static int get_filesystems(const char *filename, char ***filesystems, const char *pattern)
{
int rc = 0;
FILE *f;
char line[128];
f = fopen(filename, "r");
if (!f)
return 1;
DBG(UTILS, mnt_debug("reading filesystems list from: %s", filename));
while (fgets(line, sizeof(line), f)) {
char name[sizeof(line)];
if (*line == '#' || strncmp(line, "nodev", 5) == 0)
continue;
if (sscanf(line, " %128[^\n ]\n", name) != 1)
continue;
if (strcmp(name, "*") == 0) {
rc = 1;
break; /* end of the /etc/filesystems */
}
if (pattern && !mnt_match_fstype(name, pattern))
continue;
rc = add_filesystem(filesystems, name);
if (rc)
break;
}
fclose(f);
return rc;
}
// 初始化VFS目录树
static void init_mount_tree(struct vfsmount *mount)
{
// 添加根文件系统
add_filesystem(&fs_ramfs);
INIT_LIST_HEAD(&(fs_ramfs.fs_supers));
// 获取根文件系统的超级块结构
struct super_block *sb = alloc_super_block();
bzero(sb, sizeof(struct super_block));
// 将 super_block 添加到文件系统控制信息下
list_add(&(sb->s_list), &(fs_ramfs.fs_supers));
// 为根文件系统初始化超级块
fs_ramfs.read_super(sb);
// 初始化根结点 inode
struct inode *inode = alloc_inode();
bzero(inode, sizeof(struct inode));
inode->i_sb = sb;
// 初始化根结点 dentry
struct dentry *dentry = alloc_dentry();
atomic_set(&(dentry->d_count), 0);
INIT_LIST_HEAD(&(dentry->d_subdirs));
INIT_LIST_HEAD(&(dentry->d_child));
dentry->d_status = 1;
dentry->d_parent = NULL;
dentry->d_sb = sb;
dentry->d_inode = inode;
dentry->is_mounted = 0;
strcpy(dentry->d_name, "/");
// 链接根节点 dentry
sb->s_root = dentry;
mount->mnt_devname = "RAM";
mount->mnt_sb = sb;
mount->mnt_root = dentry;
mount->mnt_mountpoint = dentry;
mount->mnt_parent = NULL;
}
