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[PATCH] ext4: refuse ro to rw remount of fs with orphan inodes

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In the rare case where we have skipped orphan inode processing due to a
readonly block device, and the block device subsequently changes back to
read-write, disallow a remount,rw transition of the filesystem when we have an
unprocessed orphan inodes as this would corrupt the list.

Ideally we should process the orphan inode list during the remount, but that's
trickier, and this plugs the hole for now.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Sandeen 2007-02-10 01:46:08 -08:00 committed by Linus Torvalds
parent ea9a05a133
commit ead6596b9e
1 changed files with 16 additions and 0 deletions
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16
fs/ext4/super.c
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@ -2419,6 +2419,22 @@ static int ext4_remount (struct super_block * sb, int * flags, char * data)
err = -EROFS;
goto restore_opts;
}
/*
* If we have an unprocessed orphan list hanging
* around from a previously readonly bdev mount,
* require a full umount/remount for now.
*/
if (es->s_last_orphan) {
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
"remount RDWR because of unprocessed "
"orphan inode list. Please "
"umount/remount instead.\n",
sb->s_id);
err = -EINVAL;
goto restore_opts;
}
/*
* Mounting a RDONLY partition read-write, so reread
* and store the current valid flag. (It may have