Unverified Commit abb0ea19 authored by Brian Foster's avatar Brian Foster Committed by Christian Brauner
Browse files

iomap: factor out iomap length helper 



In preparation to support more granular iomap iter advancing, factor
the pos/len values as parameters to length calculation.

Signed-off-by: default avatarBrian Foster <bfoster@redhat.com>
Link: https://lore.kernel.org/r/20250207143253.314068-2-bfoster@redhat.com


Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatar"Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent f8789733

include/linux/iomap.h

+19 −4
Original line number Diff line number Diff line
@@ -238,18 +238,33 @@ struct iomap_iter { 
int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops);



/**

 * iomap_length - length of the current iomap iteration

 * iomap_length_trim - trimmed length of the current iomap iteration

 * @iter: iteration structure

 * @pos: File position to trim from.

 * @len: Length of the mapping to trim to.

 *

 * Returns the length that the operation applies to for the current iteration.

 * Returns a trimmed length that the operation applies to for the current

 * iteration.

 */

static inline u64 iomap_length(const struct iomap_iter *iter)

static inline u64 iomap_length_trim(const struct iomap_iter *iter, loff_t pos,

		u64 len)

{

	u64 end = iter->iomap.offset + iter->iomap.length;



	if (iter->srcmap.type != IOMAP_HOLE)

		end = min(end, iter->srcmap.offset + iter->srcmap.length);

	return min(iter->len, end - iter->pos);

	return min(len, end - pos);

}



/**

 * iomap_length - length of the current iomap iteration

 * @iter: iteration structure

 *

 * Returns the length that the operation applies to for the current iteration.

 */

static inline u64 iomap_length(const struct iomap_iter *iter)

{

	return iomap_length_trim(iter, iter->pos, iter->len);

}



/**