1 // SPDX-License-Identifier: LGPL-2.1
5 * Copyright (C) International Business Machines Corp., 2002,2008
6 * Author(s): Steve French (sfrench@us.ibm.com)
8 * Common Internet FileSystem (CIFS) client
12 /* Note that BB means BUGBUG (ie something to fix eventually) */
14 #include <linux/module.h>
16 #include <linux/mount.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/list.h>
20 #include <linux/seq_file.h>
21 #include <linux/vfs.h>
22 #include <linux/mempool.h>
23 #include <linux/delay.h>
24 #include <linux/kthread.h>
25 #include <linux/freezer.h>
26 #include <linux/namei.h>
27 #include <linux/random.h>
28 #include <linux/uuid.h>
29 #include <linux/xattr.h>
33 #define DECLARE_GLOBALS_HERE
35 #include "cifsproto.h"
36 #include "cifs_debug.h"
37 #include "cifs_fs_sb.h"
39 #include <linux/key-type.h>
40 #include "cifs_spnego.h"
43 #ifdef CONFIG_CIFS_DFS_UPCALL
44 #include "dfs_cache.h"
46 #ifdef CONFIG_CIFS_SWN_UPCALL
49 #include "fs_context.h"
52 * DOS dates from 1980/1/1 through 2107/12/31
53 * Protocol specifications indicate the range should be to 119, which
54 * limits maximum year to 2099. But this range has not been checked.
56 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
57 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
58 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
62 bool enable_oplocks = true;
63 bool linuxExtEnabled = true;
64 bool lookupCacheEnabled = true;
65 bool disable_legacy_dialects; /* false by default */
66 bool enable_gcm_256 = true;
67 bool require_gcm_256; /* false by default */
68 bool enable_negotiate_signing; /* false by default */
69 unsigned int global_secflags = CIFSSEC_DEF;
70 /* unsigned int ntlmv2_support = 0; */
71 unsigned int sign_CIFS_PDUs = 1;
72 static const struct super_operations cifs_super_ops;
73 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
74 module_param(CIFSMaxBufSize, uint, 0444);
75 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
77 "Default: 16384 Range: 8192 to 130048");
78 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
79 module_param(cifs_min_rcv, uint, 0444);
80 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
82 unsigned int cifs_min_small = 30;
83 module_param(cifs_min_small, uint, 0444);
84 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
86 unsigned int cifs_max_pending = CIFS_MAX_REQ;
87 module_param(cifs_max_pending, uint, 0444);
88 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
89 "CIFS/SMB1 dialect (N/A for SMB3) "
90 "Default: 32767 Range: 2 to 32767.");
91 #ifdef CONFIG_CIFS_STATS2
92 unsigned int slow_rsp_threshold = 1;
93 module_param(slow_rsp_threshold, uint, 0644);
94 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
95 "before logging that a response is delayed. "
96 "Default: 1 (if set to 0 disables msg).");
99 module_param(enable_oplocks, bool, 0644);
100 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
102 module_param(enable_gcm_256, bool, 0644);
103 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
105 module_param(require_gcm_256, bool, 0644);
106 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
108 module_param(enable_negotiate_signing, bool, 0644);
109 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
111 module_param(disable_legacy_dialects, bool, 0644);
112 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
113 "helpful to restrict the ability to "
114 "override the default dialects (SMB2.1, "
115 "SMB3 and SMB3.02) on mount with old "
116 "dialects (CIFS/SMB1 and SMB2) since "
117 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
118 " and less secure. Default: n/N/0");
120 extern mempool_t *cifs_sm_req_poolp;
121 extern mempool_t *cifs_req_poolp;
122 extern mempool_t *cifs_mid_poolp;
124 struct workqueue_struct *cifsiod_wq;
125 struct workqueue_struct *decrypt_wq;
126 struct workqueue_struct *fileinfo_put_wq;
127 struct workqueue_struct *cifsoplockd_wq;
128 struct workqueue_struct *deferredclose_wq;
129 __u32 cifs_lock_secret;
132 * Bumps refcount for cifs super block.
133 * Note that it should be only called if a referece to VFS super block is
134 * already held, e.g. in open-type syscalls context. Otherwise it can race with
135 * atomic_dec_and_test in deactivate_locked_super.
138 cifs_sb_active(struct super_block *sb)
140 struct cifs_sb_info *server = CIFS_SB(sb);
142 if (atomic_inc_return(&server->active) == 1)
143 atomic_inc(&sb->s_active);
147 cifs_sb_deactive(struct super_block *sb)
149 struct cifs_sb_info *server = CIFS_SB(sb);
151 if (atomic_dec_and_test(&server->active))
152 deactivate_super(sb);
156 cifs_read_super(struct super_block *sb)
159 struct cifs_sb_info *cifs_sb;
160 struct cifs_tcon *tcon;
161 struct timespec64 ts;
164 cifs_sb = CIFS_SB(sb);
165 tcon = cifs_sb_master_tcon(cifs_sb);
167 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
168 sb->s_flags |= SB_POSIXACL;
170 if (tcon->snapshot_time)
171 sb->s_flags |= SB_RDONLY;
173 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
174 sb->s_maxbytes = MAX_LFS_FILESIZE;
176 sb->s_maxbytes = MAX_NON_LFS;
179 * Some very old servers like DOS and OS/2 used 2 second granularity
180 * (while all current servers use 100ns granularity - see MS-DTYP)
181 * but 1 second is the maximum allowed granularity for the VFS
182 * so for old servers set time granularity to 1 second while for
183 * everything else (current servers) set it to 100ns.
185 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
186 ((tcon->ses->capabilities &
187 tcon->ses->server->vals->cap_nt_find) == 0) &&
189 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
190 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
191 sb->s_time_min = ts.tv_sec;
192 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
193 cpu_to_le16(SMB_TIME_MAX), 0);
194 sb->s_time_max = ts.tv_sec;
197 * Almost every server, including all SMB2+, uses DCE TIME
198 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
200 sb->s_time_gran = 100;
201 ts = cifs_NTtimeToUnix(0);
202 sb->s_time_min = ts.tv_sec;
203 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
204 sb->s_time_max = ts.tv_sec;
207 sb->s_magic = CIFS_MAGIC_NUMBER;
208 sb->s_op = &cifs_super_ops;
209 sb->s_xattr = cifs_xattr_handlers;
210 rc = super_setup_bdi(sb);
213 /* tune readahead according to rsize if readahead size not set on mount */
214 if (cifs_sb->ctx->rasize)
215 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
217 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
219 sb->s_blocksize = CIFS_MAX_MSGSIZE;
220 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
221 inode = cifs_root_iget(sb);
229 sb->s_d_op = &cifs_ci_dentry_ops;
231 sb->s_d_op = &cifs_dentry_ops;
233 sb->s_root = d_make_root(inode);
239 #ifdef CONFIG_CIFS_NFSD_EXPORT
240 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
241 cifs_dbg(FYI, "export ops supported\n");
242 sb->s_export_op = &cifs_export_ops;
244 #endif /* CONFIG_CIFS_NFSD_EXPORT */
249 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
253 static void cifs_kill_sb(struct super_block *sb)
255 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
256 struct cifs_tcon *tcon;
257 struct cached_fid *cfid;
260 * We ned to release all dentries for the cached directories
261 * before we kill the sb.
265 cifs_sb->root = NULL;
267 tcon = cifs_sb_master_tcon(cifs_sb);
270 mutex_lock(&cfid->fid_mutex);
276 mutex_unlock(&cfid->fid_mutex);
280 cifs_umount(cifs_sb);
284 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
286 struct super_block *sb = dentry->d_sb;
287 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
288 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
289 struct TCP_Server_Info *server = tcon->ses->server;
295 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
297 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
299 buf->f_namelen = PATH_MAX;
301 buf->f_fsid.val[0] = tcon->vol_serial_number;
302 /* are using part of create time for more randomness, see man statfs */
303 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
305 buf->f_files = 0; /* undefined */
306 buf->f_ffree = 0; /* unlimited */
308 if (server->ops->queryfs)
309 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
315 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
317 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
318 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
319 struct TCP_Server_Info *server = tcon->ses->server;
321 if (server->ops->fallocate)
322 return server->ops->fallocate(file, tcon, mode, off, len);
327 static int cifs_permission(struct user_namespace *mnt_userns,
328 struct inode *inode, int mask)
330 struct cifs_sb_info *cifs_sb;
332 cifs_sb = CIFS_SB(inode->i_sb);
334 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
335 if ((mask & MAY_EXEC) && !execute_ok(inode))
339 } else /* file mode might have been restricted at mount time
340 on the client (above and beyond ACL on servers) for
341 servers which do not support setting and viewing mode bits,
342 so allowing client to check permissions is useful */
343 return generic_permission(&init_user_ns, inode, mask);
346 static struct kmem_cache *cifs_inode_cachep;
347 static struct kmem_cache *cifs_req_cachep;
348 static struct kmem_cache *cifs_mid_cachep;
349 static struct kmem_cache *cifs_sm_req_cachep;
350 mempool_t *cifs_sm_req_poolp;
351 mempool_t *cifs_req_poolp;
352 mempool_t *cifs_mid_poolp;
354 static struct inode *
355 cifs_alloc_inode(struct super_block *sb)
357 struct cifsInodeInfo *cifs_inode;
358 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
361 cifs_inode->cifsAttrs = 0x20; /* default */
362 cifs_inode->time = 0;
364 * Until the file is open and we have gotten oplock info back from the
365 * server, can not assume caching of file data or metadata.
367 cifs_set_oplock_level(cifs_inode, 0);
368 cifs_inode->flags = 0;
369 spin_lock_init(&cifs_inode->writers_lock);
370 cifs_inode->writers = 0;
371 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
372 cifs_inode->server_eof = 0;
373 cifs_inode->uniqueid = 0;
374 cifs_inode->createtime = 0;
375 cifs_inode->epoch = 0;
376 spin_lock_init(&cifs_inode->open_file_lock);
377 generate_random_uuid(cifs_inode->lease_key);
380 * Can not set i_flags here - they get immediately overwritten to zero
383 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
384 INIT_LIST_HEAD(&cifs_inode->openFileList);
385 INIT_LIST_HEAD(&cifs_inode->llist);
386 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
387 spin_lock_init(&cifs_inode->deferred_lock);
388 return &cifs_inode->vfs_inode;
392 cifs_free_inode(struct inode *inode)
394 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
398 cifs_evict_inode(struct inode *inode)
400 truncate_inode_pages_final(&inode->i_data);
402 cifs_fscache_release_inode_cookie(inode);
406 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
408 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
409 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
411 seq_puts(s, ",addr=");
413 switch (server->dstaddr.ss_family) {
415 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
418 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
419 if (sa6->sin6_scope_id)
420 seq_printf(s, "%%%u", sa6->sin6_scope_id);
423 seq_puts(s, "(unknown)");
426 seq_puts(s, ",rdma");
430 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
432 if (ses->sectype == Unspecified) {
433 if (ses->user_name == NULL)
434 seq_puts(s, ",sec=none");
438 seq_puts(s, ",sec=");
440 switch (ses->sectype) {
442 seq_puts(s, "lanman");
445 seq_puts(s, "ntlmv2");
454 seq_puts(s, "ntlmssp");
457 /* shouldn't ever happen */
458 seq_puts(s, "unknown");
465 if (ses->sectype == Kerberos)
466 seq_printf(s, ",cruid=%u",
467 from_kuid_munged(&init_user_ns, ses->cred_uid));
471 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
473 seq_puts(s, ",cache=");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
476 seq_puts(s, "strict");
477 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
479 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
480 seq_puts(s, "singleclient"); /* assume only one client access */
481 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
482 seq_puts(s, "ro"); /* read only caching assumed */
484 seq_puts(s, "loose");
488 * cifs_show_devname() is used so we show the mount device name with correct
489 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
491 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
493 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
494 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
499 convert_delimiter(devname, '/');
500 /* escape all spaces in share names */
501 seq_escape(m, devname, " \t");
508 * cifs_show_options() is for displaying mount options in /proc/mounts.
509 * Not all settable options are displayed but most of the important
513 cifs_show_options(struct seq_file *s, struct dentry *root)
515 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
516 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
517 struct sockaddr *srcaddr;
518 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
520 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
521 cifs_show_security(s, tcon->ses);
522 cifs_show_cache_flavor(s, cifs_sb);
525 seq_puts(s, ",nolease");
526 if (cifs_sb->ctx->multiuser)
527 seq_puts(s, ",multiuser");
528 else if (tcon->ses->user_name)
529 seq_show_option(s, "username", tcon->ses->user_name);
531 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
532 seq_show_option(s, "domain", tcon->ses->domainName);
534 if (srcaddr->sa_family != AF_UNSPEC) {
535 struct sockaddr_in *saddr4;
536 struct sockaddr_in6 *saddr6;
537 saddr4 = (struct sockaddr_in *)srcaddr;
538 saddr6 = (struct sockaddr_in6 *)srcaddr;
539 if (srcaddr->sa_family == AF_INET6)
540 seq_printf(s, ",srcaddr=%pI6c",
542 else if (srcaddr->sa_family == AF_INET)
543 seq_printf(s, ",srcaddr=%pI4",
544 &saddr4->sin_addr.s_addr);
546 seq_printf(s, ",srcaddr=BAD-AF:%i",
547 (int)(srcaddr->sa_family));
550 seq_printf(s, ",uid=%u",
551 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
552 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
553 seq_puts(s, ",forceuid");
555 seq_puts(s, ",noforceuid");
557 seq_printf(s, ",gid=%u",
558 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
559 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
560 seq_puts(s, ",forcegid");
562 seq_puts(s, ",noforcegid");
564 cifs_show_address(s, tcon->ses->server);
567 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
568 cifs_sb->ctx->file_mode,
569 cifs_sb->ctx->dir_mode);
570 if (cifs_sb->ctx->iocharset)
571 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
573 seq_puts(s, ",seal");
574 else if (tcon->ses->server->ignore_signature)
575 seq_puts(s, ",signloosely");
577 seq_puts(s, ",nocase");
579 seq_puts(s, ",nodelete");
580 if (tcon->local_lease)
581 seq_puts(s, ",locallease");
583 seq_puts(s, ",hard");
585 seq_puts(s, ",soft");
586 if (tcon->use_persistent)
587 seq_puts(s, ",persistenthandles");
588 else if (tcon->use_resilient)
589 seq_puts(s, ",resilienthandles");
590 if (tcon->posix_extensions)
591 seq_puts(s, ",posix");
592 else if (tcon->unix_ext)
593 seq_puts(s, ",unix");
595 seq_puts(s, ",nounix");
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
597 seq_puts(s, ",nodfs");
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
599 seq_puts(s, ",posixpaths");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
601 seq_puts(s, ",setuids");
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
603 seq_puts(s, ",idsfromsid");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
605 seq_puts(s, ",serverino");
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
607 seq_puts(s, ",rwpidforward");
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
609 seq_puts(s, ",forcemand");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
611 seq_puts(s, ",nouser_xattr");
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
613 seq_puts(s, ",mapchars");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
615 seq_puts(s, ",mapposix");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
618 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
619 seq_puts(s, ",nobrl");
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
621 seq_puts(s, ",nohandlecache");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
623 seq_puts(s, ",modefromsid");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
625 seq_puts(s, ",cifsacl");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
627 seq_puts(s, ",dynperm");
628 if (root->d_sb->s_flags & SB_POSIXACL)
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
631 seq_puts(s, ",mfsymlinks");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
635 seq_puts(s, ",nostrictsync");
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
637 seq_puts(s, ",noperm");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
639 seq_printf(s, ",backupuid=%u",
640 from_kuid_munged(&init_user_ns,
641 cifs_sb->ctx->backupuid));
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
643 seq_printf(s, ",backupgid=%u",
644 from_kgid_munged(&init_user_ns,
645 cifs_sb->ctx->backupgid));
647 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
648 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
649 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
650 if (cifs_sb->ctx->rasize)
651 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
652 if (tcon->ses->server->min_offload)
653 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
654 seq_printf(s, ",echo_interval=%lu",
655 tcon->ses->server->echo_interval / HZ);
657 /* Only display max_credits if it was overridden on mount */
658 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
659 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
661 if (tcon->snapshot_time)
662 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
663 if (tcon->handle_timeout)
664 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
667 * Display file and directory attribute timeout in seconds.
668 * If file and directory attribute timeout the same then actimeo
669 * was likely specified on mount
671 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
672 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
674 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
675 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
678 if (tcon->ses->chan_max > 1)
679 seq_printf(s, ",multichannel,max_channels=%zu",
680 tcon->ses->chan_max);
682 if (tcon->use_witness)
683 seq_puts(s, ",witness");
688 static void cifs_umount_begin(struct super_block *sb)
690 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
691 struct cifs_tcon *tcon;
696 tcon = cifs_sb_master_tcon(cifs_sb);
698 spin_lock(&cifs_tcp_ses_lock);
699 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
700 /* we have other mounts to same share or we have
701 already tried to force umount this and woken up
702 all waiting network requests, nothing to do */
703 spin_unlock(&cifs_tcp_ses_lock);
705 } else if (tcon->tc_count == 1)
706 tcon->tidStatus = CifsExiting;
707 spin_unlock(&cifs_tcp_ses_lock);
709 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
710 /* cancel_notify_requests(tcon); */
711 if (tcon->ses && tcon->ses->server) {
712 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
713 wake_up_all(&tcon->ses->server->request_q);
714 wake_up_all(&tcon->ses->server->response_q);
715 msleep(1); /* yield */
716 /* we have to kick the requests once more */
717 wake_up_all(&tcon->ses->server->response_q);
724 #ifdef CONFIG_CIFS_STATS2
725 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
732 static int cifs_drop_inode(struct inode *inode)
734 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
736 /* no serverino => unconditional eviction */
737 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
738 generic_drop_inode(inode);
741 static const struct super_operations cifs_super_ops = {
742 .statfs = cifs_statfs,
743 .alloc_inode = cifs_alloc_inode,
744 .free_inode = cifs_free_inode,
745 .drop_inode = cifs_drop_inode,
746 .evict_inode = cifs_evict_inode,
747 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
748 .show_devname = cifs_show_devname,
749 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
750 function unless later we add lazy close of inodes or unless the
751 kernel forgets to call us with the same number of releases (closes)
753 .show_options = cifs_show_options,
754 .umount_begin = cifs_umount_begin,
755 #ifdef CONFIG_CIFS_STATS2
756 .show_stats = cifs_show_stats,
761 * Get root dentry from superblock according to prefix path mount option.
762 * Return dentry with refcount + 1 on success and NULL otherwise.
764 static struct dentry *
765 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
767 struct dentry *dentry;
768 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
769 char *full_path = NULL;
773 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
774 return dget(sb->s_root);
776 full_path = cifs_build_path_to_root(ctx, cifs_sb,
777 cifs_sb_master_tcon(cifs_sb), 0);
778 if (full_path == NULL)
779 return ERR_PTR(-ENOMEM);
781 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
783 sep = CIFS_DIR_SEP(cifs_sb);
784 dentry = dget(sb->s_root);
788 struct inode *dir = d_inode(dentry);
789 struct dentry *child;
791 if (!S_ISDIR(dir->i_mode)) {
793 dentry = ERR_PTR(-ENOTDIR);
797 /* skip separators */
804 while (*s && *s != sep)
807 child = lookup_positive_unlocked(p, dentry, s - p);
810 } while (!IS_ERR(dentry));
815 static int cifs_set_super(struct super_block *sb, void *data)
817 struct cifs_mnt_data *mnt_data = data;
818 sb->s_fs_info = mnt_data->cifs_sb;
819 return set_anon_super(sb, NULL);
823 cifs_smb3_do_mount(struct file_system_type *fs_type,
824 int flags, struct smb3_fs_context *old_ctx)
827 struct super_block *sb;
828 struct cifs_sb_info *cifs_sb = NULL;
829 struct cifs_mnt_data mnt_data;
833 * Prints in Kernel / CIFS log the attempted mount operation
834 * If CIFS_DEBUG && cifs_FYI
837 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
839 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
841 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
842 if (cifs_sb == NULL) {
843 root = ERR_PTR(-ENOMEM);
847 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
849 root = ERR_PTR(-ENOMEM);
852 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
858 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
864 rc = cifs_setup_cifs_sb(cifs_sb);
870 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
872 if (!(flags & SB_SILENT))
873 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
879 mnt_data.ctx = cifs_sb->ctx;
880 mnt_data.cifs_sb = cifs_sb;
881 mnt_data.flags = flags;
883 /* BB should we make this contingent on mount parm? */
884 flags |= SB_NODIRATIME | SB_NOATIME;
886 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
889 cifs_umount(cifs_sb);
895 cifs_dbg(FYI, "Use existing superblock\n");
896 cifs_umount(cifs_sb);
899 rc = cifs_read_super(sb);
905 sb->s_flags |= SB_ACTIVE;
908 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
913 cifs_sb->root = dget(root);
915 cifs_dbg(FYI, "dentry root is: %p\n", root);
919 deactivate_locked_super(sb);
922 kfree(cifs_sb->prepath);
923 smb3_cleanup_fs_context(cifs_sb->ctx);
931 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
934 struct inode *inode = file_inode(iocb->ki_filp);
936 if (iocb->ki_filp->f_flags & O_DIRECT)
937 return cifs_user_readv(iocb, iter);
939 rc = cifs_revalidate_mapping(inode);
943 return generic_file_read_iter(iocb, iter);
946 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
948 struct inode *inode = file_inode(iocb->ki_filp);
949 struct cifsInodeInfo *cinode = CIFS_I(inode);
953 if (iocb->ki_filp->f_flags & O_DIRECT) {
954 written = cifs_user_writev(iocb, from);
955 if (written > 0 && CIFS_CACHE_READ(cinode)) {
956 cifs_zap_mapping(inode);
958 "Set no oplock for inode=%p after a write operation\n",
965 written = cifs_get_writer(cinode);
969 written = generic_file_write_iter(iocb, from);
971 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
974 rc = filemap_fdatawrite(inode->i_mapping);
976 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
980 cifs_put_writer(cinode);
984 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
986 struct cifsFileInfo *cfile = file->private_data;
987 struct cifs_tcon *tcon;
990 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
991 * the cached file length
993 if (whence != SEEK_SET && whence != SEEK_CUR) {
995 struct inode *inode = file_inode(file);
998 * We need to be sure that all dirty pages are written and the
999 * server has the newest file length.
1001 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1002 inode->i_mapping->nrpages != 0) {
1003 rc = filemap_fdatawait(inode->i_mapping);
1005 mapping_set_error(inode->i_mapping, rc);
1010 * Some applications poll for the file length in this strange
1011 * way so we must seek to end on non-oplocked files by
1012 * setting the revalidate time to zero.
1014 CIFS_I(inode)->time = 0;
1016 rc = cifs_revalidate_file_attr(file);
1020 if (cfile && cfile->tlink) {
1021 tcon = tlink_tcon(cfile->tlink);
1022 if (tcon->ses->server->ops->llseek)
1023 return tcon->ses->server->ops->llseek(file, tcon,
1026 return generic_file_llseek(file, offset, whence);
1030 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1033 * Note that this is called by vfs setlease with i_lock held to
1034 * protect *lease from going away.
1036 struct inode *inode = file_inode(file);
1037 struct cifsFileInfo *cfile = file->private_data;
1039 if (!(S_ISREG(inode->i_mode)))
1042 /* Check if file is oplocked if this is request for new lease */
1043 if (arg == F_UNLCK ||
1044 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1045 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1046 return generic_setlease(file, arg, lease, priv);
1047 else if (tlink_tcon(cfile->tlink)->local_lease &&
1048 !CIFS_CACHE_READ(CIFS_I(inode)))
1050 * If the server claims to support oplock on this file, then we
1051 * still need to check oplock even if the local_lease mount
1052 * option is set, but there are servers which do not support
1053 * oplock for which this mount option may be useful if the user
1054 * knows that the file won't be changed on the server by anyone
1057 return generic_setlease(file, arg, lease, priv);
1062 struct file_system_type cifs_fs_type = {
1063 .owner = THIS_MODULE,
1065 .init_fs_context = smb3_init_fs_context,
1066 .parameters = smb3_fs_parameters,
1067 .kill_sb = cifs_kill_sb,
1068 .fs_flags = FS_RENAME_DOES_D_MOVE,
1070 MODULE_ALIAS_FS("cifs");
1072 static struct file_system_type smb3_fs_type = {
1073 .owner = THIS_MODULE,
1075 .init_fs_context = smb3_init_fs_context,
1076 .parameters = smb3_fs_parameters,
1077 .kill_sb = cifs_kill_sb,
1078 .fs_flags = FS_RENAME_DOES_D_MOVE,
1080 MODULE_ALIAS_FS("smb3");
1081 MODULE_ALIAS("smb3");
1083 const struct inode_operations cifs_dir_inode_ops = {
1084 .create = cifs_create,
1085 .atomic_open = cifs_atomic_open,
1086 .lookup = cifs_lookup,
1087 .getattr = cifs_getattr,
1088 .unlink = cifs_unlink,
1089 .link = cifs_hardlink,
1090 .mkdir = cifs_mkdir,
1091 .rmdir = cifs_rmdir,
1092 .rename = cifs_rename2,
1093 .permission = cifs_permission,
1094 .setattr = cifs_setattr,
1095 .symlink = cifs_symlink,
1096 .mknod = cifs_mknod,
1097 .listxattr = cifs_listxattr,
1100 const struct inode_operations cifs_file_inode_ops = {
1101 .setattr = cifs_setattr,
1102 .getattr = cifs_getattr,
1103 .permission = cifs_permission,
1104 .listxattr = cifs_listxattr,
1105 .fiemap = cifs_fiemap,
1108 const struct inode_operations cifs_symlink_inode_ops = {
1109 .get_link = cifs_get_link,
1110 .permission = cifs_permission,
1111 .listxattr = cifs_listxattr,
1114 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1115 struct file *dst_file, loff_t destoff, loff_t len,
1116 unsigned int remap_flags)
1118 struct inode *src_inode = file_inode(src_file);
1119 struct inode *target_inode = file_inode(dst_file);
1120 struct cifsFileInfo *smb_file_src = src_file->private_data;
1121 struct cifsFileInfo *smb_file_target;
1122 struct cifs_tcon *target_tcon;
1126 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1129 cifs_dbg(FYI, "clone range\n");
1133 if (!src_file->private_data || !dst_file->private_data) {
1135 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1139 smb_file_target = dst_file->private_data;
1140 target_tcon = tlink_tcon(smb_file_target->tlink);
1143 * Note: cifs case is easier than btrfs since server responsible for
1144 * checks for proper open modes and file type and if it wants
1145 * server could even support copy of range where source = target
1147 lock_two_nondirectories(target_inode, src_inode);
1150 len = src_inode->i_size - off;
1152 cifs_dbg(FYI, "about to flush pages\n");
1153 /* should we flush first and last page first */
1154 truncate_inode_pages_range(&target_inode->i_data, destoff,
1155 PAGE_ALIGN(destoff + len)-1);
1157 if (target_tcon->ses->server->ops->duplicate_extents)
1158 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1159 smb_file_src, smb_file_target, off, len, destoff);
1163 /* force revalidate of size and timestamps of target file now
1164 that target is updated on the server */
1165 CIFS_I(target_inode)->time = 0;
1166 /* although unlocking in the reverse order from locking is not
1167 strictly necessary here it is a little cleaner to be consistent */
1168 unlock_two_nondirectories(src_inode, target_inode);
1171 return rc < 0 ? rc : len;
1174 ssize_t cifs_file_copychunk_range(unsigned int xid,
1175 struct file *src_file, loff_t off,
1176 struct file *dst_file, loff_t destoff,
1177 size_t len, unsigned int flags)
1179 struct inode *src_inode = file_inode(src_file);
1180 struct inode *target_inode = file_inode(dst_file);
1181 struct cifsFileInfo *smb_file_src;
1182 struct cifsFileInfo *smb_file_target;
1183 struct cifs_tcon *src_tcon;
1184 struct cifs_tcon *target_tcon;
1187 cifs_dbg(FYI, "copychunk range\n");
1189 if (!src_file->private_data || !dst_file->private_data) {
1191 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1196 smb_file_target = dst_file->private_data;
1197 smb_file_src = src_file->private_data;
1198 src_tcon = tlink_tcon(smb_file_src->tlink);
1199 target_tcon = tlink_tcon(smb_file_target->tlink);
1201 if (src_tcon->ses != target_tcon->ses) {
1202 cifs_dbg(VFS, "source and target of copy not on same server\n");
1207 if (!target_tcon->ses->server->ops->copychunk_range)
1211 * Note: cifs case is easier than btrfs since server responsible for
1212 * checks for proper open modes and file type and if it wants
1213 * server could even support copy of range where source = target
1215 lock_two_nondirectories(target_inode, src_inode);
1217 cifs_dbg(FYI, "about to flush pages\n");
1218 /* should we flush first and last page first */
1219 truncate_inode_pages(&target_inode->i_data, 0);
1221 rc = file_modified(dst_file);
1223 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1224 smb_file_src, smb_file_target, off, len, destoff);
1226 file_accessed(src_file);
1228 /* force revalidate of size and timestamps of target file now
1229 * that target is updated on the server
1231 CIFS_I(target_inode)->time = 0;
1232 /* although unlocking in the reverse order from locking is not
1233 * strictly necessary here it is a little cleaner to be consistent
1235 unlock_two_nondirectories(src_inode, target_inode);
1242 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1243 * is a dummy operation.
1245 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1247 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1253 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1254 struct file *dst_file, loff_t destoff,
1255 size_t len, unsigned int flags)
1257 unsigned int xid = get_xid();
1259 struct cifsFileInfo *cfile = dst_file->private_data;
1261 if (cfile->swapfile)
1264 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1268 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1269 rc = generic_copy_file_range(src_file, off, dst_file,
1270 destoff, len, flags);
1274 const struct file_operations cifs_file_ops = {
1275 .read_iter = cifs_loose_read_iter,
1276 .write_iter = cifs_file_write_iter,
1278 .release = cifs_close,
1280 .flock = cifs_flock,
1281 .fsync = cifs_fsync,
1282 .flush = cifs_flush,
1283 .mmap = cifs_file_mmap,
1284 .splice_read = generic_file_splice_read,
1285 .splice_write = iter_file_splice_write,
1286 .llseek = cifs_llseek,
1287 .unlocked_ioctl = cifs_ioctl,
1288 .copy_file_range = cifs_copy_file_range,
1289 .remap_file_range = cifs_remap_file_range,
1290 .setlease = cifs_setlease,
1291 .fallocate = cifs_fallocate,
1294 const struct file_operations cifs_file_strict_ops = {
1295 .read_iter = cifs_strict_readv,
1296 .write_iter = cifs_strict_writev,
1298 .release = cifs_close,
1300 .flock = cifs_flock,
1301 .fsync = cifs_strict_fsync,
1302 .flush = cifs_flush,
1303 .mmap = cifs_file_strict_mmap,
1304 .splice_read = generic_file_splice_read,
1305 .splice_write = iter_file_splice_write,
1306 .llseek = cifs_llseek,
1307 .unlocked_ioctl = cifs_ioctl,
1308 .copy_file_range = cifs_copy_file_range,
1309 .remap_file_range = cifs_remap_file_range,
1310 .setlease = cifs_setlease,
1311 .fallocate = cifs_fallocate,
1314 const struct file_operations cifs_file_direct_ops = {
1315 .read_iter = cifs_direct_readv,
1316 .write_iter = cifs_direct_writev,
1318 .release = cifs_close,
1320 .flock = cifs_flock,
1321 .fsync = cifs_fsync,
1322 .flush = cifs_flush,
1323 .mmap = cifs_file_mmap,
1324 .splice_read = generic_file_splice_read,
1325 .splice_write = iter_file_splice_write,
1326 .unlocked_ioctl = cifs_ioctl,
1327 .copy_file_range = cifs_copy_file_range,
1328 .remap_file_range = cifs_remap_file_range,
1329 .llseek = cifs_llseek,
1330 .setlease = cifs_setlease,
1331 .fallocate = cifs_fallocate,
1334 const struct file_operations cifs_file_nobrl_ops = {
1335 .read_iter = cifs_loose_read_iter,
1336 .write_iter = cifs_file_write_iter,
1338 .release = cifs_close,
1339 .fsync = cifs_fsync,
1340 .flush = cifs_flush,
1341 .mmap = cifs_file_mmap,
1342 .splice_read = generic_file_splice_read,
1343 .splice_write = iter_file_splice_write,
1344 .llseek = cifs_llseek,
1345 .unlocked_ioctl = cifs_ioctl,
1346 .copy_file_range = cifs_copy_file_range,
1347 .remap_file_range = cifs_remap_file_range,
1348 .setlease = cifs_setlease,
1349 .fallocate = cifs_fallocate,
1352 const struct file_operations cifs_file_strict_nobrl_ops = {
1353 .read_iter = cifs_strict_readv,
1354 .write_iter = cifs_strict_writev,
1356 .release = cifs_close,
1357 .fsync = cifs_strict_fsync,
1358 .flush = cifs_flush,
1359 .mmap = cifs_file_strict_mmap,
1360 .splice_read = generic_file_splice_read,
1361 .splice_write = iter_file_splice_write,
1362 .llseek = cifs_llseek,
1363 .unlocked_ioctl = cifs_ioctl,
1364 .copy_file_range = cifs_copy_file_range,
1365 .remap_file_range = cifs_remap_file_range,
1366 .setlease = cifs_setlease,
1367 .fallocate = cifs_fallocate,
1370 const struct file_operations cifs_file_direct_nobrl_ops = {
1371 .read_iter = cifs_direct_readv,
1372 .write_iter = cifs_direct_writev,
1374 .release = cifs_close,
1375 .fsync = cifs_fsync,
1376 .flush = cifs_flush,
1377 .mmap = cifs_file_mmap,
1378 .splice_read = generic_file_splice_read,
1379 .splice_write = iter_file_splice_write,
1380 .unlocked_ioctl = cifs_ioctl,
1381 .copy_file_range = cifs_copy_file_range,
1382 .remap_file_range = cifs_remap_file_range,
1383 .llseek = cifs_llseek,
1384 .setlease = cifs_setlease,
1385 .fallocate = cifs_fallocate,
1388 const struct file_operations cifs_dir_ops = {
1389 .iterate_shared = cifs_readdir,
1390 .release = cifs_closedir,
1391 .read = generic_read_dir,
1392 .unlocked_ioctl = cifs_ioctl,
1393 .copy_file_range = cifs_copy_file_range,
1394 .remap_file_range = cifs_remap_file_range,
1395 .llseek = generic_file_llseek,
1396 .fsync = cifs_dir_fsync,
1400 cifs_init_once(void *inode)
1402 struct cifsInodeInfo *cifsi = inode;
1404 inode_init_once(&cifsi->vfs_inode);
1405 init_rwsem(&cifsi->lock_sem);
1409 cifs_init_inodecache(void)
1411 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1412 sizeof(struct cifsInodeInfo),
1413 0, (SLAB_RECLAIM_ACCOUNT|
1414 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1416 if (cifs_inode_cachep == NULL)
1423 cifs_destroy_inodecache(void)
1426 * Make sure all delayed rcu free inodes are flushed before we
1430 kmem_cache_destroy(cifs_inode_cachep);
1434 cifs_init_request_bufs(void)
1437 * SMB2 maximum header size is bigger than CIFS one - no problems to
1438 * allocate some more bytes for CIFS.
1440 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1442 if (CIFSMaxBufSize < 8192) {
1443 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1444 Unicode path name has to fit in any SMB/CIFS path based frames */
1445 CIFSMaxBufSize = 8192;
1446 } else if (CIFSMaxBufSize > 1024*127) {
1447 CIFSMaxBufSize = 1024 * 127;
1449 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1452 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1453 CIFSMaxBufSize, CIFSMaxBufSize);
1455 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1456 CIFSMaxBufSize + max_hdr_size, 0,
1457 SLAB_HWCACHE_ALIGN, 0,
1458 CIFSMaxBufSize + max_hdr_size,
1460 if (cifs_req_cachep == NULL)
1463 if (cifs_min_rcv < 1)
1465 else if (cifs_min_rcv > 64) {
1467 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1470 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1473 if (cifs_req_poolp == NULL) {
1474 kmem_cache_destroy(cifs_req_cachep);
1477 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1478 almost all handle based requests (but not write response, nor is it
1479 sufficient for path based requests). A smaller size would have
1480 been more efficient (compacting multiple slab items on one 4k page)
1481 for the case in which debug was on, but this larger size allows
1482 more SMBs to use small buffer alloc and is still much more
1483 efficient to alloc 1 per page off the slab compared to 17K (5page)
1484 alloc of large cifs buffers even when page debugging is on */
1485 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1486 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1487 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1488 if (cifs_sm_req_cachep == NULL) {
1489 mempool_destroy(cifs_req_poolp);
1490 kmem_cache_destroy(cifs_req_cachep);
1494 if (cifs_min_small < 2)
1496 else if (cifs_min_small > 256) {
1497 cifs_min_small = 256;
1498 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1501 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1502 cifs_sm_req_cachep);
1504 if (cifs_sm_req_poolp == NULL) {
1505 mempool_destroy(cifs_req_poolp);
1506 kmem_cache_destroy(cifs_req_cachep);
1507 kmem_cache_destroy(cifs_sm_req_cachep);
1515 cifs_destroy_request_bufs(void)
1517 mempool_destroy(cifs_req_poolp);
1518 kmem_cache_destroy(cifs_req_cachep);
1519 mempool_destroy(cifs_sm_req_poolp);
1520 kmem_cache_destroy(cifs_sm_req_cachep);
1524 cifs_init_mids(void)
1526 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1527 sizeof(struct mid_q_entry), 0,
1528 SLAB_HWCACHE_ALIGN, NULL);
1529 if (cifs_mid_cachep == NULL)
1532 /* 3 is a reasonable minimum number of simultaneous operations */
1533 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1534 if (cifs_mid_poolp == NULL) {
1535 kmem_cache_destroy(cifs_mid_cachep);
1543 cifs_destroy_mids(void)
1545 mempool_destroy(cifs_mid_poolp);
1546 kmem_cache_destroy(cifs_mid_cachep);
1554 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1556 * Initialize Global counters
1558 atomic_set(&sesInfoAllocCount, 0);
1559 atomic_set(&tconInfoAllocCount, 0);
1560 atomic_set(&tcpSesNextId, 0);
1561 atomic_set(&tcpSesAllocCount, 0);
1562 atomic_set(&tcpSesReconnectCount, 0);
1563 atomic_set(&tconInfoReconnectCount, 0);
1565 atomic_set(&bufAllocCount, 0);
1566 atomic_set(&smBufAllocCount, 0);
1567 #ifdef CONFIG_CIFS_STATS2
1568 atomic_set(&totBufAllocCount, 0);
1569 atomic_set(&totSmBufAllocCount, 0);
1570 if (slow_rsp_threshold < 1)
1571 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1572 else if (slow_rsp_threshold > 32767)
1574 "slow response threshold set higher than recommended (0 to 32767)\n");
1575 #endif /* CONFIG_CIFS_STATS2 */
1577 atomic_set(&midCount, 0);
1578 GlobalCurrentXid = 0;
1579 GlobalTotalActiveXid = 0;
1580 GlobalMaxActiveXid = 0;
1581 spin_lock_init(&cifs_tcp_ses_lock);
1582 spin_lock_init(&GlobalMid_Lock);
1584 cifs_lock_secret = get_random_u32();
1586 if (cifs_max_pending < 2) {
1587 cifs_max_pending = 2;
1588 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1589 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1590 cifs_max_pending = CIFS_MAX_REQ;
1591 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1595 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1598 goto out_clean_proc;
1602 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1603 * so that we don't launch too many worker threads but
1604 * Documentation/core-api/workqueue.rst recommends setting it to 0
1607 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1608 decrypt_wq = alloc_workqueue("smb3decryptd",
1609 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1612 goto out_destroy_cifsiod_wq;
1615 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1616 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1617 if (!fileinfo_put_wq) {
1619 goto out_destroy_decrypt_wq;
1622 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1623 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1624 if (!cifsoplockd_wq) {
1626 goto out_destroy_fileinfo_put_wq;
1629 deferredclose_wq = alloc_workqueue("deferredclose",
1630 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1631 if (!deferredclose_wq) {
1633 goto out_destroy_cifsoplockd_wq;
1636 rc = cifs_fscache_register();
1638 goto out_destroy_deferredclose_wq;
1640 rc = cifs_init_inodecache();
1642 goto out_unreg_fscache;
1644 rc = cifs_init_mids();
1646 goto out_destroy_inodecache;
1648 rc = cifs_init_request_bufs();
1650 goto out_destroy_mids;
1652 #ifdef CONFIG_CIFS_DFS_UPCALL
1653 rc = dfs_cache_init();
1655 goto out_destroy_request_bufs;
1656 #endif /* CONFIG_CIFS_DFS_UPCALL */
1657 #ifdef CONFIG_CIFS_UPCALL
1658 rc = init_cifs_spnego();
1660 goto out_destroy_dfs_cache;
1661 #endif /* CONFIG_CIFS_UPCALL */
1662 #ifdef CONFIG_CIFS_SWN_UPCALL
1663 rc = cifs_genl_init();
1665 goto out_register_key_type;
1666 #endif /* CONFIG_CIFS_SWN_UPCALL */
1668 rc = init_cifs_idmap();
1670 goto out_cifs_swn_init;
1672 rc = register_filesystem(&cifs_fs_type);
1674 goto out_init_cifs_idmap;
1676 rc = register_filesystem(&smb3_fs_type);
1678 unregister_filesystem(&cifs_fs_type);
1679 goto out_init_cifs_idmap;
1684 out_init_cifs_idmap:
1687 #ifdef CONFIG_CIFS_SWN_UPCALL
1689 out_register_key_type:
1691 #ifdef CONFIG_CIFS_UPCALL
1693 out_destroy_dfs_cache:
1695 #ifdef CONFIG_CIFS_DFS_UPCALL
1696 dfs_cache_destroy();
1697 out_destroy_request_bufs:
1699 cifs_destroy_request_bufs();
1701 cifs_destroy_mids();
1702 out_destroy_inodecache:
1703 cifs_destroy_inodecache();
1705 cifs_fscache_unregister();
1706 out_destroy_deferredclose_wq:
1707 destroy_workqueue(deferredclose_wq);
1708 out_destroy_cifsoplockd_wq:
1709 destroy_workqueue(cifsoplockd_wq);
1710 out_destroy_fileinfo_put_wq:
1711 destroy_workqueue(fileinfo_put_wq);
1712 out_destroy_decrypt_wq:
1713 destroy_workqueue(decrypt_wq);
1714 out_destroy_cifsiod_wq:
1715 destroy_workqueue(cifsiod_wq);
1724 cifs_dbg(NOISY, "exit_smb3\n");
1725 unregister_filesystem(&cifs_fs_type);
1726 unregister_filesystem(&smb3_fs_type);
1727 cifs_dfs_release_automount_timer();
1729 #ifdef CONFIG_CIFS_SWN_UPCALL
1732 #ifdef CONFIG_CIFS_UPCALL
1735 #ifdef CONFIG_CIFS_DFS_UPCALL
1736 dfs_cache_destroy();
1738 cifs_destroy_request_bufs();
1739 cifs_destroy_mids();
1740 cifs_destroy_inodecache();
1741 cifs_fscache_unregister();
1742 destroy_workqueue(deferredclose_wq);
1743 destroy_workqueue(cifsoplockd_wq);
1744 destroy_workqueue(decrypt_wq);
1745 destroy_workqueue(fileinfo_put_wq);
1746 destroy_workqueue(cifsiod_wq);
1750 MODULE_AUTHOR("Steve French");
1751 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1753 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1754 "also older servers complying with the SNIA CIFS Specification)");
1755 MODULE_VERSION(CIFS_VERSION);
1756 MODULE_SOFTDEP("ecb");
1757 MODULE_SOFTDEP("hmac");
1758 MODULE_SOFTDEP("md4");
1759 MODULE_SOFTDEP("md5");
1760 MODULE_SOFTDEP("nls");
1761 MODULE_SOFTDEP("aes");
1762 MODULE_SOFTDEP("cmac");
1763 MODULE_SOFTDEP("sha256");
1764 MODULE_SOFTDEP("sha512");
1765 MODULE_SOFTDEP("aead2");
1766 MODULE_SOFTDEP("ccm");
1767 MODULE_SOFTDEP("gcm");
1768 module_init(init_cifs)
1769 module_exit(exit_cifs)