MyriadFs is starting out...but the FUSE system is...akward at best.

5 files changed, 127 insertions, 6 deletions

diff --git a/src/file.cpp b/src/file.cpp
index 0566ee8..008b88e 100644
--- a/src/file.cpp
+++ b/src/file.cpp
@@ -11,7 +11,6 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include <stdlib.h> // for mkstemp
 #include <time.h>
 
 #include "bu/config.h"
diff --git a/src/myriad.h b/src/myriad.h
index 79c3cda..ed0ef53 100644
--- a/src/myriad.h
+++ b/src/myriad.h
@@ -46,7 +46,7 @@ namespace Bu
          * Header format is as follows:
          *
          * MMMMvBssssSSSS*
-         * M = Magic number (FFC399BD)
+         * M = Magic number (0AD3FA84)
          * v = version number
          * B = Bits per int
          * s = Blocksize in bytes
diff --git a/src/myriadfs.cpp b/src/myriadfs.cpp
index bb72cd5..af60c08 100644
--- a/src/myriadfs.cpp
+++ b/src/myriadfs.cpp
@@ -1,7 +1,75 @@
-#include "myriadfs.h"
+#include "bu/myriadfs.h"
+#include "bu/myriadstream.h"
 
-Bu::MyriadFs::MyriadFs()
+#include <string.h>
+#include <unistd.h>
+
+namespace Bu { subExceptionDef( MyriadFsException ) }
+
+#define Myriad_Fs_MAGIC_CODE            ((char *)"\xa7\x18\x8b\x39")
+
+Bu::MyriadFs::MyriadFs( Bu::Stream &rStore, int iBlockSize ) :
+        rStore( rStore ),
+        mStore( rStore, iBlockSize )
 {
+        if( mStore.hasStream( 1 ) )
+        {
+                // Check to see if this is a MyriadFs stream.
+                Bu::MyriadStream ms = mStore.openStream( 1 );
+                char sMagic[4];
+                if( ms.read( sMagic, 4 ) < 4 )
+                        throw MyriadFsException("The provided stream does not appear to be "
+                                "a MyriadFs stream.");
+                if( ::strncmp( sMagic, Myriad_Fs_MAGIC_CODE, 4 ) )
+                        throw MyriadFsException("The provided stream does not appear to be "
+                                "a MyriadFs stream.");
+        
+                int8_t iVer;
+        }
+        else
+        {
+                // Create initial header stream
+                {
+                        mStore.createStream( 1 );
+                        Bu::MyriadStream ms = mStore.openStream( 1 );
+                        ms.write( Myriad_Fs_MAGIC_CODE, 4 );
+                        int8_t iVer = 1;
+                        int32_t iTmp = 1;
+                        ms.write( &iVer, 1 );
+                        ms.write( &iBlockSize, 4 );
+                        ms.write( &iTmp, 4 ); // iNumNodes
+                        iTmp = 0;
+                        ms.write( &iTmp, 4 ); // iInode
+                        ms.write( &iTmp, 0 ); // iPosition
+                }
+
+                // Create initial inode stream, with one root node.
+                {
+                        mStore.createStream( 2 );
+                        Bu::MyriadStream ms = mStore.openStream( 2 );
+                        int32_t iUser = 0, iGroup = 0;
+#ifndef WIN32
+                        iUser = getuid();
+                        iGroup = getgid();
+#endif
+                        int32_t iTmp32 = 0;
+                        int16_t iTmp16 = 0;
+                        ms.write( &iUser, 4 );
+                        ms.write( &iGroup, 4 );
+                        ms.write( &iTmp16, 2 );
+                        ms.write( &iTmp16, 2 );
+                        iTmp32 = 3;
+                        ms.write( &iTmp32, 4 );
+                        iTmp32 = 0;
+                        ms.write( &iTmp32, 4 );
+                        ms.write( &iTmp16, 2 ); 
+                }
+
+                // Create inode 0's storage stream.
+                {
+                        mStore.createStream( 3 );
+                }
+        }
 }
 
 Bu::MyriadFs::~MyriadFs()
diff --git a/src/myriadfs.h b/src/myriadfs.h
index 687584b..42a3493 100644
--- a/src/myriadfs.h
+++ b/src/myriadfs.h
@@ -1,13 +1,20 @@
 #ifndef MYRIAD_FS_H
 #define MYRIAD_FS_H
 
+#include "bu/myriad.h"
+
 namespace Bu
 {
+        class Stream;
+
+        subExceptionDecl( MyriadFsException );
+
         /**
          * A POSIX compliant, node based filesystem built on top of Myriad.
          *
+         * A header is placed into stream 1.
          * Header format:
-         *   int32_t iMagicHeader
+         *   int32_t iMagicHeader  (A7188B39)
          *   int8_t iVersion (1)
          *   int32_t iNodeSize
          *   int32_t iNumNodes
@@ -17,6 +24,11 @@ namespace Bu
          *   int32_t iInode
          *   int32_t iPosition
          *
+         * The node headers or inode structures have a base size of 22 bytes.
+         * Everything else in the block is used for the name.  I.e. if you have
+         * a blocksize of 512 bytes then you wind up with a max name size of
+         * 512-22=490 characters, or a blocksize of 256 gives you 234 chraacters
+         * as a max.  The node headers are all stored in stream 2.
          * Basic node header format:
          *   int32_t iUser
          *   int32_t iGroup
@@ -30,8 +42,12 @@ namespace Bu
         class MyriadFs
         {
         public:
-                MyriadFs();
+                MyriadFs( Bu::Stream &rStore, int iBlockSize=512 );
                 virtual ~MyriadFs();
+
+        private:
+                Bu::Stream &rStore;
+                Bu::Myriad mStore;
         };
 };
 
diff --git a/src/tools/myriadfs.cpp b/src/tools/myriadfs.cpp
new file mode 100644
index 0000000..66955a5
--- /dev/null
+++ b/src/tools/myriadfs.cpp
@@ -0,0 +1,38 @@
+#define FUSE_USE_VERSION 26
+
+#include <fuse.h>
+
+#include <string.h>
+
+extern "C" {
+        static int myriadfs_getattr( const char *sPath, struct stat *stbuf )
+        {
+
+        }
+
+        static int myriadfs_readdir( const char *sPath, void *buf,
+                        fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi )
+        {
+        }
+
+        static int myriadfs_open( const char *sPath, struct fuse_file_info *fi )
+        {
+        }
+
+        static int myriadfs_read( const char *sPath, char *buf, size_t iSize,
+                        off_t iOffset, struct fuse_file_info *fi )
+        {
+        }
+
+        static struct fuse_operations myriadfs_oper;
+
+        int main( int argc, char *argv[] )
+        {
+                memset( &myriadfs_oper, sizeof(myriadfs_oper), 0 );
+                myriadfs_oper.getattr    = myriadfs_getattr;
+                myriadfs_oper.readdir    = myriadfs_readdir;
+                myriadfs_oper.open       = myriadfs_open;
+                myriadfs_oper.read       = myriadfs_read;
+                return fuse_main( argc, argv, &myriadfs_oper, NULL );
+        }
+}