io_uring: rely solely on FMODE_NOWAIT

Now that we have both sockets and block devices setting FMODE_NOWAIT
appropriately, we can get rid of all the odd special casing in
__io_file_supports_nowait() and rely soley on FMODE_NOWAIT and
O_NONBLOCK rather than special case sockets and (in particular) bdevs.

Link: https://lore.kernel.org/r/20230509151910.183637-4-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 3bca7a79efda4c40c7eb384a84582ec01bc5c3cb..7c426584e35a6ed510c5c690dd30f34ad98b46a7 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1758,11 +1758,6 @@ static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags)
        }
 }
 
-static bool io_bdev_nowait(struct block_device *bdev)
-{
-       return !bdev || bdev_nowait(bdev);
-}
-
 /*
  * If we tracked the file through the SCM inflight mechanism, we could support
  * any file. For now, just ensure that anything potentially problematic is done
@@ -1770,22 +1765,6 @@ static bool io_bdev_nowait(struct block_device *bdev)
  */
 static bool __io_file_supports_nowait(struct file *file, umode_t mode)
 {
-       if (S_ISBLK(mode)) {
-               if (IS_ENABLED(CONFIG_BLOCK) &&
-                   io_bdev_nowait(I_BDEV(file->f_mapping->host)))
-                       return true;
-               return false;
-       }
-       if (S_ISSOCK(mode))
-               return true;
-       if (S_ISREG(mode)) {
-               if (IS_ENABLED(CONFIG_BLOCK) &&
-                   io_bdev_nowait(file->f_inode->i_sb->s_bdev) &&
-                   !io_is_uring_fops(file))
-                       return true;
-               return false;
-       }
-
        /* any ->read/write should understand O_NONBLOCK */
        if (file->f_flags & O_NONBLOCK)
                return true;