link to mfs.h

filesystems-distributed/README.md

@@ -17,7 +17,7 @@ representation of your data structures; you should use these system calls
 to access it: `open(), read(), write(), lseek(), close(), fsync().`
 
 To access the file server, you will be building a client library. The
-interface that the library supports is defined in XXX MFS.H XXX.  The
+interface that the library supports is defined in [mfs.h](mfs.h).  The
 library should be called `libmfs.so`, and any programs that wish to access
 your file server will link with it and call its various routines.
 

filesystems-distributed/mfs.h

@@ -0,0 +1,71 @@
+#ifndef __MFS_h__
+#define __MFS_h__
+
+#define MFS_DIRECTORY    (0)
+#define MFS_REGULAR_FILE (1)
+#define BUFFER_SIZE (4096)
+#define MFS_BLOCK_SIZE   (4096)
+#define DIR_NAME_LENGTH (28)
+#define NUM_INODES (4096)
+
+#define INIT (0)
+#define LOOKUP (1)
+#define STAT (2)
+#define WRITE (3)
+#define READ (4)
+#define CREATEF (5)
+#define CREATED (6)
+#define UNLINK (7)
+#define SHUTDOWN (8) 
+
+
+typedef struct __MFS_Stat_t {
+    int type;   // MFS_DIRECTORY or MFS_REGULAR
+    int size;   // bytes
+    // note: no permissions, access times, etc.
+} MFS_Stat_t;
+
+typedef struct __MFS_DirEnt_t {
+    char name[28];  // up to 28 bytes of name in directory (including \0)
+    int  inum;      // inode number of entry (-1 means entry not used)
+} MFS_DirEnt_t;
+
+typedef struct __request{
+  int action;                              //The action requested from the server
+  int inum;                                //inode number of file to be acted on
+  int pinum;                               //inode number of parent directory--used when creating files
+  int block;                               //Block to be read
+  int port;                                //portname to connect to server on
+  char buf[MFS_BLOCK_SIZE];                //Multiple meanings, depending on the action requested
+}request;
+
+typedef struct __reply{
+  int inum;
+  MFS_Stat_t m;
+  int rc;
+  char read_data[MFS_BLOCK_SIZE];
+}reply;
+typedef struct checkpoint{
+  int endptr;
+  int mapptrs[256];
+}checkpoint;
+
+
+typedef struct inode{
+  int size;
+  int type;
+  int ptrs[14];
+
+}inode;
+
+
+
+int MFS_Init(char *hostname, int port);
+int MFS_Lookup(int pinum, char *name);
+int MFS_Stat(int inum, MFS_Stat_t *m);
+int MFS_Write(int inum, char *buffer, int block);
+int MFS_Read(int inum, char *buffer, int block);
+int MFS_Creat(int pinum, int type, char *name);
+int MFS_Unlink(int pinum, char *name);
+int MFS_Shutdown(void);
+#endif // __MFS_h__