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-rw-r--r--mkfs/Makemodule.am2
-rw-r--r--mkfs/meta.c357
-rw-r--r--mkfs/mksquashfs.c3
-rw-r--r--mkfs/mksquashfs.h3
4 files changed, 364 insertions, 1 deletions
diff --git a/mkfs/Makemodule.am b/mkfs/Makemodule.am
index e5ef93c..fb56fcf 100644
--- a/mkfs/Makemodule.am
+++ b/mkfs/Makemodule.am
@@ -1,5 +1,5 @@
mksquashfs_SOURCES = mkfs/mksquashfs.c mkfs/mksquashfs.h mkfs/block.c
-mksquashfs_SOURCES += mkfs/options.c
+mksquashfs_SOURCES += mkfs/options.c mkfs/meta.c
mksquashfs_LDADD = libsquashfs.a libfstree.a libcompress.a libutil.a
if WITH_LZMA
diff --git a/mkfs/meta.c b/mkfs/meta.c
new file mode 100644
index 0000000..c48aec3
--- /dev/null
+++ b/mkfs/meta.c
@@ -0,0 +1,357 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "meta_writer.h"
+#include "mksquashfs.h"
+#include "util.h"
+
+#include <assert.h>
+#include <endian.h>
+
+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;
+}
+
+static int write_dir(meta_writer_t *dm, dir_info_t *dir)
+{
+ sqfs_dir_header_t hdr;
+ sqfs_dir_entry_t ent;
+ tree_node_t *c, *d;
+ size_t i, count;
+
+ c = dir->children;
+ dir->size = 0;
+
+ dir->start_block = dm->block_offset;
+ dir->block_offset = dm->offset;
+
+ while (c != NULL) {
+ count = 0;
+
+ for (d = c; d != NULL; d = d->next) {
+ if ((d->inode_ref >> 16) != (c->inode_ref >> 16))
+ break;
+ if ((d->inode_num - c->inode_num) > 0xFFFF)
+ break;
+ count += 1;
+ }
+
+ if (count > SQFS_MAX_DIR_ENT)
+ count = SQFS_MAX_DIR_ENT;
+
+ hdr.count = htole32(count - 1);
+ hdr.start_block = htole32(c->inode_ref >> 16);
+ hdr.inode_number = htole32(c->inode_num);
+ dir->size += sizeof(hdr);
+
+ if (meta_writer_append(dm, &hdr, sizeof(hdr)))
+ return -1;
+
+ d = c;
+
+ for (i = 0; i < count; ++i) {
+ ent.offset = htole16(c->inode_ref & 0x0000FFFF);
+ ent.inode_number = htole16(c->inode_num - d->inode_num);
+ ent.type = htole16(c->type);
+ ent.size = htole16(strlen(c->name) - 1);
+ dir->size += sizeof(ent) + strlen(c->name);
+
+ if (meta_writer_append(dm, &ent, sizeof(ent)))
+ return -1;
+ if (meta_writer_append(dm, c->name, strlen(c->name)))
+ return -1;
+
+ c = c->next;
+ }
+ }
+ return 0;
+}
+
+static int write_inode(sqfs_info_t *info, meta_writer_t *im, meta_writer_t *dm,
+ tree_node_t *node)
+{
+ uint16_t uid_idx, gid_idx;
+ file_info_t *fi = NULL;
+ dir_info_t *di = NULL;
+ sqfs_inode_t base;
+ uint32_t bs;
+ uint64_t i;
+
+ if (id_table_id_to_index(&info->idtbl, node->uid, &uid_idx))
+ return -1;
+
+ if (id_table_id_to_index(&info->idtbl, node->gid, &gid_idx))
+ return -1;
+
+ node->inode_ref = (im->block_offset << 16) | im->offset;
+ node->inode_num = info->inode_counter++;
+
+ info->super.inode_count += 1;
+
+ switch (node->mode & S_IFMT) {
+ case S_IFSOCK: node->type = SQFS_INODE_SOCKET; break;
+ case S_IFIFO: node->type = SQFS_INODE_FIFO; break;
+ case S_IFLNK: node->type = SQFS_INODE_SLINK; break;
+ case S_IFBLK: node->type = SQFS_INODE_BDEV; break;
+ case S_IFCHR: node->type = SQFS_INODE_CDEV; break;
+ case S_IFDIR:
+ di = node->data.dir;
+ node->type = SQFS_INODE_DIR;
+
+ if (write_dir(dm, di))
+ return -1;
+
+ if ((di->start_block) > 0xFFFFFFFFUL || di->size > 0xFFFF) {
+ node->type = SQFS_INODE_EXT_DIR;
+ }
+ break;
+ case S_IFREG:
+ fi = node->data.file;
+ node->type = SQFS_INODE_FILE;
+
+ if (fi->startblock > 0xFFFFFFFFUL || fi->size > 0xFFFFFFFFUL ||
+ hard_link_count(node) > 1) {
+ node->type = SQFS_INODE_EXT_FILE;
+ }
+ break;
+ default:
+ assert(0);
+ }
+
+ base.type = htole16(node->type);
+ base.mode = htole16(node->mode);
+ base.uid_idx = htole16(uid_idx);
+ base.gid_idx = htole16(gid_idx);
+ base.mod_time = htole32(info->opt.def_mtime);
+ base.inode_number = htole32(node->inode_num);
+
+ if (meta_writer_append(im, &base, sizeof(base)))
+ return -1;
+
+ switch (node->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_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_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_FILE: {
+ sqfs_inode_file_ext_t ext = {
+ .blocks_start = htole64(fi->startblock),
+ .file_size = htole64(fi->size),
+ .sparse = htole64(0xFFFFFFFFFFFFFFFFUL),
+ .nlink = htole32(hard_link_count(node)),
+ .fragment_idx = htole32(fi->fragment),
+ .fragment_offset = htole32(fi->fragment_offset),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ 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(fi->fragment),
+ .fragment_offset = htole32(fi->fragment_offset),
+ .file_size = htole32(fi->size),
+ };
+
+ if (meta_writer_append(im, &reg, 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_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),
+ };
+
+ return meta_writer_append(im, &ext, sizeof(ext));
+ }
+ default:
+ assert(0);
+ }
+ return 0;
+out_file_blocks:
+ for (i = 0; i < fi->size / info->super.block_size; ++i) {
+ bs = htole32(fi->blocksizes[i]);
+
+ if (meta_writer_append(im, &bs, sizeof(bs)))
+ return -1;
+ }
+ return 0;
+}
+
+static int write_child_inodes(sqfs_info_t *info, meta_writer_t *im,
+ meta_writer_t *dm, tree_node_t *root)
+{
+ bool has_subdirs = false;
+ tree_node_t *it;
+
+ for (it = root->data.dir->children; it != NULL; it = it->next) {
+ if (S_ISDIR(it->mode)) {
+ has_subdirs = true;
+ break;
+ }
+ }
+
+ if (has_subdirs) {
+ for (it = root->data.dir->children; it != NULL; it = it->next) {
+ if (!S_ISDIR(it->mode))
+ continue;
+
+ if (write_child_inodes(info, im, dm, it))
+ return -1;
+ }
+ }
+
+ for (it = root->data.dir->children; it != NULL; it = it->next) {
+ if (write_inode(info, im, dm, it))
+ return -1;
+ }
+
+ return 0;
+}
+
+int sqfs_write_inodes(sqfs_info_t *info)
+{
+ meta_writer_t *im, *dm;
+ size_t diff;
+ ssize_t ret;
+ FILE *tmp;
+ int tmpfd;
+
+ tmp = tmpfile();
+ if (tmp == NULL) {
+ perror("tmpfile");
+ return -1;
+ }
+
+ tmpfd = fileno(tmp);
+
+ im = meta_writer_create(info->outfd, info->cmp);
+ if (im == NULL)
+ goto fail_tmp;
+
+ dm = meta_writer_create(tmpfd, info->cmp);
+ if (dm == NULL)
+ goto fail_im;
+
+ info->inode_counter = 2;
+
+ if (write_child_inodes(info, im, dm, info->fs.root))
+ goto fail;
+
+ if (write_inode(info, im, dm, info->fs.root))
+ goto fail;
+
+ if (meta_writer_flush(im))
+ goto fail;
+
+ if (meta_writer_flush(dm))
+ goto fail;
+
+ info->super.root_inode_ref = info->fs.root->inode_ref;
+
+ info->super.inode_table_start = info->super.bytes_used;
+ info->super.bytes_used += im->block_offset;
+
+ info->super.directory_table_start = info->super.bytes_used;
+ info->super.bytes_used += dm->block_offset;
+
+ if (lseek(tmpfd, 0, SEEK_SET) == (off_t)-1) {
+ perror("rewind on directory temp file");
+ goto fail;
+ }
+
+ for (;;) {
+ ret = read_retry(tmpfd, dm->data, sizeof(dm->data));
+
+ if (ret < 0) {
+ perror("read from temp file");
+ goto fail;
+ }
+ if (ret == 0)
+ break;
+
+ diff = ret;
+ ret = write_retry(info->outfd, dm->data, diff);
+
+ if (ret < 0) {
+ perror("write to image file");
+ goto fail;
+ }
+ if ((size_t)ret < diff) {
+ fputs("copying meta data to image file: "
+ "truncated write\n", stderr);
+ goto fail;
+ }
+ }
+
+ meta_writer_destroy(dm);
+ meta_writer_destroy(im);
+ fclose(tmp);
+ return 0;
+fail:
+ meta_writer_destroy(dm);
+fail_im:
+ meta_writer_destroy(im);
+fail_tmp:
+ fclose(tmp);
+ return -1;
+}
diff --git a/mkfs/mksquashfs.c b/mkfs/mksquashfs.c
index 3272dbc..7e19d49 100644
--- a/mkfs/mksquashfs.c
+++ b/mkfs/mksquashfs.c
@@ -119,6 +119,9 @@ int main(int argc, char **argv)
if (write_data_to_image(&info))
goto out_cmp;
+ if (sqfs_write_inodes(&info))
+ goto out_cmp;
+
if (sqfs_super_write(&info.super, info.outfd))
goto out_cmp;
diff --git a/mkfs/mksquashfs.h b/mkfs/mksquashfs.h
index 5522268..0ffa721 100644
--- a/mkfs/mksquashfs.h
+++ b/mkfs/mksquashfs.h
@@ -45,6 +45,7 @@ typedef struct {
size_t frag_offset;
id_table_t idtbl;
+ size_t inode_counter;
compressor_t *cmp;
} sqfs_info_t;
@@ -53,4 +54,6 @@ void process_command_line(options_t *opt, int argc, char **argv);
int write_data_to_image(sqfs_info_t *info);
+int sqfs_write_inodes(sqfs_info_t *info);
+
#endif /* MKSQUASHFS_H */
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-27 08:09:31 +0000