1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2008
7 * Common Internet FileSystem (CIFS) client
11 /* Note that BB means BUGBUG (ie something to fix eventually) */
13 #include <linux/module.h>
15 #include <linux/mount.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/seq_file.h>
20 #include <linux/vfs.h>
21 #include <linux/mempool.h>
22 #include <linux/delay.h>
23 #include <linux/kthread.h>
24 #include <linux/freezer.h>
25 #include <linux/namei.h>
26 #include <linux/random.h>
27 #include <linux/uuid.h>
28 #include <linux/xattr.h>
32 #define DECLARE_GLOBALS_HERE
34 #include "cifsproto.h"
35 #include "cifs_debug.h"
36 #include "cifs_fs_sb.h"
38 #include <linux/key-type.h>
39 #include "cifs_spnego.h"
41 #ifdef CONFIG_CIFS_DFS_UPCALL
42 #include "dfs_cache.h"
44 #ifdef CONFIG_CIFS_SWN_UPCALL
47 #include "fs_context.h"
50 * DOS dates from 1980/1/1 through 2107/12/31
51 * Protocol specifications indicate the range should be to 119, which
52 * limits maximum year to 2099. But this range has not been checked.
54 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
55 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
56 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
60 bool enable_oplocks = true;
61 bool linuxExtEnabled = true;
62 bool lookupCacheEnabled = true;
63 bool disable_legacy_dialects; /* false by default */
64 bool enable_gcm_256 = true;
65 bool require_gcm_256; /* false by default */
66 bool enable_negotiate_signing; /* false by default */
67 unsigned int global_secflags = CIFSSEC_DEF;
68 /* unsigned int ntlmv2_support = 0; */
69 unsigned int sign_CIFS_PDUs = 1;
70 static const struct super_operations cifs_super_ops;
71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
72 module_param(CIFSMaxBufSize, uint, 0444);
73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
75 "Default: 16384 Range: 8192 to 130048");
76 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
77 module_param(cifs_min_rcv, uint, 0444);
78 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
80 unsigned int cifs_min_small = 30;
81 module_param(cifs_min_small, uint, 0444);
82 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
84 unsigned int cifs_max_pending = CIFS_MAX_REQ;
85 module_param(cifs_max_pending, uint, 0444);
86 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
87 "CIFS/SMB1 dialect (N/A for SMB3) "
88 "Default: 32767 Range: 2 to 32767.");
89 #ifdef CONFIG_CIFS_STATS2
90 unsigned int slow_rsp_threshold = 1;
91 module_param(slow_rsp_threshold, uint, 0644);
92 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
93 "before logging that a response is delayed. "
94 "Default: 1 (if set to 0 disables msg).");
97 module_param(enable_oplocks, bool, 0644);
98 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
100 module_param(enable_gcm_256, bool, 0644);
101 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
103 module_param(require_gcm_256, bool, 0644);
104 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
106 module_param(enable_negotiate_signing, bool, 0644);
107 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
109 module_param(disable_legacy_dialects, bool, 0644);
110 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
111 "helpful to restrict the ability to "
112 "override the default dialects (SMB2.1, "
113 "SMB3 and SMB3.02) on mount with old "
114 "dialects (CIFS/SMB1 and SMB2) since "
115 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
116 " and less secure. Default: n/N/0");
118 extern mempool_t *cifs_sm_req_poolp;
119 extern mempool_t *cifs_req_poolp;
120 extern mempool_t *cifs_mid_poolp;
122 struct workqueue_struct *cifsiod_wq;
123 struct workqueue_struct *decrypt_wq;
124 struct workqueue_struct *fileinfo_put_wq;
125 struct workqueue_struct *cifsoplockd_wq;
126 struct workqueue_struct *deferredclose_wq;
127 __u32 cifs_lock_secret;
130 * Bumps refcount for cifs super block.
131 * Note that it should be only called if a referece to VFS super block is
132 * already held, e.g. in open-type syscalls context. Otherwise it can race with
133 * atomic_dec_and_test in deactivate_locked_super.
136 cifs_sb_active(struct super_block *sb)
138 struct cifs_sb_info *server = CIFS_SB(sb);
140 if (atomic_inc_return(&server->active) == 1)
141 atomic_inc(&sb->s_active);
145 cifs_sb_deactive(struct super_block *sb)
147 struct cifs_sb_info *server = CIFS_SB(sb);
149 if (atomic_dec_and_test(&server->active))
150 deactivate_super(sb);
154 cifs_read_super(struct super_block *sb)
157 struct cifs_sb_info *cifs_sb;
158 struct cifs_tcon *tcon;
159 struct timespec64 ts;
162 cifs_sb = CIFS_SB(sb);
163 tcon = cifs_sb_master_tcon(cifs_sb);
165 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
166 sb->s_flags |= SB_POSIXACL;
168 if (tcon->snapshot_time)
169 sb->s_flags |= SB_RDONLY;
171 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
172 sb->s_maxbytes = MAX_LFS_FILESIZE;
174 sb->s_maxbytes = MAX_NON_LFS;
177 * Some very old servers like DOS and OS/2 used 2 second granularity
178 * (while all current servers use 100ns granularity - see MS-DTYP)
179 * but 1 second is the maximum allowed granularity for the VFS
180 * so for old servers set time granularity to 1 second while for
181 * everything else (current servers) set it to 100ns.
183 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
184 ((tcon->ses->capabilities &
185 tcon->ses->server->vals->cap_nt_find) == 0) &&
187 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
188 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
189 sb->s_time_min = ts.tv_sec;
190 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
191 cpu_to_le16(SMB_TIME_MAX), 0);
192 sb->s_time_max = ts.tv_sec;
195 * Almost every server, including all SMB2+, uses DCE TIME
196 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
198 sb->s_time_gran = 100;
199 ts = cifs_NTtimeToUnix(0);
200 sb->s_time_min = ts.tv_sec;
201 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
202 sb->s_time_max = ts.tv_sec;
205 sb->s_magic = CIFS_MAGIC_NUMBER;
206 sb->s_op = &cifs_super_ops;
207 sb->s_xattr = cifs_xattr_handlers;
208 rc = super_setup_bdi(sb);
211 /* tune readahead according to rsize if readahead size not set on mount */
212 if (cifs_sb->ctx->rasize)
213 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
215 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
217 sb->s_blocksize = CIFS_MAX_MSGSIZE;
218 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
219 inode = cifs_root_iget(sb);
227 sb->s_d_op = &cifs_ci_dentry_ops;
229 sb->s_d_op = &cifs_dentry_ops;
231 sb->s_root = d_make_root(inode);
237 #ifdef CONFIG_CIFS_NFSD_EXPORT
238 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
239 cifs_dbg(FYI, "export ops supported\n");
240 sb->s_export_op = &cifs_export_ops;
242 #endif /* CONFIG_CIFS_NFSD_EXPORT */
247 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
251 static void cifs_kill_sb(struct super_block *sb)
253 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
254 struct cifs_tcon *tcon;
255 struct cached_fid *cfid;
258 * We ned to release all dentries for the cached directories
259 * before we kill the sb.
263 cifs_sb->root = NULL;
265 tcon = cifs_sb_master_tcon(cifs_sb);
268 mutex_lock(&cfid->fid_mutex);
274 mutex_unlock(&cfid->fid_mutex);
278 cifs_umount(cifs_sb);
282 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
284 struct super_block *sb = dentry->d_sb;
285 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
286 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
287 struct TCP_Server_Info *server = tcon->ses->server;
293 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
295 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
297 buf->f_namelen = PATH_MAX;
299 buf->f_fsid.val[0] = tcon->vol_serial_number;
300 /* are using part of create time for more randomness, see man statfs */
301 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
303 buf->f_files = 0; /* undefined */
304 buf->f_ffree = 0; /* unlimited */
306 if (server->ops->queryfs)
307 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
313 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
315 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
316 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
317 struct TCP_Server_Info *server = tcon->ses->server;
319 if (server->ops->fallocate)
320 return server->ops->fallocate(file, tcon, mode, off, len);
325 static int cifs_permission(struct user_namespace *mnt_userns,
326 struct inode *inode, int mask)
328 struct cifs_sb_info *cifs_sb;
330 cifs_sb = CIFS_SB(inode->i_sb);
332 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
333 if ((mask & MAY_EXEC) && !execute_ok(inode))
337 } else /* file mode might have been restricted at mount time
338 on the client (above and beyond ACL on servers) for
339 servers which do not support setting and viewing mode bits,
340 so allowing client to check permissions is useful */
341 return generic_permission(&init_user_ns, inode, mask);
344 static struct kmem_cache *cifs_inode_cachep;
345 static struct kmem_cache *cifs_req_cachep;
346 static struct kmem_cache *cifs_mid_cachep;
347 static struct kmem_cache *cifs_sm_req_cachep;
348 mempool_t *cifs_sm_req_poolp;
349 mempool_t *cifs_req_poolp;
350 mempool_t *cifs_mid_poolp;
352 static struct inode *
353 cifs_alloc_inode(struct super_block *sb)
355 struct cifsInodeInfo *cifs_inode;
356 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
359 cifs_inode->cifsAttrs = 0x20; /* default */
360 cifs_inode->time = 0;
362 * Until the file is open and we have gotten oplock info back from the
363 * server, can not assume caching of file data or metadata.
365 cifs_set_oplock_level(cifs_inode, 0);
366 cifs_inode->flags = 0;
367 spin_lock_init(&cifs_inode->writers_lock);
368 cifs_inode->writers = 0;
369 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
370 cifs_inode->server_eof = 0;
371 cifs_inode->uniqueid = 0;
372 cifs_inode->createtime = 0;
373 cifs_inode->epoch = 0;
374 spin_lock_init(&cifs_inode->open_file_lock);
375 generate_random_uuid(cifs_inode->lease_key);
378 * Can not set i_flags here - they get immediately overwritten to zero
381 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
382 INIT_LIST_HEAD(&cifs_inode->openFileList);
383 INIT_LIST_HEAD(&cifs_inode->llist);
384 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
385 spin_lock_init(&cifs_inode->deferred_lock);
386 return &cifs_inode->vfs_inode;
390 cifs_free_inode(struct inode *inode)
392 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
396 cifs_evict_inode(struct inode *inode)
398 truncate_inode_pages_final(&inode->i_data);
403 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
405 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
406 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
408 seq_puts(s, ",addr=");
410 switch (server->dstaddr.ss_family) {
412 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
415 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
416 if (sa6->sin6_scope_id)
417 seq_printf(s, "%%%u", sa6->sin6_scope_id);
420 seq_puts(s, "(unknown)");
423 seq_puts(s, ",rdma");
427 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
429 if (ses->sectype == Unspecified) {
430 if (ses->user_name == NULL)
431 seq_puts(s, ",sec=none");
435 seq_puts(s, ",sec=");
437 switch (ses->sectype) {
439 seq_puts(s, "ntlmv2");
445 seq_puts(s, "ntlmssp");
448 /* shouldn't ever happen */
449 seq_puts(s, "unknown");
456 if (ses->sectype == Kerberos)
457 seq_printf(s, ",cruid=%u",
458 from_kuid_munged(&init_user_ns, ses->cred_uid));
462 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
464 seq_puts(s, ",cache=");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
467 seq_puts(s, "strict");
468 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
470 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
471 seq_puts(s, "singleclient"); /* assume only one client access */
472 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
473 seq_puts(s, "ro"); /* read only caching assumed */
475 seq_puts(s, "loose");
479 * cifs_show_devname() is used so we show the mount device name with correct
480 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
482 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
484 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
485 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
490 convert_delimiter(devname, '/');
491 /* escape all spaces in share names */
492 seq_escape(m, devname, " \t");
499 * cifs_show_options() is for displaying mount options in /proc/mounts.
500 * Not all settable options are displayed but most of the important
504 cifs_show_options(struct seq_file *s, struct dentry *root)
506 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
507 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
508 struct sockaddr *srcaddr;
509 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
511 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
512 cifs_show_security(s, tcon->ses);
513 cifs_show_cache_flavor(s, cifs_sb);
516 seq_puts(s, ",nolease");
517 if (cifs_sb->ctx->multiuser)
518 seq_puts(s, ",multiuser");
519 else if (tcon->ses->user_name)
520 seq_show_option(s, "username", tcon->ses->user_name);
522 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
523 seq_show_option(s, "domain", tcon->ses->domainName);
525 if (srcaddr->sa_family != AF_UNSPEC) {
526 struct sockaddr_in *saddr4;
527 struct sockaddr_in6 *saddr6;
528 saddr4 = (struct sockaddr_in *)srcaddr;
529 saddr6 = (struct sockaddr_in6 *)srcaddr;
530 if (srcaddr->sa_family == AF_INET6)
531 seq_printf(s, ",srcaddr=%pI6c",
533 else if (srcaddr->sa_family == AF_INET)
534 seq_printf(s, ",srcaddr=%pI4",
535 &saddr4->sin_addr.s_addr);
537 seq_printf(s, ",srcaddr=BAD-AF:%i",
538 (int)(srcaddr->sa_family));
541 seq_printf(s, ",uid=%u",
542 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
543 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
544 seq_puts(s, ",forceuid");
546 seq_puts(s, ",noforceuid");
548 seq_printf(s, ",gid=%u",
549 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
550 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
551 seq_puts(s, ",forcegid");
553 seq_puts(s, ",noforcegid");
555 cifs_show_address(s, tcon->ses->server);
558 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
559 cifs_sb->ctx->file_mode,
560 cifs_sb->ctx->dir_mode);
561 if (cifs_sb->ctx->iocharset)
562 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
564 seq_puts(s, ",seal");
565 else if (tcon->ses->server->ignore_signature)
566 seq_puts(s, ",signloosely");
568 seq_puts(s, ",nocase");
570 seq_puts(s, ",nodelete");
571 if (tcon->local_lease)
572 seq_puts(s, ",locallease");
574 seq_puts(s, ",hard");
576 seq_puts(s, ",soft");
577 if (tcon->use_persistent)
578 seq_puts(s, ",persistenthandles");
579 else if (tcon->use_resilient)
580 seq_puts(s, ",resilienthandles");
581 if (tcon->posix_extensions)
582 seq_puts(s, ",posix");
583 else if (tcon->unix_ext)
584 seq_puts(s, ",unix");
586 seq_puts(s, ",nounix");
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
588 seq_puts(s, ",nodfs");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
590 seq_puts(s, ",posixpaths");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
592 seq_puts(s, ",setuids");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
594 seq_puts(s, ",idsfromsid");
595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
596 seq_puts(s, ",serverino");
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
598 seq_puts(s, ",rwpidforward");
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
600 seq_puts(s, ",forcemand");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
602 seq_puts(s, ",nouser_xattr");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
604 seq_puts(s, ",mapchars");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
606 seq_puts(s, ",mapposix");
607 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
610 seq_puts(s, ",nobrl");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
612 seq_puts(s, ",nohandlecache");
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
614 seq_puts(s, ",modefromsid");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
616 seq_puts(s, ",cifsacl");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
618 seq_puts(s, ",dynperm");
619 if (root->d_sb->s_flags & SB_POSIXACL)
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
622 seq_puts(s, ",mfsymlinks");
623 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
626 seq_puts(s, ",nostrictsync");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
628 seq_puts(s, ",noperm");
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
630 seq_printf(s, ",backupuid=%u",
631 from_kuid_munged(&init_user_ns,
632 cifs_sb->ctx->backupuid));
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
634 seq_printf(s, ",backupgid=%u",
635 from_kgid_munged(&init_user_ns,
636 cifs_sb->ctx->backupgid));
638 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
639 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
640 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
641 if (cifs_sb->ctx->rasize)
642 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
643 if (tcon->ses->server->min_offload)
644 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
645 seq_printf(s, ",echo_interval=%lu",
646 tcon->ses->server->echo_interval / HZ);
648 /* Only display max_credits if it was overridden on mount */
649 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
650 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
652 if (tcon->snapshot_time)
653 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
654 if (tcon->handle_timeout)
655 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
658 * Display file and directory attribute timeout in seconds.
659 * If file and directory attribute timeout the same then actimeo
660 * was likely specified on mount
662 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
663 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
665 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
666 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
669 if (tcon->ses->chan_max > 1)
670 seq_printf(s, ",multichannel,max_channels=%zu",
671 tcon->ses->chan_max);
673 if (tcon->use_witness)
674 seq_puts(s, ",witness");
679 static void cifs_umount_begin(struct super_block *sb)
681 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
682 struct cifs_tcon *tcon;
687 tcon = cifs_sb_master_tcon(cifs_sb);
689 spin_lock(&cifs_tcp_ses_lock);
690 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
691 /* we have other mounts to same share or we have
692 already tried to force umount this and woken up
693 all waiting network requests, nothing to do */
694 spin_unlock(&cifs_tcp_ses_lock);
696 } else if (tcon->tc_count == 1)
697 tcon->tidStatus = CifsExiting;
698 spin_unlock(&cifs_tcp_ses_lock);
700 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
701 /* cancel_notify_requests(tcon); */
702 if (tcon->ses && tcon->ses->server) {
703 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
704 wake_up_all(&tcon->ses->server->request_q);
705 wake_up_all(&tcon->ses->server->response_q);
706 msleep(1); /* yield */
707 /* we have to kick the requests once more */
708 wake_up_all(&tcon->ses->server->response_q);
715 #ifdef CONFIG_CIFS_STATS2
716 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
723 static int cifs_drop_inode(struct inode *inode)
725 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
727 /* no serverino => unconditional eviction */
728 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
729 generic_drop_inode(inode);
732 static const struct super_operations cifs_super_ops = {
733 .statfs = cifs_statfs,
734 .alloc_inode = cifs_alloc_inode,
735 .free_inode = cifs_free_inode,
736 .drop_inode = cifs_drop_inode,
737 .evict_inode = cifs_evict_inode,
738 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
739 .show_devname = cifs_show_devname,
740 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
741 function unless later we add lazy close of inodes or unless the
742 kernel forgets to call us with the same number of releases (closes)
744 .show_options = cifs_show_options,
745 .umount_begin = cifs_umount_begin,
746 #ifdef CONFIG_CIFS_STATS2
747 .show_stats = cifs_show_stats,
752 * Get root dentry from superblock according to prefix path mount option.
753 * Return dentry with refcount + 1 on success and NULL otherwise.
755 static struct dentry *
756 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
758 struct dentry *dentry;
759 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
760 char *full_path = NULL;
764 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
765 return dget(sb->s_root);
767 full_path = cifs_build_path_to_root(ctx, cifs_sb,
768 cifs_sb_master_tcon(cifs_sb), 0);
769 if (full_path == NULL)
770 return ERR_PTR(-ENOMEM);
772 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
774 sep = CIFS_DIR_SEP(cifs_sb);
775 dentry = dget(sb->s_root);
779 struct inode *dir = d_inode(dentry);
780 struct dentry *child;
782 if (!S_ISDIR(dir->i_mode)) {
784 dentry = ERR_PTR(-ENOTDIR);
788 /* skip separators */
795 while (*s && *s != sep)
798 child = lookup_positive_unlocked(p, dentry, s - p);
801 } while (!IS_ERR(dentry));
806 static int cifs_set_super(struct super_block *sb, void *data)
808 struct cifs_mnt_data *mnt_data = data;
809 sb->s_fs_info = mnt_data->cifs_sb;
810 return set_anon_super(sb, NULL);
814 cifs_smb3_do_mount(struct file_system_type *fs_type,
815 int flags, struct smb3_fs_context *old_ctx)
818 struct super_block *sb;
819 struct cifs_sb_info *cifs_sb = NULL;
820 struct cifs_mnt_data mnt_data;
824 * Prints in Kernel / CIFS log the attempted mount operation
825 * If CIFS_DEBUG && cifs_FYI
828 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
830 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
832 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
833 if (cifs_sb == NULL) {
834 root = ERR_PTR(-ENOMEM);
838 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
840 root = ERR_PTR(-ENOMEM);
843 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
849 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
855 rc = cifs_setup_cifs_sb(cifs_sb);
861 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
863 if (!(flags & SB_SILENT))
864 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
870 mnt_data.ctx = cifs_sb->ctx;
871 mnt_data.cifs_sb = cifs_sb;
872 mnt_data.flags = flags;
874 /* BB should we make this contingent on mount parm? */
875 flags |= SB_NODIRATIME | SB_NOATIME;
877 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
880 cifs_umount(cifs_sb);
886 cifs_dbg(FYI, "Use existing superblock\n");
887 cifs_umount(cifs_sb);
890 rc = cifs_read_super(sb);
896 sb->s_flags |= SB_ACTIVE;
899 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
904 cifs_sb->root = dget(root);
906 cifs_dbg(FYI, "dentry root is: %p\n", root);
910 deactivate_locked_super(sb);
913 kfree(cifs_sb->prepath);
914 smb3_cleanup_fs_context(cifs_sb->ctx);
922 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
925 struct inode *inode = file_inode(iocb->ki_filp);
927 if (iocb->ki_filp->f_flags & O_DIRECT)
928 return cifs_user_readv(iocb, iter);
930 rc = cifs_revalidate_mapping(inode);
934 return generic_file_read_iter(iocb, iter);
937 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
939 struct inode *inode = file_inode(iocb->ki_filp);
940 struct cifsInodeInfo *cinode = CIFS_I(inode);
944 if (iocb->ki_filp->f_flags & O_DIRECT) {
945 written = cifs_user_writev(iocb, from);
946 if (written > 0 && CIFS_CACHE_READ(cinode)) {
947 cifs_zap_mapping(inode);
949 "Set no oplock for inode=%p after a write operation\n",
956 written = cifs_get_writer(cinode);
960 written = generic_file_write_iter(iocb, from);
962 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
965 rc = filemap_fdatawrite(inode->i_mapping);
967 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
971 cifs_put_writer(cinode);
975 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
977 struct cifsFileInfo *cfile = file->private_data;
978 struct cifs_tcon *tcon;
981 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
982 * the cached file length
984 if (whence != SEEK_SET && whence != SEEK_CUR) {
986 struct inode *inode = file_inode(file);
989 * We need to be sure that all dirty pages are written and the
990 * server has the newest file length.
992 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
993 inode->i_mapping->nrpages != 0) {
994 rc = filemap_fdatawait(inode->i_mapping);
996 mapping_set_error(inode->i_mapping, rc);
1001 * Some applications poll for the file length in this strange
1002 * way so we must seek to end on non-oplocked files by
1003 * setting the revalidate time to zero.
1005 CIFS_I(inode)->time = 0;
1007 rc = cifs_revalidate_file_attr(file);
1011 if (cfile && cfile->tlink) {
1012 tcon = tlink_tcon(cfile->tlink);
1013 if (tcon->ses->server->ops->llseek)
1014 return tcon->ses->server->ops->llseek(file, tcon,
1017 return generic_file_llseek(file, offset, whence);
1021 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1024 * Note that this is called by vfs setlease with i_lock held to
1025 * protect *lease from going away.
1027 struct inode *inode = file_inode(file);
1028 struct cifsFileInfo *cfile = file->private_data;
1030 if (!(S_ISREG(inode->i_mode)))
1033 /* Check if file is oplocked if this is request for new lease */
1034 if (arg == F_UNLCK ||
1035 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1036 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1037 return generic_setlease(file, arg, lease, priv);
1038 else if (tlink_tcon(cfile->tlink)->local_lease &&
1039 !CIFS_CACHE_READ(CIFS_I(inode)))
1041 * If the server claims to support oplock on this file, then we
1042 * still need to check oplock even if the local_lease mount
1043 * option is set, but there are servers which do not support
1044 * oplock for which this mount option may be useful if the user
1045 * knows that the file won't be changed on the server by anyone
1048 return generic_setlease(file, arg, lease, priv);
1053 struct file_system_type cifs_fs_type = {
1054 .owner = THIS_MODULE,
1056 .init_fs_context = smb3_init_fs_context,
1057 .parameters = smb3_fs_parameters,
1058 .kill_sb = cifs_kill_sb,
1059 .fs_flags = FS_RENAME_DOES_D_MOVE,
1061 MODULE_ALIAS_FS("cifs");
1063 static struct file_system_type smb3_fs_type = {
1064 .owner = THIS_MODULE,
1066 .init_fs_context = smb3_init_fs_context,
1067 .parameters = smb3_fs_parameters,
1068 .kill_sb = cifs_kill_sb,
1069 .fs_flags = FS_RENAME_DOES_D_MOVE,
1071 MODULE_ALIAS_FS("smb3");
1072 MODULE_ALIAS("smb3");
1074 const struct inode_operations cifs_dir_inode_ops = {
1075 .create = cifs_create,
1076 .atomic_open = cifs_atomic_open,
1077 .lookup = cifs_lookup,
1078 .getattr = cifs_getattr,
1079 .unlink = cifs_unlink,
1080 .link = cifs_hardlink,
1081 .mkdir = cifs_mkdir,
1082 .rmdir = cifs_rmdir,
1083 .rename = cifs_rename2,
1084 .permission = cifs_permission,
1085 .setattr = cifs_setattr,
1086 .symlink = cifs_symlink,
1087 .mknod = cifs_mknod,
1088 .listxattr = cifs_listxattr,
1091 const struct inode_operations cifs_file_inode_ops = {
1092 .setattr = cifs_setattr,
1093 .getattr = cifs_getattr,
1094 .permission = cifs_permission,
1095 .listxattr = cifs_listxattr,
1096 .fiemap = cifs_fiemap,
1099 const struct inode_operations cifs_symlink_inode_ops = {
1100 .get_link = cifs_get_link,
1101 .permission = cifs_permission,
1102 .listxattr = cifs_listxattr,
1105 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1106 struct file *dst_file, loff_t destoff, loff_t len,
1107 unsigned int remap_flags)
1109 struct inode *src_inode = file_inode(src_file);
1110 struct inode *target_inode = file_inode(dst_file);
1111 struct cifsFileInfo *smb_file_src = src_file->private_data;
1112 struct cifsFileInfo *smb_file_target;
1113 struct cifs_tcon *target_tcon;
1117 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1120 cifs_dbg(FYI, "clone range\n");
1124 if (!src_file->private_data || !dst_file->private_data) {
1126 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1130 smb_file_target = dst_file->private_data;
1131 target_tcon = tlink_tcon(smb_file_target->tlink);
1134 * Note: cifs case is easier than btrfs since server responsible for
1135 * checks for proper open modes and file type and if it wants
1136 * server could even support copy of range where source = target
1138 lock_two_nondirectories(target_inode, src_inode);
1141 len = src_inode->i_size - off;
1143 cifs_dbg(FYI, "about to flush pages\n");
1144 /* should we flush first and last page first */
1145 truncate_inode_pages_range(&target_inode->i_data, destoff,
1146 PAGE_ALIGN(destoff + len)-1);
1148 if (target_tcon->ses->server->ops->duplicate_extents)
1149 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1150 smb_file_src, smb_file_target, off, len, destoff);
1154 /* force revalidate of size and timestamps of target file now
1155 that target is updated on the server */
1156 CIFS_I(target_inode)->time = 0;
1157 /* although unlocking in the reverse order from locking is not
1158 strictly necessary here it is a little cleaner to be consistent */
1159 unlock_two_nondirectories(src_inode, target_inode);
1162 return rc < 0 ? rc : len;
1165 ssize_t cifs_file_copychunk_range(unsigned int xid,
1166 struct file *src_file, loff_t off,
1167 struct file *dst_file, loff_t destoff,
1168 size_t len, unsigned int flags)
1170 struct inode *src_inode = file_inode(src_file);
1171 struct inode *target_inode = file_inode(dst_file);
1172 struct cifsFileInfo *smb_file_src;
1173 struct cifsFileInfo *smb_file_target;
1174 struct cifs_tcon *src_tcon;
1175 struct cifs_tcon *target_tcon;
1178 cifs_dbg(FYI, "copychunk range\n");
1180 if (!src_file->private_data || !dst_file->private_data) {
1182 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1187 smb_file_target = dst_file->private_data;
1188 smb_file_src = src_file->private_data;
1189 src_tcon = tlink_tcon(smb_file_src->tlink);
1190 target_tcon = tlink_tcon(smb_file_target->tlink);
1192 if (src_tcon->ses != target_tcon->ses) {
1193 cifs_dbg(VFS, "source and target of copy not on same server\n");
1198 if (!target_tcon->ses->server->ops->copychunk_range)
1202 * Note: cifs case is easier than btrfs since server responsible for
1203 * checks for proper open modes and file type and if it wants
1204 * server could even support copy of range where source = target
1206 lock_two_nondirectories(target_inode, src_inode);
1208 cifs_dbg(FYI, "about to flush pages\n");
1209 /* should we flush first and last page first */
1210 truncate_inode_pages(&target_inode->i_data, 0);
1212 rc = file_modified(dst_file);
1214 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1215 smb_file_src, smb_file_target, off, len, destoff);
1217 file_accessed(src_file);
1219 /* force revalidate of size and timestamps of target file now
1220 * that target is updated on the server
1222 CIFS_I(target_inode)->time = 0;
1223 /* although unlocking in the reverse order from locking is not
1224 * strictly necessary here it is a little cleaner to be consistent
1226 unlock_two_nondirectories(src_inode, target_inode);
1233 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1234 * is a dummy operation.
1236 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1238 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1244 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1245 struct file *dst_file, loff_t destoff,
1246 size_t len, unsigned int flags)
1248 unsigned int xid = get_xid();
1250 struct cifsFileInfo *cfile = dst_file->private_data;
1252 if (cfile->swapfile)
1255 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1259 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1260 rc = generic_copy_file_range(src_file, off, dst_file,
1261 destoff, len, flags);
1265 const struct file_operations cifs_file_ops = {
1266 .read_iter = cifs_loose_read_iter,
1267 .write_iter = cifs_file_write_iter,
1269 .release = cifs_close,
1271 .flock = cifs_flock,
1272 .fsync = cifs_fsync,
1273 .flush = cifs_flush,
1274 .mmap = cifs_file_mmap,
1275 .splice_read = generic_file_splice_read,
1276 .splice_write = iter_file_splice_write,
1277 .llseek = cifs_llseek,
1278 .unlocked_ioctl = cifs_ioctl,
1279 .copy_file_range = cifs_copy_file_range,
1280 .remap_file_range = cifs_remap_file_range,
1281 .setlease = cifs_setlease,
1282 .fallocate = cifs_fallocate,
1285 const struct file_operations cifs_file_strict_ops = {
1286 .read_iter = cifs_strict_readv,
1287 .write_iter = cifs_strict_writev,
1289 .release = cifs_close,
1291 .flock = cifs_flock,
1292 .fsync = cifs_strict_fsync,
1293 .flush = cifs_flush,
1294 .mmap = cifs_file_strict_mmap,
1295 .splice_read = generic_file_splice_read,
1296 .splice_write = iter_file_splice_write,
1297 .llseek = cifs_llseek,
1298 .unlocked_ioctl = cifs_ioctl,
1299 .copy_file_range = cifs_copy_file_range,
1300 .remap_file_range = cifs_remap_file_range,
1301 .setlease = cifs_setlease,
1302 .fallocate = cifs_fallocate,
1305 const struct file_operations cifs_file_direct_ops = {
1306 .read_iter = cifs_direct_readv,
1307 .write_iter = cifs_direct_writev,
1309 .release = cifs_close,
1311 .flock = cifs_flock,
1312 .fsync = cifs_fsync,
1313 .flush = cifs_flush,
1314 .mmap = cifs_file_mmap,
1315 .splice_read = generic_file_splice_read,
1316 .splice_write = iter_file_splice_write,
1317 .unlocked_ioctl = cifs_ioctl,
1318 .copy_file_range = cifs_copy_file_range,
1319 .remap_file_range = cifs_remap_file_range,
1320 .llseek = cifs_llseek,
1321 .setlease = cifs_setlease,
1322 .fallocate = cifs_fallocate,
1325 const struct file_operations cifs_file_nobrl_ops = {
1326 .read_iter = cifs_loose_read_iter,
1327 .write_iter = cifs_file_write_iter,
1329 .release = cifs_close,
1330 .fsync = cifs_fsync,
1331 .flush = cifs_flush,
1332 .mmap = cifs_file_mmap,
1333 .splice_read = generic_file_splice_read,
1334 .splice_write = iter_file_splice_write,
1335 .llseek = cifs_llseek,
1336 .unlocked_ioctl = cifs_ioctl,
1337 .copy_file_range = cifs_copy_file_range,
1338 .remap_file_range = cifs_remap_file_range,
1339 .setlease = cifs_setlease,
1340 .fallocate = cifs_fallocate,
1343 const struct file_operations cifs_file_strict_nobrl_ops = {
1344 .read_iter = cifs_strict_readv,
1345 .write_iter = cifs_strict_writev,
1347 .release = cifs_close,
1348 .fsync = cifs_strict_fsync,
1349 .flush = cifs_flush,
1350 .mmap = cifs_file_strict_mmap,
1351 .splice_read = generic_file_splice_read,
1352 .splice_write = iter_file_splice_write,
1353 .llseek = cifs_llseek,
1354 .unlocked_ioctl = cifs_ioctl,
1355 .copy_file_range = cifs_copy_file_range,
1356 .remap_file_range = cifs_remap_file_range,
1357 .setlease = cifs_setlease,
1358 .fallocate = cifs_fallocate,
1361 const struct file_operations cifs_file_direct_nobrl_ops = {
1362 .read_iter = cifs_direct_readv,
1363 .write_iter = cifs_direct_writev,
1365 .release = cifs_close,
1366 .fsync = cifs_fsync,
1367 .flush = cifs_flush,
1368 .mmap = cifs_file_mmap,
1369 .splice_read = generic_file_splice_read,
1370 .splice_write = iter_file_splice_write,
1371 .unlocked_ioctl = cifs_ioctl,
1372 .copy_file_range = cifs_copy_file_range,
1373 .remap_file_range = cifs_remap_file_range,
1374 .llseek = cifs_llseek,
1375 .setlease = cifs_setlease,
1376 .fallocate = cifs_fallocate,
1379 const struct file_operations cifs_dir_ops = {
1380 .iterate_shared = cifs_readdir,
1381 .release = cifs_closedir,
1382 .read = generic_read_dir,
1383 .unlocked_ioctl = cifs_ioctl,
1384 .copy_file_range = cifs_copy_file_range,
1385 .remap_file_range = cifs_remap_file_range,
1386 .llseek = generic_file_llseek,
1387 .fsync = cifs_dir_fsync,
1391 cifs_init_once(void *inode)
1393 struct cifsInodeInfo *cifsi = inode;
1395 inode_init_once(&cifsi->vfs_inode);
1396 init_rwsem(&cifsi->lock_sem);
1400 cifs_init_inodecache(void)
1402 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1403 sizeof(struct cifsInodeInfo),
1404 0, (SLAB_RECLAIM_ACCOUNT|
1405 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1407 if (cifs_inode_cachep == NULL)
1414 cifs_destroy_inodecache(void)
1417 * Make sure all delayed rcu free inodes are flushed before we
1421 kmem_cache_destroy(cifs_inode_cachep);
1425 cifs_init_request_bufs(void)
1428 * SMB2 maximum header size is bigger than CIFS one - no problems to
1429 * allocate some more bytes for CIFS.
1431 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1433 if (CIFSMaxBufSize < 8192) {
1434 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1435 Unicode path name has to fit in any SMB/CIFS path based frames */
1436 CIFSMaxBufSize = 8192;
1437 } else if (CIFSMaxBufSize > 1024*127) {
1438 CIFSMaxBufSize = 1024 * 127;
1440 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1443 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1444 CIFSMaxBufSize, CIFSMaxBufSize);
1446 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1447 CIFSMaxBufSize + max_hdr_size, 0,
1448 SLAB_HWCACHE_ALIGN, 0,
1449 CIFSMaxBufSize + max_hdr_size,
1451 if (cifs_req_cachep == NULL)
1454 if (cifs_min_rcv < 1)
1456 else if (cifs_min_rcv > 64) {
1458 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1461 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1464 if (cifs_req_poolp == NULL) {
1465 kmem_cache_destroy(cifs_req_cachep);
1468 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1469 almost all handle based requests (but not write response, nor is it
1470 sufficient for path based requests). A smaller size would have
1471 been more efficient (compacting multiple slab items on one 4k page)
1472 for the case in which debug was on, but this larger size allows
1473 more SMBs to use small buffer alloc and is still much more
1474 efficient to alloc 1 per page off the slab compared to 17K (5page)
1475 alloc of large cifs buffers even when page debugging is on */
1476 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1477 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1478 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1479 if (cifs_sm_req_cachep == NULL) {
1480 mempool_destroy(cifs_req_poolp);
1481 kmem_cache_destroy(cifs_req_cachep);
1485 if (cifs_min_small < 2)
1487 else if (cifs_min_small > 256) {
1488 cifs_min_small = 256;
1489 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1492 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1493 cifs_sm_req_cachep);
1495 if (cifs_sm_req_poolp == NULL) {
1496 mempool_destroy(cifs_req_poolp);
1497 kmem_cache_destroy(cifs_req_cachep);
1498 kmem_cache_destroy(cifs_sm_req_cachep);
1506 cifs_destroy_request_bufs(void)
1508 mempool_destroy(cifs_req_poolp);
1509 kmem_cache_destroy(cifs_req_cachep);
1510 mempool_destroy(cifs_sm_req_poolp);
1511 kmem_cache_destroy(cifs_sm_req_cachep);
1515 cifs_init_mids(void)
1517 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1518 sizeof(struct mid_q_entry), 0,
1519 SLAB_HWCACHE_ALIGN, NULL);
1520 if (cifs_mid_cachep == NULL)
1523 /* 3 is a reasonable minimum number of simultaneous operations */
1524 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1525 if (cifs_mid_poolp == NULL) {
1526 kmem_cache_destroy(cifs_mid_cachep);
1534 cifs_destroy_mids(void)
1536 mempool_destroy(cifs_mid_poolp);
1537 kmem_cache_destroy(cifs_mid_cachep);
1545 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1547 * Initialize Global counters
1549 atomic_set(&sesInfoAllocCount, 0);
1550 atomic_set(&tconInfoAllocCount, 0);
1551 atomic_set(&tcpSesNextId, 0);
1552 atomic_set(&tcpSesAllocCount, 0);
1553 atomic_set(&tcpSesReconnectCount, 0);
1554 atomic_set(&tconInfoReconnectCount, 0);
1556 atomic_set(&bufAllocCount, 0);
1557 atomic_set(&smBufAllocCount, 0);
1558 #ifdef CONFIG_CIFS_STATS2
1559 atomic_set(&totBufAllocCount, 0);
1560 atomic_set(&totSmBufAllocCount, 0);
1561 if (slow_rsp_threshold < 1)
1562 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1563 else if (slow_rsp_threshold > 32767)
1565 "slow response threshold set higher than recommended (0 to 32767)\n");
1566 #endif /* CONFIG_CIFS_STATS2 */
1568 atomic_set(&midCount, 0);
1569 GlobalCurrentXid = 0;
1570 GlobalTotalActiveXid = 0;
1571 GlobalMaxActiveXid = 0;
1572 spin_lock_init(&cifs_tcp_ses_lock);
1573 spin_lock_init(&GlobalMid_Lock);
1575 cifs_lock_secret = get_random_u32();
1577 if (cifs_max_pending < 2) {
1578 cifs_max_pending = 2;
1579 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1580 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1581 cifs_max_pending = CIFS_MAX_REQ;
1582 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1586 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1589 goto out_clean_proc;
1593 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1594 * so that we don't launch too many worker threads but
1595 * Documentation/core-api/workqueue.rst recommends setting it to 0
1598 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1599 decrypt_wq = alloc_workqueue("smb3decryptd",
1600 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1603 goto out_destroy_cifsiod_wq;
1606 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1607 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1608 if (!fileinfo_put_wq) {
1610 goto out_destroy_decrypt_wq;
1613 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1614 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1615 if (!cifsoplockd_wq) {
1617 goto out_destroy_fileinfo_put_wq;
1620 deferredclose_wq = alloc_workqueue("deferredclose",
1621 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1622 if (!deferredclose_wq) {
1624 goto out_destroy_cifsoplockd_wq;
1627 rc = cifs_fscache_register();
1629 goto out_destroy_deferredclose_wq;
1631 rc = cifs_init_inodecache();
1633 goto out_unreg_fscache;
1635 rc = cifs_init_mids();
1637 goto out_destroy_inodecache;
1639 rc = cifs_init_request_bufs();
1641 goto out_destroy_mids;
1643 #ifdef CONFIG_CIFS_DFS_UPCALL
1644 rc = dfs_cache_init();
1646 goto out_destroy_request_bufs;
1647 #endif /* CONFIG_CIFS_DFS_UPCALL */
1648 #ifdef CONFIG_CIFS_UPCALL
1649 rc = init_cifs_spnego();
1651 goto out_destroy_dfs_cache;
1652 #endif /* CONFIG_CIFS_UPCALL */
1653 #ifdef CONFIG_CIFS_SWN_UPCALL
1654 rc = cifs_genl_init();
1656 goto out_register_key_type;
1657 #endif /* CONFIG_CIFS_SWN_UPCALL */
1659 rc = init_cifs_idmap();
1661 goto out_cifs_swn_init;
1663 rc = register_filesystem(&cifs_fs_type);
1665 goto out_init_cifs_idmap;
1667 rc = register_filesystem(&smb3_fs_type);
1669 unregister_filesystem(&cifs_fs_type);
1670 goto out_init_cifs_idmap;
1675 out_init_cifs_idmap:
1678 #ifdef CONFIG_CIFS_SWN_UPCALL
1680 out_register_key_type:
1682 #ifdef CONFIG_CIFS_UPCALL
1684 out_destroy_dfs_cache:
1686 #ifdef CONFIG_CIFS_DFS_UPCALL
1687 dfs_cache_destroy();
1688 out_destroy_request_bufs:
1690 cifs_destroy_request_bufs();
1692 cifs_destroy_mids();
1693 out_destroy_inodecache:
1694 cifs_destroy_inodecache();
1696 cifs_fscache_unregister();
1697 out_destroy_deferredclose_wq:
1698 destroy_workqueue(deferredclose_wq);
1699 out_destroy_cifsoplockd_wq:
1700 destroy_workqueue(cifsoplockd_wq);
1701 out_destroy_fileinfo_put_wq:
1702 destroy_workqueue(fileinfo_put_wq);
1703 out_destroy_decrypt_wq:
1704 destroy_workqueue(decrypt_wq);
1705 out_destroy_cifsiod_wq:
1706 destroy_workqueue(cifsiod_wq);
1715 cifs_dbg(NOISY, "exit_smb3\n");
1716 unregister_filesystem(&cifs_fs_type);
1717 unregister_filesystem(&smb3_fs_type);
1718 cifs_dfs_release_automount_timer();
1720 #ifdef CONFIG_CIFS_SWN_UPCALL
1723 #ifdef CONFIG_CIFS_UPCALL
1726 #ifdef CONFIG_CIFS_DFS_UPCALL
1727 dfs_cache_destroy();
1729 cifs_destroy_request_bufs();
1730 cifs_destroy_mids();
1731 cifs_destroy_inodecache();
1732 cifs_fscache_unregister();
1733 destroy_workqueue(deferredclose_wq);
1734 destroy_workqueue(cifsoplockd_wq);
1735 destroy_workqueue(decrypt_wq);
1736 destroy_workqueue(fileinfo_put_wq);
1737 destroy_workqueue(cifsiod_wq);
1741 MODULE_AUTHOR("Steve French");
1742 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1744 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1745 "also older servers complying with the SNIA CIFS Specification)");
1746 MODULE_VERSION(CIFS_VERSION);
1747 MODULE_SOFTDEP("ecb");
1748 MODULE_SOFTDEP("hmac");
1749 MODULE_SOFTDEP("md5");
1750 MODULE_SOFTDEP("nls");
1751 MODULE_SOFTDEP("aes");
1752 MODULE_SOFTDEP("cmac");
1753 MODULE_SOFTDEP("sha256");
1754 MODULE_SOFTDEP("sha512");
1755 MODULE_SOFTDEP("aead2");
1756 MODULE_SOFTDEP("ccm");
1757 MODULE_SOFTDEP("gcm");
1758 module_init(init_cifs)
1759 module_exit(exit_cifs)