4 #include <lunaix/clock.h>
5 #include <lunaix/device.h>
6 #include <lunaix/ds/btrie.h>
7 #include <lunaix/ds/hashtable.h>
8 #include <lunaix/ds/hstr.h>
9 #include <lunaix/ds/llist.h>
10 #include <lunaix/ds/lru.h>
11 #include <lunaix/ds/mutex.h>
12 #include <lunaix/status.h>
13 #include <stdatomic.h>
15 #define VFS_NAME_MAXLEN 128
19 #define VFS_IFFILE 0x2
20 #define VFS_IFSEQDEV 0x4
21 #define VFS_IFVOLDEV 0x8
22 #define VFS_IFSYMLINK 0x16
24 #define VFS_WALK_MKPARENT 0x1
25 #define VFS_WALK_FSRELATIVE 0x2
26 #define VFS_WALK_PARENT 0x4
27 #define VFS_WALK_NOFOLLOW 0x4
29 #define VFS_HASHTABLE_BITS 10
30 #define VFS_HASHTABLE_SIZE (1 << VFS_HASHTABLE_BITS)
31 #define VFS_HASH_MASK (VFS_HASHTABLE_SIZE - 1)
32 #define VFS_HASHBITS (32 - VFS_HASHTABLE_BITS)
34 #define FSTYPE_ROFS 0x1
36 #define VFS_VALID_CHAR(chr) \
37 (('A' <= (chr) && (chr) <= 'Z') || ('a' <= (chr) && (chr) <= 'z') || \
38 ('0' <= (chr) && (chr) <= '9') || (chr) == '.' || (chr) == '_' || \
41 extern struct hstr vfs_ddot;
42 extern struct hstr vfs_dot;
44 typedef uint32_t inode_t;
55 struct hlist_node fs_list;
58 int fs_id; // can be used to detect fs type on partition
59 int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
60 int (*unmount)(struct v_superblock* vsb);
65 struct llist_header sb_list;
68 struct filesystem* fs;
70 struct hbucket* i_cache;
73 uint32_t (*read_capacity)(struct v_superblock* vsb);
74 uint32_t (*read_usage)(struct v_superblock* vsb);
82 void (*read_complete_callback)(struct dir_context* dctx,
90 int (*write)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
91 int (*read)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
92 int (*readdir)(struct v_inode* inode, struct dir_context* dctx);
93 int (*seek)(struct v_inode* inode, size_t offset);
94 int (*close)(struct v_file* file);
95 int (*sync)(struct v_inode* inode);
100 struct v_inode* inode;
101 struct v_dnode* dnode;
102 struct llist_header* f_list;
104 atomic_ulong ref_count;
105 struct v_file_ops ops;
127 struct hlist_node hash_list;
129 struct pcache* pg_cache;
130 void* data; // 允许底层FS绑定他的一些专有数据
133 int (*create)(struct v_inode* this, struct v_dnode* dnode);
134 int (*open)(struct v_inode* this, struct v_file* file);
135 int (*sync)(struct v_inode* this);
136 int (*mkdir)(struct v_inode* this, struct v_dnode* dnode);
137 int (*rmdir)(struct v_inode* this, struct v_dnode* dir);
138 int (*unlink)(struct v_inode* this);
139 int (*link)(struct v_inode* this, struct v_dnode* new_name);
140 int (*read_symlink)(struct v_inode* this, const char** path_out);
141 int (*set_symlink)(struct v_inode* this, const char* target);
142 int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode);
143 int (*rename)(struct v_inode* from_inode,
144 struct v_dnode* from_dnode,
145 struct v_dnode* to_dnode);
147 struct v_file_ops default_fops;
153 struct llist_header list;
154 struct llist_header submnts;
155 struct llist_header sibmnts;
156 struct v_mount* parent;
157 struct v_dnode* mnt_point;
158 struct v_superblock* super_block;
159 uint32_t busy_counter;
164 mutex_t lock; // sync the path walking
167 struct v_inode* inode;
168 struct v_dnode* parent;
169 struct hlist_node hash_list;
170 struct llist_header children;
171 struct llist_header siblings;
172 struct v_superblock* super_block;
174 atomic_ulong ref_count;
181 struct v_fd* fds[VFS_MAX_FD];
186 struct v_inode* master;
188 struct llist_header pages;
189 struct llist_header dirty;
196 struct llist_header pg_list;
197 struct llist_header dirty_list;
199 struct pcache* holder;
204 /* --- file system manager --- */
209 fsm_register(struct filesystem* fs);
212 fsm_get(const char* fs_name);
218 vfs_dcache_lookup(struct v_dnode* parent, struct hstr* str);
221 vfs_dcache_add(struct v_dnode* parent, struct v_dnode* dnode);
224 vfs_walk(struct v_dnode* start,
226 struct v_dnode** dentry,
227 struct hstr* component,
231 vfs_mount(const char* target, const char* fs_name, struct device* device);
234 vfs_unmount(const char* target);
237 vfs_mount_at(const char* fs_name,
238 struct device* device,
239 struct v_dnode* mnt_point);
242 vfs_unmount_at(struct v_dnode* mnt_point);
245 vfs_mkdir(const char* path, struct v_dnode** dentry);
248 vfs_open(struct v_dnode* dnode, struct v_file** file);
251 vfs_close(struct v_file* file);
254 vfs_fsync(struct v_file* file);
257 vfs_assign_inode(struct v_dnode* assign_to, struct v_inode* inode);
263 vfs_sb_free(struct v_superblock* sb);
269 vfs_d_free(struct v_dnode* dnode);
272 vfs_i_alloc(struct v_superblock* sb,
274 void (*init)(struct v_inode* inode, void* data),
278 vfs_i_free(struct v_inode* inode);
281 vfs_dup_fd(struct v_fd* old, struct v_fd** new);
284 pcache_init(struct pcache* pcache);
287 pcache_release_page(struct pcache* pcache, struct pcache_pg* page);
290 pcache_new_page(struct pcache* pcache, uint32_t index);
293 pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg);
296 pcache_get_page(struct pcache* pcache,
299 struct pcache_pg** page);
302 pcache_write(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
305 pcache_read(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
308 pcache_release(struct pcache* pcache);
311 pcache_commit(struct v_inode* inode, struct pcache_pg* page);
314 pcache_commit_all(struct v_inode* inode);
317 pcache_invalidate(struct pcache* pcache, struct pcache_pg* page);
325 mnt_mkbusy(struct v_mount* mnt);
333 mnt_chillax(struct v_mount* mnt);
336 vfs_create_mount(struct v_mount* parent, struct v_dnode* mnt_point);
337 #endif /* __LUNAIX_VFS_H */