Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/7.3/sys/nfsclient/nfs_vnops.c 198425 2009-10-23 19:53:04Z jhb $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2 and 3 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/namei.h> 55 #include <sys/socket.h> 56 #include <sys/vnode.h> 57 #include <sys/dirent.h> 58 #include <sys/fcntl.h> 59 #include <sys/lockf.h> 60 #include <sys/stat.h> 61 #include <sys/sysctl.h> 62 #include <sys/signalvar.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_object.h> 68 69 #include <fs/fifofs/fifo.h> 70 71 #include <rpc/rpcclnt.h> 72 73 #include <nfs/rpcv2.h> 74 #include <nfs/nfsproto.h> 75 #include <nfsclient/nfs.h> 76 #include <nfsclient/nfsnode.h> 77 #include <nfsclient/nfsmount.h> 78 #include <nfsclient/nfs_lock.h> 79 #include <nfs/xdr_subs.h> 80 #include <nfsclient/nfsm_subs.h> 81 82 #include <net/if.h> 83 #include <netinet/in.h> 84 #include <netinet/in_var.h> 85 86 /* Defs */ 87 #define TRUE 1 88 #define FALSE 0 89 90 /* 91 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 92 * calls are not in getblk() and brelse() so that they would not be necessary 93 * here. 94 */ 95 #ifndef B_VMIO 96 #define vfs_busy_pages(bp, f) 97 #endif 98 99 static vop_read_t nfsfifo_read; 100 static vop_write_t nfsfifo_write; 101 static vop_close_t nfsfifo_close; 102 static int nfs_flush(struct vnode *, int, struct thread *, 103 int); 104 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 105 struct thread *); 106 static vop_lookup_t nfs_lookup; 107 static vop_create_t nfs_create; 108 static vop_mknod_t nfs_mknod; 109 static vop_open_t nfs_open; 110 static vop_close_t nfs_close; 111 static vop_access_t nfs_access; 112 static vop_getattr_t nfs_getattr; 113 static vop_setattr_t nfs_setattr; 114 static vop_read_t nfs_read; 115 static vop_fsync_t nfs_fsync; 116 static vop_remove_t nfs_remove; 117 static vop_link_t nfs_link; 118 static vop_rename_t nfs_rename; 119 static vop_mkdir_t nfs_mkdir; 120 static vop_rmdir_t nfs_rmdir; 121 static vop_symlink_t nfs_symlink; 122 static vop_readdir_t nfs_readdir; 123 static vop_strategy_t nfs_strategy; 124 static int nfs_lookitup(struct vnode *, const char *, int, 125 struct ucred *, struct thread *, struct nfsnode **); 126 static int nfs_sillyrename(struct vnode *, struct vnode *, 127 struct componentname *); 128 static vop_access_t nfsspec_access; 129 static vop_readlink_t nfs_readlink; 130 static vop_print_t nfs_print; 131 static vop_advlock_t nfs_advlock; 132 static vop_advlockasync_t nfs_advlockasync; 133 134 /* 135 * Global vfs data structures for nfs 136 */ 137 struct vop_vector nfs_vnodeops = { 138 .vop_default = &default_vnodeops, 139 .vop_access = nfs_access, 140 .vop_advlock = nfs_advlock, 141 .vop_advlockasync = nfs_advlockasync, 142 .vop_close = nfs_close, 143 .vop_create = nfs_create, 144 .vop_fsync = nfs_fsync, 145 .vop_getattr = nfs_getattr, 146 .vop_getpages = nfs_getpages, 147 .vop_putpages = nfs_putpages, 148 .vop_inactive = nfs_inactive, 149 .vop_lease = VOP_NULL, 150 .vop_link = nfs_link, 151 .vop_lookup = nfs_lookup, 152 .vop_mkdir = nfs_mkdir, 153 .vop_mknod = nfs_mknod, 154 .vop_open = nfs_open, 155 .vop_print = nfs_print, 156 .vop_read = nfs_read, 157 .vop_readdir = nfs_readdir, 158 .vop_readlink = nfs_readlink, 159 .vop_reclaim = nfs_reclaim, 160 .vop_remove = nfs_remove, 161 .vop_rename = nfs_rename, 162 .vop_rmdir = nfs_rmdir, 163 .vop_setattr = nfs_setattr, 164 .vop_strategy = nfs_strategy, 165 .vop_symlink = nfs_symlink, 166 .vop_write = nfs_write, 167 }; 168 169 struct vop_vector nfs_fifoops = { 170 .vop_default = &fifo_specops, 171 .vop_access = nfsspec_access, 172 .vop_close = nfsfifo_close, 173 .vop_fsync = nfs_fsync, 174 .vop_getattr = nfs_getattr, 175 .vop_inactive = nfs_inactive, 176 .vop_print = nfs_print, 177 .vop_read = nfsfifo_read, 178 .vop_reclaim = nfs_reclaim, 179 .vop_setattr = nfs_setattr, 180 .vop_write = nfsfifo_write, 181 }; 182 183 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 184 struct componentname *cnp, struct vattr *vap); 185 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 186 struct ucred *cred, struct thread *td); 187 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 188 int fnamelen, struct vnode *tdvp, 189 const char *tnameptr, int tnamelen, 190 struct ucred *cred, struct thread *td); 191 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 192 struct sillyrename *sp); 193 194 /* 195 * Global variables 196 */ 197 struct mtx nfs_iod_mtx; 198 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; 199 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 200 int nfs_numasync = 0; 201 vop_advlock_t *nfs_advlock_p = nfs_dolock; 202 vop_reclaim_t *nfs_reclaim_p = NULL; 203 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 204 205 SYSCTL_DECL(_vfs_nfs); 206 207 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 208 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 209 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 210 211 static int nfs_prime_access_cache = 1; 212 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 213 &nfs_prime_access_cache, 0, 214 "Prime NFS ACCESS cache when fetching attributes"); 215 216 static int nfsv3_commit_on_close = 0; 217 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 218 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 219 220 static int nfs_clean_pages_on_close = 1; 221 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 222 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 223 224 int nfs_directio_enable = 0; 225 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 226 &nfs_directio_enable, 0, "Enable NFS directio"); 227 228 /* 229 * This sysctl allows other processes to mmap a file that has been opened 230 * O_DIRECT by a process. In general, having processes mmap the file while 231 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 232 * this by default to prevent DoS attacks - to prevent a malicious user from 233 * opening up files O_DIRECT preventing other users from mmap'ing these 234 * files. "Protected" environments where stricter consistency guarantees are 235 * required can disable this knob. The process that opened the file O_DIRECT 236 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 237 * meaningful. 238 */ 239 int nfs_directio_allow_mmap = 1; 240 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 241 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 242 243 #if 0 244 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 245 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 246 247 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 248 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 249 #endif 250 251 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 252 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 253 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 254 255 /* 256 * SMP Locking Note : 257 * The list of locks after the description of the lock is the ordering 258 * of other locks acquired with the lock held. 259 * np->n_mtx : Protects the fields in the nfsnode. 260 VM Object Lock 261 VI_MTX (acquired indirectly) 262 * nmp->nm_mtx : Protects the fields in the nfsmount. 263 rep->r_mtx 264 * nfs_iod_mtx : Global lock, protects shared nfsiod state. 265 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 266 nmp->nm_mtx 267 rep->r_mtx 268 * rep->r_mtx : Protects the fields in an nfsreq. 269 */ 270 271 static int 272 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 273 struct ucred *cred) 274 { 275 const int v3 = 1; 276 u_int32_t *tl; 277 int error = 0, attrflag; 278 279 struct mbuf *mreq, *mrep, *md, *mb; 280 caddr_t bpos, dpos; 281 u_int32_t rmode; 282 struct nfsnode *np = VTONFS(vp); 283 284 nfsstats.rpccnt[NFSPROC_ACCESS]++; 285 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 286 mb = mreq; 287 bpos = mtod(mb, caddr_t); 288 nfsm_fhtom(vp, v3); 289 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 290 *tl = txdr_unsigned(wmode); 291 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 292 nfsm_postop_attr(vp, attrflag); 293 if (!error) { 294 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 295 rmode = fxdr_unsigned(u_int32_t, *tl); 296 mtx_lock(&np->n_mtx); 297 np->n_mode = rmode; 298 np->n_modeuid = cred->cr_uid; 299 np->n_modestamp = time_second; 300 mtx_unlock(&np->n_mtx); 301 } 302 m_freem(mrep); 303 nfsmout: 304 return (error); 305 } 306 307 /* 308 * nfs access vnode op. 309 * For nfs version 2, just return ok. File accesses may fail later. 310 * For nfs version 3, use the access rpc to check accessibility. If file modes 311 * are changed on the server, accesses might still fail later. 312 */ 313 static int 314 nfs_access(struct vop_access_args *ap) 315 { 316 struct vnode *vp = ap->a_vp; 317 int error = 0; 318 u_int32_t mode, wmode; 319 int v3 = NFS_ISV3(vp); 320 struct nfsnode *np = VTONFS(vp); 321 322 /* 323 * Disallow write attempts on filesystems mounted read-only; 324 * unless the file is a socket, fifo, or a block or character 325 * device resident on the filesystem. 326 */ 327 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 328 switch (vp->v_type) { 329 case VREG: 330 case VDIR: 331 case VLNK: 332 return (EROFS); 333 default: 334 break; 335 } 336 } 337 /* 338 * For nfs v3, check to see if we have done this recently, and if 339 * so return our cached result instead of making an ACCESS call. 340 * If not, do an access rpc, otherwise you are stuck emulating 341 * ufs_access() locally using the vattr. This may not be correct, 342 * since the server may apply other access criteria such as 343 * client uid-->server uid mapping that we do not know about. 344 */ 345 if (v3) { 346 if (ap->a_mode & VREAD) 347 mode = NFSV3ACCESS_READ; 348 else 349 mode = 0; 350 if (vp->v_type != VDIR) { 351 if (ap->a_mode & VWRITE) 352 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 353 if (ap->a_mode & VEXEC) 354 mode |= NFSV3ACCESS_EXECUTE; 355 } else { 356 if (ap->a_mode & VWRITE) 357 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 358 NFSV3ACCESS_DELETE); 359 if (ap->a_mode & VEXEC) 360 mode |= NFSV3ACCESS_LOOKUP; 361 } 362 /* XXX safety belt, only make blanket request if caching */ 363 if (nfsaccess_cache_timeout > 0) { 364 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 365 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 366 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 367 } else { 368 wmode = mode; 369 } 370 371 /* 372 * Does our cached result allow us to give a definite yes to 373 * this request? 374 */ 375 mtx_lock(&np->n_mtx); 376 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 377 (ap->a_cred->cr_uid == np->n_modeuid) && 378 ((np->n_mode & mode) == mode)) { 379 nfsstats.accesscache_hits++; 380 } else { 381 /* 382 * Either a no, or a don't know. Go to the wire. 383 */ 384 nfsstats.accesscache_misses++; 385 mtx_unlock(&np->n_mtx); 386 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 387 mtx_lock(&np->n_mtx); 388 if (!error) { 389 if ((np->n_mode & mode) != mode) { 390 error = EACCES; 391 } 392 } 393 } 394 mtx_unlock(&np->n_mtx); 395 return (error); 396 } else { 397 if ((error = nfsspec_access(ap)) != 0) { 398 return (error); 399 } 400 /* 401 * Attempt to prevent a mapped root from accessing a file 402 * which it shouldn't. We try to read a byte from the file 403 * if the user is root and the file is not zero length. 404 * After calling nfsspec_access, we should have the correct 405 * file size cached. 406 */ 407 mtx_lock(&np->n_mtx); 408 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 409 && VTONFS(vp)->n_size > 0) { 410 struct iovec aiov; 411 struct uio auio; 412 char buf[1]; 413 414 mtx_unlock(&np->n_mtx); 415 aiov.iov_base = buf; 416 aiov.iov_len = 1; 417 auio.uio_iov = &aiov; 418 auio.uio_iovcnt = 1; 419 auio.uio_offset = 0; 420 auio.uio_resid = 1; 421 auio.uio_segflg = UIO_SYSSPACE; 422 auio.uio_rw = UIO_READ; 423 auio.uio_td = ap->a_td; 424 425 if (vp->v_type == VREG) 426 error = nfs_readrpc(vp, &auio, ap->a_cred); 427 else if (vp->v_type == VDIR) { 428 char* bp; 429 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 430 aiov.iov_base = bp; 431 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 432 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 433 free(bp, M_TEMP); 434 } else if (vp->v_type == VLNK) 435 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 436 else 437 error = EACCES; 438 } else 439 mtx_unlock(&np->n_mtx); 440 return (error); 441 } 442 } 443 444 int nfs_otw_getattr_avoid = 0; 445 446 /* 447 * nfs open vnode op 448 * Check to see if the type is ok 449 * and that deletion is not in progress. 450 * For paged in text files, you will need to flush the page cache 451 * if consistency is lost. 452 */ 453 /* ARGSUSED */ 454 static int 455 nfs_open(struct vop_open_args *ap) 456 { 457 struct vnode *vp = ap->a_vp; 458 struct nfsnode *np = VTONFS(vp); 459 struct vattr vattr; 460 int error; 461 int fmode = ap->a_mode; 462 463 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 464 return (EOPNOTSUPP); 465 466 /* 467 * Get a valid lease. If cached data is stale, flush it. 468 */ 469 mtx_lock(&np->n_mtx); 470 if (np->n_flag & NMODIFIED) { 471 mtx_unlock(&np->n_mtx); 472 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 473 if (error == EINTR || error == EIO) 474 return (error); 475 np->n_attrstamp = 0; 476 if (vp->v_type == VDIR) 477 np->n_direofoffset = 0; 478 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 479 if (error) 480 return (error); 481 mtx_lock(&np->n_mtx); 482 np->n_mtime = vattr.va_mtime; 483 mtx_unlock(&np->n_mtx); 484 } else { 485 struct thread *td = curthread; 486 487 if (np->n_ac_ts_syscalls != td->td_syscalls || 488 np->n_ac_ts_tid != td->td_tid || 489 td->td_proc == NULL || 490 np->n_ac_ts_pid != td->td_proc->p_pid) { 491 np->n_attrstamp = 0; 492 } 493 mtx_unlock(&np->n_mtx); 494 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 495 if (error) 496 return (error); 497 mtx_lock(&np->n_mtx); 498 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 499 if (vp->v_type == VDIR) 500 np->n_direofoffset = 0; 501 mtx_unlock(&np->n_mtx); 502 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 503 if (error == EINTR || error == EIO) { 504 return (error); 505 } 506 mtx_lock(&np->n_mtx); 507 np->n_mtime = vattr.va_mtime; 508 } 509 mtx_unlock(&np->n_mtx); 510 } 511 /* 512 * If the object has >= 1 O_DIRECT active opens, we disable caching. 513 */ 514 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 515 if (np->n_directio_opens == 0) { 516 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 517 if (error) 518 return (error); 519 mtx_lock(&np->n_mtx); 520 np->n_flag |= NNONCACHE; 521 mtx_unlock(&np->n_mtx); 522 } 523 np->n_directio_opens++; 524 } 525 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 526 return (0); 527 } 528 529 /* 530 * nfs close vnode op 531 * What an NFS client should do upon close after writing is a debatable issue. 532 * Most NFS clients push delayed writes to the server upon close, basically for 533 * two reasons: 534 * 1 - So that any write errors may be reported back to the client process 535 * doing the close system call. By far the two most likely errors are 536 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 537 * 2 - To put a worst case upper bound on cache inconsistency between 538 * multiple clients for the file. 539 * There is also a consistency problem for Version 2 of the protocol w.r.t. 540 * not being able to tell if other clients are writing a file concurrently, 541 * since there is no way of knowing if the changed modify time in the reply 542 * is only due to the write for this client. 543 * (NFS Version 3 provides weak cache consistency data in the reply that 544 * should be sufficient to detect and handle this case.) 545 * 546 * The current code does the following: 547 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 548 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 549 * or commit them (this satisfies 1 and 2 except for the 550 * case where the server crashes after this close but 551 * before the commit RPC, which is felt to be "good 552 * enough". Changing the last argument to nfs_flush() to 553 * a 1 would force a commit operation, if it is felt a 554 * commit is necessary now. 555 */ 556 /* ARGSUSED */ 557 static int 558 nfs_close(struct vop_close_args *ap) 559 { 560 struct vnode *vp = ap->a_vp; 561 struct nfsnode *np = VTONFS(vp); 562 int error = 0; 563 int fmode = ap->a_fflag; 564 565 if (vp->v_type == VREG) { 566 /* 567 * Examine and clean dirty pages, regardless of NMODIFIED. 568 * This closes a major hole in close-to-open consistency. 569 * We want to push out all dirty pages (and buffers) on 570 * close, regardless of whether they were dirtied by 571 * mmap'ed writes or via write(). 572 */ 573 if (nfs_clean_pages_on_close && vp->v_object) { 574 VM_OBJECT_LOCK(vp->v_object); 575 vm_object_page_clean(vp->v_object, 0, 0, 0); 576 VM_OBJECT_UNLOCK(vp->v_object); 577 } 578 mtx_lock(&np->n_mtx); 579 if (np->n_flag & NMODIFIED) { 580 mtx_unlock(&np->n_mtx); 581 if (NFS_ISV3(vp)) { 582 /* 583 * Under NFSv3 we have dirty buffers to dispose of. We 584 * must flush them to the NFS server. We have the option 585 * of waiting all the way through the commit rpc or just 586 * waiting for the initial write. The default is to only 587 * wait through the initial write so the data is in the 588 * server's cache, which is roughly similar to the state 589 * a standard disk subsystem leaves the file in on close(). 590 * 591 * We cannot clear the NMODIFIED bit in np->n_flag due to 592 * potential races with other processes, and certainly 593 * cannot clear it if we don't commit. 594 */ 595 int cm = nfsv3_commit_on_close ? 1 : 0; 596 error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); 597 /* np->n_flag &= ~NMODIFIED; */ 598 } else 599 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 600 mtx_lock(&np->n_mtx); 601 } 602 if (np->n_flag & NWRITEERR) { 603 np->n_flag &= ~NWRITEERR; 604 error = np->n_error; 605 } 606 mtx_unlock(&np->n_mtx); 607 } 608 if (nfs_directio_enable) 609 KASSERT((np->n_directio_asyncwr == 0), 610 ("nfs_close: dirty unflushed (%d) directio buffers\n", 611 np->n_directio_asyncwr)); 612 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 613 mtx_lock(&np->n_mtx); 614 KASSERT((np->n_directio_opens > 0), 615 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 616 np->n_directio_opens--; 617 if (np->n_directio_opens == 0) 618 np->n_flag &= ~NNONCACHE; 619 mtx_unlock(&np->n_mtx); 620 } 621 return (error); 622 } 623 624 /* 625 * nfs getattr call from vfs. 626 */ 627 static int 628 nfs_getattr(struct vop_getattr_args *ap) 629 { 630 struct vnode *vp = ap->a_vp; 631 struct nfsnode *np = VTONFS(vp); 632 struct vattr *vap = ap->a_vap; 633 struct vattr vattr; 634 caddr_t bpos, dpos; 635 int error = 0; 636 struct mbuf *mreq, *mrep, *md, *mb; 637 int v3 = NFS_ISV3(vp); 638 639 /* 640 * Update local times for special files. 641 */ 642 mtx_lock(&np->n_mtx); 643 if (np->n_flag & (NACC | NUPD)) 644 np->n_flag |= NCHG; 645 mtx_unlock(&np->n_mtx); 646 /* 647 * First look in the cache. 648 */ 649 if (nfs_getattrcache(vp, &vattr) == 0) 650 goto nfsmout; 651 if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) { 652 nfsstats.accesscache_misses++; 653 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred); 654 if (nfs_getattrcache(vp, &vattr) == 0) 655 goto nfsmout; 656 } 657 nfsstats.rpccnt[NFSPROC_GETATTR]++; 658 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 659 mb = mreq; 660 bpos = mtod(mb, caddr_t); 661 nfsm_fhtom(vp, v3); 662 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred); 663 if (!error) { 664 nfsm_loadattr(vp, &vattr); 665 } 666 m_freem(mrep); 667 nfsmout: 668 vap->va_type = vattr.va_type; 669 vap->va_mode = vattr.va_mode; 670 vap->va_nlink = vattr.va_nlink; 671 vap->va_uid = vattr.va_uid; 672 vap->va_gid = vattr.va_gid; 673 vap->va_fsid = vattr.va_fsid; 674 vap->va_fileid = vattr.va_fileid; 675 vap->va_size = vattr.va_size; 676 vap->va_blocksize = vattr.va_blocksize; 677 vap->va_atime = vattr.va_atime; 678 vap->va_mtime = vattr.va_mtime; 679 vap->va_ctime = vattr.va_ctime; 680 vap->va_gen = vattr.va_gen; 681 vap->va_flags = vattr.va_flags; 682 vap->va_rdev = vattr.va_rdev; 683 vap->va_bytes = vattr.va_bytes; 684 vap->va_filerev = vattr.va_filerev; 685 686 return (error); 687 } 688 689 /* 690 * nfs setattr call. 691 */ 692 static int 693 nfs_setattr(struct vop_setattr_args *ap) 694 { 695 struct vnode *vp = ap->a_vp; 696 struct nfsnode *np = VTONFS(vp); 697 struct vattr *vap = ap->a_vap; 698 int error = 0; 699 u_quad_t tsize; 700 701 #ifndef nolint 702 tsize = (u_quad_t)0; 703 #endif 704 705 /* 706 * Setting of flags and marking of atimes are not supported. 707 */ 708 if (vap->va_flags != VNOVAL || (vap->va_vaflags & VA_MARK_ATIME)) 709 return (EOPNOTSUPP); 710 711 /* 712 * Disallow write attempts if the filesystem is mounted read-only. 713 */ 714 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 715 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 716 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 717 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 718 error = EROFS; 719 goto out; 720 } 721 if (vap->va_size != VNOVAL) { 722 switch (vp->v_type) { 723 case VDIR: 724 return (EISDIR); 725 case VCHR: 726 case VBLK: 727 case VSOCK: 728 case VFIFO: 729 if (vap->va_mtime.tv_sec == VNOVAL && 730 vap->va_atime.tv_sec == VNOVAL && 731 vap->va_mode == (mode_t)VNOVAL && 732 vap->va_uid == (uid_t)VNOVAL && 733 vap->va_gid == (gid_t)VNOVAL) 734 return (0); 735 vap->va_size = VNOVAL; 736 break; 737 default: 738 /* 739 * Disallow write attempts if the filesystem is 740 * mounted read-only. 741 */ 742 if (vp->v_mount->mnt_flag & MNT_RDONLY) 743 return (EROFS); 744 /* 745 * We run vnode_pager_setsize() early (why?), 746 * we must set np->n_size now to avoid vinvalbuf 747 * V_SAVE races that might setsize a lower 748 * value. 749 */ 750 mtx_lock(&np->n_mtx); 751 tsize = np->n_size; 752 mtx_unlock(&np->n_mtx); 753 error = nfs_meta_setsize(vp, ap->a_cred, 754 ap->a_td, vap->va_size); 755 mtx_lock(&np->n_mtx); 756 if (np->n_flag & NMODIFIED) { 757 tsize = np->n_size; 758 mtx_unlock(&np->n_mtx); 759 if (vap->va_size == 0) 760 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); 761 else 762 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 763 if (error) { 764 vnode_pager_setsize(vp, tsize); 765 goto out; 766 } 767 } else 768 mtx_unlock(&np->n_mtx); 769 /* 770 * np->n_size has already been set to vap->va_size 771 * in nfs_meta_setsize(). We must set it again since 772 * nfs_loadattrcache() could be called through 773 * nfs_meta_setsize() and could modify np->n_size. 774 */ 775 mtx_lock(&np->n_mtx); 776 np->n_vattr.va_size = np->n_size = vap->va_size; 777 mtx_unlock(&np->n_mtx); 778 }; 779 } else { 780 mtx_lock(&np->n_mtx); 781 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 782 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 783 mtx_unlock(&np->n_mtx); 784 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) != 0 && 785 (error == EINTR || error == EIO)) 786 return error; 787 } else 788 mtx_unlock(&np->n_mtx); 789 } 790 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 791 if (error && vap->va_size != VNOVAL) { 792 mtx_lock(&np->n_mtx); 793 np->n_size = np->n_vattr.va_size = tsize; 794 vnode_pager_setsize(vp, tsize); 795 mtx_unlock(&np->n_mtx); 796 } 797 out: 798 return (error); 799 } 800 801 /* 802 * Do an nfs setattr rpc. 803 */ 804 static int 805 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 806 struct thread *td) 807 { 808 struct nfsv2_sattr *sp; 809 struct nfsnode *np = VTONFS(vp); 810 caddr_t bpos, dpos; 811 u_int32_t *tl; 812 int error = 0, wccflag = NFSV3_WCCRATTR; 813 struct mbuf *mreq, *mrep, *md, *mb; 814 int v3 = NFS_ISV3(vp); 815 816 nfsstats.rpccnt[NFSPROC_SETATTR]++; 817 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 818 mb = mreq; 819 bpos = mtod(mb, caddr_t); 820 nfsm_fhtom(vp, v3); 821 if (v3) { 822 nfsm_v3attrbuild(vap, TRUE); 823 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 824 *tl = nfs_false; 825 } else { 826 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 827 if (vap->va_mode == (mode_t)VNOVAL) 828 sp->sa_mode = nfs_xdrneg1; 829 else 830 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 831 if (vap->va_uid == (uid_t)VNOVAL) 832 sp->sa_uid = nfs_xdrneg1; 833 else 834 sp->sa_uid = txdr_unsigned(vap->va_uid); 835 if (vap->va_gid == (gid_t)VNOVAL) 836 sp->sa_gid = nfs_xdrneg1; 837 else 838 sp->sa_gid = txdr_unsigned(vap->va_gid); 839 sp->sa_size = txdr_unsigned(vap->va_size); 840 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 841 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 842 } 843 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 844 if (v3) { 845 np->n_modestamp = 0; 846 nfsm_wcc_data(vp, wccflag); 847 } else 848 nfsm_loadattr(vp, NULL); 849 m_freem(mrep); 850 nfsmout: 851 return (error); 852 } 853 854 /* 855 * nfs lookup call, one step at a time... 856 * First look in cache 857 * If not found, unlock the directory nfsnode and do the rpc 858 */ 859 static int 860 nfs_lookup(struct vop_lookup_args *ap) 861 { 862 struct componentname *cnp = ap->a_cnp; 863 struct vnode *dvp = ap->a_dvp; 864 struct vnode **vpp = ap->a_vpp; 865 struct vattr vattr; 866 time_t dmtime; 867 int flags = cnp->cn_flags; 868 struct vnode *newvp; 869 struct nfsmount *nmp; 870 caddr_t bpos, dpos; 871 struct mbuf *mreq, *mrep, *md, *mb; 872 long len; 873 nfsfh_t *fhp; 874 struct nfsnode *np; 875 int error = 0, attrflag, fhsize; 876 int v3 = NFS_ISV3(dvp); 877 struct thread *td = cnp->cn_thread; 878 879 *vpp = NULLVP; 880 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 881 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 882 return (EROFS); 883 if (dvp->v_type != VDIR) 884 return (ENOTDIR); 885 nmp = VFSTONFS(dvp->v_mount); 886 np = VTONFS(dvp); 887 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 888 *vpp = NULLVP; 889 return (error); 890 } 891 error = cache_lookup(dvp, vpp, cnp); 892 if (error > 0 && error != ENOENT) 893 return (error); 894 if (error == -1) { 895 /* 896 * We only accept a positive hit in the cache if the 897 * change time of the file matches our cached copy. 898 * Otherwise, we discard the cache entry and fallback 899 * to doing a lookup RPC. 900 */ 901 newvp = *vpp; 902 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td) 903 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 904 nfsstats.lookupcache_hits++; 905 if (cnp->cn_nameiop != LOOKUP && 906 (flags & ISLASTCN)) 907 cnp->cn_flags |= SAVENAME; 908 return (0); 909 } 910 cache_purge(newvp); 911 if (dvp != newvp) 912 vput(newvp); 913 else 914 vrele(newvp); 915 *vpp = NULLVP; 916 } else if (error == ENOENT) { 917 /* 918 * We only accept a negative hit in the cache if the 919 * modification time of the parent directory matches 920 * our cached copy. Otherwise, we discard all of the 921 * negative cache entries for this directory. 922 */ 923 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred, td) == 0 && 924 vattr.va_mtime.tv_sec == np->n_dmtime) { 925 nfsstats.lookupcache_hits++; 926 return (ENOENT); 927 } 928 cache_purge_negative(dvp); 929 mtx_lock(&np->n_mtx); 930 np->n_dmtime = 0; 931 mtx_unlock(&np->n_mtx); 932 } 933 934 /* 935 * Cache the modification time of the parent directory in case 936 * the lookup fails and results in adding the first negative 937 * name cache entry for the directory. Since this is reading 938 * a single time_t, don't bother with locking. The 939 * modification time may be a bit stale, but it must be read 940 * before performing the lookup RPC to prevent a race where 941 * another lookup updates the timestamp on the directory after 942 * the lookup RPC has been performed on the server but before 943 * n_dmtime is set at the end of this function. 944 */ 945 dmtime = np->n_vattr.va_mtime.tv_sec; 946 error = 0; 947 newvp = NULLVP; 948 nfsstats.lookupcache_misses++; 949 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 950 len = cnp->cn_namelen; 951 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 952 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 953 mb = mreq; 954 bpos = mtod(mb, caddr_t); 955 nfsm_fhtom(dvp, v3); 956 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 957 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 958 if (error) { 959 if (v3) { 960 nfsm_postop_attr(dvp, attrflag); 961 m_freem(mrep); 962 } 963 goto nfsmout; 964 } 965 nfsm_getfh(fhp, fhsize, v3); 966 967 /* 968 * Handle RENAME case... 969 */ 970 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 971 if (NFS_CMPFH(np, fhp, fhsize)) { 972 m_freem(mrep); 973 return (EISDIR); 974 } 975 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE); 976 if (error) { 977 m_freem(mrep); 978 return (error); 979 } 980 newvp = NFSTOV(np); 981 if (v3) { 982 nfsm_postop_attr(newvp, attrflag); 983 nfsm_postop_attr(dvp, attrflag); 984 } else 985 nfsm_loadattr(newvp, NULL); 986 *vpp = newvp; 987 m_freem(mrep); 988 cnp->cn_flags |= SAVENAME; 989 return (0); 990 } 991 992 if (flags & ISDOTDOT) { 993 VOP_UNLOCK(dvp, 0, td); 994 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 995 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 996 if (error) 997 return (error); 998 newvp = NFSTOV(np); 999 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1000 VREF(dvp); 1001 newvp = dvp; 1002 } else { 1003 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 1004 if (error) { 1005 m_freem(mrep); 1006 return (error); 1007 } 1008 newvp = NFSTOV(np); 1009 } 1010 if (v3) { 1011 nfsm_postop_attr(newvp, attrflag); 1012 nfsm_postop_attr(dvp, attrflag); 1013 } else 1014 nfsm_loadattr(newvp, NULL); 1015 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1016 cnp->cn_flags |= SAVENAME; 1017 if ((cnp->cn_flags & MAKEENTRY) && 1018 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 1019 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 1020 cache_enter(dvp, newvp, cnp); 1021 } 1022 *vpp = newvp; 1023 m_freem(mrep); 1024 nfsmout: 1025 if (error) { 1026 if (newvp != NULLVP) { 1027 vput(newvp); 1028 *vpp = NULLVP; 1029 } 1030 1031 if (error != ENOENT) 1032 goto done; 1033 1034 /* The requested file was not found. */ 1035 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1036 (flags & ISLASTCN)) { 1037 /* 1038 * XXX: UFS does a full VOP_ACCESS(dvp, 1039 * VWRITE) here instead of just checking 1040 * MNT_RDONLY. 1041 */ 1042 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1043 return (EROFS); 1044 cnp->cn_flags |= SAVENAME; 1045 return (EJUSTRETURN); 1046 } 1047 1048 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) { 1049 /* 1050 * Maintain n_dmtime as the modification time 1051 * of the parent directory when the oldest -ve 1052 * name cache entry for this directory was 1053 * added. If a -ve cache entry has already 1054 * been added with a newer modification time 1055 * by a concurrent lookup, then don't bother 1056 * adding a cache entry. The modification 1057 * time of the directory might have changed 1058 * due to the file this lookup failed to find 1059 * being created. In that case a subsequent 1060 * lookup would incorrectly use the entry 1061 * added here instead of doing an extra 1062 * lookup. 1063 */ 1064 mtx_lock(&np->n_mtx); 1065 if (np->n_dmtime <= dmtime) { 1066 if (np->n_dmtime == 0) 1067 np->n_dmtime = dmtime; 1068 mtx_unlock(&np->n_mtx); 1069 cache_enter(dvp, NULL, cnp); 1070 } else 1071 mtx_unlock(&np->n_mtx); 1072 } 1073 return (ENOENT); 1074 } 1075 done: 1076 return (error); 1077 } 1078 1079 /* 1080 * nfs read call. 1081 * Just call nfs_bioread() to do the work. 1082 */ 1083 static int 1084 nfs_read(struct vop_read_args *ap) 1085 { 1086 struct vnode *vp = ap->a_vp; 1087 1088 switch (vp->v_type) { 1089 case VREG: 1090 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1091 case VDIR: 1092 return (EISDIR); 1093 default: 1094 return (EOPNOTSUPP); 1095 } 1096 } 1097 1098 /* 1099 * nfs readlink call 1100 */ 1101 static int 1102 nfs_readlink(struct vop_readlink_args *ap) 1103 { 1104 struct vnode *vp = ap->a_vp; 1105 1106 if (vp->v_type != VLNK) 1107 return (EINVAL); 1108 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1109 } 1110 1111 /* 1112 * Do a readlink rpc. 1113 * Called by nfs_doio() from below the buffer cache. 1114 */ 1115 int 1116 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1117 { 1118 caddr_t bpos, dpos; 1119 int error = 0, len, attrflag; 1120 struct mbuf *mreq, *mrep, *md, *mb; 1121 int v3 = NFS_ISV3(vp); 1122 1123 nfsstats.rpccnt[NFSPROC_READLINK]++; 1124 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1125 mb = mreq; 1126 bpos = mtod(mb, caddr_t); 1127 nfsm_fhtom(vp, v3); 1128 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1129 if (v3) 1130 nfsm_postop_attr(vp, attrflag); 1131 if (!error) { 1132 nfsm_strsiz(len, NFS_MAXPATHLEN); 1133 if (len == NFS_MAXPATHLEN) { 1134 struct nfsnode *np = VTONFS(vp); 1135 mtx_lock(&np->n_mtx); 1136 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1137 len = np->n_size; 1138 mtx_unlock(&np->n_mtx); 1139 } 1140 nfsm_mtouio(uiop, len); 1141 } 1142 m_freem(mrep); 1143 nfsmout: 1144 return (error); 1145 } 1146 1147 /* 1148 * nfs read rpc call 1149 * Ditto above 1150 */ 1151 int 1152 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1153 { 1154 u_int32_t *tl; 1155 caddr_t bpos, dpos; 1156 struct mbuf *mreq, *mrep, *md, *mb; 1157 struct nfsmount *nmp; 1158 int error = 0, len, retlen, tsiz, eof, attrflag; 1159 int v3 = NFS_ISV3(vp); 1160 int rsize; 1161 1162 #ifndef nolint 1163 eof = 0; 1164 #endif 1165 nmp = VFSTONFS(vp->v_mount); 1166 tsiz = uiop->uio_resid; 1167 mtx_lock(&nmp->nm_mtx); 1168 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1169 mtx_unlock(&nmp->nm_mtx); 1170 return (EFBIG); 1171 } 1172 rsize = nmp->nm_rsize; 1173 mtx_unlock(&nmp->nm_mtx); 1174 while (tsiz > 0) { 1175 nfsstats.rpccnt[NFSPROC_READ]++; 1176 len = (tsiz > rsize) ? rsize : tsiz; 1177 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1178 mb = mreq; 1179 bpos = mtod(mb, caddr_t); 1180 nfsm_fhtom(vp, v3); 1181 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1182 if (v3) { 1183 txdr_hyper(uiop->uio_offset, tl); 1184 *(tl + 2) = txdr_unsigned(len); 1185 } else { 1186 *tl++ = txdr_unsigned(uiop->uio_offset); 1187 *tl++ = txdr_unsigned(len); 1188 *tl = 0; 1189 } 1190 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1191 if (v3) { 1192 nfsm_postop_attr(vp, attrflag); 1193 if (error) { 1194 m_freem(mrep); 1195 goto nfsmout; 1196 } 1197 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1198 eof = fxdr_unsigned(int, *(tl + 1)); 1199 } else { 1200 nfsm_loadattr(vp, NULL); 1201 } 1202 nfsm_strsiz(retlen, rsize); 1203 nfsm_mtouio(uiop, retlen); 1204 m_freem(mrep); 1205 tsiz -= retlen; 1206 if (v3) { 1207 if (eof || retlen == 0) { 1208 tsiz = 0; 1209 } 1210 } else if (retlen < len) { 1211 tsiz = 0; 1212 } 1213 } 1214 nfsmout: 1215 return (error); 1216 } 1217 1218 /* 1219 * nfs write call 1220 */ 1221 int 1222 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1223 int *iomode, int *must_commit) 1224 { 1225 u_int32_t *tl; 1226 int32_t backup; 1227 caddr_t bpos, dpos; 1228 struct mbuf *mreq, *mrep, *md, *mb; 1229 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1230 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1231 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1232 int wsize; 1233 1234 #ifndef DIAGNOSTIC 1235 if (uiop->uio_iovcnt != 1) 1236 panic("nfs: writerpc iovcnt > 1"); 1237 #endif 1238 *must_commit = 0; 1239 tsiz = uiop->uio_resid; 1240 mtx_lock(&nmp->nm_mtx); 1241 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1242 mtx_unlock(&nmp->nm_mtx); 1243 return (EFBIG); 1244 } 1245 wsize = nmp->nm_wsize; 1246 mtx_unlock(&nmp->nm_mtx); 1247 while (tsiz > 0) { 1248 nfsstats.rpccnt[NFSPROC_WRITE]++; 1249 len = (tsiz > wsize) ? wsize : tsiz; 1250 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1251 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1252 mb = mreq; 1253 bpos = mtod(mb, caddr_t); 1254 nfsm_fhtom(vp, v3); 1255 if (v3) { 1256 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1257 txdr_hyper(uiop->uio_offset, tl); 1258 tl += 2; 1259 *tl++ = txdr_unsigned(len); 1260 *tl++ = txdr_unsigned(*iomode); 1261 *tl = txdr_unsigned(len); 1262 } else { 1263 u_int32_t x; 1264 1265 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1266 /* Set both "begin" and "current" to non-garbage. */ 1267 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1268 *tl++ = x; /* "begin offset" */ 1269 *tl++ = x; /* "current offset" */ 1270 x = txdr_unsigned(len); 1271 *tl++ = x; /* total to this offset */ 1272 *tl = x; /* size of this write */ 1273 } 1274 nfsm_uiotom(uiop, len); 1275 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1276 if (v3) { 1277 wccflag = NFSV3_WCCCHK; 1278 nfsm_wcc_data(vp, wccflag); 1279 if (!error) { 1280 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1281 + NFSX_V3WRITEVERF); 1282 rlen = fxdr_unsigned(int, *tl++); 1283 if (rlen == 0) { 1284 error = NFSERR_IO; 1285 m_freem(mrep); 1286 break; 1287 } else if (rlen < len) { 1288 backup = len - rlen; 1289 uiop->uio_iov->iov_base = 1290 (char *)uiop->uio_iov->iov_base - 1291 backup; 1292 uiop->uio_iov->iov_len += backup; 1293 uiop->uio_offset -= backup; 1294 uiop->uio_resid += backup; 1295 len = rlen; 1296 } 1297 commit = fxdr_unsigned(int, *tl++); 1298 1299 /* 1300 * Return the lowest committment level 1301 * obtained by any of the RPCs. 1302 */ 1303 if (committed == NFSV3WRITE_FILESYNC) 1304 committed = commit; 1305 else if (committed == NFSV3WRITE_DATASYNC && 1306 commit == NFSV3WRITE_UNSTABLE) 1307 committed = commit; 1308 mtx_lock(&nmp->nm_mtx); 1309 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1310 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1311 NFSX_V3WRITEVERF); 1312 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1313 } else if (bcmp((caddr_t)tl, 1314 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1315 *must_commit = 1; 1316 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1317 NFSX_V3WRITEVERF); 1318 } 1319 mtx_unlock(&nmp->nm_mtx); 1320 } 1321 } else { 1322 nfsm_loadattr(vp, NULL); 1323 } 1324 if (wccflag) { 1325 mtx_lock(&(VTONFS(vp))->n_mtx); 1326 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1327 mtx_unlock(&(VTONFS(vp))->n_mtx); 1328 } 1329 m_freem(mrep); 1330 if (error) 1331 break; 1332 tsiz -= len; 1333 } 1334 nfsmout: 1335 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC) 1336 committed = NFSV3WRITE_FILESYNC; 1337 *iomode = committed; 1338 if (error) 1339 uiop->uio_resid = tsiz; 1340 return (error); 1341 } 1342 1343 /* 1344 * nfs mknod rpc 1345 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1346 * mode set to specify the file type and the size field for rdev. 1347 */ 1348 static int 1349 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1350 struct vattr *vap) 1351 { 1352 struct nfsv2_sattr *sp; 1353 u_int32_t *tl; 1354 struct vnode *newvp = NULL; 1355 struct nfsnode *np = NULL; 1356 struct vattr vattr; 1357 caddr_t bpos, dpos; 1358 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1359 struct mbuf *mreq, *mrep, *md, *mb; 1360 u_int32_t rdev; 1361 int v3 = NFS_ISV3(dvp); 1362 1363 if (vap->va_type == VCHR || vap->va_type == VBLK) 1364 rdev = txdr_unsigned(vap->va_rdev); 1365 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1366 rdev = nfs_xdrneg1; 1367 else { 1368 return (EOPNOTSUPP); 1369 } 1370 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1371 return (error); 1372 } 1373 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1374 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1375 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1376 mb = mreq; 1377 bpos = mtod(mb, caddr_t); 1378 nfsm_fhtom(dvp, v3); 1379 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1380 if (v3) { 1381 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1382 *tl++ = vtonfsv3_type(vap->va_type); 1383 nfsm_v3attrbuild(vap, FALSE); 1384 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1385 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1386 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1387 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1388 } 1389 } else { 1390 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1391 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1392 sp->sa_uid = nfs_xdrneg1; 1393 sp->sa_gid = nfs_xdrneg1; 1394 sp->sa_size = rdev; 1395 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1396 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1397 } 1398 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1399 if (!error) { 1400 nfsm_mtofh(dvp, newvp, v3, gotvp); 1401 if (!gotvp) { 1402 if (newvp) { 1403 vput(newvp); 1404 newvp = NULL; 1405 } 1406 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1407 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1408 if (!error) 1409 newvp = NFSTOV(np); 1410 } 1411 } 1412 if (v3) 1413 nfsm_wcc_data(dvp, wccflag); 1414 m_freem(mrep); 1415 nfsmout: 1416 if (error) { 1417 if (newvp) 1418 vput(newvp); 1419 } else { 1420 if (cnp->cn_flags & MAKEENTRY) 1421 cache_enter(dvp, newvp, cnp); 1422 *vpp = newvp; 1423 } 1424 mtx_lock(&(VTONFS(dvp))->n_mtx); 1425 VTONFS(dvp)->n_flag |= NMODIFIED; 1426 if (!wccflag) 1427 VTONFS(dvp)->n_attrstamp = 0; 1428 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1429 return (error); 1430 } 1431 1432 /* 1433 * nfs mknod vop 1434 * just call nfs_mknodrpc() to do the work. 1435 */ 1436 /* ARGSUSED */ 1437 static int 1438 nfs_mknod(struct vop_mknod_args *ap) 1439 { 1440 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1441 } 1442 1443 static u_long create_verf; 1444 /* 1445 * nfs file create call 1446 */ 1447 static int 1448 nfs_create(struct vop_create_args *ap) 1449 { 1450 struct vnode *dvp = ap->a_dvp; 1451 struct vattr *vap = ap->a_vap; 1452 struct componentname *cnp = ap->a_cnp; 1453 struct nfsv2_sattr *sp; 1454 u_int32_t *tl; 1455 struct nfsnode *np = NULL; 1456 struct vnode *newvp = NULL; 1457 caddr_t bpos, dpos; 1458 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1459 struct mbuf *mreq, *mrep, *md, *mb; 1460 struct vattr vattr; 1461 int v3 = NFS_ISV3(dvp); 1462 1463 /* 1464 * Oops, not for me.. 1465 */ 1466 if (vap->va_type == VSOCK) 1467 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1468 1469 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1470 return (error); 1471 } 1472 if (vap->va_vaflags & VA_EXCLUSIVE) 1473 fmode |= O_EXCL; 1474 again: 1475 nfsstats.rpccnt[NFSPROC_CREATE]++; 1476 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1477 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1478 mb = mreq; 1479 bpos = mtod(mb, caddr_t); 1480 nfsm_fhtom(dvp, v3); 1481 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1482 if (v3) { 1483 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1484 if (fmode & O_EXCL) { 1485 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1486 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1487 #ifdef INET 1488 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1489 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1490 else 1491 #endif 1492 *tl++ = create_verf; 1493 *tl = ++create_verf; 1494 } else { 1495 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1496 nfsm_v3attrbuild(vap, FALSE); 1497 } 1498 } else { 1499 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1500 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1501 sp->sa_uid = nfs_xdrneg1; 1502 sp->sa_gid = nfs_xdrneg1; 1503 sp->sa_size = 0; 1504 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1505 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1506 } 1507 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1508 if (!error) { 1509 nfsm_mtofh(dvp, newvp, v3, gotvp); 1510 if (!gotvp) { 1511 if (newvp) { 1512 vput(newvp); 1513 newvp = NULL; 1514 } 1515 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1516 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1517 if (!error) 1518 newvp = NFSTOV(np); 1519 } 1520 } 1521 if (v3) 1522 nfsm_wcc_data(dvp, wccflag); 1523 m_freem(mrep); 1524 nfsmout: 1525 if (error) { 1526 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1527 fmode &= ~O_EXCL; 1528 goto again; 1529 } 1530 if (newvp) 1531 vput(newvp); 1532 } else if (v3 && (fmode & O_EXCL)) { 1533 /* 1534 * We are normally called with only a partially initialized 1535 * VAP. Since the NFSv3 spec says that server may use the 1536 * file attributes to store the verifier, the spec requires 1537 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1538 * in atime, but we can't really assume that all servers will 1539 * so we ensure that our SETATTR sets both atime and mtime. 1540 */ 1541 if (vap->va_mtime.tv_sec == VNOVAL) 1542 vfs_timestamp(&vap->va_mtime); 1543 if (vap->va_atime.tv_sec == VNOVAL) 1544 vap->va_atime = vap->va_mtime; 1545 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread); 1546 if (error) 1547 vput(newvp); 1548 } 1549 if (!error) { 1550 if (cnp->cn_flags & MAKEENTRY) 1551 cache_enter(dvp, newvp, cnp); 1552 *ap->a_vpp = newvp; 1553 } 1554 mtx_lock(&(VTONFS(dvp))->n_mtx); 1555 VTONFS(dvp)->n_flag |= NMODIFIED; 1556 if (!wccflag) 1557 VTONFS(dvp)->n_attrstamp = 0; 1558 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1559 return (error); 1560 } 1561 1562 /* 1563 * nfs file remove call 1564 * To try and make nfs semantics closer to ufs semantics, a file that has 1565 * other processes using the vnode is renamed instead of removed and then 1566 * removed later on the last close. 1567 * - If v_usecount > 1 1568 * If a rename is not already in the works 1569 * call nfs_sillyrename() to set it up 1570 * else 1571 * do the remove rpc 1572 */ 1573 static int 1574 nfs_remove(struct vop_remove_args *ap) 1575 { 1576 struct vnode *vp = ap->a_vp; 1577 struct vnode *dvp = ap->a_dvp; 1578 struct componentname *cnp = ap->a_cnp; 1579 struct nfsnode *np = VTONFS(vp); 1580 int error = 0; 1581 struct vattr vattr; 1582 1583 #ifndef DIAGNOSTIC 1584 if ((cnp->cn_flags & HASBUF) == 0) 1585 panic("nfs_remove: no name"); 1586 if (vrefcnt(vp) < 1) 1587 panic("nfs_remove: bad v_usecount"); 1588 #endif 1589 if (vp->v_type == VDIR) 1590 error = EPERM; 1591 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1592 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 && 1593 vattr.va_nlink > 1)) { 1594 /* 1595 * Purge the name cache so that the chance of a lookup for 1596 * the name succeeding while the remove is in progress is 1597 * minimized. Without node locking it can still happen, such 1598 * that an I/O op returns ESTALE, but since you get this if 1599 * another host removes the file.. 1600 */ 1601 cache_purge(vp); 1602 /* 1603 * throw away biocache buffers, mainly to avoid 1604 * unnecessary delayed writes later. 1605 */ 1606 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1607 /* Do the rpc */ 1608 if (error != EINTR && error != EIO) 1609 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1610 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1611 /* 1612 * Kludge City: If the first reply to the remove rpc is lost.. 1613 * the reply to the retransmitted request will be ENOENT 1614 * since the file was in fact removed 1615 * Therefore, we cheat and return success. 1616 */ 1617 if (error == ENOENT) 1618 error = 0; 1619 } else if (!np->n_sillyrename) 1620 error = nfs_sillyrename(dvp, vp, cnp); 1621 np->n_attrstamp = 0; 1622 return (error); 1623 } 1624 1625 /* 1626 * nfs file remove rpc called from nfs_inactive 1627 */ 1628 int 1629 nfs_removeit(struct sillyrename *sp) 1630 { 1631 /* 1632 * Make sure that the directory vnode is still valid. 1633 * XXX we should lock sp->s_dvp here. 1634 */ 1635 if (sp->s_dvp->v_type == VBAD) 1636 return (0); 1637 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1638 NULL)); 1639 } 1640 1641 /* 1642 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1643 */ 1644 static int 1645 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1646 struct ucred *cred, struct thread *td) 1647 { 1648 caddr_t bpos, dpos; 1649 int error = 0, wccflag = NFSV3_WCCRATTR; 1650 struct mbuf *mreq, *mrep, *md, *mb; 1651 int v3 = NFS_ISV3(dvp); 1652 1653 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1654 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1655 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1656 mb = mreq; 1657 bpos = mtod(mb, caddr_t); 1658 nfsm_fhtom(dvp, v3); 1659 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1660 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1661 if (v3) 1662 nfsm_wcc_data(dvp, wccflag); 1663 m_freem(mrep); 1664 nfsmout: 1665 mtx_lock(&(VTONFS(dvp))->n_mtx); 1666 VTONFS(dvp)->n_flag |= NMODIFIED; 1667 if (!wccflag) 1668 VTONFS(dvp)->n_attrstamp = 0; 1669 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1670 return (error); 1671 } 1672 1673 /* 1674 * nfs file rename call 1675 */ 1676 static int 1677 nfs_rename(struct vop_rename_args *ap) 1678 { 1679 struct vnode *fvp = ap->a_fvp; 1680 struct vnode *tvp = ap->a_tvp; 1681 struct vnode *fdvp = ap->a_fdvp; 1682 struct vnode *tdvp = ap->a_tdvp; 1683 struct componentname *tcnp = ap->a_tcnp; 1684 struct componentname *fcnp = ap->a_fcnp; 1685 int error; 1686 1687 #ifndef DIAGNOSTIC 1688 if ((tcnp->cn_flags & HASBUF) == 0 || 1689 (fcnp->cn_flags & HASBUF) == 0) 1690 panic("nfs_rename: no name"); 1691 #endif 1692 /* Check for cross-device rename */ 1693 if ((fvp->v_mount != tdvp->v_mount) || 1694 (tvp && (fvp->v_mount != tvp->v_mount))) { 1695 error = EXDEV; 1696 goto out; 1697 } 1698 1699 if (fvp == tvp) { 1700 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1701 error = 0; 1702 goto out; 1703 } 1704 if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0) 1705 goto out; 1706 1707 /* 1708 * We have to flush B_DELWRI data prior to renaming 1709 * the file. If we don't, the delayed-write buffers 1710 * can be flushed out later after the file has gone stale 1711 * under NFSV3. NFSV2 does not have this problem because 1712 * ( as far as I can tell ) it flushes dirty buffers more 1713 * often. 1714 * 1715 * Skip the rename operation if the fsync fails, this can happen 1716 * due to the server's volume being full, when we pushed out data 1717 * that was written back to our cache earlier. Not checking for 1718 * this condition can result in potential (silent) data loss. 1719 */ 1720 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1721 VOP_UNLOCK(fvp, 0, fcnp->cn_thread); 1722 if (!error && tvp) 1723 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1724 if (error) 1725 goto out; 1726 1727 /* 1728 * If the tvp exists and is in use, sillyrename it before doing the 1729 * rename of the new file over it. 1730 * XXX Can't sillyrename a directory. 1731 */ 1732 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1733 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1734 vput(tvp); 1735 tvp = NULL; 1736 } 1737 1738 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1739 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1740 tcnp->cn_thread); 1741 1742 if (fvp->v_type == VDIR) { 1743 if (tvp != NULL && tvp->v_type == VDIR) 1744 cache_purge(tdvp); 1745 cache_purge(fdvp); 1746 } 1747 1748 out: 1749 if (tdvp == tvp) 1750 vrele(tdvp); 1751 else 1752 vput(tdvp); 1753 if (tvp) 1754 vput(tvp); 1755 vrele(fdvp); 1756 vrele(fvp); 1757 /* 1758 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1759 */ 1760 if (error == ENOENT) 1761 error = 0; 1762 return (error); 1763 } 1764 1765 /* 1766 * nfs file rename rpc called from nfs_remove() above 1767 */ 1768 static int 1769 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1770 struct sillyrename *sp) 1771 { 1772 1773 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1774 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1775 } 1776 1777 /* 1778 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1779 */ 1780 static int 1781 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1782 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1783 struct thread *td) 1784 { 1785 caddr_t bpos, dpos; 1786 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1787 struct mbuf *mreq, *mrep, *md, *mb; 1788 int v3 = NFS_ISV3(fdvp); 1789 1790 nfsstats.rpccnt[NFSPROC_RENAME]++; 1791 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1792 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1793 nfsm_rndup(tnamelen)); 1794 mb = mreq; 1795 bpos = mtod(mb, caddr_t); 1796 nfsm_fhtom(fdvp, v3); 1797 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1798 nfsm_fhtom(tdvp, v3); 1799 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1800 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1801 if (v3) { 1802 nfsm_wcc_data(fdvp, fwccflag); 1803 nfsm_wcc_data(tdvp, twccflag); 1804 } 1805 m_freem(mrep); 1806 nfsmout: 1807 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1808 VTONFS(fdvp)->n_flag |= NMODIFIED; 1809 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1810 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1811 VTONFS(tdvp)->n_flag |= NMODIFIED; 1812 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1813 if (!fwccflag) 1814 VTONFS(fdvp)->n_attrstamp = 0; 1815 if (!twccflag) 1816 VTONFS(tdvp)->n_attrstamp = 0; 1817 return (error); 1818 } 1819 1820 /* 1821 * nfs hard link create call 1822 */ 1823 static int 1824 nfs_link(struct vop_link_args *ap) 1825 { 1826 struct vnode *vp = ap->a_vp; 1827 struct vnode *tdvp = ap->a_tdvp; 1828 struct componentname *cnp = ap->a_cnp; 1829 caddr_t bpos, dpos; 1830 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1831 struct mbuf *mreq, *mrep, *md, *mb; 1832 int v3; 1833 1834 if (vp->v_mount != tdvp->v_mount) { 1835 return (EXDEV); 1836 } 1837 1838 /* 1839 * Push all writes to the server, so that the attribute cache 1840 * doesn't get "out of sync" with the server. 1841 * XXX There should be a better way! 1842 */ 1843 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1844 1845 v3 = NFS_ISV3(vp); 1846 nfsstats.rpccnt[NFSPROC_LINK]++; 1847 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1848 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1849 mb = mreq; 1850 bpos = mtod(mb, caddr_t); 1851 nfsm_fhtom(vp, v3); 1852 nfsm_fhtom(tdvp, v3); 1853 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1854 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1855 if (v3) { 1856 nfsm_postop_attr(vp, attrflag); 1857 nfsm_wcc_data(tdvp, wccflag); 1858 } 1859 m_freem(mrep); 1860 nfsmout: 1861 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1862 VTONFS(tdvp)->n_flag |= NMODIFIED; 1863 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1864 if (!attrflag) 1865 VTONFS(vp)->n_attrstamp = 0; 1866 if (!wccflag) 1867 VTONFS(tdvp)->n_attrstamp = 0; 1868 return (error); 1869 } 1870 1871 /* 1872 * nfs symbolic link create call 1873 */ 1874 static int 1875 nfs_symlink(struct vop_symlink_args *ap) 1876 { 1877 struct vnode *dvp = ap->a_dvp; 1878 struct vattr *vap = ap->a_vap; 1879 struct componentname *cnp = ap->a_cnp; 1880 struct nfsv2_sattr *sp; 1881 caddr_t bpos, dpos; 1882 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1883 struct mbuf *mreq, *mrep, *md, *mb; 1884 struct vnode *newvp = NULL; 1885 int v3 = NFS_ISV3(dvp); 1886 1887 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1888 slen = strlen(ap->a_target); 1889 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1890 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1891 mb = mreq; 1892 bpos = mtod(mb, caddr_t); 1893 nfsm_fhtom(dvp, v3); 1894 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1895 if (v3) { 1896 nfsm_v3attrbuild(vap, FALSE); 1897 } 1898 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1899 if (!v3) { 1900 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1901 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1902 sp->sa_uid = nfs_xdrneg1; 1903 sp->sa_gid = nfs_xdrneg1; 1904 sp->sa_size = nfs_xdrneg1; 1905 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1906 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1907 } 1908 1909 /* 1910 * Issue the NFS request and get the rpc response. 1911 * 1912 * Only NFSv3 responses returning an error of 0 actually return 1913 * a file handle that can be converted into newvp without having 1914 * to do an extra lookup rpc. 1915 */ 1916 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 1917 if (v3) { 1918 if (error == 0) 1919 nfsm_mtofh(dvp, newvp, v3, gotvp); 1920 nfsm_wcc_data(dvp, wccflag); 1921 } 1922 1923 /* 1924 * out code jumps -> here, mrep is also freed. 1925 */ 1926 1927 m_freem(mrep); 1928 nfsmout: 1929 1930 /* 1931 * If we do not have an error and we could not extract the newvp from 1932 * the response due to the request being NFSv2, we have to do a 1933 * lookup in order to obtain a newvp to return. 1934 */ 1935 if (error == 0 && newvp == NULL) { 1936 struct nfsnode *np = NULL; 1937 1938 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1939 cnp->cn_cred, cnp->cn_thread, &np); 1940 if (!error) 1941 newvp = NFSTOV(np); 1942 } 1943 if (error) { 1944 if (newvp) 1945 vput(newvp); 1946 } else { 1947 *ap->a_vpp = newvp; 1948 } 1949 mtx_lock(&(VTONFS(dvp))->n_mtx); 1950 VTONFS(dvp)->n_flag |= NMODIFIED; 1951 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1952 if (!wccflag) 1953 VTONFS(dvp)->n_attrstamp = 0; 1954 return (error); 1955 } 1956 1957 /* 1958 * nfs make dir call 1959 */ 1960 static int 1961 nfs_mkdir(struct vop_mkdir_args *ap) 1962 { 1963 struct vnode *dvp = ap->a_dvp; 1964 struct vattr *vap = ap->a_vap; 1965 struct componentname *cnp = ap->a_cnp; 1966 struct nfsv2_sattr *sp; 1967 int len; 1968 struct nfsnode *np = NULL; 1969 struct vnode *newvp = NULL; 1970 caddr_t bpos, dpos; 1971 int error = 0, wccflag = NFSV3_WCCRATTR; 1972 int gotvp = 0; 1973 struct mbuf *mreq, *mrep, *md, *mb; 1974 struct vattr vattr; 1975 int v3 = NFS_ISV3(dvp); 1976 1977 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1978 return (error); 1979 } 1980 len = cnp->cn_namelen; 1981 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1982 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 1983 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1984 mb = mreq; 1985 bpos = mtod(mb, caddr_t); 1986 nfsm_fhtom(dvp, v3); 1987 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1988 if (v3) { 1989 nfsm_v3attrbuild(vap, FALSE); 1990 } else { 1991 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1992 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1993 sp->sa_uid = nfs_xdrneg1; 1994 sp->sa_gid = nfs_xdrneg1; 1995 sp->sa_size = nfs_xdrneg1; 1996 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1997 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1998 } 1999 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2000 if (!error) 2001 nfsm_mtofh(dvp, newvp, v3, gotvp); 2002 if (v3) 2003 nfsm_wcc_data(dvp, wccflag); 2004 m_freem(mrep); 2005 nfsmout: 2006 mtx_lock(&(VTONFS(dvp))->n_mtx); 2007 VTONFS(dvp)->n_flag |= NMODIFIED; 2008 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2009 if (!wccflag) 2010 VTONFS(dvp)->n_attrstamp = 0; 2011 if (error == 0 && newvp == NULL) { 2012 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2013 cnp->cn_thread, &np); 2014 if (!error) { 2015 newvp = NFSTOV(np); 2016 if (newvp->v_type != VDIR) 2017 error = EEXIST; 2018 } 2019 } 2020 if (error) { 2021 if (newvp) 2022 vput(newvp); 2023 } else 2024 *ap->a_vpp = newvp; 2025 return (error); 2026 } 2027 2028 /* 2029 * nfs remove directory call 2030 */ 2031 static int 2032 nfs_rmdir(struct vop_rmdir_args *ap) 2033 { 2034 struct vnode *vp = ap->a_vp; 2035 struct vnode *dvp = ap->a_dvp; 2036 struct componentname *cnp = ap->a_cnp; 2037 caddr_t bpos, dpos; 2038 int error = 0, wccflag = NFSV3_WCCRATTR; 2039 struct mbuf *mreq, *mrep, *md, *mb; 2040 int v3 = NFS_ISV3(dvp); 2041 2042 if (dvp == vp) 2043 return (EINVAL); 2044 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2045 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 2046 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2047 mb = mreq; 2048 bpos = mtod(mb, caddr_t); 2049 nfsm_fhtom(dvp, v3); 2050 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2051 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2052 if (v3) 2053 nfsm_wcc_data(dvp, wccflag); 2054 m_freem(mrep); 2055 nfsmout: 2056 mtx_lock(&(VTONFS(dvp))->n_mtx); 2057 VTONFS(dvp)->n_flag |= NMODIFIED; 2058 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2059 if (!wccflag) 2060 VTONFS(dvp)->n_attrstamp = 0; 2061 cache_purge(dvp); 2062 cache_purge(vp); 2063 /* 2064 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2065 */ 2066 if (error == ENOENT) 2067 error = 0; 2068 return (error); 2069 } 2070 2071 /* 2072 * nfs readdir call 2073 */ 2074 static int 2075 nfs_readdir(struct vop_readdir_args *ap) 2076 { 2077 struct vnode *vp = ap->a_vp; 2078 struct nfsnode *np = VTONFS(vp); 2079 struct uio *uio = ap->a_uio; 2080 int tresid, error = 0; 2081 struct vattr vattr; 2082 2083 if (vp->v_type != VDIR) 2084 return(EPERM); 2085 2086 /* 2087 * First, check for hit on the EOF offset cache 2088 */ 2089 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2090 (np->n_flag & NMODIFIED) == 0) { 2091 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0) { 2092 mtx_lock(&np->n_mtx); 2093 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2094 mtx_unlock(&np->n_mtx); 2095 nfsstats.direofcache_hits++; 2096 goto out; 2097 } else 2098 mtx_unlock(&np->n_mtx); 2099 } 2100 } 2101 2102 /* 2103 * Call nfs_bioread() to do the real work. 2104 */ 2105 tresid = uio->uio_resid; 2106 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2107 2108 if (!error && uio->uio_resid == tresid) { 2109 nfsstats.direofcache_misses++; 2110 } 2111 out: 2112 return (error); 2113 } 2114 2115 /* 2116 * Readdir rpc call. 2117 * Called from below the buffer cache by nfs_doio(). 2118 */ 2119 int 2120 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2121 { 2122 int len, left; 2123 struct dirent *dp = NULL; 2124 u_int32_t *tl; 2125 caddr_t cp; 2126 nfsuint64 *cookiep; 2127 caddr_t bpos, dpos; 2128 struct mbuf *mreq, *mrep, *md, *mb; 2129 nfsuint64 cookie; 2130 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2131 struct nfsnode *dnp = VTONFS(vp); 2132 u_quad_t fileno; 2133 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2134 int attrflag; 2135 int v3 = NFS_ISV3(vp); 2136 2137 #ifndef DIAGNOSTIC 2138 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2139 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2140 panic("nfs readdirrpc bad uio"); 2141 #endif 2142 2143 /* 2144 * If there is no cookie, assume directory was stale. 2145 */ 2146 nfs_dircookie_lock(dnp); 2147 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2148 if (cookiep) { 2149 cookie = *cookiep; 2150 nfs_dircookie_unlock(dnp); 2151 } else { 2152 nfs_dircookie_unlock(dnp); 2153 return (NFSERR_BAD_COOKIE); 2154 } 2155 2156 /* 2157 * Loop around doing readdir rpc's of size nm_readdirsize 2158 * truncated to a multiple of DIRBLKSIZ. 2159 * The stopping criteria is EOF or buffer full. 2160 */ 2161 while (more_dirs && bigenough) { 2162 nfsstats.rpccnt[NFSPROC_READDIR]++; 2163 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2164 NFSX_READDIR(v3)); 2165 mb = mreq; 2166 bpos = mtod(mb, caddr_t); 2167 nfsm_fhtom(vp, v3); 2168 if (v3) { 2169 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2170 *tl++ = cookie.nfsuquad[0]; 2171 *tl++ = cookie.nfsuquad[1]; 2172 mtx_lock(&dnp->n_mtx); 2173 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2174 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2175 mtx_unlock(&dnp->n_mtx); 2176 } else { 2177 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2178 *tl++ = cookie.nfsuquad[0]; 2179 } 2180 *tl = txdr_unsigned(nmp->nm_readdirsize); 2181 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2182 if (v3) { 2183 nfsm_postop_attr(vp, attrflag); 2184 if (!error) { 2185 tl = nfsm_dissect(u_int32_t *, 2186 2 * NFSX_UNSIGNED); 2187 mtx_lock(&dnp->n_mtx); 2188 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2189 dnp->n_cookieverf.nfsuquad[1] = *tl; 2190 mtx_unlock(&dnp->n_mtx); 2191 } else { 2192 m_freem(mrep); 2193 goto nfsmout; 2194 } 2195 } 2196 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2197 more_dirs = fxdr_unsigned(int, *tl); 2198 2199 /* loop thru the dir entries, doctoring them to 4bsd form */ 2200 while (more_dirs && bigenough) { 2201 if (v3) { 2202 tl = nfsm_dissect(u_int32_t *, 2203 3 * NFSX_UNSIGNED); 2204 fileno = fxdr_hyper(tl); 2205 len = fxdr_unsigned(int, *(tl + 2)); 2206 } else { 2207 tl = nfsm_dissect(u_int32_t *, 2208 2 * NFSX_UNSIGNED); 2209 fileno = fxdr_unsigned(u_quad_t, *tl++); 2210 len = fxdr_unsigned(int, *tl); 2211 } 2212 if (len <= 0 || len > NFS_MAXNAMLEN) { 2213 error = EBADRPC; 2214 m_freem(mrep); 2215 goto nfsmout; 2216 } 2217 tlen = nfsm_rndup(len); 2218 if (tlen == len) 2219 tlen += 4; /* To ensure null termination */ 2220 left = DIRBLKSIZ - blksiz; 2221 if ((tlen + DIRHDSIZ) > left) { 2222 dp->d_reclen += left; 2223 uiop->uio_iov->iov_base = 2224 (char *)uiop->uio_iov->iov_base + left; 2225 uiop->uio_iov->iov_len -= left; 2226 uiop->uio_offset += left; 2227 uiop->uio_resid -= left; 2228 blksiz = 0; 2229 } 2230 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2231 bigenough = 0; 2232 if (bigenough) { 2233 dp = (struct dirent *)uiop->uio_iov->iov_base; 2234 dp->d_fileno = (int)fileno; 2235 dp->d_namlen = len; 2236 dp->d_reclen = tlen + DIRHDSIZ; 2237 dp->d_type = DT_UNKNOWN; 2238 blksiz += dp->d_reclen; 2239 if (blksiz == DIRBLKSIZ) 2240 blksiz = 0; 2241 uiop->uio_offset += DIRHDSIZ; 2242 uiop->uio_resid -= DIRHDSIZ; 2243 uiop->uio_iov->iov_base = 2244 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2245 uiop->uio_iov->iov_len -= DIRHDSIZ; 2246 nfsm_mtouio(uiop, len); 2247 cp = uiop->uio_iov->iov_base; 2248 tlen -= len; 2249 *cp = '\0'; /* null terminate */ 2250 uiop->uio_iov->iov_base = 2251 (char *)uiop->uio_iov->iov_base + tlen; 2252 uiop->uio_iov->iov_len -= tlen; 2253 uiop->uio_offset += tlen; 2254 uiop->uio_resid -= tlen; 2255 } else 2256 nfsm_adv(nfsm_rndup(len)); 2257 if (v3) { 2258 tl = nfsm_dissect(u_int32_t *, 2259 3 * NFSX_UNSIGNED); 2260 } else { 2261 tl = nfsm_dissect(u_int32_t *, 2262 2 * NFSX_UNSIGNED); 2263 } 2264 if (bigenough) { 2265 cookie.nfsuquad[0] = *tl++; 2266 if (v3) 2267 cookie.nfsuquad[1] = *tl++; 2268 } else if (v3) 2269 tl += 2; 2270 else 2271 tl++; 2272 more_dirs = fxdr_unsigned(int, *tl); 2273 } 2274 /* 2275 * If at end of rpc data, get the eof boolean 2276 */ 2277 if (!more_dirs) { 2278 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2279 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2280 } 2281 m_freem(mrep); 2282 } 2283 /* 2284 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2285 * by increasing d_reclen for the last record. 2286 */ 2287 if (blksiz > 0) { 2288 left = DIRBLKSIZ - blksiz; 2289 dp->d_reclen += left; 2290 uiop->uio_iov->iov_base = 2291 (char *)uiop->uio_iov->iov_base + left; 2292 uiop->uio_iov->iov_len -= left; 2293 uiop->uio_offset += left; 2294 uiop->uio_resid -= left; 2295 } 2296 2297 /* 2298 * We are now either at the end of the directory or have filled the 2299 * block. 2300 */ 2301 if (bigenough) 2302 dnp->n_direofoffset = uiop->uio_offset; 2303 else { 2304 if (uiop->uio_resid > 0) 2305 nfs_printf("EEK! readdirrpc resid > 0\n"); 2306 nfs_dircookie_lock(dnp); 2307 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2308 *cookiep = cookie; 2309 nfs_dircookie_unlock(dnp); 2310 } 2311 nfsmout: 2312 return (error); 2313 } 2314 2315 /* 2316 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2317 */ 2318 int 2319 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2320 { 2321 int len, left; 2322 struct dirent *dp; 2323 u_int32_t *tl; 2324 caddr_t cp; 2325 struct vnode *newvp; 2326 nfsuint64 *cookiep; 2327 caddr_t bpos, dpos, dpossav1, dpossav2; 2328 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2329 struct nameidata nami, *ndp = &nami; 2330 struct componentname *cnp = &ndp->ni_cnd; 2331 nfsuint64 cookie; 2332 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2333 struct nfsnode *dnp = VTONFS(vp), *np; 2334 nfsfh_t *fhp; 2335 u_quad_t fileno; 2336 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2337 int attrflag, fhsize; 2338 2339 #ifndef nolint 2340 dp = NULL; 2341 #endif 2342 #ifndef DIAGNOSTIC 2343 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2344 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2345 panic("nfs readdirplusrpc bad uio"); 2346 #endif 2347 ndp->ni_dvp = vp; 2348 newvp = NULLVP; 2349 2350 /* 2351 * If there is no cookie, assume directory was stale. 2352 */ 2353 nfs_dircookie_lock(dnp); 2354 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2355 if (cookiep) { 2356 cookie = *cookiep; 2357 nfs_dircookie_unlock(dnp); 2358 } else { 2359 nfs_dircookie_unlock(dnp); 2360 return (NFSERR_BAD_COOKIE); 2361 } 2362 /* 2363 * Loop around doing readdir rpc's of size nm_readdirsize 2364 * truncated to a multiple of DIRBLKSIZ. 2365 * The stopping criteria is EOF or buffer full. 2366 */ 2367 while (more_dirs && bigenough) { 2368 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2369 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2370 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2371 mb = mreq; 2372 bpos = mtod(mb, caddr_t); 2373 nfsm_fhtom(vp, 1); 2374 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2375 *tl++ = cookie.nfsuquad[0]; 2376 *tl++ = cookie.nfsuquad[1]; 2377 mtx_lock(&dnp->n_mtx); 2378 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2379 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2380 mtx_unlock(&dnp->n_mtx); 2381 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2382 *tl = txdr_unsigned(nmp->nm_rsize); 2383 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2384 nfsm_postop_attr(vp, attrflag); 2385 if (error) { 2386 m_freem(mrep); 2387 goto nfsmout; 2388 } 2389 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2390 mtx_lock(&dnp->n_mtx); 2391 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2392 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2393 mtx_unlock(&dnp->n_mtx); 2394 more_dirs = fxdr_unsigned(int, *tl); 2395 2396 /* loop thru the dir entries, doctoring them to 4bsd form */ 2397 while (more_dirs && bigenough) { 2398 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2399 fileno = fxdr_hyper(tl); 2400 len = fxdr_unsigned(int, *(tl + 2)); 2401 if (len <= 0 || len > NFS_MAXNAMLEN) { 2402 error = EBADRPC; 2403 m_freem(mrep); 2404 goto nfsmout; 2405 } 2406 tlen = nfsm_rndup(len); 2407 if (tlen == len) 2408 tlen += 4; /* To ensure null termination*/ 2409 left = DIRBLKSIZ - blksiz; 2410 if ((tlen + DIRHDSIZ) > left) { 2411 dp->d_reclen += left; 2412 uiop->uio_iov->iov_base = 2413 (char *)uiop->uio_iov->iov_base + left; 2414 uiop->uio_iov->iov_len -= left; 2415 uiop->uio_offset += left; 2416 uiop->uio_resid -= left; 2417 blksiz = 0; 2418 } 2419 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2420 bigenough = 0; 2421 if (bigenough) { 2422 dp = (struct dirent *)uiop->uio_iov->iov_base; 2423 dp->d_fileno = (int)fileno; 2424 dp->d_namlen = len; 2425 dp->d_reclen = tlen + DIRHDSIZ; 2426 dp->d_type = DT_UNKNOWN; 2427 blksiz += dp->d_reclen; 2428 if (blksiz == DIRBLKSIZ) 2429 blksiz = 0; 2430 uiop->uio_offset += DIRHDSIZ; 2431 uiop->uio_resid -= DIRHDSIZ; 2432 uiop->uio_iov->iov_base = 2433 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2434 uiop->uio_iov->iov_len -= DIRHDSIZ; 2435 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2436 cnp->cn_namelen = len; 2437 nfsm_mtouio(uiop, len); 2438 cp = uiop->uio_iov->iov_base; 2439 tlen -= len; 2440 *cp = '\0'; 2441 uiop->uio_iov->iov_base = 2442 (char *)uiop->uio_iov->iov_base + tlen; 2443 uiop->uio_iov->iov_len -= tlen; 2444 uiop->uio_offset += tlen; 2445 uiop->uio_resid -= tlen; 2446 } else 2447 nfsm_adv(nfsm_rndup(len)); 2448 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2449 if (bigenough) { 2450 cookie.nfsuquad[0] = *tl++; 2451 cookie.nfsuquad[1] = *tl++; 2452 } else 2453 tl += 2; 2454 2455 /* 2456 * Since the attributes are before the file handle 2457 * (sigh), we must skip over the attributes and then 2458 * come back and get them. 2459 */ 2460 attrflag = fxdr_unsigned(int, *tl); 2461 if (attrflag) { 2462 dpossav1 = dpos; 2463 mdsav1 = md; 2464 nfsm_adv(NFSX_V3FATTR); 2465 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2466 doit = fxdr_unsigned(int, *tl); 2467 /* 2468 * Skip loading the attrs for "..". There's a 2469 * race between loading the attrs here and 2470 * lookups that look for the directory currently 2471 * being read (in the parent). We try to acquire 2472 * the exclusive lock on ".." here, owning the 2473 * lock on the directory being read. Lookup will 2474 * hold the lock on ".." and try to acquire the 2475 * lock on the directory being read. 2476 * 2477 * There are other ways of fixing this, one would 2478 * be to do a trylock on the ".." vnode and skip 2479 * loading the attrs on ".." if it happens to be 2480 * locked by another process. But skipping the 2481 * attrload on ".." seems the easiest option. 2482 */ 2483 if (strcmp(dp->d_name, "..") == 0) { 2484 doit = 0; 2485 /* 2486 * We've already skipped over the attrs, 2487 * skip over the filehandle. And store d_type 2488 * as VDIR. 2489 */ 2490 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2491 i = fxdr_unsigned(int, *tl); 2492 nfsm_adv(nfsm_rndup(i)); 2493 dp->d_type = IFTODT(VTTOIF(VDIR)); 2494 } 2495 if (doit) { 2496 nfsm_getfh(fhp, fhsize, 1); 2497 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2498 VREF(vp); 2499 newvp = vp; 2500 np = dnp; 2501 } else { 2502 error = nfs_nget(vp->v_mount, fhp, 2503 fhsize, &np, LK_EXCLUSIVE); 2504 if (error) 2505 doit = 0; 2506 else 2507 newvp = NFSTOV(np); 2508 } 2509 } 2510 if (doit && bigenough) { 2511 dpossav2 = dpos; 2512 dpos = dpossav1; 2513 mdsav2 = md; 2514 md = mdsav1; 2515 nfsm_loadattr(newvp, NULL); 2516 dpos = dpossav2; 2517 md = mdsav2; 2518 dp->d_type = 2519 IFTODT(VTTOIF(np->n_vattr.va_type)); 2520 ndp->ni_vp = newvp; 2521 /* Update n_ctime, so subsequent lookup doesn't purge entry */ 2522 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 2523 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2524 } 2525 } else { 2526 /* Just skip over the file handle */ 2527 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2528 i = fxdr_unsigned(int, *tl); 2529 if (i) { 2530 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2531 fhsize = fxdr_unsigned(int, *tl); 2532 nfsm_adv(nfsm_rndup(fhsize)); 2533 } 2534 } 2535 if (newvp != NULLVP) { 2536 if (newvp == vp) 2537 vrele(newvp); 2538 else 2539 vput(newvp); 2540 newvp = NULLVP; 2541 } 2542 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2543 more_dirs = fxdr_unsigned(int, *tl); 2544 } 2545 /* 2546 * If at end of rpc data, get the eof boolean 2547 */ 2548 if (!more_dirs) { 2549 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2550 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2551 } 2552 m_freem(mrep); 2553 } 2554 /* 2555 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2556 * by increasing d_reclen for the last record. 2557 */ 2558 if (blksiz > 0) { 2559 left = DIRBLKSIZ - blksiz; 2560 dp->d_reclen += left; 2561 uiop->uio_iov->iov_base = 2562 (char *)uiop->uio_iov->iov_base + left; 2563 uiop->uio_iov->iov_len -= left; 2564 uiop->uio_offset += left; 2565 uiop->uio_resid -= left; 2566 } 2567 2568 /* 2569 * We are now either at the end of the directory or have filled the 2570 * block. 2571 */ 2572 if (bigenough) 2573 dnp->n_direofoffset = uiop->uio_offset; 2574 else { 2575 if (uiop->uio_resid > 0) 2576 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2577 nfs_dircookie_lock(dnp); 2578 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2579 *cookiep = cookie; 2580 nfs_dircookie_unlock(dnp); 2581 } 2582 nfsmout: 2583 if (newvp != NULLVP) { 2584 if (newvp == vp) 2585 vrele(newvp); 2586 else 2587 vput(newvp); 2588 newvp = NULLVP; 2589 } 2590 return (error); 2591 } 2592 2593 /* 2594 * Silly rename. To make the NFS filesystem that is stateless look a little 2595 * more like the "ufs" a remove of an active vnode is translated to a rename 2596 * to a funny looking filename that is removed by nfs_inactive on the 2597 * nfsnode. There is the potential for another process on a different client 2598 * to create the same funny name between the nfs_lookitup() fails and the 2599 * nfs_rename() completes, but... 2600 */ 2601 static int 2602 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2603 { 2604 struct sillyrename *sp; 2605 struct nfsnode *np; 2606 int error; 2607 short pid; 2608 unsigned int lticks; 2609 2610 cache_purge(dvp); 2611 np = VTONFS(vp); 2612 #ifndef DIAGNOSTIC 2613 if (vp->v_type == VDIR) 2614 panic("nfs: sillyrename dir"); 2615 #endif 2616 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2617 M_NFSREQ, M_WAITOK); 2618 sp->s_cred = crhold(cnp->cn_cred); 2619 sp->s_dvp = dvp; 2620 sp->s_removeit = nfs_removeit; 2621 VREF(dvp); 2622 2623 /* 2624 * Fudge together a funny name. 2625 * Changing the format of the funny name to accomodate more 2626 * sillynames per directory. 2627 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2628 * CPU ticks since boot. 2629 */ 2630 pid = cnp->cn_thread->td_proc->p_pid; 2631 lticks = (unsigned int)ticks; 2632 for ( ; ; ) { 2633 sp->s_namlen = sprintf(sp->s_name, 2634 ".nfs.%08x.%04x4.4", lticks, 2635 pid); 2636 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2637 cnp->cn_thread, NULL)) 2638 break; 2639 lticks++; 2640 } 2641 error = nfs_renameit(dvp, cnp, sp); 2642 if (error) 2643 goto bad; 2644 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2645 cnp->cn_thread, &np); 2646 np->n_sillyrename = sp; 2647 return (0); 2648 bad: 2649 vrele(sp->s_dvp); 2650 crfree(sp->s_cred); 2651 free((caddr_t)sp, M_NFSREQ); 2652 return (error); 2653 } 2654 2655 /* 2656 * Look up a file name and optionally either update the file handle or 2657 * allocate an nfsnode, depending on the value of npp. 2658 * npp == NULL --> just do the lookup 2659 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2660 * handled too 2661 * *npp != NULL --> update the file handle in the vnode 2662 */ 2663 static int 2664 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2665 struct thread *td, struct nfsnode **npp) 2666 { 2667 struct vnode *newvp = NULL; 2668 struct nfsnode *np, *dnp = VTONFS(dvp); 2669 caddr_t bpos, dpos; 2670 int error = 0, fhlen, attrflag; 2671 struct mbuf *mreq, *mrep, *md, *mb; 2672 nfsfh_t *nfhp; 2673 int v3 = NFS_ISV3(dvp); 2674 2675 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2676 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2677 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2678 mb = mreq; 2679 bpos = mtod(mb, caddr_t); 2680 nfsm_fhtom(dvp, v3); 2681 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2682 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2683 if (npp && !error) { 2684 nfsm_getfh(nfhp, fhlen, v3); 2685 if (*npp) { 2686 np = *npp; 2687 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2688 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2689 np->n_fhp = &np->n_fh; 2690 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2691 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2692 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2693 np->n_fhsize = fhlen; 2694 newvp = NFSTOV(np); 2695 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2696 VREF(dvp); 2697 newvp = dvp; 2698 } else { 2699 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2700 if (error) { 2701 m_freem(mrep); 2702 return (error); 2703 } 2704 newvp = NFSTOV(np); 2705 } 2706 if (v3) { 2707 nfsm_postop_attr(newvp, attrflag); 2708 if (!attrflag && *npp == NULL) { 2709 m_freem(mrep); 2710 if (newvp == dvp) 2711 vrele(newvp); 2712 else 2713 vput(newvp); 2714 return (ENOENT); 2715 } 2716 } else 2717 nfsm_loadattr(newvp, NULL); 2718 } 2719 m_freem(mrep); 2720 nfsmout: 2721 if (npp && *npp == NULL) { 2722 if (error) { 2723 if (newvp) { 2724 if (newvp == dvp) 2725 vrele(newvp); 2726 else 2727 vput(newvp); 2728 } 2729 } else 2730 *npp = np; 2731 } 2732 return (error); 2733 } 2734 2735 /* 2736 * Nfs Version 3 commit rpc 2737 */ 2738 int 2739 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2740 struct thread *td) 2741 { 2742 u_int32_t *tl; 2743 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2744 caddr_t bpos, dpos; 2745 int error = 0, wccflag = NFSV3_WCCRATTR; 2746 struct mbuf *mreq, *mrep, *md, *mb; 2747 2748 mtx_lock(&nmp->nm_mtx); 2749 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2750 mtx_unlock(&nmp->nm_mtx); 2751 return (0); 2752 } 2753 mtx_unlock(&nmp->nm_mtx); 2754 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2755 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2756 mb = mreq; 2757 bpos = mtod(mb, caddr_t); 2758 nfsm_fhtom(vp, 1); 2759 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2760 txdr_hyper(offset, tl); 2761 tl += 2; 2762 *tl = txdr_unsigned(cnt); 2763 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2764 nfsm_wcc_data(vp, wccflag); 2765 if (!error) { 2766 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2767 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2768 NFSX_V3WRITEVERF)) { 2769 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2770 NFSX_V3WRITEVERF); 2771 error = NFSERR_STALEWRITEVERF; 2772 } 2773 } 2774 m_freem(mrep); 2775 nfsmout: 2776 return (error); 2777 } 2778 2779 /* 2780 * Strategy routine. 2781 * For async requests when nfsiod(s) are running, queue the request by 2782 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2783 * request. 2784 */ 2785 static int 2786 nfs_strategy(struct vop_strategy_args *ap) 2787 { 2788 struct buf *bp = ap->a_bp; 2789 struct ucred *cr; 2790 2791 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2792 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2793 2794 if (bp->b_iocmd == BIO_READ) 2795 cr = bp->b_rcred; 2796 else 2797 cr = bp->b_wcred; 2798 2799 /* 2800 * If the op is asynchronous and an i/o daemon is waiting 2801 * queue the request, wake it up and wait for completion 2802 * otherwise just do it ourselves. 2803 */ 2804 if ((bp->b_flags & B_ASYNC) == 0 || 2805 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2806 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2807 return (0); 2808 } 2809 2810 /* 2811 * fsync vnode op. Just call nfs_flush() with commit == 1. 2812 */ 2813 /* ARGSUSED */ 2814 static int 2815 nfs_fsync(struct vop_fsync_args *ap) 2816 { 2817 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2818 } 2819 2820 /* 2821 * Flush all the blocks associated with a vnode. 2822 * Walk through the buffer pool and push any dirty pages 2823 * associated with the vnode. 2824 */ 2825 static int 2826 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, 2827 int commit) 2828 { 2829 struct nfsnode *np = VTONFS(vp); 2830 struct buf *bp; 2831 int i; 2832 struct buf *nbp; 2833 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2834 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2835 int passone = 1; 2836 u_quad_t off, endoff, toff; 2837 struct ucred* wcred = NULL; 2838 struct buf **bvec = NULL; 2839 #ifndef NFS_COMMITBVECSIZ 2840 #define NFS_COMMITBVECSIZ 20 2841 #endif 2842 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2843 int bvecsize = 0, bveccount; 2844 2845 if (nmp->nm_flag & NFSMNT_INT) 2846 slpflag = PCATCH; 2847 if (!commit) 2848 passone = 0; 2849 /* 2850 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2851 * server, but has not been committed to stable storage on the server 2852 * yet. On the first pass, the byte range is worked out and the commit 2853 * rpc is done. On the second pass, nfs_writebp() is called to do the 2854 * job. 2855 */ 2856 again: 2857 off = (u_quad_t)-1; 2858 endoff = 0; 2859 bvecpos = 0; 2860 if (NFS_ISV3(vp) && commit) { 2861 s = splbio(); 2862 if (bvec != NULL && bvec != bvec_on_stack) 2863 free(bvec, M_TEMP); 2864 /* 2865 * Count up how many buffers waiting for a commit. 2866 */ 2867 bveccount = 0; 2868 VI_LOCK(vp); 2869 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2870 if (BUF_REFCNT(bp) == 0 && 2871 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2872 == (B_DELWRI | B_NEEDCOMMIT)) 2873 bveccount++; 2874 } 2875 /* 2876 * Allocate space to remember the list of bufs to commit. It is 2877 * important to use M_NOWAIT here to avoid a race with nfs_write. 2878 * If we can't get memory (for whatever reason), we will end up 2879 * committing the buffers one-by-one in the loop below. 2880 */ 2881 if (bveccount > NFS_COMMITBVECSIZ) { 2882 /* 2883 * Release the vnode interlock to avoid a lock 2884 * order reversal. 2885 */ 2886 VI_UNLOCK(vp); 2887 bvec = (struct buf **) 2888 malloc(bveccount * sizeof(struct buf *), 2889 M_TEMP, M_NOWAIT); 2890 VI_LOCK(vp); 2891 if (bvec == NULL) { 2892 bvec = bvec_on_stack; 2893 bvecsize = NFS_COMMITBVECSIZ; 2894 } else 2895 bvecsize = bveccount; 2896 } else { 2897 bvec = bvec_on_stack; 2898 bvecsize = NFS_COMMITBVECSIZ; 2899 } 2900 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2901 if (bvecpos >= bvecsize) 2902 break; 2903 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2904 nbp = TAILQ_NEXT(bp, b_bobufs); 2905 continue; 2906 } 2907 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2908 (B_DELWRI | B_NEEDCOMMIT)) { 2909 BUF_UNLOCK(bp); 2910 nbp = TAILQ_NEXT(bp, b_bobufs); 2911 continue; 2912 } 2913 VI_UNLOCK(vp); 2914 bremfree(bp); 2915 /* 2916 * Work out if all buffers are using the same cred 2917 * so we can deal with them all with one commit. 2918 * 2919 * NOTE: we are not clearing B_DONE here, so we have 2920 * to do it later on in this routine if we intend to 2921 * initiate I/O on the bp. 2922 * 2923 * Note: to avoid loopback deadlocks, we do not 2924 * assign b_runningbufspace. 2925 */ 2926 if (wcred == NULL) 2927 wcred = bp->b_wcred; 2928 else if (wcred != bp->b_wcred) 2929 wcred = NOCRED; 2930 vfs_busy_pages(bp, 1); 2931 2932 VI_LOCK(vp); 2933 /* 2934 * bp is protected by being locked, but nbp is not 2935 * and vfs_busy_pages() may sleep. We have to 2936 * recalculate nbp. 2937 */ 2938 nbp = TAILQ_NEXT(bp, b_bobufs); 2939 2940 /* 2941 * A list of these buffers is kept so that the 2942 * second loop knows which buffers have actually 2943 * been committed. This is necessary, since there 2944 * may be a race between the commit rpc and new 2945 * uncommitted writes on the file. 2946 */ 2947 bvec[bvecpos++] = bp; 2948 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2949 bp->b_dirtyoff; 2950 if (toff < off) 2951 off = toff; 2952 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2953 if (toff > endoff) 2954 endoff = toff; 2955 } 2956 splx(s); 2957 VI_UNLOCK(vp); 2958 } 2959 if (bvecpos > 0) { 2960 /* 2961 * Commit data on the server, as required. 2962 * If all bufs are using the same wcred, then use that with 2963 * one call for all of them, otherwise commit each one 2964 * separately. 2965 */ 2966 if (wcred != NOCRED) 2967 retv = nfs_commit(vp, off, (int)(endoff - off), 2968 wcred, td); 2969 else { 2970 retv = 0; 2971 for (i = 0; i < bvecpos; i++) { 2972 off_t off, size; 2973 bp = bvec[i]; 2974 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2975 bp->b_dirtyoff; 2976 size = (u_quad_t)(bp->b_dirtyend 2977 - bp->b_dirtyoff); 2978 retv = nfs_commit(vp, off, (int)size, 2979 bp->b_wcred, td); 2980 if (retv) break; 2981 } 2982 } 2983 2984 if (retv == NFSERR_STALEWRITEVERF) 2985 nfs_clearcommit(vp->v_mount); 2986 2987 /* 2988 * Now, either mark the blocks I/O done or mark the 2989 * blocks dirty, depending on whether the commit 2990 * succeeded. 2991 */ 2992 for (i = 0; i < bvecpos; i++) { 2993 bp = bvec[i]; 2994 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 2995 if (retv) { 2996 /* 2997 * Error, leave B_DELWRI intact 2998 */ 2999 vfs_unbusy_pages(bp); 3000 brelse(bp); 3001 } else { 3002 /* 3003 * Success, remove B_DELWRI ( bundirty() ). 3004 * 3005 * b_dirtyoff/b_dirtyend seem to be NFS 3006 * specific. We should probably move that 3007 * into bundirty(). XXX 3008 */ 3009 s = splbio(); 3010 bufobj_wref(&vp->v_bufobj); 3011 bp->b_flags |= B_ASYNC; 3012 bundirty(bp); 3013 bp->b_flags &= ~B_DONE; 3014 bp->b_ioflags &= ~BIO_ERROR; 3015 bp->b_dirtyoff = bp->b_dirtyend = 0; 3016 splx(s); 3017 bufdone(bp); 3018 } 3019 } 3020 } 3021 3022 /* 3023 * Start/do any write(s) that are required. 3024 */ 3025 loop: 3026 s = splbio(); 3027 VI_LOCK(vp); 3028 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 3029 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3030 if (waitfor != MNT_WAIT || passone) 3031 continue; 3032 3033 error = BUF_TIMELOCK(bp, 3034 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3035 VI_MTX(vp), "nfsfsync", slpflag, slptimeo); 3036 splx(s); 3037 if (error == 0) { 3038 BUF_UNLOCK(bp); 3039 goto loop; 3040 } 3041 if (error == ENOLCK) 3042 goto loop; 3043 if (nfs_sigintr(nmp, NULL, td)) { 3044 error = EINTR; 3045 goto done; 3046 } 3047 if (slpflag == PCATCH) { 3048 slpflag = 0; 3049 slptimeo = 2 * hz; 3050 } 3051 goto loop; 3052 } 3053 if ((bp->b_flags & B_DELWRI) == 0) 3054 panic("nfs_fsync: not dirty"); 3055 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3056 BUF_UNLOCK(bp); 3057 continue; 3058 } 3059 VI_UNLOCK(vp); 3060 bremfree(bp); 3061 if (passone || !commit) 3062 bp->b_flags |= B_ASYNC; 3063 else 3064 bp->b_flags |= B_ASYNC; 3065 splx(s); 3066 bwrite(bp); 3067 if (nfs_sigintr(nmp, NULL, td)) { 3068 error = EINTR; 3069 goto done; 3070 } 3071 goto loop; 3072 } 3073 splx(s); 3074 if (passone) { 3075 passone = 0; 3076 VI_UNLOCK(vp); 3077 goto again; 3078 } 3079 if (waitfor == MNT_WAIT) { 3080 while (vp->v_bufobj.bo_numoutput) { 3081 error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo); 3082 if (error) { 3083 VI_UNLOCK(vp); 3084 error = nfs_sigintr(nmp, NULL, td); 3085 if (error) 3086 goto done; 3087 if (slpflag == PCATCH) { 3088 slpflag = 0; 3089 slptimeo = 2 * hz; 3090 } 3091 VI_LOCK(vp); 3092 } 3093 } 3094 if (vp->v_bufobj.bo_dirty.bv_cnt != 0 && commit) { 3095 VI_UNLOCK(vp); 3096 goto loop; 3097 } 3098 /* 3099 * Wait for all the async IO requests to drain 3100 */ 3101 VI_UNLOCK(vp); 3102 mtx_lock(&np->n_mtx); 3103 while (np->n_directio_asyncwr > 0) { 3104 np->n_flag |= NFSYNCWAIT; 3105 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3106 &np->n_mtx, slpflag | (PRIBIO + 1), 3107 "nfsfsync", 0); 3108 if (error) { 3109 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 3110 mtx_unlock(&np->n_mtx); 3111 error = EINTR; 3112 goto done; 3113 } 3114 } 3115 } 3116 mtx_unlock(&np->n_mtx); 3117 } else 3118 VI_UNLOCK(vp); 3119 mtx_lock(&np->n_mtx); 3120 if (np->n_flag & NWRITEERR) { 3121 error = np->n_error; 3122 np->n_flag &= ~NWRITEERR; 3123 } 3124 if (commit && vp->v_bufobj.bo_dirty.bv_cnt == 0 && 3125 vp->v_bufobj.bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3126 np->n_flag &= ~NMODIFIED; 3127 mtx_unlock(&np->n_mtx); 3128 done: 3129 if (bvec != NULL && bvec != bvec_on_stack) 3130 free(bvec, M_TEMP); 3131 return (error); 3132 } 3133 3134 /* 3135 * NFS advisory byte-level locks. 3136 */ 3137 static int 3138 nfs_advlock(struct vop_advlock_args *ap) 3139 { 3140 struct vnode *vp = ap->a_vp; 3141 u_quad_t size; 3142 int error; 3143 3144 error = vn_lock(vp, LK_SHARED, curthread); 3145 if (error) 3146 return (error); 3147 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3148 size = VTONFS(vp)->n_size; 3149 VOP_UNLOCK(vp, 0, curthread); 3150 error = lf_advlock(ap, &(vp->v_lockf), size); 3151 } else { 3152 if (nfs_advlock_p) 3153 error = nfs_advlock_p(ap); 3154 else 3155 error = ENOLCK; 3156 } 3157 3158 return (error); 3159 } 3160 3161 /* 3162 * NFS advisory byte-level locks. 3163 */ 3164 static int 3165 nfs_advlockasync(struct vop_advlockasync_args *ap) 3166 { 3167 struct vnode *vp = ap->a_vp; 3168 u_quad_t size; 3169 int error; 3170 3171 error = vn_lock(vp, LK_SHARED, curthread); 3172 if (error) 3173 return (error); 3174 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3175 size = VTONFS(vp)->n_size; 3176 VOP_UNLOCK(vp, 0, curthread); 3177 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3178 } else { 3179 VOP_UNLOCK(vp, 0, curthread); 3180 error = EOPNOTSUPP; 3181 } 3182 return (error); 3183 } 3184 3185 /* 3186 * Print out the contents of an nfsnode. 3187 */ 3188 static int 3189 nfs_print(struct vop_print_args *ap) 3190 { 3191 struct vnode *vp = ap->a_vp; 3192 struct nfsnode *np = VTONFS(vp); 3193 3194 nfs_printf("\tfileid %ld fsid 0x%x", 3195 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3196 if (vp->v_type == VFIFO) 3197 fifo_printinfo(vp); 3198 printf("\n"); 3199 return (0); 3200 } 3201 3202 /* 3203 * This is the "real" nfs::bwrite(struct buf*). 3204 * We set B_CACHE if this is a VMIO buffer. 3205 */ 3206 int 3207 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3208 { 3209 int s; 3210 int oldflags = bp->b_flags; 3211 #if 0 3212 int retv = 1; 3213 off_t off; 3214 #endif 3215 3216 if (BUF_REFCNT(bp) == 0) 3217 panic("bwrite: buffer is not locked???"); 3218 3219 if (bp->b_flags & B_INVAL) { 3220 brelse(bp); 3221 return(0); 3222 } 3223 3224 bp->b_flags |= B_CACHE; 3225 3226 /* 3227 * Undirty the bp. We will redirty it later if the I/O fails. 3228 */ 3229 3230 s = splbio(); 3231 bundirty(bp); 3232 bp->b_flags &= ~B_DONE; 3233 bp->b_ioflags &= ~BIO_ERROR; 3234 bp->b_iocmd = BIO_WRITE; 3235 3236 bufobj_wref(bp->b_bufobj); 3237 curthread->td_ru.ru_oublock++; 3238 splx(s); 3239 3240 /* 3241 * Note: to avoid loopback deadlocks, we do not 3242 * assign b_runningbufspace. 3243 */ 3244 vfs_busy_pages(bp, 1); 3245 3246 BUF_KERNPROC(bp); 3247 bp->b_iooffset = dbtob(bp->b_blkno); 3248 bstrategy(bp); 3249 3250 if( (oldflags & B_ASYNC) == 0) { 3251 int rtval = bufwait(bp); 3252 3253 if (oldflags & B_DELWRI) { 3254 s = splbio(); 3255 reassignbuf(bp); 3256 splx(s); 3257 } 3258 brelse(bp); 3259 return (rtval); 3260 } 3261 3262 return (0); 3263 } 3264 3265 /* 3266 * nfs special file access vnode op. 3267 * Essentially just get vattr and then imitate iaccess() since the device is 3268 * local to the client. 3269 */ 3270 static int 3271 nfsspec_access(struct vop_access_args *ap) 3272 { 3273 struct vattr *vap; 3274 struct ucred *cred = ap->a_cred; 3275 struct vnode *vp = ap->a_vp; 3276 mode_t mode = ap->a_mode; 3277 struct vattr vattr; 3278 int error; 3279 3280 /* 3281 * Disallow write attempts on filesystems mounted read-only; 3282 * unless the file is a socket, fifo, or a block or character 3283 * device resident on the filesystem. 3284 */ 3285 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3286 switch (vp->v_type) { 3287 case VREG: 3288 case VDIR: 3289 case VLNK: 3290 return (EROFS); 3291 default: 3292 break; 3293 } 3294 } 3295 vap = &vattr; 3296 error = VOP_GETATTR(vp, vap, cred, ap->a_td); 3297 if (error) 3298 goto out; 3299 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3300 mode, cred, NULL); 3301 out: 3302 return error; 3303 } 3304 3305 /* 3306 * Read wrapper for fifos. 3307 */ 3308 static int 3309 nfsfifo_read(struct vop_read_args *ap) 3310 { 3311 struct nfsnode *np = VTONFS(ap->a_vp); 3312 int error; 3313 3314 /* 3315 * Set access flag. 3316 */ 3317 mtx_lock(&np->n_mtx); 3318 np->n_flag |= NACC; 3319 getnanotime(&np->n_atim); 3320 mtx_unlock(&np->n_mtx); 3321 error = fifo_specops.vop_read(ap); 3322 return error; 3323 } 3324 3325 /* 3326 * Write wrapper for fifos. 3327 */ 3328 static int 3329 nfsfifo_write(struct vop_write_args *ap) 3330 { 3331 struct nfsnode *np = VTONFS(ap->a_vp); 3332 3333 /* 3334 * Set update flag. 3335 */ 3336 mtx_lock(&np->n_mtx); 3337 np->n_flag |= NUPD; 3338 getnanotime(&np->n_mtim); 3339 mtx_unlock(&np->n_mtx); 3340 return(fifo_specops.vop_write(ap)); 3341 } 3342 3343 /* 3344 * Close wrapper for fifos. 3345 * 3346 * Update the times on the nfsnode then do fifo close. 3347 */ 3348 static int 3349 nfsfifo_close(struct vop_close_args *ap) 3350 { 3351 struct vnode *vp = ap->a_vp; 3352 struct nfsnode *np = VTONFS(vp); 3353 struct vattr vattr; 3354 struct timespec ts; 3355 3356 mtx_lock(&np->n_mtx); 3357 if (np->n_flag & (NACC | NUPD)) { 3358 getnanotime(&ts); 3359 if (np->n_flag & NACC) 3360 np->n_atim = ts; 3361 if (np->n_flag & NUPD) 3362 np->n_mtim = ts; 3363 np->n_flag |= NCHG; 3364 if (vrefcnt(vp) == 1 && 3365 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3366 VATTR_NULL(&vattr); 3367 if (np->n_flag & NACC) 3368 vattr.va_atime = np->n_atim; 3369 if (np->n_flag & NUPD) 3370 vattr.va_mtime = np->n_mtim; 3371 mtx_unlock(&np->n_mtx); 3372 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3373 goto out; 3374 } 3375 } 3376 mtx_unlock(&np->n_mtx); 3377 out: 3378 return (fifo_specops.vop_close(ap)); 3379 } 3380 3381 /* 3382 * Just call nfs_writebp() with the force argument set to 1. 3383 * 3384 * NOTE: B_DONE may or may not be set in a_bp on call. 3385 */ 3386 static int 3387 nfs_bwrite(struct buf *bp) 3388 { 3389 3390 return (nfs_writebp(bp, 1, curthread)); 3391 } 3392 3393 struct buf_ops buf_ops_nfs = { 3394 .bop_name = "buf_ops_nfs", 3395 .bop_write = nfs_bwrite, 3396 .bop_strategy = bufstrategy, 3397 .bop_sync = bufsync, 3398 .bop_bdflush = bufbdflush, 3399 };
Cache object: 0afcc9e1a3007436418ebf1ae85b6f6c
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]