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[BLOCK] scsi: add FUA support to sd

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Add FUA support for barriers to SCSI disk.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Tejun Heo 2006-01-06 09:53:52 +01:00 committed by Jens Axboe
parent 461d4e90c8
commit 007365ad60
1 changed files with 26 additions and 3 deletions
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29
drivers/scsi/sd.c
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@ -102,6 +102,7 @@ struct scsi_disk {
u8 write_prot;
unsigned WCE : 1; /* state of disk WCE bit */
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
};
static DEFINE_IDR(sd_index_idr);
@ -343,6 +344,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
if (block > 0xffffffff) {
SCpnt->cmnd[0] += READ_16 - READ_6;
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
@ -362,6 +364,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
this_count = 0xffff;
SCpnt->cmnd[0] += READ_10 - READ_6;
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
@ -370,6 +373,17 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
} else {
if (unlikely(blk_fua_rq(rq))) {
/*
* This happens only if this drive failed
* 10byte rw command with ILLEGAL_REQUEST
* during operation and thus turned off
* use_10_for_rw.
*/
printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n");
return 0;
}
SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
SCpnt->cmnd[3] = (unsigned char) block & 0xff;
@ -1395,10 +1409,18 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
sdkp->RCD = 0;
}
sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
printk(KERN_NOTICE "SCSI device %s: uses "
"READ/WRITE(6), disabling FUA\n", diskname);
sdkp->DPOFUA = 0;
}
ct = sdkp->RCD + 2*sdkp->WCE;
printk(KERN_NOTICE "SCSI device %s: drive cache: %s\n",
diskname, types[ct]);
printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n",
diskname, types[ct],
sdkp->DPOFUA ? " w/ FUA" : "");
return;
}
@ -1475,7 +1497,8 @@ static int sd_revalidate_disk(struct gendisk *disk)
* QUEUE_ORDERED_TAG_* even when ordered tag is supported.
*/
if (sdkp->WCE)
ordered = QUEUE_ORDERED_DRAIN_FLUSH;
ordered = sdkp->DPOFUA
? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
else
ordered = QUEUE_ORDERED_DRAIN;