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DESCRIPTION

typedef struct fsid { int32_t val[2]; } fsid_t;	/* file system id type */

/*
 * file system statistics
 */

#define MFSNAMELEN 16	/* length of fs type name, including null */
#define MNAMELEN   80	/* length of buffer for returned name */

struct statfs {
    long    f_spare2;		/* placeholder */
    long    f_bsize;		/* fundamental file system block size */
    long    f_iosize;		/* 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 */
    uid_t   f_owner;		/* user that mounted the filesystem */
    int     f_type;		/* type of filesystem (see below) */
    int     f_flags;		/* copy of mount flags */
    long    f_syncwrites;	/* count of sync writes since mount */
    long    f_asyncwrites;	/* count of async writes since mount */
    char    f_fstypename[MFSNAMELEN];/* fs type name */
    char    f_mntonname[MNAMELEN];/* directory on which mounted */
    long    f_syncreads;	/* count of sync reads since mount */
    long    f_asyncreads;	/* count of async reads since mount */
    short   f_spares1;		/* unused spare */
    char    f_mntfromname[MNAMELEN];/* mounted filesystem */
    short   f_spares2;		/* unused spare */
    long    f_spare[2];		/* unused spare */
};

The flags that may be returned include:

MNT_RDONLY

The filesystem is mounted read-only; Even the super-user may not write on it.

MNT_NOEXEC

Files may not be executed from the filesystem.

MNT_NOSUID

Setuid and setgid bits on files are not honored when they are executed.

MNT_NODEV

Special files in the filesystem may not be opened.

MNT_SYNCHRONOUS

All I/O to the filesystem is done synchronously.

MNT_ASYNC

No filesystem I/O is done synchronously.

MNT_LOCAL

The filesystem resides locally.

MNT_QUOTA

The filesystem has quotas enabled on it.

MNT_ROOTFS

Identifies the root filesystem.

MNT_EXRDONLY

The filesystem is exported read-only.

MNT_EXPORTED

The filesystem is exported for both reading and writing.

MNT_DEFEXPORTED

The filesystem is exported for both reading and writing to any Internet host.

MNT_EXPORTANON

The filesystem maps all remote accesses to the anonymous user.

MNT_EXKERB

The filesystem is exported with Kerberos uid mapping.

Fields that are undefined for a particular filesystem are set to -1. The buffer is filled with an array of fsstat structures, one for each mounted filesystem up to the size specified by bufsize.

If buf is given as NULL, getfsstat() returns just the number of mounted filesystems.

Normally flags should be specified as MNT_WAIT. If flags is set to MNT_NOWAIT, getfsstat() will return the information it has available without requesting an update from each filesystem. Thus, some of the information will be out of date, but getfsstat() will not block waiting for information from a filesystem that is unable to respond. Getvfsstat() returns extended information about all mounted filesystems. Note that vbufsize represents the size of vbuf, and buf is expected to be of contemporary size for its own structures.