[Lustre-devel] Lustre RPC related information

[Andreas Dilger]

Vilobh Meshram wrote:
> Amongst all these RPC which all are for lock related request and which do not ask for locks .E.g OBD_PING does not asks for locks where as LDLM_ENQUEUE is the main entry point for handling lock related request.It would also be great if you can tell me with which system call which RPC might be invoked.Thanks.
> 
> 
> MDS_CONNECT
> MDS_DISCONNECT

These are used to do initial connect to the MDS service. 

> MDS_GETSTATUS

Gets the root inode for the filesystem. 

> MDS_GETATTR
> MDS_GETATTR_NAME


Gets inode attributes (by inode number or by name), but not used very often since client prefers to get attributes in conjunction with a lock. 

> MDS_SETXATTR
> MDS_GETXATTR 

For getting or setting extended attributes (e.g. ACLs or user xattrs). 

> MDS_STATFS

Gets filesystem space usage (blocks and inodes). 

> MDS_READPAGE

Read aone or more directory pages. 

> MDS_REINT

All filesystem modifying RPCs. 

> MDS_CLOSE

Close a file. 
> MDS_DONE_WRITING

For size-on-mds, currently unused. 

> MDS_PIN

Pin current working directory, currently unused. 

> MDS_SYNC

Sync MDT filesystem  operations to disk. 

> MDS_SET_INFO

Misc flags setting (e.g. Set client export read-only). 

> MDS_QUOTACHECK  
> MDS_QUOTACTL 
> OBD_QC_CALLBACK


For quota checks. 

> MDS_WRITEPAGE 

Currently unused (for CMD directory split, but will probably be removed and done differently). 

> MDS_IS_SUBDIR    

For CMD directory loop checking. 

> OBD_PING

Export keepalive from client. 

> OBD_LOG_CANCEL

Complete distributed transaction. 

> LDLM_ENQUEUE  

Enqueue a new lock. 

> LDLM_CONVERT   

Convert existing lock type (unused) 

> LDLM_CANCEL  

Cancel lock. 

> LDLM_BL_CALLBACK 
> LDLM_CP_CALLBACK  

Callback from server to client to cancel existing lock or grant pending lock. 

> LDLM_GL_CALLBACK

Trylock or return lock state to caller (for  ls -l). 

Cheers, Andreasw
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