4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
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.
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.
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
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.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/uuid.h>
41 #include <linux/xattr.h>
45 #define DECLARE_GLOBALS_HERE
47 #include "cifsproto.h"
48 #include "cifs_debug.h"
49 #include "cifs_fs_sb.h"
51 #include <linux/key-type.h>
52 #include "cifs_spnego.h"
55 #ifdef CONFIG_CIFS_DFS_UPCALL
56 #include "dfs_cache.h"
58 #include "fs_context.h"
61 * DOS dates from 1980/1/1 through 2107/12/31
62 * Protocol specifications indicate the range should be to 119, which
63 * limits maximum year to 2099. But this range has not been checked.
65 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
66 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
67 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
71 bool enable_oplocks = true;
72 bool linuxExtEnabled = true;
73 bool lookupCacheEnabled = true;
74 bool disable_legacy_dialects; /* false by default */
75 bool enable_gcm_256; /* false by default, change when more servers support it */
76 bool require_gcm_256; /* false by default */
77 unsigned int global_secflags = CIFSSEC_DEF;
78 /* unsigned int ntlmv2_support = 0; */
79 unsigned int sign_CIFS_PDUs = 1;
80 static const struct super_operations cifs_super_ops;
81 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
82 module_param(CIFSMaxBufSize, uint, 0444);
83 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
85 "Default: 16384 Range: 8192 to 130048");
86 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
87 module_param(cifs_min_rcv, uint, 0444);
88 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
90 unsigned int cifs_min_small = 30;
91 module_param(cifs_min_small, uint, 0444);
92 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
94 unsigned int cifs_max_pending = CIFS_MAX_REQ;
95 module_param(cifs_max_pending, uint, 0444);
96 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
97 "CIFS/SMB1 dialect (N/A for SMB3) "
98 "Default: 32767 Range: 2 to 32767.");
99 #ifdef CONFIG_CIFS_STATS2
100 unsigned int slow_rsp_threshold = 1;
101 module_param(slow_rsp_threshold, uint, 0644);
102 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
103 "before logging that a response is delayed. "
104 "Default: 1 (if set to 0 disables msg).");
107 module_param(enable_oplocks, bool, 0644);
108 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
110 module_param(enable_gcm_256, bool, 0644);
111 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
113 module_param(require_gcm_256, bool, 0644);
114 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
116 module_param(disable_legacy_dialects, bool, 0644);
117 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
118 "helpful to restrict the ability to "
119 "override the default dialects (SMB2.1, "
120 "SMB3 and SMB3.02) on mount with old "
121 "dialects (CIFS/SMB1 and SMB2) since "
122 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
123 " and less secure. Default: n/N/0");
125 extern mempool_t *cifs_sm_req_poolp;
126 extern mempool_t *cifs_req_poolp;
127 extern mempool_t *cifs_mid_poolp;
129 struct workqueue_struct *cifsiod_wq;
130 struct workqueue_struct *decrypt_wq;
131 struct workqueue_struct *fileinfo_put_wq;
132 struct workqueue_struct *cifsoplockd_wq;
133 __u32 cifs_lock_secret;
136 * Bumps refcount for cifs super block.
137 * Note that it should be only called if a referece to VFS super block is
138 * already held, e.g. in open-type syscalls context. Otherwise it can race with
139 * atomic_dec_and_test in deactivate_locked_super.
142 cifs_sb_active(struct super_block *sb)
144 struct cifs_sb_info *server = CIFS_SB(sb);
146 if (atomic_inc_return(&server->active) == 1)
147 atomic_inc(&sb->s_active);
151 cifs_sb_deactive(struct super_block *sb)
153 struct cifs_sb_info *server = CIFS_SB(sb);
155 if (atomic_dec_and_test(&server->active))
156 deactivate_super(sb);
160 cifs_read_super(struct super_block *sb)
163 struct cifs_sb_info *cifs_sb;
164 struct cifs_tcon *tcon;
165 struct timespec64 ts;
168 cifs_sb = CIFS_SB(sb);
169 tcon = cifs_sb_master_tcon(cifs_sb);
171 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
172 sb->s_flags |= SB_POSIXACL;
174 if (tcon->snapshot_time)
175 sb->s_flags |= SB_RDONLY;
177 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
178 sb->s_maxbytes = MAX_LFS_FILESIZE;
180 sb->s_maxbytes = MAX_NON_LFS;
183 * Some very old servers like DOS and OS/2 used 2 second granularity
184 * (while all current servers use 100ns granularity - see MS-DTYP)
185 * but 1 second is the maximum allowed granularity for the VFS
186 * so for old servers set time granularity to 1 second while for
187 * everything else (current servers) set it to 100ns.
189 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
190 ((tcon->ses->capabilities &
191 tcon->ses->server->vals->cap_nt_find) == 0) &&
193 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
194 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
195 sb->s_time_min = ts.tv_sec;
196 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
197 cpu_to_le16(SMB_TIME_MAX), 0);
198 sb->s_time_max = ts.tv_sec;
201 * Almost every server, including all SMB2+, uses DCE TIME
202 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
204 sb->s_time_gran = 100;
205 ts = cifs_NTtimeToUnix(0);
206 sb->s_time_min = ts.tv_sec;
207 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
208 sb->s_time_max = ts.tv_sec;
211 sb->s_magic = CIFS_MAGIC_NUMBER;
212 sb->s_op = &cifs_super_ops;
213 sb->s_xattr = cifs_xattr_handlers;
214 rc = super_setup_bdi(sb);
217 /* tune readahead according to rsize */
218 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
220 sb->s_blocksize = CIFS_MAX_MSGSIZE;
221 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
222 inode = cifs_root_iget(sb);
230 sb->s_d_op = &cifs_ci_dentry_ops;
232 sb->s_d_op = &cifs_dentry_ops;
234 sb->s_root = d_make_root(inode);
240 #ifdef CONFIG_CIFS_NFSD_EXPORT
241 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
242 cifs_dbg(FYI, "export ops supported\n");
243 sb->s_export_op = &cifs_export_ops;
245 #endif /* CONFIG_CIFS_NFSD_EXPORT */
250 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
254 static void cifs_kill_sb(struct super_block *sb)
256 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
258 cifs_umount(cifs_sb);
262 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
264 struct super_block *sb = dentry->d_sb;
265 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
266 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
267 struct TCP_Server_Info *server = tcon->ses->server;
273 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
275 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
277 buf->f_namelen = PATH_MAX;
279 buf->f_fsid.val[0] = tcon->vol_serial_number;
280 /* are using part of create time for more randomness, see man statfs */
281 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
283 buf->f_files = 0; /* undefined */
284 buf->f_ffree = 0; /* unlimited */
286 if (server->ops->queryfs)
287 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
293 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
295 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
296 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
297 struct TCP_Server_Info *server = tcon->ses->server;
299 if (server->ops->fallocate)
300 return server->ops->fallocate(file, tcon, mode, off, len);
305 static int cifs_permission(struct inode *inode, int mask)
307 struct cifs_sb_info *cifs_sb;
309 cifs_sb = CIFS_SB(inode->i_sb);
311 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
312 if ((mask & MAY_EXEC) && !execute_ok(inode))
316 } else /* file mode might have been restricted at mount time
317 on the client (above and beyond ACL on servers) for
318 servers which do not support setting and viewing mode bits,
319 so allowing client to check permissions is useful */
320 return generic_permission(inode, mask);
323 static struct kmem_cache *cifs_inode_cachep;
324 static struct kmem_cache *cifs_req_cachep;
325 static struct kmem_cache *cifs_mid_cachep;
326 static struct kmem_cache *cifs_sm_req_cachep;
327 mempool_t *cifs_sm_req_poolp;
328 mempool_t *cifs_req_poolp;
329 mempool_t *cifs_mid_poolp;
331 static struct inode *
332 cifs_alloc_inode(struct super_block *sb)
334 struct cifsInodeInfo *cifs_inode;
335 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
338 cifs_inode->cifsAttrs = 0x20; /* default */
339 cifs_inode->time = 0;
341 * Until the file is open and we have gotten oplock info back from the
342 * server, can not assume caching of file data or metadata.
344 cifs_set_oplock_level(cifs_inode, 0);
345 cifs_inode->flags = 0;
346 spin_lock_init(&cifs_inode->writers_lock);
347 cifs_inode->writers = 0;
348 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
349 cifs_inode->server_eof = 0;
350 cifs_inode->uniqueid = 0;
351 cifs_inode->createtime = 0;
352 cifs_inode->epoch = 0;
353 spin_lock_init(&cifs_inode->open_file_lock);
354 generate_random_uuid(cifs_inode->lease_key);
357 * Can not set i_flags here - they get immediately overwritten to zero
360 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
361 INIT_LIST_HEAD(&cifs_inode->openFileList);
362 INIT_LIST_HEAD(&cifs_inode->llist);
363 return &cifs_inode->vfs_inode;
367 cifs_free_inode(struct inode *inode)
369 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
373 cifs_evict_inode(struct inode *inode)
375 truncate_inode_pages_final(&inode->i_data);
377 cifs_fscache_release_inode_cookie(inode);
381 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
383 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
384 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
386 seq_puts(s, ",addr=");
388 switch (server->dstaddr.ss_family) {
390 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
393 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
394 if (sa6->sin6_scope_id)
395 seq_printf(s, "%%%u", sa6->sin6_scope_id);
398 seq_puts(s, "(unknown)");
401 seq_puts(s, ",rdma");
405 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
407 if (ses->sectype == Unspecified) {
408 if (ses->user_name == NULL)
409 seq_puts(s, ",sec=none");
413 seq_puts(s, ",sec=");
415 switch (ses->sectype) {
417 seq_puts(s, "lanman");
420 seq_puts(s, "ntlmv2");
429 seq_puts(s, "ntlmssp");
432 /* shouldn't ever happen */
433 seq_puts(s, "unknown");
440 if (ses->sectype == Kerberos)
441 seq_printf(s, ",cruid=%u",
442 from_kuid_munged(&init_user_ns, ses->cred_uid));
446 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
448 seq_puts(s, ",cache=");
450 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
451 seq_puts(s, "strict");
452 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
454 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
455 seq_puts(s, "singleclient"); /* assume only one client access */
456 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
457 seq_puts(s, "ro"); /* read only caching assumed */
459 seq_puts(s, "loose");
463 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
465 struct nls_table *def;
467 /* Display iocharset= option if it's not default charset */
468 def = load_nls_default();
470 seq_printf(s, ",iocharset=%s", cur->charset);
475 * cifs_show_options() is for displaying mount options in /proc/mounts.
476 * Not all settable options are displayed but most of the important
480 cifs_show_options(struct seq_file *s, struct dentry *root)
482 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
483 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
484 struct sockaddr *srcaddr;
485 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
487 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
488 cifs_show_security(s, tcon->ses);
489 cifs_show_cache_flavor(s, cifs_sb);
492 seq_puts(s, ",nolease");
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
494 seq_puts(s, ",multiuser");
495 else if (tcon->ses->user_name)
496 seq_show_option(s, "username", tcon->ses->user_name);
498 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
499 seq_show_option(s, "domain", tcon->ses->domainName);
501 if (srcaddr->sa_family != AF_UNSPEC) {
502 struct sockaddr_in *saddr4;
503 struct sockaddr_in6 *saddr6;
504 saddr4 = (struct sockaddr_in *)srcaddr;
505 saddr6 = (struct sockaddr_in6 *)srcaddr;
506 if (srcaddr->sa_family == AF_INET6)
507 seq_printf(s, ",srcaddr=%pI6c",
509 else if (srcaddr->sa_family == AF_INET)
510 seq_printf(s, ",srcaddr=%pI4",
511 &saddr4->sin_addr.s_addr);
513 seq_printf(s, ",srcaddr=BAD-AF:%i",
514 (int)(srcaddr->sa_family));
517 seq_printf(s, ",uid=%u",
518 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
519 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
520 seq_puts(s, ",forceuid");
522 seq_puts(s, ",noforceuid");
524 seq_printf(s, ",gid=%u",
525 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
526 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
527 seq_puts(s, ",forcegid");
529 seq_puts(s, ",noforcegid");
531 cifs_show_address(s, tcon->ses->server);
534 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
535 cifs_sb->mnt_file_mode,
536 cifs_sb->mnt_dir_mode);
538 cifs_show_nls(s, cifs_sb->local_nls);
541 seq_puts(s, ",seal");
542 else if (tcon->ses->server->ignore_signature)
543 seq_puts(s, ",signloosely");
545 seq_puts(s, ",nocase");
547 seq_puts(s, ",nodelete");
548 if (tcon->local_lease)
549 seq_puts(s, ",locallease");
551 seq_puts(s, ",hard");
553 seq_puts(s, ",soft");
554 if (tcon->use_persistent)
555 seq_puts(s, ",persistenthandles");
556 else if (tcon->use_resilient)
557 seq_puts(s, ",resilienthandles");
558 if (tcon->posix_extensions)
559 seq_puts(s, ",posix");
560 else if (tcon->unix_ext)
561 seq_puts(s, ",unix");
563 seq_puts(s, ",nounix");
564 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
565 seq_puts(s, ",nodfs");
566 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
567 seq_puts(s, ",posixpaths");
568 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
569 seq_puts(s, ",setuids");
570 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
571 seq_puts(s, ",idsfromsid");
572 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
573 seq_puts(s, ",serverino");
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
575 seq_puts(s, ",rwpidforward");
576 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
577 seq_puts(s, ",forcemand");
578 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
579 seq_puts(s, ",nouser_xattr");
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
581 seq_puts(s, ",mapchars");
582 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
583 seq_puts(s, ",mapposix");
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
586 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
587 seq_puts(s, ",nobrl");
588 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
589 seq_puts(s, ",nohandlecache");
590 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
591 seq_puts(s, ",modefromsid");
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
593 seq_puts(s, ",cifsacl");
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
595 seq_puts(s, ",dynperm");
596 if (root->d_sb->s_flags & SB_POSIXACL)
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
599 seq_puts(s, ",mfsymlinks");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
603 seq_puts(s, ",nostrictsync");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
605 seq_puts(s, ",noperm");
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
607 seq_printf(s, ",backupuid=%u",
608 from_kuid_munged(&init_user_ns,
609 cifs_sb->mnt_backupuid));
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
611 seq_printf(s, ",backupgid=%u",
612 from_kgid_munged(&init_user_ns,
613 cifs_sb->mnt_backupgid));
615 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
616 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
617 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
618 if (tcon->ses->server->min_offload)
619 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
620 seq_printf(s, ",echo_interval=%lu",
621 tcon->ses->server->echo_interval / HZ);
623 /* Only display max_credits if it was overridden on mount */
624 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
625 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
627 if (tcon->snapshot_time)
628 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
629 if (tcon->handle_timeout)
630 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
631 /* convert actimeo and display it in seconds */
632 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
634 if (tcon->ses->chan_max > 1)
635 seq_printf(s, ",multichannel,max_channels=%zu",
636 tcon->ses->chan_max);
641 static void cifs_umount_begin(struct super_block *sb)
643 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
644 struct cifs_tcon *tcon;
649 tcon = cifs_sb_master_tcon(cifs_sb);
651 spin_lock(&cifs_tcp_ses_lock);
652 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
653 /* we have other mounts to same share or we have
654 already tried to force umount this and woken up
655 all waiting network requests, nothing to do */
656 spin_unlock(&cifs_tcp_ses_lock);
658 } else if (tcon->tc_count == 1)
659 tcon->tidStatus = CifsExiting;
660 spin_unlock(&cifs_tcp_ses_lock);
662 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
663 /* cancel_notify_requests(tcon); */
664 if (tcon->ses && tcon->ses->server) {
665 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
666 wake_up_all(&tcon->ses->server->request_q);
667 wake_up_all(&tcon->ses->server->response_q);
668 msleep(1); /* yield */
669 /* we have to kick the requests once more */
670 wake_up_all(&tcon->ses->server->response_q);
677 #ifdef CONFIG_CIFS_STATS2
678 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
685 static int cifs_drop_inode(struct inode *inode)
687 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
689 /* no serverino => unconditional eviction */
690 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
691 generic_drop_inode(inode);
694 static const struct super_operations cifs_super_ops = {
695 .statfs = cifs_statfs,
696 .alloc_inode = cifs_alloc_inode,
697 .free_inode = cifs_free_inode,
698 .drop_inode = cifs_drop_inode,
699 .evict_inode = cifs_evict_inode,
700 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
701 function unless later we add lazy close of inodes or unless the
702 kernel forgets to call us with the same number of releases (closes)
704 .show_options = cifs_show_options,
705 .umount_begin = cifs_umount_begin,
706 #ifdef CONFIG_CIFS_STATS2
707 .show_stats = cifs_show_stats,
712 * Get root dentry from superblock according to prefix path mount option.
713 * Return dentry with refcount + 1 on success and NULL otherwise.
715 static struct dentry *
716 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
718 struct dentry *dentry;
719 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
720 char *full_path = NULL;
724 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
725 return dget(sb->s_root);
727 full_path = cifs_build_path_to_root(ctx, cifs_sb,
728 cifs_sb_master_tcon(cifs_sb), 0);
729 if (full_path == NULL)
730 return ERR_PTR(-ENOMEM);
732 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
734 sep = CIFS_DIR_SEP(cifs_sb);
735 dentry = dget(sb->s_root);
739 struct inode *dir = d_inode(dentry);
740 struct dentry *child;
742 if (!S_ISDIR(dir->i_mode)) {
744 dentry = ERR_PTR(-ENOTDIR);
748 /* skip separators */
755 while (*s && *s != sep)
758 child = lookup_positive_unlocked(p, dentry, s - p);
761 } while (!IS_ERR(dentry));
766 static int cifs_set_super(struct super_block *sb, void *data)
768 struct cifs_mnt_data *mnt_data = data;
769 sb->s_fs_info = mnt_data->cifs_sb;
770 return set_anon_super(sb, NULL);
774 cifs_smb3_do_mount(struct file_system_type *fs_type,
775 int flags, struct smb3_fs_context *old_ctx)
778 struct super_block *sb;
779 struct cifs_sb_info *cifs_sb;
780 struct smb3_fs_context *ctx;
781 struct cifs_mnt_data mnt_data;
785 * Prints in Kernel / CIFS log the attempted mount operation
786 * If CIFS_DEBUG && cifs_FYI
789 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
791 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
793 ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
795 return ERR_PTR(-ENOMEM);
796 rc = smb3_fs_context_dup(ctx, old_ctx);
802 rc = cifs_setup_volume_info(ctx);
808 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
809 if (cifs_sb == NULL) {
810 root = ERR_PTR(-ENOMEM);
814 cifs_sb->mountdata = kstrndup(ctx->mount_options, PAGE_SIZE, GFP_KERNEL);
815 if (cifs_sb->mountdata == NULL) {
816 root = ERR_PTR(-ENOMEM);
820 rc = cifs_setup_cifs_sb(ctx, cifs_sb);
826 rc = cifs_mount(cifs_sb, ctx);
828 if (!(flags & SB_SILENT))
829 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
836 mnt_data.cifs_sb = cifs_sb;
837 mnt_data.flags = flags;
839 /* BB should we make this contingent on mount parm? */
840 flags |= SB_NODIRATIME | SB_NOATIME;
842 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
845 cifs_umount(cifs_sb);
850 cifs_dbg(FYI, "Use existing superblock\n");
851 cifs_umount(cifs_sb);
853 rc = cifs_read_super(sb);
859 sb->s_flags |= SB_ACTIVE;
862 root = cifs_get_root(ctx, sb);
866 cifs_dbg(FYI, "dentry root is: %p\n", root);
870 deactivate_locked_super(sb);
872 cifs_cleanup_volume_info(ctx);
876 kfree(cifs_sb->prepath);
877 kfree(cifs_sb->mountdata);
880 unload_nls(ctx->local_nls);
886 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
889 struct inode *inode = file_inode(iocb->ki_filp);
891 if (iocb->ki_filp->f_flags & O_DIRECT)
892 return cifs_user_readv(iocb, iter);
894 rc = cifs_revalidate_mapping(inode);
898 return generic_file_read_iter(iocb, iter);
901 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
903 struct inode *inode = file_inode(iocb->ki_filp);
904 struct cifsInodeInfo *cinode = CIFS_I(inode);
908 if (iocb->ki_filp->f_flags & O_DIRECT) {
909 written = cifs_user_writev(iocb, from);
910 if (written > 0 && CIFS_CACHE_READ(cinode)) {
911 cifs_zap_mapping(inode);
913 "Set no oplock for inode=%p after a write operation\n",
920 written = cifs_get_writer(cinode);
924 written = generic_file_write_iter(iocb, from);
926 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
929 rc = filemap_fdatawrite(inode->i_mapping);
931 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
935 cifs_put_writer(cinode);
939 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
941 struct cifsFileInfo *cfile = file->private_data;
942 struct cifs_tcon *tcon;
945 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
946 * the cached file length
948 if (whence != SEEK_SET && whence != SEEK_CUR) {
950 struct inode *inode = file_inode(file);
953 * We need to be sure that all dirty pages are written and the
954 * server has the newest file length.
956 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
957 inode->i_mapping->nrpages != 0) {
958 rc = filemap_fdatawait(inode->i_mapping);
960 mapping_set_error(inode->i_mapping, rc);
965 * Some applications poll for the file length in this strange
966 * way so we must seek to end on non-oplocked files by
967 * setting the revalidate time to zero.
969 CIFS_I(inode)->time = 0;
971 rc = cifs_revalidate_file_attr(file);
975 if (cfile && cfile->tlink) {
976 tcon = tlink_tcon(cfile->tlink);
977 if (tcon->ses->server->ops->llseek)
978 return tcon->ses->server->ops->llseek(file, tcon,
981 return generic_file_llseek(file, offset, whence);
985 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
988 * Note that this is called by vfs setlease with i_lock held to
989 * protect *lease from going away.
991 struct inode *inode = file_inode(file);
992 struct cifsFileInfo *cfile = file->private_data;
994 if (!(S_ISREG(inode->i_mode)))
997 /* Check if file is oplocked if this is request for new lease */
998 if (arg == F_UNLCK ||
999 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1000 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1001 return generic_setlease(file, arg, lease, priv);
1002 else if (tlink_tcon(cfile->tlink)->local_lease &&
1003 !CIFS_CACHE_READ(CIFS_I(inode)))
1005 * If the server claims to support oplock on this file, then we
1006 * still need to check oplock even if the local_lease mount
1007 * option is set, but there are servers which do not support
1008 * oplock for which this mount option may be useful if the user
1009 * knows that the file won't be changed on the server by anyone
1012 return generic_setlease(file, arg, lease, priv);
1017 struct file_system_type cifs_fs_type = {
1018 .owner = THIS_MODULE,
1020 .init_fs_context = smb3_init_fs_context,
1021 .parameters = smb3_fs_parameters,
1022 .kill_sb = cifs_kill_sb,
1023 .fs_flags = FS_RENAME_DOES_D_MOVE,
1025 MODULE_ALIAS_FS("cifs");
1027 static struct file_system_type smb3_fs_type = {
1028 .owner = THIS_MODULE,
1030 .init_fs_context = smb3_init_fs_context,
1031 .parameters = smb3_fs_parameters,
1032 .kill_sb = cifs_kill_sb,
1033 .fs_flags = FS_RENAME_DOES_D_MOVE,
1035 MODULE_ALIAS_FS("smb3");
1036 MODULE_ALIAS("smb3");
1038 const struct inode_operations cifs_dir_inode_ops = {
1039 .create = cifs_create,
1040 .atomic_open = cifs_atomic_open,
1041 .lookup = cifs_lookup,
1042 .getattr = cifs_getattr,
1043 .unlink = cifs_unlink,
1044 .link = cifs_hardlink,
1045 .mkdir = cifs_mkdir,
1046 .rmdir = cifs_rmdir,
1047 .rename = cifs_rename2,
1048 .permission = cifs_permission,
1049 .setattr = cifs_setattr,
1050 .symlink = cifs_symlink,
1051 .mknod = cifs_mknod,
1052 .listxattr = cifs_listxattr,
1055 const struct inode_operations cifs_file_inode_ops = {
1056 .setattr = cifs_setattr,
1057 .getattr = cifs_getattr,
1058 .permission = cifs_permission,
1059 .listxattr = cifs_listxattr,
1060 .fiemap = cifs_fiemap,
1063 const struct inode_operations cifs_symlink_inode_ops = {
1064 .get_link = cifs_get_link,
1065 .permission = cifs_permission,
1066 .listxattr = cifs_listxattr,
1069 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1070 struct file *dst_file, loff_t destoff, loff_t len,
1071 unsigned int remap_flags)
1073 struct inode *src_inode = file_inode(src_file);
1074 struct inode *target_inode = file_inode(dst_file);
1075 struct cifsFileInfo *smb_file_src = src_file->private_data;
1076 struct cifsFileInfo *smb_file_target;
1077 struct cifs_tcon *target_tcon;
1081 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1084 cifs_dbg(FYI, "clone range\n");
1088 if (!src_file->private_data || !dst_file->private_data) {
1090 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1094 smb_file_target = dst_file->private_data;
1095 target_tcon = tlink_tcon(smb_file_target->tlink);
1098 * Note: cifs case is easier than btrfs since server responsible for
1099 * checks for proper open modes and file type and if it wants
1100 * server could even support copy of range where source = target
1102 lock_two_nondirectories(target_inode, src_inode);
1105 len = src_inode->i_size - off;
1107 cifs_dbg(FYI, "about to flush pages\n");
1108 /* should we flush first and last page first */
1109 truncate_inode_pages_range(&target_inode->i_data, destoff,
1110 PAGE_ALIGN(destoff + len)-1);
1112 if (target_tcon->ses->server->ops->duplicate_extents)
1113 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1114 smb_file_src, smb_file_target, off, len, destoff);
1118 /* force revalidate of size and timestamps of target file now
1119 that target is updated on the server */
1120 CIFS_I(target_inode)->time = 0;
1121 /* although unlocking in the reverse order from locking is not
1122 strictly necessary here it is a little cleaner to be consistent */
1123 unlock_two_nondirectories(src_inode, target_inode);
1126 return rc < 0 ? rc : len;
1129 ssize_t cifs_file_copychunk_range(unsigned int xid,
1130 struct file *src_file, loff_t off,
1131 struct file *dst_file, loff_t destoff,
1132 size_t len, unsigned int flags)
1134 struct inode *src_inode = file_inode(src_file);
1135 struct inode *target_inode = file_inode(dst_file);
1136 struct cifsFileInfo *smb_file_src;
1137 struct cifsFileInfo *smb_file_target;
1138 struct cifs_tcon *src_tcon;
1139 struct cifs_tcon *target_tcon;
1142 cifs_dbg(FYI, "copychunk range\n");
1144 if (!src_file->private_data || !dst_file->private_data) {
1146 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1151 smb_file_target = dst_file->private_data;
1152 smb_file_src = src_file->private_data;
1153 src_tcon = tlink_tcon(smb_file_src->tlink);
1154 target_tcon = tlink_tcon(smb_file_target->tlink);
1156 if (src_tcon->ses != target_tcon->ses) {
1157 cifs_dbg(VFS, "source and target of copy not on same server\n");
1162 if (!target_tcon->ses->server->ops->copychunk_range)
1166 * Note: cifs case is easier than btrfs since server responsible for
1167 * checks for proper open modes and file type and if it wants
1168 * server could even support copy of range where source = target
1170 lock_two_nondirectories(target_inode, src_inode);
1172 cifs_dbg(FYI, "about to flush pages\n");
1173 /* should we flush first and last page first */
1174 truncate_inode_pages(&target_inode->i_data, 0);
1176 rc = file_modified(dst_file);
1178 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1179 smb_file_src, smb_file_target, off, len, destoff);
1181 file_accessed(src_file);
1183 /* force revalidate of size and timestamps of target file now
1184 * that target is updated on the server
1186 CIFS_I(target_inode)->time = 0;
1187 /* although unlocking in the reverse order from locking is not
1188 * strictly necessary here it is a little cleaner to be consistent
1190 unlock_two_nondirectories(src_inode, target_inode);
1197 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1198 * is a dummy operation.
1200 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1202 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1208 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1209 struct file *dst_file, loff_t destoff,
1210 size_t len, unsigned int flags)
1212 unsigned int xid = get_xid();
1214 struct cifsFileInfo *cfile = dst_file->private_data;
1216 if (cfile->swapfile)
1219 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1223 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1224 rc = generic_copy_file_range(src_file, off, dst_file,
1225 destoff, len, flags);
1229 const struct file_operations cifs_file_ops = {
1230 .read_iter = cifs_loose_read_iter,
1231 .write_iter = cifs_file_write_iter,
1233 .release = cifs_close,
1235 .flock = cifs_flock,
1236 .fsync = cifs_fsync,
1237 .flush = cifs_flush,
1238 .mmap = cifs_file_mmap,
1239 .splice_read = generic_file_splice_read,
1240 .splice_write = iter_file_splice_write,
1241 .llseek = cifs_llseek,
1242 .unlocked_ioctl = cifs_ioctl,
1243 .copy_file_range = cifs_copy_file_range,
1244 .remap_file_range = cifs_remap_file_range,
1245 .setlease = cifs_setlease,
1246 .fallocate = cifs_fallocate,
1249 const struct file_operations cifs_file_strict_ops = {
1250 .read_iter = cifs_strict_readv,
1251 .write_iter = cifs_strict_writev,
1253 .release = cifs_close,
1255 .flock = cifs_flock,
1256 .fsync = cifs_strict_fsync,
1257 .flush = cifs_flush,
1258 .mmap = cifs_file_strict_mmap,
1259 .splice_read = generic_file_splice_read,
1260 .splice_write = iter_file_splice_write,
1261 .llseek = cifs_llseek,
1262 .unlocked_ioctl = cifs_ioctl,
1263 .copy_file_range = cifs_copy_file_range,
1264 .remap_file_range = cifs_remap_file_range,
1265 .setlease = cifs_setlease,
1266 .fallocate = cifs_fallocate,
1269 const struct file_operations cifs_file_direct_ops = {
1270 .read_iter = cifs_direct_readv,
1271 .write_iter = cifs_direct_writev,
1273 .release = cifs_close,
1275 .flock = cifs_flock,
1276 .fsync = cifs_fsync,
1277 .flush = cifs_flush,
1278 .mmap = cifs_file_mmap,
1279 .splice_read = generic_file_splice_read,
1280 .splice_write = iter_file_splice_write,
1281 .unlocked_ioctl = cifs_ioctl,
1282 .copy_file_range = cifs_copy_file_range,
1283 .remap_file_range = cifs_remap_file_range,
1284 .llseek = cifs_llseek,
1285 .setlease = cifs_setlease,
1286 .fallocate = cifs_fallocate,
1289 const struct file_operations cifs_file_nobrl_ops = {
1290 .read_iter = cifs_loose_read_iter,
1291 .write_iter = cifs_file_write_iter,
1293 .release = cifs_close,
1294 .fsync = cifs_fsync,
1295 .flush = cifs_flush,
1296 .mmap = cifs_file_mmap,
1297 .splice_read = generic_file_splice_read,
1298 .splice_write = iter_file_splice_write,
1299 .llseek = cifs_llseek,
1300 .unlocked_ioctl = cifs_ioctl,
1301 .copy_file_range = cifs_copy_file_range,
1302 .remap_file_range = cifs_remap_file_range,
1303 .setlease = cifs_setlease,
1304 .fallocate = cifs_fallocate,
1307 const struct file_operations cifs_file_strict_nobrl_ops = {
1308 .read_iter = cifs_strict_readv,
1309 .write_iter = cifs_strict_writev,
1311 .release = cifs_close,
1312 .fsync = cifs_strict_fsync,
1313 .flush = cifs_flush,
1314 .mmap = cifs_file_strict_mmap,
1315 .splice_read = generic_file_splice_read,
1316 .splice_write = iter_file_splice_write,
1317 .llseek = cifs_llseek,
1318 .unlocked_ioctl = cifs_ioctl,
1319 .copy_file_range = cifs_copy_file_range,
1320 .remap_file_range = cifs_remap_file_range,
1321 .setlease = cifs_setlease,
1322 .fallocate = cifs_fallocate,
1325 const struct file_operations cifs_file_direct_nobrl_ops = {
1326 .read_iter = cifs_direct_readv,
1327 .write_iter = cifs_direct_writev,
1329 .release = cifs_close,
1330 .fsync = cifs_fsync,
1331 .flush = cifs_flush,
1332 .mmap = cifs_file_mmap,
1333 .splice_read = generic_file_splice_read,
1334 .splice_write = iter_file_splice_write,
1335 .unlocked_ioctl = cifs_ioctl,
1336 .copy_file_range = cifs_copy_file_range,
1337 .remap_file_range = cifs_remap_file_range,
1338 .llseek = cifs_llseek,
1339 .setlease = cifs_setlease,
1340 .fallocate = cifs_fallocate,
1343 const struct file_operations cifs_dir_ops = {
1344 .iterate_shared = cifs_readdir,
1345 .release = cifs_closedir,
1346 .read = generic_read_dir,
1347 .unlocked_ioctl = cifs_ioctl,
1348 .copy_file_range = cifs_copy_file_range,
1349 .remap_file_range = cifs_remap_file_range,
1350 .llseek = generic_file_llseek,
1351 .fsync = cifs_dir_fsync,
1355 cifs_init_once(void *inode)
1357 struct cifsInodeInfo *cifsi = inode;
1359 inode_init_once(&cifsi->vfs_inode);
1360 init_rwsem(&cifsi->lock_sem);
1364 cifs_init_inodecache(void)
1366 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1367 sizeof(struct cifsInodeInfo),
1368 0, (SLAB_RECLAIM_ACCOUNT|
1369 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1371 if (cifs_inode_cachep == NULL)
1378 cifs_destroy_inodecache(void)
1381 * Make sure all delayed rcu free inodes are flushed before we
1385 kmem_cache_destroy(cifs_inode_cachep);
1389 cifs_init_request_bufs(void)
1392 * SMB2 maximum header size is bigger than CIFS one - no problems to
1393 * allocate some more bytes for CIFS.
1395 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1397 if (CIFSMaxBufSize < 8192) {
1398 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1399 Unicode path name has to fit in any SMB/CIFS path based frames */
1400 CIFSMaxBufSize = 8192;
1401 } else if (CIFSMaxBufSize > 1024*127) {
1402 CIFSMaxBufSize = 1024 * 127;
1404 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1407 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1408 CIFSMaxBufSize, CIFSMaxBufSize);
1410 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1411 CIFSMaxBufSize + max_hdr_size, 0,
1412 SLAB_HWCACHE_ALIGN, 0,
1413 CIFSMaxBufSize + max_hdr_size,
1415 if (cifs_req_cachep == NULL)
1418 if (cifs_min_rcv < 1)
1420 else if (cifs_min_rcv > 64) {
1422 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1425 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1428 if (cifs_req_poolp == NULL) {
1429 kmem_cache_destroy(cifs_req_cachep);
1432 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1433 almost all handle based requests (but not write response, nor is it
1434 sufficient for path based requests). A smaller size would have
1435 been more efficient (compacting multiple slab items on one 4k page)
1436 for the case in which debug was on, but this larger size allows
1437 more SMBs to use small buffer alloc and is still much more
1438 efficient to alloc 1 per page off the slab compared to 17K (5page)
1439 alloc of large cifs buffers even when page debugging is on */
1440 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1441 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1442 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1443 if (cifs_sm_req_cachep == NULL) {
1444 mempool_destroy(cifs_req_poolp);
1445 kmem_cache_destroy(cifs_req_cachep);
1449 if (cifs_min_small < 2)
1451 else if (cifs_min_small > 256) {
1452 cifs_min_small = 256;
1453 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1456 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1457 cifs_sm_req_cachep);
1459 if (cifs_sm_req_poolp == NULL) {
1460 mempool_destroy(cifs_req_poolp);
1461 kmem_cache_destroy(cifs_req_cachep);
1462 kmem_cache_destroy(cifs_sm_req_cachep);
1470 cifs_destroy_request_bufs(void)
1472 mempool_destroy(cifs_req_poolp);
1473 kmem_cache_destroy(cifs_req_cachep);
1474 mempool_destroy(cifs_sm_req_poolp);
1475 kmem_cache_destroy(cifs_sm_req_cachep);
1479 cifs_init_mids(void)
1481 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1482 sizeof(struct mid_q_entry), 0,
1483 SLAB_HWCACHE_ALIGN, NULL);
1484 if (cifs_mid_cachep == NULL)
1487 /* 3 is a reasonable minimum number of simultaneous operations */
1488 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1489 if (cifs_mid_poolp == NULL) {
1490 kmem_cache_destroy(cifs_mid_cachep);
1498 cifs_destroy_mids(void)
1500 mempool_destroy(cifs_mid_poolp);
1501 kmem_cache_destroy(cifs_mid_cachep);
1509 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1510 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1511 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1512 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1513 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1515 * Initialize Global counters
1517 atomic_set(&sesInfoAllocCount, 0);
1518 atomic_set(&tconInfoAllocCount, 0);
1519 atomic_set(&tcpSesAllocCount, 0);
1520 atomic_set(&tcpSesReconnectCount, 0);
1521 atomic_set(&tconInfoReconnectCount, 0);
1523 atomic_set(&bufAllocCount, 0);
1524 atomic_set(&smBufAllocCount, 0);
1525 #ifdef CONFIG_CIFS_STATS2
1526 atomic_set(&totBufAllocCount, 0);
1527 atomic_set(&totSmBufAllocCount, 0);
1528 if (slow_rsp_threshold < 1)
1529 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1530 else if (slow_rsp_threshold > 32767)
1532 "slow response threshold set higher than recommended (0 to 32767)\n");
1533 #endif /* CONFIG_CIFS_STATS2 */
1535 atomic_set(&midCount, 0);
1536 GlobalCurrentXid = 0;
1537 GlobalTotalActiveXid = 0;
1538 GlobalMaxActiveXid = 0;
1539 spin_lock_init(&cifs_tcp_ses_lock);
1540 spin_lock_init(&GlobalMid_Lock);
1542 cifs_lock_secret = get_random_u32();
1544 if (cifs_max_pending < 2) {
1545 cifs_max_pending = 2;
1546 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1547 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1548 cifs_max_pending = CIFS_MAX_REQ;
1549 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1553 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1556 goto out_clean_proc;
1560 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1561 * so that we don't launch too many worker threads but
1562 * Documentation/core-api/workqueue.rst recommends setting it to 0
1565 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1566 decrypt_wq = alloc_workqueue("smb3decryptd",
1567 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1570 goto out_destroy_cifsiod_wq;
1573 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1574 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1575 if (!fileinfo_put_wq) {
1577 goto out_destroy_decrypt_wq;
1580 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1581 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1582 if (!cifsoplockd_wq) {
1584 goto out_destroy_fileinfo_put_wq;
1587 rc = cifs_fscache_register();
1589 goto out_destroy_cifsoplockd_wq;
1591 rc = cifs_init_inodecache();
1593 goto out_unreg_fscache;
1595 rc = cifs_init_mids();
1597 goto out_destroy_inodecache;
1599 rc = cifs_init_request_bufs();
1601 goto out_destroy_mids;
1603 #ifdef CONFIG_CIFS_DFS_UPCALL
1604 rc = dfs_cache_init();
1606 goto out_destroy_request_bufs;
1607 #endif /* CONFIG_CIFS_DFS_UPCALL */
1608 #ifdef CONFIG_CIFS_UPCALL
1609 rc = init_cifs_spnego();
1611 goto out_destroy_dfs_cache;
1612 #endif /* CONFIG_CIFS_UPCALL */
1614 rc = init_cifs_idmap();
1616 goto out_register_key_type;
1618 rc = register_filesystem(&cifs_fs_type);
1620 goto out_init_cifs_idmap;
1622 rc = register_filesystem(&smb3_fs_type);
1624 unregister_filesystem(&cifs_fs_type);
1625 goto out_init_cifs_idmap;
1630 out_init_cifs_idmap:
1632 out_register_key_type:
1633 #ifdef CONFIG_CIFS_UPCALL
1635 out_destroy_dfs_cache:
1637 #ifdef CONFIG_CIFS_DFS_UPCALL
1638 dfs_cache_destroy();
1639 out_destroy_request_bufs:
1641 cifs_destroy_request_bufs();
1643 cifs_destroy_mids();
1644 out_destroy_inodecache:
1645 cifs_destroy_inodecache();
1647 cifs_fscache_unregister();
1648 out_destroy_cifsoplockd_wq:
1649 destroy_workqueue(cifsoplockd_wq);
1650 out_destroy_fileinfo_put_wq:
1651 destroy_workqueue(fileinfo_put_wq);
1652 out_destroy_decrypt_wq:
1653 destroy_workqueue(decrypt_wq);
1654 out_destroy_cifsiod_wq:
1655 destroy_workqueue(cifsiod_wq);
1664 cifs_dbg(NOISY, "exit_smb3\n");
1665 unregister_filesystem(&cifs_fs_type);
1666 unregister_filesystem(&smb3_fs_type);
1667 cifs_dfs_release_automount_timer();
1669 #ifdef CONFIG_CIFS_UPCALL
1672 #ifdef CONFIG_CIFS_DFS_UPCALL
1673 dfs_cache_destroy();
1675 cifs_destroy_request_bufs();
1676 cifs_destroy_mids();
1677 cifs_destroy_inodecache();
1678 cifs_fscache_unregister();
1679 destroy_workqueue(cifsoplockd_wq);
1680 destroy_workqueue(decrypt_wq);
1681 destroy_workqueue(fileinfo_put_wq);
1682 destroy_workqueue(cifsiod_wq);
1686 MODULE_AUTHOR("Steve French");
1687 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1689 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1690 "also older servers complying with the SNIA CIFS Specification)");
1691 MODULE_VERSION(CIFS_VERSION);
1692 MODULE_SOFTDEP("ecb");
1693 MODULE_SOFTDEP("hmac");
1694 MODULE_SOFTDEP("md4");
1695 MODULE_SOFTDEP("md5");
1696 MODULE_SOFTDEP("nls");
1697 MODULE_SOFTDEP("aes");
1698 MODULE_SOFTDEP("cmac");
1699 MODULE_SOFTDEP("sha256");
1700 MODULE_SOFTDEP("sha512");
1701 MODULE_SOFTDEP("aead2");
1702 MODULE_SOFTDEP("ccm");
1703 MODULE_SOFTDEP("gcm");
1704 module_init(init_cifs)
1705 module_exit(exit_cifs)