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Message-ID: <20250223201014.7541-2-sandeen@redhat.com>
Date: Sun, 23 Feb 2025 13:57:40 -0600
From: Eric Sandeen <sandeen@...hat.com>
To: jack@...e.com
Cc: linux-ext4@...r.kernel.org,
Eric Sandeen <sandeen@...hat.com>
Subject: [PATCH 1/2] ext2: convert to the new mount API
Convert ext2 to the new mount API.
Note that this makes the sb= option more accepting than it was before;
previosly, sb= was only accepted if it was the first specified option.
Now it can exist anywhere, and if respecified, the last specified value
is used.
Parse-time messages here are sent to ext2_msg with a NULL sb, and
ext2_msg is adjusted to accept that, as ext4 does today as well.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
fs/ext2/ext2.h | 1 +
fs/ext2/super.c | 571 ++++++++++++++++++++++++++----------------------
2 files changed, 310 insertions(+), 262 deletions(-)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index f38bdd46e4f7..4025f875252a 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -368,6 +368,7 @@ struct ext2_inode {
#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
+#define EXT2_MOUNT_ERRORS_MASK 0x000070
#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 37f7ce56adce..cb6253656eb2 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -23,7 +23,8 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
-#include <linux/parser.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include <linux/random.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
@@ -40,7 +41,6 @@
#include "acl.h"
static void ext2_write_super(struct super_block *sb);
-static int ext2_remount (struct super_block * sb, int * flags, char * data);
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
static int ext2_sync_fs(struct super_block *sb, int wait);
static int ext2_freeze(struct super_block *sb);
@@ -92,7 +92,10 @@ void ext2_msg(struct super_block *sb, const char *prefix,
vaf.fmt = fmt;
vaf.va = &args;
- printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+ if (sb)
+ printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+ else
+ printk("%sEXT2-fs: %pV\n", prefix, &vaf);
va_end(args);
}
@@ -346,7 +349,6 @@ static const struct super_operations ext2_sops = {
.freeze_fs = ext2_freeze,
.unfreeze_fs = ext2_unfreeze,
.statfs = ext2_statfs,
- .remount_fs = ext2_remount,
.show_options = ext2_show_options,
#ifdef CONFIG_QUOTA
.quota_read = ext2_quota_read,
@@ -402,230 +404,217 @@ static const struct export_operations ext2_export_ops = {
.get_parent = ext2_get_parent,
};
-static unsigned long get_sb_block(void **data)
-{
- unsigned long sb_block;
- char *options = (char *) *data;
-
- if (!options || strncmp(options, "sb=", 3) != 0)
- return 1; /* Default location */
- options += 3;
- sb_block = simple_strtoul(options, &options, 0);
- if (*options && *options != ',') {
- printk("EXT2-fs: Invalid sb specification: %s\n",
- (char *) *data);
- return 1;
- }
- if (*options == ',')
- options++;
- *data = (void *) options;
- return sb_block;
-}
-
enum {
- Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
- Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
- Opt_err_ro, Opt_nouid32, Opt_debug,
- Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
- Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
- Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
+ Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, Opt_resgid, Opt_resuid,
+ Opt_sb, Opt_errors, Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
+ Opt_nobh, Opt_user_xattr, Opt_acl, Opt_xip, Opt_dax, Opt_ignore,
+ Opt_quota, Opt_usrquota, Opt_grpquota, Opt_reservation,
+};
+
+static const struct constant_table ext2_param_errors[] = {
+ {"continue", EXT2_MOUNT_ERRORS_CONT},
+ {"panic", EXT2_MOUNT_ERRORS_PANIC},
+ {"remount-ro", EXT2_MOUNT_ERRORS_RO},
+ {}
+};
+
+const struct fs_parameter_spec ext2_param_spec[] = {
+ fsparam_flag ("bsddf", Opt_bsd_df),
+ fsparam_flag ("minixdf", Opt_minix_df),
+ fsparam_flag ("grpid", Opt_grpid),
+ fsparam_flag ("bsdgroups", Opt_grpid),
+ fsparam_flag ("nogrpid", Opt_nogrpid),
+ fsparam_flag ("sysvgroups", Opt_nogrpid),
+ fsparam_gid ("resgid", Opt_resgid),
+ fsparam_uid ("resuid", Opt_resuid),
+ fsparam_u32 ("sb", Opt_sb),
+ fsparam_enum ("errors", Opt_errors, ext2_param_errors),
+ fsparam_flag ("nouid32", Opt_nouid32),
+ fsparam_flag ("debug", Opt_debug),
+ fsparam_flag ("oldalloc", Opt_oldalloc),
+ fsparam_flag ("orlov", Opt_orlov),
+ fsparam_flag ("nobh", Opt_nobh),
+ fsparam_flag_no ("user_xattr", Opt_user_xattr),
+ fsparam_flag_no ("acl", Opt_acl),
+ fsparam_flag ("xip", Opt_xip),
+ fsparam_flag ("dax", Opt_dax),
+ fsparam_flag ("grpquota", Opt_grpquota),
+ fsparam_flag ("noquota", Opt_ignore),
+ fsparam_flag ("quota", Opt_quota),
+ fsparam_flag ("usrquota", Opt_usrquota),
+ fsparam_flag_no ("reservation", Opt_reservation),
+ {}
};
-static const match_table_t tokens = {
- {Opt_bsd_df, "bsddf"},
- {Opt_minix_df, "minixdf"},
- {Opt_grpid, "grpid"},
- {Opt_grpid, "bsdgroups"},
- {Opt_nogrpid, "nogrpid"},
- {Opt_nogrpid, "sysvgroups"},
- {Opt_resgid, "resgid=%u"},
- {Opt_resuid, "resuid=%u"},
- {Opt_sb, "sb=%u"},
- {Opt_err_cont, "errors=continue"},
- {Opt_err_panic, "errors=panic"},
- {Opt_err_ro, "errors=remount-ro"},
- {Opt_nouid32, "nouid32"},
- {Opt_debug, "debug"},
- {Opt_oldalloc, "oldalloc"},
- {Opt_orlov, "orlov"},
- {Opt_nobh, "nobh"},
- {Opt_user_xattr, "user_xattr"},
- {Opt_nouser_xattr, "nouser_xattr"},
- {Opt_acl, "acl"},
- {Opt_noacl, "noacl"},
- {Opt_xip, "xip"},
- {Opt_dax, "dax"},
- {Opt_grpquota, "grpquota"},
- {Opt_ignore, "noquota"},
- {Opt_quota, "quota"},
- {Opt_usrquota, "usrquota"},
- {Opt_reservation, "reservation"},
- {Opt_noreservation, "noreservation"},
- {Opt_err, NULL}
+#define EXT2_SPEC_s_resuid (1 << 0)
+#define EXT2_SPEC_s_resgid (1 << 1)
+
+struct ext2_fs_context {
+ unsigned long vals_s_flags; /* Bits to set in s_flags */
+ unsigned long mask_s_flags; /* Bits changed in s_flags */
+ unsigned int vals_s_mount_opt;
+ unsigned int mask_s_mount_opt;
+ kuid_t s_resuid;
+ kgid_t s_resgid;
+ unsigned long s_sb_block;
+ unsigned int spec;
+
};
-static int parse_options(char *options, struct super_block *sb,
- struct ext2_mount_options *opts)
+static inline void ctx_set_mount_opt(struct ext2_fs_context *ctx,
+ unsigned long flag)
+{
+ ctx->mask_s_mount_opt |= flag;
+ ctx->vals_s_mount_opt |= flag;
+}
+
+static inline void ctx_clear_mount_opt(struct ext2_fs_context *ctx,
+ unsigned long flag)
+{
+ ctx->mask_s_mount_opt |= flag;
+ ctx->vals_s_mount_opt &= ~flag;
+}
+
+static inline unsigned long
+ctx_test_mount_opt(struct ext2_fs_context *ctx, unsigned long flag)
+{
+ return (ctx->vals_s_mount_opt & flag);
+}
+
+static inline bool
+ctx_parsed_mount_opt(struct ext2_fs_context *ctx, unsigned long flag)
+{
+ return (ctx->mask_s_mount_opt & flag);
+}
+
+static void ext2_free_fc(struct fs_context *fc)
{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- kuid_t uid;
- kgid_t gid;
-
- if (!options)
- return 1;
-
- while ((p = strsep (&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_bsd_df:
- clear_opt (opts->s_mount_opt, MINIX_DF);
- break;
- case Opt_minix_df:
- set_opt (opts->s_mount_opt, MINIX_DF);
- break;
- case Opt_grpid:
- set_opt (opts->s_mount_opt, GRPID);
- break;
- case Opt_nogrpid:
- clear_opt (opts->s_mount_opt, GRPID);
- break;
- case Opt_resuid:
- if (match_int(&args[0], &option))
- return 0;
- uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(uid)) {
- ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
- return 0;
-
- }
- opts->s_resuid = uid;
- break;
- case Opt_resgid:
- if (match_int(&args[0], &option))
- return 0;
- gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(gid)) {
- ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
- return 0;
- }
- opts->s_resgid = gid;
- break;
- case Opt_sb:
- /* handled by get_sb_block() instead of here */
- /* *sb_block = match_int(&args[0]); */
- break;
- case Opt_err_panic:
- clear_opt (opts->s_mount_opt, ERRORS_CONT);
- clear_opt (opts->s_mount_opt, ERRORS_RO);
- set_opt (opts->s_mount_opt, ERRORS_PANIC);
- break;
- case Opt_err_ro:
- clear_opt (opts->s_mount_opt, ERRORS_CONT);
- clear_opt (opts->s_mount_opt, ERRORS_PANIC);
- set_opt (opts->s_mount_opt, ERRORS_RO);
- break;
- case Opt_err_cont:
- clear_opt (opts->s_mount_opt, ERRORS_RO);
- clear_opt (opts->s_mount_opt, ERRORS_PANIC);
- set_opt (opts->s_mount_opt, ERRORS_CONT);
- break;
- case Opt_nouid32:
- set_opt (opts->s_mount_opt, NO_UID32);
- break;
- case Opt_debug:
- set_opt (opts->s_mount_opt, DEBUG);
- break;
- case Opt_oldalloc:
- set_opt (opts->s_mount_opt, OLDALLOC);
- break;
- case Opt_orlov:
- clear_opt (opts->s_mount_opt, OLDALLOC);
- break;
- case Opt_nobh:
- ext2_msg(sb, KERN_INFO,
- "nobh option not supported");
- break;
+ kfree(fc->fs_private);
+}
+
+static int ext2_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct ext2_fs_context *ctx = fc->fs_private;
+ int opt;
+ struct fs_parse_result result;
+
+ opt = fs_parse(fc, ext2_param_spec, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_bsd_df:
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_MINIX_DF);
+ break;
+ case Opt_minix_df:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_MINIX_DF);
+ break;
+ case Opt_grpid:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPID);
+ break;
+ case Opt_nogrpid:
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_GRPID);
+ break;
+ case Opt_resuid:
+ ctx->s_resuid = result.uid;
+ ctx->spec |= EXT2_SPEC_s_resuid;
+ break;
+ case Opt_resgid:
+ ctx->s_resgid = result.gid;
+ ctx->spec |= EXT2_SPEC_s_resgid;
+ break;
+ case Opt_sb:
+ /* Note that this is silently ignored on remount */
+ ctx->s_sb_block = result.uint_32;
+ break;
+ case Opt_errors:
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK);
+ ctx_set_mount_opt(ctx, result.uint_32);
+ break;
+ case Opt_nouid32:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_NO_UID32);
+ break;
+ case Opt_debug:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_DEBUG);
+ break;
+ case Opt_oldalloc:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_OLDALLOC);
+ break;
+ case Opt_orlov:
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_OLDALLOC);
+ break;
+ case Opt_nobh:
+ ext2_msg(NULL, KERN_INFO, "nobh option not supported\n");
+ break;
#ifdef CONFIG_EXT2_FS_XATTR
- case Opt_user_xattr:
- set_opt (opts->s_mount_opt, XATTR_USER);
- break;
- case Opt_nouser_xattr:
- clear_opt (opts->s_mount_opt, XATTR_USER);
- break;
+ case Opt_user_xattr:
+ if (!result.negated)
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_XATTR_USER);
+ else
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_XATTR_USER);
+ break;
#else
- case Opt_user_xattr:
- case Opt_nouser_xattr:
- ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
- "not supported");
- break;
+ case Opt_user_xattr:
+ ext2_msg(NULL, KERN_INFO, "(no)user_xattr options not supported");
+ break;
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
- case Opt_acl:
- set_opt(opts->s_mount_opt, POSIX_ACL);
- break;
- case Opt_noacl:
- clear_opt(opts->s_mount_opt, POSIX_ACL);
- break;
+ case Opt_acl:
+ if (!result.negated)
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL);
+ else
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL);
+ break;
#else
- case Opt_acl:
- case Opt_noacl:
- ext2_msg(sb, KERN_INFO,
- "(no)acl options not supported");
- break;
+ case Opt_acl:
+ ext2_msg(NULL, KERN_INFO, "(no)acl options not supported");
+ break;
#endif
- case Opt_xip:
- ext2_msg(sb, KERN_INFO, "use dax instead of xip");
- set_opt(opts->s_mount_opt, XIP);
- fallthrough;
- case Opt_dax:
+ case Opt_xip:
+ ext2_msg(NULL, KERN_INFO, "use dax instead of xip");
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_XIP);
+ fallthrough;
+ case Opt_dax:
#ifdef CONFIG_FS_DAX
- ext2_msg(sb, KERN_WARNING,
- "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
- set_opt(opts->s_mount_opt, DAX);
+ ext2_msg(NULL, KERN_WARNING,
+ "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_DAX);
#else
- ext2_msg(sb, KERN_INFO, "dax option not supported");
+ ext2_msg(NULL, KERN_INFO, "dax option not supported");
#endif
- break;
+ break;
#if defined(CONFIG_QUOTA)
- case Opt_quota:
- case Opt_usrquota:
- set_opt(opts->s_mount_opt, USRQUOTA);
- break;
-
- case Opt_grpquota:
- set_opt(opts->s_mount_opt, GRPQUOTA);
- break;
+ case Opt_quota:
+ case Opt_usrquota:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_USRQUOTA);
+ break;
+
+ case Opt_grpquota:
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPQUOTA);
+ break;
#else
- case Opt_quota:
- case Opt_usrquota:
- case Opt_grpquota:
- ext2_msg(sb, KERN_INFO,
- "quota operations not supported");
- break;
+ case Opt_quota:
+ case Opt_usrquota:
+ case Opt_grpquota:
+ ext2_msg(NULL, KERN_INFO, "quota operations not supported");
+ break;
#endif
-
- case Opt_reservation:
- set_opt(opts->s_mount_opt, RESERVATION);
- ext2_msg(sb, KERN_INFO, "reservations ON");
- break;
- case Opt_noreservation:
- clear_opt(opts->s_mount_opt, RESERVATION);
- ext2_msg(sb, KERN_INFO, "reservations OFF");
- break;
- case Opt_ignore:
- break;
- default:
- return 0;
+ case Opt_reservation:
+ if (!result.negated) {
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
+ ext2_msg(NULL, KERN_INFO, "reservations ON");
+ } else {
+ ctx_clear_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
+ ext2_msg(NULL, KERN_INFO, "reservations OFF");
}
+ break;
+ case Opt_ignore:
+ break;
+ default:
+ return -EINVAL;
}
- return 1;
+ return 0;
}
static int ext2_setup_super (struct super_block * sb,
@@ -801,24 +790,83 @@ static unsigned long descriptor_loc(struct super_block *sb,
return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
}
-static int ext2_fill_super(struct super_block *sb, void *data, int silent)
+/*
+ * Set all mount options either from defaults on disk, or from parsed
+ * options. Parsed/specified options override on-disk defaults.
+ */
+static void ext2_set_options(struct fs_context *fc, struct ext2_sb_info *sbi)
{
+ struct ext2_fs_context *ctx = fc->fs_private;
+ struct ext2_super_block *es = sbi->s_es;
+ unsigned long def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+
+ /* Copy parsed mount options to sbi */
+ sbi->s_mount_opt = ctx->vals_s_mount_opt;
+
+ /* Use in-superblock defaults only if not specified during parsing */
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_DEBUG) &&
+ def_mount_opts & EXT2_DEFM_DEBUG)
+ set_opt(sbi->s_mount_opt, DEBUG);
+
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_GRPID) &&
+ def_mount_opts & EXT2_DEFM_BSDGROUPS)
+ set_opt(sbi->s_mount_opt, GRPID);
+
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_NO_UID32) &&
+ def_mount_opts & EXT2_DEFM_UID16)
+ set_opt(sbi->s_mount_opt, NO_UID32);
+
+#ifdef CONFIG_EXT2_FS_XATTR
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_XATTR_USER) &&
+ def_mount_opts & EXT2_DEFM_XATTR_USER)
+ set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL) &&
+ def_mount_opts & EXT2_DEFM_ACL)
+ set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
+
+ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK)) {
+ if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
+ set_opt(sbi->s_mount_opt, ERRORS_PANIC);
+ else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
+ set_opt(sbi->s_mount_opt, ERRORS_CONT);
+ else
+ set_opt(sbi->s_mount_opt, ERRORS_RO);
+ }
+
+ if (ctx->spec & EXT2_SPEC_s_resuid)
+ sbi->s_resuid = ctx->s_resuid;
+ else
+ sbi->s_resuid = make_kuid(&init_user_ns,
+ le16_to_cpu(es->s_def_resuid));
+
+ if (ctx->spec & EXT2_SPEC_s_resgid)
+ sbi->s_resgid = ctx->s_resgid;
+ else
+ sbi->s_resgid = make_kgid(&init_user_ns,
+ le16_to_cpu(es->s_def_resgid));
+}
+
+static int ext2_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ struct ext2_fs_context *ctx = fc->fs_private;
+ int silent = fc->sb_flags & SB_SILENT;
struct buffer_head * bh;
struct ext2_sb_info * sbi;
struct ext2_super_block * es;
struct inode *root;
unsigned long block;
- unsigned long sb_block = get_sb_block(&data);
+ unsigned long sb_block = ctx->s_sb_block;
unsigned long logic_sb_block;
unsigned long offset = 0;
- unsigned long def_mount_opts;
long ret = -ENOMEM;
int blocksize = BLOCK_SIZE;
int db_count;
int i, j;
__le32 features;
int err;
- struct ext2_mount_options opts;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
@@ -877,42 +925,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
if (sb->s_magic != EXT2_SUPER_MAGIC)
goto cantfind_ext2;
- opts.s_mount_opt = 0;
- /* Set defaults before we parse the mount options */
- def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
- if (def_mount_opts & EXT2_DEFM_DEBUG)
- set_opt(opts.s_mount_opt, DEBUG);
- if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
- set_opt(opts.s_mount_opt, GRPID);
- if (def_mount_opts & EXT2_DEFM_UID16)
- set_opt(opts.s_mount_opt, NO_UID32);
-#ifdef CONFIG_EXT2_FS_XATTR
- if (def_mount_opts & EXT2_DEFM_XATTR_USER)
- set_opt(opts.s_mount_opt, XATTR_USER);
-#endif
-#ifdef CONFIG_EXT2_FS_POSIX_ACL
- if (def_mount_opts & EXT2_DEFM_ACL)
- set_opt(opts.s_mount_opt, POSIX_ACL);
-#endif
-
- if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
- set_opt(opts.s_mount_opt, ERRORS_PANIC);
- else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
- set_opt(opts.s_mount_opt, ERRORS_CONT);
- else
- set_opt(opts.s_mount_opt, ERRORS_RO);
-
- opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
- opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
-
- set_opt(opts.s_mount_opt, RESERVATION);
-
- if (!parse_options((char *) data, sb, &opts))
- goto failed_mount;
-
- sbi->s_mount_opt = opts.s_mount_opt;
- sbi->s_resuid = opts.s_resuid;
- sbi->s_resgid = opts.s_resgid;
+ ext2_set_options(fc, sbi);
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
@@ -1324,23 +1337,21 @@ static void ext2_write_super(struct super_block *sb)
ext2_sync_fs(sb, 1);
}
-static int ext2_remount (struct super_block * sb, int * flags, char * data)
+static int ext2_reconfigure(struct fs_context *fc)
{
+ struct ext2_fs_context *ctx = fc->fs_private;
+ struct super_block *sb = fc->root->d_sb;
struct ext2_sb_info * sbi = EXT2_SB(sb);
struct ext2_super_block * es;
struct ext2_mount_options new_opts;
+ int flags = fc->sb_flags;
int err;
sync_filesystem(sb);
- spin_lock(&sbi->s_lock);
- new_opts.s_mount_opt = sbi->s_mount_opt;
- new_opts.s_resuid = sbi->s_resuid;
- new_opts.s_resgid = sbi->s_resgid;
- spin_unlock(&sbi->s_lock);
-
- if (!parse_options(data, sb, &new_opts))
- return -EINVAL;
+ new_opts.s_mount_opt = ctx->vals_s_mount_opt;
+ new_opts.s_resuid = ctx->s_resuid;
+ new_opts.s_resgid = ctx->s_resgid;
spin_lock(&sbi->s_lock);
es = sbi->s_es;
@@ -1349,9 +1360,9 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
"dax flag with busy inodes while remounting");
new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
}
- if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
+ if ((bool)(flags & SB_RDONLY) == sb_rdonly(sb))
goto out_set;
- if (*flags & SB_RDONLY) {
+ if (flags & SB_RDONLY) {
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
!(sbi->s_mount_state & EXT2_VALID_FS))
goto out_set;
@@ -1470,10 +1481,9 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
return 0;
}
-static struct dentry *ext2_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int ext2_get_tree(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
+ return get_tree_bdev(fc, ext2_fill_super);
}
#ifdef CONFIG_QUOTA
@@ -1624,12 +1634,49 @@ static int ext2_quota_off(struct super_block *sb, int type)
#endif
+static const struct fs_context_operations ext2_context_ops = {
+ .parse_param = ext2_parse_param,
+ .get_tree = ext2_get_tree,
+ .reconfigure = ext2_reconfigure,
+ .free = ext2_free_fc,
+};
+
+static int ext2_init_fs_context(struct fs_context *fc)
+{
+ struct ext2_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+ struct super_block *sb = fc->root->d_sb;
+ struct ext2_sb_info *sbi = EXT2_SB(sb);
+
+ spin_lock(&sbi->s_lock);
+ ctx->vals_s_mount_opt = sbi->s_mount_opt;
+ ctx->vals_s_flags = sb->s_flags;
+ ctx->s_resuid = sbi->s_resuid;
+ ctx->s_resgid = sbi->s_resgid;
+ spin_unlock(&sbi->s_lock);
+ } else {
+ ctx->s_sb_block = 1;
+ ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
+ }
+
+ fc->fs_private = ctx;
+ fc->ops = &ext2_context_ops;
+
+ return 0;
+}
+
static struct file_system_type ext2_fs_type = {
.owner = THIS_MODULE,
.name = "ext2",
- .mount = ext2_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
+ .init_fs_context = ext2_init_fs_context,
+ .parameters = ext2_param_spec,
};
MODULE_ALIAS_FS("ext2");
--
2.48.0
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