fs, block: copy_file_range for def_blk_ops for direct block device

For direct block device opened with O_DIRECT, use blkdev_copy_offload to issue device copy offload, or use splice_copy_file_range in case device copy offload capability is absent or the device files are not open with O_DIRECT. Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Anuj Gupta <[email protected]> Signed-off-by: Nitesh Shetty <[email protected]>
truenas · Jul 5, 2024 · cb78d2e · cb78d2e
1 parent 1c6ab05
commit cb78d2e
Showing 1 changed file with 23 additions and 0 deletions.
diff --git a/block/fops.c b/block/fops.c
@@ -735,6 +735,28 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
  return ret;
 }
 
+static ssize_t blkdev_copy_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t len, unsigned int flags)
+{
+ struct block_device *in_bdev = I_BDEV(bdev_file_inode(file_in));
+ struct block_device *out_bdev = I_BDEV(bdev_file_inode(file_out));
+ ssize_t copied = 0;
+
+ if ((in_bdev == out_bdev) && bdev_max_copy_sectors(in_bdev) &&
+ (file_in->f_iocb_flags & IOCB_DIRECT) &&
+ (file_out->f_iocb_flags & IOCB_DIRECT)) {
+ copied = blkdev_copy_offload(in_bdev, pos_in, pos_out, len,
+ NULL, NULL, GFP_KERNEL);
+ if (copied < 0)
+ copied = 0;
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ return copied;
+}
+
 #define BLKDEV_FALLOC_FL_SUPPORTED \
  (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
  FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
@@ -839,6 +861,7 @@ const struct file_operations def_blk_fops = {
  .splice_read = filemap_splice_read,
  .splice_write = iter_file_splice_write,
  .fallocate = blkdev_fallocate,
+ .copy_file_range = blkdev_copy_file_range,
 };
 
 static __init int blkdev_init(void)