diff options
| author | Kenneth R Westerback <krw@cvs.openbsd.org> | 2010-06-30 22:53:42 +0000 |
|---|---|---|
| committer | Kenneth R Westerback <krw@cvs.openbsd.org> | 2010-06-30 22:53:42 +0000 |
| commit | 0d02b8e4c98c741e7a0efca280db1e59259e2bca (patch) | |
| tree | f3f7bdd11195bc6ff80257f381f9cfc0f4b7c12c /sbin/fdisk/mbr.c | |
| parent | 8c106c54d8ea352c3a5cde7ab58fdb7eb7231a4a (diff) | |
Make 'fdisk -i' start the OpenBSD partition on a power of 2 512-byte
block boundary. In most modern (i.e. 'faked' geometry) situations
this will start it at (0-based) block[64] rather than block[63] as
now. This should help performance on disks which really have 4K
sectors but report 512-byte sectors.
Power of 2 idea from deraadt@.
ok toby@ deraadt@
Diffstat (limited to 'sbin/fdisk/mbr.c')
| -rw-r--r-- | sbin/fdisk/mbr.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sbin/fdisk/mbr.c b/sbin/fdisk/mbr.c index 5fa12606c8e..df93b3aace2 100644 --- a/sbin/fdisk/mbr.c +++ b/sbin/fdisk/mbr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: mbr.c,v 1.24 2009/02/08 18:03:18 krw Exp $ */ +/* $OpenBSD: mbr.c,v 1.25 2010/06/30 22:53:41 krw Exp $ */ /* * Copyright (c) 1997 Tobias Weingartner @@ -48,6 +48,9 @@ void MBR_init(disk_t *disk, mbr_t *mbr) { + daddr64_t i; + int adj; + /* Fix up given mbr for this disk */ mbr->part[0].flag = 0; mbr->part[1].flag = 0; @@ -87,6 +90,16 @@ MBR_init(disk_t *disk, mbr_t *mbr) /* Fix up start/length fields */ PRT_fix_BN(disk, &mbr->part[3], 3); #endif + + /* Start OpenBSD MBR partition on a power of 2 block number. */ + i = 1; + while (i < DL_SECTOBLK(&dl, mbr->part[3].bs)) + i *= 2; + i = DL_BLKTOSEC(&dl, i); + adj = i - mbr->part[3].bs; + mbr->part[3].bs += adj; + mbr->part[3].ns -= adj; + PRT_fix_CHS(disk, &mbr->part[3]); } void |