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btrfs: print available space across all block groups when dumping space info

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When dumping a space info also sum the available space for all block
groups and then print it. This often useful for debugging -ENOSPC
related problems.

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 16:57:02 +01:00 committed by David Sterba
parent e50b122b83
commit 1ff9fee3bd
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/space-info.c
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@ -510,6 +510,7 @@ void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
int dump_block_groups)
{
struct btrfs_block_group *cache;
u64 total_avail = 0;
int index = 0;
spin_lock(&info->lock);
@ -537,10 +538,13 @@ again:
avail, cache->ro ? "[readonly]" : "");
spin_unlock(&cache->lock);
btrfs_dump_free_space(cache, bytes);
total_avail += avail;
}
if (++index < BTRFS_NR_RAID_TYPES)
goto again;
up_read(&info->groups_sem);
btrfs_info(fs_info, "%llu bytes available across all block groups", total_avail);
}
static inline u64 calc_reclaim_items_nr(const struct btrfs_fs_info *fs_info,