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btrfs: reset max_extent_size properly 

If we use up our block group before allocating a new one we'll easily
get a max_extent_size that's set really really low, which will result in
a lot of fragmentation.  We need to make sure we're resetting the
max_extent_size when we add a new chunk or add new space.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2018-10-11 15:54:03 -04:00 committed by David Sterba
parent b2b5b6502c
commit 21a94f7acf
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/extent-tree.c
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@ -4565,6 +4565,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
goto out;
} else {
ret = 1;
space_info->max_extent_size = 0;
}
space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
@ -6459,6 +6460,7 @@ static void btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache,
space_info->bytes_readonly += num_bytes;
cache->reserved -= num_bytes;
space_info->bytes_reserved -= num_bytes;
space_info->max_extent_size = 0;
if (delalloc)
cache->delalloc_bytes -= num_bytes;