STATVFS(2) Linux Programmer's Manual STATVFS(2)
NAME
statvfs, fstatvfs - get file(1,n) system statistics
SYNOPSIS
#include <sys/statvfs.h>
int statvfs(const char *path, struct statvfs *buf);
int fstatvfs(int fd, struct statvfs *buf);
DESCRIPTION
The function statvfs returns information about a mounted file(1,n) system.
path is the path name of any file(1,n) within the mounted filesystem. buf
is a pointer to a statvfs structure defined approximately as follows:
struct statvfs {
unsigned long f_bsize; /* file(1,n) system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_t f_blocks; /* size of fs in(1,8) f_frsize units(1,7) */
fsblkcnt_t f_bfree; /* # free blocks */
fsblkcnt_t f_bavail; /* # free blocks for non-root */
fsfilcnt_t f_files; /* # inodes */
fsfilcnt_t f_ffree; /* # free inodes */
fsfilcnt_t f_favail; /* # free inodes for non-root */
unsigned long f_fsid; /* file(1,n) system id */
unsigned long f_flag; /* mount(2,8) flags */
unsigned long f_namemax; /* maximum filename length */
};
Here the types fsblkcnt_t and fsfilcnt_t are defined in(1,8) <sys/types.h>.
Both used to be unsigned long.
The field f_flag is a bit mask (of mount(2,8) flags, see mount(2,8)(8)). Bits
defined by POSIX are
ST_RDONLY
Read-only file(1,n) system.
ST_NOSUID
Setuid/setgid bits are ignored by exec(3,n,1 builtins)(2).
It is unspecified whether all members of the returned struct have mean-
ingful values on all filesystems.
fstatvfs returns the same information about an open(2,3,n) file(1,n) referenced by
descriptor fd.
RETURN VALUE
On success, zero is returned. On error(8,n), -1 is returned, and errno is
set(7,n,1 builtins) appropriately.
ERRORS
EACCES (statvfs) Search permission is denied for a component of the
path prefix of path. (See also path_resolution(2).)
EBADF (fstatvfs) fd is not a valid open(2,3,n) file(1,n) descriptor.
EFAULT Buf or path points to an invalid address.
EINTR This call was interrupted by a signal.
EIO An I/O error(8,n) occurred while reading from the file(1,n) system.
ELOOP (statvfs) Too many symbolic links were encountered in(1,8) translat-
ing path.
ENAMETOOLONG
(statvfs) path is too long.
ENOENT (statvfs) The file(1,n) referred to by path does not exist.
ENOMEM Insufficient kernel memory was available.
ENOSYS The file(1,n) system does not support this call.
ENOTDIR
(statvfs) A component of the path prefix of path is not a direc-
tory.
EOVERFLOW
Some values were too large to be represented in(1,8) the returned
struct.
CONFORMING TO
Solaris, Irix, POSIX 1003.1-2001
NOTES
The Linux kernel has system calls statfs, fstatfs to support this
library call.
The current glibc implementation of
pathconf(path, _PC_REC_XFER_ALIGN);
pathconf(path, _PC_ALLOC_SIZE_MIN);
pathconf(path, _PC_REC_MIN_XFER_SIZE);
uses the f_frsize, f_frsize, and f_bsize fields of the return value of
statvfs(path,buf).
SEE ALSO
statfs(2)
Linux 2.6.0 2003-08-22 STATVFS(2)