linux-kernel - [PATCH 16/28] FS-Cache: Don't delete pending pages from the page-store tracking tree

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Message-ID: <20091119172156.1679.87264.stgit@warthog.procyon.org.uk>
Date:	Thu, 19 Nov 2009 17:21:56 +0000
From:	David Howells <dhowells@...hat.com>
To:	linux-cachefs@...hat.com, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org
Cc:	dhowells@...hat.com, steved@...hat.com
Subject: [PATCH 16/28] FS-Cache: Don't delete pending pages from the
	page-store tracking tree

Don't delete pending pages from the page-store tracking tree, but rather send
them for another write as they've presumably been updated.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/fscache/page.c |    7 +++++--
 lib/radix-tree.c  |    2 --
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 3ea8897..022a5da 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -57,8 +57,11 @@ static void fscache_end_page_write(struct fscache_object *object,
 		/* delete the page from the tree if it is now no longer
 		 * pending */
 		spin_lock(&cookie->stores_lock);
-		fscache_stat(&fscache_n_store_radix_deletes);
-		xpage = radix_tree_delete(&cookie->stores, page->index);
+		if (!radix_tree_tag_get(&cookie->stores, page->index,
+					FSCACHE_COOKIE_PENDING_TAG)) {
+			fscache_stat(&fscache_n_store_radix_deletes);
+			xpage = radix_tree_delete(&cookie->stores, page->index);
+		}
 		spin_unlock(&cookie->stores_lock);
 		wake_up_bit(&cookie->flags, 0);
 	}
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index ae61068..92cdd99 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -546,7 +546,6 @@ out:
 }
 EXPORT_SYMBOL(radix_tree_tag_clear);
 
-#ifndef __KERNEL__	/* Only the test harness uses this at present */
 /**
  * radix_tree_tag_get - get a tag on a radix tree node
  * @root:		radix tree root
@@ -609,7 +608,6 @@ int radix_tree_tag_get(struct radix_tree_root *root,
 	}
 }
 EXPORT_SYMBOL(radix_tree_tag_get);
-#endif
 
 /**
  *	radix_tree_next_hole    -    find the next hole (not-present entry)

--
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