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authorMiao Xie <miaox@cn.fujitsu.com>2013-12-26 09:07:03 +0400
committerChris Mason <clm@fb.com>2014-01-29 01:20:07 +0400
commit0353808cae35bc81c86e3510748a10f6bdff41b8 (patch)
tree1dc627f499542fad31043724671d941469ceb0c3 /fs/btrfs/delayed-inode.c
parent4dd466d36a50d9c96cd990e2e0d472fe720a10aa (diff)
downloadlinux-0353808cae35bc81c86e3510748a10f6bdff41b8.tar.xz
Btrfs: cleanup code of btrfs_balance_delayed_items()
- move the condition check for wait into a function - use wait_event_interruptible instead of prepare-schedule-finish process Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/delayed-inode.c')
-rw-r--r--fs/btrfs/delayed-inode.c34
1 files changed, 11 insertions, 23 deletions
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 10d149c1fde1..6b2013403f46 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1349,52 +1349,40 @@ void btrfs_assert_delayed_root_empty(struct btrfs_root *root)
WARN_ON(btrfs_first_delayed_node(delayed_root));
}
-static int refs_newer(struct btrfs_delayed_root *delayed_root,
- int seq, int count)
+static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq)
{
int val = atomic_read(&delayed_root->items_seq);
- if (val < seq || val >= seq + count)
+ if (val < seq || val >= seq + BTRFS_DELAYED_BATCH)
return 1;
+
+ if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
+ return 1;
+
return 0;
}
void btrfs_balance_delayed_items(struct btrfs_root *root)
{
struct btrfs_delayed_root *delayed_root;
- int seq;
delayed_root = btrfs_get_delayed_root(root);
if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
return;
- seq = atomic_read(&delayed_root->items_seq);
-
if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
+ int seq;
int ret;
- DEFINE_WAIT(__wait);
+
+ seq = atomic_read(&delayed_root->items_seq);
ret = btrfs_wq_run_delayed_node(delayed_root, root, 0);
if (ret)
return;
- while (1) {
- prepare_to_wait(&delayed_root->wait, &__wait,
- TASK_INTERRUPTIBLE);
-
- if (refs_newer(delayed_root, seq,
- BTRFS_DELAYED_BATCH) ||
- atomic_read(&delayed_root->items) <
- BTRFS_DELAYED_BACKGROUND) {
- break;
- }
- if (!signal_pending(current))
- schedule();
- else
- break;
- }
- finish_wait(&delayed_root->wait, &__wait);
+ wait_event_interruptible(delayed_root->wait,
+ could_end_wait(delayed_root, seq));
return;
}