[PATCH 6.19 026/781] erofs: handle end of filesystem properly for file-backed mounts

Greg Kroah-Hartman
2026-02-25T01:28:05Z

From: Gao Xiang <hsiangkao@linux.alibaba.com>

[ Upstream commit bc804a8d7e865ef47fb7edcaf5e77d18bf444ebc ]

I/O requests beyond the end of the filesystem should be zeroed out,
similar to loopback devices and that is what we expect.

Fixes: ce63cb62d794 ("erofs: support unencoded inodes for fileio")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/erofs/fileio.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/fs/erofs/fileio.c b/fs/erofs/fileio.c
index 1673c5416fba1..2a778a02681a0 100644
--- a/fs/erofs/fileio.c
+++ b/fs/erofs/fileio.c
@@ -25,21 +25,17 @@ static void erofs_fileio_ki_complete(struct kiocb *iocb, long ret)
container_of(iocb, struct erofs_fileio_rq, iocb);
struct folio_iter fi;

- if (ret > 0) {
- if (ret != rq->bio.bi_iter.bi_size) {
- bio_advance(&rq->bio, ret);
- zero_fill_bio(&rq->bio);
- }
- ret = 0;
+ if (ret >= 0 && ret != rq->bio.bi_iter.bi_size) {
+ bio_advance(&rq->bio, ret);
+ zero_fill_bio(&rq->bio);
}
- if (rq->bio.bi_end_io) {
- if (ret < 0 && !rq->bio.bi_status)
- rq->bio.bi_status = errno_to_blk_status(ret);
- } else {
+ if (!rq->bio.bi_end_io) {
bio_for_each_folio_all(fi, &rq->bio) {
DBG_BUGON(folio_test_uptodate(fi.folio));
- erofs_onlinefolio_end(fi.folio, ret, false);
+ erofs_onlinefolio_end(fi.folio, ret < 0, false);
}
+ } else if (ret < 0 && !rq->bio.bi_status) {
+ rq->bio.bi_status = errno_to_blk_status(ret);
}
bio_endio(&rq->bio);
bio_uninit(&rq->bio);
@@ -50,7 +46,7 @@ static void erofs_fileio_ki_complete(struct kiocb *iocb, long ret)
static void erofs_fileio_rq_submit(struct erofs_fileio_rq *rq)
{
struct iov_iter iter;
- int ret;
+ ssize_t ret;

if (!rq)
return;
--
2.51.0