[PATCH] dm store geometry

Allow drive geometry to be stored with a new DM_DEV_SET_GEOMETRY ioctl.
Device-mapper will now respond to HDIO_GETGEO.  If the geometry information is
not available, zero will be returned for all of the parameters.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 104 insertions, 1 deletions

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 65826bdac00..8edd6435414 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/devfs_fs_kernel.h>
 #include <linux/dm-ioctl.h>
+#include <linux/hdreg.h>
 
 #include <asm/uaccess.h>
 
@@ -700,6 +701,54 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
 	return dm_hash_rename(param->name, new_name);
 }
 
+static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
+{
+	int r = -EINVAL, x;
+	struct mapped_device *md;
+	struct hd_geometry geometry;
+	unsigned long indata[4];
+	char *geostr = (char *) param + param->data_start;
+
+	md = find_device(param);
+	if (!md)
+		return -ENXIO;
+
+	if (geostr < (char *) (param + 1) ||
+	    invalid_str(geostr, (void *) param + param_size)) {
+		DMWARN("Invalid geometry supplied.");
+		goto out;
+	}
+
+	x = sscanf(geostr, "%lu %lu %lu %lu", indata,
+		   indata + 1, indata + 2, indata + 3);
+
+	if (x != 4) {
+		DMWARN("Unable to interpret geometry settings.");
+		goto out;
+	}
+
+	if (indata[0] > 65535 || indata[1] > 255 ||
+	    indata[2] > 255 || indata[3] > ULONG_MAX) {
+		DMWARN("Geometry exceeds range limits.");
+		goto out;
+	}
+
+	geometry.cylinders = indata[0];
+	geometry.heads = indata[1];
+	geometry.sectors = indata[2];
+	geometry.start = indata[3];
+
+	r = dm_set_geometry(md, &geometry);
+	if (!r)
+		r = __dev_status(md, param);
+
+	param->data_size = 0;
+
+out:
+	dm_put(md);
+	return r;
+}
+
 static int do_suspend(struct dm_ioctl *param)
 {
 	int r = 0;
@@ -1234,7 +1283,8 @@ static ioctl_fn lookup_ioctl(unsigned int cmd)
 
 		{DM_LIST_VERSIONS_CMD, list_versions},
 
-		{DM_TARGET_MSG_CMD, target_message}
+		{DM_TARGET_MSG_CMD, target_message},
+		{DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry}
 	};
 
 	return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b99df48cffe..973e63d530a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -17,6 +17,7 @@
 #include <linux/mempool.h>
 #include <linux/slab.h>
 #include <linux/idr.h>
+#include <linux/hdreg.h>
 #include <linux/blktrace_api.h>
 
 static const char *_name = DM_NAME;
@@ -102,6 +103,9 @@ struct mapped_device {
 	 */
 	struct super_block *frozen_sb;
 	struct block_device *suspended_bdev;
+
+	/* forced geometry settings */
+	struct hd_geometry geometry;
 };
 
 #define MIN_IOS 256
@@ -227,6 +231,13 @@ static int dm_blk_close(struct inode *inode, struct file *file)
 	return 0;
 }
 
+static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct mapped_device *md = bdev->bd_disk->private_data;
+
+	return dm_get_geometry(md, geo);
+}
+
 static inline struct dm_io *alloc_io(struct mapped_device *md)
 {
 	return mempool_alloc(md->io_pool, GFP_NOIO);
@@ -313,6 +324,33 @@ struct dm_table *dm_get_table(struct mapped_device *md)
 	return t;
 }
 
+/*
+ * Get the geometry associated with a dm device
+ */
+int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo)
+{
+	*geo = md->geometry;
+
+	return 0;
+}
+
+/*
+ * Set the geometry of a device.
+ */
+int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo)
+{
+	sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors;
+
+	if (geo->start > sz) {
+		DMWARN("Start sector is beyond the geometry limits.");
+		return -EINVAL;
+	}
+
+	md->geometry = *geo;
+
+	return 0;
+}
+
 /*-----------------------------------------------------------------
  * CRUD START:
  *   A more elegant soln is in the works that uses the queue
@@ -906,6 +944,13 @@ static int __bind(struct mapped_device *md, struct dm_table *t)
 	sector_t size;
 
 	size = dm_table_get_size(t);
+
+	/*
+	 * Wipe any geometry if the size of the table changed.
+	 */
+	if (size != get_capacity(md->disk))
+		memset(&md->geometry, 0, sizeof(md->geometry));
+
 	__set_size(md, size);
 	if (size == 0)
 		return 0;
@@ -1261,6 +1306,7 @@ int dm_suspended(struct mapped_device *md)
 static struct block_device_operations dm_blk_dops = {
 	.open = dm_blk_open,
 	.release = dm_blk_close,
+	.getgeo = dm_blk_getgeo,
 	.owner = THIS_MODULE
 };
 
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 79e800051a1..fd90bc8f9e4 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -14,6 +14,7 @@
 #include <linux/device-mapper.h>
 #include <linux/list.h>
 #include <linux/blkdev.h>
+#include <linux/hdreg.h>
 
 #define DM_NAME "device-mapper"
 #define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x)
@@ -85,6 +86,12 @@ int dm_wait_event(struct mapped_device *md, int event_nr);
 struct gendisk *dm_disk(struct mapped_device *md);
 int dm_suspended(struct mapped_device *md);
 
+/*
+ * Geometry functions.
+ */
+int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
+int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
+
 /*-----------------------------------------------------------------
  * Functions for manipulating a table.  Tables are also reference
  * counted.