From d3ee29e39653455b7d799f77872d7df8c4060613 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Mon, 4 Nov 2013 23:13:20 +0800 Subject: [PATCH] Btrfs: remove unnecessary initialization and memory barrior in shrink_delalloc() Signed-off-by: Miao Xie Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index fb5c76795eda..5e0e6bcf67b9 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4034,15 +4034,14 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, u64 delalloc_bytes; u64 max_reclaim; long time_left; - unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; - int loops = 0; + unsigned long nr_pages; + int loops; enum btrfs_reserve_flush_enum flush; trans = (struct btrfs_trans_handle *)current->journal_info; block_rsv = &root->fs_info->delalloc_block_rsv; space_info = block_rsv->space_info; - smp_mb(); delalloc_bytes = percpu_counter_sum_positive( &root->fs_info->delalloc_bytes); if (delalloc_bytes == 0) { @@ -4052,6 +4051,7 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, return; } + loops = 0; while (delalloc_bytes && loops < 3) { max_reclaim = min(delalloc_bytes, to_reclaim); nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; @@ -4082,7 +4082,6 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, if (time_left) break; } - smp_mb(); delalloc_bytes = percpu_counter_sum_positive( &root->fs_info->delalloc_bytes); } -- 2.39.2