xfs: move aio completion after unwritten extent conversion

If we write into an unwritten extent using AIO we need to complete the AIO
request after the extent conversion has finished.  Without that a read could
race to see see the extent still unwritten and return zeros.   For synchronous
I/O we already take care of that by flushing the xfsconvertd workqueue (which
might be a bit of overkill).

To do that add iocb and result fields to struct xfs_ioend, so that we can
call aio_complete from xfs_end_io after the extent conversion has happened.
Note that we need a new result field as io_error is used for positive errno
values, while the AIO code can return negative error values and positive
transfer sizes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 95d1e2695c3a536218ee3f7665fbd9e7bc2c2708..13622d5ba068e999ebd91579ee5488e4f69eeba2 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -265,8 +265,11 @@ xfs_end_io(
                xfs_finish_ioend(ioend, 0);
                /* ensure we don't spin on blocked ioends */
                delay(1);
-       } else
+       } else {
+               if (ioend->io_iocb)
+                       aio_complete(ioend->io_iocb, ioend->io_result, 0);
                xfs_destroy_ioend(ioend);
+       }
 }
 
 /*
@@ -299,6 +302,8 @@ xfs_alloc_ioend(
        atomic_inc(&XFS_I(ioend->io_inode)->i_iocount);
        ioend->io_offset = 0;
        ioend->io_size = 0;
+       ioend->io_iocb = NULL;
+       ioend->io_result = 0;
 
        INIT_WORK(&ioend->io_work, xfs_end_io);
        return ioend;
@@ -1411,6 +1416,7 @@ xfs_end_io_direct(
        bool            is_async)
 {
        xfs_ioend_t     *ioend = iocb->private;
+       bool            complete_aio = is_async;
 
        /*
         * Non-NULL private data means we need to issue a transaction to
@@ -1436,7 +1442,14 @@ xfs_end_io_direct(
        if (ioend->io_type == IO_READ) {
                xfs_finish_ioend(ioend, 0);
        } else if (private && size > 0) {
-               xfs_finish_ioend(ioend, is_sync_kiocb(iocb));
+               if (is_async) {
+                       ioend->io_iocb = iocb;
+                       ioend->io_result = ret;
+                       complete_aio = false;
+                       xfs_finish_ioend(ioend, 0);
+               } else {
+                       xfs_finish_ioend(ioend, 1);
+               }
        } else {
                /*
                 * A direct I/O write ioend starts it's life in unwritten
@@ -1455,7 +1468,7 @@ xfs_end_io_direct(
         */
        iocb->private = NULL;
 
-       if (is_async)
+       if (complete_aio)
                aio_complete(iocb, ret, 0);
 }