From: Trond Myklebust Date: Tue, 16 Jan 2007 10:09:44 -0500 NFS: Also use readdir info to revalidate positive dentries If the fileid of the cached dentry fails to match that returned by the readdir call, then we should also d_drop. Try to take into account the fact that on NFSv4, readdir may return the "mounted_on_fileid" by looking for submounts. Signed-off-by: Trond Myklebust --- fs/nfs/dir.c | 14 +++++++++++--- 1 files changed, 11 insertions(+), 3 deletions(-) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index db29c7f..062e108 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1124,9 +1124,16 @@ static struct dentry *nfs_readdir_lookup name.hash = full_name_hash(name.name, name.len); dentry = d_lookup(parent, &name); if (dentry != NULL) { - /* Is this a positive dentry? */ - if (dentry->d_inode != NULL) - return dentry; + /* Is this a positive dentry that matches the readdir info? */ + if (dentry->d_inode != NULL && + (NFS_FILEID(dentry->d_inode) == entry->ino || + d_mountpoint(dentry))) { + if (!desc->plus || entry->fh->size == 0) + return dentry; + if (nfs_compare_fh(NFS_FH(dentry->d_inode), + entry->fh) == 0) + goto out_renew; + } /* No, so d_drop to allow one to be created */ d_drop(dentry); dput(dentry); @@ -1152,6 +1159,7 @@ static struct dentry *nfs_readdir_lookup dentry = alias; } +out_renew: nfs_renew_times(dentry); nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); return dentry;