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fstatfs(2freebsd)

February 13, 2017

freebsd-manpages

Manual pages for a GNU/kFreeBSD system

NAME

statfs - get file system statistics

LIBRARY


.Lb libc

SYNOPSIS


.In sys/param.h
.In 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
.Vt 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 */ };
The flags that may be returned include:
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).
Fields that are undefined for a particular file system are set to -1. The fstatfs system call returns the same information about an open file referenced by descriptor fd.

RETURN VALUES


.Rv -std

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.
The fstatfs system call fails if one or more of the following are true:
[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.

HISTORY

The statfs system call first appeared in BSD 4.4 .
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