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Man Pages
VFS_STATFS(9) FreeBSD Kernel Developer's Manual VFS_STATFS(9)

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.

VFS(9), vnode(9)

This manual page was written by Doug Rabson.
May 23, 2009 FreeBSD 12.0-RELEASE

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