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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* post_process.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
static int alloc_inode_num_dfs(fstree_t *fs, tree_node_t *root)
{
bool has_subdirs = false;
tree_node_t *it;
size_t inum;
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (S_ISDIR(it->mode)) {
has_subdirs = true;
break;
}
}
if (has_subdirs) {
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (S_ISDIR(it->mode)) {
if (alloc_inode_num_dfs(fs, it))
return -1;
}
}
}
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (it->mode != FSTREE_MODE_HARD_LINK_RESOLVED) {
if (SZ_ADD_OV(fs->unique_inode_count, 1, &inum))
goto fail_ov;
if ((sizeof(size_t) > sizeof(sqfs_u32)) &&
inum > 0x0FFFFFFFFUL) {
goto fail_ov;
}
it->inode_num = (sqfs_u32)inum;
fs->unique_inode_count = inum;
}
}
return 0;
fail_ov:
fputs("Too many inodes.\n", stderr);
return -1;
}
static file_info_t *file_list_dfs(tree_node_t *n)
{
if (S_ISREG(n->mode)) {
n->data.file.next = NULL;
return &n->data.file;
}
if (S_ISDIR(n->mode)) {
file_info_t *list = NULL, *last = NULL;
for (n = n->data.dir.children; n != NULL; n = n->next) {
if (list == NULL) {
list = file_list_dfs(n);
if (list == NULL)
continue;
last = list;
} else {
last->next = file_list_dfs(n);
}
while (last->next != NULL)
last = last->next;
}
return list;
}
return NULL;
}
static void map_inodes_dfs(fstree_t *fs, tree_node_t *n)
{
if (n->mode == FSTREE_MODE_HARD_LINK_RESOLVED)
return;
fs->inodes[n->inode_num - 1] = n;
if (S_ISDIR(n->mode)) {
for (n = n->data.dir.children; n != NULL; n = n->next)
map_inodes_dfs(fs, n);
}
}
static void reorder_hard_links(fstree_t *fs)
{
size_t i, j, tgt_idx;
tree_node_t *it, *tgt;
for (i = 0; i < fs->unique_inode_count; ++i) {
if (!S_ISDIR(fs->inodes[i]->mode))
continue;
it = fs->inodes[i]->data.dir.children;
for (; it != NULL; it = it->next) {
if (it->mode != FSTREE_MODE_HARD_LINK_RESOLVED)
continue;
tgt = it->data.target_node;
tgt_idx = tgt->inode_num - 1;
if (tgt_idx <= i)
continue;
for (j = tgt_idx; j > i; --j) {
fs->inodes[j] = fs->inodes[j - 1];
fs->inodes[j]->inode_num += 1;
}
fs->inodes[i] = tgt;
/* XXX: the possible overflow is checked for
during allocation */
tgt->inode_num = (sqfs_u32)(i + 1);
++i;
}
}
}
int fstree_post_process(fstree_t *fs)
{
size_t inum;
if (fstree_resolve_hard_links(fs))
return -1;
fs->unique_inode_count = 0;
if (alloc_inode_num_dfs(fs, fs->root))
return -1;
if (SZ_ADD_OV(fs->unique_inode_count, 1, &inum))
goto fail_root_ov;
if ((sizeof(size_t) > sizeof(sqfs_u32)) && inum > 0x0FFFFFFFFUL)
goto fail_root_ov;
fs->root->inode_num = (sqfs_u32)inum;
fs->unique_inode_count = inum;
fs->inodes = calloc(sizeof(fs->inodes[0]), fs->unique_inode_count);
if (fs->inodes == NULL) {
perror("Allocating inode list");
return -1;
}
map_inodes_dfs(fs, fs->root);
reorder_hard_links(fs);
fs->files = file_list_dfs(fs->root);
return 0;
fail_root_ov:
fputs("Too many inodes, cannot allocate number for root.\n", stderr);
return -1;
}
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