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Commit c734c79b authored by Lachlan McIlroy's avatar Lachlan McIlroy Committed by Lachlan McIlroy
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[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: default avatarLachlan McIlroy <lachlan@sgi.com>
Signed-off-by: default avatarPeter 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