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Commit | Line | Data |
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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) | |
81 | cFYI(1, "Application %s pid %d has incorrectly set O_EXCL flag" | |
82 | "but not O_CREAT on file open. Ignoring O_EXCL", | |
83 | current->comm, current->tgid); | |
84 | ||
608712fe JL |
85 | if (flags & O_TRUNC) |
86 | posix_flags |= SMB_O_TRUNC; | |
87 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 88 | if (flags & O_DSYNC) |
608712fe | 89 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 90 | if (flags & O_DIRECTORY) |
608712fe | 91 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 92 | if (flags & O_NOFOLLOW) |
608712fe | 93 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 94 | if (flags & O_DIRECT) |
608712fe | 95 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
96 | |
97 | return posix_flags; | |
1da177e4 LT |
98 | } |
99 | ||
100 | static inline int cifs_get_disposition(unsigned int flags) | |
101 | { | |
102 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
103 | return FILE_CREATE; | |
104 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
105 | return FILE_OVERWRITE_IF; | |
106 | else if ((flags & O_CREAT) == O_CREAT) | |
107 | return FILE_OPEN_IF; | |
55aa2e09 SF |
108 | else if ((flags & O_TRUNC) == O_TRUNC) |
109 | return FILE_OVERWRITE; | |
1da177e4 LT |
110 | else |
111 | return FILE_OPEN; | |
112 | } | |
113 | ||
608712fe JL |
114 | int cifs_posix_open(char *full_path, struct inode **pinode, |
115 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 116 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
117 | { |
118 | int rc; | |
119 | FILE_UNIX_BASIC_INFO *presp_data; | |
120 | __u32 posix_flags = 0; | |
121 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
122 | struct cifs_fattr fattr; | |
123 | struct tcon_link *tlink; | |
96daf2b0 | 124 | struct cifs_tcon *tcon; |
608712fe JL |
125 | |
126 | cFYI(1, "posix open %s", full_path); | |
127 | ||
128 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
129 | if (presp_data == NULL) | |
130 | return -ENOMEM; | |
131 | ||
132 | tlink = cifs_sb_tlink(cifs_sb); | |
133 | if (IS_ERR(tlink)) { | |
134 | rc = PTR_ERR(tlink); | |
135 | goto posix_open_ret; | |
136 | } | |
137 | ||
138 | tcon = tlink_tcon(tlink); | |
139 | mode &= ~current_umask(); | |
140 | ||
141 | posix_flags = cifs_posix_convert_flags(f_flags); | |
142 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
143 | poplock, full_path, cifs_sb->local_nls, | |
144 | cifs_sb->mnt_cifs_flags & | |
145 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
146 | cifs_put_tlink(tlink); | |
147 | ||
148 | if (rc) | |
149 | goto posix_open_ret; | |
150 | ||
151 | if (presp_data->Type == cpu_to_le32(-1)) | |
152 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
153 | ||
154 | if (!pinode) | |
155 | goto posix_open_ret; /* caller does not need info */ | |
156 | ||
157 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
158 | ||
159 | /* get new inode and set it up */ | |
160 | if (*pinode == NULL) { | |
161 | cifs_fill_uniqueid(sb, &fattr); | |
162 | *pinode = cifs_iget(sb, &fattr); | |
163 | if (!*pinode) { | |
164 | rc = -ENOMEM; | |
165 | goto posix_open_ret; | |
166 | } | |
167 | } else { | |
168 | cifs_fattr_to_inode(*pinode, &fattr); | |
169 | } | |
170 | ||
171 | posix_open_ret: | |
172 | kfree(presp_data); | |
173 | return rc; | |
174 | } | |
175 | ||
eeb910a6 PS |
176 | static int |
177 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
178 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
179 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
180 | { |
181 | int rc; | |
fb1214e4 | 182 | int desired_access; |
eeb910a6 | 183 | int disposition; |
3d3ea8e6 | 184 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 185 | FILE_ALL_INFO *buf; |
b8c32dbb | 186 | struct TCP_Server_Info *server = tcon->ses->server; |
eeb910a6 | 187 | |
b8c32dbb | 188 | if (!server->ops->open) |
fb1214e4 PS |
189 | return -ENOSYS; |
190 | ||
191 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
192 | |
193 | /********************************************************************* | |
194 | * open flag mapping table: | |
195 | * | |
196 | * POSIX Flag CIFS Disposition | |
197 | * ---------- ---------------- | |
198 | * O_CREAT FILE_OPEN_IF | |
199 | * O_CREAT | O_EXCL FILE_CREATE | |
200 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
201 | * O_TRUNC FILE_OVERWRITE | |
202 | * none of the above FILE_OPEN | |
203 | * | |
204 | * Note that there is not a direct match between disposition | |
205 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
206 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
207 | * file rather than creating a new file as FILE_SUPERSEDE does | |
208 | * (which uses the attributes / metadata passed in on open call) | |
209 | *? | |
210 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
211 | *? and the read write flags match reasonably. O_LARGEFILE | |
212 | *? is irrelevant because largefile support is always used | |
213 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
214 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
215 | *********************************************************************/ | |
216 | ||
217 | disposition = cifs_get_disposition(f_flags); | |
218 | ||
219 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
220 | ||
221 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
222 | if (!buf) | |
223 | return -ENOMEM; | |
224 | ||
3d3ea8e6 SP |
225 | if (backup_cred(cifs_sb)) |
226 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
227 | ||
b8c32dbb PS |
228 | rc = server->ops->open(xid, tcon, full_path, disposition, |
229 | desired_access, create_options, fid, oplock, buf, | |
230 | cifs_sb); | |
eeb910a6 PS |
231 | |
232 | if (rc) | |
233 | goto out; | |
234 | ||
235 | if (tcon->unix_ext) | |
236 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
237 | xid); | |
238 | else | |
239 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 240 | xid, &fid->netfid); |
eeb910a6 PS |
241 | |
242 | out: | |
243 | kfree(buf); | |
244 | return rc; | |
245 | } | |
246 | ||
63b7d3a4 PS |
247 | static bool |
248 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
249 | { | |
250 | struct cifs_fid_locks *cur; | |
251 | bool has_locks = false; | |
252 | ||
253 | down_read(&cinode->lock_sem); | |
254 | list_for_each_entry(cur, &cinode->llist, llist) { | |
255 | if (!list_empty(&cur->locks)) { | |
256 | has_locks = true; | |
257 | break; | |
258 | } | |
259 | } | |
260 | up_read(&cinode->lock_sem); | |
261 | return has_locks; | |
262 | } | |
263 | ||
15ecb436 | 264 | struct cifsFileInfo * |
fb1214e4 | 265 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
266 | struct tcon_link *tlink, __u32 oplock) |
267 | { | |
268 | struct dentry *dentry = file->f_path.dentry; | |
269 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
270 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
271 | struct cifsFileInfo *cfile; | |
f45d3416 | 272 | struct cifs_fid_locks *fdlocks; |
233839b1 | 273 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 274 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
275 | |
276 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
277 | if (cfile == NULL) | |
278 | return cfile; | |
279 | ||
f45d3416 PS |
280 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
281 | if (!fdlocks) { | |
282 | kfree(cfile); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | INIT_LIST_HEAD(&fdlocks->locks); | |
287 | fdlocks->cfile = cfile; | |
288 | cfile->llist = fdlocks; | |
1b4b55a1 | 289 | down_write(&cinode->lock_sem); |
f45d3416 | 290 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 291 | up_write(&cinode->lock_sem); |
f45d3416 | 292 | |
4b4de76e | 293 | cfile->count = 1; |
4b4de76e PS |
294 | cfile->pid = current->tgid; |
295 | cfile->uid = current_fsuid(); | |
296 | cfile->dentry = dget(dentry); | |
297 | cfile->f_flags = file->f_flags; | |
298 | cfile->invalidHandle = false; | |
299 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 300 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 301 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 302 | |
63b7d3a4 PS |
303 | /* |
304 | * If the server returned a read oplock and we have mandatory brlocks, | |
305 | * set oplock level to None. | |
306 | */ | |
307 | if (oplock == server->vals->oplock_read && | |
308 | cifs_has_mand_locks(cinode)) { | |
309 | cFYI(1, "Reset oplock val from read to None due to mand locks"); | |
310 | oplock = 0; | |
311 | } | |
312 | ||
4477288a | 313 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 314 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
315 | oplock = fid->pending_open->oplock; |
316 | list_del(&fid->pending_open->olist); | |
317 | ||
63b7d3a4 | 318 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
319 | |
320 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
321 | /* if readable file instance put first in list*/ |
322 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 323 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 324 | else |
4b4de76e | 325 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 326 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 327 | |
4b4de76e PS |
328 | file->private_data = cfile; |
329 | return cfile; | |
15ecb436 JL |
330 | } |
331 | ||
764a1b1a JL |
332 | struct cifsFileInfo * |
333 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
334 | { | |
335 | spin_lock(&cifs_file_list_lock); | |
336 | cifsFileInfo_get_locked(cifs_file); | |
337 | spin_unlock(&cifs_file_list_lock); | |
338 | return cifs_file; | |
339 | } | |
340 | ||
cdff08e7 SF |
341 | /* |
342 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
343 | * the filehandle out on the server. Must be called without holding |
344 | * cifs_file_list_lock. | |
cdff08e7 | 345 | */ |
b33879aa JL |
346 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
347 | { | |
e66673e3 | 348 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 349 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 350 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 351 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 352 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 | 353 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
354 | struct cifs_fid fid; |
355 | struct cifs_pending_open open; | |
cdff08e7 SF |
356 | |
357 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 358 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
359 | spin_unlock(&cifs_file_list_lock); |
360 | return; | |
361 | } | |
362 | ||
233839b1 PS |
363 | if (server->ops->get_lease_key) |
364 | server->ops->get_lease_key(inode, &fid); | |
365 | ||
366 | /* store open in pending opens to make sure we don't miss lease break */ | |
367 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
368 | ||
cdff08e7 SF |
369 | /* remove it from the lists */ |
370 | list_del(&cifs_file->flist); | |
371 | list_del(&cifs_file->tlist); | |
372 | ||
373 | if (list_empty(&cifsi->openFileList)) { | |
374 | cFYI(1, "closing last open instance for inode %p", | |
375 | cifs_file->dentry->d_inode); | |
25364138 PS |
376 | /* |
377 | * In strict cache mode we need invalidate mapping on the last | |
378 | * close because it may cause a error when we open this file | |
379 | * again and get at least level II oplock. | |
380 | */ | |
4f8ba8a0 PS |
381 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
382 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 383 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
384 | } |
385 | spin_unlock(&cifs_file_list_lock); | |
386 | ||
ad635942 JL |
387 | cancel_work_sync(&cifs_file->oplock_break); |
388 | ||
cdff08e7 | 389 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 390 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 391 | unsigned int xid; |
0ff78a22 | 392 | |
6d5786a3 | 393 | xid = get_xid(); |
0ff78a22 | 394 | if (server->ops->close) |
760ad0ca PS |
395 | server->ops->close(xid, tcon, &cifs_file->fid); |
396 | _free_xid(xid); | |
cdff08e7 SF |
397 | } |
398 | ||
233839b1 PS |
399 | cifs_del_pending_open(&open); |
400 | ||
f45d3416 PS |
401 | /* |
402 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
403 | * is closed anyway. |
404 | */ | |
1b4b55a1 | 405 | down_write(&cifsi->lock_sem); |
f45d3416 | 406 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 407 | list_del(&li->llist); |
85160e03 | 408 | cifs_del_lock_waiters(li); |
cdff08e7 | 409 | kfree(li); |
b33879aa | 410 | } |
f45d3416 PS |
411 | list_del(&cifs_file->llist->llist); |
412 | kfree(cifs_file->llist); | |
1b4b55a1 | 413 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
414 | |
415 | cifs_put_tlink(cifs_file->tlink); | |
416 | dput(cifs_file->dentry); | |
417 | kfree(cifs_file); | |
b33879aa JL |
418 | } |
419 | ||
1da177e4 | 420 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 421 | |
1da177e4 LT |
422 | { |
423 | int rc = -EACCES; | |
6d5786a3 | 424 | unsigned int xid; |
590a3fe0 | 425 | __u32 oplock; |
1da177e4 | 426 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 427 | struct TCP_Server_Info *server; |
96daf2b0 | 428 | struct cifs_tcon *tcon; |
7ffec372 | 429 | struct tcon_link *tlink; |
fb1214e4 | 430 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 431 | char *full_path = NULL; |
7e12eddb | 432 | bool posix_open_ok = false; |
fb1214e4 | 433 | struct cifs_fid fid; |
233839b1 | 434 | struct cifs_pending_open open; |
1da177e4 | 435 | |
6d5786a3 | 436 | xid = get_xid(); |
1da177e4 LT |
437 | |
438 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
439 | tlink = cifs_sb_tlink(cifs_sb); |
440 | if (IS_ERR(tlink)) { | |
6d5786a3 | 441 | free_xid(xid); |
7ffec372 JL |
442 | return PTR_ERR(tlink); |
443 | } | |
444 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 445 | server = tcon->ses->server; |
1da177e4 | 446 | |
e6a00296 | 447 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 448 | if (full_path == NULL) { |
0f3bc09e | 449 | rc = -ENOMEM; |
232341ba | 450 | goto out; |
1da177e4 LT |
451 | } |
452 | ||
b6b38f70 JP |
453 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
454 | inode, file->f_flags, full_path); | |
276a74a4 | 455 | |
233839b1 | 456 | if (server->oplocks) |
276a74a4 SF |
457 | oplock = REQ_OPLOCK; |
458 | else | |
459 | oplock = 0; | |
460 | ||
64cc2c63 | 461 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
462 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
463 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 464 | /* can not refresh inode info since size could be stale */ |
2422f676 | 465 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 466 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 467 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 468 | if (rc == 0) { |
b6b38f70 | 469 | cFYI(1, "posix open succeeded"); |
7e12eddb | 470 | posix_open_ok = true; |
64cc2c63 SF |
471 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
472 | if (tcon->ses->serverNOS) | |
b6b38f70 | 473 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
474 | " unexpected error on SMB posix open" |
475 | ", disabling posix open support." | |
476 | " Check if server update available.", | |
477 | tcon->ses->serverName, | |
b6b38f70 | 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 | ||
2ae78ba8 PS |
620 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
621 | 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) { |
b6b38f70 | 642 | cFYI(1, "posix reopen succeeded"); |
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 PS |
670 | mutex_unlock(&cfile->fh_mutex); |
671 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 672 | cFYI(1, "oplock: %d", 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 | |
b6b38f70 | 728 | cFYI(1, "Closedir inode = 0x%p", 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 | |
92fc65a7 PS |
737 | cFYI(1, "Freeing private data in close dir"); |
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; | |
746 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
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) { | |
754 | cFYI(1, "closedir free smb buf in srch struct"); | |
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 | */ | |
d5751469 PS |
1139 | cERROR(1, "Can't push all brlocks!"); |
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) |
b6b38f70 | 1212 | cFYI(1, "Posix"); |
03776f45 | 1213 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1214 | cFYI(1, "Flock"); |
03776f45 | 1215 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1216 | cFYI(1, "Blocking lock"); |
03776f45 | 1217 | *wait_flag = true; |
1da177e4 | 1218 | } |
03776f45 | 1219 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1220 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1221 | "not implemented yet"); |
1222 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1223 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1224 | if (flock->fl_flags & |
3d6d854a JL |
1225 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1226 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
03776f45 | 1227 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1228 | |
106dc538 | 1229 | *type = server->vals->large_lock_type; |
03776f45 | 1230 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1231 | cFYI(1, "F_WRLCK "); |
106dc538 | 1232 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1233 | *lock = 1; |
1234 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1235 | cFYI(1, "F_UNLCK"); |
106dc538 | 1236 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1237 | *unlock = 1; |
1238 | /* Check if unlock includes more than one lock range */ | |
1239 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1240 | cFYI(1, "F_RDLCK"); |
106dc538 | 1241 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1242 | *lock = 1; |
1243 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1244 | cFYI(1, "F_EXLCK"); |
106dc538 | 1245 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1246 | *lock = 1; |
1247 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1248 | cFYI(1, "F_SHLCK"); |
106dc538 | 1249 | *type |= server->vals->shared_lock_type; |
03776f45 | 1250 | *lock = 1; |
1da177e4 | 1251 | } else |
b6b38f70 | 1252 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1253 | } |
1da177e4 | 1254 | |
03776f45 | 1255 | static int |
04a6aa8a | 1256 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1257 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1258 | { |
1259 | int rc = 0; | |
1260 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1261 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1262 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1263 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1264 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1265 | |
03776f45 PS |
1266 | if (posix_lck) { |
1267 | int posix_lock_type; | |
4f6bcec9 PS |
1268 | |
1269 | rc = cifs_posix_lock_test(file, flock); | |
1270 | if (!rc) | |
1271 | return rc; | |
1272 | ||
106dc538 | 1273 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1274 | posix_lock_type = CIFS_RDLCK; |
1275 | else | |
1276 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1277 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1278 | flock->fl_start, length, flock, |
4f6bcec9 | 1279 | posix_lock_type, wait_flag); |
03776f45 PS |
1280 | return rc; |
1281 | } | |
1da177e4 | 1282 | |
fbd35aca | 1283 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1284 | if (!rc) |
1285 | return rc; | |
1286 | ||
03776f45 | 1287 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1288 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1289 | 1, 0, false); | |
03776f45 | 1290 | if (rc == 0) { |
d39a4f71 PS |
1291 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1292 | type, 0, 1, false); | |
03776f45 PS |
1293 | flock->fl_type = F_UNLCK; |
1294 | if (rc != 0) | |
1295 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1296 | "range %d during test of lock", rc); |
a88b4707 | 1297 | return 0; |
1da177e4 | 1298 | } |
7ee1af76 | 1299 | |
106dc538 | 1300 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1301 | flock->fl_type = F_WRLCK; |
a88b4707 | 1302 | return 0; |
7ee1af76 JA |
1303 | } |
1304 | ||
d39a4f71 PS |
1305 | type &= ~server->vals->exclusive_lock_type; |
1306 | ||
1307 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1308 | type | server->vals->shared_lock_type, | |
1309 | 1, 0, false); | |
03776f45 | 1310 | if (rc == 0) { |
d39a4f71 PS |
1311 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1312 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1313 | flock->fl_type = F_RDLCK; |
1314 | if (rc != 0) | |
1315 | cERROR(1, "Error unlocking previously locked " | |
1316 | "range %d during test of lock", rc); | |
1317 | } else | |
1318 | flock->fl_type = F_WRLCK; | |
1319 | ||
a88b4707 | 1320 | return 0; |
03776f45 PS |
1321 | } |
1322 | ||
f7ba7fe6 | 1323 | void |
9ee305b7 PS |
1324 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1325 | { | |
1326 | struct list_head *li, *tmp; | |
1327 | list_for_each_safe(li, tmp, source) | |
1328 | list_move(li, dest); | |
1329 | } | |
1330 | ||
f7ba7fe6 | 1331 | void |
9ee305b7 PS |
1332 | cifs_free_llist(struct list_head *llist) |
1333 | { | |
1334 | struct cifsLockInfo *li, *tmp; | |
1335 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1336 | cifs_del_lock_waiters(li); | |
1337 | list_del(&li->llist); | |
1338 | kfree(li); | |
1339 | } | |
1340 | } | |
1341 | ||
d39a4f71 | 1342 | int |
6d5786a3 PS |
1343 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1344 | unsigned int xid) | |
9ee305b7 PS |
1345 | { |
1346 | int rc = 0, stored_rc; | |
1347 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1348 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1349 | unsigned int i; | |
0013fb4c | 1350 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1351 | LOCKING_ANDX_RANGE *buf, *cur; |
1352 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1353 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1354 | struct cifsLockInfo *li, *tmp; | |
1355 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1356 | struct list_head tmp_llist; | |
1357 | ||
1358 | INIT_LIST_HEAD(&tmp_llist); | |
1359 | ||
0013fb4c PS |
1360 | /* |
1361 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1362 | * and check it for zero before using. | |
1363 | */ | |
1364 | max_buf = tcon->ses->server->maxBuf; | |
1365 | if (!max_buf) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1369 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1370 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1371 | if (!buf) | |
1372 | return -ENOMEM; | |
1373 | ||
1b4b55a1 | 1374 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1375 | for (i = 0; i < 2; i++) { |
1376 | cur = buf; | |
1377 | num = 0; | |
f45d3416 | 1378 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1379 | if (flock->fl_start > li->offset || |
1380 | (flock->fl_start + length) < | |
1381 | (li->offset + li->length)) | |
1382 | continue; | |
1383 | if (current->tgid != li->pid) | |
1384 | continue; | |
9ee305b7 PS |
1385 | if (types[i] != li->type) |
1386 | continue; | |
ea319d57 | 1387 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1388 | /* |
1389 | * We can cache brlock requests - simply remove | |
fbd35aca | 1390 | * a lock from the file's list. |
9ee305b7 PS |
1391 | */ |
1392 | list_del(&li->llist); | |
1393 | cifs_del_lock_waiters(li); | |
1394 | kfree(li); | |
ea319d57 | 1395 | continue; |
9ee305b7 | 1396 | } |
ea319d57 PS |
1397 | cur->Pid = cpu_to_le16(li->pid); |
1398 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1399 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1400 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1401 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1402 | /* | |
1403 | * We need to save a lock here to let us add it again to | |
1404 | * the file's list if the unlock range request fails on | |
1405 | * the server. | |
1406 | */ | |
1407 | list_move(&li->llist, &tmp_llist); | |
1408 | if (++num == max_num) { | |
4b4de76e PS |
1409 | stored_rc = cifs_lockv(xid, tcon, |
1410 | cfile->fid.netfid, | |
ea319d57 PS |
1411 | li->type, num, 0, buf); |
1412 | if (stored_rc) { | |
1413 | /* | |
1414 | * We failed on the unlock range | |
1415 | * request - add all locks from the tmp | |
1416 | * list to the head of the file's list. | |
1417 | */ | |
1418 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1419 | &cfile->llist->locks); |
ea319d57 PS |
1420 | rc = stored_rc; |
1421 | } else | |
1422 | /* | |
1423 | * The unlock range request succeed - | |
1424 | * free the tmp list. | |
1425 | */ | |
1426 | cifs_free_llist(&tmp_llist); | |
1427 | cur = buf; | |
1428 | num = 0; | |
1429 | } else | |
1430 | cur++; | |
9ee305b7 PS |
1431 | } |
1432 | if (num) { | |
4b4de76e | 1433 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1434 | types[i], num, 0, buf); |
1435 | if (stored_rc) { | |
f45d3416 PS |
1436 | cifs_move_llist(&tmp_llist, |
1437 | &cfile->llist->locks); | |
9ee305b7 PS |
1438 | rc = stored_rc; |
1439 | } else | |
1440 | cifs_free_llist(&tmp_llist); | |
1441 | } | |
1442 | } | |
1443 | ||
1b4b55a1 | 1444 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1445 | kfree(buf); |
1446 | return rc; | |
1447 | } | |
1448 | ||
03776f45 | 1449 | static int |
f45d3416 | 1450 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1451 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1452 | unsigned int xid) | |
03776f45 PS |
1453 | { |
1454 | int rc = 0; | |
1455 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1456 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1457 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1458 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1459 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1460 | |
1461 | if (posix_lck) { | |
08547b03 | 1462 | int posix_lock_type; |
4f6bcec9 PS |
1463 | |
1464 | rc = cifs_posix_lock_set(file, flock); | |
1465 | if (!rc || rc < 0) | |
1466 | return rc; | |
1467 | ||
106dc538 | 1468 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1469 | posix_lock_type = CIFS_RDLCK; |
1470 | else | |
1471 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1472 | |
03776f45 | 1473 | if (unlock == 1) |
beb84dc8 | 1474 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1475 | |
f45d3416 PS |
1476 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1477 | current->tgid, flock->fl_start, length, | |
1478 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1479 | goto out; |
1480 | } | |
7ee1af76 | 1481 | |
03776f45 | 1482 | if (lock) { |
161ebf9f PS |
1483 | struct cifsLockInfo *lock; |
1484 | ||
fbd35aca | 1485 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1486 | if (!lock) |
1487 | return -ENOMEM; | |
1488 | ||
fbd35aca | 1489 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1490 | if (rc < 0) { |
161ebf9f | 1491 | kfree(lock); |
21cb2d90 PS |
1492 | return rc; |
1493 | } | |
1494 | if (!rc) | |
85160e03 PS |
1495 | goto out; |
1496 | ||
63b7d3a4 PS |
1497 | /* |
1498 | * Windows 7 server can delay breaking lease from read to None | |
1499 | * if we set a byte-range lock on a file - break it explicitly | |
1500 | * before sending the lock to the server to be sure the next | |
1501 | * read won't conflict with non-overlapted locks due to | |
1502 | * pagereading. | |
1503 | */ | |
1504 | if (!CIFS_I(inode)->clientCanCacheAll && | |
1505 | CIFS_I(inode)->clientCanCacheRead) { | |
1506 | cifs_invalidate_mapping(inode); | |
1507 | cFYI(1, "Set no oplock for inode=%p due to mand locks", | |
1508 | inode); | |
1509 | CIFS_I(inode)->clientCanCacheRead = false; | |
1510 | } | |
1511 | ||
d39a4f71 PS |
1512 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1513 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1514 | if (rc) { |
1515 | kfree(lock); | |
21cb2d90 | 1516 | return rc; |
03776f45 | 1517 | } |
161ebf9f | 1518 | |
fbd35aca | 1519 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1520 | } else if (unlock) |
d39a4f71 | 1521 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1522 | |
03776f45 PS |
1523 | out: |
1524 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1525 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1526 | return rc; |
1527 | } | |
1528 | ||
1529 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1530 | { | |
1531 | int rc, xid; | |
1532 | int lock = 0, unlock = 0; | |
1533 | bool wait_flag = false; | |
1534 | bool posix_lck = false; | |
1535 | struct cifs_sb_info *cifs_sb; | |
1536 | struct cifs_tcon *tcon; | |
1537 | struct cifsInodeInfo *cinode; | |
1538 | struct cifsFileInfo *cfile; | |
1539 | __u16 netfid; | |
04a6aa8a | 1540 | __u32 type; |
03776f45 PS |
1541 | |
1542 | rc = -EACCES; | |
6d5786a3 | 1543 | xid = get_xid(); |
03776f45 PS |
1544 | |
1545 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1546 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1547 | flock->fl_start, flock->fl_end); | |
1548 | ||
03776f45 PS |
1549 | cfile = (struct cifsFileInfo *)file->private_data; |
1550 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1551 | |
1552 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1553 | tcon->ses->server); | |
1554 | ||
1555 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1556 | netfid = cfile->fid.netfid; |
496ad9aa | 1557 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1558 | |
29e20f9c | 1559 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1560 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1561 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1562 | posix_lck = true; | |
1563 | /* | |
1564 | * BB add code here to normalize offset and length to account for | |
1565 | * negative length which we can not accept over the wire. | |
1566 | */ | |
1567 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1568 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1569 | free_xid(xid); |
03776f45 PS |
1570 | return rc; |
1571 | } | |
1572 | ||
1573 | if (!lock && !unlock) { | |
1574 | /* | |
1575 | * if no lock or unlock then nothing to do since we do not | |
1576 | * know what it is | |
1577 | */ | |
6d5786a3 | 1578 | free_xid(xid); |
03776f45 | 1579 | return -EOPNOTSUPP; |
7ee1af76 JA |
1580 | } |
1581 | ||
03776f45 PS |
1582 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1583 | xid); | |
6d5786a3 | 1584 | free_xid(xid); |
1da177e4 LT |
1585 | return rc; |
1586 | } | |
1587 | ||
597b027f JL |
1588 | /* |
1589 | * update the file size (if needed) after a write. Should be called with | |
1590 | * the inode->i_lock held | |
1591 | */ | |
72432ffc | 1592 | void |
fbec9ab9 JL |
1593 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1594 | unsigned int bytes_written) | |
1595 | { | |
1596 | loff_t end_of_write = offset + bytes_written; | |
1597 | ||
1598 | if (end_of_write > cifsi->server_eof) | |
1599 | cifsi->server_eof = end_of_write; | |
1600 | } | |
1601 | ||
ba9ad725 PS |
1602 | static ssize_t |
1603 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1604 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1605 | { |
1606 | int rc = 0; | |
1607 | unsigned int bytes_written = 0; | |
1608 | unsigned int total_written; | |
1609 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1610 | struct cifs_tcon *tcon; |
1611 | struct TCP_Server_Info *server; | |
6d5786a3 | 1612 | unsigned int xid; |
7da4b49a JL |
1613 | struct dentry *dentry = open_file->dentry; |
1614 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1615 | struct cifs_io_parms io_parms; |
1da177e4 | 1616 | |
7da4b49a | 1617 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1618 | |
b6b38f70 | 1619 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1620 | *offset, dentry->d_name.name); |
1da177e4 | 1621 | |
ba9ad725 PS |
1622 | tcon = tlink_tcon(open_file->tlink); |
1623 | server = tcon->ses->server; | |
1624 | ||
1625 | if (!server->ops->sync_write) | |
1626 | return -ENOSYS; | |
50c2f753 | 1627 | |
6d5786a3 | 1628 | xid = get_xid(); |
1da177e4 | 1629 | |
1da177e4 LT |
1630 | for (total_written = 0; write_size > total_written; |
1631 | total_written += bytes_written) { | |
1632 | rc = -EAGAIN; | |
1633 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1634 | struct kvec iov[2]; |
1635 | unsigned int len; | |
1636 | ||
1da177e4 | 1637 | if (open_file->invalidHandle) { |
1da177e4 LT |
1638 | /* we could deadlock if we called |
1639 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1640 | reopen_file not to flush data to |
1da177e4 | 1641 | server now */ |
15886177 | 1642 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1643 | if (rc != 0) |
1644 | break; | |
1645 | } | |
ca83ce3d JL |
1646 | |
1647 | len = min((size_t)cifs_sb->wsize, | |
1648 | write_size - total_written); | |
1649 | /* iov[0] is reserved for smb header */ | |
1650 | iov[1].iov_base = (char *)write_data + total_written; | |
1651 | iov[1].iov_len = len; | |
fa2989f4 | 1652 | io_parms.pid = pid; |
ba9ad725 PS |
1653 | io_parms.tcon = tcon; |
1654 | io_parms.offset = *offset; | |
fa2989f4 | 1655 | io_parms.length = len; |
ba9ad725 PS |
1656 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1657 | &bytes_written, iov, 1); | |
1da177e4 LT |
1658 | } |
1659 | if (rc || (bytes_written == 0)) { | |
1660 | if (total_written) | |
1661 | break; | |
1662 | else { | |
6d5786a3 | 1663 | free_xid(xid); |
1da177e4 LT |
1664 | return rc; |
1665 | } | |
fbec9ab9 | 1666 | } else { |
597b027f | 1667 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1668 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1669 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1670 | *offset += bytes_written; |
fbec9ab9 | 1671 | } |
1da177e4 LT |
1672 | } |
1673 | ||
ba9ad725 | 1674 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1675 | |
7da4b49a JL |
1676 | if (total_written > 0) { |
1677 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1678 | if (*offset > dentry->d_inode->i_size) |
1679 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1680 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1681 | } |
7da4b49a | 1682 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1683 | free_xid(xid); |
1da177e4 LT |
1684 | return total_written; |
1685 | } | |
1686 | ||
6508d904 JL |
1687 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1688 | bool fsuid_only) | |
630f3f0c SF |
1689 | { |
1690 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1691 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1692 | ||
1693 | /* only filter by fsuid on multiuser mounts */ | |
1694 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1695 | fsuid_only = false; | |
630f3f0c | 1696 | |
4477288a | 1697 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1698 | /* we could simply get the first_list_entry since write-only entries |
1699 | are always at the end of the list but since the first entry might | |
1700 | have a close pending, we go through the whole list */ | |
1701 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1702 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1703 | continue; |
2e396b83 | 1704 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1705 | if (!open_file->invalidHandle) { |
1706 | /* found a good file */ | |
1707 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1708 | cifsFileInfo_get_locked(open_file); |
4477288a | 1709 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1710 | return open_file; |
1711 | } /* else might as well continue, and look for | |
1712 | another, or simply have the caller reopen it | |
1713 | again rather than trying to fix this handle */ | |
1714 | } else /* write only file */ | |
1715 | break; /* write only files are last so must be done */ | |
1716 | } | |
4477288a | 1717 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1718 | return NULL; |
1719 | } | |
630f3f0c | 1720 | |
6508d904 JL |
1721 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1722 | bool fsuid_only) | |
6148a742 | 1723 | { |
2c0c2a08 | 1724 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1725 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1726 | bool any_available = false; |
dd99cd80 | 1727 | int rc; |
2c0c2a08 | 1728 | unsigned int refind = 0; |
6148a742 | 1729 | |
60808233 SF |
1730 | /* Having a null inode here (because mapping->host was set to zero by |
1731 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1732 | it being zero) during stress testcases so we need to check for it */ | |
1733 | ||
fb8c4b14 | 1734 | if (cifs_inode == NULL) { |
b6b38f70 | 1735 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1736 | dump_stack(); |
1737 | return NULL; | |
1738 | } | |
1739 | ||
d3892294 JL |
1740 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1741 | ||
6508d904 JL |
1742 | /* only filter by fsuid on multiuser mounts */ |
1743 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1744 | fsuid_only = false; | |
1745 | ||
4477288a | 1746 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1747 | refind_writable: |
2c0c2a08 SP |
1748 | if (refind > MAX_REOPEN_ATT) { |
1749 | spin_unlock(&cifs_file_list_lock); | |
1750 | return NULL; | |
1751 | } | |
6148a742 | 1752 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1753 | if (!any_available && open_file->pid != current->tgid) |
1754 | continue; | |
fef59fd7 | 1755 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1756 | continue; |
2e396b83 | 1757 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1758 | if (!open_file->invalidHandle) { |
1759 | /* found a good writable file */ | |
764a1b1a | 1760 | cifsFileInfo_get_locked(open_file); |
4477288a | 1761 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1762 | return open_file; |
2c0c2a08 SP |
1763 | } else { |
1764 | if (!inv_file) | |
1765 | inv_file = open_file; | |
9b22b0b7 | 1766 | } |
6148a742 SF |
1767 | } |
1768 | } | |
2846d386 JL |
1769 | /* couldn't find useable FH with same pid, try any available */ |
1770 | if (!any_available) { | |
1771 | any_available = true; | |
1772 | goto refind_writable; | |
1773 | } | |
2c0c2a08 SP |
1774 | |
1775 | if (inv_file) { | |
1776 | any_available = false; | |
764a1b1a | 1777 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1778 | } |
1779 | ||
4477288a | 1780 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1781 | |
1782 | if (inv_file) { | |
1783 | rc = cifs_reopen_file(inv_file, false); | |
1784 | if (!rc) | |
1785 | return inv_file; | |
1786 | else { | |
1787 | spin_lock(&cifs_file_list_lock); | |
1788 | list_move_tail(&inv_file->flist, | |
1789 | &cifs_inode->openFileList); | |
1790 | spin_unlock(&cifs_file_list_lock); | |
1791 | cifsFileInfo_put(inv_file); | |
1792 | spin_lock(&cifs_file_list_lock); | |
1793 | ++refind; | |
1794 | goto refind_writable; | |
1795 | } | |
1796 | } | |
1797 | ||
6148a742 SF |
1798 | return NULL; |
1799 | } | |
1800 | ||
1da177e4 LT |
1801 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1802 | { | |
1803 | struct address_space *mapping = page->mapping; | |
1804 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1805 | char *write_data; | |
1806 | int rc = -EFAULT; | |
1807 | int bytes_written = 0; | |
1da177e4 | 1808 | struct inode *inode; |
6148a742 | 1809 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1810 | |
1811 | if (!mapping || !mapping->host) | |
1812 | return -EFAULT; | |
1813 | ||
1814 | inode = page->mapping->host; | |
1da177e4 LT |
1815 | |
1816 | offset += (loff_t)from; | |
1817 | write_data = kmap(page); | |
1818 | write_data += from; | |
1819 | ||
1820 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1821 | kunmap(page); | |
1822 | return -EIO; | |
1823 | } | |
1824 | ||
1825 | /* racing with truncate? */ | |
1826 | if (offset > mapping->host->i_size) { | |
1827 | kunmap(page); | |
1828 | return 0; /* don't care */ | |
1829 | } | |
1830 | ||
1831 | /* check to make sure that we are not extending the file */ | |
1832 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1833 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1834 | |
6508d904 | 1835 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1836 | if (open_file) { |
fa2989f4 PS |
1837 | bytes_written = cifs_write(open_file, open_file->pid, |
1838 | write_data, to - from, &offset); | |
6ab409b5 | 1839 | cifsFileInfo_put(open_file); |
1da177e4 | 1840 | /* Does mm or vfs already set times? */ |
6148a742 | 1841 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1842 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1843 | rc = 0; |
bb5a9a04 SF |
1844 | else if (bytes_written < 0) |
1845 | rc = bytes_written; | |
6148a742 | 1846 | } else { |
b6b38f70 | 1847 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1848 | rc = -EIO; |
1849 | } | |
1850 | ||
1851 | kunmap(page); | |
1852 | return rc; | |
1853 | } | |
1854 | ||
1da177e4 | 1855 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1856 | struct writeback_control *wbc) |
1da177e4 | 1857 | { |
c3d17b63 JL |
1858 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1859 | bool done = false, scanned = false, range_whole = false; | |
1860 | pgoff_t end, index; | |
1861 | struct cifs_writedata *wdata; | |
c9de5c80 | 1862 | struct TCP_Server_Info *server; |
37c0eb46 | 1863 | struct page *page; |
37c0eb46 | 1864 | int rc = 0; |
50c2f753 | 1865 | |
37c0eb46 | 1866 | /* |
c3d17b63 | 1867 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1868 | * one page at a time via cifs_writepage |
1869 | */ | |
1870 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1871 | return generic_writepages(mapping, wbc); | |
1872 | ||
111ebb6e | 1873 | if (wbc->range_cyclic) { |
37c0eb46 | 1874 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1875 | end = -1; |
1876 | } else { | |
1877 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1878 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1879 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1880 | range_whole = true; |
1881 | scanned = true; | |
37c0eb46 SF |
1882 | } |
1883 | retry: | |
c3d17b63 JL |
1884 | while (!done && index <= end) { |
1885 | unsigned int i, nr_pages, found_pages; | |
1886 | pgoff_t next = 0, tofind; | |
1887 | struct page **pages; | |
1888 | ||
1889 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1890 | end - index) + 1; | |
1891 | ||
c2e87640 JL |
1892 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1893 | cifs_writev_complete); | |
c3d17b63 JL |
1894 | if (!wdata) { |
1895 | rc = -ENOMEM; | |
1896 | break; | |
1897 | } | |
1898 | ||
1899 | /* | |
1900 | * find_get_pages_tag seems to return a max of 256 on each | |
1901 | * iteration, so we must call it several times in order to | |
1902 | * fill the array or the wsize is effectively limited to | |
1903 | * 256 * PAGE_CACHE_SIZE. | |
1904 | */ | |
1905 | found_pages = 0; | |
1906 | pages = wdata->pages; | |
1907 | do { | |
1908 | nr_pages = find_get_pages_tag(mapping, &index, | |
1909 | PAGECACHE_TAG_DIRTY, | |
1910 | tofind, pages); | |
1911 | found_pages += nr_pages; | |
1912 | tofind -= nr_pages; | |
1913 | pages += nr_pages; | |
1914 | } while (nr_pages && tofind && index <= end); | |
1915 | ||
1916 | if (found_pages == 0) { | |
1917 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1918 | break; | |
1919 | } | |
1920 | ||
1921 | nr_pages = 0; | |
1922 | for (i = 0; i < found_pages; i++) { | |
1923 | page = wdata->pages[i]; | |
37c0eb46 SF |
1924 | /* |
1925 | * At this point we hold neither mapping->tree_lock nor | |
1926 | * lock on the page itself: the page may be truncated or | |
1927 | * invalidated (changing page->mapping to NULL), or even | |
1928 | * swizzled back from swapper_space to tmpfs file | |
1929 | * mapping | |
1930 | */ | |
1931 | ||
c3d17b63 | 1932 | if (nr_pages == 0) |
37c0eb46 | 1933 | lock_page(page); |
529ae9aa | 1934 | else if (!trylock_page(page)) |
37c0eb46 SF |
1935 | break; |
1936 | ||
1937 | if (unlikely(page->mapping != mapping)) { | |
1938 | unlock_page(page); | |
1939 | break; | |
1940 | } | |
1941 | ||
111ebb6e | 1942 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1943 | done = true; |
37c0eb46 SF |
1944 | unlock_page(page); |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | if (next && (page->index != next)) { | |
1949 | /* Not next consecutive page */ | |
1950 | unlock_page(page); | |
1951 | break; | |
1952 | } | |
1953 | ||
1954 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1955 | wait_on_page_writeback(page); | |
1956 | ||
1957 | if (PageWriteback(page) || | |
cb876f45 | 1958 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1959 | unlock_page(page); |
1960 | break; | |
1961 | } | |
84d2f07e | 1962 | |
cb876f45 LT |
1963 | /* |
1964 | * This actually clears the dirty bit in the radix tree. | |
1965 | * See cifs_writepage() for more commentary. | |
1966 | */ | |
1967 | set_page_writeback(page); | |
1968 | ||
3a98b861 | 1969 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1970 | done = true; |
84d2f07e | 1971 | unlock_page(page); |
cb876f45 | 1972 | end_page_writeback(page); |
84d2f07e SF |
1973 | break; |
1974 | } | |
1975 | ||
c3d17b63 JL |
1976 | wdata->pages[i] = page; |
1977 | next = page->index + 1; | |
1978 | ++nr_pages; | |
1979 | } | |
37c0eb46 | 1980 | |
c3d17b63 JL |
1981 | /* reset index to refind any pages skipped */ |
1982 | if (nr_pages == 0) | |
1983 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1984 | |
c3d17b63 JL |
1985 | /* put any pages we aren't going to use */ |
1986 | for (i = nr_pages; i < found_pages; i++) { | |
1987 | page_cache_release(wdata->pages[i]); | |
1988 | wdata->pages[i] = NULL; | |
1989 | } | |
37c0eb46 | 1990 | |
c3d17b63 JL |
1991 | /* nothing to write? */ |
1992 | if (nr_pages == 0) { | |
1993 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1994 | continue; | |
37c0eb46 | 1995 | } |
fbec9ab9 | 1996 | |
c3d17b63 JL |
1997 | wdata->sync_mode = wbc->sync_mode; |
1998 | wdata->nr_pages = nr_pages; | |
1999 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
2000 | wdata->pagesz = PAGE_CACHE_SIZE; |
2001 | wdata->tailsz = | |
3a98b861 JL |
2002 | min(i_size_read(mapping->host) - |
2003 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
2004 | (loff_t)PAGE_CACHE_SIZE); |
2005 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
2006 | wdata->tailsz; | |
941b853d | 2007 | |
c3d17b63 JL |
2008 | do { |
2009 | if (wdata->cfile != NULL) | |
2010 | cifsFileInfo_put(wdata->cfile); | |
2011 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
2012 | false); | |
2013 | if (!wdata->cfile) { | |
2014 | cERROR(1, "No writable handles for inode"); | |
2015 | rc = -EBADF; | |
2016 | break; | |
941b853d | 2017 | } |
fe5f5d2e | 2018 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
2019 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
2020 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 2021 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 2022 | |
c3d17b63 JL |
2023 | for (i = 0; i < nr_pages; ++i) |
2024 | unlock_page(wdata->pages[i]); | |
f3983c21 | 2025 | |
c3d17b63 JL |
2026 | /* send failure -- clean up the mess */ |
2027 | if (rc != 0) { | |
2028 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2029 | if (rc == -EAGAIN) |
c3d17b63 JL |
2030 | redirty_page_for_writepage(wbc, |
2031 | wdata->pages[i]); | |
2032 | else | |
2033 | SetPageError(wdata->pages[i]); | |
2034 | end_page_writeback(wdata->pages[i]); | |
2035 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2036 | } |
941b853d JL |
2037 | if (rc != -EAGAIN) |
2038 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2039 | } |
2040 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2041 | |
c3d17b63 JL |
2042 | wbc->nr_to_write -= nr_pages; |
2043 | if (wbc->nr_to_write <= 0) | |
2044 | done = true; | |
b066a48c | 2045 | |
c3d17b63 | 2046 | index = next; |
37c0eb46 | 2047 | } |
c3d17b63 | 2048 | |
37c0eb46 SF |
2049 | if (!scanned && !done) { |
2050 | /* | |
2051 | * We hit the last page and there is more work to be done: wrap | |
2052 | * back to the start of the file | |
2053 | */ | |
c3d17b63 | 2054 | scanned = true; |
37c0eb46 SF |
2055 | index = 0; |
2056 | goto retry; | |
2057 | } | |
c3d17b63 | 2058 | |
111ebb6e | 2059 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2060 | mapping->writeback_index = index; |
2061 | ||
1da177e4 LT |
2062 | return rc; |
2063 | } | |
1da177e4 | 2064 | |
9ad1506b PS |
2065 | static int |
2066 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2067 | { |
9ad1506b | 2068 | int rc; |
6d5786a3 | 2069 | unsigned int xid; |
1da177e4 | 2070 | |
6d5786a3 | 2071 | xid = get_xid(); |
1da177e4 LT |
2072 | /* BB add check for wbc flags */ |
2073 | page_cache_get(page); | |
ad7a2926 | 2074 | if (!PageUptodate(page)) |
b6b38f70 | 2075 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
2076 | |
2077 | /* | |
2078 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2079 | * | |
2080 | * A writepage() implementation always needs to do either this, | |
2081 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2082 | * the case of a failure. | |
2083 | * | |
2084 | * Just unlocking the page will cause the radix tree tag-bits | |
2085 | * to fail to update with the state of the page correctly. | |
2086 | */ | |
fb8c4b14 | 2087 | set_page_writeback(page); |
9ad1506b | 2088 | retry_write: |
1da177e4 | 2089 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2090 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2091 | goto retry_write; | |
2092 | else if (rc == -EAGAIN) | |
2093 | redirty_page_for_writepage(wbc, page); | |
2094 | else if (rc != 0) | |
2095 | SetPageError(page); | |
2096 | else | |
2097 | SetPageUptodate(page); | |
cb876f45 LT |
2098 | end_page_writeback(page); |
2099 | page_cache_release(page); | |
6d5786a3 | 2100 | free_xid(xid); |
1da177e4 LT |
2101 | return rc; |
2102 | } | |
2103 | ||
9ad1506b PS |
2104 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2105 | { | |
2106 | int rc = cifs_writepage_locked(page, wbc); | |
2107 | unlock_page(page); | |
2108 | return rc; | |
2109 | } | |
2110 | ||
d9414774 NP |
2111 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2112 | loff_t pos, unsigned len, unsigned copied, | |
2113 | struct page *page, void *fsdata) | |
1da177e4 | 2114 | { |
d9414774 NP |
2115 | int rc; |
2116 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2117 | struct cifsFileInfo *cfile = file->private_data; |
2118 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2119 | __u32 pid; | |
2120 | ||
2121 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2122 | pid = cfile->pid; | |
2123 | else | |
2124 | pid = current->tgid; | |
1da177e4 | 2125 | |
b6b38f70 JP |
2126 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2127 | page, pos, copied); | |
d9414774 | 2128 | |
a98ee8c1 JL |
2129 | if (PageChecked(page)) { |
2130 | if (copied == len) | |
2131 | SetPageUptodate(page); | |
2132 | ClearPageChecked(page); | |
2133 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2134 | SetPageUptodate(page); |
ad7a2926 | 2135 | |
1da177e4 | 2136 | if (!PageUptodate(page)) { |
d9414774 NP |
2137 | char *page_data; |
2138 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2139 | unsigned int xid; |
d9414774 | 2140 | |
6d5786a3 | 2141 | xid = get_xid(); |
1da177e4 LT |
2142 | /* this is probably better than directly calling |
2143 | partialpage_write since in this function the file handle is | |
2144 | known which we might as well leverage */ | |
2145 | /* BB check if anything else missing out of ppw | |
2146 | such as updating last write time */ | |
2147 | page_data = kmap(page); | |
d4ffff1f | 2148 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2149 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2150 | kunmap(page); |
d9414774 | 2151 | |
6d5786a3 | 2152 | free_xid(xid); |
fb8c4b14 | 2153 | } else { |
d9414774 NP |
2154 | rc = copied; |
2155 | pos += copied; | |
ca8aa29c | 2156 | set_page_dirty(page); |
1da177e4 LT |
2157 | } |
2158 | ||
d9414774 NP |
2159 | if (rc > 0) { |
2160 | spin_lock(&inode->i_lock); | |
2161 | if (pos > inode->i_size) | |
2162 | i_size_write(inode, pos); | |
2163 | spin_unlock(&inode->i_lock); | |
2164 | } | |
2165 | ||
2166 | unlock_page(page); | |
2167 | page_cache_release(page); | |
2168 | ||
1da177e4 LT |
2169 | return rc; |
2170 | } | |
2171 | ||
02c24a82 JB |
2172 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2173 | int datasync) | |
1da177e4 | 2174 | { |
6d5786a3 | 2175 | unsigned int xid; |
1da177e4 | 2176 | int rc = 0; |
96daf2b0 | 2177 | struct cifs_tcon *tcon; |
1d8c4c00 | 2178 | struct TCP_Server_Info *server; |
c21dfb69 | 2179 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2180 | struct inode *inode = file_inode(file); |
8be7e6ba | 2181 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2182 | |
02c24a82 JB |
2183 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2184 | if (rc) | |
2185 | return rc; | |
2186 | mutex_lock(&inode->i_mutex); | |
2187 | ||
6d5786a3 | 2188 | xid = get_xid(); |
1da177e4 | 2189 | |
b6b38f70 | 2190 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2191 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2192 | |
6feb9891 PS |
2193 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2194 | rc = cifs_invalidate_mapping(inode); | |
2195 | if (rc) { | |
2196 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2197 | rc = 0; /* don't care about it in fsync */ | |
2198 | } | |
2199 | } | |
eb4b756b | 2200 | |
8be7e6ba | 2201 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2202 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2203 | server = tcon->ses->server; | |
2204 | if (server->ops->flush) | |
2205 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2206 | else | |
2207 | rc = -ENOSYS; | |
2208 | } | |
8be7e6ba | 2209 | |
6d5786a3 | 2210 | free_xid(xid); |
02c24a82 | 2211 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2212 | return rc; |
2213 | } | |
2214 | ||
02c24a82 | 2215 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2216 | { |
6d5786a3 | 2217 | unsigned int xid; |
8be7e6ba | 2218 | int rc = 0; |
96daf2b0 | 2219 | struct cifs_tcon *tcon; |
1d8c4c00 | 2220 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2221 | struct cifsFileInfo *smbfile = file->private_data; |
2222 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2223 | struct inode *inode = file->f_mapping->host; |
2224 | ||
2225 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2226 | if (rc) | |
2227 | return rc; | |
2228 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2229 | |
6d5786a3 | 2230 | xid = get_xid(); |
8be7e6ba PS |
2231 | |
2232 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2233 | file->f_path.dentry->d_name.name, datasync); | |
2234 | ||
2235 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2236 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2237 | server = tcon->ses->server; | |
2238 | if (server->ops->flush) | |
2239 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2240 | else | |
2241 | rc = -ENOSYS; | |
2242 | } | |
b298f223 | 2243 | |
6d5786a3 | 2244 | free_xid(xid); |
02c24a82 | 2245 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2246 | return rc; |
2247 | } | |
2248 | ||
1da177e4 LT |
2249 | /* |
2250 | * As file closes, flush all cached write data for this inode checking | |
2251 | * for write behind errors. | |
2252 | */ | |
75e1fcc0 | 2253 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2254 | { |
496ad9aa | 2255 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2256 | int rc = 0; |
2257 | ||
eb4b756b | 2258 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2259 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2260 | |
b6b38f70 | 2261 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2262 | |
2263 | return rc; | |
2264 | } | |
2265 | ||
72432ffc PS |
2266 | static int |
2267 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2268 | { | |
2269 | int rc = 0; | |
2270 | unsigned long i; | |
2271 | ||
2272 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2273 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2274 | if (!pages[i]) { |
2275 | /* | |
2276 | * save number of pages we have already allocated and | |
2277 | * return with ENOMEM error | |
2278 | */ | |
2279 | num_pages = i; | |
2280 | rc = -ENOMEM; | |
e94f7ba1 | 2281 | break; |
72432ffc PS |
2282 | } |
2283 | } | |
2284 | ||
e94f7ba1 JL |
2285 | if (rc) { |
2286 | for (i = 0; i < num_pages; i++) | |
2287 | put_page(pages[i]); | |
2288 | } | |
72432ffc PS |
2289 | return rc; |
2290 | } | |
2291 | ||
2292 | static inline | |
2293 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2294 | { | |
2295 | size_t num_pages; | |
2296 | size_t clen; | |
2297 | ||
2298 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2299 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2300 | |
2301 | if (cur_len) | |
2302 | *cur_len = clen; | |
2303 | ||
2304 | return num_pages; | |
2305 | } | |
2306 | ||
da82f7e7 JL |
2307 | static void |
2308 | cifs_uncached_writev_complete(struct work_struct *work) | |
2309 | { | |
2310 | int i; | |
2311 | struct cifs_writedata *wdata = container_of(work, | |
2312 | struct cifs_writedata, work); | |
2313 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2314 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2315 | ||
2316 | spin_lock(&inode->i_lock); | |
2317 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2318 | if (cifsi->server_eof > inode->i_size) | |
2319 | i_size_write(inode, cifsi->server_eof); | |
2320 | spin_unlock(&inode->i_lock); | |
2321 | ||
2322 | complete(&wdata->done); | |
2323 | ||
2324 | if (wdata->result != -EAGAIN) { | |
2325 | for (i = 0; i < wdata->nr_pages; i++) | |
2326 | put_page(wdata->pages[i]); | |
2327 | } | |
2328 | ||
2329 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2330 | } | |
2331 | ||
2332 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2333 | static int | |
2334 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2335 | { | |
2336 | int rc; | |
c9de5c80 PS |
2337 | struct TCP_Server_Info *server; |
2338 | ||
2339 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2340 | |
2341 | do { | |
2342 | if (wdata->cfile->invalidHandle) { | |
2343 | rc = cifs_reopen_file(wdata->cfile, false); | |
2344 | if (rc != 0) | |
2345 | continue; | |
2346 | } | |
c9de5c80 | 2347 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2348 | } while (rc == -EAGAIN); |
2349 | ||
2350 | return rc; | |
2351 | } | |
2352 | ||
72432ffc PS |
2353 | static ssize_t |
2354 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2355 | unsigned long nr_segs, loff_t *poffset) | |
2356 | { | |
da82f7e7 | 2357 | unsigned long nr_pages, i; |
76429c14 PS |
2358 | size_t copied, len, cur_len; |
2359 | ssize_t total_written = 0; | |
3af9d8f2 | 2360 | loff_t offset; |
72432ffc | 2361 | struct iov_iter it; |
72432ffc | 2362 | struct cifsFileInfo *open_file; |
da82f7e7 | 2363 | struct cifs_tcon *tcon; |
72432ffc | 2364 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2365 | struct cifs_writedata *wdata, *tmp; |
2366 | struct list_head wdata_list; | |
2367 | int rc; | |
2368 | pid_t pid; | |
72432ffc PS |
2369 | |
2370 | len = iov_length(iov, nr_segs); | |
2371 | if (!len) | |
2372 | return 0; | |
2373 | ||
2374 | rc = generic_write_checks(file, poffset, &len, 0); | |
2375 | if (rc) | |
2376 | return rc; | |
2377 | ||
da82f7e7 | 2378 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2379 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2380 | open_file = file->private_data; |
da82f7e7 | 2381 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2382 | |
2383 | if (!tcon->ses->server->ops->async_writev) | |
2384 | return -ENOSYS; | |
2385 | ||
3af9d8f2 | 2386 | offset = *poffset; |
d4ffff1f PS |
2387 | |
2388 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2389 | pid = open_file->pid; | |
2390 | else | |
2391 | pid = current->tgid; | |
2392 | ||
72432ffc | 2393 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2394 | do { |
da82f7e7 JL |
2395 | size_t save_len; |
2396 | ||
2397 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2398 | wdata = cifs_writedata_alloc(nr_pages, | |
2399 | cifs_uncached_writev_complete); | |
2400 | if (!wdata) { | |
2401 | rc = -ENOMEM; | |
2402 | break; | |
2403 | } | |
2404 | ||
2405 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2406 | if (rc) { | |
2407 | kfree(wdata); | |
2408 | break; | |
2409 | } | |
2410 | ||
2411 | save_len = cur_len; | |
2412 | for (i = 0; i < nr_pages; i++) { | |
2413 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2414 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2415 | 0, copied); | |
72432ffc PS |
2416 | cur_len -= copied; |
2417 | iov_iter_advance(&it, copied); | |
72432ffc | 2418 | } |
72432ffc PS |
2419 | cur_len = save_len - cur_len; |
2420 | ||
da82f7e7 JL |
2421 | wdata->sync_mode = WB_SYNC_ALL; |
2422 | wdata->nr_pages = nr_pages; | |
2423 | wdata->offset = (__u64)offset; | |
2424 | wdata->cfile = cifsFileInfo_get(open_file); | |
2425 | wdata->pid = pid; | |
2426 | wdata->bytes = cur_len; | |
eddb079d JL |
2427 | wdata->pagesz = PAGE_SIZE; |
2428 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2429 | rc = cifs_uncached_retry_writev(wdata); |
2430 | if (rc) { | |
2431 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2432 | break; |
2433 | } | |
2434 | ||
da82f7e7 JL |
2435 | list_add_tail(&wdata->list, &wdata_list); |
2436 | offset += cur_len; | |
2437 | len -= cur_len; | |
72432ffc PS |
2438 | } while (len > 0); |
2439 | ||
da82f7e7 JL |
2440 | /* |
2441 | * If at least one write was successfully sent, then discard any rc | |
2442 | * value from the later writes. If the other write succeeds, then | |
2443 | * we'll end up returning whatever was written. If it fails, then | |
2444 | * we'll get a new rc value from that. | |
2445 | */ | |
2446 | if (!list_empty(&wdata_list)) | |
2447 | rc = 0; | |
2448 | ||
2449 | /* | |
2450 | * Wait for and collect replies for any successful sends in order of | |
2451 | * increasing offset. Once an error is hit or we get a fatal signal | |
2452 | * while waiting, then return without waiting for any more replies. | |
2453 | */ | |
2454 | restart_loop: | |
2455 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2456 | if (!rc) { | |
2457 | /* FIXME: freezable too? */ | |
2458 | rc = wait_for_completion_killable(&wdata->done); | |
2459 | if (rc) | |
2460 | rc = -EINTR; | |
2461 | else if (wdata->result) | |
2462 | rc = wdata->result; | |
2463 | else | |
2464 | total_written += wdata->bytes; | |
2465 | ||
2466 | /* resend call if it's a retryable error */ | |
2467 | if (rc == -EAGAIN) { | |
2468 | rc = cifs_uncached_retry_writev(wdata); | |
2469 | goto restart_loop; | |
2470 | } | |
2471 | } | |
2472 | list_del_init(&wdata->list); | |
2473 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2474 | } |
2475 | ||
da82f7e7 JL |
2476 | if (total_written > 0) |
2477 | *poffset += total_written; | |
72432ffc | 2478 | |
da82f7e7 JL |
2479 | cifs_stats_bytes_written(tcon, total_written); |
2480 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2481 | } |
2482 | ||
0b81c1c4 | 2483 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2484 | unsigned long nr_segs, loff_t pos) |
2485 | { | |
2486 | ssize_t written; | |
2487 | struct inode *inode; | |
2488 | ||
496ad9aa | 2489 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2490 | |
2491 | /* | |
2492 | * BB - optimize the way when signing is disabled. We can drop this | |
2493 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2494 | * write request. | |
2495 | */ | |
2496 | ||
2497 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2498 | if (written > 0) { | |
2499 | CIFS_I(inode)->invalid_mapping = true; | |
2500 | iocb->ki_pos = pos; | |
2501 | } | |
2502 | ||
2503 | return written; | |
2504 | } | |
2505 | ||
579f9053 | 2506 | static ssize_t |
ca8aa29c PS |
2507 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, |
2508 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2509 | { |
579f9053 PS |
2510 | struct file *file = iocb->ki_filp; |
2511 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2512 | struct inode *inode = file->f_mapping->host; | |
2513 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2514 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2515 | ssize_t rc = -EACCES; | |
72432ffc | 2516 | |
579f9053 | 2517 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2518 | |
579f9053 PS |
2519 | sb_start_write(inode->i_sb); |
2520 | ||
2521 | /* | |
2522 | * We need to hold the sem to be sure nobody modifies lock list | |
2523 | * with a brlock that prevents writing. | |
2524 | */ | |
2525 | down_read(&cinode->lock_sem); | |
2526 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2527 | server->vals->exclusive_lock_type, NULL, | |
081c0414 | 2528 | CIFS_WRITE_OP)) { |
579f9053 PS |
2529 | mutex_lock(&inode->i_mutex); |
2530 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
ca8aa29c | 2531 | &iocb->ki_pos); |
579f9053 PS |
2532 | mutex_unlock(&inode->i_mutex); |
2533 | } | |
2534 | ||
2535 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2536 | ssize_t err; | |
2537 | ||
2538 | err = generic_write_sync(file, pos, rc); | |
2539 | if (err < 0 && rc > 0) | |
2540 | rc = err; | |
2541 | } | |
2542 | ||
2543 | up_read(&cinode->lock_sem); | |
2544 | sb_end_write(inode->i_sb); | |
2545 | return rc; | |
2546 | } | |
2547 | ||
2548 | ssize_t | |
2549 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2550 | unsigned long nr_segs, loff_t pos) | |
2551 | { | |
496ad9aa | 2552 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2553 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2554 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2555 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2556 | iocb->ki_filp->private_data; | |
2557 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2558 | ssize_t written; |
ca8aa29c | 2559 | |
88cf75aa PS |
2560 | if (cinode->clientCanCacheAll) { |
2561 | if (cap_unix(tcon->ses) && | |
2562 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
2563 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2564 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2565 | return cifs_writev(iocb, iov, nr_segs, pos); | |
25078105 | 2566 | } |
25078105 | 2567 | /* |
ca8aa29c PS |
2568 | * For non-oplocked files in strict cache mode we need to write the data |
2569 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2570 | * affected pages because it may cause a error with mandatory locks on | |
2571 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2572 | */ |
88cf75aa PS |
2573 | written = cifs_user_writev(iocb, iov, nr_segs, pos); |
2574 | if (written > 0 && cinode->clientCanCacheRead) { | |
2575 | /* | |
2576 | * Windows 7 server can delay breaking level2 oplock if a write | |
2577 | * request comes - break it on the client to prevent reading | |
2578 | * an old data. | |
2579 | */ | |
2580 | cifs_invalidate_mapping(inode); | |
2581 | cFYI(1, "Set no oplock for inode=%p after a write operation", | |
2582 | inode); | |
2583 | cinode->clientCanCacheRead = false; | |
2584 | } | |
2585 | return written; | |
72432ffc PS |
2586 | } |
2587 | ||
0471ca3f | 2588 | static struct cifs_readdata * |
f4e49cd2 | 2589 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2590 | { |
2591 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2592 | |
c5fab6f4 JL |
2593 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2594 | GFP_KERNEL); | |
0471ca3f | 2595 | if (rdata != NULL) { |
6993f74a | 2596 | kref_init(&rdata->refcount); |
1c892549 JL |
2597 | INIT_LIST_HEAD(&rdata->list); |
2598 | init_completion(&rdata->done); | |
0471ca3f | 2599 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2600 | } |
f4e49cd2 | 2601 | |
0471ca3f JL |
2602 | return rdata; |
2603 | } | |
2604 | ||
6993f74a JL |
2605 | void |
2606 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2607 | { |
6993f74a JL |
2608 | struct cifs_readdata *rdata = container_of(refcount, |
2609 | struct cifs_readdata, refcount); | |
2610 | ||
2611 | if (rdata->cfile) | |
2612 | cifsFileInfo_put(rdata->cfile); | |
2613 | ||
0471ca3f JL |
2614 | kfree(rdata); |
2615 | } | |
2616 | ||
1c892549 | 2617 | static int |
c5fab6f4 | 2618 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2619 | { |
2620 | int rc = 0; | |
c5fab6f4 | 2621 | struct page *page; |
1c892549 JL |
2622 | unsigned int i; |
2623 | ||
c5fab6f4 | 2624 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2625 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2626 | if (!page) { | |
2627 | rc = -ENOMEM; | |
2628 | break; | |
2629 | } | |
c5fab6f4 | 2630 | rdata->pages[i] = page; |
1c892549 JL |
2631 | } |
2632 | ||
2633 | if (rc) { | |
c5fab6f4 JL |
2634 | for (i = 0; i < nr_pages; i++) { |
2635 | put_page(rdata->pages[i]); | |
2636 | rdata->pages[i] = NULL; | |
1c892549 JL |
2637 | } |
2638 | } | |
2639 | return rc; | |
2640 | } | |
2641 | ||
2642 | static void | |
2643 | cifs_uncached_readdata_release(struct kref *refcount) | |
2644 | { | |
1c892549 JL |
2645 | struct cifs_readdata *rdata = container_of(refcount, |
2646 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2647 | unsigned int i; |
1c892549 | 2648 | |
c5fab6f4 JL |
2649 | for (i = 0; i < rdata->nr_pages; i++) { |
2650 | put_page(rdata->pages[i]); | |
2651 | rdata->pages[i] = NULL; | |
1c892549 JL |
2652 | } |
2653 | cifs_readdata_release(refcount); | |
2654 | } | |
2655 | ||
2a1bb138 JL |
2656 | static int |
2657 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2658 | { | |
2659 | int rc; | |
fc9c5966 PS |
2660 | struct TCP_Server_Info *server; |
2661 | ||
2662 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2663 | |
2664 | do { | |
2665 | if (rdata->cfile->invalidHandle) { | |
2666 | rc = cifs_reopen_file(rdata->cfile, true); | |
2667 | if (rc != 0) | |
2668 | continue; | |
2669 | } | |
fc9c5966 | 2670 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2671 | } while (rc == -EAGAIN); |
2672 | ||
2673 | return rc; | |
2674 | } | |
2675 | ||
1c892549 JL |
2676 | /** |
2677 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2678 | * @rdata: the readdata response with list of pages holding data | |
2679 | * @iov: vector in which we should copy the data | |
2680 | * @nr_segs: number of segments in vector | |
2681 | * @offset: offset into file of the first iovec | |
2682 | * @copied: used to return the amount of data copied to the iov | |
2683 | * | |
2684 | * This function copies data from a list of pages in a readdata response into | |
2685 | * an array of iovecs. It will first calculate where the data should go | |
2686 | * based on the info in the readdata and then copy the data into that spot. | |
2687 | */ | |
2688 | static ssize_t | |
2689 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2690 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2691 | { | |
2692 | int rc = 0; | |
2693 | struct iov_iter ii; | |
2694 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2695 | ssize_t remaining = rdata->bytes; |
2696 | unsigned char *pdata; | |
c5fab6f4 | 2697 | unsigned int i; |
1c892549 JL |
2698 | |
2699 | /* set up iov_iter and advance to the correct offset */ | |
2700 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2701 | iov_iter_advance(&ii, pos); | |
2702 | ||
2703 | *copied = 0; | |
c5fab6f4 | 2704 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2705 | ssize_t copy; |
c5fab6f4 | 2706 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2707 | |
2708 | /* copy a whole page or whatever's left */ | |
2709 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2710 | ||
2711 | /* ...but limit it to whatever space is left in the iov */ | |
2712 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2713 | ||
2714 | /* go while there's data to be copied and no errors */ | |
2715 | if (copy && !rc) { | |
2716 | pdata = kmap(page); | |
2717 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2718 | (int)copy); | |
2719 | kunmap(page); | |
2720 | if (!rc) { | |
2721 | *copied += copy; | |
2722 | remaining -= copy; | |
2723 | iov_iter_advance(&ii, copy); | |
2724 | } | |
2725 | } | |
1c892549 JL |
2726 | } |
2727 | ||
2728 | return rc; | |
2729 | } | |
2730 | ||
2731 | static void | |
2732 | cifs_uncached_readv_complete(struct work_struct *work) | |
2733 | { | |
2734 | struct cifs_readdata *rdata = container_of(work, | |
2735 | struct cifs_readdata, work); | |
1c892549 JL |
2736 | |
2737 | complete(&rdata->done); | |
2738 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2739 | } | |
2740 | ||
2741 | static int | |
8321fec4 JL |
2742 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2743 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2744 | { |
8321fec4 | 2745 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2746 | unsigned int i; |
2747 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2748 | struct kvec iov; |
1c892549 | 2749 | |
8321fec4 | 2750 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2751 | for (i = 0; i < nr_pages; i++) { |
2752 | struct page *page = rdata->pages[i]; | |
2753 | ||
8321fec4 | 2754 | if (len >= PAGE_SIZE) { |
1c892549 | 2755 | /* enough data to fill the page */ |
8321fec4 JL |
2756 | iov.iov_base = kmap(page); |
2757 | iov.iov_len = PAGE_SIZE; | |
2758 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2759 | i, iov.iov_base, iov.iov_len); | |
2760 | len -= PAGE_SIZE; | |
2761 | } else if (len > 0) { | |
1c892549 | 2762 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2763 | iov.iov_base = kmap(page); |
2764 | iov.iov_len = len; | |
2765 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2766 | i, iov.iov_base, iov.iov_len); | |
2767 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2768 | rdata->tailsz = len; | |
2769 | len = 0; | |
1c892549 JL |
2770 | } else { |
2771 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2772 | rdata->pages[i] = NULL; |
2773 | rdata->nr_pages--; | |
1c892549 | 2774 | put_page(page); |
8321fec4 | 2775 | continue; |
1c892549 | 2776 | } |
8321fec4 JL |
2777 | |
2778 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2779 | kunmap(page); | |
2780 | if (result < 0) | |
2781 | break; | |
2782 | ||
2783 | total_read += result; | |
1c892549 JL |
2784 | } |
2785 | ||
8321fec4 | 2786 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2787 | } |
2788 | ||
a70307ee PS |
2789 | static ssize_t |
2790 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2791 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2792 | { |
1c892549 | 2793 | ssize_t rc; |
a70307ee | 2794 | size_t len, cur_len; |
1c892549 JL |
2795 | ssize_t total_read = 0; |
2796 | loff_t offset = *poffset; | |
2797 | unsigned int npages; | |
1da177e4 | 2798 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2799 | struct cifs_tcon *tcon; |
1da177e4 | 2800 | struct cifsFileInfo *open_file; |
1c892549 JL |
2801 | struct cifs_readdata *rdata, *tmp; |
2802 | struct list_head rdata_list; | |
2803 | pid_t pid; | |
a70307ee PS |
2804 | |
2805 | if (!nr_segs) | |
2806 | return 0; | |
2807 | ||
2808 | len = iov_length(iov, nr_segs); | |
2809 | if (!len) | |
2810 | return 0; | |
1da177e4 | 2811 | |
1c892549 | 2812 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2813 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2814 | open_file = file->private_data; |
1c892549 | 2815 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2816 | |
fc9c5966 PS |
2817 | if (!tcon->ses->server->ops->async_readv) |
2818 | return -ENOSYS; | |
2819 | ||
d4ffff1f PS |
2820 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2821 | pid = open_file->pid; | |
2822 | else | |
2823 | pid = current->tgid; | |
2824 | ||
ad7a2926 | 2825 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2826 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2827 | |
1c892549 JL |
2828 | do { |
2829 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2830 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2831 | |
1c892549 JL |
2832 | /* allocate a readdata struct */ |
2833 | rdata = cifs_readdata_alloc(npages, | |
2834 | cifs_uncached_readv_complete); | |
2835 | if (!rdata) { | |
2836 | rc = -ENOMEM; | |
2837 | goto error; | |
1da177e4 | 2838 | } |
a70307ee | 2839 | |
c5fab6f4 | 2840 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2841 | if (rc) |
2842 | goto error; | |
2843 | ||
2844 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2845 | rdata->nr_pages = npages; |
1c892549 JL |
2846 | rdata->offset = offset; |
2847 | rdata->bytes = cur_len; | |
2848 | rdata->pid = pid; | |
8321fec4 JL |
2849 | rdata->pagesz = PAGE_SIZE; |
2850 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2851 | |
2852 | rc = cifs_retry_async_readv(rdata); | |
2853 | error: | |
2854 | if (rc) { | |
2855 | kref_put(&rdata->refcount, | |
2856 | cifs_uncached_readdata_release); | |
2857 | break; | |
2858 | } | |
2859 | ||
2860 | list_add_tail(&rdata->list, &rdata_list); | |
2861 | offset += cur_len; | |
2862 | len -= cur_len; | |
2863 | } while (len > 0); | |
2864 | ||
2865 | /* if at least one read request send succeeded, then reset rc */ | |
2866 | if (!list_empty(&rdata_list)) | |
2867 | rc = 0; | |
2868 | ||
2869 | /* the loop below should proceed in the order of increasing offsets */ | |
2870 | restart_loop: | |
2871 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2872 | if (!rc) { | |
2873 | ssize_t copied; | |
2874 | ||
2875 | /* FIXME: freezable sleep too? */ | |
2876 | rc = wait_for_completion_killable(&rdata->done); | |
2877 | if (rc) | |
2878 | rc = -EINTR; | |
2879 | else if (rdata->result) | |
2880 | rc = rdata->result; | |
2881 | else { | |
2882 | rc = cifs_readdata_to_iov(rdata, iov, | |
2883 | nr_segs, *poffset, | |
2884 | &copied); | |
2885 | total_read += copied; | |
2886 | } | |
2887 | ||
2888 | /* resend call if it's a retryable error */ | |
2889 | if (rc == -EAGAIN) { | |
2890 | rc = cifs_retry_async_readv(rdata); | |
2891 | goto restart_loop; | |
1da177e4 | 2892 | } |
1da177e4 | 2893 | } |
1c892549 JL |
2894 | list_del_init(&rdata->list); |
2895 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2896 | } |
a70307ee | 2897 | |
1c892549 JL |
2898 | cifs_stats_bytes_read(tcon, total_read); |
2899 | *poffset += total_read; | |
2900 | ||
09a4707e PS |
2901 | /* mask nodata case */ |
2902 | if (rc == -ENODATA) | |
2903 | rc = 0; | |
2904 | ||
1c892549 | 2905 | return total_read ? total_read : rc; |
1da177e4 LT |
2906 | } |
2907 | ||
0b81c1c4 | 2908 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2909 | unsigned long nr_segs, loff_t pos) |
2910 | { | |
2911 | ssize_t read; | |
2912 | ||
2913 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2914 | if (read > 0) | |
2915 | iocb->ki_pos = pos; | |
2916 | ||
2917 | return read; | |
2918 | } | |
2919 | ||
579f9053 PS |
2920 | ssize_t |
2921 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2922 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2923 | { |
496ad9aa | 2924 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2925 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2926 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2927 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2928 | iocb->ki_filp->private_data; | |
2929 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2930 | int rc = -EACCES; | |
a70307ee PS |
2931 | |
2932 | /* | |
2933 | * In strict cache mode we need to read from the server all the time | |
2934 | * if we don't have level II oplock because the server can delay mtime | |
2935 | * change - so we can't make a decision about inode invalidating. | |
2936 | * And we can also fail with pagereading if there are mandatory locks | |
2937 | * on pages affected by this read but not on the region from pos to | |
2938 | * pos+len-1. | |
2939 | */ | |
579f9053 PS |
2940 | if (!cinode->clientCanCacheRead) |
2941 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2942 | |
579f9053 PS |
2943 | if (cap_unix(tcon->ses) && |
2944 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2945 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2946 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2947 | ||
2948 | /* | |
2949 | * We need to hold the sem to be sure nobody modifies lock list | |
2950 | * with a brlock that prevents reading. | |
2951 | */ | |
2952 | down_read(&cinode->lock_sem); | |
2953 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2954 | tcon->ses->server->vals->shared_lock_type, | |
081c0414 | 2955 | NULL, CIFS_READ_OP)) |
579f9053 PS |
2956 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); |
2957 | up_read(&cinode->lock_sem); | |
2958 | return rc; | |
a70307ee | 2959 | } |
1da177e4 | 2960 | |
f9c6e234 PS |
2961 | static ssize_t |
2962 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2963 | { |
2964 | int rc = -EACCES; | |
2965 | unsigned int bytes_read = 0; | |
2966 | unsigned int total_read; | |
2967 | unsigned int current_read_size; | |
5eba8ab3 | 2968 | unsigned int rsize; |
1da177e4 | 2969 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2970 | struct cifs_tcon *tcon; |
f9c6e234 | 2971 | struct TCP_Server_Info *server; |
6d5786a3 | 2972 | unsigned int xid; |
f9c6e234 | 2973 | char *cur_offset; |
1da177e4 | 2974 | struct cifsFileInfo *open_file; |
d4ffff1f | 2975 | struct cifs_io_parms io_parms; |
ec637e3f | 2976 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2977 | __u32 pid; |
1da177e4 | 2978 | |
6d5786a3 | 2979 | xid = get_xid(); |
e6a00296 | 2980 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2981 | |
5eba8ab3 JL |
2982 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2983 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2984 | ||
1da177e4 | 2985 | if (file->private_data == NULL) { |
0f3bc09e | 2986 | rc = -EBADF; |
6d5786a3 | 2987 | free_xid(xid); |
0f3bc09e | 2988 | return rc; |
1da177e4 | 2989 | } |
c21dfb69 | 2990 | open_file = file->private_data; |
29e20f9c | 2991 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2992 | server = tcon->ses->server; |
2993 | ||
2994 | if (!server->ops->sync_read) { | |
2995 | free_xid(xid); | |
2996 | return -ENOSYS; | |
2997 | } | |
1da177e4 | 2998 | |
d4ffff1f PS |
2999 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3000 | pid = open_file->pid; | |
3001 | else | |
3002 | pid = current->tgid; | |
3003 | ||
1da177e4 | 3004 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 3005 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 3006 | |
f9c6e234 PS |
3007 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3008 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3009 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3010 | /* |
3011 | * For windows me and 9x we do not want to request more than it | |
3012 | * negotiated since it will refuse the read then. | |
3013 | */ | |
3014 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3015 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3016 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3017 | CIFSMaxBufSize); |
f9f5c817 | 3018 | } |
1da177e4 LT |
3019 | rc = -EAGAIN; |
3020 | while (rc == -EAGAIN) { | |
cdff08e7 | 3021 | if (open_file->invalidHandle) { |
15886177 | 3022 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3023 | if (rc != 0) |
3024 | break; | |
3025 | } | |
d4ffff1f | 3026 | io_parms.pid = pid; |
29e20f9c | 3027 | io_parms.tcon = tcon; |
f9c6e234 | 3028 | io_parms.offset = *offset; |
d4ffff1f | 3029 | io_parms.length = current_read_size; |
f9c6e234 PS |
3030 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3031 | &bytes_read, &cur_offset, | |
3032 | &buf_type); | |
1da177e4 LT |
3033 | } |
3034 | if (rc || (bytes_read == 0)) { | |
3035 | if (total_read) { | |
3036 | break; | |
3037 | } else { | |
6d5786a3 | 3038 | free_xid(xid); |
1da177e4 LT |
3039 | return rc; |
3040 | } | |
3041 | } else { | |
29e20f9c | 3042 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3043 | *offset += bytes_read; |
1da177e4 LT |
3044 | } |
3045 | } | |
6d5786a3 | 3046 | free_xid(xid); |
1da177e4 LT |
3047 | return total_read; |
3048 | } | |
3049 | ||
ca83ce3d JL |
3050 | /* |
3051 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3052 | * sure that it doesn't change while being written back. | |
3053 | */ | |
3054 | static int | |
3055 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3056 | { | |
3057 | struct page *page = vmf->page; | |
3058 | ||
3059 | lock_page(page); | |
3060 | return VM_FAULT_LOCKED; | |
3061 | } | |
3062 | ||
3063 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3064 | .fault = filemap_fault, | |
3065 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3066 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3067 | }; |
3068 | ||
7a6a19b1 PS |
3069 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3070 | { | |
3071 | int rc, xid; | |
496ad9aa | 3072 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3073 | |
6d5786a3 | 3074 | xid = get_xid(); |
7a6a19b1 | 3075 | |
6feb9891 PS |
3076 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3077 | rc = cifs_invalidate_mapping(inode); | |
3078 | if (rc) | |
3079 | return rc; | |
3080 | } | |
7a6a19b1 PS |
3081 | |
3082 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3083 | if (rc == 0) |
3084 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3085 | free_xid(xid); |
7a6a19b1 PS |
3086 | return rc; |
3087 | } | |
3088 | ||
1da177e4 LT |
3089 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3090 | { | |
1da177e4 LT |
3091 | int rc, xid; |
3092 | ||
6d5786a3 | 3093 | xid = get_xid(); |
abab095d | 3094 | rc = cifs_revalidate_file(file); |
1da177e4 | 3095 | if (rc) { |
b6b38f70 | 3096 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 3097 | free_xid(xid); |
1da177e4 LT |
3098 | return rc; |
3099 | } | |
3100 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3101 | if (rc == 0) |
3102 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3103 | free_xid(xid); |
1da177e4 LT |
3104 | return rc; |
3105 | } | |
3106 | ||
0471ca3f JL |
3107 | static void |
3108 | cifs_readv_complete(struct work_struct *work) | |
3109 | { | |
c5fab6f4 | 3110 | unsigned int i; |
0471ca3f JL |
3111 | struct cifs_readdata *rdata = container_of(work, |
3112 | struct cifs_readdata, work); | |
0471ca3f | 3113 | |
c5fab6f4 JL |
3114 | for (i = 0; i < rdata->nr_pages; i++) { |
3115 | struct page *page = rdata->pages[i]; | |
3116 | ||
0471ca3f JL |
3117 | lru_cache_add_file(page); |
3118 | ||
3119 | if (rdata->result == 0) { | |
0471ca3f JL |
3120 | flush_dcache_page(page); |
3121 | SetPageUptodate(page); | |
3122 | } | |
3123 | ||
3124 | unlock_page(page); | |
3125 | ||
3126 | if (rdata->result == 0) | |
3127 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3128 | ||
3129 | page_cache_release(page); | |
c5fab6f4 | 3130 | rdata->pages[i] = NULL; |
0471ca3f | 3131 | } |
6993f74a | 3132 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3133 | } |
3134 | ||
8d5ce4d2 | 3135 | static int |
8321fec4 JL |
3136 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3137 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3138 | { |
8321fec4 | 3139 | int total_read = 0, result = 0; |
c5fab6f4 | 3140 | unsigned int i; |
8d5ce4d2 JL |
3141 | u64 eof; |
3142 | pgoff_t eof_index; | |
c5fab6f4 | 3143 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3144 | struct kvec iov; |
8d5ce4d2 JL |
3145 | |
3146 | /* determine the eof that the server (probably) has */ | |
3147 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3148 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
3149 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
3150 | ||
8321fec4 | 3151 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3152 | for (i = 0; i < nr_pages; i++) { |
3153 | struct page *page = rdata->pages[i]; | |
3154 | ||
8321fec4 | 3155 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3156 | /* enough data to fill the page */ |
8321fec4 JL |
3157 | iov.iov_base = kmap(page); |
3158 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 3159 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3160 | i, page->index, iov.iov_base, iov.iov_len); |
3161 | len -= PAGE_CACHE_SIZE; | |
3162 | } else if (len > 0) { | |
8d5ce4d2 | 3163 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3164 | iov.iov_base = kmap(page); |
3165 | iov.iov_len = len; | |
8d5ce4d2 | 3166 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3167 | i, page->index, iov.iov_base, iov.iov_len); |
3168 | memset(iov.iov_base + len, | |
3169 | '\0', PAGE_CACHE_SIZE - len); | |
3170 | rdata->tailsz = len; | |
3171 | len = 0; | |
8d5ce4d2 JL |
3172 | } else if (page->index > eof_index) { |
3173 | /* | |
3174 | * The VFS will not try to do readahead past the | |
3175 | * i_size, but it's possible that we have outstanding | |
3176 | * writes with gaps in the middle and the i_size hasn't | |
3177 | * caught up yet. Populate those with zeroed out pages | |
3178 | * to prevent the VFS from repeatedly attempting to | |
3179 | * fill them until the writes are flushed. | |
3180 | */ | |
3181 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3182 | lru_cache_add_file(page); |
3183 | flush_dcache_page(page); | |
3184 | SetPageUptodate(page); | |
3185 | unlock_page(page); | |
3186 | page_cache_release(page); | |
c5fab6f4 JL |
3187 | rdata->pages[i] = NULL; |
3188 | rdata->nr_pages--; | |
8321fec4 | 3189 | continue; |
8d5ce4d2 JL |
3190 | } else { |
3191 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3192 | lru_cache_add_file(page); |
3193 | unlock_page(page); | |
3194 | page_cache_release(page); | |
c5fab6f4 JL |
3195 | rdata->pages[i] = NULL; |
3196 | rdata->nr_pages--; | |
8321fec4 | 3197 | continue; |
8d5ce4d2 | 3198 | } |
8321fec4 JL |
3199 | |
3200 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3201 | kunmap(page); | |
3202 | if (result < 0) | |
3203 | break; | |
3204 | ||
3205 | total_read += result; | |
8d5ce4d2 JL |
3206 | } |
3207 | ||
8321fec4 | 3208 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3209 | } |
3210 | ||
1da177e4 LT |
3211 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3212 | struct list_head *page_list, unsigned num_pages) | |
3213 | { | |
690c5e31 JL |
3214 | int rc; |
3215 | struct list_head tmplist; | |
3216 | struct cifsFileInfo *open_file = file->private_data; | |
3217 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3218 | unsigned int rsize = cifs_sb->rsize; | |
3219 | pid_t pid; | |
1da177e4 | 3220 | |
690c5e31 JL |
3221 | /* |
3222 | * Give up immediately if rsize is too small to read an entire page. | |
3223 | * The VFS will fall back to readpage. We should never reach this | |
3224 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3225 | * than a cache page. | |
3226 | */ | |
3227 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3228 | return 0; | |
bfa0d75a | 3229 | |
56698236 SJ |
3230 | /* |
3231 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3232 | * immediately if the cookie is negative | |
3233 | */ | |
3234 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3235 | &num_pages); | |
3236 | if (rc == 0) | |
690c5e31 | 3237 | return rc; |
56698236 | 3238 | |
d4ffff1f PS |
3239 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3240 | pid = open_file->pid; | |
3241 | else | |
3242 | pid = current->tgid; | |
3243 | ||
690c5e31 JL |
3244 | rc = 0; |
3245 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3246 | |
690c5e31 JL |
3247 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3248 | mapping, num_pages); | |
3249 | ||
3250 | /* | |
3251 | * Start with the page at end of list and move it to private | |
3252 | * list. Do the same with any following pages until we hit | |
3253 | * the rsize limit, hit an index discontinuity, or run out of | |
3254 | * pages. Issue the async read and then start the loop again | |
3255 | * until the list is empty. | |
3256 | * | |
3257 | * Note that list order is important. The page_list is in | |
3258 | * the order of declining indexes. When we put the pages in | |
3259 | * the rdata->pages, then we want them in increasing order. | |
3260 | */ | |
3261 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3262 | unsigned int i; |
690c5e31 JL |
3263 | unsigned int bytes = PAGE_CACHE_SIZE; |
3264 | unsigned int expected_index; | |
3265 | unsigned int nr_pages = 1; | |
3266 | loff_t offset; | |
3267 | struct page *page, *tpage; | |
3268 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3269 | |
3270 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3271 | |
3272 | /* | |
3273 | * Lock the page and put it in the cache. Since no one else | |
3274 | * should have access to this page, we're safe to simply set | |
3275 | * PG_locked without checking it first. | |
3276 | */ | |
3277 | __set_page_locked(page); | |
3278 | rc = add_to_page_cache_locked(page, mapping, | |
3279 | page->index, GFP_KERNEL); | |
3280 | ||
3281 | /* give up if we can't stick it in the cache */ | |
3282 | if (rc) { | |
3283 | __clear_page_locked(page); | |
3284 | break; | |
3285 | } | |
3286 | ||
3287 | /* move first page to the tmplist */ | |
1da177e4 | 3288 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3289 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3290 | |
690c5e31 JL |
3291 | /* now try and add more pages onto the request */ |
3292 | expected_index = page->index + 1; | |
3293 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3294 | /* discontinuity ? */ | |
3295 | if (page->index != expected_index) | |
fb8c4b14 | 3296 | break; |
690c5e31 JL |
3297 | |
3298 | /* would this page push the read over the rsize? */ | |
3299 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3300 | break; | |
3301 | ||
3302 | __set_page_locked(page); | |
3303 | if (add_to_page_cache_locked(page, mapping, | |
3304 | page->index, GFP_KERNEL)) { | |
3305 | __clear_page_locked(page); | |
3306 | break; | |
3307 | } | |
3308 | list_move_tail(&page->lru, &tmplist); | |
3309 | bytes += PAGE_CACHE_SIZE; | |
3310 | expected_index++; | |
3311 | nr_pages++; | |
1da177e4 | 3312 | } |
690c5e31 | 3313 | |
0471ca3f | 3314 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3315 | if (!rdata) { |
3316 | /* best to give up if we're out of mem */ | |
3317 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3318 | list_del(&page->lru); | |
3319 | lru_cache_add_file(page); | |
3320 | unlock_page(page); | |
3321 | page_cache_release(page); | |
3322 | } | |
3323 | rc = -ENOMEM; | |
3324 | break; | |
3325 | } | |
3326 | ||
6993f74a | 3327 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3328 | rdata->mapping = mapping; |
3329 | rdata->offset = offset; | |
3330 | rdata->bytes = bytes; | |
3331 | rdata->pid = pid; | |
8321fec4 JL |
3332 | rdata->pagesz = PAGE_CACHE_SIZE; |
3333 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3334 | |
3335 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3336 | list_del(&page->lru); | |
3337 | rdata->pages[rdata->nr_pages++] = page; | |
3338 | } | |
690c5e31 | 3339 | |
2a1bb138 | 3340 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3341 | if (rc != 0) { |
c5fab6f4 JL |
3342 | for (i = 0; i < rdata->nr_pages; i++) { |
3343 | page = rdata->pages[i]; | |
690c5e31 JL |
3344 | lru_cache_add_file(page); |
3345 | unlock_page(page); | |
3346 | page_cache_release(page); | |
1da177e4 | 3347 | } |
6993f74a | 3348 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3349 | break; |
3350 | } | |
6993f74a JL |
3351 | |
3352 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3353 | } |
3354 | ||
1da177e4 LT |
3355 | return rc; |
3356 | } | |
3357 | ||
3358 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3359 | loff_t *poffset) | |
3360 | { | |
3361 | char *read_data; | |
3362 | int rc; | |
3363 | ||
56698236 | 3364 | /* Is the page cached? */ |
496ad9aa | 3365 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3366 | if (rc == 0) |
3367 | goto read_complete; | |
3368 | ||
1da177e4 LT |
3369 | page_cache_get(page); |
3370 | read_data = kmap(page); | |
3371 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3372 | |
1da177e4 | 3373 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3374 | |
1da177e4 LT |
3375 | if (rc < 0) |
3376 | goto io_error; | |
3377 | else | |
b6b38f70 | 3378 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3379 | |
496ad9aa AV |
3380 | file_inode(file)->i_atime = |
3381 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3382 | |
1da177e4 LT |
3383 | if (PAGE_CACHE_SIZE > rc) |
3384 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3385 | ||
3386 | flush_dcache_page(page); | |
3387 | SetPageUptodate(page); | |
9dc06558 SJ |
3388 | |
3389 | /* send this page to the cache */ | |
496ad9aa | 3390 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3391 | |
1da177e4 | 3392 | rc = 0; |
fb8c4b14 | 3393 | |
1da177e4 | 3394 | io_error: |
fb8c4b14 | 3395 | kunmap(page); |
1da177e4 | 3396 | page_cache_release(page); |
56698236 SJ |
3397 | |
3398 | read_complete: | |
1da177e4 LT |
3399 | return rc; |
3400 | } | |
3401 | ||
3402 | static int cifs_readpage(struct file *file, struct page *page) | |
3403 | { | |
3404 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3405 | int rc = -EACCES; | |
6d5786a3 | 3406 | unsigned int xid; |
1da177e4 | 3407 | |
6d5786a3 | 3408 | xid = get_xid(); |
1da177e4 LT |
3409 | |
3410 | if (file->private_data == NULL) { | |
0f3bc09e | 3411 | rc = -EBADF; |
6d5786a3 | 3412 | free_xid(xid); |
0f3bc09e | 3413 | return rc; |
1da177e4 LT |
3414 | } |
3415 | ||
ac3aa2f8 | 3416 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3417 | page, (int)offset, (int)offset); |
1da177e4 LT |
3418 | |
3419 | rc = cifs_readpage_worker(file, page, &offset); | |
3420 | ||
3421 | unlock_page(page); | |
3422 | ||
6d5786a3 | 3423 | free_xid(xid); |
1da177e4 LT |
3424 | return rc; |
3425 | } | |
3426 | ||
a403a0a3 SF |
3427 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3428 | { | |
3429 | struct cifsFileInfo *open_file; | |
3430 | ||
4477288a | 3431 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3432 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3433 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3434 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3435 | return 1; |
3436 | } | |
3437 | } | |
4477288a | 3438 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3439 | return 0; |
3440 | } | |
3441 | ||
1da177e4 LT |
3442 | /* We do not want to update the file size from server for inodes |
3443 | open for write - to avoid races with writepage extending | |
3444 | the file - in the future we could consider allowing | |
fb8c4b14 | 3445 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3446 | but this is tricky to do without racing with writebehind |
3447 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3448 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3449 | { |
a403a0a3 | 3450 | if (!cifsInode) |
4b18f2a9 | 3451 | return true; |
50c2f753 | 3452 | |
a403a0a3 SF |
3453 | if (is_inode_writable(cifsInode)) { |
3454 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3455 | struct cifs_sb_info *cifs_sb; |
3456 | ||
c32a0b68 | 3457 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3458 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3459 | /* since no page cache to corrupt on directio |
c32a0b68 | 3460 | we can change size safely */ |
4b18f2a9 | 3461 | return true; |
c32a0b68 SF |
3462 | } |
3463 | ||
fb8c4b14 | 3464 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3465 | return true; |
7ba52631 | 3466 | |
4b18f2a9 | 3467 | return false; |
23e7dd7d | 3468 | } else |
4b18f2a9 | 3469 | return true; |
1da177e4 LT |
3470 | } |
3471 | ||
d9414774 NP |
3472 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3473 | loff_t pos, unsigned len, unsigned flags, | |
3474 | struct page **pagep, void **fsdata) | |
1da177e4 | 3475 | { |
d9414774 NP |
3476 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3477 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3478 | loff_t page_start = pos & PAGE_MASK; |
3479 | loff_t i_size; | |
3480 | struct page *page; | |
3481 | int rc = 0; | |
d9414774 | 3482 | |
b6b38f70 | 3483 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3484 | |
54566b2c | 3485 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3486 | if (!page) { |
3487 | rc = -ENOMEM; | |
3488 | goto out; | |
3489 | } | |
8a236264 | 3490 | |
a98ee8c1 JL |
3491 | if (PageUptodate(page)) |
3492 | goto out; | |
8a236264 | 3493 | |
a98ee8c1 JL |
3494 | /* |
3495 | * If we write a full page it will be up to date, no need to read from | |
3496 | * the server. If the write is short, we'll end up doing a sync write | |
3497 | * instead. | |
3498 | */ | |
3499 | if (len == PAGE_CACHE_SIZE) | |
3500 | goto out; | |
8a236264 | 3501 | |
a98ee8c1 JL |
3502 | /* |
3503 | * optimize away the read when we have an oplock, and we're not | |
3504 | * expecting to use any of the data we'd be reading in. That | |
3505 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3506 | * and the write will cover all of the existing data. | |
3507 | */ | |
3508 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3509 | i_size = i_size_read(mapping->host); | |
3510 | if (page_start >= i_size || | |
3511 | (offset == 0 && (pos + len) >= i_size)) { | |
3512 | zero_user_segments(page, 0, offset, | |
3513 | offset + len, | |
3514 | PAGE_CACHE_SIZE); | |
3515 | /* | |
3516 | * PageChecked means that the parts of the page | |
3517 | * to which we're not writing are considered up | |
3518 | * to date. Once the data is copied to the | |
3519 | * page, it can be set uptodate. | |
3520 | */ | |
3521 | SetPageChecked(page); | |
3522 | goto out; | |
3523 | } | |
3524 | } | |
d9414774 | 3525 | |
a98ee8c1 JL |
3526 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3527 | /* | |
3528 | * might as well read a page, it is fast enough. If we get | |
3529 | * an error, we don't need to return it. cifs_write_end will | |
3530 | * do a sync write instead since PG_uptodate isn't set. | |
3531 | */ | |
3532 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3533 | } else { |
3534 | /* we could try using another file handle if there is one - | |
3535 | but how would we lock it to prevent close of that handle | |
3536 | racing with this read? In any case | |
d9414774 | 3537 | this will be written out by write_end so is fine */ |
1da177e4 | 3538 | } |
a98ee8c1 JL |
3539 | out: |
3540 | *pagep = page; | |
3541 | return rc; | |
1da177e4 LT |
3542 | } |
3543 | ||
85f2d6b4 SJ |
3544 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3545 | { | |
3546 | if (PagePrivate(page)) | |
3547 | return 0; | |
3548 | ||
3549 | return cifs_fscache_release_page(page, gfp); | |
3550 | } | |
3551 | ||
3552 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3553 | { | |
3554 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3555 | ||
3556 | if (offset == 0) | |
3557 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3558 | } | |
3559 | ||
9ad1506b PS |
3560 | static int cifs_launder_page(struct page *page) |
3561 | { | |
3562 | int rc = 0; | |
3563 | loff_t range_start = page_offset(page); | |
3564 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3565 | struct writeback_control wbc = { | |
3566 | .sync_mode = WB_SYNC_ALL, | |
3567 | .nr_to_write = 0, | |
3568 | .range_start = range_start, | |
3569 | .range_end = range_end, | |
3570 | }; | |
3571 | ||
3572 | cFYI(1, "Launder page: %p", page); | |
3573 | ||
3574 | if (clear_page_dirty_for_io(page)) | |
3575 | rc = cifs_writepage_locked(page, &wbc); | |
3576 | ||
3577 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3578 | return rc; | |
3579 | } | |
3580 | ||
9b646972 | 3581 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3582 | { |
3583 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3584 | oplock_break); | |
a5e18bc3 | 3585 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3586 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3587 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3588 | int rc = 0; |
3bc303c2 | 3589 | |
63b7d3a4 PS |
3590 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead && |
3591 | cifs_has_mand_locks(cinode)) { | |
3592 | cFYI(1, "Reset oplock to None for inode=%p due to mand locks", | |
3593 | inode); | |
3594 | cinode->clientCanCacheRead = false; | |
3595 | } | |
3596 | ||
3bc303c2 | 3597 | if (inode && S_ISREG(inode->i_mode)) { |
d54ff732 | 3598 | if (cinode->clientCanCacheRead) |
8737c930 | 3599 | break_lease(inode, O_RDONLY); |
d54ff732 | 3600 | else |
8737c930 | 3601 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3602 | rc = filemap_fdatawrite(inode->i_mapping); |
3603 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3604 | rc = filemap_fdatawait(inode->i_mapping); |
3605 | mapping_set_error(inode->i_mapping, rc); | |
03eca704 | 3606 | cifs_invalidate_mapping(inode); |
3bc303c2 | 3607 | } |
b6b38f70 | 3608 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3609 | } |
3610 | ||
85160e03 PS |
3611 | rc = cifs_push_locks(cfile); |
3612 | if (rc) | |
3613 | cERROR(1, "Push locks rc = %d", rc); | |
3614 | ||
3bc303c2 JL |
3615 | /* |
3616 | * releasing stale oplock after recent reconnect of smb session using | |
3617 | * a now incorrect file handle is not a data integrity issue but do | |
3618 | * not bother sending an oplock release if session to server still is | |
3619 | * disconnected since oplock already released by the server | |
3620 | */ | |
cdff08e7 | 3621 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3622 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3623 | cinode); | |
b6b38f70 | 3624 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3625 | } |
3bc303c2 JL |
3626 | } |
3627 | ||
f5e54d6e | 3628 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3629 | .readpage = cifs_readpage, |
3630 | .readpages = cifs_readpages, | |
3631 | .writepage = cifs_writepage, | |
37c0eb46 | 3632 | .writepages = cifs_writepages, |
d9414774 NP |
3633 | .write_begin = cifs_write_begin, |
3634 | .write_end = cifs_write_end, | |
1da177e4 | 3635 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3636 | .releasepage = cifs_release_page, |
3637 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3638 | .launder_page = cifs_launder_page, |
1da177e4 | 3639 | }; |
273d81d6 DK |
3640 | |
3641 | /* | |
3642 | * cifs_readpages requires the server to support a buffer large enough to | |
3643 | * contain the header plus one complete page of data. Otherwise, we need | |
3644 | * to leave cifs_readpages out of the address space operations. | |
3645 | */ | |
f5e54d6e | 3646 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3647 | .readpage = cifs_readpage, |
3648 | .writepage = cifs_writepage, | |
3649 | .writepages = cifs_writepages, | |
d9414774 NP |
3650 | .write_begin = cifs_write_begin, |
3651 | .write_end = cifs_write_end, | |
273d81d6 | 3652 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3653 | .releasepage = cifs_release_page, |
3654 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3655 | .launder_page = cifs_launder_page, |
273d81d6 | 3656 | }; |