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Consolidate btree block handling for xfs_db

Currently xfs_db has five different implementations for poking at btree
blocks, even duplicating code for btree blocks with entirely identical
layout (bmapbta vs bmapbtd and bno vs cnt).  Merge all these into
a single implementation that uses a table of btree characteristics keyed
of their magic number.

There's probably a way to further consolidate the magic arrays for the
different types, but I don't quite understand xfs_db's table driven
command parser for that.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of master-melb:xfs-cmds:32248a by kenmcd.

  Consolidate btree block handling for xfs_db

/*
 * Copyright (c) 2000-2001,2005 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/libxfs.h>
#include "block.h"
#include "command.h"
#include "type.h"
#include "faddr.h"
#include "fprint.h"
#include "field.h"
#include "print.h"
#include "sb.h"
#include "inode.h"
#include "btblock.h"
#include "bmroot.h"
#include "agf.h"
#include "agfl.h"
#include "agi.h"
#include "dir.h"
#include "dirshort.h"
#include "io.h"
#include "output.h"
#include "write.h"
#include "attr.h"
#include "dquot.h"
#include "dir2.h"
#include "text.h"

static const typ_t	*findtyp(char *name);
static int		type_f(int argc, char **argv);

const typ_t	*cur_typ;

static const cmdinfo_t	type_cmd =
	{ "type", NULL, type_f, 0, 1, 1, "[newtype]",
	  "set/show current data type", NULL };

const typ_t	typtab[] = {
	{ TYP_AGF, "agf", handle_struct, agf_hfld },
	{ TYP_AGFL, "agfl", handle_struct, agfl_hfld },
	{ TYP_AGI, "agi", handle_struct, agi_hfld },
	{ TYP_ATTR, "attr", handle_struct, attr_hfld },
	{ TYP_BMAPBTA, "bmapbta", handle_struct, bmapbta_hfld },
	{ TYP_BMAPBTD, "bmapbtd", handle_struct, bmapbtd_hfld },
	{ TYP_BNOBT, "bnobt", handle_struct, bnobt_hfld },
	{ TYP_CNTBT, "cntbt", handle_struct, cntbt_hfld },
	{ TYP_DATA, "data", handle_block, NULL },
	{ TYP_DIR, "dir", handle_struct, dir_hfld },
	{ TYP_DIR2, "dir2", handle_struct, dir2_hfld },
	{ TYP_DQBLK, "dqblk", handle_struct, dqblk_hfld },
	{ TYP_INOBT, "inobt", handle_struct, inobt_hfld },
	{ TYP_INODATA, "inodata", NULL, NULL },
	{ TYP_INODE, "inode", handle_struct, inode_hfld },
	{ TYP_LOG, "log", NULL, NULL },
	{ TYP_RTBITMAP, "rtbitmap", NULL, NULL },
	{ TYP_RTSUMMARY, "rtsummary", NULL, NULL },
	{ TYP_SB, "sb", handle_struct, sb_hfld },
	{ TYP_SYMLINK, "symlink", handle_string, NULL },
	{ TYP_TEXT, "text", handle_text, NULL },
	{ TYP_NONE, NULL }
};

static const typ_t *
findtyp(
	char		*name)
{
	const typ_t	*tt;

	for (tt = typtab; tt->name != NULL; tt++) {
		ASSERT(tt->typnm == (typnm_t)(tt - typtab));
		if (strcmp(tt->name, name) == 0)
			return tt;
	}
	return NULL;
}

static int
type_f(
	int		argc,
	char		**argv)
{
	const typ_t	*tt;
	int count = 0;

	if (argc == 1) {
		if (cur_typ == NULL)
			dbprintf("no current type\n");
		else
			dbprintf("current type is \"%s\"\n", cur_typ->name);

		dbprintf("\n supported types are:\n ");
		for (tt = typtab, count = 0; tt->name != NULL; tt++) {
			if ((tt+1)->name != NULL) {
				dbprintf("%s, ", tt->name);
				if ((++count % 8) == 0)
					dbprintf("\n ");
			} else {
				dbprintf("%s\n", tt->name);
			}
		}


	} else {
		tt = findtyp(argv[1]);
		if (tt == NULL) {
			dbprintf("no such type %s\n", argv[1]);
		} else {
			if (iocur_top->typ == NULL) {
			    dbprintf("no current object\n");
			} else {
			    iocur_top->typ = cur_typ = tt;
			}
		}
	}
	return 0;
}

void
type_init(void)
{
	add_command(&type_cmd);
}

/* read/write selectors for each major data type */

void
handle_struct(
	int           action,
	const field_t *fields,
	int           argc,
	char          **argv)
{
	if (action == DB_WRITE)
		write_struct(fields, argc, argv);
	else
		print_struct(fields, argc, argv);
}

void
handle_string(
	int           action,
	const field_t *fields,
	int           argc,
	char          **argv)
{
	if (action == DB_WRITE)
		write_string(fields, argc, argv);
	else
		print_string(fields, argc, argv);
}

void
handle_block(
	int           action,
	const field_t *fields,
	int           argc,
	char          **argv)
{
	if (action == DB_WRITE)
		write_block(fields, argc, argv);
	else
		print_block(fields, argc, argv);
}

void
handle_text(
	int           action,
	const field_t *fields,
	int           argc,
	char          **argv)
{
	if (action != DB_WRITE)
		print_text(fields, argc, argv);
}