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 user_namespace *mnt_userns,
309 struct inode *inode, int mask)
311 struct cifs_sb_info *cifs_sb;
313 cifs_sb = CIFS_SB(inode->i_sb);
315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
316 if ((mask & MAY_EXEC) && !execute_ok(inode))
320 } else /* file mode might have been restricted at mount time
321 on the client (above and beyond ACL on servers) for
322 servers which do not support setting and viewing mode bits,
323 so allowing client to check permissions is useful */
324 return generic_permission(&init_user_ns, inode, mask);
327 static struct kmem_cache *cifs_inode_cachep;
328 static struct kmem_cache *cifs_req_cachep;
329 static struct kmem_cache *cifs_mid_cachep;
330 static struct kmem_cache *cifs_sm_req_cachep;
331 mempool_t *cifs_sm_req_poolp;
332 mempool_t *cifs_req_poolp;
333 mempool_t *cifs_mid_poolp;
335 static struct inode *
336 cifs_alloc_inode(struct super_block *sb)
338 struct cifsInodeInfo *cifs_inode;
339 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
342 cifs_inode->cifsAttrs = 0x20; /* default */
343 cifs_inode->time = 0;
345 * Until the file is open and we have gotten oplock info back from the
346 * server, can not assume caching of file data or metadata.
348 cifs_set_oplock_level(cifs_inode, 0);
349 cifs_inode->flags = 0;
350 spin_lock_init(&cifs_inode->writers_lock);
351 cifs_inode->writers = 0;
352 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
353 cifs_inode->server_eof = 0;
354 cifs_inode->uniqueid = 0;
355 cifs_inode->createtime = 0;
356 cifs_inode->epoch = 0;
357 spin_lock_init(&cifs_inode->open_file_lock);
358 generate_random_uuid(cifs_inode->lease_key);
361 * Can not set i_flags here - they get immediately overwritten to zero
364 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
365 INIT_LIST_HEAD(&cifs_inode->openFileList);
366 INIT_LIST_HEAD(&cifs_inode->llist);
367 return &cifs_inode->vfs_inode;
371 cifs_free_inode(struct inode *inode)
373 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
377 cifs_evict_inode(struct inode *inode)
379 truncate_inode_pages_final(&inode->i_data);
381 cifs_fscache_release_inode_cookie(inode);
385 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
387 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
388 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
390 seq_puts(s, ",addr=");
392 switch (server->dstaddr.ss_family) {
394 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
397 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
398 if (sa6->sin6_scope_id)
399 seq_printf(s, "%%%u", sa6->sin6_scope_id);
402 seq_puts(s, "(unknown)");
405 seq_puts(s, ",rdma");
409 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
411 if (ses->sectype == Unspecified) {
412 if (ses->user_name == NULL)
413 seq_puts(s, ",sec=none");
417 seq_puts(s, ",sec=");
419 switch (ses->sectype) {
421 seq_puts(s, "lanman");
424 seq_puts(s, "ntlmv2");
433 seq_puts(s, "ntlmssp");
436 /* shouldn't ever happen */
437 seq_puts(s, "unknown");
444 if (ses->sectype == Kerberos)
445 seq_printf(s, ",cruid=%u",
446 from_kuid_munged(&init_user_ns, ses->cred_uid));
450 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
452 seq_puts(s, ",cache=");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
455 seq_puts(s, "strict");
456 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
458 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
459 seq_puts(s, "singleclient"); /* assume only one client access */
460 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
461 seq_puts(s, "ro"); /* read only caching assumed */
463 seq_puts(s, "loose");
467 * cifs_show_devname() is used so we show the mount device name with correct
468 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
470 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
472 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
473 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
478 convert_delimiter(devname, '/');
479 seq_puts(m, devname);
486 * cifs_show_options() is for displaying mount options in /proc/mounts.
487 * Not all settable options are displayed but most of the important
491 cifs_show_options(struct seq_file *s, struct dentry *root)
493 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
494 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
495 struct sockaddr *srcaddr;
496 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
498 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
499 cifs_show_security(s, tcon->ses);
500 cifs_show_cache_flavor(s, cifs_sb);
503 seq_puts(s, ",nolease");
504 if (cifs_sb->ctx->multiuser)
505 seq_puts(s, ",multiuser");
506 else if (tcon->ses->user_name)
507 seq_show_option(s, "username", tcon->ses->user_name);
509 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
510 seq_show_option(s, "domain", tcon->ses->domainName);
512 if (srcaddr->sa_family != AF_UNSPEC) {
513 struct sockaddr_in *saddr4;
514 struct sockaddr_in6 *saddr6;
515 saddr4 = (struct sockaddr_in *)srcaddr;
516 saddr6 = (struct sockaddr_in6 *)srcaddr;
517 if (srcaddr->sa_family == AF_INET6)
518 seq_printf(s, ",srcaddr=%pI6c",
520 else if (srcaddr->sa_family == AF_INET)
521 seq_printf(s, ",srcaddr=%pI4",
522 &saddr4->sin_addr.s_addr);
524 seq_printf(s, ",srcaddr=BAD-AF:%i",
525 (int)(srcaddr->sa_family));
528 seq_printf(s, ",uid=%u",
529 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
530 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
531 seq_puts(s, ",forceuid");
533 seq_puts(s, ",noforceuid");
535 seq_printf(s, ",gid=%u",
536 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
537 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
538 seq_puts(s, ",forcegid");
540 seq_puts(s, ",noforcegid");
542 cifs_show_address(s, tcon->ses->server);
545 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
546 cifs_sb->ctx->file_mode,
547 cifs_sb->ctx->dir_mode);
548 if (cifs_sb->ctx->iocharset)
549 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
551 seq_puts(s, ",seal");
552 else if (tcon->ses->server->ignore_signature)
553 seq_puts(s, ",signloosely");
555 seq_puts(s, ",nocase");
557 seq_puts(s, ",nodelete");
558 if (tcon->local_lease)
559 seq_puts(s, ",locallease");
561 seq_puts(s, ",hard");
563 seq_puts(s, ",soft");
564 if (tcon->use_persistent)
565 seq_puts(s, ",persistenthandles");
566 else if (tcon->use_resilient)
567 seq_puts(s, ",resilienthandles");
568 if (tcon->posix_extensions)
569 seq_puts(s, ",posix");
570 else if (tcon->unix_ext)
571 seq_puts(s, ",unix");
573 seq_puts(s, ",nounix");
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
575 seq_puts(s, ",nodfs");
576 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
577 seq_puts(s, ",posixpaths");
578 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
579 seq_puts(s, ",setuids");
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
581 seq_puts(s, ",idsfromsid");
582 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
583 seq_puts(s, ",serverino");
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
585 seq_puts(s, ",rwpidforward");
586 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
587 seq_puts(s, ",forcemand");
588 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
589 seq_puts(s, ",nouser_xattr");
590 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
591 seq_puts(s, ",mapchars");
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
593 seq_puts(s, ",mapposix");
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
597 seq_puts(s, ",nobrl");
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
599 seq_puts(s, ",nohandlecache");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
601 seq_puts(s, ",modefromsid");
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
603 seq_puts(s, ",cifsacl");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
605 seq_puts(s, ",dynperm");
606 if (root->d_sb->s_flags & SB_POSIXACL)
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
609 seq_puts(s, ",mfsymlinks");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
613 seq_puts(s, ",nostrictsync");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
615 seq_puts(s, ",noperm");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
617 seq_printf(s, ",backupuid=%u",
618 from_kuid_munged(&init_user_ns,
619 cifs_sb->ctx->backupuid));
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
621 seq_printf(s, ",backupgid=%u",
622 from_kgid_munged(&init_user_ns,
623 cifs_sb->ctx->backupgid));
625 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
626 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
627 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
628 if (tcon->ses->server->min_offload)
629 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
630 seq_printf(s, ",echo_interval=%lu",
631 tcon->ses->server->echo_interval / HZ);
633 /* Only display max_credits if it was overridden on mount */
634 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
635 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
637 if (tcon->snapshot_time)
638 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
639 if (tcon->handle_timeout)
640 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
641 /* convert actimeo and display it in seconds */
642 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->actimeo / HZ);
644 if (tcon->ses->chan_max > 1)
645 seq_printf(s, ",multichannel,max_channels=%zu",
646 tcon->ses->chan_max);
648 #ifdef CONFIG_CIFS_SWN_UPCALL
649 if (tcon->use_witness)
650 seq_puts(s, ",witness");
656 static void cifs_umount_begin(struct super_block *sb)
658 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
659 struct cifs_tcon *tcon;
664 tcon = cifs_sb_master_tcon(cifs_sb);
666 spin_lock(&cifs_tcp_ses_lock);
667 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
668 /* we have other mounts to same share or we have
669 already tried to force umount this and woken up
670 all waiting network requests, nothing to do */
671 spin_unlock(&cifs_tcp_ses_lock);
673 } else if (tcon->tc_count == 1)
674 tcon->tidStatus = CifsExiting;
675 spin_unlock(&cifs_tcp_ses_lock);
677 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
678 /* cancel_notify_requests(tcon); */
679 if (tcon->ses && tcon->ses->server) {
680 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
681 wake_up_all(&tcon->ses->server->request_q);
682 wake_up_all(&tcon->ses->server->response_q);
683 msleep(1); /* yield */
684 /* we have to kick the requests once more */
685 wake_up_all(&tcon->ses->server->response_q);
692 #ifdef CONFIG_CIFS_STATS2
693 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
700 static int cifs_drop_inode(struct inode *inode)
702 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
704 /* no serverino => unconditional eviction */
705 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
706 generic_drop_inode(inode);
709 static const struct super_operations cifs_super_ops = {
710 .statfs = cifs_statfs,
711 .alloc_inode = cifs_alloc_inode,
712 .free_inode = cifs_free_inode,
713 .drop_inode = cifs_drop_inode,
714 .evict_inode = cifs_evict_inode,
715 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
716 .show_devname = cifs_show_devname,
717 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
718 function unless later we add lazy close of inodes or unless the
719 kernel forgets to call us with the same number of releases (closes)
721 .show_options = cifs_show_options,
722 .umount_begin = cifs_umount_begin,
723 #ifdef CONFIG_CIFS_STATS2
724 .show_stats = cifs_show_stats,
729 * Get root dentry from superblock according to prefix path mount option.
730 * Return dentry with refcount + 1 on success and NULL otherwise.
732 static struct dentry *
733 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
735 struct dentry *dentry;
736 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
737 char *full_path = NULL;
741 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
742 return dget(sb->s_root);
744 full_path = cifs_build_path_to_root(ctx, cifs_sb,
745 cifs_sb_master_tcon(cifs_sb), 0);
746 if (full_path == NULL)
747 return ERR_PTR(-ENOMEM);
749 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
751 sep = CIFS_DIR_SEP(cifs_sb);
752 dentry = dget(sb->s_root);
756 struct inode *dir = d_inode(dentry);
757 struct dentry *child;
759 if (!S_ISDIR(dir->i_mode)) {
761 dentry = ERR_PTR(-ENOTDIR);
765 /* skip separators */
772 while (*s && *s != sep)
775 child = lookup_positive_unlocked(p, dentry, s - p);
778 } while (!IS_ERR(dentry));
783 static int cifs_set_super(struct super_block *sb, void *data)
785 struct cifs_mnt_data *mnt_data = data;
786 sb->s_fs_info = mnt_data->cifs_sb;
787 return set_anon_super(sb, NULL);
791 cifs_smb3_do_mount(struct file_system_type *fs_type,
792 int flags, struct smb3_fs_context *old_ctx)
795 struct super_block *sb;
796 struct cifs_sb_info *cifs_sb = NULL;
797 struct cifs_mnt_data mnt_data;
801 * Prints in Kernel / CIFS log the attempted mount operation
802 * If CIFS_DEBUG && cifs_FYI
805 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
807 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
809 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
810 if (cifs_sb == NULL) {
811 root = ERR_PTR(-ENOMEM);
815 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
817 root = ERR_PTR(-ENOMEM);
820 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
826 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC);
832 rc = cifs_setup_cifs_sb(cifs_sb);
838 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
840 if (!(flags & SB_SILENT))
841 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
847 mnt_data.ctx = cifs_sb->ctx;
848 mnt_data.cifs_sb = cifs_sb;
849 mnt_data.flags = flags;
851 /* BB should we make this contingent on mount parm? */
852 flags |= SB_NODIRATIME | SB_NOATIME;
854 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
857 cifs_umount(cifs_sb);
863 cifs_dbg(FYI, "Use existing superblock\n");
864 cifs_umount(cifs_sb);
867 rc = cifs_read_super(sb);
873 sb->s_flags |= SB_ACTIVE;
876 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
880 cifs_dbg(FYI, "dentry root is: %p\n", root);
884 deactivate_locked_super(sb);
887 kfree(cifs_sb->prepath);
888 smb3_cleanup_fs_context(cifs_sb->ctx);
896 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
899 struct inode *inode = file_inode(iocb->ki_filp);
901 if (iocb->ki_filp->f_flags & O_DIRECT)
902 return cifs_user_readv(iocb, iter);
904 rc = cifs_revalidate_mapping(inode);
908 return generic_file_read_iter(iocb, iter);
911 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
913 struct inode *inode = file_inode(iocb->ki_filp);
914 struct cifsInodeInfo *cinode = CIFS_I(inode);
918 if (iocb->ki_filp->f_flags & O_DIRECT) {
919 written = cifs_user_writev(iocb, from);
920 if (written > 0 && CIFS_CACHE_READ(cinode)) {
921 cifs_zap_mapping(inode);
923 "Set no oplock for inode=%p after a write operation\n",
930 written = cifs_get_writer(cinode);
934 written = generic_file_write_iter(iocb, from);
936 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
939 rc = filemap_fdatawrite(inode->i_mapping);
941 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
945 cifs_put_writer(cinode);
949 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
951 struct cifsFileInfo *cfile = file->private_data;
952 struct cifs_tcon *tcon;
955 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
956 * the cached file length
958 if (whence != SEEK_SET && whence != SEEK_CUR) {
960 struct inode *inode = file_inode(file);
963 * We need to be sure that all dirty pages are written and the
964 * server has the newest file length.
966 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
967 inode->i_mapping->nrpages != 0) {
968 rc = filemap_fdatawait(inode->i_mapping);
970 mapping_set_error(inode->i_mapping, rc);
975 * Some applications poll for the file length in this strange
976 * way so we must seek to end on non-oplocked files by
977 * setting the revalidate time to zero.
979 CIFS_I(inode)->time = 0;
981 rc = cifs_revalidate_file_attr(file);
985 if (cfile && cfile->tlink) {
986 tcon = tlink_tcon(cfile->tlink);
987 if (tcon->ses->server->ops->llseek)
988 return tcon->ses->server->ops->llseek(file, tcon,
991 return generic_file_llseek(file, offset, whence);
995 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
998 * Note that this is called by vfs setlease with i_lock held to
999 * protect *lease from going away.
1001 struct inode *inode = file_inode(file);
1002 struct cifsFileInfo *cfile = file->private_data;
1004 if (!(S_ISREG(inode->i_mode)))
1007 /* Check if file is oplocked if this is request for new lease */
1008 if (arg == F_UNLCK ||
1009 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1010 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1011 return generic_setlease(file, arg, lease, priv);
1012 else if (tlink_tcon(cfile->tlink)->local_lease &&
1013 !CIFS_CACHE_READ(CIFS_I(inode)))
1015 * If the server claims to support oplock on this file, then we
1016 * still need to check oplock even if the local_lease mount
1017 * option is set, but there are servers which do not support
1018 * oplock for which this mount option may be useful if the user
1019 * knows that the file won't be changed on the server by anyone
1022 return generic_setlease(file, arg, lease, priv);
1027 struct file_system_type cifs_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("cifs");
1037 static struct file_system_type smb3_fs_type = {
1038 .owner = THIS_MODULE,
1040 .init_fs_context = smb3_init_fs_context,
1041 .parameters = smb3_fs_parameters,
1042 .kill_sb = cifs_kill_sb,
1043 .fs_flags = FS_RENAME_DOES_D_MOVE,
1045 MODULE_ALIAS_FS("smb3");
1046 MODULE_ALIAS("smb3");
1048 const struct inode_operations cifs_dir_inode_ops = {
1049 .create = cifs_create,
1050 .atomic_open = cifs_atomic_open,
1051 .lookup = cifs_lookup,
1052 .getattr = cifs_getattr,
1053 .unlink = cifs_unlink,
1054 .link = cifs_hardlink,
1055 .mkdir = cifs_mkdir,
1056 .rmdir = cifs_rmdir,
1057 .rename = cifs_rename2,
1058 .permission = cifs_permission,
1059 .setattr = cifs_setattr,
1060 .symlink = cifs_symlink,
1061 .mknod = cifs_mknod,
1062 .listxattr = cifs_listxattr,
1065 const struct inode_operations cifs_file_inode_ops = {
1066 .setattr = cifs_setattr,
1067 .getattr = cifs_getattr,
1068 .permission = cifs_permission,
1069 .listxattr = cifs_listxattr,
1070 .fiemap = cifs_fiemap,
1073 const struct inode_operations cifs_symlink_inode_ops = {
1074 .get_link = cifs_get_link,
1075 .permission = cifs_permission,
1076 .listxattr = cifs_listxattr,
1079 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1080 struct file *dst_file, loff_t destoff, loff_t len,
1081 unsigned int remap_flags)
1083 struct inode *src_inode = file_inode(src_file);
1084 struct inode *target_inode = file_inode(dst_file);
1085 struct cifsFileInfo *smb_file_src = src_file->private_data;
1086 struct cifsFileInfo *smb_file_target;
1087 struct cifs_tcon *target_tcon;
1091 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1094 cifs_dbg(FYI, "clone range\n");
1098 if (!src_file->private_data || !dst_file->private_data) {
1100 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1104 smb_file_target = dst_file->private_data;
1105 target_tcon = tlink_tcon(smb_file_target->tlink);
1108 * Note: cifs case is easier than btrfs since server responsible for
1109 * checks for proper open modes and file type and if it wants
1110 * server could even support copy of range where source = target
1112 lock_two_nondirectories(target_inode, src_inode);
1115 len = src_inode->i_size - off;
1117 cifs_dbg(FYI, "about to flush pages\n");
1118 /* should we flush first and last page first */
1119 truncate_inode_pages_range(&target_inode->i_data, destoff,
1120 PAGE_ALIGN(destoff + len)-1);
1122 if (target_tcon->ses->server->ops->duplicate_extents)
1123 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1124 smb_file_src, smb_file_target, off, len, destoff);
1128 /* force revalidate of size and timestamps of target file now
1129 that target is updated on the server */
1130 CIFS_I(target_inode)->time = 0;
1131 /* although unlocking in the reverse order from locking is not
1132 strictly necessary here it is a little cleaner to be consistent */
1133 unlock_two_nondirectories(src_inode, target_inode);
1136 return rc < 0 ? rc : len;
1139 ssize_t cifs_file_copychunk_range(unsigned int xid,
1140 struct file *src_file, loff_t off,
1141 struct file *dst_file, loff_t destoff,
1142 size_t len, unsigned int flags)
1144 struct inode *src_inode = file_inode(src_file);
1145 struct inode *target_inode = file_inode(dst_file);
1146 struct cifsFileInfo *smb_file_src;
1147 struct cifsFileInfo *smb_file_target;
1148 struct cifs_tcon *src_tcon;
1149 struct cifs_tcon *target_tcon;
1152 cifs_dbg(FYI, "copychunk range\n");
1154 if (!src_file->private_data || !dst_file->private_data) {
1156 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1161 smb_file_target = dst_file->private_data;
1162 smb_file_src = src_file->private_data;
1163 src_tcon = tlink_tcon(smb_file_src->tlink);
1164 target_tcon = tlink_tcon(smb_file_target->tlink);
1166 if (src_tcon->ses != target_tcon->ses) {
1167 cifs_dbg(VFS, "source and target of copy not on same server\n");
1172 if (!target_tcon->ses->server->ops->copychunk_range)
1176 * Note: cifs case is easier than btrfs since server responsible for
1177 * checks for proper open modes and file type and if it wants
1178 * server could even support copy of range where source = target
1180 lock_two_nondirectories(target_inode, src_inode);
1182 cifs_dbg(FYI, "about to flush pages\n");
1183 /* should we flush first and last page first */
1184 truncate_inode_pages(&target_inode->i_data, 0);
1186 rc = file_modified(dst_file);
1188 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1189 smb_file_src, smb_file_target, off, len, destoff);
1191 file_accessed(src_file);
1193 /* force revalidate of size and timestamps of target file now
1194 * that target is updated on the server
1196 CIFS_I(target_inode)->time = 0;
1197 /* although unlocking in the reverse order from locking is not
1198 * strictly necessary here it is a little cleaner to be consistent
1200 unlock_two_nondirectories(src_inode, target_inode);
1207 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1208 * is a dummy operation.
1210 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1212 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1218 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1219 struct file *dst_file, loff_t destoff,
1220 size_t len, unsigned int flags)
1222 unsigned int xid = get_xid();
1224 struct cifsFileInfo *cfile = dst_file->private_data;
1226 if (cfile->swapfile)
1229 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1233 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1234 rc = generic_copy_file_range(src_file, off, dst_file,
1235 destoff, len, flags);
1239 const struct file_operations cifs_file_ops = {
1240 .read_iter = cifs_loose_read_iter,
1241 .write_iter = cifs_file_write_iter,
1243 .release = cifs_close,
1245 .flock = cifs_flock,
1246 .fsync = cifs_fsync,
1247 .flush = cifs_flush,
1248 .mmap = cifs_file_mmap,
1249 .splice_read = generic_file_splice_read,
1250 .splice_write = iter_file_splice_write,
1251 .llseek = cifs_llseek,
1252 .unlocked_ioctl = cifs_ioctl,
1253 .copy_file_range = cifs_copy_file_range,
1254 .remap_file_range = cifs_remap_file_range,
1255 .setlease = cifs_setlease,
1256 .fallocate = cifs_fallocate,
1259 const struct file_operations cifs_file_strict_ops = {
1260 .read_iter = cifs_strict_readv,
1261 .write_iter = cifs_strict_writev,
1263 .release = cifs_close,
1265 .flock = cifs_flock,
1266 .fsync = cifs_strict_fsync,
1267 .flush = cifs_flush,
1268 .mmap = cifs_file_strict_mmap,
1269 .splice_read = generic_file_splice_read,
1270 .splice_write = iter_file_splice_write,
1271 .llseek = cifs_llseek,
1272 .unlocked_ioctl = cifs_ioctl,
1273 .copy_file_range = cifs_copy_file_range,
1274 .remap_file_range = cifs_remap_file_range,
1275 .setlease = cifs_setlease,
1276 .fallocate = cifs_fallocate,
1279 const struct file_operations cifs_file_direct_ops = {
1280 .read_iter = cifs_direct_readv,
1281 .write_iter = cifs_direct_writev,
1283 .release = cifs_close,
1285 .flock = cifs_flock,
1286 .fsync = cifs_fsync,
1287 .flush = cifs_flush,
1288 .mmap = cifs_file_mmap,
1289 .splice_read = generic_file_splice_read,
1290 .splice_write = iter_file_splice_write,
1291 .unlocked_ioctl = cifs_ioctl,
1292 .copy_file_range = cifs_copy_file_range,
1293 .remap_file_range = cifs_remap_file_range,
1294 .llseek = cifs_llseek,
1295 .setlease = cifs_setlease,
1296 .fallocate = cifs_fallocate,
1299 const struct file_operations cifs_file_nobrl_ops = {
1300 .read_iter = cifs_loose_read_iter,
1301 .write_iter = cifs_file_write_iter,
1303 .release = cifs_close,
1304 .fsync = cifs_fsync,
1305 .flush = cifs_flush,
1306 .mmap = cifs_file_mmap,
1307 .splice_read = generic_file_splice_read,
1308 .splice_write = iter_file_splice_write,
1309 .llseek = cifs_llseek,
1310 .unlocked_ioctl = cifs_ioctl,
1311 .copy_file_range = cifs_copy_file_range,
1312 .remap_file_range = cifs_remap_file_range,
1313 .setlease = cifs_setlease,
1314 .fallocate = cifs_fallocate,
1317 const struct file_operations cifs_file_strict_nobrl_ops = {
1318 .read_iter = cifs_strict_readv,
1319 .write_iter = cifs_strict_writev,
1321 .release = cifs_close,
1322 .fsync = cifs_strict_fsync,
1323 .flush = cifs_flush,
1324 .mmap = cifs_file_strict_mmap,
1325 .splice_read = generic_file_splice_read,
1326 .splice_write = iter_file_splice_write,
1327 .llseek = cifs_llseek,
1328 .unlocked_ioctl = cifs_ioctl,
1329 .copy_file_range = cifs_copy_file_range,
1330 .remap_file_range = cifs_remap_file_range,
1331 .setlease = cifs_setlease,
1332 .fallocate = cifs_fallocate,
1335 const struct file_operations cifs_file_direct_nobrl_ops = {
1336 .read_iter = cifs_direct_readv,
1337 .write_iter = cifs_direct_writev,
1339 .release = cifs_close,
1340 .fsync = cifs_fsync,
1341 .flush = cifs_flush,
1342 .mmap = cifs_file_mmap,
1343 .splice_read = generic_file_splice_read,
1344 .splice_write = iter_file_splice_write,
1345 .unlocked_ioctl = cifs_ioctl,
1346 .copy_file_range = cifs_copy_file_range,
1347 .remap_file_range = cifs_remap_file_range,
1348 .llseek = cifs_llseek,
1349 .setlease = cifs_setlease,
1350 .fallocate = cifs_fallocate,
1353 const struct file_operations cifs_dir_ops = {
1354 .iterate_shared = cifs_readdir,
1355 .release = cifs_closedir,
1356 .read = generic_read_dir,
1357 .unlocked_ioctl = cifs_ioctl,
1358 .copy_file_range = cifs_copy_file_range,
1359 .remap_file_range = cifs_remap_file_range,
1360 .llseek = generic_file_llseek,
1361 .fsync = cifs_dir_fsync,
1365 cifs_init_once(void *inode)
1367 struct cifsInodeInfo *cifsi = inode;
1369 inode_init_once(&cifsi->vfs_inode);
1370 init_rwsem(&cifsi->lock_sem);
1374 cifs_init_inodecache(void)
1376 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1377 sizeof(struct cifsInodeInfo),
1378 0, (SLAB_RECLAIM_ACCOUNT|
1379 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1381 if (cifs_inode_cachep == NULL)
1388 cifs_destroy_inodecache(void)
1391 * Make sure all delayed rcu free inodes are flushed before we
1395 kmem_cache_destroy(cifs_inode_cachep);
1399 cifs_init_request_bufs(void)
1402 * SMB2 maximum header size is bigger than CIFS one - no problems to
1403 * allocate some more bytes for CIFS.
1405 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1407 if (CIFSMaxBufSize < 8192) {
1408 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1409 Unicode path name has to fit in any SMB/CIFS path based frames */
1410 CIFSMaxBufSize = 8192;
1411 } else if (CIFSMaxBufSize > 1024*127) {
1412 CIFSMaxBufSize = 1024 * 127;
1414 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1417 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1418 CIFSMaxBufSize, CIFSMaxBufSize);
1420 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1421 CIFSMaxBufSize + max_hdr_size, 0,
1422 SLAB_HWCACHE_ALIGN, 0,
1423 CIFSMaxBufSize + max_hdr_size,
1425 if (cifs_req_cachep == NULL)
1428 if (cifs_min_rcv < 1)
1430 else if (cifs_min_rcv > 64) {
1432 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1435 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1438 if (cifs_req_poolp == NULL) {
1439 kmem_cache_destroy(cifs_req_cachep);
1442 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1443 almost all handle based requests (but not write response, nor is it
1444 sufficient for path based requests). A smaller size would have
1445 been more efficient (compacting multiple slab items on one 4k page)
1446 for the case in which debug was on, but this larger size allows
1447 more SMBs to use small buffer alloc and is still much more
1448 efficient to alloc 1 per page off the slab compared to 17K (5page)
1449 alloc of large cifs buffers even when page debugging is on */
1450 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1451 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1452 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1453 if (cifs_sm_req_cachep == NULL) {
1454 mempool_destroy(cifs_req_poolp);
1455 kmem_cache_destroy(cifs_req_cachep);
1459 if (cifs_min_small < 2)
1461 else if (cifs_min_small > 256) {
1462 cifs_min_small = 256;
1463 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1466 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1467 cifs_sm_req_cachep);
1469 if (cifs_sm_req_poolp == NULL) {
1470 mempool_destroy(cifs_req_poolp);
1471 kmem_cache_destroy(cifs_req_cachep);
1472 kmem_cache_destroy(cifs_sm_req_cachep);
1480 cifs_destroy_request_bufs(void)
1482 mempool_destroy(cifs_req_poolp);
1483 kmem_cache_destroy(cifs_req_cachep);
1484 mempool_destroy(cifs_sm_req_poolp);
1485 kmem_cache_destroy(cifs_sm_req_cachep);
1489 cifs_init_mids(void)
1491 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1492 sizeof(struct mid_q_entry), 0,
1493 SLAB_HWCACHE_ALIGN, NULL);
1494 if (cifs_mid_cachep == NULL)
1497 /* 3 is a reasonable minimum number of simultaneous operations */
1498 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1499 if (cifs_mid_poolp == NULL) {
1500 kmem_cache_destroy(cifs_mid_cachep);
1508 cifs_destroy_mids(void)
1510 mempool_destroy(cifs_mid_poolp);
1511 kmem_cache_destroy(cifs_mid_cachep);
1519 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1520 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1521 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1522 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1523 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1525 * Initialize Global counters
1527 atomic_set(&sesInfoAllocCount, 0);
1528 atomic_set(&tconInfoAllocCount, 0);
1529 atomic_set(&tcpSesAllocCount, 0);
1530 atomic_set(&tcpSesReconnectCount, 0);
1531 atomic_set(&tconInfoReconnectCount, 0);
1533 atomic_set(&bufAllocCount, 0);
1534 atomic_set(&smBufAllocCount, 0);
1535 #ifdef CONFIG_CIFS_STATS2
1536 atomic_set(&totBufAllocCount, 0);
1537 atomic_set(&totSmBufAllocCount, 0);
1538 if (slow_rsp_threshold < 1)
1539 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1540 else if (slow_rsp_threshold > 32767)
1542 "slow response threshold set higher than recommended (0 to 32767)\n");
1543 #endif /* CONFIG_CIFS_STATS2 */
1545 atomic_set(&midCount, 0);
1546 GlobalCurrentXid = 0;
1547 GlobalTotalActiveXid = 0;
1548 GlobalMaxActiveXid = 0;
1549 spin_lock_init(&cifs_tcp_ses_lock);
1550 spin_lock_init(&GlobalMid_Lock);
1552 cifs_lock_secret = get_random_u32();
1554 if (cifs_max_pending < 2) {
1555 cifs_max_pending = 2;
1556 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1557 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1558 cifs_max_pending = CIFS_MAX_REQ;
1559 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1563 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1566 goto out_clean_proc;
1570 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1571 * so that we don't launch too many worker threads but
1572 * Documentation/core-api/workqueue.rst recommends setting it to 0
1575 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1576 decrypt_wq = alloc_workqueue("smb3decryptd",
1577 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1580 goto out_destroy_cifsiod_wq;
1583 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1584 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1585 if (!fileinfo_put_wq) {
1587 goto out_destroy_decrypt_wq;
1590 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1591 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1592 if (!cifsoplockd_wq) {
1594 goto out_destroy_fileinfo_put_wq;
1597 rc = cifs_fscache_register();
1599 goto out_destroy_cifsoplockd_wq;
1601 rc = cifs_init_inodecache();
1603 goto out_unreg_fscache;
1605 rc = cifs_init_mids();
1607 goto out_destroy_inodecache;
1609 rc = cifs_init_request_bufs();
1611 goto out_destroy_mids;
1613 #ifdef CONFIG_CIFS_DFS_UPCALL
1614 rc = dfs_cache_init();
1616 goto out_destroy_request_bufs;
1617 #endif /* CONFIG_CIFS_DFS_UPCALL */
1618 #ifdef CONFIG_CIFS_UPCALL
1619 rc = init_cifs_spnego();
1621 goto out_destroy_dfs_cache;
1622 #endif /* CONFIG_CIFS_UPCALL */
1623 #ifdef CONFIG_CIFS_SWN_UPCALL
1624 rc = cifs_genl_init();
1626 goto out_register_key_type;
1627 #endif /* CONFIG_CIFS_SWN_UPCALL */
1629 rc = init_cifs_idmap();
1631 goto out_cifs_swn_init;
1633 rc = register_filesystem(&cifs_fs_type);
1635 goto out_init_cifs_idmap;
1637 rc = register_filesystem(&smb3_fs_type);
1639 unregister_filesystem(&cifs_fs_type);
1640 goto out_init_cifs_idmap;
1645 out_init_cifs_idmap:
1648 #ifdef CONFIG_CIFS_SWN_UPCALL
1650 out_register_key_type:
1652 #ifdef CONFIG_CIFS_UPCALL
1654 out_destroy_dfs_cache:
1656 #ifdef CONFIG_CIFS_DFS_UPCALL
1657 dfs_cache_destroy();
1658 out_destroy_request_bufs:
1660 cifs_destroy_request_bufs();
1662 cifs_destroy_mids();
1663 out_destroy_inodecache:
1664 cifs_destroy_inodecache();
1666 cifs_fscache_unregister();
1667 out_destroy_cifsoplockd_wq:
1668 destroy_workqueue(cifsoplockd_wq);
1669 out_destroy_fileinfo_put_wq:
1670 destroy_workqueue(fileinfo_put_wq);
1671 out_destroy_decrypt_wq:
1672 destroy_workqueue(decrypt_wq);
1673 out_destroy_cifsiod_wq:
1674 destroy_workqueue(cifsiod_wq);
1683 cifs_dbg(NOISY, "exit_smb3\n");
1684 unregister_filesystem(&cifs_fs_type);
1685 unregister_filesystem(&smb3_fs_type);
1686 cifs_dfs_release_automount_timer();
1688 #ifdef CONFIG_CIFS_SWN_UPCALL
1691 #ifdef CONFIG_CIFS_UPCALL
1694 #ifdef CONFIG_CIFS_DFS_UPCALL
1695 dfs_cache_destroy();
1697 cifs_destroy_request_bufs();
1698 cifs_destroy_mids();
1699 cifs_destroy_inodecache();
1700 cifs_fscache_unregister();
1701 destroy_workqueue(cifsoplockd_wq);
1702 destroy_workqueue(decrypt_wq);
1703 destroy_workqueue(fileinfo_put_wq);
1704 destroy_workqueue(cifsiod_wq);
1708 MODULE_AUTHOR("Steve French");
1709 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1711 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1712 "also older servers complying with the SNIA CIFS Specification)");
1713 MODULE_VERSION(CIFS_VERSION);
1714 MODULE_SOFTDEP("ecb");
1715 MODULE_SOFTDEP("hmac");
1716 MODULE_SOFTDEP("md4");
1717 MODULE_SOFTDEP("md5");
1718 MODULE_SOFTDEP("nls");
1719 MODULE_SOFTDEP("aes");
1720 MODULE_SOFTDEP("cmac");
1721 MODULE_SOFTDEP("sha256");
1722 MODULE_SOFTDEP("sha512");
1723 MODULE_SOFTDEP("aead2");
1724 MODULE_SOFTDEP("ccm");
1725 MODULE_SOFTDEP("gcm");
1726 module_init(init_cifs)
1727 module_exit(exit_cifs)