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768 lines
19 KiB
C
768 lines
19 KiB
C
/* vi: set sw=4 ts=4: */
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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, 1994, 1995, 1996, 1997 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fsP.h"
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#include "e2image.h"
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struct ext2_struct_inode_scan {
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errcode_t magic;
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ext2_filsys fs;
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ext2_ino_t current_inode;
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blk_t current_block;
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dgrp_t current_group;
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ext2_ino_t inodes_left;
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blk_t blocks_left;
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dgrp_t groups_left;
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blk_t inode_buffer_blocks;
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char * inode_buffer;
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int inode_size;
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char * ptr;
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int bytes_left;
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char *temp_buffer;
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errcode_t (*done_group)(ext2_filsys fs,
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dgrp_t group,
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void * priv_data);
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void * done_group_data;
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int bad_block_ptr;
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int scan_flags;
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int reserved[6];
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};
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/*
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* This routine flushes the icache, if it exists.
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*/
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errcode_t ext2fs_flush_icache(ext2_filsys fs)
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{
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int i;
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if (!fs->icache)
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return 0;
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for (i=0; i < fs->icache->cache_size; i++)
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fs->icache->cache[i].ino = 0;
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fs->icache->buffer_blk = 0;
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return 0;
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}
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static errcode_t create_icache(ext2_filsys fs)
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{
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errcode_t retval;
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if (fs->icache)
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return 0;
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retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache);
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if (retval)
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return retval;
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memset(fs->icache, 0, sizeof(struct ext2_inode_cache));
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retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer);
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if (retval) {
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ext2fs_free_mem(&fs->icache);
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return retval;
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}
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fs->icache->buffer_blk = 0;
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fs->icache->cache_last = -1;
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fs->icache->cache_size = 4;
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fs->icache->refcount = 1;
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retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache_ent)
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* fs->icache->cache_size,
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&fs->icache->cache);
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if (retval) {
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ext2fs_free_mem(&fs->icache->buffer);
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ext2fs_free_mem(&fs->icache);
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return retval;
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}
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ext2fs_flush_icache(fs);
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return 0;
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}
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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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errcode_t retval;
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errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks);
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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/*
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* If fs->badblocks isn't set, then set it --- since the inode
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* scanning functions require it.
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*/
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if (fs->badblocks == 0) {
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/*
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* Temporarly save fs->get_blocks and set it to zero,
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* for compatibility with old e2fsck's.
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*/
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save_get_blocks = fs->get_blocks;
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fs->get_blocks = 0;
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retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
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if (retval) {
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ext2fs_badblocks_list_free(fs->badblocks);
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fs->badblocks = 0;
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}
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fs->get_blocks = save_get_blocks;
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}
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retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan);
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if (retval)
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return retval;
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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->inode_size = EXT2_INODE_SIZE(fs->super);
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scan->bytes_left = 0;
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scan->current_group = 0;
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scan->groups_left = fs->group_desc_count - 1;
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scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8;
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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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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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retval = ext2fs_get_mem((size_t) (scan->inode_buffer_blocks *
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fs->blocksize),
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&scan->inode_buffer);
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scan->done_group = 0;
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scan->done_group_data = 0;
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scan->bad_block_ptr = 0;
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if (retval) {
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ext2fs_free_mem(&scan);
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return retval;
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}
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retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer);
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if (retval) {
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ext2fs_free_mem(&scan->inode_buffer);
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ext2fs_free_mem(&scan);
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return retval;
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}
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if (scan->fs->badblocks && scan->fs->badblocks->num)
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scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS;
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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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ext2fs_free_mem(&scan->inode_buffer);
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scan->inode_buffer = NULL;
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ext2fs_free_mem(&scan->temp_buffer);
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scan->temp_buffer = NULL;
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ext2fs_free_mem(&scan);
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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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dgrp_t group,
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void * priv_data),
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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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int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags,
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int clear_flags)
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{
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int old_flags;
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if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
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return 0;
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old_flags = scan->scan_flags;
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scan->scan_flags &= ~clear_flags;
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scan->scan_flags |= set_flags;
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return old_flags;
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}
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/*
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* This function is called by ext2fs_get_next_inode when it needs to
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* get ready to read in a new blockgroup.
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*/
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static errcode_t get_next_blockgroup(ext2_inode_scan scan)
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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 = scan->fs->
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group_desc[scan->current_group].bg_inode_table;
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scan->current_inode = scan->current_group *
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EXT2_INODES_PER_GROUP(scan->fs->super);
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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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return 0;
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}
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errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan,
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int group)
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{
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scan->current_group = group - 1;
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scan->groups_left = scan->fs->group_desc_count - group;
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return get_next_blockgroup(scan);
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}
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/*
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* This function is called by get_next_blocks() to check for bad
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* blocks in the inode table.
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*
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* This function assumes that badblocks_list->list is sorted in
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* increasing order.
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*/
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static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
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blk_t *num_blocks)
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{
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blk_t blk = scan->current_block;
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badblocks_list bb = scan->fs->badblocks;
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/*
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* If the inode table is missing, then obviously there are no
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* bad blocks. :-)
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*/
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if (blk == 0)
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return 0;
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/*
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* If the current block is greater than the bad block listed
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* in the bad block list, then advance the pointer until this
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* is no longer the case. If we run out of bad blocks, then
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* we don't need to do any more checking!
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*/
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while (blk > bb->list[scan->bad_block_ptr]) {
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if (++scan->bad_block_ptr >= bb->num) {
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scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
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return 0;
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}
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}
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/*
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* If the current block is equal to the bad block listed in
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* the bad block list, then handle that one block specially.
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* (We could try to handle runs of bad blocks, but that
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* only increases CPU efficiency by a small amount, at the
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* expense of a huge expense of code complexity, and for an
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* uncommon case at that.)
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*/
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if (blk == bb->list[scan->bad_block_ptr]) {
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scan->scan_flags |= EXT2_SF_BAD_INODE_BLK;
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*num_blocks = 1;
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if (++scan->bad_block_ptr >= bb->num)
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scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
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return 0;
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}
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/*
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* If there is a bad block in the range that we're about to
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* read in, adjust the number of blocks to read so that we we
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* don't read in the bad block. (Then the next block to read
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* will be the bad block, which is handled in the above case.)
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*/
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if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr])
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*num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk);
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return 0;
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}
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/*
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* This function is called by ext2fs_get_next_inode when it needs to
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* read in more blocks from the current blockgroup's inode table.
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*/
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static errcode_t get_next_blocks(ext2_inode_scan scan)
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{
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blk_t num_blocks;
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errcode_t retval;
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/*
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* Figure out how many blocks to read; we read at most
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* inode_buffer_blocks, and perhaps less if there aren't that
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* many blocks left to read.
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*/
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num_blocks = scan->inode_buffer_blocks;
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if (num_blocks > scan->blocks_left)
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num_blocks = scan->blocks_left;
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/*
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* If the past block "read" was a bad block, then mark the
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* left-over extra bytes as also being bad.
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*/
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if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) {
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if (scan->bytes_left)
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scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES;
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scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK;
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}
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/*
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* Do inode bad block processing, if necessary.
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*/
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if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) {
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retval = check_for_inode_bad_blocks(scan, &num_blocks);
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if (retval)
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return retval;
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}
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if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) ||
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(scan->current_block == 0)) {
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memset(scan->inode_buffer, 0,
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(size_t) num_blocks * scan->fs->blocksize);
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} else {
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retval = io_channel_read_blk(scan->fs->io,
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scan->current_block,
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(int) num_blocks,
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scan->inode_buffer);
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if (retval)
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return EXT2_ET_NEXT_INODE_READ;
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}
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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->blocks_left -= num_blocks;
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if (scan->current_block)
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scan->current_block += num_blocks;
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return 0;
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}
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errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino,
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struct ext2_inode *inode, int bufsize)
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{
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errcode_t retval;
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int extra_bytes = 0;
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EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN);
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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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if (scan->inodes_left <= 0) {
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force_new_group:
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if (scan->done_group) {
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retval = (scan->done_group)
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(scan->fs, 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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}
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retval = get_next_blockgroup(scan);
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if (retval)
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return retval;
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}
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/*
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* This is done outside the above if statement so that the
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* check can be done for block group #0.
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*/
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if (scan->current_block == 0) {
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if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) {
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goto force_new_group;
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} else
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return EXT2_ET_MISSING_INODE_TABLE;
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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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retval = get_next_blocks(scan);
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if (retval)
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return retval;
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#if 0
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/*
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* XXX test Need check for used inode somehow.
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* (Note: this is hard.)
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*/
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if (is_empty_scan(scan))
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goto force_new_group;
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#endif
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}
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retval = 0;
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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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#if BB_BIG_ENDIAN
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if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
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ext2fs_swap_inode_full(scan->fs,
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(struct ext2_inode_large *) inode,
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(struct ext2_inode_large *) scan->temp_buffer,
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0, bufsize);
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else
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#endif
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*inode = *((struct ext2_inode *) scan->temp_buffer);
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if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES)
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retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
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scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES;
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} else {
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#if BB_BIG_ENDIAN
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if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
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ext2fs_swap_inode_full(scan->fs,
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(struct ext2_inode_large *) inode,
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(struct ext2_inode_large *) scan->ptr,
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0, bufsize);
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else
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#endif
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memcpy(inode, scan->ptr, bufsize);
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scan->ptr += scan->inode_size;
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scan->bytes_left -= scan->inode_size;
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if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK)
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retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
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}
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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 retval;
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}
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errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino,
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struct ext2_inode *inode)
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{
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return ext2fs_get_next_inode_full(scan, ino, inode,
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sizeof(struct ext2_inode));
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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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errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
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struct ext2_inode * inode, int bufsize)
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{
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unsigned long group, block, block_nr, offset;
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char *ptr;
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errcode_t retval;
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int clen, i, inodes_per_block, length;
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io_channel io;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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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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/* Create inode cache if not present */
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if (!fs->icache) {
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retval = create_icache(fs);
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if (retval)
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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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if (bufsize == sizeof(struct ext2_inode)) {
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/* only old good inode can be retrieve from the cache */
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for (i=0; i < fs->icache->cache_size; i++) {
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if (fs->icache->cache[i].ino == ino) {
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*inode = fs->icache->cache[i].inode;
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return 0;
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}
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}
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}
|
|
if ((ino == 0) || (ino > fs->super->s_inodes_count))
|
|
return EXT2_ET_BAD_INODE_NUM;
|
|
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
|
|
inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
|
|
block_nr = fs->image_header->offset_inode / fs->blocksize;
|
|
block_nr += (ino - 1) / inodes_per_block;
|
|
offset = ((ino - 1) % inodes_per_block) *
|
|
EXT2_INODE_SIZE(fs->super);
|
|
io = fs->image_io;
|
|
} else {
|
|
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
|
|
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
|
|
EXT2_INODE_SIZE(fs->super);
|
|
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
|
|
if (!fs->group_desc[(unsigned)group].bg_inode_table)
|
|
return EXT2_ET_MISSING_INODE_TABLE;
|
|
block_nr = fs->group_desc[(unsigned)group].bg_inode_table +
|
|
block;
|
|
io = fs->io;
|
|
}
|
|
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
|
|
|
|
length = EXT2_INODE_SIZE(fs->super);
|
|
if (bufsize < length)
|
|
length = bufsize;
|
|
|
|
ptr = (char *) inode;
|
|
while (length) {
|
|
clen = length;
|
|
if ((offset + length) > fs->blocksize)
|
|
clen = fs->blocksize - offset;
|
|
|
|
if (block_nr != fs->icache->buffer_blk) {
|
|
retval = io_channel_read_blk(io, block_nr, 1,
|
|
fs->icache->buffer);
|
|
if (retval)
|
|
return retval;
|
|
fs->icache->buffer_blk = block_nr;
|
|
}
|
|
|
|
memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset,
|
|
clen);
|
|
|
|
offset = 0;
|
|
length -= clen;
|
|
ptr += clen;
|
|
block_nr++;
|
|
}
|
|
|
|
#if BB_BIG_ENDIAN
|
|
if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
|
|
(fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
|
|
ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode,
|
|
(struct ext2_inode_large *) inode,
|
|
0, length);
|
|
#endif
|
|
|
|
/* Update the inode cache */
|
|
fs->icache->cache_last = (fs->icache->cache_last + 1) %
|
|
fs->icache->cache_size;
|
|
fs->icache->cache[fs->icache->cache_last].ino = ino;
|
|
fs->icache->cache[fs->icache->cache_last].inode = *inode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino,
|
|
struct ext2_inode * inode)
|
|
{
|
|
return ext2fs_read_inode_full(fs, ino, inode,
|
|
sizeof(struct ext2_inode));
|
|
}
|
|
|
|
errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
|
|
struct ext2_inode * inode, int bufsize)
|
|
{
|
|
unsigned long group, block, block_nr, offset;
|
|
errcode_t retval = 0;
|
|
struct ext2_inode_large temp_inode, *w_inode;
|
|
char *ptr;
|
|
int clen, i, length;
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
/* Check to see if user provided an override function */
|
|
if (fs->write_inode) {
|
|
retval = (fs->write_inode)(fs, ino, inode);
|
|
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
|
|
return retval;
|
|
}
|
|
|
|
/* Check to see if the inode cache needs to be updated */
|
|
if (fs->icache) {
|
|
for (i=0; i < fs->icache->cache_size; i++) {
|
|
if (fs->icache->cache[i].ino == ino) {
|
|
fs->icache->cache[i].inode = *inode;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
retval = create_icache(fs);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
if (!(fs->flags & EXT2_FLAG_RW))
|
|
return EXT2_ET_RO_FILSYS;
|
|
|
|
if ((ino == 0) || (ino > fs->super->s_inodes_count))
|
|
return EXT2_ET_BAD_INODE_NUM;
|
|
|
|
length = bufsize;
|
|
if (length < EXT2_INODE_SIZE(fs->super))
|
|
length = EXT2_INODE_SIZE(fs->super);
|
|
|
|
if (length > (int) sizeof(struct ext2_inode_large)) {
|
|
w_inode = xmalloc(length);
|
|
} else
|
|
w_inode = &temp_inode;
|
|
memset(w_inode, 0, length);
|
|
|
|
#if BB_BIG_ENDIAN
|
|
if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
|
|
(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
|
|
ext2fs_swap_inode_full(fs, w_inode,
|
|
(struct ext2_inode_large *) inode,
|
|
1, bufsize);
|
|
else
|
|
#endif
|
|
memcpy(w_inode, inode, bufsize);
|
|
|
|
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
|
|
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
|
|
EXT2_INODE_SIZE(fs->super);
|
|
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
|
|
if (!fs->group_desc[(unsigned) group].bg_inode_table)
|
|
return EXT2_ET_MISSING_INODE_TABLE;
|
|
block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block;
|
|
|
|
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
|
|
|
|
length = EXT2_INODE_SIZE(fs->super);
|
|
if (length > bufsize)
|
|
length = bufsize;
|
|
|
|
ptr = (char *) w_inode;
|
|
|
|
while (length) {
|
|
clen = length;
|
|
if ((offset + length) > fs->blocksize)
|
|
clen = fs->blocksize - offset;
|
|
|
|
if (fs->icache->buffer_blk != block_nr) {
|
|
retval = io_channel_read_blk(fs->io, block_nr, 1,
|
|
fs->icache->buffer);
|
|
if (retval)
|
|
goto errout;
|
|
fs->icache->buffer_blk = block_nr;
|
|
}
|
|
|
|
|
|
memcpy((char *) fs->icache->buffer + (unsigned) offset,
|
|
ptr, clen);
|
|
|
|
retval = io_channel_write_blk(fs->io, block_nr, 1,
|
|
fs->icache->buffer);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
offset = 0;
|
|
ptr += clen;
|
|
length -= clen;
|
|
block_nr++;
|
|
}
|
|
|
|
fs->flags |= EXT2_FLAG_CHANGED;
|
|
errout:
|
|
if (w_inode && w_inode != &temp_inode)
|
|
free(w_inode);
|
|
return retval;
|
|
}
|
|
|
|
errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino,
|
|
struct ext2_inode *inode)
|
|
{
|
|
return ext2fs_write_inode_full(fs, ino, inode,
|
|
sizeof(struct ext2_inode));
|
|
}
|
|
|
|
/*
|
|
* This function should be called when writing a new inode. It makes
|
|
* sure that extra part of large inodes is initialized properly.
|
|
*/
|
|
errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino,
|
|
struct ext2_inode *inode)
|
|
{
|
|
struct ext2_inode *buf;
|
|
int size = EXT2_INODE_SIZE(fs->super);
|
|
struct ext2_inode_large *large_inode;
|
|
|
|
if (size == sizeof(struct ext2_inode))
|
|
return ext2fs_write_inode_full(fs, ino, inode,
|
|
sizeof(struct ext2_inode));
|
|
|
|
buf = xmalloc(size);
|
|
|
|
memset(buf, 0, size);
|
|
*buf = *inode;
|
|
|
|
large_inode = (struct ext2_inode_large *) buf;
|
|
large_inode->i_extra_isize = sizeof(struct ext2_inode_large) -
|
|
EXT2_GOOD_OLD_INODE_SIZE;
|
|
|
|
return ext2fs_write_inode_full(fs, ino, buf, size);
|
|
}
|
|
|
|
|
|
errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks)
|
|
{
|
|
struct ext2_inode inode;
|
|
int i;
|
|
errcode_t retval;
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
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, ext2_ino_t ino)
|
|
{
|
|
struct ext2_inode inode;
|
|
errcode_t retval;
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
if (ino > fs->super->s_inodes_count)
|
|
return EXT2_ET_BAD_INODE_NUM;
|
|
|
|
if (fs->check_directory) {
|
|
retval = (fs->check_directory)(fs, ino);
|
|
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
|
|
return retval;
|
|
}
|
|
retval = ext2fs_read_inode(fs, ino, &inode);
|
|
if (retval)
|
|
return retval;
|
|
if (!LINUX_S_ISDIR(inode.i_mode))
|
|
return EXT2_ET_NO_DIRECTORY;
|
|
return 0;
|
|
}
|
|
|