getvfsbyname(3) [freebsd man page]

GETVFSBYNAME(3) 					   BSD Library Functions Manual 					   GETVFSBYNAME(3)

NAME

     getvfsbyname -- get information about a file system

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>

     int
     getvfsbyname(const char *name, struct xvfsconf *vfc);

DESCRIPTION

     The getvfsbyname() function provides access to information about a file system module that is configured in the kernel.  If successful, the
     requested file system xvfsconf is returned in the location pointed to by vfc.  The fields in a ``struct xvfsconf'' are defined as follows:

     vfc_name	   the name of the file system
     vfc_typenum   the file system type number assigned by the kernel
     vfc_refcount  the number of active mount points using the file system
     vfc_flags	   flag bits, as described below

     The flags are defined as follows:

     VFCF_STATIC      statically compiled into kernel
     VFCF_NETWORK     may get data over the network
     VFCF_READONLY    writes are not implemented
     VFCF_SYNTHETIC   data does not represent real files
     VFCF_LOOPBACK    aliases some other mounted FS
     VFCF_UNICODE     stores file names as Unicode
     VFCF_JAIL	      can be mounted from within a jail if security.jail.mount_allowed sysctl is set to 1
     VFCF_DELEGADMIN  supports delegated administration if vfs.usermount sysctl is set to 1

RETURN VALUES

     The getvfsbyname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS

     The following errors may be reported:

     [EFAULT]		The vfc argument points to an invalid address.

     [ENOENT]		The name argument specifies a file system that is unknown or not configured in the kernel.

SEE ALSO

     jail(2), mount(2), sysctl(3), jail(8), mount(8), sysctl(8)

HISTORY

     A variant of the getvfsbyname() function first appeared in FreeBSD 2.0.

BSD
								   April 5, 2007							       BSD

Check Out this Related Man Page

VFS_SET(9)						   BSD Kernel Developer's Manual						VFS_SET(9)

NAME

     VFS_SET -- set up loadable file system vfsconf

SYNOPSIS

     #include <sys/param.h>
     #include <sys/kernel.h>
     #include <sys/module.h>
     #include <sys/mount.h>

     void
     VFS_SET(struct vfsops *vfsops, fsname, int flags);

DESCRIPTION

     VFS_SET() creates a vfsconf structure for the loadable module with the given vfsops, fsname and flags, and declares it by calling
     DECLARE_MODULE(9) using vfs_modevent() as the event handler.

     Possible values for the flags argument are:

     VFCF_STATIC      File system should be statically available in the kernel.

     VFCF_NETWORK     Network exportable file system.

     VFCF_READONLY    Does not support write operations.

     VFCF_SYNTHETIC   Pseudo file system, data does not represent on-disk files.

     VFCF_LOOPBACK    Loopback file system layer.

     VFCF_UNICODE     File names are stored as Unicode.

     VFCF_JAIL	      Can be mounted from within a jail if security.jail.mount_allowed sysctl is set to 1.

     VFCF_DELEGADMIN  Supports delegated administration if vfs.usermount sysctl is set to 1.

     VFCF_SBDRY       When in VFS method, the thread suspension is deferred to the user boundary upon arrival of stop action.

PSEUDOCODE

     /*
      * Fill in the fields for which we have special methods.
      * The others are initially null.	This tells vfs to change them to
      * pointers to vfs_std* functions during file system registration.
      */
     static struct vfsops myfs_vfsops = {
	     .vfs_mount =    myfs_mount,
	     .vfs_root =     myfs_root,
	     .vfs_statfs =   myfs_statfs,
	     .vfs_unmount =  myfs_unmount,
     };

     VFS_SET(myfs_vfsops, myfs, 0);

SEE ALSO

     jail(2), jail(8), DECLARE_MODULE(9), vfs_modevent(9), vfsconf(9)

AUTHORS

     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD
								 February 21, 2013							       BSD

Linux and UNIX Man Pages

getvfsbyname(3) [freebsd man page]

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