3e082a910d
Since it often takes around 20-30 seconds to scan a scsi bus, it's highly advantageous to do this in parallel with other things. The bulk of this patch is ensuring that devices don't change numbering, and that all devices are discovered prior to trying to start init. For those who build SCSI as modules, there's a new scsi_wait_scan module that will ensure all bus scans are finished. This patch only handles drivers which call scsi_scan_host. Fibre Channel, SAS, SATA, USB and Firewire all need additional work. Signed-off-by: Matthew Wilcox <matthew@wil.cx> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
32 lines
753 B
C
32 lines
753 B
C
/*
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* scsi_wait_scan.c
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*
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* Copyright (C) 2006 James Bottomley <James.Bottomley@SteelEye.com>
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*
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* This is a simple module to wait until all the async scans are
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* complete. The idea is to use it in initrd/initramfs scripts. You
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* modprobe it after all the modprobes of the root SCSI drivers and it
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* will wait until they have all finished scanning their busses before
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* allowing the boot to proceed
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*/
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#include <linux/module.h>
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#include "scsi_priv.h"
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static int __init wait_scan_init(void)
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{
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scsi_complete_async_scans();
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return 0;
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}
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static void __exit wait_scan_exit(void)
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{
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}
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MODULE_DESCRIPTION("SCSI wait for scans");
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MODULE_AUTHOR("James Bottomley");
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MODULE_LICENSE("GPL");
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late_initcall(wait_scan_init);
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module_exit(wait_scan_exit);
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