ext3: Replace lock/unlock_super() with an explicit lock for resizing

Use a separate lock to protect s_groups_count and the other block
group descriptors which get changed via an on-line resize operation,
so we can stop overloading the use of lock_super().

Port of ext4 commit 32ed5058ce90024efcd811254b4b1de0468099df by
Theodore Ts'o <tytso@mit.edu>.

CC: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 97dd3828384c..afa2b569da10 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1929,6 +1929,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 #endif
         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
         mutex_init(&sbi->s_orphan_lock);
+        mutex_init(&sbi->s_resize_lock);
 
         sb->s_root = NULL;