[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>
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 65826bd..8edd643 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 @@
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 @@
{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;