io_uring: IORING_OP_WRITE needs hash_reg_file set

commit 7b3188e7ed54102a5dcc73d07727f41fb528f7c8 upstream.

During some testing, it became evident that using IORING_OP_WRITE doesn't
hash buffered writes like the other writes commands do. That's simply
an oversight, and can cause performance regressions when doing buffered
writes with this command.

Correct that and add the flag, so that buffered writes are correctly
hashed when using the non-iovec based write command.

Cc: stable@vger.kernel.org
Fixes: 3a6820f2bb8a ("io_uring: add non-vectored read/write commands")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0d6f1b335fb376274b480d550d302bd69cea04b6..d760fb167d8fe565e8d1711d7badb57e04151ad6 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1001,6 +1001,7 @@ static const struct io_op_def io_op_defs[] = {
        },
        [IORING_OP_WRITE] = {
                .needs_file             = 1,
+               .hash_reg_file          = 1,
                .unbound_nonreg_file    = 1,
                .pollout                = 1,
                .plug                   = 1,