feat: simple device abstraction layer

[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..fe9b39b6ea2cdff27de62b585c18a4bccf82a38c 100644 (file)
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -6,8 +6,38 @@
 #include <lunaix/ds/hashtable.h>
 #include <lunaix/ds/hstr.h>
 #include <lunaix/ds/llist.h>
+#include <lunaix/status.h>
 
 #define VFS_NAME_MAXLEN 128
+#define VFS_MAX_FD 32
+
+#define VFS_INODE_TYPE_DIR 0x1
+#define VFS_INODE_TYPE_FILE 0x2
+#define VFS_INODE_TYPE_DEVICE 0x4
+
+#define VFS_ENOFS -2
+#define VFS_EBADMNT -3
+
+#define VFS_EENDOFDIR -5
+
+#define VFS_EINVLD -8
+#define VFS_EEOF -9
+
+#define VFS_WALK_MKPARENT 0x1
+#define VFS_WALK_FSRELATIVE 0x2
+#define VFS_WALK_PARENT 0x4
+
+#define VFS_IOBUF_FDIRTY 0x1
+
+#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;
 
 struct v_dnode;
 
@@ -15,6 +45,7 @@ struct filesystem
 {
     struct hlist_node fs_list;
     struct hstr fs_name;
+    uint32_t types;
     int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
     int (*unmount)(struct v_superblock* vsb);
 };
@@ -26,6 +57,7 @@ struct v_superblock
     bdev_t dev;
     struct v_dnode* root;
     struct filesystem* fs;
+    uint32_t iobuf_size;
     struct
     {
         uint32_t (*read_capacity)(struct v_superblock* vsb);
@@ -33,27 +65,40 @@ struct v_superblock
     } 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_file* file, void* buffer, size_t len);
+    int (*read)(struct v_file* file, void* buffer, size_t len);
+    int (*readdir)(struct v_file* file, struct dir_context* dctx);
+    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);
+};
+
 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 llist_header* f_list;
+    uint32_t f_pos;
+    void* data; // 允许底层FS绑定他的一些专有数据
+    struct v_file_ops ops;
+};
+
+struct v_fd
+{
+    struct v_file* file;
+    int pos;
 };
 
 struct v_inode
@@ -64,8 +109,11 @@ struct v_inode
     uint64_t lb_addr;
     uint32_t ref_count;
     uint32_t lb_usage;
+    uint32_t fsize;
+    void* data; // 允许底层FS绑定他的一些专有数据
     struct
     {
+        int (*create)(struct v_inode* inode, struct v_file* file);
         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);
@@ -82,6 +130,15 @@ struct v_dnode
     struct llist_header children;
     struct llist_header siblings;
     struct v_superblock* super_block;
+    struct
+    {
+        void (*destruct)(struct v_dnode* dnode);
+    } ops;
+};
+
+struct v_fdtable
+{
+    struct v_fd* fds[VFS_MAX_FD];
 };
 
 /* --- file system manager --- */
@@ -94,4 +151,61 @@ fsm_register(struct filesystem* fs);
 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, bdev_t device);
+
+int
+vfs_unmount(const char* target);
+
+int
+vfs_mount_at(const char* fs_name, bdev_t 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);
+
+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();
+
+void
+vfs_i_free(struct v_inode* inode);
 #endif /* __LUNAIX_VFS_H */