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authorChristoph Hellwig <hch@lst.de>2015-02-11 21:59:44 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-03-13 19:10:22 +0300
commit599bd19bdc4c6b20fd91d50f2f79dececbaf80c1 (patch)
tree782dec7d04dd789c841e3798ee4c920c9493fe2c /fs/aio.c
parent9d5722b7777e64de2d932f46cfee7765fdcc60d6 (diff)
downloadlinux-599bd19bdc4c6b20fd91d50f2f79dececbaf80c1.tar.xz
fs: don't allow to complete sync iocbs through aio_complete
The AIO interface is fairly complex because it tries to allow filesystems to always work async and then wakeup a synchronous caller through aio_complete. It turns out that basically no one was doing this to avoid the complexity and context switches, and we've already fixed up the remaining users and can now get rid of this case. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/aio.c')
-rw-r--r--fs/aio.c24
1 files changed, 1 insertions, 23 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 667054c7c067..8ca8df1c3550 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -778,22 +778,6 @@ static int kill_ioctx(struct mm_struct *mm, struct kioctx *ctx,
return 0;
}
-/* wait_on_sync_kiocb:
- * Waits on the given sync kiocb to complete.
- */
-ssize_t wait_on_sync_kiocb(struct kiocb *req)
-{
- while (!req->ki_ctx) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- if (req->ki_ctx)
- break;
- io_schedule();
- }
- __set_current_state(TASK_RUNNING);
- return req->ki_user_data;
-}
-EXPORT_SYMBOL(wait_on_sync_kiocb);
-
/*
* exit_aio: called when the last user of mm goes away. At this point, there is
* no way for any new requests to be submited or any of the io_* syscalls to be
@@ -1025,13 +1009,7 @@ void aio_complete(struct kiocb *iocb, long res, long res2)
* ref, no other paths have a way to get another ref
* - the sync task helpfully left a reference to itself in the iocb
*/
- if (is_sync_kiocb(iocb)) {
- iocb->ki_user_data = res;
- smp_wmb();
- iocb->ki_ctx = ERR_PTR(-EXDEV);
- wake_up_process(iocb->ki_obj.tsk);
- return;
- }
+ BUG_ON(is_sync_kiocb(iocb));
if (iocb->ki_list.next) {
unsigned long flags;