VFS_STATFS(9) MidnightBSD Kernel Developer’s Manual VFS_STATFS(9)

NAME

VFS_STATFS — return file system status

SYNOPSIS

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

int

VFS_STATFS(struct mount *mp, struct statfs *sbp, struct thread *td);

DESCRIPTION

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.

td

The thread which is querying 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.

SEE ALSO

VFS(9), vnode(9)

AUTHORS

This manual page was written by Doug Rabson.

MidnightBSD 0.3 January 7, 2005 MidnightBSD 0.3