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