d9b2d9f7a2
these filesystems will support shared locks until they are explicitly modified to do so. Careful review must be done to ensure that this is safe for each individual filesystem. Sponsored by: Isilon Systems, Inc.
422 lines
9.8 KiB
C
422 lines
9.8 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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* the UCLA Ficus project.
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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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* 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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* @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
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*
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* $FreeBSD$
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*/
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/*
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* Umap Layer
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* (See mount_umapfs(8) for a description of this layer.)
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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/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <fs/umapfs/umap.h>
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static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
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static vfs_omount_t umapfs_omount;
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static vfs_root_t umapfs_root;
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static vfs_quotactl_t umapfs_quotactl;
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static vfs_statfs_t umapfs_statfs;
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static vfs_unmount_t umapfs_unmount;
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static vfs_fhtovp_t umapfs_fhtovp;
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static vfs_vptofh_t umapfs_vptofh;
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static vfs_checkexp_t umapfs_checkexp;
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static vfs_vget_t umapfs_vget;
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static vfs_extattrctl_t umapfs_extattrctl;
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/*
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* Mount umap layer
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*/
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static int
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umapfs_omount(mp, path, data, ndp, td)
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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 thread *td;
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{
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struct umap_args args;
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struct vnode *lowerrootvp, *vp;
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struct vnode *umapm_rootvp;
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struct umap_mount *amp;
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size_t size;
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int error;
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#ifdef DEBUG
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int i;
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#endif
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/*
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* Only for root
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*/
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if ((error = suser(td)) != 0)
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return (error);
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#ifdef DEBUG
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printf("umapfs_mount(mp = %p)\n", (void *)mp);
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#endif
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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 | MNT_ROOTFS)) {
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return (EOPNOTSUPP);
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/* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, td));*/
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}
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/*
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* Get argument
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*/
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error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
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if (error)
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return (error);
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/*
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* Find lower node
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*/
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NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
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UIO_USERSPACE, args.target, td);
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error = namei(ndp);
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if (error)
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return (error);
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NDFREE(ndp, NDF_ONLY_PNBUF);
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/*
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* Sanity check on lower vnode
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*/
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lowerrootvp = ndp->ni_vp;
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#ifdef DEBUG
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printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
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#endif
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vrele(ndp->ni_dvp);
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ndp->ni_dvp = 0;
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if (lowerrootvp->v_type != VDIR) {
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vput(lowerrootvp);
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return (EINVAL);
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}
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#ifdef DEBUG
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printf("mp = %p\n", (void *)mp);
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#endif
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amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
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M_UMAPFSMNT, M_WAITOK); /* XXX */
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/*
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* Save reference to underlying FS
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*/
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amp->umapm_vfs = lowerrootvp->v_mount;
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/*
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* Now copy in the number of entries and maps for umap mapping.
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*/
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if (args.nentries > MAPFILEENTRIES || args.gnentries >
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GMAPFILEENTRIES) {
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vput(lowerrootvp);
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free(amp, M_UMAPFSMNT);
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/* XXX missing error = EINVAL ? */
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return (error);
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}
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amp->info_nentries = args.nentries;
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amp->info_gnentries = args.gnentries;
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error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
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2*sizeof(u_long)*args.nentries);
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if (error) {
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free(amp, M_UMAPFSMNT);
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return (error);
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}
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#ifdef DEBUG
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printf("umap_mount:nentries %d\n",args.nentries);
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for (i = 0; i < args.nentries; i++)
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printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
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amp->info_mapdata[i][1]);
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#endif
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error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
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2*sizeof(u_long)*args.gnentries);
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if (error) {
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free(amp, M_UMAPFSMNT);
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return (error);
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}
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#ifdef DEBUG
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printf("umap_mount:gnentries %d\n",args.gnentries);
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for (i = 0; i < args.gnentries; i++)
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printf(" group %lu maps to %lu\n",
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amp->info_gmapdata[i][0],
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amp->info_gmapdata[i][1]);
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#endif
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/*
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* Save reference. Each mount also holds
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* a reference on the root vnode.
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*/
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error = umap_node_create(mp, lowerrootvp, &vp);
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/*
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* Unlock the node (either the lower or the alias)
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*/
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VOP_UNLOCK(vp, 0, td);
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/*
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* Make sure the node alias worked
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*/
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if (error) {
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vrele(lowerrootvp);
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free(amp, M_UMAPFSMNT); /* XXX */
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return (error);
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}
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/*
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* Keep a held reference to the root vnode.
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* It is vrele'd in umapfs_unmount.
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*/
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ASSERT_VOP_LOCKED(vp, "umapfs_mount");
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umapm_rootvp = vp;
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umapm_rootvp->v_vflag |= VV_ROOT;
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amp->umapm_rootvp = umapm_rootvp;
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if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) amp;
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vfs_getnewfsid(mp);
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(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void)umapfs_statfs(mp, &mp->mnt_stat, td);
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#ifdef DEBUG
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printf("umapfs_mount: lower %s, alias at %s\n",
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mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
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#endif
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return (0);
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}
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/*
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* Free reference to umap layer
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*/
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static int
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umapfs_unmount(mp, mntflags, td)
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struct mount *mp;
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int mntflags;
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struct thread *td;
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{
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int error;
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int flags = 0;
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#ifdef DEBUG
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printf("umapfs_unmount(mp = %p)\n", (void *)mp);
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#endif
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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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#ifdef notyet
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
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return (EBUSY);
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#endif
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/* There is 1 extra root vnode reference (umapm_rootvp). */
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error = vflush(mp, 1, flags, td);
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if (error)
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return (error);
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/*
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* Finally, throw away the umap_mount structure
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*/
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free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
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mp->mnt_data = 0;
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return (0);
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}
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static int
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umapfs_root(mp, flags, vpp, td)
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struct mount *mp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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{
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struct thread *td = curthread; /* XXX */
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struct vnode *vp;
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#ifdef DEBUG
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printf("umapfs_root(mp = %p, vp = %p->%p)\n",
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(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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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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umapfs_quotactl(mp, cmd, uid, arg, td)
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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 thread *td;
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{
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return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, td));
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}
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static int
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umapfs_statfs(mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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int error;
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struct statfs mstat;
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#ifdef DEBUG
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printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
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(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
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bzero(&mstat, sizeof(mstat));
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error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, td);
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if (error)
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return (error);
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/* now copy across the "interesting" information and fake the rest */
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sbp->f_type = mstat.f_type;
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sbp->f_flags = mstat.f_flags;
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sbp->f_bsize = mstat.f_bsize;
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sbp->f_iosize = mstat.f_iosize;
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sbp->f_blocks = mstat.f_blocks;
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sbp->f_bfree = mstat.f_bfree;
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sbp->f_bavail = mstat.f_bavail;
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sbp->f_files = mstat.f_files;
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sbp->f_ffree = mstat.f_ffree;
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return (0);
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}
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static int
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umapfs_vget(mp, ino, flags, vpp)
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struct mount *mp;
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ino_t ino;
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int flags;
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struct vnode **vpp;
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{
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return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, flags, vpp));
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}
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static int
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umapfs_fhtovp(mp, fidp, vpp)
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struct mount *mp;
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struct fid *fidp;
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struct vnode **vpp;
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{
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return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
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}
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static int
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umapfs_checkexp(mp, nam, exflagsp, credanonp)
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struct mount *mp;
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struct sockaddr *nam;
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int *exflagsp;
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struct ucred **credanonp;
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{
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return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
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exflagsp, credanonp));
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}
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static int
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umapfs_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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struct vnode *lvp;
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lvp = UMAPVPTOLOWERVP(vp);
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return (VFS_VPTOFH(lvp, fhp));
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}
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static int
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umapfs_extattrctl(mp, cmd, filename_vp, namespace, attrname, td)
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struct mount *mp;
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int cmd;
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struct vnode *filename_vp;
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int namespace;
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const char *attrname;
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struct thread *td;
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{
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return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd,
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filename_vp, namespace, attrname, td));
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}
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static struct vfsops umap_vfsops = {
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.vfs_checkexp = umapfs_checkexp,
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.vfs_extattrctl = umapfs_extattrctl,
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.vfs_fhtovp = umapfs_fhtovp,
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.vfs_init = umapfs_init,
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.vfs_omount = umapfs_omount,
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.vfs_quotactl = umapfs_quotactl,
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.vfs_root = umapfs_root,
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.vfs_statfs = umapfs_statfs,
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.vfs_unmount = umapfs_unmount,
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.vfs_vget = umapfs_vget,
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.vfs_vptofh = umapfs_vptofh,
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};
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VFS_SET(umap_vfsops, umapfs, VFCF_LOOPBACK);
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