NFS: Fix atime revalidation in readdir()

NFSv3 will correctly update atime on a readdir call, so there is no need to
set the NFS_INO_INVALID_ATIME flag unless the call to nfs_refresh_inode()
fails.

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

6 files changed, 16 insertions, 6 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 9f8ec3c3e6a7..07df192e23a0 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -200,9 +200,6 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
         desc->timestamp = timestamp;
         desc->timestamp_valid = 1;
         SetPageUptodate(page);
-        spin_lock(&inode->i_lock);
-        NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
-        spin_unlock(&inode->i_lock);
         /* Ensure consistent page alignment of the data.
          * Note: assumes we have exclusive access to this mapping either
          *       through inode->i_mutex or some other mechanism.
@@ -490,9 +487,6 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
                                                 page,
                                                 NFS_SERVER(inode)->dtsize,
                                                 desc->plus);
-        spin_lock(&inode->i_lock);
-        NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
-        spin_unlock(&inode->i_lock);
         desc->page = page;
         desc->ptr = kmap(page);         /* matching kunmap in nfs_do_filldir */
         if (desc->error >= 0) {
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index cd57f795229e..e37faa3a7bac 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -156,6 +156,13 @@ static void nfs_zap_acl_cache(struct inode *inode)
         spin_unlock(&inode->i_lock);
 }
 
+void nfs_invalidate_atime(struct inode *inode)
+{
+        spin_lock(&inode->i_lock);
+        NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
+        spin_unlock(&inode->i_lock);
+}
+
 /*
  * Invalidate, but do not unhash, the inode.
  * NB: must be called with inode->i_lock held!
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index c7ca5d70870b..0ae263cdedc6 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -607,6 +607,9 @@ nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 
         nfs_fattr_init(&dir_attr);
         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+
+        nfs_invalidate_atime(dir);
+
         nfs_refresh_inode(dir, &dir_attr);
         dprintk("NFS reply readdir: %d\n", status);
         return status;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 871c102d9bdf..9c27a6ed1a62 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2197,6 +2197,9 @@ static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
         if (status == 0)
                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
+
+        nfs_invalidate_atime(dir);
+
         dprintk("%s: returns %d\n", __FUNCTION__, status);
         return status;
 }
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 845cdde1d8b7..cfc4130f2aec 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -476,6 +476,8 @@ nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 
+        nfs_invalidate_atime(dir);
+
         dprintk("NFS reply readdir: %d\n", status);
         return status;
 }
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index fd2c5c8158cf..63850a884902 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -288,6 +288,7 @@ static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long
 extern int nfs_sync_mapping(struct address_space *mapping);
 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 extern void nfs_zap_caches(struct inode *);
+extern void nfs_invalidate_atime(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
                                 struct nfs_fattr *);
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);