From: Christoph Hellwig <hch@lst.de>
To: viro@zeniv.linux.org.uk
Cc: Avi Kivity <avi@scylladb.com>,
linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
netdev@vger.kernel.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 06/32] aio: simplify KIOCB_KEY handling
Date: Fri, 11 May 2018 13:07:37 +0200 [thread overview]
Message-ID: <20180511110803.10910-7-hch@lst.de> (raw)
In-Reply-To: <20180511110803.10910-1-hch@lst.de>
No need to pass the key field to lookup_iocb to compare it with KIOCB_KEY,
as we can do that right after retrieving it from userspace. Also move the
KIOCB_KEY definition to aio.c as it is an internal value not used by any
other place in the kernel.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/aio.c | 14 +++++++-------
include/linux/aio.h | 2 --
2 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index f3eae5d5771b..2e0bc04f7920 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -46,6 +46,8 @@
#include "internal.h"
+#define KIOCB_KEY 0
+
#define AIO_RING_MAGIC 0xa10a10a1
#define AIO_RING_COMPAT_FEATURES 1
#define AIO_RING_INCOMPAT_FEATURES 0
@@ -1812,15 +1814,12 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
* Finds a given iocb for cancellation.
*/
static struct aio_kiocb *
-lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb, u32 key)
+lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb)
{
struct aio_kiocb *kiocb;
assert_spin_locked(&ctx->ctx_lock);
- if (key != KIOCB_KEY)
- return NULL;
-
/* TODO: use a hash or array, this sucks. */
list_for_each_entry(kiocb, &ctx->active_reqs, ki_list) {
if (kiocb->ki_user_iocb == iocb)
@@ -1847,9 +1846,10 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
u32 key;
int ret;
- ret = get_user(key, &iocb->aio_key);
- if (unlikely(ret))
+ if (unlikely(get_user(key, &iocb->aio_key)))
return -EFAULT;
+ if (unlikely(key != KIOCB_KEY))
+ return -EINVAL;
ctx = lookup_ioctx(ctx_id);
if (unlikely(!ctx))
@@ -1857,7 +1857,7 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
spin_lock_irq(&ctx->ctx_lock);
- kiocb = lookup_kiocb(ctx, iocb, key);
+ kiocb = lookup_kiocb(ctx, iocb);
if (kiocb)
ret = kiocb_cancel(kiocb);
else
diff --git a/include/linux/aio.h b/include/linux/aio.h
index 9d8aabecfe2d..b83e68dd006f 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -8,8 +8,6 @@ struct kioctx;
struct kiocb;
struct mm_struct;
-#define KIOCB_KEY 0
-
typedef int (kiocb_cancel_fn)(struct kiocb *);
/* prototypes */
--
2.17.0
next prev parent reply other threads:[~2018-05-11 11:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-11 11:07 aio poll and a new in-kernel poll API V10 Christoph Hellwig
2018-05-11 11:07 ` [PATCH 01/32] fs: unexport poll_schedule_timeout Christoph Hellwig
2018-05-11 11:07 ` [PATCH 02/32] fs: cleanup do_pollfd Christoph Hellwig
2018-05-11 11:07 ` [PATCH 03/32] fs: update documentation to mention __poll_t and match the code Christoph Hellwig
2018-05-11 11:07 ` [PATCH 04/32] fs: add new vfs_poll and file_can_poll helpers Christoph Hellwig
2018-05-11 11:07 ` [PATCH 05/32] fs: introduce new ->get_poll_head and ->poll_mask methods Christoph Hellwig
2018-05-11 11:07 ` Christoph Hellwig [this message]
2018-05-11 11:07 ` [PATCH 07/32] aio: simplify cancellation Christoph Hellwig
2018-05-11 11:07 ` [PATCH 08/32] aio: replace kiocb_set_cancel_fn with a cancel_kiocb file operation Christoph Hellwig
2018-05-11 11:07 ` [PATCH 09/32] aio: add delayed cancel support Christoph Hellwig
2018-05-11 11:07 ` [PATCH 10/32] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-05-11 11:07 ` [PATCH 11/32] net: refactor socket_poll Christoph Hellwig
2018-05-11 11:07 ` [PATCH 12/32] net: add support for ->poll_mask in proto_ops Christoph Hellwig
2018-05-11 11:07 ` [PATCH 13/32] net: remove sock_no_poll Christoph Hellwig
2018-05-11 11:07 ` [PATCH 14/32] net/tcp: convert to ->poll_mask Christoph Hellwig
2018-05-11 13:13 ` Eric Dumazet
2018-05-12 10:09 ` Christoph Hellwig
2018-05-11 11:07 ` [PATCH 15/32] net/unix: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 16/32] net: convert datagram_poll users tp ->poll_mask Christoph Hellwig
2018-05-11 11:07 ` [PATCH 17/32] net/dccp: convert to ->poll_mask Christoph Hellwig
2018-05-11 11:07 ` [PATCH 18/32] net/atm: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 19/32] net/vmw_vsock: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 20/32] net/tipc: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 21/32] net/sctp: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 22/32] net/bluetooth: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 23/32] net/caif: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 24/32] net/nfc: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 25/32] net/phonet: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 26/32] net/iucv: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 27/32] net/rxrpc: " Christoph Hellwig
2018-05-11 11:07 ` [PATCH 28/32] crypto: af_alg: " Christoph Hellwig
2018-05-11 11:08 ` [PATCH 29/32] pipe: " Christoph Hellwig
2018-05-11 11:08 ` [PATCH 30/32] eventfd: switch " Christoph Hellwig
2018-05-11 11:08 ` [PATCH 31/32] timerfd: convert " Christoph Hellwig
2018-05-11 11:08 ` [PATCH 32/32] random: " Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2018-05-15 19:48 aio poll and a new in-kernel poll API V11 Christoph Hellwig
2018-05-15 19:48 ` [PATCH 06/32] aio: simplify KIOCB_KEY handling Christoph Hellwig
2018-03-30 15:07 aio poll and a new in-kernel poll API V9 Christoph Hellwig
2018-03-30 15:07 ` [PATCH 06/32] aio: simplify KIOCB_KEY handling Christoph Hellwig
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