1241519Sattilio/* 2241519Sattilio * Copyright (c) 2007-2009 Google Inc. and Amit Singh 3241519Sattilio * All rights reserved. 4241519Sattilio * 5241519Sattilio * Redistribution and use in source and binary forms, with or without 6241519Sattilio * modification, are permitted provided that the following conditions are 7241519Sattilio * met: 8241519Sattilio * 9241519Sattilio * * Redistributions of source code must retain the above copyright 10241519Sattilio * notice, this list of conditions and the following disclaimer. 11241519Sattilio * * Redistributions in binary form must reproduce the above 12241519Sattilio * copyright notice, this list of conditions and the following disclaimer 13241519Sattilio * in the documentation and/or other materials provided with the 14241519Sattilio * distribution. 15241519Sattilio * * Neither the name of Google Inc. nor the names of its 16241519Sattilio * contributors may be used to endorse or promote products derived from 17241519Sattilio * this software without specific prior written permission. 18241519Sattilio * 19241519Sattilio * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20241519Sattilio * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21241519Sattilio * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22241519Sattilio * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23241519Sattilio * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24241519Sattilio * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25241519Sattilio * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26241519Sattilio * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27241519Sattilio * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28241519Sattilio * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29241519Sattilio * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30241519Sattilio * 31241519Sattilio * Copyright (C) 2005 Csaba Henk. 32241519Sattilio * All rights reserved. 33241519Sattilio * 34241519Sattilio * Redistribution and use in source and binary forms, with or without 35241519Sattilio * modification, are permitted provided that the following conditions 36241519Sattilio * are met: 37241519Sattilio * 1. Redistributions of source code must retain the above copyright 38241519Sattilio * notice, this list of conditions and the following disclaimer. 39241519Sattilio * 2. Redistributions in binary form must reproduce the above copyright 40241519Sattilio * notice, this list of conditions and the following disclaimer in the 41241519Sattilio * documentation and/or other materials provided with the distribution. 42241519Sattilio * 43241519Sattilio * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 44241519Sattilio * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45241519Sattilio * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46241519Sattilio * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 47241519Sattilio * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48241519Sattilio * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49241519Sattilio * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50241519Sattilio * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51241519Sattilio * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52241519Sattilio * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53241519Sattilio * SUCH DAMAGE. 54241519Sattilio */ 55241519Sattilio 56241519Sattilio#include <sys/cdefs.h> 57241519Sattilio__FBSDID("$FreeBSD$"); 58241519Sattilio 59241519Sattilio#include <sys/types.h> 60241519Sattilio#include <sys/module.h> 61241519Sattilio#include <sys/systm.h> 62241519Sattilio#include <sys/errno.h> 63241519Sattilio#include <sys/param.h> 64241519Sattilio#include <sys/kernel.h> 65241519Sattilio#include <sys/conf.h> 66241519Sattilio#include <sys/uio.h> 67241519Sattilio#include <sys/malloc.h> 68241519Sattilio#include <sys/queue.h> 69241519Sattilio#include <sys/lock.h> 70241519Sattilio#include <sys/sx.h> 71241519Sattilio#include <sys/mutex.h> 72241519Sattilio#include <sys/proc.h> 73241519Sattilio#include <sys/vnode.h> 74241519Sattilio#include <sys/namei.h> 75241519Sattilio#include <sys/mount.h> 76241519Sattilio#include <sys/sysctl.h> 77241519Sattilio#include <sys/fcntl.h> 78241519Sattilio#include <sys/fnv_hash.h> 79241519Sattilio#include <sys/priv.h> 80241519Sattilio#include <security/mac/mac_framework.h> 81241519Sattilio#include <vm/vm.h> 82241519Sattilio#include <vm/vm_extern.h> 83241519Sattilio 84241519Sattilio#include "fuse.h" 85241519Sattilio#include "fuse_node.h" 86241519Sattilio#include "fuse_internal.h" 87241519Sattilio#include "fuse_io.h" 88241519Sattilio#include "fuse_ipc.h" 89241519Sattilio 90241519Sattilio#define FUSE_DEBUG_MODULE VNOPS 91241519Sattilio#include "fuse_debug.h" 92241519Sattilio 93241519SattilioMALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data"); 94241519Sattilio 95241519Sattiliostatic int fuse_node_count = 0; 96241519Sattilio 97241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD, 98241519Sattilio &fuse_node_count, 0, ""); 99241519Sattilio 100241519Sattilioint fuse_data_cache_enable = 1; 101241519Sattilio 102241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW, 103241519Sattilio &fuse_data_cache_enable, 0, ""); 104241519Sattilio 105241519Sattilioint fuse_data_cache_invalidate = 0; 106241519Sattilio 107241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW, 108241519Sattilio &fuse_data_cache_invalidate, 0, ""); 109241519Sattilio 110241519Sattilioint fuse_mmap_enable = 1; 111241519Sattilio 112241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW, 113241519Sattilio &fuse_mmap_enable, 0, ""); 114241519Sattilio 115241519Sattilioint fuse_refresh_size = 0; 116241519Sattilio 117241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW, 118241519Sattilio &fuse_refresh_size, 0, ""); 119241519Sattilio 120241519Sattilioint fuse_sync_resize = 1; 121241519Sattilio 122241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW, 123241519Sattilio &fuse_sync_resize, 0, ""); 124241519Sattilio 125241519Sattilioint fuse_fix_broken_io = 0; 126241519Sattilio 127241519SattilioSYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW, 128241519Sattilio &fuse_fix_broken_io, 0, ""); 129241519Sattilio 130241519Sattiliostatic void 131241519Sattiliofuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat, 132241519Sattilio uint64_t nodeid, enum vtype vtyp) 133241519Sattilio{ 134241519Sattilio int i; 135241519Sattilio 136241519Sattilio fvdat->nid = nodeid; 137241519Sattilio if (nodeid == FUSE_ROOT_ID) { 138241519Sattilio vp->v_vflag |= VV_ROOT; 139241519Sattilio } 140241519Sattilio vp->v_type = vtyp; 141241519Sattilio vp->v_data = fvdat; 142241519Sattilio 143241519Sattilio for (i = 0; i < FUFH_MAXTYPE; i++) 144241519Sattilio fvdat->fufh[i].fh_type = FUFH_INVALID; 145241519Sattilio 146241519Sattilio atomic_add_acq_int(&fuse_node_count, 1); 147241519Sattilio} 148241519Sattilio 149241519Sattiliovoid 150241519Sattiliofuse_vnode_destroy(struct vnode *vp) 151241519Sattilio{ 152241519Sattilio struct fuse_vnode_data *fvdat = vp->v_data; 153241519Sattilio 154241519Sattilio vp->v_data = NULL; 155241519Sattilio free(fvdat, M_FUSEVN); 156241519Sattilio 157241519Sattilio atomic_subtract_acq_int(&fuse_node_count, 1); 158241519Sattilio} 159241519Sattilio 160241519Sattiliostatic int 161241519Sattiliofuse_vnode_cmp(struct vnode *vp, void *nidp) 162241519Sattilio{ 163241519Sattilio return (VTOI(vp) != *((uint64_t *)nidp)); 164241519Sattilio} 165241519Sattilio 166241519Sattiliostatic uint32_t __inline 167241519Sattiliofuse_vnode_hash(uint64_t id) 168241519Sattilio{ 169241519Sattilio return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT)); 170241519Sattilio} 171241519Sattilio 172241519Sattiliostatic int 173241519Sattiliofuse_vnode_alloc(struct mount *mp, 174241519Sattilio struct thread *td, 175241519Sattilio uint64_t nodeid, 176241519Sattilio enum vtype vtyp, 177241519Sattilio struct vnode **vpp) 178241519Sattilio{ 179241519Sattilio struct fuse_vnode_data *fvdat; 180241519Sattilio struct vnode *vp2; 181241519Sattilio int err = 0; 182241519Sattilio 183241521Sattilio FS_DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid); 184241519Sattilio 185241519Sattilio if (vtyp == VNON) { 186241519Sattilio return EINVAL; 187241519Sattilio } 188241519Sattilio *vpp = NULL; 189241519Sattilio err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp, 190241519Sattilio fuse_vnode_cmp, &nodeid); 191241519Sattilio if (err) 192241519Sattilio return (err); 193241519Sattilio 194241519Sattilio if (*vpp) { 195241519Sattilio MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL); 196241521Sattilio FS_DEBUG("vnode taken from hash\n"); 197241519Sattilio return (0); 198241519Sattilio } 199241519Sattilio fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO); 200241519Sattilio err = getnewvnode("fuse", mp, &fuse_vnops, vpp); 201241519Sattilio if (err) { 202241519Sattilio free(fvdat, M_FUSEVN); 203241519Sattilio return (err); 204241519Sattilio } 205241519Sattilio lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL); 206241519Sattilio fuse_vnode_init(*vpp, fvdat, nodeid, vtyp); 207241519Sattilio err = insmntque(*vpp, mp); 208241519Sattilio ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); 209241519Sattilio if (err) { 210241519Sattilio free(fvdat, M_FUSEVN); 211241519Sattilio *vpp = NULL; 212241519Sattilio return (err); 213241519Sattilio } 214241519Sattilio err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, 215241519Sattilio td, &vp2, fuse_vnode_cmp, &nodeid); 216241519Sattilio if (err) 217241519Sattilio return (err); 218241519Sattilio if (vp2 != NULL) { 219241519Sattilio *vpp = vp2; 220241519Sattilio return (0); 221241519Sattilio } 222241519Sattilio 223241519Sattilio ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); 224241519Sattilio 225241519Sattilio return (0); 226241519Sattilio} 227241519Sattilio 228241519Sattilioint 229241519Sattiliofuse_vnode_get(struct mount *mp, 230241519Sattilio uint64_t nodeid, 231241519Sattilio struct vnode *dvp, 232241519Sattilio struct vnode **vpp, 233241519Sattilio struct componentname *cnp, 234241519Sattilio enum vtype vtyp) 235241519Sattilio{ 236241519Sattilio struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread); 237241519Sattilio int err = 0; 238241519Sattilio 239241519Sattilio debug_printf("dvp=%p\n", dvp); 240241519Sattilio 241241519Sattilio err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp); 242241519Sattilio if (err) { 243241519Sattilio return err; 244241519Sattilio } 245241519Sattilio if (dvp != NULL) { 246241519Sattilio MPASS((cnp->cn_flags & ISDOTDOT) == 0); 247241519Sattilio MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.')); 248241519Sattilio fuse_vnode_setparent(*vpp, dvp); 249241519Sattilio } 250241519Sattilio if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0) { 251241519Sattilio ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get"); 252241519Sattilio ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get"); 253241519Sattilio cache_enter(dvp, *vpp, cnp); 254241519Sattilio } 255241519Sattilio 256241519Sattilio /* 257241519Sattilio * In userland, libfuse uses cached lookups for dot and dotdot entries, 258241519Sattilio * thus it does not really bump the nlookup counter for forget. 259241519Sattilio * Follow the same semantic and avoid tu bump it in order to keep 260241519Sattilio * nlookup counters consistent. 261241519Sattilio */ 262241519Sattilio if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 && 263241519Sattilio (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.'))) 264241519Sattilio VTOFUD(*vpp)->nlookup++; 265241519Sattilio 266241519Sattilio return 0; 267241519Sattilio} 268241519Sattilio 269241519Sattiliovoid 270241519Sattiliofuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td) 271241519Sattilio{ 272241519Sattilio /* 273241519Sattilio * Funcation is called for every vnode open. 274241519Sattilio * Merge fuse_open_flags it may be 0 275241519Sattilio * 276282960Strasz * XXXIP: Handle FOPEN_KEEP_CACHE 277241519Sattilio */ 278282960Strasz /* 279282960Strasz * Ideally speaking, direct io should be enabled on 280282960Strasz * fd's but do not see of any way of providing that 281282960Strasz * this implementation. 282241519Sattilio 283282960Strasz * Also cannot think of a reason why would two 284282960Strasz * different fd's on same vnode would like 285282960Strasz * have DIRECT_IO turned on and off. But linux 286282960Strasz * based implementation works on an fd not an 287282960Strasz * inode and provides such a feature. 288282960Strasz * 289282960Strasz * XXXIP: Handle fd based DIRECT_IO 290282960Strasz */ 291282960Strasz if (fuse_open_flags & FOPEN_DIRECT_IO) { 292300977Srmacklem ASSERT_VOP_ELOCKED(vp, __func__); 293282960Strasz VTOFUD(vp)->flag |= FN_DIRECTIO; 294300977Srmacklem fuse_io_invalbuf(vp, td); 295282960Strasz } else { 296282960Strasz VTOFUD(vp)->flag &= ~FN_DIRECTIO; 297282960Strasz } 298282960Strasz 299241519Sattilio if (vnode_vtype(vp) == VREG) { 300241519Sattilio /* XXXIP prevent getattr, by using cached node size */ 301241519Sattilio vnode_create_vobject(vp, 0, td); 302241519Sattilio } 303241519Sattilio} 304241519Sattilio 305241519Sattilioint 306241519Sattiliofuse_vnode_savesize(struct vnode *vp, struct ucred *cred) 307241519Sattilio{ 308241519Sattilio struct fuse_vnode_data *fvdat = VTOFUD(vp); 309241519Sattilio struct thread *td = curthread; 310241519Sattilio struct fuse_filehandle *fufh = NULL; 311241519Sattilio struct fuse_dispatcher fdi; 312241519Sattilio struct fuse_setattr_in *fsai; 313241519Sattilio int err = 0; 314241519Sattilio 315241521Sattilio FS_DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp), 316241519Sattilio (uintmax_t)fvdat->filesize); 317241519Sattilio ASSERT_VOP_ELOCKED(vp, "fuse_io_extend"); 318241519Sattilio 319241519Sattilio if (fuse_isdeadfs(vp)) { 320241519Sattilio return EBADF; 321241519Sattilio } 322241519Sattilio if (vnode_vtype(vp) == VDIR) { 323241519Sattilio return EISDIR; 324241519Sattilio } 325241519Sattilio if (vfs_isrdonly(vnode_mount(vp))) { 326241519Sattilio return EROFS; 327241519Sattilio } 328241519Sattilio if (cred == NULL) { 329241519Sattilio cred = td->td_ucred; 330241519Sattilio } 331241519Sattilio fdisp_init(&fdi, sizeof(*fsai)); 332241519Sattilio fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred); 333241519Sattilio fsai = fdi.indata; 334241519Sattilio fsai->valid = 0; 335241519Sattilio 336241519Sattilio /* Truncate to a new value. */ 337241519Sattilio fsai->size = fvdat->filesize; 338241519Sattilio fsai->valid |= FATTR_SIZE; 339241519Sattilio 340241519Sattilio fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh); 341241519Sattilio if (fufh) { 342241519Sattilio fsai->fh = fufh->fh_id; 343241519Sattilio fsai->valid |= FATTR_FH; 344241519Sattilio } 345241519Sattilio err = fdisp_wait_answ(&fdi); 346241519Sattilio fdisp_destroy(&fdi); 347241519Sattilio if (err == 0) 348241519Sattilio fvdat->flag &= ~FN_SIZECHANGE; 349241519Sattilio 350241519Sattilio return err; 351241519Sattilio} 352241519Sattilio 353241519Sattiliovoid 354241519Sattiliofuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred) 355241519Sattilio{ 356241519Sattilio 357241519Sattilio struct fuse_vnode_data *fvdat = VTOFUD(vp); 358241519Sattilio struct vattr va; 359241519Sattilio 360241519Sattilio if ((fvdat->flag & FN_SIZECHANGE) != 0 || 361242727Sattilio (fuse_refresh_size == 0 && fvdat->filesize != 0)) 362241519Sattilio return; 363241519Sattilio 364241519Sattilio VOP_GETATTR(vp, &va, cred); 365241521Sattilio FS_DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize); 366241519Sattilio} 367241519Sattilio 368241519Sattilioint 369241519Sattiliofuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize) 370241519Sattilio{ 371241519Sattilio struct fuse_vnode_data *fvdat = VTOFUD(vp); 372241519Sattilio off_t oldsize; 373241519Sattilio int err = 0; 374241519Sattilio 375241521Sattilio FS_DEBUG("inode=%ju oldsize=%ju newsize=%ju\n", 376241519Sattilio (uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize, 377241519Sattilio (uintmax_t)newsize); 378241519Sattilio ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize"); 379241519Sattilio 380241519Sattilio oldsize = fvdat->filesize; 381241519Sattilio fvdat->filesize = newsize; 382241519Sattilio fvdat->flag |= FN_SIZECHANGE; 383241519Sattilio 384241519Sattilio if (newsize < oldsize) { 385241519Sattilio err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp)); 386241519Sattilio } 387241519Sattilio vnode_pager_setsize(vp, newsize); 388241519Sattilio return err; 389241519Sattilio} 390