.\" $NetBSD: statvfs.5,v 1.14 2016/06/06 15:02:32 abhinav Exp $ .\" .\" Copyright (c) 1989, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)statfs.2 8.5 (Berkeley) 5/24/95 .\" .Dd June 2, 2016 .Dt STATVFS 5 .Os .Sh NAME .Nm statvfs .Nd file system statistics .Sh SYNOPSIS .In sys/types.h .In sys/statvfs.h .Sh DESCRIPTION The .In sys/statvfs.h header defines the structures and functions that return information about a mounted file system. The .Nm statvfs structure is defined as follows: .Bd -literal typedef struct { int32_t val[2]; } fsid_t; /* file system id type */ #define VFS_NAMELEN 32 /* length of fs type name, including nul */ #define VFS_MNAMELEN 1024 /* length of buffer for returned name */ struct statvfs { unsigned long f_flag; /* copy of mount exported flags */ unsigned long f_bsize; /* system block size */ unsigned long f_frsize; /* system fragment size */ unsigned long f_iosize; /* optimal file system block size */ /* The following are in units of f_frsize */ fsblkcnt_t f_blocks; /* number of blocks in file system */ fsblkcnt_t f_bfree; /* free blocks avail in file system */ fsblkcnt_t f_bavail; /* free blocks avail to non-root */ fsblkcnt_t f_bresvd; /* blocks reserved for root */ fsfilcnt_t f_files; /* total file nodes in file system */ fsfilcnt_t f_ffree; /* free file nodes in file system */ fsfilcnt_t f_favail; /* free file nodes avail to non-root */ fsfilcnt_t f_fresvd; /* file nodes reserved for root */ uint64_t f_syncreads; /* count of sync reads since mount */ uint64_t f_syncwrites; /* count of sync writes since mount */ uint64_t f_asyncreads; /* count of async reads since mount */ uint64_t f_asyncwrites; /* count of async writes since mount */ unsigned long f_fsid; /* POSIX compliant file system id */ fsid_t f_fsidx; /* NetBSD compatible file system id */ unsigned long f_namemax;/* maximum filename length */ uid_t f_owner; /* user that mounted the file system */ uint32_t f_spare[4]; /* spare space */ char f_fstypename[VFS_NAMELEN]; /* fs type name */ char f_mntonname[VFS_MNAMELEN]; /* directory on which mounted */ char f_mntfromname[VFS_MNAMELEN]; /* mounted file system */ }; .Ed .Pp The .Fa f_flag argument can have the following bits set: .Bl -tag -width ST_SYNCHRONOUS .It Dv ST_RDONLY The filesystem is mounted read-only; Even the super-user may not write on it. .It Dv ST_NOEXEC Files may not be executed from the filesystem. .It Dv ST_NOSUID Setuid and setgid bits on files are not honored when they are executed. .It Dv ST_NODEV Special files in the filesystem may not be opened. .It Dv ST_UNION Union with underlying filesystem instead of obscuring it. .It Dv ST_SYNCHRONOUS All I/O to the filesystem is done synchronously. .It Dv ST_ASYNC No filesystem I/O is done synchronously. .It Dv ST_NOCOREDUMP Don't write core dumps to this file system. .It Dv ST_NOATIME Never update access times. .It Dv ST_SYMPERM Recognize symbolic link permission. .It Dv ST_NODEVMTIME Never update modification times for device files. .It Dv ST_LOG Use logging (journalling). .It Dv ST_LOCAL The filesystem resides locally. .It Dv ST_QUOTA The filesystem has quotas enabled on it. .It Dv ST_ROOTFS Identifies the root filesystem. .It Dv ST_EXRDONLY The filesystem is exported read-only. .It Dv ST_EXPORTED The filesystem is exported for both reading and writing. .It Dv ST_DEFEXPORTED The filesystem is exported for both reading and writing to any Internet host. .It Dv ST_EXPORTANON The filesystem maps all remote accesses to the anonymous user. .It Dv ST_EXKERB The filesystem is exported with Kerberos uid mapping. .It Dv ST_EXNORESPORT Don't enforce reserved ports (NFS). .It Dv ST_EXPUBLIC Public export (WebNFS). .El .Pp Fields that are undefined for a particular file system are set to \-1. .Sh NOTES .Bl -tag -width f_bavail .It f_flag The .Fa f_flag field is the same as the .Fa f_flags field in the .Bx 4.3 .Ic statfs system call. .It f_fsid Is defined to be .Ft unsigned long by the X/Open standard. Unfortunately this is not enough space to store our .Ft fsid_t , so we define an additional .Fa f_fsidx field. .It f_bavail Could historically be negative (in the .Ic statfs system call) when the used space has exceeded the non-superuser free space. In order to comply with the X/Open standard, we have to define .Ft fsblkcnt_t as an unsigned type, so in all cases where .Fa f_bavail would have been negative, we set it to 0. In addition we provide .Fa f_bresvd which contains the amount of reserved blocks for the superuser, so the old value of .Fa f_bavail can be easily computed as: .Bd -literal old_bavail = f_bfree - f_bresvd; .Ed .El .Sh SEE ALSO .Xr statvfs 2 .Sh HISTORY The .In sys/statvfs.h header first appeared in .Nx 3.0 .