8c21bc6224
- Not enabled by default. Needs kernel option FFS_SNAPSHOT.
- Change parameters of ffs_blkfree.
- Let the copy-on-write functions return an error so spec_strategy
may fail if the copy-on-write fails.
- Change genfs_*lock*() to use vp->v_vnlock instead of &vp->v_lock.
- Add flag B_METAONLY to VOP_BALLOC to return indirect block buffer.
- Add a function ffs_checkfreefile needed for snapshot creation.
- Add special handling of snapshot files:
Snapshots may not be opened for writing and the attributes are read-only.
Use the mtime as the time this snapshot was taken.
Deny mtime updates for snapshot files.
- Add function transferlockers to transfer any waiting processes from
one lock to another.
- Add vfsop VFS_SNAPSHOT to take a snapshot and make it accessible through
a vnode.
- Add snapshot support to ls, fsck_ffs and dump.
Welcome to 2.0F.
Approved by: Jason R. Thorpe <thorpej@netbsd.org>
387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
/* $NetBSD: procfs_vfsops.c,v 1.57 2004/05/25 14:54:57 hannken Exp $ */
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/*
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
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*/
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/*
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* Copyright (c) 1993 Jan-Simon Pendry
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
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*/
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/*
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* procfs VFS interface
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.57 2004/05/25 14:54:57 hannken Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#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>
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#include <sys/vnode.h>
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#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 __P((void));
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void procfs_reinit __P((void));
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void procfs_done __P((void));
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int procfs_mount __P((struct mount *, const char *, void *,
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struct nameidata *, struct proc *));
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int procfs_start __P((struct mount *, int, struct proc *));
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int procfs_unmount __P((struct mount *, int, struct proc *));
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int procfs_quotactl __P((struct mount *, int, uid_t, void *,
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struct proc *));
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int procfs_statvfs __P((struct mount *, struct statvfs *, struct proc *));
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int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
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int procfs_vget __P((struct mount *, ino_t, struct vnode **));
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int procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
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int procfs_checkexp __P((struct mount *, struct mbuf *, int *,
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struct ucred **));
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int procfs_vptofh __P((struct vnode *, struct fid *));
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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/* ARGSUSED */
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int
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procfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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const char *path;
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void *data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct procfsmount *pmnt;
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struct procfs_args args;
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int error;
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if (UIO_MX & (UIO_MX-1)) {
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log(LOG_ERR, "procfs: invalid directory entry size");
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return (EINVAL);
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}
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if (mp->mnt_flag & MNT_GETARGS) {
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pmnt = VFSTOPROC(mp);
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if (pmnt == NULL)
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return EIO;
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args.version = PROCFS_ARGSVERSION;
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args.flags = pmnt->pmnt_flags;
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return copyout(&args, data, sizeof(args));
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}
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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if (data != NULL) {
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error = copyin(data, &args, sizeof args);
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if (error != 0)
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return error;
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if (args.version != PROCFS_ARGSVERSION)
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return EINVAL;
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} else
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args.flags = 0;
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mp->mnt_flag |= MNT_LOCAL;
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pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
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M_UFSMNT, M_WAITOK); /* XXX need new malloc type */
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mp->mnt_data = pmnt;
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vfs_getnewfsid(mp);
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error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE,
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mp, p);
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pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
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pmnt->pmnt_flags = args.flags;
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return error;
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}
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/*
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* unmount system call
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*/
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int
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procfs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int error;
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int flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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if ((error = vflush(mp, 0, flags)) != 0)
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return (error);
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exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook);
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free(mp->mnt_data, M_UFSMNT);
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mp->mnt_data = 0;
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return (0);
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}
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int
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procfs_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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return (procfs_allocvp(mp, vpp, 0, PFSroot, -1));
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}
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/* ARGSUSED */
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int
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procfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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}
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/*
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* Get file system statistics.
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*/
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int
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procfs_statvfs(mp, sbp, p)
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struct mount *mp;
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struct statvfs *sbp;
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struct proc *p;
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{
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sbp->f_bsize = PAGE_SIZE;
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sbp->f_frsize = PAGE_SIZE;
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sbp->f_iosize = PAGE_SIZE;
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sbp->f_blocks = 1; /* avoid divide by zero in some df's */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_bresvd = 0;
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sbp->f_files = maxproc; /* approx */
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sbp->f_ffree = maxproc - nprocs; /* approx */
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sbp->f_favail = maxproc - nprocs; /* approx */
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sbp->f_fresvd = 0;
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sbp->f_namemax = MAXNAMLEN;
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copy_statvfs_info(sbp, mp);
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return (0);
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}
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/*ARGSUSED*/
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int
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procfs_quotactl(mp, cmds, uid, arg, p)
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struct mount *mp;
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int cmds;
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uid_t uid;
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void *arg;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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procfs_sync(mp, waitfor, uc, p)
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struct mount *mp;
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int waitfor;
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struct ucred *uc;
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struct proc *p;
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{
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return (0);
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}
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/*ARGSUSED*/
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int
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procfs_vget(mp, ino, vpp)
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struct mount *mp;
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ino_t ino;
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struct vnode **vpp;
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{
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return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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procfs_fhtovp(mp, fhp, vpp)
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struct mount *mp;
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struct fid *fhp;
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struct vnode **vpp;
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{
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return (EINVAL);
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}
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/*ARGSUSED*/
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int
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procfs_checkexp(mp, mb, what, anon)
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struct mount *mp;
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struct mbuf *mb;
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int *what;
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struct ucred **anon;
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{
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return (EINVAL);
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}
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/*ARGSUSED*/
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int
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procfs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return (EINVAL);
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}
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void
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procfs_init()
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{
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procfs_hashinit();
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}
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void
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procfs_reinit()
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{
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procfs_hashreinit();
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}
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void
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procfs_done()
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{
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procfs_hashdone();
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}
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SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "procfs",
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SYSCTL_DESCR("Process file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 12, CTL_EOL);
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/*
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* XXX the "12" above could be dynamic, thereby eliminating
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* one more instance of the "number to vfs" mapping problem,
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* but "12" is the order as taken from sys/mount.h
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*/
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}
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extern const struct vnodeopv_desc procfs_vnodeop_opv_desc;
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const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = {
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&procfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops procfs_vfsops = {
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MOUNT_PROCFS,
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procfs_mount,
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procfs_start,
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procfs_unmount,
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procfs_root,
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procfs_quotactl,
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procfs_statvfs,
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procfs_sync,
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procfs_vget,
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procfs_fhtovp,
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procfs_vptofh,
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procfs_init,
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procfs_reinit,
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procfs_done,
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NULL,
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NULL, /* vfs_mountroot */
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procfs_checkexp,
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(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
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procfs_vnodeopv_descs,
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};
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