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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "meta_writer.h"
#include "util.h"
#include <assert.h>
#include <endian.h>
#include <stdlib.h>
#include <string.h>
static int get_type(tree_node_t *node)
{
int type;
switch (node->mode & S_IFMT) {
case S_IFSOCK: type = SQFS_INODE_SOCKET; break;
case S_IFIFO: type = SQFS_INODE_FIFO; break;
case S_IFLNK: type = SQFS_INODE_SLINK; break;
case S_IFBLK: type = SQFS_INODE_BDEV; break;
case S_IFCHR: type = SQFS_INODE_CDEV; break;
case S_IFDIR: type = SQFS_INODE_DIR; break;
case S_IFREG: type = SQFS_INODE_FILE; break;
default:
assert(0);
}
if (node->xattr != NULL)
type = SQFS_INODE_EXT_TYPE(type);
return type;
}
static size_t hard_link_count(tree_node_t *n)
{
size_t count;
if (S_ISDIR(n->mode)) {
count = 2;
for (n = n->data.dir->children; n != NULL; n = n->next)
++count;
return count;
}
return 1;
}
int meta_writer_write_inode(fstree_t *fs, id_table_t *idtbl, meta_writer_t *im,
meta_writer_t *dm, tree_node_t *node)
{
dir_index_t *diridx = NULL;
uint16_t uid_idx, gid_idx;
file_info_t *fi = NULL;
dir_info_t *di = NULL;
uint32_t bs, offset;
sqfs_inode_t base;
uint64_t i, block;
int type;
if (id_table_id_to_index(idtbl, node->uid, &uid_idx))
return -1;
if (id_table_id_to_index(idtbl, node->gid, &gid_idx))
return -1;
meta_writer_get_position(im, &block, &offset);
node->inode_ref = (block << 16) | offset;
type = get_type(node);
if (S_ISDIR(node->mode)) {
di = node->data.dir;
if (meta_writer_write_dir(dm, di, &diridx))
return -1;
if ((di->start_block) > 0xFFFFFFFFUL || di->size > 0xFFFF ||
node->xattr != NULL) {
type = SQFS_INODE_EXT_DIR;
} else {
type = SQFS_INODE_DIR;
free(diridx);
diridx = NULL;
}
} else if (S_ISREG(node->mode)) {
fi = node->data.file;
if (fi->startblock > 0xFFFFFFFFUL || fi->size > 0xFFFFFFFFUL ||
hard_link_count(node) > 1 || fi->sparse > 0) {
type = SQFS_INODE_EXT_FILE;
}
}
base.type = htole16(type);
base.mode = htole16(node->mode);
base.uid_idx = htole16(uid_idx);
base.gid_idx = htole16(gid_idx);
base.mod_time = htole32(fs->defaults.st_mtime);
base.inode_number = htole32(node->inode_num);
if (meta_writer_append(im, &base, sizeof(base))) {
free(diridx);
return -1;
}
switch (type) {
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET: {
sqfs_inode_ipc_t ipc = {
.nlink = hard_link_count(node),
};
return meta_writer_append(im, &ipc, sizeof(ipc));
}
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET: {
sqfs_inode_ipc_ext_t ipc = {
.nlink = hard_link_count(node),
.xattr_idx = htole32(0xFFFFFFFF),
};
if (node->xattr != NULL)
ipc.xattr_idx = htole32(node->xattr->index);
return meta_writer_append(im, &ipc, sizeof(ipc));
}
case SQFS_INODE_SLINK: {
sqfs_inode_slink_t slink = {
.nlink = htole32(hard_link_count(node)),
.target_size = htole32(strlen(node->data.slink_target)),
};
if (meta_writer_append(im, &slink, sizeof(slink)))
return -1;
if (meta_writer_append(im, node->data.slink_target,
le32toh(slink.target_size))) {
return -1;
}
break;
}
case SQFS_INODE_EXT_SLINK: {
sqfs_inode_slink_t slink = {
.nlink = htole32(hard_link_count(node)),
.target_size = htole32(strlen(node->data.slink_target)),
};
uint32_t xattr = htole32(0xFFFFFFFF);
if (node->xattr != NULL)
xattr = htole32(node->xattr->index);
if (meta_writer_append(im, &slink, sizeof(slink)))
return -1;
if (meta_writer_append(im, node->data.slink_target,
le32toh(slink.target_size))) {
return -1;
}
if (meta_writer_append(im, &xattr, sizeof(xattr)))
return -1;
break;
}
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV: {
sqfs_inode_dev_t dev = {
.nlink = htole32(hard_link_count(node)),
.devno = htole32(node->data.devno),
};
return meta_writer_append(im, &dev, sizeof(dev));
}
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV: {
sqfs_inode_dev_ext_t dev = {
.nlink = htole32(hard_link_count(node)),
.devno = htole32(node->data.devno),
.xattr_idx = htole32(0xFFFFFFFF),
};
if (node->xattr != NULL)
dev.xattr_idx = htole32(node->xattr->index);
return meta_writer_append(im, &dev, sizeof(dev));
}
case SQFS_INODE_EXT_FILE: {
sqfs_inode_file_ext_t ext = {
.blocks_start = htole64(fi->startblock),
.file_size = htole64(fi->size),
.sparse = htole64(fi->sparse),
.nlink = htole32(hard_link_count(node)),
.fragment_idx = htole32(0xFFFFFFFF),
.fragment_offset = htole32(0xFFFFFFFF),
.xattr_idx = htole32(0xFFFFFFFF),
};
if ((fi->size % fs->block_size) != 0) {
ext.fragment_idx = htole32(fi->fragment);
ext.fragment_offset = htole32(fi->fragment_offset);
}
if (node->xattr != NULL)
ext.xattr_idx = htole32(node->xattr->index);
if (meta_writer_append(im, &ext, sizeof(ext)))
return -1;
goto out_file_blocks;
}
case SQFS_INODE_FILE: {
sqfs_inode_file_t reg = {
.blocks_start = htole32(fi->startblock),
.fragment_index = htole32(0xFFFFFFFF),
.fragment_offset = htole32(0xFFFFFFFF),
.file_size = htole32(fi->size),
};
if ((fi->size % fs->block_size) != 0) {
reg.fragment_index = htole32(fi->fragment);
reg.fragment_offset = htole32(fi->fragment_offset);
}
if (meta_writer_append(im, ®, sizeof(reg)))
return -1;
goto out_file_blocks;
}
case SQFS_INODE_DIR: {
sqfs_inode_dir_t dir = {
.start_block = htole32(node->data.dir->start_block),
.nlink = htole32(hard_link_count(node)),
.size = htole16(node->data.dir->size),
.offset = htole16(node->data.dir->block_offset),
.parent_inode = node->parent ?
htole32(node->parent->inode_num) : htole32(1),
};
return meta_writer_append(im, &dir, sizeof(dir));
}
case SQFS_INODE_EXT_DIR: {
sqfs_dir_index_t idx;
size_t i;
sqfs_inode_dir_ext_t ext = {
.nlink = htole32(hard_link_count(node)),
.size = htole32(node->data.dir->size),
.start_block = htole32(node->data.dir->start_block),
.parent_inode = node->parent ?
htole32(node->parent->inode_num) : htole32(1),
.inodex_count = htole32(0),
.offset = htole16(node->data.dir->block_offset),
.xattr_idx = htole32(0xFFFFFFFF),
};
if (node->xattr != NULL)
ext.xattr_idx = htole32(node->xattr->index);
if (meta_writer_append(im, &ext, sizeof(ext))) {
free(diridx);
return -1;
}
/* HACK: truncated index for empty directories */
if (node->data.dir->size == 0)
break;
ext.inodex_count = htole32(diridx->num_nodes - 1);
for (i = 0; i < diridx->num_nodes; ++i) {
idx.start_block = htole32(diridx->idx_nodes[i].block);
idx.index = htole32(diridx->idx_nodes[i].offset);
idx.size = strlen(diridx->idx_nodes[i].node->name) - 1;
idx.size = htole32(idx.size);
if (meta_writer_append(im, &idx, sizeof(idx))) {
free(diridx);
return -1;
}
if (meta_writer_append(im,
diridx->idx_nodes[i].node->name,
le32toh(idx.size) + 1)) {
free(diridx);
return -1;
}
}
free(diridx);
break;
}
default:
assert(0);
}
return 0;
out_file_blocks:
for (i = 0; i < fi->size / fs->block_size; ++i) {
bs = htole32(fi->blocksizes[i]);
if (meta_writer_append(im, &bs, sizeof(bs)))
return -1;
}
if ((fi->size % fs->block_size) != 0 &&
(fi->fragment == 0xFFFFFFFF || fi->fragment_offset == 0xFFFFFFFF)) {
bs = htole32(0);
if (meta_writer_append(im, &bs, sizeof(bs)))
return -1;
}
return 0;
}
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