Commit c734c79b authored Dec 18, 2007 by Lachlan McIlroy Committed by Lachlan McIlroy Dec 18, 2007

[XFS] Don't wait for pending I/Os when purging blocks beyond eof.



On last close of a file we purge blocks beyond eof. The same code is used
when we truncate the file size down. In this case we need to wait for any
pending I/Os for dirty pages beyond the new eof. For the last close case
we are not changing the file size and therefore do not need to wait for
any I/Os to complete. This fixes a performance bottleneck where writes
into the page cache and cache flushes can become mutually exclusive.

SGI-PV: 964002
SGI-Modid: xfs-linux-melb:xfs-kern:30220a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Peter Leckie <pleckie@sgi.com>

parent c63a1190

fs/xfs/xfs_inode.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -1459,7 +1459,9 @@ xfs_itruncate_start(
		mp = ip->i_mount;
		vp = XFS_ITOV(ip);

		vn_iowait(ip); /* wait for the completion of any pending DIOs */
		/* wait for the completion of any pending DIOs */
		if (new_size < ip->i_size)
		vn_iowait(ip);

		/*
		* Call toss_pages or flushinval_pages to get rid of pages

Admin message