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 #ifdef CONFIG_CIFS_SWN_UPCALL
61 #include "fs_context.h"
64 * DOS dates from 1980/1/1 through 2107/12/31
65 * Protocol specifications indicate the range should be to 119, which
66 * limits maximum year to 2099. But this range has not been checked.
68 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
69 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
70 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
74 bool enable_oplocks = true;
75 bool linuxExtEnabled = true;
76 bool lookupCacheEnabled = true;
77 bool disable_legacy_dialects; /* false by default */
78 bool enable_gcm_256; /* false by default, change when more servers support it */
79 bool require_gcm_256; /* false by default */
80 unsigned int global_secflags = CIFSSEC_DEF;
81 /* unsigned int ntlmv2_support = 0; */
82 unsigned int sign_CIFS_PDUs = 1;
83 static const struct super_operations cifs_super_ops;
84 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
85 module_param(CIFSMaxBufSize, uint, 0444);
86 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
88 "Default: 16384 Range: 8192 to 130048");
89 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
90 module_param(cifs_min_rcv, uint, 0444);
91 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
93 unsigned int cifs_min_small = 30;
94 module_param(cifs_min_small, uint, 0444);
95 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
97 unsigned int cifs_max_pending = CIFS_MAX_REQ;
98 module_param(cifs_max_pending, uint, 0444);
99 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
100 "CIFS/SMB1 dialect (N/A for SMB3) "
101 "Default: 32767 Range: 2 to 32767.");
102 #ifdef CONFIG_CIFS_STATS2
103 unsigned int slow_rsp_threshold = 1;
104 module_param(slow_rsp_threshold, uint, 0644);
105 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
106 "before logging that a response is delayed. "
107 "Default: 1 (if set to 0 disables msg).");
110 module_param(enable_oplocks, bool, 0644);
111 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
113 module_param(enable_gcm_256, bool, 0644);
114 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
116 module_param(require_gcm_256, bool, 0644);
117 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
119 module_param(disable_legacy_dialects, bool, 0644);
120 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
121 "helpful to restrict the ability to "
122 "override the default dialects (SMB2.1, "
123 "SMB3 and SMB3.02) on mount with old "
124 "dialects (CIFS/SMB1 and SMB2) since "
125 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
126 " and less secure. Default: n/N/0");
128 extern mempool_t *cifs_sm_req_poolp;
129 extern mempool_t *cifs_req_poolp;
130 extern mempool_t *cifs_mid_poolp;
132 struct workqueue_struct *cifsiod_wq;
133 struct workqueue_struct *decrypt_wq;
134 struct workqueue_struct *fileinfo_put_wq;
135 struct workqueue_struct *cifsoplockd_wq;
136 __u32 cifs_lock_secret;
139 * Bumps refcount for cifs super block.
140 * Note that it should be only called if a referece to VFS super block is
141 * already held, e.g. in open-type syscalls context. Otherwise it can race with
142 * atomic_dec_and_test in deactivate_locked_super.
145 cifs_sb_active(struct super_block *sb)
147 struct cifs_sb_info *server = CIFS_SB(sb);
149 if (atomic_inc_return(&server->active) == 1)
150 atomic_inc(&sb->s_active);
154 cifs_sb_deactive(struct super_block *sb)
156 struct cifs_sb_info *server = CIFS_SB(sb);
158 if (atomic_dec_and_test(&server->active))
159 deactivate_super(sb);
163 cifs_read_super(struct super_block *sb)
166 struct cifs_sb_info *cifs_sb;
167 struct cifs_tcon *tcon;
168 struct timespec64 ts;
171 cifs_sb = CIFS_SB(sb);
172 tcon = cifs_sb_master_tcon(cifs_sb);
174 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
175 sb->s_flags |= SB_POSIXACL;
177 if (tcon->snapshot_time)
178 sb->s_flags |= SB_RDONLY;
180 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
181 sb->s_maxbytes = MAX_LFS_FILESIZE;
183 sb->s_maxbytes = MAX_NON_LFS;
186 * Some very old servers like DOS and OS/2 used 2 second granularity
187 * (while all current servers use 100ns granularity - see MS-DTYP)
188 * but 1 second is the maximum allowed granularity for the VFS
189 * so for old servers set time granularity to 1 second while for
190 * everything else (current servers) set it to 100ns.
192 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
193 ((tcon->ses->capabilities &
194 tcon->ses->server->vals->cap_nt_find) == 0) &&
196 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
197 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
198 sb->s_time_min = ts.tv_sec;
199 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
200 cpu_to_le16(SMB_TIME_MAX), 0);
201 sb->s_time_max = ts.tv_sec;
204 * Almost every server, including all SMB2+, uses DCE TIME
205 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
207 sb->s_time_gran = 100;
208 ts = cifs_NTtimeToUnix(0);
209 sb->s_time_min = ts.tv_sec;
210 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
211 sb->s_time_max = ts.tv_sec;
214 sb->s_magic = CIFS_MAGIC_NUMBER;
215 sb->s_op = &cifs_super_ops;
216 sb->s_xattr = cifs_xattr_handlers;
217 rc = super_setup_bdi(sb);
220 /* tune readahead according to rsize */
221 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
223 sb->s_blocksize = CIFS_MAX_MSGSIZE;
224 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
225 inode = cifs_root_iget(sb);
233 sb->s_d_op = &cifs_ci_dentry_ops;
235 sb->s_d_op = &cifs_dentry_ops;
237 sb->s_root = d_make_root(inode);
243 #ifdef CONFIG_CIFS_NFSD_EXPORT
244 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
245 cifs_dbg(FYI, "export ops supported\n");
246 sb->s_export_op = &cifs_export_ops;
248 #endif /* CONFIG_CIFS_NFSD_EXPORT */
253 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
257 static void cifs_kill_sb(struct super_block *sb)
259 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
261 cifs_umount(cifs_sb);
265 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
267 struct super_block *sb = dentry->d_sb;
268 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
269 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
270 struct TCP_Server_Info *server = tcon->ses->server;
276 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
278 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
280 buf->f_namelen = PATH_MAX;
282 buf->f_fsid.val[0] = tcon->vol_serial_number;
283 /* are using part of create time for more randomness, see man statfs */
284 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
286 buf->f_files = 0; /* undefined */
287 buf->f_ffree = 0; /* unlimited */
289 if (server->ops->queryfs)
290 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
296 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
298 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
299 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
300 struct TCP_Server_Info *server = tcon->ses->server;
302 if (server->ops->fallocate)
303 return server->ops->fallocate(file, tcon, mode, off, len);
308 static int cifs_permission(struct inode *inode, int mask)
310 struct cifs_sb_info *cifs_sb;
312 cifs_sb = CIFS_SB(inode->i_sb);
314 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
315 if ((mask & MAY_EXEC) && !execute_ok(inode))
319 } else /* file mode might have been restricted at mount time
320 on the client (above and beyond ACL on servers) for
321 servers which do not support setting and viewing mode bits,
322 so allowing client to check permissions is useful */
323 return generic_permission(inode, mask);
326 static struct kmem_cache *cifs_inode_cachep;
327 static struct kmem_cache *cifs_req_cachep;
328 static struct kmem_cache *cifs_mid_cachep;
329 static struct kmem_cache *cifs_sm_req_cachep;
330 mempool_t *cifs_sm_req_poolp;
331 mempool_t *cifs_req_poolp;
332 mempool_t *cifs_mid_poolp;
334 static struct inode *
335 cifs_alloc_inode(struct super_block *sb)
337 struct cifsInodeInfo *cifs_inode;
338 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
341 cifs_inode->cifsAttrs = 0x20; /* default */
342 cifs_inode->time = 0;
344 * Until the file is open and we have gotten oplock info back from the
345 * server, can not assume caching of file data or metadata.
347 cifs_set_oplock_level(cifs_inode, 0);
348 cifs_inode->flags = 0;
349 spin_lock_init(&cifs_inode->writers_lock);
350 cifs_inode->writers = 0;
351 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
352 cifs_inode->server_eof = 0;
353 cifs_inode->uniqueid = 0;
354 cifs_inode->createtime = 0;
355 cifs_inode->epoch = 0;
356 spin_lock_init(&cifs_inode->open_file_lock);
357 generate_random_uuid(cifs_inode->lease_key);
360 * Can not set i_flags here - they get immediately overwritten to zero
363 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
364 INIT_LIST_HEAD(&cifs_inode->openFileList);
365 INIT_LIST_HEAD(&cifs_inode->llist);
366 return &cifs_inode->vfs_inode;
370 cifs_free_inode(struct inode *inode)
372 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
376 cifs_evict_inode(struct inode *inode)
378 truncate_inode_pages_final(&inode->i_data);
380 cifs_fscache_release_inode_cookie(inode);
384 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
386 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
387 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
389 seq_puts(s, ",addr=");
391 switch (server->dstaddr.ss_family) {
393 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
396 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
397 if (sa6->sin6_scope_id)
398 seq_printf(s, "%%%u", sa6->sin6_scope_id);
401 seq_puts(s, "(unknown)");
404 seq_puts(s, ",rdma");
408 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
410 if (ses->sectype == Unspecified) {
411 if (ses->user_name == NULL)
412 seq_puts(s, ",sec=none");
416 seq_puts(s, ",sec=");
418 switch (ses->sectype) {
420 seq_puts(s, "lanman");
423 seq_puts(s, "ntlmv2");
432 seq_puts(s, "ntlmssp");
435 /* shouldn't ever happen */
436 seq_puts(s, "unknown");
443 if (ses->sectype == Kerberos)
444 seq_printf(s, ",cruid=%u",
445 from_kuid_munged(&init_user_ns, ses->cred_uid));
449 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
451 seq_puts(s, ",cache=");
453 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
454 seq_puts(s, "strict");
455 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
457 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
458 seq_puts(s, "singleclient"); /* assume only one client access */
459 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
460 seq_puts(s, "ro"); /* read only caching assumed */
462 seq_puts(s, "loose");
466 * cifs_show_options() is for displaying mount options in /proc/mounts.
467 * Not all settable options are displayed but most of the important
471 cifs_show_options(struct seq_file *s, struct dentry *root)
473 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
474 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
475 struct sockaddr *srcaddr;
476 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
478 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
479 cifs_show_security(s, tcon->ses);
480 cifs_show_cache_flavor(s, cifs_sb);
483 seq_puts(s, ",nolease");
484 if (cifs_sb->ctx->multiuser)
485 seq_puts(s, ",multiuser");
486 else if (tcon->ses->user_name)
487 seq_show_option(s, "username", tcon->ses->user_name);
489 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
490 seq_show_option(s, "domain", tcon->ses->domainName);
492 if (srcaddr->sa_family != AF_UNSPEC) {
493 struct sockaddr_in *saddr4;
494 struct sockaddr_in6 *saddr6;
495 saddr4 = (struct sockaddr_in *)srcaddr;
496 saddr6 = (struct sockaddr_in6 *)srcaddr;
497 if (srcaddr->sa_family == AF_INET6)
498 seq_printf(s, ",srcaddr=%pI6c",
500 else if (srcaddr->sa_family == AF_INET)
501 seq_printf(s, ",srcaddr=%pI4",
502 &saddr4->sin_addr.s_addr);
504 seq_printf(s, ",srcaddr=BAD-AF:%i",
505 (int)(srcaddr->sa_family));
508 seq_printf(s, ",uid=%u",
509 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
511 seq_puts(s, ",forceuid");
513 seq_puts(s, ",noforceuid");
515 seq_printf(s, ",gid=%u",
516 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
517 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
518 seq_puts(s, ",forcegid");
520 seq_puts(s, ",noforcegid");
522 cifs_show_address(s, tcon->ses->server);
525 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
526 cifs_sb->ctx->file_mode,
527 cifs_sb->ctx->dir_mode);
528 if (cifs_sb->ctx->iocharset)
529 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
531 seq_puts(s, ",seal");
532 else if (tcon->ses->server->ignore_signature)
533 seq_puts(s, ",signloosely");
535 seq_puts(s, ",nocase");
537 seq_puts(s, ",nodelete");
538 if (tcon->local_lease)
539 seq_puts(s, ",locallease");
541 seq_puts(s, ",hard");
543 seq_puts(s, ",soft");
544 if (tcon->use_persistent)
545 seq_puts(s, ",persistenthandles");
546 else if (tcon->use_resilient)
547 seq_puts(s, ",resilienthandles");
548 if (tcon->posix_extensions)
549 seq_puts(s, ",posix");
550 else if (tcon->unix_ext)
551 seq_puts(s, ",unix");
553 seq_puts(s, ",nounix");
554 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
555 seq_puts(s, ",nodfs");
556 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
557 seq_puts(s, ",posixpaths");
558 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
559 seq_puts(s, ",setuids");
560 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
561 seq_puts(s, ",idsfromsid");
562 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
563 seq_puts(s, ",serverino");
564 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
565 seq_puts(s, ",rwpidforward");
566 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
567 seq_puts(s, ",forcemand");
568 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
569 seq_puts(s, ",nouser_xattr");
570 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
571 seq_puts(s, ",mapchars");
572 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
573 seq_puts(s, ",mapposix");
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
576 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
577 seq_puts(s, ",nobrl");
578 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
579 seq_puts(s, ",nohandlecache");
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
581 seq_puts(s, ",modefromsid");
582 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
583 seq_puts(s, ",cifsacl");
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
585 seq_puts(s, ",dynperm");
586 if (root->d_sb->s_flags & SB_POSIXACL)
588 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
589 seq_puts(s, ",mfsymlinks");
590 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
593 seq_puts(s, ",nostrictsync");
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
595 seq_puts(s, ",noperm");
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
597 seq_printf(s, ",backupuid=%u",
598 from_kuid_munged(&init_user_ns,
599 cifs_sb->ctx->backupuid));
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
601 seq_printf(s, ",backupgid=%u",
602 from_kgid_munged(&init_user_ns,
603 cifs_sb->ctx->backupgid));
605 if (cifs_sb->ctx->got_rsize)
606 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
607 if (cifs_sb->ctx->got_wsize)
608 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
609 if (cifs_sb->ctx->got_bsize)
610 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
611 if (tcon->ses->server->min_offload)
612 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
613 seq_printf(s, ",echo_interval=%lu",
614 tcon->ses->server->echo_interval / HZ);
616 /* Only display max_credits if it was overridden on mount */
617 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
618 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
620 if (tcon->snapshot_time)
621 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
622 if (tcon->handle_timeout)
623 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
624 /* convert actimeo and display it in seconds */
625 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->actimeo / HZ);
627 if (tcon->ses->chan_max > 1)
628 seq_printf(s, ",multichannel,max_channels=%zu",
629 tcon->ses->chan_max);
631 #ifdef CONFIG_CIFS_SWN_UPCALL
632 if (tcon->use_witness)
633 seq_puts(s, ",witness");
639 static void cifs_umount_begin(struct super_block *sb)
641 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
642 struct cifs_tcon *tcon;
647 tcon = cifs_sb_master_tcon(cifs_sb);
649 spin_lock(&cifs_tcp_ses_lock);
650 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
651 /* we have other mounts to same share or we have
652 already tried to force umount this and woken up
653 all waiting network requests, nothing to do */
654 spin_unlock(&cifs_tcp_ses_lock);
656 } else if (tcon->tc_count == 1)
657 tcon->tidStatus = CifsExiting;
658 spin_unlock(&cifs_tcp_ses_lock);
660 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
661 /* cancel_notify_requests(tcon); */
662 if (tcon->ses && tcon->ses->server) {
663 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
664 wake_up_all(&tcon->ses->server->request_q);
665 wake_up_all(&tcon->ses->server->response_q);
666 msleep(1); /* yield */
667 /* we have to kick the requests once more */
668 wake_up_all(&tcon->ses->server->response_q);
675 #ifdef CONFIG_CIFS_STATS2
676 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
683 static int cifs_drop_inode(struct inode *inode)
685 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
687 /* no serverino => unconditional eviction */
688 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
689 generic_drop_inode(inode);
692 static const struct super_operations cifs_super_ops = {
693 .statfs = cifs_statfs,
694 .alloc_inode = cifs_alloc_inode,
695 .free_inode = cifs_free_inode,
696 .drop_inode = cifs_drop_inode,
697 .evict_inode = cifs_evict_inode,
698 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
699 function unless later we add lazy close of inodes or unless the
700 kernel forgets to call us with the same number of releases (closes)
702 .show_options = cifs_show_options,
703 .umount_begin = cifs_umount_begin,
704 #ifdef CONFIG_CIFS_STATS2
705 .show_stats = cifs_show_stats,
710 * Get root dentry from superblock according to prefix path mount option.
711 * Return dentry with refcount + 1 on success and NULL otherwise.
713 static struct dentry *
714 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
716 struct dentry *dentry;
717 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
718 char *full_path = NULL;
722 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
723 return dget(sb->s_root);
725 full_path = cifs_build_path_to_root(ctx, cifs_sb,
726 cifs_sb_master_tcon(cifs_sb), 0);
727 if (full_path == NULL)
728 return ERR_PTR(-ENOMEM);
730 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
732 sep = CIFS_DIR_SEP(cifs_sb);
733 dentry = dget(sb->s_root);
737 struct inode *dir = d_inode(dentry);
738 struct dentry *child;
740 if (!S_ISDIR(dir->i_mode)) {
742 dentry = ERR_PTR(-ENOTDIR);
746 /* skip separators */
753 while (*s && *s != sep)
756 child = lookup_positive_unlocked(p, dentry, s - p);
759 } while (!IS_ERR(dentry));
764 static int cifs_set_super(struct super_block *sb, void *data)
766 struct cifs_mnt_data *mnt_data = data;
767 sb->s_fs_info = mnt_data->cifs_sb;
768 return set_anon_super(sb, NULL);
772 cifs_smb3_do_mount(struct file_system_type *fs_type,
773 int flags, struct smb3_fs_context *old_ctx)
776 struct super_block *sb;
777 struct cifs_sb_info *cifs_sb = NULL;
778 struct cifs_mnt_data mnt_data;
782 * Prints in Kernel / CIFS log the attempted mount operation
783 * If CIFS_DEBUG && cifs_FYI
786 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
788 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
790 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
791 if (cifs_sb == NULL) {
792 root = ERR_PTR(-ENOMEM);
796 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
798 root = ERR_PTR(-ENOMEM);
801 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
807 rc = cifs_setup_volume_info(cifs_sb->ctx);
813 rc = cifs_setup_cifs_sb(cifs_sb);
819 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
821 if (!(flags & SB_SILENT))
822 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
828 mnt_data.ctx = cifs_sb->ctx;
829 mnt_data.cifs_sb = cifs_sb;
830 mnt_data.flags = flags;
832 /* BB should we make this contingent on mount parm? */
833 flags |= SB_NODIRATIME | SB_NOATIME;
835 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
838 cifs_umount(cifs_sb);
843 cifs_dbg(FYI, "Use existing superblock\n");
844 cifs_umount(cifs_sb);
846 rc = cifs_read_super(sb);
852 sb->s_flags |= SB_ACTIVE;
855 root = cifs_get_root(cifs_sb->ctx, sb);
859 cifs_dbg(FYI, "dentry root is: %p\n", root);
863 deactivate_locked_super(sb);
866 kfree(cifs_sb->prepath);
867 smb3_cleanup_fs_context(cifs_sb->ctx);
875 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
878 struct inode *inode = file_inode(iocb->ki_filp);
880 if (iocb->ki_filp->f_flags & O_DIRECT)
881 return cifs_user_readv(iocb, iter);
883 rc = cifs_revalidate_mapping(inode);
887 return generic_file_read_iter(iocb, iter);
890 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
892 struct inode *inode = file_inode(iocb->ki_filp);
893 struct cifsInodeInfo *cinode = CIFS_I(inode);
897 if (iocb->ki_filp->f_flags & O_DIRECT) {
898 written = cifs_user_writev(iocb, from);
899 if (written > 0 && CIFS_CACHE_READ(cinode)) {
900 cifs_zap_mapping(inode);
902 "Set no oplock for inode=%p after a write operation\n",
909 written = cifs_get_writer(cinode);
913 written = generic_file_write_iter(iocb, from);
915 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
918 rc = filemap_fdatawrite(inode->i_mapping);
920 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
924 cifs_put_writer(cinode);
928 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
930 struct cifsFileInfo *cfile = file->private_data;
931 struct cifs_tcon *tcon;
934 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
935 * the cached file length
937 if (whence != SEEK_SET && whence != SEEK_CUR) {
939 struct inode *inode = file_inode(file);
942 * We need to be sure that all dirty pages are written and the
943 * server has the newest file length.
945 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
946 inode->i_mapping->nrpages != 0) {
947 rc = filemap_fdatawait(inode->i_mapping);
949 mapping_set_error(inode->i_mapping, rc);
954 * Some applications poll for the file length in this strange
955 * way so we must seek to end on non-oplocked files by
956 * setting the revalidate time to zero.
958 CIFS_I(inode)->time = 0;
960 rc = cifs_revalidate_file_attr(file);
964 if (cfile && cfile->tlink) {
965 tcon = tlink_tcon(cfile->tlink);
966 if (tcon->ses->server->ops->llseek)
967 return tcon->ses->server->ops->llseek(file, tcon,
970 return generic_file_llseek(file, offset, whence);
974 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
977 * Note that this is called by vfs setlease with i_lock held to
978 * protect *lease from going away.
980 struct inode *inode = file_inode(file);
981 struct cifsFileInfo *cfile = file->private_data;
983 if (!(S_ISREG(inode->i_mode)))
986 /* Check if file is oplocked if this is request for new lease */
987 if (arg == F_UNLCK ||
988 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
989 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
990 return generic_setlease(file, arg, lease, priv);
991 else if (tlink_tcon(cfile->tlink)->local_lease &&
992 !CIFS_CACHE_READ(CIFS_I(inode)))
994 * If the server claims to support oplock on this file, then we
995 * still need to check oplock even if the local_lease mount
996 * option is set, but there are servers which do not support
997 * oplock for which this mount option may be useful if the user
998 * knows that the file won't be changed on the server by anyone
1001 return generic_setlease(file, arg, lease, priv);
1006 struct file_system_type cifs_fs_type = {
1007 .owner = THIS_MODULE,
1009 .init_fs_context = smb3_init_fs_context,
1010 .parameters = smb3_fs_parameters,
1011 .kill_sb = cifs_kill_sb,
1012 .fs_flags = FS_RENAME_DOES_D_MOVE,
1014 MODULE_ALIAS_FS("cifs");
1016 static struct file_system_type smb3_fs_type = {
1017 .owner = THIS_MODULE,
1019 .init_fs_context = smb3_init_fs_context,
1020 .parameters = smb3_fs_parameters,
1021 .kill_sb = cifs_kill_sb,
1022 .fs_flags = FS_RENAME_DOES_D_MOVE,
1024 MODULE_ALIAS_FS("smb3");
1025 MODULE_ALIAS("smb3");
1027 const struct inode_operations cifs_dir_inode_ops = {
1028 .create = cifs_create,
1029 .atomic_open = cifs_atomic_open,
1030 .lookup = cifs_lookup,
1031 .getattr = cifs_getattr,
1032 .unlink = cifs_unlink,
1033 .link = cifs_hardlink,
1034 .mkdir = cifs_mkdir,
1035 .rmdir = cifs_rmdir,
1036 .rename = cifs_rename2,
1037 .permission = cifs_permission,
1038 .setattr = cifs_setattr,
1039 .symlink = cifs_symlink,
1040 .mknod = cifs_mknod,
1041 .listxattr = cifs_listxattr,
1044 const struct inode_operations cifs_file_inode_ops = {
1045 .setattr = cifs_setattr,
1046 .getattr = cifs_getattr,
1047 .permission = cifs_permission,
1048 .listxattr = cifs_listxattr,
1049 .fiemap = cifs_fiemap,
1052 const struct inode_operations cifs_symlink_inode_ops = {
1053 .get_link = cifs_get_link,
1054 .permission = cifs_permission,
1055 .listxattr = cifs_listxattr,
1058 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1059 struct file *dst_file, loff_t destoff, loff_t len,
1060 unsigned int remap_flags)
1062 struct inode *src_inode = file_inode(src_file);
1063 struct inode *target_inode = file_inode(dst_file);
1064 struct cifsFileInfo *smb_file_src = src_file->private_data;
1065 struct cifsFileInfo *smb_file_target;
1066 struct cifs_tcon *target_tcon;
1070 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1073 cifs_dbg(FYI, "clone range\n");
1077 if (!src_file->private_data || !dst_file->private_data) {
1079 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1083 smb_file_target = dst_file->private_data;
1084 target_tcon = tlink_tcon(smb_file_target->tlink);
1087 * Note: cifs case is easier than btrfs since server responsible for
1088 * checks for proper open modes and file type and if it wants
1089 * server could even support copy of range where source = target
1091 lock_two_nondirectories(target_inode, src_inode);
1094 len = src_inode->i_size - off;
1096 cifs_dbg(FYI, "about to flush pages\n");
1097 /* should we flush first and last page first */
1098 truncate_inode_pages_range(&target_inode->i_data, destoff,
1099 PAGE_ALIGN(destoff + len)-1);
1101 if (target_tcon->ses->server->ops->duplicate_extents)
1102 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1103 smb_file_src, smb_file_target, off, len, destoff);
1107 /* force revalidate of size and timestamps of target file now
1108 that target is updated on the server */
1109 CIFS_I(target_inode)->time = 0;
1110 /* although unlocking in the reverse order from locking is not
1111 strictly necessary here it is a little cleaner to be consistent */
1112 unlock_two_nondirectories(src_inode, target_inode);
1115 return rc < 0 ? rc : len;
1118 ssize_t cifs_file_copychunk_range(unsigned int xid,
1119 struct file *src_file, loff_t off,
1120 struct file *dst_file, loff_t destoff,
1121 size_t len, unsigned int flags)
1123 struct inode *src_inode = file_inode(src_file);
1124 struct inode *target_inode = file_inode(dst_file);
1125 struct cifsFileInfo *smb_file_src;
1126 struct cifsFileInfo *smb_file_target;
1127 struct cifs_tcon *src_tcon;
1128 struct cifs_tcon *target_tcon;
1131 cifs_dbg(FYI, "copychunk range\n");
1133 if (!src_file->private_data || !dst_file->private_data) {
1135 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1140 smb_file_target = dst_file->private_data;
1141 smb_file_src = src_file->private_data;
1142 src_tcon = tlink_tcon(smb_file_src->tlink);
1143 target_tcon = tlink_tcon(smb_file_target->tlink);
1145 if (src_tcon->ses != target_tcon->ses) {
1146 cifs_dbg(VFS, "source and target of copy not on same server\n");
1151 if (!target_tcon->ses->server->ops->copychunk_range)
1155 * Note: cifs case is easier than btrfs since server responsible for
1156 * checks for proper open modes and file type and if it wants
1157 * server could even support copy of range where source = target
1159 lock_two_nondirectories(target_inode, src_inode);
1161 cifs_dbg(FYI, "about to flush pages\n");
1162 /* should we flush first and last page first */
1163 truncate_inode_pages(&target_inode->i_data, 0);
1165 rc = file_modified(dst_file);
1167 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1168 smb_file_src, smb_file_target, off, len, destoff);
1170 file_accessed(src_file);
1172 /* force revalidate of size and timestamps of target file now
1173 * that target is updated on the server
1175 CIFS_I(target_inode)->time = 0;
1176 /* although unlocking in the reverse order from locking is not
1177 * strictly necessary here it is a little cleaner to be consistent
1179 unlock_two_nondirectories(src_inode, target_inode);
1186 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1187 * is a dummy operation.
1189 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1191 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1197 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1198 struct file *dst_file, loff_t destoff,
1199 size_t len, unsigned int flags)
1201 unsigned int xid = get_xid();
1203 struct cifsFileInfo *cfile = dst_file->private_data;
1205 if (cfile->swapfile)
1208 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1212 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1213 rc = generic_copy_file_range(src_file, off, dst_file,
1214 destoff, len, flags);
1218 const struct file_operations cifs_file_ops = {
1219 .read_iter = cifs_loose_read_iter,
1220 .write_iter = cifs_file_write_iter,
1222 .release = cifs_close,
1224 .flock = cifs_flock,
1225 .fsync = cifs_fsync,
1226 .flush = cifs_flush,
1227 .mmap = cifs_file_mmap,
1228 .splice_read = generic_file_splice_read,
1229 .splice_write = iter_file_splice_write,
1230 .llseek = cifs_llseek,
1231 .unlocked_ioctl = cifs_ioctl,
1232 .copy_file_range = cifs_copy_file_range,
1233 .remap_file_range = cifs_remap_file_range,
1234 .setlease = cifs_setlease,
1235 .fallocate = cifs_fallocate,
1238 const struct file_operations cifs_file_strict_ops = {
1239 .read_iter = cifs_strict_readv,
1240 .write_iter = cifs_strict_writev,
1242 .release = cifs_close,
1244 .flock = cifs_flock,
1245 .fsync = cifs_strict_fsync,
1246 .flush = cifs_flush,
1247 .mmap = cifs_file_strict_mmap,
1248 .splice_read = generic_file_splice_read,
1249 .splice_write = iter_file_splice_write,
1250 .llseek = cifs_llseek,
1251 .unlocked_ioctl = cifs_ioctl,
1252 .copy_file_range = cifs_copy_file_range,
1253 .remap_file_range = cifs_remap_file_range,
1254 .setlease = cifs_setlease,
1255 .fallocate = cifs_fallocate,
1258 const struct file_operations cifs_file_direct_ops = {
1259 .read_iter = cifs_direct_readv,
1260 .write_iter = cifs_direct_writev,
1262 .release = cifs_close,
1264 .flock = cifs_flock,
1265 .fsync = cifs_fsync,
1266 .flush = cifs_flush,
1267 .mmap = cifs_file_mmap,
1268 .splice_read = generic_file_splice_read,
1269 .splice_write = iter_file_splice_write,
1270 .unlocked_ioctl = cifs_ioctl,
1271 .copy_file_range = cifs_copy_file_range,
1272 .remap_file_range = cifs_remap_file_range,
1273 .llseek = cifs_llseek,
1274 .setlease = cifs_setlease,
1275 .fallocate = cifs_fallocate,
1278 const struct file_operations cifs_file_nobrl_ops = {
1279 .read_iter = cifs_loose_read_iter,
1280 .write_iter = cifs_file_write_iter,
1282 .release = cifs_close,
1283 .fsync = cifs_fsync,
1284 .flush = cifs_flush,
1285 .mmap = cifs_file_mmap,
1286 .splice_read = generic_file_splice_read,
1287 .splice_write = iter_file_splice_write,
1288 .llseek = cifs_llseek,
1289 .unlocked_ioctl = cifs_ioctl,
1290 .copy_file_range = cifs_copy_file_range,
1291 .remap_file_range = cifs_remap_file_range,
1292 .setlease = cifs_setlease,
1293 .fallocate = cifs_fallocate,
1296 const struct file_operations cifs_file_strict_nobrl_ops = {
1297 .read_iter = cifs_strict_readv,
1298 .write_iter = cifs_strict_writev,
1300 .release = cifs_close,
1301 .fsync = cifs_strict_fsync,
1302 .flush = cifs_flush,
1303 .mmap = cifs_file_strict_mmap,
1304 .splice_read = generic_file_splice_read,
1305 .splice_write = iter_file_splice_write,
1306 .llseek = cifs_llseek,
1307 .unlocked_ioctl = cifs_ioctl,
1308 .copy_file_range = cifs_copy_file_range,
1309 .remap_file_range = cifs_remap_file_range,
1310 .setlease = cifs_setlease,
1311 .fallocate = cifs_fallocate,
1314 const struct file_operations cifs_file_direct_nobrl_ops = {
1315 .read_iter = cifs_direct_readv,
1316 .write_iter = cifs_direct_writev,
1318 .release = cifs_close,
1319 .fsync = cifs_fsync,
1320 .flush = cifs_flush,
1321 .mmap = cifs_file_mmap,
1322 .splice_read = generic_file_splice_read,
1323 .splice_write = iter_file_splice_write,
1324 .unlocked_ioctl = cifs_ioctl,
1325 .copy_file_range = cifs_copy_file_range,
1326 .remap_file_range = cifs_remap_file_range,
1327 .llseek = cifs_llseek,
1328 .setlease = cifs_setlease,
1329 .fallocate = cifs_fallocate,
1332 const struct file_operations cifs_dir_ops = {
1333 .iterate_shared = cifs_readdir,
1334 .release = cifs_closedir,
1335 .read = generic_read_dir,
1336 .unlocked_ioctl = cifs_ioctl,
1337 .copy_file_range = cifs_copy_file_range,
1338 .remap_file_range = cifs_remap_file_range,
1339 .llseek = generic_file_llseek,
1340 .fsync = cifs_dir_fsync,
1344 cifs_init_once(void *inode)
1346 struct cifsInodeInfo *cifsi = inode;
1348 inode_init_once(&cifsi->vfs_inode);
1349 init_rwsem(&cifsi->lock_sem);
1353 cifs_init_inodecache(void)
1355 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1356 sizeof(struct cifsInodeInfo),
1357 0, (SLAB_RECLAIM_ACCOUNT|
1358 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1360 if (cifs_inode_cachep == NULL)
1367 cifs_destroy_inodecache(void)
1370 * Make sure all delayed rcu free inodes are flushed before we
1374 kmem_cache_destroy(cifs_inode_cachep);
1378 cifs_init_request_bufs(void)
1381 * SMB2 maximum header size is bigger than CIFS one - no problems to
1382 * allocate some more bytes for CIFS.
1384 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1386 if (CIFSMaxBufSize < 8192) {
1387 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1388 Unicode path name has to fit in any SMB/CIFS path based frames */
1389 CIFSMaxBufSize = 8192;
1390 } else if (CIFSMaxBufSize > 1024*127) {
1391 CIFSMaxBufSize = 1024 * 127;
1393 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1396 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1397 CIFSMaxBufSize, CIFSMaxBufSize);
1399 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1400 CIFSMaxBufSize + max_hdr_size, 0,
1401 SLAB_HWCACHE_ALIGN, 0,
1402 CIFSMaxBufSize + max_hdr_size,
1404 if (cifs_req_cachep == NULL)
1407 if (cifs_min_rcv < 1)
1409 else if (cifs_min_rcv > 64) {
1411 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1414 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1417 if (cifs_req_poolp == NULL) {
1418 kmem_cache_destroy(cifs_req_cachep);
1421 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1422 almost all handle based requests (but not write response, nor is it
1423 sufficient for path based requests). A smaller size would have
1424 been more efficient (compacting multiple slab items on one 4k page)
1425 for the case in which debug was on, but this larger size allows
1426 more SMBs to use small buffer alloc and is still much more
1427 efficient to alloc 1 per page off the slab compared to 17K (5page)
1428 alloc of large cifs buffers even when page debugging is on */
1429 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1430 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1431 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1432 if (cifs_sm_req_cachep == NULL) {
1433 mempool_destroy(cifs_req_poolp);
1434 kmem_cache_destroy(cifs_req_cachep);
1438 if (cifs_min_small < 2)
1440 else if (cifs_min_small > 256) {
1441 cifs_min_small = 256;
1442 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1445 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1446 cifs_sm_req_cachep);
1448 if (cifs_sm_req_poolp == NULL) {
1449 mempool_destroy(cifs_req_poolp);
1450 kmem_cache_destroy(cifs_req_cachep);
1451 kmem_cache_destroy(cifs_sm_req_cachep);
1459 cifs_destroy_request_bufs(void)
1461 mempool_destroy(cifs_req_poolp);
1462 kmem_cache_destroy(cifs_req_cachep);
1463 mempool_destroy(cifs_sm_req_poolp);
1464 kmem_cache_destroy(cifs_sm_req_cachep);
1468 cifs_init_mids(void)
1470 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1471 sizeof(struct mid_q_entry), 0,
1472 SLAB_HWCACHE_ALIGN, NULL);
1473 if (cifs_mid_cachep == NULL)
1476 /* 3 is a reasonable minimum number of simultaneous operations */
1477 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1478 if (cifs_mid_poolp == NULL) {
1479 kmem_cache_destroy(cifs_mid_cachep);
1487 cifs_destroy_mids(void)
1489 mempool_destroy(cifs_mid_poolp);
1490 kmem_cache_destroy(cifs_mid_cachep);
1498 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1499 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1500 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1501 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1502 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1504 * Initialize Global counters
1506 atomic_set(&sesInfoAllocCount, 0);
1507 atomic_set(&tconInfoAllocCount, 0);
1508 atomic_set(&tcpSesAllocCount, 0);
1509 atomic_set(&tcpSesReconnectCount, 0);
1510 atomic_set(&tconInfoReconnectCount, 0);
1512 atomic_set(&bufAllocCount, 0);
1513 atomic_set(&smBufAllocCount, 0);
1514 #ifdef CONFIG_CIFS_STATS2
1515 atomic_set(&totBufAllocCount, 0);
1516 atomic_set(&totSmBufAllocCount, 0);
1517 if (slow_rsp_threshold < 1)
1518 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1519 else if (slow_rsp_threshold > 32767)
1521 "slow response threshold set higher than recommended (0 to 32767)\n");
1522 #endif /* CONFIG_CIFS_STATS2 */
1524 atomic_set(&midCount, 0);
1525 GlobalCurrentXid = 0;
1526 GlobalTotalActiveXid = 0;
1527 GlobalMaxActiveXid = 0;
1528 spin_lock_init(&cifs_tcp_ses_lock);
1529 spin_lock_init(&GlobalMid_Lock);
1531 cifs_lock_secret = get_random_u32();
1533 if (cifs_max_pending < 2) {
1534 cifs_max_pending = 2;
1535 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1536 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1537 cifs_max_pending = CIFS_MAX_REQ;
1538 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1542 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1545 goto out_clean_proc;
1549 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1550 * so that we don't launch too many worker threads but
1551 * Documentation/core-api/workqueue.rst recommends setting it to 0
1554 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1555 decrypt_wq = alloc_workqueue("smb3decryptd",
1556 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1559 goto out_destroy_cifsiod_wq;
1562 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1563 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1564 if (!fileinfo_put_wq) {
1566 goto out_destroy_decrypt_wq;
1569 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1570 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1571 if (!cifsoplockd_wq) {
1573 goto out_destroy_fileinfo_put_wq;
1576 rc = cifs_fscache_register();
1578 goto out_destroy_cifsoplockd_wq;
1580 rc = cifs_init_inodecache();
1582 goto out_unreg_fscache;
1584 rc = cifs_init_mids();
1586 goto out_destroy_inodecache;
1588 rc = cifs_init_request_bufs();
1590 goto out_destroy_mids;
1592 #ifdef CONFIG_CIFS_DFS_UPCALL
1593 rc = dfs_cache_init();
1595 goto out_destroy_request_bufs;
1596 #endif /* CONFIG_CIFS_DFS_UPCALL */
1597 #ifdef CONFIG_CIFS_UPCALL
1598 rc = init_cifs_spnego();
1600 goto out_destroy_dfs_cache;
1601 #endif /* CONFIG_CIFS_UPCALL */
1602 #ifdef CONFIG_CIFS_SWN_UPCALL
1603 rc = cifs_genl_init();
1605 goto out_register_key_type;
1606 #endif /* CONFIG_CIFS_SWN_UPCALL */
1608 rc = init_cifs_idmap();
1610 goto out_cifs_swn_init;
1612 rc = register_filesystem(&cifs_fs_type);
1614 goto out_init_cifs_idmap;
1616 rc = register_filesystem(&smb3_fs_type);
1618 unregister_filesystem(&cifs_fs_type);
1619 goto out_init_cifs_idmap;
1624 out_init_cifs_idmap:
1627 #ifdef CONFIG_CIFS_SWN_UPCALL
1629 out_register_key_type:
1631 #ifdef CONFIG_CIFS_UPCALL
1633 out_destroy_dfs_cache:
1635 #ifdef CONFIG_CIFS_DFS_UPCALL
1636 dfs_cache_destroy();
1637 out_destroy_request_bufs:
1639 cifs_destroy_request_bufs();
1641 cifs_destroy_mids();
1642 out_destroy_inodecache:
1643 cifs_destroy_inodecache();
1645 cifs_fscache_unregister();
1646 out_destroy_cifsoplockd_wq:
1647 destroy_workqueue(cifsoplockd_wq);
1648 out_destroy_fileinfo_put_wq:
1649 destroy_workqueue(fileinfo_put_wq);
1650 out_destroy_decrypt_wq:
1651 destroy_workqueue(decrypt_wq);
1652 out_destroy_cifsiod_wq:
1653 destroy_workqueue(cifsiod_wq);
1662 cifs_dbg(NOISY, "exit_smb3\n");
1663 unregister_filesystem(&cifs_fs_type);
1664 unregister_filesystem(&smb3_fs_type);
1665 cifs_dfs_release_automount_timer();
1667 #ifdef CONFIG_CIFS_SWN_UPCALL
1670 #ifdef CONFIG_CIFS_UPCALL
1673 #ifdef CONFIG_CIFS_DFS_UPCALL
1674 dfs_cache_destroy();
1676 cifs_destroy_request_bufs();
1677 cifs_destroy_mids();
1678 cifs_destroy_inodecache();
1679 cifs_fscache_unregister();
1680 destroy_workqueue(cifsoplockd_wq);
1681 destroy_workqueue(decrypt_wq);
1682 destroy_workqueue(fileinfo_put_wq);
1683 destroy_workqueue(cifsiod_wq);
1687 MODULE_AUTHOR("Steve French");
1688 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1690 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1691 "also older servers complying with the SNIA CIFS Specification)");
1692 MODULE_VERSION(CIFS_VERSION);
1693 MODULE_SOFTDEP("ecb");
1694 MODULE_SOFTDEP("hmac");
1695 MODULE_SOFTDEP("md4");
1696 MODULE_SOFTDEP("md5");
1697 MODULE_SOFTDEP("nls");
1698 MODULE_SOFTDEP("aes");
1699 MODULE_SOFTDEP("cmac");
1700 MODULE_SOFTDEP("sha256");
1701 MODULE_SOFTDEP("sha512");
1702 MODULE_SOFTDEP("aead2");
1703 MODULE_SOFTDEP("ccm");
1704 MODULE_SOFTDEP("gcm");
1705 module_init(init_cifs)
1706 module_exit(exit_cifs)