path: root/fs/xfs/xfs_dir2_sf.c

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_error.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_trace.h"
#include "xfs_dinode.h"

/*
 * Prototypes for internal functions.
 */
static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
				     xfs_dir2_sf_entry_t *sfep,
				     xfs_dir2_data_aoff_t offset,
				     int new_isize);
static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
				     int new_isize);
static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
				    xfs_dir2_sf_entry_t **sfepp,
				    xfs_dir2_data_aoff_t *offsetp);
#ifdef DEBUG
static void xfs_dir2_sf_check(xfs_da_args_t *args);
#else
#define	xfs_dir2_sf_check(args)
#endif /* DEBUG */
#if XFS_BIG_INUMS
static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
#endif /* XFS_BIG_INUMS */

/*
 * Given a block directory (dp/block), calculate its size as a shortform (sf)
 * directory and a header for the sf directory, if it will fit it the
 * space currently present in the inode.  If it won't fit, the output
 * size is too big (but not accurate).
 */
int						/* size for sf form */
xfs_dir2_block_sfsize(
	xfs_inode_t		*dp,		/* incore inode pointer */
	xfs_dir2_data_hdr_t	*hdr,		/* block directory data */
	xfs_dir2_sf_hdr_t	*sfhp)		/* output: header for sf form */
{
	xfs_dir2_dataptr_t	addr;		/* data entry address */
	xfs_dir2_leaf_entry_t	*blp;		/* leaf area of the block */
	xfs_dir2_block_tail_t	*btp;		/* tail area of the block */
	int			count;		/* shortform entry count */
	xfs_dir2_data_entry_t	*dep;		/* data entry in the block */
	int			i;		/* block entry index */
	int			i8count;	/* count of big-inode entries */
	int			isdot;		/* entry is "." */
	int			isdotdot;	/* entry is ".." */
	xfs_mount_t		*mp;		/* mount structure pointer */
	int			namelen;	/* total name bytes */
	xfs_ino_t		parent = 0;	/* parent inode number */
	int			size=0;		/* total computed size */
	int			has_ftype;
	struct xfs_da_geometry	*geo;

	mp = dp->i_mount;
	geo = mp->m_dir_geo;

	/*
	 * if there is a filetype field, add the extra byte to the namelen
	 * for each entry that we see.
	 */
	has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;

	count = i8count = namelen = 0;
	btp = xfs_dir2_block_tail_p(geo, hdr);
	blp = xfs_dir2_block_leaf_p(btp);

	/*
	 * Iterate over the block's data entries by using the leaf pointers.
	 */
	for (i = 0; i < be32_to_cpu(btp->count); i++) {
		if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
			continue;
		/*
		 * Calculate the pointer to the entry at hand.
		 */
		dep = (xfs_dir2_data_entry_t *)((char *)hdr +
				xfs_dir2_dataptr_to_off(geo, addr));
		/*
		 * Detect . and .., so we can special-case them.
		 * . is not included in sf directories.
		 * .. is included by just the parent inode number.
		 */
		isdot = dep->namelen == 1 && dep->name[0] == '.';
		isdotdot =
			dep->namelen == 2 &&
			dep->name[0] ==