Veritas™ File System 5.0.1 Programmer's Reference Guide

Read the FCL file and update the index accordingly.

$ vxfs_fcl_read(fh, buf, BUFSZ, FCL_ALL_v4_EVENTS, &nentries)

Get the cookie and store it back in the file.

$ vxfs_fcl_getcookie(fh, &cookie)

$ write(fd, cookie, sizeof(struct fcl_cookie));

Computing a usage profile

This sample application computes the usage profile of a particular file, that is,

the users who have accessed a particular file in the last hour.

Initial setup

This sample application needs additional information such as tracking file opens

and access information, which are available only with FCL Version 4. Be sure to

enable the correct FCL version.

The following steps perform the required initial setup.

To setup up the application

Switch on the FCL with Version 4.

$ fcladm —o version=4 on mntpt

If this step fails, use fcladm print to check for an existing FCL Version 3

file. If present, remove it with fcladm rm and then try switching on FCL with

Version 4.

In VxFS 5.0, the default FCL version is 4. If there is no existing FCL file, the

fcladm on mntpt command automatically creates a Version 4 FCL.

Enable tracking of access information, file-opens, and I/O statistics as needed.

$ fcladm set fileopen,accessinfo mntpt

Set tunables fcl_keeptime, fcl_maxalloc, and fcl_ointerval as required.

For example:

$ vxtunefs fcl_ointerval=value

Sample steps

The following provides sample steps for possible application use.

45File Change Log

Application programming interface for File Change Log