1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2008
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/filelock.h>
16 #include <linux/mount.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/list.h>
20 #include <linux/seq_file.h>
21 #include <linux/vfs.h>
22 #include <linux/mempool.h>
23 #include <linux/delay.h>
24 #include <linux/kthread.h>
25 #include <linux/freezer.h>
26 #include <linux/namei.h>
27 #include <linux/random.h>
28 #include <linux/splice.h>
29 #include <linux/uuid.h>
30 #include <linux/xattr.h>
31 #include <uapi/linux/magic.h>
35 #define DECLARE_GLOBALS_HERE
37 #include "cifsproto.h"
38 #include "cifs_debug.h"
39 #include "cifs_fs_sb.h"
41 #include <linux/key-type.h>
42 #include "cifs_spnego.h"
44 #ifdef CONFIG_CIFS_DFS_UPCALL
45 #include "dfs_cache.h"
47 #ifdef CONFIG_CIFS_SWN_UPCALL
50 #include "fs_context.h"
51 #include "cached_dir.h"
54 * DOS dates from 1980/1/1 through 2107/12/31
55 * Protocol specifications indicate the range should be to 119, which
56 * limits maximum year to 2099. But this range has not been checked.
58 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
59 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
60 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
64 bool enable_oplocks = true;
65 bool linuxExtEnabled = true;
66 bool lookupCacheEnabled = true;
67 bool disable_legacy_dialects; /* false by default */
68 bool enable_gcm_256 = true;
69 bool require_gcm_256; /* false by default */
70 bool enable_negotiate_signing; /* false by default */
71 unsigned int global_secflags = CIFSSEC_DEF;
72 /* unsigned int ntlmv2_support = 0; */
73 unsigned int sign_CIFS_PDUs = 1;
76 * Global transaction id (XID) information
78 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */
79 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */
80 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */
81 spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
84 * Global counters, updated atomically
86 atomic_t sesInfoAllocCount;
87 atomic_t tconInfoAllocCount;
88 atomic_t tcpSesNextId;
89 atomic_t tcpSesAllocCount;
90 atomic_t tcpSesReconnectCount;
91 atomic_t tconInfoReconnectCount;
94 atomic_t buf_alloc_count;
95 atomic_t small_buf_alloc_count;
96 #ifdef CONFIG_CIFS_STATS2
97 atomic_t total_buf_alloc_count;
98 atomic_t total_small_buf_alloc_count;
100 struct list_head cifs_tcp_ses_list;
101 spinlock_t cifs_tcp_ses_lock;
102 static const struct super_operations cifs_super_ops;
103 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
104 module_param(CIFSMaxBufSize, uint, 0444);
105 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
106 "for CIFS requests. "
107 "Default: 16384 Range: 8192 to 130048");
108 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
109 module_param(cifs_min_rcv, uint, 0444);
110 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
112 unsigned int cifs_min_small = 30;
113 module_param(cifs_min_small, uint, 0444);
114 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
116 unsigned int cifs_max_pending = CIFS_MAX_REQ;
117 module_param(cifs_max_pending, uint, 0444);
118 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
119 "CIFS/SMB1 dialect (N/A for SMB3) "
120 "Default: 32767 Range: 2 to 32767.");
121 unsigned int dir_cache_timeout = 30;
122 module_param(dir_cache_timeout, uint, 0644);
123 MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 "
124 "Range: 1 to 65000 seconds, 0 to disable caching dir contents");
125 #ifdef CONFIG_CIFS_STATS2
126 unsigned int slow_rsp_threshold = 1;
127 module_param(slow_rsp_threshold, uint, 0644);
128 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
129 "before logging that a response is delayed. "
130 "Default: 1 (if set to 0 disables msg).");
133 module_param(enable_oplocks, bool, 0644);
134 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
136 module_param(enable_gcm_256, bool, 0644);
137 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: y/Y/0");
139 module_param(require_gcm_256, bool, 0644);
140 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
142 module_param(enable_negotiate_signing, bool, 0644);
143 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
145 module_param(disable_legacy_dialects, bool, 0644);
146 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
147 "helpful to restrict the ability to "
148 "override the default dialects (SMB2.1, "
149 "SMB3 and SMB3.02) on mount with old "
150 "dialects (CIFS/SMB1 and SMB2) since "
151 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
152 " and less secure. Default: n/N/0");
154 struct workqueue_struct *cifsiod_wq;
155 struct workqueue_struct *decrypt_wq;
156 struct workqueue_struct *fileinfo_put_wq;
157 struct workqueue_struct *cifsoplockd_wq;
158 struct workqueue_struct *deferredclose_wq;
159 struct workqueue_struct *serverclose_wq;
160 struct workqueue_struct *cfid_put_wq;
161 __u32 cifs_lock_secret;
164 * Bumps refcount for cifs super block.
165 * Note that it should be only called if a reference to VFS super block is
166 * already held, e.g. in open-type syscalls context. Otherwise it can race with
167 * atomic_dec_and_test in deactivate_locked_super.
170 cifs_sb_active(struct super_block *sb)
172 struct cifs_sb_info *server = CIFS_SB(sb);
174 if (atomic_inc_return(&server->active) == 1)
175 atomic_inc(&sb->s_active);
179 cifs_sb_deactive(struct super_block *sb)
181 struct cifs_sb_info *server = CIFS_SB(sb);
183 if (atomic_dec_and_test(&server->active))
184 deactivate_super(sb);
188 cifs_read_super(struct super_block *sb)
191 struct cifs_sb_info *cifs_sb;
192 struct cifs_tcon *tcon;
193 struct timespec64 ts;
196 cifs_sb = CIFS_SB(sb);
197 tcon = cifs_sb_master_tcon(cifs_sb);
199 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
200 sb->s_flags |= SB_POSIXACL;
202 if (tcon->snapshot_time)
203 sb->s_flags |= SB_RDONLY;
205 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
206 sb->s_maxbytes = MAX_LFS_FILESIZE;
208 sb->s_maxbytes = MAX_NON_LFS;
211 * Some very old servers like DOS and OS/2 used 2 second granularity
212 * (while all current servers use 100ns granularity - see MS-DTYP)
213 * but 1 second is the maximum allowed granularity for the VFS
214 * so for old servers set time granularity to 1 second while for
215 * everything else (current servers) set it to 100ns.
217 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
218 ((tcon->ses->capabilities &
219 tcon->ses->server->vals->cap_nt_find) == 0) &&
221 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
222 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
223 sb->s_time_min = ts.tv_sec;
224 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
225 cpu_to_le16(SMB_TIME_MAX), 0);
226 sb->s_time_max = ts.tv_sec;
229 * Almost every server, including all SMB2+, uses DCE TIME
230 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
232 sb->s_time_gran = 100;
233 ts = cifs_NTtimeToUnix(0);
234 sb->s_time_min = ts.tv_sec;
235 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
236 sb->s_time_max = ts.tv_sec;
239 sb->s_magic = CIFS_SUPER_MAGIC;
240 sb->s_op = &cifs_super_ops;
241 sb->s_xattr = cifs_xattr_handlers;
242 rc = super_setup_bdi(sb);
245 /* tune readahead according to rsize if readahead size not set on mount */
246 if (cifs_sb->ctx->rsize == 0)
247 cifs_sb->ctx->rsize =
248 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
249 if (cifs_sb->ctx->rasize)
250 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
252 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
254 sb->s_blocksize = CIFS_MAX_MSGSIZE;
255 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
256 inode = cifs_root_iget(sb);
264 sb->s_d_op = &cifs_ci_dentry_ops;
266 sb->s_d_op = &cifs_dentry_ops;
268 sb->s_root = d_make_root(inode);
274 #ifdef CONFIG_CIFS_NFSD_EXPORT
275 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
276 cifs_dbg(FYI, "export ops supported\n");
277 sb->s_export_op = &cifs_export_ops;
279 #endif /* CONFIG_CIFS_NFSD_EXPORT */
284 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
288 static void cifs_kill_sb(struct super_block *sb)
290 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
293 * We need to release all dentries for the cached directories
294 * before we kill the sb.
297 close_all_cached_dirs(cifs_sb);
299 /* finally release root dentry */
301 cifs_sb->root = NULL;
305 cifs_umount(cifs_sb);
309 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
311 struct super_block *sb = dentry->d_sb;
312 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
313 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
314 struct TCP_Server_Info *server = tcon->ses->server;
317 const char *full_path;
321 page = alloc_dentry_path();
323 full_path = build_path_from_dentry(dentry, page);
324 if (IS_ERR(full_path)) {
325 rc = PTR_ERR(full_path);
329 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
331 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
333 buf->f_namelen = PATH_MAX;
335 buf->f_fsid.val[0] = tcon->vol_serial_number;
336 /* are using part of create time for more randomness, see man statfs */
337 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
339 buf->f_files = 0; /* undefined */
340 buf->f_ffree = 0; /* unlimited */
342 if (server->ops->queryfs)
343 rc = server->ops->queryfs(xid, tcon, full_path, cifs_sb, buf);
346 free_dentry_path(page);
351 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
353 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
354 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
355 struct TCP_Server_Info *server = tcon->ses->server;
357 if (server->ops->fallocate)
358 return server->ops->fallocate(file, tcon, mode, off, len);
363 static int cifs_permission(struct mnt_idmap *idmap,
364 struct inode *inode, int mask)
366 struct cifs_sb_info *cifs_sb;
368 cifs_sb = CIFS_SB(inode->i_sb);
370 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
371 if ((mask & MAY_EXEC) && !execute_ok(inode))
375 } else /* file mode might have been restricted at mount time
376 on the client (above and beyond ACL on servers) for
377 servers which do not support setting and viewing mode bits,
378 so allowing client to check permissions is useful */
379 return generic_permission(&nop_mnt_idmap, inode, mask);
382 static struct kmem_cache *cifs_inode_cachep;
383 static struct kmem_cache *cifs_req_cachep;
384 static struct kmem_cache *cifs_mid_cachep;
385 static struct kmem_cache *cifs_sm_req_cachep;
386 static struct kmem_cache *cifs_io_request_cachep;
387 static struct kmem_cache *cifs_io_subrequest_cachep;
388 mempool_t *cifs_sm_req_poolp;
389 mempool_t *cifs_req_poolp;
390 mempool_t *cifs_mid_poolp;
391 mempool_t cifs_io_request_pool;
392 mempool_t cifs_io_subrequest_pool;
394 static struct inode *
395 cifs_alloc_inode(struct super_block *sb)
397 struct cifsInodeInfo *cifs_inode;
398 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
401 cifs_inode->cifsAttrs = ATTR_ARCHIVE; /* default */
402 cifs_inode->time = 0;
404 * Until the file is open and we have gotten oplock info back from the
405 * server, can not assume caching of file data or metadata.
407 cifs_set_oplock_level(cifs_inode, 0);
408 cifs_inode->lease_granted = false;
409 cifs_inode->flags = 0;
410 spin_lock_init(&cifs_inode->writers_lock);
411 cifs_inode->writers = 0;
412 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
413 cifs_inode->netfs.remote_i_size = 0;
414 cifs_inode->uniqueid = 0;
415 cifs_inode->createtime = 0;
416 cifs_inode->epoch = 0;
417 spin_lock_init(&cifs_inode->open_file_lock);
418 generate_random_uuid(cifs_inode->lease_key);
419 cifs_inode->symlink_target = NULL;
422 * Can not set i_flags here - they get immediately overwritten to zero
425 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
426 INIT_LIST_HEAD(&cifs_inode->openFileList);
427 INIT_LIST_HEAD(&cifs_inode->llist);
428 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
429 spin_lock_init(&cifs_inode->deferred_lock);
430 return &cifs_inode->netfs.inode;
434 cifs_free_inode(struct inode *inode)
436 struct cifsInodeInfo *cinode = CIFS_I(inode);
438 if (S_ISLNK(inode->i_mode))
439 kfree(cinode->symlink_target);
440 kmem_cache_free(cifs_inode_cachep, cinode);
444 cifs_evict_inode(struct inode *inode)
446 netfs_wait_for_outstanding_io(inode);
447 truncate_inode_pages_final(&inode->i_data);
448 if (inode->i_state & I_PINNING_NETFS_WB)
449 cifs_fscache_unuse_inode_cookie(inode, true);
450 cifs_fscache_release_inode_cookie(inode);
455 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
457 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
458 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
460 seq_puts(s, ",addr=");
462 switch (server->dstaddr.ss_family) {
464 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
467 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
468 if (sa6->sin6_scope_id)
469 seq_printf(s, "%%%u", sa6->sin6_scope_id);
472 seq_puts(s, "(unknown)");
475 seq_puts(s, ",rdma");
479 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
481 if (ses->sectype == Unspecified) {
482 if (ses->user_name == NULL)
483 seq_puts(s, ",sec=none");
487 seq_puts(s, ",sec=");
489 switch (ses->sectype) {
491 seq_puts(s, "ntlmv2");
497 seq_puts(s, "ntlmssp");
500 /* shouldn't ever happen */
501 seq_puts(s, "unknown");
508 if (ses->sectype == Kerberos)
509 seq_printf(s, ",cruid=%u",
510 from_kuid_munged(&init_user_ns, ses->cred_uid));
514 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
516 seq_puts(s, ",cache=");
518 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
519 seq_puts(s, "strict");
520 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
522 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
523 seq_puts(s, "singleclient"); /* assume only one client access */
524 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
525 seq_puts(s, "ro"); /* read only caching assumed */
527 seq_puts(s, "loose");
531 * cifs_show_devname() is used so we show the mount device name with correct
532 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
534 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
536 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
537 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
542 convert_delimiter(devname, '/');
543 /* escape all spaces in share names */
544 seq_escape(m, devname, " \t");
551 cifs_show_upcall_target(struct seq_file *s, struct cifs_sb_info *cifs_sb)
553 if (cifs_sb->ctx->upcall_target == UPTARGET_UNSPECIFIED) {
554 seq_puts(s, ",upcall_target=app");
558 seq_puts(s, ",upcall_target=");
560 switch (cifs_sb->ctx->upcall_target) {
565 seq_puts(s, "mount");
568 /* shouldn't ever happen */
569 seq_puts(s, "unknown");
575 * cifs_show_options() is for displaying mount options in /proc/mounts.
576 * Not all settable options are displayed but most of the important
580 cifs_show_options(struct seq_file *s, struct dentry *root)
582 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
583 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
584 struct sockaddr *srcaddr;
585 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
587 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
588 cifs_show_security(s, tcon->ses);
589 cifs_show_cache_flavor(s, cifs_sb);
590 cifs_show_upcall_target(s, cifs_sb);
593 seq_puts(s, ",nolease");
594 if (cifs_sb->ctx->multiuser)
595 seq_puts(s, ",multiuser");
596 else if (tcon->ses->user_name)
597 seq_show_option(s, "username", tcon->ses->user_name);
599 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
600 seq_show_option(s, "domain", tcon->ses->domainName);
602 if (srcaddr->sa_family != AF_UNSPEC) {
603 struct sockaddr_in *saddr4;
604 struct sockaddr_in6 *saddr6;
605 saddr4 = (struct sockaddr_in *)srcaddr;
606 saddr6 = (struct sockaddr_in6 *)srcaddr;
607 if (srcaddr->sa_family == AF_INET6)
608 seq_printf(s, ",srcaddr=%pI6c",
610 else if (srcaddr->sa_family == AF_INET)
611 seq_printf(s, ",srcaddr=%pI4",
612 &saddr4->sin_addr.s_addr);
614 seq_printf(s, ",srcaddr=BAD-AF:%i",
615 (int)(srcaddr->sa_family));
618 seq_printf(s, ",uid=%u",
619 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
621 seq_puts(s, ",forceuid");
623 seq_puts(s, ",noforceuid");
625 seq_printf(s, ",gid=%u",
626 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
628 seq_puts(s, ",forcegid");
630 seq_puts(s, ",noforcegid");
632 cifs_show_address(s, tcon->ses->server);
635 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
636 cifs_sb->ctx->file_mode,
637 cifs_sb->ctx->dir_mode);
638 if (cifs_sb->ctx->iocharset)
639 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
641 seq_puts(s, ",seal");
642 else if (tcon->ses->server->ignore_signature)
643 seq_puts(s, ",signloosely");
645 seq_puts(s, ",nocase");
647 seq_puts(s, ",nodelete");
648 if (cifs_sb->ctx->no_sparse)
649 seq_puts(s, ",nosparse");
650 if (tcon->local_lease)
651 seq_puts(s, ",locallease");
653 seq_puts(s, ",hard");
655 seq_puts(s, ",soft");
656 if (tcon->use_persistent)
657 seq_puts(s, ",persistenthandles");
658 else if (tcon->use_resilient)
659 seq_puts(s, ",resilienthandles");
660 if (tcon->posix_extensions)
661 seq_puts(s, ",posix");
662 else if (tcon->unix_ext)
663 seq_puts(s, ",unix");
665 seq_puts(s, ",nounix");
666 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
667 seq_puts(s, ",nodfs");
668 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
669 seq_puts(s, ",posixpaths");
670 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
671 seq_puts(s, ",setuids");
672 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
673 seq_puts(s, ",idsfromsid");
674 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
675 seq_puts(s, ",serverino");
676 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
677 seq_puts(s, ",rwpidforward");
678 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
679 seq_puts(s, ",forcemand");
680 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
681 seq_puts(s, ",nouser_xattr");
682 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
683 seq_puts(s, ",mapchars");
684 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
685 seq_puts(s, ",mapposix");
686 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
688 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
689 seq_puts(s, ",nobrl");
690 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
691 seq_puts(s, ",nohandlecache");
692 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
693 seq_puts(s, ",modefromsid");
694 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
695 seq_puts(s, ",cifsacl");
696 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
697 seq_puts(s, ",dynperm");
698 if (root->d_sb->s_flags & SB_POSIXACL)
700 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
701 seq_puts(s, ",mfsymlinks");
702 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
704 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
705 seq_puts(s, ",nostrictsync");
706 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
707 seq_puts(s, ",noperm");
708 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
709 seq_printf(s, ",backupuid=%u",
710 from_kuid_munged(&init_user_ns,
711 cifs_sb->ctx->backupuid));
712 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
713 seq_printf(s, ",backupgid=%u",
714 from_kgid_munged(&init_user_ns,
715 cifs_sb->ctx->backupgid));
716 seq_show_option(s, "reparse",
717 cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
719 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
720 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
721 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
722 if (cifs_sb->ctx->rasize)
723 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
724 if (tcon->ses->server->min_offload)
725 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
726 if (tcon->ses->server->retrans)
727 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans);
728 seq_printf(s, ",echo_interval=%lu",
729 tcon->ses->server->echo_interval / HZ);
731 /* Only display the following if overridden on mount */
732 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
733 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
734 if (tcon->ses->server->tcp_nodelay)
735 seq_puts(s, ",tcpnodelay");
736 if (tcon->ses->server->noautotune)
737 seq_puts(s, ",noautotune");
738 if (tcon->ses->server->noblocksnd)
739 seq_puts(s, ",noblocksend");
740 if (tcon->ses->server->nosharesock)
741 seq_puts(s, ",nosharesock");
743 if (tcon->snapshot_time)
744 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
745 if (tcon->handle_timeout)
746 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
747 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
748 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
751 * Display file and directory attribute timeout in seconds.
752 * If file and directory attribute timeout the same then actimeo
753 * was likely specified on mount
755 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
756 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
758 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
759 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
761 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
763 if (tcon->ses->chan_max > 1)
764 seq_printf(s, ",multichannel,max_channels=%zu",
765 tcon->ses->chan_max);
767 if (tcon->use_witness)
768 seq_puts(s, ",witness");
773 static void cifs_umount_begin(struct super_block *sb)
775 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
776 struct cifs_tcon *tcon;
781 tcon = cifs_sb_master_tcon(cifs_sb);
783 spin_lock(&cifs_tcp_ses_lock);
784 spin_lock(&tcon->tc_lock);
785 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
786 netfs_trace_tcon_ref_see_umount);
787 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
788 /* we have other mounts to same share or we have
789 already tried to umount this and woken up
790 all waiting network requests, nothing to do */
791 spin_unlock(&tcon->tc_lock);
792 spin_unlock(&cifs_tcp_ses_lock);
796 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
797 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
799 spin_unlock(&tcon->tc_lock);
800 spin_unlock(&cifs_tcp_ses_lock);
802 cifs_close_all_deferred_files(tcon);
803 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
804 /* cancel_notify_requests(tcon); */
805 if (tcon->ses && tcon->ses->server) {
806 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
807 wake_up_all(&tcon->ses->server->request_q);
808 wake_up_all(&tcon->ses->server->response_q);
809 msleep(1); /* yield */
810 /* we have to kick the requests once more */
811 wake_up_all(&tcon->ses->server->response_q);
818 static int cifs_freeze(struct super_block *sb)
820 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
821 struct cifs_tcon *tcon;
826 tcon = cifs_sb_master_tcon(cifs_sb);
828 cifs_close_all_deferred_files(tcon);
832 #ifdef CONFIG_CIFS_STATS2
833 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
840 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
842 return netfs_unpin_writeback(inode, wbc);
845 static int cifs_drop_inode(struct inode *inode)
847 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
849 /* no serverino => unconditional eviction */
850 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
851 generic_drop_inode(inode);
854 static const struct super_operations cifs_super_ops = {
855 .statfs = cifs_statfs,
856 .alloc_inode = cifs_alloc_inode,
857 .write_inode = cifs_write_inode,
858 .free_inode = cifs_free_inode,
859 .drop_inode = cifs_drop_inode,
860 .evict_inode = cifs_evict_inode,
861 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
862 .show_devname = cifs_show_devname,
863 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
864 function unless later we add lazy close of inodes or unless the
865 kernel forgets to call us with the same number of releases (closes)
867 .show_options = cifs_show_options,
868 .umount_begin = cifs_umount_begin,
869 .freeze_fs = cifs_freeze,
870 #ifdef CONFIG_CIFS_STATS2
871 .show_stats = cifs_show_stats,
876 * Get root dentry from superblock according to prefix path mount option.
877 * Return dentry with refcount + 1 on success and NULL otherwise.
879 static struct dentry *
880 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
882 struct dentry *dentry;
883 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
884 char *full_path = NULL;
888 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
889 return dget(sb->s_root);
891 full_path = cifs_build_path_to_root(ctx, cifs_sb,
892 cifs_sb_master_tcon(cifs_sb), 0);
893 if (full_path == NULL)
894 return ERR_PTR(-ENOMEM);
896 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
898 sep = CIFS_DIR_SEP(cifs_sb);
899 dentry = dget(sb->s_root);
903 struct inode *dir = d_inode(dentry);
904 struct dentry *child;
906 if (!S_ISDIR(dir->i_mode)) {
908 dentry = ERR_PTR(-ENOTDIR);
912 /* skip separators */
919 while (*s && *s != sep)
922 child = lookup_positive_unlocked(p, dentry, s - p);
925 } while (!IS_ERR(dentry));
930 static int cifs_set_super(struct super_block *sb, void *data)
932 struct cifs_mnt_data *mnt_data = data;
933 sb->s_fs_info = mnt_data->cifs_sb;
934 return set_anon_super(sb, NULL);
938 cifs_smb3_do_mount(struct file_system_type *fs_type,
939 int flags, struct smb3_fs_context *old_ctx)
941 struct cifs_mnt_data mnt_data;
942 struct cifs_sb_info *cifs_sb;
943 struct super_block *sb;
948 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
949 old_ctx->source, flags);
951 cifs_info("Attempting to mount %s\n", old_ctx->source);
954 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
956 return ERR_PTR(-ENOMEM);
958 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
960 root = ERR_PTR(-ENOMEM);
963 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
969 rc = cifs_setup_cifs_sb(cifs_sb);
975 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
977 if (!(flags & SB_SILENT))
978 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
984 mnt_data.ctx = cifs_sb->ctx;
985 mnt_data.cifs_sb = cifs_sb;
986 mnt_data.flags = flags;
988 /* BB should we make this contingent on mount parm? */
989 flags |= SB_NODIRATIME | SB_NOATIME;
991 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
993 cifs_umount(cifs_sb);
998 cifs_dbg(FYI, "Use existing superblock\n");
999 cifs_umount(cifs_sb);
1002 rc = cifs_read_super(sb);
1008 sb->s_flags |= SB_ACTIVE;
1011 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
1016 cifs_sb->root = dget(root);
1018 cifs_dbg(FYI, "dentry root is: %p\n", root);
1022 deactivate_locked_super(sb);
1025 kfree(cifs_sb->prepath);
1026 smb3_cleanup_fs_context(cifs_sb->ctx);
1031 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1033 struct cifsFileInfo *cfile = file->private_data;
1034 struct cifs_tcon *tcon;
1037 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1038 * the cached file length
1040 if (whence != SEEK_SET && whence != SEEK_CUR) {
1042 struct inode *inode = file_inode(file);
1045 * We need to be sure that all dirty pages are written and the
1046 * server has the newest file length.
1048 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1049 inode->i_mapping->nrpages != 0) {
1050 rc = filemap_fdatawait(inode->i_mapping);
1052 mapping_set_error(inode->i_mapping, rc);
1057 * Some applications poll for the file length in this strange
1058 * way so we must seek to end on non-oplocked files by
1059 * setting the revalidate time to zero.
1061 CIFS_I(inode)->time = 0;
1063 rc = cifs_revalidate_file_attr(file);
1067 if (cfile && cfile->tlink) {
1068 tcon = tlink_tcon(cfile->tlink);
1069 if (tcon->ses->server->ops->llseek)
1070 return tcon->ses->server->ops->llseek(file, tcon,
1073 return generic_file_llseek(file, offset, whence);
1077 cifs_setlease(struct file *file, int arg, struct file_lease **lease, void **priv)
1080 * Note that this is called by vfs setlease with i_lock held to
1081 * protect *lease from going away.
1083 struct inode *inode = file_inode(file);
1084 struct cifsFileInfo *cfile = file->private_data;
1086 /* Check if file is oplocked if this is request for new lease */
1087 if (arg == F_UNLCK ||
1088 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1089 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1090 return generic_setlease(file, arg, lease, priv);
1091 else if (tlink_tcon(cfile->tlink)->local_lease &&
1092 !CIFS_CACHE_READ(CIFS_I(inode)))
1094 * If the server claims to support oplock on this file, then we
1095 * still need to check oplock even if the local_lease mount
1096 * option is set, but there are servers which do not support
1097 * oplock for which this mount option may be useful if the user
1098 * knows that the file won't be changed on the server by anyone
1101 return generic_setlease(file, arg, lease, priv);
1106 struct file_system_type cifs_fs_type = {
1107 .owner = THIS_MODULE,
1109 .init_fs_context = smb3_init_fs_context,
1110 .parameters = smb3_fs_parameters,
1111 .kill_sb = cifs_kill_sb,
1112 .fs_flags = FS_RENAME_DOES_D_MOVE,
1114 MODULE_ALIAS_FS("cifs");
1116 struct file_system_type smb3_fs_type = {
1117 .owner = THIS_MODULE,
1119 .init_fs_context = smb3_init_fs_context,
1120 .parameters = smb3_fs_parameters,
1121 .kill_sb = cifs_kill_sb,
1122 .fs_flags = FS_RENAME_DOES_D_MOVE,
1124 MODULE_ALIAS_FS("smb3");
1125 MODULE_ALIAS("smb3");
1127 const struct inode_operations cifs_dir_inode_ops = {
1128 .create = cifs_create,
1129 .atomic_open = cifs_atomic_open,
1130 .lookup = cifs_lookup,
1131 .getattr = cifs_getattr,
1132 .unlink = cifs_unlink,
1133 .link = cifs_hardlink,
1134 .mkdir = cifs_mkdir,
1135 .rmdir = cifs_rmdir,
1136 .rename = cifs_rename2,
1137 .permission = cifs_permission,
1138 .setattr = cifs_setattr,
1139 .symlink = cifs_symlink,
1140 .mknod = cifs_mknod,
1141 .listxattr = cifs_listxattr,
1142 .get_acl = cifs_get_acl,
1143 .set_acl = cifs_set_acl,
1146 const struct inode_operations cifs_file_inode_ops = {
1147 .setattr = cifs_setattr,
1148 .getattr = cifs_getattr,
1149 .permission = cifs_permission,
1150 .listxattr = cifs_listxattr,
1151 .fiemap = cifs_fiemap,
1152 .get_acl = cifs_get_acl,
1153 .set_acl = cifs_set_acl,
1156 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1157 struct delayed_call *done)
1162 return ERR_PTR(-ECHILD);
1164 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1166 return ERR_PTR(-ENOMEM);
1168 spin_lock(&inode->i_lock);
1169 if (likely(CIFS_I(inode)->symlink_target)) {
1170 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1173 target_path = ERR_PTR(-EOPNOTSUPP);
1175 spin_unlock(&inode->i_lock);
1177 if (!IS_ERR(target_path))
1178 set_delayed_call(done, kfree_link, target_path);
1183 const struct inode_operations cifs_symlink_inode_ops = {
1184 .get_link = cifs_get_link,
1185 .setattr = cifs_setattr,
1186 .permission = cifs_permission,
1187 .listxattr = cifs_listxattr,
1191 * Advance the EOF marker to after the source range.
1193 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1194 struct cifs_tcon *src_tcon,
1195 unsigned int xid, loff_t src_end)
1197 struct cifsFileInfo *writeable_srcfile;
1200 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1201 if (writeable_srcfile) {
1202 if (src_tcon->ses->server->ops->set_file_size)
1203 rc = src_tcon->ses->server->ops->set_file_size(
1204 xid, src_tcon, writeable_srcfile,
1205 src_inode->i_size, true /* no need to set sparse */);
1208 cifsFileInfo_put(writeable_srcfile);
1209 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1215 netfs_resize_file(&src_cifsi->netfs, src_end, true);
1216 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1220 return filemap_write_and_wait(src_inode->i_mapping);
1224 * Flush out either the folio that overlaps the beginning of a range in which
1225 * pos resides or the folio that overlaps the end of a range unless that folio
1226 * is entirely within the range we're going to invalidate. We extend the flush
1227 * bounds to encompass the folio.
1229 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1232 struct folio *folio;
1233 unsigned long long fpos, fend;
1234 pgoff_t index = pos / PAGE_SIZE;
1238 folio = filemap_get_folio(inode->i_mapping, index);
1242 size = folio_size(folio);
1243 fpos = folio_pos(folio);
1244 fend = fpos + size - 1;
1245 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1246 *_fend = max_t(unsigned long long, *_fend, fend);
1247 if ((first && pos == fpos) || (!first && pos == fend))
1250 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1256 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1257 struct file *dst_file, loff_t destoff, loff_t len,
1258 unsigned int remap_flags)
1260 struct inode *src_inode = file_inode(src_file);
1261 struct inode *target_inode = file_inode(dst_file);
1262 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1263 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1264 struct cifsFileInfo *smb_file_src = src_file->private_data;
1265 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1266 struct cifs_tcon *target_tcon, *src_tcon;
1267 unsigned long long destend, fstart, fend, old_size, new_size;
1271 if (remap_flags & REMAP_FILE_DEDUP)
1273 if (remap_flags & ~REMAP_FILE_ADVISORY)
1276 cifs_dbg(FYI, "clone range\n");
1280 if (!smb_file_src || !smb_file_target) {
1282 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1286 src_tcon = tlink_tcon(smb_file_src->tlink);
1287 target_tcon = tlink_tcon(smb_file_target->tlink);
1290 * Note: cifs case is easier than btrfs since server responsible for
1291 * checks for proper open modes and file type and if it wants
1292 * server could even support copy of range where source = target
1294 lock_two_nondirectories(target_inode, src_inode);
1297 len = src_inode->i_size - off;
1299 cifs_dbg(FYI, "clone range\n");
1301 /* Flush the source buffer */
1302 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1307 /* The server-side copy will fail if the source crosses the EOF marker.
1308 * Advance the EOF marker after the flush above to the end of the range
1309 * if it's short of that.
1311 if (src_cifsi->netfs.remote_i_size < off + len) {
1312 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1317 new_size = destoff + len;
1318 destend = destoff + len - 1;
1320 /* Flush the folios at either end of the destination range to prevent
1321 * accidental loss of dirty data outside of the range.
1326 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1329 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1332 if (fend > target_cifsi->netfs.zero_point)
1333 target_cifsi->netfs.zero_point = fend + 1;
1334 old_size = target_cifsi->netfs.remote_i_size;
1336 /* Discard all the folios that overlap the destination region. */
1337 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1338 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1340 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1341 i_size_read(target_inode), 0);
1344 if (target_tcon->ses->server->ops->duplicate_extents) {
1345 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1346 smb_file_src, smb_file_target, off, len, destoff);
1347 if (rc == 0 && new_size > old_size) {
1348 truncate_setsize(target_inode, new_size);
1349 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1352 if (rc == 0 && new_size > target_cifsi->netfs.zero_point)
1353 target_cifsi->netfs.zero_point = new_size;
1356 /* force revalidate of size and timestamps of target file now
1357 that target is updated on the server */
1358 CIFS_I(target_inode)->time = 0;
1360 /* although unlocking in the reverse order from locking is not
1361 strictly necessary here it is a little cleaner to be consistent */
1362 unlock_two_nondirectories(src_inode, target_inode);
1365 return rc < 0 ? rc : len;
1368 ssize_t cifs_file_copychunk_range(unsigned int xid,
1369 struct file *src_file, loff_t off,
1370 struct file *dst_file, loff_t destoff,
1371 size_t len, unsigned int flags)
1373 struct inode *src_inode = file_inode(src_file);
1374 struct inode *target_inode = file_inode(dst_file);
1375 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1376 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1377 struct cifsFileInfo *smb_file_src;
1378 struct cifsFileInfo *smb_file_target;
1379 struct cifs_tcon *src_tcon;
1380 struct cifs_tcon *target_tcon;
1383 cifs_dbg(FYI, "copychunk range\n");
1385 if (!src_file->private_data || !dst_file->private_data) {
1387 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1392 smb_file_target = dst_file->private_data;
1393 smb_file_src = src_file->private_data;
1394 src_tcon = tlink_tcon(smb_file_src->tlink);
1395 target_tcon = tlink_tcon(smb_file_target->tlink);
1397 if (src_tcon->ses != target_tcon->ses) {
1398 cifs_dbg(FYI, "source and target of copy not on same server\n");
1403 if (!target_tcon->ses->server->ops->copychunk_range)
1407 * Note: cifs case is easier than btrfs since server responsible for
1408 * checks for proper open modes and file type and if it wants
1409 * server could even support copy of range where source = target
1411 lock_two_nondirectories(target_inode, src_inode);
1413 cifs_dbg(FYI, "about to flush pages\n");
1415 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1420 /* The server-side copy will fail if the source crosses the EOF marker.
1421 * Advance the EOF marker after the flush above to the end of the range
1422 * if it's short of that.
1424 if (src_cifsi->netfs.remote_i_size < off + len) {
1425 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1430 /* Flush and invalidate all the folios in the destination region. If
1431 * the copy was successful, then some of the flush is extra overhead,
1432 * but we need to allow for the copy failing in some way (eg. ENOSPC).
1434 rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
1438 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1439 i_size_read(target_inode), 0);
1441 rc = file_modified(dst_file);
1443 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1444 smb_file_src, smb_file_target, off, len, destoff);
1445 if (rc > 0 && destoff + rc > i_size_read(target_inode)) {
1446 truncate_setsize(target_inode, destoff + rc);
1447 netfs_resize_file(&target_cifsi->netfs,
1448 i_size_read(target_inode), true);
1449 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1450 i_size_read(target_inode));
1452 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point)
1453 target_cifsi->netfs.zero_point = destoff + rc;
1456 file_accessed(src_file);
1458 /* force revalidate of size and timestamps of target file now
1459 * that target is updated on the server
1461 CIFS_I(target_inode)->time = 0;
1464 /* although unlocking in the reverse order from locking is not
1465 * strictly necessary here it is a little cleaner to be consistent
1467 unlock_two_nondirectories(src_inode, target_inode);
1474 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1475 * is a dummy operation.
1477 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1479 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1485 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1486 struct file *dst_file, loff_t destoff,
1487 size_t len, unsigned int flags)
1489 unsigned int xid = get_xid();
1491 struct cifsFileInfo *cfile = dst_file->private_data;
1493 if (cfile->swapfile) {
1499 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1503 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1504 rc = splice_copy_file_range(src_file, off, dst_file,
1509 const struct file_operations cifs_file_ops = {
1510 .read_iter = cifs_loose_read_iter,
1511 .write_iter = cifs_file_write_iter,
1513 .release = cifs_close,
1515 .flock = cifs_flock,
1516 .fsync = cifs_fsync,
1517 .flush = cifs_flush,
1518 .mmap = cifs_file_mmap,
1519 .splice_read = filemap_splice_read,
1520 .splice_write = iter_file_splice_write,
1521 .llseek = cifs_llseek,
1522 .unlocked_ioctl = cifs_ioctl,
1523 .copy_file_range = cifs_copy_file_range,
1524 .remap_file_range = cifs_remap_file_range,
1525 .setlease = cifs_setlease,
1526 .fallocate = cifs_fallocate,
1529 const struct file_operations cifs_file_strict_ops = {
1530 .read_iter = cifs_strict_readv,
1531 .write_iter = cifs_strict_writev,
1533 .release = cifs_close,
1535 .flock = cifs_flock,
1536 .fsync = cifs_strict_fsync,
1537 .flush = cifs_flush,
1538 .mmap = cifs_file_strict_mmap,
1539 .splice_read = filemap_splice_read,
1540 .splice_write = iter_file_splice_write,
1541 .llseek = cifs_llseek,
1542 .unlocked_ioctl = cifs_ioctl,
1543 .copy_file_range = cifs_copy_file_range,
1544 .remap_file_range = cifs_remap_file_range,
1545 .setlease = cifs_setlease,
1546 .fallocate = cifs_fallocate,
1549 const struct file_operations cifs_file_direct_ops = {
1550 .read_iter = netfs_unbuffered_read_iter,
1551 .write_iter = netfs_file_write_iter,
1553 .release = cifs_close,
1555 .flock = cifs_flock,
1556 .fsync = cifs_fsync,
1557 .flush = cifs_flush,
1558 .mmap = cifs_file_mmap,
1559 .splice_read = copy_splice_read,
1560 .splice_write = iter_file_splice_write,
1561 .unlocked_ioctl = cifs_ioctl,
1562 .copy_file_range = cifs_copy_file_range,
1563 .remap_file_range = cifs_remap_file_range,
1564 .llseek = cifs_llseek,
1565 .setlease = cifs_setlease,
1566 .fallocate = cifs_fallocate,
1569 const struct file_operations cifs_file_nobrl_ops = {
1570 .read_iter = cifs_loose_read_iter,
1571 .write_iter = cifs_file_write_iter,
1573 .release = cifs_close,
1574 .fsync = cifs_fsync,
1575 .flush = cifs_flush,
1576 .mmap = cifs_file_mmap,
1577 .splice_read = filemap_splice_read,
1578 .splice_write = iter_file_splice_write,
1579 .llseek = cifs_llseek,
1580 .unlocked_ioctl = cifs_ioctl,
1581 .copy_file_range = cifs_copy_file_range,
1582 .remap_file_range = cifs_remap_file_range,
1583 .setlease = cifs_setlease,
1584 .fallocate = cifs_fallocate,
1587 const struct file_operations cifs_file_strict_nobrl_ops = {
1588 .read_iter = cifs_strict_readv,
1589 .write_iter = cifs_strict_writev,
1591 .release = cifs_close,
1592 .fsync = cifs_strict_fsync,
1593 .flush = cifs_flush,
1594 .mmap = cifs_file_strict_mmap,
1595 .splice_read = filemap_splice_read,
1596 .splice_write = iter_file_splice_write,
1597 .llseek = cifs_llseek,
1598 .unlocked_ioctl = cifs_ioctl,
1599 .copy_file_range = cifs_copy_file_range,
1600 .remap_file_range = cifs_remap_file_range,
1601 .setlease = cifs_setlease,
1602 .fallocate = cifs_fallocate,
1605 const struct file_operations cifs_file_direct_nobrl_ops = {
1606 .read_iter = netfs_unbuffered_read_iter,
1607 .write_iter = netfs_file_write_iter,
1609 .release = cifs_close,
1610 .fsync = cifs_fsync,
1611 .flush = cifs_flush,
1612 .mmap = cifs_file_mmap,
1613 .splice_read = copy_splice_read,
1614 .splice_write = iter_file_splice_write,
1615 .unlocked_ioctl = cifs_ioctl,
1616 .copy_file_range = cifs_copy_file_range,
1617 .remap_file_range = cifs_remap_file_range,
1618 .llseek = cifs_llseek,
1619 .setlease = cifs_setlease,
1620 .fallocate = cifs_fallocate,
1623 const struct file_operations cifs_dir_ops = {
1624 .iterate_shared = cifs_readdir,
1625 .release = cifs_closedir,
1626 .read = generic_read_dir,
1627 .unlocked_ioctl = cifs_ioctl,
1628 .copy_file_range = cifs_copy_file_range,
1629 .remap_file_range = cifs_remap_file_range,
1630 .llseek = generic_file_llseek,
1631 .fsync = cifs_dir_fsync,
1635 cifs_init_once(void *inode)
1637 struct cifsInodeInfo *cifsi = inode;
1639 inode_init_once(&cifsi->netfs.inode);
1640 init_rwsem(&cifsi->lock_sem);
1644 cifs_init_inodecache(void)
1646 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1647 sizeof(struct cifsInodeInfo),
1648 0, (SLAB_RECLAIM_ACCOUNT|
1651 if (cifs_inode_cachep == NULL)
1658 cifs_destroy_inodecache(void)
1661 * Make sure all delayed rcu free inodes are flushed before we
1665 kmem_cache_destroy(cifs_inode_cachep);
1669 cifs_init_request_bufs(void)
1672 * SMB2 maximum header size is bigger than CIFS one - no problems to
1673 * allocate some more bytes for CIFS.
1675 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1677 if (CIFSMaxBufSize < 8192) {
1678 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1679 Unicode path name has to fit in any SMB/CIFS path based frames */
1680 CIFSMaxBufSize = 8192;
1681 } else if (CIFSMaxBufSize > 1024*127) {
1682 CIFSMaxBufSize = 1024 * 127;
1684 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1687 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1688 CIFSMaxBufSize, CIFSMaxBufSize);
1690 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1691 CIFSMaxBufSize + max_hdr_size, 0,
1692 SLAB_HWCACHE_ALIGN, 0,
1693 CIFSMaxBufSize + max_hdr_size,
1695 if (cifs_req_cachep == NULL)
1698 if (cifs_min_rcv < 1)
1700 else if (cifs_min_rcv > 64) {
1702 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1705 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1708 if (cifs_req_poolp == NULL) {
1709 kmem_cache_destroy(cifs_req_cachep);
1712 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1713 almost all handle based requests (but not write response, nor is it
1714 sufficient for path based requests). A smaller size would have
1715 been more efficient (compacting multiple slab items on one 4k page)
1716 for the case in which debug was on, but this larger size allows
1717 more SMBs to use small buffer alloc and is still much more
1718 efficient to alloc 1 per page off the slab compared to 17K (5page)
1719 alloc of large cifs buffers even when page debugging is on */
1720 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1721 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1722 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1723 if (cifs_sm_req_cachep == NULL) {
1724 mempool_destroy(cifs_req_poolp);
1725 kmem_cache_destroy(cifs_req_cachep);
1729 if (cifs_min_small < 2)
1731 else if (cifs_min_small > 256) {
1732 cifs_min_small = 256;
1733 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1736 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1737 cifs_sm_req_cachep);
1739 if (cifs_sm_req_poolp == NULL) {
1740 mempool_destroy(cifs_req_poolp);
1741 kmem_cache_destroy(cifs_req_cachep);
1742 kmem_cache_destroy(cifs_sm_req_cachep);
1750 cifs_destroy_request_bufs(void)
1752 mempool_destroy(cifs_req_poolp);
1753 kmem_cache_destroy(cifs_req_cachep);
1754 mempool_destroy(cifs_sm_req_poolp);
1755 kmem_cache_destroy(cifs_sm_req_cachep);
1758 static int init_mids(void)
1760 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1761 sizeof(struct mid_q_entry), 0,
1762 SLAB_HWCACHE_ALIGN, NULL);
1763 if (cifs_mid_cachep == NULL)
1766 /* 3 is a reasonable minimum number of simultaneous operations */
1767 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1768 if (cifs_mid_poolp == NULL) {
1769 kmem_cache_destroy(cifs_mid_cachep);
1776 static void destroy_mids(void)
1778 mempool_destroy(cifs_mid_poolp);
1779 kmem_cache_destroy(cifs_mid_cachep);
1782 static int cifs_init_netfs(void)
1784 cifs_io_request_cachep =
1785 kmem_cache_create("cifs_io_request",
1786 sizeof(struct cifs_io_request), 0,
1787 SLAB_HWCACHE_ALIGN, NULL);
1788 if (!cifs_io_request_cachep)
1791 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
1794 cifs_io_subrequest_cachep =
1795 kmem_cache_create("cifs_io_subrequest",
1796 sizeof(struct cifs_io_subrequest), 0,
1797 SLAB_HWCACHE_ALIGN, NULL);
1798 if (!cifs_io_subrequest_cachep)
1801 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
1802 goto nomem_subreqpool;
1807 kmem_cache_destroy(cifs_io_subrequest_cachep);
1809 mempool_exit(&cifs_io_request_pool);
1811 kmem_cache_destroy(cifs_io_request_cachep);
1816 static void cifs_destroy_netfs(void)
1818 mempool_exit(&cifs_io_subrequest_pool);
1819 kmem_cache_destroy(cifs_io_subrequest_cachep);
1820 mempool_exit(&cifs_io_request_pool);
1821 kmem_cache_destroy(cifs_io_request_cachep);
1829 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1831 * Initialize Global counters
1833 atomic_set(&sesInfoAllocCount, 0);
1834 atomic_set(&tconInfoAllocCount, 0);
1835 atomic_set(&tcpSesNextId, 0);
1836 atomic_set(&tcpSesAllocCount, 0);
1837 atomic_set(&tcpSesReconnectCount, 0);
1838 atomic_set(&tconInfoReconnectCount, 0);
1840 atomic_set(&buf_alloc_count, 0);
1841 atomic_set(&small_buf_alloc_count, 0);
1842 #ifdef CONFIG_CIFS_STATS2
1843 atomic_set(&total_buf_alloc_count, 0);
1844 atomic_set(&total_small_buf_alloc_count, 0);
1845 if (slow_rsp_threshold < 1)
1846 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1847 else if (slow_rsp_threshold > 32767)
1849 "slow response threshold set higher than recommended (0 to 32767)\n");
1850 #endif /* CONFIG_CIFS_STATS2 */
1852 atomic_set(&mid_count, 0);
1853 GlobalCurrentXid = 0;
1854 GlobalTotalActiveXid = 0;
1855 GlobalMaxActiveXid = 0;
1856 spin_lock_init(&cifs_tcp_ses_lock);
1857 spin_lock_init(&GlobalMid_Lock);
1859 cifs_lock_secret = get_random_u32();
1861 if (cifs_max_pending < 2) {
1862 cifs_max_pending = 2;
1863 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1864 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1865 cifs_max_pending = CIFS_MAX_REQ;
1866 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1870 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1871 if (dir_cache_timeout > 65000) {
1872 dir_cache_timeout = 65000;
1873 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1876 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1879 goto out_clean_proc;
1883 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1884 * so that we don't launch too many worker threads but
1885 * Documentation/core-api/workqueue.rst recommends setting it to 0
1888 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1889 decrypt_wq = alloc_workqueue("smb3decryptd",
1890 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1893 goto out_destroy_cifsiod_wq;
1896 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1897 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1898 if (!fileinfo_put_wq) {
1900 goto out_destroy_decrypt_wq;
1903 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1904 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1905 if (!cifsoplockd_wq) {
1907 goto out_destroy_fileinfo_put_wq;
1910 deferredclose_wq = alloc_workqueue("deferredclose",
1911 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1912 if (!deferredclose_wq) {
1914 goto out_destroy_cifsoplockd_wq;
1917 serverclose_wq = alloc_workqueue("serverclose",
1918 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1919 if (!serverclose_wq) {
1921 goto out_destroy_deferredclose_wq;
1924 cfid_put_wq = alloc_workqueue("cfid_put_wq",
1925 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1928 goto out_destroy_serverclose_wq;
1931 rc = cifs_init_inodecache();
1933 goto out_destroy_cfid_put_wq;
1935 rc = cifs_init_netfs();
1937 goto out_destroy_inodecache;
1941 goto out_destroy_netfs;
1943 rc = cifs_init_request_bufs();
1945 goto out_destroy_mids;
1947 #ifdef CONFIG_CIFS_DFS_UPCALL
1948 rc = dfs_cache_init();
1950 goto out_destroy_request_bufs;
1951 #endif /* CONFIG_CIFS_DFS_UPCALL */
1952 #ifdef CONFIG_CIFS_UPCALL
1953 rc = init_cifs_spnego();
1955 goto out_destroy_dfs_cache;
1956 #endif /* CONFIG_CIFS_UPCALL */
1957 #ifdef CONFIG_CIFS_SWN_UPCALL
1958 rc = cifs_genl_init();
1960 goto out_register_key_type;
1961 #endif /* CONFIG_CIFS_SWN_UPCALL */
1963 rc = init_cifs_idmap();
1965 goto out_cifs_swn_init;
1967 rc = register_filesystem(&cifs_fs_type);
1969 goto out_init_cifs_idmap;
1971 rc = register_filesystem(&smb3_fs_type);
1973 unregister_filesystem(&cifs_fs_type);
1974 goto out_init_cifs_idmap;
1979 out_init_cifs_idmap:
1982 #ifdef CONFIG_CIFS_SWN_UPCALL
1984 out_register_key_type:
1986 #ifdef CONFIG_CIFS_UPCALL
1988 out_destroy_dfs_cache:
1990 #ifdef CONFIG_CIFS_DFS_UPCALL
1991 dfs_cache_destroy();
1992 out_destroy_request_bufs:
1994 cifs_destroy_request_bufs();
1998 cifs_destroy_netfs();
1999 out_destroy_inodecache:
2000 cifs_destroy_inodecache();
2001 out_destroy_cfid_put_wq:
2002 destroy_workqueue(cfid_put_wq);
2003 out_destroy_serverclose_wq:
2004 destroy_workqueue(serverclose_wq);
2005 out_destroy_deferredclose_wq:
2006 destroy_workqueue(deferredclose_wq);
2007 out_destroy_cifsoplockd_wq:
2008 destroy_workqueue(cifsoplockd_wq);
2009 out_destroy_fileinfo_put_wq:
2010 destroy_workqueue(fileinfo_put_wq);
2011 out_destroy_decrypt_wq:
2012 destroy_workqueue(decrypt_wq);
2013 out_destroy_cifsiod_wq:
2014 destroy_workqueue(cifsiod_wq);
2023 cifs_dbg(NOISY, "exit_smb3\n");
2024 unregister_filesystem(&cifs_fs_type);
2025 unregister_filesystem(&smb3_fs_type);
2026 cifs_release_automount_timer();
2028 #ifdef CONFIG_CIFS_SWN_UPCALL
2031 #ifdef CONFIG_CIFS_UPCALL
2034 #ifdef CONFIG_CIFS_DFS_UPCALL
2035 dfs_cache_destroy();
2037 cifs_destroy_request_bufs();
2039 cifs_destroy_netfs();
2040 cifs_destroy_inodecache();
2041 destroy_workqueue(deferredclose_wq);
2042 destroy_workqueue(cifsoplockd_wq);
2043 destroy_workqueue(decrypt_wq);
2044 destroy_workqueue(fileinfo_put_wq);
2045 destroy_workqueue(serverclose_wq);
2046 destroy_workqueue(cfid_put_wq);
2047 destroy_workqueue(cifsiod_wq);
2051 MODULE_AUTHOR("Steve French");
2052 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2054 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2055 "also older servers complying with the SNIA CIFS Specification)");
2056 MODULE_VERSION(CIFS_VERSION);
2057 MODULE_SOFTDEP("ecb");
2058 MODULE_SOFTDEP("hmac");
2059 MODULE_SOFTDEP("md5");
2060 MODULE_SOFTDEP("nls");
2061 MODULE_SOFTDEP("aes");
2062 MODULE_SOFTDEP("cmac");
2063 MODULE_SOFTDEP("sha256");
2064 MODULE_SOFTDEP("sha512");
2065 MODULE_SOFTDEP("aead2");
2066 MODULE_SOFTDEP("ccm");
2067 MODULE_SOFTDEP("gcm");
2068 module_init(init_cifs)
2069 module_exit(exit_cifs)