feat: symlink(2) and realpathat syscall

[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 0f8d0d56bb80e2f9aff24da6f80fb1e15910e981..bc22fd537e371c13f1c7c32e39f9256726a3c26b 100644 (file)
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -6,6 +6,7 @@
 #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
@@ -13,34 +14,40 @@
 #define VFS_INODE_TYPE_DIR 0x1
 #define VFS_INODE_TYPE_FILE 0x2
 #define VFS_INODE_TYPE_DEVICE 0x4
+#define VFS_INODE_TYPE_SYMLINK 0x8
 
-#define VFS_ETOOLONG -1
 #define VFS_ENOFS -2
 #define VFS_EBADMNT -3
-#define VFS_ENODIR -4
+
 #define VFS_EENDOFDIR -5
-#define VFS_ENOTFOUND -6
-#define VFS_ENOOPS -7
+
 #define VFS_EINVLD -8
 #define VFS_EEOF -9
 
 #define VFS_WALK_MKPARENT 0x1
 #define VFS_WALK_FSRELATIVE 0x2
-#define VFS_WALK_MKDIR 0x4
+#define VFS_WALK_PARENT 0x4
+#define VFS_WALK_NOFOLLOW 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;
 
 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);
 };
@@ -66,6 +73,7 @@ struct dir_context
     void* cb_data;
     void (*read_complete_callback)(struct dir_context* dctx,
                                    const char* name,
+                                   const int len,
                                    const int dtype);
 };
 
@@ -83,6 +91,7 @@ struct v_file_ops
 struct v_file
 {
     struct v_inode* inode;
+    struct v_dnode* dnode;
     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
@@ -93,6 +102,7 @@ struct v_fd
 {
     struct v_file* file;
     int pos;
+    int flags;
 };
 
 struct v_inode
@@ -101,15 +111,23 @@ struct v_inode
     uint32_t ctime;
     uint32_t mtime;
     uint64_t lb_addr;
-    uint32_t ref_count;
+    uint32_t open_count;
+    uint32_t link_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 (*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_file* file);
+        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);
+        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 (*symlink)(struct v_inode* this, const char* target);
+        int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode);
     } ops;
 };
 
@@ -143,6 +161,9 @@ 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);
 
@@ -153,18 +174,23 @@ 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* fs_name, bdev_t device, struct v_dnode* mnt_point);
+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(struct v_dnode* mnt_point);
+vfs_unmount_at(struct v_dnode* mnt_point);
 
 int
-vfs_mkdir(const char* parent_path,
-          const char* component,
-          struct v_dnode** dentry);
+vfs_mkdir(const char* path, struct v_dnode** dentry);
 
 int
 vfs_open(struct v_dnode* dnode, struct v_file** file);