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"
49 #include "cached_dir.h"
52 * DOS dates from 1980/1/1 through 2107/12/31
53 * Protocol specifications indicate the range should be to 119, which
54 * limits maximum year to 2099. But this range has not been checked.
56 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
57 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
58 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
62 bool enable_oplocks = true;
63 bool linuxExtEnabled = true;
64 bool lookupCacheEnabled = true;
65 bool disable_legacy_dialects; /* false by default */
66 bool enable_gcm_256 = true;
67 bool require_gcm_256; /* false by default */
68 bool enable_negotiate_signing; /* false by default */
69 unsigned int global_secflags = CIFSSEC_DEF;
70 /* unsigned int ntlmv2_support = 0; */
71 unsigned int sign_CIFS_PDUs = 1;
74 * Global transaction id (XID) information
76 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
77 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
78 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
79 spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
82 * Global counters, updated atomically
84 atomic_t sesInfoAllocCount;
85 atomic_t tconInfoAllocCount;
86 atomic_t tcpSesNextId;
87 atomic_t tcpSesAllocCount;
88 atomic_t tcpSesReconnectCount;
89 atomic_t tconInfoReconnectCount;
92 atomic_t buf_alloc_count;
93 atomic_t small_buf_alloc_count;
94 #ifdef CONFIG_CIFS_STATS2
95 atomic_t total_buf_alloc_count;
96 atomic_t total_small_buf_alloc_count;
98 struct list_head cifs_tcp_ses_list;
99 spinlock_t cifs_tcp_ses_lock;
100 static const struct super_operations cifs_super_ops;
101 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
102 module_param(CIFSMaxBufSize, uint, 0444);
103 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
104 "for CIFS requests. "
105 "Default: 16384 Range: 8192 to 130048");
106 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
107 module_param(cifs_min_rcv, uint, 0444);
108 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
110 unsigned int cifs_min_small = 30;
111 module_param(cifs_min_small, uint, 0444);
112 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
114 unsigned int cifs_max_pending = CIFS_MAX_REQ;
115 module_param(cifs_max_pending, uint, 0444);
116 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
117 "CIFS/SMB1 dialect (N/A for SMB3) "
118 "Default: 32767 Range: 2 to 32767.");
119 #ifdef CONFIG_CIFS_STATS2
120 unsigned int slow_rsp_threshold = 1;
121 module_param(slow_rsp_threshold, uint, 0644);
122 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
123 "before logging that a response is delayed. "
124 "Default: 1 (if set to 0 disables msg).");
127 module_param(enable_oplocks, bool, 0644);
128 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
130 module_param(enable_gcm_256, bool, 0644);
131 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
133 module_param(require_gcm_256, bool, 0644);
134 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
136 module_param(enable_negotiate_signing, bool, 0644);
137 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
139 module_param(disable_legacy_dialects, bool, 0644);
140 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
141 "helpful to restrict the ability to "
142 "override the default dialects (SMB2.1, "
143 "SMB3 and SMB3.02) on mount with old "
144 "dialects (CIFS/SMB1 and SMB2) since "
145 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
146 " and less secure. Default: n/N/0");
148 extern mempool_t *cifs_sm_req_poolp;
149 extern mempool_t *cifs_req_poolp;
150 extern mempool_t *cifs_mid_poolp;
152 struct workqueue_struct *cifsiod_wq;
153 struct workqueue_struct *decrypt_wq;
154 struct workqueue_struct *fileinfo_put_wq;
155 struct workqueue_struct *cifsoplockd_wq;
156 struct workqueue_struct *deferredclose_wq;
157 __u32 cifs_lock_secret;
160 * Bumps refcount for cifs super block.
161 * Note that it should be only called if a referece to VFS super block is
162 * already held, e.g. in open-type syscalls context. Otherwise it can race with
163 * atomic_dec_and_test in deactivate_locked_super.
166 cifs_sb_active(struct super_block *sb)
168 struct cifs_sb_info *server = CIFS_SB(sb);
170 if (atomic_inc_return(&server->active) == 1)
171 atomic_inc(&sb->s_active);
175 cifs_sb_deactive(struct super_block *sb)
177 struct cifs_sb_info *server = CIFS_SB(sb);
179 if (atomic_dec_and_test(&server->active))
180 deactivate_super(sb);
184 cifs_read_super(struct super_block *sb)
187 struct cifs_sb_info *cifs_sb;
188 struct cifs_tcon *tcon;
189 struct timespec64 ts;
192 cifs_sb = CIFS_SB(sb);
193 tcon = cifs_sb_master_tcon(cifs_sb);
195 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
196 sb->s_flags |= SB_POSIXACL;
198 if (tcon->snapshot_time)
199 sb->s_flags |= SB_RDONLY;
201 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
202 sb->s_maxbytes = MAX_LFS_FILESIZE;
204 sb->s_maxbytes = MAX_NON_LFS;
207 * Some very old servers like DOS and OS/2 used 2 second granularity
208 * (while all current servers use 100ns granularity - see MS-DTYP)
209 * but 1 second is the maximum allowed granularity for the VFS
210 * so for old servers set time granularity to 1 second while for
211 * everything else (current servers) set it to 100ns.
213 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
214 ((tcon->ses->capabilities &
215 tcon->ses->server->vals->cap_nt_find) == 0) &&
217 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
218 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
219 sb->s_time_min = ts.tv_sec;
220 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
221 cpu_to_le16(SMB_TIME_MAX), 0);
222 sb->s_time_max = ts.tv_sec;
225 * Almost every server, including all SMB2+, uses DCE TIME
226 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
228 sb->s_time_gran = 100;
229 ts = cifs_NTtimeToUnix(0);
230 sb->s_time_min = ts.tv_sec;
231 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
232 sb->s_time_max = ts.tv_sec;
235 sb->s_magic = CIFS_SUPER_MAGIC;
236 sb->s_op = &cifs_super_ops;
237 sb->s_xattr = cifs_xattr_handlers;
238 rc = super_setup_bdi(sb);
241 /* tune readahead according to rsize if readahead size not set on mount */
242 if (cifs_sb->ctx->rsize == 0)
243 cifs_sb->ctx->rsize =
244 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
245 if (cifs_sb->ctx->rasize)
246 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
248 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
250 sb->s_blocksize = CIFS_MAX_MSGSIZE;
251 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
252 inode = cifs_root_iget(sb);
260 sb->s_d_op = &cifs_ci_dentry_ops;
262 sb->s_d_op = &cifs_dentry_ops;
264 sb->s_root = d_make_root(inode);
270 #ifdef CONFIG_CIFS_NFSD_EXPORT
271 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
272 cifs_dbg(FYI, "export ops supported\n");
273 sb->s_export_op = &cifs_export_ops;
275 #endif /* CONFIG_CIFS_NFSD_EXPORT */
280 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
284 static void cifs_kill_sb(struct super_block *sb)
286 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
289 * We ned to release all dentries for the cached directories
290 * before we kill the sb.
293 close_all_cached_dirs(cifs_sb);
295 /* finally release root dentry */
297 cifs_sb->root = NULL;
301 cifs_umount(cifs_sb);
305 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
307 struct super_block *sb = dentry->d_sb;
308 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
309 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
310 struct TCP_Server_Info *server = tcon->ses->server;
316 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
318 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
320 buf->f_namelen = PATH_MAX;
322 buf->f_fsid.val[0] = tcon->vol_serial_number;
323 /* are using part of create time for more randomness, see man statfs */
324 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
326 buf->f_files = 0; /* undefined */
327 buf->f_ffree = 0; /* unlimited */
329 if (server->ops->queryfs)
330 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
336 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
338 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
339 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
340 struct TCP_Server_Info *server = tcon->ses->server;
342 if (server->ops->fallocate)
343 return server->ops->fallocate(file, tcon, mode, off, len);
348 static int cifs_permission(struct user_namespace *mnt_userns,
349 struct inode *inode, int mask)
351 struct cifs_sb_info *cifs_sb;
353 cifs_sb = CIFS_SB(inode->i_sb);
355 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
356 if ((mask & MAY_EXEC) && !execute_ok(inode))
360 } else /* file mode might have been restricted at mount time
361 on the client (above and beyond ACL on servers) for
362 servers which do not support setting and viewing mode bits,
363 so allowing client to check permissions is useful */
364 return generic_permission(&init_user_ns, inode, mask);
367 static struct kmem_cache *cifs_inode_cachep;
368 static struct kmem_cache *cifs_req_cachep;
369 static struct kmem_cache *cifs_mid_cachep;
370 static struct kmem_cache *cifs_sm_req_cachep;
371 mempool_t *cifs_sm_req_poolp;
372 mempool_t *cifs_req_poolp;
373 mempool_t *cifs_mid_poolp;
375 static struct inode *
376 cifs_alloc_inode(struct super_block *sb)
378 struct cifsInodeInfo *cifs_inode;
379 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
382 cifs_inode->cifsAttrs = 0x20; /* default */
383 cifs_inode->time = 0;
385 * Until the file is open and we have gotten oplock info back from the
386 * server, can not assume caching of file data or metadata.
388 cifs_set_oplock_level(cifs_inode, 0);
389 cifs_inode->flags = 0;
390 spin_lock_init(&cifs_inode->writers_lock);
391 cifs_inode->writers = 0;
392 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
393 cifs_inode->server_eof = 0;
394 cifs_inode->uniqueid = 0;
395 cifs_inode->createtime = 0;
396 cifs_inode->epoch = 0;
397 spin_lock_init(&cifs_inode->open_file_lock);
398 generate_random_uuid(cifs_inode->lease_key);
399 cifs_inode->symlink_target = NULL;
402 * Can not set i_flags here - they get immediately overwritten to zero
405 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
406 INIT_LIST_HEAD(&cifs_inode->openFileList);
407 INIT_LIST_HEAD(&cifs_inode->llist);
408 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
409 spin_lock_init(&cifs_inode->deferred_lock);
410 return &cifs_inode->netfs.inode;
414 cifs_free_inode(struct inode *inode)
416 struct cifsInodeInfo *cinode = CIFS_I(inode);
418 if (S_ISLNK(inode->i_mode))
419 kfree(cinode->symlink_target);
420 kmem_cache_free(cifs_inode_cachep, cinode);
424 cifs_evict_inode(struct inode *inode)
426 truncate_inode_pages_final(&inode->i_data);
427 if (inode->i_state & I_PINNING_FSCACHE_WB)
428 cifs_fscache_unuse_inode_cookie(inode, true);
429 cifs_fscache_release_inode_cookie(inode);
434 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
436 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
437 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
439 seq_puts(s, ",addr=");
441 switch (server->dstaddr.ss_family) {
443 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
446 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
447 if (sa6->sin6_scope_id)
448 seq_printf(s, "%%%u", sa6->sin6_scope_id);
451 seq_puts(s, "(unknown)");
454 seq_puts(s, ",rdma");
458 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
460 if (ses->sectype == Unspecified) {
461 if (ses->user_name == NULL)
462 seq_puts(s, ",sec=none");
466 seq_puts(s, ",sec=");
468 switch (ses->sectype) {
470 seq_puts(s, "ntlmv2");
476 seq_puts(s, "ntlmssp");
479 /* shouldn't ever happen */
480 seq_puts(s, "unknown");
487 if (ses->sectype == Kerberos)
488 seq_printf(s, ",cruid=%u",
489 from_kuid_munged(&init_user_ns, ses->cred_uid));
493 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
495 seq_puts(s, ",cache=");
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
498 seq_puts(s, "strict");
499 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
501 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
502 seq_puts(s, "singleclient"); /* assume only one client access */
503 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
504 seq_puts(s, "ro"); /* read only caching assumed */
506 seq_puts(s, "loose");
510 * cifs_show_devname() is used so we show the mount device name with correct
511 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
513 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
515 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
516 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
521 convert_delimiter(devname, '/');
522 /* escape all spaces in share names */
523 seq_escape(m, devname, " \t");
530 * cifs_show_options() is for displaying mount options in /proc/mounts.
531 * Not all settable options are displayed but most of the important
535 cifs_show_options(struct seq_file *s, struct dentry *root)
537 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
538 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
539 struct sockaddr *srcaddr;
540 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
542 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
543 cifs_show_security(s, tcon->ses);
544 cifs_show_cache_flavor(s, cifs_sb);
547 seq_puts(s, ",nolease");
548 if (cifs_sb->ctx->multiuser)
549 seq_puts(s, ",multiuser");
550 else if (tcon->ses->user_name)
551 seq_show_option(s, "username", tcon->ses->user_name);
553 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
554 seq_show_option(s, "domain", tcon->ses->domainName);
556 if (srcaddr->sa_family != AF_UNSPEC) {
557 struct sockaddr_in *saddr4;
558 struct sockaddr_in6 *saddr6;
559 saddr4 = (struct sockaddr_in *)srcaddr;
560 saddr6 = (struct sockaddr_in6 *)srcaddr;
561 if (srcaddr->sa_family == AF_INET6)
562 seq_printf(s, ",srcaddr=%pI6c",
564 else if (srcaddr->sa_family == AF_INET)
565 seq_printf(s, ",srcaddr=%pI4",
566 &saddr4->sin_addr.s_addr);
568 seq_printf(s, ",srcaddr=BAD-AF:%i",
569 (int)(srcaddr->sa_family));
572 seq_printf(s, ",uid=%u",
573 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
575 seq_puts(s, ",forceuid");
577 seq_puts(s, ",noforceuid");
579 seq_printf(s, ",gid=%u",
580 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
582 seq_puts(s, ",forcegid");
584 seq_puts(s, ",noforcegid");
586 cifs_show_address(s, tcon->ses->server);
589 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
590 cifs_sb->ctx->file_mode,
591 cifs_sb->ctx->dir_mode);
592 if (cifs_sb->ctx->iocharset)
593 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
595 seq_puts(s, ",seal");
596 else if (tcon->ses->server->ignore_signature)
597 seq_puts(s, ",signloosely");
599 seq_puts(s, ",nocase");
601 seq_puts(s, ",nodelete");
602 if (cifs_sb->ctx->no_sparse)
603 seq_puts(s, ",nosparse");
604 if (tcon->local_lease)
605 seq_puts(s, ",locallease");
607 seq_puts(s, ",hard");
609 seq_puts(s, ",soft");
610 if (tcon->use_persistent)
611 seq_puts(s, ",persistenthandles");
612 else if (tcon->use_resilient)
613 seq_puts(s, ",resilienthandles");
614 if (tcon->posix_extensions)
615 seq_puts(s, ",posix");
616 else if (tcon->unix_ext)
617 seq_puts(s, ",unix");
619 seq_puts(s, ",nounix");
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
621 seq_puts(s, ",nodfs");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
623 seq_puts(s, ",posixpaths");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
625 seq_puts(s, ",setuids");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
627 seq_puts(s, ",idsfromsid");
628 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
629 seq_puts(s, ",serverino");
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
631 seq_puts(s, ",rwpidforward");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
633 seq_puts(s, ",forcemand");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
635 seq_puts(s, ",nouser_xattr");
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
637 seq_puts(s, ",mapchars");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
639 seq_puts(s, ",mapposix");
640 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
643 seq_puts(s, ",nobrl");
644 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
645 seq_puts(s, ",nohandlecache");
646 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
647 seq_puts(s, ",modefromsid");
648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
649 seq_puts(s, ",cifsacl");
650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
651 seq_puts(s, ",dynperm");
652 if (root->d_sb->s_flags & SB_POSIXACL)
654 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
655 seq_puts(s, ",mfsymlinks");
656 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
658 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
659 seq_puts(s, ",nostrictsync");
660 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
661 seq_puts(s, ",noperm");
662 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
663 seq_printf(s, ",backupuid=%u",
664 from_kuid_munged(&init_user_ns,
665 cifs_sb->ctx->backupuid));
666 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
667 seq_printf(s, ",backupgid=%u",
668 from_kgid_munged(&init_user_ns,
669 cifs_sb->ctx->backupgid));
671 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
672 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
673 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
674 if (cifs_sb->ctx->rasize)
675 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
676 if (tcon->ses->server->min_offload)
677 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
678 seq_printf(s, ",echo_interval=%lu",
679 tcon->ses->server->echo_interval / HZ);
681 /* Only display the following if overridden on mount */
682 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
683 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
684 if (tcon->ses->server->tcp_nodelay)
685 seq_puts(s, ",tcpnodelay");
686 if (tcon->ses->server->noautotune)
687 seq_puts(s, ",noautotune");
688 if (tcon->ses->server->noblocksnd)
689 seq_puts(s, ",noblocksend");
691 if (tcon->snapshot_time)
692 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
693 if (tcon->handle_timeout)
694 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
697 * Display file and directory attribute timeout in seconds.
698 * If file and directory attribute timeout the same then actimeo
699 * was likely specified on mount
701 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
702 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
704 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
705 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
707 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
709 if (tcon->ses->chan_max > 1)
710 seq_printf(s, ",multichannel,max_channels=%zu",
711 tcon->ses->chan_max);
713 if (tcon->use_witness)
714 seq_puts(s, ",witness");
719 static void cifs_umount_begin(struct super_block *sb)
721 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
722 struct cifs_tcon *tcon;
727 tcon = cifs_sb_master_tcon(cifs_sb);
729 spin_lock(&cifs_tcp_ses_lock);
730 spin_lock(&tcon->tc_lock);
731 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
732 /* we have other mounts to same share or we have
733 already tried to umount this and woken up
734 all waiting network requests, nothing to do */
735 spin_unlock(&tcon->tc_lock);
736 spin_unlock(&cifs_tcp_ses_lock);
740 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
741 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
743 spin_unlock(&tcon->tc_lock);
744 spin_unlock(&cifs_tcp_ses_lock);
746 cifs_close_all_deferred_files(tcon);
747 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
748 /* cancel_notify_requests(tcon); */
749 if (tcon->ses && tcon->ses->server) {
750 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
751 wake_up_all(&tcon->ses->server->request_q);
752 wake_up_all(&tcon->ses->server->response_q);
753 msleep(1); /* yield */
754 /* we have to kick the requests once more */
755 wake_up_all(&tcon->ses->server->response_q);
762 static int cifs_freeze(struct super_block *sb)
764 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
765 struct cifs_tcon *tcon;
770 tcon = cifs_sb_master_tcon(cifs_sb);
772 cifs_close_all_deferred_files(tcon);
776 #ifdef CONFIG_CIFS_STATS2
777 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
784 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
786 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
790 static int cifs_drop_inode(struct inode *inode)
792 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
794 /* no serverino => unconditional eviction */
795 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
796 generic_drop_inode(inode);
799 static const struct super_operations cifs_super_ops = {
800 .statfs = cifs_statfs,
801 .alloc_inode = cifs_alloc_inode,
802 .write_inode = cifs_write_inode,
803 .free_inode = cifs_free_inode,
804 .drop_inode = cifs_drop_inode,
805 .evict_inode = cifs_evict_inode,
806 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
807 .show_devname = cifs_show_devname,
808 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
809 function unless later we add lazy close of inodes or unless the
810 kernel forgets to call us with the same number of releases (closes)
812 .show_options = cifs_show_options,
813 .umount_begin = cifs_umount_begin,
814 .freeze_fs = cifs_freeze,
815 #ifdef CONFIG_CIFS_STATS2
816 .show_stats = cifs_show_stats,
821 * Get root dentry from superblock according to prefix path mount option.
822 * Return dentry with refcount + 1 on success and NULL otherwise.
824 static struct dentry *
825 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
827 struct dentry *dentry;
828 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
829 char *full_path = NULL;
833 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
834 return dget(sb->s_root);
836 full_path = cifs_build_path_to_root(ctx, cifs_sb,
837 cifs_sb_master_tcon(cifs_sb), 0);
838 if (full_path == NULL)
839 return ERR_PTR(-ENOMEM);
841 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
843 sep = CIFS_DIR_SEP(cifs_sb);
844 dentry = dget(sb->s_root);
848 struct inode *dir = d_inode(dentry);
849 struct dentry *child;
851 if (!S_ISDIR(dir->i_mode)) {
853 dentry = ERR_PTR(-ENOTDIR);
857 /* skip separators */
864 while (*s && *s != sep)
867 child = lookup_positive_unlocked(p, dentry, s - p);
870 } while (!IS_ERR(dentry));
875 static int cifs_set_super(struct super_block *sb, void *data)
877 struct cifs_mnt_data *mnt_data = data;
878 sb->s_fs_info = mnt_data->cifs_sb;
879 return set_anon_super(sb, NULL);
883 cifs_smb3_do_mount(struct file_system_type *fs_type,
884 int flags, struct smb3_fs_context *old_ctx)
886 struct cifs_mnt_data mnt_data;
887 struct cifs_sb_info *cifs_sb;
888 struct super_block *sb;
893 * Prints in Kernel / CIFS log the attempted mount operation
894 * If CIFS_DEBUG && cifs_FYI
897 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
899 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
901 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
903 return ERR_PTR(-ENOMEM);
905 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
907 root = ERR_PTR(-ENOMEM);
910 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
916 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
922 rc = cifs_setup_cifs_sb(cifs_sb);
928 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
930 if (!(flags & SB_SILENT))
931 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
937 mnt_data.ctx = cifs_sb->ctx;
938 mnt_data.cifs_sb = cifs_sb;
939 mnt_data.flags = flags;
941 /* BB should we make this contingent on mount parm? */
942 flags |= SB_NODIRATIME | SB_NOATIME;
944 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
946 cifs_umount(cifs_sb);
951 cifs_dbg(FYI, "Use existing superblock\n");
952 cifs_umount(cifs_sb);
955 rc = cifs_read_super(sb);
961 sb->s_flags |= SB_ACTIVE;
964 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
969 cifs_sb->root = dget(root);
971 cifs_dbg(FYI, "dentry root is: %p\n", root);
975 deactivate_locked_super(sb);
978 kfree(cifs_sb->prepath);
979 smb3_cleanup_fs_context(cifs_sb->ctx);
986 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
989 struct inode *inode = file_inode(iocb->ki_filp);
991 if (iocb->ki_flags & IOCB_DIRECT)
992 return cifs_user_readv(iocb, iter);
994 rc = cifs_revalidate_mapping(inode);
998 return generic_file_read_iter(iocb, iter);
1001 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1003 struct inode *inode = file_inode(iocb->ki_filp);
1004 struct cifsInodeInfo *cinode = CIFS_I(inode);
1008 if (iocb->ki_filp->f_flags & O_DIRECT) {
1009 written = cifs_user_writev(iocb, from);
1010 if (written > 0 && CIFS_CACHE_READ(cinode)) {
1011 cifs_zap_mapping(inode);
1013 "Set no oplock for inode=%p after a write operation\n",
1020 written = cifs_get_writer(cinode);
1024 written = generic_file_write_iter(iocb, from);
1026 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
1029 rc = filemap_fdatawrite(inode->i_mapping);
1031 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1035 cifs_put_writer(cinode);
1039 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1041 struct cifsFileInfo *cfile = file->private_data;
1042 struct cifs_tcon *tcon;
1045 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1046 * the cached file length
1048 if (whence != SEEK_SET && whence != SEEK_CUR) {
1050 struct inode *inode = file_inode(file);
1053 * We need to be sure that all dirty pages are written and the
1054 * server has the newest file length.
1056 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1057 inode->i_mapping->nrpages != 0) {
1058 rc = filemap_fdatawait(inode->i_mapping);
1060 mapping_set_error(inode->i_mapping, rc);
1065 * Some applications poll for the file length in this strange
1066 * way so we must seek to end on non-oplocked files by
1067 * setting the revalidate time to zero.
1069 CIFS_I(inode)->time = 0;
1071 rc = cifs_revalidate_file_attr(file);
1075 if (cfile && cfile->tlink) {
1076 tcon = tlink_tcon(cfile->tlink);
1077 if (tcon->ses->server->ops->llseek)
1078 return tcon->ses->server->ops->llseek(file, tcon,
1081 return generic_file_llseek(file, offset, whence);
1085 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1088 * Note that this is called by vfs setlease with i_lock held to
1089 * protect *lease from going away.
1091 struct inode *inode = file_inode(file);
1092 struct cifsFileInfo *cfile = file->private_data;
1094 if (!(S_ISREG(inode->i_mode)))
1097 /* Check if file is oplocked if this is request for new lease */
1098 if (arg == F_UNLCK ||
1099 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1100 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1101 return generic_setlease(file, arg, lease, priv);
1102 else if (tlink_tcon(cfile->tlink)->local_lease &&
1103 !CIFS_CACHE_READ(CIFS_I(inode)))
1105 * If the server claims to support oplock on this file, then we
1106 * still need to check oplock even if the local_lease mount
1107 * option is set, but there are servers which do not support
1108 * oplock for which this mount option may be useful if the user
1109 * knows that the file won't be changed on the server by anyone
1112 return generic_setlease(file, arg, lease, priv);
1117 struct file_system_type cifs_fs_type = {
1118 .owner = THIS_MODULE,
1120 .init_fs_context = smb3_init_fs_context,
1121 .parameters = smb3_fs_parameters,
1122 .kill_sb = cifs_kill_sb,
1123 .fs_flags = FS_RENAME_DOES_D_MOVE,
1125 MODULE_ALIAS_FS("cifs");
1127 struct file_system_type smb3_fs_type = {
1128 .owner = THIS_MODULE,
1130 .init_fs_context = smb3_init_fs_context,
1131 .parameters = smb3_fs_parameters,
1132 .kill_sb = cifs_kill_sb,
1133 .fs_flags = FS_RENAME_DOES_D_MOVE,
1135 MODULE_ALIAS_FS("smb3");
1136 MODULE_ALIAS("smb3");
1138 const struct inode_operations cifs_dir_inode_ops = {
1139 .create = cifs_create,
1140 .atomic_open = cifs_atomic_open,
1141 .lookup = cifs_lookup,
1142 .getattr = cifs_getattr,
1143 .unlink = cifs_unlink,
1144 .link = cifs_hardlink,
1145 .mkdir = cifs_mkdir,
1146 .rmdir = cifs_rmdir,
1147 .rename = cifs_rename2,
1148 .permission = cifs_permission,
1149 .setattr = cifs_setattr,
1150 .symlink = cifs_symlink,
1151 .mknod = cifs_mknod,
1152 .listxattr = cifs_listxattr,
1155 const struct inode_operations cifs_file_inode_ops = {
1156 .setattr = cifs_setattr,
1157 .getattr = cifs_getattr,
1158 .permission = cifs_permission,
1159 .listxattr = cifs_listxattr,
1160 .fiemap = cifs_fiemap,
1163 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1164 struct delayed_call *done)
1168 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1170 return ERR_PTR(-ENOMEM);
1172 spin_lock(&inode->i_lock);
1173 if (likely(CIFS_I(inode)->symlink_target)) {
1174 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1177 target_path = ERR_PTR(-EOPNOTSUPP);
1179 spin_unlock(&inode->i_lock);
1181 if (!IS_ERR(target_path))
1182 set_delayed_call(done, kfree_link, target_path);
1187 const struct inode_operations cifs_symlink_inode_ops = {
1188 .get_link = cifs_get_link,
1189 .setattr = cifs_setattr,
1190 .permission = cifs_permission,
1191 .listxattr = cifs_listxattr,
1194 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1195 struct file *dst_file, loff_t destoff, loff_t len,
1196 unsigned int remap_flags)
1198 struct inode *src_inode = file_inode(src_file);
1199 struct inode *target_inode = file_inode(dst_file);
1200 struct cifsFileInfo *smb_file_src = src_file->private_data;
1201 struct cifsFileInfo *smb_file_target;
1202 struct cifs_tcon *target_tcon;
1206 if (remap_flags & REMAP_FILE_DEDUP)
1208 if (remap_flags & ~REMAP_FILE_ADVISORY)
1211 cifs_dbg(FYI, "clone range\n");
1215 if (!src_file->private_data || !dst_file->private_data) {
1217 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1221 smb_file_target = dst_file->private_data;
1222 target_tcon = tlink_tcon(smb_file_target->tlink);
1225 * Note: cifs case is easier than btrfs since server responsible for
1226 * checks for proper open modes and file type and if it wants
1227 * server could even support copy of range where source = target
1229 lock_two_nondirectories(target_inode, src_inode);
1232 len = src_inode->i_size - off;
1234 cifs_dbg(FYI, "about to flush pages\n");
1235 /* should we flush first and last page first */
1236 truncate_inode_pages_range(&target_inode->i_data, destoff,
1237 PAGE_ALIGN(destoff + len)-1);
1239 if (target_tcon->ses->server->ops->duplicate_extents)
1240 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1241 smb_file_src, smb_file_target, off, len, destoff);
1245 /* force revalidate of size and timestamps of target file now
1246 that target is updated on the server */
1247 CIFS_I(target_inode)->time = 0;
1248 /* although unlocking in the reverse order from locking is not
1249 strictly necessary here it is a little cleaner to be consistent */
1250 unlock_two_nondirectories(src_inode, target_inode);
1253 return rc < 0 ? rc : len;
1256 ssize_t cifs_file_copychunk_range(unsigned int xid,
1257 struct file *src_file, loff_t off,
1258 struct file *dst_file, loff_t destoff,
1259 size_t len, unsigned int flags)
1261 struct inode *src_inode = file_inode(src_file);
1262 struct inode *target_inode = file_inode(dst_file);
1263 struct cifsFileInfo *smb_file_src;
1264 struct cifsFileInfo *smb_file_target;
1265 struct cifs_tcon *src_tcon;
1266 struct cifs_tcon *target_tcon;
1269 cifs_dbg(FYI, "copychunk range\n");
1271 if (!src_file->private_data || !dst_file->private_data) {
1273 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1278 smb_file_target = dst_file->private_data;
1279 smb_file_src = src_file->private_data;
1280 src_tcon = tlink_tcon(smb_file_src->tlink);
1281 target_tcon = tlink_tcon(smb_file_target->tlink);
1283 if (src_tcon->ses != target_tcon->ses) {
1284 cifs_dbg(VFS, "source and target of copy not on same server\n");
1289 if (!target_tcon->ses->server->ops->copychunk_range)
1293 * Note: cifs case is easier than btrfs since server responsible for
1294 * checks for proper open modes and file type and if it wants
1295 * server could even support copy of range where source = target
1297 lock_two_nondirectories(target_inode, src_inode);
1299 cifs_dbg(FYI, "about to flush pages\n");
1301 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1306 /* should we flush first and last page first */
1307 truncate_inode_pages(&target_inode->i_data, 0);
1309 rc = file_modified(dst_file);
1311 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1312 smb_file_src, smb_file_target, off, len, destoff);
1314 file_accessed(src_file);
1316 /* force revalidate of size and timestamps of target file now
1317 * that target is updated on the server
1319 CIFS_I(target_inode)->time = 0;
1322 /* although unlocking in the reverse order from locking is not
1323 * strictly necessary here it is a little cleaner to be consistent
1325 unlock_two_nondirectories(src_inode, target_inode);
1332 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1333 * is a dummy operation.
1335 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1337 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1343 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1344 struct file *dst_file, loff_t destoff,
1345 size_t len, unsigned int flags)
1347 unsigned int xid = get_xid();
1349 struct cifsFileInfo *cfile = dst_file->private_data;
1351 if (cfile->swapfile) {
1357 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1361 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1362 rc = generic_copy_file_range(src_file, off, dst_file,
1363 destoff, len, flags);
1367 const struct file_operations cifs_file_ops = {
1368 .read_iter = cifs_loose_read_iter,
1369 .write_iter = cifs_file_write_iter,
1371 .release = cifs_close,
1373 .flock = cifs_flock,
1374 .fsync = cifs_fsync,
1375 .flush = cifs_flush,
1376 .mmap = cifs_file_mmap,
1377 .splice_read = generic_file_splice_read,
1378 .splice_write = iter_file_splice_write,
1379 .llseek = cifs_llseek,
1380 .unlocked_ioctl = cifs_ioctl,
1381 .copy_file_range = cifs_copy_file_range,
1382 .remap_file_range = cifs_remap_file_range,
1383 .setlease = cifs_setlease,
1384 .fallocate = cifs_fallocate,
1387 const struct file_operations cifs_file_strict_ops = {
1388 .read_iter = cifs_strict_readv,
1389 .write_iter = cifs_strict_writev,
1391 .release = cifs_close,
1393 .flock = cifs_flock,
1394 .fsync = cifs_strict_fsync,
1395 .flush = cifs_flush,
1396 .mmap = cifs_file_strict_mmap,
1397 .splice_read = generic_file_splice_read,
1398 .splice_write = iter_file_splice_write,
1399 .llseek = cifs_llseek,
1400 .unlocked_ioctl = cifs_ioctl,
1401 .copy_file_range = cifs_copy_file_range,
1402 .remap_file_range = cifs_remap_file_range,
1403 .setlease = cifs_setlease,
1404 .fallocate = cifs_fallocate,
1407 const struct file_operations cifs_file_direct_ops = {
1408 .read_iter = cifs_direct_readv,
1409 .write_iter = cifs_direct_writev,
1411 .release = cifs_close,
1413 .flock = cifs_flock,
1414 .fsync = cifs_fsync,
1415 .flush = cifs_flush,
1416 .mmap = cifs_file_mmap,
1417 .splice_read = generic_file_splice_read,
1418 .splice_write = iter_file_splice_write,
1419 .unlocked_ioctl = cifs_ioctl,
1420 .copy_file_range = cifs_copy_file_range,
1421 .remap_file_range = cifs_remap_file_range,
1422 .llseek = cifs_llseek,
1423 .setlease = cifs_setlease,
1424 .fallocate = cifs_fallocate,
1427 const struct file_operations cifs_file_nobrl_ops = {
1428 .read_iter = cifs_loose_read_iter,
1429 .write_iter = cifs_file_write_iter,
1431 .release = cifs_close,
1432 .fsync = cifs_fsync,
1433 .flush = cifs_flush,
1434 .mmap = cifs_file_mmap,
1435 .splice_read = generic_file_splice_read,
1436 .splice_write = iter_file_splice_write,
1437 .llseek = cifs_llseek,
1438 .unlocked_ioctl = cifs_ioctl,
1439 .copy_file_range = cifs_copy_file_range,
1440 .remap_file_range = cifs_remap_file_range,
1441 .setlease = cifs_setlease,
1442 .fallocate = cifs_fallocate,
1445 const struct file_operations cifs_file_strict_nobrl_ops = {
1446 .read_iter = cifs_strict_readv,
1447 .write_iter = cifs_strict_writev,
1449 .release = cifs_close,
1450 .fsync = cifs_strict_fsync,
1451 .flush = cifs_flush,
1452 .mmap = cifs_file_strict_mmap,
1453 .splice_read = generic_file_splice_read,
1454 .splice_write = iter_file_splice_write,
1455 .llseek = cifs_llseek,
1456 .unlocked_ioctl = cifs_ioctl,
1457 .copy_file_range = cifs_copy_file_range,
1458 .remap_file_range = cifs_remap_file_range,
1459 .setlease = cifs_setlease,
1460 .fallocate = cifs_fallocate,
1463 const struct file_operations cifs_file_direct_nobrl_ops = {
1464 .read_iter = cifs_direct_readv,
1465 .write_iter = cifs_direct_writev,
1467 .release = cifs_close,
1468 .fsync = cifs_fsync,
1469 .flush = cifs_flush,
1470 .mmap = cifs_file_mmap,
1471 .splice_read = generic_file_splice_read,
1472 .splice_write = iter_file_splice_write,
1473 .unlocked_ioctl = cifs_ioctl,
1474 .copy_file_range = cifs_copy_file_range,
1475 .remap_file_range = cifs_remap_file_range,
1476 .llseek = cifs_llseek,
1477 .setlease = cifs_setlease,
1478 .fallocate = cifs_fallocate,
1481 const struct file_operations cifs_dir_ops = {
1482 .iterate_shared = cifs_readdir,
1483 .release = cifs_closedir,
1484 .read = generic_read_dir,
1485 .unlocked_ioctl = cifs_ioctl,
1486 .copy_file_range = cifs_copy_file_range,
1487 .remap_file_range = cifs_remap_file_range,
1488 .llseek = generic_file_llseek,
1489 .fsync = cifs_dir_fsync,
1493 cifs_init_once(void *inode)
1495 struct cifsInodeInfo *cifsi = inode;
1497 inode_init_once(&cifsi->netfs.inode);
1498 init_rwsem(&cifsi->lock_sem);
1502 cifs_init_inodecache(void)
1504 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1505 sizeof(struct cifsInodeInfo),
1506 0, (SLAB_RECLAIM_ACCOUNT|
1507 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1509 if (cifs_inode_cachep == NULL)
1516 cifs_destroy_inodecache(void)
1519 * Make sure all delayed rcu free inodes are flushed before we
1523 kmem_cache_destroy(cifs_inode_cachep);
1527 cifs_init_request_bufs(void)
1530 * SMB2 maximum header size is bigger than CIFS one - no problems to
1531 * allocate some more bytes for CIFS.
1533 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1535 if (CIFSMaxBufSize < 8192) {
1536 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1537 Unicode path name has to fit in any SMB/CIFS path based frames */
1538 CIFSMaxBufSize = 8192;
1539 } else if (CIFSMaxBufSize > 1024*127) {
1540 CIFSMaxBufSize = 1024 * 127;
1542 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1545 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1546 CIFSMaxBufSize, CIFSMaxBufSize);
1548 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1549 CIFSMaxBufSize + max_hdr_size, 0,
1550 SLAB_HWCACHE_ALIGN, 0,
1551 CIFSMaxBufSize + max_hdr_size,
1553 if (cifs_req_cachep == NULL)
1556 if (cifs_min_rcv < 1)
1558 else if (cifs_min_rcv > 64) {
1560 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1563 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1566 if (cifs_req_poolp == NULL) {
1567 kmem_cache_destroy(cifs_req_cachep);
1570 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1571 almost all handle based requests (but not write response, nor is it
1572 sufficient for path based requests). A smaller size would have
1573 been more efficient (compacting multiple slab items on one 4k page)
1574 for the case in which debug was on, but this larger size allows
1575 more SMBs to use small buffer alloc and is still much more
1576 efficient to alloc 1 per page off the slab compared to 17K (5page)
1577 alloc of large cifs buffers even when page debugging is on */
1578 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1579 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1580 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1581 if (cifs_sm_req_cachep == NULL) {
1582 mempool_destroy(cifs_req_poolp);
1583 kmem_cache_destroy(cifs_req_cachep);
1587 if (cifs_min_small < 2)
1589 else if (cifs_min_small > 256) {
1590 cifs_min_small = 256;
1591 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1594 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1595 cifs_sm_req_cachep);
1597 if (cifs_sm_req_poolp == NULL) {
1598 mempool_destroy(cifs_req_poolp);
1599 kmem_cache_destroy(cifs_req_cachep);
1600 kmem_cache_destroy(cifs_sm_req_cachep);
1608 cifs_destroy_request_bufs(void)
1610 mempool_destroy(cifs_req_poolp);
1611 kmem_cache_destroy(cifs_req_cachep);
1612 mempool_destroy(cifs_sm_req_poolp);
1613 kmem_cache_destroy(cifs_sm_req_cachep);
1616 static int init_mids(void)
1618 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1619 sizeof(struct mid_q_entry), 0,
1620 SLAB_HWCACHE_ALIGN, NULL);
1621 if (cifs_mid_cachep == NULL)
1624 /* 3 is a reasonable minimum number of simultaneous operations */
1625 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1626 if (cifs_mid_poolp == NULL) {
1627 kmem_cache_destroy(cifs_mid_cachep);
1634 static void destroy_mids(void)
1636 mempool_destroy(cifs_mid_poolp);
1637 kmem_cache_destroy(cifs_mid_cachep);
1645 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1647 * Initialize Global counters
1649 atomic_set(&sesInfoAllocCount, 0);
1650 atomic_set(&tconInfoAllocCount, 0);
1651 atomic_set(&tcpSesNextId, 0);
1652 atomic_set(&tcpSesAllocCount, 0);
1653 atomic_set(&tcpSesReconnectCount, 0);
1654 atomic_set(&tconInfoReconnectCount, 0);
1656 atomic_set(&buf_alloc_count, 0);
1657 atomic_set(&small_buf_alloc_count, 0);
1658 #ifdef CONFIG_CIFS_STATS2
1659 atomic_set(&total_buf_alloc_count, 0);
1660 atomic_set(&total_small_buf_alloc_count, 0);
1661 if (slow_rsp_threshold < 1)
1662 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1663 else if (slow_rsp_threshold > 32767)
1665 "slow response threshold set higher than recommended (0 to 32767)\n");
1666 #endif /* CONFIG_CIFS_STATS2 */
1668 atomic_set(&mid_count, 0);
1669 GlobalCurrentXid = 0;
1670 GlobalTotalActiveXid = 0;
1671 GlobalMaxActiveXid = 0;
1672 spin_lock_init(&cifs_tcp_ses_lock);
1673 spin_lock_init(&GlobalMid_Lock);
1675 cifs_lock_secret = get_random_u32();
1677 if (cifs_max_pending < 2) {
1678 cifs_max_pending = 2;
1679 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1680 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1681 cifs_max_pending = CIFS_MAX_REQ;
1682 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1686 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1689 goto out_clean_proc;
1693 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1694 * so that we don't launch too many worker threads but
1695 * Documentation/core-api/workqueue.rst recommends setting it to 0
1698 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1699 decrypt_wq = alloc_workqueue("smb3decryptd",
1700 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1703 goto out_destroy_cifsiod_wq;
1706 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1707 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1708 if (!fileinfo_put_wq) {
1710 goto out_destroy_decrypt_wq;
1713 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1714 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1715 if (!cifsoplockd_wq) {
1717 goto out_destroy_fileinfo_put_wq;
1720 deferredclose_wq = alloc_workqueue("deferredclose",
1721 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1722 if (!deferredclose_wq) {
1724 goto out_destroy_cifsoplockd_wq;
1727 rc = cifs_init_inodecache();
1729 goto out_destroy_deferredclose_wq;
1733 goto out_destroy_inodecache;
1735 rc = cifs_init_request_bufs();
1737 goto out_destroy_mids;
1739 #ifdef CONFIG_CIFS_DFS_UPCALL
1740 rc = dfs_cache_init();
1742 goto out_destroy_request_bufs;
1743 #endif /* CONFIG_CIFS_DFS_UPCALL */
1744 #ifdef CONFIG_CIFS_UPCALL
1745 rc = init_cifs_spnego();
1747 goto out_destroy_dfs_cache;
1748 #endif /* CONFIG_CIFS_UPCALL */
1749 #ifdef CONFIG_CIFS_SWN_UPCALL
1750 rc = cifs_genl_init();
1752 goto out_register_key_type;
1753 #endif /* CONFIG_CIFS_SWN_UPCALL */
1755 rc = init_cifs_idmap();
1757 goto out_cifs_swn_init;
1759 rc = register_filesystem(&cifs_fs_type);
1761 goto out_init_cifs_idmap;
1763 rc = register_filesystem(&smb3_fs_type);
1765 unregister_filesystem(&cifs_fs_type);
1766 goto out_init_cifs_idmap;
1771 out_init_cifs_idmap:
1774 #ifdef CONFIG_CIFS_SWN_UPCALL
1776 out_register_key_type:
1778 #ifdef CONFIG_CIFS_UPCALL
1780 out_destroy_dfs_cache:
1782 #ifdef CONFIG_CIFS_DFS_UPCALL
1783 dfs_cache_destroy();
1784 out_destroy_request_bufs:
1786 cifs_destroy_request_bufs();
1789 out_destroy_inodecache:
1790 cifs_destroy_inodecache();
1791 out_destroy_deferredclose_wq:
1792 destroy_workqueue(deferredclose_wq);
1793 out_destroy_cifsoplockd_wq:
1794 destroy_workqueue(cifsoplockd_wq);
1795 out_destroy_fileinfo_put_wq:
1796 destroy_workqueue(fileinfo_put_wq);
1797 out_destroy_decrypt_wq:
1798 destroy_workqueue(decrypt_wq);
1799 out_destroy_cifsiod_wq:
1800 destroy_workqueue(cifsiod_wq);
1809 cifs_dbg(NOISY, "exit_smb3\n");
1810 unregister_filesystem(&cifs_fs_type);
1811 unregister_filesystem(&smb3_fs_type);
1812 cifs_dfs_release_automount_timer();
1814 #ifdef CONFIG_CIFS_SWN_UPCALL
1817 #ifdef CONFIG_CIFS_UPCALL
1820 #ifdef CONFIG_CIFS_DFS_UPCALL
1821 dfs_cache_destroy();
1823 cifs_destroy_request_bufs();
1825 cifs_destroy_inodecache();
1826 destroy_workqueue(deferredclose_wq);
1827 destroy_workqueue(cifsoplockd_wq);
1828 destroy_workqueue(decrypt_wq);
1829 destroy_workqueue(fileinfo_put_wq);
1830 destroy_workqueue(cifsiod_wq);
1834 MODULE_AUTHOR("Steve French");
1835 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1837 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1838 "also older servers complying with the SNIA CIFS Specification)");
1839 MODULE_VERSION(CIFS_VERSION);
1840 MODULE_SOFTDEP("ecb");
1841 MODULE_SOFTDEP("hmac");
1842 MODULE_SOFTDEP("md5");
1843 MODULE_SOFTDEP("nls");
1844 MODULE_SOFTDEP("aes");
1845 MODULE_SOFTDEP("cmac");
1846 MODULE_SOFTDEP("sha256");
1847 MODULE_SOFTDEP("sha512");
1848 MODULE_SOFTDEP("aead2");
1849 MODULE_SOFTDEP("ccm");
1850 MODULE_SOFTDEP("gcm");
1851 module_init(init_cifs)
1852 module_exit(exit_cifs)