statvfs(2) -- Linux man page

NAME

SYNOPSIS

int statvfs(const char *path, struct statvfs *buf);
int fstatvfs(int fd, struct statvfs *buf);  

DESCRIPTION

  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

Setuid/setgid 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

ERRORS

EBADF

(fstatvfs) fd is not a valid open file descriptor.

EACCES

(statvfs) Search permission is denied for a component of the path prefix of path.

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.

ENOTDIR

(statvfs) A component of the path prefix of path is not a directory.

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.

ENOMEM

Insufficient kernel memory was available.

ENOSYS

The file system does not support this call.

EOVERFLOW

Some values were too large to be represented in the returned struct.

CONFORMING TO

NOTES

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