From f2ab76188ec185dde84e7fe7c533ef2f5d668a32 Mon Sep 17 00:00:00 2001 From: Zhao Lei Date: Mon, 16 Feb 2015 18:52:17 +0800 Subject: [PATCH] btrfs: Fix tail space processing in find_free_dev_extent() It is another reason for NO_SPACE case. When we found enough free space in loop and saved them to max_hole_start/size before, and tail space contains pending extent, origional innocent max_hole_start/size are reset in retry. As a result, find_free_dev_extent() returns less space than it can, and cause NO_SPACE in user program. Reviewed-by: Liu Bo Signed-off-by: Zhao Lei Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index a73acf496e10..8bcd2a007517 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1134,11 +1134,11 @@ int find_free_dev_extent(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); if (!path) return -ENOMEM; -again: + max_hole_start = search_start; max_hole_size = 0; - hole_size = 0; +again: if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { ret = -ENOSPC; goto out; @@ -1231,21 +1231,23 @@ int find_free_dev_extent(struct btrfs_trans_handle *trans, * allocated dev extents, and when shrinking the device, * search_end may be smaller than search_start. */ - if (search_end > search_start) + if (search_end > search_start) { hole_size = search_end - search_start; - if (hole_size > max_hole_size) { - max_hole_start = search_start; - max_hole_size = hole_size; - } + if (contains_pending_extent(trans, device, &search_start, + hole_size)) { + btrfs_release_path(path); + goto again; + } - if (contains_pending_extent(trans, device, &search_start, hole_size)) { - btrfs_release_path(path); - goto again; + if (hole_size > max_hole_size) { + max_hole_start = search_start; + max_hole_size = hole_size; + } } /* See above. */ - if (hole_size < num_bytes) + if (max_hole_size < num_bytes) ret = -ENOSPC; else ret = 0;