fs/ioctl: add BLKSSZGET cmd to get block sector size

refer to:
https://sites.uclouvain.be/SystInfo/usr/include/sys/mount.h.html

Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>

fs/vfs/fs_ioctl.c

@@ -110,6 +110,20 @@ int file_vioctl(FAR struct file *filep, int req, va_list ap)
             ret = inode_getpath(inode, (FAR char *)(uintptr_t)arg);
           }
         break;
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+      case BIOC_BLKSSZGET:
+        if (inode->u.i_ops != NULL && inode->u.i_ops->ioctl != NULL)
+          {
+            struct geometry geo;
+            ret = inode->u.i_ops->ioctl(filep, BIOC_GEOMETRY,
+                                        (unsigned long)(uintptr_t)&geo);
+            if (ret >= 0)
+              {
+                *(FAR blksize_t *)(uintptr_t)arg = geo.geo_sectorsize;
+              }
+          }
+#endif
     }
 
   return ret;

include/nuttx/fs/ioctl.h

@@ -287,6 +287,12 @@
                                            * OUT: Partition information structure
                                            *      populated with data from the block
                                            *      device partition */
+#define BIOC_BLKSSZGET  _BIOC(0x000f)     /* Get block device sector size.
+                                           * IN:  Pointer to writable instance
+                                           *      of sector size in which
+                                           *      to return sector size.
+                                           * OUT: Data return in user-provided
+                                           *      buffer. */
 
 /* NuttX MTD driver ioctl definitions ***************************************/
 

include/sys/mount.h

@@ -26,11 +26,14 @@
  ****************************************************************************/
 
 #include <nuttx/compiler.h>
+#include <nuttx/fs/ioctl.h>
 
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
 
+#define BLKSSZGET BIOC_BLKSSZGET
+
 /* Mount flags */
 
 #define MS_RDONLY 1 /* Mount file system read-only */