Re: [PATCH 1/5] [XFS] Use xfs_sync_inodes() for device flushing

Christoph Hellwig
2009-03-16T09:10:02Z

On Sun, Mar 15, 2009 at 10:31:43PM +1100, Dave Chinner wrote:
> index 5aeb777..08be36d 100644
> --- a/fs/xfs/linux-2.6/xfs_fs_subr.c
> +++ b/fs/xfs/linux-2.6/xfs_fs_subr.c
> @@ -74,14 +74,14 @@ xfs_flush_pages(
>
> if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
> xfs_iflags_clear(ip, XFS_ITRUNCATED);
> - ret = filemap_fdatawrite(mapping);
> - if (flags & XFS_B_ASYNC)
> - return -ret;
> - ret2 = filemap_fdatawait(mapping);
> - if (!ret)
> - ret = ret2;
> + ret = -filemap_fdatawrite(mapping);
> }
> - return -ret;
> + if (flags & XFS_B_ASYNC)
> + return ret;
> + ret2 = xfs_wait_on_pages(ip, first, last);
> + if (!ret)
> + ret = ret2;
> + return ret;
> }

How does this belong into this patch series?

Also I think the sync code should just use filemap_fdatawait and
filemap_fdatawait directly. It's at a high enough level that we don't
need all these obsfucations.

> + if (flags & SYNC_DELWRI) {
> + if (VN_DIRTY(inode)) {
> + if (flags & SYNC_TRYLOCK) {
> + if (xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED))
> + lock_flags |= XFS_IOLOCK_SHARED;
> + } else {
> + xfs_ilock(ip, XFS_IOLOCK_SHARED);
> + lock_flags |= XFS_IOLOCK_SHARED;
> + }

> + if (lock_flags & XFS_IOLOCK_SHARED) {

Too long line and pretty ugly use of the lock_flags variable, but given
that it gets sorted out in the sync series I think we can leave it that way.