1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2008
7 * Common Internet FileSystem (CIFS) client
11 /* Note that BB means BUGBUG (ie something to fix eventually) */
13 #include <linux/module.h>
15 #include <linux/mount.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/seq_file.h>
20 #include <linux/vfs.h>
21 #include <linux/mempool.h>
22 #include <linux/delay.h>
23 #include <linux/kthread.h>
24 #include <linux/freezer.h>
25 #include <linux/namei.h>
26 #include <linux/random.h>
27 #include <linux/uuid.h>
28 #include <linux/xattr.h>
29 #include <uapi/linux/magic.h>
33 #define DECLARE_GLOBALS_HERE
35 #include "cifsproto.h"
36 #include "cifs_debug.h"
37 #include "cifs_fs_sb.h"
39 #include <linux/key-type.h>
40 #include "cifs_spnego.h"
42 #ifdef CONFIG_CIFS_DFS_UPCALL
43 #include "dfs_cache.h"
45 #ifdef CONFIG_CIFS_SWN_UPCALL
48 #include "fs_context.h"
51 * DOS dates from 1980/1/1 through 2107/12/31
52 * Protocol specifications indicate the range should be to 119, which
53 * limits maximum year to 2099. But this range has not been checked.
55 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
56 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
57 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
61 bool enable_oplocks = true;
62 bool linuxExtEnabled = true;
63 bool lookupCacheEnabled = true;
64 bool disable_legacy_dialects; /* false by default */
65 bool enable_gcm_256 = true;
66 bool require_gcm_256; /* false by default */
67 bool enable_negotiate_signing; /* false by default */
68 unsigned int global_secflags = CIFSSEC_DEF;
69 /* unsigned int ntlmv2_support = 0; */
70 unsigned int sign_CIFS_PDUs = 1;
71 static const struct super_operations cifs_super_ops;
72 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
73 module_param(CIFSMaxBufSize, uint, 0444);
74 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
76 "Default: 16384 Range: 8192 to 130048");
77 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
78 module_param(cifs_min_rcv, uint, 0444);
79 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
81 unsigned int cifs_min_small = 30;
82 module_param(cifs_min_small, uint, 0444);
83 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
85 unsigned int cifs_max_pending = CIFS_MAX_REQ;
86 module_param(cifs_max_pending, uint, 0444);
87 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
88 "CIFS/SMB1 dialect (N/A for SMB3) "
89 "Default: 32767 Range: 2 to 32767.");
90 #ifdef CONFIG_CIFS_STATS2
91 unsigned int slow_rsp_threshold = 1;
92 module_param(slow_rsp_threshold, uint, 0644);
93 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
94 "before logging that a response is delayed. "
95 "Default: 1 (if set to 0 disables msg).");
98 module_param(enable_oplocks, bool, 0644);
99 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
101 module_param(enable_gcm_256, bool, 0644);
102 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
104 module_param(require_gcm_256, bool, 0644);
105 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
107 module_param(enable_negotiate_signing, bool, 0644);
108 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
110 module_param(disable_legacy_dialects, bool, 0644);
111 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
112 "helpful to restrict the ability to "
113 "override the default dialects (SMB2.1, "
114 "SMB3 and SMB3.02) on mount with old "
115 "dialects (CIFS/SMB1 and SMB2) since "
116 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
117 " and less secure. Default: n/N/0");
119 extern mempool_t *cifs_sm_req_poolp;
120 extern mempool_t *cifs_req_poolp;
121 extern mempool_t *cifs_mid_poolp;
123 struct workqueue_struct *cifsiod_wq;
124 struct workqueue_struct *decrypt_wq;
125 struct workqueue_struct *fileinfo_put_wq;
126 struct workqueue_struct *cifsoplockd_wq;
127 struct workqueue_struct *deferredclose_wq;
128 __u32 cifs_lock_secret;
131 * Bumps refcount for cifs super block.
132 * Note that it should be only called if a referece to VFS super block is
133 * already held, e.g. in open-type syscalls context. Otherwise it can race with
134 * atomic_dec_and_test in deactivate_locked_super.
137 cifs_sb_active(struct super_block *sb)
139 struct cifs_sb_info *server = CIFS_SB(sb);
141 if (atomic_inc_return(&server->active) == 1)
142 atomic_inc(&sb->s_active);
146 cifs_sb_deactive(struct super_block *sb)
148 struct cifs_sb_info *server = CIFS_SB(sb);
150 if (atomic_dec_and_test(&server->active))
151 deactivate_super(sb);
155 cifs_read_super(struct super_block *sb)
158 struct cifs_sb_info *cifs_sb;
159 struct cifs_tcon *tcon;
160 struct timespec64 ts;
163 cifs_sb = CIFS_SB(sb);
164 tcon = cifs_sb_master_tcon(cifs_sb);
166 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
167 sb->s_flags |= SB_POSIXACL;
169 if (tcon->snapshot_time)
170 sb->s_flags |= SB_RDONLY;
172 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
173 sb->s_maxbytes = MAX_LFS_FILESIZE;
175 sb->s_maxbytes = MAX_NON_LFS;
178 * Some very old servers like DOS and OS/2 used 2 second granularity
179 * (while all current servers use 100ns granularity - see MS-DTYP)
180 * but 1 second is the maximum allowed granularity for the VFS
181 * so for old servers set time granularity to 1 second while for
182 * everything else (current servers) set it to 100ns.
184 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
185 ((tcon->ses->capabilities &
186 tcon->ses->server->vals->cap_nt_find) == 0) &&
188 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
189 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
190 sb->s_time_min = ts.tv_sec;
191 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
192 cpu_to_le16(SMB_TIME_MAX), 0);
193 sb->s_time_max = ts.tv_sec;
196 * Almost every server, including all SMB2+, uses DCE TIME
197 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
199 sb->s_time_gran = 100;
200 ts = cifs_NTtimeToUnix(0);
201 sb->s_time_min = ts.tv_sec;
202 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
203 sb->s_time_max = ts.tv_sec;
206 sb->s_magic = CIFS_SUPER_MAGIC;
207 sb->s_op = &cifs_super_ops;
208 sb->s_xattr = cifs_xattr_handlers;
209 rc = super_setup_bdi(sb);
212 /* tune readahead according to rsize if readahead size not set on mount */
213 if (cifs_sb->ctx->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 = alloc_inode_sb(sb, 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);
410 if (inode->i_state & I_PINNING_FSCACHE_WB)
411 cifs_fscache_unuse_inode_cookie(inode, true);
412 cifs_fscache_release_inode_cookie(inode);
417 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
419 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
420 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
422 seq_puts(s, ",addr=");
424 switch (server->dstaddr.ss_family) {
426 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
429 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
430 if (sa6->sin6_scope_id)
431 seq_printf(s, "%%%u", sa6->sin6_scope_id);
434 seq_puts(s, "(unknown)");
437 seq_puts(s, ",rdma");
441 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
443 if (ses->sectype == Unspecified) {
444 if (ses->user_name == NULL)
445 seq_puts(s, ",sec=none");
449 seq_puts(s, ",sec=");
451 switch (ses->sectype) {
453 seq_puts(s, "ntlmv2");
459 seq_puts(s, "ntlmssp");
462 /* shouldn't ever happen */
463 seq_puts(s, "unknown");
470 if (ses->sectype == Kerberos)
471 seq_printf(s, ",cruid=%u",
472 from_kuid_munged(&init_user_ns, ses->cred_uid));
476 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
478 seq_puts(s, ",cache=");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
481 seq_puts(s, "strict");
482 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
484 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
485 seq_puts(s, "singleclient"); /* assume only one client access */
486 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
487 seq_puts(s, "ro"); /* read only caching assumed */
489 seq_puts(s, "loose");
493 * cifs_show_devname() is used so we show the mount device name with correct
494 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
496 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
498 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
499 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
504 convert_delimiter(devname, '/');
505 /* escape all spaces in share names */
506 seq_escape(m, devname, " \t");
513 * cifs_show_options() is for displaying mount options in /proc/mounts.
514 * Not all settable options are displayed but most of the important
518 cifs_show_options(struct seq_file *s, struct dentry *root)
520 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
521 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
522 struct sockaddr *srcaddr;
523 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
525 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
526 cifs_show_security(s, tcon->ses);
527 cifs_show_cache_flavor(s, cifs_sb);
530 seq_puts(s, ",nolease");
531 if (cifs_sb->ctx->multiuser)
532 seq_puts(s, ",multiuser");
533 else if (tcon->ses->user_name)
534 seq_show_option(s, "username", tcon->ses->user_name);
536 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
537 seq_show_option(s, "domain", tcon->ses->domainName);
539 if (srcaddr->sa_family != AF_UNSPEC) {
540 struct sockaddr_in *saddr4;
541 struct sockaddr_in6 *saddr6;
542 saddr4 = (struct sockaddr_in *)srcaddr;
543 saddr6 = (struct sockaddr_in6 *)srcaddr;
544 if (srcaddr->sa_family == AF_INET6)
545 seq_printf(s, ",srcaddr=%pI6c",
547 else if (srcaddr->sa_family == AF_INET)
548 seq_printf(s, ",srcaddr=%pI4",
549 &saddr4->sin_addr.s_addr);
551 seq_printf(s, ",srcaddr=BAD-AF:%i",
552 (int)(srcaddr->sa_family));
555 seq_printf(s, ",uid=%u",
556 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
557 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
558 seq_puts(s, ",forceuid");
560 seq_puts(s, ",noforceuid");
562 seq_printf(s, ",gid=%u",
563 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
564 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
565 seq_puts(s, ",forcegid");
567 seq_puts(s, ",noforcegid");
569 cifs_show_address(s, tcon->ses->server);
572 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
573 cifs_sb->ctx->file_mode,
574 cifs_sb->ctx->dir_mode);
575 if (cifs_sb->ctx->iocharset)
576 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
578 seq_puts(s, ",seal");
579 else if (tcon->ses->server->ignore_signature)
580 seq_puts(s, ",signloosely");
582 seq_puts(s, ",nocase");
584 seq_puts(s, ",nodelete");
585 if (tcon->local_lease)
586 seq_puts(s, ",locallease");
588 seq_puts(s, ",hard");
590 seq_puts(s, ",soft");
591 if (tcon->use_persistent)
592 seq_puts(s, ",persistenthandles");
593 else if (tcon->use_resilient)
594 seq_puts(s, ",resilienthandles");
595 if (tcon->posix_extensions)
596 seq_puts(s, ",posix");
597 else if (tcon->unix_ext)
598 seq_puts(s, ",unix");
600 seq_puts(s, ",nounix");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
602 seq_puts(s, ",nodfs");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
604 seq_puts(s, ",posixpaths");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
606 seq_puts(s, ",setuids");
607 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
608 seq_puts(s, ",idsfromsid");
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
610 seq_puts(s, ",serverino");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
612 seq_puts(s, ",rwpidforward");
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
614 seq_puts(s, ",forcemand");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
616 seq_puts(s, ",nouser_xattr");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
618 seq_puts(s, ",mapchars");
619 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
620 seq_puts(s, ",mapposix");
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
623 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
624 seq_puts(s, ",nobrl");
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
626 seq_puts(s, ",nohandlecache");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
628 seq_puts(s, ",modefromsid");
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
630 seq_puts(s, ",cifsacl");
631 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
632 seq_puts(s, ",dynperm");
633 if (root->d_sb->s_flags & SB_POSIXACL)
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
636 seq_puts(s, ",mfsymlinks");
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
639 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
640 seq_puts(s, ",nostrictsync");
641 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
642 seq_puts(s, ",noperm");
643 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
644 seq_printf(s, ",backupuid=%u",
645 from_kuid_munged(&init_user_ns,
646 cifs_sb->ctx->backupuid));
647 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
648 seq_printf(s, ",backupgid=%u",
649 from_kgid_munged(&init_user_ns,
650 cifs_sb->ctx->backupgid));
652 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
653 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
654 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
655 if (cifs_sb->ctx->rasize)
656 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
657 if (tcon->ses->server->min_offload)
658 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
659 seq_printf(s, ",echo_interval=%lu",
660 tcon->ses->server->echo_interval / HZ);
662 /* Only display max_credits if it was overridden on mount */
663 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
664 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
666 if (tcon->snapshot_time)
667 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
668 if (tcon->handle_timeout)
669 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
672 * Display file and directory attribute timeout in seconds.
673 * If file and directory attribute timeout the same then actimeo
674 * was likely specified on mount
676 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
677 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
679 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
680 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
683 if (tcon->ses->chan_max > 1)
684 seq_printf(s, ",multichannel,max_channels=%zu",
685 tcon->ses->chan_max);
687 if (tcon->use_witness)
688 seq_puts(s, ",witness");
693 static void cifs_umount_begin(struct super_block *sb)
695 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
696 struct cifs_tcon *tcon;
701 tcon = cifs_sb_master_tcon(cifs_sb);
703 spin_lock(&cifs_tcp_ses_lock);
704 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
705 /* we have other mounts to same share or we have
706 already tried to force umount this and woken up
707 all waiting network requests, nothing to do */
708 spin_unlock(&cifs_tcp_ses_lock);
710 } else if (tcon->tc_count == 1)
711 tcon->status = TID_EXITING;
712 spin_unlock(&cifs_tcp_ses_lock);
714 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
715 /* cancel_notify_requests(tcon); */
716 if (tcon->ses && tcon->ses->server) {
717 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
718 wake_up_all(&tcon->ses->server->request_q);
719 wake_up_all(&tcon->ses->server->response_q);
720 msleep(1); /* yield */
721 /* we have to kick the requests once more */
722 wake_up_all(&tcon->ses->server->response_q);
729 #ifdef CONFIG_CIFS_STATS2
730 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
737 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
739 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
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 .write_inode = cifs_write_inode,
756 .free_inode = cifs_free_inode,
757 .drop_inode = cifs_drop_inode,
758 .evict_inode = cifs_evict_inode,
759 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
760 .show_devname = cifs_show_devname,
761 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
762 function unless later we add lazy close of inodes or unless the
763 kernel forgets to call us with the same number of releases (closes)
765 .show_options = cifs_show_options,
766 .umount_begin = cifs_umount_begin,
767 #ifdef CONFIG_CIFS_STATS2
768 .show_stats = cifs_show_stats,
773 * Get root dentry from superblock according to prefix path mount option.
774 * Return dentry with refcount + 1 on success and NULL otherwise.
776 static struct dentry *
777 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
779 struct dentry *dentry;
780 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
781 char *full_path = NULL;
785 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
786 return dget(sb->s_root);
788 full_path = cifs_build_path_to_root(ctx, cifs_sb,
789 cifs_sb_master_tcon(cifs_sb), 0);
790 if (full_path == NULL)
791 return ERR_PTR(-ENOMEM);
793 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
795 sep = CIFS_DIR_SEP(cifs_sb);
796 dentry = dget(sb->s_root);
800 struct inode *dir = d_inode(dentry);
801 struct dentry *child;
803 if (!S_ISDIR(dir->i_mode)) {
805 dentry = ERR_PTR(-ENOTDIR);
809 /* skip separators */
816 while (*s && *s != sep)
819 child = lookup_positive_unlocked(p, dentry, s - p);
822 } while (!IS_ERR(dentry));
827 static int cifs_set_super(struct super_block *sb, void *data)
829 struct cifs_mnt_data *mnt_data = data;
830 sb->s_fs_info = mnt_data->cifs_sb;
831 return set_anon_super(sb, NULL);
835 cifs_smb3_do_mount(struct file_system_type *fs_type,
836 int flags, struct smb3_fs_context *old_ctx)
839 struct super_block *sb;
840 struct cifs_sb_info *cifs_sb = NULL;
841 struct cifs_mnt_data mnt_data;
845 * Prints in Kernel / CIFS log the attempted mount operation
846 * If CIFS_DEBUG && cifs_FYI
849 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
851 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
853 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
854 if (cifs_sb == NULL) {
855 root = ERR_PTR(-ENOMEM);
859 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
861 root = ERR_PTR(-ENOMEM);
864 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
870 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
876 rc = cifs_setup_cifs_sb(cifs_sb);
882 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
884 if (!(flags & SB_SILENT))
885 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
891 mnt_data.ctx = cifs_sb->ctx;
892 mnt_data.cifs_sb = cifs_sb;
893 mnt_data.flags = flags;
895 /* BB should we make this contingent on mount parm? */
896 flags |= SB_NODIRATIME | SB_NOATIME;
898 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
901 cifs_umount(cifs_sb);
907 cifs_dbg(FYI, "Use existing superblock\n");
908 cifs_umount(cifs_sb);
911 rc = cifs_read_super(sb);
917 sb->s_flags |= SB_ACTIVE;
920 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
925 cifs_sb->root = dget(root);
927 cifs_dbg(FYI, "dentry root is: %p\n", root);
931 deactivate_locked_super(sb);
935 kfree(cifs_sb->prepath);
936 smb3_cleanup_fs_context(cifs_sb->ctx);
944 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
947 struct inode *inode = file_inode(iocb->ki_filp);
949 if (iocb->ki_flags & IOCB_DIRECT)
950 return cifs_user_readv(iocb, iter);
952 rc = cifs_revalidate_mapping(inode);
956 return generic_file_read_iter(iocb, iter);
959 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
961 struct inode *inode = file_inode(iocb->ki_filp);
962 struct cifsInodeInfo *cinode = CIFS_I(inode);
966 if (iocb->ki_filp->f_flags & O_DIRECT) {
967 written = cifs_user_writev(iocb, from);
968 if (written > 0 && CIFS_CACHE_READ(cinode)) {
969 cifs_zap_mapping(inode);
971 "Set no oplock for inode=%p after a write operation\n",
978 written = cifs_get_writer(cinode);
982 written = generic_file_write_iter(iocb, from);
984 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
987 rc = filemap_fdatawrite(inode->i_mapping);
989 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
993 cifs_put_writer(cinode);
997 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
999 struct cifsFileInfo *cfile = file->private_data;
1000 struct cifs_tcon *tcon;
1003 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1004 * the cached file length
1006 if (whence != SEEK_SET && whence != SEEK_CUR) {
1008 struct inode *inode = file_inode(file);
1011 * We need to be sure that all dirty pages are written and the
1012 * server has the newest file length.
1014 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1015 inode->i_mapping->nrpages != 0) {
1016 rc = filemap_fdatawait(inode->i_mapping);
1018 mapping_set_error(inode->i_mapping, rc);
1023 * Some applications poll for the file length in this strange
1024 * way so we must seek to end on non-oplocked files by
1025 * setting the revalidate time to zero.
1027 CIFS_I(inode)->time = 0;
1029 rc = cifs_revalidate_file_attr(file);
1033 if (cfile && cfile->tlink) {
1034 tcon = tlink_tcon(cfile->tlink);
1035 if (tcon->ses->server->ops->llseek)
1036 return tcon->ses->server->ops->llseek(file, tcon,
1039 return generic_file_llseek(file, offset, whence);
1043 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1046 * Note that this is called by vfs setlease with i_lock held to
1047 * protect *lease from going away.
1049 struct inode *inode = file_inode(file);
1050 struct cifsFileInfo *cfile = file->private_data;
1052 if (!(S_ISREG(inode->i_mode)))
1055 /* Check if file is oplocked if this is request for new lease */
1056 if (arg == F_UNLCK ||
1057 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1058 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1059 return generic_setlease(file, arg, lease, priv);
1060 else if (tlink_tcon(cfile->tlink)->local_lease &&
1061 !CIFS_CACHE_READ(CIFS_I(inode)))
1063 * If the server claims to support oplock on this file, then we
1064 * still need to check oplock even if the local_lease mount
1065 * option is set, but there are servers which do not support
1066 * oplock for which this mount option may be useful if the user
1067 * knows that the file won't be changed on the server by anyone
1070 return generic_setlease(file, arg, lease, priv);
1075 struct file_system_type cifs_fs_type = {
1076 .owner = THIS_MODULE,
1078 .init_fs_context = smb3_init_fs_context,
1079 .parameters = smb3_fs_parameters,
1080 .kill_sb = cifs_kill_sb,
1081 .fs_flags = FS_RENAME_DOES_D_MOVE,
1083 MODULE_ALIAS_FS("cifs");
1085 static struct file_system_type smb3_fs_type = {
1086 .owner = THIS_MODULE,
1088 .init_fs_context = smb3_init_fs_context,
1089 .parameters = smb3_fs_parameters,
1090 .kill_sb = cifs_kill_sb,
1091 .fs_flags = FS_RENAME_DOES_D_MOVE,
1093 MODULE_ALIAS_FS("smb3");
1094 MODULE_ALIAS("smb3");
1096 const struct inode_operations cifs_dir_inode_ops = {
1097 .create = cifs_create,
1098 .atomic_open = cifs_atomic_open,
1099 .lookup = cifs_lookup,
1100 .getattr = cifs_getattr,
1101 .unlink = cifs_unlink,
1102 .link = cifs_hardlink,
1103 .mkdir = cifs_mkdir,
1104 .rmdir = cifs_rmdir,
1105 .rename = cifs_rename2,
1106 .permission = cifs_permission,
1107 .setattr = cifs_setattr,
1108 .symlink = cifs_symlink,
1109 .mknod = cifs_mknod,
1110 .listxattr = cifs_listxattr,
1113 const struct inode_operations cifs_file_inode_ops = {
1114 .setattr = cifs_setattr,
1115 .getattr = cifs_getattr,
1116 .permission = cifs_permission,
1117 .listxattr = cifs_listxattr,
1118 .fiemap = cifs_fiemap,
1121 const struct inode_operations cifs_symlink_inode_ops = {
1122 .get_link = cifs_get_link,
1123 .permission = cifs_permission,
1124 .listxattr = cifs_listxattr,
1127 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1128 struct file *dst_file, loff_t destoff, loff_t len,
1129 unsigned int remap_flags)
1131 struct inode *src_inode = file_inode(src_file);
1132 struct inode *target_inode = file_inode(dst_file);
1133 struct cifsFileInfo *smb_file_src = src_file->private_data;
1134 struct cifsFileInfo *smb_file_target;
1135 struct cifs_tcon *target_tcon;
1139 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1142 cifs_dbg(FYI, "clone range\n");
1146 if (!src_file->private_data || !dst_file->private_data) {
1148 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1152 smb_file_target = dst_file->private_data;
1153 target_tcon = tlink_tcon(smb_file_target->tlink);
1156 * Note: cifs case is easier than btrfs since server responsible for
1157 * checks for proper open modes and file type and if it wants
1158 * server could even support copy of range where source = target
1160 lock_two_nondirectories(target_inode, src_inode);
1163 len = src_inode->i_size - off;
1165 cifs_dbg(FYI, "about to flush pages\n");
1166 /* should we flush first and last page first */
1167 truncate_inode_pages_range(&target_inode->i_data, destoff,
1168 PAGE_ALIGN(destoff + len)-1);
1170 if (target_tcon->ses->server->ops->duplicate_extents)
1171 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1172 smb_file_src, smb_file_target, off, len, destoff);
1176 /* force revalidate of size and timestamps of target file now
1177 that target is updated on the server */
1178 CIFS_I(target_inode)->time = 0;
1179 /* although unlocking in the reverse order from locking is not
1180 strictly necessary here it is a little cleaner to be consistent */
1181 unlock_two_nondirectories(src_inode, target_inode);
1184 return rc < 0 ? rc : len;
1187 ssize_t cifs_file_copychunk_range(unsigned int xid,
1188 struct file *src_file, loff_t off,
1189 struct file *dst_file, loff_t destoff,
1190 size_t len, unsigned int flags)
1192 struct inode *src_inode = file_inode(src_file);
1193 struct inode *target_inode = file_inode(dst_file);
1194 struct cifsFileInfo *smb_file_src;
1195 struct cifsFileInfo *smb_file_target;
1196 struct cifs_tcon *src_tcon;
1197 struct cifs_tcon *target_tcon;
1200 cifs_dbg(FYI, "copychunk range\n");
1202 if (!src_file->private_data || !dst_file->private_data) {
1204 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1209 smb_file_target = dst_file->private_data;
1210 smb_file_src = src_file->private_data;
1211 src_tcon = tlink_tcon(smb_file_src->tlink);
1212 target_tcon = tlink_tcon(smb_file_target->tlink);
1214 if (src_tcon->ses != target_tcon->ses) {
1215 cifs_dbg(VFS, "source and target of copy not on same server\n");
1220 if (!target_tcon->ses->server->ops->copychunk_range)
1224 * Note: cifs case is easier than btrfs since server responsible for
1225 * checks for proper open modes and file type and if it wants
1226 * server could even support copy of range where source = target
1228 lock_two_nondirectories(target_inode, src_inode);
1230 cifs_dbg(FYI, "about to flush pages\n");
1231 /* should we flush first and last page first */
1232 truncate_inode_pages(&target_inode->i_data, 0);
1234 rc = file_modified(dst_file);
1236 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1237 smb_file_src, smb_file_target, off, len, destoff);
1239 file_accessed(src_file);
1241 /* force revalidate of size and timestamps of target file now
1242 * that target is updated on the server
1244 CIFS_I(target_inode)->time = 0;
1245 /* although unlocking in the reverse order from locking is not
1246 * strictly necessary here it is a little cleaner to be consistent
1248 unlock_two_nondirectories(src_inode, target_inode);
1255 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1256 * is a dummy operation.
1258 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1260 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1266 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1267 struct file *dst_file, loff_t destoff,
1268 size_t len, unsigned int flags)
1270 unsigned int xid = get_xid();
1272 struct cifsFileInfo *cfile = dst_file->private_data;
1274 if (cfile->swapfile)
1277 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1281 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1282 rc = generic_copy_file_range(src_file, off, dst_file,
1283 destoff, len, flags);
1287 const struct file_operations cifs_file_ops = {
1288 .read_iter = cifs_loose_read_iter,
1289 .write_iter = cifs_file_write_iter,
1291 .release = cifs_close,
1293 .flock = cifs_flock,
1294 .fsync = cifs_fsync,
1295 .flush = cifs_flush,
1296 .mmap = cifs_file_mmap,
1297 .splice_read = generic_file_splice_read,
1298 .splice_write = iter_file_splice_write,
1299 .llseek = cifs_llseek,
1300 .unlocked_ioctl = cifs_ioctl,
1301 .copy_file_range = cifs_copy_file_range,
1302 .remap_file_range = cifs_remap_file_range,
1303 .setlease = cifs_setlease,
1304 .fallocate = cifs_fallocate,
1307 const struct file_operations cifs_file_strict_ops = {
1308 .read_iter = cifs_strict_readv,
1309 .write_iter = cifs_strict_writev,
1311 .release = cifs_close,
1313 .flock = cifs_flock,
1314 .fsync = cifs_strict_fsync,
1315 .flush = cifs_flush,
1316 .mmap = cifs_file_strict_mmap,
1317 .splice_read = generic_file_splice_read,
1318 .splice_write = iter_file_splice_write,
1319 .llseek = cifs_llseek,
1320 .unlocked_ioctl = cifs_ioctl,
1321 .copy_file_range = cifs_copy_file_range,
1322 .remap_file_range = cifs_remap_file_range,
1323 .setlease = cifs_setlease,
1324 .fallocate = cifs_fallocate,
1327 const struct file_operations cifs_file_direct_ops = {
1328 .read_iter = cifs_direct_readv,
1329 .write_iter = cifs_direct_writev,
1331 .release = cifs_close,
1333 .flock = cifs_flock,
1334 .fsync = cifs_fsync,
1335 .flush = cifs_flush,
1336 .mmap = cifs_file_mmap,
1337 .splice_read = generic_file_splice_read,
1338 .splice_write = iter_file_splice_write,
1339 .unlocked_ioctl = cifs_ioctl,
1340 .copy_file_range = cifs_copy_file_range,
1341 .remap_file_range = cifs_remap_file_range,
1342 .llseek = cifs_llseek,
1343 .setlease = cifs_setlease,
1344 .fallocate = cifs_fallocate,
1347 const struct file_operations cifs_file_nobrl_ops = {
1348 .read_iter = cifs_loose_read_iter,
1349 .write_iter = cifs_file_write_iter,
1351 .release = cifs_close,
1352 .fsync = cifs_fsync,
1353 .flush = cifs_flush,
1354 .mmap = cifs_file_mmap,
1355 .splice_read = generic_file_splice_read,
1356 .splice_write = iter_file_splice_write,
1357 .llseek = cifs_llseek,
1358 .unlocked_ioctl = cifs_ioctl,
1359 .copy_file_range = cifs_copy_file_range,
1360 .remap_file_range = cifs_remap_file_range,
1361 .setlease = cifs_setlease,
1362 .fallocate = cifs_fallocate,
1365 const struct file_operations cifs_file_strict_nobrl_ops = {
1366 .read_iter = cifs_strict_readv,
1367 .write_iter = cifs_strict_writev,
1369 .release = cifs_close,
1370 .fsync = cifs_strict_fsync,
1371 .flush = cifs_flush,
1372 .mmap = cifs_file_strict_mmap,
1373 .splice_read = generic_file_splice_read,
1374 .splice_write = iter_file_splice_write,
1375 .llseek = cifs_llseek,
1376 .unlocked_ioctl = cifs_ioctl,
1377 .copy_file_range = cifs_copy_file_range,
1378 .remap_file_range = cifs_remap_file_range,
1379 .setlease = cifs_setlease,
1380 .fallocate = cifs_fallocate,
1383 const struct file_operations cifs_file_direct_nobrl_ops = {
1384 .read_iter = cifs_direct_readv,
1385 .write_iter = cifs_direct_writev,
1387 .release = cifs_close,
1388 .fsync = cifs_fsync,
1389 .flush = cifs_flush,
1390 .mmap = cifs_file_mmap,
1391 .splice_read = generic_file_splice_read,
1392 .splice_write = iter_file_splice_write,
1393 .unlocked_ioctl = cifs_ioctl,
1394 .copy_file_range = cifs_copy_file_range,
1395 .remap_file_range = cifs_remap_file_range,
1396 .llseek = cifs_llseek,
1397 .setlease = cifs_setlease,
1398 .fallocate = cifs_fallocate,
1401 const struct file_operations cifs_dir_ops = {
1402 .iterate_shared = cifs_readdir,
1403 .release = cifs_closedir,
1404 .read = generic_read_dir,
1405 .unlocked_ioctl = cifs_ioctl,
1406 .copy_file_range = cifs_copy_file_range,
1407 .remap_file_range = cifs_remap_file_range,
1408 .llseek = generic_file_llseek,
1409 .fsync = cifs_dir_fsync,
1413 cifs_init_once(void *inode)
1415 struct cifsInodeInfo *cifsi = inode;
1417 inode_init_once(&cifsi->vfs_inode);
1418 init_rwsem(&cifsi->lock_sem);
1422 cifs_init_inodecache(void)
1424 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1425 sizeof(struct cifsInodeInfo),
1426 0, (SLAB_RECLAIM_ACCOUNT|
1427 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1429 if (cifs_inode_cachep == NULL)
1436 cifs_destroy_inodecache(void)
1439 * Make sure all delayed rcu free inodes are flushed before we
1443 kmem_cache_destroy(cifs_inode_cachep);
1447 cifs_init_request_bufs(void)
1450 * SMB2 maximum header size is bigger than CIFS one - no problems to
1451 * allocate some more bytes for CIFS.
1453 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1455 if (CIFSMaxBufSize < 8192) {
1456 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1457 Unicode path name has to fit in any SMB/CIFS path based frames */
1458 CIFSMaxBufSize = 8192;
1459 } else if (CIFSMaxBufSize > 1024*127) {
1460 CIFSMaxBufSize = 1024 * 127;
1462 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1465 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1466 CIFSMaxBufSize, CIFSMaxBufSize);
1468 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1469 CIFSMaxBufSize + max_hdr_size, 0,
1470 SLAB_HWCACHE_ALIGN, 0,
1471 CIFSMaxBufSize + max_hdr_size,
1473 if (cifs_req_cachep == NULL)
1476 if (cifs_min_rcv < 1)
1478 else if (cifs_min_rcv > 64) {
1480 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1483 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1486 if (cifs_req_poolp == NULL) {
1487 kmem_cache_destroy(cifs_req_cachep);
1490 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1491 almost all handle based requests (but not write response, nor is it
1492 sufficient for path based requests). A smaller size would have
1493 been more efficient (compacting multiple slab items on one 4k page)
1494 for the case in which debug was on, but this larger size allows
1495 more SMBs to use small buffer alloc and is still much more
1496 efficient to alloc 1 per page off the slab compared to 17K (5page)
1497 alloc of large cifs buffers even when page debugging is on */
1498 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1499 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1500 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1501 if (cifs_sm_req_cachep == NULL) {
1502 mempool_destroy(cifs_req_poolp);
1503 kmem_cache_destroy(cifs_req_cachep);
1507 if (cifs_min_small < 2)
1509 else if (cifs_min_small > 256) {
1510 cifs_min_small = 256;
1511 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1514 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1515 cifs_sm_req_cachep);
1517 if (cifs_sm_req_poolp == NULL) {
1518 mempool_destroy(cifs_req_poolp);
1519 kmem_cache_destroy(cifs_req_cachep);
1520 kmem_cache_destroy(cifs_sm_req_cachep);
1528 cifs_destroy_request_bufs(void)
1530 mempool_destroy(cifs_req_poolp);
1531 kmem_cache_destroy(cifs_req_cachep);
1532 mempool_destroy(cifs_sm_req_poolp);
1533 kmem_cache_destroy(cifs_sm_req_cachep);
1537 cifs_init_mids(void)
1539 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1540 sizeof(struct mid_q_entry), 0,
1541 SLAB_HWCACHE_ALIGN, NULL);
1542 if (cifs_mid_cachep == NULL)
1545 /* 3 is a reasonable minimum number of simultaneous operations */
1546 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1547 if (cifs_mid_poolp == NULL) {
1548 kmem_cache_destroy(cifs_mid_cachep);
1556 cifs_destroy_mids(void)
1558 mempool_destroy(cifs_mid_poolp);
1559 kmem_cache_destroy(cifs_mid_cachep);
1567 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1569 * Initialize Global counters
1571 atomic_set(&sesInfoAllocCount, 0);
1572 atomic_set(&tconInfoAllocCount, 0);
1573 atomic_set(&tcpSesNextId, 0);
1574 atomic_set(&tcpSesAllocCount, 0);
1575 atomic_set(&tcpSesReconnectCount, 0);
1576 atomic_set(&tconInfoReconnectCount, 0);
1578 atomic_set(&bufAllocCount, 0);
1579 atomic_set(&smBufAllocCount, 0);
1580 #ifdef CONFIG_CIFS_STATS2
1581 atomic_set(&totBufAllocCount, 0);
1582 atomic_set(&totSmBufAllocCount, 0);
1583 if (slow_rsp_threshold < 1)
1584 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1585 else if (slow_rsp_threshold > 32767)
1587 "slow response threshold set higher than recommended (0 to 32767)\n");
1588 #endif /* CONFIG_CIFS_STATS2 */
1590 atomic_set(&midCount, 0);
1591 GlobalCurrentXid = 0;
1592 GlobalTotalActiveXid = 0;
1593 GlobalMaxActiveXid = 0;
1594 spin_lock_init(&cifs_tcp_ses_lock);
1595 spin_lock_init(&GlobalMid_Lock);
1597 cifs_lock_secret = get_random_u32();
1599 if (cifs_max_pending < 2) {
1600 cifs_max_pending = 2;
1601 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1602 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1603 cifs_max_pending = CIFS_MAX_REQ;
1604 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1608 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1611 goto out_clean_proc;
1615 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1616 * so that we don't launch too many worker threads but
1617 * Documentation/core-api/workqueue.rst recommends setting it to 0
1620 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1621 decrypt_wq = alloc_workqueue("smb3decryptd",
1622 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1625 goto out_destroy_cifsiod_wq;
1628 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1629 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1630 if (!fileinfo_put_wq) {
1632 goto out_destroy_decrypt_wq;
1635 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1636 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1637 if (!cifsoplockd_wq) {
1639 goto out_destroy_fileinfo_put_wq;
1642 deferredclose_wq = alloc_workqueue("deferredclose",
1643 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1644 if (!deferredclose_wq) {
1646 goto out_destroy_cifsoplockd_wq;
1649 rc = cifs_init_inodecache();
1651 goto out_destroy_deferredclose_wq;
1653 rc = cifs_init_mids();
1655 goto out_destroy_inodecache;
1657 rc = cifs_init_request_bufs();
1659 goto out_destroy_mids;
1661 #ifdef CONFIG_CIFS_DFS_UPCALL
1662 rc = dfs_cache_init();
1664 goto out_destroy_request_bufs;
1665 #endif /* CONFIG_CIFS_DFS_UPCALL */
1666 #ifdef CONFIG_CIFS_UPCALL
1667 rc = init_cifs_spnego();
1669 goto out_destroy_dfs_cache;
1670 #endif /* CONFIG_CIFS_UPCALL */
1671 #ifdef CONFIG_CIFS_SWN_UPCALL
1672 rc = cifs_genl_init();
1674 goto out_register_key_type;
1675 #endif /* CONFIG_CIFS_SWN_UPCALL */
1677 rc = init_cifs_idmap();
1679 goto out_cifs_swn_init;
1681 rc = register_filesystem(&cifs_fs_type);
1683 goto out_init_cifs_idmap;
1685 rc = register_filesystem(&smb3_fs_type);
1687 unregister_filesystem(&cifs_fs_type);
1688 goto out_init_cifs_idmap;
1693 out_init_cifs_idmap:
1696 #ifdef CONFIG_CIFS_SWN_UPCALL
1698 out_register_key_type:
1700 #ifdef CONFIG_CIFS_UPCALL
1702 out_destroy_dfs_cache:
1704 #ifdef CONFIG_CIFS_DFS_UPCALL
1705 dfs_cache_destroy();
1706 out_destroy_request_bufs:
1708 cifs_destroy_request_bufs();
1710 cifs_destroy_mids();
1711 out_destroy_inodecache:
1712 cifs_destroy_inodecache();
1713 out_destroy_deferredclose_wq:
1714 destroy_workqueue(deferredclose_wq);
1715 out_destroy_cifsoplockd_wq:
1716 destroy_workqueue(cifsoplockd_wq);
1717 out_destroy_fileinfo_put_wq:
1718 destroy_workqueue(fileinfo_put_wq);
1719 out_destroy_decrypt_wq:
1720 destroy_workqueue(decrypt_wq);
1721 out_destroy_cifsiod_wq:
1722 destroy_workqueue(cifsiod_wq);
1731 cifs_dbg(NOISY, "exit_smb3\n");
1732 unregister_filesystem(&cifs_fs_type);
1733 unregister_filesystem(&smb3_fs_type);
1734 cifs_dfs_release_automount_timer();
1736 #ifdef CONFIG_CIFS_SWN_UPCALL
1739 #ifdef CONFIG_CIFS_UPCALL
1742 #ifdef CONFIG_CIFS_DFS_UPCALL
1743 dfs_cache_destroy();
1745 cifs_destroy_request_bufs();
1746 cifs_destroy_mids();
1747 cifs_destroy_inodecache();
1748 destroy_workqueue(deferredclose_wq);
1749 destroy_workqueue(cifsoplockd_wq);
1750 destroy_workqueue(decrypt_wq);
1751 destroy_workqueue(fileinfo_put_wq);
1752 destroy_workqueue(cifsiod_wq);
1756 MODULE_AUTHOR("Steve French");
1757 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1759 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1760 "also older servers complying with the SNIA CIFS Specification)");
1761 MODULE_VERSION(CIFS_VERSION);
1762 MODULE_SOFTDEP("ecb");
1763 MODULE_SOFTDEP("hmac");
1764 MODULE_SOFTDEP("md5");
1765 MODULE_SOFTDEP("nls");
1766 MODULE_SOFTDEP("aes");
1767 MODULE_SOFTDEP("cmac");
1768 MODULE_SOFTDEP("sha256");
1769 MODULE_SOFTDEP("sha512");
1770 MODULE_SOFTDEP("aead2");
1771 MODULE_SOFTDEP("ccm");
1772 MODULE_SOFTDEP("gcm");
1773 module_init(init_cifs)
1774 module_exit(exit_cifs)