xfs: cleanup struct xfs_dir2_leaf

Simplify the confusing xfs_dir2_leaf structure.  It is supposed to describe
an XFS dir2 leaf format btree block, but due to the variable sized nature
of almost all elements in it it can't actuall do anything close to that
job.   Remove the members that are after the first variable sized array,
given that they could only be used for sizeof expressions that can as well
just use the underlying types directly, and make the ents array a real
C99 variable sized array.

Also factor out the xfs_dir2_leaf_size, to make the sizing of a leaf
entry which already was convoluted somewhat readable after using the
longer type names in the sizeof expressions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

1 files changed, 25 insertions, 9 deletions

diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c
index 067a6abdeab..5d2651f1c75 100644
--- a/fs/xfs/xfs_dir2_leaf.c
+++ b/fs/xfs/xfs_dir2_leaf.c
@@ -367,9 +367,12 @@ xfs_dir2_leaf_addname(
 	/*
 	 * How many bytes do we need in the leaf block?
 	 */
-	needbytes =
-		(leaf->hdr.stale ? 0 : (uint)sizeof(leaf->ents[0])) +
-		(use_block != -1 ? 0 : (uint)sizeof(leaf->bests[0]));
+	needbytes = 0;
+	if (!leaf->hdr.stale)
+		needbytes += sizeof(xfs_dir2_leaf_entry_t);
+	if (use_block == -1)
+		needbytes += sizeof(xfs_dir2_data_off_t);
+
 	/*
 	 * Now kill use_block if it refers to a missing block, so we
 	 * can use it as an indication of allocation needed.
@@ -1763,6 +1766,20 @@ xfs_dir2_leaf_trim_data(
 	return 0;
 }
 
+static inline size_t
+xfs_dir2_leaf_size(
+	struct xfs_dir2_leaf_hdr	*hdr,
+	int				counts)
+{
+	int			entries;
+
+	entries = be16_to_cpu(hdr->count) - be16_to_cpu(hdr->stale);
+	return sizeof(xfs_dir2_leaf_hdr_t) +
+	    entries * sizeof(xfs_dir2_leaf_entry_t) +
+	    counts * sizeof(xfs_dir2_data_off_t) +
+	    sizeof(xfs_dir2_leaf_tail_t);
+}
+
 /*
  * Convert node form directory to leaf form directory.
  * The root of the node form dir needs to already be a LEAFN block.
@@ -1844,18 +1861,17 @@ xfs_dir2_node_to_leaf(
 	free = fbp->data;
 	ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC);
 	ASSERT(!free->hdr.firstdb);
+
 	/*
 	 * Now see if the leafn and free data will fit in a leaf1.
 	 * If not, release the buffer and give up.
 	 */
-	if ((uint)sizeof(leaf->hdr) +
-	    (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale)) * (uint)sizeof(leaf->ents[0]) +
-	    be32_to_cpu(free->hdr.nvalid) * (uint)sizeof(leaf->bests[0]) +
-	    (uint)sizeof(leaf->tail) >
-	    mp->m_dirblksize) {
+	if (xfs_dir2_leaf_size(&leaf->hdr, be32_to_cpu(free->hdr.nvalid)) >
+			mp->m_dirblksize) {
 		xfs_da_brelse(tp, fbp);
 		return 0;
 	}
+
 	/*
 	 * If the leaf has any stale entries in it, compress them out.
 	 * The compact routine will log the header.
@@ -1874,7 +1890,7 @@ xfs_dir2_node_to_leaf(
 	 * Set up the leaf bests table.
 	 */
 	memcpy(xfs_dir2_leaf_bests_p(ltp), free->bests,
-		be32_to_cpu(ltp->bestcount) * sizeof(leaf->bests[0]));
+		be32_to_cpu(ltp->bestcount) * sizeof(xfs_dir2_data_off_t));
 	xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
 	xfs_dir2_leaf_log_tail(tp, lbp);
 	xfs_dir2_leaf_check(dp, lbp);