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authorMatthew Wilcox <matthew@wil.cx>2006-09-29 01:19:20 +0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-10-11 22:44:25 +0400
commit3e082a910d217b2e7b186077ebf5a1126a68c62f (patch)
treeb4ef4152b8ad0198283e36c74c990f38d90d27b7 /include/scsi/scsi_host.h
parent53a5fbdc2dff55161a206ed1a1385a8fa8055c34 (diff)
downloadlinux-3e082a910d217b2e7b186077ebf5a1126a68c62f.tar.xz
[SCSI] Add ability to scan scsi busses asynchronously
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>
Diffstat (limited to 'include/scsi/scsi_host.h')
-rw-r--r--include/scsi/scsi_host.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 39c6f8cc20c3..ba5b3eb6b43f 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -552,6 +552,9 @@ struct Scsi_Host {
/* task mgmt function in progress */
unsigned tmf_in_progress:1;
+ /* Asynchronous scan in progress */
+ unsigned async_scan:1;
+
/*
* Optional work queue to be utilized by the transport
*/