NFS: O_DIRECT needs to use a completion
Now that we have aio writes, it is possible for dreq->outstanding to be
zero, but for the I/O not to have completed. Convert struct nfs_direct_req
to use a completion to signal when the I/O is done.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 5883042..cbef57a 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -72,7 +72,6 @@
rewrite_list; /* saved nfs_write_data structs */
struct nfs_open_context *ctx; /* file open context info */
struct kiocb * iocb; /* controlling i/o request */
- wait_queue_head_t wait; /* wait for i/o completion */
struct inode * inode; /* target file of i/o */
unsigned long user_addr; /* location of user's buffer */
size_t user_count; /* total bytes to move */
@@ -85,6 +84,7 @@
int outstanding; /* i/os we're waiting for */
ssize_t count, /* bytes actually processed */
error; /* any reported error */
+ struct completion completion; /* wait for i/o completion */
/* commit state */
struct nfs_write_data * commit_data; /* special write_data for commits */
@@ -175,7 +175,7 @@
return NULL;
kref_init(&dreq->kref);
- init_waitqueue_head(&dreq->wait);
+ init_completion(&dreq->completion);
INIT_LIST_HEAD(&dreq->list);
INIT_LIST_HEAD(&dreq->rewrite_list);
dreq->iocb = NULL;
@@ -209,7 +209,7 @@
if (dreq->iocb)
goto out;
- result = wait_event_interruptible(dreq->wait, (dreq->outstanding == 0));
+ result = wait_for_completion_interruptible(&dreq->completion);
if (!result)
result = dreq->error;
@@ -239,8 +239,8 @@
if (!res)
res = (long) dreq->count;
aio_complete(dreq->iocb, res, 0);
- } else
- wake_up(&dreq->wait);
+ }
+ complete_all(&dreq->completion);
kref_put(&dreq->kref, nfs_direct_req_release);
}