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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Diego Domingos <diegodo@br.ibm.com>
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Date: Wed, 10 Mar 2021 14:17:52 -0500
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Subject: [PATCH] ieee1275/ofdisk: retry on open failure
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This patch aims to make grub more robust when booting from SAN/Multipath disks.
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If a path is failing intermittently so grub will retry the OPEN and READ the
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disk (grub_ieee1275_open and grub_ieee1275_read) until the total amount of times
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specified in MAX_RETRIES.
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Signed-off-by: Diego Domingos <diegodo@br.ibm.com>
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---
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grub-core/disk/ieee1275/ofdisk.c | 25 ++++++++++++++++++++-----
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include/grub/ieee1275/ofdisk.h | 8 ++++++++
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2 files changed, 28 insertions(+), 5 deletions(-)
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diff --git a/grub-core/disk/ieee1275/ofdisk.c b/grub-core/disk/ieee1275/ofdisk.c
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index f3a6ecd79..98325ca98 100644
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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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@@ -225,7 +225,9 @@ dev_iterate (const struct grub_ieee1275_devalias *alias)
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char *buf, *bufptr;
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unsigned i;
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- if (grub_ieee1275_open (alias->path, &ihandle))
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+
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+ RETRY_IEEE1275_OFDISK_OPEN(alias->path, &ihandle)
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+ if (! ihandle)
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return;
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/* This method doesn't need memory allocation for the table. Open
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@@ -305,7 +307,9 @@ dev_iterate (const struct grub_ieee1275_devalias *alias)
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return;
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}
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- if (grub_ieee1275_open (alias->path, &ihandle))
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+ RETRY_IEEE1275_OFDISK_OPEN(alias->path, &ihandle);
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+
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+ if (! ihandle)
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{
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grub_free (buf);
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grub_free (table);
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@@ -495,7 +499,7 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
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last_ihandle = 0;
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last_devpath = NULL;
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- grub_ieee1275_open (op->open_path, &last_ihandle);
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+ RETRY_IEEE1275_OFDISK_OPEN(op->open_path, &last_ihandle);
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if (! last_ihandle)
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
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last_devpath = op->open_path;
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@@ -571,7 +575,7 @@ grub_ofdisk_prepare (grub_disk_t disk, grub_disk_addr_t sector)
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last_ihandle = 0;
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last_devpath = NULL;
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- grub_ieee1275_open (disk->data, &last_ihandle);
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+ RETRY_IEEE1275_OFDISK_OPEN(disk->data, &last_ihandle);
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if (! last_ihandle)
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
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last_devpath = disk->data;
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@@ -598,12 +602,23 @@ grub_ofdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
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return err;
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grub_ieee1275_read (last_ihandle, buf, size << disk->log_sector_size,
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&actual);
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- if (actual != (grub_ssize_t) (size << disk->log_sector_size))
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+ int i = 0;
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+ while(actual != (grub_ssize_t) (size << disk->log_sector_size)){
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+ if (i>MAX_RETRIES){
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return grub_error (GRUB_ERR_READ_ERROR, N_("failure reading sector 0x%llx "
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"from `%s'"),
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(unsigned long long) sector,
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disk->name);
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+ }
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+ last_devpath = NULL;
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+ err = grub_ofdisk_prepare (disk, sector);
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+ if (err)
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+ return err;
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+ grub_ieee1275_read (last_ihandle, buf, size << disk->log_sector_size,
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+ &actual);
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+ i++;
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+ }
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return 0;
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}
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diff --git a/include/grub/ieee1275/ofdisk.h b/include/grub/ieee1275/ofdisk.h
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index 2f69e3f19..7d2d54093 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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@@ -22,4 +22,12 @@
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extern void grub_ofdisk_init (void);
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extern void grub_ofdisk_fini (void);
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+#define MAX_RETRIES 20
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+
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+
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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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+ 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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+
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#endif /* ! GRUB_INIT_HEADER */
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