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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Diego Domingos <diegdo@br.ibm.com>
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Date: Thu, 24 Mar 2022 13:14:42 -0400
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Subject: [PATCH] make ofdisk_retries optional
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The feature Retry on Fail added to GRUB can cause a LPM to take
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longer if the SAN is slow.
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When a LPM to external site occur, the path of the disk can change
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and thus the disk search function on grub can take some time since
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it is used as a hint. This can cause the Retry on Fail feature to
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try to access the disk 20x times (since this is hardcoded number)
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and, if the SAN is slow, the boot time can increase a lot.
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In some situations not acceptable.
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The following patch enables a configuration at user space of the
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maximum number of retries we want for this feature.
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The variable ofdisk_retries should be set using grub2-editenv
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and will be checked by retry function. If the variable is not set,
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so the default number of retries will be used instead.
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---
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include/grub/ieee1275/ofdisk.h | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/include/grub/ieee1275/ofdisk.h b/include/grub/ieee1275/ofdisk.h
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index 7d2d540930..0074d55eee 100644
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--- a/include/grub/ieee1275/ofdisk.h
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+++ b/include/grub/ieee1275/ofdisk.h
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@@ -25,7 +25,12 @@ extern void grub_ofdisk_fini (void);
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#define MAX_RETRIES 20
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-#define RETRY_IEEE1275_OFDISK_OPEN(device, last_ihandle) unsigned retry_i=0;for(retry_i=0; retry_i < MAX_RETRIES; retry_i++){ \
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+#define RETRY_IEEE1275_OFDISK_OPEN(device, last_ihandle) \
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+ unsigned max_retries = MAX_RETRIES; \
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+ if(grub_env_get("ofdisk_retries") != NULL) \
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+ max_retries = grub_strtoul(grub_env_get("ofdisk_retries"), 0, 10)+1; \
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+ grub_dprintf("ofdisk","MAX_RETRIES set to %u\n",max_retries); \
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+ unsigned retry_i=0;for(retry_i=0; retry_i < max_retries; retry_i++){ \
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if(!grub_ieee1275_open(device, last_ihandle)) \
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break; \
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grub_dprintf("ofdisk","Opening disk %s failed. Retrying...\n",device); }
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