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[07/15] Btrfs: Cleanup btrfs_bio_counter_inc_blocked()

Message ID 1421737905-1693-8-git-send-email-zhaolei@cn.fujitsu.com (mailing list archive)
State Accepted
Headers show

Commit Message

Zhaolei Jan. 20, 2015, 7:11 a.m. UTC 
From: Zhao Lei <zhaolei@cn.fujitsu.com>

1: Remove no-need DEFINE_WAIT(wait)
2: Add likely() for BTRFS_FS_STATE_DEV_REPLACING condition
3: Use while loop instead of goto

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---
 fs/btrfs/dev-replace.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
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Patch

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index ca6a3a3..92109b7 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -932,15 +932,15 @@  void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount)
 
 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info)
 {
-	DEFINE_WAIT(wait);
-again:
-	percpu_counter_inc(&fs_info->bio_counter);
-	if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) {
+	while (1) {
+		percpu_counter_inc(&fs_info->bio_counter);
+		if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING,
+				     &fs_info->fs_state)))
+			break;
+
 		btrfs_bio_counter_dec(fs_info);
 		wait_event(fs_info->replace_wait,
 			   !test_bit(BTRFS_FS_STATE_DEV_REPLACING,
 				     &fs_info->fs_state));
-		goto again;
 	}
-
 }