adf5d360a7
adjusted via sysctl. file systems that have hash tables which are sized based on the value of this variable now resize those hash tables using the new value. the max number of FFS softdeps is also recalculated. convert various file systems to use the <sys/queue.h> macros for their hash tables.
354 lines
8.0 KiB
C
354 lines
8.0 KiB
C
/* $NetBSD: fdesc_vfsops.c,v 1.34 2001/09/15 16:12:58 chs Exp $ */
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/*
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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 8.10 (Berkeley) 5/14/95
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*
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* #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp #
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*/
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/*
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* /dev/fd Filesystem
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*/
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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/systm.h>
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#include <sys/time.h>
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#include <sys/types.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/namei.h>
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#include <sys/malloc.h>
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#include <miscfs/fdesc/fdesc.h>
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int fdesc_mount __P((struct mount *, const char *, void *,
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struct nameidata *, struct proc *));
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int fdesc_start __P((struct mount *, int, struct proc *));
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int fdesc_unmount __P((struct mount *, int, struct proc *));
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int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t,
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struct proc *));
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int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *));
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int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *));
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int fdesc_vget __P((struct mount *, ino_t, struct vnode **));
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int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **));
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int fdesc_checkexp __P((struct mount *, struct mbuf *, int *,
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struct ucred **));
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int fdesc_vptofh __P((struct vnode *, struct fid *));
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int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
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struct proc *));
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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int
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fdesc_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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int error = 0;
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size_t 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_UFSMNT, 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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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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memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size);
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memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
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memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc"));
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VOP_UNLOCK(rvp, 0);
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return (0);
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}
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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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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)) != 0)
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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_UFSMNT); /* 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 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);
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*vpp = vp;
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return (0);
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}
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int
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fdesc_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t 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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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_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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#ifdef COMPAT_09
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sbp->f_type = 6;
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#else
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sbp->f_type = 0;
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#endif
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if (sbp != &mp->mnt_stat) {
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memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid));
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memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN);
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memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN);
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}
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strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
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return (0);
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}
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/*ARGSUSED*/
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int
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fdesc_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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/*
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* Fdesc flat namespace lookup.
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* Currently unsupported.
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*/
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int
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fdesc_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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fdesc_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 (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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fdesc_checkexp(mp, nam, exflagsp, credanonp)
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struct mount *mp;
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struct mbuf *nam;
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int *exflagsp;
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struct ucred **credanonp;
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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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fdesc_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 (EOPNOTSUPP);
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}
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int
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fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
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int *name;
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u_int namelen;
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void *oldp;
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size_t *oldlenp;
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void *newp;
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size_t newlen;
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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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extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc;
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const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = {
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&fdesc_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops fdesc_vfsops = {
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MOUNT_FDESC,
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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_fhtovp,
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fdesc_vptofh,
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fdesc_init,
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NULL,
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fdesc_done,
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fdesc_sysctl,
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NULL, /* vfs_mountroot */
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fdesc_checkexp,
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fdesc_vnodeopv_descs,
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};
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