| 1 | /* $NetBSD: nfs_clntsubs.c,v 1.2 2011/06/12 03:35:59 rmind Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Rick Macklem at The University of Guelph. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95 |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * Copyright 2000 Wasabi Systems, Inc. |
| 39 | * All rights reserved. |
| 40 | * |
| 41 | * Written by Frank van der Linden for Wasabi Systems, Inc. |
| 42 | * |
| 43 | * Redistribution and use in source and binary forms, with or without |
| 44 | * modification, are permitted provided that the following conditions |
| 45 | * are met: |
| 46 | * 1. Redistributions of source code must retain the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer. |
| 48 | * 2. Redistributions in binary form must reproduce the above copyright |
| 49 | * notice, this list of conditions and the following disclaimer in the |
| 50 | * documentation and/or other materials provided with the distribution. |
| 51 | * 3. All advertising materials mentioning features or use of this software |
| 52 | * must display the following acknowledgement: |
| 53 | * This product includes software developed for the NetBSD Project by |
| 54 | * Wasabi Systems, Inc. |
| 55 | * 4. The name of Wasabi Systems, Inc. may not be used to endorse |
| 56 | * or promote products derived from this software without specific prior |
| 57 | * written permission. |
| 58 | * |
| 59 | * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND |
| 60 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 61 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 62 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC |
| 63 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 64 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 65 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 66 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 67 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 68 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 69 | * POSSIBILITY OF SUCH DAMAGE. |
| 70 | */ |
| 71 | |
| 72 | #include <sys/cdefs.h> |
| 73 | __KERNEL_RCSID(0, "$NetBSD: nfs_clntsubs.c,v 1.2 2011/06/12 03:35:59 rmind Exp $" ); |
| 74 | |
| 75 | #ifdef _KERNEL_OPT |
| 76 | #include "opt_nfs.h" |
| 77 | #endif |
| 78 | |
| 79 | /* |
| 80 | * These functions support the macros and help fiddle mbuf chains for |
| 81 | * the nfs op functions. They do things like create the rpc header and |
| 82 | * copy data between mbuf chains and uio lists. |
| 83 | */ |
| 84 | #include <sys/param.h> |
| 85 | #include <sys/proc.h> |
| 86 | #include <sys/systm.h> |
| 87 | #include <sys/kernel.h> |
| 88 | #include <sys/kmem.h> |
| 89 | #include <sys/mount.h> |
| 90 | #include <sys/vnode.h> |
| 91 | #include <sys/namei.h> |
| 92 | #include <sys/mbuf.h> |
| 93 | #include <sys/socket.h> |
| 94 | #include <sys/stat.h> |
| 95 | #include <sys/filedesc.h> |
| 96 | #include <sys/time.h> |
| 97 | #include <sys/dirent.h> |
| 98 | #include <sys/once.h> |
| 99 | #include <sys/kauth.h> |
| 100 | #include <sys/atomic.h> |
| 101 | |
| 102 | #include <uvm/uvm_extern.h> |
| 103 | |
| 104 | #include <nfs/rpcv2.h> |
| 105 | #include <nfs/nfsproto.h> |
| 106 | #include <nfs/nfsnode.h> |
| 107 | #include <nfs/nfs.h> |
| 108 | #include <nfs/xdr_subs.h> |
| 109 | #include <nfs/nfsm_subs.h> |
| 110 | #include <nfs/nfsmount.h> |
| 111 | #include <nfs/nfsrtt.h> |
| 112 | #include <nfs/nfs_var.h> |
| 113 | |
| 114 | #include <miscfs/specfs/specdev.h> |
| 115 | |
| 116 | #include <netinet/in.h> |
| 117 | |
| 118 | /* |
| 119 | * Attribute cache routines. |
| 120 | * nfs_loadattrcache() - loads or updates the cache contents from attributes |
| 121 | * that are on the mbuf list |
| 122 | * nfs_getattrcache() - returns valid attributes if found in cache, returns |
| 123 | * error otherwise |
| 124 | */ |
| 125 | |
| 126 | /* |
| 127 | * Load the attribute cache (that lives in the nfsnode entry) with |
| 128 | * the values on the mbuf list and |
| 129 | * Iff vap not NULL |
| 130 | * copy the attributes to *vaper |
| 131 | */ |
| 132 | int |
| 133 | nfsm_loadattrcache(struct vnode **vpp, struct mbuf **mdp, char **dposp, struct vattr *vaper, int flags) |
| 134 | { |
| 135 | int32_t t1; |
| 136 | char *cp2; |
| 137 | int error = 0; |
| 138 | struct mbuf *md; |
| 139 | int v3 = NFS_ISV3(*vpp); |
| 140 | |
| 141 | md = *mdp; |
| 142 | t1 = (mtod(md, char *) + md->m_len) - *dposp; |
| 143 | error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2); |
| 144 | if (error) |
| 145 | return (error); |
| 146 | return nfs_loadattrcache(vpp, (struct nfs_fattr *)cp2, vaper, flags); |
| 147 | } |
| 148 | |
| 149 | int |
| 150 | nfs_loadattrcache(struct vnode **vpp, struct nfs_fattr *fp, struct vattr *vaper, int flags) |
| 151 | { |
| 152 | struct vnode *vp = *vpp; |
| 153 | struct vattr *vap; |
| 154 | int v3 = NFS_ISV3(vp); |
| 155 | enum vtype vtyp; |
| 156 | u_short vmode; |
| 157 | struct timespec mtime; |
| 158 | struct timespec ctime; |
| 159 | int32_t rdev; |
| 160 | struct nfsnode *np; |
| 161 | extern int (**spec_nfsv2nodeop_p)(void *); |
| 162 | uid_t uid; |
| 163 | gid_t gid; |
| 164 | |
| 165 | if (v3) { |
| 166 | vtyp = nfsv3tov_type(fp->fa_type); |
| 167 | vmode = fxdr_unsigned(u_short, fp->fa_mode); |
| 168 | rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1), |
| 169 | fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2)); |
| 170 | fxdr_nfsv3time(&fp->fa3_mtime, &mtime); |
| 171 | fxdr_nfsv3time(&fp->fa3_ctime, &ctime); |
| 172 | } else { |
| 173 | vtyp = nfsv2tov_type(fp->fa_type); |
| 174 | vmode = fxdr_unsigned(u_short, fp->fa_mode); |
| 175 | if (vtyp == VNON || vtyp == VREG) |
| 176 | vtyp = IFTOVT(vmode); |
| 177 | rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); |
| 178 | fxdr_nfsv2time(&fp->fa2_mtime, &mtime); |
| 179 | ctime.tv_sec = fxdr_unsigned(u_int32_t, |
| 180 | fp->fa2_ctime.nfsv2_sec); |
| 181 | ctime.tv_nsec = 0; |
| 182 | |
| 183 | /* |
| 184 | * Really ugly NFSv2 kludge. |
| 185 | */ |
| 186 | if (vtyp == VCHR && rdev == 0xffffffff) |
| 187 | vtyp = VFIFO; |
| 188 | } |
| 189 | |
| 190 | vmode &= ALLPERMS; |
| 191 | |
| 192 | /* |
| 193 | * If v_type == VNON it is a new node, so fill in the v_type, |
| 194 | * n_mtime fields. Check to see if it represents a special |
| 195 | * device, and if so, check for a possible alias. Once the |
| 196 | * correct vnode has been obtained, fill in the rest of the |
| 197 | * information. |
| 198 | */ |
| 199 | np = VTONFS(vp); |
| 200 | if (vp->v_type == VNON) { |
| 201 | vp->v_type = vtyp; |
| 202 | if (vp->v_type == VFIFO) { |
| 203 | extern int (**fifo_nfsv2nodeop_p)(void *); |
| 204 | vp->v_op = fifo_nfsv2nodeop_p; |
| 205 | } else if (vp->v_type == VREG) { |
| 206 | mutex_init(&np->n_commitlock, MUTEX_DEFAULT, IPL_NONE); |
| 207 | } else if (vp->v_type == VCHR || vp->v_type == VBLK) { |
| 208 | vp->v_op = spec_nfsv2nodeop_p; |
| 209 | spec_node_init(vp, (dev_t)rdev); |
| 210 | } |
| 211 | np->n_mtime = mtime; |
| 212 | } |
| 213 | uid = fxdr_unsigned(uid_t, fp->fa_uid); |
| 214 | gid = fxdr_unsigned(gid_t, fp->fa_gid); |
| 215 | vap = np->n_vattr; |
| 216 | |
| 217 | /* |
| 218 | * Invalidate access cache if uid, gid, mode or ctime changed. |
| 219 | */ |
| 220 | if (np->n_accstamp != -1 && |
| 221 | (gid != vap->va_gid || uid != vap->va_uid || vmode != vap->va_mode |
| 222 | || timespeccmp(&ctime, &vap->va_ctime, !=))) |
| 223 | np->n_accstamp = -1; |
| 224 | |
| 225 | vap->va_type = vtyp; |
| 226 | vap->va_mode = vmode; |
| 227 | vap->va_rdev = (dev_t)rdev; |
| 228 | vap->va_mtime = mtime; |
| 229 | vap->va_ctime = ctime; |
| 230 | vap->va_birthtime.tv_sec = VNOVAL; |
| 231 | vap->va_birthtime.tv_nsec = VNOVAL; |
| 232 | vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; |
| 233 | switch (vtyp) { |
| 234 | case VDIR: |
| 235 | vap->va_blocksize = NFS_DIRFRAGSIZ; |
| 236 | break; |
| 237 | case VBLK: |
| 238 | vap->va_blocksize = BLKDEV_IOSIZE; |
| 239 | break; |
| 240 | case VCHR: |
| 241 | vap->va_blocksize = MAXBSIZE; |
| 242 | break; |
| 243 | default: |
| 244 | vap->va_blocksize = v3 ? vp->v_mount->mnt_stat.f_iosize : |
| 245 | fxdr_unsigned(int32_t, fp->fa2_blocksize); |
| 246 | break; |
| 247 | } |
| 248 | if (v3) { |
| 249 | vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); |
| 250 | vap->va_uid = uid; |
| 251 | vap->va_gid = gid; |
| 252 | vap->va_size = fxdr_hyper(&fp->fa3_size); |
| 253 | vap->va_bytes = fxdr_hyper(&fp->fa3_used); |
| 254 | vap->va_fileid = fxdr_hyper(&fp->fa3_fileid); |
| 255 | fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); |
| 256 | vap->va_flags = 0; |
| 257 | vap->va_filerev = 0; |
| 258 | } else { |
| 259 | vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); |
| 260 | vap->va_uid = uid; |
| 261 | vap->va_gid = gid; |
| 262 | vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); |
| 263 | vap->va_bytes = fxdr_unsigned(int32_t, fp->fa2_blocks) |
| 264 | * NFS_FABLKSIZE; |
| 265 | vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); |
| 266 | fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); |
| 267 | vap->va_flags = 0; |
| 268 | vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec); |
| 269 | vap->va_filerev = 0; |
| 270 | } |
| 271 | if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { |
| 272 | return EFBIG; |
| 273 | } |
| 274 | if (vap->va_size != np->n_size) { |
| 275 | if ((np->n_flag & NMODIFIED) && vap->va_size < np->n_size) { |
| 276 | vap->va_size = np->n_size; |
| 277 | } else { |
| 278 | np->n_size = vap->va_size; |
| 279 | if (vap->va_type == VREG) { |
| 280 | /* |
| 281 | * we can't free pages if NAC_NOTRUNC because |
| 282 | * the pages can be owned by ourselves. |
| 283 | */ |
| 284 | if (flags & NAC_NOTRUNC) { |
| 285 | np->n_flag |= NTRUNCDELAYED; |
| 286 | } else { |
| 287 | genfs_node_wrlock(vp); |
| 288 | mutex_enter(vp->v_interlock); |
| 289 | (void)VOP_PUTPAGES(vp, 0, |
| 290 | 0, PGO_SYNCIO | PGO_CLEANIT | |
| 291 | PGO_FREE | PGO_ALLPAGES); |
| 292 | uvm_vnp_setsize(vp, np->n_size); |
| 293 | genfs_node_unlock(vp); |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | } |
| 298 | np->n_attrstamp = time_second; |
| 299 | if (vaper != NULL) { |
| 300 | memcpy((void *)vaper, (void *)vap, sizeof(*vap)); |
| 301 | if (np->n_flag & NCHG) { |
| 302 | if (np->n_flag & NACC) |
| 303 | vaper->va_atime = np->n_atim; |
| 304 | if (np->n_flag & NUPD) |
| 305 | vaper->va_mtime = np->n_mtim; |
| 306 | } |
| 307 | } |
| 308 | return (0); |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Check the time stamp |
| 313 | * If the cache is valid, copy contents to *vap and return 0 |
| 314 | * otherwise return an error |
| 315 | */ |
| 316 | int |
| 317 | nfs_getattrcache(struct vnode *vp, struct vattr *vaper) |
| 318 | { |
| 319 | struct nfsnode *np = VTONFS(vp); |
| 320 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 321 | struct vattr *vap; |
| 322 | |
| 323 | if (np->n_attrstamp == 0 || |
| 324 | (time_second - np->n_attrstamp) >= nfs_attrtimeo(nmp, np)) { |
| 325 | nfsstats.attrcache_misses++; |
| 326 | return (ENOENT); |
| 327 | } |
| 328 | nfsstats.attrcache_hits++; |
| 329 | vap = np->n_vattr; |
| 330 | if (vap->va_size != np->n_size) { |
| 331 | if (vap->va_type == VREG) { |
| 332 | if ((np->n_flag & NMODIFIED) != 0 && |
| 333 | vap->va_size < np->n_size) { |
| 334 | vap->va_size = np->n_size; |
| 335 | } else { |
| 336 | np->n_size = vap->va_size; |
| 337 | } |
| 338 | genfs_node_wrlock(vp); |
| 339 | uvm_vnp_setsize(vp, np->n_size); |
| 340 | genfs_node_unlock(vp); |
| 341 | } else |
| 342 | np->n_size = vap->va_size; |
| 343 | } |
| 344 | memcpy((void *)vaper, (void *)vap, sizeof(struct vattr)); |
| 345 | if (np->n_flag & NCHG) { |
| 346 | if (np->n_flag & NACC) |
| 347 | vaper->va_atime = np->n_atim; |
| 348 | if (np->n_flag & NUPD) |
| 349 | vaper->va_mtime = np->n_mtim; |
| 350 | } |
| 351 | return (0); |
| 352 | } |
| 353 | |
| 354 | void |
| 355 | nfs_delayedtruncate(struct vnode *vp) |
| 356 | { |
| 357 | struct nfsnode *np = VTONFS(vp); |
| 358 | |
| 359 | if (np->n_flag & NTRUNCDELAYED) { |
| 360 | np->n_flag &= ~NTRUNCDELAYED; |
| 361 | genfs_node_wrlock(vp); |
| 362 | mutex_enter(vp->v_interlock); |
| 363 | (void)VOP_PUTPAGES(vp, 0, |
| 364 | 0, PGO_SYNCIO | PGO_CLEANIT | PGO_FREE | PGO_ALLPAGES); |
| 365 | uvm_vnp_setsize(vp, np->n_size); |
| 366 | genfs_node_unlock(vp); |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | #define NFS_WCCKLUDGE_TIMEOUT (24 * 60 * 60) /* 1 day */ |
| 371 | #define NFS_WCCKLUDGE(nmp, now) \ |
| 372 | (((nmp)->nm_iflag & NFSMNT_WCCKLUDGE) && \ |
| 373 | ((now) - (nmp)->nm_wcckludgetime - NFS_WCCKLUDGE_TIMEOUT) < 0) |
| 374 | |
| 375 | /* |
| 376 | * nfs_check_wccdata: check inaccurate wcc_data |
| 377 | * |
| 378 | * => return non-zero if we shouldn't trust the wcc_data. |
| 379 | * => NFS_WCCKLUDGE_TIMEOUT is for the case that the server is "fixed". |
| 380 | */ |
| 381 | |
| 382 | int |
| 383 | nfs_check_wccdata(struct nfsnode *np, const struct timespec *ctime, |
| 384 | struct timespec *mtime, bool docheck) |
| 385 | { |
| 386 | int error = 0; |
| 387 | |
| 388 | #if !defined(NFS_V2_ONLY) |
| 389 | |
| 390 | if (docheck) { |
| 391 | struct vnode *vp = NFSTOV(np); |
| 392 | struct nfsmount *nmp; |
| 393 | long now = time_second; |
| 394 | const struct timespec *omtime = &np->n_vattr->va_mtime; |
| 395 | const struct timespec *octime = &np->n_vattr->va_ctime; |
| 396 | const char *reason = NULL; /* XXX: gcc */ |
| 397 | |
| 398 | if (timespeccmp(omtime, mtime, <=)) { |
| 399 | reason = "mtime" ; |
| 400 | error = EINVAL; |
| 401 | } |
| 402 | |
| 403 | if (vp->v_type == VDIR && timespeccmp(octime, ctime, <=)) { |
| 404 | reason = "ctime" ; |
| 405 | error = EINVAL; |
| 406 | } |
| 407 | |
| 408 | nmp = VFSTONFS(vp->v_mount); |
| 409 | if (error) { |
| 410 | |
| 411 | /* |
| 412 | * despite of the fact that we've updated the file, |
| 413 | * timestamps of the file were not updated as we |
| 414 | * expected. |
| 415 | * it means that the server has incompatible |
| 416 | * semantics of timestamps or (more likely) |
| 417 | * the server time is not precise enough to |
| 418 | * track each modifications. |
| 419 | * in that case, we disable wcc processing. |
| 420 | * |
| 421 | * yes, strictly speaking, we should disable all |
| 422 | * caching. it's a compromise. |
| 423 | */ |
| 424 | |
| 425 | mutex_enter(&nmp->nm_lock); |
| 426 | if (!NFS_WCCKLUDGE(nmp, now)) { |
| 427 | printf("%s: inaccurate wcc data (%s) detected," |
| 428 | " disabling wcc" |
| 429 | " (ctime %u.%09u %u.%09u," |
| 430 | " mtime %u.%09u %u.%09u)\n" , |
| 431 | vp->v_mount->mnt_stat.f_mntfromname, |
| 432 | reason, |
| 433 | (unsigned int)octime->tv_sec, |
| 434 | (unsigned int)octime->tv_nsec, |
| 435 | (unsigned int)ctime->tv_sec, |
| 436 | (unsigned int)ctime->tv_nsec, |
| 437 | (unsigned int)omtime->tv_sec, |
| 438 | (unsigned int)omtime->tv_nsec, |
| 439 | (unsigned int)mtime->tv_sec, |
| 440 | (unsigned int)mtime->tv_nsec); |
| 441 | } |
| 442 | nmp->nm_iflag |= NFSMNT_WCCKLUDGE; |
| 443 | nmp->nm_wcckludgetime = now; |
| 444 | mutex_exit(&nmp->nm_lock); |
| 445 | } else if (NFS_WCCKLUDGE(nmp, now)) { |
| 446 | error = EPERM; /* XXX */ |
| 447 | } else if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) { |
| 448 | mutex_enter(&nmp->nm_lock); |
| 449 | if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) { |
| 450 | printf("%s: re-enabling wcc\n" , |
| 451 | vp->v_mount->mnt_stat.f_mntfromname); |
| 452 | nmp->nm_iflag &= ~NFSMNT_WCCKLUDGE; |
| 453 | } |
| 454 | mutex_exit(&nmp->nm_lock); |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | #endif /* !defined(NFS_V2_ONLY) */ |
| 459 | |
| 460 | return error; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * Heuristic to see if the server XDR encodes directory cookies or not. |
| 465 | * it is not supposed to, but a lot of servers may do this. Also, since |
| 466 | * most/all servers will implement V2 as well, it is expected that they |
| 467 | * may return just 32 bits worth of cookie information, so we need to |
| 468 | * find out in which 32 bits this information is available. We do this |
| 469 | * to avoid trouble with emulated binaries that can't handle 64 bit |
| 470 | * directory offsets. |
| 471 | */ |
| 472 | |
| 473 | void |
| 474 | nfs_cookieheuristic(struct vnode *vp, int *flagp, struct lwp *l, kauth_cred_t cred) |
| 475 | { |
| 476 | struct uio auio; |
| 477 | struct iovec aiov; |
| 478 | char *tbuf, *cp; |
| 479 | struct dirent *dp; |
| 480 | off_t *cookies = NULL, *cop; |
| 481 | int error, eof, nc, len; |
| 482 | |
| 483 | tbuf = malloc(NFS_DIRFRAGSIZ, M_TEMP, M_WAITOK); |
| 484 | |
| 485 | aiov.iov_base = tbuf; |
| 486 | aiov.iov_len = NFS_DIRFRAGSIZ; |
| 487 | auio.uio_iov = &aiov; |
| 488 | auio.uio_iovcnt = 1; |
| 489 | auio.uio_rw = UIO_READ; |
| 490 | auio.uio_resid = NFS_DIRFRAGSIZ; |
| 491 | auio.uio_offset = 0; |
| 492 | UIO_SETUP_SYSSPACE(&auio); |
| 493 | |
| 494 | error = VOP_READDIR(vp, &auio, cred, &eof, &cookies, &nc); |
| 495 | |
| 496 | len = NFS_DIRFRAGSIZ - auio.uio_resid; |
| 497 | if (error || len == 0) { |
| 498 | free(tbuf, M_TEMP); |
| 499 | if (cookies) |
| 500 | free(cookies, M_TEMP); |
| 501 | return; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * Find the first valid entry and look at its offset cookie. |
| 506 | */ |
| 507 | |
| 508 | cp = tbuf; |
| 509 | for (cop = cookies; len > 0; len -= dp->d_reclen) { |
| 510 | dp = (struct dirent *)cp; |
| 511 | if (dp->d_fileno != 0 && len >= dp->d_reclen) { |
| 512 | if ((*cop >> 32) != 0 && (*cop & 0xffffffffLL) == 0) { |
| 513 | *flagp |= NFSMNT_SWAPCOOKIE; |
| 514 | nfs_invaldircache(vp, 0); |
| 515 | nfs_vinvalbuf(vp, 0, cred, l, 1); |
| 516 | } |
| 517 | break; |
| 518 | } |
| 519 | cop++; |
| 520 | cp += dp->d_reclen; |
| 521 | } |
| 522 | |
| 523 | free(tbuf, M_TEMP); |
| 524 | free(cookies, M_TEMP); |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Set the attribute timeout based on how recently the file has been modified. |
| 529 | */ |
| 530 | |
| 531 | time_t |
| 532 | nfs_attrtimeo(struct nfsmount *nmp, struct nfsnode *np) |
| 533 | { |
| 534 | time_t timeo; |
| 535 | |
| 536 | if ((nmp->nm_flag & NFSMNT_NOAC) != 0) |
| 537 | return 0; |
| 538 | |
| 539 | if (((np)->n_flag & NMODIFIED) != 0) |
| 540 | return NFS_MINATTRTIMO; |
| 541 | |
| 542 | timeo = (time_second - np->n_mtime.tv_sec) / 10; |
| 543 | timeo = max(timeo, NFS_MINATTRTIMO); |
| 544 | timeo = min(timeo, NFS_MAXATTRTIMO); |
| 545 | return timeo; |
| 546 | } |
| 547 | |