1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
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>
29 #include <uapi/linux/magic.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"
42 #ifdef CONFIG_CIFS_DFS_UPCALL
43 #include "dfs_cache.h"
45 #ifdef CONFIG_CIFS_SWN_UPCALL
48 #include "fs_context.h"
51 * DOS dates from 1980/1/1 through 2107/12/31
52 * Protocol specifications indicate the range should be to 119, which
53 * limits maximum year to 2099. But this range has not been checked.
55 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
56 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
57 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
61 bool enable_oplocks = true;
62 bool linuxExtEnabled = true;
63 bool lookupCacheEnabled = true;
64 bool disable_legacy_dialects; /* false by default */
65 bool enable_gcm_256 = true;
66 bool require_gcm_256; /* false by default */
67 bool enable_negotiate_signing; /* false by default */
68 unsigned int global_secflags = CIFSSEC_DEF;
69 /* unsigned int ntlmv2_support = 0; */
70 unsigned int sign_CIFS_PDUs = 1;
71 static const struct super_operations cifs_super_ops;
72 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
73 module_param(CIFSMaxBufSize, uint, 0444);
74 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
76 "Default: 16384 Range: 8192 to 130048");
77 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
78 module_param(cifs_min_rcv, uint, 0444);
79 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
81 unsigned int cifs_min_small = 30;
82 module_param(cifs_min_small, uint, 0444);
83 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
85 unsigned int cifs_max_pending = CIFS_MAX_REQ;
86 module_param(cifs_max_pending, uint, 0444);
87 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
88 "CIFS/SMB1 dialect (N/A for SMB3) "
89 "Default: 32767 Range: 2 to 32767.");
90 #ifdef CONFIG_CIFS_STATS2
91 unsigned int slow_rsp_threshold = 1;
92 module_param(slow_rsp_threshold, uint, 0644);
93 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
94 "before logging that a response is delayed. "
95 "Default: 1 (if set to 0 disables msg).");
98 module_param(enable_oplocks, bool, 0644);
99 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
101 module_param(enable_gcm_256, bool, 0644);
102 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
104 module_param(require_gcm_256, bool, 0644);
105 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
107 module_param(enable_negotiate_signing, bool, 0644);
108 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
110 module_param(disable_legacy_dialects, bool, 0644);
111 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
112 "helpful to restrict the ability to "
113 "override the default dialects (SMB2.1, "
114 "SMB3 and SMB3.02) on mount with old "
115 "dialects (CIFS/SMB1 and SMB2) since "
116 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
117 " and less secure. Default: n/N/0");
119 extern mempool_t *cifs_sm_req_poolp;
120 extern mempool_t *cifs_req_poolp;
121 extern mempool_t *cifs_mid_poolp;
123 struct workqueue_struct *cifsiod_wq;
124 struct workqueue_struct *decrypt_wq;
125 struct workqueue_struct *fileinfo_put_wq;
126 struct workqueue_struct *cifsoplockd_wq;
127 struct workqueue_struct *deferredclose_wq;
128 __u32 cifs_lock_secret;
131 * Bumps refcount for cifs super block.
132 * Note that it should be only called if a referece to VFS super block is
133 * already held, e.g. in open-type syscalls context. Otherwise it can race with
134 * atomic_dec_and_test in deactivate_locked_super.
137 cifs_sb_active(struct super_block *sb)
139 struct cifs_sb_info *server = CIFS_SB(sb);
141 if (atomic_inc_return(&server->active) == 1)
142 atomic_inc(&sb->s_active);
146 cifs_sb_deactive(struct super_block *sb)
148 struct cifs_sb_info *server = CIFS_SB(sb);
150 if (atomic_dec_and_test(&server->active))
151 deactivate_super(sb);
155 cifs_read_super(struct super_block *sb)
158 struct cifs_sb_info *cifs_sb;
159 struct cifs_tcon *tcon;
160 struct timespec64 ts;
163 cifs_sb = CIFS_SB(sb);
164 tcon = cifs_sb_master_tcon(cifs_sb);
166 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
167 sb->s_flags |= SB_POSIXACL;
169 if (tcon->snapshot_time)
170 sb->s_flags |= SB_RDONLY;
172 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
173 sb->s_maxbytes = MAX_LFS_FILESIZE;
175 sb->s_maxbytes = MAX_NON_LFS;
178 * Some very old servers like DOS and OS/2 used 2 second granularity
179 * (while all current servers use 100ns granularity - see MS-DTYP)
180 * but 1 second is the maximum allowed granularity for the VFS
181 * so for old servers set time granularity to 1 second while for
182 * everything else (current servers) set it to 100ns.
184 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
185 ((tcon->ses->capabilities &
186 tcon->ses->server->vals->cap_nt_find) == 0) &&
188 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
189 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
190 sb->s_time_min = ts.tv_sec;
191 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
192 cpu_to_le16(SMB_TIME_MAX), 0);
193 sb->s_time_max = ts.tv_sec;
196 * Almost every server, including all SMB2+, uses DCE TIME
197 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
199 sb->s_time_gran = 100;
200 ts = cifs_NTtimeToUnix(0);
201 sb->s_time_min = ts.tv_sec;
202 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
203 sb->s_time_max = ts.tv_sec;
206 sb->s_magic = CIFS_SUPER_MAGIC;
207 sb->s_op = &cifs_super_ops;
208 sb->s_xattr = cifs_xattr_handlers;
209 rc = super_setup_bdi(sb);
212 /* tune readahead according to rsize if readahead size not set on mount */
213 if (cifs_sb->ctx->rasize)
214 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
216 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
218 sb->s_blocksize = CIFS_MAX_MSGSIZE;
219 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
220 inode = cifs_root_iget(sb);
228 sb->s_d_op = &cifs_ci_dentry_ops;
230 sb->s_d_op = &cifs_dentry_ops;
232 sb->s_root = d_make_root(inode);
238 #ifdef CONFIG_CIFS_NFSD_EXPORT
239 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
240 cifs_dbg(FYI, "export ops supported\n");
241 sb->s_export_op = &cifs_export_ops;
243 #endif /* CONFIG_CIFS_NFSD_EXPORT */
248 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
252 static void cifs_kill_sb(struct super_block *sb)
254 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
255 struct cifs_tcon *tcon;
256 struct cached_fid *cfid;
259 * We ned to release all dentries for the cached directories
260 * before we kill the sb.
264 cifs_sb->root = NULL;
266 tcon = cifs_sb_master_tcon(cifs_sb);
269 mutex_lock(&cfid->fid_mutex);
275 mutex_unlock(&cfid->fid_mutex);
279 cifs_umount(cifs_sb);
283 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
285 struct super_block *sb = dentry->d_sb;
286 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
287 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
288 struct TCP_Server_Info *server = tcon->ses->server;
294 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
296 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
298 buf->f_namelen = PATH_MAX;
300 buf->f_fsid.val[0] = tcon->vol_serial_number;
301 /* are using part of create time for more randomness, see man statfs */
302 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
304 buf->f_files = 0; /* undefined */
305 buf->f_ffree = 0; /* unlimited */
307 if (server->ops->queryfs)
308 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
314 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
316 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
317 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
318 struct TCP_Server_Info *server = tcon->ses->server;
320 if (server->ops->fallocate)
321 return server->ops->fallocate(file, tcon, mode, off, len);
326 static int cifs_permission(struct user_namespace *mnt_userns,
327 struct inode *inode, int mask)
329 struct cifs_sb_info *cifs_sb;
331 cifs_sb = CIFS_SB(inode->i_sb);
333 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
334 if ((mask & MAY_EXEC) && !execute_ok(inode))
338 } else /* file mode might have been restricted at mount time
339 on the client (above and beyond ACL on servers) for
340 servers which do not support setting and viewing mode bits,
341 so allowing client to check permissions is useful */
342 return generic_permission(&init_user_ns, inode, mask);
345 static struct kmem_cache *cifs_inode_cachep;
346 static struct kmem_cache *cifs_req_cachep;
347 static struct kmem_cache *cifs_mid_cachep;
348 static struct kmem_cache *cifs_sm_req_cachep;
349 mempool_t *cifs_sm_req_poolp;
350 mempool_t *cifs_req_poolp;
351 mempool_t *cifs_mid_poolp;
353 static struct inode *
354 cifs_alloc_inode(struct super_block *sb)
356 struct cifsInodeInfo *cifs_inode;
357 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
360 cifs_inode->cifsAttrs = 0x20; /* default */
361 cifs_inode->time = 0;
363 * Until the file is open and we have gotten oplock info back from the
364 * server, can not assume caching of file data or metadata.
366 cifs_set_oplock_level(cifs_inode, 0);
367 cifs_inode->flags = 0;
368 spin_lock_init(&cifs_inode->writers_lock);
369 cifs_inode->writers = 0;
370 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
371 cifs_inode->server_eof = 0;
372 cifs_inode->uniqueid = 0;
373 cifs_inode->createtime = 0;
374 cifs_inode->epoch = 0;
375 spin_lock_init(&cifs_inode->open_file_lock);
376 generate_random_uuid(cifs_inode->lease_key);
379 * Can not set i_flags here - they get immediately overwritten to zero
382 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
383 INIT_LIST_HEAD(&cifs_inode->openFileList);
384 INIT_LIST_HEAD(&cifs_inode->llist);
385 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
386 spin_lock_init(&cifs_inode->deferred_lock);
387 return &cifs_inode->vfs_inode;
391 cifs_free_inode(struct inode *inode)
393 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
397 cifs_evict_inode(struct inode *inode)
399 truncate_inode_pages_final(&inode->i_data);
400 if (inode->i_state & I_PINNING_FSCACHE_WB)
401 cifs_fscache_unuse_inode_cookie(inode, true);
402 cifs_fscache_release_inode_cookie(inode);
407 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
409 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
410 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
412 seq_puts(s, ",addr=");
414 switch (server->dstaddr.ss_family) {
416 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
419 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
420 if (sa6->sin6_scope_id)
421 seq_printf(s, "%%%u", sa6->sin6_scope_id);
424 seq_puts(s, "(unknown)");
427 seq_puts(s, ",rdma");
431 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
433 if (ses->sectype == Unspecified) {
434 if (ses->user_name == NULL)
435 seq_puts(s, ",sec=none");
439 seq_puts(s, ",sec=");
441 switch (ses->sectype) {
443 seq_puts(s, "ntlmv2");
449 seq_puts(s, "ntlmssp");
452 /* shouldn't ever happen */
453 seq_puts(s, "unknown");
460 if (ses->sectype == Kerberos)
461 seq_printf(s, ",cruid=%u",
462 from_kuid_munged(&init_user_ns, ses->cred_uid));
466 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
468 seq_puts(s, ",cache=");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
471 seq_puts(s, "strict");
472 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
474 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
475 seq_puts(s, "singleclient"); /* assume only one client access */
476 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
477 seq_puts(s, "ro"); /* read only caching assumed */
479 seq_puts(s, "loose");
483 * cifs_show_devname() is used so we show the mount device name with correct
484 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
486 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
488 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
489 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
494 convert_delimiter(devname, '/');
495 /* escape all spaces in share names */
496 seq_escape(m, devname, " \t");
503 * cifs_show_options() is for displaying mount options in /proc/mounts.
504 * Not all settable options are displayed but most of the important
508 cifs_show_options(struct seq_file *s, struct dentry *root)
510 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
511 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
512 struct sockaddr *srcaddr;
513 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
515 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
516 cifs_show_security(s, tcon->ses);
517 cifs_show_cache_flavor(s, cifs_sb);
520 seq_puts(s, ",nolease");
521 if (cifs_sb->ctx->multiuser)
522 seq_puts(s, ",multiuser");
523 else if (tcon->ses->user_name)
524 seq_show_option(s, "username", tcon->ses->user_name);
526 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
527 seq_show_option(s, "domain", tcon->ses->domainName);
529 if (srcaddr->sa_family != AF_UNSPEC) {
530 struct sockaddr_in *saddr4;
531 struct sockaddr_in6 *saddr6;
532 saddr4 = (struct sockaddr_in *)srcaddr;
533 saddr6 = (struct sockaddr_in6 *)srcaddr;
534 if (srcaddr->sa_family == AF_INET6)
535 seq_printf(s, ",srcaddr=%pI6c",
537 else if (srcaddr->sa_family == AF_INET)
538 seq_printf(s, ",srcaddr=%pI4",
539 &saddr4->sin_addr.s_addr);
541 seq_printf(s, ",srcaddr=BAD-AF:%i",
542 (int)(srcaddr->sa_family));
545 seq_printf(s, ",uid=%u",
546 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
547 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
548 seq_puts(s, ",forceuid");
550 seq_puts(s, ",noforceuid");
552 seq_printf(s, ",gid=%u",
553 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
554 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
555 seq_puts(s, ",forcegid");
557 seq_puts(s, ",noforcegid");
559 cifs_show_address(s, tcon->ses->server);
562 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
563 cifs_sb->ctx->file_mode,
564 cifs_sb->ctx->dir_mode);
565 if (cifs_sb->ctx->iocharset)
566 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
568 seq_puts(s, ",seal");
569 else if (tcon->ses->server->ignore_signature)
570 seq_puts(s, ",signloosely");
572 seq_puts(s, ",nocase");
574 seq_puts(s, ",nodelete");
575 if (tcon->local_lease)
576 seq_puts(s, ",locallease");
578 seq_puts(s, ",hard");
580 seq_puts(s, ",soft");
581 if (tcon->use_persistent)
582 seq_puts(s, ",persistenthandles");
583 else if (tcon->use_resilient)
584 seq_puts(s, ",resilienthandles");
585 if (tcon->posix_extensions)
586 seq_puts(s, ",posix");
587 else if (tcon->unix_ext)
588 seq_puts(s, ",unix");
590 seq_puts(s, ",nounix");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
592 seq_puts(s, ",nodfs");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
594 seq_puts(s, ",posixpaths");
595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
596 seq_puts(s, ",setuids");
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
598 seq_puts(s, ",idsfromsid");
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
600 seq_puts(s, ",serverino");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
602 seq_puts(s, ",rwpidforward");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
604 seq_puts(s, ",forcemand");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
606 seq_puts(s, ",nouser_xattr");
607 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
608 seq_puts(s, ",mapchars");
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
610 seq_puts(s, ",mapposix");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
614 seq_puts(s, ",nobrl");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
616 seq_puts(s, ",nohandlecache");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
618 seq_puts(s, ",modefromsid");
619 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
620 seq_puts(s, ",cifsacl");
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
622 seq_puts(s, ",dynperm");
623 if (root->d_sb->s_flags & SB_POSIXACL)
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
626 seq_puts(s, ",mfsymlinks");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
630 seq_puts(s, ",nostrictsync");
631 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
632 seq_puts(s, ",noperm");
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
634 seq_printf(s, ",backupuid=%u",
635 from_kuid_munged(&init_user_ns,
636 cifs_sb->ctx->backupuid));
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
638 seq_printf(s, ",backupgid=%u",
639 from_kgid_munged(&init_user_ns,
640 cifs_sb->ctx->backupgid));
642 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
643 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
644 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
645 if (cifs_sb->ctx->rasize)
646 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
647 if (tcon->ses->server->min_offload)
648 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
649 seq_printf(s, ",echo_interval=%lu",
650 tcon->ses->server->echo_interval / HZ);
652 /* Only display max_credits if it was overridden on mount */
653 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
654 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
656 if (tcon->snapshot_time)
657 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
658 if (tcon->handle_timeout)
659 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
662 * Display file and directory attribute timeout in seconds.
663 * If file and directory attribute timeout the same then actimeo
664 * was likely specified on mount
666 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
667 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
669 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
670 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
673 if (tcon->ses->chan_max > 1)
674 seq_printf(s, ",multichannel,max_channels=%zu",
675 tcon->ses->chan_max);
677 if (tcon->use_witness)
678 seq_puts(s, ",witness");
683 static void cifs_umount_begin(struct super_block *sb)
685 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
686 struct cifs_tcon *tcon;
691 tcon = cifs_sb_master_tcon(cifs_sb);
693 spin_lock(&cifs_tcp_ses_lock);
694 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
695 /* we have other mounts to same share or we have
696 already tried to force umount this and woken up
697 all waiting network requests, nothing to do */
698 spin_unlock(&cifs_tcp_ses_lock);
700 } else if (tcon->tc_count == 1)
701 tcon->tidStatus = CifsExiting;
702 spin_unlock(&cifs_tcp_ses_lock);
704 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
705 /* cancel_notify_requests(tcon); */
706 if (tcon->ses && tcon->ses->server) {
707 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
708 wake_up_all(&tcon->ses->server->request_q);
709 wake_up_all(&tcon->ses->server->response_q);
710 msleep(1); /* yield */
711 /* we have to kick the requests once more */
712 wake_up_all(&tcon->ses->server->response_q);
719 #ifdef CONFIG_CIFS_STATS2
720 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
727 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
729 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
733 static int cifs_drop_inode(struct inode *inode)
735 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
737 /* no serverino => unconditional eviction */
738 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
739 generic_drop_inode(inode);
742 static const struct super_operations cifs_super_ops = {
743 .statfs = cifs_statfs,
744 .alloc_inode = cifs_alloc_inode,
745 .write_inode = cifs_write_inode,
746 .free_inode = cifs_free_inode,
747 .drop_inode = cifs_drop_inode,
748 .evict_inode = cifs_evict_inode,
749 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
750 .show_devname = cifs_show_devname,
751 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
752 function unless later we add lazy close of inodes or unless the
753 kernel forgets to call us with the same number of releases (closes)
755 .show_options = cifs_show_options,
756 .umount_begin = cifs_umount_begin,
757 #ifdef CONFIG_CIFS_STATS2
758 .show_stats = cifs_show_stats,
763 * Get root dentry from superblock according to prefix path mount option.
764 * Return dentry with refcount + 1 on success and NULL otherwise.
766 static struct dentry *
767 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
769 struct dentry *dentry;
770 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
771 char *full_path = NULL;
775 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
776 return dget(sb->s_root);
778 full_path = cifs_build_path_to_root(ctx, cifs_sb,
779 cifs_sb_master_tcon(cifs_sb), 0);
780 if (full_path == NULL)
781 return ERR_PTR(-ENOMEM);
783 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
785 sep = CIFS_DIR_SEP(cifs_sb);
786 dentry = dget(sb->s_root);
790 struct inode *dir = d_inode(dentry);
791 struct dentry *child;
793 if (!S_ISDIR(dir->i_mode)) {
795 dentry = ERR_PTR(-ENOTDIR);
799 /* skip separators */
806 while (*s && *s != sep)
809 child = lookup_positive_unlocked(p, dentry, s - p);
812 } while (!IS_ERR(dentry));
817 static int cifs_set_super(struct super_block *sb, void *data)
819 struct cifs_mnt_data *mnt_data = data;
820 sb->s_fs_info = mnt_data->cifs_sb;
821 return set_anon_super(sb, NULL);
825 cifs_smb3_do_mount(struct file_system_type *fs_type,
826 int flags, struct smb3_fs_context *old_ctx)
829 struct super_block *sb;
830 struct cifs_sb_info *cifs_sb = NULL;
831 struct cifs_mnt_data mnt_data;
835 * Prints in Kernel / CIFS log the attempted mount operation
836 * If CIFS_DEBUG && cifs_FYI
839 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
841 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
843 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
844 if (cifs_sb == NULL) {
845 root = ERR_PTR(-ENOMEM);
849 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
851 root = ERR_PTR(-ENOMEM);
854 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
860 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
866 rc = cifs_setup_cifs_sb(cifs_sb);
872 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
874 if (!(flags & SB_SILENT))
875 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
881 mnt_data.ctx = cifs_sb->ctx;
882 mnt_data.cifs_sb = cifs_sb;
883 mnt_data.flags = flags;
885 /* BB should we make this contingent on mount parm? */
886 flags |= SB_NODIRATIME | SB_NOATIME;
888 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
891 cifs_umount(cifs_sb);
897 cifs_dbg(FYI, "Use existing superblock\n");
898 cifs_umount(cifs_sb);
901 rc = cifs_read_super(sb);
907 sb->s_flags |= SB_ACTIVE;
910 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
915 cifs_sb->root = dget(root);
917 cifs_dbg(FYI, "dentry root is: %p\n", root);
921 deactivate_locked_super(sb);
925 kfree(cifs_sb->prepath);
926 smb3_cleanup_fs_context(cifs_sb->ctx);
934 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
937 struct inode *inode = file_inode(iocb->ki_filp);
939 if (iocb->ki_filp->f_flags & O_DIRECT)
940 return cifs_user_readv(iocb, iter);
942 rc = cifs_revalidate_mapping(inode);
946 return generic_file_read_iter(iocb, iter);
949 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
951 struct inode *inode = file_inode(iocb->ki_filp);
952 struct cifsInodeInfo *cinode = CIFS_I(inode);
956 if (iocb->ki_filp->f_flags & O_DIRECT) {
957 written = cifs_user_writev(iocb, from);
958 if (written > 0 && CIFS_CACHE_READ(cinode)) {
959 cifs_zap_mapping(inode);
961 "Set no oplock for inode=%p after a write operation\n",
968 written = cifs_get_writer(cinode);
972 written = generic_file_write_iter(iocb, from);
974 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
977 rc = filemap_fdatawrite(inode->i_mapping);
979 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
983 cifs_put_writer(cinode);
987 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
989 struct cifsFileInfo *cfile = file->private_data;
990 struct cifs_tcon *tcon;
993 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
994 * the cached file length
996 if (whence != SEEK_SET && whence != SEEK_CUR) {
998 struct inode *inode = file_inode(file);
1001 * We need to be sure that all dirty pages are written and the
1002 * server has the newest file length.
1004 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1005 inode->i_mapping->nrpages != 0) {
1006 rc = filemap_fdatawait(inode->i_mapping);
1008 mapping_set_error(inode->i_mapping, rc);
1013 * Some applications poll for the file length in this strange
1014 * way so we must seek to end on non-oplocked files by
1015 * setting the revalidate time to zero.
1017 CIFS_I(inode)->time = 0;
1019 rc = cifs_revalidate_file_attr(file);
1023 if (cfile && cfile->tlink) {
1024 tcon = tlink_tcon(cfile->tlink);
1025 if (tcon->ses->server->ops->llseek)
1026 return tcon->ses->server->ops->llseek(file, tcon,
1029 return generic_file_llseek(file, offset, whence);
1033 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1036 * Note that this is called by vfs setlease with i_lock held to
1037 * protect *lease from going away.
1039 struct inode *inode = file_inode(file);
1040 struct cifsFileInfo *cfile = file->private_data;
1042 if (!(S_ISREG(inode->i_mode)))
1045 /* Check if file is oplocked if this is request for new lease */
1046 if (arg == F_UNLCK ||
1047 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1048 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1049 return generic_setlease(file, arg, lease, priv);
1050 else if (tlink_tcon(cfile->tlink)->local_lease &&
1051 !CIFS_CACHE_READ(CIFS_I(inode)))
1053 * If the server claims to support oplock on this file, then we
1054 * still need to check oplock even if the local_lease mount
1055 * option is set, but there are servers which do not support
1056 * oplock for which this mount option may be useful if the user
1057 * knows that the file won't be changed on the server by anyone
1060 return generic_setlease(file, arg, lease, priv);
1065 struct file_system_type cifs_fs_type = {
1066 .owner = THIS_MODULE,
1068 .init_fs_context = smb3_init_fs_context,
1069 .parameters = smb3_fs_parameters,
1070 .kill_sb = cifs_kill_sb,
1071 .fs_flags = FS_RENAME_DOES_D_MOVE,
1073 MODULE_ALIAS_FS("cifs");
1075 static struct file_system_type smb3_fs_type = {
1076 .owner = THIS_MODULE,
1078 .init_fs_context = smb3_init_fs_context,
1079 .parameters = smb3_fs_parameters,
1080 .kill_sb = cifs_kill_sb,
1081 .fs_flags = FS_RENAME_DOES_D_MOVE,
1083 MODULE_ALIAS_FS("smb3");
1084 MODULE_ALIAS("smb3");
1086 const struct inode_operations cifs_dir_inode_ops = {
1087 .create = cifs_create,
1088 .atomic_open = cifs_atomic_open,
1089 .lookup = cifs_lookup,
1090 .getattr = cifs_getattr,
1091 .unlink = cifs_unlink,
1092 .link = cifs_hardlink,
1093 .mkdir = cifs_mkdir,
1094 .rmdir = cifs_rmdir,
1095 .rename = cifs_rename2,
1096 .permission = cifs_permission,
1097 .setattr = cifs_setattr,
1098 .symlink = cifs_symlink,
1099 .mknod = cifs_mknod,
1100 .listxattr = cifs_listxattr,
1103 const struct inode_operations cifs_file_inode_ops = {
1104 .setattr = cifs_setattr,
1105 .getattr = cifs_getattr,
1106 .permission = cifs_permission,
1107 .listxattr = cifs_listxattr,
1108 .fiemap = cifs_fiemap,
1111 const struct inode_operations cifs_symlink_inode_ops = {
1112 .get_link = cifs_get_link,
1113 .permission = cifs_permission,
1114 .listxattr = cifs_listxattr,
1117 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1118 struct file *dst_file, loff_t destoff, loff_t len,
1119 unsigned int remap_flags)
1121 struct inode *src_inode = file_inode(src_file);
1122 struct inode *target_inode = file_inode(dst_file);
1123 struct cifsFileInfo *smb_file_src = src_file->private_data;
1124 struct cifsFileInfo *smb_file_target;
1125 struct cifs_tcon *target_tcon;
1129 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1132 cifs_dbg(FYI, "clone range\n");
1136 if (!src_file->private_data || !dst_file->private_data) {
1138 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1142 smb_file_target = dst_file->private_data;
1143 target_tcon = tlink_tcon(smb_file_target->tlink);
1146 * Note: cifs case is easier than btrfs since server responsible for
1147 * checks for proper open modes and file type and if it wants
1148 * server could even support copy of range where source = target
1150 lock_two_nondirectories(target_inode, src_inode);
1153 len = src_inode->i_size - off;
1155 cifs_dbg(FYI, "about to flush pages\n");
1156 /* should we flush first and last page first */
1157 truncate_inode_pages_range(&target_inode->i_data, destoff,
1158 PAGE_ALIGN(destoff + len)-1);
1160 if (target_tcon->ses->server->ops->duplicate_extents)
1161 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1162 smb_file_src, smb_file_target, off, len, destoff);
1166 /* force revalidate of size and timestamps of target file now
1167 that target is updated on the server */
1168 CIFS_I(target_inode)->time = 0;
1169 /* although unlocking in the reverse order from locking is not
1170 strictly necessary here it is a little cleaner to be consistent */
1171 unlock_two_nondirectories(src_inode, target_inode);
1174 return rc < 0 ? rc : len;
1177 ssize_t cifs_file_copychunk_range(unsigned int xid,
1178 struct file *src_file, loff_t off,
1179 struct file *dst_file, loff_t destoff,
1180 size_t len, unsigned int flags)
1182 struct inode *src_inode = file_inode(src_file);
1183 struct inode *target_inode = file_inode(dst_file);
1184 struct cifsFileInfo *smb_file_src;
1185 struct cifsFileInfo *smb_file_target;
1186 struct cifs_tcon *src_tcon;
1187 struct cifs_tcon *target_tcon;
1190 cifs_dbg(FYI, "copychunk range\n");
1192 if (!src_file->private_data || !dst_file->private_data) {
1194 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1199 smb_file_target = dst_file->private_data;
1200 smb_file_src = src_file->private_data;
1201 src_tcon = tlink_tcon(smb_file_src->tlink);
1202 target_tcon = tlink_tcon(smb_file_target->tlink);
1204 if (src_tcon->ses != target_tcon->ses) {
1205 cifs_dbg(VFS, "source and target of copy not on same server\n");
1210 if (!target_tcon->ses->server->ops->copychunk_range)
1214 * Note: cifs case is easier than btrfs since server responsible for
1215 * checks for proper open modes and file type and if it wants
1216 * server could even support copy of range where source = target
1218 lock_two_nondirectories(target_inode, src_inode);
1220 cifs_dbg(FYI, "about to flush pages\n");
1221 /* should we flush first and last page first */
1222 truncate_inode_pages(&target_inode->i_data, 0);
1224 rc = file_modified(dst_file);
1226 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1227 smb_file_src, smb_file_target, off, len, destoff);
1229 file_accessed(src_file);
1231 /* force revalidate of size and timestamps of target file now
1232 * that target is updated on the server
1234 CIFS_I(target_inode)->time = 0;
1235 /* although unlocking in the reverse order from locking is not
1236 * strictly necessary here it is a little cleaner to be consistent
1238 unlock_two_nondirectories(src_inode, target_inode);
1245 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1246 * is a dummy operation.
1248 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1250 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1256 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1257 struct file *dst_file, loff_t destoff,
1258 size_t len, unsigned int flags)
1260 unsigned int xid = get_xid();
1262 struct cifsFileInfo *cfile = dst_file->private_data;
1264 if (cfile->swapfile)
1267 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1271 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1272 rc = generic_copy_file_range(src_file, off, dst_file,
1273 destoff, len, flags);
1277 const struct file_operations cifs_file_ops = {
1278 .read_iter = cifs_loose_read_iter,
1279 .write_iter = cifs_file_write_iter,
1281 .release = cifs_close,
1283 .flock = cifs_flock,
1284 .fsync = cifs_fsync,
1285 .flush = cifs_flush,
1286 .mmap = cifs_file_mmap,
1287 .splice_read = generic_file_splice_read,
1288 .splice_write = iter_file_splice_write,
1289 .llseek = cifs_llseek,
1290 .unlocked_ioctl = cifs_ioctl,
1291 .copy_file_range = cifs_copy_file_range,
1292 .remap_file_range = cifs_remap_file_range,
1293 .setlease = cifs_setlease,
1294 .fallocate = cifs_fallocate,
1297 const struct file_operations cifs_file_strict_ops = {
1298 .read_iter = cifs_strict_readv,
1299 .write_iter = cifs_strict_writev,
1301 .release = cifs_close,
1303 .flock = cifs_flock,
1304 .fsync = cifs_strict_fsync,
1305 .flush = cifs_flush,
1306 .mmap = cifs_file_strict_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_direct_ops = {
1318 .read_iter = cifs_direct_readv,
1319 .write_iter = cifs_direct_writev,
1321 .release = cifs_close,
1323 .flock = cifs_flock,
1324 .fsync = cifs_fsync,
1325 .flush = cifs_flush,
1326 .mmap = cifs_file_mmap,
1327 .splice_read = generic_file_splice_read,
1328 .splice_write = iter_file_splice_write,
1329 .unlocked_ioctl = cifs_ioctl,
1330 .copy_file_range = cifs_copy_file_range,
1331 .remap_file_range = cifs_remap_file_range,
1332 .llseek = cifs_llseek,
1333 .setlease = cifs_setlease,
1334 .fallocate = cifs_fallocate,
1337 const struct file_operations cifs_file_nobrl_ops = {
1338 .read_iter = cifs_loose_read_iter,
1339 .write_iter = cifs_file_write_iter,
1341 .release = cifs_close,
1342 .fsync = cifs_fsync,
1343 .flush = cifs_flush,
1344 .mmap = cifs_file_mmap,
1345 .splice_read = generic_file_splice_read,
1346 .splice_write = iter_file_splice_write,
1347 .llseek = cifs_llseek,
1348 .unlocked_ioctl = cifs_ioctl,
1349 .copy_file_range = cifs_copy_file_range,
1350 .remap_file_range = cifs_remap_file_range,
1351 .setlease = cifs_setlease,
1352 .fallocate = cifs_fallocate,
1355 const struct file_operations cifs_file_strict_nobrl_ops = {
1356 .read_iter = cifs_strict_readv,
1357 .write_iter = cifs_strict_writev,
1359 .release = cifs_close,
1360 .fsync = cifs_strict_fsync,
1361 .flush = cifs_flush,
1362 .mmap = cifs_file_strict_mmap,
1363 .splice_read = generic_file_splice_read,
1364 .splice_write = iter_file_splice_write,
1365 .llseek = cifs_llseek,
1366 .unlocked_ioctl = cifs_ioctl,
1367 .copy_file_range = cifs_copy_file_range,
1368 .remap_file_range = cifs_remap_file_range,
1369 .setlease = cifs_setlease,
1370 .fallocate = cifs_fallocate,
1373 const struct file_operations cifs_file_direct_nobrl_ops = {
1374 .read_iter = cifs_direct_readv,
1375 .write_iter = cifs_direct_writev,
1377 .release = cifs_close,
1378 .fsync = cifs_fsync,
1379 .flush = cifs_flush,
1380 .mmap = cifs_file_mmap,
1381 .splice_read = generic_file_splice_read,
1382 .splice_write = iter_file_splice_write,
1383 .unlocked_ioctl = cifs_ioctl,
1384 .copy_file_range = cifs_copy_file_range,
1385 .remap_file_range = cifs_remap_file_range,
1386 .llseek = cifs_llseek,
1387 .setlease = cifs_setlease,
1388 .fallocate = cifs_fallocate,
1391 const struct file_operations cifs_dir_ops = {
1392 .iterate_shared = cifs_readdir,
1393 .release = cifs_closedir,
1394 .read = generic_read_dir,
1395 .unlocked_ioctl = cifs_ioctl,
1396 .copy_file_range = cifs_copy_file_range,
1397 .remap_file_range = cifs_remap_file_range,
1398 .llseek = generic_file_llseek,
1399 .fsync = cifs_dir_fsync,
1403 cifs_init_once(void *inode)
1405 struct cifsInodeInfo *cifsi = inode;
1407 inode_init_once(&cifsi->vfs_inode);
1408 init_rwsem(&cifsi->lock_sem);
1412 cifs_init_inodecache(void)
1414 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1415 sizeof(struct cifsInodeInfo),
1416 0, (SLAB_RECLAIM_ACCOUNT|
1417 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1419 if (cifs_inode_cachep == NULL)
1426 cifs_destroy_inodecache(void)
1429 * Make sure all delayed rcu free inodes are flushed before we
1433 kmem_cache_destroy(cifs_inode_cachep);
1437 cifs_init_request_bufs(void)
1440 * SMB2 maximum header size is bigger than CIFS one - no problems to
1441 * allocate some more bytes for CIFS.
1443 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1445 if (CIFSMaxBufSize < 8192) {
1446 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1447 Unicode path name has to fit in any SMB/CIFS path based frames */
1448 CIFSMaxBufSize = 8192;
1449 } else if (CIFSMaxBufSize > 1024*127) {
1450 CIFSMaxBufSize = 1024 * 127;
1452 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1455 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1456 CIFSMaxBufSize, CIFSMaxBufSize);
1458 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1459 CIFSMaxBufSize + max_hdr_size, 0,
1460 SLAB_HWCACHE_ALIGN, 0,
1461 CIFSMaxBufSize + max_hdr_size,
1463 if (cifs_req_cachep == NULL)
1466 if (cifs_min_rcv < 1)
1468 else if (cifs_min_rcv > 64) {
1470 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1473 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1476 if (cifs_req_poolp == NULL) {
1477 kmem_cache_destroy(cifs_req_cachep);
1480 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1481 almost all handle based requests (but not write response, nor is it
1482 sufficient for path based requests). A smaller size would have
1483 been more efficient (compacting multiple slab items on one 4k page)
1484 for the case in which debug was on, but this larger size allows
1485 more SMBs to use small buffer alloc and is still much more
1486 efficient to alloc 1 per page off the slab compared to 17K (5page)
1487 alloc of large cifs buffers even when page debugging is on */
1488 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1489 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1490 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1491 if (cifs_sm_req_cachep == NULL) {
1492 mempool_destroy(cifs_req_poolp);
1493 kmem_cache_destroy(cifs_req_cachep);
1497 if (cifs_min_small < 2)
1499 else if (cifs_min_small > 256) {
1500 cifs_min_small = 256;
1501 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1504 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1505 cifs_sm_req_cachep);
1507 if (cifs_sm_req_poolp == NULL) {
1508 mempool_destroy(cifs_req_poolp);
1509 kmem_cache_destroy(cifs_req_cachep);
1510 kmem_cache_destroy(cifs_sm_req_cachep);
1518 cifs_destroy_request_bufs(void)
1520 mempool_destroy(cifs_req_poolp);
1521 kmem_cache_destroy(cifs_req_cachep);
1522 mempool_destroy(cifs_sm_req_poolp);
1523 kmem_cache_destroy(cifs_sm_req_cachep);
1527 cifs_init_mids(void)
1529 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1530 sizeof(struct mid_q_entry), 0,
1531 SLAB_HWCACHE_ALIGN, NULL);
1532 if (cifs_mid_cachep == NULL)
1535 /* 3 is a reasonable minimum number of simultaneous operations */
1536 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1537 if (cifs_mid_poolp == NULL) {
1538 kmem_cache_destroy(cifs_mid_cachep);
1546 cifs_destroy_mids(void)
1548 mempool_destroy(cifs_mid_poolp);
1549 kmem_cache_destroy(cifs_mid_cachep);
1557 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1559 * Initialize Global counters
1561 atomic_set(&sesInfoAllocCount, 0);
1562 atomic_set(&tconInfoAllocCount, 0);
1563 atomic_set(&tcpSesNextId, 0);
1564 atomic_set(&tcpSesAllocCount, 0);
1565 atomic_set(&tcpSesReconnectCount, 0);
1566 atomic_set(&tconInfoReconnectCount, 0);
1568 atomic_set(&bufAllocCount, 0);
1569 atomic_set(&smBufAllocCount, 0);
1570 #ifdef CONFIG_CIFS_STATS2
1571 atomic_set(&totBufAllocCount, 0);
1572 atomic_set(&totSmBufAllocCount, 0);
1573 if (slow_rsp_threshold < 1)
1574 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1575 else if (slow_rsp_threshold > 32767)
1577 "slow response threshold set higher than recommended (0 to 32767)\n");
1578 #endif /* CONFIG_CIFS_STATS2 */
1580 atomic_set(&midCount, 0);
1581 GlobalCurrentXid = 0;
1582 GlobalTotalActiveXid = 0;
1583 GlobalMaxActiveXid = 0;
1584 spin_lock_init(&cifs_tcp_ses_lock);
1585 spin_lock_init(&GlobalMid_Lock);
1587 cifs_lock_secret = get_random_u32();
1589 if (cifs_max_pending < 2) {
1590 cifs_max_pending = 2;
1591 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1592 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1593 cifs_max_pending = CIFS_MAX_REQ;
1594 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1598 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1601 goto out_clean_proc;
1605 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1606 * so that we don't launch too many worker threads but
1607 * Documentation/core-api/workqueue.rst recommends setting it to 0
1610 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1611 decrypt_wq = alloc_workqueue("smb3decryptd",
1612 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1615 goto out_destroy_cifsiod_wq;
1618 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1619 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1620 if (!fileinfo_put_wq) {
1622 goto out_destroy_decrypt_wq;
1625 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1626 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1627 if (!cifsoplockd_wq) {
1629 goto out_destroy_fileinfo_put_wq;
1632 deferredclose_wq = alloc_workqueue("deferredclose",
1633 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1634 if (!deferredclose_wq) {
1636 goto out_destroy_cifsoplockd_wq;
1639 rc = cifs_init_inodecache();
1641 goto out_destroy_deferredclose_wq;
1643 rc = cifs_init_mids();
1645 goto out_destroy_inodecache;
1647 rc = cifs_init_request_bufs();
1649 goto out_destroy_mids;
1651 #ifdef CONFIG_CIFS_DFS_UPCALL
1652 rc = dfs_cache_init();
1654 goto out_destroy_request_bufs;
1655 #endif /* CONFIG_CIFS_DFS_UPCALL */
1656 #ifdef CONFIG_CIFS_UPCALL
1657 rc = init_cifs_spnego();
1659 goto out_destroy_dfs_cache;
1660 #endif /* CONFIG_CIFS_UPCALL */
1661 #ifdef CONFIG_CIFS_SWN_UPCALL
1662 rc = cifs_genl_init();
1664 goto out_register_key_type;
1665 #endif /* CONFIG_CIFS_SWN_UPCALL */
1667 rc = init_cifs_idmap();
1669 goto out_cifs_swn_init;
1671 rc = register_filesystem(&cifs_fs_type);
1673 goto out_init_cifs_idmap;
1675 rc = register_filesystem(&smb3_fs_type);
1677 unregister_filesystem(&cifs_fs_type);
1678 goto out_init_cifs_idmap;
1683 out_init_cifs_idmap:
1686 #ifdef CONFIG_CIFS_SWN_UPCALL
1688 out_register_key_type:
1690 #ifdef CONFIG_CIFS_UPCALL
1692 out_destroy_dfs_cache:
1694 #ifdef CONFIG_CIFS_DFS_UPCALL
1695 dfs_cache_destroy();
1696 out_destroy_request_bufs:
1698 cifs_destroy_request_bufs();
1700 cifs_destroy_mids();
1701 out_destroy_inodecache:
1702 cifs_destroy_inodecache();
1703 out_destroy_deferredclose_wq:
1704 destroy_workqueue(deferredclose_wq);
1705 out_destroy_cifsoplockd_wq:
1706 destroy_workqueue(cifsoplockd_wq);
1707 out_destroy_fileinfo_put_wq:
1708 destroy_workqueue(fileinfo_put_wq);
1709 out_destroy_decrypt_wq:
1710 destroy_workqueue(decrypt_wq);
1711 out_destroy_cifsiod_wq:
1712 destroy_workqueue(cifsiod_wq);
1721 cifs_dbg(NOISY, "exit_smb3\n");
1722 unregister_filesystem(&cifs_fs_type);
1723 unregister_filesystem(&smb3_fs_type);
1724 cifs_dfs_release_automount_timer();
1726 #ifdef CONFIG_CIFS_SWN_UPCALL
1729 #ifdef CONFIG_CIFS_UPCALL
1732 #ifdef CONFIG_CIFS_DFS_UPCALL
1733 dfs_cache_destroy();
1735 cifs_destroy_request_bufs();
1736 cifs_destroy_mids();
1737 cifs_destroy_inodecache();
1738 destroy_workqueue(deferredclose_wq);
1739 destroy_workqueue(cifsoplockd_wq);
1740 destroy_workqueue(decrypt_wq);
1741 destroy_workqueue(fileinfo_put_wq);
1742 destroy_workqueue(cifsiod_wq);
1746 MODULE_AUTHOR("Steve French");
1747 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1749 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1750 "also older servers complying with the SNIA CIFS Specification)");
1751 MODULE_VERSION(CIFS_VERSION);
1752 MODULE_SOFTDEP("ecb");
1753 MODULE_SOFTDEP("hmac");
1754 MODULE_SOFTDEP("md5");
1755 MODULE_SOFTDEP("nls");
1756 MODULE_SOFTDEP("aes");
1757 MODULE_SOFTDEP("cmac");
1758 MODULE_SOFTDEP("sha256");
1759 MODULE_SOFTDEP("sha512");
1760 MODULE_SOFTDEP("aead2");
1761 MODULE_SOFTDEP("ccm");
1762 MODULE_SOFTDEP("gcm");
1763 module_init(init_cifs)
1764 module_exit(exit_cifs)