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block: support > 16 byte CDBs for SG_IO

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Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-08-21 20:39:53 -05:00 committed by Jens Axboe
parent 2cada584b2
commit a57821cac6
1 changed files with 17 additions and 7 deletions
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24
block/scsi_ioctl.c
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@ -296,8 +296,6 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->cmd_len > BLK_MAX_CDB)
return -EINVAL;
if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
return -EIO;
@ -316,14 +314,21 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
if (hdr->flags & SG_FLAG_Q_AT_HEAD)
at_head = 1;
ret = -ENOMEM;
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
goto out;
blk_rq_set_block_pc(rq);
if (hdr->cmd_len > BLK_MAX_CDB) {
rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
if (!rq->cmd)
goto out_put_request;
}
ret = -EFAULT;
if (blk_fill_sghdr_rq(q, rq, hdr, mode))
goto out;
goto out_free_cdb;
if (hdr->iovec_count) {
size_t iov_data_len;
@ -333,7 +338,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
0, NULL, &iov);
if (ret < 0) {
kfree(iov);
goto out;
goto out_free_cdb;
}
iov_data_len = ret;
@ -356,7 +361,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
GFP_KERNEL);
if (ret)
goto out;
goto out_free_cdb;
bio = rq->bio;
memset(sense, 0, sizeof(sense));
@ -375,8 +380,13 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
hdr->duration = jiffies_to_msecs(jiffies - start_time);
ret = blk_complete_sghdr_rq(rq, hdr, bio);
out:
out_free_cdb:
if (rq->cmd != rq->__cmd)
kfree(rq->cmd);
out_put_request:
blk_put_request(rq);
out:
return ret;
}