ext4: 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().
    
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7f43fde9554..1fbf0906ae2 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2646,6 +2646,7 @@ static int ext4_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;