From d7f81fac97e6d06c4e9bf090085137aa2dddff99 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Tue, 21 Jul 2020 10:22:14 -0400 Subject: btrfs: handle U64_MAX for shrink_delalloc Data allocations are going to want to pass in U64_MAX for flushing space, adjust shrink_delalloc to handle this properly. Reviewed-by: Nikolay Borisov Reviewed-by: Johannes Thumshirn Tested-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/space-info.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'fs/btrfs/space-info.c') diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index 9c79bdfd145b..2b48b37216eb 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -530,8 +530,19 @@ static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim, int loops; /* Calc the number of the pages we need flush for space reservation */ - items = calc_reclaim_items_nr(fs_info, to_reclaim); - to_reclaim = items * EXTENT_SIZE_PER_ITEM; + if (to_reclaim == U64_MAX) { + items = U64_MAX; + } else { + /* + * to_reclaim is set to however much metadata we need to + * reclaim, but reclaiming that much data doesn't really track + * exactly, so increase the amount to reclaim by 2x in order to + * make sure we're flushing enough delalloc to hopefully reclaim + * some metadata reservations. + */ + items = calc_reclaim_items_nr(fs_info, to_reclaim) * 2; + to_reclaim = items * EXTENT_SIZE_PER_ITEM; + } trans = (struct btrfs_trans_handle *)current->journal_info; space_info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); @@ -742,7 +753,7 @@ static void flush_space(struct btrfs_fs_info *fs_info, break; case FLUSH_DELALLOC: case FLUSH_DELALLOC_WAIT: - shrink_delalloc(fs_info, num_bytes * 2, + shrink_delalloc(fs_info, num_bytes, state == FLUSH_DELALLOC_WAIT); break; case FLUSH_DELAYED_REFS_NR: -- cgit v1.2.3