1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
11 /* Note that BB means BUGBUG (ie something to fix eventually) */
13 #include <linux/module.h>
15 #include <linux/mount.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/seq_file.h>
20 #include <linux/vfs.h>
21 #include <linux/mempool.h>
22 #include <linux/delay.h>
23 #include <linux/kthread.h>
24 #include <linux/freezer.h>
25 #include <linux/namei.h>
26 #include <linux/random.h>
27 #include <linux/uuid.h>
28 #include <linux/xattr.h>
29 #include <uapi/linux/magic.h>
33 #define DECLARE_GLOBALS_HERE
35 #include "cifsproto.h"
36 #include "cifs_debug.h"
37 #include "cifs_fs_sb.h"
39 #include <linux/key-type.h>
40 #include "cifs_spnego.h"
42 #ifdef CONFIG_CIFS_DFS_UPCALL
43 #include "dfs_cache.h"
45 #ifdef CONFIG_CIFS_SWN_UPCALL
48 #include "fs_context.h"
51 * DOS dates from 1980/1/1 through 2107/12/31
52 * Protocol specifications indicate the range should be to 119, which
53 * limits maximum year to 2099. But this range has not been checked.
55 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
56 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
57 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
61 bool enable_oplocks = true;
62 bool linuxExtEnabled = true;
63 bool lookupCacheEnabled = true;
64 bool disable_legacy_dialects; /* false by default */
65 bool enable_gcm_256 = true;
66 bool require_gcm_256; /* false by default */
67 bool enable_negotiate_signing; /* false by default */
68 unsigned int global_secflags = CIFSSEC_DEF;
69 /* unsigned int ntlmv2_support = 0; */
70 unsigned int sign_CIFS_PDUs = 1;
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.
270 cifs_sb->root = NULL;
272 node = rb_first(root);
273 while (node != NULL) {
274 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
275 tcon = tlink_tcon(tlink);
277 mutex_lock(&cfid->fid_mutex);
282 mutex_unlock(&cfid->fid_mutex);
283 node = rb_next(node);
287 cifs_umount(cifs_sb);
291 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
293 struct super_block *sb = dentry->d_sb;
294 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
295 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
296 struct TCP_Server_Info *server = tcon->ses->server;
302 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
304 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
306 buf->f_namelen = PATH_MAX;
308 buf->f_fsid.val[0] = tcon->vol_serial_number;
309 /* are using part of create time for more randomness, see man statfs */
310 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
312 buf->f_files = 0; /* undefined */
313 buf->f_ffree = 0; /* unlimited */
315 if (server->ops->queryfs)
316 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
322 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
324 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
325 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
326 struct TCP_Server_Info *server = tcon->ses->server;
328 if (server->ops->fallocate)
329 return server->ops->fallocate(file, tcon, mode, off, len);
334 static int cifs_permission(struct user_namespace *mnt_userns,
335 struct inode *inode, int mask)
337 struct cifs_sb_info *cifs_sb;
339 cifs_sb = CIFS_SB(inode->i_sb);
341 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
342 if ((mask & MAY_EXEC) && !execute_ok(inode))
346 } else /* file mode might have been restricted at mount time
347 on the client (above and beyond ACL on servers) for
348 servers which do not support setting and viewing mode bits,
349 so allowing client to check permissions is useful */
350 return generic_permission(&init_user_ns, inode, mask);
353 static struct kmem_cache *cifs_inode_cachep;
354 static struct kmem_cache *cifs_req_cachep;
355 static struct kmem_cache *cifs_mid_cachep;
356 static struct kmem_cache *cifs_sm_req_cachep;
357 mempool_t *cifs_sm_req_poolp;
358 mempool_t *cifs_req_poolp;
359 mempool_t *cifs_mid_poolp;
361 static struct inode *
362 cifs_alloc_inode(struct super_block *sb)
364 struct cifsInodeInfo *cifs_inode;
365 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
368 cifs_inode->cifsAttrs = 0x20; /* default */
369 cifs_inode->time = 0;
371 * Until the file is open and we have gotten oplock info back from the
372 * server, can not assume caching of file data or metadata.
374 cifs_set_oplock_level(cifs_inode, 0);
375 cifs_inode->flags = 0;
376 spin_lock_init(&cifs_inode->writers_lock);
377 cifs_inode->writers = 0;
378 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
379 cifs_inode->server_eof = 0;
380 cifs_inode->uniqueid = 0;
381 cifs_inode->createtime = 0;
382 cifs_inode->epoch = 0;
383 spin_lock_init(&cifs_inode->open_file_lock);
384 generate_random_uuid(cifs_inode->lease_key);
387 * Can not set i_flags here - they get immediately overwritten to zero
390 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
391 INIT_LIST_HEAD(&cifs_inode->openFileList);
392 INIT_LIST_HEAD(&cifs_inode->llist);
393 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
394 spin_lock_init(&cifs_inode->deferred_lock);
395 return &cifs_inode->vfs_inode;
399 cifs_free_inode(struct inode *inode)
401 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
405 cifs_evict_inode(struct inode *inode)
407 truncate_inode_pages_final(&inode->i_data);
408 if (inode->i_state & I_PINNING_FSCACHE_WB)
409 cifs_fscache_unuse_inode_cookie(inode, true);
410 cifs_fscache_release_inode_cookie(inode);
415 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
417 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
418 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
420 seq_puts(s, ",addr=");
422 switch (server->dstaddr.ss_family) {
424 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
427 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
428 if (sa6->sin6_scope_id)
429 seq_printf(s, "%%%u", sa6->sin6_scope_id);
432 seq_puts(s, "(unknown)");
435 seq_puts(s, ",rdma");
439 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
441 if (ses->sectype == Unspecified) {
442 if (ses->user_name == NULL)
443 seq_puts(s, ",sec=none");
447 seq_puts(s, ",sec=");
449 switch (ses->sectype) {
451 seq_puts(s, "ntlmv2");
457 seq_puts(s, "ntlmssp");
460 /* shouldn't ever happen */
461 seq_puts(s, "unknown");
468 if (ses->sectype == Kerberos)
469 seq_printf(s, ",cruid=%u",
470 from_kuid_munged(&init_user_ns, ses->cred_uid));
474 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
476 seq_puts(s, ",cache=");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
479 seq_puts(s, "strict");
480 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
482 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
483 seq_puts(s, "singleclient"); /* assume only one client access */
484 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
485 seq_puts(s, "ro"); /* read only caching assumed */
487 seq_puts(s, "loose");
491 * cifs_show_devname() is used so we show the mount device name with correct
492 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
494 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
496 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
497 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
502 convert_delimiter(devname, '/');
503 /* escape all spaces in share names */
504 seq_escape(m, devname, " \t");
511 * cifs_show_options() is for displaying mount options in /proc/mounts.
512 * Not all settable options are displayed but most of the important
516 cifs_show_options(struct seq_file *s, struct dentry *root)
518 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
519 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
520 struct sockaddr *srcaddr;
521 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
523 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
524 cifs_show_security(s, tcon->ses);
525 cifs_show_cache_flavor(s, cifs_sb);
528 seq_puts(s, ",nolease");
529 if (cifs_sb->ctx->multiuser)
530 seq_puts(s, ",multiuser");
531 else if (tcon->ses->user_name)
532 seq_show_option(s, "username", tcon->ses->user_name);
534 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
535 seq_show_option(s, "domain", tcon->ses->domainName);
537 if (srcaddr->sa_family != AF_UNSPEC) {
538 struct sockaddr_in *saddr4;
539 struct sockaddr_in6 *saddr6;
540 saddr4 = (struct sockaddr_in *)srcaddr;
541 saddr6 = (struct sockaddr_in6 *)srcaddr;
542 if (srcaddr->sa_family == AF_INET6)
543 seq_printf(s, ",srcaddr=%pI6c",
545 else if (srcaddr->sa_family == AF_INET)
546 seq_printf(s, ",srcaddr=%pI4",
547 &saddr4->sin_addr.s_addr);
549 seq_printf(s, ",srcaddr=BAD-AF:%i",
550 (int)(srcaddr->sa_family));
553 seq_printf(s, ",uid=%u",
554 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
555 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
556 seq_puts(s, ",forceuid");
558 seq_puts(s, ",noforceuid");
560 seq_printf(s, ",gid=%u",
561 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
562 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
563 seq_puts(s, ",forcegid");
565 seq_puts(s, ",noforcegid");
567 cifs_show_address(s, tcon->ses->server);
570 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
571 cifs_sb->ctx->file_mode,
572 cifs_sb->ctx->dir_mode);
573 if (cifs_sb->ctx->iocharset)
574 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
576 seq_puts(s, ",seal");
577 else if (tcon->ses->server->ignore_signature)
578 seq_puts(s, ",signloosely");
580 seq_puts(s, ",nocase");
582 seq_puts(s, ",nodelete");
583 if (tcon->local_lease)
584 seq_puts(s, ",locallease");
586 seq_puts(s, ",hard");
588 seq_puts(s, ",soft");
589 if (tcon->use_persistent)
590 seq_puts(s, ",persistenthandles");
591 else if (tcon->use_resilient)
592 seq_puts(s, ",resilienthandles");
593 if (tcon->posix_extensions)
594 seq_puts(s, ",posix");
595 else if (tcon->unix_ext)
596 seq_puts(s, ",unix");
598 seq_puts(s, ",nounix");
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
600 seq_puts(s, ",nodfs");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
602 seq_puts(s, ",posixpaths");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
604 seq_puts(s, ",setuids");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
606 seq_puts(s, ",idsfromsid");
607 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
608 seq_puts(s, ",serverino");
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
610 seq_puts(s, ",rwpidforward");
611 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
612 seq_puts(s, ",forcemand");
613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
614 seq_puts(s, ",nouser_xattr");
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
616 seq_puts(s, ",mapchars");
617 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
618 seq_puts(s, ",mapposix");
619 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
622 seq_puts(s, ",nobrl");
623 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
624 seq_puts(s, ",nohandlecache");
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
626 seq_puts(s, ",modefromsid");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
628 seq_puts(s, ",cifsacl");
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
630 seq_puts(s, ",dynperm");
631 if (root->d_sb->s_flags & SB_POSIXACL)
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
634 seq_puts(s, ",mfsymlinks");
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
638 seq_puts(s, ",nostrictsync");
639 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
640 seq_puts(s, ",noperm");
641 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
642 seq_printf(s, ",backupuid=%u",
643 from_kuid_munged(&init_user_ns,
644 cifs_sb->ctx->backupuid));
645 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
646 seq_printf(s, ",backupgid=%u",
647 from_kgid_munged(&init_user_ns,
648 cifs_sb->ctx->backupgid));
650 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
651 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
652 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
653 if (cifs_sb->ctx->rasize)
654 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
655 if (tcon->ses->server->min_offload)
656 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
657 seq_printf(s, ",echo_interval=%lu",
658 tcon->ses->server->echo_interval / HZ);
660 /* Only display max_credits if it was overridden on mount */
661 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
662 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
664 if (tcon->snapshot_time)
665 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
666 if (tcon->handle_timeout)
667 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
670 * Display file and directory attribute timeout in seconds.
671 * If file and directory attribute timeout the same then actimeo
672 * was likely specified on mount
674 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
675 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
677 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
678 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
681 if (tcon->ses->chan_max > 1)
682 seq_printf(s, ",multichannel,max_channels=%zu",
683 tcon->ses->chan_max);
685 if (tcon->use_witness)
686 seq_puts(s, ",witness");
691 static void cifs_umount_begin(struct super_block *sb)
693 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
694 struct cifs_tcon *tcon;
699 tcon = cifs_sb_master_tcon(cifs_sb);
701 spin_lock(&cifs_tcp_ses_lock);
702 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
703 /* we have other mounts to same share or we have
704 already tried to force umount this and woken up
705 all waiting network requests, nothing to do */
706 spin_unlock(&cifs_tcp_ses_lock);
708 } else if (tcon->tc_count == 1)
709 tcon->tidStatus = CifsExiting;
710 spin_unlock(&cifs_tcp_ses_lock);
712 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
713 /* cancel_notify_requests(tcon); */
714 if (tcon->ses && tcon->ses->server) {
715 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
716 wake_up_all(&tcon->ses->server->request_q);
717 wake_up_all(&tcon->ses->server->response_q);
718 msleep(1); /* yield */
719 /* we have to kick the requests once more */
720 wake_up_all(&tcon->ses->server->response_q);
727 #ifdef CONFIG_CIFS_STATS2
728 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
735 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
737 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
741 static int cifs_drop_inode(struct inode *inode)
743 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
745 /* no serverino => unconditional eviction */
746 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
747 generic_drop_inode(inode);
750 static const struct super_operations cifs_super_ops = {
751 .statfs = cifs_statfs,
752 .alloc_inode = cifs_alloc_inode,
753 .write_inode = cifs_write_inode,
754 .free_inode = cifs_free_inode,
755 .drop_inode = cifs_drop_inode,
756 .evict_inode = cifs_evict_inode,
757 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
758 .show_devname = cifs_show_devname,
759 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
760 function unless later we add lazy close of inodes or unless the
761 kernel forgets to call us with the same number of releases (closes)
763 .show_options = cifs_show_options,
764 .umount_begin = cifs_umount_begin,
765 #ifdef CONFIG_CIFS_STATS2
766 .show_stats = cifs_show_stats,
771 * Get root dentry from superblock according to prefix path mount option.
772 * Return dentry with refcount + 1 on success and NULL otherwise.
774 static struct dentry *
775 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
777 struct dentry *dentry;
778 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
779 char *full_path = NULL;
783 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
784 return dget(sb->s_root);
786 full_path = cifs_build_path_to_root(ctx, cifs_sb,
787 cifs_sb_master_tcon(cifs_sb), 0);
788 if (full_path == NULL)
789 return ERR_PTR(-ENOMEM);
791 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
793 sep = CIFS_DIR_SEP(cifs_sb);
794 dentry = dget(sb->s_root);
798 struct inode *dir = d_inode(dentry);
799 struct dentry *child;
801 if (!S_ISDIR(dir->i_mode)) {
803 dentry = ERR_PTR(-ENOTDIR);
807 /* skip separators */
814 while (*s && *s != sep)
817 child = lookup_positive_unlocked(p, dentry, s - p);
820 } while (!IS_ERR(dentry));
825 static int cifs_set_super(struct super_block *sb, void *data)
827 struct cifs_mnt_data *mnt_data = data;
828 sb->s_fs_info = mnt_data->cifs_sb;
829 return set_anon_super(sb, NULL);
833 cifs_smb3_do_mount(struct file_system_type *fs_type,
834 int flags, struct smb3_fs_context *old_ctx)
837 struct super_block *sb;
838 struct cifs_sb_info *cifs_sb = NULL;
839 struct cifs_mnt_data mnt_data;
843 * Prints in Kernel / CIFS log the attempted mount operation
844 * If CIFS_DEBUG && cifs_FYI
847 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
849 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
851 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
852 if (cifs_sb == NULL) {
853 root = ERR_PTR(-ENOMEM);
857 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
859 root = ERR_PTR(-ENOMEM);
862 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
868 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
874 rc = cifs_setup_cifs_sb(cifs_sb);
880 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
882 if (!(flags & SB_SILENT))
883 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
889 mnt_data.ctx = cifs_sb->ctx;
890 mnt_data.cifs_sb = cifs_sb;
891 mnt_data.flags = flags;
893 /* BB should we make this contingent on mount parm? */
894 flags |= SB_NODIRATIME | SB_NOATIME;
896 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
899 cifs_umount(cifs_sb);
905 cifs_dbg(FYI, "Use existing superblock\n");
906 cifs_umount(cifs_sb);
909 rc = cifs_read_super(sb);
915 sb->s_flags |= SB_ACTIVE;
918 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
923 cifs_sb->root = dget(root);
925 cifs_dbg(FYI, "dentry root is: %p\n", root);
929 deactivate_locked_super(sb);
933 kfree(cifs_sb->prepath);
934 smb3_cleanup_fs_context(cifs_sb->ctx);
942 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
945 struct inode *inode = file_inode(iocb->ki_filp);
947 if (iocb->ki_filp->f_flags & O_DIRECT)
948 return cifs_user_readv(iocb, iter);
950 rc = cifs_revalidate_mapping(inode);
954 return generic_file_read_iter(iocb, iter);
957 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
959 struct inode *inode = file_inode(iocb->ki_filp);
960 struct cifsInodeInfo *cinode = CIFS_I(inode);
964 if (iocb->ki_filp->f_flags & O_DIRECT) {
965 written = cifs_user_writev(iocb, from);
966 if (written > 0 && CIFS_CACHE_READ(cinode)) {
967 cifs_zap_mapping(inode);
969 "Set no oplock for inode=%p after a write operation\n",
976 written = cifs_get_writer(cinode);
980 written = generic_file_write_iter(iocb, from);
982 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
985 rc = filemap_fdatawrite(inode->i_mapping);
987 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
991 cifs_put_writer(cinode);
995 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
997 struct cifsFileInfo *cfile = file->private_data;
998 struct cifs_tcon *tcon;
1001 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1002 * the cached file length
1004 if (whence != SEEK_SET && whence != SEEK_CUR) {
1006 struct inode *inode = file_inode(file);
1009 * We need to be sure that all dirty pages are written and the
1010 * server has the newest file length.
1012 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1013 inode->i_mapping->nrpages != 0) {
1014 rc = filemap_fdatawait(inode->i_mapping);
1016 mapping_set_error(inode->i_mapping, rc);
1021 * Some applications poll for the file length in this strange
1022 * way so we must seek to end on non-oplocked files by
1023 * setting the revalidate time to zero.
1025 CIFS_I(inode)->time = 0;
1027 rc = cifs_revalidate_file_attr(file);
1031 if (cfile && cfile->tlink) {
1032 tcon = tlink_tcon(cfile->tlink);
1033 if (tcon->ses->server->ops->llseek)
1034 return tcon->ses->server->ops->llseek(file, tcon,
1037 return generic_file_llseek(file, offset, whence);
1041 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1044 * Note that this is called by vfs setlease with i_lock held to
1045 * protect *lease from going away.
1047 struct inode *inode = file_inode(file);
1048 struct cifsFileInfo *cfile = file->private_data;
1050 if (!(S_ISREG(inode->i_mode)))
1053 /* Check if file is oplocked if this is request for new lease */
1054 if (arg == F_UNLCK ||
1055 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1056 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1057 return generic_setlease(file, arg, lease, priv);
1058 else if (tlink_tcon(cfile->tlink)->local_lease &&
1059 !CIFS_CACHE_READ(CIFS_I(inode)))
1061 * If the server claims to support oplock on this file, then we
1062 * still need to check oplock even if the local_lease mount
1063 * option is set, but there are servers which do not support
1064 * oplock for which this mount option may be useful if the user
1065 * knows that the file won't be changed on the server by anyone
1068 return generic_setlease(file, arg, lease, priv);
1073 struct file_system_type cifs_fs_type = {
1074 .owner = THIS_MODULE,
1076 .init_fs_context = smb3_init_fs_context,
1077 .parameters = smb3_fs_parameters,
1078 .kill_sb = cifs_kill_sb,
1079 .fs_flags = FS_RENAME_DOES_D_MOVE,
1081 MODULE_ALIAS_FS("cifs");
1083 static struct file_system_type smb3_fs_type = {
1084 .owner = THIS_MODULE,
1086 .init_fs_context = smb3_init_fs_context,
1087 .parameters = smb3_fs_parameters,
1088 .kill_sb = cifs_kill_sb,
1089 .fs_flags = FS_RENAME_DOES_D_MOVE,
1091 MODULE_ALIAS_FS("smb3");
1092 MODULE_ALIAS("smb3");
1094 const struct inode_operations cifs_dir_inode_ops = {
1095 .create = cifs_create,
1096 .atomic_open = cifs_atomic_open,
1097 .lookup = cifs_lookup,
1098 .getattr = cifs_getattr,
1099 .unlink = cifs_unlink,
1100 .link = cifs_hardlink,
1101 .mkdir = cifs_mkdir,
1102 .rmdir = cifs_rmdir,
1103 .rename = cifs_rename2,
1104 .permission = cifs_permission,
1105 .setattr = cifs_setattr,
1106 .symlink = cifs_symlink,
1107 .mknod = cifs_mknod,
1108 .listxattr = cifs_listxattr,
1111 const struct inode_operations cifs_file_inode_ops = {
1112 .setattr = cifs_setattr,
1113 .getattr = cifs_getattr,
1114 .permission = cifs_permission,
1115 .listxattr = cifs_listxattr,
1116 .fiemap = cifs_fiemap,
1119 const struct inode_operations cifs_symlink_inode_ops = {
1120 .get_link = cifs_get_link,
1121 .permission = cifs_permission,
1122 .listxattr = cifs_listxattr,
1125 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1126 struct file *dst_file, loff_t destoff, loff_t len,
1127 unsigned int remap_flags)
1129 struct inode *src_inode = file_inode(src_file);
1130 struct inode *target_inode = file_inode(dst_file);
1131 struct cifsFileInfo *smb_file_src = src_file->private_data;
1132 struct cifsFileInfo *smb_file_target;
1133 struct cifs_tcon *target_tcon;
1137 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1140 cifs_dbg(FYI, "clone range\n");
1144 if (!src_file->private_data || !dst_file->private_data) {
1146 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1150 smb_file_target = dst_file->private_data;
1151 target_tcon = tlink_tcon(smb_file_target->tlink);
1154 * Note: cifs case is easier than btrfs since server responsible for
1155 * checks for proper open modes and file type and if it wants
1156 * server could even support copy of range where source = target
1158 lock_two_nondirectories(target_inode, src_inode);
1161 len = src_inode->i_size - off;
1163 cifs_dbg(FYI, "about to flush pages\n");
1164 /* should we flush first and last page first */
1165 truncate_inode_pages_range(&target_inode->i_data, destoff,
1166 PAGE_ALIGN(destoff + len)-1);
1168 if (target_tcon->ses->server->ops->duplicate_extents)
1169 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1170 smb_file_src, smb_file_target, off, len, destoff);
1174 /* force revalidate of size and timestamps of target file now
1175 that target is updated on the server */
1176 CIFS_I(target_inode)->time = 0;
1177 /* although unlocking in the reverse order from locking is not
1178 strictly necessary here it is a little cleaner to be consistent */
1179 unlock_two_nondirectories(src_inode, target_inode);
1182 return rc < 0 ? rc : len;
1185 ssize_t cifs_file_copychunk_range(unsigned int xid,
1186 struct file *src_file, loff_t off,
1187 struct file *dst_file, loff_t destoff,
1188 size_t len, unsigned int flags)
1190 struct inode *src_inode = file_inode(src_file);
1191 struct inode *target_inode = file_inode(dst_file);
1192 struct cifsFileInfo *smb_file_src;
1193 struct cifsFileInfo *smb_file_target;
1194 struct cifs_tcon *src_tcon;
1195 struct cifs_tcon *target_tcon;
1198 cifs_dbg(FYI, "copychunk range\n");
1200 if (!src_file->private_data || !dst_file->private_data) {
1202 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1207 smb_file_target = dst_file->private_data;
1208 smb_file_src = src_file->private_data;
1209 src_tcon = tlink_tcon(smb_file_src->tlink);
1210 target_tcon = tlink_tcon(smb_file_target->tlink);
1212 if (src_tcon->ses != target_tcon->ses) {
1213 cifs_dbg(VFS, "source and target of copy not on same server\n");
1218 if (!target_tcon->ses->server->ops->copychunk_range)
1222 * Note: cifs case is easier than btrfs since server responsible for
1223 * checks for proper open modes and file type and if it wants
1224 * server could even support copy of range where source = target
1226 lock_two_nondirectories(target_inode, src_inode);
1228 cifs_dbg(FYI, "about to flush pages\n");
1229 /* should we flush first and last page first */
1230 truncate_inode_pages(&target_inode->i_data, 0);
1232 rc = file_modified(dst_file);
1234 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1235 smb_file_src, smb_file_target, off, len, destoff);
1237 file_accessed(src_file);
1239 /* force revalidate of size and timestamps of target file now
1240 * that target is updated on the server
1242 CIFS_I(target_inode)->time = 0;
1243 /* although unlocking in the reverse order from locking is not
1244 * strictly necessary here it is a little cleaner to be consistent
1246 unlock_two_nondirectories(src_inode, target_inode);
1253 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1254 * is a dummy operation.
1256 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1258 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1264 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1265 struct file *dst_file, loff_t destoff,
1266 size_t len, unsigned int flags)
1268 unsigned int xid = get_xid();
1270 struct cifsFileInfo *cfile = dst_file->private_data;
1272 if (cfile->swapfile)
1275 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1279 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1280 rc = generic_copy_file_range(src_file, off, dst_file,
1281 destoff, len, flags);
1285 const struct file_operations cifs_file_ops = {
1286 .read_iter = cifs_loose_read_iter,
1287 .write_iter = cifs_file_write_iter,
1289 .release = cifs_close,
1291 .flock = cifs_flock,
1292 .fsync = cifs_fsync,
1293 .flush = cifs_flush,
1294 .mmap = cifs_file_mmap,
1295 .splice_read = generic_file_splice_read,
1296 .splice_write = iter_file_splice_write,
1297 .llseek = cifs_llseek,
1298 .unlocked_ioctl = cifs_ioctl,
1299 .copy_file_range = cifs_copy_file_range,
1300 .remap_file_range = cifs_remap_file_range,
1301 .setlease = cifs_setlease,
1302 .fallocate = cifs_fallocate,
1305 const struct file_operations cifs_file_strict_ops = {
1306 .read_iter = cifs_strict_readv,
1307 .write_iter = cifs_strict_writev,
1309 .release = cifs_close,
1311 .flock = cifs_flock,
1312 .fsync = cifs_strict_fsync,
1313 .flush = cifs_flush,
1314 .mmap = cifs_file_strict_mmap,
1315 .splice_read = generic_file_splice_read,
1316 .splice_write = iter_file_splice_write,
1317 .llseek = cifs_llseek,
1318 .unlocked_ioctl = cifs_ioctl,
1319 .copy_file_range = cifs_copy_file_range,
1320 .remap_file_range = cifs_remap_file_range,
1321 .setlease = cifs_setlease,
1322 .fallocate = cifs_fallocate,
1325 const struct file_operations cifs_file_direct_ops = {
1326 .read_iter = cifs_direct_readv,
1327 .write_iter = cifs_direct_writev,
1329 .release = cifs_close,
1331 .flock = cifs_flock,
1332 .fsync = cifs_fsync,
1333 .flush = cifs_flush,
1334 .mmap = cifs_file_mmap,
1335 .splice_read = generic_file_splice_read,
1336 .splice_write = iter_file_splice_write,
1337 .unlocked_ioctl = cifs_ioctl,
1338 .copy_file_range = cifs_copy_file_range,
1339 .remap_file_range = cifs_remap_file_range,
1340 .llseek = cifs_llseek,
1341 .setlease = cifs_setlease,
1342 .fallocate = cifs_fallocate,
1345 const struct file_operations cifs_file_nobrl_ops = {
1346 .read_iter = cifs_loose_read_iter,
1347 .write_iter = cifs_file_write_iter,
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 .llseek = cifs_llseek,
1356 .unlocked_ioctl = cifs_ioctl,
1357 .copy_file_range = cifs_copy_file_range,
1358 .remap_file_range = cifs_remap_file_range,
1359 .setlease = cifs_setlease,
1360 .fallocate = cifs_fallocate,
1363 const struct file_operations cifs_file_strict_nobrl_ops = {
1364 .read_iter = cifs_strict_readv,
1365 .write_iter = cifs_strict_writev,
1367 .release = cifs_close,
1368 .fsync = cifs_strict_fsync,
1369 .flush = cifs_flush,
1370 .mmap = cifs_file_strict_mmap,
1371 .splice_read = generic_file_splice_read,
1372 .splice_write = iter_file_splice_write,
1373 .llseek = cifs_llseek,
1374 .unlocked_ioctl = cifs_ioctl,
1375 .copy_file_range = cifs_copy_file_range,
1376 .remap_file_range = cifs_remap_file_range,
1377 .setlease = cifs_setlease,
1378 .fallocate = cifs_fallocate,
1381 const struct file_operations cifs_file_direct_nobrl_ops = {
1382 .read_iter = cifs_direct_readv,
1383 .write_iter = cifs_direct_writev,
1385 .release = cifs_close,
1386 .fsync = cifs_fsync,
1387 .flush = cifs_flush,
1388 .mmap = cifs_file_mmap,
1389 .splice_read = generic_file_splice_read,
1390 .splice_write = iter_file_splice_write,
1391 .unlocked_ioctl = cifs_ioctl,
1392 .copy_file_range = cifs_copy_file_range,
1393 .remap_file_range = cifs_remap_file_range,
1394 .llseek = cifs_llseek,
1395 .setlease = cifs_setlease,
1396 .fallocate = cifs_fallocate,
1399 const struct file_operations cifs_dir_ops = {
1400 .iterate_shared = cifs_readdir,
1401 .release = cifs_closedir,
1402 .read = generic_read_dir,
1403 .unlocked_ioctl = cifs_ioctl,
1404 .copy_file_range = cifs_copy_file_range,
1405 .remap_file_range = cifs_remap_file_range,
1406 .llseek = generic_file_llseek,
1407 .fsync = cifs_dir_fsync,
1411 cifs_init_once(void *inode)
1413 struct cifsInodeInfo *cifsi = inode;
1415 inode_init_once(&cifsi->vfs_inode);
1416 init_rwsem(&cifsi->lock_sem);
1420 cifs_init_inodecache(void)
1422 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1423 sizeof(struct cifsInodeInfo),
1424 0, (SLAB_RECLAIM_ACCOUNT|
1425 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1427 if (cifs_inode_cachep == NULL)
1434 cifs_destroy_inodecache(void)
1437 * Make sure all delayed rcu free inodes are flushed before we
1441 kmem_cache_destroy(cifs_inode_cachep);
1445 cifs_init_request_bufs(void)
1448 * SMB2 maximum header size is bigger than CIFS one - no problems to
1449 * allocate some more bytes for CIFS.
1451 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1453 if (CIFSMaxBufSize < 8192) {
1454 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1455 Unicode path name has to fit in any SMB/CIFS path based frames */
1456 CIFSMaxBufSize = 8192;
1457 } else if (CIFSMaxBufSize > 1024*127) {
1458 CIFSMaxBufSize = 1024 * 127;
1460 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1463 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1464 CIFSMaxBufSize, CIFSMaxBufSize);
1466 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1467 CIFSMaxBufSize + max_hdr_size, 0,
1468 SLAB_HWCACHE_ALIGN, 0,
1469 CIFSMaxBufSize + max_hdr_size,
1471 if (cifs_req_cachep == NULL)
1474 if (cifs_min_rcv < 1)
1476 else if (cifs_min_rcv > 64) {
1478 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1481 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1484 if (cifs_req_poolp == NULL) {
1485 kmem_cache_destroy(cifs_req_cachep);
1488 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1489 almost all handle based requests (but not write response, nor is it
1490 sufficient for path based requests). A smaller size would have
1491 been more efficient (compacting multiple slab items on one 4k page)
1492 for the case in which debug was on, but this larger size allows
1493 more SMBs to use small buffer alloc and is still much more
1494 efficient to alloc 1 per page off the slab compared to 17K (5page)
1495 alloc of large cifs buffers even when page debugging is on */
1496 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1497 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1498 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1499 if (cifs_sm_req_cachep == NULL) {
1500 mempool_destroy(cifs_req_poolp);
1501 kmem_cache_destroy(cifs_req_cachep);
1505 if (cifs_min_small < 2)
1507 else if (cifs_min_small > 256) {
1508 cifs_min_small = 256;
1509 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1512 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1513 cifs_sm_req_cachep);
1515 if (cifs_sm_req_poolp == NULL) {
1516 mempool_destroy(cifs_req_poolp);
1517 kmem_cache_destroy(cifs_req_cachep);
1518 kmem_cache_destroy(cifs_sm_req_cachep);
1526 cifs_destroy_request_bufs(void)
1528 mempool_destroy(cifs_req_poolp);
1529 kmem_cache_destroy(cifs_req_cachep);
1530 mempool_destroy(cifs_sm_req_poolp);
1531 kmem_cache_destroy(cifs_sm_req_cachep);
1535 cifs_init_mids(void)
1537 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1538 sizeof(struct mid_q_entry), 0,
1539 SLAB_HWCACHE_ALIGN, NULL);
1540 if (cifs_mid_cachep == NULL)
1543 /* 3 is a reasonable minimum number of simultaneous operations */
1544 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1545 if (cifs_mid_poolp == NULL) {
1546 kmem_cache_destroy(cifs_mid_cachep);
1554 cifs_destroy_mids(void)
1556 mempool_destroy(cifs_mid_poolp);
1557 kmem_cache_destroy(cifs_mid_cachep);
1565 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1567 * Initialize Global counters
1569 atomic_set(&sesInfoAllocCount, 0);
1570 atomic_set(&tconInfoAllocCount, 0);
1571 atomic_set(&tcpSesNextId, 0);
1572 atomic_set(&tcpSesAllocCount, 0);
1573 atomic_set(&tcpSesReconnectCount, 0);
1574 atomic_set(&tconInfoReconnectCount, 0);
1576 atomic_set(&bufAllocCount, 0);
1577 atomic_set(&smBufAllocCount, 0);
1578 #ifdef CONFIG_CIFS_STATS2
1579 atomic_set(&totBufAllocCount, 0);
1580 atomic_set(&totSmBufAllocCount, 0);
1581 if (slow_rsp_threshold < 1)
1582 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1583 else if (slow_rsp_threshold > 32767)
1585 "slow response threshold set higher than recommended (0 to 32767)\n");
1586 #endif /* CONFIG_CIFS_STATS2 */
1588 atomic_set(&midCount, 0);
1589 GlobalCurrentXid = 0;
1590 GlobalTotalActiveXid = 0;
1591 GlobalMaxActiveXid = 0;
1592 spin_lock_init(&cifs_tcp_ses_lock);
1593 spin_lock_init(&GlobalMid_Lock);
1595 cifs_lock_secret = get_random_u32();
1597 if (cifs_max_pending < 2) {
1598 cifs_max_pending = 2;
1599 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1600 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1601 cifs_max_pending = CIFS_MAX_REQ;
1602 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1606 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1609 goto out_clean_proc;
1613 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1614 * so that we don't launch too many worker threads but
1615 * Documentation/core-api/workqueue.rst recommends setting it to 0
1618 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1619 decrypt_wq = alloc_workqueue("smb3decryptd",
1620 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1623 goto out_destroy_cifsiod_wq;
1626 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1627 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1628 if (!fileinfo_put_wq) {
1630 goto out_destroy_decrypt_wq;
1633 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1634 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1635 if (!cifsoplockd_wq) {
1637 goto out_destroy_fileinfo_put_wq;
1640 deferredclose_wq = alloc_workqueue("deferredclose",
1641 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1642 if (!deferredclose_wq) {
1644 goto out_destroy_cifsoplockd_wq;
1647 rc = cifs_init_inodecache();
1649 goto out_destroy_deferredclose_wq;
1651 rc = cifs_init_mids();
1653 goto out_destroy_inodecache;
1655 rc = cifs_init_request_bufs();
1657 goto out_destroy_mids;
1659 #ifdef CONFIG_CIFS_DFS_UPCALL
1660 rc = dfs_cache_init();
1662 goto out_destroy_request_bufs;
1663 #endif /* CONFIG_CIFS_DFS_UPCALL */
1664 #ifdef CONFIG_CIFS_UPCALL
1665 rc = init_cifs_spnego();
1667 goto out_destroy_dfs_cache;
1668 #endif /* CONFIG_CIFS_UPCALL */
1669 #ifdef CONFIG_CIFS_SWN_UPCALL
1670 rc = cifs_genl_init();
1672 goto out_register_key_type;
1673 #endif /* CONFIG_CIFS_SWN_UPCALL */
1675 rc = init_cifs_idmap();
1677 goto out_cifs_swn_init;
1679 rc = register_filesystem(&cifs_fs_type);
1681 goto out_init_cifs_idmap;
1683 rc = register_filesystem(&smb3_fs_type);
1685 unregister_filesystem(&cifs_fs_type);
1686 goto out_init_cifs_idmap;
1691 out_init_cifs_idmap:
1694 #ifdef CONFIG_CIFS_SWN_UPCALL
1696 out_register_key_type:
1698 #ifdef CONFIG_CIFS_UPCALL
1700 out_destroy_dfs_cache:
1702 #ifdef CONFIG_CIFS_DFS_UPCALL
1703 dfs_cache_destroy();
1704 out_destroy_request_bufs:
1706 cifs_destroy_request_bufs();
1708 cifs_destroy_mids();
1709 out_destroy_inodecache:
1710 cifs_destroy_inodecache();
1711 out_destroy_deferredclose_wq:
1712 destroy_workqueue(deferredclose_wq);
1713 out_destroy_cifsoplockd_wq:
1714 destroy_workqueue(cifsoplockd_wq);
1715 out_destroy_fileinfo_put_wq:
1716 destroy_workqueue(fileinfo_put_wq);
1717 out_destroy_decrypt_wq:
1718 destroy_workqueue(decrypt_wq);
1719 out_destroy_cifsiod_wq:
1720 destroy_workqueue(cifsiod_wq);
1729 cifs_dbg(NOISY, "exit_smb3\n");
1730 unregister_filesystem(&cifs_fs_type);
1731 unregister_filesystem(&smb3_fs_type);
1732 cifs_dfs_release_automount_timer();
1734 #ifdef CONFIG_CIFS_SWN_UPCALL
1737 #ifdef CONFIG_CIFS_UPCALL
1740 #ifdef CONFIG_CIFS_DFS_UPCALL
1741 dfs_cache_destroy();
1743 cifs_destroy_request_bufs();
1744 cifs_destroy_mids();
1745 cifs_destroy_inodecache();
1746 destroy_workqueue(deferredclose_wq);
1747 destroy_workqueue(cifsoplockd_wq);
1748 destroy_workqueue(decrypt_wq);
1749 destroy_workqueue(fileinfo_put_wq);
1750 destroy_workqueue(cifsiod_wq);
1754 MODULE_AUTHOR("Steve French");
1755 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1757 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1758 "also older servers complying with the SNIA CIFS Specification)");
1759 MODULE_VERSION(CIFS_VERSION);
1760 MODULE_SOFTDEP("ecb");
1761 MODULE_SOFTDEP("hmac");
1762 MODULE_SOFTDEP("md5");
1763 MODULE_SOFTDEP("nls");
1764 MODULE_SOFTDEP("aes");
1765 MODULE_SOFTDEP("cmac");
1766 MODULE_SOFTDEP("sha256");
1767 MODULE_SOFTDEP("sha512");
1768 MODULE_SOFTDEP("aead2");
1769 MODULE_SOFTDEP("ccm");
1770 MODULE_SOFTDEP("gcm");
1771 module_init(init_cifs)
1772 module_exit(exit_cifs)