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VFS_STATFS(9)	       FreeBSD 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 informa-
	  tion 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 pro-
		    cesses.

     f_files	    The	total number of	file nodes in the file system.

     f_ffree	    The	number of free nodes available to non-superuser	pro-
		    cesses.

     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.

FreeBSD	9.3			January	7, 2005			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS

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