Module Nn_db

module Nn_db: sig .. end

Namenode access routines to database

class type ro_transaction = object .. end

class type transaction = object .. end

type inodeinfo = Pfs_rpcapi_aux.inodeinfo

val init : Pfs_db.db_config -> Unixqueue.event_system -> unit

The esys is used for ro transactions

val ro_esys : unit -> Unixqueue.event_system

Returns the esys for ro transactions

val commit_all_prepared_transactions : unit -> unit

Commits all prepared transactions at system startup

val transact : Unixqueue.event_system -> transaction

Finds an unused connection, and start a transaction

val ro_transact : unit -> ro_transaction Uq_engines.engine

Same for read-only transactions. Note that this is an engine: If the number of connections has reached the limit, it is waited until an existing connection becomes unused.

val with_ro_trans : (Pfs_db.ro_async_connection -> Unixqueue.event_system -> 'a Uq_engines.engine) ->
       'a Uq_engines.engine

with_ro_trans f: Runs e = f conn esys for a shared read-only transaction and returns e

val datastore_list_e : Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> Nn_datastores.datastore list Uq_engines.engine

Gets a list of all datastores

val datastore_list_ro_e : unit -> Nn_datastores.datastore list Uq_engines.engine

same, using an ro transaction

val datastore_find_e : identity:string ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> Nn_datastores.datastore option Uq_engines.engine

Find a datastore by identity

val datastore_find_ro_e : identity:string -> Nn_datastores.datastore option Uq_engines.engine

same, using an ro transaction

val datastore_upd_e : id:int ->
       identity:string ->
       size:int64 ->
       enabled:bool ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Updates the datastore table. If the record is new, it is added.

The blockalloc table is updated, too: For new stores, the rows are added. If the size of the existing store is increased, further rows are added.

It is an error to decrease the size.

val datastore_del_e : id:int ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Deletes the datastore with this ID and all rows referencing it

val revision_get_e : Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> string Uq_engines.engine

Get the revision string

val revision_get_ro_e : unit -> string Uq_engines.engine

same, using an ro transaction

val revision_upd_e : revstr:string ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Updates the revision string

val blockalloc_list_e : datastore:int ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> (int64 * string) list Uq_engines.engine

Reads the blockalloc table for this datastore ID. Returns the table as pairs (blkidx,blkmap)

val blockalloc_list_ro_e : datastore:int -> (int64 * string) list Uq_engines.engine

same, using an ro transaction

val blockalloc_upd_e : datastore:int ->
       blkidx:int64 ->
       blkmap:string ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Updates the blockalloc table

val inode_listall_e : Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> int64 list Uq_engines.engine

list all inode numbers

val inode_get_e : id:int64 ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> inodeinfo option Uq_engines.engine

Loads the inode data if existing

val inode_get_ro_e : id:int64 -> inodeinfo option Uq_engines.engine

same, using an ro transaction

val inode_maxid_e : Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> int64 Uq_engines.engine

Returns the max ID

val inode_maxid_ro_e : unit -> int64 Uq_engines.engine

same, using an ro transaction

val inode_ins_e : id:int64 ->
       inodeinfo ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Inserts a new row into inode

val inode_upd_e : id:int64 ->
       inodeinfo ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Updates a row in inode. filetype cannot be updated, and changes are silently ignored.

val inode_upd_time_e : id:int64 ->
       mtime:Pfs_rpcapi_aux.time option ->
       ctime:Pfs_rpcapi_aux.time option ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Sets the mtime and/or ctime. It is not an error if the inodes does not exist anymore.

val inode_del_e : id:int64 ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Deletes a row from inode

val inodeblocks_get_e : inode:int64 ->
       blkidx:int64 ->
       len:int64 ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> Pfs_rpcapi_aux.blockinfo list Uq_engines.engine

Gets the block information for inode in the range from index blkidx to blkidx+len-1.

val inodeblocks_get_ro_e : inode:int64 ->
       blkidx:int64 -> len:int64 -> Pfs_rpcapi_aux.blockinfo list Uq_engines.engine

same, using an ro transaction

val inodeblocks_getall_e : inode:int64 ->
       dsid:int ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> (int64 * int64) list Uq_engines.engine

Returns list of (blkidx,block) for this inode and this datastore dsid (for fsck)

val inodeblocks_del_e : inode:int64 ->
       blkidx:int64 ->
       len:int64 ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Delete the blocks for inode in the range from index blkidx to blkidx+len-1.

val inodeblocks_ins_e : inode:int64 ->
       Pfs_rpcapi_aux.blockinfo list ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Insert these blocks

val names_get_e : dir_inode:int64 ->
       name:string ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> int64 option Uq_engines.engine

Look up inode by dir_inode and name

val names_get_ro_e : dir_inode:int64 -> name:string -> int64 option Uq_engines.engine

same, using an ro transaction

val names_rev_get_e : inode:int64 ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> (int64 * string) list Uq_engines.engine

Look up names by inode. The return values are the inode of the directory and the member name. (No complete paths.)

val names_rev_get_ro_e : inode:int64 -> (int64 * string) list Uq_engines.engine

same, using an ro transaction

val names_get_parent_e : inode:int64 ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> int64 option Uq_engines.engine

Look up the parent inode of an inode. This works only reliably for directories - file inodes can have multiple parents, and in this case None is returned.

val names_get_parent_ro_e : inode:int64 -> int64 option Uq_engines.engine

same, using an ro transaction

val names_count_e : inode:int64 ->
       Pfs_db.ro_async_connection -> Unixqueue.event_system -> int Uq_engines.engine

Count names of an inode

val names_count_ro_e : inode:int64 -> int Uq_engines.engine

same, using an ro transaction

val names_list_e : dir_inode:int64 ->
       Pfs_db.ro_async_connection ->
       Unixqueue.event_system -> (string * int64) list Uq_engines.engine

Lists the contents of the directory identified by dir_inode. The contents are the member names and the inodes of the members.

val names_list_ro_e : dir_inode:int64 -> (string * int64) list Uq_engines.engine

same, using an ro transaction

val names_ins_e : dir_inode:int64 ->
       name:string ->
       inode:int64 ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Insert this name to inode mapping

val names_del_e : dir_inode:int64 ->
       name:string ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Delete this name

Two-phase commit support

type modification = [ `Blockalloc_upd of int * int64 * string
       | `Datastore_del of int
       | `Datastore_upd of int * string * int64 * bool
       | `Inode_del of int64
       | `Inode_ins of int64 * inodeinfo
       | `Inode_upd of int64 * inodeinfo
       | `Inode_upd_time of
           int64 * Pfs_rpcapi_aux.time option * Pfs_rpcapi_aux.time option
       | `Inodeblocks_del of int64 * int64 * int64
       | `Inodeblocks_ins of int64 * Pfs_rpcapi_aux.blockinfo list
       | `Names_del of int64 * string
       | `Names_ins of int64 * string * int64
       | `Revision_upd of string ]

Database modification operations that are covered by the 2-phase commit protocol. The names of the operations correspond to those in Nn_db and Nn_slave.

val exec_e : modification ->
       Pfs_db.rw_async_connection ->
       Unixqueue.event_system -> unit Uq_engines.engine

Performs the passed modification

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