/* vi: set sw=4 ts=4: */ /* * 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) { ext2fs_free_mem(&ma->entries); ext2fs_free_mem(&ma); } ext2fs_free_mem(&brel->name); ext2fs_free_mem(&brel); return 0; }