VFS_STATFS(9) - Manual pages

NAME

VFS_STATFS — return file system status

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/vnode.h>

int
VFS_STATFS(struct mount *mp, struct statfs *sbp);

The VFS_STATFS() macro returns various pieces of information about the file system, including recommended I/O sizes, free space, free inodes, etc.

The arguments it expects are:

mp: The file system.
sbp: A statfs structure, as defined by <sys/mount.h>, into which information is placed about the file system.

The fields of struct statfs related to the file system are as follows:

f_type: Type of file system.
f_flags: A copy of mount exported flags.
f_bsize: Fragment size.
f_iosize: Optimal transfer block size.
f_blocks: The total number of data blocks in the file system.
f_bfree: The number of free blocks in the file system.
f_bavail: The number of free blocks available to non-superuser processes.
f_files: The total number of file nodes in the file system.
f_ffree: The number of free nodes available to non-superuser processes.
f_syncwrites: The number of synchronous writes since the file system was mounted.
f_asyncwrites: The number of asynchronous writes since the file system was mounted.
f_syncreads: The number of synchronous reads since the file system was mounted.
f_asyncreads: The number of asynchronous reads since the file system was mounted.
f_namemax: The maximum file name length for this file system.
f_owner: The user ID of the user that mounted the file system.
f_fsid: Unique file system ID.
f_fstypename: The file system type name; a string of at most MFSNAMELEN bytes.
f_mntfromname: The device name the file system was mounted from; a string of at most MNAMELEN bytes.
f_mntonname: The name of the directory on which the file system is mounted; a string of at most MNAMELEN bytes.

This manual page was written by Doug Rabson.