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authorMiao Xie <miaox@cn.fujitsu.com>2013-11-04 23:13:20 +0800
committerChris Mason <chris.mason@fusionio.com>2013-11-11 22:13:07 -0500
commitd3ee29e39653455b7d799f77872d7df8c4060613 (patch)
tree57621b00855465df0cedfda92b45d9aee323cdfc /fs/btrfs
parent3b7a016f44d51ba8425c244f4c607f93fa213fd2 (diff)
Btrfs: remove unnecessary initialization and memory barrior in shrink_delalloc()
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/extent-tree.c7
1 files 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);
}