From: Goldwyn Rodrigues Subject: [PATCH 03/10] fs: Use RWF_* flags for AIO operations Date: Mon, 5 Jun 2017 00:35:33 -0500 Message-ID: <20170605053540.19393-4-rgoldwyn@suse.de> References: <20170605053540.19393-1-rgoldwyn@suse.de> Cc: jack@suse.com, hch@infradead.org, linux-block@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, axboe@kernel.dk, linux-api@vger.kernel.org, adam.manzanares@wdc.com, viro@zeniv.linux.org.uk, Goldwyn Rodrigues To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <20170605053540.19393-1-rgoldwyn@suse.de> Sender: linux-btrfs-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Goldwyn Rodrigues aio_rw_flags is introduced in struct iocb (using aio_reserved1) which will carry the RWF_* flags. We cannot use aio_flags because they are not checked for validity which may break existing applications. Note, the only place RWF_HIPRI comes in effect is dio_await_one(). All the rest of the locations, aio code return -EIOCBQUEUED before the checks for RWF_HIPRI. Reviewed-by: Christoph Hellwig Reviewed-by: Jan Kara Signed-off-by: Goldwyn Rodrigues --- fs/aio.c | 8 +++++++- include/uapi/linux/aio_abi.h | 2 +- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index f52d925ee259..020fa0045e3c 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -1541,7 +1541,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, ssize_t ret; /* enforce forwards compatibility on users */ - if (unlikely(iocb->aio_reserved1 || iocb->aio_reserved2)) { + if (unlikely(iocb->aio_reserved2)) { pr_debug("EINVAL: reserve field set\n"); return -EINVAL; } @@ -1586,6 +1586,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, req->common.ki_flags |= IOCB_EVENTFD; } + ret = kiocb_set_rw_flags(&req->common, iocb->aio_rw_flags); + if (unlikely(ret)) { + pr_debug("EINVAL: aio_rw_flags\n"); + goto out_put_req; + } + ret = put_user(KIOCB_KEY, &user_iocb->aio_key); if (unlikely(ret)) { pr_debug("EFAULT: aio_key\n"); diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h index bb2554f7fbd1..a2d4a8ac94ca 100644 --- a/include/uapi/linux/aio_abi.h +++ b/include/uapi/linux/aio_abi.h @@ -79,7 +79,7 @@ struct io_event { struct iocb { /* these are internal to the kernel/libc. */ __u64 aio_data; /* data to be returned in event's data */ - __u32 PADDED(aio_key, aio_reserved1); + __u32 PADDED(aio_key, aio_rw_flags); /* the kernel sets aio_key to the req # */ /* common fields */ -- 2.12.0