Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
07b92d0d | 46 | |
1da177e4 LT |
47 | static inline int cifs_convert_flags(unsigned int flags) |
48 | { | |
49 | if ((flags & O_ACCMODE) == O_RDONLY) | |
50 | return GENERIC_READ; | |
51 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
52 | return GENERIC_WRITE; | |
53 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
54 | /* GENERIC_ALL is too much permission to request | |
55 | can cause unnecessary access denied on create */ | |
56 | /* return GENERIC_ALL; */ | |
57 | return (GENERIC_READ | GENERIC_WRITE); | |
58 | } | |
59 | ||
e10f7b55 JL |
60 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
61 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
62 | FILE_READ_DATA); | |
7fc8f4e9 | 63 | } |
e10f7b55 | 64 | |
608712fe | 65 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 66 | { |
608712fe | 67 | u32 posix_flags = 0; |
e10f7b55 | 68 | |
7fc8f4e9 | 69 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 70 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 71 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
72 | posix_flags = SMB_O_WRONLY; |
73 | else if ((flags & O_ACCMODE) == O_RDWR) | |
74 | posix_flags = SMB_O_RDWR; | |
75 | ||
07b92d0d | 76 | if (flags & O_CREAT) { |
608712fe | 77 | posix_flags |= SMB_O_CREAT; |
07b92d0d SF |
78 | if (flags & O_EXCL) |
79 | posix_flags |= SMB_O_EXCL; | |
80 | } else if (flags & O_EXCL) | |
f96637be JP |
81 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
82 | current->comm, current->tgid); | |
07b92d0d | 83 | |
608712fe JL |
84 | if (flags & O_TRUNC) |
85 | posix_flags |= SMB_O_TRUNC; | |
86 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 87 | if (flags & O_DSYNC) |
608712fe | 88 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 89 | if (flags & O_DIRECTORY) |
608712fe | 90 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 91 | if (flags & O_NOFOLLOW) |
608712fe | 92 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 93 | if (flags & O_DIRECT) |
608712fe | 94 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
95 | |
96 | return posix_flags; | |
1da177e4 LT |
97 | } |
98 | ||
99 | static inline int cifs_get_disposition(unsigned int flags) | |
100 | { | |
101 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
102 | return FILE_CREATE; | |
103 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
104 | return FILE_OVERWRITE_IF; | |
105 | else if ((flags & O_CREAT) == O_CREAT) | |
106 | return FILE_OPEN_IF; | |
55aa2e09 SF |
107 | else if ((flags & O_TRUNC) == O_TRUNC) |
108 | return FILE_OVERWRITE; | |
1da177e4 LT |
109 | else |
110 | return FILE_OPEN; | |
111 | } | |
112 | ||
608712fe JL |
113 | int cifs_posix_open(char *full_path, struct inode **pinode, |
114 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 115 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
116 | { |
117 | int rc; | |
118 | FILE_UNIX_BASIC_INFO *presp_data; | |
119 | __u32 posix_flags = 0; | |
120 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
121 | struct cifs_fattr fattr; | |
122 | struct tcon_link *tlink; | |
96daf2b0 | 123 | struct cifs_tcon *tcon; |
608712fe | 124 | |
f96637be | 125 | cifs_dbg(FYI, "posix open %s\n", full_path); |
608712fe JL |
126 | |
127 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
128 | if (presp_data == NULL) | |
129 | return -ENOMEM; | |
130 | ||
131 | tlink = cifs_sb_tlink(cifs_sb); | |
132 | if (IS_ERR(tlink)) { | |
133 | rc = PTR_ERR(tlink); | |
134 | goto posix_open_ret; | |
135 | } | |
136 | ||
137 | tcon = tlink_tcon(tlink); | |
138 | mode &= ~current_umask(); | |
139 | ||
140 | posix_flags = cifs_posix_convert_flags(f_flags); | |
141 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
142 | poplock, full_path, cifs_sb->local_nls, | |
143 | cifs_sb->mnt_cifs_flags & | |
144 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
145 | cifs_put_tlink(tlink); | |
146 | ||
147 | if (rc) | |
148 | goto posix_open_ret; | |
149 | ||
150 | if (presp_data->Type == cpu_to_le32(-1)) | |
151 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
152 | ||
153 | if (!pinode) | |
154 | goto posix_open_ret; /* caller does not need info */ | |
155 | ||
156 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
157 | ||
158 | /* get new inode and set it up */ | |
159 | if (*pinode == NULL) { | |
160 | cifs_fill_uniqueid(sb, &fattr); | |
161 | *pinode = cifs_iget(sb, &fattr); | |
162 | if (!*pinode) { | |
163 | rc = -ENOMEM; | |
164 | goto posix_open_ret; | |
165 | } | |
166 | } else { | |
167 | cifs_fattr_to_inode(*pinode, &fattr); | |
168 | } | |
169 | ||
170 | posix_open_ret: | |
171 | kfree(presp_data); | |
172 | return rc; | |
173 | } | |
174 | ||
eeb910a6 PS |
175 | static int |
176 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
177 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
178 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
179 | { |
180 | int rc; | |
fb1214e4 | 181 | int desired_access; |
eeb910a6 | 182 | int disposition; |
3d3ea8e6 | 183 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 184 | FILE_ALL_INFO *buf; |
b8c32dbb | 185 | struct TCP_Server_Info *server = tcon->ses->server; |
eeb910a6 | 186 | |
b8c32dbb | 187 | if (!server->ops->open) |
fb1214e4 PS |
188 | return -ENOSYS; |
189 | ||
190 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
191 | |
192 | /********************************************************************* | |
193 | * open flag mapping table: | |
194 | * | |
195 | * POSIX Flag CIFS Disposition | |
196 | * ---------- ---------------- | |
197 | * O_CREAT FILE_OPEN_IF | |
198 | * O_CREAT | O_EXCL FILE_CREATE | |
199 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
200 | * O_TRUNC FILE_OVERWRITE | |
201 | * none of the above FILE_OPEN | |
202 | * | |
203 | * Note that there is not a direct match between disposition | |
204 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
205 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
206 | * file rather than creating a new file as FILE_SUPERSEDE does | |
207 | * (which uses the attributes / metadata passed in on open call) | |
208 | *? | |
209 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
210 | *? and the read write flags match reasonably. O_LARGEFILE | |
211 | *? is irrelevant because largefile support is always used | |
212 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
213 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
214 | *********************************************************************/ | |
215 | ||
216 | disposition = cifs_get_disposition(f_flags); | |
217 | ||
218 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
219 | ||
220 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
221 | if (!buf) | |
222 | return -ENOMEM; | |
223 | ||
3d3ea8e6 SP |
224 | if (backup_cred(cifs_sb)) |
225 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
226 | ||
b8c32dbb PS |
227 | rc = server->ops->open(xid, tcon, full_path, disposition, |
228 | desired_access, create_options, fid, oplock, buf, | |
229 | cifs_sb); | |
eeb910a6 PS |
230 | |
231 | if (rc) | |
232 | goto out; | |
233 | ||
234 | if (tcon->unix_ext) | |
235 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
236 | xid); | |
237 | else | |
238 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 239 | xid, &fid->netfid); |
eeb910a6 PS |
240 | |
241 | out: | |
242 | kfree(buf); | |
243 | return rc; | |
244 | } | |
245 | ||
63b7d3a4 PS |
246 | static bool |
247 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
248 | { | |
249 | struct cifs_fid_locks *cur; | |
250 | bool has_locks = false; | |
251 | ||
252 | down_read(&cinode->lock_sem); | |
253 | list_for_each_entry(cur, &cinode->llist, llist) { | |
254 | if (!list_empty(&cur->locks)) { | |
255 | has_locks = true; | |
256 | break; | |
257 | } | |
258 | } | |
259 | up_read(&cinode->lock_sem); | |
260 | return has_locks; | |
261 | } | |
262 | ||
15ecb436 | 263 | struct cifsFileInfo * |
fb1214e4 | 264 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
265 | struct tcon_link *tlink, __u32 oplock) |
266 | { | |
267 | struct dentry *dentry = file->f_path.dentry; | |
268 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
269 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
270 | struct cifsFileInfo *cfile; | |
f45d3416 | 271 | struct cifs_fid_locks *fdlocks; |
233839b1 | 272 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 273 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
274 | |
275 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
276 | if (cfile == NULL) | |
277 | return cfile; | |
278 | ||
f45d3416 PS |
279 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
280 | if (!fdlocks) { | |
281 | kfree(cfile); | |
282 | return NULL; | |
283 | } | |
284 | ||
285 | INIT_LIST_HEAD(&fdlocks->locks); | |
286 | fdlocks->cfile = cfile; | |
287 | cfile->llist = fdlocks; | |
1b4b55a1 | 288 | down_write(&cinode->lock_sem); |
f45d3416 | 289 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 290 | up_write(&cinode->lock_sem); |
f45d3416 | 291 | |
4b4de76e | 292 | cfile->count = 1; |
4b4de76e PS |
293 | cfile->pid = current->tgid; |
294 | cfile->uid = current_fsuid(); | |
295 | cfile->dentry = dget(dentry); | |
296 | cfile->f_flags = file->f_flags; | |
297 | cfile->invalidHandle = false; | |
298 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 299 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 300 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 301 | |
24261fc2 MG |
302 | cifs_sb_active(inode->i_sb); |
303 | ||
63b7d3a4 PS |
304 | /* |
305 | * If the server returned a read oplock and we have mandatory brlocks, | |
306 | * set oplock level to None. | |
307 | */ | |
308 | if (oplock == server->vals->oplock_read && | |
309 | cifs_has_mand_locks(cinode)) { | |
f96637be | 310 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
311 | oplock = 0; |
312 | } | |
313 | ||
4477288a | 314 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 315 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
316 | oplock = fid->pending_open->oplock; |
317 | list_del(&fid->pending_open->olist); | |
318 | ||
63b7d3a4 | 319 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
320 | |
321 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
322 | /* if readable file instance put first in list*/ |
323 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 324 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 325 | else |
4b4de76e | 326 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 327 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 328 | |
4b4de76e PS |
329 | file->private_data = cfile; |
330 | return cfile; | |
15ecb436 JL |
331 | } |
332 | ||
764a1b1a JL |
333 | struct cifsFileInfo * |
334 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
335 | { | |
336 | spin_lock(&cifs_file_list_lock); | |
337 | cifsFileInfo_get_locked(cifs_file); | |
338 | spin_unlock(&cifs_file_list_lock); | |
339 | return cifs_file; | |
340 | } | |
341 | ||
cdff08e7 SF |
342 | /* |
343 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
344 | * the filehandle out on the server. Must be called without holding |
345 | * cifs_file_list_lock. | |
cdff08e7 | 346 | */ |
b33879aa JL |
347 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
348 | { | |
e66673e3 | 349 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 350 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 351 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 352 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
353 | struct super_block *sb = inode->i_sb; |
354 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 355 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
356 | struct cifs_fid fid; |
357 | struct cifs_pending_open open; | |
cdff08e7 SF |
358 | |
359 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 360 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
361 | spin_unlock(&cifs_file_list_lock); |
362 | return; | |
363 | } | |
364 | ||
233839b1 PS |
365 | if (server->ops->get_lease_key) |
366 | server->ops->get_lease_key(inode, &fid); | |
367 | ||
368 | /* store open in pending opens to make sure we don't miss lease break */ | |
369 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
370 | ||
cdff08e7 SF |
371 | /* remove it from the lists */ |
372 | list_del(&cifs_file->flist); | |
373 | list_del(&cifs_file->tlist); | |
374 | ||
375 | if (list_empty(&cifsi->openFileList)) { | |
f96637be JP |
376 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
377 | cifs_file->dentry->d_inode); | |
25364138 PS |
378 | /* |
379 | * In strict cache mode we need invalidate mapping on the last | |
380 | * close because it may cause a error when we open this file | |
381 | * again and get at least level II oplock. | |
382 | */ | |
4f8ba8a0 PS |
383 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
384 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 385 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
386 | } |
387 | spin_unlock(&cifs_file_list_lock); | |
388 | ||
ad635942 JL |
389 | cancel_work_sync(&cifs_file->oplock_break); |
390 | ||
cdff08e7 | 391 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 392 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 393 | unsigned int xid; |
0ff78a22 | 394 | |
6d5786a3 | 395 | xid = get_xid(); |
0ff78a22 | 396 | if (server->ops->close) |
760ad0ca PS |
397 | server->ops->close(xid, tcon, &cifs_file->fid); |
398 | _free_xid(xid); | |
cdff08e7 SF |
399 | } |
400 | ||
233839b1 PS |
401 | cifs_del_pending_open(&open); |
402 | ||
f45d3416 PS |
403 | /* |
404 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
405 | * is closed anyway. |
406 | */ | |
1b4b55a1 | 407 | down_write(&cifsi->lock_sem); |
f45d3416 | 408 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 409 | list_del(&li->llist); |
85160e03 | 410 | cifs_del_lock_waiters(li); |
cdff08e7 | 411 | kfree(li); |
b33879aa | 412 | } |
f45d3416 PS |
413 | list_del(&cifs_file->llist->llist); |
414 | kfree(cifs_file->llist); | |
1b4b55a1 | 415 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
416 | |
417 | cifs_put_tlink(cifs_file->tlink); | |
418 | dput(cifs_file->dentry); | |
24261fc2 | 419 | cifs_sb_deactive(sb); |
cdff08e7 | 420 | kfree(cifs_file); |
b33879aa JL |
421 | } |
422 | ||
1da177e4 | 423 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 424 | |
1da177e4 LT |
425 | { |
426 | int rc = -EACCES; | |
6d5786a3 | 427 | unsigned int xid; |
590a3fe0 | 428 | __u32 oplock; |
1da177e4 | 429 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 430 | struct TCP_Server_Info *server; |
96daf2b0 | 431 | struct cifs_tcon *tcon; |
7ffec372 | 432 | struct tcon_link *tlink; |
fb1214e4 | 433 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 434 | char *full_path = NULL; |
7e12eddb | 435 | bool posix_open_ok = false; |
fb1214e4 | 436 | struct cifs_fid fid; |
233839b1 | 437 | struct cifs_pending_open open; |
1da177e4 | 438 | |
6d5786a3 | 439 | xid = get_xid(); |
1da177e4 LT |
440 | |
441 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
442 | tlink = cifs_sb_tlink(cifs_sb); |
443 | if (IS_ERR(tlink)) { | |
6d5786a3 | 444 | free_xid(xid); |
7ffec372 JL |
445 | return PTR_ERR(tlink); |
446 | } | |
447 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 448 | server = tcon->ses->server; |
1da177e4 | 449 | |
e6a00296 | 450 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 451 | if (full_path == NULL) { |
0f3bc09e | 452 | rc = -ENOMEM; |
232341ba | 453 | goto out; |
1da177e4 LT |
454 | } |
455 | ||
f96637be | 456 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 457 | inode, file->f_flags, full_path); |
276a74a4 | 458 | |
233839b1 | 459 | if (server->oplocks) |
276a74a4 SF |
460 | oplock = REQ_OPLOCK; |
461 | else | |
462 | oplock = 0; | |
463 | ||
64cc2c63 | 464 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
465 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
466 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 467 | /* can not refresh inode info since size could be stale */ |
2422f676 | 468 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 469 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 470 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 471 | if (rc == 0) { |
f96637be | 472 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 473 | posix_open_ok = true; |
64cc2c63 SF |
474 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
475 | if (tcon->ses->serverNOS) | |
f96637be JP |
476 | cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
477 | tcon->ses->serverName, | |
478 | tcon->ses->serverNOS); | |
64cc2c63 | 479 | tcon->broken_posix_open = true; |
276a74a4 SF |
480 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
481 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
482 | goto out; | |
fb1214e4 PS |
483 | /* |
484 | * Else fallthrough to retry open the old way on network i/o | |
485 | * or DFS errors. | |
486 | */ | |
276a74a4 SF |
487 | } |
488 | ||
233839b1 PS |
489 | if (server->ops->get_lease_key) |
490 | server->ops->get_lease_key(inode, &fid); | |
491 | ||
492 | cifs_add_pending_open(&fid, tlink, &open); | |
493 | ||
7e12eddb | 494 | if (!posix_open_ok) { |
b8c32dbb PS |
495 | if (server->ops->get_lease_key) |
496 | server->ops->get_lease_key(inode, &fid); | |
497 | ||
7e12eddb | 498 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 499 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
500 | if (rc) { |
501 | cifs_del_pending_open(&open); | |
7e12eddb | 502 | goto out; |
233839b1 | 503 | } |
7e12eddb | 504 | } |
47c78b7f | 505 | |
fb1214e4 PS |
506 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
507 | if (cfile == NULL) { | |
b8c32dbb PS |
508 | if (server->ops->close) |
509 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 510 | cifs_del_pending_open(&open); |
1da177e4 LT |
511 | rc = -ENOMEM; |
512 | goto out; | |
513 | } | |
1da177e4 | 514 | |
9451a9a5 SJ |
515 | cifs_fscache_set_inode_cookie(inode, file); |
516 | ||
7e12eddb | 517 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
518 | /* |
519 | * Time to set mode which we can not set earlier due to | |
520 | * problems creating new read-only files. | |
521 | */ | |
7e12eddb PS |
522 | struct cifs_unix_set_info_args args = { |
523 | .mode = inode->i_mode, | |
49418b2c EB |
524 | .uid = INVALID_UID, /* no change */ |
525 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
526 | .ctime = NO_CHANGE_64, |
527 | .atime = NO_CHANGE_64, | |
528 | .mtime = NO_CHANGE_64, | |
529 | .device = 0, | |
530 | }; | |
fb1214e4 PS |
531 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
532 | cfile->pid); | |
1da177e4 LT |
533 | } |
534 | ||
535 | out: | |
1da177e4 | 536 | kfree(full_path); |
6d5786a3 | 537 | free_xid(xid); |
7ffec372 | 538 | cifs_put_tlink(tlink); |
1da177e4 LT |
539 | return rc; |
540 | } | |
541 | ||
f152fd5f PS |
542 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
543 | ||
2ae78ba8 PS |
544 | /* |
545 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 546 | * to server was lost. |
2ae78ba8 | 547 | */ |
f152fd5f PS |
548 | static int |
549 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 550 | { |
f152fd5f PS |
551 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
552 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
553 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
554 | int rc = 0; |
555 | ||
059a1671 | 556 | down_read(&cinode->lock_sem); |
f152fd5f | 557 | if (cinode->can_cache_brlcks) { |
059a1671 PS |
558 | /* can cache locks - no need to relock */ |
559 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
560 | return rc; |
561 | } | |
562 | ||
563 | if (cap_unix(tcon->ses) && | |
564 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
565 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
566 | rc = cifs_push_posix_locks(cfile); | |
567 | else | |
568 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 569 | |
059a1671 | 570 | up_read(&cinode->lock_sem); |
1da177e4 LT |
571 | return rc; |
572 | } | |
573 | ||
2ae78ba8 PS |
574 | static int |
575 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
576 | { |
577 | int rc = -EACCES; | |
6d5786a3 | 578 | unsigned int xid; |
590a3fe0 | 579 | __u32 oplock; |
1da177e4 | 580 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 581 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
582 | struct TCP_Server_Info *server; |
583 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 584 | struct inode *inode; |
1da177e4 | 585 | char *full_path = NULL; |
2ae78ba8 | 586 | int desired_access; |
1da177e4 | 587 | int disposition = FILE_OPEN; |
3d3ea8e6 | 588 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 589 | struct cifs_fid fid; |
1da177e4 | 590 | |
6d5786a3 | 591 | xid = get_xid(); |
2ae78ba8 PS |
592 | mutex_lock(&cfile->fh_mutex); |
593 | if (!cfile->invalidHandle) { | |
594 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 595 | rc = 0; |
6d5786a3 | 596 | free_xid(xid); |
0f3bc09e | 597 | return rc; |
1da177e4 LT |
598 | } |
599 | ||
2ae78ba8 | 600 | inode = cfile->dentry->d_inode; |
1da177e4 | 601 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
602 | tcon = tlink_tcon(cfile->tlink); |
603 | server = tcon->ses->server; | |
604 | ||
605 | /* | |
606 | * Can not grab rename sem here because various ops, including those | |
607 | * that already have the rename sem can end up causing writepage to get | |
608 | * called and if the server was down that means we end up here, and we | |
609 | * can never tell if the caller already has the rename_sem. | |
610 | */ | |
611 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 612 | if (full_path == NULL) { |
3a9f462f | 613 | rc = -ENOMEM; |
2ae78ba8 | 614 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 615 | free_xid(xid); |
3a9f462f | 616 | return rc; |
1da177e4 LT |
617 | } |
618 | ||
f96637be JP |
619 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
620 | inode, cfile->f_flags, full_path); | |
1da177e4 | 621 | |
10b9b98e | 622 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
623 | oplock = REQ_OPLOCK; |
624 | else | |
4b18f2a9 | 625 | oplock = 0; |
1da177e4 | 626 | |
29e20f9c | 627 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 628 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 629 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
630 | /* |
631 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
632 | * original open. Must mask them off for a reopen. | |
633 | */ | |
2ae78ba8 | 634 | unsigned int oflags = cfile->f_flags & |
15886177 | 635 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 636 | |
2422f676 | 637 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
638 | cifs_sb->mnt_file_mode /* ignored */, |
639 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 640 | if (rc == 0) { |
f96637be | 641 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
7fc8f4e9 SF |
642 | goto reopen_success; |
643 | } | |
2ae78ba8 PS |
644 | /* |
645 | * fallthrough to retry open the old way on errors, especially | |
646 | * in the reconnect path it is important to retry hard | |
647 | */ | |
7fc8f4e9 SF |
648 | } |
649 | ||
2ae78ba8 | 650 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 651 | |
3d3ea8e6 SP |
652 | if (backup_cred(cifs_sb)) |
653 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
654 | ||
b8c32dbb PS |
655 | if (server->ops->get_lease_key) |
656 | server->ops->get_lease_key(inode, &fid); | |
657 | ||
2ae78ba8 PS |
658 | /* |
659 | * Can not refresh inode by passing in file_info buf to be returned by | |
660 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
661 | * file might have write behind data that needs to be flushed and server | |
662 | * version of file size can be stale. If we knew for sure that inode was | |
663 | * not dirty locally we could do this. | |
664 | */ | |
665 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
666 | desired_access, create_options, &fid, &oplock, | |
667 | NULL, cifs_sb); | |
1da177e4 | 668 | if (rc) { |
2ae78ba8 | 669 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
670 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
671 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
672 | goto reopen_error_exit; |
673 | } | |
674 | ||
7fc8f4e9 | 675 | reopen_success: |
2ae78ba8 PS |
676 | cfile->invalidHandle = false; |
677 | mutex_unlock(&cfile->fh_mutex); | |
678 | cinode = CIFS_I(inode); | |
15886177 JL |
679 | |
680 | if (can_flush) { | |
681 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 682 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 683 | |
15886177 | 684 | if (tcon->unix_ext) |
2ae78ba8 PS |
685 | rc = cifs_get_inode_info_unix(&inode, full_path, |
686 | inode->i_sb, xid); | |
15886177 | 687 | else |
2ae78ba8 PS |
688 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
689 | inode->i_sb, xid, NULL); | |
690 | } | |
691 | /* | |
692 | * Else we are writing out data to server already and could deadlock if | |
693 | * we tried to flush data, and since we do not know if we have data that | |
694 | * would invalidate the current end of file on the server we can not go | |
695 | * to the server to get the new inode info. | |
696 | */ | |
697 | ||
698 | server->ops->set_fid(cfile, &fid, oplock); | |
699 | cifs_relock_file(cfile); | |
15886177 JL |
700 | |
701 | reopen_error_exit: | |
1da177e4 | 702 | kfree(full_path); |
6d5786a3 | 703 | free_xid(xid); |
1da177e4 LT |
704 | return rc; |
705 | } | |
706 | ||
707 | int cifs_close(struct inode *inode, struct file *file) | |
708 | { | |
77970693 JL |
709 | if (file->private_data != NULL) { |
710 | cifsFileInfo_put(file->private_data); | |
711 | file->private_data = NULL; | |
712 | } | |
7ee1af76 | 713 | |
cdff08e7 SF |
714 | /* return code from the ->release op is always ignored */ |
715 | return 0; | |
1da177e4 LT |
716 | } |
717 | ||
718 | int cifs_closedir(struct inode *inode, struct file *file) | |
719 | { | |
720 | int rc = 0; | |
6d5786a3 | 721 | unsigned int xid; |
4b4de76e | 722 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
723 | struct cifs_tcon *tcon; |
724 | struct TCP_Server_Info *server; | |
725 | char *buf; | |
1da177e4 | 726 | |
f96637be | 727 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 728 | |
92fc65a7 PS |
729 | if (cfile == NULL) |
730 | return rc; | |
731 | ||
6d5786a3 | 732 | xid = get_xid(); |
92fc65a7 PS |
733 | tcon = tlink_tcon(cfile->tlink); |
734 | server = tcon->ses->server; | |
1da177e4 | 735 | |
f96637be | 736 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
92fc65a7 PS |
737 | spin_lock(&cifs_file_list_lock); |
738 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
739 | cfile->invalidHandle = true; | |
740 | spin_unlock(&cifs_file_list_lock); | |
741 | if (server->ops->close_dir) | |
742 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
743 | else | |
744 | rc = -ENOSYS; | |
f96637be | 745 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
746 | /* not much we can do if it fails anyway, ignore rc */ |
747 | rc = 0; | |
748 | } else | |
749 | spin_unlock(&cifs_file_list_lock); | |
750 | ||
751 | buf = cfile->srch_inf.ntwrk_buf_start; | |
752 | if (buf) { | |
f96637be | 753 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
754 | cfile->srch_inf.ntwrk_buf_start = NULL; |
755 | if (cfile->srch_inf.smallBuf) | |
756 | cifs_small_buf_release(buf); | |
757 | else | |
758 | cifs_buf_release(buf); | |
1da177e4 | 759 | } |
92fc65a7 PS |
760 | |
761 | cifs_put_tlink(cfile->tlink); | |
762 | kfree(file->private_data); | |
763 | file->private_data = NULL; | |
1da177e4 | 764 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 765 | free_xid(xid); |
1da177e4 LT |
766 | return rc; |
767 | } | |
768 | ||
85160e03 | 769 | static struct cifsLockInfo * |
fbd35aca | 770 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 771 | { |
a88b4707 | 772 | struct cifsLockInfo *lock = |
fb8c4b14 | 773 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
774 | if (!lock) |
775 | return lock; | |
776 | lock->offset = offset; | |
777 | lock->length = length; | |
778 | lock->type = type; | |
a88b4707 PS |
779 | lock->pid = current->tgid; |
780 | INIT_LIST_HEAD(&lock->blist); | |
781 | init_waitqueue_head(&lock->block_q); | |
782 | return lock; | |
85160e03 PS |
783 | } |
784 | ||
f7ba7fe6 | 785 | void |
85160e03 PS |
786 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
787 | { | |
788 | struct cifsLockInfo *li, *tmp; | |
789 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
790 | list_del_init(&li->blist); | |
791 | wake_up(&li->block_q); | |
792 | } | |
793 | } | |
794 | ||
081c0414 PS |
795 | #define CIFS_LOCK_OP 0 |
796 | #define CIFS_READ_OP 1 | |
797 | #define CIFS_WRITE_OP 2 | |
798 | ||
799 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 800 | static bool |
f45d3416 PS |
801 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
802 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 803 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 804 | { |
fbd35aca | 805 | struct cifsLockInfo *li; |
f45d3416 | 806 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 807 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 808 | |
f45d3416 | 809 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
810 | if (offset + length <= li->offset || |
811 | offset >= li->offset + li->length) | |
812 | continue; | |
081c0414 PS |
813 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
814 | server->ops->compare_fids(cfile, cur_cfile)) { | |
815 | /* shared lock prevents write op through the same fid */ | |
816 | if (!(li->type & server->vals->shared_lock_type) || | |
817 | rw_check != CIFS_WRITE_OP) | |
818 | continue; | |
819 | } | |
f45d3416 PS |
820 | if ((type & server->vals->shared_lock_type) && |
821 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
822 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 823 | continue; |
579f9053 PS |
824 | if (conf_lock) |
825 | *conf_lock = li; | |
f45d3416 | 826 | return true; |
85160e03 PS |
827 | } |
828 | return false; | |
829 | } | |
830 | ||
579f9053 | 831 | bool |
55157dfb | 832 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 833 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 834 | int rw_check) |
161ebf9f | 835 | { |
fbd35aca | 836 | bool rc = false; |
f45d3416 | 837 | struct cifs_fid_locks *cur; |
55157dfb | 838 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 839 | |
f45d3416 PS |
840 | list_for_each_entry(cur, &cinode->llist, llist) { |
841 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 842 | cfile, conf_lock, rw_check); |
fbd35aca PS |
843 | if (rc) |
844 | break; | |
845 | } | |
fbd35aca PS |
846 | |
847 | return rc; | |
161ebf9f PS |
848 | } |
849 | ||
9a5101c8 PS |
850 | /* |
851 | * Check if there is another lock that prevents us to set the lock (mandatory | |
852 | * style). If such a lock exists, update the flock structure with its | |
853 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
854 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
855 | * the server or 1 otherwise. | |
856 | */ | |
85160e03 | 857 | static int |
fbd35aca PS |
858 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
859 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
860 | { |
861 | int rc = 0; | |
862 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 863 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 864 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
865 | bool exist; |
866 | ||
1b4b55a1 | 867 | down_read(&cinode->lock_sem); |
85160e03 | 868 | |
55157dfb | 869 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 870 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
871 | if (exist) { |
872 | flock->fl_start = conf_lock->offset; | |
873 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
874 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 875 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
876 | flock->fl_type = F_RDLCK; |
877 | else | |
878 | flock->fl_type = F_WRLCK; | |
879 | } else if (!cinode->can_cache_brlcks) | |
880 | rc = 1; | |
881 | else | |
882 | flock->fl_type = F_UNLCK; | |
883 | ||
1b4b55a1 | 884 | up_read(&cinode->lock_sem); |
85160e03 PS |
885 | return rc; |
886 | } | |
887 | ||
161ebf9f | 888 | static void |
fbd35aca | 889 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 890 | { |
fbd35aca | 891 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 892 | down_write(&cinode->lock_sem); |
f45d3416 | 893 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 894 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
895 | } |
896 | ||
9a5101c8 PS |
897 | /* |
898 | * Set the byte-range lock (mandatory style). Returns: | |
899 | * 1) 0, if we set the lock and don't need to request to the server; | |
900 | * 2) 1, if no locks prevent us but we need to request to the server; | |
901 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
902 | */ | |
85160e03 | 903 | static int |
fbd35aca | 904 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 905 | bool wait) |
85160e03 | 906 | { |
161ebf9f | 907 | struct cifsLockInfo *conf_lock; |
fbd35aca | 908 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
909 | bool exist; |
910 | int rc = 0; | |
911 | ||
85160e03 PS |
912 | try_again: |
913 | exist = false; | |
1b4b55a1 | 914 | down_write(&cinode->lock_sem); |
85160e03 | 915 | |
55157dfb | 916 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 917 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 918 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 919 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 920 | up_write(&cinode->lock_sem); |
85160e03 PS |
921 | return rc; |
922 | } | |
923 | ||
924 | if (!exist) | |
925 | rc = 1; | |
926 | else if (!wait) | |
927 | rc = -EACCES; | |
928 | else { | |
929 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 930 | up_write(&cinode->lock_sem); |
85160e03 PS |
931 | rc = wait_event_interruptible(lock->block_q, |
932 | (lock->blist.prev == &lock->blist) && | |
933 | (lock->blist.next == &lock->blist)); | |
934 | if (!rc) | |
935 | goto try_again; | |
1b4b55a1 | 936 | down_write(&cinode->lock_sem); |
a88b4707 | 937 | list_del_init(&lock->blist); |
85160e03 PS |
938 | } |
939 | ||
1b4b55a1 | 940 | up_write(&cinode->lock_sem); |
85160e03 PS |
941 | return rc; |
942 | } | |
943 | ||
9a5101c8 PS |
944 | /* |
945 | * Check if there is another lock that prevents us to set the lock (posix | |
946 | * style). If such a lock exists, update the flock structure with its | |
947 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
948 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
949 | * the server or 1 otherwise. | |
950 | */ | |
85160e03 | 951 | static int |
4f6bcec9 PS |
952 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
953 | { | |
954 | int rc = 0; | |
496ad9aa | 955 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
956 | unsigned char saved_type = flock->fl_type; |
957 | ||
50792760 PS |
958 | if ((flock->fl_flags & FL_POSIX) == 0) |
959 | return 1; | |
960 | ||
1b4b55a1 | 961 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
962 | posix_test_lock(file, flock); |
963 | ||
964 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
965 | flock->fl_type = saved_type; | |
966 | rc = 1; | |
967 | } | |
968 | ||
1b4b55a1 | 969 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
970 | return rc; |
971 | } | |
972 | ||
9a5101c8 PS |
973 | /* |
974 | * Set the byte-range lock (posix style). Returns: | |
975 | * 1) 0, if we set the lock and don't need to request to the server; | |
976 | * 2) 1, if we need to request to the server; | |
977 | * 3) <0, if the error occurs while setting the lock. | |
978 | */ | |
4f6bcec9 PS |
979 | static int |
980 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
981 | { | |
496ad9aa | 982 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
983 | int rc = 1; |
984 | ||
985 | if ((flock->fl_flags & FL_POSIX) == 0) | |
986 | return rc; | |
4f6bcec9 | 987 | |
66189be7 | 988 | try_again: |
1b4b55a1 | 989 | down_write(&cinode->lock_sem); |
4f6bcec9 | 990 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 991 | up_write(&cinode->lock_sem); |
50792760 | 992 | return rc; |
4f6bcec9 | 993 | } |
66189be7 PS |
994 | |
995 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 996 | up_write(&cinode->lock_sem); |
66189be7 PS |
997 | if (rc == FILE_LOCK_DEFERRED) { |
998 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
999 | if (!rc) | |
1000 | goto try_again; | |
1001 | locks_delete_block(flock); | |
1002 | } | |
9ebb389d | 1003 | return rc; |
4f6bcec9 PS |
1004 | } |
1005 | ||
d39a4f71 | 1006 | int |
4f6bcec9 | 1007 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1008 | { |
6d5786a3 PS |
1009 | unsigned int xid; |
1010 | int rc = 0, stored_rc; | |
85160e03 PS |
1011 | struct cifsLockInfo *li, *tmp; |
1012 | struct cifs_tcon *tcon; | |
0013fb4c | 1013 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1014 | LOCKING_ANDX_RANGE *buf, *cur; |
1015 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1016 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1017 | int i; | |
85160e03 | 1018 | |
6d5786a3 | 1019 | xid = get_xid(); |
85160e03 PS |
1020 | tcon = tlink_tcon(cfile->tlink); |
1021 | ||
0013fb4c PS |
1022 | /* |
1023 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1024 | * and check it for zero before using. | |
1025 | */ | |
1026 | max_buf = tcon->ses->server->maxBuf; | |
1027 | if (!max_buf) { | |
6d5786a3 | 1028 | free_xid(xid); |
0013fb4c PS |
1029 | return -EINVAL; |
1030 | } | |
1031 | ||
1032 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1033 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1034 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1035 | if (!buf) { | |
6d5786a3 | 1036 | free_xid(xid); |
e2f2886a | 1037 | return -ENOMEM; |
32b9aaf1 PS |
1038 | } |
1039 | ||
1040 | for (i = 0; i < 2; i++) { | |
1041 | cur = buf; | |
1042 | num = 0; | |
f45d3416 | 1043 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1044 | if (li->type != types[i]) |
1045 | continue; | |
1046 | cur->Pid = cpu_to_le16(li->pid); | |
1047 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1048 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1049 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1050 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1051 | if (++num == max_num) { | |
4b4de76e PS |
1052 | stored_rc = cifs_lockv(xid, tcon, |
1053 | cfile->fid.netfid, | |
04a6aa8a PS |
1054 | (__u8)li->type, 0, num, |
1055 | buf); | |
32b9aaf1 PS |
1056 | if (stored_rc) |
1057 | rc = stored_rc; | |
1058 | cur = buf; | |
1059 | num = 0; | |
1060 | } else | |
1061 | cur++; | |
1062 | } | |
1063 | ||
1064 | if (num) { | |
4b4de76e | 1065 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1066 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1067 | if (stored_rc) |
1068 | rc = stored_rc; | |
1069 | } | |
85160e03 PS |
1070 | } |
1071 | ||
32b9aaf1 | 1072 | kfree(buf); |
6d5786a3 | 1073 | free_xid(xid); |
85160e03 PS |
1074 | return rc; |
1075 | } | |
1076 | ||
4f6bcec9 PS |
1077 | /* copied from fs/locks.c with a name change */ |
1078 | #define cifs_for_each_lock(inode, lockp) \ | |
1079 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1080 | lockp = &(*lockp)->fl_next) | |
1081 | ||
d5751469 PS |
1082 | struct lock_to_push { |
1083 | struct list_head llist; | |
1084 | __u64 offset; | |
1085 | __u64 length; | |
1086 | __u32 pid; | |
1087 | __u16 netfid; | |
1088 | __u8 type; | |
1089 | }; | |
1090 | ||
4f6bcec9 | 1091 | static int |
b8db928b | 1092 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1093 | { |
4f6bcec9 PS |
1094 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1095 | struct file_lock *flock, **before; | |
d5751469 | 1096 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1097 | int rc = 0, xid, type; |
d5751469 PS |
1098 | struct list_head locks_to_send, *el; |
1099 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1100 | __u64 length; |
4f6bcec9 | 1101 | |
6d5786a3 | 1102 | xid = get_xid(); |
4f6bcec9 | 1103 | |
d5751469 PS |
1104 | lock_flocks(); |
1105 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1106 | if ((*before)->fl_flags & FL_POSIX) | |
1107 | count++; | |
1108 | } | |
1109 | unlock_flocks(); | |
1110 | ||
4f6bcec9 PS |
1111 | INIT_LIST_HEAD(&locks_to_send); |
1112 | ||
d5751469 | 1113 | /* |
ce85852b | 1114 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1115 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1116 | * protects locking operations of this inode. |
d5751469 PS |
1117 | */ |
1118 | for (; i < count; i++) { | |
1119 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1120 | if (!lck) { | |
1121 | rc = -ENOMEM; | |
1122 | goto err_out; | |
1123 | } | |
1124 | list_add_tail(&lck->llist, &locks_to_send); | |
1125 | } | |
1126 | ||
d5751469 | 1127 | el = locks_to_send.next; |
4f6bcec9 PS |
1128 | lock_flocks(); |
1129 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1130 | flock = *before; |
1131 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1132 | continue; | |
d5751469 | 1133 | if (el == &locks_to_send) { |
ce85852b PS |
1134 | /* |
1135 | * The list ended. We don't have enough allocated | |
1136 | * structures - something is really wrong. | |
1137 | */ | |
f96637be | 1138 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1139 | break; |
1140 | } | |
4f6bcec9 PS |
1141 | length = 1 + flock->fl_end - flock->fl_start; |
1142 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1143 | type = CIFS_RDLCK; | |
1144 | else | |
1145 | type = CIFS_WRLCK; | |
d5751469 | 1146 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1147 | lck->pid = flock->fl_pid; |
4b4de76e | 1148 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1149 | lck->length = length; |
1150 | lck->type = type; | |
1151 | lck->offset = flock->fl_start; | |
d5751469 | 1152 | el = el->next; |
4f6bcec9 | 1153 | } |
4f6bcec9 PS |
1154 | unlock_flocks(); |
1155 | ||
1156 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1157 | int stored_rc; |
1158 | ||
4f6bcec9 | 1159 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1160 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1161 | lck->type, 0); |
1162 | if (stored_rc) | |
1163 | rc = stored_rc; | |
1164 | list_del(&lck->llist); | |
1165 | kfree(lck); | |
1166 | } | |
1167 | ||
d5751469 | 1168 | out: |
6d5786a3 | 1169 | free_xid(xid); |
4f6bcec9 | 1170 | return rc; |
d5751469 PS |
1171 | err_out: |
1172 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1173 | list_del(&lck->llist); | |
1174 | kfree(lck); | |
1175 | } | |
1176 | goto out; | |
4f6bcec9 PS |
1177 | } |
1178 | ||
9ec3c882 | 1179 | static int |
b8db928b | 1180 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1181 | { |
b8db928b | 1182 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1183 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1184 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1185 | int rc = 0; |
1186 | ||
1187 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1188 | down_write(&cinode->lock_sem); | |
1189 | if (!cinode->can_cache_brlcks) { | |
1190 | up_write(&cinode->lock_sem); | |
1191 | return rc; | |
1192 | } | |
4f6bcec9 | 1193 | |
29e20f9c | 1194 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1195 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1196 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1197 | rc = cifs_push_posix_locks(cfile); |
1198 | else | |
1199 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1200 | |
b8db928b PS |
1201 | cinode->can_cache_brlcks = false; |
1202 | up_write(&cinode->lock_sem); | |
1203 | return rc; | |
4f6bcec9 PS |
1204 | } |
1205 | ||
03776f45 | 1206 | static void |
04a6aa8a | 1207 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1208 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1209 | { |
03776f45 | 1210 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1211 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1212 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1213 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1214 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1215 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1216 | *wait_flag = true; |
1da177e4 | 1217 | } |
03776f45 | 1218 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1219 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1220 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1221 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1222 | if (flock->fl_flags & |
3d6d854a JL |
1223 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1224 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1225 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1226 | |
106dc538 | 1227 | *type = server->vals->large_lock_type; |
03776f45 | 1228 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1229 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1230 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1231 | *lock = 1; |
1232 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1233 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1234 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1235 | *unlock = 1; |
1236 | /* Check if unlock includes more than one lock range */ | |
1237 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1238 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1239 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1240 | *lock = 1; |
1241 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1242 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1243 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1244 | *lock = 1; |
1245 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1246 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1247 | *type |= server->vals->shared_lock_type; |
03776f45 | 1248 | *lock = 1; |
1da177e4 | 1249 | } else |
f96637be | 1250 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1251 | } |
1da177e4 | 1252 | |
03776f45 | 1253 | static int |
04a6aa8a | 1254 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1255 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1256 | { |
1257 | int rc = 0; | |
1258 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1259 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1260 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1261 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1262 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1263 | |
03776f45 PS |
1264 | if (posix_lck) { |
1265 | int posix_lock_type; | |
4f6bcec9 PS |
1266 | |
1267 | rc = cifs_posix_lock_test(file, flock); | |
1268 | if (!rc) | |
1269 | return rc; | |
1270 | ||
106dc538 | 1271 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1272 | posix_lock_type = CIFS_RDLCK; |
1273 | else | |
1274 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1275 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1276 | flock->fl_start, length, flock, |
4f6bcec9 | 1277 | posix_lock_type, wait_flag); |
03776f45 PS |
1278 | return rc; |
1279 | } | |
1da177e4 | 1280 | |
fbd35aca | 1281 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1282 | if (!rc) |
1283 | return rc; | |
1284 | ||
03776f45 | 1285 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1286 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1287 | 1, 0, false); | |
03776f45 | 1288 | if (rc == 0) { |
d39a4f71 PS |
1289 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1290 | type, 0, 1, false); | |
03776f45 PS |
1291 | flock->fl_type = F_UNLCK; |
1292 | if (rc != 0) | |
f96637be JP |
1293 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1294 | rc); | |
a88b4707 | 1295 | return 0; |
1da177e4 | 1296 | } |
7ee1af76 | 1297 | |
106dc538 | 1298 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1299 | flock->fl_type = F_WRLCK; |
a88b4707 | 1300 | return 0; |
7ee1af76 JA |
1301 | } |
1302 | ||
d39a4f71 PS |
1303 | type &= ~server->vals->exclusive_lock_type; |
1304 | ||
1305 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1306 | type | server->vals->shared_lock_type, | |
1307 | 1, 0, false); | |
03776f45 | 1308 | if (rc == 0) { |
d39a4f71 PS |
1309 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1310 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1311 | flock->fl_type = F_RDLCK; |
1312 | if (rc != 0) | |
f96637be JP |
1313 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1314 | rc); | |
03776f45 PS |
1315 | } else |
1316 | flock->fl_type = F_WRLCK; | |
1317 | ||
a88b4707 | 1318 | return 0; |
03776f45 PS |
1319 | } |
1320 | ||
f7ba7fe6 | 1321 | void |
9ee305b7 PS |
1322 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1323 | { | |
1324 | struct list_head *li, *tmp; | |
1325 | list_for_each_safe(li, tmp, source) | |
1326 | list_move(li, dest); | |
1327 | } | |
1328 | ||
f7ba7fe6 | 1329 | void |
9ee305b7 PS |
1330 | cifs_free_llist(struct list_head *llist) |
1331 | { | |
1332 | struct cifsLockInfo *li, *tmp; | |
1333 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1334 | cifs_del_lock_waiters(li); | |
1335 | list_del(&li->llist); | |
1336 | kfree(li); | |
1337 | } | |
1338 | } | |
1339 | ||
d39a4f71 | 1340 | int |
6d5786a3 PS |
1341 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1342 | unsigned int xid) | |
9ee305b7 PS |
1343 | { |
1344 | int rc = 0, stored_rc; | |
1345 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1346 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1347 | unsigned int i; | |
0013fb4c | 1348 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1349 | LOCKING_ANDX_RANGE *buf, *cur; |
1350 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1351 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1352 | struct cifsLockInfo *li, *tmp; | |
1353 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1354 | struct list_head tmp_llist; | |
1355 | ||
1356 | INIT_LIST_HEAD(&tmp_llist); | |
1357 | ||
0013fb4c PS |
1358 | /* |
1359 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1360 | * and check it for zero before using. | |
1361 | */ | |
1362 | max_buf = tcon->ses->server->maxBuf; | |
1363 | if (!max_buf) | |
1364 | return -EINVAL; | |
1365 | ||
1366 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1367 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1368 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1369 | if (!buf) | |
1370 | return -ENOMEM; | |
1371 | ||
1b4b55a1 | 1372 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1373 | for (i = 0; i < 2; i++) { |
1374 | cur = buf; | |
1375 | num = 0; | |
f45d3416 | 1376 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1377 | if (flock->fl_start > li->offset || |
1378 | (flock->fl_start + length) < | |
1379 | (li->offset + li->length)) | |
1380 | continue; | |
1381 | if (current->tgid != li->pid) | |
1382 | continue; | |
9ee305b7 PS |
1383 | if (types[i] != li->type) |
1384 | continue; | |
ea319d57 | 1385 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1386 | /* |
1387 | * We can cache brlock requests - simply remove | |
fbd35aca | 1388 | * a lock from the file's list. |
9ee305b7 PS |
1389 | */ |
1390 | list_del(&li->llist); | |
1391 | cifs_del_lock_waiters(li); | |
1392 | kfree(li); | |
ea319d57 | 1393 | continue; |
9ee305b7 | 1394 | } |
ea319d57 PS |
1395 | cur->Pid = cpu_to_le16(li->pid); |
1396 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1397 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1398 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1399 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1400 | /* | |
1401 | * We need to save a lock here to let us add it again to | |
1402 | * the file's list if the unlock range request fails on | |
1403 | * the server. | |
1404 | */ | |
1405 | list_move(&li->llist, &tmp_llist); | |
1406 | if (++num == max_num) { | |
4b4de76e PS |
1407 | stored_rc = cifs_lockv(xid, tcon, |
1408 | cfile->fid.netfid, | |
ea319d57 PS |
1409 | li->type, num, 0, buf); |
1410 | if (stored_rc) { | |
1411 | /* | |
1412 | * We failed on the unlock range | |
1413 | * request - add all locks from the tmp | |
1414 | * list to the head of the file's list. | |
1415 | */ | |
1416 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1417 | &cfile->llist->locks); |
ea319d57 PS |
1418 | rc = stored_rc; |
1419 | } else | |
1420 | /* | |
1421 | * The unlock range request succeed - | |
1422 | * free the tmp list. | |
1423 | */ | |
1424 | cifs_free_llist(&tmp_llist); | |
1425 | cur = buf; | |
1426 | num = 0; | |
1427 | } else | |
1428 | cur++; | |
9ee305b7 PS |
1429 | } |
1430 | if (num) { | |
4b4de76e | 1431 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1432 | types[i], num, 0, buf); |
1433 | if (stored_rc) { | |
f45d3416 PS |
1434 | cifs_move_llist(&tmp_llist, |
1435 | &cfile->llist->locks); | |
9ee305b7 PS |
1436 | rc = stored_rc; |
1437 | } else | |
1438 | cifs_free_llist(&tmp_llist); | |
1439 | } | |
1440 | } | |
1441 | ||
1b4b55a1 | 1442 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1443 | kfree(buf); |
1444 | return rc; | |
1445 | } | |
1446 | ||
03776f45 | 1447 | static int |
f45d3416 | 1448 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1449 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1450 | unsigned int xid) | |
03776f45 PS |
1451 | { |
1452 | int rc = 0; | |
1453 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1454 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1455 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1456 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1457 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1458 | |
1459 | if (posix_lck) { | |
08547b03 | 1460 | int posix_lock_type; |
4f6bcec9 PS |
1461 | |
1462 | rc = cifs_posix_lock_set(file, flock); | |
1463 | if (!rc || rc < 0) | |
1464 | return rc; | |
1465 | ||
106dc538 | 1466 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1467 | posix_lock_type = CIFS_RDLCK; |
1468 | else | |
1469 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1470 | |
03776f45 | 1471 | if (unlock == 1) |
beb84dc8 | 1472 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1473 | |
f45d3416 PS |
1474 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1475 | current->tgid, flock->fl_start, length, | |
1476 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1477 | goto out; |
1478 | } | |
7ee1af76 | 1479 | |
03776f45 | 1480 | if (lock) { |
161ebf9f PS |
1481 | struct cifsLockInfo *lock; |
1482 | ||
fbd35aca | 1483 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1484 | if (!lock) |
1485 | return -ENOMEM; | |
1486 | ||
fbd35aca | 1487 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1488 | if (rc < 0) { |
161ebf9f | 1489 | kfree(lock); |
21cb2d90 PS |
1490 | return rc; |
1491 | } | |
1492 | if (!rc) | |
85160e03 PS |
1493 | goto out; |
1494 | ||
63b7d3a4 PS |
1495 | /* |
1496 | * Windows 7 server can delay breaking lease from read to None | |
1497 | * if we set a byte-range lock on a file - break it explicitly | |
1498 | * before sending the lock to the server to be sure the next | |
1499 | * read won't conflict with non-overlapted locks due to | |
1500 | * pagereading. | |
1501 | */ | |
1502 | if (!CIFS_I(inode)->clientCanCacheAll && | |
1503 | CIFS_I(inode)->clientCanCacheRead) { | |
1504 | cifs_invalidate_mapping(inode); | |
f96637be JP |
1505 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1506 | inode); | |
63b7d3a4 PS |
1507 | CIFS_I(inode)->clientCanCacheRead = false; |
1508 | } | |
1509 | ||
d39a4f71 PS |
1510 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1511 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1512 | if (rc) { |
1513 | kfree(lock); | |
21cb2d90 | 1514 | return rc; |
03776f45 | 1515 | } |
161ebf9f | 1516 | |
fbd35aca | 1517 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1518 | } else if (unlock) |
d39a4f71 | 1519 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1520 | |
03776f45 PS |
1521 | out: |
1522 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1523 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1524 | return rc; |
1525 | } | |
1526 | ||
1527 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1528 | { | |
1529 | int rc, xid; | |
1530 | int lock = 0, unlock = 0; | |
1531 | bool wait_flag = false; | |
1532 | bool posix_lck = false; | |
1533 | struct cifs_sb_info *cifs_sb; | |
1534 | struct cifs_tcon *tcon; | |
1535 | struct cifsInodeInfo *cinode; | |
1536 | struct cifsFileInfo *cfile; | |
1537 | __u16 netfid; | |
04a6aa8a | 1538 | __u32 type; |
03776f45 PS |
1539 | |
1540 | rc = -EACCES; | |
6d5786a3 | 1541 | xid = get_xid(); |
03776f45 | 1542 | |
f96637be JP |
1543 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1544 | cmd, flock->fl_flags, flock->fl_type, | |
1545 | flock->fl_start, flock->fl_end); | |
03776f45 | 1546 | |
03776f45 PS |
1547 | cfile = (struct cifsFileInfo *)file->private_data; |
1548 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1549 | |
1550 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1551 | tcon->ses->server); | |
1552 | ||
1553 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1554 | netfid = cfile->fid.netfid; |
496ad9aa | 1555 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1556 | |
29e20f9c | 1557 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1558 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1559 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1560 | posix_lck = true; | |
1561 | /* | |
1562 | * BB add code here to normalize offset and length to account for | |
1563 | * negative length which we can not accept over the wire. | |
1564 | */ | |
1565 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1566 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1567 | free_xid(xid); |
03776f45 PS |
1568 | return rc; |
1569 | } | |
1570 | ||
1571 | if (!lock && !unlock) { | |
1572 | /* | |
1573 | * if no lock or unlock then nothing to do since we do not | |
1574 | * know what it is | |
1575 | */ | |
6d5786a3 | 1576 | free_xid(xid); |
03776f45 | 1577 | return -EOPNOTSUPP; |
7ee1af76 JA |
1578 | } |
1579 | ||
03776f45 PS |
1580 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1581 | xid); | |
6d5786a3 | 1582 | free_xid(xid); |
1da177e4 LT |
1583 | return rc; |
1584 | } | |
1585 | ||
597b027f JL |
1586 | /* |
1587 | * update the file size (if needed) after a write. Should be called with | |
1588 | * the inode->i_lock held | |
1589 | */ | |
72432ffc | 1590 | void |
fbec9ab9 JL |
1591 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1592 | unsigned int bytes_written) | |
1593 | { | |
1594 | loff_t end_of_write = offset + bytes_written; | |
1595 | ||
1596 | if (end_of_write > cifsi->server_eof) | |
1597 | cifsi->server_eof = end_of_write; | |
1598 | } | |
1599 | ||
ba9ad725 PS |
1600 | static ssize_t |
1601 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1602 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1603 | { |
1604 | int rc = 0; | |
1605 | unsigned int bytes_written = 0; | |
1606 | unsigned int total_written; | |
1607 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1608 | struct cifs_tcon *tcon; |
1609 | struct TCP_Server_Info *server; | |
6d5786a3 | 1610 | unsigned int xid; |
7da4b49a JL |
1611 | struct dentry *dentry = open_file->dentry; |
1612 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1613 | struct cifs_io_parms io_parms; |
1da177e4 | 1614 | |
7da4b49a | 1615 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1616 | |
f96637be JP |
1617 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n", |
1618 | write_size, *offset, dentry->d_name.name); | |
1da177e4 | 1619 | |
ba9ad725 PS |
1620 | tcon = tlink_tcon(open_file->tlink); |
1621 | server = tcon->ses->server; | |
1622 | ||
1623 | if (!server->ops->sync_write) | |
1624 | return -ENOSYS; | |
50c2f753 | 1625 | |
6d5786a3 | 1626 | xid = get_xid(); |
1da177e4 | 1627 | |
1da177e4 LT |
1628 | for (total_written = 0; write_size > total_written; |
1629 | total_written += bytes_written) { | |
1630 | rc = -EAGAIN; | |
1631 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1632 | struct kvec iov[2]; |
1633 | unsigned int len; | |
1634 | ||
1da177e4 | 1635 | if (open_file->invalidHandle) { |
1da177e4 LT |
1636 | /* we could deadlock if we called |
1637 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1638 | reopen_file not to flush data to |
1da177e4 | 1639 | server now */ |
15886177 | 1640 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1641 | if (rc != 0) |
1642 | break; | |
1643 | } | |
ca83ce3d JL |
1644 | |
1645 | len = min((size_t)cifs_sb->wsize, | |
1646 | write_size - total_written); | |
1647 | /* iov[0] is reserved for smb header */ | |
1648 | iov[1].iov_base = (char *)write_data + total_written; | |
1649 | iov[1].iov_len = len; | |
fa2989f4 | 1650 | io_parms.pid = pid; |
ba9ad725 PS |
1651 | io_parms.tcon = tcon; |
1652 | io_parms.offset = *offset; | |
fa2989f4 | 1653 | io_parms.length = len; |
ba9ad725 PS |
1654 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1655 | &bytes_written, iov, 1); | |
1da177e4 LT |
1656 | } |
1657 | if (rc || (bytes_written == 0)) { | |
1658 | if (total_written) | |
1659 | break; | |
1660 | else { | |
6d5786a3 | 1661 | free_xid(xid); |
1da177e4 LT |
1662 | return rc; |
1663 | } | |
fbec9ab9 | 1664 | } else { |
597b027f | 1665 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1666 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1667 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1668 | *offset += bytes_written; |
fbec9ab9 | 1669 | } |
1da177e4 LT |
1670 | } |
1671 | ||
ba9ad725 | 1672 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1673 | |
7da4b49a JL |
1674 | if (total_written > 0) { |
1675 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1676 | if (*offset > dentry->d_inode->i_size) |
1677 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1678 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1679 | } |
7da4b49a | 1680 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1681 | free_xid(xid); |
1da177e4 LT |
1682 | return total_written; |
1683 | } | |
1684 | ||
6508d904 JL |
1685 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1686 | bool fsuid_only) | |
630f3f0c SF |
1687 | { |
1688 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1689 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1690 | ||
1691 | /* only filter by fsuid on multiuser mounts */ | |
1692 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1693 | fsuid_only = false; | |
630f3f0c | 1694 | |
4477288a | 1695 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1696 | /* we could simply get the first_list_entry since write-only entries |
1697 | are always at the end of the list but since the first entry might | |
1698 | have a close pending, we go through the whole list */ | |
1699 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1700 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1701 | continue; |
2e396b83 | 1702 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1703 | if (!open_file->invalidHandle) { |
1704 | /* found a good file */ | |
1705 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1706 | cifsFileInfo_get_locked(open_file); |
4477288a | 1707 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1708 | return open_file; |
1709 | } /* else might as well continue, and look for | |
1710 | another, or simply have the caller reopen it | |
1711 | again rather than trying to fix this handle */ | |
1712 | } else /* write only file */ | |
1713 | break; /* write only files are last so must be done */ | |
1714 | } | |
4477288a | 1715 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1716 | return NULL; |
1717 | } | |
630f3f0c | 1718 | |
6508d904 JL |
1719 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1720 | bool fsuid_only) | |
6148a742 | 1721 | { |
2c0c2a08 | 1722 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1723 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1724 | bool any_available = false; |
dd99cd80 | 1725 | int rc; |
2c0c2a08 | 1726 | unsigned int refind = 0; |
6148a742 | 1727 | |
60808233 SF |
1728 | /* Having a null inode here (because mapping->host was set to zero by |
1729 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1730 | it being zero) during stress testcases so we need to check for it */ | |
1731 | ||
fb8c4b14 | 1732 | if (cifs_inode == NULL) { |
f96637be | 1733 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1734 | dump_stack(); |
1735 | return NULL; | |
1736 | } | |
1737 | ||
d3892294 JL |
1738 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1739 | ||
6508d904 JL |
1740 | /* only filter by fsuid on multiuser mounts */ |
1741 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1742 | fsuid_only = false; | |
1743 | ||
4477288a | 1744 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1745 | refind_writable: |
2c0c2a08 SP |
1746 | if (refind > MAX_REOPEN_ATT) { |
1747 | spin_unlock(&cifs_file_list_lock); | |
1748 | return NULL; | |
1749 | } | |
6148a742 | 1750 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1751 | if (!any_available && open_file->pid != current->tgid) |
1752 | continue; | |
fef59fd7 | 1753 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1754 | continue; |
2e396b83 | 1755 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1756 | if (!open_file->invalidHandle) { |
1757 | /* found a good writable file */ | |
764a1b1a | 1758 | cifsFileInfo_get_locked(open_file); |
4477288a | 1759 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1760 | return open_file; |
2c0c2a08 SP |
1761 | } else { |
1762 | if (!inv_file) | |
1763 | inv_file = open_file; | |
9b22b0b7 | 1764 | } |
6148a742 SF |
1765 | } |
1766 | } | |
2846d386 JL |
1767 | /* couldn't find useable FH with same pid, try any available */ |
1768 | if (!any_available) { | |
1769 | any_available = true; | |
1770 | goto refind_writable; | |
1771 | } | |
2c0c2a08 SP |
1772 | |
1773 | if (inv_file) { | |
1774 | any_available = false; | |
764a1b1a | 1775 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1776 | } |
1777 | ||
4477288a | 1778 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1779 | |
1780 | if (inv_file) { | |
1781 | rc = cifs_reopen_file(inv_file, false); | |
1782 | if (!rc) | |
1783 | return inv_file; | |
1784 | else { | |
1785 | spin_lock(&cifs_file_list_lock); | |
1786 | list_move_tail(&inv_file->flist, | |
1787 | &cifs_inode->openFileList); | |
1788 | spin_unlock(&cifs_file_list_lock); | |
1789 | cifsFileInfo_put(inv_file); | |
1790 | spin_lock(&cifs_file_list_lock); | |
1791 | ++refind; | |
1792 | goto refind_writable; | |
1793 | } | |
1794 | } | |
1795 | ||
6148a742 SF |
1796 | return NULL; |
1797 | } | |
1798 | ||
1da177e4 LT |
1799 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1800 | { | |
1801 | struct address_space *mapping = page->mapping; | |
1802 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1803 | char *write_data; | |
1804 | int rc = -EFAULT; | |
1805 | int bytes_written = 0; | |
1da177e4 | 1806 | struct inode *inode; |
6148a742 | 1807 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1808 | |
1809 | if (!mapping || !mapping->host) | |
1810 | return -EFAULT; | |
1811 | ||
1812 | inode = page->mapping->host; | |
1da177e4 LT |
1813 | |
1814 | offset += (loff_t)from; | |
1815 | write_data = kmap(page); | |
1816 | write_data += from; | |
1817 | ||
1818 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1819 | kunmap(page); | |
1820 | return -EIO; | |
1821 | } | |
1822 | ||
1823 | /* racing with truncate? */ | |
1824 | if (offset > mapping->host->i_size) { | |
1825 | kunmap(page); | |
1826 | return 0; /* don't care */ | |
1827 | } | |
1828 | ||
1829 | /* check to make sure that we are not extending the file */ | |
1830 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1831 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1832 | |
6508d904 | 1833 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1834 | if (open_file) { |
fa2989f4 PS |
1835 | bytes_written = cifs_write(open_file, open_file->pid, |
1836 | write_data, to - from, &offset); | |
6ab409b5 | 1837 | cifsFileInfo_put(open_file); |
1da177e4 | 1838 | /* Does mm or vfs already set times? */ |
6148a742 | 1839 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1840 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1841 | rc = 0; |
bb5a9a04 SF |
1842 | else if (bytes_written < 0) |
1843 | rc = bytes_written; | |
6148a742 | 1844 | } else { |
f96637be | 1845 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1846 | rc = -EIO; |
1847 | } | |
1848 | ||
1849 | kunmap(page); | |
1850 | return rc; | |
1851 | } | |
1852 | ||
1da177e4 | 1853 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1854 | struct writeback_control *wbc) |
1da177e4 | 1855 | { |
c3d17b63 JL |
1856 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1857 | bool done = false, scanned = false, range_whole = false; | |
1858 | pgoff_t end, index; | |
1859 | struct cifs_writedata *wdata; | |
c9de5c80 | 1860 | struct TCP_Server_Info *server; |
37c0eb46 | 1861 | struct page *page; |
37c0eb46 | 1862 | int rc = 0; |
50c2f753 | 1863 | |
37c0eb46 | 1864 | /* |
c3d17b63 | 1865 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1866 | * one page at a time via cifs_writepage |
1867 | */ | |
1868 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1869 | return generic_writepages(mapping, wbc); | |
1870 | ||
111ebb6e | 1871 | if (wbc->range_cyclic) { |
37c0eb46 | 1872 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1873 | end = -1; |
1874 | } else { | |
1875 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1876 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1877 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1878 | range_whole = true; |
1879 | scanned = true; | |
37c0eb46 SF |
1880 | } |
1881 | retry: | |
c3d17b63 JL |
1882 | while (!done && index <= end) { |
1883 | unsigned int i, nr_pages, found_pages; | |
1884 | pgoff_t next = 0, tofind; | |
1885 | struct page **pages; | |
1886 | ||
1887 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1888 | end - index) + 1; | |
1889 | ||
c2e87640 JL |
1890 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1891 | cifs_writev_complete); | |
c3d17b63 JL |
1892 | if (!wdata) { |
1893 | rc = -ENOMEM; | |
1894 | break; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * find_get_pages_tag seems to return a max of 256 on each | |
1899 | * iteration, so we must call it several times in order to | |
1900 | * fill the array or the wsize is effectively limited to | |
1901 | * 256 * PAGE_CACHE_SIZE. | |
1902 | */ | |
1903 | found_pages = 0; | |
1904 | pages = wdata->pages; | |
1905 | do { | |
1906 | nr_pages = find_get_pages_tag(mapping, &index, | |
1907 | PAGECACHE_TAG_DIRTY, | |
1908 | tofind, pages); | |
1909 | found_pages += nr_pages; | |
1910 | tofind -= nr_pages; | |
1911 | pages += nr_pages; | |
1912 | } while (nr_pages && tofind && index <= end); | |
1913 | ||
1914 | if (found_pages == 0) { | |
1915 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1916 | break; | |
1917 | } | |
1918 | ||
1919 | nr_pages = 0; | |
1920 | for (i = 0; i < found_pages; i++) { | |
1921 | page = wdata->pages[i]; | |
37c0eb46 SF |
1922 | /* |
1923 | * At this point we hold neither mapping->tree_lock nor | |
1924 | * lock on the page itself: the page may be truncated or | |
1925 | * invalidated (changing page->mapping to NULL), or even | |
1926 | * swizzled back from swapper_space to tmpfs file | |
1927 | * mapping | |
1928 | */ | |
1929 | ||
c3d17b63 | 1930 | if (nr_pages == 0) |
37c0eb46 | 1931 | lock_page(page); |
529ae9aa | 1932 | else if (!trylock_page(page)) |
37c0eb46 SF |
1933 | break; |
1934 | ||
1935 | if (unlikely(page->mapping != mapping)) { | |
1936 | unlock_page(page); | |
1937 | break; | |
1938 | } | |
1939 | ||
111ebb6e | 1940 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1941 | done = true; |
37c0eb46 SF |
1942 | unlock_page(page); |
1943 | break; | |
1944 | } | |
1945 | ||
1946 | if (next && (page->index != next)) { | |
1947 | /* Not next consecutive page */ | |
1948 | unlock_page(page); | |
1949 | break; | |
1950 | } | |
1951 | ||
1952 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1953 | wait_on_page_writeback(page); | |
1954 | ||
1955 | if (PageWriteback(page) || | |
cb876f45 | 1956 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1957 | unlock_page(page); |
1958 | break; | |
1959 | } | |
84d2f07e | 1960 | |
cb876f45 LT |
1961 | /* |
1962 | * This actually clears the dirty bit in the radix tree. | |
1963 | * See cifs_writepage() for more commentary. | |
1964 | */ | |
1965 | set_page_writeback(page); | |
1966 | ||
3a98b861 | 1967 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1968 | done = true; |
84d2f07e | 1969 | unlock_page(page); |
cb876f45 | 1970 | end_page_writeback(page); |
84d2f07e SF |
1971 | break; |
1972 | } | |
1973 | ||
c3d17b63 JL |
1974 | wdata->pages[i] = page; |
1975 | next = page->index + 1; | |
1976 | ++nr_pages; | |
1977 | } | |
37c0eb46 | 1978 | |
c3d17b63 JL |
1979 | /* reset index to refind any pages skipped */ |
1980 | if (nr_pages == 0) | |
1981 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1982 | |
c3d17b63 JL |
1983 | /* put any pages we aren't going to use */ |
1984 | for (i = nr_pages; i < found_pages; i++) { | |
1985 | page_cache_release(wdata->pages[i]); | |
1986 | wdata->pages[i] = NULL; | |
1987 | } | |
37c0eb46 | 1988 | |
c3d17b63 JL |
1989 | /* nothing to write? */ |
1990 | if (nr_pages == 0) { | |
1991 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1992 | continue; | |
37c0eb46 | 1993 | } |
fbec9ab9 | 1994 | |
c3d17b63 JL |
1995 | wdata->sync_mode = wbc->sync_mode; |
1996 | wdata->nr_pages = nr_pages; | |
1997 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
1998 | wdata->pagesz = PAGE_CACHE_SIZE; |
1999 | wdata->tailsz = | |
3a98b861 JL |
2000 | min(i_size_read(mapping->host) - |
2001 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
2002 | (loff_t)PAGE_CACHE_SIZE); |
2003 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
2004 | wdata->tailsz; | |
941b853d | 2005 | |
c3d17b63 JL |
2006 | do { |
2007 | if (wdata->cfile != NULL) | |
2008 | cifsFileInfo_put(wdata->cfile); | |
2009 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
2010 | false); | |
2011 | if (!wdata->cfile) { | |
f96637be | 2012 | cifs_dbg(VFS, "No writable handles for inode\n"); |
c3d17b63 JL |
2013 | rc = -EBADF; |
2014 | break; | |
941b853d | 2015 | } |
fe5f5d2e | 2016 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
2017 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
2018 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 2019 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 2020 | |
c3d17b63 JL |
2021 | for (i = 0; i < nr_pages; ++i) |
2022 | unlock_page(wdata->pages[i]); | |
f3983c21 | 2023 | |
c3d17b63 JL |
2024 | /* send failure -- clean up the mess */ |
2025 | if (rc != 0) { | |
2026 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2027 | if (rc == -EAGAIN) |
c3d17b63 JL |
2028 | redirty_page_for_writepage(wbc, |
2029 | wdata->pages[i]); | |
2030 | else | |
2031 | SetPageError(wdata->pages[i]); | |
2032 | end_page_writeback(wdata->pages[i]); | |
2033 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2034 | } |
941b853d JL |
2035 | if (rc != -EAGAIN) |
2036 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2037 | } |
2038 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2039 | |
c3d17b63 JL |
2040 | wbc->nr_to_write -= nr_pages; |
2041 | if (wbc->nr_to_write <= 0) | |
2042 | done = true; | |
b066a48c | 2043 | |
c3d17b63 | 2044 | index = next; |
37c0eb46 | 2045 | } |
c3d17b63 | 2046 | |
37c0eb46 SF |
2047 | if (!scanned && !done) { |
2048 | /* | |
2049 | * We hit the last page and there is more work to be done: wrap | |
2050 | * back to the start of the file | |
2051 | */ | |
c3d17b63 | 2052 | scanned = true; |
37c0eb46 SF |
2053 | index = 0; |
2054 | goto retry; | |
2055 | } | |
c3d17b63 | 2056 | |
111ebb6e | 2057 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2058 | mapping->writeback_index = index; |
2059 | ||
1da177e4 LT |
2060 | return rc; |
2061 | } | |
1da177e4 | 2062 | |
9ad1506b PS |
2063 | static int |
2064 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2065 | { |
9ad1506b | 2066 | int rc; |
6d5786a3 | 2067 | unsigned int xid; |
1da177e4 | 2068 | |
6d5786a3 | 2069 | xid = get_xid(); |
1da177e4 LT |
2070 | /* BB add check for wbc flags */ |
2071 | page_cache_get(page); | |
ad7a2926 | 2072 | if (!PageUptodate(page)) |
f96637be | 2073 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2074 | |
2075 | /* | |
2076 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2077 | * | |
2078 | * A writepage() implementation always needs to do either this, | |
2079 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2080 | * the case of a failure. | |
2081 | * | |
2082 | * Just unlocking the page will cause the radix tree tag-bits | |
2083 | * to fail to update with the state of the page correctly. | |
2084 | */ | |
fb8c4b14 | 2085 | set_page_writeback(page); |
9ad1506b | 2086 | retry_write: |
1da177e4 | 2087 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2088 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2089 | goto retry_write; | |
2090 | else if (rc == -EAGAIN) | |
2091 | redirty_page_for_writepage(wbc, page); | |
2092 | else if (rc != 0) | |
2093 | SetPageError(page); | |
2094 | else | |
2095 | SetPageUptodate(page); | |
cb876f45 LT |
2096 | end_page_writeback(page); |
2097 | page_cache_release(page); | |
6d5786a3 | 2098 | free_xid(xid); |
1da177e4 LT |
2099 | return rc; |
2100 | } | |
2101 | ||
9ad1506b PS |
2102 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2103 | { | |
2104 | int rc = cifs_writepage_locked(page, wbc); | |
2105 | unlock_page(page); | |
2106 | return rc; | |
2107 | } | |
2108 | ||
d9414774 NP |
2109 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2110 | loff_t pos, unsigned len, unsigned copied, | |
2111 | struct page *page, void *fsdata) | |
1da177e4 | 2112 | { |
d9414774 NP |
2113 | int rc; |
2114 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2115 | struct cifsFileInfo *cfile = file->private_data; |
2116 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2117 | __u32 pid; | |
2118 | ||
2119 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2120 | pid = cfile->pid; | |
2121 | else | |
2122 | pid = current->tgid; | |
1da177e4 | 2123 | |
f96637be | 2124 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2125 | page, pos, copied); |
d9414774 | 2126 | |
a98ee8c1 JL |
2127 | if (PageChecked(page)) { |
2128 | if (copied == len) | |
2129 | SetPageUptodate(page); | |
2130 | ClearPageChecked(page); | |
2131 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2132 | SetPageUptodate(page); |
ad7a2926 | 2133 | |
1da177e4 | 2134 | if (!PageUptodate(page)) { |
d9414774 NP |
2135 | char *page_data; |
2136 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2137 | unsigned int xid; |
d9414774 | 2138 | |
6d5786a3 | 2139 | xid = get_xid(); |
1da177e4 LT |
2140 | /* this is probably better than directly calling |
2141 | partialpage_write since in this function the file handle is | |
2142 | known which we might as well leverage */ | |
2143 | /* BB check if anything else missing out of ppw | |
2144 | such as updating last write time */ | |
2145 | page_data = kmap(page); | |
d4ffff1f | 2146 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2147 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2148 | kunmap(page); |
d9414774 | 2149 | |
6d5786a3 | 2150 | free_xid(xid); |
fb8c4b14 | 2151 | } else { |
d9414774 NP |
2152 | rc = copied; |
2153 | pos += copied; | |
ca8aa29c | 2154 | set_page_dirty(page); |
1da177e4 LT |
2155 | } |
2156 | ||
d9414774 NP |
2157 | if (rc > 0) { |
2158 | spin_lock(&inode->i_lock); | |
2159 | if (pos > inode->i_size) | |
2160 | i_size_write(inode, pos); | |
2161 | spin_unlock(&inode->i_lock); | |
2162 | } | |
2163 | ||
2164 | unlock_page(page); | |
2165 | page_cache_release(page); | |
2166 | ||
1da177e4 LT |
2167 | return rc; |
2168 | } | |
2169 | ||
02c24a82 JB |
2170 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2171 | int datasync) | |
1da177e4 | 2172 | { |
6d5786a3 | 2173 | unsigned int xid; |
1da177e4 | 2174 | int rc = 0; |
96daf2b0 | 2175 | struct cifs_tcon *tcon; |
1d8c4c00 | 2176 | struct TCP_Server_Info *server; |
c21dfb69 | 2177 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2178 | struct inode *inode = file_inode(file); |
8be7e6ba | 2179 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2180 | |
02c24a82 JB |
2181 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2182 | if (rc) | |
2183 | return rc; | |
2184 | mutex_lock(&inode->i_mutex); | |
2185 | ||
6d5786a3 | 2186 | xid = get_xid(); |
1da177e4 | 2187 | |
f96637be JP |
2188 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2189 | file->f_path.dentry->d_name.name, datasync); | |
50c2f753 | 2190 | |
6feb9891 PS |
2191 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2192 | rc = cifs_invalidate_mapping(inode); | |
2193 | if (rc) { | |
f96637be | 2194 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2195 | rc = 0; /* don't care about it in fsync */ |
2196 | } | |
2197 | } | |
eb4b756b | 2198 | |
8be7e6ba | 2199 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2200 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2201 | server = tcon->ses->server; | |
2202 | if (server->ops->flush) | |
2203 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2204 | else | |
2205 | rc = -ENOSYS; | |
2206 | } | |
8be7e6ba | 2207 | |
6d5786a3 | 2208 | free_xid(xid); |
02c24a82 | 2209 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2210 | return rc; |
2211 | } | |
2212 | ||
02c24a82 | 2213 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2214 | { |
6d5786a3 | 2215 | unsigned int xid; |
8be7e6ba | 2216 | int rc = 0; |
96daf2b0 | 2217 | struct cifs_tcon *tcon; |
1d8c4c00 | 2218 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2219 | struct cifsFileInfo *smbfile = file->private_data; |
2220 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2221 | struct inode *inode = file->f_mapping->host; |
2222 | ||
2223 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2224 | if (rc) | |
2225 | return rc; | |
2226 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2227 | |
6d5786a3 | 2228 | xid = get_xid(); |
8be7e6ba | 2229 | |
f96637be JP |
2230 | cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n", |
2231 | file->f_path.dentry->d_name.name, datasync); | |
8be7e6ba PS |
2232 | |
2233 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2234 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2235 | server = tcon->ses->server; | |
2236 | if (server->ops->flush) | |
2237 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2238 | else | |
2239 | rc = -ENOSYS; | |
2240 | } | |
b298f223 | 2241 | |
6d5786a3 | 2242 | free_xid(xid); |
02c24a82 | 2243 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2244 | return rc; |
2245 | } | |
2246 | ||
1da177e4 LT |
2247 | /* |
2248 | * As file closes, flush all cached write data for this inode checking | |
2249 | * for write behind errors. | |
2250 | */ | |
75e1fcc0 | 2251 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2252 | { |
496ad9aa | 2253 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2254 | int rc = 0; |
2255 | ||
eb4b756b | 2256 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2257 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2258 | |
f96637be | 2259 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2260 | |
2261 | return rc; | |
2262 | } | |
2263 | ||
72432ffc PS |
2264 | static int |
2265 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2266 | { | |
2267 | int rc = 0; | |
2268 | unsigned long i; | |
2269 | ||
2270 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2271 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2272 | if (!pages[i]) { |
2273 | /* | |
2274 | * save number of pages we have already allocated and | |
2275 | * return with ENOMEM error | |
2276 | */ | |
2277 | num_pages = i; | |
2278 | rc = -ENOMEM; | |
e94f7ba1 | 2279 | break; |
72432ffc PS |
2280 | } |
2281 | } | |
2282 | ||
e94f7ba1 JL |
2283 | if (rc) { |
2284 | for (i = 0; i < num_pages; i++) | |
2285 | put_page(pages[i]); | |
2286 | } | |
72432ffc PS |
2287 | return rc; |
2288 | } | |
2289 | ||
2290 | static inline | |
2291 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2292 | { | |
2293 | size_t num_pages; | |
2294 | size_t clen; | |
2295 | ||
2296 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2297 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2298 | |
2299 | if (cur_len) | |
2300 | *cur_len = clen; | |
2301 | ||
2302 | return num_pages; | |
2303 | } | |
2304 | ||
da82f7e7 JL |
2305 | static void |
2306 | cifs_uncached_writev_complete(struct work_struct *work) | |
2307 | { | |
2308 | int i; | |
2309 | struct cifs_writedata *wdata = container_of(work, | |
2310 | struct cifs_writedata, work); | |
2311 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2312 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2313 | ||
2314 | spin_lock(&inode->i_lock); | |
2315 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2316 | if (cifsi->server_eof > inode->i_size) | |
2317 | i_size_write(inode, cifsi->server_eof); | |
2318 | spin_unlock(&inode->i_lock); | |
2319 | ||
2320 | complete(&wdata->done); | |
2321 | ||
2322 | if (wdata->result != -EAGAIN) { | |
2323 | for (i = 0; i < wdata->nr_pages; i++) | |
2324 | put_page(wdata->pages[i]); | |
2325 | } | |
2326 | ||
2327 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2328 | } | |
2329 | ||
2330 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2331 | static int | |
2332 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2333 | { | |
2334 | int rc; | |
c9de5c80 PS |
2335 | struct TCP_Server_Info *server; |
2336 | ||
2337 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2338 | |
2339 | do { | |
2340 | if (wdata->cfile->invalidHandle) { | |
2341 | rc = cifs_reopen_file(wdata->cfile, false); | |
2342 | if (rc != 0) | |
2343 | continue; | |
2344 | } | |
c9de5c80 | 2345 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2346 | } while (rc == -EAGAIN); |
2347 | ||
2348 | return rc; | |
2349 | } | |
2350 | ||
72432ffc PS |
2351 | static ssize_t |
2352 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2353 | unsigned long nr_segs, loff_t *poffset) | |
2354 | { | |
da82f7e7 | 2355 | unsigned long nr_pages, i; |
9f0afafe | 2356 | size_t bytes, copied, len, cur_len; |
76429c14 | 2357 | ssize_t total_written = 0; |
3af9d8f2 | 2358 | loff_t offset; |
72432ffc | 2359 | struct iov_iter it; |
72432ffc | 2360 | struct cifsFileInfo *open_file; |
da82f7e7 | 2361 | struct cifs_tcon *tcon; |
72432ffc | 2362 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2363 | struct cifs_writedata *wdata, *tmp; |
2364 | struct list_head wdata_list; | |
2365 | int rc; | |
2366 | pid_t pid; | |
72432ffc PS |
2367 | |
2368 | len = iov_length(iov, nr_segs); | |
2369 | if (!len) | |
2370 | return 0; | |
2371 | ||
2372 | rc = generic_write_checks(file, poffset, &len, 0); | |
2373 | if (rc) | |
2374 | return rc; | |
2375 | ||
da82f7e7 | 2376 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2377 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2378 | open_file = file->private_data; |
da82f7e7 | 2379 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2380 | |
2381 | if (!tcon->ses->server->ops->async_writev) | |
2382 | return -ENOSYS; | |
2383 | ||
3af9d8f2 | 2384 | offset = *poffset; |
d4ffff1f PS |
2385 | |
2386 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2387 | pid = open_file->pid; | |
2388 | else | |
2389 | pid = current->tgid; | |
2390 | ||
72432ffc | 2391 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2392 | do { |
da82f7e7 JL |
2393 | size_t save_len; |
2394 | ||
2395 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2396 | wdata = cifs_writedata_alloc(nr_pages, | |
2397 | cifs_uncached_writev_complete); | |
2398 | if (!wdata) { | |
2399 | rc = -ENOMEM; | |
2400 | break; | |
2401 | } | |
2402 | ||
2403 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2404 | if (rc) { | |
2405 | kfree(wdata); | |
2406 | break; | |
2407 | } | |
2408 | ||
2409 | save_len = cur_len; | |
2410 | for (i = 0; i < nr_pages; i++) { | |
9f0afafe | 2411 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); |
da82f7e7 | 2412 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, |
9f0afafe | 2413 | 0, bytes); |
72432ffc PS |
2414 | cur_len -= copied; |
2415 | iov_iter_advance(&it, copied); | |
9f0afafe JL |
2416 | /* |
2417 | * If we didn't copy as much as we expected, then that | |
2418 | * may mean we trod into an unmapped area. Stop copying | |
2419 | * at that point. On the next pass through the big | |
2420 | * loop, we'll likely end up getting a zero-length | |
2421 | * write and bailing out of it. | |
2422 | */ | |
2423 | if (copied < bytes) | |
2424 | break; | |
72432ffc | 2425 | } |
72432ffc PS |
2426 | cur_len = save_len - cur_len; |
2427 | ||
9f0afafe JL |
2428 | /* |
2429 | * If we have no data to send, then that probably means that | |
2430 | * the copy above failed altogether. That's most likely because | |
2431 | * the address in the iovec was bogus. Set the rc to -EFAULT, | |
2432 | * free anything we allocated and bail out. | |
2433 | */ | |
2434 | if (!cur_len) { | |
2435 | for (i = 0; i < nr_pages; i++) | |
2436 | put_page(wdata->pages[i]); | |
2437 | kfree(wdata); | |
2438 | rc = -EFAULT; | |
2439 | break; | |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * i + 1 now represents the number of pages we actually used in | |
2444 | * the copy phase above. Bring nr_pages down to that, and free | |
2445 | * any pages that we didn't use. | |
2446 | */ | |
2447 | for ( ; nr_pages > i + 1; nr_pages--) | |
2448 | put_page(wdata->pages[nr_pages - 1]); | |
2449 | ||
da82f7e7 JL |
2450 | wdata->sync_mode = WB_SYNC_ALL; |
2451 | wdata->nr_pages = nr_pages; | |
2452 | wdata->offset = (__u64)offset; | |
2453 | wdata->cfile = cifsFileInfo_get(open_file); | |
2454 | wdata->pid = pid; | |
2455 | wdata->bytes = cur_len; | |
eddb079d JL |
2456 | wdata->pagesz = PAGE_SIZE; |
2457 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2458 | rc = cifs_uncached_retry_writev(wdata); |
2459 | if (rc) { | |
2460 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2461 | break; |
2462 | } | |
2463 | ||
da82f7e7 JL |
2464 | list_add_tail(&wdata->list, &wdata_list); |
2465 | offset += cur_len; | |
2466 | len -= cur_len; | |
72432ffc PS |
2467 | } while (len > 0); |
2468 | ||
da82f7e7 JL |
2469 | /* |
2470 | * If at least one write was successfully sent, then discard any rc | |
2471 | * value from the later writes. If the other write succeeds, then | |
2472 | * we'll end up returning whatever was written. If it fails, then | |
2473 | * we'll get a new rc value from that. | |
2474 | */ | |
2475 | if (!list_empty(&wdata_list)) | |
2476 | rc = 0; | |
2477 | ||
2478 | /* | |
2479 | * Wait for and collect replies for any successful sends in order of | |
2480 | * increasing offset. Once an error is hit or we get a fatal signal | |
2481 | * while waiting, then return without waiting for any more replies. | |
2482 | */ | |
2483 | restart_loop: | |
2484 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2485 | if (!rc) { | |
2486 | /* FIXME: freezable too? */ | |
2487 | rc = wait_for_completion_killable(&wdata->done); | |
2488 | if (rc) | |
2489 | rc = -EINTR; | |
2490 | else if (wdata->result) | |
2491 | rc = wdata->result; | |
2492 | else | |
2493 | total_written += wdata->bytes; | |
2494 | ||
2495 | /* resend call if it's a retryable error */ | |
2496 | if (rc == -EAGAIN) { | |
2497 | rc = cifs_uncached_retry_writev(wdata); | |
2498 | goto restart_loop; | |
2499 | } | |
2500 | } | |
2501 | list_del_init(&wdata->list); | |
2502 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2503 | } |
2504 | ||
da82f7e7 JL |
2505 | if (total_written > 0) |
2506 | *poffset += total_written; | |
72432ffc | 2507 | |
da82f7e7 JL |
2508 | cifs_stats_bytes_written(tcon, total_written); |
2509 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2510 | } |
2511 | ||
0b81c1c4 | 2512 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2513 | unsigned long nr_segs, loff_t pos) |
2514 | { | |
2515 | ssize_t written; | |
2516 | struct inode *inode; | |
2517 | ||
496ad9aa | 2518 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2519 | |
2520 | /* | |
2521 | * BB - optimize the way when signing is disabled. We can drop this | |
2522 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2523 | * write request. | |
2524 | */ | |
2525 | ||
2526 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2527 | if (written > 0) { | |
2528 | CIFS_I(inode)->invalid_mapping = true; | |
2529 | iocb->ki_pos = pos; | |
2530 | } | |
2531 | ||
2532 | return written; | |
2533 | } | |
2534 | ||
579f9053 | 2535 | static ssize_t |
ca8aa29c PS |
2536 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, |
2537 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2538 | { |
579f9053 PS |
2539 | struct file *file = iocb->ki_filp; |
2540 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2541 | struct inode *inode = file->f_mapping->host; | |
2542 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2543 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2544 | ssize_t rc = -EACCES; | |
72432ffc | 2545 | |
579f9053 | 2546 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2547 | |
579f9053 PS |
2548 | /* |
2549 | * We need to hold the sem to be sure nobody modifies lock list | |
2550 | * with a brlock that prevents writing. | |
2551 | */ | |
2552 | down_read(&cinode->lock_sem); | |
2553 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2554 | server->vals->exclusive_lock_type, NULL, | |
081c0414 | 2555 | CIFS_WRITE_OP)) { |
579f9053 PS |
2556 | mutex_lock(&inode->i_mutex); |
2557 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
ca8aa29c | 2558 | &iocb->ki_pos); |
579f9053 PS |
2559 | mutex_unlock(&inode->i_mutex); |
2560 | } | |
2561 | ||
2562 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2563 | ssize_t err; | |
2564 | ||
2565 | err = generic_write_sync(file, pos, rc); | |
2566 | if (err < 0 && rc > 0) | |
2567 | rc = err; | |
2568 | } | |
2569 | ||
2570 | up_read(&cinode->lock_sem); | |
579f9053 PS |
2571 | return rc; |
2572 | } | |
2573 | ||
2574 | ssize_t | |
2575 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2576 | unsigned long nr_segs, loff_t pos) | |
2577 | { | |
496ad9aa | 2578 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2579 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2580 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2581 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2582 | iocb->ki_filp->private_data; | |
2583 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2584 | ssize_t written; |
ca8aa29c | 2585 | |
88cf75aa PS |
2586 | if (cinode->clientCanCacheAll) { |
2587 | if (cap_unix(tcon->ses) && | |
2588 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
2589 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2590 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2591 | return cifs_writev(iocb, iov, nr_segs, pos); | |
25078105 | 2592 | } |
25078105 | 2593 | /* |
ca8aa29c PS |
2594 | * For non-oplocked files in strict cache mode we need to write the data |
2595 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2596 | * affected pages because it may cause a error with mandatory locks on | |
2597 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2598 | */ |
88cf75aa PS |
2599 | written = cifs_user_writev(iocb, iov, nr_segs, pos); |
2600 | if (written > 0 && cinode->clientCanCacheRead) { | |
2601 | /* | |
2602 | * Windows 7 server can delay breaking level2 oplock if a write | |
2603 | * request comes - break it on the client to prevent reading | |
2604 | * an old data. | |
2605 | */ | |
2606 | cifs_invalidate_mapping(inode); | |
f96637be JP |
2607 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2608 | inode); | |
88cf75aa PS |
2609 | cinode->clientCanCacheRead = false; |
2610 | } | |
2611 | return written; | |
72432ffc PS |
2612 | } |
2613 | ||
0471ca3f | 2614 | static struct cifs_readdata * |
f4e49cd2 | 2615 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2616 | { |
2617 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2618 | |
c5fab6f4 JL |
2619 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2620 | GFP_KERNEL); | |
0471ca3f | 2621 | if (rdata != NULL) { |
6993f74a | 2622 | kref_init(&rdata->refcount); |
1c892549 JL |
2623 | INIT_LIST_HEAD(&rdata->list); |
2624 | init_completion(&rdata->done); | |
0471ca3f | 2625 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2626 | } |
f4e49cd2 | 2627 | |
0471ca3f JL |
2628 | return rdata; |
2629 | } | |
2630 | ||
6993f74a JL |
2631 | void |
2632 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2633 | { |
6993f74a JL |
2634 | struct cifs_readdata *rdata = container_of(refcount, |
2635 | struct cifs_readdata, refcount); | |
2636 | ||
2637 | if (rdata->cfile) | |
2638 | cifsFileInfo_put(rdata->cfile); | |
2639 | ||
0471ca3f JL |
2640 | kfree(rdata); |
2641 | } | |
2642 | ||
1c892549 | 2643 | static int |
c5fab6f4 | 2644 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2645 | { |
2646 | int rc = 0; | |
c5fab6f4 | 2647 | struct page *page; |
1c892549 JL |
2648 | unsigned int i; |
2649 | ||
c5fab6f4 | 2650 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2651 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2652 | if (!page) { | |
2653 | rc = -ENOMEM; | |
2654 | break; | |
2655 | } | |
c5fab6f4 | 2656 | rdata->pages[i] = page; |
1c892549 JL |
2657 | } |
2658 | ||
2659 | if (rc) { | |
c5fab6f4 JL |
2660 | for (i = 0; i < nr_pages; i++) { |
2661 | put_page(rdata->pages[i]); | |
2662 | rdata->pages[i] = NULL; | |
1c892549 JL |
2663 | } |
2664 | } | |
2665 | return rc; | |
2666 | } | |
2667 | ||
2668 | static void | |
2669 | cifs_uncached_readdata_release(struct kref *refcount) | |
2670 | { | |
1c892549 JL |
2671 | struct cifs_readdata *rdata = container_of(refcount, |
2672 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2673 | unsigned int i; |
1c892549 | 2674 | |
c5fab6f4 JL |
2675 | for (i = 0; i < rdata->nr_pages; i++) { |
2676 | put_page(rdata->pages[i]); | |
2677 | rdata->pages[i] = NULL; | |
1c892549 JL |
2678 | } |
2679 | cifs_readdata_release(refcount); | |
2680 | } | |
2681 | ||
2a1bb138 JL |
2682 | static int |
2683 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2684 | { | |
2685 | int rc; | |
fc9c5966 PS |
2686 | struct TCP_Server_Info *server; |
2687 | ||
2688 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2689 | |
2690 | do { | |
2691 | if (rdata->cfile->invalidHandle) { | |
2692 | rc = cifs_reopen_file(rdata->cfile, true); | |
2693 | if (rc != 0) | |
2694 | continue; | |
2695 | } | |
fc9c5966 | 2696 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2697 | } while (rc == -EAGAIN); |
2698 | ||
2699 | return rc; | |
2700 | } | |
2701 | ||
1c892549 JL |
2702 | /** |
2703 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2704 | * @rdata: the readdata response with list of pages holding data | |
2705 | * @iov: vector in which we should copy the data | |
2706 | * @nr_segs: number of segments in vector | |
2707 | * @offset: offset into file of the first iovec | |
2708 | * @copied: used to return the amount of data copied to the iov | |
2709 | * | |
2710 | * This function copies data from a list of pages in a readdata response into | |
2711 | * an array of iovecs. It will first calculate where the data should go | |
2712 | * based on the info in the readdata and then copy the data into that spot. | |
2713 | */ | |
2714 | static ssize_t | |
2715 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2716 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2717 | { | |
2718 | int rc = 0; | |
2719 | struct iov_iter ii; | |
2720 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2721 | ssize_t remaining = rdata->bytes; |
2722 | unsigned char *pdata; | |
c5fab6f4 | 2723 | unsigned int i; |
1c892549 JL |
2724 | |
2725 | /* set up iov_iter and advance to the correct offset */ | |
2726 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2727 | iov_iter_advance(&ii, pos); | |
2728 | ||
2729 | *copied = 0; | |
c5fab6f4 | 2730 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2731 | ssize_t copy; |
c5fab6f4 | 2732 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2733 | |
2734 | /* copy a whole page or whatever's left */ | |
2735 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2736 | ||
2737 | /* ...but limit it to whatever space is left in the iov */ | |
2738 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2739 | ||
2740 | /* go while there's data to be copied and no errors */ | |
2741 | if (copy && !rc) { | |
2742 | pdata = kmap(page); | |
2743 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2744 | (int)copy); | |
2745 | kunmap(page); | |
2746 | if (!rc) { | |
2747 | *copied += copy; | |
2748 | remaining -= copy; | |
2749 | iov_iter_advance(&ii, copy); | |
2750 | } | |
2751 | } | |
1c892549 JL |
2752 | } |
2753 | ||
2754 | return rc; | |
2755 | } | |
2756 | ||
2757 | static void | |
2758 | cifs_uncached_readv_complete(struct work_struct *work) | |
2759 | { | |
2760 | struct cifs_readdata *rdata = container_of(work, | |
2761 | struct cifs_readdata, work); | |
1c892549 JL |
2762 | |
2763 | complete(&rdata->done); | |
2764 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2765 | } | |
2766 | ||
2767 | static int | |
8321fec4 JL |
2768 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2769 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2770 | { |
8321fec4 | 2771 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2772 | unsigned int i; |
2773 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2774 | struct kvec iov; |
1c892549 | 2775 | |
8321fec4 | 2776 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2777 | for (i = 0; i < nr_pages; i++) { |
2778 | struct page *page = rdata->pages[i]; | |
2779 | ||
8321fec4 | 2780 | if (len >= PAGE_SIZE) { |
1c892549 | 2781 | /* enough data to fill the page */ |
8321fec4 JL |
2782 | iov.iov_base = kmap(page); |
2783 | iov.iov_len = PAGE_SIZE; | |
f96637be JP |
2784 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2785 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2786 | len -= PAGE_SIZE; |
2787 | } else if (len > 0) { | |
1c892549 | 2788 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2789 | iov.iov_base = kmap(page); |
2790 | iov.iov_len = len; | |
f96637be JP |
2791 | cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n", |
2792 | i, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
2793 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); |
2794 | rdata->tailsz = len; | |
2795 | len = 0; | |
1c892549 JL |
2796 | } else { |
2797 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2798 | rdata->pages[i] = NULL; |
2799 | rdata->nr_pages--; | |
1c892549 | 2800 | put_page(page); |
8321fec4 | 2801 | continue; |
1c892549 | 2802 | } |
8321fec4 JL |
2803 | |
2804 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2805 | kunmap(page); | |
2806 | if (result < 0) | |
2807 | break; | |
2808 | ||
2809 | total_read += result; | |
1c892549 JL |
2810 | } |
2811 | ||
8f516091 | 2812 | return total_read > 0 && result != -EAGAIN ? total_read : result; |
1c892549 JL |
2813 | } |
2814 | ||
a70307ee PS |
2815 | static ssize_t |
2816 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2817 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2818 | { |
1c892549 | 2819 | ssize_t rc; |
a70307ee | 2820 | size_t len, cur_len; |
1c892549 JL |
2821 | ssize_t total_read = 0; |
2822 | loff_t offset = *poffset; | |
2823 | unsigned int npages; | |
1da177e4 | 2824 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2825 | struct cifs_tcon *tcon; |
1da177e4 | 2826 | struct cifsFileInfo *open_file; |
1c892549 JL |
2827 | struct cifs_readdata *rdata, *tmp; |
2828 | struct list_head rdata_list; | |
2829 | pid_t pid; | |
a70307ee PS |
2830 | |
2831 | if (!nr_segs) | |
2832 | return 0; | |
2833 | ||
2834 | len = iov_length(iov, nr_segs); | |
2835 | if (!len) | |
2836 | return 0; | |
1da177e4 | 2837 | |
1c892549 | 2838 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2839 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2840 | open_file = file->private_data; |
1c892549 | 2841 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2842 | |
fc9c5966 PS |
2843 | if (!tcon->ses->server->ops->async_readv) |
2844 | return -ENOSYS; | |
2845 | ||
d4ffff1f PS |
2846 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2847 | pid = open_file->pid; | |
2848 | else | |
2849 | pid = current->tgid; | |
2850 | ||
ad7a2926 | 2851 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 2852 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
ad7a2926 | 2853 | |
1c892549 JL |
2854 | do { |
2855 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2856 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2857 | |
1c892549 JL |
2858 | /* allocate a readdata struct */ |
2859 | rdata = cifs_readdata_alloc(npages, | |
2860 | cifs_uncached_readv_complete); | |
2861 | if (!rdata) { | |
2862 | rc = -ENOMEM; | |
2863 | goto error; | |
1da177e4 | 2864 | } |
a70307ee | 2865 | |
c5fab6f4 | 2866 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2867 | if (rc) |
2868 | goto error; | |
2869 | ||
2870 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2871 | rdata->nr_pages = npages; |
1c892549 JL |
2872 | rdata->offset = offset; |
2873 | rdata->bytes = cur_len; | |
2874 | rdata->pid = pid; | |
8321fec4 JL |
2875 | rdata->pagesz = PAGE_SIZE; |
2876 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2877 | |
2878 | rc = cifs_retry_async_readv(rdata); | |
2879 | error: | |
2880 | if (rc) { | |
2881 | kref_put(&rdata->refcount, | |
2882 | cifs_uncached_readdata_release); | |
2883 | break; | |
2884 | } | |
2885 | ||
2886 | list_add_tail(&rdata->list, &rdata_list); | |
2887 | offset += cur_len; | |
2888 | len -= cur_len; | |
2889 | } while (len > 0); | |
2890 | ||
2891 | /* if at least one read request send succeeded, then reset rc */ | |
2892 | if (!list_empty(&rdata_list)) | |
2893 | rc = 0; | |
2894 | ||
2895 | /* the loop below should proceed in the order of increasing offsets */ | |
2896 | restart_loop: | |
2897 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2898 | if (!rc) { | |
2899 | ssize_t copied; | |
2900 | ||
2901 | /* FIXME: freezable sleep too? */ | |
2902 | rc = wait_for_completion_killable(&rdata->done); | |
2903 | if (rc) | |
2904 | rc = -EINTR; | |
2905 | else if (rdata->result) | |
2906 | rc = rdata->result; | |
2907 | else { | |
2908 | rc = cifs_readdata_to_iov(rdata, iov, | |
2909 | nr_segs, *poffset, | |
2910 | &copied); | |
2911 | total_read += copied; | |
2912 | } | |
2913 | ||
2914 | /* resend call if it's a retryable error */ | |
2915 | if (rc == -EAGAIN) { | |
2916 | rc = cifs_retry_async_readv(rdata); | |
2917 | goto restart_loop; | |
1da177e4 | 2918 | } |
1da177e4 | 2919 | } |
1c892549 JL |
2920 | list_del_init(&rdata->list); |
2921 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2922 | } |
a70307ee | 2923 | |
1c892549 JL |
2924 | cifs_stats_bytes_read(tcon, total_read); |
2925 | *poffset += total_read; | |
2926 | ||
09a4707e PS |
2927 | /* mask nodata case */ |
2928 | if (rc == -ENODATA) | |
2929 | rc = 0; | |
2930 | ||
1c892549 | 2931 | return total_read ? total_read : rc; |
1da177e4 LT |
2932 | } |
2933 | ||
0b81c1c4 | 2934 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2935 | unsigned long nr_segs, loff_t pos) |
2936 | { | |
2937 | ssize_t read; | |
2938 | ||
2939 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2940 | if (read > 0) | |
2941 | iocb->ki_pos = pos; | |
2942 | ||
2943 | return read; | |
2944 | } | |
2945 | ||
579f9053 PS |
2946 | ssize_t |
2947 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2948 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2949 | { |
496ad9aa | 2950 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2951 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2952 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2953 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2954 | iocb->ki_filp->private_data; | |
2955 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2956 | int rc = -EACCES; | |
a70307ee PS |
2957 | |
2958 | /* | |
2959 | * In strict cache mode we need to read from the server all the time | |
2960 | * if we don't have level II oplock because the server can delay mtime | |
2961 | * change - so we can't make a decision about inode invalidating. | |
2962 | * And we can also fail with pagereading if there are mandatory locks | |
2963 | * on pages affected by this read but not on the region from pos to | |
2964 | * pos+len-1. | |
2965 | */ | |
579f9053 PS |
2966 | if (!cinode->clientCanCacheRead) |
2967 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2968 | |
579f9053 PS |
2969 | if (cap_unix(tcon->ses) && |
2970 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2971 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2972 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2973 | ||
2974 | /* | |
2975 | * We need to hold the sem to be sure nobody modifies lock list | |
2976 | * with a brlock that prevents reading. | |
2977 | */ | |
2978 | down_read(&cinode->lock_sem); | |
2979 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2980 | tcon->ses->server->vals->shared_lock_type, | |
081c0414 | 2981 | NULL, CIFS_READ_OP)) |
579f9053 PS |
2982 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); |
2983 | up_read(&cinode->lock_sem); | |
2984 | return rc; | |
a70307ee | 2985 | } |
1da177e4 | 2986 | |
f9c6e234 PS |
2987 | static ssize_t |
2988 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2989 | { |
2990 | int rc = -EACCES; | |
2991 | unsigned int bytes_read = 0; | |
2992 | unsigned int total_read; | |
2993 | unsigned int current_read_size; | |
5eba8ab3 | 2994 | unsigned int rsize; |
1da177e4 | 2995 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2996 | struct cifs_tcon *tcon; |
f9c6e234 | 2997 | struct TCP_Server_Info *server; |
6d5786a3 | 2998 | unsigned int xid; |
f9c6e234 | 2999 | char *cur_offset; |
1da177e4 | 3000 | struct cifsFileInfo *open_file; |
d4ffff1f | 3001 | struct cifs_io_parms io_parms; |
ec637e3f | 3002 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 3003 | __u32 pid; |
1da177e4 | 3004 | |
6d5786a3 | 3005 | xid = get_xid(); |
e6a00296 | 3006 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 3007 | |
5eba8ab3 JL |
3008 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3009 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3010 | ||
1da177e4 | 3011 | if (file->private_data == NULL) { |
0f3bc09e | 3012 | rc = -EBADF; |
6d5786a3 | 3013 | free_xid(xid); |
0f3bc09e | 3014 | return rc; |
1da177e4 | 3015 | } |
c21dfb69 | 3016 | open_file = file->private_data; |
29e20f9c | 3017 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3018 | server = tcon->ses->server; |
3019 | ||
3020 | if (!server->ops->sync_read) { | |
3021 | free_xid(xid); | |
3022 | return -ENOSYS; | |
3023 | } | |
1da177e4 | 3024 | |
d4ffff1f PS |
3025 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3026 | pid = open_file->pid; | |
3027 | else | |
3028 | pid = current->tgid; | |
3029 | ||
1da177e4 | 3030 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3031 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3032 | |
f9c6e234 PS |
3033 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3034 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3035 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3036 | /* |
3037 | * For windows me and 9x we do not want to request more than it | |
3038 | * negotiated since it will refuse the read then. | |
3039 | */ | |
3040 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3041 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3042 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3043 | CIFSMaxBufSize); |
f9f5c817 | 3044 | } |
1da177e4 LT |
3045 | rc = -EAGAIN; |
3046 | while (rc == -EAGAIN) { | |
cdff08e7 | 3047 | if (open_file->invalidHandle) { |
15886177 | 3048 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3049 | if (rc != 0) |
3050 | break; | |
3051 | } | |
d4ffff1f | 3052 | io_parms.pid = pid; |
29e20f9c | 3053 | io_parms.tcon = tcon; |
f9c6e234 | 3054 | io_parms.offset = *offset; |
d4ffff1f | 3055 | io_parms.length = current_read_size; |
f9c6e234 PS |
3056 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3057 | &bytes_read, &cur_offset, | |
3058 | &buf_type); | |
1da177e4 LT |
3059 | } |
3060 | if (rc || (bytes_read == 0)) { | |
3061 | if (total_read) { | |
3062 | break; | |
3063 | } else { | |
6d5786a3 | 3064 | free_xid(xid); |
1da177e4 LT |
3065 | return rc; |
3066 | } | |
3067 | } else { | |
29e20f9c | 3068 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3069 | *offset += bytes_read; |
1da177e4 LT |
3070 | } |
3071 | } | |
6d5786a3 | 3072 | free_xid(xid); |
1da177e4 LT |
3073 | return total_read; |
3074 | } | |
3075 | ||
ca83ce3d JL |
3076 | /* |
3077 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3078 | * sure that it doesn't change while being written back. | |
3079 | */ | |
3080 | static int | |
3081 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3082 | { | |
3083 | struct page *page = vmf->page; | |
3084 | ||
3085 | lock_page(page); | |
3086 | return VM_FAULT_LOCKED; | |
3087 | } | |
3088 | ||
3089 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3090 | .fault = filemap_fault, | |
3091 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3092 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3093 | }; |
3094 | ||
7a6a19b1 PS |
3095 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3096 | { | |
3097 | int rc, xid; | |
496ad9aa | 3098 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3099 | |
6d5786a3 | 3100 | xid = get_xid(); |
7a6a19b1 | 3101 | |
6feb9891 PS |
3102 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3103 | rc = cifs_invalidate_mapping(inode); | |
3104 | if (rc) | |
3105 | return rc; | |
3106 | } | |
7a6a19b1 PS |
3107 | |
3108 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3109 | if (rc == 0) |
3110 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3111 | free_xid(xid); |
7a6a19b1 PS |
3112 | return rc; |
3113 | } | |
3114 | ||
1da177e4 LT |
3115 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3116 | { | |
1da177e4 LT |
3117 | int rc, xid; |
3118 | ||
6d5786a3 | 3119 | xid = get_xid(); |
abab095d | 3120 | rc = cifs_revalidate_file(file); |
1da177e4 | 3121 | if (rc) { |
f96637be JP |
3122 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3123 | rc); | |
6d5786a3 | 3124 | free_xid(xid); |
1da177e4 LT |
3125 | return rc; |
3126 | } | |
3127 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3128 | if (rc == 0) |
3129 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3130 | free_xid(xid); |
1da177e4 LT |
3131 | return rc; |
3132 | } | |
3133 | ||
0471ca3f JL |
3134 | static void |
3135 | cifs_readv_complete(struct work_struct *work) | |
3136 | { | |
c5fab6f4 | 3137 | unsigned int i; |
0471ca3f JL |
3138 | struct cifs_readdata *rdata = container_of(work, |
3139 | struct cifs_readdata, work); | |
0471ca3f | 3140 | |
c5fab6f4 JL |
3141 | for (i = 0; i < rdata->nr_pages; i++) { |
3142 | struct page *page = rdata->pages[i]; | |
3143 | ||
0471ca3f JL |
3144 | lru_cache_add_file(page); |
3145 | ||
3146 | if (rdata->result == 0) { | |
0471ca3f JL |
3147 | flush_dcache_page(page); |
3148 | SetPageUptodate(page); | |
3149 | } | |
3150 | ||
3151 | unlock_page(page); | |
3152 | ||
3153 | if (rdata->result == 0) | |
3154 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3155 | ||
3156 | page_cache_release(page); | |
c5fab6f4 | 3157 | rdata->pages[i] = NULL; |
0471ca3f | 3158 | } |
6993f74a | 3159 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3160 | } |
3161 | ||
8d5ce4d2 | 3162 | static int |
8321fec4 JL |
3163 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3164 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3165 | { |
8321fec4 | 3166 | int total_read = 0, result = 0; |
c5fab6f4 | 3167 | unsigned int i; |
8d5ce4d2 JL |
3168 | u64 eof; |
3169 | pgoff_t eof_index; | |
c5fab6f4 | 3170 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3171 | struct kvec iov; |
8d5ce4d2 JL |
3172 | |
3173 | /* determine the eof that the server (probably) has */ | |
3174 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3175 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
f96637be | 3176 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3177 | |
8321fec4 | 3178 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3179 | for (i = 0; i < nr_pages; i++) { |
3180 | struct page *page = rdata->pages[i]; | |
3181 | ||
8321fec4 | 3182 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3183 | /* enough data to fill the page */ |
8321fec4 JL |
3184 | iov.iov_base = kmap(page); |
3185 | iov.iov_len = PAGE_CACHE_SIZE; | |
f96637be JP |
3186 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3187 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3188 | len -= PAGE_CACHE_SIZE; |
3189 | } else if (len > 0) { | |
8d5ce4d2 | 3190 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3191 | iov.iov_base = kmap(page); |
3192 | iov.iov_len = len; | |
f96637be JP |
3193 | cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n", |
3194 | i, page->index, iov.iov_base, iov.iov_len); | |
8321fec4 JL |
3195 | memset(iov.iov_base + len, |
3196 | '\0', PAGE_CACHE_SIZE - len); | |
3197 | rdata->tailsz = len; | |
3198 | len = 0; | |
8d5ce4d2 JL |
3199 | } else if (page->index > eof_index) { |
3200 | /* | |
3201 | * The VFS will not try to do readahead past the | |
3202 | * i_size, but it's possible that we have outstanding | |
3203 | * writes with gaps in the middle and the i_size hasn't | |
3204 | * caught up yet. Populate those with zeroed out pages | |
3205 | * to prevent the VFS from repeatedly attempting to | |
3206 | * fill them until the writes are flushed. | |
3207 | */ | |
3208 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3209 | lru_cache_add_file(page); |
3210 | flush_dcache_page(page); | |
3211 | SetPageUptodate(page); | |
3212 | unlock_page(page); | |
3213 | page_cache_release(page); | |
c5fab6f4 JL |
3214 | rdata->pages[i] = NULL; |
3215 | rdata->nr_pages--; | |
8321fec4 | 3216 | continue; |
8d5ce4d2 JL |
3217 | } else { |
3218 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3219 | lru_cache_add_file(page); |
3220 | unlock_page(page); | |
3221 | page_cache_release(page); | |
c5fab6f4 JL |
3222 | rdata->pages[i] = NULL; |
3223 | rdata->nr_pages--; | |
8321fec4 | 3224 | continue; |
8d5ce4d2 | 3225 | } |
8321fec4 JL |
3226 | |
3227 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3228 | kunmap(page); | |
3229 | if (result < 0) | |
3230 | break; | |
3231 | ||
3232 | total_read += result; | |
8d5ce4d2 JL |
3233 | } |
3234 | ||
8f516091 | 3235 | return total_read > 0 && result != -EAGAIN ? total_read : result; |
8d5ce4d2 JL |
3236 | } |
3237 | ||
1da177e4 LT |
3238 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3239 | struct list_head *page_list, unsigned num_pages) | |
3240 | { | |
690c5e31 JL |
3241 | int rc; |
3242 | struct list_head tmplist; | |
3243 | struct cifsFileInfo *open_file = file->private_data; | |
3244 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3245 | unsigned int rsize = cifs_sb->rsize; | |
3246 | pid_t pid; | |
1da177e4 | 3247 | |
690c5e31 JL |
3248 | /* |
3249 | * Give up immediately if rsize is too small to read an entire page. | |
3250 | * The VFS will fall back to readpage. We should never reach this | |
3251 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3252 | * than a cache page. | |
3253 | */ | |
3254 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3255 | return 0; | |
bfa0d75a | 3256 | |
56698236 SJ |
3257 | /* |
3258 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3259 | * immediately if the cookie is negative | |
3260 | */ | |
3261 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3262 | &num_pages); | |
3263 | if (rc == 0) | |
690c5e31 | 3264 | return rc; |
56698236 | 3265 | |
d4ffff1f PS |
3266 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3267 | pid = open_file->pid; | |
3268 | else | |
3269 | pid = current->tgid; | |
3270 | ||
690c5e31 JL |
3271 | rc = 0; |
3272 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3273 | |
f96637be JP |
3274 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3275 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3276 | |
3277 | /* | |
3278 | * Start with the page at end of list and move it to private | |
3279 | * list. Do the same with any following pages until we hit | |
3280 | * the rsize limit, hit an index discontinuity, or run out of | |
3281 | * pages. Issue the async read and then start the loop again | |
3282 | * until the list is empty. | |
3283 | * | |
3284 | * Note that list order is important. The page_list is in | |
3285 | * the order of declining indexes. When we put the pages in | |
3286 | * the rdata->pages, then we want them in increasing order. | |
3287 | */ | |
3288 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3289 | unsigned int i; |
690c5e31 JL |
3290 | unsigned int bytes = PAGE_CACHE_SIZE; |
3291 | unsigned int expected_index; | |
3292 | unsigned int nr_pages = 1; | |
3293 | loff_t offset; | |
3294 | struct page *page, *tpage; | |
3295 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3296 | |
3297 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3298 | |
3299 | /* | |
3300 | * Lock the page and put it in the cache. Since no one else | |
3301 | * should have access to this page, we're safe to simply set | |
3302 | * PG_locked without checking it first. | |
3303 | */ | |
3304 | __set_page_locked(page); | |
3305 | rc = add_to_page_cache_locked(page, mapping, | |
3306 | page->index, GFP_KERNEL); | |
3307 | ||
3308 | /* give up if we can't stick it in the cache */ | |
3309 | if (rc) { | |
3310 | __clear_page_locked(page); | |
3311 | break; | |
3312 | } | |
3313 | ||
3314 | /* move first page to the tmplist */ | |
1da177e4 | 3315 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3316 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3317 | |
690c5e31 JL |
3318 | /* now try and add more pages onto the request */ |
3319 | expected_index = page->index + 1; | |
3320 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3321 | /* discontinuity ? */ | |
3322 | if (page->index != expected_index) | |
fb8c4b14 | 3323 | break; |
690c5e31 JL |
3324 | |
3325 | /* would this page push the read over the rsize? */ | |
3326 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3327 | break; | |
3328 | ||
3329 | __set_page_locked(page); | |
3330 | if (add_to_page_cache_locked(page, mapping, | |
3331 | page->index, GFP_KERNEL)) { | |
3332 | __clear_page_locked(page); | |
3333 | break; | |
3334 | } | |
3335 | list_move_tail(&page->lru, &tmplist); | |
3336 | bytes += PAGE_CACHE_SIZE; | |
3337 | expected_index++; | |
3338 | nr_pages++; | |
1da177e4 | 3339 | } |
690c5e31 | 3340 | |
0471ca3f | 3341 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3342 | if (!rdata) { |
3343 | /* best to give up if we're out of mem */ | |
3344 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3345 | list_del(&page->lru); | |
3346 | lru_cache_add_file(page); | |
3347 | unlock_page(page); | |
3348 | page_cache_release(page); | |
3349 | } | |
3350 | rc = -ENOMEM; | |
3351 | break; | |
3352 | } | |
3353 | ||
6993f74a | 3354 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3355 | rdata->mapping = mapping; |
3356 | rdata->offset = offset; | |
3357 | rdata->bytes = bytes; | |
3358 | rdata->pid = pid; | |
8321fec4 JL |
3359 | rdata->pagesz = PAGE_CACHE_SIZE; |
3360 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3361 | |
3362 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3363 | list_del(&page->lru); | |
3364 | rdata->pages[rdata->nr_pages++] = page; | |
3365 | } | |
690c5e31 | 3366 | |
2a1bb138 | 3367 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3368 | if (rc != 0) { |
c5fab6f4 JL |
3369 | for (i = 0; i < rdata->nr_pages; i++) { |
3370 | page = rdata->pages[i]; | |
690c5e31 JL |
3371 | lru_cache_add_file(page); |
3372 | unlock_page(page); | |
3373 | page_cache_release(page); | |
1da177e4 | 3374 | } |
6993f74a | 3375 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3376 | break; |
3377 | } | |
6993f74a JL |
3378 | |
3379 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3380 | } |
3381 | ||
1da177e4 LT |
3382 | return rc; |
3383 | } | |
3384 | ||
3385 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3386 | loff_t *poffset) | |
3387 | { | |
3388 | char *read_data; | |
3389 | int rc; | |
3390 | ||
56698236 | 3391 | /* Is the page cached? */ |
496ad9aa | 3392 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3393 | if (rc == 0) |
3394 | goto read_complete; | |
3395 | ||
1da177e4 LT |
3396 | page_cache_get(page); |
3397 | read_data = kmap(page); | |
3398 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3399 | |
1da177e4 | 3400 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3401 | |
1da177e4 LT |
3402 | if (rc < 0) |
3403 | goto io_error; | |
3404 | else | |
f96637be | 3405 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3406 | |
496ad9aa AV |
3407 | file_inode(file)->i_atime = |
3408 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3409 | |
1da177e4 LT |
3410 | if (PAGE_CACHE_SIZE > rc) |
3411 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3412 | ||
3413 | flush_dcache_page(page); | |
3414 | SetPageUptodate(page); | |
9dc06558 SJ |
3415 | |
3416 | /* send this page to the cache */ | |
496ad9aa | 3417 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3418 | |
1da177e4 | 3419 | rc = 0; |
fb8c4b14 | 3420 | |
1da177e4 | 3421 | io_error: |
fb8c4b14 | 3422 | kunmap(page); |
1da177e4 | 3423 | page_cache_release(page); |
56698236 SJ |
3424 | |
3425 | read_complete: | |
1da177e4 LT |
3426 | return rc; |
3427 | } | |
3428 | ||
3429 | static int cifs_readpage(struct file *file, struct page *page) | |
3430 | { | |
3431 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3432 | int rc = -EACCES; | |
6d5786a3 | 3433 | unsigned int xid; |
1da177e4 | 3434 | |
6d5786a3 | 3435 | xid = get_xid(); |
1da177e4 LT |
3436 | |
3437 | if (file->private_data == NULL) { | |
0f3bc09e | 3438 | rc = -EBADF; |
6d5786a3 | 3439 | free_xid(xid); |
0f3bc09e | 3440 | return rc; |
1da177e4 LT |
3441 | } |
3442 | ||
f96637be | 3443 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3444 | page, (int)offset, (int)offset); |
1da177e4 LT |
3445 | |
3446 | rc = cifs_readpage_worker(file, page, &offset); | |
3447 | ||
3448 | unlock_page(page); | |
3449 | ||
6d5786a3 | 3450 | free_xid(xid); |
1da177e4 LT |
3451 | return rc; |
3452 | } | |
3453 | ||
a403a0a3 SF |
3454 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3455 | { | |
3456 | struct cifsFileInfo *open_file; | |
3457 | ||
4477288a | 3458 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3459 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3460 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3461 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3462 | return 1; |
3463 | } | |
3464 | } | |
4477288a | 3465 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3466 | return 0; |
3467 | } | |
3468 | ||
1da177e4 LT |
3469 | /* We do not want to update the file size from server for inodes |
3470 | open for write - to avoid races with writepage extending | |
3471 | the file - in the future we could consider allowing | |
fb8c4b14 | 3472 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3473 | but this is tricky to do without racing with writebehind |
3474 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3475 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3476 | { |
a403a0a3 | 3477 | if (!cifsInode) |
4b18f2a9 | 3478 | return true; |
50c2f753 | 3479 | |
a403a0a3 SF |
3480 | if (is_inode_writable(cifsInode)) { |
3481 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3482 | struct cifs_sb_info *cifs_sb; |
3483 | ||
c32a0b68 | 3484 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3485 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3486 | /* since no page cache to corrupt on directio |
c32a0b68 | 3487 | we can change size safely */ |
4b18f2a9 | 3488 | return true; |
c32a0b68 SF |
3489 | } |
3490 | ||
fb8c4b14 | 3491 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3492 | return true; |
7ba52631 | 3493 | |
4b18f2a9 | 3494 | return false; |
23e7dd7d | 3495 | } else |
4b18f2a9 | 3496 | return true; |
1da177e4 LT |
3497 | } |
3498 | ||
d9414774 NP |
3499 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3500 | loff_t pos, unsigned len, unsigned flags, | |
3501 | struct page **pagep, void **fsdata) | |
1da177e4 | 3502 | { |
d9414774 NP |
3503 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3504 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3505 | loff_t page_start = pos & PAGE_MASK; |
3506 | loff_t i_size; | |
3507 | struct page *page; | |
3508 | int rc = 0; | |
d9414774 | 3509 | |
f96637be | 3510 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3511 | |
54566b2c | 3512 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3513 | if (!page) { |
3514 | rc = -ENOMEM; | |
3515 | goto out; | |
3516 | } | |
8a236264 | 3517 | |
a98ee8c1 JL |
3518 | if (PageUptodate(page)) |
3519 | goto out; | |
8a236264 | 3520 | |
a98ee8c1 JL |
3521 | /* |
3522 | * If we write a full page it will be up to date, no need to read from | |
3523 | * the server. If the write is short, we'll end up doing a sync write | |
3524 | * instead. | |
3525 | */ | |
3526 | if (len == PAGE_CACHE_SIZE) | |
3527 | goto out; | |
8a236264 | 3528 | |
a98ee8c1 JL |
3529 | /* |
3530 | * optimize away the read when we have an oplock, and we're not | |
3531 | * expecting to use any of the data we'd be reading in. That | |
3532 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3533 | * and the write will cover all of the existing data. | |
3534 | */ | |
3535 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3536 | i_size = i_size_read(mapping->host); | |
3537 | if (page_start >= i_size || | |
3538 | (offset == 0 && (pos + len) >= i_size)) { | |
3539 | zero_user_segments(page, 0, offset, | |
3540 | offset + len, | |
3541 | PAGE_CACHE_SIZE); | |
3542 | /* | |
3543 | * PageChecked means that the parts of the page | |
3544 | * to which we're not writing are considered up | |
3545 | * to date. Once the data is copied to the | |
3546 | * page, it can be set uptodate. | |
3547 | */ | |
3548 | SetPageChecked(page); | |
3549 | goto out; | |
3550 | } | |
3551 | } | |
d9414774 | 3552 | |
a98ee8c1 JL |
3553 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3554 | /* | |
3555 | * might as well read a page, it is fast enough. If we get | |
3556 | * an error, we don't need to return it. cifs_write_end will | |
3557 | * do a sync write instead since PG_uptodate isn't set. | |
3558 | */ | |
3559 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3560 | } else { |
3561 | /* we could try using another file handle if there is one - | |
3562 | but how would we lock it to prevent close of that handle | |
3563 | racing with this read? In any case | |
d9414774 | 3564 | this will be written out by write_end so is fine */ |
1da177e4 | 3565 | } |
a98ee8c1 JL |
3566 | out: |
3567 | *pagep = page; | |
3568 | return rc; | |
1da177e4 LT |
3569 | } |
3570 | ||
85f2d6b4 SJ |
3571 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3572 | { | |
3573 | if (PagePrivate(page)) | |
3574 | return 0; | |
3575 | ||
3576 | return cifs_fscache_release_page(page, gfp); | |
3577 | } | |
3578 | ||
3579 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3580 | { | |
3581 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3582 | ||
3583 | if (offset == 0) | |
3584 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3585 | } | |
3586 | ||
9ad1506b PS |
3587 | static int cifs_launder_page(struct page *page) |
3588 | { | |
3589 | int rc = 0; | |
3590 | loff_t range_start = page_offset(page); | |
3591 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3592 | struct writeback_control wbc = { | |
3593 | .sync_mode = WB_SYNC_ALL, | |
3594 | .nr_to_write = 0, | |
3595 | .range_start = range_start, | |
3596 | .range_end = range_end, | |
3597 | }; | |
3598 | ||
f96637be | 3599 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
3600 | |
3601 | if (clear_page_dirty_for_io(page)) | |
3602 | rc = cifs_writepage_locked(page, &wbc); | |
3603 | ||
3604 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3605 | return rc; | |
3606 | } | |
3607 | ||
9b646972 | 3608 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3609 | { |
3610 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3611 | oplock_break); | |
a5e18bc3 | 3612 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3613 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3614 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3615 | int rc = 0; |
3bc303c2 | 3616 | |
63b7d3a4 PS |
3617 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead && |
3618 | cifs_has_mand_locks(cinode)) { | |
f96637be JP |
3619 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
3620 | inode); | |
63b7d3a4 PS |
3621 | cinode->clientCanCacheRead = false; |
3622 | } | |
3623 | ||
3bc303c2 | 3624 | if (inode && S_ISREG(inode->i_mode)) { |
d54ff732 | 3625 | if (cinode->clientCanCacheRead) |
8737c930 | 3626 | break_lease(inode, O_RDONLY); |
d54ff732 | 3627 | else |
8737c930 | 3628 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3629 | rc = filemap_fdatawrite(inode->i_mapping); |
3630 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3631 | rc = filemap_fdatawait(inode->i_mapping); |
3632 | mapping_set_error(inode->i_mapping, rc); | |
03eca704 | 3633 | cifs_invalidate_mapping(inode); |
3bc303c2 | 3634 | } |
f96637be | 3635 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
3636 | } |
3637 | ||
85160e03 PS |
3638 | rc = cifs_push_locks(cfile); |
3639 | if (rc) | |
f96637be | 3640 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 3641 | |
3bc303c2 JL |
3642 | /* |
3643 | * releasing stale oplock after recent reconnect of smb session using | |
3644 | * a now incorrect file handle is not a data integrity issue but do | |
3645 | * not bother sending an oplock release if session to server still is | |
3646 | * disconnected since oplock already released by the server | |
3647 | */ | |
cdff08e7 | 3648 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3649 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3650 | cinode); | |
f96637be | 3651 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 3652 | } |
3bc303c2 JL |
3653 | } |
3654 | ||
f5e54d6e | 3655 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3656 | .readpage = cifs_readpage, |
3657 | .readpages = cifs_readpages, | |
3658 | .writepage = cifs_writepage, | |
37c0eb46 | 3659 | .writepages = cifs_writepages, |
d9414774 NP |
3660 | .write_begin = cifs_write_begin, |
3661 | .write_end = cifs_write_end, | |
1da177e4 | 3662 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3663 | .releasepage = cifs_release_page, |
3664 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3665 | .launder_page = cifs_launder_page, |
1da177e4 | 3666 | }; |
273d81d6 DK |
3667 | |
3668 | /* | |
3669 | * cifs_readpages requires the server to support a buffer large enough to | |
3670 | * contain the header plus one complete page of data. Otherwise, we need | |
3671 | * to leave cifs_readpages out of the address space operations. | |
3672 | */ | |
f5e54d6e | 3673 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3674 | .readpage = cifs_readpage, |
3675 | .writepage = cifs_writepage, | |
3676 | .writepages = cifs_writepages, | |
d9414774 NP |
3677 | .write_begin = cifs_write_begin, |
3678 | .write_end = cifs_write_end, | |
273d81d6 | 3679 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3680 | .releasepage = cifs_release_page, |
3681 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3682 | .launder_page = cifs_launder_page, |
273d81d6 | 3683 | }; |