Veritas™ File System 5.0.1 Programmer's Reference Guide

fd = open("/mnt", O_RDONLY);

dir_fd = open("/mnt/dir1", O_RDONLY);

vxfs_ap_define(fd, &ap, 0);

/* Create the mirror policy */

strcpy((char *) ap.ap_name, "Mirror_Policy");

ap.ap_flags = FSAP_CREATE | FSAP_INHERIT;

ap.ap_order = FSAP_ORDER_ASGIVEN;

ap.ap_ndevs = 1;

strcpy(ap.ap_devs[0], "vol-01");

vxfs_ap_define(fd, &ap, 0);

/* Assign policies to the directory */

vxfs_ap_assign_file(dir_fd, "RAID5_Policy", “Mirror_Policy”,

0);

/* Create file under directory dir1 */

/* Meta and data blocks for file1 will be allocated on

vol-01 and vol-02 respectively. */

file_fd = open("/mnt/dir1/file1");

write(file_fd, buf, 1024);

Using volume application programming interfaces

The following pseudocode provides an example of using the volume APIs.

To shrink or grow a volume within a file system

Use the vxresize command to grow the physical volume.

To use the vxfs_vol_resize() call to shrink or grow the file system, create

codes similar to the following:

/* stat volume "vol-03" to get the size information */

fd = open("/mnt");

vxfs_vol_stat(fd, "vol-03", infop);

/* resize (shrink/grow) accordingly. This example shrinks

the volume by half */

vxfs_vol_resize(fd, "vol-03", infop->dev_size / 2);

Multi-volume support

Using policies and application programming interfaces