72393e3d80
When I/O on a file under fuse is switched from buffered to DIRECT_IO, it was possible to read stale (before a recent modification) data from the buffer cache. This patch invalidates the buffer cache for the file to fix this. PR: 194293 MFC after: 2 weeks
390 lines
10 KiB
C
390 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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FS_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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FS_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_KEEP_CACHE
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*/
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/*
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* Ideally speaking, direct io should be enabled on
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* fd's but do not see of any way of providing that
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* this implementation.
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*
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* Also cannot think of a reason why would two
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* different fd's on same vnode would like
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* have DIRECT_IO turned on and off. But linux
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* based implementation works on an fd not an
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* inode and provides such a feature.
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*
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* XXXIP: Handle fd based DIRECT_IO
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*/
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if (fuse_open_flags & FOPEN_DIRECT_IO) {
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ASSERT_VOP_ELOCKED(vp, __func__);
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VTOFUD(vp)->flag |= FN_DIRECTIO;
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fuse_io_invalbuf(vp, td);
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} else {
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VTOFUD(vp)->flag &= ~FN_DIRECTIO;
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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_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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FS_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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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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return;
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VOP_GETATTR(vp, &va, cred);
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FS_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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FS_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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return err;
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}
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