[PATCH v4 06/30] scatterlist: Fix offset in folio calc in extract_xarray_to_sg()

[David Howells]

Fix the calculation of the offset in the folio being extracted in
extract_xarray_to_sg().

Note that in the near future, ITER_XARRAY should be removed.

Fixes: f5f82cd18732 ("Move netfs_extract_iter_to_sg() to lib/scatterlist.c")
Link: https://sashiko.dev/#/patchset/20260608145432.681865-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Paulo Alcantara <pc@xxxxxxxxxxxxx>
cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
cc: Jens Axboe <axboe@xxxxxxxxx>
cc: Mike Marshall <hubcap@xxxxxxxxxxxx>
cc: netfs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
---
 lib/scatterlist.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index b7fe91ef35b8..6ea40d2e6247 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -1366,6 +1366,7 @@ static ssize_t extract_xarray_to_sg(struct iov_iter *iter,
 		sg_max--;
 
 		maxsize -= len;
+		start += len;
 		ret += len;
 		if (maxsize <= 0 || sg_max == 0)
 			break;