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261 lines
5.5 KiB
C
261 lines
5.5 KiB
C
/*
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* dblist.c -- directory block list functions
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*
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* Copyright 1997 by 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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*/
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#include <stdio.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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#include <string.h>
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#include <time.h>
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#include "ext2_fs.h"
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#include "ext2fsP.h"
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static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b);
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/*
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* Returns the number of directories in the filesystem as reported by
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* the group descriptors. Of course, the group descriptors could be
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* wrong!
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*/
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errcode_t ext2fs_get_num_dirs(ext2_filsys fs, ext2_ino_t *ret_num_dirs)
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{
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dgrp_t i;
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ext2_ino_t num_dirs, max_dirs;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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num_dirs = 0;
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max_dirs = fs->super->s_inodes_per_group;
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for (i = 0; i < fs->group_desc_count; i++) {
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if (fs->group_desc[i].bg_used_dirs_count > max_dirs)
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num_dirs += max_dirs / 8;
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else
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num_dirs += fs->group_desc[i].bg_used_dirs_count;
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}
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if (num_dirs > fs->super->s_inodes_count)
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num_dirs = fs->super->s_inodes_count;
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*ret_num_dirs = num_dirs;
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return 0;
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}
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/*
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* helper function for making a new directory block list (for
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* initialize and copy).
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*/
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static errcode_t make_dblist(ext2_filsys fs, ext2_ino_t size, ext2_ino_t count,
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struct ext2_db_entry *list,
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ext2_dblist *ret_dblist)
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{
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ext2_dblist dblist;
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errcode_t retval;
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size_t len;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if ((ret_dblist == 0) && fs->dblist &&
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(fs->dblist->magic == EXT2_ET_MAGIC_DBLIST))
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return 0;
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retval = ext2fs_get_mem(sizeof(struct ext2_struct_dblist), &dblist);
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if (retval)
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return retval;
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memset(dblist, 0, sizeof(struct ext2_struct_dblist));
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dblist->magic = EXT2_ET_MAGIC_DBLIST;
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dblist->fs = fs;
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if (size)
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dblist->size = size;
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else {
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retval = ext2fs_get_num_dirs(fs, &dblist->size);
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if (retval)
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goto cleanup;
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dblist->size = (dblist->size * 2) + 12;
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}
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len = (size_t) sizeof(struct ext2_db_entry) * dblist->size;
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dblist->count = count;
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retval = ext2fs_get_mem(len, &dblist->list);
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if (retval)
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goto cleanup;
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if (list)
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memcpy(dblist->list, list, len);
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else
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memset(dblist->list, 0, len);
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if (ret_dblist)
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*ret_dblist = dblist;
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else
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fs->dblist = dblist;
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return 0;
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cleanup:
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if (dblist)
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ext2fs_free_mem(&dblist);
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return retval;
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}
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/*
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* Initialize a directory block list
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*/
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errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist)
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{
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ext2_dblist dblist;
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errcode_t retval;
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retval = make_dblist(fs, 0, 0, 0, &dblist);
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if (retval)
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return retval;
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dblist->sorted = 1;
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if (ret_dblist)
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*ret_dblist = dblist;
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else
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fs->dblist = dblist;
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return 0;
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}
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/*
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* Copy a directory block list
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*/
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errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
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{
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ext2_dblist dblist;
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errcode_t retval;
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retval = make_dblist(src->fs, src->size, src->count, src->list,
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&dblist);
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if (retval)
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return retval;
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dblist->sorted = src->sorted;
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*dest = dblist;
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return 0;
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}
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/*
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* Close a directory block list
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*
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* (moved to closefs.c)
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*/
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/*
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* Add a directory block to the directory block list
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*/
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errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
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int blockcnt)
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{
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struct ext2_db_entry *new_entry;
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errcode_t retval;
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unsigned long old_size;
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EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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if (dblist->count >= dblist->size) {
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old_size = dblist->size * sizeof(struct ext2_db_entry);
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dblist->size += 100;
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retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
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sizeof(struct ext2_db_entry),
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&dblist->list);
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if (retval) {
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dblist->size -= 100;
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return retval;
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}
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}
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new_entry = dblist->list + ( (int) dblist->count++);
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new_entry->blk = blk;
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new_entry->ino = ino;
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new_entry->blockcnt = blockcnt;
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dblist->sorted = 0;
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return 0;
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}
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/*
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* Change the directory block to the directory block list
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*/
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errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
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int blockcnt)
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{
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dgrp_t i;
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EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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for (i=0; i < dblist->count; i++) {
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if ((dblist->list[i].ino != ino) ||
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(dblist->list[i].blockcnt != blockcnt))
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continue;
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dblist->list[i].blk = blk;
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dblist->sorted = 0;
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return 0;
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}
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return EXT2_ET_DB_NOT_FOUND;
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}
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void ext2fs_dblist_sort(ext2_dblist dblist,
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EXT2_QSORT_TYPE (*sortfunc)(const void *,
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const void *))
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{
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if (!sortfunc)
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sortfunc = dir_block_cmp;
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qsort(dblist->list, (size_t) dblist->count,
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sizeof(struct ext2_db_entry), sortfunc);
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dblist->sorted = 1;
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}
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/*
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* This function iterates over the directory block list
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*/
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errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
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int (*func)(ext2_filsys fs,
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struct ext2_db_entry *db_info,
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void *priv_data),
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void *priv_data)
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{
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ext2_ino_t i;
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int ret;
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EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
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if (!dblist->sorted)
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ext2fs_dblist_sort(dblist, 0);
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for (i=0; i < dblist->count; i++) {
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ret = (*func)(dblist->fs, &dblist->list[(int)i], priv_data);
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if (ret & DBLIST_ABORT)
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return 0;
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}
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return 0;
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}
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static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b)
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{
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const struct ext2_db_entry *db_a =
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(const struct ext2_db_entry *) a;
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const struct ext2_db_entry *db_b =
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(const struct ext2_db_entry *) b;
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if (db_a->blk != db_b->blk)
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return (int) (db_a->blk - db_b->blk);
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if (db_a->ino != db_b->ino)
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return (int) (db_a->ino - db_b->ino);
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return (int) (db_a->blockcnt - db_b->blockcnt);
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}
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int ext2fs_dblist_count(ext2_dblist dblist)
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{
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return (int) dblist->count;
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}
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