34bdbbd0de
a complement to all ops that return a vpp, VFS_VRELE. This is initially only for file systems that implement the following ops that do a WILLRELE: vop_create, vop_whiteout, vop_mknod, vop_remove, vop_link, vop_rename, vop_mkdir, vop_rmdir, vop_symlink This is initial DNA that doesn't do anything yet. VFS_VRELE is implemented but not called. A default vfs_vrele was created for fs implementations that use the standard vnode management routines. VFS_VRELE implementations were made for the following file systems: Standard (vfs_vrele) ffs mfs nfs msdosfs devfs ext2fs Custom union umapfs Just EOPNOTSUPP fdesc procfs kernfs portal cd9660 These implementations may change as VOP changes are implemented. In the next phase, in the vop implementations calls to vrele and the vrele part of vput will be moved to the top layer vfs_vnops and made visible to all layers. vput will be replaced by unlock in these cases. Unlocking will still be done in the per fs layer but the refcount decrement will be triggered at the top because it doesn't hurt to hold a vnode reference a little longer. This will have minimal impact on the structure of the existing code. This will only be done for vnode arguments that are released by the various fs vop implementations. Wider use of VFS_VRELE will likely require restructuring of the code. Reviewed by: phk, dyson, terry et. al. Submitted by: Michael Hancock <michaelh@cet.co.jp>
216 lines
5.9 KiB
C
216 lines
5.9 KiB
C
/*
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* Copyright (c) 1993 Jan-Simon Pendry
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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. 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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* $Id: procfs_vfsops.c,v 1.19 1997/12/30 08:46:44 bde Exp $
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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/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <miscfs/procfs/procfs.h>
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static int procfs_init __P((struct vfsconf *vfsp));
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static int procfs_mount __P((struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p));
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static int procfs_start __P((struct mount *mp, int flags, struct proc *p));
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static int procfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int procfs_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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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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static int
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procfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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u_int size;
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if (UIO_MX & (UIO_MX-1)) {
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log(LOG_ERR, "procfs: invalid directory entry size\n");
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return (EINVAL);
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}
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = 0;
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vfs_getnewfsid(mp);
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(void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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size = sizeof("procfs") - 1;
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bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void)procfs_statfs(mp, &mp->mnt_stat, p);
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return (0);
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}
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/*
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* unmount system call
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*/
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static 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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error = vflush(mp, 0, flags);
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if (error)
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return (error);
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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, Proot));
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}
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/* ARGSUSED */
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static 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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static int
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procfs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *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_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_files = maxproc; /* approx */
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sbp->f_ffree = maxproc - nprocs; /* approx */
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if (sbp != &mp->mnt_stat) {
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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static int
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procfs_init(vfsp)
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struct vfsconf *vfsp;
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{
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int error;
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/*
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* XXX - this should be rm_at_exit'd in an LKM unload function,
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*/
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if (error = at_exit(procfs_exit))
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printf("procfs: cannot register procfs_exit with at_exit -- error %d\n", error);
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return (0);
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}
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#define procfs_fhtovp ((int (*) __P((struct mount *, struct fid *, \
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struct sockaddr *, struct vnode **, int *, struct ucred **)))einval)
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#define procfs_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
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struct proc *)))eopnotsupp)
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#define procfs_sync ((int (*) __P((struct mount *, int, struct ucred *, \
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struct proc *)))nullop)
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#define procfs_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
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size_t, struct proc *)))eopnotsupp)
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#define procfs_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
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eopnotsupp)
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#define procfs_vrele ((int (*) __P((struct mount *, struct vnode *))) \
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eopnotsupp)
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#define procfs_vptofh ((int (*) __P((struct vnode *, struct fid *)))einval)
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static struct vfsops procfs_vfsops = {
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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_statfs,
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procfs_sync,
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procfs_vget,
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procfs_vrele,
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procfs_fhtovp,
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procfs_vptofh,
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procfs_init,
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};
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VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, VFCF_SYNTHETIC);
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