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>
277 lines
7.6 KiB
C
277 lines
7.6 KiB
C
/*
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* Copyright (c) 1992, 1993, 1995
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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 donated 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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* @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
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*
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* $Id: fdesc_vfsops.c,v 1.13 1997/10/12 20:24:39 phk Exp $
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*/
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/*
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* /dev/fd Filesystem
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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/resourcevar.h>
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <miscfs/fdesc/fdesc.h>
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static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
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static int fdesc_fhtovp __P((struct mount *mp, struct fid *fhp,
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struct mbuf *nam, struct vnode **vpp,
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int *exflagsp, struct ucred **credanonp));
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static int fdesc_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 fdesc_quotactl __P((struct mount *mp, int cmd, uid_t uid,
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caddr_t arg, struct proc *p));
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static int fdesc_start __P((struct mount *mp, int flags, struct proc *p));
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static int fdesc_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int fdesc_sync __P((struct mount *mp, int waitfor,
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struct ucred *cred, struct proc *p));
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static int fdesc_vget __P((struct mount *mp, ino_t ino,
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struct vnode **vpp));
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static int fdesc_vrele __P((struct mount *mp, struct vnode *vp));
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static int fdesc_vptofh __P((struct vnode *vp, struct fid *fhp));
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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static int
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fdesc_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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int error = 0;
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u_int size;
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struct fdescmount *fmp;
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struct vnode *rvp;
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
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if (error)
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return (error);
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MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
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M_FDESCMNT, M_WAITOK); /* XXX */
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rvp->v_type = VDIR;
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rvp->v_flag |= VROOT;
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fmp->f_root = rvp;
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/* XXX -- don't mark as local to work around fts() problems */
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/*mp->mnt_flag |= MNT_LOCAL;*/
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mp->mnt_data = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
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(void)fdesc_statfs(mp, &mp->mnt_stat, p);
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return (0);
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}
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static int
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fdesc_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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static int
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fdesc_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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struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*/
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if (rootvp->v_usecount > 1)
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return (EBUSY);
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if (error = vflush(mp, rootvp, flags))
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return (error);
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/*
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* Release reference on underlying root vnode
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*/
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vrele(rootvp);
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/*
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* And blow it away for future re-use
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*/
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vgone(rootvp);
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/*
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* Finally, throw away the fdescmount structure
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*/
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free(mp->mnt_data, M_FDESCMNT); /* XXX */
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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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fdesc_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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struct proc *p = curproc; /* XXX */
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struct vnode *vp;
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOFDESC(mp)->f_root;
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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*vpp = vp;
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return (0);
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}
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static int
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fdesc_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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struct filedesc *fdp;
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int lim;
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int i;
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int last;
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int freefd;
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/*
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* Compute number of free file descriptors.
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* [ Strange results will ensue if the open file
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* limit is ever reduced below the current number
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* of open files... ]
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*/
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lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
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fdp = p->p_fd;
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last = min(fdp->fd_nfiles, lim);
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freefd = 0;
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for (i = fdp->fd_freefile; i < last; i++)
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if (fdp->fd_ofiles[i] == NULL)
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freefd++;
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/*
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* Adjust for the fact that the fdesc array may not
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* have been fully allocated yet.
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*/
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if (fdp->fd_nfiles < lim)
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freefd += (lim - fdp->fd_nfiles);
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sbp->f_flags = 0;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = lim + 1; /* Allow for "." */
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sbp->f_ffree = freefd; /* See comments above */
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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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fdesc_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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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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#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
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struct sockaddr *, struct vnode **, int *, struct ucred **)))eopnotsupp)
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#define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
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struct proc *)))eopnotsupp)
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#define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
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size_t, struct proc *)))eopnotsupp)
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#define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
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eopnotsupp)
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#define fdesc_vrele ((int (*) __P((struct mount *, struct vnode *))) \
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eopnotsupp)
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#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
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static struct vfsops fdesc_vfsops = {
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fdesc_mount,
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fdesc_start,
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fdesc_unmount,
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fdesc_root,
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fdesc_quotactl,
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fdesc_statfs,
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fdesc_sync,
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fdesc_vget,
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fdesc_vrele,
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fdesc_fhtovp,
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fdesc_vptofh,
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fdesc_init,
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};
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VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
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