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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* serialize_fstree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "common.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static sqfs_inode_generic_t *tree_node_to_inode(tree_node_t *node)
{
sqfs_inode_generic_t *inode;
size_t extra = 0;
if (S_ISLNK(node->mode))
extra = strlen(node->data.target);
inode = calloc(1, sizeof(*inode) + extra);
if (inode == NULL) {
perror("creating inode");
return NULL;
}
switch (node->mode & S_IFMT) {
case S_IFSOCK:
inode->base.type = SQFS_INODE_SOCKET;
inode->data.ipc.nlink = node->link_count;
break;
case S_IFIFO:
inode->base.type = SQFS_INODE_FIFO;
inode->data.ipc.nlink = node->link_count;
break;
case S_IFLNK:
assert(!(node->flags & FLAG_LINK_IS_HARD));
inode->base.type = SQFS_INODE_SLINK;
inode->data.slink.nlink = node->link_count;
inode->data.slink.target_size = extra;
memcpy(inode->extra, node->data.target, extra);
break;
case S_IFBLK:
inode->base.type = SQFS_INODE_BDEV;
inode->data.dev.nlink = node->link_count;
inode->data.dev.devno = node->data.devno;
break;
case S_IFCHR:
inode->base.type = SQFS_INODE_CDEV;
inode->data.dev.nlink = node->link_count;
inode->data.dev.devno = node->data.devno;
break;
default:
assert(0);
}
return inode;
}
static sqfs_inode_generic_t *write_dir_entries(const char *filename,
sqfs_dir_writer_t *dirw,
tree_node_t *node)
{
sqfs_u32 xattr, parent_inode;
sqfs_inode_generic_t *inode;
tree_node_t *it, *tgt;
int ret;
ret = sqfs_dir_writer_begin(dirw, 0);
if (ret)
goto fail;
for (it = node->data.children; it != NULL; it = it->next) {
if (S_ISLNK(it->mode) && (it->flags & FLAG_LINK_IS_HARD)) {
tgt = it->data.target_node;
} else {
tgt = it;
}
ret = sqfs_dir_writer_add_entry(dirw, it->name, tgt->inode_num,
tgt->inode_ref, tgt->mode);
if (ret)
goto fail;
}
ret = sqfs_dir_writer_end(dirw);
if (ret)
goto fail;
xattr = node->xattr_idx;
parent_inode = (node->parent == NULL) ? 0 : node->parent->inode_num;
inode = sqfs_dir_writer_create_inode(dirw, 0, xattr, parent_inode);
if (inode == NULL) {
ret = SQFS_ERROR_ALLOC;
goto fail;
}
if (inode->base.type == SQFS_INODE_DIR) {
inode->data.dir.nlink = node->link_count;
} else {
inode->data.dir_ext.nlink = node->link_count;
}
return inode;
fail:
sqfs_perror(filename, "recoding directory entries", ret);
return NULL;
}
static int serialize_tree_node(const char *filename, sqfs_writer_t *wr,
tree_node_t *n)
{
sqfs_inode_generic_t *inode;
sqfs_u32 offset;
sqfs_u64 block;
int ret;
if (S_ISDIR(n->mode)) {
inode = write_dir_entries(filename, wr->dirwr, n);
ret = SQFS_ERROR_INTERNAL;
} else if (S_ISREG(n->mode)) {
inode = n->data.file.inode;
n->data.file.inode = NULL;
ret = SQFS_ERROR_INTERNAL;
if (inode->base.type == SQFS_INODE_FILE && n->link_count > 1) {
sqfs_inode_make_extended(inode);
inode->data.file_ext.nlink = n->link_count;
} else {
inode->data.file_ext.nlink = n->link_count;
}
} else {
inode = tree_node_to_inode(n);
ret = SQFS_ERROR_ALLOC;
}
if (inode == NULL)
return ret;
inode->base.mode = n->mode;
inode->base.mod_time = n->mod_time;
inode->base.inode_number = n->inode_num;
sqfs_inode_set_xattr_index(inode, n->xattr_idx);
if (n->xattr_idx == 0xFFFFFFFF && !S_ISDIR(n->mode))
sqfs_inode_make_basic(inode);
ret = sqfs_id_table_id_to_index(wr->idtbl, n->uid,
&inode->base.uid_idx);
if (ret)
goto out;
ret = sqfs_id_table_id_to_index(wr->idtbl, n->gid,
&inode->base.gid_idx);
if (ret)
goto out;
sqfs_meta_writer_get_position(wr->im, &block, &offset);
n->inode_ref = (block << 16) | offset;
ret = sqfs_meta_writer_write_inode(wr->im, inode);
out:
free(inode);
return ret;
}
int sqfs_serialize_fstree(const char *filename, sqfs_writer_t *wr)
{
size_t i;
int ret;
wr->super.inode_table_start = wr->outfile->get_size(wr->outfile);
for (i = 0; i < wr->fs.unique_inode_count; ++i) {
ret = serialize_tree_node(filename, wr, wr->fs.inodes[i]);
if (ret)
goto out;
}
ret = sqfs_meta_writer_flush(wr->im);
if (ret)
goto out;
ret = sqfs_meta_writer_flush(wr->dm);
if (ret)
goto out;
wr->super.root_inode_ref = wr->fs.root->inode_ref;
wr->super.directory_table_start = wr->outfile->get_size(wr->outfile);
ret = sqfs_meta_write_write_to_file(wr->dm);
if (ret)
goto out;
ret = 0;
out:
if (ret)
sqfs_perror(filename, "storing filesystem tree", ret);
return ret;
}
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