBADF; |
6d5786a3 | 3007 | free_xid(xid); |
0f3bc09e | 3008 | return rc; |
1da177e4 | 3009 | } |
c21dfb69 | 3010 | open_file = file->private_data; |
29e20f9c | 3011 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3012 | server = tcon->ses->server; |
3013 | ||
3014 | if (!server->ops->sync_read) { | |
3015 | free_xid(xid); | |
3016 | return -ENOSYS; | |
3017 | } | |
1da177e4 | 3018 | |
d4ffff1f PS |
3019 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3020 | pid = open_file->pid; | |
3021 | else | |
3022 | pid = current->tgid; | |
3023 | ||
1da177e4 | 3024 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3025 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3026 | |
f9c6e234 PS |
3027 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3028 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3029 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3030 | /* |
3031 | * For windows me and 9x we do not want to request more than it | |
3032 | * negotiated since it will refuse the read then. | |
3033 | */ | |
3034 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3035 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3036 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3037 | CIFSMaxBufSize); |
f9f5c817 | 3038 | } |
1da177e4 LT |
3039 | rc = -EAGAIN; |
3040 | while (rc == -EAGAIN) { | |
cdff08e7 | 3041 | if (open_file->invalidHandle) { |
15886177 | 3042 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3043 | if (rc != 0) |
3044 | break; | |
3045 | } | |
d4ffff1f | 3046 | io_parms.pid = pid; |
29e20f9c | 3047 | io_parms.tcon = tcon; |
f9c6e234 | 3048 | io_parms.offset = *offset; |
d4ffff1f | 3049 | io_parms.length = current_read_size; |
f9c6e234 PS |
3050 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3051 | &bytes_read, &cur_offset, | |
3052 | &buf_type); | |
1da177e4 LT |
3053 | } |
3054 | if (rc || (bytes_read == 0)) { | |
3055 | if (total_read) { | |
3056 | break; | |
3057 | } else { | |
6d5786a3 | 3058 | free_xid(xid); |
1da177e4 LT |
3059 | return rc; |
3060 | } | |
3061 | } else { | |
29e20f9c | 3062 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3063 | *offset += bytes_read; |
1da177e4 LT |
3064 | } |
3065 | } | |
6d5786a3 | 3066 | free_xid(xid); |
1da177e4 LT |
3067 | return total_read; |
3068 | } | |
3069 | ||
ca83ce3d JL |
3070 | /* |
3071 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3072 | * sure that it doesn't change while being written back. | |
3073 | */ | |
3074 | static int | |
3075 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3076 | { | |
3077 | struct page *page = vmf->page; | |
3078 | ||
3079 | lock_page(page); | |
3080 | return VM_FAULT_LOCKED; | |
3081 | } | |
3082 | ||
3083 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3084 | .fault = filemap_fault, | |
3085 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3086 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3087 | }; |
3088 | ||
7a6a19b1 PS |
3089 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3090 | { | |
3091 | int rc, xid; | |
496ad9aa | 3092 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3093 | |
6d5786a3 | 3094 | xid = get_xid(); |
7a6a19b1 | 3095 | |
6feb9891 PS |
3096 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3097 | rc = cifs_invalidate_mapping(inode); | |
3098 | if (rc) | |
3099 | return rc; | |
3100 | } | |
7a6a19b1 PS |
3101 | |
3102 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3103 | if (rc == 0) |
3104 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3105 | free_xid(xid); |
7a6a19b1 PS |
3106 | return rc; |
3107 | } | |
3108 | ||
1da177e4 LT |
3109 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3110 | { | |
1da177e4 LT |
3111 | int rc, xid; |
3112 | ||
6d5786a3 | 3113 | xid = get_xid(); |
abab095d | 3114 | rc = cifs_revalidate_file(file); |
1da177e4 | 3115 | if (rc) { |
f96637be JP |
3116 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3117 | rc); | |
6d5786a3 | 3118 | free_xid(xid); |
1da177e4 LT |
3119 | return rc; |
3120 | } | |
3121 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3122 | if (rc == 0) |
3123 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3124 | free_xid(xid); |
1da177e4 LT |
3125 | return rc; |
3126 | } | |
3127 | ||
0471ca3f JL |
3128 | static void |
3129 | cifs_readv_complete(struct work_struct *work) | |
3130 | { | |
c5fab6f4 | 3131 | unsigned int i; |
0471ca3f JL |
3132 | struct cifs_readdata *rdata = container_of(work, |
3133 | struct cifs_readdata, work); | |
0471ca3f | 3134 | |
c5fab6f4 JL |
3135 | for (i = 0; i < rdata->nr_pages; i++) { |
3136 | struct page *page = rdata->pages[i]; | |
3137 | ||
0471ca3f JL |
3138 | lru_cache_add_file(page); |
3139 | ||
3140 | if (rdata->result == 0) { | |
0471ca3f JL |
3141 | flush_dcache_page(page); |
3142 | SetPageUptodate(page); | |
3143 | } | |
3144 | ||
3145 | unlock_page(page); | |
3146 | ||
3147 | if (rdata->result == 0) | |
3148 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3149 | ||
3150 | page_cache_release(page); | |
c5fab6f4 | 3151 | rdata->pages[i] = NULL; |
0471ca3f | 3152 | } |
6993f74a | 3153 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3154 | } |
3155 | ||
8d5ce4d2 | 3156 | static int |
8321fec4 JL |
3157 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3158 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3159 | { |
8321fec4 | 3160 | int total_read = 0, result = 0; |
c5fab6f4 | 3161 | unsigned int i; |
8d5ce4d2 JL |
3162 | u64 eof; |
3163 | pgoff_t eof_index; | |
c5fab6f4 | 3164 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3165 | struct kvec iov; |
8d5ce4d2 JL |
3166 | |
3167 | /* determine the eof that the server (probably) has */ | |
3168 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3169 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
f96637be | 3170 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3171 | |
8321fec4 | 3172 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3173 | for (i = 0; i < nr_pages; i++) { |
3174 | struct page *page = rdata->pages[i]; | |
3175 | ||
8321fec4 | 3176 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3177 | /* enough data to fill the page */ |
8321fec4 JL |
3178 | iov.iov_base = kmap(page); |
3179 | iov.iov_len = PAGE_CACHE_SIZE; | |
f96637be JP |
3180 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3181 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3182 | len -= PAGE_CACHE_SIZE; |
3183 | } else if (len > 0) { | |
8d5ce4d2 | 3184 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3185 | iov.iov_base = kmap(page); |
3186 | iov.iov_len = len; | |
f96637be JP |
3187 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3188 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3189 | memset(iov.iov_base + len, |
3190 | '\0', PAGE_CACHE_SIZE - len); | |
3191 | rdata->tailsz = len; | |
3192 | len = 0; | |
8d5ce4d2 JL |
3193 | } else if (page->index > eof_index) { |
3194 | /* | |
3195 | * The VFS will not try to do readahead past the | |
3196 | * i_size, but it's possible that we have outstanding | |
3197 | * writes with gaps in the middle and the i_size hasn't | |
3198 | * caught up yet. Populate those with zeroed out pages | |
3199 | * to prevent the VFS from repeatedly attempting to | |
3200 | * fill them until the writes are flushed. | |
3201 | */ | |
3202 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3203 | lru_cache_add_file(page); |
3204 | flush_dcache_page(page); | |
3205 | SetPageUptodate(page); | |
3206 | unlock_page(page); | |
3207 | page_cache_release(page); | |
c5fab6f4 JL |
3208 | rdata->pages[i] = NULL; |
3209 | rdata->nr_pages--; | |
8321fec4 | 3210 | continue; |
8d5ce4d2 JL |
3211 | } else { |
3212 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3213 | lru_cache_add_file(page); |
3214 | unlock_page(page); | |
3215 | page_cache_release(page); | |
c5fab6f4 JL |
3216 | rdata->pages[i] = NULL; |
3217 | rdata->nr_pages--; | |
8321fec4 | 3218 | continue; |
8d5ce4d2 | 3219 | } |
8321fec4 JL |
3220 | |
3221 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3222 | kunmap(page); | |
3223 | if (result < 0) | |
3224 | break; | |
3225 | ||
3226 | total_read += result; | |
8d5ce4d2 JL |
3227 | } |
3228 | ||
8321fec4 | 3229 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3230 | } |
3231 | ||
1da177e4 LT |
3232 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3233 | struct list_head *page_list, unsigned num_pages) | |
3234 | { | |
690c5e31 JL |
3235 | int rc; |
3236 | struct list_head tmplist; | |
3237 | struct cifsFileInfo *open_file = file->private_data; | |
3238 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3239 | unsigned int rsize = cifs_sb->rsize; | |
3240 | pid_t pid; | |
1da177e4 | 3241 | |
690c5e31 JL |
3242 | /* |
3243 | * Give up immediately if rsize is too small to read an entire page. | |
3244 | * The VFS will fall back to readpage. We should never reach this | |
3245 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3246 | * than a cache page. | |
3247 | */ | |
3248 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3249 | return 0; | |
bfa0d75a | 3250 | |
56698236 SJ |
3251 | /* |
3252 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3253 | * immediately if the cookie is negative | |
3254 | */ | |
3255 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3256 | &num_pages); | |
3257 | if (rc == 0) | |
690c5e31 | 3258 | return rc; |
56698236 | 3259 | |
d4ffff1f PS |
3260 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3261 | pid = open_file->pid; | |
3262 | else | |
3263 | pid = current->tgid; | |
3264 | ||
690c5e31 JL |
3265 | rc = 0; |
3266 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3267 | |
f96637be JP |
3268 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3269 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3270 | |
3271 | /* | |
3272 | * Start with the page at end of list and move it to private | |
3273 | * list. Do the same with any following pages until we hit | |
3274 | * the rsize limit, hit an index discontinuity, or run out of | |
3275 | * pages. Issue the async read and then start the loop again | |
3276 | * until the list is empty. | |
3277 | * | |
3278 | * Note that list order is important. The page_list is in | |
3279 | * the order of declining indexes. When we put the pages in | |
3280 | * the rdata->pages, then we want them in increasing order. | |
3281 | */ | |
3282 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3283 | unsigned int i; |
690c5e31 JL |
3284 | unsigned int bytes = PAGE_CACHE_SIZE; |
3285 | unsigned int expected_index; | |
3286 | unsigned int nr_pages = 1; | |
3287 | loff_t offset; | |
3288 | struct page *page, *tpage; | |
3289 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3290 | |
3291 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3292 | |
3293 | /* | |
3294 | * Lock the page and put it in the cache. Since no one else | |
3295 | * should have access to this page, we're safe to simply set | |
3296 | * PG_locked without checking it first. | |
3297 | */ | |
3298 | __set_page_locked(page); | |
3299 | rc = add_to_page_cache_locked(page, mapping, | |
3300 | page->index, GFP_KERNEL); | |
3301 | ||
3302 | /* give up if we can't stick it in the cache */ | |
3303 | if (rc) { | |
3304 | __clear_page_locked(page); | |
3305 | break; | |
3306 | } | |
3307 | ||
3308 | /* move first page to the tmplist */ | |
1da177e4 | 3309 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3310 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3311 | |
690c5e31 JL |
3312 | /* now try and add more pages onto the request */ |
3313 | expected_index = page->index + 1; | |
3314 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3315 | /* discontinuity ? */ | |
3316 | if (page->index != expected_index) | |
fb8c4b14 | 3317 | break; |
690c5e31 JL |
3318 | |
3319 | /* would this page push the read over the rsize? */ | |
3320 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3321 | break; | |
3322 | ||
3323 | __set_page_locked(page); | |
3324 | if (add_to_page_cache_locked(page, mapping, | |
3325 | page->index, GFP_KERNEL)) { | |
3326 | __clear_page_locked(page); | |
3327 | break; | |
3328 | } | |
3329 | list_move_tail(&page->lru, &tmplist); | |
3330 | bytes += PAGE_CACHE_SIZE; | |
3331 | expected_index++; | |
3332 | nr_pages++; | |
1da177e4 | 3333 | } |
690c5e31 | 3334 | |
0471ca3f | 3335 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3336 | if (!rdata) { |
3337 | /* best to give up if we're out of mem */ | |
3338 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3339 | list_del(&page->lru); | |
3340 | lru_cache_add_file(page); | |
3341 | unlock_page(page); | |
3342 | page_cache_release(page); | |
3343 | } | |
3344 | rc = -ENOMEM; | |
3345 | break; | |
3346 | } | |
3347 | ||
6993f74a | 3348 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3349 | rdata->mapping = mapping; |
3350 | rdata->offset = offset; | |
3351 | rdata->bytes = bytes; | |
3352 | rdata->pid = pid; | |
8321fec4 JL |
3353 | rdata->pagesz = PAGE_CACHE_SIZE; |
3354 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3355 | |
3356 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3357 | list_del(&page->lru); | |
3358 | rdata->pages[rdata->nr_pages++] = page; | |
3359 | } | |
690c5e31 | 3360 | |
2a1bb138 | 3361 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3362 | if (rc != 0) { |
c5fab6f4 JL |
3363 | for (i = 0; i < rdata->nr_pages; i++) { |
3364 | page = rdata->pages[i]; | |
690c5e31 JL |
3365 | lru_cache_add_file(page); |
3366 | unlock_page(page); | |
3367 | page_cache_release(page); | |
1da177e4 | 3368 | } |
6993f74a | 3369 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3370 | break; |
3371 | } | |
6993f74a JL |
3372 | |
3373 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3374 | } |
3375 | ||
1da177e4 LT |
3376 | return rc; |
3377 | } | |
3378 | ||
3379 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3380 | loff_t *poffset) | |
3381 | { | |
3382 | char *read_data; | |
3383 | int rc; | |
3384 | ||
56698236 | 3385 | /* Is the page cached? */ |
496ad9aa | 3386 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3387 | if (rc == 0) |
3388 | goto read_complete; | |
3389 | ||
1da177e4 LT |
3390 | page_cache_get(page); |
3391 | read_data = kmap(page); | |
3392 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3393 | |
1da177e4 | 3394 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3395 | |
1da177e4 LT |
3396 | if (rc < 0) |
3397 | goto io_error; | |
3398 | else | |
f96637be | 3399 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3400 | |
496ad9aa AV |
3401 | file_inode(file)->i_atime = |
3402 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3403 | |
1da177e4 LT |
3404 | if (PAGE_CACHE_SIZE > rc) |
3405 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3406 | ||
3407 | flush_dcache_page(page); | |
3408 | SetPageUptodate(page); | |
9dc06558 SJ |
3409 | |
3410 | /* send this page to the cache */ | |
496ad9aa | 3411 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3412 | |
1da177e4 | 3413 | rc = 0; |
fb8c4b14 | 3414 | |
1da177e4 | 3415 | io_error: |
fb8c4b14 | 3416 | kunmap(page); |
1da177e4 | 3417 | page_cache_release(page); |
56698236 SJ |
3418 | |
3419 | read_complete: | |
1da177e4 LT |
3420 | return rc; |
3421 | } | |
3422 | ||
3423 | static int cifs_readpage(struct file *file, struct page *page) | |
3424 | { | |
3425 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3426 | int rc = -EACCES; | |
6d5786a3 | 3427 | unsigned int xid; |
1da177e4 | 3428 | |
6d5786a3 | 3429 | xid = get_xid(); |
1da177e4 LT |
3430 | |
3431 | if (file->private_data == NULL) { | |
0f3bc09e | 3432 | rc = -EBADF; |
6d5786a3 | 3433 | free_xid(xid); |
0f3bc09e | 3434 | return rc; |
1da177e4 LT |
3435 | } |
3436 | ||
f96637be | 3437 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3438 | page, (int)offset, (int)offset); |
1da177e4 LT |
3439 | |
3440 | rc = cifs_readpage_worker(file, page, &offset); | |
3441 | ||
3442 | unlock_page(page); | |
3443 | ||
6d5786a3 | 3444 | free_xid(xid); |
1da177e4 LT |
3445 | return rc; |
3446 | } | |
3447 | ||
a403a0a3 SF |
3448 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3449 | { | |
3450 | struct cifsFileInfo *open_file; | |
3451 | ||
4477288a | 3452 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3453 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3454 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3455 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3456 | return 1; |
3457 | } | |
3458 | } | |
4477288a | 3459 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3460 | return 0; |
3461 | } | |
3462 | ||
1da177e4 LT |
3463 | /* We do not want to update the file size from server for inodes |
3464 | open for write - to avoid races with writepage extending | |
3465 | the file - in the future we could consider allowing | |
fb8c4b14 | 3466 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3467 | but this is tricky to do without racing with writebehind |
3468 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3469 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3470 | { |
a403a0a3 | 3471 | if (!cifsInode) |
4b18f2a9 | 3472 | return true; |
50c2f753 | 3473 | |
a403a0a3 SF |
3474 | if (is_inode_writable(cifsInode)) { |
3475 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3476 | struct cifs_sb_info *cifs_sb; |
3477 | ||
c32a0b68 | 3478 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3479 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3480 | /* since no page cache to corrupt on directio |
c32a0b68 | 3481 | we can change size safely */ |
4b18f2a9 | 3482 | return true; |
c32a0b68 SF |
3483 | } |
3484 | ||
fb8c4b14 | 3485 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3486 | return true; |
7ba52631 | 3487 | |
4b18f2a9 | 3488 | return false; |
23e7dd7d | 3489 | } else |
4b18f2a9 | 3490 | return true; |
1da177e4 LT |
3491 | } |
3492 | ||
d9414774 NP |
3493 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3494 | loff_t pos, unsigned len, unsigned flags, | |
3495 | struct page **pagep, void **fsdata) | |
1da177e4 | 3496 | { |
d9414774 NP |
3497 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3498 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3499 | loff_t page_start = pos & PAGE_MASK; |
3500 | loff_t i_size; | |
3501 | struct page *page; | |
3502 | int rc = 0; | |
d9414774 | 3503 | |
f96637be | 3504 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3505 | |
54566b2c | 3506 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3507 | if (!page) { |
3508 | rc = -ENOMEM; | |
3509 | goto out; | |
3510 | } | |
8a236264 | 3511 | |
a98ee8c1 JL |
3512 | if (PageUptodate(page)) |
3513 | goto out; | |
8a236264 | 3514 | |
a98ee8c1 JL |
3515 | /* |
3516 | * If we write a full page it will be up to date, no need to read from | |
3517 | * the server. If the write is short, we'll end up doing a sync write | |
3518 | * instead. | |
3519 | */ | |
3520 | if (len == PAGE_CACHE_SIZE) | |
3521 | goto out; | |
8a236264 | 3522 | |
a98ee8c1 JL |
3523 | /* |
3524 | * optimize away the read when we have an oplock, and we're not | |
3525 | * expecting to use any of the data we'd be reading in. That | |
3526 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3527 | * and the write will cover all of the existing data. | |
3528 | */ | |
3529 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3530 | i_size = i_size_read(mapping->host); | |
3531 | if (page_start >= i_size || | |
3532 | (offset == 0 && (pos + len) >= i_size)) { | |
3533 | zero_user_segments(page, 0, offset, | |
3534 | offset + len, | |
3535 | PAGE_CACHE_SIZE); | |
3536 | /* | |
3537 | * PageChecked means that the parts of the page | |
3538 | * to which we're not writing are considered up | |
3539 | * to date. Once the data is copied to the | |
3540 | * page, it can be set uptodate. | |
3541 | */ | |
3542 | SetPageChecked(page); | |
3543 | goto out; | |
3544 | } | |
3545 | } | |
d9414774 | 3546 | |
a98ee8c1 JL |
3547 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3548 | /* | |
3549 | * might as well read a page, it is fast enough. If we get | |
3550 | * an error, we don't need to return it. cifs_write_end will | |
3551 | * do a sync write instead since PG_uptodate isn't set. | |
3552 | */ | |
3553 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3554 | } else { |
3555 | /* we could try using another file handle if there is one - | |
3556 | but how would we lock it to prevent close of that handle | |
3557 | racing with this read? In any case | |
d9414774 | 3558 | this will be written out by write_end so is fine */ |
1da177e4 | 3559 | } |
a98ee8c1 JL |
3560 | out: |
3561 | *pagep = page; | |
3562 | return rc; | |
1da177e4 LT |
3563 | } |
3564 | ||
85f2d6b4 SJ |
3565 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3566 | { | |
3567 | if (PagePrivate(page)) | |
3568 | return 0; | |
3569 | ||
3570 | return cifs_fscache_release_page(page, gfp); | |
3571 | } | |
3572 | ||
d47992f8 LC |
3573 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
3574 | unsigned int length) | |
85f2d6b4 SJ |
3575 | { |
3576 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3577 | ||
d47992f8 | 3578 | if (offset == 0 && length == PAGE_CACHE_SIZE) |
85f2d6b4 SJ |
3579 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
3580 | } | |
3581 | ||
9ad1506b PS |
3582 | static int cifs_launder_page(struct page *page) |
3583 | { | |
3584 | int rc = 0; | |
3585 | loff_t range_start = page_offset(page); | |
3586 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3587 | struct writeback_control wbc = { | |
3588 | .sync_mode = WB_SYNC_ALL, | |
3589 | .nr_to_write = 0, | |
3590 | .range_start = range_start, | |
3591 | .range_end = range_end, | |
3592 | }; | |
3593 | ||
f96637be | 3594 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
3595 | |
3596 | if (clear_page_dirty_for_io(page)) | |
3597 | rc = cifs_writepage_locked(page, &wbc); | |
3598 | ||
3599 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3600 | return rc; | |
3601 | } | |
3602 | ||
9b646972 | 3603 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3604 | { |
3605 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3606 | oplock_break); | |
a5e18bc3 | 3607 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3608 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3609 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3610 | int rc = 0; |
3bc303c2 | 3611 | |
63b7d3a4 PS |
3612 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead && |
3613 | cifs_has_mand_locks(cinode)) { | |
f96637be JP |
3614 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
3615 | inode); | |
63b7d3a4 PS |
3616 | cinode->clientCanCacheRead = false; |
3617 | } | |
3618 | ||
3bc303c2 | 3619 | if (inode && S_ISREG(inode->i_mode)) { |
d54ff732 | 3620 | if (cinode->clientCanCacheRead) |
8737c930 | 3621 | break_lease(inode, O_RDONLY); |
d54ff732 | 3622 | else |
8737c930 | 3623 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3624 | rc = filemap_fdatawrite(inode->i_mapping); |
3625 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3626 | rc = filemap_fdatawait(inode->i_mapping); |
3627 | mapping_set_error(inode->i_mapping, rc); | |
03eca704 | 3628 | cifs_invalidate_mapping(inode); |
3bc303c2 | 3629 | } |
f96637be | 3630 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
3631 | } |
3632 | ||
85160e03 PS |
3633 | rc = cifs_push_locks(cfile); |
3634 | if (rc) | |
f96637be | 3635 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 3636 | |
3bc303c2 JL |
3637 | /* |
3638 | * releasing stale oplock after recent reconnect of smb session using | |
3639 | * a now incorrect file handle is not a data integrity issue but do | |
3640 | * not bother sending an oplock release if session to server still is | |
3641 | * disconnected since oplock already released by the server | |
3642 | */ | |
cdff08e7 | 3643 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3644 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3645 | cinode); | |
f96637be | 3646 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 3647 | } |
3bc303c2 JL |
3648 | } |
3649 | ||
f5e54d6e | 3650 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3651 | .readpage = cifs_readpage, |
3652 | .readpages = cifs_readpages, | |
3653 | .writepage = cifs_writepage, | |
37c0eb46 | 3654 | .writepages = cifs_writepages, |
d9414774 NP |
3655 | .write_begin = cifs_write_begin, |
3656 | .write_end = cifs_write_end, | |
1da177e4 | 3657 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3658 | .releasepage = cifs_release_page, |
3659 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3660 | .launder_page = cifs_launder_page, |
1da177e4 | 3661 | }; |
273d81d6 DK |
3662 | |
3663 | /* | |
3664 | * cifs_readpages requires the server to support a buffer large enough to | |
3665 | * contain the header plus one complete page of data. Otherwise, we need | |
3666 | * to leave cifs_readpages out of the address space operations. | |
3667 | */ | |
f5e54d6e | 3668 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3669 | .readpage = cifs_readpage, |
3670 | .writepage = cifs_writepage, | |
3671 | .writepages = cifs_writepages, | |
d9414774 NP |
3672 | .write_begin = cifs_write_begin, |
3673 | .write_end = cifs_write_end, | |
273d81d6 | 3674 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3675 | .releasepage = cifs_release_page, |
3676 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3677 | .launder_page = cifs_launder_page, |
273d81d6 | 3678 | }; |