Moving data from file on storage volume to alternate location to free space

NON-GHOSTED FILE 14

-METADATA 22

- LOGICAL FILE SIZE

- SIZE ON VOLUME 12

- CREATE TIME

- MODIFY TIME

- ACCESS TIME

- ACCESS PERMISSIONS

- FILE ATTRIBUTES

- DATA 20

- PRIMARY DATA 20

- ALTERNATE DATA 20

t

GHOSTED FILE 14

- METADATA 22

- LOGICAL FILE SIZE [SAME]

- SIZE ON VOLUME 12 [LESS]

- CREATE TIME

- MODIFY TIME

- ACCESS TIME

- ACCESS PERMISSIONS

- FILE ATTRIBUTES

- GHOSTED ATTRIBUTE

- GHOSTING INFO 24

- ID

- STORAGE

- DATA 20

- ALTERNATE DATA 20

SINK 18

- ID

-NON-GHOSTED FILE 14

FIG. 3B

RECEIVE REQUEST TO ACCESS DATA 20 OF GHOSTED FILE 14 - 501

t

LOCATE FILE 14 ON VOLUME 12 - 503

IDENTIFY GHOSTING INFO 24 IN METADATA FOR FILE 14 - 505

1

LOCATE DATA 20 OF FILE 14 AS STORED AT SINK 18 BASED ON IDENTIFIED GHOSTING INFO 24 - 507

ALLOCATE SPACE TO BE OCCUPIED BY DATA 20 ON VOLUME 12

-509

t

MOVE LOCATED DATA 20 FROM SINK 18 TO SOURCE 10 - 511

t

RESET GHOSTED ATTRIBUTE IN METADATA 22 FOR FILE 14-513

t

REMOVE GHOSTING INFO FROM METADATA 22 FOR FILE 14-515

FIG. 5

FILE SYSTEM 16 - RECEIVE OPEN COMMAND FOR GHOSTED FILE

14 FROM AP 30-601

I

RETURN ERROR - 603

GHOSTING FILTER 26 - INTERCEPT RETURNED ERROR - 605

RETRIEVE GHOSTING INFORMATION 24 FOR GHOSTED FILE 14 VIA

FILE SYSTEM 16-607

DELIVER HANDLE FOR GHOSTED FILE 14 TO AP 30 - 609

RECEIVE READ COMMAND FOR GHOSTED FILE 14 FROM AP 30

611

STORE READ COMMAND IN QUEUE - 613