Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934309Ab3CUQnZ (ORCPT ); Thu, 21 Mar 2013 12:43:25 -0400 Received: from mail-pd0-f173.google.com ([209.85.192.173]:32858 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934269Ab3CUQnV (ORCPT ); Thu, 21 Mar 2013 12:43:21 -0400 X-Greylist: delayed 434 seconds by postgrey-1.27 at vger.kernel.org; Thu, 21 Mar 2013 12:43:20 EDT From: Kent Overstreet To: linux-kernel@vger.kernel.org, linux-aio@kvack.org, akpm@linux-foundation.org Cc: Kent Overstreet , Zach Brown , Felipe Balbi , Greg Kroah-Hartman , Mark Fasheh , Joel Becker , Rusty Russell , Jens Axboe , Asai Thambi S P , Selvan Mani , Sam Bradshaw , Jeff Moyer , Al Viro , Benjamin LaHaise , "Theodore Ts'o" Subject: [PATCH 07/33] aio: add kiocb_cancel() Date: Thu, 21 Mar 2013 09:35:28 -0700 Message-Id: <1363883754-27966-8-git-send-email-koverstreet@google.com> X-Mailer: git-send-email 1.8.1.3 In-Reply-To: <1363883754-27966-1-git-send-email-koverstreet@google.com> References: <1363883754-27966-1-git-send-email-koverstreet@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4244 Lines: 152 Minor refactoring, to get rid of some duplicated code [akpm@linux-foundation.org: fix warning] Signed-off-by: Kent Overstreet Cc: Zach Brown Cc: Felipe Balbi Cc: Greg Kroah-Hartman Cc: Mark Fasheh Cc: Joel Becker Cc: Rusty Russell Cc: Jens Axboe Cc: Asai Thambi S P Cc: Selvan Mani Cc: Sam Bradshaw Cc: Jeff Moyer Cc: Al Viro Cc: Benjamin LaHaise Cc: Theodore Ts'o Signed-off-by: Andrew Morton --- fs/aio.c | 79 +++++++++++++++++++++++++++++++++++----------------------------- 1 file changed, 43 insertions(+), 36 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index 6b29e41a..d291228 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -220,6 +220,29 @@ static inline void put_ioctx(struct kioctx *kioctx) __put_ioctx(kioctx); } +static int kiocb_cancel(struct kioctx *ctx, struct kiocb *kiocb, + struct io_event *res) +{ + int (*cancel)(struct kiocb *, struct io_event *); + int ret = -EINVAL; + + cancel = kiocb->ki_cancel; + kiocbSetCancelled(kiocb); + if (cancel) { + kiocb->ki_users++; + spin_unlock_irq(&ctx->ctx_lock); + + memset(res, 0, sizeof(*res)); + res->obj = (u64)(unsigned long)kiocb->ki_obj.user; + res->data = kiocb->ki_user_data; + ret = cancel(kiocb, res); + + spin_lock_irq(&ctx->ctx_lock); + } + + return ret; +} + /* ioctx_alloc * Allocates and initializes an ioctx. Returns an ERR_PTR if it failed. */ @@ -290,25 +313,19 @@ out_freectx: */ static void kill_ctx(struct kioctx *ctx) { - int (*cancel)(struct kiocb *, struct io_event *); struct task_struct *tsk = current; DECLARE_WAITQUEUE(wait, tsk); struct io_event res; + struct kiocb *req; spin_lock_irq(&ctx->ctx_lock); ctx->dead = 1; while (!list_empty(&ctx->active_reqs)) { - struct list_head *pos = ctx->active_reqs.next; - struct kiocb *iocb = list_kiocb(pos); - list_del_init(&iocb->ki_list); - cancel = iocb->ki_cancel; - kiocbSetCancelled(iocb); - if (cancel) { - iocb->ki_users++; - spin_unlock_irq(&ctx->ctx_lock); - cancel(iocb, &res); - spin_lock_irq(&ctx->ctx_lock); - } + req = list_first_entry(&ctx->active_reqs, + struct kiocb, ki_list); + + list_del_init(&req->ki_list); + kiocb_cancel(ctx, req, &res); } if (!ctx->reqs_active) @@ -1411,7 +1428,7 @@ static struct kiocb *lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb, SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb, struct io_event __user *, result) { - int (*cancel)(struct kiocb *iocb, struct io_event *res); + struct io_event res; struct kioctx *ctx; struct kiocb *kiocb; u32 key; @@ -1426,32 +1443,22 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb, return -EINVAL; spin_lock_irq(&ctx->ctx_lock); - ret = -EAGAIN; + kiocb = lookup_kiocb(ctx, iocb, key); - if (kiocb && kiocb->ki_cancel) { - cancel = kiocb->ki_cancel; - kiocb->ki_users ++; - kiocbSetCancelled(kiocb); - } else - cancel = NULL; + if (kiocb) + ret = kiocb_cancel(ctx, kiocb, &res); + else + ret = -EINVAL; + spin_unlock_irq(&ctx->ctx_lock); - if (NULL != cancel) { - struct io_event tmp; - pr_debug("calling cancel\n"); - memset(&tmp, 0, sizeof(tmp)); - tmp.obj = (u64)(unsigned long)kiocb->ki_obj.user; - tmp.data = kiocb->ki_user_data; - ret = cancel(kiocb, &tmp); - if (!ret) { - /* Cancellation succeeded -- copy the result - * into the user's buffer. - */ - if (copy_to_user(result, &tmp, sizeof(tmp))) - ret = -EFAULT; - } - } else - ret = -EINVAL; + if (!ret) { + /* Cancellation succeeded -- copy the result + * into the user's buffer. + */ + if (copy_to_user(result, &res, sizeof(res))) + ret = -EFAULT; + } put_ioctx(ctx); -- 1.8.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/