Commit b0b53973 authored May 05, 2008 by Trond Myklebust

NFS: Ensure that 'noac' and/or 'actimeo=0' turn off attribute caching

Both the 'noac' and 'actimeo=0' mount options should ensure that attributes
are not cached, however a bug in nfs_attribute_timeout() means that
currently, the attributes may in fact get cached for up to one jiffy. This
has been seen to cause corruption in some applications.

The reason for the bug is that the time_in_range() test returns 'true' as
long as the current time lies between nfsi->read_cache_jiffies and
nfsi->read_cache_jiffies + nfsi->attrtimeo. In other words, if jiffies
equals nfsi->read_cache_jiffies, then we still cache the attribute data.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

parent f26a3988

fs/nfs/inode.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -707,6 +707,13 @@ int nfs_attribute_timeout(struct inode *inode)

		if (nfs_have_delegation(inode, FMODE_READ))
		return 0;
		/*
		* Special case: if the attribute timeout is set to 0, then always
		* treat the cache as having expired (unless holding
		* a delegation).
		*/
		if (nfsi->attrtimeo == 0)
		return 1;
		return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
		}