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STATFS(2)                DragonFly System Calls Manual               STATFS(2)


statfs, fstatfs -- get file system statistics


Standard C Library (libc, -lc)


#include <sys/param.h> #include <sys/mount.h> int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf);


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: 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 90 /* length of buffer for returned name */ struct statfs { 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 */ int f_flags; /* copy of mount exported 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 */ char f_mntfromname[MNAMELEN];/* mounted filesystem */ }; 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 file system are set to -1. Fstatfs() returns the same information about an open file referenced by descriptor fd.


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.


Statfs() 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] Buf or path points to an invalid address. [EIO] An I/O error occurred while reading from or writing to the file system. Fstatfs() fails if one or more of the following are true: [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.


stat(2), statvfs(2)


The statfs() function first appeared in 4.4BSD. DragonFly 4.3 September 28, 2008 DragonFly 4.3

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