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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* serialize_fstree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/meta_writer.h"
#include "sqfs/inode.h"
#include "sqfs/dir.h"
#include "highlevel.h"
#include "util.h"
#include <assert.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static int get_type(tree_node_t *node)
{
switch (node->mode & S_IFMT) {
case S_IFSOCK: return SQFS_INODE_SOCKET;
case S_IFIFO: return SQFS_INODE_FIFO;
case S_IFLNK: return SQFS_INODE_SLINK;
case S_IFBLK: return SQFS_INODE_BDEV;
case S_IFCHR: return SQFS_INODE_CDEV;
}
assert(0);
}
static sqfs_inode_generic_t *tree_node_to_inode(sqfs_id_table_t *idtbl,
tree_node_t *node)
{
sqfs_inode_generic_t *inode;
sqfs_u16 uid_idx, gid_idx;
size_t extra = 0;
if (S_ISREG(node->mode)) {
inode = node->data.file.user_ptr;
node->data.file.user_ptr = NULL;
} else {
if (S_ISLNK(node->mode))
extra = strlen(node->data.slink_target);
inode = alloc_flex(sizeof(*inode), 1, extra);
if (inode == NULL) {
perror("creating inode from file system tree node");
return NULL;
}
if (S_ISLNK(node->mode)) {
inode->slink_target = (char *)inode->extra;
memcpy(inode->extra, node->data.slink_target, extra);
}
inode->base.type = get_type(node);
}
if (sqfs_id_table_id_to_index(idtbl, node->uid, &uid_idx))
goto fail;
if (sqfs_id_table_id_to_index(idtbl, node->gid, &gid_idx))
goto fail;
if (node->xattr_idx != 0xFFFFFFFF)
sqfs_inode_make_extended(inode);
inode->base.mode = node->mode;
inode->base.uid_idx = uid_idx;
inode->base.gid_idx = gid_idx;
inode->base.mod_time = node->mod_time;
inode->base.inode_number = node->inode_num;
switch (inode->base.type) {
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET:
inode->data.ipc.nlink = 1;
break;
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET:
inode->data.ipc_ext.nlink = 1;
inode->data.ipc_ext.xattr_idx = node->xattr_idx;
break;
case SQFS_INODE_SLINK:
inode->data.slink.nlink = 1;
inode->data.slink.target_size = extra;
break;
case SQFS_INODE_EXT_SLINK:
inode->data.slink_ext.nlink = 1;
inode->data.slink_ext.target_size = extra;
inode->data.slink_ext.xattr_idx = node->xattr_idx;
break;
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
inode->data.dev.nlink = 1;
inode->data.dev.devno = node->data.devno;
break;
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
inode->data.dev_ext.nlink = 1;
inode->data.dev_ext.devno = node->data.devno;
inode->data.dev_ext.xattr_idx = node->xattr_idx;
break;
case SQFS_INODE_FILE:
break;
case SQFS_INODE_EXT_FILE:
inode->data.file_ext.xattr_idx = node->xattr_idx;
break;
default:
goto fail;
}
return inode;
fail:
free(inode);
return NULL;
}
static sqfs_inode_generic_t *write_dir_entries(sqfs_dir_writer_t *dirw,
tree_node_t *node,
sqfs_id_table_t *idtbl)
{
sqfs_u32 xattr, parent_inode;
sqfs_inode_generic_t *inode;
tree_node_t *it;
int ret;
if (sqfs_dir_writer_begin(dirw, 0))
return NULL;
for (it = node->data.dir.children; it != NULL; it = it->next) {
ret = sqfs_dir_writer_add_entry(dirw, it->name, it->inode_num,
it->inode_ref, it->mode);
if (ret)
return NULL;
}
if (sqfs_dir_writer_end(dirw))
return NULL;
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) {
perror("creating inode");
return NULL;
}
if (sqfs_id_table_id_to_index(idtbl, node->uid, &inode->base.uid_idx))
goto fail_id;
if (sqfs_id_table_id_to_index(idtbl, node->gid, &inode->base.gid_idx))
goto fail_id;
inode->base.mode = node->mode;
inode->base.mod_time = node->mod_time;
inode->base.inode_number = node->inode_num;
return inode;
fail_id:
fputs("failed to allocate IDs\n", stderr);
free(inode);
return NULL;
}
int sqfs_serialize_fstree(sqfs_file_t *file, sqfs_super_t *super, fstree_t *fs,
sqfs_compressor_t *cmp, sqfs_id_table_t *idtbl)
{
sqfs_inode_generic_t *inode;
sqfs_meta_writer_t *im, *dm;
sqfs_dir_writer_t *dirwr;
sqfs_u32 offset;
sqfs_u64 block;
int ret = -1;
size_t i;
im = sqfs_meta_writer_create(file, cmp, 0);
if (im == NULL)
return -1;
dm = sqfs_meta_writer_create(file, cmp,
SQFS_META_WRITER_KEEP_IN_MEMORY);
if (dm == NULL)
goto out_im;
dirwr = sqfs_dir_writer_create(dm);
if (dirwr == NULL)
goto out_dm;
super->inode_table_start = file->get_size(file);
for (i = 0; i < fs->inode_tbl_size; ++i) {
if (S_ISDIR(fs->inode_table[i]->mode)) {
inode = write_dir_entries(dirwr, fs->inode_table[i],
idtbl);
} else {
inode = tree_node_to_inode(idtbl, fs->inode_table[i]);
}
if (inode == NULL)
goto out;
sqfs_meta_writer_get_position(im, &block, &offset);
fs->inode_table[i]->inode_ref = (block << 16) | offset;
if (sqfs_meta_writer_write_inode(im, inode)) {
free(inode);
goto out;
}
free(inode);
}
if (sqfs_meta_writer_flush(im))
goto out;
if (sqfs_meta_writer_flush(dm))
goto out;
super->root_inode_ref = fs->root->inode_ref;
super->directory_table_start = file->get_size(file);
if (sqfs_meta_write_write_to_file(dm))
goto out;
ret = 0;
out:
sqfs_dir_writer_destroy(dirwr);
out_dm:
sqfs_meta_writer_destroy(dm);
out_im:
sqfs_meta_writer_destroy(im);
return ret;
}
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