int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf);
DESCRIPTION
statfs
returns information about a mounted file system.
path
is the path name of any file within the mounted filesystem.
buf
is a pointer to a
statfs
structure defined as follows:
struct statfs {
long f_type; /* type of filesystem (see below) */
long f_bsize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
long f_namelen; /* maximum length of filenames */
long f_spare[6]; /* spare for later */
};
File system types:
linux/affs_fs.h:
AFFS_SUPER_MAGIC 0xADFF
linux/efs_fs.h:
EFS_SUPER_MAGIC 0x00414A53
linux/ext_fs.h:
EXT_SUPER_MAGIC 0x137D
linux/ext2_fs.h:
EXT2_OLD_SUPER_MAGIC 0xEF51
EXT2_SUPER_MAGIC 0xEF53
linux/hpfs_fs.h:
HPFS_SUPER_MAGIC 0xF995E849
linux/iso_fs.h:
ISOFS_SUPER_MAGIC 0x9660
linux/minix_fs.h:
MINIX_SUPER_MAGIC 0x137F /* orig. minix */
MINIX_SUPER_MAGIC2 0x138F /* 30 char minix */
MINIX2_SUPER_MAGIC 0x2468 /* minix V2 */
MINIX2_SUPER_MAGIC2 0x2478 /* minix V2, 30 char names */
linux/msdos_fs.h:
MSDOS_SUPER_MAGIC 0x4d44
linux/ncp_fs.h:
NCP_SUPER_MAGIC 0x564c
linux/nfs_fs.h:
NFS_SUPER_MAGIC 0x6969
linux/proc_fs.h:
PROC_SUPER_MAGIC 0x9fa0
linux/smb_fs.h:
SMB_SUPER_MAGIC 0x517B
linux/sysv_fs.h:
XENIX_SUPER_MAGIC 0x012FF7B4
SYSV4_SUPER_MAGIC 0x012FF7B5
SYSV2_SUPER_MAGIC 0x012FF7B6
COH_SUPER_MAGIC 0x012FF7B7
linux/ufs_fs.h:
UFS_MAGIC 0x00011954
linux/xfs_fs.h:
XFS_SUPER_MAGIC 0x58465342
linux/xia_fs.h:
_XIAFS_SUPER_MAGIC 0x012FD16D
Fields that are undefined for a particular file system 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
For
statfs:
ENOTDIR
A component of the path prefix of
path
is not a directory.
ENAMETOOLONG
path
is too long.
ENOENT
The file referred to by
path
does not exist.
EACCES
Search permission is denied for a component of the path prefix of
path.
ELOOP
Too many symbolic links were encountered in translating
path.
EFAULT
Buf
or
path
points to an invalid address.
EIO
An I/O error occurred while reading from or writing to the file
system.
ENOMEM
Insufficient kernel memory was available.
ENOSYS
The filesystem
path
is on does not support
statfs.
For
fstatfs:
EBADF
fd
is not a valid open file descriptor.
EFAULT
buf
points to an invalid address.
EIO
An I/O error occurred while reading from or writing to the file
system.
ENOSYS
The filesystem
fd
is open on does not support
statfs.
CONFORMING TO
The Linux
statfs
was inspired by the 4.4BSD one
(but they do not use the same structure).