1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* ramfs/super.cc — RamFS superblock: mount, fill_super, and init
*/
#include <lume/fs.h>
#include <lume/dcache.h>
#include <lume/file.h>
#include <lume/mount.h>
#include <lume/slab.h>
#include <lume/kprintf.h>
#include <lume/errno.h>
#include <lume/fs_types.h>
extern inode* ramfs_get_inode(super_block* sb, const inode* dir,
uint32 mode, uint32 rdev);
/* Superblock allocation helper (defined in super.cc) */
extern super_block* alloc_super(file_system_type* type);
/* ================================================================== */
/* ramfs super_operations */
/* ================================================================== */
static inode* ramfs_alloc_inode(super_block* sb)
{
return new inode{};
}
static void ramfs_destroy_inode(inode* ip)
{
/* Free ramfs_file_data if any */
if (ip->i_private) {
struct ramfs_file_data {
char* buf;
uint64 capacity;
};
auto* data = static_cast<ramfs_file_data*>(ip->i_private);
delete[] data->buf;
delete data;
}
delete ip;
}
static int ramfs_statfs(dentry* de, kstatfs* buf)
{
/* Simple fake values */
buf->f_type = 0x858458f6; /* RAMFS_MAGIC */
buf->f_bsize = 4096;
buf->f_blocks = 0;
buf->f_bfree = 0;
buf->f_bavail = 0;
buf->f_files = 0;
buf->f_ffree = 0;
buf->f_namelen = 255;
buf->f_frsize = 4096;
buf->f_flags = 0;
return 0;
}
static super_operations ramfs_sops;
static void ramfs_sops_init()
{
ramfs_sops.alloc_inode = ramfs_alloc_inode;
ramfs_sops.destroy_inode = ramfs_destroy_inode;
ramfs_sops.free_inode = nullptr;
ramfs_sops.dirty_inode = nullptr;
ramfs_sops.write_inode = nullptr;
ramfs_sops.drop_inode = nullptr;
ramfs_sops.evict_inode = nullptr;
ramfs_sops.put_super = nullptr;
ramfs_sops.sync_fs = nullptr;
ramfs_sops.statfs = ramfs_statfs;
ramfs_sops.umount_begin = nullptr;
}
/* ================================================================== */
/* ramfs_fill_super */
/* ================================================================== */
static int ramfs_fill_super(super_block* sb, void* data, int silent)
{
sb->s_op = &ramfs_sops;
sb->s_magic = 0x858458f6;
sb->s_blocksize = 4096;
sb->s_blocksize_bits = 12;
sb->s_maxbytes = 0x7FFFFFFFFFFFFFFFLL;
sb->s_time_gran = 1;
/* Create root inode */
inode* root_ip = ramfs_get_inode(sb, nullptr, S_IFDIR | 0755, 0);
if (!root_ip) return -ENOMEM;
/* Create root dentry */
sb->s_root = d_make_root(root_ip);
if (!sb->s_root)
return -ENOMEM;
return 0;
}
/* ================================================================== */
/* ramfs_mount */
/* ================================================================== */
static super_block* ramfs_mount(file_system_type* type, int flags,
const char* dev_name, void* data)
{
super_block* sb = alloc_super(type);
if (!sb) return nullptr;
int err = ramfs_fill_super(sb, data, flags & SB_SILENT);
if (err) {
delete sb;
return nullptr;
}
return sb;
}
static void ramfs_kill_sb(super_block* sb)
{
/* Phase 1: no cleanup needed for ramfs */
(void)sb;
}
/* ================================================================== */
/* Filesystem type registration */
/* ================================================================== */
static file_system_type ramfs_fs_type;
extern void ramfs_file_ops_init();
extern void ramfs_dir_inode_ops_init();
void ramfs_init()
{
/* Runtime init to avoid un-relocated absolute pointers in .data */
ramfs_sops_init();
ramfs_file_ops_init();
ramfs_dir_inode_ops_init();
ramfs_fs_type.name = "ramfs";
ramfs_fs_type.fs_flags = FS_NO_DEVICE;
ramfs_fs_type.mount = ramfs_mount;
ramfs_fs_type.kill_sb = ramfs_kill_sb;
list_init(&ramfs_fs_type.fs_list);
register_filesystem(&ramfs_fs_type);
}
|
