1997-04-26 17:21:57 +04:00
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/*
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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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1997-04-26 17:58:21 +04:00
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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1997-04-26 17:21:57 +04:00
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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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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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:34:30 +04:00
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scan->magic = EXT2_ET_MAGIC_INODE_SCAN;
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1997-04-26 17:21:57 +04:00
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scan->fs = fs;
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1997-04-26 18:48:50 +04:00
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scan->inode_size = EXT2_INODE_SIZE(fs->super);
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scan->bytes_left = 0;
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:34:30 +04:00
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scan->done_group = 0;
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scan->done_group_data = 0;
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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scan->temp_buffer = malloc(scan->inode_size);
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if (!scan->temp_buffer) {
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free(scan->inode_buffer);
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free(scan);
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return ENOMEM;
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}
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:34:30 +04:00
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if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
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return;
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1997-04-26 17:21:57 +04:00
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free(scan->inode_buffer);
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scan->inode_buffer = NULL;
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1997-04-26 18:48:50 +04:00
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free(scan->temp_buffer);
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scan->temp_buffer = NULL;
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1997-04-26 17:21:57 +04:00
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free(scan);
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return;
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}
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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int extra_bytes = 0;
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1997-04-26 17:21:57 +04:00
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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN);
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1997-04-26 18:48:50 +04:00
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/*
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* Do we need to start reading a new block group?
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*/
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1997-04-26 17:21:57 +04:00
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if (scan->inodes_left <= 0) {
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1997-04-26 18:48:50 +04:00
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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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if (scan->groups_left <= 0) {
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*ino = 0;
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return 0;
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 18:48:50 +04:00
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scan->current_group++;
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scan->groups_left--;
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scan->current_block = scan->fs->
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group_desc[scan->current_group].bg_inode_table;
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if (scan->current_block == 0)
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return EXT2_ET_MISSING_INODE_TABLE;
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scan->bytes_left = 0;
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scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
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scan->blocks_left = scan->fs->inode_blocks_per_group;
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}
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/*
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* Have we run out of space in the inode buffer? If so, we
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* need to read in more blocks.
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*/
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if (scan->bytes_left < scan->inode_size) {
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memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left);
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extra_bytes = scan->bytes_left;
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1997-04-26 17:21:57 +04:00
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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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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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1997-04-26 18:48:50 +04:00
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scan->ptr = scan->inode_buffer;
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scan->bytes_left = num_blocks * scan->fs->blocksize;
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scan->current_block += scan->inode_buffer_blocks;
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}
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if (extra_bytes) {
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memcpy(scan->temp_buffer+extra_bytes, scan->ptr,
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scan->inode_size - extra_bytes);
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scan->ptr += scan->inode_size - extra_bytes;
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scan->bytes_left -= scan->inode_size - extra_bytes;
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1997-04-29 18:53:37 +04:00
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if ((scan->fs->flags & EXT2_SWAP_BYTES) ||
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(scan->fs->flags & EXT2_SWAP_BYTES_READ))
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ext2fs_swap_inode(scan->fs, inode,
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(struct ext2_inode *) scan->temp_buffer, 0);
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1997-04-26 18:48:50 +04:00
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else
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*inode = *((struct ext2_inode *) scan->temp_buffer);
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} else {
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1997-04-29 18:53:37 +04:00
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if ((scan->fs->flags & EXT2_SWAP_BYTES) ||
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(scan->fs->flags & EXT2_SWAP_BYTES_READ))
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ext2fs_swap_inode(scan->fs, inode,
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(struct ext2_inode *) scan->ptr, 0);
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1997-04-26 18:48:50 +04:00
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else
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*inode = *((struct ext2_inode *) scan->ptr);
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scan->ptr += scan->inode_size;
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scan->bytes_left -= scan->inode_size;
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:58:21 +04:00
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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static blk_t inode_buffer_block = 0;
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1997-04-26 17:21:57 +04:00
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static int inode_buffer_size = 0;
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1997-04-29 18:53:37 +04:00
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#define INODE_CACHE_SIZE 4
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#ifdef INODE_CACHE_SIZE
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static int cache_last = -1;
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static struct {
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ino_t inode;
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struct ext2_inode value;
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} inode_cache[INODE_CACHE_SIZE];
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#endif
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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unsigned long group, block, block_nr, offset;
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char *ptr;
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1997-04-26 17:21:57 +04:00
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errcode_t retval;
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1997-04-29 18:53:37 +04:00
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int clen, length, i;
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1997-04-26 17:21:57 +04:00
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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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1997-04-29 18:53:37 +04:00
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/* Check to see if user has an override function */
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if (fs->read_inode) {
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retval = (fs->read_inode)(fs, ino, inode);
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if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
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return retval;
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}
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/* Check to see if it's in the inode cache */
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#ifdef INODE_CACHE_SIZE
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if (cache_last == -1) {
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for (i=0; i < INODE_CACHE_SIZE; i++)
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inode_cache[i].inode = 0;
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cache_last = INODE_CACHE_SIZE-1;
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} else for (i=0; i < INODE_CACHE_SIZE; i++) {
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if (inode_cache[i].inode == ino) {
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*inode = inode_cache[i].value;
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return 0;
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}
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}
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#endif
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
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EXT2_INODE_SIZE(fs->super);
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block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
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ptr = ((char *) inode_buffer) + offset;
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memset(inode, 0, sizeof(struct ext2_inode));
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length = EXT2_INODE_SIZE(fs->super);
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if (length > sizeof(struct ext2_inode))
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length = sizeof(struct ext2_inode);
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if ((offset + length) > EXT2_BLOCK_SIZE(fs->super)) {
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clen = EXT2_BLOCK_SIZE(fs->super) - offset;
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memcpy((char *) inode, ptr, clen);
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length -= clen;
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retval = io_channel_read_blk(fs->io, block_nr+1, 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+1;
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memcpy(((char *) inode) + clen,
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inode_buffer, length);
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} else
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memcpy((char *) inode, ptr, length);
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1997-04-29 18:53:37 +04:00
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if ((fs->flags & EXT2_SWAP_BYTES) ||
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(fs->flags & EXT2_SWAP_BYTES_READ))
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ext2fs_swap_inode(fs, inode, inode, 0);
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/* Update the inode cache */
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#ifdef INODE_CACHE_SIZE
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cache_last = (cache_last + 1) % INODE_CACHE_SIZE;
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inode_cache[cache_last].inode = ino;
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inode_cache[cache_last].value = *inode;
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#endif
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1997-04-26 18:48:50 +04:00
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:48:50 +04:00
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unsigned long group, block, block_nr, offset;
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1997-04-26 17:21:57 +04:00
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errcode_t retval;
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1997-04-26 18:48:50 +04:00
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struct ext2_inode temp_inode;
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char *ptr;
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1997-04-29 18:53:37 +04:00
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int clen, length, i;
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1997-04-26 17:21:57 +04:00
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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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1997-04-29 18:53:37 +04:00
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/* Check to see if user provided an override function */
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if (fs->write_inode) {
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retval = (fs->write_inode)(fs, ino, inode);
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if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
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return retval;
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}
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/* Check to see if the inode cache needs to be updated */
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#ifdef INODE_CACHE_SIZE
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for (i=0; i < INODE_CACHE_SIZE; i++) {
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if (inode_cache[i].inode == ino) {
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inode_cache[i].value = *inode;
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break;
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}
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}
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#endif
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1997-04-26 17:21:57 +04:00
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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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}
|
1997-04-29 18:53:37 +04:00
|
|
|
if ((fs->flags & EXT2_SWAP_BYTES) ||
|
|
|
|
(fs->flags & EXT2_SWAP_BYTES_WRITE))
|
|
|
|
ext2fs_swap_inode(fs, &temp_inode, inode, 1);
|
1997-04-26 18:48:50 +04:00
|
|
|
else
|
|
|
|
memcpy(&temp_inode, inode, sizeof(struct ext2_inode));
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
|
1997-04-26 18:48:50 +04:00
|
|
|
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
|
|
|
|
EXT2_INODE_SIZE(fs->super);
|
|
|
|
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
|
1997-04-26 17:21:57 +04:00
|
|
|
block_nr = fs->group_desc[group].bg_inode_table + block;
|
1997-04-26 18:48:50 +04:00
|
|
|
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
|
|
|
|
ptr = (char *) inode_buffer + offset;
|
|
|
|
|
|
|
|
length = EXT2_INODE_SIZE(fs->super);
|
|
|
|
if (length > sizeof(struct ext2_inode))
|
|
|
|
length = sizeof(struct ext2_inode);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (inode_buffer_block != block_nr) {
|
|
|
|
retval = io_channel_read_blk(fs->io, block_nr, 1,
|
|
|
|
inode_buffer);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
inode_buffer_block = block_nr;
|
|
|
|
}
|
1997-04-26 18:48:50 +04:00
|
|
|
|
|
|
|
if ((offset + length) > EXT2_BLOCK_SIZE(fs->super)) {
|
|
|
|
clen = EXT2_BLOCK_SIZE(fs->super) - offset;
|
|
|
|
memcpy(ptr, &temp_inode, clen);
|
|
|
|
length -= clen;
|
|
|
|
} else {
|
|
|
|
memcpy(ptr, &temp_inode, length);
|
|
|
|
length = 0;
|
|
|
|
}
|
1997-04-26 17:21:57 +04:00
|
|
|
retval = io_channel_write_blk(fs->io, block_nr, 1, inode_buffer);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-04-26 18:48:50 +04:00
|
|
|
|
|
|
|
if (length) {
|
|
|
|
retval = io_channel_read_blk(fs->io, ++block_nr, 1,
|
|
|
|
inode_buffer);
|
|
|
|
if (retval) {
|
|
|
|
inode_buffer_block = 0;
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
inode_buffer_block = block_nr;
|
|
|
|
memcpy(inode_buffer, ((char *) &temp_inode) + clen, length);
|
|
|
|
|
|
|
|
retval = io_channel_write_blk(fs->io, block_nr, 1,
|
|
|
|
inode_buffer);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
fs->flags |= EXT2_FLAG_CHANGED;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
errcode_t ext2fs_get_blocks(ext2_filsys fs, ino_t ino, blk_t *blocks)
|
|
|
|
{
|
|
|
|
struct ext2_inode inode;
|
|
|
|
int i;
|
|
|
|
errcode_t retval;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (ino > fs->super->s_inodes_count)
|
|
|
|
return EXT2_ET_BAD_INODE_NUM;
|
|
|
|
|
|
|
|
if (fs->get_blocks) {
|
|
|
|
if (!(*fs->get_blocks)(fs, ino, blocks))
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
retval = ext2fs_read_inode(fs, ino, &inode);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
for (i=0; i < EXT2_N_BLOCKS; i++)
|
|
|
|
blocks[i] = inode.i_block[i];
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
errcode_t ext2fs_check_directory(ext2_filsys fs, ino_t ino)
|
|
|
|
{
|
|
|
|
struct ext2_inode inode;
|
|
|
|
errcode_t retval;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (ino > fs->super->s_inodes_count)
|
|
|
|
return EXT2_ET_BAD_INODE_NUM;
|
|
|
|
|
|
|
|
if (fs->check_directory)
|
|
|
|
return (fs->check_directory)(fs, ino);
|
|
|
|
retval = ext2fs_read_inode(fs, ino, &inode);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-04-26 17:58:21 +04:00
|
|
|
if (!LINUX_S_ISDIR(inode.i_mode))
|
1997-04-29 18:53:37 +04:00
|
|
|
return ENOTDIR;
|
1997-04-26 17:21:57 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|