Optional functions implemented in DMAPI for GPFS

For C declarations of these optional functions implemented in DMAPI for GPFS, refer to the dmapi.h file located in the /usr/lpp/mmfs/include directory. However, for a quick description of the optional functions and their applications, refer to the following set of functions:

dm_downgrade_right

Change an exclusive access right to a shared access right.

dm_get_bulkall

Return a file system's bulk data management attributes.

dm_get_dmattr

Return a data management attribute.

dm_getall_dmattr

Return all data management attributes of a file.

dm_handle_to_fsid

Get a file system ID using its handle.

dm_handle_to_igen

Get inode generation count using a handle.

dm_handle_to_ino

Get inode from a handle.

dm_make_handle

Create a DMAPI object handle.

dm_make_fshandle

Create a DMAPI file system handle.

dm_punch_hole

Make a hole in a file.

dm_probe_hole

Calculate the rounded result of the area where it is assumed that a hole is to be punched.

dm_remove_dmattr

Delete a data management attribute.

dm_set_dmattr

Define or update a data management attribute.

dm_set_return_on_destroy

Indicate a DM attribute to return with destroy events.

dm_sync_by_handle

Synchronize the in-memory state of a file with the physical medium.

dm_upgrade_right

Change a currently held access right to be exclusive.