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sys/nfsclient/nfs_vnops.c
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1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/10.1/sys/nfsclient/nfs_vnops.c 252479 2013-07-01 21:16:19Z rmacklem $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2 and 3 40 */ 41 42 #include "opt_inet.h" 43 #include "opt_kdtrace.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/systm.h> 48 #include <sys/resourcevar.h> 49 #include <sys/proc.h> 50 #include <sys/mount.h> 51 #include <sys/bio.h> 52 #include <sys/buf.h> 53 #include <sys/jail.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/namei.h> 57 #include <sys/socket.h> 58 #include <sys/vnode.h> 59 #include <sys/dirent.h> 60 #include <sys/fcntl.h> 61 #include <sys/lockf.h> 62 #include <sys/stat.h> 63 #include <sys/sysctl.h> 64 #include <sys/signalvar.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vm_object.h> 69 70 #include <nfs/nfsproto.h> 71 #include <nfsclient/nfs.h> 72 #include <nfsclient/nfsnode.h> 73 #include <nfsclient/nfsmount.h> 74 #include <nfs/nfs_kdtrace.h> 75 #include <nfs/nfs_lock.h> 76 #include <nfs/xdr_subs.h> 77 #include <nfsclient/nfsm_subs.h> 78 79 #include <net/if.h> 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 83 #include <machine/stdarg.h> 84 85 #ifdef KDTRACE_HOOKS 86 #include <sys/dtrace_bsd.h> 87 88 dtrace_nfsclient_accesscache_flush_probe_func_t 89 dtrace_nfsclient_accesscache_flush_done_probe; 90 uint32_t nfsclient_accesscache_flush_done_id; 91 92 dtrace_nfsclient_accesscache_get_probe_func_t 93 dtrace_nfsclient_accesscache_get_hit_probe, 94 dtrace_nfsclient_accesscache_get_miss_probe; 95 uint32_t nfsclient_accesscache_get_hit_id; 96 uint32_t nfsclient_accesscache_get_miss_id; 97 98 dtrace_nfsclient_accesscache_load_probe_func_t 99 dtrace_nfsclient_accesscache_load_done_probe; 100 uint32_t nfsclient_accesscache_load_done_id; 101 #endif /* !KDTRACE_HOOKS */ 102 103 /* Defs */ 104 #define TRUE 1 105 #define FALSE 0 106 107 /* 108 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 109 * calls are not in getblk() and brelse() so that they would not be necessary 110 * here. 111 */ 112 #ifndef B_VMIO 113 #define vfs_busy_pages(bp, f) 114 #endif 115 116 static vop_read_t nfsfifo_read; 117 static vop_write_t nfsfifo_write; 118 static vop_close_t nfsfifo_close; 119 static int nfs_flush(struct vnode *, int, int); 120 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *); 121 static vop_lookup_t nfs_lookup; 122 static vop_create_t nfs_create; 123 static vop_mknod_t nfs_mknod; 124 static vop_open_t nfs_open; 125 static vop_close_t nfs_close; 126 static vop_access_t nfs_access; 127 static vop_getattr_t nfs_getattr; 128 static vop_setattr_t nfs_setattr; 129 static vop_read_t nfs_read; 130 static vop_fsync_t nfs_fsync; 131 static vop_remove_t nfs_remove; 132 static vop_link_t nfs_link; 133 static vop_rename_t nfs_rename; 134 static vop_mkdir_t nfs_mkdir; 135 static vop_rmdir_t nfs_rmdir; 136 static vop_symlink_t nfs_symlink; 137 static vop_readdir_t nfs_readdir; 138 static vop_strategy_t nfs_strategy; 139 static int nfs_lookitup(struct vnode *, const char *, int, 140 struct ucred *, struct thread *, struct nfsnode **); 141 static int nfs_sillyrename(struct vnode *, struct vnode *, 142 struct componentname *); 143 static vop_access_t nfsspec_access; 144 static vop_readlink_t nfs_readlink; 145 static vop_print_t nfs_print; 146 static vop_advlock_t nfs_advlock; 147 static vop_advlockasync_t nfs_advlockasync; 148 149 /* 150 * Global vfs data structures for nfs 151 */ 152 struct vop_vector nfs_vnodeops = { 153 .vop_default = &default_vnodeops, 154 .vop_access = nfs_access, 155 .vop_advlock = nfs_advlock, 156 .vop_advlockasync = nfs_advlockasync, 157 .vop_close = nfs_close, 158 .vop_create = nfs_create, 159 .vop_fsync = nfs_fsync, 160 .vop_getattr = nfs_getattr, 161 .vop_getpages = nfs_getpages, 162 .vop_putpages = nfs_putpages, 163 .vop_inactive = nfs_inactive, 164 .vop_link = nfs_link, 165 .vop_lookup = nfs_lookup, 166 .vop_mkdir = nfs_mkdir, 167 .vop_mknod = nfs_mknod, 168 .vop_open = nfs_open, 169 .vop_print = nfs_print, 170 .vop_read = nfs_read, 171 .vop_readdir = nfs_readdir, 172 .vop_readlink = nfs_readlink, 173 .vop_reclaim = nfs_reclaim, 174 .vop_remove = nfs_remove, 175 .vop_rename = nfs_rename, 176 .vop_rmdir = nfs_rmdir, 177 .vop_setattr = nfs_setattr, 178 .vop_strategy = nfs_strategy, 179 .vop_symlink = nfs_symlink, 180 .vop_write = nfs_write, 181 }; 182 183 struct vop_vector nfs_fifoops = { 184 .vop_default = &fifo_specops, 185 .vop_access = nfsspec_access, 186 .vop_close = nfsfifo_close, 187 .vop_fsync = nfs_fsync, 188 .vop_getattr = nfs_getattr, 189 .vop_inactive = nfs_inactive, 190 .vop_print = nfs_print, 191 .vop_read = nfsfifo_read, 192 .vop_reclaim = nfs_reclaim, 193 .vop_setattr = nfs_setattr, 194 .vop_write = nfsfifo_write, 195 }; 196 197 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 198 struct componentname *cnp, struct vattr *vap); 199 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 200 struct ucred *cred, struct thread *td); 201 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 202 int fnamelen, struct vnode *tdvp, 203 const char *tnameptr, int tnamelen, 204 struct ucred *cred, struct thread *td); 205 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 206 struct sillyrename *sp); 207 208 /* 209 * Global variables 210 */ 211 struct mtx nfs_iod_mtx; 212 enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON]; 213 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 214 int nfs_numasync = 0; 215 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 216 217 SYSCTL_DECL(_vfs_oldnfs); 218 219 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 220 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 221 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 222 223 static int nfs_prime_access_cache = 0; 224 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 225 &nfs_prime_access_cache, 0, 226 "Prime NFS ACCESS cache when fetching attributes"); 227 228 static int nfsv3_commit_on_close = 0; 229 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 230 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 231 232 static int nfs_clean_pages_on_close = 1; 233 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 234 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 235 236 int nfs_directio_enable = 0; 237 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 238 &nfs_directio_enable, 0, "Enable NFS directio"); 239 240 /* 241 * This sysctl allows other processes to mmap a file that has been opened 242 * O_DIRECT by a process. In general, having processes mmap the file while 243 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 244 * this by default to prevent DoS attacks - to prevent a malicious user from 245 * opening up files O_DIRECT preventing other users from mmap'ing these 246 * files. "Protected" environments where stricter consistency guarantees are 247 * required can disable this knob. The process that opened the file O_DIRECT 248 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 249 * meaningful. 250 */ 251 int nfs_directio_allow_mmap = 1; 252 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 253 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 254 255 #if 0 256 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 257 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 258 259 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 260 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 261 #endif 262 263 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 264 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 265 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 266 267 /* 268 * SMP Locking Note : 269 * The list of locks after the description of the lock is the ordering 270 * of other locks acquired with the lock held. 271 * np->n_mtx : Protects the fields in the nfsnode. 272 VM Object Lock 273 VI_MTX (acquired indirectly) 274 * nmp->nm_mtx : Protects the fields in the nfsmount. 275 rep->r_mtx 276 * nfs_iod_mtx : Global lock, protects shared nfsiod state. 277 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 278 nmp->nm_mtx 279 rep->r_mtx 280 * rep->r_mtx : Protects the fields in an nfsreq. 281 */ 282 283 static int 284 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 285 struct ucred *cred, uint32_t *retmode) 286 { 287 const int v3 = 1; 288 u_int32_t *tl; 289 int error = 0, attrflag, i, lrupos; 290 291 struct mbuf *mreq, *mrep, *md, *mb; 292 caddr_t bpos, dpos; 293 u_int32_t rmode; 294 struct nfsnode *np = VTONFS(vp); 295 296 nfsstats.rpccnt[NFSPROC_ACCESS]++; 297 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED, M_WAITOK, MT_DATA, 0); 298 mb = mreq; 299 bpos = mtod(mb, caddr_t); 300 nfsm_fhtom(vp, v3); 301 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 302 *tl = txdr_unsigned(wmode); 303 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 304 nfsm_postop_attr(vp, attrflag); 305 if (!error) { 306 lrupos = 0; 307 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 308 rmode = fxdr_unsigned(u_int32_t, *tl); 309 mtx_lock(&np->n_mtx); 310 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 311 if (np->n_accesscache[i].uid == cred->cr_uid) { 312 np->n_accesscache[i].mode = rmode; 313 np->n_accesscache[i].stamp = time_second; 314 break; 315 } 316 if (i > 0 && np->n_accesscache[i].stamp < 317 np->n_accesscache[lrupos].stamp) 318 lrupos = i; 319 } 320 if (i == NFS_ACCESSCACHESIZE) { 321 np->n_accesscache[lrupos].uid = cred->cr_uid; 322 np->n_accesscache[lrupos].mode = rmode; 323 np->n_accesscache[lrupos].stamp = time_second; 324 } 325 mtx_unlock(&np->n_mtx); 326 if (retmode != NULL) 327 *retmode = rmode; 328 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 329 } 330 m_freem(mrep); 331 nfsmout: 332 #ifdef KDTRACE_HOOKS 333 if (error) { 334 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 335 error); 336 } 337 #endif 338 return (error); 339 } 340 341 /* 342 * nfs access vnode op. 343 * For nfs version 2, just return ok. File accesses may fail later. 344 * For nfs version 3, use the access rpc to check accessibility. If file modes 345 * are changed on the server, accesses might still fail later. 346 */ 347 static int 348 nfs_access(struct vop_access_args *ap) 349 { 350 struct vnode *vp = ap->a_vp; 351 int error = 0, i, gotahit; 352 u_int32_t mode, rmode, wmode; 353 int v3 = NFS_ISV3(vp); 354 struct nfsnode *np = VTONFS(vp); 355 356 /* 357 * Disallow write attempts on filesystems mounted read-only; 358 * unless the file is a socket, fifo, or a block or character 359 * device resident on the filesystem. 360 */ 361 if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 362 switch (vp->v_type) { 363 case VREG: 364 case VDIR: 365 case VLNK: 366 return (EROFS); 367 default: 368 break; 369 } 370 } 371 /* 372 * For nfs v3, check to see if we have done this recently, and if 373 * so return our cached result instead of making an ACCESS call. 374 * If not, do an access rpc, otherwise you are stuck emulating 375 * ufs_access() locally using the vattr. This may not be correct, 376 * since the server may apply other access criteria such as 377 * client uid-->server uid mapping that we do not know about. 378 */ 379 if (v3) { 380 if (ap->a_accmode & VREAD) 381 mode = NFSV3ACCESS_READ; 382 else 383 mode = 0; 384 if (vp->v_type != VDIR) { 385 if (ap->a_accmode & VWRITE) 386 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 387 if (ap->a_accmode & VEXEC) 388 mode |= NFSV3ACCESS_EXECUTE; 389 } else { 390 if (ap->a_accmode & VWRITE) 391 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 392 NFSV3ACCESS_DELETE); 393 if (ap->a_accmode & VEXEC) 394 mode |= NFSV3ACCESS_LOOKUP; 395 } 396 /* XXX safety belt, only make blanket request if caching */ 397 if (nfsaccess_cache_timeout > 0) { 398 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 399 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 400 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 401 } else { 402 wmode = mode; 403 } 404 405 /* 406 * Does our cached result allow us to give a definite yes to 407 * this request? 408 */ 409 gotahit = 0; 410 mtx_lock(&np->n_mtx); 411 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 412 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 413 if (time_second < (np->n_accesscache[i].stamp + 414 nfsaccess_cache_timeout) && 415 (np->n_accesscache[i].mode & mode) == mode) { 416 nfsstats.accesscache_hits++; 417 gotahit = 1; 418 } 419 break; 420 } 421 } 422 mtx_unlock(&np->n_mtx); 423 #ifdef KDTRACE_HOOKS 424 if (gotahit) 425 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 426 ap->a_cred->cr_uid, mode); 427 else 428 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 429 ap->a_cred->cr_uid, mode); 430 #endif 431 if (gotahit == 0) { 432 /* 433 * Either a no, or a don't know. Go to the wire. 434 */ 435 nfsstats.accesscache_misses++; 436 error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred, 437 &rmode); 438 if (!error) { 439 if ((rmode & mode) != mode) 440 error = EACCES; 441 } 442 } 443 return (error); 444 } else { 445 if ((error = nfsspec_access(ap)) != 0) { 446 return (error); 447 } 448 /* 449 * Attempt to prevent a mapped root from accessing a file 450 * which it shouldn't. We try to read a byte from the file 451 * if the user is root and the file is not zero length. 452 * After calling nfsspec_access, we should have the correct 453 * file size cached. 454 */ 455 mtx_lock(&np->n_mtx); 456 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 457 && VTONFS(vp)->n_size > 0) { 458 struct iovec aiov; 459 struct uio auio; 460 char buf[1]; 461 462 mtx_unlock(&np->n_mtx); 463 aiov.iov_base = buf; 464 aiov.iov_len = 1; 465 auio.uio_iov = &aiov; 466 auio.uio_iovcnt = 1; 467 auio.uio_offset = 0; 468 auio.uio_resid = 1; 469 auio.uio_segflg = UIO_SYSSPACE; 470 auio.uio_rw = UIO_READ; 471 auio.uio_td = ap->a_td; 472 473 if (vp->v_type == VREG) 474 error = nfs_readrpc(vp, &auio, ap->a_cred); 475 else if (vp->v_type == VDIR) { 476 char* bp; 477 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 478 aiov.iov_base = bp; 479 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 480 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 481 free(bp, M_TEMP); 482 } else if (vp->v_type == VLNK) 483 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 484 else 485 error = EACCES; 486 } else 487 mtx_unlock(&np->n_mtx); 488 return (error); 489 } 490 } 491 492 int nfs_otw_getattr_avoid = 0; 493 494 /* 495 * nfs open vnode op 496 * Check to see if the type is ok 497 * and that deletion is not in progress. 498 * For paged in text files, you will need to flush the page cache 499 * if consistency is lost. 500 */ 501 /* ARGSUSED */ 502 static int 503 nfs_open(struct vop_open_args *ap) 504 { 505 struct vnode *vp = ap->a_vp; 506 struct nfsnode *np = VTONFS(vp); 507 struct vattr vattr; 508 int error; 509 int fmode = ap->a_mode; 510 struct ucred *cred; 511 512 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 513 return (EOPNOTSUPP); 514 515 /* 516 * Get a valid lease. If cached data is stale, flush it. 517 */ 518 mtx_lock(&np->n_mtx); 519 if (np->n_flag & NMODIFIED) { 520 mtx_unlock(&np->n_mtx); 521 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 522 if (error == EINTR || error == EIO) 523 return (error); 524 mtx_lock(&np->n_mtx); 525 np->n_attrstamp = 0; 526 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 527 if (vp->v_type == VDIR) 528 np->n_direofoffset = 0; 529 mtx_unlock(&np->n_mtx); 530 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 531 if (error) 532 return (error); 533 mtx_lock(&np->n_mtx); 534 np->n_mtime = vattr.va_mtime; 535 } else { 536 mtx_unlock(&np->n_mtx); 537 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 538 if (error) 539 return (error); 540 mtx_lock(&np->n_mtx); 541 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 542 if (vp->v_type == VDIR) 543 np->n_direofoffset = 0; 544 mtx_unlock(&np->n_mtx); 545 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 546 if (error == EINTR || error == EIO) { 547 return (error); 548 } 549 mtx_lock(&np->n_mtx); 550 np->n_mtime = vattr.va_mtime; 551 } 552 } 553 /* 554 * If the object has >= 1 O_DIRECT active opens, we disable caching. 555 */ 556 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 557 if (np->n_directio_opens == 0) { 558 mtx_unlock(&np->n_mtx); 559 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 560 if (error) 561 return (error); 562 mtx_lock(&np->n_mtx); 563 np->n_flag |= NNONCACHE; 564 } 565 np->n_directio_opens++; 566 } 567 568 /* 569 * If this is an open for writing, capture a reference to the 570 * credentials, so they can be used by nfs_putpages(). Using 571 * these write credentials is preferable to the credentials of 572 * whatever thread happens to be doing the VOP_PUTPAGES() since 573 * the write RPCs are less likely to fail with EACCES. 574 */ 575 if ((fmode & FWRITE) != 0) { 576 cred = np->n_writecred; 577 np->n_writecred = crhold(ap->a_cred); 578 } else 579 cred = NULL; 580 mtx_unlock(&np->n_mtx); 581 if (cred != NULL) 582 crfree(cred); 583 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 584 return (0); 585 } 586 587 /* 588 * nfs close vnode op 589 * What an NFS client should do upon close after writing is a debatable issue. 590 * Most NFS clients push delayed writes to the server upon close, basically for 591 * two reasons: 592 * 1 - So that any write errors may be reported back to the client process 593 * doing the close system call. By far the two most likely errors are 594 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 595 * 2 - To put a worst case upper bound on cache inconsistency between 596 * multiple clients for the file. 597 * There is also a consistency problem for Version 2 of the protocol w.r.t. 598 * not being able to tell if other clients are writing a file concurrently, 599 * since there is no way of knowing if the changed modify time in the reply 600 * is only due to the write for this client. 601 * (NFS Version 3 provides weak cache consistency data in the reply that 602 * should be sufficient to detect and handle this case.) 603 * 604 * The current code does the following: 605 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 606 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 607 * or commit them (this satisfies 1 and 2 except for the 608 * case where the server crashes after this close but 609 * before the commit RPC, which is felt to be "good 610 * enough". Changing the last argument to nfs_flush() to 611 * a 1 would force a commit operation, if it is felt a 612 * commit is necessary now. 613 */ 614 /* ARGSUSED */ 615 static int 616 nfs_close(struct vop_close_args *ap) 617 { 618 struct vnode *vp = ap->a_vp; 619 struct nfsnode *np = VTONFS(vp); 620 int error = 0; 621 int fmode = ap->a_fflag; 622 623 if (vp->v_type == VREG) { 624 /* 625 * Examine and clean dirty pages, regardless of NMODIFIED. 626 * This closes a major hole in close-to-open consistency. 627 * We want to push out all dirty pages (and buffers) on 628 * close, regardless of whether they were dirtied by 629 * mmap'ed writes or via write(). 630 */ 631 if (nfs_clean_pages_on_close && vp->v_object) { 632 VM_OBJECT_WLOCK(vp->v_object); 633 vm_object_page_clean(vp->v_object, 0, 0, 0); 634 VM_OBJECT_WUNLOCK(vp->v_object); 635 } 636 mtx_lock(&np->n_mtx); 637 if (np->n_flag & NMODIFIED) { 638 mtx_unlock(&np->n_mtx); 639 if (NFS_ISV3(vp)) { 640 /* 641 * Under NFSv3 we have dirty buffers to dispose of. We 642 * must flush them to the NFS server. We have the option 643 * of waiting all the way through the commit rpc or just 644 * waiting for the initial write. The default is to only 645 * wait through the initial write so the data is in the 646 * server's cache, which is roughly similar to the state 647 * a standard disk subsystem leaves the file in on close(). 648 * 649 * We cannot clear the NMODIFIED bit in np->n_flag due to 650 * potential races with other processes, and certainly 651 * cannot clear it if we don't commit. 652 */ 653 int cm = nfsv3_commit_on_close ? 1 : 0; 654 error = nfs_flush(vp, MNT_WAIT, cm); 655 /* np->n_flag &= ~NMODIFIED; */ 656 } else 657 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 658 mtx_lock(&np->n_mtx); 659 } 660 if (np->n_flag & NWRITEERR) { 661 np->n_flag &= ~NWRITEERR; 662 error = np->n_error; 663 } 664 mtx_unlock(&np->n_mtx); 665 } 666 if (nfs_directio_enable) 667 KASSERT((np->n_directio_asyncwr == 0), 668 ("nfs_close: dirty unflushed (%d) directio buffers\n", 669 np->n_directio_asyncwr)); 670 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 671 mtx_lock(&np->n_mtx); 672 KASSERT((np->n_directio_opens > 0), 673 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 674 np->n_directio_opens--; 675 if (np->n_directio_opens == 0) 676 np->n_flag &= ~NNONCACHE; 677 mtx_unlock(&np->n_mtx); 678 } 679 return (error); 680 } 681 682 /* 683 * nfs getattr call from vfs. 684 */ 685 static int 686 nfs_getattr(struct vop_getattr_args *ap) 687 { 688 struct vnode *vp = ap->a_vp; 689 struct nfsnode *np = VTONFS(vp); 690 struct thread *td = curthread; 691 struct vattr *vap = ap->a_vap; 692 struct vattr vattr; 693 caddr_t bpos, dpos; 694 int error = 0; 695 struct mbuf *mreq, *mrep, *md, *mb; 696 int v3 = NFS_ISV3(vp); 697 698 /* 699 * Update local times for special files. 700 */ 701 mtx_lock(&np->n_mtx); 702 if (np->n_flag & (NACC | NUPD)) 703 np->n_flag |= NCHG; 704 mtx_unlock(&np->n_mtx); 705 /* 706 * First look in the cache. 707 */ 708 if (nfs_getattrcache(vp, &vattr) == 0) 709 goto nfsmout; 710 if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) { 711 nfsstats.accesscache_misses++; 712 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL); 713 if (nfs_getattrcache(vp, &vattr) == 0) 714 goto nfsmout; 715 } 716 nfsstats.rpccnt[NFSPROC_GETATTR]++; 717 mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0); 718 mb = mreq; 719 bpos = mtod(mb, caddr_t); 720 nfsm_fhtom(vp, v3); 721 nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred); 722 if (!error) { 723 nfsm_loadattr(vp, &vattr); 724 } 725 m_freem(mrep); 726 nfsmout: 727 vap->va_type = vattr.va_type; 728 vap->va_mode = vattr.va_mode; 729 vap->va_nlink = vattr.va_nlink; 730 vap->va_uid = vattr.va_uid; 731 vap->va_gid = vattr.va_gid; 732 vap->va_fsid = vattr.va_fsid; 733 vap->va_fileid = vattr.va_fileid; 734 vap->va_size = vattr.va_size; 735 vap->va_blocksize = vattr.va_blocksize; 736 vap->va_atime = vattr.va_atime; 737 vap->va_mtime = vattr.va_mtime; 738 vap->va_ctime = vattr.va_ctime; 739 vap->va_gen = vattr.va_gen; 740 vap->va_flags = vattr.va_flags; 741 vap->va_rdev = vattr.va_rdev; 742 vap->va_bytes = vattr.va_bytes; 743 vap->va_filerev = vattr.va_filerev; 744 745 return (error); 746 } 747 748 /* 749 * nfs setattr call. 750 */ 751 static int 752 nfs_setattr(struct vop_setattr_args *ap) 753 { 754 struct vnode *vp = ap->a_vp; 755 struct nfsnode *np = VTONFS(vp); 756 struct vattr *vap = ap->a_vap; 757 struct thread *td = curthread; 758 int error = 0; 759 u_quad_t tsize; 760 761 #ifndef nolint 762 tsize = (u_quad_t)0; 763 #endif 764 765 /* 766 * Setting of flags is not supported. 767 */ 768 if (vap->va_flags != VNOVAL) 769 return (EOPNOTSUPP); 770 771 /* 772 * Disallow write attempts if the filesystem is mounted read-only. 773 */ 774 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 775 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 776 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 777 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 778 error = EROFS; 779 goto out; 780 } 781 if (vap->va_size != VNOVAL) { 782 switch (vp->v_type) { 783 case VDIR: 784 return (EISDIR); 785 case VCHR: 786 case VBLK: 787 case VSOCK: 788 case VFIFO: 789 if (vap->va_mtime.tv_sec == VNOVAL && 790 vap->va_atime.tv_sec == VNOVAL && 791 vap->va_mode == (mode_t)VNOVAL && 792 vap->va_uid == (uid_t)VNOVAL && 793 vap->va_gid == (gid_t)VNOVAL) 794 return (0); 795 vap->va_size = VNOVAL; 796 break; 797 default: 798 /* 799 * Disallow write attempts if the filesystem is 800 * mounted read-only. 801 */ 802 if (vp->v_mount->mnt_flag & MNT_RDONLY) 803 return (EROFS); 804 /* 805 * We run vnode_pager_setsize() early (why?), 806 * we must set np->n_size now to avoid vinvalbuf 807 * V_SAVE races that might setsize a lower 808 * value. 809 */ 810 mtx_lock(&np->n_mtx); 811 tsize = np->n_size; 812 mtx_unlock(&np->n_mtx); 813 error = nfs_meta_setsize(vp, ap->a_cred, td, 814 vap->va_size); 815 mtx_lock(&np->n_mtx); 816 if (np->n_flag & NMODIFIED) { 817 tsize = np->n_size; 818 mtx_unlock(&np->n_mtx); 819 if (vap->va_size == 0) 820 error = nfs_vinvalbuf(vp, 0, td, 1); 821 else 822 error = nfs_vinvalbuf(vp, V_SAVE, td, 1); 823 if (error) { 824 vnode_pager_setsize(vp, tsize); 825 goto out; 826 } 827 } else 828 mtx_unlock(&np->n_mtx); 829 /* 830 * np->n_size has already been set to vap->va_size 831 * in nfs_meta_setsize(). We must set it again since 832 * nfs_loadattrcache() could be called through 833 * nfs_meta_setsize() and could modify np->n_size. 834 */ 835 mtx_lock(&np->n_mtx); 836 np->n_vattr.va_size = np->n_size = vap->va_size; 837 mtx_unlock(&np->n_mtx); 838 }; 839 } else { 840 mtx_lock(&np->n_mtx); 841 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 842 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 843 mtx_unlock(&np->n_mtx); 844 if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 && 845 (error == EINTR || error == EIO)) 846 return error; 847 } else 848 mtx_unlock(&np->n_mtx); 849 } 850 error = nfs_setattrrpc(vp, vap, ap->a_cred); 851 if (error && vap->va_size != VNOVAL) { 852 mtx_lock(&np->n_mtx); 853 np->n_size = np->n_vattr.va_size = tsize; 854 vnode_pager_setsize(vp, tsize); 855 mtx_unlock(&np->n_mtx); 856 } 857 out: 858 return (error); 859 } 860 861 /* 862 * Do an nfs setattr rpc. 863 */ 864 static int 865 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred) 866 { 867 struct nfsv2_sattr *sp; 868 struct nfsnode *np = VTONFS(vp); 869 caddr_t bpos, dpos; 870 u_int32_t *tl; 871 int error = 0, i, wccflag = NFSV3_WCCRATTR; 872 struct mbuf *mreq, *mrep, *md, *mb; 873 int v3 = NFS_ISV3(vp); 874 875 nfsstats.rpccnt[NFSPROC_SETATTR]++; 876 mreq = m_get2(NFSX_FH(v3) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 877 mb = mreq; 878 bpos = mtod(mb, caddr_t); 879 nfsm_fhtom(vp, v3); 880 if (v3) { 881 nfsm_v3attrbuild(vap, TRUE); 882 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 883 *tl = nfs_false; 884 } else { 885 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 886 if (vap->va_mode == (mode_t)VNOVAL) 887 sp->sa_mode = nfs_xdrneg1; 888 else 889 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 890 if (vap->va_uid == (uid_t)VNOVAL) 891 sp->sa_uid = nfs_xdrneg1; 892 else 893 sp->sa_uid = txdr_unsigned(vap->va_uid); 894 if (vap->va_gid == (gid_t)VNOVAL) 895 sp->sa_gid = nfs_xdrneg1; 896 else 897 sp->sa_gid = txdr_unsigned(vap->va_gid); 898 sp->sa_size = txdr_unsigned(vap->va_size); 899 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 900 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 901 } 902 nfsm_request(vp, NFSPROC_SETATTR, curthread, cred); 903 if (v3) { 904 mtx_lock(&np->n_mtx); 905 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 906 np->n_accesscache[i].stamp = 0; 907 mtx_unlock(&np->n_mtx); 908 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 909 nfsm_wcc_data(vp, wccflag); 910 } else 911 nfsm_loadattr(vp, NULL); 912 m_freem(mrep); 913 nfsmout: 914 return (error); 915 } 916 917 /* 918 * nfs lookup call, one step at a time... 919 * First look in cache 920 * If not found, unlock the directory nfsnode and do the rpc 921 */ 922 static int 923 nfs_lookup(struct vop_lookup_args *ap) 924 { 925 struct componentname *cnp = ap->a_cnp; 926 struct vnode *dvp = ap->a_dvp; 927 struct vnode **vpp = ap->a_vpp; 928 struct mount *mp = dvp->v_mount; 929 struct vattr dvattr, vattr; 930 struct timespec nctime; 931 int flags = cnp->cn_flags; 932 struct vnode *newvp; 933 struct nfsmount *nmp; 934 caddr_t bpos, dpos; 935 struct mbuf *mreq, *mrep, *md, *mb; 936 long len; 937 nfsfh_t *fhp; 938 struct nfsnode *np, *newnp; 939 int error = 0, attrflag, dattrflag, fhsize, ltype, ncticks; 940 int v3 = NFS_ISV3(dvp); 941 struct thread *td = cnp->cn_thread; 942 943 *vpp = NULLVP; 944 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 945 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 946 return (EROFS); 947 if (dvp->v_type != VDIR) 948 return (ENOTDIR); 949 nmp = VFSTONFS(mp); 950 np = VTONFS(dvp); 951 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 952 *vpp = NULLVP; 953 return (error); 954 } 955 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 956 if (error > 0 && error != ENOENT) 957 return (error); 958 if (error == -1) { 959 /* 960 * Lookups of "." are special and always return the 961 * current directory. cache_lookup() already handles 962 * associated locking bookkeeping, etc. 963 */ 964 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 965 /* XXX: Is this really correct? */ 966 if (cnp->cn_nameiop != LOOKUP && 967 (flags & ISLASTCN)) 968 cnp->cn_flags |= SAVENAME; 969 return (0); 970 } 971 972 /* 973 * We only accept a positive hit in the cache if the 974 * change time of the file matches our cached copy. 975 * Otherwise, we discard the cache entry and fallback 976 * to doing a lookup RPC. We also only trust cache 977 * entries for less than nm_nametimeo seconds. 978 * 979 * To better handle stale file handles and attributes, 980 * clear the attribute cache of this node if it is a 981 * leaf component, part of an open() call, and not 982 * locally modified before fetching the attributes. 983 * This should allow stale file handles to be detected 984 * here where we can fall back to a LOOKUP RPC to 985 * recover rather than having nfs_open() detect the 986 * stale file handle and failing open(2) with ESTALE. 987 */ 988 newvp = *vpp; 989 newnp = VTONFS(newvp); 990 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 991 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 992 !(newnp->n_flag & NMODIFIED)) { 993 mtx_lock(&newnp->n_mtx); 994 newnp->n_attrstamp = 0; 995 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 996 mtx_unlock(&newnp->n_mtx); 997 } 998 if ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 999 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1000 timespeccmp(&vattr.va_ctime, &nctime, ==)) { 1001 nfsstats.lookupcache_hits++; 1002 if (cnp->cn_nameiop != LOOKUP && 1003 (flags & ISLASTCN)) 1004 cnp->cn_flags |= SAVENAME; 1005 return (0); 1006 } 1007 cache_purge(newvp); 1008 if (dvp != newvp) 1009 vput(newvp); 1010 else 1011 vrele(newvp); 1012 *vpp = NULLVP; 1013 } else if (error == ENOENT) { 1014 if (dvp->v_iflag & VI_DOOMED) 1015 return (ENOENT); 1016 /* 1017 * We only accept a negative hit in the cache if the 1018 * modification time of the parent directory matches 1019 * the cached copy in the name cache entry. 1020 * Otherwise, we discard all of the negative cache 1021 * entries for this directory. We also only trust 1022 * negative cache entries for up to nm_negnametimeo 1023 * seconds. 1024 */ 1025 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1026 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1027 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1028 nfsstats.lookupcache_hits++; 1029 return (ENOENT); 1030 } 1031 cache_purge_negative(dvp); 1032 } 1033 1034 attrflag = dattrflag = 0; 1035 error = 0; 1036 newvp = NULLVP; 1037 nfsstats.lookupcache_misses++; 1038 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1039 len = cnp->cn_namelen; 1040 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len), M_WAITOK, 1041 MT_DATA, 0); 1042 mb = mreq; 1043 bpos = mtod(mb, caddr_t); 1044 nfsm_fhtom(dvp, v3); 1045 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1046 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 1047 if (error) { 1048 if (v3) { 1049 nfsm_postop_attr_va(dvp, dattrflag, &vattr); 1050 m_freem(mrep); 1051 } 1052 goto nfsmout; 1053 } 1054 nfsm_getfh(fhp, fhsize, v3); 1055 1056 /* 1057 * Handle RENAME case... 1058 */ 1059 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1060 if (NFS_CMPFH(np, fhp, fhsize)) { 1061 m_freem(mrep); 1062 return (EISDIR); 1063 } 1064 error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE); 1065 if (error) { 1066 m_freem(mrep); 1067 return (error); 1068 } 1069 newvp = NFSTOV(np); 1070 if (v3) { 1071 nfsm_postop_attr(newvp, attrflag); 1072 nfsm_postop_attr(dvp, attrflag); 1073 } else 1074 nfsm_loadattr(newvp, NULL); 1075 *vpp = newvp; 1076 m_freem(mrep); 1077 cnp->cn_flags |= SAVENAME; 1078 return (0); 1079 } 1080 1081 if (flags & ISDOTDOT) { 1082 ltype = VOP_ISLOCKED(dvp); 1083 error = vfs_busy(mp, MBF_NOWAIT); 1084 if (error != 0) { 1085 vfs_ref(mp); 1086 VOP_UNLOCK(dvp, 0); 1087 error = vfs_busy(mp, 0); 1088 vn_lock(dvp, ltype | LK_RETRY); 1089 vfs_rel(mp); 1090 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { 1091 vfs_unbusy(mp); 1092 error = ENOENT; 1093 } 1094 if (error != 0) { 1095 m_freem(mrep); 1096 return (error); 1097 } 1098 } 1099 VOP_UNLOCK(dvp, 0); 1100 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1101 if (error == 0) 1102 newvp = NFSTOV(np); 1103 vfs_unbusy(mp); 1104 if (newvp != dvp) 1105 vn_lock(dvp, ltype | LK_RETRY); 1106 if (dvp->v_iflag & VI_DOOMED) { 1107 if (error == 0) { 1108 if (newvp == dvp) 1109 vrele(newvp); 1110 else 1111 vput(newvp); 1112 } 1113 error = ENOENT; 1114 } 1115 if (error) { 1116 m_freem(mrep); 1117 return (error); 1118 } 1119 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1120 VREF(dvp); 1121 newvp = dvp; 1122 } else { 1123 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1124 if (error) { 1125 m_freem(mrep); 1126 return (error); 1127 } 1128 newvp = NFSTOV(np); 1129 1130 /* 1131 * Flush the attribute cache when opening a leaf node 1132 * to ensure that fresh attributes are fetched in 1133 * nfs_open() if we are unable to fetch attributes 1134 * from the LOOKUP reply. 1135 */ 1136 if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1137 !(np->n_flag & NMODIFIED)) { 1138 mtx_lock(&np->n_mtx); 1139 np->n_attrstamp = 0; 1140 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1141 mtx_unlock(&np->n_mtx); 1142 } 1143 } 1144 if (v3) { 1145 nfsm_postop_attr_va(newvp, attrflag, &vattr); 1146 nfsm_postop_attr_va(dvp, dattrflag, &dvattr); 1147 } else { 1148 nfsm_loadattr(newvp, &vattr); 1149 attrflag = 1; 1150 } 1151 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1152 cnp->cn_flags |= SAVENAME; 1153 if ((cnp->cn_flags & MAKEENTRY) && 1154 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1155 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1156 cache_enter_time(dvp, newvp, cnp, &vattr.va_ctime, 1157 newvp->v_type != VDIR ? NULL : &dvattr.va_ctime); 1158 *vpp = newvp; 1159 m_freem(mrep); 1160 nfsmout: 1161 if (error) { 1162 if (newvp != NULLVP) { 1163 vput(newvp); 1164 *vpp = NULLVP; 1165 } 1166 1167 if (error != ENOENT) 1168 goto done; 1169 1170 /* The requested file was not found. */ 1171 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1172 (flags & ISLASTCN)) { 1173 /* 1174 * XXX: UFS does a full VOP_ACCESS(dvp, 1175 * VWRITE) here instead of just checking 1176 * MNT_RDONLY. 1177 */ 1178 if (mp->mnt_flag & MNT_RDONLY) 1179 return (EROFS); 1180 cnp->cn_flags |= SAVENAME; 1181 return (EJUSTRETURN); 1182 } 1183 1184 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 1185 dattrflag) { 1186 /* 1187 * Cache the modification time of the parent 1188 * directory from the post-op attributes in 1189 * the name cache entry. The negative cache 1190 * entry will be ignored once the directory 1191 * has changed. Don't bother adding the entry 1192 * if the directory has already changed. 1193 */ 1194 mtx_lock(&np->n_mtx); 1195 if (timespeccmp(&np->n_vattr.va_mtime, 1196 &vattr.va_mtime, ==)) { 1197 mtx_unlock(&np->n_mtx); 1198 cache_enter_time(dvp, NULL, cnp, 1199 &vattr.va_mtime, NULL); 1200 } else 1201 mtx_unlock(&np->n_mtx); 1202 } 1203 return (ENOENT); 1204 } 1205 done: 1206 return (error); 1207 } 1208 1209 /* 1210 * nfs read call. 1211 * Just call nfs_bioread() to do the work. 1212 */ 1213 static int 1214 nfs_read(struct vop_read_args *ap) 1215 { 1216 struct vnode *vp = ap->a_vp; 1217 1218 switch (vp->v_type) { 1219 case VREG: 1220 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1221 case VDIR: 1222 return (EISDIR); 1223 default: 1224 return (EOPNOTSUPP); 1225 } 1226 } 1227 1228 /* 1229 * nfs readlink call 1230 */ 1231 static int 1232 nfs_readlink(struct vop_readlink_args *ap) 1233 { 1234 struct vnode *vp = ap->a_vp; 1235 1236 if (vp->v_type != VLNK) 1237 return (EINVAL); 1238 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1239 } 1240 1241 /* 1242 * Do a readlink rpc. 1243 * Called by nfs_doio() from below the buffer cache. 1244 */ 1245 int 1246 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1247 { 1248 caddr_t bpos, dpos; 1249 int error = 0, len, attrflag; 1250 struct mbuf *mreq, *mrep, *md, *mb; 1251 int v3 = NFS_ISV3(vp); 1252 1253 nfsstats.rpccnt[NFSPROC_READLINK]++; 1254 mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0); 1255 mb = mreq; 1256 bpos = mtod(mb, caddr_t); 1257 nfsm_fhtom(vp, v3); 1258 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1259 if (v3) 1260 nfsm_postop_attr(vp, attrflag); 1261 if (!error) { 1262 nfsm_strsiz(len, NFS_MAXPATHLEN); 1263 if (len == NFS_MAXPATHLEN) { 1264 struct nfsnode *np = VTONFS(vp); 1265 mtx_lock(&np->n_mtx); 1266 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1267 len = np->n_size; 1268 mtx_unlock(&np->n_mtx); 1269 } 1270 nfsm_mtouio(uiop, len); 1271 } 1272 m_freem(mrep); 1273 nfsmout: 1274 return (error); 1275 } 1276 1277 /* 1278 * nfs read rpc call 1279 * Ditto above 1280 */ 1281 int 1282 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1283 { 1284 u_int32_t *tl; 1285 caddr_t bpos, dpos; 1286 struct mbuf *mreq, *mrep, *md, *mb; 1287 struct nfsmount *nmp; 1288 off_t end; 1289 int error = 0, len, retlen, tsiz, eof, attrflag; 1290 int v3 = NFS_ISV3(vp); 1291 int rsize; 1292 1293 #ifndef nolint 1294 eof = 0; 1295 #endif 1296 nmp = VFSTONFS(vp->v_mount); 1297 tsiz = uiop->uio_resid; 1298 mtx_lock(&nmp->nm_mtx); 1299 end = uiop->uio_offset + tsiz; 1300 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { 1301 mtx_unlock(&nmp->nm_mtx); 1302 return (EFBIG); 1303 } 1304 rsize = nmp->nm_rsize; 1305 mtx_unlock(&nmp->nm_mtx); 1306 while (tsiz > 0) { 1307 nfsstats.rpccnt[NFSPROC_READ]++; 1308 len = (tsiz > rsize) ? rsize : tsiz; 1309 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED * 3, M_WAITOK, 1310 MT_DATA, 0); 1311 mb = mreq; 1312 bpos = mtod(mb, caddr_t); 1313 nfsm_fhtom(vp, v3); 1314 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1315 if (v3) { 1316 txdr_hyper(uiop->uio_offset, tl); 1317 *(tl + 2) = txdr_unsigned(len); 1318 } else { 1319 *tl++ = txdr_unsigned(uiop->uio_offset); 1320 *tl++ = txdr_unsigned(len); 1321 *tl = 0; 1322 } 1323 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1324 if (v3) { 1325 nfsm_postop_attr(vp, attrflag); 1326 if (error) { 1327 m_freem(mrep); 1328 goto nfsmout; 1329 } 1330 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1331 eof = fxdr_unsigned(int, *(tl + 1)); 1332 } else { 1333 nfsm_loadattr(vp, NULL); 1334 } 1335 nfsm_strsiz(retlen, rsize); 1336 nfsm_mtouio(uiop, retlen); 1337 m_freem(mrep); 1338 tsiz -= retlen; 1339 if (v3) { 1340 if (eof || retlen == 0) { 1341 tsiz = 0; 1342 } 1343 } else if (retlen < len) { 1344 tsiz = 0; 1345 } 1346 } 1347 nfsmout: 1348 return (error); 1349 } 1350 1351 /* 1352 * nfs write call 1353 */ 1354 int 1355 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1356 int *iomode, int *must_commit) 1357 { 1358 u_int32_t *tl; 1359 int32_t backup; 1360 caddr_t bpos, dpos; 1361 struct mbuf *mreq, *mrep, *md, *mb; 1362 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1363 off_t end; 1364 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1365 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1366 int wsize; 1367 1368 KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1")); 1369 *must_commit = 0; 1370 tsiz = uiop->uio_resid; 1371 mtx_lock(&nmp->nm_mtx); 1372 end = uiop->uio_offset + tsiz; 1373 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { 1374 mtx_unlock(&nmp->nm_mtx); 1375 return (EFBIG); 1376 } 1377 wsize = nmp->nm_wsize; 1378 mtx_unlock(&nmp->nm_mtx); 1379 while (tsiz > 0) { 1380 nfsstats.rpccnt[NFSPROC_WRITE]++; 1381 len = (tsiz > wsize) ? wsize : tsiz; 1382 mreq = m_get2(NFSX_FH(v3) + 5 * NFSX_UNSIGNED, M_WAITOK, 1383 MT_DATA, 0); 1384 mb = mreq; 1385 bpos = mtod(mb, caddr_t); 1386 nfsm_fhtom(vp, v3); 1387 if (v3) { 1388 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1389 txdr_hyper(uiop->uio_offset, tl); 1390 tl += 2; 1391 *tl++ = txdr_unsigned(len); 1392 *tl++ = txdr_unsigned(*iomode); 1393 *tl = txdr_unsigned(len); 1394 } else { 1395 u_int32_t x; 1396 1397 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1398 /* Set both "begin" and "current" to non-garbage. */ 1399 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1400 *tl++ = x; /* "begin offset" */ 1401 *tl++ = x; /* "current offset" */ 1402 x = txdr_unsigned(len); 1403 *tl++ = x; /* total to this offset */ 1404 *tl = x; /* size of this write */ 1405 } 1406 nfsm_uiotom(uiop, len); 1407 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1408 if (v3) { 1409 wccflag = NFSV3_WCCCHK; 1410 nfsm_wcc_data(vp, wccflag); 1411 if (!error) { 1412 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1413 + NFSX_V3WRITEVERF); 1414 rlen = fxdr_unsigned(int, *tl++); 1415 if (rlen == 0) { 1416 error = NFSERR_IO; 1417 m_freem(mrep); 1418 break; 1419 } else if (rlen < len) { 1420 backup = len - rlen; 1421 uiop->uio_iov->iov_base = 1422 (char *)uiop->uio_iov->iov_base - 1423 backup; 1424 uiop->uio_iov->iov_len += backup; 1425 uiop->uio_offset -= backup; 1426 uiop->uio_resid += backup; 1427 len = rlen; 1428 } 1429 commit = fxdr_unsigned(int, *tl++); 1430 1431 /* 1432 * Return the lowest committment level 1433 * obtained by any of the RPCs. 1434 */ 1435 if (committed == NFSV3WRITE_FILESYNC) 1436 committed = commit; 1437 else if (committed == NFSV3WRITE_DATASYNC && 1438 commit == NFSV3WRITE_UNSTABLE) 1439 committed = commit; 1440 mtx_lock(&nmp->nm_mtx); 1441 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1442 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1443 NFSX_V3WRITEVERF); 1444 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1445 } else if (bcmp((caddr_t)tl, 1446 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1447 *must_commit = 1; 1448 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1449 NFSX_V3WRITEVERF); 1450 } 1451 mtx_unlock(&nmp->nm_mtx); 1452 } 1453 } else { 1454 nfsm_loadattr(vp, NULL); 1455 } 1456 if (wccflag) { 1457 mtx_lock(&(VTONFS(vp))->n_mtx); 1458 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1459 mtx_unlock(&(VTONFS(vp))->n_mtx); 1460 } 1461 m_freem(mrep); 1462 if (error) 1463 break; 1464 tsiz -= len; 1465 } 1466 nfsmout: 1467 if (DOINGASYNC(vp)) 1468 committed = NFSV3WRITE_FILESYNC; 1469 *iomode = committed; 1470 if (error) 1471 uiop->uio_resid = tsiz; 1472 return (error); 1473 } 1474 1475 /* 1476 * nfs mknod rpc 1477 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1478 * mode set to specify the file type and the size field for rdev. 1479 */ 1480 static int 1481 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1482 struct vattr *vap) 1483 { 1484 struct nfsv2_sattr *sp; 1485 u_int32_t *tl; 1486 struct vnode *newvp = NULL; 1487 struct nfsnode *np = NULL; 1488 struct vattr vattr; 1489 caddr_t bpos, dpos; 1490 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1491 struct mbuf *mreq, *mrep, *md, *mb; 1492 u_int32_t rdev; 1493 int v3 = NFS_ISV3(dvp); 1494 1495 if (vap->va_type == VCHR || vap->va_type == VBLK) 1496 rdev = txdr_unsigned(vap->va_rdev); 1497 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1498 rdev = nfs_xdrneg1; 1499 else { 1500 return (EOPNOTSUPP); 1501 } 1502 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 1503 return (error); 1504 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1505 mreq = m_get2(NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1506 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 1507 mb = mreq; 1508 bpos = mtod(mb, caddr_t); 1509 nfsm_fhtom(dvp, v3); 1510 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1511 if (v3) { 1512 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1513 *tl++ = vtonfsv3_type(vap->va_type); 1514 nfsm_v3attrbuild(vap, FALSE); 1515 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1516 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1517 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1518 *tl = txdr_unsigned(minor(vap->va_rdev)); 1519 } 1520 } else { 1521 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1522 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1523 sp->sa_uid = nfs_xdrneg1; 1524 sp->sa_gid = nfs_xdrneg1; 1525 sp->sa_size = rdev; 1526 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1527 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1528 } 1529 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1530 if (!error) { 1531 nfsm_mtofh(dvp, newvp, v3, gotvp); 1532 if (!gotvp) { 1533 if (newvp) { 1534 vput(newvp); 1535 newvp = NULL; 1536 } 1537 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1538 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1539 if (!error) 1540 newvp = NFSTOV(np); 1541 } 1542 } 1543 if (v3) 1544 nfsm_wcc_data(dvp, wccflag); 1545 m_freem(mrep); 1546 nfsmout: 1547 if (error) { 1548 if (newvp) 1549 vput(newvp); 1550 } else { 1551 *vpp = newvp; 1552 } 1553 mtx_lock(&(VTONFS(dvp))->n_mtx); 1554 VTONFS(dvp)->n_flag |= NMODIFIED; 1555 if (!wccflag) { 1556 VTONFS(dvp)->n_attrstamp = 0; 1557 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1558 } 1559 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1560 return (error); 1561 } 1562 1563 /* 1564 * nfs mknod vop 1565 * just call nfs_mknodrpc() to do the work. 1566 */ 1567 /* ARGSUSED */ 1568 static int 1569 nfs_mknod(struct vop_mknod_args *ap) 1570 { 1571 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1572 } 1573 1574 static u_long create_verf; 1575 /* 1576 * nfs file create call 1577 */ 1578 static int 1579 nfs_create(struct vop_create_args *ap) 1580 { 1581 struct vnode *dvp = ap->a_dvp; 1582 struct vattr *vap = ap->a_vap; 1583 struct componentname *cnp = ap->a_cnp; 1584 struct nfsv2_sattr *sp; 1585 u_int32_t *tl; 1586 struct nfsnode *np = NULL; 1587 struct vnode *newvp = NULL; 1588 caddr_t bpos, dpos; 1589 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1590 struct mbuf *mreq, *mrep, *md, *mb; 1591 struct vattr vattr; 1592 int v3 = NFS_ISV3(dvp); 1593 1594 /* 1595 * Oops, not for me.. 1596 */ 1597 if (vap->va_type == VSOCK) { 1598 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); 1599 return (error); 1600 } 1601 1602 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) { 1603 return (error); 1604 } 1605 if (vap->va_vaflags & VA_EXCLUSIVE) 1606 fmode |= O_EXCL; 1607 again: 1608 nfsstats.rpccnt[NFSPROC_CREATE]++; 1609 mreq = m_get2(NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1610 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 1611 mb = mreq; 1612 bpos = mtod(mb, caddr_t); 1613 nfsm_fhtom(dvp, v3); 1614 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1615 if (v3) { 1616 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1617 if (fmode & O_EXCL) { 1618 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1619 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1620 #ifdef INET 1621 CURVNET_SET(CRED_TO_VNET(cnp->cn_cred)); 1622 IN_IFADDR_RLOCK(); 1623 if (!TAILQ_EMPTY(&V_in_ifaddrhead)) 1624 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr; 1625 else 1626 #endif 1627 *tl++ = create_verf; 1628 #ifdef INET 1629 IN_IFADDR_RUNLOCK(); 1630 CURVNET_RESTORE(); 1631 #endif 1632 *tl = ++create_verf; 1633 } else { 1634 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1635 nfsm_v3attrbuild(vap, FALSE); 1636 } 1637 } else { 1638 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1639 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1640 sp->sa_uid = nfs_xdrneg1; 1641 sp->sa_gid = nfs_xdrneg1; 1642 sp->sa_size = 0; 1643 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1644 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1645 } 1646 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1647 if (!error) { 1648 nfsm_mtofh(dvp, newvp, v3, gotvp); 1649 if (!gotvp) { 1650 if (newvp) { 1651 vput(newvp); 1652 newvp = NULL; 1653 } 1654 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1655 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1656 if (!error) 1657 newvp = NFSTOV(np); 1658 } 1659 } 1660 if (v3) 1661 nfsm_wcc_data(dvp, wccflag); 1662 m_freem(mrep); 1663 nfsmout: 1664 if (error) { 1665 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1666 fmode &= ~O_EXCL; 1667 goto again; 1668 } 1669 if (newvp) 1670 vput(newvp); 1671 } else if (v3 && (fmode & O_EXCL)) { 1672 /* 1673 * We are normally called with only a partially initialized 1674 * VAP. Since the NFSv3 spec says that server may use the 1675 * file attributes to store the verifier, the spec requires 1676 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1677 * in atime, but we can't really assume that all servers will 1678 * so we ensure that our SETATTR sets both atime and mtime. 1679 */ 1680 if (vap->va_mtime.tv_sec == VNOVAL) 1681 vfs_timestamp(&vap->va_mtime); 1682 if (vap->va_atime.tv_sec == VNOVAL) 1683 vap->va_atime = vap->va_mtime; 1684 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred); 1685 if (error) 1686 vput(newvp); 1687 } 1688 if (!error) { 1689 *ap->a_vpp = newvp; 1690 } 1691 mtx_lock(&(VTONFS(dvp))->n_mtx); 1692 VTONFS(dvp)->n_flag |= NMODIFIED; 1693 if (!wccflag) { 1694 VTONFS(dvp)->n_attrstamp = 0; 1695 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1696 } 1697 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1698 return (error); 1699 } 1700 1701 /* 1702 * nfs file remove call 1703 * To try and make nfs semantics closer to ufs semantics, a file that has 1704 * other processes using the vnode is renamed instead of removed and then 1705 * removed later on the last close. 1706 * - If v_usecount > 1 1707 * If a rename is not already in the works 1708 * call nfs_sillyrename() to set it up 1709 * else 1710 * do the remove rpc 1711 */ 1712 static int 1713 nfs_remove(struct vop_remove_args *ap) 1714 { 1715 struct vnode *vp = ap->a_vp; 1716 struct vnode *dvp = ap->a_dvp; 1717 struct componentname *cnp = ap->a_cnp; 1718 struct nfsnode *np = VTONFS(vp); 1719 int error = 0; 1720 struct vattr vattr; 1721 1722 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1723 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1724 if (vp->v_type == VDIR) 1725 error = EPERM; 1726 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1727 !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) { 1728 /* 1729 * Purge the name cache so that the chance of a lookup for 1730 * the name succeeding while the remove is in progress is 1731 * minimized. Without node locking it can still happen, such 1732 * that an I/O op returns ESTALE, but since you get this if 1733 * another host removes the file.. 1734 */ 1735 cache_purge(vp); 1736 /* 1737 * throw away biocache buffers, mainly to avoid 1738 * unnecessary delayed writes later. 1739 */ 1740 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1741 /* Do the rpc */ 1742 if (error != EINTR && error != EIO) 1743 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1744 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1745 /* 1746 * Kludge City: If the first reply to the remove rpc is lost.. 1747 * the reply to the retransmitted request will be ENOENT 1748 * since the file was in fact removed 1749 * Therefore, we cheat and return success. 1750 */ 1751 if (error == ENOENT) 1752 error = 0; 1753 } else if (!np->n_sillyrename) 1754 error = nfs_sillyrename(dvp, vp, cnp); 1755 mtx_lock(&np->n_mtx); 1756 np->n_attrstamp = 0; 1757 mtx_unlock(&np->n_mtx); 1758 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1759 return (error); 1760 } 1761 1762 /* 1763 * nfs file remove rpc called from nfs_inactive 1764 */ 1765 int 1766 nfs_removeit(struct sillyrename *sp) 1767 { 1768 /* 1769 * Make sure that the directory vnode is still valid. 1770 * XXX we should lock sp->s_dvp here. 1771 */ 1772 if (sp->s_dvp->v_type == VBAD) 1773 return (0); 1774 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1775 NULL)); 1776 } 1777 1778 /* 1779 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1780 */ 1781 static int 1782 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1783 struct ucred *cred, struct thread *td) 1784 { 1785 caddr_t bpos, dpos; 1786 int error = 0, wccflag = NFSV3_WCCRATTR; 1787 struct mbuf *mreq, *mrep, *md, *mb; 1788 int v3 = NFS_ISV3(dvp); 1789 1790 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1791 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen), 1792 M_WAITOK, MT_DATA, 0); 1793 mb = mreq; 1794 bpos = mtod(mb, caddr_t); 1795 nfsm_fhtom(dvp, v3); 1796 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1797 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1798 if (v3) 1799 nfsm_wcc_data(dvp, wccflag); 1800 m_freem(mrep); 1801 nfsmout: 1802 mtx_lock(&(VTONFS(dvp))->n_mtx); 1803 VTONFS(dvp)->n_flag |= NMODIFIED; 1804 if (!wccflag) { 1805 VTONFS(dvp)->n_attrstamp = 0; 1806 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1807 } 1808 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1809 return (error); 1810 } 1811 1812 /* 1813 * nfs file rename call 1814 */ 1815 static int 1816 nfs_rename(struct vop_rename_args *ap) 1817 { 1818 struct vnode *fvp = ap->a_fvp; 1819 struct vnode *tvp = ap->a_tvp; 1820 struct vnode *fdvp = ap->a_fdvp; 1821 struct vnode *tdvp = ap->a_tdvp; 1822 struct componentname *tcnp = ap->a_tcnp; 1823 struct componentname *fcnp = ap->a_fcnp; 1824 int error; 1825 1826 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1827 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1828 /* Check for cross-device rename */ 1829 if ((fvp->v_mount != tdvp->v_mount) || 1830 (tvp && (fvp->v_mount != tvp->v_mount))) { 1831 error = EXDEV; 1832 goto out; 1833 } 1834 1835 if (fvp == tvp) { 1836 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1837 error = 0; 1838 goto out; 1839 } 1840 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 1841 goto out; 1842 1843 /* 1844 * We have to flush B_DELWRI data prior to renaming 1845 * the file. If we don't, the delayed-write buffers 1846 * can be flushed out later after the file has gone stale 1847 * under NFSV3. NFSV2 does not have this problem because 1848 * ( as far as I can tell ) it flushes dirty buffers more 1849 * often. 1850 * 1851 * Skip the rename operation if the fsync fails, this can happen 1852 * due to the server's volume being full, when we pushed out data 1853 * that was written back to our cache earlier. Not checking for 1854 * this condition can result in potential (silent) data loss. 1855 */ 1856 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1857 VOP_UNLOCK(fvp, 0); 1858 if (!error && tvp) 1859 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1860 if (error) 1861 goto out; 1862 1863 /* 1864 * If the tvp exists and is in use, sillyrename it before doing the 1865 * rename of the new file over it. 1866 * XXX Can't sillyrename a directory. 1867 */ 1868 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1869 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1870 vput(tvp); 1871 tvp = NULL; 1872 } 1873 1874 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1875 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1876 tcnp->cn_thread); 1877 1878 if (fvp->v_type == VDIR) { 1879 if (tvp != NULL && tvp->v_type == VDIR) 1880 cache_purge(tdvp); 1881 cache_purge(fdvp); 1882 } 1883 1884 out: 1885 if (tdvp == tvp) 1886 vrele(tdvp); 1887 else 1888 vput(tdvp); 1889 if (tvp) 1890 vput(tvp); 1891 vrele(fdvp); 1892 vrele(fvp); 1893 /* 1894 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1895 */ 1896 if (error == ENOENT) 1897 error = 0; 1898 return (error); 1899 } 1900 1901 /* 1902 * nfs file rename rpc called from nfs_remove() above 1903 */ 1904 static int 1905 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1906 struct sillyrename *sp) 1907 { 1908 1909 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1910 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1911 } 1912 1913 /* 1914 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1915 */ 1916 static int 1917 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1918 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1919 struct thread *td) 1920 { 1921 caddr_t bpos, dpos; 1922 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1923 struct mbuf *mreq, *mrep, *md, *mb; 1924 int v3 = NFS_ISV3(fdvp); 1925 1926 nfsstats.rpccnt[NFSPROC_RENAME]++; 1927 mreq = m_get2((NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1928 nfsm_rndup(tnamelen), M_WAITOK, MT_DATA, 0); 1929 mb = mreq; 1930 bpos = mtod(mb, caddr_t); 1931 nfsm_fhtom(fdvp, v3); 1932 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1933 nfsm_fhtom(tdvp, v3); 1934 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1935 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1936 if (v3) { 1937 nfsm_wcc_data(fdvp, fwccflag); 1938 nfsm_wcc_data(tdvp, twccflag); 1939 } 1940 m_freem(mrep); 1941 nfsmout: 1942 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1943 VTONFS(fdvp)->n_flag |= NMODIFIED; 1944 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1945 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1946 VTONFS(tdvp)->n_flag |= NMODIFIED; 1947 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1948 if (!fwccflag) { 1949 VTONFS(fdvp)->n_attrstamp = 0; 1950 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1951 } 1952 if (!twccflag) { 1953 VTONFS(tdvp)->n_attrstamp = 0; 1954 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1955 } 1956 return (error); 1957 } 1958 1959 /* 1960 * nfs hard link create call 1961 */ 1962 static int 1963 nfs_link(struct vop_link_args *ap) 1964 { 1965 struct vnode *vp = ap->a_vp; 1966 struct vnode *tdvp = ap->a_tdvp; 1967 struct componentname *cnp = ap->a_cnp; 1968 caddr_t bpos, dpos; 1969 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1970 struct mbuf *mreq, *mrep, *md, *mb; 1971 int v3; 1972 1973 if (vp->v_mount != tdvp->v_mount) { 1974 return (EXDEV); 1975 } 1976 1977 /* 1978 * Push all writes to the server, so that the attribute cache 1979 * doesn't get "out of sync" with the server. 1980 * XXX There should be a better way! 1981 */ 1982 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1983 1984 v3 = NFS_ISV3(vp); 1985 nfsstats.rpccnt[NFSPROC_LINK]++; 1986 mreq = m_get2(NFSX_FH(v3)*2 + NFSX_UNSIGNED + 1987 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0); 1988 mb = mreq; 1989 bpos = mtod(mb, caddr_t); 1990 nfsm_fhtom(vp, v3); 1991 nfsm_fhtom(tdvp, v3); 1992 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1993 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1994 if (v3) { 1995 nfsm_postop_attr(vp, attrflag); 1996 nfsm_wcc_data(tdvp, wccflag); 1997 } 1998 m_freem(mrep); 1999 nfsmout: 2000 mtx_lock(&(VTONFS(tdvp))->n_mtx); 2001 VTONFS(tdvp)->n_flag |= NMODIFIED; 2002 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 2003 if (!attrflag) { 2004 VTONFS(vp)->n_attrstamp = 0; 2005 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2006 } 2007 if (!wccflag) { 2008 VTONFS(tdvp)->n_attrstamp = 0; 2009 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2010 } 2011 return (error); 2012 } 2013 2014 /* 2015 * nfs symbolic link create call 2016 */ 2017 static int 2018 nfs_symlink(struct vop_symlink_args *ap) 2019 { 2020 struct vnode *dvp = ap->a_dvp; 2021 struct vattr *vap = ap->a_vap; 2022 struct componentname *cnp = ap->a_cnp; 2023 struct nfsv2_sattr *sp; 2024 caddr_t bpos, dpos; 2025 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2026 struct mbuf *mreq, *mrep, *md, *mb; 2027 struct vnode *newvp = NULL; 2028 int v3 = NFS_ISV3(dvp); 2029 2030 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2031 slen = strlen(ap->a_target); 2032 mreq = m_get2(NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2033 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3), 2034 M_WAITOK, MT_DATA, 0); 2035 mb = mreq; 2036 bpos = mtod(mb, caddr_t); 2037 nfsm_fhtom(dvp, v3); 2038 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2039 if (v3) { 2040 nfsm_v3attrbuild(vap, FALSE); 2041 } 2042 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2043 if (!v3) { 2044 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2045 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2046 sp->sa_uid = nfs_xdrneg1; 2047 sp->sa_gid = nfs_xdrneg1; 2048 sp->sa_size = nfs_xdrneg1; 2049 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2050 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2051 } 2052 2053 /* 2054 * Issue the NFS request and get the rpc response. 2055 * 2056 * Only NFSv3 responses returning an error of 0 actually return 2057 * a file handle that can be converted into newvp without having 2058 * to do an extra lookup rpc. 2059 */ 2060 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 2061 if (v3) { 2062 if (error == 0) 2063 nfsm_mtofh(dvp, newvp, v3, gotvp); 2064 nfsm_wcc_data(dvp, wccflag); 2065 } 2066 2067 /* 2068 * out code jumps -> here, mrep is also freed. 2069 */ 2070 2071 m_freem(mrep); 2072 nfsmout: 2073 2074 /* 2075 * If we do not have an error and we could not extract the newvp from 2076 * the response due to the request being NFSv2, we have to do a 2077 * lookup in order to obtain a newvp to return. 2078 */ 2079 if (error == 0 && newvp == NULL) { 2080 struct nfsnode *np = NULL; 2081 2082 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2083 cnp->cn_cred, cnp->cn_thread, &np); 2084 if (!error) 2085 newvp = NFSTOV(np); 2086 } 2087 if (error) { 2088 if (newvp) 2089 vput(newvp); 2090 } else { 2091 *ap->a_vpp = newvp; 2092 } 2093 mtx_lock(&(VTONFS(dvp))->n_mtx); 2094 VTONFS(dvp)->n_flag |= NMODIFIED; 2095 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2096 if (!wccflag) { 2097 VTONFS(dvp)->n_attrstamp = 0; 2098 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2099 } 2100 return (error); 2101 } 2102 2103 /* 2104 * nfs make dir call 2105 */ 2106 static int 2107 nfs_mkdir(struct vop_mkdir_args *ap) 2108 { 2109 struct vnode *dvp = ap->a_dvp; 2110 struct vattr *vap = ap->a_vap; 2111 struct componentname *cnp = ap->a_cnp; 2112 struct nfsv2_sattr *sp; 2113 int len; 2114 struct nfsnode *np = NULL; 2115 struct vnode *newvp = NULL; 2116 caddr_t bpos, dpos; 2117 int error = 0, wccflag = NFSV3_WCCRATTR; 2118 int gotvp = 0; 2119 struct mbuf *mreq, *mrep, *md, *mb; 2120 struct vattr vattr; 2121 int v3 = NFS_ISV3(dvp); 2122 2123 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2124 return (error); 2125 len = cnp->cn_namelen; 2126 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2127 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + 2128 NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 2129 mb = mreq; 2130 bpos = mtod(mb, caddr_t); 2131 nfsm_fhtom(dvp, v3); 2132 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2133 if (v3) { 2134 nfsm_v3attrbuild(vap, FALSE); 2135 } else { 2136 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2137 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2138 sp->sa_uid = nfs_xdrneg1; 2139 sp->sa_gid = nfs_xdrneg1; 2140 sp->sa_size = nfs_xdrneg1; 2141 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2142 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2143 } 2144 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2145 if (!error) 2146 nfsm_mtofh(dvp, newvp, v3, gotvp); 2147 if (v3) 2148 nfsm_wcc_data(dvp, wccflag); 2149 m_freem(mrep); 2150 nfsmout: 2151 mtx_lock(&(VTONFS(dvp))->n_mtx); 2152 VTONFS(dvp)->n_flag |= NMODIFIED; 2153 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2154 if (!wccflag) { 2155 VTONFS(dvp)->n_attrstamp = 0; 2156 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2157 } 2158 if (error == 0 && newvp == NULL) { 2159 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2160 cnp->cn_thread, &np); 2161 if (!error) { 2162 newvp = NFSTOV(np); 2163 if (newvp->v_type != VDIR) 2164 error = EEXIST; 2165 } 2166 } 2167 if (error) { 2168 if (newvp) 2169 vput(newvp); 2170 } else 2171 *ap->a_vpp = newvp; 2172 return (error); 2173 } 2174 2175 /* 2176 * nfs remove directory call 2177 */ 2178 static int 2179 nfs_rmdir(struct vop_rmdir_args *ap) 2180 { 2181 struct vnode *vp = ap->a_vp; 2182 struct vnode *dvp = ap->a_dvp; 2183 struct componentname *cnp = ap->a_cnp; 2184 caddr_t bpos, dpos; 2185 int error = 0, wccflag = NFSV3_WCCRATTR; 2186 struct mbuf *mreq, *mrep, *md, *mb; 2187 int v3 = NFS_ISV3(dvp); 2188 2189 if (dvp == vp) 2190 return (EINVAL); 2191 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2192 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + 2193 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0); 2194 mb = mreq; 2195 bpos = mtod(mb, caddr_t); 2196 nfsm_fhtom(dvp, v3); 2197 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2198 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2199 if (v3) 2200 nfsm_wcc_data(dvp, wccflag); 2201 m_freem(mrep); 2202 nfsmout: 2203 mtx_lock(&(VTONFS(dvp))->n_mtx); 2204 VTONFS(dvp)->n_flag |= NMODIFIED; 2205 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2206 if (!wccflag) { 2207 VTONFS(dvp)->n_attrstamp = 0; 2208 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2209 } 2210 cache_purge(dvp); 2211 cache_purge(vp); 2212 /* 2213 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2214 */ 2215 if (error == ENOENT) 2216 error = 0; 2217 return (error); 2218 } 2219 2220 /* 2221 * nfs readdir call 2222 */ 2223 static int 2224 nfs_readdir(struct vop_readdir_args *ap) 2225 { 2226 struct vnode *vp = ap->a_vp; 2227 struct nfsnode *np = VTONFS(vp); 2228 struct uio *uio = ap->a_uio; 2229 int tresid, error = 0; 2230 struct vattr vattr; 2231 2232 if (vp->v_type != VDIR) 2233 return(EPERM); 2234 2235 /* 2236 * First, check for hit on the EOF offset cache 2237 */ 2238 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2239 (np->n_flag & NMODIFIED) == 0) { 2240 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2241 mtx_lock(&np->n_mtx); 2242 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2243 mtx_unlock(&np->n_mtx); 2244 nfsstats.direofcache_hits++; 2245 goto out; 2246 } else 2247 mtx_unlock(&np->n_mtx); 2248 } 2249 } 2250 2251 /* 2252 * Call nfs_bioread() to do the real work. 2253 */ 2254 tresid = uio->uio_resid; 2255 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2256 2257 if (!error && uio->uio_resid == tresid) { 2258 nfsstats.direofcache_misses++; 2259 } 2260 out: 2261 return (error); 2262 } 2263 2264 /* 2265 * Readdir rpc call. 2266 * Called from below the buffer cache by nfs_doio(). 2267 */ 2268 int 2269 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2270 { 2271 int len, left; 2272 struct dirent *dp = NULL; 2273 u_int32_t *tl; 2274 caddr_t cp; 2275 nfsuint64 *cookiep; 2276 caddr_t bpos, dpos; 2277 struct mbuf *mreq, *mrep, *md, *mb; 2278 nfsuint64 cookie; 2279 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2280 struct nfsnode *dnp = VTONFS(vp); 2281 u_quad_t fileno; 2282 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2283 int attrflag; 2284 int v3 = NFS_ISV3(vp); 2285 2286 KASSERT(uiop->uio_iovcnt == 1 && 2287 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2288 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2289 ("nfs readdirrpc bad uio")); 2290 2291 /* 2292 * If there is no cookie, assume directory was stale. 2293 */ 2294 nfs_dircookie_lock(dnp); 2295 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2296 if (cookiep) { 2297 cookie = *cookiep; 2298 nfs_dircookie_unlock(dnp); 2299 } else { 2300 nfs_dircookie_unlock(dnp); 2301 return (NFSERR_BAD_COOKIE); 2302 } 2303 2304 /* 2305 * Loop around doing readdir rpc's of size nm_readdirsize 2306 * truncated to a multiple of DIRBLKSIZ. 2307 * The stopping criteria is EOF or buffer full. 2308 */ 2309 while (more_dirs && bigenough) { 2310 nfsstats.rpccnt[NFSPROC_READDIR]++; 2311 mreq = m_get2(NFSX_FH(v3) + NFSX_READDIR(v3), M_WAITOK, 2312 MT_DATA, 0); 2313 mb = mreq; 2314 bpos = mtod(mb, caddr_t); 2315 nfsm_fhtom(vp, v3); 2316 if (v3) { 2317 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2318 *tl++ = cookie.nfsuquad[0]; 2319 *tl++ = cookie.nfsuquad[1]; 2320 mtx_lock(&dnp->n_mtx); 2321 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2322 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2323 mtx_unlock(&dnp->n_mtx); 2324 } else { 2325 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2326 *tl++ = cookie.nfsuquad[0]; 2327 } 2328 *tl = txdr_unsigned(nmp->nm_readdirsize); 2329 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2330 if (v3) { 2331 nfsm_postop_attr(vp, attrflag); 2332 if (!error) { 2333 tl = nfsm_dissect(u_int32_t *, 2334 2 * NFSX_UNSIGNED); 2335 mtx_lock(&dnp->n_mtx); 2336 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2337 dnp->n_cookieverf.nfsuquad[1] = *tl; 2338 mtx_unlock(&dnp->n_mtx); 2339 } else { 2340 m_freem(mrep); 2341 goto nfsmout; 2342 } 2343 } 2344 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2345 more_dirs = fxdr_unsigned(int, *tl); 2346 2347 /* loop thru the dir entries, doctoring them to 4bsd form */ 2348 while (more_dirs && bigenough) { 2349 if (v3) { 2350 tl = nfsm_dissect(u_int32_t *, 2351 3 * NFSX_UNSIGNED); 2352 fileno = fxdr_hyper(tl); 2353 len = fxdr_unsigned(int, *(tl + 2)); 2354 } else { 2355 tl = nfsm_dissect(u_int32_t *, 2356 2 * NFSX_UNSIGNED); 2357 fileno = fxdr_unsigned(u_quad_t, *tl++); 2358 len = fxdr_unsigned(int, *tl); 2359 } 2360 if (len <= 0 || len > NFS_MAXNAMLEN) { 2361 error = EBADRPC; 2362 m_freem(mrep); 2363 goto nfsmout; 2364 } 2365 tlen = nfsm_rndup(len); 2366 if (tlen == len) 2367 tlen += 4; /* To ensure null termination */ 2368 left = DIRBLKSIZ - blksiz; 2369 if ((tlen + DIRHDSIZ) > left) { 2370 dp->d_reclen += left; 2371 uiop->uio_iov->iov_base = 2372 (char *)uiop->uio_iov->iov_base + left; 2373 uiop->uio_iov->iov_len -= left; 2374 uiop->uio_offset += left; 2375 uiop->uio_resid -= left; 2376 blksiz = 0; 2377 } 2378 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2379 bigenough = 0; 2380 if (bigenough) { 2381 dp = (struct dirent *)uiop->uio_iov->iov_base; 2382 dp->d_fileno = (int)fileno; 2383 dp->d_namlen = len; 2384 dp->d_reclen = tlen + DIRHDSIZ; 2385 dp->d_type = DT_UNKNOWN; 2386 blksiz += dp->d_reclen; 2387 if (blksiz == DIRBLKSIZ) 2388 blksiz = 0; 2389 uiop->uio_offset += DIRHDSIZ; 2390 uiop->uio_resid -= DIRHDSIZ; 2391 uiop->uio_iov->iov_base = 2392 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2393 uiop->uio_iov->iov_len -= DIRHDSIZ; 2394 nfsm_mtouio(uiop, len); 2395 cp = uiop->uio_iov->iov_base; 2396 tlen -= len; 2397 *cp = '\0'; /* null terminate */ 2398 uiop->uio_iov->iov_base = 2399 (char *)uiop->uio_iov->iov_base + tlen; 2400 uiop->uio_iov->iov_len -= tlen; 2401 uiop->uio_offset += tlen; 2402 uiop->uio_resid -= tlen; 2403 } else 2404 nfsm_adv(nfsm_rndup(len)); 2405 if (v3) { 2406 tl = nfsm_dissect(u_int32_t *, 2407 3 * NFSX_UNSIGNED); 2408 } else { 2409 tl = nfsm_dissect(u_int32_t *, 2410 2 * NFSX_UNSIGNED); 2411 } 2412 if (bigenough) { 2413 cookie.nfsuquad[0] = *tl++; 2414 if (v3) 2415 cookie.nfsuquad[1] = *tl++; 2416 } else if (v3) 2417 tl += 2; 2418 else 2419 tl++; 2420 more_dirs = fxdr_unsigned(int, *tl); 2421 } 2422 /* 2423 * If at end of rpc data, get the eof boolean 2424 */ 2425 if (!more_dirs) { 2426 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2427 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2428 } 2429 m_freem(mrep); 2430 } 2431 /* 2432 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2433 * by increasing d_reclen for the last record. 2434 */ 2435 if (blksiz > 0) { 2436 left = DIRBLKSIZ - blksiz; 2437 dp->d_reclen += left; 2438 uiop->uio_iov->iov_base = 2439 (char *)uiop->uio_iov->iov_base + left; 2440 uiop->uio_iov->iov_len -= left; 2441 uiop->uio_offset += left; 2442 uiop->uio_resid -= left; 2443 } 2444 2445 /* 2446 * We are now either at the end of the directory or have filled the 2447 * block. 2448 */ 2449 if (bigenough) 2450 dnp->n_direofoffset = uiop->uio_offset; 2451 else { 2452 if (uiop->uio_resid > 0) 2453 nfs_printf("EEK! readdirrpc resid > 0\n"); 2454 nfs_dircookie_lock(dnp); 2455 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2456 *cookiep = cookie; 2457 nfs_dircookie_unlock(dnp); 2458 } 2459 nfsmout: 2460 return (error); 2461 } 2462 2463 /* 2464 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2465 */ 2466 int 2467 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2468 { 2469 int len, left; 2470 struct dirent *dp; 2471 u_int32_t *tl; 2472 caddr_t cp; 2473 struct vnode *newvp; 2474 nfsuint64 *cookiep; 2475 caddr_t bpos, dpos, dpossav1, dpossav2; 2476 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2477 struct nameidata nami, *ndp = &nami; 2478 struct componentname *cnp = &ndp->ni_cnd; 2479 nfsuint64 cookie; 2480 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2481 struct nfsnode *dnp = VTONFS(vp), *np; 2482 struct vattr vattr, dvattr; 2483 nfsfh_t *fhp; 2484 u_quad_t fileno; 2485 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2486 int attrflag, dattrflag, fhsize; 2487 2488 #ifndef nolint 2489 dp = NULL; 2490 #endif 2491 KASSERT(uiop->uio_iovcnt == 1 && 2492 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2493 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2494 ("nfs readdirplusrpc bad uio")); 2495 ndp->ni_dvp = vp; 2496 newvp = NULLVP; 2497 2498 /* 2499 * If there is no cookie, assume directory was stale. 2500 */ 2501 nfs_dircookie_lock(dnp); 2502 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2503 if (cookiep) { 2504 cookie = *cookiep; 2505 nfs_dircookie_unlock(dnp); 2506 } else { 2507 nfs_dircookie_unlock(dnp); 2508 return (NFSERR_BAD_COOKIE); 2509 } 2510 /* 2511 * Loop around doing readdir rpc's of size nm_readdirsize 2512 * truncated to a multiple of DIRBLKSIZ. 2513 * The stopping criteria is EOF or buffer full. 2514 */ 2515 while (more_dirs && bigenough) { 2516 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2517 mreq = m_get2(NFSX_FH(1) + 6 * NFSX_UNSIGNED, M_WAITOK, 2518 MT_DATA, 0); 2519 mb = mreq; 2520 bpos = mtod(mb, caddr_t); 2521 nfsm_fhtom(vp, 1); 2522 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2523 *tl++ = cookie.nfsuquad[0]; 2524 *tl++ = cookie.nfsuquad[1]; 2525 mtx_lock(&dnp->n_mtx); 2526 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2527 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2528 mtx_unlock(&dnp->n_mtx); 2529 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2530 *tl = txdr_unsigned(nmp->nm_rsize); 2531 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2532 nfsm_postop_attr_va(vp, dattrflag, &dvattr); 2533 if (error) { 2534 m_freem(mrep); 2535 goto nfsmout; 2536 } 2537 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2538 mtx_lock(&dnp->n_mtx); 2539 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2540 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2541 mtx_unlock(&dnp->n_mtx); 2542 more_dirs = fxdr_unsigned(int, *tl); 2543 2544 /* loop thru the dir entries, doctoring them to 4bsd form */ 2545 while (more_dirs && bigenough) { 2546 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2547 fileno = fxdr_hyper(tl); 2548 len = fxdr_unsigned(int, *(tl + 2)); 2549 if (len <= 0 || len > NFS_MAXNAMLEN) { 2550 error = EBADRPC; 2551 m_freem(mrep); 2552 goto nfsmout; 2553 } 2554 tlen = nfsm_rndup(len); 2555 if (tlen == len) 2556 tlen += 4; /* To ensure null termination*/ 2557 left = DIRBLKSIZ - blksiz; 2558 if ((tlen + DIRHDSIZ) > left) { 2559 dp->d_reclen += left; 2560 uiop->uio_iov->iov_base = 2561 (char *)uiop->uio_iov->iov_base + left; 2562 uiop->uio_iov->iov_len -= left; 2563 uiop->uio_offset += left; 2564 uiop->uio_resid -= left; 2565 blksiz = 0; 2566 } 2567 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2568 bigenough = 0; 2569 if (bigenough) { 2570 dp = (struct dirent *)uiop->uio_iov->iov_base; 2571 dp->d_fileno = (int)fileno; 2572 dp->d_namlen = len; 2573 dp->d_reclen = tlen + DIRHDSIZ; 2574 dp->d_type = DT_UNKNOWN; 2575 blksiz += dp->d_reclen; 2576 if (blksiz == DIRBLKSIZ) 2577 blksiz = 0; 2578 uiop->uio_offset += DIRHDSIZ; 2579 uiop->uio_resid -= DIRHDSIZ; 2580 uiop->uio_iov->iov_base = 2581 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2582 uiop->uio_iov->iov_len -= DIRHDSIZ; 2583 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2584 cnp->cn_namelen = len; 2585 nfsm_mtouio(uiop, len); 2586 cp = uiop->uio_iov->iov_base; 2587 tlen -= len; 2588 *cp = '\0'; 2589 uiop->uio_iov->iov_base = 2590 (char *)uiop->uio_iov->iov_base + tlen; 2591 uiop->uio_iov->iov_len -= tlen; 2592 uiop->uio_offset += tlen; 2593 uiop->uio_resid -= tlen; 2594 } else 2595 nfsm_adv(nfsm_rndup(len)); 2596 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2597 if (bigenough) { 2598 cookie.nfsuquad[0] = *tl++; 2599 cookie.nfsuquad[1] = *tl++; 2600 } else 2601 tl += 2; 2602 2603 /* 2604 * Since the attributes are before the file handle 2605 * (sigh), we must skip over the attributes and then 2606 * come back and get them. 2607 */ 2608 attrflag = fxdr_unsigned(int, *tl); 2609 if (attrflag) { 2610 dpossav1 = dpos; 2611 mdsav1 = md; 2612 nfsm_adv(NFSX_V3FATTR); 2613 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2614 doit = fxdr_unsigned(int, *tl); 2615 /* 2616 * Skip loading the attrs for "..". There's a 2617 * race between loading the attrs here and 2618 * lookups that look for the directory currently 2619 * being read (in the parent). We try to acquire 2620 * the exclusive lock on ".." here, owning the 2621 * lock on the directory being read. Lookup will 2622 * hold the lock on ".." and try to acquire the 2623 * lock on the directory being read. 2624 * 2625 * There are other ways of fixing this, one would 2626 * be to do a trylock on the ".." vnode and skip 2627 * loading the attrs on ".." if it happens to be 2628 * locked by another process. But skipping the 2629 * attrload on ".." seems the easiest option. 2630 */ 2631 if (strcmp(dp->d_name, "..") == 0) { 2632 doit = 0; 2633 /* 2634 * We've already skipped over the attrs, 2635 * skip over the filehandle. And store d_type 2636 * as VDIR. 2637 */ 2638 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2639 i = fxdr_unsigned(int, *tl); 2640 nfsm_adv(nfsm_rndup(i)); 2641 dp->d_type = IFTODT(VTTOIF(VDIR)); 2642 } 2643 if (doit) { 2644 nfsm_getfh(fhp, fhsize, 1); 2645 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2646 VREF(vp); 2647 newvp = vp; 2648 np = dnp; 2649 } else { 2650 error = nfs_nget(vp->v_mount, fhp, 2651 fhsize, &np, LK_EXCLUSIVE); 2652 if (error) 2653 doit = 0; 2654 else 2655 newvp = NFSTOV(np); 2656 } 2657 } 2658 if (doit && bigenough) { 2659 dpossav2 = dpos; 2660 dpos = dpossav1; 2661 mdsav2 = md; 2662 md = mdsav1; 2663 nfsm_loadattr(newvp, &vattr); 2664 dpos = dpossav2; 2665 md = mdsav2; 2666 dp->d_type = IFTODT(VTTOIF(vattr.va_type)); 2667 ndp->ni_vp = newvp; 2668 if (newvp->v_type != VDIR || dattrflag != 0) 2669 cache_enter_time(ndp->ni_dvp, ndp->ni_vp, 2670 cnp, &vattr.va_ctime, 2671 newvp->v_type != VDIR ? NULL : 2672 &dvattr.va_ctime); 2673 } 2674 } else { 2675 /* Just skip over the file handle */ 2676 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2677 i = fxdr_unsigned(int, *tl); 2678 if (i) { 2679 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2680 fhsize = fxdr_unsigned(int, *tl); 2681 nfsm_adv(nfsm_rndup(fhsize)); 2682 } 2683 } 2684 if (newvp != NULLVP) { 2685 if (newvp == vp) 2686 vrele(newvp); 2687 else 2688 vput(newvp); 2689 newvp = NULLVP; 2690 } 2691 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2692 more_dirs = fxdr_unsigned(int, *tl); 2693 } 2694 /* 2695 * If at end of rpc data, get the eof boolean 2696 */ 2697 if (!more_dirs) { 2698 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2699 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2700 } 2701 m_freem(mrep); 2702 } 2703 /* 2704 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2705 * by increasing d_reclen for the last record. 2706 */ 2707 if (blksiz > 0) { 2708 left = DIRBLKSIZ - blksiz; 2709 dp->d_reclen += left; 2710 uiop->uio_iov->iov_base = 2711 (char *)uiop->uio_iov->iov_base + left; 2712 uiop->uio_iov->iov_len -= left; 2713 uiop->uio_offset += left; 2714 uiop->uio_resid -= left; 2715 } 2716 2717 /* 2718 * We are now either at the end of the directory or have filled the 2719 * block. 2720 */ 2721 if (bigenough) 2722 dnp->n_direofoffset = uiop->uio_offset; 2723 else { 2724 if (uiop->uio_resid > 0) 2725 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2726 nfs_dircookie_lock(dnp); 2727 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2728 *cookiep = cookie; 2729 nfs_dircookie_unlock(dnp); 2730 } 2731 nfsmout: 2732 if (newvp != NULLVP) { 2733 if (newvp == vp) 2734 vrele(newvp); 2735 else 2736 vput(newvp); 2737 newvp = NULLVP; 2738 } 2739 return (error); 2740 } 2741 2742 /* 2743 * Silly rename. To make the NFS filesystem that is stateless look a little 2744 * more like the "ufs" a remove of an active vnode is translated to a rename 2745 * to a funny looking filename that is removed by nfs_inactive on the 2746 * nfsnode. There is the potential for another process on a different client 2747 * to create the same funny name between the nfs_lookitup() fails and the 2748 * nfs_rename() completes, but... 2749 */ 2750 static int 2751 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2752 { 2753 struct sillyrename *sp; 2754 struct nfsnode *np; 2755 int error; 2756 short pid; 2757 unsigned int lticks; 2758 2759 cache_purge(dvp); 2760 np = VTONFS(vp); 2761 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2762 sp = malloc(sizeof (struct sillyrename), 2763 M_NFSREQ, M_WAITOK); 2764 sp->s_cred = crhold(cnp->cn_cred); 2765 sp->s_dvp = dvp; 2766 sp->s_removeit = nfs_removeit; 2767 VREF(dvp); 2768 2769 /* 2770 * Fudge together a funny name. 2771 * Changing the format of the funny name to accomodate more 2772 * sillynames per directory. 2773 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2774 * CPU ticks since boot. 2775 */ 2776 pid = cnp->cn_thread->td_proc->p_pid; 2777 lticks = (unsigned int)ticks; 2778 for ( ; ; ) { 2779 sp->s_namlen = sprintf(sp->s_name, 2780 ".nfs.%08x.%04x4.4", lticks, 2781 pid); 2782 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2783 cnp->cn_thread, NULL)) 2784 break; 2785 lticks++; 2786 } 2787 error = nfs_renameit(dvp, cnp, sp); 2788 if (error) 2789 goto bad; 2790 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2791 cnp->cn_thread, &np); 2792 np->n_sillyrename = sp; 2793 return (0); 2794 bad: 2795 vrele(sp->s_dvp); 2796 crfree(sp->s_cred); 2797 free((caddr_t)sp, M_NFSREQ); 2798 return (error); 2799 } 2800 2801 /* 2802 * Look up a file name and optionally either update the file handle or 2803 * allocate an nfsnode, depending on the value of npp. 2804 * npp == NULL --> just do the lookup 2805 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2806 * handled too 2807 * *npp != NULL --> update the file handle in the vnode 2808 */ 2809 static int 2810 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2811 struct thread *td, struct nfsnode **npp) 2812 { 2813 struct vnode *newvp = NULL; 2814 struct nfsnode *np, *dnp = VTONFS(dvp); 2815 caddr_t bpos, dpos; 2816 int error = 0, fhlen, attrflag; 2817 struct mbuf *mreq, *mrep, *md, *mb; 2818 nfsfh_t *nfhp; 2819 int v3 = NFS_ISV3(dvp); 2820 2821 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2822 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len), 2823 M_WAITOK, MT_DATA, 0); 2824 mb = mreq; 2825 bpos = mtod(mb, caddr_t); 2826 nfsm_fhtom(dvp, v3); 2827 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2828 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2829 if (npp && !error) { 2830 nfsm_getfh(nfhp, fhlen, v3); 2831 if (*npp) { 2832 np = *npp; 2833 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2834 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2835 np->n_fhp = &np->n_fh; 2836 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2837 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2838 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2839 np->n_fhsize = fhlen; 2840 newvp = NFSTOV(np); 2841 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2842 VREF(dvp); 2843 newvp = dvp; 2844 } else { 2845 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2846 if (error) { 2847 m_freem(mrep); 2848 return (error); 2849 } 2850 newvp = NFSTOV(np); 2851 } 2852 if (v3) { 2853 nfsm_postop_attr(newvp, attrflag); 2854 if (!attrflag && *npp == NULL) { 2855 m_freem(mrep); 2856 if (newvp == dvp) 2857 vrele(newvp); 2858 else 2859 vput(newvp); 2860 return (ENOENT); 2861 } 2862 } else 2863 nfsm_loadattr(newvp, NULL); 2864 } 2865 m_freem(mrep); 2866 nfsmout: 2867 if (npp && *npp == NULL) { 2868 if (error) { 2869 if (newvp) { 2870 if (newvp == dvp) 2871 vrele(newvp); 2872 else 2873 vput(newvp); 2874 } 2875 } else 2876 *npp = np; 2877 } 2878 return (error); 2879 } 2880 2881 /* 2882 * Nfs Version 3 commit rpc 2883 */ 2884 int 2885 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2886 struct thread *td) 2887 { 2888 u_int32_t *tl; 2889 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2890 caddr_t bpos, dpos; 2891 int error = 0, wccflag = NFSV3_WCCRATTR; 2892 struct mbuf *mreq, *mrep, *md, *mb; 2893 2894 mtx_lock(&nmp->nm_mtx); 2895 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2896 mtx_unlock(&nmp->nm_mtx); 2897 return (0); 2898 } 2899 mtx_unlock(&nmp->nm_mtx); 2900 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2901 mreq = m_get2(NFSX_FH(1), M_WAITOK, MT_DATA, 0); 2902 mb = mreq; 2903 bpos = mtod(mb, caddr_t); 2904 nfsm_fhtom(vp, 1); 2905 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2906 txdr_hyper(offset, tl); 2907 tl += 2; 2908 *tl = txdr_unsigned(cnt); 2909 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2910 nfsm_wcc_data(vp, wccflag); 2911 if (!error) { 2912 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2913 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2914 NFSX_V3WRITEVERF)) { 2915 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2916 NFSX_V3WRITEVERF); 2917 error = NFSERR_STALEWRITEVERF; 2918 } 2919 } 2920 m_freem(mrep); 2921 nfsmout: 2922 return (error); 2923 } 2924 2925 /* 2926 * Strategy routine. 2927 * For async requests when nfsiod(s) are running, queue the request by 2928 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2929 * request. 2930 */ 2931 static int 2932 nfs_strategy(struct vop_strategy_args *ap) 2933 { 2934 struct buf *bp = ap->a_bp; 2935 struct ucred *cr; 2936 2937 KASSERT(!(bp->b_flags & B_DONE), 2938 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2939 BUF_ASSERT_HELD(bp); 2940 2941 if (bp->b_iocmd == BIO_READ) 2942 cr = bp->b_rcred; 2943 else 2944 cr = bp->b_wcred; 2945 2946 /* 2947 * If the op is asynchronous and an i/o daemon is waiting 2948 * queue the request, wake it up and wait for completion 2949 * otherwise just do it ourselves. 2950 */ 2951 if ((bp->b_flags & B_ASYNC) == 0 || 2952 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2953 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2954 return (0); 2955 } 2956 2957 /* 2958 * fsync vnode op. Just call nfs_flush() with commit == 1. 2959 */ 2960 /* ARGSUSED */ 2961 static int 2962 nfs_fsync(struct vop_fsync_args *ap) 2963 { 2964 2965 return (nfs_flush(ap->a_vp, ap->a_waitfor, 1)); 2966 } 2967 2968 /* 2969 * Flush all the blocks associated with a vnode. 2970 * Walk through the buffer pool and push any dirty pages 2971 * associated with the vnode. 2972 */ 2973 static int 2974 nfs_flush(struct vnode *vp, int waitfor, int commit) 2975 { 2976 struct nfsnode *np = VTONFS(vp); 2977 struct buf *bp; 2978 int i; 2979 struct buf *nbp; 2980 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2981 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2982 int passone = 1; 2983 u_quad_t off, endoff, toff; 2984 struct ucred* wcred = NULL; 2985 struct buf **bvec = NULL; 2986 struct bufobj *bo; 2987 struct thread *td = curthread; 2988 #ifndef NFS_COMMITBVECSIZ 2989 #define NFS_COMMITBVECSIZ 20 2990 #endif 2991 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2992 int bvecsize = 0, bveccount; 2993 2994 if (nmp->nm_flag & NFSMNT_INT) 2995 slpflag = PCATCH; 2996 if (!commit) 2997 passone = 0; 2998 bo = &vp->v_bufobj; 2999 /* 3000 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 3001 * server, but has not been committed to stable storage on the server 3002 * yet. On the first pass, the byte range is worked out and the commit 3003 * rpc is done. On the second pass, nfs_writebp() is called to do the 3004 * job. 3005 */ 3006 again: 3007 off = (u_quad_t)-1; 3008 endoff = 0; 3009 bvecpos = 0; 3010 if (NFS_ISV3(vp) && commit) { 3011 if (bvec != NULL && bvec != bvec_on_stack) 3012 free(bvec, M_TEMP); 3013 /* 3014 * Count up how many buffers waiting for a commit. 3015 */ 3016 bveccount = 0; 3017 BO_LOCK(bo); 3018 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3019 if (!BUF_ISLOCKED(bp) && 3020 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 3021 == (B_DELWRI | B_NEEDCOMMIT)) 3022 bveccount++; 3023 } 3024 /* 3025 * Allocate space to remember the list of bufs to commit. It is 3026 * important to use M_NOWAIT here to avoid a race with nfs_write. 3027 * If we can't get memory (for whatever reason), we will end up 3028 * committing the buffers one-by-one in the loop below. 3029 */ 3030 if (bveccount > NFS_COMMITBVECSIZ) { 3031 /* 3032 * Release the vnode interlock to avoid a lock 3033 * order reversal. 3034 */ 3035 BO_UNLOCK(bo); 3036 bvec = (struct buf **) 3037 malloc(bveccount * sizeof(struct buf *), 3038 M_TEMP, M_NOWAIT); 3039 BO_LOCK(bo); 3040 if (bvec == NULL) { 3041 bvec = bvec_on_stack; 3042 bvecsize = NFS_COMMITBVECSIZ; 3043 } else 3044 bvecsize = bveccount; 3045 } else { 3046 bvec = bvec_on_stack; 3047 bvecsize = NFS_COMMITBVECSIZ; 3048 } 3049 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3050 if (bvecpos >= bvecsize) 3051 break; 3052 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3053 nbp = TAILQ_NEXT(bp, b_bobufs); 3054 continue; 3055 } 3056 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3057 (B_DELWRI | B_NEEDCOMMIT)) { 3058 BUF_UNLOCK(bp); 3059 nbp = TAILQ_NEXT(bp, b_bobufs); 3060 continue; 3061 } 3062 BO_UNLOCK(bo); 3063 bremfree(bp); 3064 /* 3065 * Work out if all buffers are using the same cred 3066 * so we can deal with them all with one commit. 3067 * 3068 * NOTE: we are not clearing B_DONE here, so we have 3069 * to do it later on in this routine if we intend to 3070 * initiate I/O on the bp. 3071 * 3072 * Note: to avoid loopback deadlocks, we do not 3073 * assign b_runningbufspace. 3074 */ 3075 if (wcred == NULL) 3076 wcred = bp->b_wcred; 3077 else if (wcred != bp->b_wcred) 3078 wcred = NOCRED; 3079 vfs_busy_pages(bp, 1); 3080 3081 BO_LOCK(bo); 3082 /* 3083 * bp is protected by being locked, but nbp is not 3084 * and vfs_busy_pages() may sleep. We have to 3085 * recalculate nbp. 3086 */ 3087 nbp = TAILQ_NEXT(bp, b_bobufs); 3088 3089 /* 3090 * A list of these buffers is kept so that the 3091 * second loop knows which buffers have actually 3092 * been committed. This is necessary, since there 3093 * may be a race between the commit rpc and new 3094 * uncommitted writes on the file. 3095 */ 3096 bvec[bvecpos++] = bp; 3097 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3098 bp->b_dirtyoff; 3099 if (toff < off) 3100 off = toff; 3101 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3102 if (toff > endoff) 3103 endoff = toff; 3104 } 3105 BO_UNLOCK(bo); 3106 } 3107 if (bvecpos > 0) { 3108 /* 3109 * Commit data on the server, as required. 3110 * If all bufs are using the same wcred, then use that with 3111 * one call for all of them, otherwise commit each one 3112 * separately. 3113 */ 3114 if (wcred != NOCRED) 3115 retv = nfs_commit(vp, off, (int)(endoff - off), 3116 wcred, td); 3117 else { 3118 retv = 0; 3119 for (i = 0; i < bvecpos; i++) { 3120 off_t off, size; 3121 bp = bvec[i]; 3122 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3123 bp->b_dirtyoff; 3124 size = (u_quad_t)(bp->b_dirtyend 3125 - bp->b_dirtyoff); 3126 retv = nfs_commit(vp, off, (int)size, 3127 bp->b_wcred, td); 3128 if (retv) break; 3129 } 3130 } 3131 3132 if (retv == NFSERR_STALEWRITEVERF) 3133 nfs_clearcommit(vp->v_mount); 3134 3135 /* 3136 * Now, either mark the blocks I/O done or mark the 3137 * blocks dirty, depending on whether the commit 3138 * succeeded. 3139 */ 3140 for (i = 0; i < bvecpos; i++) { 3141 bp = bvec[i]; 3142 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3143 if (retv) { 3144 /* 3145 * Error, leave B_DELWRI intact 3146 */ 3147 vfs_unbusy_pages(bp); 3148 brelse(bp); 3149 } else { 3150 /* 3151 * Success, remove B_DELWRI ( bundirty() ). 3152 * 3153 * b_dirtyoff/b_dirtyend seem to be NFS 3154 * specific. We should probably move that 3155 * into bundirty(). XXX 3156 */ 3157 bufobj_wref(bo); 3158 bp->b_flags |= B_ASYNC; 3159 bundirty(bp); 3160 bp->b_flags &= ~B_DONE; 3161 bp->b_ioflags &= ~BIO_ERROR; 3162 bp->b_dirtyoff = bp->b_dirtyend = 0; 3163 bufdone(bp); 3164 } 3165 } 3166 } 3167 3168 /* 3169 * Start/do any write(s) that are required. 3170 */ 3171 loop: 3172 BO_LOCK(bo); 3173 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3174 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3175 if (waitfor != MNT_WAIT || passone) 3176 continue; 3177 3178 error = BUF_TIMELOCK(bp, 3179 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3180 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3181 if (error == 0) { 3182 BUF_UNLOCK(bp); 3183 goto loop; 3184 } 3185 if (error == ENOLCK) { 3186 error = 0; 3187 goto loop; 3188 } 3189 if (nfs_sigintr(nmp, td)) { 3190 error = EINTR; 3191 goto done; 3192 } 3193 if (slpflag == PCATCH) { 3194 slpflag = 0; 3195 slptimeo = 2 * hz; 3196 } 3197 goto loop; 3198 } 3199 if ((bp->b_flags & B_DELWRI) == 0) 3200 panic("nfs_fsync: not dirty"); 3201 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3202 BUF_UNLOCK(bp); 3203 continue; 3204 } 3205 BO_UNLOCK(bo); 3206 bremfree(bp); 3207 if (passone || !commit) 3208 bp->b_flags |= B_ASYNC; 3209 else 3210 bp->b_flags |= B_ASYNC; 3211 bwrite(bp); 3212 if (nfs_sigintr(nmp, td)) { 3213 error = EINTR; 3214 goto done; 3215 } 3216 goto loop; 3217 } 3218 if (passone) { 3219 passone = 0; 3220 BO_UNLOCK(bo); 3221 goto again; 3222 } 3223 if (waitfor == MNT_WAIT) { 3224 while (bo->bo_numoutput) { 3225 error = bufobj_wwait(bo, slpflag, slptimeo); 3226 if (error) { 3227 BO_UNLOCK(bo); 3228 error = nfs_sigintr(nmp, td); 3229 if (error) 3230 goto done; 3231 if (slpflag == PCATCH) { 3232 slpflag = 0; 3233 slptimeo = 2 * hz; 3234 } 3235 BO_LOCK(bo); 3236 } 3237 } 3238 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3239 BO_UNLOCK(bo); 3240 goto loop; 3241 } 3242 /* 3243 * Wait for all the async IO requests to drain 3244 */ 3245 BO_UNLOCK(bo); 3246 mtx_lock(&np->n_mtx); 3247 while (np->n_directio_asyncwr > 0) { 3248 np->n_flag |= NFSYNCWAIT; 3249 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3250 &np->n_mtx, slpflag | (PRIBIO + 1), 3251 "nfsfsync", 0); 3252 if (error) { 3253 if (nfs_sigintr(nmp, td)) { 3254 mtx_unlock(&np->n_mtx); 3255 error = EINTR; 3256 goto done; 3257 } 3258 } 3259 } 3260 mtx_unlock(&np->n_mtx); 3261 } else 3262 BO_UNLOCK(bo); 3263 mtx_lock(&np->n_mtx); 3264 if (np->n_flag & NWRITEERR) { 3265 error = np->n_error; 3266 np->n_flag &= ~NWRITEERR; 3267 } 3268 if (commit && bo->bo_dirty.bv_cnt == 0 && 3269 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3270 np->n_flag &= ~NMODIFIED; 3271 mtx_unlock(&np->n_mtx); 3272 done: 3273 if (bvec != NULL && bvec != bvec_on_stack) 3274 free(bvec, M_TEMP); 3275 return (error); 3276 } 3277 3278 /* 3279 * NFS advisory byte-level locks. 3280 */ 3281 static int 3282 nfs_advlock(struct vop_advlock_args *ap) 3283 { 3284 struct vnode *vp = ap->a_vp; 3285 u_quad_t size; 3286 int error; 3287 3288 error = vn_lock(vp, LK_SHARED); 3289 if (error) 3290 return (error); 3291 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3292 size = VTONFS(vp)->n_size; 3293 VOP_UNLOCK(vp, 0); 3294 error = lf_advlock(ap, &(vp->v_lockf), size); 3295 } else { 3296 if (nfs_advlock_p) 3297 error = nfs_advlock_p(ap); 3298 else 3299 error = ENOLCK; 3300 } 3301 3302 return (error); 3303 } 3304 3305 /* 3306 * NFS advisory byte-level locks. 3307 */ 3308 static int 3309 nfs_advlockasync(struct vop_advlockasync_args *ap) 3310 { 3311 struct vnode *vp = ap->a_vp; 3312 u_quad_t size; 3313 int error; 3314 3315 error = vn_lock(vp, LK_SHARED); 3316 if (error) 3317 return (error); 3318 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3319 size = VTONFS(vp)->n_size; 3320 VOP_UNLOCK(vp, 0); 3321 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3322 } else { 3323 VOP_UNLOCK(vp, 0); 3324 error = EOPNOTSUPP; 3325 } 3326 return (error); 3327 } 3328 3329 /* 3330 * Print out the contents of an nfsnode. 3331 */ 3332 static int 3333 nfs_print(struct vop_print_args *ap) 3334 { 3335 struct vnode *vp = ap->a_vp; 3336 struct nfsnode *np = VTONFS(vp); 3337 3338 nfs_printf("\tfileid %ld fsid 0x%x", 3339 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3340 if (vp->v_type == VFIFO) 3341 fifo_printinfo(vp); 3342 printf("\n"); 3343 return (0); 3344 } 3345 3346 /* 3347 * This is the "real" nfs::bwrite(struct buf*). 3348 * We set B_CACHE if this is a VMIO buffer. 3349 */ 3350 int 3351 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3352 { 3353 int s; 3354 int oldflags = bp->b_flags; 3355 #if 0 3356 int retv = 1; 3357 off_t off; 3358 #endif 3359 3360 BUF_ASSERT_HELD(bp); 3361 3362 if (bp->b_flags & B_INVAL) { 3363 brelse(bp); 3364 return(0); 3365 } 3366 3367 bp->b_flags |= B_CACHE; 3368 3369 /* 3370 * Undirty the bp. We will redirty it later if the I/O fails. 3371 */ 3372 3373 s = splbio(); 3374 bundirty(bp); 3375 bp->b_flags &= ~B_DONE; 3376 bp->b_ioflags &= ~BIO_ERROR; 3377 bp->b_iocmd = BIO_WRITE; 3378 3379 bufobj_wref(bp->b_bufobj); 3380 curthread->td_ru.ru_oublock++; 3381 splx(s); 3382 3383 /* 3384 * Note: to avoid loopback deadlocks, we do not 3385 * assign b_runningbufspace. 3386 */ 3387 vfs_busy_pages(bp, 1); 3388 3389 BUF_KERNPROC(bp); 3390 bp->b_iooffset = dbtob(bp->b_blkno); 3391 bstrategy(bp); 3392 3393 if( (oldflags & B_ASYNC) == 0) { 3394 int rtval = bufwait(bp); 3395 3396 if (oldflags & B_DELWRI) { 3397 s = splbio(); 3398 reassignbuf(bp); 3399 splx(s); 3400 } 3401 brelse(bp); 3402 return (rtval); 3403 } 3404 3405 return (0); 3406 } 3407 3408 /* 3409 * nfs special file access vnode op. 3410 * Essentially just get vattr and then imitate iaccess() since the device is 3411 * local to the client. 3412 */ 3413 static int 3414 nfsspec_access(struct vop_access_args *ap) 3415 { 3416 struct vattr *vap; 3417 struct ucred *cred = ap->a_cred; 3418 struct vnode *vp = ap->a_vp; 3419 accmode_t accmode = ap->a_accmode; 3420 struct vattr vattr; 3421 int error; 3422 3423 /* 3424 * Disallow write attempts on filesystems mounted read-only; 3425 * unless the file is a socket, fifo, or a block or character 3426 * device resident on the filesystem. 3427 */ 3428 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3429 switch (vp->v_type) { 3430 case VREG: 3431 case VDIR: 3432 case VLNK: 3433 return (EROFS); 3434 default: 3435 break; 3436 } 3437 } 3438 vap = &vattr; 3439 error = VOP_GETATTR(vp, vap, cred); 3440 if (error) 3441 goto out; 3442 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3443 accmode, cred, NULL); 3444 out: 3445 return error; 3446 } 3447 3448 /* 3449 * Read wrapper for fifos. 3450 */ 3451 static int 3452 nfsfifo_read(struct vop_read_args *ap) 3453 { 3454 struct nfsnode *np = VTONFS(ap->a_vp); 3455 int error; 3456 3457 /* 3458 * Set access flag. 3459 */ 3460 mtx_lock(&np->n_mtx); 3461 np->n_flag |= NACC; 3462 vfs_timestamp(&np->n_atim); 3463 mtx_unlock(&np->n_mtx); 3464 error = fifo_specops.vop_read(ap); 3465 return error; 3466 } 3467 3468 /* 3469 * Write wrapper for fifos. 3470 */ 3471 static int 3472 nfsfifo_write(struct vop_write_args *ap) 3473 { 3474 struct nfsnode *np = VTONFS(ap->a_vp); 3475 3476 /* 3477 * Set update flag. 3478 */ 3479 mtx_lock(&np->n_mtx); 3480 np->n_flag |= NUPD; 3481 vfs_timestamp(&np->n_mtim); 3482 mtx_unlock(&np->n_mtx); 3483 return(fifo_specops.vop_write(ap)); 3484 } 3485 3486 /* 3487 * Close wrapper for fifos. 3488 * 3489 * Update the times on the nfsnode then do fifo close. 3490 */ 3491 static int 3492 nfsfifo_close(struct vop_close_args *ap) 3493 { 3494 struct vnode *vp = ap->a_vp; 3495 struct nfsnode *np = VTONFS(vp); 3496 struct vattr vattr; 3497 struct timespec ts; 3498 3499 mtx_lock(&np->n_mtx); 3500 if (np->n_flag & (NACC | NUPD)) { 3501 vfs_timestamp(&ts); 3502 if (np->n_flag & NACC) 3503 np->n_atim = ts; 3504 if (np->n_flag & NUPD) 3505 np->n_mtim = ts; 3506 np->n_flag |= NCHG; 3507 if (vrefcnt(vp) == 1 && 3508 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3509 VATTR_NULL(&vattr); 3510 if (np->n_flag & NACC) 3511 vattr.va_atime = np->n_atim; 3512 if (np->n_flag & NUPD) 3513 vattr.va_mtime = np->n_mtim; 3514 mtx_unlock(&np->n_mtx); 3515 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3516 goto out; 3517 } 3518 } 3519 mtx_unlock(&np->n_mtx); 3520 out: 3521 return (fifo_specops.vop_close(ap)); 3522 } 3523 3524 /* 3525 * Just call nfs_writebp() with the force argument set to 1. 3526 * 3527 * NOTE: B_DONE may or may not be set in a_bp on call. 3528 */ 3529 static int 3530 nfs_bwrite(struct buf *bp) 3531 { 3532 3533 return (nfs_writebp(bp, 1, curthread)); 3534 } 3535 3536 struct buf_ops buf_ops_nfs = { 3537 .bop_name = "buf_ops_nfs", 3538 .bop_write = nfs_bwrite, 3539 .bop_strategy = bufstrategy, 3540 .bop_sync = bufsync, 3541 .bop_bdflush = bufbdflush, 3542 };
Cache object: c7f92c2a1384bb5c0c7c30fa3ed46577
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