linux-kernel - [PATCH 2/4] brd: Add getgeo to block ops

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Date:	Wed, 06 Aug 2014 14:30:33 +0300
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Jens Axboe <axboe@...nel.dk>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 2/4] brd: Add getgeo to block ops

From: Ross Zwisler <ross.zwisler@...ux.intel.com>

Some programs require HDIO_GETGEO work, which requires we implement
getgeo.  Based off of the work done to the NVMe driver in this commit:

4cc09e2dc4cb NVMe: Add getgeo to block ops

[Boaz] Converted original work done for prd.c for here.
       This is needed if we want to support partitions, fdisk
       calls this.

Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Boaz Harrosh <boaz@...xistor.com>
---
 drivers/block/brd.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index a10a0a9..3f07cb4 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -19,6 +19,7 @@
 #include <linux/radix-tree.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
+#include <linux/hdreg.h>
 
 #include <asm/uaccess.h>
 
@@ -424,6 +425,15 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
 	return error;
 }
 
+static int brd_getgeo(struct block_device *bd, struct hd_geometry *geo)
+{
+	/* some standard values */
+	geo->heads = 1 << 6;
+	geo->sectors = 1 << 5;
+	geo->cylinders = get_capacity(bd->bd_disk) >> 11;
+	return 0;
+}
+
 static const struct block_device_operations brd_fops = {
 	.owner =		THIS_MODULE,
 	.rw_page =		brd_rw_page,
@@ -431,6 +441,7 @@ static const struct block_device_operations brd_fops = {
 #ifdef CONFIG_BLK_DEV_XIP
 	.direct_access =	brd_direct_access,
 #endif
+	.getgeo =		brd_getgeo,
 };
 
 /*
-- 
1.9.3

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