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TOMOYO Linux Cross Reference
Linux/fs/cifs/cifsfs.c

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  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 <linux/namei.h>
 39 #include <linux/random.h>
 40 #include <linux/xattr.h>
 41 #include <net/ipv6.h>
 42 #include "cifsfs.h"
 43 #include "cifspdu.h"
 44 #define DECLARE_GLOBALS_HERE
 45 #include "cifsglob.h"
 46 #include "cifsproto.h"
 47 #include "cifs_debug.h"
 48 #include "cifs_fs_sb.h"
 49 #include <linux/mm.h>
 50 #include <linux/key-type.h>
 51 #include "cifs_spnego.h"
 52 #include "fscache.h"
 53 #ifdef CONFIG_CIFS_SMB2
 54 #include "smb2pdu.h"
 55 #endif
 56 
 57 int cifsFYI = 0;
 58 bool traceSMB;
 59 bool enable_oplocks = true;
 60 bool linuxExtEnabled = true;
 61 bool lookupCacheEnabled = true;
 62 unsigned int global_secflags = CIFSSEC_DEF;
 63 /* unsigned int ntlmv2_support = 0; */
 64 unsigned int sign_CIFS_PDUs = 1;
 65 static const struct super_operations cifs_super_ops;
 66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
 67 module_param(CIFSMaxBufSize, uint, 0);
 68 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
 69                                  "Default: 16384 Range: 8192 to 130048");
 70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
 71 module_param(cifs_min_rcv, uint, 0);
 72 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
 73                                 "1 to 64");
 74 unsigned int cifs_min_small = 30;
 75 module_param(cifs_min_small, uint, 0);
 76 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
 77                                  "Range: 2 to 256");
 78 unsigned int cifs_max_pending = CIFS_MAX_REQ;
 79 module_param(cifs_max_pending, uint, 0444);
 80 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
 81                                    "Default: 32767 Range: 2 to 32767.");
 82 module_param(enable_oplocks, bool, 0644);
 83 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
 84 
 85 extern mempool_t *cifs_sm_req_poolp;
 86 extern mempool_t *cifs_req_poolp;
 87 extern mempool_t *cifs_mid_poolp;
 88 
 89 struct workqueue_struct *cifsiod_wq;
 90 __u32 cifs_lock_secret;
 91 
 92 /*
 93  * Bumps refcount for cifs super block.
 94  * Note that it should be only called if a referece to VFS super block is
 95  * already held, e.g. in open-type syscalls context. Otherwise it can race with
 96  * atomic_dec_and_test in deactivate_locked_super.
 97  */
 98 void
 99 cifs_sb_active(struct super_block *sb)
100 {
101         struct cifs_sb_info *server = CIFS_SB(sb);
102 
103         if (atomic_inc_return(&server->active) == 1)
104                 atomic_inc(&sb->s_active);
105 }
106 
107 void
108 cifs_sb_deactive(struct super_block *sb)
109 {
110         struct cifs_sb_info *server = CIFS_SB(sb);
111 
112         if (atomic_dec_and_test(&server->active))
113                 deactivate_super(sb);
114 }
115 
116 static int
117 cifs_read_super(struct super_block *sb)
118 {
119         struct inode *inode;
120         struct cifs_sb_info *cifs_sb;
121         struct cifs_tcon *tcon;
122         int rc = 0;
123 
124         cifs_sb = CIFS_SB(sb);
125         tcon = cifs_sb_master_tcon(cifs_sb);
126 
127         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128                 sb->s_flags |= MS_POSIXACL;
129 
130         if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
131                 sb->s_maxbytes = MAX_LFS_FILESIZE;
132         else
133                 sb->s_maxbytes = MAX_NON_LFS;
134 
135         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
136         sb->s_time_gran = 100;
137 
138         sb->s_magic = CIFS_MAGIC_NUMBER;
139         sb->s_op = &cifs_super_ops;
140         sb->s_xattr = cifs_xattr_handlers;
141         sb->s_bdi = &cifs_sb->bdi;
142         sb->s_blocksize = CIFS_MAX_MSGSIZE;
143         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
144         inode = cifs_root_iget(sb);
145 
146         if (IS_ERR(inode)) {
147                 rc = PTR_ERR(inode);
148                 goto out_no_root;
149         }
150 
151         if (tcon->nocase)
152                 sb->s_d_op = &cifs_ci_dentry_ops;
153         else
154                 sb->s_d_op = &cifs_dentry_ops;
155 
156         sb->s_root = d_make_root(inode);
157         if (!sb->s_root) {
158                 rc = -ENOMEM;
159                 goto out_no_root;
160         }
161 
162 #ifdef CONFIG_CIFS_NFSD_EXPORT
163         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
164                 cifs_dbg(FYI, "export ops supported\n");
165                 sb->s_export_op = &cifs_export_ops;
166         }
167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
168 
169         return 0;
170 
171 out_no_root:
172         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
173         return rc;
174 }
175 
176 static void cifs_kill_sb(struct super_block *sb)
177 {
178         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
179         kill_anon_super(sb);
180         cifs_umount(cifs_sb);
181 }
182 
183 static int
184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
185 {
186         struct super_block *sb = dentry->d_sb;
187         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
188         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
189         struct TCP_Server_Info *server = tcon->ses->server;
190         unsigned int xid;
191         int rc = 0;
192 
193         xid = get_xid();
194 
195         /*
196          * PATH_MAX may be too long - it would presumably be total path,
197          * but note that some servers (includinng Samba 3) have a shorter
198          * maximum path.
199          *
200          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
201          */
202         buf->f_namelen = PATH_MAX;
203         buf->f_files = 0;       /* undefined */
204         buf->f_ffree = 0;       /* unlimited */
205 
206         if (server->ops->queryfs)
207                 rc = server->ops->queryfs(xid, tcon, buf);
208 
209         free_xid(xid);
210         return 0;
211 }
212 
213 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
214 {
215         struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
216         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
217         struct TCP_Server_Info *server = tcon->ses->server;
218 
219         if (server->ops->fallocate)
220                 return server->ops->fallocate(file, tcon, mode, off, len);
221 
222         return -EOPNOTSUPP;
223 }
224 
225 static int cifs_permission(struct inode *inode, int mask)
226 {
227         struct cifs_sb_info *cifs_sb;
228 
229         cifs_sb = CIFS_SB(inode->i_sb);
230 
231         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
232                 if ((mask & MAY_EXEC) && !execute_ok(inode))
233                         return -EACCES;
234                 else
235                         return 0;
236         } else /* file mode might have been restricted at mount time
237                 on the client (above and beyond ACL on servers) for
238                 servers which do not support setting and viewing mode bits,
239                 so allowing client to check permissions is useful */
240                 return generic_permission(inode, mask);
241 }
242 
243 static struct kmem_cache *cifs_inode_cachep;
244 static struct kmem_cache *cifs_req_cachep;
245 static struct kmem_cache *cifs_mid_cachep;
246 static struct kmem_cache *cifs_sm_req_cachep;
247 mempool_t *cifs_sm_req_poolp;
248 mempool_t *cifs_req_poolp;
249 mempool_t *cifs_mid_poolp;
250 
251 static struct inode *
252 cifs_alloc_inode(struct super_block *sb)
253 {
254         struct cifsInodeInfo *cifs_inode;
255         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
256         if (!cifs_inode)
257                 return NULL;
258         cifs_inode->cifsAttrs = 0x20;   /* default */
259         cifs_inode->time = 0;
260         /*
261          * Until the file is open and we have gotten oplock info back from the
262          * server, can not assume caching of file data or metadata.
263          */
264         cifs_set_oplock_level(cifs_inode, 0);
265         cifs_inode->flags = 0;
266         spin_lock_init(&cifs_inode->writers_lock);
267         cifs_inode->writers = 0;
268         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
269         cifs_inode->server_eof = 0;
270         cifs_inode->uniqueid = 0;
271         cifs_inode->createtime = 0;
272         cifs_inode->epoch = 0;
273 #ifdef CONFIG_CIFS_SMB2
274         generate_random_uuid(cifs_inode->lease_key);
275 #endif
276         /*
277          * Can not set i_flags here - they get immediately overwritten to zero
278          * by the VFS.
279          */
280         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
281         INIT_LIST_HEAD(&cifs_inode->openFileList);
282         INIT_LIST_HEAD(&cifs_inode->llist);
283         return &cifs_inode->vfs_inode;
284 }
285 
286 static void cifs_i_callback(struct rcu_head *head)
287 {
288         struct inode *inode = container_of(head, struct inode, i_rcu);
289         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
290 }
291 
292 static void
293 cifs_destroy_inode(struct inode *inode)
294 {
295         call_rcu(&inode->i_rcu, cifs_i_callback);
296 }
297 
298 static void
299 cifs_evict_inode(struct inode *inode)
300 {
301         truncate_inode_pages_final(&inode->i_data);
302         clear_inode(inode);
303         cifs_fscache_release_inode_cookie(inode);
304 }
305 
306 static void
307 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
308 {
309         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
310         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
311 
312         seq_puts(s, ",addr=");
313 
314         switch (server->dstaddr.ss_family) {
315         case AF_INET:
316                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
317                 break;
318         case AF_INET6:
319                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
320                 if (sa6->sin6_scope_id)
321                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
322                 break;
323         default:
324                 seq_puts(s, "(unknown)");
325         }
326 }
327 
328 static void
329 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
330 {
331         if (ses->sectype == Unspecified) {
332                 if (ses->user_name == NULL)
333                         seq_puts(s, ",sec=none");
334                 return;
335         }
336 
337         seq_puts(s, ",sec=");
338 
339         switch (ses->sectype) {
340         case LANMAN:
341                 seq_puts(s, "lanman");
342                 break;
343         case NTLMv2:
344                 seq_puts(s, "ntlmv2");
345                 break;
346         case NTLM:
347                 seq_puts(s, "ntlm");
348                 break;
349         case Kerberos:
350                 seq_puts(s, "krb5");
351                 break;
352         case RawNTLMSSP:
353                 seq_puts(s, "ntlmssp");
354                 break;
355         default:
356                 /* shouldn't ever happen */
357                 seq_puts(s, "unknown");
358                 break;
359         }
360 
361         if (ses->sign)
362                 seq_puts(s, "i");
363 }
364 
365 static void
366 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
367 {
368         seq_puts(s, ",cache=");
369 
370         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
371                 seq_puts(s, "strict");
372         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
373                 seq_puts(s, "none");
374         else
375                 seq_puts(s, "loose");
376 }
377 
378 static void
379 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
380 {
381         struct nls_table *def;
382 
383         /* Display iocharset= option if it's not default charset */
384         def = load_nls_default();
385         if (def != cur)
386                 seq_printf(s, ",iocharset=%s", cur->charset);
387         unload_nls(def);
388 }
389 
390 /*
391  * cifs_show_options() is for displaying mount options in /proc/mounts.
392  * Not all settable options are displayed but most of the important
393  * ones are.
394  */
395 static int
396 cifs_show_options(struct seq_file *s, struct dentry *root)
397 {
398         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
399         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
400         struct sockaddr *srcaddr;
401         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
402 
403         seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
404         cifs_show_security(s, tcon->ses);
405         cifs_show_cache_flavor(s, cifs_sb);
406 
407         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
408                 seq_puts(s, ",multiuser");
409         else if (tcon->ses->user_name)
410                 seq_show_option(s, "username", tcon->ses->user_name);
411 
412         if (tcon->ses->domainName)
413                 seq_show_option(s, "domain", tcon->ses->domainName);
414 
415         if (srcaddr->sa_family != AF_UNSPEC) {
416                 struct sockaddr_in *saddr4;
417                 struct sockaddr_in6 *saddr6;
418                 saddr4 = (struct sockaddr_in *)srcaddr;
419                 saddr6 = (struct sockaddr_in6 *)srcaddr;
420                 if (srcaddr->sa_family == AF_INET6)
421                         seq_printf(s, ",srcaddr=%pI6c",
422                                    &saddr6->sin6_addr);
423                 else if (srcaddr->sa_family == AF_INET)
424                         seq_printf(s, ",srcaddr=%pI4",
425                                    &saddr4->sin_addr.s_addr);
426                 else
427                         seq_printf(s, ",srcaddr=BAD-AF:%i",
428                                    (int)(srcaddr->sa_family));
429         }
430 
431         seq_printf(s, ",uid=%u",
432                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
434                 seq_puts(s, ",forceuid");
435         else
436                 seq_puts(s, ",noforceuid");
437 
438         seq_printf(s, ",gid=%u",
439                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
441                 seq_puts(s, ",forcegid");
442         else
443                 seq_puts(s, ",noforcegid");
444 
445         cifs_show_address(s, tcon->ses->server);
446 
447         if (!tcon->unix_ext)
448                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
449                                            cifs_sb->mnt_file_mode,
450                                            cifs_sb->mnt_dir_mode);
451 
452         cifs_show_nls(s, cifs_sb->local_nls);
453 
454         if (tcon->seal)
455                 seq_puts(s, ",seal");
456         if (tcon->nocase)
457                 seq_puts(s, ",nocase");
458         if (tcon->retry)
459                 seq_puts(s, ",hard");
460         if (tcon->use_persistent)
461                 seq_puts(s, ",persistenthandles");
462         else if (tcon->use_resilient)
463                 seq_puts(s, ",resilienthandles");
464         if (tcon->unix_ext)
465                 seq_puts(s, ",unix");
466         else
467                 seq_puts(s, ",nounix");
468         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
469                 seq_puts(s, ",posixpaths");
470         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
471                 seq_puts(s, ",setuids");
472         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
473                 seq_puts(s, ",serverino");
474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
475                 seq_puts(s, ",rwpidforward");
476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
477                 seq_puts(s, ",forcemand");
478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
479                 seq_puts(s, ",nouser_xattr");
480         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
481                 seq_puts(s, ",mapchars");
482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
483                 seq_puts(s, ",mapposix");
484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
485                 seq_puts(s, ",sfu");
486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
487                 seq_puts(s, ",nobrl");
488         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
489                 seq_puts(s, ",cifsacl");
490         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
491                 seq_puts(s, ",dynperm");
492         if (root->d_sb->s_flags & MS_POSIXACL)
493                 seq_puts(s, ",acl");
494         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
495                 seq_puts(s, ",mfsymlinks");
496         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
497                 seq_puts(s, ",fsc");
498         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
499                 seq_puts(s, ",nostrictsync");
500         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
501                 seq_puts(s, ",noperm");
502         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
503                 seq_printf(s, ",backupuid=%u",
504                            from_kuid_munged(&init_user_ns,
505                                             cifs_sb->mnt_backupuid));
506         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
507                 seq_printf(s, ",backupgid=%u",
508                            from_kgid_munged(&init_user_ns,
509                                             cifs_sb->mnt_backupgid));
510 
511         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
512         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
513         seq_printf(s, ",echo_interval=%lu",
514                         tcon->ses->server->echo_interval / HZ);
515         /* convert actimeo and display it in seconds */
516         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
517 
518         return 0;
519 }
520 
521 static void cifs_umount_begin(struct super_block *sb)
522 {
523         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
524         struct cifs_tcon *tcon;
525 
526         if (cifs_sb == NULL)
527                 return;
528 
529         tcon = cifs_sb_master_tcon(cifs_sb);
530 
531         spin_lock(&cifs_tcp_ses_lock);
532         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
533                 /* we have other mounts to same share or we have
534                    already tried to force umount this and woken up
535                    all waiting network requests, nothing to do */
536                 spin_unlock(&cifs_tcp_ses_lock);
537                 return;
538         } else if (tcon->tc_count == 1)
539                 tcon->tidStatus = CifsExiting;
540         spin_unlock(&cifs_tcp_ses_lock);
541 
542         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
543         /* cancel_notify_requests(tcon); */
544         if (tcon->ses && tcon->ses->server) {
545                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
546                 wake_up_all(&tcon->ses->server->request_q);
547                 wake_up_all(&tcon->ses->server->response_q);
548                 msleep(1); /* yield */
549                 /* we have to kick the requests once more */
550                 wake_up_all(&tcon->ses->server->response_q);
551                 msleep(1);
552         }
553 
554         return;
555 }
556 
557 #ifdef CONFIG_CIFS_STATS2
558 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
559 {
560         /* BB FIXME */
561         return 0;
562 }
563 #endif
564 
565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
566 {
567         sync_filesystem(sb);
568         *flags |= MS_NODIRATIME;
569         return 0;
570 }
571 
572 static int cifs_drop_inode(struct inode *inode)
573 {
574         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
575 
576         /* no serverino => unconditional eviction */
577         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
578                 generic_drop_inode(inode);
579 }
580 
581 static const struct super_operations cifs_super_ops = {
582         .statfs = cifs_statfs,
583         .alloc_inode = cifs_alloc_inode,
584         .destroy_inode = cifs_destroy_inode,
585         .drop_inode     = cifs_drop_inode,
586         .evict_inode    = cifs_evict_inode,
587 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
588         function unless later we add lazy close of inodes or unless the
589         kernel forgets to call us with the same number of releases (closes)
590         as opens */
591         .show_options = cifs_show_options,
592         .umount_begin   = cifs_umount_begin,
593         .remount_fs = cifs_remount,
594 #ifdef CONFIG_CIFS_STATS2
595         .show_stats = cifs_show_stats,
596 #endif
597 };
598 
599 /*
600  * Get root dentry from superblock according to prefix path mount option.
601  * Return dentry with refcount + 1 on success and NULL otherwise.
602  */
603 static struct dentry *
604 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
605 {
606         struct dentry *dentry;
607         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
608         char *full_path = NULL;
609         char *s, *p;
610         char sep;
611 
612         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
613                 return dget(sb->s_root);
614 
615         full_path = cifs_build_path_to_root(vol, cifs_sb,
616                                             cifs_sb_master_tcon(cifs_sb));
617         if (full_path == NULL)
618                 return ERR_PTR(-ENOMEM);
619 
620         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
621 
622         sep = CIFS_DIR_SEP(cifs_sb);
623         dentry = dget(sb->s_root);
624         p = s = full_path;
625 
626         do {
627                 struct inode *dir = d_inode(dentry);
628                 struct dentry *child;
629 
630                 if (!dir) {
631                         dput(dentry);
632                         dentry = ERR_PTR(-ENOENT);
633                         break;
634                 }
635                 if (!S_ISDIR(dir->i_mode)) {
636                         dput(dentry);
637                         dentry = ERR_PTR(-ENOTDIR);
638                         break;
639                 }
640 
641                 /* skip separators */
642                 while (*s == sep)
643                         s++;
644                 if (!*s)
645                         break;
646                 p = s++;
647                 /* next separator */
648                 while (*s && *s != sep)
649                         s++;
650 
651                 child = lookup_one_len_unlocked(p, dentry, s - p);
652                 dput(dentry);
653                 dentry = child;
654         } while (!IS_ERR(dentry));
655         kfree(full_path);
656         return dentry;
657 }
658 
659 static int cifs_set_super(struct super_block *sb, void *data)
660 {
661         struct cifs_mnt_data *mnt_data = data;
662         sb->s_fs_info = mnt_data->cifs_sb;
663         return set_anon_super(sb, NULL);
664 }
665 
666 static struct dentry *
667 cifs_do_mount(struct file_system_type *fs_type,
668               int flags, const char *dev_name, void *data)
669 {
670         int rc;
671         struct super_block *sb;
672         struct cifs_sb_info *cifs_sb;
673         struct smb_vol *volume_info;
674         struct cifs_mnt_data mnt_data;
675         struct dentry *root;
676 
677         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
678 
679         volume_info = cifs_get_volume_info((char *)data, dev_name);
680         if (IS_ERR(volume_info))
681                 return ERR_CAST(volume_info);
682 
683         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
684         if (cifs_sb == NULL) {
685                 root = ERR_PTR(-ENOMEM);
686                 goto out_nls;
687         }
688 
689         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
690         if (cifs_sb->mountdata == NULL) {
691                 root = ERR_PTR(-ENOMEM);
692                 goto out_free;
693         }
694 
695         rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
696         if (rc) {
697                 root = ERR_PTR(rc);
698                 goto out_free;
699         }
700 
701         rc = cifs_mount(cifs_sb, volume_info);
702         if (rc) {
703                 if (!(flags & MS_SILENT))
704                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
705                                  rc);
706                 root = ERR_PTR(rc);
707                 goto out_free;
708         }
709 
710         mnt_data.vol = volume_info;
711         mnt_data.cifs_sb = cifs_sb;
712         mnt_data.flags = flags;
713 
714         /* BB should we make this contingent on mount parm? */
715         flags |= MS_NODIRATIME | MS_NOATIME;
716 
717         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
718         if (IS_ERR(sb)) {
719                 root = ERR_CAST(sb);
720                 cifs_umount(cifs_sb);
721                 goto out;
722         }
723 
724         if (sb->s_root) {
725                 cifs_dbg(FYI, "Use existing superblock\n");
726                 cifs_umount(cifs_sb);
727         } else {
728                 rc = cifs_read_super(sb);
729                 if (rc) {
730                         root = ERR_PTR(rc);
731                         goto out_super;
732                 }
733 
734                 sb->s_flags |= MS_ACTIVE;
735         }
736 
737         root = cifs_get_root(volume_info, sb);
738         if (IS_ERR(root))
739                 goto out_super;
740 
741         cifs_dbg(FYI, "dentry root is: %p\n", root);
742         goto out;
743 
744 out_super:
745         deactivate_locked_super(sb);
746 out:
747         cifs_cleanup_volume_info(volume_info);
748         return root;
749 
750 out_free:
751         kfree(cifs_sb->prepath);
752         kfree(cifs_sb->mountdata);
753         kfree(cifs_sb);
754 out_nls:
755         unload_nls(volume_info->local_nls);
756         goto out;
757 }
758 
759 static ssize_t
760 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
761 {
762         ssize_t rc;
763         struct inode *inode = file_inode(iocb->ki_filp);
764 
765         if (iocb->ki_filp->f_flags & O_DIRECT)
766                 return cifs_user_readv(iocb, iter);
767 
768         rc = cifs_revalidate_mapping(inode);
769         if (rc)
770                 return rc;
771 
772         return generic_file_read_iter(iocb, iter);
773 }
774 
775 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
776 {
777         struct inode *inode = file_inode(iocb->ki_filp);
778         struct cifsInodeInfo *cinode = CIFS_I(inode);
779         ssize_t written;
780         int rc;
781 
782         if (iocb->ki_filp->f_flags & O_DIRECT) {
783                 written = cifs_user_writev(iocb, from);
784                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
785                         cifs_zap_mapping(inode);
786                         cifs_dbg(FYI,
787                                  "Set no oplock for inode=%p after a write operation\n",
788                                  inode);
789                         cinode->oplock = 0;
790                 }
791                 return written;
792         }
793 
794         written = cifs_get_writer(cinode);
795         if (written)
796                 return written;
797 
798         written = generic_file_write_iter(iocb, from);
799 
800         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
801                 goto out;
802 
803         rc = filemap_fdatawrite(inode->i_mapping);
804         if (rc)
805                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
806                          rc, inode);
807 
808 out:
809         cifs_put_writer(cinode);
810         return written;
811 }
812 
813 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
814 {
815         /*
816          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
817          * the cached file length
818          */
819         if (whence != SEEK_SET && whence != SEEK_CUR) {
820                 int rc;
821                 struct inode *inode = file_inode(file);
822 
823                 /*
824                  * We need to be sure that all dirty pages are written and the
825                  * server has the newest file length.
826                  */
827                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
828                     inode->i_mapping->nrpages != 0) {
829                         rc = filemap_fdatawait(inode->i_mapping);
830                         if (rc) {
831                                 mapping_set_error(inode->i_mapping, rc);
832                                 return rc;
833                         }
834                 }
835                 /*
836                  * Some applications poll for the file length in this strange
837                  * way so we must seek to end on non-oplocked files by
838                  * setting the revalidate time to zero.
839                  */
840                 CIFS_I(inode)->time = 0;
841 
842                 rc = cifs_revalidate_file_attr(file);
843                 if (rc < 0)
844                         return (loff_t)rc;
845         }
846         return generic_file_llseek(file, offset, whence);
847 }
848 
849 static int
850 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
851 {
852         /*
853          * Note that this is called by vfs setlease with i_lock held to
854          * protect *lease from going away.
855          */
856         struct inode *inode = file_inode(file);
857         struct cifsFileInfo *cfile = file->private_data;
858 
859         if (!(S_ISREG(inode->i_mode)))
860                 return -EINVAL;
861 
862         /* Check if file is oplocked if this is request for new lease */
863         if (arg == F_UNLCK ||
864             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
865             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
866                 return generic_setlease(file, arg, lease, priv);
867         else if (tlink_tcon(cfile->tlink)->local_lease &&
868                  !CIFS_CACHE_READ(CIFS_I(inode)))
869                 /*
870                  * If the server claims to support oplock on this file, then we
871                  * still need to check oplock even if the local_lease mount
872                  * option is set, but there are servers which do not support
873                  * oplock for which this mount option may be useful if the user
874                  * knows that the file won't be changed on the server by anyone
875                  * else.
876                  */
877                 return generic_setlease(file, arg, lease, priv);
878         else
879                 return -EAGAIN;
880 }
881 
882 struct file_system_type cifs_fs_type = {
883         .owner = THIS_MODULE,
884         .name = "cifs",
885         .mount = cifs_do_mount,
886         .kill_sb = cifs_kill_sb,
887         /*  .fs_flags */
888 };
889 MODULE_ALIAS_FS("cifs");
890 const struct inode_operations cifs_dir_inode_ops = {
891         .create = cifs_create,
892         .atomic_open = cifs_atomic_open,
893         .lookup = cifs_lookup,
894         .getattr = cifs_getattr,
895         .unlink = cifs_unlink,
896         .link = cifs_hardlink,
897         .mkdir = cifs_mkdir,
898         .rmdir = cifs_rmdir,
899         .rename2 = cifs_rename2,
900         .permission = cifs_permission,
901         .setattr = cifs_setattr,
902         .symlink = cifs_symlink,
903         .mknod   = cifs_mknod,
904         .setxattr = generic_setxattr,
905         .getxattr = generic_getxattr,
906         .listxattr = cifs_listxattr,
907         .removexattr = generic_removexattr,
908 };
909 
910 const struct inode_operations cifs_file_inode_ops = {
911         .setattr = cifs_setattr,
912         .getattr = cifs_getattr,
913         .permission = cifs_permission,
914         .setxattr = generic_setxattr,
915         .getxattr = generic_getxattr,
916         .listxattr = cifs_listxattr,
917         .removexattr = generic_removexattr,
918 };
919 
920 const struct inode_operations cifs_symlink_inode_ops = {
921         .readlink = generic_readlink,
922         .get_link = cifs_get_link,
923         .permission = cifs_permission,
924         .setxattr = generic_setxattr,
925         .getxattr = generic_getxattr,
926         .listxattr = cifs_listxattr,
927         .removexattr = generic_removexattr,
928 };
929 
930 static int cifs_clone_file_range(struct file *src_file, loff_t off,
931                 struct file *dst_file, loff_t destoff, u64 len)
932 {
933         struct inode *src_inode = file_inode(src_file);
934         struct inode *target_inode = file_inode(dst_file);
935         struct cifsFileInfo *smb_file_src = src_file->private_data;
936         struct cifsFileInfo *smb_file_target = dst_file->private_data;
937         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
938         unsigned int xid;
939         int rc;
940 
941         cifs_dbg(FYI, "clone range\n");
942 
943         xid = get_xid();
944 
945         if (!src_file->private_data || !dst_file->private_data) {
946                 rc = -EBADF;
947                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
948                 goto out;
949         }
950 
951         /*
952          * Note: cifs case is easier than btrfs since server responsible for
953          * checks for proper open modes and file type and if it wants
954          * server could even support copy of range where source = target
955          */
956         lock_two_nondirectories(target_inode, src_inode);
957 
958         if (len == 0)
959                 len = src_inode->i_size - off;
960 
961         cifs_dbg(FYI, "about to flush pages\n");
962         /* should we flush first and last page first */
963         truncate_inode_pages_range(&target_inode->i_data, destoff,
964                                    PAGE_ALIGN(destoff + len)-1);
965 
966         if (target_tcon->ses->server->ops->duplicate_extents)
967                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
968                         smb_file_src, smb_file_target, off, len, destoff);
969         else
970                 rc = -EOPNOTSUPP;
971 
972         /* force revalidate of size and timestamps of target file now
973            that target is updated on the server */
974         CIFS_I(target_inode)->time = 0;
975         /* although unlocking in the reverse order from locking is not
976            strictly necessary here it is a little cleaner to be consistent */
977         unlock_two_nondirectories(src_inode, target_inode);
978 out:
979         free_xid(xid);
980         return rc;
981 }
982 
983 const struct file_operations cifs_file_ops = {
984         .read_iter = cifs_loose_read_iter,
985         .write_iter = cifs_file_write_iter,
986         .open = cifs_open,
987         .release = cifs_close,
988         .lock = cifs_lock,
989         .fsync = cifs_fsync,
990         .flush = cifs_flush,
991         .mmap  = cifs_file_mmap,
992         .splice_read = generic_file_splice_read,
993         .llseek = cifs_llseek,
994         .unlocked_ioctl = cifs_ioctl,
995         .clone_file_range = cifs_clone_file_range,
996         .setlease = cifs_setlease,
997         .fallocate = cifs_fallocate,
998 };
999 
1000 const struct file_operations cifs_file_strict_ops = {
1001         .read_iter = cifs_strict_readv,
1002         .write_iter = cifs_strict_writev,
1003         .open = cifs_open,
1004         .release = cifs_close,
1005         .lock = cifs_lock,
1006         .fsync = cifs_strict_fsync,
1007         .flush = cifs_flush,
1008         .mmap = cifs_file_strict_mmap,
1009         .splice_read = generic_file_splice_read,
1010         .llseek = cifs_llseek,
1011         .unlocked_ioctl = cifs_ioctl,
1012         .clone_file_range = cifs_clone_file_range,
1013         .setlease = cifs_setlease,
1014         .fallocate = cifs_fallocate,
1015 };
1016 
1017 const struct file_operations cifs_file_direct_ops = {
1018         /* BB reevaluate whether they can be done with directio, no cache */
1019         .read_iter = cifs_user_readv,
1020         .write_iter = cifs_user_writev,
1021         .open = cifs_open,
1022         .release = cifs_close,
1023         .lock = cifs_lock,
1024         .fsync = cifs_fsync,
1025         .flush = cifs_flush,
1026         .mmap = cifs_file_mmap,
1027         .splice_read = generic_file_splice_read,
1028         .unlocked_ioctl  = cifs_ioctl,
1029         .clone_file_range = cifs_clone_file_range,
1030         .llseek = cifs_llseek,
1031         .setlease = cifs_setlease,
1032         .fallocate = cifs_fallocate,
1033 };
1034 
1035 const struct file_operations cifs_file_nobrl_ops = {
1036         .read_iter = cifs_loose_read_iter,
1037         .write_iter = cifs_file_write_iter,
1038         .open = cifs_open,
1039         .release = cifs_close,
1040         .fsync = cifs_fsync,
1041         .flush = cifs_flush,
1042         .mmap  = cifs_file_mmap,
1043         .splice_read = generic_file_splice_read,
1044         .llseek = cifs_llseek,
1045         .unlocked_ioctl = cifs_ioctl,
1046         .clone_file_range = cifs_clone_file_range,
1047         .setlease = cifs_setlease,
1048         .fallocate = cifs_fallocate,
1049 };
1050 
1051 const struct file_operations cifs_file_strict_nobrl_ops = {
1052         .read_iter = cifs_strict_readv,
1053         .write_iter = cifs_strict_writev,
1054         .open = cifs_open,
1055         .release = cifs_close,
1056         .fsync = cifs_strict_fsync,
1057         .flush = cifs_flush,
1058         .mmap = cifs_file_strict_mmap,
1059         .splice_read = generic_file_splice_read,
1060         .llseek = cifs_llseek,
1061         .unlocked_ioctl = cifs_ioctl,
1062         .clone_file_range = cifs_clone_file_range,
1063         .setlease = cifs_setlease,
1064         .fallocate = cifs_fallocate,
1065 };
1066 
1067 const struct file_operations cifs_file_direct_nobrl_ops = {
1068         /* BB reevaluate whether they can be done with directio, no cache */
1069         .read_iter = cifs_user_readv,
1070         .write_iter = cifs_user_writev,
1071         .open = cifs_open,
1072         .release = cifs_close,
1073         .fsync = cifs_fsync,
1074         .flush = cifs_flush,
1075         .mmap = cifs_file_mmap,
1076         .splice_read = generic_file_splice_read,
1077         .unlocked_ioctl  = cifs_ioctl,
1078         .clone_file_range = cifs_clone_file_range,
1079         .llseek = cifs_llseek,
1080         .setlease = cifs_setlease,
1081         .fallocate = cifs_fallocate,
1082 };
1083 
1084 const struct file_operations cifs_dir_ops = {
1085         .iterate_shared = cifs_readdir,
1086         .release = cifs_closedir,
1087         .read    = generic_read_dir,
1088         .unlocked_ioctl  = cifs_ioctl,
1089         .clone_file_range = cifs_clone_file_range,
1090         .llseek = generic_file_llseek,
1091 };
1092 
1093 static void
1094 cifs_init_once(void *inode)
1095 {
1096         struct cifsInodeInfo *cifsi = inode;
1097 
1098         inode_init_once(&cifsi->vfs_inode);
1099         init_rwsem(&cifsi->lock_sem);
1100 }
1101 
1102 static int __init
1103 cifs_init_inodecache(void)
1104 {
1105         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1106                                               sizeof(struct cifsInodeInfo),
1107                                               0, (SLAB_RECLAIM_ACCOUNT|
1108                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1109                                               cifs_init_once);
1110         if (cifs_inode_cachep == NULL)
1111                 return -ENOMEM;
1112 
1113         return 0;
1114 }
1115 
1116 static void
1117 cifs_destroy_inodecache(void)
1118 {
1119         /*
1120          * Make sure all delayed rcu free inodes are flushed before we
1121          * destroy cache.
1122          */
1123         rcu_barrier();
1124         kmem_cache_destroy(cifs_inode_cachep);
1125 }
1126 
1127 static int
1128 cifs_init_request_bufs(void)
1129 {
1130         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1131 #ifdef CONFIG_CIFS_SMB2
1132         /*
1133          * SMB2 maximum header size is bigger than CIFS one - no problems to
1134          * allocate some more bytes for CIFS.
1135          */
1136         max_hdr_size = MAX_SMB2_HDR_SIZE;
1137 #endif
1138         if (CIFSMaxBufSize < 8192) {
1139         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1140         Unicode path name has to fit in any SMB/CIFS path based frames */
1141                 CIFSMaxBufSize = 8192;
1142         } else if (CIFSMaxBufSize > 1024*127) {
1143                 CIFSMaxBufSize = 1024 * 127;
1144         } else {
1145                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1146         }
1147 /*
1148         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1149                  CIFSMaxBufSize, CIFSMaxBufSize);
1150 */
1151         cifs_req_cachep = kmem_cache_create("cifs_request",
1152                                             CIFSMaxBufSize + max_hdr_size, 0,
1153                                             SLAB_HWCACHE_ALIGN, NULL);
1154         if (cifs_req_cachep == NULL)
1155                 return -ENOMEM;
1156 
1157         if (cifs_min_rcv < 1)
1158                 cifs_min_rcv = 1;
1159         else if (cifs_min_rcv > 64) {
1160                 cifs_min_rcv = 64;
1161                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1162         }
1163 
1164         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1165                                                   cifs_req_cachep);
1166 
1167         if (cifs_req_poolp == NULL) {
1168                 kmem_cache_destroy(cifs_req_cachep);
1169                 return -ENOMEM;
1170         }
1171         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1172         almost all handle based requests (but not write response, nor is it
1173         sufficient for path based requests).  A smaller size would have
1174         been more efficient (compacting multiple slab items on one 4k page)
1175         for the case in which debug was on, but this larger size allows
1176         more SMBs to use small buffer alloc and is still much more
1177         efficient to alloc 1 per page off the slab compared to 17K (5page)
1178         alloc of large cifs buffers even when page debugging is on */
1179         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1180                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1181                         NULL);
1182         if (cifs_sm_req_cachep == NULL) {
1183                 mempool_destroy(cifs_req_poolp);
1184                 kmem_cache_destroy(cifs_req_cachep);
1185                 return -ENOMEM;
1186         }
1187 
1188         if (cifs_min_small < 2)
1189                 cifs_min_small = 2;
1190         else if (cifs_min_small > 256) {
1191                 cifs_min_small = 256;
1192                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1193         }
1194 
1195         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1196                                                      cifs_sm_req_cachep);
1197 
1198         if (cifs_sm_req_poolp == NULL) {
1199                 mempool_destroy(cifs_req_poolp);
1200                 kmem_cache_destroy(cifs_req_cachep);
1201                 kmem_cache_destroy(cifs_sm_req_cachep);
1202                 return -ENOMEM;
1203         }
1204 
1205         return 0;
1206 }
1207 
1208 static void
1209 cifs_destroy_request_bufs(void)
1210 {
1211         mempool_destroy(cifs_req_poolp);
1212         kmem_cache_destroy(cifs_req_cachep);
1213         mempool_destroy(cifs_sm_req_poolp);
1214         kmem_cache_destroy(cifs_sm_req_cachep);
1215 }
1216 
1217 static int
1218 cifs_init_mids(void)
1219 {
1220         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1221                                             sizeof(struct mid_q_entry), 0,
1222                                             SLAB_HWCACHE_ALIGN, NULL);
1223         if (cifs_mid_cachep == NULL)
1224                 return -ENOMEM;
1225 
1226         /* 3 is a reasonable minimum number of simultaneous operations */
1227         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1228         if (cifs_mid_poolp == NULL) {
1229                 kmem_cache_destroy(cifs_mid_cachep);
1230                 return -ENOMEM;
1231         }
1232 
1233         return 0;
1234 }
1235 
1236 static void
1237 cifs_destroy_mids(void)
1238 {
1239         mempool_destroy(cifs_mid_poolp);
1240         kmem_cache_destroy(cifs_mid_cachep);
1241 }
1242 
1243 static int __init
1244 init_cifs(void)
1245 {
1246         int rc = 0;
1247         cifs_proc_init();
1248         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1249 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1250         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1251         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1252 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1253 /*
1254  *  Initialize Global counters
1255  */
1256         atomic_set(&sesInfoAllocCount, 0);
1257         atomic_set(&tconInfoAllocCount, 0);
1258         atomic_set(&tcpSesAllocCount, 0);
1259         atomic_set(&tcpSesReconnectCount, 0);
1260         atomic_set(&tconInfoReconnectCount, 0);
1261 
1262         atomic_set(&bufAllocCount, 0);
1263         atomic_set(&smBufAllocCount, 0);
1264 #ifdef CONFIG_CIFS_STATS2
1265         atomic_set(&totBufAllocCount, 0);
1266         atomic_set(&totSmBufAllocCount, 0);
1267 #endif /* CONFIG_CIFS_STATS2 */
1268 
1269         atomic_set(&midCount, 0);
1270         GlobalCurrentXid = 0;
1271         GlobalTotalActiveXid = 0;
1272         GlobalMaxActiveXid = 0;
1273         spin_lock_init(&cifs_tcp_ses_lock);
1274         spin_lock_init(&GlobalMid_Lock);
1275 
1276         get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1277 
1278         if (cifs_max_pending < 2) {
1279                 cifs_max_pending = 2;
1280                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1281         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1282                 cifs_max_pending = CIFS_MAX_REQ;
1283                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1284                          CIFS_MAX_REQ);
1285         }
1286 
1287         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1288         if (!cifsiod_wq) {
1289                 rc = -ENOMEM;
1290                 goto out_clean_proc;
1291         }
1292 
1293         rc = cifs_fscache_register();
1294         if (rc)
1295                 goto out_destroy_wq;
1296 
1297         rc = cifs_init_inodecache();
1298         if (rc)
1299                 goto out_unreg_fscache;
1300 
1301         rc = cifs_init_mids();
1302         if (rc)
1303                 goto out_destroy_inodecache;
1304 
1305         rc = cifs_init_request_bufs();
1306         if (rc)
1307                 goto out_destroy_mids;
1308 
1309 #ifdef CONFIG_CIFS_UPCALL
1310         rc = init_cifs_spnego();
1311         if (rc)
1312                 goto out_destroy_request_bufs;
1313 #endif /* CONFIG_CIFS_UPCALL */
1314 
1315 #ifdef CONFIG_CIFS_ACL
1316         rc = init_cifs_idmap();
1317         if (rc)
1318                 goto out_register_key_type;
1319 #endif /* CONFIG_CIFS_ACL */
1320 
1321         rc = register_filesystem(&cifs_fs_type);
1322         if (rc)
1323                 goto out_init_cifs_idmap;
1324 
1325         return 0;
1326 
1327 out_init_cifs_idmap:
1328 #ifdef CONFIG_CIFS_ACL
1329         exit_cifs_idmap();
1330 out_register_key_type:
1331 #endif
1332 #ifdef CONFIG_CIFS_UPCALL
1333         exit_cifs_spnego();
1334 out_destroy_request_bufs:
1335 #endif
1336         cifs_destroy_request_bufs();
1337 out_destroy_mids:
1338         cifs_destroy_mids();
1339 out_destroy_inodecache:
1340         cifs_destroy_inodecache();
1341 out_unreg_fscache:
1342         cifs_fscache_unregister();
1343 out_destroy_wq:
1344         destroy_workqueue(cifsiod_wq);
1345 out_clean_proc:
1346         cifs_proc_clean();
1347         return rc;
1348 }
1349 
1350 static void __exit
1351 exit_cifs(void)
1352 {
1353         cifs_dbg(NOISY, "exit_cifs\n");
1354         unregister_filesystem(&cifs_fs_type);
1355         cifs_dfs_release_automount_timer();
1356 #ifdef CONFIG_CIFS_ACL
1357         exit_cifs_idmap();
1358 #endif
1359 #ifdef CONFIG_CIFS_UPCALL
1360         unregister_key_type(&cifs_spnego_key_type);
1361 #endif
1362         cifs_destroy_request_bufs();
1363         cifs_destroy_mids();
1364         cifs_destroy_inodecache();
1365         cifs_fscache_unregister();
1366         destroy_workqueue(cifsiod_wq);
1367         cifs_proc_clean();
1368 }
1369 
1370 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1371 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1372 MODULE_DESCRIPTION
1373     ("VFS to access servers complying with the SNIA CIFS Specification "
1374      "e.g. Samba and Windows");
1375 MODULE_VERSION(CIFS_VERSION);
1376 module_init(init_cifs)
1377 module_exit(exit_cifs)
1378 

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