On 5/22/25 00:31, Keith Busch wrote:
From: Keith Busch <kbusch@xxxxxxxxxx>
Provide a basic block level api to copy a range of a block device's
sectors to a new destination on the same device. This just reads the
source data into host memory, then writes it back out to the device at
the requested destination.
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
block/blk-lib.c | 62 +++++++++++++++++++++++++++++++++++++++++
block/ioctl.c | 30 ++++++++++++++++++++
include/linux/blkdev.h | 2 ++
include/uapi/linux/fs.h | 3 ++
4 files changed, 97 insertions(+)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 4c9f20a689f7b..a819ded0ed3a9 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -368,3 +368,65 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
return ret;
}
EXPORT_SYMBOL(blkdev_issue_secure_erase);
+
+/**
+ * blkdev_copy - copy source sectors to a destination on the same block device
+ * @dst_sector: start sector of the destination to copy to
+ * @src_sector: start sector of the source to copy from
+ * @nr_sects: number of sectors to copy
+ * @gfp: allocation flags to use
+ */
+int blkdev_copy(struct block_device *bdev, sector_t dst_sector,
+ sector_t src_sector, sector_t nr_sects, gfp_t gfp)
+{
Hmm. This interface is for copies _within_ the same bdev only.
Shouldn't we rather expand it to have _two_ bdev arguments to
eventually handle copies between bdevs?
In the end the function itself wouldn't change...
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
