VFS_STATFS —
return file system status
The
VFS_STATFS()
macro returns various pieces of information about the file system, including
recommended I/O sizes, free space, free inodes, etc.
The arguments it expects are:
- mp
- The file system.
- sbp
- A statfs structure, as defined by
<sys/mount.h>, into which
information is placed about the file system.
The fields of struct statfs related to the
file system are as follows:
- f_type
- Type of file system.
- f_flags
- A copy of mount exported flags.
- f_bsize
- Fragment size.
- f_iosize
- Optimal transfer block size.
- f_blocks
- The total number of data blocks in the file system.
- f_bfree
- The number of free blocks in the file system.
- f_bavail
- The number of free blocks available to non-superuser processes.
- f_files
- The total number of file nodes in the file system.
- f_ffree
- The number of free nodes available to non-superuser processes.
- f_syncwrites
- The number of synchronous writes since the file system was mounted.
- f_asyncwrites
- The number of asynchronous writes since the file system was mounted.
- f_syncreads
- The number of synchronous reads since the file system was mounted.
- f_asyncreads
- The number of asynchronous reads since the file system was mounted.
- f_namemax
- The maximum file name length for this file system.
- f_owner
- The user ID of the user that mounted the file system.
- f_fsid
- Unique file system ID.
- f_fstypename
- The file system type name; a string of at most
MFSNAMELEN bytes.
- f_mntfromname
- The device name the file system was mounted from; a string of at most
MNAMELEN bytes.
- f_mntonname
- The name of the directory on which the file system is mounted; a string of
at most
MNAMELEN bytes.
This manual page was written by Doug
Rabson.