diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2022-05-22 14:59:25 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2022-08-08 22:37:15 -0400 |
| commit | fcb14cb1bdacec5b4374fe161e83fb8208164a85 (patch) | |
| tree | 06b308b8f6b67c65e0c1e90d2e97e61ae66f232a /mm | |
| parent | fa9db655d0e112c108fe838809608caf759bdf5e (diff) | |
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.c | 2 |
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 |