linux-kernel - [PATCH 06/12] f2fs: update on-disk extents even under extent

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Date:	Mon, 29 Jun 2015 11:39:30 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 06/12] f2fs: update on-disk extents even under extent_cache

Previously, f2fs_update_extent_cache() updates in-memory extent_cache all the
time, and then finally preserves its up-to-date extent into on-disk one during
f2fs_evict_inode.

But, in the following scenario:

1. mount
2. open & write an extent X
3. f2fs_evict_inode; on-disk extent is X
4. open & update the extent X with Y
5. sync; trigger checkpoint
6. power-cut

after power-on, f2fs should serve extent Y, but we have an on-disk extent X.

This causes a failure on xfstests/311.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/data.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index dd62228..1e6609b 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -899,9 +899,9 @@ void f2fs_update_extent_cache(struct dnode_of_data *dn)
 	fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
 							dn->ofs_in_node;
 
+	/* we should call update_extent_info() to update on-disk extent */
 	if (test_opt(F2FS_I_SB(dn->inode), EXTENT_CACHE))
-		return f2fs_update_extent_tree(dn->inode, fofs,
-							dn->data_blkaddr);
+		f2fs_update_extent_tree(dn->inode, fofs, dn->data_blkaddr);
 
 	if (update_extent_info(dn->inode, fofs, dn->data_blkaddr))
 		sync_inode_page(dn);
-- 
2.1.1

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