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authorPeter Staubach <staubach@redhat.com>2008-12-23 15:21:56 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-12-23 15:21:56 -0500
commit64672d55d93c26fb4035fd1a84a803cbc09cb058 (patch)
tree6873f9335b925e4c6a5336544a6f6fc1d789604f /fs/nfs/inode.c
parentdc0b027dfadfcb8a5504f7d8052754bf8d501ab9 (diff)
optimize attribute timeouts for "noac" and "actimeo=0"
Hi. I've been looking at a bugzilla which describes a problem where a customer was advised to use either the "noac" or "actimeo=0" mount options to solve a consistency problem that they were seeing in the file attributes. It turned out that this solution did not work reliably for them because sometimes, the local attribute cache was believed to be valid and not timed out. (With an attribute cache timeout of 0, the cache should always appear to be timed out.) In looking at this situation, it appears to me that the problem is that the attribute cache timeout code has an off-by-one error in it. It is assuming that the cache is valid in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo]. The cache should be considered valid only in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo). With this change, the options, "noac" and "actimeo=0", work as originally expected. This problem was previously addressed by special casing the attrtimeo == 0 case. However, since the problem is only an off- by-one error, the cleaner solution is address the off-by-one error and thus, not require the special case. Thanx... ps Signed-off-by: Peter Staubach <staubach@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/inode.c')
-rw-r--r--fs/nfs/inode.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 1cf39202c3e..0c381686171 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -712,14 +712,7 @@ 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);
+ return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
}
/**
@@ -1182,7 +1175,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
nfsi->attrtimeo_timestamp = now;
nfsi->attr_gencount = nfs_inc_attr_generation_counter();
} else {
- if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
+ if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = now;