From: Zhao Lei Date: Thu, 31 Dec 2015 13:07:17 +0000 (+0800) Subject: btrfs: reada: move reada_extent_put to place after __readahead_hook() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b257cf50060cada63a3fe11a932909b9badf4595;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git btrfs: reada: move reada_extent_put to place after __readahead_hook() We can't release reada_extent earlier than __readahead_hook(), because __readahead_hook() still need to use it, it is necessary to hode a refcnt to avoid it be freed. Actually it is not a problem after my patch named: Avoid many times of empty loop It make reada_extent in above line include at least one reada_extctl, which keeps additional one refcnt for reada_extent. But we still need this patch to make the code in pretty logic. Signed-off-by: Zhao Lei Signed-off-by: David Sterba --- diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index b40dbf717737..f7642e569bd9 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -717,8 +717,6 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info, } logical = re->logical; - reada_extent_put(fs_info, re); - atomic_inc(&dev->reada_in_flight); ret = reada_tree_block_flagged(fs_info->extent_root, logical, mirror_num, &eb); @@ -730,6 +728,8 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info, if (eb) free_extent_buffer(eb); + reada_extent_put(fs_info, re); + return 1; }