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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
47static 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
55
56
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
65static 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
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
99static 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
113int 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_sb->mnt_cifs_flags &
144 CIFS_MOUNT_MAP_SPECIAL_CHR);
145 cifs_put_tlink(tlink);
146
147 if (rc)
148 goto posix_open_ret;
149
150 if (presp_data->Type == cpu_to_le32(-1))
151 goto posix_open_ret;
152
153 if (!pinode)
154 goto posix_open_ret;
155
156 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
157
158
159 if (*pinode == NULL) {
160 cifs_fill_uniqueid(sb, &fattr);
161 *pinode = cifs_iget(sb, &fattr);
162 if (!*pinode) {
163 rc = -ENOMEM;
164 goto posix_open_ret;
165 }
166 } else {
167 cifs_fattr_to_inode(*pinode, &fattr);
168 }
169
170posix_open_ret:
171 kfree(presp_data);
172 return rc;
173}
174
175static int
176cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
177 struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
178 struct cifs_fid *fid, unsigned int xid)
179{
180 int rc;
181 int desired_access;
182 int disposition;
183 int create_options = CREATE_NOT_DIR;
184 FILE_ALL_INFO *buf;
185 struct TCP_Server_Info *server = tcon->ses->server;
186 struct cifs_open_parms oparms;
187
188 if (!server->ops->open)
189 return -ENOSYS;
190
191 desired_access = cifs_convert_flags(f_flags);
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217 disposition = cifs_get_disposition(f_flags);
218
219
220
221 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
222 if (!buf)
223 return -ENOMEM;
224
225 if (backup_cred(cifs_sb))
226 create_options |= CREATE_OPEN_BACKUP_INTENT;
227
228 oparms.tcon = tcon;
229 oparms.cifs_sb = cifs_sb;
230 oparms.desired_access = desired_access;
231 oparms.create_options = create_options;
232 oparms.disposition = disposition;
233 oparms.path = full_path;
234 oparms.fid = fid;
235 oparms.reconnect = false;
236
237 rc = server->ops->open(xid, &oparms, oplock, buf);
238
239 if (rc)
240 goto out;
241
242 if (tcon->unix_ext)
243 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
244 xid);
245 else
246 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
247 xid, &fid->netfid);
248
249out:
250 kfree(buf);
251 return rc;
252}
253
254static bool
255cifs_has_mand_locks(struct cifsInodeInfo *cinode)
256{
257 struct cifs_fid_locks *cur;
258 bool has_locks = false;
259
260 down_read(&cinode->lock_sem);
261 list_for_each_entry(cur, &cinode->llist, llist) {
262 if (!list_empty(&cur->locks)) {
263 has_locks = true;
264 break;
265 }
266 }
267 up_read(&cinode->lock_sem);
268 return has_locks;
269}
270
271struct cifsFileInfo *
272cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
273 struct tcon_link *tlink, __u32 oplock)
274{
275 struct dentry *dentry = file->f_path.dentry;
276 struct inode *inode = dentry->d_inode;
277 struct cifsInodeInfo *cinode = CIFS_I(inode);
278 struct cifsFileInfo *cfile;
279 struct cifs_fid_locks *fdlocks;
280 struct cifs_tcon *tcon = tlink_tcon(tlink);
281 struct TCP_Server_Info *server = tcon->ses->server;
282
283 cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
284 if (cfile == NULL)
285 return cfile;
286
287 fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
288 if (!fdlocks) {
289 kfree(cfile);
290 return NULL;
291 }
292
293 INIT_LIST_HEAD(&fdlocks->locks);
294 fdlocks->cfile = cfile;
295 cfile->llist = fdlocks;
296 down_write(&cinode->lock_sem);
297 list_add(&fdlocks->llist, &cinode->llist);
298 up_write(&cinode->lock_sem);
299
300 cfile->count = 1;
301 cfile->pid = current->tgid;
302 cfile->uid = current_fsuid();
303 cfile->dentry = dget(dentry);
304 cfile->f_flags = file->f_flags;
305 cfile->invalidHandle = false;
306 cfile->tlink = cifs_get_tlink(tlink);
307 INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
308 mutex_init(&cfile->fh_mutex);
309
310 cifs_sb_active(inode->i_sb);
311
312
313
314
315
316 if (oplock == server->vals->oplock_read &&
317 cifs_has_mand_locks(cinode)) {
318 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
319 oplock = 0;
320 }
321
322 spin_lock(&cifs_file_list_lock);
323 if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
324 oplock = fid->pending_open->oplock;
325 list_del(&fid->pending_open->olist);
326
327 server->ops->set_fid(cfile, fid, oplock);
328
329 list_add(&cfile->tlist, &tcon->openFileList);
330
331 if (file->f_mode & FMODE_READ)
332 list_add(&cfile->flist, &cinode->openFileList);
333 else
334 list_add_tail(&cfile->flist, &cinode->openFileList);
335 spin_unlock(&cifs_file_list_lock);
336
337 file->private_data = cfile;
338 return cfile;
339}
340
341struct cifsFileInfo *
342cifsFileInfo_get(struct cifsFileInfo *cifs_file)
343{
344 spin_lock(&cifs_file_list_lock);
345 cifsFileInfo_get_locked(cifs_file);
346 spin_unlock(&cifs_file_list_lock);
347 return cifs_file;
348}
349
350
351
352
353
354
355void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
356{
357 struct inode *inode = cifs_file->dentry->d_inode;
358 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
359 struct TCP_Server_Info *server = tcon->ses->server;
360 struct cifsInodeInfo *cifsi = CIFS_I(inode);
361 struct super_block *sb = inode->i_sb;
362 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
363 struct cifsLockInfo *li, *tmp;
364 struct cifs_fid fid;
365 struct cifs_pending_open open;
366
367 spin_lock(&cifs_file_list_lock);
368 if (--cifs_file->count > 0) {
369 spin_unlock(&cifs_file_list_lock);
370 return;
371 }
372
373 if (server->ops->get_lease_key)
374 server->ops->get_lease_key(inode, &fid);
375
376
377 cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
378
379
380 list_del(&cifs_file->flist);
381 list_del(&cifs_file->tlist);
382
383 if (list_empty(&cifsi->openFileList)) {
384 cifs_dbg(FYI, "closing last open instance for inode %p\n",
385 cifs_file->dentry->d_inode);
386
387
388
389
390
391 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
392 CIFS_I(inode)->invalid_mapping = true;
393 cifs_set_oplock_level(cifsi, 0);
394 }
395 spin_unlock(&cifs_file_list_lock);
396
397 cancel_work_sync(&cifs_file->oplock_break);
398
399 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
400 struct TCP_Server_Info *server = tcon->ses->server;
401 unsigned int xid;
402
403 xid = get_xid();
404 if (server->ops->close)
405 server->ops->close(xid, tcon, &cifs_file->fid);
406 _free_xid(xid);
407 }
408
409 cifs_del_pending_open(&open);
410
411
412
413
414
415 down_write(&cifsi->lock_sem);
416 list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
417 list_del(&li->llist);
418 cifs_del_lock_waiters(li);
419 kfree(li);
420 }
421 list_del(&cifs_file->llist->llist);
422 kfree(cifs_file->llist);
423 up_write(&cifsi->lock_sem);
424
425 cifs_put_tlink(cifs_file->tlink);
426 dput(cifs_file->dentry);
427 cifs_sb_deactive(sb);
428 kfree(cifs_file);
429}
430
431int cifs_open(struct inode *inode, struct file *file)
432
433{
434 int rc = -EACCES;
435 unsigned int xid;
436 __u32 oplock;
437 struct cifs_sb_info *cifs_sb;
438 struct TCP_Server_Info *server;
439 struct cifs_tcon *tcon;
440 struct tcon_link *tlink;
441 struct cifsFileInfo *cfile = NULL;
442 char *full_path = NULL;
443 bool posix_open_ok = false;
444 struct cifs_fid fid;
445 struct cifs_pending_open open;
446
447 xid = get_xid();
448
449 cifs_sb = CIFS_SB(inode->i_sb);
450 tlink = cifs_sb_tlink(cifs_sb);
451 if (IS_ERR(tlink)) {
452 free_xid(xid);
453 return PTR_ERR(tlink);
454 }
455 tcon = tlink_tcon(tlink);
456 server = tcon->ses->server;
457
458 full_path = build_path_from_dentry(file->f_path.dentry);
459 if (full_path == NULL) {
460 rc = -ENOMEM;
461 goto out;
462 }
463
464 cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
465 inode, file->f_flags, full_path);
466
467 if (server->oplocks)
468 oplock = REQ_OPLOCK;
469 else
470 oplock = 0;
471
472 if (!tcon->broken_posix_open && tcon->unix_ext &&
473 cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
474 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
475
476 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
477 cifs_sb->mnt_file_mode ,
478 file->f_flags, &oplock, &fid.netfid, xid);
479 if (rc == 0) {
480 cifs_dbg(FYI, "posix open succeeded\n");
481 posix_open_ok = true;
482 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
483 if (tcon->ses->serverNOS)
484 cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n",
485 tcon->ses->serverName,
486 tcon->ses->serverNOS);
487 tcon->broken_posix_open = true;
488 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
489 (rc != -EOPNOTSUPP))
490 goto out;
491
492
493
494
495 }
496
497 if (server->ops->get_lease_key)
498 server->ops->get_lease_key(inode, &fid);
499
500 cifs_add_pending_open(&fid, tlink, &open);
501
502 if (!posix_open_ok) {
503 if (server->ops->get_lease_key)
504 server->ops->get_lease_key(inode, &fid);
505
506 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
507 file->f_flags, &oplock, &fid, xid);
508 if (rc) {
509 cifs_del_pending_open(&open);
510 goto out;
511 }
512 }
513
514 cfile = cifs_new_fileinfo(&fid, file, tlink, oplock);
515 if (cfile == NULL) {
516 if (server->ops->close)
517 server->ops->close(xid, tcon, &fid);
518 cifs_del_pending_open(&open);
519 rc = -ENOMEM;
520 goto out;
521 }
522
523 cifs_fscache_set_inode_cookie(inode, file);
524
525 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
526
527
528
529
530 struct cifs_unix_set_info_args args = {
531 .mode = inode->i_mode,
532 .uid = INVALID_UID,
533 .gid = INVALID_GID,
534 .ctime = NO_CHANGE_64,
535 .atime = NO_CHANGE_64,
536 .mtime = NO_CHANGE_64,
537 .device = 0,
538 };
539 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
540 cfile->pid);
541 }
542
543out:
544 kfree(full_path);
545 free_xid(xid);
546 cifs_put_tlink(tlink);
547 return rc;
548}
549
550static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
551
552
553
554
555
556static int
557cifs_relock_file(struct cifsFileInfo *cfile)
558{
559 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
560 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
561 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
562 int rc = 0;
563
564 down_read(&cinode->lock_sem);
565 if (cinode->can_cache_brlcks) {
566
567 up_read(&cinode->lock_sem);
568 return rc;
569 }
570
571 if (cap_unix(tcon->ses) &&
572 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
573 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
574 rc = cifs_push_posix_locks(cfile);
575 else
576 rc = tcon->ses->server->ops->push_mand_locks(cfile);
577
578 up_read(&cinode->lock_sem);
579 return rc;
580}
581
582static int
583cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
584{
585 int rc = -EACCES;
586 unsigned int xid;
587 __u32 oplock;
588 struct cifs_sb_info *cifs_sb;
589 struct cifs_tcon *tcon;
590 struct TCP_Server_Info *server;
591 struct cifsInodeInfo *cinode;
592 struct inode *inode;
593 char *full_path = NULL;
594 int desired_access;
595 int disposition = FILE_OPEN;
596 int create_options = CREATE_NOT_DIR;
597 struct cifs_open_parms oparms;
598
599 xid = get_xid();
600 mutex_lock(&cfile->fh_mutex);
601 if (!cfile->invalidHandle) {
602 mutex_unlock(&cfile->fh_mutex);
603 rc = 0;
604 free_xid(xid);
605 return rc;
606 }
607
608 inode = cfile->dentry->d_inode;
609 cifs_sb = CIFS_SB(inode->i_sb);
610 tcon = tlink_tcon(cfile->tlink);
611 server = tcon->ses->server;
612
613
614
615
616
617
618
619 full_path = build_path_from_dentry(cfile->dentry);
620 if (full_path == NULL) {
621 rc = -ENOMEM;
622 mutex_unlock(&cfile->fh_mutex);
623 free_xid(xid);
624 return rc;
625 }
626
627 cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
628 inode, cfile->f_flags, full_path);
629
630 if (tcon->ses->server->oplocks)
631 oplock = REQ_OPLOCK;
632 else
633 oplock = 0;
634
635 if (tcon->unix_ext && cap_unix(tcon->ses) &&
636 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
637 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
638
639
640
641
642 unsigned int oflags = cfile->f_flags &
643 ~(O_CREAT | O_EXCL | O_TRUNC);
644
645 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
646 cifs_sb->mnt_file_mode ,
647 oflags, &oplock, &cfile->fid.netfid, xid);
648 if (rc == 0) {
649 cifs_dbg(FYI, "posix reopen succeeded\n");
650 oparms.reconnect = true;
651 goto reopen_success;
652 }
653
654
655
656
657 }
658
659 desired_access = cifs_convert_flags(cfile->f_flags);
660
661 if (backup_cred(cifs_sb))
662 create_options |= CREATE_OPEN_BACKUP_INTENT;
663
664 if (server->ops->get_lease_key)
665 server->ops->get_lease_key(inode, &cfile->fid);
666
667 oparms.tcon = tcon;
668 oparms.cifs_sb = cifs_sb;
669 oparms.desired_access = desired_access;
670 oparms.create_options = create_options;
671 oparms.disposition = disposition;
672 oparms.path = full_path;
673 oparms.fid = &cfile->fid;
674 oparms.reconnect = true;
675
676
677
678
679
680
681
682
683 rc = server->ops->open(xid, &oparms, &oplock, NULL);
684 if (rc == -ENOENT && oparms.reconnect == false) {
685
686 rc = server->ops->open(xid, &oparms, &oplock, NULL);
687
688 oparms.reconnect = true;
689 }
690
691 if (rc) {
692 mutex_unlock(&cfile->fh_mutex);
693 cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
694 cifs_dbg(FYI, "oplock: %d\n", oplock);
695 goto reopen_error_exit;
696 }
697
698reopen_success:
699 cfile->invalidHandle = false;
700 mutex_unlock(&cfile->fh_mutex);
701 cinode = CIFS_I(inode);
702
703 if (can_flush) {
704 rc = filemap_write_and_wait(inode->i_mapping);
705 mapping_set_error(inode->i_mapping, rc);
706
707 if (tcon->unix_ext)
708 rc = cifs_get_inode_info_unix(&inode, full_path,
709 inode->i_sb, xid);
710 else
711 rc = cifs_get_inode_info(&inode, full_path, NULL,
712 inode->i_sb, xid, NULL);
713 }
714
715
716
717
718
719
720
721 server->ops->set_fid(cfile, &cfile->fid, oplock);
722 if (oparms.reconnect)
723 cifs_relock_file(cfile);
724
725reopen_error_exit:
726 kfree(full_path);
727 free_xid(xid);
728 return rc;
729}
730
731int cifs_close(struct inode *inode, struct file *file)
732{
733 if (file->private_data != NULL) {
734 cifsFileInfo_put(file->private_data);
735 file->private_data = NULL;
736 }
737
738
739 return 0;
740}
741
742int cifs_closedir(struct inode *inode, struct file *file)
743{
744 int rc = 0;
745 unsigned int xid;
746 struct cifsFileInfo *cfile = file->private_data;
747 struct cifs_tcon *tcon;
748 struct TCP_Server_Info *server;
749 char *buf;
750
751 cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode);
752
753 if (cfile == NULL)
754 return rc;
755
756 xid = get_xid();
757 tcon = tlink_tcon(cfile->tlink);
758 server = tcon->ses->server;
759
760 cifs_dbg(FYI, "Freeing private data in close dir\n");
761 spin_lock(&cifs_file_list_lock);
762 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
763 cfile->invalidHandle = true;
764 spin_unlock(&cifs_file_list_lock);
765 if (server->ops->close_dir)
766 rc = server->ops->close_dir(xid, tcon, &cfile->fid);
767 else
768 rc = -ENOSYS;
769 cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc);
770
771 rc = 0;
772 } else
773 spin_unlock(&cifs_file_list_lock);
774
775 buf = cfile->srch_inf.ntwrk_buf_start;
776 if (buf) {
777 cifs_dbg(FYI, "closedir free smb buf in srch struct\n");
778 cfile->srch_inf.ntwrk_buf_start = NULL;
779 if (cfile->srch_inf.smallBuf)
780 cifs_small_buf_release(buf);
781 else
782 cifs_buf_release(buf);
783 }
784
785 cifs_put_tlink(cfile->tlink);
786 kfree(file->private_data);
787 file->private_data = NULL;
788
789 free_xid(xid);
790 return rc;
791}
792
793static struct cifsLockInfo *
794cifs_lock_init(__u64 offset, __u64 length, __u8 type)
795{
796 struct cifsLockInfo *lock =
797 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
798 if (!lock)
799 return lock;
800 lock->offset = offset;
801 lock->length = length;
802 lock->type = type;
803 lock->pid = current->tgid;
804 INIT_LIST_HEAD(&lock->blist);
805 init_waitqueue_head(&lock->block_q);
806 return lock;
807}
808
809void
810cifs_del_lock_waiters(struct cifsLockInfo *lock)
811{
812 struct cifsLockInfo *li, *tmp;
813 list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
814 list_del_init(&li->blist);
815 wake_up(&li->block_q);
816 }
817}
818
819#define CIFS_LOCK_OP 0
820#define CIFS_READ_OP 1
821#define CIFS_WRITE_OP 2
822
823
824static bool
825cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
826 __u64 length, __u8 type, struct cifsFileInfo *cfile,
827 struct cifsLockInfo **conf_lock, int rw_check)
828{
829 struct cifsLockInfo *li;
830 struct cifsFileInfo *cur_cfile = fdlocks->cfile;
831 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
832
833 list_for_each_entry(li, &fdlocks->locks, llist) {
834 if (offset + length <= li->offset ||
835 offset >= li->offset + li->length)
836 continue;
837 if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
838 server->ops->compare_fids(cfile, cur_cfile)) {
839
840 if (!(li->type & server->vals->shared_lock_type) ||
841 rw_check != CIFS_WRITE_OP)
842 continue;
843 }
844 if ((type & server->vals->shared_lock_type) &&
845 ((server->ops->compare_fids(cfile, cur_cfile) &&
846 current->tgid == li->pid) || type == li->type))
847 continue;
848 if (conf_lock)
849 *conf_lock = li;
850 return true;
851 }
852 return false;
853}
854
855bool
856cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
857 __u8 type, struct cifsLockInfo **conf_lock,
858 int rw_check)
859{
860 bool rc = false;
861 struct cifs_fid_locks *cur;
862 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
863
864 list_for_each_entry(cur, &cinode->llist, llist) {
865 rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
866 cfile, conf_lock, rw_check);
867 if (rc)
868 break;
869 }
870
871 return rc;
872}
873
874
875
876
877
878
879
880
881static int
882cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
883 __u8 type, struct file_lock *flock)
884{
885 int rc = 0;
886 struct cifsLockInfo *conf_lock;
887 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
888 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
889 bool exist;
890
891 down_read(&cinode->lock_sem);
892
893 exist = cifs_find_lock_conflict(cfile, offset, length, type,
894 &conf_lock, CIFS_LOCK_OP);
895 if (exist) {
896 flock->fl_start = conf_lock->offset;
897 flock->fl_end = conf_lock->offset + conf_lock->length - 1;
898 flock->fl_pid = conf_lock->pid;
899 if (conf_lock->type & server->vals->shared_lock_type)
900 flock->fl_type = F_RDLCK;
901 else
902 flock->fl_type = F_WRLCK;
903 } else if (!cinode->can_cache_brlcks)
904 rc = 1;
905 else
906 flock->fl_type = F_UNLCK;
907
908 up_read(&cinode->lock_sem);
909 return rc;
910}
911
912static void
913cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
914{
915 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
916 down_write(&cinode->lock_sem);
917 list_add_tail(&lock->llist, &cfile->llist->locks);
918 up_write(&cinode->lock_sem);
919}
920
921
922
923
924
925
926
927static int
928cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
929 bool wait)
930{
931 struct cifsLockInfo *conf_lock;
932 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
933 bool exist;
934 int rc = 0;
935
936try_again:
937 exist = false;
938 down_write(&cinode->lock_sem);
939
940 exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
941 lock->type, &conf_lock, CIFS_LOCK_OP);
942 if (!exist && cinode->can_cache_brlcks) {
943 list_add_tail(&lock->llist, &cfile->llist->locks);
944 up_write(&cinode->lock_sem);
945 return rc;
946 }
947
948 if (!exist)
949 rc = 1;
950 else if (!wait)
951 rc = -EACCES;
952 else {
953 list_add_tail(&lock->blist, &conf_lock->blist);
954 up_write(&cinode->lock_sem);
955 rc = wait_event_interruptible(lock->block_q,
956 (lock->blist.prev == &lock->blist) &&
957 (lock->blist.next == &lock->blist));
958 if (!rc)
959 goto try_again;
960 down_write(&cinode->lock_sem);
961 list_del_init(&lock->blist);
962 }
963
964 up_write(&cinode->lock_sem);
965 return rc;
966}
967
968
969
970
971
972
973
974
975static int
976cifs_posix_lock_test(struct file *file, struct file_lock *flock)
977{
978 int rc = 0;
979 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
980 unsigned char saved_type = flock->fl_type;
981
982 if ((flock->fl_flags & FL_POSIX) == 0)
983 return 1;
984
985 down_read(&cinode->lock_sem);
986 posix_test_lock(file, flock);
987
988 if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
989 flock->fl_type = saved_type;
990 rc = 1;
991 }
992
993 up_read(&cinode->lock_sem);
994 return rc;
995}
996
997
998
999
1000
1001
1002
1003static int
1004cifs_posix_lock_set(struct file *file, struct file_lock *flock)
1005{
1006 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
1007 int rc = 1;
1008
1009 if ((flock->fl_flags & FL_POSIX) == 0)
1010 return rc;
1011
1012try_again:
1013 down_write(&cinode->lock_sem);
1014 if (!cinode->can_cache_brlcks) {
1015 up_write(&cinode->lock_sem);
1016 return rc;
1017 }
1018
1019 rc = posix_lock_file(file, flock, NULL);
1020 up_write(&cinode->lock_sem);
1021 if (rc == FILE_LOCK_DEFERRED) {
1022 rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next);
1023 if (!rc)
1024 goto try_again;
1025 posix_unblock_lock(flock);
1026 }
1027 return rc;
1028}
1029
1030int
1031cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
1032{
1033 unsigned int xid;
1034 int rc = 0, stored_rc;
1035 struct cifsLockInfo *li, *tmp;
1036 struct cifs_tcon *tcon;
1037 unsigned int num, max_num, max_buf;
1038 LOCKING_ANDX_RANGE *buf, *cur;
1039 int types[] = {LOCKING_ANDX_LARGE_FILES,
1040 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1041 int i;
1042
1043 xid = get_xid();
1044 tcon = tlink_tcon(cfile->tlink);
1045
1046
1047
1048
1049
1050 max_buf = tcon->ses->server->maxBuf;
1051 if (!max_buf) {
1052 free_xid(xid);
1053 return -EINVAL;
1054 }
1055
1056 max_num = (max_buf - sizeof(struct smb_hdr)) /
1057 sizeof(LOCKING_ANDX_RANGE);
1058 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1059 if (!buf) {
1060 free_xid(xid);
1061 return -ENOMEM;
1062 }
1063
1064 for (i = 0; i < 2; i++) {
1065 cur = buf;
1066 num = 0;
1067 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1068 if (li->type != types[i])
1069 continue;
1070 cur->Pid = cpu_to_le16(li->pid);
1071 cur->LengthLow = cpu_to_le32((u32)li->length);
1072 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1073 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1074 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1075 if (++num == max_num) {
1076 stored_rc = cifs_lockv(xid, tcon,
1077 cfile->fid.netfid,
1078 (__u8)li->type, 0, num,
1079 buf);
1080 if (stored_rc)
1081 rc = stored_rc;
1082 cur = buf;
1083 num = 0;
1084 } else
1085 cur++;
1086 }
1087
1088 if (num) {
1089 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1090 (__u8)types[i], 0, num, buf);
1091 if (stored_rc)
1092 rc = stored_rc;
1093 }
1094 }
1095
1096 kfree(buf);
1097 free_xid(xid);
1098 return rc;
1099}
1100
1101
1102#define cifs_for_each_lock(inode, lockp) \
1103 for (lockp = &inode->i_flock; *lockp != NULL; \
1104 lockp = &(*lockp)->fl_next)
1105
1106struct lock_to_push {
1107 struct list_head llist;
1108 __u64 offset;
1109 __u64 length;
1110 __u32 pid;
1111 __u16 netfid;
1112 __u8 type;
1113};
1114
1115static int
1116cifs_push_posix_locks(struct cifsFileInfo *cfile)
1117{
1118 struct inode *inode = cfile->dentry->d_inode;
1119 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1120 struct file_lock *flock, **before;
1121 unsigned int count = 0, i = 0;
1122 int rc = 0, xid, type;
1123 struct list_head locks_to_send, *el;
1124 struct lock_to_push *lck, *tmp;
1125 __u64 length;
1126
1127 xid = get_xid();
1128
1129 spin_lock(&inode->i_lock);
1130 cifs_for_each_lock(inode, before) {
1131 if ((*before)->fl_flags & FL_POSIX)
1132 count++;
1133 }
1134 spin_unlock(&inode->i_lock);
1135
1136 INIT_LIST_HEAD(&locks_to_send);
1137
1138
1139
1140
1141
1142
1143 for (; i < count; i++) {
1144 lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
1145 if (!lck) {
1146 rc = -ENOMEM;
1147 goto err_out;
1148 }
1149 list_add_tail(&lck->llist, &locks_to_send);
1150 }
1151
1152 el = locks_to_send.next;
1153 spin_lock(&inode->i_lock);
1154 cifs_for_each_lock(inode, before) {
1155 flock = *before;
1156 if ((flock->fl_flags & FL_POSIX) == 0)
1157 continue;
1158 if (el == &locks_to_send) {
1159
1160
1161
1162
1163 cifs_dbg(VFS, "Can't push all brlocks!\n");
1164 break;
1165 }
1166 length = 1 + flock->fl_end - flock->fl_start;
1167 if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
1168 type = CIFS_RDLCK;
1169 else
1170 type = CIFS_WRLCK;
1171 lck = list_entry(el, struct lock_to_push, llist);
1172 lck->pid = flock->fl_pid;
1173 lck->netfid = cfile->fid.netfid;
1174 lck->length = length;
1175 lck->type = type;
1176 lck->offset = flock->fl_start;
1177 el = el->next;
1178 }
1179 spin_unlock(&inode->i_lock);
1180
1181 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1182 int stored_rc;
1183
1184 stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
1185 lck->offset, lck->length, NULL,
1186 lck->type, 0);
1187 if (stored_rc)
1188 rc = stored_rc;
1189 list_del(&lck->llist);
1190 kfree(lck);
1191 }
1192
1193out:
1194 free_xid(xid);
1195 return rc;
1196err_out:
1197 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1198 list_del(&lck->llist);
1199 kfree(lck);
1200 }
1201 goto out;
1202}
1203
1204static int
1205cifs_push_locks(struct cifsFileInfo *cfile)
1206{
1207 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
1208 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
1209 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1210 int rc = 0;
1211
1212
1213 down_write(&cinode->lock_sem);
1214 if (!cinode->can_cache_brlcks) {
1215 up_write(&cinode->lock_sem);
1216 return rc;
1217 }
1218
1219 if (cap_unix(tcon->ses) &&
1220 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1221 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1222 rc = cifs_push_posix_locks(cfile);
1223 else
1224 rc = tcon->ses->server->ops->push_mand_locks(cfile);
1225
1226 cinode->can_cache_brlcks = false;
1227 up_write(&cinode->lock_sem);
1228 return rc;
1229}
1230
1231static void
1232cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
1233 bool *wait_flag, struct TCP_Server_Info *server)
1234{
1235 if (flock->fl_flags & FL_POSIX)
1236 cifs_dbg(FYI, "Posix\n");
1237 if (flock->fl_flags & FL_FLOCK)
1238 cifs_dbg(FYI, "Flock\n");
1239 if (flock->fl_flags & FL_SLEEP) {
1240 cifs_dbg(FYI, "Blocking lock\n");
1241 *wait_flag = true;
1242 }
1243 if (flock->fl_flags & FL_ACCESS)
1244 cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n");
1245 if (flock->fl_flags & FL_LEASE)
1246 cifs_dbg(FYI, "Lease on file - not implemented yet\n");
1247 if (flock->fl_flags &
1248 (~(FL_POSIX | FL_FLOCK | FL_SLEEP |
1249 FL_ACCESS | FL_LEASE | FL_CLOSE)))
1250 cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags);
1251
1252 *type = server->vals->large_lock_type;
1253 if (flock->fl_type == F_WRLCK) {
1254 cifs_dbg(FYI, "F_WRLCK\n");
1255 *type |= server->vals->exclusive_lock_type;
1256 *lock = 1;
1257 } else if (flock->fl_type == F_UNLCK) {
1258 cifs_dbg(FYI, "F_UNLCK\n");
1259 *type |= server->vals->unlock_lock_type;
1260 *unlock = 1;
1261
1262 } else if (flock->fl_type == F_RDLCK) {
1263 cifs_dbg(FYI, "F_RDLCK\n");
1264 *type |= server->vals->shared_lock_type;
1265 *lock = 1;
1266 } else if (flock->fl_type == F_EXLCK) {
1267 cifs_dbg(FYI, "F_EXLCK\n");
1268 *type |= server->vals->exclusive_lock_type;
1269 *lock = 1;
1270 } else if (flock->fl_type == F_SHLCK) {
1271 cifs_dbg(FYI, "F_SHLCK\n");
1272 *type |= server->vals->shared_lock_type;
1273 *lock = 1;
1274 } else
1275 cifs_dbg(FYI, "Unknown type of lock\n");
1276}
1277
1278static int
1279cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
1280 bool wait_flag, bool posix_lck, unsigned int xid)
1281{
1282 int rc = 0;
1283 __u64 length = 1 + flock->fl_end - flock->fl_start;
1284 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1285 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1286 struct TCP_Server_Info *server = tcon->ses->server;
1287 __u16 netfid = cfile->fid.netfid;
1288
1289 if (posix_lck) {
1290 int posix_lock_type;
1291
1292 rc = cifs_posix_lock_test(file, flock);
1293 if (!rc)
1294 return rc;
1295
1296 if (type & server->vals->shared_lock_type)
1297 posix_lock_type = CIFS_RDLCK;
1298 else
1299 posix_lock_type = CIFS_WRLCK;
1300 rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
1301 flock->fl_start, length, flock,
1302 posix_lock_type, wait_flag);
1303 return rc;
1304 }
1305
1306 rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
1307 if (!rc)
1308 return rc;
1309
1310
1311 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type,
1312 1, 0, false);
1313 if (rc == 0) {
1314 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1315 type, 0, 1, false);
1316 flock->fl_type = F_UNLCK;
1317 if (rc != 0)
1318 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1319 rc);
1320 return 0;
1321 }
1322
1323 if (type & server->vals->shared_lock_type) {
1324 flock->fl_type = F_WRLCK;
1325 return 0;
1326 }
1327
1328 type &= ~server->vals->exclusive_lock_type;
1329
1330 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1331 type | server->vals->shared_lock_type,
1332 1, 0, false);
1333 if (rc == 0) {
1334 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1335 type | server->vals->shared_lock_type, 0, 1, false);
1336 flock->fl_type = F_RDLCK;
1337 if (rc != 0)
1338 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1339 rc);
1340 } else
1341 flock->fl_type = F_WRLCK;
1342
1343 return 0;
1344}
1345
1346void
1347cifs_move_llist(struct list_head *source, struct list_head *dest)
1348{
1349 struct list_head *li, *tmp;
1350 list_for_each_safe(li, tmp, source)
1351 list_move(li, dest);
1352}
1353
1354void
1355cifs_free_llist(struct list_head *llist)
1356{
1357 struct cifsLockInfo *li, *tmp;
1358 list_for_each_entry_safe(li, tmp, llist, llist) {
1359 cifs_del_lock_waiters(li);
1360 list_del(&li->llist);
1361 kfree(li);
1362 }
1363}
1364
1365int
1366cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
1367 unsigned int xid)
1368{
1369 int rc = 0, stored_rc;
1370 int types[] = {LOCKING_ANDX_LARGE_FILES,
1371 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1372 unsigned int i;
1373 unsigned int max_num, num, max_buf;
1374 LOCKING_ANDX_RANGE *buf, *cur;
1375 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1376 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
1377 struct cifsLockInfo *li, *tmp;
1378 __u64 length = 1 + flock->fl_end - flock->fl_start;
1379 struct list_head tmp_llist;
1380
1381 INIT_LIST_HEAD(&tmp_llist);
1382
1383
1384
1385
1386
1387 max_buf = tcon->ses->server->maxBuf;
1388 if (!max_buf)
1389 return -EINVAL;
1390
1391 max_num = (max_buf - sizeof(struct smb_hdr)) /
1392 sizeof(LOCKING_ANDX_RANGE);
1393 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1394 if (!buf)
1395 return -ENOMEM;
1396
1397 down_write(&cinode->lock_sem);
1398 for (i = 0; i < 2; i++) {
1399 cur = buf;
1400 num = 0;
1401 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1402 if (flock->fl_start > li->offset ||
1403 (flock->fl_start + length) <
1404 (li->offset + li->length))
1405 continue;
1406 if (current->tgid != li->pid)
1407 continue;
1408 if (types[i] != li->type)
1409 continue;
1410 if (cinode->can_cache_brlcks) {
1411
1412
1413
1414
1415 list_del(&li->llist);
1416 cifs_del_lock_waiters(li);
1417 kfree(li);
1418 continue;
1419 }
1420 cur->Pid = cpu_to_le16(li->pid);
1421 cur->LengthLow = cpu_to_le32((u32)li->length);
1422 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1423 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1424 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1425
1426
1427
1428
1429
1430 list_move(&li->llist, &tmp_llist);
1431 if (++num == max_num) {
1432 stored_rc = cifs_lockv(xid, tcon,
1433 cfile->fid.netfid,
1434 li->type, num, 0, buf);
1435 if (stored_rc) {
1436
1437
1438
1439
1440
1441 cifs_move_llist(&tmp_llist,
1442 &cfile->llist->locks);
1443 rc = stored_rc;
1444 } else
1445
1446
1447
1448
1449 cifs_free_llist(&tmp_llist);
1450 cur = buf;
1451 num = 0;
1452 } else
1453 cur++;
1454 }
1455 if (num) {
1456 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1457 types[i], num, 0, buf);
1458 if (stored_rc) {
1459 cifs_move_llist(&tmp_llist,
1460 &cfile->llist->locks);
1461 rc = stored_rc;
1462 } else
1463 cifs_free_llist(&tmp_llist);
1464 }
1465 }
1466
1467 up_write(&cinode->lock_sem);
1468 kfree(buf);
1469 return rc;
1470}
1471
1472static int
1473cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
1474 bool wait_flag, bool posix_lck, int lock, int unlock,
1475 unsigned int xid)
1476{
1477 int rc = 0;
1478 __u64 length = 1 + flock->fl_end - flock->fl_start;
1479 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1480 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1481 struct TCP_Server_Info *server = tcon->ses->server;
1482 struct inode *inode = cfile->dentry->d_inode;
1483
1484 if (posix_lck) {
1485 int posix_lock_type;
1486
1487 rc = cifs_posix_lock_set(file, flock);
1488 if (!rc || rc < 0)
1489 return rc;
1490
1491 if (type & server->vals->shared_lock_type)
1492 posix_lock_type = CIFS_RDLCK;
1493 else
1494 posix_lock_type = CIFS_WRLCK;
1495
1496 if (unlock == 1)
1497 posix_lock_type = CIFS_UNLCK;
1498
1499 rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
1500 current->tgid, flock->fl_start, length,
1501 NULL, posix_lock_type, wait_flag);
1502 goto out;
1503 }
1504
1505 if (lock) {
1506 struct cifsLockInfo *lock;
1507
1508 lock = cifs_lock_init(flock->fl_start, length, type);
1509 if (!lock)
1510 return -ENOMEM;
1511
1512 rc = cifs_lock_add_if(cfile, lock, wait_flag);
1513 if (rc < 0) {
1514 kfree(lock);
1515 return rc;
1516 }
1517 if (!rc)
1518 goto out;
1519
1520
1521
1522
1523
1524
1525
1526
1527 if (!CIFS_I(inode)->clientCanCacheAll &&
1528 CIFS_I(inode)->clientCanCacheRead) {
1529 cifs_invalidate_mapping(inode);
1530 cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n",
1531 inode);
1532 CIFS_I(inode)->clientCanCacheRead = false;
1533 }
1534
1535 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1536 type, 1, 0, wait_flag);
1537 if (rc) {
1538 kfree(lock);
1539 return rc;
1540 }
1541
1542 cifs_lock_add(cfile, lock);
1543 } else if (unlock)
1544 rc = server->ops->mand_unlock_range(cfile, flock, xid);
1545
1546out:
1547 if (flock->fl_flags & FL_POSIX)
1548 posix_lock_file_wait(file, flock);
1549 return rc;
1550}
1551
1552int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
1553{
1554 int rc, xid;
1555 int lock = 0, unlock = 0;
1556 bool wait_flag = false;
1557 bool posix_lck = false;
1558 struct cifs_sb_info *cifs_sb;
1559 struct cifs_tcon *tcon;
1560 struct cifsInodeInfo *cinode;
1561 struct cifsFileInfo *cfile;
1562 __u16 netfid;
1563 __u32 type;
1564
1565 rc = -EACCES;
1566 xid = get_xid();
1567
1568 cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n",
1569 cmd, flock->fl_flags, flock->fl_type,
1570 flock->fl_start, flock->fl_end);
1571
1572 cfile = (struct cifsFileInfo *)file->private_data;
1573 tcon = tlink_tcon(cfile->tlink);
1574
1575 cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
1576 tcon->ses->server);
1577
1578 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1579 netfid = cfile->fid.netfid;
1580 cinode = CIFS_I(file_inode(file));
1581
1582 if (cap_unix(tcon->ses) &&
1583 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1584 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1585 posix_lck = true;
1586
1587
1588
1589
1590 if (IS_GETLK(cmd)) {
1591 rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
1592 free_xid(xid);
1593 return rc;
1594 }
1595
1596 if (!lock && !unlock) {
1597
1598
1599
1600
1601 free_xid(xid);
1602 return -EOPNOTSUPP;
1603 }
1604
1605 rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
1606 xid);
1607 free_xid(xid);
1608 return rc;
1609}
1610
1611
1612
1613
1614
1615void
1616cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
1617 unsigned int bytes_written)
1618{
1619 loff_t end_of_write = offset + bytes_written;
1620
1621 if (end_of_write > cifsi->server_eof)
1622 cifsi->server_eof = end_of_write;
1623}
1624
1625static ssize_t
1626cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data,
1627 size_t write_size, loff_t *offset)
1628{
1629 int rc = 0;
1630 unsigned int bytes_written = 0;
1631 unsigned int total_written;
1632 struct cifs_sb_info *cifs_sb;
1633 struct cifs_tcon *tcon;
1634 struct TCP_Server_Info *server;
1635 unsigned int xid;
1636 struct dentry *dentry = open_file->dentry;
1637 struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
1638 struct cifs_io_parms io_parms;
1639
1640 cifs_sb = CIFS_SB(dentry->d_sb);
1641
1642 cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n",
1643 write_size, *offset, dentry->d_name.name);
1644
1645 tcon = tlink_tcon(open_file->tlink);
1646 server = tcon->ses->server;
1647
1648 if (!server->ops->sync_write)
1649 return -ENOSYS;
1650
1651 xid = get_xid();
1652
1653 for (total_written = 0; write_size > total_written;
1654 total_written += bytes_written) {
1655 rc = -EAGAIN;
1656 while (rc == -EAGAIN) {
1657 struct kvec iov[2];
1658 unsigned int len;
1659
1660 if (open_file->invalidHandle) {
1661
1662
1663
1664
1665 rc = cifs_reopen_file(open_file, false);
1666 if (rc != 0)
1667 break;
1668 }
1669
1670 len = min((size_t)cifs_sb->wsize,
1671 write_size - total_written);
1672
1673 iov[1].iov_base = (char *)write_data + total_written;
1674 iov[1].iov_len = len;
1675 io_parms.pid = pid;
1676 io_parms.tcon = tcon;
1677 io_parms.offset = *offset;
1678 io_parms.length = len;
1679 rc = server->ops->sync_write(xid, open_file, &io_parms,
1680 &bytes_written, iov, 1);
1681 }
1682 if (rc || (bytes_written == 0)) {
1683 if (total_written)
1684 break;
1685 else {
1686 free_xid(xid);
1687 return rc;
1688 }
1689 } else {
1690 spin_lock(&dentry->d_inode->i_lock);
1691 cifs_update_eof(cifsi, *offset, bytes_written);
1692 spin_unlock(&dentry->d_inode->i_lock);
1693 *offset += bytes_written;
1694 }
1695 }
1696
1697 cifs_stats_bytes_written(tcon, total_written);
1698
1699 if (total_written > 0) {
1700 spin_lock(&dentry->d_inode->i_lock);
1701 if (*offset > dentry->d_inode->i_size)
1702 i_size_write(dentry->d_inode, *offset);
1703 spin_unlock(&dentry->d_inode->i_lock);
1704 }
1705 mark_inode_dirty_sync(dentry->d_inode);
1706 free_xid(xid);
1707 return total_written;
1708}
1709
1710struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1711 bool fsuid_only)
1712{
1713 struct cifsFileInfo *open_file = NULL;
1714 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1715
1716
1717 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1718 fsuid_only = false;
1719
1720 spin_lock(&cifs_file_list_lock);
1721
1722
1723
1724 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1725 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1726 continue;
1727 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1728 if (!open_file->invalidHandle) {
1729
1730
1731 cifsFileInfo_get_locked(open_file);
1732 spin_unlock(&cifs_file_list_lock);
1733 return open_file;
1734 }
1735
1736
1737 } else
1738 break;
1739 }
1740 spin_unlock(&cifs_file_list_lock);
1741 return NULL;
1742}
1743
1744struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1745 bool fsuid_only)
1746{
1747 struct cifsFileInfo *open_file, *inv_file = NULL;
1748 struct cifs_sb_info *cifs_sb;
1749 bool any_available = false;
1750 int rc;
1751 unsigned int refind = 0;
1752
1753
1754
1755
1756
1757 if (cifs_inode == NULL) {
1758 cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
1759 dump_stack();
1760 return NULL;
1761 }
1762
1763 cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1764
1765
1766 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1767 fsuid_only = false;
1768
1769 spin_lock(&cifs_file_list_lock);
1770refind_writable:
1771 if (refind > MAX_REOPEN_ATT) {
1772 spin_unlock(&cifs_file_list_lock);
1773 return NULL;
1774 }
1775 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1776 if (!any_available && open_file->pid != current->tgid)
1777 continue;
1778 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1779 continue;
1780 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1781 if (!open_file->invalidHandle) {
1782
1783 cifsFileInfo_get_locked(open_file);
1784 spin_unlock(&cifs_file_list_lock);
1785 return open_file;
1786 } else {
1787 if (!inv_file)
1788 inv_file = open_file;
1789 }
1790 }
1791 }
1792
1793 if (!any_available) {
1794 any_available = true;
1795 goto refind_writable;
1796 }
1797
1798 if (inv_file) {
1799 any_available = false;
1800 cifsFileInfo_get_locked(inv_file);
1801 }
1802
1803 spin_unlock(&cifs_file_list_lock);
1804
1805 if (inv_file) {
1806 rc = cifs_reopen_file(inv_file, false);
1807 if (!rc)
1808 return inv_file;
1809 else {
1810 spin_lock(&cifs_file_list_lock);
1811 list_move_tail(&inv_file->flist,
1812 &cifs_inode->openFileList);
1813 spin_unlock(&cifs_file_list_lock);
1814 cifsFileInfo_put(inv_file);
1815 spin_lock(&cifs_file_list_lock);
1816 ++refind;
1817 goto refind_writable;
1818 }
1819 }
1820
1821 return NULL;
1822}
1823
1824static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1825{
1826 struct address_space *mapping = page->mapping;
1827 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1828 char *write_data;
1829 int rc = -EFAULT;
1830 int bytes_written = 0;
1831 struct inode *inode;
1832 struct cifsFileInfo *open_file;
1833
1834 if (!mapping || !mapping->host)
1835 return -EFAULT;
1836
1837 inode = page->mapping->host;
1838
1839 offset += (loff_t)from;
1840 write_data = kmap(page);
1841 write_data += from;
1842
1843 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1844 kunmap(page);
1845 return -EIO;
1846 }
1847
1848
1849 if (offset > mapping->host->i_size) {
1850 kunmap(page);
1851 return 0;
1852 }
1853
1854
1855 if (mapping->host->i_size - offset < (loff_t)to)
1856 to = (unsigned)(mapping->host->i_size - offset);
1857
1858 open_file = find_writable_file(CIFS_I(mapping->host), false);
1859 if (open_file) {
1860 bytes_written = cifs_write(open_file, open_file->pid,
1861 write_data, to - from, &offset);
1862 cifsFileInfo_put(open_file);
1863
1864 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
1865 if ((bytes_written > 0) && (offset))
1866 rc = 0;
1867 else if (bytes_written < 0)
1868 rc = bytes_written;
1869 } else {
1870 cifs_dbg(FYI, "No writeable filehandles for inode\n");
1871 rc = -EIO;
1872 }
1873
1874 kunmap(page);
1875 return rc;
1876}
1877
1878static int cifs_writepages(struct address_space *mapping,
1879 struct writeback_control *wbc)
1880{
1881 struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
1882 bool done = false, scanned = false, range_whole = false;
1883 pgoff_t end, index;
1884 struct cifs_writedata *wdata;
1885 struct TCP_Server_Info *server;
1886 struct page *page;
1887 int rc = 0;
1888
1889
1890
1891
1892
1893 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1894 return generic_writepages(mapping, wbc);
1895
1896 if (wbc->range_cyclic) {
1897 index = mapping->writeback_index;
1898 end = -1;
1899 } else {
1900 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1901 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1902 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1903 range_whole = true;
1904 scanned = true;
1905 }
1906retry:
1907 while (!done && index <= end) {
1908 unsigned int i, nr_pages, found_pages;
1909 pgoff_t next = 0, tofind;
1910 struct page **pages;
1911
1912 tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
1913 end - index) + 1;
1914
1915 wdata = cifs_writedata_alloc((unsigned int)tofind,
1916 cifs_writev_complete);
1917 if (!wdata) {
1918 rc = -ENOMEM;
1919 break;
1920 }
1921
1922
1923
1924
1925
1926
1927
1928 found_pages = 0;
1929 pages = wdata->pages;
1930 do {
1931 nr_pages = find_get_pages_tag(mapping, &index,
1932 PAGECACHE_TAG_DIRTY,
1933 tofind, pages);
1934 found_pages += nr_pages;
1935 tofind -= nr_pages;
1936 pages += nr_pages;
1937 } while (nr_pages && tofind && index <= end);
1938
1939 if (found_pages == 0) {
1940 kref_put(&wdata->refcount, cifs_writedata_release);
1941 break;
1942 }
1943
1944 nr_pages = 0;
1945 for (i = 0; i < found_pages; i++) {
1946 page = wdata->pages[i];
1947
1948
1949
1950
1951
1952
1953
1954
1955 if (nr_pages == 0)
1956 lock_page(page);
1957 else if (!trylock_page(page))
1958 break;
1959
1960 if (unlikely(page->mapping != mapping)) {
1961 unlock_page(page);
1962 break;
1963 }
1964
1965 if (!wbc->range_cyclic && page->index > end) {
1966 done = true;
1967 unlock_page(page);
1968 break;
1969 }
1970
1971 if (next && (page->index != next)) {
1972
1973 unlock_page(page);
1974 break;
1975 }
1976
1977 if (wbc->sync_mode != WB_SYNC_NONE)
1978 wait_on_page_writeback(page);
1979
1980 if (PageWriteback(page) ||
1981 !clear_page_dirty_for_io(page)) {
1982 unlock_page(page);
1983 break;
1984 }
1985
1986
1987
1988
1989
1990 set_page_writeback(page);
1991
1992 if (page_offset(page) >= i_size_read(mapping->host)) {
1993 done = true;
1994 unlock_page(page);
1995 end_page_writeback(page);
1996 break;
1997 }
1998
1999 wdata->pages[i] = page;
2000 next = page->index + 1;
2001 ++nr_pages;
2002 }
2003
2004
2005 if (nr_pages == 0)
2006 index = wdata->pages[0]->index + 1;
2007
2008
2009 for (i = nr_pages; i < found_pages; i++) {
2010 page_cache_release(wdata->pages[i]);
2011 wdata->pages[i] = NULL;
2012 }
2013
2014
2015 if (nr_pages == 0) {
2016 kref_put(&wdata->refcount, cifs_writedata_release);
2017 continue;
2018 }
2019
2020 wdata->sync_mode = wbc->sync_mode;
2021 wdata->nr_pages = nr_pages;
2022 wdata->offset = page_offset(wdata->pages[0]);
2023 wdata->pagesz = PAGE_CACHE_SIZE;
2024 wdata->tailsz =
2025 min(i_size_read(mapping->host) -
2026 page_offset(wdata->pages[nr_pages - 1]),
2027 (loff_t)PAGE_CACHE_SIZE);
2028 wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) +
2029 wdata->tailsz;
2030
2031 do {
2032 if (wdata->cfile != NULL)
2033 cifsFileInfo_put(wdata->cfile);
2034 wdata->cfile = find_writable_file(CIFS_I(mapping->host),
2035 false);
2036 if (!wdata->cfile) {
2037 cifs_dbg(VFS, "No writable handles for inode\n");
2038 rc = -EBADF;
2039 break;
2040 }
2041 wdata->pid = wdata->cfile->pid;
2042 server = tlink_tcon(wdata->cfile->tlink)->ses->server;
2043 rc = server->ops->async_writev(wdata);
2044 } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN);
2045
2046 for (i = 0; i < nr_pages; ++i)
2047 unlock_page(wdata->pages[i]);
2048
2049
2050 if (rc != 0) {
2051 for (i = 0; i < nr_pages; ++i) {
2052 if (rc == -EAGAIN)
2053 redirty_page_for_writepage(wbc,
2054 wdata->pages[i]);
2055 else
2056 SetPageError(wdata->pages[i]);
2057 end_page_writeback(wdata->pages[i]);
2058 page_cache_release(wdata->pages[i]);
2059 }
2060 if (rc != -EAGAIN)
2061 mapping_set_error(mapping, rc);
2062 }
2063 kref_put(&wdata->refcount, cifs_writedata_release);
2064
2065 wbc->nr_to_write -= nr_pages;
2066 if (wbc->nr_to_write <= 0)
2067 done = true;
2068
2069 index = next;
2070 }
2071
2072 if (!scanned && !done) {
2073
2074
2075
2076
2077 scanned = true;
2078 index = 0;
2079 goto retry;
2080 }
2081
2082 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2083 mapping->writeback_index = index;
2084
2085 return rc;
2086}
2087
2088static int
2089cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
2090{
2091 int rc;
2092 unsigned int xid;
2093
2094 xid = get_xid();
2095
2096 page_cache_get(page);
2097 if (!PageUptodate(page))
2098 cifs_dbg(FYI, "ppw - page not up to date\n");
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110 set_page_writeback(page);
2111retry_write:
2112 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
2113 if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
2114 goto retry_write;
2115 else if (rc == -EAGAIN)
2116 redirty_page_for_writepage(wbc, page);
2117 else if (rc != 0)
2118 SetPageError(page);
2119 else
2120 SetPageUptodate(page);
2121 end_page_writeback(page);
2122 page_cache_release(page);
2123 free_xid(xid);
2124 return rc;
2125}
2126
2127static int cifs_writepage(struct page *page, struct writeback_control *wbc)
2128{
2129 int rc = cifs_writepage_locked(page, wbc);
2130 unlock_page(page);
2131 return rc;
2132}
2133
2134static int cifs_write_end(struct file *file, struct address_space *mapping,
2135 loff_t pos, unsigned len, unsigned copied,
2136 struct page *page, void *fsdata)
2137{
2138 int rc;
2139 struct inode *inode = mapping->host;
2140 struct cifsFileInfo *cfile = file->private_data;
2141 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
2142 __u32 pid;
2143
2144 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2145 pid = cfile->pid;
2146 else
2147 pid = current->tgid;
2148
2149 cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
2150 page, pos, copied);
2151
2152 if (PageChecked(page)) {
2153 if (copied == len)
2154 SetPageUptodate(page);
2155 ClearPageChecked(page);
2156 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
2157 SetPageUptodate(page);
2158
2159 if (!PageUptodate(page)) {
2160 char *page_data;
2161 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
2162 unsigned int xid;
2163
2164 xid = get_xid();
2165
2166
2167
2168
2169
2170 page_data = kmap(page);
2171 rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
2172
2173 kunmap(page);
2174
2175 free_xid(xid);
2176 } else {
2177 rc = copied;
2178 pos += copied;
2179 set_page_dirty(page);
2180 }
2181
2182 if (rc > 0) {
2183 spin_lock(&inode->i_lock);
2184 if (pos > inode->i_size)
2185 i_size_write(inode, pos);
2186 spin_unlock(&inode->i_lock);
2187 }
2188
2189 unlock_page(page);
2190 page_cache_release(page);
2191
2192 return rc;
2193}
2194
2195int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
2196 int datasync)
2197{
2198 unsigned int xid;
2199 int rc = 0;
2200 struct cifs_tcon *tcon;
2201 struct TCP_Server_Info *server;
2202 struct cifsFileInfo *smbfile = file->private_data;
2203 struct inode *inode = file_inode(file);
2204 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2205
2206 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2207 if (rc)
2208 return rc;
2209 mutex_lock(&inode->i_mutex);
2210
2211 xid = get_xid();
2212
2213 cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n",
2214 file->f_path.dentry->d_name.name, datasync);
2215
2216 if (!CIFS_I(inode)->clientCanCacheRead) {
2217 rc = cifs_invalidate_mapping(inode);
2218 if (rc) {
2219 cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc);
2220 rc = 0;
2221 }
2222 }
2223
2224 tcon = tlink_tcon(smbfile->tlink);
2225 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2226 server = tcon->ses->server;
2227 if (server->ops->flush)
2228 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2229 else
2230 rc = -ENOSYS;
2231 }
2232
2233 free_xid(xid);
2234 mutex_unlock(&inode->i_mutex);
2235 return rc;
2236}
2237
2238int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2239{
2240 unsigned int xid;
2241 int rc = 0;
2242 struct cifs_tcon *tcon;
2243 struct TCP_Server_Info *server;
2244 struct cifsFileInfo *smbfile = file->private_data;
2245 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2246 struct inode *inode = file->f_mapping->host;
2247
2248 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2249 if (rc)
2250 return rc;
2251 mutex_lock(&inode->i_mutex);
2252
2253 xid = get_xid();
2254
2255 cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n",
2256 file->f_path.dentry->d_name.name, datasync);
2257
2258 tcon = tlink_tcon(smbfile->tlink);
2259 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2260 server = tcon->ses->server;
2261 if (server->ops->flush)
2262 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2263 else
2264 rc = -ENOSYS;
2265 }
2266
2267 free_xid(xid);
2268 mutex_unlock(&inode->i_mutex);
2269 return rc;
2270}
2271
2272
2273
2274
2275
2276int cifs_flush(struct file *file, fl_owner_t id)
2277{
2278 struct inode *inode = file_inode(file);
2279 int rc = 0;
2280
2281 if (file->f_mode & FMODE_WRITE)
2282 rc = filemap_write_and_wait(inode->i_mapping);
2283
2284 cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc);
2285
2286 return rc;
2287}
2288
2289static int
2290cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
2291{
2292 int rc = 0;
2293 unsigned long i;
2294
2295 for (i = 0; i < num_pages; i++) {
2296 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2297 if (!pages[i]) {
2298
2299
2300
2301
2302 num_pages = i;
2303 rc = -ENOMEM;
2304 break;
2305 }
2306 }
2307
2308 if (rc) {
2309 for (i = 0; i < num_pages; i++)
2310 put_page(pages[i]);
2311 }
2312 return rc;
2313}
2314
2315static inline
2316size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
2317{
2318 size_t num_pages;
2319 size_t clen;
2320
2321 clen = min_t(const size_t, len, wsize);
2322 num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
2323
2324 if (cur_len)
2325 *cur_len = clen;
2326
2327 return num_pages;
2328}
2329
2330static void
2331cifs_uncached_writev_complete(struct work_struct *work)
2332{
2333 int i;
2334 struct cifs_writedata *wdata = container_of(work,
2335 struct cifs_writedata, work);
2336 struct inode *inode = wdata->cfile->dentry->d_inode;
2337 struct cifsInodeInfo *cifsi = CIFS_I(inode);
2338
2339 spin_lock(&inode->i_lock);
2340 cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
2341 if (cifsi->server_eof > inode->i_size)
2342 i_size_write(inode, cifsi->server_eof);
2343 spin_unlock(&inode->i_lock);
2344
2345 complete(&wdata->done);
2346
2347 if (wdata->result != -EAGAIN) {
2348 for (i = 0; i < wdata->nr_pages; i++)
2349 put_page(wdata->pages[i]);
2350 }
2351
2352 kref_put(&wdata->refcount, cifs_writedata_release);
2353}
2354
2355
2356static int
2357cifs_uncached_retry_writev(struct cifs_writedata *wdata)
2358{
2359 int rc;
2360 struct TCP_Server_Info *server;
2361
2362 server = tlink_tcon(wdata->cfile->tlink)->ses->server;
2363
2364 do {
2365 if (wdata->cfile->invalidHandle) {
2366 rc = cifs_reopen_file(wdata->cfile, false);
2367 if (rc != 0)
2368 continue;
2369 }
2370 rc = server->ops->async_writev(wdata);
2371 } while (rc == -EAGAIN);
2372
2373 return rc;
2374}
2375
2376static ssize_t
2377cifs_iovec_write(struct file *file, const struct iovec *iov,
2378 unsigned long nr_segs, loff_t *poffset)
2379{
2380 unsigned long nr_pages, i;
2381 size_t copied, len, cur_len;
2382 ssize_t total_written = 0;
2383 loff_t offset;
2384 struct iov_iter it;
2385 struct cifsFileInfo *open_file;
2386 struct cifs_tcon *tcon;
2387 struct cifs_sb_info *cifs_sb;
2388 struct cifs_writedata *wdata, *tmp;
2389 struct list_head wdata_list;
2390 int rc;
2391 pid_t pid;
2392
2393 len = iov_length(iov, nr_segs);
2394 if (!len)
2395 return 0;
2396
2397 rc = generic_write_checks(file, poffset, &len, 0);
2398 if (rc)
2399 return rc;
2400
2401 INIT_LIST_HEAD(&wdata_list);
2402 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2403 open_file = file->private_data;
2404 tcon = tlink_tcon(open_file->tlink);
2405
2406 if (!tcon->ses->server->ops->async_writev)
2407 return -ENOSYS;
2408
2409 offset = *poffset;
2410
2411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2412 pid = open_file->pid;
2413 else
2414 pid = current->tgid;
2415
2416 iov_iter_init(&it, iov, nr_segs, len, 0);
2417 do {
2418 size_t save_len;
2419
2420 nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len);
2421 wdata = cifs_writedata_alloc(nr_pages,
2422 cifs_uncached_writev_complete);
2423 if (!wdata) {
2424 rc = -ENOMEM;
2425 break;
2426 }
2427
2428 rc = cifs_write_allocate_pages(wdata->pages, nr_pages);
2429 if (rc) {
2430 kfree(wdata);
2431 break;
2432 }
2433
2434 save_len = cur_len;
2435 for (i = 0; i < nr_pages; i++) {
2436 copied = min_t(const size_t, cur_len, PAGE_SIZE);
2437 copied = iov_iter_copy_from_user(wdata->pages[i], &it,
2438 0, copied);
2439 cur_len -= copied;
2440 iov_iter_advance(&it, copied);
2441 }
2442 cur_len = save_len - cur_len;
2443
2444 wdata->sync_mode = WB_SYNC_ALL;
2445 wdata->nr_pages = nr_pages;
2446 wdata->offset = (__u64)offset;
2447 wdata->cfile = cifsFileInfo_get(open_file);
2448 wdata->pid = pid;
2449 wdata->bytes = cur_len;
2450 wdata->pagesz = PAGE_SIZE;
2451 wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE);
2452 rc = cifs_uncached_retry_writev(wdata);
2453 if (rc) {
2454 kref_put(&wdata->refcount, cifs_writedata_release);
2455 break;
2456 }
2457
2458 list_add_tail(&wdata->list, &wdata_list);
2459 offset += cur_len;
2460 len -= cur_len;
2461 } while (len > 0);
2462
2463
2464
2465
2466
2467
2468
2469 if (!list_empty(&wdata_list))
2470 rc = 0;
2471
2472
2473
2474
2475
2476
2477restart_loop:
2478 list_for_each_entry_safe(wdata, tmp, &wdata_list, list) {
2479 if (!rc) {
2480
2481 rc = wait_for_completion_killable(&wdata->done);
2482 if (rc)
2483 rc = -EINTR;
2484 else if (wdata->result)
2485 rc = wdata->result;
2486 else
2487 total_written += wdata->bytes;
2488
2489
2490 if (rc == -EAGAIN) {
2491 rc = cifs_uncached_retry_writev(wdata);
2492 goto restart_loop;
2493 }
2494 }
2495 list_del_init(&wdata->list);
2496 kref_put(&wdata->refcount, cifs_writedata_release);
2497 }
2498
2499 if (total_written > 0)
2500 *poffset += total_written;
2501
2502 cifs_stats_bytes_written(tcon, total_written);
2503 return total_written ? total_written : (ssize_t)rc;
2504}
2505
2506ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
2507 unsigned long nr_segs, loff_t pos)
2508{
2509 ssize_t written;
2510 struct inode *inode;
2511
2512 inode = file_inode(iocb->ki_filp);
2513
2514
2515
2516
2517
2518
2519
2520 written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos);
2521 if (written > 0) {
2522 CIFS_I(inode)->invalid_mapping = true;
2523 iocb->ki_pos = pos;
2524 }
2525
2526 return written;
2527}
2528
2529static ssize_t
2530cifs_writev(struct kiocb *iocb, const struct iovec *iov,
2531 unsigned long nr_segs, loff_t pos)
2532{
2533 struct file *file = iocb->ki_filp;
2534 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
2535 struct inode *inode = file->f_mapping->host;
2536 struct cifsInodeInfo *cinode = CIFS_I(inode);
2537 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
2538 ssize_t rc = -EACCES;
2539
2540 BUG_ON(iocb->ki_pos != pos);
2541
2542
2543
2544
2545
2546 down_read(&cinode->lock_sem);
2547 if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
2548 server->vals->exclusive_lock_type, NULL,
2549 CIFS_WRITE_OP)) {
2550 mutex_lock(&inode->i_mutex);
2551 rc = __generic_file_aio_write(iocb, iov, nr_segs,
2552 &iocb->ki_pos);
2553 mutex_unlock(&inode->i_mutex);
2554 }
2555
2556 if (rc > 0 || rc == -EIOCBQUEUED) {
2557 ssize_t err;
2558
2559 err = generic_write_sync(file, pos, rc);
2560 if (err < 0 && rc > 0)
2561 rc = err;
2562 }
2563
2564 up_read(&cinode->lock_sem);
2565 return rc;
2566}
2567
2568ssize_t
2569cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
2570 unsigned long nr_segs, loff_t pos)
2571{
2572 struct inode *inode = file_inode(iocb->ki_filp);
2573 struct cifsInodeInfo *cinode = CIFS_I(inode);
2574 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2575 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
2576 iocb->ki_filp->private_data;
2577 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2578 ssize_t written;
2579
2580 if (cinode->clientCanCacheAll) {
2581 if (cap_unix(tcon->ses) &&
2582 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
2583 && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
2584 return generic_file_aio_write(iocb, iov, nr_segs, pos);
2585 return cifs_writev(iocb, iov, nr_segs, pos);
2586 }
2587
2588
2589
2590
2591
2592
2593 written = cifs_user_writev(iocb, iov, nr_segs, pos);
2594 if (written > 0 && cinode->clientCanCacheRead) {
2595
2596
2597
2598
2599
2600 cifs_invalidate_mapping(inode);
2601 cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n",
2602 inode);
2603 cinode->clientCanCacheRead = false;
2604 }
2605 return written;
2606}
2607
2608static struct cifs_readdata *
2609cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
2610{
2611 struct cifs_readdata *rdata;
2612
2613 rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),
2614 GFP_KERNEL);
2615 if (rdata != NULL) {
2616 kref_init(&rdata->refcount);
2617 INIT_LIST_HEAD(&rdata->list);
2618 init_completion(&rdata->done);
2619 INIT_WORK(&rdata->work, complete);
2620 }
2621
2622 return rdata;
2623}
2624
2625void
2626cifs_readdata_release(struct kref *refcount)
2627{
2628 struct cifs_readdata *rdata = container_of(refcount,
2629 struct cifs_readdata, refcount);
2630
2631 if (rdata->cfile)
2632 cifsFileInfo_put(rdata->cfile);
2633
2634 kfree(rdata);
2635}
2636
2637static int
2638cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages)
2639{
2640 int rc = 0;
2641 struct page *page;
2642 unsigned int i;
2643
2644 for (i = 0; i < nr_pages; i++) {
2645 page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2646 if (!page) {
2647 rc = -ENOMEM;
2648 break;
2649 }
2650 rdata->pages[i] = page;
2651 }
2652
2653 if (rc) {
2654 for (i = 0; i < nr_pages; i++) {
2655 put_page(rdata->pages[i]);
2656 rdata->pages[i] = NULL;
2657 }
2658 }
2659 return rc;
2660}
2661
2662static void
2663cifs_uncached_readdata_release(struct kref *refcount)
2664{
2665 struct cifs_readdata *rdata = container_of(refcount,
2666 struct cifs_readdata, refcount);
2667 unsigned int i;
2668
2669 for (i = 0; i < rdata->nr_pages; i++) {
2670 put_page(rdata->pages[i]);
2671 rdata->pages[i] = NULL;
2672 }
2673 cifs_readdata_release(refcount);
2674}
2675
2676static int
2677cifs_retry_async_readv(struct cifs_readdata *rdata)
2678{
2679 int rc;
2680 struct TCP_Server_Info *server;
2681
2682 server = tlink_tcon(rdata->cfile->tlink)->ses->server;
2683
2684 do {
2685 if (rdata->cfile->invalidHandle) {
2686 rc = cifs_reopen_file(rdata->cfile, true);
2687 if (rc != 0)
2688 continue;
2689 }
2690 rc = server->ops->async_readv(rdata);
2691 } while (rc == -EAGAIN);
2692
2693 return rc;
2694}
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708static ssize_t
2709cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
2710 unsigned long nr_segs, loff_t offset, ssize_t *copied)
2711{
2712 int rc = 0;
2713 struct iov_iter ii;
2714 size_t pos = rdata->offset - offset;
2715 ssize_t remaining = rdata->bytes;
2716 unsigned char *pdata;
2717 unsigned int i;
2718
2719
2720 iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
2721 iov_iter_advance(&ii, pos);
2722
2723 *copied = 0;
2724 for (i = 0; i < rdata->nr_pages; i++) {
2725 ssize_t copy;
2726 struct page *page = rdata->pages[i];
2727
2728
2729 copy = min_t(ssize_t, remaining, PAGE_SIZE);
2730
2731
2732 copy = min_t(ssize_t, copy, iov_iter_count(&ii));
2733
2734
2735 if (copy && !rc) {
2736 pdata = kmap(page);
2737 rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset,
2738 (int)copy);
2739 kunmap(page);
2740 if (!rc) {
2741 *copied += copy;
2742 remaining -= copy;
2743 iov_iter_advance(&ii, copy);
2744 }
2745 }
2746 }
2747
2748 return rc;
2749}
2750
2751static void
2752cifs_uncached_readv_complete(struct work_struct *work)
2753{
2754 struct cifs_readdata *rdata = container_of(work,
2755 struct cifs_readdata, work);
2756
2757 complete(&rdata->done);
2758 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2759}
2760
2761static int
2762cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
2763 struct cifs_readdata *rdata, unsigned int len)
2764{
2765 int total_read = 0, result = 0;
2766 unsigned int i;
2767 unsigned int nr_pages = rdata->nr_pages;
2768 struct kvec iov;
2769
2770 rdata->tailsz = PAGE_SIZE;
2771 for (i = 0; i < nr_pages; i++) {
2772 struct page *page = rdata->pages[i];
2773
2774 if (len >= PAGE_SIZE) {
2775
2776 iov.iov_base = kmap(page);
2777 iov.iov_len = PAGE_SIZE;
2778 cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
2779 i, iov.iov_base, iov.iov_len);
2780 len -= PAGE_SIZE;
2781 } else if (len > 0) {
2782
2783 iov.iov_base = kmap(page);
2784 iov.iov_len = len;
2785 cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
2786 i, iov.iov_base, iov.iov_len);
2787 memset(iov.iov_base + len, '\0', PAGE_SIZE - len);
2788 rdata->tailsz = len;
2789 len = 0;
2790 } else {
2791
2792 rdata->pages[i] = NULL;
2793 rdata->nr_pages--;
2794 put_page(page);
2795 continue;
2796 }
2797
2798 result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
2799 kunmap(page);
2800 if (result < 0)
2801 break;
2802
2803 total_read += result;
2804 }
2805
2806 return total_read > 0 ? total_read : result;
2807}
2808
2809static ssize_t
2810cifs_iovec_read(struct file *file, const struct iovec *iov,
2811 unsigned long nr_segs, loff_t *poffset)
2812{
2813 ssize_t rc;
2814 size_t len, cur_len;
2815 ssize_t total_read = 0;
2816 loff_t offset = *poffset;
2817 unsigned int npages;
2818 struct cifs_sb_info *cifs_sb;
2819 struct cifs_tcon *tcon;
2820 struct cifsFileInfo *open_file;
2821 struct cifs_readdata *rdata, *tmp;
2822 struct list_head rdata_list;
2823 pid_t pid;
2824
2825 if (!nr_segs)
2826 return 0;
2827
2828 len = iov_length(iov, nr_segs);
2829 if (!len)
2830 return 0;
2831
2832 INIT_LIST_HEAD(&rdata_list);
2833 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2834 open_file = file->private_data;
2835 tcon = tlink_tcon(open_file->tlink);
2836
2837 if (!tcon->ses->server->ops->async_readv)
2838 return -ENOSYS;
2839
2840 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2841 pid = open_file->pid;
2842 else
2843 pid = current->tgid;
2844
2845 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
2846 cifs_dbg(FYI, "attempting read on write only file instance\n");
2847
2848 do {
2849 cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
2850 npages = DIV_ROUND_UP(cur_len, PAGE_SIZE);
2851
2852
2853 rdata = cifs_readdata_alloc(npages,
2854 cifs_uncached_readv_complete);
2855 if (!rdata) {
2856 rc = -ENOMEM;
2857 goto error;
2858 }
2859
2860 rc = cifs_read_allocate_pages(rdata, npages);
2861 if (rc)
2862 goto error;
2863
2864 rdata->cfile = cifsFileInfo_get(open_file);
2865 rdata->nr_pages = npages;
2866 rdata->offset = offset;
2867 rdata->bytes = cur_len;
2868 rdata->pid = pid;
2869 rdata->pagesz = PAGE_SIZE;
2870 rdata->read_into_pages = cifs_uncached_read_into_pages;
2871
2872 rc = cifs_retry_async_readv(rdata);
2873error:
2874 if (rc) {
2875 kref_put(&rdata->refcount,
2876 cifs_uncached_readdata_release);
2877 break;
2878 }
2879
2880 list_add_tail(&rdata->list, &rdata_list);
2881 offset += cur_len;
2882 len -= cur_len;
2883 } while (len > 0);
2884
2885
2886 if (!list_empty(&rdata_list))
2887 rc = 0;
2888
2889
2890restart_loop:
2891 list_for_each_entry_safe(rdata, tmp, &rdata_list, list) {
2892 if (!rc) {
2893 ssize_t copied;
2894
2895
2896 rc = wait_for_completion_killable(&rdata->done);
2897 if (rc)
2898 rc = -EINTR;
2899 else if (rdata->result)
2900 rc = rdata->result;
2901 else {
2902 rc = cifs_readdata_to_iov(rdata, iov,
2903 nr_segs, *poffset,
2904 &copied);
2905 total_read += copied;
2906 }
2907
2908
2909 if (rc == -EAGAIN) {
2910 rc = cifs_retry_async_readv(rdata);
2911 goto restart_loop;
2912 }
2913 }
2914 list_del_init(&rdata->list);
2915 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2916 }
2917
2918 cifs_stats_bytes_read(tcon, total_read);
2919 *poffset += total_read;
2920
2921
2922 if (rc == -ENODATA)
2923 rc = 0;
2924
2925 return total_read ? total_read : rc;
2926}
2927
2928ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
2929 unsigned long nr_segs, loff_t pos)
2930{
2931 ssize_t read;
2932
2933 read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
2934 if (read > 0)
2935 iocb->ki_pos = pos;
2936
2937 return read;
2938}
2939
2940ssize_t
2941cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov,
2942 unsigned long nr_segs, loff_t pos)
2943{
2944 struct inode *inode = file_inode(iocb->ki_filp);
2945 struct cifsInodeInfo *cinode = CIFS_I(inode);
2946 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2947 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
2948 iocb->ki_filp->private_data;
2949 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2950 int rc = -EACCES;
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960 if (!cinode->clientCanCacheRead)
2961 return cifs_user_readv(iocb, iov, nr_segs, pos);
2962
2963 if (cap_unix(tcon->ses) &&
2964 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
2965 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
2966 return generic_file_aio_read(iocb, iov, nr_segs, pos);
2967
2968
2969
2970
2971
2972 down_read(&cinode->lock_sem);
2973 if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
2974 tcon->ses->server->vals->shared_lock_type,
2975 NULL, CIFS_READ_OP))
2976 rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
2977 up_read(&cinode->lock_sem);
2978 return rc;
2979}
2980
2981static ssize_t
2982cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
2983{
2984 int rc = -EACCES;
2985 unsigned int bytes_read = 0;
2986 unsigned int total_read;
2987 unsigned int current_read_size;
2988 unsigned int rsize;
2989 struct cifs_sb_info *cifs_sb;
2990 struct cifs_tcon *tcon;
2991 struct TCP_Server_Info *server;
2992 unsigned int xid;
2993 char *cur_offset;
2994 struct cifsFileInfo *open_file;
2995 struct cifs_io_parms io_parms;
2996 int buf_type = CIFS_NO_BUFFER;
2997 __u32 pid;
2998
2999 xid = get_xid();
3000 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
3001
3002
3003 rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
3004
3005 if (file->private_data == NULL) {
3006 rc = -EBADF;
3007 free_xid(xid);
3008 return rc;
3009 }
3010 open_file = file->private_data;
3011 tcon = tlink_tcon(open_file->tlink);
3012 server = tcon->ses->server;
3013
3014 if (!server->ops->sync_read) {
3015 free_xid(xid);
3016 return -ENOSYS;
3017 }
3018
3019 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3020 pid = open_file->pid;
3021 else
3022 pid = current->tgid;
3023
3024 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
3025 cifs_dbg(FYI, "attempting read on write only file instance\n");
3026
3027 for (total_read = 0, cur_offset = read_data; read_size > total_read;
3028 total_read += bytes_read, cur_offset += bytes_read) {
3029 current_read_size = min_t(uint, read_size - total_read, rsize);
3030
3031
3032
3033
3034 if ((tcon->ses) && !(tcon->ses->capabilities &
3035 tcon->ses->server->vals->cap_large_files)) {
3036 current_read_size = min_t(uint, current_read_size,
3037 CIFSMaxBufSize);
3038 }
3039 rc = -EAGAIN;
3040 while (rc == -EAGAIN) {
3041 if (open_file->invalidHandle) {
3042 rc = cifs_reopen_file(open_file, true);
3043 if (rc != 0)
3044 break;
3045 }
3046 io_parms.pid = pid;
3047 io_parms.tcon = tcon;
3048 io_parms.offset = *offset;
3049 io_parms.length = current_read_size;
3050 rc = server->ops->sync_read(xid, open_file, &io_parms,
3051 &bytes_read, &cur_offset,
3052 &buf_type);
3053 }
3054 if (rc || (bytes_read == 0)) {
3055 if (total_read) {
3056 break;
3057 } else {
3058 free_xid(xid);
3059 return rc;
3060 }
3061 } else {
3062 cifs_stats_bytes_read(tcon, total_read);
3063 *offset += bytes_read;
3064 }
3065 }
3066 free_xid(xid);
3067 return total_read;
3068}
3069
3070
3071
3072
3073
3074static int
3075cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
3076{
3077 struct page *page = vmf->page;
3078
3079 lock_page(page);
3080 return VM_FAULT_LOCKED;
3081}
3082
3083static struct vm_operations_struct cifs_file_vm_ops = {
3084 .fault = filemap_fault,
3085 .page_mkwrite = cifs_page_mkwrite,
3086 .remap_pages = generic_file_remap_pages,
3087};
3088
3089int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
3090{
3091 int rc, xid;
3092 struct inode *inode = file_inode(file);
3093
3094 xid = get_xid();
3095
3096 if (!CIFS_I(inode)->clientCanCacheRead) {
3097 rc = cifs_invalidate_mapping(inode);
3098 if (rc)
3099 return rc;
3100 }
3101
3102 rc = generic_file_mmap(file, vma);
3103 if (rc == 0)
3104 vma->vm_ops = &cifs_file_vm_ops;
3105 free_xid(xid);
3106 return rc;
3107}
3108
3109int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
3110{
3111 int rc, xid;
3112
3113 xid = get_xid();
3114 rc = cifs_revalidate_file(file);
3115 if (rc) {
3116 cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
3117 rc);
3118 free_xid(xid);
3119 return rc;
3120 }
3121 rc = generic_file_mmap(file, vma);
3122 if (rc == 0)
3123 vma->vm_ops = &cifs_file_vm_ops;
3124 free_xid(xid);
3125 return rc;
3126}
3127
3128static void
3129cifs_readv_complete(struct work_struct *work)
3130{
3131 unsigned int i;
3132 struct cifs_readdata *rdata = container_of(work,
3133 struct cifs_readdata, work);
3134
3135 for (i = 0; i < rdata->nr_pages; i++) {
3136 struct page *page = rdata->pages[i];
3137
3138 lru_cache_add_file(page);
3139
3140 if (rdata->result == 0) {
3141 flush_dcache_page(page);
3142 SetPageUptodate(page);
3143 }
3144
3145 unlock_page(page);
3146
3147 if (rdata->result == 0)
3148 cifs_readpage_to_fscache(rdata->mapping->host, page);
3149
3150 page_cache_release(page);
3151 rdata->pages[i] = NULL;
3152 }
3153 kref_put(&rdata->refcount, cifs_readdata_release);
3154}
3155
3156static int
3157cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
3158 struct cifs_readdata *rdata, unsigned int len)
3159{
3160 int total_read = 0, result = 0;
3161 unsigned int i;
3162 u64 eof;
3163 pgoff_t eof_index;
3164 unsigned int nr_pages = rdata->nr_pages;
3165 struct kvec iov;
3166
3167
3168 eof = CIFS_I(rdata->mapping->host)->server_eof;
3169 eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
3170 cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index);
3171
3172 rdata->tailsz = PAGE_CACHE_SIZE;
3173 for (i = 0; i < nr_pages; i++) {
3174 struct page *page = rdata->pages[i];
3175
3176 if (len >= PAGE_CACHE_SIZE) {
3177
3178 iov.iov_base = kmap(page);
3179 iov.iov_len = PAGE_CACHE_SIZE;
3180 cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
3181 i, page->index, iov.iov_base, iov.iov_len);
3182 len -= PAGE_CACHE_SIZE;
3183 } else if (len > 0) {
3184
3185 iov.iov_base = kmap(page);
3186 iov.iov_len = len;
3187 cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
3188 i, page->index, iov.iov_base, iov.iov_len);
3189 memset(iov.iov_base + len,
3190 '\0', PAGE_CACHE_SIZE - len);
3191 rdata->tailsz = len;
3192 len = 0;
3193 } else if (page->index > eof_index) {
3194
3195
3196
3197
3198
3199
3200
3201
3202 zero_user(page, 0, PAGE_CACHE_SIZE);
3203 lru_cache_add_file(page);
3204 flush_dcache_page(page);
3205 SetPageUptodate(page);
3206 unlock_page(page);
3207 page_cache_release(page);
3208 rdata->pages[i] = NULL;
3209 rdata->nr_pages--;
3210 continue;
3211 } else {
3212
3213 lru_cache_add_file(page);
3214 unlock_page(page);
3215 page_cache_release(page);
3216 rdata->pages[i] = NULL;
3217 rdata->nr_pages--;
3218 continue;
3219 }
3220
3221 result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
3222 kunmap(page);
3223 if (result < 0)
3224 break;
3225
3226 total_read += result;
3227 }
3228
3229 return total_read > 0 ? total_read : result;
3230}
3231
3232static int cifs_readpages(struct file *file, struct address_space *mapping,
3233 struct list_head *page_list, unsigned num_pages)
3234{
3235 int rc;
3236 struct list_head tmplist;
3237 struct cifsFileInfo *open_file = file->private_data;
3238 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
3239 unsigned int rsize = cifs_sb->rsize;
3240 pid_t pid;
3241
3242
3243
3244
3245
3246
3247
3248 if (unlikely(rsize < PAGE_CACHE_SIZE))
3249 return 0;
3250
3251
3252
3253
3254
3255 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
3256 &num_pages);
3257 if (rc == 0)
3258 return rc;
3259
3260 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3261 pid = open_file->pid;
3262 else
3263 pid = current->tgid;
3264
3265 rc = 0;
3266 INIT_LIST_HEAD(&tmplist);
3267
3268 cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
3269 __func__, file, mapping, num_pages);
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282 while (!list_empty(page_list)) {
3283 unsigned int i;
3284 unsigned int bytes = PAGE_CACHE_SIZE;
3285 unsigned int expected_index;
3286 unsigned int nr_pages = 1;
3287 loff_t offset;
3288 struct page *page, *tpage;
3289 struct cifs_readdata *rdata;
3290
3291 page = list_entry(page_list->prev, struct page, lru);
3292
3293
3294
3295
3296
3297
3298 __set_page_locked(page);
3299 rc = add_to_page_cache_locked(page, mapping,
3300 page->index, GFP_KERNEL);
3301
3302
3303 if (rc) {
3304 __clear_page_locked(page);
3305 break;
3306 }
3307
3308
3309 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3310 list_move_tail(&page->lru, &tmplist);
3311
3312
3313 expected_index = page->index + 1;
3314 list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
3315
3316 if (page->index != expected_index)
3317 break;
3318
3319
3320 if (bytes + PAGE_CACHE_SIZE > rsize)
3321 break;
3322
3323 __set_page_locked(page);
3324 if (add_to_page_cache_locked(page, mapping,
3325 page->index, GFP_KERNEL)) {
3326 __clear_page_locked(page);
3327 break;
3328 }
3329 list_move_tail(&page->lru, &tmplist);
3330 bytes += PAGE_CACHE_SIZE;
3331 expected_index++;
3332 nr_pages++;
3333 }
3334
3335 rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete);
3336 if (!rdata) {
3337
3338 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3339 list_del(&page->lru);
3340 lru_cache_add_file(page);
3341 unlock_page(page);
3342 page_cache_release(page);
3343 }
3344 rc = -ENOMEM;
3345 break;
3346 }
3347
3348 rdata->cfile = cifsFileInfo_get(open_file);
3349 rdata->mapping = mapping;
3350 rdata->offset = offset;
3351 rdata->bytes = bytes;
3352 rdata->pid = pid;
3353 rdata->pagesz = PAGE_CACHE_SIZE;
3354 rdata->read_into_pages = cifs_readpages_read_into_pages;
3355
3356 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3357 list_del(&page->lru);
3358 rdata->pages[rdata->nr_pages++] = page;
3359 }
3360
3361 rc = cifs_retry_async_readv(rdata);
3362 if (rc != 0) {
3363 for (i = 0; i < rdata->nr_pages; i++) {
3364 page = rdata->pages[i];
3365 lru_cache_add_file(page);
3366 unlock_page(page);
3367 page_cache_release(page);
3368 }
3369 kref_put(&rdata->refcount, cifs_readdata_release);
3370 break;
3371 }
3372
3373 kref_put(&rdata->refcount, cifs_readdata_release);
3374 }
3375
3376 return rc;
3377}
3378
3379static int cifs_readpage_worker(struct file *file, struct page *page,
3380 loff_t *poffset)
3381{
3382 char *read_data;
3383 int rc;
3384
3385
3386 rc = cifs_readpage_from_fscache(file_inode(file), page);
3387 if (rc == 0)
3388 goto read_complete;
3389
3390 page_cache_get(page);
3391 read_data = kmap(page);
3392
3393
3394 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
3395
3396 if (rc < 0)
3397 goto io_error;
3398 else
3399 cifs_dbg(FYI, "Bytes read %d\n", rc);
3400
3401 file_inode(file)->i_atime =
3402 current_fs_time(file_inode(file)->i_sb);
3403
3404 if (PAGE_CACHE_SIZE > rc)
3405 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
3406
3407 flush_dcache_page(page);
3408 SetPageUptodate(page);
3409
3410
3411 cifs_readpage_to_fscache(file_inode(file), page);
3412
3413 rc = 0;
3414
3415io_error:
3416 kunmap(page);
3417 page_cache_release(page);
3418
3419read_complete:
3420 return rc;
3421}
3422
3423static int cifs_readpage(struct file *file, struct page *page)
3424{
3425 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3426 int rc = -EACCES;
3427 unsigned int xid;
3428
3429 xid = get_xid();
3430
3431 if (file->private_data == NULL) {
3432 rc = -EBADF;
3433 free_xid(xid);
3434 return rc;
3435 }
3436
3437 cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n",
3438 page, (int)offset, (int)offset);
3439
3440 rc = cifs_readpage_worker(file, page, &offset);
3441
3442 unlock_page(page);
3443
3444 free_xid(xid);
3445 return rc;
3446}
3447
3448static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
3449{
3450 struct cifsFileInfo *open_file;
3451
3452 spin_lock(&cifs_file_list_lock);
3453 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
3454 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
3455 spin_unlock(&cifs_file_list_lock);
3456 return 1;
3457 }
3458 }
3459 spin_unlock(&cifs_file_list_lock);
3460 return 0;
3461}
3462
3463
3464
3465
3466
3467
3468
3469bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
3470{
3471 if (!cifsInode)
3472 return true;
3473
3474 if (is_inode_writable(cifsInode)) {
3475
3476 struct cifs_sb_info *cifs_sb;
3477
3478 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
3479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
3480
3481
3482 return true;
3483 }
3484
3485 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
3486 return true;
3487
3488 return false;
3489 } else
3490 return true;
3491}
3492
3493static int cifs_write_begin(struct file *file, struct address_space *mapping,
3494 loff_t pos, unsigned len, unsigned flags,
3495 struct page **pagep, void **fsdata)
3496{
3497 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
3498 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
3499 loff_t page_start = pos & PAGE_MASK;
3500 loff_t i_size;
3501 struct page *page;
3502 int rc = 0;
3503
3504 cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len);
3505
3506 page = grab_cache_page_write_begin(mapping, index, flags);
3507 if (!page) {
3508 rc = -ENOMEM;
3509 goto out;
3510 }
3511
3512 if (PageUptodate(page))
3513 goto out;
3514
3515
3516
3517
3518
3519
3520 if (len == PAGE_CACHE_SIZE)
3521 goto out;
3522
3523
3524
3525
3526
3527
3528
3529 if (CIFS_I(mapping->host)->clientCanCacheRead) {
3530 i_size = i_size_read(mapping->host);
3531 if (page_start >= i_size ||
3532 (offset == 0 && (pos + len) >= i_size)) {
3533 zero_user_segments(page, 0, offset,
3534 offset + len,
3535 PAGE_CACHE_SIZE);
3536
3537
3538
3539
3540
3541
3542 SetPageChecked(page);
3543 goto out;
3544 }
3545 }
3546
3547 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
3548
3549
3550
3551
3552
3553 cifs_readpage_worker(file, page, &page_start);
3554 } else {
3555
3556
3557
3558
3559 }
3560out:
3561 *pagep = page;
3562 return rc;
3563}
3564
3565static int cifs_release_page(struct page *page, gfp_t gfp)
3566{
3567 if (PagePrivate(page))
3568 return 0;
3569
3570 return cifs_fscache_release_page(page, gfp);
3571}
3572
3573static void cifs_invalidate_page(struct page *page, unsigned int offset,
3574 unsigned int length)
3575{
3576 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
3577
3578 if (offset == 0 && length == PAGE_CACHE_SIZE)
3579 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
3580}
3581
3582static int cifs_launder_page(struct page *page)
3583{
3584 int rc = 0;
3585 loff_t range_start = page_offset(page);
3586 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
3587 struct writeback_control wbc = {
3588 .sync_mode = WB_SYNC_ALL,
3589 .nr_to_write = 0,
3590 .range_start = range_start,
3591 .range_end = range_end,
3592 };
3593
3594 cifs_dbg(FYI, "Launder page: %p\n", page);
3595
3596 if (clear_page_dirty_for_io(page))
3597 rc = cifs_writepage_locked(page, &wbc);
3598
3599 cifs_fscache_invalidate_page(page, page->mapping->host);
3600 return rc;
3601}
3602
3603void cifs_oplock_break(struct work_struct *work)
3604{
3605 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
3606 oplock_break);
3607 struct inode *inode = cfile->dentry->d_inode;
3608 struct cifsInodeInfo *cinode = CIFS_I(inode);
3609 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
3610 int rc = 0;
3611
3612 if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead &&
3613 cifs_has_mand_locks(cinode)) {
3614 cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n",
3615 inode);
3616 cinode->clientCanCacheRead = false;
3617 }
3618
3619 if (inode && S_ISREG(inode->i_mode)) {
3620 if (cinode->clientCanCacheRead)
3621 break_lease(inode, O_RDONLY);
3622 else
3623 break_lease(inode, O_WRONLY);
3624 rc = filemap_fdatawrite(inode->i_mapping);
3625 if (cinode->clientCanCacheRead == 0) {
3626 rc = filemap_fdatawait(inode->i_mapping);
3627 mapping_set_error(inode->i_mapping, rc);
3628 cifs_invalidate_mapping(inode);
3629 }
3630 cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc);
3631 }
3632
3633 rc = cifs_push_locks(cfile);
3634 if (rc)
3635 cifs_dbg(VFS, "Push locks rc = %d\n", rc);
3636
3637
3638
3639
3640
3641
3642
3643 if (!cfile->oplock_break_cancelled) {
3644 rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid,
3645 cinode);
3646 cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
3647 }
3648}
3649
3650const struct address_space_operations cifs_addr_ops = {
3651 .readpage = cifs_readpage,
3652 .readpages = cifs_readpages,
3653 .writepage = cifs_writepage,
3654 .writepages = cifs_writepages,
3655 .write_begin = cifs_write_begin,
3656 .write_end = cifs_write_end,
3657 .set_page_dirty = __set_page_dirty_nobuffers,
3658 .releasepage = cifs_release_page,
3659 .invalidatepage = cifs_invalidate_page,
3660 .launder_page = cifs_launder_page,
3661};
3662
3663
3664
3665
3666
3667
3668const struct address_space_operations cifs_addr_ops_smallbuf = {
3669 .readpage = cifs_readpage,
3670 .writepage = cifs_writepage,
3671 .writepages = cifs_writepages,
3672 .write_begin = cifs_write_begin,
3673 .write_end = cifs_write_end,
3674 .set_page_dirty = __set_page_dirty_nobuffers,
3675 .releasepage = cifs_release_page,
3676 .invalidatepage = cifs_invalidate_page,
3677 .launder_page = cifs_launder_page,
3678};
3679