1 /* 2 * Copyright (c) 2007-2009 Google Inc. and Amit Singh 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following disclaimer 13 * in the documentation and/or other materials provided with the 14 * distribution. 15 * * Neither the name of Google Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Copyright (C) 2005 Csaba Henk. 32 * All rights reserved. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 43 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 #include <sys/cdefs.h> 57 __FBSDID("$FreeBSD$"); 58 59 #include <sys/types.h> 60 #include <sys/module.h> 61 #include <sys/systm.h> 62 #include <sys/errno.h> 63 #include <sys/param.h> 64 #include <sys/kernel.h> 65 #include <sys/conf.h> 66 #include <sys/uio.h> 67 #include <sys/malloc.h> 68 #include <sys/queue.h> 69 #include <sys/lock.h> 70 #include <sys/sx.h> 71 #include <sys/mutex.h> 72 #include <sys/proc.h> 73 #include <sys/vnode.h> 74 #include <sys/namei.h> 75 #include <sys/mount.h> 76 #include <sys/sysctl.h> 77 #include <sys/fcntl.h> 78 #include <sys/fnv_hash.h> 79 #include <sys/priv.h> 80 #include <security/mac/mac_framework.h> 81 #include <vm/vm.h> 82 #include <vm/vm_extern.h> 83 84 #include "fuse.h" 85 #include "fuse_node.h" 86 #include "fuse_internal.h" 87 #include "fuse_io.h" 88 #include "fuse_ipc.h" 89 90 #define FUSE_DEBUG_MODULE VNOPS 91 #include "fuse_debug.h" 92 93 MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data"); 94 95 static int fuse_node_count = 0; 96 97 SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD, 98 &fuse_node_count, 0, ""); 99 100 int fuse_data_cache_enable = 1; 101 102 SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW, 103 &fuse_data_cache_enable, 0, ""); 104 105 int fuse_data_cache_invalidate = 0; 106 107 SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW, 108 &fuse_data_cache_invalidate, 0, ""); 109 110 int fuse_mmap_enable = 1; 111 112 SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW, 113 &fuse_mmap_enable, 0, ""); 114 115 int fuse_refresh_size = 0; 116 117 SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW, 118 &fuse_refresh_size, 0, ""); 119 120 int fuse_sync_resize = 1; 121 122 SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW, 123 &fuse_sync_resize, 0, ""); 124 125 int fuse_fix_broken_io = 0; 126 127 SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW, 128 &fuse_fix_broken_io, 0, ""); 129 130 static void 131 fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat, 132 uint64_t nodeid, enum vtype vtyp) 133 { 134 int i; 135 136 fvdat->nid = nodeid; 137 if (nodeid == FUSE_ROOT_ID) { 138 vp->v_vflag |= VV_ROOT; 139 } 140 vp->v_type = vtyp; 141 vp->v_data = fvdat; 142 143 for (i = 0; i < FUFH_MAXTYPE; i++) 144 fvdat->fufh[i].fh_type = FUFH_INVALID; 145 146 atomic_add_acq_int(&fuse_node_count, 1); 147 } 148 149 void 150 fuse_vnode_destroy(struct vnode *vp) 151 { 152 struct fuse_vnode_data *fvdat = vp->v_data; 153 154 vp->v_data = NULL; 155 free(fvdat, M_FUSEVN); 156 157 atomic_subtract_acq_int(&fuse_node_count, 1); 158 } 159 160 static int 161 fuse_vnode_cmp(struct vnode *vp, void *nidp) 162 { 163 return (VTOI(vp) != *((uint64_t *)nidp)); 164 } 165 166 static uint32_t __inline 167 fuse_vnode_hash(uint64_t id) 168 { 169 return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT)); 170 } 171 172 static int 173 fuse_vnode_alloc(struct mount *mp, 174 struct thread *td, 175 uint64_t nodeid, 176 enum vtype vtyp, 177 struct vnode **vpp) 178 { 179 struct fuse_vnode_data *fvdat; 180 struct vnode *vp2; 181 int err = 0; 182 183 FS_DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid); 184 185 if (vtyp == VNON) { 186 return EINVAL; 187 } 188 *vpp = NULL; 189 err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp, 190 fuse_vnode_cmp, &nodeid); 191 if (err) 192 return (err); 193 194 if (*vpp) { 195 MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL); 196 FS_DEBUG("vnode taken from hash\n"); 197 return (0); 198 } 199 fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO); 200 err = getnewvnode("fuse", mp, &fuse_vnops, vpp); 201 if (err) { 202 free(fvdat, M_FUSEVN); 203 return (err); 204 } 205 lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL); 206 fuse_vnode_init(*vpp, fvdat, nodeid, vtyp); 207 err = insmntque(*vpp, mp); 208 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); 209 if (err) { 210 free(fvdat, M_FUSEVN); 211 *vpp = NULL; 212 return (err); 213 } 214 err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, 215 td, &vp2, fuse_vnode_cmp, &nodeid); 216 if (err) 217 return (err); 218 if (vp2 != NULL) { 219 *vpp = vp2; 220 return (0); 221 } 222 223 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); 224 225 return (0); 226 } 227 228 int 229 fuse_vnode_get(struct mount *mp, 230 uint64_t nodeid, 231 struct vnode *dvp, 232 struct vnode **vpp, 233 struct componentname *cnp, 234 enum vtype vtyp) 235 { 236 struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread); 237 int err = 0; 238 239 debug_printf("dvp=%p\n", dvp); 240 241 err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp); 242 if (err) { 243 return err; 244 } 245 if (dvp != NULL) { 246 MPASS((cnp->cn_flags & ISDOTDOT) == 0); 247 MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.')); 248 fuse_vnode_setparent(*vpp, dvp); 249 } 250 if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0) { 251 ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get"); 252 ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get"); 253 cache_enter(dvp, *vpp, cnp); 254 } 255 256 /* 257 * In userland, libfuse uses cached lookups for dot and dotdot entries, 258 * thus it does not really bump the nlookup counter for forget. 259 * Follow the same semantic and avoid tu bump it in order to keep 260 * nlookup counters consistent. 261 */ 262 if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 && 263 (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.'))) 264 VTOFUD(*vpp)->nlookup++; 265 266 return 0; 267 } 268 269 void 270 fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td) 271 { 272 /* 273 * Funcation is called for every vnode open. 274 * Merge fuse_open_flags it may be 0 275 */ 276 /* 277 * Ideally speaking, direct io should be enabled on 278 * fd's but do not see of any way of providing that 279 * this implementation. 280 * 281 * Also cannot think of a reason why would two 282 * different fd's on same vnode would like 283 * have DIRECT_IO turned on and off. But linux 284 * based implementation works on an fd not an 285 * inode and provides such a feature. 286 * 287 * XXXIP: Handle fd based DIRECT_IO 288 */ 289 if (fuse_open_flags & FOPEN_DIRECT_IO) { 290 ASSERT_VOP_ELOCKED(vp, __func__); 291 VTOFUD(vp)->flag |= FN_DIRECTIO; 292 fuse_io_invalbuf(vp, td); 293 } else { 294 if ((fuse_open_flags & FOPEN_KEEP_CACHE) == 0) 295 fuse_io_invalbuf(vp, td); 296 VTOFUD(vp)->flag &= ~FN_DIRECTIO; 297 } 298 299 if (vnode_vtype(vp) == VREG) { 300 /* XXXIP prevent getattr, by using cached node size */ 301 vnode_create_vobject(vp, 0, td); 302 } 303 } 304 305 int 306 fuse_vnode_savesize(struct vnode *vp, struct ucred *cred) 307 { 308 struct fuse_vnode_data *fvdat = VTOFUD(vp); 309 struct thread *td = curthread; 310 struct fuse_filehandle *fufh = NULL; 311 struct fuse_dispatcher fdi; 312 struct fuse_setattr_in *fsai; 313 int err = 0; 314 315 FS_DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp), 316 (uintmax_t)fvdat->filesize); 317 ASSERT_VOP_ELOCKED(vp, "fuse_io_extend"); 318 319 if (fuse_isdeadfs(vp)) { 320 return EBADF; 321 } 322 if (vnode_vtype(vp) == VDIR) { 323 return EISDIR; 324 } 325 if (vfs_isrdonly(vnode_mount(vp))) { 326 return EROFS; 327 } 328 if (cred == NULL) { 329 cred = td->td_ucred; 330 } 331 fdisp_init(&fdi, sizeof(*fsai)); 332 fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred); 333 fsai = fdi.indata; 334 fsai->valid = 0; 335 336 /* Truncate to a new value. */ 337 fsai->size = fvdat->filesize; 338 fsai->valid |= FATTR_SIZE; 339 340 fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh); 341 if (fufh) { 342 fsai->fh = fufh->fh_id; 343 fsai->valid |= FATTR_FH; 344 } 345 err = fdisp_wait_answ(&fdi); 346 fdisp_destroy(&fdi); 347 if (err == 0) 348 fvdat->flag &= ~FN_SIZECHANGE; 349 350 return err; 351 } 352 353 void 354 fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred) 355 { 356 357 struct fuse_vnode_data *fvdat = VTOFUD(vp); 358 struct vattr va; 359 360 if ((fvdat->flag & FN_SIZECHANGE) != 0 || 361 (fuse_refresh_size == 0 && fvdat->filesize != 0)) 362 return; 363 364 VOP_GETATTR(vp, &va, cred); 365 FS_DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize); 366 } 367 368 int 369 fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize) 370 { 371 struct fuse_vnode_data *fvdat = VTOFUD(vp); 372 off_t oldsize; 373 int err = 0; 374 375 FS_DEBUG("inode=%ju oldsize=%ju newsize=%ju\n", 376 (uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize, 377 (uintmax_t)newsize); 378 ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize"); 379 380 oldsize = fvdat->filesize; 381 fvdat->filesize = newsize; 382 fvdat->flag |= FN_SIZECHANGE; 383 384 if (newsize < oldsize) { 385 err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp)); 386 } 387 vnode_pager_setsize(vp, newsize); 388 return err; 389 } 390