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 force 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);
738 } else if (tcon->tc_count == 1)
739 tcon->status = TID_EXITING;
740 spin_unlock(&tcon->tc_lock);
741 spin_unlock(&cifs_tcp_ses_lock);
743 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
744 /* cancel_notify_requests(tcon); */
745 if (tcon->ses && tcon->ses->server) {
746 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
747 wake_up_all(&tcon->ses->server->request_q);
748 wake_up_all(&tcon->ses->server->response_q);
749 msleep(1); /* yield */
750 /* we have to kick the requests once more */
751 wake_up_all(&tcon->ses->server->response_q);
758 #ifdef CONFIG_CIFS_STATS2
759 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
766 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
768 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
772 static int cifs_drop_inode(struct inode *inode)
774 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
776 /* no serverino => unconditional eviction */
777 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
778 generic_drop_inode(inode);
781 static const struct super_operations cifs_super_ops = {
782 .statfs = cifs_statfs,
783 .alloc_inode = cifs_alloc_inode,
784 .write_inode = cifs_write_inode,
785 .free_inode = cifs_free_inode,
786 .drop_inode = cifs_drop_inode,
787 .evict_inode = cifs_evict_inode,
788 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
789 .show_devname = cifs_show_devname,
790 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
791 function unless later we add lazy close of inodes or unless the
792 kernel forgets to call us with the same number of releases (closes)
794 .show_options = cifs_show_options,
795 .umount_begin = cifs_umount_begin,
796 #ifdef CONFIG_CIFS_STATS2
797 .show_stats = cifs_show_stats,
802 * Get root dentry from superblock according to prefix path mount option.
803 * Return dentry with refcount + 1 on success and NULL otherwise.
805 static struct dentry *
806 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
808 struct dentry *dentry;
809 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
810 char *full_path = NULL;
814 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
815 return dget(sb->s_root);
817 full_path = cifs_build_path_to_root(ctx, cifs_sb,
818 cifs_sb_master_tcon(cifs_sb), 0);
819 if (full_path == NULL)
820 return ERR_PTR(-ENOMEM);
822 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
824 sep = CIFS_DIR_SEP(cifs_sb);
825 dentry = dget(sb->s_root);
829 struct inode *dir = d_inode(dentry);
830 struct dentry *child;
832 if (!S_ISDIR(dir->i_mode)) {
834 dentry = ERR_PTR(-ENOTDIR);
838 /* skip separators */
845 while (*s && *s != sep)
848 child = lookup_positive_unlocked(p, dentry, s - p);
851 } while (!IS_ERR(dentry));
856 static int cifs_set_super(struct super_block *sb, void *data)
858 struct cifs_mnt_data *mnt_data = data;
859 sb->s_fs_info = mnt_data->cifs_sb;
860 return set_anon_super(sb, NULL);
864 cifs_smb3_do_mount(struct file_system_type *fs_type,
865 int flags, struct smb3_fs_context *old_ctx)
868 struct super_block *sb = NULL;
869 struct cifs_sb_info *cifs_sb = NULL;
870 struct cifs_mnt_data mnt_data;
874 * Prints in Kernel / CIFS log the attempted mount operation
875 * If CIFS_DEBUG && cifs_FYI
878 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
880 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
882 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
883 if (cifs_sb == NULL) {
884 root = ERR_PTR(-ENOMEM);
888 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
890 root = ERR_PTR(-ENOMEM);
893 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
899 rc = cifs_setup_cifs_sb(cifs_sb);
905 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
907 if (!(flags & SB_SILENT))
908 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
914 mnt_data.ctx = cifs_sb->ctx;
915 mnt_data.cifs_sb = cifs_sb;
916 mnt_data.flags = flags;
918 /* BB should we make this contingent on mount parm? */
919 flags |= SB_NODIRATIME | SB_NOATIME;
921 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
924 cifs_umount(cifs_sb);
930 cifs_dbg(FYI, "Use existing superblock\n");
931 cifs_umount(cifs_sb);
934 rc = cifs_read_super(sb);
940 sb->s_flags |= SB_ACTIVE;
943 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
948 cifs_sb->root = dget(root);
950 cifs_dbg(FYI, "dentry root is: %p\n", root);
954 deactivate_locked_super(sb);
958 if (!sb || IS_ERR(sb)) { /* otherwise kill_sb will handle */
959 kfree(cifs_sb->prepath);
960 smb3_cleanup_fs_context(cifs_sb->ctx);
969 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
972 struct inode *inode = file_inode(iocb->ki_filp);
974 if (iocb->ki_flags & IOCB_DIRECT)
975 return cifs_user_readv(iocb, iter);
977 rc = cifs_revalidate_mapping(inode);
981 return generic_file_read_iter(iocb, iter);
984 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
986 struct inode *inode = file_inode(iocb->ki_filp);
987 struct cifsInodeInfo *cinode = CIFS_I(inode);
991 if (iocb->ki_filp->f_flags & O_DIRECT) {
992 written = cifs_user_writev(iocb, from);
993 if (written > 0 && CIFS_CACHE_READ(cinode)) {
994 cifs_zap_mapping(inode);
996 "Set no oplock for inode=%p after a write operation\n",
1003 written = cifs_get_writer(cinode);
1007 written = generic_file_write_iter(iocb, from);
1009 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
1012 rc = filemap_fdatawrite(inode->i_mapping);
1014 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1018 cifs_put_writer(cinode);
1022 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1024 struct cifsFileInfo *cfile = file->private_data;
1025 struct cifs_tcon *tcon;
1028 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1029 * the cached file length
1031 if (whence != SEEK_SET && whence != SEEK_CUR) {
1033 struct inode *inode = file_inode(file);
1036 * We need to be sure that all dirty pages are written and the
1037 * server has the newest file length.
1039 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1040 inode->i_mapping->nrpages != 0) {
1041 rc = filemap_fdatawait(inode->i_mapping);
1043 mapping_set_error(inode->i_mapping, rc);
1048 * Some applications poll for the file length in this strange
1049 * way so we must seek to end on non-oplocked files by
1050 * setting the revalidate time to zero.
1052 CIFS_I(inode)->time = 0;
1054 rc = cifs_revalidate_file_attr(file);
1058 if (cfile && cfile->tlink) {
1059 tcon = tlink_tcon(cfile->tlink);
1060 if (tcon->ses->server->ops->llseek)
1061 return tcon->ses->server->ops->llseek(file, tcon,
1064 return generic_file_llseek(file, offset, whence);
1068 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1071 * Note that this is called by vfs setlease with i_lock held to
1072 * protect *lease from going away.
1074 struct inode *inode = file_inode(file);
1075 struct cifsFileInfo *cfile = file->private_data;
1077 if (!(S_ISREG(inode->i_mode)))
1080 /* Check if file is oplocked if this is request for new lease */
1081 if (arg == F_UNLCK ||
1082 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1083 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1084 return generic_setlease(file, arg, lease, priv);
1085 else if (tlink_tcon(cfile->tlink)->local_lease &&
1086 !CIFS_CACHE_READ(CIFS_I(inode)))
1088 * If the server claims to support oplock on this file, then we
1089 * still need to check oplock even if the local_lease mount
1090 * option is set, but there are servers which do not support
1091 * oplock for which this mount option may be useful if the user
1092 * knows that the file won't be changed on the server by anyone
1095 return generic_setlease(file, arg, lease, priv);
1100 struct file_system_type cifs_fs_type = {
1101 .owner = THIS_MODULE,
1103 .init_fs_context = smb3_init_fs_context,
1104 .parameters = smb3_fs_parameters,
1105 .kill_sb = cifs_kill_sb,
1106 .fs_flags = FS_RENAME_DOES_D_MOVE,
1108 MODULE_ALIAS_FS("cifs");
1110 struct file_system_type smb3_fs_type = {
1111 .owner = THIS_MODULE,
1113 .init_fs_context = smb3_init_fs_context,
1114 .parameters = smb3_fs_parameters,
1115 .kill_sb = cifs_kill_sb,
1116 .fs_flags = FS_RENAME_DOES_D_MOVE,
1118 MODULE_ALIAS_FS("smb3");
1119 MODULE_ALIAS("smb3");
1121 const struct inode_operations cifs_dir_inode_ops = {
1122 .create = cifs_create,
1123 .atomic_open = cifs_atomic_open,
1124 .lookup = cifs_lookup,
1125 .getattr = cifs_getattr,
1126 .unlink = cifs_unlink,
1127 .link = cifs_hardlink,
1128 .mkdir = cifs_mkdir,
1129 .rmdir = cifs_rmdir,
1130 .rename = cifs_rename2,
1131 .permission = cifs_permission,
1132 .setattr = cifs_setattr,
1133 .symlink = cifs_symlink,
1134 .mknod = cifs_mknod,
1135 .listxattr = cifs_listxattr,
1136 .get_acl = cifs_get_acl,
1137 .set_acl = cifs_set_acl,
1140 const struct inode_operations cifs_file_inode_ops = {
1141 .setattr = cifs_setattr,
1142 .getattr = cifs_getattr,
1143 .permission = cifs_permission,
1144 .listxattr = cifs_listxattr,
1145 .fiemap = cifs_fiemap,
1146 .get_acl = cifs_get_acl,
1147 .set_acl = cifs_set_acl,
1150 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1151 struct delayed_call *done)
1155 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1157 return ERR_PTR(-ENOMEM);
1159 spin_lock(&inode->i_lock);
1160 if (likely(CIFS_I(inode)->symlink_target)) {
1161 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1164 target_path = ERR_PTR(-EOPNOTSUPP);
1166 spin_unlock(&inode->i_lock);
1168 if (!IS_ERR(target_path))
1169 set_delayed_call(done, kfree_link, target_path);
1174 const struct inode_operations cifs_symlink_inode_ops = {
1175 .get_link = cifs_get_link,
1176 .permission = cifs_permission,
1177 .listxattr = cifs_listxattr,
1180 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1181 struct file *dst_file, loff_t destoff, loff_t len,
1182 unsigned int remap_flags)
1184 struct inode *src_inode = file_inode(src_file);
1185 struct inode *target_inode = file_inode(dst_file);
1186 struct cifsFileInfo *smb_file_src = src_file->private_data;
1187 struct cifsFileInfo *smb_file_target;
1188 struct cifs_tcon *target_tcon;
1192 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1195 cifs_dbg(FYI, "clone range\n");
1199 if (!src_file->private_data || !dst_file->private_data) {
1201 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1205 smb_file_target = dst_file->private_data;
1206 target_tcon = tlink_tcon(smb_file_target->tlink);
1209 * Note: cifs case is easier than btrfs since server responsible for
1210 * checks for proper open modes and file type and if it wants
1211 * server could even support copy of range where source = target
1213 lock_two_nondirectories(target_inode, src_inode);
1216 len = src_inode->i_size - off;
1218 cifs_dbg(FYI, "about to flush pages\n");
1219 /* should we flush first and last page first */
1220 truncate_inode_pages_range(&target_inode->i_data, destoff,
1221 PAGE_ALIGN(destoff + len)-1);
1223 if (target_tcon->ses->server->ops->duplicate_extents)
1224 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1225 smb_file_src, smb_file_target, off, len, destoff);
1229 /* force revalidate of size and timestamps of target file now
1230 that target is updated on the server */
1231 CIFS_I(target_inode)->time = 0;
1232 /* although unlocking in the reverse order from locking is not
1233 strictly necessary here it is a little cleaner to be consistent */
1234 unlock_two_nondirectories(src_inode, target_inode);
1237 return rc < 0 ? rc : len;
1240 ssize_t cifs_file_copychunk_range(unsigned int xid,
1241 struct file *src_file, loff_t off,
1242 struct file *dst_file, loff_t destoff,
1243 size_t len, unsigned int flags)
1245 struct inode *src_inode = file_inode(src_file);
1246 struct inode *target_inode = file_inode(dst_file);
1247 struct cifsFileInfo *smb_file_src;
1248 struct cifsFileInfo *smb_file_target;
1249 struct cifs_tcon *src_tcon;
1250 struct cifs_tcon *target_tcon;
1253 cifs_dbg(FYI, "copychunk range\n");
1255 if (!src_file->private_data || !dst_file->private_data) {
1257 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1262 smb_file_target = dst_file->private_data;
1263 smb_file_src = src_file->private_data;
1264 src_tcon = tlink_tcon(smb_file_src->tlink);
1265 target_tcon = tlink_tcon(smb_file_target->tlink);
1267 if (src_tcon->ses != target_tcon->ses) {
1268 cifs_dbg(VFS, "source and target of copy not on same server\n");
1273 if (!target_tcon->ses->server->ops->copychunk_range)
1277 * Note: cifs case is easier than btrfs since server responsible for
1278 * checks for proper open modes and file type and if it wants
1279 * server could even support copy of range where source = target
1281 lock_two_nondirectories(target_inode, src_inode);
1283 cifs_dbg(FYI, "about to flush pages\n");
1285 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1290 /* should we flush first and last page first */
1291 truncate_inode_pages(&target_inode->i_data, 0);
1293 rc = file_modified(dst_file);
1295 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1296 smb_file_src, smb_file_target, off, len, destoff);
1298 file_accessed(src_file);
1300 /* force revalidate of size and timestamps of target file now
1301 * that target is updated on the server
1303 CIFS_I(target_inode)->time = 0;
1306 /* although unlocking in the reverse order from locking is not
1307 * strictly necessary here it is a little cleaner to be consistent
1309 unlock_two_nondirectories(src_inode, target_inode);
1316 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1317 * is a dummy operation.
1319 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1321 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1327 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1328 struct file *dst_file, loff_t destoff,
1329 size_t len, unsigned int flags)
1331 unsigned int xid = get_xid();
1333 struct cifsFileInfo *cfile = dst_file->private_data;
1335 if (cfile->swapfile) {
1341 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1345 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1346 rc = generic_copy_file_range(src_file, off, dst_file,
1347 destoff, len, flags);
1351 const struct file_operations cifs_file_ops = {
1352 .read_iter = cifs_loose_read_iter,
1353 .write_iter = cifs_file_write_iter,
1355 .release = cifs_close,
1357 .flock = cifs_flock,
1358 .fsync = cifs_fsync,
1359 .flush = cifs_flush,
1360 .mmap = cifs_file_mmap,
1361 .splice_read = cifs_splice_read,
1362 .splice_write = iter_file_splice_write,
1363 .llseek = cifs_llseek,
1364 .unlocked_ioctl = cifs_ioctl,
1365 .copy_file_range = cifs_copy_file_range,
1366 .remap_file_range = cifs_remap_file_range,
1367 .setlease = cifs_setlease,
1368 .fallocate = cifs_fallocate,
1371 const struct file_operations cifs_file_strict_ops = {
1372 .read_iter = cifs_strict_readv,
1373 .write_iter = cifs_strict_writev,
1375 .release = cifs_close,
1377 .flock = cifs_flock,
1378 .fsync = cifs_strict_fsync,
1379 .flush = cifs_flush,
1380 .mmap = cifs_file_strict_mmap,
1381 .splice_read = cifs_splice_read,
1382 .splice_write = iter_file_splice_write,
1383 .llseek = cifs_llseek,
1384 .unlocked_ioctl = cifs_ioctl,
1385 .copy_file_range = cifs_copy_file_range,
1386 .remap_file_range = cifs_remap_file_range,
1387 .setlease = cifs_setlease,
1388 .fallocate = cifs_fallocate,
1391 const struct file_operations cifs_file_direct_ops = {
1392 .read_iter = cifs_direct_readv,
1393 .write_iter = cifs_direct_writev,
1395 .release = cifs_close,
1397 .flock = cifs_flock,
1398 .fsync = cifs_fsync,
1399 .flush = cifs_flush,
1400 .mmap = cifs_file_mmap,
1401 .splice_read = direct_splice_read,
1402 .splice_write = iter_file_splice_write,
1403 .unlocked_ioctl = cifs_ioctl,
1404 .copy_file_range = cifs_copy_file_range,
1405 .remap_file_range = cifs_remap_file_range,
1406 .llseek = cifs_llseek,
1407 .setlease = cifs_setlease,
1408 .fallocate = cifs_fallocate,
1411 const struct file_operations cifs_file_nobrl_ops = {
1412 .read_iter = cifs_loose_read_iter,
1413 .write_iter = cifs_file_write_iter,
1415 .release = cifs_close,
1416 .fsync = cifs_fsync,
1417 .flush = cifs_flush,
1418 .mmap = cifs_file_mmap,
1419 .splice_read = cifs_splice_read,
1420 .splice_write = iter_file_splice_write,
1421 .llseek = cifs_llseek,
1422 .unlocked_ioctl = cifs_ioctl,
1423 .copy_file_range = cifs_copy_file_range,
1424 .remap_file_range = cifs_remap_file_range,
1425 .setlease = cifs_setlease,
1426 .fallocate = cifs_fallocate,
1429 const struct file_operations cifs_file_strict_nobrl_ops = {
1430 .read_iter = cifs_strict_readv,
1431 .write_iter = cifs_strict_writev,
1433 .release = cifs_close,
1434 .fsync = cifs_strict_fsync,
1435 .flush = cifs_flush,
1436 .mmap = cifs_file_strict_mmap,
1437 .splice_read = cifs_splice_read,
1438 .splice_write = iter_file_splice_write,
1439 .llseek = cifs_llseek,
1440 .unlocked_ioctl = cifs_ioctl,
1441 .copy_file_range = cifs_copy_file_range,
1442 .remap_file_range = cifs_remap_file_range,
1443 .setlease = cifs_setlease,
1444 .fallocate = cifs_fallocate,
1447 const struct file_operations cifs_file_direct_nobrl_ops = {
1448 .read_iter = cifs_direct_readv,
1449 .write_iter = cifs_direct_writev,
1451 .release = cifs_close,
1452 .fsync = cifs_fsync,
1453 .flush = cifs_flush,
1454 .mmap = cifs_file_mmap,
1455 .splice_read = direct_splice_read,
1456 .splice_write = iter_file_splice_write,
1457 .unlocked_ioctl = cifs_ioctl,
1458 .copy_file_range = cifs_copy_file_range,
1459 .remap_file_range = cifs_remap_file_range,
1460 .llseek = cifs_llseek,
1461 .setlease = cifs_setlease,
1462 .fallocate = cifs_fallocate,
1465 const struct file_operations cifs_dir_ops = {
1466 .iterate_shared = cifs_readdir,
1467 .release = cifs_closedir,
1468 .read = generic_read_dir,
1469 .unlocked_ioctl = cifs_ioctl,
1470 .copy_file_range = cifs_copy_file_range,
1471 .remap_file_range = cifs_remap_file_range,
1472 .llseek = generic_file_llseek,
1473 .fsync = cifs_dir_fsync,
1477 cifs_init_once(void *inode)
1479 struct cifsInodeInfo *cifsi = inode;
1481 inode_init_once(&cifsi->netfs.inode);
1482 init_rwsem(&cifsi->lock_sem);
1486 cifs_init_inodecache(void)
1488 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1489 sizeof(struct cifsInodeInfo),
1490 0, (SLAB_RECLAIM_ACCOUNT|
1491 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1493 if (cifs_inode_cachep == NULL)
1500 cifs_destroy_inodecache(void)
1503 * Make sure all delayed rcu free inodes are flushed before we
1507 kmem_cache_destroy(cifs_inode_cachep);
1511 cifs_init_request_bufs(void)
1514 * SMB2 maximum header size is bigger than CIFS one - no problems to
1515 * allocate some more bytes for CIFS.
1517 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1519 if (CIFSMaxBufSize < 8192) {
1520 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1521 Unicode path name has to fit in any SMB/CIFS path based frames */
1522 CIFSMaxBufSize = 8192;
1523 } else if (CIFSMaxBufSize > 1024*127) {
1524 CIFSMaxBufSize = 1024 * 127;
1526 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1529 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1530 CIFSMaxBufSize, CIFSMaxBufSize);
1532 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1533 CIFSMaxBufSize + max_hdr_size, 0,
1534 SLAB_HWCACHE_ALIGN, 0,
1535 CIFSMaxBufSize + max_hdr_size,
1537 if (cifs_req_cachep == NULL)
1540 if (cifs_min_rcv < 1)
1542 else if (cifs_min_rcv > 64) {
1544 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1547 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1550 if (cifs_req_poolp == NULL) {
1551 kmem_cache_destroy(cifs_req_cachep);
1554 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1555 almost all handle based requests (but not write response, nor is it
1556 sufficient for path based requests). A smaller size would have
1557 been more efficient (compacting multiple slab items on one 4k page)
1558 for the case in which debug was on, but this larger size allows
1559 more SMBs to use small buffer alloc and is still much more
1560 efficient to alloc 1 per page off the slab compared to 17K (5page)
1561 alloc of large cifs buffers even when page debugging is on */
1562 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1563 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1564 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1565 if (cifs_sm_req_cachep == NULL) {
1566 mempool_destroy(cifs_req_poolp);
1567 kmem_cache_destroy(cifs_req_cachep);
1571 if (cifs_min_small < 2)
1573 else if (cifs_min_small > 256) {
1574 cifs_min_small = 256;
1575 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1578 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1579 cifs_sm_req_cachep);
1581 if (cifs_sm_req_poolp == NULL) {
1582 mempool_destroy(cifs_req_poolp);
1583 kmem_cache_destroy(cifs_req_cachep);
1584 kmem_cache_destroy(cifs_sm_req_cachep);
1592 cifs_destroy_request_bufs(void)
1594 mempool_destroy(cifs_req_poolp);
1595 kmem_cache_destroy(cifs_req_cachep);
1596 mempool_destroy(cifs_sm_req_poolp);
1597 kmem_cache_destroy(cifs_sm_req_cachep);
1600 static int init_mids(void)
1602 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1603 sizeof(struct mid_q_entry), 0,
1604 SLAB_HWCACHE_ALIGN, NULL);
1605 if (cifs_mid_cachep == NULL)
1608 /* 3 is a reasonable minimum number of simultaneous operations */
1609 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1610 if (cifs_mid_poolp == NULL) {
1611 kmem_cache_destroy(cifs_mid_cachep);
1618 static void destroy_mids(void)
1620 mempool_destroy(cifs_mid_poolp);
1621 kmem_cache_destroy(cifs_mid_cachep);
1629 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1631 * Initialize Global counters
1633 atomic_set(&sesInfoAllocCount, 0);
1634 atomic_set(&tconInfoAllocCount, 0);
1635 atomic_set(&tcpSesNextId, 0);
1636 atomic_set(&tcpSesAllocCount, 0);
1637 atomic_set(&tcpSesReconnectCount, 0);
1638 atomic_set(&tconInfoReconnectCount, 0);
1640 atomic_set(&buf_alloc_count, 0);
1641 atomic_set(&small_buf_alloc_count, 0);
1642 #ifdef CONFIG_CIFS_STATS2
1643 atomic_set(&total_buf_alloc_count, 0);
1644 atomic_set(&total_small_buf_alloc_count, 0);
1645 if (slow_rsp_threshold < 1)
1646 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1647 else if (slow_rsp_threshold > 32767)
1649 "slow response threshold set higher than recommended (0 to 32767)\n");
1650 #endif /* CONFIG_CIFS_STATS2 */
1652 atomic_set(&mid_count, 0);
1653 GlobalCurrentXid = 0;
1654 GlobalTotalActiveXid = 0;
1655 GlobalMaxActiveXid = 0;
1656 spin_lock_init(&cifs_tcp_ses_lock);
1657 spin_lock_init(&GlobalMid_Lock);
1659 cifs_lock_secret = get_random_u32();
1661 if (cifs_max_pending < 2) {
1662 cifs_max_pending = 2;
1663 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1664 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1665 cifs_max_pending = CIFS_MAX_REQ;
1666 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1670 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1673 goto out_clean_proc;
1677 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1678 * so that we don't launch too many worker threads but
1679 * Documentation/core-api/workqueue.rst recommends setting it to 0
1682 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1683 decrypt_wq = alloc_workqueue("smb3decryptd",
1684 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1687 goto out_destroy_cifsiod_wq;
1690 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1691 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1692 if (!fileinfo_put_wq) {
1694 goto out_destroy_decrypt_wq;
1697 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1698 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1699 if (!cifsoplockd_wq) {
1701 goto out_destroy_fileinfo_put_wq;
1704 deferredclose_wq = alloc_workqueue("deferredclose",
1705 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1706 if (!deferredclose_wq) {
1708 goto out_destroy_cifsoplockd_wq;
1711 rc = cifs_init_inodecache();
1713 goto out_destroy_deferredclose_wq;
1717 goto out_destroy_inodecache;
1719 rc = cifs_init_request_bufs();
1721 goto out_destroy_mids;
1723 #ifdef CONFIG_CIFS_DFS_UPCALL
1724 rc = dfs_cache_init();
1726 goto out_destroy_request_bufs;
1727 #endif /* CONFIG_CIFS_DFS_UPCALL */
1728 #ifdef CONFIG_CIFS_UPCALL
1729 rc = init_cifs_spnego();
1731 goto out_destroy_dfs_cache;
1732 #endif /* CONFIG_CIFS_UPCALL */
1733 #ifdef CONFIG_CIFS_SWN_UPCALL
1734 rc = cifs_genl_init();
1736 goto out_register_key_type;
1737 #endif /* CONFIG_CIFS_SWN_UPCALL */
1739 rc = init_cifs_idmap();
1741 goto out_cifs_swn_init;
1743 rc = register_filesystem(&cifs_fs_type);
1745 goto out_init_cifs_idmap;
1747 rc = register_filesystem(&smb3_fs_type);
1749 unregister_filesystem(&cifs_fs_type);
1750 goto out_init_cifs_idmap;
1755 out_init_cifs_idmap:
1758 #ifdef CONFIG_CIFS_SWN_UPCALL
1760 out_register_key_type:
1762 #ifdef CONFIG_CIFS_UPCALL
1764 out_destroy_dfs_cache:
1766 #ifdef CONFIG_CIFS_DFS_UPCALL
1767 dfs_cache_destroy();
1768 out_destroy_request_bufs:
1770 cifs_destroy_request_bufs();
1773 out_destroy_inodecache:
1774 cifs_destroy_inodecache();
1775 out_destroy_deferredclose_wq:
1776 destroy_workqueue(deferredclose_wq);
1777 out_destroy_cifsoplockd_wq:
1778 destroy_workqueue(cifsoplockd_wq);
1779 out_destroy_fileinfo_put_wq:
1780 destroy_workqueue(fileinfo_put_wq);
1781 out_destroy_decrypt_wq:
1782 destroy_workqueue(decrypt_wq);
1783 out_destroy_cifsiod_wq:
1784 destroy_workqueue(cifsiod_wq);
1793 cifs_dbg(NOISY, "exit_smb3\n");
1794 unregister_filesystem(&cifs_fs_type);
1795 unregister_filesystem(&smb3_fs_type);
1796 cifs_dfs_release_automount_timer();
1798 #ifdef CONFIG_CIFS_SWN_UPCALL
1801 #ifdef CONFIG_CIFS_UPCALL
1804 #ifdef CONFIG_CIFS_DFS_UPCALL
1805 dfs_cache_destroy();
1807 cifs_destroy_request_bufs();
1809 cifs_destroy_inodecache();
1810 destroy_workqueue(deferredclose_wq);
1811 destroy_workqueue(cifsoplockd_wq);
1812 destroy_workqueue(decrypt_wq);
1813 destroy_workqueue(fileinfo_put_wq);
1814 destroy_workqueue(cifsiod_wq);
1818 MODULE_AUTHOR("Steve French");
1819 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1821 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1822 "also older servers complying with the SNIA CIFS Specification)");
1823 MODULE_VERSION(CIFS_VERSION);
1824 MODULE_SOFTDEP("ecb");
1825 MODULE_SOFTDEP("hmac");
1826 MODULE_SOFTDEP("md5");
1827 MODULE_SOFTDEP("nls");
1828 MODULE_SOFTDEP("aes");
1829 MODULE_SOFTDEP("cmac");
1830 MODULE_SOFTDEP("sha256");
1831 MODULE_SOFTDEP("sha512");
1832 MODULE_SOFTDEP("aead2");
1833 MODULE_SOFTDEP("ccm");
1834 MODULE_SOFTDEP("gcm");
1835 module_init(init_cifs)
1836 module_exit(exit_cifs)