]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame_incremental - fs/cifs/cifsfs.c
projects / mirror_ubuntu-artful-kernel.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
[CIFS] clean up server protocol handling
[mirror_ubuntu-artful-kernel.git] / fs / cifs / cifsfs.c
... / ...
CommitLineData
1/*
2 * fs/cifs/cifsfs.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24/* Note that BB means BUGBUG (ie something to fix eventually) */
25
26#include <linux/module.h>
27#include <linux/fs.h>
28#include <linux/mount.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/list.h>
32#include <linux/seq_file.h>
33#include <linux/vfs.h>
34#include <linux/mempool.h>
35#include <linux/delay.h>
36#include <linux/kthread.h>
37#include <linux/freezer.h>
38#include "cifsfs.h"
39#include "cifspdu.h"
40#define DECLARE_GLOBALS_HERE
41#include "cifsglob.h"
42#include "cifsproto.h"
43#include "cifs_debug.h"
44#include "cifs_fs_sb.h"
45#include <linux/mm.h>
46#include <linux/key-type.h>
47#include "dns_resolve.h"
48#include "cifs_spnego.h"
49#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
50
51#ifdef CONFIG_CIFS_QUOTA
52static struct quotactl_ops cifs_quotactl_ops;
53#endif /* QUOTA */
54
55int cifsFYI = 0;
56int cifsERROR = 1;
57int traceSMB = 0;
58unsigned int oplockEnabled = 1;
59unsigned int experimEnabled = 0;
60unsigned int linuxExtEnabled = 1;
61unsigned int lookupCacheEnabled = 1;
62unsigned int multiuser_mount = 0;
63unsigned int extended_security = CIFSSEC_DEF;
64/* unsigned int ntlmv2_support = 0; */
65unsigned int sign_CIFS_PDUs = 1;
66extern struct task_struct *oplockThread; /* remove sparse warning */
67struct task_struct *oplockThread = NULL;
68/* extern struct task_struct * dnotifyThread; remove sparse warning */
69static struct task_struct *dnotifyThread = NULL;
70static const struct super_operations cifs_super_ops;
71unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
72module_param(CIFSMaxBufSize, int, 0);
73MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
74 "Default: 16384 Range: 8192 to 130048");
75unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
76module_param(cifs_min_rcv, int, 0);
77MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
78 "1 to 64");
79unsigned int cifs_min_small = 30;
80module_param(cifs_min_small, int, 0);
81MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
82 "Range: 2 to 256");
83unsigned int cifs_max_pending = CIFS_MAX_REQ;
84module_param(cifs_max_pending, int, 0);
85MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
86 "Default: 50 Range: 2 to 256");
87
88extern mempool_t *cifs_sm_req_poolp;
89extern mempool_t *cifs_req_poolp;
90extern mempool_t *cifs_mid_poolp;
91
92extern struct kmem_cache *cifs_oplock_cachep;
93
94static int
95cifs_read_super(struct super_block *sb, void *data,
96 const char *devname, int silent)
97{
98 struct inode *inode;
99 struct cifs_sb_info *cifs_sb;
100 int rc = 0;
101
102 /* BB should we make this contingent on mount parm? */
103 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
104 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
105 cifs_sb = CIFS_SB(sb);
106 if (cifs_sb == NULL)
107 return -ENOMEM;
108
109#ifdef CONFIG_CIFS_DFS_UPCALL
110 /* copy mount params to sb for use in submounts */
111 /* BB: should we move this after the mount so we
112 * do not have to do the copy on failed mounts?
113 * BB: May be it is better to do simple copy before
114 * complex operation (mount), and in case of fail
115 * just exit instead of doing mount and attempting
116 * undo it if this copy fails?*/
117 if (data) {
118 int len = strlen(data);
119 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
120 if (cifs_sb->mountdata == NULL) {
121 kfree(sb->s_fs_info);
122 sb->s_fs_info = NULL;
123 return -ENOMEM;
124 }
125 strncpy(cifs_sb->mountdata, data, len + 1);
126 cifs_sb->mountdata[len] = '\0';
127 }
128#endif
129
130 rc = cifs_mount(sb, cifs_sb, data, devname);
131
132 if (rc) {
133 if (!silent)
134 cERROR(1,
135 ("cifs_mount failed w/return code = %d", rc));
136 goto out_mount_failed;
137 }
138
139 sb->s_magic = CIFS_MAGIC_NUMBER;
140 sb->s_op = &cifs_super_ops;
141/* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
142 sb->s_blocksize =
143 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
144#ifdef CONFIG_CIFS_QUOTA
145 sb->s_qcop = &cifs_quotactl_ops;
146#endif
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_iget(sb, ROOT_I);
150
151 if (IS_ERR(inode)) {
152 rc = PTR_ERR(inode);
153 inode = NULL;
154 goto out_no_root;
155 }
156
157 sb->s_root = d_alloc_root(inode);
158
159 if (!sb->s_root) {
160 rc = -ENOMEM;
161 goto out_no_root;
162 }
163
164#ifdef CONFIG_CIFS_EXPERIMENTAL
165 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
166 cFYI(1, ("export ops supported"));
167 sb->s_export_op = &cifs_export_ops;
168 }
169#endif /* EXPERIMENTAL */
170
171 return 0;
172
173out_no_root:
174 cERROR(1, ("cifs_read_super: get root inode failed"));
175 if (inode)
176 iput(inode);
177
178 cifs_umount(sb, cifs_sb);
179
180out_mount_failed:
181 if (cifs_sb) {
182#ifdef CONFIG_CIFS_DFS_UPCALL
183 if (cifs_sb->mountdata) {
184 kfree(cifs_sb->mountdata);
185 cifs_sb->mountdata = NULL;
186 }
187#endif
188 if (cifs_sb->local_nls)
189 unload_nls(cifs_sb->local_nls);
190 kfree(cifs_sb);
191 }
192 return rc;
193}
194
195static void
196cifs_put_super(struct super_block *sb)
197{
198 int rc = 0;
199 struct cifs_sb_info *cifs_sb;
200
201 cFYI(1, ("In cifs_put_super"));
202 cifs_sb = CIFS_SB(sb);
203 if (cifs_sb == NULL) {
204 cFYI(1, ("Empty cifs superblock info passed to unmount"));
205 return;
206 }
207 rc = cifs_umount(sb, cifs_sb);
208 if (rc)
209 cERROR(1, ("cifs_umount failed with return code %d", rc));
210#ifdef CONFIG_CIFS_DFS_UPCALL
211 if (cifs_sb->mountdata) {
212 kfree(cifs_sb->mountdata);
213 cifs_sb->mountdata = NULL;
214 }
215#endif
216
217 unload_nls(cifs_sb->local_nls);
218 kfree(cifs_sb);
219 return;
220}
221
222static int
223cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
224{
225 struct super_block *sb = dentry->d_sb;
226 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
227 struct cifsTconInfo *tcon = cifs_sb->tcon;
228 int rc = -EOPNOTSUPP;
229 int xid;
230
231 xid = GetXid();
232
233 buf->f_type = CIFS_MAGIC_NUMBER;
234
235 /*
236 * PATH_MAX may be too long - it would presumably be total path,
237 * but note that some servers (includinng Samba 3) have a shorter
238 * maximum path.
239 *
240 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
241 */
242 buf->f_namelen = PATH_MAX;
243 buf->f_files = 0; /* undefined */
244 buf->f_ffree = 0; /* unlimited */
245
246 /*
247 * We could add a second check for a QFS Unix capability bit
248 */
249 if ((tcon->ses->capabilities & CAP_UNIX) &&
250 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
251 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
252
253 /*
254 * Only need to call the old QFSInfo if failed on newer one,
255 * e.g. by OS/2.
256 **/
257 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
258 rc = CIFSSMBQFSInfo(xid, tcon, buf);
259
260 /*
261 * Some old Windows servers also do not support level 103, retry with
262 * older level one if old server failed the previous call or we
263 * bypassed it because we detected that this was an older LANMAN sess
264 */
265 if (rc)
266 rc = SMBOldQFSInfo(xid, tcon, buf);
267
268 FreeXid(xid);
269 return 0;
270}
271
272static int cifs_permission(struct inode *inode, int mask)
273{
274 struct cifs_sb_info *cifs_sb;
275
276 cifs_sb = CIFS_SB(inode->i_sb);
277
278 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
279 if ((mask & MAY_EXEC) && !execute_ok(inode))
280 return -EACCES;
281 else
282 return 0;
283 } else /* file mode might have been restricted at mount time
284 on the client (above and beyond ACL on servers) for
285 servers which do not support setting and viewing mode bits,
286 so allowing client to check permissions is useful */
287 return generic_permission(inode, mask, NULL);
288}
289
290static struct kmem_cache *cifs_inode_cachep;
291static struct kmem_cache *cifs_req_cachep;
292static struct kmem_cache *cifs_mid_cachep;
293struct kmem_cache *cifs_oplock_cachep;
294static struct kmem_cache *cifs_sm_req_cachep;
295mempool_t *cifs_sm_req_poolp;
296mempool_t *cifs_req_poolp;
297mempool_t *cifs_mid_poolp;
298
299static struct inode *
300cifs_alloc_inode(struct super_block *sb)
301{
302 struct cifsInodeInfo *cifs_inode;
303 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
304 if (!cifs_inode)
305 return NULL;
306 cifs_inode->cifsAttrs = 0x20; /* default */
307 atomic_set(&cifs_inode->inUse, 0);
308 cifs_inode->time = 0;
309 cifs_inode->write_behind_rc = 0;
310 /* Until the file is open and we have gotten oplock
311 info back from the server, can not assume caching of
312 file data or metadata */
313 cifs_inode->clientCanCacheRead = false;
314 cifs_inode->clientCanCacheAll = false;
315 cifs_inode->delete_pending = false;
316 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
317
318 /* Can not set i_flags here - they get immediately overwritten
319 to zero by the VFS */
320/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
321 INIT_LIST_HEAD(&cifs_inode->openFileList);
322 return &cifs_inode->vfs_inode;
323}
324
325static void
326cifs_destroy_inode(struct inode *inode)
327{
328 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
329}
330
331/*
332 * cifs_show_options() is for displaying mount options in /proc/mounts.
333 * Not all settable options are displayed but most of the important
334 * ones are.
335 */
336static int
337cifs_show_options(struct seq_file *s, struct vfsmount *m)
338{
339 struct cifs_sb_info *cifs_sb;
340
341 cifs_sb = CIFS_SB(m->mnt_sb);
342
343 if (cifs_sb) {
344 if (cifs_sb->tcon) {
345/* BB add prepath to mount options displayed */
346 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
347 if (cifs_sb->tcon->ses) {
348 if (cifs_sb->tcon->ses->userName)
349 seq_printf(s, ",username=%s",
350 cifs_sb->tcon->ses->userName);
351 if (cifs_sb->tcon->ses->domainName)
352 seq_printf(s, ",domain=%s",
353 cifs_sb->tcon->ses->domainName);
354 }
355 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
356 !(cifs_sb->tcon->unix_ext))
357 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
358 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
359 !(cifs_sb->tcon->unix_ext))
360 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
361 if (!cifs_sb->tcon->unix_ext) {
362 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
363 cifs_sb->mnt_file_mode,
364 cifs_sb->mnt_dir_mode);
365 }
366 if (cifs_sb->tcon->seal)
367 seq_printf(s, ",seal");
368 if (cifs_sb->tcon->nocase)
369 seq_printf(s, ",nocase");
370 if (cifs_sb->tcon->retry)
371 seq_printf(s, ",hard");
372 }
373 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
374 seq_printf(s, ",posixpaths");
375 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
376 seq_printf(s, ",setuids");
377 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
378 seq_printf(s, ",serverino");
379 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
380 seq_printf(s, ",directio");
381 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
382 seq_printf(s, ",nouser_xattr");
383 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
384 seq_printf(s, ",mapchars");
385 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
386 seq_printf(s, ",sfu");
387 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
388 seq_printf(s, ",nobrl");
389 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
390 seq_printf(s, ",cifsacl");
391 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
392 seq_printf(s, ",dynperm");
393 if (m->mnt_sb->s_flags & MS_POSIXACL)
394 seq_printf(s, ",acl");
395
396 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
397 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
398 }
399 return 0;
400}
401
402#ifdef CONFIG_CIFS_QUOTA
403int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
404 struct fs_disk_quota *pdquota)
405{
406 int xid;
407 int rc = 0;
408 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
409 struct cifsTconInfo *pTcon;
410
411 if (cifs_sb)
412 pTcon = cifs_sb->tcon;
413 else
414 return -EIO;
415
416
417 xid = GetXid();
418 if (pTcon) {
419 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
420 } else {
421 rc = -EIO;
422 }
423
424 FreeXid(xid);
425 return rc;
426}
427
428int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
429 struct fs_disk_quota *pdquota)
430{
431 int xid;
432 int rc = 0;
433 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
434 struct cifsTconInfo *pTcon;
435
436 if (cifs_sb)
437 pTcon = cifs_sb->tcon;
438 else
439 return -EIO;
440
441 xid = GetXid();
442 if (pTcon) {
443 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
444 } else {
445 rc = -EIO;
446 }
447
448 FreeXid(xid);
449 return rc;
450}
451
452int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
453{
454 int xid;
455 int rc = 0;
456 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
457 struct cifsTconInfo *pTcon;
458
459 if (cifs_sb)
460 pTcon = cifs_sb->tcon;
461 else
462 return -EIO;
463
464 xid = GetXid();
465 if (pTcon) {
466 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
467 } else {
468 rc = -EIO;
469 }
470
471 FreeXid(xid);
472 return rc;
473}
474
475int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
476{
477 int xid;
478 int rc = 0;
479 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
480 struct cifsTconInfo *pTcon;
481
482 if (cifs_sb) {
483 pTcon = cifs_sb->tcon;
484 } else {
485 return -EIO;
486 }
487 xid = GetXid();
488 if (pTcon) {
489 cFYI(1, ("pqstats %p", qstats));
490 } else {
491 rc = -EIO;
492 }
493
494 FreeXid(xid);
495 return rc;
496}
497
498static struct quotactl_ops cifs_quotactl_ops = {
499 .set_xquota = cifs_xquota_set,
500 .get_xquota = cifs_xquota_get,
501 .set_xstate = cifs_xstate_set,
502 .get_xstate = cifs_xstate_get,
503};
504#endif
505
506static void cifs_umount_begin(struct super_block *sb)
507{
508 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
509 struct cifsTconInfo *tcon;
510
511 if (cifs_sb == NULL)
512 return;
513
514 tcon = cifs_sb->tcon;
515 if (tcon == NULL)
516 return;
517 down(&tcon->tconSem);
518 if (atomic_read(&tcon->useCount) == 1)
519 tcon->tidStatus = CifsExiting;
520 up(&tcon->tconSem);
521
522 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
523 /* cancel_notify_requests(tcon); */
524 if (tcon->ses && tcon->ses->server) {
525 cFYI(1, ("wake up tasks now - umount begin not complete"));
526 wake_up_all(&tcon->ses->server->request_q);
527 wake_up_all(&tcon->ses->server->response_q);
528 msleep(1); /* yield */
529 /* we have to kick the requests once more */
530 wake_up_all(&tcon->ses->server->response_q);
531 msleep(1);
532 }
533/* BB FIXME - finish add checks for tidStatus BB */
534
535 return;
536}
537
538#ifdef CONFIG_CIFS_STATS2
539static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
540{
541 /* BB FIXME */
542 return 0;
543}
544#endif
545
546static int cifs_remount(struct super_block *sb, int *flags, char *data)
547{
548 *flags |= MS_NODIRATIME;
549 return 0;
550}
551
552static const struct super_operations cifs_super_ops = {
553 .put_super = cifs_put_super,
554 .statfs = cifs_statfs,
555 .alloc_inode = cifs_alloc_inode,
556 .destroy_inode = cifs_destroy_inode,
557/* .drop_inode = generic_delete_inode,
558 .delete_inode = cifs_delete_inode, */ /* Do not need above two
559 functions unless later we add lazy close of inodes or unless the
560 kernel forgets to call us with the same number of releases (closes)
561 as opens */
562 .show_options = cifs_show_options,
563 .umount_begin = cifs_umount_begin,
564 .remount_fs = cifs_remount,
565#ifdef CONFIG_CIFS_STATS2
566 .show_stats = cifs_show_stats,
567#endif
568};
569
570static int
571cifs_get_sb(struct file_system_type *fs_type,
572 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
573{
574 int rc;
575 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
576
577 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
578
579 if (IS_ERR(sb))
580 return PTR_ERR(sb);
581
582 sb->s_flags = flags;
583
584 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
585 if (rc) {
586 up_write(&sb->s_umount);
587 deactivate_super(sb);
588 return rc;
589 }
590 sb->s_flags |= MS_ACTIVE;
591 return simple_set_mnt(mnt, sb);
592}
593
594static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
595 unsigned long nr_segs, loff_t pos)
596{
597 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
598 ssize_t written;
599
600 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
601 if (!CIFS_I(inode)->clientCanCacheAll)
602 filemap_fdatawrite(inode->i_mapping);
603 return written;
604}
605
606static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
607{
608 /* origin == SEEK_END => we must revalidate the cached file length */
609 if (origin == SEEK_END) {
610 int retval;
611
612 /* some applications poll for the file length in this strange
613 way so we must seek to end on non-oplocked files by
614 setting the revalidate time to zero */
615 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
616
617 retval = cifs_revalidate(file->f_path.dentry);
618 if (retval < 0)
619 return (loff_t)retval;
620 }
621 return generic_file_llseek_unlocked(file, offset, origin);
622}
623
624#ifdef CONFIG_CIFS_EXPERIMENTAL
625static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
626{
627 /* note that this is called by vfs setlease with the BKL held
628 although I doubt that BKL is needed here in cifs */
629 struct inode *inode = file->f_path.dentry->d_inode;
630
631 if (!(S_ISREG(inode->i_mode)))
632 return -EINVAL;
633
634 /* check if file is oplocked */
635 if (((arg == F_RDLCK) &&
636 (CIFS_I(inode)->clientCanCacheRead)) ||
637 ((arg == F_WRLCK) &&
638 (CIFS_I(inode)->clientCanCacheAll)))
639 return generic_setlease(file, arg, lease);
640 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
641 !CIFS_I(inode)->clientCanCacheRead)
642 /* If the server claims to support oplock on this
643 file, then we still need to check oplock even
644 if the local_lease mount option is set, but there
645 are servers which do not support oplock for which
646 this mount option may be useful if the user
647 knows that the file won't be changed on the server
648 by anyone else */
649 return generic_setlease(file, arg, lease);
650 else
651 return -EAGAIN;
652}
653#endif
654
655struct file_system_type cifs_fs_type = {
656 .owner = THIS_MODULE,
657 .name = "cifs",
658 .get_sb = cifs_get_sb,
659 .kill_sb = kill_anon_super,
660 /* .fs_flags */
661};
662const struct inode_operations cifs_dir_inode_ops = {
663 .create = cifs_create,
664 .lookup = cifs_lookup,
665 .getattr = cifs_getattr,
666 .unlink = cifs_unlink,
667 .link = cifs_hardlink,
668 .mkdir = cifs_mkdir,
669 .rmdir = cifs_rmdir,
670 .rename = cifs_rename,
671 .permission = cifs_permission,
672/* revalidate:cifs_revalidate, */
673 .setattr = cifs_setattr,
674 .symlink = cifs_symlink,
675 .mknod = cifs_mknod,
676#ifdef CONFIG_CIFS_XATTR
677 .setxattr = cifs_setxattr,
678 .getxattr = cifs_getxattr,
679 .listxattr = cifs_listxattr,
680 .removexattr = cifs_removexattr,
681#endif
682};
683
684const struct inode_operations cifs_file_inode_ops = {
685/* revalidate:cifs_revalidate, */
686 .setattr = cifs_setattr,
687 .getattr = cifs_getattr, /* do we need this anymore? */
688 .rename = cifs_rename,
689 .permission = cifs_permission,
690#ifdef CONFIG_CIFS_XATTR
691 .setxattr = cifs_setxattr,
692 .getxattr = cifs_getxattr,
693 .listxattr = cifs_listxattr,
694 .removexattr = cifs_removexattr,
695#endif
696};
697
698const struct inode_operations cifs_symlink_inode_ops = {
699 .readlink = generic_readlink,
700 .follow_link = cifs_follow_link,
701 .put_link = cifs_put_link,
702 .permission = cifs_permission,
703 /* BB add the following two eventually */
704 /* revalidate: cifs_revalidate,
705 setattr: cifs_notify_change, *//* BB do we need notify change */
706#ifdef CONFIG_CIFS_XATTR
707 .setxattr = cifs_setxattr,
708 .getxattr = cifs_getxattr,
709 .listxattr = cifs_listxattr,
710 .removexattr = cifs_removexattr,
711#endif
712};
713
714const struct file_operations cifs_file_ops = {
715 .read = do_sync_read,
716 .write = do_sync_write,
717 .aio_read = generic_file_aio_read,
718 .aio_write = cifs_file_aio_write,
719 .open = cifs_open,
720 .release = cifs_close,
721 .lock = cifs_lock,
722 .fsync = cifs_fsync,
723 .flush = cifs_flush,
724 .mmap = cifs_file_mmap,
725 .splice_read = generic_file_splice_read,
726 .llseek = cifs_llseek,
727#ifdef CONFIG_CIFS_POSIX
728 .unlocked_ioctl = cifs_ioctl,
729#endif /* CONFIG_CIFS_POSIX */
730
731#ifdef CONFIG_CIFS_EXPERIMENTAL
732 .dir_notify = cifs_dir_notify,
733 .setlease = cifs_setlease,
734#endif /* CONFIG_CIFS_EXPERIMENTAL */
735};
736
737const struct file_operations cifs_file_direct_ops = {
738 /* no mmap, no aio, no readv -
739 BB reevaluate whether they can be done with directio, no cache */
740 .read = cifs_user_read,
741 .write = cifs_user_write,
742 .open = cifs_open,
743 .release = cifs_close,
744 .lock = cifs_lock,
745 .fsync = cifs_fsync,
746 .flush = cifs_flush,
747 .splice_read = generic_file_splice_read,
748#ifdef CONFIG_CIFS_POSIX
749 .unlocked_ioctl = cifs_ioctl,
750#endif /* CONFIG_CIFS_POSIX */
751 .llseek = cifs_llseek,
752#ifdef CONFIG_CIFS_EXPERIMENTAL
753 .dir_notify = cifs_dir_notify,
754 .setlease = cifs_setlease,
755#endif /* CONFIG_CIFS_EXPERIMENTAL */
756};
757const struct file_operations cifs_file_nobrl_ops = {
758 .read = do_sync_read,
759 .write = do_sync_write,
760 .aio_read = generic_file_aio_read,
761 .aio_write = cifs_file_aio_write,
762 .open = cifs_open,
763 .release = cifs_close,
764 .fsync = cifs_fsync,
765 .flush = cifs_flush,
766 .mmap = cifs_file_mmap,
767 .splice_read = generic_file_splice_read,
768 .llseek = cifs_llseek,
769#ifdef CONFIG_CIFS_POSIX
770 .unlocked_ioctl = cifs_ioctl,
771#endif /* CONFIG_CIFS_POSIX */
772
773#ifdef CONFIG_CIFS_EXPERIMENTAL
774 .dir_notify = cifs_dir_notify,
775 .setlease = cifs_setlease,
776#endif /* CONFIG_CIFS_EXPERIMENTAL */
777};
778
779const struct file_operations cifs_file_direct_nobrl_ops = {
780 /* no mmap, no aio, no readv -
781 BB reevaluate whether they can be done with directio, no cache */
782 .read = cifs_user_read,
783 .write = cifs_user_write,
784 .open = cifs_open,
785 .release = cifs_close,
786 .fsync = cifs_fsync,
787 .flush = cifs_flush,
788 .splice_read = generic_file_splice_read,
789#ifdef CONFIG_CIFS_POSIX
790 .unlocked_ioctl = cifs_ioctl,
791#endif /* CONFIG_CIFS_POSIX */
792 .llseek = cifs_llseek,
793#ifdef CONFIG_CIFS_EXPERIMENTAL
794 .dir_notify = cifs_dir_notify,
795 .setlease = cifs_setlease,
796#endif /* CONFIG_CIFS_EXPERIMENTAL */
797};
798
799const struct file_operations cifs_dir_ops = {
800 .readdir = cifs_readdir,
801 .release = cifs_closedir,
802 .read = generic_read_dir,
803#ifdef CONFIG_CIFS_EXPERIMENTAL
804 .dir_notify = cifs_dir_notify,
805#endif /* CONFIG_CIFS_EXPERIMENTAL */
806 .unlocked_ioctl = cifs_ioctl,
807 .llseek = generic_file_llseek,
808};
809
810static void
811cifs_init_once(void *inode)
812{
813 struct cifsInodeInfo *cifsi = inode;
814
815 inode_init_once(&cifsi->vfs_inode);
816 INIT_LIST_HEAD(&cifsi->lockList);
817}
818
819static int
820cifs_init_inodecache(void)
821{
822 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
823 sizeof(struct cifsInodeInfo),
824 0, (SLAB_RECLAIM_ACCOUNT|
825 SLAB_MEM_SPREAD),
826 cifs_init_once);
827 if (cifs_inode_cachep == NULL)
828 return -ENOMEM;
829
830 return 0;
831}
832
833static void
834cifs_destroy_inodecache(void)
835{
836 kmem_cache_destroy(cifs_inode_cachep);
837}
838
839static int
840cifs_init_request_bufs(void)
841{
842 if (CIFSMaxBufSize < 8192) {
843 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
844 Unicode path name has to fit in any SMB/CIFS path based frames */
845 CIFSMaxBufSize = 8192;
846 } else if (CIFSMaxBufSize > 1024*127) {
847 CIFSMaxBufSize = 1024 * 127;
848 } else {
849 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
850 }
851/* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
852 cifs_req_cachep = kmem_cache_create("cifs_request",
853 CIFSMaxBufSize +
854 MAX_CIFS_HDR_SIZE, 0,
855 SLAB_HWCACHE_ALIGN, NULL);
856 if (cifs_req_cachep == NULL)
857 return -ENOMEM;
858
859 if (cifs_min_rcv < 1)
860 cifs_min_rcv = 1;
861 else if (cifs_min_rcv > 64) {
862 cifs_min_rcv = 64;
863 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
864 }
865
866 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
867 cifs_req_cachep);
868
869 if (cifs_req_poolp == NULL) {
870 kmem_cache_destroy(cifs_req_cachep);
871 return -ENOMEM;
872 }
873 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
874 almost all handle based requests (but not write response, nor is it
875 sufficient for path based requests). A smaller size would have
876 been more efficient (compacting multiple slab items on one 4k page)
877 for the case in which debug was on, but this larger size allows
878 more SMBs to use small buffer alloc and is still much more
879 efficient to alloc 1 per page off the slab compared to 17K (5page)
880 alloc of large cifs buffers even when page debugging is on */
881 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
882 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
883 NULL);
884 if (cifs_sm_req_cachep == NULL) {
885 mempool_destroy(cifs_req_poolp);
886 kmem_cache_destroy(cifs_req_cachep);
887 return -ENOMEM;
888 }
889
890 if (cifs_min_small < 2)
891 cifs_min_small = 2;
892 else if (cifs_min_small > 256) {
893 cifs_min_small = 256;
894 cFYI(1, ("cifs_min_small set to maximum (256)"));
895 }
896
897 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
898 cifs_sm_req_cachep);
899
900 if (cifs_sm_req_poolp == NULL) {
901 mempool_destroy(cifs_req_poolp);
902 kmem_cache_destroy(cifs_req_cachep);
903 kmem_cache_destroy(cifs_sm_req_cachep);
904 return -ENOMEM;
905 }
906
907 return 0;
908}
909
910static void
911cifs_destroy_request_bufs(void)
912{
913 mempool_destroy(cifs_req_poolp);
914 kmem_cache_destroy(cifs_req_cachep);
915 mempool_destroy(cifs_sm_req_poolp);
916 kmem_cache_destroy(cifs_sm_req_cachep);
917}
918
919static int
920cifs_init_mids(void)
921{
922 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
923 sizeof(struct mid_q_entry), 0,
924 SLAB_HWCACHE_ALIGN, NULL);
925 if (cifs_mid_cachep == NULL)
926 return -ENOMEM;
927
928 /* 3 is a reasonable minimum number of simultaneous operations */
929 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
930 if (cifs_mid_poolp == NULL) {
931 kmem_cache_destroy(cifs_mid_cachep);
932 return -ENOMEM;
933 }
934
935 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
936 sizeof(struct oplock_q_entry), 0,
937 SLAB_HWCACHE_ALIGN, NULL);
938 if (cifs_oplock_cachep == NULL) {
939 mempool_destroy(cifs_mid_poolp);
940 kmem_cache_destroy(cifs_mid_cachep);
941 return -ENOMEM;
942 }
943
944 return 0;
945}
946
947static void
948cifs_destroy_mids(void)
949{
950 mempool_destroy(cifs_mid_poolp);
951 kmem_cache_destroy(cifs_mid_cachep);
952 kmem_cache_destroy(cifs_oplock_cachep);
953}
954
955static int cifs_oplock_thread(void *dummyarg)
956{
957 struct oplock_q_entry *oplock_item;
958 struct cifsTconInfo *pTcon;
959 struct inode *inode;
960 __u16 netfid;
961 int rc, waitrc = 0;
962
963 set_freezable();
964 do {
965 if (try_to_freeze())
966 continue;
967
968 spin_lock(&GlobalMid_Lock);
969 if (list_empty(&GlobalOplock_Q)) {
970 spin_unlock(&GlobalMid_Lock);
971 set_current_state(TASK_INTERRUPTIBLE);
972 schedule_timeout(39*HZ);
973 } else {
974 oplock_item = list_entry(GlobalOplock_Q.next,
975 struct oplock_q_entry, qhead);
976 cFYI(1, ("found oplock item to write out"));
977 pTcon = oplock_item->tcon;
978 inode = oplock_item->pinode;
979 netfid = oplock_item->netfid;
980 spin_unlock(&GlobalMid_Lock);
981 DeleteOplockQEntry(oplock_item);
982 /* can not grab inode sem here since it would
983 deadlock when oplock received on delete
984 since vfs_unlink holds the i_mutex across
985 the call */
986 /* mutex_lock(&inode->i_mutex);*/
987 if (S_ISREG(inode->i_mode)) {
988#ifdef CONFIG_CIFS_EXPERIMENTAL
989 if (CIFS_I(inode)->clientCanCacheAll == 0)
990 break_lease(inode, FMODE_READ);
991 else if (CIFS_I(inode)->clientCanCacheRead == 0)
992 break_lease(inode, FMODE_WRITE);
993#endif
994 rc = filemap_fdatawrite(inode->i_mapping);
995 if (CIFS_I(inode)->clientCanCacheRead == 0) {
996 waitrc = filemap_fdatawait(
997 inode->i_mapping);
998 invalidate_remote_inode(inode);
999 }
1000 if (rc == 0)
1001 rc = waitrc;
1002 } else
1003 rc = 0;
1004 /* mutex_unlock(&inode->i_mutex);*/
1005 if (rc)
1006 CIFS_I(inode)->write_behind_rc = rc;
1007 cFYI(1, ("Oplock flush inode %p rc %d",
1008 inode, rc));
1009
1010 /* releasing stale oplock after recent reconnect
1011 of smb session using a now incorrect file
1012 handle is not a data integrity issue but do
1013 not bother sending an oplock release if session
1014 to server still is disconnected since oplock
1015 already released by the server in that case */
1016 if (!pTcon->need_reconnect) {
1017 rc = CIFSSMBLock(0, pTcon, netfid,
1018 0 /* len */ , 0 /* offset */, 0,
1019 0, LOCKING_ANDX_OPLOCK_RELEASE,
1020 false /* wait flag */);
1021 cFYI(1, ("Oplock release rc = %d", rc));
1022 }
1023 set_current_state(TASK_INTERRUPTIBLE);
1024 schedule_timeout(1); /* yield in case q were corrupt */
1025 }
1026 } while (!kthread_should_stop());
1027
1028 return 0;
1029}
1030
1031static int cifs_dnotify_thread(void *dummyarg)
1032{
1033 struct list_head *tmp;
1034 struct cifsSesInfo *ses;
1035
1036 do {
1037 if (try_to_freeze())
1038 continue;
1039 set_current_state(TASK_INTERRUPTIBLE);
1040 schedule_timeout(15*HZ);
1041 read_lock(&GlobalSMBSeslock);
1042 /* check if any stuck requests that need
1043 to be woken up and wakeq so the
1044 thread can wake up and error out */
1045 list_for_each(tmp, &GlobalSMBSessionList) {
1046 ses = list_entry(tmp, struct cifsSesInfo,
1047 cifsSessionList);
1048 if (ses->server && atomic_read(&ses->server->inFlight))
1049 wake_up_all(&ses->server->response_q);
1050 }
1051 read_unlock(&GlobalSMBSeslock);
1052 } while (!kthread_should_stop());
1053
1054 return 0;
1055}
1056
1057static int __init
1058init_cifs(void)
1059{
1060 int rc = 0;
1061 cifs_proc_init();
1062 INIT_LIST_HEAD(&global_cifs_sock_list);
1063 INIT_LIST_HEAD(&GlobalSMBSessionList); /* BB to be removed by jl */
1064 INIT_LIST_HEAD(&GlobalTreeConnectionList); /* BB to be removed by jl */
1065 INIT_LIST_HEAD(&GlobalOplock_Q);
1066#ifdef CONFIG_CIFS_EXPERIMENTAL
1067 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1068 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1069#endif
1070/*
1071 * Initialize Global counters
1072 */
1073 atomic_set(&sesInfoAllocCount, 0);
1074 atomic_set(&tconInfoAllocCount, 0);
1075 atomic_set(&tcpSesAllocCount, 0);
1076 atomic_set(&tcpSesReconnectCount, 0);
1077 atomic_set(&tconInfoReconnectCount, 0);
1078
1079 atomic_set(&bufAllocCount, 0);
1080 atomic_set(&smBufAllocCount, 0);
1081#ifdef CONFIG_CIFS_STATS2
1082 atomic_set(&totBufAllocCount, 0);
1083 atomic_set(&totSmBufAllocCount, 0);
1084#endif /* CONFIG_CIFS_STATS2 */
1085
1086 atomic_set(&midCount, 0);
1087 GlobalCurrentXid = 0;
1088 GlobalTotalActiveXid = 0;
1089 GlobalMaxActiveXid = 0;
1090 memset(Local_System_Name, 0, 15);
1091 rwlock_init(&GlobalSMBSeslock);
1092 spin_lock_init(&GlobalMid_Lock);
1093
1094 if (cifs_max_pending < 2) {
1095 cifs_max_pending = 2;
1096 cFYI(1, ("cifs_max_pending set to min of 2"));
1097 } else if (cifs_max_pending > 256) {
1098 cifs_max_pending = 256;
1099 cFYI(1, ("cifs_max_pending set to max of 256"));
1100 }
1101
1102 rc = cifs_init_inodecache();
1103 if (rc)
1104 goto out_clean_proc;
1105
1106 rc = cifs_init_mids();
1107 if (rc)
1108 goto out_destroy_inodecache;
1109
1110 rc = cifs_init_request_bufs();
1111 if (rc)
1112 goto out_destroy_mids;
1113
1114 rc = register_filesystem(&cifs_fs_type);
1115 if (rc)
1116 goto out_destroy_request_bufs;
1117#ifdef CONFIG_CIFS_UPCALL
1118 rc = register_key_type(&cifs_spnego_key_type);
1119 if (rc)
1120 goto out_unregister_filesystem;
1121#endif
1122#ifdef CONFIG_CIFS_DFS_UPCALL
1123 rc = register_key_type(&key_type_dns_resolver);
1124 if (rc)
1125 goto out_unregister_key_type;
1126#endif
1127 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1128 if (IS_ERR(oplockThread)) {
1129 rc = PTR_ERR(oplockThread);
1130 cERROR(1, ("error %d create oplock thread", rc));
1131 goto out_unregister_dfs_key_type;
1132 }
1133
1134 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1135 if (IS_ERR(dnotifyThread)) {
1136 rc = PTR_ERR(dnotifyThread);
1137 cERROR(1, ("error %d create dnotify thread", rc));
1138 goto out_stop_oplock_thread;
1139 }
1140
1141 return 0;
1142
1143 out_stop_oplock_thread:
1144 kthread_stop(oplockThread);
1145 out_unregister_dfs_key_type:
1146#ifdef CONFIG_CIFS_DFS_UPCALL
1147 unregister_key_type(&key_type_dns_resolver);
1148 out_unregister_key_type:
1149#endif
1150#ifdef CONFIG_CIFS_UPCALL
1151 unregister_key_type(&cifs_spnego_key_type);
1152 out_unregister_filesystem:
1153#endif
1154 unregister_filesystem(&cifs_fs_type);
1155 out_destroy_request_bufs:
1156 cifs_destroy_request_bufs();
1157 out_destroy_mids:
1158 cifs_destroy_mids();
1159 out_destroy_inodecache:
1160 cifs_destroy_inodecache();
1161 out_clean_proc:
1162 cifs_proc_clean();
1163 return rc;
1164}
1165
1166static void __exit
1167exit_cifs(void)
1168{
1169 cFYI(DBG2, ("exit_cifs"));
1170 cifs_proc_clean();
1171#ifdef CONFIG_CIFS_DFS_UPCALL
1172 cifs_dfs_release_automount_timer();
1173 unregister_key_type(&key_type_dns_resolver);
1174#endif
1175#ifdef CONFIG_CIFS_UPCALL
1176 unregister_key_type(&cifs_spnego_key_type);
1177#endif
1178 unregister_filesystem(&cifs_fs_type);
1179 cifs_destroy_inodecache();
1180 cifs_destroy_mids();
1181 cifs_destroy_request_bufs();
1182 kthread_stop(oplockThread);
1183 kthread_stop(dnotifyThread);
1184}
1185
1186MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1187MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1188MODULE_DESCRIPTION
1189 ("VFS to access servers complying with the SNIA CIFS Specification "
1190 "e.g. Samba and Windows");
1191MODULE_VERSION(CIFS_VERSION);
1192module_init(init_cifs)
1193module_exit(exit_cifs)
Ubuntu Artful kernel mirror