5fe580195f
This has been developed during 2 summer of code mandates and being revived by gnn recently. The functionality in this commit mirrors entirely content of fusefs-kmod port, which doesn't need to be installed anymore for -CURRENT setups. In order to get some sparse technical notes, please refer to: http://lists.freebsd.org/pipermail/freebsd-fs/2012-March/013876.html or to the project branch: svn://svn.freebsd.org/base/projects/fuse/ which also contains granular history of changes happened during port refinements. This commit does not came from the branch reintegration itself because it seems svn is not behaving properly for this functionaly at the moment. Partly Sponsored by: Google, Summer of Code program 2005, 2011 Originally submitted by: ilya, Csaba Henk <csaba-ml AT creo DOT hu > In collabouration with: pho Tested by: flo, gnn, Gustau Perez, Kevin Oberman <rkoberman AT gmail DOT com> MFC after: 2 months
385 lines
10 KiB
C
385 lines
10 KiB
C
/*
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* Copyright (c) 2007-2009 Google Inc. and Amit Singh
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* All rights reserved.
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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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Copyright (C) 2005 Csaba Henk.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/fcntl.h>
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#include <sys/fnv_hash.h>
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#include <sys/priv.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include "fuse.h"
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#include "fuse_node.h"
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#include "fuse_internal.h"
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#include "fuse_io.h"
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#include "fuse_ipc.h"
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#define FUSE_DEBUG_MODULE VNOPS
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#include "fuse_debug.h"
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MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data");
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static int fuse_node_count = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD,
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&fuse_node_count, 0, "");
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int fuse_data_cache_enable = 1;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW,
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&fuse_data_cache_enable, 0, "");
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int fuse_data_cache_invalidate = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
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&fuse_data_cache_invalidate, 0, "");
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int fuse_mmap_enable = 1;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW,
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&fuse_mmap_enable, 0, "");
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int fuse_refresh_size = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW,
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&fuse_refresh_size, 0, "");
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int fuse_sync_resize = 1;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW,
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&fuse_sync_resize, 0, "");
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int fuse_fix_broken_io = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW,
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&fuse_fix_broken_io, 0, "");
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static void
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fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
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uint64_t nodeid, enum vtype vtyp)
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{
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int i;
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fvdat->nid = nodeid;
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if (nodeid == FUSE_ROOT_ID) {
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vp->v_vflag |= VV_ROOT;
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}
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vp->v_type = vtyp;
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vp->v_data = fvdat;
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for (i = 0; i < FUFH_MAXTYPE; i++)
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fvdat->fufh[i].fh_type = FUFH_INVALID;
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atomic_add_acq_int(&fuse_node_count, 1);
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}
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void
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fuse_vnode_destroy(struct vnode *vp)
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{
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struct fuse_vnode_data *fvdat = vp->v_data;
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vp->v_data = NULL;
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free(fvdat, M_FUSEVN);
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atomic_subtract_acq_int(&fuse_node_count, 1);
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}
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static int
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fuse_vnode_cmp(struct vnode *vp, void *nidp)
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{
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return (VTOI(vp) != *((uint64_t *)nidp));
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}
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static uint32_t __inline
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fuse_vnode_hash(uint64_t id)
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{
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return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT));
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}
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static int
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fuse_vnode_alloc(struct mount *mp,
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struct thread *td,
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uint64_t nodeid,
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enum vtype vtyp,
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struct vnode **vpp)
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{
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struct fuse_vnode_data *fvdat;
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struct vnode *vp2;
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int err = 0;
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DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid);
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if (vtyp == VNON) {
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return EINVAL;
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}
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*vpp = NULL;
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err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp,
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fuse_vnode_cmp, &nodeid);
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if (err)
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return (err);
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if (*vpp) {
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MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL);
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DEBUG("vnode taken from hash\n");
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return (0);
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}
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fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO);
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err = getnewvnode("fuse", mp, &fuse_vnops, vpp);
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if (err) {
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free(fvdat, M_FUSEVN);
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return (err);
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}
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lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL);
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fuse_vnode_init(*vpp, fvdat, nodeid, vtyp);
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err = insmntque(*vpp, mp);
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ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
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if (err) {
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free(fvdat, M_FUSEVN);
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*vpp = NULL;
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return (err);
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}
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err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE,
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td, &vp2, fuse_vnode_cmp, &nodeid);
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if (err)
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return (err);
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if (vp2 != NULL) {
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*vpp = vp2;
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return (0);
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}
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ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
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return (0);
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}
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int
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fuse_vnode_get(struct mount *mp,
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uint64_t nodeid,
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struct vnode *dvp,
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struct vnode **vpp,
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struct componentname *cnp,
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enum vtype vtyp)
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{
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struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread);
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int err = 0;
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debug_printf("dvp=%p\n", dvp);
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err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp);
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if (err) {
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return err;
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}
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if (dvp != NULL) {
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MPASS((cnp->cn_flags & ISDOTDOT) == 0);
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MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'));
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fuse_vnode_setparent(*vpp, dvp);
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}
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if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0) {
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ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get");
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ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get");
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cache_enter(dvp, *vpp, cnp);
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}
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/*
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* In userland, libfuse uses cached lookups for dot and dotdot entries,
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* thus it does not really bump the nlookup counter for forget.
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* Follow the same semantic and avoid tu bump it in order to keep
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* nlookup counters consistent.
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*/
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if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 &&
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(cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.')))
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VTOFUD(*vpp)->nlookup++;
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return 0;
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}
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void
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fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
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{
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/*
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* Funcation is called for every vnode open.
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* Merge fuse_open_flags it may be 0
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*
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* XXXIP: Handle FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE
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*/
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if (vnode_vtype(vp) == VREG) {
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/* XXXIP prevent getattr, by using cached node size */
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vnode_create_vobject(vp, 0, td);
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}
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}
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int
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fuse_isvalid_attr(struct vnode *vp)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct timespec uptsp;
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nanouptime(&uptsp);
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return fuse_timespec_cmp(&uptsp, &fvdat->cached_attrs_valid, <=);
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}
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int
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fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct thread *td = curthread;
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struct fuse_filehandle *fufh = NULL;
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struct fuse_dispatcher fdi;
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struct fuse_setattr_in *fsai;
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int err = 0;
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DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp),
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(uintmax_t)fvdat->filesize);
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ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
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if (fuse_isdeadfs(vp)) {
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return EBADF;
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}
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if (vnode_vtype(vp) == VDIR) {
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return EISDIR;
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}
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if (vfs_isrdonly(vnode_mount(vp))) {
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return EROFS;
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}
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if (cred == NULL) {
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cred = td->td_ucred;
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}
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fdisp_init(&fdi, sizeof(*fsai));
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fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
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fsai = fdi.indata;
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fsai->valid = 0;
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/* Truncate to a new value. */
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fsai->size = fvdat->filesize;
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fsai->valid |= FATTR_SIZE;
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fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
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if (fufh) {
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fsai->fh = fufh->fh_id;
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fsai->valid |= FATTR_FH;
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}
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err = fdisp_wait_answ(&fdi);
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fdisp_destroy(&fdi);
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if (err == 0)
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fvdat->flag &= ~FN_SIZECHANGE;
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fuse_invalidate_attr(vp);
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return err;
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}
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void
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fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct vattr va;
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if ((fvdat->flag & FN_SIZECHANGE) != 0 ||
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(fuse_refresh_size == 0 && fvdat->filesize != 0) ||
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fuse_isvalid_attr(vp))
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return;
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VOP_GETATTR(vp, &va, cred);
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DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize);
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}
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int
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fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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off_t oldsize;
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int err = 0;
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DEBUG("inode=%ju oldsize=%ju newsize=%ju\n",
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(uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize,
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(uintmax_t)newsize);
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ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
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oldsize = fvdat->filesize;
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fvdat->filesize = newsize;
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fvdat->flag |= FN_SIZECHANGE;
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if (newsize < oldsize) {
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err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
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}
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vnode_pager_setsize(vp, newsize);
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fuse_invalidate_attr(vp);
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return err;
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}
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