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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* hardlink.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "common.h"
#include "util/rbtree.h"
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
static int map_nodes(rbtree_t *inumtree, sqfs_hard_link_t **out,
const sqfs_tree_node_t *n)
{
const sqfs_tree_node_t *target;
sqfs_hard_link_t *lnk;
rbtree_node_t *tn;
sqfs_u32 idx;
int ret;
/* XXX: refuse to generate hard links to directories */
if (n->children != NULL) {
for (n = n->children; n != NULL; n = n->next) {
if (map_nodes(inumtree, out, n))
return -1;
}
return 0;
}
if (!is_filename_sane((const char *)n->name, false))
return 0;
idx = n->inode->base.inode_number;
tn = rbtree_lookup(inumtree, &idx);
if (tn == NULL) {
ret = rbtree_insert(inumtree, &idx, &n);
if (ret != 0)
goto fail_insert;
return 0;
}
target = *((const sqfs_tree_node_t **)rbtree_node_value(tn));
lnk = calloc(1, sizeof(*lnk));
if (lnk == NULL)
goto fail_oom;
lnk->inode_number = idx;
ret = sqfs_tree_node_get_path(target, &lnk->target);
if (ret != 0)
goto fail_path;
if (canonicalize_name(lnk->target) == 0) {
lnk->next = (*out);
(*out) = lnk;
} else {
sqfs_free(lnk->target);
free(lnk);
}
return 0;
fail_path:
sqfs_perror(NULL, "re-constructing hard link path", ret);
free(lnk);
return -1;
fail_oom:
fputs("detecting hard links in file system tree: out of memory\n",
stderr);
free(lnk);
return -1;
fail_insert:
sqfs_perror(NULL, "detecting hard links in file system tree", ret);
return -1;
}
static int compare_inum(const void *ctx, const void *lhs, const void *rhs)
{
sqfs_u32 l = *((const sqfs_u32 *)lhs), r = *((const sqfs_u32 *)rhs);
(void)ctx;
return l < r ? -1 : (l > r ? 1 : 0);
}
int sqfs_tree_find_hard_links(const sqfs_tree_node_t *root,
sqfs_hard_link_t **out)
{
sqfs_hard_link_t *lnk = NULL;
rbtree_t inumtree;
int ret;
ret = rbtree_init(&inumtree, sizeof(sqfs_u32),
sizeof(sqfs_tree_node_t *),
compare_inum);
if (ret != 0) {
sqfs_perror(NULL,
"detecting hard links in file system tree", ret);
return -1;
}
ret = map_nodes(&inumtree, out, root);
rbtree_cleanup(&inumtree);
if (ret != 0) {
while ((*out) != NULL) {
lnk = (*out);
(*out) = lnk->next;
free(lnk->target);
free(lnk);
}
return -1;
}
return 0;
}
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