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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
parentd6ae4333e648492721a098bdc329bbd82d25eb67 (diff)
downloadlinux-linaro-android-2cdd6410e5a1665823f2a048fc7f8f6a8384be1d.tar.gz
[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>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/osd_initiator.h38
1 files changed, 34 insertions, 4 deletions
diff --git a/include/scsi/osd_initiator.h b/include/scsi/osd_initiator.h
index 589e5f0d67b..3ec346e15dd 100644
--- a/include/scsi/osd_initiator.h
+++ b/include/scsi/osd_initiator.h
@@ -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;