linux-kernel - [PATCH v4 1/3] NFS: Ensure we use the correct cookie in nfs_readdir_xdr

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Message-Id: <1291654748-8921-2-git-send-email-Trond.Myklebust@netapp.com>
Date:	Mon,  6 Dec 2010 11:59:06 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Bowler <nbowler@...iptictech.com>
Cc:	Simon Kirby <sim@...tway.ca>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-nfs@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Rik van Riel <riel@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v4 1/3] NFS: Ensure we use the correct cookie in nfs_readdir_xdr_filler

We need to use the cookie from the previous array entry, not the
actual cookie that we are searching for (except for the case of
uncached_readdir).

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---
 fs/nfs/dir.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index f0a384e..e03537f 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -178,6 +178,7 @@ typedef struct {
 	struct page	*page;
 	unsigned long	page_index;
 	u64		*dir_cookie;
+	u64		last_cookie;
 	loff_t		current_index;
 	decode_dirent_t	decode;
 
@@ -344,6 +345,8 @@ int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
 	else
 		status = nfs_readdir_search_for_cookie(array, desc);
 
+	if (status == -EAGAIN)
+		desc->last_cookie = array->last_cookie;
 	nfs_readdir_release_array(desc->page);
 out:
 	return status;
@@ -563,7 +566,7 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
 	unsigned int array_size = ARRAY_SIZE(pages);
 
 	entry.prev_cookie = 0;
-	entry.cookie = *desc->dir_cookie;
+	entry.cookie = desc->last_cookie;
 	entry.eof = 0;
 	entry.fh = nfs_alloc_fhandle();
 	entry.fattr = nfs_alloc_fattr();
@@ -672,8 +675,10 @@ int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
 {
 	int res;
 
-	if (desc->page_index == 0)
+	if (desc->page_index == 0) {
 		desc->current_index = 0;
+		desc->last_cookie = 0;
+	}
 	while (1) {
 		res = find_cache_page(desc);
 		if (res != -EAGAIN)
@@ -764,6 +769,7 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
 	}
 
 	desc->page_index = 0;
+	desc->last_cookie = *desc->dir_cookie;
 	desc->page = page;
 
 	status = nfs_readdir_xdr_to_array(desc, page, inode);
-- 
1.7.3.2

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