fp_fsync Kernel Service

Purpose

Writes changes for a specified range of a file to permanent storage.

#include <sys/fp_io.h>

int fp_fsync (fp, how, off, len)
struct file *fp;
int how;
offset_t off;
offset_t len;

The fp_fsync kernel service is an internal interface to the function provided by the fsync_range subroutine.

Item	Description
fp	Points to a file structure returned by the fp_open kernel service.
how	Specifies the following handling characteristics of the operation: FDATASYNC The changed data in the range specified by the `off` and `len` parameters is written to the storage. If the metadata for the file is changed and this changed metadata must read the data, the metadata is also written to the storage. Otherwise, the metadata is not updated. FFILESYNC The changed data in the range specified by the `off` and `len` parameters is written to the storage. If any metadata is changed, all of the changed user data is written to the storage. Metadata changes and file attributes including time stamps are also written to the storage.
off	Specifies the starting offset value of the data in the file to be written to the storage.
len	Specifies the length of the file range to be written to the storage. If you specify the value as zero, all cached data is written to the storage.

The fp_fsync kernel service can be called from the process environment only.

Item	Description
0	Indicates a successful operation.
ERRNO	Returns an error number from the /usr/include/sys/errno.h file on failure.