NetBSD/sys/fs/sysvbfs/sysvbfs.c
hannken 1b9c6382e3 New file system suspension API to replace vn_start_write and vn_finished_write.
The suspension helpers are now put into file system specific operations.
This means every file system not supporting these helpers cannot be suspended
and therefore snapshots are no longer possible.

Implemented for file systems of type ffs.

The new API is enabled on a kernel option NEWVNGATE.  This option is
not enabled by default in any kernel config.

Presented and discussed on tech-kern with much input from
Bill Studenmund <wrstuden@netbsd.org> and YAMAMOTO Takashi <yamt@netbsd.org>.

Welcome to 4.99.9 (new vfs op vfs_suspendctl).
2007-01-19 14:49:08 +00:00

141 lines
5.4 KiB
C

/* $NetBSD: sysvbfs.c,v 1.4 2007/01/19 14:49:10 hannken Exp $ */
/*-
* Copyright (c) 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sysvbfs.c,v 1.4 2007/01/19 14:49:10 hannken Exp $");
#include <sys/resource.h>
#include <sys/param.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/genfs/genfs_node.h>
#include <fs/sysvbfs/sysvbfs.h>
/* External interfaces */
int (**sysvbfs_vnodeop_p)(void *); /* filled by getnewvnode (vnode.h) */
const struct vnodeopv_entry_desc sysvbfs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, sysvbfs_lookup }, /* lookup */
{ &vop_create_desc, sysvbfs_create }, /* create */
{ &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */
{ &vop_open_desc, sysvbfs_open }, /* open */
{ &vop_close_desc, sysvbfs_close }, /* close */
{ &vop_access_desc, sysvbfs_access }, /* access */
{ &vop_getattr_desc, sysvbfs_getattr }, /* getattr */
{ &vop_setattr_desc, sysvbfs_setattr }, /* setattr */
{ &vop_read_desc, sysvbfs_read }, /* read */
{ &vop_write_desc, sysvbfs_write }, /* write */
{ &vop_lease_desc, genfs_lease_check }, /* lease */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */
{ &vop_poll_desc, genfs_poll }, /* poll */
{ &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, genfs_revoke }, /* revoke */
{ &vop_mmap_desc, genfs_mmap }, /* mmap */
{ &vop_fsync_desc, sysvbfs_fsync }, /* fsync */
{ &vop_seek_desc, genfs_seek }, /* seek */
{ &vop_remove_desc, sysvbfs_remove }, /* remove */
{ &vop_link_desc, genfs_eopnotsupp }, /* link */
{ &vop_rename_desc, sysvbfs_rename }, /* rename */
{ &vop_mkdir_desc, genfs_eopnotsupp }, /* mkdir */
{ &vop_rmdir_desc, genfs_eopnotsupp }, /* rmdir */
{ &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */
{ &vop_readdir_desc, sysvbfs_readdir }, /* readdir */
{ &vop_readlink_desc, genfs_eopnotsupp }, /* readlink */
{ &vop_abortop_desc, genfs_abortop }, /* abortop */
{ &vop_inactive_desc, sysvbfs_inactive }, /* inactive */
{ &vop_reclaim_desc, sysvbfs_reclaim }, /* reclaim */
{ &vop_lock_desc, genfs_lock }, /* lock */
{ &vop_unlock_desc, genfs_unlock }, /* unlock */
{ &vop_bmap_desc, sysvbfs_bmap }, /* bmap */
{ &vop_strategy_desc, sysvbfs_strategy }, /* strategy */
{ &vop_print_desc, sysvbfs_print }, /* print */
{ &vop_islocked_desc, genfs_islocked }, /* islocked */
{ &vop_pathconf_desc, sysvbfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, sysvbfs_advlock }, /* advlock */
{ &vop_bwrite_desc, vn_bwrite }, /* bwrite */
{ &vop_getpages_desc, genfs_getpages }, /* getpages */
{ &vop_putpages_desc, genfs_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc sysvbfs_vnodeop_opv_desc = {
&sysvbfs_vnodeop_p,
sysvbfs_vnodeop_entries
};
const struct vnodeopv_desc *sysvbfs_vnodeopv_descs[] = {
&sysvbfs_vnodeop_opv_desc,
NULL,
};
const struct genfs_ops sysvbfs_genfsops = {
.gop_size = genfs_size,
.gop_alloc = sysvbfs_gop_alloc,
.gop_write = genfs_gop_write,
};
struct vfsops sysvbfs_vfsops = {
MOUNT_SYSVBFS,
sysvbfs_mount,
sysvbfs_start,
sysvbfs_unmount,
sysvbfs_root,
sysvbfs_quotactl,
sysvbfs_statvfs,
sysvbfs_sync,
sysvbfs_vget,
sysvbfs_fhtovp,
sysvbfs_vptofh,
sysvbfs_init,
sysvbfs_reinit,
sysvbfs_done,
NULL, /* vfs_mountroot */
(int (*)(struct mount *, struct vnode *, struct timespec *))
eopnotsupp, /* snapshot */
vfs_stdextattrctl,
vfs_stdsuspendctl,
sysvbfs_vnodeopv_descs,
0,
{ NULL, NULL }
};
VFS_ATTACH(sysvbfs_vfsops);