09176f096b
The FUSE protocol demands that kernel implementations cache user filesystem path components (lookup/cnp data) for a maximum period of time in the range of [0, ULONG_MAX] seconds. In practice, typical requests are for 0, 1, or 10 seconds; or "a long time" to represent indefinite caching. Historically, FreeBSD FUSE has ignored this client directive entirely. This works fine for local-only filesystems, but causes consistency issues with multi-writer network filesystems. For now, respect 0 second cache TTLs and do not cache such metadata. Non-zero metadata caching TTLs in the range [0.000000001, ULONG_MAX] seconds are still cached indefinitely, because it is unclear how a userspace filesystem could do anything sensible with those semantics even if implemented. Pass fuse_entry_out to fuse_vnode_get when available and only cache lookup if the user filesystem did not set a zero second TTL. PR: 230258 (inspired by; does not fix)
534 lines
14 KiB
C
534 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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/capsicum.h>
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#include <sys/conf.h>
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#include <sys/filedesc.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 "fuse.h"
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#include "fuse_param.h"
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#include "fuse_node.h"
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#include "fuse_ipc.h"
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#include "fuse_internal.h"
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#include <sys/priv.h>
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#include <security/mac/mac_framework.h>
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#define FUSE_DEBUG_MODULE VFSOPS
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#include "fuse_debug.h"
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/* This will do for privilege types for now */
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#ifndef PRIV_VFS_FUSE_ALLOWOTHER
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#define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER
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#endif
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#ifndef PRIV_VFS_FUSE_MOUNT_NONUSER
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#define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER
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#endif
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#ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT
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#define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER
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#endif
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static vfs_mount_t fuse_vfsop_mount;
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static vfs_unmount_t fuse_vfsop_unmount;
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static vfs_root_t fuse_vfsop_root;
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static vfs_statfs_t fuse_vfsop_statfs;
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struct vfsops fuse_vfsops = {
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.vfs_mount = fuse_vfsop_mount,
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.vfs_unmount = fuse_vfsop_unmount,
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.vfs_root = fuse_vfsop_root,
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.vfs_statfs = fuse_vfsop_statfs,
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};
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SYSCTL_INT(_vfs_fuse, OID_AUTO, init_backgrounded, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, 1, "indicate async handshake");
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static int fuse_enforce_dev_perms = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, enforce_dev_perms, CTLFLAG_RW,
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&fuse_enforce_dev_perms, 0,
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"enforce fuse device permissions for secondary mounts");
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static unsigned sync_unmount = 1;
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SYSCTL_UINT(_vfs_fuse, OID_AUTO, sync_unmount, CTLFLAG_RW,
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&sync_unmount, 0, "specify when to use synchronous unmount");
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MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer");
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static int
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fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp)
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{
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struct nameidata nd, *ndp = &nd;
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struct vnode *devvp;
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struct cdev *fdev;
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int err;
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/*
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* Not an update, or updating the name: look up the name
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* and verify that it refers to a sensible disk device.
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*/
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NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, td);
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if ((err = namei(ndp)) != 0)
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return err;
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NDFREE(ndp, NDF_ONLY_PNBUF);
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devvp = ndp->ni_vp;
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if (devvp->v_type != VCHR) {
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vrele(devvp);
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return ENXIO;
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}
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fdev = devvp->v_rdev;
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dev_ref(fdev);
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if (fuse_enforce_dev_perms) {
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/*
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* Check if mounter can open the fuse device.
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*
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* This has significance only if we are doing a secondary mount
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* which doesn't involve actually opening fuse devices, but we
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* still want to enforce the permissions of the device (in
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* order to keep control over the circle of fuse users).
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*
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* (In case of primary mounts, we are either the superuser so
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* we can do anything anyway, or we can mount only if the
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* device is already opened by us, ie. we are permitted to open
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* the device.)
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*/
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#if 0
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#ifdef MAC
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err = mac_check_vnode_open(td->td_ucred, devvp, VREAD | VWRITE);
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if (!err)
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#endif
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#endif /* 0 */
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err = VOP_ACCESS(devvp, VREAD | VWRITE, td->td_ucred, td);
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if (err) {
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vrele(devvp);
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dev_rel(fdev);
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return err;
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}
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}
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/*
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* according to coda code, no extra lock is needed --
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* although in sys/vnode.h this field is marked "v"
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*/
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vrele(devvp);
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if (!fdev->si_devsw ||
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strcmp("fuse", fdev->si_devsw->d_name)) {
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dev_rel(fdev);
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return ENXIO;
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}
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*fdevp = fdev;
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return 0;
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}
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#define FUSE_FLAGOPT(fnam, fval) do { \
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vfs_flagopt(opts, #fnam, &mntopts, fval); \
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vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \
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} while (0)
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static int
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fuse_vfsop_mount(struct mount *mp)
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{
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int err;
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uint64_t mntopts, __mntopts;
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uint32_t max_read;
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int daemon_timeout;
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int fd;
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size_t len;
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struct cdev *fdev;
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struct fuse_data *data;
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struct thread *td;
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struct file *fp, *fptmp;
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char *fspec, *subtype;
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struct vfsoptlist *opts;
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subtype = NULL;
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max_read = ~0;
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err = 0;
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mntopts = 0;
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__mntopts = 0;
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td = curthread;
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fuse_trace_printf_vfsop();
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if (mp->mnt_flag & MNT_UPDATE)
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return EOPNOTSUPP;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_SYNCHRONOUS;
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mp->mnt_data = NULL;
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MNT_IUNLOCK(mp);
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/* Get the new options passed to mount */
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opts = mp->mnt_optnew;
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if (!opts)
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return EINVAL;
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/* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */
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if (!vfs_getopts(opts, "fspath", &err))
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return err;
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/* `from' contains the device name (eg. /dev/fuse0); REQUIRED */
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fspec = vfs_getopts(opts, "from", &err);
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if (!fspec)
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return err;
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/* `fd' contains the filedescriptor for this session; REQUIRED */
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if (vfs_scanopt(opts, "fd", "%d", &fd) != 1)
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return EINVAL;
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err = fuse_getdevice(fspec, td, &fdev);
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if (err != 0)
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return err;
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/*
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* With the help of underscored options the mount program
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* can inform us from the flags it sets by default
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*/
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FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY);
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FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN);
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FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS);
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FUSE_FLAGOPT(no_attrcache, FSESS_NO_ATTRCACHE);
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FUSE_FLAGOPT(no_readahed, FSESS_NO_READAHEAD);
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FUSE_FLAGOPT(no_datacache, FSESS_NO_DATACACHE);
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FUSE_FLAGOPT(no_namecache, FSESS_NO_NAMECACHE);
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FUSE_FLAGOPT(no_mmap, FSESS_NO_MMAP);
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FUSE_FLAGOPT(brokenio, FSESS_BROKENIO);
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(void)vfs_scanopt(opts, "max_read=", "%u", &max_read);
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if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) {
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if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)
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daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT;
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else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT)
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daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT;
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} else {
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daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
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}
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subtype = vfs_getopts(opts, "subtype=", &err);
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FS_DEBUG2G("mntopts 0x%jx\n", (uintmax_t)mntopts);
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err = fget(td, fd, &cap_read_rights, &fp);
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if (err != 0) {
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FS_DEBUG("invalid or not opened device: data=%p\n", data);
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goto out;
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}
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fptmp = td->td_fpop;
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td->td_fpop = fp;
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err = devfs_get_cdevpriv((void **)&data);
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td->td_fpop = fptmp;
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fdrop(fp, td);
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FUSE_LOCK();
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if (err != 0 || data == NULL || data->mp != NULL) {
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FS_DEBUG("invalid or not opened device: data=%p data.mp=%p\n",
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data, data != NULL ? data->mp : NULL);
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err = ENXIO;
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FUSE_UNLOCK();
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goto out;
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}
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if (fdata_get_dead(data)) {
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FS_DEBUG("device is dead during mount: data=%p\n", data);
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err = ENOTCONN;
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FUSE_UNLOCK();
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goto out;
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}
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/* Sanity + permission checks */
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if (!data->daemoncred)
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panic("fuse daemon found, but identity unknown");
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if (mntopts & FSESS_DAEMON_CAN_SPY)
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err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
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if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid)
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/* are we allowed to do the first mount? */
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err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
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if (err) {
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FUSE_UNLOCK();
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goto out;
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}
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data->ref++;
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data->mp = mp;
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data->dataflags |= mntopts;
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data->max_read = max_read;
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data->daemon_timeout = daemon_timeout;
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FUSE_UNLOCK();
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vfs_getnewfsid(mp);
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MNT_ILOCK(mp);
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mp->mnt_data = data;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_USES_BCACHE;
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MNT_IUNLOCK(mp);
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/* We need this here as this slot is used by getnewvnode() */
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mp->mnt_stat.f_iosize = DFLTPHYS;
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if (subtype) {
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strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
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strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);
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}
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copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &len);
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bzero(mp->mnt_stat.f_mntfromname + len, MNAMELEN - len);
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FS_DEBUG2G("mp %p: %s\n", mp, mp->mnt_stat.f_mntfromname);
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/* Now handshaking with daemon */
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fuse_internal_send_init(data, td);
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out:
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if (err) {
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FUSE_LOCK();
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if (data->mp == mp) {
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/*
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* Destroy device only if we acquired reference to
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* it
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*/
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FS_DEBUG("mount failed, destroy device: data=%p mp=%p"
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" err=%d\n",
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data, mp, err);
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data->mp = NULL;
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fdata_trydestroy(data);
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}
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FUSE_UNLOCK();
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dev_rel(fdev);
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}
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return err;
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}
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static int
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fuse_vfsop_unmount(struct mount *mp, int mntflags)
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{
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int err = 0;
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int flags = 0;
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struct cdev *fdev;
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struct fuse_data *data;
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struct fuse_dispatcher fdi;
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struct thread *td = curthread;
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fuse_trace_printf_vfsop();
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if (mntflags & MNT_FORCE) {
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flags |= FORCECLOSE;
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}
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data = fuse_get_mpdata(mp);
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if (!data) {
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panic("no private data for mount point?");
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}
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/* There is 1 extra root vnode reference (mp->mnt_data). */
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FUSE_LOCK();
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if (data->vroot != NULL) {
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struct vnode *vroot = data->vroot;
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data->vroot = NULL;
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FUSE_UNLOCK();
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vrele(vroot);
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} else
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FUSE_UNLOCK();
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err = vflush(mp, 0, flags, td);
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if (err) {
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debug_printf("vflush failed");
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return err;
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}
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if (fdata_get_dead(data)) {
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goto alreadydead;
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}
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fdisp_init(&fdi, 0);
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fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);
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err = fdisp_wait_answ(&fdi);
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fdisp_destroy(&fdi);
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fdata_set_dead(data);
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alreadydead:
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FUSE_LOCK();
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data->mp = NULL;
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fdev = data->fdev;
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fdata_trydestroy(data);
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FUSE_UNLOCK();
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MNT_ILOCK(mp);
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mp->mnt_data = NULL;
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mp->mnt_flag &= ~MNT_LOCAL;
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MNT_IUNLOCK(mp);
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dev_rel(fdev);
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return 0;
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}
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static int
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fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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int err = 0;
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if (data->vroot != NULL) {
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err = vget(data->vroot, lkflags, curthread);
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if (err == 0)
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*vpp = data->vroot;
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} else {
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err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL,
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VDIR);
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if (err == 0) {
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FUSE_LOCK();
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MPASS(data->vroot == NULL || data->vroot == *vpp);
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if (data->vroot == NULL) {
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FS_DEBUG("new root vnode\n");
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data->vroot = *vpp;
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FUSE_UNLOCK();
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vref(*vpp);
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} else if (data->vroot != *vpp) {
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FS_DEBUG("root vnode race\n");
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FUSE_UNLOCK();
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VOP_UNLOCK(*vpp, 0);
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vrele(*vpp);
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vrecycle(*vpp);
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*vpp = data->vroot;
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} else
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FUSE_UNLOCK();
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}
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}
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return err;
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}
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static int
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fuse_vfsop_statfs(struct mount *mp, struct statfs *sbp)
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{
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struct fuse_dispatcher fdi;
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int err = 0;
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|
|
struct fuse_statfs_out *fsfo;
|
|
struct fuse_data *data;
|
|
|
|
FS_DEBUG2G("mp %p: %s\n", mp, mp->mnt_stat.f_mntfromname);
|
|
data = fuse_get_mpdata(mp);
|
|
|
|
if (!(data->dataflags & FSESS_INITED))
|
|
goto fake;
|
|
|
|
fdisp_init(&fdi, 0);
|
|
fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, NULL, NULL);
|
|
err = fdisp_wait_answ(&fdi);
|
|
if (err) {
|
|
fdisp_destroy(&fdi);
|
|
if (err == ENOTCONN) {
|
|
/*
|
|
* We want to seem a legitimate fs even if the daemon
|
|
* is stiff dead... (so that, eg., we can still do path
|
|
* based unmounting after the daemon dies).
|
|
*/
|
|
goto fake;
|
|
}
|
|
return err;
|
|
}
|
|
fsfo = fdi.answ;
|
|
|
|
sbp->f_blocks = fsfo->st.blocks;
|
|
sbp->f_bfree = fsfo->st.bfree;
|
|
sbp->f_bavail = fsfo->st.bavail;
|
|
sbp->f_files = fsfo->st.files;
|
|
sbp->f_ffree = fsfo->st.ffree; /* cast from uint64_t to int64_t */
|
|
sbp->f_namemax = fsfo->st.namelen;
|
|
sbp->f_bsize = fsfo->st.frsize; /* cast from uint32_t to uint64_t */
|
|
|
|
FS_DEBUG("fuse_statfs_out -- blocks: %llu, bfree: %llu, bavail: %llu, "
|
|
"fil es: %llu, ffree: %llu, bsize: %i, namelen: %i\n",
|
|
(unsigned long long)fsfo->st.blocks,
|
|
(unsigned long long)fsfo->st.bfree,
|
|
(unsigned long long)fsfo->st.bavail,
|
|
(unsigned long long)fsfo->st.files,
|
|
(unsigned long long)fsfo->st.ffree, fsfo->st.bsize,
|
|
fsfo->st.namelen);
|
|
|
|
fdisp_destroy(&fdi);
|
|
return 0;
|
|
|
|
fake:
|
|
sbp->f_blocks = 0;
|
|
sbp->f_bfree = 0;
|
|
sbp->f_bavail = 0;
|
|
sbp->f_files = 0;
|
|
sbp->f_ffree = 0;
|
|
sbp->f_namemax = 0;
|
|
sbp->f_bsize = FUSE_DEFAULT_BLOCKSIZE;
|
|
|
|
return 0;
|
|
}
|