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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("$FreeBSD$"); 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) != 0 && dattrflag) { 1185 /* 1186 * Cache the modification time of the parent 1187 * directory from the post-op attributes in 1188 * the name cache entry. The negative cache 1189 * entry will be ignored once the directory 1190 * has changed. Don't bother adding the entry 1191 * if the directory has already changed. 1192 */ 1193 mtx_lock(&np->n_mtx); 1194 if (timespeccmp(&np->n_vattr.va_mtime, 1195 &vattr.va_mtime, ==)) { 1196 mtx_unlock(&np->n_mtx); 1197 cache_enter_time(dvp, NULL, cnp, 1198 &vattr.va_mtime, NULL); 1199 } else 1200 mtx_unlock(&np->n_mtx); 1201 } 1202 return (ENOENT); 1203 } 1204 done: 1205 return (error); 1206 } 1207 1208 /* 1209 * nfs read call. 1210 * Just call nfs_bioread() to do the work. 1211 */ 1212 static int 1213 nfs_read(struct vop_read_args *ap) 1214 { 1215 struct vnode *vp = ap->a_vp; 1216 1217 switch (vp->v_type) { 1218 case VREG: 1219 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1220 case VDIR: 1221 return (EISDIR); 1222 default: 1223 return (EOPNOTSUPP); 1224 } 1225 } 1226 1227 /* 1228 * nfs readlink call 1229 */ 1230 static int 1231 nfs_readlink(struct vop_readlink_args *ap) 1232 { 1233 struct vnode *vp = ap->a_vp; 1234 1235 if (vp->v_type != VLNK) 1236 return (EINVAL); 1237 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1238 } 1239 1240 /* 1241 * Do a readlink rpc. 1242 * Called by nfs_doio() from below the buffer cache. 1243 */ 1244 int 1245 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1246 { 1247 caddr_t bpos, dpos; 1248 int error = 0, len, attrflag; 1249 struct mbuf *mreq, *mrep, *md, *mb; 1250 int v3 = NFS_ISV3(vp); 1251 1252 nfsstats.rpccnt[NFSPROC_READLINK]++; 1253 mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0); 1254 mb = mreq; 1255 bpos = mtod(mb, caddr_t); 1256 nfsm_fhtom(vp, v3); 1257 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1258 if (v3) 1259 nfsm_postop_attr(vp, attrflag); 1260 if (!error) { 1261 nfsm_strsiz(len, NFS_MAXPATHLEN); 1262 if (len == NFS_MAXPATHLEN) { 1263 struct nfsnode *np = VTONFS(vp); 1264 mtx_lock(&np->n_mtx); 1265 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1266 len = np->n_size; 1267 mtx_unlock(&np->n_mtx); 1268 } 1269 nfsm_mtouio(uiop, len); 1270 } 1271 m_freem(mrep); 1272 nfsmout: 1273 return (error); 1274 } 1275 1276 /* 1277 * nfs read rpc call 1278 * Ditto above 1279 */ 1280 int 1281 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1282 { 1283 u_int32_t *tl; 1284 caddr_t bpos, dpos; 1285 struct mbuf *mreq, *mrep, *md, *mb; 1286 struct nfsmount *nmp; 1287 off_t end; 1288 int error = 0, len, retlen, tsiz, eof, attrflag; 1289 int v3 = NFS_ISV3(vp); 1290 int rsize; 1291 1292 #ifndef nolint 1293 eof = 0; 1294 #endif 1295 nmp = VFSTONFS(vp->v_mount); 1296 tsiz = uiop->uio_resid; 1297 mtx_lock(&nmp->nm_mtx); 1298 end = uiop->uio_offset + tsiz; 1299 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { 1300 mtx_unlock(&nmp->nm_mtx); 1301 return (EFBIG); 1302 } 1303 rsize = nmp->nm_rsize; 1304 mtx_unlock(&nmp->nm_mtx); 1305 while (tsiz > 0) { 1306 nfsstats.rpccnt[NFSPROC_READ]++; 1307 len = (tsiz > rsize) ? rsize : tsiz; 1308 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED * 3, M_WAITOK, 1309 MT_DATA, 0); 1310 mb = mreq; 1311 bpos = mtod(mb, caddr_t); 1312 nfsm_fhtom(vp, v3); 1313 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1314 if (v3) { 1315 txdr_hyper(uiop->uio_offset, tl); 1316 *(tl + 2) = txdr_unsigned(len); 1317 } else { 1318 *tl++ = txdr_unsigned(uiop->uio_offset); 1319 *tl++ = txdr_unsigned(len); 1320 *tl = 0; 1321 } 1322 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1323 if (v3) { 1324 nfsm_postop_attr(vp, attrflag); 1325 if (error) { 1326 m_freem(mrep); 1327 goto nfsmout; 1328 } 1329 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1330 eof = fxdr_unsigned(int, *(tl + 1)); 1331 } else { 1332 nfsm_loadattr(vp, NULL); 1333 } 1334 nfsm_strsiz(retlen, rsize); 1335 nfsm_mtouio(uiop, retlen); 1336 m_freem(mrep); 1337 tsiz -= retlen; 1338 if (v3) { 1339 if (eof || retlen == 0) { 1340 tsiz = 0; 1341 } 1342 } else if (retlen < len) { 1343 tsiz = 0; 1344 } 1345 } 1346 nfsmout: 1347 return (error); 1348 } 1349 1350 /* 1351 * nfs write call 1352 */ 1353 int 1354 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1355 int *iomode, int *must_commit) 1356 { 1357 u_int32_t *tl; 1358 int32_t backup; 1359 caddr_t bpos, dpos; 1360 struct mbuf *mreq, *mrep, *md, *mb; 1361 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1362 off_t end; 1363 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1364 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1365 int wsize; 1366 1367 KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1")); 1368 *must_commit = 0; 1369 tsiz = uiop->uio_resid; 1370 mtx_lock(&nmp->nm_mtx); 1371 end = uiop->uio_offset + tsiz; 1372 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { 1373 mtx_unlock(&nmp->nm_mtx); 1374 return (EFBIG); 1375 } 1376 wsize = nmp->nm_wsize; 1377 mtx_unlock(&nmp->nm_mtx); 1378 while (tsiz > 0) { 1379 nfsstats.rpccnt[NFSPROC_WRITE]++; 1380 len = (tsiz > wsize) ? wsize : tsiz; 1381 mreq = m_get2(NFSX_FH(v3) + 5 * NFSX_UNSIGNED, M_WAITOK, 1382 MT_DATA, 0); 1383 mb = mreq; 1384 bpos = mtod(mb, caddr_t); 1385 nfsm_fhtom(vp, v3); 1386 if (v3) { 1387 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1388 txdr_hyper(uiop->uio_offset, tl); 1389 tl += 2; 1390 *tl++ = txdr_unsigned(len); 1391 *tl++ = txdr_unsigned(*iomode); 1392 *tl = txdr_unsigned(len); 1393 } else { 1394 u_int32_t x; 1395 1396 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1397 /* Set both "begin" and "current" to non-garbage. */ 1398 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1399 *tl++ = x; /* "begin offset" */ 1400 *tl++ = x; /* "current offset" */ 1401 x = txdr_unsigned(len); 1402 *tl++ = x; /* total to this offset */ 1403 *tl = x; /* size of this write */ 1404 } 1405 nfsm_uiotom(uiop, len); 1406 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1407 if (v3) { 1408 wccflag = NFSV3_WCCCHK; 1409 nfsm_wcc_data(vp, wccflag); 1410 if (!error) { 1411 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1412 + NFSX_V3WRITEVERF); 1413 rlen = fxdr_unsigned(int, *tl++); 1414 if (rlen == 0) { 1415 error = NFSERR_IO; 1416 m_freem(mrep); 1417 break; 1418 } else if (rlen < len) { 1419 backup = len - rlen; 1420 uiop->uio_iov->iov_base = 1421 (char *)uiop->uio_iov->iov_base - 1422 backup; 1423 uiop->uio_iov->iov_len += backup; 1424 uiop->uio_offset -= backup; 1425 uiop->uio_resid += backup; 1426 len = rlen; 1427 } 1428 commit = fxdr_unsigned(int, *tl++); 1429 1430 /* 1431 * Return the lowest committment level 1432 * obtained by any of the RPCs. 1433 */ 1434 if (committed == NFSV3WRITE_FILESYNC) 1435 committed = commit; 1436 else if (committed == NFSV3WRITE_DATASYNC && 1437 commit == NFSV3WRITE_UNSTABLE) 1438 committed = commit; 1439 mtx_lock(&nmp->nm_mtx); 1440 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1441 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1442 NFSX_V3WRITEVERF); 1443 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1444 } else if (bcmp((caddr_t)tl, 1445 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1446 *must_commit = 1; 1447 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1448 NFSX_V3WRITEVERF); 1449 } 1450 mtx_unlock(&nmp->nm_mtx); 1451 } 1452 } else { 1453 nfsm_loadattr(vp, NULL); 1454 } 1455 if (wccflag) { 1456 mtx_lock(&(VTONFS(vp))->n_mtx); 1457 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1458 mtx_unlock(&(VTONFS(vp))->n_mtx); 1459 } 1460 m_freem(mrep); 1461 if (error) 1462 break; 1463 tsiz -= len; 1464 } 1465 nfsmout: 1466 if (DOINGASYNC(vp)) 1467 committed = NFSV3WRITE_FILESYNC; 1468 *iomode = committed; 1469 if (error) 1470 uiop->uio_resid = tsiz; 1471 return (error); 1472 } 1473 1474 /* 1475 * nfs mknod rpc 1476 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1477 * mode set to specify the file type and the size field for rdev. 1478 */ 1479 static int 1480 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1481 struct vattr *vap) 1482 { 1483 struct nfsv2_sattr *sp; 1484 u_int32_t *tl; 1485 struct vnode *newvp = NULL; 1486 struct nfsnode *np = NULL; 1487 struct vattr vattr; 1488 caddr_t bpos, dpos; 1489 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1490 struct mbuf *mreq, *mrep, *md, *mb; 1491 u_int32_t rdev; 1492 int v3 = NFS_ISV3(dvp); 1493 1494 if (vap->va_type == VCHR || vap->va_type == VBLK) 1495 rdev = txdr_unsigned(vap->va_rdev); 1496 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1497 rdev = nfs_xdrneg1; 1498 else { 1499 return (EOPNOTSUPP); 1500 } 1501 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 1502 return (error); 1503 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1504 mreq = m_get2(NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1505 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 1506 mb = mreq; 1507 bpos = mtod(mb, caddr_t); 1508 nfsm_fhtom(dvp, v3); 1509 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1510 if (v3) { 1511 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1512 *tl++ = vtonfsv3_type(vap->va_type); 1513 nfsm_v3attrbuild(vap, FALSE); 1514 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1515 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1516 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1517 *tl = txdr_unsigned(minor(vap->va_rdev)); 1518 } 1519 } else { 1520 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1521 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1522 sp->sa_uid = nfs_xdrneg1; 1523 sp->sa_gid = nfs_xdrneg1; 1524 sp->sa_size = rdev; 1525 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1526 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1527 } 1528 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1529 if (!error) { 1530 nfsm_mtofh(dvp, newvp, v3, gotvp); 1531 if (!gotvp) { 1532 if (newvp) { 1533 vput(newvp); 1534 newvp = NULL; 1535 } 1536 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1537 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1538 if (!error) 1539 newvp = NFSTOV(np); 1540 } 1541 } 1542 if (v3) 1543 nfsm_wcc_data(dvp, wccflag); 1544 m_freem(mrep); 1545 nfsmout: 1546 if (error) { 1547 if (newvp) 1548 vput(newvp); 1549 } else { 1550 *vpp = newvp; 1551 } 1552 mtx_lock(&(VTONFS(dvp))->n_mtx); 1553 VTONFS(dvp)->n_flag |= NMODIFIED; 1554 if (!wccflag) { 1555 VTONFS(dvp)->n_attrstamp = 0; 1556 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1557 } 1558 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1559 return (error); 1560 } 1561 1562 /* 1563 * nfs mknod vop 1564 * just call nfs_mknodrpc() to do the work. 1565 */ 1566 /* ARGSUSED */ 1567 static int 1568 nfs_mknod(struct vop_mknod_args *ap) 1569 { 1570 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1571 } 1572 1573 static u_long create_verf; 1574 /* 1575 * nfs file create call 1576 */ 1577 static int 1578 nfs_create(struct vop_create_args *ap) 1579 { 1580 struct vnode *dvp = ap->a_dvp; 1581 struct vattr *vap = ap->a_vap; 1582 struct componentname *cnp = ap->a_cnp; 1583 struct nfsv2_sattr *sp; 1584 u_int32_t *tl; 1585 struct nfsnode *np = NULL; 1586 struct vnode *newvp = NULL; 1587 caddr_t bpos, dpos; 1588 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1589 struct mbuf *mreq, *mrep, *md, *mb; 1590 struct vattr vattr; 1591 int v3 = NFS_ISV3(dvp); 1592 1593 /* 1594 * Oops, not for me.. 1595 */ 1596 if (vap->va_type == VSOCK) { 1597 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); 1598 return (error); 1599 } 1600 1601 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) { 1602 return (error); 1603 } 1604 if (vap->va_vaflags & VA_EXCLUSIVE) 1605 fmode |= O_EXCL; 1606 again: 1607 nfsstats.rpccnt[NFSPROC_CREATE]++; 1608 mreq = m_get2(NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1609 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 1610 mb = mreq; 1611 bpos = mtod(mb, caddr_t); 1612 nfsm_fhtom(dvp, v3); 1613 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1614 if (v3) { 1615 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1616 if (fmode & O_EXCL) { 1617 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1618 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1619 #ifdef INET 1620 CURVNET_SET(CRED_TO_VNET(cnp->cn_cred)); 1621 IN_IFADDR_RLOCK(); 1622 if (!TAILQ_EMPTY(&V_in_ifaddrhead)) 1623 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr; 1624 else 1625 #endif 1626 *tl++ = create_verf; 1627 #ifdef INET 1628 IN_IFADDR_RUNLOCK(); 1629 CURVNET_RESTORE(); 1630 #endif 1631 *tl = ++create_verf; 1632 } else { 1633 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1634 nfsm_v3attrbuild(vap, FALSE); 1635 } 1636 } else { 1637 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1638 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1639 sp->sa_uid = nfs_xdrneg1; 1640 sp->sa_gid = nfs_xdrneg1; 1641 sp->sa_size = 0; 1642 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1643 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1644 } 1645 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1646 if (!error) { 1647 nfsm_mtofh(dvp, newvp, v3, gotvp); 1648 if (!gotvp) { 1649 if (newvp) { 1650 vput(newvp); 1651 newvp = NULL; 1652 } 1653 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1654 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1655 if (!error) 1656 newvp = NFSTOV(np); 1657 } 1658 } 1659 if (v3) 1660 nfsm_wcc_data(dvp, wccflag); 1661 m_freem(mrep); 1662 nfsmout: 1663 if (error) { 1664 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1665 fmode &= ~O_EXCL; 1666 goto again; 1667 } 1668 if (newvp) 1669 vput(newvp); 1670 } else if (v3 && (fmode & O_EXCL)) { 1671 /* 1672 * We are normally called with only a partially initialized 1673 * VAP. Since the NFSv3 spec says that server may use the 1674 * file attributes to store the verifier, the spec requires 1675 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1676 * in atime, but we can't really assume that all servers will 1677 * so we ensure that our SETATTR sets both atime and mtime. 1678 */ 1679 if (vap->va_mtime.tv_sec == VNOVAL) 1680 vfs_timestamp(&vap->va_mtime); 1681 if (vap->va_atime.tv_sec == VNOVAL) 1682 vap->va_atime = vap->va_mtime; 1683 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred); 1684 if (error) 1685 vput(newvp); 1686 } 1687 if (!error) { 1688 *ap->a_vpp = newvp; 1689 } 1690 mtx_lock(&(VTONFS(dvp))->n_mtx); 1691 VTONFS(dvp)->n_flag |= NMODIFIED; 1692 if (!wccflag) { 1693 VTONFS(dvp)->n_attrstamp = 0; 1694 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1695 } 1696 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1697 return (error); 1698 } 1699 1700 /* 1701 * nfs file remove call 1702 * To try and make nfs semantics closer to ufs semantics, a file that has 1703 * other processes using the vnode is renamed instead of removed and then 1704 * removed later on the last close. 1705 * - If v_usecount > 1 1706 * If a rename is not already in the works 1707 * call nfs_sillyrename() to set it up 1708 * else 1709 * do the remove rpc 1710 */ 1711 static int 1712 nfs_remove(struct vop_remove_args *ap) 1713 { 1714 struct vnode *vp = ap->a_vp; 1715 struct vnode *dvp = ap->a_dvp; 1716 struct componentname *cnp = ap->a_cnp; 1717 struct nfsnode *np = VTONFS(vp); 1718 int error = 0; 1719 struct vattr vattr; 1720 1721 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1722 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1723 if (vp->v_type == VDIR) 1724 error = EPERM; 1725 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1726 !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) { 1727 /* 1728 * Purge the name cache so that the chance of a lookup for 1729 * the name succeeding while the remove is in progress is 1730 * minimized. Without node locking it can still happen, such 1731 * that an I/O op returns ESTALE, but since you get this if 1732 * another host removes the file.. 1733 */ 1734 cache_purge(vp); 1735 /* 1736 * throw away biocache buffers, mainly to avoid 1737 * unnecessary delayed writes later. 1738 */ 1739 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1740 /* Do the rpc */ 1741 if (error != EINTR && error != EIO) 1742 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1743 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1744 /* 1745 * Kludge City: If the first reply to the remove rpc is lost.. 1746 * the reply to the retransmitted request will be ENOENT 1747 * since the file was in fact removed 1748 * Therefore, we cheat and return success. 1749 */ 1750 if (error == ENOENT) 1751 error = 0; 1752 } else if (!np->n_sillyrename) 1753 error = nfs_sillyrename(dvp, vp, cnp); 1754 mtx_lock(&np->n_mtx); 1755 np->n_attrstamp = 0; 1756 mtx_unlock(&np->n_mtx); 1757 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1758 return (error); 1759 } 1760 1761 /* 1762 * nfs file remove rpc called from nfs_inactive 1763 */ 1764 int 1765 nfs_removeit(struct sillyrename *sp) 1766 { 1767 /* 1768 * Make sure that the directory vnode is still valid. 1769 * XXX we should lock sp->s_dvp here. 1770 */ 1771 if (sp->s_dvp->v_type == VBAD) 1772 return (0); 1773 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1774 NULL)); 1775 } 1776 1777 /* 1778 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1779 */ 1780 static int 1781 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1782 struct ucred *cred, struct thread *td) 1783 { 1784 caddr_t bpos, dpos; 1785 int error = 0, wccflag = NFSV3_WCCRATTR; 1786 struct mbuf *mreq, *mrep, *md, *mb; 1787 int v3 = NFS_ISV3(dvp); 1788 1789 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1790 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen), 1791 M_WAITOK, MT_DATA, 0); 1792 mb = mreq; 1793 bpos = mtod(mb, caddr_t); 1794 nfsm_fhtom(dvp, v3); 1795 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1796 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1797 if (v3) 1798 nfsm_wcc_data(dvp, wccflag); 1799 m_freem(mrep); 1800 nfsmout: 1801 mtx_lock(&(VTONFS(dvp))->n_mtx); 1802 VTONFS(dvp)->n_flag |= NMODIFIED; 1803 if (!wccflag) { 1804 VTONFS(dvp)->n_attrstamp = 0; 1805 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1806 } 1807 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1808 return (error); 1809 } 1810 1811 /* 1812 * nfs file rename call 1813 */ 1814 static int 1815 nfs_rename(struct vop_rename_args *ap) 1816 { 1817 struct vnode *fvp = ap->a_fvp; 1818 struct vnode *tvp = ap->a_tvp; 1819 struct vnode *fdvp = ap->a_fdvp; 1820 struct vnode *tdvp = ap->a_tdvp; 1821 struct componentname *tcnp = ap->a_tcnp; 1822 struct componentname *fcnp = ap->a_fcnp; 1823 int error; 1824 1825 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1826 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1827 /* Check for cross-device rename */ 1828 if ((fvp->v_mount != tdvp->v_mount) || 1829 (tvp && (fvp->v_mount != tvp->v_mount))) { 1830 error = EXDEV; 1831 goto out; 1832 } 1833 1834 if (fvp == tvp) { 1835 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1836 error = 0; 1837 goto out; 1838 } 1839 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 1840 goto out; 1841 1842 /* 1843 * We have to flush B_DELWRI data prior to renaming 1844 * the file. If we don't, the delayed-write buffers 1845 * can be flushed out later after the file has gone stale 1846 * under NFSV3. NFSV2 does not have this problem because 1847 * ( as far as I can tell ) it flushes dirty buffers more 1848 * often. 1849 * 1850 * Skip the rename operation if the fsync fails, this can happen 1851 * due to the server's volume being full, when we pushed out data 1852 * that was written back to our cache earlier. Not checking for 1853 * this condition can result in potential (silent) data loss. 1854 */ 1855 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1856 VOP_UNLOCK(fvp, 0); 1857 if (!error && tvp) 1858 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1859 if (error) 1860 goto out; 1861 1862 /* 1863 * If the tvp exists and is in use, sillyrename it before doing the 1864 * rename of the new file over it. 1865 * XXX Can't sillyrename a directory. 1866 */ 1867 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1868 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1869 vput(tvp); 1870 tvp = NULL; 1871 } 1872 1873 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1874 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1875 tcnp->cn_thread); 1876 1877 if (fvp->v_type == VDIR) { 1878 if (tvp != NULL && tvp->v_type == VDIR) 1879 cache_purge(tdvp); 1880 cache_purge(fdvp); 1881 } 1882 1883 out: 1884 if (tdvp == tvp) 1885 vrele(tdvp); 1886 else 1887 vput(tdvp); 1888 if (tvp) 1889 vput(tvp); 1890 vrele(fdvp); 1891 vrele(fvp); 1892 /* 1893 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1894 */ 1895 if (error == ENOENT) 1896 error = 0; 1897 return (error); 1898 } 1899 1900 /* 1901 * nfs file rename rpc called from nfs_remove() above 1902 */ 1903 static int 1904 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1905 struct sillyrename *sp) 1906 { 1907 1908 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1909 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1910 } 1911 1912 /* 1913 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1914 */ 1915 static int 1916 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1917 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1918 struct thread *td) 1919 { 1920 caddr_t bpos, dpos; 1921 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1922 struct mbuf *mreq, *mrep, *md, *mb; 1923 int v3 = NFS_ISV3(fdvp); 1924 1925 nfsstats.rpccnt[NFSPROC_RENAME]++; 1926 mreq = m_get2((NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1927 nfsm_rndup(tnamelen), M_WAITOK, MT_DATA, 0); 1928 mb = mreq; 1929 bpos = mtod(mb, caddr_t); 1930 nfsm_fhtom(fdvp, v3); 1931 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1932 nfsm_fhtom(tdvp, v3); 1933 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1934 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1935 if (v3) { 1936 nfsm_wcc_data(fdvp, fwccflag); 1937 nfsm_wcc_data(tdvp, twccflag); 1938 } 1939 m_freem(mrep); 1940 nfsmout: 1941 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1942 VTONFS(fdvp)->n_flag |= NMODIFIED; 1943 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1944 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1945 VTONFS(tdvp)->n_flag |= NMODIFIED; 1946 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1947 if (!fwccflag) { 1948 VTONFS(fdvp)->n_attrstamp = 0; 1949 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1950 } 1951 if (!twccflag) { 1952 VTONFS(tdvp)->n_attrstamp = 0; 1953 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1954 } 1955 return (error); 1956 } 1957 1958 /* 1959 * nfs hard link create call 1960 */ 1961 static int 1962 nfs_link(struct vop_link_args *ap) 1963 { 1964 struct vnode *vp = ap->a_vp; 1965 struct vnode *tdvp = ap->a_tdvp; 1966 struct componentname *cnp = ap->a_cnp; 1967 caddr_t bpos, dpos; 1968 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1969 struct mbuf *mreq, *mrep, *md, *mb; 1970 int v3; 1971 1972 if (vp->v_mount != tdvp->v_mount) { 1973 return (EXDEV); 1974 } 1975 1976 /* 1977 * Push all writes to the server, so that the attribute cache 1978 * doesn't get "out of sync" with the server. 1979 * XXX There should be a better way! 1980 */ 1981 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1982 1983 v3 = NFS_ISV3(vp); 1984 nfsstats.rpccnt[NFSPROC_LINK]++; 1985 mreq = m_get2(NFSX_FH(v3)*2 + NFSX_UNSIGNED + 1986 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0); 1987 mb = mreq; 1988 bpos = mtod(mb, caddr_t); 1989 nfsm_fhtom(vp, v3); 1990 nfsm_fhtom(tdvp, v3); 1991 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1992 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1993 if (v3) { 1994 nfsm_postop_attr(vp, attrflag); 1995 nfsm_wcc_data(tdvp, wccflag); 1996 } 1997 m_freem(mrep); 1998 nfsmout: 1999 mtx_lock(&(VTONFS(tdvp))->n_mtx); 2000 VTONFS(tdvp)->n_flag |= NMODIFIED; 2001 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 2002 if (!attrflag) { 2003 VTONFS(vp)->n_attrstamp = 0; 2004 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2005 } 2006 if (!wccflag) { 2007 VTONFS(tdvp)->n_attrstamp = 0; 2008 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2009 } 2010 return (error); 2011 } 2012 2013 /* 2014 * nfs symbolic link create call 2015 */ 2016 static int 2017 nfs_symlink(struct vop_symlink_args *ap) 2018 { 2019 struct vnode *dvp = ap->a_dvp; 2020 struct vattr *vap = ap->a_vap; 2021 struct componentname *cnp = ap->a_cnp; 2022 struct nfsv2_sattr *sp; 2023 caddr_t bpos, dpos; 2024 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2025 struct mbuf *mreq, *mrep, *md, *mb; 2026 struct vnode *newvp = NULL; 2027 int v3 = NFS_ISV3(dvp); 2028 2029 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2030 slen = strlen(ap->a_target); 2031 mreq = m_get2(NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2032 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3), 2033 M_WAITOK, MT_DATA, 0); 2034 mb = mreq; 2035 bpos = mtod(mb, caddr_t); 2036 nfsm_fhtom(dvp, v3); 2037 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2038 if (v3) { 2039 nfsm_v3attrbuild(vap, FALSE); 2040 } 2041 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2042 if (!v3) { 2043 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2044 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2045 sp->sa_uid = nfs_xdrneg1; 2046 sp->sa_gid = nfs_xdrneg1; 2047 sp->sa_size = nfs_xdrneg1; 2048 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2049 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2050 } 2051 2052 /* 2053 * Issue the NFS request and get the rpc response. 2054 * 2055 * Only NFSv3 responses returning an error of 0 actually return 2056 * a file handle that can be converted into newvp without having 2057 * to do an extra lookup rpc. 2058 */ 2059 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 2060 if (v3) { 2061 if (error == 0) 2062 nfsm_mtofh(dvp, newvp, v3, gotvp); 2063 nfsm_wcc_data(dvp, wccflag); 2064 } 2065 2066 /* 2067 * out code jumps -> here, mrep is also freed. 2068 */ 2069 2070 m_freem(mrep); 2071 nfsmout: 2072 2073 /* 2074 * If we do not have an error and we could not extract the newvp from 2075 * the response due to the request being NFSv2, we have to do a 2076 * lookup in order to obtain a newvp to return. 2077 */ 2078 if (error == 0 && newvp == NULL) { 2079 struct nfsnode *np = NULL; 2080 2081 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2082 cnp->cn_cred, cnp->cn_thread, &np); 2083 if (!error) 2084 newvp = NFSTOV(np); 2085 } 2086 if (error) { 2087 if (newvp) 2088 vput(newvp); 2089 } else { 2090 *ap->a_vpp = newvp; 2091 } 2092 mtx_lock(&(VTONFS(dvp))->n_mtx); 2093 VTONFS(dvp)->n_flag |= NMODIFIED; 2094 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2095 if (!wccflag) { 2096 VTONFS(dvp)->n_attrstamp = 0; 2097 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2098 } 2099 return (error); 2100 } 2101 2102 /* 2103 * nfs make dir call 2104 */ 2105 static int 2106 nfs_mkdir(struct vop_mkdir_args *ap) 2107 { 2108 struct vnode *dvp = ap->a_dvp; 2109 struct vattr *vap = ap->a_vap; 2110 struct componentname *cnp = ap->a_cnp; 2111 struct nfsv2_sattr *sp; 2112 int len; 2113 struct nfsnode *np = NULL; 2114 struct vnode *newvp = NULL; 2115 caddr_t bpos, dpos; 2116 int error = 0, wccflag = NFSV3_WCCRATTR; 2117 int gotvp = 0; 2118 struct mbuf *mreq, *mrep, *md, *mb; 2119 struct vattr vattr; 2120 int v3 = NFS_ISV3(dvp); 2121 2122 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2123 return (error); 2124 len = cnp->cn_namelen; 2125 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2126 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + 2127 NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0); 2128 mb = mreq; 2129 bpos = mtod(mb, caddr_t); 2130 nfsm_fhtom(dvp, v3); 2131 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2132 if (v3) { 2133 nfsm_v3attrbuild(vap, FALSE); 2134 } else { 2135 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2136 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2137 sp->sa_uid = nfs_xdrneg1; 2138 sp->sa_gid = nfs_xdrneg1; 2139 sp->sa_size = nfs_xdrneg1; 2140 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2141 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2142 } 2143 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2144 if (!error) 2145 nfsm_mtofh(dvp, newvp, v3, gotvp); 2146 if (v3) 2147 nfsm_wcc_data(dvp, wccflag); 2148 m_freem(mrep); 2149 nfsmout: 2150 mtx_lock(&(VTONFS(dvp))->n_mtx); 2151 VTONFS(dvp)->n_flag |= NMODIFIED; 2152 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2153 if (!wccflag) { 2154 VTONFS(dvp)->n_attrstamp = 0; 2155 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2156 } 2157 if (error == 0 && newvp == NULL) { 2158 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2159 cnp->cn_thread, &np); 2160 if (!error) { 2161 newvp = NFSTOV(np); 2162 if (newvp->v_type != VDIR) 2163 error = EEXIST; 2164 } 2165 } 2166 if (error) { 2167 if (newvp) 2168 vput(newvp); 2169 } else 2170 *ap->a_vpp = newvp; 2171 return (error); 2172 } 2173 2174 /* 2175 * nfs remove directory call 2176 */ 2177 static int 2178 nfs_rmdir(struct vop_rmdir_args *ap) 2179 { 2180 struct vnode *vp = ap->a_vp; 2181 struct vnode *dvp = ap->a_dvp; 2182 struct componentname *cnp = ap->a_cnp; 2183 caddr_t bpos, dpos; 2184 int error = 0, wccflag = NFSV3_WCCRATTR; 2185 struct mbuf *mreq, *mrep, *md, *mb; 2186 int v3 = NFS_ISV3(dvp); 2187 2188 if (dvp == vp) 2189 return (EINVAL); 2190 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2191 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + 2192 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0); 2193 mb = mreq; 2194 bpos = mtod(mb, caddr_t); 2195 nfsm_fhtom(dvp, v3); 2196 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2197 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2198 if (v3) 2199 nfsm_wcc_data(dvp, wccflag); 2200 m_freem(mrep); 2201 nfsmout: 2202 mtx_lock(&(VTONFS(dvp))->n_mtx); 2203 VTONFS(dvp)->n_flag |= NMODIFIED; 2204 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2205 if (!wccflag) { 2206 VTONFS(dvp)->n_attrstamp = 0; 2207 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2208 } 2209 cache_purge(dvp); 2210 cache_purge(vp); 2211 /* 2212 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2213 */ 2214 if (error == ENOENT) 2215 error = 0; 2216 return (error); 2217 } 2218 2219 /* 2220 * nfs readdir call 2221 */ 2222 static int 2223 nfs_readdir(struct vop_readdir_args *ap) 2224 { 2225 struct vnode *vp = ap->a_vp; 2226 struct nfsnode *np = VTONFS(vp); 2227 struct uio *uio = ap->a_uio; 2228 int tresid, error = 0; 2229 struct vattr vattr; 2230 2231 if (vp->v_type != VDIR) 2232 return(EPERM); 2233 2234 /* 2235 * First, check for hit on the EOF offset cache 2236 */ 2237 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2238 (np->n_flag & NMODIFIED) == 0) { 2239 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2240 mtx_lock(&np->n_mtx); 2241 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2242 mtx_unlock(&np->n_mtx); 2243 nfsstats.direofcache_hits++; 2244 goto out; 2245 } else 2246 mtx_unlock(&np->n_mtx); 2247 } 2248 } 2249 2250 /* 2251 * Call nfs_bioread() to do the real work. 2252 */ 2253 tresid = uio->uio_resid; 2254 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2255 2256 if (!error && uio->uio_resid == tresid) { 2257 nfsstats.direofcache_misses++; 2258 } 2259 out: 2260 return (error); 2261 } 2262 2263 /* 2264 * Readdir rpc call. 2265 * Called from below the buffer cache by nfs_doio(). 2266 */ 2267 int 2268 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2269 { 2270 int len, left; 2271 struct dirent *dp = NULL; 2272 u_int32_t *tl; 2273 caddr_t cp; 2274 nfsuint64 *cookiep; 2275 caddr_t bpos, dpos; 2276 struct mbuf *mreq, *mrep, *md, *mb; 2277 nfsuint64 cookie; 2278 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2279 struct nfsnode *dnp = VTONFS(vp); 2280 u_quad_t fileno; 2281 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2282 int attrflag; 2283 int v3 = NFS_ISV3(vp); 2284 2285 KASSERT(uiop->uio_iovcnt == 1 && 2286 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2287 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2288 ("nfs readdirrpc bad uio")); 2289 2290 /* 2291 * If there is no cookie, assume directory was stale. 2292 */ 2293 nfs_dircookie_lock(dnp); 2294 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2295 if (cookiep) { 2296 cookie = *cookiep; 2297 nfs_dircookie_unlock(dnp); 2298 } else { 2299 nfs_dircookie_unlock(dnp); 2300 return (NFSERR_BAD_COOKIE); 2301 } 2302 2303 /* 2304 * Loop around doing readdir rpc's of size nm_readdirsize 2305 * truncated to a multiple of DIRBLKSIZ. 2306 * The stopping criteria is EOF or buffer full. 2307 */ 2308 while (more_dirs && bigenough) { 2309 nfsstats.rpccnt[NFSPROC_READDIR]++; 2310 mreq = m_get2(NFSX_FH(v3) + NFSX_READDIR(v3), M_WAITOK, 2311 MT_DATA, 0); 2312 mb = mreq; 2313 bpos = mtod(mb, caddr_t); 2314 nfsm_fhtom(vp, v3); 2315 if (v3) { 2316 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2317 *tl++ = cookie.nfsuquad[0]; 2318 *tl++ = cookie.nfsuquad[1]; 2319 mtx_lock(&dnp->n_mtx); 2320 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2321 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2322 mtx_unlock(&dnp->n_mtx); 2323 } else { 2324 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2325 *tl++ = cookie.nfsuquad[0]; 2326 } 2327 *tl = txdr_unsigned(nmp->nm_readdirsize); 2328 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2329 if (v3) { 2330 nfsm_postop_attr(vp, attrflag); 2331 if (!error) { 2332 tl = nfsm_dissect(u_int32_t *, 2333 2 * NFSX_UNSIGNED); 2334 mtx_lock(&dnp->n_mtx); 2335 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2336 dnp->n_cookieverf.nfsuquad[1] = *tl; 2337 mtx_unlock(&dnp->n_mtx); 2338 } else { 2339 m_freem(mrep); 2340 goto nfsmout; 2341 } 2342 } 2343 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2344 more_dirs = fxdr_unsigned(int, *tl); 2345 2346 /* loop thru the dir entries, doctoring them to 4bsd form */ 2347 while (more_dirs && bigenough) { 2348 if (v3) { 2349 tl = nfsm_dissect(u_int32_t *, 2350 3 * NFSX_UNSIGNED); 2351 fileno = fxdr_hyper(tl); 2352 len = fxdr_unsigned(int, *(tl + 2)); 2353 } else { 2354 tl = nfsm_dissect(u_int32_t *, 2355 2 * NFSX_UNSIGNED); 2356 fileno = fxdr_unsigned(u_quad_t, *tl++); 2357 len = fxdr_unsigned(int, *tl); 2358 } 2359 if (len <= 0 || len > NFS_MAXNAMLEN) { 2360 error = EBADRPC; 2361 m_freem(mrep); 2362 goto nfsmout; 2363 } 2364 tlen = nfsm_rndup(len); 2365 if (tlen == len) 2366 tlen += 4; /* To ensure null termination */ 2367 left = DIRBLKSIZ - blksiz; 2368 if ((tlen + DIRHDSIZ) > left) { 2369 dp->d_reclen += left; 2370 uiop->uio_iov->iov_base = 2371 (char *)uiop->uio_iov->iov_base + left; 2372 uiop->uio_iov->iov_len -= left; 2373 uiop->uio_offset += left; 2374 uiop->uio_resid -= left; 2375 blksiz = 0; 2376 } 2377 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2378 bigenough = 0; 2379 if (bigenough) { 2380 dp = (struct dirent *)uiop->uio_iov->iov_base; 2381 dp->d_fileno = (int)fileno; 2382 dp->d_namlen = len; 2383 dp->d_reclen = tlen + DIRHDSIZ; 2384 dp->d_type = DT_UNKNOWN; 2385 blksiz += dp->d_reclen; 2386 if (blksiz == DIRBLKSIZ) 2387 blksiz = 0; 2388 uiop->uio_offset += DIRHDSIZ; 2389 uiop->uio_resid -= DIRHDSIZ; 2390 uiop->uio_iov->iov_base = 2391 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2392 uiop->uio_iov->iov_len -= DIRHDSIZ; 2393 nfsm_mtouio(uiop, len); 2394 cp = uiop->uio_iov->iov_base; 2395 tlen -= len; 2396 *cp = '\0'; /* null terminate */ 2397 uiop->uio_iov->iov_base = 2398 (char *)uiop->uio_iov->iov_base + tlen; 2399 uiop->uio_iov->iov_len -= tlen; 2400 uiop->uio_offset += tlen; 2401 uiop->uio_resid -= tlen; 2402 } else 2403 nfsm_adv(nfsm_rndup(len)); 2404 if (v3) { 2405 tl = nfsm_dissect(u_int32_t *, 2406 3 * NFSX_UNSIGNED); 2407 } else { 2408 tl = nfsm_dissect(u_int32_t *, 2409 2 * NFSX_UNSIGNED); 2410 } 2411 if (bigenough) { 2412 cookie.nfsuquad[0] = *tl++; 2413 if (v3) 2414 cookie.nfsuquad[1] = *tl++; 2415 } else if (v3) 2416 tl += 2; 2417 else 2418 tl++; 2419 more_dirs = fxdr_unsigned(int, *tl); 2420 } 2421 /* 2422 * If at end of rpc data, get the eof boolean 2423 */ 2424 if (!more_dirs) { 2425 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2426 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2427 } 2428 m_freem(mrep); 2429 } 2430 /* 2431 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2432 * by increasing d_reclen for the last record. 2433 */ 2434 if (blksiz > 0) { 2435 left = DIRBLKSIZ - blksiz; 2436 dp->d_reclen += left; 2437 uiop->uio_iov->iov_base = 2438 (char *)uiop->uio_iov->iov_base + left; 2439 uiop->uio_iov->iov_len -= left; 2440 uiop->uio_offset += left; 2441 uiop->uio_resid -= left; 2442 } 2443 2444 /* 2445 * We are now either at the end of the directory or have filled the 2446 * block. 2447 */ 2448 if (bigenough) 2449 dnp->n_direofoffset = uiop->uio_offset; 2450 else { 2451 if (uiop->uio_resid > 0) 2452 nfs_printf("EEK! readdirrpc resid > 0\n"); 2453 nfs_dircookie_lock(dnp); 2454 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2455 *cookiep = cookie; 2456 nfs_dircookie_unlock(dnp); 2457 } 2458 nfsmout: 2459 return (error); 2460 } 2461 2462 /* 2463 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2464 */ 2465 int 2466 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2467 { 2468 int len, left; 2469 struct dirent *dp; 2470 u_int32_t *tl; 2471 caddr_t cp; 2472 struct vnode *newvp; 2473 nfsuint64 *cookiep; 2474 caddr_t bpos, dpos, dpossav1, dpossav2; 2475 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2476 struct nameidata nami, *ndp = &nami; 2477 struct componentname *cnp = &ndp->ni_cnd; 2478 nfsuint64 cookie; 2479 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2480 struct nfsnode *dnp = VTONFS(vp), *np; 2481 struct vattr vattr, dvattr; 2482 nfsfh_t *fhp; 2483 u_quad_t fileno; 2484 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2485 int attrflag, dattrflag, fhsize; 2486 2487 #ifndef nolint 2488 dp = NULL; 2489 #endif 2490 KASSERT(uiop->uio_iovcnt == 1 && 2491 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2492 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2493 ("nfs readdirplusrpc bad uio")); 2494 ndp->ni_dvp = vp; 2495 newvp = NULLVP; 2496 2497 /* 2498 * If there is no cookie, assume directory was stale. 2499 */ 2500 nfs_dircookie_lock(dnp); 2501 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2502 if (cookiep) { 2503 cookie = *cookiep; 2504 nfs_dircookie_unlock(dnp); 2505 } else { 2506 nfs_dircookie_unlock(dnp); 2507 return (NFSERR_BAD_COOKIE); 2508 } 2509 /* 2510 * Loop around doing readdir rpc's of size nm_readdirsize 2511 * truncated to a multiple of DIRBLKSIZ. 2512 * The stopping criteria is EOF or buffer full. 2513 */ 2514 while (more_dirs && bigenough) { 2515 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2516 mreq = m_get2(NFSX_FH(1) + 6 * NFSX_UNSIGNED, M_WAITOK, 2517 MT_DATA, 0); 2518 mb = mreq; 2519 bpos = mtod(mb, caddr_t); 2520 nfsm_fhtom(vp, 1); 2521 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2522 *tl++ = cookie.nfsuquad[0]; 2523 *tl++ = cookie.nfsuquad[1]; 2524 mtx_lock(&dnp->n_mtx); 2525 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2526 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2527 mtx_unlock(&dnp->n_mtx); 2528 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2529 *tl = txdr_unsigned(nmp->nm_rsize); 2530 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2531 nfsm_postop_attr_va(vp, dattrflag, &dvattr); 2532 if (error) { 2533 m_freem(mrep); 2534 goto nfsmout; 2535 } 2536 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2537 mtx_lock(&dnp->n_mtx); 2538 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2539 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2540 mtx_unlock(&dnp->n_mtx); 2541 more_dirs = fxdr_unsigned(int, *tl); 2542 2543 /* loop thru the dir entries, doctoring them to 4bsd form */ 2544 while (more_dirs && bigenough) { 2545 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2546 fileno = fxdr_hyper(tl); 2547 len = fxdr_unsigned(int, *(tl + 2)); 2548 if (len <= 0 || len > NFS_MAXNAMLEN) { 2549 error = EBADRPC; 2550 m_freem(mrep); 2551 goto nfsmout; 2552 } 2553 tlen = nfsm_rndup(len); 2554 if (tlen == len) 2555 tlen += 4; /* To ensure null termination*/ 2556 left = DIRBLKSIZ - blksiz; 2557 if ((tlen + DIRHDSIZ) > left) { 2558 dp->d_reclen += left; 2559 uiop->uio_iov->iov_base = 2560 (char *)uiop->uio_iov->iov_base + left; 2561 uiop->uio_iov->iov_len -= left; 2562 uiop->uio_offset += left; 2563 uiop->uio_resid -= left; 2564 blksiz = 0; 2565 } 2566 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2567 bigenough = 0; 2568 if (bigenough) { 2569 dp = (struct dirent *)uiop->uio_iov->iov_base; 2570 dp->d_fileno = (int)fileno; 2571 dp->d_namlen = len; 2572 dp->d_reclen = tlen + DIRHDSIZ; 2573 dp->d_type = DT_UNKNOWN; 2574 blksiz += dp->d_reclen; 2575 if (blksiz == DIRBLKSIZ) 2576 blksiz = 0; 2577 uiop->uio_offset += DIRHDSIZ; 2578 uiop->uio_resid -= DIRHDSIZ; 2579 uiop->uio_iov->iov_base = 2580 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2581 uiop->uio_iov->iov_len -= DIRHDSIZ; 2582 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2583 cnp->cn_namelen = len; 2584 nfsm_mtouio(uiop, len); 2585 cp = uiop->uio_iov->iov_base; 2586 tlen -= len; 2587 *cp = '\0'; 2588 uiop->uio_iov->iov_base = 2589 (char *)uiop->uio_iov->iov_base + tlen; 2590 uiop->uio_iov->iov_len -= tlen; 2591 uiop->uio_offset += tlen; 2592 uiop->uio_resid -= tlen; 2593 } else 2594 nfsm_adv(nfsm_rndup(len)); 2595 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2596 if (bigenough) { 2597 cookie.nfsuquad[0] = *tl++; 2598 cookie.nfsuquad[1] = *tl++; 2599 } else 2600 tl += 2; 2601 2602 /* 2603 * Since the attributes are before the file handle 2604 * (sigh), we must skip over the attributes and then 2605 * come back and get them. 2606 */ 2607 attrflag = fxdr_unsigned(int, *tl); 2608 if (attrflag) { 2609 dpossav1 = dpos; 2610 mdsav1 = md; 2611 nfsm_adv(NFSX_V3FATTR); 2612 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2613 doit = fxdr_unsigned(int, *tl); 2614 /* 2615 * Skip loading the attrs for "..". There's a 2616 * race between loading the attrs here and 2617 * lookups that look for the directory currently 2618 * being read (in the parent). We try to acquire 2619 * the exclusive lock on ".." here, owning the 2620 * lock on the directory being read. Lookup will 2621 * hold the lock on ".." and try to acquire the 2622 * lock on the directory being read. 2623 * 2624 * There are other ways of fixing this, one would 2625 * be to do a trylock on the ".." vnode and skip 2626 * loading the attrs on ".." if it happens to be 2627 * locked by another process. But skipping the 2628 * attrload on ".." seems the easiest option. 2629 */ 2630 if (strcmp(dp->d_name, "..") == 0) { 2631 doit = 0; 2632 /* 2633 * We've already skipped over the attrs, 2634 * skip over the filehandle. And store d_type 2635 * as VDIR. 2636 */ 2637 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2638 i = fxdr_unsigned(int, *tl); 2639 nfsm_adv(nfsm_rndup(i)); 2640 dp->d_type = IFTODT(VTTOIF(VDIR)); 2641 } 2642 if (doit) { 2643 nfsm_getfh(fhp, fhsize, 1); 2644 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2645 VREF(vp); 2646 newvp = vp; 2647 np = dnp; 2648 } else { 2649 error = nfs_nget(vp->v_mount, fhp, 2650 fhsize, &np, LK_EXCLUSIVE); 2651 if (error) 2652 doit = 0; 2653 else 2654 newvp = NFSTOV(np); 2655 } 2656 } 2657 if (doit && bigenough) { 2658 dpossav2 = dpos; 2659 dpos = dpossav1; 2660 mdsav2 = md; 2661 md = mdsav1; 2662 nfsm_loadattr(newvp, &vattr); 2663 dpos = dpossav2; 2664 md = mdsav2; 2665 dp->d_type = IFTODT(VTTOIF(vattr.va_type)); 2666 ndp->ni_vp = newvp; 2667 if (newvp->v_type != VDIR || dattrflag != 0) 2668 cache_enter_time(ndp->ni_dvp, ndp->ni_vp, 2669 cnp, &vattr.va_ctime, 2670 newvp->v_type != VDIR ? NULL : 2671 &dvattr.va_ctime); 2672 } 2673 } else { 2674 /* Just skip over the file handle */ 2675 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2676 i = fxdr_unsigned(int, *tl); 2677 if (i) { 2678 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2679 fhsize = fxdr_unsigned(int, *tl); 2680 nfsm_adv(nfsm_rndup(fhsize)); 2681 } 2682 } 2683 if (newvp != NULLVP) { 2684 if (newvp == vp) 2685 vrele(newvp); 2686 else 2687 vput(newvp); 2688 newvp = NULLVP; 2689 } 2690 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2691 more_dirs = fxdr_unsigned(int, *tl); 2692 } 2693 /* 2694 * If at end of rpc data, get the eof boolean 2695 */ 2696 if (!more_dirs) { 2697 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2698 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2699 } 2700 m_freem(mrep); 2701 } 2702 /* 2703 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2704 * by increasing d_reclen for the last record. 2705 */ 2706 if (blksiz > 0) { 2707 left = DIRBLKSIZ - blksiz; 2708 dp->d_reclen += left; 2709 uiop->uio_iov->iov_base = 2710 (char *)uiop->uio_iov->iov_base + left; 2711 uiop->uio_iov->iov_len -= left; 2712 uiop->uio_offset += left; 2713 uiop->uio_resid -= left; 2714 } 2715 2716 /* 2717 * We are now either at the end of the directory or have filled the 2718 * block. 2719 */ 2720 if (bigenough) 2721 dnp->n_direofoffset = uiop->uio_offset; 2722 else { 2723 if (uiop->uio_resid > 0) 2724 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2725 nfs_dircookie_lock(dnp); 2726 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2727 *cookiep = cookie; 2728 nfs_dircookie_unlock(dnp); 2729 } 2730 nfsmout: 2731 if (newvp != NULLVP) { 2732 if (newvp == vp) 2733 vrele(newvp); 2734 else 2735 vput(newvp); 2736 newvp = NULLVP; 2737 } 2738 return (error); 2739 } 2740 2741 /* 2742 * Silly rename. To make the NFS filesystem that is stateless look a little 2743 * more like the "ufs" a remove of an active vnode is translated to a rename 2744 * to a funny looking filename that is removed by nfs_inactive on the 2745 * nfsnode. There is the potential for another process on a different client 2746 * to create the same funny name between the nfs_lookitup() fails and the 2747 * nfs_rename() completes, but... 2748 */ 2749 static int 2750 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2751 { 2752 struct sillyrename *sp; 2753 struct nfsnode *np; 2754 int error; 2755 short pid; 2756 unsigned int lticks; 2757 2758 cache_purge(dvp); 2759 np = VTONFS(vp); 2760 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2761 sp = malloc(sizeof (struct sillyrename), 2762 M_NFSREQ, M_WAITOK); 2763 sp->s_cred = crhold(cnp->cn_cred); 2764 sp->s_dvp = dvp; 2765 sp->s_removeit = nfs_removeit; 2766 VREF(dvp); 2767 2768 /* 2769 * Fudge together a funny name. 2770 * Changing the format of the funny name to accomodate more 2771 * sillynames per directory. 2772 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2773 * CPU ticks since boot. 2774 */ 2775 pid = cnp->cn_thread->td_proc->p_pid; 2776 lticks = (unsigned int)ticks; 2777 for ( ; ; ) { 2778 sp->s_namlen = sprintf(sp->s_name, 2779 ".nfs.%08x.%04x4.4", lticks, 2780 pid); 2781 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2782 cnp->cn_thread, NULL)) 2783 break; 2784 lticks++; 2785 } 2786 error = nfs_renameit(dvp, cnp, sp); 2787 if (error) 2788 goto bad; 2789 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2790 cnp->cn_thread, &np); 2791 np->n_sillyrename = sp; 2792 return (0); 2793 bad: 2794 vrele(sp->s_dvp); 2795 crfree(sp->s_cred); 2796 free((caddr_t)sp, M_NFSREQ); 2797 return (error); 2798 } 2799 2800 /* 2801 * Look up a file name and optionally either update the file handle or 2802 * allocate an nfsnode, depending on the value of npp. 2803 * npp == NULL --> just do the lookup 2804 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2805 * handled too 2806 * *npp != NULL --> update the file handle in the vnode 2807 */ 2808 static int 2809 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2810 struct thread *td, struct nfsnode **npp) 2811 { 2812 struct vnode *newvp = NULL; 2813 struct nfsnode *np, *dnp = VTONFS(dvp); 2814 caddr_t bpos, dpos; 2815 int error = 0, fhlen, attrflag; 2816 struct mbuf *mreq, *mrep, *md, *mb; 2817 nfsfh_t *nfhp; 2818 int v3 = NFS_ISV3(dvp); 2819 2820 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2821 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len), 2822 M_WAITOK, MT_DATA, 0); 2823 mb = mreq; 2824 bpos = mtod(mb, caddr_t); 2825 nfsm_fhtom(dvp, v3); 2826 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2827 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2828 if (npp && !error) { 2829 nfsm_getfh(nfhp, fhlen, v3); 2830 if (*npp) { 2831 np = *npp; 2832 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2833 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2834 np->n_fhp = &np->n_fh; 2835 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2836 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2837 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2838 np->n_fhsize = fhlen; 2839 newvp = NFSTOV(np); 2840 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2841 VREF(dvp); 2842 newvp = dvp; 2843 } else { 2844 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2845 if (error) { 2846 m_freem(mrep); 2847 return (error); 2848 } 2849 newvp = NFSTOV(np); 2850 } 2851 if (v3) { 2852 nfsm_postop_attr(newvp, attrflag); 2853 if (!attrflag && *npp == NULL) { 2854 m_freem(mrep); 2855 if (newvp == dvp) 2856 vrele(newvp); 2857 else 2858 vput(newvp); 2859 return (ENOENT); 2860 } 2861 } else 2862 nfsm_loadattr(newvp, NULL); 2863 } 2864 m_freem(mrep); 2865 nfsmout: 2866 if (npp && *npp == NULL) { 2867 if (error) { 2868 if (newvp) { 2869 if (newvp == dvp) 2870 vrele(newvp); 2871 else 2872 vput(newvp); 2873 } 2874 } else 2875 *npp = np; 2876 } 2877 return (error); 2878 } 2879 2880 /* 2881 * Nfs Version 3 commit rpc 2882 */ 2883 int 2884 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2885 struct thread *td) 2886 { 2887 u_int32_t *tl; 2888 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2889 caddr_t bpos, dpos; 2890 int error = 0, wccflag = NFSV3_WCCRATTR; 2891 struct mbuf *mreq, *mrep, *md, *mb; 2892 2893 mtx_lock(&nmp->nm_mtx); 2894 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2895 mtx_unlock(&nmp->nm_mtx); 2896 return (0); 2897 } 2898 mtx_unlock(&nmp->nm_mtx); 2899 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2900 mreq = m_get2(NFSX_FH(1), M_WAITOK, MT_DATA, 0); 2901 mb = mreq; 2902 bpos = mtod(mb, caddr_t); 2903 nfsm_fhtom(vp, 1); 2904 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2905 txdr_hyper(offset, tl); 2906 tl += 2; 2907 *tl = txdr_unsigned(cnt); 2908 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2909 nfsm_wcc_data(vp, wccflag); 2910 if (!error) { 2911 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2912 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2913 NFSX_V3WRITEVERF)) { 2914 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2915 NFSX_V3WRITEVERF); 2916 error = NFSERR_STALEWRITEVERF; 2917 } 2918 } 2919 m_freem(mrep); 2920 nfsmout: 2921 return (error); 2922 } 2923 2924 /* 2925 * Strategy routine. 2926 * For async requests when nfsiod(s) are running, queue the request by 2927 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2928 * request. 2929 */ 2930 static int 2931 nfs_strategy(struct vop_strategy_args *ap) 2932 { 2933 struct buf *bp = ap->a_bp; 2934 struct ucred *cr; 2935 2936 KASSERT(!(bp->b_flags & B_DONE), 2937 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2938 BUF_ASSERT_HELD(bp); 2939 2940 if (bp->b_iocmd == BIO_READ) 2941 cr = bp->b_rcred; 2942 else 2943 cr = bp->b_wcred; 2944 2945 /* 2946 * If the op is asynchronous and an i/o daemon is waiting 2947 * queue the request, wake it up and wait for completion 2948 * otherwise just do it ourselves. 2949 */ 2950 if ((bp->b_flags & B_ASYNC) == 0 || 2951 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2952 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2953 return (0); 2954 } 2955 2956 /* 2957 * fsync vnode op. Just call nfs_flush() with commit == 1. 2958 */ 2959 /* ARGSUSED */ 2960 static int 2961 nfs_fsync(struct vop_fsync_args *ap) 2962 { 2963 2964 return (nfs_flush(ap->a_vp, ap->a_waitfor, 1)); 2965 } 2966 2967 /* 2968 * Flush all the blocks associated with a vnode. 2969 * Walk through the buffer pool and push any dirty pages 2970 * associated with the vnode. 2971 */ 2972 static int 2973 nfs_flush(struct vnode *vp, int waitfor, int commit) 2974 { 2975 struct nfsnode *np = VTONFS(vp); 2976 struct buf *bp; 2977 int i; 2978 struct buf *nbp; 2979 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2980 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2981 int passone = 1; 2982 u_quad_t off, endoff, toff; 2983 struct ucred* wcred = NULL; 2984 struct buf **bvec = NULL; 2985 struct bufobj *bo; 2986 struct thread *td = curthread; 2987 #ifndef NFS_COMMITBVECSIZ 2988 #define NFS_COMMITBVECSIZ 20 2989 #endif 2990 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2991 int bvecsize = 0, bveccount; 2992 2993 if (nmp->nm_flag & NFSMNT_INT) 2994 slpflag = PCATCH; 2995 if (!commit) 2996 passone = 0; 2997 bo = &vp->v_bufobj; 2998 /* 2999 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 3000 * server, but has not been committed to stable storage on the server 3001 * yet. On the first pass, the byte range is worked out and the commit 3002 * rpc is done. On the second pass, nfs_writebp() is called to do the 3003 * job. 3004 */ 3005 again: 3006 off = (u_quad_t)-1; 3007 endoff = 0; 3008 bvecpos = 0; 3009 if (NFS_ISV3(vp) && commit) { 3010 if (bvec != NULL && bvec != bvec_on_stack) 3011 free(bvec, M_TEMP); 3012 /* 3013 * Count up how many buffers waiting for a commit. 3014 */ 3015 bveccount = 0; 3016 BO_LOCK(bo); 3017 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3018 if (!BUF_ISLOCKED(bp) && 3019 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 3020 == (B_DELWRI | B_NEEDCOMMIT)) 3021 bveccount++; 3022 } 3023 /* 3024 * Allocate space to remember the list of bufs to commit. It is 3025 * important to use M_NOWAIT here to avoid a race with nfs_write. 3026 * If we can't get memory (for whatever reason), we will end up 3027 * committing the buffers one-by-one in the loop below. 3028 */ 3029 if (bveccount > NFS_COMMITBVECSIZ) { 3030 /* 3031 * Release the vnode interlock to avoid a lock 3032 * order reversal. 3033 */ 3034 BO_UNLOCK(bo); 3035 bvec = (struct buf **) 3036 malloc(bveccount * sizeof(struct buf *), 3037 M_TEMP, M_NOWAIT); 3038 BO_LOCK(bo); 3039 if (bvec == NULL) { 3040 bvec = bvec_on_stack; 3041 bvecsize = NFS_COMMITBVECSIZ; 3042 } else 3043 bvecsize = bveccount; 3044 } else { 3045 bvec = bvec_on_stack; 3046 bvecsize = NFS_COMMITBVECSIZ; 3047 } 3048 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3049 if (bvecpos >= bvecsize) 3050 break; 3051 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3052 nbp = TAILQ_NEXT(bp, b_bobufs); 3053 continue; 3054 } 3055 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3056 (B_DELWRI | B_NEEDCOMMIT)) { 3057 BUF_UNLOCK(bp); 3058 nbp = TAILQ_NEXT(bp, b_bobufs); 3059 continue; 3060 } 3061 BO_UNLOCK(bo); 3062 bremfree(bp); 3063 /* 3064 * Work out if all buffers are using the same cred 3065 * so we can deal with them all with one commit. 3066 * 3067 * NOTE: we are not clearing B_DONE here, so we have 3068 * to do it later on in this routine if we intend to 3069 * initiate I/O on the bp. 3070 * 3071 * Note: to avoid loopback deadlocks, we do not 3072 * assign b_runningbufspace. 3073 */ 3074 if (wcred == NULL) 3075 wcred = bp->b_wcred; 3076 else if (wcred != bp->b_wcred) 3077 wcred = NOCRED; 3078 vfs_busy_pages(bp, 1); 3079 3080 BO_LOCK(bo); 3081 /* 3082 * bp is protected by being locked, but nbp is not 3083 * and vfs_busy_pages() may sleep. We have to 3084 * recalculate nbp. 3085 */ 3086 nbp = TAILQ_NEXT(bp, b_bobufs); 3087 3088 /* 3089 * A list of these buffers is kept so that the 3090 * second loop knows which buffers have actually 3091 * been committed. This is necessary, since there 3092 * may be a race between the commit rpc and new 3093 * uncommitted writes on the file. 3094 */ 3095 bvec[bvecpos++] = bp; 3096 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3097 bp->b_dirtyoff; 3098 if (toff < off) 3099 off = toff; 3100 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3101 if (toff > endoff) 3102 endoff = toff; 3103 } 3104 BO_UNLOCK(bo); 3105 } 3106 if (bvecpos > 0) { 3107 /* 3108 * Commit data on the server, as required. 3109 * If all bufs are using the same wcred, then use that with 3110 * one call for all of them, otherwise commit each one 3111 * separately. 3112 */ 3113 if (wcred != NOCRED) 3114 retv = nfs_commit(vp, off, (int)(endoff - off), 3115 wcred, td); 3116 else { 3117 retv = 0; 3118 for (i = 0; i < bvecpos; i++) { 3119 off_t off, size; 3120 bp = bvec[i]; 3121 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3122 bp->b_dirtyoff; 3123 size = (u_quad_t)(bp->b_dirtyend 3124 - bp->b_dirtyoff); 3125 retv = nfs_commit(vp, off, (int)size, 3126 bp->b_wcred, td); 3127 if (retv) break; 3128 } 3129 } 3130 3131 if (retv == NFSERR_STALEWRITEVERF) 3132 nfs_clearcommit(vp->v_mount); 3133 3134 /* 3135 * Now, either mark the blocks I/O done or mark the 3136 * blocks dirty, depending on whether the commit 3137 * succeeded. 3138 */ 3139 for (i = 0; i < bvecpos; i++) { 3140 bp = bvec[i]; 3141 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3142 if (retv) { 3143 /* 3144 * Error, leave B_DELWRI intact 3145 */ 3146 vfs_unbusy_pages(bp); 3147 brelse(bp); 3148 } else { 3149 /* 3150 * Success, remove B_DELWRI ( bundirty() ). 3151 * 3152 * b_dirtyoff/b_dirtyend seem to be NFS 3153 * specific. We should probably move that 3154 * into bundirty(). XXX 3155 */ 3156 bufobj_wref(bo); 3157 bp->b_flags |= B_ASYNC; 3158 bundirty(bp); 3159 bp->b_flags &= ~B_DONE; 3160 bp->b_ioflags &= ~BIO_ERROR; 3161 bp->b_dirtyoff = bp->b_dirtyend = 0; 3162 bufdone(bp); 3163 } 3164 } 3165 } 3166 3167 /* 3168 * Start/do any write(s) that are required. 3169 */ 3170 loop: 3171 BO_LOCK(bo); 3172 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3173 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3174 if (waitfor != MNT_WAIT || passone) 3175 continue; 3176 3177 error = BUF_TIMELOCK(bp, 3178 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3179 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3180 if (error == 0) { 3181 BUF_UNLOCK(bp); 3182 goto loop; 3183 } 3184 if (error == ENOLCK) { 3185 error = 0; 3186 goto loop; 3187 } 3188 if (nfs_sigintr(nmp, td)) { 3189 error = EINTR; 3190 goto done; 3191 } 3192 if (slpflag == PCATCH) { 3193 slpflag = 0; 3194 slptimeo = 2 * hz; 3195 } 3196 goto loop; 3197 } 3198 if ((bp->b_flags & B_DELWRI) == 0) 3199 panic("nfs_fsync: not dirty"); 3200 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3201 BUF_UNLOCK(bp); 3202 continue; 3203 } 3204 BO_UNLOCK(bo); 3205 bremfree(bp); 3206 if (passone || !commit) 3207 bp->b_flags |= B_ASYNC; 3208 else 3209 bp->b_flags |= B_ASYNC; 3210 bwrite(bp); 3211 if (nfs_sigintr(nmp, td)) { 3212 error = EINTR; 3213 goto done; 3214 } 3215 goto loop; 3216 } 3217 if (passone) { 3218 passone = 0; 3219 BO_UNLOCK(bo); 3220 goto again; 3221 } 3222 if (waitfor == MNT_WAIT) { 3223 while (bo->bo_numoutput) { 3224 error = bufobj_wwait(bo, slpflag, slptimeo); 3225 if (error) { 3226 BO_UNLOCK(bo); 3227 error = nfs_sigintr(nmp, td); 3228 if (error) 3229 goto done; 3230 if (slpflag == PCATCH) { 3231 slpflag = 0; 3232 slptimeo = 2 * hz; 3233 } 3234 BO_LOCK(bo); 3235 } 3236 } 3237 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3238 BO_UNLOCK(bo); 3239 goto loop; 3240 } 3241 /* 3242 * Wait for all the async IO requests to drain 3243 */ 3244 BO_UNLOCK(bo); 3245 mtx_lock(&np->n_mtx); 3246 while (np->n_directio_asyncwr > 0) { 3247 np->n_flag |= NFSYNCWAIT; 3248 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3249 &np->n_mtx, slpflag | (PRIBIO + 1), 3250 "nfsfsync", 0); 3251 if (error) { 3252 if (nfs_sigintr(nmp, td)) { 3253 mtx_unlock(&np->n_mtx); 3254 error = EINTR; 3255 goto done; 3256 } 3257 } 3258 } 3259 mtx_unlock(&np->n_mtx); 3260 } else 3261 BO_UNLOCK(bo); 3262 mtx_lock(&np->n_mtx); 3263 if (np->n_flag & NWRITEERR) { 3264 error = np->n_error; 3265 np->n_flag &= ~NWRITEERR; 3266 } 3267 if (commit && bo->bo_dirty.bv_cnt == 0 && 3268 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3269 np->n_flag &= ~NMODIFIED; 3270 mtx_unlock(&np->n_mtx); 3271 done: 3272 if (bvec != NULL && bvec != bvec_on_stack) 3273 free(bvec, M_TEMP); 3274 return (error); 3275 } 3276 3277 /* 3278 * NFS advisory byte-level locks. 3279 */ 3280 static int 3281 nfs_advlock(struct vop_advlock_args *ap) 3282 { 3283 struct vnode *vp = ap->a_vp; 3284 u_quad_t size; 3285 int error; 3286 3287 error = vn_lock(vp, LK_SHARED); 3288 if (error) 3289 return (error); 3290 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3291 size = VTONFS(vp)->n_size; 3292 VOP_UNLOCK(vp, 0); 3293 error = lf_advlock(ap, &(vp->v_lockf), size); 3294 } else { 3295 if (nfs_advlock_p) 3296 error = nfs_advlock_p(ap); 3297 else 3298 error = ENOLCK; 3299 } 3300 3301 return (error); 3302 } 3303 3304 /* 3305 * NFS advisory byte-level locks. 3306 */ 3307 static int 3308 nfs_advlockasync(struct vop_advlockasync_args *ap) 3309 { 3310 struct vnode *vp = ap->a_vp; 3311 u_quad_t size; 3312 int error; 3313 3314 error = vn_lock(vp, LK_SHARED); 3315 if (error) 3316 return (error); 3317 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3318 size = VTONFS(vp)->n_size; 3319 VOP_UNLOCK(vp, 0); 3320 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3321 } else { 3322 VOP_UNLOCK(vp, 0); 3323 error = EOPNOTSUPP; 3324 } 3325 return (error); 3326 } 3327 3328 /* 3329 * Print out the contents of an nfsnode. 3330 */ 3331 static int 3332 nfs_print(struct vop_print_args *ap) 3333 { 3334 struct vnode *vp = ap->a_vp; 3335 struct nfsnode *np = VTONFS(vp); 3336 3337 nfs_printf("\tfileid %ld fsid 0x%x", 3338 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3339 if (vp->v_type == VFIFO) 3340 fifo_printinfo(vp); 3341 printf("\n"); 3342 return (0); 3343 } 3344 3345 /* 3346 * This is the "real" nfs::bwrite(struct buf*). 3347 * We set B_CACHE if this is a VMIO buffer. 3348 */ 3349 int 3350 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3351 { 3352 int s; 3353 int oldflags = bp->b_flags; 3354 #if 0 3355 int retv = 1; 3356 off_t off; 3357 #endif 3358 3359 BUF_ASSERT_HELD(bp); 3360 3361 if (bp->b_flags & B_INVAL) { 3362 brelse(bp); 3363 return(0); 3364 } 3365 3366 bp->b_flags |= B_CACHE; 3367 3368 /* 3369 * Undirty the bp. We will redirty it later if the I/O fails. 3370 */ 3371 3372 s = splbio(); 3373 bundirty(bp); 3374 bp->b_flags &= ~B_DONE; 3375 bp->b_ioflags &= ~BIO_ERROR; 3376 bp->b_iocmd = BIO_WRITE; 3377 3378 bufobj_wref(bp->b_bufobj); 3379 curthread->td_ru.ru_oublock++; 3380 splx(s); 3381 3382 /* 3383 * Note: to avoid loopback deadlocks, we do not 3384 * assign b_runningbufspace. 3385 */ 3386 vfs_busy_pages(bp, 1); 3387 3388 BUF_KERNPROC(bp); 3389 bp->b_iooffset = dbtob(bp->b_blkno); 3390 bstrategy(bp); 3391 3392 if( (oldflags & B_ASYNC) == 0) { 3393 int rtval = bufwait(bp); 3394 3395 if (oldflags & B_DELWRI) { 3396 s = splbio(); 3397 reassignbuf(bp); 3398 splx(s); 3399 } 3400 brelse(bp); 3401 return (rtval); 3402 } 3403 3404 return (0); 3405 } 3406 3407 /* 3408 * nfs special file access vnode op. 3409 * Essentially just get vattr and then imitate iaccess() since the device is 3410 * local to the client. 3411 */ 3412 static int 3413 nfsspec_access(struct vop_access_args *ap) 3414 { 3415 struct vattr *vap; 3416 struct ucred *cred = ap->a_cred; 3417 struct vnode *vp = ap->a_vp; 3418 accmode_t accmode = ap->a_accmode; 3419 struct vattr vattr; 3420 int error; 3421 3422 /* 3423 * Disallow write attempts on filesystems mounted read-only; 3424 * unless the file is a socket, fifo, or a block or character 3425 * device resident on the filesystem. 3426 */ 3427 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3428 switch (vp->v_type) { 3429 case VREG: 3430 case VDIR: 3431 case VLNK: 3432 return (EROFS); 3433 default: 3434 break; 3435 } 3436 } 3437 vap = &vattr; 3438 error = VOP_GETATTR(vp, vap, cred); 3439 if (error) 3440 goto out; 3441 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3442 accmode, cred, NULL); 3443 out: 3444 return error; 3445 } 3446 3447 /* 3448 * Read wrapper for fifos. 3449 */ 3450 static int 3451 nfsfifo_read(struct vop_read_args *ap) 3452 { 3453 struct nfsnode *np = VTONFS(ap->a_vp); 3454 int error; 3455 3456 /* 3457 * Set access flag. 3458 */ 3459 mtx_lock(&np->n_mtx); 3460 np->n_flag |= NACC; 3461 vfs_timestamp(&np->n_atim); 3462 mtx_unlock(&np->n_mtx); 3463 error = fifo_specops.vop_read(ap); 3464 return error; 3465 } 3466 3467 /* 3468 * Write wrapper for fifos. 3469 */ 3470 static int 3471 nfsfifo_write(struct vop_write_args *ap) 3472 { 3473 struct nfsnode *np = VTONFS(ap->a_vp); 3474 3475 /* 3476 * Set update flag. 3477 */ 3478 mtx_lock(&np->n_mtx); 3479 np->n_flag |= NUPD; 3480 vfs_timestamp(&np->n_mtim); 3481 mtx_unlock(&np->n_mtx); 3482 return(fifo_specops.vop_write(ap)); 3483 } 3484 3485 /* 3486 * Close wrapper for fifos. 3487 * 3488 * Update the times on the nfsnode then do fifo close. 3489 */ 3490 static int 3491 nfsfifo_close(struct vop_close_args *ap) 3492 { 3493 struct vnode *vp = ap->a_vp; 3494 struct nfsnode *np = VTONFS(vp); 3495 struct vattr vattr; 3496 struct timespec ts; 3497 3498 mtx_lock(&np->n_mtx); 3499 if (np->n_flag & (NACC | NUPD)) { 3500 vfs_timestamp(&ts); 3501 if (np->n_flag & NACC) 3502 np->n_atim = ts; 3503 if (np->n_flag & NUPD) 3504 np->n_mtim = ts; 3505 np->n_flag |= NCHG; 3506 if (vrefcnt(vp) == 1 && 3507 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3508 VATTR_NULL(&vattr); 3509 if (np->n_flag & NACC) 3510 vattr.va_atime = np->n_atim; 3511 if (np->n_flag & NUPD) 3512 vattr.va_mtime = np->n_mtim; 3513 mtx_unlock(&np->n_mtx); 3514 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3515 goto out; 3516 } 3517 } 3518 mtx_unlock(&np->n_mtx); 3519 out: 3520 return (fifo_specops.vop_close(ap)); 3521 } 3522 3523 /* 3524 * Just call nfs_writebp() with the force argument set to 1. 3525 * 3526 * NOTE: B_DONE may or may not be set in a_bp on call. 3527 */ 3528 static int 3529 nfs_bwrite(struct buf *bp) 3530 { 3531 3532 return (nfs_writebp(bp, 1, curthread)); 3533 } 3534 3535 struct buf_ops buf_ops_nfs = { 3536 .bop_name = "buf_ops_nfs", 3537 .bop_write = nfs_bwrite, 3538 .bop_strategy = bufstrategy, 3539 .bop_sync = bufsync, 3540 .bop_bdflush = bufbdflush, 3541 };
Cache object: 3eb0780aac2c3b7fe85ca3dbf5262941
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