btrfs: print the block rsv type when we fail our reservation

To help with debugging, print the type of the block rsv when we fail to
use our target block rsv in btrfs_use_block_rsv.

This now produces:

 [  544.672035] BTRFS: block rsv 1 returned -28

which is still cryptic without consulting the enum in block-rsv.h but I
guess it's better than nothing.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add note from Nikolay ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/block-rsv.c b/fs/btrfs/block-rsv.c
index 7e1549a84fcc99d4d8c7e8b45691c71ebd254867..bc920afe23bf09681cacf51b4db0f10648c3f974 100644 (file)
--- a/fs/btrfs/block-rsv.c
+++ b/fs/btrfs/block-rsv.c
@@ -511,7 +511,8 @@ again:
                                /*DEFAULT_RATELIMIT_BURST*/ 1);
                if (__ratelimit(&_rs))
                        WARN(1, KERN_DEBUG
-                               "BTRFS: block rsv returned %d\n", ret);
+                               "BTRFS: block rsv %d returned %d\n",
+                               block_rsv->type, ret);
        }
 try_reserve:
        ret = btrfs_reserve_metadata_bytes(root, block_rsv, blocksize,