sync_blockdev_range() is to support syncing multiple sectors
with as few block device requests as possible, it is helpful
to make the block device to give full play to its performance.
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@xxxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Reviewed-by: Andy Wu <Andy.Wu@xxxxxxxx>
Reviewed-by: Aoyama Wataru <wataru.aoyama@xxxxxxxx>
cc: Jens Axboe <axboe@xxxxxxxxx>
---
block/bdev.c | 10 ++++++++++
include/linux/blkdev.h | 6 ++++++
2 files changed, 16 insertions(+)
diff --git a/block/bdev.c b/block/bdev.c
index 102837a37051..57043e4f3322 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -200,6 +200,16 @@ int sync_blockdev(struct block_device *bdev)
}
EXPORT_SYMBOL(sync_blockdev);
+int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend)
+{
+ if (!bdev)
+ return 0;
+
+ return filemap_write_and_wait_range(bdev->bd_inode->i_mapping,
+ lstart, lend);
+}
+EXPORT_SYMBOL(sync_blockdev_range);
+
/*
* Write out and wait upon all dirty data associated with this
* device. Filesystem data as well as the underlying block
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 16b47035e4b0..1e85d0688d9c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1310,6 +1310,7 @@ int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
#ifdef CONFIG_BLOCK
void invalidate_bdev(struct block_device *bdev);
int sync_blockdev(struct block_device *bdev);
+int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
int sync_blockdev_nowait(struct block_device *bdev);
void sync_bdevs(bool wait);
#else
@@ -1320,6 +1321,11 @@ static inline int sync_blockdev(struct block_device *bdev)
{
return 0;
}
+static inline int sync_blockdev_range(struct block_device *bdev, loff_t lstart,
+ loff_t lend)
+{
+ return 0;
+}
static inline int sync_blockdev_nowait(struct block_device *bdev)
{
return 0;
--
2.25.1
Attachment:
v2-0001-block-add-sync_blockdev_range.patch
Description: v2-0001-block-add-sync_blockdev_range.patch
