gfsi.5

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)gfsi.5	8.1	9/11/90
.TH gfsi 5
.SH Name 
gfsi \- The Generic File System Interface
.SH Description
.NXR "gfsi file"
.NXR "Generic File System Interface"
.NXA "gfsi file" "NFS file"
.NXA "gfsi file" "UFS file"
.NXA "gfsi file" "getdirentries system call"
.NXA "gfsi file" "getmnt system call"
The Generic File System Interface (GFSI) is the interface
between the kernel and
specific file system implementations such as 
.PN ufs ,
the local ULTRIX file system and 
.PN nfs , 
the Network File System.
The Generic File System Interface has many performance improvements,
along with a complete reorganization of the
file system code.  The GFS interface
has been accomplished with modifications to both
the mount table,
.PN sys/mount.h
and to the inode, which under the GFS interface implementation
is referred to as the gnode.  The gnode is defined in the
.PN sys/gnode.h
and 
.PN sys/gnode_common.h .
.PP
The GFS interface allows superusers to
.PN mount 
and 
.PN umount
file systems on local and remote machines.
Changes to the
.PN /etc/fstab
file allow any type of mount to occur automatically at boot time in the
files 
.PN /etc/rc
and 
.PN /etc/rc.boot .
Other than mounting and unmounting file systems, users should not see
any difference in the local file system.
.PP
The GFS interface requires two system calls: 
.MS getmnt 2 
and 
.MS getdirentries 2 .
The 
.PN getmnt
system call handles generic mounted file system data.
The 
.PN getdirentries 
system call handles generic directory entries from any file system.
.SH See Also
getdirentries(2), getmnt(2), mount(2), fstab(5), nfs(5nfs), ufs(5),
fsck(8), mount(8)