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OpenCloudOS-Kernel
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NFS: Optimise nfs_lookup_revalidate() 

We don't need to call nfs_revalidate_inode() on the directory if we already
know that the verifiers don't match.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-10-02 12:54:39 -04:00
parent 6d2b296686
commit f2c77f4e62
1 changed files with 8 additions and 7 deletions
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15
fs/nfs/dir.c
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@ -646,9 +646,14 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
{
if (IS_ROOT(dentry))
return 1;
if (nfs_verify_change_attribute(dir, dentry->d_time))
return 1;
return 0;
if (!nfs_verify_change_attribute(dir, dentry->d_time))
return 0;
/* Revalidate nfsi->cache_change_attribute before we declare a match */
if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
return 0;
if (!nfs_verify_change_attribute(dir, dentry->d_time))
return 0;
return 1;
}
static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
@ -742,10 +747,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
inode = dentry->d_inode;
/* Revalidate parent directory attribute cache */
if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
goto out_zap_parent;
if (!inode) {
if (nfs_neg_need_reval(dir, dentry, nd))
goto out_bad;