xfs: make if_data a void pointer

The xfs_ifork structure currently has a union of the if_root void pointer
and the if_data char pointer.  In either case it is an opaque pointer
that depends on the fork format.  Replace the union with a single if_data
void pointer as that is what almost all callers want.  Only the symlink
NULL termination code in xfs_init_local_fork actually needs a new local
variable now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

1 files changed, 24 insertions, 37 deletions

diff --git a/fs/xfs/libxfs/xfs_dir2_sf.c b/fs/xfs/libxfs/xfs_dir2_sf.c
index 870ef1d1ebe4..0b63138d2b9f 100644
--- a/fs/xfs/libxfs/xfs_dir2_sf.c
+++ b/fs/xfs/libxfs/xfs_dir2_sf.c
@@ -364,25 +364,23 @@ int						/* error */
 xfs_dir2_sf_addname(
 	xfs_da_args_t		*args)		/* operation arguments */
 {
-	xfs_inode_t		*dp;		/* incore directory inode */
+	struct xfs_inode	*dp = args->dp;
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			error;		/* error return value */
 	int			incr_isize;	/* total change in size */
 	int			new_isize;	/* size after adding name */
 	int			objchange;	/* changing to 8-byte inodes */
 	xfs_dir2_data_aoff_t	offset = 0;	/* offset for new entry */
 	int			pick;		/* which algorithm to use */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
 	xfs_dir2_sf_entry_t	*sfep = NULL;	/* shortform entry */
 
 	trace_xfs_dir2_sf_addname(args);
 
 	ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
-	dp = args->dp;
 	ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
 	ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
 	ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
-	ASSERT(dp->i_df.if_u1.if_data != NULL);
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	ASSERT(sfp != NULL);
 	ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 	/*
 	 * Compute entry (and change in) size.
@@ -462,11 +460,9 @@ xfs_dir2_sf_addname_easy(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
-	int			byteoff;	/* byte offset in sf dir */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
+	int			byteoff = (int)((char *)sfep - (char *)sfp);
 
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
-	byteoff = (int)((char *)sfep - (char *)sfp);
 	/*
 	 * Grow the in-inode space.
 	 */
@@ -475,7 +471,7 @@ xfs_dir2_sf_addname_easy(
 	/*
 	 * Need to set up again due to realloc of the inode data.
 	 */
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
 	/*
 	 * Fill in the new entry.
@@ -528,11 +524,10 @@ xfs_dir2_sf_addname_hard(
 	/*
 	 * Copy the old directory to the stack buffer.
 	 */
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 	old_isize = (int)dp->i_disk_size;
 	buf = kmem_alloc(old_isize, 0);
 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
-	memcpy(oldsfp, sfp, old_isize);
+	memcpy(oldsfp, dp->i_df.if_data, old_isize);
 	/*
 	 * Loop over the old directory finding the place we're going
 	 * to insert the new entry.
@@ -560,7 +555,7 @@ xfs_dir2_sf_addname_hard(
 	/*
 	 * Reset the pointer since the buffer was reallocated.
 	 */
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	/*
 	 * Copy the first part of the directory, including the header.
 	 */
@@ -610,11 +605,10 @@ xfs_dir2_sf_addname_pick(
 	int			i;		/* entry number */
 	xfs_dir2_data_aoff_t	offset;		/* data block offset */
 	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			size;		/* entry's data size */
 	int			used;		/* data bytes used */
 
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 	size = xfs_dir2_data_entsize(mp, args->namelen);
 	offset = args->geo->data_first_offset;
 	sfep = xfs_dir2_sf_firstentry(sfp);
@@ -673,14 +667,13 @@ xfs_dir2_sf_check(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			i;		/* entry number */
 	int			i8count;	/* number of big inode#s */
 	xfs_ino_t		ino;		/* entry inode number */
 	int			offset;		/* data offset */
 	xfs_dir2_sf_entry_t	*sfep;		/* shortform dir entry */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
 
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 	offset = args->geo->data_first_offset;
 	ino = xfs_dir2_sf_get_parent_ino(sfp);
 	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
@@ -834,7 +827,7 @@ xfs_dir2_sf_create(
 	/*
 	 * Fill in the header,
 	 */
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	sfp->i8count = i8count;
 	/*
 	 * Now can put in the inode number, since i8count is set.
@@ -857,9 +850,9 @@ xfs_dir2_sf_lookup(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			i;		/* entry index */
 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
 	enum xfs_dacmp		cmp;		/* comparison result */
 	xfs_dir2_sf_entry_t	*ci_sfep;	/* case-insens. entry */
 
@@ -870,8 +863,7 @@ xfs_dir2_sf_lookup(
 	ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
 	ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
 	ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
-	ASSERT(dp->i_df.if_u1.if_data != NULL);
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	ASSERT(sfp != NULL);
 	ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 	/*
 	 * Special case for .
@@ -933,13 +925,13 @@ xfs_dir2_sf_removename(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			byteoff;	/* offset of removed entry */
 	int			entsize;	/* this entry's size */
 	int			i;		/* shortform entry index */
 	int			newsize;	/* new inode size */
 	int			oldsize;	/* old inode size */
 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
 
 	trace_xfs_dir2_sf_removename(args);
 
@@ -947,8 +939,7 @@ xfs_dir2_sf_removename(
 	oldsize = (int)dp->i_disk_size;
 	ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));
 	ASSERT(dp->i_df.if_bytes == oldsize);
-	ASSERT(dp->i_df.if_u1.if_data != NULL);
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	ASSERT(sfp != NULL);
 	ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
 	/*
 	 * Loop over the old directory entries.
@@ -989,7 +980,7 @@ xfs_dir2_sf_removename(
 	 * Reallocate, making it smaller.
 	 */
 	xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	/*
 	 * Are we changing inode number size?
 	 */
@@ -1012,13 +1003,12 @@ xfs_dir2_sf_replace_needblock(
 	struct xfs_inode	*dp,
 	xfs_ino_t		inum)
 {
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			newsize;
-	struct xfs_dir2_sf_hdr	*sfp;
 
 	if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL)
 		return false;
 
-	sfp = (struct xfs_dir2_sf_hdr *)dp->i_df.if_u1.if_data;
 	newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
 
 	return inum > XFS_DIR2_MAX_SHORT_INUM &&
@@ -1034,19 +1024,18 @@ xfs_dir2_sf_replace(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*sfp = dp->i_df.if_data;
 	int			i;		/* entry index */
 	xfs_ino_t		ino=0;		/* entry old inode number */
 	int			i8elevated;	/* sf_toino8 set i8count=1 */
 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
-	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
 
 	trace_xfs_dir2_sf_replace(args);
 
 	ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
 	ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
 	ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
-	ASSERT(dp->i_df.if_u1.if_data != NULL);
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	ASSERT(sfp != NULL);
 	ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
 
 	/*
@@ -1069,7 +1058,7 @@ xfs_dir2_sf_replace(
 		 */
 		xfs_dir2_sf_toino8(args);
 		i8elevated = 1;
-		sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+		sfp = dp->i_df.if_data;
 	} else
 		i8elevated = 0;
 
@@ -1150,11 +1139,11 @@ xfs_dir2_sf_toino4(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*oldsfp = dp->i_df.if_data;
 	char			*buf;		/* old dir's buffer */
 	int			i;		/* entry index */
 	int			newsize;	/* new inode size */
 	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
-	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
 	int			oldsize;	/* old inode size */
 	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
 	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */
@@ -1168,7 +1157,6 @@ xfs_dir2_sf_toino4(
 	 */
 	oldsize = dp->i_df.if_bytes;
 	buf = kmem_alloc(oldsize, 0);
-	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 	ASSERT(oldsfp->i8count == 1);
 	memcpy(buf, oldsfp, oldsize);
 	/*
@@ -1181,7 +1169,7 @@ xfs_dir2_sf_toino4(
 	 * Reset our pointers, the data has moved.
 	 */
 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	/*
 	 * Fill in the new header.
 	 */
@@ -1223,11 +1211,11 @@ xfs_dir2_sf_toino8(
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_dir2_sf_hdr	*oldsfp = dp->i_df.if_data;
 	char			*buf;		/* old dir's buffer */
 	int			i;		/* entry index */
 	int			newsize;	/* new inode size */
 	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
-	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
 	int			oldsize;	/* old inode size */
 	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
 	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */
@@ -1241,7 +1229,6 @@ xfs_dir2_sf_toino8(
 	 */
 	oldsize = dp->i_df.if_bytes;
 	buf = kmem_alloc(oldsize, 0);
-	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 	ASSERT(oldsfp->i8count == 0);
 	memcpy(buf, oldsfp, oldsize);
 	/*
@@ -1254,7 +1241,7 @@ xfs_dir2_sf_toino8(
 	 * Reset our pointers, the data has moved.
 	 */
 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
-	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	sfp = dp->i_df.if_data;
 	/*
 	 * Fill in the new header.
 	 */