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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2010-10-08 01:36:24 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-10-25 14:57:44 -0500 |
| commit | 518fa8e39bafd2431c28adb8822bb6c3e4d1a390 (patch) | |
| tree | 081b80a9ae9cee54018272cf331800d2dc52e6ab /drivers/scsi/sd.c | |
| parent | 349ed5a060397fcccc542a0314f236b420bd4ad1 (diff) | |
| download | lwn-518fa8e39bafd2431c28adb8822bb6c3e4d1a390.tar.gz lwn-518fa8e39bafd2431c28adb8822bb6c3e4d1a390.zip | |
[SCSI] sd: Export effective protection mode in sysfs
Create a sysfs entry that reports the negotiated DIX/DIF protection mode
for a SCSI disk. This depends on the protection type the disk is
formatted with as well as the protection capabilities advertised by the
controller.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 57d1e3e1bd44..b9ab3a590e4b 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -259,6 +259,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr, } static ssize_t +sd_show_protection_mode(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + unsigned int dif, dix; + + dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); + dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); + + if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { + dif = 0; + dix = 1; + } + + if (!dif && !dix) + return snprintf(buf, 20, "none\n"); + + return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); +} + +static ssize_t sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, char *buf) { @@ -285,6 +307,7 @@ static struct device_attribute sd_disk_attrs[] = { __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, sd_store_manage_start_stop), __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), + __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), __ATTR_NULL, |