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authorBoaz Harrosh <bharrosh@panasas.com>2009-11-29 16:26:45 +0200
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 12:01:46 -0600
commit2cdd6410e5a1665823f2a048fc7f8f6a8384be1d (patch)
tree327ae154abd84aea9c18eb24eb87c9d6f8029d26 /include/scsi/osd_sec.h
parentd6ae4333e648492721a098bdc329bbd82d25eb67 (diff)
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[SCSI] libosd: osd_dev_info: Unique Identification of an OSD device
Define an osd_dev_info structure that Uniquely identifies an OSD device lun on the network. The identification is built from unique target attributes and is the same for all network/SAN machines. osduld_info_lookup() - NEW New API that will lookup an osd_dev by its osd_dev_info. This is used by pNFS-objects for cross network global device identification. And by exofs multy-device support, the device info is specified in the on-disk exofs device table. osduld_device_info() - NEW Given an osd_dev handle returns its associated osd_dev_info. The ULD fetches this information at startup and hangs it on each OSD device. (This is a fast operation that can be called at any condition) osduld_device_same() - NEW With a given osd_dev at one hand and an osd_dev_info at another, we would like to know if they are the same device. Two osd_dev handles can be checked by: osduld_device_same(od1, osduld_device_info(od2)); osd_auto_detect_ver() - REVISED Now returns an osd_dev_info structure. Is only called once by ULD as before. See added comments for how to use. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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