getvfsbyname3
Get information about a file system
Usage
#include <sys/param.h>
#include <sys/mount.h>
int
getvfsbyname(const char *name, struct xvfsconf *vfc);
Library
Standard C Library (libc, -lc)
Overview
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 allow.mount and allow.mount.<vfc_name> jail parameters are set
- 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:
- [ENOENT]
-
The name argument specifies a file system that is unknown or not configured in the kernel.
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 49 times.