xfs: kill struct xfs_dir2_data

Remove the confusing xfs_dir2_data structure.  It is supposed to describe
an XFS dir2 data 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.  In addition to accessing the fixed offset header structure it was
only used to get a pointer to the first dir or unused entry after it,
which can be trivially replaced by pointer arithmetics on the header
pointer.  For most users that is actually more natural anyway, as they
don't use a typed pointer but rather a character pointer for further
arithmetics.

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, 5 insertions, 10 deletions

diff --git a/fs/xfs/xfs_dir2_data.c b/fs/xfs/xfs_dir2_data.c
index 2bbc216..8e47ac3 100644
--- a/fs/xfs/xfs_dir2_data.c
+++ b/fs/xfs/xfs_dir2_data.c
@@ -53,7 +53,6 @@ xfs_dir2_data_check(
 	xfs_dir2_data_free_t	*bf;		/* bestfree table */
 	xfs_dir2_block_tail_t	*btp=NULL;	/* block tail */
 	int			count;		/* count of entries found */
-	xfs_dir2_data_t		*d;		/* data block pointer */
 	xfs_dir2_data_hdr_t	*hdr;		/* data block header */
 	xfs_dir2_data_entry_t	*dep;		/* data entry */
 	xfs_dir2_data_free_t	*dfp;		/* bestfree entry */
@@ -70,10 +69,9 @@ xfs_dir2_data_check(
 	struct xfs_name		name;
 
 	mp = dp->i_mount;
-	d = bp->data;
-	hdr = &d->hdr;
+	hdr = bp->data;
 	bf = hdr->bestfree;
-	p = (char *)d->u;
+	p = (char *)(hdr + 1);
 
 	if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
 		btp = xfs_dir2_block_tail_p(mp, hdr);
@@ -336,7 +334,6 @@ xfs_dir2_data_freescan(
 	xfs_dir2_data_hdr_t	*hdr,		/* data block header */
 	int			*loghead)	/* out: log data header */
 {
-	xfs_dir2_data_t		*d = (xfs_dir2_data_t *)hdr;
 	xfs_dir2_block_tail_t	*btp;		/* block tail */
 	xfs_dir2_data_entry_t	*dep;		/* active data entry */
 	xfs_dir2_data_unused_t	*dup;		/* unused data entry */
@@ -355,7 +352,7 @@ xfs_dir2_data_freescan(
 	/*
 	 * Set up pointers.
 	 */
-	p = (char *)d->u;
+	p = (char *)(hdr + 1);
 	if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
 		btp = xfs_dir2_block_tail_p(mp, hdr);
 		endp = (char *)xfs_dir2_block_leaf_p(btp);
@@ -398,7 +395,6 @@ xfs_dir2_data_init(
 	xfs_dabuf_t		**bpp)		/* output block buffer */
 {
 	xfs_dabuf_t		*bp;		/* block buffer */
-	xfs_dir2_data_t		*d;		/* pointer to block */
 	xfs_dir2_data_hdr_t	*hdr;		/* data block header */
 	xfs_inode_t		*dp;		/* incore directory inode */
 	xfs_dir2_data_unused_t	*dup;		/* unused entry pointer */
@@ -424,8 +420,7 @@ xfs_dir2_data_init(
 	/*
 	 * Initialize the header.
 	 */
-	d = bp->data;
-	hdr = &d->hdr;
+	hdr = bp->data;
 	hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
 	hdr->bestfree[0].offset = cpu_to_be16(sizeof(*hdr));
 	for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) {
@@ -436,7 +431,7 @@ xfs_dir2_data_init(
 	/*
 	 * Set up an unused entry for the block's body.
 	 */
-	dup = &d->u[0].unused;
+	dup = (xfs_dir2_data_unused_t *)(hdr + 1);
 	dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
 
 	t = mp->m_dirblksize - (uint)sizeof(*hdr);