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authorHannes Reinecke <hare@suse.de>2011-08-24 10:51:13 +0200
committerJames Bottomley <JBottomley@Parallels.com>2011-08-30 12:26:49 -0700
commitd7c48feb38a5cb6d863d69fd5ef6c309971ebe31 (patch)
treecb2701400ab0992ecb7d8e84d3d9f70d38bbb51c /include
parentac81c6a832a8769d1cc7ffda361aa3dc3d8f06dc (diff)
downloadop-kernel-dev-d7c48feb38a5cb6d863d69fd5ef6c309971ebe31.zip
op-kernel-dev-d7c48feb38a5cb6d863d69fd5ef6c309971ebe31.tar.gz
[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')
-rw-r--r--include/scsi/scsi_device.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index d371c3c..f751d37 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"
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