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[PATCH] Snoop SET FEATURES - WRITE CACHE ENABLE/DISABLE command(v5) 

This patch makes libata snoop 'SET FEATURES - WRITE CACHE
ENABLE/DISABLE' command, executing requisite revalidation processes
to update cached data.

Signed-off-by: Forrest Zhao <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
zhao, forrest 2006-06-12 12:01:34 +08:00 committed by Jeff Garzik
parent 39b07ce6d9
commit 3057ac3c1a
5 changed files with 44 additions and 0 deletions
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1
drivers/scsi/libata-core.c
View File

@ -5194,6 +5194,7 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
INIT_WORK(&ap->port_task, NULL, NULL);
INIT_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
INIT_LIST_HEAD(&ap->eh_done_q);
init_waitqueue_head(&ap->eh_wait_q);

3
drivers/scsi/libata-eh.c
View File

@ -1554,6 +1554,9 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
if (rc)
break;
/* schedule the scsi_rescan_device() here */
queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
ehc->i.action &= ~ATA_EH_REVALIDATE;
} else if (dev->class == ATA_DEV_UNKNOWN &&
ehc->tries[dev->devno] &&

36
drivers/scsi/libata-scsi.c
View File

@ -1306,6 +1306,17 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
u8 *cdb = cmd->cmnd;
int need_sense = (qc->err_mask != 0);
/* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
* schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
* cache
*/
if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
((qc->tf.feature == SETFEATURES_WC_ON) ||
(qc->tf.feature == SETFEATURES_WC_OFF))) {
qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
ata_port_schedule_eh(qc->ap);
}
/* For ATA pass thru (SAT) commands, generate a sense block if
* user mandated it or if there's an error. Note that if we
* generate because the user forced us to, a check condition
@ -2992,3 +3003,28 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
return rc;
}
/**
* ata_scsi_dev_rescan - initiate scsi_rescan_device()
* @data: Pointer to ATA port to perform scsi_rescan_device()
*
* After ATA pass thru (SAT) commands are executed successfully,
* libata need to propagate the changes to SCSI layer.
*
* LOCKING:
* Kernel thread context (may sleep).
*/
void ata_scsi_dev_rescan(void *data)
{
struct ata_port *ap = data;
struct ata_device *dev;
unsigned int i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
dev = &ap->device[i];
if (ata_dev_enabled(dev))
scsi_rescan_device(&(dev->sdev->sdev_gendev));
}
}

1
drivers/scsi/libata.h
View File

@ -104,6 +104,7 @@ extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
unsigned int (*actor) (struct ata_scsi_args *args,
u8 *rbuf, unsigned int buflen));
extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
extern void ata_scsi_dev_rescan(void *data);
/* libata-eh.c */
extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);

3
include/linux/ata.h
View File

@ -181,6 +181,9 @@ enum {
XFER_PIO_0 = 0x08,
XFER_PIO_SLOW = 0x00,
SETFEATURES_WC_ON = 0x02, /* Enable write cache */
SETFEATURES_WC_OFF = 0x82, /* Disable write cache */
/* ATAPI stuff */
ATAPI_PKT_DMA = (1 << 0),
ATAPI_DMADIR = (1 << 2), /* ATAPI data dir: