NetBSD/sys/miscfs/procfs/procfs_vfsops.c

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Apply the NFS exports list rototill patch: - Remove all NFS related stuff from file system specific code. - Drop the vfs_checkexp hook and generalize it in the new nfs_check_export function, thus removing redundancy from all file systems. - Move all NFS export-related stuff from kern/vfs_subr.c to the new file sys/nfs/nfs_export.c. The former was becoming large and its code is always compiled, regardless of the build options. Using the latter, the code is only compiled in when NFSSERVER is enabled. While doing this, also make some functions in nfs_subs.c conditional to NFSSERVER. - Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a path and a set of export entries. At the moment it can only clear the exports list or append entries, one by one, but it is done in a way that allows setting the whole set of entries atomically in the future (see the comment in mountd_set_exports_list or in doc/TODO). - Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so that it becomes file system agnostic. In fact, all this whole thing was done to remove a 'XXX' block from this utility! - Change the mount*, newfs and fsck* userland utilities to not deal with NFS exports initialization; done internally by the kernel when initializing the NFS support for each file system. - Implement an interface for VFS (called VFS hooks) so that several kernel subsystems can run arbitrary code upon receipt of specific VFS events. At the moment, this only provides support for unmount and is used to destroy NFS exports lists from the file systems being unmounted, though it has room for extension. Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments and advice in the development of this patch.
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/* $NetBSD: procfs_vfsops.c,v 1.62 2005/09/23 12:10:33 jmmv Exp $ */
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/*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
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* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
*/
/*
* Copyright (c) 1993 Jan-Simon Pendry
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* 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.
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* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
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*
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* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
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*/
/*
* procfs VFS interface
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*/
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#include <sys/cdefs.h>
Apply the NFS exports list rototill patch: - Remove all NFS related stuff from file system specific code. - Drop the vfs_checkexp hook and generalize it in the new nfs_check_export function, thus removing redundancy from all file systems. - Move all NFS export-related stuff from kern/vfs_subr.c to the new file sys/nfs/nfs_export.c. The former was becoming large and its code is always compiled, regardless of the build options. Using the latter, the code is only compiled in when NFSSERVER is enabled. While doing this, also make some functions in nfs_subs.c conditional to NFSSERVER. - Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a path and a set of export entries. At the moment it can only clear the exports list or append entries, one by one, but it is done in a way that allows setting the whole set of entries atomically in the future (see the comment in mountd_set_exports_list or in doc/TODO). - Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so that it becomes file system agnostic. In fact, all this whole thing was done to remove a 'XXX' block from this utility! - Change the mount*, newfs and fsck* userland utilities to not deal with NFS exports initialization; done internally by the kernel when initializing the NFS support for each file system. - Implement an interface for VFS (called VFS hooks) so that several kernel subsystems can run arbitrary code upon receipt of specific VFS events. At the moment, this only provides support for unmount and is used to destroy NFS exports lists from the file systems being unmounted, though it has room for extension. Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments and advice in the development of this patch.
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__KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.62 2005/09/23 12:10:33 jmmv Exp $");
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#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
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#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
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#include <sys/systm.h>
#include <sys/sysctl.h>
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#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <sys/dirent.h>
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#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
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#include <miscfs/procfs/procfs.h>
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#include <uvm/uvm_extern.h> /* for PAGE_SIZE */
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void procfs_init(void);
void procfs_reinit(void);
void procfs_done(void);
int procfs_mount(struct mount *, const char *, void *,
struct nameidata *, struct proc *);
int procfs_start(struct mount *, int, struct proc *);
int procfs_unmount(struct mount *, int, struct proc *);
int procfs_quotactl(struct mount *, int, uid_t, void *,
struct proc *);
int procfs_statvfs(struct mount *, struct statvfs *, struct proc *);
int procfs_sync(struct mount *, int, struct ucred *, struct proc *);
int procfs_vget(struct mount *, ino_t, struct vnode **);
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/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
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int
procfs_mount(mp, path, data, ndp, p)
struct mount *mp;
const char *path;
void *data;
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struct nameidata *ndp;
struct proc *p;
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{
struct procfsmount *pmnt;
struct procfs_args args;
int error;
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if (UIO_MX & (UIO_MX-1)) {
log(LOG_ERR, "procfs: invalid directory entry size");
return (EINVAL);
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}
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if (mp->mnt_flag & MNT_GETARGS) {
pmnt = VFSTOPROC(mp);
if (pmnt == NULL)
return EIO;
args.version = PROCFS_ARGSVERSION;
args.flags = pmnt->pmnt_flags;
return copyout(&args, data, sizeof(args));
}
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
if (data != NULL) {
error = copyin(data, &args, sizeof args);
if (error != 0)
return error;
if (args.version != PROCFS_ARGSVERSION)
return EINVAL;
} else
args.flags = 0;
pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
M_UFSMNT, M_WAITOK); /* XXX need new malloc type */
mp->mnt_stat.f_namemax = MAXNAMLEN;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = pmnt;
vfs_getnewfsid(mp);
error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE,
mp, p);
pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
pmnt->pmnt_flags = args.flags;
return error;
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}
/*
* unmount system call
*/
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int
procfs_unmount(mp, mntflags, p)
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struct mount *mp;
int mntflags;
struct proc *p;
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{
int error;
int flags = 0;
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if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
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if ((error = vflush(mp, 0, flags)) != 0)
return (error);
exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook);
free(mp->mnt_data, M_UFSMNT);
mp->mnt_data = 0;
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return (0);
}
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int
procfs_root(mp, vpp)
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struct mount *mp;
struct vnode **vpp;
{
return (procfs_allocvp(mp, vpp, 0, PFSroot, -1));
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}
/* ARGSUSED */
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int
procfs_start(mp, flags, p)
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struct mount *mp;
int flags;
struct proc *p;
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{
return (0);
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}
/*
* Get file system statistics.
*/
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int
procfs_statvfs(mp, sbp, p)
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struct mount *mp;
struct statvfs *sbp;
struct proc *p;
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{
sbp->f_bsize = PAGE_SIZE;
sbp->f_frsize = PAGE_SIZE;
sbp->f_iosize = PAGE_SIZE;
sbp->f_blocks = 1; /* avoid divide by zero in some df's */
sbp->f_bfree = 0;
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sbp->f_bavail = 0;
sbp->f_bresvd = 0;
sbp->f_files = maxproc; /* approx */
sbp->f_ffree = maxproc - nprocs; /* approx */
sbp->f_favail = maxproc - nprocs; /* approx */
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return (0);
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}
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/*ARGSUSED*/
int
procfs_quotactl(mp, cmds, uid, arg, p)
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struct mount *mp;
int cmds;
uid_t uid;
void *arg;
struct proc *p;
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{
return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
int
procfs_sync(mp, waitfor, uc, p)
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struct mount *mp;
int waitfor;
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struct ucred *uc;
struct proc *p;
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{
return (0);
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}
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/*ARGSUSED*/
int
procfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
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void
procfs_init()
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{
procfs_hashinit();
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}
void
procfs_reinit()
{
procfs_hashreinit();
}
void
procfs_done()
{
procfs_hashdone();
}
SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup")
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{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "procfs",
SYSCTL_DESCR("Process file system"),
NULL, 0, NULL, 0,
CTL_VFS, 12, CTL_EOL);
/*
* XXX the "12" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "12" is the order as taken from sys/mount.h
*/
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}
extern const struct vnodeopv_desc procfs_vnodeop_opv_desc;
const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = {
&procfs_vnodeop_opv_desc,
NULL,
};
struct vfsops procfs_vfsops = {
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MOUNT_PROCFS,
procfs_mount,
procfs_start,
procfs_unmount,
procfs_root,
procfs_quotactl,
procfs_statvfs,
procfs_sync,
procfs_vget,
Apply the NFS exports list rototill patch: - Remove all NFS related stuff from file system specific code. - Drop the vfs_checkexp hook and generalize it in the new nfs_check_export function, thus removing redundancy from all file systems. - Move all NFS export-related stuff from kern/vfs_subr.c to the new file sys/nfs/nfs_export.c. The former was becoming large and its code is always compiled, regardless of the build options. Using the latter, the code is only compiled in when NFSSERVER is enabled. While doing this, also make some functions in nfs_subs.c conditional to NFSSERVER. - Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a path and a set of export entries. At the moment it can only clear the exports list or append entries, one by one, but it is done in a way that allows setting the whole set of entries atomically in the future (see the comment in mountd_set_exports_list or in doc/TODO). - Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so that it becomes file system agnostic. In fact, all this whole thing was done to remove a 'XXX' block from this utility! - Change the mount*, newfs and fsck* userland utilities to not deal with NFS exports initialization; done internally by the kernel when initializing the NFS support for each file system. - Implement an interface for VFS (called VFS hooks) so that several kernel subsystems can run arbitrary code upon receipt of specific VFS events. At the moment, this only provides support for unmount and is used to destroy NFS exports lists from the file systems being unmounted, though it has room for extension. Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments and advice in the development of this patch.
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NULL, /* vfs_fhtovp */
NULL, /* vfs_vptofh */
procfs_init,
procfs_reinit,
procfs_done,
NULL, /* vfs_mountroot */
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
procfs_vnodeopv_descs,
};
VFS_ATTACH(procfs_vfsops);