Commit e50b122b authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
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btrfs: print available space for a block group when dumping a space info 



When dumping a space info, we iterate over all its block groups and then
print their size and the amounts of bytes used, reserved, pinned, etc.
When debugging -ENOSPC problems it's also useful to know how much space
is available (free), so calculate that and print it as well.

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b92e8f54

fs/btrfs/space-info.c

+7 −2
Original line number Diff line number Diff line
@@ -523,13 +523,18 @@ void btrfs_dump_space_info(struct btrfs_fs_info *fs_info, 
	down_read(&info->groups_sem);

again:

	list_for_each_entry(cache, &info->block_groups[index], list) {

		u64 avail;



		spin_lock(&cache->lock);

		avail = cache->length - cache->used - cache->pinned -

			cache->reserved - cache->delalloc_bytes -

			cache->bytes_super - cache->zone_unusable;

		btrfs_info(fs_info,

"block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %llu delalloc %llu super %llu zone_unusable %s",

"block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %llu delalloc %llu super %llu zone_unusable (%llu bytes available) %s",

			   cache->start, cache->length, cache->used, cache->pinned,

			   cache->reserved, cache->delalloc_bytes,

			   cache->bytes_super, cache->zone_unusable,

			   cache->ro ? "[readonly]" : "");

			   avail, cache->ro ? "[readonly]" : "");

		spin_unlock(&cache->lock);

		btrfs_dump_free_space(cache, bytes);

	}