| 1 | /* $NetBSD: nfs_bio.c,v 1.191 2015/07/15 03:28:55 manu Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Rick Macklem at The University of Guelph. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95 |
| 35 | */ |
| 36 | |
| 37 | #include <sys/cdefs.h> |
| 38 | __KERNEL_RCSID(0, "$NetBSD: nfs_bio.c,v 1.191 2015/07/15 03:28:55 manu Exp $" ); |
| 39 | |
| 40 | #ifdef _KERNEL_OPT |
| 41 | #include "opt_nfs.h" |
| 42 | #include "opt_ddb.h" |
| 43 | #endif |
| 44 | |
| 45 | #include <sys/param.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/resourcevar.h> |
| 48 | #include <sys/signalvar.h> |
| 49 | #include <sys/proc.h> |
| 50 | #include <sys/buf.h> |
| 51 | #include <sys/vnode.h> |
| 52 | #include <sys/mount.h> |
| 53 | #include <sys/kernel.h> |
| 54 | #include <sys/namei.h> |
| 55 | #include <sys/dirent.h> |
| 56 | #include <sys/kauth.h> |
| 57 | |
| 58 | #include <uvm/uvm_extern.h> |
| 59 | #include <uvm/uvm.h> |
| 60 | |
| 61 | #include <nfs/rpcv2.h> |
| 62 | #include <nfs/nfsproto.h> |
| 63 | #include <nfs/nfs.h> |
| 64 | #include <nfs/nfsmount.h> |
| 65 | #include <nfs/nfsnode.h> |
| 66 | #include <nfs/nfs_var.h> |
| 67 | |
| 68 | extern int nfs_numasync; |
| 69 | extern int nfs_commitsize; |
| 70 | extern struct nfsstats nfsstats; |
| 71 | |
| 72 | static int nfs_doio_read(struct buf *, struct uio *); |
| 73 | static int nfs_doio_write(struct buf *, struct uio *); |
| 74 | static int nfs_doio_phys(struct buf *, struct uio *); |
| 75 | |
| 76 | /* |
| 77 | * Vnode op for read using bio |
| 78 | * Any similarity to readip() is purely coincidental |
| 79 | */ |
| 80 | int |
| 81 | nfs_bioread(struct vnode *vp, struct uio *uio, int ioflag, |
| 82 | kauth_cred_t cred, int cflag) |
| 83 | { |
| 84 | struct nfsnode *np = VTONFS(vp); |
| 85 | struct buf *bp = NULL, *rabp; |
| 86 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 87 | struct nfsdircache *ndp = NULL, *nndp = NULL; |
| 88 | void *baddr; |
| 89 | int got_buf = 0, error = 0, n = 0, on = 0, en, enn; |
| 90 | int enough = 0; |
| 91 | struct dirent *dp, *pdp, *edp, *ep; |
| 92 | off_t curoff = 0; |
| 93 | int advice; |
| 94 | struct lwp *l = curlwp; |
| 95 | |
| 96 | #ifdef DIAGNOSTIC |
| 97 | if (uio->uio_rw != UIO_READ) |
| 98 | panic("nfs_read mode" ); |
| 99 | #endif |
| 100 | if (uio->uio_resid == 0) |
| 101 | return (0); |
| 102 | if (vp->v_type != VDIR && uio->uio_offset < 0) |
| 103 | return (EINVAL); |
| 104 | #ifndef NFS_V2_ONLY |
| 105 | if ((nmp->nm_flag & NFSMNT_NFSV3) && |
| 106 | !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) |
| 107 | (void)nfs_fsinfo(nmp, vp, cred, l); |
| 108 | #endif |
| 109 | if (vp->v_type != VDIR && |
| 110 | (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) |
| 111 | return (EFBIG); |
| 112 | |
| 113 | /* |
| 114 | * For nfs, cache consistency can only be maintained approximately. |
| 115 | * Although RFC1094 does not specify the criteria, the following is |
| 116 | * believed to be compatible with the reference port. |
| 117 | * |
| 118 | * If the file's modify time on the server has changed since the |
| 119 | * last read rpc or you have written to the file, |
| 120 | * you may have lost data cache consistency with the |
| 121 | * server, so flush all of the file's data out of the cache. |
| 122 | * Then force a getattr rpc to ensure that you have up to date |
| 123 | * attributes. |
| 124 | * NB: This implies that cache data can be read when up to |
| 125 | * nfs_attrtimeo seconds out of date. If you find that you need current |
| 126 | * attributes this could be forced by setting n_attrstamp to 0 before |
| 127 | * the VOP_GETATTR() call. |
| 128 | */ |
| 129 | |
| 130 | if (vp->v_type != VLNK) { |
| 131 | error = nfs_flushstalebuf(vp, cred, l, |
| 132 | NFS_FLUSHSTALEBUF_MYWRITE); |
| 133 | if (error) |
| 134 | return error; |
| 135 | } |
| 136 | |
| 137 | do { |
| 138 | /* |
| 139 | * Don't cache symlinks. |
| 140 | */ |
| 141 | if ((vp->v_vflag & VV_ROOT) && vp->v_type == VLNK) { |
| 142 | return (nfs_readlinkrpc(vp, uio, cred)); |
| 143 | } |
| 144 | baddr = (void *)0; |
| 145 | switch (vp->v_type) { |
| 146 | case VREG: |
| 147 | nfsstats.biocache_reads++; |
| 148 | |
| 149 | advice = IO_ADV_DECODE(ioflag); |
| 150 | error = 0; |
| 151 | while (uio->uio_resid > 0) { |
| 152 | vsize_t bytelen; |
| 153 | |
| 154 | nfs_delayedtruncate(vp); |
| 155 | if (np->n_size <= uio->uio_offset) { |
| 156 | break; |
| 157 | } |
| 158 | bytelen = |
| 159 | MIN(np->n_size - uio->uio_offset, uio->uio_resid); |
| 160 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, |
| 161 | UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); |
| 162 | if (error) { |
| 163 | /* |
| 164 | * XXXkludge |
| 165 | * the file has been truncated on the server. |
| 166 | * there isn't much we can do. |
| 167 | */ |
| 168 | if (uio->uio_offset >= np->n_size) { |
| 169 | /* end of file */ |
| 170 | error = 0; |
| 171 | } else { |
| 172 | break; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | break; |
| 177 | |
| 178 | case VLNK: |
| 179 | nfsstats.biocache_readlinks++; |
| 180 | bp = nfs_getcacheblk(vp, (daddr_t)0, MAXPATHLEN, l); |
| 181 | if (!bp) |
| 182 | return (EINTR); |
| 183 | if ((bp->b_oflags & BO_DONE) == 0) { |
| 184 | bp->b_flags |= B_READ; |
| 185 | error = nfs_doio(bp); |
| 186 | if (error) { |
| 187 | brelse(bp, 0); |
| 188 | return (error); |
| 189 | } |
| 190 | } |
| 191 | n = MIN(uio->uio_resid, MAXPATHLEN - bp->b_resid); |
| 192 | got_buf = 1; |
| 193 | on = 0; |
| 194 | break; |
| 195 | case VDIR: |
| 196 | diragain: |
| 197 | nfsstats.biocache_readdirs++; |
| 198 | ndp = nfs_searchdircache(vp, uio->uio_offset, |
| 199 | (nmp->nm_flag & NFSMNT_XLATECOOKIE), 0); |
| 200 | if (!ndp) { |
| 201 | /* |
| 202 | * We've been handed a cookie that is not |
| 203 | * in the cache. If we're not translating |
| 204 | * 32 <-> 64, it may be a value that was |
| 205 | * flushed out of the cache because it grew |
| 206 | * too big. Let the server judge if it's |
| 207 | * valid or not. In the translation case, |
| 208 | * we have no way of validating this value, |
| 209 | * so punt. |
| 210 | */ |
| 211 | if (nmp->nm_flag & NFSMNT_XLATECOOKIE) |
| 212 | return (EINVAL); |
| 213 | ndp = nfs_enterdircache(vp, uio->uio_offset, |
| 214 | uio->uio_offset, 0, 0); |
| 215 | } |
| 216 | |
| 217 | if (NFS_EOFVALID(np) && |
| 218 | ndp->dc_cookie == np->n_direofoffset) { |
| 219 | nfs_putdircache(np, ndp); |
| 220 | nfsstats.direofcache_hits++; |
| 221 | return (0); |
| 222 | } |
| 223 | |
| 224 | bp = nfs_getcacheblk(vp, NFSDC_BLKNO(ndp), NFS_DIRBLKSIZ, l); |
| 225 | if (!bp) |
| 226 | return (EINTR); |
| 227 | if ((bp->b_oflags & BO_DONE) == 0) { |
| 228 | bp->b_flags |= B_READ; |
| 229 | bp->b_dcookie = ndp->dc_blkcookie; |
| 230 | error = nfs_doio(bp); |
| 231 | if (error) { |
| 232 | /* |
| 233 | * Yuck! The directory has been modified on the |
| 234 | * server. Punt and let the userland code |
| 235 | * deal with it. |
| 236 | */ |
| 237 | nfs_putdircache(np, ndp); |
| 238 | brelse(bp, 0); |
| 239 | /* |
| 240 | * nfs_request maps NFSERR_BAD_COOKIE to EINVAL. |
| 241 | */ |
| 242 | if (error == EINVAL) { /* NFSERR_BAD_COOKIE */ |
| 243 | nfs_invaldircache(vp, 0); |
| 244 | nfs_vinvalbuf(vp, 0, cred, l, 1); |
| 245 | } |
| 246 | return (error); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Just return if we hit EOF right away with this |
| 252 | * block. Always check here, because direofoffset |
| 253 | * may have been set by an nfsiod since the last |
| 254 | * check. |
| 255 | * |
| 256 | * also, empty block implies EOF. |
| 257 | */ |
| 258 | |
| 259 | if (bp->b_bcount == bp->b_resid || |
| 260 | (NFS_EOFVALID(np) && |
| 261 | ndp->dc_blkcookie == np->n_direofoffset)) { |
| 262 | KASSERT(bp->b_bcount != bp->b_resid || |
| 263 | ndp->dc_blkcookie == bp->b_dcookie); |
| 264 | nfs_putdircache(np, ndp); |
| 265 | brelse(bp, BC_NOCACHE); |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Find the entry we were looking for in the block. |
| 271 | */ |
| 272 | |
| 273 | en = ndp->dc_entry; |
| 274 | |
| 275 | pdp = dp = (struct dirent *)bp->b_data; |
| 276 | edp = (struct dirent *)(void *)((char *)bp->b_data + bp->b_bcount - |
| 277 | bp->b_resid); |
| 278 | enn = 0; |
| 279 | while (enn < en && dp < edp) { |
| 280 | pdp = dp; |
| 281 | dp = _DIRENT_NEXT(dp); |
| 282 | enn++; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * If the entry number was bigger than the number of |
| 287 | * entries in the block, or the cookie of the previous |
| 288 | * entry doesn't match, the directory cache is |
| 289 | * stale. Flush it and try again (i.e. go to |
| 290 | * the server). |
| 291 | */ |
| 292 | if (dp >= edp || (struct dirent *)_DIRENT_NEXT(dp) > edp || |
| 293 | (en > 0 && NFS_GETCOOKIE(pdp) != ndp->dc_cookie)) { |
| 294 | #ifdef DEBUG |
| 295 | printf("invalid cache: %p %p %p off %jx %jx\n" , |
| 296 | pdp, dp, edp, |
| 297 | (uintmax_t)uio->uio_offset, |
| 298 | (uintmax_t)NFS_GETCOOKIE(pdp)); |
| 299 | #endif |
| 300 | nfs_putdircache(np, ndp); |
| 301 | brelse(bp, 0); |
| 302 | nfs_invaldircache(vp, 0); |
| 303 | nfs_vinvalbuf(vp, 0, cred, l, 0); |
| 304 | goto diragain; |
| 305 | } |
| 306 | |
| 307 | on = (char *)dp - (char *)bp->b_data; |
| 308 | |
| 309 | /* |
| 310 | * Cache all entries that may be exported to the |
| 311 | * user, as they may be thrown back at us. The |
| 312 | * NFSBIO_CACHECOOKIES flag indicates that all |
| 313 | * entries are being 'exported', so cache them all. |
| 314 | */ |
| 315 | |
| 316 | if (en == 0 && pdp == dp) { |
| 317 | dp = _DIRENT_NEXT(dp); |
| 318 | enn++; |
| 319 | } |
| 320 | |
| 321 | if (uio->uio_resid < (bp->b_bcount - bp->b_resid - on)) { |
| 322 | n = uio->uio_resid; |
| 323 | enough = 1; |
| 324 | } else |
| 325 | n = bp->b_bcount - bp->b_resid - on; |
| 326 | |
| 327 | ep = (struct dirent *)(void *)((char *)bp->b_data + on + n); |
| 328 | |
| 329 | /* |
| 330 | * Find last complete entry to copy, caching entries |
| 331 | * (if requested) as we go. |
| 332 | */ |
| 333 | |
| 334 | while (dp < ep && (struct dirent *)_DIRENT_NEXT(dp) <= ep) { |
| 335 | if (cflag & NFSBIO_CACHECOOKIES) { |
| 336 | nndp = nfs_enterdircache(vp, NFS_GETCOOKIE(pdp), |
| 337 | ndp->dc_blkcookie, enn, bp->b_lblkno); |
| 338 | if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { |
| 339 | NFS_STASHCOOKIE32(pdp, |
| 340 | nndp->dc_cookie32); |
| 341 | } |
| 342 | nfs_putdircache(np, nndp); |
| 343 | } |
| 344 | pdp = dp; |
| 345 | dp = _DIRENT_NEXT(dp); |
| 346 | enn++; |
| 347 | } |
| 348 | nfs_putdircache(np, ndp); |
| 349 | |
| 350 | /* |
| 351 | * If the last requested entry was not the last in the |
| 352 | * buffer (happens if NFS_DIRFRAGSIZ < NFS_DIRBLKSIZ), |
| 353 | * cache the cookie of the last requested one, and |
| 354 | * set of the offset to it. |
| 355 | */ |
| 356 | |
| 357 | if ((on + n) < bp->b_bcount - bp->b_resid) { |
| 358 | curoff = NFS_GETCOOKIE(pdp); |
| 359 | nndp = nfs_enterdircache(vp, curoff, ndp->dc_blkcookie, |
| 360 | enn, bp->b_lblkno); |
| 361 | if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { |
| 362 | NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); |
| 363 | curoff = nndp->dc_cookie32; |
| 364 | } |
| 365 | nfs_putdircache(np, nndp); |
| 366 | } else |
| 367 | curoff = bp->b_dcookie; |
| 368 | |
| 369 | /* |
| 370 | * Always cache the entry for the next block, |
| 371 | * so that readaheads can use it. |
| 372 | */ |
| 373 | nndp = nfs_enterdircache(vp, bp->b_dcookie, bp->b_dcookie, 0,0); |
| 374 | if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { |
| 375 | if (curoff == bp->b_dcookie) { |
| 376 | NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); |
| 377 | curoff = nndp->dc_cookie32; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | n = (char *)_DIRENT_NEXT(pdp) - ((char *)bp->b_data + on); |
| 382 | |
| 383 | /* |
| 384 | * If not eof and read aheads are enabled, start one. |
| 385 | * (You need the current block first, so that you have the |
| 386 | * directory offset cookie of the next block.) |
| 387 | */ |
| 388 | if (nfs_numasync > 0 && nmp->nm_readahead > 0 && |
| 389 | !NFS_EOFVALID(np)) { |
| 390 | rabp = nfs_getcacheblk(vp, NFSDC_BLKNO(nndp), |
| 391 | NFS_DIRBLKSIZ, l); |
| 392 | if (rabp) { |
| 393 | if ((rabp->b_oflags & (BO_DONE | BO_DELWRI)) == 0) { |
| 394 | rabp->b_dcookie = nndp->dc_cookie; |
| 395 | rabp->b_flags |= (B_READ | B_ASYNC); |
| 396 | if (nfs_asyncio(rabp)) { |
| 397 | brelse(rabp, BC_INVAL); |
| 398 | } |
| 399 | } else |
| 400 | brelse(rabp, 0); |
| 401 | } |
| 402 | } |
| 403 | nfs_putdircache(np, nndp); |
| 404 | got_buf = 1; |
| 405 | break; |
| 406 | default: |
| 407 | printf(" nfsbioread: type %x unexpected\n" ,vp->v_type); |
| 408 | break; |
| 409 | } |
| 410 | |
| 411 | if (n > 0) { |
| 412 | if (!baddr) |
| 413 | baddr = bp->b_data; |
| 414 | error = uiomove((char *)baddr + on, (int)n, uio); |
| 415 | } |
| 416 | switch (vp->v_type) { |
| 417 | case VREG: |
| 418 | break; |
| 419 | case VLNK: |
| 420 | n = 0; |
| 421 | break; |
| 422 | case VDIR: |
| 423 | uio->uio_offset = curoff; |
| 424 | if (enough) |
| 425 | n = 0; |
| 426 | break; |
| 427 | default: |
| 428 | printf(" nfsbioread: type %x unexpected\n" ,vp->v_type); |
| 429 | } |
| 430 | if (got_buf) |
| 431 | brelse(bp, 0); |
| 432 | } while (error == 0 && uio->uio_resid > 0 && n > 0); |
| 433 | return (error); |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * Vnode op for write using bio |
| 438 | */ |
| 439 | int |
| 440 | nfs_write(void *v) |
| 441 | { |
| 442 | struct vop_write_args /* { |
| 443 | struct vnode *a_vp; |
| 444 | struct uio *a_uio; |
| 445 | int a_ioflag; |
| 446 | kauth_cred_t a_cred; |
| 447 | } */ *ap = v; |
| 448 | struct uio *uio = ap->a_uio; |
| 449 | struct lwp *l = curlwp; |
| 450 | struct vnode *vp = ap->a_vp; |
| 451 | struct nfsnode *np = VTONFS(vp); |
| 452 | kauth_cred_t cred = ap->a_cred; |
| 453 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 454 | voff_t oldoff, origoff; |
| 455 | vsize_t bytelen; |
| 456 | int error = 0; |
| 457 | int ioflag = ap->a_ioflag; |
| 458 | int extended = 0, wrotedata = 0; |
| 459 | |
| 460 | #ifdef DIAGNOSTIC |
| 461 | if (uio->uio_rw != UIO_WRITE) |
| 462 | panic("nfs_write mode" ); |
| 463 | #endif |
| 464 | if (vp->v_type != VREG) |
| 465 | return (EIO); |
| 466 | if (np->n_flag & NWRITEERR) { |
| 467 | np->n_flag &= ~NWRITEERR; |
| 468 | return (np->n_error); |
| 469 | } |
| 470 | #ifndef NFS_V2_ONLY |
| 471 | if ((nmp->nm_flag & NFSMNT_NFSV3) && |
| 472 | !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) |
| 473 | (void)nfs_fsinfo(nmp, vp, cred, l); |
| 474 | #endif |
| 475 | if (ioflag & IO_APPEND) { |
| 476 | NFS_INVALIDATE_ATTRCACHE(np); |
| 477 | error = nfs_flushstalebuf(vp, cred, l, |
| 478 | NFS_FLUSHSTALEBUF_MYWRITE); |
| 479 | if (error) |
| 480 | return (error); |
| 481 | uio->uio_offset = np->n_size; |
| 482 | |
| 483 | /* |
| 484 | * This is already checked above VOP_WRITE, but recheck |
| 485 | * the append case here to make sure our idea of the |
| 486 | * file size is as fresh as possible. |
| 487 | */ |
| 488 | if (uio->uio_offset + uio->uio_resid > |
| 489 | l->l_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { |
| 490 | mutex_enter(proc_lock); |
| 491 | psignal(l->l_proc, SIGXFSZ); |
| 492 | mutex_exit(proc_lock); |
| 493 | return (EFBIG); |
| 494 | } |
| 495 | } |
| 496 | if (uio->uio_offset < 0) |
| 497 | return (EINVAL); |
| 498 | if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) |
| 499 | return (EFBIG); |
| 500 | if (uio->uio_resid == 0) |
| 501 | return (0); |
| 502 | |
| 503 | origoff = uio->uio_offset; |
| 504 | do { |
| 505 | bool overwrite; /* if we are overwriting whole pages */ |
| 506 | u_quad_t oldsize; |
| 507 | oldoff = uio->uio_offset; |
| 508 | bytelen = uio->uio_resid; |
| 509 | |
| 510 | nfsstats.biocache_writes++; |
| 511 | |
| 512 | oldsize = np->n_size; |
| 513 | np->n_flag |= NMODIFIED; |
| 514 | if (np->n_size < uio->uio_offset + bytelen) { |
| 515 | np->n_size = uio->uio_offset + bytelen; |
| 516 | } |
| 517 | overwrite = false; |
| 518 | if ((uio->uio_offset & PAGE_MASK) == 0) { |
| 519 | if ((vp->v_vflag & VV_MAPPED) == 0 && |
| 520 | bytelen > PAGE_SIZE) { |
| 521 | bytelen = trunc_page(bytelen); |
| 522 | overwrite = true; |
| 523 | } else if ((bytelen & PAGE_MASK) == 0 && |
| 524 | uio->uio_offset >= vp->v_size) { |
| 525 | overwrite = true; |
| 526 | } |
| 527 | } |
| 528 | if (vp->v_size < uio->uio_offset + bytelen) { |
| 529 | uvm_vnp_setwritesize(vp, uio->uio_offset + bytelen); |
| 530 | } |
| 531 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, |
| 532 | UVM_ADV_RANDOM, UBC_WRITE | UBC_PARTIALOK | |
| 533 | (overwrite ? UBC_FAULTBUSY : 0) | |
| 534 | UBC_UNMAP_FLAG(vp)); |
| 535 | if (error) { |
| 536 | uvm_vnp_setwritesize(vp, vp->v_size); |
| 537 | if (overwrite && np->n_size != oldsize) { |
| 538 | /* |
| 539 | * backout size and free pages past eof. |
| 540 | */ |
| 541 | np->n_size = oldsize; |
| 542 | mutex_enter(vp->v_interlock); |
| 543 | (void)VOP_PUTPAGES(vp, round_page(vp->v_size), |
| 544 | 0, PGO_SYNCIO | PGO_FREE); |
| 545 | } |
| 546 | break; |
| 547 | } |
| 548 | wrotedata = 1; |
| 549 | |
| 550 | /* |
| 551 | * update UVM's notion of the size now that we've |
| 552 | * copied the data into the vnode's pages. |
| 553 | */ |
| 554 | |
| 555 | if (vp->v_size < uio->uio_offset) { |
| 556 | uvm_vnp_setsize(vp, uio->uio_offset); |
| 557 | extended = 1; |
| 558 | } |
| 559 | |
| 560 | if ((oldoff & ~(nmp->nm_wsize - 1)) != |
| 561 | (uio->uio_offset & ~(nmp->nm_wsize - 1))) { |
| 562 | mutex_enter(vp->v_interlock); |
| 563 | error = VOP_PUTPAGES(vp, |
| 564 | trunc_page(oldoff & ~(nmp->nm_wsize - 1)), |
| 565 | round_page((uio->uio_offset + nmp->nm_wsize - 1) & |
| 566 | ~(nmp->nm_wsize - 1)), PGO_CLEANIT); |
| 567 | } |
| 568 | } while (uio->uio_resid > 0); |
| 569 | if (wrotedata) |
| 570 | VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); |
| 571 | if (error == 0 && (ioflag & IO_SYNC) != 0) { |
| 572 | mutex_enter(vp->v_interlock); |
| 573 | error = VOP_PUTPAGES(vp, |
| 574 | trunc_page(origoff & ~(nmp->nm_wsize - 1)), |
| 575 | round_page((uio->uio_offset + nmp->nm_wsize - 1) & |
| 576 | ~(nmp->nm_wsize - 1)), |
| 577 | PGO_CLEANIT | PGO_SYNCIO); |
| 578 | } |
| 579 | return error; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Get an nfs cache block. |
| 584 | * Allocate a new one if the block isn't currently in the cache |
| 585 | * and return the block marked busy. If the calling process is |
| 586 | * interrupted by a signal for an interruptible mount point, return |
| 587 | * NULL. |
| 588 | */ |
| 589 | struct buf * |
| 590 | nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct lwp *l) |
| 591 | { |
| 592 | struct buf *bp; |
| 593 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 594 | |
| 595 | if (nmp->nm_flag & NFSMNT_INT) { |
| 596 | bp = getblk(vp, bn, size, PCATCH, 0); |
| 597 | while (bp == NULL) { |
| 598 | if (nfs_sigintr(nmp, NULL, l)) |
| 599 | return (NULL); |
| 600 | bp = getblk(vp, bn, size, 0, 2 * hz); |
| 601 | } |
| 602 | } else |
| 603 | bp = getblk(vp, bn, size, 0, 0); |
| 604 | return (bp); |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * Flush and invalidate all dirty buffers. If another process is already |
| 609 | * doing the flush, just wait for completion. |
| 610 | */ |
| 611 | int |
| 612 | nfs_vinvalbuf(struct vnode *vp, int flags, kauth_cred_t cred, |
| 613 | struct lwp *l, int intrflg) |
| 614 | { |
| 615 | struct nfsnode *np = VTONFS(vp); |
| 616 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 617 | int error = 0, allerror = 0, slptimeo; |
| 618 | bool catch_p; |
| 619 | |
| 620 | if ((nmp->nm_flag & NFSMNT_INT) == 0) |
| 621 | intrflg = 0; |
| 622 | if (intrflg) { |
| 623 | catch_p = true; |
| 624 | slptimeo = 2 * hz; |
| 625 | } else { |
| 626 | catch_p = false; |
| 627 | if (nmp->nm_flag & NFSMNT_SOFT) |
| 628 | slptimeo = nmp->nm_retry * nmp->nm_timeo; |
| 629 | else |
| 630 | slptimeo = 0; |
| 631 | } |
| 632 | /* |
| 633 | * First wait for any other process doing a flush to complete. |
| 634 | */ |
| 635 | mutex_enter(vp->v_interlock); |
| 636 | while (np->n_flag & NFLUSHINPROG) { |
| 637 | np->n_flag |= NFLUSHWANT; |
| 638 | error = mtsleep(&np->n_flag, PRIBIO + 2, "nfsvinval" , |
| 639 | slptimeo, vp->v_interlock); |
| 640 | if (error && intrflg && nfs_sigintr(nmp, NULL, l)) { |
| 641 | mutex_exit(vp->v_interlock); |
| 642 | return EINTR; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Now, flush as required. |
| 648 | */ |
| 649 | np->n_flag |= NFLUSHINPROG; |
| 650 | mutex_exit(vp->v_interlock); |
| 651 | error = vinvalbuf(vp, flags, cred, l, catch_p, 0); |
| 652 | while (error) { |
| 653 | if (allerror == 0) |
| 654 | allerror = error; |
| 655 | if (intrflg && nfs_sigintr(nmp, NULL, l)) { |
| 656 | error = EINTR; |
| 657 | break; |
| 658 | } |
| 659 | error = vinvalbuf(vp, flags, cred, l, 0, slptimeo); |
| 660 | } |
| 661 | mutex_enter(vp->v_interlock); |
| 662 | if (allerror != 0) { |
| 663 | /* |
| 664 | * Keep error from vinvalbuf so fsync/close will know. |
| 665 | */ |
| 666 | np->n_error = allerror; |
| 667 | np->n_flag |= NWRITEERR; |
| 668 | } |
| 669 | if (error == 0) |
| 670 | np->n_flag &= ~NMODIFIED; |
| 671 | np->n_flag &= ~NFLUSHINPROG; |
| 672 | if (np->n_flag & NFLUSHWANT) { |
| 673 | np->n_flag &= ~NFLUSHWANT; |
| 674 | wakeup(&np->n_flag); |
| 675 | } |
| 676 | mutex_exit(vp->v_interlock); |
| 677 | return error; |
| 678 | } |
| 679 | |
| 680 | /* |
| 681 | * nfs_flushstalebuf: flush cache if it's stale. |
| 682 | * |
| 683 | * => caller shouldn't own any pages or buffers which belong to the vnode. |
| 684 | */ |
| 685 | |
| 686 | int |
| 687 | nfs_flushstalebuf(struct vnode *vp, kauth_cred_t cred, struct lwp *l, |
| 688 | int flags) |
| 689 | { |
| 690 | struct nfsnode *np = VTONFS(vp); |
| 691 | struct vattr vattr; |
| 692 | int error; |
| 693 | |
| 694 | if (np->n_flag & NMODIFIED) { |
| 695 | if ((flags & NFS_FLUSHSTALEBUF_MYWRITE) == 0 |
| 696 | || vp->v_type != VREG) { |
| 697 | error = nfs_vinvalbuf(vp, V_SAVE, cred, l, 1); |
| 698 | if (error) |
| 699 | return error; |
| 700 | if (vp->v_type == VDIR) { |
| 701 | nfs_invaldircache(vp, 0); |
| 702 | } |
| 703 | } else { |
| 704 | /* |
| 705 | * XXX assuming writes are ours. |
| 706 | */ |
| 707 | } |
| 708 | NFS_INVALIDATE_ATTRCACHE(np); |
| 709 | error = VOP_GETATTR(vp, &vattr, cred); |
| 710 | if (error) |
| 711 | return error; |
| 712 | np->n_mtime = vattr.va_mtime; |
| 713 | } else { |
| 714 | error = VOP_GETATTR(vp, &vattr, cred); |
| 715 | if (error) |
| 716 | return error; |
| 717 | if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=)) { |
| 718 | if (vp->v_type == VDIR) { |
| 719 | nfs_invaldircache(vp, 0); |
| 720 | } |
| 721 | error = nfs_vinvalbuf(vp, V_SAVE, cred, l, 1); |
| 722 | if (error) |
| 723 | return error; |
| 724 | np->n_mtime = vattr.va_mtime; |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | return error; |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Initiate asynchronous I/O. Return an error if no nfsiods are available. |
| 733 | * This is mainly to avoid queueing async I/O requests when the nfsiods |
| 734 | * are all hung on a dead server. |
| 735 | */ |
| 736 | |
| 737 | int |
| 738 | nfs_asyncio(struct buf *bp) |
| 739 | { |
| 740 | struct nfs_iod *iod; |
| 741 | struct nfsmount *nmp; |
| 742 | int slptimeo = 0, error; |
| 743 | bool catch_p = false; |
| 744 | |
| 745 | if (nfs_numasync == 0) |
| 746 | return (EIO); |
| 747 | |
| 748 | nmp = VFSTONFS(bp->b_vp->v_mount); |
| 749 | |
| 750 | if (nmp->nm_flag & NFSMNT_SOFT) |
| 751 | slptimeo = nmp->nm_retry * nmp->nm_timeo; |
| 752 | |
| 753 | if (nmp->nm_iflag & NFSMNT_DISMNTFORCE) |
| 754 | slptimeo = hz; |
| 755 | |
| 756 | again: |
| 757 | if (nmp->nm_flag & NFSMNT_INT) |
| 758 | catch_p = true; |
| 759 | |
| 760 | /* |
| 761 | * Find a free iod to process this request. |
| 762 | */ |
| 763 | |
| 764 | mutex_enter(&nfs_iodlist_lock); |
| 765 | iod = LIST_FIRST(&nfs_iodlist_idle); |
| 766 | if (iod) { |
| 767 | /* |
| 768 | * Found one, so wake it up and tell it which |
| 769 | * mount to process. |
| 770 | */ |
| 771 | LIST_REMOVE(iod, nid_idle); |
| 772 | mutex_enter(&iod->nid_lock); |
| 773 | mutex_exit(&nfs_iodlist_lock); |
| 774 | KASSERT(iod->nid_mount == NULL); |
| 775 | iod->nid_mount = nmp; |
| 776 | cv_signal(&iod->nid_cv); |
| 777 | mutex_enter(&nmp->nm_lock); |
| 778 | mutex_exit(&iod->nid_lock); |
| 779 | nmp->nm_bufqiods++; |
| 780 | if (nmp->nm_bufqlen < 2 * nmp->nm_bufqiods) { |
| 781 | cv_broadcast(&nmp->nm_aiocv); |
| 782 | } |
| 783 | } else { |
| 784 | mutex_exit(&nfs_iodlist_lock); |
| 785 | mutex_enter(&nmp->nm_lock); |
| 786 | } |
| 787 | |
| 788 | KASSERT(mutex_owned(&nmp->nm_lock)); |
| 789 | |
| 790 | /* |
| 791 | * If we have an iod which can process the request, then queue |
| 792 | * the buffer. However, even if we have an iod, do not initiate |
| 793 | * queue cleaning if curproc is the pageout daemon. if the NFS mount |
| 794 | * is via local loopback, we may put curproc (pagedaemon) to sleep |
| 795 | * waiting for the writes to complete. But the server (ourself) |
| 796 | * may block the write, waiting for its (ie., our) pagedaemon |
| 797 | * to produce clean pages to handle the write: deadlock. |
| 798 | * XXX: start non-loopback mounts straight away? If "lots free", |
| 799 | * let pagedaemon start loopback writes anyway? |
| 800 | */ |
| 801 | if (nmp->nm_bufqiods > 0) { |
| 802 | |
| 803 | /* |
| 804 | * Ensure that the queue never grows too large. |
| 805 | */ |
| 806 | if (curlwp == uvm.pagedaemon_lwp) { |
| 807 | /* Enque for later, to avoid free-page deadlock */ |
| 808 | } else while (nmp->nm_bufqlen >= 2 * nmp->nm_bufqiods) { |
| 809 | if (catch_p) { |
| 810 | error = cv_timedwait_sig(&nmp->nm_aiocv, |
| 811 | &nmp->nm_lock, slptimeo); |
| 812 | } else { |
| 813 | error = cv_timedwait(&nmp->nm_aiocv, |
| 814 | &nmp->nm_lock, slptimeo); |
| 815 | } |
| 816 | if (error) { |
| 817 | if (error == EWOULDBLOCK && |
| 818 | nmp->nm_flag & NFSMNT_SOFT) { |
| 819 | mutex_exit(&nmp->nm_lock); |
| 820 | bp->b_error = EIO; |
| 821 | return (EIO); |
| 822 | } |
| 823 | |
| 824 | if (nfs_sigintr(nmp, NULL, curlwp)) { |
| 825 | mutex_exit(&nmp->nm_lock); |
| 826 | return (EINTR); |
| 827 | } |
| 828 | if (catch_p) { |
| 829 | catch_p = false; |
| 830 | slptimeo = 2 * hz; |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | /* |
| 835 | * We might have lost our iod while sleeping, |
| 836 | * so check and loop if necessary. |
| 837 | */ |
| 838 | |
| 839 | if (nmp->nm_bufqiods == 0) { |
| 840 | mutex_exit(&nmp->nm_lock); |
| 841 | goto again; |
| 842 | } |
| 843 | } |
| 844 | TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist); |
| 845 | nmp->nm_bufqlen++; |
| 846 | mutex_exit(&nmp->nm_lock); |
| 847 | return (0); |
| 848 | } |
| 849 | mutex_exit(&nmp->nm_lock); |
| 850 | |
| 851 | /* |
| 852 | * All the iods are busy on other mounts, so return EIO to |
| 853 | * force the caller to process the i/o synchronously. |
| 854 | */ |
| 855 | |
| 856 | return (EIO); |
| 857 | } |
| 858 | |
| 859 | /* |
| 860 | * nfs_doio for read. |
| 861 | */ |
| 862 | static int |
| 863 | nfs_doio_read(struct buf *bp, struct uio *uiop) |
| 864 | { |
| 865 | struct vnode *vp = bp->b_vp; |
| 866 | struct nfsnode *np = VTONFS(vp); |
| 867 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 868 | int error = 0; |
| 869 | |
| 870 | uiop->uio_rw = UIO_READ; |
| 871 | switch (vp->v_type) { |
| 872 | case VREG: |
| 873 | nfsstats.read_bios++; |
| 874 | error = nfs_readrpc(vp, uiop); |
| 875 | if (!error && uiop->uio_resid) { |
| 876 | int diff, len; |
| 877 | |
| 878 | /* |
| 879 | * If uio_resid > 0, there is a hole in the file and |
| 880 | * no writes after the hole have been pushed to |
| 881 | * the server yet or the file has been truncated |
| 882 | * on the server. |
| 883 | * Just zero fill the rest of the valid area. |
| 884 | */ |
| 885 | |
| 886 | KASSERT(vp->v_size >= |
| 887 | uiop->uio_offset + uiop->uio_resid); |
| 888 | diff = bp->b_bcount - uiop->uio_resid; |
| 889 | len = uiop->uio_resid; |
| 890 | memset((char *)bp->b_data + diff, 0, len); |
| 891 | uiop->uio_resid = 0; |
| 892 | } |
| 893 | #if 0 |
| 894 | if (uiop->uio_lwp && (vp->v_iflag & VI_TEXT) && |
| 895 | timespeccmp(&np->n_mtime, &np->n_vattr->va_mtime, !=)) { |
| 896 | mutex_enter(proc_lock); |
| 897 | killproc(uiop->uio_lwp->l_proc, "process text file was modified" ); |
| 898 | mutex_exit(proc_lock); |
| 899 | #if 0 /* XXX NJWLWP */ |
| 900 | uiop->uio_lwp->l_proc->p_holdcnt++; |
| 901 | #endif |
| 902 | } |
| 903 | #endif |
| 904 | break; |
| 905 | case VLNK: |
| 906 | KASSERT(uiop->uio_offset == (off_t)0); |
| 907 | nfsstats.readlink_bios++; |
| 908 | error = nfs_readlinkrpc(vp, uiop, np->n_rcred); |
| 909 | break; |
| 910 | case VDIR: |
| 911 | nfsstats.readdir_bios++; |
| 912 | uiop->uio_offset = bp->b_dcookie; |
| 913 | #ifndef NFS_V2_ONLY |
| 914 | if (nmp->nm_flag & NFSMNT_RDIRPLUS) { |
| 915 | error = nfs_readdirplusrpc(vp, uiop, |
| 916 | curlwp->l_cred); |
| 917 | /* |
| 918 | * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. |
| 919 | */ |
| 920 | if (error == ENOTSUP) |
| 921 | nmp->nm_flag &= ~NFSMNT_RDIRPLUS; |
| 922 | } |
| 923 | #else |
| 924 | nmp->nm_flag &= ~NFSMNT_RDIRPLUS; |
| 925 | #endif |
| 926 | if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) |
| 927 | error = nfs_readdirrpc(vp, uiop, |
| 928 | curlwp->l_cred); |
| 929 | if (!error) { |
| 930 | bp->b_dcookie = uiop->uio_offset; |
| 931 | } |
| 932 | break; |
| 933 | default: |
| 934 | printf("nfs_doio: type %x unexpected\n" , vp->v_type); |
| 935 | break; |
| 936 | } |
| 937 | bp->b_error = error; |
| 938 | return error; |
| 939 | } |
| 940 | |
| 941 | /* |
| 942 | * nfs_doio for write. |
| 943 | */ |
| 944 | static int |
| 945 | nfs_doio_write(struct buf *bp, struct uio *uiop) |
| 946 | { |
| 947 | struct vnode *vp = bp->b_vp; |
| 948 | struct nfsnode *np = VTONFS(vp); |
| 949 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 950 | int iomode; |
| 951 | bool stalewriteverf = false; |
| 952 | int i, npages = (bp->b_bcount + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 953 | struct vm_page **pgs, *spgs[UBC_MAX_PAGES]; |
| 954 | #ifndef NFS_V2_ONLY |
| 955 | bool needcommit = true; /* need only COMMIT RPC */ |
| 956 | #else |
| 957 | bool needcommit = false; /* need only COMMIT RPC */ |
| 958 | #endif |
| 959 | bool pageprotected; |
| 960 | struct uvm_object *uobj = &vp->v_uobj; |
| 961 | int error; |
| 962 | off_t off, cnt; |
| 963 | |
| 964 | if (npages < __arraycount(spgs)) |
| 965 | pgs = spgs; |
| 966 | else { |
| 967 | if ((pgs = kmem_alloc(sizeof(*pgs) * npages, KM_NOSLEEP)) == |
| 968 | NULL) |
| 969 | return ENOMEM; |
| 970 | } |
| 971 | |
| 972 | if ((bp->b_flags & B_ASYNC) != 0 && NFS_ISV3(vp)) { |
| 973 | iomode = NFSV3WRITE_UNSTABLE; |
| 974 | } else { |
| 975 | iomode = NFSV3WRITE_FILESYNC; |
| 976 | } |
| 977 | |
| 978 | #ifndef NFS_V2_ONLY |
| 979 | again: |
| 980 | #endif |
| 981 | rw_enter(&nmp->nm_writeverflock, RW_READER); |
| 982 | |
| 983 | for (i = 0; i < npages; i++) { |
| 984 | pgs[i] = uvm_pageratop((vaddr_t)bp->b_data + (i << PAGE_SHIFT)); |
| 985 | if (pgs[i]->uobject == uobj && |
| 986 | pgs[i]->offset == uiop->uio_offset + (i << PAGE_SHIFT)) { |
| 987 | KASSERT(pgs[i]->flags & PG_BUSY); |
| 988 | /* |
| 989 | * this page belongs to our object. |
| 990 | */ |
| 991 | mutex_enter(uobj->vmobjlock); |
| 992 | /* |
| 993 | * write out the page stably if it's about to |
| 994 | * be released because we can't resend it |
| 995 | * on the server crash. |
| 996 | * |
| 997 | * XXX assuming PG_RELEASE|PG_PAGEOUT won't be |
| 998 | * changed until unbusy the page. |
| 999 | */ |
| 1000 | if (pgs[i]->flags & (PG_RELEASED|PG_PAGEOUT)) |
| 1001 | iomode = NFSV3WRITE_FILESYNC; |
| 1002 | /* |
| 1003 | * if we met a page which hasn't been sent yet, |
| 1004 | * we need do WRITE RPC. |
| 1005 | */ |
| 1006 | if ((pgs[i]->flags & PG_NEEDCOMMIT) == 0) |
| 1007 | needcommit = false; |
| 1008 | mutex_exit(uobj->vmobjlock); |
| 1009 | } else { |
| 1010 | iomode = NFSV3WRITE_FILESYNC; |
| 1011 | needcommit = false; |
| 1012 | } |
| 1013 | } |
| 1014 | if (!needcommit && iomode == NFSV3WRITE_UNSTABLE) { |
| 1015 | mutex_enter(uobj->vmobjlock); |
| 1016 | for (i = 0; i < npages; i++) { |
| 1017 | pgs[i]->flags |= PG_NEEDCOMMIT | PG_RDONLY; |
| 1018 | pmap_page_protect(pgs[i], VM_PROT_READ); |
| 1019 | } |
| 1020 | mutex_exit(uobj->vmobjlock); |
| 1021 | pageprotected = true; /* pages can't be modified during i/o. */ |
| 1022 | } else |
| 1023 | pageprotected = false; |
| 1024 | |
| 1025 | /* |
| 1026 | * Send the data to the server if necessary, |
| 1027 | * otherwise just send a commit rpc. |
| 1028 | */ |
| 1029 | #ifndef NFS_V2_ONLY |
| 1030 | if (needcommit) { |
| 1031 | |
| 1032 | /* |
| 1033 | * If the buffer is in the range that we already committed, |
| 1034 | * there's nothing to do. |
| 1035 | * |
| 1036 | * If it's in the range that we need to commit, push the |
| 1037 | * whole range at once, otherwise only push the buffer. |
| 1038 | * In both these cases, acquire the commit lock to avoid |
| 1039 | * other processes modifying the range. |
| 1040 | */ |
| 1041 | |
| 1042 | off = uiop->uio_offset; |
| 1043 | cnt = bp->b_bcount; |
| 1044 | mutex_enter(&np->n_commitlock); |
| 1045 | if (!nfs_in_committed_range(vp, off, bp->b_bcount)) { |
| 1046 | bool pushedrange; |
| 1047 | if (nfs_in_tobecommitted_range(vp, off, bp->b_bcount)) { |
| 1048 | pushedrange = true; |
| 1049 | off = np->n_pushlo; |
| 1050 | cnt = np->n_pushhi - np->n_pushlo; |
| 1051 | } else { |
| 1052 | pushedrange = false; |
| 1053 | } |
| 1054 | error = nfs_commit(vp, off, cnt, curlwp); |
| 1055 | if (error == 0) { |
| 1056 | if (pushedrange) { |
| 1057 | nfs_merge_commit_ranges(vp); |
| 1058 | } else { |
| 1059 | nfs_add_committed_range(vp, off, cnt); |
| 1060 | } |
| 1061 | } |
| 1062 | } else { |
| 1063 | error = 0; |
| 1064 | } |
| 1065 | mutex_exit(&np->n_commitlock); |
| 1066 | rw_exit(&nmp->nm_writeverflock); |
| 1067 | if (!error) { |
| 1068 | /* |
| 1069 | * pages are now on stable storage. |
| 1070 | */ |
| 1071 | uiop->uio_resid = 0; |
| 1072 | mutex_enter(uobj->vmobjlock); |
| 1073 | for (i = 0; i < npages; i++) { |
| 1074 | pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); |
| 1075 | } |
| 1076 | mutex_exit(uobj->vmobjlock); |
| 1077 | goto out; |
| 1078 | } else if (error == NFSERR_STALEWRITEVERF) { |
| 1079 | nfs_clearcommit(vp->v_mount); |
| 1080 | goto again; |
| 1081 | } |
| 1082 | if (error) { |
| 1083 | bp->b_error = np->n_error = error; |
| 1084 | np->n_flag |= NWRITEERR; |
| 1085 | } |
| 1086 | goto out; |
| 1087 | } |
| 1088 | #endif |
| 1089 | off = uiop->uio_offset; |
| 1090 | cnt = bp->b_bcount; |
| 1091 | uiop->uio_rw = UIO_WRITE; |
| 1092 | nfsstats.write_bios++; |
| 1093 | error = nfs_writerpc(vp, uiop, &iomode, pageprotected, &stalewriteverf); |
| 1094 | #ifndef NFS_V2_ONLY |
| 1095 | if (!error && iomode == NFSV3WRITE_UNSTABLE) { |
| 1096 | /* |
| 1097 | * we need to commit pages later. |
| 1098 | */ |
| 1099 | mutex_enter(&np->n_commitlock); |
| 1100 | nfs_add_tobecommitted_range(vp, off, cnt); |
| 1101 | /* |
| 1102 | * if there can be too many uncommitted pages, commit them now. |
| 1103 | */ |
| 1104 | if (np->n_pushhi - np->n_pushlo > nfs_commitsize) { |
| 1105 | off = np->n_pushlo; |
| 1106 | cnt = nfs_commitsize >> 1; |
| 1107 | error = nfs_commit(vp, off, cnt, curlwp); |
| 1108 | if (!error) { |
| 1109 | nfs_add_committed_range(vp, off, cnt); |
| 1110 | nfs_del_tobecommitted_range(vp, off, cnt); |
| 1111 | } |
| 1112 | if (error == NFSERR_STALEWRITEVERF) { |
| 1113 | stalewriteverf = true; |
| 1114 | error = 0; /* it isn't a real error */ |
| 1115 | } |
| 1116 | } else { |
| 1117 | /* |
| 1118 | * re-dirty pages so that they will be passed |
| 1119 | * to us later again. |
| 1120 | */ |
| 1121 | mutex_enter(uobj->vmobjlock); |
| 1122 | for (i = 0; i < npages; i++) { |
| 1123 | pgs[i]->flags &= ~PG_CLEAN; |
| 1124 | } |
| 1125 | mutex_exit(uobj->vmobjlock); |
| 1126 | } |
| 1127 | mutex_exit(&np->n_commitlock); |
| 1128 | } else |
| 1129 | #endif |
| 1130 | if (!error) { |
| 1131 | /* |
| 1132 | * pages are now on stable storage. |
| 1133 | */ |
| 1134 | mutex_enter(&np->n_commitlock); |
| 1135 | nfs_del_committed_range(vp, off, cnt); |
| 1136 | mutex_exit(&np->n_commitlock); |
| 1137 | mutex_enter(uobj->vmobjlock); |
| 1138 | for (i = 0; i < npages; i++) { |
| 1139 | pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); |
| 1140 | } |
| 1141 | mutex_exit(uobj->vmobjlock); |
| 1142 | } else { |
| 1143 | /* |
| 1144 | * we got an error. |
| 1145 | */ |
| 1146 | bp->b_error = np->n_error = error; |
| 1147 | np->n_flag |= NWRITEERR; |
| 1148 | } |
| 1149 | |
| 1150 | rw_exit(&nmp->nm_writeverflock); |
| 1151 | |
| 1152 | |
| 1153 | if (stalewriteverf) { |
| 1154 | nfs_clearcommit(vp->v_mount); |
| 1155 | } |
| 1156 | #ifndef NFS_V2_ONLY |
| 1157 | out: |
| 1158 | #endif |
| 1159 | if (pgs != spgs) |
| 1160 | kmem_free(pgs, sizeof(*pgs) * npages); |
| 1161 | return error; |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * nfs_doio for B_PHYS. |
| 1166 | */ |
| 1167 | static int |
| 1168 | nfs_doio_phys(struct buf *bp, struct uio *uiop) |
| 1169 | { |
| 1170 | struct vnode *vp = bp->b_vp; |
| 1171 | int error; |
| 1172 | |
| 1173 | uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT; |
| 1174 | if (bp->b_flags & B_READ) { |
| 1175 | uiop->uio_rw = UIO_READ; |
| 1176 | nfsstats.read_physios++; |
| 1177 | error = nfs_readrpc(vp, uiop); |
| 1178 | } else { |
| 1179 | int iomode = NFSV3WRITE_DATASYNC; |
| 1180 | bool stalewriteverf; |
| 1181 | struct nfsmount *nmp = VFSTONFS(vp->v_mount); |
| 1182 | |
| 1183 | uiop->uio_rw = UIO_WRITE; |
| 1184 | nfsstats.write_physios++; |
| 1185 | rw_enter(&nmp->nm_writeverflock, RW_READER); |
| 1186 | error = nfs_writerpc(vp, uiop, &iomode, false, &stalewriteverf); |
| 1187 | rw_exit(&nmp->nm_writeverflock); |
| 1188 | if (stalewriteverf) { |
| 1189 | nfs_clearcommit(bp->b_vp->v_mount); |
| 1190 | } |
| 1191 | } |
| 1192 | bp->b_error = error; |
| 1193 | return error; |
| 1194 | } |
| 1195 | |
| 1196 | /* |
| 1197 | * Do an I/O operation to/from a cache block. This may be called |
| 1198 | * synchronously or from an nfsiod. |
| 1199 | */ |
| 1200 | int |
| 1201 | nfs_doio(struct buf *bp) |
| 1202 | { |
| 1203 | int error; |
| 1204 | struct uio uio; |
| 1205 | struct uio *uiop = &uio; |
| 1206 | struct iovec io; |
| 1207 | UVMHIST_FUNC("nfs_doio" ); UVMHIST_CALLED(ubchist); |
| 1208 | |
| 1209 | uiop->uio_iov = &io; |
| 1210 | uiop->uio_iovcnt = 1; |
| 1211 | uiop->uio_offset = (((off_t)bp->b_blkno) << DEV_BSHIFT); |
| 1212 | UIO_SETUP_SYSSPACE(uiop); |
| 1213 | io.iov_base = bp->b_data; |
| 1214 | io.iov_len = uiop->uio_resid = bp->b_bcount; |
| 1215 | |
| 1216 | /* |
| 1217 | * Historically, paging was done with physio, but no more... |
| 1218 | */ |
| 1219 | if (bp->b_flags & B_PHYS) { |
| 1220 | /* |
| 1221 | * ...though reading /dev/drum still gets us here. |
| 1222 | */ |
| 1223 | error = nfs_doio_phys(bp, uiop); |
| 1224 | } else if (bp->b_flags & B_READ) { |
| 1225 | error = nfs_doio_read(bp, uiop); |
| 1226 | } else { |
| 1227 | error = nfs_doio_write(bp, uiop); |
| 1228 | } |
| 1229 | bp->b_resid = uiop->uio_resid; |
| 1230 | biodone(bp); |
| 1231 | return (error); |
| 1232 | } |
| 1233 | |
| 1234 | /* |
| 1235 | * Vnode op for VM getpages. |
| 1236 | */ |
| 1237 | |
| 1238 | int |
| 1239 | nfs_getpages(void *v) |
| 1240 | { |
| 1241 | struct vop_getpages_args /* { |
| 1242 | struct vnode *a_vp; |
| 1243 | voff_t a_offset; |
| 1244 | struct vm_page **a_m; |
| 1245 | int *a_count; |
| 1246 | int a_centeridx; |
| 1247 | vm_prot_t a_access_type; |
| 1248 | int a_advice; |
| 1249 | int a_flags; |
| 1250 | } */ *ap = v; |
| 1251 | |
| 1252 | struct vnode *vp = ap->a_vp; |
| 1253 | struct uvm_object *uobj = &vp->v_uobj; |
| 1254 | struct nfsnode *np = VTONFS(vp); |
| 1255 | const int npages = *ap->a_count; |
| 1256 | struct vm_page *pg, **pgs, **opgs, *spgs[UBC_MAX_PAGES]; |
| 1257 | off_t origoffset, len; |
| 1258 | int i, error; |
| 1259 | bool v3 = NFS_ISV3(vp); |
| 1260 | bool write = (ap->a_access_type & VM_PROT_WRITE) != 0; |
| 1261 | bool locked = (ap->a_flags & PGO_LOCKED) != 0; |
| 1262 | |
| 1263 | /* |
| 1264 | * If we are not locked we are not really using opgs, |
| 1265 | * so just initialize it |
| 1266 | */ |
| 1267 | if (!locked || npages < __arraycount(spgs)) |
| 1268 | opgs = spgs; |
| 1269 | else { |
| 1270 | if ((opgs = kmem_alloc(npages * sizeof(*opgs), KM_NOSLEEP)) == |
| 1271 | NULL) |
| 1272 | return ENOMEM; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * call the genfs code to get the pages. `pgs' may be NULL |
| 1277 | * when doing read-ahead. |
| 1278 | */ |
| 1279 | pgs = ap->a_m; |
| 1280 | if (write && locked && v3) { |
| 1281 | KASSERT(pgs != NULL); |
| 1282 | #ifdef DEBUG |
| 1283 | |
| 1284 | /* |
| 1285 | * If PGO_LOCKED is set, real pages shouldn't exists |
| 1286 | * in the array. |
| 1287 | */ |
| 1288 | |
| 1289 | for (i = 0; i < npages; i++) |
| 1290 | KDASSERT(pgs[i] == NULL || pgs[i] == PGO_DONTCARE); |
| 1291 | #endif |
| 1292 | memcpy(opgs, pgs, npages * sizeof(struct vm_pages *)); |
| 1293 | } |
| 1294 | error = genfs_getpages(v); |
| 1295 | if (error) |
| 1296 | goto out; |
| 1297 | |
| 1298 | /* |
| 1299 | * for read faults where the nfs node is not yet marked NMODIFIED, |
| 1300 | * set PG_RDONLY on the pages so that we come back here if someone |
| 1301 | * tries to modify later via the mapping that will be entered for |
| 1302 | * this fault. |
| 1303 | */ |
| 1304 | |
| 1305 | if (!write && (np->n_flag & NMODIFIED) == 0 && pgs != NULL) { |
| 1306 | if (!locked) { |
| 1307 | mutex_enter(uobj->vmobjlock); |
| 1308 | } |
| 1309 | for (i = 0; i < npages; i++) { |
| 1310 | pg = pgs[i]; |
| 1311 | if (pg == NULL || pg == PGO_DONTCARE) { |
| 1312 | continue; |
| 1313 | } |
| 1314 | pg->flags |= PG_RDONLY; |
| 1315 | } |
| 1316 | if (!locked) { |
| 1317 | mutex_exit(uobj->vmobjlock); |
| 1318 | } |
| 1319 | } |
| 1320 | if (!write) |
| 1321 | goto out; |
| 1322 | |
| 1323 | /* |
| 1324 | * this is a write fault, update the commit info. |
| 1325 | */ |
| 1326 | |
| 1327 | origoffset = ap->a_offset; |
| 1328 | len = npages << PAGE_SHIFT; |
| 1329 | |
| 1330 | if (v3) { |
| 1331 | if (!locked) { |
| 1332 | mutex_enter(&np->n_commitlock); |
| 1333 | } else { |
| 1334 | if (!mutex_tryenter(&np->n_commitlock)) { |
| 1335 | |
| 1336 | /* |
| 1337 | * Since PGO_LOCKED is set, we need to unbusy |
| 1338 | * all pages fetched by genfs_getpages() above, |
| 1339 | * tell the caller that there are no pages |
| 1340 | * available and put back original pgs array. |
| 1341 | */ |
| 1342 | |
| 1343 | mutex_enter(&uvm_pageqlock); |
| 1344 | uvm_page_unbusy(pgs, npages); |
| 1345 | mutex_exit(&uvm_pageqlock); |
| 1346 | *ap->a_count = 0; |
| 1347 | memcpy(pgs, opgs, |
| 1348 | npages * sizeof(struct vm_pages *)); |
| 1349 | error = EBUSY; |
| 1350 | goto out; |
| 1351 | } |
| 1352 | } |
| 1353 | nfs_del_committed_range(vp, origoffset, len); |
| 1354 | nfs_del_tobecommitted_range(vp, origoffset, len); |
| 1355 | } |
| 1356 | np->n_flag |= NMODIFIED; |
| 1357 | if (!locked) { |
| 1358 | mutex_enter(uobj->vmobjlock); |
| 1359 | } |
| 1360 | for (i = 0; i < npages; i++) { |
| 1361 | pg = pgs[i]; |
| 1362 | if (pg == NULL || pg == PGO_DONTCARE) { |
| 1363 | continue; |
| 1364 | } |
| 1365 | pg->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); |
| 1366 | } |
| 1367 | if (!locked) { |
| 1368 | mutex_exit(uobj->vmobjlock); |
| 1369 | } |
| 1370 | if (v3) { |
| 1371 | mutex_exit(&np->n_commitlock); |
| 1372 | } |
| 1373 | out: |
| 1374 | if (opgs != spgs) |
| 1375 | kmem_free(opgs, sizeof(*opgs) * npages); |
| 1376 | return error; |
| 1377 | } |
| 1378 | |