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/*
* brel_ma.c
*
* Copyright (C) 1996, 1997 Theodore Ts'o.
*
* TODO: rewrite to not use a direct array!!! (Fortunately this
* module isn't really used yet.)
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
#include "brel.h"
static errcode_t bma_put(ext2_brel brel, blk_t old,
struct ext2_block_relocate_entry *ent);
static errcode_t bma_get(ext2_brel brel, blk_t old,
struct ext2_block_relocate_entry *ent);
static errcode_t bma_start_iter(ext2_brel brel);
static errcode_t bma_next(ext2_brel brel, blk_t *old,
struct ext2_block_relocate_entry *ent);
static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new);
static errcode_t bma_delete(ext2_brel brel, blk_t old);
static errcode_t bma_free(ext2_brel brel);
struct brel_ma {
__u32 magic;
blk_t max_block;
struct ext2_block_relocate_entry *entries;
};
errcode_t ext2fs_brel_memarray_create(char *name, blk_t max_block,
ext2_brel *new_brel)
{
ext2_brel brel = 0;
errcode_t retval;
struct brel_ma *ma = 0;
size_t size;
*new_brel = 0;
/*
* Allocate memory structures
*/
retval = ext2fs_get_mem(sizeof(struct ext2_block_relocation_table),
&brel);
if (retval)
goto errout;
memset(brel, 0, sizeof(struct ext2_block_relocation_table));
retval = ext2fs_get_mem(strlen(name)+1, &brel->name);
if (retval)
goto errout;
strcpy(brel->name, name);
retval = ext2fs_get_mem(sizeof(struct brel_ma), &ma);
if (retval)
goto errout;
memset(ma, 0, sizeof(struct brel_ma));
brel->priv_data = ma;
size = (size_t) (sizeof(struct ext2_block_relocate_entry) *
(max_block+1));
retval = ext2fs_get_mem(size, &ma->entries);
if (retval)
goto errout;
memset(ma->entries, 0, size);
ma->max_block = max_block;
/*
* Fill in the brel data structure
*/
brel->put = bma_put;
brel->get = bma_get;
brel->start_iter = bma_start_iter;
brel->next = bma_next;
brel->move = bma_move;
brel->delete = bma_delete;
brel->free = bma_free;
*new_brel = brel;
return 0;
errout:
bma_free(brel);
return retval;
}
static errcode_t bma_put(ext2_brel brel, blk_t old,
struct ext2_block_relocate_entry *ent)
{
struct brel_ma *ma;
ma = brel->priv_data;
if (old > ma->max_block)
return EXT2_ET_INVALID_ARGUMENT;
ma->entries[(unsigned)old] = *ent;
return 0;
}
static errcode_t bma_get(ext2_brel brel, blk_t old,
struct ext2_block_relocate_entry *ent)
{
struct brel_ma *ma;
ma = brel->priv_data;
if (old > ma->max_block)
return EXT2_ET_INVALID_ARGUMENT;
if (ma->entries[(unsigned)old].new == 0)
return ENOENT;
*ent = ma->entries[old];
return 0;
}
static errcode_t bma_start_iter(ext2_brel brel)
{
brel->current = 0;
return 0;
}
static errcode_t bma_next(ext2_brel brel, blk_t *old,
struct ext2_block_relocate_entry *ent)
{
struct brel_ma *ma;
ma = brel->priv_data;
while (++brel->current < ma->max_block) {
if (ma->entries[(unsigned)brel->current].new == 0)
continue;
*old = brel->current;
*ent = ma->entries[(unsigned)brel->current];
return 0;
}
*old = 0;
return 0;
}
static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new)
{
struct brel_ma *ma;
ma = brel->priv_data;
if ((old > ma->max_block) || (new > ma->max_block))
return EXT2_ET_INVALID_ARGUMENT;
if (ma->entries[(unsigned)old].new == 0)
return ENOENT;
ma->entries[(unsigned)new] = ma->entries[old];
ma->entries[(unsigned)old].new = 0;
return 0;
}
static errcode_t bma_delete(ext2_brel brel, blk_t old)
{
struct brel_ma *ma;
ma = brel->priv_data;
if (old > ma->max_block)
return EXT2_ET_INVALID_ARGUMENT;
if (ma->entries[(unsigned)old].new == 0)
return ENOENT;
ma->entries[(unsigned)old].new = 0;
return 0;
}
static errcode_t bma_free(ext2_brel brel)
{
struct brel_ma *ma;
if (!brel)
return 0;
ma = brel->priv_data;
if (ma) {
if (ma->entries)
ext2fs_free_mem(&ma->entries);
ext2fs_free_mem(&ma);
}
if (brel->name)
ext2fs_free_mem(&brel->name);
ext2fs_free_mem(&brel);
return 0;
}
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