NAME
statfs — get file system statisticsLIBRARY
Standard C Library (libc, -lc)SYNOPSIS
#include <sys/param.h>#include <sys/mount.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 file system. The path argument is the path name of any file within the mounted file system. The buf argument is a pointer to a statfs structure defined as follows:
typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
/*
* filesystem statistics
*/
#define MFSNAMELEN 16 /* length of type name including null */
#define MNAMELEN 1024 /* size of on/from name bufs */
#define STATFS_VERSION 0x20140518 /* current version number */
struct statfs {
uint32_t f_version; /* structure version number */
uint32_t f_type; /* type of filesystem */
uint64_t f_flags; /* copy of mount exported flags */
uint64_t f_bsize; /* filesystem fragment size */
uint64_t f_iosize; /* optimal transfer block size */
uint64_t f_blocks; /* total data blocks in filesystem */
uint64_t f_bfree; /* free blocks in filesystem */
int64_t f_bavail; /* free blocks avail to non-superuser */
uint64_t f_files; /* total file nodes in filesystem */
int64_t f_ffree; /* free nodes avail to non-superuser */
uint64_t f_syncwrites; /* count of sync writes since mount */
uint64_t f_asyncwrites; /* count of async writes since mount */
uint64_t f_syncreads; /* count of sync reads since mount */
uint64_t f_asyncreads; /* count of async reads since mount */
uint64_t f_spare[10]; /* unused spare */
uint32_t f_namemax; /* maximum filename length */
uid_t f_owner; /* user that mounted the filesystem */
fsid_t f_fsid; /* filesystem id */
char f_charspare[80]; /* spare string space */
char f_fstypename[MFSNAMELEN]; /* filesystem type name */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
};
MNT_RDONLY- The file system is mounted read-only; Even the super-user may not write on it.
MNT_NOEXEC- Files may not be executed from the file system.
MNT_NOSUID- Setuid and setgid bits on files are not honored when they are executed.
MNT_SYNCHRONOUS- All I/O to the file system is done synchronously.
MNT_ASYNC- No file system I/O is done synchronously.
MNT_SOFTDEP- Soft updates being done (see ffs(7)).
MNT_GJOURNAL- Journaling with gjournal is enabled (see gjournal(8)).
MNT_SUIDDIR- Special handling of SUID bit on directories.
MNT_UNION- Union with underlying file system.
MNT_NOSYMFOLLOW- Symbolic links are not followed.
MNT_NOCLUSTERR- Read clustering is disabled.
MNT_NOCLUSTERW- Write clustering is disabled.
MNT_MULTILABEL- Mandatory Access Control (MAC) support for individual objects (see mac(4)).
MNT_ACLS- Access Control List (ACL) support enabled.
MNT_LOCAL- The file system resides locally.
MNT_QUOTA- The file system has quotas enabled on it.
MNT_ROOTFS- Identifies the root file system.
MNT_EXRDONLY- The file system is exported read-only.
MNT_NOATIME- Updating of file access times is disabled.
MNT_USER- The file system has been mounted by a user.
MNT_EXPORTED- The file system is exported for both reading and writing.
MNT_DEFEXPORTED- The file system is exported for both reading and writing to any Internet host.
MNT_EXPORTANON- The file system maps all remote accesses to the anonymous user.
MNT_EXKERB- The file system is exported with Kerberos uid mapping.
MNT_EXPUBLIC- The file system is exported publicly (WebNFS).
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.ERRORS
The statfs() system call fails if one or more of the following are true:- [
ENOTDIR] - A component of the path prefix of path is not a directory.
- [
ENAMETOOLONG] - The length of a component of path exceeds 255 characters, or the length of path exceeds 1023 characters.
- [
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] - The buf or path argument points to an invalid address.
- [
EIO] - An I/O error occurred while reading from or writing to the file system.
- [
EINTEGRITY] - Corrupted data was detected while reading from the file system.
- [
EBADF] - The fd argument is not a valid open file descriptor.
- [
EFAULT] - The buf argument points to an invalid address.
- [
EIO] - An I/O error occurred while reading from or writing to the file system.
- [
EINTEGRITY] - Corrupted data was detected while reading from the file system.
SEE ALSO
fhstatfs(2), getfsstat(2)HISTORY
The statfs() system call first appeared in 4.4BSD.| March 30, 2020 | Debian |