b0ecfb42d1
The FUSE protocol allows the client (kernel) to cache a file's size, if the server (userspace daemon) allows it. A well-behaved daemon obviously should not change a file's size while a client has it cached. But a buggy daemon might. If the kernel ever detects that that has happened, then it should invalidate the entire cache for that file. Previously, we would not only cache stale data, but in the case of a file extension while we had the size cached, we accidentally extended the cache with zeros. PR: 244178 Reported by: Ben RUBSON <ben.rubson@gmx.com> Reviewed by: cem MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D24012
211 lines
6.6 KiB
C
211 lines
6.6 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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* Copyright (c) 2019 The FreeBSD Foundation
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*
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* Portions of this software were developed by BFF Storage Systems, LLC under
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* sponsorship from the FreeBSD Foundation.
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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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* $FreeBSD$
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*/
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#ifndef _FUSE_NODE_H_
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#define _FUSE_NODE_H_
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#include <sys/fnv_hash.h>
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#include <sys/types.h>
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#include <sys/mutex.h>
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#include "fuse_file.h"
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#define FN_REVOKED 0x00000020
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#define FN_FLUSHINPROG 0x00000040
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#define FN_FLUSHWANT 0x00000080
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/*
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* Indicates that the file's size is dirty; the kernel has changed it but not
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* yet send the change to the daemon. When this bit is set, the
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* cache_attrs.va_size field does not time out.
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*/
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#define FN_SIZECHANGE 0x00000100
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#define FN_DIRECTIO 0x00000200
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/* Indicates that parent_nid is valid */
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#define FN_PARENT_NID 0x00000400
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/*
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* Indicates that the file's cached timestamps are dirty. They will be flushed
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* during the next SETATTR or WRITE. Until then, the cached fields will not
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* time out.
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*/
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#define FN_MTIMECHANGE 0x00000800
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#define FN_CTIMECHANGE 0x00001000
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struct fuse_vnode_data {
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/** self **/
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uint64_t nid;
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uint64_t generation;
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/** parent **/
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uint64_t parent_nid;
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/** I/O **/
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/* List of file handles for all of the vnode's open file descriptors */
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LIST_HEAD(, fuse_filehandle) handles;
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/** flags **/
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uint32_t flag;
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/** meta **/
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/* The monotonic time after which the attr cache is invalid */
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struct bintime attr_cache_timeout;
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/*
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* Monotonic time after which the entry is invalid. Used for lookups
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* by nodeid instead of pathname.
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*/
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struct bintime entry_cache_timeout;
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struct vattr cached_attrs;
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uint64_t nlookup;
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enum vtype vtype;
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};
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/*
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* This overlays the fid structure (see mount.h). Mostly the same as the types
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* used by UFS and ext2.
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*/
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struct fuse_fid {
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uint16_t len; /* Length of structure. */
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uint16_t pad; /* Force 32-bit alignment. */
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uint32_t gen; /* Generation number. */
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uint64_t nid; /* FUSE node id. */
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};
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#define VTOFUD(vp) \
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((struct fuse_vnode_data *)((vp)->v_data))
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#define VTOI(vp) (VTOFUD(vp)->nid)
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static inline bool
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fuse_vnode_attr_cache_valid(struct vnode *vp)
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{
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struct bintime now;
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getbinuptime(&now);
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return (bintime_cmp(&(VTOFUD(vp)->attr_cache_timeout), &now, >));
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}
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static inline struct vattr*
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VTOVA(struct vnode *vp)
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{
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if (fuse_vnode_attr_cache_valid(vp))
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return &(VTOFUD(vp)->cached_attrs);
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else
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return NULL;
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}
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static inline void
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fuse_vnode_clear_attr_cache(struct vnode *vp)
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{
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bintime_clear(&VTOFUD(vp)->attr_cache_timeout);
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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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#define VTOILLU(vp) ((uint64_t)(VTOFUD(vp) ? VTOI(vp) : 0))
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#define FUSE_NULL_ID 0
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extern struct vop_vector fuse_fifoops;
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extern struct vop_vector fuse_vnops;
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int fuse_vnode_cmp(struct vnode *vp, void *nidp);
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static inline void
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fuse_vnode_setparent(struct vnode *vp, struct vnode *dvp)
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{
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if (dvp != NULL && vp->v_type == VDIR) {
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MPASS(dvp->v_type == VDIR);
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VTOFUD(vp)->parent_nid = VTOI(dvp);
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VTOFUD(vp)->flag |= FN_PARENT_NID;
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} else {
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VTOFUD(vp)->flag &= ~FN_PARENT_NID;
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}
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}
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int fuse_vnode_size(struct vnode *vp, off_t *filesize, struct ucred *cred,
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struct thread *td);
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void fuse_vnode_destroy(struct vnode *vp);
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int fuse_vnode_get(struct mount *mp, struct fuse_entry_out *feo,
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uint64_t nodeid, struct vnode *dvp, struct vnode **vpp,
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struct componentname *cnp, enum vtype vtyp);
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void fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags,
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struct thread *td);
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int fuse_vnode_savesize(struct vnode *vp, struct ucred *cred, pid_t pid);
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int fuse_vnode_setsize(struct vnode *vp, off_t newsize);
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void fuse_vnode_undirty_cached_timestamps(struct vnode *vp);
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void fuse_vnode_update(struct vnode *vp, int flags);
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void fuse_node_init(void);
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void fuse_node_destroy(void);
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#endif /* _FUSE_NODE_H_ */
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