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 fuse_node_count = 0;
99 SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD,
100 &fuse_node_count, 0, "Count of FUSE vnodes");
102 int fuse_data_cache_enable = 1;
104 SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW,
105 &fuse_data_cache_enable, 0,
106 "enable caching of FUSE file data (including dirty data)");
108 int fuse_data_cache_invalidate = 0;
110 SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
111 &fuse_data_cache_invalidate, 0,
112 "If non-zero, discard cached clean file data when there are no active file"
115 int fuse_mmap_enable = 1;
117 SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW,
118 &fuse_mmap_enable, 0,
119 "If non-zero, and data_cache_enable is also non-zero, enable mmap(2) of "
122 int fuse_refresh_size = 0;
124 SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW,
125 &fuse_refresh_size, 0,
126 "If non-zero, and no dirty file extension data is buffered, fetch file "
127 "size before write operations");
129 int fuse_sync_resize = 1;
131 SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW,
132 &fuse_sync_resize, 0,
133 "If a cached write extended a file, inform FUSE filesystem of the changed"
134 "size immediately subsequent to the issued writes");
136 int fuse_fix_broken_io = 0;
138 SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW,
139 &fuse_fix_broken_io, 0,
140 "If non-zero, print a diagnostic warning if a userspace filesystem returns"
141 " EIO on reads of recently extended portions of files");
144 fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
145 uint64_t nodeid, enum vtype vtyp)
150 vattr_null(&fvdat->cached_attrs);
151 if (nodeid == FUSE_ROOT_ID) {
152 vp->v_vflag |= VV_ROOT;
157 for (i = 0; i < FUFH_MAXTYPE; i++)
158 fvdat->fufh[i].fh_type = FUFH_INVALID;
160 atomic_add_acq_int(&fuse_node_count, 1);
164 fuse_vnode_destroy(struct vnode *vp)
166 struct fuse_vnode_data *fvdat = vp->v_data;
169 free(fvdat, M_FUSEVN);
171 atomic_subtract_acq_int(&fuse_node_count, 1);
175 fuse_vnode_cmp(struct vnode *vp, void *nidp)
177 return (VTOI(vp) != *((uint64_t *)nidp));
180 static uint32_t __inline
181 fuse_vnode_hash(uint64_t id)
183 return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT));
187 fuse_vnode_alloc(struct mount *mp,
193 struct fuse_vnode_data *fvdat;
197 FS_DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid);
203 err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp,
204 fuse_vnode_cmp, &nodeid);
209 MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL);
210 FS_DEBUG("vnode taken from hash\n");
213 fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO);
214 err = getnewvnode("fuse", mp, &fuse_vnops, vpp);
216 free(fvdat, M_FUSEVN);
219 lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL);
220 fuse_vnode_init(*vpp, fvdat, nodeid, vtyp);
221 err = insmntque(*vpp, mp);
222 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
224 free(fvdat, M_FUSEVN);
228 err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE,
229 td, &vp2, fuse_vnode_cmp, &nodeid);
237 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
243 fuse_vnode_get(struct mount *mp,
244 struct fuse_entry_out *feo,
248 struct componentname *cnp,
251 struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread);
254 debug_printf("dvp=%p\n", dvp);
256 err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp);
261 MPASS((cnp->cn_flags & ISDOTDOT) == 0);
262 MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'));
263 fuse_vnode_setparent(*vpp, dvp);
265 if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0 &&
267 (feo->entry_valid != 0 || feo->entry_valid_nsec != 0)) {
268 ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get");
269 ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get");
270 cache_enter(dvp, *vpp, cnp);
274 * In userland, libfuse uses cached lookups for dot and dotdot entries,
275 * thus it does not really bump the nlookup counter for forget.
276 * Follow the same semantic and avoid tu bump it in order to keep
277 * nlookup counters consistent.
279 if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 &&
280 (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.')))
281 VTOFUD(*vpp)->nlookup++;
287 fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
290 * Funcation is called for every vnode open.
291 * Merge fuse_open_flags it may be 0
294 * Ideally speaking, direct io should be enabled on
295 * fd's but do not see of any way of providing that
296 * this implementation.
298 * Also cannot think of a reason why would two
299 * different fd's on same vnode would like
300 * have DIRECT_IO turned on and off. But linux
301 * based implementation works on an fd not an
302 * inode and provides such a feature.
304 * XXXIP: Handle fd based DIRECT_IO
306 if (fuse_open_flags & FOPEN_DIRECT_IO) {
307 ASSERT_VOP_ELOCKED(vp, __func__);
308 VTOFUD(vp)->flag |= FN_DIRECTIO;
309 fuse_io_invalbuf(vp, td);
311 if ((fuse_open_flags & FOPEN_KEEP_CACHE) == 0)
312 fuse_io_invalbuf(vp, td);
313 VTOFUD(vp)->flag &= ~FN_DIRECTIO;
316 if (vnode_vtype(vp) == VREG) {
317 /* XXXIP prevent getattr, by using cached node size */
318 vnode_create_vobject(vp, 0, td);
323 fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
325 struct fuse_vnode_data *fvdat = VTOFUD(vp);
326 struct thread *td = curthread;
327 struct fuse_filehandle *fufh = NULL;
328 struct fuse_dispatcher fdi;
329 struct fuse_setattr_in *fsai;
332 FS_DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp),
333 (uintmax_t)fvdat->filesize);
334 ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
336 if (fuse_isdeadfs(vp)) {
339 if (vnode_vtype(vp) == VDIR) {
342 if (vfs_isrdonly(vnode_mount(vp))) {
348 fdisp_init(&fdi, sizeof(*fsai));
349 fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
353 /* Truncate to a new value. */
354 fsai->size = fvdat->filesize;
355 fsai->valid |= FATTR_SIZE;
357 fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
359 fsai->fh = fufh->fh_id;
360 fsai->valid |= FATTR_FH;
362 err = fdisp_wait_answ(&fdi);
365 fvdat->flag &= ~FN_SIZECHANGE;
371 fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred)
374 struct fuse_vnode_data *fvdat = VTOFUD(vp);
377 if ((fvdat->flag & FN_SIZECHANGE) != 0 ||
378 (fuse_refresh_size == 0 && fvdat->filesize != 0))
381 VOP_GETATTR(vp, &va, cred);
382 FS_DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize);
386 fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
388 struct fuse_vnode_data *fvdat = VTOFUD(vp);
392 FS_DEBUG("inode=%ju oldsize=%ju newsize=%ju\n",
393 (uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize,
395 ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
397 oldsize = fvdat->filesize;
398 fvdat->filesize = newsize;
399 fvdat->flag |= FN_SIZECHANGE;
401 if (newsize < oldsize) {
402 err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
404 vnode_pager_setsize(vp, newsize);