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>
83 #include <security/mac/mac_framework.h>
85 #include <vm/vm_extern.h>
88 #include "fuse_node.h"
89 #include "fuse_internal.h"
93 SDT_PROVIDER_DECLARE(fuse);
96 * arg0: verbosity. Higher numbers give more verbose messages
97 * arg1: Textual message
99 SDT_PROBE_DEFINE2(fuse, , node, trace, "int", "char*");
101 MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data");
103 static int sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS);
105 static int fuse_node_count = 0;
107 SYSCTL_INT(_vfs_fusefs, OID_AUTO, node_count, CTLFLAG_RD,
108 &fuse_node_count, 0, "Count of FUSE vnodes");
110 int fuse_data_cache_mode = FUSE_CACHE_WT;
112 SYSCTL_PROC(_vfs_fusefs, OID_AUTO, data_cache_mode, CTLTYPE_INT|CTLFLAG_RW,
113 &fuse_data_cache_mode, 0, sysctl_fuse_cache_mode, "I",
114 "Zero: disable caching of FUSE file data; One: write-through caching "
115 "(default); Two: write-back caching (generally unsafe)");
117 int fuse_data_cache_invalidate = 0;
119 SYSCTL_INT(_vfs_fusefs, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
120 &fuse_data_cache_invalidate, 0,
121 "If non-zero, discard cached clean file data when there are no active file"
124 int fuse_mmap_enable = 1;
126 SYSCTL_INT(_vfs_fusefs, OID_AUTO, mmap_enable, CTLFLAG_RW,
127 &fuse_mmap_enable, 0,
128 "If non-zero, and data_cache_mode is also non-zero, enable mmap(2) of "
131 int fuse_refresh_size = 0;
133 SYSCTL_INT(_vfs_fusefs, OID_AUTO, refresh_size, CTLFLAG_RW,
134 &fuse_refresh_size, 0,
135 "If non-zero, and no dirty file extension data is buffered, fetch file "
136 "size before write operations");
138 int fuse_sync_resize = 1;
140 SYSCTL_INT(_vfs_fusefs, OID_AUTO, sync_resize, CTLFLAG_RW,
141 &fuse_sync_resize, 0,
142 "If a cached write extended a file, inform FUSE filesystem of the changed"
143 "size immediately subsequent to the issued writes");
145 int fuse_fix_broken_io = 0;
147 SYSCTL_INT(_vfs_fusefs, OID_AUTO, fix_broken_io, CTLFLAG_RW,
148 &fuse_fix_broken_io, 0,
149 "If non-zero, print a diagnostic warning if a userspace filesystem returns"
150 " EIO on reads of recently extended portions of files");
153 sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS)
158 error = sysctl_handle_int(oidp, &val, 0, req);
159 if (error || !req->newptr)
175 fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
176 uint64_t nodeid, enum vtype vtyp)
179 LIST_INIT(&fvdat->handles);
180 vattr_null(&fvdat->cached_attrs);
181 if (nodeid == FUSE_ROOT_ID) {
182 vp->v_vflag |= VV_ROOT;
187 atomic_add_acq_int(&fuse_node_count, 1);
191 fuse_vnode_destroy(struct vnode *vp)
193 struct fuse_vnode_data *fvdat = vp->v_data;
196 KASSERT(LIST_EMPTY(&fvdat->handles),
197 ("Destroying fuse vnode with open files!"));
198 free(fvdat, M_FUSEVN);
200 atomic_subtract_acq_int(&fuse_node_count, 1);
204 fuse_vnode_cmp(struct vnode *vp, void *nidp)
206 return (VTOI(vp) != *((uint64_t *)nidp));
209 static uint32_t inline
210 fuse_vnode_hash(uint64_t id)
212 return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT));
216 fuse_vnode_alloc(struct mount *mp,
222 struct fuse_vnode_data *fvdat;
230 err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp,
231 fuse_vnode_cmp, &nodeid);
236 MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL);
237 SDT_PROBE2(fuse, , node, trace, 1, "vnode taken from hash");
240 fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO);
241 err = getnewvnode("fuse", mp, &fuse_vnops, vpp);
243 free(fvdat, M_FUSEVN);
246 lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL);
247 fuse_vnode_init(*vpp, fvdat, nodeid, vtyp);
248 err = insmntque(*vpp, mp);
249 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
251 free(fvdat, M_FUSEVN);
255 err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE,
256 td, &vp2, fuse_vnode_cmp, &nodeid);
264 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
270 fuse_vnode_get(struct mount *mp,
271 struct fuse_entry_out *feo,
275 struct componentname *cnp,
278 struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread);
281 err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp);
286 MPASS(cnp && (cnp->cn_flags & ISDOTDOT) == 0);
288 !(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'));
289 fuse_vnode_setparent(*vpp, dvp);
291 if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0 &&
293 (feo->entry_valid != 0 || feo->entry_valid_nsec != 0)) {
294 ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get");
295 ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get");
296 cache_enter(dvp, *vpp, cnp);
300 * In userland, libfuse uses cached lookups for dot and dotdot entries,
301 * thus it does not really bump the nlookup counter for forget.
302 * Follow the same semantic and avoid tu bump it in order to keep
303 * nlookup counters consistent.
305 if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 &&
306 (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.')))
307 VTOFUD(*vpp)->nlookup++;
313 fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
316 * Function is called for every vnode open.
317 * Merge fuse_open_flags it may be 0
320 * Ideally speaking, direct io should be enabled on
321 * fd's but do not see of any way of providing that
322 * this implementation.
324 * Also cannot think of a reason why would two
325 * different fd's on same vnode would like
326 * have DIRECT_IO turned on and off. But linux
327 * based implementation works on an fd not an
328 * inode and provides such a feature.
330 * XXXIP: Handle fd based DIRECT_IO
332 if (vnode_vtype(vp) == VREG) {
333 /* XXXIP prevent getattr, by using cached node size */
334 vnode_create_vobject(vp, 0, td);
339 fuse_vnode_savesize(struct vnode *vp, struct ucred *cred, pid_t pid)
341 struct fuse_vnode_data *fvdat = VTOFUD(vp);
342 struct thread *td = curthread;
343 struct fuse_filehandle *fufh = NULL;
344 struct fuse_dispatcher fdi;
345 struct fuse_setattr_in *fsai;
348 ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
350 if (fuse_isdeadfs(vp)) {
353 if (vnode_vtype(vp) == VDIR) {
356 if (vfs_isrdonly(vnode_mount(vp))) {
362 fdisp_init(&fdi, sizeof(*fsai));
363 fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
367 /* Truncate to a new value. */
368 fsai->size = fvdat->filesize;
369 fsai->valid |= FATTR_SIZE;
371 fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
373 fsai->fh = fufh->fh_id;
374 fsai->valid |= FATTR_FH;
376 err = fdisp_wait_answ(&fdi);
379 fvdat->flag &= ~FN_SIZECHANGE;
385 fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred)
388 struct fuse_vnode_data *fvdat = VTOFUD(vp);
392 if ((fvdat->flag & FN_SIZECHANGE) != 0 ||
393 fuse_data_cache_mode == FUSE_CACHE_UC ||
394 (fuse_refresh_size == 0 && fvdat->filesize != 0))
397 err = VOP_GETATTR(vp, &va, cred);
398 SDT_PROBE2(fuse, , node, trace, 1, "refreshed file size");
403 fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
405 struct fuse_vnode_data *fvdat = VTOFUD(vp);
409 struct buf *bp = NULL;
412 ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
414 iosize = fuse_iosize(vp);
415 oldsize = fvdat->filesize;
416 fvdat->filesize = newsize;
417 if ((attrs = VTOVA(vp)) != NULL)
418 attrs->va_size = newsize;
419 fvdat->flag |= FN_SIZECHANGE;
421 if (newsize < oldsize) {
425 err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
428 if (newsize % iosize == 0)
431 * Zero the contents of the last partial block.
432 * Sure seems like vtruncbuf should do this for us.
435 lbn = newsize / iosize;
436 bp = getblk(vp, lbn, iosize, PCATCH, 0, 0);
441 if (!(bp->b_flags & B_CACHE))
442 goto out; /* Nothing to do */
443 zsize = (lbn + 1) * iosize - newsize;
444 bzero(bp->b_data + newsize - lbn * iosize, zsize);
449 vnode_pager_setsize(vp, newsize);