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Commit 50a52234 authored by Jan Kara's avatar Jan Kara Committed by Linus Torvalds
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[PATCH] ext2: fix mount options parting 



Restore old set of ext2 mount options when remounting of a filesystem
fails.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 08c6a96f

fs/ext2/ext2.h

+9 −0
Original line number Diff line number Diff line 
#include <linux/fs.h>

#include <linux/ext2_fs.h>



/*

 * ext2 mount options

 */

struct ext2_mount_options {

	unsigned long s_mount_opt;

	uid_t s_resuid;

	gid_t s_resgid;

};



/*

 * second extended file system inode data in memory

 */

fs/ext2/super.c

+21 −3
Original line number Diff line number Diff line
@@ -936,12 +936,23 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) 
	struct ext2_sb_info * sbi = EXT2_SB(sb);

	struct ext2_super_block * es;

	unsigned long old_mount_opt = sbi->s_mount_opt;

	struct ext2_mount_options old_opts;

	unsigned long old_sb_flags;

	int err;



	/* Store the old options */

	old_sb_flags = sb->s_flags;

	old_opts.s_mount_opt = sbi->s_mount_opt;

	old_opts.s_resuid = sbi->s_resuid;

	old_opts.s_resgid = sbi->s_resgid;



	/*

	 * Allow the "check" option to be passed as a remount option.

	 */

	if (!parse_options (data, sbi))

		return -EINVAL;

	if (!parse_options (data, sbi)) {

		err = -EINVAL;

		goto restore_opts;

	}



	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |

		((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
@@ -971,7 +982,8 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) 
			printk("EXT2-fs: %s: couldn't remount RDWR because of "

			       "unsupported optional features (%x).\n",

			       sb->s_id, le32_to_cpu(ret));

			return -EROFS;

			err = -EROFS;

			goto restore_opts;

		}

		/*

		 * Mounting a RDONLY partition read-write, so reread and
@@ -984,6 +996,12 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) 
	}

	ext2_sync_super(sb, es);

	return 0;

restore_opts:

	sbi->s_mount_opt = old_opts.s_mount_opt;

	sbi->s_resuid = old_opts.s_resuid;

	sbi->s_resgid = old_opts.s_resgid;

	sb->s_flags = old_sb_flags;

	return err;

}



static int ext2_statfs (struct super_block * sb, struct kstatfs * buf)