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ocf: serialize base bdev names in OCF UUID

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Use OCF per-volume UUID field to serialize bdev names.
This is going to be used during cache load to find out
  which bdevs we want to attach.

Note that there is in fact "user_metadata" buffor that is
  also stored in cache metadata, but we cannot use it
  because its size is limited to 64 bytes.
  UUID in OCF terms is not standarized
  and is meant to be used to store custom immutable data.

This change preparation for persistent metadata support.
Functionality is not changed. (everything works the same way)

Change-Id: Ia9204fae29106f5b816d93a6771425a223d6c028
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/455414
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Vitaliy Mysak 2019-05-22 21:22:34 +00:00 committed by Jim Harris
parent 1292ef24e7
commit 4003ebf73c
2 changed files with 14 additions and 2 deletions
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11
lib/bdev/ocf/vbdev_ocf.c
View File

@ -1068,10 +1068,17 @@ init_vbdev_config(struct vbdev_ocf *vbdev)
vbdev->cfg.core.try_add = true;
}
/* Serialize bdev names in OCF UUID to interpret on future loads
* Core UUID is pair of (core bdev name, cache bdev name)
* Cache UUID is cache bdev name */
cfg->device.uuid.size = strlen(vbdev->cache.name) + 1;
cfg->device.uuid.data = vbdev->cache.name;
cfg->core.uuid.size = strlen(vbdev->core.name) + 1;
cfg->core.uuid.data = vbdev->core.name;
snprintf(vbdev->uuid, VBDEV_OCF_MD_MAX_LEN, "%s %s",
vbdev->core.name, vbdev->name);
cfg->core.uuid.size = strlen(vbdev->uuid) + 1;
cfg->core.uuid.data = vbdev->uuid;
vbdev->uuid[strlen(vbdev->core.name)] = 0;
}
/* Allocate vbdev structure object and add it to the global list */

5
lib/bdev/ocf/vbdev_ocf.h
View File

@ -39,6 +39,8 @@
#include "spdk/bdev.h"
#include "spdk/bdev_module.h"
#define VBDEV_OCF_MD_MAX_LEN 4096
struct vbdev_ocf;
/* Context for OCF queue poller
@ -169,6 +171,9 @@ struct vbdev_ocf {
/* Exposed SPDK bdev. Registered in bdev layer */
struct spdk_bdev exp_bdev;
/* OCF uuid for core device of this vbdev */
char uuid[VBDEV_OCF_MD_MAX_LEN];
/* Link to global list of this type structures */
TAILQ_ENTRY(vbdev_ocf) tailq;
};