[PATCH v2 2/7] iomap: factor out iomap length helper

Brian Foster
2025-01-22T13:32:26Z

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

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
include/linux/iomap.h | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 75bf54e76f3b..b6f7d96156f2 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -230,6 +230,16 @@ struct iomap_iter {

int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops);

+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(len, end - pos);
+}
+
/**
* iomap_length - length of the current iomap iteration
* @iter: iteration structure
@@ -238,11 +248,7 @@ int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops);
*/
static inline u64 iomap_length(const struct iomap_iter *iter)
{
- 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 iomap_length_trim(iter, iter->pos, iter->len);
}

/**
--
2.47.1