inode.c

在Linux内核从2.4升级到2.6时需要升级的软件包

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will 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 to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
/*
 *   FUNCTION: Display/modify an inode
 */
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "xpeek.h"
#include "jfs_endian.h"
#include "jfs_filsys.h"
#include "jfs_dinode.h"
#include "inode.h"
#include "devices.h"

char *mode_string(mode_t);
int change_inode(struct dinode *);

extern unsigned type_jfs;

void inode()
{
	int64_t address;
	int64_t block_num;
	char cmd_line[80];
	struct dinode inode;
	unsigned inum;
	unsigned offset;
	char *token;
	unsigned which_table = FILESYSTEM_I;

	token = strtok(0, " 	\n");
	if (token == 0) {
		fputs("inode: Please enter: inum [ a | 0 ]\ninode> ", stdout);
		fgets(cmd_line, 80, stdin);
		token = strtok(cmd_line, " 	\n");
		if (token == 0)
			return;
	}
	errno = 0;
	inum = strtoul(token, 0, 0);
	if (inum == 0 && errno) {
		fputs("inode: invalid inum\n\n", stderr);
		return;
	}
	token = strtok(0, " 	\n");
	if (token) {
		if (token[0] == 'a')
			which_table = AGGREGATE_I;
		else if (token[0] == 's')
			which_table = AGGREGATE_2ND_I;
		else if (token[0] != '0') {
			fputs("inode: invalide fileset\n\n", stderr);
			return;
		}
	}
	if (strtok(0, " 	\n")) {
		fputs("inode: Too many arguments\n\n", stderr);
		return;
	}

	if (find_inode(inum, which_table, &address) ||
	    xRead(address, sizeof (struct dinode), (char *) &inode)) {
		fputs("inode: error reading inode\n\n", stderr);
		return;
	}

	/* swap if on big endian machine */
	ujfs_swap_dinode(&inode, GET, type_jfs);

	block_num = address >> l2bsize;
	offset = address & (bsize - 1);

      changed:
	printf("Inode %d at block %lld, offset 0x%x:\n\n", inum, (long long) block_num, offset);
	display_inode(&inode);
	if (change_inode(&inode) == XPEEK_CHANGED) {
		/* swap if on big endian machine */
		ujfs_swap_dinode(&inode, PUT, type_jfs);

		if (xWrite(address, sizeof (struct dinode), (char *) &inode)) {
			fputs("inode: error writing inode\n\n", stderr);
			/* swap back if on big endian machine */
			ujfs_swap_dinode(&inode, GET, type_jfs);
			return;
		}

		/* swap back if on big endian machine */
		ujfs_swap_dinode(&inode, GET, type_jfs);

		goto changed;
	}
	return;
}

/****************************************************************************
 ******	Sample output of dislpay_inode():

Inode 2 at block 402, offset 0x0:

[1] di_inostamp:	0x00000000	[19] di_mtime.tv_nsec:	0x00000000
[2] di_fileset:		16		[20] di_otime.tv_sec:	0x322dea3f
[3] di_number:		2		[21] di_otime.tv_nsec:	0x00000000
[4] di_gen:		1		[22] di_acl.flag:	0x00
[5] di_ixpxd.len:	32		[23] di_acl.rsrvd:	Not Displayed
[6] di_ixpxd.addr1:	0x00		[24] di_acl.size:	0x00000000
[7] di_ixpxd.addr2:	0x00000190	[25] di_acl.len:	0
    di_ixpxd.address:	400		[26] di_acl.addr1:	0x00
[8] di_size:	0x0000000000000100	[27] di_acl.addr2:	0x00000000
[9] di_nblocks:	0x0000000000000000	     di_acl.address:	0
[10] di_nlink:		1		[28] di_ea.flag:	0x00
[11] di_uid:		0		[29] di_ea.rsrvd:	Not Displayed
[12] di_gid:		0		[30] di_ea.size:	0x00000000
[13] di_mode:		0x000141c0	[31] di_ea.len:		0
             0040700	drwx		[32] di_ea.addr1:	0x00
[14] di_atime.tv_sec:	0x322dea3f	[33] di_ea.addr2:	0x00000000
[15] di_atime.tv_nsec:	0x00000000	     di_ea.address:	0
[16] di_ctime.tv_sec:	0x322dea3f	[34] di_next_index:	0
[17] di_ctime.tv_nsec:	0x00000000	[35] di_acltype:	0x00000000
[18] di_mtime.tv_sec:	0x322dea3f

*****************************************************************************/

void display_inode(struct dinode *inode)
{
	printf("[1] di_inostamp:\t0x%08x\t", inode->di_inostamp);
	printf("[19] di_mtime.tv_nsec:\t0x%08x\n", inode->di_mtime.tv_nsec);
	printf("[2] di_fileset:\t\t%d\t\t", inode->di_fileset);
	printf("[20] di_otime.tv_sec:\t0x%08x\n", inode->di_otime.tv_sec);
	printf("[3] di_number:\t\t%d\t\t", inode->di_number);
	printf("[21] di_otime.tv_nsec:\t0x%08x\n", inode->di_otime.tv_nsec);
	printf("[4] di_gen:\t\t%d\t\t", inode->di_gen);
	printf("[22] di_acl.flag:\t0x%02x\n", inode->di_acl.flag);
	printf("[5] di_ixpxd.len:\t%d\t\t", inode->di_ixpxd.len);
	printf("[23] di_acl.rsrvd:\tNot Displayed\n");
	printf("[6] di_ixpxd.addr1:\t0x%02x\t\t", inode->di_ixpxd.addr1);
	printf("[24] di_acl.size:\t0x%08x\n", inode->di_acl.size);
	printf("[7] di_ixpxd.addr2:\t0x%08x\t", inode->di_ixpxd.addr2);
	printf("[25] di_acl.len:\t%d\n", inode->di_acl.len);
	printf("     di_ixpxd.address:\t%lld\t\t", (long long) addressPXD(&(inode->di_ixpxd)));
	printf("[26] di_acl.addr1:\t0x%02x\n", inode->di_acl.addr1);
	printf("[8] di_size:\t0x%016llx\t", (long long) inode->di_size);
	printf("[27] di_acl.addr2:\t0x%08x\n", inode->di_acl.addr2);
	printf("[9] di_nblocks:\t0x%016llx\t", (long long) inode->di_nblocks);
	printf("     di_acl.address:\t%lld\n", (long long) addressDXD(&inode->di_acl));
	printf("[10] di_nlink:\t\t%d\t\t", inode->di_nlink);
	printf("[28] di_ea.flag:\t0x%02x\n", inode->di_ea.flag);
	printf("[11] di_uid:\t\t%d\t\t", inode->di_uid);
	printf("[29] di_ea.rsrvd:\tNot Displayed\n");
	printf("[12] di_gid:\t\t%d\t\t", inode->di_gid);
	printf("[30] di_ea.size:\t0x%08x\n", inode->di_ea.size);
	printf("[13] di_mode:\t\t0x%08x\t", inode->di_mode);
	printf("[31] di_ea.len:\t\t%d\n", inode->di_ea.len);
	printf("\t\t%07o\t%10s\t", inode->di_mode & 0177777, mode_string(inode->di_mode));
	printf("[32] di_ea.addr1:\t0x%02x\n", inode->di_ea.addr1);
	printf("[14] di_atime.tv_sec:\t0x%08x\t", inode->di_atime.tv_sec);
	printf("[33] di_ea.addr2:\t0x%08x\n", inode->di_ea.addr2);
	printf("[15] di_atime.tv_nsec:\t0x%08x\t", inode->di_atime.tv_nsec);
	printf("     di_ea.address:\t%lld\n", (long long) addressDXD(&inode->di_ea));
	printf("[16] di_ctime.tv_sec:\t0x%08x\t", inode->di_ctime.tv_sec);
	printf("[34] di_next_index:\t%d\n", inode->di_next_index);
	printf("[17] di_ctime.tv_nsec:\t0x%08x\t", inode->di_ctime.tv_nsec);
	printf("[35] di_acltype:\t0x%08x\n", inode->di_acltype);
	printf("[18] di_mtime.tv_sec:\t0x%08x\n", inode->di_mtime.tv_sec);
}

int change_inode(struct dinode *inode)
{
	char cmdline[512];
	int field;
	char *token;

      retry:
	fputs("change_inode: [m]odify or e[x]it > ", stdout);
	fgets(cmdline, 512, stdin);
	token = strtok(cmdline, " 	\n");
	if (token == 0 || token[0] != 'm')
		return XPEEK_OK;
	field = m_parse(cmdline, 35, &token);
	if (field == 0)
		goto retry;

	switch (field) {
	case 1:
		inode->di_inostamp = strtoul(token, 0, 16);
		break;
	case 2:
		inode->di_fileset = strtol(token, 0, 0);
		break;
	case 3:
		inode->di_number = strtol(token, 0, 0);
		break;
	case 4:
		inode->di_gen = strtol(token, 0, 0);
		break;
	case 5:
		inode->di_ixpxd.len = strtoul(token, 0, 0);
		break;
	case 6:
		inode->di_ixpxd.addr1 = strtoul(token, 0, 0);
		break;
	case 7:
		inode->di_ixpxd.addr2 = strtoul(token, 0, 0);
		break;
	case 8:
		inode->di_size = strtoull(token, 0, 16);
		break;
	case 9:
		inode->di_nblocks = strtoull(token, 0, 16);
		break;
	case 10:
		inode->di_nlink = strtol(token, 0, 0);
		break;
	case 11:
		inode->di_uid = strtol(token, 0, 0);
		break;
	case 12:
		inode->di_gid = strtol(token, 0, 0);
		break;
	case 13:
		inode->di_mode = strtoul(token, 0, 16);
		break;
	case 14:
		inode->di_atime.tv_sec = strtoul(token, 0, 16);
		break;
	case 15:
		inode->di_atime.tv_nsec = strtoul(token, 0, 16);
		break;
	case 16:
		inode->di_ctime.tv_sec = strtoul(token, 0, 16);
		break;
	case 17:
		inode->di_ctime.tv_nsec = strtoul(token, 0, 16);
		break;
	case 18:
		inode->di_mtime.tv_sec = strtoul(token, 0, 16);
		break;
	case 19:
		inode->di_mtime.tv_nsec = strtoul(token, 0, 16);
		break;
	case 20:
		inode->di_otime.tv_sec = strtoul(token, 0, 16);
		break;
	case 21:
		inode->di_otime.tv_nsec = strtoul(token, 0, 16);
		break;
	case 22:
		inode->di_acl.flag = strtol(token, 0, 16);
		break;
	case 23:
	case 29:
		fputs("change_inode: Can't change this field\n", stderr);
		goto retry;
	case 24:
		inode->di_acl.size = strtol(token, 0, 16);
		break;
	case 25:
		inode->di_acl.len = strtol(token, 0, 0);
		break;
	case 26:
		inode->di_acl.addr1 = strtol(token, 0, 16);
		break;
	case 27:
		inode->di_acl.addr2 = strtol(token, 0, 16);
		break;
	case 28:
		inode->di_ea.flag = strtol(token, 0, 16);
		break;
	case 30:
		inode->di_ea.size = strtol(token, 0, 16);
		break;
	case 31:
		inode->di_ea.len = strtol(token, 0, 0);
		break;
	case 32:
		inode->di_ea.addr1 = strtol(token, 0, 16);
		break;
	case 33:
		inode->di_ea.addr2 = strtol(token, 0, 16);
		break;
	case 34:
		inode->di_next_index = strtol(token, 0, 0);
		break;
	case 35:
		inode->di_acltype = strtol(token, 0, 16);
		break;
	}
	return XPEEK_CHANGED;
}

char *mode_string(mode_t mode)
{
	int type;
	static char mode_str[5];

	strcpy(mode_str, "----");

	type = mode & IFMT;
	switch (type) {
	case IFREG:
		break;
	case IFDIR:
		mode_str[0] = 'd';
		break;
	case IFLNK:
		mode_str[0] = 'l';
		break;
	case IFCHR:
		mode_str[0] = 'c';
		break;
	case IFBLK:
		mode_str[0] = 'b';
		break;
	case IFFIFO:
		mode_str[0] = 'p';
		break;
	case IFSOCK:
		mode_str[0] = 's';
		break;
	default:
		mode_str[0] = '?';
		break;
	}
	if (mode & IREAD)
		mode_str[1] = 'r';
	if (mode & IWRITE)
		mode_str[2] = 'w';
	if (mode & IEXEC) {
		if (mode & ISUID & ISGID)
			mode_str[3] = 's';
		else if (mode & ISUID)
			mode_str[3] = 'u';
		else if (mode & ISGID)
			mode_str[3] = 'g';
		else
			mode_str[3] = 'x';
	} else {
		if (mode & ISUID & ISGID)
			mode_str[3] = 'S';
		else if (mode & ISUID)
			mode_str[3] = 'U';
		else if (mode & ISGID)
			mode_str[3] = 'G';
	}
	return mode_str;
}

int find_inode(unsigned inum, unsigned which_table, int64_t * address)
{
	int extnum;
	struct iag iag;
	int iagnum;
	int64_t map_address;
	int rc;

	iagnum = INOTOIAG(inum);
	extnum = (inum & (INOSPERIAG - 1)) >> L2INOSPEREXT;
	if (find_iag(iagnum, which_table, &map_address) == 1)
		return 1;

	rc = ujfs_rw_diskblocks(fp, map_address, sizeof (struct iag), &iag, GET);
	if (rc) {
		fputs("find_inode: Error reading iag\n", stderr);
		return 1;
	}

	/* swap if on big endian machine */
	ujfs_swap_iag(&iag);

	if (iag.inoext[extnum].len == 0)
		return 1;

	*address = (addressPXD(&iag.inoext[extnum]) << l2bsize) +
	    ((inum & (INOSPEREXT - 1)) * sizeof (struct dinode));
	return 0;
}