1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2020, Microsoft Corporation.
5 * Author(s): Steve French <stfrench@microsoft.com>
6 * David Howells <dhowells@redhat.com>
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>
18 #include <linux/ctype.h>
19 #include <linux/fs_context.h>
20 #include <linux/fs_parser.h>
22 #include <linux/mount.h>
23 #include <linux/parser.h>
24 #include <linux/utsname.h>
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
34 #include "rfc1002pdu.h"
35 #include "fs_context.h"
37 static const match_table_t cifs_smb_version_tokens = {
38 { Smb_1, SMB1_VERSION_STRING },
39 { Smb_20, SMB20_VERSION_STRING},
40 { Smb_21, SMB21_VERSION_STRING },
41 { Smb_30, SMB30_VERSION_STRING },
42 { Smb_302, SMB302_VERSION_STRING },
43 { Smb_302, ALT_SMB302_VERSION_STRING },
44 { Smb_311, SMB311_VERSION_STRING },
45 { Smb_311, ALT_SMB311_VERSION_STRING },
46 { Smb_3any, SMB3ANY_VERSION_STRING },
47 { Smb_default, SMBDEFAULT_VERSION_STRING },
48 { Smb_version_err, NULL }
51 static const match_table_t cifs_secflavor_tokens = {
52 { Opt_sec_krb5, "krb5" },
53 { Opt_sec_krb5i, "krb5i" },
54 { Opt_sec_krb5p, "krb5p" },
55 { Opt_sec_ntlmsspi, "ntlmsspi" },
56 { Opt_sec_ntlmssp, "ntlmssp" },
58 { Opt_sec_ntlmi, "ntlmi" },
59 { Opt_sec_ntlmv2, "nontlm" },
60 { Opt_sec_ntlmv2, "ntlmv2" },
61 { Opt_sec_ntlmv2i, "ntlmv2i" },
62 { Opt_sec_lanman, "lanman" },
63 { Opt_sec_none, "none" },
68 const struct fs_parameter_spec smb3_fs_parameters[] = {
69 /* Mount options that take no arguments */
70 fsparam_flag_no("user_xattr", Opt_user_xattr),
71 fsparam_flag_no("forceuid", Opt_forceuid),
72 fsparam_flag_no("multichannel", Opt_multichannel),
73 fsparam_flag_no("forcegid", Opt_forcegid),
74 fsparam_flag("noblocksend", Opt_noblocksend),
75 fsparam_flag("noautotune", Opt_noautotune),
76 fsparam_flag("nolease", Opt_nolease),
77 fsparam_flag_no("hard", Opt_hard),
78 fsparam_flag_no("soft", Opt_soft),
79 fsparam_flag_no("perm", Opt_perm),
80 fsparam_flag("nodelete", Opt_nodelete),
81 fsparam_flag_no("mapposix", Opt_mapposix),
82 fsparam_flag("mapchars", Opt_mapchars),
83 fsparam_flag("nomapchars", Opt_nomapchars),
84 fsparam_flag_no("sfu", Opt_sfu),
85 fsparam_flag("nodfs", Opt_nodfs),
86 fsparam_flag_no("posixpaths", Opt_posixpaths),
87 fsparam_flag_no("unix", Opt_unix),
88 fsparam_flag_no("linux", Opt_unix),
89 fsparam_flag_no("posix", Opt_unix),
90 fsparam_flag("nocase", Opt_nocase),
91 fsparam_flag("ignorecase", Opt_nocase),
92 fsparam_flag_no("brl", Opt_brl),
93 fsparam_flag_no("handlecache", Opt_handlecache),
94 fsparam_flag("forcemandatorylock", Opt_forcemandatorylock),
95 fsparam_flag("forcemand", Opt_forcemandatorylock),
96 fsparam_flag("setuidfromacl", Opt_setuidfromacl),
97 fsparam_flag("idsfromsid", Opt_setuidfromacl),
98 fsparam_flag_no("setuids", Opt_setuids),
99 fsparam_flag_no("dynperm", Opt_dynperm),
100 fsparam_flag_no("intr", Opt_intr),
101 fsparam_flag_no("strictsync", Opt_strictsync),
102 fsparam_flag_no("serverino", Opt_serverino),
103 fsparam_flag("rwpidforward", Opt_rwpidforward),
104 fsparam_flag("cifsacl", Opt_cifsacl),
105 fsparam_flag_no("acl", Opt_acl),
106 fsparam_flag("locallease", Opt_locallease),
107 fsparam_flag("sign", Opt_sign),
108 fsparam_flag("ignore_signature", Opt_ignore_signature),
109 fsparam_flag("signloosely", Opt_ignore_signature),
110 fsparam_flag("seal", Opt_seal),
111 fsparam_flag("noac", Opt_noac),
112 fsparam_flag("fsc", Opt_fsc),
113 fsparam_flag("mfsymlinks", Opt_mfsymlinks),
114 fsparam_flag("multiuser", Opt_multiuser),
115 fsparam_flag("sloppy", Opt_sloppy),
116 fsparam_flag("nosharesock", Opt_nosharesock),
117 fsparam_flag_no("persistenthandles", Opt_persistent),
118 fsparam_flag_no("resilienthandles", Opt_resilient),
119 fsparam_flag("domainauto", Opt_domainauto),
120 fsparam_flag("rdma", Opt_rdma),
121 fsparam_flag("modesid", Opt_modesid),
122 fsparam_flag("modefromsid", Opt_modesid),
123 fsparam_flag("rootfs", Opt_rootfs),
124 fsparam_flag("compress", Opt_compress),
125 fsparam_flag("witness", Opt_witness),
127 /* Mount options which take numeric value */
128 fsparam_u32("backupuid", Opt_backupuid),
129 fsparam_u32("backupgid", Opt_backupgid),
130 fsparam_u32("uid", Opt_uid),
131 fsparam_u32("cruid", Opt_cruid),
132 fsparam_u32("gid", Opt_gid),
133 fsparam_u32("file_mode", Opt_file_mode),
134 fsparam_u32("dirmode", Opt_dirmode),
135 fsparam_u32("dir_mode", Opt_dirmode),
136 fsparam_u32("port", Opt_port),
137 fsparam_u32("min_enc_offload", Opt_min_enc_offload),
138 fsparam_u32("esize", Opt_min_enc_offload),
139 fsparam_u32("bsize", Opt_blocksize),
140 fsparam_u32("rasize", Opt_rasize),
141 fsparam_u32("rsize", Opt_rsize),
142 fsparam_u32("wsize", Opt_wsize),
143 fsparam_u32("actimeo", Opt_actimeo),
144 fsparam_u32("acdirmax", Opt_acdirmax),
145 fsparam_u32("acregmax", Opt_acregmax),
146 fsparam_u32("echo_interval", Opt_echo_interval),
147 fsparam_u32("max_credits", Opt_max_credits),
148 fsparam_u32("handletimeout", Opt_handletimeout),
149 fsparam_u32("snapshot", Opt_snapshot),
150 fsparam_u32("max_channels", Opt_max_channels),
152 /* Mount options which take string value */
153 fsparam_string("source", Opt_source),
154 fsparam_string("user", Opt_user),
155 fsparam_string("username", Opt_user),
156 fsparam_string("pass", Opt_pass),
157 fsparam_string("password", Opt_pass),
158 fsparam_string("ip", Opt_ip),
159 fsparam_string("addr", Opt_ip),
160 fsparam_string("domain", Opt_domain),
161 fsparam_string("dom", Opt_domain),
162 fsparam_string("srcaddr", Opt_srcaddr),
163 fsparam_string("iocharset", Opt_iocharset),
164 fsparam_string("netbiosname", Opt_netbiosname),
165 fsparam_string("servern", Opt_servern),
166 fsparam_string("ver", Opt_ver),
167 fsparam_string("vers", Opt_vers),
168 fsparam_string("sec", Opt_sec),
169 fsparam_string("cache", Opt_cache),
171 /* Arguments that should be ignored */
172 fsparam_flag("guest", Opt_ignore),
173 fsparam_flag("noatime", Opt_ignore),
174 fsparam_flag("relatime", Opt_ignore),
175 fsparam_flag("_netdev", Opt_ignore),
176 fsparam_flag_no("suid", Opt_ignore),
177 fsparam_flag_no("exec", Opt_ignore),
178 fsparam_flag_no("dev", Opt_ignore),
179 fsparam_flag_no("mand", Opt_ignore),
180 fsparam_flag_no("auto", Opt_ignore),
181 fsparam_string("cred", Opt_ignore),
182 fsparam_string("credentials", Opt_ignore),
184 * UNC and prefixpath is now extracted from Opt_source
185 * in the new mount API so we can just ignore them going forward.
187 fsparam_string("unc", Opt_ignore),
188 fsparam_string("prefixpath", Opt_ignore),
193 cifs_parse_security_flavors(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
196 substring_t args[MAX_OPT_ARGS];
199 * With mount options, the last one should win. Reset any existing
200 * settings back to default.
202 ctx->sectype = Unspecified;
205 switch (match_token(value, cifs_secflavor_tokens, args)) {
207 cifs_errorf(fc, "sec=krb5p is not supported!\n");
213 ctx->sectype = Kerberos;
215 case Opt_sec_ntlmsspi:
218 case Opt_sec_ntlmssp:
219 ctx->sectype = RawNTLMSSP;
227 case Opt_sec_ntlmv2i:
231 ctx->sectype = NTLMv2;
233 #ifdef CONFIG_CIFS_WEAK_PW_HASH
235 ctx->sectype = LANMAN;
242 cifs_errorf(fc, "bad security option: %s\n", value);
249 static const match_table_t cifs_cacheflavor_tokens = {
250 { Opt_cache_loose, "loose" },
251 { Opt_cache_strict, "strict" },
252 { Opt_cache_none, "none" },
253 { Opt_cache_ro, "ro" },
254 { Opt_cache_rw, "singleclient" },
255 { Opt_cache_err, NULL }
259 cifs_parse_cache_flavor(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
261 substring_t args[MAX_OPT_ARGS];
263 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
264 case Opt_cache_loose:
265 ctx->direct_io = false;
266 ctx->strict_io = false;
267 ctx->cache_ro = false;
268 ctx->cache_rw = false;
270 case Opt_cache_strict:
271 ctx->direct_io = false;
272 ctx->strict_io = true;
273 ctx->cache_ro = false;
274 ctx->cache_rw = false;
277 ctx->direct_io = true;
278 ctx->strict_io = false;
279 ctx->cache_ro = false;
280 ctx->cache_rw = false;
283 ctx->direct_io = false;
284 ctx->strict_io = false;
285 ctx->cache_ro = true;
286 ctx->cache_rw = false;
289 ctx->direct_io = false;
290 ctx->strict_io = false;
291 ctx->cache_ro = false;
292 ctx->cache_rw = true;
295 cifs_errorf(fc, "bad cache= option: %s\n", value);
301 #define DUP_CTX_STR(field) \
304 new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC); \
305 if (new_ctx->field == NULL) { \
306 smb3_cleanup_fs_context_contents(new_ctx); \
313 smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx)
315 memcpy(new_ctx, ctx, sizeof(*ctx));
316 new_ctx->prepath = NULL;
317 new_ctx->mount_options = NULL;
318 new_ctx->nodename = NULL;
319 new_ctx->username = NULL;
320 new_ctx->password = NULL;
321 new_ctx->domainname = NULL;
323 new_ctx->source = NULL;
324 new_ctx->iocharset = NULL;
327 * Make sure to stay in sync with smb3_cleanup_fs_context_contents()
329 DUP_CTX_STR(prepath);
330 DUP_CTX_STR(mount_options);
331 DUP_CTX_STR(username);
332 DUP_CTX_STR(password);
335 DUP_CTX_STR(domainname);
336 DUP_CTX_STR(nodename);
337 DUP_CTX_STR(iocharset);
343 cifs_parse_smb_version(struct fs_context *fc, char *value, struct smb3_fs_context *ctx, bool is_smb3)
345 substring_t args[MAX_OPT_ARGS];
347 switch (match_token(value, cifs_smb_version_tokens, args)) {
348 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
350 if (disable_legacy_dialects) {
351 cifs_errorf(fc, "mount with legacy dialect disabled\n");
355 cifs_errorf(fc, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
358 cifs_errorf(fc, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
359 ctx->ops = &smb1_operations;
360 ctx->vals = &smb1_values;
363 if (disable_legacy_dialects) {
364 cifs_errorf(fc, "mount with legacy dialect disabled\n");
368 cifs_errorf(fc, "vers=2.0 not permitted when mounting with smb3\n");
371 ctx->ops = &smb20_operations;
372 ctx->vals = &smb20_values;
376 cifs_errorf(fc, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
379 cifs_errorf(fc, "vers=2.0 mount not permitted when legacy dialects disabled\n");
381 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
383 ctx->ops = &smb21_operations;
384 ctx->vals = &smb21_values;
387 ctx->ops = &smb30_operations;
388 ctx->vals = &smb30_values;
391 ctx->ops = &smb30_operations; /* currently identical with 3.0 */
392 ctx->vals = &smb302_values;
395 ctx->ops = &smb311_operations;
396 ctx->vals = &smb311_values;
399 ctx->ops = &smb30_operations; /* currently identical with 3.0 */
400 ctx->vals = &smb3any_values;
403 ctx->ops = &smb30_operations;
404 ctx->vals = &smbdefault_values;
407 cifs_errorf(fc, "Unknown vers= option specified: %s\n", value);
413 int smb3_parse_opt(const char *options, const char *key, char **val)
416 char *opts, *orig, *p;
418 orig = opts = kstrdup(options, GFP_KERNEL);
422 while ((p = strsep(&opts, ","))) {
427 if (strncasecmp(p, key, strlen(key)))
429 nval = strchr(p, '=');
434 *val = kstrdup(nval, GFP_KERNEL);
435 rc = !*val ? -ENOMEM : 0;
445 * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath
446 * fields with the result. Returns 0 on success and an error otherwise
447 * (e.g. ENOMEM or EINVAL)
450 smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
453 const char *delims = "/\\";
456 if (unlikely(!devname || !*devname)) {
457 cifs_dbg(VFS, "Device name not specified\n");
461 /* make sure we have a valid UNC double delimiter prefix */
462 len = strspn(devname, delims);
466 /* find delimiter between host and sharename */
467 pos = strpbrk(devname + 2, delims);
471 /* skip past delimiter */
474 /* now go until next delimiter or end of string */
475 len = strcspn(pos, delims);
477 /* move "pos" up to delimiter or NULL */
480 ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
484 convert_delimiter(ctx->UNC, '\\');
486 /* skip any delimiter */
487 if (*pos == '/' || *pos == '\\')
493 /* If pos is NULL then no prepath */
497 ctx->prepath = kstrdup(pos, GFP_KERNEL);
504 static void smb3_fs_context_free(struct fs_context *fc);
505 static int smb3_fs_context_parse_param(struct fs_context *fc,
506 struct fs_parameter *param);
507 static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
509 static int smb3_get_tree(struct fs_context *fc);
510 static int smb3_reconfigure(struct fs_context *fc);
512 static const struct fs_context_operations smb3_fs_context_ops = {
513 .free = smb3_fs_context_free,
514 .parse_param = smb3_fs_context_parse_param,
515 .parse_monolithic = smb3_fs_context_parse_monolithic,
516 .get_tree = smb3_get_tree,
517 .reconfigure = smb3_reconfigure,
521 * Parse a monolithic block of data from sys_mount().
522 * smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data
523 * @ctx: The superblock configuration to fill in.
524 * @data: The data to parse
526 * Parse a blob of data that's in key[=val][,key[=val]]* form. This can be
527 * called from the ->monolithic_mount_data() fs_context operation.
529 * Returns 0 on success or the error returned by the ->parse_option() fs_context
530 * operation on failure.
532 static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
535 struct smb3_fs_context *ctx = smb3_fc2context(fc);
536 char *options = data, *key;
542 ctx->mount_options = kstrdup(data, GFP_KERNEL);
543 if (ctx->mount_options == NULL)
546 ret = security_sb_eat_lsm_opts(options, &fc->security);
550 /* BB Need to add support for sep= here TBD */
551 while ((key = strsep(&options, ",")) != NULL) {
558 /* Check if following character is the deliminator If yes,
559 * we have encountered a double deliminator reset the NULL
560 * character to the deliminator
562 while (options && options[0] == ',') {
564 strcpy(key + len, options);
565 options = strchr(options, ',');
572 value = strchr(key, '=');
580 ret = vfs_parse_fs_string(fc, key, value, len);
589 * Validate the preparsed information in the config.
591 static int smb3_fs_context_validate(struct fs_context *fc)
593 struct smb3_fs_context *ctx = smb3_fc2context(fc);
595 if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
596 cifs_errorf(fc, "SMB Direct requires Version >=3.0\n");
601 /* Muliuser mounts require CONFIG_KEYS support */
602 if (ctx->multiuser) {
603 cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
608 if (ctx->got_version == false)
609 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");
613 cifs_errorf(fc, "CIFS mount error: No usable UNC path provided in device string!\n");
617 /* make sure UNC has a share name */
618 if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) {
619 cifs_errorf(fc, "Malformed UNC. Unable to find share name.\n");
627 /* No ip= option specified? Try to get it from UNC */
628 /* Use the address part of the UNC. */
629 slash = strchr(&ctx->UNC[2], '\\');
630 len = slash - &ctx->UNC[2];
631 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
632 &ctx->UNC[2], len)) {
633 pr_err("Unable to determine destination address\n");
634 return -EHOSTUNREACH;
638 /* set the port that we got earlier */
639 cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port);
641 if (ctx->override_uid && !ctx->uid_specified) {
642 ctx->override_uid = 0;
643 pr_notice("ignoring forceuid mount option specified with no uid= option\n");
646 if (ctx->override_gid && !ctx->gid_specified) {
647 ctx->override_gid = 0;
648 pr_notice("ignoring forcegid mount option specified with no gid= option\n");
654 static int smb3_get_tree_common(struct fs_context *fc)
656 struct smb3_fs_context *ctx = smb3_fc2context(fc);
660 root = cifs_smb3_do_mount(fc->fs_type, 0, ctx);
662 return PTR_ERR(root);
670 * Create an SMB3 superblock from the parameters passed.
672 static int smb3_get_tree(struct fs_context *fc)
674 int err = smb3_fs_context_validate(fc);
678 return smb3_get_tree_common(fc);
681 static void smb3_fs_context_free(struct fs_context *fc)
683 struct smb3_fs_context *ctx = smb3_fc2context(fc);
685 smb3_cleanup_fs_context(ctx);
689 * Compare the old and new proposed context during reconfigure
690 * and check if the changes are compatible.
692 static int smb3_verify_reconfigure_ctx(struct fs_context *fc,
693 struct smb3_fs_context *new_ctx,
694 struct smb3_fs_context *old_ctx)
696 if (new_ctx->posix_paths != old_ctx->posix_paths) {
697 cifs_errorf(fc, "can not change posixpaths during remount\n");
700 if (new_ctx->sectype != old_ctx->sectype) {
701 cifs_errorf(fc, "can not change sec during remount\n");
704 if (new_ctx->multiuser != old_ctx->multiuser) {
705 cifs_errorf(fc, "can not change multiuser during remount\n");
709 (!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) {
710 cifs_errorf(fc, "can not change UNC during remount\n");
713 if (new_ctx->username &&
714 (!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) {
715 cifs_errorf(fc, "can not change username during remount\n");
718 if (new_ctx->password &&
719 (!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) {
720 cifs_errorf(fc, "can not change password during remount\n");
723 if (new_ctx->domainname &&
724 (!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) {
725 cifs_errorf(fc, "can not change domainname during remount\n");
728 if (new_ctx->nodename &&
729 (!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) {
730 cifs_errorf(fc, "can not change nodename during remount\n");
733 if (new_ctx->iocharset &&
734 (!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) {
735 cifs_errorf(fc, "can not change iocharset during remount\n");
742 #define STEAL_STRING(cifs_sb, ctx, field) \
745 ctx->field = cifs_sb->ctx->field; \
746 cifs_sb->ctx->field = NULL; \
749 static int smb3_reconfigure(struct fs_context *fc)
751 struct smb3_fs_context *ctx = smb3_fc2context(fc);
752 struct dentry *root = fc->root;
753 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
756 rc = smb3_verify_reconfigure_ctx(fc, ctx, cifs_sb->ctx);
761 * We can not change UNC/username/password/domainname/nodename/iocharset
762 * during reconnect so ignore what we have in the new context and
763 * just use what we already have in cifs_sb->ctx.
765 STEAL_STRING(cifs_sb, ctx, UNC);
766 STEAL_STRING(cifs_sb, ctx, source);
767 STEAL_STRING(cifs_sb, ctx, username);
768 STEAL_STRING(cifs_sb, ctx, password);
769 STEAL_STRING(cifs_sb, ctx, domainname);
770 STEAL_STRING(cifs_sb, ctx, nodename);
771 STEAL_STRING(cifs_sb, ctx, iocharset);
773 /* if rsize or wsize not passed in on remount, use previous values */
775 ctx->rsize = cifs_sb->ctx->rsize;
777 ctx->wsize = cifs_sb->ctx->wsize;
780 smb3_cleanup_fs_context_contents(cifs_sb->ctx);
781 rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
782 smb3_update_mnt_flags(cifs_sb);
787 static int smb3_fs_context_parse_param(struct fs_context *fc,
788 struct fs_parameter *param)
790 struct fs_parse_result result;
791 struct smb3_fs_context *ctx = smb3_fc2context(fc);
793 bool is_smb3 = !strcmp(fc->fs_type->name, "smb3");
794 bool skip_parsing = false;
796 cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key);
799 * fs_parse can not handle string options with an empty value so
800 * we will need special handling of them.
802 if (param->type == fs_value_is_string && param->string[0] == 0) {
803 if (!strcmp("pass", param->key) || !strcmp("password", param->key)) {
806 } else if (!strcmp("user", param->key) || !strcmp("username", param->key)) {
813 opt = fs_parse(fc, smb3_fs_parameters, param, &result);
815 return ctx->sloppy ? 1 : opt;
820 ctx->compression = UNKNOWN_TYPE;
822 "SMB3 compression support is experimental\n");
844 ctx->sfu_remap = false; /* disable SFU mapping */
855 ctx->override_uid = 0;
857 ctx->override_uid = 1;
861 ctx->override_gid = 0;
863 ctx->override_gid = 1;
883 case Opt_noblocksend:
895 case Opt_multichannel:
896 if (result.negated) {
897 ctx->multichannel = false;
898 ctx->max_channels = 1;
900 ctx->multichannel = true;
901 /* if number of channels not specified, default to 2 */
902 if (ctx->max_channels < 2)
903 ctx->max_channels = 2;
907 ctx->linux_uid.val = result.uint_32;
908 ctx->uid_specified = true;
911 ctx->cred_uid.val = result.uint_32;
914 ctx->backupgid.val = result.uint_32;
915 ctx->backupgid_specified = true;
918 ctx->linux_gid.val = result.uint_32;
919 ctx->gid_specified = true;
922 ctx->port = result.uint_32;
925 ctx->file_mode = result.uint_32;
928 ctx->dir_mode = result.uint_32;
930 case Opt_min_enc_offload:
931 ctx->min_offload = result.uint_32;
935 * inode blocksize realistically should never need to be
936 * less than 16K or greater than 16M and default is 1MB.
937 * Note that small inode block sizes (e.g. 64K) can lead
938 * to very poor performance of common tools like cp and scp
940 if ((result.uint_32 < CIFS_MAX_MSGSIZE) ||
941 (result.uint_32 > (4 * SMB3_DEFAULT_IOSIZE))) {
942 cifs_errorf(fc, "%s: Invalid blocksize\n",
944 goto cifs_parse_mount_err;
946 ctx->bsize = result.uint_32;
947 ctx->got_bsize = true;
951 * readahead size realistically should never need to be
952 * less than 1M (CIFS_DEFAULT_IOSIZE) or greater than 32M
953 * (perhaps an exception should be considered in the
954 * for the case of a large number of channels
955 * when multichannel is negotiated) since that would lead
956 * to plenty of parallel I/O in flight to the server.
957 * Note that smaller read ahead sizes would
958 * hurt performance of common tools like cp and scp
959 * which often trigger sequential i/o with read ahead
961 if ((result.uint_32 > (8 * SMB3_DEFAULT_IOSIZE)) ||
962 (result.uint_32 < CIFS_DEFAULT_IOSIZE)) {
963 cifs_errorf(fc, "%s: Invalid rasize %d vs. %d\n",
964 __func__, result.uint_32, SMB3_DEFAULT_IOSIZE);
965 goto cifs_parse_mount_err;
967 ctx->rasize = result.uint_32;
970 ctx->rsize = result.uint_32;
971 ctx->got_rsize = true;
974 ctx->wsize = result.uint_32;
975 ctx->got_wsize = true;
978 ctx->acregmax = HZ * result.uint_32;
979 if (ctx->acregmax > CIFS_MAX_ACTIMEO) {
980 cifs_errorf(fc, "acregmax too large\n");
981 goto cifs_parse_mount_err;
985 ctx->acdirmax = HZ * result.uint_32;
986 if (ctx->acdirmax > CIFS_MAX_ACTIMEO) {
987 cifs_errorf(fc, "acdirmax too large\n");
988 goto cifs_parse_mount_err;
992 if (HZ * result.uint_32 > CIFS_MAX_ACTIMEO) {
993 cifs_errorf(fc, "timeout too large\n");
994 goto cifs_parse_mount_err;
996 if ((ctx->acdirmax != CIFS_DEF_ACTIMEO) ||
997 (ctx->acregmax != CIFS_DEF_ACTIMEO)) {
998 cifs_errorf(fc, "actimeo ignored since acregmax or acdirmax specified\n");
1001 ctx->acdirmax = ctx->acregmax = HZ * result.uint_32;
1003 case Opt_echo_interval:
1004 ctx->echo_interval = result.uint_32;
1007 ctx->snapshot_time = result.uint_32;
1009 case Opt_max_credits:
1010 if (result.uint_32 < 20 || result.uint_32 > 60000) {
1011 cifs_errorf(fc, "%s: Invalid max_credits value\n",
1013 goto cifs_parse_mount_err;
1015 ctx->max_credits = result.uint_32;
1017 case Opt_max_channels:
1018 if (result.uint_32 < 1 || result.uint_32 > CIFS_MAX_CHANNELS) {
1019 cifs_errorf(fc, "%s: Invalid max_channels value, needs to be 1-%d\n",
1020 __func__, CIFS_MAX_CHANNELS);
1021 goto cifs_parse_mount_err;
1023 ctx->max_channels = result.uint_32;
1024 /* If more than one channel requested ... they want multichan */
1025 if (result.uint_32 > 1)
1026 ctx->multichannel = true;
1028 case Opt_handletimeout:
1029 ctx->handle_timeout = result.uint_32;
1030 if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
1031 cifs_errorf(fc, "Invalid handle cache timeout, longer than 16 minutes\n");
1032 goto cifs_parse_mount_err;
1038 switch (smb3_parse_devname(param->string, ctx)) {
1042 cifs_errorf(fc, "Unable to allocate memory for devname\n");
1043 goto cifs_parse_mount_err;
1045 cifs_errorf(fc, "Malformed UNC in devname\n");
1046 goto cifs_parse_mount_err;
1048 cifs_errorf(fc, "Unknown error parsing devname\n");
1049 goto cifs_parse_mount_err;
1051 ctx->source = kstrdup(param->string, GFP_KERNEL);
1052 if (ctx->source == NULL) {
1053 cifs_errorf(fc, "OOM when copying UNC string\n");
1054 goto cifs_parse_mount_err;
1056 fc->source = kstrdup(param->string, GFP_KERNEL);
1057 if (fc->source == NULL) {
1058 cifs_errorf(fc, "OOM when copying UNC string\n");
1059 goto cifs_parse_mount_err;
1063 kfree(ctx->username);
1064 ctx->username = NULL;
1065 if (strlen(param->string) == 0) {
1066 /* null user, ie. anonymous authentication */
1071 if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) >
1072 CIFS_MAX_USERNAME_LEN) {
1073 pr_warn("username too long\n");
1074 goto cifs_parse_mount_err;
1076 ctx->username = kstrdup(param->string, GFP_KERNEL);
1077 if (ctx->username == NULL) {
1078 cifs_errorf(fc, "OOM when copying username string\n");
1079 goto cifs_parse_mount_err;
1083 kfree(ctx->password);
1084 ctx->password = NULL;
1085 if (strlen(param->string) == 0)
1088 ctx->password = kstrdup(param->string, GFP_KERNEL);
1089 if (ctx->password == NULL) {
1090 cifs_errorf(fc, "OOM when copying password string\n");
1091 goto cifs_parse_mount_err;
1095 if (strlen(param->string) == 0) {
1096 ctx->got_ip = false;
1099 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
1101 strlen(param->string))) {
1102 pr_err("bad ip= option (%s)\n", param->string);
1103 goto cifs_parse_mount_err;
1108 if (strnlen(param->string, CIFS_MAX_DOMAINNAME_LEN)
1109 == CIFS_MAX_DOMAINNAME_LEN) {
1110 pr_warn("domain name too long\n");
1111 goto cifs_parse_mount_err;
1114 kfree(ctx->domainname);
1115 ctx->domainname = kstrdup(param->string, GFP_KERNEL);
1116 if (ctx->domainname == NULL) {
1117 cifs_errorf(fc, "OOM when copying domainname string\n");
1118 goto cifs_parse_mount_err;
1120 cifs_dbg(FYI, "Domain name set\n");
1123 if (!cifs_convert_address(
1124 (struct sockaddr *)&ctx->srcaddr,
1125 param->string, strlen(param->string))) {
1126 pr_warn("Could not parse srcaddr: %s\n",
1128 goto cifs_parse_mount_err;
1132 if (strnlen(param->string, 1024) >= 65) {
1133 pr_warn("iocharset name too long\n");
1134 goto cifs_parse_mount_err;
1137 if (strncasecmp(param->string, "default", 7) != 0) {
1138 kfree(ctx->iocharset);
1139 ctx->iocharset = kstrdup(param->string, GFP_KERNEL);
1140 if (ctx->iocharset == NULL) {
1141 cifs_errorf(fc, "OOM when copying iocharset string\n");
1142 goto cifs_parse_mount_err;
1145 /* if iocharset not set then load_nls_default
1148 cifs_dbg(FYI, "iocharset set to %s\n", ctx->iocharset);
1150 case Opt_netbiosname:
1151 memset(ctx->source_rfc1001_name, 0x20,
1154 * FIXME: are there cases in which a comma can
1155 * be valid in workstation netbios name (and
1156 * need special handling)?
1158 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1159 /* don't ucase netbiosname for user */
1160 if (param->string[i] == 0)
1162 ctx->source_rfc1001_name[i] = param->string[i];
1164 /* The string has 16th byte zero still from
1165 * set at top of the function
1167 if (i == RFC1001_NAME_LEN && param->string[i] != 0)
1168 pr_warn("netbiosname longer than 15 truncated\n");
1171 /* last byte, type, is 0x20 for servr type */
1172 memset(ctx->target_rfc1001_name, 0x20,
1173 RFC1001_NAME_LEN_WITH_NULL);
1175 * BB are there cases in which a comma can be valid in this
1176 * workstation netbios name (and need special handling)?
1179 /* user or mount helper must uppercase the netbios name */
1180 for (i = 0; i < 15; i++) {
1181 if (param->string[i] == 0)
1183 ctx->target_rfc1001_name[i] = param->string[i];
1186 /* The string has 16th byte zero still from set at top of function */
1187 if (i == RFC1001_NAME_LEN && param->string[i] != 0)
1188 pr_warn("server netbiosname longer than 15 truncated\n");
1191 /* version of mount userspace tools, not dialect */
1192 /* If interface changes in mount.cifs bump to new ver */
1193 if (strncasecmp(param->string, "1", 1) == 0) {
1194 if (strlen(param->string) > 1) {
1195 pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n",
1197 goto cifs_parse_mount_err;
1199 /* This is the default */
1202 /* For all other value, error */
1203 pr_warn("Invalid mount helper version specified\n");
1204 goto cifs_parse_mount_err;
1206 /* protocol version (dialect) */
1207 if (cifs_parse_smb_version(fc, param->string, ctx, is_smb3) != 0)
1208 goto cifs_parse_mount_err;
1209 ctx->got_version = true;
1212 if (cifs_parse_security_flavors(fc, param->string, ctx) != 0)
1213 goto cifs_parse_mount_err;
1216 if (cifs_parse_cache_flavor(fc, param->string, ctx) != 0)
1217 goto cifs_parse_mount_err;
1220 #ifndef CONFIG_CIFS_SWN_UPCALL
1221 cifs_errorf(fc, "Witness support needs CONFIG_CIFS_SWN_UPCALL config option\n");
1222 goto cifs_parse_mount_err;
1224 ctx->witness = true;
1225 pr_warn_once("Witness protocol support is experimental\n");
1228 #ifndef CONFIG_CIFS_ROOT
1229 cifs_dbg(VFS, "rootfs support requires CONFIG_CIFS_ROOT config option\n");
1230 goto cifs_parse_mount_err;
1234 case Opt_posixpaths:
1236 ctx->posix_paths = 0;
1238 ctx->posix_paths = 1;
1244 ctx->no_linux_ext = 1;
1250 if (result.negated) {
1252 * turn off mandatory locking in mode
1253 * if remote locking is turned off since the
1254 * local vfs will do advisory
1256 if (ctx->file_mode ==
1257 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1258 ctx->file_mode = S_IALLUGO;
1263 case Opt_handlecache:
1265 ctx->nohandlecache = 1;
1267 ctx->nohandlecache = 0;
1269 case Opt_forcemandatorylock:
1273 ctx->setuids = result.negated;
1276 ctx->intr = !result.negated;
1278 case Opt_setuidfromacl:
1279 ctx->setuidfromacl = 1;
1281 case Opt_strictsync:
1282 ctx->nostrictsync = result.negated;
1285 ctx->server_ino = !result.negated;
1287 case Opt_rwpidforward:
1288 ctx->rwpidforward = 1;
1294 ctx->cifs_acl = !result.negated;
1297 ctx->no_psx_acl = result.negated;
1299 case Opt_locallease:
1300 ctx->local_lease = 1;
1305 case Opt_ignore_signature:
1307 ctx->ignore_signature = true;
1310 /* we do not do the following in secFlags because seal
1311 * is a per tree connection (mount) not a per socket
1312 * or per-smb connection option in the protocol
1313 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1318 pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1321 #ifndef CONFIG_CIFS_FSCACHE
1322 cifs_errorf(fc, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1323 goto cifs_parse_mount_err;
1327 case Opt_mfsymlinks:
1328 ctx->mfsymlinks = true;
1331 ctx->multiuser = true;
1336 case Opt_nosharesock:
1337 ctx->nosharesock = true;
1339 case Opt_persistent:
1340 if (result.negated) {
1341 ctx->nopersistent = true;
1342 if (ctx->persistent) {
1343 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1344 goto cifs_parse_mount_err;
1347 ctx->persistent = true;
1348 if ((ctx->nopersistent) || (ctx->resilient)) {
1349 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1350 goto cifs_parse_mount_err;
1355 if (result.negated) {
1356 ctx->resilient = false; /* already the default */
1358 ctx->resilient = true;
1359 if (ctx->persistent) {
1360 cifs_errorf(fc, "persistenthandles mount options conflict\n");
1361 goto cifs_parse_mount_err;
1365 case Opt_domainauto:
1366 ctx->domainauto = true;
1372 /* case Opt_ignore: - is ignored as expected ... */
1376 cifs_parse_mount_err:
1380 int smb3_init_fs_context(struct fs_context *fc)
1382 struct smb3_fs_context *ctx;
1383 char *nodename = utsname()->nodename;
1386 ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
1391 * does not have to be perfect mapping since field is
1392 * informational, only used for servers that do not support
1393 * port 445 and it can be overridden at mount time
1395 memset(ctx->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1396 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1397 ctx->source_rfc1001_name[i] = toupper(nodename[i]);
1399 ctx->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1401 * null target name indicates to use *SMBSERVR default called name
1402 * if we end up sending RFC1001 session initialize
1404 ctx->target_rfc1001_name[0] = 0;
1405 ctx->cred_uid = current_uid();
1406 ctx->linux_uid = current_uid();
1407 ctx->linux_gid = current_gid();
1408 /* By default 4MB read ahead size, 1MB block size */
1409 ctx->bsize = CIFS_DEFAULT_IOSIZE; /* can improve cp performance significantly */
1410 ctx->rasize = 0; /* 0 = use default (ie negotiated rsize) for read ahead pages */
1413 * default to SFM style remapping of seven reserved characters
1414 * unless user overrides it or we negotiate CIFS POSIX where
1415 * it is unnecessary. Can not simultaneously use more than one mapping
1416 * since then readdir could list files that open could not open
1420 /* default to only allowing write access to owner of the mount */
1421 ctx->dir_mode = ctx->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1423 /* ctx->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1424 /* default is always to request posix paths. */
1425 ctx->posix_paths = 1;
1426 /* default to using server inode numbers where available */
1427 ctx->server_ino = 1;
1429 /* default is to use strict cifs caching semantics */
1430 ctx->strict_io = true;
1432 ctx->acregmax = CIFS_DEF_ACTIMEO;
1433 ctx->acdirmax = CIFS_DEF_ACTIMEO;
1435 /* Most clients set timeout to 0, allows server to use its default */
1436 ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
1438 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1439 ctx->ops = &smb30_operations;
1440 ctx->vals = &smbdefault_values;
1442 ctx->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1444 /* default to no multichannel (single server connection) */
1445 ctx->multichannel = false;
1446 ctx->max_channels = 1;
1448 ctx->backupuid_specified = false; /* no backup intent for a user */
1449 ctx->backupgid_specified = false; /* no backup intent for a group */
1452 * short int override_uid = -1;
1453 * short int override_gid = -1;
1454 * char *nodename = strdup(utsname()->nodename);
1455 * struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1458 fc->fs_private = ctx;
1459 fc->ops = &smb3_fs_context_ops;
1464 smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx)
1470 * Make sure this stays in sync with smb3_fs_context_dup()
1472 kfree(ctx->mount_options);
1473 ctx->mount_options = NULL;
1474 kfree(ctx->username);
1475 ctx->username = NULL;
1476 kfree_sensitive(ctx->password);
1477 ctx->password = NULL;
1482 kfree(ctx->domainname);
1483 ctx->domainname = NULL;
1484 kfree(ctx->nodename);
1485 ctx->nodename = NULL;
1486 kfree(ctx->iocharset);
1487 ctx->iocharset = NULL;
1488 kfree(ctx->prepath);
1489 ctx->prepath = NULL;
1493 smb3_cleanup_fs_context(struct smb3_fs_context *ctx)
1497 smb3_cleanup_fs_context_contents(ctx);
1501 void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb)
1503 struct smb3_fs_context *ctx = cifs_sb->ctx;
1506 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
1508 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_DFS;
1511 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
1513 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_PERM;
1516 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
1518 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SET_UID;
1520 if (ctx->setuidfromacl)
1521 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
1523 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UID_FROM_ACL;
1525 if (ctx->server_ino)
1526 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
1528 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
1531 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
1533 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SFM_CHR;
1536 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
1538 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SPECIAL_CHR;
1541 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
1543 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_XATTR;
1546 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
1548 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UNX_EMUL;
1551 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
1553 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_BRL;
1555 if (ctx->nohandlecache)
1556 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
1558 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_HANDLE_CACHE;
1560 if (ctx->nostrictsync)
1561 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
1563 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOSSYNC;
1566 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
1568 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOPOSIXBRL;
1570 if (ctx->rwpidforward)
1571 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
1573 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_RWPIDFORWARD;
1576 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
1578 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MODE_FROM_SID;
1581 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
1583 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_ACL;
1585 if (ctx->backupuid_specified)
1586 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
1588 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPUID;
1590 if (ctx->backupgid_specified)
1591 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
1593 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPGID;
1595 if (ctx->override_uid)
1596 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
1598 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_UID;
1600 if (ctx->override_gid)
1601 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
1603 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_GID;
1606 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
1608 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DYNPERM;
1611 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
1613 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_FSCACHE;
1616 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
1617 CIFS_MOUNT_NO_PERM);
1619 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER;
1623 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
1625 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_STRICT_IO;
1628 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
1630 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DIRECT_IO;
1632 if (ctx->mfsymlinks)
1633 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
1635 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MF_SYMLINKS;
1636 if (ctx->mfsymlinks) {
1637 if (ctx->sfu_emul) {
1639 * Our SFU ("Services for Unix" emulation does not allow
1640 * creating symlinks but does allow reading existing SFU
1641 * symlinks (it does allow both creating and reading SFU
1642 * style mknod and FIFOs though). When "mfsymlinks" and
1643 * "sfu" are both enabled at the same time, it allows
1644 * reading both types of symlinks, but will only create
1645 * them with mfsymlinks format. This allows better
1646 * Apple compatibility (probably better for Samba too)
1647 * while still recognizing old Windows style symlinks.
1649 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
1652 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SHUTDOWN;