[src/trunk]: src/sys Add helper function that determines the size and block s...

[mlelstv <mlelstv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/34ea2e0c52c9
branches:  trunk
changeset: 751255:34ea2e0c52c9
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Sat Jan 30 11:57:17 2010 +0000

description:
Add helper function that determines the size and block size of a disk device.
For now we query
- the disk label
- the wedge info and data from disk(9)

diffstat:

 sys/kern/subr_disk_open.c |  32 ++++++++++++++++++++++++++++++--
 sys/sys/device.h          |   3 ++-
 2 files changed, 32 insertions(+), 3 deletions(-)

diffs (67 lines):

diff -r d1d48266fdb7 -r 34ea2e0c52c9 sys/kern/subr_disk_open.c
--- a/sys/kern/subr_disk_open.c Sat Jan 30 08:57:49 2010 +0000
+++ b/sys/kern/subr_disk_open.c Sat Jan 30 11:57:17 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: subr_disk_open.c,v 1.1 2009/09/06 16:18:56 pooka Exp $ */
+/*     $NetBSD: subr_disk_open.c,v 1.2 2010/01/30 11:57:17 mlelstv Exp $       */
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_disk_open.c,v 1.1 2009/09/06 16:18:56 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_disk_open.c,v 1.2 2010/01/30 11:57:17 mlelstv Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -80,3 +80,31 @@
 
        return tmpvn;
 }
+
+int
+getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned *secsizep)
+{
+       struct partinfo dpart;
+       struct dkwedge_info dkw;
+       struct disk *pdk;
+       int error;
+
+       error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED);
+       if (error == 0) {
+               *secsizep = dpart.disklab->d_secsize;
+               *numsecp  = dpart.part->p_size;
+               return 0;
+       }
+
+       error = VOP_IOCTL(vp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED);
+       if (error == 0) {
+               pdk = disk_find(dkw.dkw_parent);
+               if (pdk != NULL) {
+                       *secsizep = DEV_BSIZE << pdk->dk_blkshift;
+                       *numsecp  = dkw.dkw_size;
+               } else
+                       error = ENODEV;
+       }
+
+       return error;
+}
diff -r d1d48266fdb7 -r 34ea2e0c52c9 sys/sys/device.h
--- a/sys/sys/device.h  Sat Jan 30 08:57:49 2010 +0000
+++ b/sys/sys/device.h  Sat Jan 30 11:57:17 2010 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: device.h,v 1.132 2010/01/10 20:11:50 martin Exp $ */
+/* $NetBSD: device.h,v 1.133 2010/01/30 11:57:18 mlelstv Exp $ */
 
 /*
  * Copyright (c) 1996, 2000 Christopher G. Demetriou
@@ -426,6 +426,7 @@
 extern int booted_partition;           /* or the partition on that device */
 
 struct vnode *opendisk(struct device *);
+int getdisksize(struct vnode *, uint64_t *, unsigned *);
 int config_handle_wedges(struct device *, int);
 
 void   config_init(void);