mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2025-01-21 16:03:24 +08:00
133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* dirinfo.c --- maintains the directory information table for e2fsck.
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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 <et/com_err.h>
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#include "e2fsck.h"
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static int dir_info_count = 0;
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static int dir_info_size = 0;
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static struct dir_info *dir_info = 0;
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int get_num_dirs(ext2_filsys fs)
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{
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int i, num_dirs;
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num_dirs = 0;
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for (i = 0; i < fs->group_desc_count; i++)
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num_dirs += fs->group_desc[i].bg_used_dirs_count;
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return num_dirs;
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}
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/*
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* This subroutine is called during pass1 to create a directory info
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* entry. During pass1, the passed-in parent is 0; it will get filled
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* in during pass2.
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*/
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void add_dir_info(ext2_filsys fs, ino_t ino, ino_t parent)
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{
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struct dir_info *dir;
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int i, j;
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#if 0
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printf("add_dir_info for inode %lu...\n", ino);
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#endif
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if (!dir_info) {
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dir_info_count = 0;
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dir_info_size = get_num_dirs(fs) + 10;
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dir_info = allocate_memory(dir_info_size *
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sizeof (struct dir_info),
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"directory map");
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}
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if (dir_info_count >= dir_info_size) {
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dir_info_size += 10;
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dir_info = realloc(dir_info,
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dir_info_size * sizeof(struct dir_info));
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}
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/*
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* Normally, add_dir_info is called with each inode in
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* sequential order; but once in a while (like when pass 3
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* needs to recreate the root directory or lost+found
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* directory) it is called out of order. In those cases, we
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* need to move the dir_info entries down to make room, since
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* the dir_info array needs to be sorted by inode number for
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* get_dir_info()'s sake.
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*/
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if (dir_info_count && dir_info[dir_info_count-1].ino >= ino) {
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for (i = dir_info_count-1; i > 0; i--)
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if (dir_info[i-1].ino < ino)
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break;
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dir = &dir_info[i];
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if (dir->ino != ino)
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for (j = dir_info_count++; j > i; j--)
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dir_info[j] = dir_info[j-1];
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} else
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dir = &dir_info[dir_info_count++];
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dir->ino = ino;
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dir->dotdot = parent;
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dir->parent = parent;
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}
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/*
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* get_dir_info() --- given an inode number, try to find the directory
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* information entry for it.
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*/
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struct dir_info *get_dir_info(ino_t ino)
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{
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int low, high, mid;
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low = 0;
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high = dir_info_count-1;
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if (!dir_info)
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return 0;
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if (ino == dir_info[low].ino)
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return &dir_info[low];
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if (ino == dir_info[high].ino)
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return &dir_info[high];
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while (low < high) {
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mid = (low+high)/2;
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if (mid == low || mid == high)
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break;
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if (ino == dir_info[mid].ino)
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return &dir_info[mid];
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if (ino < dir_info[mid].ino)
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high = mid;
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else
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low = mid;
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}
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return 0;
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}
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/*
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* Free the dir_info structure when it isn't needed any more.
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*/
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void free_dir_info(ext2_filsys fs)
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{
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if (dir_info) {
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free(dir_info);
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dir_info = 0;
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}
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dir_info_size = 0;
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dir_info_count = 0;
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}
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/*
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* A simple interator function
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*/
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struct dir_info *dir_info_iter(int *control)
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{
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if (*control >= dir_info_count)
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return 0;
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return(dir_info + (*control)++);
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}
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