NFS: fix nfs_verify_change_attribute

We always want to check that the verifier and directory
cache_change_attribute match. This also allows us to remove the 'wraparound
hack' for the cache_change_attribute. If we're only checking for equality,
then we don't care about wraparound issues.

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

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 0d98074..ed035a8 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -972,10 +972,6 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        nfsi->read_cache_jiffies = fattr->time_start;
        nfsi->last_updated = now;
 
-       /* Fix a wraparound issue with nfsi->cache_change_attribute */
-       if (time_before(now, nfsi->cache_change_attribute))
-               nfsi->cache_change_attribute = now - 600*HZ;
-
        /* Are we racing with known updates of the metadata on the server? */
        data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
        nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 5b42fef..f451613 100644 (file)
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -277,7 +277,7 @@ static inline long nfs_save_change_attribute(struct inode *inode)
 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 {
        return !nfs_caches_unstable(inode)
-               && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
+               && chattr == NFS_I(inode)->cache_change_attribute;
 }
 
 /*