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STATVFS(2) Linux Programmer's Manual STATVFS(2)
NAME
statvfs, fstatvfs - get file 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 system. path is
the pathname of any file within the mounted filesystem. buf is a pointer to a
statvfs structure defined approximately as follows:
struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_t f_blocks; /* size of fs in f_frsize units */
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 system ID */
unsigned long f_flag; /* mount flags */
unsigned long f_namemax; /* maximum filename length */
};
Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>. Both used
to be unsigned long.
The field f_flag is a bit mask (of mount flags, see mount(8)). Bits defined by
POSIX are
ST_RDONLY
Read-only file system.
ST_NOSUID
Set-user-ID/set-group-ID bits are ignored by exec(2).
It is unspecified whether all members of the returned struct have meaningful values
on all filesystems.
fstatvfs() returns the same information about an open file referenced by descriptor
fd.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropri-
ately.
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 file descriptor.
EFAULT Buf or path points to an invalid address.
EINTR This call was interrupted by a signal.
EIO An I/O error occurred while reading from the file system.
ELOOP (statvfs()) Too many symbolic links were encountered in translating path.
ENAMETOOLONG
(statvfs()) path is too long.
ENOENT (statvfs()) The file referred to by path does not exist.
ENOMEM Insufficient kernel memory was available.
ENOSYS The file system does not support this call.
ENOTDIR
(statvfs()) A component of the path prefix of path is not a directory.
EOVERFLOW
Some values were too large to be represented in the returned struct.
CONFORMING TO
Solaris, Irix, POSIX.1-2001
NOTES
The Linux kernel has system calls statfs() and 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)
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Under GNU General Public License
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