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This article is to share with you about how to implement ceph object map. The editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

Ceph::BitVector m_object_map is introduced into object map.

Is a bitmap implementation that records the existence status of each object according to object_no. Masking object _ map [object _ no]! = new_state)

Each image pair should have one object_map:

Namespace librbd {

Class AsyncOperation

Class AsyncRequest

Class AsyncResizeRequest

Class CopyupRequest

Class ImageWatcher

Struct ImageCtx {

CephContext * cct

...

ObjectMap object_map; / / = > the original pull is: ceph::BitVector object_map

Check here to see if object exists:

If (! object_map.object_may_exist-> object_map.object_may_exist (m_object_no))

When you do copy_up, you will set the corresponding object to OBJECT_EXISTS:

Bool sent = object_map.aio_update-> object_map.aio_update (m_object_no, OBJECT_EXISTS)

Boost::optional ()

Ctx)

-

Create an image that supports object map:

. / rbd create-- image-feature exclusive-lock-- image-feature object-map-- image-feature layering-p rbd user1_image_om-- size 1024-- image-format 2

There is a special object to store the object map:

Rbd_object_map.4a3ec5a23fb32

Rbd_header.4a3ec5a23fb32

Rbd_id.user1_image_om

/ * New-style rbd image 'foo' consists of objects

* rbd_id.foo-id of image

* rbd_header. -image metadata

* rbd_object_map. -optional image object map

* rbd_data..00000000

* rbd_data..00000001

*.-data

, /

# define RBD_HEADER_PREFIX "rbd_header."

# define RBD_OBJECT_MAP_PREFIX "rbd_object_map."

# define RBD_DATA_PREFIX "rbd_data."

# define RBD_ID_PREFIX "rbd_id."

Create the correct pose that supports object map on hammer:

[guzhongyan@ceph32] $rbd create-- size 50000-- image-format 2-- image-features + 12 test_image_om

[guzhongyan@ceph32 ~] $rbd info test_image_om

Rbd image 'test_image_om':

Size 50000 MB in 12500 objects

Order 22 (4096 kB objects)

Block_name_prefix: rbd_data.6ac6606b8b4567

Format: 2

Features: exclusive, object map

Flags:

The above is how to implement ceph object map. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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