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btrfs: print available space for a block group when dumping a space info

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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>
This commit is contained in:
Filipe Manana 2023-07-26 16:57:01 +01:00 committed by David Sterba
parent b92e8f5472
commit e50b122b83
1 changed files with 7 additions and 2 deletions
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9
fs/btrfs/space-info.c
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@ -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);
}