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xfs: move aio completion after unwritten extent conversion

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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>
This commit is contained in:
Christoph Hellwig 2010-07-18 21:17:10 +00:00 committed by Alex Elder
parent 40e2e97316
commit fb511f2150
1 changed files with 16 additions and 3 deletions
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19
fs/xfs/linux-2.6/xfs_aops.c
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@ -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);
}