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fat: Convert to new mount api

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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option is obsolete, so this patch preserves that behavior.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@redhat.com>
Link: https://lore.kernel.org/r/a9411b02-5f8e-4e1e-90aa-0c032d66c312@redhat.com
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Eric Sandeen 2024-07-02 17:44:27 -05:00 committed by Christian Brauner
parent 206d3d8e00
commit 634440b69c
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
4 changed files with 421 additions and 357 deletions
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15
fs/fat/fat.h
View File

@ -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);

687
fs/fat/inode.c
View File

@ -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)
static const struct constant_table fat_param_tz[] = {
{"UTC", 0},
{}
};
static const struct constant_table fat_param_errors[] = {
{"continue", FAT_ERRORS_CONT},
{"panic", FAT_ERRORS_PANIC},
{"remount-ro", FAT_ERRORS_RO},
{}
};
static const struct constant_table fat_param_nfs[] = {
{"stale_rw", FAT_NFS_STALE_RW},
{"nostale_ro", FAT_NFS_NOSTALE_RO},
{}
};
/*
* 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},
{}
};
/* 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);
static const struct fs_parameter_spec msdos_param_spec[] = {
fsparam_flag_no ("dots", Opt_dots),
fsparam_bool ("dotsOK", Opt_dotsOK),
{}
};
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},
{}
};
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),
{}
};
int fat_parse_param(struct fs_context *fc, struct fs_parameter *param,
bool is_vfat)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
char *iocharset;
struct fat_mount_options *opts = fc->fs_private;
struct fs_parse_result result;
int opt;
kuid_t uid;
kgid_t gid;
opts->isvfat = is_vfat;
/* remount options have traditionally been ignored */
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
return 0;
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;
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);
}
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;
if (opt < 0)
return opt;
if (!options)
goto out;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
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;
/* msdos specific */
case Opt_dots:
opts->dotsOK = 1;
break;
case Opt_nodots:
opts->dotsOK = 0;
break;
/* 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:
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_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;
/* 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;
| 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;
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!");
}
/* msdos specific */
case Opt_dots: /* dots / nodots */
opts->dotsOK = !result.negated;
break;
case Opt_dotsOK: /* dotsOK = yes/no */
opts->dotsOK = result.boolean;
break;
/* 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;
/* 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 @@ out:
/*
* 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;

38
fs/fat/namei_msdos.c
View File

@ -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");

38
fs/fat/namei_vfat.c
View File

@ -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");