ext2: Parse mount options into a dedicated structure
Instead of parsing mount options directly into the superblock (and restoring options in case of error), parse the options into a dedicated structure and only copy everything when we know we can safely switch options. This will allow us to simplify locking and do option parsing without holding sb->s_lock. Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
Родитель
de8cd83e91
Коммит
088519572c
157
fs/ext2/super.c
157
fs/ext2/super.c
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@ -479,10 +479,10 @@ static const match_table_t tokens = {
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{Opt_err, NULL}
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};
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static int parse_options(char *options, struct super_block *sb)
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static int parse_options(char *options, struct super_block *sb,
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struct ext2_mount_options *opts)
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{
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char *p;
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struct ext2_sb_info *sbi = EXT2_SB(sb);
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substring_t args[MAX_OPT_ARGS];
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int option;
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kuid_t uid;
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@ -499,16 +499,16 @@ static int parse_options(char *options, struct super_block *sb)
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_bsd_df:
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clear_opt (sbi->s_mount_opt, MINIX_DF);
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clear_opt (opts->s_mount_opt, MINIX_DF);
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break;
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case Opt_minix_df:
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set_opt (sbi->s_mount_opt, MINIX_DF);
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set_opt (opts->s_mount_opt, MINIX_DF);
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break;
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case Opt_grpid:
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set_opt (sbi->s_mount_opt, GRPID);
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set_opt (opts->s_mount_opt, GRPID);
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break;
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case Opt_nogrpid:
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clear_opt (sbi->s_mount_opt, GRPID);
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clear_opt (opts->s_mount_opt, GRPID);
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break;
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case Opt_resuid:
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if (match_int(&args[0], &option))
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@ -519,7 +519,7 @@ static int parse_options(char *options, struct super_block *sb)
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return 0;
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}
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sbi->s_resuid = uid;
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opts->s_resuid = uid;
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break;
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case Opt_resgid:
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if (match_int(&args[0], &option))
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@ -529,51 +529,51 @@ static int parse_options(char *options, struct super_block *sb)
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ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
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return 0;
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}
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sbi->s_resgid = gid;
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opts->s_resgid = gid;
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break;
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case Opt_sb:
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/* handled by get_sb_block() instead of here */
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/* *sb_block = match_int(&args[0]); */
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break;
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case Opt_err_panic:
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clear_opt (sbi->s_mount_opt, ERRORS_CONT);
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clear_opt (sbi->s_mount_opt, ERRORS_RO);
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set_opt (sbi->s_mount_opt, ERRORS_PANIC);
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clear_opt (opts->s_mount_opt, ERRORS_CONT);
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clear_opt (opts->s_mount_opt, ERRORS_RO);
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set_opt (opts->s_mount_opt, ERRORS_PANIC);
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break;
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case Opt_err_ro:
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clear_opt (sbi->s_mount_opt, ERRORS_CONT);
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clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
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set_opt (sbi->s_mount_opt, ERRORS_RO);
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clear_opt (opts->s_mount_opt, ERRORS_CONT);
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clear_opt (opts->s_mount_opt, ERRORS_PANIC);
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set_opt (opts->s_mount_opt, ERRORS_RO);
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break;
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case Opt_err_cont:
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clear_opt (sbi->s_mount_opt, ERRORS_RO);
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clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
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set_opt (sbi->s_mount_opt, ERRORS_CONT);
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clear_opt (opts->s_mount_opt, ERRORS_RO);
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clear_opt (opts->s_mount_opt, ERRORS_PANIC);
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set_opt (opts->s_mount_opt, ERRORS_CONT);
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break;
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case Opt_nouid32:
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set_opt (sbi->s_mount_opt, NO_UID32);
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set_opt (opts->s_mount_opt, NO_UID32);
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break;
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case Opt_nocheck:
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clear_opt (sbi->s_mount_opt, CHECK);
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clear_opt (opts->s_mount_opt, CHECK);
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break;
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case Opt_debug:
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set_opt (sbi->s_mount_opt, DEBUG);
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set_opt (opts->s_mount_opt, DEBUG);
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break;
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case Opt_oldalloc:
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set_opt (sbi->s_mount_opt, OLDALLOC);
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set_opt (opts->s_mount_opt, OLDALLOC);
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break;
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case Opt_orlov:
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clear_opt (sbi->s_mount_opt, OLDALLOC);
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clear_opt (opts->s_mount_opt, OLDALLOC);
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break;
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case Opt_nobh:
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set_opt (sbi->s_mount_opt, NOBH);
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set_opt (opts->s_mount_opt, NOBH);
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break;
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#ifdef CONFIG_EXT2_FS_XATTR
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case Opt_user_xattr:
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set_opt (sbi->s_mount_opt, XATTR_USER);
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set_opt (opts->s_mount_opt, XATTR_USER);
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break;
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case Opt_nouser_xattr:
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clear_opt (sbi->s_mount_opt, XATTR_USER);
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clear_opt (opts->s_mount_opt, XATTR_USER);
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break;
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#else
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case Opt_user_xattr:
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@ -584,10 +584,10 @@ static int parse_options(char *options, struct super_block *sb)
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#endif
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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case Opt_acl:
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set_opt(sbi->s_mount_opt, POSIX_ACL);
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set_opt(opts->s_mount_opt, POSIX_ACL);
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break;
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case Opt_noacl:
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clear_opt(sbi->s_mount_opt, POSIX_ACL);
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clear_opt(opts->s_mount_opt, POSIX_ACL);
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break;
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#else
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case Opt_acl:
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@ -598,13 +598,13 @@ static int parse_options(char *options, struct super_block *sb)
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#endif
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case Opt_xip:
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ext2_msg(sb, KERN_INFO, "use dax instead of xip");
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set_opt(sbi->s_mount_opt, XIP);
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set_opt(opts->s_mount_opt, XIP);
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/* Fall through */
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case Opt_dax:
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#ifdef CONFIG_FS_DAX
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ext2_msg(sb, KERN_WARNING,
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"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
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set_opt(sbi->s_mount_opt, DAX);
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set_opt(opts->s_mount_opt, DAX);
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#else
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ext2_msg(sb, KERN_INFO, "dax option not supported");
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#endif
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@ -613,11 +613,11 @@ static int parse_options(char *options, struct super_block *sb)
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#if defined(CONFIG_QUOTA)
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case Opt_quota:
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case Opt_usrquota:
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set_opt(sbi->s_mount_opt, USRQUOTA);
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set_opt(opts->s_mount_opt, USRQUOTA);
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break;
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case Opt_grpquota:
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set_opt(sbi->s_mount_opt, GRPQUOTA);
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set_opt(opts->s_mount_opt, GRPQUOTA);
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break;
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#else
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case Opt_quota:
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@ -629,11 +629,11 @@ static int parse_options(char *options, struct super_block *sb)
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#endif
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case Opt_reservation:
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set_opt(sbi->s_mount_opt, RESERVATION);
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set_opt(opts->s_mount_opt, RESERVATION);
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ext2_msg(sb, KERN_INFO, "reservations ON");
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break;
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case Opt_noreservation:
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clear_opt(sbi->s_mount_opt, RESERVATION);
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clear_opt(opts->s_mount_opt, RESERVATION);
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ext2_msg(sb, KERN_INFO, "reservations OFF");
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break;
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case Opt_ignore:
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@ -830,6 +830,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
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int i, j;
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__le32 features;
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int err;
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struct ext2_mount_options opts;
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err = -ENOMEM;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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@ -890,35 +891,39 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
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/* Set defaults before we parse the mount options */
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def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
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if (def_mount_opts & EXT2_DEFM_DEBUG)
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set_opt(sbi->s_mount_opt, DEBUG);
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set_opt(opts.s_mount_opt, DEBUG);
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if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
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set_opt(sbi->s_mount_opt, GRPID);
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set_opt(opts.s_mount_opt, GRPID);
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if (def_mount_opts & EXT2_DEFM_UID16)
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set_opt(sbi->s_mount_opt, NO_UID32);
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set_opt(opts.s_mount_opt, NO_UID32);
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#ifdef CONFIG_EXT2_FS_XATTR
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if (def_mount_opts & EXT2_DEFM_XATTR_USER)
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set_opt(sbi->s_mount_opt, XATTR_USER);
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set_opt(opts.s_mount_opt, XATTR_USER);
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#endif
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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if (def_mount_opts & EXT2_DEFM_ACL)
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set_opt(sbi->s_mount_opt, POSIX_ACL);
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set_opt(opts.s_mount_opt, POSIX_ACL);
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#endif
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if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
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set_opt(sbi->s_mount_opt, ERRORS_PANIC);
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set_opt(opts.s_mount_opt, ERRORS_PANIC);
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else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
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set_opt(sbi->s_mount_opt, ERRORS_CONT);
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set_opt(opts.s_mount_opt, ERRORS_CONT);
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else
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set_opt(sbi->s_mount_opt, ERRORS_RO);
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set_opt(opts.s_mount_opt, ERRORS_RO);
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sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
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sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
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opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
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opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
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set_opt(sbi->s_mount_opt, RESERVATION);
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set_opt(opts.s_mount_opt, RESERVATION);
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if (!parse_options((char *) data, sb))
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if (!parse_options((char *) data, sb, &opts))
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goto failed_mount;
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sbi->s_mount_opt = opts.s_mount_opt;
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sbi->s_resuid = opts.s_resuid;
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sbi->s_resgid = opts.s_resgid;
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sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
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((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
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MS_POSIXACL : 0);
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@ -1312,46 +1317,36 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
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{
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struct ext2_sb_info * sbi = EXT2_SB(sb);
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struct ext2_super_block * es;
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struct ext2_mount_options old_opts;
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unsigned long old_sb_flags;
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struct ext2_mount_options new_opts;
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int err;
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sync_filesystem(sb);
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spin_lock(&sbi->s_lock);
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/* Store the old options */
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old_sb_flags = sb->s_flags;
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old_opts.s_mount_opt = sbi->s_mount_opt;
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old_opts.s_resuid = sbi->s_resuid;
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old_opts.s_resgid = sbi->s_resgid;
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new_opts.s_mount_opt = sbi->s_mount_opt;
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new_opts.s_resuid = sbi->s_resuid;
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new_opts.s_resgid = sbi->s_resgid;
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/*
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* Allow the "check" option to be passed as a remount option.
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*/
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if (!parse_options(data, sb)) {
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err = -EINVAL;
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goto restore_opts;
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if (!parse_options(data, sb, &new_opts)) {
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spin_unlock(&sbi->s_lock);
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return -EINVAL;
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}
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sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
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((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
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es = sbi->s_es;
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if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
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if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
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ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
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"dax flag with busy inodes while remounting");
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sbi->s_mount_opt ^= EXT2_MOUNT_DAX;
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}
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if ((bool)(*flags & MS_RDONLY) == sb_rdonly(sb)) {
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spin_unlock(&sbi->s_lock);
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return 0;
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new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
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}
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if ((bool)(*flags & MS_RDONLY) == sb_rdonly(sb))
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goto out_set;
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if (*flags & MS_RDONLY) {
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if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
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!(sbi->s_mount_state & EXT2_VALID_FS)) {
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spin_unlock(&sbi->s_lock);
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return 0;
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}
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!(sbi->s_mount_state & EXT2_VALID_FS))
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goto out_set;
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/*
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* OK, we are remounting a valid rw partition rdonly, so set
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@ -1362,22 +1357,20 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
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spin_unlock(&sbi->s_lock);
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err = dquot_suspend(sb, -1);
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if (err < 0) {
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spin_lock(&sbi->s_lock);
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goto restore_opts;
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}
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if (err < 0)
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return err;
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ext2_sync_super(sb, es, 1);
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} else {
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__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
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~EXT2_FEATURE_RO_COMPAT_SUPP);
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if (ret) {
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spin_unlock(&sbi->s_lock);
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ext2_msg(sb, KERN_WARNING,
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"warning: couldn't remount RDWR because of "
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"unsupported optional features (%x).",
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le32_to_cpu(ret));
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err = -EROFS;
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goto restore_opts;
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return -EROFS;
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}
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/*
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* Mounting a RDONLY partition read-write, so reread and
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@ -1394,14 +1387,16 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
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dquot_resume(sb, -1);
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}
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return 0;
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restore_opts:
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sbi->s_mount_opt = old_opts.s_mount_opt;
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sbi->s_resuid = old_opts.s_resuid;
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sbi->s_resgid = old_opts.s_resgid;
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sb->s_flags = old_sb_flags;
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spin_lock(&sbi->s_lock);
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out_set:
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sbi->s_mount_opt = new_opts.s_mount_opt;
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sbi->s_resuid = new_opts.s_resuid;
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sbi->s_resgid = new_opts.s_resgid;
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sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
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((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
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spin_unlock(&sbi->s_lock);
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return err;
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return 0;
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}
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static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
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