From e50b122b832bed9f36d459f19fd73d00658f5c1e Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@suse.com>
Date: Wed, 26 Jul 2023 16:57:01 +0100
Subject: [PATCH] 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: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/space-info.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index ae12a8a9cd12b..54d78e839c017 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -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);
}
--
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