1  #ifndef FS_H
 2  #define FS_H
 3  
 4  #include "types.h"
 5  
 6  // Simple filesystem node
 7  struct fs_node {
 8      char name[128];     // Filename
 9      uint32_t mask;      // Permissions mask
10      uint32_t uid;       // Owning user
11      uint32_t gid;       // Owning group
12      uint32_t flags;     // Node type flags
13      uint32_t inode;     // Device-specific
14      uint32_t length;    // Size of file
15      uint32_t impl;      // Implementation-defined
16      
17      // Function pointers for operations
18      uint32_t (*read)(struct fs_node*, uint32_t, uint32_t, uint8_t*);
19      uint32_t (*write)(struct fs_node*, uint32_t, uint32_t, uint8_t*);
20      void (*open)(struct fs_node*);
21      void (*close)(struct fs_node*);
22      struct dirent* (*readdir)(struct fs_node*, uint32_t);
23      struct fs_node* (*finddir)(struct fs_node*, char*);
24      
25      struct fs_node* ptr; // Used by mountpoints and symlinks
26  };
27  
28  // Directory entry
29  struct dirent {
30      char name[128];
31      uint32_t ino;
32  };
33  
34  // Filesystem flags
35  #define FS_FILE        0x01
36  #define FS_DIRECTORY   0x02
37  #define FS_CHARDEVICE  0x03
38  #define FS_BLOCKDEVICE 0x04
39  #define FS_PIPE        0x05
40  #define FS_SYMLINK     0x06
41  #define FS_MOUNTPOINT  0x08
42  
43  // Filesystem operations
44  uint32_t fs_read(struct fs_node* node, uint32_t offset, uint32_t size, uint8_t* buffer);
45  uint32_t fs_write(struct fs_node* node, uint32_t offset, uint32_t size, uint8_t* buffer);
46  void fs_open(struct fs_node* node, uint8_t read, uint8_t write);
47  void fs_close(struct fs_node* node);
48  struct dirent* fs_readdir(struct fs_node* node, uint32_t index);
49  struct fs_node* fs_finddir(struct fs_node* node, char* name);
50  
51  // Root filesystem
52  extern struct fs_node* fs_root;
53  
54  // Initialize filesystem
55  void fs_init(void);
56  
57  #endif // FS_H