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Hi, folks
Following is the "initial version" method that map OpenDLM to G-lock:
Fields in struct lm_lockops:
* mount
Initialize all data struct for mount ogfs.
lockspace: get lockspace basing on cidev(because different ogfs instants
using different cidev). Record lockspace and node's information(such as
CB, fsdata, etc) in a private data sturct.
ls_jid: get it by reading cidev
ls_first: determined by using deadman lock (the first node would block
all other nodes untile "others_may_mount" is called)
*others_may_mount
Demote others ondes' deadman lock to share mode, and allow other nodes
grab their own deadman lock.
*unmount
Clean up all data struct. Release all locks.
*get_lock
Allocate and initialize a private lock struct.
*put_lock
Clean and free a private lock struct.
*lock
Try to lock
Lock state translation:
LM_ST_UNLOCKED->NL
LM_ST_EXCLUSIVE->EX
LM_ST_SHARED->PR
LM_ST_DEFERRED-> PR ??
Lock flag translation:
??
Note: All locks are persistent DLM lock.
*unlock
Try to unlock
*reset
Change lock state to NL.
*cancel
Cancel a lock/convert request
*hold_lvb
dlm_scnop
Note: The default size of lvb in OpenDLM is 16 bytes, we need to change
it to 32bytes.
*unhold_lvb
dlm_scnop
*sync_lvb
dlm_scnop
*reset_lvb
dlm_purge
Fields in struct lm_lockstruct
*ls_jid
See previous section.
*ls_first
See previous section.
*ls_lockspace
See previous section.
*ls_ops
See previous section.
This a incompleted version, please give me help to make it work :)
Any concern or suggestion ?
Best Regards,
Stan
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