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vxfs_ap_define - define a new allocation policy


cc -I /opt/VRTS/include -L /opt/VRTS/lib

-l vxfsutil -ldl

#include <sys/types.h>

#include <vxfsutil.h>

int vxfs_ap_define(int fd, struct fsap_info *fsap, uint32_t flags);




vxfs_ap_define() defines an allocation policy with the specified name, flags, order, and volume names. If the policy name is already defined, the definition is overwritten with the new values. The specified volume names must all exist as component volumes in the file system. The file descriptor fd specifies any file in the file system where the policy will be defined. The flags argument is currently unused.

To use this function, specify -l vxfsutil while linking.


Assigning or defining an allocation policy can fail because of a conflict with volume flags. The conflict detection attempts to detect all conflicts, but there is no guarantee that all conflicts will be detected.

This API supports file system versions 6.0 and above.

struct fsap_info { char ap_name[FSAP_NAMESZ]; uint32_t ap_flags; uint32_t ap_order; uint32_t ap_ndevs; char ap_devs[FSAP_MAXDEVS][FSDEV_NAMESZ]; };

Possible value for ap_flags is:
  The policy can be assigned by non-privileged users. By default, only privileged users can assign policies.

Possible values for ap_order are:

  Allocations are done from the volume in the order in which they are given in the allocation policy.
  Allocations are done from the volume specified in the allocation policy that has the most free blocks.
  Allocations are done from a volume that is selected in a round-robin fashion from those specified in the allocation policy.


vxfs_ap_define() returns zero on success, non-zero on failure.


EEXIST The specified policy name is reserved.
EFAULT An address specified by an argument is invalid.
EINVAL The specified number of volumes exceeds the maximum number of volumes.
EIO An I/O error occurred during the operation.
ENOENT One or more of the specified volumes does not exist in the file system.
ENOMEM Sufficient memory could not be allocated to hold path names.
ENOSPC There was not enough space to store the policy definition.
ENOSYS There is no license installed to allow this operation.
ENOTSUP This operation is not supported by the disk layout version of the specified file system. Use vxupgrade(1m) to enable this operation.
ENXIO An I/O error occurred during the operation.
EPERM The effective user ID of the calling process does not have appropriate priviledges to perform this operation.
ERANGE The result was too large.
EROFS The specified file system is mounted read-only.
VX_ETOOMANYVOLS Too many volumes were specified for the volume set.


vxfs_ap_assign_ckpt(3), vxfs_ap_assign_file(3), vxfs_ap_assign_fs(3), vxfs_ap_remove(3), vxfs_ap_enforce_file(3), vxfs_ap_enumerate(3), vxfs_ap_query(3), vxfs_ap_query_ckpt(3), vxfs_ap_query_file(3), vxfs_ap_query_fs(3), vxfs_vol_add(3), vxfs_vol_deencapsulate(3), vxfs_vol_encapsulate(3), vxfs_vol_enumerate(3), vxfs_vol_remove(3), vxfs_vol_resize(3), vxfs_vol_stat(3)

VxFS 7.4 vxfs_ap_define(3)