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