Add FTL logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2307 42af7a65-404d-4744-a932-0658087f49c3

include/nuttx/mtd.h

@@ -71,7 +71,7 @@ struct mtd_geometry_s
   uint16 blocksize;     /* Size of one read/write block */
   uint16 erasesize;     /* Size of one erase blocks -- must be a multiple
                          * of blocksize. */
-  size_t neraseblocks; /* Number of erase blocks */
+  size_t neraseblocks;  /* Number of erase blocks */
 };
 
 /* This structure defines the interface to a simple memory technology device.
@@ -83,7 +83,7 @@ struct mtd_dev_s
 {
   /* The following methods operate on the MTD: */
 
-  /* Erase the specified erase blocks */
+  /* Erase the specified erase blocks (units are erase blocks) */
 
   int (*erase)(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks);
 

include/nuttx/rwbuffer.h

@@ -106,7 +106,7 @@ struct rwbuffer_s
 
   uint16        blocksize;       /* The size of one block */
   size_t        nblocks;         /* The total number blocks supported */
-  void         *dev;             /* Device state passed to callout functions */
+  FAR void     *dev;             /* Device state passed to callout functions */
 
   /* Write buffer setup.  If CONFIG_FS_WRITEBUFFER is defined, but you
    * want read-ahead-only operation, (1) set wrmaxblocks to zero and do