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| author |   Hannes Reinecke <hare@suse.de> | 2011-08-24 10:51:13 +0200 |
|---|---|---|
| committer |   James Bottomley <JBottomley@Parallels.com> | 2011-08-30 12:26:49 -0700 |
| commit | d7c48feb38a5cb6d863d69fd5ef6c309971ebe31 (patch) | |
| tree | cb2701400ab0992ecb7d8e84d3d9f70d38bbb51c /include/scsi | |
| parent | [SCSI] libsas: fix sas_queuecommand return values (diff) | |
| download | linux-dev-d7c48feb38a5cb6d863d69fd5ef6c309971ebe31.tar.xz linux-dev-d7c48feb38a5cb6d863d69fd5ef6c309971ebe31.zip | |
[SCSI] scsi_dh_alua: Evaluate TPGS setting from inquiry data
Instead of issuing a standard inquiry from within the
alua device handler we can evaluate the TPGS setting from
the existing inquiry data of the sdev and save us the I/O.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_device.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index d371c3ca90c3..f751d37685e0 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -471,6 +471,11 @@ static inline int scsi_device_protection(struct scsi_device *sdev) return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); } +static inline int scsi_device_tpgs(struct scsi_device *sdev) +{ + return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; +} + #define MODULE_ALIAS_SCSI_DEVICE(type) \ MODULE_ALIAS("scsi:t-" __stringify(type) "*") #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" |