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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 | |
24261fc2 MG |
303 | cifs_sb_active(inode->i_sb); |
304 | ||
63b7d3a4 PS |
305 | /* |
306 | * If the server returned a read oplock and we have mandatory brlocks, | |
307 | * set oplock level to None. | |
308 | */ | |
309 | if (oplock == server->vals->oplock_read && | |
310 | cifs_has_mand_locks(cinode)) { | |
311 | cFYI(1, "Reset oplock val from read to None due to mand locks"); | |
312 | oplock = 0; | |
313 | } | |
314 | ||
4477288a | 315 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 316 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
317 | oplock = fid->pending_open->oplock; |
318 | list_del(&fid->pending_open->olist); | |
319 | ||
63b7d3a4 | 320 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
321 | |
322 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
323 | /* if readable file instance put first in list*/ |
324 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 325 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 326 | else |
4b4de76e | 327 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 328 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 329 | |
4b4de76e PS |
330 | file->private_data = cfile; |
331 | return cfile; | |
15ecb436 JL |
332 | } |
333 | ||
764a1b1a JL |
334 | struct cifsFileInfo * |
335 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
336 | { | |
337 | spin_lock(&cifs_file_list_lock); | |
338 | cifsFileInfo_get_locked(cifs_file); | |
339 | spin_unlock(&cifs_file_list_lock); | |
340 | return cifs_file; | |
341 | } | |
342 | ||
cdff08e7 SF |
343 | /* |
344 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
345 | * the filehandle out on the server. Must be called without holding |
346 | * cifs_file_list_lock. | |
cdff08e7 | 347 | */ |
b33879aa JL |
348 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
349 | { | |
e66673e3 | 350 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 351 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 352 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 353 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
354 | struct super_block *sb = inode->i_sb; |
355 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 356 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
357 | struct cifs_fid fid; |
358 | struct cifs_pending_open open; | |
cdff08e7 SF |
359 | |
360 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 361 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
362 | spin_unlock(&cifs_file_list_lock); |
363 | return; | |
364 | } | |
365 | ||
233839b1 PS |
366 | if (server->ops->get_lease_key) |
367 | server->ops->get_lease_key(inode, &fid); | |
368 | ||
369 | /* store open in pending opens to make sure we don't miss lease break */ | |
370 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
371 | ||
cdff08e7 SF |
372 | /* remove it from the lists */ |
373 | list_del(&cifs_file->flist); | |
374 | list_del(&cifs_file->tlist); | |
375 | ||
376 | if (list_empty(&cifsi->openFileList)) { | |
377 | cFYI(1, "closing last open instance for inode %p", | |
378 | cifs_file->dentry->d_inode); | |
25364138 PS |
379 | /* |
380 | * In strict cache mode we need invalidate mapping on the last | |
381 | * close because it may cause a error when we open this file | |
382 | * again and get at least level II oplock. | |
383 | */ | |
4f8ba8a0 PS |
384 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
385 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 386 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
387 | } |
388 | spin_unlock(&cifs_file_list_lock); | |
389 | ||
ad635942 JL |
390 | cancel_work_sync(&cifs_file->oplock_break); |
391 | ||
cdff08e7 | 392 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 393 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 394 | unsigned int xid; |
0ff78a22 | 395 | |
6d5786a3 | 396 | xid = get_xid(); |
0ff78a22 | 397 | if (server->ops->close) |
760ad0ca PS |
398 | server->ops->close(xid, tcon, &cifs_file->fid); |
399 | _free_xid(xid); | |
cdff08e7 SF |
400 | } |
401 | ||
233839b1 PS |
402 | cifs_del_pending_open(&open); |
403 | ||
f45d3416 PS |
404 | /* |
405 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
406 | * is closed anyway. |
407 | */ | |
1b4b55a1 | 408 | down_write(&cifsi->lock_sem); |
f45d3416 | 409 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 410 | list_del(&li->llist); |
85160e03 | 411 | cifs_del_lock_waiters(li); |
cdff08e7 | 412 | kfree(li); |
b33879aa | 413 | } |
f45d3416 PS |
414 | list_del(&cifs_file->llist->llist); |
415 | kfree(cifs_file->llist); | |
1b4b55a1 | 416 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
417 | |
418 | cifs_put_tlink(cifs_file->tlink); | |
419 | dput(cifs_file->dentry); | |
24261fc2 | 420 | cifs_sb_deactive(sb); |
cdff08e7 | 421 | kfree(cifs_file); |
b33879aa JL |
422 | } |
423 | ||
1da177e4 | 424 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 425 | |
1da177e4 LT |
426 | { |
427 | int rc = -EACCES; | |
6d5786a3 | 428 | unsigned int xid; |
590a3fe0 | 429 | __u32 oplock; |
1da177e4 | 430 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 431 | struct TCP_Server_Info *server; |
96daf2b0 | 432 | struct cifs_tcon *tcon; |
7ffec372 | 433 | struct tcon_link *tlink; |
fb1214e4 | 434 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 435 | char *full_path = NULL; |
7e12eddb | 436 | bool posix_open_ok = false; |
fb1214e4 | 437 | struct cifs_fid fid; |
233839b1 | 438 | struct cifs_pending_open open; |
1da177e4 | 439 | |
6d5786a3 | 440 | xid = get_xid(); |
1da177e4 LT |
441 | |
442 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
443 | tlink = cifs_sb_tlink(cifs_sb); |
444 | if (IS_ERR(tlink)) { | |
6d5786a3 | 445 | free_xid(xid); |
7ffec372 JL |
446 | return PTR_ERR(tlink); |
447 | } | |
448 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 449 | server = tcon->ses->server; |
1da177e4 | 450 | |
e6a00296 | 451 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 452 | if (full_path == NULL) { |
0f3bc09e | 453 | rc = -ENOMEM; |
232341ba | 454 | goto out; |
1da177e4 LT |
455 | } |
456 | ||
b6b38f70 JP |
457 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
458 | inode, file->f_flags, full_path); | |
276a74a4 | 459 | |
233839b1 | 460 | if (server->oplocks) |
276a74a4 SF |
461 | oplock = REQ_OPLOCK; |
462 | else | |
463 | oplock = 0; | |
464 | ||
64cc2c63 | 465 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
466 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
467 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 468 | /* can not refresh inode info since size could be stale */ |
2422f676 | 469 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 470 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 471 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 472 | if (rc == 0) { |
b6b38f70 | 473 | cFYI(1, "posix open succeeded"); |
7e12eddb | 474 | posix_open_ok = true; |
64cc2c63 SF |
475 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
476 | if (tcon->ses->serverNOS) | |
b6b38f70 | 477 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
478 | " unexpected error on SMB posix open" |
479 | ", disabling posix open support." | |
480 | " Check if server update available.", | |
481 | tcon->ses->serverName, | |
b6b38f70 | 482 | tcon->ses->serverNOS); |
64cc2c63 | 483 | tcon->broken_posix_open = true; |
276a74a4 SF |
484 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
485 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
486 | goto out; | |
fb1214e4 PS |
487 | /* |
488 | * Else fallthrough to retry open the old way on network i/o | |
489 | * or DFS errors. | |
490 | */ | |
276a74a4 SF |
491 | } |
492 | ||
233839b1 PS |
493 | if (server->ops->get_lease_key) |
494 | server->ops->get_lease_key(inode, &fid); | |
495 | ||
496 | cifs_add_pending_open(&fid, tlink, &open); | |
497 | ||
7e12eddb | 498 | if (!posix_open_ok) { |
b8c32dbb PS |
499 | if (server->ops->get_lease_key) |
500 | server->ops->get_lease_key(inode, &fid); | |
501 | ||
7e12eddb | 502 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 503 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
504 | if (rc) { |
505 | cifs_del_pending_open(&open); | |
7e12eddb | 506 | goto out; |
233839b1 | 507 | } |
7e12eddb | 508 | } |
47c78b7f | 509 | |
fb1214e4 PS |
510 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
511 | if (cfile == NULL) { | |
b8c32dbb PS |
512 | if (server->ops->close) |
513 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 514 | cifs_del_pending_open(&open); |
1da177e4 LT |
515 | rc = -ENOMEM; |
516 | goto out; | |
517 | } | |
1da177e4 | 518 | |
9451a9a5 SJ |
519 | cifs_fscache_set_inode_cookie(inode, file); |
520 | ||
7e12eddb | 521 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
522 | /* |
523 | * Time to set mode which we can not set earlier due to | |
524 | * problems creating new read-only files. | |
525 | */ | |
7e12eddb PS |
526 | struct cifs_unix_set_info_args args = { |
527 | .mode = inode->i_mode, | |
49418b2c EB |
528 | .uid = INVALID_UID, /* no change */ |
529 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
530 | .ctime = NO_CHANGE_64, |
531 | .atime = NO_CHANGE_64, | |
532 | .mtime = NO_CHANGE_64, | |
533 | .device = 0, | |
534 | }; | |
fb1214e4 PS |
535 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
536 | cfile->pid); | |
1da177e4 LT |
537 | } |
538 | ||
539 | out: | |
1da177e4 | 540 | kfree(full_path); |
6d5786a3 | 541 | free_xid(xid); |
7ffec372 | 542 | cifs_put_tlink(tlink); |
1da177e4 LT |
543 | return rc; |
544 | } | |
545 | ||
f152fd5f PS |
546 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
547 | ||
2ae78ba8 PS |
548 | /* |
549 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 550 | * to server was lost. |
2ae78ba8 | 551 | */ |
f152fd5f PS |
552 | static int |
553 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 554 | { |
f152fd5f PS |
555 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
556 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
557 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
558 | int rc = 0; |
559 | ||
f152fd5f PS |
560 | /* we are going to update can_cache_brlcks here - need a write access */ |
561 | down_write(&cinode->lock_sem); | |
562 | if (cinode->can_cache_brlcks) { | |
563 | /* can cache locks - no need to push them */ | |
564 | up_write(&cinode->lock_sem); | |
565 | return rc; | |
566 | } | |
567 | ||
568 | if (cap_unix(tcon->ses) && | |
569 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
570 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
571 | rc = cifs_push_posix_locks(cfile); | |
572 | else | |
573 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 574 | |
f152fd5f | 575 | up_write(&cinode->lock_sem); |
1da177e4 LT |
576 | return rc; |
577 | } | |
578 | ||
2ae78ba8 PS |
579 | static int |
580 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
581 | { |
582 | int rc = -EACCES; | |
6d5786a3 | 583 | unsigned int xid; |
590a3fe0 | 584 | __u32 oplock; |
1da177e4 | 585 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 586 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
587 | struct TCP_Server_Info *server; |
588 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 589 | struct inode *inode; |
1da177e4 | 590 | char *full_path = NULL; |
2ae78ba8 | 591 | int desired_access; |
1da177e4 | 592 | int disposition = FILE_OPEN; |
3d3ea8e6 | 593 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 594 | struct cifs_fid fid; |
1da177e4 | 595 | |
6d5786a3 | 596 | xid = get_xid(); |
2ae78ba8 PS |
597 | mutex_lock(&cfile->fh_mutex); |
598 | if (!cfile->invalidHandle) { | |
599 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 600 | rc = 0; |
6d5786a3 | 601 | free_xid(xid); |
0f3bc09e | 602 | return rc; |
1da177e4 LT |
603 | } |
604 | ||
2ae78ba8 | 605 | inode = cfile->dentry->d_inode; |
1da177e4 | 606 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
607 | tcon = tlink_tcon(cfile->tlink); |
608 | server = tcon->ses->server; | |
609 | ||
610 | /* | |
611 | * Can not grab rename sem here because various ops, including those | |
612 | * that already have the rename sem can end up causing writepage to get | |
613 | * called and if the server was down that means we end up here, and we | |
614 | * can never tell if the caller already has the rename_sem. | |
615 | */ | |
616 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 617 | if (full_path == NULL) { |
3a9f462f | 618 | rc = -ENOMEM; |
2ae78ba8 | 619 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 620 | free_xid(xid); |
3a9f462f | 621 | return rc; |
1da177e4 LT |
622 | } |
623 | ||
2ae78ba8 PS |
624 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
625 | full_path); | |
1da177e4 | 626 | |
10b9b98e | 627 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
628 | oplock = REQ_OPLOCK; |
629 | else | |
4b18f2a9 | 630 | oplock = 0; |
1da177e4 | 631 | |
29e20f9c | 632 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 633 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 634 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
635 | /* |
636 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
637 | * original open. Must mask them off for a reopen. | |
638 | */ | |
2ae78ba8 | 639 | unsigned int oflags = cfile->f_flags & |
15886177 | 640 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 641 | |
2422f676 | 642 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
643 | cifs_sb->mnt_file_mode /* ignored */, |
644 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 645 | if (rc == 0) { |
b6b38f70 | 646 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
647 | goto reopen_success; |
648 | } | |
2ae78ba8 PS |
649 | /* |
650 | * fallthrough to retry open the old way on errors, especially | |
651 | * in the reconnect path it is important to retry hard | |
652 | */ | |
7fc8f4e9 SF |
653 | } |
654 | ||
2ae78ba8 | 655 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 656 | |
3d3ea8e6 SP |
657 | if (backup_cred(cifs_sb)) |
658 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
659 | ||
b8c32dbb PS |
660 | if (server->ops->get_lease_key) |
661 | server->ops->get_lease_key(inode, &fid); | |
662 | ||
2ae78ba8 PS |
663 | /* |
664 | * Can not refresh inode by passing in file_info buf to be returned by | |
665 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
666 | * file might have write behind data that needs to be flushed and server | |
667 | * version of file size can be stale. If we knew for sure that inode was | |
668 | * not dirty locally we could do this. | |
669 | */ | |
670 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
671 | desired_access, create_options, &fid, &oplock, | |
672 | NULL, cifs_sb); | |
1da177e4 | 673 | if (rc) { |
2ae78ba8 PS |
674 | mutex_unlock(&cfile->fh_mutex); |
675 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 676 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
677 | goto reopen_error_exit; |
678 | } | |
679 | ||
7fc8f4e9 | 680 | reopen_success: |
2ae78ba8 PS |
681 | cfile->invalidHandle = false; |
682 | mutex_unlock(&cfile->fh_mutex); | |
683 | cinode = CIFS_I(inode); | |
15886177 JL |
684 | |
685 | if (can_flush) { | |
686 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 687 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 688 | |
15886177 | 689 | if (tcon->unix_ext) |
2ae78ba8 PS |
690 | rc = cifs_get_inode_info_unix(&inode, full_path, |
691 | inode->i_sb, xid); | |
15886177 | 692 | else |
2ae78ba8 PS |
693 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
694 | inode->i_sb, xid, NULL); | |
695 | } | |
696 | /* | |
697 | * Else we are writing out data to server already and could deadlock if | |
698 | * we tried to flush data, and since we do not know if we have data that | |
699 | * would invalidate the current end of file on the server we can not go | |
700 | * to the server to get the new inode info. | |
701 | */ | |
702 | ||
703 | server->ops->set_fid(cfile, &fid, oplock); | |
704 | cifs_relock_file(cfile); | |
15886177 JL |
705 | |
706 | reopen_error_exit: | |
1da177e4 | 707 | kfree(full_path); |
6d5786a3 | 708 | free_xid(xid); |
1da177e4 LT |
709 | return rc; |
710 | } | |
711 | ||
712 | int cifs_close(struct inode *inode, struct file *file) | |
713 | { | |
77970693 JL |
714 | if (file->private_data != NULL) { |
715 | cifsFileInfo_put(file->private_data); | |
716 | file->private_data = NULL; | |
717 | } | |
7ee1af76 | 718 | |
cdff08e7 SF |
719 | /* return code from the ->release op is always ignored */ |
720 | return 0; | |
1da177e4 LT |
721 | } |
722 | ||
723 | int cifs_closedir(struct inode *inode, struct file *file) | |
724 | { | |
725 | int rc = 0; | |
6d5786a3 | 726 | unsigned int xid; |
4b4de76e | 727 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
728 | struct cifs_tcon *tcon; |
729 | struct TCP_Server_Info *server; | |
730 | char *buf; | |
1da177e4 | 731 | |
b6b38f70 | 732 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 733 | |
92fc65a7 PS |
734 | if (cfile == NULL) |
735 | return rc; | |
736 | ||
6d5786a3 | 737 | xid = get_xid(); |
92fc65a7 PS |
738 | tcon = tlink_tcon(cfile->tlink); |
739 | server = tcon->ses->server; | |
1da177e4 | 740 | |
92fc65a7 PS |
741 | cFYI(1, "Freeing private data in close dir"); |
742 | spin_lock(&cifs_file_list_lock); | |
743 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
744 | cfile->invalidHandle = true; | |
745 | spin_unlock(&cifs_file_list_lock); | |
746 | if (server->ops->close_dir) | |
747 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
748 | else | |
749 | rc = -ENOSYS; | |
750 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
751 | /* not much we can do if it fails anyway, ignore rc */ | |
752 | rc = 0; | |
753 | } else | |
754 | spin_unlock(&cifs_file_list_lock); | |
755 | ||
756 | buf = cfile->srch_inf.ntwrk_buf_start; | |
757 | if (buf) { | |
758 | cFYI(1, "closedir free smb buf in srch struct"); | |
759 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
760 | if (cfile->srch_inf.smallBuf) | |
761 | cifs_small_buf_release(buf); | |
762 | else | |
763 | cifs_buf_release(buf); | |
1da177e4 | 764 | } |
92fc65a7 PS |
765 | |
766 | cifs_put_tlink(cfile->tlink); | |
767 | kfree(file->private_data); | |
768 | file->private_data = NULL; | |
1da177e4 | 769 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 770 | free_xid(xid); |
1da177e4 LT |
771 | return rc; |
772 | } | |
773 | ||
85160e03 | 774 | static struct cifsLockInfo * |
fbd35aca | 775 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 776 | { |
a88b4707 | 777 | struct cifsLockInfo *lock = |
fb8c4b14 | 778 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
779 | if (!lock) |
780 | return lock; | |
781 | lock->offset = offset; | |
782 | lock->length = length; | |
783 | lock->type = type; | |
a88b4707 PS |
784 | lock->pid = current->tgid; |
785 | INIT_LIST_HEAD(&lock->blist); | |
786 | init_waitqueue_head(&lock->block_q); | |
787 | return lock; | |
85160e03 PS |
788 | } |
789 | ||
f7ba7fe6 | 790 | void |
85160e03 PS |
791 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
792 | { | |
793 | struct cifsLockInfo *li, *tmp; | |
794 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
795 | list_del_init(&li->blist); | |
796 | wake_up(&li->block_q); | |
797 | } | |
798 | } | |
799 | ||
081c0414 PS |
800 | #define CIFS_LOCK_OP 0 |
801 | #define CIFS_READ_OP 1 | |
802 | #define CIFS_WRITE_OP 2 | |
803 | ||
804 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 805 | static bool |
f45d3416 PS |
806 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
807 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 808 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 809 | { |
fbd35aca | 810 | struct cifsLockInfo *li; |
f45d3416 | 811 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 812 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 813 | |
f45d3416 | 814 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
815 | if (offset + length <= li->offset || |
816 | offset >= li->offset + li->length) | |
817 | continue; | |
081c0414 PS |
818 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
819 | server->ops->compare_fids(cfile, cur_cfile)) { | |
820 | /* shared lock prevents write op through the same fid */ | |
821 | if (!(li->type & server->vals->shared_lock_type) || | |
822 | rw_check != CIFS_WRITE_OP) | |
823 | continue; | |
824 | } | |
f45d3416 PS |
825 | if ((type & server->vals->shared_lock_type) && |
826 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
827 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 828 | continue; |
579f9053 PS |
829 | if (conf_lock) |
830 | *conf_lock = li; | |
f45d3416 | 831 | return true; |
85160e03 PS |
832 | } |
833 | return false; | |
834 | } | |
835 | ||
579f9053 | 836 | bool |
55157dfb | 837 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 838 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 839 | int rw_check) |
161ebf9f | 840 | { |
fbd35aca | 841 | bool rc = false; |
f45d3416 | 842 | struct cifs_fid_locks *cur; |
55157dfb | 843 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 844 | |
f45d3416 PS |
845 | list_for_each_entry(cur, &cinode->llist, llist) { |
846 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 847 | cfile, conf_lock, rw_check); |
fbd35aca PS |
848 | if (rc) |
849 | break; | |
850 | } | |
fbd35aca PS |
851 | |
852 | return rc; | |
161ebf9f PS |
853 | } |
854 | ||
9a5101c8 PS |
855 | /* |
856 | * Check if there is another lock that prevents us to set the lock (mandatory | |
857 | * style). If such a lock exists, update the flock structure with its | |
858 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
859 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
860 | * the server or 1 otherwise. | |
861 | */ | |
85160e03 | 862 | static int |
fbd35aca PS |
863 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
864 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
865 | { |
866 | int rc = 0; | |
867 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 868 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 869 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
870 | bool exist; |
871 | ||
1b4b55a1 | 872 | down_read(&cinode->lock_sem); |
85160e03 | 873 | |
55157dfb | 874 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 875 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
876 | if (exist) { |
877 | flock->fl_start = conf_lock->offset; | |
878 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
879 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 880 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
881 | flock->fl_type = F_RDLCK; |
882 | else | |
883 | flock->fl_type = F_WRLCK; | |
884 | } else if (!cinode->can_cache_brlcks) | |
885 | rc = 1; | |
886 | else | |
887 | flock->fl_type = F_UNLCK; | |
888 | ||
1b4b55a1 | 889 | up_read(&cinode->lock_sem); |
85160e03 PS |
890 | return rc; |
891 | } | |
892 | ||
161ebf9f | 893 | static void |
fbd35aca | 894 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 895 | { |
fbd35aca | 896 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 897 | down_write(&cinode->lock_sem); |
f45d3416 | 898 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 899 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
900 | } |
901 | ||
9a5101c8 PS |
902 | /* |
903 | * Set the byte-range lock (mandatory style). Returns: | |
904 | * 1) 0, if we set the lock and don't need to request to the server; | |
905 | * 2) 1, if no locks prevent us but we need to request to the server; | |
906 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
907 | */ | |
85160e03 | 908 | static int |
fbd35aca | 909 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 910 | bool wait) |
85160e03 | 911 | { |
161ebf9f | 912 | struct cifsLockInfo *conf_lock; |
fbd35aca | 913 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
914 | bool exist; |
915 | int rc = 0; | |
916 | ||
85160e03 PS |
917 | try_again: |
918 | exist = false; | |
1b4b55a1 | 919 | down_write(&cinode->lock_sem); |
85160e03 | 920 | |
55157dfb | 921 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 922 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 923 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 924 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 925 | up_write(&cinode->lock_sem); |
85160e03 PS |
926 | return rc; |
927 | } | |
928 | ||
929 | if (!exist) | |
930 | rc = 1; | |
931 | else if (!wait) | |
932 | rc = -EACCES; | |
933 | else { | |
934 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 935 | up_write(&cinode->lock_sem); |
85160e03 PS |
936 | rc = wait_event_interruptible(lock->block_q, |
937 | (lock->blist.prev == &lock->blist) && | |
938 | (lock->blist.next == &lock->blist)); | |
939 | if (!rc) | |
940 | goto try_again; | |
1b4b55a1 | 941 | down_write(&cinode->lock_sem); |
a88b4707 | 942 | list_del_init(&lock->blist); |
85160e03 PS |
943 | } |
944 | ||
1b4b55a1 | 945 | up_write(&cinode->lock_sem); |
85160e03 PS |
946 | return rc; |
947 | } | |
948 | ||
9a5101c8 PS |
949 | /* |
950 | * Check if there is another lock that prevents us to set the lock (posix | |
951 | * style). If such a lock exists, update the flock structure with its | |
952 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
953 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
954 | * the server or 1 otherwise. | |
955 | */ | |
85160e03 | 956 | static int |
4f6bcec9 PS |
957 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
958 | { | |
959 | int rc = 0; | |
496ad9aa | 960 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
961 | unsigned char saved_type = flock->fl_type; |
962 | ||
50792760 PS |
963 | if ((flock->fl_flags & FL_POSIX) == 0) |
964 | return 1; | |
965 | ||
1b4b55a1 | 966 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
967 | posix_test_lock(file, flock); |
968 | ||
969 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
970 | flock->fl_type = saved_type; | |
971 | rc = 1; | |
972 | } | |
973 | ||
1b4b55a1 | 974 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
975 | return rc; |
976 | } | |
977 | ||
9a5101c8 PS |
978 | /* |
979 | * Set the byte-range lock (posix style). Returns: | |
980 | * 1) 0, if we set the lock and don't need to request to the server; | |
981 | * 2) 1, if we need to request to the server; | |
982 | * 3) <0, if the error occurs while setting the lock. | |
983 | */ | |
4f6bcec9 PS |
984 | static int |
985 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
986 | { | |
496ad9aa | 987 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
988 | int rc = 1; |
989 | ||
990 | if ((flock->fl_flags & FL_POSIX) == 0) | |
991 | return rc; | |
4f6bcec9 | 992 | |
66189be7 | 993 | try_again: |
1b4b55a1 | 994 | down_write(&cinode->lock_sem); |
4f6bcec9 | 995 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 996 | up_write(&cinode->lock_sem); |
50792760 | 997 | return rc; |
4f6bcec9 | 998 | } |
66189be7 PS |
999 | |
1000 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1001 | up_write(&cinode->lock_sem); |
66189be7 PS |
1002 | if (rc == FILE_LOCK_DEFERRED) { |
1003 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1004 | if (!rc) | |
1005 | goto try_again; | |
1006 | locks_delete_block(flock); | |
1007 | } | |
9ebb389d | 1008 | return rc; |
4f6bcec9 PS |
1009 | } |
1010 | ||
d39a4f71 | 1011 | int |
4f6bcec9 | 1012 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1013 | { |
6d5786a3 PS |
1014 | unsigned int xid; |
1015 | int rc = 0, stored_rc; | |
85160e03 PS |
1016 | struct cifsLockInfo *li, *tmp; |
1017 | struct cifs_tcon *tcon; | |
0013fb4c | 1018 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1019 | LOCKING_ANDX_RANGE *buf, *cur; |
1020 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1021 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1022 | int i; | |
85160e03 | 1023 | |
6d5786a3 | 1024 | xid = get_xid(); |
85160e03 PS |
1025 | tcon = tlink_tcon(cfile->tlink); |
1026 | ||
0013fb4c PS |
1027 | /* |
1028 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1029 | * and check it for zero before using. | |
1030 | */ | |
1031 | max_buf = tcon->ses->server->maxBuf; | |
1032 | if (!max_buf) { | |
6d5786a3 | 1033 | free_xid(xid); |
0013fb4c PS |
1034 | return -EINVAL; |
1035 | } | |
1036 | ||
1037 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1038 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1039 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1040 | if (!buf) { | |
6d5786a3 | 1041 | free_xid(xid); |
e2f2886a | 1042 | return -ENOMEM; |
32b9aaf1 PS |
1043 | } |
1044 | ||
1045 | for (i = 0; i < 2; i++) { | |
1046 | cur = buf; | |
1047 | num = 0; | |
f45d3416 | 1048 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1049 | if (li->type != types[i]) |
1050 | continue; | |
1051 | cur->Pid = cpu_to_le16(li->pid); | |
1052 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1053 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1054 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1055 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1056 | if (++num == max_num) { | |
4b4de76e PS |
1057 | stored_rc = cifs_lockv(xid, tcon, |
1058 | cfile->fid.netfid, | |
04a6aa8a PS |
1059 | (__u8)li->type, 0, num, |
1060 | buf); | |
32b9aaf1 PS |
1061 | if (stored_rc) |
1062 | rc = stored_rc; | |
1063 | cur = buf; | |
1064 | num = 0; | |
1065 | } else | |
1066 | cur++; | |
1067 | } | |
1068 | ||
1069 | if (num) { | |
4b4de76e | 1070 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1071 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1072 | if (stored_rc) |
1073 | rc = stored_rc; | |
1074 | } | |
85160e03 PS |
1075 | } |
1076 | ||
32b9aaf1 | 1077 | kfree(buf); |
6d5786a3 | 1078 | free_xid(xid); |
85160e03 PS |
1079 | return rc; |
1080 | } | |
1081 | ||
4f6bcec9 PS |
1082 | /* copied from fs/locks.c with a name change */ |
1083 | #define cifs_for_each_lock(inode, lockp) \ | |
1084 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1085 | lockp = &(*lockp)->fl_next) | |
1086 | ||
d5751469 PS |
1087 | struct lock_to_push { |
1088 | struct list_head llist; | |
1089 | __u64 offset; | |
1090 | __u64 length; | |
1091 | __u32 pid; | |
1092 | __u16 netfid; | |
1093 | __u8 type; | |
1094 | }; | |
1095 | ||
4f6bcec9 | 1096 | static int |
b8db928b | 1097 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1098 | { |
4f6bcec9 PS |
1099 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1100 | struct file_lock *flock, **before; | |
d5751469 | 1101 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1102 | int rc = 0, xid, type; |
d5751469 PS |
1103 | struct list_head locks_to_send, *el; |
1104 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1105 | __u64 length; |
4f6bcec9 | 1106 | |
6d5786a3 | 1107 | xid = get_xid(); |
4f6bcec9 | 1108 | |
d5751469 PS |
1109 | lock_flocks(); |
1110 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1111 | if ((*before)->fl_flags & FL_POSIX) | |
1112 | count++; | |
1113 | } | |
1114 | unlock_flocks(); | |
1115 | ||
4f6bcec9 PS |
1116 | INIT_LIST_HEAD(&locks_to_send); |
1117 | ||
d5751469 | 1118 | /* |
ce85852b | 1119 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1120 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1121 | * protects locking operations of this inode. |
d5751469 PS |
1122 | */ |
1123 | for (; i < count; i++) { | |
1124 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1125 | if (!lck) { | |
1126 | rc = -ENOMEM; | |
1127 | goto err_out; | |
1128 | } | |
1129 | list_add_tail(&lck->llist, &locks_to_send); | |
1130 | } | |
1131 | ||
d5751469 | 1132 | el = locks_to_send.next; |
4f6bcec9 PS |
1133 | lock_flocks(); |
1134 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1135 | flock = *before; |
1136 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1137 | continue; | |
d5751469 | 1138 | if (el == &locks_to_send) { |
ce85852b PS |
1139 | /* |
1140 | * The list ended. We don't have enough allocated | |
1141 | * structures - something is really wrong. | |
1142 | */ | |
d5751469 PS |
1143 | cERROR(1, "Can't push all brlocks!"); |
1144 | break; | |
1145 | } | |
4f6bcec9 PS |
1146 | length = 1 + flock->fl_end - flock->fl_start; |
1147 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1148 | type = CIFS_RDLCK; | |
1149 | else | |
1150 | type = CIFS_WRLCK; | |
d5751469 | 1151 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1152 | lck->pid = flock->fl_pid; |
4b4de76e | 1153 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1154 | lck->length = length; |
1155 | lck->type = type; | |
1156 | lck->offset = flock->fl_start; | |
d5751469 | 1157 | el = el->next; |
4f6bcec9 | 1158 | } |
4f6bcec9 PS |
1159 | unlock_flocks(); |
1160 | ||
1161 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1162 | int stored_rc; |
1163 | ||
4f6bcec9 | 1164 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1165 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1166 | lck->type, 0); |
1167 | if (stored_rc) | |
1168 | rc = stored_rc; | |
1169 | list_del(&lck->llist); | |
1170 | kfree(lck); | |
1171 | } | |
1172 | ||
d5751469 | 1173 | out: |
6d5786a3 | 1174 | free_xid(xid); |
4f6bcec9 | 1175 | return rc; |
d5751469 PS |
1176 | err_out: |
1177 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1178 | list_del(&lck->llist); | |
1179 | kfree(lck); | |
1180 | } | |
1181 | goto out; | |
4f6bcec9 PS |
1182 | } |
1183 | ||
9ec3c882 | 1184 | static int |
b8db928b | 1185 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1186 | { |
b8db928b | 1187 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1188 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1189 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1190 | int rc = 0; |
1191 | ||
1192 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1193 | down_write(&cinode->lock_sem); | |
1194 | if (!cinode->can_cache_brlcks) { | |
1195 | up_write(&cinode->lock_sem); | |
1196 | return rc; | |
1197 | } | |
4f6bcec9 | 1198 | |
29e20f9c | 1199 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1200 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1201 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1202 | rc = cifs_push_posix_locks(cfile); |
1203 | else | |
1204 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1205 | |
b8db928b PS |
1206 | cinode->can_cache_brlcks = false; |
1207 | up_write(&cinode->lock_sem); | |
1208 | return rc; | |
4f6bcec9 PS |
1209 | } |
1210 | ||
03776f45 | 1211 | static void |
04a6aa8a | 1212 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1213 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1214 | { |
03776f45 | 1215 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1216 | cFYI(1, "Posix"); |
03776f45 | 1217 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1218 | cFYI(1, "Flock"); |
03776f45 | 1219 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1220 | cFYI(1, "Blocking lock"); |
03776f45 | 1221 | *wait_flag = true; |
1da177e4 | 1222 | } |
03776f45 | 1223 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1224 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1225 | "not implemented yet"); |
1226 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1227 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1228 | if (flock->fl_flags & |
3d6d854a JL |
1229 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1230 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
03776f45 | 1231 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1232 | |
106dc538 | 1233 | *type = server->vals->large_lock_type; |
03776f45 | 1234 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1235 | cFYI(1, "F_WRLCK "); |
106dc538 | 1236 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1237 | *lock = 1; |
1238 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1239 | cFYI(1, "F_UNLCK"); |
106dc538 | 1240 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1241 | *unlock = 1; |
1242 | /* Check if unlock includes more than one lock range */ | |
1243 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1244 | cFYI(1, "F_RDLCK"); |
106dc538 | 1245 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1246 | *lock = 1; |
1247 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1248 | cFYI(1, "F_EXLCK"); |
106dc538 | 1249 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1250 | *lock = 1; |
1251 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1252 | cFYI(1, "F_SHLCK"); |
106dc538 | 1253 | *type |= server->vals->shared_lock_type; |
03776f45 | 1254 | *lock = 1; |
1da177e4 | 1255 | } else |
b6b38f70 | 1256 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1257 | } |
1da177e4 | 1258 | |
03776f45 | 1259 | static int |
04a6aa8a | 1260 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1261 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1262 | { |
1263 | int rc = 0; | |
1264 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1265 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1266 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1267 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1268 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1269 | |
03776f45 PS |
1270 | if (posix_lck) { |
1271 | int posix_lock_type; | |
4f6bcec9 PS |
1272 | |
1273 | rc = cifs_posix_lock_test(file, flock); | |
1274 | if (!rc) | |
1275 | return rc; | |
1276 | ||
106dc538 | 1277 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1278 | posix_lock_type = CIFS_RDLCK; |
1279 | else | |
1280 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1281 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1282 | flock->fl_start, length, flock, |
4f6bcec9 | 1283 | posix_lock_type, wait_flag); |
03776f45 PS |
1284 | return rc; |
1285 | } | |
1da177e4 | 1286 | |
fbd35aca | 1287 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1288 | if (!rc) |
1289 | return rc; | |
1290 | ||
03776f45 | 1291 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1292 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1293 | 1, 0, false); | |
03776f45 | 1294 | if (rc == 0) { |
d39a4f71 PS |
1295 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1296 | type, 0, 1, false); | |
03776f45 PS |
1297 | flock->fl_type = F_UNLCK; |
1298 | if (rc != 0) | |
1299 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1300 | "range %d during test of lock", rc); |
a88b4707 | 1301 | return 0; |
1da177e4 | 1302 | } |
7ee1af76 | 1303 | |
106dc538 | 1304 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1305 | flock->fl_type = F_WRLCK; |
a88b4707 | 1306 | return 0; |
7ee1af76 JA |
1307 | } |
1308 | ||
d39a4f71 PS |
1309 | type &= ~server->vals->exclusive_lock_type; |
1310 | ||
1311 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1312 | type | server->vals->shared_lock_type, | |
1313 | 1, 0, false); | |
03776f45 | 1314 | if (rc == 0) { |
d39a4f71 PS |
1315 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1316 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1317 | flock->fl_type = F_RDLCK; |
1318 | if (rc != 0) | |
1319 | cERROR(1, "Error unlocking previously locked " | |
1320 | "range %d during test of lock", rc); | |
1321 | } else | |
1322 | flock->fl_type = F_WRLCK; | |
1323 | ||
a88b4707 | 1324 | return 0; |
03776f45 PS |
1325 | } |
1326 | ||
f7ba7fe6 | 1327 | void |
9ee305b7 PS |
1328 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1329 | { | |
1330 | struct list_head *li, *tmp; | |
1331 | list_for_each_safe(li, tmp, source) | |
1332 | list_move(li, dest); | |
1333 | } | |
1334 | ||
f7ba7fe6 | 1335 | void |
9ee305b7 PS |
1336 | cifs_free_llist(struct list_head *llist) |
1337 | { | |
1338 | struct cifsLockInfo *li, *tmp; | |
1339 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1340 | cifs_del_lock_waiters(li); | |
1341 | list_del(&li->llist); | |
1342 | kfree(li); | |
1343 | } | |
1344 | } | |
1345 | ||
d39a4f71 | 1346 | int |
6d5786a3 PS |
1347 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1348 | unsigned int xid) | |
9ee305b7 PS |
1349 | { |
1350 | int rc = 0, stored_rc; | |
1351 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1352 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1353 | unsigned int i; | |
0013fb4c | 1354 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1355 | LOCKING_ANDX_RANGE *buf, *cur; |
1356 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1357 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1358 | struct cifsLockInfo *li, *tmp; | |
1359 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1360 | struct list_head tmp_llist; | |
1361 | ||
1362 | INIT_LIST_HEAD(&tmp_llist); | |
1363 | ||
0013fb4c PS |
1364 | /* |
1365 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1366 | * and check it for zero before using. | |
1367 | */ | |
1368 | max_buf = tcon->ses->server->maxBuf; | |
1369 | if (!max_buf) | |
1370 | return -EINVAL; | |
1371 | ||
1372 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1373 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1374 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1375 | if (!buf) | |
1376 | return -ENOMEM; | |
1377 | ||
1b4b55a1 | 1378 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1379 | for (i = 0; i < 2; i++) { |
1380 | cur = buf; | |
1381 | num = 0; | |
f45d3416 | 1382 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1383 | if (flock->fl_start > li->offset || |
1384 | (flock->fl_start + length) < | |
1385 | (li->offset + li->length)) | |
1386 | continue; | |
1387 | if (current->tgid != li->pid) | |
1388 | continue; | |
9ee305b7 PS |
1389 | if (types[i] != li->type) |
1390 | continue; | |
ea319d57 | 1391 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1392 | /* |
1393 | * We can cache brlock requests - simply remove | |
fbd35aca | 1394 | * a lock from the file's list. |
9ee305b7 PS |
1395 | */ |
1396 | list_del(&li->llist); | |
1397 | cifs_del_lock_waiters(li); | |
1398 | kfree(li); | |
ea319d57 | 1399 | continue; |
9ee305b7 | 1400 | } |
ea319d57 PS |
1401 | cur->Pid = cpu_to_le16(li->pid); |
1402 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1403 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1404 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1405 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1406 | /* | |
1407 | * We need to save a lock here to let us add it again to | |
1408 | * the file's list if the unlock range request fails on | |
1409 | * the server. | |
1410 | */ | |
1411 | list_move(&li->llist, &tmp_llist); | |
1412 | if (++num == max_num) { | |
4b4de76e PS |
1413 | stored_rc = cifs_lockv(xid, tcon, |
1414 | cfile->fid.netfid, | |
ea319d57 PS |
1415 | li->type, num, 0, buf); |
1416 | if (stored_rc) { | |
1417 | /* | |
1418 | * We failed on the unlock range | |
1419 | * request - add all locks from the tmp | |
1420 | * list to the head of the file's list. | |
1421 | */ | |
1422 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1423 | &cfile->llist->locks); |
ea319d57 PS |
1424 | rc = stored_rc; |
1425 | } else | |
1426 | /* | |
1427 | * The unlock range request succeed - | |
1428 | * free the tmp list. | |
1429 | */ | |
1430 | cifs_free_llist(&tmp_llist); | |
1431 | cur = buf; | |
1432 | num = 0; | |
1433 | } else | |
1434 | cur++; | |
9ee305b7 PS |
1435 | } |
1436 | if (num) { | |
4b4de76e | 1437 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1438 | types[i], num, 0, buf); |
1439 | if (stored_rc) { | |
f45d3416 PS |
1440 | cifs_move_llist(&tmp_llist, |
1441 | &cfile->llist->locks); | |
9ee305b7 PS |
1442 | rc = stored_rc; |
1443 | } else | |
1444 | cifs_free_llist(&tmp_llist); | |
1445 | } | |
1446 | } | |
1447 | ||
1b4b55a1 | 1448 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1449 | kfree(buf); |
1450 | return rc; | |
1451 | } | |
1452 | ||
03776f45 | 1453 | static int |
f45d3416 | 1454 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1455 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1456 | unsigned int xid) | |
03776f45 PS |
1457 | { |
1458 | int rc = 0; | |
1459 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1460 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1461 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1462 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1463 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1464 | |
1465 | if (posix_lck) { | |
08547b03 | 1466 | int posix_lock_type; |
4f6bcec9 PS |
1467 | |
1468 | rc = cifs_posix_lock_set(file, flock); | |
1469 | if (!rc || rc < 0) | |
1470 | return rc; | |
1471 | ||
106dc538 | 1472 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1473 | posix_lock_type = CIFS_RDLCK; |
1474 | else | |
1475 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1476 | |
03776f45 | 1477 | if (unlock == 1) |
beb84dc8 | 1478 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1479 | |
f45d3416 PS |
1480 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1481 | current->tgid, flock->fl_start, length, | |
1482 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1483 | goto out; |
1484 | } | |
7ee1af76 | 1485 | |
03776f45 | 1486 | if (lock) { |
161ebf9f PS |
1487 | struct cifsLockInfo *lock; |
1488 | ||
fbd35aca | 1489 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1490 | if (!lock) |
1491 | return -ENOMEM; | |
1492 | ||
fbd35aca | 1493 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1494 | if (rc < 0) { |
161ebf9f | 1495 | kfree(lock); |
21cb2d90 PS |
1496 | return rc; |
1497 | } | |
1498 | if (!rc) | |
85160e03 PS |
1499 | goto out; |
1500 | ||
63b7d3a4 PS |
1501 | /* |
1502 | * Windows 7 server can delay breaking lease from read to None | |
1503 | * if we set a byte-range lock on a file - break it explicitly | |
1504 | * before sending the lock to the server to be sure the next | |
1505 | * read won't conflict with non-overlapted locks due to | |
1506 | * pagereading. | |
1507 | */ | |
1508 | if (!CIFS_I(inode)->clientCanCacheAll && | |
1509 | CIFS_I(inode)->clientCanCacheRead) { | |
1510 | cifs_invalidate_mapping(inode); | |
1511 | cFYI(1, "Set no oplock for inode=%p due to mand locks", | |
1512 | inode); | |
1513 | CIFS_I(inode)->clientCanCacheRead = false; | |
1514 | } | |
1515 | ||
d39a4f71 PS |
1516 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1517 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1518 | if (rc) { |
1519 | kfree(lock); | |
21cb2d90 | 1520 | return rc; |
03776f45 | 1521 | } |
161ebf9f | 1522 | |
fbd35aca | 1523 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1524 | } else if (unlock) |
d39a4f71 | 1525 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1526 | |
03776f45 PS |
1527 | out: |
1528 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1529 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1530 | return rc; |
1531 | } | |
1532 | ||
1533 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1534 | { | |
1535 | int rc, xid; | |
1536 | int lock = 0, unlock = 0; | |
1537 | bool wait_flag = false; | |
1538 | bool posix_lck = false; | |
1539 | struct cifs_sb_info *cifs_sb; | |
1540 | struct cifs_tcon *tcon; | |
1541 | struct cifsInodeInfo *cinode; | |
1542 | struct cifsFileInfo *cfile; | |
1543 | __u16 netfid; | |
04a6aa8a | 1544 | __u32 type; |
03776f45 PS |
1545 | |
1546 | rc = -EACCES; | |
6d5786a3 | 1547 | xid = get_xid(); |
03776f45 PS |
1548 | |
1549 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1550 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1551 | flock->fl_start, flock->fl_end); | |
1552 | ||
03776f45 PS |
1553 | cfile = (struct cifsFileInfo *)file->private_data; |
1554 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1555 | |
1556 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1557 | tcon->ses->server); | |
1558 | ||
1559 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1560 | netfid = cfile->fid.netfid; |
496ad9aa | 1561 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1562 | |
29e20f9c | 1563 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1564 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1565 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1566 | posix_lck = true; | |
1567 | /* | |
1568 | * BB add code here to normalize offset and length to account for | |
1569 | * negative length which we can not accept over the wire. | |
1570 | */ | |
1571 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1572 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1573 | free_xid(xid); |
03776f45 PS |
1574 | return rc; |
1575 | } | |
1576 | ||
1577 | if (!lock && !unlock) { | |
1578 | /* | |
1579 | * if no lock or unlock then nothing to do since we do not | |
1580 | * know what it is | |
1581 | */ | |
6d5786a3 | 1582 | free_xid(xid); |
03776f45 | 1583 | return -EOPNOTSUPP; |
7ee1af76 JA |
1584 | } |
1585 | ||
03776f45 PS |
1586 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1587 | xid); | |
6d5786a3 | 1588 | free_xid(xid); |
1da177e4 LT |
1589 | return rc; |
1590 | } | |
1591 | ||
597b027f JL |
1592 | /* |
1593 | * update the file size (if needed) after a write. Should be called with | |
1594 | * the inode->i_lock held | |
1595 | */ | |
72432ffc | 1596 | void |
fbec9ab9 JL |
1597 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1598 | unsigned int bytes_written) | |
1599 | { | |
1600 | loff_t end_of_write = offset + bytes_written; | |
1601 | ||
1602 | if (end_of_write > cifsi->server_eof) | |
1603 | cifsi->server_eof = end_of_write; | |
1604 | } | |
1605 | ||
ba9ad725 PS |
1606 | static ssize_t |
1607 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1608 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1609 | { |
1610 | int rc = 0; | |
1611 | unsigned int bytes_written = 0; | |
1612 | unsigned int total_written; | |
1613 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1614 | struct cifs_tcon *tcon; |
1615 | struct TCP_Server_Info *server; | |
6d5786a3 | 1616 | unsigned int xid; |
7da4b49a JL |
1617 | struct dentry *dentry = open_file->dentry; |
1618 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1619 | struct cifs_io_parms io_parms; |
1da177e4 | 1620 | |
7da4b49a | 1621 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1622 | |
b6b38f70 | 1623 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1624 | *offset, dentry->d_name.name); |
1da177e4 | 1625 | |
ba9ad725 PS |
1626 | tcon = tlink_tcon(open_file->tlink); |
1627 | server = tcon->ses->server; | |
1628 | ||
1629 | if (!server->ops->sync_write) | |
1630 | return -ENOSYS; | |
50c2f753 | 1631 | |
6d5786a3 | 1632 | xid = get_xid(); |
1da177e4 | 1633 | |
1da177e4 LT |
1634 | for (total_written = 0; write_size > total_written; |
1635 | total_written += bytes_written) { | |
1636 | rc = -EAGAIN; | |
1637 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1638 | struct kvec iov[2]; |
1639 | unsigned int len; | |
1640 | ||
1da177e4 | 1641 | if (open_file->invalidHandle) { |
1da177e4 LT |
1642 | /* we could deadlock if we called |
1643 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1644 | reopen_file not to flush data to |
1da177e4 | 1645 | server now */ |
15886177 | 1646 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1647 | if (rc != 0) |
1648 | break; | |
1649 | } | |
ca83ce3d JL |
1650 | |
1651 | len = min((size_t)cifs_sb->wsize, | |
1652 | write_size - total_written); | |
1653 | /* iov[0] is reserved for smb header */ | |
1654 | iov[1].iov_base = (char *)write_data + total_written; | |
1655 | iov[1].iov_len = len; | |
fa2989f4 | 1656 | io_parms.pid = pid; |
ba9ad725 PS |
1657 | io_parms.tcon = tcon; |
1658 | io_parms.offset = *offset; | |
fa2989f4 | 1659 | io_parms.length = len; |
ba9ad725 PS |
1660 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1661 | &bytes_written, iov, 1); | |
1da177e4 LT |
1662 | } |
1663 | if (rc || (bytes_written == 0)) { | |
1664 | if (total_written) | |
1665 | break; | |
1666 | else { | |
6d5786a3 | 1667 | free_xid(xid); |
1da177e4 LT |
1668 | return rc; |
1669 | } | |
fbec9ab9 | 1670 | } else { |
597b027f | 1671 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1672 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1673 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1674 | *offset += bytes_written; |
fbec9ab9 | 1675 | } |
1da177e4 LT |
1676 | } |
1677 | ||
ba9ad725 | 1678 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1679 | |
7da4b49a JL |
1680 | if (total_written > 0) { |
1681 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1682 | if (*offset > dentry->d_inode->i_size) |
1683 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1684 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1685 | } |
7da4b49a | 1686 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1687 | free_xid(xid); |
1da177e4 LT |
1688 | return total_written; |
1689 | } | |
1690 | ||
6508d904 JL |
1691 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1692 | bool fsuid_only) | |
630f3f0c SF |
1693 | { |
1694 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1695 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1696 | ||
1697 | /* only filter by fsuid on multiuser mounts */ | |
1698 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1699 | fsuid_only = false; | |
630f3f0c | 1700 | |
4477288a | 1701 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1702 | /* we could simply get the first_list_entry since write-only entries |
1703 | are always at the end of the list but since the first entry might | |
1704 | have a close pending, we go through the whole list */ | |
1705 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1706 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1707 | continue; |
2e396b83 | 1708 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1709 | if (!open_file->invalidHandle) { |
1710 | /* found a good file */ | |
1711 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1712 | cifsFileInfo_get_locked(open_file); |
4477288a | 1713 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1714 | return open_file; |
1715 | } /* else might as well continue, and look for | |
1716 | another, or simply have the caller reopen it | |
1717 | again rather than trying to fix this handle */ | |
1718 | } else /* write only file */ | |
1719 | break; /* write only files are last so must be done */ | |
1720 | } | |
4477288a | 1721 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1722 | return NULL; |
1723 | } | |
630f3f0c | 1724 | |
6508d904 JL |
1725 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1726 | bool fsuid_only) | |
6148a742 | 1727 | { |
2c0c2a08 | 1728 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1729 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1730 | bool any_available = false; |
dd99cd80 | 1731 | int rc; |
2c0c2a08 | 1732 | unsigned int refind = 0; |
6148a742 | 1733 | |
60808233 SF |
1734 | /* Having a null inode here (because mapping->host was set to zero by |
1735 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1736 | it being zero) during stress testcases so we need to check for it */ | |
1737 | ||
fb8c4b14 | 1738 | if (cifs_inode == NULL) { |
b6b38f70 | 1739 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1740 | dump_stack(); |
1741 | return NULL; | |
1742 | } | |
1743 | ||
d3892294 JL |
1744 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1745 | ||
6508d904 JL |
1746 | /* only filter by fsuid on multiuser mounts */ |
1747 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1748 | fsuid_only = false; | |
1749 | ||
4477288a | 1750 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1751 | refind_writable: |
2c0c2a08 SP |
1752 | if (refind > MAX_REOPEN_ATT) { |
1753 | spin_unlock(&cifs_file_list_lock); | |
1754 | return NULL; | |
1755 | } | |
6148a742 | 1756 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1757 | if (!any_available && open_file->pid != current->tgid) |
1758 | continue; | |
fef59fd7 | 1759 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1760 | continue; |
2e396b83 | 1761 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1762 | if (!open_file->invalidHandle) { |
1763 | /* found a good writable file */ | |
764a1b1a | 1764 | cifsFileInfo_get_locked(open_file); |
4477288a | 1765 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1766 | return open_file; |
2c0c2a08 SP |
1767 | } else { |
1768 | if (!inv_file) | |
1769 | inv_file = open_file; | |
9b22b0b7 | 1770 | } |
6148a742 SF |
1771 | } |
1772 | } | |
2846d386 JL |
1773 | /* couldn't find useable FH with same pid, try any available */ |
1774 | if (!any_available) { | |
1775 | any_available = true; | |
1776 | goto refind_writable; | |
1777 | } | |
2c0c2a08 SP |
1778 | |
1779 | if (inv_file) { | |
1780 | any_available = false; | |
764a1b1a | 1781 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1782 | } |
1783 | ||
4477288a | 1784 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1785 | |
1786 | if (inv_file) { | |
1787 | rc = cifs_reopen_file(inv_file, false); | |
1788 | if (!rc) | |
1789 | return inv_file; | |
1790 | else { | |
1791 | spin_lock(&cifs_file_list_lock); | |
1792 | list_move_tail(&inv_file->flist, | |
1793 | &cifs_inode->openFileList); | |
1794 | spin_unlock(&cifs_file_list_lock); | |
1795 | cifsFileInfo_put(inv_file); | |
1796 | spin_lock(&cifs_file_list_lock); | |
1797 | ++refind; | |
1798 | goto refind_writable; | |
1799 | } | |
1800 | } | |
1801 | ||
6148a742 SF |
1802 | return NULL; |
1803 | } | |
1804 | ||
1da177e4 LT |
1805 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1806 | { | |
1807 | struct address_space *mapping = page->mapping; | |
1808 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1809 | char *write_data; | |
1810 | int rc = -EFAULT; | |
1811 | int bytes_written = 0; | |
1da177e4 | 1812 | struct inode *inode; |
6148a742 | 1813 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1814 | |
1815 | if (!mapping || !mapping->host) | |
1816 | return -EFAULT; | |
1817 | ||
1818 | inode = page->mapping->host; | |
1da177e4 LT |
1819 | |
1820 | offset += (loff_t)from; | |
1821 | write_data = kmap(page); | |
1822 | write_data += from; | |
1823 | ||
1824 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1825 | kunmap(page); | |
1826 | return -EIO; | |
1827 | } | |
1828 | ||
1829 | /* racing with truncate? */ | |
1830 | if (offset > mapping->host->i_size) { | |
1831 | kunmap(page); | |
1832 | return 0; /* don't care */ | |
1833 | } | |
1834 | ||
1835 | /* check to make sure that we are not extending the file */ | |
1836 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1837 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1838 | |
6508d904 | 1839 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1840 | if (open_file) { |
fa2989f4 PS |
1841 | bytes_written = cifs_write(open_file, open_file->pid, |
1842 | write_data, to - from, &offset); | |
6ab409b5 | 1843 | cifsFileInfo_put(open_file); |
1da177e4 | 1844 | /* Does mm or vfs already set times? */ |
6148a742 | 1845 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1846 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1847 | rc = 0; |
bb5a9a04 SF |
1848 | else if (bytes_written < 0) |
1849 | rc = bytes_written; | |
6148a742 | 1850 | } else { |
b6b38f70 | 1851 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1852 | rc = -EIO; |
1853 | } | |
1854 | ||
1855 | kunmap(page); | |
1856 | return rc; | |
1857 | } | |
1858 | ||
1da177e4 | 1859 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1860 | struct writeback_control *wbc) |
1da177e4 | 1861 | { |
c3d17b63 JL |
1862 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1863 | bool done = false, scanned = false, range_whole = false; | |
1864 | pgoff_t end, index; | |
1865 | struct cifs_writedata *wdata; | |
c9de5c80 | 1866 | struct TCP_Server_Info *server; |
37c0eb46 | 1867 | struct page *page; |
37c0eb46 | 1868 | int rc = 0; |
50c2f753 | 1869 | |
37c0eb46 | 1870 | /* |
c3d17b63 | 1871 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1872 | * one page at a time via cifs_writepage |
1873 | */ | |
1874 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1875 | return generic_writepages(mapping, wbc); | |
1876 | ||
111ebb6e | 1877 | if (wbc->range_cyclic) { |
37c0eb46 | 1878 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1879 | end = -1; |
1880 | } else { | |
1881 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1882 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1883 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1884 | range_whole = true; |
1885 | scanned = true; | |
37c0eb46 SF |
1886 | } |
1887 | retry: | |
c3d17b63 JL |
1888 | while (!done && index <= end) { |
1889 | unsigned int i, nr_pages, found_pages; | |
1890 | pgoff_t next = 0, tofind; | |
1891 | struct page **pages; | |
1892 | ||
1893 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1894 | end - index) + 1; | |
1895 | ||
c2e87640 JL |
1896 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1897 | cifs_writev_complete); | |
c3d17b63 JL |
1898 | if (!wdata) { |
1899 | rc = -ENOMEM; | |
1900 | break; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * find_get_pages_tag seems to return a max of 256 on each | |
1905 | * iteration, so we must call it several times in order to | |
1906 | * fill the array or the wsize is effectively limited to | |
1907 | * 256 * PAGE_CACHE_SIZE. | |
1908 | */ | |
1909 | found_pages = 0; | |
1910 | pages = wdata->pages; | |
1911 | do { | |
1912 | nr_pages = find_get_pages_tag(mapping, &index, | |
1913 | PAGECACHE_TAG_DIRTY, | |
1914 | tofind, pages); | |
1915 | found_pages += nr_pages; | |
1916 | tofind -= nr_pages; | |
1917 | pages += nr_pages; | |
1918 | } while (nr_pages && tofind && index <= end); | |
1919 | ||
1920 | if (found_pages == 0) { | |
1921 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | nr_pages = 0; | |
1926 | for (i = 0; i < found_pages; i++) { | |
1927 | page = wdata->pages[i]; | |
37c0eb46 SF |
1928 | /* |
1929 | * At this point we hold neither mapping->tree_lock nor | |
1930 | * lock on the page itself: the page may be truncated or | |
1931 | * invalidated (changing page->mapping to NULL), or even | |
1932 | * swizzled back from swapper_space to tmpfs file | |
1933 | * mapping | |
1934 | */ | |
1935 | ||
c3d17b63 | 1936 | if (nr_pages == 0) |
37c0eb46 | 1937 | lock_page(page); |
529ae9aa | 1938 | else if (!trylock_page(page)) |
37c0eb46 SF |
1939 | break; |
1940 | ||
1941 | if (unlikely(page->mapping != mapping)) { | |
1942 | unlock_page(page); | |
1943 | break; | |
1944 | } | |
1945 | ||
111ebb6e | 1946 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1947 | done = true; |
37c0eb46 SF |
1948 | unlock_page(page); |
1949 | break; | |
1950 | } | |
1951 | ||
1952 | if (next && (page->index != next)) { | |
1953 | /* Not next consecutive page */ | |
1954 | unlock_page(page); | |
1955 | break; | |
1956 | } | |
1957 | ||
1958 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1959 | wait_on_page_writeback(page); | |
1960 | ||
1961 | if (PageWriteback(page) || | |
cb876f45 | 1962 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1963 | unlock_page(page); |
1964 | break; | |
1965 | } | |
84d2f07e | 1966 | |
cb876f45 LT |
1967 | /* |
1968 | * This actually clears the dirty bit in the radix tree. | |
1969 | * See cifs_writepage() for more commentary. | |
1970 | */ | |
1971 | set_page_writeback(page); | |
1972 | ||
3a98b861 | 1973 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1974 | done = true; |
84d2f07e | 1975 | unlock_page(page); |
cb876f45 | 1976 | end_page_writeback(page); |
84d2f07e SF |
1977 | break; |
1978 | } | |
1979 | ||
c3d17b63 JL |
1980 | wdata->pages[i] = page; |
1981 | next = page->index + 1; | |
1982 | ++nr_pages; | |
1983 | } | |
37c0eb46 | 1984 | |
c3d17b63 JL |
1985 | /* reset index to refind any pages skipped */ |
1986 | if (nr_pages == 0) | |
1987 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1988 | |
c3d17b63 JL |
1989 | /* put any pages we aren't going to use */ |
1990 | for (i = nr_pages; i < found_pages; i++) { | |
1991 | page_cache_release(wdata->pages[i]); | |
1992 | wdata->pages[i] = NULL; | |
1993 | } | |
37c0eb46 | 1994 | |
c3d17b63 JL |
1995 | /* nothing to write? */ |
1996 | if (nr_pages == 0) { | |
1997 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1998 | continue; | |
37c0eb46 | 1999 | } |
fbec9ab9 | 2000 | |
c3d17b63 JL |
2001 | wdata->sync_mode = wbc->sync_mode; |
2002 | wdata->nr_pages = nr_pages; | |
2003 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
2004 | wdata->pagesz = PAGE_CACHE_SIZE; |
2005 | wdata->tailsz = | |
3a98b861 JL |
2006 | min(i_size_read(mapping->host) - |
2007 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
2008 | (loff_t)PAGE_CACHE_SIZE); |
2009 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
2010 | wdata->tailsz; | |
941b853d | 2011 | |
c3d17b63 JL |
2012 | do { |
2013 | if (wdata->cfile != NULL) | |
2014 | cifsFileInfo_put(wdata->cfile); | |
2015 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
2016 | false); | |
2017 | if (!wdata->cfile) { | |
2018 | cERROR(1, "No writable handles for inode"); | |
2019 | rc = -EBADF; | |
2020 | break; | |
941b853d | 2021 | } |
fe5f5d2e | 2022 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
2023 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
2024 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 2025 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 2026 | |
c3d17b63 JL |
2027 | for (i = 0; i < nr_pages; ++i) |
2028 | unlock_page(wdata->pages[i]); | |
f3983c21 | 2029 | |
c3d17b63 JL |
2030 | /* send failure -- clean up the mess */ |
2031 | if (rc != 0) { | |
2032 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2033 | if (rc == -EAGAIN) |
c3d17b63 JL |
2034 | redirty_page_for_writepage(wbc, |
2035 | wdata->pages[i]); | |
2036 | else | |
2037 | SetPageError(wdata->pages[i]); | |
2038 | end_page_writeback(wdata->pages[i]); | |
2039 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2040 | } |
941b853d JL |
2041 | if (rc != -EAGAIN) |
2042 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2043 | } |
2044 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2045 | |
c3d17b63 JL |
2046 | wbc->nr_to_write -= nr_pages; |
2047 | if (wbc->nr_to_write <= 0) | |
2048 | done = true; | |
b066a48c | 2049 | |
c3d17b63 | 2050 | index = next; |
37c0eb46 | 2051 | } |
c3d17b63 | 2052 | |
37c0eb46 SF |
2053 | if (!scanned && !done) { |
2054 | /* | |
2055 | * We hit the last page and there is more work to be done: wrap | |
2056 | * back to the start of the file | |
2057 | */ | |
c3d17b63 | 2058 | scanned = true; |
37c0eb46 SF |
2059 | index = 0; |
2060 | goto retry; | |
2061 | } | |
c3d17b63 | 2062 | |
111ebb6e | 2063 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2064 | mapping->writeback_index = index; |
2065 | ||
1da177e4 LT |
2066 | return rc; |
2067 | } | |
1da177e4 | 2068 | |
9ad1506b PS |
2069 | static int |
2070 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2071 | { |
9ad1506b | 2072 | int rc; |
6d5786a3 | 2073 | unsigned int xid; |
1da177e4 | 2074 | |
6d5786a3 | 2075 | xid = get_xid(); |
1da177e4 LT |
2076 | /* BB add check for wbc flags */ |
2077 | page_cache_get(page); | |
ad7a2926 | 2078 | if (!PageUptodate(page)) |
b6b38f70 | 2079 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
2080 | |
2081 | /* | |
2082 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2083 | * | |
2084 | * A writepage() implementation always needs to do either this, | |
2085 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2086 | * the case of a failure. | |
2087 | * | |
2088 | * Just unlocking the page will cause the radix tree tag-bits | |
2089 | * to fail to update with the state of the page correctly. | |
2090 | */ | |
fb8c4b14 | 2091 | set_page_writeback(page); |
9ad1506b | 2092 | retry_write: |
1da177e4 | 2093 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2094 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2095 | goto retry_write; | |
2096 | else if (rc == -EAGAIN) | |
2097 | redirty_page_for_writepage(wbc, page); | |
2098 | else if (rc != 0) | |
2099 | SetPageError(page); | |
2100 | else | |
2101 | SetPageUptodate(page); | |
cb876f45 LT |
2102 | end_page_writeback(page); |
2103 | page_cache_release(page); | |
6d5786a3 | 2104 | free_xid(xid); |
1da177e4 LT |
2105 | return rc; |
2106 | } | |
2107 | ||
9ad1506b PS |
2108 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2109 | { | |
2110 | int rc = cifs_writepage_locked(page, wbc); | |
2111 | unlock_page(page); | |
2112 | return rc; | |
2113 | } | |
2114 | ||
d9414774 NP |
2115 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2116 | loff_t pos, unsigned len, unsigned copied, | |
2117 | struct page *page, void *fsdata) | |
1da177e4 | 2118 | { |
d9414774 NP |
2119 | int rc; |
2120 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2121 | struct cifsFileInfo *cfile = file->private_data; |
2122 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2123 | __u32 pid; | |
2124 | ||
2125 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2126 | pid = cfile->pid; | |
2127 | else | |
2128 | pid = current->tgid; | |
1da177e4 | 2129 | |
b6b38f70 JP |
2130 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2131 | page, pos, copied); | |
d9414774 | 2132 | |
a98ee8c1 JL |
2133 | if (PageChecked(page)) { |
2134 | if (copied == len) | |
2135 | SetPageUptodate(page); | |
2136 | ClearPageChecked(page); | |
2137 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2138 | SetPageUptodate(page); |
ad7a2926 | 2139 | |
1da177e4 | 2140 | if (!PageUptodate(page)) { |
d9414774 NP |
2141 | char *page_data; |
2142 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2143 | unsigned int xid; |
d9414774 | 2144 | |
6d5786a3 | 2145 | xid = get_xid(); |
1da177e4 LT |
2146 | /* this is probably better than directly calling |
2147 | partialpage_write since in this function the file handle is | |
2148 | known which we might as well leverage */ | |
2149 | /* BB check if anything else missing out of ppw | |
2150 | such as updating last write time */ | |
2151 | page_data = kmap(page); | |
d4ffff1f | 2152 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2153 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2154 | kunmap(page); |
d9414774 | 2155 | |
6d5786a3 | 2156 | free_xid(xid); |
fb8c4b14 | 2157 | } else { |
d9414774 NP |
2158 | rc = copied; |
2159 | pos += copied; | |
ca8aa29c | 2160 | set_page_dirty(page); |
1da177e4 LT |
2161 | } |
2162 | ||
d9414774 NP |
2163 | if (rc > 0) { |
2164 | spin_lock(&inode->i_lock); | |
2165 | if (pos > inode->i_size) | |
2166 | i_size_write(inode, pos); | |
2167 | spin_unlock(&inode->i_lock); | |
2168 | } | |
2169 | ||
2170 | unlock_page(page); | |
2171 | page_cache_release(page); | |
2172 | ||
1da177e4 LT |
2173 | return rc; |
2174 | } | |
2175 | ||
02c24a82 JB |
2176 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2177 | int datasync) | |
1da177e4 | 2178 | { |
6d5786a3 | 2179 | unsigned int xid; |
1da177e4 | 2180 | int rc = 0; |
96daf2b0 | 2181 | struct cifs_tcon *tcon; |
1d8c4c00 | 2182 | struct TCP_Server_Info *server; |
c21dfb69 | 2183 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2184 | struct inode *inode = file_inode(file); |
8be7e6ba | 2185 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2186 | |
02c24a82 JB |
2187 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2188 | if (rc) | |
2189 | return rc; | |
2190 | mutex_lock(&inode->i_mutex); | |
2191 | ||
6d5786a3 | 2192 | xid = get_xid(); |
1da177e4 | 2193 | |
b6b38f70 | 2194 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2195 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2196 | |
6feb9891 PS |
2197 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2198 | rc = cifs_invalidate_mapping(inode); | |
2199 | if (rc) { | |
2200 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2201 | rc = 0; /* don't care about it in fsync */ | |
2202 | } | |
2203 | } | |
eb4b756b | 2204 | |
8be7e6ba | 2205 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2206 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2207 | server = tcon->ses->server; | |
2208 | if (server->ops->flush) | |
2209 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2210 | else | |
2211 | rc = -ENOSYS; | |
2212 | } | |
8be7e6ba | 2213 | |
6d5786a3 | 2214 | free_xid(xid); |
02c24a82 | 2215 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2216 | return rc; |
2217 | } | |
2218 | ||
02c24a82 | 2219 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2220 | { |
6d5786a3 | 2221 | unsigned int xid; |
8be7e6ba | 2222 | int rc = 0; |
96daf2b0 | 2223 | struct cifs_tcon *tcon; |
1d8c4c00 | 2224 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2225 | struct cifsFileInfo *smbfile = file->private_data; |
2226 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2227 | struct inode *inode = file->f_mapping->host; |
2228 | ||
2229 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2230 | if (rc) | |
2231 | return rc; | |
2232 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2233 | |
6d5786a3 | 2234 | xid = get_xid(); |
8be7e6ba PS |
2235 | |
2236 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2237 | file->f_path.dentry->d_name.name, datasync); | |
2238 | ||
2239 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2240 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2241 | server = tcon->ses->server; | |
2242 | if (server->ops->flush) | |
2243 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2244 | else | |
2245 | rc = -ENOSYS; | |
2246 | } | |
b298f223 | 2247 | |
6d5786a3 | 2248 | free_xid(xid); |
02c24a82 | 2249 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2250 | return rc; |
2251 | } | |
2252 | ||
1da177e4 LT |
2253 | /* |
2254 | * As file closes, flush all cached write data for this inode checking | |
2255 | * for write behind errors. | |
2256 | */ | |
75e1fcc0 | 2257 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2258 | { |
496ad9aa | 2259 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2260 | int rc = 0; |
2261 | ||
eb4b756b | 2262 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2263 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2264 | |
b6b38f70 | 2265 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2266 | |
2267 | return rc; | |
2268 | } | |
2269 | ||
72432ffc PS |
2270 | static int |
2271 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2272 | { | |
2273 | int rc = 0; | |
2274 | unsigned long i; | |
2275 | ||
2276 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2277 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2278 | if (!pages[i]) { |
2279 | /* | |
2280 | * save number of pages we have already allocated and | |
2281 | * return with ENOMEM error | |
2282 | */ | |
2283 | num_pages = i; | |
2284 | rc = -ENOMEM; | |
e94f7ba1 | 2285 | break; |
72432ffc PS |
2286 | } |
2287 | } | |
2288 | ||
e94f7ba1 JL |
2289 | if (rc) { |
2290 | for (i = 0; i < num_pages; i++) | |
2291 | put_page(pages[i]); | |
2292 | } | |
72432ffc PS |
2293 | return rc; |
2294 | } | |
2295 | ||
2296 | static inline | |
2297 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2298 | { | |
2299 | size_t num_pages; | |
2300 | size_t clen; | |
2301 | ||
2302 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2303 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2304 | |
2305 | if (cur_len) | |
2306 | *cur_len = clen; | |
2307 | ||
2308 | return num_pages; | |
2309 | } | |
2310 | ||
da82f7e7 JL |
2311 | static void |
2312 | cifs_uncached_writev_complete(struct work_struct *work) | |
2313 | { | |
2314 | int i; | |
2315 | struct cifs_writedata *wdata = container_of(work, | |
2316 | struct cifs_writedata, work); | |
2317 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2318 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2319 | ||
2320 | spin_lock(&inode->i_lock); | |
2321 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2322 | if (cifsi->server_eof > inode->i_size) | |
2323 | i_size_write(inode, cifsi->server_eof); | |
2324 | spin_unlock(&inode->i_lock); | |
2325 | ||
2326 | complete(&wdata->done); | |
2327 | ||
2328 | if (wdata->result != -EAGAIN) { | |
2329 | for (i = 0; i < wdata->nr_pages; i++) | |
2330 | put_page(wdata->pages[i]); | |
2331 | } | |
2332 | ||
2333 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2334 | } | |
2335 | ||
2336 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2337 | static int | |
2338 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2339 | { | |
2340 | int rc; | |
c9de5c80 PS |
2341 | struct TCP_Server_Info *server; |
2342 | ||
2343 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2344 | |
2345 | do { | |
2346 | if (wdata->cfile->invalidHandle) { | |
2347 | rc = cifs_reopen_file(wdata->cfile, false); | |
2348 | if (rc != 0) | |
2349 | continue; | |
2350 | } | |
c9de5c80 | 2351 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2352 | } while (rc == -EAGAIN); |
2353 | ||
2354 | return rc; | |
2355 | } | |
2356 | ||
72432ffc PS |
2357 | static ssize_t |
2358 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2359 | unsigned long nr_segs, loff_t *poffset) | |
2360 | { | |
da82f7e7 | 2361 | unsigned long nr_pages, i; |
76429c14 PS |
2362 | size_t copied, len, cur_len; |
2363 | ssize_t total_written = 0; | |
3af9d8f2 | 2364 | loff_t offset; |
72432ffc | 2365 | struct iov_iter it; |
72432ffc | 2366 | struct cifsFileInfo *open_file; |
da82f7e7 | 2367 | struct cifs_tcon *tcon; |
72432ffc | 2368 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2369 | struct cifs_writedata *wdata, *tmp; |
2370 | struct list_head wdata_list; | |
2371 | int rc; | |
2372 | pid_t pid; | |
72432ffc PS |
2373 | |
2374 | len = iov_length(iov, nr_segs); | |
2375 | if (!len) | |
2376 | return 0; | |
2377 | ||
2378 | rc = generic_write_checks(file, poffset, &len, 0); | |
2379 | if (rc) | |
2380 | return rc; | |
2381 | ||
da82f7e7 | 2382 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2383 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2384 | open_file = file->private_data; |
da82f7e7 | 2385 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2386 | |
2387 | if (!tcon->ses->server->ops->async_writev) | |
2388 | return -ENOSYS; | |
2389 | ||
3af9d8f2 | 2390 | offset = *poffset; |
d4ffff1f PS |
2391 | |
2392 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2393 | pid = open_file->pid; | |
2394 | else | |
2395 | pid = current->tgid; | |
2396 | ||
72432ffc | 2397 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2398 | do { |
da82f7e7 JL |
2399 | size_t save_len; |
2400 | ||
2401 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2402 | wdata = cifs_writedata_alloc(nr_pages, | |
2403 | cifs_uncached_writev_complete); | |
2404 | if (!wdata) { | |
2405 | rc = -ENOMEM; | |
2406 | break; | |
2407 | } | |
2408 | ||
2409 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2410 | if (rc) { | |
2411 | kfree(wdata); | |
2412 | break; | |
2413 | } | |
2414 | ||
2415 | save_len = cur_len; | |
2416 | for (i = 0; i < nr_pages; i++) { | |
2417 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2418 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2419 | 0, copied); | |
72432ffc PS |
2420 | cur_len -= copied; |
2421 | iov_iter_advance(&it, copied); | |
72432ffc | 2422 | } |
72432ffc PS |
2423 | cur_len = save_len - cur_len; |
2424 | ||
da82f7e7 JL |
2425 | wdata->sync_mode = WB_SYNC_ALL; |
2426 | wdata->nr_pages = nr_pages; | |
2427 | wdata->offset = (__u64)offset; | |
2428 | wdata->cfile = cifsFileInfo_get(open_file); | |
2429 | wdata->pid = pid; | |
2430 | wdata->bytes = cur_len; | |
eddb079d JL |
2431 | wdata->pagesz = PAGE_SIZE; |
2432 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2433 | rc = cifs_uncached_retry_writev(wdata); |
2434 | if (rc) { | |
2435 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2436 | break; |
2437 | } | |
2438 | ||
da82f7e7 JL |
2439 | list_add_tail(&wdata->list, &wdata_list); |
2440 | offset += cur_len; | |
2441 | len -= cur_len; | |
72432ffc PS |
2442 | } while (len > 0); |
2443 | ||
da82f7e7 JL |
2444 | /* |
2445 | * If at least one write was successfully sent, then discard any rc | |
2446 | * value from the later writes. If the other write succeeds, then | |
2447 | * we'll end up returning whatever was written. If it fails, then | |
2448 | * we'll get a new rc value from that. | |
2449 | */ | |
2450 | if (!list_empty(&wdata_list)) | |
2451 | rc = 0; | |
2452 | ||
2453 | /* | |
2454 | * Wait for and collect replies for any successful sends in order of | |
2455 | * increasing offset. Once an error is hit or we get a fatal signal | |
2456 | * while waiting, then return without waiting for any more replies. | |
2457 | */ | |
2458 | restart_loop: | |
2459 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2460 | if (!rc) { | |
2461 | /* FIXME: freezable too? */ | |
2462 | rc = wait_for_completion_killable(&wdata->done); | |
2463 | if (rc) | |
2464 | rc = -EINTR; | |
2465 | else if (wdata->result) | |
2466 | rc = wdata->result; | |
2467 | else | |
2468 | total_written += wdata->bytes; | |
2469 | ||
2470 | /* resend call if it's a retryable error */ | |
2471 | if (rc == -EAGAIN) { | |
2472 | rc = cifs_uncached_retry_writev(wdata); | |
2473 | goto restart_loop; | |
2474 | } | |
2475 | } | |
2476 | list_del_init(&wdata->list); | |
2477 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2478 | } |
2479 | ||
da82f7e7 JL |
2480 | if (total_written > 0) |
2481 | *poffset += total_written; | |
72432ffc | 2482 | |
da82f7e7 JL |
2483 | cifs_stats_bytes_written(tcon, total_written); |
2484 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2485 | } |
2486 | ||
0b81c1c4 | 2487 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2488 | unsigned long nr_segs, loff_t pos) |
2489 | { | |
2490 | ssize_t written; | |
2491 | struct inode *inode; | |
2492 | ||
496ad9aa | 2493 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2494 | |
2495 | /* | |
2496 | * BB - optimize the way when signing is disabled. We can drop this | |
2497 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2498 | * write request. | |
2499 | */ | |
2500 | ||
2501 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2502 | if (written > 0) { | |
2503 | CIFS_I(inode)->invalid_mapping = true; | |
2504 | iocb->ki_pos = pos; | |
2505 | } | |
2506 | ||
2507 | return written; | |
2508 | } | |
2509 | ||
579f9053 | 2510 | static ssize_t |
ca8aa29c PS |
2511 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, |
2512 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2513 | { |
579f9053 PS |
2514 | struct file *file = iocb->ki_filp; |
2515 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2516 | struct inode *inode = file->f_mapping->host; | |
2517 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2518 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2519 | ssize_t rc = -EACCES; | |
72432ffc | 2520 | |
579f9053 | 2521 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2522 | |
579f9053 PS |
2523 | sb_start_write(inode->i_sb); |
2524 | ||
2525 | /* | |
2526 | * We need to hold the sem to be sure nobody modifies lock list | |
2527 | * with a brlock that prevents writing. | |
2528 | */ | |
2529 | down_read(&cinode->lock_sem); | |
2530 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2531 | server->vals->exclusive_lock_type, NULL, | |
081c0414 | 2532 | CIFS_WRITE_OP)) { |
579f9053 PS |
2533 | mutex_lock(&inode->i_mutex); |
2534 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
ca8aa29c | 2535 | &iocb->ki_pos); |
579f9053 PS |
2536 | mutex_unlock(&inode->i_mutex); |
2537 | } | |
2538 | ||
2539 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2540 | ssize_t err; | |
2541 | ||
2542 | err = generic_write_sync(file, pos, rc); | |
2543 | if (err < 0 && rc > 0) | |
2544 | rc = err; | |
2545 | } | |
2546 | ||
2547 | up_read(&cinode->lock_sem); | |
2548 | sb_end_write(inode->i_sb); | |
2549 | return rc; | |
2550 | } | |
2551 | ||
2552 | ssize_t | |
2553 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2554 | unsigned long nr_segs, loff_t pos) | |
2555 | { | |
496ad9aa | 2556 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2557 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2558 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2559 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2560 | iocb->ki_filp->private_data; | |
2561 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2562 | ssize_t written; |
ca8aa29c | 2563 | |
88cf75aa PS |
2564 | if (cinode->clientCanCacheAll) { |
2565 | if (cap_unix(tcon->ses) && | |
2566 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
2567 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2568 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2569 | return cifs_writev(iocb, iov, nr_segs, pos); | |
25078105 | 2570 | } |
25078105 | 2571 | /* |
ca8aa29c PS |
2572 | * For non-oplocked files in strict cache mode we need to write the data |
2573 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2574 | * affected pages because it may cause a error with mandatory locks on | |
2575 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2576 | */ |
88cf75aa PS |
2577 | written = cifs_user_writev(iocb, iov, nr_segs, pos); |
2578 | if (written > 0 && cinode->clientCanCacheRead) { | |
2579 | /* | |
2580 | * Windows 7 server can delay breaking level2 oplock if a write | |
2581 | * request comes - break it on the client to prevent reading | |
2582 | * an old data. | |
2583 | */ | |
2584 | cifs_invalidate_mapping(inode); | |
2585 | cFYI(1, "Set no oplock for inode=%p after a write operation", | |
2586 | inode); | |
2587 | cinode->clientCanCacheRead = false; | |
2588 | } | |
2589 | return written; | |
72432ffc PS |
2590 | } |
2591 | ||
0471ca3f | 2592 | static struct cifs_readdata * |
f4e49cd2 | 2593 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2594 | { |
2595 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2596 | |
c5fab6f4 JL |
2597 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2598 | GFP_KERNEL); | |
0471ca3f | 2599 | if (rdata != NULL) { |
6993f74a | 2600 | kref_init(&rdata->refcount); |
1c892549 JL |
2601 | INIT_LIST_HEAD(&rdata->list); |
2602 | init_completion(&rdata->done); | |
0471ca3f | 2603 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2604 | } |
f4e49cd2 | 2605 | |
0471ca3f JL |
2606 | return rdata; |
2607 | } | |
2608 | ||
6993f74a JL |
2609 | void |
2610 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2611 | { |
6993f74a JL |
2612 | struct cifs_readdata *rdata = container_of(refcount, |
2613 | struct cifs_readdata, refcount); | |
2614 | ||
2615 | if (rdata->cfile) | |
2616 | cifsFileInfo_put(rdata->cfile); | |
2617 | ||
0471ca3f JL |
2618 | kfree(rdata); |
2619 | } | |
2620 | ||
1c892549 | 2621 | static int |
c5fab6f4 | 2622 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2623 | { |
2624 | int rc = 0; | |
c5fab6f4 | 2625 | struct page *page; |
1c892549 JL |
2626 | unsigned int i; |
2627 | ||
c5fab6f4 | 2628 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2629 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2630 | if (!page) { | |
2631 | rc = -ENOMEM; | |
2632 | break; | |
2633 | } | |
c5fab6f4 | 2634 | rdata->pages[i] = page; |
1c892549 JL |
2635 | } |
2636 | ||
2637 | if (rc) { | |
c5fab6f4 JL |
2638 | for (i = 0; i < nr_pages; i++) { |
2639 | put_page(rdata->pages[i]); | |
2640 | rdata->pages[i] = NULL; | |
1c892549 JL |
2641 | } |
2642 | } | |
2643 | return rc; | |
2644 | } | |
2645 | ||
2646 | static void | |
2647 | cifs_uncached_readdata_release(struct kref *refcount) | |
2648 | { | |
1c892549 JL |
2649 | struct cifs_readdata *rdata = container_of(refcount, |
2650 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2651 | unsigned int i; |
1c892549 | 2652 | |
c5fab6f4 JL |
2653 | for (i = 0; i < rdata->nr_pages; i++) { |
2654 | put_page(rdata->pages[i]); | |
2655 | rdata->pages[i] = NULL; | |
1c892549 JL |
2656 | } |
2657 | cifs_readdata_release(refcount); | |
2658 | } | |
2659 | ||
2a1bb138 JL |
2660 | static int |
2661 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2662 | { | |
2663 | int rc; | |
fc9c5966 PS |
2664 | struct TCP_Server_Info *server; |
2665 | ||
2666 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2667 | |
2668 | do { | |
2669 | if (rdata->cfile->invalidHandle) { | |
2670 | rc = cifs_reopen_file(rdata->cfile, true); | |
2671 | if (rc != 0) | |
2672 | continue; | |
2673 | } | |
fc9c5966 | 2674 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2675 | } while (rc == -EAGAIN); |
2676 | ||
2677 | return rc; | |
2678 | } | |
2679 | ||
1c892549 JL |
2680 | /** |
2681 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2682 | * @rdata: the readdata response with list of pages holding data | |
2683 | * @iov: vector in which we should copy the data | |
2684 | * @nr_segs: number of segments in vector | |
2685 | * @offset: offset into file of the first iovec | |
2686 | * @copied: used to return the amount of data copied to the iov | |
2687 | * | |
2688 | * This function copies data from a list of pages in a readdata response into | |
2689 | * an array of iovecs. It will first calculate where the data should go | |
2690 | * based on the info in the readdata and then copy the data into that spot. | |
2691 | */ | |
2692 | static ssize_t | |
2693 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2694 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2695 | { | |
2696 | int rc = 0; | |
2697 | struct iov_iter ii; | |
2698 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2699 | ssize_t remaining = rdata->bytes; |
2700 | unsigned char *pdata; | |
c5fab6f4 | 2701 | unsigned int i; |
1c892549 JL |
2702 | |
2703 | /* set up iov_iter and advance to the correct offset */ | |
2704 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2705 | iov_iter_advance(&ii, pos); | |
2706 | ||
2707 | *copied = 0; | |
c5fab6f4 | 2708 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2709 | ssize_t copy; |
c5fab6f4 | 2710 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2711 | |
2712 | /* copy a whole page or whatever's left */ | |
2713 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2714 | ||
2715 | /* ...but limit it to whatever space is left in the iov */ | |
2716 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2717 | ||
2718 | /* go while there's data to be copied and no errors */ | |
2719 | if (copy && !rc) { | |
2720 | pdata = kmap(page); | |
2721 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2722 | (int)copy); | |
2723 | kunmap(page); | |
2724 | if (!rc) { | |
2725 | *copied += copy; | |
2726 | remaining -= copy; | |
2727 | iov_iter_advance(&ii, copy); | |
2728 | } | |
2729 | } | |
1c892549 JL |
2730 | } |
2731 | ||
2732 | return rc; | |
2733 | } | |
2734 | ||
2735 | static void | |
2736 | cifs_uncached_readv_complete(struct work_struct *work) | |
2737 | { | |
2738 | struct cifs_readdata *rdata = container_of(work, | |
2739 | struct cifs_readdata, work); | |
1c892549 JL |
2740 | |
2741 | complete(&rdata->done); | |
2742 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2743 | } | |
2744 | ||
2745 | static int | |
8321fec4 JL |
2746 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2747 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2748 | { |
8321fec4 | 2749 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2750 | unsigned int i; |
2751 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2752 | struct kvec iov; |
1c892549 | 2753 | |
8321fec4 | 2754 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2755 | for (i = 0; i < nr_pages; i++) { |
2756 | struct page *page = rdata->pages[i]; | |
2757 | ||
8321fec4 | 2758 | if (len >= PAGE_SIZE) { |
1c892549 | 2759 | /* enough data to fill the page */ |
8321fec4 JL |
2760 | iov.iov_base = kmap(page); |
2761 | iov.iov_len = PAGE_SIZE; | |
2762 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2763 | i, iov.iov_base, iov.iov_len); | |
2764 | len -= PAGE_SIZE; | |
2765 | } else if (len > 0) { | |
1c892549 | 2766 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2767 | iov.iov_base = kmap(page); |
2768 | iov.iov_len = len; | |
2769 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2770 | i, iov.iov_base, iov.iov_len); | |
2771 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2772 | rdata->tailsz = len; | |
2773 | len = 0; | |
1c892549 JL |
2774 | } else { |
2775 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2776 | rdata->pages[i] = NULL; |
2777 | rdata->nr_pages--; | |
1c892549 | 2778 | put_page(page); |
8321fec4 | 2779 | continue; |
1c892549 | 2780 | } |
8321fec4 JL |
2781 | |
2782 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2783 | kunmap(page); | |
2784 | if (result < 0) | |
2785 | break; | |
2786 | ||
2787 | total_read += result; | |
1c892549 JL |
2788 | } |
2789 | ||
8321fec4 | 2790 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2791 | } |
2792 | ||
a70307ee PS |
2793 | static ssize_t |
2794 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2795 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2796 | { |
1c892549 | 2797 | ssize_t rc; |
a70307ee | 2798 | size_t len, cur_len; |
1c892549 JL |
2799 | ssize_t total_read = 0; |
2800 | loff_t offset = *poffset; | |
2801 | unsigned int npages; | |
1da177e4 | 2802 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2803 | struct cifs_tcon *tcon; |
1da177e4 | 2804 | struct cifsFileInfo *open_file; |
1c892549 JL |
2805 | struct cifs_readdata *rdata, *tmp; |
2806 | struct list_head rdata_list; | |
2807 | pid_t pid; | |
a70307ee PS |
2808 | |
2809 | if (!nr_segs) | |
2810 | return 0; | |
2811 | ||
2812 | len = iov_length(iov, nr_segs); | |
2813 | if (!len) | |
2814 | return 0; | |
1da177e4 | 2815 | |
1c892549 | 2816 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2817 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2818 | open_file = file->private_data; |
1c892549 | 2819 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2820 | |
fc9c5966 PS |
2821 | if (!tcon->ses->server->ops->async_readv) |
2822 | return -ENOSYS; | |
2823 | ||
d4ffff1f PS |
2824 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2825 | pid = open_file->pid; | |
2826 | else | |
2827 | pid = current->tgid; | |
2828 | ||
ad7a2926 | 2829 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2830 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2831 | |
1c892549 JL |
2832 | do { |
2833 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2834 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2835 | |
1c892549 JL |
2836 | /* allocate a readdata struct */ |
2837 | rdata = cifs_readdata_alloc(npages, | |
2838 | cifs_uncached_readv_complete); | |
2839 | if (!rdata) { | |
2840 | rc = -ENOMEM; | |
2841 | goto error; | |
1da177e4 | 2842 | } |
a70307ee | 2843 | |
c5fab6f4 | 2844 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2845 | if (rc) |
2846 | goto error; | |
2847 | ||
2848 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2849 | rdata->nr_pages = npages; |
1c892549 JL |
2850 | rdata->offset = offset; |
2851 | rdata->bytes = cur_len; | |
2852 | rdata->pid = pid; | |
8321fec4 JL |
2853 | rdata->pagesz = PAGE_SIZE; |
2854 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2855 | |
2856 | rc = cifs_retry_async_readv(rdata); | |
2857 | error: | |
2858 | if (rc) { | |
2859 | kref_put(&rdata->refcount, | |
2860 | cifs_uncached_readdata_release); | |
2861 | break; | |
2862 | } | |
2863 | ||
2864 | list_add_tail(&rdata->list, &rdata_list); | |
2865 | offset += cur_len; | |
2866 | len -= cur_len; | |
2867 | } while (len > 0); | |
2868 | ||
2869 | /* if at least one read request send succeeded, then reset rc */ | |
2870 | if (!list_empty(&rdata_list)) | |
2871 | rc = 0; | |
2872 | ||
2873 | /* the loop below should proceed in the order of increasing offsets */ | |
2874 | restart_loop: | |
2875 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2876 | if (!rc) { | |
2877 | ssize_t copied; | |
2878 | ||
2879 | /* FIXME: freezable sleep too? */ | |
2880 | rc = wait_for_completion_killable(&rdata->done); | |
2881 | if (rc) | |
2882 | rc = -EINTR; | |
2883 | else if (rdata->result) | |
2884 | rc = rdata->result; | |
2885 | else { | |
2886 | rc = cifs_readdata_to_iov(rdata, iov, | |
2887 | nr_segs, *poffset, | |
2888 | &copied); | |
2889 | total_read += copied; | |
2890 | } | |
2891 | ||
2892 | /* resend call if it's a retryable error */ | |
2893 | if (rc == -EAGAIN) { | |
2894 | rc = cifs_retry_async_readv(rdata); | |
2895 | goto restart_loop; | |
1da177e4 | 2896 | } |
1da177e4 | 2897 | } |
1c892549 JL |
2898 | list_del_init(&rdata->list); |
2899 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2900 | } |
a70307ee | 2901 | |
1c892549 JL |
2902 | cifs_stats_bytes_read(tcon, total_read); |
2903 | *poffset += total_read; | |
2904 | ||
09a4707e PS |
2905 | /* mask nodata case */ |
2906 | if (rc == -ENODATA) | |
2907 | rc = 0; | |
2908 | ||
1c892549 | 2909 | return total_read ? total_read : rc; |
1da177e4 LT |
2910 | } |
2911 | ||
0b81c1c4 | 2912 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2913 | unsigned long nr_segs, loff_t pos) |
2914 | { | |
2915 | ssize_t read; | |
2916 | ||
2917 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2918 | if (read > 0) | |
2919 | iocb->ki_pos = pos; | |
2920 | ||
2921 | return read; | |
2922 | } | |
2923 | ||
579f9053 PS |
2924 | ssize_t |
2925 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2926 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2927 | { |
496ad9aa | 2928 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2929 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2930 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2931 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2932 | iocb->ki_filp->private_data; | |
2933 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2934 | int rc = -EACCES; | |
a70307ee PS |
2935 | |
2936 | /* | |
2937 | * In strict cache mode we need to read from the server all the time | |
2938 | * if we don't have level II oplock because the server can delay mtime | |
2939 | * change - so we can't make a decision about inode invalidating. | |
2940 | * And we can also fail with pagereading if there are mandatory locks | |
2941 | * on pages affected by this read but not on the region from pos to | |
2942 | * pos+len-1. | |
2943 | */ | |
579f9053 PS |
2944 | if (!cinode->clientCanCacheRead) |
2945 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2946 | |
579f9053 PS |
2947 | if (cap_unix(tcon->ses) && |
2948 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2949 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2950 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2951 | ||
2952 | /* | |
2953 | * We need to hold the sem to be sure nobody modifies lock list | |
2954 | * with a brlock that prevents reading. | |
2955 | */ | |
2956 | down_read(&cinode->lock_sem); | |
2957 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2958 | tcon->ses->server->vals->shared_lock_type, | |
081c0414 | 2959 | NULL, CIFS_READ_OP)) |
579f9053 PS |
2960 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); |
2961 | up_read(&cinode->lock_sem); | |
2962 | return rc; | |
a70307ee | 2963 | } |
1da177e4 | 2964 | |
f9c6e234 PS |
2965 | static ssize_t |
2966 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2967 | { |
2968 | int rc = -EACCES; | |
2969 | unsigned int bytes_read = 0; | |
2970 | unsigned int total_read; | |
2971 | unsigned int current_read_size; | |
5eba8ab3 | 2972 | unsigned int rsize; |
1da177e4 | 2973 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2974 | struct cifs_tcon *tcon; |
f9c6e234 | 2975 | struct TCP_Server_Info *server; |
6d5786a3 | 2976 | unsigned int xid; |
f9c6e234 | 2977 | char *cur_offset; |
1da177e4 | 2978 | struct cifsFileInfo *open_file; |
d4ffff1f | 2979 | struct cifs_io_parms io_parms; |
ec637e3f | 2980 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2981 | __u32 pid; |
1da177e4 | 2982 | |
6d5786a3 | 2983 | xid = get_xid(); |
e6a00296 | 2984 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2985 | |
5eba8ab3 JL |
2986 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2987 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2988 | ||
1da177e4 | 2989 | if (file->private_data == NULL) { |
0f3bc09e | 2990 | rc = -EBADF; |
6d5786a3 | 2991 | free_xid(xid); |
0f3bc09e | 2992 | return rc; |
1da177e4 | 2993 | } |
c21dfb69 | 2994 | open_file = file->private_data; |
29e20f9c | 2995 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2996 | server = tcon->ses->server; |
2997 | ||
2998 | if (!server->ops->sync_read) { | |
2999 | free_xid(xid); | |
3000 | return -ENOSYS; | |
3001 | } | |
1da177e4 | 3002 | |
d4ffff1f PS |
3003 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3004 | pid = open_file->pid; | |
3005 | else | |
3006 | pid = current->tgid; | |
3007 | ||
1da177e4 | 3008 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 3009 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 3010 | |
f9c6e234 PS |
3011 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3012 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3013 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3014 | /* |
3015 | * For windows me and 9x we do not want to request more than it | |
3016 | * negotiated since it will refuse the read then. | |
3017 | */ | |
3018 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3019 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3020 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3021 | CIFSMaxBufSize); |
f9f5c817 | 3022 | } |
1da177e4 LT |
3023 | rc = -EAGAIN; |
3024 | while (rc == -EAGAIN) { | |
cdff08e7 | 3025 | if (open_file->invalidHandle) { |
15886177 | 3026 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3027 | if (rc != 0) |
3028 | break; | |
3029 | } | |
d4ffff1f | 3030 | io_parms.pid = pid; |
29e20f9c | 3031 | io_parms.tcon = tcon; |
f9c6e234 | 3032 | io_parms.offset = *offset; |
d4ffff1f | 3033 | io_parms.length = current_read_size; |
f9c6e234 PS |
3034 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3035 | &bytes_read, &cur_offset, | |
3036 | &buf_type); | |
1da177e4 LT |
3037 | } |
3038 | if (rc || (bytes_read == 0)) { | |
3039 | if (total_read) { | |
3040 | break; | |
3041 | } else { | |
6d5786a3 | 3042 | free_xid(xid); |
1da177e4 LT |
3043 | return rc; |
3044 | } | |
3045 | } else { | |
29e20f9c | 3046 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3047 | *offset += bytes_read; |
1da177e4 LT |
3048 | } |
3049 | } | |
6d5786a3 | 3050 | free_xid(xid); |
1da177e4 LT |
3051 | return total_read; |
3052 | } | |
3053 | ||
ca83ce3d JL |
3054 | /* |
3055 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3056 | * sure that it doesn't change while being written back. | |
3057 | */ | |
3058 | static int | |
3059 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3060 | { | |
3061 | struct page *page = vmf->page; | |
3062 | ||
3063 | lock_page(page); | |
3064 | return VM_FAULT_LOCKED; | |
3065 | } | |
3066 | ||
3067 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3068 | .fault = filemap_fault, | |
3069 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3070 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3071 | }; |
3072 | ||
7a6a19b1 PS |
3073 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3074 | { | |
3075 | int rc, xid; | |
496ad9aa | 3076 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3077 | |
6d5786a3 | 3078 | xid = get_xid(); |
7a6a19b1 | 3079 | |
6feb9891 PS |
3080 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3081 | rc = cifs_invalidate_mapping(inode); | |
3082 | if (rc) | |
3083 | return rc; | |
3084 | } | |
7a6a19b1 PS |
3085 | |
3086 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3087 | if (rc == 0) |
3088 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3089 | free_xid(xid); |
7a6a19b1 PS |
3090 | return rc; |
3091 | } | |
3092 | ||
1da177e4 LT |
3093 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3094 | { | |
1da177e4 LT |
3095 | int rc, xid; |
3096 | ||
6d5786a3 | 3097 | xid = get_xid(); |
abab095d | 3098 | rc = cifs_revalidate_file(file); |
1da177e4 | 3099 | if (rc) { |
b6b38f70 | 3100 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 3101 | free_xid(xid); |
1da177e4 LT |
3102 | return rc; |
3103 | } | |
3104 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3105 | if (rc == 0) |
3106 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3107 | free_xid(xid); |
1da177e4 LT |
3108 | return rc; |
3109 | } | |
3110 | ||
0471ca3f JL |
3111 | static void |
3112 | cifs_readv_complete(struct work_struct *work) | |
3113 | { | |
c5fab6f4 | 3114 | unsigned int i; |
0471ca3f JL |
3115 | struct cifs_readdata *rdata = container_of(work, |
3116 | struct cifs_readdata, work); | |
0471ca3f | 3117 | |
c5fab6f4 JL |
3118 | for (i = 0; i < rdata->nr_pages; i++) { |
3119 | struct page *page = rdata->pages[i]; | |
3120 | ||
0471ca3f JL |
3121 | lru_cache_add_file(page); |
3122 | ||
3123 | if (rdata->result == 0) { | |
0471ca3f JL |
3124 | flush_dcache_page(page); |
3125 | SetPageUptodate(page); | |
3126 | } | |
3127 | ||
3128 | unlock_page(page); | |
3129 | ||
3130 | if (rdata->result == 0) | |
3131 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3132 | ||
3133 | page_cache_release(page); | |
c5fab6f4 | 3134 | rdata->pages[i] = NULL; |
0471ca3f | 3135 | } |
6993f74a | 3136 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3137 | } |
3138 | ||
8d5ce4d2 | 3139 | static int |
8321fec4 JL |
3140 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3141 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3142 | { |
8321fec4 | 3143 | int total_read = 0, result = 0; |
c5fab6f4 | 3144 | unsigned int i; |
8d5ce4d2 JL |
3145 | u64 eof; |
3146 | pgoff_t eof_index; | |
c5fab6f4 | 3147 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3148 | struct kvec iov; |
8d5ce4d2 JL |
3149 | |
3150 | /* determine the eof that the server (probably) has */ | |
3151 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3152 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
3153 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
3154 | ||
8321fec4 | 3155 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3156 | for (i = 0; i < nr_pages; i++) { |
3157 | struct page *page = rdata->pages[i]; | |
3158 | ||
8321fec4 | 3159 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3160 | /* enough data to fill the page */ |
8321fec4 JL |
3161 | iov.iov_base = kmap(page); |
3162 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 3163 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3164 | i, page->index, iov.iov_base, iov.iov_len); |
3165 | len -= PAGE_CACHE_SIZE; | |
3166 | } else if (len > 0) { | |
8d5ce4d2 | 3167 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3168 | iov.iov_base = kmap(page); |
3169 | iov.iov_len = len; | |
8d5ce4d2 | 3170 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3171 | i, page->index, iov.iov_base, iov.iov_len); |
3172 | memset(iov.iov_base + len, | |
3173 | '\0', PAGE_CACHE_SIZE - len); | |
3174 | rdata->tailsz = len; | |
3175 | len = 0; | |
8d5ce4d2 JL |
3176 | } else if (page->index > eof_index) { |
3177 | /* | |
3178 | * The VFS will not try to do readahead past the | |
3179 | * i_size, but it's possible that we have outstanding | |
3180 | * writes with gaps in the middle and the i_size hasn't | |
3181 | * caught up yet. Populate those with zeroed out pages | |
3182 | * to prevent the VFS from repeatedly attempting to | |
3183 | * fill them until the writes are flushed. | |
3184 | */ | |
3185 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3186 | lru_cache_add_file(page); |
3187 | flush_dcache_page(page); | |
3188 | SetPageUptodate(page); | |
3189 | unlock_page(page); | |
3190 | page_cache_release(page); | |
c5fab6f4 JL |
3191 | rdata->pages[i] = NULL; |
3192 | rdata->nr_pages--; | |
8321fec4 | 3193 | continue; |
8d5ce4d2 JL |
3194 | } else { |
3195 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3196 | lru_cache_add_file(page); |
3197 | unlock_page(page); | |
3198 | page_cache_release(page); | |
c5fab6f4 JL |
3199 | rdata->pages[i] = NULL; |
3200 | rdata->nr_pages--; | |
8321fec4 | 3201 | continue; |
8d5ce4d2 | 3202 | } |
8321fec4 JL |
3203 | |
3204 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3205 | kunmap(page); | |
3206 | if (result < 0) | |
3207 | break; | |
3208 | ||
3209 | total_read += result; | |
8d5ce4d2 JL |
3210 | } |
3211 | ||
8321fec4 | 3212 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3213 | } |
3214 | ||
1da177e4 LT |
3215 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3216 | struct list_head *page_list, unsigned num_pages) | |
3217 | { | |
690c5e31 JL |
3218 | int rc; |
3219 | struct list_head tmplist; | |
3220 | struct cifsFileInfo *open_file = file->private_data; | |
3221 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3222 | unsigned int rsize = cifs_sb->rsize; | |
3223 | pid_t pid; | |
1da177e4 | 3224 | |
690c5e31 JL |
3225 | /* |
3226 | * Give up immediately if rsize is too small to read an entire page. | |
3227 | * The VFS will fall back to readpage. We should never reach this | |
3228 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3229 | * than a cache page. | |
3230 | */ | |
3231 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3232 | return 0; | |
bfa0d75a | 3233 | |
56698236 SJ |
3234 | /* |
3235 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3236 | * immediately if the cookie is negative | |
3237 | */ | |
3238 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3239 | &num_pages); | |
3240 | if (rc == 0) | |
690c5e31 | 3241 | return rc; |
56698236 | 3242 | |
d4ffff1f PS |
3243 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3244 | pid = open_file->pid; | |
3245 | else | |
3246 | pid = current->tgid; | |
3247 | ||
690c5e31 JL |
3248 | rc = 0; |
3249 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3250 | |
690c5e31 JL |
3251 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3252 | mapping, num_pages); | |
3253 | ||
3254 | /* | |
3255 | * Start with the page at end of list and move it to private | |
3256 | * list. Do the same with any following pages until we hit | |
3257 | * the rsize limit, hit an index discontinuity, or run out of | |
3258 | * pages. Issue the async read and then start the loop again | |
3259 | * until the list is empty. | |
3260 | * | |
3261 | * Note that list order is important. The page_list is in | |
3262 | * the order of declining indexes. When we put the pages in | |
3263 | * the rdata->pages, then we want them in increasing order. | |
3264 | */ | |
3265 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3266 | unsigned int i; |
690c5e31 JL |
3267 | unsigned int bytes = PAGE_CACHE_SIZE; |
3268 | unsigned int expected_index; | |
3269 | unsigned int nr_pages = 1; | |
3270 | loff_t offset; | |
3271 | struct page *page, *tpage; | |
3272 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3273 | |
3274 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3275 | |
3276 | /* | |
3277 | * Lock the page and put it in the cache. Since no one else | |
3278 | * should have access to this page, we're safe to simply set | |
3279 | * PG_locked without checking it first. | |
3280 | */ | |
3281 | __set_page_locked(page); | |
3282 | rc = add_to_page_cache_locked(page, mapping, | |
3283 | page->index, GFP_KERNEL); | |
3284 | ||
3285 | /* give up if we can't stick it in the cache */ | |
3286 | if (rc) { | |
3287 | __clear_page_locked(page); | |
3288 | break; | |
3289 | } | |
3290 | ||
3291 | /* move first page to the tmplist */ | |
1da177e4 | 3292 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3293 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3294 | |
690c5e31 JL |
3295 | /* now try and add more pages onto the request */ |
3296 | expected_index = page->index + 1; | |
3297 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3298 | /* discontinuity ? */ | |
3299 | if (page->index != expected_index) | |
fb8c4b14 | 3300 | break; |
690c5e31 JL |
3301 | |
3302 | /* would this page push the read over the rsize? */ | |
3303 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3304 | break; | |
3305 | ||
3306 | __set_page_locked(page); | |
3307 | if (add_to_page_cache_locked(page, mapping, | |
3308 | page->index, GFP_KERNEL)) { | |
3309 | __clear_page_locked(page); | |
3310 | break; | |
3311 | } | |
3312 | list_move_tail(&page->lru, &tmplist); | |
3313 | bytes += PAGE_CACHE_SIZE; | |
3314 | expected_index++; | |
3315 | nr_pages++; | |
1da177e4 | 3316 | } |
690c5e31 | 3317 | |
0471ca3f | 3318 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3319 | if (!rdata) { |
3320 | /* best to give up if we're out of mem */ | |
3321 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3322 | list_del(&page->lru); | |
3323 | lru_cache_add_file(page); | |
3324 | unlock_page(page); | |
3325 | page_cache_release(page); | |
3326 | } | |
3327 | rc = -ENOMEM; | |
3328 | break; | |
3329 | } | |
3330 | ||
6993f74a | 3331 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3332 | rdata->mapping = mapping; |
3333 | rdata->offset = offset; | |
3334 | rdata->bytes = bytes; | |
3335 | rdata->pid = pid; | |
8321fec4 JL |
3336 | rdata->pagesz = PAGE_CACHE_SIZE; |
3337 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3338 | |
3339 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3340 | list_del(&page->lru); | |
3341 | rdata->pages[rdata->nr_pages++] = page; | |
3342 | } | |
690c5e31 | 3343 | |
2a1bb138 | 3344 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3345 | if (rc != 0) { |
c5fab6f4 JL |
3346 | for (i = 0; i < rdata->nr_pages; i++) { |
3347 | page = rdata->pages[i]; | |
690c5e31 JL |
3348 | lru_cache_add_file(page); |
3349 | unlock_page(page); | |
3350 | page_cache_release(page); | |
1da177e4 | 3351 | } |
6993f74a | 3352 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3353 | break; |
3354 | } | |
6993f74a JL |
3355 | |
3356 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3357 | } |
3358 | ||
1da177e4 LT |
3359 | return rc; |
3360 | } | |
3361 | ||
3362 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3363 | loff_t *poffset) | |
3364 | { | |
3365 | char *read_data; | |
3366 | int rc; | |
3367 | ||
56698236 | 3368 | /* Is the page cached? */ |
496ad9aa | 3369 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3370 | if (rc == 0) |
3371 | goto read_complete; | |
3372 | ||
1da177e4 LT |
3373 | page_cache_get(page); |
3374 | read_data = kmap(page); | |
3375 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3376 | |
1da177e4 | 3377 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3378 | |
1da177e4 LT |
3379 | if (rc < 0) |
3380 | goto io_error; | |
3381 | else | |
b6b38f70 | 3382 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3383 | |
496ad9aa AV |
3384 | file_inode(file)->i_atime = |
3385 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3386 | |
1da177e4 LT |
3387 | if (PAGE_CACHE_SIZE > rc) |
3388 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3389 | ||
3390 | flush_dcache_page(page); | |
3391 | SetPageUptodate(page); | |
9dc06558 SJ |
3392 | |
3393 | /* send this page to the cache */ | |
496ad9aa | 3394 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3395 | |
1da177e4 | 3396 | rc = 0; |
fb8c4b14 | 3397 | |
1da177e4 | 3398 | io_error: |
fb8c4b14 | 3399 | kunmap(page); |
1da177e4 | 3400 | page_cache_release(page); |
56698236 SJ |
3401 | |
3402 | read_complete: | |
1da177e4 LT |
3403 | return rc; |
3404 | } | |
3405 | ||
3406 | static int cifs_readpage(struct file *file, struct page *page) | |
3407 | { | |
3408 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3409 | int rc = -EACCES; | |
6d5786a3 | 3410 | unsigned int xid; |
1da177e4 | 3411 | |
6d5786a3 | 3412 | xid = get_xid(); |
1da177e4 LT |
3413 | |
3414 | if (file->private_data == NULL) { | |
0f3bc09e | 3415 | rc = -EBADF; |
6d5786a3 | 3416 | free_xid(xid); |
0f3bc09e | 3417 | return rc; |
1da177e4 LT |
3418 | } |
3419 | ||
ac3aa2f8 | 3420 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3421 | page, (int)offset, (int)offset); |
1da177e4 LT |
3422 | |
3423 | rc = cifs_readpage_worker(file, page, &offset); | |
3424 | ||
3425 | unlock_page(page); | |
3426 | ||
6d5786a3 | 3427 | free_xid(xid); |
1da177e4 LT |
3428 | return rc; |
3429 | } | |
3430 | ||
a403a0a3 SF |
3431 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3432 | { | |
3433 | struct cifsFileInfo *open_file; | |
3434 | ||
4477288a | 3435 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3436 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3437 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3438 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3439 | return 1; |
3440 | } | |
3441 | } | |
4477288a | 3442 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3443 | return 0; |
3444 | } | |
3445 | ||
1da177e4 LT |
3446 | /* We do not want to update the file size from server for inodes |
3447 | open for write - to avoid races with writepage extending | |
3448 | the file - in the future we could consider allowing | |
fb8c4b14 | 3449 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3450 | but this is tricky to do without racing with writebehind |
3451 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3452 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3453 | { |
a403a0a3 | 3454 | if (!cifsInode) |
4b18f2a9 | 3455 | return true; |
50c2f753 | 3456 | |
a403a0a3 SF |
3457 | if (is_inode_writable(cifsInode)) { |
3458 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3459 | struct cifs_sb_info *cifs_sb; |
3460 | ||
c32a0b68 | 3461 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3462 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3463 | /* since no page cache to corrupt on directio |
c32a0b68 | 3464 | we can change size safely */ |
4b18f2a9 | 3465 | return true; |
c32a0b68 SF |
3466 | } |
3467 | ||
fb8c4b14 | 3468 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3469 | return true; |
7ba52631 | 3470 | |
4b18f2a9 | 3471 | return false; |
23e7dd7d | 3472 | } else |
4b18f2a9 | 3473 | return true; |
1da177e4 LT |
3474 | } |
3475 | ||
d9414774 NP |
3476 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3477 | loff_t pos, unsigned len, unsigned flags, | |
3478 | struct page **pagep, void **fsdata) | |
1da177e4 | 3479 | { |
d9414774 NP |
3480 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3481 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3482 | loff_t page_start = pos & PAGE_MASK; |
3483 | loff_t i_size; | |
3484 | struct page *page; | |
3485 | int rc = 0; | |
d9414774 | 3486 | |
b6b38f70 | 3487 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3488 | |
54566b2c | 3489 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3490 | if (!page) { |
3491 | rc = -ENOMEM; | |
3492 | goto out; | |
3493 | } | |
8a236264 | 3494 | |
a98ee8c1 JL |
3495 | if (PageUptodate(page)) |
3496 | goto out; | |
8a236264 | 3497 | |
a98ee8c1 JL |
3498 | /* |
3499 | * If we write a full page it will be up to date, no need to read from | |
3500 | * the server. If the write is short, we'll end up doing a sync write | |
3501 | * instead. | |
3502 | */ | |
3503 | if (len == PAGE_CACHE_SIZE) | |
3504 | goto out; | |
8a236264 | 3505 | |
a98ee8c1 JL |
3506 | /* |
3507 | * optimize away the read when we have an oplock, and we're not | |
3508 | * expecting to use any of the data we'd be reading in. That | |
3509 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3510 | * and the write will cover all of the existing data. | |
3511 | */ | |
3512 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3513 | i_size = i_size_read(mapping->host); | |
3514 | if (page_start >= i_size || | |
3515 | (offset == 0 && (pos + len) >= i_size)) { | |
3516 | zero_user_segments(page, 0, offset, | |
3517 | offset + len, | |
3518 | PAGE_CACHE_SIZE); | |
3519 | /* | |
3520 | * PageChecked means that the parts of the page | |
3521 | * to which we're not writing are considered up | |
3522 | * to date. Once the data is copied to the | |
3523 | * page, it can be set uptodate. | |
3524 | */ | |
3525 | SetPageChecked(page); | |
3526 | goto out; | |
3527 | } | |
3528 | } | |
d9414774 | 3529 | |
a98ee8c1 JL |
3530 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3531 | /* | |
3532 | * might as well read a page, it is fast enough. If we get | |
3533 | * an error, we don't need to return it. cifs_write_end will | |
3534 | * do a sync write instead since PG_uptodate isn't set. | |
3535 | */ | |
3536 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3537 | } else { |
3538 | /* we could try using another file handle if there is one - | |
3539 | but how would we lock it to prevent close of that handle | |
3540 | racing with this read? In any case | |
d9414774 | 3541 | this will be written out by write_end so is fine */ |
1da177e4 | 3542 | } |
a98ee8c1 JL |
3543 | out: |
3544 | *pagep = page; | |
3545 | return rc; | |
1da177e4 LT |
3546 | } |
3547 | ||
85f2d6b4 SJ |
3548 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3549 | { | |
3550 | if (PagePrivate(page)) | |
3551 | return 0; | |
3552 | ||
3553 | return cifs_fscache_release_page(page, gfp); | |
3554 | } | |
3555 | ||
3556 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3557 | { | |
3558 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3559 | ||
3560 | if (offset == 0) | |
3561 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3562 | } | |
3563 | ||
9ad1506b PS |
3564 | static int cifs_launder_page(struct page *page) |
3565 | { | |
3566 | int rc = 0; | |
3567 | loff_t range_start = page_offset(page); | |
3568 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3569 | struct writeback_control wbc = { | |
3570 | .sync_mode = WB_SYNC_ALL, | |
3571 | .nr_to_write = 0, | |
3572 | .range_start = range_start, | |
3573 | .range_end = range_end, | |
3574 | }; | |
3575 | ||
3576 | cFYI(1, "Launder page: %p", page); | |
3577 | ||
3578 | if (clear_page_dirty_for_io(page)) | |
3579 | rc = cifs_writepage_locked(page, &wbc); | |
3580 | ||
3581 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3582 | return rc; | |
3583 | } | |
3584 | ||
9b646972 | 3585 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3586 | { |
3587 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3588 | oplock_break); | |
a5e18bc3 | 3589 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3590 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3591 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3592 | int rc = 0; |
3bc303c2 | 3593 | |
63b7d3a4 PS |
3594 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead && |
3595 | cifs_has_mand_locks(cinode)) { | |
3596 | cFYI(1, "Reset oplock to None for inode=%p due to mand locks", | |
3597 | inode); | |
3598 | cinode->clientCanCacheRead = false; | |
3599 | } | |
3600 | ||
3bc303c2 | 3601 | if (inode && S_ISREG(inode->i_mode)) { |
d54ff732 | 3602 | if (cinode->clientCanCacheRead) |
8737c930 | 3603 | break_lease(inode, O_RDONLY); |
d54ff732 | 3604 | else |
8737c930 | 3605 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3606 | rc = filemap_fdatawrite(inode->i_mapping); |
3607 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3608 | rc = filemap_fdatawait(inode->i_mapping); |
3609 | mapping_set_error(inode->i_mapping, rc); | |
03eca704 | 3610 | cifs_invalidate_mapping(inode); |
3bc303c2 | 3611 | } |
b6b38f70 | 3612 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3613 | } |
3614 | ||
85160e03 PS |
3615 | rc = cifs_push_locks(cfile); |
3616 | if (rc) | |
3617 | cERROR(1, "Push locks rc = %d", rc); | |
3618 | ||
3bc303c2 JL |
3619 | /* |
3620 | * releasing stale oplock after recent reconnect of smb session using | |
3621 | * a now incorrect file handle is not a data integrity issue but do | |
3622 | * not bother sending an oplock release if session to server still is | |
3623 | * disconnected since oplock already released by the server | |
3624 | */ | |
cdff08e7 | 3625 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3626 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3627 | cinode); | |
b6b38f70 | 3628 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3629 | } |
3bc303c2 JL |
3630 | } |
3631 | ||
f5e54d6e | 3632 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3633 | .readpage = cifs_readpage, |
3634 | .readpages = cifs_readpages, | |
3635 | .writepage = cifs_writepage, | |
37c0eb46 | 3636 | .writepages = cifs_writepages, |
d9414774 NP |
3637 | .write_begin = cifs_write_begin, |
3638 | .write_end = cifs_write_end, | |
1da177e4 | 3639 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3640 | .releasepage = cifs_release_page, |
3641 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3642 | .launder_page = cifs_launder_page, |
1da177e4 | 3643 | }; |
273d81d6 DK |
3644 | |
3645 | /* | |
3646 | * cifs_readpages requires the server to support a buffer large enough to | |
3647 | * contain the header plus one complete page of data. Otherwise, we need | |
3648 | * to leave cifs_readpages out of the address space operations. | |
3649 | */ | |
f5e54d6e | 3650 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3651 | .readpage = cifs_readpage, |
3652 | .writepage = cifs_writepage, | |
3653 | .writepages = cifs_writepages, | |
d9414774 NP |
3654 | .write_begin = cifs_write_begin, |
3655 | .write_end = cifs_write_end, | |
273d81d6 | 3656 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3657 | .releasepage = cifs_release_page, |
3658 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3659 | .launder_page = cifs_launder_page, |
273d81d6 | 3660 | }; |