4 * Copyright (C) International Business Machines Corp., 2002,2008
7 * Common Internet FileSystem (CIFS) client
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
38 #include <linux/namei.h>
39 #include <linux/random.h>
40 #include <linux/uuid.h>
41 #include <linux/xattr.h>
45 #define DECLARE_GLOBALS_HERE
47 #include "cifsproto.h"
48 #include "cifs_debug.h"
49 #include "cifs_fs_sb.h"
51 #include <linux/key-type.h>
52 #include "cifs_spnego.h"
55 #ifdef CONFIG_CIFS_DFS_UPCALL
56 #include "dfs_cache.h"
58 #ifdef CONFIG_CIFS_SWN_UPCALL
61 #include "fs_context.h"
64 * DOS dates from 1980/1/1 through 2107/12/31
65 * Protocol specifications indicate the range should be to 119, which
66 * limits maximum year to 2099. But this range has not been checked.
68 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
69 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
70 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
74 bool enable_oplocks = true;
75 bool linuxExtEnabled = true;
76 bool lookupCacheEnabled = true;
77 bool disable_legacy_dialects; /* false by default */
78 bool enable_gcm_256; /* false by default, change when more servers support it */
79 bool require_gcm_256; /* false by default */
80 unsigned int global_secflags = CIFSSEC_DEF;
81 /* unsigned int ntlmv2_support = 0; */
82 unsigned int sign_CIFS_PDUs = 1;
83 static const struct super_operations cifs_super_ops;
84 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
85 module_param(CIFSMaxBufSize, uint, 0444);
86 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
88 "Default: 16384 Range: 8192 to 130048");
89 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
90 module_param(cifs_min_rcv, uint, 0444);
91 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
93 unsigned int cifs_min_small = 30;
94 module_param(cifs_min_small, uint, 0444);
95 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
97 unsigned int cifs_max_pending = CIFS_MAX_REQ;
98 module_param(cifs_max_pending, uint, 0444);
99 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
100 "CIFS/SMB1 dialect (N/A for SMB3) "
101 "Default: 32767 Range: 2 to 32767.");
102 #ifdef CONFIG_CIFS_STATS2
103 unsigned int slow_rsp_threshold = 1;
104 module_param(slow_rsp_threshold, uint, 0644);
105 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
106 "before logging that a response is delayed. "
107 "Default: 1 (if set to 0 disables msg).");
110 module_param(enable_oplocks, bool, 0644);
111 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
113 module_param(enable_gcm_256, bool, 0644);
114 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
116 module_param(require_gcm_256, bool, 0644);
117 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
119 module_param(disable_legacy_dialects, bool, 0644);
120 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
121 "helpful to restrict the ability to "
122 "override the default dialects (SMB2.1, "
123 "SMB3 and SMB3.02) on mount with old "
124 "dialects (CIFS/SMB1 and SMB2) since "
125 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
126 " and less secure. Default: n/N/0");
128 extern mempool_t *cifs_sm_req_poolp;
129 extern mempool_t *cifs_req_poolp;
130 extern mempool_t *cifs_mid_poolp;
132 struct workqueue_struct *cifsiod_wq;
133 struct workqueue_struct *decrypt_wq;
134 struct workqueue_struct *fileinfo_put_wq;
135 struct workqueue_struct *cifsoplockd_wq;
136 __u32 cifs_lock_secret;
139 * Bumps refcount for cifs super block.
140 * Note that it should be only called if a referece to VFS super block is
141 * already held, e.g. in open-type syscalls context. Otherwise it can race with
142 * atomic_dec_and_test in deactivate_locked_super.
145 cifs_sb_active(struct super_block *sb)
147 struct cifs_sb_info *server = CIFS_SB(sb);
149 if (atomic_inc_return(&server->active) == 1)
150 atomic_inc(&sb->s_active);
154 cifs_sb_deactive(struct super_block *sb)
156 struct cifs_sb_info *server = CIFS_SB(sb);
158 if (atomic_dec_and_test(&server->active))
159 deactivate_super(sb);
163 cifs_read_super(struct super_block *sb)
166 struct cifs_sb_info *cifs_sb;
167 struct cifs_tcon *tcon;
168 struct timespec64 ts;
171 cifs_sb = CIFS_SB(sb);
172 tcon = cifs_sb_master_tcon(cifs_sb);
174 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
175 sb->s_flags |= SB_POSIXACL;
177 if (tcon->snapshot_time)
178 sb->s_flags |= SB_RDONLY;
180 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
181 sb->s_maxbytes = MAX_LFS_FILESIZE;
183 sb->s_maxbytes = MAX_NON_LFS;
186 * Some very old servers like DOS and OS/2 used 2 second granularity
187 * (while all current servers use 100ns granularity - see MS-DTYP)
188 * but 1 second is the maximum allowed granularity for the VFS
189 * so for old servers set time granularity to 1 second while for
190 * everything else (current servers) set it to 100ns.
192 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
193 ((tcon->ses->capabilities &
194 tcon->ses->server->vals->cap_nt_find) == 0) &&
196 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
197 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
198 sb->s_time_min = ts.tv_sec;
199 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
200 cpu_to_le16(SMB_TIME_MAX), 0);
201 sb->s_time_max = ts.tv_sec;
204 * Almost every server, including all SMB2+, uses DCE TIME
205 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
207 sb->s_time_gran = 100;
208 ts = cifs_NTtimeToUnix(0);
209 sb->s_time_min = ts.tv_sec;
210 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
211 sb->s_time_max = ts.tv_sec;
214 sb->s_magic = CIFS_MAGIC_NUMBER;
215 sb->s_op = &cifs_super_ops;
216 sb->s_xattr = cifs_xattr_handlers;
217 rc = super_setup_bdi(sb);
220 /* tune readahead according to rsize */
221 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
223 sb->s_blocksize = CIFS_MAX_MSGSIZE;
224 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
225 inode = cifs_root_iget(sb);
233 sb->s_d_op = &cifs_ci_dentry_ops;
235 sb->s_d_op = &cifs_dentry_ops;
237 sb->s_root = d_make_root(inode);
243 #ifdef CONFIG_CIFS_NFSD_EXPORT
244 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
245 cifs_dbg(FYI, "export ops supported\n");
246 sb->s_export_op = &cifs_export_ops;
248 #endif /* CONFIG_CIFS_NFSD_EXPORT */
253 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
257 static void cifs_kill_sb(struct super_block *sb)
259 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
261 cifs_umount(cifs_sb);
265 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
267 struct super_block *sb = dentry->d_sb;
268 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
269 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
270 struct TCP_Server_Info *server = tcon->ses->server;
276 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
278 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
280 buf->f_namelen = PATH_MAX;
282 buf->f_fsid.val[0] = tcon->vol_serial_number;
283 /* are using part of create time for more randomness, see man statfs */
284 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
286 buf->f_files = 0; /* undefined */
287 buf->f_ffree = 0; /* unlimited */
289 if (server->ops->queryfs)
290 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
296 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
298 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
299 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
300 struct TCP_Server_Info *server = tcon->ses->server;
302 if (server->ops->fallocate)
303 return server->ops->fallocate(file, tcon, mode, off, len);
308 static int cifs_permission(struct user_namespace *mnt_userns,
309 struct inode *inode, int mask)
311 struct cifs_sb_info *cifs_sb;
313 cifs_sb = CIFS_SB(inode->i_sb);
315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
316 if ((mask & MAY_EXEC) && !execute_ok(inode))
320 } else /* file mode might have been restricted at mount time
321 on the client (above and beyond ACL on servers) for
322 servers which do not support setting and viewing mode bits,
323 so allowing client to check permissions is useful */
324 return generic_permission(&init_user_ns, inode, mask);
327 static struct kmem_cache *cifs_inode_cachep;
328 static struct kmem_cache *cifs_req_cachep;
329 static struct kmem_cache *cifs_mid_cachep;
330 static struct kmem_cache *cifs_sm_req_cachep;
331 mempool_t *cifs_sm_req_poolp;
332 mempool_t *cifs_req_poolp;
333 mempool_t *cifs_mid_poolp;
335 static struct inode *
336 cifs_alloc_inode(struct super_block *sb)
338 struct cifsInodeInfo *cifs_inode;
339 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
342 cifs_inode->cifsAttrs = 0x20; /* default */
343 cifs_inode->time = 0;
345 * Until the file is open and we have gotten oplock info back from the
346 * server, can not assume caching of file data or metadata.
348 cifs_set_oplock_level(cifs_inode, 0);
349 cifs_inode->flags = 0;
350 spin_lock_init(&cifs_inode->writers_lock);
351 cifs_inode->writers = 0;
352 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
353 cifs_inode->server_eof = 0;
354 cifs_inode->uniqueid = 0;
355 cifs_inode->createtime = 0;
356 cifs_inode->epoch = 0;
357 spin_lock_init(&cifs_inode->open_file_lock);
358 generate_random_uuid(cifs_inode->lease_key);
361 * Can not set i_flags here - they get immediately overwritten to zero
364 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
365 INIT_LIST_HEAD(&cifs_inode->openFileList);
366 INIT_LIST_HEAD(&cifs_inode->llist);
367 return &cifs_inode->vfs_inode;
371 cifs_free_inode(struct inode *inode)
373 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
377 cifs_evict_inode(struct inode *inode)
379 truncate_inode_pages_final(&inode->i_data);
381 cifs_fscache_release_inode_cookie(inode);
385 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
387 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
388 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
390 seq_puts(s, ",addr=");
392 switch (server->dstaddr.ss_family) {
394 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
397 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
398 if (sa6->sin6_scope_id)
399 seq_printf(s, "%%%u", sa6->sin6_scope_id);
402 seq_puts(s, "(unknown)");
405 seq_puts(s, ",rdma");
409 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
411 if (ses->sectype == Unspecified) {
412 if (ses->user_name == NULL)
413 seq_puts(s, ",sec=none");
417 seq_puts(s, ",sec=");
419 switch (ses->sectype) {
421 seq_puts(s, "lanman");
424 seq_puts(s, "ntlmv2");
433 seq_puts(s, "ntlmssp");
436 /* shouldn't ever happen */
437 seq_puts(s, "unknown");
444 if (ses->sectype == Kerberos)
445 seq_printf(s, ",cruid=%u",
446 from_kuid_munged(&init_user_ns, ses->cred_uid));
450 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
452 seq_puts(s, ",cache=");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
455 seq_puts(s, "strict");
456 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
458 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
459 seq_puts(s, "singleclient"); /* assume only one client access */
460 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
461 seq_puts(s, "ro"); /* read only caching assumed */
463 seq_puts(s, "loose");
467 * cifs_show_devname() is used so we show the mount device name with correct
468 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
470 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
472 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
473 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
478 convert_delimiter(devname, '/');
479 seq_puts(m, devname);
486 * cifs_show_options() is for displaying mount options in /proc/mounts.
487 * Not all settable options are displayed but most of the important
491 cifs_show_options(struct seq_file *s, struct dentry *root)
493 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
494 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
495 struct sockaddr *srcaddr;
496 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
498 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
499 cifs_show_security(s, tcon->ses);
500 cifs_show_cache_flavor(s, cifs_sb);
503 seq_puts(s, ",nolease");
504 if (cifs_sb->ctx->multiuser)
505 seq_puts(s, ",multiuser");
506 else if (tcon->ses->user_name)
507 seq_show_option(s, "username", tcon->ses->user_name);
509 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
510 seq_show_option(s, "domain", tcon->ses->domainName);
512 if (srcaddr->sa_family != AF_UNSPEC) {
513 struct sockaddr_in *saddr4;
514 struct sockaddr_in6 *saddr6;
515 saddr4 = (struct sockaddr_in *)srcaddr;
516 saddr6 = (struct sockaddr_in6 *)srcaddr;
517 if (srcaddr->sa_family == AF_INET6)
518 seq_printf(s, ",srcaddr=%pI6c",
520 else if (srcaddr->sa_family == AF_INET)
521 seq_printf(s, ",srcaddr=%pI4",
522 &saddr4->sin_addr.s_addr);
524 seq_printf(s, ",srcaddr=BAD-AF:%i",
525 (int)(srcaddr->sa_family));
528 seq_printf(s, ",uid=%u",
529 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
530 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
531 seq_puts(s, ",forceuid");
533 seq_puts(s, ",noforceuid");
535 seq_printf(s, ",gid=%u",
536 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
537 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
538 seq_puts(s, ",forcegid");
540 seq_puts(s, ",noforcegid");
542 cifs_show_address(s, tcon->ses->server);
545 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
546 cifs_sb->ctx->file_mode,
547 cifs_sb->ctx->dir_mode);
548 if (cifs_sb->ctx->iocharset)
549 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
551 seq_puts(s, ",seal");
552 else if (tcon->ses->server->ignore_signature)
553 seq_puts(s, ",signloosely");
555 seq_puts(s, ",nocase");
557 seq_puts(s, ",nodelete");
558 if (tcon->local_lease)
559 seq_puts(s, ",locallease");
561 seq_puts(s, ",hard");
563 seq_puts(s, ",soft");
564 if (tcon->use_persistent)
565 seq_puts(s, ",persistenthandles");
566 else if (tcon->use_resilient)
567 seq_puts(s, ",resilienthandles");
568 if (tcon->posix_extensions)
569 seq_puts(s, ",posix");
570 else if (tcon->unix_ext)
571 seq_puts(s, ",unix");
573 seq_puts(s, ",nounix");
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
575 seq_puts(s, ",nodfs");
576 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
577 seq_puts(s, ",posixpaths");
578 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
579 seq_puts(s, ",setuids");
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
581 seq_puts(s, ",idsfromsid");
582 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
583 seq_puts(s, ",serverino");
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
585 seq_puts(s, ",rwpidforward");
586 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
587 seq_puts(s, ",forcemand");
588 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
589 seq_puts(s, ",nouser_xattr");
590 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
591 seq_puts(s, ",mapchars");
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
593 seq_puts(s, ",mapposix");
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
597 seq_puts(s, ",nobrl");
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
599 seq_puts(s, ",nohandlecache");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
601 seq_puts(s, ",modefromsid");
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
603 seq_puts(s, ",cifsacl");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
605 seq_puts(s, ",dynperm");
606 if (root->d_sb->s_flags & SB_POSIXACL)
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
609 seq_puts(s, ",mfsymlinks");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
613 seq_puts(s, ",nostrictsync");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
615 seq_puts(s, ",noperm");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
617 seq_printf(s, ",backupuid=%u",
618 from_kuid_munged(&init_user_ns,
619 cifs_sb->ctx->backupuid));
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
621 seq_printf(s, ",backupgid=%u",
622 from_kgid_munged(&init_user_ns,
623 cifs_sb->ctx->backupgid));
625 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
626 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
627 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
628 if (tcon->ses->server->min_offload)
629 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
630 seq_printf(s, ",echo_interval=%lu",
631 tcon->ses->server->echo_interval / HZ);
633 /* Only display max_credits if it was overridden on mount */
634 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
635 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
637 if (tcon->snapshot_time)
638 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
639 if (tcon->handle_timeout)
640 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
643 * Display file and directory attribute timeout in seconds.
644 * If file and directory attribute timeout the same then actimeo
645 * was likely specified on mount
647 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
648 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
650 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
651 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
654 if (tcon->ses->chan_max > 1)
655 seq_printf(s, ",multichannel,max_channels=%zu",
656 tcon->ses->chan_max);
658 #ifdef CONFIG_CIFS_SWN_UPCALL
659 if (tcon->use_witness)
660 seq_puts(s, ",witness");
666 static void cifs_umount_begin(struct super_block *sb)
668 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
669 struct cifs_tcon *tcon;
674 tcon = cifs_sb_master_tcon(cifs_sb);
676 spin_lock(&cifs_tcp_ses_lock);
677 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
678 /* we have other mounts to same share or we have
679 already tried to force umount this and woken up
680 all waiting network requests, nothing to do */
681 spin_unlock(&cifs_tcp_ses_lock);
683 } else if (tcon->tc_count == 1)
684 tcon->tidStatus = CifsExiting;
685 spin_unlock(&cifs_tcp_ses_lock);
687 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
688 /* cancel_notify_requests(tcon); */
689 if (tcon->ses && tcon->ses->server) {
690 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
691 wake_up_all(&tcon->ses->server->request_q);
692 wake_up_all(&tcon->ses->server->response_q);
693 msleep(1); /* yield */
694 /* we have to kick the requests once more */
695 wake_up_all(&tcon->ses->server->response_q);
702 #ifdef CONFIG_CIFS_STATS2
703 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
710 static int cifs_drop_inode(struct inode *inode)
712 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
714 /* no serverino => unconditional eviction */
715 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
716 generic_drop_inode(inode);
719 static const struct super_operations cifs_super_ops = {
720 .statfs = cifs_statfs,
721 .alloc_inode = cifs_alloc_inode,
722 .free_inode = cifs_free_inode,
723 .drop_inode = cifs_drop_inode,
724 .evict_inode = cifs_evict_inode,
725 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
726 .show_devname = cifs_show_devname,
727 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
728 function unless later we add lazy close of inodes or unless the
729 kernel forgets to call us with the same number of releases (closes)
731 .show_options = cifs_show_options,
732 .umount_begin = cifs_umount_begin,
733 #ifdef CONFIG_CIFS_STATS2
734 .show_stats = cifs_show_stats,
739 * Get root dentry from superblock according to prefix path mount option.
740 * Return dentry with refcount + 1 on success and NULL otherwise.
742 static struct dentry *
743 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
745 struct dentry *dentry;
746 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
747 char *full_path = NULL;
751 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
752 return dget(sb->s_root);
754 full_path = cifs_build_path_to_root(ctx, cifs_sb,
755 cifs_sb_master_tcon(cifs_sb), 0);
756 if (full_path == NULL)
757 return ERR_PTR(-ENOMEM);
759 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
761 sep = CIFS_DIR_SEP(cifs_sb);
762 dentry = dget(sb->s_root);
766 struct inode *dir = d_inode(dentry);
767 struct dentry *child;
769 if (!S_ISDIR(dir->i_mode)) {
771 dentry = ERR_PTR(-ENOTDIR);
775 /* skip separators */
782 while (*s && *s != sep)
785 child = lookup_positive_unlocked(p, dentry, s - p);
788 } while (!IS_ERR(dentry));
793 static int cifs_set_super(struct super_block *sb, void *data)
795 struct cifs_mnt_data *mnt_data = data;
796 sb->s_fs_info = mnt_data->cifs_sb;
797 return set_anon_super(sb, NULL);
801 cifs_smb3_do_mount(struct file_system_type *fs_type,
802 int flags, struct smb3_fs_context *old_ctx)
805 struct super_block *sb;
806 struct cifs_sb_info *cifs_sb = NULL;
807 struct cifs_mnt_data mnt_data;
811 * Prints in Kernel / CIFS log the attempted mount operation
812 * If CIFS_DEBUG && cifs_FYI
815 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
817 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
819 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
820 if (cifs_sb == NULL) {
821 root = ERR_PTR(-ENOMEM);
825 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
827 root = ERR_PTR(-ENOMEM);
830 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
836 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC);
842 rc = cifs_setup_cifs_sb(cifs_sb);
848 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
850 if (!(flags & SB_SILENT))
851 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
857 mnt_data.ctx = cifs_sb->ctx;
858 mnt_data.cifs_sb = cifs_sb;
859 mnt_data.flags = flags;
861 /* BB should we make this contingent on mount parm? */
862 flags |= SB_NODIRATIME | SB_NOATIME;
864 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
867 cifs_umount(cifs_sb);
873 cifs_dbg(FYI, "Use existing superblock\n");
874 cifs_umount(cifs_sb);
877 rc = cifs_read_super(sb);
883 sb->s_flags |= SB_ACTIVE;
886 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
890 cifs_dbg(FYI, "dentry root is: %p\n", root);
894 deactivate_locked_super(sb);
897 kfree(cifs_sb->prepath);
898 smb3_cleanup_fs_context(cifs_sb->ctx);
906 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
909 struct inode *inode = file_inode(iocb->ki_filp);
911 if (iocb->ki_filp->f_flags & O_DIRECT)
912 return cifs_user_readv(iocb, iter);
914 rc = cifs_revalidate_mapping(inode);
918 return generic_file_read_iter(iocb, iter);
921 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
923 struct inode *inode = file_inode(iocb->ki_filp);
924 struct cifsInodeInfo *cinode = CIFS_I(inode);
928 if (iocb->ki_filp->f_flags & O_DIRECT) {
929 written = cifs_user_writev(iocb, from);
930 if (written > 0 && CIFS_CACHE_READ(cinode)) {
931 cifs_zap_mapping(inode);
933 "Set no oplock for inode=%p after a write operation\n",
940 written = cifs_get_writer(cinode);
944 written = generic_file_write_iter(iocb, from);
946 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
949 rc = filemap_fdatawrite(inode->i_mapping);
951 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
955 cifs_put_writer(cinode);
959 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
961 struct cifsFileInfo *cfile = file->private_data;
962 struct cifs_tcon *tcon;
965 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
966 * the cached file length
968 if (whence != SEEK_SET && whence != SEEK_CUR) {
970 struct inode *inode = file_inode(file);
973 * We need to be sure that all dirty pages are written and the
974 * server has the newest file length.
976 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
977 inode->i_mapping->nrpages != 0) {
978 rc = filemap_fdatawait(inode->i_mapping);
980 mapping_set_error(inode->i_mapping, rc);
985 * Some applications poll for the file length in this strange
986 * way so we must seek to end on non-oplocked files by
987 * setting the revalidate time to zero.
989 CIFS_I(inode)->time = 0;
991 rc = cifs_revalidate_file_attr(file);
995 if (cfile && cfile->tlink) {
996 tcon = tlink_tcon(cfile->tlink);
997 if (tcon->ses->server->ops->llseek)
998 return tcon->ses->server->ops->llseek(file, tcon,
1001 return generic_file_llseek(file, offset, whence);
1005 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1008 * Note that this is called by vfs setlease with i_lock held to
1009 * protect *lease from going away.
1011 struct inode *inode = file_inode(file);
1012 struct cifsFileInfo *cfile = file->private_data;
1014 if (!(S_ISREG(inode->i_mode)))
1017 /* Check if file is oplocked if this is request for new lease */
1018 if (arg == F_UNLCK ||
1019 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1020 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1021 return generic_setlease(file, arg, lease, priv);
1022 else if (tlink_tcon(cfile->tlink)->local_lease &&
1023 !CIFS_CACHE_READ(CIFS_I(inode)))
1025 * If the server claims to support oplock on this file, then we
1026 * still need to check oplock even if the local_lease mount
1027 * option is set, but there are servers which do not support
1028 * oplock for which this mount option may be useful if the user
1029 * knows that the file won't be changed on the server by anyone
1032 return generic_setlease(file, arg, lease, priv);
1037 struct file_system_type cifs_fs_type = {
1038 .owner = THIS_MODULE,
1040 .init_fs_context = smb3_init_fs_context,
1041 .parameters = smb3_fs_parameters,
1042 .kill_sb = cifs_kill_sb,
1043 .fs_flags = FS_RENAME_DOES_D_MOVE,
1045 MODULE_ALIAS_FS("cifs");
1047 static struct file_system_type smb3_fs_type = {
1048 .owner = THIS_MODULE,
1050 .init_fs_context = smb3_init_fs_context,
1051 .parameters = smb3_fs_parameters,
1052 .kill_sb = cifs_kill_sb,
1053 .fs_flags = FS_RENAME_DOES_D_MOVE,
1055 MODULE_ALIAS_FS("smb3");
1056 MODULE_ALIAS("smb3");
1058 const struct inode_operations cifs_dir_inode_ops = {
1059 .create = cifs_create,
1060 .atomic_open = cifs_atomic_open,
1061 .lookup = cifs_lookup,
1062 .getattr = cifs_getattr,
1063 .unlink = cifs_unlink,
1064 .link = cifs_hardlink,
1065 .mkdir = cifs_mkdir,
1066 .rmdir = cifs_rmdir,
1067 .rename = cifs_rename2,
1068 .permission = cifs_permission,
1069 .setattr = cifs_setattr,
1070 .symlink = cifs_symlink,
1071 .mknod = cifs_mknod,
1072 .listxattr = cifs_listxattr,
1075 const struct inode_operations cifs_file_inode_ops = {
1076 .setattr = cifs_setattr,
1077 .getattr = cifs_getattr,
1078 .permission = cifs_permission,
1079 .listxattr = cifs_listxattr,
1080 .fiemap = cifs_fiemap,
1083 const struct inode_operations cifs_symlink_inode_ops = {
1084 .get_link = cifs_get_link,
1085 .permission = cifs_permission,
1086 .listxattr = cifs_listxattr,
1089 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1090 struct file *dst_file, loff_t destoff, loff_t len,
1091 unsigned int remap_flags)
1093 struct inode *src_inode = file_inode(src_file);
1094 struct inode *target_inode = file_inode(dst_file);
1095 struct cifsFileInfo *smb_file_src = src_file->private_data;
1096 struct cifsFileInfo *smb_file_target;
1097 struct cifs_tcon *target_tcon;
1101 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1104 cifs_dbg(FYI, "clone range\n");
1108 if (!src_file->private_data || !dst_file->private_data) {
1110 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1114 smb_file_target = dst_file->private_data;
1115 target_tcon = tlink_tcon(smb_file_target->tlink);
1118 * Note: cifs case is easier than btrfs since server responsible for
1119 * checks for proper open modes and file type and if it wants
1120 * server could even support copy of range where source = target
1122 lock_two_nondirectories(target_inode, src_inode);
1125 len = src_inode->i_size - off;
1127 cifs_dbg(FYI, "about to flush pages\n");
1128 /* should we flush first and last page first */
1129 truncate_inode_pages_range(&target_inode->i_data, destoff,
1130 PAGE_ALIGN(destoff + len)-1);
1132 if (target_tcon->ses->server->ops->duplicate_extents)
1133 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1134 smb_file_src, smb_file_target, off, len, destoff);
1138 /* force revalidate of size and timestamps of target file now
1139 that target is updated on the server */
1140 CIFS_I(target_inode)->time = 0;
1141 /* although unlocking in the reverse order from locking is not
1142 strictly necessary here it is a little cleaner to be consistent */
1143 unlock_two_nondirectories(src_inode, target_inode);
1146 return rc < 0 ? rc : len;
1149 ssize_t cifs_file_copychunk_range(unsigned int xid,
1150 struct file *src_file, loff_t off,
1151 struct file *dst_file, loff_t destoff,
1152 size_t len, unsigned int flags)
1154 struct inode *src_inode = file_inode(src_file);
1155 struct inode *target_inode = file_inode(dst_file);
1156 struct cifsFileInfo *smb_file_src;
1157 struct cifsFileInfo *smb_file_target;
1158 struct cifs_tcon *src_tcon;
1159 struct cifs_tcon *target_tcon;
1162 cifs_dbg(FYI, "copychunk range\n");
1164 if (!src_file->private_data || !dst_file->private_data) {
1166 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1171 smb_file_target = dst_file->private_data;
1172 smb_file_src = src_file->private_data;
1173 src_tcon = tlink_tcon(smb_file_src->tlink);
1174 target_tcon = tlink_tcon(smb_file_target->tlink);
1176 if (src_tcon->ses != target_tcon->ses) {
1177 cifs_dbg(VFS, "source and target of copy not on same server\n");
1182 if (!target_tcon->ses->server->ops->copychunk_range)
1186 * Note: cifs case is easier than btrfs since server responsible for
1187 * checks for proper open modes and file type and if it wants
1188 * server could even support copy of range where source = target
1190 lock_two_nondirectories(target_inode, src_inode);
1192 cifs_dbg(FYI, "about to flush pages\n");
1193 /* should we flush first and last page first */
1194 truncate_inode_pages(&target_inode->i_data, 0);
1196 rc = file_modified(dst_file);
1198 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1199 smb_file_src, smb_file_target, off, len, destoff);
1201 file_accessed(src_file);
1203 /* force revalidate of size and timestamps of target file now
1204 * that target is updated on the server
1206 CIFS_I(target_inode)->time = 0;
1207 /* although unlocking in the reverse order from locking is not
1208 * strictly necessary here it is a little cleaner to be consistent
1210 unlock_two_nondirectories(src_inode, target_inode);
1217 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1218 * is a dummy operation.
1220 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1222 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1228 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1229 struct file *dst_file, loff_t destoff,
1230 size_t len, unsigned int flags)
1232 unsigned int xid = get_xid();
1234 struct cifsFileInfo *cfile = dst_file->private_data;
1236 if (cfile->swapfile)
1239 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1243 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1244 rc = generic_copy_file_range(src_file, off, dst_file,
1245 destoff, len, flags);
1249 const struct file_operations cifs_file_ops = {
1250 .read_iter = cifs_loose_read_iter,
1251 .write_iter = cifs_file_write_iter,
1253 .release = cifs_close,
1255 .flock = cifs_flock,
1256 .fsync = cifs_fsync,
1257 .flush = cifs_flush,
1258 .mmap = cifs_file_mmap,
1259 .splice_read = generic_file_splice_read,
1260 .splice_write = iter_file_splice_write,
1261 .llseek = cifs_llseek,
1262 .unlocked_ioctl = cifs_ioctl,
1263 .copy_file_range = cifs_copy_file_range,
1264 .remap_file_range = cifs_remap_file_range,
1265 .setlease = cifs_setlease,
1266 .fallocate = cifs_fallocate,
1269 const struct file_operations cifs_file_strict_ops = {
1270 .read_iter = cifs_strict_readv,
1271 .write_iter = cifs_strict_writev,
1273 .release = cifs_close,
1275 .flock = cifs_flock,
1276 .fsync = cifs_strict_fsync,
1277 .flush = cifs_flush,
1278 .mmap = cifs_file_strict_mmap,
1279 .splice_read = generic_file_splice_read,
1280 .splice_write = iter_file_splice_write,
1281 .llseek = cifs_llseek,
1282 .unlocked_ioctl = cifs_ioctl,
1283 .copy_file_range = cifs_copy_file_range,
1284 .remap_file_range = cifs_remap_file_range,
1285 .setlease = cifs_setlease,
1286 .fallocate = cifs_fallocate,
1289 const struct file_operations cifs_file_direct_ops = {
1290 .read_iter = cifs_direct_readv,
1291 .write_iter = cifs_direct_writev,
1293 .release = cifs_close,
1295 .flock = cifs_flock,
1296 .fsync = cifs_fsync,
1297 .flush = cifs_flush,
1298 .mmap = cifs_file_mmap,
1299 .splice_read = generic_file_splice_read,
1300 .splice_write = iter_file_splice_write,
1301 .unlocked_ioctl = cifs_ioctl,
1302 .copy_file_range = cifs_copy_file_range,
1303 .remap_file_range = cifs_remap_file_range,
1304 .llseek = cifs_llseek,
1305 .setlease = cifs_setlease,
1306 .fallocate = cifs_fallocate,
1309 const struct file_operations cifs_file_nobrl_ops = {
1310 .read_iter = cifs_loose_read_iter,
1311 .write_iter = cifs_file_write_iter,
1313 .release = cifs_close,
1314 .fsync = cifs_fsync,
1315 .flush = cifs_flush,
1316 .mmap = cifs_file_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_strict_nobrl_ops = {
1328 .read_iter = cifs_strict_readv,
1329 .write_iter = cifs_strict_writev,
1331 .release = cifs_close,
1332 .fsync = cifs_strict_fsync,
1333 .flush = cifs_flush,
1334 .mmap = cifs_file_strict_mmap,
1335 .splice_read = generic_file_splice_read,
1336 .splice_write = iter_file_splice_write,
1337 .llseek = cifs_llseek,
1338 .unlocked_ioctl = cifs_ioctl,
1339 .copy_file_range = cifs_copy_file_range,
1340 .remap_file_range = cifs_remap_file_range,
1341 .setlease = cifs_setlease,
1342 .fallocate = cifs_fallocate,
1345 const struct file_operations cifs_file_direct_nobrl_ops = {
1346 .read_iter = cifs_direct_readv,
1347 .write_iter = cifs_direct_writev,
1349 .release = cifs_close,
1350 .fsync = cifs_fsync,
1351 .flush = cifs_flush,
1352 .mmap = cifs_file_mmap,
1353 .splice_read = generic_file_splice_read,
1354 .splice_write = iter_file_splice_write,
1355 .unlocked_ioctl = cifs_ioctl,
1356 .copy_file_range = cifs_copy_file_range,
1357 .remap_file_range = cifs_remap_file_range,
1358 .llseek = cifs_llseek,
1359 .setlease = cifs_setlease,
1360 .fallocate = cifs_fallocate,
1363 const struct file_operations cifs_dir_ops = {
1364 .iterate_shared = cifs_readdir,
1365 .release = cifs_closedir,
1366 .read = generic_read_dir,
1367 .unlocked_ioctl = cifs_ioctl,
1368 .copy_file_range = cifs_copy_file_range,
1369 .remap_file_range = cifs_remap_file_range,
1370 .llseek = generic_file_llseek,
1371 .fsync = cifs_dir_fsync,
1375 cifs_init_once(void *inode)
1377 struct cifsInodeInfo *cifsi = inode;
1379 inode_init_once(&cifsi->vfs_inode);
1380 init_rwsem(&cifsi->lock_sem);
1384 cifs_init_inodecache(void)
1386 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1387 sizeof(struct cifsInodeInfo),
1388 0, (SLAB_RECLAIM_ACCOUNT|
1389 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1391 if (cifs_inode_cachep == NULL)
1398 cifs_destroy_inodecache(void)
1401 * Make sure all delayed rcu free inodes are flushed before we
1405 kmem_cache_destroy(cifs_inode_cachep);
1409 cifs_init_request_bufs(void)
1412 * SMB2 maximum header size is bigger than CIFS one - no problems to
1413 * allocate some more bytes for CIFS.
1415 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1417 if (CIFSMaxBufSize < 8192) {
1418 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1419 Unicode path name has to fit in any SMB/CIFS path based frames */
1420 CIFSMaxBufSize = 8192;
1421 } else if (CIFSMaxBufSize > 1024*127) {
1422 CIFSMaxBufSize = 1024 * 127;
1424 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1427 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1428 CIFSMaxBufSize, CIFSMaxBufSize);
1430 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1431 CIFSMaxBufSize + max_hdr_size, 0,
1432 SLAB_HWCACHE_ALIGN, 0,
1433 CIFSMaxBufSize + max_hdr_size,
1435 if (cifs_req_cachep == NULL)
1438 if (cifs_min_rcv < 1)
1440 else if (cifs_min_rcv > 64) {
1442 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1445 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1448 if (cifs_req_poolp == NULL) {
1449 kmem_cache_destroy(cifs_req_cachep);
1452 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1453 almost all handle based requests (but not write response, nor is it
1454 sufficient for path based requests). A smaller size would have
1455 been more efficient (compacting multiple slab items on one 4k page)
1456 for the case in which debug was on, but this larger size allows
1457 more SMBs to use small buffer alloc and is still much more
1458 efficient to alloc 1 per page off the slab compared to 17K (5page)
1459 alloc of large cifs buffers even when page debugging is on */
1460 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1461 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1462 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1463 if (cifs_sm_req_cachep == NULL) {
1464 mempool_destroy(cifs_req_poolp);
1465 kmem_cache_destroy(cifs_req_cachep);
1469 if (cifs_min_small < 2)
1471 else if (cifs_min_small > 256) {
1472 cifs_min_small = 256;
1473 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1476 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1477 cifs_sm_req_cachep);
1479 if (cifs_sm_req_poolp == NULL) {
1480 mempool_destroy(cifs_req_poolp);
1481 kmem_cache_destroy(cifs_req_cachep);
1482 kmem_cache_destroy(cifs_sm_req_cachep);
1490 cifs_destroy_request_bufs(void)
1492 mempool_destroy(cifs_req_poolp);
1493 kmem_cache_destroy(cifs_req_cachep);
1494 mempool_destroy(cifs_sm_req_poolp);
1495 kmem_cache_destroy(cifs_sm_req_cachep);
1499 cifs_init_mids(void)
1501 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1502 sizeof(struct mid_q_entry), 0,
1503 SLAB_HWCACHE_ALIGN, NULL);
1504 if (cifs_mid_cachep == NULL)
1507 /* 3 is a reasonable minimum number of simultaneous operations */
1508 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1509 if (cifs_mid_poolp == NULL) {
1510 kmem_cache_destroy(cifs_mid_cachep);
1518 cifs_destroy_mids(void)
1520 mempool_destroy(cifs_mid_poolp);
1521 kmem_cache_destroy(cifs_mid_cachep);
1529 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1530 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1531 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1532 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1533 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1535 * Initialize Global counters
1537 atomic_set(&sesInfoAllocCount, 0);
1538 atomic_set(&tconInfoAllocCount, 0);
1539 atomic_set(&tcpSesNextId, 0);
1540 atomic_set(&tcpSesAllocCount, 0);
1541 atomic_set(&tcpSesReconnectCount, 0);
1542 atomic_set(&tconInfoReconnectCount, 0);
1544 atomic_set(&bufAllocCount, 0);
1545 atomic_set(&smBufAllocCount, 0);
1546 #ifdef CONFIG_CIFS_STATS2
1547 atomic_set(&totBufAllocCount, 0);
1548 atomic_set(&totSmBufAllocCount, 0);
1549 if (slow_rsp_threshold < 1)
1550 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1551 else if (slow_rsp_threshold > 32767)
1553 "slow response threshold set higher than recommended (0 to 32767)\n");
1554 #endif /* CONFIG_CIFS_STATS2 */
1556 atomic_set(&midCount, 0);
1557 GlobalCurrentXid = 0;
1558 GlobalTotalActiveXid = 0;
1559 GlobalMaxActiveXid = 0;
1560 spin_lock_init(&cifs_tcp_ses_lock);
1561 spin_lock_init(&GlobalMid_Lock);
1563 cifs_lock_secret = get_random_u32();
1565 if (cifs_max_pending < 2) {
1566 cifs_max_pending = 2;
1567 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1568 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1569 cifs_max_pending = CIFS_MAX_REQ;
1570 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1574 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1577 goto out_clean_proc;
1581 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1582 * so that we don't launch too many worker threads but
1583 * Documentation/core-api/workqueue.rst recommends setting it to 0
1586 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1587 decrypt_wq = alloc_workqueue("smb3decryptd",
1588 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1591 goto out_destroy_cifsiod_wq;
1594 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1595 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1596 if (!fileinfo_put_wq) {
1598 goto out_destroy_decrypt_wq;
1601 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1602 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1603 if (!cifsoplockd_wq) {
1605 goto out_destroy_fileinfo_put_wq;
1608 rc = cifs_fscache_register();
1610 goto out_destroy_cifsoplockd_wq;
1612 rc = cifs_init_inodecache();
1614 goto out_unreg_fscache;
1616 rc = cifs_init_mids();
1618 goto out_destroy_inodecache;
1620 rc = cifs_init_request_bufs();
1622 goto out_destroy_mids;
1624 #ifdef CONFIG_CIFS_DFS_UPCALL
1625 rc = dfs_cache_init();
1627 goto out_destroy_request_bufs;
1628 #endif /* CONFIG_CIFS_DFS_UPCALL */
1629 #ifdef CONFIG_CIFS_UPCALL
1630 rc = init_cifs_spnego();
1632 goto out_destroy_dfs_cache;
1633 #endif /* CONFIG_CIFS_UPCALL */
1634 #ifdef CONFIG_CIFS_SWN_UPCALL
1635 rc = cifs_genl_init();
1637 goto out_register_key_type;
1638 #endif /* CONFIG_CIFS_SWN_UPCALL */
1640 rc = init_cifs_idmap();
1642 goto out_cifs_swn_init;
1644 rc = register_filesystem(&cifs_fs_type);
1646 goto out_init_cifs_idmap;
1648 rc = register_filesystem(&smb3_fs_type);
1650 unregister_filesystem(&cifs_fs_type);
1651 goto out_init_cifs_idmap;
1656 out_init_cifs_idmap:
1659 #ifdef CONFIG_CIFS_SWN_UPCALL
1661 out_register_key_type:
1663 #ifdef CONFIG_CIFS_UPCALL
1665 out_destroy_dfs_cache:
1667 #ifdef CONFIG_CIFS_DFS_UPCALL
1668 dfs_cache_destroy();
1669 out_destroy_request_bufs:
1671 cifs_destroy_request_bufs();
1673 cifs_destroy_mids();
1674 out_destroy_inodecache:
1675 cifs_destroy_inodecache();
1677 cifs_fscache_unregister();
1678 out_destroy_cifsoplockd_wq:
1679 destroy_workqueue(cifsoplockd_wq);
1680 out_destroy_fileinfo_put_wq:
1681 destroy_workqueue(fileinfo_put_wq);
1682 out_destroy_decrypt_wq:
1683 destroy_workqueue(decrypt_wq);
1684 out_destroy_cifsiod_wq:
1685 destroy_workqueue(cifsiod_wq);
1694 cifs_dbg(NOISY, "exit_smb3\n");
1695 unregister_filesystem(&cifs_fs_type);
1696 unregister_filesystem(&smb3_fs_type);
1697 cifs_dfs_release_automount_timer();
1699 #ifdef CONFIG_CIFS_SWN_UPCALL
1702 #ifdef CONFIG_CIFS_UPCALL
1705 #ifdef CONFIG_CIFS_DFS_UPCALL
1706 dfs_cache_destroy();
1708 cifs_destroy_request_bufs();
1709 cifs_destroy_mids();
1710 cifs_destroy_inodecache();
1711 cifs_fscache_unregister();
1712 destroy_workqueue(cifsoplockd_wq);
1713 destroy_workqueue(decrypt_wq);
1714 destroy_workqueue(fileinfo_put_wq);
1715 destroy_workqueue(cifsiod_wq);
1719 MODULE_AUTHOR("Steve French");
1720 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1722 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1723 "also older servers complying with the SNIA CIFS Specification)");
1724 MODULE_VERSION(CIFS_VERSION);
1725 MODULE_SOFTDEP("ecb");
1726 MODULE_SOFTDEP("hmac");
1727 MODULE_SOFTDEP("md4");
1728 MODULE_SOFTDEP("md5");
1729 MODULE_SOFTDEP("nls");
1730 MODULE_SOFTDEP("aes");
1731 MODULE_SOFTDEP("cmac");
1732 MODULE_SOFTDEP("sha256");
1733 MODULE_SOFTDEP("sha512");
1734 MODULE_SOFTDEP("aead2");
1735 MODULE_SOFTDEP("ccm");
1736 MODULE_SOFTDEP("gcm");
1737 module_init(init_cifs)
1738 module_exit(exit_cifs)