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 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 __u32 cifs_lock_secret;
163 * Bumps refcount for cifs super block.
164 * Note that it should be only called if a referece to VFS super block is
165 * already held, e.g. in open-type syscalls context. Otherwise it can race with
166 * atomic_dec_and_test in deactivate_locked_super.
169 cifs_sb_active(struct super_block *sb)
171 struct cifs_sb_info *server = CIFS_SB(sb);
173 if (atomic_inc_return(&server->active) == 1)
174 atomic_inc(&sb->s_active);
178 cifs_sb_deactive(struct super_block *sb)
180 struct cifs_sb_info *server = CIFS_SB(sb);
182 if (atomic_dec_and_test(&server->active))
183 deactivate_super(sb);
187 cifs_read_super(struct super_block *sb)
190 struct cifs_sb_info *cifs_sb;
191 struct cifs_tcon *tcon;
192 struct timespec64 ts;
195 cifs_sb = CIFS_SB(sb);
196 tcon = cifs_sb_master_tcon(cifs_sb);
198 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
199 sb->s_flags |= SB_POSIXACL;
201 if (tcon->snapshot_time)
202 sb->s_flags |= SB_RDONLY;
204 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
205 sb->s_maxbytes = MAX_LFS_FILESIZE;
207 sb->s_maxbytes = MAX_NON_LFS;
210 * Some very old servers like DOS and OS/2 used 2 second granularity
211 * (while all current servers use 100ns granularity - see MS-DTYP)
212 * but 1 second is the maximum allowed granularity for the VFS
213 * so for old servers set time granularity to 1 second while for
214 * everything else (current servers) set it to 100ns.
216 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
217 ((tcon->ses->capabilities &
218 tcon->ses->server->vals->cap_nt_find) == 0) &&
220 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
221 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
222 sb->s_time_min = ts.tv_sec;
223 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
224 cpu_to_le16(SMB_TIME_MAX), 0);
225 sb->s_time_max = ts.tv_sec;
228 * Almost every server, including all SMB2+, uses DCE TIME
229 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
231 sb->s_time_gran = 100;
232 ts = cifs_NTtimeToUnix(0);
233 sb->s_time_min = ts.tv_sec;
234 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
235 sb->s_time_max = ts.tv_sec;
238 sb->s_magic = CIFS_SUPER_MAGIC;
239 sb->s_op = &cifs_super_ops;
240 sb->s_xattr = cifs_xattr_handlers;
241 rc = super_setup_bdi(sb);
244 /* tune readahead according to rsize if readahead size not set on mount */
245 if (cifs_sb->ctx->rsize == 0)
246 cifs_sb->ctx->rsize =
247 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
248 if (cifs_sb->ctx->rasize)
249 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
251 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
253 sb->s_blocksize = CIFS_MAX_MSGSIZE;
254 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
255 inode = cifs_root_iget(sb);
263 sb->s_d_op = &cifs_ci_dentry_ops;
265 sb->s_d_op = &cifs_dentry_ops;
267 sb->s_root = d_make_root(inode);
273 #ifdef CONFIG_CIFS_NFSD_EXPORT
274 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
275 cifs_dbg(FYI, "export ops supported\n");
276 sb->s_export_op = &cifs_export_ops;
278 #endif /* CONFIG_CIFS_NFSD_EXPORT */
283 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
287 static void cifs_kill_sb(struct super_block *sb)
289 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
292 * We ned to release all dentries for the cached directories
293 * before we kill the sb.
296 close_all_cached_dirs(cifs_sb);
298 /* finally release root dentry */
300 cifs_sb->root = NULL;
304 cifs_umount(cifs_sb);
308 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
310 struct super_block *sb = dentry->d_sb;
311 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
312 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
313 struct TCP_Server_Info *server = tcon->ses->server;
319 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
321 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
323 buf->f_namelen = PATH_MAX;
325 buf->f_fsid.val[0] = tcon->vol_serial_number;
326 /* are using part of create time for more randomness, see man statfs */
327 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
329 buf->f_files = 0; /* undefined */
330 buf->f_ffree = 0; /* unlimited */
332 if (server->ops->queryfs)
333 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
339 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
341 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
342 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
343 struct TCP_Server_Info *server = tcon->ses->server;
345 if (server->ops->fallocate)
346 return server->ops->fallocate(file, tcon, mode, off, len);
351 static int cifs_permission(struct mnt_idmap *idmap,
352 struct inode *inode, int mask)
354 struct cifs_sb_info *cifs_sb;
356 cifs_sb = CIFS_SB(inode->i_sb);
358 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
359 if ((mask & MAY_EXEC) && !execute_ok(inode))
363 } else /* file mode might have been restricted at mount time
364 on the client (above and beyond ACL on servers) for
365 servers which do not support setting and viewing mode bits,
366 so allowing client to check permissions is useful */
367 return generic_permission(&nop_mnt_idmap, inode, mask);
370 static struct kmem_cache *cifs_inode_cachep;
371 static struct kmem_cache *cifs_req_cachep;
372 static struct kmem_cache *cifs_mid_cachep;
373 static struct kmem_cache *cifs_sm_req_cachep;
374 mempool_t *cifs_sm_req_poolp;
375 mempool_t *cifs_req_poolp;
376 mempool_t *cifs_mid_poolp;
378 static struct inode *
379 cifs_alloc_inode(struct super_block *sb)
381 struct cifsInodeInfo *cifs_inode;
382 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
385 cifs_inode->cifsAttrs = 0x20; /* default */
386 cifs_inode->time = 0;
388 * Until the file is open and we have gotten oplock info back from the
389 * server, can not assume caching of file data or metadata.
391 cifs_set_oplock_level(cifs_inode, 0);
392 cifs_inode->flags = 0;
393 spin_lock_init(&cifs_inode->writers_lock);
394 cifs_inode->writers = 0;
395 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
396 cifs_inode->netfs.remote_i_size = 0;
397 cifs_inode->uniqueid = 0;
398 cifs_inode->createtime = 0;
399 cifs_inode->epoch = 0;
400 spin_lock_init(&cifs_inode->open_file_lock);
401 generate_random_uuid(cifs_inode->lease_key);
402 cifs_inode->symlink_target = NULL;
405 * Can not set i_flags here - they get immediately overwritten to zero
408 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
409 INIT_LIST_HEAD(&cifs_inode->openFileList);
410 INIT_LIST_HEAD(&cifs_inode->llist);
411 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
412 spin_lock_init(&cifs_inode->deferred_lock);
413 return &cifs_inode->netfs.inode;
417 cifs_free_inode(struct inode *inode)
419 struct cifsInodeInfo *cinode = CIFS_I(inode);
421 if (S_ISLNK(inode->i_mode))
422 kfree(cinode->symlink_target);
423 kmem_cache_free(cifs_inode_cachep, cinode);
427 cifs_evict_inode(struct inode *inode)
429 truncate_inode_pages_final(&inode->i_data);
430 if (inode->i_state & I_PINNING_NETFS_WB)
431 cifs_fscache_unuse_inode_cookie(inode, true);
432 cifs_fscache_release_inode_cookie(inode);
437 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
439 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
440 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
442 seq_puts(s, ",addr=");
444 switch (server->dstaddr.ss_family) {
446 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
449 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
450 if (sa6->sin6_scope_id)
451 seq_printf(s, "%%%u", sa6->sin6_scope_id);
454 seq_puts(s, "(unknown)");
457 seq_puts(s, ",rdma");
461 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
463 if (ses->sectype == Unspecified) {
464 if (ses->user_name == NULL)
465 seq_puts(s, ",sec=none");
469 seq_puts(s, ",sec=");
471 switch (ses->sectype) {
473 seq_puts(s, "ntlmv2");
479 seq_puts(s, "ntlmssp");
482 /* shouldn't ever happen */
483 seq_puts(s, "unknown");
490 if (ses->sectype == Kerberos)
491 seq_printf(s, ",cruid=%u",
492 from_kuid_munged(&init_user_ns, ses->cred_uid));
496 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
498 seq_puts(s, ",cache=");
500 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
501 seq_puts(s, "strict");
502 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
504 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
505 seq_puts(s, "singleclient"); /* assume only one client access */
506 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
507 seq_puts(s, "ro"); /* read only caching assumed */
509 seq_puts(s, "loose");
513 * cifs_show_devname() is used so we show the mount device name with correct
514 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
516 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
518 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
519 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
524 convert_delimiter(devname, '/');
525 /* escape all spaces in share names */
526 seq_escape(m, devname, " \t");
533 * cifs_show_options() is for displaying mount options in /proc/mounts.
534 * Not all settable options are displayed but most of the important
538 cifs_show_options(struct seq_file *s, struct dentry *root)
540 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
541 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
542 struct sockaddr *srcaddr;
543 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
545 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
546 cifs_show_security(s, tcon->ses);
547 cifs_show_cache_flavor(s, cifs_sb);
550 seq_puts(s, ",nolease");
551 if (cifs_sb->ctx->multiuser)
552 seq_puts(s, ",multiuser");
553 else if (tcon->ses->user_name)
554 seq_show_option(s, "username", tcon->ses->user_name);
556 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
557 seq_show_option(s, "domain", tcon->ses->domainName);
559 if (srcaddr->sa_family != AF_UNSPEC) {
560 struct sockaddr_in *saddr4;
561 struct sockaddr_in6 *saddr6;
562 saddr4 = (struct sockaddr_in *)srcaddr;
563 saddr6 = (struct sockaddr_in6 *)srcaddr;
564 if (srcaddr->sa_family == AF_INET6)
565 seq_printf(s, ",srcaddr=%pI6c",
567 else if (srcaddr->sa_family == AF_INET)
568 seq_printf(s, ",srcaddr=%pI4",
569 &saddr4->sin_addr.s_addr);
571 seq_printf(s, ",srcaddr=BAD-AF:%i",
572 (int)(srcaddr->sa_family));
575 seq_printf(s, ",uid=%u",
576 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
578 seq_puts(s, ",forceuid");
580 seq_puts(s, ",noforceuid");
582 seq_printf(s, ",gid=%u",
583 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
585 seq_puts(s, ",forcegid");
587 seq_puts(s, ",noforcegid");
589 cifs_show_address(s, tcon->ses->server);
592 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
593 cifs_sb->ctx->file_mode,
594 cifs_sb->ctx->dir_mode);
595 if (cifs_sb->ctx->iocharset)
596 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
598 seq_puts(s, ",seal");
599 else if (tcon->ses->server->ignore_signature)
600 seq_puts(s, ",signloosely");
602 seq_puts(s, ",nocase");
604 seq_puts(s, ",nodelete");
605 if (cifs_sb->ctx->no_sparse)
606 seq_puts(s, ",nosparse");
607 if (tcon->local_lease)
608 seq_puts(s, ",locallease");
610 seq_puts(s, ",hard");
612 seq_puts(s, ",soft");
613 if (tcon->use_persistent)
614 seq_puts(s, ",persistenthandles");
615 else if (tcon->use_resilient)
616 seq_puts(s, ",resilienthandles");
617 if (tcon->posix_extensions)
618 seq_puts(s, ",posix");
619 else if (tcon->unix_ext)
620 seq_puts(s, ",unix");
622 seq_puts(s, ",nounix");
623 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
624 seq_puts(s, ",nodfs");
625 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
626 seq_puts(s, ",posixpaths");
627 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
628 seq_puts(s, ",setuids");
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
630 seq_puts(s, ",idsfromsid");
631 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
632 seq_puts(s, ",serverino");
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
634 seq_puts(s, ",rwpidforward");
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
636 seq_puts(s, ",forcemand");
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
638 seq_puts(s, ",nouser_xattr");
639 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
640 seq_puts(s, ",mapchars");
641 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
642 seq_puts(s, ",mapposix");
643 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
645 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
646 seq_puts(s, ",nobrl");
647 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
648 seq_puts(s, ",nohandlecache");
649 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
650 seq_puts(s, ",modefromsid");
651 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
652 seq_puts(s, ",cifsacl");
653 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
654 seq_puts(s, ",dynperm");
655 if (root->d_sb->s_flags & SB_POSIXACL)
657 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
658 seq_puts(s, ",mfsymlinks");
659 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
661 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
662 seq_puts(s, ",nostrictsync");
663 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
664 seq_puts(s, ",noperm");
665 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
666 seq_printf(s, ",backupuid=%u",
667 from_kuid_munged(&init_user_ns,
668 cifs_sb->ctx->backupuid));
669 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
670 seq_printf(s, ",backupgid=%u",
671 from_kgid_munged(&init_user_ns,
672 cifs_sb->ctx->backupgid));
673 seq_show_option(s, "reparse",
674 cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
676 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
677 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
678 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
679 if (cifs_sb->ctx->rasize)
680 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
681 if (tcon->ses->server->min_offload)
682 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
683 if (tcon->ses->server->retrans)
684 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans);
685 seq_printf(s, ",echo_interval=%lu",
686 tcon->ses->server->echo_interval / HZ);
688 /* Only display the following if overridden on mount */
689 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
690 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
691 if (tcon->ses->server->tcp_nodelay)
692 seq_puts(s, ",tcpnodelay");
693 if (tcon->ses->server->noautotune)
694 seq_puts(s, ",noautotune");
695 if (tcon->ses->server->noblocksnd)
696 seq_puts(s, ",noblocksend");
697 if (tcon->ses->server->nosharesock)
698 seq_puts(s, ",nosharesock");
700 if (tcon->snapshot_time)
701 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
702 if (tcon->handle_timeout)
703 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
704 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
705 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
708 * Display file and directory attribute timeout in seconds.
709 * If file and directory attribute timeout the same then actimeo
710 * was likely specified on mount
712 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
713 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
715 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
716 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
718 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
720 if (tcon->ses->chan_max > 1)
721 seq_printf(s, ",multichannel,max_channels=%zu",
722 tcon->ses->chan_max);
724 if (tcon->use_witness)
725 seq_puts(s, ",witness");
730 static void cifs_umount_begin(struct super_block *sb)
732 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
733 struct cifs_tcon *tcon;
738 tcon = cifs_sb_master_tcon(cifs_sb);
740 spin_lock(&cifs_tcp_ses_lock);
741 spin_lock(&tcon->tc_lock);
742 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
743 /* we have other mounts to same share or we have
744 already tried to umount this and woken up
745 all waiting network requests, nothing to do */
746 spin_unlock(&tcon->tc_lock);
747 spin_unlock(&cifs_tcp_ses_lock);
751 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
752 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
754 spin_unlock(&tcon->tc_lock);
755 spin_unlock(&cifs_tcp_ses_lock);
757 cifs_close_all_deferred_files(tcon);
758 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
759 /* cancel_notify_requests(tcon); */
760 if (tcon->ses && tcon->ses->server) {
761 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
762 wake_up_all(&tcon->ses->server->request_q);
763 wake_up_all(&tcon->ses->server->response_q);
764 msleep(1); /* yield */
765 /* we have to kick the requests once more */
766 wake_up_all(&tcon->ses->server->response_q);
773 static int cifs_freeze(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 cifs_close_all_deferred_files(tcon);
787 #ifdef CONFIG_CIFS_STATS2
788 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
795 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
797 return netfs_unpin_writeback(inode, wbc);
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_lease **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 /* Check if file is oplocked if this is request for new lease */
1097 if (arg == F_UNLCK ||
1098 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1099 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1100 return generic_setlease(file, arg, lease, priv);
1101 else if (tlink_tcon(cfile->tlink)->local_lease &&
1102 !CIFS_CACHE_READ(CIFS_I(inode)))
1104 * If the server claims to support oplock on this file, then we
1105 * still need to check oplock even if the local_lease mount
1106 * option is set, but there are servers which do not support
1107 * oplock for which this mount option may be useful if the user
1108 * knows that the file won't be changed on the server by anyone
1111 return generic_setlease(file, arg, lease, priv);
1116 struct file_system_type cifs_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("cifs");
1126 struct file_system_type smb3_fs_type = {
1127 .owner = THIS_MODULE,
1129 .init_fs_context = smb3_init_fs_context,
1130 .parameters = smb3_fs_parameters,
1131 .kill_sb = cifs_kill_sb,
1132 .fs_flags = FS_RENAME_DOES_D_MOVE,
1134 MODULE_ALIAS_FS("smb3");
1135 MODULE_ALIAS("smb3");
1137 const struct inode_operations cifs_dir_inode_ops = {
1138 .create = cifs_create,
1139 .atomic_open = cifs_atomic_open,
1140 .lookup = cifs_lookup,
1141 .getattr = cifs_getattr,
1142 .unlink = cifs_unlink,
1143 .link = cifs_hardlink,
1144 .mkdir = cifs_mkdir,
1145 .rmdir = cifs_rmdir,
1146 .rename = cifs_rename2,
1147 .permission = cifs_permission,
1148 .setattr = cifs_setattr,
1149 .symlink = cifs_symlink,
1150 .mknod = cifs_mknod,
1151 .listxattr = cifs_listxattr,
1152 .get_acl = cifs_get_acl,
1153 .set_acl = cifs_set_acl,
1156 const struct inode_operations cifs_file_inode_ops = {
1157 .setattr = cifs_setattr,
1158 .getattr = cifs_getattr,
1159 .permission = cifs_permission,
1160 .listxattr = cifs_listxattr,
1161 .fiemap = cifs_fiemap,
1162 .get_acl = cifs_get_acl,
1163 .set_acl = cifs_set_acl,
1166 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1167 struct delayed_call *done)
1172 return ERR_PTR(-ECHILD);
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, true);
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, true);
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 cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1383 struct cifsFileInfo *smb_file_src;
1384 struct cifsFileInfo *smb_file_target;
1385 struct cifs_tcon *src_tcon;
1386 struct cifs_tcon *target_tcon;
1387 unsigned long long destend, fstart, fend;
1390 cifs_dbg(FYI, "copychunk range\n");
1392 if (!src_file->private_data || !dst_file->private_data) {
1394 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1399 smb_file_target = dst_file->private_data;
1400 smb_file_src = src_file->private_data;
1401 src_tcon = tlink_tcon(smb_file_src->tlink);
1402 target_tcon = tlink_tcon(smb_file_target->tlink);
1404 if (src_tcon->ses != target_tcon->ses) {
1405 cifs_dbg(VFS, "source and target of copy not on same server\n");
1410 if (!target_tcon->ses->server->ops->copychunk_range)
1414 * Note: cifs case is easier than btrfs since server responsible for
1415 * checks for proper open modes and file type and if it wants
1416 * server could even support copy of range where source = target
1418 lock_two_nondirectories(target_inode, src_inode);
1420 cifs_dbg(FYI, "about to flush pages\n");
1422 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1427 /* The server-side copy will fail if the source crosses the EOF marker.
1428 * Advance the EOF marker after the flush above to the end of the range
1429 * if it's short of that.
1431 if (src_cifsi->netfs.remote_i_size < off + len) {
1432 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1437 destend = destoff + len - 1;
1439 /* Flush the folios at either end of the destination range to prevent
1440 * accidental loss of dirty data outside of the range.
1445 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1448 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1452 /* Discard all the folios that overlap the destination region. */
1453 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1455 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1456 i_size_read(target_inode), 0);
1458 rc = file_modified(dst_file);
1460 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1461 smb_file_src, smb_file_target, off, len, destoff);
1462 if (rc > 0 && destoff + rc > i_size_read(target_inode)) {
1463 truncate_setsize(target_inode, destoff + rc);
1464 netfs_resize_file(&target_cifsi->netfs,
1465 i_size_read(target_inode), true);
1466 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1467 i_size_read(target_inode));
1469 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point)
1470 target_cifsi->netfs.zero_point = destoff + rc;
1473 file_accessed(src_file);
1475 /* force revalidate of size and timestamps of target file now
1476 * that target is updated on the server
1478 CIFS_I(target_inode)->time = 0;
1481 /* although unlocking in the reverse order from locking is not
1482 * strictly necessary here it is a little cleaner to be consistent
1484 unlock_two_nondirectories(src_inode, target_inode);
1491 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1492 * is a dummy operation.
1494 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1496 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1502 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1503 struct file *dst_file, loff_t destoff,
1504 size_t len, unsigned int flags)
1506 unsigned int xid = get_xid();
1508 struct cifsFileInfo *cfile = dst_file->private_data;
1510 if (cfile->swapfile) {
1516 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1520 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1521 rc = splice_copy_file_range(src_file, off, dst_file,
1526 const struct file_operations cifs_file_ops = {
1527 .read_iter = cifs_loose_read_iter,
1528 .write_iter = cifs_file_write_iter,
1530 .release = cifs_close,
1532 .flock = cifs_flock,
1533 .fsync = cifs_fsync,
1534 .flush = cifs_flush,
1535 .mmap = cifs_file_mmap,
1536 .splice_read = filemap_splice_read,
1537 .splice_write = iter_file_splice_write,
1538 .llseek = cifs_llseek,
1539 .unlocked_ioctl = cifs_ioctl,
1540 .copy_file_range = cifs_copy_file_range,
1541 .remap_file_range = cifs_remap_file_range,
1542 .setlease = cifs_setlease,
1543 .fallocate = cifs_fallocate,
1546 const struct file_operations cifs_file_strict_ops = {
1547 .read_iter = cifs_strict_readv,
1548 .write_iter = cifs_strict_writev,
1550 .release = cifs_close,
1552 .flock = cifs_flock,
1553 .fsync = cifs_strict_fsync,
1554 .flush = cifs_flush,
1555 .mmap = cifs_file_strict_mmap,
1556 .splice_read = filemap_splice_read,
1557 .splice_write = iter_file_splice_write,
1558 .llseek = cifs_llseek,
1559 .unlocked_ioctl = cifs_ioctl,
1560 .copy_file_range = cifs_copy_file_range,
1561 .remap_file_range = cifs_remap_file_range,
1562 .setlease = cifs_setlease,
1563 .fallocate = cifs_fallocate,
1566 const struct file_operations cifs_file_direct_ops = {
1567 .read_iter = cifs_direct_readv,
1568 .write_iter = cifs_direct_writev,
1570 .release = cifs_close,
1572 .flock = cifs_flock,
1573 .fsync = cifs_fsync,
1574 .flush = cifs_flush,
1575 .mmap = cifs_file_mmap,
1576 .splice_read = copy_splice_read,
1577 .splice_write = iter_file_splice_write,
1578 .unlocked_ioctl = cifs_ioctl,
1579 .copy_file_range = cifs_copy_file_range,
1580 .remap_file_range = cifs_remap_file_range,
1581 .llseek = cifs_llseek,
1582 .setlease = cifs_setlease,
1583 .fallocate = cifs_fallocate,
1586 const struct file_operations cifs_file_nobrl_ops = {
1587 .read_iter = cifs_loose_read_iter,
1588 .write_iter = cifs_file_write_iter,
1590 .release = cifs_close,
1591 .fsync = cifs_fsync,
1592 .flush = cifs_flush,
1593 .mmap = cifs_file_mmap,
1594 .splice_read = filemap_splice_read,
1595 .splice_write = iter_file_splice_write,
1596 .llseek = cifs_llseek,
1597 .unlocked_ioctl = cifs_ioctl,
1598 .copy_file_range = cifs_copy_file_range,
1599 .remap_file_range = cifs_remap_file_range,
1600 .setlease = cifs_setlease,
1601 .fallocate = cifs_fallocate,
1604 const struct file_operations cifs_file_strict_nobrl_ops = {
1605 .read_iter = cifs_strict_readv,
1606 .write_iter = cifs_strict_writev,
1608 .release = cifs_close,
1609 .fsync = cifs_strict_fsync,
1610 .flush = cifs_flush,
1611 .mmap = cifs_file_strict_mmap,
1612 .splice_read = filemap_splice_read,
1613 .splice_write = iter_file_splice_write,
1614 .llseek = cifs_llseek,
1615 .unlocked_ioctl = cifs_ioctl,
1616 .copy_file_range = cifs_copy_file_range,
1617 .remap_file_range = cifs_remap_file_range,
1618 .setlease = cifs_setlease,
1619 .fallocate = cifs_fallocate,
1622 const struct file_operations cifs_file_direct_nobrl_ops = {
1623 .read_iter = cifs_direct_readv,
1624 .write_iter = cifs_direct_writev,
1626 .release = cifs_close,
1627 .fsync = cifs_fsync,
1628 .flush = cifs_flush,
1629 .mmap = cifs_file_mmap,
1630 .splice_read = copy_splice_read,
1631 .splice_write = iter_file_splice_write,
1632 .unlocked_ioctl = cifs_ioctl,
1633 .copy_file_range = cifs_copy_file_range,
1634 .remap_file_range = cifs_remap_file_range,
1635 .llseek = cifs_llseek,
1636 .setlease = cifs_setlease,
1637 .fallocate = cifs_fallocate,
1640 const struct file_operations cifs_dir_ops = {
1641 .iterate_shared = cifs_readdir,
1642 .release = cifs_closedir,
1643 .read = generic_read_dir,
1644 .unlocked_ioctl = cifs_ioctl,
1645 .copy_file_range = cifs_copy_file_range,
1646 .remap_file_range = cifs_remap_file_range,
1647 .llseek = generic_file_llseek,
1648 .fsync = cifs_dir_fsync,
1652 cifs_init_once(void *inode)
1654 struct cifsInodeInfo *cifsi = inode;
1656 inode_init_once(&cifsi->netfs.inode);
1657 init_rwsem(&cifsi->lock_sem);
1661 cifs_init_inodecache(void)
1663 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1664 sizeof(struct cifsInodeInfo),
1665 0, (SLAB_RECLAIM_ACCOUNT|
1668 if (cifs_inode_cachep == NULL)
1675 cifs_destroy_inodecache(void)
1678 * Make sure all delayed rcu free inodes are flushed before we
1682 kmem_cache_destroy(cifs_inode_cachep);
1686 cifs_init_request_bufs(void)
1689 * SMB2 maximum header size is bigger than CIFS one - no problems to
1690 * allocate some more bytes for CIFS.
1692 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1694 if (CIFSMaxBufSize < 8192) {
1695 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1696 Unicode path name has to fit in any SMB/CIFS path based frames */
1697 CIFSMaxBufSize = 8192;
1698 } else if (CIFSMaxBufSize > 1024*127) {
1699 CIFSMaxBufSize = 1024 * 127;
1701 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1704 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1705 CIFSMaxBufSize, CIFSMaxBufSize);
1707 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1708 CIFSMaxBufSize + max_hdr_size, 0,
1709 SLAB_HWCACHE_ALIGN, 0,
1710 CIFSMaxBufSize + max_hdr_size,
1712 if (cifs_req_cachep == NULL)
1715 if (cifs_min_rcv < 1)
1717 else if (cifs_min_rcv > 64) {
1719 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1722 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1725 if (cifs_req_poolp == NULL) {
1726 kmem_cache_destroy(cifs_req_cachep);
1729 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1730 almost all handle based requests (but not write response, nor is it
1731 sufficient for path based requests). A smaller size would have
1732 been more efficient (compacting multiple slab items on one 4k page)
1733 for the case in which debug was on, but this larger size allows
1734 more SMBs to use small buffer alloc and is still much more
1735 efficient to alloc 1 per page off the slab compared to 17K (5page)
1736 alloc of large cifs buffers even when page debugging is on */
1737 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1738 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1739 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1740 if (cifs_sm_req_cachep == NULL) {
1741 mempool_destroy(cifs_req_poolp);
1742 kmem_cache_destroy(cifs_req_cachep);
1746 if (cifs_min_small < 2)
1748 else if (cifs_min_small > 256) {
1749 cifs_min_small = 256;
1750 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1753 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1754 cifs_sm_req_cachep);
1756 if (cifs_sm_req_poolp == NULL) {
1757 mempool_destroy(cifs_req_poolp);
1758 kmem_cache_destroy(cifs_req_cachep);
1759 kmem_cache_destroy(cifs_sm_req_cachep);
1767 cifs_destroy_request_bufs(void)
1769 mempool_destroy(cifs_req_poolp);
1770 kmem_cache_destroy(cifs_req_cachep);
1771 mempool_destroy(cifs_sm_req_poolp);
1772 kmem_cache_destroy(cifs_sm_req_cachep);
1775 static int init_mids(void)
1777 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1778 sizeof(struct mid_q_entry), 0,
1779 SLAB_HWCACHE_ALIGN, NULL);
1780 if (cifs_mid_cachep == NULL)
1783 /* 3 is a reasonable minimum number of simultaneous operations */
1784 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1785 if (cifs_mid_poolp == NULL) {
1786 kmem_cache_destroy(cifs_mid_cachep);
1793 static void destroy_mids(void)
1795 mempool_destroy(cifs_mid_poolp);
1796 kmem_cache_destroy(cifs_mid_cachep);
1804 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1806 * Initialize Global counters
1808 atomic_set(&sesInfoAllocCount, 0);
1809 atomic_set(&tconInfoAllocCount, 0);
1810 atomic_set(&tcpSesNextId, 0);
1811 atomic_set(&tcpSesAllocCount, 0);
1812 atomic_set(&tcpSesReconnectCount, 0);
1813 atomic_set(&tconInfoReconnectCount, 0);
1815 atomic_set(&buf_alloc_count, 0);
1816 atomic_set(&small_buf_alloc_count, 0);
1817 #ifdef CONFIG_CIFS_STATS2
1818 atomic_set(&total_buf_alloc_count, 0);
1819 atomic_set(&total_small_buf_alloc_count, 0);
1820 if (slow_rsp_threshold < 1)
1821 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1822 else if (slow_rsp_threshold > 32767)
1824 "slow response threshold set higher than recommended (0 to 32767)\n");
1825 #endif /* CONFIG_CIFS_STATS2 */
1827 atomic_set(&mid_count, 0);
1828 GlobalCurrentXid = 0;
1829 GlobalTotalActiveXid = 0;
1830 GlobalMaxActiveXid = 0;
1831 spin_lock_init(&cifs_tcp_ses_lock);
1832 spin_lock_init(&GlobalMid_Lock);
1834 cifs_lock_secret = get_random_u32();
1836 if (cifs_max_pending < 2) {
1837 cifs_max_pending = 2;
1838 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1839 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1840 cifs_max_pending = CIFS_MAX_REQ;
1841 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1845 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1846 if (dir_cache_timeout > 65000) {
1847 dir_cache_timeout = 65000;
1848 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1851 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1854 goto out_clean_proc;
1858 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1859 * so that we don't launch too many worker threads but
1860 * Documentation/core-api/workqueue.rst recommends setting it to 0
1863 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1864 decrypt_wq = alloc_workqueue("smb3decryptd",
1865 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1868 goto out_destroy_cifsiod_wq;
1871 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1872 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1873 if (!fileinfo_put_wq) {
1875 goto out_destroy_decrypt_wq;
1878 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1879 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1880 if (!cifsoplockd_wq) {
1882 goto out_destroy_fileinfo_put_wq;
1885 deferredclose_wq = alloc_workqueue("deferredclose",
1886 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1887 if (!deferredclose_wq) {
1889 goto out_destroy_cifsoplockd_wq;
1892 serverclose_wq = alloc_workqueue("serverclose",
1893 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1894 if (!serverclose_wq) {
1896 goto out_destroy_serverclose_wq;
1899 rc = cifs_init_inodecache();
1901 goto out_destroy_deferredclose_wq;
1905 goto out_destroy_inodecache;
1907 rc = cifs_init_request_bufs();
1909 goto out_destroy_mids;
1911 #ifdef CONFIG_CIFS_DFS_UPCALL
1912 rc = dfs_cache_init();
1914 goto out_destroy_request_bufs;
1915 #endif /* CONFIG_CIFS_DFS_UPCALL */
1916 #ifdef CONFIG_CIFS_UPCALL
1917 rc = init_cifs_spnego();
1919 goto out_destroy_dfs_cache;
1920 #endif /* CONFIG_CIFS_UPCALL */
1921 #ifdef CONFIG_CIFS_SWN_UPCALL
1922 rc = cifs_genl_init();
1924 goto out_register_key_type;
1925 #endif /* CONFIG_CIFS_SWN_UPCALL */
1927 rc = init_cifs_idmap();
1929 goto out_cifs_swn_init;
1931 rc = register_filesystem(&cifs_fs_type);
1933 goto out_init_cifs_idmap;
1935 rc = register_filesystem(&smb3_fs_type);
1937 unregister_filesystem(&cifs_fs_type);
1938 goto out_init_cifs_idmap;
1943 out_init_cifs_idmap:
1946 #ifdef CONFIG_CIFS_SWN_UPCALL
1948 out_register_key_type:
1950 #ifdef CONFIG_CIFS_UPCALL
1952 out_destroy_dfs_cache:
1954 #ifdef CONFIG_CIFS_DFS_UPCALL
1955 dfs_cache_destroy();
1956 out_destroy_request_bufs:
1958 cifs_destroy_request_bufs();
1961 out_destroy_inodecache:
1962 cifs_destroy_inodecache();
1963 out_destroy_deferredclose_wq:
1964 destroy_workqueue(deferredclose_wq);
1965 out_destroy_cifsoplockd_wq:
1966 destroy_workqueue(cifsoplockd_wq);
1967 out_destroy_fileinfo_put_wq:
1968 destroy_workqueue(fileinfo_put_wq);
1969 out_destroy_decrypt_wq:
1970 destroy_workqueue(decrypt_wq);
1971 out_destroy_cifsiod_wq:
1972 destroy_workqueue(cifsiod_wq);
1973 out_destroy_serverclose_wq:
1974 destroy_workqueue(serverclose_wq);
1983 cifs_dbg(NOISY, "exit_smb3\n");
1984 unregister_filesystem(&cifs_fs_type);
1985 unregister_filesystem(&smb3_fs_type);
1986 cifs_release_automount_timer();
1988 #ifdef CONFIG_CIFS_SWN_UPCALL
1991 #ifdef CONFIG_CIFS_UPCALL
1994 #ifdef CONFIG_CIFS_DFS_UPCALL
1995 dfs_cache_destroy();
1997 cifs_destroy_request_bufs();
1999 cifs_destroy_inodecache();
2000 destroy_workqueue(deferredclose_wq);
2001 destroy_workqueue(cifsoplockd_wq);
2002 destroy_workqueue(decrypt_wq);
2003 destroy_workqueue(fileinfo_put_wq);
2004 destroy_workqueue(serverclose_wq);
2005 destroy_workqueue(cifsiod_wq);
2009 MODULE_AUTHOR("Steve French");
2010 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2012 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2013 "also older servers complying with the SNIA CIFS Specification)");
2014 MODULE_VERSION(CIFS_VERSION);
2015 MODULE_SOFTDEP("ecb");
2016 MODULE_SOFTDEP("hmac");
2017 MODULE_SOFTDEP("md5");
2018 MODULE_SOFTDEP("nls");
2019 MODULE_SOFTDEP("aes");
2020 MODULE_SOFTDEP("cmac");
2021 MODULE_SOFTDEP("sha256");
2022 MODULE_SOFTDEP("sha512");
2023 MODULE_SOFTDEP("aead2");
2024 MODULE_SOFTDEP("ccm");
2025 MODULE_SOFTDEP("gcm");
2026 module_init(init_cifs)
2027 module_exit(exit_cifs)