vfat and msdos share a common set of options, with additional, unique
options for each filesystem.
Each filesystem calls common fc initialization and parsing routines,
with an "is_vfat" parameter. For parsing, if the option is not found
in the common parameter_spec, parsing is retried with the fs-specific
parameter_spec.
This patch leaves nls loading to fill_super, so the codepage and charset
options are not validated as they are requested. This matches current
behavior. It would be possible to test-load as each option is parsed,
but that would make i.e.
mount -o "iocharset=nope,iocharset=iso8859-1"
fail, where it does not fail today because only the last iocharset
option is considered.
The obsolete "conv=" option is set up with an enum of acceptable values;
currently invalid "conv=" options are rejected as such, even though the
option is obsolete, so this patch preserves that behavior.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
V2: address review comments:
- remove unused buf variable in fat_parse_param
- remove unnecessary externs in new prototypes
- mark deprecated options with fs_param_deprecated
- fix double-free of opts->codepage
- change is_vfat parameters to boolsw
fs/fat/fat.h | 15 +-
fs/fat/inode.c | 683 ++++++++++++++++++++++---------------------
fs/fat/namei_msdos.c | 38 ++-
fs/fat/namei_vfat.c | 38 ++-
4 files changed, 419 insertions(+), 355 deletions(-)
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 37ced7bb06d5..d3e426de5f01 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -7,6 +7,8 @@
#include <linux/hash.h>
#include <linux/ratelimit.h>
#include <linux/msdos_fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
/*
* vfat shortname flags
@@ -416,12 +418,21 @@ extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
extern struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos);
extern int fat_sync_inode(struct inode *inode);
-extern int fat_fill_super(struct super_block *sb, void *data, int silent,
- int isvfat, void (*setup)(struct super_block *));
+extern int fat_fill_super(struct super_block *sb, struct fs_context *fc,
+ void (*setup)(struct super_block *));
extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de);
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2);
+
+extern const struct fs_parameter_spec fat_param_spec[];
+int fat_init_fs_context(struct fs_context *fc, bool is_vfat);
+void fat_free_fc(struct fs_context *fc);
+
+int fat_parse_param(struct fs_context *fc, struct fs_parameter *param,
+ bool is_vfat);
+int fat_reconfigure(struct fs_context *fc);
+
static inline unsigned long fat_dir_hash(int logstart)
{
return hash_32(logstart, FAT_HASH_BITS);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2a6537ba0d49..b83b39f2f69b 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -16,7 +16,6 @@
#include <linux/mpage.h>
#include <linux/vfs.h>
#include <linux/seq_file.h>
-#include <linux/parser.h>
#include <linux/uio.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
@@ -804,16 +803,17 @@ static void __exit fat_destroy_inodecache(void)
kmem_cache_destroy(fat_inode_cachep);
}
-static int fat_remount(struct super_block *sb, int *flags, char *data)
+int fat_reconfigure(struct fs_context *fc)
{
bool new_rdonly;
+ struct super_block *sb = fc->root->d_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- *flags |= SB_NODIRATIME | (sbi->options.isvfat ? 0 : SB_NOATIME);
+ fc->sb_flags |= SB_NODIRATIME | (sbi->options.isvfat ? 0 : SB_NOATIME);
sync_filesystem(sb);
/* make sure we update state on remount. */
- new_rdonly = *flags & SB_RDONLY;
+ new_rdonly = fc->sb_flags & SB_RDONLY;
if (new_rdonly != sb_rdonly(sb)) {
if (new_rdonly)
fat_set_state(sb, 0, 0);
@@ -822,6 +822,7 @@ static int fat_remount(struct super_block *sb, int *flags, char *data)
}
return 0;
}
+EXPORT_SYMBOL_GPL(fat_reconfigure);
static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
{
@@ -939,8 +940,6 @@ static const struct super_operations fat_sops = {
.evict_inode = fat_evict_inode,
.put_super = fat_put_super,
.statfs = fat_statfs,
- .remount_fs = fat_remount,
-
.show_options = fat_show_options,
};
@@ -1037,355 +1036,290 @@ static int fat_show_options(struct seq_file *m, struct dentry *root)
}
enum {
- Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
- Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage,
- Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug,
- Opt_immutable, Opt_dots, Opt_nodots,
- Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
- Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
- Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
- Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
- Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset,
- Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy,
+ Opt_check, Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask,
+ Opt_allow_utime, Opt_codepage, Opt_usefree, Opt_nocase, Opt_quiet,
+ Opt_showexec, Opt_debug, Opt_immutable, Opt_dots, Opt_dotsOK,
+ Opt_charset, Opt_shortname, Opt_utf8, Opt_utf8_bool,
+ Opt_uni_xl, Opt_uni_xl_bool, Opt_nonumtail, Opt_nonumtail_bool,
+ Opt_obsolete, Opt_flush, Opt_tz, Opt_rodir, Opt_errors, Opt_discard,
+ Opt_nfs, Opt_nfs_enum, Opt_time_offset, Opt_dos1xfloppy,
};
-static const match_table_t fat_tokens = {
- {Opt_check_r, "check=relaxed"},
- {Opt_check_s, "check=strict"},
- {Opt_check_n, "check=normal"},
- {Opt_check_r, "check=r"},
- {Opt_check_s, "check=s"},
- {Opt_check_n, "check=n"},
- {Opt_uid, "uid=%u"},
- {Opt_gid, "gid=%u"},
- {Opt_umask, "umask=%o"},
- {Opt_dmask, "dmask=%o"},
- {Opt_fmask, "fmask=%o"},
- {Opt_allow_utime, "allow_utime=%o"},
- {Opt_codepage, "codepage=%u"},
- {Opt_usefree, "usefree"},
- {Opt_nocase, "nocase"},
- {Opt_quiet, "quiet"},
- {Opt_showexec, "showexec"},
- {Opt_debug, "debug"},
- {Opt_immutable, "sys_immutable"},
- {Opt_flush, "flush"},
- {Opt_tz_utc, "tz=UTC"},
- {Opt_time_offset, "time_offset=%d"},
- {Opt_err_cont, "errors=continue"},
- {Opt_err_panic, "errors=panic"},
- {Opt_err_ro, "errors=remount-ro"},
- {Opt_discard, "discard"},
- {Opt_nfs_stale_rw, "nfs"},
- {Opt_nfs_stale_rw, "nfs=stale_rw"},
- {Opt_nfs_nostale_ro, "nfs=nostale_ro"},
- {Opt_dos1xfloppy, "dos1xfloppy"},
- {Opt_obsolete, "conv=binary"},
- {Opt_obsolete, "conv=text"},
- {Opt_obsolete, "conv=auto"},
- {Opt_obsolete, "conv=b"},
- {Opt_obsolete, "conv=t"},
- {Opt_obsolete, "conv=a"},
- {Opt_obsolete, "fat=%u"},
- {Opt_obsolete, "blocksize=%u"},
- {Opt_obsolete, "cvf_format=%20s"},
- {Opt_obsolete, "cvf_options=%100s"},
- {Opt_obsolete, "posix"},
- {Opt_err, NULL},
-};
-static const match_table_t msdos_tokens = {
- {Opt_nodots, "nodots"},
- {Opt_nodots, "dotsOK=no"},
- {Opt_dots, "dots"},
- {Opt_dots, "dotsOK=yes"},
- {Opt_err, NULL}
-};
-static const match_table_t vfat_tokens = {
- {Opt_charset, "iocharset=%s"},
- {Opt_shortname_lower, "shortname=lower"},
- {Opt_shortname_win95, "shortname=win95"},
- {Opt_shortname_winnt, "shortname=winnt"},
- {Opt_shortname_mixed, "shortname=mixed"},
- {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
- {Opt_utf8_no, "utf8=no"},
- {Opt_utf8_no, "utf8=false"},
- {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
- {Opt_utf8_yes, "utf8=yes"},
- {Opt_utf8_yes, "utf8=true"},
- {Opt_utf8_yes, "utf8"},
- {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
- {Opt_uni_xl_no, "uni_xlate=no"},
- {Opt_uni_xl_no, "uni_xlate=false"},
- {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
- {Opt_uni_xl_yes, "uni_xlate=yes"},
- {Opt_uni_xl_yes, "uni_xlate=true"},
- {Opt_uni_xl_yes, "uni_xlate"},
- {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
- {Opt_nonumtail_no, "nonumtail=no"},
- {Opt_nonumtail_no, "nonumtail=false"},
- {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
- {Opt_nonumtail_yes, "nonumtail=yes"},
- {Opt_nonumtail_yes, "nonumtail=true"},
- {Opt_nonumtail_yes, "nonumtail"},
- {Opt_rodir, "rodir"},
- {Opt_err, NULL}
+static const struct constant_table fat_param_check[] = {
+ {"relaxed", 'r'},
+ {"r", 'r'},
+ {"strict", 's'},
+ {"s", 's'},
+ {"normal", 'n'},
+ {"n", 'n'},
+ {}
};
-static int parse_options(struct super_block *sb, char *options, int is_vfat,
- int silent, struct fat_mount_options *opts)
-{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- char *iocharset;
+static const struct constant_table fat_param_tz[] = {
+ {"UTC", 0},
+ {}
+};
- opts->isvfat = is_vfat;
+static const struct constant_table fat_param_errors[] = {
+ {"continue", FAT_ERRORS_CONT},
+ {"panic", FAT_ERRORS_PANIC},
+ {"remount-ro", FAT_ERRORS_RO},
+ {}
+};
- opts->fs_uid = current_uid();
- opts->fs_gid = current_gid();
- opts->fs_fmask = opts->fs_dmask = current_umask();
- opts->allow_utime = -1;
- opts->codepage = fat_default_codepage;
- fat_reset_iocharset(opts);
- if (is_vfat) {
- opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
- opts->rodir = 0;
- } else {
- opts->shortname = 0;
- opts->rodir = 1;
- }
- opts->name_check = 'n';
- opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
- opts->unicode_xlate = 0;
- opts->numtail = 1;
- opts->usefree = opts->nocase = 0;
- opts->tz_set = 0;
- opts->nfs = 0;
- opts->errors = FAT_ERRORS_RO;
- opts->debug = 0;
- opts->utf8 = IS_ENABLED(CONFIG_FAT_DEFAULT_UTF8) && is_vfat;
+static const struct constant_table fat_param_nfs[] = {
+ {"stale_rw", FAT_NFS_STALE_RW},
+ {"nostale_ro", FAT_NFS_NOSTALE_RO},
+ {}
+};
- if (!options)
- goto out;
+/*
+ * These are all obsolete but we still reject invalid options.
+ * The corresponding values are therefore meaningless.
+ */
+static const struct constant_table fat_param_conv[] = {
+ {"binary", 0},
+ {"text", 0},
+ {"auto", 0},
+ {"b", 0},
+ {"t", 0},
+ {"a", 0},
+ {}
+};
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
+/* Core options. See below for vfat and msdos extras */
+const struct fs_parameter_spec fat_param_spec[] = {
+ fsparam_enum ("check", Opt_check, fat_param_check),
+ fsparam_u32 ("uid", Opt_uid),
+ fsparam_u32 ("gid", Opt_gid),
+ fsparam_u32oct ("umask", Opt_umask),
+ fsparam_u32oct ("dmask", Opt_dmask),
+ fsparam_u32oct ("fmask", Opt_fmask),
+ fsparam_u32oct ("allow_utime", Opt_allow_utime),
+ fsparam_u32 ("codepage", Opt_codepage),
+ fsparam_flag ("usefree", Opt_usefree),
+ fsparam_flag ("nocase", Opt_nocase),
+ fsparam_flag ("quiet", Opt_quiet),
+ fsparam_flag ("showexec", Opt_showexec),
+ fsparam_flag ("debug", Opt_debug),
+ fsparam_flag ("sys_immutable", Opt_immutable),
+ fsparam_flag ("flush", Opt_flush),
+ fsparam_enum ("tz", Opt_tz, fat_param_tz),
+ fsparam_s32 ("time_offset", Opt_time_offset),
+ fsparam_enum ("errors", Opt_errors, fat_param_errors),
+ fsparam_flag ("discard", Opt_discard),
+ fsparam_flag ("nfs", Opt_nfs),
+ fsparam_enum ("nfs", Opt_nfs_enum, fat_param_nfs),
+ fsparam_flag ("dos1xfloppy", Opt_dos1xfloppy),
+ __fsparam(fs_param_is_enum, "conv",
+ Opt_obsolete, fs_param_deprecated, fat_param_conv),
+ __fsparam(fs_param_is_u32, "fat",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_u32, "blocksize",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_string, "cvf_format",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_string, "cvf_options",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(NULL, "posix",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ {}
+};
+EXPORT_SYMBOL_GPL(fat_param_spec);
- token = match_token(p, fat_tokens, args);
- if (token == Opt_err) {
- if (is_vfat)
- token = match_token(p, vfat_tokens, args);
- else
- token = match_token(p, msdos_tokens, args);
- }
- switch (token) {
- case Opt_check_s:
- opts->name_check = 's';
- break;
- case Opt_check_r:
- opts->name_check = 'r';
- break;
- case Opt_check_n:
- opts->name_check = 'n';
- break;
- case Opt_usefree:
- opts->usefree = 1;
- break;
- case Opt_nocase:
- if (!is_vfat)
- opts->nocase = 1;
- else {
- /* for backward compatibility */
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- }
- break;
- case Opt_quiet:
- opts->quiet = 1;
- break;
- case Opt_showexec:
- opts->showexec = 1;
- break;
- case Opt_debug:
- opts->debug = 1;
- break;
- case Opt_immutable:
- opts->sys_immutable = 1;
- break;
- case Opt_uid:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->fs_uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(opts->fs_uid))
- return -EINVAL;
- break;
- case Opt_gid:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->fs_gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(opts->fs_gid))
- return -EINVAL;
- break;
- case Opt_umask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_fmask = opts->fs_dmask = option;
- break;
- case Opt_dmask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_dmask = option;
- break;
- case Opt_fmask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_fmask = option;
- break;
- case Opt_allow_utime:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->allow_utime = option & (S_IWGRP | S_IWOTH);
- break;
- case Opt_codepage:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->codepage = option;
- break;
- case Opt_flush:
- opts->flush = 1;
- break;
- case Opt_time_offset:
- if (match_int(&args[0], &option))
- return -EINVAL;
- /*
- * GMT+-12 zones may have DST corrections so at least
- * 13 hours difference is needed. Make the limit 24
- * just in case someone invents something unusual.
- */
- if (option < -24 * 60 || option > 24 * 60)
- return -EINVAL;
- opts->tz_set = 1;
- opts->time_offset = option;
- break;
- case Opt_tz_utc:
- opts->tz_set = 1;
- opts->time_offset = 0;
- break;
- case Opt_err_cont:
- opts->errors = FAT_ERRORS_CONT;
- break;
- case Opt_err_panic:
- opts->errors = FAT_ERRORS_PANIC;
- break;
- case Opt_err_ro:
- opts->errors = FAT_ERRORS_RO;
- break;
- case Opt_nfs_stale_rw:
- opts->nfs = FAT_NFS_STALE_RW;
- break;
- case Opt_nfs_nostale_ro:
- opts->nfs = FAT_NFS_NOSTALE_RO;
- break;
- case Opt_dos1xfloppy:
- opts->dos1xfloppy = 1;
- break;
+static const struct fs_parameter_spec msdos_param_spec[] = {
+ fsparam_flag_no ("dots", Opt_dots),
+ fsparam_bool ("dotsOK", Opt_dotsOK),
+ {}
+};
- /* msdos specific */
- case Opt_dots:
- opts->dotsOK = 1;
- break;
- case Opt_nodots:
- opts->dotsOK = 0;
- break;
+static const struct constant_table fat_param_shortname[] = {
+ {"lower", VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95},
+ {"win95", VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95},
+ {"winnt", VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT},
+ {"mixed", VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95},
+ {}
+};
- /* vfat specific */
- case Opt_charset:
- fat_reset_iocharset(opts);
- iocharset = match_strdup(&args[0]);
- if (!iocharset)
- return -ENOMEM;
- opts->iocharset = iocharset;
- break;
- case Opt_shortname_lower:
- opts->shortname = VFAT_SFN_DISPLAY_LOWER
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_shortname_win95:
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_shortname_winnt:
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WINNT;
- break;
- case Opt_shortname_mixed:
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_utf8_no: /* 0 or no or false */
- opts->utf8 = 0;
- break;
- case Opt_utf8_yes: /* empty or 1 or yes or true */
- opts->utf8 = 1;
- break;
- case Opt_uni_xl_no: /* 0 or no or false */
- opts->unicode_xlate = 0;
- break;
- case Opt_uni_xl_yes: /* empty or 1 or yes or true */
- opts->unicode_xlate = 1;
- break;
- case Opt_nonumtail_no: /* 0 or no or false */
- opts->numtail = 1; /* negated option */
- break;
- case Opt_nonumtail_yes: /* empty or 1 or yes or true */
- opts->numtail = 0; /* negated option */
- break;
- case Opt_rodir:
- opts->rodir = 1;
- break;
- case Opt_discard:
- opts->discard = 1;
- break;
+static const struct fs_parameter_spec vfat_param_spec[] = {
+ fsparam_string ("iocharset", Opt_charset),
+ fsparam_enum ("shortname", Opt_shortname, fat_param_shortname),
+ fsparam_flag ("utf8", Opt_utf8),
+ fsparam_bool ("utf8", Opt_utf8_bool),
+ fsparam_flag ("uni_xlate", Opt_uni_xl),
+ fsparam_bool ("uni_xlate", Opt_uni_xl_bool),
+ fsparam_flag ("nonumtail", Opt_nonumtail),
+ fsparam_bool ("nonumtail", Opt_nonumtail_bool),
+ fsparam_flag ("rodir", Opt_rodir),
+ {}
+};
- /* obsolete mount options */
- case Opt_obsolete:
- fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, "
- "not supported now", p);
- break;
- /* unknown option */
- default:
- if (!silent) {
- fat_msg(sb, KERN_ERR,
- "Unrecognized mount option \"%s\" "
- "or missing value", p);
- }
- return -EINVAL;
- }
- }
+int fat_parse_param(struct fs_context *fc, struct fs_parameter *param,
+ bool is_vfat)
+{
+ struct fat_mount_options *opts = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
+ kuid_t uid;
+ kgid_t gid;
+
+ /* remount options have traditionally been ignored */
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
+ return 0;
-out:
- /* UTF-8 doesn't provide FAT semantics */
- if (!strcmp(opts->iocharset, "utf8")) {
- fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
- " for FAT filesystems, filesystem will be "
- "case sensitive!");
+ opt = fs_parse(fc, fat_param_spec, param, &result);
+ /* If option not found in fat_param_spec, try vfat/msdos options */
+ if (opt == -ENOPARAM) {
+ if (is_vfat)
+ opt = fs_parse(fc, vfat_param_spec, param, &result);
+ else
+ opt = fs_parse(fc, msdos_param_spec, param, &result);
}
- /* If user doesn't specify allow_utime, it's initialized from dmask. */
- if (opts->allow_utime == (unsigned short)-1)
- opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
- if (opts->unicode_xlate)
- opts->utf8 = 0;
- if (opts->nfs == FAT_NFS_NOSTALE_RO) {
- sb->s_flags |= SB_RDONLY;
- sb->s_export_op = &fat_export_ops_nostale;
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_check:
+ opts->name_check = result.uint_32;
+ break;
+ case Opt_usefree:
+ opts->usefree = 1;
+ break;
+ case Opt_nocase:
+ if (!is_vfat)
+ opts->nocase = 1;
+ else {
+ /* for backward compatibility */
+ opts->shortname = VFAT_SFN_DISPLAY_WIN95
+ | VFAT_SFN_CREATE_WIN95;
+ }
+ break;
+ case Opt_quiet:
+ opts->quiet = 1;
+ break;
+ case Opt_showexec:
+ opts->showexec = 1;
+ break;
+ case Opt_debug:
+ opts->debug = 1;
+ break;
+ case Opt_immutable:
+ opts->sys_immutable = 1;
+ break;
+ case Opt_uid:
+ uid = make_kuid(current_user_ns(), result.uint_32);
+ if (!uid_valid(uid))
+ return -EINVAL;
+ opts->fs_uid = uid;
+ break;
+ case Opt_gid:
+ gid = make_kgid(current_user_ns(), result.uint_32);
+ if (!gid_valid(gid))
+ return -EINVAL;
+ opts->fs_gid = gid;
+ break;
+ case Opt_umask:
+ opts->fs_fmask = opts->fs_dmask = result.uint_32;
+ break;
+ case Opt_dmask:
+ opts->fs_dmask = result.uint_32;
+ break;
+ case Opt_fmask:
+ opts->fs_fmask = result.uint_32;
+ break;
+ case Opt_allow_utime:
+ opts->allow_utime = result.uint_32 & (S_IWGRP | S_IWOTH);
+ break;
+ case Opt_codepage:
+ opts->codepage = result.uint_32;
+ break;
+ case Opt_flush:
+ opts->flush = 1;
+ break;
+ case Opt_time_offset:
+ /*
+ * GMT+-12 zones may have DST corrections so at least
+ * 13 hours difference is needed. Make the limit 24
+ * just in case someone invents something unusual.
+ */
+ if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60)
+ return -EINVAL;
+ opts->tz_set = 1;
+ opts->time_offset = result.int_32;
+ break;
+ case Opt_tz:
+ opts->tz_set = 1;
+ opts->time_offset = result.uint_32;
+ break;
+ case Opt_errors:
+ opts->errors = result.uint_32;
+ break;
+ case Opt_nfs:
+ opts->nfs = FAT_NFS_STALE_RW;
+ break;
+ case Opt_nfs_enum:
+ opts->nfs = result.uint_32;
+ break;
+ case Opt_dos1xfloppy:
+ opts->dos1xfloppy = 1;
+ break;
+
+ /* msdos specific */
+ case Opt_dots: /* dots / nodots */
+ opts->dotsOK = !result.negated;
+ break;
+ case Opt_dotsOK: /* dotsOK = yes/no */
+ opts->dotsOK = result.boolean;
+ break;
+
+ /* vfat specific */
+ case Opt_charset:
+ fat_reset_iocharset(opts);
+ opts->iocharset = param->string;
+ param->string = NULL; /* Steal string */
+ break;
+ case Opt_shortname:
+ opts->shortname = result.uint_32;
+ break;
+ case Opt_utf8:
+ opts->utf8 = 1;
+ break;
+ case Opt_utf8_bool:
+ opts->utf8 = result.boolean;
+ break;
+ case Opt_uni_xl:
+ opts->unicode_xlate = 1;
+ break;
+ case Opt_uni_xl_bool:
+ opts->unicode_xlate = result.boolean;
+ break;
+ case Opt_nonumtail:
+ opts->numtail = 0; /* negated option */
+ break;
+ case Opt_nonumtail_bool:
+ opts->numtail = !result.boolean; /* negated option */
+ break;
+ case Opt_rodir:
+ opts->rodir = 1;
+ break;
+ case Opt_discard:
+ opts->discard = 1;
+ break;
+
+ /* obsolete mount options */
+ case Opt_obsolete:
+ printk(KERN_INFO "FAT-fs: \"%s\" option is obsolete, "
+ "not supported now", param->key);
+ break;
+ default:
+ return -EINVAL;
}
return 0;
}
+EXPORT_SYMBOL_GPL(fat_parse_param);
static int fat_read_root(struct inode *inode)
{
@@ -1604,9 +1538,11 @@ static int fat_read_static_bpb(struct super_block *sb,
/*
* Read the super block of an MS-DOS FS.
*/
-int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
+int fat_fill_super(struct super_block *sb, struct fs_context *fc,
void (*setup)(struct super_block *))
{
+ struct fat_mount_options *opts = fc->fs_private;
+ int silent = fc->sb_flags & SB_SILENT;
struct inode *root_inode = NULL, *fat_inode = NULL;
struct inode *fsinfo_inode = NULL;
struct buffer_head *bh;
@@ -1642,9 +1578,27 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
- error = parse_options(sb, data, isvfat, silent, &sbi->options);
- if (error)
- goto out_fail;
+ /* UTF-8 doesn't provide FAT semantics */
+ if (!strcmp(opts->iocharset, "utf8")) {
+ fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
+ " for FAT filesystems, filesystem will be"
+ " case sensitive!");
+ }
+
+ /* If user doesn't specify allow_utime, it's initialized from dmask. */
+ if (opts->allow_utime == (unsigned short)-1)
+ opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
+ if (opts->unicode_xlate)
+ opts->utf8 = 0;
+ if (opts->nfs == FAT_NFS_NOSTALE_RO) {
+ sb->s_flags |= SB_RDONLY;
+ sb->s_export_op = &fat_export_ops_nostale;
+ }
+
+ /* Apply parsed options to sbi (structure copy) */
+ sbi->options = *opts;
+ /* Transfer ownership of iocharset to sbi->options */
+ opts->iocharset = NULL;
setup(sb); /* flavour-specific stuff that needs options */
@@ -1949,6 +1903,57 @@ int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
}
EXPORT_SYMBOL_GPL(fat_flush_inodes);
+int fat_init_fs_context(struct fs_context *fc, bool is_vfat)
+{
+ struct fat_mount_options *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+
+ opts->isvfat = is_vfat;
+ opts->fs_uid = current_uid();
+ opts->fs_gid = current_gid();
+ opts->fs_fmask = opts->fs_dmask = current_umask();
+ opts->allow_utime = -1;
+ opts->codepage = fat_default_codepage;
+ fat_reset_iocharset(opts);
+ if (is_vfat) {
+ opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
+ opts->rodir = 0;
+ } else {
+ opts->shortname = 0;
+ opts->rodir = 1;
+ }
+ opts->name_check = 'n';
+ opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
+ opts->unicode_xlate = 0;
+ opts->numtail = 1;
+ opts->usefree = opts->nocase = 0;
+ opts->tz_set = 0;
+ opts->nfs = 0;
+ opts->errors = FAT_ERRORS_RO;
+ opts->debug = 0;
+
+ opts->utf8 = IS_ENABLED(CONFIG_FAT_DEFAULT_UTF8) && is_vfat;
+
+ fc->fs_private = opts;
+ /* fc->ops assigned by caller */
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fat_init_fs_context);
+
+void fat_free_fc(struct fs_context *fc)
+{
+ struct fat_mount_options *opts = fc->fs_private;
+
+ if (opts->iocharset != fat_default_iocharset)
+ kfree(opts->iocharset);
+ kfree(fc->fs_private);
+}
+EXPORT_SYMBOL_GPL(fat_free_fc);
+
static int __init init_fat_fs(void)
{
int err;
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 2116c486843b..f06f6ba643cc 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -650,24 +650,48 @@ static void setup(struct super_block *sb)
sb->s_flags |= SB_NOATIME;
}
-static int msdos_fill_super(struct super_block *sb, void *data, int silent)
+static int msdos_fill_super(struct super_block *sb, struct fs_context *fc)
{
- return fat_fill_super(sb, data, silent, 0, setup);
+ return fat_fill_super(sb, fc, setup);
}
-static struct dentry *msdos_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int msdos_get_tree(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
+ return get_tree_bdev(fc, msdos_fill_super);
+}
+
+static int msdos_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ return fat_parse_param(fc, param, false);
+}
+
+static const struct fs_context_operations msdos_context_ops = {
+ .parse_param = msdos_parse_param,
+ .get_tree = msdos_get_tree,
+ .reconfigure = fat_reconfigure,
+ .free = fat_free_fc,
+};
+
+static int msdos_init_fs_context(struct fs_context *fc)
+{
+ int err;
+
+ /* Initialize with is_vfat == false */
+ err = fat_init_fs_context(fc, false);
+ if (err)
+ return err;
+
+ fc->ops = &msdos_context_ops;
+ return 0;
}
static struct file_system_type msdos_fs_type = {
.owner = THIS_MODULE,
.name = "msdos",
- .mount = msdos_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+ .init_fs_context = msdos_init_fs_context,
+ .parameters = fat_param_spec,
};
MODULE_ALIAS_FS("msdos");
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index c4d00999a433..6423e1dedf14 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -1195,24 +1195,48 @@ static void setup(struct super_block *sb)
sb->s_d_op = &vfat_dentry_ops;
}
-static int vfat_fill_super(struct super_block *sb, void *data, int silent)
+static int vfat_fill_super(struct super_block *sb, struct fs_context *fc)
{
- return fat_fill_super(sb, data, silent, 1, setup);
+ return fat_fill_super(sb, fc, setup);
}
-static struct dentry *vfat_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int vfat_get_tree(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
+ return get_tree_bdev(fc, vfat_fill_super);
+}
+
+static int vfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ return fat_parse_param(fc, param, true);
+}
+
+static const struct fs_context_operations vfat_context_ops = {
+ .parse_param = vfat_parse_param,
+ .get_tree = vfat_get_tree,
+ .reconfigure = fat_reconfigure,
+ .free = fat_free_fc,
+};
+
+static int vfat_init_fs_context(struct fs_context *fc)
+{
+ int err;
+
+ /* Initialize with is_vfat == true */
+ err = fat_init_fs_context(fc, true);
+ if (err)
+ return err;
+
+ fc->ops = &vfat_context_ops;
+ return 0;
}
static struct file_system_type vfat_fs_type = {
.owner = THIS_MODULE,
.name = "vfat",
- .mount = vfat_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+ .init_fs_context = vfat_init_fs_context,
+ .parameters = fat_param_spec,
};
MODULE_ALIAS_FS("vfat");
--
2.45.2
