statvfs(3) - Linux manual page (original) (raw)
statvfs(3) Library Functions Manual statvfs(3)
NAME top
statvfs, fstatvfs - get filesystem statisticsLIBRARY top
Standard C library (_libc_, _-lc_)SYNOPSIS top
**#include <sys/statvfs.h>**
**int statvfs(const char *restrict** _path_**, struct statvfs *restrict** _buf_**);**
**int fstatvfs(int** _fd_**, struct statvfs ***_buf_**);**DESCRIPTION top
The function **statvfs**() returns information about a mounted
filesystem. _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; /* Filesystem block size */
unsigned long f_frsize; /* Fragment size */
fsblkcnt_t f_blocks; /* Size of fs in f_frsize units */
fsblkcnt_t f_bfree; /* Number of free blocks */
fsblkcnt_t f_bavail; /* Number of free blocks for
unprivileged users */
fsfilcnt_t f_files; /* Number of inodes */
fsfilcnt_t f_ffree; /* Number of free inodes */
fsfilcnt_t f_favail; /* Number of free inodes for
unprivileged users */
unsigned long f_fsid; /* Filesystem ID */
unsigned long f_flag; /* Mount flags */
unsigned long f_namemax; /* Maximum filename length */
};
Here the types _fsblkcntt_ and _fsfilcntt_ are defined in
_<sys/types.h>_. Both used to be _unsigned long_.
The field _fflag_ is a bit mask indicating various options that
were employed when mounting this filesystem. It contains zero or
more of the following flags:
**ST_MANDLOCK**
Mandatory locking is permitted on the filesystem (see
[fcntl(2)](../man2/fcntl.2.html)).
**ST_NOATIME**
Do not update access times; see [mount(2)](../man2/mount.2.html).
**ST_NODEV**
Disallow access to device special files on this filesystem.
**ST_NODIRATIME**
Do not update directory access times; see [mount(2)](../man2/mount.2.html).
**ST_NOEXEC**
Execution of programs is disallowed on this filesystem.
**ST_NOSUID**
The set-user-ID and set-group-ID bits are ignored by
[exec(3)](../man3/exec.3.html) for executable files on this filesystem
**ST_RDONLY**
This filesystem is mounted read-only.
**ST_RELATIME**
Update atime relative to mtime/ctime; see [mount(2)](../man2/mount.2.html).
**ST_SYNCHRONOUS**
Writes are synched to the filesystem immediately (see the
description of **O_SYNC** in [open(2)](../man2/open.2.html)).
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 top
On success, zero is returned. On error, -1 is returned, and _[errno](../man3/errno.3.html)_
is set to indicate the error.ERRORS top
**EACCES** (**statvfs**()) Search permission is denied for a component of
the path prefix of _path_. (See also [path_resolution(7)](../man7/path%5Fresolution.7.html).)
**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; see [signal(7)](../man7/signal.7.html).
**EIO** An I/O error occurred while reading from the filesystem.
**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 filesystem 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.ATTRIBUTES top
For an explanation of the terms used in this section, see
[attributes(7)](../man7/attributes.7.html).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ **Interface** │ **Attribute** │ **Value** │
├──────────────────────────────────────┼───────────────┼─────────┤
│ **statvfs**(), **fstatvfs**() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘VERSIONS top
Only the **ST_NOSUID** and **ST_RDONLY** flags of the _fflag_ field are
specified in POSIX.1. To obtain definitions of the remaining
flags, one must define **_GNU_SOURCE**.NOTES top
The Linux kernel has system calls [statfs(2)](../man2/statfs.2.html) and [fstatfs(2)](../man2/fstatfs.2.html) to
support this library call.
The glibc implementations of
pathconf(path, _PC_REC_XFER_ALIGN);
pathconf(path, _PC_ALLOC_SIZE_MIN);
pathconf(path, _PC_REC_MIN_XFER_SIZE);
respectively use the _ffrsize_, _ffrsize_, and _fbsize_ fields
returned by a call to **statvfs**() with the argument _path_.
Under Linux, _ffavail_ is always the same as _fffree_, and there's
no way for a filesystem to report otherwise. This is not an
issue, since no filesystems with an inode root reservation exist.STANDARDS top
POSIX.1-2008.HISTORY top
POSIX.1-2001.
Before glibc 2.13, **statvfs**() populated the bits of the _fflag_
field by scanning the mount options shown in _/proc/mounts_.
However, starting with Linux 2.6.36, the underlying [statfs(2)](../man2/statfs.2.html)
system call provides the necessary information via the _fflags_
field, and since glibc 2.13, the **statvfs**() function will use
information from that field rather than scanning _/proc/mounts_.SEE ALSO top
[statfs(2)](../man2/statfs.2.html)COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-07-23 statvfs(3)
Pages that refer to this page:ioctl_xfs_fscounts(2), statfs(2)