btrfs: remove check for NULL block reserve at btrfs_block_rsv_check()

The block reserve passed to btrfs_block_rsv_check() is never NULL, so
remove the check. In case it can ever become NULL in the future, then
we'll get a pretty obvious and clear NULL pointer dereference crash and
stack trace.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/block-rsv.c b/fs/btrfs/block-rsv.c
index 5367a14..364a3d1 100644 (file)
--- a/fs/btrfs/block-rsv.c
+++ b/fs/btrfs/block-rsv.c
@@ -232,9 +232,6 @@ int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_percent)
        u64 num_bytes = 0;
        int ret = -ENOSPC;
 
-       if (!block_rsv)
-               return 0;
-
        spin_lock(&block_rsv->lock);
        num_bytes = mult_perc(block_rsv->size, min_percent);
        if (block_rsv->reserved >= num_bytes)