diff options
| author | Tony Battersby <tonyb@cybernetics.com> | 2007-11-12 16:00:44 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-12 01:22:44 +0100 |
| commit | 25d7c363f2663fe399e623c9bd819258c9760bdc (patch) | |
| tree | c03867708e9f66e236163e81913cdd1c516e9f12 | |
| parent | [SCSI] megaraid_sas: Update version and changelog (diff) | |
| download | linux-25d7c363f2663fe399e623c9bd819258c9760bdc.tar.xz linux-25d7c363f2663fe399e623c9bd819258c9760bdc.zip | |
[SCSI] move single_lun flag from scsi_device to scsi_target
Some SCSI tape medium changers that need the BLIST_SINGLELUN flag have
the medium changer at one LUN and the tape drive at a different LUN.
The inquiry string of the tape drive may be different from that of the
medium changer. In order for single_lun to be effective, every
scsi_device under a given scsi_target must have it set. This means that
there needs to be a blacklist entry for BOTH the medium changer AND the
tape drive, which is impractical because some medium changers may be
paired with a variety of different tape drive models. It makes more
sense to put the single_lun flag in scsi_target instead of scsi_device,
which causes every device at a given target ID to inherit the single_lun
flag from one LUN. This makes it possible to blacklist just the medium
changer and not the tape drive.
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 4 | ||||
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 6 |
3 files changed, 6 insertions, 6 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 199b02452259..b0c59ae63a2f 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -526,7 +526,7 @@ static void scsi_run_queue(struct request_queue *q) struct Scsi_Host *shost = sdev->host; unsigned long flags; - if (sdev->single_lun) + if (scsi_target(sdev)->single_lun) scsi_single_lun_run(sdev); spin_lock_irqsave(shost->host_lock, flags); @@ -1559,7 +1559,7 @@ static void scsi_request_fn(struct request_queue *q) if (!scsi_host_queue_ready(q, shost, sdev)) goto not_ready; - if (sdev->single_lun) { + if (scsi_target(sdev)->single_lun) { if (scsi_target(sdev)->starget_sdev_user && scsi_target(sdev)->starget_sdev_user != sdev) goto not_ready; diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 7e8b2045ccfa..ada72af0a6dd 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -865,7 +865,7 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, sdev->no_start_on_add = 1; if (*bflags & BLIST_SINGLELUN) - sdev->single_lun = 1; + scsi_target(sdev)->single_lun = 1; sdev->use_10_for_rw = 1; diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 6c2d80b36aa1..45bb12b54175 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -122,9 +122,6 @@ struct scsi_device { unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ unsigned simple_tags:1; /* simple queue tag messages are enabled */ unsigned ordered_tags:1;/* ordered queue tag messages are enabled */ - unsigned single_lun:1; /* Indicates we should only allow I/O to - * one of the luns for the device at a - * time. */ unsigned was_reset:1; /* There was a bus reset on the bus for * this device */ unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN @@ -202,6 +199,9 @@ struct scsi_target { unsigned int id; /* target id ... replace * scsi_device.id eventually */ unsigned int create:1; /* signal that it needs to be added */ + unsigned int single_lun:1; /* Indicates we should only + * allow I/O to one of the luns + * for the device at a time. */ unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */ /* means no lun present */ |