On 07/15/2014 09:34 PM, Mikulas Patocka wrote: > This is Martin Petersen's xcopy patch > (https://git.kernel.org/cgit/linux/kernel/git/mkp/linux.git/commit/?h=xcopy&id=0bdeed274e16b3038a851552188512071974eea8) > with some bug fixes, ported to the current kernel. > > This patch makes it possible to use the SCSI XCOPY command. > > We create a bio that has REQ_COPY flag in bi_rw and a bi_copy structure > that defines the source device. The target device is defined in the > bi_bdev and bi_iter.bi_sector. > > There is a new BLKCOPY ioctl that makes it possible to use XCOPY from > userspace. The ioctl argument is a pointer to an array of four uint64_t > values. > > The first value is a source byte offset, the second value is a destination > byte offset, the third value is byte length. The forth value is written by > the kernel and it represents the number of bytes that the kernel actually > copied. > > Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> > Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > > --- > Documentation/ABI/testing/sysfs-block | 9 + > block/bio.c | 2 > block/blk-core.c | 5 > block/blk-lib.c | 95 ++++++++++++ > block/blk-merge.c | 7 > block/blk-settings.c | 13 + > block/blk-sysfs.c | 10 + > block/compat_ioctl.c | 1 > block/ioctl.c | 49 ++++++ > drivers/scsi/scsi.c | 57 +++++++ > drivers/scsi/sd.c | 263 +++++++++++++++++++++++++++++++++- > drivers/scsi/sd.h | 4 > include/linux/bio.h | 9 - > include/linux/blk_types.h | 15 + > include/linux/blkdev.h | 15 + > include/scsi/scsi_device.h | 3 > include/uapi/linux/fs.h | 1 > 17 files changed, 545 insertions(+), 13 deletions(-) > > Index: linux-3.16-rc5/Documentation/ABI/testing/sysfs-block > =================================================================== > --- linux-3.16-rc5.orig/Documentation/ABI/testing/sysfs-block 2014-07-14 15:17:07.000000000 +0200 > +++ linux-3.16-rc5/Documentation/ABI/testing/sysfs-block 2014-07-14 16:26:44.000000000 +0200 > @@ -220,3 +220,12 @@ Description: > write_same_max_bytes is 0, write same is not supported > by the device. > > + > +What: /sys/block/<disk>/queue/copy_max_bytes > +Date: January 2014 > +Contact: Martin K. Petersen <martin.petersen@xxxxxxxxxx> > +Description: > + Devices that support copy offloading will set this value > + to indicate the maximum buffer size in bytes that can be > + copied in one operation. If the copy_max_bytes is 0 the > + device does not support copy offload. > Index: linux-3.16-rc5/block/blk-core.c > =================================================================== > --- linux-3.16-rc5.orig/block/blk-core.c 2014-07-14 16:26:22.000000000 +0200 > +++ linux-3.16-rc5/block/blk-core.c 2014-07-14 16:26:44.000000000 +0200 > @@ -1831,6 +1831,11 @@ generic_make_request_checks(struct bio * > goto end_io; > } > > + if (bio->bi_rw & REQ_COPY && !bdev_copy_offload(bio->bi_bdev)) { > + err = -EOPNOTSUPP; > + goto end_io; > + } > + > /* > * Various block parts want %current->io_context and lazy ioc > * allocation ends up trading a lot of pain for a small amount of > Index: linux-3.16-rc5/block/blk-lib.c > =================================================================== > --- linux-3.16-rc5.orig/block/blk-lib.c 2014-07-14 16:26:40.000000000 +0200 > +++ linux-3.16-rc5/block/blk-lib.c 2014-07-14 16:32:21.000000000 +0200 > @@ -304,3 +304,98 @@ int blkdev_issue_zeroout(struct block_de > return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask); > } > EXPORT_SYMBOL(blkdev_issue_zeroout); > + > +/** > + * blkdev_issue_copy - queue a copy same operation > + * @src_bdev: source blockdev > + * @src_sector: source sector > + * @dst_bdev: destination blockdev > + * @dst_sector: destination sector > + * @nr_sects: number of sectors to copy > + * @gfp_mask: memory allocation flags (for bio_alloc) > + * > + * Description: > + * Copy a block range from source device to target device. > + */ > +int blkdev_issue_copy(struct block_device *src_bdev, sector_t src_sector, > + struct block_device *dst_bdev, sector_t dst_sector, > + unsigned int nr_sects, gfp_t gfp_mask) > +{ > + DECLARE_COMPLETION_ONSTACK(wait); > + struct request_queue *sq = bdev_get_queue(src_bdev); > + struct request_queue *dq = bdev_get_queue(dst_bdev); > + unsigned int max_copy_sectors; > + struct bio_batch bb; > + int ret = 0; > + > + if (!sq || !dq) > + return -ENXIO; > + > + max_copy_sectors = min(sq->limits.max_copy_sectors, > + dq->limits.max_copy_sectors); > + > + if (max_copy_sectors == 0) > + return -EOPNOTSUPP; > + > + if (src_sector + nr_sects < src_sector || > + dst_sector + nr_sects < dst_sector) > + return -EINVAL; Hi Mikulas, this^ is meant as an overflow test or what is the reason? Thanks, Tomas > + > + /* Do not support overlapping copies */ > + if (src_bdev == dst_bdev && > + abs64((u64)dst_sector - (u64)src_sector) < nr_sects) > + return -EOPNOTSUPP; > + > + atomic_set(&bb.done, 1); > + bb.error = 0; > + bb.wait = &wait; > + > + while (nr_sects) { > + struct bio *bio; > + struct bio_copy *bc; > + unsigned int chunk; > + > + bc = kmalloc(sizeof(struct bio_copy), gfp_mask); > + if (!bc) { > + ret = -ENOMEM; > + break; > + } > + > + bio = bio_alloc(gfp_mask, 1); > + if (!bio) { > + kfree(bc); > + ret = -ENOMEM; > + break; > + } > + > + chunk = min(nr_sects, max_copy_sectors); > + > + bio->bi_iter.bi_sector = dst_sector; > + bio->bi_iter.bi_size = chunk << 9; > + bio->bi_end_io = bio_batch_end_io; > + bio->bi_bdev = dst_bdev; > + bio->bi_private = &bb; > + bio->bi_copy = bc; > + > + bc->bic_bdev = src_bdev; > + bc->bic_sector = src_sector; > + > + atomic_inc(&bb.done); > + submit_bio(REQ_WRITE | REQ_COPY, bio); > + > + src_sector += chunk; > + dst_sector += chunk; > + nr_sects -= chunk; > + } > + > + /* Wait for bios in-flight */ > + if (!atomic_dec_and_test(&bb.done)) > + wait_for_completion_io(&wait); > + > + if (likely(!ret)) > + ret = bb.error; > + > + return ret; > +} > +EXPORT_SYMBOL(blkdev_issue_copy); > + > Index: linux-3.16-rc5/block/blk-merge.c > =================================================================== > --- linux-3.16-rc5.orig/block/blk-merge.c 2014-07-14 15:17:07.000000000 +0200 > +++ linux-3.16-rc5/block/blk-merge.c 2014-07-14 16:26:44.000000000 +0200 > @@ -25,10 +25,7 @@ static unsigned int __blk_recalc_rq_segm > * This should probably be returning 0, but blk_add_request_payload() > * (Christoph!!!!) > */ > - if (bio->bi_rw & REQ_DISCARD) > - return 1; > - > - if (bio->bi_rw & REQ_WRITE_SAME) > + if (bio->bi_rw & (REQ_DISCARD | REQ_WRITE_SAME | REQ_COPY)) > return 1; > > fbio = bio; > @@ -196,7 +193,7 @@ static int __blk_bios_map_sg(struct requ > nsegs = 0; > cluster = blk_queue_cluster(q); > > - if (bio->bi_rw & REQ_DISCARD) { > + if (bio->bi_rw & (REQ_DISCARD | REQ_COPY)) { > /* > * This is a hack - drivers should be neither modifying the > * biovec, nor relying on bi_vcnt - but because of > Index: linux-3.16-rc5/block/blk-settings.c > =================================================================== > --- linux-3.16-rc5.orig/block/blk-settings.c 2014-07-14 15:17:08.000000000 +0200 > +++ linux-3.16-rc5/block/blk-settings.c 2014-07-14 16:26:44.000000000 +0200 > @@ -115,6 +115,7 @@ void blk_set_default_limits(struct queue > lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; > lim->chunk_sectors = 0; > lim->max_write_same_sectors = 0; > + lim->max_copy_sectors = 0; > lim->max_discard_sectors = 0; > lim->discard_granularity = 0; > lim->discard_alignment = 0; > @@ -322,6 +323,18 @@ void blk_queue_max_write_same_sectors(st > EXPORT_SYMBOL(blk_queue_max_write_same_sectors); > > /** > + * blk_queue_max_copy_sectors - set max sectors for a single copy operation > + * @q: the request queue for the device > + * @max_copy_sectors: maximum number of sectors per copy operation > + **/ > +void blk_queue_max_copy_sectors(struct request_queue *q, > + unsigned int max_copy_sectors) > +{ > + q->limits.max_copy_sectors = max_copy_sectors; > +} > +EXPORT_SYMBOL(blk_queue_max_copy_sectors); > + > +/** > * blk_queue_max_segments - set max hw segments for a request for this queue > * @q: the request queue for the device > * @max_segments: max number of segments > Index: linux-3.16-rc5/block/blk-sysfs.c > =================================================================== > --- linux-3.16-rc5.orig/block/blk-sysfs.c 2014-07-14 15:17:08.000000000 +0200 > +++ linux-3.16-rc5/block/blk-sysfs.c 2014-07-14 16:26:44.000000000 +0200 > @@ -161,6 +161,11 @@ static ssize_t queue_write_same_max_show > (unsigned long long)q->limits.max_write_same_sectors << 9); > } > > +static ssize_t queue_copy_max_show(struct request_queue *q, char *page) > +{ > + return sprintf(page, "%llu\n", > + (unsigned long long)q->limits.max_copy_sectors << 9); > +} > > static ssize_t > queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) > @@ -374,6 +379,10 @@ static struct queue_sysfs_entry queue_wr > .show = queue_write_same_max_show, > }; > > +static struct queue_sysfs_entry queue_copy_max_entry = { > + .attr = {.name = "copy_max_bytes", .mode = S_IRUGO }, > + .show = queue_copy_max_show, > +}; > static struct queue_sysfs_entry queue_nonrot_entry = { > .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, > .show = queue_show_nonrot, > @@ -422,6 +431,7 @@ static struct attribute *default_attrs[] > &queue_discard_max_entry.attr, > &queue_discard_zeroes_data_entry.attr, > &queue_write_same_max_entry.attr, > + &queue_copy_max_entry.attr, > &queue_nonrot_entry.attr, > &queue_nomerges_entry.attr, > &queue_rq_affinity_entry.attr, > Index: linux-3.16-rc5/block/ioctl.c > =================================================================== > --- linux-3.16-rc5.orig/block/ioctl.c 2014-07-14 15:17:08.000000000 +0200 > +++ linux-3.16-rc5/block/ioctl.c 2014-07-14 16:26:44.000000000 +0200 > @@ -201,6 +201,31 @@ static int blk_ioctl_zeroout(struct bloc > return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL); > } > > +static int blk_ioctl_copy(struct block_device *bdev, uint64_t src_offset, > + uint64_t dst_offset, uint64_t len) > +{ > + if (src_offset & 511) > + return -EINVAL; > + if (dst_offset & 511) > + return -EINVAL; > + if (len & 511) > + return -EINVAL; > + src_offset >>= 9; > + dst_offset >>= 9; > + len >>= 9; > + > + if (unlikely(src_offset + len < src_offset) || > + unlikely(src_offset + len > (i_size_read(bdev->bd_inode) >> 9))) > + return -EINVAL; > + > + if (unlikely(dst_offset + len < dst_offset) || > + unlikely(dst_offset + len > (i_size_read(bdev->bd_inode) >> 9))) > + return -EINVAL; > + > + return blkdev_issue_copy(bdev, src_offset, bdev, dst_offset, len, > + GFP_KERNEL); > +} > + > static int put_ushort(unsigned long arg, unsigned short val) > { > return put_user(val, (unsigned short __user *)arg); > @@ -328,6 +353,30 @@ int blkdev_ioctl(struct block_device *bd > return blk_ioctl_zeroout(bdev, range[0], range[1]); > } > > + case BLKCOPY: { > + uint64_t range[4]; > + > + range[3] = 0; > + > + if (copy_to_user((void __user *)(arg + 24), &range[3], 8)) > + return -EFAULT; > + > + if (!(mode & FMODE_WRITE)) > + return -EBADF; > + > + if (copy_from_user(range, (void __user *)arg, 24)) > + return -EFAULT; > + > + ret = blk_ioctl_copy(bdev, range[0], range[1], range[2]); > + if (!ret) { > + range[3] = range[2]; > + if (copy_to_user((void __user *)(arg + 24), &range[3], 8)) > + return -EFAULT; > + } > + > + return ret; > + } > + > case HDIO_GETGEO: { > struct hd_geometry geo; > > Index: linux-3.16-rc5/drivers/scsi/scsi.c > =================================================================== > --- linux-3.16-rc5.orig/drivers/scsi/scsi.c 2014-07-14 15:17:08.000000000 +0200 > +++ linux-3.16-rc5/drivers/scsi/scsi.c 2014-07-14 16:26:44.000000000 +0200 > @@ -1024,6 +1024,62 @@ int scsi_get_vpd_page(struct scsi_device > EXPORT_SYMBOL_GPL(scsi_get_vpd_page); > > /** > + * scsi_lookup_naa - Lookup NAA descriptor in VPD page 0x83 > + * @sdev: The device to ask > + * > + * Copy offloading requires us to know the NAA descriptor for both > + * source and target device. This descriptor is mandatory in the Device > + * Identification VPD page. Locate this descriptor in the returned VPD > + * data so we don't have to do lookups for every copy command. > + */ > +static void scsi_lookup_naa(struct scsi_device *sdev) > +{ > + unsigned char *buf = sdev->vpd_pg83; > + unsigned int len = sdev->vpd_pg83_len; > + > + if (buf[1] != 0x83 || get_unaligned_be16(&buf[2]) == 0) { > + sdev_printk(KERN_ERR, sdev, > + "%s: VPD page 0x83 contains no descriptors\n", > + __func__); > + return; > + } > + > + buf += 4; > + len -= 4; > + > + do { > + unsigned int desig_len = buf[3] + 4; > + > + /* Binary code set */ > + if ((buf[0] & 0xf) != 1) > + goto skip; > + > + /* Target association */ > + if ((buf[1] >> 4) & 0x3) > + goto skip; > + > + /* NAA designator */ > + if ((buf[1] & 0xf) != 0x3) > + goto skip; > + > + sdev->naa = buf; > + sdev->naa_len = desig_len; > + > + return; > + > + skip: > + buf += desig_len; > + len -= desig_len; > + > + } while (len > 0); > + > + sdev_printk(KERN_ERR, sdev, > + "%s: VPD page 0x83 NAA descriptor not found\n", __func__); > + > + return; > +} > + > +/** > * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure > * @sdev: The device to ask > * > @@ -1107,6 +1163,7 @@ retry_pg83: > } > sdev->vpd_pg83_len = result; > sdev->vpd_pg83 = vpd_buf; > + scsi_lookup_naa(sdev); > } > } > > Index: linux-3.16-rc5/drivers/scsi/sd.c > =================================================================== > --- linux-3.16-rc5.orig/drivers/scsi/sd.c 2014-07-14 16:26:22.000000000 +0200 > +++ linux-3.16-rc5/drivers/scsi/sd.c 2014-07-14 16:26:44.000000000 +0200 > @@ -100,6 +100,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); > > static void sd_config_discard(struct scsi_disk *, unsigned int); > static void sd_config_write_same(struct scsi_disk *); > +static void sd_config_copy(struct scsi_disk *); > static int sd_revalidate_disk(struct gendisk *); > static void sd_unlock_native_capacity(struct gendisk *disk); > static int sd_probe(struct device *); > @@ -463,6 +464,48 @@ max_write_same_blocks_store(struct devic > } > static DEVICE_ATTR_RW(max_write_same_blocks); > > +static ssize_t > +max_copy_blocks_show(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + struct scsi_disk *sdkp = to_scsi_disk(dev); > + > + return snprintf(buf, 20, "%u\n", sdkp->max_copy_blocks); > +} > + > +static ssize_t > +max_copy_blocks_store(struct device *dev, struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct scsi_disk *sdkp = to_scsi_disk(dev); > + struct scsi_device *sdp = sdkp->device; > + unsigned long max; > + int err; > + > + if (!capable(CAP_SYS_ADMIN)) > + return -EACCES; > + > + if (sdp->type != TYPE_DISK) > + return -EINVAL; > + > + err = kstrtoul(buf, 10, &max); > + > + if (err) > + return err; > + > + if (max == 0) > + sdp->no_copy = 1; > + else if (max <= SD_MAX_COPY_BLOCKS) { > + sdp->no_copy = 0; > + sdkp->max_copy_blocks = max; > + } > + > + sd_config_copy(sdkp); > + > + return count; > +} > +static DEVICE_ATTR_RW(max_copy_blocks); > + > static struct attribute *sd_disk_attrs[] = { > &dev_attr_cache_type.attr, > &dev_attr_FUA.attr, > @@ -474,6 +517,7 @@ static struct attribute *sd_disk_attrs[] > &dev_attr_thin_provisioning.attr, > &dev_attr_provisioning_mode.attr, > &dev_attr_max_write_same_blocks.attr, > + &dev_attr_max_copy_blocks.attr, > &dev_attr_max_medium_access_timeouts.attr, > NULL, > }; > @@ -830,6 +874,109 @@ static int sd_setup_write_same_cmnd(stru > return ret; > } > > +static void sd_config_copy(struct scsi_disk *sdkp) > +{ > + struct request_queue *q = sdkp->disk->queue; > + unsigned int logical_block_size = sdkp->device->sector_size; > + > + if (sdkp->device->no_copy) > + sdkp->max_copy_blocks = 0; > + > + /* Segment descriptor 0x02 has a 64k block limit */ > + sdkp->max_copy_blocks = min(sdkp->max_copy_blocks, > + (u32)SD_MAX_CSD2_BLOCKS); > + > + blk_queue_max_copy_sectors(q, sdkp->max_copy_blocks * > + (logical_block_size >> 9)); > +} > + > +static int sd_setup_copy_cmnd(struct scsi_device *sdp, struct request *rq) > +{ > + struct scsi_device *src_sdp, *dst_sdp; > + struct gendisk *src_disk; > + struct request_queue *src_queue, *dst_queue; > + sector_t src_lba, dst_lba; > + unsigned int nr_blocks, buf_len, nr_bytes = blk_rq_bytes(rq); > + int ret; > + struct bio *bio = rq->bio; > + struct page *page; > + unsigned char *buf; > + > + if (!bio->bi_copy) > + return BLKPREP_KILL; > + > + dst_sdp = scsi_disk(rq->rq_disk)->device; > + dst_queue = rq->rq_disk->queue; > + src_disk = bio->bi_copy->bic_bdev->bd_disk; > + src_queue = src_disk->queue; > + if (!src_queue || > + src_queue->make_request_fn != blk_queue_bio || > + src_queue->request_fn != dst_queue->request_fn || > + *(struct scsi_driver **)rq->rq_disk->private_data != > + *(struct scsi_driver **)src_disk->private_data) > + return BLKPREP_KILL; > + src_sdp = scsi_disk(src_disk)->device; > + > + if (src_sdp->no_copy || dst_sdp->no_copy) > + return BLKPREP_KILL; > + > + if (src_sdp->sector_size != dst_sdp->sector_size) > + return BLKPREP_KILL; > + > + dst_lba = blk_rq_pos(rq) >> (ilog2(dst_sdp->sector_size) - 9); > + src_lba = bio->bi_copy->bic_sector >> (ilog2(src_sdp->sector_size) - 9); > + nr_blocks = blk_rq_sectors(rq) >> (ilog2(dst_sdp->sector_size) - 9); > + > + page = alloc_page(GFP_ATOMIC | __GFP_ZERO); > + if (!page) > + return BLKPREP_DEFER; > + > + buf = page_address(page); > + > + /* Extended Copy (LID1) Parameter List (16 bytes) */ > + buf[0] = 0; /* LID */ > + buf[1] = 3 << 3; /* LID usage 11b */ > + put_unaligned_be16(32 + 32, &buf[2]); /* 32 bytes per E4 desc. */ > + put_unaligned_be32(28, &buf[8]); /* 28 bytes per B2B desc. */ > + buf += 16; > + > + /* Source CSCD (32 bytes) */ > + buf[0] = 0xe4; /* Identification desc. */ > + memcpy(&buf[4], src_sdp->naa, src_sdp->naa_len); > + buf += 32; > + > + /* Destination CSCD (32 bytes) */ > + buf[0] = 0xe4; /* Identification desc. */ > + memcpy(&buf[4], dst_sdp->naa, dst_sdp->naa_len); > + buf += 32; > + > + /* Segment descriptor (28 bytes) */ > + buf[0] = 0x02; /* Block to block desc. */ > + put_unaligned_be16(0x18, &buf[2]); /* Descriptor length */ > + put_unaligned_be16(0, &buf[4]); /* Source is desc. 0 */ > + put_unaligned_be16(1, &buf[6]); /* Dest. is desc. 1 */ > + put_unaligned_be16(nr_blocks, &buf[10]); > + put_unaligned_be64(src_lba, &buf[12]); > + put_unaligned_be64(dst_lba, &buf[20]); > + > + /* CDB */ > + memset(rq->cmd, 0, rq->cmd_len); > + rq->cmd[0] = EXTENDED_COPY; > + rq->cmd[1] = 0; /* LID1 */ > + buf_len = 16 + 32 + 32 + 28; > + put_unaligned_be32(buf_len, &rq->cmd[10]); > + rq->timeout = SD_COPY_TIMEOUT; > + > + rq->completion_data = page; > + blk_add_request_payload(rq, page, buf_len); > + ret = scsi_setup_blk_pc_cmnd(sdp, rq); > + rq->__data_len = nr_bytes; > + > + if (ret != BLKPREP_OK) > + __free_page(page); > + return ret; > +} > + > static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) > { > rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER; > @@ -844,7 +991,7 @@ static void sd_uninit_command(struct scs > { > struct request *rq = SCpnt->request; > > - if (rq->cmd_flags & REQ_DISCARD) > + if (rq->cmd_flags & (REQ_DISCARD | REQ_COPY)) > __free_page(rq->completion_data); > > if (SCpnt->cmnd != rq->cmd) { > @@ -876,6 +1023,9 @@ static int sd_init_command(struct scsi_c > } else if (rq->cmd_flags & REQ_WRITE_SAME) { > ret = sd_setup_write_same_cmnd(sdp, rq); > goto out; > + } else if (rq->cmd_flags & REQ_COPY) { > + ret = sd_setup_copy_cmnd(sdp, rq); > + goto out; > } else if (rq->cmd_flags & REQ_FLUSH) { > ret = scsi_setup_flush_cmnd(sdp, rq); > goto out; > @@ -1649,7 +1799,8 @@ static int sd_done(struct scsi_cmnd *SCp > unsigned char op = SCpnt->cmnd[0]; > unsigned char unmap = SCpnt->cmnd[1] & 8; > > - if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { > + if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME || > + req->cmd_flags & REQ_COPY) { > if (!result) { > good_bytes = blk_rq_bytes(req); > scsi_set_resid(SCpnt, 0); > @@ -1708,6 +1859,14 @@ static int sd_done(struct scsi_cmnd *SCp > /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ > if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { > switch (op) { > + case EXTENDED_COPY: > + sdkp->device->no_copy = 1; > + sd_config_copy(sdkp); > + > + good_bytes = 0; > + req->__data_len = blk_rq_bytes(req); > + req->cmd_flags |= REQ_QUIET; > + break; > case UNMAP: > sd_config_discard(sdkp, SD_LBP_DISABLE); > break; > @@ -2681,6 +2840,105 @@ static void sd_read_write_same(struct sc > sdkp->ws10 = 1; > } > > +static void sd_read_copy_operations(struct scsi_disk *sdkp, > + unsigned char *buffer) > +{ > + struct scsi_device *sdev = sdkp->device; > + struct scsi_sense_hdr sshdr; > + unsigned char cdb[16]; > + unsigned int result, len, i; > + bool b2b_desc = false, id_desc = false; > + > + if (sdev->naa_len == 0) > + return; > + > + /* Verify that the device has 3PC set in INQUIRY response */ > + if (sdev->inquiry_len < 6 || (sdev->inquiry[5] & (1 << 3)) == 0) > + return; > + > + /* Receive Copy Operation Parameters */ > + memset(cdb, 0, 16); > + cdb[0] = RECEIVE_COPY_RESULTS; > + cdb[1] = 0x3; > + put_unaligned_be32(SD_BUF_SIZE, &cdb[10]); > + > + memset(buffer, 0, SD_BUF_SIZE); > + result = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, > + buffer, SD_BUF_SIZE, &sshdr, > + SD_TIMEOUT, SD_MAX_RETRIES, NULL); > + > + if (!scsi_status_is_good(result)) { > + sd_printk(KERN_ERR, sdkp, > + "%s: Receive Copy Operating Parameters failed\n", > + __func__); > + return; > + } > + > + /* The RCOP response is a minimum of 44 bytes long. First 4 > + * bytes contain the length of the remaining buffer, i.e. 40+ > + * bytes. Trailing the defined fields is a list of supported > + * descriptors. We need at least 2 descriptors to drive the > + * target, hence 42. > + */ > + len = get_unaligned_be32(&buffer[0]); > + if (len < 42) { > + sd_printk(KERN_ERR, sdkp, "%s: result too short (%u)\n", > + __func__, len); > + return; > + } > + > + if ((buffer[4] & 1) == 0) { > + sd_printk(KERN_ERR, sdkp, "%s: does not support SNLID\n", > + __func__); > + return; > + } > + > + if (get_unaligned_be16(&buffer[8]) < 2) { > + sd_printk(KERN_ERR, sdkp, > + "%s: Need 2 or more CSCD descriptors\n", __func__); > + return; > + } > + > + if (get_unaligned_be16(&buffer[10]) < 1) { > + sd_printk(KERN_ERR, sdkp, > + "%s: Need 1 or more segment descriptor\n", __func__); > + return; > + } > + > + if (len - 40 != buffer[43]) { > + sd_printk(KERN_ERR, sdkp, > + "%s: Buffer len and descriptor count mismatch " \ > + "(%u vs. %u)\n", __func__, len - 40, buffer[43]); > + return; > + } > + > + for (i = 44 ; i < len + 4 ; i++) { > + if (buffer[i] == 0x02) > + b2b_desc = true; > + > + if (buffer[i] == 0xe4) > + id_desc = true; > + } > + > + if (!b2b_desc) { > + sd_printk(KERN_ERR, sdkp, > + "%s: No block 2 block descriptor (0x02)\n", > + __func__); > + return; > + } > + > + if (!id_desc) { > + sd_printk(KERN_ERR, sdkp, > + "%s: No identification descriptor (0xE4)\n", > + __func__); > + return; > + } > + > + sdkp->max_copy_blocks = get_unaligned_be32(&buffer[16]) > + >> ilog2(sdev->sector_size); > + sd_config_copy(sdkp); > +} > + > static int sd_try_extended_inquiry(struct scsi_device *sdp) > { > /* > @@ -2741,6 +2999,7 @@ static int sd_revalidate_disk(struct gen > sd_read_cache_type(sdkp, buffer); > sd_read_app_tag_own(sdkp, buffer); > sd_read_write_same(sdkp, buffer); > + sd_read_copy_operations(sdkp, buffer); > } > > sdkp->first_scan = 0; > Index: linux-3.16-rc5/drivers/scsi/sd.h > =================================================================== > --- linux-3.16-rc5.orig/drivers/scsi/sd.h 2014-07-14 15:17:08.000000000 +0200 > +++ linux-3.16-rc5/drivers/scsi/sd.h 2014-07-14 16:26:44.000000000 +0200 > @@ -19,6 +19,7 @@ > */ > #define SD_FLUSH_TIMEOUT_MULTIPLIER 2 > #define SD_WRITE_SAME_TIMEOUT (120 * HZ) > +#define SD_COPY_TIMEOUT (120 * HZ) > > /* > * Number of allowed retries > @@ -46,6 +47,8 @@ enum { > enum { > SD_MAX_WS10_BLOCKS = 0xffff, > SD_MAX_WS16_BLOCKS = 0x7fffff, > + SD_MAX_CSD2_BLOCKS = 0xffff, > + SD_MAX_COPY_BLOCKS = 0xffffffff, > }; > > enum { > @@ -66,6 +69,7 @@ struct scsi_disk { > sector_t capacity; /* size in 512-byte sectors */ > u32 max_ws_blocks; > u32 max_unmap_blocks; > + u32 max_copy_blocks; > u32 unmap_granularity; > u32 unmap_alignment; > u32 index; > Index: linux-3.16-rc5/include/linux/bio.h > =================================================================== > --- linux-3.16-rc5.orig/include/linux/bio.h 2014-07-14 15:17:09.000000000 +0200 > +++ linux-3.16-rc5/include/linux/bio.h 2014-07-14 16:26:44.000000000 +0200 > @@ -106,7 +106,7 @@ static inline bool bio_has_data(struct b > { > if (bio && > bio->bi_iter.bi_size && > - !(bio->bi_rw & REQ_DISCARD)) > + !(bio->bi_rw & (REQ_DISCARD | REQ_COPY))) > return true; > > return false; > @@ -260,8 +260,8 @@ static inline unsigned bio_segments(stru > struct bvec_iter iter; > > /* > - * We special case discard/write same, because they interpret bi_size > - * differently: > + * We special case discard/write same/copy, because they > + * interpret bi_size differently: > */ > > if (bio->bi_rw & REQ_DISCARD) > @@ -270,6 +270,9 @@ static inline unsigned bio_segments(stru > if (bio->bi_rw & REQ_WRITE_SAME) > return 1; > > + if (bio->bi_rw & REQ_COPY) > + return 1; > + > bio_for_each_segment(bv, bio, iter) > segs++; > > Index: linux-3.16-rc5/include/linux/blk_types.h > =================================================================== > --- linux-3.16-rc5.orig/include/linux/blk_types.h 2014-07-14 15:17:09.000000000 +0200 > +++ linux-3.16-rc5/include/linux/blk_types.h 2014-07-14 16:26:44.000000000 +0200 > @@ -39,6 +39,11 @@ struct bvec_iter { > current bvec */ > }; > > +struct bio_copy { > + struct block_device *bic_bdev; > + sector_t bic_sector; > +}; > + > /* > * main unit of I/O for the block layer and lower layers (ie drivers and > * stacking drivers) > @@ -81,6 +86,7 @@ struct bio { > #if defined(CONFIG_BLK_DEV_INTEGRITY) > struct bio_integrity_payload *bi_integrity; /* data integrity */ > #endif > + struct bio_copy *bi_copy; /* TODO, use bi_integrity */ > > unsigned short bi_vcnt; /* how many bio_vec's */ > > @@ -160,6 +166,7 @@ enum rq_flag_bits { > __REQ_DISCARD, /* request to discard sectors */ > __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ > __REQ_WRITE_SAME, /* write same block many times */ > + __REQ_COPY, /* copy block range */ > > __REQ_NOIDLE, /* don't anticipate more IO after this one */ > __REQ_FUA, /* forced unit access */ > @@ -203,6 +210,7 @@ enum rq_flag_bits { > #define REQ_PRIO (1ULL << __REQ_PRIO) > #define REQ_DISCARD (1ULL << __REQ_DISCARD) > #define REQ_WRITE_SAME (1ULL << __REQ_WRITE_SAME) > +#define REQ_COPY (1ULL << __REQ_COPY) > #define REQ_NOIDLE (1ULL << __REQ_NOIDLE) > > #define REQ_FAILFAST_MASK \ > @@ -210,14 +218,15 @@ enum rq_flag_bits { > #define REQ_COMMON_MASK \ > (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ > REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \ > - REQ_SECURE) > + REQ_SECURE | REQ_COPY) > #define REQ_CLONE_MASK REQ_COMMON_MASK > > -#define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME) > +#define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME|REQ_COPY) > > /* This mask is used for both bio and request merge checking */ > #define REQ_NOMERGE_FLAGS \ > - (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) > + (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | \ > + REQ_COPY) > > #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) > #define REQ_THROTTLED (1ULL << __REQ_THROTTLED) > Index: linux-3.16-rc5/include/linux/blkdev.h > =================================================================== > --- linux-3.16-rc5.orig/include/linux/blkdev.h 2014-07-14 16:26:22.000000000 +0200 > +++ linux-3.16-rc5/include/linux/blkdev.h 2014-07-14 16:26:44.000000000 +0200 > @@ -289,6 +289,7 @@ struct queue_limits { > unsigned int io_opt; > unsigned int max_discard_sectors; > unsigned int max_write_same_sectors; > + unsigned int max_copy_sectors; > unsigned int discard_granularity; > unsigned int discard_alignment; > > @@ -1012,6 +1013,8 @@ extern void blk_queue_max_discard_sector > unsigned int max_discard_sectors); > extern void blk_queue_max_write_same_sectors(struct request_queue *q, > unsigned int max_write_same_sectors); > +extern void blk_queue_max_copy_sectors(struct request_queue *q, > + unsigned int max_copy_sectors); > extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); > extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); > extern void blk_queue_alignment_offset(struct request_queue *q, > @@ -1168,6 +1171,8 @@ extern int blkdev_issue_discard(struct b > sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); > extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, > sector_t nr_sects, gfp_t gfp_mask, struct page *page); > +extern int blkdev_issue_copy(struct block_device *, sector_t, > + struct block_device *, sector_t, unsigned int, gfp_t); > extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, > sector_t nr_sects, gfp_t gfp_mask); > static inline int sb_issue_discard(struct super_block *sb, sector_t block, > @@ -1367,6 +1372,16 @@ static inline unsigned int bdev_write_sa > return 0; > } > > +static inline unsigned int bdev_copy_offload(struct block_device *bdev) > +{ > + struct request_queue *q = bdev_get_queue(bdev); > + > + if (q) > + return q->limits.max_copy_sectors; > + > + return 0; > +} > + > static inline int queue_dma_alignment(struct request_queue *q) > { > return q ? q->dma_alignment : 511; > Index: linux-3.16-rc5/include/scsi/scsi_device.h > =================================================================== > --- linux-3.16-rc5.orig/include/scsi/scsi_device.h 2014-07-14 15:17:09.000000000 +0200 > +++ linux-3.16-rc5/include/scsi/scsi_device.h 2014-07-14 16:26:44.000000000 +0200 > @@ -119,6 +119,8 @@ struct scsi_device { > unsigned char *vpd_pg83; > int vpd_pg80_len; > unsigned char *vpd_pg80; > + unsigned char naa_len; > + unsigned char *naa; > unsigned char current_tag; /* current tag */ > struct scsi_target *sdev_target; /* used only for single_lun */ > > @@ -151,6 +153,7 @@ struct scsi_device { > unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ > unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ > unsigned no_write_same:1; /* no WRITE SAME command */ > + unsigned no_copy:1; /* no copy offload */ > unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ > unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ > unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ > Index: linux-3.16-rc5/include/uapi/linux/fs.h > =================================================================== > --- linux-3.16-rc5.orig/include/uapi/linux/fs.h 2014-07-14 15:17:09.000000000 +0200 > +++ linux-3.16-rc5/include/uapi/linux/fs.h 2014-07-14 16:26:44.000000000 +0200 > @@ -149,6 +149,7 @@ struct inodes_stat_t { > #define BLKSECDISCARD _IO(0x12,125) > #define BLKROTATIONAL _IO(0x12,126) > #define BLKZEROOUT _IO(0x12,127) > +#define BLKCOPY _IO(0x12,128) > > #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ > #define FIBMAP _IO(0x00,1) /* bmap access */ > Index: linux-3.16-rc5/block/compat_ioctl.c > =================================================================== > --- linux-3.16-rc5.orig/block/compat_ioctl.c 2014-07-14 16:26:38.000000000 +0200 > +++ linux-3.16-rc5/block/compat_ioctl.c 2014-07-14 16:26:44.000000000 +0200 > @@ -696,6 +696,7 @@ long compat_blkdev_ioctl(struct file *fi > * but we call blkdev_ioctl, which gets the lock for us > */ > case BLKRRPART: > + case BLKCOPY: > return blkdev_ioctl(bdev, mode, cmd, > (unsigned long)compat_ptr(arg)); > case BLKBSZSET_32: > Index: linux-3.16-rc5/block/bio.c > =================================================================== > --- linux-3.16-rc5.orig/block/bio.c 2014-07-14 16:26:24.000000000 +0200 > +++ linux-3.16-rc5/block/bio.c 2014-07-14 16:26:44.000000000 +0200 > @@ -239,6 +239,8 @@ static void __bio_free(struct bio *bio) > { > bio_disassociate_task(bio); > > + kfree(bio->bi_copy); > + > if (bio_integrity(bio)) > bio_integrity_free(bio); > } > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
