VFS_STATFS(9)						   BSD 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);

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.

BSD
								   May 23, 2009 							       BSD