59 lines
2.0 KiB
Diff
59 lines
2.0 KiB
Diff
From b0f9dcabe96e5689ecfba9b6abcd27e685eabd48 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Wed, 11 May 2022 09:56:11 -0400
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Subject: [PATCH] ofdisk: improve boot time by lookup boot disk first
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While booting lvm, grub will try to build up logical volumes via hooks
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to disk iteration where on-disk metadata can be read and parsed. However
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the process can become very slow on multipath as reachable disks are
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duplicated by multiple I/O paths and they all get inspected.
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Fortunately grub allows lvm to be lazy binding and opportunistic that
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root volume can be created when it's needed using a smaller set of
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discovered disks. The disk iteration can also be controlled by pull
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methods to only returning specified disks. That said we may be able to
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take advantage of existing design to cause less overhead in lvm
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construction.
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This patch will return boot disks in OpenFirmware so they can be used
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first. If lvm managed to create root volume out of those boot disks then
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it is all very nice as they are readily available. Otherwise disk
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scanning will be performed to present all discoverable disks to grub as
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what it was done in the past. The result maybe again time consuming but
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we have nothing to lose here.
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Signed-off-by: Michael Chang <mchang@suse.com>
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---
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grub-core/disk/ieee1275/ofdisk.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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--- a/grub-core/disk/ieee1275/ofdisk.c
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+++ b/grub-core/disk/ieee1275/ofdisk.c
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@@ -491,10 +491,11 @@
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{
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unsigned i;
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- if (pull != GRUB_DISK_PULL_NONE)
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+ if (pull > GRUB_DISK_PULL_REMOVABLE)
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return 0;
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- scan ();
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+ if (pull == GRUB_DISK_PULL_REMOVABLE)
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+ scan ();
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for (i = 0; i < ARRAY_SIZE (ofdisk_hash); i++)
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{
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@@ -532,6 +533,12 @@
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if (!ent->is_boot && ent->is_removable)
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continue;
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+ if (pull == GRUB_DISK_PULL_NONE && !ent->is_boot)
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+ continue;
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+
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+ if (pull == GRUB_DISK_PULL_REMOVABLE && ent->is_boot)
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+ continue;
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+
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if (hook (ent->grub_shortest, hook_data))
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return 1;
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}
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