diff options
Diffstat (limited to 'share/examples/lkm/vfs/module')
| -rw-r--r-- | share/examples/lkm/vfs/module/Makefile | 71 | ||||
| -rw-r--r-- | share/examples/lkm/vfs/module/kernfsmod.c | 127 |
2 files changed, 198 insertions, 0 deletions
diff --git a/share/examples/lkm/vfs/module/Makefile b/share/examples/lkm/vfs/module/Makefile new file mode 100644 index 0000000..63055f9 --- /dev/null +++ b/share/examples/lkm/vfs/module/Makefile @@ -0,0 +1,71 @@ +# 05 Jun 93 +# +# Makefile for newsyscall +# +# 05 Jun 93 Terry Lambert Original +# +# Copyright (c) 1993 Terrence R. Lambert. +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# 3. All advertising materials mentioning features or use of this software +# must display the following acknowledgement: +# This product includes software developed by Terrence R. Lambert. +# 4. The name Terrence R. Lambert may not be used to endorse or promote +# products derived from this software without specific prior written +# permission. +# +# THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY +# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# + +SRCS=kernfsmod.c +OBJS=$(SRCS:.c=.o) + +KSRCS=/sys/miscfs/kernfs/kernfs_vfsops.c /sys/miscfs/kernfs/kernfs_vnops.c +KOBJS=kernfs_vfsops.o kernfs_vnops.o + +MODOBJ=combined.o + +KMOD=kernfsmod +CFLAGS= -DKERNEL -I/sys/sys -I/sys + +all: $(MODOBJ) + +clean: + rm -f $(OBJS) $(KOBJS) $(MODOBJ) $(KMOD) + +load: + /sbin/modload -o $(KMOD) -e$(KMOD) $(MODOBJ) + +unload: + /sbin/modunload -n $(KMOD) + +kernfs_vfsops.o: /sys/miscfs/kernfs/kernfs_vfsops.c + $(CC) $(CFLAGS) -c -O $@ $< + +kernfs_vnops.o: /sys/miscfs/kernfs/kernfs_vnops.c + $(CC) $(CFLAGS) -c -O $@ $< + +$(MODOBJ): $(OBJS) $(KOBJS) + $(LD) -r -o $(MODOBJ) $(OBJS) $(KOBJS) + +# +# EOF -- This file has not been truncated +# diff --git a/share/examples/lkm/vfs/module/kernfsmod.c b/share/examples/lkm/vfs/module/kernfsmod.c new file mode 100644 index 0000000..2a083f6 --- /dev/null +++ b/share/examples/lkm/vfs/module/kernfsmod.c @@ -0,0 +1,127 @@ +/* 05 Jun 93*/ +/* + * kernfsmod.c + * + * 05 Jun 93 Terry Lambert Original + * + * Copyright (c) 1993 Terrence R. Lambert. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Terrence R. Lambert. + * 4. The name Terrence R. Lambert may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ +#define printf I_HATE_ANSI +#include <stdio.h> +#undef printf +#include <stdlib.h> +#include <sys/param.h> +#include <sys/ioctl.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/mount.h> +#include <sys/exec.h> +#include <sys/lkm.h> +#include <a.out.h> +#include <sys/file.h> +#include <sys/errno.h> + +/* + * This is the vfsops table from /sys/miscfs/kernfs/kernfs_vfsops.c + */ +extern struct vfsops kernfs_vfsops; + +/* + * Currently, the mount system call is broken in the way it operates + * and the vfssw[] table does not have a character string identifier + * for the file system type; therefore, to remount a file system after + * it has been mounted in the first place, the offset into the table + * must be the same; this will be corrected in future patches, but + * not right now. At the same time the fstab format will need to + * change to allow definition without mount of file systems. + * + * The flags field is a parameter to the init; this could be used to + * change the file system operation: for instance, in ISOFS, this + * could be used to enable/disable Rockridge extensions. + */ +MOD_VFS("kernfs",MOUNT_KERNFS,0,&kernfs_vfsops) + +/* + * This function is called each time the module is loaded. Technically, + * we could have made this "nosys" in the "DISPATCH" in "kernfsmod()", + * but it's a convenient place to kick a copyright out to the console. + */ +static int +kernfsmod_load( lkmtp, cmd) +struct lkm_table *lkmtp; +int cmd; +{ + if( cmd == LKM_E_LOAD) { /* print copyright on console*/ + printf( "\nSample Loaded file system\n"); + printf( "Copyright (c) 1990, 1992 Jan-Simon Pendry\n"); + printf( "All rights reserved.\n"); + printf( "\nLoader stub and module loader is\n"); + printf( "Copyright (c) 1993\n"); + printf( "Terrence R. Lambert\n"); + printf( "All rights reserved\n"); + } + + return( 0); +} + + +/* + * External entry point; should generally match name of .o file. The + * arguments are always the same for all loaded modules. The "load", + * "unload", and "stat" functions in "DISPATCH" will be called under + * their respective circumstances unless their value is "nosys". If + * called, they are called with the same arguments (cmd is included to + * allow the use of a single function, ver is included for version + * matching between modules and the kernel loader for the modules). + * + * Since we expect to link in the kernel and add external symbols to + * the kernel symbol name space in a future version, generally all + * functions used in the implementation of a particular module should + * be static unless they are expected to be seen in other modules or + * to resolve unresolved symbols alread existing in the kernel (the + * second case is not likely to ever occur). + * + * The entry point should return 0 unless it is refusing load (in which + * case it should return an errno from errno.h). + */ +kernfsmod( lkmtp, cmd, ver) +struct lkm_table *lkmtp; +int cmd; +int ver; +{ + DISPATCH(lkmtp,cmd,ver,kernfsmod_load,nosys,nosys) +} + + +/* + * EOF -- This file has not been truncated. + */ |
