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STATFS(2)		   Linux Programmer's Manual		     STATFS(2)

NAME
       statfs, fstatfs - get filesystem statistics

SYNOPSIS
       #include <sys/vfs.h>    /* or <sys/statfs.h> */

       int statfs(const char *path, struct statfs *buf);
       int fstatfs(int fd, struct statfs *buf);

DESCRIPTION
       The  statfs()  system call returns information about a mounted filesys‐
       tem.  path is the pathname of any file within the  mounted  filesystem.
       buf  is	a  pointer to a statfs structure defined approximately as fol‐
       lows:

	   struct statfs {
	       __fsword_t f_type;    /* Type of filesystem (see below) */
	       __fsword_t f_bsize;   /* Optimal transfer block size */
	       fsblkcnt_t f_blocks;  /* Total data blocks in filesystem */
	       fsblkcnt_t f_bfree;   /* Free blocks in filesystem */
	       fsblkcnt_t f_bavail;  /* Free blocks available to
					unprivileged user */
	       fsfilcnt_t f_files;   /* Total file nodes in filesystem */
	       fsfilcnt_t f_ffree;   /* Free file nodes in filesystem */
	       fsid_t	  f_fsid;    /* Filesystem ID */
	       __fsword_t f_namelen; /* Maximum length of filenames */
	       __fsword_t f_frsize;  /* Fragment size (since Linux 2.6) */
	       __fsword_t f_flags;   /* Mount flags of filesystem
					(since Linux 2.6.36) */
	       __fsword_t f_spare[xxx];
			       /* Padding bytes reserved for future use */
	   };

       The following filesystem types may appear in f_type:

	   ADFS_SUPER_MAGIC	 0xadf5
	   AFFS_SUPER_MAGIC	 0xadff
	   AFS_SUPER_MAGIC	 0x5346414f
	   ANON_INODE_FS_MAGIC	 0x09041934 /* Anonymous inode FS (for
					       pseudofiles that have no name;
					       e.g., epoll, signalfd, bpf) */
	   AUTOFS_SUPER_MAGIC	 0x0187
	   BDEVFS_MAGIC		 0x62646576
	   BEFS_SUPER_MAGIC	 0x42465331
	   BFS_MAGIC		 0x1badface
	   BINFMTFS_MAGIC	 0x42494e4d
	   BPF_FS_MAGIC		 0xcafe4a11
	   BTRFS_SUPER_MAGIC	 0x9123683e
	   BTRFS_TEST_MAGIC	 0x73727279
	   CGROUP_SUPER_MAGIC	 0x27e0eb   /* Cgroup pseudo FS */
	   CGROUP2_SUPER_MAGIC	 0x63677270 /* Cgroup v2 pseudo FS */
	   CIFS_MAGIC_NUMBER	 0xff534d42
	   CODA_SUPER_MAGIC	 0x73757245
	   COH_SUPER_MAGIC	 0x012ff7b7
	   CRAMFS_MAGIC		 0x28cd3d45
	   DEBUGFS_MAGIC	 0x64626720
	   DEVFS_SUPER_MAGIC	 0x1373	    /* Linux 2.6.17 and earlier */
	   DEVPTS_SUPER_MAGIC	 0x1cd1
	   ECRYPTFS_SUPER_MAGIC	 0xf15f
	   EFIVARFS_MAGIC	 0xde5e81e4
	   EFS_SUPER_MAGIC	 0x00414a53
	   EXT_SUPER_MAGIC	 0x137d	    /* Linux 2.0 and earlier */
	   EXT2_OLD_SUPER_MAGIC	 0xef51
	   EXT2_SUPER_MAGIC	 0xef53
	   EXT3_SUPER_MAGIC	 0xef53
	   EXT4_SUPER_MAGIC	 0xef53
	   F2FS_SUPER_MAGIC	 0xf2f52010
	   FUSE_SUPER_MAGIC	 0x65735546
	   FUTEXFS_SUPER_MAGIC	 0xbad1dea  /* Unused */
	   HFS_SUPER_MAGIC	 0x4244
	   HOSTFS_SUPER_MAGIC	 0x00c0ffee
	   HPFS_SUPER_MAGIC	 0xf995e849
	   HUGETLBFS_MAGIC	 0x958458f6
	   ISOFS_SUPER_MAGIC	 0x9660
	   JFFS2_SUPER_MAGIC	 0x72b6
	   JFS_SUPER_MAGIC	 0x3153464a
	   MINIX_SUPER_MAGIC	 0x137f	    /* original minix FS */
	   MINIX_SUPER_MAGIC2	 0x138f	    /* 30 char minix FS */
	   MINIX2_SUPER_MAGIC	 0x2468	    /* minix V2 FS */
	   MINIX2_SUPER_MAGIC2	 0x2478	    /* minix V2 FS, 30 char names */
	   MINIX3_SUPER_MAGIC	 0x4d5a	    /* minix V3 FS, 60 char names */
	   MQUEUE_MAGIC		 0x19800202 /* POSIX message queue FS */
	   MSDOS_SUPER_MAGIC	 0x4d44
	   MTD_INODE_FS_MAGIC	 0x11307854
	   NCP_SUPER_MAGIC	 0x564c
	   NFS_SUPER_MAGIC	 0x6969
	   NILFS_SUPER_MAGIC	 0x3434
	   NSFS_MAGIC		 0x6e736673
	   NTFS_SB_MAGIC	 0x5346544e
	   OCFS2_SUPER_MAGIC	 0x7461636f
	   OPENPROM_SUPER_MAGIC	 0x9fa1
	   OVERLAYFS_SUPER_MAGIC 0x794c7630
	   PIPEFS_MAGIC		 0x50495045
	   PROC_SUPER_MAGIC	 0x9fa0	    /* /proc FS */
	   PSTOREFS_MAGIC	 0x6165676c
	   QNX4_SUPER_MAGIC	 0x002f
	   QNX6_SUPER_MAGIC	 0x68191122
	   RAMFS_MAGIC		 0x858458f6
	   REISERFS_SUPER_MAGIC	 0x52654973
	   ROMFS_MAGIC		 0x7275
	   SECURITYFS_MAGIC	 0x73636673
	   SELINUX_MAGIC	 0xf97cff8c
	   SMACK_MAGIC		 0x43415d53
	   SMB_SUPER_MAGIC	 0x517b
	   SOCKFS_MAGIC		 0x534f434b
	   SQUASHFS_MAGIC	 0x73717368
	   SYSFS_MAGIC		 0x62656572
	   SYSV2_SUPER_MAGIC	 0x012ff7b6
	   SYSV4_SUPER_MAGIC	 0x012ff7b5
	   TMPFS_MAGIC		 0x01021994
	   TRACEFS_MAGIC	 0x74726163
	   UDF_SUPER_MAGIC	 0x15013346
	   UFS_MAGIC		 0x00011954
	   USBDEVICE_SUPER_MAGIC 0x9fa2
	   V9FS_MAGIC		 0x01021997
	   VXFS_SUPER_MAGIC	 0xa501fcf5
	   XENFS_SUPER_MAGIC	 0xabba1974
	   XENIX_SUPER_MAGIC	 0x012ff7b4
	   XFS_SUPER_MAGIC	 0x58465342
	   _XIAFS_SUPER_MAGIC	 0x012fd16d /* Linux 2.0 and earlier */

       Most    of     these	MAGIC	  constants	are	defined	    in
       /usr/include/linux/magic.h, and some are hardcoded in kernel sources.

       The  f_flags  field  is	a  bit	mask  indicating mount options for the
       filesystem.  It contains zero or more of the following bits:

       ST_MANDLOCK
	      Mandatory locking is permitted on the filesystem (see fcntl(2)).

       ST_NOATIME
	      Do not update access times; see mount(2).

       ST_NODEV
	      Disallow access to device special files on this filesystem.

       ST_NODIRATIME
	      Do not update directory access times; see mount(2).

       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) 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).

       ST_SYNCHRONOUS
	      Writes  are  synched  to	the  filesystem	 immediately  (see the
	      description of O_SYNC in open(2)).

       Nobody knows what f_fsid is supposed to contain (but see below).

       Fields that are undefined for a particular filesystem are set to 0.

       fstatfs() 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 appropriately.

ERRORS
       EACCES (statfs()) Search permission is denied for a  component  of  the
	      path prefix of path.  (See also path_resolution(7).)

       EBADF  (fstatfs()) fd is not a valid open file descriptor.

       EFAULT buf or path points to an invalid address.

       EINTR  The call was interrupted by a signal; see signal(7).

       EIO    An I/O error occurred while reading from the filesystem.

       ELOOP  (statfs()) Too many symbolic links were encountered in translat‐
	      ing path.

       ENAMETOOLONG
	      (statfs()) path is too long.

       ENOENT (statfs()) The file referred to by path does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The filesystem does not support this call.

       ENOTDIR
	      (statfs()) 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
       Linux-specific.	The Linux statfs() was inspired by the 4.4BSD one (but
       they do not use the same structure).

NOTES
       The  __fsword_t	type  used  for various fields in the statfs structure
       definition is a glibc internal type, not intended for public use.  This
       leaves  the  programmer	in a bit of a conundrum when trying to copy or
       compare	these  fields  to  local  variables  in	 a   program.	 Using
       unsigned int for such variables suffices on most systems.

       The  original  Linux  statfs()  and  fstatfs()  system  calls  were not
       designed with extremely large file sizes in mind.  Subsequently,	 Linux
       2.6 added new statfs64() and fstatfs64() system calls that employ a new
       structure, statfs64.  The new structure contains the same fields as the
       original	 statfs	 structure,  but  the  sizes  of  various  fields  are
       increased, to accommodate large file sizes.   The  glibc	 statfs()  and
       fstatfs()  wrapper functions transparently deal with the kernel differ‐
       ences.

       Some  systems  have  only  <sys/vfs.h>,	 other	 systems   also	  have
       <sys/statfs.h>,	where  the  former  includes  the latter.  So it seems
       including the former is the best choice.

       LSB has deprecated the library calls statfs() and fstatfs()  and	 tells
       us to use statvfs(2) and fstatvfs(2) instead.

   The f_fsid field
       Solaris,	 Irix  and  POSIX have a system call statvfs(2) that returns a
       struct statvfs (defined in <sys/statvfs.h>) containing an unsigned long
       f_fsid.	 Linux,	 SunOS, HP-UX, 4.4BSD have a system call statfs() that
       returns a struct statfs (defined in <sys/vfs.h>)	 containing  a	fsid_t
       f_fsid,	where  fsid_t  is defined as struct { int val[2]; }.  The same
       holds for FreeBSD, except that it uses the include file <sys/mount.h>.

       The general idea is that f_fsid contains some random  stuff  such  that
       the  pair (f_fsid,ino) uniquely determines a file.  Some operating sys‐
       tems use (a variation on) the device number, or the device number  com‐
       bined  with  the	 filesystem  type.  Several operating systems restrict
       giving out the f_fsid field to the superuser  only  (and	 zero  it  for
       unprivileged  users),  because  this field is used in the filehandle of
       the filesystem when NFS-exported, and giving it out is a security  con‐
       cern.

       Under  some operating systems, the fsid can be used as the second argu‐
       ment to the sysfs(2) system call.

BUGS
       From Linux 2.6.38 up to and including Linux 3.1, fstatfs() failed  with
       the error ENOSYS for file descriptors created by pipe(2).

SEE ALSO
       stat(2), statvfs(3), path_resolution(7)

COLOPHON
       This  page  is  part of release 4.14 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       https://www.kernel.org/doc/man-pages/.

Linux				  2017-09-15			     STATFS(2)
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