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userns,pidns: Verify the userns for new pid namespaces
[cris-mirror.git] / fs / cifs / file.c
blobbc09df6b473ae309a693b1c6accaa5ff9c3b24de
1 /*
2 * fs/cifs/file.c
3 *
4 * vfs operations that deal with files
5 *
6 * Copyright (C) International Business Machines Corp., 2002,2010
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 * Jeremy Allison (jra@samba.org)
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>
25 #include <linux/backing-dev.h>
26 #include <linux/stat.h>
27 #include <linux/fcntl.h>
28 #include <linux/pagemap.h>
29 #include <linux/pagevec.h>
30 #include <linux/writeback.h>
31 #include <linux/task_io_accounting_ops.h>
32 #include <linux/delay.h>
33 #include <linux/mount.h>
34 #include <linux/slab.h>
35 #include <linux/swap.h>
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"
44 #include "fscache.h"
45
46
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
60 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
61 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
62 FILE_READ_DATA);
63 }
64
65 static u32 cifs_posix_convert_flags(unsigned int flags)
66 {
67 u32 posix_flags = 0;
68
69 if ((flags & O_ACCMODE) == O_RDONLY)
70 posix_flags = SMB_O_RDONLY;
71 else if ((flags & O_ACCMODE) == O_WRONLY)
72 posix_flags = SMB_O_WRONLY;
73 else if ((flags & O_ACCMODE) == O_RDWR)
74 posix_flags = SMB_O_RDWR;
75
76 if (flags & O_CREAT) {
77 posix_flags |= SMB_O_CREAT;
78 if (flags & O_EXCL)
79 posix_flags |= SMB_O_EXCL;
80 } else if (flags & O_EXCL)
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);
83
84 if (flags & O_TRUNC)
85 posix_flags |= SMB_O_TRUNC;
86 /* be safe and imply O_SYNC for O_DSYNC */
87 if (flags & O_DSYNC)
88 posix_flags |= SMB_O_SYNC;
89 if (flags & O_DIRECTORY)
90 posix_flags |= SMB_O_DIRECTORY;
91 if (flags & O_NOFOLLOW)
92 posix_flags |= SMB_O_NOFOLLOW;
93 if (flags & O_DIRECT)
94 posix_flags |= SMB_O_DIRECT;
95
96 return posix_flags;
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;
107 else if ((flags & O_TRUNC) == O_TRUNC)
108 return FILE_OVERWRITE;
109 else
110 return FILE_OPEN;
111 }
112
113 int cifs_posix_open(char *full_path, struct inode **pinode,
114 struct super_block *sb, int mode, unsigned int f_flags,
115 __u32 *poplock, __u16 *pnetfid, unsigned int xid)
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;
123 struct cifs_tcon *tcon;
124
125 cifs_dbg(FYI, "posix open %s\n", full_path);
126
127 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
128 if (presp_data == NULL)
129 return -ENOMEM;
130
131 tlink = cifs_sb_tlink(cifs_sb);
132 if (IS_ERR(tlink)) {
133 rc = PTR_ERR(tlink);
134 goto posix_open_ret;
135 }
136
137 tcon = tlink_tcon(tlink);
138 mode &= ~current_umask();
139
140 posix_flags = cifs_posix_convert_flags(f_flags);
141 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
142 poplock, full_path, cifs_sb->local_nls,
143 cifs_remap(cifs_sb));
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
174 static int
175 cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
176 struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
177 struct cifs_fid *fid, unsigned int xid)
178 {
179 int rc;
180 int desired_access;
181 int disposition;
182 int create_options = CREATE_NOT_DIR;
183 FILE_ALL_INFO *buf;
184 struct TCP_Server_Info *server = tcon->ses->server;
185 struct cifs_open_parms oparms;
186
187 if (!server->ops->open)
188 return -ENOSYS;
189
190 desired_access = cifs_convert_flags(f_flags);
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
224 if (backup_cred(cifs_sb))
225 create_options |= CREATE_OPEN_BACKUP_INTENT;
226
227 oparms.tcon = tcon;
228 oparms.cifs_sb = cifs_sb;
229 oparms.desired_access = desired_access;
230 oparms.create_options = create_options;
231 oparms.disposition = disposition;
232 oparms.path = full_path;
233 oparms.fid = fid;
234 oparms.reconnect = false;
235
236 rc = server->ops->open(xid, &oparms, oplock, buf);
237
238 if (rc)
239 goto out;
240
241 if (tcon->unix_ext)
242 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
243 xid);
244 else
245 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
246 xid, fid);
247
248 out:
249 kfree(buf);
250 return rc;
251 }
252
253 static bool
254 cifs_has_mand_locks(struct cifsInodeInfo *cinode)
255 {
256 struct cifs_fid_locks *cur;
257 bool has_locks = false;
258
259 down_read(&cinode->lock_sem);
260 list_for_each_entry(cur, &cinode->llist, llist) {
261 if (!list_empty(&cur->locks)) {
262 has_locks = true;
263 break;
264 }
265 }
266 up_read(&cinode->lock_sem);
267 return has_locks;
268 }
269
270 struct cifsFileInfo *
271 cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
272 struct tcon_link *tlink, __u32 oplock)
273 {
274 struct dentry *dentry = file_dentry(file);
275 struct inode *inode = d_inode(dentry);
276 struct cifsInodeInfo *cinode = CIFS_I(inode);
277 struct cifsFileInfo *cfile;
278 struct cifs_fid_locks *fdlocks;
279 struct cifs_tcon *tcon = tlink_tcon(tlink);
280 struct TCP_Server_Info *server = tcon->ses->server;
281
282 cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
283 if (cfile == NULL)
284 return cfile;
285
286 fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
287 if (!fdlocks) {
288 kfree(cfile);
289 return NULL;
290 }
291
292 INIT_LIST_HEAD(&fdlocks->locks);
293 fdlocks->cfile = cfile;
294 cfile->llist = fdlocks;
295 down_write(&cinode->lock_sem);
296 list_add(&fdlocks->llist, &cinode->llist);
297 up_write(&cinode->lock_sem);
298
299 cfile->count = 1;
300 cfile->pid = current->tgid;
301 cfile->uid = current_fsuid();
302 cfile->dentry = dget(dentry);
303 cfile->f_flags = file->f_flags;
304 cfile->invalidHandle = false;
305 cfile->tlink = cifs_get_tlink(tlink);
306 INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
307 mutex_init(&cfile->fh_mutex);
308 spin_lock_init(&cfile->file_info_lock);
309
310 cifs_sb_active(inode->i_sb);
311
312 /*
313 * If the server returned a read oplock and we have mandatory brlocks,
314 * set oplock level to None.
315 */
316 if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
317 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
318 oplock = 0;
319 }
320
321 spin_lock(&tcon->open_file_lock);
322 if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
323 oplock = fid->pending_open->oplock;
324 list_del(&fid->pending_open->olist);
325
326 fid->purge_cache = false;
327 server->ops->set_fid(cfile, fid, oplock);
328
329 list_add(&cfile->tlist, &tcon->openFileList);
330
331 /* if readable file instance put first in list*/
332 if (file->f_mode & FMODE_READ)
333 list_add(&cfile->flist, &cinode->openFileList);
334 else
335 list_add_tail(&cfile->flist, &cinode->openFileList);
336 spin_unlock(&tcon->open_file_lock);
337
338 if (fid->purge_cache)
339 cifs_zap_mapping(inode);
340
341 file->private_data = cfile;
342 return cfile;
343 }
344
345 struct cifsFileInfo *
346 cifsFileInfo_get(struct cifsFileInfo *cifs_file)
347 {
348 spin_lock(&cifs_file->file_info_lock);
349 cifsFileInfo_get_locked(cifs_file);
350 spin_unlock(&cifs_file->file_info_lock);
351 return cifs_file;
352 }
353
354 /*
355 * Release a reference on the file private data. This may involve closing
356 * the filehandle out on the server. Must be called without holding
357 * tcon->open_file_lock and cifs_file->file_info_lock.
358 */
359 void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
360 {
361 struct inode *inode = d_inode(cifs_file->dentry);
362 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
363 struct TCP_Server_Info *server = tcon->ses->server;
364 struct cifsInodeInfo *cifsi = CIFS_I(inode);
365 struct super_block *sb = inode->i_sb;
366 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
367 struct cifsLockInfo *li, *tmp;
368 struct cifs_fid fid;
369 struct cifs_pending_open open;
370 bool oplock_break_cancelled;
371
372 spin_lock(&tcon->open_file_lock);
373
374 spin_lock(&cifs_file->file_info_lock);
375 if (--cifs_file->count > 0) {
376 spin_unlock(&cifs_file->file_info_lock);
377 spin_unlock(&tcon->open_file_lock);
378 return;
379 }
380 spin_unlock(&cifs_file->file_info_lock);
381
382 if (server->ops->get_lease_key)
383 server->ops->get_lease_key(inode, &fid);
384
385 /* store open in pending opens to make sure we don't miss lease break */
386 cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
387
388 /* remove it from the lists */
389 list_del(&cifs_file->flist);
390 list_del(&cifs_file->tlist);
391
392 if (list_empty(&cifsi->openFileList)) {
393 cifs_dbg(FYI, "closing last open instance for inode %p\n",
394 d_inode(cifs_file->dentry));
395 /*
396 * In strict cache mode we need invalidate mapping on the last
397 * close because it may cause a error when we open this file
398 * again and get at least level II oplock.
399 */
400 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
401 set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags);
402 cifs_set_oplock_level(cifsi, 0);
403 }
404
405 spin_unlock(&tcon->open_file_lock);
406
407 oplock_break_cancelled = cancel_work_sync(&cifs_file->oplock_break);
408
409 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
410 struct TCP_Server_Info *server = tcon->ses->server;
411 unsigned int xid;
412
413 xid = get_xid();
414 if (server->ops->close)
415 server->ops->close(xid, tcon, &cifs_file->fid);
416 _free_xid(xid);
417 }
418
419 if (oplock_break_cancelled)
420 cifs_done_oplock_break(cifsi);
421
422 cifs_del_pending_open(&open);
423
424 /*
425 * Delete any outstanding lock records. We'll lose them when the file
426 * is closed anyway.
427 */
428 down_write(&cifsi->lock_sem);
429 list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
430 list_del(&li->llist);
431 cifs_del_lock_waiters(li);
432 kfree(li);
433 }
434 list_del(&cifs_file->llist->llist);
435 kfree(cifs_file->llist);
436 up_write(&cifsi->lock_sem);
437
438 cifs_put_tlink(cifs_file->tlink);
439 dput(cifs_file->dentry);
440 cifs_sb_deactive(sb);
441 kfree(cifs_file);
442 }
443
444 int cifs_open(struct inode *inode, struct file *file)
445
446 {
447 int rc = -EACCES;
448 unsigned int xid;
449 __u32 oplock;
450 struct cifs_sb_info *cifs_sb;
451 struct TCP_Server_Info *server;
452 struct cifs_tcon *tcon;
453 struct tcon_link *tlink;
454 struct cifsFileInfo *cfile = NULL;
455 char *full_path = NULL;
456 bool posix_open_ok = false;
457 struct cifs_fid fid;
458 struct cifs_pending_open open;
459
460 xid = get_xid();
461
462 cifs_sb = CIFS_SB(inode->i_sb);
463 tlink = cifs_sb_tlink(cifs_sb);
464 if (IS_ERR(tlink)) {
465 free_xid(xid);
466 return PTR_ERR(tlink);
467 }
468 tcon = tlink_tcon(tlink);
469 server = tcon->ses->server;
470
471 full_path = build_path_from_dentry(file_dentry(file));
472 if (full_path == NULL) {
473 rc = -ENOMEM;
474 goto out;
475 }
476
477 cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
478 inode, file->f_flags, full_path);
479
480 if (file->f_flags & O_DIRECT &&
481 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
483 file->f_op = &cifs_file_direct_nobrl_ops;
484 else
485 file->f_op = &cifs_file_direct_ops;
486 }
487
488 if (server->oplocks)
489 oplock = REQ_OPLOCK;
490 else
491 oplock = 0;
492
493 if (!tcon->broken_posix_open && tcon->unix_ext &&
494 cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
495 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
496 /* can not refresh inode info since size could be stale */
497 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
498 cifs_sb->mnt_file_mode /* ignored */,
499 file->f_flags, &oplock, &fid.netfid, xid);
500 if (rc == 0) {
501 cifs_dbg(FYI, "posix open succeeded\n");
502 posix_open_ok = true;
503 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
504 if (tcon->ses->serverNOS)
505 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",
506 tcon->ses->serverName,
507 tcon->ses->serverNOS);
508 tcon->broken_posix_open = true;
509 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
510 (rc != -EOPNOTSUPP)) /* path not found or net err */
511 goto out;
512 /*
513 * Else fallthrough to retry open the old way on network i/o
514 * or DFS errors.
515 */
516 }
517
518 if (server->ops->get_lease_key)
519 server->ops->get_lease_key(inode, &fid);
520
521 cifs_add_pending_open(&fid, tlink, &open);
522
523 if (!posix_open_ok) {
524 if (server->ops->get_lease_key)
525 server->ops->get_lease_key(inode, &fid);
526
527 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
528 file->f_flags, &oplock, &fid, xid);
529 if (rc) {
530 cifs_del_pending_open(&open);
531 goto out;
532 }
533 }
534
535 cfile = cifs_new_fileinfo(&fid, file, tlink, oplock);
536 if (cfile == NULL) {
537 if (server->ops->close)
538 server->ops->close(xid, tcon, &fid);
539 cifs_del_pending_open(&open);
540 rc = -ENOMEM;
541 goto out;
542 }
543
544 cifs_fscache_set_inode_cookie(inode, file);
545
546 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
547 /*
548 * Time to set mode which we can not set earlier due to
549 * problems creating new read-only files.
550 */
551 struct cifs_unix_set_info_args args = {
552 .mode = inode->i_mode,
553 .uid = INVALID_UID, /* no change */
554 .gid = INVALID_GID, /* no change */
555 .ctime = NO_CHANGE_64,
556 .atime = NO_CHANGE_64,
557 .mtime = NO_CHANGE_64,
558 .device = 0,
559 };
560 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
561 cfile->pid);
562 }
563
564 out:
565 kfree(full_path);
566 free_xid(xid);
567 cifs_put_tlink(tlink);
568 return rc;
569 }
570
571 static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
572
573 /*
574 * Try to reacquire byte range locks that were released when session
575 * to server was lost.
576 */
577 static int
578 cifs_relock_file(struct cifsFileInfo *cfile)
579 {
580 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
581 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
582 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
583 int rc = 0;
584
585 down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING);
586 if (cinode->can_cache_brlcks) {
587 /* can cache locks - no need to relock */
588 up_read(&cinode->lock_sem);
589 return rc;
590 }
591
592 if (cap_unix(tcon->ses) &&
593 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
594 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
595 rc = cifs_push_posix_locks(cfile);
596 else
597 rc = tcon->ses->server->ops->push_mand_locks(cfile);
598
599 up_read(&cinode->lock_sem);
600 return rc;
601 }
602
603 static int
604 cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
605 {
606 int rc = -EACCES;
607 unsigned int xid;
608 __u32 oplock;
609 struct cifs_sb_info *cifs_sb;
610 struct cifs_tcon *tcon;
611 struct TCP_Server_Info *server;
612 struct cifsInodeInfo *cinode;
613 struct inode *inode;
614 char *full_path = NULL;
615 int desired_access;
616 int disposition = FILE_OPEN;
617 int create_options = CREATE_NOT_DIR;
618 struct cifs_open_parms oparms;
619
620 xid = get_xid();
621 mutex_lock(&cfile->fh_mutex);
622 if (!cfile->invalidHandle) {
623 mutex_unlock(&cfile->fh_mutex);
624 rc = 0;
625 free_xid(xid);
626 return rc;
627 }
628
629 inode = d_inode(cfile->dentry);
630 cifs_sb = CIFS_SB(inode->i_sb);
631 tcon = tlink_tcon(cfile->tlink);
632 server = tcon->ses->server;
633
634 /*
635 * Can not grab rename sem here because various ops, including those
636 * that already have the rename sem can end up causing writepage to get
637 * called and if the server was down that means we end up here, and we
638 * can never tell if the caller already has the rename_sem.
639 */
640 full_path = build_path_from_dentry(cfile->dentry);
641 if (full_path == NULL) {
642 rc = -ENOMEM;
643 mutex_unlock(&cfile->fh_mutex);
644 free_xid(xid);
645 return rc;
646 }
647
648 cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
649 inode, cfile->f_flags, full_path);
650
651 if (tcon->ses->server->oplocks)
652 oplock = REQ_OPLOCK;
653 else
654 oplock = 0;
655
656 if (tcon->unix_ext && cap_unix(tcon->ses) &&
657 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
658 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
659 /*
660 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
661 * original open. Must mask them off for a reopen.
662 */
663 unsigned int oflags = cfile->f_flags &
664 ~(O_CREAT | O_EXCL | O_TRUNC);
665
666 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
667 cifs_sb->mnt_file_mode /* ignored */,
668 oflags, &oplock, &cfile->fid.netfid, xid);
669 if (rc == 0) {
670 cifs_dbg(FYI, "posix reopen succeeded\n");
671 oparms.reconnect = true;
672 goto reopen_success;
673 }
674 /*
675 * fallthrough to retry open the old way on errors, especially
676 * in the reconnect path it is important to retry hard
677 */
678 }
679
680 desired_access = cifs_convert_flags(cfile->f_flags);
681
682 if (backup_cred(cifs_sb))
683 create_options |= CREATE_OPEN_BACKUP_INTENT;
684
685 if (server->ops->get_lease_key)
686 server->ops->get_lease_key(inode, &cfile->fid);
687
688 oparms.tcon = tcon;
689 oparms.cifs_sb = cifs_sb;
690 oparms.desired_access = desired_access;
691 oparms.create_options = create_options;
692 oparms.disposition = disposition;
693 oparms.path = full_path;
694 oparms.fid = &cfile->fid;
695 oparms.reconnect = true;
696
697 /*
698 * Can not refresh inode by passing in file_info buf to be returned by
699 * ops->open and then calling get_inode_info with returned buf since
700 * file might have write behind data that needs to be flushed and server
701 * version of file size can be stale. If we knew for sure that inode was
702 * not dirty locally we could do this.
703 */
704 rc = server->ops->open(xid, &oparms, &oplock, NULL);
705 if (rc == -ENOENT && oparms.reconnect == false) {
706 /* durable handle timeout is expired - open the file again */
707 rc = server->ops->open(xid, &oparms, &oplock, NULL);
708 /* indicate that we need to relock the file */
709 oparms.reconnect = true;
710 }
711
712 if (rc) {
713 mutex_unlock(&cfile->fh_mutex);
714 cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
715 cifs_dbg(FYI, "oplock: %d\n", oplock);
716 goto reopen_error_exit;
717 }
718
719 reopen_success:
720 cfile->invalidHandle = false;
721 mutex_unlock(&cfile->fh_mutex);
722 cinode = CIFS_I(inode);
723
724 if (can_flush) {
725 rc = filemap_write_and_wait(inode->i_mapping);
726 mapping_set_error(inode->i_mapping, rc);
727
728 if (tcon->unix_ext)
729 rc = cifs_get_inode_info_unix(&inode, full_path,
730 inode->i_sb, xid);
731 else
732 rc = cifs_get_inode_info(&inode, full_path, NULL,
733 inode->i_sb, xid, NULL);
734 }
735 /*
736 * Else we are writing out data to server already and could deadlock if
737 * we tried to flush data, and since we do not know if we have data that
738 * would invalidate the current end of file on the server we can not go
739 * to the server to get the new inode info.
740 */
741
742 /*
743 * If the server returned a read oplock and we have mandatory brlocks,
744 * set oplock level to None.
745 */
746 if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
747 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
748 oplock = 0;
749 }
750
751 server->ops->set_fid(cfile, &cfile->fid, oplock);
752 if (oparms.reconnect)
753 cifs_relock_file(cfile);
754
755 reopen_error_exit:
756 kfree(full_path);
757 free_xid(xid);
758 return rc;
759 }
760
761 int cifs_close(struct inode *inode, struct file *file)
762 {
763 if (file->private_data != NULL) {
764 cifsFileInfo_put(file->private_data);
765 file->private_data = NULL;
766 }
767
768 /* return code from the ->release op is always ignored */
769 return 0;
770 }
771
772 void
773 cifs_reopen_persistent_handles(struct cifs_tcon *tcon)
774 {
775 struct cifsFileInfo *open_file;
776 struct list_head *tmp;
777 struct list_head *tmp1;
778 struct list_head tmp_list;
779
780 if (!tcon->use_persistent || !tcon->need_reopen_files)
781 return;
782
783 tcon->need_reopen_files = false;
784
785 cifs_dbg(FYI, "Reopen persistent handles");
786 INIT_LIST_HEAD(&tmp_list);
787
788 /* list all files open on tree connection, reopen resilient handles */
789 spin_lock(&tcon->open_file_lock);
790 list_for_each(tmp, &tcon->openFileList) {
791 open_file = list_entry(tmp, struct cifsFileInfo, tlist);
792 if (!open_file->invalidHandle)
793 continue;
794 cifsFileInfo_get(open_file);
795 list_add_tail(&open_file->rlist, &tmp_list);
796 }
797 spin_unlock(&tcon->open_file_lock);
798
799 list_for_each_safe(tmp, tmp1, &tmp_list) {
800 open_file = list_entry(tmp, struct cifsFileInfo, rlist);
801 if (cifs_reopen_file(open_file, false /* do not flush */))
802 tcon->need_reopen_files = true;
803 list_del_init(&open_file->rlist);
804 cifsFileInfo_put(open_file);
805 }
806 }
807
808 int cifs_closedir(struct inode *inode, struct file *file)
809 {
810 int rc = 0;
811 unsigned int xid;
812 struct cifsFileInfo *cfile = file->private_data;
813 struct cifs_tcon *tcon;
814 struct TCP_Server_Info *server;
815 char *buf;
816
817 cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode);
818
819 if (cfile == NULL)
820 return rc;
821
822 xid = get_xid();
823 tcon = tlink_tcon(cfile->tlink);
824 server = tcon->ses->server;
825
826 cifs_dbg(FYI, "Freeing private data in close dir\n");
827 spin_lock(&cfile->file_info_lock);
828 if (server->ops->dir_needs_close(cfile)) {
829 cfile->invalidHandle = true;
830 spin_unlock(&cfile->file_info_lock);
831 if (server->ops->close_dir)
832 rc = server->ops->close_dir(xid, tcon, &cfile->fid);
833 else
834 rc = -ENOSYS;
835 cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc);
836 /* not much we can do if it fails anyway, ignore rc */
837 rc = 0;
838 } else
839 spin_unlock(&cfile->file_info_lock);
840
841 buf = cfile->srch_inf.ntwrk_buf_start;
842 if (buf) {
843 cifs_dbg(FYI, "closedir free smb buf in srch struct\n");
844 cfile->srch_inf.ntwrk_buf_start = NULL;
845 if (cfile->srch_inf.smallBuf)
846 cifs_small_buf_release(buf);
847 else
848 cifs_buf_release(buf);
849 }
850
851 cifs_put_tlink(cfile->tlink);
852 kfree(file->private_data);
853 file->private_data = NULL;
854 /* BB can we lock the filestruct while this is going on? */
855 free_xid(xid);
856 return rc;
857 }
858
859 static struct cifsLockInfo *
860 cifs_lock_init(__u64 offset, __u64 length, __u8 type)
861 {
862 struct cifsLockInfo *lock =
863 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
864 if (!lock)
865 return lock;
866 lock->offset = offset;
867 lock->length = length;
868 lock->type = type;
869 lock->pid = current->tgid;
870 INIT_LIST_HEAD(&lock->blist);
871 init_waitqueue_head(&lock->block_q);
872 return lock;
873 }
874
875 void
876 cifs_del_lock_waiters(struct cifsLockInfo *lock)
877 {
878 struct cifsLockInfo *li, *tmp;
879 list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
880 list_del_init(&li->blist);
881 wake_up(&li->block_q);
882 }
883 }
884
885 #define CIFS_LOCK_OP 0
886 #define CIFS_READ_OP 1
887 #define CIFS_WRITE_OP 2
888
889 /* @rw_check : 0 - no op, 1 - read, 2 - write */
890 static bool
891 cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
892 __u64 length, __u8 type, struct cifsFileInfo *cfile,
893 struct cifsLockInfo **conf_lock, int rw_check)
894 {
895 struct cifsLockInfo *li;
896 struct cifsFileInfo *cur_cfile = fdlocks->cfile;
897 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
898
899 list_for_each_entry(li, &fdlocks->locks, llist) {
900 if (offset + length <= li->offset ||
901 offset >= li->offset + li->length)
902 continue;
903 if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
904 server->ops->compare_fids(cfile, cur_cfile)) {
905 /* shared lock prevents write op through the same fid */
906 if (!(li->type & server->vals->shared_lock_type) ||
907 rw_check != CIFS_WRITE_OP)
908 continue;
909 }
910 if ((type & server->vals->shared_lock_type) &&
911 ((server->ops->compare_fids(cfile, cur_cfile) &&
912 current->tgid == li->pid) || type == li->type))
913 continue;
914 if (conf_lock)
915 *conf_lock = li;
916 return true;
917 }
918 return false;
919 }
920
921 bool
922 cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
923 __u8 type, struct cifsLockInfo **conf_lock,
924 int rw_check)
925 {
926 bool rc = false;
927 struct cifs_fid_locks *cur;
928 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
929
930 list_for_each_entry(cur, &cinode->llist, llist) {
931 rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
932 cfile, conf_lock, rw_check);
933 if (rc)
934 break;
935 }
936
937 return rc;
938 }
939
940 /*
941 * Check if there is another lock that prevents us to set the lock (mandatory
942 * style). If such a lock exists, update the flock structure with its
943 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
944 * or leave it the same if we can't. Returns 0 if we don't need to request to
945 * the server or 1 otherwise.
946 */
947 static int
948 cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
949 __u8 type, struct file_lock *flock)
950 {
951 int rc = 0;
952 struct cifsLockInfo *conf_lock;
953 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
954 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
955 bool exist;
956
957 down_read(&cinode->lock_sem);
958
959 exist = cifs_find_lock_conflict(cfile, offset, length, type,
960 &conf_lock, CIFS_LOCK_OP);
961 if (exist) {
962 flock->fl_start = conf_lock->offset;
963 flock->fl_end = conf_lock->offset + conf_lock->length - 1;
964 flock->fl_pid = conf_lock->pid;
965 if (conf_lock->type & server->vals->shared_lock_type)
966 flock->fl_type = F_RDLCK;
967 else
968 flock->fl_type = F_WRLCK;
969 } else if (!cinode->can_cache_brlcks)
970 rc = 1;
971 else
972 flock->fl_type = F_UNLCK;
973
974 up_read(&cinode->lock_sem);
975 return rc;
976 }
977
978 static void
979 cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
980 {
981 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
982 down_write(&cinode->lock_sem);
983 list_add_tail(&lock->llist, &cfile->llist->locks);
984 up_write(&cinode->lock_sem);
985 }
986
987 /*
988 * Set the byte-range lock (mandatory style). Returns:
989 * 1) 0, if we set the lock and don't need to request to the server;
990 * 2) 1, if no locks prevent us but we need to request to the server;
991 * 3) -EACCESS, if there is a lock that prevents us and wait is false.
992 */
993 static int
994 cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
995 bool wait)
996 {
997 struct cifsLockInfo *conf_lock;
998 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
999 bool exist;
1000 int rc = 0;
1001
1002 try_again:
1003 exist = false;
1004 down_write(&cinode->lock_sem);
1005
1006 exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
1007 lock->type, &conf_lock, CIFS_LOCK_OP);
1008 if (!exist && cinode->can_cache_brlcks) {
1009 list_add_tail(&lock->llist, &cfile->llist->locks);
1010 up_write(&cinode->lock_sem);
1011 return rc;
1012 }
1013
1014 if (!exist)
1015 rc = 1;
1016 else if (!wait)
1017 rc = -EACCES;
1018 else {
1019 list_add_tail(&lock->blist, &conf_lock->blist);
1020 up_write(&cinode->lock_sem);
1021 rc = wait_event_interruptible(lock->block_q,
1022 (lock->blist.prev == &lock->blist) &&
1023 (lock->blist.next == &lock->blist));
1024 if (!rc)
1025 goto try_again;
1026 down_write(&cinode->lock_sem);
1027 list_del_init(&lock->blist);
1028 }
1029
1030 up_write(&cinode->lock_sem);
1031 return rc;
1032 }
1033
1034 /*
1035 * Check if there is another lock that prevents us to set the lock (posix
1036 * style). If such a lock exists, update the flock structure with its
1037 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
1038 * or leave it the same if we can't. Returns 0 if we don't need to request to
1039 * the server or 1 otherwise.
1040 */
1041 static int
1042 cifs_posix_lock_test(struct file *file, struct file_lock *flock)
1043 {
1044 int rc = 0;
1045 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
1046 unsigned char saved_type = flock->fl_type;
1047
1048 if ((flock->fl_flags & FL_POSIX) == 0)
1049 return 1;
1050
1051 down_read(&cinode->lock_sem);
1052 posix_test_lock(file, flock);
1053
1054 if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
1055 flock->fl_type = saved_type;
1056 rc = 1;
1057 }
1058
1059 up_read(&cinode->lock_sem);
1060 return rc;
1061 }
1062
1063 /*
1064 * Set the byte-range lock (posix style). Returns:
1065 * 1) 0, if we set the lock and don't need to request to the server;
1066 * 2) 1, if we need to request to the server;
1067 * 3) <0, if the error occurs while setting the lock.
1068 */
1069 static int
1070 cifs_posix_lock_set(struct file *file, struct file_lock *flock)
1071 {
1072 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
1073 int rc = 1;
1074
1075 if ((flock->fl_flags & FL_POSIX) == 0)
1076 return rc;
1077
1078 try_again:
1079 down_write(&cinode->lock_sem);
1080 if (!cinode->can_cache_brlcks) {
1081 up_write(&cinode->lock_sem);
1082 return rc;
1083 }
1084
1085 rc = posix_lock_file(file, flock, NULL);
1086 up_write(&cinode->lock_sem);
1087 if (rc == FILE_LOCK_DEFERRED) {
1088 rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next);
1089 if (!rc)
1090 goto try_again;
1091 posix_unblock_lock(flock);
1092 }
1093 return rc;
1094 }
1095
1096 int
1097 cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
1098 {
1099 unsigned int xid;
1100 int rc = 0, stored_rc;
1101 struct cifsLockInfo *li, *tmp;
1102 struct cifs_tcon *tcon;
1103 unsigned int num, max_num, max_buf;
1104 LOCKING_ANDX_RANGE *buf, *cur;
1105 int types[] = {LOCKING_ANDX_LARGE_FILES,
1106 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1107 int i;
1108
1109 xid = get_xid();
1110 tcon = tlink_tcon(cfile->tlink);
1111
1112 /*
1113 * Accessing maxBuf is racy with cifs_reconnect - need to store value
1114 * and check it for zero before using.
1115 */
1116 max_buf = tcon->ses->server->maxBuf;
1117 if (!max_buf) {
1118 free_xid(xid);
1119 return -EINVAL;
1120 }
1121
1122 max_num = (max_buf - sizeof(struct smb_hdr)) /
1123 sizeof(LOCKING_ANDX_RANGE);
1124 buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1125 if (!buf) {
1126 free_xid(xid);
1127 return -ENOMEM;
1128 }
1129
1130 for (i = 0; i < 2; i++) {
1131 cur = buf;
1132 num = 0;
1133 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1134 if (li->type != types[i])
1135 continue;
1136 cur->Pid = cpu_to_le16(li->pid);
1137 cur->LengthLow = cpu_to_le32((u32)li->length);
1138 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1139 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1140 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1141 if (++num == max_num) {
1142 stored_rc = cifs_lockv(xid, tcon,
1143 cfile->fid.netfid,
1144 (__u8)li->type, 0, num,
1145 buf);
1146 if (stored_rc)
1147 rc = stored_rc;
1148 cur = buf;
1149 num = 0;
1150 } else
1151 cur++;
1152 }
1153
1154 if (num) {
1155 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1156 (__u8)types[i], 0, num, buf);
1157 if (stored_rc)
1158 rc = stored_rc;
1159 }
1160 }
1161
1162 kfree(buf);
1163 free_xid(xid);
1164 return rc;
1165 }
1166
1167 static __u32
1168 hash_lockowner(fl_owner_t owner)
1169 {
1170 return cifs_lock_secret ^ hash32_ptr((const void *)owner);
1171 }
1172
1173 struct lock_to_push {
1174 struct list_head llist;
1175 __u64 offset;
1176 __u64 length;
1177 __u32 pid;
1178 __u16 netfid;
1179 __u8 type;
1180 };
1181
1182 static int
1183 cifs_push_posix_locks(struct cifsFileInfo *cfile)
1184 {
1185 struct inode *inode = d_inode(cfile->dentry);
1186 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1187 struct file_lock *flock;
1188 struct file_lock_context *flctx = inode->i_flctx;
1189 unsigned int count = 0, i;
1190 int rc = 0, xid, type;
1191 struct list_head locks_to_send, *el;
1192 struct lock_to_push *lck, *tmp;
1193 __u64 length;
1194
1195 xid = get_xid();
1196
1197 if (!flctx)
1198 goto out;
1199
1200 spin_lock(&flctx->flc_lock);
1201 list_for_each(el, &flctx->flc_posix) {
1202 count++;
1203 }
1204 spin_unlock(&flctx->flc_lock);
1205
1206 INIT_LIST_HEAD(&locks_to_send);
1207
1208 /*
1209 * Allocating count locks is enough because no FL_POSIX locks can be
1210 * added to the list while we are holding cinode->lock_sem that
1211 * protects locking operations of this inode.
1212 */
1213 for (i = 0; i < count; i++) {
1214 lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
1215 if (!lck) {
1216 rc = -ENOMEM;
1217 goto err_out;
1218 }
1219 list_add_tail(&lck->llist, &locks_to_send);
1220 }
1221
1222 el = locks_to_send.next;
1223 spin_lock(&flctx->flc_lock);
1224 list_for_each_entry(flock, &flctx->flc_posix, fl_list) {
1225 if (el == &locks_to_send) {
1226 /*
1227 * The list ended. We don't have enough allocated
1228 * structures - something is really wrong.
1229 */
1230 cifs_dbg(VFS, "Can't push all brlocks!\n");
1231 break;
1232 }
1233 length = 1 + flock->fl_end - flock->fl_start;
1234 if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
1235 type = CIFS_RDLCK;
1236 else
1237 type = CIFS_WRLCK;
1238 lck = list_entry(el, struct lock_to_push, llist);
1239 lck->pid = hash_lockowner(flock->fl_owner);
1240 lck->netfid = cfile->fid.netfid;
1241 lck->length = length;
1242 lck->type = type;
1243 lck->offset = flock->fl_start;
1244 }
1245 spin_unlock(&flctx->flc_lock);
1246
1247 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1248 int stored_rc;
1249
1250 stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
1251 lck->offset, lck->length, NULL,
1252 lck->type, 0);
1253 if (stored_rc)
1254 rc = stored_rc;
1255 list_del(&lck->llist);
1256 kfree(lck);
1257 }
1258
1259 out:
1260 free_xid(xid);
1261 return rc;
1262 err_out:
1263 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1264 list_del(&lck->llist);
1265 kfree(lck);
1266 }
1267 goto out;
1268 }
1269
1270 static int
1271 cifs_push_locks(struct cifsFileInfo *cfile)
1272 {
1273 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
1274 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1275 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1276 int rc = 0;
1277
1278 /* we are going to update can_cache_brlcks here - need a write access */
1279 down_write(&cinode->lock_sem);
1280 if (!cinode->can_cache_brlcks) {
1281 up_write(&cinode->lock_sem);
1282 return rc;
1283 }
1284
1285 if (cap_unix(tcon->ses) &&
1286 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1287 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1288 rc = cifs_push_posix_locks(cfile);
1289 else
1290 rc = tcon->ses->server->ops->push_mand_locks(cfile);
1291
1292 cinode->can_cache_brlcks = false;
1293 up_write(&cinode->lock_sem);
1294 return rc;
1295 }
1296
1297 static void
1298 cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
1299 bool *wait_flag, struct TCP_Server_Info *server)
1300 {
1301 if (flock->fl_flags & FL_POSIX)
1302 cifs_dbg(FYI, "Posix\n");
1303 if (flock->fl_flags & FL_FLOCK)
1304 cifs_dbg(FYI, "Flock\n");
1305 if (flock->fl_flags & FL_SLEEP) {
1306 cifs_dbg(FYI, "Blocking lock\n");
1307 *wait_flag = true;
1308 }
1309 if (flock->fl_flags & FL_ACCESS)
1310 cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n");
1311 if (flock->fl_flags & FL_LEASE)
1312 cifs_dbg(FYI, "Lease on file - not implemented yet\n");
1313 if (flock->fl_flags &
1314 (~(FL_POSIX | FL_FLOCK | FL_SLEEP |
1315 FL_ACCESS | FL_LEASE | FL_CLOSE)))
1316 cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags);
1317
1318 *type = server->vals->large_lock_type;
1319 if (flock->fl_type == F_WRLCK) {
1320 cifs_dbg(FYI, "F_WRLCK\n");
1321 *type |= server->vals->exclusive_lock_type;
1322 *lock = 1;
1323 } else if (flock->fl_type == F_UNLCK) {
1324 cifs_dbg(FYI, "F_UNLCK\n");
1325 *type |= server->vals->unlock_lock_type;
1326 *unlock = 1;
1327 /* Check if unlock includes more than one lock range */
1328 } else if (flock->fl_type == F_RDLCK) {
1329 cifs_dbg(FYI, "F_RDLCK\n");
1330 *type |= server->vals->shared_lock_type;
1331 *lock = 1;
1332 } else if (flock->fl_type == F_EXLCK) {
1333 cifs_dbg(FYI, "F_EXLCK\n");
1334 *type |= server->vals->exclusive_lock_type;
1335 *lock = 1;
1336 } else if (flock->fl_type == F_SHLCK) {
1337 cifs_dbg(FYI, "F_SHLCK\n");
1338 *type |= server->vals->shared_lock_type;
1339 *lock = 1;
1340 } else
1341 cifs_dbg(FYI, "Unknown type of lock\n");
1342 }
1343
1344 static int
1345 cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
1346 bool wait_flag, bool posix_lck, unsigned int xid)
1347 {
1348 int rc = 0;
1349 __u64 length = 1 + flock->fl_end - flock->fl_start;
1350 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1351 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1352 struct TCP_Server_Info *server = tcon->ses->server;
1353 __u16 netfid = cfile->fid.netfid;
1354
1355 if (posix_lck) {
1356 int posix_lock_type;
1357
1358 rc = cifs_posix_lock_test(file, flock);
1359 if (!rc)
1360 return rc;
1361
1362 if (type & server->vals->shared_lock_type)
1363 posix_lock_type = CIFS_RDLCK;
1364 else
1365 posix_lock_type = CIFS_WRLCK;
1366 rc = CIFSSMBPosixLock(xid, tcon, netfid,
1367 hash_lockowner(flock->fl_owner),
1368 flock->fl_start, length, flock,
1369 posix_lock_type, wait_flag);
1370 return rc;
1371 }
1372
1373 rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
1374 if (!rc)
1375 return rc;
1376
1377 /* BB we could chain these into one lock request BB */
1378 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type,
1379 1, 0, false);
1380 if (rc == 0) {
1381 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1382 type, 0, 1, false);
1383 flock->fl_type = F_UNLCK;
1384 if (rc != 0)
1385 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1386 rc);
1387 return 0;
1388 }
1389
1390 if (type & server->vals->shared_lock_type) {
1391 flock->fl_type = F_WRLCK;
1392 return 0;
1393 }
1394
1395 type &= ~server->vals->exclusive_lock_type;
1396
1397 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1398 type | server->vals->shared_lock_type,
1399 1, 0, false);
1400 if (rc == 0) {
1401 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1402 type | server->vals->shared_lock_type, 0, 1, false);
1403 flock->fl_type = F_RDLCK;
1404 if (rc != 0)
1405 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1406 rc);
1407 } else
1408 flock->fl_type = F_WRLCK;
1409
1410 return 0;
1411 }
1412
1413 void
1414 cifs_move_llist(struct list_head *source, struct list_head *dest)
1415 {
1416 struct list_head *li, *tmp;
1417 list_for_each_safe(li, tmp, source)
1418 list_move(li, dest);
1419 }
1420
1421 void
1422 cifs_free_llist(struct list_head *llist)
1423 {
1424 struct cifsLockInfo *li, *tmp;
1425 list_for_each_entry_safe(li, tmp, llist, llist) {
1426 cifs_del_lock_waiters(li);
1427 list_del(&li->llist);
1428 kfree(li);
1429 }
1430 }
1431
1432 int
1433 cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
1434 unsigned int xid)
1435 {
1436 int rc = 0, stored_rc;
1437 int types[] = {LOCKING_ANDX_LARGE_FILES,
1438 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1439 unsigned int i;
1440 unsigned int max_num, num, max_buf;
1441 LOCKING_ANDX_RANGE *buf, *cur;
1442 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1443 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1444 struct cifsLockInfo *li, *tmp;
1445 __u64 length = 1 + flock->fl_end - flock->fl_start;
1446 struct list_head tmp_llist;
1447
1448 INIT_LIST_HEAD(&tmp_llist);
1449
1450 /*
1451 * Accessing maxBuf is racy with cifs_reconnect - need to store value
1452 * and check it for zero before using.
1453 */
1454 max_buf = tcon->ses->server->maxBuf;
1455 if (!max_buf)
1456 return -EINVAL;
1457
1458 max_num = (max_buf - sizeof(struct smb_hdr)) /
1459 sizeof(LOCKING_ANDX_RANGE);
1460 buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1461 if (!buf)
1462 return -ENOMEM;
1463
1464 down_write(&cinode->lock_sem);
1465 for (i = 0; i < 2; i++) {
1466 cur = buf;
1467 num = 0;
1468 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1469 if (flock->fl_start > li->offset ||
1470 (flock->fl_start + length) <
1471 (li->offset + li->length))
1472 continue;
1473 if (current->tgid != li->pid)
1474 continue;
1475 if (types[i] != li->type)
1476 continue;
1477 if (cinode->can_cache_brlcks) {
1478 /*
1479 * We can cache brlock requests - simply remove
1480 * a lock from the file's list.
1481 */
1482 list_del(&li->llist);
1483 cifs_del_lock_waiters(li);
1484 kfree(li);
1485 continue;
1486 }
1487 cur->Pid = cpu_to_le16(li->pid);
1488 cur->LengthLow = cpu_to_le32((u32)li->length);
1489 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1490 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1491 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1492 /*
1493 * We need to save a lock here to let us add it again to
1494 * the file's list if the unlock range request fails on
1495 * the server.
1496 */
1497 list_move(&li->llist, &tmp_llist);
1498 if (++num == max_num) {
1499 stored_rc = cifs_lockv(xid, tcon,
1500 cfile->fid.netfid,
1501 li->type, num, 0, buf);
1502 if (stored_rc) {
1503 /*
1504 * We failed on the unlock range
1505 * request - add all locks from the tmp
1506 * list to the head of the file's list.
1507 */
1508 cifs_move_llist(&tmp_llist,
1509 &cfile->llist->locks);
1510 rc = stored_rc;
1511 } else
1512 /*
1513 * The unlock range request succeed -
1514 * free the tmp list.
1515 */
1516 cifs_free_llist(&tmp_llist);
1517 cur = buf;
1518 num = 0;
1519 } else
1520 cur++;
1521 }
1522 if (num) {
1523 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1524 types[i], num, 0, buf);
1525 if (stored_rc) {
1526 cifs_move_llist(&tmp_llist,
1527 &cfile->llist->locks);
1528 rc = stored_rc;
1529 } else
1530 cifs_free_llist(&tmp_llist);
1531 }
1532 }
1533
1534 up_write(&cinode->lock_sem);
1535 kfree(buf);
1536 return rc;
1537 }
1538
1539 static int
1540 cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
1541 bool wait_flag, bool posix_lck, int lock, int unlock,
1542 unsigned int xid)
1543 {
1544 int rc = 0;
1545 __u64 length = 1 + flock->fl_end - flock->fl_start;
1546 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1547 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1548 struct TCP_Server_Info *server = tcon->ses->server;
1549 struct inode *inode = d_inode(cfile->dentry);
1550
1551 if (posix_lck) {
1552 int posix_lock_type;
1553
1554 rc = cifs_posix_lock_set(file, flock);
1555 if (!rc || rc < 0)
1556 return rc;
1557
1558 if (type & server->vals->shared_lock_type)
1559 posix_lock_type = CIFS_RDLCK;
1560 else
1561 posix_lock_type = CIFS_WRLCK;
1562
1563 if (unlock == 1)
1564 posix_lock_type = CIFS_UNLCK;
1565
1566 rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
1567 hash_lockowner(flock->fl_owner),
1568 flock->fl_start, length,
1569 NULL, posix_lock_type, wait_flag);
1570 goto out;
1571 }
1572
1573 if (lock) {
1574 struct cifsLockInfo *lock;
1575
1576 lock = cifs_lock_init(flock->fl_start, length, type);
1577 if (!lock)
1578 return -ENOMEM;
1579
1580 rc = cifs_lock_add_if(cfile, lock, wait_flag);
1581 if (rc < 0) {
1582 kfree(lock);
1583 return rc;
1584 }
1585 if (!rc)
1586 goto out;
1587
1588 /*
1589 * Windows 7 server can delay breaking lease from read to None
1590 * if we set a byte-range lock on a file - break it explicitly
1591 * before sending the lock to the server to be sure the next
1592 * read won't conflict with non-overlapted locks due to
1593 * pagereading.
1594 */
1595 if (!CIFS_CACHE_WRITE(CIFS_I(inode)) &&
1596 CIFS_CACHE_READ(CIFS_I(inode))) {
1597 cifs_zap_mapping(inode);
1598 cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n",
1599 inode);
1600 CIFS_I(inode)->oplock = 0;
1601 }
1602
1603 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1604 type, 1, 0, wait_flag);
1605 if (rc) {
1606 kfree(lock);
1607 return rc;
1608 }
1609
1610 cifs_lock_add(cfile, lock);
1611 } else if (unlock)
1612 rc = server->ops->mand_unlock_range(cfile, flock, xid);
1613
1614 out:
1615 if (flock->fl_flags & FL_POSIX && !rc)
1616 rc = locks_lock_file_wait(file, flock);
1617 return rc;
1618 }
1619
1620 int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
1621 {
1622 int rc, xid;
1623 int lock = 0, unlock = 0;
1624 bool wait_flag = false;
1625 bool posix_lck = false;
1626 struct cifs_sb_info *cifs_sb;
1627 struct cifs_tcon *tcon;
1628 struct cifsInodeInfo *cinode;
1629 struct cifsFileInfo *cfile;
1630 __u16 netfid;
1631 __u32 type;
1632
1633 rc = -EACCES;
1634 xid = get_xid();
1635
1636 cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n",
1637 cmd, flock->fl_flags, flock->fl_type,
1638 flock->fl_start, flock->fl_end);
1639
1640 cfile = (struct cifsFileInfo *)file->private_data;
1641 tcon = tlink_tcon(cfile->tlink);
1642
1643 cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
1644 tcon->ses->server);
1645
1646 cifs_sb = CIFS_FILE_SB(file);
1647 netfid = cfile->fid.netfid;
1648 cinode = CIFS_I(file_inode(file));
1649
1650 if (cap_unix(tcon->ses) &&
1651 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1652 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1653 posix_lck = true;
1654 /*
1655 * BB add code here to normalize offset and length to account for
1656 * negative length which we can not accept over the wire.
1657 */
1658 if (IS_GETLK(cmd)) {
1659 rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
1660 free_xid(xid);
1661 return rc;
1662 }
1663
1664 if (!lock && !unlock) {
1665 /*
1666 * if no lock or unlock then nothing to do since we do not
1667 * know what it is
1668 */
1669 free_xid(xid);
1670 return -EOPNOTSUPP;
1671 }
1672
1673 rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
1674 xid);
1675 free_xid(xid);
1676 return rc;
1677 }
1678
1679 /*
1680 * update the file size (if needed) after a write. Should be called with
1681 * the inode->i_lock held
1682 */
1683 void
1684 cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
1685 unsigned int bytes_written)
1686 {
1687 loff_t end_of_write = offset + bytes_written;
1688
1689 if (end_of_write > cifsi->server_eof)
1690 cifsi->server_eof = end_of_write;
1691 }
1692
1693 static ssize_t
1694 cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data,
1695 size_t write_size, loff_t *offset)
1696 {
1697 int rc = 0;
1698 unsigned int bytes_written = 0;
1699 unsigned int total_written;
1700 struct cifs_sb_info *cifs_sb;
1701 struct cifs_tcon *tcon;
1702 struct TCP_Server_Info *server;
1703 unsigned int xid;
1704 struct dentry *dentry = open_file->dentry;
1705 struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry));
1706 struct cifs_io_parms io_parms;
1707
1708 cifs_sb = CIFS_SB(dentry->d_sb);
1709
1710 cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n",
1711 write_size, *offset, dentry);
1712
1713 tcon = tlink_tcon(open_file->tlink);
1714 server = tcon->ses->server;
1715
1716 if (!server->ops->sync_write)
1717 return -ENOSYS;
1718
1719 xid = get_xid();
1720
1721 for (total_written = 0; write_size > total_written;
1722 total_written += bytes_written) {
1723 rc = -EAGAIN;
1724 while (rc == -EAGAIN) {
1725 struct kvec iov[2];
1726 unsigned int len;
1727
1728 if (open_file->invalidHandle) {
1729 /* we could deadlock if we called
1730 filemap_fdatawait from here so tell
1731 reopen_file not to flush data to
1732 server now */
1733 rc = cifs_reopen_file(open_file, false);
1734 if (rc != 0)
1735 break;
1736 }
1737
1738 len = min(server->ops->wp_retry_size(d_inode(dentry)),
1739 (unsigned int)write_size - total_written);
1740 /* iov[0] is reserved for smb header */
1741 iov[1].iov_base = (char *)write_data + total_written;
1742 iov[1].iov_len = len;
1743 io_parms.pid = pid;
1744 io_parms.tcon = tcon;
1745 io_parms.offset = *offset;
1746 io_parms.length = len;
1747 rc = server->ops->sync_write(xid, &open_file->fid,
1748 &io_parms, &bytes_written, iov, 1);
1749 }
1750 if (rc || (bytes_written == 0)) {
1751 if (total_written)
1752 break;
1753 else {
1754 free_xid(xid);
1755 return rc;
1756 }
1757 } else {
1758 spin_lock(&d_inode(dentry)->i_lock);
1759 cifs_update_eof(cifsi, *offset, bytes_written);
1760 spin_unlock(&d_inode(dentry)->i_lock);
1761 *offset += bytes_written;
1762 }
1763 }
1764
1765 cifs_stats_bytes_written(tcon, total_written);
1766
1767 if (total_written > 0) {
1768 spin_lock(&d_inode(dentry)->i_lock);
1769 if (*offset > d_inode(dentry)->i_size)
1770 i_size_write(d_inode(dentry), *offset);
1771 spin_unlock(&d_inode(dentry)->i_lock);
1772 }
1773 mark_inode_dirty_sync(d_inode(dentry));
1774 free_xid(xid);
1775 return total_written;
1776 }
1777
1778 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1779 bool fsuid_only)
1780 {
1781 struct cifsFileInfo *open_file = NULL;
1782 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1783 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1784
1785 /* only filter by fsuid on multiuser mounts */
1786 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1787 fsuid_only = false;
1788
1789 spin_lock(&tcon->open_file_lock);
1790 /* we could simply get the first_list_entry since write-only entries
1791 are always at the end of the list but since the first entry might
1792 have a close pending, we go through the whole list */
1793 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1794 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1795 continue;
1796 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1797 if (!open_file->invalidHandle) {
1798 /* found a good file */
1799 /* lock it so it will not be closed on us */
1800 cifsFileInfo_get(open_file);
1801 spin_unlock(&tcon->open_file_lock);
1802 return open_file;
1803 } /* else might as well continue, and look for
1804 another, or simply have the caller reopen it
1805 again rather than trying to fix this handle */
1806 } else /* write only file */
1807 break; /* write only files are last so must be done */
1808 }
1809 spin_unlock(&tcon->open_file_lock);
1810 return NULL;
1811 }
1812
1813 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1814 bool fsuid_only)
1815 {
1816 struct cifsFileInfo *open_file, *inv_file = NULL;
1817 struct cifs_sb_info *cifs_sb;
1818 struct cifs_tcon *tcon;
1819 bool any_available = false;
1820 int rc;
1821 unsigned int refind = 0;
1822
1823 /* Having a null inode here (because mapping->host was set to zero by
1824 the VFS or MM) should not happen but we had reports of on oops (due to
1825 it being zero) during stress testcases so we need to check for it */
1826
1827 if (cifs_inode == NULL) {
1828 cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
1829 dump_stack();
1830 return NULL;
1831 }
1832
1833 cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1834 tcon = cifs_sb_master_tcon(cifs_sb);
1835
1836 /* only filter by fsuid on multiuser mounts */
1837 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1838 fsuid_only = false;
1839
1840 spin_lock(&tcon->open_file_lock);
1841 refind_writable:
1842 if (refind > MAX_REOPEN_ATT) {
1843 spin_unlock(&tcon->open_file_lock);
1844 return NULL;
1845 }
1846 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1847 if (!any_available && open_file->pid != current->tgid)
1848 continue;
1849 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1850 continue;
1851 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1852 if (!open_file->invalidHandle) {
1853 /* found a good writable file */
1854 cifsFileInfo_get(open_file);
1855 spin_unlock(&tcon->open_file_lock);
1856 return open_file;
1857 } else {
1858 if (!inv_file)
1859 inv_file = open_file;
1860 }
1861 }
1862 }
1863 /* couldn't find useable FH with same pid, try any available */
1864 if (!any_available) {
1865 any_available = true;
1866 goto refind_writable;
1867 }
1868
1869 if (inv_file) {
1870 any_available = false;
1871 cifsFileInfo_get(inv_file);
1872 }
1873
1874 spin_unlock(&tcon->open_file_lock);
1875
1876 if (inv_file) {
1877 rc = cifs_reopen_file(inv_file, false);
1878 if (!rc)
1879 return inv_file;
1880 else {
1881 spin_lock(&tcon->open_file_lock);
1882 list_move_tail(&inv_file->flist,
1883 &cifs_inode->openFileList);
1884 spin_unlock(&tcon->open_file_lock);
1885 cifsFileInfo_put(inv_file);
1886 ++refind;
1887 inv_file = NULL;
1888 spin_lock(&tcon->open_file_lock);
1889 goto refind_writable;
1890 }
1891 }
1892
1893 return NULL;
1894 }
1895
1896 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1897 {
1898 struct address_space *mapping = page->mapping;
1899 loff_t offset = (loff_t)page->index << PAGE_SHIFT;
1900 char *write_data;
1901 int rc = -EFAULT;
1902 int bytes_written = 0;
1903 struct inode *inode;
1904 struct cifsFileInfo *open_file;
1905
1906 if (!mapping || !mapping->host)
1907 return -EFAULT;
1908
1909 inode = page->mapping->host;
1910
1911 offset += (loff_t)from;
1912 write_data = kmap(page);
1913 write_data += from;
1914
1915 if ((to > PAGE_SIZE) || (from > to)) {
1916 kunmap(page);
1917 return -EIO;
1918 }
1919
1920 /* racing with truncate? */
1921 if (offset > mapping->host->i_size) {
1922 kunmap(page);
1923 return 0; /* don't care */
1924 }
1925
1926 /* check to make sure that we are not extending the file */
1927 if (mapping->host->i_size - offset < (loff_t)to)
1928 to = (unsigned)(mapping->host->i_size - offset);
1929
1930 open_file = find_writable_file(CIFS_I(mapping->host), false);
1931 if (open_file) {
1932 bytes_written = cifs_write(open_file, open_file->pid,
1933 write_data, to - from, &offset);
1934 cifsFileInfo_put(open_file);
1935 /* Does mm or vfs already set times? */
1936 inode->i_atime = inode->i_mtime = current_time(inode);
1937 if ((bytes_written > 0) && (offset))
1938 rc = 0;
1939 else if (bytes_written < 0)
1940 rc = bytes_written;
1941 } else {
1942 cifs_dbg(FYI, "No writeable filehandles for inode\n");
1943 rc = -EIO;
1944 }
1945
1946 kunmap(page);
1947 return rc;
1948 }
1949
1950 static struct cifs_writedata *
1951 wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
1952 pgoff_t end, pgoff_t *index,
1953 unsigned int *found_pages)
1954 {
1955 unsigned int nr_pages;
1956 struct page **pages;
1957 struct cifs_writedata *wdata;
1958
1959 wdata = cifs_writedata_alloc((unsigned int)tofind,
1960 cifs_writev_complete);
1961 if (!wdata)
1962 return NULL;
1963
1964 /*
1965 * find_get_pages_tag seems to return a max of 256 on each
1966 * iteration, so we must call it several times in order to
1967 * fill the array or the wsize is effectively limited to
1968 * 256 * PAGE_SIZE.
1969 */
1970 *found_pages = 0;
1971 pages = wdata->pages;
1972 do {
1973 nr_pages = find_get_pages_tag(mapping, index,
1974 PAGECACHE_TAG_DIRTY, tofind,
1975 pages);
1976 *found_pages += nr_pages;
1977 tofind -= nr_pages;
1978 pages += nr_pages;
1979 } while (nr_pages && tofind && *index <= end);
1980
1981 return wdata;
1982 }
1983
1984 static unsigned int
1985 wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages,
1986 struct address_space *mapping,
1987 struct writeback_control *wbc,
1988 pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done)
1989 {
1990 unsigned int nr_pages = 0, i;
1991 struct page *page;
1992
1993 for (i = 0; i < found_pages; i++) {
1994 page = wdata->pages[i];
1995 /*
1996 * At this point we hold neither mapping->tree_lock nor
1997 * lock on the page itself: the page may be truncated or
1998 * invalidated (changing page->mapping to NULL), or even
1999 * swizzled back from swapper_space to tmpfs file
2000 * mapping
2001 */
2002
2003 if (nr_pages == 0)
2004 lock_page(page);
2005 else if (!trylock_page(page))
2006 break;
2007
2008 if (unlikely(page->mapping != mapping)) {
2009 unlock_page(page);
2010 break;
2011 }
2012
2013 if (!wbc->range_cyclic && page->index > end) {
2014 *done = true;
2015 unlock_page(page);
2016 break;
2017 }
2018
2019 if (*next && (page->index != *next)) {
2020 /* Not next consecutive page */
2021 unlock_page(page);
2022 break;
2023 }
2024
2025 if (wbc->sync_mode != WB_SYNC_NONE)
2026 wait_on_page_writeback(page);
2027
2028 if (PageWriteback(page) ||
2029 !clear_page_dirty_for_io(page)) {
2030 unlock_page(page);
2031 break;
2032 }
2033
2034 /*
2035 * This actually clears the dirty bit in the radix tree.
2036 * See cifs_writepage() for more commentary.
2037 */
2038 set_page_writeback(page);
2039 if (page_offset(page) >= i_size_read(mapping->host)) {
2040 *done = true;
2041 unlock_page(page);
2042 end_page_writeback(page);
2043 break;
2044 }
2045
2046 wdata->pages[i] = page;
2047 *next = page->index + 1;
2048 ++nr_pages;
2049 }
2050
2051 /* reset index to refind any pages skipped */
2052 if (nr_pages == 0)
2053 *index = wdata->pages[0]->index + 1;
2054
2055 /* put any pages we aren't going to use */
2056 for (i = nr_pages; i < found_pages; i++) {
2057 put_page(wdata->pages[i]);
2058 wdata->pages[i] = NULL;
2059 }
2060
2061 return nr_pages;
2062 }
2063
2064 static int
2065 wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages,
2066 struct address_space *mapping, struct writeback_control *wbc)
2067 {
2068 int rc = 0;
2069 struct TCP_Server_Info *server;
2070 unsigned int i;
2071
2072 wdata->sync_mode = wbc->sync_mode;
2073 wdata->nr_pages = nr_pages;
2074 wdata->offset = page_offset(wdata->pages[0]);
2075 wdata->pagesz = PAGE_SIZE;
2076 wdata->tailsz = min(i_size_read(mapping->host) -
2077 page_offset(wdata->pages[nr_pages - 1]),
2078 (loff_t)PAGE_SIZE);
2079 wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz;
2080
2081 if (wdata->cfile != NULL)
2082 cifsFileInfo_put(wdata->cfile);
2083 wdata->cfile = find_writable_file(CIFS_I(mapping->host), false);
2084 if (!wdata->cfile) {
2085 cifs_dbg(VFS, "No writable handles for inode\n");
2086 rc = -EBADF;
2087 } else {
2088 wdata->pid = wdata->cfile->pid;
2089 server = tlink_tcon(wdata->cfile->tlink)->ses->server;
2090 rc = server->ops->async_writev(wdata, cifs_writedata_release);
2091 }
2092
2093 for (i = 0; i < nr_pages; ++i)
2094 unlock_page(wdata->pages[i]);
2095
2096 return rc;
2097 }
2098
2099 static int cifs_writepages(struct address_space *mapping,
2100 struct writeback_control *wbc)
2101 {
2102 struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
2103 struct TCP_Server_Info *server;
2104 bool done = false, scanned = false, range_whole = false;
2105 pgoff_t end, index;
2106 struct cifs_writedata *wdata;
2107 int rc = 0;
2108
2109 /*
2110 * If wsize is smaller than the page cache size, default to writing
2111 * one page at a time via cifs_writepage
2112 */
2113 if (cifs_sb->wsize < PAGE_SIZE)
2114 return generic_writepages(mapping, wbc);
2115
2116 if (wbc->range_cyclic) {
2117 index = mapping->writeback_index; /* Start from prev offset */
2118 end = -1;
2119 } else {
2120 index = wbc->range_start >> PAGE_SHIFT;
2121 end = wbc->range_end >> PAGE_SHIFT;
2122 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
2123 range_whole = true;
2124 scanned = true;
2125 }
2126 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
2127 retry:
2128 while (!done && index <= end) {
2129 unsigned int i, nr_pages, found_pages, wsize, credits;
2130 pgoff_t next = 0, tofind, saved_index = index;
2131
2132 rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
2133 &wsize, &credits);
2134 if (rc)
2135 break;
2136
2137 tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1;
2138
2139 wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index,
2140 &found_pages);
2141 if (!wdata) {
2142 rc = -ENOMEM;
2143 add_credits_and_wake_if(server, credits, 0);
2144 break;
2145 }
2146
2147 if (found_pages == 0) {
2148 kref_put(&wdata->refcount, cifs_writedata_release);
2149 add_credits_and_wake_if(server, credits, 0);
2150 break;
2151 }
2152
2153 nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc,
2154 end, &index, &next, &done);
2155
2156 /* nothing to write? */
2157 if (nr_pages == 0) {
2158 kref_put(&wdata->refcount, cifs_writedata_release);
2159 add_credits_and_wake_if(server, credits, 0);
2160 continue;
2161 }
2162
2163 wdata->credits = credits;
2164
2165 rc = wdata_send_pages(wdata, nr_pages, mapping, wbc);
2166
2167 /* send failure -- clean up the mess */
2168 if (rc != 0) {
2169 add_credits_and_wake_if(server, wdata->credits, 0);
2170 for (i = 0; i < nr_pages; ++i) {
2171 if (rc == -EAGAIN)
2172 redirty_page_for_writepage(wbc,
2173 wdata->pages[i]);
2174 else
2175 SetPageError(wdata->pages[i]);
2176 end_page_writeback(wdata->pages[i]);
2177 put_page(wdata->pages[i]);
2178 }
2179 if (rc != -EAGAIN)
2180 mapping_set_error(mapping, rc);
2181 }
2182 kref_put(&wdata->refcount, cifs_writedata_release);
2183
2184 if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) {
2185 index = saved_index;
2186 continue;
2187 }
2188
2189 wbc->nr_to_write -= nr_pages;
2190 if (wbc->nr_to_write <= 0)
2191 done = true;
2192
2193 index = next;
2194 }
2195
2196 if (!scanned && !done) {
2197 /*
2198 * We hit the last page and there is more work to be done: wrap
2199 * back to the start of the file
2200 */
2201 scanned = true;
2202 index = 0;
2203 goto retry;
2204 }
2205
2206 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2207 mapping->writeback_index = index;
2208
2209 return rc;
2210 }
2211
2212 static int
2213 cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
2214 {
2215 int rc;
2216 unsigned int xid;
2217
2218 xid = get_xid();
2219 /* BB add check for wbc flags */
2220 get_page(page);
2221 if (!PageUptodate(page))
2222 cifs_dbg(FYI, "ppw - page not up to date\n");
2223
2224 /*
2225 * Set the "writeback" flag, and clear "dirty" in the radix tree.
2226 *
2227 * A writepage() implementation always needs to do either this,
2228 * or re-dirty the page with "redirty_page_for_writepage()" in
2229 * the case of a failure.
2230 *
2231 * Just unlocking the page will cause the radix tree tag-bits
2232 * to fail to update with the state of the page correctly.
2233 */
2234 set_page_writeback(page);
2235 retry_write:
2236 rc = cifs_partialpagewrite(page, 0, PAGE_SIZE);
2237 if (rc == -EAGAIN) {
2238 if (wbc->sync_mode == WB_SYNC_ALL)
2239 goto retry_write;
2240 redirty_page_for_writepage(wbc, page);
2241 } else if (rc != 0) {
2242 SetPageError(page);
2243 mapping_set_error(page->mapping, rc);
2244 } else {
2245 SetPageUptodate(page);
2246 }
2247 end_page_writeback(page);
2248 put_page(page);
2249 free_xid(xid);
2250 return rc;
2251 }
2252
2253 static int cifs_writepage(struct page *page, struct writeback_control *wbc)
2254 {
2255 int rc = cifs_writepage_locked(page, wbc);
2256 unlock_page(page);
2257 return rc;
2258 }
2259
2260 static int cifs_write_end(struct file *file, struct address_space *mapping,
2261 loff_t pos, unsigned len, unsigned copied,
2262 struct page *page, void *fsdata)
2263 {
2264 int rc;
2265 struct inode *inode = mapping->host;
2266 struct cifsFileInfo *cfile = file->private_data;
2267 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
2268 __u32 pid;
2269
2270 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2271 pid = cfile->pid;
2272 else
2273 pid = current->tgid;
2274
2275 cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
2276 page, pos, copied);
2277
2278 if (PageChecked(page)) {
2279 if (copied == len)
2280 SetPageUptodate(page);
2281 ClearPageChecked(page);
2282 } else if (!PageUptodate(page) && copied == PAGE_SIZE)
2283 SetPageUptodate(page);
2284
2285 if (!PageUptodate(page)) {
2286 char *page_data;
2287 unsigned offset = pos & (PAGE_SIZE - 1);
2288 unsigned int xid;
2289
2290 xid = get_xid();
2291 /* this is probably better than directly calling
2292 partialpage_write since in this function the file handle is
2293 known which we might as well leverage */
2294 /* BB check if anything else missing out of ppw
2295 such as updating last write time */
2296 page_data = kmap(page);
2297 rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
2298 /* if (rc < 0) should we set writebehind rc? */
2299 kunmap(page);
2300
2301 free_xid(xid);
2302 } else {
2303 rc = copied;
2304 pos += copied;
2305 set_page_dirty(page);
2306 }
2307
2308 if (rc > 0) {
2309 spin_lock(&inode->i_lock);
2310 if (pos > inode->i_size)
2311 i_size_write(inode, pos);
2312 spin_unlock(&inode->i_lock);
2313 }
2314
2315 unlock_page(page);
2316 put_page(page);
2317
2318 return rc;
2319 }
2320
2321 int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
2322 int datasync)
2323 {
2324 unsigned int xid;
2325 int rc = 0;
2326 struct cifs_tcon *tcon;
2327 struct TCP_Server_Info *server;
2328 struct cifsFileInfo *smbfile = file->private_data;
2329 struct inode *inode = file_inode(file);
2330 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2331
2332 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2333 if (rc)
2334 return rc;
2335 inode_lock(inode);
2336
2337 xid = get_xid();
2338
2339 cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
2340 file, datasync);
2341
2342 if (!CIFS_CACHE_READ(CIFS_I(inode))) {
2343 rc = cifs_zap_mapping(inode);
2344 if (rc) {
2345 cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc);
2346 rc = 0; /* don't care about it in fsync */
2347 }
2348 }
2349
2350 tcon = tlink_tcon(smbfile->tlink);
2351 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2352 server = tcon->ses->server;
2353 if (server->ops->flush)
2354 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2355 else
2356 rc = -ENOSYS;
2357 }
2358
2359 free_xid(xid);
2360 inode_unlock(inode);
2361 return rc;
2362 }
2363
2364 int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2365 {
2366 unsigned int xid;
2367 int rc = 0;
2368 struct cifs_tcon *tcon;
2369 struct TCP_Server_Info *server;
2370 struct cifsFileInfo *smbfile = file->private_data;
2371 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
2372 struct inode *inode = file->f_mapping->host;
2373
2374 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2375 if (rc)
2376 return rc;
2377 inode_lock(inode);
2378
2379 xid = get_xid();
2380
2381 cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
2382 file, datasync);
2383
2384 tcon = tlink_tcon(smbfile->tlink);
2385 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2386 server = tcon->ses->server;
2387 if (server->ops->flush)
2388 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2389 else
2390 rc = -ENOSYS;
2391 }
2392
2393 free_xid(xid);
2394 inode_unlock(inode);
2395 return rc;
2396 }
2397
2398 /*
2399 * As file closes, flush all cached write data for this inode checking
2400 * for write behind errors.
2401 */
2402 int cifs_flush(struct file *file, fl_owner_t id)
2403 {
2404 struct inode *inode = file_inode(file);
2405 int rc = 0;
2406
2407 if (file->f_mode & FMODE_WRITE)
2408 rc = filemap_write_and_wait(inode->i_mapping);
2409
2410 cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc);
2411
2412 return rc;
2413 }
2414
2415 static int
2416 cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
2417 {
2418 int rc = 0;
2419 unsigned long i;
2420
2421 for (i = 0; i < num_pages; i++) {
2422 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2423 if (!pages[i]) {
2424 /*
2425 * save number of pages we have already allocated and
2426 * return with ENOMEM error
2427 */
2428 num_pages = i;
2429 rc = -ENOMEM;
2430 break;
2431 }
2432 }
2433
2434 if (rc) {
2435 for (i = 0; i < num_pages; i++)
2436 put_page(pages[i]);
2437 }
2438 return rc;
2439 }
2440
2441 static inline
2442 size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
2443 {
2444 size_t num_pages;
2445 size_t clen;
2446
2447 clen = min_t(const size_t, len, wsize);
2448 num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
2449
2450 if (cur_len)
2451 *cur_len = clen;
2452
2453 return num_pages;
2454 }
2455
2456 static void
2457 cifs_uncached_writedata_release(struct kref *refcount)
2458 {
2459 int i;
2460 struct cifs_writedata *wdata = container_of(refcount,
2461 struct cifs_writedata, refcount);
2462
2463 kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release);
2464 for (i = 0; i < wdata->nr_pages; i++)
2465 put_page(wdata->pages[i]);
2466 cifs_writedata_release(refcount);
2467 }
2468
2469 static void collect_uncached_write_data(struct cifs_aio_ctx *ctx);
2470
2471 static void
2472 cifs_uncached_writev_complete(struct work_struct *work)
2473 {
2474 struct cifs_writedata *wdata = container_of(work,
2475 struct cifs_writedata, work);
2476 struct inode *inode = d_inode(wdata->cfile->dentry);
2477 struct cifsInodeInfo *cifsi = CIFS_I(inode);
2478
2479 spin_lock(&inode->i_lock);
2480 cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
2481 if (cifsi->server_eof > inode->i_size)
2482 i_size_write(inode, cifsi->server_eof);
2483 spin_unlock(&inode->i_lock);
2484
2485 complete(&wdata->done);
2486 collect_uncached_write_data(wdata->ctx);
2487 /* the below call can possibly free the last ref to aio ctx */
2488 kref_put(&wdata->refcount, cifs_uncached_writedata_release);
2489 }
2490
2491 static int
2492 wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from,
2493 size_t *len, unsigned long *num_pages)
2494 {
2495 size_t save_len, copied, bytes, cur_len = *len;
2496 unsigned long i, nr_pages = *num_pages;
2497
2498 save_len = cur_len;
2499 for (i = 0; i < nr_pages; i++) {
2500 bytes = min_t(const size_t, cur_len, PAGE_SIZE);
2501 copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from);
2502 cur_len -= copied;
2503 /*
2504 * If we didn't copy as much as we expected, then that
2505 * may mean we trod into an unmapped area. Stop copying
2506 * at that point. On the next pass through the big
2507 * loop, we'll likely end up getting a zero-length
2508 * write and bailing out of it.
2509 */
2510 if (copied < bytes)
2511 break;
2512 }
2513 cur_len = save_len - cur_len;
2514 *len = cur_len;
2515
2516 /*
2517 * If we have no data to send, then that probably means that
2518 * the copy above failed altogether. That's most likely because
2519 * the address in the iovec was bogus. Return -EFAULT and let
2520 * the caller free anything we allocated and bail out.
2521 */
2522 if (!cur_len)
2523 return -EFAULT;
2524
2525 /*
2526 * i + 1 now represents the number of pages we actually used in
2527 * the copy phase above.
2528 */
2529 *num_pages = i + 1;
2530 return 0;
2531 }
2532
2533 static int
2534 cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
2535 struct cifsFileInfo *open_file,
2536 struct cifs_sb_info *cifs_sb, struct list_head *wdata_list,
2537 struct cifs_aio_ctx *ctx)
2538 {
2539 int rc = 0;
2540 size_t cur_len;
2541 unsigned long nr_pages, num_pages, i;
2542 struct cifs_writedata *wdata;
2543 struct iov_iter saved_from = *from;
2544 loff_t saved_offset = offset;
2545 pid_t pid;
2546 struct TCP_Server_Info *server;
2547
2548 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2549 pid = open_file->pid;
2550 else
2551 pid = current->tgid;
2552
2553 server = tlink_tcon(open_file->tlink)->ses->server;
2554
2555 do {
2556 unsigned int wsize, credits;
2557
2558 rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
2559 &wsize, &credits);
2560 if (rc)
2561 break;
2562
2563 nr_pages = get_numpages(wsize, len, &cur_len);
2564 wdata = cifs_writedata_alloc(nr_pages,
2565 cifs_uncached_writev_complete);
2566 if (!wdata) {
2567 rc = -ENOMEM;
2568 add_credits_and_wake_if(server, credits, 0);
2569 break;
2570 }
2571
2572 rc = cifs_write_allocate_pages(wdata->pages, nr_pages);
2573 if (rc) {
2574 kfree(wdata);
2575 add_credits_and_wake_if(server, credits, 0);
2576 break;
2577 }
2578
2579 num_pages = nr_pages;
2580 rc = wdata_fill_from_iovec(wdata, from, &cur_len, &num_pages);
2581 if (rc) {
2582 for (i = 0; i < nr_pages; i++)
2583 put_page(wdata->pages[i]);
2584 kfree(wdata);
2585 add_credits_and_wake_if(server, credits, 0);
2586 break;
2587 }
2588
2589 /*
2590 * Bring nr_pages down to the number of pages we actually used,
2591 * and free any pages that we didn't use.
2592 */
2593 for ( ; nr_pages > num_pages; nr_pages--)
2594 put_page(wdata->pages[nr_pages - 1]);
2595
2596 wdata->sync_mode = WB_SYNC_ALL;
2597 wdata->nr_pages = nr_pages;
2598 wdata->offset = (__u64)offset;
2599 wdata->cfile = cifsFileInfo_get(open_file);
2600 wdata->pid = pid;
2601 wdata->bytes = cur_len;
2602 wdata->pagesz = PAGE_SIZE;
2603 wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE);
2604 wdata->credits = credits;
2605 wdata->ctx = ctx;
2606 kref_get(&ctx->refcount);
2607
2608 if (!wdata->cfile->invalidHandle ||
2609 !(rc = cifs_reopen_file(wdata->cfile, false)))
2610 rc = server->ops->async_writev(wdata,
2611 cifs_uncached_writedata_release);
2612 if (rc) {
2613 add_credits_and_wake_if(server, wdata->credits, 0);
2614 kref_put(&wdata->refcount,
2615 cifs_uncached_writedata_release);
2616 if (rc == -EAGAIN) {
2617 *from = saved_from;
2618 iov_iter_advance(from, offset - saved_offset);
2619 continue;
2620 }
2621 break;
2622 }
2623
2624 list_add_tail(&wdata->list, wdata_list);
2625 offset += cur_len;
2626 len -= cur_len;
2627 } while (len > 0);
2628
2629 return rc;
2630 }
2631
2632 static void collect_uncached_write_data(struct cifs_aio_ctx *ctx)
2633 {
2634 struct cifs_writedata *wdata, *tmp;
2635 struct cifs_tcon *tcon;
2636 struct cifs_sb_info *cifs_sb;
2637 struct dentry *dentry = ctx->cfile->dentry;
2638 unsigned int i;
2639 int rc;
2640
2641 tcon = tlink_tcon(ctx->cfile->tlink);
2642 cifs_sb = CIFS_SB(dentry->d_sb);
2643
2644 mutex_lock(&ctx->aio_mutex);
2645
2646 if (list_empty(&ctx->list)) {
2647 mutex_unlock(&ctx->aio_mutex);
2648 return;
2649 }
2650
2651 rc = ctx->rc;
2652 /*
2653 * Wait for and collect replies for any successful sends in order of
2654 * increasing offset. Once an error is hit, then return without waiting
2655 * for any more replies.
2656 */
2657 restart_loop:
2658 list_for_each_entry_safe(wdata, tmp, &ctx->list, list) {
2659 if (!rc) {
2660 if (!try_wait_for_completion(&wdata->done)) {
2661 mutex_unlock(&ctx->aio_mutex);
2662 return;
2663 }
2664
2665 if (wdata->result)
2666 rc = wdata->result;
2667 else
2668 ctx->total_len += wdata->bytes;
2669
2670 /* resend call if it's a retryable error */
2671 if (rc == -EAGAIN) {
2672 struct list_head tmp_list;
2673 struct iov_iter tmp_from = ctx->iter;
2674
2675 INIT_LIST_HEAD(&tmp_list);
2676 list_del_init(&wdata->list);
2677
2678 iov_iter_advance(&tmp_from,
2679 wdata->offset - ctx->pos);
2680
2681 rc = cifs_write_from_iter(wdata->offset,
2682 wdata->bytes, &tmp_from,
2683 ctx->cfile, cifs_sb, &tmp_list,
2684 ctx);
2685
2686 list_splice(&tmp_list, &ctx->list);
2687
2688 kref_put(&wdata->refcount,
2689 cifs_uncached_writedata_release);
2690 goto restart_loop;
2691 }
2692 }
2693 list_del_init(&wdata->list);
2694 kref_put(&wdata->refcount, cifs_uncached_writedata_release);
2695 }
2696
2697 for (i = 0; i < ctx->npages; i++)
2698 put_page(ctx->bv[i].bv_page);
2699
2700 cifs_stats_bytes_written(tcon, ctx->total_len);
2701 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags);
2702
2703 ctx->rc = (rc == 0) ? ctx->total_len : rc;
2704
2705 mutex_unlock(&ctx->aio_mutex);
2706
2707 if (ctx->iocb && ctx->iocb->ki_complete)
2708 ctx->iocb->ki_complete(ctx->iocb, ctx->rc, 0);
2709 else
2710 complete(&ctx->done);
2711 }
2712
2713 ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
2714 {
2715 struct file *file = iocb->ki_filp;
2716 ssize_t total_written = 0;
2717 struct cifsFileInfo *cfile;
2718 struct cifs_tcon *tcon;
2719 struct cifs_sb_info *cifs_sb;
2720 struct cifs_aio_ctx *ctx;
2721 struct iov_iter saved_from = *from;
2722 int rc;
2723
2724 /*
2725 * BB - optimize the way when signing is disabled. We can drop this
2726 * extra memory-to-memory copying and use iovec buffers for constructing
2727 * write request.
2728 */
2729
2730 rc = generic_write_checks(iocb, from);
2731 if (rc <= 0)
2732 return rc;
2733
2734 cifs_sb = CIFS_FILE_SB(file);
2735 cfile = file->private_data;
2736 tcon = tlink_tcon(cfile->tlink);
2737
2738 if (!tcon->ses->server->ops->async_writev)
2739 return -ENOSYS;
2740
2741 ctx = cifs_aio_ctx_alloc();
2742 if (!ctx)
2743 return -ENOMEM;
2744
2745 ctx->cfile = cifsFileInfo_get(cfile);
2746
2747 if (!is_sync_kiocb(iocb))
2748 ctx->iocb = iocb;
2749
2750 ctx->pos = iocb->ki_pos;
2751
2752 rc = setup_aio_ctx_iter(ctx, from, WRITE);
2753 if (rc) {
2754 kref_put(&ctx->refcount, cifs_aio_ctx_release);
2755 return rc;
2756 }
2757
2758 /* grab a lock here due to read response handlers can access ctx */
2759 mutex_lock(&ctx->aio_mutex);
2760
2761 rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &saved_from,
2762 cfile, cifs_sb, &ctx->list, ctx);
2763
2764 /*
2765 * If at least one write was successfully sent, then discard any rc
2766 * value from the later writes. If the other write succeeds, then
2767 * we'll end up returning whatever was written. If it fails, then
2768 * we'll get a new rc value from that.
2769 */
2770 if (!list_empty(&ctx->list))
2771 rc = 0;
2772
2773 mutex_unlock(&ctx->aio_mutex);
2774
2775 if (rc) {
2776 kref_put(&ctx->refcount, cifs_aio_ctx_release);
2777 return rc;
2778 }
2779
2780 if (!is_sync_kiocb(iocb)) {
2781 kref_put(&ctx->refcount, cifs_aio_ctx_release);
2782 return -EIOCBQUEUED;
2783 }
2784
2785 rc = wait_for_completion_killable(&ctx->done);
2786 if (rc) {
2787 mutex_lock(&ctx->aio_mutex);
2788 ctx->rc = rc = -EINTR;
2789 total_written = ctx->total_len;
2790 mutex_unlock(&ctx->aio_mutex);
2791 } else {
2792 rc = ctx->rc;
2793 total_written = ctx->total_len;
2794 }
2795
2796 kref_put(&ctx->refcount, cifs_aio_ctx_release);
2797
2798 if (unlikely(!total_written))
2799 return rc;
2800
2801 iocb->ki_pos += total_written;
2802 return total_written;
2803 }
2804
2805 static ssize_t
2806 cifs_writev(struct kiocb *iocb, struct iov_iter *from)
2807 {
2808 struct file *file = iocb->ki_filp;
2809 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
2810 struct inode *inode = file->f_mapping->host;
2811 struct cifsInodeInfo *cinode = CIFS_I(inode);
2812 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
2813 ssize_t rc;
2814
2815 inode_lock(inode);
2816 /*
2817 * We need to hold the sem to be sure nobody modifies lock list
2818 * with a brlock that prevents writing.
2819 */
2820 down_read(&cinode->lock_sem);
2821
2822 rc = generic_write_checks(iocb, from);
2823 if (rc <= 0)
2824 goto out;
2825
2826 if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
2827 server->vals->exclusive_lock_type, NULL,
2828 CIFS_WRITE_OP))
2829 rc = __generic_file_write_iter(iocb, from);
2830 else
2831 rc = -EACCES;
2832 out:
2833 up_read(&cinode->lock_sem);
2834 inode_unlock(inode);
2835
2836 if (rc > 0)
2837 rc = generic_write_sync(iocb, rc);
2838 return rc;
2839 }
2840
2841 ssize_t
2842 cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from)
2843 {
2844 struct inode *inode = file_inode(iocb->ki_filp);
2845 struct cifsInodeInfo *cinode = CIFS_I(inode);
2846 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2847 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
2848 iocb->ki_filp->private_data;
2849 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2850 ssize_t written;
2851
2852 written = cifs_get_writer(cinode);
2853 if (written)
2854 return written;
2855
2856 if (CIFS_CACHE_WRITE(cinode)) {
2857 if (cap_unix(tcon->ses) &&
2858 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
2859 && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) {
2860 written = generic_file_write_iter(iocb, from);
2861 goto out;
2862 }
2863 written = cifs_writev(iocb, from);
2864 goto out;
2865 }
2866 /*
2867 * For non-oplocked files in strict cache mode we need to write the data
2868 * to the server exactly from the pos to pos+len-1 rather than flush all
2869 * affected pages because it may cause a error with mandatory locks on
2870 * these pages but not on the region from pos to ppos+len-1.
2871 */
2872 written = cifs_user_writev(iocb, from);
2873 if (written > 0 && CIFS_CACHE_READ(cinode)) {
2874 /*
2875 * Windows 7 server can delay breaking level2 oplock if a write
2876 * request comes - break it on the client to prevent reading
2877 * an old data.
2878 */
2879 cifs_zap_mapping(inode);
2880 cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n",
2881 inode);
2882 cinode->oplock = 0;
2883 }
2884 out:
2885 cifs_put_writer(cinode);
2886 return written;
2887 }
2888
2889 static struct cifs_readdata *
2890 cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
2891 {
2892 struct cifs_readdata *rdata;
2893
2894 rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),
2895 GFP_KERNEL);
2896 if (rdata != NULL) {
2897 kref_init(&rdata->refcount);
2898 INIT_LIST_HEAD(&rdata->list);
2899 init_completion(&rdata->done);
2900 INIT_WORK(&rdata->work, complete);
2901 }
2902
2903 return rdata;
2904 }
2905
2906 void
2907 cifs_readdata_release(struct kref *refcount)
2908 {
2909 struct cifs_readdata *rdata = container_of(refcount,
2910 struct cifs_readdata, refcount);
2911
2912 if (rdata->cfile)
2913 cifsFileInfo_put(rdata->cfile);
2914
2915 kfree(rdata);
2916 }
2917
2918 static int
2919 cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages)
2920 {
2921 int rc = 0;
2922 struct page *page;
2923 unsigned int i;
2924
2925 for (i = 0; i < nr_pages; i++) {
2926 page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2927 if (!page) {
2928 rc = -ENOMEM;
2929 break;
2930 }
2931 rdata->pages[i] = page;
2932 }
2933
2934 if (rc) {
2935 for (i = 0; i < nr_pages; i++) {
2936 put_page(rdata->pages[i]);
2937 rdata->pages[i] = NULL;
2938 }
2939 }
2940 return rc;
2941 }
2942
2943 static void
2944 cifs_uncached_readdata_release(struct kref *refcount)
2945 {
2946 struct cifs_readdata *rdata = container_of(refcount,
2947 struct cifs_readdata, refcount);
2948 unsigned int i;
2949
2950 kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
2951 for (i = 0; i < rdata->nr_pages; i++) {
2952 put_page(rdata->pages[i]);
2953 rdata->pages[i] = NULL;
2954 }
2955 cifs_readdata_release(refcount);
2956 }
2957
2958 /**
2959 * cifs_readdata_to_iov - copy data from pages in response to an iovec
2960 * @rdata: the readdata response with list of pages holding data
2961 * @iter: destination for our data
2962 *
2963 * This function copies data from a list of pages in a readdata response into
2964 * an array of iovecs. It will first calculate where the data should go
2965 * based on the info in the readdata and then copy the data into that spot.
2966 */
2967 static int
2968 cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
2969 {
2970 size_t remaining = rdata->got_bytes;
2971 unsigned int i;
2972
2973 for (i = 0; i < rdata->nr_pages; i++) {
2974 struct page *page = rdata->pages[i];
2975 size_t copy = min_t(size_t, remaining, PAGE_SIZE);
2976 size_t written;
2977
2978 if (unlikely(iter->type & ITER_PIPE)) {
2979 void *addr = kmap_atomic(page);
2980
2981 written = copy_to_iter(addr, copy, iter);
2982 kunmap_atomic(addr);
2983 } else
2984 written = copy_page_to_iter(page, 0, copy, iter);
2985 remaining -= written;
2986 if (written < copy && iov_iter_count(iter) > 0)
2987 break;
2988 }
2989 return remaining ? -EFAULT : 0;
2990 }
2991
2992 static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
2993
2994 static void
2995 cifs_uncached_readv_complete(struct work_struct *work)
2996 {
2997 struct cifs_readdata *rdata = container_of(work,
2998 struct cifs_readdata, work);
2999
3000 complete(&rdata->done);
3001 collect_uncached_read_data(rdata->ctx);
3002 /* the below call can possibly free the last ref to aio ctx */
3003 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
3004 }
3005
3006 static int
3007 uncached_fill_pages(struct TCP_Server_Info *server,
3008 struct cifs_readdata *rdata, struct iov_iter *iter,
3009 unsigned int len)
3010 {
3011 int result = 0;
3012 unsigned int i;
3013 unsigned int nr_pages = rdata->nr_pages;
3014
3015 rdata->got_bytes = 0;
3016 rdata->tailsz = PAGE_SIZE;
3017 for (i = 0; i < nr_pages; i++) {
3018 struct page *page = rdata->pages[i];
3019 size_t n;
3020
3021 if (len <= 0) {
3022 /* no need to hold page hostage */
3023 rdata->pages[i] = NULL;
3024 rdata->nr_pages--;
3025 put_page(page);
3026 continue;
3027 }
3028 n = len;
3029 if (len >= PAGE_SIZE) {
3030 /* enough data to fill the page */
3031 n = PAGE_SIZE;
3032 len -= n;
3033 } else {
3034 zero_user(page, len, PAGE_SIZE - len);
3035 rdata->tailsz = len;
3036 len = 0;
3037 }
3038 if (iter)
3039 result = copy_page_from_iter(page, 0, n, iter);
3040 else
3041 result = cifs_read_page_from_socket(server, page, n);
3042 if (result < 0)
3043 break;
3044
3045 rdata->got_bytes += result;
3046 }
3047
3048 return rdata->got_bytes > 0 && result != -ECONNABORTED ?
3049 rdata->got_bytes : result;
3050 }
3051
3052 static int
3053 cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
3054 struct cifs_readdata *rdata, unsigned int len)
3055 {
3056 return uncached_fill_pages(server, rdata, NULL, len);
3057 }
3058
3059 static int
3060 cifs_uncached_copy_into_pages(struct TCP_Server_Info *server,
3061 struct cifs_readdata *rdata,
3062 struct iov_iter *iter)
3063 {
3064 return uncached_fill_pages(server, rdata, iter, iter->count);
3065 }
3066
3067 static int
3068 cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
3069 struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
3070 struct cifs_aio_ctx *ctx)
3071 {
3072 struct cifs_readdata *rdata;
3073 unsigned int npages, rsize, credits;
3074 size_t cur_len;
3075 int rc;
3076 pid_t pid;
3077 struct TCP_Server_Info *server;
3078
3079 server = tlink_tcon(open_file->tlink)->ses->server;
3080
3081 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3082 pid = open_file->pid;
3083 else
3084 pid = current->tgid;
3085
3086 do {
3087 rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
3088 &rsize, &credits);
3089 if (rc)
3090 break;
3091
3092 cur_len = min_t(const size_t, len, rsize);
3093 npages = DIV_ROUND_UP(cur_len, PAGE_SIZE);
3094
3095 /* allocate a readdata struct */
3096 rdata = cifs_readdata_alloc(npages,
3097 cifs_uncached_readv_complete);
3098 if (!rdata) {
3099 add_credits_and_wake_if(server, credits, 0);
3100 rc = -ENOMEM;
3101 break;
3102 }
3103
3104 rc = cifs_read_allocate_pages(rdata, npages);
3105 if (rc)
3106 goto error;
3107
3108 rdata->cfile = cifsFileInfo_get(open_file);
3109 rdata->nr_pages = npages;
3110 rdata->offset = offset;
3111 rdata->bytes = cur_len;
3112 rdata->pid = pid;
3113 rdata->pagesz = PAGE_SIZE;
3114 rdata->read_into_pages = cifs_uncached_read_into_pages;
3115 rdata->copy_into_pages = cifs_uncached_copy_into_pages;
3116 rdata->credits = credits;
3117 rdata->ctx = ctx;
3118 kref_get(&ctx->refcount);
3119
3120 if (!rdata->cfile->invalidHandle ||
3121 !(rc = cifs_reopen_file(rdata->cfile, true)))
3122 rc = server->ops->async_readv(rdata);
3123 error:
3124 if (rc) {
3125 add_credits_and_wake_if(server, rdata->credits, 0);
3126 kref_put(&rdata->refcount,
3127 cifs_uncached_readdata_release);
3128 if (rc == -EAGAIN)
3129 continue;
3130 break;
3131 }
3132
3133 list_add_tail(&rdata->list, rdata_list);
3134 offset += cur_len;
3135 len -= cur_len;
3136 } while (len > 0);
3137
3138 return rc;
3139 }
3140
3141 static void
3142 collect_uncached_read_data(struct cifs_aio_ctx *ctx)
3143 {
3144 struct cifs_readdata *rdata, *tmp;
3145 struct iov_iter *to = &ctx->iter;
3146 struct cifs_sb_info *cifs_sb;
3147 struct cifs_tcon *tcon;
3148 unsigned int i;
3149 int rc;
3150
3151 tcon = tlink_tcon(ctx->cfile->tlink);
3152 cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb);
3153
3154 mutex_lock(&ctx->aio_mutex);
3155
3156 if (list_empty(&ctx->list)) {
3157 mutex_unlock(&ctx->aio_mutex);
3158 return;
3159 }
3160
3161 rc = ctx->rc;
3162 /* the loop below should proceed in the order of increasing offsets */
3163 again:
3164 list_for_each_entry_safe(rdata, tmp, &ctx->list, list) {
3165 if (!rc) {
3166 if (!try_wait_for_completion(&rdata->done)) {
3167 mutex_unlock(&ctx->aio_mutex);
3168 return;
3169 }
3170
3171 if (rdata->result == -EAGAIN) {
3172 /* resend call if it's a retryable error */
3173 struct list_head tmp_list;
3174 unsigned int got_bytes = rdata->got_bytes;
3175
3176 list_del_init(&rdata->list);
3177 INIT_LIST_HEAD(&tmp_list);
3178
3179 /*
3180 * Got a part of data and then reconnect has
3181 * happened -- fill the buffer and continue
3182 * reading.
3183 */
3184 if (got_bytes && got_bytes < rdata->bytes) {
3185 rc = cifs_readdata_to_iov(rdata, to);
3186 if (rc) {
3187 kref_put(&rdata->refcount,
3188 cifs_uncached_readdata_release);
3189 continue;
3190 }
3191 }
3192
3193 rc = cifs_send_async_read(
3194 rdata->offset + got_bytes,
3195 rdata->bytes - got_bytes,
3196 rdata->cfile, cifs_sb,
3197 &tmp_list, ctx);
3198
3199 list_splice(&tmp_list, &ctx->list);
3200
3201 kref_put(&rdata->refcount,
3202 cifs_uncached_readdata_release);
3203 goto again;
3204 } else if (rdata->result)
3205 rc = rdata->result;
3206 else
3207 rc = cifs_readdata_to_iov(rdata, to);
3208
3209 /* if there was a short read -- discard anything left */
3210 if (rdata->got_bytes && rdata->got_bytes < rdata->bytes)
3211 rc = -ENODATA;
3212 }
3213 list_del_init(&rdata->list);
3214 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
3215 }
3216
3217 for (i = 0; i < ctx->npages; i++) {
3218 if (ctx->should_dirty)
3219 set_page_dirty(ctx->bv[i].bv_page);
3220 put_page(ctx->bv[i].bv_page);
3221 }
3222
3223 ctx->total_len = ctx->len - iov_iter_count(to);
3224
3225 cifs_stats_bytes_read(tcon, ctx->total_len);
3226
3227 /* mask nodata case */
3228 if (rc == -ENODATA)
3229 rc = 0;
3230
3231 ctx->rc = (rc == 0) ? ctx->total_len : rc;
3232
3233 mutex_unlock(&ctx->aio_mutex);
3234
3235 if (ctx->iocb && ctx->iocb->ki_complete)
3236 ctx->iocb->ki_complete(ctx->iocb, ctx->rc, 0);
3237 else
3238 complete(&ctx->done);
3239 }
3240
3241 ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to)
3242 {
3243 struct file *file = iocb->ki_filp;
3244 ssize_t rc;
3245 size_t len;
3246 ssize_t total_read = 0;
3247 loff_t offset = iocb->ki_pos;
3248 struct cifs_sb_info *cifs_sb;
3249 struct cifs_tcon *tcon;
3250 struct cifsFileInfo *cfile;
3251 struct cifs_aio_ctx *ctx;
3252
3253 len = iov_iter_count(to);
3254 if (!len)
3255 return 0;
3256
3257 cifs_sb = CIFS_FILE_SB(file);
3258 cfile = file->private_data;
3259 tcon = tlink_tcon(cfile->tlink);
3260
3261 if (!tcon->ses->server->ops->async_readv)
3262 return -ENOSYS;
3263
3264 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
3265 cifs_dbg(FYI, "attempting read on write only file instance\n");
3266
3267 ctx = cifs_aio_ctx_alloc();
3268 if (!ctx)
3269 return -ENOMEM;
3270
3271 ctx->cfile = cifsFileInfo_get(cfile);
3272
3273 if (!is_sync_kiocb(iocb))
3274 ctx->iocb = iocb;
3275
3276 if (to->type == ITER_IOVEC)
3277 ctx->should_dirty = true;
3278
3279 rc = setup_aio_ctx_iter(ctx, to, READ);
3280 if (rc) {
3281 kref_put(&ctx->refcount, cifs_aio_ctx_release);
3282 return rc;
3283 }
3284
3285 len = ctx->len;
3286
3287 /* grab a lock here due to read response handlers can access ctx */
3288 mutex_lock(&ctx->aio_mutex);
3289
3290 rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx);
3291
3292 /* if at least one read request send succeeded, then reset rc */
3293 if (!list_empty(&ctx->list))
3294 rc = 0;
3295
3296 mutex_unlock(&ctx->aio_mutex);
3297
3298 if (rc) {
3299 kref_put(&ctx->refcount, cifs_aio_ctx_release);
3300 return rc;
3301 }
3302
3303 if (!is_sync_kiocb(iocb)) {
3304 kref_put(&ctx->refcount, cifs_aio_ctx_release);
3305 return -EIOCBQUEUED;
3306 }
3307
3308 rc = wait_for_completion_killable(&ctx->done);
3309 if (rc) {
3310 mutex_lock(&ctx->aio_mutex);
3311 ctx->rc = rc = -EINTR;
3312 total_read = ctx->total_len;
3313 mutex_unlock(&ctx->aio_mutex);
3314 } else {
3315 rc = ctx->rc;
3316 total_read = ctx->total_len;
3317 }
3318
3319 kref_put(&ctx->refcount, cifs_aio_ctx_release);
3320
3321 if (total_read) {
3322 iocb->ki_pos += total_read;
3323 return total_read;
3324 }
3325 return rc;
3326 }
3327
3328 ssize_t
3329 cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to)
3330 {
3331 struct inode *inode = file_inode(iocb->ki_filp);
3332 struct cifsInodeInfo *cinode = CIFS_I(inode);
3333 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3334 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
3335 iocb->ki_filp->private_data;
3336 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
3337 int rc = -EACCES;
3338
3339 /*
3340 * In strict cache mode we need to read from the server all the time
3341 * if we don't have level II oplock because the server can delay mtime
3342 * change - so we can't make a decision about inode invalidating.
3343 * And we can also fail with pagereading if there are mandatory locks
3344 * on pages affected by this read but not on the region from pos to
3345 * pos+len-1.
3346 */
3347 if (!CIFS_CACHE_READ(cinode))
3348 return cifs_user_readv(iocb, to);
3349
3350 if (cap_unix(tcon->ses) &&
3351 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
3352 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
3353 return generic_file_read_iter(iocb, to);
3354
3355 /*
3356 * We need to hold the sem to be sure nobody modifies lock list
3357 * with a brlock that prevents reading.
3358 */
3359 down_read(&cinode->lock_sem);
3360 if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to),
3361 tcon->ses->server->vals->shared_lock_type,
3362 NULL, CIFS_READ_OP))
3363 rc = generic_file_read_iter(iocb, to);
3364 up_read(&cinode->lock_sem);
3365 return rc;
3366 }
3367
3368 static ssize_t
3369 cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
3370 {
3371 int rc = -EACCES;
3372 unsigned int bytes_read = 0;
3373 unsigned int total_read;
3374 unsigned int current_read_size;
3375 unsigned int rsize;
3376 struct cifs_sb_info *cifs_sb;
3377 struct cifs_tcon *tcon;
3378 struct TCP_Server_Info *server;
3379 unsigned int xid;
3380 char *cur_offset;
3381 struct cifsFileInfo *open_file;
3382 struct cifs_io_parms io_parms;
3383 int buf_type = CIFS_NO_BUFFER;
3384 __u32 pid;
3385
3386 xid = get_xid();
3387 cifs_sb = CIFS_FILE_SB(file);
3388
3389 /* FIXME: set up handlers for larger reads and/or convert to async */
3390 rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
3391
3392 if (file->private_data == NULL) {
3393 rc = -EBADF;
3394 free_xid(xid);
3395 return rc;
3396 }
3397 open_file = file->private_data;
3398 tcon = tlink_tcon(open_file->tlink);
3399 server = tcon->ses->server;
3400
3401 if (!server->ops->sync_read) {
3402 free_xid(xid);
3403 return -ENOSYS;
3404 }
3405
3406 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3407 pid = open_file->pid;
3408 else
3409 pid = current->tgid;
3410
3411 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
3412 cifs_dbg(FYI, "attempting read on write only file instance\n");
3413
3414 for (total_read = 0, cur_offset = read_data; read_size > total_read;
3415 total_read += bytes_read, cur_offset += bytes_read) {
3416 do {
3417 current_read_size = min_t(uint, read_size - total_read,
3418 rsize);
3419 /*
3420 * For windows me and 9x we do not want to request more
3421 * than it negotiated since it will refuse the read
3422 * then.
3423 */
3424 if ((tcon->ses) && !(tcon->ses->capabilities &
3425 tcon->ses->server->vals->cap_large_files)) {
3426 current_read_size = min_t(uint,
3427 current_read_size, CIFSMaxBufSize);
3428 }
3429 if (open_file->invalidHandle) {
3430 rc = cifs_reopen_file(open_file, true);
3431 if (rc != 0)
3432 break;
3433 }
3434 io_parms.pid = pid;
3435 io_parms.tcon = tcon;
3436 io_parms.offset = *offset;
3437 io_parms.length = current_read_size;
3438 rc = server->ops->sync_read(xid, &open_file->fid, &io_parms,
3439 &bytes_read, &cur_offset,
3440 &buf_type);
3441 } while (rc == -EAGAIN);
3442
3443 if (rc || (bytes_read == 0)) {
3444 if (total_read) {
3445 break;
3446 } else {
3447 free_xid(xid);
3448 return rc;
3449 }
3450 } else {
3451 cifs_stats_bytes_read(tcon, total_read);
3452 *offset += bytes_read;
3453 }
3454 }
3455 free_xid(xid);
3456 return total_read;
3457 }
3458
3459 /*
3460 * If the page is mmap'ed into a process' page tables, then we need to make
3461 * sure that it doesn't change while being written back.
3462 */
3463 static int
3464 cifs_page_mkwrite(struct vm_fault *vmf)
3465 {
3466 struct page *page = vmf->page;
3467
3468 lock_page(page);
3469 return VM_FAULT_LOCKED;
3470 }
3471
3472 static const struct vm_operations_struct cifs_file_vm_ops = {
3473 .fault = filemap_fault,
3474 .map_pages = filemap_map_pages,
3475 .page_mkwrite = cifs_page_mkwrite,
3476 };
3477
3478 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
3479 {
3480 int rc, xid;
3481 struct inode *inode = file_inode(file);
3482
3483 xid = get_xid();
3484
3485 if (!CIFS_CACHE_READ(CIFS_I(inode))) {
3486 rc = cifs_zap_mapping(inode);
3487 if (rc)
3488 return rc;
3489 }
3490
3491 rc = generic_file_mmap(file, vma);
3492 if (rc == 0)
3493 vma->vm_ops = &cifs_file_vm_ops;
3494 free_xid(xid);
3495 return rc;
3496 }
3497
3498 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
3499 {
3500 int rc, xid;
3501
3502 xid = get_xid();
3503 rc = cifs_revalidate_file(file);
3504 if (rc) {
3505 cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
3506 rc);
3507 free_xid(xid);
3508 return rc;
3509 }
3510 rc = generic_file_mmap(file, vma);
3511 if (rc == 0)
3512 vma->vm_ops = &cifs_file_vm_ops;
3513 free_xid(xid);
3514 return rc;
3515 }
3516
3517 static void
3518 cifs_readv_complete(struct work_struct *work)
3519 {
3520 unsigned int i, got_bytes;
3521 struct cifs_readdata *rdata = container_of(work,
3522 struct cifs_readdata, work);
3523
3524 got_bytes = rdata->got_bytes;
3525 for (i = 0; i < rdata->nr_pages; i++) {
3526 struct page *page = rdata->pages[i];
3527
3528 lru_cache_add_file(page);
3529
3530 if (rdata->result == 0 ||
3531 (rdata->result == -EAGAIN && got_bytes)) {
3532 flush_dcache_page(page);
3533 SetPageUptodate(page);
3534 }
3535
3536 unlock_page(page);
3537
3538 if (rdata->result == 0 ||
3539 (rdata->result == -EAGAIN && got_bytes))
3540 cifs_readpage_to_fscache(rdata->mapping->host, page);
3541
3542 got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes);
3543
3544 put_page(page);
3545 rdata->pages[i] = NULL;
3546 }
3547 kref_put(&rdata->refcount, cifs_readdata_release);
3548 }
3549
3550 static int
3551 readpages_fill_pages(struct TCP_Server_Info *server,
3552 struct cifs_readdata *rdata, struct iov_iter *iter,
3553 unsigned int len)
3554 {
3555 int result = 0;
3556 unsigned int i;
3557 u64 eof;
3558 pgoff_t eof_index;
3559 unsigned int nr_pages = rdata->nr_pages;
3560
3561 /* determine the eof that the server (probably) has */
3562 eof = CIFS_I(rdata->mapping->host)->server_eof;
3563 eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0;
3564 cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index);
3565
3566 rdata->got_bytes = 0;
3567 rdata->tailsz = PAGE_SIZE;
3568 for (i = 0; i < nr_pages; i++) {
3569 struct page *page = rdata->pages[i];
3570 size_t n = PAGE_SIZE;
3571
3572 if (len >= PAGE_SIZE) {
3573 len -= PAGE_SIZE;
3574 } else if (len > 0) {
3575 /* enough for partial page, fill and zero the rest */
3576 zero_user(page, len, PAGE_SIZE - len);
3577 n = rdata->tailsz = len;
3578 len = 0;
3579 } else if (page->index > eof_index) {
3580 /*
3581 * The VFS will not try to do readahead past the
3582 * i_size, but it's possible that we have outstanding
3583 * writes with gaps in the middle and the i_size hasn't
3584 * caught up yet. Populate those with zeroed out pages
3585 * to prevent the VFS from repeatedly attempting to
3586 * fill them until the writes are flushed.
3587 */
3588 zero_user(page, 0, PAGE_SIZE);
3589 lru_cache_add_file(page);
3590 flush_dcache_page(page);
3591 SetPageUptodate(page);
3592 unlock_page(page);
3593 put_page(page);
3594 rdata->pages[i] = NULL;
3595 rdata->nr_pages--;
3596 continue;
3597 } else {
3598 /* no need to hold page hostage */
3599 lru_cache_add_file(page);
3600 unlock_page(page);
3601 put_page(page);
3602 rdata->pages[i] = NULL;
3603 rdata->nr_pages--;
3604 continue;
3605 }
3606
3607 if (iter)
3608 result = copy_page_from_iter(page, 0, n, iter);
3609 else
3610 result = cifs_read_page_from_socket(server, page, n);
3611 if (result < 0)
3612 break;
3613
3614 rdata->got_bytes += result;
3615 }
3616
3617 return rdata->got_bytes > 0 && result != -ECONNABORTED ?
3618 rdata->got_bytes : result;
3619 }
3620
3621 static int
3622 cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
3623 struct cifs_readdata *rdata, unsigned int len)
3624 {
3625 return readpages_fill_pages(server, rdata, NULL, len);
3626 }
3627
3628 static int
3629 cifs_readpages_copy_into_pages(struct TCP_Server_Info *server,
3630 struct cifs_readdata *rdata,
3631 struct iov_iter *iter)
3632 {
3633 return readpages_fill_pages(server, rdata, iter, iter->count);
3634 }
3635
3636 static int
3637 readpages_get_pages(struct address_space *mapping, struct list_head *page_list,
3638 unsigned int rsize, struct list_head *tmplist,
3639 unsigned int *nr_pages, loff_t *offset, unsigned int *bytes)
3640 {
3641 struct page *page, *tpage;
3642 unsigned int expected_index;
3643 int rc;
3644 gfp_t gfp = readahead_gfp_mask(mapping);
3645
3646 INIT_LIST_HEAD(tmplist);
3647
3648 page = list_entry(page_list->prev, struct page, lru);
3649
3650 /*
3651 * Lock the page and put it in the cache. Since no one else
3652 * should have access to this page, we're safe to simply set
3653 * PG_locked without checking it first.
3654 */
3655 __SetPageLocked(page);
3656 rc = add_to_page_cache_locked(page, mapping,
3657 page->index, gfp);
3658
3659 /* give up if we can't stick it in the cache */
3660 if (rc) {
3661 __ClearPageLocked(page);
3662 return rc;
3663 }
3664
3665 /* move first page to the tmplist */
3666 *offset = (loff_t)page->index << PAGE_SHIFT;
3667 *bytes = PAGE_SIZE;
3668 *nr_pages = 1;
3669 list_move_tail(&page->lru, tmplist);
3670
3671 /* now try and add more pages onto the request */
3672 expected_index = page->index + 1;
3673 list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
3674 /* discontinuity ? */
3675 if (page->index != expected_index)
3676 break;
3677
3678 /* would this page push the read over the rsize? */
3679 if (*bytes + PAGE_SIZE > rsize)
3680 break;
3681
3682 __SetPageLocked(page);
3683 if (add_to_page_cache_locked(page, mapping, page->index, gfp)) {
3684 __ClearPageLocked(page);
3685 break;
3686 }
3687 list_move_tail(&page->lru, tmplist);
3688 (*bytes) += PAGE_SIZE;
3689 expected_index++;
3690 (*nr_pages)++;
3691 }
3692 return rc;
3693 }
3694
3695 static int cifs_readpages(struct file *file, struct address_space *mapping,
3696 struct list_head *page_list, unsigned num_pages)
3697 {
3698 int rc;
3699 struct list_head tmplist;
3700 struct cifsFileInfo *open_file = file->private_data;
3701 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
3702 struct TCP_Server_Info *server;
3703 pid_t pid;
3704
3705 /*
3706 * Reads as many pages as possible from fscache. Returns -ENOBUFS
3707 * immediately if the cookie is negative
3708 *
3709 * After this point, every page in the list might have PG_fscache set,
3710 * so we will need to clean that up off of every page we don't use.
3711 */
3712 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
3713 &num_pages);
3714 if (rc == 0)
3715 return rc;
3716
3717 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3718 pid = open_file->pid;
3719 else
3720 pid = current->tgid;
3721
3722 rc = 0;
3723 server = tlink_tcon(open_file->tlink)->ses->server;
3724
3725 cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
3726 __func__, file, mapping, num_pages);
3727
3728 /*
3729 * Start with the page at end of list and move it to private
3730 * list. Do the same with any following pages until we hit
3731 * the rsize limit, hit an index discontinuity, or run out of
3732 * pages. Issue the async read and then start the loop again
3733 * until the list is empty.
3734 *
3735 * Note that list order is important. The page_list is in
3736 * the order of declining indexes. When we put the pages in
3737 * the rdata->pages, then we want them in increasing order.
3738 */
3739 while (!list_empty(page_list)) {
3740 unsigned int i, nr_pages, bytes, rsize;
3741 loff_t offset;
3742 struct page *page, *tpage;
3743 struct cifs_readdata *rdata;
3744 unsigned credits;
3745
3746 rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
3747 &rsize, &credits);
3748 if (rc)
3749 break;
3750
3751 /*
3752 * Give up immediately if rsize is too small to read an entire
3753 * page. The VFS will fall back to readpage. We should never
3754 * reach this point however since we set ra_pages to 0 when the
3755 * rsize is smaller than a cache page.
3756 */
3757 if (unlikely(rsize < PAGE_SIZE)) {
3758 add_credits_and_wake_if(server, credits, 0);
3759 return 0;
3760 }
3761
3762 rc = readpages_get_pages(mapping, page_list, rsize, &tmplist,
3763 &nr_pages, &offset, &bytes);
3764 if (rc) {
3765 add_credits_and_wake_if(server, credits, 0);
3766 break;
3767 }
3768
3769 rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete);
3770 if (!rdata) {
3771 /* best to give up if we're out of mem */
3772 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3773 list_del(&page->lru);
3774 lru_cache_add_file(page);
3775 unlock_page(page);
3776 put_page(page);
3777 }
3778 rc = -ENOMEM;
3779 add_credits_and_wake_if(server, credits, 0);
3780 break;
3781 }
3782
3783 rdata->cfile = cifsFileInfo_get(open_file);
3784 rdata->mapping = mapping;
3785 rdata->offset = offset;
3786 rdata->bytes = bytes;
3787 rdata->pid = pid;
3788 rdata->pagesz = PAGE_SIZE;
3789 rdata->read_into_pages = cifs_readpages_read_into_pages;
3790 rdata->copy_into_pages = cifs_readpages_copy_into_pages;
3791 rdata->credits = credits;
3792
3793 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3794 list_del(&page->lru);
3795 rdata->pages[rdata->nr_pages++] = page;
3796 }
3797
3798 if (!rdata->cfile->invalidHandle ||
3799 !(rc = cifs_reopen_file(rdata->cfile, true)))
3800 rc = server->ops->async_readv(rdata);
3801 if (rc) {
3802 add_credits_and_wake_if(server, rdata->credits, 0);
3803 for (i = 0; i < rdata->nr_pages; i++) {
3804 page = rdata->pages[i];
3805 lru_cache_add_file(page);
3806 unlock_page(page);
3807 put_page(page);
3808 }
3809 /* Fallback to the readpage in error/reconnect cases */
3810 kref_put(&rdata->refcount, cifs_readdata_release);
3811 break;
3812 }
3813
3814 kref_put(&rdata->refcount, cifs_readdata_release);
3815 }
3816
3817 /* Any pages that have been shown to fscache but didn't get added to
3818 * the pagecache must be uncached before they get returned to the
3819 * allocator.
3820 */
3821 cifs_fscache_readpages_cancel(mapping->host, page_list);
3822 return rc;
3823 }
3824
3825 /*
3826 * cifs_readpage_worker must be called with the page pinned
3827 */
3828 static int cifs_readpage_worker(struct file *file, struct page *page,
3829 loff_t *poffset)
3830 {
3831 char *read_data;
3832 int rc;
3833
3834 /* Is the page cached? */
3835 rc = cifs_readpage_from_fscache(file_inode(file), page);
3836 if (rc == 0)
3837 goto read_complete;
3838
3839 read_data = kmap(page);
3840 /* for reads over a certain size could initiate async read ahead */
3841
3842 rc = cifs_read(file, read_data, PAGE_SIZE, poffset);
3843
3844 if (rc < 0)
3845 goto io_error;
3846 else
3847 cifs_dbg(FYI, "Bytes read %d\n", rc);
3848
3849 file_inode(file)->i_atime =
3850 current_time(file_inode(file));
3851
3852 if (PAGE_SIZE > rc)
3853 memset(read_data + rc, 0, PAGE_SIZE - rc);
3854
3855 flush_dcache_page(page);
3856 SetPageUptodate(page);
3857
3858 /* send this page to the cache */
3859 cifs_readpage_to_fscache(file_inode(file), page);
3860
3861 rc = 0;
3862
3863 io_error:
3864 kunmap(page);
3865 unlock_page(page);
3866
3867 read_complete:
3868 return rc;
3869 }
3870
3871 static int cifs_readpage(struct file *file, struct page *page)
3872 {
3873 loff_t offset = (loff_t)page->index << PAGE_SHIFT;
3874 int rc = -EACCES;
3875 unsigned int xid;
3876
3877 xid = get_xid();
3878
3879 if (file->private_data == NULL) {
3880 rc = -EBADF;
3881 free_xid(xid);
3882 return rc;
3883 }
3884
3885 cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n",
3886 page, (int)offset, (int)offset);
3887
3888 rc = cifs_readpage_worker(file, page, &offset);
3889
3890 free_xid(xid);
3891 return rc;
3892 }
3893
3894 static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
3895 {
3896 struct cifsFileInfo *open_file;
3897 struct cifs_tcon *tcon =
3898 cifs_sb_master_tcon(CIFS_SB(cifs_inode->vfs_inode.i_sb));
3899
3900 spin_lock(&tcon->open_file_lock);
3901 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
3902 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
3903 spin_unlock(&tcon->open_file_lock);
3904 return 1;
3905 }
3906 }
3907 spin_unlock(&tcon->open_file_lock);
3908 return 0;
3909 }
3910
3911 /* We do not want to update the file size from server for inodes
3912 open for write - to avoid races with writepage extending
3913 the file - in the future we could consider allowing
3914 refreshing the inode only on increases in the file size
3915 but this is tricky to do without racing with writebehind
3916 page caching in the current Linux kernel design */
3917 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
3918 {
3919 if (!cifsInode)
3920 return true;
3921
3922 if (is_inode_writable(cifsInode)) {
3923 /* This inode is open for write at least once */
3924 struct cifs_sb_info *cifs_sb;
3925
3926 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
3927 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
3928 /* since no page cache to corrupt on directio
3929 we can change size safely */
3930 return true;
3931 }
3932
3933 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
3934 return true;
3935
3936 return false;
3937 } else
3938 return true;
3939 }
3940
3941 static int cifs_write_begin(struct file *file, struct address_space *mapping,
3942 loff_t pos, unsigned len, unsigned flags,
3943 struct page **pagep, void **fsdata)
3944 {
3945 int oncethru = 0;
3946 pgoff_t index = pos >> PAGE_SHIFT;
3947 loff_t offset = pos & (PAGE_SIZE - 1);
3948 loff_t page_start = pos & PAGE_MASK;
3949 loff_t i_size;
3950 struct page *page;
3951 int rc = 0;
3952
3953 cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len);
3954
3955 start:
3956 page = grab_cache_page_write_begin(mapping, index, flags);
3957 if (!page) {
3958 rc = -ENOMEM;
3959 goto out;
3960 }
3961
3962 if (PageUptodate(page))
3963 goto out;
3964
3965 /*
3966 * If we write a full page it will be up to date, no need to read from
3967 * the server. If the write is short, we'll end up doing a sync write
3968 * instead.
3969 */
3970 if (len == PAGE_SIZE)
3971 goto out;
3972
3973 /*
3974 * optimize away the read when we have an oplock, and we're not
3975 * expecting to use any of the data we'd be reading in. That
3976 * is, when the page lies beyond the EOF, or straddles the EOF
3977 * and the write will cover all of the existing data.
3978 */
3979 if (CIFS_CACHE_READ(CIFS_I(mapping->host))) {
3980 i_size = i_size_read(mapping->host);
3981 if (page_start >= i_size ||
3982 (offset == 0 && (pos + len) >= i_size)) {
3983 zero_user_segments(page, 0, offset,
3984 offset + len,
3985 PAGE_SIZE);
3986 /*
3987 * PageChecked means that the parts of the page
3988 * to which we're not writing are considered up
3989 * to date. Once the data is copied to the
3990 * page, it can be set uptodate.
3991 */
3992 SetPageChecked(page);
3993 goto out;
3994 }
3995 }
3996
3997 if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) {
3998 /*
3999 * might as well read a page, it is fast enough. If we get
4000 * an error, we don't need to return it. cifs_write_end will
4001 * do a sync write instead since PG_uptodate isn't set.
4002 */
4003 cifs_readpage_worker(file, page, &page_start);
4004 put_page(page);
4005 oncethru = 1;
4006 goto start;
4007 } else {
4008 /* we could try using another file handle if there is one -
4009 but how would we lock it to prevent close of that handle
4010 racing with this read? In any case
4011 this will be written out by write_end so is fine */
4012 }
4013 out:
4014 *pagep = page;
4015 return rc;
4016 }
4017
4018 static int cifs_release_page(struct page *page, gfp_t gfp)
4019 {
4020 if (PagePrivate(page))
4021 return 0;
4022
4023 return cifs_fscache_release_page(page, gfp);
4024 }
4025
4026 static void cifs_invalidate_page(struct page *page, unsigned int offset,
4027 unsigned int length)
4028 {
4029 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
4030
4031 if (offset == 0 && length == PAGE_SIZE)
4032 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
4033 }
4034
4035 static int cifs_launder_page(struct page *page)
4036 {
4037 int rc = 0;
4038 loff_t range_start = page_offset(page);
4039 loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1);
4040 struct writeback_control wbc = {
4041 .sync_mode = WB_SYNC_ALL,
4042 .nr_to_write = 0,
4043 .range_start = range_start,
4044 .range_end = range_end,
4045 };
4046
4047 cifs_dbg(FYI, "Launder page: %p\n", page);
4048
4049 if (clear_page_dirty_for_io(page))
4050 rc = cifs_writepage_locked(page, &wbc);
4051
4052 cifs_fscache_invalidate_page(page, page->mapping->host);
4053 return rc;
4054 }
4055
4056 void cifs_oplock_break(struct work_struct *work)
4057 {
4058 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
4059 oplock_break);
4060 struct inode *inode = d_inode(cfile->dentry);
4061 struct cifsInodeInfo *cinode = CIFS_I(inode);
4062 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
4063 struct TCP_Server_Info *server = tcon->ses->server;
4064 int rc = 0;
4065
4066 wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS,
4067 TASK_UNINTERRUPTIBLE);
4068
4069 server->ops->downgrade_oplock(server, cinode,
4070 test_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cinode->flags));
4071
4072 if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) &&
4073 cifs_has_mand_locks(cinode)) {
4074 cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n",
4075 inode);
4076 cinode->oplock = 0;
4077 }
4078
4079 if (inode && S_ISREG(inode->i_mode)) {
4080 if (CIFS_CACHE_READ(cinode))
4081 break_lease(inode, O_RDONLY);
4082 else
4083 break_lease(inode, O_WRONLY);
4084 rc = filemap_fdatawrite(inode->i_mapping);
4085 if (!CIFS_CACHE_READ(cinode)) {
4086 rc = filemap_fdatawait(inode->i_mapping);
4087 mapping_set_error(inode->i_mapping, rc);
4088 cifs_zap_mapping(inode);
4089 }
4090 cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc);
4091 }
4092
4093 rc = cifs_push_locks(cfile);
4094 if (rc)
4095 cifs_dbg(VFS, "Push locks rc = %d\n", rc);
4096
4097 /*
4098 * releasing stale oplock after recent reconnect of smb session using
4099 * a now incorrect file handle is not a data integrity issue but do
4100 * not bother sending an oplock release if session to server still is
4101 * disconnected since oplock already released by the server
4102 */
4103 if (!cfile->oplock_break_cancelled) {
4104 rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid,
4105 cinode);
4106 cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
4107 }
4108 cifs_done_oplock_break(cinode);
4109 }
4110
4111 /*
4112 * The presence of cifs_direct_io() in the address space ops vector
4113 * allowes open() O_DIRECT flags which would have failed otherwise.
4114 *
4115 * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests
4116 * so this method should never be called.
4117 *
4118 * Direct IO is not yet supported in the cached mode.
4119 */
4120 static ssize_t
4121 cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter)
4122 {
4123 /*
4124 * FIXME
4125 * Eventually need to support direct IO for non forcedirectio mounts
4126 */
4127 return -EINVAL;
4128 }
4129
4130
4131 const struct address_space_operations cifs_addr_ops = {
4132 .readpage = cifs_readpage,
4133 .readpages = cifs_readpages,
4134 .writepage = cifs_writepage,
4135 .writepages = cifs_writepages,
4136 .write_begin = cifs_write_begin,
4137 .write_end = cifs_write_end,
4138 .set_page_dirty = __set_page_dirty_nobuffers,
4139 .releasepage = cifs_release_page,
4140 .direct_IO = cifs_direct_io,
4141 .invalidatepage = cifs_invalidate_page,
4142 .launder_page = cifs_launder_page,
4143 };
4144
4145 /*
4146 * cifs_readpages requires the server to support a buffer large enough to
4147 * contain the header plus one complete page of data. Otherwise, we need
4148 * to leave cifs_readpages out of the address space operations.
4149 */
4150 const struct address_space_operations cifs_addr_ops_smallbuf = {
4151 .readpage = cifs_readpage,
4152 .writepage = cifs_writepage,
4153 .writepages = cifs_writepages,
4154 .write_begin = cifs_write_begin,
4155 .write_end = cifs_write_end,
4156 .set_page_dirty = __set_page_dirty_nobuffers,
4157 .releasepage = cifs_release_page,
4158 .invalidatepage = cifs_invalidate_page,
4159 .launder_page = cifs_launder_page,
4160 };
CRIS linux kernel tree