diff options
Diffstat (limited to 'lib/common/writer/serialize_fstree.c')
| -rw-r--r-- | lib/common/writer/serialize_fstree.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/lib/common/writer/serialize_fstree.c b/lib/common/writer/serialize_fstree.c new file mode 100644 index 0000000..c69f0ea --- /dev/null +++ b/lib/common/writer/serialize_fstree.c @@ -0,0 +1,199 @@ +/* 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: + 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.dir.children; it != NULL; it = it->next) { + if (it->mode == FSTREE_MODE_HARD_LINK_RESOLVED) { + 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.user_ptr; + n->data.file.user_ptr = 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); + + 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; +} |