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Manual Pages  — VFS_STATFS

NAME

VFS_STATFS – return file system status

CONTENTS

SYNOPSIS

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

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

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.

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.

VFS_STATFS (9) May 23, 2009

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