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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-04-30 13:16:21 +0900 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-05-02 10:17:35 -0500 |
| commit | 9f5de6b105bfa45911d46566df0b36720b648c42 (patch) | |
| tree | ef65b8fc303416def57688c8681a38af1f211c19 /block | |
| parent | 0462590efe9a562dd2aa976ae2dc9cd2e6f5a0c6 (diff) | |
| download | lwn-9f5de6b105bfa45911d46566df0b36720b648c42.tar.gz lwn-9f5de6b105bfa45911d46566df0b36720b648c42.zip | |
[SCSI] bsg: add large command support
This enables bsg to handle the request length larger than BLK_MAX_CDB
(mainly for the variable length CDB format).
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bsg.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/block/bsg.c b/block/bsg.c index 23ea4fd1a66d..d8b889d2e411 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -174,7 +174,11 @@ unlock: static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, struct sg_io_v4 *hdr, int has_write_perm) { - memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ + if (hdr->request_len > BLK_MAX_CDB) { + rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); + if (!rq->cmd) + return -ENOMEM; + } if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, hdr->request_len)) @@ -211,8 +215,6 @@ bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) if (hdr->guard != 'Q') return -EINVAL; - if (hdr->request_len > BLK_MAX_CDB) - return -EINVAL; if (hdr->dout_xfer_len > (q->max_sectors << 9) || hdr->din_xfer_len > (q->max_sectors << 9)) return -EIO; @@ -302,6 +304,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) } return rq; out: + if (rq->cmd != rq->__cmd) + kfree(rq->cmd); blk_put_request(rq); if (next_rq) { blk_rq_unmap_user(next_rq->bio); @@ -455,6 +459,8 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, ret = rq->errors; blk_rq_unmap_user(bio); + if (rq->cmd != rq->__cmd) + kfree(rq->cmd); blk_put_request(rq); return ret; |