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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: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Peter Leckie <pleckie@sgi.com>
This commit is contained in:
Lachlan McIlroy 2007-12-18 16:17:41 +11:00 committed by Lachlan McIlroy
parent c63a119036
commit c734c79bc3
1 changed files with 4 additions and 2 deletions
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6
fs/xfs/xfs_inode.c
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@ -1459,8 +1459,10 @@ 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
* overlapping the region being removed. We have to use