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>
32 #define DECLARE_GLOBALS_HERE
34 #include "cifsproto.h"
35 #include "cifs_debug.h"
36 #include "cifs_fs_sb.h"
38 #include <linux/key-type.h>
39 #include "cifs_spnego.h"
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_MAGIC_NUMBER;
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->rsize == 0)
214 cifs_sb->ctx->rsize =
215 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
216 if (cifs_sb->ctx->rasize)
217 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
219 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
221 sb->s_blocksize = CIFS_MAX_MSGSIZE;
222 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
223 inode = cifs_root_iget(sb);
231 sb->s_d_op = &cifs_ci_dentry_ops;
233 sb->s_d_op = &cifs_dentry_ops;
235 sb->s_root = d_make_root(inode);
241 #ifdef CONFIG_CIFS_NFSD_EXPORT
242 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
243 cifs_dbg(FYI, "export ops supported\n");
244 sb->s_export_op = &cifs_export_ops;
246 #endif /* CONFIG_CIFS_NFSD_EXPORT */
251 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
255 static void cifs_kill_sb(struct super_block *sb)
257 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
258 struct cifs_tcon *tcon;
259 struct cached_fid *cfid;
260 struct rb_root *root = &cifs_sb->tlink_tree;
261 struct rb_node *node;
262 struct tcon_link *tlink;
265 * We ned to release all dentries for the cached directories
266 * before we kill the sb.
269 for (node = rb_first(root); node; node = rb_next(node)) {
270 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
271 tcon = tlink_tcon(tlink);
275 mutex_lock(&cfid->fid_mutex);
280 mutex_unlock(&cfid->fid_mutex);
283 /* finally release root dentry */
285 cifs_sb->root = NULL;
289 cifs_umount(cifs_sb);
293 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
295 struct super_block *sb = dentry->d_sb;
296 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
297 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
298 struct TCP_Server_Info *server = tcon->ses->server;
304 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
306 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
308 buf->f_namelen = PATH_MAX;
310 buf->f_fsid.val[0] = tcon->vol_serial_number;
311 /* are using part of create time for more randomness, see man statfs */
312 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
314 buf->f_files = 0; /* undefined */
315 buf->f_ffree = 0; /* unlimited */
317 if (server->ops->queryfs)
318 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
324 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
326 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
327 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
328 struct TCP_Server_Info *server = tcon->ses->server;
330 if (server->ops->fallocate)
331 return server->ops->fallocate(file, tcon, mode, off, len);
336 static int cifs_permission(struct user_namespace *mnt_userns,
337 struct inode *inode, int mask)
339 struct cifs_sb_info *cifs_sb;
341 cifs_sb = CIFS_SB(inode->i_sb);
343 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
344 if ((mask & MAY_EXEC) && !execute_ok(inode))
348 } else /* file mode might have been restricted at mount time
349 on the client (above and beyond ACL on servers) for
350 servers which do not support setting and viewing mode bits,
351 so allowing client to check permissions is useful */
352 return generic_permission(&init_user_ns, inode, mask);
355 static struct kmem_cache *cifs_inode_cachep;
356 static struct kmem_cache *cifs_req_cachep;
357 static struct kmem_cache *cifs_mid_cachep;
358 static struct kmem_cache *cifs_sm_req_cachep;
359 mempool_t *cifs_sm_req_poolp;
360 mempool_t *cifs_req_poolp;
361 mempool_t *cifs_mid_poolp;
363 static struct inode *
364 cifs_alloc_inode(struct super_block *sb)
366 struct cifsInodeInfo *cifs_inode;
367 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
370 cifs_inode->cifsAttrs = 0x20; /* default */
371 cifs_inode->time = 0;
373 * Until the file is open and we have gotten oplock info back from the
374 * server, can not assume caching of file data or metadata.
376 cifs_set_oplock_level(cifs_inode, 0);
377 cifs_inode->flags = 0;
378 spin_lock_init(&cifs_inode->writers_lock);
379 cifs_inode->writers = 0;
380 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
381 cifs_inode->server_eof = 0;
382 cifs_inode->uniqueid = 0;
383 cifs_inode->createtime = 0;
384 cifs_inode->epoch = 0;
385 spin_lock_init(&cifs_inode->open_file_lock);
386 generate_random_uuid(cifs_inode->lease_key);
389 * Can not set i_flags here - they get immediately overwritten to zero
392 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
393 INIT_LIST_HEAD(&cifs_inode->openFileList);
394 INIT_LIST_HEAD(&cifs_inode->llist);
395 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
396 spin_lock_init(&cifs_inode->deferred_lock);
397 return &cifs_inode->vfs_inode;
401 cifs_free_inode(struct inode *inode)
403 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
407 cifs_evict_inode(struct inode *inode)
409 truncate_inode_pages_final(&inode->i_data);
414 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
416 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
417 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
419 seq_puts(s, ",addr=");
421 switch (server->dstaddr.ss_family) {
423 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
426 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
427 if (sa6->sin6_scope_id)
428 seq_printf(s, "%%%u", sa6->sin6_scope_id);
431 seq_puts(s, "(unknown)");
434 seq_puts(s, ",rdma");
438 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
440 if (ses->sectype == Unspecified) {
441 if (ses->user_name == NULL)
442 seq_puts(s, ",sec=none");
446 seq_puts(s, ",sec=");
448 switch (ses->sectype) {
450 seq_puts(s, "ntlmv2");
456 seq_puts(s, "ntlmssp");
459 /* shouldn't ever happen */
460 seq_puts(s, "unknown");
467 if (ses->sectype == Kerberos)
468 seq_printf(s, ",cruid=%u",
469 from_kuid_munged(&init_user_ns, ses->cred_uid));
473 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
475 seq_puts(s, ",cache=");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
478 seq_puts(s, "strict");
479 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
481 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
482 seq_puts(s, "singleclient"); /* assume only one client access */
483 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
484 seq_puts(s, "ro"); /* read only caching assumed */
486 seq_puts(s, "loose");
490 * cifs_show_devname() is used so we show the mount device name with correct
491 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
493 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
495 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
496 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
501 convert_delimiter(devname, '/');
502 /* escape all spaces in share names */
503 seq_escape(m, devname, " \t");
510 * cifs_show_options() is for displaying mount options in /proc/mounts.
511 * Not all settable options are displayed but most of the important
515 cifs_show_options(struct seq_file *s, struct dentry *root)
517 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
518 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
519 struct sockaddr *srcaddr;
520 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
522 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
523 cifs_show_security(s, tcon->ses);
524 cifs_show_cache_flavor(s, cifs_sb);
527 seq_puts(s, ",nolease");
528 if (cifs_sb->ctx->multiuser)
529 seq_puts(s, ",multiuser");
530 else if (tcon->ses->user_name)
531 seq_show_option(s, "username", tcon->ses->user_name);
533 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
534 seq_show_option(s, "domain", tcon->ses->domainName);
536 if (srcaddr->sa_family != AF_UNSPEC) {
537 struct sockaddr_in *saddr4;
538 struct sockaddr_in6 *saddr6;
539 saddr4 = (struct sockaddr_in *)srcaddr;
540 saddr6 = (struct sockaddr_in6 *)srcaddr;
541 if (srcaddr->sa_family == AF_INET6)
542 seq_printf(s, ",srcaddr=%pI6c",
544 else if (srcaddr->sa_family == AF_INET)
545 seq_printf(s, ",srcaddr=%pI4",
546 &saddr4->sin_addr.s_addr);
548 seq_printf(s, ",srcaddr=BAD-AF:%i",
549 (int)(srcaddr->sa_family));
552 seq_printf(s, ",uid=%u",
553 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
554 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
555 seq_puts(s, ",forceuid");
557 seq_puts(s, ",noforceuid");
559 seq_printf(s, ",gid=%u",
560 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
561 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
562 seq_puts(s, ",forcegid");
564 seq_puts(s, ",noforcegid");
566 cifs_show_address(s, tcon->ses->server);
569 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
570 cifs_sb->ctx->file_mode,
571 cifs_sb->ctx->dir_mode);
572 if (cifs_sb->ctx->iocharset)
573 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
575 seq_puts(s, ",seal");
576 else if (tcon->ses->server->ignore_signature)
577 seq_puts(s, ",signloosely");
579 seq_puts(s, ",nocase");
581 seq_puts(s, ",nodelete");
582 if (tcon->local_lease)
583 seq_puts(s, ",locallease");
585 seq_puts(s, ",hard");
587 seq_puts(s, ",soft");
588 if (tcon->use_persistent)
589 seq_puts(s, ",persistenthandles");
590 else if (tcon->use_resilient)
591 seq_puts(s, ",resilienthandles");
592 if (tcon->posix_extensions)
593 seq_puts(s, ",posix");
594 else if (tcon->unix_ext)
595 seq_puts(s, ",unix");
597 seq_puts(s, ",nounix");
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
599 seq_puts(s, ",nodfs");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
601 seq_puts(s, ",posixpaths");
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
603 seq_puts(s, ",setuids");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
605 seq_puts(s, ",idsfromsid");
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
607 seq_puts(s, ",serverino");
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
609 seq_puts(s, ",rwpidforward");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
611 seq_puts(s, ",forcemand");
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
613 seq_puts(s, ",nouser_xattr");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
615 seq_puts(s, ",mapchars");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
617 seq_puts(s, ",mapposix");
618 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
621 seq_puts(s, ",nobrl");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
623 seq_puts(s, ",nohandlecache");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
625 seq_puts(s, ",modefromsid");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
627 seq_puts(s, ",cifsacl");
628 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
629 seq_puts(s, ",dynperm");
630 if (root->d_sb->s_flags & SB_POSIXACL)
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
633 seq_puts(s, ",mfsymlinks");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
637 seq_puts(s, ",nostrictsync");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
639 seq_puts(s, ",noperm");
640 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
641 seq_printf(s, ",backupuid=%u",
642 from_kuid_munged(&init_user_ns,
643 cifs_sb->ctx->backupuid));
644 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
645 seq_printf(s, ",backupgid=%u",
646 from_kgid_munged(&init_user_ns,
647 cifs_sb->ctx->backupgid));
649 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
650 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
651 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
652 if (cifs_sb->ctx->rasize)
653 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
654 if (tcon->ses->server->min_offload)
655 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
656 seq_printf(s, ",echo_interval=%lu",
657 tcon->ses->server->echo_interval / HZ);
659 /* Only display the following if overridden on mount */
660 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
661 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
662 if (tcon->ses->server->tcp_nodelay)
663 seq_puts(s, ",tcpnodelay");
664 if (tcon->ses->server->noautotune)
665 seq_puts(s, ",noautotune");
666 if (tcon->ses->server->noblocksnd)
667 seq_puts(s, ",noblocksend");
669 if (tcon->snapshot_time)
670 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
671 if (tcon->handle_timeout)
672 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
675 * Display file and directory attribute timeout in seconds.
676 * If file and directory attribute timeout the same then actimeo
677 * was likely specified on mount
679 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
680 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
682 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
683 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
685 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
687 if (tcon->ses->chan_max > 1)
688 seq_printf(s, ",multichannel,max_channels=%zu",
689 tcon->ses->chan_max);
691 if (tcon->use_witness)
692 seq_puts(s, ",witness");
697 static void cifs_umount_begin(struct super_block *sb)
699 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
700 struct cifs_tcon *tcon;
705 tcon = cifs_sb_master_tcon(cifs_sb);
707 spin_lock(&cifs_tcp_ses_lock);
708 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
709 /* we have other mounts to same share or we have
710 already tried to force umount this and woken up
711 all waiting network requests, nothing to do */
712 spin_unlock(&cifs_tcp_ses_lock);
714 } else if (tcon->tc_count == 1)
715 tcon->tidStatus = CifsExiting;
716 spin_unlock(&cifs_tcp_ses_lock);
718 cifs_close_all_deferred_files(tcon);
719 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
720 /* cancel_notify_requests(tcon); */
721 if (tcon->ses && tcon->ses->server) {
722 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
723 wake_up_all(&tcon->ses->server->request_q);
724 wake_up_all(&tcon->ses->server->response_q);
725 msleep(1); /* yield */
726 /* we have to kick the requests once more */
727 wake_up_all(&tcon->ses->server->response_q);
734 static int cifs_freeze(struct super_block *sb)
736 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
737 struct cifs_tcon *tcon;
742 tcon = cifs_sb_master_tcon(cifs_sb);
744 cifs_close_all_deferred_files(tcon);
748 #ifdef CONFIG_CIFS_STATS2
749 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
756 static int cifs_drop_inode(struct inode *inode)
758 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
760 /* no serverino => unconditional eviction */
761 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
762 generic_drop_inode(inode);
765 static const struct super_operations cifs_super_ops = {
766 .statfs = cifs_statfs,
767 .alloc_inode = cifs_alloc_inode,
768 .free_inode = cifs_free_inode,
769 .drop_inode = cifs_drop_inode,
770 .evict_inode = cifs_evict_inode,
771 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
772 .show_devname = cifs_show_devname,
773 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
774 function unless later we add lazy close of inodes or unless the
775 kernel forgets to call us with the same number of releases (closes)
777 .show_options = cifs_show_options,
778 .umount_begin = cifs_umount_begin,
779 .freeze_fs = cifs_freeze,
780 #ifdef CONFIG_CIFS_STATS2
781 .show_stats = cifs_show_stats,
786 * Get root dentry from superblock according to prefix path mount option.
787 * Return dentry with refcount + 1 on success and NULL otherwise.
789 static struct dentry *
790 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
792 struct dentry *dentry;
793 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
794 char *full_path = NULL;
798 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
799 return dget(sb->s_root);
801 full_path = cifs_build_path_to_root(ctx, cifs_sb,
802 cifs_sb_master_tcon(cifs_sb), 0);
803 if (full_path == NULL)
804 return ERR_PTR(-ENOMEM);
806 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
808 sep = CIFS_DIR_SEP(cifs_sb);
809 dentry = dget(sb->s_root);
813 struct inode *dir = d_inode(dentry);
814 struct dentry *child;
816 if (!S_ISDIR(dir->i_mode)) {
818 dentry = ERR_PTR(-ENOTDIR);
822 /* skip separators */
829 while (*s && *s != sep)
832 child = lookup_positive_unlocked(p, dentry, s - p);
835 } while (!IS_ERR(dentry));
840 static int cifs_set_super(struct super_block *sb, void *data)
842 struct cifs_mnt_data *mnt_data = data;
843 sb->s_fs_info = mnt_data->cifs_sb;
844 return set_anon_super(sb, NULL);
848 cifs_smb3_do_mount(struct file_system_type *fs_type,
849 int flags, struct smb3_fs_context *old_ctx)
851 struct cifs_mnt_data mnt_data;
852 struct cifs_sb_info *cifs_sb;
853 struct super_block *sb;
858 * Prints in Kernel / CIFS log the attempted mount operation
859 * If CIFS_DEBUG && cifs_FYI
862 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
864 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
866 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
868 return ERR_PTR(-ENOMEM);
870 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
872 root = ERR_PTR(-ENOMEM);
875 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
881 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
887 rc = cifs_setup_cifs_sb(cifs_sb);
893 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
895 if (!(flags & SB_SILENT))
896 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
902 mnt_data.ctx = cifs_sb->ctx;
903 mnt_data.cifs_sb = cifs_sb;
904 mnt_data.flags = flags;
906 /* BB should we make this contingent on mount parm? */
907 flags |= SB_NODIRATIME | SB_NOATIME;
909 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
911 cifs_umount(cifs_sb);
916 cifs_dbg(FYI, "Use existing superblock\n");
917 cifs_umount(cifs_sb);
920 rc = cifs_read_super(sb);
926 sb->s_flags |= SB_ACTIVE;
929 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
934 cifs_sb->root = dget(root);
936 cifs_dbg(FYI, "dentry root is: %p\n", root);
940 deactivate_locked_super(sb);
943 kfree(cifs_sb->prepath);
944 smb3_cleanup_fs_context(cifs_sb->ctx);
951 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
954 struct inode *inode = file_inode(iocb->ki_filp);
956 if (iocb->ki_flags & IOCB_DIRECT)
957 return cifs_user_readv(iocb, iter);
959 rc = cifs_revalidate_mapping(inode);
963 return generic_file_read_iter(iocb, iter);
966 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
968 struct inode *inode = file_inode(iocb->ki_filp);
969 struct cifsInodeInfo *cinode = CIFS_I(inode);
973 if (iocb->ki_filp->f_flags & O_DIRECT) {
974 written = cifs_user_writev(iocb, from);
975 if (written > 0 && CIFS_CACHE_READ(cinode)) {
976 cifs_zap_mapping(inode);
978 "Set no oplock for inode=%p after a write operation\n",
985 written = cifs_get_writer(cinode);
989 written = generic_file_write_iter(iocb, from);
991 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
994 rc = filemap_fdatawrite(inode->i_mapping);
996 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1000 cifs_put_writer(cinode);
1004 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1006 struct cifsFileInfo *cfile = file->private_data;
1007 struct cifs_tcon *tcon;
1010 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1011 * the cached file length
1013 if (whence != SEEK_SET && whence != SEEK_CUR) {
1015 struct inode *inode = file_inode(file);
1018 * We need to be sure that all dirty pages are written and the
1019 * server has the newest file length.
1021 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1022 inode->i_mapping->nrpages != 0) {
1023 rc = filemap_fdatawait(inode->i_mapping);
1025 mapping_set_error(inode->i_mapping, rc);
1030 * Some applications poll for the file length in this strange
1031 * way so we must seek to end on non-oplocked files by
1032 * setting the revalidate time to zero.
1034 CIFS_I(inode)->time = 0;
1036 rc = cifs_revalidate_file_attr(file);
1040 if (cfile && cfile->tlink) {
1041 tcon = tlink_tcon(cfile->tlink);
1042 if (tcon->ses->server->ops->llseek)
1043 return tcon->ses->server->ops->llseek(file, tcon,
1046 return generic_file_llseek(file, offset, whence);
1050 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1053 * Note that this is called by vfs setlease with i_lock held to
1054 * protect *lease from going away.
1056 struct inode *inode = file_inode(file);
1057 struct cifsFileInfo *cfile = file->private_data;
1059 if (!(S_ISREG(inode->i_mode)))
1062 /* Check if file is oplocked if this is request for new lease */
1063 if (arg == F_UNLCK ||
1064 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1065 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1066 return generic_setlease(file, arg, lease, priv);
1067 else if (tlink_tcon(cfile->tlink)->local_lease &&
1068 !CIFS_CACHE_READ(CIFS_I(inode)))
1070 * If the server claims to support oplock on this file, then we
1071 * still need to check oplock even if the local_lease mount
1072 * option is set, but there are servers which do not support
1073 * oplock for which this mount option may be useful if the user
1074 * knows that the file won't be changed on the server by anyone
1077 return generic_setlease(file, arg, lease, priv);
1082 struct file_system_type cifs_fs_type = {
1083 .owner = THIS_MODULE,
1085 .init_fs_context = smb3_init_fs_context,
1086 .parameters = smb3_fs_parameters,
1087 .kill_sb = cifs_kill_sb,
1088 .fs_flags = FS_RENAME_DOES_D_MOVE,
1090 MODULE_ALIAS_FS("cifs");
1092 struct file_system_type smb3_fs_type = {
1093 .owner = THIS_MODULE,
1095 .init_fs_context = smb3_init_fs_context,
1096 .parameters = smb3_fs_parameters,
1097 .kill_sb = cifs_kill_sb,
1098 .fs_flags = FS_RENAME_DOES_D_MOVE,
1100 MODULE_ALIAS_FS("smb3");
1101 MODULE_ALIAS("smb3");
1103 const struct inode_operations cifs_dir_inode_ops = {
1104 .create = cifs_create,
1105 .atomic_open = cifs_atomic_open,
1106 .lookup = cifs_lookup,
1107 .getattr = cifs_getattr,
1108 .unlink = cifs_unlink,
1109 .link = cifs_hardlink,
1110 .mkdir = cifs_mkdir,
1111 .rmdir = cifs_rmdir,
1112 .rename = cifs_rename2,
1113 .permission = cifs_permission,
1114 .setattr = cifs_setattr,
1115 .symlink = cifs_symlink,
1116 .mknod = cifs_mknod,
1117 .listxattr = cifs_listxattr,
1120 const struct inode_operations cifs_file_inode_ops = {
1121 .setattr = cifs_setattr,
1122 .getattr = cifs_getattr,
1123 .permission = cifs_permission,
1124 .listxattr = cifs_listxattr,
1125 .fiemap = cifs_fiemap,
1128 const struct inode_operations cifs_symlink_inode_ops = {
1129 .get_link = cifs_get_link,
1130 .permission = cifs_permission,
1131 .listxattr = cifs_listxattr,
1134 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1135 struct file *dst_file, loff_t destoff, loff_t len,
1136 unsigned int remap_flags)
1138 struct inode *src_inode = file_inode(src_file);
1139 struct inode *target_inode = file_inode(dst_file);
1140 struct cifsFileInfo *smb_file_src = src_file->private_data;
1141 struct cifsFileInfo *smb_file_target;
1142 struct cifs_tcon *target_tcon;
1146 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1149 cifs_dbg(FYI, "clone range\n");
1153 if (!src_file->private_data || !dst_file->private_data) {
1155 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1159 smb_file_target = dst_file->private_data;
1160 target_tcon = tlink_tcon(smb_file_target->tlink);
1163 * Note: cifs case is easier than btrfs since server responsible for
1164 * checks for proper open modes and file type and if it wants
1165 * server could even support copy of range where source = target
1167 lock_two_nondirectories(target_inode, src_inode);
1170 len = src_inode->i_size - off;
1172 cifs_dbg(FYI, "about to flush pages\n");
1173 /* should we flush first and last page first */
1174 truncate_inode_pages_range(&target_inode->i_data, destoff,
1175 PAGE_ALIGN(destoff + len)-1);
1177 if (target_tcon->ses->server->ops->duplicate_extents)
1178 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1179 smb_file_src, smb_file_target, off, len, destoff);
1183 /* force revalidate of size and timestamps of target file now
1184 that target is updated on the server */
1185 CIFS_I(target_inode)->time = 0;
1186 /* although unlocking in the reverse order from locking is not
1187 strictly necessary here it is a little cleaner to be consistent */
1188 unlock_two_nondirectories(src_inode, target_inode);
1191 return rc < 0 ? rc : len;
1194 ssize_t cifs_file_copychunk_range(unsigned int xid,
1195 struct file *src_file, loff_t off,
1196 struct file *dst_file, loff_t destoff,
1197 size_t len, unsigned int flags)
1199 struct inode *src_inode = file_inode(src_file);
1200 struct inode *target_inode = file_inode(dst_file);
1201 struct cifsFileInfo *smb_file_src;
1202 struct cifsFileInfo *smb_file_target;
1203 struct cifs_tcon *src_tcon;
1204 struct cifs_tcon *target_tcon;
1207 cifs_dbg(FYI, "copychunk range\n");
1209 if (!src_file->private_data || !dst_file->private_data) {
1211 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1216 smb_file_target = dst_file->private_data;
1217 smb_file_src = src_file->private_data;
1218 src_tcon = tlink_tcon(smb_file_src->tlink);
1219 target_tcon = tlink_tcon(smb_file_target->tlink);
1221 if (src_tcon->ses != target_tcon->ses) {
1222 cifs_dbg(VFS, "source and target of copy not on same server\n");
1227 if (!target_tcon->ses->server->ops->copychunk_range)
1231 * Note: cifs case is easier than btrfs since server responsible for
1232 * checks for proper open modes and file type and if it wants
1233 * server could even support copy of range where source = target
1235 lock_two_nondirectories(target_inode, src_inode);
1237 cifs_dbg(FYI, "about to flush pages\n");
1238 /* should we flush first and last page first */
1239 truncate_inode_pages(&target_inode->i_data, 0);
1241 rc = file_modified(dst_file);
1243 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1244 smb_file_src, smb_file_target, off, len, destoff);
1246 file_accessed(src_file);
1248 /* force revalidate of size and timestamps of target file now
1249 * that target is updated on the server
1251 CIFS_I(target_inode)->time = 0;
1252 /* although unlocking in the reverse order from locking is not
1253 * strictly necessary here it is a little cleaner to be consistent
1255 unlock_two_nondirectories(src_inode, target_inode);
1262 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1263 * is a dummy operation.
1265 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1267 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1273 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1274 struct file *dst_file, loff_t destoff,
1275 size_t len, unsigned int flags)
1277 unsigned int xid = get_xid();
1279 struct cifsFileInfo *cfile = dst_file->private_data;
1281 if (cfile->swapfile) {
1287 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1291 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1292 rc = generic_copy_file_range(src_file, off, dst_file,
1293 destoff, len, flags);
1297 const struct file_operations cifs_file_ops = {
1298 .read_iter = cifs_loose_read_iter,
1299 .write_iter = cifs_file_write_iter,
1301 .release = cifs_close,
1303 .flock = cifs_flock,
1304 .fsync = cifs_fsync,
1305 .flush = cifs_flush,
1306 .mmap = cifs_file_mmap,
1307 .splice_read = generic_file_splice_read,
1308 .splice_write = iter_file_splice_write,
1309 .llseek = cifs_llseek,
1310 .unlocked_ioctl = cifs_ioctl,
1311 .copy_file_range = cifs_copy_file_range,
1312 .remap_file_range = cifs_remap_file_range,
1313 .setlease = cifs_setlease,
1314 .fallocate = cifs_fallocate,
1317 const struct file_operations cifs_file_strict_ops = {
1318 .read_iter = cifs_strict_readv,
1319 .write_iter = cifs_strict_writev,
1321 .release = cifs_close,
1323 .flock = cifs_flock,
1324 .fsync = cifs_strict_fsync,
1325 .flush = cifs_flush,
1326 .mmap = cifs_file_strict_mmap,
1327 .splice_read = generic_file_splice_read,
1328 .splice_write = iter_file_splice_write,
1329 .llseek = cifs_llseek,
1330 .unlocked_ioctl = cifs_ioctl,
1331 .copy_file_range = cifs_copy_file_range,
1332 .remap_file_range = cifs_remap_file_range,
1333 .setlease = cifs_setlease,
1334 .fallocate = cifs_fallocate,
1337 const struct file_operations cifs_file_direct_ops = {
1338 .read_iter = cifs_direct_readv,
1339 .write_iter = cifs_direct_writev,
1341 .release = cifs_close,
1343 .flock = cifs_flock,
1344 .fsync = cifs_fsync,
1345 .flush = cifs_flush,
1346 .mmap = cifs_file_mmap,
1347 .splice_read = generic_file_splice_read,
1348 .splice_write = iter_file_splice_write,
1349 .unlocked_ioctl = cifs_ioctl,
1350 .copy_file_range = cifs_copy_file_range,
1351 .remap_file_range = cifs_remap_file_range,
1352 .llseek = cifs_llseek,
1353 .setlease = cifs_setlease,
1354 .fallocate = cifs_fallocate,
1357 const struct file_operations cifs_file_nobrl_ops = {
1358 .read_iter = cifs_loose_read_iter,
1359 .write_iter = cifs_file_write_iter,
1361 .release = cifs_close,
1362 .fsync = cifs_fsync,
1363 .flush = cifs_flush,
1364 .mmap = cifs_file_mmap,
1365 .splice_read = generic_file_splice_read,
1366 .splice_write = iter_file_splice_write,
1367 .llseek = cifs_llseek,
1368 .unlocked_ioctl = cifs_ioctl,
1369 .copy_file_range = cifs_copy_file_range,
1370 .remap_file_range = cifs_remap_file_range,
1371 .setlease = cifs_setlease,
1372 .fallocate = cifs_fallocate,
1375 const struct file_operations cifs_file_strict_nobrl_ops = {
1376 .read_iter = cifs_strict_readv,
1377 .write_iter = cifs_strict_writev,
1379 .release = cifs_close,
1380 .fsync = cifs_strict_fsync,
1381 .flush = cifs_flush,
1382 .mmap = cifs_file_strict_mmap,
1383 .splice_read = generic_file_splice_read,
1384 .splice_write = iter_file_splice_write,
1385 .llseek = cifs_llseek,
1386 .unlocked_ioctl = cifs_ioctl,
1387 .copy_file_range = cifs_copy_file_range,
1388 .remap_file_range = cifs_remap_file_range,
1389 .setlease = cifs_setlease,
1390 .fallocate = cifs_fallocate,
1393 const struct file_operations cifs_file_direct_nobrl_ops = {
1394 .read_iter = cifs_direct_readv,
1395 .write_iter = cifs_direct_writev,
1397 .release = cifs_close,
1398 .fsync = cifs_fsync,
1399 .flush = cifs_flush,
1400 .mmap = cifs_file_mmap,
1401 .splice_read = generic_file_splice_read,
1402 .splice_write = iter_file_splice_write,
1403 .unlocked_ioctl = cifs_ioctl,
1404 .copy_file_range = cifs_copy_file_range,
1405 .remap_file_range = cifs_remap_file_range,
1406 .llseek = cifs_llseek,
1407 .setlease = cifs_setlease,
1408 .fallocate = cifs_fallocate,
1411 const struct file_operations cifs_dir_ops = {
1412 .iterate_shared = cifs_readdir,
1413 .release = cifs_closedir,
1414 .read = generic_read_dir,
1415 .unlocked_ioctl = cifs_ioctl,
1416 .copy_file_range = cifs_copy_file_range,
1417 .remap_file_range = cifs_remap_file_range,
1418 .llseek = generic_file_llseek,
1419 .fsync = cifs_dir_fsync,
1423 cifs_init_once(void *inode)
1425 struct cifsInodeInfo *cifsi = inode;
1427 inode_init_once(&cifsi->vfs_inode);
1428 init_rwsem(&cifsi->lock_sem);
1432 cifs_init_inodecache(void)
1434 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1435 sizeof(struct cifsInodeInfo),
1436 0, (SLAB_RECLAIM_ACCOUNT|
1437 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1439 if (cifs_inode_cachep == NULL)
1446 cifs_destroy_inodecache(void)
1449 * Make sure all delayed rcu free inodes are flushed before we
1453 kmem_cache_destroy(cifs_inode_cachep);
1457 cifs_init_request_bufs(void)
1460 * SMB2 maximum header size is bigger than CIFS one - no problems to
1461 * allocate some more bytes for CIFS.
1463 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1465 if (CIFSMaxBufSize < 8192) {
1466 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1467 Unicode path name has to fit in any SMB/CIFS path based frames */
1468 CIFSMaxBufSize = 8192;
1469 } else if (CIFSMaxBufSize > 1024*127) {
1470 CIFSMaxBufSize = 1024 * 127;
1472 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1475 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1476 CIFSMaxBufSize, CIFSMaxBufSize);
1478 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1479 CIFSMaxBufSize + max_hdr_size, 0,
1480 SLAB_HWCACHE_ALIGN, 0,
1481 CIFSMaxBufSize + max_hdr_size,
1483 if (cifs_req_cachep == NULL)
1486 if (cifs_min_rcv < 1)
1488 else if (cifs_min_rcv > 64) {
1490 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1493 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1496 if (cifs_req_poolp == NULL) {
1497 kmem_cache_destroy(cifs_req_cachep);
1500 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1501 almost all handle based requests (but not write response, nor is it
1502 sufficient for path based requests). A smaller size would have
1503 been more efficient (compacting multiple slab items on one 4k page)
1504 for the case in which debug was on, but this larger size allows
1505 more SMBs to use small buffer alloc and is still much more
1506 efficient to alloc 1 per page off the slab compared to 17K (5page)
1507 alloc of large cifs buffers even when page debugging is on */
1508 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1509 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1510 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1511 if (cifs_sm_req_cachep == NULL) {
1512 mempool_destroy(cifs_req_poolp);
1513 kmem_cache_destroy(cifs_req_cachep);
1517 if (cifs_min_small < 2)
1519 else if (cifs_min_small > 256) {
1520 cifs_min_small = 256;
1521 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1524 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1525 cifs_sm_req_cachep);
1527 if (cifs_sm_req_poolp == NULL) {
1528 mempool_destroy(cifs_req_poolp);
1529 kmem_cache_destroy(cifs_req_cachep);
1530 kmem_cache_destroy(cifs_sm_req_cachep);
1538 cifs_destroy_request_bufs(void)
1540 mempool_destroy(cifs_req_poolp);
1541 kmem_cache_destroy(cifs_req_cachep);
1542 mempool_destroy(cifs_sm_req_poolp);
1543 kmem_cache_destroy(cifs_sm_req_cachep);
1547 cifs_init_mids(void)
1549 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1550 sizeof(struct mid_q_entry), 0,
1551 SLAB_HWCACHE_ALIGN, NULL);
1552 if (cifs_mid_cachep == NULL)
1555 /* 3 is a reasonable minimum number of simultaneous operations */
1556 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1557 if (cifs_mid_poolp == NULL) {
1558 kmem_cache_destroy(cifs_mid_cachep);
1566 cifs_destroy_mids(void)
1568 mempool_destroy(cifs_mid_poolp);
1569 kmem_cache_destroy(cifs_mid_cachep);
1577 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1579 * Initialize Global counters
1581 atomic_set(&sesInfoAllocCount, 0);
1582 atomic_set(&tconInfoAllocCount, 0);
1583 atomic_set(&tcpSesNextId, 0);
1584 atomic_set(&tcpSesAllocCount, 0);
1585 atomic_set(&tcpSesReconnectCount, 0);
1586 atomic_set(&tconInfoReconnectCount, 0);
1588 atomic_set(&bufAllocCount, 0);
1589 atomic_set(&smBufAllocCount, 0);
1590 #ifdef CONFIG_CIFS_STATS2
1591 atomic_set(&totBufAllocCount, 0);
1592 atomic_set(&totSmBufAllocCount, 0);
1593 if (slow_rsp_threshold < 1)
1594 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1595 else if (slow_rsp_threshold > 32767)
1597 "slow response threshold set higher than recommended (0 to 32767)\n");
1598 #endif /* CONFIG_CIFS_STATS2 */
1600 atomic_set(&midCount, 0);
1601 GlobalCurrentXid = 0;
1602 GlobalTotalActiveXid = 0;
1603 GlobalMaxActiveXid = 0;
1604 spin_lock_init(&cifs_tcp_ses_lock);
1605 spin_lock_init(&GlobalMid_Lock);
1607 cifs_lock_secret = get_random_u32();
1609 if (cifs_max_pending < 2) {
1610 cifs_max_pending = 2;
1611 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1612 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1613 cifs_max_pending = CIFS_MAX_REQ;
1614 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1618 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1621 goto out_clean_proc;
1625 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1626 * so that we don't launch too many worker threads but
1627 * Documentation/core-api/workqueue.rst recommends setting it to 0
1630 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1631 decrypt_wq = alloc_workqueue("smb3decryptd",
1632 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1635 goto out_destroy_cifsiod_wq;
1638 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1639 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1640 if (!fileinfo_put_wq) {
1642 goto out_destroy_decrypt_wq;
1645 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1646 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1647 if (!cifsoplockd_wq) {
1649 goto out_destroy_fileinfo_put_wq;
1652 deferredclose_wq = alloc_workqueue("deferredclose",
1653 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1654 if (!deferredclose_wq) {
1656 goto out_destroy_cifsoplockd_wq;
1659 rc = cifs_fscache_register();
1661 goto out_destroy_deferredclose_wq;
1663 rc = cifs_init_inodecache();
1665 goto out_unreg_fscache;
1667 rc = cifs_init_mids();
1669 goto out_destroy_inodecache;
1671 rc = cifs_init_request_bufs();
1673 goto out_destroy_mids;
1675 #ifdef CONFIG_CIFS_DFS_UPCALL
1676 rc = dfs_cache_init();
1678 goto out_destroy_request_bufs;
1679 #endif /* CONFIG_CIFS_DFS_UPCALL */
1680 #ifdef CONFIG_CIFS_UPCALL
1681 rc = init_cifs_spnego();
1683 goto out_destroy_dfs_cache;
1684 #endif /* CONFIG_CIFS_UPCALL */
1685 #ifdef CONFIG_CIFS_SWN_UPCALL
1686 rc = cifs_genl_init();
1688 goto out_register_key_type;
1689 #endif /* CONFIG_CIFS_SWN_UPCALL */
1691 rc = init_cifs_idmap();
1693 goto out_cifs_swn_init;
1695 rc = register_filesystem(&cifs_fs_type);
1697 goto out_init_cifs_idmap;
1699 rc = register_filesystem(&smb3_fs_type);
1701 unregister_filesystem(&cifs_fs_type);
1702 goto out_init_cifs_idmap;
1707 out_init_cifs_idmap:
1710 #ifdef CONFIG_CIFS_SWN_UPCALL
1712 out_register_key_type:
1714 #ifdef CONFIG_CIFS_UPCALL
1716 out_destroy_dfs_cache:
1718 #ifdef CONFIG_CIFS_DFS_UPCALL
1719 dfs_cache_destroy();
1720 out_destroy_request_bufs:
1722 cifs_destroy_request_bufs();
1724 cifs_destroy_mids();
1725 out_destroy_inodecache:
1726 cifs_destroy_inodecache();
1728 cifs_fscache_unregister();
1729 out_destroy_deferredclose_wq:
1730 destroy_workqueue(deferredclose_wq);
1731 out_destroy_cifsoplockd_wq:
1732 destroy_workqueue(cifsoplockd_wq);
1733 out_destroy_fileinfo_put_wq:
1734 destroy_workqueue(fileinfo_put_wq);
1735 out_destroy_decrypt_wq:
1736 destroy_workqueue(decrypt_wq);
1737 out_destroy_cifsiod_wq:
1738 destroy_workqueue(cifsiod_wq);
1747 cifs_dbg(NOISY, "exit_smb3\n");
1748 unregister_filesystem(&cifs_fs_type);
1749 unregister_filesystem(&smb3_fs_type);
1750 cifs_dfs_release_automount_timer();
1752 #ifdef CONFIG_CIFS_SWN_UPCALL
1755 #ifdef CONFIG_CIFS_UPCALL
1758 #ifdef CONFIG_CIFS_DFS_UPCALL
1759 dfs_cache_destroy();
1761 cifs_destroy_request_bufs();
1762 cifs_destroy_mids();
1763 cifs_destroy_inodecache();
1764 cifs_fscache_unregister();
1765 destroy_workqueue(deferredclose_wq);
1766 destroy_workqueue(cifsoplockd_wq);
1767 destroy_workqueue(decrypt_wq);
1768 destroy_workqueue(fileinfo_put_wq);
1769 destroy_workqueue(cifsiod_wq);
1773 MODULE_AUTHOR("Steve French");
1774 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1776 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1777 "also older servers complying with the SNIA CIFS Specification)");
1778 MODULE_VERSION(CIFS_VERSION);
1779 MODULE_SOFTDEP("ecb");
1780 MODULE_SOFTDEP("hmac");
1781 MODULE_SOFTDEP("md5");
1782 MODULE_SOFTDEP("nls");
1783 MODULE_SOFTDEP("aes");
1784 MODULE_SOFTDEP("cmac");
1785 MODULE_SOFTDEP("sha256");
1786 MODULE_SOFTDEP("sha512");
1787 MODULE_SOFTDEP("aead2");
1788 MODULE_SOFTDEP("ccm");
1789 MODULE_SOFTDEP("gcm");
1790 module_init(init_cifs)
1791 module_exit(exit_cifs)