[PATCH] SYNCHRONIZE_CACHE on umount

[Hifumi Hisashi <hifumi.hisashi@xxxxxxxxxxxxx>]

Hi.
When a SCSI HDD(WCE bit is set) is umounted, SYNCHRONIZE_CACHE(35h)
command is not issued under current sd driver.

When an IDE HDD is umounted, FLUSH CACHE is issued through
idedisk_release().
I suppose that the sd driver also needs to flush cache through umount.

Thanks.

Signed-off-by: Hifumi Hisashi <hifumi.hisashi@xxxxxxxxxxxxx>

--- linux-2.6.15/drivers/scsi/sd.c      2006-01-12 16:23:44.000000000 +0900
+++ linux-2.6.15_fix/drivers/scsi/sd.c  2006-01-12 16:43:04.000000000 +0900
@@ -503,6 +503,8 @@

        SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name));

+       if (sdkp->WCE)
+               sd_sync_cache(sdev);
        if (!--sdkp->openers && sdev->removable) {
                if (scsi_block_when_processing_errors(sdev))
                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);

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