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Message-Id: <1237320082-12921-14-git-send-email-mfasheh@suse.com>
Date: Tue, 17 Mar 2009 13:01:03 -0700
From: Mark Fasheh <mfasheh@...e.com>
To: linux-kernel@...r.kernel.org
Cc: ocfs2-devel@....oracle.com, Joel Becker <joel.becker@...cle.com>,
Mark Fasheh <mfasheh@...e.com>
Subject: [PATCH 13/32] ocfs2: fix leaf start calculation in ocfs2_dx_dir_rebalance()
ocfs2_dx_dir_rebalance() is passed the block offset of a dx leaf which needs
rebalancing. Since we rebalance an entire cluster at a time however, this
function needs to calculate the beginning of that cluster, in blocks. The
calculation was wrong, which would result in a read of non-leaf blocks. Fix
the calculation by adding ocfs2_block_to_cluster_start() which is a more
straight-forward way of determining this.
Reported-by: Tristan Ye <tristan.ye@...cle.com>
Signed-off-by: Mark Fasheh <mfasheh@...e.com>
---
fs/ocfs2/dir.c | 3 +--
fs/ocfs2/ocfs2.h | 10 ++++++++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 5e6aeb0..e71160c 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -3941,8 +3941,7 @@ static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
goto out_commit;
}
- orig_leaves_start = leaf_blkno & ~(osb->s_clustersize_bits -
- osb->sb->s_blocksize_bits);
+ orig_leaves_start = ocfs2_block_to_cluster_start(dir->i_sb, leaf_blkno);
ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves,
orig_dx_leaves);
if (ret) {
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index fa3c6d3..e1844d5 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -582,6 +582,16 @@ static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
}
+static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
+ u64 blocks)
+{
+ int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
+ unsigned int clusters;
+
+ clusters = ocfs2_blocks_to_clusters(sb, blocks);
+ return (u64)clusters << bits;
+}
+
static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
u64 bytes)
{
--
1.5.6
--
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