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ocfs2: fix leaf start calculation in ocfs2_dx_dir_rebalance()

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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@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Mark Fasheh
2009-02-19 13:17:05 -08:00
parent b80b549c35
commit 1d46dc08d3
2 changed files with 11 additions and 2 deletions
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10
fs/ocfs2/ocfs2.h
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@@ -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)
{