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 = true;
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 struct workqueue_struct *deferredclose_wq;
137 __u32 cifs_lock_secret;
140 * Bumps refcount for cifs super block.
141 * Note that it should be only called if a referece to VFS super block is
142 * already held, e.g. in open-type syscalls context. Otherwise it can race with
143 * atomic_dec_and_test in deactivate_locked_super.
146 cifs_sb_active(struct super_block *sb)
148 struct cifs_sb_info *server = CIFS_SB(sb);
150 if (atomic_inc_return(&server->active) == 1)
151 atomic_inc(&sb->s_active);
155 cifs_sb_deactive(struct super_block *sb)
157 struct cifs_sb_info *server = CIFS_SB(sb);
159 if (atomic_dec_and_test(&server->active))
160 deactivate_super(sb);
164 cifs_read_super(struct super_block *sb)
167 struct cifs_sb_info *cifs_sb;
168 struct cifs_tcon *tcon;
169 struct timespec64 ts;
172 cifs_sb = CIFS_SB(sb);
173 tcon = cifs_sb_master_tcon(cifs_sb);
175 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
176 sb->s_flags |= SB_POSIXACL;
178 if (tcon->snapshot_time)
179 sb->s_flags |= SB_RDONLY;
181 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
182 sb->s_maxbytes = MAX_LFS_FILESIZE;
184 sb->s_maxbytes = MAX_NON_LFS;
187 * Some very old servers like DOS and OS/2 used 2 second granularity
188 * (while all current servers use 100ns granularity - see MS-DTYP)
189 * but 1 second is the maximum allowed granularity for the VFS
190 * so for old servers set time granularity to 1 second while for
191 * everything else (current servers) set it to 100ns.
193 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
194 ((tcon->ses->capabilities &
195 tcon->ses->server->vals->cap_nt_find) == 0) &&
197 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
198 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
199 sb->s_time_min = ts.tv_sec;
200 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
201 cpu_to_le16(SMB_TIME_MAX), 0);
202 sb->s_time_max = ts.tv_sec;
205 * Almost every server, including all SMB2+, uses DCE TIME
206 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
208 sb->s_time_gran = 100;
209 ts = cifs_NTtimeToUnix(0);
210 sb->s_time_min = ts.tv_sec;
211 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
212 sb->s_time_max = ts.tv_sec;
215 sb->s_magic = CIFS_MAGIC_NUMBER;
216 sb->s_op = &cifs_super_ops;
217 sb->s_xattr = cifs_xattr_handlers;
218 rc = super_setup_bdi(sb);
221 /* tune readahead according to rsize if readahead size not set on mount */
222 if (cifs_sb->ctx->rasize)
223 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
225 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
227 sb->s_blocksize = CIFS_MAX_MSGSIZE;
228 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
229 inode = cifs_root_iget(sb);
237 sb->s_d_op = &cifs_ci_dentry_ops;
239 sb->s_d_op = &cifs_dentry_ops;
241 sb->s_root = d_make_root(inode);
247 #ifdef CONFIG_CIFS_NFSD_EXPORT
248 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
249 cifs_dbg(FYI, "export ops supported\n");
250 sb->s_export_op = &cifs_export_ops;
252 #endif /* CONFIG_CIFS_NFSD_EXPORT */
257 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
261 static void cifs_kill_sb(struct super_block *sb)
263 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
264 struct cifs_tcon *tcon;
265 struct cached_fid *cfid;
268 * We ned to release all dentries for the cached directories
269 * before we kill the sb.
273 cifs_sb->root = NULL;
275 tcon = cifs_sb_master_tcon(cifs_sb);
278 mutex_lock(&cfid->fid_mutex);
284 mutex_unlock(&cfid->fid_mutex);
288 cifs_umount(cifs_sb);
292 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
294 struct super_block *sb = dentry->d_sb;
295 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
296 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
297 struct TCP_Server_Info *server = tcon->ses->server;
303 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
305 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
307 buf->f_namelen = PATH_MAX;
309 buf->f_fsid.val[0] = tcon->vol_serial_number;
310 /* are using part of create time for more randomness, see man statfs */
311 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
313 buf->f_files = 0; /* undefined */
314 buf->f_ffree = 0; /* unlimited */
316 if (server->ops->queryfs)
317 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
323 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
325 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
326 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
327 struct TCP_Server_Info *server = tcon->ses->server;
329 if (server->ops->fallocate)
330 return server->ops->fallocate(file, tcon, mode, off, len);
335 static int cifs_permission(struct user_namespace *mnt_userns,
336 struct inode *inode, int mask)
338 struct cifs_sb_info *cifs_sb;
340 cifs_sb = CIFS_SB(inode->i_sb);
342 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
343 if ((mask & MAY_EXEC) && !execute_ok(inode))
347 } else /* file mode might have been restricted at mount time
348 on the client (above and beyond ACL on servers) for
349 servers which do not support setting and viewing mode bits,
350 so allowing client to check permissions is useful */
351 return generic_permission(&init_user_ns, inode, mask);
354 static struct kmem_cache *cifs_inode_cachep;
355 static struct kmem_cache *cifs_req_cachep;
356 static struct kmem_cache *cifs_mid_cachep;
357 static struct kmem_cache *cifs_sm_req_cachep;
358 mempool_t *cifs_sm_req_poolp;
359 mempool_t *cifs_req_poolp;
360 mempool_t *cifs_mid_poolp;
362 static struct inode *
363 cifs_alloc_inode(struct super_block *sb)
365 struct cifsInodeInfo *cifs_inode;
366 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
369 cifs_inode->cifsAttrs = 0x20; /* default */
370 cifs_inode->time = 0;
372 * Until the file is open and we have gotten oplock info back from the
373 * server, can not assume caching of file data or metadata.
375 cifs_set_oplock_level(cifs_inode, 0);
376 cifs_inode->flags = 0;
377 spin_lock_init(&cifs_inode->writers_lock);
378 cifs_inode->writers = 0;
379 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
380 cifs_inode->server_eof = 0;
381 cifs_inode->uniqueid = 0;
382 cifs_inode->createtime = 0;
383 cifs_inode->epoch = 0;
384 spin_lock_init(&cifs_inode->open_file_lock);
385 generate_random_uuid(cifs_inode->lease_key);
388 * Can not set i_flags here - they get immediately overwritten to zero
391 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
392 INIT_LIST_HEAD(&cifs_inode->openFileList);
393 INIT_LIST_HEAD(&cifs_inode->llist);
394 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
395 spin_lock_init(&cifs_inode->deferred_lock);
396 return &cifs_inode->vfs_inode;
400 cifs_free_inode(struct inode *inode)
402 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
406 cifs_evict_inode(struct inode *inode)
408 truncate_inode_pages_final(&inode->i_data);
410 cifs_fscache_release_inode_cookie(inode);
414 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
416 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
417 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
419 seq_puts(s, ",addr=");
421 switch (server->dstaddr.ss_family) {
423 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
426 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
427 if (sa6->sin6_scope_id)
428 seq_printf(s, "%%%u", sa6->sin6_scope_id);
431 seq_puts(s, "(unknown)");
434 seq_puts(s, ",rdma");
438 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
440 if (ses->sectype == Unspecified) {
441 if (ses->user_name == NULL)
442 seq_puts(s, ",sec=none");
446 seq_puts(s, ",sec=");
448 switch (ses->sectype) {
450 seq_puts(s, "lanman");
453 seq_puts(s, "ntlmv2");
462 seq_puts(s, "ntlmssp");
465 /* shouldn't ever happen */
466 seq_puts(s, "unknown");
473 if (ses->sectype == Kerberos)
474 seq_printf(s, ",cruid=%u",
475 from_kuid_munged(&init_user_ns, ses->cred_uid));
479 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
481 seq_puts(s, ",cache=");
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
484 seq_puts(s, "strict");
485 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
487 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
488 seq_puts(s, "singleclient"); /* assume only one client access */
489 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
490 seq_puts(s, "ro"); /* read only caching assumed */
492 seq_puts(s, "loose");
496 * cifs_show_devname() is used so we show the mount device name with correct
497 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
499 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
501 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
502 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
507 convert_delimiter(devname, '/');
508 /* escape all spaces in share names */
509 seq_escape(m, devname, " \t");
516 * cifs_show_options() is for displaying mount options in /proc/mounts.
517 * Not all settable options are displayed but most of the important
521 cifs_show_options(struct seq_file *s, struct dentry *root)
523 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
524 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
525 struct sockaddr *srcaddr;
526 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
528 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
529 cifs_show_security(s, tcon->ses);
530 cifs_show_cache_flavor(s, cifs_sb);
533 seq_puts(s, ",nolease");
534 if (cifs_sb->ctx->multiuser)
535 seq_puts(s, ",multiuser");
536 else if (tcon->ses->user_name)
537 seq_show_option(s, "username", tcon->ses->user_name);
539 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
540 seq_show_option(s, "domain", tcon->ses->domainName);
542 if (srcaddr->sa_family != AF_UNSPEC) {
543 struct sockaddr_in *saddr4;
544 struct sockaddr_in6 *saddr6;
545 saddr4 = (struct sockaddr_in *)srcaddr;
546 saddr6 = (struct sockaddr_in6 *)srcaddr;
547 if (srcaddr->sa_family == AF_INET6)
548 seq_printf(s, ",srcaddr=%pI6c",
550 else if (srcaddr->sa_family == AF_INET)
551 seq_printf(s, ",srcaddr=%pI4",
552 &saddr4->sin_addr.s_addr);
554 seq_printf(s, ",srcaddr=BAD-AF:%i",
555 (int)(srcaddr->sa_family));
558 seq_printf(s, ",uid=%u",
559 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
560 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
561 seq_puts(s, ",forceuid");
563 seq_puts(s, ",noforceuid");
565 seq_printf(s, ",gid=%u",
566 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
567 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
568 seq_puts(s, ",forcegid");
570 seq_puts(s, ",noforcegid");
572 cifs_show_address(s, tcon->ses->server);
575 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
576 cifs_sb->ctx->file_mode,
577 cifs_sb->ctx->dir_mode);
578 if (cifs_sb->ctx->iocharset)
579 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
581 seq_puts(s, ",seal");
582 else if (tcon->ses->server->ignore_signature)
583 seq_puts(s, ",signloosely");
585 seq_puts(s, ",nocase");
587 seq_puts(s, ",nodelete");
588 if (tcon->local_lease)
589 seq_puts(s, ",locallease");
591 seq_puts(s, ",hard");
593 seq_puts(s, ",soft");
594 if (tcon->use_persistent)
595 seq_puts(s, ",persistenthandles");
596 else if (tcon->use_resilient)
597 seq_puts(s, ",resilienthandles");
598 if (tcon->posix_extensions)
599 seq_puts(s, ",posix");
600 else if (tcon->unix_ext)
601 seq_puts(s, ",unix");
603 seq_puts(s, ",nounix");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
605 seq_puts(s, ",nodfs");
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
607 seq_puts(s, ",posixpaths");
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
609 seq_puts(s, ",setuids");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
611 seq_puts(s, ",idsfromsid");
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
613 seq_puts(s, ",serverino");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
615 seq_puts(s, ",rwpidforward");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
617 seq_puts(s, ",forcemand");
618 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
619 seq_puts(s, ",nouser_xattr");
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
621 seq_puts(s, ",mapchars");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
623 seq_puts(s, ",mapposix");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
627 seq_puts(s, ",nobrl");
628 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
629 seq_puts(s, ",nohandlecache");
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
631 seq_puts(s, ",modefromsid");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
633 seq_puts(s, ",cifsacl");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
635 seq_puts(s, ",dynperm");
636 if (root->d_sb->s_flags & SB_POSIXACL)
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
639 seq_puts(s, ",mfsymlinks");
640 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
643 seq_puts(s, ",nostrictsync");
644 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
645 seq_puts(s, ",noperm");
646 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
647 seq_printf(s, ",backupuid=%u",
648 from_kuid_munged(&init_user_ns,
649 cifs_sb->ctx->backupuid));
650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
651 seq_printf(s, ",backupgid=%u",
652 from_kgid_munged(&init_user_ns,
653 cifs_sb->ctx->backupgid));
655 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
656 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
657 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
658 if (cifs_sb->ctx->rasize)
659 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
660 if (tcon->ses->server->min_offload)
661 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
662 seq_printf(s, ",echo_interval=%lu",
663 tcon->ses->server->echo_interval / HZ);
665 /* Only display max_credits if it was overridden on mount */
666 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
667 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
669 if (tcon->snapshot_time)
670 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
671 if (tcon->handle_timeout)
672 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
675 * Display file and directory attribute timeout in seconds.
676 * If file and directory attribute timeout the same then actimeo
677 * was likely specified on mount
679 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
680 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
682 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
683 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
686 if (tcon->ses->chan_max > 1)
687 seq_printf(s, ",multichannel,max_channels=%zu",
688 tcon->ses->chan_max);
690 if (tcon->use_witness)
691 seq_puts(s, ",witness");
696 static void cifs_umount_begin(struct super_block *sb)
698 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
699 struct cifs_tcon *tcon;
704 tcon = cifs_sb_master_tcon(cifs_sb);
706 spin_lock(&cifs_tcp_ses_lock);
707 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
708 /* we have other mounts to same share or we have
709 already tried to force umount this and woken up
710 all waiting network requests, nothing to do */
711 spin_unlock(&cifs_tcp_ses_lock);
713 } else if (tcon->tc_count == 1)
714 tcon->tidStatus = CifsExiting;
715 spin_unlock(&cifs_tcp_ses_lock);
717 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
718 /* cancel_notify_requests(tcon); */
719 if (tcon->ses && tcon->ses->server) {
720 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
721 wake_up_all(&tcon->ses->server->request_q);
722 wake_up_all(&tcon->ses->server->response_q);
723 msleep(1); /* yield */
724 /* we have to kick the requests once more */
725 wake_up_all(&tcon->ses->server->response_q);
732 #ifdef CONFIG_CIFS_STATS2
733 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
740 static int cifs_drop_inode(struct inode *inode)
742 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
744 /* no serverino => unconditional eviction */
745 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
746 generic_drop_inode(inode);
749 static const struct super_operations cifs_super_ops = {
750 .statfs = cifs_statfs,
751 .alloc_inode = cifs_alloc_inode,
752 .free_inode = cifs_free_inode,
753 .drop_inode = cifs_drop_inode,
754 .evict_inode = cifs_evict_inode,
755 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
756 .show_devname = cifs_show_devname,
757 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
758 function unless later we add lazy close of inodes or unless the
759 kernel forgets to call us with the same number of releases (closes)
761 .show_options = cifs_show_options,
762 .umount_begin = cifs_umount_begin,
763 #ifdef CONFIG_CIFS_STATS2
764 .show_stats = cifs_show_stats,
769 * Get root dentry from superblock according to prefix path mount option.
770 * Return dentry with refcount + 1 on success and NULL otherwise.
772 static struct dentry *
773 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
775 struct dentry *dentry;
776 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
777 char *full_path = NULL;
781 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
782 return dget(sb->s_root);
784 full_path = cifs_build_path_to_root(ctx, cifs_sb,
785 cifs_sb_master_tcon(cifs_sb), 0);
786 if (full_path == NULL)
787 return ERR_PTR(-ENOMEM);
789 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
791 sep = CIFS_DIR_SEP(cifs_sb);
792 dentry = dget(sb->s_root);
796 struct inode *dir = d_inode(dentry);
797 struct dentry *child;
799 if (!S_ISDIR(dir->i_mode)) {
801 dentry = ERR_PTR(-ENOTDIR);
805 /* skip separators */
812 while (*s && *s != sep)
815 child = lookup_positive_unlocked(p, dentry, s - p);
818 } while (!IS_ERR(dentry));
823 static int cifs_set_super(struct super_block *sb, void *data)
825 struct cifs_mnt_data *mnt_data = data;
826 sb->s_fs_info = mnt_data->cifs_sb;
827 return set_anon_super(sb, NULL);
831 cifs_smb3_do_mount(struct file_system_type *fs_type,
832 int flags, struct smb3_fs_context *old_ctx)
835 struct super_block *sb;
836 struct cifs_sb_info *cifs_sb = NULL;
837 struct cifs_mnt_data mnt_data;
841 * Prints in Kernel / CIFS log the attempted mount operation
842 * If CIFS_DEBUG && cifs_FYI
845 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
847 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
849 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
850 if (cifs_sb == NULL) {
851 root = ERR_PTR(-ENOMEM);
855 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
857 root = ERR_PTR(-ENOMEM);
860 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
866 /* cifs_setup_volume_info->smb3_parse_devname() redups UNC & prepath */
867 kfree(cifs_sb->ctx->UNC);
868 cifs_sb->ctx->UNC = NULL;
869 kfree(cifs_sb->ctx->prepath);
870 cifs_sb->ctx->prepath = NULL;
872 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC);
878 rc = cifs_setup_cifs_sb(cifs_sb);
884 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
886 if (!(flags & SB_SILENT))
887 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
893 mnt_data.ctx = cifs_sb->ctx;
894 mnt_data.cifs_sb = cifs_sb;
895 mnt_data.flags = flags;
897 /* BB should we make this contingent on mount parm? */
898 flags |= SB_NODIRATIME | SB_NOATIME;
900 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
903 cifs_umount(cifs_sb);
909 cifs_dbg(FYI, "Use existing superblock\n");
910 cifs_umount(cifs_sb);
913 rc = cifs_read_super(sb);
919 sb->s_flags |= SB_ACTIVE;
922 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
927 cifs_sb->root = dget(root);
929 cifs_dbg(FYI, "dentry root is: %p\n", root);
933 deactivate_locked_super(sb);
936 kfree(cifs_sb->prepath);
937 smb3_cleanup_fs_context(cifs_sb->ctx);
945 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
948 struct inode *inode = file_inode(iocb->ki_filp);
950 if (iocb->ki_filp->f_flags & O_DIRECT)
951 return cifs_user_readv(iocb, iter);
953 rc = cifs_revalidate_mapping(inode);
957 return generic_file_read_iter(iocb, iter);
960 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
962 struct inode *inode = file_inode(iocb->ki_filp);
963 struct cifsInodeInfo *cinode = CIFS_I(inode);
967 if (iocb->ki_filp->f_flags & O_DIRECT) {
968 written = cifs_user_writev(iocb, from);
969 if (written > 0 && CIFS_CACHE_READ(cinode)) {
970 cifs_zap_mapping(inode);
972 "Set no oplock for inode=%p after a write operation\n",
979 written = cifs_get_writer(cinode);
983 written = generic_file_write_iter(iocb, from);
985 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
988 rc = filemap_fdatawrite(inode->i_mapping);
990 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
994 cifs_put_writer(cinode);
998 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1000 struct cifsFileInfo *cfile = file->private_data;
1001 struct cifs_tcon *tcon;
1004 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1005 * the cached file length
1007 if (whence != SEEK_SET && whence != SEEK_CUR) {
1009 struct inode *inode = file_inode(file);
1012 * We need to be sure that all dirty pages are written and the
1013 * server has the newest file length.
1015 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1016 inode->i_mapping->nrpages != 0) {
1017 rc = filemap_fdatawait(inode->i_mapping);
1019 mapping_set_error(inode->i_mapping, rc);
1024 * Some applications poll for the file length in this strange
1025 * way so we must seek to end on non-oplocked files by
1026 * setting the revalidate time to zero.
1028 CIFS_I(inode)->time = 0;
1030 rc = cifs_revalidate_file_attr(file);
1034 if (cfile && cfile->tlink) {
1035 tcon = tlink_tcon(cfile->tlink);
1036 if (tcon->ses->server->ops->llseek)
1037 return tcon->ses->server->ops->llseek(file, tcon,
1040 return generic_file_llseek(file, offset, whence);
1044 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1047 * Note that this is called by vfs setlease with i_lock held to
1048 * protect *lease from going away.
1050 struct inode *inode = file_inode(file);
1051 struct cifsFileInfo *cfile = file->private_data;
1053 if (!(S_ISREG(inode->i_mode)))
1056 /* Check if file is oplocked if this is request for new lease */
1057 if (arg == F_UNLCK ||
1058 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1059 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1060 return generic_setlease(file, arg, lease, priv);
1061 else if (tlink_tcon(cfile->tlink)->local_lease &&
1062 !CIFS_CACHE_READ(CIFS_I(inode)))
1064 * If the server claims to support oplock on this file, then we
1065 * still need to check oplock even if the local_lease mount
1066 * option is set, but there are servers which do not support
1067 * oplock for which this mount option may be useful if the user
1068 * knows that the file won't be changed on the server by anyone
1071 return generic_setlease(file, arg, lease, priv);
1076 struct file_system_type cifs_fs_type = {
1077 .owner = THIS_MODULE,
1079 .init_fs_context = smb3_init_fs_context,
1080 .parameters = smb3_fs_parameters,
1081 .kill_sb = cifs_kill_sb,
1082 .fs_flags = FS_RENAME_DOES_D_MOVE,
1084 MODULE_ALIAS_FS("cifs");
1086 static struct file_system_type smb3_fs_type = {
1087 .owner = THIS_MODULE,
1089 .init_fs_context = smb3_init_fs_context,
1090 .parameters = smb3_fs_parameters,
1091 .kill_sb = cifs_kill_sb,
1092 .fs_flags = FS_RENAME_DOES_D_MOVE,
1094 MODULE_ALIAS_FS("smb3");
1095 MODULE_ALIAS("smb3");
1097 const struct inode_operations cifs_dir_inode_ops = {
1098 .create = cifs_create,
1099 .atomic_open = cifs_atomic_open,
1100 .lookup = cifs_lookup,
1101 .getattr = cifs_getattr,
1102 .unlink = cifs_unlink,
1103 .link = cifs_hardlink,
1104 .mkdir = cifs_mkdir,
1105 .rmdir = cifs_rmdir,
1106 .rename = cifs_rename2,
1107 .permission = cifs_permission,
1108 .setattr = cifs_setattr,
1109 .symlink = cifs_symlink,
1110 .mknod = cifs_mknod,
1111 .listxattr = cifs_listxattr,
1114 const struct inode_operations cifs_file_inode_ops = {
1115 .setattr = cifs_setattr,
1116 .getattr = cifs_getattr,
1117 .permission = cifs_permission,
1118 .listxattr = cifs_listxattr,
1119 .fiemap = cifs_fiemap,
1122 const struct inode_operations cifs_symlink_inode_ops = {
1123 .get_link = cifs_get_link,
1124 .permission = cifs_permission,
1125 .listxattr = cifs_listxattr,
1128 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1129 struct file *dst_file, loff_t destoff, loff_t len,
1130 unsigned int remap_flags)
1132 struct inode *src_inode = file_inode(src_file);
1133 struct inode *target_inode = file_inode(dst_file);
1134 struct cifsFileInfo *smb_file_src = src_file->private_data;
1135 struct cifsFileInfo *smb_file_target;
1136 struct cifs_tcon *target_tcon;
1140 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1143 cifs_dbg(FYI, "clone range\n");
1147 if (!src_file->private_data || !dst_file->private_data) {
1149 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1153 smb_file_target = dst_file->private_data;
1154 target_tcon = tlink_tcon(smb_file_target->tlink);
1157 * Note: cifs case is easier than btrfs since server responsible for
1158 * checks for proper open modes and file type and if it wants
1159 * server could even support copy of range where source = target
1161 lock_two_nondirectories(target_inode, src_inode);
1164 len = src_inode->i_size - off;
1166 cifs_dbg(FYI, "about to flush pages\n");
1167 /* should we flush first and last page first */
1168 truncate_inode_pages_range(&target_inode->i_data, destoff,
1169 PAGE_ALIGN(destoff + len)-1);
1171 if (target_tcon->ses->server->ops->duplicate_extents)
1172 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1173 smb_file_src, smb_file_target, off, len, destoff);
1177 /* force revalidate of size and timestamps of target file now
1178 that target is updated on the server */
1179 CIFS_I(target_inode)->time = 0;
1180 /* although unlocking in the reverse order from locking is not
1181 strictly necessary here it is a little cleaner to be consistent */
1182 unlock_two_nondirectories(src_inode, target_inode);
1185 return rc < 0 ? rc : len;
1188 ssize_t cifs_file_copychunk_range(unsigned int xid,
1189 struct file *src_file, loff_t off,
1190 struct file *dst_file, loff_t destoff,
1191 size_t len, unsigned int flags)
1193 struct inode *src_inode = file_inode(src_file);
1194 struct inode *target_inode = file_inode(dst_file);
1195 struct cifsFileInfo *smb_file_src;
1196 struct cifsFileInfo *smb_file_target;
1197 struct cifs_tcon *src_tcon;
1198 struct cifs_tcon *target_tcon;
1201 cifs_dbg(FYI, "copychunk range\n");
1203 if (!src_file->private_data || !dst_file->private_data) {
1205 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1210 smb_file_target = dst_file->private_data;
1211 smb_file_src = src_file->private_data;
1212 src_tcon = tlink_tcon(smb_file_src->tlink);
1213 target_tcon = tlink_tcon(smb_file_target->tlink);
1215 if (src_tcon->ses != target_tcon->ses) {
1216 cifs_dbg(VFS, "source and target of copy not on same server\n");
1221 if (!target_tcon->ses->server->ops->copychunk_range)
1225 * Note: cifs case is easier than btrfs since server responsible for
1226 * checks for proper open modes and file type and if it wants
1227 * server could even support copy of range where source = target
1229 lock_two_nondirectories(target_inode, src_inode);
1231 cifs_dbg(FYI, "about to flush pages\n");
1232 /* should we flush first and last page first */
1233 truncate_inode_pages(&target_inode->i_data, 0);
1235 rc = file_modified(dst_file);
1237 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1238 smb_file_src, smb_file_target, off, len, destoff);
1240 file_accessed(src_file);
1242 /* force revalidate of size and timestamps of target file now
1243 * that target is updated on the server
1245 CIFS_I(target_inode)->time = 0;
1246 /* although unlocking in the reverse order from locking is not
1247 * strictly necessary here it is a little cleaner to be consistent
1249 unlock_two_nondirectories(src_inode, target_inode);
1256 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1257 * is a dummy operation.
1259 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1261 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1267 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1268 struct file *dst_file, loff_t destoff,
1269 size_t len, unsigned int flags)
1271 unsigned int xid = get_xid();
1273 struct cifsFileInfo *cfile = dst_file->private_data;
1275 if (cfile->swapfile)
1278 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1282 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1283 rc = generic_copy_file_range(src_file, off, dst_file,
1284 destoff, len, flags);
1288 const struct file_operations cifs_file_ops = {
1289 .read_iter = cifs_loose_read_iter,
1290 .write_iter = cifs_file_write_iter,
1292 .release = cifs_close,
1294 .flock = cifs_flock,
1295 .fsync = cifs_fsync,
1296 .flush = cifs_flush,
1297 .mmap = cifs_file_mmap,
1298 .splice_read = generic_file_splice_read,
1299 .splice_write = iter_file_splice_write,
1300 .llseek = cifs_llseek,
1301 .unlocked_ioctl = cifs_ioctl,
1302 .copy_file_range = cifs_copy_file_range,
1303 .remap_file_range = cifs_remap_file_range,
1304 .setlease = cifs_setlease,
1305 .fallocate = cifs_fallocate,
1308 const struct file_operations cifs_file_strict_ops = {
1309 .read_iter = cifs_strict_readv,
1310 .write_iter = cifs_strict_writev,
1312 .release = cifs_close,
1314 .flock = cifs_flock,
1315 .fsync = cifs_strict_fsync,
1316 .flush = cifs_flush,
1317 .mmap = cifs_file_strict_mmap,
1318 .splice_read = generic_file_splice_read,
1319 .splice_write = iter_file_splice_write,
1320 .llseek = cifs_llseek,
1321 .unlocked_ioctl = cifs_ioctl,
1322 .copy_file_range = cifs_copy_file_range,
1323 .remap_file_range = cifs_remap_file_range,
1324 .setlease = cifs_setlease,
1325 .fallocate = cifs_fallocate,
1328 const struct file_operations cifs_file_direct_ops = {
1329 .read_iter = cifs_direct_readv,
1330 .write_iter = cifs_direct_writev,
1332 .release = cifs_close,
1334 .flock = cifs_flock,
1335 .fsync = cifs_fsync,
1336 .flush = cifs_flush,
1337 .mmap = cifs_file_mmap,
1338 .splice_read = generic_file_splice_read,
1339 .splice_write = iter_file_splice_write,
1340 .unlocked_ioctl = cifs_ioctl,
1341 .copy_file_range = cifs_copy_file_range,
1342 .remap_file_range = cifs_remap_file_range,
1343 .llseek = cifs_llseek,
1344 .setlease = cifs_setlease,
1345 .fallocate = cifs_fallocate,
1348 const struct file_operations cifs_file_nobrl_ops = {
1349 .read_iter = cifs_loose_read_iter,
1350 .write_iter = cifs_file_write_iter,
1352 .release = cifs_close,
1353 .fsync = cifs_fsync,
1354 .flush = cifs_flush,
1355 .mmap = cifs_file_mmap,
1356 .splice_read = generic_file_splice_read,
1357 .splice_write = iter_file_splice_write,
1358 .llseek = cifs_llseek,
1359 .unlocked_ioctl = cifs_ioctl,
1360 .copy_file_range = cifs_copy_file_range,
1361 .remap_file_range = cifs_remap_file_range,
1362 .setlease = cifs_setlease,
1363 .fallocate = cifs_fallocate,
1366 const struct file_operations cifs_file_strict_nobrl_ops = {
1367 .read_iter = cifs_strict_readv,
1368 .write_iter = cifs_strict_writev,
1370 .release = cifs_close,
1371 .fsync = cifs_strict_fsync,
1372 .flush = cifs_flush,
1373 .mmap = cifs_file_strict_mmap,
1374 .splice_read = generic_file_splice_read,
1375 .splice_write = iter_file_splice_write,
1376 .llseek = cifs_llseek,
1377 .unlocked_ioctl = cifs_ioctl,
1378 .copy_file_range = cifs_copy_file_range,
1379 .remap_file_range = cifs_remap_file_range,
1380 .setlease = cifs_setlease,
1381 .fallocate = cifs_fallocate,
1384 const struct file_operations cifs_file_direct_nobrl_ops = {
1385 .read_iter = cifs_direct_readv,
1386 .write_iter = cifs_direct_writev,
1388 .release = cifs_close,
1389 .fsync = cifs_fsync,
1390 .flush = cifs_flush,
1391 .mmap = cifs_file_mmap,
1392 .splice_read = generic_file_splice_read,
1393 .splice_write = iter_file_splice_write,
1394 .unlocked_ioctl = cifs_ioctl,
1395 .copy_file_range = cifs_copy_file_range,
1396 .remap_file_range = cifs_remap_file_range,
1397 .llseek = cifs_llseek,
1398 .setlease = cifs_setlease,
1399 .fallocate = cifs_fallocate,
1402 const struct file_operations cifs_dir_ops = {
1403 .iterate_shared = cifs_readdir,
1404 .release = cifs_closedir,
1405 .read = generic_read_dir,
1406 .unlocked_ioctl = cifs_ioctl,
1407 .copy_file_range = cifs_copy_file_range,
1408 .remap_file_range = cifs_remap_file_range,
1409 .llseek = generic_file_llseek,
1410 .fsync = cifs_dir_fsync,
1414 cifs_init_once(void *inode)
1416 struct cifsInodeInfo *cifsi = inode;
1418 inode_init_once(&cifsi->vfs_inode);
1419 init_rwsem(&cifsi->lock_sem);
1423 cifs_init_inodecache(void)
1425 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1426 sizeof(struct cifsInodeInfo),
1427 0, (SLAB_RECLAIM_ACCOUNT|
1428 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1430 if (cifs_inode_cachep == NULL)
1437 cifs_destroy_inodecache(void)
1440 * Make sure all delayed rcu free inodes are flushed before we
1444 kmem_cache_destroy(cifs_inode_cachep);
1448 cifs_init_request_bufs(void)
1451 * SMB2 maximum header size is bigger than CIFS one - no problems to
1452 * allocate some more bytes for CIFS.
1454 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1456 if (CIFSMaxBufSize < 8192) {
1457 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1458 Unicode path name has to fit in any SMB/CIFS path based frames */
1459 CIFSMaxBufSize = 8192;
1460 } else if (CIFSMaxBufSize > 1024*127) {
1461 CIFSMaxBufSize = 1024 * 127;
1463 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1466 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1467 CIFSMaxBufSize, CIFSMaxBufSize);
1469 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1470 CIFSMaxBufSize + max_hdr_size, 0,
1471 SLAB_HWCACHE_ALIGN, 0,
1472 CIFSMaxBufSize + max_hdr_size,
1474 if (cifs_req_cachep == NULL)
1477 if (cifs_min_rcv < 1)
1479 else if (cifs_min_rcv > 64) {
1481 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1484 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1487 if (cifs_req_poolp == NULL) {
1488 kmem_cache_destroy(cifs_req_cachep);
1491 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1492 almost all handle based requests (but not write response, nor is it
1493 sufficient for path based requests). A smaller size would have
1494 been more efficient (compacting multiple slab items on one 4k page)
1495 for the case in which debug was on, but this larger size allows
1496 more SMBs to use small buffer alloc and is still much more
1497 efficient to alloc 1 per page off the slab compared to 17K (5page)
1498 alloc of large cifs buffers even when page debugging is on */
1499 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1500 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1501 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1502 if (cifs_sm_req_cachep == NULL) {
1503 mempool_destroy(cifs_req_poolp);
1504 kmem_cache_destroy(cifs_req_cachep);
1508 if (cifs_min_small < 2)
1510 else if (cifs_min_small > 256) {
1511 cifs_min_small = 256;
1512 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1515 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1516 cifs_sm_req_cachep);
1518 if (cifs_sm_req_poolp == NULL) {
1519 mempool_destroy(cifs_req_poolp);
1520 kmem_cache_destroy(cifs_req_cachep);
1521 kmem_cache_destroy(cifs_sm_req_cachep);
1529 cifs_destroy_request_bufs(void)
1531 mempool_destroy(cifs_req_poolp);
1532 kmem_cache_destroy(cifs_req_cachep);
1533 mempool_destroy(cifs_sm_req_poolp);
1534 kmem_cache_destroy(cifs_sm_req_cachep);
1538 cifs_init_mids(void)
1540 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1541 sizeof(struct mid_q_entry), 0,
1542 SLAB_HWCACHE_ALIGN, NULL);
1543 if (cifs_mid_cachep == NULL)
1546 /* 3 is a reasonable minimum number of simultaneous operations */
1547 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1548 if (cifs_mid_poolp == NULL) {
1549 kmem_cache_destroy(cifs_mid_cachep);
1557 cifs_destroy_mids(void)
1559 mempool_destroy(cifs_mid_poolp);
1560 kmem_cache_destroy(cifs_mid_cachep);
1568 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1570 * Initialize Global counters
1572 atomic_set(&sesInfoAllocCount, 0);
1573 atomic_set(&tconInfoAllocCount, 0);
1574 atomic_set(&tcpSesNextId, 0);
1575 atomic_set(&tcpSesAllocCount, 0);
1576 atomic_set(&tcpSesReconnectCount, 0);
1577 atomic_set(&tconInfoReconnectCount, 0);
1579 atomic_set(&bufAllocCount, 0);
1580 atomic_set(&smBufAllocCount, 0);
1581 #ifdef CONFIG_CIFS_STATS2
1582 atomic_set(&totBufAllocCount, 0);
1583 atomic_set(&totSmBufAllocCount, 0);
1584 if (slow_rsp_threshold < 1)
1585 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1586 else if (slow_rsp_threshold > 32767)
1588 "slow response threshold set higher than recommended (0 to 32767)\n");
1589 #endif /* CONFIG_CIFS_STATS2 */
1591 atomic_set(&midCount, 0);
1592 GlobalCurrentXid = 0;
1593 GlobalTotalActiveXid = 0;
1594 GlobalMaxActiveXid = 0;
1595 spin_lock_init(&cifs_tcp_ses_lock);
1596 spin_lock_init(&GlobalMid_Lock);
1598 cifs_lock_secret = get_random_u32();
1600 if (cifs_max_pending < 2) {
1601 cifs_max_pending = 2;
1602 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1603 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1604 cifs_max_pending = CIFS_MAX_REQ;
1605 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1609 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1612 goto out_clean_proc;
1616 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1617 * so that we don't launch too many worker threads but
1618 * Documentation/core-api/workqueue.rst recommends setting it to 0
1621 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1622 decrypt_wq = alloc_workqueue("smb3decryptd",
1623 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1626 goto out_destroy_cifsiod_wq;
1629 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1630 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1631 if (!fileinfo_put_wq) {
1633 goto out_destroy_decrypt_wq;
1636 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1637 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1638 if (!cifsoplockd_wq) {
1640 goto out_destroy_fileinfo_put_wq;
1643 deferredclose_wq = alloc_workqueue("deferredclose",
1644 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1645 if (!deferredclose_wq) {
1647 goto out_destroy_cifsoplockd_wq;
1650 rc = cifs_fscache_register();
1652 goto out_destroy_deferredclose_wq;
1654 rc = cifs_init_inodecache();
1656 goto out_unreg_fscache;
1658 rc = cifs_init_mids();
1660 goto out_destroy_inodecache;
1662 rc = cifs_init_request_bufs();
1664 goto out_destroy_mids;
1666 #ifdef CONFIG_CIFS_DFS_UPCALL
1667 rc = dfs_cache_init();
1669 goto out_destroy_request_bufs;
1670 #endif /* CONFIG_CIFS_DFS_UPCALL */
1671 #ifdef CONFIG_CIFS_UPCALL
1672 rc = init_cifs_spnego();
1674 goto out_destroy_dfs_cache;
1675 #endif /* CONFIG_CIFS_UPCALL */
1676 #ifdef CONFIG_CIFS_SWN_UPCALL
1677 rc = cifs_genl_init();
1679 goto out_register_key_type;
1680 #endif /* CONFIG_CIFS_SWN_UPCALL */
1682 rc = init_cifs_idmap();
1684 goto out_cifs_swn_init;
1686 rc = register_filesystem(&cifs_fs_type);
1688 goto out_init_cifs_idmap;
1690 rc = register_filesystem(&smb3_fs_type);
1692 unregister_filesystem(&cifs_fs_type);
1693 goto out_init_cifs_idmap;
1698 out_init_cifs_idmap:
1701 #ifdef CONFIG_CIFS_SWN_UPCALL
1703 out_register_key_type:
1705 #ifdef CONFIG_CIFS_UPCALL
1707 out_destroy_dfs_cache:
1709 #ifdef CONFIG_CIFS_DFS_UPCALL
1710 dfs_cache_destroy();
1711 out_destroy_request_bufs:
1713 cifs_destroy_request_bufs();
1715 cifs_destroy_mids();
1716 out_destroy_inodecache:
1717 cifs_destroy_inodecache();
1719 cifs_fscache_unregister();
1720 out_destroy_deferredclose_wq:
1721 destroy_workqueue(deferredclose_wq);
1722 out_destroy_cifsoplockd_wq:
1723 destroy_workqueue(cifsoplockd_wq);
1724 out_destroy_fileinfo_put_wq:
1725 destroy_workqueue(fileinfo_put_wq);
1726 out_destroy_decrypt_wq:
1727 destroy_workqueue(decrypt_wq);
1728 out_destroy_cifsiod_wq:
1729 destroy_workqueue(cifsiod_wq);
1738 cifs_dbg(NOISY, "exit_smb3\n");
1739 unregister_filesystem(&cifs_fs_type);
1740 unregister_filesystem(&smb3_fs_type);
1741 cifs_dfs_release_automount_timer();
1743 #ifdef CONFIG_CIFS_SWN_UPCALL
1746 #ifdef CONFIG_CIFS_UPCALL
1749 #ifdef CONFIG_CIFS_DFS_UPCALL
1750 dfs_cache_destroy();
1752 cifs_destroy_request_bufs();
1753 cifs_destroy_mids();
1754 cifs_destroy_inodecache();
1755 cifs_fscache_unregister();
1756 destroy_workqueue(deferredclose_wq);
1757 destroy_workqueue(cifsoplockd_wq);
1758 destroy_workqueue(decrypt_wq);
1759 destroy_workqueue(fileinfo_put_wq);
1760 destroy_workqueue(cifsiod_wq);
1764 MODULE_AUTHOR("Steve French");
1765 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1767 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1768 "also older servers complying with the SNIA CIFS Specification)");
1769 MODULE_VERSION(CIFS_VERSION);
1770 MODULE_SOFTDEP("ecb");
1771 MODULE_SOFTDEP("hmac");
1772 MODULE_SOFTDEP("md4");
1773 MODULE_SOFTDEP("md5");
1774 MODULE_SOFTDEP("nls");
1775 MODULE_SOFTDEP("aes");
1776 MODULE_SOFTDEP("cmac");
1777 MODULE_SOFTDEP("sha256");
1778 MODULE_SOFTDEP("sha512");
1779 MODULE_SOFTDEP("aead2");
1780 MODULE_SOFTDEP("ccm");
1781 MODULE_SOFTDEP("gcm");
1782 module_init(init_cifs)
1783 module_exit(exit_cifs)