From aebb224fd4fc7352cd839ad90414c548387142fd Mon Sep 17 00:00:00 2001 From: Dylan Yudaken Date: Fri, 27 Jan 2023 05:52:25 -0800 Subject: io_uring: for requests that require async, force it Some requests require being run async as they do not support non-blocking. Instead of trying to issue these requests, getting -EAGAIN and then queueing them for async issue, rather just force async upfront. Add WARN_ON_ONCE to make sure surprising code paths do not come up, however in those cases the bug would end up being a blocking io_uring_enter(2) which should not be critical. Signed-off-by: Dylan Yudaken Link: https://lore.kernel.org/r/20230127135227.3646353-3-dylany@meta.com Signed-off-by: Jens Axboe --- io_uring/xattr.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) (limited to 'io_uring/xattr.c') diff --git a/io_uring/xattr.c b/io_uring/xattr.c index 6201a9f442c6..e1c810e0b85a 100644 --- a/io_uring/xattr.c +++ b/io_uring/xattr.c @@ -75,6 +75,7 @@ static int __io_getxattr_prep(struct io_kiocb *req, } req->flags |= REQ_F_NEED_CLEANUP; + req->flags |= REQ_F_FORCE_ASYNC; return 0; } @@ -109,8 +110,7 @@ int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags) struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr); int ret; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); ret = do_getxattr(mnt_idmap(req->file->f_path.mnt), req->file->f_path.dentry, @@ -127,8 +127,7 @@ int io_getxattr(struct io_kiocb *req, unsigned int issue_flags) struct path path; int ret; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); retry: ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); @@ -174,6 +173,7 @@ static int __io_setxattr_prep(struct io_kiocb *req, } req->flags |= REQ_F_NEED_CLEANUP; + req->flags |= REQ_F_FORCE_ASYNC; return 0; } @@ -222,8 +222,7 @@ int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags) { int ret; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); ret = __io_setxattr(req, issue_flags, &req->file->f_path); io_xattr_finish(req, ret); @@ -237,8 +236,7 @@ int io_setxattr(struct io_kiocb *req, unsigned int issue_flags) struct path path; int ret; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); retry: ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); -- cgit v1.2.3