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[SCSI] libosd: osd_dev_info: Unique Identification of an OSD device

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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>
This commit is contained in:
Boaz Harrosh
2009-11-29 16:26:45 +02:00
committed by James Bottomley
parent d6ae4333e6
commit 2cdd6410e5
3 changed files with 151 additions and 13 deletions
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38
include/scsi/osd_initiator.h
View File

@@ -55,10 +55,24 @@ struct osd_dev {
#endif
};
/* Retrieve/return osd_dev(s) for use by Kernel clients */
struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/
/* Unique Identification of an OSD device */
struct osd_dev_info {
unsigned systemid_len;
u8 systemid[OSD_SYSTEMID_LEN];
unsigned osdname_len;
u8 *osdname;
};
/* Retrieve/return osd_dev(s) for use by Kernel clients
* Use IS_ERR/ERR_PTR on returned "osd_dev *".
*/
struct osd_dev *osduld_path_lookup(const char *dev_name);
struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi);
void osduld_put_device(struct osd_dev *od);
const struct osd_dev_info *osduld_device_info(struct osd_dev *od);
bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi);
/* Add/remove test ioctls from external modules */
typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
@@ -68,8 +82,24 @@ void osduld_unregister_test(unsigned ioctl);
void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
void osd_dev_fini(struct osd_dev *od);
/* some hi level device operations */
int osd_auto_detect_ver(struct osd_dev *od, void *caps); /* GFP_KERNEL */
/**
* osd_auto_detect_ver - Detect the OSD version, return Unique Identification
*
* @od: OSD target lun handle
* @caps: Capabilities authorizing OSD root read attributes access
* @odi: Retrieved information uniquely identifying the osd target lun
* Note: odi->osdname must be kfreed by caller.
*
* Auto detects the OSD version of the OSD target and sets the @od
* accordingly. Meanwhile also returns the "system id" and "osd name" root
* attributes which uniquely identify the OSD target. This member is usually
* called by the ULD. ULD users should call osduld_device_info().
* This rutine allocates osd requests and memory at GFP_KERNEL level and might
* sleep.
*/
int osd_auto_detect_ver(struct osd_dev *od,
void *caps, struct osd_dev_info *odi);
static inline struct request_queue *osd_request_queue(struct osd_dev *od)
{
return od->scsi_device->request_queue;