2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
45 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
61 #include <sys/types.h>
62 #include <sys/module.h>
63 #include <sys/systm.h>
64 #include <sys/errno.h>
65 #include <sys/param.h>
66 #include <sys/kernel.h>
69 #include <sys/malloc.h>
70 #include <sys/queue.h>
73 #include <sys/mutex.h>
75 #include <sys/vnode.h>
76 #include <sys/namei.h>
77 #include <sys/mount.h>
78 #include <sys/sysctl.h>
79 #include <sys/fcntl.h>
80 #include <sys/fnv_hash.h>
82 #include <security/mac/mac_framework.h>
84 #include <vm/vm_extern.h>
87 #include "fuse_node.h"
88 #include "fuse_internal.h"
92 #define FUSE_DEBUG_MODULE VNOPS
93 #include "fuse_debug.h"
95 MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data");
97 static int sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS);
99 static int fuse_node_count = 0;
101 SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD,
102 &fuse_node_count, 0, "Count of FUSE vnodes");
104 int fuse_data_cache_mode = FUSE_CACHE_WT;
106 SYSCTL_PROC(_vfs_fuse, OID_AUTO, data_cache_mode, CTLTYPE_INT|CTLFLAG_RW,
107 &fuse_data_cache_mode, 0, sysctl_fuse_cache_mode, "I",
108 "Zero: disable caching of FUSE file data; One: write-through caching "
109 "(default); Two: write-back caching (generally unsafe)");
111 int fuse_data_cache_invalidate = 0;
113 SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
114 &fuse_data_cache_invalidate, 0,
115 "If non-zero, discard cached clean file data when there are no active file"
118 int fuse_mmap_enable = 1;
120 SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW,
121 &fuse_mmap_enable, 0,
122 "If non-zero, and data_cache_mode is also non-zero, enable mmap(2) of "
125 int fuse_refresh_size = 0;
127 SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW,
128 &fuse_refresh_size, 0,
129 "If non-zero, and no dirty file extension data is buffered, fetch file "
130 "size before write operations");
132 int fuse_sync_resize = 1;
134 SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW,
135 &fuse_sync_resize, 0,
136 "If a cached write extended a file, inform FUSE filesystem of the changed"
137 "size immediately subsequent to the issued writes");
139 int fuse_fix_broken_io = 0;
141 SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW,
142 &fuse_fix_broken_io, 0,
143 "If non-zero, print a diagnostic warning if a userspace filesystem returns"
144 " EIO on reads of recently extended portions of files");
147 sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS)
152 error = sysctl_handle_int(oidp, &val, 0, req);
153 if (error || !req->newptr)
169 fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
170 uint64_t nodeid, enum vtype vtyp)
175 vattr_null(&fvdat->cached_attrs);
176 if (nodeid == FUSE_ROOT_ID) {
177 vp->v_vflag |= VV_ROOT;
182 for (i = 0; i < FUFH_MAXTYPE; i++)
183 fvdat->fufh[i].fh_type = FUFH_INVALID;
185 atomic_add_acq_int(&fuse_node_count, 1);
189 fuse_vnode_destroy(struct vnode *vp)
191 struct fuse_vnode_data *fvdat = vp->v_data;
194 free(fvdat, M_FUSEVN);
196 atomic_subtract_acq_int(&fuse_node_count, 1);
200 fuse_vnode_cmp(struct vnode *vp, void *nidp)
202 return (VTOI(vp) != *((uint64_t *)nidp));
205 static uint32_t inline
206 fuse_vnode_hash(uint64_t id)
208 return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT));
212 fuse_vnode_alloc(struct mount *mp,
218 struct fuse_vnode_data *fvdat;
222 FS_DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid);
228 err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp,
229 fuse_vnode_cmp, &nodeid);
234 MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL);
235 FS_DEBUG("vnode taken from hash\n");
238 fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO);
239 err = getnewvnode("fuse", mp, &fuse_vnops, vpp);
241 free(fvdat, M_FUSEVN);
244 lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL);
245 fuse_vnode_init(*vpp, fvdat, nodeid, vtyp);
246 err = insmntque(*vpp, mp);
247 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
249 free(fvdat, M_FUSEVN);
253 err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE,
254 td, &vp2, fuse_vnode_cmp, &nodeid);
262 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
268 fuse_vnode_get(struct mount *mp,
269 struct fuse_entry_out *feo,
273 struct componentname *cnp,
276 struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread);
279 debug_printf("dvp=%p\n", dvp);
281 err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp);
286 MPASS((cnp->cn_flags & ISDOTDOT) == 0);
287 MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'));
288 fuse_vnode_setparent(*vpp, dvp);
290 if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0 &&
292 (feo->entry_valid != 0 || feo->entry_valid_nsec != 0)) {
293 ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get");
294 ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get");
295 cache_enter(dvp, *vpp, cnp);
299 * In userland, libfuse uses cached lookups for dot and dotdot entries,
300 * thus it does not really bump the nlookup counter for forget.
301 * Follow the same semantic and avoid tu bump it in order to keep
302 * nlookup counters consistent.
304 if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 &&
305 (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.')))
306 VTOFUD(*vpp)->nlookup++;
312 fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
315 * Funcation is called for every vnode open.
316 * Merge fuse_open_flags it may be 0
319 * Ideally speaking, direct io should be enabled on
320 * fd's but do not see of any way of providing that
321 * this implementation.
323 * Also cannot think of a reason why would two
324 * different fd's on same vnode would like
325 * have DIRECT_IO turned on and off. But linux
326 * based implementation works on an fd not an
327 * inode and provides such a feature.
329 * XXXIP: Handle fd based DIRECT_IO
331 if (fuse_open_flags & FOPEN_DIRECT_IO) {
332 ASSERT_VOP_ELOCKED(vp, __func__);
333 VTOFUD(vp)->flag |= FN_DIRECTIO;
334 fuse_io_invalbuf(vp, td);
336 if ((fuse_open_flags & FOPEN_KEEP_CACHE) == 0)
337 fuse_io_invalbuf(vp, td);
338 VTOFUD(vp)->flag &= ~FN_DIRECTIO;
341 if (vnode_vtype(vp) == VREG) {
342 /* XXXIP prevent getattr, by using cached node size */
343 vnode_create_vobject(vp, 0, td);
348 fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
350 struct fuse_vnode_data *fvdat = VTOFUD(vp);
351 struct thread *td = curthread;
352 struct fuse_filehandle *fufh = NULL;
353 struct fuse_dispatcher fdi;
354 struct fuse_setattr_in *fsai;
357 FS_DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp),
358 (uintmax_t)fvdat->filesize);
359 ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
361 if (fuse_isdeadfs(vp)) {
364 if (vnode_vtype(vp) == VDIR) {
367 if (vfs_isrdonly(vnode_mount(vp))) {
373 fdisp_init(&fdi, sizeof(*fsai));
374 fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
378 /* Truncate to a new value. */
379 fsai->size = fvdat->filesize;
380 fsai->valid |= FATTR_SIZE;
382 fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
384 fsai->fh = fufh->fh_id;
385 fsai->valid |= FATTR_FH;
387 err = fdisp_wait_answ(&fdi);
390 fvdat->flag &= ~FN_SIZECHANGE;
396 fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred)
399 struct fuse_vnode_data *fvdat = VTOFUD(vp);
402 if ((fvdat->flag & FN_SIZECHANGE) != 0 ||
403 fuse_data_cache_mode == FUSE_CACHE_UC ||
404 (fuse_refresh_size == 0 && fvdat->filesize != 0))
407 VOP_GETATTR(vp, &va, cred);
408 FS_DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize);
412 fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
414 struct fuse_vnode_data *fvdat = VTOFUD(vp);
418 FS_DEBUG("inode=%ju oldsize=%ju newsize=%ju\n",
419 (uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize,
421 ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
423 oldsize = fvdat->filesize;
424 fvdat->filesize = newsize;
425 fvdat->flag |= FN_SIZECHANGE;
427 if (newsize < oldsize) {
428 err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
430 vnode_pager_setsize(vp, newsize);