From: Sheng Yong <[email protected]>
For file-backed mount, IO requests are handled by vfs_iocb_iter_read().
However, it can be interrupted by SIGKILL, returning the number of
bytes actually copied. Unused folios in bio are unexpectedly marked
as uptodate.
vfs_read
filemap_read
filemap_get_pages
filemap_readahead
erofs_fileio_readahead
erofs_fileio_rq_submit
vfs_iocb_iter_read
filemap_read
filemap_get_pages <= detect signal
erofs_fileio_ki_complete <= set all folios uptodate
This patch addresses this by setting short read bio with an error
directly.
Fixes: bc804a8d7e86 ("erofs: handle end of filesystem properly for file-backed
mounts")
Reported-by: chenguanyou <[email protected]>
Signed-off-by: Yunlei He <[email protected]>
Signed-off-by: Sheng Yong <[email protected]>
---
fs/erofs/fileio.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/erofs/fileio.c b/fs/erofs/fileio.c
index abe873f01297..98cdaa1cd1a7 100644
--- a/fs/erofs/fileio.c
+++ b/fs/erofs/fileio.c
@@ -25,10 +25,8 @@ 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 && ret != rq->bio.bi_iter.bi_size) {
- bio_advance(&rq->bio, ret);
- zero_fill_bio(&rq->bio);
- }
+ if (ret >= 0 && ret != rq->bio.bi_iter.bi_size)
+ ret = -EIO;
if (!rq->bio.bi_end_io) {
bio_for_each_folio_all(fi, &rq->bio) {
DBG_BUGON(folio_test_uptodate(fi.folio));
--
2.43.0
