diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-07-17 17:08:48 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-07-26 15:14:55 -0400 |
| commit | 7027ad72a689797475973c6feb5f0b673382f779 (patch) | |
| tree | 4f6daa1d509708fb340d09608d79557a9af57f00 /drivers/scsi/scsi_lib.c | |
| parent | db007fc5e20c00b356e9ffe2d0e007398c65c837 (diff) | |
[SCSI] Support devices with protection information
Implement support for DMA of protection information for devices that
are data integrity capable.
- Add support for mapping an extra scatter-gather list containing
the protection information.
- Allocate protection scsi_data_buffer if host is DIX (integrity DMA)
capable.
- Accessor function for checking whether a device has protection
enabled.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index fe77ccacf31..a47c05d7829 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -65,7 +65,7 @@ static struct scsi_host_sg_pool scsi_sg_pools[] = { }; #undef SP -static struct kmem_cache *scsi_sdb_cache; +struct kmem_cache *scsi_sdb_cache; static void scsi_run_queue(struct request_queue *q); @@ -787,6 +787,9 @@ void scsi_release_buffers(struct scsi_cmnd *cmd) kmem_cache_free(scsi_sdb_cache, bidi_sdb); cmd->request->next_rq->special = NULL; } + + if (scsi_prot_sg_count(cmd)) + scsi_free_sgtable(cmd->prot_sdb); } EXPORT_SYMBOL(scsi_release_buffers); @@ -1072,6 +1075,26 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask) goto err_exit; } + if (blk_integrity_rq(cmd->request)) { + struct scsi_data_buffer *prot_sdb = cmd->prot_sdb; + int ivecs, count; + + BUG_ON(prot_sdb == NULL); + ivecs = blk_rq_count_integrity_sg(cmd->request); + + if (scsi_alloc_sgtable(prot_sdb, ivecs, gfp_mask)) { + error = BLKPREP_DEFER; + goto err_exit; + } + + count = blk_rq_map_integrity_sg(cmd->request, + prot_sdb->table.sgl); + BUG_ON(unlikely(count > ivecs)); + + cmd->prot_sdb = prot_sdb; + cmd->prot_sdb->table.nents = count; + } + return BLKPREP_OK ; err_exit: |