mirror of https://github.com/vitalif/e2fsprogs
311 lines
8.0 KiB
C
311 lines
8.0 KiB
C
/*
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* inode.c --- utility routines to read and write inodes
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*
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* Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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static void inocpy_with_swap(struct ext2_inode *t, struct ext2_inode *f);
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errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
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ext2_inode_scan *ret_scan)
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{
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ext2_inode_scan scan;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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scan = (ext2_inode_scan) malloc(sizeof(struct ext2_struct_inode_scan));
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if (!scan)
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return ENOMEM;
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memset(scan, 0, sizeof(struct ext2_struct_inode_scan));
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scan->magic = EXT2_ET_MAGIC_INODE_SCAN;
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scan->fs = fs;
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scan->current_group = -1;
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scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8;
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scan->groups_left = fs->group_desc_count;
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scan->inode_buffer = malloc(scan->inode_buffer_blocks * fs->blocksize);
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scan->done_group = 0;
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scan->done_group_data = 0;
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if (!scan->inode_buffer) {
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free(scan);
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return ENOMEM;
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}
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*ret_scan = scan;
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return 0;
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}
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void ext2fs_close_inode_scan(ext2_inode_scan scan)
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{
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if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
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return;
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free(scan->inode_buffer);
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scan->inode_buffer = NULL;
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free(scan);
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return;
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}
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void ext2fs_set_inode_callback(ext2_inode_scan scan,
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errcode_t (*done_group)(ext2_filsys fs,
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ext2_inode_scan scan,
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dgrp_t group,
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void * private),
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void *done_group_data)
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{
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if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
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return;
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scan->done_group = done_group;
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scan->done_group_data = done_group_data;
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}
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errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ino_t *ino,
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struct ext2_inode *inode)
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{
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errcode_t retval;
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int num_blocks;
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EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN);
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if (scan->inodes_left <= 0) {
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if (scan->blocks_left <= 0) {
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if (scan->done_group) {
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retval = (scan->done_group)
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(scan->fs, scan,
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scan->current_group,
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scan->done_group_data);
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if (retval)
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return retval;
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}
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do {
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if (scan->groups_left <= 0) {
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*ino = 0;
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return 0;
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}
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scan->current_group++;
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scan->groups_left--;
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scan->current_block =
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scan->fs->group_desc[scan->current_group].bg_inode_table;
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scan->blocks_left = (EXT2_INODES_PER_GROUP(scan->fs->super) /
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EXT2_INODES_PER_BLOCK(scan->fs->super));
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} while (scan->current_block == 0);
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} else {
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scan->current_block += scan->inode_buffer_blocks;
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}
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scan->blocks_left -= scan->inode_buffer_blocks;
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num_blocks = scan->inode_buffer_blocks;
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if (scan->blocks_left < 0)
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num_blocks += scan->blocks_left;
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scan->inodes_left = EXT2_INODES_PER_BLOCK(scan->fs->super) *
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num_blocks;
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retval = io_channel_read_blk(scan->fs->io, scan->current_block,
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num_blocks, scan->inode_buffer);
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if (retval)
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return EXT2_ET_NEXT_INODE_READ;
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scan->inode_scan_ptr = (struct ext2_inode *) scan->inode_buffer;
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}
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if (scan->fs->flags & EXT2_SWAP_BYTES)
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inocpy_with_swap(inode, scan->inode_scan_ptr++);
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else
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*inode = *scan->inode_scan_ptr++;
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scan->inodes_left--;
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scan->current_inode++;
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*ino = scan->current_inode;
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return 0;
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}
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/*
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* Functions to read and write a single inode.
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*/
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static char *inode_buffer = 0;
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static blk_t inode_buffer_block;
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static int inode_buffer_size = 0;
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errcode_t ext2fs_read_inode (ext2_filsys fs, unsigned long ino,
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struct ext2_inode * inode)
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{
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unsigned long group;
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unsigned long block;
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unsigned long block_nr;
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errcode_t retval;
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int i;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (ino > fs->super->s_inodes_count)
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return EXT2_ET_BAD_INODE_NUM;
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if (inode_buffer_size != fs->blocksize) {
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if (inode_buffer)
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free(inode_buffer);
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inode_buffer_size = 0;
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inode_buffer = malloc(fs->blocksize);
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if (!inode_buffer)
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return ENOMEM;
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inode_buffer_size = fs->blocksize;
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inode_buffer_block = 0;
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}
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group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
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block = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) /
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EXT2_INODES_PER_BLOCK(fs->super);
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i = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) %
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EXT2_INODES_PER_BLOCK(fs->super);
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block_nr = fs->group_desc[group].bg_inode_table + block;
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if (block_nr != inode_buffer_block) {
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retval = io_channel_read_blk(fs->io, block_nr, 1,
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inode_buffer);
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if (retval)
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return retval;
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inode_buffer_block = block_nr;
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}
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if (fs->flags & EXT2_SWAP_BYTES)
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inocpy_with_swap(inode,
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(struct ext2_inode *) inode_buffer + i);
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else
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memcpy (inode, (struct ext2_inode *) inode_buffer + i,
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sizeof (struct ext2_inode));
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return 0;
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}
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errcode_t ext2fs_write_inode(ext2_filsys fs, unsigned long ino,
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struct ext2_inode * inode)
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{
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unsigned long group;
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unsigned long block;
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unsigned long block_nr;
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errcode_t retval;
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int i;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!(fs->flags & EXT2_FLAG_RW))
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return EXT2_ET_RO_FILSYS;
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if (ino > fs->super->s_inodes_count)
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return EXT2_ET_BAD_INODE_NUM;
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if (inode_buffer_size != fs->blocksize) {
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if (inode_buffer)
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free(inode_buffer);
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inode_buffer_size = 0;
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inode_buffer = malloc(fs->blocksize);
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if (!inode_buffer)
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return ENOMEM;
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inode_buffer_size = fs->blocksize;
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inode_buffer_block = 0;
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}
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group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
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block = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) /
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EXT2_INODES_PER_BLOCK(fs->super);
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i = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) %
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EXT2_INODES_PER_BLOCK(fs->super);
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block_nr = fs->group_desc[group].bg_inode_table + block;
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if (inode_buffer_block != block_nr) {
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retval = io_channel_read_blk(fs->io, block_nr, 1,
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inode_buffer);
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if (retval)
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return retval;
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inode_buffer_block = block_nr;
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}
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if (fs->flags & EXT2_SWAP_BYTES)
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inocpy_with_swap((struct ext2_inode *) inode_buffer + i,
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inode);
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else
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memcpy ((struct ext2_inode *) inode_buffer + i, inode,
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sizeof (struct ext2_inode));
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retval = io_channel_write_blk(fs->io, block_nr, 1, inode_buffer);
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if (retval)
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return retval;
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fs->flags |= EXT2_FLAG_CHANGED;
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return 0;
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}
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errcode_t ext2fs_get_blocks(ext2_filsys fs, ino_t ino, blk_t *blocks)
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{
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struct ext2_inode inode;
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int i;
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errcode_t retval;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (ino > fs->super->s_inodes_count)
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return EXT2_ET_BAD_INODE_NUM;
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if (fs->get_blocks) {
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if (!(*fs->get_blocks)(fs, ino, blocks))
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return 0;
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}
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval)
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return retval;
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for (i=0; i < EXT2_N_BLOCKS; i++)
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blocks[i] = inode.i_block[i];
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return 0;
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}
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errcode_t ext2fs_check_directory(ext2_filsys fs, ino_t ino)
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{
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struct ext2_inode inode;
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errcode_t retval;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (ino > fs->super->s_inodes_count)
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return EXT2_ET_BAD_INODE_NUM;
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if (fs->check_directory)
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return (fs->check_directory)(fs, ino);
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval)
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return retval;
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if (!LINUX_S_ISDIR(inode.i_mode))
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return ENOTDIR;
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return 0;
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}
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static void inocpy_with_swap(struct ext2_inode *t, struct ext2_inode *f)
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{
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unsigned i;
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t->i_mode = ext2fs_swab16(f->i_mode);
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t->i_uid = ext2fs_swab16(f->i_uid);
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t->i_size = ext2fs_swab32(f->i_size);
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t->i_atime = ext2fs_swab32(f->i_atime);
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t->i_ctime = ext2fs_swab32(f->i_ctime);
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t->i_mtime = ext2fs_swab32(f->i_mtime);
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t->i_dtime = ext2fs_swab32(f->i_dtime);
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t->i_gid = ext2fs_swab16(f->i_gid);
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t->i_links_count = ext2fs_swab16(f->i_links_count);
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t->i_blocks = ext2fs_swab32(f->i_blocks);
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t->i_flags = ext2fs_swab32(f->i_flags);
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for (i = 0; i < EXT2_N_BLOCKS; i++)
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t->i_block[i] = ext2fs_swab32(f->i_block[i]);
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t->i_version = ext2fs_swab32(f->i_version);
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t->i_file_acl = ext2fs_swab32(f->i_file_acl);
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t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
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t->i_faddr = ext2fs_swab32(f->i_faddr);
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t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
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t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
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t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
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}
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