/* SPDX-License-Identifier: GPL-3.0-or-later */ /* * serialize_fstree.c * * Copyright (C) 2019 David Oberhollenzer */ #include "config.h" #include "sqfs/meta_writer.h" #include "sqfs/error.h" #include "sqfs/inode.h" #include "sqfs/dir.h" #include "highlevel.h" #include "util.h" #include #include #include #include #include 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.slink_target); inode = alloc_flex(sizeof(*inode), 1, 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 = 1; break; case S_IFIFO: inode->base.type = SQFS_INODE_FIFO; inode->data.ipc.nlink = 1; break; case S_IFLNK: inode->base.type = SQFS_INODE_SLINK; inode->data.slink.nlink = 1; inode->data.slink.target_size = extra; inode->slink_target = (char *)inode->extra; memcpy(inode->extra, node->data.slink_target, extra); break; case S_IFBLK: inode->base.type = SQFS_INODE_BDEV; inode->data.dev.nlink = 1; inode->data.dev.devno = node->data.devno; break; case S_IFCHR: inode->base.type = SQFS_INODE_CDEV; inode->data.dev.nlink = 1; 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; int ret; ret = sqfs_dir_writer_begin(dirw, 0); if (ret) goto fail; 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) 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; } return inode; fail: sqfs_perror(filename, "recoding directory entries", ret); return NULL; } int sqfs_serialize_fstree(const char *filename, 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; tree_node_t *n; int ret = -1; size_t i; im = sqfs_meta_writer_create(file, cmp, 0); if (im == NULL) { ret = SQFS_ERROR_ALLOC; goto out_err; } dm = sqfs_meta_writer_create(file, cmp, SQFS_META_WRITER_KEEP_IN_MEMORY); if (dm == NULL) { ret = SQFS_ERROR_ALLOC; goto out_im; } dirwr = sqfs_dir_writer_create(dm); if (dirwr == NULL) { ret = SQFS_ERROR_ALLOC; goto out_dm; } super->inode_table_start = file->get_size(file); for (i = 0; i < fs->inode_tbl_size; ++i) { n = fs->inode_table[i]; if (S_ISDIR(n->mode)) { inode = write_dir_entries(filename, dirwr, n); if (inode == NULL) { ret = 1; goto out; } } else if (S_ISREG(n->mode)) { inode = n->data.file.user_ptr; n->data.file.user_ptr = NULL; if (inode == NULL) { ret = SQFS_ERROR_INTERNAL; goto out; } } else { inode = tree_node_to_inode(n); if (inode == NULL) { ret = SQFS_ERROR_ALLOC; goto out; } } 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); ret = sqfs_id_table_id_to_index(idtbl, n->uid, &inode->base.uid_idx); if (ret) { free(inode); goto out; } ret = sqfs_id_table_id_to_index(idtbl, n->gid, &inode->base.gid_idx); if (ret) { free(inode); goto out; } sqfs_meta_writer_get_position(im, &block, &offset); fs->inode_table[i]->inode_ref = (block << 16) | offset; ret = sqfs_meta_writer_write_inode(im, inode); free(inode); if (ret) goto out; } ret = sqfs_meta_writer_flush(im); if (ret) goto out; ret = sqfs_meta_writer_flush(dm); if (ret) goto out; super->root_inode_ref = fs->root->inode_ref; super->directory_table_start = file->get_size(file); ret = sqfs_meta_write_write_to_file(dm); if (ret) goto out; ret = 0; out: sqfs_dir_writer_destroy(dirwr); out_dm: sqfs_meta_writer_destroy(dm); out_im: sqfs_meta_writer_destroy(im); out_err: if (ret < 0) { sqfs_perror(filename, "storing filesystem tree", ret); } return ret; }