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raid: make RAID autodetect default a KConfig option

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RAID autodetect has the side effect of requiring synchronisation
of all device drivers, which can make the boot several seconds longer
(I've measured 7 on one of my laptops).... even for systems that don't
have RAID setup for the root filesystem (the only FS where this matters).

This patch makes the default for autodetect a config option; either way
the user can always override via the kernel command line.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Arjan van de Ven
2008-09-21 15:44:32 -07:00
parent 82cbc11a41
commit a364092a41
2 changed files with 23 additions and 2 deletions
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14
drivers/md/Kconfig
View File

@@ -30,6 +30,20 @@ config BLK_DEV_MD
If unsure, say N. If unsure, say N.
config MD_AUTODETECT
bool "Autodetect RAID arrays during kernel boot"
depends on BLK_DEV_MD
default y
---help---
If you say Y here, then the kernel will try to autodetect raid
arrays as part of its boot process.
If you don't use raid and say Y, this autodetection can cause
a several-second delay in the boot time due to various
synchronisation steps that are part of this step.
If unsure, say Y.
config MD_LINEAR config MD_LINEAR
tristate "Linear (append) mode" tristate "Linear (append) mode"
depends on BLK_DEV_MD depends on BLK_DEV_MD

11
init/do_mounts_md.c
View File

@@ -12,7 +12,12 @@
* The code for that is here. * The code for that is here.
*/ */
static int __initdata raid_noautodetect, raid_autopart; #ifdef CONFIG_MD_AUTODETECT
static int __initdata raid_noautodetect;
#else
static int __initdata raid_noautodetect=1;
#endif
static int __initdata raid_autopart;
static struct { static struct {
int minor; int minor;
@@ -252,6 +257,8 @@ static int __init raid_setup(char *str)
if (!strncmp(str, "noautodetect", wlen)) if (!strncmp(str, "noautodetect", wlen))
raid_noautodetect = 1; raid_noautodetect = 1;
if (!strncmp(str, "autodetect", wlen))
raid_noautodetect = 0;
if (strncmp(str, "partitionable", wlen)==0) if (strncmp(str, "partitionable", wlen)==0)
raid_autopart = 1; raid_autopart = 1;
if (strncmp(str, "part", wlen)==0) if (strncmp(str, "part", wlen)==0)
@@ -288,7 +295,7 @@ void __init md_run_setup(void)
create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
if (raid_noautodetect) if (raid_noautodetect)
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n"); printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
else else
autodetect_raid(); autodetect_raid();
md_setup_drive(); md_setup_drive();