VFS_SUSER(9) BSD Kernel Developer's Manual VFS_SUSER(9)NAME
vfs_suser -- check if credentials have superuser privileges for a mount point
SYNOPSIS
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
int
vfs_suser(struct mount *mp, struct thread *td);
DESCRIPTION
The vfs_suser() function checks if the credentials given include superuser powers for the given mount point. It will check to see if the
thread passed in has the same credentials as the user that mounted the file system. If so, it returns 0, otherwise it returns what
priv_check(9) would have returned.
RETURN VALUES
The vfs_suser() function returns 0 if the user has superuser powers and EPERM otherwise. This is the reverse logic of some other implementa-
tions of suser() in which a TRUE response indicates superuser powers.
SEE ALSO chroot(2), jail(2)HISTORY
The vfs_suser() function was introduced in FreeBSD 5.2.
AUTHORS
This manual page was written by Alfred Perlstein.
BSD April 2, 2004 BSD
Check Out this Related Man Page
VFS_STATFS(9) BSD Kernel Developer's Manual VFS_STATFS(9)NAME
VFS_STATFS -- return file system status
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/vnode.h>
int
VFS_STATFS(struct mount *mp, struct statfs *sbp);
DESCRIPTION
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.
SEE ALSO VFS(9), vnode(9)AUTHORS
This manual page was written by Doug Rabson.
BSD May 23, 2009 BSD
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