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/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_Sem */
79 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
80 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
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: n/N/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 extern mempool_t *cifs_sm_req_poolp;
155 extern mempool_t *cifs_req_poolp;
156 extern mempool_t *cifs_mid_poolp;
158 struct workqueue_struct *cifsiod_wq;
159 struct workqueue_struct *decrypt_wq;
160 struct workqueue_struct *fileinfo_put_wq;
161 struct workqueue_struct *cifsoplockd_wq;
162 struct workqueue_struct *deferredclose_wq;
163 __u32 cifs_lock_secret;
166 * Bumps refcount for cifs super block.
167 * Note that it should be only called if a referece to VFS super block is
168 * already held, e.g. in open-type syscalls context. Otherwise it can race with
169 * atomic_dec_and_test in deactivate_locked_super.
172 cifs_sb_active(struct super_block *sb)
174 struct cifs_sb_info *server = CIFS_SB(sb);
176 if (atomic_inc_return(&server->active) == 1)
177 atomic_inc(&sb->s_active);
181 cifs_sb_deactive(struct super_block *sb)
183 struct cifs_sb_info *server = CIFS_SB(sb);
185 if (atomic_dec_and_test(&server->active))
186 deactivate_super(sb);
190 cifs_read_super(struct super_block *sb)
193 struct cifs_sb_info *cifs_sb;
194 struct cifs_tcon *tcon;
195 struct timespec64 ts;
198 cifs_sb = CIFS_SB(sb);
199 tcon = cifs_sb_master_tcon(cifs_sb);
201 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
202 sb->s_flags |= SB_POSIXACL;
204 if (tcon->snapshot_time)
205 sb->s_flags |= SB_RDONLY;
207 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
208 sb->s_maxbytes = MAX_LFS_FILESIZE;
210 sb->s_maxbytes = MAX_NON_LFS;
213 * Some very old servers like DOS and OS/2 used 2 second granularity
214 * (while all current servers use 100ns granularity - see MS-DTYP)
215 * but 1 second is the maximum allowed granularity for the VFS
216 * so for old servers set time granularity to 1 second while for
217 * everything else (current servers) set it to 100ns.
219 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
220 ((tcon->ses->capabilities &
221 tcon->ses->server->vals->cap_nt_find) == 0) &&
223 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
224 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
225 sb->s_time_min = ts.tv_sec;
226 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
227 cpu_to_le16(SMB_TIME_MAX), 0);
228 sb->s_time_max = ts.tv_sec;
231 * Almost every server, including all SMB2+, uses DCE TIME
232 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
234 sb->s_time_gran = 100;
235 ts = cifs_NTtimeToUnix(0);
236 sb->s_time_min = ts.tv_sec;
237 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
238 sb->s_time_max = ts.tv_sec;
241 sb->s_magic = CIFS_SUPER_MAGIC;
242 sb->s_op = &cifs_super_ops;
243 sb->s_xattr = cifs_xattr_handlers;
244 rc = super_setup_bdi(sb);
247 /* tune readahead according to rsize if readahead size not set on mount */
248 if (cifs_sb->ctx->rsize == 0)
249 cifs_sb->ctx->rsize =
250 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
251 if (cifs_sb->ctx->rasize)
252 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
254 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
256 sb->s_blocksize = CIFS_MAX_MSGSIZE;
257 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
258 inode = cifs_root_iget(sb);
266 sb->s_d_op = &cifs_ci_dentry_ops;
268 sb->s_d_op = &cifs_dentry_ops;
270 sb->s_root = d_make_root(inode);
276 #ifdef CONFIG_CIFS_NFSD_EXPORT
277 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
278 cifs_dbg(FYI, "export ops supported\n");
279 sb->s_export_op = &cifs_export_ops;
281 #endif /* CONFIG_CIFS_NFSD_EXPORT */
286 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
290 static void cifs_kill_sb(struct super_block *sb)
292 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
295 * We ned to release all dentries for the cached directories
296 * before we kill the sb.
299 close_all_cached_dirs(cifs_sb);
301 /* finally release root dentry */
303 cifs_sb->root = NULL;
307 cifs_umount(cifs_sb);
311 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
313 struct super_block *sb = dentry->d_sb;
314 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
315 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
316 struct TCP_Server_Info *server = tcon->ses->server;
322 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
324 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
326 buf->f_namelen = PATH_MAX;
328 buf->f_fsid.val[0] = tcon->vol_serial_number;
329 /* are using part of create time for more randomness, see man statfs */
330 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
332 buf->f_files = 0; /* undefined */
333 buf->f_ffree = 0; /* unlimited */
335 if (server->ops->queryfs)
336 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
342 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
344 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
345 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
346 struct TCP_Server_Info *server = tcon->ses->server;
348 if (server->ops->fallocate)
349 return server->ops->fallocate(file, tcon, mode, off, len);
354 static int cifs_permission(struct mnt_idmap *idmap,
355 struct inode *inode, int mask)
357 struct cifs_sb_info *cifs_sb;
359 cifs_sb = CIFS_SB(inode->i_sb);
361 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
362 if ((mask & MAY_EXEC) && !execute_ok(inode))
366 } else /* file mode might have been restricted at mount time
367 on the client (above and beyond ACL on servers) for
368 servers which do not support setting and viewing mode bits,
369 so allowing client to check permissions is useful */
370 return generic_permission(&nop_mnt_idmap, inode, mask);
373 static struct kmem_cache *cifs_inode_cachep;
374 static struct kmem_cache *cifs_req_cachep;
375 static struct kmem_cache *cifs_mid_cachep;
376 static struct kmem_cache *cifs_sm_req_cachep;
377 mempool_t *cifs_sm_req_poolp;
378 mempool_t *cifs_req_poolp;
379 mempool_t *cifs_mid_poolp;
381 static struct inode *
382 cifs_alloc_inode(struct super_block *sb)
384 struct cifsInodeInfo *cifs_inode;
385 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
388 cifs_inode->cifsAttrs = 0x20; /* default */
389 cifs_inode->time = 0;
391 * Until the file is open and we have gotten oplock info back from the
392 * server, can not assume caching of file data or metadata.
394 cifs_set_oplock_level(cifs_inode, 0);
395 cifs_inode->flags = 0;
396 spin_lock_init(&cifs_inode->writers_lock);
397 cifs_inode->writers = 0;
398 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
399 cifs_inode->server_eof = 0;
400 cifs_inode->uniqueid = 0;
401 cifs_inode->createtime = 0;
402 cifs_inode->epoch = 0;
403 spin_lock_init(&cifs_inode->open_file_lock);
404 generate_random_uuid(cifs_inode->lease_key);
405 cifs_inode->symlink_target = NULL;
408 * Can not set i_flags here - they get immediately overwritten to zero
411 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
412 INIT_LIST_HEAD(&cifs_inode->openFileList);
413 INIT_LIST_HEAD(&cifs_inode->llist);
414 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
415 spin_lock_init(&cifs_inode->deferred_lock);
416 return &cifs_inode->netfs.inode;
420 cifs_free_inode(struct inode *inode)
422 struct cifsInodeInfo *cinode = CIFS_I(inode);
424 if (S_ISLNK(inode->i_mode))
425 kfree(cinode->symlink_target);
426 kmem_cache_free(cifs_inode_cachep, cinode);
430 cifs_evict_inode(struct inode *inode)
432 truncate_inode_pages_final(&inode->i_data);
433 if (inode->i_state & I_PINNING_FSCACHE_WB)
434 cifs_fscache_unuse_inode_cookie(inode, true);
435 cifs_fscache_release_inode_cookie(inode);
440 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
442 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
443 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
445 seq_puts(s, ",addr=");
447 switch (server->dstaddr.ss_family) {
449 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
452 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
453 if (sa6->sin6_scope_id)
454 seq_printf(s, "%%%u", sa6->sin6_scope_id);
457 seq_puts(s, "(unknown)");
460 seq_puts(s, ",rdma");
464 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
466 if (ses->sectype == Unspecified) {
467 if (ses->user_name == NULL)
468 seq_puts(s, ",sec=none");
472 seq_puts(s, ",sec=");
474 switch (ses->sectype) {
476 seq_puts(s, "ntlmv2");
482 seq_puts(s, "ntlmssp");
485 /* shouldn't ever happen */
486 seq_puts(s, "unknown");
493 if (ses->sectype == Kerberos)
494 seq_printf(s, ",cruid=%u",
495 from_kuid_munged(&init_user_ns, ses->cred_uid));
499 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
501 seq_puts(s, ",cache=");
503 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
504 seq_puts(s, "strict");
505 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
507 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
508 seq_puts(s, "singleclient"); /* assume only one client access */
509 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
510 seq_puts(s, "ro"); /* read only caching assumed */
512 seq_puts(s, "loose");
516 * cifs_show_devname() is used so we show the mount device name with correct
517 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
519 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
521 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
522 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
527 convert_delimiter(devname, '/');
528 /* escape all spaces in share names */
529 seq_escape(m, devname, " \t");
536 * cifs_show_options() is for displaying mount options in /proc/mounts.
537 * Not all settable options are displayed but most of the important
541 cifs_show_options(struct seq_file *s, struct dentry *root)
543 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
544 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
545 struct sockaddr *srcaddr;
546 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
548 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
549 cifs_show_security(s, tcon->ses);
550 cifs_show_cache_flavor(s, cifs_sb);
553 seq_puts(s, ",nolease");
554 if (cifs_sb->ctx->multiuser)
555 seq_puts(s, ",multiuser");
556 else if (tcon->ses->user_name)
557 seq_show_option(s, "username", tcon->ses->user_name);
559 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
560 seq_show_option(s, "domain", tcon->ses->domainName);
562 if (srcaddr->sa_family != AF_UNSPEC) {
563 struct sockaddr_in *saddr4;
564 struct sockaddr_in6 *saddr6;
565 saddr4 = (struct sockaddr_in *)srcaddr;
566 saddr6 = (struct sockaddr_in6 *)srcaddr;
567 if (srcaddr->sa_family == AF_INET6)
568 seq_printf(s, ",srcaddr=%pI6c",
570 else if (srcaddr->sa_family == AF_INET)
571 seq_printf(s, ",srcaddr=%pI4",
572 &saddr4->sin_addr.s_addr);
574 seq_printf(s, ",srcaddr=BAD-AF:%i",
575 (int)(srcaddr->sa_family));
578 seq_printf(s, ",uid=%u",
579 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
581 seq_puts(s, ",forceuid");
583 seq_puts(s, ",noforceuid");
585 seq_printf(s, ",gid=%u",
586 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
588 seq_puts(s, ",forcegid");
590 seq_puts(s, ",noforcegid");
592 cifs_show_address(s, tcon->ses->server);
595 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
596 cifs_sb->ctx->file_mode,
597 cifs_sb->ctx->dir_mode);
598 if (cifs_sb->ctx->iocharset)
599 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
601 seq_puts(s, ",seal");
602 else if (tcon->ses->server->ignore_signature)
603 seq_puts(s, ",signloosely");
605 seq_puts(s, ",nocase");
607 seq_puts(s, ",nodelete");
608 if (cifs_sb->ctx->no_sparse)
609 seq_puts(s, ",nosparse");
610 if (tcon->local_lease)
611 seq_puts(s, ",locallease");
613 seq_puts(s, ",hard");
615 seq_puts(s, ",soft");
616 if (tcon->use_persistent)
617 seq_puts(s, ",persistenthandles");
618 else if (tcon->use_resilient)
619 seq_puts(s, ",resilienthandles");
620 if (tcon->posix_extensions)
621 seq_puts(s, ",posix");
622 else if (tcon->unix_ext)
623 seq_puts(s, ",unix");
625 seq_puts(s, ",nounix");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
627 seq_puts(s, ",nodfs");
628 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
629 seq_puts(s, ",posixpaths");
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
631 seq_puts(s, ",setuids");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
633 seq_puts(s, ",idsfromsid");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
635 seq_puts(s, ",serverino");
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
637 seq_puts(s, ",rwpidforward");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
639 seq_puts(s, ",forcemand");
640 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
641 seq_puts(s, ",nouser_xattr");
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
643 seq_puts(s, ",mapchars");
644 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
645 seq_puts(s, ",mapposix");
646 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
649 seq_puts(s, ",nobrl");
650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
651 seq_puts(s, ",nohandlecache");
652 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
653 seq_puts(s, ",modefromsid");
654 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
655 seq_puts(s, ",cifsacl");
656 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
657 seq_puts(s, ",dynperm");
658 if (root->d_sb->s_flags & SB_POSIXACL)
660 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
661 seq_puts(s, ",mfsymlinks");
662 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
664 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
665 seq_puts(s, ",nostrictsync");
666 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
667 seq_puts(s, ",noperm");
668 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
669 seq_printf(s, ",backupuid=%u",
670 from_kuid_munged(&init_user_ns,
671 cifs_sb->ctx->backupuid));
672 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
673 seq_printf(s, ",backupgid=%u",
674 from_kgid_munged(&init_user_ns,
675 cifs_sb->ctx->backupgid));
677 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
678 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
679 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
680 if (cifs_sb->ctx->rasize)
681 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
682 if (tcon->ses->server->min_offload)
683 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
684 seq_printf(s, ",echo_interval=%lu",
685 tcon->ses->server->echo_interval / HZ);
687 /* Only display the following if overridden on mount */
688 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
689 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
690 if (tcon->ses->server->tcp_nodelay)
691 seq_puts(s, ",tcpnodelay");
692 if (tcon->ses->server->noautotune)
693 seq_puts(s, ",noautotune");
694 if (tcon->ses->server->noblocksnd)
695 seq_puts(s, ",noblocksend");
696 if (tcon->ses->server->nosharesock)
697 seq_puts(s, ",nosharesock");
699 if (tcon->snapshot_time)
700 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
701 if (tcon->handle_timeout)
702 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
703 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
704 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
707 * Display file and directory attribute timeout in seconds.
708 * If file and directory attribute timeout the same then actimeo
709 * was likely specified on mount
711 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
712 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
714 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
715 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
717 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
719 if (tcon->ses->chan_max > 1)
720 seq_printf(s, ",multichannel,max_channels=%zu",
721 tcon->ses->chan_max);
723 if (tcon->use_witness)
724 seq_puts(s, ",witness");
729 static void cifs_umount_begin(struct super_block *sb)
731 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
732 struct cifs_tcon *tcon;
737 tcon = cifs_sb_master_tcon(cifs_sb);
739 spin_lock(&cifs_tcp_ses_lock);
740 spin_lock(&tcon->tc_lock);
741 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
742 /* we have other mounts to same share or we have
743 already tried to umount this and woken up
744 all waiting network requests, nothing to do */
745 spin_unlock(&tcon->tc_lock);
746 spin_unlock(&cifs_tcp_ses_lock);
750 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
751 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
753 spin_unlock(&tcon->tc_lock);
754 spin_unlock(&cifs_tcp_ses_lock);
756 cifs_close_all_deferred_files(tcon);
757 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
758 /* cancel_notify_requests(tcon); */
759 if (tcon->ses && tcon->ses->server) {
760 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
761 wake_up_all(&tcon->ses->server->request_q);
762 wake_up_all(&tcon->ses->server->response_q);
763 msleep(1); /* yield */
764 /* we have to kick the requests once more */
765 wake_up_all(&tcon->ses->server->response_q);
772 static int cifs_freeze(struct super_block *sb)
774 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
775 struct cifs_tcon *tcon;
780 tcon = cifs_sb_master_tcon(cifs_sb);
782 cifs_close_all_deferred_files(tcon);
786 #ifdef CONFIG_CIFS_STATS2
787 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
794 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
796 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
800 static int cifs_drop_inode(struct inode *inode)
802 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
804 /* no serverino => unconditional eviction */
805 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
806 generic_drop_inode(inode);
809 static const struct super_operations cifs_super_ops = {
810 .statfs = cifs_statfs,
811 .alloc_inode = cifs_alloc_inode,
812 .write_inode = cifs_write_inode,
813 .free_inode = cifs_free_inode,
814 .drop_inode = cifs_drop_inode,
815 .evict_inode = cifs_evict_inode,
816 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
817 .show_devname = cifs_show_devname,
818 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
819 function unless later we add lazy close of inodes or unless the
820 kernel forgets to call us with the same number of releases (closes)
822 .show_options = cifs_show_options,
823 .umount_begin = cifs_umount_begin,
824 .freeze_fs = cifs_freeze,
825 #ifdef CONFIG_CIFS_STATS2
826 .show_stats = cifs_show_stats,
831 * Get root dentry from superblock according to prefix path mount option.
832 * Return dentry with refcount + 1 on success and NULL otherwise.
834 static struct dentry *
835 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
837 struct dentry *dentry;
838 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
839 char *full_path = NULL;
843 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
844 return dget(sb->s_root);
846 full_path = cifs_build_path_to_root(ctx, cifs_sb,
847 cifs_sb_master_tcon(cifs_sb), 0);
848 if (full_path == NULL)
849 return ERR_PTR(-ENOMEM);
851 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
853 sep = CIFS_DIR_SEP(cifs_sb);
854 dentry = dget(sb->s_root);
858 struct inode *dir = d_inode(dentry);
859 struct dentry *child;
861 if (!S_ISDIR(dir->i_mode)) {
863 dentry = ERR_PTR(-ENOTDIR);
867 /* skip separators */
874 while (*s && *s != sep)
877 child = lookup_positive_unlocked(p, dentry, s - p);
880 } while (!IS_ERR(dentry));
885 static int cifs_set_super(struct super_block *sb, void *data)
887 struct cifs_mnt_data *mnt_data = data;
888 sb->s_fs_info = mnt_data->cifs_sb;
889 return set_anon_super(sb, NULL);
893 cifs_smb3_do_mount(struct file_system_type *fs_type,
894 int flags, struct smb3_fs_context *old_ctx)
896 struct cifs_mnt_data mnt_data;
897 struct cifs_sb_info *cifs_sb;
898 struct super_block *sb;
903 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
904 old_ctx->source, flags);
906 cifs_info("Attempting to mount %s\n", old_ctx->source);
909 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
911 return ERR_PTR(-ENOMEM);
913 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
915 root = ERR_PTR(-ENOMEM);
918 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
924 rc = cifs_setup_cifs_sb(cifs_sb);
930 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
932 if (!(flags & SB_SILENT))
933 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
939 mnt_data.ctx = cifs_sb->ctx;
940 mnt_data.cifs_sb = cifs_sb;
941 mnt_data.flags = flags;
943 /* BB should we make this contingent on mount parm? */
944 flags |= SB_NODIRATIME | SB_NOATIME;
946 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
948 cifs_umount(cifs_sb);
953 cifs_dbg(FYI, "Use existing superblock\n");
954 cifs_umount(cifs_sb);
957 rc = cifs_read_super(sb);
963 sb->s_flags |= SB_ACTIVE;
966 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
971 cifs_sb->root = dget(root);
973 cifs_dbg(FYI, "dentry root is: %p\n", root);
977 deactivate_locked_super(sb);
980 kfree(cifs_sb->prepath);
981 smb3_cleanup_fs_context(cifs_sb->ctx);
988 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
991 struct inode *inode = file_inode(iocb->ki_filp);
993 if (iocb->ki_flags & IOCB_DIRECT)
994 return cifs_user_readv(iocb, iter);
996 rc = cifs_revalidate_mapping(inode);
1000 return generic_file_read_iter(iocb, iter);
1003 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1005 struct inode *inode = file_inode(iocb->ki_filp);
1006 struct cifsInodeInfo *cinode = CIFS_I(inode);
1010 if (iocb->ki_filp->f_flags & O_DIRECT) {
1011 written = cifs_user_writev(iocb, from);
1012 if (written > 0 && CIFS_CACHE_READ(cinode)) {
1013 cifs_zap_mapping(inode);
1015 "Set no oplock for inode=%p after a write operation\n",
1022 written = cifs_get_writer(cinode);
1026 written = generic_file_write_iter(iocb, from);
1028 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
1031 rc = filemap_fdatawrite(inode->i_mapping);
1033 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1037 cifs_put_writer(cinode);
1041 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1043 struct cifsFileInfo *cfile = file->private_data;
1044 struct cifs_tcon *tcon;
1047 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1048 * the cached file length
1050 if (whence != SEEK_SET && whence != SEEK_CUR) {
1052 struct inode *inode = file_inode(file);
1055 * We need to be sure that all dirty pages are written and the
1056 * server has the newest file length.
1058 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1059 inode->i_mapping->nrpages != 0) {
1060 rc = filemap_fdatawait(inode->i_mapping);
1062 mapping_set_error(inode->i_mapping, rc);
1067 * Some applications poll for the file length in this strange
1068 * way so we must seek to end on non-oplocked files by
1069 * setting the revalidate time to zero.
1071 CIFS_I(inode)->time = 0;
1073 rc = cifs_revalidate_file_attr(file);
1077 if (cfile && cfile->tlink) {
1078 tcon = tlink_tcon(cfile->tlink);
1079 if (tcon->ses->server->ops->llseek)
1080 return tcon->ses->server->ops->llseek(file, tcon,
1083 return generic_file_llseek(file, offset, whence);
1087 cifs_setlease(struct file *file, int arg, struct file_lock **lease, void **priv)
1090 * Note that this is called by vfs setlease with i_lock held to
1091 * protect *lease from going away.
1093 struct inode *inode = file_inode(file);
1094 struct cifsFileInfo *cfile = file->private_data;
1096 if (!(S_ISREG(inode->i_mode)))
1099 /* Check if file is oplocked if this is request for new lease */
1100 if (arg == F_UNLCK ||
1101 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1102 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1103 return generic_setlease(file, arg, lease, priv);
1104 else if (tlink_tcon(cfile->tlink)->local_lease &&
1105 !CIFS_CACHE_READ(CIFS_I(inode)))
1107 * If the server claims to support oplock on this file, then we
1108 * still need to check oplock even if the local_lease mount
1109 * option is set, but there are servers which do not support
1110 * oplock for which this mount option may be useful if the user
1111 * knows that the file won't be changed on the server by anyone
1114 return generic_setlease(file, arg, lease, priv);
1119 struct file_system_type cifs_fs_type = {
1120 .owner = THIS_MODULE,
1122 .init_fs_context = smb3_init_fs_context,
1123 .parameters = smb3_fs_parameters,
1124 .kill_sb = cifs_kill_sb,
1125 .fs_flags = FS_RENAME_DOES_D_MOVE,
1127 MODULE_ALIAS_FS("cifs");
1129 struct file_system_type smb3_fs_type = {
1130 .owner = THIS_MODULE,
1132 .init_fs_context = smb3_init_fs_context,
1133 .parameters = smb3_fs_parameters,
1134 .kill_sb = cifs_kill_sb,
1135 .fs_flags = FS_RENAME_DOES_D_MOVE,
1137 MODULE_ALIAS_FS("smb3");
1138 MODULE_ALIAS("smb3");
1140 const struct inode_operations cifs_dir_inode_ops = {
1141 .create = cifs_create,
1142 .atomic_open = cifs_atomic_open,
1143 .lookup = cifs_lookup,
1144 .getattr = cifs_getattr,
1145 .unlink = cifs_unlink,
1146 .link = cifs_hardlink,
1147 .mkdir = cifs_mkdir,
1148 .rmdir = cifs_rmdir,
1149 .rename = cifs_rename2,
1150 .permission = cifs_permission,
1151 .setattr = cifs_setattr,
1152 .symlink = cifs_symlink,
1153 .mknod = cifs_mknod,
1154 .listxattr = cifs_listxattr,
1155 .get_acl = cifs_get_acl,
1156 .set_acl = cifs_set_acl,
1159 const struct inode_operations cifs_file_inode_ops = {
1160 .setattr = cifs_setattr,
1161 .getattr = cifs_getattr,
1162 .permission = cifs_permission,
1163 .listxattr = cifs_listxattr,
1164 .fiemap = cifs_fiemap,
1165 .get_acl = cifs_get_acl,
1166 .set_acl = cifs_set_acl,
1169 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1170 struct delayed_call *done)
1174 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1176 return ERR_PTR(-ENOMEM);
1178 spin_lock(&inode->i_lock);
1179 if (likely(CIFS_I(inode)->symlink_target)) {
1180 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1183 target_path = ERR_PTR(-EOPNOTSUPP);
1185 spin_unlock(&inode->i_lock);
1187 if (!IS_ERR(target_path))
1188 set_delayed_call(done, kfree_link, target_path);
1193 const struct inode_operations cifs_symlink_inode_ops = {
1194 .get_link = cifs_get_link,
1195 .setattr = cifs_setattr,
1196 .permission = cifs_permission,
1197 .listxattr = cifs_listxattr,
1201 * Advance the EOF marker to after the source range.
1203 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1204 struct cifs_tcon *src_tcon,
1205 unsigned int xid, loff_t src_end)
1207 struct cifsFileInfo *writeable_srcfile;
1210 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1211 if (writeable_srcfile) {
1212 if (src_tcon->ses->server->ops->set_file_size)
1213 rc = src_tcon->ses->server->ops->set_file_size(
1214 xid, src_tcon, writeable_srcfile,
1215 src_inode->i_size, true /* no need to set sparse */);
1218 cifsFileInfo_put(writeable_srcfile);
1219 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1225 netfs_resize_file(&src_cifsi->netfs, src_end);
1226 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1230 return filemap_write_and_wait(src_inode->i_mapping);
1234 * Flush out either the folio that overlaps the beginning of a range in which
1235 * pos resides or the folio that overlaps the end of a range unless that folio
1236 * is entirely within the range we're going to invalidate. We extend the flush
1237 * bounds to encompass the folio.
1239 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1242 struct folio *folio;
1243 unsigned long long fpos, fend;
1244 pgoff_t index = pos / PAGE_SIZE;
1248 folio = filemap_get_folio(inode->i_mapping, index);
1252 size = folio_size(folio);
1253 fpos = folio_pos(folio);
1254 fend = fpos + size - 1;
1255 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1256 *_fend = max_t(unsigned long long, *_fend, fend);
1257 if ((first && pos == fpos) || (!first && pos == fend))
1260 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1266 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1267 struct file *dst_file, loff_t destoff, loff_t len,
1268 unsigned int remap_flags)
1270 struct inode *src_inode = file_inode(src_file);
1271 struct inode *target_inode = file_inode(dst_file);
1272 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1273 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1274 struct cifsFileInfo *smb_file_src = src_file->private_data;
1275 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1276 struct cifs_tcon *target_tcon, *src_tcon;
1277 unsigned long long destend, fstart, fend, new_size;
1281 if (remap_flags & REMAP_FILE_DEDUP)
1283 if (remap_flags & ~REMAP_FILE_ADVISORY)
1286 cifs_dbg(FYI, "clone range\n");
1290 if (!smb_file_src || !smb_file_target) {
1292 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1296 src_tcon = tlink_tcon(smb_file_src->tlink);
1297 target_tcon = tlink_tcon(smb_file_target->tlink);
1300 * Note: cifs case is easier than btrfs since server responsible for
1301 * checks for proper open modes and file type and if it wants
1302 * server could even support copy of range where source = target
1304 lock_two_nondirectories(target_inode, src_inode);
1307 len = src_inode->i_size - off;
1309 cifs_dbg(FYI, "clone range\n");
1311 /* Flush the source buffer */
1312 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1317 /* The server-side copy will fail if the source crosses the EOF marker.
1318 * Advance the EOF marker after the flush above to the end of the range
1319 * if it's short of that.
1321 if (src_cifsi->netfs.remote_i_size < off + len) {
1322 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1327 new_size = destoff + len;
1328 destend = destoff + len - 1;
1330 /* Flush the folios at either end of the destination range to prevent
1331 * accidental loss of dirty data outside of the range.
1336 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1339 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1343 /* Discard all the folios that overlap the destination region. */
1344 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1345 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1347 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1348 i_size_read(target_inode), 0);
1351 if (target_tcon->ses->server->ops->duplicate_extents) {
1352 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1353 smb_file_src, smb_file_target, off, len, destoff);
1354 if (rc == 0 && new_size > i_size_read(target_inode)) {
1355 truncate_setsize(target_inode, new_size);
1356 netfs_resize_file(&target_cifsi->netfs, new_size);
1357 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1362 /* force revalidate of size and timestamps of target file now
1363 that target is updated on the server */
1364 CIFS_I(target_inode)->time = 0;
1366 /* although unlocking in the reverse order from locking is not
1367 strictly necessary here it is a little cleaner to be consistent */
1368 unlock_two_nondirectories(src_inode, target_inode);
1371 return rc < 0 ? rc : len;
1374 ssize_t cifs_file_copychunk_range(unsigned int xid,
1375 struct file *src_file, loff_t off,
1376 struct file *dst_file, loff_t destoff,
1377 size_t len, unsigned int flags)
1379 struct inode *src_inode = file_inode(src_file);
1380 struct inode *target_inode = file_inode(dst_file);
1381 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1382 struct cifsFileInfo *smb_file_src;
1383 struct cifsFileInfo *smb_file_target;
1384 struct cifs_tcon *src_tcon;
1385 struct cifs_tcon *target_tcon;
1386 unsigned long long destend, fstart, fend;
1389 cifs_dbg(FYI, "copychunk range\n");
1391 if (!src_file->private_data || !dst_file->private_data) {
1393 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1398 smb_file_target = dst_file->private_data;
1399 smb_file_src = src_file->private_data;
1400 src_tcon = tlink_tcon(smb_file_src->tlink);
1401 target_tcon = tlink_tcon(smb_file_target->tlink);
1403 if (src_tcon->ses != target_tcon->ses) {
1404 cifs_dbg(VFS, "source and target of copy not on same server\n");
1409 if (!target_tcon->ses->server->ops->copychunk_range)
1413 * Note: cifs case is easier than btrfs since server responsible for
1414 * checks for proper open modes and file type and if it wants
1415 * server could even support copy of range where source = target
1417 lock_two_nondirectories(target_inode, src_inode);
1419 cifs_dbg(FYI, "about to flush pages\n");
1421 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1426 /* The server-side copy will fail if the source crosses the EOF marker.
1427 * Advance the EOF marker after the flush above to the end of the range
1428 * if it's short of that.
1430 if (src_cifsi->server_eof < off + len) {
1431 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1436 destend = destoff + len - 1;
1438 /* Flush the folios at either end of the destination range to prevent
1439 * accidental loss of dirty data outside of the range.
1444 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1447 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1451 /* Discard all the folios that overlap the destination region. */
1452 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1454 rc = file_modified(dst_file);
1456 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1457 smb_file_src, smb_file_target, off, len, destoff);
1458 if (rc > 0 && destoff + rc > i_size_read(target_inode))
1459 truncate_setsize(target_inode, destoff + rc);
1462 file_accessed(src_file);
1464 /* force revalidate of size and timestamps of target file now
1465 * that target is updated on the server
1467 CIFS_I(target_inode)->time = 0;
1470 /* although unlocking in the reverse order from locking is not
1471 * strictly necessary here it is a little cleaner to be consistent
1473 unlock_two_nondirectories(src_inode, target_inode);
1480 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1481 * is a dummy operation.
1483 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1485 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1491 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1492 struct file *dst_file, loff_t destoff,
1493 size_t len, unsigned int flags)
1495 unsigned int xid = get_xid();
1497 struct cifsFileInfo *cfile = dst_file->private_data;
1499 if (cfile->swapfile) {
1505 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1509 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1510 rc = splice_copy_file_range(src_file, off, dst_file,
1515 const struct file_operations cifs_file_ops = {
1516 .read_iter = cifs_loose_read_iter,
1517 .write_iter = cifs_file_write_iter,
1519 .release = cifs_close,
1521 .flock = cifs_flock,
1522 .fsync = cifs_fsync,
1523 .flush = cifs_flush,
1524 .mmap = cifs_file_mmap,
1525 .splice_read = filemap_splice_read,
1526 .splice_write = iter_file_splice_write,
1527 .llseek = cifs_llseek,
1528 .unlocked_ioctl = cifs_ioctl,
1529 .copy_file_range = cifs_copy_file_range,
1530 .remap_file_range = cifs_remap_file_range,
1531 .setlease = cifs_setlease,
1532 .fallocate = cifs_fallocate,
1535 const struct file_operations cifs_file_strict_ops = {
1536 .read_iter = cifs_strict_readv,
1537 .write_iter = cifs_strict_writev,
1539 .release = cifs_close,
1541 .flock = cifs_flock,
1542 .fsync = cifs_strict_fsync,
1543 .flush = cifs_flush,
1544 .mmap = cifs_file_strict_mmap,
1545 .splice_read = filemap_splice_read,
1546 .splice_write = iter_file_splice_write,
1547 .llseek = cifs_llseek,
1548 .unlocked_ioctl = cifs_ioctl,
1549 .copy_file_range = cifs_copy_file_range,
1550 .remap_file_range = cifs_remap_file_range,
1551 .setlease = cifs_setlease,
1552 .fallocate = cifs_fallocate,
1555 const struct file_operations cifs_file_direct_ops = {
1556 .read_iter = cifs_direct_readv,
1557 .write_iter = cifs_direct_writev,
1559 .release = cifs_close,
1561 .flock = cifs_flock,
1562 .fsync = cifs_fsync,
1563 .flush = cifs_flush,
1564 .mmap = cifs_file_mmap,
1565 .splice_read = copy_splice_read,
1566 .splice_write = iter_file_splice_write,
1567 .unlocked_ioctl = cifs_ioctl,
1568 .copy_file_range = cifs_copy_file_range,
1569 .remap_file_range = cifs_remap_file_range,
1570 .llseek = cifs_llseek,
1571 .setlease = cifs_setlease,
1572 .fallocate = cifs_fallocate,
1575 const struct file_operations cifs_file_nobrl_ops = {
1576 .read_iter = cifs_loose_read_iter,
1577 .write_iter = cifs_file_write_iter,
1579 .release = cifs_close,
1580 .fsync = cifs_fsync,
1581 .flush = cifs_flush,
1582 .mmap = cifs_file_mmap,
1583 .splice_read = filemap_splice_read,
1584 .splice_write = iter_file_splice_write,
1585 .llseek = cifs_llseek,
1586 .unlocked_ioctl = cifs_ioctl,
1587 .copy_file_range = cifs_copy_file_range,
1588 .remap_file_range = cifs_remap_file_range,
1589 .setlease = cifs_setlease,
1590 .fallocate = cifs_fallocate,
1593 const struct file_operations cifs_file_strict_nobrl_ops = {
1594 .read_iter = cifs_strict_readv,
1595 .write_iter = cifs_strict_writev,
1597 .release = cifs_close,
1598 .fsync = cifs_strict_fsync,
1599 .flush = cifs_flush,
1600 .mmap = cifs_file_strict_mmap,
1601 .splice_read = filemap_splice_read,
1602 .splice_write = iter_file_splice_write,
1603 .llseek = cifs_llseek,
1604 .unlocked_ioctl = cifs_ioctl,
1605 .copy_file_range = cifs_copy_file_range,
1606 .remap_file_range = cifs_remap_file_range,
1607 .setlease = cifs_setlease,
1608 .fallocate = cifs_fallocate,
1611 const struct file_operations cifs_file_direct_nobrl_ops = {
1612 .read_iter = cifs_direct_readv,
1613 .write_iter = cifs_direct_writev,
1615 .release = cifs_close,
1616 .fsync = cifs_fsync,
1617 .flush = cifs_flush,
1618 .mmap = cifs_file_mmap,
1619 .splice_read = copy_splice_read,
1620 .splice_write = iter_file_splice_write,
1621 .unlocked_ioctl = cifs_ioctl,
1622 .copy_file_range = cifs_copy_file_range,
1623 .remap_file_range = cifs_remap_file_range,
1624 .llseek = cifs_llseek,
1625 .setlease = cifs_setlease,
1626 .fallocate = cifs_fallocate,
1629 const struct file_operations cifs_dir_ops = {
1630 .iterate_shared = cifs_readdir,
1631 .release = cifs_closedir,
1632 .read = generic_read_dir,
1633 .unlocked_ioctl = cifs_ioctl,
1634 .copy_file_range = cifs_copy_file_range,
1635 .remap_file_range = cifs_remap_file_range,
1636 .llseek = generic_file_llseek,
1637 .fsync = cifs_dir_fsync,
1641 cifs_init_once(void *inode)
1643 struct cifsInodeInfo *cifsi = inode;
1645 inode_init_once(&cifsi->netfs.inode);
1646 init_rwsem(&cifsi->lock_sem);
1650 cifs_init_inodecache(void)
1652 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1653 sizeof(struct cifsInodeInfo),
1654 0, (SLAB_RECLAIM_ACCOUNT|
1655 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1657 if (cifs_inode_cachep == NULL)
1664 cifs_destroy_inodecache(void)
1667 * Make sure all delayed rcu free inodes are flushed before we
1671 kmem_cache_destroy(cifs_inode_cachep);
1675 cifs_init_request_bufs(void)
1678 * SMB2 maximum header size is bigger than CIFS one - no problems to
1679 * allocate some more bytes for CIFS.
1681 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1683 if (CIFSMaxBufSize < 8192) {
1684 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1685 Unicode path name has to fit in any SMB/CIFS path based frames */
1686 CIFSMaxBufSize = 8192;
1687 } else if (CIFSMaxBufSize > 1024*127) {
1688 CIFSMaxBufSize = 1024 * 127;
1690 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1693 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1694 CIFSMaxBufSize, CIFSMaxBufSize);
1696 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1697 CIFSMaxBufSize + max_hdr_size, 0,
1698 SLAB_HWCACHE_ALIGN, 0,
1699 CIFSMaxBufSize + max_hdr_size,
1701 if (cifs_req_cachep == NULL)
1704 if (cifs_min_rcv < 1)
1706 else if (cifs_min_rcv > 64) {
1708 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1711 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1714 if (cifs_req_poolp == NULL) {
1715 kmem_cache_destroy(cifs_req_cachep);
1718 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1719 almost all handle based requests (but not write response, nor is it
1720 sufficient for path based requests). A smaller size would have
1721 been more efficient (compacting multiple slab items on one 4k page)
1722 for the case in which debug was on, but this larger size allows
1723 more SMBs to use small buffer alloc and is still much more
1724 efficient to alloc 1 per page off the slab compared to 17K (5page)
1725 alloc of large cifs buffers even when page debugging is on */
1726 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1727 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1728 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1729 if (cifs_sm_req_cachep == NULL) {
1730 mempool_destroy(cifs_req_poolp);
1731 kmem_cache_destroy(cifs_req_cachep);
1735 if (cifs_min_small < 2)
1737 else if (cifs_min_small > 256) {
1738 cifs_min_small = 256;
1739 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1742 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1743 cifs_sm_req_cachep);
1745 if (cifs_sm_req_poolp == NULL) {
1746 mempool_destroy(cifs_req_poolp);
1747 kmem_cache_destroy(cifs_req_cachep);
1748 kmem_cache_destroy(cifs_sm_req_cachep);
1756 cifs_destroy_request_bufs(void)
1758 mempool_destroy(cifs_req_poolp);
1759 kmem_cache_destroy(cifs_req_cachep);
1760 mempool_destroy(cifs_sm_req_poolp);
1761 kmem_cache_destroy(cifs_sm_req_cachep);
1764 static int init_mids(void)
1766 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1767 sizeof(struct mid_q_entry), 0,
1768 SLAB_HWCACHE_ALIGN, NULL);
1769 if (cifs_mid_cachep == NULL)
1772 /* 3 is a reasonable minimum number of simultaneous operations */
1773 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1774 if (cifs_mid_poolp == NULL) {
1775 kmem_cache_destroy(cifs_mid_cachep);
1782 static void destroy_mids(void)
1784 mempool_destroy(cifs_mid_poolp);
1785 kmem_cache_destroy(cifs_mid_cachep);
1793 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1795 * Initialize Global counters
1797 atomic_set(&sesInfoAllocCount, 0);
1798 atomic_set(&tconInfoAllocCount, 0);
1799 atomic_set(&tcpSesNextId, 0);
1800 atomic_set(&tcpSesAllocCount, 0);
1801 atomic_set(&tcpSesReconnectCount, 0);
1802 atomic_set(&tconInfoReconnectCount, 0);
1804 atomic_set(&buf_alloc_count, 0);
1805 atomic_set(&small_buf_alloc_count, 0);
1806 #ifdef CONFIG_CIFS_STATS2
1807 atomic_set(&total_buf_alloc_count, 0);
1808 atomic_set(&total_small_buf_alloc_count, 0);
1809 if (slow_rsp_threshold < 1)
1810 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1811 else if (slow_rsp_threshold > 32767)
1813 "slow response threshold set higher than recommended (0 to 32767)\n");
1814 #endif /* CONFIG_CIFS_STATS2 */
1816 atomic_set(&mid_count, 0);
1817 GlobalCurrentXid = 0;
1818 GlobalTotalActiveXid = 0;
1819 GlobalMaxActiveXid = 0;
1820 spin_lock_init(&cifs_tcp_ses_lock);
1821 spin_lock_init(&GlobalMid_Lock);
1823 cifs_lock_secret = get_random_u32();
1825 if (cifs_max_pending < 2) {
1826 cifs_max_pending = 2;
1827 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1828 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1829 cifs_max_pending = CIFS_MAX_REQ;
1830 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1834 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1835 if (dir_cache_timeout > 65000) {
1836 dir_cache_timeout = 65000;
1837 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1840 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1843 goto out_clean_proc;
1847 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1848 * so that we don't launch too many worker threads but
1849 * Documentation/core-api/workqueue.rst recommends setting it to 0
1852 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1853 decrypt_wq = alloc_workqueue("smb3decryptd",
1854 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1857 goto out_destroy_cifsiod_wq;
1860 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1861 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1862 if (!fileinfo_put_wq) {
1864 goto out_destroy_decrypt_wq;
1867 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1868 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1869 if (!cifsoplockd_wq) {
1871 goto out_destroy_fileinfo_put_wq;
1874 deferredclose_wq = alloc_workqueue("deferredclose",
1875 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1876 if (!deferredclose_wq) {
1878 goto out_destroy_cifsoplockd_wq;
1881 rc = cifs_init_inodecache();
1883 goto out_destroy_deferredclose_wq;
1887 goto out_destroy_inodecache;
1889 rc = cifs_init_request_bufs();
1891 goto out_destroy_mids;
1893 #ifdef CONFIG_CIFS_DFS_UPCALL
1894 rc = dfs_cache_init();
1896 goto out_destroy_request_bufs;
1897 #endif /* CONFIG_CIFS_DFS_UPCALL */
1898 #ifdef CONFIG_CIFS_UPCALL
1899 rc = init_cifs_spnego();
1901 goto out_destroy_dfs_cache;
1902 #endif /* CONFIG_CIFS_UPCALL */
1903 #ifdef CONFIG_CIFS_SWN_UPCALL
1904 rc = cifs_genl_init();
1906 goto out_register_key_type;
1907 #endif /* CONFIG_CIFS_SWN_UPCALL */
1909 rc = init_cifs_idmap();
1911 goto out_cifs_swn_init;
1913 rc = register_filesystem(&cifs_fs_type);
1915 goto out_init_cifs_idmap;
1917 rc = register_filesystem(&smb3_fs_type);
1919 unregister_filesystem(&cifs_fs_type);
1920 goto out_init_cifs_idmap;
1925 out_init_cifs_idmap:
1928 #ifdef CONFIG_CIFS_SWN_UPCALL
1930 out_register_key_type:
1932 #ifdef CONFIG_CIFS_UPCALL
1934 out_destroy_dfs_cache:
1936 #ifdef CONFIG_CIFS_DFS_UPCALL
1937 dfs_cache_destroy();
1938 out_destroy_request_bufs:
1940 cifs_destroy_request_bufs();
1943 out_destroy_inodecache:
1944 cifs_destroy_inodecache();
1945 out_destroy_deferredclose_wq:
1946 destroy_workqueue(deferredclose_wq);
1947 out_destroy_cifsoplockd_wq:
1948 destroy_workqueue(cifsoplockd_wq);
1949 out_destroy_fileinfo_put_wq:
1950 destroy_workqueue(fileinfo_put_wq);
1951 out_destroy_decrypt_wq:
1952 destroy_workqueue(decrypt_wq);
1953 out_destroy_cifsiod_wq:
1954 destroy_workqueue(cifsiod_wq);
1963 cifs_dbg(NOISY, "exit_smb3\n");
1964 unregister_filesystem(&cifs_fs_type);
1965 unregister_filesystem(&smb3_fs_type);
1966 cifs_release_automount_timer();
1968 #ifdef CONFIG_CIFS_SWN_UPCALL
1971 #ifdef CONFIG_CIFS_UPCALL
1974 #ifdef CONFIG_CIFS_DFS_UPCALL
1975 dfs_cache_destroy();
1977 cifs_destroy_request_bufs();
1979 cifs_destroy_inodecache();
1980 destroy_workqueue(deferredclose_wq);
1981 destroy_workqueue(cifsoplockd_wq);
1982 destroy_workqueue(decrypt_wq);
1983 destroy_workqueue(fileinfo_put_wq);
1984 destroy_workqueue(cifsiod_wq);
1988 MODULE_AUTHOR("Steve French");
1989 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1991 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1992 "also older servers complying with the SNIA CIFS Specification)");
1993 MODULE_VERSION(CIFS_VERSION);
1994 MODULE_SOFTDEP("ecb");
1995 MODULE_SOFTDEP("hmac");
1996 MODULE_SOFTDEP("md5");
1997 MODULE_SOFTDEP("nls");
1998 MODULE_SOFTDEP("aes");
1999 MODULE_SOFTDEP("cmac");
2000 MODULE_SOFTDEP("sha256");
2001 MODULE_SOFTDEP("sha512");
2002 MODULE_SOFTDEP("aead2");
2003 MODULE_SOFTDEP("ccm");
2004 MODULE_SOFTDEP("gcm");
2005 module_init(init_cifs)
2006 module_exit(exit_cifs)