refactor: mount system reworked

[lunaix-os.git] / lunaix-os / includes / lunaix / fs.h

diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h
index 8e34d811fef05df03dbb6df1a3cf2350ff53addb..e95fbaddc21edb5f66302737a0965c7660c6fd21 100644 (file)
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -1,20 +1,61 @@
 #ifndef __LUNAIX_VFS_H
 #define __LUNAIX_VFS_H
 
 #ifndef __LUNAIX_VFS_H
 #define __LUNAIX_VFS_H
 

-#include <hal/ahci/hba.h>
-#include <lunaix/block.h>
+#include <lunaix/clock.h>
+#include <lunaix/device.h>
+#include <lunaix/ds/btrie.h>

 #include <lunaix/ds/hashtable.h>
 #include <lunaix/ds/hstr.h>
 #include <lunaix/ds/llist.h>
 #include <lunaix/ds/hashtable.h>
 #include <lunaix/ds/hstr.h>
 #include <lunaix/ds/llist.h>

+#include <lunaix/ds/lru.h>
+#include <lunaix/ds/mutex.h>
+#include <lunaix/status.h>
+#include <stdatomic.h>

 
 #define VFS_NAME_MAXLEN 128
 
 #define VFS_NAME_MAXLEN 128

+#define VFS_MAX_FD 32
+
+#define VFS_IFDIR 0x1
+#define VFS_IFFILE 0x2
+#define VFS_IFSEQDEV 0x4
+#define VFS_IFVOLDEV 0x8
+#define VFS_IFSYMLINK 0x16
+
+#define VFS_WALK_MKPARENT 0x1
+#define VFS_WALK_FSRELATIVE 0x2
+#define VFS_WALK_PARENT 0x4
+#define VFS_WALK_NOFOLLOW 0x4
+
+#define VFS_HASHTABLE_BITS 10
+#define VFS_HASHTABLE_SIZE (1 << VFS_HASHTABLE_BITS)
+#define VFS_HASH_MASK (VFS_HASHTABLE_SIZE - 1)
+#define VFS_HASHBITS (32 - VFS_HASHTABLE_BITS)
+
+#define FSTYPE_ROFS 0x1
+
+#define VFS_VALID_CHAR(chr)                                                    \
+    (('A' <= (chr) && (chr) <= 'Z') || ('a' <= (chr) && (chr) <= 'z') ||       \
+     ('0' <= (chr) && (chr) <= '9') || (chr) == '.' || (chr) == '_' ||         \
+     (chr) == '-')
+
+extern struct hstr vfs_ddot;
+extern struct hstr vfs_dot;
+
+typedef uint32_t inode_t;

 
 struct v_dnode;
 
 struct v_dnode;

+struct v_inode;
+struct v_superblock;
+struct v_file;
+struct v_fd;
+struct pcache;

 
 struct filesystem
 {
     struct hlist_node fs_list;
     struct hstr fs_name;
 
 struct filesystem
 {
     struct hlist_node fs_list;
     struct hstr fs_name;

+    uint32_t types;
+    int fs_id; // can be used to detect fs type on partition

     int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
     int (*unmount)(struct v_superblock* vsb);
 };
     int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
     int (*unmount)(struct v_superblock* vsb);
 };


@@ -22,10 +63,11 @@ struct filesystem
 struct v_superblock
 {
     struct llist_header sb_list;
 struct v_superblock
 {
     struct llist_header sb_list;

-    int fs_id;
-    bdev_t dev;
+    struct device* dev;

     struct v_dnode* root;
     struct filesystem* fs;
     struct v_dnode* root;
     struct filesystem* fs;

+    uint32_t iobuf_size;
+    struct hbucket* i_cache;

     struct
     {
         uint32_t (*read_capacity)(struct v_superblock* vsb);
     struct
     {
         uint32_t (*read_capacity)(struct v_superblock* vsb);


@@ -33,48 +75,94 @@ struct v_superblock
     } ops;
 };
 
     } ops;
 };
 

+struct dir_context
+{
+    int index;
+    void* cb_data;
+    void (*read_complete_callback)(struct dir_context* dctx,
+                                   const char* name,
+                                   const int len,
+                                   const int dtype);
+};
+
+struct v_file_ops
+{
+    int (*write)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
+    int (*read)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
+    int (*readdir)(struct v_inode* inode, struct dir_context* dctx);
+    int (*seek)(struct v_inode* inode, size_t offset);
+    int (*close)(struct v_file* file);
+    int (*sync)(struct v_inode* inode);
+};
+

 struct v_file
 {
     struct v_inode* inode;
 struct v_file
 {
     struct v_inode* inode;

-    struct
-    {
-        void* data;
-        uint32_t size;
-        uint64_t lb_addr;
-        uint32_t offset;
-        int dirty;
-    } buffer;
-    struct
-    {
-        int (*write)(struct v_file* file, void* data_in, uint32_t size);
-        int (*read)(struct v_file* file, void* data_out, uint32_t size);
-        int (*readdir)(struct v_file* file, int dir_index);
-        int (*seek)(struct v_file* file, size_t offset);
-        int (*rename)(struct v_file* file, char* new_name);
-        int (*close)(struct v_file* file);
-        int (*sync)(struct v_file* file);
-    } ops;
+    struct v_dnode* dnode;
+    struct llist_header* f_list;
+    uint32_t f_pos;
+    atomic_ulong ref_count;
+    struct v_file_ops ops;
+};
+
+struct v_fd
+{
+    struct v_file* file;
+    int flags;

 };
 
 struct v_inode
 {
 };
 
 struct v_inode
 {

+    inode_t id;
+    mutex_t lock;

     uint32_t itype;
     uint32_t itype;

-    uint32_t ctime;
-    uint32_t mtime;
-    uint64_t lb_addr;
-    uint32_t ref_count;
+    time_t ctime;
+    time_t mtime;
+    time_t atime;
+    lba_t lb_addr;
+    uint32_t open_count;
+    uint32_t link_count;

     uint32_t lb_usage;
     uint32_t lb_usage;

+    uint32_t fsize;
+    struct hlist_node hash_list;
+    struct lru_node lru;
+    struct pcache* pg_cache;
+    void* data; // 允许底层FS绑定他的一些专有数据

     struct
     {
     struct
     {

-        int (*open)(struct v_inode* inode, struct v_file* file);
-        int (*sync)(struct v_inode* inode);
-        int (*mkdir)(struct v_inode* inode, struct v_dnode* dnode);
-        int (*dir_lookup)(struct v_inode* inode, struct v_dnode* dnode);
+        int (*create)(struct v_inode* this, struct v_dnode* dnode);
+        int (*open)(struct v_inode* this, struct v_file* file);
+        int (*sync)(struct v_inode* this);
+        int (*mkdir)(struct v_inode* this, struct v_dnode* dnode);
+        int (*rmdir)(struct v_inode* this, struct v_dnode* dir);
+        int (*unlink)(struct v_inode* this);
+        int (*link)(struct v_inode* this, struct v_dnode* new_name);
+        int (*read_symlink)(struct v_inode* this, const char** path_out);
+        int (*set_symlink)(struct v_inode* this, const char* target);
+        int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode);
+        int (*rename)(struct v_inode* from_inode,
+                      struct v_dnode* from_dnode,
+                      struct v_dnode* to_dnode);

     } ops;
     } ops;

+    struct v_file_ops default_fops;
+};
+
+struct v_mount
+{
+    mutex_t lock;
+    struct llist_header list;
+    struct llist_header submnts;
+    struct llist_header sibmnts;
+    struct v_mount* parent;
+    struct v_dnode* mnt_point;
+    struct v_superblock* super_block;
+    uint32_t busy_counter;

 };
 
 struct v_dnode
 {
 };
 
 struct v_dnode
 {

+    mutex_t lock; // sync the path walking
+    struct lru_node lru;

     struct hstr name;
     struct v_inode* inode;
     struct v_dnode* parent;
     struct hstr name;
     struct v_inode* inode;
     struct v_dnode* parent;


@@ -82,8 +170,37 @@ struct v_dnode
     struct llist_header children;
     struct llist_header siblings;
     struct v_superblock* super_block;
     struct llist_header children;
     struct llist_header siblings;
     struct v_superblock* super_block;

+    struct v_mount* mnt;
+    atomic_ulong ref_count;
+
+    void* data;
+};
+
+struct v_fdtable
+{
+    struct v_fd* fds[VFS_MAX_FD];
+};
+
+struct pcache
+{
+    struct v_inode* master;
+    struct btrie tree;
+    struct llist_header pages;
+    struct llist_header dirty;
+    uint32_t n_dirty;
+    uint32_t n_pages;

 };
 
 };
 

+struct pcache_pg
+{
+    struct llist_header pg_list;
+    struct llist_header dirty_list;
+    struct lru_node lru;
+    struct pcache* holder;
+    void* pg;
+    uint32_t flags;
+    uint32_t fpos;
+};

 /* --- file system manager --- */
 void
 fsm_init();
 /* --- file system manager --- */
 void
 fsm_init();


@@ -94,4 +211,127 @@ fsm_register(struct filesystem* fs);
 struct filesystem*
 fsm_get(const char* fs_name);
 
 struct filesystem*
 fsm_get(const char* fs_name);
 

+void
+vfs_init();
+
+struct v_dnode*
+vfs_dcache_lookup(struct v_dnode* parent, struct hstr* str);
+
+void
+vfs_dcache_add(struct v_dnode* parent, struct v_dnode* dnode);
+
+int
+vfs_walk(struct v_dnode* start,
+         const char* path,
+         struct v_dnode** dentry,
+         struct hstr* component,
+         int walk_options);
+
+int
+vfs_mount(const char* target, const char* fs_name, struct device* device);
+
+int
+vfs_unmount(const char* target);
+
+int
+vfs_mount_at(const char* fs_name,
+             struct device* device,
+             struct v_dnode* mnt_point);
+
+int
+vfs_unmount_at(struct v_dnode* mnt_point);
+
+int
+vfs_mkdir(const char* path, struct v_dnode** dentry);
+
+int
+vfs_open(struct v_dnode* dnode, struct v_file** file);
+
+int
+vfs_close(struct v_file* file);
+
+int
+vfs_fsync(struct v_file* file);
+
+void
+vfs_assign_inode(struct v_dnode* assign_to, struct v_inode* inode);
+
+struct v_superblock*
+vfs_sb_alloc();
+
+void
+vfs_sb_free(struct v_superblock* sb);
+
+struct v_dnode*
+vfs_d_alloc();
+
+void
+vfs_d_free(struct v_dnode* dnode);
+
+struct v_inode*
+vfs_i_alloc(struct v_superblock* sb,
+            uint32_t inode_id,
+            void (*init)(struct v_inode* inode, void* data),
+            void* data);
+
+void
+vfs_i_free(struct v_inode* inode);
+
+int
+vfs_dup_fd(struct v_fd* old, struct v_fd** new);
+
+void
+pcache_init(struct pcache* pcache);
+
+void
+pcache_release_page(struct pcache* pcache, struct pcache_pg* page);
+
+struct pcache_pg*
+pcache_new_page(struct pcache* pcache, uint32_t index);
+
+void
+pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg);
+
+struct pcache_pg*
+pcache_get_page(struct pcache* pcache,
+                uint32_t index,
+                uint32_t* offset,
+                struct pcache_pg** page);
+
+int
+pcache_write(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
+
+int
+pcache_read(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
+
+void
+pcache_release(struct pcache* pcache);
+
+int
+pcache_commit(struct v_inode* inode, struct pcache_pg* page);
+
+void
+pcache_commit_all(struct v_inode* inode);
+
+void
+pcache_invalidate(struct pcache* pcache, struct pcache_pg* page);
+
+/**
+ * @brief 将挂载点标记为繁忙
+ *
+ * @param mnt
+ */
+void
+mnt_mkbusy(struct v_mount* mnt);
+
+/**
+ * @brief 将挂载点标记为清闲
+ *
+ * @param mnt
+ */
+void
+mnt_chillax(struct v_mount* mnt);
+
+struct v_mount*
+vfs_create_mount(struct v_mount* parent, struct v_dnode* mnt_point);

 #endif /* __LUNAIX_VFS_H */
 #endif /* __LUNAIX_VFS_H */