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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
07b92d0d | 46 | |
1da177e4 LT |
47 | static inline int cifs_convert_flags(unsigned int flags) |
48 | { | |
49 | if ((flags & O_ACCMODE) == O_RDONLY) | |
50 | return GENERIC_READ; | |
51 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
52 | return GENERIC_WRITE; | |
53 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
54 | /* GENERIC_ALL is too much permission to request | |
55 | can cause unnecessary access denied on create */ | |
56 | /* return GENERIC_ALL; */ | |
57 | return (GENERIC_READ | GENERIC_WRITE); | |
58 | } | |
59 | ||
e10f7b55 JL |
60 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
61 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
62 | FILE_READ_DATA); | |
7fc8f4e9 | 63 | } |
e10f7b55 | 64 | |
608712fe | 65 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 66 | { |
608712fe | 67 | u32 posix_flags = 0; |
e10f7b55 | 68 | |
7fc8f4e9 | 69 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 70 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 71 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
72 | posix_flags = SMB_O_WRONLY; |
73 | else if ((flags & O_ACCMODE) == O_RDWR) | |
74 | posix_flags = SMB_O_RDWR; | |
75 | ||
07b92d0d | 76 | if (flags & O_CREAT) { |
608712fe | 77 | posix_flags |= SMB_O_CREAT; |
07b92d0d SF |
78 | if (flags & O_EXCL) |
79 | posix_flags |= SMB_O_EXCL; | |
80 | } else if (flags & O_EXCL) | |
f96637be JP |
81 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
82 | current->comm, current->tgid); | |
07b92d0d | 83 | |
608712fe JL |
84 | if (flags & O_TRUNC) |
85 | posix_flags |= SMB_O_TRUNC; | |
86 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 87 | if (flags & O_DSYNC) |
608712fe | 88 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 89 | if (flags & O_DIRECTORY) |
608712fe | 90 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 91 | if (flags & O_NOFOLLOW) |
608712fe | 92 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 93 | if (flags & O_DIRECT) |
608712fe | 94 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
95 | |
96 | return posix_flags; | |
1da177e4 LT |
97 | } |
98 | ||
99 | static inline int cifs_get_disposition(unsigned int flags) | |
100 | { | |
101 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
102 | return FILE_CREATE; | |
103 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
104 | return FILE_OVERWRITE_IF; | |
105 | else if ((flags & O_CREAT) == O_CREAT) | |
106 | return FILE_OPEN_IF; | |
55aa2e09 SF |
107 | else if ((flags & O_TRUNC) == O_TRUNC) |
108 | return FILE_OVERWRITE; | |
1da177e4 LT |
109 | else |
110 | return FILE_OPEN; | |
111 | } | |
112 | ||
608712fe JL |
113 | int cifs_posix_open(char *full_path, struct inode **pinode, |
114 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 115 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
116 | { |
117 | int rc; | |
118 | FILE_UNIX_BASIC_INFO *presp_data; | |
119 | __u32 posix_flags = 0; | |
120 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
121 | struct cifs_fattr fattr; | |
122 | struct tcon_link *tlink; | |
96daf2b0 | 123 | struct cifs_tcon *tcon; |
608712fe | 124 | |
f96637be | 125 | cifs_dbg(FYI, "posix open %s\n", full_path); |
608712fe JL |
126 | |
127 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
128 | if (presp_data == NULL) | |
129 | return -ENOMEM; | |
130 | ||
131 | tlink = cifs_sb_tlink(cifs_sb); | |
132 | if (IS_ERR(tlink)) { | |
133 | rc = PTR_ERR(tlink); | |
134 | goto posix_open_ret; | |
135 | } | |
136 | ||
137 | tcon = tlink_tcon(tlink); | |
138 | mode &= ~current_umask(); | |
139 | ||
140 | posix_flags = cifs_posix_convert_flags(f_flags); | |
141 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
142 | poplock, full_path, cifs_sb->local_nls, | |
bc8ebdc4 | 143 | cifs_remap(cifs_sb)); |
608712fe JL |
144 | cifs_put_tlink(tlink); |
145 | ||
146 | if (rc) | |
147 | goto posix_open_ret; | |
148 | ||
149 | if (presp_data->Type == cpu_to_le32(-1)) | |
150 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
151 | ||
152 | if (!pinode) | |
153 | goto posix_open_ret; /* caller does not need info */ | |
154 | ||
155 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
156 | ||
157 | /* get new inode and set it up */ | |
158 | if (*pinode == NULL) { | |
159 | cifs_fill_uniqueid(sb, &fattr); | |
160 | *pinode = cifs_iget(sb, &fattr); | |
161 | if (!*pinode) { | |
162 | rc = -ENOMEM; | |
163 | goto posix_open_ret; | |
164 | } | |
165 | } else { | |
166 | cifs_fattr_to_inode(*pinode, &fattr); | |
167 | } | |
168 | ||
169 | posix_open_ret: | |
170 | kfree(presp_data); | |
171 | return rc; | |
172 | } | |
173 | ||
eeb910a6 PS |
174 | static int |
175 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
176 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
177 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
178 | { |
179 | int rc; | |
fb1214e4 | 180 | int desired_access; |
eeb910a6 | 181 | int disposition; |
3d3ea8e6 | 182 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 183 | FILE_ALL_INFO *buf; |
b8c32dbb | 184 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 185 | struct cifs_open_parms oparms; |
eeb910a6 | 186 | |
b8c32dbb | 187 | if (!server->ops->open) |
fb1214e4 PS |
188 | return -ENOSYS; |
189 | ||
190 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
191 | |
192 | /********************************************************************* | |
193 | * open flag mapping table: | |
194 | * | |
195 | * POSIX Flag CIFS Disposition | |
196 | * ---------- ---------------- | |
197 | * O_CREAT FILE_OPEN_IF | |
198 | * O_CREAT | O_EXCL FILE_CREATE | |
199 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
200 | * O_TRUNC FILE_OVERWRITE | |
201 | * none of the above FILE_OPEN | |
202 | * | |
203 | * Note that there is not a direct match between disposition | |
204 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
205 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
206 | * file rather than creating a new file as FILE_SUPERSEDE does | |
207 | * (which uses the attributes / metadata passed in on open call) | |
208 | *? | |
209 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
210 | *? and the read write flags match reasonably. O_LARGEFILE | |
211 | *? is irrelevant because largefile support is always used | |
212 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
213 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
214 | *********************************************************************/ | |
215 | ||
216 | disposition = cifs_get_disposition(f_flags); | |
217 | ||
218 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
219 | ||
220 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
221 | if (!buf) | |
222 | return -ENOMEM; | |
223 | ||
3d3ea8e6 SP |
224 | if (backup_cred(cifs_sb)) |
225 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
226 | ||
1013e760 SF |
227 | /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
228 | if (f_flags & O_SYNC) | |
229 | create_options |= CREATE_WRITE_THROUGH; | |
230 | ||
231 | if (f_flags & O_DIRECT) | |
232 | create_options |= CREATE_NO_BUFFER; | |
233 | ||
226730b4 PS |
234 | oparms.tcon = tcon; |
235 | oparms.cifs_sb = cifs_sb; | |
236 | oparms.desired_access = desired_access; | |
237 | oparms.create_options = create_options; | |
238 | oparms.disposition = disposition; | |
239 | oparms.path = full_path; | |
240 | oparms.fid = fid; | |
9cbc0b73 | 241 | oparms.reconnect = false; |
226730b4 PS |
242 | |
243 | rc = server->ops->open(xid, &oparms, oplock, buf); | |
eeb910a6 PS |
244 | |
245 | if (rc) | |
246 | goto out; | |
247 | ||
248 | if (tcon->unix_ext) | |
249 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
250 | xid); | |
251 | else | |
252 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
42eacf9e | 253 | xid, fid); |
eeb910a6 PS |
254 | |
255 | out: | |
256 | kfree(buf); | |
257 | return rc; | |
258 | } | |
259 | ||
63b7d3a4 PS |
260 | static bool |
261 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
262 | { | |
263 | struct cifs_fid_locks *cur; | |
264 | bool has_locks = false; | |
265 | ||
266 | down_read(&cinode->lock_sem); | |
267 | list_for_each_entry(cur, &cinode->llist, llist) { | |
268 | if (!list_empty(&cur->locks)) { | |
269 | has_locks = true; | |
270 | break; | |
271 | } | |
272 | } | |
273 | up_read(&cinode->lock_sem); | |
274 | return has_locks; | |
275 | } | |
276 | ||
15ecb436 | 277 | struct cifsFileInfo * |
fb1214e4 | 278 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
279 | struct tcon_link *tlink, __u32 oplock) |
280 | { | |
1f1735cb | 281 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 282 | struct inode *inode = d_inode(dentry); |
4b4de76e PS |
283 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
284 | struct cifsFileInfo *cfile; | |
f45d3416 | 285 | struct cifs_fid_locks *fdlocks; |
233839b1 | 286 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 287 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
288 | |
289 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
290 | if (cfile == NULL) | |
291 | return cfile; | |
292 | ||
f45d3416 PS |
293 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
294 | if (!fdlocks) { | |
295 | kfree(cfile); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | INIT_LIST_HEAD(&fdlocks->locks); | |
300 | fdlocks->cfile = cfile; | |
301 | cfile->llist = fdlocks; | |
1b4b55a1 | 302 | down_write(&cinode->lock_sem); |
f45d3416 | 303 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 304 | up_write(&cinode->lock_sem); |
f45d3416 | 305 | |
4b4de76e | 306 | cfile->count = 1; |
4b4de76e PS |
307 | cfile->pid = current->tgid; |
308 | cfile->uid = current_fsuid(); | |
309 | cfile->dentry = dget(dentry); | |
310 | cfile->f_flags = file->f_flags; | |
311 | cfile->invalidHandle = false; | |
312 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 313 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 314 | mutex_init(&cfile->fh_mutex); |
3afca265 | 315 | spin_lock_init(&cfile->file_info_lock); |
15ecb436 | 316 | |
24261fc2 MG |
317 | cifs_sb_active(inode->i_sb); |
318 | ||
63b7d3a4 PS |
319 | /* |
320 | * If the server returned a read oplock and we have mandatory brlocks, | |
321 | * set oplock level to None. | |
322 | */ | |
53ef1016 | 323 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
f96637be | 324 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
325 | oplock = 0; |
326 | } | |
327 | ||
3afca265 | 328 | spin_lock(&tcon->open_file_lock); |
63b7d3a4 | 329 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
330 | oplock = fid->pending_open->oplock; |
331 | list_del(&fid->pending_open->olist); | |
332 | ||
42873b0a | 333 | fid->purge_cache = false; |
63b7d3a4 | 334 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
335 | |
336 | list_add(&cfile->tlist, &tcon->openFileList); | |
3afca265 | 337 | |
15ecb436 JL |
338 | /* if readable file instance put first in list*/ |
339 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 340 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 341 | else |
4b4de76e | 342 | list_add_tail(&cfile->flist, &cinode->openFileList); |
3afca265 | 343 | spin_unlock(&tcon->open_file_lock); |
15ecb436 | 344 | |
42873b0a | 345 | if (fid->purge_cache) |
4f73c7d3 | 346 | cifs_zap_mapping(inode); |
42873b0a | 347 | |
4b4de76e PS |
348 | file->private_data = cfile; |
349 | return cfile; | |
15ecb436 JL |
350 | } |
351 | ||
764a1b1a JL |
352 | struct cifsFileInfo * |
353 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
354 | { | |
3afca265 | 355 | spin_lock(&cifs_file->file_info_lock); |
764a1b1a | 356 | cifsFileInfo_get_locked(cifs_file); |
3afca265 | 357 | spin_unlock(&cifs_file->file_info_lock); |
764a1b1a JL |
358 | return cifs_file; |
359 | } | |
360 | ||
cdff08e7 SF |
361 | /* |
362 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e | 363 | * the filehandle out on the server. Must be called without holding |
3afca265 | 364 | * tcon->open_file_lock and cifs_file->file_info_lock. |
cdff08e7 | 365 | */ |
b33879aa JL |
366 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
367 | { | |
2b0143b5 | 368 | struct inode *inode = d_inode(cifs_file->dentry); |
96daf2b0 | 369 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 370 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 371 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
372 | struct super_block *sb = inode->i_sb; |
373 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cdff08e7 | 374 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
375 | struct cifs_fid fid; |
376 | struct cifs_pending_open open; | |
ca7df8e0 | 377 | bool oplock_break_cancelled; |
cdff08e7 | 378 | |
3afca265 SF |
379 | spin_lock(&tcon->open_file_lock); |
380 | ||
381 | spin_lock(&cifs_file->file_info_lock); | |
5f6dbc9e | 382 | if (--cifs_file->count > 0) { |
3afca265 SF |
383 | spin_unlock(&cifs_file->file_info_lock); |
384 | spin_unlock(&tcon->open_file_lock); | |
cdff08e7 SF |
385 | return; |
386 | } | |
3afca265 | 387 | spin_unlock(&cifs_file->file_info_lock); |
cdff08e7 | 388 | |
233839b1 PS |
389 | if (server->ops->get_lease_key) |
390 | server->ops->get_lease_key(inode, &fid); | |
391 | ||
392 | /* store open in pending opens to make sure we don't miss lease break */ | |
393 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
394 | ||
cdff08e7 SF |
395 | /* remove it from the lists */ |
396 | list_del(&cifs_file->flist); | |
397 | list_del(&cifs_file->tlist); | |
398 | ||
399 | if (list_empty(&cifsi->openFileList)) { | |
f96637be | 400 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
2b0143b5 | 401 | d_inode(cifs_file->dentry)); |
25364138 PS |
402 | /* |
403 | * In strict cache mode we need invalidate mapping on the last | |
404 | * close because it may cause a error when we open this file | |
405 | * again and get at least level II oplock. | |
406 | */ | |
4f8ba8a0 | 407 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
aff8d5ca | 408 | set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); |
c6723628 | 409 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 | 410 | } |
3afca265 SF |
411 | |
412 | spin_unlock(&tcon->open_file_lock); | |
cdff08e7 | 413 | |
ca7df8e0 | 414 | oplock_break_cancelled = cancel_work_sync(&cifs_file->oplock_break); |
ad635942 | 415 | |
cdff08e7 | 416 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 417 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 418 | unsigned int xid; |
0ff78a22 | 419 | |
6d5786a3 | 420 | xid = get_xid(); |
0ff78a22 | 421 | if (server->ops->close) |
760ad0ca PS |
422 | server->ops->close(xid, tcon, &cifs_file->fid); |
423 | _free_xid(xid); | |
cdff08e7 SF |
424 | } |
425 | ||
ca7df8e0 SP |
426 | if (oplock_break_cancelled) |
427 | cifs_done_oplock_break(cifsi); | |
428 | ||
233839b1 PS |
429 | cifs_del_pending_open(&open); |
430 | ||
f45d3416 PS |
431 | /* |
432 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
433 | * is closed anyway. |
434 | */ | |
1b4b55a1 | 435 | down_write(&cifsi->lock_sem); |
f45d3416 | 436 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 437 | list_del(&li->llist); |
85160e03 | 438 | cifs_del_lock_waiters(li); |
cdff08e7 | 439 | kfree(li); |
b33879aa | 440 | } |
f45d3416 PS |
441 | list_del(&cifs_file->llist->llist); |
442 | kfree(cifs_file->llist); | |
1b4b55a1 | 443 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
444 | |
445 | cifs_put_tlink(cifs_file->tlink); | |
446 | dput(cifs_file->dentry); | |
24261fc2 | 447 | cifs_sb_deactive(sb); |
cdff08e7 | 448 | kfree(cifs_file); |
b33879aa JL |
449 | } |
450 | ||
1da177e4 | 451 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 452 | |
1da177e4 LT |
453 | { |
454 | int rc = -EACCES; | |
6d5786a3 | 455 | unsigned int xid; |
590a3fe0 | 456 | __u32 oplock; |
1da177e4 | 457 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 458 | struct TCP_Server_Info *server; |
96daf2b0 | 459 | struct cifs_tcon *tcon; |
7ffec372 | 460 | struct tcon_link *tlink; |
fb1214e4 | 461 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 462 | char *full_path = NULL; |
7e12eddb | 463 | bool posix_open_ok = false; |
fb1214e4 | 464 | struct cifs_fid fid; |
233839b1 | 465 | struct cifs_pending_open open; |
1da177e4 | 466 | |
6d5786a3 | 467 | xid = get_xid(); |
1da177e4 LT |
468 | |
469 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
470 | tlink = cifs_sb_tlink(cifs_sb); |
471 | if (IS_ERR(tlink)) { | |
6d5786a3 | 472 | free_xid(xid); |
7ffec372 JL |
473 | return PTR_ERR(tlink); |
474 | } | |
475 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 476 | server = tcon->ses->server; |
1da177e4 | 477 | |
1f1735cb | 478 | full_path = build_path_from_dentry(file_dentry(file)); |
1da177e4 | 479 | if (full_path == NULL) { |
0f3bc09e | 480 | rc = -ENOMEM; |
232341ba | 481 | goto out; |
1da177e4 LT |
482 | } |
483 | ||
f96637be | 484 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 485 | inode, file->f_flags, full_path); |
276a74a4 | 486 | |
787aded6 NJ |
487 | if (file->f_flags & O_DIRECT && |
488 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { | |
489 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
490 | file->f_op = &cifs_file_direct_nobrl_ops; | |
491 | else | |
492 | file->f_op = &cifs_file_direct_ops; | |
493 | } | |
494 | ||
233839b1 | 495 | if (server->oplocks) |
276a74a4 SF |
496 | oplock = REQ_OPLOCK; |
497 | else | |
498 | oplock = 0; | |
499 | ||
64cc2c63 | 500 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
501 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
502 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 503 | /* can not refresh inode info since size could be stale */ |
2422f676 | 504 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 505 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 506 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 507 | if (rc == 0) { |
f96637be | 508 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 509 | posix_open_ok = true; |
64cc2c63 SF |
510 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
511 | if (tcon->ses->serverNOS) | |
f96637be JP |
512 | cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
513 | tcon->ses->serverName, | |
514 | tcon->ses->serverNOS); | |
64cc2c63 | 515 | tcon->broken_posix_open = true; |
276a74a4 SF |
516 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
517 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
518 | goto out; | |
fb1214e4 PS |
519 | /* |
520 | * Else fallthrough to retry open the old way on network i/o | |
521 | * or DFS errors. | |
522 | */ | |
276a74a4 SF |
523 | } |
524 | ||
233839b1 PS |
525 | if (server->ops->get_lease_key) |
526 | server->ops->get_lease_key(inode, &fid); | |
527 | ||
528 | cifs_add_pending_open(&fid, tlink, &open); | |
529 | ||
7e12eddb | 530 | if (!posix_open_ok) { |
b8c32dbb PS |
531 | if (server->ops->get_lease_key) |
532 | server->ops->get_lease_key(inode, &fid); | |
533 | ||
7e12eddb | 534 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 535 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
536 | if (rc) { |
537 | cifs_del_pending_open(&open); | |
7e12eddb | 538 | goto out; |
233839b1 | 539 | } |
7e12eddb | 540 | } |
47c78b7f | 541 | |
fb1214e4 PS |
542 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
543 | if (cfile == NULL) { | |
b8c32dbb PS |
544 | if (server->ops->close) |
545 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 546 | cifs_del_pending_open(&open); |
1da177e4 LT |
547 | rc = -ENOMEM; |
548 | goto out; | |
549 | } | |
1da177e4 | 550 | |
9451a9a5 SJ |
551 | cifs_fscache_set_inode_cookie(inode, file); |
552 | ||
7e12eddb | 553 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
554 | /* |
555 | * Time to set mode which we can not set earlier due to | |
556 | * problems creating new read-only files. | |
557 | */ | |
7e12eddb PS |
558 | struct cifs_unix_set_info_args args = { |
559 | .mode = inode->i_mode, | |
49418b2c EB |
560 | .uid = INVALID_UID, /* no change */ |
561 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
562 | .ctime = NO_CHANGE_64, |
563 | .atime = NO_CHANGE_64, | |
564 | .mtime = NO_CHANGE_64, | |
565 | .device = 0, | |
566 | }; | |
fb1214e4 PS |
567 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
568 | cfile->pid); | |
1da177e4 LT |
569 | } |
570 | ||
571 | out: | |
1da177e4 | 572 | kfree(full_path); |
6d5786a3 | 573 | free_xid(xid); |
7ffec372 | 574 | cifs_put_tlink(tlink); |
1da177e4 LT |
575 | return rc; |
576 | } | |
577 | ||
f152fd5f PS |
578 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
579 | ||
2ae78ba8 PS |
580 | /* |
581 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 582 | * to server was lost. |
2ae78ba8 | 583 | */ |
f152fd5f PS |
584 | static int |
585 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 586 | { |
f152fd5f | 587 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
2b0143b5 | 588 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
f152fd5f | 589 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1da177e4 LT |
590 | int rc = 0; |
591 | ||
560d3889 | 592 | down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING); |
f152fd5f | 593 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
594 | /* can cache locks - no need to relock */ |
595 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
596 | return rc; |
597 | } | |
598 | ||
599 | if (cap_unix(tcon->ses) && | |
600 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
601 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
602 | rc = cifs_push_posix_locks(cfile); | |
603 | else | |
604 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 605 | |
689c3db4 | 606 | up_read(&cinode->lock_sem); |
1da177e4 LT |
607 | return rc; |
608 | } | |
609 | ||
2ae78ba8 PS |
610 | static int |
611 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
612 | { |
613 | int rc = -EACCES; | |
6d5786a3 | 614 | unsigned int xid; |
590a3fe0 | 615 | __u32 oplock; |
1da177e4 | 616 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 617 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
618 | struct TCP_Server_Info *server; |
619 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 620 | struct inode *inode; |
1da177e4 | 621 | char *full_path = NULL; |
2ae78ba8 | 622 | int desired_access; |
1da177e4 | 623 | int disposition = FILE_OPEN; |
3d3ea8e6 | 624 | int create_options = CREATE_NOT_DIR; |
226730b4 | 625 | struct cifs_open_parms oparms; |
1da177e4 | 626 | |
6d5786a3 | 627 | xid = get_xid(); |
2ae78ba8 PS |
628 | mutex_lock(&cfile->fh_mutex); |
629 | if (!cfile->invalidHandle) { | |
630 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 631 | rc = 0; |
6d5786a3 | 632 | free_xid(xid); |
0f3bc09e | 633 | return rc; |
1da177e4 LT |
634 | } |
635 | ||
2b0143b5 | 636 | inode = d_inode(cfile->dentry); |
1da177e4 | 637 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
638 | tcon = tlink_tcon(cfile->tlink); |
639 | server = tcon->ses->server; | |
640 | ||
641 | /* | |
642 | * Can not grab rename sem here because various ops, including those | |
643 | * that already have the rename sem can end up causing writepage to get | |
644 | * called and if the server was down that means we end up here, and we | |
645 | * can never tell if the caller already has the rename_sem. | |
646 | */ | |
647 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 648 | if (full_path == NULL) { |
3a9f462f | 649 | rc = -ENOMEM; |
2ae78ba8 | 650 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 651 | free_xid(xid); |
3a9f462f | 652 | return rc; |
1da177e4 LT |
653 | } |
654 | ||
f96637be JP |
655 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
656 | inode, cfile->f_flags, full_path); | |
1da177e4 | 657 | |
10b9b98e | 658 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
659 | oplock = REQ_OPLOCK; |
660 | else | |
4b18f2a9 | 661 | oplock = 0; |
1da177e4 | 662 | |
29e20f9c | 663 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 664 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 665 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
666 | /* |
667 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
668 | * original open. Must mask them off for a reopen. | |
669 | */ | |
2ae78ba8 | 670 | unsigned int oflags = cfile->f_flags & |
15886177 | 671 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 672 | |
2422f676 | 673 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 | 674 | cifs_sb->mnt_file_mode /* ignored */, |
9cbc0b73 | 675 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 676 | if (rc == 0) { |
f96637be | 677 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 678 | oparms.reconnect = true; |
7fc8f4e9 SF |
679 | goto reopen_success; |
680 | } | |
2ae78ba8 PS |
681 | /* |
682 | * fallthrough to retry open the old way on errors, especially | |
683 | * in the reconnect path it is important to retry hard | |
684 | */ | |
7fc8f4e9 SF |
685 | } |
686 | ||
2ae78ba8 | 687 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 688 | |
3d3ea8e6 SP |
689 | if (backup_cred(cifs_sb)) |
690 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
691 | ||
b8c32dbb | 692 | if (server->ops->get_lease_key) |
9cbc0b73 | 693 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 694 | |
226730b4 PS |
695 | oparms.tcon = tcon; |
696 | oparms.cifs_sb = cifs_sb; | |
697 | oparms.desired_access = desired_access; | |
698 | oparms.create_options = create_options; | |
699 | oparms.disposition = disposition; | |
700 | oparms.path = full_path; | |
9cbc0b73 PS |
701 | oparms.fid = &cfile->fid; |
702 | oparms.reconnect = true; | |
226730b4 | 703 | |
2ae78ba8 PS |
704 | /* |
705 | * Can not refresh inode by passing in file_info buf to be returned by | |
d81b8a40 | 706 | * ops->open and then calling get_inode_info with returned buf since |
2ae78ba8 PS |
707 | * file might have write behind data that needs to be flushed and server |
708 | * version of file size can be stale. If we knew for sure that inode was | |
709 | * not dirty locally we could do this. | |
710 | */ | |
226730b4 | 711 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
712 | if (rc == -ENOENT && oparms.reconnect == false) { |
713 | /* durable handle timeout is expired - open the file again */ | |
714 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
715 | /* indicate that we need to relock the file */ | |
716 | oparms.reconnect = true; | |
717 | } | |
718 | ||
1da177e4 | 719 | if (rc) { |
2ae78ba8 | 720 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
721 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
722 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
723 | goto reopen_error_exit; |
724 | } | |
725 | ||
7fc8f4e9 | 726 | reopen_success: |
2ae78ba8 PS |
727 | cfile->invalidHandle = false; |
728 | mutex_unlock(&cfile->fh_mutex); | |
729 | cinode = CIFS_I(inode); | |
15886177 JL |
730 | |
731 | if (can_flush) { | |
732 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 733 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 734 | |
15886177 | 735 | if (tcon->unix_ext) |
2ae78ba8 PS |
736 | rc = cifs_get_inode_info_unix(&inode, full_path, |
737 | inode->i_sb, xid); | |
15886177 | 738 | else |
2ae78ba8 PS |
739 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
740 | inode->i_sb, xid, NULL); | |
741 | } | |
742 | /* | |
743 | * Else we are writing out data to server already and could deadlock if | |
744 | * we tried to flush data, and since we do not know if we have data that | |
745 | * would invalidate the current end of file on the server we can not go | |
746 | * to the server to get the new inode info. | |
747 | */ | |
748 | ||
de740250 PS |
749 | /* |
750 | * If the server returned a read oplock and we have mandatory brlocks, | |
751 | * set oplock level to None. | |
752 | */ | |
753 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { | |
754 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); | |
755 | oplock = 0; | |
756 | } | |
757 | ||
9cbc0b73 PS |
758 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
759 | if (oparms.reconnect) | |
760 | cifs_relock_file(cfile); | |
15886177 JL |
761 | |
762 | reopen_error_exit: | |
1da177e4 | 763 | kfree(full_path); |
6d5786a3 | 764 | free_xid(xid); |
1da177e4 LT |
765 | return rc; |
766 | } | |
767 | ||
768 | int cifs_close(struct inode *inode, struct file *file) | |
769 | { | |
77970693 JL |
770 | if (file->private_data != NULL) { |
771 | cifsFileInfo_put(file->private_data); | |
772 | file->private_data = NULL; | |
773 | } | |
7ee1af76 | 774 | |
cdff08e7 SF |
775 | /* return code from the ->release op is always ignored */ |
776 | return 0; | |
1da177e4 LT |
777 | } |
778 | ||
52ace1ef SF |
779 | void |
780 | cifs_reopen_persistent_handles(struct cifs_tcon *tcon) | |
781 | { | |
f2cca6a7 | 782 | struct cifsFileInfo *open_file; |
52ace1ef SF |
783 | struct list_head *tmp; |
784 | struct list_head *tmp1; | |
f2cca6a7 PS |
785 | struct list_head tmp_list; |
786 | ||
96a988ff PS |
787 | if (!tcon->use_persistent || !tcon->need_reopen_files) |
788 | return; | |
789 | ||
790 | tcon->need_reopen_files = false; | |
791 | ||
f2cca6a7 PS |
792 | cifs_dbg(FYI, "Reopen persistent handles"); |
793 | INIT_LIST_HEAD(&tmp_list); | |
52ace1ef SF |
794 | |
795 | /* list all files open on tree connection, reopen resilient handles */ | |
796 | spin_lock(&tcon->open_file_lock); | |
f2cca6a7 | 797 | list_for_each(tmp, &tcon->openFileList) { |
52ace1ef | 798 | open_file = list_entry(tmp, struct cifsFileInfo, tlist); |
f2cca6a7 PS |
799 | if (!open_file->invalidHandle) |
800 | continue; | |
801 | cifsFileInfo_get(open_file); | |
802 | list_add_tail(&open_file->rlist, &tmp_list); | |
52ace1ef SF |
803 | } |
804 | spin_unlock(&tcon->open_file_lock); | |
f2cca6a7 PS |
805 | |
806 | list_for_each_safe(tmp, tmp1, &tmp_list) { | |
807 | open_file = list_entry(tmp, struct cifsFileInfo, rlist); | |
96a988ff PS |
808 | if (cifs_reopen_file(open_file, false /* do not flush */)) |
809 | tcon->need_reopen_files = true; | |
f2cca6a7 PS |
810 | list_del_init(&open_file->rlist); |
811 | cifsFileInfo_put(open_file); | |
812 | } | |
52ace1ef SF |
813 | } |
814 | ||
1da177e4 LT |
815 | int cifs_closedir(struct inode *inode, struct file *file) |
816 | { | |
817 | int rc = 0; | |
6d5786a3 | 818 | unsigned int xid; |
4b4de76e | 819 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
820 | struct cifs_tcon *tcon; |
821 | struct TCP_Server_Info *server; | |
822 | char *buf; | |
1da177e4 | 823 | |
f96637be | 824 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 825 | |
92fc65a7 PS |
826 | if (cfile == NULL) |
827 | return rc; | |
828 | ||
6d5786a3 | 829 | xid = get_xid(); |
92fc65a7 PS |
830 | tcon = tlink_tcon(cfile->tlink); |
831 | server = tcon->ses->server; | |
1da177e4 | 832 | |
f96637be | 833 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
3afca265 | 834 | spin_lock(&cfile->file_info_lock); |
52755808 | 835 | if (server->ops->dir_needs_close(cfile)) { |
92fc65a7 | 836 | cfile->invalidHandle = true; |
3afca265 | 837 | spin_unlock(&cfile->file_info_lock); |
92fc65a7 PS |
838 | if (server->ops->close_dir) |
839 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
840 | else | |
841 | rc = -ENOSYS; | |
f96637be | 842 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
843 | /* not much we can do if it fails anyway, ignore rc */ |
844 | rc = 0; | |
845 | } else | |
3afca265 | 846 | spin_unlock(&cfile->file_info_lock); |
92fc65a7 PS |
847 | |
848 | buf = cfile->srch_inf.ntwrk_buf_start; | |
849 | if (buf) { | |
f96637be | 850 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
851 | cfile->srch_inf.ntwrk_buf_start = NULL; |
852 | if (cfile->srch_inf.smallBuf) | |
853 | cifs_small_buf_release(buf); | |
854 | else | |
855 | cifs_buf_release(buf); | |
1da177e4 | 856 | } |
92fc65a7 PS |
857 | |
858 | cifs_put_tlink(cfile->tlink); | |
859 | kfree(file->private_data); | |
860 | file->private_data = NULL; | |
1da177e4 | 861 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 862 | free_xid(xid); |
1da177e4 LT |
863 | return rc; |
864 | } | |
865 | ||
85160e03 | 866 | static struct cifsLockInfo * |
fbd35aca | 867 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 868 | { |
a88b4707 | 869 | struct cifsLockInfo *lock = |
fb8c4b14 | 870 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
871 | if (!lock) |
872 | return lock; | |
873 | lock->offset = offset; | |
874 | lock->length = length; | |
875 | lock->type = type; | |
a88b4707 PS |
876 | lock->pid = current->tgid; |
877 | INIT_LIST_HEAD(&lock->blist); | |
878 | init_waitqueue_head(&lock->block_q); | |
879 | return lock; | |
85160e03 PS |
880 | } |
881 | ||
f7ba7fe6 | 882 | void |
85160e03 PS |
883 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
884 | { | |
885 | struct cifsLockInfo *li, *tmp; | |
886 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
887 | list_del_init(&li->blist); | |
888 | wake_up(&li->block_q); | |
889 | } | |
890 | } | |
891 | ||
081c0414 PS |
892 | #define CIFS_LOCK_OP 0 |
893 | #define CIFS_READ_OP 1 | |
894 | #define CIFS_WRITE_OP 2 | |
895 | ||
896 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 897 | static bool |
f45d3416 PS |
898 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
899 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
081c0414 | 900 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 901 | { |
fbd35aca | 902 | struct cifsLockInfo *li; |
f45d3416 | 903 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 904 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 905 | |
f45d3416 | 906 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
907 | if (offset + length <= li->offset || |
908 | offset >= li->offset + li->length) | |
909 | continue; | |
081c0414 PS |
910 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
911 | server->ops->compare_fids(cfile, cur_cfile)) { | |
912 | /* shared lock prevents write op through the same fid */ | |
913 | if (!(li->type & server->vals->shared_lock_type) || | |
914 | rw_check != CIFS_WRITE_OP) | |
915 | continue; | |
916 | } | |
f45d3416 PS |
917 | if ((type & server->vals->shared_lock_type) && |
918 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
919 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 920 | continue; |
579f9053 PS |
921 | if (conf_lock) |
922 | *conf_lock = li; | |
f45d3416 | 923 | return true; |
85160e03 PS |
924 | } |
925 | return false; | |
926 | } | |
927 | ||
579f9053 | 928 | bool |
55157dfb | 929 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 | 930 | __u8 type, struct cifsLockInfo **conf_lock, |
081c0414 | 931 | int rw_check) |
161ebf9f | 932 | { |
fbd35aca | 933 | bool rc = false; |
f45d3416 | 934 | struct cifs_fid_locks *cur; |
2b0143b5 | 935 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
fbd35aca | 936 | |
f45d3416 PS |
937 | list_for_each_entry(cur, &cinode->llist, llist) { |
938 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 939 | cfile, conf_lock, rw_check); |
fbd35aca PS |
940 | if (rc) |
941 | break; | |
942 | } | |
fbd35aca PS |
943 | |
944 | return rc; | |
161ebf9f PS |
945 | } |
946 | ||
9a5101c8 PS |
947 | /* |
948 | * Check if there is another lock that prevents us to set the lock (mandatory | |
949 | * style). If such a lock exists, update the flock structure with its | |
950 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
951 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
952 | * the server or 1 otherwise. | |
953 | */ | |
85160e03 | 954 | static int |
fbd35aca PS |
955 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
956 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
957 | { |
958 | int rc = 0; | |
959 | struct cifsLockInfo *conf_lock; | |
2b0143b5 | 960 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
106dc538 | 961 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
962 | bool exist; |
963 | ||
1b4b55a1 | 964 | down_read(&cinode->lock_sem); |
85160e03 | 965 | |
55157dfb | 966 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
081c0414 | 967 | &conf_lock, CIFS_LOCK_OP); |
85160e03 PS |
968 | if (exist) { |
969 | flock->fl_start = conf_lock->offset; | |
970 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
971 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 972 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
973 | flock->fl_type = F_RDLCK; |
974 | else | |
975 | flock->fl_type = F_WRLCK; | |
976 | } else if (!cinode->can_cache_brlcks) | |
977 | rc = 1; | |
978 | else | |
979 | flock->fl_type = F_UNLCK; | |
980 | ||
1b4b55a1 | 981 | up_read(&cinode->lock_sem); |
85160e03 PS |
982 | return rc; |
983 | } | |
984 | ||
161ebf9f | 985 | static void |
fbd35aca | 986 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 987 | { |
2b0143b5 | 988 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
1b4b55a1 | 989 | down_write(&cinode->lock_sem); |
f45d3416 | 990 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 991 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
992 | } |
993 | ||
9a5101c8 PS |
994 | /* |
995 | * Set the byte-range lock (mandatory style). Returns: | |
996 | * 1) 0, if we set the lock and don't need to request to the server; | |
997 | * 2) 1, if no locks prevent us but we need to request to the server; | |
998 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
999 | */ | |
85160e03 | 1000 | static int |
fbd35aca | 1001 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 1002 | bool wait) |
85160e03 | 1003 | { |
161ebf9f | 1004 | struct cifsLockInfo *conf_lock; |
2b0143b5 | 1005 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
85160e03 PS |
1006 | bool exist; |
1007 | int rc = 0; | |
1008 | ||
85160e03 PS |
1009 | try_again: |
1010 | exist = false; | |
1b4b55a1 | 1011 | down_write(&cinode->lock_sem); |
85160e03 | 1012 | |
55157dfb | 1013 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
081c0414 | 1014 | lock->type, &conf_lock, CIFS_LOCK_OP); |
85160e03 | 1015 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 1016 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 1017 | up_write(&cinode->lock_sem); |
85160e03 PS |
1018 | return rc; |
1019 | } | |
1020 | ||
1021 | if (!exist) | |
1022 | rc = 1; | |
1023 | else if (!wait) | |
1024 | rc = -EACCES; | |
1025 | else { | |
1026 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 1027 | up_write(&cinode->lock_sem); |
85160e03 PS |
1028 | rc = wait_event_interruptible(lock->block_q, |
1029 | (lock->blist.prev == &lock->blist) && | |
1030 | (lock->blist.next == &lock->blist)); | |
1031 | if (!rc) | |
1032 | goto try_again; | |
1b4b55a1 | 1033 | down_write(&cinode->lock_sem); |
a88b4707 | 1034 | list_del_init(&lock->blist); |
85160e03 PS |
1035 | } |
1036 | ||
1b4b55a1 | 1037 | up_write(&cinode->lock_sem); |
85160e03 PS |
1038 | return rc; |
1039 | } | |
1040 | ||
9a5101c8 PS |
1041 | /* |
1042 | * Check if there is another lock that prevents us to set the lock (posix | |
1043 | * style). If such a lock exists, update the flock structure with its | |
1044 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
1045 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
1046 | * the server or 1 otherwise. | |
1047 | */ | |
85160e03 | 1048 | static int |
4f6bcec9 PS |
1049 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
1050 | { | |
1051 | int rc = 0; | |
496ad9aa | 1052 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
1053 | unsigned char saved_type = flock->fl_type; |
1054 | ||
50792760 PS |
1055 | if ((flock->fl_flags & FL_POSIX) == 0) |
1056 | return 1; | |
1057 | ||
1b4b55a1 | 1058 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
1059 | posix_test_lock(file, flock); |
1060 | ||
1061 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
1062 | flock->fl_type = saved_type; | |
1063 | rc = 1; | |
1064 | } | |
1065 | ||
1b4b55a1 | 1066 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
1067 | return rc; |
1068 | } | |
1069 | ||
9a5101c8 PS |
1070 | /* |
1071 | * Set the byte-range lock (posix style). Returns: | |
1072 | * 1) 0, if we set the lock and don't need to request to the server; | |
1073 | * 2) 1, if we need to request to the server; | |
1074 | * 3) <0, if the error occurs while setting the lock. | |
1075 | */ | |
4f6bcec9 PS |
1076 | static int |
1077 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1078 | { | |
496ad9aa | 1079 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
50792760 PS |
1080 | int rc = 1; |
1081 | ||
1082 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1083 | return rc; | |
4f6bcec9 | 1084 | |
66189be7 | 1085 | try_again: |
1b4b55a1 | 1086 | down_write(&cinode->lock_sem); |
4f6bcec9 | 1087 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1088 | up_write(&cinode->lock_sem); |
50792760 | 1089 | return rc; |
4f6bcec9 | 1090 | } |
66189be7 PS |
1091 | |
1092 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1093 | up_write(&cinode->lock_sem); |
66189be7 PS |
1094 | if (rc == FILE_LOCK_DEFERRED) { |
1095 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
1096 | if (!rc) | |
1097 | goto try_again; | |
1a9e64a7 | 1098 | posix_unblock_lock(flock); |
66189be7 | 1099 | } |
9ebb389d | 1100 | return rc; |
4f6bcec9 PS |
1101 | } |
1102 | ||
d39a4f71 | 1103 | int |
4f6bcec9 | 1104 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1105 | { |
6d5786a3 PS |
1106 | unsigned int xid; |
1107 | int rc = 0, stored_rc; | |
85160e03 PS |
1108 | struct cifsLockInfo *li, *tmp; |
1109 | struct cifs_tcon *tcon; | |
0013fb4c | 1110 | unsigned int num, max_num, max_buf; |
32b9aaf1 | 1111 | LOCKING_ANDX_RANGE *buf, *cur; |
4d61eda8 CIK |
1112 | static const int types[] = { |
1113 | LOCKING_ANDX_LARGE_FILES, | |
1114 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES | |
1115 | }; | |
32b9aaf1 | 1116 | int i; |
85160e03 | 1117 | |
6d5786a3 | 1118 | xid = get_xid(); |
85160e03 PS |
1119 | tcon = tlink_tcon(cfile->tlink); |
1120 | ||
0013fb4c PS |
1121 | /* |
1122 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1123 | * and check it for zero before using. | |
1124 | */ | |
1125 | max_buf = tcon->ses->server->maxBuf; | |
1126 | if (!max_buf) { | |
6d5786a3 | 1127 | free_xid(xid); |
0013fb4c PS |
1128 | return -EINVAL; |
1129 | } | |
1130 | ||
1131 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1132 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1133 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
32b9aaf1 | 1134 | if (!buf) { |
6d5786a3 | 1135 | free_xid(xid); |
e2f2886a | 1136 | return -ENOMEM; |
32b9aaf1 PS |
1137 | } |
1138 | ||
1139 | for (i = 0; i < 2; i++) { | |
1140 | cur = buf; | |
1141 | num = 0; | |
f45d3416 | 1142 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1143 | if (li->type != types[i]) |
1144 | continue; | |
1145 | cur->Pid = cpu_to_le16(li->pid); | |
1146 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1147 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1148 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1149 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1150 | if (++num == max_num) { | |
4b4de76e PS |
1151 | stored_rc = cifs_lockv(xid, tcon, |
1152 | cfile->fid.netfid, | |
04a6aa8a PS |
1153 | (__u8)li->type, 0, num, |
1154 | buf); | |
32b9aaf1 PS |
1155 | if (stored_rc) |
1156 | rc = stored_rc; | |
1157 | cur = buf; | |
1158 | num = 0; | |
1159 | } else | |
1160 | cur++; | |
1161 | } | |
1162 | ||
1163 | if (num) { | |
4b4de76e | 1164 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1165 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1166 | if (stored_rc) |
1167 | rc = stored_rc; | |
1168 | } | |
85160e03 PS |
1169 | } |
1170 | ||
32b9aaf1 | 1171 | kfree(buf); |
6d5786a3 | 1172 | free_xid(xid); |
85160e03 PS |
1173 | return rc; |
1174 | } | |
1175 | ||
3d22462a JL |
1176 | static __u32 |
1177 | hash_lockowner(fl_owner_t owner) | |
1178 | { | |
1179 | return cifs_lock_secret ^ hash32_ptr((const void *)owner); | |
1180 | } | |
1181 | ||
d5751469 PS |
1182 | struct lock_to_push { |
1183 | struct list_head llist; | |
1184 | __u64 offset; | |
1185 | __u64 length; | |
1186 | __u32 pid; | |
1187 | __u16 netfid; | |
1188 | __u8 type; | |
1189 | }; | |
1190 | ||
4f6bcec9 | 1191 | static int |
b8db928b | 1192 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1193 | { |
2b0143b5 | 1194 | struct inode *inode = d_inode(cfile->dentry); |
4f6bcec9 | 1195 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
bd61e0a9 JL |
1196 | struct file_lock *flock; |
1197 | struct file_lock_context *flctx = inode->i_flctx; | |
e084c1bd | 1198 | unsigned int count = 0, i; |
4f6bcec9 | 1199 | int rc = 0, xid, type; |
d5751469 PS |
1200 | struct list_head locks_to_send, *el; |
1201 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1202 | __u64 length; |
4f6bcec9 | 1203 | |
6d5786a3 | 1204 | xid = get_xid(); |
4f6bcec9 | 1205 | |
bd61e0a9 JL |
1206 | if (!flctx) |
1207 | goto out; | |
d5751469 | 1208 | |
e084c1bd JL |
1209 | spin_lock(&flctx->flc_lock); |
1210 | list_for_each(el, &flctx->flc_posix) { | |
1211 | count++; | |
1212 | } | |
1213 | spin_unlock(&flctx->flc_lock); | |
1214 | ||
4f6bcec9 PS |
1215 | INIT_LIST_HEAD(&locks_to_send); |
1216 | ||
d5751469 | 1217 | /* |
e084c1bd JL |
1218 | * Allocating count locks is enough because no FL_POSIX locks can be |
1219 | * added to the list while we are holding cinode->lock_sem that | |
ce85852b | 1220 | * protects locking operations of this inode. |
d5751469 | 1221 | */ |
e084c1bd | 1222 | for (i = 0; i < count; i++) { |
d5751469 PS |
1223 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
1224 | if (!lck) { | |
1225 | rc = -ENOMEM; | |
1226 | goto err_out; | |
1227 | } | |
1228 | list_add_tail(&lck->llist, &locks_to_send); | |
1229 | } | |
1230 | ||
d5751469 | 1231 | el = locks_to_send.next; |
6109c850 | 1232 | spin_lock(&flctx->flc_lock); |
bd61e0a9 | 1233 | list_for_each_entry(flock, &flctx->flc_posix, fl_list) { |
d5751469 | 1234 | if (el == &locks_to_send) { |
ce85852b PS |
1235 | /* |
1236 | * The list ended. We don't have enough allocated | |
1237 | * structures - something is really wrong. | |
1238 | */ | |
f96637be | 1239 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1240 | break; |
1241 | } | |
4f6bcec9 PS |
1242 | length = 1 + flock->fl_end - flock->fl_start; |
1243 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1244 | type = CIFS_RDLCK; | |
1245 | else | |
1246 | type = CIFS_WRLCK; | |
d5751469 | 1247 | lck = list_entry(el, struct lock_to_push, llist); |
3d22462a | 1248 | lck->pid = hash_lockowner(flock->fl_owner); |
4b4de76e | 1249 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1250 | lck->length = length; |
1251 | lck->type = type; | |
1252 | lck->offset = flock->fl_start; | |
4f6bcec9 | 1253 | } |
6109c850 | 1254 | spin_unlock(&flctx->flc_lock); |
4f6bcec9 PS |
1255 | |
1256 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1257 | int stored_rc; |
1258 | ||
4f6bcec9 | 1259 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1260 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1261 | lck->type, 0); |
1262 | if (stored_rc) | |
1263 | rc = stored_rc; | |
1264 | list_del(&lck->llist); | |
1265 | kfree(lck); | |
1266 | } | |
1267 | ||
d5751469 | 1268 | out: |
6d5786a3 | 1269 | free_xid(xid); |
4f6bcec9 | 1270 | return rc; |
d5751469 PS |
1271 | err_out: |
1272 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1273 | list_del(&lck->llist); | |
1274 | kfree(lck); | |
1275 | } | |
1276 | goto out; | |
4f6bcec9 PS |
1277 | } |
1278 | ||
9ec3c882 | 1279 | static int |
b8db928b | 1280 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1281 | { |
b8db928b | 1282 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
2b0143b5 | 1283 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
b8db928b | 1284 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1285 | int rc = 0; |
1286 | ||
1287 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1288 | down_write(&cinode->lock_sem); | |
1289 | if (!cinode->can_cache_brlcks) { | |
1290 | up_write(&cinode->lock_sem); | |
1291 | return rc; | |
1292 | } | |
4f6bcec9 | 1293 | |
29e20f9c | 1294 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1295 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1296 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1297 | rc = cifs_push_posix_locks(cfile); |
1298 | else | |
1299 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1300 | |
b8db928b PS |
1301 | cinode->can_cache_brlcks = false; |
1302 | up_write(&cinode->lock_sem); | |
1303 | return rc; | |
4f6bcec9 PS |
1304 | } |
1305 | ||
03776f45 | 1306 | static void |
04a6aa8a | 1307 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1308 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1309 | { |
03776f45 | 1310 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1311 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1312 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1313 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1314 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1315 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1316 | *wait_flag = true; |
1da177e4 | 1317 | } |
03776f45 | 1318 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1319 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1320 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1321 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1322 | if (flock->fl_flags & |
3d6d854a JL |
1323 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1324 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
f96637be | 1325 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1326 | |
106dc538 | 1327 | *type = server->vals->large_lock_type; |
03776f45 | 1328 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1329 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1330 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1331 | *lock = 1; |
1332 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1333 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1334 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1335 | *unlock = 1; |
1336 | /* Check if unlock includes more than one lock range */ | |
1337 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1338 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1339 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1340 | *lock = 1; |
1341 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1342 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1343 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1344 | *lock = 1; |
1345 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1346 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1347 | *type |= server->vals->shared_lock_type; |
03776f45 | 1348 | *lock = 1; |
1da177e4 | 1349 | } else |
f96637be | 1350 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1351 | } |
1da177e4 | 1352 | |
03776f45 | 1353 | static int |
04a6aa8a | 1354 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1355 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1356 | { |
1357 | int rc = 0; | |
1358 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1359 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1360 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1361 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1362 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1363 | |
03776f45 PS |
1364 | if (posix_lck) { |
1365 | int posix_lock_type; | |
4f6bcec9 PS |
1366 | |
1367 | rc = cifs_posix_lock_test(file, flock); | |
1368 | if (!rc) | |
1369 | return rc; | |
1370 | ||
106dc538 | 1371 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1372 | posix_lock_type = CIFS_RDLCK; |
1373 | else | |
1374 | posix_lock_type = CIFS_WRLCK; | |
3d22462a JL |
1375 | rc = CIFSSMBPosixLock(xid, tcon, netfid, |
1376 | hash_lockowner(flock->fl_owner), | |
c5fd363d | 1377 | flock->fl_start, length, flock, |
4f6bcec9 | 1378 | posix_lock_type, wait_flag); |
03776f45 PS |
1379 | return rc; |
1380 | } | |
1da177e4 | 1381 | |
fbd35aca | 1382 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1383 | if (!rc) |
1384 | return rc; | |
1385 | ||
03776f45 | 1386 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1387 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1388 | 1, 0, false); | |
03776f45 | 1389 | if (rc == 0) { |
d39a4f71 PS |
1390 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1391 | type, 0, 1, false); | |
03776f45 PS |
1392 | flock->fl_type = F_UNLCK; |
1393 | if (rc != 0) | |
f96637be JP |
1394 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1395 | rc); | |
a88b4707 | 1396 | return 0; |
1da177e4 | 1397 | } |
7ee1af76 | 1398 | |
106dc538 | 1399 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1400 | flock->fl_type = F_WRLCK; |
a88b4707 | 1401 | return 0; |
7ee1af76 JA |
1402 | } |
1403 | ||
d39a4f71 PS |
1404 | type &= ~server->vals->exclusive_lock_type; |
1405 | ||
1406 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1407 | type | server->vals->shared_lock_type, | |
1408 | 1, 0, false); | |
03776f45 | 1409 | if (rc == 0) { |
d39a4f71 PS |
1410 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1411 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1412 | flock->fl_type = F_RDLCK; |
1413 | if (rc != 0) | |
f96637be JP |
1414 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1415 | rc); | |
03776f45 PS |
1416 | } else |
1417 | flock->fl_type = F_WRLCK; | |
1418 | ||
a88b4707 | 1419 | return 0; |
03776f45 PS |
1420 | } |
1421 | ||
f7ba7fe6 | 1422 | void |
9ee305b7 PS |
1423 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1424 | { | |
1425 | struct list_head *li, *tmp; | |
1426 | list_for_each_safe(li, tmp, source) | |
1427 | list_move(li, dest); | |
1428 | } | |
1429 | ||
f7ba7fe6 | 1430 | void |
9ee305b7 PS |
1431 | cifs_free_llist(struct list_head *llist) |
1432 | { | |
1433 | struct cifsLockInfo *li, *tmp; | |
1434 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1435 | cifs_del_lock_waiters(li); | |
1436 | list_del(&li->llist); | |
1437 | kfree(li); | |
1438 | } | |
1439 | } | |
1440 | ||
d39a4f71 | 1441 | int |
6d5786a3 PS |
1442 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1443 | unsigned int xid) | |
9ee305b7 PS |
1444 | { |
1445 | int rc = 0, stored_rc; | |
4d61eda8 CIK |
1446 | static const int types[] = { |
1447 | LOCKING_ANDX_LARGE_FILES, | |
1448 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES | |
1449 | }; | |
9ee305b7 | 1450 | unsigned int i; |
0013fb4c | 1451 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1452 | LOCKING_ANDX_RANGE *buf, *cur; |
1453 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2b0143b5 | 1454 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
9ee305b7 PS |
1455 | struct cifsLockInfo *li, *tmp; |
1456 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1457 | struct list_head tmp_llist; | |
1458 | ||
1459 | INIT_LIST_HEAD(&tmp_llist); | |
1460 | ||
0013fb4c PS |
1461 | /* |
1462 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1463 | * and check it for zero before using. | |
1464 | */ | |
1465 | max_buf = tcon->ses->server->maxBuf; | |
1466 | if (!max_buf) | |
1467 | return -EINVAL; | |
1468 | ||
1469 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1470 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1471 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
9ee305b7 PS |
1472 | if (!buf) |
1473 | return -ENOMEM; | |
1474 | ||
1b4b55a1 | 1475 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1476 | for (i = 0; i < 2; i++) { |
1477 | cur = buf; | |
1478 | num = 0; | |
f45d3416 | 1479 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1480 | if (flock->fl_start > li->offset || |
1481 | (flock->fl_start + length) < | |
1482 | (li->offset + li->length)) | |
1483 | continue; | |
1484 | if (current->tgid != li->pid) | |
1485 | continue; | |
9ee305b7 PS |
1486 | if (types[i] != li->type) |
1487 | continue; | |
ea319d57 | 1488 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1489 | /* |
1490 | * We can cache brlock requests - simply remove | |
fbd35aca | 1491 | * a lock from the file's list. |
9ee305b7 PS |
1492 | */ |
1493 | list_del(&li->llist); | |
1494 | cifs_del_lock_waiters(li); | |
1495 | kfree(li); | |
ea319d57 | 1496 | continue; |
9ee305b7 | 1497 | } |
ea319d57 PS |
1498 | cur->Pid = cpu_to_le16(li->pid); |
1499 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1500 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1501 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1502 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1503 | /* | |
1504 | * We need to save a lock here to let us add it again to | |
1505 | * the file's list if the unlock range request fails on | |
1506 | * the server. | |
1507 | */ | |
1508 | list_move(&li->llist, &tmp_llist); | |
1509 | if (++num == max_num) { | |
4b4de76e PS |
1510 | stored_rc = cifs_lockv(xid, tcon, |
1511 | cfile->fid.netfid, | |
ea319d57 PS |
1512 | li->type, num, 0, buf); |
1513 | if (stored_rc) { | |
1514 | /* | |
1515 | * We failed on the unlock range | |
1516 | * request - add all locks from the tmp | |
1517 | * list to the head of the file's list. | |
1518 | */ | |
1519 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1520 | &cfile->llist->locks); |
ea319d57 PS |
1521 | rc = stored_rc; |
1522 | } else | |
1523 | /* | |
1524 | * The unlock range request succeed - | |
1525 | * free the tmp list. | |
1526 | */ | |
1527 | cifs_free_llist(&tmp_llist); | |
1528 | cur = buf; | |
1529 | num = 0; | |
1530 | } else | |
1531 | cur++; | |
9ee305b7 PS |
1532 | } |
1533 | if (num) { | |
4b4de76e | 1534 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1535 | types[i], num, 0, buf); |
1536 | if (stored_rc) { | |
f45d3416 PS |
1537 | cifs_move_llist(&tmp_llist, |
1538 | &cfile->llist->locks); | |
9ee305b7 PS |
1539 | rc = stored_rc; |
1540 | } else | |
1541 | cifs_free_llist(&tmp_llist); | |
1542 | } | |
1543 | } | |
1544 | ||
1b4b55a1 | 1545 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1546 | kfree(buf); |
1547 | return rc; | |
1548 | } | |
1549 | ||
03776f45 | 1550 | static int |
f45d3416 | 1551 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1552 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1553 | unsigned int xid) | |
03776f45 PS |
1554 | { |
1555 | int rc = 0; | |
1556 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1557 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1558 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1559 | struct TCP_Server_Info *server = tcon->ses->server; |
2b0143b5 | 1560 | struct inode *inode = d_inode(cfile->dentry); |
03776f45 PS |
1561 | |
1562 | if (posix_lck) { | |
08547b03 | 1563 | int posix_lock_type; |
4f6bcec9 PS |
1564 | |
1565 | rc = cifs_posix_lock_set(file, flock); | |
1566 | if (!rc || rc < 0) | |
1567 | return rc; | |
1568 | ||
106dc538 | 1569 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1570 | posix_lock_type = CIFS_RDLCK; |
1571 | else | |
1572 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1573 | |
03776f45 | 1574 | if (unlock == 1) |
beb84dc8 | 1575 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1576 | |
f45d3416 | 1577 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
3d22462a JL |
1578 | hash_lockowner(flock->fl_owner), |
1579 | flock->fl_start, length, | |
f45d3416 | 1580 | NULL, posix_lock_type, wait_flag); |
03776f45 PS |
1581 | goto out; |
1582 | } | |
7ee1af76 | 1583 | |
03776f45 | 1584 | if (lock) { |
161ebf9f PS |
1585 | struct cifsLockInfo *lock; |
1586 | ||
fbd35aca | 1587 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1588 | if (!lock) |
1589 | return -ENOMEM; | |
1590 | ||
fbd35aca | 1591 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1592 | if (rc < 0) { |
161ebf9f | 1593 | kfree(lock); |
21cb2d90 PS |
1594 | return rc; |
1595 | } | |
1596 | if (!rc) | |
85160e03 PS |
1597 | goto out; |
1598 | ||
63b7d3a4 PS |
1599 | /* |
1600 | * Windows 7 server can delay breaking lease from read to None | |
1601 | * if we set a byte-range lock on a file - break it explicitly | |
1602 | * before sending the lock to the server to be sure the next | |
1603 | * read won't conflict with non-overlapted locks due to | |
1604 | * pagereading. | |
1605 | */ | |
18cceb6a PS |
1606 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
1607 | CIFS_CACHE_READ(CIFS_I(inode))) { | |
4f73c7d3 | 1608 | cifs_zap_mapping(inode); |
f96637be JP |
1609 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1610 | inode); | |
18cceb6a | 1611 | CIFS_I(inode)->oplock = 0; |
63b7d3a4 PS |
1612 | } |
1613 | ||
d39a4f71 PS |
1614 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1615 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1616 | if (rc) { |
1617 | kfree(lock); | |
21cb2d90 | 1618 | return rc; |
03776f45 | 1619 | } |
161ebf9f | 1620 | |
fbd35aca | 1621 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1622 | } else if (unlock) |
d39a4f71 | 1623 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1624 | |
03776f45 | 1625 | out: |
00b8c95b | 1626 | if (flock->fl_flags & FL_POSIX && !rc) |
4f656367 | 1627 | rc = locks_lock_file_wait(file, flock); |
03776f45 PS |
1628 | return rc; |
1629 | } | |
1630 | ||
1631 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1632 | { | |
1633 | int rc, xid; | |
1634 | int lock = 0, unlock = 0; | |
1635 | bool wait_flag = false; | |
1636 | bool posix_lck = false; | |
1637 | struct cifs_sb_info *cifs_sb; | |
1638 | struct cifs_tcon *tcon; | |
1639 | struct cifsInodeInfo *cinode; | |
1640 | struct cifsFileInfo *cfile; | |
1641 | __u16 netfid; | |
04a6aa8a | 1642 | __u32 type; |
03776f45 PS |
1643 | |
1644 | rc = -EACCES; | |
6d5786a3 | 1645 | xid = get_xid(); |
03776f45 | 1646 | |
f96637be JP |
1647 | cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n", |
1648 | cmd, flock->fl_flags, flock->fl_type, | |
1649 | flock->fl_start, flock->fl_end); | |
03776f45 | 1650 | |
03776f45 PS |
1651 | cfile = (struct cifsFileInfo *)file->private_data; |
1652 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1653 | |
1654 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1655 | tcon->ses->server); | |
1656 | ||
7119e220 | 1657 | cifs_sb = CIFS_FILE_SB(file); |
4b4de76e | 1658 | netfid = cfile->fid.netfid; |
496ad9aa | 1659 | cinode = CIFS_I(file_inode(file)); |
03776f45 | 1660 | |
29e20f9c | 1661 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1662 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1663 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1664 | posix_lck = true; | |
1665 | /* | |
1666 | * BB add code here to normalize offset and length to account for | |
1667 | * negative length which we can not accept over the wire. | |
1668 | */ | |
1669 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1670 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1671 | free_xid(xid); |
03776f45 PS |
1672 | return rc; |
1673 | } | |
1674 | ||
1675 | if (!lock && !unlock) { | |
1676 | /* | |
1677 | * if no lock or unlock then nothing to do since we do not | |
1678 | * know what it is | |
1679 | */ | |
6d5786a3 | 1680 | free_xid(xid); |
03776f45 | 1681 | return -EOPNOTSUPP; |
7ee1af76 JA |
1682 | } |
1683 | ||
03776f45 PS |
1684 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1685 | xid); | |
6d5786a3 | 1686 | free_xid(xid); |
1da177e4 LT |
1687 | return rc; |
1688 | } | |
1689 | ||
597b027f JL |
1690 | /* |
1691 | * update the file size (if needed) after a write. Should be called with | |
1692 | * the inode->i_lock held | |
1693 | */ | |
72432ffc | 1694 | void |
fbec9ab9 JL |
1695 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1696 | unsigned int bytes_written) | |
1697 | { | |
1698 | loff_t end_of_write = offset + bytes_written; | |
1699 | ||
1700 | if (end_of_write > cifsi->server_eof) | |
1701 | cifsi->server_eof = end_of_write; | |
1702 | } | |
1703 | ||
ba9ad725 PS |
1704 | static ssize_t |
1705 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1706 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1707 | { |
1708 | int rc = 0; | |
1709 | unsigned int bytes_written = 0; | |
1710 | unsigned int total_written; | |
1711 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1712 | struct cifs_tcon *tcon; |
1713 | struct TCP_Server_Info *server; | |
6d5786a3 | 1714 | unsigned int xid; |
7da4b49a | 1715 | struct dentry *dentry = open_file->dentry; |
2b0143b5 | 1716 | struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry)); |
fa2989f4 | 1717 | struct cifs_io_parms io_parms; |
1da177e4 | 1718 | |
7da4b49a | 1719 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1720 | |
35c265e0 AV |
1721 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n", |
1722 | write_size, *offset, dentry); | |
1da177e4 | 1723 | |
ba9ad725 PS |
1724 | tcon = tlink_tcon(open_file->tlink); |
1725 | server = tcon->ses->server; | |
1726 | ||
1727 | if (!server->ops->sync_write) | |
1728 | return -ENOSYS; | |
50c2f753 | 1729 | |
6d5786a3 | 1730 | xid = get_xid(); |
1da177e4 | 1731 | |
1da177e4 LT |
1732 | for (total_written = 0; write_size > total_written; |
1733 | total_written += bytes_written) { | |
1734 | rc = -EAGAIN; | |
1735 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1736 | struct kvec iov[2]; |
1737 | unsigned int len; | |
1738 | ||
1da177e4 | 1739 | if (open_file->invalidHandle) { |
1da177e4 LT |
1740 | /* we could deadlock if we called |
1741 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1742 | reopen_file not to flush data to |
1da177e4 | 1743 | server now */ |
15886177 | 1744 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1745 | if (rc != 0) |
1746 | break; | |
1747 | } | |
ca83ce3d | 1748 | |
2b0143b5 | 1749 | len = min(server->ops->wp_retry_size(d_inode(dentry)), |
cb7e9eab | 1750 | (unsigned int)write_size - total_written); |
ca83ce3d JL |
1751 | /* iov[0] is reserved for smb header */ |
1752 | iov[1].iov_base = (char *)write_data + total_written; | |
1753 | iov[1].iov_len = len; | |
fa2989f4 | 1754 | io_parms.pid = pid; |
ba9ad725 PS |
1755 | io_parms.tcon = tcon; |
1756 | io_parms.offset = *offset; | |
fa2989f4 | 1757 | io_parms.length = len; |
db8b631d SF |
1758 | rc = server->ops->sync_write(xid, &open_file->fid, |
1759 | &io_parms, &bytes_written, iov, 1); | |
1da177e4 LT |
1760 | } |
1761 | if (rc || (bytes_written == 0)) { | |
1762 | if (total_written) | |
1763 | break; | |
1764 | else { | |
6d5786a3 | 1765 | free_xid(xid); |
1da177e4 LT |
1766 | return rc; |
1767 | } | |
fbec9ab9 | 1768 | } else { |
2b0143b5 | 1769 | spin_lock(&d_inode(dentry)->i_lock); |
ba9ad725 | 1770 | cifs_update_eof(cifsi, *offset, bytes_written); |
2b0143b5 | 1771 | spin_unlock(&d_inode(dentry)->i_lock); |
ba9ad725 | 1772 | *offset += bytes_written; |
fbec9ab9 | 1773 | } |
1da177e4 LT |
1774 | } |
1775 | ||
ba9ad725 | 1776 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1777 | |
7da4b49a | 1778 | if (total_written > 0) { |
2b0143b5 DH |
1779 | spin_lock(&d_inode(dentry)->i_lock); |
1780 | if (*offset > d_inode(dentry)->i_size) | |
1781 | i_size_write(d_inode(dentry), *offset); | |
1782 | spin_unlock(&d_inode(dentry)->i_lock); | |
1da177e4 | 1783 | } |
2b0143b5 | 1784 | mark_inode_dirty_sync(d_inode(dentry)); |
6d5786a3 | 1785 | free_xid(xid); |
1da177e4 LT |
1786 | return total_written; |
1787 | } | |
1788 | ||
6508d904 JL |
1789 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1790 | bool fsuid_only) | |
630f3f0c SF |
1791 | { |
1792 | struct cifsFileInfo *open_file = NULL; | |
6508d904 | 1793 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
3afca265 | 1794 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
6508d904 JL |
1795 | |
1796 | /* only filter by fsuid on multiuser mounts */ | |
1797 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1798 | fsuid_only = false; | |
630f3f0c | 1799 | |
3afca265 | 1800 | spin_lock(&tcon->open_file_lock); |
630f3f0c SF |
1801 | /* we could simply get the first_list_entry since write-only entries |
1802 | are always at the end of the list but since the first entry might | |
1803 | have a close pending, we go through the whole list */ | |
1804 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 1805 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 1806 | continue; |
2e396b83 | 1807 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1808 | if (!open_file->invalidHandle) { |
1809 | /* found a good file */ | |
1810 | /* lock it so it will not be closed on us */ | |
3afca265 SF |
1811 | cifsFileInfo_get(open_file); |
1812 | spin_unlock(&tcon->open_file_lock); | |
630f3f0c SF |
1813 | return open_file; |
1814 | } /* else might as well continue, and look for | |
1815 | another, or simply have the caller reopen it | |
1816 | again rather than trying to fix this handle */ | |
1817 | } else /* write only file */ | |
1818 | break; /* write only files are last so must be done */ | |
1819 | } | |
3afca265 | 1820 | spin_unlock(&tcon->open_file_lock); |
630f3f0c SF |
1821 | return NULL; |
1822 | } | |
630f3f0c | 1823 | |
6508d904 JL |
1824 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1825 | bool fsuid_only) | |
6148a742 | 1826 | { |
2c0c2a08 | 1827 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1828 | struct cifs_sb_info *cifs_sb; |
3afca265 | 1829 | struct cifs_tcon *tcon; |
2846d386 | 1830 | bool any_available = false; |
dd99cd80 | 1831 | int rc; |
2c0c2a08 | 1832 | unsigned int refind = 0; |
6148a742 | 1833 | |
60808233 SF |
1834 | /* Having a null inode here (because mapping->host was set to zero by |
1835 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1836 | it being zero) during stress testcases so we need to check for it */ | |
1837 | ||
fb8c4b14 | 1838 | if (cifs_inode == NULL) { |
f96637be | 1839 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 SF |
1840 | dump_stack(); |
1841 | return NULL; | |
1842 | } | |
1843 | ||
d3892294 | 1844 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
3afca265 | 1845 | tcon = cifs_sb_master_tcon(cifs_sb); |
d3892294 | 1846 | |
6508d904 JL |
1847 | /* only filter by fsuid on multiuser mounts */ |
1848 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1849 | fsuid_only = false; | |
1850 | ||
3afca265 | 1851 | spin_lock(&tcon->open_file_lock); |
9b22b0b7 | 1852 | refind_writable: |
2c0c2a08 | 1853 | if (refind > MAX_REOPEN_ATT) { |
3afca265 | 1854 | spin_unlock(&tcon->open_file_lock); |
2c0c2a08 SP |
1855 | return NULL; |
1856 | } | |
6148a742 | 1857 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1858 | if (!any_available && open_file->pid != current->tgid) |
1859 | continue; | |
fef59fd7 | 1860 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 1861 | continue; |
2e396b83 | 1862 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1863 | if (!open_file->invalidHandle) { |
1864 | /* found a good writable file */ | |
3afca265 SF |
1865 | cifsFileInfo_get(open_file); |
1866 | spin_unlock(&tcon->open_file_lock); | |
9b22b0b7 | 1867 | return open_file; |
2c0c2a08 SP |
1868 | } else { |
1869 | if (!inv_file) | |
1870 | inv_file = open_file; | |
9b22b0b7 | 1871 | } |
6148a742 SF |
1872 | } |
1873 | } | |
2846d386 JL |
1874 | /* couldn't find useable FH with same pid, try any available */ |
1875 | if (!any_available) { | |
1876 | any_available = true; | |
1877 | goto refind_writable; | |
1878 | } | |
2c0c2a08 SP |
1879 | |
1880 | if (inv_file) { | |
1881 | any_available = false; | |
3afca265 | 1882 | cifsFileInfo_get(inv_file); |
2c0c2a08 SP |
1883 | } |
1884 | ||
3afca265 | 1885 | spin_unlock(&tcon->open_file_lock); |
2c0c2a08 SP |
1886 | |
1887 | if (inv_file) { | |
1888 | rc = cifs_reopen_file(inv_file, false); | |
1889 | if (!rc) | |
1890 | return inv_file; | |
1891 | else { | |
3afca265 | 1892 | spin_lock(&tcon->open_file_lock); |
2c0c2a08 SP |
1893 | list_move_tail(&inv_file->flist, |
1894 | &cifs_inode->openFileList); | |
3afca265 | 1895 | spin_unlock(&tcon->open_file_lock); |
2c0c2a08 | 1896 | cifsFileInfo_put(inv_file); |
2c0c2a08 | 1897 | ++refind; |
e1e9bda2 | 1898 | inv_file = NULL; |
3afca265 | 1899 | spin_lock(&tcon->open_file_lock); |
2c0c2a08 SP |
1900 | goto refind_writable; |
1901 | } | |
1902 | } | |
1903 | ||
6148a742 SF |
1904 | return NULL; |
1905 | } | |
1906 | ||
1da177e4 LT |
1907 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1908 | { | |
1909 | struct address_space *mapping = page->mapping; | |
09cbfeaf | 1910 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
1da177e4 LT |
1911 | char *write_data; |
1912 | int rc = -EFAULT; | |
1913 | int bytes_written = 0; | |
1da177e4 | 1914 | struct inode *inode; |
6148a742 | 1915 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1916 | |
1917 | if (!mapping || !mapping->host) | |
1918 | return -EFAULT; | |
1919 | ||
1920 | inode = page->mapping->host; | |
1da177e4 LT |
1921 | |
1922 | offset += (loff_t)from; | |
1923 | write_data = kmap(page); | |
1924 | write_data += from; | |
1925 | ||
09cbfeaf | 1926 | if ((to > PAGE_SIZE) || (from > to)) { |
1da177e4 LT |
1927 | kunmap(page); |
1928 | return -EIO; | |
1929 | } | |
1930 | ||
1931 | /* racing with truncate? */ | |
1932 | if (offset > mapping->host->i_size) { | |
1933 | kunmap(page); | |
1934 | return 0; /* don't care */ | |
1935 | } | |
1936 | ||
1937 | /* check to make sure that we are not extending the file */ | |
1938 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1939 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1940 | |
6508d904 | 1941 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1942 | if (open_file) { |
fa2989f4 PS |
1943 | bytes_written = cifs_write(open_file, open_file->pid, |
1944 | write_data, to - from, &offset); | |
6ab409b5 | 1945 | cifsFileInfo_put(open_file); |
1da177e4 | 1946 | /* Does mm or vfs already set times? */ |
c2050a45 | 1947 | inode->i_atime = inode->i_mtime = current_time(inode); |
bb5a9a04 | 1948 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1949 | rc = 0; |
bb5a9a04 SF |
1950 | else if (bytes_written < 0) |
1951 | rc = bytes_written; | |
6148a742 | 1952 | } else { |
f96637be | 1953 | cifs_dbg(FYI, "No writeable filehandles for inode\n"); |
1da177e4 LT |
1954 | rc = -EIO; |
1955 | } | |
1956 | ||
1957 | kunmap(page); | |
1958 | return rc; | |
1959 | } | |
1960 | ||
90ac1387 PS |
1961 | static struct cifs_writedata * |
1962 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, | |
1963 | pgoff_t end, pgoff_t *index, | |
1964 | unsigned int *found_pages) | |
1965 | { | |
90ac1387 PS |
1966 | struct cifs_writedata *wdata; |
1967 | ||
1968 | wdata = cifs_writedata_alloc((unsigned int)tofind, | |
1969 | cifs_writev_complete); | |
1970 | if (!wdata) | |
1971 | return NULL; | |
1972 | ||
9c19a9cb JK |
1973 | *found_pages = find_get_pages_range_tag(mapping, index, end, |
1974 | PAGECACHE_TAG_DIRTY, tofind, wdata->pages); | |
90ac1387 PS |
1975 | return wdata; |
1976 | } | |
1977 | ||
7e48ff82 PS |
1978 | static unsigned int |
1979 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, | |
1980 | struct address_space *mapping, | |
1981 | struct writeback_control *wbc, | |
1982 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) | |
1983 | { | |
1984 | unsigned int nr_pages = 0, i; | |
1985 | struct page *page; | |
1986 | ||
1987 | for (i = 0; i < found_pages; i++) { | |
1988 | page = wdata->pages[i]; | |
1989 | /* | |
1990 | * At this point we hold neither mapping->tree_lock nor | |
1991 | * lock on the page itself: the page may be truncated or | |
1992 | * invalidated (changing page->mapping to NULL), or even | |
1993 | * swizzled back from swapper_space to tmpfs file | |
1994 | * mapping | |
1995 | */ | |
1996 | ||
1997 | if (nr_pages == 0) | |
1998 | lock_page(page); | |
1999 | else if (!trylock_page(page)) | |
2000 | break; | |
2001 | ||
2002 | if (unlikely(page->mapping != mapping)) { | |
2003 | unlock_page(page); | |
2004 | break; | |
2005 | } | |
2006 | ||
2007 | if (!wbc->range_cyclic && page->index > end) { | |
2008 | *done = true; | |
2009 | unlock_page(page); | |
2010 | break; | |
2011 | } | |
2012 | ||
2013 | if (*next && (page->index != *next)) { | |
2014 | /* Not next consecutive page */ | |
2015 | unlock_page(page); | |
2016 | break; | |
2017 | } | |
2018 | ||
2019 | if (wbc->sync_mode != WB_SYNC_NONE) | |
2020 | wait_on_page_writeback(page); | |
2021 | ||
2022 | if (PageWriteback(page) || | |
2023 | !clear_page_dirty_for_io(page)) { | |
2024 | unlock_page(page); | |
2025 | break; | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * This actually clears the dirty bit in the radix tree. | |
2030 | * See cifs_writepage() for more commentary. | |
2031 | */ | |
2032 | set_page_writeback(page); | |
2033 | if (page_offset(page) >= i_size_read(mapping->host)) { | |
2034 | *done = true; | |
2035 | unlock_page(page); | |
2036 | end_page_writeback(page); | |
2037 | break; | |
2038 | } | |
2039 | ||
2040 | wdata->pages[i] = page; | |
2041 | *next = page->index + 1; | |
2042 | ++nr_pages; | |
2043 | } | |
2044 | ||
2045 | /* reset index to refind any pages skipped */ | |
2046 | if (nr_pages == 0) | |
2047 | *index = wdata->pages[0]->index + 1; | |
2048 | ||
2049 | /* put any pages we aren't going to use */ | |
2050 | for (i = nr_pages; i < found_pages; i++) { | |
09cbfeaf | 2051 | put_page(wdata->pages[i]); |
7e48ff82 PS |
2052 | wdata->pages[i] = NULL; |
2053 | } | |
2054 | ||
2055 | return nr_pages; | |
2056 | } | |
2057 | ||
619aa48e PS |
2058 | static int |
2059 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, | |
2060 | struct address_space *mapping, struct writeback_control *wbc) | |
2061 | { | |
2062 | int rc = 0; | |
2063 | struct TCP_Server_Info *server; | |
2064 | unsigned int i; | |
2065 | ||
2066 | wdata->sync_mode = wbc->sync_mode; | |
2067 | wdata->nr_pages = nr_pages; | |
2068 | wdata->offset = page_offset(wdata->pages[0]); | |
09cbfeaf | 2069 | wdata->pagesz = PAGE_SIZE; |
619aa48e PS |
2070 | wdata->tailsz = min(i_size_read(mapping->host) - |
2071 | page_offset(wdata->pages[nr_pages - 1]), | |
09cbfeaf KS |
2072 | (loff_t)PAGE_SIZE); |
2073 | wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz; | |
619aa48e | 2074 | |
66231a47 PS |
2075 | if (wdata->cfile != NULL) |
2076 | cifsFileInfo_put(wdata->cfile); | |
2077 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), false); | |
2078 | if (!wdata->cfile) { | |
2079 | cifs_dbg(VFS, "No writable handles for inode\n"); | |
2080 | rc = -EBADF; | |
2081 | } else { | |
619aa48e PS |
2082 | wdata->pid = wdata->cfile->pid; |
2083 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
2084 | rc = server->ops->async_writev(wdata, cifs_writedata_release); | |
66231a47 | 2085 | } |
619aa48e PS |
2086 | |
2087 | for (i = 0; i < nr_pages; ++i) | |
2088 | unlock_page(wdata->pages[i]); | |
2089 | ||
2090 | return rc; | |
2091 | } | |
2092 | ||
1da177e4 | 2093 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 2094 | struct writeback_control *wbc) |
1da177e4 | 2095 | { |
c3d17b63 | 2096 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
cb7e9eab | 2097 | struct TCP_Server_Info *server; |
c3d17b63 JL |
2098 | bool done = false, scanned = false, range_whole = false; |
2099 | pgoff_t end, index; | |
2100 | struct cifs_writedata *wdata; | |
37c0eb46 | 2101 | int rc = 0; |
50c2f753 | 2102 | |
37c0eb46 | 2103 | /* |
c3d17b63 | 2104 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
2105 | * one page at a time via cifs_writepage |
2106 | */ | |
09cbfeaf | 2107 | if (cifs_sb->wsize < PAGE_SIZE) |
37c0eb46 SF |
2108 | return generic_writepages(mapping, wbc); |
2109 | ||
111ebb6e | 2110 | if (wbc->range_cyclic) { |
37c0eb46 | 2111 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
2112 | end = -1; |
2113 | } else { | |
09cbfeaf KS |
2114 | index = wbc->range_start >> PAGE_SHIFT; |
2115 | end = wbc->range_end >> PAGE_SHIFT; | |
111ebb6e | 2116 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
c3d17b63 JL |
2117 | range_whole = true; |
2118 | scanned = true; | |
37c0eb46 | 2119 | } |
cb7e9eab | 2120 | server = cifs_sb_master_tcon(cifs_sb)->ses->server; |
37c0eb46 | 2121 | retry: |
c3d17b63 | 2122 | while (!done && index <= end) { |
cb7e9eab | 2123 | unsigned int i, nr_pages, found_pages, wsize, credits; |
66231a47 | 2124 | pgoff_t next = 0, tofind, saved_index = index; |
c3d17b63 | 2125 | |
cb7e9eab PS |
2126 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, |
2127 | &wsize, &credits); | |
2128 | if (rc) | |
2129 | break; | |
c3d17b63 | 2130 | |
09cbfeaf | 2131 | tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1; |
c3d17b63 | 2132 | |
90ac1387 PS |
2133 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
2134 | &found_pages); | |
c3d17b63 JL |
2135 | if (!wdata) { |
2136 | rc = -ENOMEM; | |
cb7e9eab | 2137 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2138 | break; |
2139 | } | |
2140 | ||
c3d17b63 JL |
2141 | if (found_pages == 0) { |
2142 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2143 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2144 | break; |
2145 | } | |
2146 | ||
7e48ff82 PS |
2147 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
2148 | end, &index, &next, &done); | |
37c0eb46 | 2149 | |
c3d17b63 JL |
2150 | /* nothing to write? */ |
2151 | if (nr_pages == 0) { | |
2152 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2153 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 | 2154 | continue; |
37c0eb46 | 2155 | } |
fbec9ab9 | 2156 | |
cb7e9eab | 2157 | wdata->credits = credits; |
941b853d | 2158 | |
619aa48e | 2159 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); |
f3983c21 | 2160 | |
c3d17b63 JL |
2161 | /* send failure -- clean up the mess */ |
2162 | if (rc != 0) { | |
cb7e9eab | 2163 | add_credits_and_wake_if(server, wdata->credits, 0); |
c3d17b63 | 2164 | for (i = 0; i < nr_pages; ++i) { |
941b853d | 2165 | if (rc == -EAGAIN) |
c3d17b63 JL |
2166 | redirty_page_for_writepage(wbc, |
2167 | wdata->pages[i]); | |
2168 | else | |
2169 | SetPageError(wdata->pages[i]); | |
2170 | end_page_writeback(wdata->pages[i]); | |
09cbfeaf | 2171 | put_page(wdata->pages[i]); |
37c0eb46 | 2172 | } |
941b853d JL |
2173 | if (rc != -EAGAIN) |
2174 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
2175 | } |
2176 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2177 | |
66231a47 PS |
2178 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
2179 | index = saved_index; | |
2180 | continue; | |
2181 | } | |
2182 | ||
c3d17b63 JL |
2183 | wbc->nr_to_write -= nr_pages; |
2184 | if (wbc->nr_to_write <= 0) | |
2185 | done = true; | |
b066a48c | 2186 | |
c3d17b63 | 2187 | index = next; |
37c0eb46 | 2188 | } |
c3d17b63 | 2189 | |
37c0eb46 SF |
2190 | if (!scanned && !done) { |
2191 | /* | |
2192 | * We hit the last page and there is more work to be done: wrap | |
2193 | * back to the start of the file | |
2194 | */ | |
c3d17b63 | 2195 | scanned = true; |
37c0eb46 SF |
2196 | index = 0; |
2197 | goto retry; | |
2198 | } | |
c3d17b63 | 2199 | |
111ebb6e | 2200 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2201 | mapping->writeback_index = index; |
2202 | ||
1da177e4 LT |
2203 | return rc; |
2204 | } | |
1da177e4 | 2205 | |
9ad1506b PS |
2206 | static int |
2207 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2208 | { |
9ad1506b | 2209 | int rc; |
6d5786a3 | 2210 | unsigned int xid; |
1da177e4 | 2211 | |
6d5786a3 | 2212 | xid = get_xid(); |
1da177e4 | 2213 | /* BB add check for wbc flags */ |
09cbfeaf | 2214 | get_page(page); |
ad7a2926 | 2215 | if (!PageUptodate(page)) |
f96637be | 2216 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2217 | |
2218 | /* | |
2219 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2220 | * | |
2221 | * A writepage() implementation always needs to do either this, | |
2222 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2223 | * the case of a failure. | |
2224 | * | |
2225 | * Just unlocking the page will cause the radix tree tag-bits | |
2226 | * to fail to update with the state of the page correctly. | |
2227 | */ | |
fb8c4b14 | 2228 | set_page_writeback(page); |
9ad1506b | 2229 | retry_write: |
09cbfeaf | 2230 | rc = cifs_partialpagewrite(page, 0, PAGE_SIZE); |
97b37f24 JL |
2231 | if (rc == -EAGAIN) { |
2232 | if (wbc->sync_mode == WB_SYNC_ALL) | |
2233 | goto retry_write; | |
9ad1506b | 2234 | redirty_page_for_writepage(wbc, page); |
97b37f24 | 2235 | } else if (rc != 0) { |
9ad1506b | 2236 | SetPageError(page); |
97b37f24 JL |
2237 | mapping_set_error(page->mapping, rc); |
2238 | } else { | |
9ad1506b | 2239 | SetPageUptodate(page); |
97b37f24 | 2240 | } |
cb876f45 | 2241 | end_page_writeback(page); |
09cbfeaf | 2242 | put_page(page); |
6d5786a3 | 2243 | free_xid(xid); |
1da177e4 LT |
2244 | return rc; |
2245 | } | |
2246 | ||
9ad1506b PS |
2247 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2248 | { | |
2249 | int rc = cifs_writepage_locked(page, wbc); | |
2250 | unlock_page(page); | |
2251 | return rc; | |
2252 | } | |
2253 | ||
d9414774 NP |
2254 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2255 | loff_t pos, unsigned len, unsigned copied, | |
2256 | struct page *page, void *fsdata) | |
1da177e4 | 2257 | { |
d9414774 NP |
2258 | int rc; |
2259 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2260 | struct cifsFileInfo *cfile = file->private_data; |
2261 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2262 | __u32 pid; | |
2263 | ||
2264 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2265 | pid = cfile->pid; | |
2266 | else | |
2267 | pid = current->tgid; | |
1da177e4 | 2268 | |
f96637be | 2269 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2270 | page, pos, copied); |
d9414774 | 2271 | |
a98ee8c1 JL |
2272 | if (PageChecked(page)) { |
2273 | if (copied == len) | |
2274 | SetPageUptodate(page); | |
2275 | ClearPageChecked(page); | |
09cbfeaf | 2276 | } else if (!PageUptodate(page) && copied == PAGE_SIZE) |
d9414774 | 2277 | SetPageUptodate(page); |
ad7a2926 | 2278 | |
1da177e4 | 2279 | if (!PageUptodate(page)) { |
d9414774 | 2280 | char *page_data; |
09cbfeaf | 2281 | unsigned offset = pos & (PAGE_SIZE - 1); |
6d5786a3 | 2282 | unsigned int xid; |
d9414774 | 2283 | |
6d5786a3 | 2284 | xid = get_xid(); |
1da177e4 LT |
2285 | /* this is probably better than directly calling |
2286 | partialpage_write since in this function the file handle is | |
2287 | known which we might as well leverage */ | |
2288 | /* BB check if anything else missing out of ppw | |
2289 | such as updating last write time */ | |
2290 | page_data = kmap(page); | |
d4ffff1f | 2291 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2292 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2293 | kunmap(page); |
d9414774 | 2294 | |
6d5786a3 | 2295 | free_xid(xid); |
fb8c4b14 | 2296 | } else { |
d9414774 NP |
2297 | rc = copied; |
2298 | pos += copied; | |
ca8aa29c | 2299 | set_page_dirty(page); |
1da177e4 LT |
2300 | } |
2301 | ||
d9414774 NP |
2302 | if (rc > 0) { |
2303 | spin_lock(&inode->i_lock); | |
2304 | if (pos > inode->i_size) | |
2305 | i_size_write(inode, pos); | |
2306 | spin_unlock(&inode->i_lock); | |
2307 | } | |
2308 | ||
2309 | unlock_page(page); | |
09cbfeaf | 2310 | put_page(page); |
d9414774 | 2311 | |
1da177e4 LT |
2312 | return rc; |
2313 | } | |
2314 | ||
02c24a82 JB |
2315 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2316 | int datasync) | |
1da177e4 | 2317 | { |
6d5786a3 | 2318 | unsigned int xid; |
1da177e4 | 2319 | int rc = 0; |
96daf2b0 | 2320 | struct cifs_tcon *tcon; |
1d8c4c00 | 2321 | struct TCP_Server_Info *server; |
c21dfb69 | 2322 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2323 | struct inode *inode = file_inode(file); |
8be7e6ba | 2324 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2325 | |
3b49c9a1 | 2326 | rc = file_write_and_wait_range(file, start, end); |
02c24a82 JB |
2327 | if (rc) |
2328 | return rc; | |
5955102c | 2329 | inode_lock(inode); |
02c24a82 | 2330 | |
6d5786a3 | 2331 | xid = get_xid(); |
1da177e4 | 2332 | |
35c265e0 AV |
2333 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2334 | file, datasync); | |
50c2f753 | 2335 | |
18cceb6a | 2336 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 2337 | rc = cifs_zap_mapping(inode); |
6feb9891 | 2338 | if (rc) { |
f96637be | 2339 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2340 | rc = 0; /* don't care about it in fsync */ |
2341 | } | |
2342 | } | |
eb4b756b | 2343 | |
8be7e6ba | 2344 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2345 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2346 | server = tcon->ses->server; | |
2347 | if (server->ops->flush) | |
2348 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2349 | else | |
2350 | rc = -ENOSYS; | |
2351 | } | |
8be7e6ba | 2352 | |
6d5786a3 | 2353 | free_xid(xid); |
5955102c | 2354 | inode_unlock(inode); |
8be7e6ba PS |
2355 | return rc; |
2356 | } | |
2357 | ||
02c24a82 | 2358 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2359 | { |
6d5786a3 | 2360 | unsigned int xid; |
8be7e6ba | 2361 | int rc = 0; |
96daf2b0 | 2362 | struct cifs_tcon *tcon; |
1d8c4c00 | 2363 | struct TCP_Server_Info *server; |
8be7e6ba | 2364 | struct cifsFileInfo *smbfile = file->private_data; |
7119e220 | 2365 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
02c24a82 JB |
2366 | struct inode *inode = file->f_mapping->host; |
2367 | ||
3b49c9a1 | 2368 | rc = file_write_and_wait_range(file, start, end); |
02c24a82 JB |
2369 | if (rc) |
2370 | return rc; | |
5955102c | 2371 | inode_lock(inode); |
8be7e6ba | 2372 | |
6d5786a3 | 2373 | xid = get_xid(); |
8be7e6ba | 2374 | |
35c265e0 AV |
2375 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2376 | file, datasync); | |
8be7e6ba PS |
2377 | |
2378 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2379 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2380 | server = tcon->ses->server; | |
2381 | if (server->ops->flush) | |
2382 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2383 | else | |
2384 | rc = -ENOSYS; | |
2385 | } | |
b298f223 | 2386 | |
6d5786a3 | 2387 | free_xid(xid); |
5955102c | 2388 | inode_unlock(inode); |
1da177e4 LT |
2389 | return rc; |
2390 | } | |
2391 | ||
1da177e4 LT |
2392 | /* |
2393 | * As file closes, flush all cached write data for this inode checking | |
2394 | * for write behind errors. | |
2395 | */ | |
75e1fcc0 | 2396 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2397 | { |
496ad9aa | 2398 | struct inode *inode = file_inode(file); |
1da177e4 LT |
2399 | int rc = 0; |
2400 | ||
eb4b756b | 2401 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2402 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2403 | |
f96637be | 2404 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
1da177e4 LT |
2405 | |
2406 | return rc; | |
2407 | } | |
2408 | ||
72432ffc PS |
2409 | static int |
2410 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2411 | { | |
2412 | int rc = 0; | |
2413 | unsigned long i; | |
2414 | ||
2415 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2416 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2417 | if (!pages[i]) { |
2418 | /* | |
2419 | * save number of pages we have already allocated and | |
2420 | * return with ENOMEM error | |
2421 | */ | |
2422 | num_pages = i; | |
2423 | rc = -ENOMEM; | |
e94f7ba1 | 2424 | break; |
72432ffc PS |
2425 | } |
2426 | } | |
2427 | ||
e94f7ba1 JL |
2428 | if (rc) { |
2429 | for (i = 0; i < num_pages; i++) | |
2430 | put_page(pages[i]); | |
2431 | } | |
72432ffc PS |
2432 | return rc; |
2433 | } | |
2434 | ||
2435 | static inline | |
2436 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2437 | { | |
2438 | size_t num_pages; | |
2439 | size_t clen; | |
2440 | ||
2441 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2442 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2443 | |
2444 | if (cur_len) | |
2445 | *cur_len = clen; | |
2446 | ||
2447 | return num_pages; | |
2448 | } | |
2449 | ||
da82f7e7 | 2450 | static void |
4a5c80d7 | 2451 | cifs_uncached_writedata_release(struct kref *refcount) |
da82f7e7 JL |
2452 | { |
2453 | int i; | |
4a5c80d7 SF |
2454 | struct cifs_writedata *wdata = container_of(refcount, |
2455 | struct cifs_writedata, refcount); | |
2456 | ||
c610c4b6 | 2457 | kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release); |
4a5c80d7 SF |
2458 | for (i = 0; i < wdata->nr_pages; i++) |
2459 | put_page(wdata->pages[i]); | |
2460 | cifs_writedata_release(refcount); | |
2461 | } | |
2462 | ||
c610c4b6 PS |
2463 | static void collect_uncached_write_data(struct cifs_aio_ctx *ctx); |
2464 | ||
4a5c80d7 SF |
2465 | static void |
2466 | cifs_uncached_writev_complete(struct work_struct *work) | |
2467 | { | |
da82f7e7 JL |
2468 | struct cifs_writedata *wdata = container_of(work, |
2469 | struct cifs_writedata, work); | |
2b0143b5 | 2470 | struct inode *inode = d_inode(wdata->cfile->dentry); |
da82f7e7 JL |
2471 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
2472 | ||
2473 | spin_lock(&inode->i_lock); | |
2474 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2475 | if (cifsi->server_eof > inode->i_size) | |
2476 | i_size_write(inode, cifsi->server_eof); | |
2477 | spin_unlock(&inode->i_lock); | |
2478 | ||
2479 | complete(&wdata->done); | |
c610c4b6 PS |
2480 | collect_uncached_write_data(wdata->ctx); |
2481 | /* the below call can possibly free the last ref to aio ctx */ | |
4a5c80d7 | 2482 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
da82f7e7 JL |
2483 | } |
2484 | ||
da82f7e7 | 2485 | static int |
66386c08 PS |
2486 | wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from, |
2487 | size_t *len, unsigned long *num_pages) | |
da82f7e7 | 2488 | { |
66386c08 PS |
2489 | size_t save_len, copied, bytes, cur_len = *len; |
2490 | unsigned long i, nr_pages = *num_pages; | |
c9de5c80 | 2491 | |
66386c08 PS |
2492 | save_len = cur_len; |
2493 | for (i = 0; i < nr_pages; i++) { | |
2494 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); | |
2495 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from); | |
2496 | cur_len -= copied; | |
2497 | /* | |
2498 | * If we didn't copy as much as we expected, then that | |
2499 | * may mean we trod into an unmapped area. Stop copying | |
2500 | * at that point. On the next pass through the big | |
2501 | * loop, we'll likely end up getting a zero-length | |
2502 | * write and bailing out of it. | |
2503 | */ | |
2504 | if (copied < bytes) | |
2505 | break; | |
2506 | } | |
2507 | cur_len = save_len - cur_len; | |
2508 | *len = cur_len; | |
da82f7e7 | 2509 | |
66386c08 PS |
2510 | /* |
2511 | * If we have no data to send, then that probably means that | |
2512 | * the copy above failed altogether. That's most likely because | |
2513 | * the address in the iovec was bogus. Return -EFAULT and let | |
2514 | * the caller free anything we allocated and bail out. | |
2515 | */ | |
2516 | if (!cur_len) | |
2517 | return -EFAULT; | |
da82f7e7 | 2518 | |
66386c08 PS |
2519 | /* |
2520 | * i + 1 now represents the number of pages we actually used in | |
2521 | * the copy phase above. | |
2522 | */ | |
2523 | *num_pages = i + 1; | |
2524 | return 0; | |
da82f7e7 JL |
2525 | } |
2526 | ||
43de94ea PS |
2527 | static int |
2528 | cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, | |
2529 | struct cifsFileInfo *open_file, | |
c610c4b6 PS |
2530 | struct cifs_sb_info *cifs_sb, struct list_head *wdata_list, |
2531 | struct cifs_aio_ctx *ctx) | |
72432ffc | 2532 | { |
43de94ea PS |
2533 | int rc = 0; |
2534 | size_t cur_len; | |
66386c08 | 2535 | unsigned long nr_pages, num_pages, i; |
43de94ea | 2536 | struct cifs_writedata *wdata; |
fc56b983 | 2537 | struct iov_iter saved_from = *from; |
6ec0b01b | 2538 | loff_t saved_offset = offset; |
da82f7e7 | 2539 | pid_t pid; |
6ec0b01b | 2540 | struct TCP_Server_Info *server; |
d4ffff1f PS |
2541 | |
2542 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2543 | pid = open_file->pid; | |
2544 | else | |
2545 | pid = current->tgid; | |
2546 | ||
6ec0b01b | 2547 | server = tlink_tcon(open_file->tlink)->ses->server; |
6ec0b01b | 2548 | |
72432ffc | 2549 | do { |
cb7e9eab PS |
2550 | unsigned int wsize, credits; |
2551 | ||
2552 | rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, | |
2553 | &wsize, &credits); | |
2554 | if (rc) | |
2555 | break; | |
da82f7e7 | 2556 | |
cb7e9eab | 2557 | nr_pages = get_numpages(wsize, len, &cur_len); |
da82f7e7 JL |
2558 | wdata = cifs_writedata_alloc(nr_pages, |
2559 | cifs_uncached_writev_complete); | |
2560 | if (!wdata) { | |
2561 | rc = -ENOMEM; | |
cb7e9eab | 2562 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2563 | break; |
2564 | } | |
2565 | ||
2566 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2567 | if (rc) { | |
2568 | kfree(wdata); | |
cb7e9eab | 2569 | add_credits_and_wake_if(server, credits, 0); |
da82f7e7 JL |
2570 | break; |
2571 | } | |
2572 | ||
66386c08 PS |
2573 | num_pages = nr_pages; |
2574 | rc = wdata_fill_from_iovec(wdata, from, &cur_len, &num_pages); | |
2575 | if (rc) { | |
5d81de8e JL |
2576 | for (i = 0; i < nr_pages; i++) |
2577 | put_page(wdata->pages[i]); | |
2578 | kfree(wdata); | |
cb7e9eab | 2579 | add_credits_and_wake_if(server, credits, 0); |
5d81de8e JL |
2580 | break; |
2581 | } | |
2582 | ||
2583 | /* | |
66386c08 PS |
2584 | * Bring nr_pages down to the number of pages we actually used, |
2585 | * and free any pages that we didn't use. | |
5d81de8e | 2586 | */ |
66386c08 | 2587 | for ( ; nr_pages > num_pages; nr_pages--) |
5d81de8e JL |
2588 | put_page(wdata->pages[nr_pages - 1]); |
2589 | ||
da82f7e7 JL |
2590 | wdata->sync_mode = WB_SYNC_ALL; |
2591 | wdata->nr_pages = nr_pages; | |
2592 | wdata->offset = (__u64)offset; | |
2593 | wdata->cfile = cifsFileInfo_get(open_file); | |
2594 | wdata->pid = pid; | |
2595 | wdata->bytes = cur_len; | |
eddb079d JL |
2596 | wdata->pagesz = PAGE_SIZE; |
2597 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
cb7e9eab | 2598 | wdata->credits = credits; |
c610c4b6 PS |
2599 | wdata->ctx = ctx; |
2600 | kref_get(&ctx->refcount); | |
6ec0b01b PS |
2601 | |
2602 | if (!wdata->cfile->invalidHandle || | |
1fa839b4 | 2603 | !(rc = cifs_reopen_file(wdata->cfile, false))) |
6ec0b01b PS |
2604 | rc = server->ops->async_writev(wdata, |
2605 | cifs_uncached_writedata_release); | |
da82f7e7 | 2606 | if (rc) { |
cb7e9eab | 2607 | add_credits_and_wake_if(server, wdata->credits, 0); |
4a5c80d7 SF |
2608 | kref_put(&wdata->refcount, |
2609 | cifs_uncached_writedata_release); | |
6ec0b01b | 2610 | if (rc == -EAGAIN) { |
fc56b983 | 2611 | *from = saved_from; |
6ec0b01b PS |
2612 | iov_iter_advance(from, offset - saved_offset); |
2613 | continue; | |
2614 | } | |
72432ffc PS |
2615 | break; |
2616 | } | |
2617 | ||
43de94ea | 2618 | list_add_tail(&wdata->list, wdata_list); |
da82f7e7 JL |
2619 | offset += cur_len; |
2620 | len -= cur_len; | |
72432ffc PS |
2621 | } while (len > 0); |
2622 | ||
43de94ea PS |
2623 | return rc; |
2624 | } | |
2625 | ||
c610c4b6 | 2626 | static void collect_uncached_write_data(struct cifs_aio_ctx *ctx) |
43de94ea | 2627 | { |
c610c4b6 | 2628 | struct cifs_writedata *wdata, *tmp; |
43de94ea PS |
2629 | struct cifs_tcon *tcon; |
2630 | struct cifs_sb_info *cifs_sb; | |
c610c4b6 PS |
2631 | struct dentry *dentry = ctx->cfile->dentry; |
2632 | unsigned int i; | |
43de94ea PS |
2633 | int rc; |
2634 | ||
c610c4b6 PS |
2635 | tcon = tlink_tcon(ctx->cfile->tlink); |
2636 | cifs_sb = CIFS_SB(dentry->d_sb); | |
43de94ea | 2637 | |
c610c4b6 | 2638 | mutex_lock(&ctx->aio_mutex); |
43de94ea | 2639 | |
c610c4b6 PS |
2640 | if (list_empty(&ctx->list)) { |
2641 | mutex_unlock(&ctx->aio_mutex); | |
2642 | return; | |
2643 | } | |
da82f7e7 | 2644 | |
c610c4b6 | 2645 | rc = ctx->rc; |
da82f7e7 JL |
2646 | /* |
2647 | * Wait for and collect replies for any successful sends in order of | |
c610c4b6 PS |
2648 | * increasing offset. Once an error is hit, then return without waiting |
2649 | * for any more replies. | |
da82f7e7 JL |
2650 | */ |
2651 | restart_loop: | |
c610c4b6 | 2652 | list_for_each_entry_safe(wdata, tmp, &ctx->list, list) { |
da82f7e7 | 2653 | if (!rc) { |
c610c4b6 PS |
2654 | if (!try_wait_for_completion(&wdata->done)) { |
2655 | mutex_unlock(&ctx->aio_mutex); | |
2656 | return; | |
2657 | } | |
2658 | ||
2659 | if (wdata->result) | |
da82f7e7 JL |
2660 | rc = wdata->result; |
2661 | else | |
c610c4b6 | 2662 | ctx->total_len += wdata->bytes; |
da82f7e7 JL |
2663 | |
2664 | /* resend call if it's a retryable error */ | |
2665 | if (rc == -EAGAIN) { | |
6ec0b01b | 2666 | struct list_head tmp_list; |
c610c4b6 | 2667 | struct iov_iter tmp_from = ctx->iter; |
6ec0b01b PS |
2668 | |
2669 | INIT_LIST_HEAD(&tmp_list); | |
2670 | list_del_init(&wdata->list); | |
2671 | ||
6ec0b01b | 2672 | iov_iter_advance(&tmp_from, |
c610c4b6 | 2673 | wdata->offset - ctx->pos); |
6ec0b01b PS |
2674 | |
2675 | rc = cifs_write_from_iter(wdata->offset, | |
2676 | wdata->bytes, &tmp_from, | |
c610c4b6 PS |
2677 | ctx->cfile, cifs_sb, &tmp_list, |
2678 | ctx); | |
6ec0b01b | 2679 | |
c610c4b6 | 2680 | list_splice(&tmp_list, &ctx->list); |
6ec0b01b PS |
2681 | |
2682 | kref_put(&wdata->refcount, | |
2683 | cifs_uncached_writedata_release); | |
da82f7e7 JL |
2684 | goto restart_loop; |
2685 | } | |
2686 | } | |
2687 | list_del_init(&wdata->list); | |
4a5c80d7 | 2688 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
72432ffc PS |
2689 | } |
2690 | ||
c610c4b6 PS |
2691 | for (i = 0; i < ctx->npages; i++) |
2692 | put_page(ctx->bv[i].bv_page); | |
2693 | ||
2694 | cifs_stats_bytes_written(tcon, ctx->total_len); | |
2695 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags); | |
2696 | ||
2697 | ctx->rc = (rc == 0) ? ctx->total_len : rc; | |
2698 | ||
2699 | mutex_unlock(&ctx->aio_mutex); | |
2700 | ||
2701 | if (ctx->iocb && ctx->iocb->ki_complete) | |
2702 | ctx->iocb->ki_complete(ctx->iocb, ctx->rc, 0); | |
2703 | else | |
2704 | complete(&ctx->done); | |
2705 | } | |
2706 | ||
2707 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) | |
2708 | { | |
2709 | struct file *file = iocb->ki_filp; | |
2710 | ssize_t total_written = 0; | |
2711 | struct cifsFileInfo *cfile; | |
2712 | struct cifs_tcon *tcon; | |
2713 | struct cifs_sb_info *cifs_sb; | |
2714 | struct cifs_aio_ctx *ctx; | |
2715 | struct iov_iter saved_from = *from; | |
2716 | int rc; | |
2717 | ||
2718 | /* | |
2719 | * BB - optimize the way when signing is disabled. We can drop this | |
2720 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2721 | * write request. | |
2722 | */ | |
2723 | ||
2724 | rc = generic_write_checks(iocb, from); | |
2725 | if (rc <= 0) | |
2726 | return rc; | |
2727 | ||
2728 | cifs_sb = CIFS_FILE_SB(file); | |
2729 | cfile = file->private_data; | |
2730 | tcon = tlink_tcon(cfile->tlink); | |
2731 | ||
2732 | if (!tcon->ses->server->ops->async_writev) | |
2733 | return -ENOSYS; | |
2734 | ||
2735 | ctx = cifs_aio_ctx_alloc(); | |
2736 | if (!ctx) | |
2737 | return -ENOMEM; | |
2738 | ||
2739 | ctx->cfile = cifsFileInfo_get(cfile); | |
2740 | ||
2741 | if (!is_sync_kiocb(iocb)) | |
2742 | ctx->iocb = iocb; | |
2743 | ||
2744 | ctx->pos = iocb->ki_pos; | |
2745 | ||
2746 | rc = setup_aio_ctx_iter(ctx, from, WRITE); | |
2747 | if (rc) { | |
2748 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
2749 | return rc; | |
2750 | } | |
2751 | ||
2752 | /* grab a lock here due to read response handlers can access ctx */ | |
2753 | mutex_lock(&ctx->aio_mutex); | |
2754 | ||
2755 | rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &saved_from, | |
2756 | cfile, cifs_sb, &ctx->list, ctx); | |
2757 | ||
2758 | /* | |
2759 | * If at least one write was successfully sent, then discard any rc | |
2760 | * value from the later writes. If the other write succeeds, then | |
2761 | * we'll end up returning whatever was written. If it fails, then | |
2762 | * we'll get a new rc value from that. | |
2763 | */ | |
2764 | if (!list_empty(&ctx->list)) | |
2765 | rc = 0; | |
2766 | ||
2767 | mutex_unlock(&ctx->aio_mutex); | |
2768 | ||
2769 | if (rc) { | |
2770 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
2771 | return rc; | |
2772 | } | |
2773 | ||
2774 | if (!is_sync_kiocb(iocb)) { | |
2775 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
2776 | return -EIOCBQUEUED; | |
2777 | } | |
2778 | ||
2779 | rc = wait_for_completion_killable(&ctx->done); | |
2780 | if (rc) { | |
2781 | mutex_lock(&ctx->aio_mutex); | |
2782 | ctx->rc = rc = -EINTR; | |
2783 | total_written = ctx->total_len; | |
2784 | mutex_unlock(&ctx->aio_mutex); | |
2785 | } else { | |
2786 | rc = ctx->rc; | |
2787 | total_written = ctx->total_len; | |
2788 | } | |
2789 | ||
2790 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
2791 | ||
e9d1593d AV |
2792 | if (unlikely(!total_written)) |
2793 | return rc; | |
72432ffc | 2794 | |
e9d1593d | 2795 | iocb->ki_pos += total_written; |
e9d1593d | 2796 | return total_written; |
72432ffc PS |
2797 | } |
2798 | ||
579f9053 | 2799 | static ssize_t |
3dae8750 | 2800 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc | 2801 | { |
579f9053 PS |
2802 | struct file *file = iocb->ki_filp; |
2803 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2804 | struct inode *inode = file->f_mapping->host; | |
2805 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2806 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
5f380c7f | 2807 | ssize_t rc; |
72432ffc | 2808 | |
966681c9 | 2809 | inode_lock(inode); |
579f9053 PS |
2810 | /* |
2811 | * We need to hold the sem to be sure nobody modifies lock list | |
2812 | * with a brlock that prevents writing. | |
2813 | */ | |
2814 | down_read(&cinode->lock_sem); | |
5f380c7f | 2815 | |
3309dd04 AV |
2816 | rc = generic_write_checks(iocb, from); |
2817 | if (rc <= 0) | |
5f380c7f AV |
2818 | goto out; |
2819 | ||
5f380c7f | 2820 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), |
579f9053 | 2821 | server->vals->exclusive_lock_type, NULL, |
5f380c7f | 2822 | CIFS_WRITE_OP)) |
3dae8750 | 2823 | rc = __generic_file_write_iter(iocb, from); |
5f380c7f AV |
2824 | else |
2825 | rc = -EACCES; | |
2826 | out: | |
966681c9 | 2827 | up_read(&cinode->lock_sem); |
5955102c | 2828 | inode_unlock(inode); |
19dfc1f5 | 2829 | |
e2592217 CH |
2830 | if (rc > 0) |
2831 | rc = generic_write_sync(iocb, rc); | |
579f9053 PS |
2832 | return rc; |
2833 | } | |
2834 | ||
2835 | ssize_t | |
3dae8750 | 2836 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
579f9053 | 2837 | { |
496ad9aa | 2838 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
2839 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
2840 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2841 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2842 | iocb->ki_filp->private_data; | |
2843 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 2844 | ssize_t written; |
ca8aa29c | 2845 | |
c11f1df5 SP |
2846 | written = cifs_get_writer(cinode); |
2847 | if (written) | |
2848 | return written; | |
2849 | ||
18cceb6a | 2850 | if (CIFS_CACHE_WRITE(cinode)) { |
88cf75aa PS |
2851 | if (cap_unix(tcon->ses) && |
2852 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
c11f1df5 | 2853 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
3dae8750 | 2854 | written = generic_file_write_iter(iocb, from); |
c11f1df5 SP |
2855 | goto out; |
2856 | } | |
3dae8750 | 2857 | written = cifs_writev(iocb, from); |
c11f1df5 | 2858 | goto out; |
25078105 | 2859 | } |
25078105 | 2860 | /* |
ca8aa29c PS |
2861 | * For non-oplocked files in strict cache mode we need to write the data |
2862 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2863 | * affected pages because it may cause a error with mandatory locks on | |
2864 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 2865 | */ |
3dae8750 | 2866 | written = cifs_user_writev(iocb, from); |
18cceb6a | 2867 | if (written > 0 && CIFS_CACHE_READ(cinode)) { |
88cf75aa PS |
2868 | /* |
2869 | * Windows 7 server can delay breaking level2 oplock if a write | |
2870 | * request comes - break it on the client to prevent reading | |
2871 | * an old data. | |
2872 | */ | |
4f73c7d3 | 2873 | cifs_zap_mapping(inode); |
f96637be JP |
2874 | cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n", |
2875 | inode); | |
18cceb6a | 2876 | cinode->oplock = 0; |
88cf75aa | 2877 | } |
c11f1df5 SP |
2878 | out: |
2879 | cifs_put_writer(cinode); | |
88cf75aa | 2880 | return written; |
72432ffc PS |
2881 | } |
2882 | ||
0471ca3f | 2883 | static struct cifs_readdata * |
f4e49cd2 | 2884 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2885 | { |
2886 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2887 | |
c5fab6f4 JL |
2888 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2889 | GFP_KERNEL); | |
0471ca3f | 2890 | if (rdata != NULL) { |
6993f74a | 2891 | kref_init(&rdata->refcount); |
1c892549 JL |
2892 | INIT_LIST_HEAD(&rdata->list); |
2893 | init_completion(&rdata->done); | |
0471ca3f | 2894 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2895 | } |
f4e49cd2 | 2896 | |
0471ca3f JL |
2897 | return rdata; |
2898 | } | |
2899 | ||
6993f74a JL |
2900 | void |
2901 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2902 | { |
6993f74a JL |
2903 | struct cifs_readdata *rdata = container_of(refcount, |
2904 | struct cifs_readdata, refcount); | |
2905 | ||
2906 | if (rdata->cfile) | |
2907 | cifsFileInfo_put(rdata->cfile); | |
2908 | ||
0471ca3f JL |
2909 | kfree(rdata); |
2910 | } | |
2911 | ||
1c892549 | 2912 | static int |
c5fab6f4 | 2913 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2914 | { |
2915 | int rc = 0; | |
c5fab6f4 | 2916 | struct page *page; |
1c892549 JL |
2917 | unsigned int i; |
2918 | ||
c5fab6f4 | 2919 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2920 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2921 | if (!page) { | |
2922 | rc = -ENOMEM; | |
2923 | break; | |
2924 | } | |
c5fab6f4 | 2925 | rdata->pages[i] = page; |
1c892549 JL |
2926 | } |
2927 | ||
2928 | if (rc) { | |
c5fab6f4 JL |
2929 | for (i = 0; i < nr_pages; i++) { |
2930 | put_page(rdata->pages[i]); | |
2931 | rdata->pages[i] = NULL; | |
1c892549 JL |
2932 | } |
2933 | } | |
2934 | return rc; | |
2935 | } | |
2936 | ||
2937 | static void | |
2938 | cifs_uncached_readdata_release(struct kref *refcount) | |
2939 | { | |
1c892549 JL |
2940 | struct cifs_readdata *rdata = container_of(refcount, |
2941 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2942 | unsigned int i; |
1c892549 | 2943 | |
6685c5e2 | 2944 | kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release); |
c5fab6f4 JL |
2945 | for (i = 0; i < rdata->nr_pages; i++) { |
2946 | put_page(rdata->pages[i]); | |
2947 | rdata->pages[i] = NULL; | |
1c892549 JL |
2948 | } |
2949 | cifs_readdata_release(refcount); | |
2950 | } | |
2951 | ||
1c892549 JL |
2952 | /** |
2953 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2954 | * @rdata: the readdata response with list of pages holding data | |
7f25bba8 | 2955 | * @iter: destination for our data |
1c892549 JL |
2956 | * |
2957 | * This function copies data from a list of pages in a readdata response into | |
2958 | * an array of iovecs. It will first calculate where the data should go | |
2959 | * based on the info in the readdata and then copy the data into that spot. | |
2960 | */ | |
7f25bba8 AV |
2961 | static int |
2962 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) | |
1c892549 | 2963 | { |
34a54d61 | 2964 | size_t remaining = rdata->got_bytes; |
c5fab6f4 | 2965 | unsigned int i; |
1c892549 | 2966 | |
c5fab6f4 | 2967 | for (i = 0; i < rdata->nr_pages; i++) { |
c5fab6f4 | 2968 | struct page *page = rdata->pages[i]; |
e686bd8d | 2969 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
9c25702c PS |
2970 | size_t written; |
2971 | ||
2972 | if (unlikely(iter->type & ITER_PIPE)) { | |
2973 | void *addr = kmap_atomic(page); | |
2974 | ||
2975 | written = copy_to_iter(addr, copy, iter); | |
2976 | kunmap_atomic(addr); | |
2977 | } else | |
2978 | written = copy_page_to_iter(page, 0, copy, iter); | |
7f25bba8 AV |
2979 | remaining -= written; |
2980 | if (written < copy && iov_iter_count(iter) > 0) | |
2981 | break; | |
1c892549 | 2982 | } |
7f25bba8 | 2983 | return remaining ? -EFAULT : 0; |
1c892549 JL |
2984 | } |
2985 | ||
6685c5e2 PS |
2986 | static void collect_uncached_read_data(struct cifs_aio_ctx *ctx); |
2987 | ||
1c892549 JL |
2988 | static void |
2989 | cifs_uncached_readv_complete(struct work_struct *work) | |
2990 | { | |
2991 | struct cifs_readdata *rdata = container_of(work, | |
2992 | struct cifs_readdata, work); | |
1c892549 JL |
2993 | |
2994 | complete(&rdata->done); | |
6685c5e2 PS |
2995 | collect_uncached_read_data(rdata->ctx); |
2996 | /* the below call can possibly free the last ref to aio ctx */ | |
1c892549 JL |
2997 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
2998 | } | |
2999 | ||
3000 | static int | |
d70b9104 PS |
3001 | uncached_fill_pages(struct TCP_Server_Info *server, |
3002 | struct cifs_readdata *rdata, struct iov_iter *iter, | |
3003 | unsigned int len) | |
1c892549 | 3004 | { |
b3160aeb | 3005 | int result = 0; |
c5fab6f4 JL |
3006 | unsigned int i; |
3007 | unsigned int nr_pages = rdata->nr_pages; | |
1c892549 | 3008 | |
b3160aeb | 3009 | rdata->got_bytes = 0; |
8321fec4 | 3010 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
3011 | for (i = 0; i < nr_pages; i++) { |
3012 | struct page *page = rdata->pages[i]; | |
71335664 | 3013 | size_t n; |
c5fab6f4 | 3014 | |
71335664 | 3015 | if (len <= 0) { |
1c892549 | 3016 | /* no need to hold page hostage */ |
c5fab6f4 JL |
3017 | rdata->pages[i] = NULL; |
3018 | rdata->nr_pages--; | |
1c892549 | 3019 | put_page(page); |
8321fec4 | 3020 | continue; |
1c892549 | 3021 | } |
71335664 AV |
3022 | n = len; |
3023 | if (len >= PAGE_SIZE) { | |
3024 | /* enough data to fill the page */ | |
3025 | n = PAGE_SIZE; | |
3026 | len -= n; | |
3027 | } else { | |
3028 | zero_user(page, len, PAGE_SIZE - len); | |
3029 | rdata->tailsz = len; | |
3030 | len = 0; | |
3031 | } | |
d70b9104 PS |
3032 | if (iter) |
3033 | result = copy_page_from_iter(page, 0, n, iter); | |
3034 | else | |
3035 | result = cifs_read_page_from_socket(server, page, n); | |
8321fec4 JL |
3036 | if (result < 0) |
3037 | break; | |
3038 | ||
b3160aeb | 3039 | rdata->got_bytes += result; |
1c892549 JL |
3040 | } |
3041 | ||
b3160aeb PS |
3042 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
3043 | rdata->got_bytes : result; | |
1c892549 JL |
3044 | } |
3045 | ||
d70b9104 PS |
3046 | static int |
3047 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, | |
3048 | struct cifs_readdata *rdata, unsigned int len) | |
3049 | { | |
3050 | return uncached_fill_pages(server, rdata, NULL, len); | |
3051 | } | |
3052 | ||
3053 | static int | |
3054 | cifs_uncached_copy_into_pages(struct TCP_Server_Info *server, | |
3055 | struct cifs_readdata *rdata, | |
3056 | struct iov_iter *iter) | |
3057 | { | |
3058 | return uncached_fill_pages(server, rdata, iter, iter->count); | |
3059 | } | |
3060 | ||
0ada36b2 PS |
3061 | static int |
3062 | cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, | |
6685c5e2 PS |
3063 | struct cifs_sb_info *cifs_sb, struct list_head *rdata_list, |
3064 | struct cifs_aio_ctx *ctx) | |
1da177e4 | 3065 | { |
0ada36b2 | 3066 | struct cifs_readdata *rdata; |
bed9da02 | 3067 | unsigned int npages, rsize, credits; |
0ada36b2 PS |
3068 | size_t cur_len; |
3069 | int rc; | |
1c892549 | 3070 | pid_t pid; |
25f40259 | 3071 | struct TCP_Server_Info *server; |
a70307ee | 3072 | |
25f40259 | 3073 | server = tlink_tcon(open_file->tlink)->ses->server; |
fc9c5966 | 3074 | |
d4ffff1f PS |
3075 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3076 | pid = open_file->pid; | |
3077 | else | |
3078 | pid = current->tgid; | |
3079 | ||
1c892549 | 3080 | do { |
bed9da02 PS |
3081 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
3082 | &rsize, &credits); | |
3083 | if (rc) | |
3084 | break; | |
3085 | ||
3086 | cur_len = min_t(const size_t, len, rsize); | |
1c892549 | 3087 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); |
a70307ee | 3088 | |
1c892549 JL |
3089 | /* allocate a readdata struct */ |
3090 | rdata = cifs_readdata_alloc(npages, | |
3091 | cifs_uncached_readv_complete); | |
3092 | if (!rdata) { | |
bed9da02 | 3093 | add_credits_and_wake_if(server, credits, 0); |
1c892549 | 3094 | rc = -ENOMEM; |
bae9f746 | 3095 | break; |
1da177e4 | 3096 | } |
a70307ee | 3097 | |
c5fab6f4 | 3098 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
3099 | if (rc) |
3100 | goto error; | |
3101 | ||
3102 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 3103 | rdata->nr_pages = npages; |
1c892549 JL |
3104 | rdata->offset = offset; |
3105 | rdata->bytes = cur_len; | |
3106 | rdata->pid = pid; | |
8321fec4 JL |
3107 | rdata->pagesz = PAGE_SIZE; |
3108 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
d70b9104 | 3109 | rdata->copy_into_pages = cifs_uncached_copy_into_pages; |
bed9da02 | 3110 | rdata->credits = credits; |
6685c5e2 PS |
3111 | rdata->ctx = ctx; |
3112 | kref_get(&ctx->refcount); | |
1c892549 | 3113 | |
25f40259 | 3114 | if (!rdata->cfile->invalidHandle || |
1fa839b4 | 3115 | !(rc = cifs_reopen_file(rdata->cfile, true))) |
25f40259 | 3116 | rc = server->ops->async_readv(rdata); |
1c892549 JL |
3117 | error: |
3118 | if (rc) { | |
bed9da02 | 3119 | add_credits_and_wake_if(server, rdata->credits, 0); |
1c892549 JL |
3120 | kref_put(&rdata->refcount, |
3121 | cifs_uncached_readdata_release); | |
25f40259 PS |
3122 | if (rc == -EAGAIN) |
3123 | continue; | |
1c892549 JL |
3124 | break; |
3125 | } | |
3126 | ||
0ada36b2 | 3127 | list_add_tail(&rdata->list, rdata_list); |
1c892549 JL |
3128 | offset += cur_len; |
3129 | len -= cur_len; | |
3130 | } while (len > 0); | |
3131 | ||
0ada36b2 PS |
3132 | return rc; |
3133 | } | |
3134 | ||
6685c5e2 PS |
3135 | static void |
3136 | collect_uncached_read_data(struct cifs_aio_ctx *ctx) | |
0ada36b2 | 3137 | { |
6685c5e2 PS |
3138 | struct cifs_readdata *rdata, *tmp; |
3139 | struct iov_iter *to = &ctx->iter; | |
0ada36b2 PS |
3140 | struct cifs_sb_info *cifs_sb; |
3141 | struct cifs_tcon *tcon; | |
6685c5e2 PS |
3142 | unsigned int i; |
3143 | int rc; | |
0ada36b2 | 3144 | |
6685c5e2 PS |
3145 | tcon = tlink_tcon(ctx->cfile->tlink); |
3146 | cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb); | |
0ada36b2 | 3147 | |
6685c5e2 | 3148 | mutex_lock(&ctx->aio_mutex); |
0ada36b2 | 3149 | |
6685c5e2 PS |
3150 | if (list_empty(&ctx->list)) { |
3151 | mutex_unlock(&ctx->aio_mutex); | |
3152 | return; | |
3153 | } | |
1c892549 | 3154 | |
6685c5e2 | 3155 | rc = ctx->rc; |
1c892549 | 3156 | /* the loop below should proceed in the order of increasing offsets */ |
25f40259 | 3157 | again: |
6685c5e2 | 3158 | list_for_each_entry_safe(rdata, tmp, &ctx->list, list) { |
1c892549 | 3159 | if (!rc) { |
6685c5e2 PS |
3160 | if (!try_wait_for_completion(&rdata->done)) { |
3161 | mutex_unlock(&ctx->aio_mutex); | |
3162 | return; | |
3163 | } | |
3164 | ||
3165 | if (rdata->result == -EAGAIN) { | |
74027f4a | 3166 | /* resend call if it's a retryable error */ |
fb8a3e52 | 3167 | struct list_head tmp_list; |
d913ed17 | 3168 | unsigned int got_bytes = rdata->got_bytes; |
25f40259 | 3169 | |
fb8a3e52 PS |
3170 | list_del_init(&rdata->list); |
3171 | INIT_LIST_HEAD(&tmp_list); | |
25f40259 | 3172 | |
d913ed17 PS |
3173 | /* |
3174 | * Got a part of data and then reconnect has | |
3175 | * happened -- fill the buffer and continue | |
3176 | * reading. | |
3177 | */ | |
3178 | if (got_bytes && got_bytes < rdata->bytes) { | |
3179 | rc = cifs_readdata_to_iov(rdata, to); | |
3180 | if (rc) { | |
3181 | kref_put(&rdata->refcount, | |
3182 | cifs_uncached_readdata_release); | |
3183 | continue; | |
3184 | } | |
74027f4a | 3185 | } |
d913ed17 PS |
3186 | |
3187 | rc = cifs_send_async_read( | |
3188 | rdata->offset + got_bytes, | |
3189 | rdata->bytes - got_bytes, | |
3190 | rdata->cfile, cifs_sb, | |
6685c5e2 | 3191 | &tmp_list, ctx); |
25f40259 | 3192 | |
6685c5e2 | 3193 | list_splice(&tmp_list, &ctx->list); |
25f40259 | 3194 | |
fb8a3e52 PS |
3195 | kref_put(&rdata->refcount, |
3196 | cifs_uncached_readdata_release); | |
3197 | goto again; | |
3198 | } else if (rdata->result) | |
3199 | rc = rdata->result; | |
3200 | else | |
e6a7bcb4 | 3201 | rc = cifs_readdata_to_iov(rdata, to); |
1c892549 | 3202 | |
2e8a05d8 PS |
3203 | /* if there was a short read -- discard anything left */ |
3204 | if (rdata->got_bytes && rdata->got_bytes < rdata->bytes) | |
3205 | rc = -ENODATA; | |
1da177e4 | 3206 | } |
1c892549 JL |
3207 | list_del_init(&rdata->list); |
3208 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 3209 | } |
a70307ee | 3210 | |
6685c5e2 PS |
3211 | for (i = 0; i < ctx->npages; i++) { |
3212 | if (ctx->should_dirty) | |
3213 | set_page_dirty(ctx->bv[i].bv_page); | |
3214 | put_page(ctx->bv[i].bv_page); | |
3215 | } | |
7f25bba8 | 3216 | |
6685c5e2 PS |
3217 | ctx->total_len = ctx->len - iov_iter_count(to); |
3218 | ||
3219 | cifs_stats_bytes_read(tcon, ctx->total_len); | |
1c892549 | 3220 | |
09a4707e PS |
3221 | /* mask nodata case */ |
3222 | if (rc == -ENODATA) | |
3223 | rc = 0; | |
3224 | ||
6685c5e2 PS |
3225 | ctx->rc = (rc == 0) ? ctx->total_len : rc; |
3226 | ||
3227 | mutex_unlock(&ctx->aio_mutex); | |
3228 | ||
3229 | if (ctx->iocb && ctx->iocb->ki_complete) | |
3230 | ctx->iocb->ki_complete(ctx->iocb, ctx->rc, 0); | |
3231 | else | |
3232 | complete(&ctx->done); | |
3233 | } | |
3234 | ||
3235 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) | |
3236 | { | |
3237 | struct file *file = iocb->ki_filp; | |
3238 | ssize_t rc; | |
3239 | size_t len; | |
3240 | ssize_t total_read = 0; | |
3241 | loff_t offset = iocb->ki_pos; | |
3242 | struct cifs_sb_info *cifs_sb; | |
3243 | struct cifs_tcon *tcon; | |
3244 | struct cifsFileInfo *cfile; | |
3245 | struct cifs_aio_ctx *ctx; | |
3246 | ||
3247 | len = iov_iter_count(to); | |
3248 | if (!len) | |
3249 | return 0; | |
3250 | ||
3251 | cifs_sb = CIFS_FILE_SB(file); | |
3252 | cfile = file->private_data; | |
3253 | tcon = tlink_tcon(cfile->tlink); | |
3254 | ||
3255 | if (!tcon->ses->server->ops->async_readv) | |
3256 | return -ENOSYS; | |
3257 | ||
3258 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
3259 | cifs_dbg(FYI, "attempting read on write only file instance\n"); | |
3260 | ||
3261 | ctx = cifs_aio_ctx_alloc(); | |
3262 | if (!ctx) | |
3263 | return -ENOMEM; | |
3264 | ||
3265 | ctx->cfile = cifsFileInfo_get(cfile); | |
3266 | ||
3267 | if (!is_sync_kiocb(iocb)) | |
3268 | ctx->iocb = iocb; | |
3269 | ||
8a7b0d8e | 3270 | if (to->type == ITER_IOVEC) |
6685c5e2 PS |
3271 | ctx->should_dirty = true; |
3272 | ||
3273 | rc = setup_aio_ctx_iter(ctx, to, READ); | |
3274 | if (rc) { | |
3275 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3276 | return rc; | |
3277 | } | |
3278 | ||
3279 | len = ctx->len; | |
3280 | ||
3281 | /* grab a lock here due to read response handlers can access ctx */ | |
3282 | mutex_lock(&ctx->aio_mutex); | |
3283 | ||
3284 | rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx); | |
3285 | ||
3286 | /* if at least one read request send succeeded, then reset rc */ | |
3287 | if (!list_empty(&ctx->list)) | |
3288 | rc = 0; | |
3289 | ||
3290 | mutex_unlock(&ctx->aio_mutex); | |
3291 | ||
3292 | if (rc) { | |
3293 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3294 | return rc; | |
3295 | } | |
3296 | ||
3297 | if (!is_sync_kiocb(iocb)) { | |
3298 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3299 | return -EIOCBQUEUED; | |
3300 | } | |
3301 | ||
3302 | rc = wait_for_completion_killable(&ctx->done); | |
3303 | if (rc) { | |
3304 | mutex_lock(&ctx->aio_mutex); | |
3305 | ctx->rc = rc = -EINTR; | |
3306 | total_read = ctx->total_len; | |
3307 | mutex_unlock(&ctx->aio_mutex); | |
3308 | } else { | |
3309 | rc = ctx->rc; | |
3310 | total_read = ctx->total_len; | |
3311 | } | |
3312 | ||
3313 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3314 | ||
0165e810 | 3315 | if (total_read) { |
e6a7bcb4 | 3316 | iocb->ki_pos += total_read; |
0165e810 AV |
3317 | return total_read; |
3318 | } | |
3319 | return rc; | |
a70307ee PS |
3320 | } |
3321 | ||
579f9053 | 3322 | ssize_t |
e6a7bcb4 | 3323 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
a70307ee | 3324 | { |
496ad9aa | 3325 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
3326 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3327 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
3328 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
3329 | iocb->ki_filp->private_data; | |
3330 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
3331 | int rc = -EACCES; | |
a70307ee PS |
3332 | |
3333 | /* | |
3334 | * In strict cache mode we need to read from the server all the time | |
3335 | * if we don't have level II oplock because the server can delay mtime | |
3336 | * change - so we can't make a decision about inode invalidating. | |
3337 | * And we can also fail with pagereading if there are mandatory locks | |
3338 | * on pages affected by this read but not on the region from pos to | |
3339 | * pos+len-1. | |
3340 | */ | |
18cceb6a | 3341 | if (!CIFS_CACHE_READ(cinode)) |
e6a7bcb4 | 3342 | return cifs_user_readv(iocb, to); |
a70307ee | 3343 | |
579f9053 PS |
3344 | if (cap_unix(tcon->ses) && |
3345 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
3346 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
e6a7bcb4 | 3347 | return generic_file_read_iter(iocb, to); |
579f9053 PS |
3348 | |
3349 | /* | |
3350 | * We need to hold the sem to be sure nobody modifies lock list | |
3351 | * with a brlock that prevents reading. | |
3352 | */ | |
3353 | down_read(&cinode->lock_sem); | |
e6a7bcb4 | 3354 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
579f9053 | 3355 | tcon->ses->server->vals->shared_lock_type, |
081c0414 | 3356 | NULL, CIFS_READ_OP)) |
e6a7bcb4 | 3357 | rc = generic_file_read_iter(iocb, to); |
579f9053 PS |
3358 | up_read(&cinode->lock_sem); |
3359 | return rc; | |
a70307ee | 3360 | } |
1da177e4 | 3361 | |
f9c6e234 PS |
3362 | static ssize_t |
3363 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
3364 | { |
3365 | int rc = -EACCES; | |
3366 | unsigned int bytes_read = 0; | |
3367 | unsigned int total_read; | |
3368 | unsigned int current_read_size; | |
5eba8ab3 | 3369 | unsigned int rsize; |
1da177e4 | 3370 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 3371 | struct cifs_tcon *tcon; |
f9c6e234 | 3372 | struct TCP_Server_Info *server; |
6d5786a3 | 3373 | unsigned int xid; |
f9c6e234 | 3374 | char *cur_offset; |
1da177e4 | 3375 | struct cifsFileInfo *open_file; |
d4ffff1f | 3376 | struct cifs_io_parms io_parms; |
ec637e3f | 3377 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 3378 | __u32 pid; |
1da177e4 | 3379 | |
6d5786a3 | 3380 | xid = get_xid(); |
7119e220 | 3381 | cifs_sb = CIFS_FILE_SB(file); |
1da177e4 | 3382 | |
5eba8ab3 JL |
3383 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
3384 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
3385 | ||
1da177e4 | 3386 | if (file->private_data == NULL) { |
0f3bc09e | 3387 | rc = -EBADF; |
6d5786a3 | 3388 | free_xid(xid); |
0f3bc09e | 3389 | return rc; |
1da177e4 | 3390 | } |
c21dfb69 | 3391 | open_file = file->private_data; |
29e20f9c | 3392 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
3393 | server = tcon->ses->server; |
3394 | ||
3395 | if (!server->ops->sync_read) { | |
3396 | free_xid(xid); | |
3397 | return -ENOSYS; | |
3398 | } | |
1da177e4 | 3399 | |
d4ffff1f PS |
3400 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3401 | pid = open_file->pid; | |
3402 | else | |
3403 | pid = current->tgid; | |
3404 | ||
1da177e4 | 3405 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 3406 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 3407 | |
f9c6e234 PS |
3408 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
3409 | total_read += bytes_read, cur_offset += bytes_read) { | |
e374d90f PS |
3410 | do { |
3411 | current_read_size = min_t(uint, read_size - total_read, | |
3412 | rsize); | |
3413 | /* | |
3414 | * For windows me and 9x we do not want to request more | |
3415 | * than it negotiated since it will refuse the read | |
3416 | * then. | |
3417 | */ | |
3418 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
29e20f9c | 3419 | tcon->ses->server->vals->cap_large_files)) { |
e374d90f PS |
3420 | current_read_size = min_t(uint, |
3421 | current_read_size, CIFSMaxBufSize); | |
3422 | } | |
cdff08e7 | 3423 | if (open_file->invalidHandle) { |
15886177 | 3424 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
3425 | if (rc != 0) |
3426 | break; | |
3427 | } | |
d4ffff1f | 3428 | io_parms.pid = pid; |
29e20f9c | 3429 | io_parms.tcon = tcon; |
f9c6e234 | 3430 | io_parms.offset = *offset; |
d4ffff1f | 3431 | io_parms.length = current_read_size; |
db8b631d | 3432 | rc = server->ops->sync_read(xid, &open_file->fid, &io_parms, |
f9c6e234 PS |
3433 | &bytes_read, &cur_offset, |
3434 | &buf_type); | |
e374d90f PS |
3435 | } while (rc == -EAGAIN); |
3436 | ||
1da177e4 LT |
3437 | if (rc || (bytes_read == 0)) { |
3438 | if (total_read) { | |
3439 | break; | |
3440 | } else { | |
6d5786a3 | 3441 | free_xid(xid); |
1da177e4 LT |
3442 | return rc; |
3443 | } | |
3444 | } else { | |
29e20f9c | 3445 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 3446 | *offset += bytes_read; |
1da177e4 LT |
3447 | } |
3448 | } | |
6d5786a3 | 3449 | free_xid(xid); |
1da177e4 LT |
3450 | return total_read; |
3451 | } | |
3452 | ||
ca83ce3d JL |
3453 | /* |
3454 | * If the page is mmap'ed into a process' page tables, then we need to make | |
3455 | * sure that it doesn't change while being written back. | |
3456 | */ | |
3457 | static int | |
11bac800 | 3458 | cifs_page_mkwrite(struct vm_fault *vmf) |
ca83ce3d JL |
3459 | { |
3460 | struct page *page = vmf->page; | |
3461 | ||
3462 | lock_page(page); | |
3463 | return VM_FAULT_LOCKED; | |
3464 | } | |
3465 | ||
7cbea8dc | 3466 | static const struct vm_operations_struct cifs_file_vm_ops = { |
ca83ce3d | 3467 | .fault = filemap_fault, |
f1820361 | 3468 | .map_pages = filemap_map_pages, |
ca83ce3d JL |
3469 | .page_mkwrite = cifs_page_mkwrite, |
3470 | }; | |
3471 | ||
7a6a19b1 PS |
3472 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3473 | { | |
f44c5827 | 3474 | int xid, rc = 0; |
496ad9aa | 3475 | struct inode *inode = file_inode(file); |
7a6a19b1 | 3476 | |
6d5786a3 | 3477 | xid = get_xid(); |
7a6a19b1 | 3478 | |
f44c5827 | 3479 | if (!CIFS_CACHE_READ(CIFS_I(inode))) |
4f73c7d3 | 3480 | rc = cifs_zap_mapping(inode); |
f44c5827 MW |
3481 | if (!rc) |
3482 | rc = generic_file_mmap(file, vma); | |
3483 | if (!rc) | |
ca83ce3d | 3484 | vma->vm_ops = &cifs_file_vm_ops; |
f44c5827 | 3485 | |
6d5786a3 | 3486 | free_xid(xid); |
7a6a19b1 PS |
3487 | return rc; |
3488 | } | |
3489 | ||
1da177e4 LT |
3490 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3491 | { | |
1da177e4 LT |
3492 | int rc, xid; |
3493 | ||
6d5786a3 | 3494 | xid = get_xid(); |
f44c5827 | 3495 | |
abab095d | 3496 | rc = cifs_revalidate_file(file); |
f44c5827 | 3497 | if (rc) |
f96637be JP |
3498 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
3499 | rc); | |
f44c5827 MW |
3500 | if (!rc) |
3501 | rc = generic_file_mmap(file, vma); | |
3502 | if (!rc) | |
ca83ce3d | 3503 | vma->vm_ops = &cifs_file_vm_ops; |
f44c5827 | 3504 | |
6d5786a3 | 3505 | free_xid(xid); |
1da177e4 LT |
3506 | return rc; |
3507 | } | |
3508 | ||
0471ca3f JL |
3509 | static void |
3510 | cifs_readv_complete(struct work_struct *work) | |
3511 | { | |
b770ddfa | 3512 | unsigned int i, got_bytes; |
0471ca3f JL |
3513 | struct cifs_readdata *rdata = container_of(work, |
3514 | struct cifs_readdata, work); | |
0471ca3f | 3515 | |
b770ddfa | 3516 | got_bytes = rdata->got_bytes; |
c5fab6f4 JL |
3517 | for (i = 0; i < rdata->nr_pages; i++) { |
3518 | struct page *page = rdata->pages[i]; | |
3519 | ||
0471ca3f JL |
3520 | lru_cache_add_file(page); |
3521 | ||
b770ddfa PS |
3522 | if (rdata->result == 0 || |
3523 | (rdata->result == -EAGAIN && got_bytes)) { | |
0471ca3f JL |
3524 | flush_dcache_page(page); |
3525 | SetPageUptodate(page); | |
3526 | } | |
3527 | ||
3528 | unlock_page(page); | |
3529 | ||
b770ddfa PS |
3530 | if (rdata->result == 0 || |
3531 | (rdata->result == -EAGAIN && got_bytes)) | |
0471ca3f JL |
3532 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
3533 | ||
09cbfeaf | 3534 | got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes); |
b770ddfa | 3535 | |
09cbfeaf | 3536 | put_page(page); |
c5fab6f4 | 3537 | rdata->pages[i] = NULL; |
0471ca3f | 3538 | } |
6993f74a | 3539 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3540 | } |
3541 | ||
8d5ce4d2 | 3542 | static int |
d70b9104 PS |
3543 | readpages_fill_pages(struct TCP_Server_Info *server, |
3544 | struct cifs_readdata *rdata, struct iov_iter *iter, | |
3545 | unsigned int len) | |
8d5ce4d2 | 3546 | { |
b3160aeb | 3547 | int result = 0; |
c5fab6f4 | 3548 | unsigned int i; |
8d5ce4d2 JL |
3549 | u64 eof; |
3550 | pgoff_t eof_index; | |
c5fab6f4 | 3551 | unsigned int nr_pages = rdata->nr_pages; |
8d5ce4d2 JL |
3552 | |
3553 | /* determine the eof that the server (probably) has */ | |
3554 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
09cbfeaf | 3555 | eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0; |
f96637be | 3556 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 3557 | |
b3160aeb | 3558 | rdata->got_bytes = 0; |
09cbfeaf | 3559 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
3560 | for (i = 0; i < nr_pages; i++) { |
3561 | struct page *page = rdata->pages[i]; | |
442c9ac9 | 3562 | size_t n = PAGE_SIZE; |
c5fab6f4 | 3563 | |
09cbfeaf | 3564 | if (len >= PAGE_SIZE) { |
09cbfeaf | 3565 | len -= PAGE_SIZE; |
8321fec4 | 3566 | } else if (len > 0) { |
8d5ce4d2 | 3567 | /* enough for partial page, fill and zero the rest */ |
442c9ac9 | 3568 | zero_user(page, len, PAGE_SIZE - len); |
71335664 | 3569 | n = rdata->tailsz = len; |
8321fec4 | 3570 | len = 0; |
8d5ce4d2 JL |
3571 | } else if (page->index > eof_index) { |
3572 | /* | |
3573 | * The VFS will not try to do readahead past the | |
3574 | * i_size, but it's possible that we have outstanding | |
3575 | * writes with gaps in the middle and the i_size hasn't | |
3576 | * caught up yet. Populate those with zeroed out pages | |
3577 | * to prevent the VFS from repeatedly attempting to | |
3578 | * fill them until the writes are flushed. | |
3579 | */ | |
09cbfeaf | 3580 | zero_user(page, 0, PAGE_SIZE); |
8d5ce4d2 JL |
3581 | lru_cache_add_file(page); |
3582 | flush_dcache_page(page); | |
3583 | SetPageUptodate(page); | |
3584 | unlock_page(page); | |
09cbfeaf | 3585 | put_page(page); |
c5fab6f4 JL |
3586 | rdata->pages[i] = NULL; |
3587 | rdata->nr_pages--; | |
8321fec4 | 3588 | continue; |
8d5ce4d2 JL |
3589 | } else { |
3590 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3591 | lru_cache_add_file(page); |
3592 | unlock_page(page); | |
09cbfeaf | 3593 | put_page(page); |
c5fab6f4 JL |
3594 | rdata->pages[i] = NULL; |
3595 | rdata->nr_pages--; | |
8321fec4 | 3596 | continue; |
8d5ce4d2 | 3597 | } |
8321fec4 | 3598 | |
d70b9104 PS |
3599 | if (iter) |
3600 | result = copy_page_from_iter(page, 0, n, iter); | |
3601 | else | |
3602 | result = cifs_read_page_from_socket(server, page, n); | |
8321fec4 JL |
3603 | if (result < 0) |
3604 | break; | |
3605 | ||
b3160aeb | 3606 | rdata->got_bytes += result; |
8d5ce4d2 JL |
3607 | } |
3608 | ||
b3160aeb PS |
3609 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
3610 | rdata->got_bytes : result; | |
8d5ce4d2 JL |
3611 | } |
3612 | ||
d70b9104 PS |
3613 | static int |
3614 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, | |
3615 | struct cifs_readdata *rdata, unsigned int len) | |
3616 | { | |
3617 | return readpages_fill_pages(server, rdata, NULL, len); | |
3618 | } | |
3619 | ||
3620 | static int | |
3621 | cifs_readpages_copy_into_pages(struct TCP_Server_Info *server, | |
3622 | struct cifs_readdata *rdata, | |
3623 | struct iov_iter *iter) | |
3624 | { | |
3625 | return readpages_fill_pages(server, rdata, iter, iter->count); | |
3626 | } | |
3627 | ||
387eb92a PS |
3628 | static int |
3629 | readpages_get_pages(struct address_space *mapping, struct list_head *page_list, | |
3630 | unsigned int rsize, struct list_head *tmplist, | |
3631 | unsigned int *nr_pages, loff_t *offset, unsigned int *bytes) | |
3632 | { | |
3633 | struct page *page, *tpage; | |
3634 | unsigned int expected_index; | |
3635 | int rc; | |
8a5c743e | 3636 | gfp_t gfp = readahead_gfp_mask(mapping); |
387eb92a | 3637 | |
69cebd75 PS |
3638 | INIT_LIST_HEAD(tmplist); |
3639 | ||
387eb92a PS |
3640 | page = list_entry(page_list->prev, struct page, lru); |
3641 | ||
3642 | /* | |
3643 | * Lock the page and put it in the cache. Since no one else | |
3644 | * should have access to this page, we're safe to simply set | |
3645 | * PG_locked without checking it first. | |
3646 | */ | |
48c935ad | 3647 | __SetPageLocked(page); |
387eb92a | 3648 | rc = add_to_page_cache_locked(page, mapping, |
063d99b4 | 3649 | page->index, gfp); |
387eb92a PS |
3650 | |
3651 | /* give up if we can't stick it in the cache */ | |
3652 | if (rc) { | |
48c935ad | 3653 | __ClearPageLocked(page); |
387eb92a PS |
3654 | return rc; |
3655 | } | |
3656 | ||
3657 | /* move first page to the tmplist */ | |
09cbfeaf KS |
3658 | *offset = (loff_t)page->index << PAGE_SHIFT; |
3659 | *bytes = PAGE_SIZE; | |
387eb92a PS |
3660 | *nr_pages = 1; |
3661 | list_move_tail(&page->lru, tmplist); | |
3662 | ||
3663 | /* now try and add more pages onto the request */ | |
3664 | expected_index = page->index + 1; | |
3665 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3666 | /* discontinuity ? */ | |
3667 | if (page->index != expected_index) | |
3668 | break; | |
3669 | ||
3670 | /* would this page push the read over the rsize? */ | |
09cbfeaf | 3671 | if (*bytes + PAGE_SIZE > rsize) |
387eb92a PS |
3672 | break; |
3673 | ||
48c935ad | 3674 | __SetPageLocked(page); |
063d99b4 | 3675 | if (add_to_page_cache_locked(page, mapping, page->index, gfp)) { |
48c935ad | 3676 | __ClearPageLocked(page); |
387eb92a PS |
3677 | break; |
3678 | } | |
3679 | list_move_tail(&page->lru, tmplist); | |
09cbfeaf | 3680 | (*bytes) += PAGE_SIZE; |
387eb92a PS |
3681 | expected_index++; |
3682 | (*nr_pages)++; | |
3683 | } | |
3684 | return rc; | |
8d5ce4d2 JL |
3685 | } |
3686 | ||
1da177e4 LT |
3687 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3688 | struct list_head *page_list, unsigned num_pages) | |
3689 | { | |
690c5e31 JL |
3690 | int rc; |
3691 | struct list_head tmplist; | |
3692 | struct cifsFileInfo *open_file = file->private_data; | |
7119e220 | 3693 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
69cebd75 | 3694 | struct TCP_Server_Info *server; |
690c5e31 | 3695 | pid_t pid; |
1da177e4 | 3696 | |
56698236 SJ |
3697 | /* |
3698 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3699 | * immediately if the cookie is negative | |
54afa990 DH |
3700 | * |
3701 | * After this point, every page in the list might have PG_fscache set, | |
3702 | * so we will need to clean that up off of every page we don't use. | |
56698236 SJ |
3703 | */ |
3704 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3705 | &num_pages); | |
3706 | if (rc == 0) | |
690c5e31 | 3707 | return rc; |
56698236 | 3708 | |
d4ffff1f PS |
3709 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3710 | pid = open_file->pid; | |
3711 | else | |
3712 | pid = current->tgid; | |
3713 | ||
690c5e31 | 3714 | rc = 0; |
69cebd75 | 3715 | server = tlink_tcon(open_file->tlink)->ses->server; |
1da177e4 | 3716 | |
f96637be JP |
3717 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
3718 | __func__, file, mapping, num_pages); | |
690c5e31 JL |
3719 | |
3720 | /* | |
3721 | * Start with the page at end of list and move it to private | |
3722 | * list. Do the same with any following pages until we hit | |
3723 | * the rsize limit, hit an index discontinuity, or run out of | |
3724 | * pages. Issue the async read and then start the loop again | |
3725 | * until the list is empty. | |
3726 | * | |
3727 | * Note that list order is important. The page_list is in | |
3728 | * the order of declining indexes. When we put the pages in | |
3729 | * the rdata->pages, then we want them in increasing order. | |
3730 | */ | |
3731 | while (!list_empty(page_list)) { | |
bed9da02 | 3732 | unsigned int i, nr_pages, bytes, rsize; |
690c5e31 JL |
3733 | loff_t offset; |
3734 | struct page *page, *tpage; | |
3735 | struct cifs_readdata *rdata; | |
bed9da02 | 3736 | unsigned credits; |
1da177e4 | 3737 | |
bed9da02 PS |
3738 | rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize, |
3739 | &rsize, &credits); | |
3740 | if (rc) | |
3741 | break; | |
690c5e31 JL |
3742 | |
3743 | /* | |
69cebd75 PS |
3744 | * Give up immediately if rsize is too small to read an entire |
3745 | * page. The VFS will fall back to readpage. We should never | |
3746 | * reach this point however since we set ra_pages to 0 when the | |
3747 | * rsize is smaller than a cache page. | |
690c5e31 | 3748 | */ |
09cbfeaf | 3749 | if (unlikely(rsize < PAGE_SIZE)) { |
bed9da02 | 3750 | add_credits_and_wake_if(server, credits, 0); |
69cebd75 | 3751 | return 0; |
bed9da02 | 3752 | } |
690c5e31 | 3753 | |
bed9da02 PS |
3754 | rc = readpages_get_pages(mapping, page_list, rsize, &tmplist, |
3755 | &nr_pages, &offset, &bytes); | |
690c5e31 | 3756 | if (rc) { |
bed9da02 | 3757 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3758 | break; |
3759 | } | |
3760 | ||
0471ca3f | 3761 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3762 | if (!rdata) { |
3763 | /* best to give up if we're out of mem */ | |
3764 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3765 | list_del(&page->lru); | |
3766 | lru_cache_add_file(page); | |
3767 | unlock_page(page); | |
09cbfeaf | 3768 | put_page(page); |
690c5e31 JL |
3769 | } |
3770 | rc = -ENOMEM; | |
bed9da02 | 3771 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
3772 | break; |
3773 | } | |
3774 | ||
6993f74a | 3775 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3776 | rdata->mapping = mapping; |
3777 | rdata->offset = offset; | |
3778 | rdata->bytes = bytes; | |
3779 | rdata->pid = pid; | |
09cbfeaf | 3780 | rdata->pagesz = PAGE_SIZE; |
8321fec4 | 3781 | rdata->read_into_pages = cifs_readpages_read_into_pages; |
d70b9104 | 3782 | rdata->copy_into_pages = cifs_readpages_copy_into_pages; |
bed9da02 | 3783 | rdata->credits = credits; |
c5fab6f4 JL |
3784 | |
3785 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3786 | list_del(&page->lru); | |
3787 | rdata->pages[rdata->nr_pages++] = page; | |
3788 | } | |
690c5e31 | 3789 | |
69cebd75 | 3790 | if (!rdata->cfile->invalidHandle || |
1fa839b4 | 3791 | !(rc = cifs_reopen_file(rdata->cfile, true))) |
69cebd75 PS |
3792 | rc = server->ops->async_readv(rdata); |
3793 | if (rc) { | |
bed9da02 | 3794 | add_credits_and_wake_if(server, rdata->credits, 0); |
c5fab6f4 JL |
3795 | for (i = 0; i < rdata->nr_pages; i++) { |
3796 | page = rdata->pages[i]; | |
690c5e31 JL |
3797 | lru_cache_add_file(page); |
3798 | unlock_page(page); | |
09cbfeaf | 3799 | put_page(page); |
1da177e4 | 3800 | } |
1209bbdf | 3801 | /* Fallback to the readpage in error/reconnect cases */ |
6993f74a | 3802 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3803 | break; |
3804 | } | |
6993f74a JL |
3805 | |
3806 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3807 | } |
3808 | ||
54afa990 DH |
3809 | /* Any pages that have been shown to fscache but didn't get added to |
3810 | * the pagecache must be uncached before they get returned to the | |
3811 | * allocator. | |
3812 | */ | |
3813 | cifs_fscache_readpages_cancel(mapping->host, page_list); | |
1da177e4 LT |
3814 | return rc; |
3815 | } | |
3816 | ||
a9e9b7bc SP |
3817 | /* |
3818 | * cifs_readpage_worker must be called with the page pinned | |
3819 | */ | |
1da177e4 LT |
3820 | static int cifs_readpage_worker(struct file *file, struct page *page, |
3821 | loff_t *poffset) | |
3822 | { | |
3823 | char *read_data; | |
3824 | int rc; | |
3825 | ||
56698236 | 3826 | /* Is the page cached? */ |
496ad9aa | 3827 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
3828 | if (rc == 0) |
3829 | goto read_complete; | |
3830 | ||
1da177e4 LT |
3831 | read_data = kmap(page); |
3832 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3833 | |
09cbfeaf | 3834 | rc = cifs_read(file, read_data, PAGE_SIZE, poffset); |
fb8c4b14 | 3835 | |
1da177e4 LT |
3836 | if (rc < 0) |
3837 | goto io_error; | |
3838 | else | |
f96637be | 3839 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 3840 | |
496ad9aa | 3841 | file_inode(file)->i_atime = |
c2050a45 | 3842 | current_time(file_inode(file)); |
fb8c4b14 | 3843 | |
09cbfeaf KS |
3844 | if (PAGE_SIZE > rc) |
3845 | memset(read_data + rc, 0, PAGE_SIZE - rc); | |
1da177e4 LT |
3846 | |
3847 | flush_dcache_page(page); | |
3848 | SetPageUptodate(page); | |
9dc06558 SJ |
3849 | |
3850 | /* send this page to the cache */ | |
496ad9aa | 3851 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 3852 | |
1da177e4 | 3853 | rc = 0; |
fb8c4b14 | 3854 | |
1da177e4 | 3855 | io_error: |
fb8c4b14 | 3856 | kunmap(page); |
466bd31b | 3857 | unlock_page(page); |
56698236 SJ |
3858 | |
3859 | read_complete: | |
1da177e4 LT |
3860 | return rc; |
3861 | } | |
3862 | ||
3863 | static int cifs_readpage(struct file *file, struct page *page) | |
3864 | { | |
09cbfeaf | 3865 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
1da177e4 | 3866 | int rc = -EACCES; |
6d5786a3 | 3867 | unsigned int xid; |
1da177e4 | 3868 | |
6d5786a3 | 3869 | xid = get_xid(); |
1da177e4 LT |
3870 | |
3871 | if (file->private_data == NULL) { | |
0f3bc09e | 3872 | rc = -EBADF; |
6d5786a3 | 3873 | free_xid(xid); |
0f3bc09e | 3874 | return rc; |
1da177e4 LT |
3875 | } |
3876 | ||
f96637be | 3877 | cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n", |
b6b38f70 | 3878 | page, (int)offset, (int)offset); |
1da177e4 LT |
3879 | |
3880 | rc = cifs_readpage_worker(file, page, &offset); | |
3881 | ||
6d5786a3 | 3882 | free_xid(xid); |
1da177e4 LT |
3883 | return rc; |
3884 | } | |
3885 | ||
a403a0a3 SF |
3886 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3887 | { | |
3888 | struct cifsFileInfo *open_file; | |
3afca265 SF |
3889 | struct cifs_tcon *tcon = |
3890 | cifs_sb_master_tcon(CIFS_SB(cifs_inode->vfs_inode.i_sb)); | |
a403a0a3 | 3891 | |
3afca265 | 3892 | spin_lock(&tcon->open_file_lock); |
a403a0a3 | 3893 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3894 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
3afca265 | 3895 | spin_unlock(&tcon->open_file_lock); |
a403a0a3 SF |
3896 | return 1; |
3897 | } | |
3898 | } | |
3afca265 | 3899 | spin_unlock(&tcon->open_file_lock); |
a403a0a3 SF |
3900 | return 0; |
3901 | } | |
3902 | ||
1da177e4 LT |
3903 | /* We do not want to update the file size from server for inodes |
3904 | open for write - to avoid races with writepage extending | |
3905 | the file - in the future we could consider allowing | |
fb8c4b14 | 3906 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3907 | but this is tricky to do without racing with writebehind |
3908 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3909 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3910 | { |
a403a0a3 | 3911 | if (!cifsInode) |
4b18f2a9 | 3912 | return true; |
50c2f753 | 3913 | |
a403a0a3 SF |
3914 | if (is_inode_writable(cifsInode)) { |
3915 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3916 | struct cifs_sb_info *cifs_sb; |
3917 | ||
c32a0b68 | 3918 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3919 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3920 | /* since no page cache to corrupt on directio |
c32a0b68 | 3921 | we can change size safely */ |
4b18f2a9 | 3922 | return true; |
c32a0b68 SF |
3923 | } |
3924 | ||
fb8c4b14 | 3925 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3926 | return true; |
7ba52631 | 3927 | |
4b18f2a9 | 3928 | return false; |
23e7dd7d | 3929 | } else |
4b18f2a9 | 3930 | return true; |
1da177e4 LT |
3931 | } |
3932 | ||
d9414774 NP |
3933 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3934 | loff_t pos, unsigned len, unsigned flags, | |
3935 | struct page **pagep, void **fsdata) | |
1da177e4 | 3936 | { |
466bd31b | 3937 | int oncethru = 0; |
09cbfeaf KS |
3938 | pgoff_t index = pos >> PAGE_SHIFT; |
3939 | loff_t offset = pos & (PAGE_SIZE - 1); | |
a98ee8c1 JL |
3940 | loff_t page_start = pos & PAGE_MASK; |
3941 | loff_t i_size; | |
3942 | struct page *page; | |
3943 | int rc = 0; | |
d9414774 | 3944 | |
f96637be | 3945 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 3946 | |
466bd31b | 3947 | start: |
54566b2c | 3948 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3949 | if (!page) { |
3950 | rc = -ENOMEM; | |
3951 | goto out; | |
3952 | } | |
8a236264 | 3953 | |
a98ee8c1 JL |
3954 | if (PageUptodate(page)) |
3955 | goto out; | |
8a236264 | 3956 | |
a98ee8c1 JL |
3957 | /* |
3958 | * If we write a full page it will be up to date, no need to read from | |
3959 | * the server. If the write is short, we'll end up doing a sync write | |
3960 | * instead. | |
3961 | */ | |
09cbfeaf | 3962 | if (len == PAGE_SIZE) |
a98ee8c1 | 3963 | goto out; |
8a236264 | 3964 | |
a98ee8c1 JL |
3965 | /* |
3966 | * optimize away the read when we have an oplock, and we're not | |
3967 | * expecting to use any of the data we'd be reading in. That | |
3968 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3969 | * and the write will cover all of the existing data. | |
3970 | */ | |
18cceb6a | 3971 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
a98ee8c1 JL |
3972 | i_size = i_size_read(mapping->host); |
3973 | if (page_start >= i_size || | |
3974 | (offset == 0 && (pos + len) >= i_size)) { | |
3975 | zero_user_segments(page, 0, offset, | |
3976 | offset + len, | |
09cbfeaf | 3977 | PAGE_SIZE); |
a98ee8c1 JL |
3978 | /* |
3979 | * PageChecked means that the parts of the page | |
3980 | * to which we're not writing are considered up | |
3981 | * to date. Once the data is copied to the | |
3982 | * page, it can be set uptodate. | |
3983 | */ | |
3984 | SetPageChecked(page); | |
3985 | goto out; | |
3986 | } | |
3987 | } | |
d9414774 | 3988 | |
466bd31b | 3989 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
a98ee8c1 JL |
3990 | /* |
3991 | * might as well read a page, it is fast enough. If we get | |
3992 | * an error, we don't need to return it. cifs_write_end will | |
3993 | * do a sync write instead since PG_uptodate isn't set. | |
3994 | */ | |
3995 | cifs_readpage_worker(file, page, &page_start); | |
09cbfeaf | 3996 | put_page(page); |
466bd31b SP |
3997 | oncethru = 1; |
3998 | goto start; | |
8a236264 SF |
3999 | } else { |
4000 | /* we could try using another file handle if there is one - | |
4001 | but how would we lock it to prevent close of that handle | |
4002 | racing with this read? In any case | |
d9414774 | 4003 | this will be written out by write_end so is fine */ |
1da177e4 | 4004 | } |
a98ee8c1 JL |
4005 | out: |
4006 | *pagep = page; | |
4007 | return rc; | |
1da177e4 LT |
4008 | } |
4009 | ||
85f2d6b4 SJ |
4010 | static int cifs_release_page(struct page *page, gfp_t gfp) |
4011 | { | |
4012 | if (PagePrivate(page)) | |
4013 | return 0; | |
4014 | ||
4015 | return cifs_fscache_release_page(page, gfp); | |
4016 | } | |
4017 | ||
d47992f8 LC |
4018 | static void cifs_invalidate_page(struct page *page, unsigned int offset, |
4019 | unsigned int length) | |
85f2d6b4 SJ |
4020 | { |
4021 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
4022 | ||
09cbfeaf | 4023 | if (offset == 0 && length == PAGE_SIZE) |
85f2d6b4 SJ |
4024 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); |
4025 | } | |
4026 | ||
9ad1506b PS |
4027 | static int cifs_launder_page(struct page *page) |
4028 | { | |
4029 | int rc = 0; | |
4030 | loff_t range_start = page_offset(page); | |
09cbfeaf | 4031 | loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); |
9ad1506b PS |
4032 | struct writeback_control wbc = { |
4033 | .sync_mode = WB_SYNC_ALL, | |
4034 | .nr_to_write = 0, | |
4035 | .range_start = range_start, | |
4036 | .range_end = range_end, | |
4037 | }; | |
4038 | ||
f96637be | 4039 | cifs_dbg(FYI, "Launder page: %p\n", page); |
9ad1506b PS |
4040 | |
4041 | if (clear_page_dirty_for_io(page)) | |
4042 | rc = cifs_writepage_locked(page, &wbc); | |
4043 | ||
4044 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
4045 | return rc; | |
4046 | } | |
4047 | ||
9b646972 | 4048 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
4049 | { |
4050 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
4051 | oplock_break); | |
2b0143b5 | 4052 | struct inode *inode = d_inode(cfile->dentry); |
3bc303c2 | 4053 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 4054 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
c11f1df5 | 4055 | struct TCP_Server_Info *server = tcon->ses->server; |
eb4b756b | 4056 | int rc = 0; |
3bc303c2 | 4057 | |
c11f1df5 | 4058 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
74316201 | 4059 | TASK_UNINTERRUPTIBLE); |
c11f1df5 SP |
4060 | |
4061 | server->ops->downgrade_oplock(server, cinode, | |
4062 | test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags)); | |
4063 | ||
18cceb6a | 4064 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
63b7d3a4 | 4065 | cifs_has_mand_locks(cinode)) { |
f96637be JP |
4066 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
4067 | inode); | |
18cceb6a | 4068 | cinode->oplock = 0; |
63b7d3a4 PS |
4069 | } |
4070 | ||
3bc303c2 | 4071 | if (inode && S_ISREG(inode->i_mode)) { |
18cceb6a | 4072 | if (CIFS_CACHE_READ(cinode)) |
8737c930 | 4073 | break_lease(inode, O_RDONLY); |
d54ff732 | 4074 | else |
8737c930 | 4075 | break_lease(inode, O_WRONLY); |
3bc303c2 | 4076 | rc = filemap_fdatawrite(inode->i_mapping); |
18cceb6a | 4077 | if (!CIFS_CACHE_READ(cinode)) { |
eb4b756b JL |
4078 | rc = filemap_fdatawait(inode->i_mapping); |
4079 | mapping_set_error(inode->i_mapping, rc); | |
4f73c7d3 | 4080 | cifs_zap_mapping(inode); |
3bc303c2 | 4081 | } |
f96637be | 4082 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
3bc303c2 JL |
4083 | } |
4084 | ||
85160e03 PS |
4085 | rc = cifs_push_locks(cfile); |
4086 | if (rc) | |
f96637be | 4087 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 4088 | |
3bc303c2 JL |
4089 | /* |
4090 | * releasing stale oplock after recent reconnect of smb session using | |
4091 | * a now incorrect file handle is not a data integrity issue but do | |
4092 | * not bother sending an oplock release if session to server still is | |
4093 | * disconnected since oplock already released by the server | |
4094 | */ | |
cdff08e7 | 4095 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
4096 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
4097 | cinode); | |
f96637be | 4098 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
3bc303c2 | 4099 | } |
c11f1df5 | 4100 | cifs_done_oplock_break(cinode); |
3bc303c2 JL |
4101 | } |
4102 | ||
dca69288 SF |
4103 | /* |
4104 | * The presence of cifs_direct_io() in the address space ops vector | |
4105 | * allowes open() O_DIRECT flags which would have failed otherwise. | |
4106 | * | |
4107 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests | |
4108 | * so this method should never be called. | |
4109 | * | |
4110 | * Direct IO is not yet supported in the cached mode. | |
4111 | */ | |
4112 | static ssize_t | |
c8b8e32d | 4113 | cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
dca69288 SF |
4114 | { |
4115 | /* | |
4116 | * FIXME | |
4117 | * Eventually need to support direct IO for non forcedirectio mounts | |
4118 | */ | |
4119 | return -EINVAL; | |
4120 | } | |
4121 | ||
4122 | ||
f5e54d6e | 4123 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
4124 | .readpage = cifs_readpage, |
4125 | .readpages = cifs_readpages, | |
4126 | .writepage = cifs_writepage, | |
37c0eb46 | 4127 | .writepages = cifs_writepages, |
d9414774 NP |
4128 | .write_begin = cifs_write_begin, |
4129 | .write_end = cifs_write_end, | |
1da177e4 | 4130 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 | 4131 | .releasepage = cifs_release_page, |
dca69288 | 4132 | .direct_IO = cifs_direct_io, |
85f2d6b4 | 4133 | .invalidatepage = cifs_invalidate_page, |
9ad1506b | 4134 | .launder_page = cifs_launder_page, |
1da177e4 | 4135 | }; |
273d81d6 DK |
4136 | |
4137 | /* | |
4138 | * cifs_readpages requires the server to support a buffer large enough to | |
4139 | * contain the header plus one complete page of data. Otherwise, we need | |
4140 | * to leave cifs_readpages out of the address space operations. | |
4141 | */ | |
f5e54d6e | 4142 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
4143 | .readpage = cifs_readpage, |
4144 | .writepage = cifs_writepage, | |
4145 | .writepages = cifs_writepages, | |
d9414774 NP |
4146 | .write_begin = cifs_write_begin, |
4147 | .write_end = cifs_write_end, | |
273d81d6 | 4148 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
4149 | .releasepage = cifs_release_page, |
4150 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 4151 | .launder_page = cifs_launder_page, |
273d81d6 | 4152 | }; |