4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
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 /* escape all spaces in share names */
480 seq_escape(m, devname, " \t");
487 * cifs_show_options() is for displaying mount options in /proc/mounts.
488 * Not all settable options are displayed but most of the important
492 cifs_show_options(struct seq_file *s, struct dentry *root)
494 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
495 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
496 struct sockaddr *srcaddr;
497 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
499 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
500 cifs_show_security(s, tcon->ses);
501 cifs_show_cache_flavor(s, cifs_sb);
504 seq_puts(s, ",nolease");
505 if (cifs_sb->ctx->multiuser)
506 seq_puts(s, ",multiuser");
507 else if (tcon->ses->user_name)
508 seq_show_option(s, "username", tcon->ses->user_name);
510 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
511 seq_show_option(s, "domain", tcon->ses->domainName);
513 if (srcaddr->sa_family != AF_UNSPEC) {
514 struct sockaddr_in *saddr4;
515 struct sockaddr_in6 *saddr6;
516 saddr4 = (struct sockaddr_in *)srcaddr;
517 saddr6 = (struct sockaddr_in6 *)srcaddr;
518 if (srcaddr->sa_family == AF_INET6)
519 seq_printf(s, ",srcaddr=%pI6c",
521 else if (srcaddr->sa_family == AF_INET)
522 seq_printf(s, ",srcaddr=%pI4",
523 &saddr4->sin_addr.s_addr);
525 seq_printf(s, ",srcaddr=BAD-AF:%i",
526 (int)(srcaddr->sa_family));
529 seq_printf(s, ",uid=%u",
530 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
531 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
532 seq_puts(s, ",forceuid");
534 seq_puts(s, ",noforceuid");
536 seq_printf(s, ",gid=%u",
537 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
538 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
539 seq_puts(s, ",forcegid");
541 seq_puts(s, ",noforcegid");
543 cifs_show_address(s, tcon->ses->server);
546 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
547 cifs_sb->ctx->file_mode,
548 cifs_sb->ctx->dir_mode);
549 if (cifs_sb->ctx->iocharset)
550 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
552 seq_puts(s, ",seal");
553 else if (tcon->ses->server->ignore_signature)
554 seq_puts(s, ",signloosely");
556 seq_puts(s, ",nocase");
558 seq_puts(s, ",nodelete");
559 if (tcon->local_lease)
560 seq_puts(s, ",locallease");
562 seq_puts(s, ",hard");
564 seq_puts(s, ",soft");
565 if (tcon->use_persistent)
566 seq_puts(s, ",persistenthandles");
567 else if (tcon->use_resilient)
568 seq_puts(s, ",resilienthandles");
569 if (tcon->posix_extensions)
570 seq_puts(s, ",posix");
571 else if (tcon->unix_ext)
572 seq_puts(s, ",unix");
574 seq_puts(s, ",nounix");
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
576 seq_puts(s, ",nodfs");
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
578 seq_puts(s, ",posixpaths");
579 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
580 seq_puts(s, ",setuids");
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
582 seq_puts(s, ",idsfromsid");
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
584 seq_puts(s, ",serverino");
585 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
586 seq_puts(s, ",rwpidforward");
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
588 seq_puts(s, ",forcemand");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
590 seq_puts(s, ",nouser_xattr");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
592 seq_puts(s, ",mapchars");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
594 seq_puts(s, ",mapposix");
595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
598 seq_puts(s, ",nobrl");
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
600 seq_puts(s, ",nohandlecache");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
602 seq_puts(s, ",modefromsid");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
604 seq_puts(s, ",cifsacl");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
606 seq_puts(s, ",dynperm");
607 if (root->d_sb->s_flags & SB_POSIXACL)
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
610 seq_puts(s, ",mfsymlinks");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
614 seq_puts(s, ",nostrictsync");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
616 seq_puts(s, ",noperm");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
618 seq_printf(s, ",backupuid=%u",
619 from_kuid_munged(&init_user_ns,
620 cifs_sb->ctx->backupuid));
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
622 seq_printf(s, ",backupgid=%u",
623 from_kgid_munged(&init_user_ns,
624 cifs_sb->ctx->backupgid));
626 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
627 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
628 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
629 if (tcon->ses->server->min_offload)
630 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
631 seq_printf(s, ",echo_interval=%lu",
632 tcon->ses->server->echo_interval / HZ);
634 /* Only display max_credits if it was overridden on mount */
635 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
636 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
638 if (tcon->snapshot_time)
639 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
640 if (tcon->handle_timeout)
641 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
644 * Display file and directory attribute timeout in seconds.
645 * If file and directory attribute timeout the same then actimeo
646 * was likely specified on mount
648 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
649 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
651 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
652 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
655 if (tcon->ses->chan_max > 1)
656 seq_printf(s, ",multichannel,max_channels=%zu",
657 tcon->ses->chan_max);
659 if (tcon->use_witness)
660 seq_puts(s, ",witness");
665 static void cifs_umount_begin(struct super_block *sb)
667 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
668 struct cifs_tcon *tcon;
673 tcon = cifs_sb_master_tcon(cifs_sb);
675 spin_lock(&cifs_tcp_ses_lock);
676 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
677 /* we have other mounts to same share or we have
678 already tried to force umount this and woken up
679 all waiting network requests, nothing to do */
680 spin_unlock(&cifs_tcp_ses_lock);
682 } else if (tcon->tc_count == 1)
683 tcon->tidStatus = CifsExiting;
684 spin_unlock(&cifs_tcp_ses_lock);
686 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
687 /* cancel_notify_requests(tcon); */
688 if (tcon->ses && tcon->ses->server) {
689 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
690 wake_up_all(&tcon->ses->server->request_q);
691 wake_up_all(&tcon->ses->server->response_q);
692 msleep(1); /* yield */
693 /* we have to kick the requests once more */
694 wake_up_all(&tcon->ses->server->response_q);
701 #ifdef CONFIG_CIFS_STATS2
702 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
709 static int cifs_drop_inode(struct inode *inode)
711 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
713 /* no serverino => unconditional eviction */
714 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
715 generic_drop_inode(inode);
718 static const struct super_operations cifs_super_ops = {
719 .statfs = cifs_statfs,
720 .alloc_inode = cifs_alloc_inode,
721 .free_inode = cifs_free_inode,
722 .drop_inode = cifs_drop_inode,
723 .evict_inode = cifs_evict_inode,
724 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
725 .show_devname = cifs_show_devname,
726 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
727 function unless later we add lazy close of inodes or unless the
728 kernel forgets to call us with the same number of releases (closes)
730 .show_options = cifs_show_options,
731 .umount_begin = cifs_umount_begin,
732 #ifdef CONFIG_CIFS_STATS2
733 .show_stats = cifs_show_stats,
738 * Get root dentry from superblock according to prefix path mount option.
739 * Return dentry with refcount + 1 on success and NULL otherwise.
741 static struct dentry *
742 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
744 struct dentry *dentry;
745 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
746 char *full_path = NULL;
750 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
751 return dget(sb->s_root);
753 full_path = cifs_build_path_to_root(ctx, cifs_sb,
754 cifs_sb_master_tcon(cifs_sb), 0);
755 if (full_path == NULL)
756 return ERR_PTR(-ENOMEM);
758 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
760 sep = CIFS_DIR_SEP(cifs_sb);
761 dentry = dget(sb->s_root);
765 struct inode *dir = d_inode(dentry);
766 struct dentry *child;
768 if (!S_ISDIR(dir->i_mode)) {
770 dentry = ERR_PTR(-ENOTDIR);
774 /* skip separators */
781 while (*s && *s != sep)
784 child = lookup_positive_unlocked(p, dentry, s - p);
787 } while (!IS_ERR(dentry));
792 static int cifs_set_super(struct super_block *sb, void *data)
794 struct cifs_mnt_data *mnt_data = data;
795 sb->s_fs_info = mnt_data->cifs_sb;
796 return set_anon_super(sb, NULL);
800 cifs_smb3_do_mount(struct file_system_type *fs_type,
801 int flags, struct smb3_fs_context *old_ctx)
804 struct super_block *sb;
805 struct cifs_sb_info *cifs_sb = NULL;
806 struct cifs_mnt_data mnt_data;
810 * Prints in Kernel / CIFS log the attempted mount operation
811 * If CIFS_DEBUG && cifs_FYI
814 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
816 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
818 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
819 if (cifs_sb == NULL) {
820 root = ERR_PTR(-ENOMEM);
824 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
826 root = ERR_PTR(-ENOMEM);
829 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
835 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC);
841 rc = cifs_setup_cifs_sb(cifs_sb);
847 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
849 if (!(flags & SB_SILENT))
850 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
856 mnt_data.ctx = cifs_sb->ctx;
857 mnt_data.cifs_sb = cifs_sb;
858 mnt_data.flags = flags;
860 /* BB should we make this contingent on mount parm? */
861 flags |= SB_NODIRATIME | SB_NOATIME;
863 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
866 cifs_umount(cifs_sb);
872 cifs_dbg(FYI, "Use existing superblock\n");
873 cifs_umount(cifs_sb);
876 rc = cifs_read_super(sb);
882 sb->s_flags |= SB_ACTIVE;
885 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
889 cifs_dbg(FYI, "dentry root is: %p\n", root);
893 deactivate_locked_super(sb);
896 kfree(cifs_sb->prepath);
897 smb3_cleanup_fs_context(cifs_sb->ctx);
905 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
908 struct inode *inode = file_inode(iocb->ki_filp);
910 if (iocb->ki_filp->f_flags & O_DIRECT)
911 return cifs_user_readv(iocb, iter);
913 rc = cifs_revalidate_mapping(inode);
917 return generic_file_read_iter(iocb, iter);
920 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
922 struct inode *inode = file_inode(iocb->ki_filp);
923 struct cifsInodeInfo *cinode = CIFS_I(inode);
927 if (iocb->ki_filp->f_flags & O_DIRECT) {
928 written = cifs_user_writev(iocb, from);
929 if (written > 0 && CIFS_CACHE_READ(cinode)) {
930 cifs_zap_mapping(inode);
932 "Set no oplock for inode=%p after a write operation\n",
939 written = cifs_get_writer(cinode);
943 written = generic_file_write_iter(iocb, from);
945 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
948 rc = filemap_fdatawrite(inode->i_mapping);
950 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
954 cifs_put_writer(cinode);
958 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
960 struct cifsFileInfo *cfile = file->private_data;
961 struct cifs_tcon *tcon;
964 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
965 * the cached file length
967 if (whence != SEEK_SET && whence != SEEK_CUR) {
969 struct inode *inode = file_inode(file);
972 * We need to be sure that all dirty pages are written and the
973 * server has the newest file length.
975 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
976 inode->i_mapping->nrpages != 0) {
977 rc = filemap_fdatawait(inode->i_mapping);
979 mapping_set_error(inode->i_mapping, rc);
984 * Some applications poll for the file length in this strange
985 * way so we must seek to end on non-oplocked files by
986 * setting the revalidate time to zero.
988 CIFS_I(inode)->time = 0;
990 rc = cifs_revalidate_file_attr(file);
994 if (cfile && cfile->tlink) {
995 tcon = tlink_tcon(cfile->tlink);
996 if (tcon->ses->server->ops->llseek)
997 return tcon->ses->server->ops->llseek(file, tcon,
1000 return generic_file_llseek(file, offset, whence);
1004 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1007 * Note that this is called by vfs setlease with i_lock held to
1008 * protect *lease from going away.
1010 struct inode *inode = file_inode(file);
1011 struct cifsFileInfo *cfile = file->private_data;
1013 if (!(S_ISREG(inode->i_mode)))
1016 /* Check if file is oplocked if this is request for new lease */
1017 if (arg == F_UNLCK ||
1018 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1019 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1020 return generic_setlease(file, arg, lease, priv);
1021 else if (tlink_tcon(cfile->tlink)->local_lease &&
1022 !CIFS_CACHE_READ(CIFS_I(inode)))
1024 * If the server claims to support oplock on this file, then we
1025 * still need to check oplock even if the local_lease mount
1026 * option is set, but there are servers which do not support
1027 * oplock for which this mount option may be useful if the user
1028 * knows that the file won't be changed on the server by anyone
1031 return generic_setlease(file, arg, lease, priv);
1036 struct file_system_type cifs_fs_type = {
1037 .owner = THIS_MODULE,
1039 .init_fs_context = smb3_init_fs_context,
1040 .parameters = smb3_fs_parameters,
1041 .kill_sb = cifs_kill_sb,
1042 .fs_flags = FS_RENAME_DOES_D_MOVE,
1044 MODULE_ALIAS_FS("cifs");
1046 static struct file_system_type smb3_fs_type = {
1047 .owner = THIS_MODULE,
1049 .init_fs_context = smb3_init_fs_context,
1050 .parameters = smb3_fs_parameters,
1051 .kill_sb = cifs_kill_sb,
1052 .fs_flags = FS_RENAME_DOES_D_MOVE,
1054 MODULE_ALIAS_FS("smb3");
1055 MODULE_ALIAS("smb3");
1057 const struct inode_operations cifs_dir_inode_ops = {
1058 .create = cifs_create,
1059 .atomic_open = cifs_atomic_open,
1060 .lookup = cifs_lookup,
1061 .getattr = cifs_getattr,
1062 .unlink = cifs_unlink,
1063 .link = cifs_hardlink,
1064 .mkdir = cifs_mkdir,
1065 .rmdir = cifs_rmdir,
1066 .rename = cifs_rename2,
1067 .permission = cifs_permission,
1068 .setattr = cifs_setattr,
1069 .symlink = cifs_symlink,
1070 .mknod = cifs_mknod,
1071 .listxattr = cifs_listxattr,
1074 const struct inode_operations cifs_file_inode_ops = {
1075 .setattr = cifs_setattr,
1076 .getattr = cifs_getattr,
1077 .permission = cifs_permission,
1078 .listxattr = cifs_listxattr,
1079 .fiemap = cifs_fiemap,
1082 const struct inode_operations cifs_symlink_inode_ops = {
1083 .get_link = cifs_get_link,
1084 .permission = cifs_permission,
1085 .listxattr = cifs_listxattr,
1088 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1089 struct file *dst_file, loff_t destoff, loff_t len,
1090 unsigned int remap_flags)
1092 struct inode *src_inode = file_inode(src_file);
1093 struct inode *target_inode = file_inode(dst_file);
1094 struct cifsFileInfo *smb_file_src = src_file->private_data;
1095 struct cifsFileInfo *smb_file_target;
1096 struct cifs_tcon *target_tcon;
1100 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1103 cifs_dbg(FYI, "clone range\n");
1107 if (!src_file->private_data || !dst_file->private_data) {
1109 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1113 smb_file_target = dst_file->private_data;
1114 target_tcon = tlink_tcon(smb_file_target->tlink);
1117 * Note: cifs case is easier than btrfs since server responsible for
1118 * checks for proper open modes and file type and if it wants
1119 * server could even support copy of range where source = target
1121 lock_two_nondirectories(target_inode, src_inode);
1124 len = src_inode->i_size - off;
1126 cifs_dbg(FYI, "about to flush pages\n");
1127 /* should we flush first and last page first */
1128 truncate_inode_pages_range(&target_inode->i_data, destoff,
1129 PAGE_ALIGN(destoff + len)-1);
1131 if (target_tcon->ses->server->ops->duplicate_extents)
1132 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1133 smb_file_src, smb_file_target, off, len, destoff);
1137 /* force revalidate of size and timestamps of target file now
1138 that target is updated on the server */
1139 CIFS_I(target_inode)->time = 0;
1140 /* although unlocking in the reverse order from locking is not
1141 strictly necessary here it is a little cleaner to be consistent */
1142 unlock_two_nondirectories(src_inode, target_inode);
1145 return rc < 0 ? rc : len;
1148 ssize_t cifs_file_copychunk_range(unsigned int xid,
1149 struct file *src_file, loff_t off,
1150 struct file *dst_file, loff_t destoff,
1151 size_t len, unsigned int flags)
1153 struct inode *src_inode = file_inode(src_file);
1154 struct inode *target_inode = file_inode(dst_file);
1155 struct cifsFileInfo *smb_file_src;
1156 struct cifsFileInfo *smb_file_target;
1157 struct cifs_tcon *src_tcon;
1158 struct cifs_tcon *target_tcon;
1161 cifs_dbg(FYI, "copychunk range\n");
1163 if (!src_file->private_data || !dst_file->private_data) {
1165 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1170 smb_file_target = dst_file->private_data;
1171 smb_file_src = src_file->private_data;
1172 src_tcon = tlink_tcon(smb_file_src->tlink);
1173 target_tcon = tlink_tcon(smb_file_target->tlink);
1175 if (src_tcon->ses != target_tcon->ses) {
1176 cifs_dbg(VFS, "source and target of copy not on same server\n");
1181 if (!target_tcon->ses->server->ops->copychunk_range)
1185 * Note: cifs case is easier than btrfs since server responsible for
1186 * checks for proper open modes and file type and if it wants
1187 * server could even support copy of range where source = target
1189 lock_two_nondirectories(target_inode, src_inode);
1191 cifs_dbg(FYI, "about to flush pages\n");
1192 /* should we flush first and last page first */
1193 truncate_inode_pages(&target_inode->i_data, 0);
1195 rc = file_modified(dst_file);
1197 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1198 smb_file_src, smb_file_target, off, len, destoff);
1200 file_accessed(src_file);
1202 /* force revalidate of size and timestamps of target file now
1203 * that target is updated on the server
1205 CIFS_I(target_inode)->time = 0;
1206 /* although unlocking in the reverse order from locking is not
1207 * strictly necessary here it is a little cleaner to be consistent
1209 unlock_two_nondirectories(src_inode, target_inode);
1216 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1217 * is a dummy operation.
1219 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1221 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1227 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1228 struct file *dst_file, loff_t destoff,
1229 size_t len, unsigned int flags)
1231 unsigned int xid = get_xid();
1233 struct cifsFileInfo *cfile = dst_file->private_data;
1235 if (cfile->swapfile)
1238 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1242 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1243 rc = generic_copy_file_range(src_file, off, dst_file,
1244 destoff, len, flags);
1248 const struct file_operations cifs_file_ops = {
1249 .read_iter = cifs_loose_read_iter,
1250 .write_iter = cifs_file_write_iter,
1252 .release = cifs_close,
1254 .flock = cifs_flock,
1255 .fsync = cifs_fsync,
1256 .flush = cifs_flush,
1257 .mmap = cifs_file_mmap,
1258 .splice_read = generic_file_splice_read,
1259 .splice_write = iter_file_splice_write,
1260 .llseek = cifs_llseek,
1261 .unlocked_ioctl = cifs_ioctl,
1262 .copy_file_range = cifs_copy_file_range,
1263 .remap_file_range = cifs_remap_file_range,
1264 .setlease = cifs_setlease,
1265 .fallocate = cifs_fallocate,
1268 const struct file_operations cifs_file_strict_ops = {
1269 .read_iter = cifs_strict_readv,
1270 .write_iter = cifs_strict_writev,
1272 .release = cifs_close,
1274 .flock = cifs_flock,
1275 .fsync = cifs_strict_fsync,
1276 .flush = cifs_flush,
1277 .mmap = cifs_file_strict_mmap,
1278 .splice_read = generic_file_splice_read,
1279 .splice_write = iter_file_splice_write,
1280 .llseek = cifs_llseek,
1281 .unlocked_ioctl = cifs_ioctl,
1282 .copy_file_range = cifs_copy_file_range,
1283 .remap_file_range = cifs_remap_file_range,
1284 .setlease = cifs_setlease,
1285 .fallocate = cifs_fallocate,
1288 const struct file_operations cifs_file_direct_ops = {
1289 .read_iter = cifs_direct_readv,
1290 .write_iter = cifs_direct_writev,
1292 .release = cifs_close,
1294 .flock = cifs_flock,
1295 .fsync = cifs_fsync,
1296 .flush = cifs_flush,
1297 .mmap = cifs_file_mmap,
1298 .splice_read = generic_file_splice_read,
1299 .splice_write = iter_file_splice_write,
1300 .unlocked_ioctl = cifs_ioctl,
1301 .copy_file_range = cifs_copy_file_range,
1302 .remap_file_range = cifs_remap_file_range,
1303 .llseek = cifs_llseek,
1304 .setlease = cifs_setlease,
1305 .fallocate = cifs_fallocate,
1308 const struct file_operations cifs_file_nobrl_ops = {
1309 .read_iter = cifs_loose_read_iter,
1310 .write_iter = cifs_file_write_iter,
1312 .release = cifs_close,
1313 .fsync = cifs_fsync,
1314 .flush = cifs_flush,
1315 .mmap = cifs_file_mmap,
1316 .splice_read = generic_file_splice_read,
1317 .splice_write = iter_file_splice_write,
1318 .llseek = cifs_llseek,
1319 .unlocked_ioctl = cifs_ioctl,
1320 .copy_file_range = cifs_copy_file_range,
1321 .remap_file_range = cifs_remap_file_range,
1322 .setlease = cifs_setlease,
1323 .fallocate = cifs_fallocate,
1326 const struct file_operations cifs_file_strict_nobrl_ops = {
1327 .read_iter = cifs_strict_readv,
1328 .write_iter = cifs_strict_writev,
1330 .release = cifs_close,
1331 .fsync = cifs_strict_fsync,
1332 .flush = cifs_flush,
1333 .mmap = cifs_file_strict_mmap,
1334 .splice_read = generic_file_splice_read,
1335 .splice_write = iter_file_splice_write,
1336 .llseek = cifs_llseek,
1337 .unlocked_ioctl = cifs_ioctl,
1338 .copy_file_range = cifs_copy_file_range,
1339 .remap_file_range = cifs_remap_file_range,
1340 .setlease = cifs_setlease,
1341 .fallocate = cifs_fallocate,
1344 const struct file_operations cifs_file_direct_nobrl_ops = {
1345 .read_iter = cifs_direct_readv,
1346 .write_iter = cifs_direct_writev,
1348 .release = cifs_close,
1349 .fsync = cifs_fsync,
1350 .flush = cifs_flush,
1351 .mmap = cifs_file_mmap,
1352 .splice_read = generic_file_splice_read,
1353 .splice_write = iter_file_splice_write,
1354 .unlocked_ioctl = cifs_ioctl,
1355 .copy_file_range = cifs_copy_file_range,
1356 .remap_file_range = cifs_remap_file_range,
1357 .llseek = cifs_llseek,
1358 .setlease = cifs_setlease,
1359 .fallocate = cifs_fallocate,
1362 const struct file_operations cifs_dir_ops = {
1363 .iterate_shared = cifs_readdir,
1364 .release = cifs_closedir,
1365 .read = generic_read_dir,
1366 .unlocked_ioctl = cifs_ioctl,
1367 .copy_file_range = cifs_copy_file_range,
1368 .remap_file_range = cifs_remap_file_range,
1369 .llseek = generic_file_llseek,
1370 .fsync = cifs_dir_fsync,
1374 cifs_init_once(void *inode)
1376 struct cifsInodeInfo *cifsi = inode;
1378 inode_init_once(&cifsi->vfs_inode);
1379 init_rwsem(&cifsi->lock_sem);
1383 cifs_init_inodecache(void)
1385 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1386 sizeof(struct cifsInodeInfo),
1387 0, (SLAB_RECLAIM_ACCOUNT|
1388 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1390 if (cifs_inode_cachep == NULL)
1397 cifs_destroy_inodecache(void)
1400 * Make sure all delayed rcu free inodes are flushed before we
1404 kmem_cache_destroy(cifs_inode_cachep);
1408 cifs_init_request_bufs(void)
1411 * SMB2 maximum header size is bigger than CIFS one - no problems to
1412 * allocate some more bytes for CIFS.
1414 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1416 if (CIFSMaxBufSize < 8192) {
1417 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1418 Unicode path name has to fit in any SMB/CIFS path based frames */
1419 CIFSMaxBufSize = 8192;
1420 } else if (CIFSMaxBufSize > 1024*127) {
1421 CIFSMaxBufSize = 1024 * 127;
1423 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1426 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1427 CIFSMaxBufSize, CIFSMaxBufSize);
1429 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1430 CIFSMaxBufSize + max_hdr_size, 0,
1431 SLAB_HWCACHE_ALIGN, 0,
1432 CIFSMaxBufSize + max_hdr_size,
1434 if (cifs_req_cachep == NULL)
1437 if (cifs_min_rcv < 1)
1439 else if (cifs_min_rcv > 64) {
1441 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1444 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1447 if (cifs_req_poolp == NULL) {
1448 kmem_cache_destroy(cifs_req_cachep);
1451 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1452 almost all handle based requests (but not write response, nor is it
1453 sufficient for path based requests). A smaller size would have
1454 been more efficient (compacting multiple slab items on one 4k page)
1455 for the case in which debug was on, but this larger size allows
1456 more SMBs to use small buffer alloc and is still much more
1457 efficient to alloc 1 per page off the slab compared to 17K (5page)
1458 alloc of large cifs buffers even when page debugging is on */
1459 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1460 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1461 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1462 if (cifs_sm_req_cachep == NULL) {
1463 mempool_destroy(cifs_req_poolp);
1464 kmem_cache_destroy(cifs_req_cachep);
1468 if (cifs_min_small < 2)
1470 else if (cifs_min_small > 256) {
1471 cifs_min_small = 256;
1472 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1475 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1476 cifs_sm_req_cachep);
1478 if (cifs_sm_req_poolp == NULL) {
1479 mempool_destroy(cifs_req_poolp);
1480 kmem_cache_destroy(cifs_req_cachep);
1481 kmem_cache_destroy(cifs_sm_req_cachep);
1489 cifs_destroy_request_bufs(void)
1491 mempool_destroy(cifs_req_poolp);
1492 kmem_cache_destroy(cifs_req_cachep);
1493 mempool_destroy(cifs_sm_req_poolp);
1494 kmem_cache_destroy(cifs_sm_req_cachep);
1498 cifs_init_mids(void)
1500 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1501 sizeof(struct mid_q_entry), 0,
1502 SLAB_HWCACHE_ALIGN, NULL);
1503 if (cifs_mid_cachep == NULL)
1506 /* 3 is a reasonable minimum number of simultaneous operations */
1507 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1508 if (cifs_mid_poolp == NULL) {
1509 kmem_cache_destroy(cifs_mid_cachep);
1517 cifs_destroy_mids(void)
1519 mempool_destroy(cifs_mid_poolp);
1520 kmem_cache_destroy(cifs_mid_cachep);
1528 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1530 * Initialize Global counters
1532 atomic_set(&sesInfoAllocCount, 0);
1533 atomic_set(&tconInfoAllocCount, 0);
1534 atomic_set(&tcpSesNextId, 0);
1535 atomic_set(&tcpSesAllocCount, 0);
1536 atomic_set(&tcpSesReconnectCount, 0);
1537 atomic_set(&tconInfoReconnectCount, 0);
1539 atomic_set(&bufAllocCount, 0);
1540 atomic_set(&smBufAllocCount, 0);
1541 #ifdef CONFIG_CIFS_STATS2
1542 atomic_set(&totBufAllocCount, 0);
1543 atomic_set(&totSmBufAllocCount, 0);
1544 if (slow_rsp_threshold < 1)
1545 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1546 else if (slow_rsp_threshold > 32767)
1548 "slow response threshold set higher than recommended (0 to 32767)\n");
1549 #endif /* CONFIG_CIFS_STATS2 */
1551 atomic_set(&midCount, 0);
1552 GlobalCurrentXid = 0;
1553 GlobalTotalActiveXid = 0;
1554 GlobalMaxActiveXid = 0;
1555 spin_lock_init(&cifs_tcp_ses_lock);
1556 spin_lock_init(&GlobalMid_Lock);
1558 cifs_lock_secret = get_random_u32();
1560 if (cifs_max_pending < 2) {
1561 cifs_max_pending = 2;
1562 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1563 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1564 cifs_max_pending = CIFS_MAX_REQ;
1565 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1569 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1572 goto out_clean_proc;
1576 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1577 * so that we don't launch too many worker threads but
1578 * Documentation/core-api/workqueue.rst recommends setting it to 0
1581 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1582 decrypt_wq = alloc_workqueue("smb3decryptd",
1583 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1586 goto out_destroy_cifsiod_wq;
1589 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1590 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1591 if (!fileinfo_put_wq) {
1593 goto out_destroy_decrypt_wq;
1596 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1597 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1598 if (!cifsoplockd_wq) {
1600 goto out_destroy_fileinfo_put_wq;
1603 rc = cifs_fscache_register();
1605 goto out_destroy_cifsoplockd_wq;
1607 rc = cifs_init_inodecache();
1609 goto out_unreg_fscache;
1611 rc = cifs_init_mids();
1613 goto out_destroy_inodecache;
1615 rc = cifs_init_request_bufs();
1617 goto out_destroy_mids;
1619 #ifdef CONFIG_CIFS_DFS_UPCALL
1620 rc = dfs_cache_init();
1622 goto out_destroy_request_bufs;
1623 #endif /* CONFIG_CIFS_DFS_UPCALL */
1624 #ifdef CONFIG_CIFS_UPCALL
1625 rc = init_cifs_spnego();
1627 goto out_destroy_dfs_cache;
1628 #endif /* CONFIG_CIFS_UPCALL */
1629 #ifdef CONFIG_CIFS_SWN_UPCALL
1630 rc = cifs_genl_init();
1632 goto out_register_key_type;
1633 #endif /* CONFIG_CIFS_SWN_UPCALL */
1635 rc = init_cifs_idmap();
1637 goto out_cifs_swn_init;
1639 rc = register_filesystem(&cifs_fs_type);
1641 goto out_init_cifs_idmap;
1643 rc = register_filesystem(&smb3_fs_type);
1645 unregister_filesystem(&cifs_fs_type);
1646 goto out_init_cifs_idmap;
1651 out_init_cifs_idmap:
1654 #ifdef CONFIG_CIFS_SWN_UPCALL
1656 out_register_key_type:
1658 #ifdef CONFIG_CIFS_UPCALL
1660 out_destroy_dfs_cache:
1662 #ifdef CONFIG_CIFS_DFS_UPCALL
1663 dfs_cache_destroy();
1664 out_destroy_request_bufs:
1666 cifs_destroy_request_bufs();
1668 cifs_destroy_mids();
1669 out_destroy_inodecache:
1670 cifs_destroy_inodecache();
1672 cifs_fscache_unregister();
1673 out_destroy_cifsoplockd_wq:
1674 destroy_workqueue(cifsoplockd_wq);
1675 out_destroy_fileinfo_put_wq:
1676 destroy_workqueue(fileinfo_put_wq);
1677 out_destroy_decrypt_wq:
1678 destroy_workqueue(decrypt_wq);
1679 out_destroy_cifsiod_wq:
1680 destroy_workqueue(cifsiod_wq);
1689 cifs_dbg(NOISY, "exit_smb3\n");
1690 unregister_filesystem(&cifs_fs_type);
1691 unregister_filesystem(&smb3_fs_type);
1692 cifs_dfs_release_automount_timer();
1694 #ifdef CONFIG_CIFS_SWN_UPCALL
1697 #ifdef CONFIG_CIFS_UPCALL
1700 #ifdef CONFIG_CIFS_DFS_UPCALL
1701 dfs_cache_destroy();
1703 cifs_destroy_request_bufs();
1704 cifs_destroy_mids();
1705 cifs_destroy_inodecache();
1706 cifs_fscache_unregister();
1707 destroy_workqueue(cifsoplockd_wq);
1708 destroy_workqueue(decrypt_wq);
1709 destroy_workqueue(fileinfo_put_wq);
1710 destroy_workqueue(cifsiod_wq);
1714 MODULE_AUTHOR("Steve French");
1715 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1717 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1718 "also older servers complying with the SNIA CIFS Specification)");
1719 MODULE_VERSION(CIFS_VERSION);
1720 MODULE_SOFTDEP("ecb");
1721 MODULE_SOFTDEP("hmac");
1722 MODULE_SOFTDEP("md4");
1723 MODULE_SOFTDEP("md5");
1724 MODULE_SOFTDEP("nls");
1725 MODULE_SOFTDEP("aes");
1726 MODULE_SOFTDEP("cmac");
1727 MODULE_SOFTDEP("sha256");
1728 MODULE_SOFTDEP("sha512");
1729 MODULE_SOFTDEP("aead2");
1730 MODULE_SOFTDEP("ccm");
1731 MODULE_SOFTDEP("gcm");
1732 module_init(init_cifs)
1733 module_exit(exit_cifs)