Do the early unlocked syncing even earlier to move more code out of
the recursive path.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
fs/block_dev.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 2b5073e3c923..41d2d9708bf8 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1552,16 +1552,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
struct gendisk *disk = bdev->bd_disk;
struct block_device *victim = NULL;
- /*
- * Sync early if it looks like we're the last one. If someone else
- * opens the block device between now and the decrement of bd_openers
- * then we did a sync that we didn't need to, but that's not the end
- * of the world and we want to avoid long (could be several minute)
- * syncs while holding the mutex.
- */
- if (bdev->bd_openers == 1)
- sync_blockdev(bdev);
-
mutex_lock_nested(&bdev->bd_mutex, for_part);
if (for_part)
bdev->bd_part_count--;
@@ -1588,6 +1578,16 @@ void blkdev_put(struct block_device *bdev, fmode_t mode)
{
struct gendisk *disk = bdev->bd_disk;
+ /*
+ * Sync early if it looks like we're the last one. If someone else
+ * opens the block device between now and the decrement of bd_openers
+ * then we did a sync that we didn't need to, but that's not the end
+ * of the world and we want to avoid long (could be several minute)
+ * syncs while holding the mutex.
+ */
+ if (bdev->bd_openers == 1)
+ sync_blockdev(bdev);
+
mutex_lock(&bdev->bd_mutex);
if (mode & FMODE_EXCL) {
--
2.30.2
