Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | Re: [PATCH linux-2.6-block:master 05/10] blk: add FUA support to SCSI disk | Date | Wed, 27 Jul 2005 00:46:16 +0900 (KST) |
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05_blk_scsi-add-fua-support.patch
Add FUA support to SCSI disk.
Signed-off-by: Tejun Heo <htejun@gmail.com>
sd.c | 29 ++++++++++++++++++++++++++--- 1 files changed, 26 insertions(+), 3 deletions(-)
Index: blk-fixes/drivers/scsi/sd.c =================================================================== --- blk-fixes.orig/drivers/scsi/sd.c 2005-07-27 00:44:51.000000000 +0900 +++ blk-fixes/drivers/scsi/sd.c 2005-07-27 00:44:51.000000000 +0900 @@ -103,6 +103,7 @@ 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_c 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_c 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_c 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; + } + if (this_count > 0xff) this_count = 0xff; @@ -1399,10 +1413,18 @@ sd_read_cache_type(struct scsi_disk *sdk 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; } @@ -1489,7 +1511,8 @@ static int sd_revalidate_disk(struct gen * 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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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