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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | static inline int cifs_convert_flags(unsigned int flags) |
47 | { | |
48 | if ((flags & O_ACCMODE) == O_RDONLY) | |
49 | return GENERIC_READ; | |
50 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
51 | return GENERIC_WRITE; | |
52 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
53 | /* GENERIC_ALL is too much permission to request | |
54 | can cause unnecessary access denied on create */ | |
55 | /* return GENERIC_ALL; */ | |
56 | return (GENERIC_READ | GENERIC_WRITE); | |
57 | } | |
58 | ||
e10f7b55 JL |
59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
61 | FILE_READ_DATA); | |
7fc8f4e9 | 62 | } |
e10f7b55 | 63 | |
608712fe | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 65 | { |
608712fe | 66 | u32 posix_flags = 0; |
e10f7b55 | 67 | |
7fc8f4e9 | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 69 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
71 | posix_flags = SMB_O_WRONLY; |
72 | else if ((flags & O_ACCMODE) == O_RDWR) | |
73 | posix_flags = SMB_O_RDWR; | |
74 | ||
75 | if (flags & O_CREAT) | |
76 | posix_flags |= SMB_O_CREAT; | |
77 | if (flags & O_EXCL) | |
78 | posix_flags |= SMB_O_EXCL; | |
79 | if (flags & O_TRUNC) | |
80 | posix_flags |= SMB_O_TRUNC; | |
81 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 82 | if (flags & O_DSYNC) |
608712fe | 83 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 84 | if (flags & O_DIRECTORY) |
608712fe | 85 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 86 | if (flags & O_NOFOLLOW) |
608712fe | 87 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 88 | if (flags & O_DIRECT) |
608712fe | 89 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
90 | |
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
608712fe JL |
108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
109 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 110 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
111 | { |
112 | int rc; | |
113 | FILE_UNIX_BASIC_INFO *presp_data; | |
114 | __u32 posix_flags = 0; | |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
116 | struct cifs_fattr fattr; | |
117 | struct tcon_link *tlink; | |
96daf2b0 | 118 | struct cifs_tcon *tcon; |
608712fe JL |
119 | |
120 | cFYI(1, "posix open %s", full_path); | |
121 | ||
122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
123 | if (presp_data == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | tlink = cifs_sb_tlink(cifs_sb); | |
127 | if (IS_ERR(tlink)) { | |
128 | rc = PTR_ERR(tlink); | |
129 | goto posix_open_ret; | |
130 | } | |
131 | ||
132 | tcon = tlink_tcon(tlink); | |
133 | mode &= ~current_umask(); | |
134 | ||
135 | posix_flags = cifs_posix_convert_flags(f_flags); | |
136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
137 | poplock, full_path, cifs_sb->local_nls, | |
138 | cifs_sb->mnt_cifs_flags & | |
139 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
140 | cifs_put_tlink(tlink); | |
141 | ||
142 | if (rc) | |
143 | goto posix_open_ret; | |
144 | ||
145 | if (presp_data->Type == cpu_to_le32(-1)) | |
146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
147 | ||
148 | if (!pinode) | |
149 | goto posix_open_ret; /* caller does not need info */ | |
150 | ||
151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
152 | ||
153 | /* get new inode and set it up */ | |
154 | if (*pinode == NULL) { | |
155 | cifs_fill_uniqueid(sb, &fattr); | |
156 | *pinode = cifs_iget(sb, &fattr); | |
157 | if (!*pinode) { | |
158 | rc = -ENOMEM; | |
159 | goto posix_open_ret; | |
160 | } | |
161 | } else { | |
162 | cifs_fattr_to_inode(*pinode, &fattr); | |
163 | } | |
164 | ||
165 | posix_open_ret: | |
166 | kfree(presp_data); | |
167 | return rc; | |
168 | } | |
169 | ||
eeb910a6 PS |
170 | static int |
171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
173 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
174 | { |
175 | int rc; | |
fb1214e4 | 176 | int desired_access; |
eeb910a6 | 177 | int disposition; |
3d3ea8e6 | 178 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 179 | FILE_ALL_INFO *buf; |
b8c32dbb | 180 | struct TCP_Server_Info *server = tcon->ses->server; |
eeb910a6 | 181 | |
b8c32dbb | 182 | if (!server->ops->open) |
fb1214e4 PS |
183 | return -ENOSYS; |
184 | ||
185 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
186 | |
187 | /********************************************************************* | |
188 | * open flag mapping table: | |
189 | * | |
190 | * POSIX Flag CIFS Disposition | |
191 | * ---------- ---------------- | |
192 | * O_CREAT FILE_OPEN_IF | |
193 | * O_CREAT | O_EXCL FILE_CREATE | |
194 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
195 | * O_TRUNC FILE_OVERWRITE | |
196 | * none of the above FILE_OPEN | |
197 | * | |
198 | * Note that there is not a direct match between disposition | |
199 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
200 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
201 | * file rather than creating a new file as FILE_SUPERSEDE does | |
202 | * (which uses the attributes / metadata passed in on open call) | |
203 | *? | |
204 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
205 | *? and the read write flags match reasonably. O_LARGEFILE | |
206 | *? is irrelevant because largefile support is always used | |
207 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
208 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
209 | *********************************************************************/ | |
210 | ||
211 | disposition = cifs_get_disposition(f_flags); | |
212 | ||
213 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
214 | ||
215 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
216 | if (!buf) | |
217 | return -ENOMEM; | |
218 | ||
3d3ea8e6 SP |
219 | if (backup_cred(cifs_sb)) |
220 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
221 | ||
b8c32dbb PS |
222 | rc = server->ops->open(xid, tcon, full_path, disposition, |
223 | desired_access, create_options, fid, oplock, buf, | |
224 | cifs_sb); | |
eeb910a6 PS |
225 | |
226 | if (rc) | |
227 | goto out; | |
228 | ||
229 | if (tcon->unix_ext) | |
230 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
231 | xid); | |
232 | else | |
233 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 234 | xid, &fid->netfid); |
eeb910a6 PS |
235 | |
236 | out: | |
237 | kfree(buf); | |
238 | return rc; | |
239 | } | |
240 | ||
63b7d3a4 PS |
241 | static bool |
242 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
243 | { | |
244 | struct cifs_fid_locks *cur; | |
245 | bool has_locks = false; | |
246 | ||
247 | down_read(&cinode->lock_sem); | |
248 | list_for_each_entry(cur, &cinode->llist, llist) { | |
249 | if (!list_empty(&cur->locks)) { | |
250 | has_locks = true; | |
251 | break; | |
252 | } | |
253 | } | |
254 | up_read(&cinode->lock_sem); | |
255 | return has_locks; | |
256 | } | |
257 | ||
15ecb436 | 258 | struct cifsFileInfo * |
fb1214e4 | 259 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
260 | struct tcon_link *tlink, __u32 oplock) |
261 | { | |
262 | struct dentry *dentry = file->f_path.dentry; | |
263 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
264 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
265 | struct cifsFileInfo *cfile; | |
f45d3416 | 266 | struct cifs_fid_locks *fdlocks; |
233839b1 | 267 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 268 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
269 | |
270 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
271 | if (cfile == NULL) | |
272 | return cfile; | |
273 | ||
f45d3416 PS |
274 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
275 | if (!fdlocks) { | |
276 | kfree(cfile); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | INIT_LIST_HEAD(&fdlocks->locks); | |
281 | fdlocks->cfile = cfile; | |
282 | cfile->llist = fdlocks; | |
1b4b55a1 | 283 | down_write(&cinode->lock_sem); |
f45d3416 | 284 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 285 | up_write(&cinode->lock_sem); |
f45d3416 | 286 | |
4b4de76e | 287 | cfile->count = 1; |
4b4de76e PS |
288 | cfile->pid = current->tgid; |
289 | cfile->uid = current_fsuid(); | |
290 | cfile->dentry = dget(dentry); | |
291 | cfile->f_flags = file->f_flags; | |
292 | cfile->invalidHandle = false; | |
293 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 294 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 295 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 296 | |
63b7d3a4 PS |
297 | /* |
298 | * If the server returned a read oplock and we have mandatory brlocks, | |
299 | * set oplock level to None. | |
300 | */ | |
301 | if (oplock == server->vals->oplock_read && | |
302 | cifs_has_mand_locks(cinode)) { | |
303 | cFYI(1, "Reset oplock val from read to None due to mand locks"); | |
304 | oplock = 0; | |
305 | } | |
306 | ||
4477288a | 307 | spin_lock(&cifs_file_list_lock); |
63b7d3a4 | 308 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
309 | oplock = fid->pending_open->oplock; |
310 | list_del(&fid->pending_open->olist); | |
311 | ||
63b7d3a4 | 312 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
313 | |
314 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
315 | /* if readable file instance put first in list*/ |
316 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 317 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 318 | else |
4b4de76e | 319 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 320 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 321 | |
4b4de76e PS |
322 | file->private_data = cfile; |
323 | return cfile; | |
15ecb436 JL |
324 | } |
325 | ||
764a1b1a JL |
326 | struct cifsFileInfo * |
327 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
328 | { | |
329 | spin_lock(&cifs_file_list_lock); | |
330 | cifsFileInfo_get_locked(cifs_file); | |
331 | spin_unlock(&cifs_file_list_lock); | |
332 | return cifs_file; | |
333 | } | |
334 | ||
cdff08e7 SF |
335 | /* |
336 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
337 | * the filehandle out on the server. Must be called without holding |
338 | * cifs_file_list_lock. | |
cdff08e7 | 339 | */ |
b33879aa JL |
340 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
341 | { | |
e66673e3 | 342 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 343 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 344 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 345 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 346 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 | 347 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
348 | struct cifs_fid fid; |
349 | struct cifs_pending_open open; | |
cdff08e7 SF |
350 | |
351 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 352 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
353 | spin_unlock(&cifs_file_list_lock); |
354 | return; | |
355 | } | |
356 | ||
233839b1 PS |
357 | if (server->ops->get_lease_key) |
358 | server->ops->get_lease_key(inode, &fid); | |
359 | ||
360 | /* store open in pending opens to make sure we don't miss lease break */ | |
361 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
362 | ||
cdff08e7 SF |
363 | /* remove it from the lists */ |
364 | list_del(&cifs_file->flist); | |
365 | list_del(&cifs_file->tlist); | |
366 | ||
367 | if (list_empty(&cifsi->openFileList)) { | |
368 | cFYI(1, "closing last open instance for inode %p", | |
369 | cifs_file->dentry->d_inode); | |
25364138 PS |
370 | /* |
371 | * In strict cache mode we need invalidate mapping on the last | |
372 | * close because it may cause a error when we open this file | |
373 | * again and get at least level II oplock. | |
374 | */ | |
4f8ba8a0 PS |
375 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
376 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 377 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
378 | } |
379 | spin_unlock(&cifs_file_list_lock); | |
380 | ||
ad635942 JL |
381 | cancel_work_sync(&cifs_file->oplock_break); |
382 | ||
cdff08e7 | 383 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 384 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 385 | unsigned int xid; |
0ff78a22 | 386 | |
6d5786a3 | 387 | xid = get_xid(); |
0ff78a22 | 388 | if (server->ops->close) |
760ad0ca PS |
389 | server->ops->close(xid, tcon, &cifs_file->fid); |
390 | _free_xid(xid); | |
cdff08e7 SF |
391 | } |
392 | ||
233839b1 PS |
393 | cifs_del_pending_open(&open); |
394 | ||
f45d3416 PS |
395 | /* |
396 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
397 | * is closed anyway. |
398 | */ | |
1b4b55a1 | 399 | down_write(&cifsi->lock_sem); |
f45d3416 | 400 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 401 | list_del(&li->llist); |
85160e03 | 402 | cifs_del_lock_waiters(li); |
cdff08e7 | 403 | kfree(li); |
b33879aa | 404 | } |
f45d3416 PS |
405 | list_del(&cifs_file->llist->llist); |
406 | kfree(cifs_file->llist); | |
1b4b55a1 | 407 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
408 | |
409 | cifs_put_tlink(cifs_file->tlink); | |
410 | dput(cifs_file->dentry); | |
411 | kfree(cifs_file); | |
b33879aa JL |
412 | } |
413 | ||
1da177e4 | 414 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 415 | |
1da177e4 LT |
416 | { |
417 | int rc = -EACCES; | |
6d5786a3 | 418 | unsigned int xid; |
590a3fe0 | 419 | __u32 oplock; |
1da177e4 | 420 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 421 | struct TCP_Server_Info *server; |
96daf2b0 | 422 | struct cifs_tcon *tcon; |
7ffec372 | 423 | struct tcon_link *tlink; |
fb1214e4 | 424 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 425 | char *full_path = NULL; |
7e12eddb | 426 | bool posix_open_ok = false; |
fb1214e4 | 427 | struct cifs_fid fid; |
233839b1 | 428 | struct cifs_pending_open open; |
1da177e4 | 429 | |
6d5786a3 | 430 | xid = get_xid(); |
1da177e4 LT |
431 | |
432 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
433 | tlink = cifs_sb_tlink(cifs_sb); |
434 | if (IS_ERR(tlink)) { | |
6d5786a3 | 435 | free_xid(xid); |
7ffec372 JL |
436 | return PTR_ERR(tlink); |
437 | } | |
438 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 439 | server = tcon->ses->server; |
1da177e4 | 440 | |
e6a00296 | 441 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 442 | if (full_path == NULL) { |
0f3bc09e | 443 | rc = -ENOMEM; |
232341ba | 444 | goto out; |
1da177e4 LT |
445 | } |
446 | ||
b6b38f70 JP |
447 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
448 | inode, file->f_flags, full_path); | |
276a74a4 | 449 | |
233839b1 | 450 | if (server->oplocks) |
276a74a4 SF |
451 | oplock = REQ_OPLOCK; |
452 | else | |
453 | oplock = 0; | |
454 | ||
64cc2c63 | 455 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
456 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
457 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 458 | /* can not refresh inode info since size could be stale */ |
2422f676 | 459 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 460 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 461 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 462 | if (rc == 0) { |
b6b38f70 | 463 | cFYI(1, "posix open succeeded"); |
7e12eddb | 464 | posix_open_ok = true; |
64cc2c63 SF |
465 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
466 | if (tcon->ses->serverNOS) | |
b6b38f70 | 467 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
468 | " unexpected error on SMB posix open" |
469 | ", disabling posix open support." | |
470 | " Check if server update available.", | |
471 | tcon->ses->serverName, | |
b6b38f70 | 472 | tcon->ses->serverNOS); |
64cc2c63 | 473 | tcon->broken_posix_open = true; |
276a74a4 SF |
474 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
475 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
476 | goto out; | |
fb1214e4 PS |
477 | /* |
478 | * Else fallthrough to retry open the old way on network i/o | |
479 | * or DFS errors. | |
480 | */ | |
276a74a4 SF |
481 | } |
482 | ||
233839b1 PS |
483 | if (server->ops->get_lease_key) |
484 | server->ops->get_lease_key(inode, &fid); | |
485 | ||
486 | cifs_add_pending_open(&fid, tlink, &open); | |
487 | ||
7e12eddb | 488 | if (!posix_open_ok) { |
b8c32dbb PS |
489 | if (server->ops->get_lease_key) |
490 | server->ops->get_lease_key(inode, &fid); | |
491 | ||
7e12eddb | 492 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 493 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
494 | if (rc) { |
495 | cifs_del_pending_open(&open); | |
7e12eddb | 496 | goto out; |
233839b1 | 497 | } |
7e12eddb | 498 | } |
47c78b7f | 499 | |
fb1214e4 PS |
500 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
501 | if (cfile == NULL) { | |
b8c32dbb PS |
502 | if (server->ops->close) |
503 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 504 | cifs_del_pending_open(&open); |
1da177e4 LT |
505 | rc = -ENOMEM; |
506 | goto out; | |
507 | } | |
1da177e4 | 508 | |
9451a9a5 SJ |
509 | cifs_fscache_set_inode_cookie(inode, file); |
510 | ||
7e12eddb | 511 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
512 | /* |
513 | * Time to set mode which we can not set earlier due to | |
514 | * problems creating new read-only files. | |
515 | */ | |
7e12eddb PS |
516 | struct cifs_unix_set_info_args args = { |
517 | .mode = inode->i_mode, | |
518 | .uid = NO_CHANGE_64, | |
519 | .gid = NO_CHANGE_64, | |
520 | .ctime = NO_CHANGE_64, | |
521 | .atime = NO_CHANGE_64, | |
522 | .mtime = NO_CHANGE_64, | |
523 | .device = 0, | |
524 | }; | |
fb1214e4 PS |
525 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
526 | cfile->pid); | |
1da177e4 LT |
527 | } |
528 | ||
529 | out: | |
1da177e4 | 530 | kfree(full_path); |
6d5786a3 | 531 | free_xid(xid); |
7ffec372 | 532 | cifs_put_tlink(tlink); |
1da177e4 LT |
533 | return rc; |
534 | } | |
535 | ||
f152fd5f PS |
536 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
537 | ||
2ae78ba8 PS |
538 | /* |
539 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 540 | * to server was lost. |
2ae78ba8 | 541 | */ |
f152fd5f PS |
542 | static int |
543 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 544 | { |
f152fd5f PS |
545 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
546 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
547 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
548 | int rc = 0; |
549 | ||
f152fd5f PS |
550 | /* we are going to update can_cache_brlcks here - need a write access */ |
551 | down_write(&cinode->lock_sem); | |
552 | if (cinode->can_cache_brlcks) { | |
553 | /* can cache locks - no need to push them */ | |
554 | up_write(&cinode->lock_sem); | |
555 | return rc; | |
556 | } | |
557 | ||
558 | if (cap_unix(tcon->ses) && | |
559 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
560 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
561 | rc = cifs_push_posix_locks(cfile); | |
562 | else | |
563 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 564 | |
f152fd5f | 565 | up_write(&cinode->lock_sem); |
1da177e4 LT |
566 | return rc; |
567 | } | |
568 | ||
2ae78ba8 PS |
569 | static int |
570 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
571 | { |
572 | int rc = -EACCES; | |
6d5786a3 | 573 | unsigned int xid; |
590a3fe0 | 574 | __u32 oplock; |
1da177e4 | 575 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 576 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
577 | struct TCP_Server_Info *server; |
578 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 579 | struct inode *inode; |
1da177e4 | 580 | char *full_path = NULL; |
2ae78ba8 | 581 | int desired_access; |
1da177e4 | 582 | int disposition = FILE_OPEN; |
3d3ea8e6 | 583 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 584 | struct cifs_fid fid; |
1da177e4 | 585 | |
6d5786a3 | 586 | xid = get_xid(); |
2ae78ba8 PS |
587 | mutex_lock(&cfile->fh_mutex); |
588 | if (!cfile->invalidHandle) { | |
589 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 590 | rc = 0; |
6d5786a3 | 591 | free_xid(xid); |
0f3bc09e | 592 | return rc; |
1da177e4 LT |
593 | } |
594 | ||
2ae78ba8 | 595 | inode = cfile->dentry->d_inode; |
1da177e4 | 596 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
597 | tcon = tlink_tcon(cfile->tlink); |
598 | server = tcon->ses->server; | |
599 | ||
600 | /* | |
601 | * Can not grab rename sem here because various ops, including those | |
602 | * that already have the rename sem can end up causing writepage to get | |
603 | * called and if the server was down that means we end up here, and we | |
604 | * can never tell if the caller already has the rename_sem. | |
605 | */ | |
606 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 607 | if (full_path == NULL) { |
3a9f462f | 608 | rc = -ENOMEM; |
2ae78ba8 | 609 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 610 | free_xid(xid); |
3a9f462f | 611 | return rc; |
1da177e4 LT |
612 | } |
613 | ||
2ae78ba8 PS |
614 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
615 | full_path); | |
1da177e4 | 616 | |
10b9b98e | 617 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
618 | oplock = REQ_OPLOCK; |
619 | else | |
4b18f2a9 | 620 | oplock = 0; |
1da177e4 | 621 | |
29e20f9c | 622 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 623 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 624 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
625 | /* |
626 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
627 | * original open. Must mask them off for a reopen. | |
628 | */ | |
2ae78ba8 | 629 | unsigned int oflags = cfile->f_flags & |
15886177 | 630 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 631 | |
2422f676 | 632 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
633 | cifs_sb->mnt_file_mode /* ignored */, |
634 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 635 | if (rc == 0) { |
b6b38f70 | 636 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
637 | goto reopen_success; |
638 | } | |
2ae78ba8 PS |
639 | /* |
640 | * fallthrough to retry open the old way on errors, especially | |
641 | * in the reconnect path it is important to retry hard | |
642 | */ | |
7fc8f4e9 SF |
643 | } |
644 | ||
2ae78ba8 | 645 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 646 | |
3d3ea8e6 SP |
647 | if (backup_cred(cifs_sb)) |
648 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
649 | ||
b8c32dbb PS |
650 | if (server->ops->get_lease_key) |
651 | server->ops->get_lease_key(inode, &fid); | |
652 | ||
2ae78ba8 PS |
653 | /* |
654 | * Can not refresh inode by passing in file_info buf to be returned by | |
655 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
656 | * file might have write behind data that needs to be flushed and server | |
657 | * version of file size can be stale. If we knew for sure that inode was | |
658 | * not dirty locally we could do this. | |
659 | */ | |
660 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
661 | desired_access, create_options, &fid, &oplock, | |
662 | NULL, cifs_sb); | |
1da177e4 | 663 | if (rc) { |
2ae78ba8 PS |
664 | mutex_unlock(&cfile->fh_mutex); |
665 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 666 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
667 | goto reopen_error_exit; |
668 | } | |
669 | ||
7fc8f4e9 | 670 | reopen_success: |
2ae78ba8 PS |
671 | cfile->invalidHandle = false; |
672 | mutex_unlock(&cfile->fh_mutex); | |
673 | cinode = CIFS_I(inode); | |
15886177 JL |
674 | |
675 | if (can_flush) { | |
676 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 677 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 678 | |
15886177 | 679 | if (tcon->unix_ext) |
2ae78ba8 PS |
680 | rc = cifs_get_inode_info_unix(&inode, full_path, |
681 | inode->i_sb, xid); | |
15886177 | 682 | else |
2ae78ba8 PS |
683 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
684 | inode->i_sb, xid, NULL); | |
685 | } | |
686 | /* | |
687 | * Else we are writing out data to server already and could deadlock if | |
688 | * we tried to flush data, and since we do not know if we have data that | |
689 | * would invalidate the current end of file on the server we can not go | |
690 | * to the server to get the new inode info. | |
691 | */ | |
692 | ||
693 | server->ops->set_fid(cfile, &fid, oplock); | |
694 | cifs_relock_file(cfile); | |
15886177 JL |
695 | |
696 | reopen_error_exit: | |
1da177e4 | 697 | kfree(full_path); |
6d5786a3 | 698 | free_xid(xid); |
1da177e4 LT |
699 | return rc; |
700 | } | |
701 | ||
702 | int cifs_close(struct inode *inode, struct file *file) | |
703 | { | |
77970693 JL |
704 | if (file->private_data != NULL) { |
705 | cifsFileInfo_put(file->private_data); | |
706 | file->private_data = NULL; | |
707 | } | |
7ee1af76 | 708 | |
cdff08e7 SF |
709 | /* return code from the ->release op is always ignored */ |
710 | return 0; | |
1da177e4 LT |
711 | } |
712 | ||
713 | int cifs_closedir(struct inode *inode, struct file *file) | |
714 | { | |
715 | int rc = 0; | |
6d5786a3 | 716 | unsigned int xid; |
4b4de76e | 717 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
718 | struct cifs_tcon *tcon; |
719 | struct TCP_Server_Info *server; | |
720 | char *buf; | |
1da177e4 | 721 | |
b6b38f70 | 722 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 723 | |
92fc65a7 PS |
724 | if (cfile == NULL) |
725 | return rc; | |
726 | ||
6d5786a3 | 727 | xid = get_xid(); |
92fc65a7 PS |
728 | tcon = tlink_tcon(cfile->tlink); |
729 | server = tcon->ses->server; | |
1da177e4 | 730 | |
92fc65a7 PS |
731 | cFYI(1, "Freeing private data in close dir"); |
732 | spin_lock(&cifs_file_list_lock); | |
733 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
734 | cfile->invalidHandle = true; | |
735 | spin_unlock(&cifs_file_list_lock); | |
736 | if (server->ops->close_dir) | |
737 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
738 | else | |
739 | rc = -ENOSYS; | |
740 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
741 | /* not much we can do if it fails anyway, ignore rc */ | |
742 | rc = 0; | |
743 | } else | |
744 | spin_unlock(&cifs_file_list_lock); | |
745 | ||
746 | buf = cfile->srch_inf.ntwrk_buf_start; | |
747 | if (buf) { | |
748 | cFYI(1, "closedir free smb buf in srch struct"); | |
749 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
750 | if (cfile->srch_inf.smallBuf) | |
751 | cifs_small_buf_release(buf); | |
752 | else | |
753 | cifs_buf_release(buf); | |
1da177e4 | 754 | } |
92fc65a7 PS |
755 | |
756 | cifs_put_tlink(cfile->tlink); | |
757 | kfree(file->private_data); | |
758 | file->private_data = NULL; | |
1da177e4 | 759 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 760 | free_xid(xid); |
1da177e4 LT |
761 | return rc; |
762 | } | |
763 | ||
85160e03 | 764 | static struct cifsLockInfo * |
fbd35aca | 765 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 766 | { |
a88b4707 | 767 | struct cifsLockInfo *lock = |
fb8c4b14 | 768 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
769 | if (!lock) |
770 | return lock; | |
771 | lock->offset = offset; | |
772 | lock->length = length; | |
773 | lock->type = type; | |
a88b4707 PS |
774 | lock->pid = current->tgid; |
775 | INIT_LIST_HEAD(&lock->blist); | |
776 | init_waitqueue_head(&lock->block_q); | |
777 | return lock; | |
85160e03 PS |
778 | } |
779 | ||
f7ba7fe6 | 780 | void |
85160e03 PS |
781 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
782 | { | |
783 | struct cifsLockInfo *li, *tmp; | |
784 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
785 | list_del_init(&li->blist); | |
786 | wake_up(&li->block_q); | |
787 | } | |
788 | } | |
789 | ||
081c0414 PS |
790 | #define CIFS_LOCK_OP 0 |
791 | #define CIFS_READ_OP 1 | |
792 | #define CIFS_WRITE_OP 2 | |
793 | ||
794 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 795 | static bool |
f45d3416 PS |
796 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
797 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 798 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 799 | { |
fbd35aca | 800 | struct cifsLockInfo *li; |
f45d3416 | 801 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 802 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 803 | |
f45d3416 | 804 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
805 | if (offset + length <= li->offset || |
806 | offset >= li->offset + li->length) | |
807 | continue; | |
081c0414 PS |
808 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
809 | server->ops->compare_fids(cfile, cur_cfile)) { | |
810 | /* shared lock prevents write op through the same fid */ | |
811 | if (!(li->type & server->vals->shared_lock_type) || | |
812 | rw_check != CIFS_WRITE_OP) | |
813 | continue; | |
814 | } | |
f45d3416 PS |
815 | if ((type & server->vals->shared_lock_type) && |
816 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
817 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 818 | continue; |
579f9053 PS |
819 | if (conf_lock) |
820 | *conf_lock = li; | |
f45d3416 | 821 | return true; |
85160e03 PS |
822 | } |
823 | return false; | |
824 | } | |
825 | ||
579f9053 | 826 | bool |
55157dfb | 827 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 828 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 829 | int rw_check) |
161ebf9f | 830 | { |
fbd35aca | 831 | bool rc = false; |
f45d3416 | 832 | struct cifs_fid_locks *cur; |
55157dfb | 833 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 834 | |
f45d3416 PS |
835 | list_for_each_entry(cur, &cinode->llist, llist) { |
836 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 837 | cfile, conf_lock, rw_check); |
fbd35aca PS |
838 | if (rc) |
839 | break; | |
840 | } | |
fbd35aca PS |
841 | |
842 | return rc; | |
161ebf9f PS |
843 | } |
844 | ||
9a5101c8 PS |
845 | /* |
846 | * Check if there is another lock that prevents us to set the lock (mandatory | |
847 | * style). If such a lock exists, update the flock structure with its | |
848 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
849 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
850 | * the server or 1 otherwise. | |
851 | */ | |
85160e03 | 852 | static int |
fbd35aca PS |
853 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
854 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
855 | { |
856 | int rc = 0; | |
857 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 858 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 859 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
860 | bool exist; |
861 | ||
1b4b55a1 | 862 | down_read(&cinode->lock_sem); |
85160e03 | 863 | |
55157dfb | 864 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 865 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
866 | if (exist) { |
867 | flock->fl_start = conf_lock->offset; | |
868 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
869 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 870 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
871 | flock->fl_type = F_RDLCK; |
872 | else | |
873 | flock->fl_type = F_WRLCK; | |
874 | } else if (!cinode->can_cache_brlcks) | |
875 | rc = 1; | |
876 | else | |
877 | flock->fl_type = F_UNLCK; | |
878 | ||
1b4b55a1 | 879 | up_read(&cinode->lock_sem); |
85160e03 PS |
880 | return rc; |
881 | } | |
882 | ||
161ebf9f | 883 | static void |
fbd35aca | 884 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 885 | { |
fbd35aca | 886 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 887 | down_write(&cinode->lock_sem); |
f45d3416 | 888 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 889 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
890 | } |
891 | ||
9a5101c8 PS |
892 | /* |
893 | * Set the byte-range lock (mandatory style). Returns: | |
894 | * 1) 0, if we set the lock and don't need to request to the server; | |
895 | * 2) 1, if no locks prevent us but we need to request to the server; | |
896 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
897 | */ | |
85160e03 | 898 | static int |
fbd35aca | 899 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 900 | bool wait) |
85160e03 | 901 | { |
161ebf9f | 902 | struct cifsLockInfo *conf_lock; |
fbd35aca | 903 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
904 | bool exist; |
905 | int rc = 0; | |
906 | ||
85160e03 PS |
907 | try_again: |
908 | exist = false; | |
1b4b55a1 | 909 | down_write(&cinode->lock_sem); |
85160e03 | 910 | |
55157dfb | 911 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 912 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 913 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 914 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 915 | up_write(&cinode->lock_sem); |
85160e03 PS |
916 | return rc; |
917 | } | |
918 | ||
919 | if (!exist) | |
920 | rc = 1; | |
921 | else if (!wait) | |
922 | rc = -EACCES; | |
923 | else { | |
924 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 925 | up_write(&cinode->lock_sem); |
85160e03 PS |
926 | rc = wait_event_interruptible(lock->block_q, |
927 | (lock->blist.prev == &lock->blist) && | |
928 | (lock->blist.next == &lock->blist)); | |
929 | if (!rc) | |
930 | goto try_again; | |
1b4b55a1 | 931 | down_write(&cinode->lock_sem); |
a88b4707 | 932 | list_del_init(&lock->blist); |
85160e03 PS |
933 | } |
934 | ||
1b4b55a1 | 935 | up_write(&cinode->lock_sem); |
85160e03 PS |
936 | return rc; |
937 | } | |
938 | ||
9a5101c8 PS |
939 | /* |
940 | * Check if there is another lock that prevents us to set the lock (posix | |
941 | * style). If such a lock exists, update the flock structure with its | |
942 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
943 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
944 | * the server or 1 otherwise. | |
945 | */ | |
85160e03 | 946 | static int |
4f6bcec9 PS |
947 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
948 | { | |
949 | int rc = 0; | |
496ad9aa | 950 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
951 | unsigned char saved_type = flock->fl_type; |
952 | ||
50792760 PS |
953 | if ((flock->fl_flags & FL_POSIX) == 0) |
954 | return 1; | |
955 | ||
1b4b55a1 | 956 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
957 | posix_test_lock(file, flock); |
958 | ||
959 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
960 | flock->fl_type = saved_type; | |
961 | rc = 1; | |
962 | } | |
963 | ||
1b4b55a1 | 964 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
965 | return rc; |
966 | } | |
967 | ||
9a5101c8 PS |
968 | /* |
969 | * Set the byte-range lock (posix style). Returns: | |
970 | * 1) 0, if we set the lock and don't need to request to the server; | |
971 | * 2) 1, if we need to request to the server; | |
972 | * 3) <0, if the error occurs while setting the lock. | |
973 | */ | |
4f6bcec9 PS |
974 | static int |
975 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
976 | { | |
496ad9aa | 977 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
978 | int rc = 1; |
979 | ||
980 | if ((flock->fl_flags & FL_POSIX) == 0) | |
981 | return rc; | |
4f6bcec9 | 982 | |
66189be7 | 983 | try_again: |
1b4b55a1 | 984 | down_write(&cinode->lock_sem); |
4f6bcec9 | 985 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 986 | up_write(&cinode->lock_sem); |
50792760 | 987 | return rc; |
4f6bcec9 | 988 | } |
66189be7 PS |
989 | |
990 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 991 | up_write(&cinode->lock_sem); |
66189be7 PS |
992 | if (rc == FILE_LOCK_DEFERRED) { |
993 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
994 | if (!rc) | |
995 | goto try_again; | |
996 | locks_delete_block(flock); | |
997 | } | |
9ebb389d | 998 | return rc; |
4f6bcec9 PS |
999 | } |
1000 | ||
d39a4f71 | 1001 | int |
4f6bcec9 | 1002 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1003 | { |
6d5786a3 PS |
1004 | unsigned int xid; |
1005 | int rc = 0, stored_rc; | |
85160e03 PS |
1006 | struct cifsLockInfo *li, *tmp; |
1007 | struct cifs_tcon *tcon; | |
0013fb4c | 1008 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
1009 | LOCKING_ANDX_RANGE *buf, *cur; |
1010 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1011 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1012 | int i; | |
85160e03 | 1013 | |
6d5786a3 | 1014 | xid = get_xid(); |
85160e03 PS |
1015 | tcon = tlink_tcon(cfile->tlink); |
1016 | ||
0013fb4c PS |
1017 | /* |
1018 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1019 | * and check it for zero before using. | |
1020 | */ | |
1021 | max_buf = tcon->ses->server->maxBuf; | |
1022 | if (!max_buf) { | |
6d5786a3 | 1023 | free_xid(xid); |
0013fb4c PS |
1024 | return -EINVAL; |
1025 | } | |
1026 | ||
1027 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1028 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
1029 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1030 | if (!buf) { | |
6d5786a3 | 1031 | free_xid(xid); |
e2f2886a | 1032 | return -ENOMEM; |
32b9aaf1 PS |
1033 | } |
1034 | ||
1035 | for (i = 0; i < 2; i++) { | |
1036 | cur = buf; | |
1037 | num = 0; | |
f45d3416 | 1038 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1039 | if (li->type != types[i]) |
1040 | continue; | |
1041 | cur->Pid = cpu_to_le16(li->pid); | |
1042 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1043 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1044 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1045 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1046 | if (++num == max_num) { | |
4b4de76e PS |
1047 | stored_rc = cifs_lockv(xid, tcon, |
1048 | cfile->fid.netfid, | |
04a6aa8a PS |
1049 | (__u8)li->type, 0, num, |
1050 | buf); | |
32b9aaf1 PS |
1051 | if (stored_rc) |
1052 | rc = stored_rc; | |
1053 | cur = buf; | |
1054 | num = 0; | |
1055 | } else | |
1056 | cur++; | |
1057 | } | |
1058 | ||
1059 | if (num) { | |
4b4de76e | 1060 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1061 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1062 | if (stored_rc) |
1063 | rc = stored_rc; | |
1064 | } | |
85160e03 PS |
1065 | } |
1066 | ||
32b9aaf1 | 1067 | kfree(buf); |
6d5786a3 | 1068 | free_xid(xid); |
85160e03 PS |
1069 | return rc; |
1070 | } | |
1071 | ||
4f6bcec9 PS |
1072 | /* copied from fs/locks.c with a name change */ |
1073 | #define cifs_for_each_lock(inode, lockp) \ | |
1074 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1075 | lockp = &(*lockp)->fl_next) | |
1076 | ||
d5751469 PS |
1077 | struct lock_to_push { |
1078 | struct list_head llist; | |
1079 | __u64 offset; | |
1080 | __u64 length; | |
1081 | __u32 pid; | |
1082 | __u16 netfid; | |
1083 | __u8 type; | |
1084 | }; | |
1085 | ||
4f6bcec9 | 1086 | static int |
b8db928b | 1087 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1088 | { |
4f6bcec9 PS |
1089 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1090 | struct file_lock *flock, **before; | |
d5751469 | 1091 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1092 | int rc = 0, xid, type; |
d5751469 PS |
1093 | struct list_head locks_to_send, *el; |
1094 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1095 | __u64 length; |
4f6bcec9 | 1096 | |
6d5786a3 | 1097 | xid = get_xid(); |
4f6bcec9 | 1098 | |
d5751469 PS |
1099 | lock_flocks(); |
1100 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1101 | if ((*before)->fl_flags & FL_POSIX) | |
1102 | count++; | |
1103 | } | |
1104 | unlock_flocks(); | |
1105 | ||
4f6bcec9 PS |
1106 | INIT_LIST_HEAD(&locks_to_send); |
1107 | ||
d5751469 | 1108 | /* |
ce85852b | 1109 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1110 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1111 | * protects locking operations of this inode. |
d5751469 PS |
1112 | */ |
1113 | for (; i < count; i++) { | |
1114 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1115 | if (!lck) { | |
1116 | rc = -ENOMEM; | |
1117 | goto err_out; | |
1118 | } | |
1119 | list_add_tail(&lck->llist, &locks_to_send); | |
1120 | } | |
1121 | ||
d5751469 | 1122 | el = locks_to_send.next; |
4f6bcec9 PS |
1123 | lock_flocks(); |
1124 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1125 | flock = *before; |
1126 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1127 | continue; | |
d5751469 | 1128 | if (el == &locks_to_send) { |
ce85852b PS |
1129 | /* |
1130 | * The list ended. We don't have enough allocated | |
1131 | * structures - something is really wrong. | |
1132 | */ | |
d5751469 PS |
1133 | cERROR(1, "Can't push all brlocks!"); |
1134 | break; | |
1135 | } | |
4f6bcec9 PS |
1136 | length = 1 + flock->fl_end - flock->fl_start; |
1137 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1138 | type = CIFS_RDLCK; | |
1139 | else | |
1140 | type = CIFS_WRLCK; | |
d5751469 | 1141 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1142 | lck->pid = flock->fl_pid; |
4b4de76e | 1143 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1144 | lck->length = length; |
1145 | lck->type = type; | |
1146 | lck->offset = flock->fl_start; | |
d5751469 | 1147 | el = el->next; |
4f6bcec9 | 1148 | } |
4f6bcec9 PS |
1149 | unlock_flocks(); |
1150 | ||
1151 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1152 | int stored_rc; |
1153 | ||
4f6bcec9 | 1154 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1155 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1156 | lck->type, 0); |
1157 | if (stored_rc) | |
1158 | rc = stored_rc; | |
1159 | list_del(&lck->llist); | |
1160 | kfree(lck); | |
1161 | } | |
1162 | ||
d5751469 | 1163 | out: |
6d5786a3 | 1164 | free_xid(xid); |
4f6bcec9 | 1165 | return rc; |
d5751469 PS |
1166 | err_out: |
1167 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1168 | list_del(&lck->llist); | |
1169 | kfree(lck); | |
1170 | } | |
1171 | goto out; | |
4f6bcec9 PS |
1172 | } |
1173 | ||
9ec3c882 | 1174 | static int |
b8db928b | 1175 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1176 | { |
b8db928b | 1177 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1178 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1179 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1180 | int rc = 0; |
1181 | ||
1182 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1183 | down_write(&cinode->lock_sem); | |
1184 | if (!cinode->can_cache_brlcks) { | |
1185 | up_write(&cinode->lock_sem); | |
1186 | return rc; | |
1187 | } | |
4f6bcec9 | 1188 | |
29e20f9c | 1189 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1190 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1191 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1192 | rc = cifs_push_posix_locks(cfile); |
1193 | else | |
1194 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1195 | |
b8db928b PS |
1196 | cinode->can_cache_brlcks = false; |
1197 | up_write(&cinode->lock_sem); | |
1198 | return rc; | |
4f6bcec9 PS |
1199 | } |
1200 | ||
03776f45 | 1201 | static void |
04a6aa8a | 1202 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1203 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1204 | { |
03776f45 | 1205 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1206 | cFYI(1, "Posix"); |
03776f45 | 1207 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1208 | cFYI(1, "Flock"); |
03776f45 | 1209 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1210 | cFYI(1, "Blocking lock"); |
03776f45 | 1211 | *wait_flag = true; |
1da177e4 | 1212 | } |
03776f45 | 1213 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1214 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1215 | "not implemented yet"); |
1216 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1217 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1218 | if (flock->fl_flags & |
3d6d854a JL |
1219 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1220 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
03776f45 | 1221 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1222 | |
106dc538 | 1223 | *type = server->vals->large_lock_type; |
03776f45 | 1224 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1225 | cFYI(1, "F_WRLCK "); |
106dc538 | 1226 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1227 | *lock = 1; |
1228 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1229 | cFYI(1, "F_UNLCK"); |
106dc538 | 1230 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1231 | *unlock = 1; |
1232 | /* Check if unlock includes more than one lock range */ | |
1233 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1234 | cFYI(1, "F_RDLCK"); |
106dc538 | 1235 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1236 | *lock = 1; |
1237 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1238 | cFYI(1, "F_EXLCK"); |
106dc538 | 1239 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1240 | *lock = 1; |
1241 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1242 | cFYI(1, "F_SHLCK"); |
106dc538 | 1243 | *type |= server->vals->shared_lock_type; |
03776f45 | 1244 | *lock = 1; |
1da177e4 | 1245 | } else |
b6b38f70 | 1246 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1247 | } |
1da177e4 | 1248 | |
03776f45 | 1249 | static int |
04a6aa8a | 1250 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1251 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1252 | { |
1253 | int rc = 0; | |
1254 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1255 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1256 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1257 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1258 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1259 | |
03776f45 PS |
1260 | if (posix_lck) { |
1261 | int posix_lock_type; | |
4f6bcec9 PS |
1262 | |
1263 | rc = cifs_posix_lock_test(file, flock); | |
1264 | if (!rc) | |
1265 | return rc; | |
1266 | ||
106dc538 | 1267 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1268 | posix_lock_type = CIFS_RDLCK; |
1269 | else | |
1270 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1271 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1272 | flock->fl_start, length, flock, |
4f6bcec9 | 1273 | posix_lock_type, wait_flag); |
03776f45 PS |
1274 | return rc; |
1275 | } | |
1da177e4 | 1276 | |
fbd35aca | 1277 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1278 | if (!rc) |
1279 | return rc; | |
1280 | ||
03776f45 | 1281 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1282 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1283 | 1, 0, false); | |
03776f45 | 1284 | if (rc == 0) { |
d39a4f71 PS |
1285 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1286 | type, 0, 1, false); | |
03776f45 PS |
1287 | flock->fl_type = F_UNLCK; |
1288 | if (rc != 0) | |
1289 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1290 | "range %d during test of lock", rc); |
a88b4707 | 1291 | return 0; |
1da177e4 | 1292 | } |
7ee1af76 | 1293 | |
106dc538 | 1294 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1295 | flock->fl_type = F_WRLCK; |
a88b4707 | 1296 | return 0; |
7ee1af76 JA |
1297 | } |
1298 | ||
d39a4f71 PS |
1299 | type &= ~server->vals->exclusive_lock_type; |
1300 | ||
1301 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1302 | type | server->vals->shared_lock_type, | |
1303 | 1, 0, false); | |
03776f45 | 1304 | if (rc == 0) { |
d39a4f71 PS |
1305 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1306 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1307 | flock->fl_type = F_RDLCK; |
1308 | if (rc != 0) | |
1309 | cERROR(1, "Error unlocking previously locked " | |
1310 | "range %d during test of lock", rc); | |
1311 | } else | |
1312 | flock->fl_type = F_WRLCK; | |
1313 | ||
a88b4707 | 1314 | return 0; |
03776f45 PS |
1315 | } |
1316 | ||
f7ba7fe6 | 1317 | void |
9ee305b7 PS |
1318 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1319 | { | |
1320 | struct list_head *li, *tmp; | |
1321 | list_for_each_safe(li, tmp, source) | |
1322 | list_move(li, dest); | |
1323 | } | |
1324 | ||
f7ba7fe6 | 1325 | void |
9ee305b7 PS |
1326 | cifs_free_llist(struct list_head *llist) |
1327 | { | |
1328 | struct cifsLockInfo *li, *tmp; | |
1329 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1330 | cifs_del_lock_waiters(li); | |
1331 | list_del(&li->llist); | |
1332 | kfree(li); | |
1333 | } | |
1334 | } | |
1335 | ||
d39a4f71 | 1336 | int |
6d5786a3 PS |
1337 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1338 | unsigned int xid) | |
9ee305b7 PS |
1339 | { |
1340 | int rc = 0, stored_rc; | |
1341 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1342 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1343 | unsigned int i; | |
0013fb4c | 1344 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1345 | LOCKING_ANDX_RANGE *buf, *cur; |
1346 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1347 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1348 | struct cifsLockInfo *li, *tmp; | |
1349 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1350 | struct list_head tmp_llist; | |
1351 | ||
1352 | INIT_LIST_HEAD(&tmp_llist); | |
1353 | ||
0013fb4c PS |
1354 | /* |
1355 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1356 | * and check it for zero before using. | |
1357 | */ | |
1358 | max_buf = tcon->ses->server->maxBuf; | |
1359 | if (!max_buf) | |
1360 | return -EINVAL; | |
1361 | ||
1362 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1363 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1364 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1365 | if (!buf) | |
1366 | return -ENOMEM; | |
1367 | ||
1b4b55a1 | 1368 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1369 | for (i = 0; i < 2; i++) { |
1370 | cur = buf; | |
1371 | num = 0; | |
f45d3416 | 1372 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1373 | if (flock->fl_start > li->offset || |
1374 | (flock->fl_start + length) < | |
1375 | (li->offset + li->length)) | |
1376 | continue; | |
1377 | if (current->tgid != li->pid) | |
1378 | continue; | |
9ee305b7 PS |
1379 | if (types[i] != li->type) |
1380 | continue; | |
ea319d57 | 1381 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1382 | /* |
1383 | * We can cache brlock requests - simply remove | |
fbd35aca | 1384 | * a lock from the file's list. |
9ee305b7 PS |
1385 | */ |
1386 | list_del(&li->llist); | |
1387 | cifs_del_lock_waiters(li); | |
1388 | kfree(li); | |
ea319d57 | 1389 | continue; |
9ee305b7 | 1390 | } |
ea319d57 PS |
1391 | cur->Pid = cpu_to_le16(li->pid); |
1392 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1393 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1394 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1395 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1396 | /* | |
1397 | * We need to save a lock here to let us add it again to | |
1398 | * the file's list if the unlock range request fails on | |
1399 | * the server. | |
1400 | */ | |
1401 | list_move(&li->llist, &tmp_llist); | |
1402 | if (++num == max_num) { | |
4b4de76e PS |
1403 | stored_rc = cifs_lockv(xid, tcon, |
1404 | cfile->fid.netfid, | |
ea319d57 PS |
1405 | li->type, num, 0, buf); |
1406 | if (stored_rc) { | |
1407 | /* | |
1408 | * We failed on the unlock range | |
1409 | * request - add all locks from the tmp | |
1410 | * list to the head of the file's list. | |
1411 | */ | |
1412 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1413 | &cfile->llist->locks); |
ea319d57 PS |
1414 | rc = stored_rc; |
1415 | } else | |
1416 | /* | |
1417 | * The unlock range request succeed - | |
1418 | * free the tmp list. | |
1419 | */ | |
1420 | cifs_free_llist(&tmp_llist); | |
1421 | cur = buf; | |
1422 | num = 0; | |
1423 | } else | |
1424 | cur++; | |
9ee305b7 PS |
1425 | } |
1426 | if (num) { | |
4b4de76e | 1427 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1428 | types[i], num, 0, buf); |
1429 | if (stored_rc) { | |
f45d3416 PS |
1430 | cifs_move_llist(&tmp_llist, |
1431 | &cfile->llist->locks); | |
9ee305b7 PS |
1432 | rc = stored_rc; |
1433 | } else | |
1434 | cifs_free_llist(&tmp_llist); | |
1435 | } | |
1436 | } | |
1437 | ||
1b4b55a1 | 1438 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1439 | kfree(buf); |
1440 | return rc; | |
1441 | } | |
1442 | ||
03776f45 | 1443 | static int |
f45d3416 | 1444 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1445 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1446 | unsigned int xid) | |
03776f45 PS |
1447 | { |
1448 | int rc = 0; | |
1449 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1450 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1451 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1452 | struct TCP_Server_Info *server = tcon->ses->server; |
63b7d3a4 | 1453 | struct inode *inode = cfile->dentry->d_inode; |
03776f45 PS |
1454 | |
1455 | if (posix_lck) { | |
08547b03 | 1456 | int posix_lock_type; |
4f6bcec9 PS |
1457 | |
1458 | rc = cifs_posix_lock_set(file, flock); | |
1459 | if (!rc || rc < 0) | |
1460 | return rc; | |
1461 | ||
106dc538 | 1462 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1463 | posix_lock_type = CIFS_RDLCK; |
1464 | else | |
1465 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1466 | |
03776f45 | 1467 | if (unlock == 1) |
beb84dc8 | 1468 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1469 | |
f45d3416 PS |
1470 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1471 | current->tgid, flock->fl_start, length, | |
1472 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1473 | goto out; |
1474 | } | |
7ee1af76 | 1475 | |
03776f45 | 1476 | if (lock) { |
161ebf9f PS |
1477 | struct cifsLockInfo *lock; |
1478 | ||
fbd35aca | 1479 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1480 | if (!lock) |
1481 | return -ENOMEM; | |
1482 | ||
fbd35aca | 1483 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1484 | if (rc < 0) { |
161ebf9f | 1485 | kfree(lock); |
21cb2d90 PS |
1486 | return rc; |
1487 | } | |
1488 | if (!rc) | |
85160e03 PS |
1489 | goto out; |
1490 | ||
63b7d3a4 PS |
1491 | /* |
1492 | * Windows 7 server can delay breaking lease from read to None | |
1493 | * if we set a byte-range lock on a file - break it explicitly | |
1494 | * before sending the lock to the server to be sure the next | |
1495 | * read won't conflict with non-overlapted locks due to | |
1496 | * pagereading. | |
1497 | */ | |
1498 | if (!CIFS_I(inode)->clientCanCacheAll && | |
1499 | CIFS_I(inode)->clientCanCacheRead) { | |
1500 | cifs_invalidate_mapping(inode); | |
1501 | cFYI(1, "Set no oplock for inode=%p due to mand locks", | |
1502 | inode); | |
1503 | CIFS_I(inode)->clientCanCacheRead = false; | |
1504 | } | |
1505 | ||
d39a4f71 PS |
1506 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1507 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1508 | if (rc) { |
1509 | kfree(lock); | |
21cb2d90 | 1510 | return rc; |
03776f45 | 1511 | } |
161ebf9f | 1512 | |
fbd35aca | 1513 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1514 | } else if (unlock) |
d39a4f71 | 1515 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1516 | |
03776f45 PS |
1517 | out: |
1518 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1519 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1520 | return rc; |
1521 | } | |
1522 | ||
1523 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1524 | { | |
1525 | int rc, xid; | |
1526 | int lock = 0, unlock = 0; | |
1527 | bool wait_flag = false; | |
1528 | bool posix_lck = false; | |
1529 | struct cifs_sb_info *cifs_sb; | |
1530 | struct cifs_tcon *tcon; | |
1531 | struct cifsInodeInfo *cinode; | |
1532 | struct cifsFileInfo *cfile; | |
1533 | __u16 netfid; | |
04a6aa8a | 1534 | __u32 type; |
03776f45 PS |
1535 | |
1536 | rc = -EACCES; | |
6d5786a3 | 1537 | xid = get_xid(); |
03776f45 PS |
1538 | |
1539 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1540 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1541 | flock->fl_start, flock->fl_end); | |
1542 | ||
03776f45 PS |
1543 | cfile = (struct cifsFileInfo *)file->private_data; |
1544 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1545 | |
1546 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1547 | tcon->ses->server); | |
1548 | ||
1549 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1550 | netfid = cfile->fid.netfid; |
496ad9aa | 1551 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1552 | |
29e20f9c | 1553 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1554 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1555 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1556 | posix_lck = true; | |
1557 | /* | |
1558 | * BB add code here to normalize offset and length to account for | |
1559 | * negative length which we can not accept over the wire. | |
1560 | */ | |
1561 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1562 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1563 | free_xid(xid); |
03776f45 PS |
1564 | return rc; |
1565 | } | |
1566 | ||
1567 | if (!lock && !unlock) { | |
1568 | /* | |
1569 | * if no lock or unlock then nothing to do since we do not | |
1570 | * know what it is | |
1571 | */ | |
6d5786a3 | 1572 | free_xid(xid); |
03776f45 | 1573 | return -EOPNOTSUPP; |
7ee1af76 JA |
1574 | } |
1575 | ||
03776f45 PS |
1576 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1577 | xid); | |
6d5786a3 | 1578 | free_xid(xid); |
1da177e4 LT |
1579 | return rc; |
1580 | } | |
1581 | ||
597b027f JL |
1582 | /* |
1583 | * update the file size (if needed) after a write. Should be called with | |
1584 | * the inode->i_lock held | |
1585 | */ | |
72432ffc | 1586 | void |
fbec9ab9 JL |
1587 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1588 | unsigned int bytes_written) | |
1589 | { | |
1590 | loff_t end_of_write = offset + bytes_written; | |
1591 | ||
1592 | if (end_of_write > cifsi->server_eof) | |
1593 | cifsi->server_eof = end_of_write; | |
1594 | } | |
1595 | ||
ba9ad725 PS |
1596 | static ssize_t |
1597 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1598 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1599 | { |
1600 | int rc = 0; | |
1601 | unsigned int bytes_written = 0; | |
1602 | unsigned int total_written; | |
1603 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1604 | struct cifs_tcon *tcon; |
1605 | struct TCP_Server_Info *server; | |
6d5786a3 | 1606 | unsigned int xid; |
7da4b49a JL |
1607 | struct dentry *dentry = open_file->dentry; |
1608 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1609 | struct cifs_io_parms io_parms; |
1da177e4 | 1610 | |
7da4b49a | 1611 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1612 | |
b6b38f70 | 1613 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1614 | *offset, dentry->d_name.name); |
1da177e4 | 1615 | |
ba9ad725 PS |
1616 | tcon = tlink_tcon(open_file->tlink); |
1617 | server = tcon->ses->server; | |
1618 | ||
1619 | if (!server->ops->sync_write) | |
1620 | return -ENOSYS; | |
50c2f753 | 1621 | |
6d5786a3 | 1622 | xid = get_xid(); |
1da177e4 | 1623 | |
1da177e4 LT |
1624 | for (total_written = 0; write_size > total_written; |
1625 | total_written += bytes_written) { | |
1626 | rc = -EAGAIN; | |
1627 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1628 | struct kvec iov[2]; |
1629 | unsigned int len; | |
1630 | ||
1da177e4 | 1631 | if (open_file->invalidHandle) { |
1da177e4 LT |
1632 | /* we could deadlock if we called |
1633 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1634 | reopen_file not to flush data to |
1da177e4 | 1635 | server now */ |
15886177 | 1636 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1637 | if (rc != 0) |
1638 | break; | |
1639 | } | |
ca83ce3d JL |
1640 | |
1641 | len = min((size_t)cifs_sb->wsize, | |
1642 | write_size - total_written); | |
1643 | /* iov[0] is reserved for smb header */ | |
1644 | iov[1].iov_base = (char *)write_data + total_written; | |
1645 | iov[1].iov_len = len; | |
fa2989f4 | 1646 | io_parms.pid = pid; |
ba9ad725 PS |
1647 | io_parms.tcon = tcon; |
1648 | io_parms.offset = *offset; | |
fa2989f4 | 1649 | io_parms.length = len; |
ba9ad725 PS |
1650 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1651 | &bytes_written, iov, 1); | |
1da177e4 LT |
1652 | } |
1653 | if (rc || (bytes_written == 0)) { | |
1654 | if (total_written) | |
1655 | break; | |
1656 | else { | |
6d5786a3 | 1657 | free_xid(xid); |
1da177e4 LT |
1658 | return rc; |
1659 | } | |
fbec9ab9 | 1660 | } else { |
597b027f | 1661 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1662 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1663 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1664 | *offset += bytes_written; |
fbec9ab9 | 1665 | } |
1da177e4 LT |
1666 | } |
1667 | ||
ba9ad725 | 1668 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1669 | |
7da4b49a JL |
1670 | if (total_written > 0) { |
1671 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1672 | if (*offset > dentry->d_inode->i_size) |
1673 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1674 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1675 | } |
7da4b49a | 1676 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1677 | free_xid(xid); |
1da177e4 LT |
1678 | return total_written; |
1679 | } | |
1680 | ||
6508d904 JL |
1681 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1682 | bool fsuid_only) | |
630f3f0c SF |
1683 | { |
1684 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1685 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1686 | ||
1687 | /* only filter by fsuid on multiuser mounts */ | |
1688 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1689 | fsuid_only = false; | |
630f3f0c | 1690 | |
4477288a | 1691 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1692 | /* we could simply get the first_list_entry since write-only entries |
1693 | are always at the end of the list but since the first entry might | |
1694 | have a close pending, we go through the whole list */ | |
1695 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1696 | if (fsuid_only && open_file->uid != current_fsuid()) |
1697 | continue; | |
2e396b83 | 1698 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1699 | if (!open_file->invalidHandle) { |
1700 | /* found a good file */ | |
1701 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1702 | cifsFileInfo_get_locked(open_file); |
4477288a | 1703 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1704 | return open_file; |
1705 | } /* else might as well continue, and look for | |
1706 | another, or simply have the caller reopen it | |
1707 | again rather than trying to fix this handle */ | |
1708 | } else /* write only file */ | |
1709 | break; /* write only files are last so must be done */ | |
1710 | } | |
4477288a | 1711 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1712 | return NULL; |
1713 | } | |
630f3f0c | 1714 | |
6508d904 JL |
1715 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1716 | bool fsuid_only) | |
6148a742 | 1717 | { |
2c0c2a08 | 1718 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1719 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1720 | bool any_available = false; |
dd99cd80 | 1721 | int rc; |
2c0c2a08 | 1722 | unsigned int refind = 0; |
6148a742 | 1723 | |
60808233 SF |
1724 | /* Having a null inode here (because mapping->host was set to zero by |
1725 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1726 | it being zero) during stress testcases so we need to check for it */ | |
1727 | ||
fb8c4b14 | 1728 | if (cifs_inode == NULL) { |
b6b38f70 | 1729 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1730 | dump_stack(); |
1731 | return NULL; | |
1732 | } | |
1733 | ||
d3892294 JL |
1734 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1735 | ||
6508d904 JL |
1736 | /* only filter by fsuid on multiuser mounts */ |
1737 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1738 | fsuid_only = false; | |
1739 | ||
4477288a | 1740 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1741 | refind_writable: |
2c0c2a08 SP |
1742 | if (refind > MAX_REOPEN_ATT) { |
1743 | spin_unlock(&cifs_file_list_lock); | |
1744 | return NULL; | |
1745 | } | |
6148a742 | 1746 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1747 | if (!any_available && open_file->pid != current->tgid) |
1748 | continue; | |
1749 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1750 | continue; |
2e396b83 | 1751 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1752 | if (!open_file->invalidHandle) { |
1753 | /* found a good writable file */ | |
764a1b1a | 1754 | cifsFileInfo_get_locked(open_file); |
4477288a | 1755 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1756 | return open_file; |
2c0c2a08 SP |
1757 | } else { |
1758 | if (!inv_file) | |
1759 | inv_file = open_file; | |
9b22b0b7 | 1760 | } |
6148a742 SF |
1761 | } |
1762 | } | |
2846d386 JL |
1763 | /* couldn't find useable FH with same pid, try any available */ |
1764 | if (!any_available) { | |
1765 | any_available = true; | |
1766 | goto refind_writable; | |
1767 | } | |
2c0c2a08 SP |
1768 | |
1769 | if (inv_file) { | |
1770 | any_available = false; | |
764a1b1a | 1771 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1772 | } |
1773 | ||
4477288a | 1774 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1775 | |
1776 | if (inv_file) { | |
1777 | rc = cifs_reopen_file(inv_file, false); | |
1778 | if (!rc) | |
1779 | return inv_file; | |
1780 | else { | |
1781 | spin_lock(&cifs_file_list_lock); | |
1782 | list_move_tail(&inv_file->flist, | |
1783 | &cifs_inode->openFileList); | |
1784 | spin_unlock(&cifs_file_list_lock); | |
1785 | cifsFileInfo_put(inv_file); | |
1786 | spin_lock(&cifs_file_list_lock); | |
1787 | ++refind; | |
1788 | goto refind_writable; | |
1789 | } | |
1790 | } | |
1791 | ||
6148a742 SF |
1792 | return NULL; |
1793 | } | |
1794 | ||
1da177e4 LT |
1795 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1796 | { | |
1797 | struct address_space *mapping = page->mapping; | |
1798 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1799 | char *write_data; | |
1800 | int rc = -EFAULT; | |
1801 | int bytes_written = 0; | |
1da177e4 | 1802 | struct inode *inode; |
6148a742 | 1803 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1804 | |
1805 | if (!mapping || !mapping->host) | |
1806 | return -EFAULT; | |
1807 | ||
1808 | inode = page->mapping->host; | |
1da177e4 LT |
1809 | |
1810 | offset += (loff_t)from; | |
1811 | write_data = kmap(page); | |
1812 | write_data += from; | |
1813 | ||
1814 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1815 | kunmap(page); | |
1816 | return -EIO; | |
1817 | } | |
1818 | ||
1819 | /* racing with truncate? */ | |
1820 | if (offset > mapping->host->i_size) { | |
1821 | kunmap(page); | |
1822 | return 0; /* don't care */ | |
1823 | } | |
1824 | ||
1825 | /* check to make sure that we are not extending the file */ | |
1826 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1827 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1828 | |
6508d904 | 1829 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1830 | if (open_file) { |
fa2989f4 PS |
1831 | bytes_written = cifs_write(open_file, open_file->pid, |
1832 | write_data, to - from, &offset); | |
6ab409b5 | 1833 | cifsFileInfo_put(open_file); |
1da177e4 | 1834 | /* Does mm or vfs already set times? */ |
6148a742 | 1835 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1836 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1837 | rc = 0; |
bb5a9a04 SF |
1838 | else if (bytes_written < 0) |
1839 | rc = bytes_written; | |
6148a742 | 1840 | } else { |
b6b38f70 | 1841 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1842 | rc = -EIO; |
1843 | } | |
1844 | ||
1845 | kunmap(page); | |
1846 | return rc; | |
1847 | } | |
1848 | ||
1da177e4 | 1849 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1850 | struct writeback_control *wbc) |
1da177e4 | 1851 | { |
c3d17b63 JL |
1852 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1853 | bool done = false, scanned = false, range_whole = false; | |
1854 | pgoff_t end, index; | |
1855 | struct cifs_writedata *wdata; | |
c9de5c80 | 1856 | struct TCP_Server_Info *server; |
37c0eb46 | 1857 | struct page *page; |
37c0eb46 | 1858 | int rc = 0; |
50c2f753 | 1859 | |
37c0eb46 | 1860 | /* |
c3d17b63 | 1861 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1862 | * one page at a time via cifs_writepage |
1863 | */ | |
1864 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1865 | return generic_writepages(mapping, wbc); | |
1866 | ||
111ebb6e | 1867 | if (wbc->range_cyclic) { |
37c0eb46 | 1868 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1869 | end = -1; |
1870 | } else { | |
1871 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1872 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1873 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1874 | range_whole = true; |
1875 | scanned = true; | |
37c0eb46 SF |
1876 | } |
1877 | retry: | |
c3d17b63 JL |
1878 | while (!done && index <= end) { |
1879 | unsigned int i, nr_pages, found_pages; | |
1880 | pgoff_t next = 0, tofind; | |
1881 | struct page **pages; | |
1882 | ||
1883 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1884 | end - index) + 1; | |
1885 | ||
c2e87640 JL |
1886 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1887 | cifs_writev_complete); | |
c3d17b63 JL |
1888 | if (!wdata) { |
1889 | rc = -ENOMEM; | |
1890 | break; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * find_get_pages_tag seems to return a max of 256 on each | |
1895 | * iteration, so we must call it several times in order to | |
1896 | * fill the array or the wsize is effectively limited to | |
1897 | * 256 * PAGE_CACHE_SIZE. | |
1898 | */ | |
1899 | found_pages = 0; | |
1900 | pages = wdata->pages; | |
1901 | do { | |
1902 | nr_pages = find_get_pages_tag(mapping, &index, | |
1903 | PAGECACHE_TAG_DIRTY, | |
1904 | tofind, pages); | |
1905 | found_pages += nr_pages; | |
1906 | tofind -= nr_pages; | |
1907 | pages += nr_pages; | |
1908 | } while (nr_pages && tofind && index <= end); | |
1909 | ||
1910 | if (found_pages == 0) { | |
1911 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1912 | break; | |
1913 | } | |
1914 | ||
1915 | nr_pages = 0; | |
1916 | for (i = 0; i < found_pages; i++) { | |
1917 | page = wdata->pages[i]; | |
37c0eb46 SF |
1918 | /* |
1919 | * At this point we hold neither mapping->tree_lock nor | |
1920 | * lock on the page itself: the page may be truncated or | |
1921 | * invalidated (changing page->mapping to NULL), or even | |
1922 | * swizzled back from swapper_space to tmpfs file | |
1923 | * mapping | |
1924 | */ | |
1925 | ||
c3d17b63 | 1926 | if (nr_pages == 0) |
37c0eb46 | 1927 | lock_page(page); |
529ae9aa | 1928 | else if (!trylock_page(page)) |
37c0eb46 SF |
1929 | break; |
1930 | ||
1931 | if (unlikely(page->mapping != mapping)) { | |
1932 | unlock_page(page); | |
1933 | break; | |
1934 | } | |
1935 | ||
111ebb6e | 1936 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1937 | done = true; |
37c0eb46 SF |
1938 | unlock_page(page); |
1939 | break; | |
1940 | } | |
1941 | ||
1942 | if (next && (page->index != next)) { | |
1943 | /* Not next consecutive page */ | |
1944 | unlock_page(page); | |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1949 | wait_on_page_writeback(page); | |
1950 | ||
1951 | if (PageWriteback(page) || | |
cb876f45 | 1952 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1953 | unlock_page(page); |
1954 | break; | |
1955 | } | |
84d2f07e | 1956 | |
cb876f45 LT |
1957 | /* |
1958 | * This actually clears the dirty bit in the radix tree. | |
1959 | * See cifs_writepage() for more commentary. | |
1960 | */ | |
1961 | set_page_writeback(page); | |
1962 | ||
3a98b861 | 1963 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1964 | done = true; |
84d2f07e | 1965 | unlock_page(page); |
cb876f45 | 1966 | end_page_writeback(page); |
84d2f07e SF |
1967 | break; |
1968 | } | |
1969 | ||
c3d17b63 JL |
1970 | wdata->pages[i] = page; |
1971 | next = page->index + 1; | |
1972 | ++nr_pages; | |
1973 | } | |
37c0eb46 | 1974 | |
c3d17b63 JL |
1975 | /* reset index to refind any pages skipped */ |
1976 | if (nr_pages == 0) | |
1977 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1978 | |
c3d17b63 JL |
1979 | /* put any pages we aren't going to use */ |
1980 | for (i = nr_pages; i < found_pages; i++) { | |
1981 | page_cache_release(wdata->pages[i]); | |
1982 | wdata->pages[i] = NULL; | |
1983 | } | |
37c0eb46 | 1984 | |
c3d17b63 JL |
1985 | /* nothing to write? */ |
1986 | if (nr_pages == 0) { | |
1987 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1988 | continue; | |
37c0eb46 | 1989 | } |
fbec9ab9 | 1990 | |
c3d17b63 JL |
1991 | wdata->sync_mode = wbc->sync_mode; |
1992 | wdata->nr_pages = nr_pages; | |
1993 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
1994 | wdata->pagesz = PAGE_CACHE_SIZE; |
1995 | wdata->tailsz = | |
3a98b861 JL |
1996 | min(i_size_read(mapping->host) - |
1997 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
1998 | (loff_t)PAGE_CACHE_SIZE); |
1999 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
2000 | wdata->tailsz; | |
941b853d | 2001 | |
c3d17b63 JL |
2002 | do { |
2003 | if (wdata->cfile != NULL) | |
2004 | cifsFileInfo_put(wdata->cfile); | |
2005 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
2006 | false); | |
2007 | if (!wdata->cfile) { | |
2008 | cERROR(1, "No writable handles for inode"); | |
2009 | rc = -EBADF; | |
2010 | break; | |
941b853d | 2011 | } |
fe5f5d2e | 2012 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
2013 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
2014 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 2015 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 2016 | |
c3d17b63 JL |
2017 | for (i = 0; i < nr_pages; ++i) |
2018 | unlock_page(wdata->pages[i]); | |
f3983c21 | 2019 | |
c3d17b63 JL |
2020 | /* send failure -- clean up the mess */ |
2021 | if (rc != 0) { | |
2022 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 2023 | if (rc == -EAGAIN) |
c3d17b63 JL |
2024 | redirty_page_for_writepage(wbc, |
2025 | wdata->pages[i]); | |
2026 | else | |
2027 | SetPageError(wdata->pages[i]); | |
2028 | end_page_writeback(wdata->pages[i]); | |
2029 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 2030 | } |
941b853d JL |
2031 | if (rc != -EAGAIN) |
2032 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2033 | } |
2034 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2035 | |
c3d17b63 JL |
2036 | wbc->nr_to_write -= nr_pages; |
2037 | if (wbc->nr_to_write <= 0) | |
2038 | done = true; | |
b066a48c | 2039 | |
c3d17b63 | 2040 | index = next; |
37c0eb46 | 2041 | } |
c3d17b63 | 2042 | |
37c0eb46 SF |
2043 | if (!scanned && !done) { |
2044 | /* | |
2045 | * We hit the last page and there is more work to be done: wrap | |
2046 | * back to the start of the file | |
2047 | */ | |
c3d17b63 | 2048 | scanned = true; |
37c0eb46 SF |
2049 | index = 0; |
2050 | goto retry; | |
2051 | } | |
c3d17b63 | 2052 | |
111ebb6e | 2053 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2054 | mapping->writeback_index = index; |
2055 | ||
1da177e4 LT |
2056 | return rc; |
2057 | } | |
1da177e4 | 2058 | |
9ad1506b PS |
2059 | static int |
2060 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2061 | { |
9ad1506b | 2062 | int rc; |
6d5786a3 | 2063 | unsigned int xid; |
1da177e4 | 2064 | |
6d5786a3 | 2065 | xid = get_xid(); |
1da177e4 LT |
2066 | /* BB add check for wbc flags */ |
2067 | page_cache_get(page); | |
ad7a2926 | 2068 | if (!PageUptodate(page)) |
b6b38f70 | 2069 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
2070 | |
2071 | /* | |
2072 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2073 | * | |
2074 | * A writepage() implementation always needs to do either this, | |
2075 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2076 | * the case of a failure. | |
2077 | * | |
2078 | * Just unlocking the page will cause the radix tree tag-bits | |
2079 | * to fail to update with the state of the page correctly. | |
2080 | */ | |
fb8c4b14 | 2081 | set_page_writeback(page); |
9ad1506b | 2082 | retry_write: |
1da177e4 | 2083 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2084 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2085 | goto retry_write; | |
2086 | else if (rc == -EAGAIN) | |
2087 | redirty_page_for_writepage(wbc, page); | |
2088 | else if (rc != 0) | |
2089 | SetPageError(page); | |
2090 | else | |
2091 | SetPageUptodate(page); | |
cb876f45 LT |
2092 | end_page_writeback(page); |
2093 | page_cache_release(page); | |
6d5786a3 | 2094 | free_xid(xid); |
1da177e4 LT |
2095 | return rc; |
2096 | } | |
2097 | ||
9ad1506b PS |
2098 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2099 | { | |
2100 | int rc = cifs_writepage_locked(page, wbc); | |
2101 | unlock_page(page); | |
2102 | return rc; | |
2103 | } | |
2104 | ||
d9414774 NP |
2105 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2106 | loff_t pos, unsigned len, unsigned copied, | |
2107 | struct page *page, void *fsdata) | |
1da177e4 | 2108 | { |
d9414774 NP |
2109 | int rc; |
2110 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2111 | struct cifsFileInfo *cfile = file->private_data; |
2112 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2113 | __u32 pid; | |
2114 | ||
2115 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2116 | pid = cfile->pid; | |
2117 | else | |
2118 | pid = current->tgid; | |
1da177e4 | 2119 | |
b6b38f70 JP |
2120 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2121 | page, pos, copied); | |
d9414774 | 2122 | |
a98ee8c1 JL |
2123 | if (PageChecked(page)) { |
2124 | if (copied == len) | |
2125 | SetPageUptodate(page); | |
2126 | ClearPageChecked(page); | |
2127 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2128 | SetPageUptodate(page); |
ad7a2926 | 2129 | |
1da177e4 | 2130 | if (!PageUptodate(page)) { |
d9414774 NP |
2131 | char *page_data; |
2132 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2133 | unsigned int xid; |
d9414774 | 2134 | |
6d5786a3 | 2135 | xid = get_xid(); |
1da177e4 LT |
2136 | /* this is probably better than directly calling |
2137 | partialpage_write since in this function the file handle is | |
2138 | known which we might as well leverage */ | |
2139 | /* BB check if anything else missing out of ppw | |
2140 | such as updating last write time */ | |
2141 | page_data = kmap(page); | |
d4ffff1f | 2142 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2143 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2144 | kunmap(page); |
d9414774 | 2145 | |
6d5786a3 | 2146 | free_xid(xid); |
fb8c4b14 | 2147 | } else { |
d9414774 NP |
2148 | rc = copied; |
2149 | pos += copied; | |
ca8aa29c | 2150 | set_page_dirty(page); |
1da177e4 LT |
2151 | } |
2152 | ||
d9414774 NP |
2153 | if (rc > 0) { |
2154 | spin_lock(&inode->i_lock); | |
2155 | if (pos > inode->i_size) | |
2156 | i_size_write(inode, pos); | |
2157 | spin_unlock(&inode->i_lock); | |
2158 | } | |
2159 | ||
2160 | unlock_page(page); | |
2161 | page_cache_release(page); | |
2162 | ||
1da177e4 LT |
2163 | return rc; |
2164 | } | |
2165 | ||
02c24a82 JB |
2166 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2167 | int datasync) | |
1da177e4 | 2168 | { |
6d5786a3 | 2169 | unsigned int xid; |
1da177e4 | 2170 | int rc = 0; |
96daf2b0 | 2171 | struct cifs_tcon *tcon; |
1d8c4c00 | 2172 | struct TCP_Server_Info *server; |
c21dfb69 | 2173 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2174 | struct inode *inode = file_inode(file); |
8be7e6ba | 2175 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2176 | |
02c24a82 JB |
2177 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2178 | if (rc) | |
2179 | return rc; | |
2180 | mutex_lock(&inode->i_mutex); | |
2181 | ||
6d5786a3 | 2182 | xid = get_xid(); |
1da177e4 | 2183 | |
b6b38f70 | 2184 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2185 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2186 | |
6feb9891 PS |
2187 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2188 | rc = cifs_invalidate_mapping(inode); | |
2189 | if (rc) { | |
2190 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2191 | rc = 0; /* don't care about it in fsync */ | |
2192 | } | |
2193 | } | |
eb4b756b | 2194 | |
8be7e6ba | 2195 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2196 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2197 | server = tcon->ses->server; | |
2198 | if (server->ops->flush) | |
2199 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2200 | else | |
2201 | rc = -ENOSYS; | |
2202 | } | |
8be7e6ba | 2203 | |
6d5786a3 | 2204 | free_xid(xid); |
02c24a82 | 2205 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2206 | return rc; |
2207 | } | |
2208 | ||
02c24a82 | 2209 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2210 | { |
6d5786a3 | 2211 | unsigned int xid; |
8be7e6ba | 2212 | int rc = 0; |
96daf2b0 | 2213 | struct cifs_tcon *tcon; |
1d8c4c00 | 2214 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2215 | struct cifsFileInfo *smbfile = file->private_data; |
2216 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2217 | struct inode *inode = file->f_mapping->host; |
2218 | ||
2219 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2220 | if (rc) | |
2221 | return rc; | |
2222 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2223 | |
6d5786a3 | 2224 | xid = get_xid(); |
8be7e6ba PS |
2225 | |
2226 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2227 | file->f_path.dentry->d_name.name, datasync); | |
2228 | ||
2229 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2230 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2231 | server = tcon->ses->server; | |
2232 | if (server->ops->flush) | |
2233 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2234 | else | |
2235 | rc = -ENOSYS; | |
2236 | } | |
b298f223 | 2237 | |
6d5786a3 | 2238 | free_xid(xid); |
02c24a82 | 2239 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2240 | return rc; |
2241 | } | |
2242 | ||
1da177e4 LT |
2243 | /* |
2244 | * As file closes, flush all cached write data for this inode checking | |
2245 | * for write behind errors. | |
2246 | */ | |
75e1fcc0 | 2247 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2248 | { |
496ad9aa | 2249 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2250 | int rc = 0; |
2251 | ||
eb4b756b | 2252 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2253 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2254 | |
b6b38f70 | 2255 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2256 | |
2257 | return rc; | |
2258 | } | |
2259 | ||
72432ffc PS |
2260 | static int |
2261 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2262 | { | |
2263 | int rc = 0; | |
2264 | unsigned long i; | |
2265 | ||
2266 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2267 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2268 | if (!pages[i]) { |
2269 | /* | |
2270 | * save number of pages we have already allocated and | |
2271 | * return with ENOMEM error | |
2272 | */ | |
2273 | num_pages = i; | |
2274 | rc = -ENOMEM; | |
e94f7ba1 | 2275 | break; |
72432ffc PS |
2276 | } |
2277 | } | |
2278 | ||
e94f7ba1 JL |
2279 | if (rc) { |
2280 | for (i = 0; i < num_pages; i++) | |
2281 | put_page(pages[i]); | |
2282 | } | |
72432ffc PS |
2283 | return rc; |
2284 | } | |
2285 | ||
2286 | static inline | |
2287 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2288 | { | |
2289 | size_t num_pages; | |
2290 | size_t clen; | |
2291 | ||
2292 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2293 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2294 | |
2295 | if (cur_len) | |
2296 | *cur_len = clen; | |
2297 | ||
2298 | return num_pages; | |
2299 | } | |
2300 | ||
da82f7e7 JL |
2301 | static void |
2302 | cifs_uncached_writev_complete(struct work_struct *work) | |
2303 | { | |
2304 | int i; | |
2305 | struct cifs_writedata *wdata = container_of(work, | |
2306 | struct cifs_writedata, work); | |
2307 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2308 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2309 | ||
2310 | spin_lock(&inode->i_lock); | |
2311 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2312 | if (cifsi->server_eof > inode->i_size) | |
2313 | i_size_write(inode, cifsi->server_eof); | |
2314 | spin_unlock(&inode->i_lock); | |
2315 | ||
2316 | complete(&wdata->done); | |
2317 | ||
2318 | if (wdata->result != -EAGAIN) { | |
2319 | for (i = 0; i < wdata->nr_pages; i++) | |
2320 | put_page(wdata->pages[i]); | |
2321 | } | |
2322 | ||
2323 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2324 | } | |
2325 | ||
2326 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2327 | static int | |
2328 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2329 | { | |
2330 | int rc; | |
c9de5c80 PS |
2331 | struct TCP_Server_Info *server; |
2332 | ||
2333 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2334 | |
2335 | do { | |
2336 | if (wdata->cfile->invalidHandle) { | |
2337 | rc = cifs_reopen_file(wdata->cfile, false); | |
2338 | if (rc != 0) | |
2339 | continue; | |
2340 | } | |
c9de5c80 | 2341 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2342 | } while (rc == -EAGAIN); |
2343 | ||
2344 | return rc; | |
2345 | } | |
2346 | ||
72432ffc PS |
2347 | static ssize_t |
2348 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2349 | unsigned long nr_segs, loff_t *poffset) | |
2350 | { | |
da82f7e7 | 2351 | unsigned long nr_pages, i; |
76429c14 PS |
2352 | size_t copied, len, cur_len; |
2353 | ssize_t total_written = 0; | |
3af9d8f2 | 2354 | loff_t offset; |
72432ffc | 2355 | struct iov_iter it; |
72432ffc | 2356 | struct cifsFileInfo *open_file; |
da82f7e7 | 2357 | struct cifs_tcon *tcon; |
72432ffc | 2358 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2359 | struct cifs_writedata *wdata, *tmp; |
2360 | struct list_head wdata_list; | |
2361 | int rc; | |
2362 | pid_t pid; | |
72432ffc PS |
2363 | |
2364 | len = iov_length(iov, nr_segs); | |
2365 | if (!len) | |
2366 | return 0; | |
2367 | ||
2368 | rc = generic_write_checks(file, poffset, &len, 0); | |
2369 | if (rc) | |
2370 | return rc; | |
2371 | ||
da82f7e7 | 2372 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2373 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2374 | open_file = file->private_data; |
da82f7e7 | 2375 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2376 | |
2377 | if (!tcon->ses->server->ops->async_writev) | |
2378 | return -ENOSYS; | |
2379 | ||
3af9d8f2 | 2380 | offset = *poffset; |
d4ffff1f PS |
2381 | |
2382 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2383 | pid = open_file->pid; | |
2384 | else | |
2385 | pid = current->tgid; | |
2386 | ||
72432ffc | 2387 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2388 | do { |
da82f7e7 JL |
2389 | size_t save_len; |
2390 | ||
2391 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2392 | wdata = cifs_writedata_alloc(nr_pages, | |
2393 | cifs_uncached_writev_complete); | |
2394 | if (!wdata) { | |
2395 | rc = -ENOMEM; | |
2396 | break; | |
2397 | } | |
2398 | ||
2399 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2400 | if (rc) { | |
2401 | kfree(wdata); | |
2402 | break; | |
2403 | } | |
2404 | ||
2405 | save_len = cur_len; | |
2406 | for (i = 0; i < nr_pages; i++) { | |
2407 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2408 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2409 | 0, copied); | |
72432ffc PS |
2410 | cur_len -= copied; |
2411 | iov_iter_advance(&it, copied); | |
72432ffc | 2412 | } |
72432ffc PS |
2413 | cur_len = save_len - cur_len; |
2414 | ||
da82f7e7 JL |
2415 | wdata->sync_mode = WB_SYNC_ALL; |
2416 | wdata->nr_pages = nr_pages; | |
2417 | wdata->offset = (__u64)offset; | |
2418 | wdata->cfile = cifsFileInfo_get(open_file); | |
2419 | wdata->pid = pid; | |
2420 | wdata->bytes = cur_len; | |
eddb079d JL |
2421 | wdata->pagesz = PAGE_SIZE; |
2422 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2423 | rc = cifs_uncached_retry_writev(wdata); |
2424 | if (rc) { | |
2425 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2426 | break; |
2427 | } | |
2428 | ||
da82f7e7 JL |
2429 | list_add_tail(&wdata->list, &wdata_list); |
2430 | offset += cur_len; | |
2431 | len -= cur_len; | |
72432ffc PS |
2432 | } while (len > 0); |
2433 | ||
da82f7e7 JL |
2434 | /* |
2435 | * If at least one write was successfully sent, then discard any rc | |
2436 | * value from the later writes. If the other write succeeds, then | |
2437 | * we'll end up returning whatever was written. If it fails, then | |
2438 | * we'll get a new rc value from that. | |
2439 | */ | |
2440 | if (!list_empty(&wdata_list)) | |
2441 | rc = 0; | |
2442 | ||
2443 | /* | |
2444 | * Wait for and collect replies for any successful sends in order of | |
2445 | * increasing offset. Once an error is hit or we get a fatal signal | |
2446 | * while waiting, then return without waiting for any more replies. | |
2447 | */ | |
2448 | restart_loop: | |
2449 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2450 | if (!rc) { | |
2451 | /* FIXME: freezable too? */ | |
2452 | rc = wait_for_completion_killable(&wdata->done); | |
2453 | if (rc) | |
2454 | rc = -EINTR; | |
2455 | else if (wdata->result) | |
2456 | rc = wdata->result; | |
2457 | else | |
2458 | total_written += wdata->bytes; | |
2459 | ||
2460 | /* resend call if it's a retryable error */ | |
2461 | if (rc == -EAGAIN) { | |
2462 | rc = cifs_uncached_retry_writev(wdata); | |
2463 | goto restart_loop; | |
2464 | } | |
2465 | } | |
2466 | list_del_init(&wdata->list); | |
2467 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2468 | } |
2469 | ||
da82f7e7 JL |
2470 | if (total_written > 0) |
2471 | *poffset += total_written; | |
72432ffc | 2472 | |
da82f7e7 JL |
2473 | cifs_stats_bytes_written(tcon, total_written); |
2474 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2475 | } |
2476 | ||
0b81c1c4 | 2477 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2478 | unsigned long nr_segs, loff_t pos) |
2479 | { | |
2480 | ssize_t written; | |
2481 | struct inode *inode; | |
2482 | ||
496ad9aa | 2483 | inode = file_inode(iocb->ki_filp); |
72432ffc PS |
2484 | |
2485 | /* | |
2486 | * BB - optimize the way when signing is disabled. We can drop this | |
2487 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2488 | * write request. | |
2489 | */ | |
2490 | ||
2491 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2492 | if (written > 0) { | |
2493 | CIFS_I(inode)->invalid_mapping = true; | |
2494 | iocb->ki_pos = pos; | |
2495 | } | |
2496 | ||
2497 | return written; | |
2498 | } | |
2499 | ||
579f9053 | 2500 | static ssize_t |
ca8aa29c PS |
2501 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, |
2502 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2503 | { |
579f9053 PS |
2504 | struct file *file = iocb->ki_filp; |
2505 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2506 | struct inode *inode = file->f_mapping->host; | |
2507 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2508 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2509 | ssize_t rc = -EACCES; | |
72432ffc | 2510 | |
579f9053 | 2511 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2512 | |
579f9053 PS |
2513 | sb_start_write(inode->i_sb); |
2514 | ||
2515 | /* | |
2516 | * We need to hold the sem to be sure nobody modifies lock list | |
2517 | * with a brlock that prevents writing. | |
2518 | */ | |
2519 | down_read(&cinode->lock_sem); | |
2520 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2521 | server->vals->exclusive_lock_type, NULL, | |
081c0414 | 2522 | CIFS_WRITE_OP)) { |
579f9053 PS |
2523 | mutex_lock(&inode->i_mutex); |
2524 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
ca8aa29c | 2525 | &iocb->ki_pos); |
579f9053 PS |
2526 | mutex_unlock(&inode->i_mutex); |
2527 | } | |
2528 | ||
2529 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2530 | ssize_t err; | |
2531 | ||
2532 | err = generic_write_sync(file, pos, rc); | |
2533 | if (err < 0 && rc > 0) | |
2534 | rc = err; | |
2535 | } | |
2536 | ||
2537 | up_read(&cinode->lock_sem); | |
2538 | sb_end_write(inode->i_sb); | |
2539 | return rc; | |
2540 | } | |
2541 | ||
2542 | ssize_t | |
2543 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2544 | unsigned long nr_segs, loff_t pos) | |
2545 | { | |
496ad9aa | 2546 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2547 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2548 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2549 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2550 | iocb->ki_filp->private_data; | |
2551 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2552 | ssize_t written; |
ca8aa29c | 2553 | |
88cf75aa PS |
2554 | if (cinode->clientCanCacheAll) { |
2555 | if (cap_unix(tcon->ses) && | |
2556 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
2557 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2558 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2559 | return cifs_writev(iocb, iov, nr_segs, pos); | |
25078105 | 2560 | } |
25078105 | 2561 | /* |
ca8aa29c PS |
2562 | * For non-oplocked files in strict cache mode we need to write the data |
2563 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2564 | * affected pages because it may cause a error with mandatory locks on | |
2565 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2566 | */ |
88cf75aa PS |
2567 | written = cifs_user_writev(iocb, iov, nr_segs, pos); |
2568 | if (written > 0 && cinode->clientCanCacheRead) { | |
2569 | /* | |
2570 | * Windows 7 server can delay breaking level2 oplock if a write | |
2571 | * request comes - break it on the client to prevent reading | |
2572 | * an old data. | |
2573 | */ | |
2574 | cifs_invalidate_mapping(inode); | |
2575 | cFYI(1, "Set no oplock for inode=%p after a write operation", | |
2576 | inode); | |
2577 | cinode->clientCanCacheRead = false; | |
2578 | } | |
2579 | return written; | |
72432ffc PS |
2580 | } |
2581 | ||
0471ca3f | 2582 | static struct cifs_readdata * |
f4e49cd2 | 2583 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2584 | { |
2585 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2586 | |
c5fab6f4 JL |
2587 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2588 | GFP_KERNEL); | |
0471ca3f | 2589 | if (rdata != NULL) { |
6993f74a | 2590 | kref_init(&rdata->refcount); |
1c892549 JL |
2591 | INIT_LIST_HEAD(&rdata->list); |
2592 | init_completion(&rdata->done); | |
0471ca3f | 2593 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2594 | } |
f4e49cd2 | 2595 | |
0471ca3f JL |
2596 | return rdata; |
2597 | } | |
2598 | ||
6993f74a JL |
2599 | void |
2600 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2601 | { |
6993f74a JL |
2602 | struct cifs_readdata *rdata = container_of(refcount, |
2603 | struct cifs_readdata, refcount); | |
2604 | ||
2605 | if (rdata->cfile) | |
2606 | cifsFileInfo_put(rdata->cfile); | |
2607 | ||
0471ca3f JL |
2608 | kfree(rdata); |
2609 | } | |
2610 | ||
1c892549 | 2611 | static int |
c5fab6f4 | 2612 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2613 | { |
2614 | int rc = 0; | |
c5fab6f4 | 2615 | struct page *page; |
1c892549 JL |
2616 | unsigned int i; |
2617 | ||
c5fab6f4 | 2618 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2619 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2620 | if (!page) { | |
2621 | rc = -ENOMEM; | |
2622 | break; | |
2623 | } | |
c5fab6f4 | 2624 | rdata->pages[i] = page; |
1c892549 JL |
2625 | } |
2626 | ||
2627 | if (rc) { | |
c5fab6f4 JL |
2628 | for (i = 0; i < nr_pages; i++) { |
2629 | put_page(rdata->pages[i]); | |
2630 | rdata->pages[i] = NULL; | |
1c892549 JL |
2631 | } |
2632 | } | |
2633 | return rc; | |
2634 | } | |
2635 | ||
2636 | static void | |
2637 | cifs_uncached_readdata_release(struct kref *refcount) | |
2638 | { | |
1c892549 JL |
2639 | struct cifs_readdata *rdata = container_of(refcount, |
2640 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2641 | unsigned int i; |
1c892549 | 2642 | |
c5fab6f4 JL |
2643 | for (i = 0; i < rdata->nr_pages; i++) { |
2644 | put_page(rdata->pages[i]); | |
2645 | rdata->pages[i] = NULL; | |
1c892549 JL |
2646 | } |
2647 | cifs_readdata_release(refcount); | |
2648 | } | |
2649 | ||
2a1bb138 JL |
2650 | static int |
2651 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2652 | { | |
2653 | int rc; | |
fc9c5966 PS |
2654 | struct TCP_Server_Info *server; |
2655 | ||
2656 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2657 | |
2658 | do { | |
2659 | if (rdata->cfile->invalidHandle) { | |
2660 | rc = cifs_reopen_file(rdata->cfile, true); | |
2661 | if (rc != 0) | |
2662 | continue; | |
2663 | } | |
fc9c5966 | 2664 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2665 | } while (rc == -EAGAIN); |
2666 | ||
2667 | return rc; | |
2668 | } | |
2669 | ||
1c892549 JL |
2670 | /** |
2671 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2672 | * @rdata: the readdata response with list of pages holding data | |
2673 | * @iov: vector in which we should copy the data | |
2674 | * @nr_segs: number of segments in vector | |
2675 | * @offset: offset into file of the first iovec | |
2676 | * @copied: used to return the amount of data copied to the iov | |
2677 | * | |
2678 | * This function copies data from a list of pages in a readdata response into | |
2679 | * an array of iovecs. It will first calculate where the data should go | |
2680 | * based on the info in the readdata and then copy the data into that spot. | |
2681 | */ | |
2682 | static ssize_t | |
2683 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2684 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2685 | { | |
2686 | int rc = 0; | |
2687 | struct iov_iter ii; | |
2688 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2689 | ssize_t remaining = rdata->bytes; |
2690 | unsigned char *pdata; | |
c5fab6f4 | 2691 | unsigned int i; |
1c892549 JL |
2692 | |
2693 | /* set up iov_iter and advance to the correct offset */ | |
2694 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2695 | iov_iter_advance(&ii, pos); | |
2696 | ||
2697 | *copied = 0; | |
c5fab6f4 | 2698 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2699 | ssize_t copy; |
c5fab6f4 | 2700 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2701 | |
2702 | /* copy a whole page or whatever's left */ | |
2703 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2704 | ||
2705 | /* ...but limit it to whatever space is left in the iov */ | |
2706 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2707 | ||
2708 | /* go while there's data to be copied and no errors */ | |
2709 | if (copy && !rc) { | |
2710 | pdata = kmap(page); | |
2711 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2712 | (int)copy); | |
2713 | kunmap(page); | |
2714 | if (!rc) { | |
2715 | *copied += copy; | |
2716 | remaining -= copy; | |
2717 | iov_iter_advance(&ii, copy); | |
2718 | } | |
2719 | } | |
1c892549 JL |
2720 | } |
2721 | ||
2722 | return rc; | |
2723 | } | |
2724 | ||
2725 | static void | |
2726 | cifs_uncached_readv_complete(struct work_struct *work) | |
2727 | { | |
2728 | struct cifs_readdata *rdata = container_of(work, | |
2729 | struct cifs_readdata, work); | |
1c892549 JL |
2730 | |
2731 | complete(&rdata->done); | |
2732 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2733 | } | |
2734 | ||
2735 | static int | |
8321fec4 JL |
2736 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2737 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2738 | { |
8321fec4 | 2739 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2740 | unsigned int i; |
2741 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2742 | struct kvec iov; |
1c892549 | 2743 | |
8321fec4 | 2744 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2745 | for (i = 0; i < nr_pages; i++) { |
2746 | struct page *page = rdata->pages[i]; | |
2747 | ||
8321fec4 | 2748 | if (len >= PAGE_SIZE) { |
1c892549 | 2749 | /* enough data to fill the page */ |
8321fec4 JL |
2750 | iov.iov_base = kmap(page); |
2751 | iov.iov_len = PAGE_SIZE; | |
2752 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2753 | i, iov.iov_base, iov.iov_len); | |
2754 | len -= PAGE_SIZE; | |
2755 | } else if (len > 0) { | |
1c892549 | 2756 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2757 | iov.iov_base = kmap(page); |
2758 | iov.iov_len = len; | |
2759 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2760 | i, iov.iov_base, iov.iov_len); | |
2761 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2762 | rdata->tailsz = len; | |
2763 | len = 0; | |
1c892549 JL |
2764 | } else { |
2765 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2766 | rdata->pages[i] = NULL; |
2767 | rdata->nr_pages--; | |
1c892549 | 2768 | put_page(page); |
8321fec4 | 2769 | continue; |
1c892549 | 2770 | } |
8321fec4 JL |
2771 | |
2772 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2773 | kunmap(page); | |
2774 | if (result < 0) | |
2775 | break; | |
2776 | ||
2777 | total_read += result; | |
1c892549 JL |
2778 | } |
2779 | ||
8321fec4 | 2780 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2781 | } |
2782 | ||
a70307ee PS |
2783 | static ssize_t |
2784 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2785 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2786 | { |
1c892549 | 2787 | ssize_t rc; |
a70307ee | 2788 | size_t len, cur_len; |
1c892549 JL |
2789 | ssize_t total_read = 0; |
2790 | loff_t offset = *poffset; | |
2791 | unsigned int npages; | |
1da177e4 | 2792 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2793 | struct cifs_tcon *tcon; |
1da177e4 | 2794 | struct cifsFileInfo *open_file; |
1c892549 JL |
2795 | struct cifs_readdata *rdata, *tmp; |
2796 | struct list_head rdata_list; | |
2797 | pid_t pid; | |
a70307ee PS |
2798 | |
2799 | if (!nr_segs) | |
2800 | return 0; | |
2801 | ||
2802 | len = iov_length(iov, nr_segs); | |
2803 | if (!len) | |
2804 | return 0; | |
1da177e4 | 2805 | |
1c892549 | 2806 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2807 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2808 | open_file = file->private_data; |
1c892549 | 2809 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2810 | |
fc9c5966 PS |
2811 | if (!tcon->ses->server->ops->async_readv) |
2812 | return -ENOSYS; | |
2813 | ||
d4ffff1f PS |
2814 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2815 | pid = open_file->pid; | |
2816 | else | |
2817 | pid = current->tgid; | |
2818 | ||
ad7a2926 | 2819 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2820 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2821 | |
1c892549 JL |
2822 | do { |
2823 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2824 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2825 | |
1c892549 JL |
2826 | /* allocate a readdata struct */ |
2827 | rdata = cifs_readdata_alloc(npages, | |
2828 | cifs_uncached_readv_complete); | |
2829 | if (!rdata) { | |
2830 | rc = -ENOMEM; | |
2831 | goto error; | |
1da177e4 | 2832 | } |
a70307ee | 2833 | |
c5fab6f4 | 2834 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2835 | if (rc) |
2836 | goto error; | |
2837 | ||
2838 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2839 | rdata->nr_pages = npages; |
1c892549 JL |
2840 | rdata->offset = offset; |
2841 | rdata->bytes = cur_len; | |
2842 | rdata->pid = pid; | |
8321fec4 JL |
2843 | rdata->pagesz = PAGE_SIZE; |
2844 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2845 | |
2846 | rc = cifs_retry_async_readv(rdata); | |
2847 | error: | |
2848 | if (rc) { | |
2849 | kref_put(&rdata->refcount, | |
2850 | cifs_uncached_readdata_release); | |
2851 | break; | |
2852 | } | |
2853 | ||
2854 | list_add_tail(&rdata->list, &rdata_list); | |
2855 | offset += cur_len; | |
2856 | len -= cur_len; | |
2857 | } while (len > 0); | |
2858 | ||
2859 | /* if at least one read request send succeeded, then reset rc */ | |
2860 | if (!list_empty(&rdata_list)) | |
2861 | rc = 0; | |
2862 | ||
2863 | /* the loop below should proceed in the order of increasing offsets */ | |
2864 | restart_loop: | |
2865 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2866 | if (!rc) { | |
2867 | ssize_t copied; | |
2868 | ||
2869 | /* FIXME: freezable sleep too? */ | |
2870 | rc = wait_for_completion_killable(&rdata->done); | |
2871 | if (rc) | |
2872 | rc = -EINTR; | |
2873 | else if (rdata->result) | |
2874 | rc = rdata->result; | |
2875 | else { | |
2876 | rc = cifs_readdata_to_iov(rdata, iov, | |
2877 | nr_segs, *poffset, | |
2878 | &copied); | |
2879 | total_read += copied; | |
2880 | } | |
2881 | ||
2882 | /* resend call if it's a retryable error */ | |
2883 | if (rc == -EAGAIN) { | |
2884 | rc = cifs_retry_async_readv(rdata); | |
2885 | goto restart_loop; | |
1da177e4 | 2886 | } |
1da177e4 | 2887 | } |
1c892549 JL |
2888 | list_del_init(&rdata->list); |
2889 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2890 | } |
a70307ee | 2891 | |
1c892549 JL |
2892 | cifs_stats_bytes_read(tcon, total_read); |
2893 | *poffset += total_read; | |
2894 | ||
09a4707e PS |
2895 | /* mask nodata case */ |
2896 | if (rc == -ENODATA) | |
2897 | rc = 0; | |
2898 | ||
1c892549 | 2899 | return total_read ? total_read : rc; |
1da177e4 LT |
2900 | } |
2901 | ||
0b81c1c4 | 2902 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2903 | unsigned long nr_segs, loff_t pos) |
2904 | { | |
2905 | ssize_t read; | |
2906 | ||
2907 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2908 | if (read > 0) | |
2909 | iocb->ki_pos = pos; | |
2910 | ||
2911 | return read; | |
2912 | } | |
2913 | ||
579f9053 PS |
2914 | ssize_t |
2915 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2916 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2917 | { |
496ad9aa | 2918 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2919 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2920 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2921 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2922 | iocb->ki_filp->private_data; | |
2923 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2924 | int rc = -EACCES; | |
a70307ee PS |
2925 | |
2926 | /* | |
2927 | * In strict cache mode we need to read from the server all the time | |
2928 | * if we don't have level II oplock because the server can delay mtime | |
2929 | * change - so we can't make a decision about inode invalidating. | |
2930 | * And we can also fail with pagereading if there are mandatory locks | |
2931 | * on pages affected by this read but not on the region from pos to | |
2932 | * pos+len-1. | |
2933 | */ | |
579f9053 PS |
2934 | if (!cinode->clientCanCacheRead) |
2935 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2936 | |
579f9053 PS |
2937 | if (cap_unix(tcon->ses) && |
2938 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2939 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2940 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2941 | ||
2942 | /* | |
2943 | * We need to hold the sem to be sure nobody modifies lock list | |
2944 | * with a brlock that prevents reading. | |
2945 | */ | |
2946 | down_read(&cinode->lock_sem); | |
2947 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2948 | tcon->ses->server->vals->shared_lock_type, | |
081c0414 | 2949 | NULL, CIFS_READ_OP)) |
579f9053 PS |
2950 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); |
2951 | up_read(&cinode->lock_sem); | |
2952 | return rc; | |
a70307ee | 2953 | } |
1da177e4 | 2954 | |
f9c6e234 PS |
2955 | static ssize_t |
2956 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2957 | { |
2958 | int rc = -EACCES; | |
2959 | unsigned int bytes_read = 0; | |
2960 | unsigned int total_read; | |
2961 | unsigned int current_read_size; | |
5eba8ab3 | 2962 | unsigned int rsize; |
1da177e4 | 2963 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2964 | struct cifs_tcon *tcon; |
f9c6e234 | 2965 | struct TCP_Server_Info *server; |
6d5786a3 | 2966 | unsigned int xid; |
f9c6e234 | 2967 | char *cur_offset; |
1da177e4 | 2968 | struct cifsFileInfo *open_file; |
d4ffff1f | 2969 | struct cifs_io_parms io_parms; |
ec637e3f | 2970 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2971 | __u32 pid; |
1da177e4 | 2972 | |
6d5786a3 | 2973 | xid = get_xid(); |
e6a00296 | 2974 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2975 | |
5eba8ab3 JL |
2976 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2977 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2978 | ||
1da177e4 | 2979 | if (file->private_data == NULL) { |
0f3bc09e | 2980 | rc = -EBADF; |
6d5786a3 | 2981 | free_xid(xid); |
0f3bc09e | 2982 | return rc; |
1da177e4 | 2983 | } |
c21dfb69 | 2984 | open_file = file->private_data; |
29e20f9c | 2985 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2986 | server = tcon->ses->server; |
2987 | ||
2988 | if (!server->ops->sync_read) { | |
2989 | free_xid(xid); | |
2990 | return -ENOSYS; | |
2991 | } | |
1da177e4 | 2992 | |
d4ffff1f PS |
2993 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2994 | pid = open_file->pid; | |
2995 | else | |
2996 | pid = current->tgid; | |
2997 | ||
1da177e4 | 2998 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2999 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 3000 | |
f9c6e234 PS |
3001 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3002 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 3003 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
3004 | /* |
3005 | * For windows me and 9x we do not want to request more than it | |
3006 | * negotiated since it will refuse the read then. | |
3007 | */ | |
3008 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
3009 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 3010 | current_read_size = min_t(uint, current_read_size, |
c974befa | 3011 | CIFSMaxBufSize); |
f9f5c817 | 3012 | } |
1da177e4 LT |
3013 | rc = -EAGAIN; |
3014 | while (rc == -EAGAIN) { | |
cdff08e7 | 3015 | if (open_file->invalidHandle) { |
15886177 | 3016 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3017 | if (rc != 0) |
3018 | break; | |
3019 | } | |
d4ffff1f | 3020 | io_parms.pid = pid; |
29e20f9c | 3021 | io_parms.tcon = tcon; |
f9c6e234 | 3022 | io_parms.offset = *offset; |
d4ffff1f | 3023 | io_parms.length = current_read_size; |
f9c6e234 PS |
3024 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
3025 | &bytes_read, &cur_offset, | |
3026 | &buf_type); | |
1da177e4 LT |
3027 | } |
3028 | if (rc || (bytes_read == 0)) { | |
3029 | if (total_read) { | |
3030 | break; | |
3031 | } else { | |
6d5786a3 | 3032 | free_xid(xid); |
1da177e4 LT |
3033 | return rc; |
3034 | } | |
3035 | } else { | |
29e20f9c | 3036 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3037 | *offset += bytes_read; |
1da177e4 LT |
3038 | } |
3039 | } | |
6d5786a3 | 3040 | free_xid(xid); |
1da177e4 LT |
3041 | return total_read; |
3042 | } | |
3043 | ||
ca83ce3d JL |
3044 | /* |
3045 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3046 | * sure that it doesn't change while being written back. | |
3047 | */ | |
3048 | static int | |
3049 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3050 | { | |
3051 | struct page *page = vmf->page; | |
3052 | ||
3053 | lock_page(page); | |
3054 | return VM_FAULT_LOCKED; | |
3055 | } | |
3056 | ||
3057 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3058 | .fault = filemap_fault, | |
3059 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3060 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3061 | }; |
3062 | ||
7a6a19b1 PS |
3063 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3064 | { | |
3065 | int rc, xid; | |
496ad9aa | 3066 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3067 | |
6d5786a3 | 3068 | xid = get_xid(); |
7a6a19b1 | 3069 | |
6feb9891 PS |
3070 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3071 | rc = cifs_invalidate_mapping(inode); | |
3072 | if (rc) | |
3073 | return rc; | |
3074 | } | |
7a6a19b1 PS |
3075 | |
3076 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3077 | if (rc == 0) |
3078 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3079 | free_xid(xid); |
7a6a19b1 PS |
3080 | return rc; |
3081 | } | |
3082 | ||
1da177e4 LT |
3083 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3084 | { | |
1da177e4 LT |
3085 | int rc, xid; |
3086 | ||
6d5786a3 | 3087 | xid = get_xid(); |
abab095d | 3088 | rc = cifs_revalidate_file(file); |
1da177e4 | 3089 | if (rc) { |
b6b38f70 | 3090 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 3091 | free_xid(xid); |
1da177e4 LT |
3092 | return rc; |
3093 | } | |
3094 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3095 | if (rc == 0) |
3096 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3097 | free_xid(xid); |
1da177e4 LT |
3098 | return rc; |
3099 | } | |
3100 | ||
0471ca3f JL |
3101 | static void |
3102 | cifs_readv_complete(struct work_struct *work) | |
3103 | { | |
c5fab6f4 | 3104 | unsigned int i; |
0471ca3f JL |
3105 | struct cifs_readdata *rdata = container_of(work, |
3106 | struct cifs_readdata, work); | |
0471ca3f | 3107 | |
c5fab6f4 JL |
3108 | for (i = 0; i < rdata->nr_pages; i++) { |
3109 | struct page *page = rdata->pages[i]; | |
3110 | ||
0471ca3f JL |
3111 | lru_cache_add_file(page); |
3112 | ||
3113 | if (rdata->result == 0) { | |
0471ca3f JL |
3114 | flush_dcache_page(page); |
3115 | SetPageUptodate(page); | |
3116 | } | |
3117 | ||
3118 | unlock_page(page); | |
3119 | ||
3120 | if (rdata->result == 0) | |
3121 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3122 | ||
3123 | page_cache_release(page); | |
c5fab6f4 | 3124 | rdata->pages[i] = NULL; |
0471ca3f | 3125 | } |
6993f74a | 3126 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3127 | } |
3128 | ||
8d5ce4d2 | 3129 | static int |
8321fec4 JL |
3130 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3131 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3132 | { |
8321fec4 | 3133 | int total_read = 0, result = 0; |
c5fab6f4 | 3134 | unsigned int i; |
8d5ce4d2 JL |
3135 | u64 eof; |
3136 | pgoff_t eof_index; | |
c5fab6f4 | 3137 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3138 | struct kvec iov; |
8d5ce4d2 JL |
3139 | |
3140 | /* determine the eof that the server (probably) has */ | |
3141 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3142 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
3143 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
3144 | ||
8321fec4 | 3145 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3146 | for (i = 0; i < nr_pages; i++) { |
3147 | struct page *page = rdata->pages[i]; | |
3148 | ||
8321fec4 | 3149 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3150 | /* enough data to fill the page */ |
8321fec4 JL |
3151 | iov.iov_base = kmap(page); |
3152 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 3153 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3154 | i, page->index, iov.iov_base, iov.iov_len); |
3155 | len -= PAGE_CACHE_SIZE; | |
3156 | } else if (len > 0) { | |
8d5ce4d2 | 3157 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3158 | iov.iov_base = kmap(page); |
3159 | iov.iov_len = len; | |
8d5ce4d2 | 3160 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3161 | i, page->index, iov.iov_base, iov.iov_len); |
3162 | memset(iov.iov_base + len, | |
3163 | '\0', PAGE_CACHE_SIZE - len); | |
3164 | rdata->tailsz = len; | |
3165 | len = 0; | |
8d5ce4d2 JL |
3166 | } else if (page->index > eof_index) { |
3167 | /* | |
3168 | * The VFS will not try to do readahead past the | |
3169 | * i_size, but it's possible that we have outstanding | |
3170 | * writes with gaps in the middle and the i_size hasn't | |
3171 | * caught up yet. Populate those with zeroed out pages | |
3172 | * to prevent the VFS from repeatedly attempting to | |
3173 | * fill them until the writes are flushed. | |
3174 | */ | |
3175 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3176 | lru_cache_add_file(page); |
3177 | flush_dcache_page(page); | |
3178 | SetPageUptodate(page); | |
3179 | unlock_page(page); | |
3180 | page_cache_release(page); | |
c5fab6f4 JL |
3181 | rdata->pages[i] = NULL; |
3182 | rdata->nr_pages--; | |
8321fec4 | 3183 | continue; |
8d5ce4d2 JL |
3184 | } else { |
3185 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3186 | lru_cache_add_file(page); |
3187 | unlock_page(page); | |
3188 | page_cache_release(page); | |
c5fab6f4 JL |
3189 | rdata->pages[i] = NULL; |
3190 | rdata->nr_pages--; | |
8321fec4 | 3191 | continue; |
8d5ce4d2 | 3192 | } |
8321fec4 JL |
3193 | |
3194 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3195 | kunmap(page); | |
3196 | if (result < 0) | |
3197 | break; | |
3198 | ||
3199 | total_read += result; | |
8d5ce4d2 JL |
3200 | } |
3201 | ||
8321fec4 | 3202 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3203 | } |
3204 | ||
1da177e4 LT |
3205 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3206 | struct list_head *page_list, unsigned num_pages) | |
3207 | { | |
690c5e31 JL |
3208 | int rc; |
3209 | struct list_head tmplist; | |
3210 | struct cifsFileInfo *open_file = file->private_data; | |
3211 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3212 | unsigned int rsize = cifs_sb->rsize; | |
3213 | pid_t pid; | |
1da177e4 | 3214 | |
690c5e31 JL |
3215 | /* |
3216 | * Give up immediately if rsize is too small to read an entire page. | |
3217 | * The VFS will fall back to readpage. We should never reach this | |
3218 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3219 | * than a cache page. | |
3220 | */ | |
3221 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3222 | return 0; | |
bfa0d75a | 3223 | |
56698236 SJ |
3224 | /* |
3225 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3226 | * immediately if the cookie is negative | |
3227 | */ | |
3228 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3229 | &num_pages); | |
3230 | if (rc == 0) | |
690c5e31 | 3231 | return rc; |
56698236 | 3232 | |
d4ffff1f PS |
3233 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3234 | pid = open_file->pid; | |
3235 | else | |
3236 | pid = current->tgid; | |
3237 | ||
690c5e31 JL |
3238 | rc = 0; |
3239 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3240 | |
690c5e31 JL |
3241 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3242 | mapping, num_pages); | |
3243 | ||
3244 | /* | |
3245 | * Start with the page at end of list and move it to private | |
3246 | * list. Do the same with any following pages until we hit | |
3247 | * the rsize limit, hit an index discontinuity, or run out of | |
3248 | * pages. Issue the async read and then start the loop again | |
3249 | * until the list is empty. | |
3250 | * | |
3251 | * Note that list order is important. The page_list is in | |
3252 | * the order of declining indexes. When we put the pages in | |
3253 | * the rdata->pages, then we want them in increasing order. | |
3254 | */ | |
3255 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3256 | unsigned int i; |
690c5e31 JL |
3257 | unsigned int bytes = PAGE_CACHE_SIZE; |
3258 | unsigned int expected_index; | |
3259 | unsigned int nr_pages = 1; | |
3260 | loff_t offset; | |
3261 | struct page *page, *tpage; | |
3262 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3263 | |
3264 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3265 | |
3266 | /* | |
3267 | * Lock the page and put it in the cache. Since no one else | |
3268 | * should have access to this page, we're safe to simply set | |
3269 | * PG_locked without checking it first. | |
3270 | */ | |
3271 | __set_page_locked(page); | |
3272 | rc = add_to_page_cache_locked(page, mapping, | |
3273 | page->index, GFP_KERNEL); | |
3274 | ||
3275 | /* give up if we can't stick it in the cache */ | |
3276 | if (rc) { | |
3277 | __clear_page_locked(page); | |
3278 | break; | |
3279 | } | |
3280 | ||
3281 | /* move first page to the tmplist */ | |
1da177e4 | 3282 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3283 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3284 | |
690c5e31 JL |
3285 | /* now try and add more pages onto the request */ |
3286 | expected_index = page->index + 1; | |
3287 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3288 | /* discontinuity ? */ | |
3289 | if (page->index != expected_index) | |
fb8c4b14 | 3290 | break; |
690c5e31 JL |
3291 | |
3292 | /* would this page push the read over the rsize? */ | |
3293 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3294 | break; | |
3295 | ||
3296 | __set_page_locked(page); | |
3297 | if (add_to_page_cache_locked(page, mapping, | |
3298 | page->index, GFP_KERNEL)) { | |
3299 | __clear_page_locked(page); | |
3300 | break; | |
3301 | } | |
3302 | list_move_tail(&page->lru, &tmplist); | |
3303 | bytes += PAGE_CACHE_SIZE; | |
3304 | expected_index++; | |
3305 | nr_pages++; | |
1da177e4 | 3306 | } |
690c5e31 | 3307 | |
0471ca3f | 3308 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3309 | if (!rdata) { |
3310 | /* best to give up if we're out of mem */ | |
3311 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3312 | list_del(&page->lru); | |
3313 | lru_cache_add_file(page); | |
3314 | unlock_page(page); | |
3315 | page_cache_release(page); | |
3316 | } | |
3317 | rc = -ENOMEM; | |
3318 | break; | |
3319 | } | |
3320 | ||
6993f74a | 3321 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3322 | rdata->mapping = mapping; |
3323 | rdata->offset = offset; | |
3324 | rdata->bytes = bytes; | |
3325 | rdata->pid = pid; | |
8321fec4 JL |
3326 | rdata->pagesz = PAGE_CACHE_SIZE; |
3327 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3328 | |
3329 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3330 | list_del(&page->lru); | |
3331 | rdata->pages[rdata->nr_pages++] = page; | |
3332 | } | |
690c5e31 | 3333 | |
2a1bb138 | 3334 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3335 | if (rc != 0) { |
c5fab6f4 JL |
3336 | for (i = 0; i < rdata->nr_pages; i++) { |
3337 | page = rdata->pages[i]; | |
690c5e31 JL |
3338 | lru_cache_add_file(page); |
3339 | unlock_page(page); | |
3340 | page_cache_release(page); | |
1da177e4 | 3341 | } |
6993f74a | 3342 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3343 | break; |
3344 | } | |
6993f74a JL |
3345 | |
3346 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3347 | } |
3348 | ||
1da177e4 LT |
3349 | return rc; |
3350 | } | |
3351 | ||
3352 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3353 | loff_t *poffset) | |
3354 | { | |
3355 | char *read_data; | |
3356 | int rc; | |
3357 | ||
56698236 | 3358 | /* Is the page cached? */ |
496ad9aa | 3359 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3360 | if (rc == 0) |
3361 | goto read_complete; | |
3362 | ||
1da177e4 LT |
3363 | page_cache_get(page); |
3364 | read_data = kmap(page); | |
3365 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3366 | |
1da177e4 | 3367 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3368 | |
1da177e4 LT |
3369 | if (rc < 0) |
3370 | goto io_error; | |
3371 | else | |
b6b38f70 | 3372 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3373 | |
496ad9aa AV |
3374 | file_inode(file)->i_atime = |
3375 | current_fs_time(file_inode(file)->i_sb); | |
fb8c4b14 | 3376 | |
1da177e4 LT |
3377 | if (PAGE_CACHE_SIZE > rc) |
3378 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3379 | ||
3380 | flush_dcache_page(page); | |
3381 | SetPageUptodate(page); | |
9dc06558 SJ |
3382 | |
3383 | /* send this page to the cache */ | |
496ad9aa | 3384 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3385 | |
1da177e4 | 3386 | rc = 0; |
fb8c4b14 | 3387 | |
1da177e4 | 3388 | io_error: |
fb8c4b14 | 3389 | kunmap(page); |
1da177e4 | 3390 | page_cache_release(page); |
56698236 SJ |
3391 | |
3392 | read_complete: | |
1da177e4 LT |
3393 | return rc; |
3394 | } | |
3395 | ||
3396 | static int cifs_readpage(struct file *file, struct page *page) | |
3397 | { | |
3398 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3399 | int rc = -EACCES; | |
6d5786a3 | 3400 | unsigned int xid; |
1da177e4 | 3401 | |
6d5786a3 | 3402 | xid = get_xid(); |
1da177e4 LT |
3403 | |
3404 | if (file->private_data == NULL) { | |
0f3bc09e | 3405 | rc = -EBADF; |
6d5786a3 | 3406 | free_xid(xid); |
0f3bc09e | 3407 | return rc; |
1da177e4 LT |
3408 | } |
3409 | ||
ac3aa2f8 | 3410 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3411 | page, (int)offset, (int)offset); |
1da177e4 LT |
3412 | |
3413 | rc = cifs_readpage_worker(file, page, &offset); | |
3414 | ||
3415 | unlock_page(page); | |
3416 | ||
6d5786a3 | 3417 | free_xid(xid); |
1da177e4 LT |
3418 | return rc; |
3419 | } | |
3420 | ||
a403a0a3 SF |
3421 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3422 | { | |
3423 | struct cifsFileInfo *open_file; | |
3424 | ||
4477288a | 3425 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3426 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3427 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3428 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3429 | return 1; |
3430 | } | |
3431 | } | |
4477288a | 3432 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3433 | return 0; |
3434 | } | |
3435 | ||
1da177e4 LT |
3436 | /* We do not want to update the file size from server for inodes |
3437 | open for write - to avoid races with writepage extending | |
3438 | the file - in the future we could consider allowing | |
fb8c4b14 | 3439 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3440 | but this is tricky to do without racing with writebehind |
3441 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3442 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3443 | { |
a403a0a3 | 3444 | if (!cifsInode) |
4b18f2a9 | 3445 | return true; |
50c2f753 | 3446 | |
a403a0a3 SF |
3447 | if (is_inode_writable(cifsInode)) { |
3448 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3449 | struct cifs_sb_info *cifs_sb; |
3450 | ||
c32a0b68 | 3451 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3452 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3453 | /* since no page cache to corrupt on directio |
c32a0b68 | 3454 | we can change size safely */ |
4b18f2a9 | 3455 | return true; |
c32a0b68 SF |
3456 | } |
3457 | ||
fb8c4b14 | 3458 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3459 | return true; |
7ba52631 | 3460 | |
4b18f2a9 | 3461 | return false; |
23e7dd7d | 3462 | } else |
4b18f2a9 | 3463 | return true; |
1da177e4 LT |
3464 | } |
3465 | ||
d9414774 NP |
3466 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3467 | loff_t pos, unsigned len, unsigned flags, | |
3468 | struct page **pagep, void **fsdata) | |
1da177e4 | 3469 | { |
d9414774 NP |
3470 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3471 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3472 | loff_t page_start = pos & PAGE_MASK; |
3473 | loff_t i_size; | |
3474 | struct page *page; | |
3475 | int rc = 0; | |
d9414774 | 3476 | |
b6b38f70 | 3477 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3478 | |
54566b2c | 3479 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3480 | if (!page) { |
3481 | rc = -ENOMEM; | |
3482 | goto out; | |
3483 | } | |
8a236264 | 3484 | |
a98ee8c1 JL |
3485 | if (PageUptodate(page)) |
3486 | goto out; | |
8a236264 | 3487 | |
a98ee8c1 JL |
3488 | /* |
3489 | * If we write a full page it will be up to date, no need to read from | |
3490 | * the server. If the write is short, we'll end up doing a sync write | |
3491 | * instead. | |
3492 | */ | |
3493 | if (len == PAGE_CACHE_SIZE) | |
3494 | goto out; | |
8a236264 | 3495 | |
a98ee8c1 JL |
3496 | /* |
3497 | * optimize away the read when we have an oplock, and we're not | |
3498 | * expecting to use any of the data we'd be reading in. That | |
3499 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3500 | * and the write will cover all of the existing data. | |
3501 | */ | |
3502 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3503 | i_size = i_size_read(mapping->host); | |
3504 | if (page_start >= i_size || | |
3505 | (offset == 0 && (pos + len) >= i_size)) { | |
3506 | zero_user_segments(page, 0, offset, | |
3507 | offset + len, | |
3508 | PAGE_CACHE_SIZE); | |
3509 | /* | |
3510 | * PageChecked means that the parts of the page | |
3511 | * to which we're not writing are considered up | |
3512 | * to date. Once the data is copied to the | |
3513 | * page, it can be set uptodate. | |
3514 | */ | |
3515 | SetPageChecked(page); | |
3516 | goto out; | |
3517 | } | |
3518 | } | |
d9414774 | 3519 | |
a98ee8c1 JL |
3520 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3521 | /* | |
3522 | * might as well read a page, it is fast enough. If we get | |
3523 | * an error, we don't need to return it. cifs_write_end will | |
3524 | * do a sync write instead since PG_uptodate isn't set. | |
3525 | */ | |
3526 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3527 | } else { |
3528 | /* we could try using another file handle if there is one - | |
3529 | but how would we lock it to prevent close of that handle | |
3530 | racing with this read? In any case | |
d9414774 | 3531 | this will be written out by write_end so is fine */ |
1da177e4 | 3532 | } |
a98ee8c1 JL |
3533 | out: |
3534 | *pagep = page; | |
3535 | return rc; | |
1da177e4 LT |
3536 | } |
3537 | ||
85f2d6b4 SJ |
3538 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3539 | { | |
3540 | if (PagePrivate(page)) | |
3541 | return 0; | |
3542 | ||
3543 | return cifs_fscache_release_page(page, gfp); | |
3544 | } | |
3545 | ||
3546 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3547 | { | |
3548 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3549 | ||
3550 | if (offset == 0) | |
3551 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3552 | } | |
3553 | ||
9ad1506b PS |
3554 | static int cifs_launder_page(struct page *page) |
3555 | { | |
3556 | int rc = 0; | |
3557 | loff_t range_start = page_offset(page); | |
3558 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3559 | struct writeback_control wbc = { | |
3560 | .sync_mode = WB_SYNC_ALL, | |
3561 | .nr_to_write = 0, | |
3562 | .range_start = range_start, | |
3563 | .range_end = range_end, | |
3564 | }; | |
3565 | ||
3566 | cFYI(1, "Launder page: %p", page); | |
3567 | ||
3568 | if (clear_page_dirty_for_io(page)) | |
3569 | rc = cifs_writepage_locked(page, &wbc); | |
3570 | ||
3571 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3572 | return rc; | |
3573 | } | |
3574 | ||
9b646972 | 3575 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3576 | { |
3577 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3578 | oplock_break); | |
a5e18bc3 | 3579 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3580 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3581 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3582 | int rc = 0; |
3bc303c2 | 3583 | |
63b7d3a4 PS |
3584 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead && |
3585 | cifs_has_mand_locks(cinode)) { | |
3586 | cFYI(1, "Reset oplock to None for inode=%p due to mand locks", | |
3587 | inode); | |
3588 | cinode->clientCanCacheRead = false; | |
3589 | } | |
3590 | ||
3bc303c2 | 3591 | if (inode && S_ISREG(inode->i_mode)) { |
d54ff732 | 3592 | if (cinode->clientCanCacheRead) |
8737c930 | 3593 | break_lease(inode, O_RDONLY); |
d54ff732 | 3594 | else |
8737c930 | 3595 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3596 | rc = filemap_fdatawrite(inode->i_mapping); |
3597 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3598 | rc = filemap_fdatawait(inode->i_mapping); |
3599 | mapping_set_error(inode->i_mapping, rc); | |
03eca704 | 3600 | cifs_invalidate_mapping(inode); |
3bc303c2 | 3601 | } |
b6b38f70 | 3602 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3603 | } |
3604 | ||
85160e03 PS |
3605 | rc = cifs_push_locks(cfile); |
3606 | if (rc) | |
3607 | cERROR(1, "Push locks rc = %d", rc); | |
3608 | ||
3bc303c2 JL |
3609 | /* |
3610 | * releasing stale oplock after recent reconnect of smb session using | |
3611 | * a now incorrect file handle is not a data integrity issue but do | |
3612 | * not bother sending an oplock release if session to server still is | |
3613 | * disconnected since oplock already released by the server | |
3614 | */ | |
cdff08e7 | 3615 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3616 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3617 | cinode); | |
b6b38f70 | 3618 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3619 | } |
3bc303c2 JL |
3620 | } |
3621 | ||
f5e54d6e | 3622 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3623 | .readpage = cifs_readpage, |
3624 | .readpages = cifs_readpages, | |
3625 | .writepage = cifs_writepage, | |
37c0eb46 | 3626 | .writepages = cifs_writepages, |
d9414774 NP |
3627 | .write_begin = cifs_write_begin, |
3628 | .write_end = cifs_write_end, | |
1da177e4 | 3629 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3630 | .releasepage = cifs_release_page, |
3631 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3632 | .launder_page = cifs_launder_page, |
1da177e4 | 3633 | }; |
273d81d6 DK |
3634 | |
3635 | /* | |
3636 | * cifs_readpages requires the server to support a buffer large enough to | |
3637 | * contain the header plus one complete page of data. Otherwise, we need | |
3638 | * to leave cifs_readpages out of the address space operations. | |
3639 | */ | |
f5e54d6e | 3640 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3641 | .readpage = cifs_readpage, |
3642 | .writepage = cifs_writepage, | |
3643 | .writepages = cifs_writepages, | |
d9414774 NP |
3644 | .write_begin = cifs_write_begin, |
3645 | .write_end = cifs_write_end, | |
273d81d6 | 3646 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3647 | .releasepage = cifs_release_page, |
3648 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3649 | .launder_page = cifs_launder_page, |
273d81d6 | 3650 | }; |