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authorAl Viro <viro@zeniv.linux.org.uk>2022-05-22 14:59:25 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2022-08-08 22:37:15 -0400
commitfcb14cb1bdacec5b4374fe161e83fb8208164a85 (patch)
tree06b308b8f6b67c65e0c1e90d2e97e61ae66f232a /mm
parentfa9db655d0e112c108fe838809608caf759bdf5e (diff)
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new iov_iter flavour - ITER_UBUF
Equivalent of single-segment iovec. Initialized by iov_iter_ubuf(), checked for by iter_is_ubuf(), otherwise behaves like ITER_IOVEC ones. We are going to expose the things like ->write_iter() et.al. to those in subsequent commits. New predicate (user_backed_iter()) that is true for ITER_IOVEC and ITER_UBUF; places like direct-IO handling should use that for checking that pages we modify after getting them from iov_iter_get_pages() would need to be dirtied. DO NOT assume that replacing iter_is_iovec() with user_backed_iter() will solve all problems - there's code that uses iter_is_iovec() to decide how to poke around in iov_iter guts and for that the predicate replacement obviously won't suffice. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm')
-rw-r--r--mm/shmem.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index e5e43b990fdc..e3a7e171bbd1 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2602,7 +2602,7 @@ static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
ret = copy_page_to_iter(page, offset, nr, to);
put_page(page);
- } else if (iter_is_iovec(to)) {
+ } else if (user_backed_iter(to)) {
/*
* Copy to user tends to be so well optimized, but
* clear_user() not so much, that it is noticeably