1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2020, Microsoft Corporation.
10 #include <linux/module.h>
11 #include <linux/nsproxy.h>
12 #include <linux/slab.h>
13 #include <linux/magic.h>
14 #include <linux/security.h>
15 #include <net/net_namespace.h>
16 #ifdef CONFIG_CIFS_DFS_UPCALL
17 #include "dfs_cache.h"
21 #include <linux/ctype.h>
22 #include <linux/fs_context.h>
23 #include <linux/fs_parser.h>
25 #include <linux/mount.h>
26 #include <linux/parser.h>
27 #include <linux/utsname.h>
31 #include "cifsproto.h"
32 #include "cifs_unicode.h"
33 #include "cifs_debug.h"
34 #include "cifs_fs_sb.h"
37 #include "rfc1002pdu.h"
38 #include "fs_context.h"
40 static DEFINE_MUTEX(cifs_mount_mutex);
42 static const match_table_t cifs_smb_version_tokens = {
43 { Smb_1, SMB1_VERSION_STRING },
44 { Smb_20, SMB20_VERSION_STRING},
45 { Smb_21, SMB21_VERSION_STRING },
46 { Smb_30, SMB30_VERSION_STRING },
47 { Smb_302, SMB302_VERSION_STRING },
48 { Smb_302, ALT_SMB302_VERSION_STRING },
49 { Smb_311, SMB311_VERSION_STRING },
50 { Smb_311, ALT_SMB311_VERSION_STRING },
51 { Smb_3any, SMB3ANY_VERSION_STRING },
52 { Smb_default, SMBDEFAULT_VERSION_STRING },
53 { Smb_version_err, NULL }
56 static const match_table_t cifs_secflavor_tokens = {
57 { Opt_sec_krb5, "krb5" },
58 { Opt_sec_krb5i, "krb5i" },
59 { Opt_sec_krb5p, "krb5p" },
60 { Opt_sec_ntlmsspi, "ntlmsspi" },
61 { Opt_sec_ntlmssp, "ntlmssp" },
62 { Opt_sec_ntlmv2, "nontlm" },
63 { Opt_sec_ntlmv2, "ntlmv2" },
64 { Opt_sec_ntlmv2i, "ntlmv2i" },
65 { Opt_sec_none, "none" },
70 const struct fs_parameter_spec smb3_fs_parameters[] = {
71 /* Mount options that take no arguments */
72 fsparam_flag_no("user_xattr", Opt_user_xattr),
73 fsparam_flag_no("forceuid", Opt_forceuid),
74 fsparam_flag_no("multichannel", Opt_multichannel),
75 fsparam_flag_no("forcegid", Opt_forcegid),
76 fsparam_flag("noblocksend", Opt_noblocksend),
77 fsparam_flag("noautotune", Opt_noautotune),
78 fsparam_flag("nolease", Opt_nolease),
79 fsparam_flag_no("hard", Opt_hard),
80 fsparam_flag_no("soft", Opt_soft),
81 fsparam_flag_no("perm", Opt_perm),
82 fsparam_flag("nodelete", Opt_nodelete),
83 fsparam_flag_no("mapposix", Opt_mapposix),
84 fsparam_flag("mapchars", Opt_mapchars),
85 fsparam_flag("nomapchars", Opt_nomapchars),
86 fsparam_flag_no("sfu", Opt_sfu),
87 fsparam_flag("nodfs", Opt_nodfs),
88 fsparam_flag_no("posixpaths", Opt_posixpaths),
89 fsparam_flag_no("unix", Opt_unix),
90 fsparam_flag_no("linux", Opt_unix),
91 fsparam_flag_no("posix", Opt_unix),
92 fsparam_flag("nocase", Opt_nocase),
93 fsparam_flag("ignorecase", Opt_nocase),
94 fsparam_flag_no("brl", Opt_brl),
95 fsparam_flag_no("handlecache", Opt_handlecache),
96 fsparam_flag("forcemandatorylock", Opt_forcemandatorylock),
97 fsparam_flag("forcemand", Opt_forcemandatorylock),
98 fsparam_flag("setuidfromacl", Opt_setuidfromacl),
99 fsparam_flag("idsfromsid", Opt_setuidfromacl),
100 fsparam_flag_no("setuids", Opt_setuids),
101 fsparam_flag_no("dynperm", Opt_dynperm),
102 fsparam_flag_no("intr", Opt_intr),
103 fsparam_flag_no("strictsync", Opt_strictsync),
104 fsparam_flag_no("serverino", Opt_serverino),
105 fsparam_flag("rwpidforward", Opt_rwpidforward),
106 fsparam_flag("cifsacl", Opt_cifsacl),
107 fsparam_flag_no("acl", Opt_acl),
108 fsparam_flag("locallease", Opt_locallease),
109 fsparam_flag("sign", Opt_sign),
110 fsparam_flag("ignore_signature", Opt_ignore_signature),
111 fsparam_flag("signloosely", Opt_ignore_signature),
112 fsparam_flag("seal", Opt_seal),
113 fsparam_flag("noac", Opt_noac),
114 fsparam_flag("fsc", Opt_fsc),
115 fsparam_flag("mfsymlinks", Opt_mfsymlinks),
116 fsparam_flag("multiuser", Opt_multiuser),
117 fsparam_flag("sloppy", Opt_sloppy),
118 fsparam_flag("nosharesock", Opt_nosharesock),
119 fsparam_flag_no("persistenthandles", Opt_persistent),
120 fsparam_flag_no("resilienthandles", Opt_resilient),
121 fsparam_flag_no("tcpnodelay", Opt_tcp_nodelay),
122 fsparam_flag("domainauto", Opt_domainauto),
123 fsparam_flag("rdma", Opt_rdma),
124 fsparam_flag("modesid", Opt_modesid),
125 fsparam_flag("modefromsid", Opt_modesid),
126 fsparam_flag("rootfs", Opt_rootfs),
127 fsparam_flag("compress", Opt_compress),
128 fsparam_flag("witness", Opt_witness),
130 /* Mount options which take numeric value */
131 fsparam_u32("backupuid", Opt_backupuid),
132 fsparam_u32("backupgid", Opt_backupgid),
133 fsparam_u32("uid", Opt_uid),
134 fsparam_u32("cruid", Opt_cruid),
135 fsparam_u32("gid", Opt_gid),
136 fsparam_u32("file_mode", Opt_file_mode),
137 fsparam_u32("dirmode", Opt_dirmode),
138 fsparam_u32("dir_mode", Opt_dirmode),
139 fsparam_u32("port", Opt_port),
140 fsparam_u32("min_enc_offload", Opt_min_enc_offload),
141 fsparam_u32("esize", Opt_min_enc_offload),
142 fsparam_u32("bsize", Opt_blocksize),
143 fsparam_u32("rasize", Opt_rasize),
144 fsparam_u32("rsize", Opt_rsize),
145 fsparam_u32("wsize", Opt_wsize),
146 fsparam_u32("actimeo", Opt_actimeo),
147 fsparam_u32("acdirmax", Opt_acdirmax),
148 fsparam_u32("acregmax", Opt_acregmax),
149 fsparam_u32("echo_interval", Opt_echo_interval),
150 fsparam_u32("max_credits", Opt_max_credits),
151 fsparam_u32("handletimeout", Opt_handletimeout),
152 fsparam_u64("snapshot", Opt_snapshot),
153 fsparam_u32("max_channels", Opt_max_channels),
155 /* Mount options which take string value */
156 fsparam_string("source", Opt_source),
157 fsparam_string("user", Opt_user),
158 fsparam_string("username", Opt_user),
159 fsparam_string("pass", Opt_pass),
160 fsparam_string("password", Opt_pass),
161 fsparam_string("ip", Opt_ip),
162 fsparam_string("addr", Opt_ip),
163 fsparam_string("domain", Opt_domain),
164 fsparam_string("dom", Opt_domain),
165 fsparam_string("srcaddr", Opt_srcaddr),
166 fsparam_string("iocharset", Opt_iocharset),
167 fsparam_string("netbiosname", Opt_netbiosname),
168 fsparam_string("servern", Opt_servern),
169 fsparam_string("ver", Opt_ver),
170 fsparam_string("vers", Opt_vers),
171 fsparam_string("sec", Opt_sec),
172 fsparam_string("cache", Opt_cache),
174 /* Arguments that should be ignored */
175 fsparam_flag("guest", Opt_ignore),
176 fsparam_flag("noatime", Opt_ignore),
177 fsparam_flag("relatime", Opt_ignore),
178 fsparam_flag("_netdev", Opt_ignore),
179 fsparam_flag_no("suid", Opt_ignore),
180 fsparam_flag_no("exec", Opt_ignore),
181 fsparam_flag_no("dev", Opt_ignore),
182 fsparam_flag_no("mand", Opt_ignore),
183 fsparam_flag_no("auto", Opt_ignore),
184 fsparam_string("cred", Opt_ignore),
185 fsparam_string("credentials", Opt_ignore),
187 * UNC and prefixpath is now extracted from Opt_source
188 * in the new mount API so we can just ignore them going forward.
190 fsparam_string("unc", Opt_ignore),
191 fsparam_string("prefixpath", Opt_ignore),
196 cifs_parse_security_flavors(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
199 substring_t args[MAX_OPT_ARGS];
202 * With mount options, the last one should win. Reset any existing
203 * settings back to default.
205 ctx->sectype = Unspecified;
208 switch (match_token(value, cifs_secflavor_tokens, args)) {
210 cifs_errorf(fc, "sec=krb5p is not supported!\n");
216 ctx->sectype = Kerberos;
218 case Opt_sec_ntlmsspi:
221 case Opt_sec_ntlmssp:
222 ctx->sectype = RawNTLMSSP;
224 case Opt_sec_ntlmv2i:
228 ctx->sectype = NTLMv2;
234 cifs_errorf(fc, "bad security option: %s\n", value);
241 static const match_table_t cifs_cacheflavor_tokens = {
242 { Opt_cache_loose, "loose" },
243 { Opt_cache_strict, "strict" },
244 { Opt_cache_none, "none" },
245 { Opt_cache_ro, "ro" },
246 { Opt_cache_rw, "singleclient" },
247 { Opt_cache_err, NULL }
251 cifs_parse_cache_flavor(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
253 substring_t args[MAX_OPT_ARGS];
255 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
256 case Opt_cache_loose:
257 ctx->direct_io = false;
258 ctx->strict_io = false;
259 ctx->cache_ro = false;
260 ctx->cache_rw = false;
262 case Opt_cache_strict:
263 ctx->direct_io = false;
264 ctx->strict_io = true;
265 ctx->cache_ro = false;
266 ctx->cache_rw = false;
269 ctx->direct_io = true;
270 ctx->strict_io = false;
271 ctx->cache_ro = false;
272 ctx->cache_rw = false;
275 ctx->direct_io = false;
276 ctx->strict_io = false;
277 ctx->cache_ro = true;
278 ctx->cache_rw = false;
281 ctx->direct_io = false;
282 ctx->strict_io = false;
283 ctx->cache_ro = false;
284 ctx->cache_rw = true;
287 cifs_errorf(fc, "bad cache= option: %s\n", value);
293 #define DUP_CTX_STR(field) \
296 new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC); \
297 if (new_ctx->field == NULL) { \
298 smb3_cleanup_fs_context_contents(new_ctx); \
305 smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx)
307 memcpy(new_ctx, ctx, sizeof(*ctx));
308 new_ctx->prepath = NULL;
309 new_ctx->mount_options = NULL;
310 new_ctx->nodename = NULL;
311 new_ctx->username = NULL;
312 new_ctx->password = NULL;
313 new_ctx->server_hostname = NULL;
314 new_ctx->domainname = NULL;
315 new_ctx->workstation_name = NULL;
317 new_ctx->source = NULL;
318 new_ctx->iocharset = NULL;
320 * Make sure to stay in sync with smb3_cleanup_fs_context_contents()
322 DUP_CTX_STR(prepath);
323 DUP_CTX_STR(mount_options);
324 DUP_CTX_STR(username);
325 DUP_CTX_STR(password);
326 DUP_CTX_STR(server_hostname);
329 DUP_CTX_STR(domainname);
330 DUP_CTX_STR(workstation_name);
331 DUP_CTX_STR(nodename);
332 DUP_CTX_STR(iocharset);
338 cifs_parse_smb_version(struct fs_context *fc, char *value, struct smb3_fs_context *ctx, bool is_smb3)
340 substring_t args[MAX_OPT_ARGS];
342 switch (match_token(value, cifs_smb_version_tokens, args)) {
343 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
345 if (disable_legacy_dialects) {
346 cifs_errorf(fc, "mount with legacy dialect disabled\n");
350 cifs_errorf(fc, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
353 cifs_errorf(fc, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
354 ctx->ops = &smb1_operations;
355 ctx->vals = &smb1_values;
358 if (disable_legacy_dialects) {
359 cifs_errorf(fc, "mount with legacy dialect disabled\n");
363 cifs_errorf(fc, "vers=2.0 not permitted when mounting with smb3\n");
366 ctx->ops = &smb20_operations;
367 ctx->vals = &smb20_values;
371 cifs_errorf(fc, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
374 cifs_errorf(fc, "vers=2.0 mount not permitted when legacy dialects disabled\n");
376 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
378 ctx->ops = &smb21_operations;
379 ctx->vals = &smb21_values;
382 ctx->ops = &smb30_operations;
383 ctx->vals = &smb30_values;
386 ctx->ops = &smb30_operations; /* currently identical with 3.0 */
387 ctx->vals = &smb302_values;
390 ctx->ops = &smb311_operations;
391 ctx->vals = &smb311_values;
394 ctx->ops = &smb30_operations; /* currently identical with 3.0 */
395 ctx->vals = &smb3any_values;
398 ctx->ops = &smb30_operations;
399 ctx->vals = &smbdefault_values;
402 cifs_errorf(fc, "Unknown vers= option specified: %s\n", value);
408 int smb3_parse_opt(const char *options, const char *key, char **val)
411 char *opts, *orig, *p;
413 orig = opts = kstrdup(options, GFP_KERNEL);
417 while ((p = strsep(&opts, ","))) {
422 if (strncasecmp(p, key, strlen(key)))
424 nval = strchr(p, '=');
429 *val = kstrdup(nval, GFP_KERNEL);
430 rc = !*val ? -ENOMEM : 0;
440 * Remove duplicate path delimiters. Windows is supposed to do that
441 * but there are some bugs that prevent rename from working if there are
442 * multiple delimiters.
444 * Returns a sanitized duplicate of @path. The caller is responsible for
445 * cleaning up the original.
447 #define IS_DELIM(c) ((c) == '/' || (c) == '\\')
448 static char *sanitize_path(char *path)
450 char *cursor1 = path, *cursor2 = path;
452 /* skip all prepended delimiters */
453 while (IS_DELIM(*cursor1))
456 /* copy the first letter */
459 /* copy the remainder... */
460 while (*(cursor1++)) {
461 /* ... skipping all duplicated delimiters */
462 if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2))
464 *(++cursor2) = *cursor1;
467 /* if the last character is a delimiter, skip it */
468 if (IS_DELIM(*(cursor2 - 1)))
472 return kstrdup(path, GFP_KERNEL);
476 * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath
477 * fields with the result. Returns 0 on success and an error otherwise
478 * (e.g. ENOMEM or EINVAL)
481 smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
484 const char *delims = "/\\";
487 if (unlikely(!devname || !*devname)) {
488 cifs_dbg(VFS, "Device name not specified\n");
492 /* make sure we have a valid UNC double delimiter prefix */
493 len = strspn(devname, delims);
497 /* find delimiter between host and sharename */
498 pos = strpbrk(devname + 2, delims);
502 /* record the server hostname */
503 kfree(ctx->server_hostname);
504 ctx->server_hostname = kstrndup(devname + 2, pos - devname - 2, GFP_KERNEL);
505 if (!ctx->server_hostname)
508 /* skip past delimiter */
511 /* now go until next delimiter or end of string */
512 len = strcspn(pos, delims);
514 /* move "pos" up to delimiter or NULL */
517 ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
521 convert_delimiter(ctx->UNC, '\\');
523 /* skip any delimiter */
524 if (*pos == '/' || *pos == '\\')
530 /* If pos is NULL then no prepath */
534 ctx->prepath = sanitize_path(pos);
541 static void smb3_fs_context_free(struct fs_context *fc);
542 static int smb3_fs_context_parse_param(struct fs_context *fc,
543 struct fs_parameter *param);
544 static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
546 static int smb3_get_tree(struct fs_context *fc);
547 static int smb3_reconfigure(struct fs_context *fc);
549 static const struct fs_context_operations smb3_fs_context_ops = {
550 .free = smb3_fs_context_free,
551 .parse_param = smb3_fs_context_parse_param,
552 .parse_monolithic = smb3_fs_context_parse_monolithic,
553 .get_tree = smb3_get_tree,
554 .reconfigure = smb3_reconfigure,
558 * Parse a monolithic block of data from sys_mount().
559 * smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data
560 * @ctx: The superblock configuration to fill in.
561 * @data: The data to parse
563 * Parse a blob of data that's in key[=val][,key[=val]]* form. This can be
564 * called from the ->monolithic_mount_data() fs_context operation.
566 * Returns 0 on success or the error returned by the ->parse_option() fs_context
567 * operation on failure.
569 static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
572 struct smb3_fs_context *ctx = smb3_fc2context(fc);
573 char *options = data, *key;
579 ctx->mount_options = kstrdup(data, GFP_KERNEL);
580 if (ctx->mount_options == NULL)
583 ret = security_sb_eat_lsm_opts(options, &fc->security);
587 /* BB Need to add support for sep= here TBD */
588 while ((key = strsep(&options, ",")) != NULL) {
595 /* Check if following character is the deliminator If yes,
596 * we have encountered a double deliminator reset the NULL
597 * character to the deliminator
599 while (options && options[0] == ',') {
601 strcpy(key + len, options);
602 options = strchr(options, ',');
609 value = strchr(key, '=');
617 ret = vfs_parse_fs_string(fc, key, value, len);
626 * Validate the preparsed information in the config.
628 static int smb3_fs_context_validate(struct fs_context *fc)
630 struct smb3_fs_context *ctx = smb3_fc2context(fc);
632 if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
633 cifs_errorf(fc, "SMB Direct requires Version >=3.0\n");
638 /* Muliuser mounts require CONFIG_KEYS support */
639 if (ctx->multiuser) {
640 cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
645 if (ctx->got_version == false)
646 pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n");
650 cifs_errorf(fc, "CIFS mount error: No usable UNC path provided in device string!\n");
654 /* make sure UNC has a share name */
655 if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) {
656 cifs_errorf(fc, "Malformed UNC. Unable to find share name.\n");
664 /* No ip= option specified? Try to get it from UNC */
665 /* Use the address part of the UNC. */
666 slash = strchr(&ctx->UNC[2], '\\');
667 len = slash - &ctx->UNC[2];
668 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
669 &ctx->UNC[2], len)) {
670 pr_err("Unable to determine destination address\n");
671 return -EHOSTUNREACH;
675 /* set the port that we got earlier */
676 cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port);
678 if (ctx->override_uid && !ctx->uid_specified) {
679 ctx->override_uid = 0;
680 pr_notice("ignoring forceuid mount option specified with no uid= option\n");
683 if (ctx->override_gid && !ctx->gid_specified) {
684 ctx->override_gid = 0;
685 pr_notice("ignoring forcegid mount option specified with no gid= option\n");
691 static int smb3_get_tree_common(struct fs_context *fc)
693 struct smb3_fs_context *ctx = smb3_fc2context(fc);
697 root = cifs_smb3_do_mount(fc->fs_type, 0, ctx);
699 return PTR_ERR(root);
707 * Create an SMB3 superblock from the parameters passed.
709 static int smb3_get_tree(struct fs_context *fc)
711 int err = smb3_fs_context_validate(fc);
716 mutex_lock(&cifs_mount_mutex);
717 ret = smb3_get_tree_common(fc);
718 mutex_unlock(&cifs_mount_mutex);
722 static void smb3_fs_context_free(struct fs_context *fc)
724 struct smb3_fs_context *ctx = smb3_fc2context(fc);
726 smb3_cleanup_fs_context(ctx);
730 * Compare the old and new proposed context during reconfigure
731 * and check if the changes are compatible.
733 static int smb3_verify_reconfigure_ctx(struct fs_context *fc,
734 struct smb3_fs_context *new_ctx,
735 struct smb3_fs_context *old_ctx)
737 if (new_ctx->posix_paths != old_ctx->posix_paths) {
738 cifs_errorf(fc, "can not change posixpaths during remount\n");
741 if (new_ctx->sectype != old_ctx->sectype) {
742 cifs_errorf(fc, "can not change sec during remount\n");
745 if (new_ctx->multiuser != old_ctx->multiuser) {
746 cifs_errorf(fc, "can not change multiuser during remount\n");
750 (!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) {
751 cifs_errorf(fc, "can not change UNC during remount\n");
754 if (new_ctx->username &&
755 (!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) {
756 cifs_errorf(fc, "can not change username during remount\n");
759 if (new_ctx->password &&
760 (!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) {
761 cifs_errorf(fc, "can not change password during remount\n");
764 if (new_ctx->domainname &&
765 (!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) {
766 cifs_errorf(fc, "can not change domainname during remount\n");
769 if (new_ctx->workstation_name &&
770 (!old_ctx->workstation_name || strcmp(new_ctx->workstation_name, old_ctx->workstation_name))) {
771 cifs_errorf(fc, "can not change workstation_name during remount\n");
774 if (new_ctx->nodename &&
775 (!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) {
776 cifs_errorf(fc, "can not change nodename during remount\n");
779 if (new_ctx->iocharset &&
780 (!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) {
781 cifs_errorf(fc, "can not change iocharset during remount\n");
788 #define STEAL_STRING(cifs_sb, ctx, field) \
791 ctx->field = cifs_sb->ctx->field; \
792 cifs_sb->ctx->field = NULL; \
795 static int smb3_reconfigure(struct fs_context *fc)
797 struct smb3_fs_context *ctx = smb3_fc2context(fc);
798 struct dentry *root = fc->root;
799 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
802 rc = smb3_verify_reconfigure_ctx(fc, ctx, cifs_sb->ctx);
807 * We can not change UNC/username/password/domainname/
808 * workstation_name/nodename/iocharset
809 * during reconnect so ignore what we have in the new context and
810 * just use what we already have in cifs_sb->ctx.
812 STEAL_STRING(cifs_sb, ctx, UNC);
813 STEAL_STRING(cifs_sb, ctx, source);
814 STEAL_STRING(cifs_sb, ctx, username);
815 STEAL_STRING(cifs_sb, ctx, password);
816 STEAL_STRING(cifs_sb, ctx, domainname);
817 STEAL_STRING(cifs_sb, ctx, workstation_name);
818 STEAL_STRING(cifs_sb, ctx, nodename);
819 STEAL_STRING(cifs_sb, ctx, iocharset);
821 /* if rsize or wsize not passed in on remount, use previous values */
823 ctx->rsize = cifs_sb->ctx->rsize;
825 ctx->wsize = cifs_sb->ctx->wsize;
828 smb3_cleanup_fs_context_contents(cifs_sb->ctx);
829 rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
830 smb3_update_mnt_flags(cifs_sb);
831 #ifdef CONFIG_CIFS_DFS_UPCALL
833 rc = dfs_cache_remount_fs(cifs_sb);
839 static int smb3_fs_context_parse_param(struct fs_context *fc,
840 struct fs_parameter *param)
842 struct fs_parse_result result;
843 struct smb3_fs_context *ctx = smb3_fc2context(fc);
845 bool is_smb3 = !strcmp(fc->fs_type->name, "smb3");
846 bool skip_parsing = false;
850 cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key);
853 * fs_parse can not handle string options with an empty value so
854 * we will need special handling of them.
856 if (param->type == fs_value_is_string && param->string[0] == 0) {
857 if (!strcmp("pass", param->key) || !strcmp("password", param->key)) {
860 } else if (!strcmp("user", param->key) || !strcmp("username", param->key)) {
867 opt = fs_parse(fc, smb3_fs_parameters, param, &result);
869 return ctx->sloppy ? 1 : opt;
874 ctx->compression = UNKNOWN_TYPE;
876 "SMB3 compression support is experimental\n");
898 ctx->sfu_remap = false; /* disable SFU mapping */
909 ctx->override_uid = 0;
911 ctx->override_uid = 1;
915 ctx->override_gid = 0;
917 ctx->override_gid = 1;
937 case Opt_noblocksend:
949 case Opt_multichannel:
950 if (result.negated) {
951 ctx->multichannel = false;
952 ctx->max_channels = 1;
954 ctx->multichannel = true;
955 /* if number of channels not specified, default to 2 */
956 if (ctx->max_channels < 2)
957 ctx->max_channels = 2;
961 uid = make_kuid(current_user_ns(), result.uint_32);
963 goto cifs_parse_mount_err;
964 ctx->linux_uid = uid;
965 ctx->uid_specified = true;
968 uid = make_kuid(current_user_ns(), result.uint_32);
970 goto cifs_parse_mount_err;
972 ctx->cruid_specified = true;
975 uid = make_kuid(current_user_ns(), result.uint_32);
977 goto cifs_parse_mount_err;
978 ctx->backupuid = uid;
979 ctx->backupuid_specified = true;
982 gid = make_kgid(current_user_ns(), result.uint_32);
984 goto cifs_parse_mount_err;
985 ctx->backupgid = gid;
986 ctx->backupgid_specified = true;
989 gid = make_kgid(current_user_ns(), result.uint_32);
991 goto cifs_parse_mount_err;
992 ctx->linux_gid = gid;
993 ctx->gid_specified = true;
996 ctx->port = result.uint_32;
999 ctx->file_mode = result.uint_32;
1002 ctx->dir_mode = result.uint_32;
1004 case Opt_min_enc_offload:
1005 ctx->min_offload = result.uint_32;
1009 * inode blocksize realistically should never need to be
1010 * less than 16K or greater than 16M and default is 1MB.
1011 * Note that small inode block sizes (e.g. 64K) can lead
1012 * to very poor performance of common tools like cp and scp
1014 if ((result.uint_32 < CIFS_MAX_MSGSIZE) ||
1015 (result.uint_32 > (4 * SMB3_DEFAULT_IOSIZE))) {
1016 cifs_errorf(fc, "%s: Invalid blocksize\n",
1018 goto cifs_parse_mount_err;
1020 ctx->bsize = result.uint_32;
1021 ctx->got_bsize = true;
1025 * readahead size realistically should never need to be
1026 * less than 1M (CIFS_DEFAULT_IOSIZE) or greater than 32M
1027 * (perhaps an exception should be considered in the
1028 * for the case of a large number of channels
1029 * when multichannel is negotiated) since that would lead
1030 * to plenty of parallel I/O in flight to the server.
1031 * Note that smaller read ahead sizes would
1032 * hurt performance of common tools like cp and scp
1033 * which often trigger sequential i/o with read ahead
1035 if ((result.uint_32 > (8 * SMB3_DEFAULT_IOSIZE)) ||
1036 (result.uint_32 < CIFS_DEFAULT_IOSIZE)) {
1037 cifs_errorf(fc, "%s: Invalid rasize %d vs. %d\n",
1038 __func__, result.uint_32, SMB3_DEFAULT_IOSIZE);
1039 goto cifs_parse_mount_err;
1041 ctx->rasize = result.uint_32;
1044 ctx->rsize = result.uint_32;
1045 ctx->got_rsize = true;
1048 ctx->wsize = result.uint_32;
1049 ctx->got_wsize = true;
1052 ctx->acregmax = HZ * result.uint_32;
1053 if (ctx->acregmax > CIFS_MAX_ACTIMEO) {
1054 cifs_errorf(fc, "acregmax too large\n");
1055 goto cifs_parse_mount_err;
1059 ctx->acdirmax = HZ * result.uint_32;
1060 if (ctx->acdirmax > CIFS_MAX_ACTIMEO) {
1061 cifs_errorf(fc, "acdirmax too large\n");
1062 goto cifs_parse_mount_err;
1066 if (HZ * result.uint_32 > CIFS_MAX_ACTIMEO) {
1067 cifs_errorf(fc, "timeout too large\n");
1068 goto cifs_parse_mount_err;
1070 if ((ctx->acdirmax != CIFS_DEF_ACTIMEO) ||
1071 (ctx->acregmax != CIFS_DEF_ACTIMEO)) {
1072 cifs_errorf(fc, "actimeo ignored since acregmax or acdirmax specified\n");
1075 ctx->acdirmax = ctx->acregmax = HZ * result.uint_32;
1077 case Opt_echo_interval:
1078 ctx->echo_interval = result.uint_32;
1081 ctx->snapshot_time = result.uint_64;
1083 case Opt_max_credits:
1084 if (result.uint_32 < 20 || result.uint_32 > 60000) {
1085 cifs_errorf(fc, "%s: Invalid max_credits value\n",
1087 goto cifs_parse_mount_err;
1089 ctx->max_credits = result.uint_32;
1091 case Opt_max_channels:
1092 if (result.uint_32 < 1 || result.uint_32 > CIFS_MAX_CHANNELS) {
1093 cifs_errorf(fc, "%s: Invalid max_channels value, needs to be 1-%d\n",
1094 __func__, CIFS_MAX_CHANNELS);
1095 goto cifs_parse_mount_err;
1097 ctx->max_channels = result.uint_32;
1098 /* If more than one channel requested ... they want multichan */
1099 if (result.uint_32 > 1)
1100 ctx->multichannel = true;
1102 case Opt_handletimeout:
1103 ctx->handle_timeout = result.uint_32;
1104 if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
1105 cifs_errorf(fc, "Invalid handle cache timeout, longer than 16 minutes\n");
1106 goto cifs_parse_mount_err;
1112 switch (smb3_parse_devname(param->string, ctx)) {
1116 cifs_errorf(fc, "Unable to allocate memory for devname\n");
1117 goto cifs_parse_mount_err;
1119 cifs_errorf(fc, "Malformed UNC in devname\n");
1120 goto cifs_parse_mount_err;
1122 cifs_errorf(fc, "Unknown error parsing devname\n");
1123 goto cifs_parse_mount_err;
1125 ctx->source = kstrdup(param->string, GFP_KERNEL);
1126 if (ctx->source == NULL) {
1127 cifs_errorf(fc, "OOM when copying UNC string\n");
1128 goto cifs_parse_mount_err;
1130 fc->source = kstrdup(param->string, GFP_KERNEL);
1131 if (fc->source == NULL) {
1132 cifs_errorf(fc, "OOM when copying UNC string\n");
1133 goto cifs_parse_mount_err;
1137 kfree(ctx->username);
1138 ctx->username = NULL;
1139 if (strlen(param->string) == 0) {
1140 /* null user, ie. anonymous authentication */
1145 if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) >
1146 CIFS_MAX_USERNAME_LEN) {
1147 pr_warn("username too long\n");
1148 goto cifs_parse_mount_err;
1150 ctx->username = kstrdup(param->string, GFP_KERNEL);
1151 if (ctx->username == NULL) {
1152 cifs_errorf(fc, "OOM when copying username string\n");
1153 goto cifs_parse_mount_err;
1157 kfree(ctx->password);
1158 ctx->password = NULL;
1159 if (strlen(param->string) == 0)
1162 ctx->password = kstrdup(param->string, GFP_KERNEL);
1163 if (ctx->password == NULL) {
1164 cifs_errorf(fc, "OOM when copying password string\n");
1165 goto cifs_parse_mount_err;
1169 if (strlen(param->string) == 0) {
1170 ctx->got_ip = false;
1173 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
1175 strlen(param->string))) {
1176 pr_err("bad ip= option (%s)\n", param->string);
1177 goto cifs_parse_mount_err;
1182 if (strnlen(param->string, CIFS_MAX_DOMAINNAME_LEN)
1183 == CIFS_MAX_DOMAINNAME_LEN) {
1184 pr_warn("domain name too long\n");
1185 goto cifs_parse_mount_err;
1188 kfree(ctx->domainname);
1189 ctx->domainname = kstrdup(param->string, GFP_KERNEL);
1190 if (ctx->domainname == NULL) {
1191 cifs_errorf(fc, "OOM when copying domainname string\n");
1192 goto cifs_parse_mount_err;
1194 cifs_dbg(FYI, "Domain name set\n");
1197 if (!cifs_convert_address(
1198 (struct sockaddr *)&ctx->srcaddr,
1199 param->string, strlen(param->string))) {
1200 pr_warn("Could not parse srcaddr: %s\n",
1202 goto cifs_parse_mount_err;
1206 if (strnlen(param->string, 1024) >= 65) {
1207 pr_warn("iocharset name too long\n");
1208 goto cifs_parse_mount_err;
1211 if (strncasecmp(param->string, "default", 7) != 0) {
1212 kfree(ctx->iocharset);
1213 ctx->iocharset = kstrdup(param->string, GFP_KERNEL);
1214 if (ctx->iocharset == NULL) {
1215 cifs_errorf(fc, "OOM when copying iocharset string\n");
1216 goto cifs_parse_mount_err;
1219 /* if iocharset not set then load_nls_default
1222 cifs_dbg(FYI, "iocharset set to %s\n", ctx->iocharset);
1224 case Opt_netbiosname:
1225 memset(ctx->source_rfc1001_name, 0x20,
1228 * FIXME: are there cases in which a comma can
1229 * be valid in workstation netbios name (and
1230 * need special handling)?
1232 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1233 /* don't ucase netbiosname for user */
1234 if (param->string[i] == 0)
1236 ctx->source_rfc1001_name[i] = param->string[i];
1238 /* The string has 16th byte zero still from
1239 * set at top of the function
1241 if (i == RFC1001_NAME_LEN && param->string[i] != 0)
1242 pr_warn("netbiosname longer than 15 truncated\n");
1245 /* last byte, type, is 0x20 for servr type */
1246 memset(ctx->target_rfc1001_name, 0x20,
1247 RFC1001_NAME_LEN_WITH_NULL);
1249 * BB are there cases in which a comma can be valid in this
1250 * workstation netbios name (and need special handling)?
1253 /* user or mount helper must uppercase the netbios name */
1254 for (i = 0; i < 15; i++) {
1255 if (param->string[i] == 0)
1257 ctx->target_rfc1001_name[i] = param->string[i];
1260 /* The string has 16th byte zero still from set at top of function */
1261 if (i == RFC1001_NAME_LEN && param->string[i] != 0)
1262 pr_warn("server netbiosname longer than 15 truncated\n");
1265 /* version of mount userspace tools, not dialect */
1266 /* If interface changes in mount.cifs bump to new ver */
1267 if (strncasecmp(param->string, "1", 1) == 0) {
1268 if (strlen(param->string) > 1) {
1269 pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n",
1271 goto cifs_parse_mount_err;
1273 /* This is the default */
1276 /* For all other value, error */
1277 pr_warn("Invalid mount helper version specified\n");
1278 goto cifs_parse_mount_err;
1280 /* protocol version (dialect) */
1281 if (cifs_parse_smb_version(fc, param->string, ctx, is_smb3) != 0)
1282 goto cifs_parse_mount_err;
1283 ctx->got_version = true;
1286 if (cifs_parse_security_flavors(fc, param->string, ctx) != 0)
1287 goto cifs_parse_mount_err;
1290 if (cifs_parse_cache_flavor(fc, param->string, ctx) != 0)
1291 goto cifs_parse_mount_err;
1294 #ifndef CONFIG_CIFS_SWN_UPCALL
1295 cifs_errorf(fc, "Witness support needs CONFIG_CIFS_SWN_UPCALL config option\n");
1296 goto cifs_parse_mount_err;
1298 ctx->witness = true;
1299 pr_warn_once("Witness protocol support is experimental\n");
1302 #ifndef CONFIG_CIFS_ROOT
1303 cifs_dbg(VFS, "rootfs support requires CONFIG_CIFS_ROOT config option\n");
1304 goto cifs_parse_mount_err;
1308 case Opt_posixpaths:
1310 ctx->posix_paths = 0;
1312 ctx->posix_paths = 1;
1315 if (result.negated) {
1316 if (ctx->linux_ext == 1)
1317 pr_warn_once("conflicting posix mount options specified\n");
1319 ctx->no_linux_ext = 1;
1321 if (ctx->no_linux_ext == 1)
1322 pr_warn_once("conflicting posix mount options specified\n");
1324 ctx->no_linux_ext = 0;
1331 if (result.negated) {
1333 * turn off mandatory locking in mode
1334 * if remote locking is turned off since the
1335 * local vfs will do advisory
1337 if (ctx->file_mode ==
1338 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1339 ctx->file_mode = S_IALLUGO;
1344 case Opt_handlecache:
1346 ctx->nohandlecache = 1;
1348 ctx->nohandlecache = 0;
1350 case Opt_forcemandatorylock:
1354 ctx->setuids = result.negated;
1357 ctx->intr = !result.negated;
1359 case Opt_setuidfromacl:
1360 ctx->setuidfromacl = 1;
1362 case Opt_strictsync:
1363 ctx->nostrictsync = result.negated;
1366 ctx->server_ino = !result.negated;
1368 case Opt_rwpidforward:
1369 ctx->rwpidforward = 1;
1375 ctx->cifs_acl = !result.negated;
1378 ctx->no_psx_acl = result.negated;
1380 case Opt_locallease:
1381 ctx->local_lease = 1;
1386 case Opt_ignore_signature:
1388 ctx->ignore_signature = true;
1391 /* we do not do the following in secFlags because seal
1392 * is a per tree connection (mount) not a per socket
1393 * or per-smb connection option in the protocol
1394 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1399 pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1402 #ifndef CONFIG_CIFS_FSCACHE
1403 cifs_errorf(fc, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1404 goto cifs_parse_mount_err;
1408 case Opt_mfsymlinks:
1409 ctx->mfsymlinks = true;
1412 ctx->multiuser = true;
1417 case Opt_nosharesock:
1418 ctx->nosharesock = true;
1420 case Opt_persistent:
1421 if (result.negated) {
1422 ctx->nopersistent = true;
1423 if (ctx->persistent) {
1424 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1425 goto cifs_parse_mount_err;
1428 ctx->persistent = true;
1429 if ((ctx->nopersistent) || (ctx->resilient)) {
1430 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1431 goto cifs_parse_mount_err;
1436 if (result.negated) {
1437 ctx->resilient = false; /* already the default */
1439 ctx->resilient = true;
1440 if (ctx->persistent) {
1441 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1442 goto cifs_parse_mount_err;
1446 case Opt_tcp_nodelay:
1447 /* tcp nodelay should not usually be needed since we CORK/UNCORK the socket */
1449 ctx->sockopt_tcp_nodelay = false;
1451 ctx->sockopt_tcp_nodelay = true;
1453 case Opt_domainauto:
1454 ctx->domainauto = true;
1460 /* case Opt_ignore: - is ignored as expected ... */
1464 cifs_parse_mount_err:
1468 int smb3_init_fs_context(struct fs_context *fc)
1471 struct smb3_fs_context *ctx;
1472 char *nodename = utsname()->nodename;
1475 ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
1476 if (unlikely(!ctx)) {
1481 ctx->workstation_name = kstrdup(nodename, GFP_KERNEL);
1482 if (unlikely(!ctx->workstation_name)) {
1488 * does not have to be perfect mapping since field is
1489 * informational, only used for servers that do not support
1490 * port 445 and it can be overridden at mount time
1492 memset(ctx->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1493 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1494 ctx->source_rfc1001_name[i] = toupper(nodename[i]);
1496 ctx->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1498 * null target name indicates to use *SMBSERVR default called name
1499 * if we end up sending RFC1001 session initialize
1501 ctx->target_rfc1001_name[0] = 0;
1502 ctx->cred_uid = current_uid();
1503 ctx->linux_uid = current_uid();
1504 ctx->linux_gid = current_gid();
1505 /* By default 4MB read ahead size, 1MB block size */
1506 ctx->bsize = CIFS_DEFAULT_IOSIZE; /* can improve cp performance significantly */
1507 ctx->rasize = 0; /* 0 = use default (ie negotiated rsize) for read ahead pages */
1510 * default to SFM style remapping of seven reserved characters
1511 * unless user overrides it or we negotiate CIFS POSIX where
1512 * it is unnecessary. Can not simultaneously use more than one mapping
1513 * since then readdir could list files that open could not open
1517 /* default to only allowing write access to owner of the mount */
1518 ctx->dir_mode = ctx->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1520 /* ctx->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1521 /* default is always to request posix paths. */
1522 ctx->posix_paths = 1;
1523 /* default to using server inode numbers where available */
1524 ctx->server_ino = 1;
1526 /* default is to use strict cifs caching semantics */
1527 ctx->strict_io = true;
1529 ctx->acregmax = CIFS_DEF_ACTIMEO;
1530 ctx->acdirmax = CIFS_DEF_ACTIMEO;
1532 /* Most clients set timeout to 0, allows server to use its default */
1533 ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
1535 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1536 ctx->ops = &smb30_operations;
1537 ctx->vals = &smbdefault_values;
1539 ctx->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1541 /* default to no multichannel (single server connection) */
1542 ctx->multichannel = false;
1543 ctx->max_channels = 1;
1545 ctx->backupuid_specified = false; /* no backup intent for a user */
1546 ctx->backupgid_specified = false; /* no backup intent for a group */
1549 * short int override_uid = -1;
1550 * short int override_gid = -1;
1551 * char *nodename = strdup(utsname()->nodename);
1552 * struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1555 fc->fs_private = ctx;
1556 fc->ops = &smb3_fs_context_ops;
1561 kfree(ctx->workstation_name);
1569 smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx)
1575 * Make sure this stays in sync with smb3_fs_context_dup()
1577 kfree(ctx->mount_options);
1578 ctx->mount_options = NULL;
1579 kfree(ctx->username);
1580 ctx->username = NULL;
1581 kfree_sensitive(ctx->password);
1582 ctx->password = NULL;
1583 kfree(ctx->server_hostname);
1584 ctx->server_hostname = NULL;
1589 kfree(ctx->domainname);
1590 ctx->domainname = NULL;
1591 kfree(ctx->workstation_name);
1592 ctx->workstation_name = NULL;
1593 kfree(ctx->nodename);
1594 ctx->nodename = NULL;
1595 kfree(ctx->iocharset);
1596 ctx->iocharset = NULL;
1597 kfree(ctx->prepath);
1598 ctx->prepath = NULL;
1602 smb3_cleanup_fs_context(struct smb3_fs_context *ctx)
1606 smb3_cleanup_fs_context_contents(ctx);
1610 void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb)
1612 struct smb3_fs_context *ctx = cifs_sb->ctx;
1615 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
1617 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_DFS;
1620 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
1622 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_PERM;
1625 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
1627 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SET_UID;
1629 if (ctx->setuidfromacl)
1630 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
1632 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UID_FROM_ACL;
1634 if (ctx->server_ino)
1635 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
1637 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
1640 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
1642 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SFM_CHR;
1645 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
1647 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SPECIAL_CHR;
1650 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
1652 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_XATTR;
1655 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
1657 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UNX_EMUL;
1660 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
1662 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_BRL;
1664 if (ctx->nohandlecache)
1665 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
1667 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_HANDLE_CACHE;
1669 if (ctx->nostrictsync)
1670 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
1672 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOSSYNC;
1675 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
1677 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOPOSIXBRL;
1679 if (ctx->rwpidforward)
1680 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
1682 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_RWPIDFORWARD;
1685 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
1687 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MODE_FROM_SID;
1690 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
1692 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_ACL;
1694 if (ctx->backupuid_specified)
1695 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
1697 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPUID;
1699 if (ctx->backupgid_specified)
1700 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
1702 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPGID;
1704 if (ctx->override_uid)
1705 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
1707 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_UID;
1709 if (ctx->override_gid)
1710 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
1712 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_GID;
1715 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
1717 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DYNPERM;
1720 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
1722 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_FSCACHE;
1725 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
1726 CIFS_MOUNT_NO_PERM);
1728 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER;
1732 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
1734 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_STRICT_IO;
1737 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
1739 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DIRECT_IO;
1741 if (ctx->mfsymlinks)
1742 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
1744 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MF_SYMLINKS;
1745 if (ctx->mfsymlinks) {
1746 if (ctx->sfu_emul) {
1748 * Our SFU ("Services for Unix" emulation does not allow
1749 * creating symlinks but does allow reading existing SFU
1750 * symlinks (it does allow both creating and reading SFU
1751 * style mknod and FIFOs though). When "mfsymlinks" and
1752 * "sfu" are both enabled at the same time, it allows
1753 * reading both types of symlinks, but will only create
1754 * them with mfsymlinks format. This allows better
1755 * Apple compatibility (probably better for Samba too)
1756 * while still recognizing old Windows style symlinks.
1758 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
1761 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SHUTDOWN;