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.

Debian                                            May 23, 2009                                     VFS_STATFS(9)