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;
72 atomic_t buf_alloc_count;
73 atomic_t small_buf_alloc_count;
74 #ifdef CONFIG_CIFS_STATS2
75 atomic_t total_buf_alloc_count;
76 atomic_t total_small_buf_alloc_count;
78 static const struct super_operations cifs_super_ops;
79 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
80 module_param(CIFSMaxBufSize, uint, 0444);
81 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
83 "Default: 16384 Range: 8192 to 130048");
84 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
85 module_param(cifs_min_rcv, uint, 0444);
86 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
88 unsigned int cifs_min_small = 30;
89 module_param(cifs_min_small, uint, 0444);
90 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
92 unsigned int cifs_max_pending = CIFS_MAX_REQ;
93 module_param(cifs_max_pending, uint, 0444);
94 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
95 "CIFS/SMB1 dialect (N/A for SMB3) "
96 "Default: 32767 Range: 2 to 32767.");
97 #ifdef CONFIG_CIFS_STATS2
98 unsigned int slow_rsp_threshold = 1;
99 module_param(slow_rsp_threshold, uint, 0644);
100 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
101 "before logging that a response is delayed. "
102 "Default: 1 (if set to 0 disables msg).");
105 module_param(enable_oplocks, bool, 0644);
106 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
108 module_param(enable_gcm_256, bool, 0644);
109 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
111 module_param(require_gcm_256, bool, 0644);
112 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
114 module_param(enable_negotiate_signing, bool, 0644);
115 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
117 module_param(disable_legacy_dialects, bool, 0644);
118 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
119 "helpful to restrict the ability to "
120 "override the default dialects (SMB2.1, "
121 "SMB3 and SMB3.02) on mount with old "
122 "dialects (CIFS/SMB1 and SMB2) since "
123 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
124 " and less secure. Default: n/N/0");
126 extern mempool_t *cifs_sm_req_poolp;
127 extern mempool_t *cifs_req_poolp;
128 extern mempool_t *cifs_mid_poolp;
130 struct workqueue_struct *cifsiod_wq;
131 struct workqueue_struct *decrypt_wq;
132 struct workqueue_struct *fileinfo_put_wq;
133 struct workqueue_struct *cifsoplockd_wq;
134 struct workqueue_struct *deferredclose_wq;
135 __u32 cifs_lock_secret;
138 * Bumps refcount for cifs super block.
139 * Note that it should be only called if a referece to VFS super block is
140 * already held, e.g. in open-type syscalls context. Otherwise it can race with
141 * atomic_dec_and_test in deactivate_locked_super.
144 cifs_sb_active(struct super_block *sb)
146 struct cifs_sb_info *server = CIFS_SB(sb);
148 if (atomic_inc_return(&server->active) == 1)
149 atomic_inc(&sb->s_active);
153 cifs_sb_deactive(struct super_block *sb)
155 struct cifs_sb_info *server = CIFS_SB(sb);
157 if (atomic_dec_and_test(&server->active))
158 deactivate_super(sb);
162 cifs_read_super(struct super_block *sb)
165 struct cifs_sb_info *cifs_sb;
166 struct cifs_tcon *tcon;
167 struct timespec64 ts;
170 cifs_sb = CIFS_SB(sb);
171 tcon = cifs_sb_master_tcon(cifs_sb);
173 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
174 sb->s_flags |= SB_POSIXACL;
176 if (tcon->snapshot_time)
177 sb->s_flags |= SB_RDONLY;
179 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
180 sb->s_maxbytes = MAX_LFS_FILESIZE;
182 sb->s_maxbytes = MAX_NON_LFS;
185 * Some very old servers like DOS and OS/2 used 2 second granularity
186 * (while all current servers use 100ns granularity - see MS-DTYP)
187 * but 1 second is the maximum allowed granularity for the VFS
188 * so for old servers set time granularity to 1 second while for
189 * everything else (current servers) set it to 100ns.
191 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
192 ((tcon->ses->capabilities &
193 tcon->ses->server->vals->cap_nt_find) == 0) &&
195 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
196 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
197 sb->s_time_min = ts.tv_sec;
198 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
199 cpu_to_le16(SMB_TIME_MAX), 0);
200 sb->s_time_max = ts.tv_sec;
203 * Almost every server, including all SMB2+, uses DCE TIME
204 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
206 sb->s_time_gran = 100;
207 ts = cifs_NTtimeToUnix(0);
208 sb->s_time_min = ts.tv_sec;
209 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
210 sb->s_time_max = ts.tv_sec;
213 sb->s_magic = CIFS_SUPER_MAGIC;
214 sb->s_op = &cifs_super_ops;
215 sb->s_xattr = cifs_xattr_handlers;
216 rc = super_setup_bdi(sb);
219 /* tune readahead according to rsize if readahead size not set on mount */
220 if (cifs_sb->ctx->rsize == 0)
221 cifs_sb->ctx->rsize =
222 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
223 if (cifs_sb->ctx->rasize)
224 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
226 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
228 sb->s_blocksize = CIFS_MAX_MSGSIZE;
229 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
230 inode = cifs_root_iget(sb);
238 sb->s_d_op = &cifs_ci_dentry_ops;
240 sb->s_d_op = &cifs_dentry_ops;
242 sb->s_root = d_make_root(inode);
248 #ifdef CONFIG_CIFS_NFSD_EXPORT
249 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
250 cifs_dbg(FYI, "export ops supported\n");
251 sb->s_export_op = &cifs_export_ops;
253 #endif /* CONFIG_CIFS_NFSD_EXPORT */
258 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
262 static void cifs_kill_sb(struct super_block *sb)
264 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
265 struct cifs_tcon *tcon;
266 struct cached_fid *cfid;
267 struct rb_root *root = &cifs_sb->tlink_tree;
268 struct rb_node *node;
269 struct tcon_link *tlink;
272 * We ned to release all dentries for the cached directories
273 * before we kill the sb.
276 for (node = rb_first(root); node; node = rb_next(node)) {
277 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
278 tcon = tlink_tcon(tlink);
282 mutex_lock(&cfid->fid_mutex);
287 mutex_unlock(&cfid->fid_mutex);
290 /* finally release root dentry */
292 cifs_sb->root = NULL;
296 cifs_umount(cifs_sb);
300 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
302 struct super_block *sb = dentry->d_sb;
303 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
304 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
305 struct TCP_Server_Info *server = tcon->ses->server;
311 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
313 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
315 buf->f_namelen = PATH_MAX;
317 buf->f_fsid.val[0] = tcon->vol_serial_number;
318 /* are using part of create time for more randomness, see man statfs */
319 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
321 buf->f_files = 0; /* undefined */
322 buf->f_ffree = 0; /* unlimited */
324 if (server->ops->queryfs)
325 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
331 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
333 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
334 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
335 struct TCP_Server_Info *server = tcon->ses->server;
337 if (server->ops->fallocate)
338 return server->ops->fallocate(file, tcon, mode, off, len);
343 static int cifs_permission(struct user_namespace *mnt_userns,
344 struct inode *inode, int mask)
346 struct cifs_sb_info *cifs_sb;
348 cifs_sb = CIFS_SB(inode->i_sb);
350 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
351 if ((mask & MAY_EXEC) && !execute_ok(inode))
355 } else /* file mode might have been restricted at mount time
356 on the client (above and beyond ACL on servers) for
357 servers which do not support setting and viewing mode bits,
358 so allowing client to check permissions is useful */
359 return generic_permission(&init_user_ns, inode, mask);
362 static struct kmem_cache *cifs_inode_cachep;
363 static struct kmem_cache *cifs_req_cachep;
364 static struct kmem_cache *cifs_mid_cachep;
365 static struct kmem_cache *cifs_sm_req_cachep;
366 mempool_t *cifs_sm_req_poolp;
367 mempool_t *cifs_req_poolp;
368 mempool_t *cifs_mid_poolp;
370 static struct inode *
371 cifs_alloc_inode(struct super_block *sb)
373 struct cifsInodeInfo *cifs_inode;
374 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
377 cifs_inode->cifsAttrs = 0x20; /* default */
378 cifs_inode->time = 0;
380 * Until the file is open and we have gotten oplock info back from the
381 * server, can not assume caching of file data or metadata.
383 cifs_set_oplock_level(cifs_inode, 0);
384 cifs_inode->flags = 0;
385 spin_lock_init(&cifs_inode->writers_lock);
386 cifs_inode->writers = 0;
387 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
388 cifs_inode->server_eof = 0;
389 cifs_inode->uniqueid = 0;
390 cifs_inode->createtime = 0;
391 cifs_inode->epoch = 0;
392 spin_lock_init(&cifs_inode->open_file_lock);
393 generate_random_uuid(cifs_inode->lease_key);
396 * Can not set i_flags here - they get immediately overwritten to zero
399 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
400 INIT_LIST_HEAD(&cifs_inode->openFileList);
401 INIT_LIST_HEAD(&cifs_inode->llist);
402 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
403 spin_lock_init(&cifs_inode->deferred_lock);
404 return &cifs_inode->vfs_inode;
408 cifs_free_inode(struct inode *inode)
410 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
414 cifs_evict_inode(struct inode *inode)
416 truncate_inode_pages_final(&inode->i_data);
421 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
423 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
424 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
426 seq_puts(s, ",addr=");
428 switch (server->dstaddr.ss_family) {
430 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
433 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
434 if (sa6->sin6_scope_id)
435 seq_printf(s, "%%%u", sa6->sin6_scope_id);
438 seq_puts(s, "(unknown)");
441 seq_puts(s, ",rdma");
445 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
447 if (ses->sectype == Unspecified) {
448 if (ses->user_name == NULL)
449 seq_puts(s, ",sec=none");
453 seq_puts(s, ",sec=");
455 switch (ses->sectype) {
457 seq_puts(s, "ntlmv2");
463 seq_puts(s, "ntlmssp");
466 /* shouldn't ever happen */
467 seq_puts(s, "unknown");
474 if (ses->sectype == Kerberos)
475 seq_printf(s, ",cruid=%u",
476 from_kuid_munged(&init_user_ns, ses->cred_uid));
480 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
482 seq_puts(s, ",cache=");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
485 seq_puts(s, "strict");
486 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
488 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
489 seq_puts(s, "singleclient"); /* assume only one client access */
490 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
491 seq_puts(s, "ro"); /* read only caching assumed */
493 seq_puts(s, "loose");
497 * cifs_show_devname() is used so we show the mount device name with correct
498 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
500 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
502 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
503 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
508 convert_delimiter(devname, '/');
509 /* escape all spaces in share names */
510 seq_escape(m, devname, " \t");
517 * cifs_show_options() is for displaying mount options in /proc/mounts.
518 * Not all settable options are displayed but most of the important
522 cifs_show_options(struct seq_file *s, struct dentry *root)
524 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
525 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
526 struct sockaddr *srcaddr;
527 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
529 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
530 cifs_show_security(s, tcon->ses);
531 cifs_show_cache_flavor(s, cifs_sb);
534 seq_puts(s, ",nolease");
535 if (cifs_sb->ctx->multiuser)
536 seq_puts(s, ",multiuser");
537 else if (tcon->ses->user_name)
538 seq_show_option(s, "username", tcon->ses->user_name);
540 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
541 seq_show_option(s, "domain", tcon->ses->domainName);
543 if (srcaddr->sa_family != AF_UNSPEC) {
544 struct sockaddr_in *saddr4;
545 struct sockaddr_in6 *saddr6;
546 saddr4 = (struct sockaddr_in *)srcaddr;
547 saddr6 = (struct sockaddr_in6 *)srcaddr;
548 if (srcaddr->sa_family == AF_INET6)
549 seq_printf(s, ",srcaddr=%pI6c",
551 else if (srcaddr->sa_family == AF_INET)
552 seq_printf(s, ",srcaddr=%pI4",
553 &saddr4->sin_addr.s_addr);
555 seq_printf(s, ",srcaddr=BAD-AF:%i",
556 (int)(srcaddr->sa_family));
559 seq_printf(s, ",uid=%u",
560 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
561 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
562 seq_puts(s, ",forceuid");
564 seq_puts(s, ",noforceuid");
566 seq_printf(s, ",gid=%u",
567 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
568 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
569 seq_puts(s, ",forcegid");
571 seq_puts(s, ",noforcegid");
573 cifs_show_address(s, tcon->ses->server);
576 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
577 cifs_sb->ctx->file_mode,
578 cifs_sb->ctx->dir_mode);
579 if (cifs_sb->ctx->iocharset)
580 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
582 seq_puts(s, ",seal");
583 else if (tcon->ses->server->ignore_signature)
584 seq_puts(s, ",signloosely");
586 seq_puts(s, ",nocase");
588 seq_puts(s, ",nodelete");
589 if (cifs_sb->ctx->no_sparse)
590 seq_puts(s, ",nosparse");
591 if (tcon->local_lease)
592 seq_puts(s, ",locallease");
594 seq_puts(s, ",hard");
596 seq_puts(s, ",soft");
597 if (tcon->use_persistent)
598 seq_puts(s, ",persistenthandles");
599 else if (tcon->use_resilient)
600 seq_puts(s, ",resilienthandles");
601 if (tcon->posix_extensions)
602 seq_puts(s, ",posix");
603 else if (tcon->unix_ext)
604 seq_puts(s, ",unix");
606 seq_puts(s, ",nounix");
607 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
608 seq_puts(s, ",nodfs");
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
610 seq_puts(s, ",posixpaths");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
612 seq_puts(s, ",setuids");
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
614 seq_puts(s, ",idsfromsid");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
616 seq_puts(s, ",serverino");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
618 seq_puts(s, ",rwpidforward");
619 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
620 seq_puts(s, ",forcemand");
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
622 seq_puts(s, ",nouser_xattr");
623 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
624 seq_puts(s, ",mapchars");
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
626 seq_puts(s, ",mapposix");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
630 seq_puts(s, ",nobrl");
631 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
632 seq_puts(s, ",nohandlecache");
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
634 seq_puts(s, ",modefromsid");
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
636 seq_puts(s, ",cifsacl");
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
638 seq_puts(s, ",dynperm");
639 if (root->d_sb->s_flags & SB_POSIXACL)
641 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
642 seq_puts(s, ",mfsymlinks");
643 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
645 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
646 seq_puts(s, ",nostrictsync");
647 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
648 seq_puts(s, ",noperm");
649 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
650 seq_printf(s, ",backupuid=%u",
651 from_kuid_munged(&init_user_ns,
652 cifs_sb->ctx->backupuid));
653 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
654 seq_printf(s, ",backupgid=%u",
655 from_kgid_munged(&init_user_ns,
656 cifs_sb->ctx->backupgid));
658 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
659 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
660 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
661 if (cifs_sb->ctx->rasize)
662 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
663 if (tcon->ses->server->min_offload)
664 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
665 seq_printf(s, ",echo_interval=%lu",
666 tcon->ses->server->echo_interval / HZ);
668 /* Only display max_credits if it was overridden on mount */
669 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
670 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
672 if (tcon->snapshot_time)
673 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
674 if (tcon->handle_timeout)
675 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
678 * Display file and directory attribute timeout in seconds.
679 * If file and directory attribute timeout the same then actimeo
680 * was likely specified on mount
682 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
683 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
685 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
686 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
689 if (tcon->ses->chan_max > 1)
690 seq_printf(s, ",multichannel,max_channels=%zu",
691 tcon->ses->chan_max);
693 if (tcon->use_witness)
694 seq_puts(s, ",witness");
699 static void cifs_umount_begin(struct super_block *sb)
701 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
702 struct cifs_tcon *tcon;
707 tcon = cifs_sb_master_tcon(cifs_sb);
709 spin_lock(&cifs_tcp_ses_lock);
710 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
711 /* we have other mounts to same share or we have
712 already tried to force umount this and woken up
713 all waiting network requests, nothing to do */
714 spin_unlock(&cifs_tcp_ses_lock);
716 } else if (tcon->tc_count == 1)
717 tcon->status = TID_EXITING;
718 spin_unlock(&cifs_tcp_ses_lock);
720 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
721 /* cancel_notify_requests(tcon); */
722 if (tcon->ses && tcon->ses->server) {
723 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
724 wake_up_all(&tcon->ses->server->request_q);
725 wake_up_all(&tcon->ses->server->response_q);
726 msleep(1); /* yield */
727 /* we have to kick the requests once more */
728 wake_up_all(&tcon->ses->server->response_q);
735 #ifdef CONFIG_CIFS_STATS2
736 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
743 static int cifs_drop_inode(struct inode *inode)
745 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
747 /* no serverino => unconditional eviction */
748 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
749 generic_drop_inode(inode);
752 static const struct super_operations cifs_super_ops = {
753 .statfs = cifs_statfs,
754 .alloc_inode = cifs_alloc_inode,
755 .free_inode = cifs_free_inode,
756 .drop_inode = cifs_drop_inode,
757 .evict_inode = cifs_evict_inode,
758 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
759 .show_devname = cifs_show_devname,
760 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
761 function unless later we add lazy close of inodes or unless the
762 kernel forgets to call us with the same number of releases (closes)
764 .show_options = cifs_show_options,
765 .umount_begin = cifs_umount_begin,
766 #ifdef CONFIG_CIFS_STATS2
767 .show_stats = cifs_show_stats,
772 * Get root dentry from superblock according to prefix path mount option.
773 * Return dentry with refcount + 1 on success and NULL otherwise.
775 static struct dentry *
776 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
778 struct dentry *dentry;
779 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
780 char *full_path = NULL;
784 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
785 return dget(sb->s_root);
787 full_path = cifs_build_path_to_root(ctx, cifs_sb,
788 cifs_sb_master_tcon(cifs_sb), 0);
789 if (full_path == NULL)
790 return ERR_PTR(-ENOMEM);
792 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
794 sep = CIFS_DIR_SEP(cifs_sb);
795 dentry = dget(sb->s_root);
799 struct inode *dir = d_inode(dentry);
800 struct dentry *child;
802 if (!S_ISDIR(dir->i_mode)) {
804 dentry = ERR_PTR(-ENOTDIR);
808 /* skip separators */
815 while (*s && *s != sep)
818 child = lookup_positive_unlocked(p, dentry, s - p);
821 } while (!IS_ERR(dentry));
826 static int cifs_set_super(struct super_block *sb, void *data)
828 struct cifs_mnt_data *mnt_data = data;
829 sb->s_fs_info = mnt_data->cifs_sb;
830 return set_anon_super(sb, NULL);
834 cifs_smb3_do_mount(struct file_system_type *fs_type,
835 int flags, struct smb3_fs_context *old_ctx)
838 struct super_block *sb = NULL;
839 struct cifs_sb_info *cifs_sb = NULL;
840 struct cifs_mnt_data mnt_data;
844 * Prints in Kernel / CIFS log the attempted mount operation
845 * If CIFS_DEBUG && cifs_FYI
848 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
850 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
852 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
853 if (cifs_sb == NULL) {
854 root = ERR_PTR(-ENOMEM);
858 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
860 root = ERR_PTR(-ENOMEM);
863 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
869 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
875 rc = cifs_setup_cifs_sb(cifs_sb);
881 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
883 if (!(flags & SB_SILENT))
884 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
890 mnt_data.ctx = cifs_sb->ctx;
891 mnt_data.cifs_sb = cifs_sb;
892 mnt_data.flags = flags;
894 /* BB should we make this contingent on mount parm? */
895 flags |= SB_NODIRATIME | SB_NOATIME;
897 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
900 cifs_umount(cifs_sb);
906 cifs_dbg(FYI, "Use existing superblock\n");
907 cifs_umount(cifs_sb);
910 rc = cifs_read_super(sb);
916 sb->s_flags |= SB_ACTIVE;
919 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
924 cifs_sb->root = dget(root);
926 cifs_dbg(FYI, "dentry root is: %p\n", root);
930 deactivate_locked_super(sb);
934 if (!sb || IS_ERR(sb)) { /* otherwise kill_sb will handle */
935 kfree(cifs_sb->prepath);
936 smb3_cleanup_fs_context(cifs_sb->ctx);
945 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
948 struct inode *inode = file_inode(iocb->ki_filp);
950 if (iocb->ki_flags & IOCB_DIRECT)
951 return cifs_user_readv(iocb, iter);
953 rc = cifs_revalidate_mapping(inode);
957 return generic_file_read_iter(iocb, iter);
960 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
962 struct inode *inode = file_inode(iocb->ki_filp);
963 struct cifsInodeInfo *cinode = CIFS_I(inode);
967 if (iocb->ki_filp->f_flags & O_DIRECT) {
968 written = cifs_user_writev(iocb, from);
969 if (written > 0 && CIFS_CACHE_READ(cinode)) {
970 cifs_zap_mapping(inode);
972 "Set no oplock for inode=%p after a write operation\n",
979 written = cifs_get_writer(cinode);
983 written = generic_file_write_iter(iocb, from);
985 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
988 rc = filemap_fdatawrite(inode->i_mapping);
990 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
994 cifs_put_writer(cinode);
998 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1000 struct cifsFileInfo *cfile = file->private_data;
1001 struct cifs_tcon *tcon;
1004 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1005 * the cached file length
1007 if (whence != SEEK_SET && whence != SEEK_CUR) {
1009 struct inode *inode = file_inode(file);
1012 * We need to be sure that all dirty pages are written and the
1013 * server has the newest file length.
1015 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1016 inode->i_mapping->nrpages != 0) {
1017 rc = filemap_fdatawait(inode->i_mapping);
1019 mapping_set_error(inode->i_mapping, rc);
1024 * Some applications poll for the file length in this strange
1025 * way so we must seek to end on non-oplocked files by
1026 * setting the revalidate time to zero.
1028 CIFS_I(inode)->time = 0;
1030 rc = cifs_revalidate_file_attr(file);
1034 if (cfile && cfile->tlink) {
1035 tcon = tlink_tcon(cfile->tlink);
1036 if (tcon->ses->server->ops->llseek)
1037 return tcon->ses->server->ops->llseek(file, tcon,
1040 return generic_file_llseek(file, offset, whence);
1044 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1047 * Note that this is called by vfs setlease with i_lock held to
1048 * protect *lease from going away.
1050 struct inode *inode = file_inode(file);
1051 struct cifsFileInfo *cfile = file->private_data;
1053 if (!(S_ISREG(inode->i_mode)))
1056 /* Check if file is oplocked if this is request for new lease */
1057 if (arg == F_UNLCK ||
1058 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1059 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1060 return generic_setlease(file, arg, lease, priv);
1061 else if (tlink_tcon(cfile->tlink)->local_lease &&
1062 !CIFS_CACHE_READ(CIFS_I(inode)))
1064 * If the server claims to support oplock on this file, then we
1065 * still need to check oplock even if the local_lease mount
1066 * option is set, but there are servers which do not support
1067 * oplock for which this mount option may be useful if the user
1068 * knows that the file won't be changed on the server by anyone
1071 return generic_setlease(file, arg, lease, priv);
1076 struct file_system_type cifs_fs_type = {
1077 .owner = THIS_MODULE,
1079 .init_fs_context = smb3_init_fs_context,
1080 .parameters = smb3_fs_parameters,
1081 .kill_sb = cifs_kill_sb,
1082 .fs_flags = FS_RENAME_DOES_D_MOVE,
1084 MODULE_ALIAS_FS("cifs");
1086 struct file_system_type smb3_fs_type = {
1087 .owner = THIS_MODULE,
1089 .init_fs_context = smb3_init_fs_context,
1090 .parameters = smb3_fs_parameters,
1091 .kill_sb = cifs_kill_sb,
1092 .fs_flags = FS_RENAME_DOES_D_MOVE,
1094 MODULE_ALIAS_FS("smb3");
1095 MODULE_ALIAS("smb3");
1097 const struct inode_operations cifs_dir_inode_ops = {
1098 .create = cifs_create,
1099 .atomic_open = cifs_atomic_open,
1100 .lookup = cifs_lookup,
1101 .getattr = cifs_getattr,
1102 .unlink = cifs_unlink,
1103 .link = cifs_hardlink,
1104 .mkdir = cifs_mkdir,
1105 .rmdir = cifs_rmdir,
1106 .rename = cifs_rename2,
1107 .permission = cifs_permission,
1108 .setattr = cifs_setattr,
1109 .symlink = cifs_symlink,
1110 .mknod = cifs_mknod,
1111 .listxattr = cifs_listxattr,
1114 const struct inode_operations cifs_file_inode_ops = {
1115 .setattr = cifs_setattr,
1116 .getattr = cifs_getattr,
1117 .permission = cifs_permission,
1118 .listxattr = cifs_listxattr,
1119 .fiemap = cifs_fiemap,
1122 const struct inode_operations cifs_symlink_inode_ops = {
1123 .get_link = cifs_get_link,
1124 .permission = cifs_permission,
1125 .listxattr = cifs_listxattr,
1128 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1129 struct file *dst_file, loff_t destoff, loff_t len,
1130 unsigned int remap_flags)
1132 struct inode *src_inode = file_inode(src_file);
1133 struct inode *target_inode = file_inode(dst_file);
1134 struct cifsFileInfo *smb_file_src = src_file->private_data;
1135 struct cifsFileInfo *smb_file_target;
1136 struct cifs_tcon *target_tcon;
1140 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1143 cifs_dbg(FYI, "clone range\n");
1147 if (!src_file->private_data || !dst_file->private_data) {
1149 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1153 smb_file_target = dst_file->private_data;
1154 target_tcon = tlink_tcon(smb_file_target->tlink);
1157 * Note: cifs case is easier than btrfs since server responsible for
1158 * checks for proper open modes and file type and if it wants
1159 * server could even support copy of range where source = target
1161 lock_two_nondirectories(target_inode, src_inode);
1164 len = src_inode->i_size - off;
1166 cifs_dbg(FYI, "about to flush pages\n");
1167 /* should we flush first and last page first */
1168 truncate_inode_pages_range(&target_inode->i_data, destoff,
1169 PAGE_ALIGN(destoff + len)-1);
1171 if (target_tcon->ses->server->ops->duplicate_extents)
1172 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1173 smb_file_src, smb_file_target, off, len, destoff);
1177 /* force revalidate of size and timestamps of target file now
1178 that target is updated on the server */
1179 CIFS_I(target_inode)->time = 0;
1180 /* although unlocking in the reverse order from locking is not
1181 strictly necessary here it is a little cleaner to be consistent */
1182 unlock_two_nondirectories(src_inode, target_inode);
1185 return rc < 0 ? rc : len;
1188 ssize_t cifs_file_copychunk_range(unsigned int xid,
1189 struct file *src_file, loff_t off,
1190 struct file *dst_file, loff_t destoff,
1191 size_t len, unsigned int flags)
1193 struct inode *src_inode = file_inode(src_file);
1194 struct inode *target_inode = file_inode(dst_file);
1195 struct cifsFileInfo *smb_file_src;
1196 struct cifsFileInfo *smb_file_target;
1197 struct cifs_tcon *src_tcon;
1198 struct cifs_tcon *target_tcon;
1201 cifs_dbg(FYI, "copychunk range\n");
1203 if (!src_file->private_data || !dst_file->private_data) {
1205 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1210 smb_file_target = dst_file->private_data;
1211 smb_file_src = src_file->private_data;
1212 src_tcon = tlink_tcon(smb_file_src->tlink);
1213 target_tcon = tlink_tcon(smb_file_target->tlink);
1215 if (src_tcon->ses != target_tcon->ses) {
1216 cifs_dbg(VFS, "source and target of copy not on same server\n");
1221 if (!target_tcon->ses->server->ops->copychunk_range)
1225 * Note: cifs case is easier than btrfs since server responsible for
1226 * checks for proper open modes and file type and if it wants
1227 * server could even support copy of range where source = target
1229 lock_two_nondirectories(target_inode, src_inode);
1231 cifs_dbg(FYI, "about to flush pages\n");
1232 /* should we flush first and last page first */
1233 truncate_inode_pages(&target_inode->i_data, 0);
1235 rc = file_modified(dst_file);
1237 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1238 smb_file_src, smb_file_target, off, len, destoff);
1240 file_accessed(src_file);
1242 /* force revalidate of size and timestamps of target file now
1243 * that target is updated on the server
1245 CIFS_I(target_inode)->time = 0;
1246 /* although unlocking in the reverse order from locking is not
1247 * strictly necessary here it is a little cleaner to be consistent
1249 unlock_two_nondirectories(src_inode, target_inode);
1256 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1257 * is a dummy operation.
1259 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1261 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1267 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1268 struct file *dst_file, loff_t destoff,
1269 size_t len, unsigned int flags)
1271 unsigned int xid = get_xid();
1273 struct cifsFileInfo *cfile = dst_file->private_data;
1275 if (cfile->swapfile)
1278 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1282 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1283 rc = generic_copy_file_range(src_file, off, dst_file,
1284 destoff, len, flags);
1288 const struct file_operations cifs_file_ops = {
1289 .read_iter = cifs_loose_read_iter,
1290 .write_iter = cifs_file_write_iter,
1292 .release = cifs_close,
1294 .flock = cifs_flock,
1295 .fsync = cifs_fsync,
1296 .flush = cifs_flush,
1297 .mmap = cifs_file_mmap,
1298 .splice_read = generic_file_splice_read,
1299 .splice_write = iter_file_splice_write,
1300 .llseek = cifs_llseek,
1301 .unlocked_ioctl = cifs_ioctl,
1302 .copy_file_range = cifs_copy_file_range,
1303 .remap_file_range = cifs_remap_file_range,
1304 .setlease = cifs_setlease,
1305 .fallocate = cifs_fallocate,
1308 const struct file_operations cifs_file_strict_ops = {
1309 .read_iter = cifs_strict_readv,
1310 .write_iter = cifs_strict_writev,
1312 .release = cifs_close,
1314 .flock = cifs_flock,
1315 .fsync = cifs_strict_fsync,
1316 .flush = cifs_flush,
1317 .mmap = cifs_file_strict_mmap,
1318 .splice_read = generic_file_splice_read,
1319 .splice_write = iter_file_splice_write,
1320 .llseek = cifs_llseek,
1321 .unlocked_ioctl = cifs_ioctl,
1322 .copy_file_range = cifs_copy_file_range,
1323 .remap_file_range = cifs_remap_file_range,
1324 .setlease = cifs_setlease,
1325 .fallocate = cifs_fallocate,
1328 const struct file_operations cifs_file_direct_ops = {
1329 .read_iter = cifs_direct_readv,
1330 .write_iter = cifs_direct_writev,
1332 .release = cifs_close,
1334 .flock = cifs_flock,
1335 .fsync = cifs_fsync,
1336 .flush = cifs_flush,
1337 .mmap = cifs_file_mmap,
1338 .splice_read = generic_file_splice_read,
1339 .splice_write = iter_file_splice_write,
1340 .unlocked_ioctl = cifs_ioctl,
1341 .copy_file_range = cifs_copy_file_range,
1342 .remap_file_range = cifs_remap_file_range,
1343 .llseek = cifs_llseek,
1344 .setlease = cifs_setlease,
1345 .fallocate = cifs_fallocate,
1348 const struct file_operations cifs_file_nobrl_ops = {
1349 .read_iter = cifs_loose_read_iter,
1350 .write_iter = cifs_file_write_iter,
1352 .release = cifs_close,
1353 .fsync = cifs_fsync,
1354 .flush = cifs_flush,
1355 .mmap = cifs_file_mmap,
1356 .splice_read = generic_file_splice_read,
1357 .splice_write = iter_file_splice_write,
1358 .llseek = cifs_llseek,
1359 .unlocked_ioctl = cifs_ioctl,
1360 .copy_file_range = cifs_copy_file_range,
1361 .remap_file_range = cifs_remap_file_range,
1362 .setlease = cifs_setlease,
1363 .fallocate = cifs_fallocate,
1366 const struct file_operations cifs_file_strict_nobrl_ops = {
1367 .read_iter = cifs_strict_readv,
1368 .write_iter = cifs_strict_writev,
1370 .release = cifs_close,
1371 .fsync = cifs_strict_fsync,
1372 .flush = cifs_flush,
1373 .mmap = cifs_file_strict_mmap,
1374 .splice_read = generic_file_splice_read,
1375 .splice_write = iter_file_splice_write,
1376 .llseek = cifs_llseek,
1377 .unlocked_ioctl = cifs_ioctl,
1378 .copy_file_range = cifs_copy_file_range,
1379 .remap_file_range = cifs_remap_file_range,
1380 .setlease = cifs_setlease,
1381 .fallocate = cifs_fallocate,
1384 const struct file_operations cifs_file_direct_nobrl_ops = {
1385 .read_iter = cifs_direct_readv,
1386 .write_iter = cifs_direct_writev,
1388 .release = cifs_close,
1389 .fsync = cifs_fsync,
1390 .flush = cifs_flush,
1391 .mmap = cifs_file_mmap,
1392 .splice_read = generic_file_splice_read,
1393 .splice_write = iter_file_splice_write,
1394 .unlocked_ioctl = cifs_ioctl,
1395 .copy_file_range = cifs_copy_file_range,
1396 .remap_file_range = cifs_remap_file_range,
1397 .llseek = cifs_llseek,
1398 .setlease = cifs_setlease,
1399 .fallocate = cifs_fallocate,
1402 const struct file_operations cifs_dir_ops = {
1403 .iterate_shared = cifs_readdir,
1404 .release = cifs_closedir,
1405 .read = generic_read_dir,
1406 .unlocked_ioctl = cifs_ioctl,
1407 .copy_file_range = cifs_copy_file_range,
1408 .remap_file_range = cifs_remap_file_range,
1409 .llseek = generic_file_llseek,
1410 .fsync = cifs_dir_fsync,
1414 cifs_init_once(void *inode)
1416 struct cifsInodeInfo *cifsi = inode;
1418 inode_init_once(&cifsi->vfs_inode);
1419 init_rwsem(&cifsi->lock_sem);
1423 cifs_init_inodecache(void)
1425 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1426 sizeof(struct cifsInodeInfo),
1427 0, (SLAB_RECLAIM_ACCOUNT|
1428 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1430 if (cifs_inode_cachep == NULL)
1437 cifs_destroy_inodecache(void)
1440 * Make sure all delayed rcu free inodes are flushed before we
1444 kmem_cache_destroy(cifs_inode_cachep);
1448 cifs_init_request_bufs(void)
1451 * SMB2 maximum header size is bigger than CIFS one - no problems to
1452 * allocate some more bytes for CIFS.
1454 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1456 if (CIFSMaxBufSize < 8192) {
1457 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1458 Unicode path name has to fit in any SMB/CIFS path based frames */
1459 CIFSMaxBufSize = 8192;
1460 } else if (CIFSMaxBufSize > 1024*127) {
1461 CIFSMaxBufSize = 1024 * 127;
1463 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1466 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1467 CIFSMaxBufSize, CIFSMaxBufSize);
1469 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1470 CIFSMaxBufSize + max_hdr_size, 0,
1471 SLAB_HWCACHE_ALIGN, 0,
1472 CIFSMaxBufSize + max_hdr_size,
1474 if (cifs_req_cachep == NULL)
1477 if (cifs_min_rcv < 1)
1479 else if (cifs_min_rcv > 64) {
1481 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1484 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1487 if (cifs_req_poolp == NULL) {
1488 kmem_cache_destroy(cifs_req_cachep);
1491 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1492 almost all handle based requests (but not write response, nor is it
1493 sufficient for path based requests). A smaller size would have
1494 been more efficient (compacting multiple slab items on one 4k page)
1495 for the case in which debug was on, but this larger size allows
1496 more SMBs to use small buffer alloc and is still much more
1497 efficient to alloc 1 per page off the slab compared to 17K (5page)
1498 alloc of large cifs buffers even when page debugging is on */
1499 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1500 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1501 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1502 if (cifs_sm_req_cachep == NULL) {
1503 mempool_destroy(cifs_req_poolp);
1504 kmem_cache_destroy(cifs_req_cachep);
1508 if (cifs_min_small < 2)
1510 else if (cifs_min_small > 256) {
1511 cifs_min_small = 256;
1512 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1515 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1516 cifs_sm_req_cachep);
1518 if (cifs_sm_req_poolp == NULL) {
1519 mempool_destroy(cifs_req_poolp);
1520 kmem_cache_destroy(cifs_req_cachep);
1521 kmem_cache_destroy(cifs_sm_req_cachep);
1529 cifs_destroy_request_bufs(void)
1531 mempool_destroy(cifs_req_poolp);
1532 kmem_cache_destroy(cifs_req_cachep);
1533 mempool_destroy(cifs_sm_req_poolp);
1534 kmem_cache_destroy(cifs_sm_req_cachep);
1538 cifs_init_mids(void)
1540 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1541 sizeof(struct mid_q_entry), 0,
1542 SLAB_HWCACHE_ALIGN, NULL);
1543 if (cifs_mid_cachep == NULL)
1546 /* 3 is a reasonable minimum number of simultaneous operations */
1547 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1548 if (cifs_mid_poolp == NULL) {
1549 kmem_cache_destroy(cifs_mid_cachep);
1557 cifs_destroy_mids(void)
1559 mempool_destroy(cifs_mid_poolp);
1560 kmem_cache_destroy(cifs_mid_cachep);
1568 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1570 * Initialize Global counters
1572 atomic_set(&sesInfoAllocCount, 0);
1573 atomic_set(&tconInfoAllocCount, 0);
1574 atomic_set(&tcpSesNextId, 0);
1575 atomic_set(&tcpSesAllocCount, 0);
1576 atomic_set(&tcpSesReconnectCount, 0);
1577 atomic_set(&tconInfoReconnectCount, 0);
1579 atomic_set(&buf_alloc_count, 0);
1580 atomic_set(&small_buf_alloc_count, 0);
1581 #ifdef CONFIG_CIFS_STATS2
1582 atomic_set(&total_buf_alloc_count, 0);
1583 atomic_set(&total_small_buf_alloc_count, 0);
1584 if (slow_rsp_threshold < 1)
1585 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1586 else if (slow_rsp_threshold > 32767)
1588 "slow response threshold set higher than recommended (0 to 32767)\n");
1589 #endif /* CONFIG_CIFS_STATS2 */
1591 atomic_set(&mid_count, 0);
1592 GlobalCurrentXid = 0;
1593 GlobalTotalActiveXid = 0;
1594 GlobalMaxActiveXid = 0;
1595 spin_lock_init(&cifs_tcp_ses_lock);
1596 spin_lock_init(&GlobalMid_Lock);
1598 cifs_lock_secret = get_random_u32();
1600 if (cifs_max_pending < 2) {
1601 cifs_max_pending = 2;
1602 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1603 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1604 cifs_max_pending = CIFS_MAX_REQ;
1605 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1609 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1612 goto out_clean_proc;
1616 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1617 * so that we don't launch too many worker threads but
1618 * Documentation/core-api/workqueue.rst recommends setting it to 0
1621 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1622 decrypt_wq = alloc_workqueue("smb3decryptd",
1623 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1626 goto out_destroy_cifsiod_wq;
1629 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1630 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1631 if (!fileinfo_put_wq) {
1633 goto out_destroy_decrypt_wq;
1636 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1637 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1638 if (!cifsoplockd_wq) {
1640 goto out_destroy_fileinfo_put_wq;
1643 deferredclose_wq = alloc_workqueue("deferredclose",
1644 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1645 if (!deferredclose_wq) {
1647 goto out_destroy_cifsoplockd_wq;
1650 rc = cifs_fscache_register();
1652 goto out_destroy_deferredclose_wq;
1654 rc = cifs_init_inodecache();
1656 goto out_unreg_fscache;
1658 rc = cifs_init_mids();
1660 goto out_destroy_inodecache;
1662 rc = cifs_init_request_bufs();
1664 goto out_destroy_mids;
1666 #ifdef CONFIG_CIFS_DFS_UPCALL
1667 rc = dfs_cache_init();
1669 goto out_destroy_request_bufs;
1670 #endif /* CONFIG_CIFS_DFS_UPCALL */
1671 #ifdef CONFIG_CIFS_UPCALL
1672 rc = init_cifs_spnego();
1674 goto out_destroy_dfs_cache;
1675 #endif /* CONFIG_CIFS_UPCALL */
1676 #ifdef CONFIG_CIFS_SWN_UPCALL
1677 rc = cifs_genl_init();
1679 goto out_register_key_type;
1680 #endif /* CONFIG_CIFS_SWN_UPCALL */
1682 rc = init_cifs_idmap();
1684 goto out_cifs_swn_init;
1686 rc = register_filesystem(&cifs_fs_type);
1688 goto out_init_cifs_idmap;
1690 rc = register_filesystem(&smb3_fs_type);
1692 unregister_filesystem(&cifs_fs_type);
1693 goto out_init_cifs_idmap;
1698 out_init_cifs_idmap:
1701 #ifdef CONFIG_CIFS_SWN_UPCALL
1703 out_register_key_type:
1705 #ifdef CONFIG_CIFS_UPCALL
1707 out_destroy_dfs_cache:
1709 #ifdef CONFIG_CIFS_DFS_UPCALL
1710 dfs_cache_destroy();
1711 out_destroy_request_bufs:
1713 cifs_destroy_request_bufs();
1715 cifs_destroy_mids();
1716 out_destroy_inodecache:
1717 cifs_destroy_inodecache();
1719 cifs_fscache_unregister();
1720 out_destroy_deferredclose_wq:
1721 destroy_workqueue(deferredclose_wq);
1722 out_destroy_cifsoplockd_wq:
1723 destroy_workqueue(cifsoplockd_wq);
1724 out_destroy_fileinfo_put_wq:
1725 destroy_workqueue(fileinfo_put_wq);
1726 out_destroy_decrypt_wq:
1727 destroy_workqueue(decrypt_wq);
1728 out_destroy_cifsiod_wq:
1729 destroy_workqueue(cifsiod_wq);
1738 cifs_dbg(NOISY, "exit_smb3\n");
1739 unregister_filesystem(&cifs_fs_type);
1740 unregister_filesystem(&smb3_fs_type);
1741 cifs_dfs_release_automount_timer();
1743 #ifdef CONFIG_CIFS_SWN_UPCALL
1746 #ifdef CONFIG_CIFS_UPCALL
1749 #ifdef CONFIG_CIFS_DFS_UPCALL
1750 dfs_cache_destroy();
1752 cifs_destroy_request_bufs();
1753 cifs_destroy_mids();
1754 cifs_destroy_inodecache();
1755 cifs_fscache_unregister();
1756 destroy_workqueue(deferredclose_wq);
1757 destroy_workqueue(cifsoplockd_wq);
1758 destroy_workqueue(decrypt_wq);
1759 destroy_workqueue(fileinfo_put_wq);
1760 destroy_workqueue(cifsiod_wq);
1764 MODULE_AUTHOR("Steve French");
1765 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1767 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1768 "also older servers complying with the SNIA CIFS Specification)");
1769 MODULE_VERSION(CIFS_VERSION);
1770 MODULE_SOFTDEP("ecb");
1771 MODULE_SOFTDEP("hmac");
1772 MODULE_SOFTDEP("md5");
1773 MODULE_SOFTDEP("nls");
1774 MODULE_SOFTDEP("aes");
1775 MODULE_SOFTDEP("cmac");
1776 MODULE_SOFTDEP("sha256");
1777 MODULE_SOFTDEP("sha512");
1778 MODULE_SOFTDEP("aead2");
1779 MODULE_SOFTDEP("ccm");
1780 MODULE_SOFTDEP("gcm");
1781 module_init(init_cifs)
1782 module_exit(exit_cifs)