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--- old/usr/src/uts/common/fs/nfs/nfs_vnops.c
+++ new/usr/src/uts/common/fs/nfs/nfs_vnops.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 *
24 24 * Copyright (c) 1983,1984,1985,1986,1987,1988,1989 AT&T.
25 25 * All rights reserved.
26 26 */
27 27
28 28 /*
29 29 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
30 30 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
31 31 */
32 32
33 33 #include <sys/param.h>
34 34 #include <sys/types.h>
35 35 #include <sys/systm.h>
36 36 #include <sys/cred.h>
37 37 #include <sys/time.h>
38 38 #include <sys/vnode.h>
39 39 #include <sys/vfs.h>
40 40 #include <sys/vfs_opreg.h>
41 41 #include <sys/file.h>
42 42 #include <sys/filio.h>
43 43 #include <sys/uio.h>
44 44 #include <sys/buf.h>
45 45 #include <sys/mman.h>
46 46 #include <sys/pathname.h>
47 47 #include <sys/dirent.h>
48 48 #include <sys/debug.h>
49 49 #include <sys/vmsystm.h>
50 50 #include <sys/fcntl.h>
51 51 #include <sys/flock.h>
52 52 #include <sys/swap.h>
53 53 #include <sys/errno.h>
54 54 #include <sys/strsubr.h>
55 55 #include <sys/sysmacros.h>
56 56 #include <sys/kmem.h>
57 57 #include <sys/cmn_err.h>
58 58 #include <sys/pathconf.h>
59 59 #include <sys/utsname.h>
60 60 #include <sys/dnlc.h>
61 61 #include <sys/acl.h>
62 62 #include <sys/atomic.h>
63 63 #include <sys/policy.h>
64 64 #include <sys/sdt.h>
65 65
66 66 #include <rpc/types.h>
67 67 #include <rpc/auth.h>
68 68 #include <rpc/clnt.h>
69 69
70 70 #include <nfs/nfs.h>
71 71 #include <nfs/nfs_clnt.h>
72 72 #include <nfs/rnode.h>
73 73 #include <nfs/nfs_acl.h>
74 74 #include <nfs/lm.h>
75 75
76 76 #include <vm/hat.h>
77 77 #include <vm/as.h>
78 78 #include <vm/page.h>
79 79 #include <vm/pvn.h>
80 80 #include <vm/seg.h>
81 81 #include <vm/seg_map.h>
82 82 #include <vm/seg_kpm.h>
83 83 #include <vm/seg_vn.h>
84 84
85 85 #include <fs/fs_subr.h>
86 86
87 87 #include <sys/ddi.h>
88 88
89 89 static int nfs_rdwrlbn(vnode_t *, page_t *, u_offset_t, size_t, int,
90 90 cred_t *);
91 91 static int nfswrite(vnode_t *, caddr_t, uint_t, int, cred_t *);
92 92 static int nfsread(vnode_t *, caddr_t, uint_t, int, size_t *, cred_t *);
93 93 static int nfssetattr(vnode_t *, struct vattr *, int, cred_t *);
94 94 static int nfslookup_dnlc(vnode_t *, char *, vnode_t **, cred_t *);
95 95 static int nfslookup_otw(vnode_t *, char *, vnode_t **, cred_t *, int);
96 96 static int nfsrename(vnode_t *, char *, vnode_t *, char *, cred_t *,
97 97 caller_context_t *);
98 98 static int nfsreaddir(vnode_t *, rddir_cache *, cred_t *);
99 99 static int nfs_bio(struct buf *, cred_t *);
100 100 static int nfs_getapage(vnode_t *, u_offset_t, size_t, uint_t *,
101 101 page_t *[], size_t, struct seg *, caddr_t,
102 102 enum seg_rw, cred_t *);
103 103 static void nfs_readahead(vnode_t *, u_offset_t, caddr_t, struct seg *,
104 104 cred_t *);
105 105 static int nfs_sync_putapage(vnode_t *, page_t *, u_offset_t, size_t,
106 106 int, cred_t *);
107 107 static int nfs_sync_pageio(vnode_t *, page_t *, u_offset_t, size_t,
108 108 int, cred_t *);
109 109 static void nfs_delmap_callback(struct as *, void *, uint_t);
110 110
111 111 /*
112 112 * Error flags used to pass information about certain special errors
113 113 * which need to be handled specially.
114 114 */
115 115 #define NFS_EOF -98
116 116
117 117 /*
118 118 * These are the vnode ops routines which implement the vnode interface to
119 119 * the networked file system. These routines just take their parameters,
120 120 * make them look networkish by putting the right info into interface structs,
121 121 * and then calling the appropriate remote routine(s) to do the work.
122 122 *
123 123 * Note on directory name lookup cacheing: If we detect a stale fhandle,
124 124 * we purge the directory cache relative to that vnode. This way, the
125 125 * user won't get burned by the cache repeatedly. See <nfs/rnode.h> for
126 126 * more details on rnode locking.
127 127 */
128 128
129 129 static int nfs_open(vnode_t **, int, cred_t *, caller_context_t *);
130 130 static int nfs_close(vnode_t *, int, int, offset_t, cred_t *,
131 131 caller_context_t *);
132 132 static int nfs_read(vnode_t *, struct uio *, int, cred_t *,
133 133 caller_context_t *);
134 134 static int nfs_write(vnode_t *, struct uio *, int, cred_t *,
135 135 caller_context_t *);
136 136 static int nfs_ioctl(vnode_t *, int, intptr_t, int, cred_t *, int *,
137 137 caller_context_t *);
138 138 static int nfs_getattr(vnode_t *, struct vattr *, int, cred_t *,
139 139 caller_context_t *);
140 140 static int nfs_setattr(vnode_t *, struct vattr *, int, cred_t *,
141 141 caller_context_t *);
142 142 static int nfs_access(vnode_t *, int, int, cred_t *, caller_context_t *);
143 143 static int nfs_accessx(void *, int, cred_t *);
144 144 static int nfs_readlink(vnode_t *, struct uio *, cred_t *,
145 145 caller_context_t *);
146 146 static int nfs_fsync(vnode_t *, int, cred_t *, caller_context_t *);
147 147 static void nfs_inactive(vnode_t *, cred_t *, caller_context_t *);
148 148 static int nfs_lookup(vnode_t *, char *, vnode_t **, struct pathname *,
149 149 int, vnode_t *, cred_t *, caller_context_t *,
150 150 int *, pathname_t *);
151 151 static int nfs_create(vnode_t *, char *, struct vattr *, enum vcexcl,
152 152 int, vnode_t **, cred_t *, int, caller_context_t *,
153 153 vsecattr_t *);
154 154 static int nfs_remove(vnode_t *, char *, cred_t *, caller_context_t *,
155 155 int);
156 156 static int nfs_link(vnode_t *, vnode_t *, char *, cred_t *,
157 157 caller_context_t *, int);
158 158 static int nfs_rename(vnode_t *, char *, vnode_t *, char *, cred_t *,
159 159 caller_context_t *, int);
160 160 static int nfs_mkdir(vnode_t *, char *, struct vattr *, vnode_t **,
161 161 cred_t *, caller_context_t *, int, vsecattr_t *);
162 162 static int nfs_rmdir(vnode_t *, char *, vnode_t *, cred_t *,
163 163 caller_context_t *, int);
164 164 static int nfs_symlink(vnode_t *, char *, struct vattr *, char *,
165 165 cred_t *, caller_context_t *, int);
166 166 static int nfs_readdir(vnode_t *, struct uio *, cred_t *, int *,
167 167 caller_context_t *, int);
168 168 static int nfs_fid(vnode_t *, fid_t *, caller_context_t *);
169 169 static int nfs_rwlock(vnode_t *, int, caller_context_t *);
170 170 static void nfs_rwunlock(vnode_t *, int, caller_context_t *);
171 171 static int nfs_seek(vnode_t *, offset_t, offset_t *, caller_context_t *);
172 172 static int nfs_getpage(vnode_t *, offset_t, size_t, uint_t *,
173 173 page_t *[], size_t, struct seg *, caddr_t,
174 174 enum seg_rw, cred_t *, caller_context_t *);
175 175 static int nfs_putpage(vnode_t *, offset_t, size_t, int, cred_t *,
176 176 caller_context_t *);
177 177 static int nfs_map(vnode_t *, offset_t, struct as *, caddr_t *, size_t,
178 178 uchar_t, uchar_t, uint_t, cred_t *, caller_context_t *);
179 179 static int nfs_addmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
180 180 uchar_t, uchar_t, uint_t, cred_t *, caller_context_t *);
181 181 static int nfs_frlock(vnode_t *, int, struct flock64 *, int, offset_t,
182 182 struct flk_callback *, cred_t *, caller_context_t *);
183 183 static int nfs_space(vnode_t *, int, struct flock64 *, int, offset_t,
184 184 cred_t *, caller_context_t *);
185 185 static int nfs_realvp(vnode_t *, vnode_t **, caller_context_t *);
186 186 static int nfs_delmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
187 187 uint_t, uint_t, uint_t, cred_t *, caller_context_t *);
188 188 static int nfs_pathconf(vnode_t *, int, ulong_t *, cred_t *,
189 189 caller_context_t *);
190 190 static int nfs_pageio(vnode_t *, page_t *, u_offset_t, size_t, int,
191 191 cred_t *, caller_context_t *);
192 192 static int nfs_setsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
193 193 caller_context_t *);
194 194 static int nfs_getsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
195 195 caller_context_t *);
196 196 static int nfs_shrlock(vnode_t *, int, struct shrlock *, int, cred_t *,
197 197 caller_context_t *);
198 198
199 199 struct vnodeops *nfs_vnodeops;
200 200
201 201 const fs_operation_def_t nfs_vnodeops_template[] = {
202 202 VOPNAME_OPEN, { .vop_open = nfs_open },
203 203 VOPNAME_CLOSE, { .vop_close = nfs_close },
204 204 VOPNAME_READ, { .vop_read = nfs_read },
205 205 VOPNAME_WRITE, { .vop_write = nfs_write },
206 206 VOPNAME_IOCTL, { .vop_ioctl = nfs_ioctl },
207 207 VOPNAME_GETATTR, { .vop_getattr = nfs_getattr },
208 208 VOPNAME_SETATTR, { .vop_setattr = nfs_setattr },
209 209 VOPNAME_ACCESS, { .vop_access = nfs_access },
210 210 VOPNAME_LOOKUP, { .vop_lookup = nfs_lookup },
211 211 VOPNAME_CREATE, { .vop_create = nfs_create },
212 212 VOPNAME_REMOVE, { .vop_remove = nfs_remove },
213 213 VOPNAME_LINK, { .vop_link = nfs_link },
214 214 VOPNAME_RENAME, { .vop_rename = nfs_rename },
215 215 VOPNAME_MKDIR, { .vop_mkdir = nfs_mkdir },
216 216 VOPNAME_RMDIR, { .vop_rmdir = nfs_rmdir },
217 217 VOPNAME_READDIR, { .vop_readdir = nfs_readdir },
218 218 VOPNAME_SYMLINK, { .vop_symlink = nfs_symlink },
219 219 VOPNAME_READLINK, { .vop_readlink = nfs_readlink },
220 220 VOPNAME_FSYNC, { .vop_fsync = nfs_fsync },
221 221 VOPNAME_INACTIVE, { .vop_inactive = nfs_inactive },
222 222 VOPNAME_FID, { .vop_fid = nfs_fid },
223 223 VOPNAME_RWLOCK, { .vop_rwlock = nfs_rwlock },
224 224 VOPNAME_RWUNLOCK, { .vop_rwunlock = nfs_rwunlock },
225 225 VOPNAME_SEEK, { .vop_seek = nfs_seek },
226 226 VOPNAME_FRLOCK, { .vop_frlock = nfs_frlock },
227 227 VOPNAME_SPACE, { .vop_space = nfs_space },
228 228 VOPNAME_REALVP, { .vop_realvp = nfs_realvp },
229 229 VOPNAME_GETPAGE, { .vop_getpage = nfs_getpage },
230 230 VOPNAME_PUTPAGE, { .vop_putpage = nfs_putpage },
231 231 VOPNAME_MAP, { .vop_map = nfs_map },
232 232 VOPNAME_ADDMAP, { .vop_addmap = nfs_addmap },
233 233 VOPNAME_DELMAP, { .vop_delmap = nfs_delmap },
234 234 VOPNAME_DUMP, { .vop_dump = nfs_dump },
235 235 VOPNAME_PATHCONF, { .vop_pathconf = nfs_pathconf },
236 236 VOPNAME_PAGEIO, { .vop_pageio = nfs_pageio },
237 237 VOPNAME_SETSECATTR, { .vop_setsecattr = nfs_setsecattr },
238 238 VOPNAME_GETSECATTR, { .vop_getsecattr = nfs_getsecattr },
239 239 VOPNAME_SHRLOCK, { .vop_shrlock = nfs_shrlock },
240 240 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
241 241 NULL, NULL
242 242 };
243 243
244 244 /*
245 245 * XXX: This is referenced in modstubs.s
246 246 */
247 247 struct vnodeops *
248 248 nfs_getvnodeops(void)
249 249 {
250 250 return (nfs_vnodeops);
251 251 }
252 252
253 253 /* ARGSUSED */
254 254 static int
255 255 nfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
256 256 {
257 257 int error;
258 258 struct vattr va;
259 259 rnode_t *rp;
260 260 vnode_t *vp;
261 261
262 262 vp = *vpp;
263 263 rp = VTOR(vp);
264 264 if (nfs_zone() != VTOMI(vp)->mi_zone)
265 265 return (EIO);
266 266 mutex_enter(&rp->r_statelock);
267 267 if (rp->r_cred == NULL) {
268 268 crhold(cr);
269 269 rp->r_cred = cr;
270 270 }
271 271 mutex_exit(&rp->r_statelock);
272 272
273 273 /*
274 274 * If there is no cached data or if close-to-open
275 275 * consistency checking is turned off, we can avoid
276 276 * the over the wire getattr. Otherwise, if the
277 277 * file system is mounted readonly, then just verify
278 278 * the caches are up to date using the normal mechanism.
279 279 * Else, if the file is not mmap'd, then just mark
280 280 * the attributes as timed out. They will be refreshed
281 281 * and the caches validated prior to being used.
282 282 * Else, the file system is mounted writeable so
283 283 * force an over the wire GETATTR in order to ensure
284 284 * that all cached data is valid.
285 285 */
286 286 if (vp->v_count > 1 ||
287 287 ((vn_has_cached_data(vp) || HAVE_RDDIR_CACHE(rp)) &&
288 288 !(VTOMI(vp)->mi_flags & MI_NOCTO))) {
289 289 if (vn_is_readonly(vp))
290 290 error = nfs_validate_caches(vp, cr);
291 291 else if (rp->r_mapcnt == 0 && vp->v_count == 1) {
292 292 PURGE_ATTRCACHE(vp);
293 293 error = 0;
294 294 } else {
295 295 va.va_mask = AT_ALL;
296 296 error = nfs_getattr_otw(vp, &va, cr);
297 297 }
298 298 } else
299 299 error = 0;
300 300
301 301 return (error);
302 302 }
303 303
304 304 /* ARGSUSED */
305 305 static int
306 306 nfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr,
307 307 caller_context_t *ct)
308 308 {
309 309 rnode_t *rp;
310 310 int error;
311 311 struct vattr va;
312 312
313 313 /*
314 314 * zone_enter(2) prevents processes from changing zones with NFS files
315 315 * open; if we happen to get here from the wrong zone we can't do
316 316 * anything over the wire.
317 317 */
318 318 if (VTOMI(vp)->mi_zone != nfs_zone()) {
319 319 /*
320 320 * We could attempt to clean up locks, except we're sure
321 321 * that the current process didn't acquire any locks on
322 322 * the file: any attempt to lock a file belong to another zone
323 323 * will fail, and one can't lock an NFS file and then change
324 324 * zones, as that fails too.
325 325 *
326 326 * Returning an error here is the sane thing to do. A
327 327 * subsequent call to VN_RELE() which translates to a
328 328 * nfs_inactive() will clean up state: if the zone of the
329 329 * vnode's origin is still alive and kicking, an async worker
330 330 * thread will handle the request (from the correct zone), and
331 331 * everything (minus the final nfs_getattr_otw() call) should
332 332 * be OK. If the zone is going away nfs_async_inactive() will
333 333 * throw away cached pages inline.
334 334 */
335 335 return (EIO);
336 336 }
337 337
338 338 /*
339 339 * If we are using local locking for this filesystem, then
340 340 * release all of the SYSV style record locks. Otherwise,
341 341 * we are doing network locking and we need to release all
342 342 * of the network locks. All of the locks held by this
343 343 * process on this file are released no matter what the
344 344 * incoming reference count is.
345 345 */
346 346 if (VTOMI(vp)->mi_flags & MI_LLOCK) {
347 347 cleanlocks(vp, ttoproc(curthread)->p_pid, 0);
348 348 cleanshares(vp, ttoproc(curthread)->p_pid);
349 349 } else
350 350 nfs_lockrelease(vp, flag, offset, cr);
351 351
352 352 if (count > 1)
353 353 return (0);
354 354
355 355 /*
356 356 * If the file has been `unlinked', then purge the
357 357 * DNLC so that this vnode will get reycled quicker
358 358 * and the .nfs* file on the server will get removed.
359 359 */
360 360 rp = VTOR(vp);
361 361 if (rp->r_unldvp != NULL)
362 362 dnlc_purge_vp(vp);
363 363
364 364 /*
365 365 * If the file was open for write and there are pages,
366 366 * then if the file system was mounted using the "no-close-
367 367 * to-open" semantics, then start an asynchronous flush
368 368 * of the all of the pages in the file.
369 369 * else the file system was not mounted using the "no-close-
370 370 * to-open" semantics, then do a synchronous flush and
371 371 * commit of all of the dirty and uncommitted pages.
372 372 *
373 373 * The asynchronous flush of the pages in the "nocto" path
374 374 * mostly just associates a cred pointer with the rnode so
375 375 * writes which happen later will have a better chance of
376 376 * working. It also starts the data being written to the
377 377 * server, but without unnecessarily delaying the application.
378 378 */
379 379 if ((flag & FWRITE) && vn_has_cached_data(vp)) {
380 380 if ((VTOMI(vp)->mi_flags & MI_NOCTO)) {
381 381 error = nfs_putpage(vp, (offset_t)0, 0, B_ASYNC,
382 382 cr, ct);
383 383 if (error == EAGAIN)
384 384 error = 0;
385 385 } else
386 386 error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct);
387 387 if (!error) {
388 388 mutex_enter(&rp->r_statelock);
389 389 error = rp->r_error;
390 390 rp->r_error = 0;
391 391 mutex_exit(&rp->r_statelock);
392 392 }
393 393 } else {
394 394 mutex_enter(&rp->r_statelock);
395 395 error = rp->r_error;
396 396 rp->r_error = 0;
397 397 mutex_exit(&rp->r_statelock);
398 398 }
399 399
400 400 /*
401 401 * If RWRITEATTR is set, then issue an over the wire GETATTR to
402 402 * refresh the attribute cache with a set of attributes which
403 403 * weren't returned from a WRITE. This will enable the close-
404 404 * to-open processing to work.
405 405 */
406 406 if (rp->r_flags & RWRITEATTR)
407 407 (void) nfs_getattr_otw(vp, &va, cr);
408 408
409 409 return (error);
410 410 }
411 411
412 412 /* ARGSUSED */
413 413 static int
414 414 nfs_read(vnode_t *vp, struct uio *uiop, int ioflag, cred_t *cr,
415 415 caller_context_t *ct)
416 416 {
417 417 rnode_t *rp;
418 418 u_offset_t off;
419 419 offset_t diff;
420 420 int on;
421 421 size_t n;
422 422 caddr_t base;
423 423 uint_t flags;
424 424 int error;
425 425 mntinfo_t *mi;
426 426
427 427 rp = VTOR(vp);
428 428 mi = VTOMI(vp);
429 429
430 430 if (nfs_zone() != mi->mi_zone)
431 431 return (EIO);
432 432
433 433 ASSERT(nfs_rw_lock_held(&rp->r_rwlock, RW_READER));
434 434
435 435 if (vp->v_type != VREG)
436 436 return (EISDIR);
437 437
438 438 if (uiop->uio_resid == 0)
439 439 return (0);
440 440
441 441 if (uiop->uio_loffset > MAXOFF32_T)
442 442 return (EFBIG);
443 443
444 444 if (uiop->uio_loffset < 0 ||
445 445 uiop->uio_loffset + uiop->uio_resid > MAXOFF32_T)
446 446 return (EINVAL);
447 447
448 448 /*
449 449 * Bypass VM if caching has been disabled (e.g., locking) or if
450 450 * using client-side direct I/O and the file is not mmap'd and
451 451 * there are no cached pages.
452 452 */
453 453 if ((vp->v_flag & VNOCACHE) ||
454 454 (((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO)) &&
455 455 rp->r_mapcnt == 0 && rp->r_inmap == 0 &&
456 456 !vn_has_cached_data(vp))) {
457 457 size_t bufsize;
458 458 size_t resid = 0;
459 459
460 460 /*
461 461 * Let's try to do read in as large a chunk as we can
462 462 * (Filesystem (NFS client) bsize if possible/needed).
463 463 * For V3, this is 32K and for V2, this is 8K.
464 464 */
465 465 bufsize = MIN(uiop->uio_resid, VTOMI(vp)->mi_curread);
466 466 base = kmem_alloc(bufsize, KM_SLEEP);
467 467 do {
468 468 n = MIN(uiop->uio_resid, bufsize);
469 469 error = nfsread(vp, base, uiop->uio_offset, n,
470 470 &resid, cr);
471 471 if (!error) {
472 472 n -= resid;
473 473 error = uiomove(base, n, UIO_READ, uiop);
474 474 }
475 475 } while (!error && uiop->uio_resid > 0 && n > 0);
476 476 kmem_free(base, bufsize);
477 477 return (error);
478 478 }
479 479
480 480 error = 0;
481 481
482 482 do {
483 483 off = uiop->uio_loffset & MAXBMASK; /* mapping offset */
484 484 on = uiop->uio_loffset & MAXBOFFSET; /* Relative offset */
485 485 n = MIN(MAXBSIZE - on, uiop->uio_resid);
486 486
487 487 error = nfs_validate_caches(vp, cr);
488 488 if (error)
489 489 break;
490 490
491 491 mutex_enter(&rp->r_statelock);
492 492 while (rp->r_flags & RINCACHEPURGE) {
493 493 if (!cv_wait_sig(&rp->r_cv, &rp->r_statelock)) {
494 494 mutex_exit(&rp->r_statelock);
495 495 return (EINTR);
496 496 }
497 497 }
498 498 diff = rp->r_size - uiop->uio_loffset;
499 499 mutex_exit(&rp->r_statelock);
500 500 if (diff <= 0)
501 501 break;
502 502 if (diff < n)
503 503 n = (size_t)diff;
504 504
505 505 if (vpm_enable) {
506 506 /*
507 507 * Copy data.
508 508 */
509 509 error = vpm_data_copy(vp, off + on, n, uiop,
510 510 1, NULL, 0, S_READ);
511 511 } else {
512 512 base = segmap_getmapflt(segkmap, vp, off + on, n,
513 513 1, S_READ);
514 514 error = uiomove(base + on, n, UIO_READ, uiop);
515 515 }
516 516
517 517 if (!error) {
518 518 /*
519 519 * If read a whole block or read to eof,
520 520 * won't need this buffer again soon.
521 521 */
522 522 mutex_enter(&rp->r_statelock);
523 523 if (n + on == MAXBSIZE ||
524 524 uiop->uio_loffset == rp->r_size)
525 525 flags = SM_DONTNEED;
526 526 else
527 527 flags = 0;
528 528 mutex_exit(&rp->r_statelock);
529 529 if (vpm_enable) {
530 530 error = vpm_sync_pages(vp, off, n, flags);
531 531 } else {
532 532 error = segmap_release(segkmap, base, flags);
533 533 }
534 534 } else {
535 535 if (vpm_enable) {
536 536 (void) vpm_sync_pages(vp, off, n, 0);
537 537 } else {
538 538 (void) segmap_release(segkmap, base, 0);
539 539 }
540 540 }
541 541 } while (!error && uiop->uio_resid > 0);
542 542
543 543 return (error);
544 544 }
545 545
546 546 /* ARGSUSED */
547 547 static int
548 548 nfs_write(vnode_t *vp, struct uio *uiop, int ioflag, cred_t *cr,
549 549 caller_context_t *ct)
550 550 {
551 551 rnode_t *rp;
552 552 u_offset_t off;
553 553 caddr_t base;
554 554 uint_t flags;
555 555 int remainder;
556 556 size_t n;
557 557 int on;
558 558 int error;
559 559 int resid;
560 560 offset_t offset;
561 561 rlim_t limit;
562 562 mntinfo_t *mi;
563 563
564 564 rp = VTOR(vp);
565 565
566 566 mi = VTOMI(vp);
567 567 if (nfs_zone() != mi->mi_zone)
568 568 return (EIO);
569 569 if (vp->v_type != VREG)
570 570 return (EISDIR);
571 571
572 572 if (uiop->uio_resid == 0)
573 573 return (0);
574 574
575 575 if (ioflag & FAPPEND) {
576 576 struct vattr va;
577 577
578 578 /*
579 579 * Must serialize if appending.
580 580 */
581 581 if (nfs_rw_lock_held(&rp->r_rwlock, RW_READER)) {
582 582 nfs_rw_exit(&rp->r_rwlock);
583 583 if (nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER,
584 584 INTR(vp)))
585 585 return (EINTR);
586 586 }
587 587
588 588 va.va_mask = AT_SIZE;
589 589 error = nfsgetattr(vp, &va, cr);
590 590 if (error)
591 591 return (error);
592 592 uiop->uio_loffset = va.va_size;
593 593 }
594 594
595 595 if (uiop->uio_loffset > MAXOFF32_T)
596 596 return (EFBIG);
597 597
598 598 offset = uiop->uio_loffset + uiop->uio_resid;
599 599
600 600 if (uiop->uio_loffset < 0 || offset > MAXOFF32_T)
601 601 return (EINVAL);
602 602
603 603 if (uiop->uio_llimit > (rlim64_t)MAXOFF32_T) {
604 604 limit = MAXOFF32_T;
605 605 } else {
606 606 limit = (rlim_t)uiop->uio_llimit;
607 607 }
608 608
609 609 /*
610 610 * Check to make sure that the process will not exceed
611 611 * its limit on file size. It is okay to write up to
612 612 * the limit, but not beyond. Thus, the write which
613 613 * reaches the limit will be short and the next write
614 614 * will return an error.
615 615 */
616 616 remainder = 0;
617 617 if (offset > limit) {
618 618 remainder = offset - limit;
619 619 uiop->uio_resid = limit - uiop->uio_offset;
620 620 if (uiop->uio_resid <= 0) {
621 621 proc_t *p = ttoproc(curthread);
622 622
623 623 uiop->uio_resid += remainder;
624 624 mutex_enter(&p->p_lock);
625 625 (void) rctl_action(rctlproc_legacy[RLIMIT_FSIZE],
626 626 p->p_rctls, p, RCA_UNSAFE_SIGINFO);
627 627 mutex_exit(&p->p_lock);
628 628 return (EFBIG);
629 629 }
630 630 }
631 631
632 632 if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_READER, INTR(vp)))
633 633 return (EINTR);
634 634
635 635 /*
636 636 * Bypass VM if caching has been disabled (e.g., locking) or if
637 637 * using client-side direct I/O and the file is not mmap'd and
638 638 * there are no cached pages.
639 639 */
640 640 if ((vp->v_flag & VNOCACHE) ||
641 641 (((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO)) &&
642 642 rp->r_mapcnt == 0 && rp->r_inmap == 0 &&
643 643 !vn_has_cached_data(vp))) {
644 644 size_t bufsize;
645 645 int count;
646 646 uint_t org_offset;
647 647
648 648 nfs_fwrite:
649 649 if (rp->r_flags & RSTALE) {
650 650 resid = uiop->uio_resid;
651 651 offset = uiop->uio_loffset;
652 652 error = rp->r_error;
653 653 /*
654 654 * A close may have cleared r_error, if so,
655 655 * propagate ESTALE error return properly
656 656 */
657 657 if (error == 0)
658 658 error = ESTALE;
659 659 goto bottom;
660 660 }
661 661 bufsize = MIN(uiop->uio_resid, mi->mi_curwrite);
662 662 base = kmem_alloc(bufsize, KM_SLEEP);
663 663 do {
664 664 resid = uiop->uio_resid;
665 665 offset = uiop->uio_loffset;
666 666 count = MIN(uiop->uio_resid, bufsize);
667 667 org_offset = uiop->uio_offset;
668 668 error = uiomove(base, count, UIO_WRITE, uiop);
669 669 if (!error) {
670 670 error = nfswrite(vp, base, org_offset,
671 671 count, cr);
672 672 }
673 673 } while (!error && uiop->uio_resid > 0);
674 674 kmem_free(base, bufsize);
675 675 goto bottom;
676 676 }
677 677
678 678 do {
679 679 off = uiop->uio_loffset & MAXBMASK; /* mapping offset */
680 680 on = uiop->uio_loffset & MAXBOFFSET; /* Relative offset */
681 681 n = MIN(MAXBSIZE - on, uiop->uio_resid);
682 682
683 683 resid = uiop->uio_resid;
684 684 offset = uiop->uio_loffset;
685 685
686 686 if (rp->r_flags & RSTALE) {
687 687 error = rp->r_error;
688 688 /*
689 689 * A close may have cleared r_error, if so,
690 690 * propagate ESTALE error return properly
691 691 */
692 692 if (error == 0)
693 693 error = ESTALE;
694 694 break;
695 695 }
696 696
697 697 /*
698 698 * Don't create dirty pages faster than they
699 699 * can be cleaned so that the system doesn't
700 700 * get imbalanced. If the async queue is
701 701 * maxed out, then wait for it to drain before
702 702 * creating more dirty pages. Also, wait for
703 703 * any threads doing pagewalks in the vop_getattr
704 704 * entry points so that they don't block for
705 705 * long periods.
706 706 */
707 707 mutex_enter(&rp->r_statelock);
708 708 while ((mi->mi_max_threads != 0 &&
709 709 rp->r_awcount > 2 * mi->mi_max_threads) ||
710 710 rp->r_gcount > 0) {
711 711 if (INTR(vp)) {
712 712 klwp_t *lwp = ttolwp(curthread);
713 713
714 714 if (lwp != NULL)
715 715 lwp->lwp_nostop++;
716 716 if (!cv_wait_sig(&rp->r_cv, &rp->r_statelock)) {
717 717 mutex_exit(&rp->r_statelock);
718 718 if (lwp != NULL)
719 719 lwp->lwp_nostop--;
720 720 error = EINTR;
721 721 goto bottom;
722 722 }
723 723 if (lwp != NULL)
724 724 lwp->lwp_nostop--;
725 725 } else
726 726 cv_wait(&rp->r_cv, &rp->r_statelock);
727 727 }
728 728 mutex_exit(&rp->r_statelock);
729 729
730 730 /*
731 731 * Touch the page and fault it in if it is not in core
732 732 * before segmap_getmapflt or vpm_data_copy can lock it.
733 733 * This is to avoid the deadlock if the buffer is mapped
734 734 * to the same file through mmap which we want to write.
735 735 */
736 736 uio_prefaultpages((long)n, uiop);
737 737
738 738 if (vpm_enable) {
739 739 /*
740 740 * It will use kpm mappings, so no need to
741 741 * pass an address.
742 742 */
743 743 error = writerp(rp, NULL, n, uiop, 0);
744 744 } else {
745 745 if (segmap_kpm) {
746 746 int pon = uiop->uio_loffset & PAGEOFFSET;
747 747 size_t pn = MIN(PAGESIZE - pon,
748 748 uiop->uio_resid);
749 749 int pagecreate;
750 750
751 751 mutex_enter(&rp->r_statelock);
752 752 pagecreate = (pon == 0) && (pn == PAGESIZE ||
753 753 uiop->uio_loffset + pn >= rp->r_size);
754 754 mutex_exit(&rp->r_statelock);
755 755
756 756 base = segmap_getmapflt(segkmap, vp, off + on,
757 757 pn, !pagecreate, S_WRITE);
758 758
759 759 error = writerp(rp, base + pon, n, uiop,
760 760 pagecreate);
761 761
762 762 } else {
763 763 base = segmap_getmapflt(segkmap, vp, off + on,
764 764 n, 0, S_READ);
765 765 error = writerp(rp, base + on, n, uiop, 0);
766 766 }
767 767 }
768 768
769 769 if (!error) {
770 770 if (mi->mi_flags & MI_NOAC)
771 771 flags = SM_WRITE;
772 772 else if (n + on == MAXBSIZE || IS_SWAPVP(vp)) {
773 773 /*
774 774 * Have written a whole block.
775 775 * Start an asynchronous write
776 776 * and mark the buffer to
777 777 * indicate that it won't be
778 778 * needed again soon.
779 779 */
780 780 flags = SM_WRITE | SM_ASYNC | SM_DONTNEED;
781 781 } else
782 782 flags = 0;
783 783 if ((ioflag & (FSYNC|FDSYNC)) ||
784 784 (rp->r_flags & ROUTOFSPACE)) {
785 785 flags &= ~SM_ASYNC;
786 786 flags |= SM_WRITE;
787 787 }
788 788 if (vpm_enable) {
789 789 error = vpm_sync_pages(vp, off, n, flags);
790 790 } else {
791 791 error = segmap_release(segkmap, base, flags);
792 792 }
793 793 } else {
794 794 if (vpm_enable) {
795 795 (void) vpm_sync_pages(vp, off, n, 0);
796 796 } else {
797 797 (void) segmap_release(segkmap, base, 0);
798 798 }
799 799 /*
800 800 * In the event that we got an access error while
801 801 * faulting in a page for a write-only file just
802 802 * force a write.
803 803 */
804 804 if (error == EACCES)
805 805 goto nfs_fwrite;
806 806 }
807 807 } while (!error && uiop->uio_resid > 0);
808 808
809 809 bottom:
810 810 if (error) {
811 811 uiop->uio_resid = resid + remainder;
812 812 uiop->uio_loffset = offset;
813 813 } else
814 814 uiop->uio_resid += remainder;
815 815
816 816 nfs_rw_exit(&rp->r_lkserlock);
817 817
818 818 return (error);
819 819 }
820 820
821 821 /*
822 822 * Flags are composed of {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED}
823 823 */
824 824 static int
825 825 nfs_rdwrlbn(vnode_t *vp, page_t *pp, u_offset_t off, size_t len,
826 826 int flags, cred_t *cr)
827 827 {
828 828 struct buf *bp;
829 829 int error;
830 830
831 831 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
832 832 bp = pageio_setup(pp, len, vp, flags);
833 833 ASSERT(bp != NULL);
834 834
835 835 /*
836 836 * pageio_setup should have set b_addr to 0. This
837 837 * is correct since we want to do I/O on a page
838 838 * boundary. bp_mapin will use this addr to calculate
839 839 * an offset, and then set b_addr to the kernel virtual
840 840 * address it allocated for us.
841 841 */
842 842 ASSERT(bp->b_un.b_addr == 0);
843 843
844 844 bp->b_edev = 0;
845 845 bp->b_dev = 0;
846 846 bp->b_lblkno = lbtodb(off);
847 847 bp->b_file = vp;
848 848 bp->b_offset = (offset_t)off;
849 849 bp_mapin(bp);
850 850
851 851 error = nfs_bio(bp, cr);
852 852
853 853 bp_mapout(bp);
854 854 pageio_done(bp);
855 855
856 856 return (error);
857 857 }
858 858
859 859 /*
860 860 * Write to file. Writes to remote server in largest size
861 861 * chunks that the server can handle. Write is synchronous.
862 862 */
863 863 static int
864 864 nfswrite(vnode_t *vp, caddr_t base, uint_t offset, int count, cred_t *cr)
865 865 {
866 866 rnode_t *rp;
867 867 mntinfo_t *mi;
868 868 struct nfswriteargs wa;
869 869 struct nfsattrstat ns;
870 870 int error;
871 871 int tsize;
872 872 int douprintf;
873 873
874 874 douprintf = 1;
875 875
876 876 rp = VTOR(vp);
877 877 mi = VTOMI(vp);
878 878
879 879 ASSERT(nfs_zone() == mi->mi_zone);
880 880
881 881 wa.wa_args = &wa.wa_args_buf;
882 882 wa.wa_fhandle = *VTOFH(vp);
883 883
884 884 do {
885 885 tsize = MIN(mi->mi_curwrite, count);
886 886 wa.wa_data = base;
887 887 wa.wa_begoff = offset;
888 888 wa.wa_totcount = tsize;
889 889 wa.wa_count = tsize;
890 890 wa.wa_offset = offset;
891 891
892 892 if (mi->mi_io_kstats) {
893 893 mutex_enter(&mi->mi_lock);
894 894 kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats));
895 895 mutex_exit(&mi->mi_lock);
896 896 }
897 897 wa.wa_mblk = NULL;
898 898 do {
899 899 error = rfs2call(mi, RFS_WRITE,
900 900 xdr_writeargs, (caddr_t)&wa,
901 901 xdr_attrstat, (caddr_t)&ns, cr,
902 902 &douprintf, &ns.ns_status, 0, NULL);
903 903 } while (error == ENFS_TRYAGAIN);
904 904 if (mi->mi_io_kstats) {
905 905 mutex_enter(&mi->mi_lock);
906 906 kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats));
907 907 mutex_exit(&mi->mi_lock);
908 908 }
909 909
910 910 if (!error) {
911 911 error = geterrno(ns.ns_status);
912 912 /*
913 913 * Can't check for stale fhandle and purge caches
914 914 * here because pages are held by nfs_getpage.
915 915 * Just mark the attribute cache as timed out
916 916 * and set RWRITEATTR to indicate that the file
917 917 * was modified with a WRITE operation.
918 918 */
919 919 if (!error) {
920 920 count -= tsize;
921 921 base += tsize;
922 922 offset += tsize;
923 923 if (mi->mi_io_kstats) {
924 924 mutex_enter(&mi->mi_lock);
925 925 KSTAT_IO_PTR(mi->mi_io_kstats)->
926 926 writes++;
927 927 KSTAT_IO_PTR(mi->mi_io_kstats)->
928 928 nwritten += tsize;
929 929 mutex_exit(&mi->mi_lock);
930 930 }
931 931 lwp_stat_update(LWP_STAT_OUBLK, 1);
932 932 mutex_enter(&rp->r_statelock);
933 933 PURGE_ATTRCACHE_LOCKED(rp);
934 934 rp->r_flags |= RWRITEATTR;
935 935 mutex_exit(&rp->r_statelock);
936 936 }
937 937 }
938 938 } while (!error && count);
939 939
940 940 return (error);
941 941 }
942 942
943 943 /*
944 944 * Read from a file. Reads data in largest chunks our interface can handle.
945 945 */
946 946 static int
947 947 nfsread(vnode_t *vp, caddr_t base, uint_t offset,
948 948 int count, size_t *residp, cred_t *cr)
949 949 {
950 950 mntinfo_t *mi;
951 951 struct nfsreadargs ra;
952 952 struct nfsrdresult rr;
953 953 int tsize;
954 954 int error;
955 955 int douprintf;
956 956 failinfo_t fi;
957 957 rnode_t *rp;
958 958 struct vattr va;
959 959 hrtime_t t;
960 960
961 961 rp = VTOR(vp);
962 962 mi = VTOMI(vp);
963 963
964 964 ASSERT(nfs_zone() == mi->mi_zone);
965 965
966 966 douprintf = 1;
967 967
968 968 ra.ra_fhandle = *VTOFH(vp);
969 969
970 970 fi.vp = vp;
971 971 fi.fhp = (caddr_t)&ra.ra_fhandle;
972 972 fi.copyproc = nfscopyfh;
973 973 fi.lookupproc = nfslookup;
974 974 fi.xattrdirproc = acl_getxattrdir2;
975 975
976 976 do {
977 977 if (mi->mi_io_kstats) {
978 978 mutex_enter(&mi->mi_lock);
979 979 kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats));
980 980 mutex_exit(&mi->mi_lock);
981 981 }
982 982
983 983 do {
984 984 tsize = MIN(mi->mi_curread, count);
985 985 rr.rr_data = base;
986 986 ra.ra_offset = offset;
987 987 ra.ra_totcount = tsize;
988 988 ra.ra_count = tsize;
989 989 ra.ra_data = base;
990 990 t = gethrtime();
991 991 error = rfs2call(mi, RFS_READ,
992 992 xdr_readargs, (caddr_t)&ra,
993 993 xdr_rdresult, (caddr_t)&rr, cr,
994 994 &douprintf, &rr.rr_status, 0, &fi);
995 995 } while (error == ENFS_TRYAGAIN);
996 996
997 997 if (mi->mi_io_kstats) {
998 998 mutex_enter(&mi->mi_lock);
999 999 kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats));
1000 1000 mutex_exit(&mi->mi_lock);
1001 1001 }
1002 1002
1003 1003 if (!error) {
1004 1004 error = geterrno(rr.rr_status);
1005 1005 if (!error) {
1006 1006 count -= rr.rr_count;
1007 1007 base += rr.rr_count;
1008 1008 offset += rr.rr_count;
1009 1009 if (mi->mi_io_kstats) {
1010 1010 mutex_enter(&mi->mi_lock);
1011 1011 KSTAT_IO_PTR(mi->mi_io_kstats)->reads++;
1012 1012 KSTAT_IO_PTR(mi->mi_io_kstats)->nread +=
1013 1013 rr.rr_count;
1014 1014 mutex_exit(&mi->mi_lock);
1015 1015 }
1016 1016 lwp_stat_update(LWP_STAT_INBLK, 1);
1017 1017 }
1018 1018 }
1019 1019 } while (!error && count && rr.rr_count == tsize);
1020 1020
1021 1021 *residp = count;
1022 1022
1023 1023 if (!error) {
1024 1024 /*
1025 1025 * Since no error occurred, we have the current
1026 1026 * attributes and we need to do a cache check and then
1027 1027 * potentially update the cached attributes. We can't
1028 1028 * use the normal attribute check and cache mechanisms
1029 1029 * because they might cause a cache flush which would
1030 1030 * deadlock. Instead, we just check the cache to see
1031 1031 * if the attributes have changed. If it is, then we
1032 1032 * just mark the attributes as out of date. The next
1033 1033 * time that the attributes are checked, they will be
1034 1034 * out of date, new attributes will be fetched, and
1035 1035 * the page cache will be flushed. If the attributes
1036 1036 * weren't changed, then we just update the cached
1037 1037 * attributes with these attributes.
1038 1038 */
1039 1039 /*
1040 1040 * If NFS_ACL is supported on the server, then the
1041 1041 * attributes returned by server may have minimal
1042 1042 * permissions sometimes denying access to users having
1043 1043 * proper access. To get the proper attributes, mark
1044 1044 * the attributes as expired so that they will be
1045 1045 * regotten via the NFS_ACL GETATTR2 procedure.
1046 1046 */
1047 1047 error = nattr_to_vattr(vp, &rr.rr_attr, &va);
1048 1048 mutex_enter(&rp->r_statelock);
1049 1049 if (error || !CACHE_VALID(rp, va.va_mtime, va.va_size) ||
1050 1050 (mi->mi_flags & MI_ACL)) {
1051 1051 mutex_exit(&rp->r_statelock);
1052 1052 PURGE_ATTRCACHE(vp);
1053 1053 } else {
1054 1054 if (rp->r_mtime <= t) {
1055 1055 nfs_attrcache_va(vp, &va);
1056 1056 }
1057 1057 mutex_exit(&rp->r_statelock);
1058 1058 }
1059 1059 }
1060 1060
1061 1061 return (error);
1062 1062 }
1063 1063
1064 1064 /* ARGSUSED */
1065 1065 static int
1066 1066 nfs_ioctl(vnode_t *vp, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp,
1067 1067 caller_context_t *ct)
1068 1068 {
1069 1069
1070 1070 if (nfs_zone() != VTOMI(vp)->mi_zone)
1071 1071 return (EIO);
1072 1072 switch (cmd) {
1073 1073 case _FIODIRECTIO:
1074 1074 return (nfs_directio(vp, (int)arg, cr));
1075 1075 default:
1076 1076 return (ENOTTY);
1077 1077 }
1078 1078 }
1079 1079
1080 1080 /* ARGSUSED */
1081 1081 static int
1082 1082 nfs_getattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr,
1083 1083 caller_context_t *ct)
1084 1084 {
1085 1085 int error;
1086 1086 rnode_t *rp;
1087 1087
1088 1088 if (nfs_zone() != VTOMI(vp)->mi_zone)
1089 1089 return (EIO);
1090 1090 /*
1091 1091 * If it has been specified that the return value will
1092 1092 * just be used as a hint, and we are only being asked
1093 1093 * for size, fsid or rdevid, then return the client's
1094 1094 * notion of these values without checking to make sure
1095 1095 * that the attribute cache is up to date.
1096 1096 * The whole point is to avoid an over the wire GETATTR
1097 1097 * call.
1098 1098 */
1099 1099 rp = VTOR(vp);
1100 1100 if (flags & ATTR_HINT) {
1101 1101 if (vap->va_mask ==
1102 1102 (vap->va_mask & (AT_SIZE | AT_FSID | AT_RDEV))) {
1103 1103 mutex_enter(&rp->r_statelock);
1104 1104 if (vap->va_mask | AT_SIZE)
1105 1105 vap->va_size = rp->r_size;
1106 1106 if (vap->va_mask | AT_FSID)
1107 1107 vap->va_fsid = rp->r_attr.va_fsid;
1108 1108 if (vap->va_mask | AT_RDEV)
1109 1109 vap->va_rdev = rp->r_attr.va_rdev;
1110 1110 mutex_exit(&rp->r_statelock);
1111 1111 return (0);
1112 1112 }
1113 1113 }
1114 1114
1115 1115 /*
1116 1116 * Only need to flush pages if asking for the mtime
1117 1117 * and if there any dirty pages or any outstanding
1118 1118 * asynchronous (write) requests for this file.
1119 1119 */
1120 1120 if (vap->va_mask & AT_MTIME) {
1121 1121 if (vn_has_cached_data(vp) &&
1122 1122 ((rp->r_flags & RDIRTY) || rp->r_awcount > 0)) {
1123 1123 mutex_enter(&rp->r_statelock);
1124 1124 rp->r_gcount++;
1125 1125 mutex_exit(&rp->r_statelock);
1126 1126 error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct);
1127 1127 mutex_enter(&rp->r_statelock);
1128 1128 if (error && (error == ENOSPC || error == EDQUOT)) {
1129 1129 if (!rp->r_error)
1130 1130 rp->r_error = error;
1131 1131 }
1132 1132 if (--rp->r_gcount == 0)
1133 1133 cv_broadcast(&rp->r_cv);
1134 1134 mutex_exit(&rp->r_statelock);
1135 1135 }
1136 1136 }
1137 1137
1138 1138 return (nfsgetattr(vp, vap, cr));
1139 1139 }
1140 1140
1141 1141 /*ARGSUSED4*/
1142 1142 static int
1143 1143 nfs_setattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr,
1144 1144 caller_context_t *ct)
1145 1145 {
1146 1146 int error;
1147 1147 uint_t mask;
1148 1148 struct vattr va;
1149 1149
1150 1150 mask = vap->va_mask;
1151 1151
1152 1152 if (mask & AT_NOSET)
1153 1153 return (EINVAL);
1154 1154
1155 1155 if ((mask & AT_SIZE) &&
1156 1156 vap->va_type == VREG &&
1157 1157 vap->va_size > MAXOFF32_T)
1158 1158 return (EFBIG);
1159 1159
1160 1160 if (nfs_zone() != VTOMI(vp)->mi_zone)
1161 1161 return (EIO);
1162 1162
1163 1163 va.va_mask = AT_UID | AT_MODE;
1164 1164
1165 1165 error = nfsgetattr(vp, &va, cr);
1166 1166 if (error)
1167 1167 return (error);
1168 1168
1169 1169 error = secpolicy_vnode_setattr(cr, vp, vap, &va, flags, nfs_accessx,
1170 1170 vp);
1171 1171
1172 1172 if (error)
1173 1173 return (error);
1174 1174
1175 1175 error = nfssetattr(vp, vap, flags, cr);
1176 1176
1177 1177 if (error == 0 && (mask & AT_SIZE)) {
1178 1178 if (vap->va_size == 0) {
1179 1179 vnevent_truncate(vp, ct);
1180 1180 } else {
1181 1181 vnevent_resize(vp, ct);
1182 1182 }
1183 1183 }
1184 1184
1185 1185 return (error);
1186 1186 }
1187 1187
1188 1188 static int
1189 1189 nfssetattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr)
1190 1190 {
1191 1191 int error;
1192 1192 uint_t mask;
1193 1193 struct nfssaargs args;
1194 1194 struct nfsattrstat ns;
1195 1195 int douprintf;
1196 1196 rnode_t *rp;
1197 1197 struct vattr va;
1198 1198 mode_t omode;
1199 1199 mntinfo_t *mi;
1200 1200 vsecattr_t *vsp;
1201 1201 hrtime_t t;
1202 1202
1203 1203 mask = vap->va_mask;
1204 1204
1205 1205 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
1206 1206
1207 1207 rp = VTOR(vp);
1208 1208
1209 1209 /*
1210 1210 * Only need to flush pages if there are any pages and
1211 1211 * if the file is marked as dirty in some fashion. The
1212 1212 * file must be flushed so that we can accurately
1213 1213 * determine the size of the file and the cached data
1214 1214 * after the SETATTR returns. A file is considered to
1215 1215 * be dirty if it is either marked with RDIRTY, has
1216 1216 * outstanding i/o's active, or is mmap'd. In this
1217 1217 * last case, we can't tell whether there are dirty
1218 1218 * pages, so we flush just to be sure.
1219 1219 */
1220 1220 if (vn_has_cached_data(vp) &&
1221 1221 ((rp->r_flags & RDIRTY) ||
1222 1222 rp->r_count > 0 ||
1223 1223 rp->r_mapcnt > 0)) {
1224 1224 ASSERT(vp->v_type != VCHR);
1225 1225 error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, NULL);
1226 1226 if (error && (error == ENOSPC || error == EDQUOT)) {
1227 1227 mutex_enter(&rp->r_statelock);
1228 1228 if (!rp->r_error)
1229 1229 rp->r_error = error;
1230 1230 mutex_exit(&rp->r_statelock);
1231 1231 }
1232 1232 }
1233 1233
1234 1234 /*
1235 1235 * If the system call was utime(2) or utimes(2) and the
1236 1236 * application did not specify the times, then set the
1237 1237 * mtime nanosecond field to 1 billion. This will get
1238 1238 * translated from 1 billion nanoseconds to 1 million
1239 1239 * microseconds in the over the wire request. The
1240 1240 * server will use 1 million in the microsecond field
1241 1241 * to tell whether both the mtime and atime should be
1242 1242 * set to the server's current time.
1243 1243 *
1244 1244 * This is an overload of the protocol and should be
1245 1245 * documented in the NFS Version 2 protocol specification.
1246 1246 */
1247 1247 if ((mask & AT_MTIME) && !(flags & ATTR_UTIME)) {
1248 1248 vap->va_mtime.tv_nsec = 1000000000;
1249 1249 if (NFS_TIME_T_OK(vap->va_mtime.tv_sec) &&
1250 1250 NFS_TIME_T_OK(vap->va_atime.tv_sec)) {
1251 1251 error = vattr_to_sattr(vap, &args.saa_sa);
1252 1252 } else {
1253 1253 /*
1254 1254 * Use server times. vap time values will not be used.
1255 1255 * To ensure no time overflow, make sure vap has
1256 1256 * valid values, but retain the original values.
1257 1257 */
1258 1258 timestruc_t mtime = vap->va_mtime;
1259 1259 timestruc_t atime = vap->va_atime;
1260 1260 time_t now;
1261 1261
1262 1262 now = gethrestime_sec();
1263 1263 if (NFS_TIME_T_OK(now)) {
1264 1264 /* Just in case server does not know of this */
1265 1265 vap->va_mtime.tv_sec = now;
1266 1266 vap->va_atime.tv_sec = now;
1267 1267 } else {
1268 1268 vap->va_mtime.tv_sec = 0;
1269 1269 vap->va_atime.tv_sec = 0;
1270 1270 }
1271 1271 error = vattr_to_sattr(vap, &args.saa_sa);
1272 1272 /* set vap times back on */
1273 1273 vap->va_mtime = mtime;
1274 1274 vap->va_atime = atime;
1275 1275 }
1276 1276 } else {
1277 1277 /* Either do not set times or use the client specified times */
1278 1278 error = vattr_to_sattr(vap, &args.saa_sa);
1279 1279 }
1280 1280 if (error) {
1281 1281 /* req time field(s) overflow - return immediately */
1282 1282 return (error);
1283 1283 }
1284 1284 args.saa_fh = *VTOFH(vp);
1285 1285
1286 1286 va.va_mask = AT_MODE;
1287 1287 error = nfsgetattr(vp, &va, cr);
1288 1288 if (error)
1289 1289 return (error);
1290 1290 omode = va.va_mode;
1291 1291
1292 1292 mi = VTOMI(vp);
1293 1293
1294 1294 douprintf = 1;
1295 1295
1296 1296 t = gethrtime();
1297 1297
1298 1298 error = rfs2call(mi, RFS_SETATTR,
1299 1299 xdr_saargs, (caddr_t)&args,
1300 1300 xdr_attrstat, (caddr_t)&ns, cr,
1301 1301 &douprintf, &ns.ns_status, 0, NULL);
1302 1302
1303 1303 /*
1304 1304 * Purge the access cache and ACL cache if changing either the
1305 1305 * owner of the file, the group owner, or the mode. These may
1306 1306 * change the access permissions of the file, so purge old
1307 1307 * information and start over again.
1308 1308 */
1309 1309 if ((mask & (AT_UID | AT_GID | AT_MODE)) && (mi->mi_flags & MI_ACL)) {
1310 1310 (void) nfs_access_purge_rp(rp);
1311 1311 if (rp->r_secattr != NULL) {
1312 1312 mutex_enter(&rp->r_statelock);
1313 1313 vsp = rp->r_secattr;
1314 1314 rp->r_secattr = NULL;
1315 1315 mutex_exit(&rp->r_statelock);
1316 1316 if (vsp != NULL)
1317 1317 nfs_acl_free(vsp);
1318 1318 }
1319 1319 }
1320 1320
1321 1321 if (!error) {
1322 1322 error = geterrno(ns.ns_status);
1323 1323 if (!error) {
1324 1324 /*
1325 1325 * If changing the size of the file, invalidate
1326 1326 * any local cached data which is no longer part
1327 1327 * of the file. We also possibly invalidate the
1328 1328 * last page in the file. We could use
1329 1329 * pvn_vpzero(), but this would mark the page as
1330 1330 * modified and require it to be written back to
1331 1331 * the server for no particularly good reason.
1332 1332 * This way, if we access it, then we bring it
1333 1333 * back in. A read should be cheaper than a
1334 1334 * write.
1335 1335 */
1336 1336 if (mask & AT_SIZE) {
1337 1337 nfs_invalidate_pages(vp,
1338 1338 (vap->va_size & PAGEMASK), cr);
1339 1339 }
1340 1340 (void) nfs_cache_fattr(vp, &ns.ns_attr, &va, t, cr);
1341 1341 /*
1342 1342 * If NFS_ACL is supported on the server, then the
1343 1343 * attributes returned by server may have minimal
1344 1344 * permissions sometimes denying access to users having
1345 1345 * proper access. To get the proper attributes, mark
1346 1346 * the attributes as expired so that they will be
1347 1347 * regotten via the NFS_ACL GETATTR2 procedure.
1348 1348 */
1349 1349 if (mi->mi_flags & MI_ACL) {
1350 1350 PURGE_ATTRCACHE(vp);
1351 1351 }
1352 1352 /*
1353 1353 * This next check attempts to deal with NFS
1354 1354 * servers which can not handle increasing
1355 1355 * the size of the file via setattr. Most
1356 1356 * of these servers do not return an error,
1357 1357 * but do not change the size of the file.
1358 1358 * Hence, this check and then attempt to set
1359 1359 * the file size by writing 1 byte at the
1360 1360 * offset of the end of the file that we need.
1361 1361 */
1362 1362 if ((mask & AT_SIZE) &&
1363 1363 ns.ns_attr.na_size < (uint32_t)vap->va_size) {
1364 1364 char zb = '\0';
1365 1365
1366 1366 error = nfswrite(vp, &zb,
1367 1367 vap->va_size - sizeof (zb),
1368 1368 sizeof (zb), cr);
1369 1369 }
1370 1370 /*
1371 1371 * Some servers will change the mode to clear the setuid
1372 1372 * and setgid bits when changing the uid or gid. The
1373 1373 * client needs to compensate appropriately.
1374 1374 */
1375 1375 if (mask & (AT_UID | AT_GID)) {
1376 1376 int terror;
1377 1377
1378 1378 va.va_mask = AT_MODE;
1379 1379 terror = nfsgetattr(vp, &va, cr);
1380 1380 if (!terror &&
1381 1381 (((mask & AT_MODE) &&
1382 1382 va.va_mode != vap->va_mode) ||
1383 1383 (!(mask & AT_MODE) &&
1384 1384 va.va_mode != omode))) {
1385 1385 va.va_mask = AT_MODE;
1386 1386 if (mask & AT_MODE)
1387 1387 va.va_mode = vap->va_mode;
1388 1388 else
1389 1389 va.va_mode = omode;
1390 1390 (void) nfssetattr(vp, &va, 0, cr);
1391 1391 }
1392 1392 }
1393 1393 } else {
1394 1394 PURGE_ATTRCACHE(vp);
1395 1395 PURGE_STALE_FH(error, vp, cr);
1396 1396 }
1397 1397 } else {
1398 1398 PURGE_ATTRCACHE(vp);
1399 1399 }
1400 1400
1401 1401 return (error);
1402 1402 }
1403 1403
1404 1404 static int
1405 1405 nfs_accessx(void *vp, int mode, cred_t *cr)
1406 1406 {
1407 1407 ASSERT(nfs_zone() == VTOMI((vnode_t *)vp)->mi_zone);
1408 1408 return (nfs_access(vp, mode, 0, cr, NULL));
1409 1409 }
1410 1410
1411 1411 /* ARGSUSED */
1412 1412 static int
1413 1413 nfs_access(vnode_t *vp, int mode, int flags, cred_t *cr, caller_context_t *ct)
1414 1414 {
1415 1415 struct vattr va;
1416 1416 int error;
1417 1417 mntinfo_t *mi;
1418 1418 int shift = 0;
1419 1419
1420 1420 mi = VTOMI(vp);
1421 1421
1422 1422 if (nfs_zone() != mi->mi_zone)
1423 1423 return (EIO);
1424 1424 if (mi->mi_flags & MI_ACL) {
1425 1425 error = acl_access2(vp, mode, flags, cr);
1426 1426 if (mi->mi_flags & MI_ACL)
1427 1427 return (error);
1428 1428 }
1429 1429
1430 1430 va.va_mask = AT_MODE | AT_UID | AT_GID;
1431 1431 error = nfsgetattr(vp, &va, cr);
1432 1432 if (error)
1433 1433 return (error);
1434 1434
1435 1435 /*
1436 1436 * Disallow write attempts on read-only
1437 1437 * file systems, unless the file is a
1438 1438 * device node.
1439 1439 */
1440 1440 if ((mode & VWRITE) && vn_is_readonly(vp) && !IS_DEVVP(vp))
1441 1441 return (EROFS);
1442 1442
1443 1443 /*
1444 1444 * Disallow attempts to access mandatory lock files.
1445 1445 */
1446 1446 if ((mode & (VWRITE | VREAD | VEXEC)) &&
1447 1447 MANDLOCK(vp, va.va_mode))
1448 1448 return (EACCES);
1449 1449
1450 1450 /*
1451 1451 * Access check is based on only
1452 1452 * one of owner, group, public.
1453 1453 * If not owner, then check group.
1454 1454 * If not a member of the group,
1455 1455 * then check public access.
1456 1456 */
1457 1457 if (crgetuid(cr) != va.va_uid) {
1458 1458 shift += 3;
1459 1459 if (!groupmember(va.va_gid, cr))
1460 1460 shift += 3;
1461 1461 }
1462 1462
1463 1463 return (secpolicy_vnode_access2(cr, vp, va.va_uid,
1464 1464 va.va_mode << shift, mode));
1465 1465 }
1466 1466
1467 1467 static int nfs_do_symlink_cache = 1;
1468 1468
1469 1469 /* ARGSUSED */
1470 1470 static int
1471 1471 nfs_readlink(vnode_t *vp, struct uio *uiop, cred_t *cr, caller_context_t *ct)
1472 1472 {
1473 1473 int error;
1474 1474 struct nfsrdlnres rl;
1475 1475 rnode_t *rp;
1476 1476 int douprintf;
1477 1477 failinfo_t fi;
1478 1478
1479 1479 /*
1480 1480 * We want to be consistent with UFS semantics so we will return
1481 1481 * EINVAL instead of ENXIO. This violates the XNFS spec and
1482 1482 * the RFC 1094, which are wrong any way. BUGID 1138002.
1483 1483 */
1484 1484 if (vp->v_type != VLNK)
1485 1485 return (EINVAL);
1486 1486
1487 1487 if (nfs_zone() != VTOMI(vp)->mi_zone)
1488 1488 return (EIO);
1489 1489
1490 1490 rp = VTOR(vp);
1491 1491 if (nfs_do_symlink_cache && rp->r_symlink.contents != NULL) {
1492 1492 error = nfs_validate_caches(vp, cr);
1493 1493 if (error)
1494 1494 return (error);
1495 1495 mutex_enter(&rp->r_statelock);
1496 1496 if (rp->r_symlink.contents != NULL) {
1497 1497 error = uiomove(rp->r_symlink.contents,
1498 1498 rp->r_symlink.len, UIO_READ, uiop);
1499 1499 mutex_exit(&rp->r_statelock);
1500 1500 return (error);
1501 1501 }
1502 1502 mutex_exit(&rp->r_statelock);
1503 1503 }
1504 1504
1505 1505
1506 1506 rl.rl_data = kmem_alloc(NFS_MAXPATHLEN, KM_SLEEP);
1507 1507
1508 1508 fi.vp = vp;
1509 1509 fi.fhp = NULL; /* no need to update, filehandle not copied */
1510 1510 fi.copyproc = nfscopyfh;
1511 1511 fi.lookupproc = nfslookup;
1512 1512 fi.xattrdirproc = acl_getxattrdir2;
1513 1513
1514 1514 douprintf = 1;
1515 1515
1516 1516 error = rfs2call(VTOMI(vp), RFS_READLINK,
1517 1517 xdr_readlink, (caddr_t)VTOFH(vp),
1518 1518 xdr_rdlnres, (caddr_t)&rl, cr,
1519 1519 &douprintf, &rl.rl_status, 0, &fi);
1520 1520
1521 1521 if (error) {
1522 1522
1523 1523 kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN);
1524 1524 return (error);
1525 1525 }
1526 1526
1527 1527 error = geterrno(rl.rl_status);
1528 1528 if (!error) {
1529 1529 error = uiomove(rl.rl_data, (int)rl.rl_count, UIO_READ, uiop);
1530 1530 if (nfs_do_symlink_cache && rp->r_symlink.contents == NULL) {
1531 1531 mutex_enter(&rp->r_statelock);
1532 1532 if (rp->r_symlink.contents == NULL) {
1533 1533 rp->r_symlink.contents = rl.rl_data;
1534 1534 rp->r_symlink.len = (int)rl.rl_count;
1535 1535 rp->r_symlink.size = NFS_MAXPATHLEN;
1536 1536 mutex_exit(&rp->r_statelock);
1537 1537 } else {
1538 1538 mutex_exit(&rp->r_statelock);
1539 1539
1540 1540 kmem_free((void *)rl.rl_data,
1541 1541 NFS_MAXPATHLEN);
1542 1542 }
1543 1543 } else {
1544 1544
1545 1545 kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN);
1546 1546 }
1547 1547 } else {
1548 1548 PURGE_STALE_FH(error, vp, cr);
1549 1549
1550 1550 kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN);
1551 1551 }
1552 1552
1553 1553 /*
1554 1554 * Conform to UFS semantics (see comment above)
1555 1555 */
1556 1556 return (error == ENXIO ? EINVAL : error);
1557 1557 }
1558 1558
1559 1559 /*
1560 1560 * Flush local dirty pages to stable storage on the server.
1561 1561 *
1562 1562 * If FNODSYNC is specified, then there is nothing to do because
1563 1563 * metadata changes are not cached on the client before being
1564 1564 * sent to the server.
1565 1565 */
1566 1566 /* ARGSUSED */
1567 1567 static int
1568 1568 nfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct)
1569 1569 {
1570 1570 int error;
1571 1571
1572 1572 if ((syncflag & FNODSYNC) || IS_SWAPVP(vp))
1573 1573 return (0);
1574 1574
1575 1575 if (nfs_zone() != VTOMI(vp)->mi_zone)
1576 1576 return (EIO);
1577 1577
1578 1578 error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct);
1579 1579 if (!error)
1580 1580 error = VTOR(vp)->r_error;
1581 1581 return (error);
1582 1582 }
1583 1583
1584 1584
1585 1585 /*
1586 1586 * Weirdness: if the file was removed or the target of a rename
1587 1587 * operation while it was open, it got renamed instead. Here we
1588 1588 * remove the renamed file.
1589 1589 */
1590 1590 /* ARGSUSED */
1591 1591 static void
1592 1592 nfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
1593 1593 {
1594 1594 rnode_t *rp;
1595 1595
1596 1596 ASSERT(vp != DNLC_NO_VNODE);
1597 1597
1598 1598 /*
1599 1599 * If this is coming from the wrong zone, we let someone in the right
1600 1600 * zone take care of it asynchronously. We can get here due to
1601 1601 * VN_RELE() being called from pageout() or fsflush(). This call may
1602 1602 * potentially turn into an expensive no-op if, for instance, v_count
1603 1603 * gets incremented in the meantime, but it's still correct.
1604 1604 */
1605 1605 if (nfs_zone() != VTOMI(vp)->mi_zone) {
1606 1606 nfs_async_inactive(vp, cr, nfs_inactive);
1607 1607 return;
1608 1608 }
1609 1609
1610 1610 rp = VTOR(vp);
1611 1611 redo:
1612 1612 if (rp->r_unldvp != NULL) {
1613 1613 /*
1614 1614 * Save the vnode pointer for the directory where the
1615 1615 * unlinked-open file got renamed, then set it to NULL
1616 1616 * to prevent another thread from getting here before
1617 1617 * we're done with the remove. While we have the
1618 1618 * statelock, make local copies of the pertinent rnode
1619 1619 * fields. If we weren't to do this in an atomic way, the
1620 1620 * the unl* fields could become inconsistent with respect
1621 1621 * to each other due to a race condition between this
1622 1622 * code and nfs_remove(). See bug report 1034328.
1623 1623 */
1624 1624 mutex_enter(&rp->r_statelock);
1625 1625 if (rp->r_unldvp != NULL) {
1626 1626 vnode_t *unldvp;
1627 1627 char *unlname;
1628 1628 cred_t *unlcred;
1629 1629 struct nfsdiropargs da;
1630 1630 enum nfsstat status;
1631 1631 int douprintf;
1632 1632 int error;
1633 1633
1634 1634 unldvp = rp->r_unldvp;
1635 1635 rp->r_unldvp = NULL;
1636 1636 unlname = rp->r_unlname;
1637 1637 rp->r_unlname = NULL;
1638 1638 unlcred = rp->r_unlcred;
1639 1639 rp->r_unlcred = NULL;
1640 1640 mutex_exit(&rp->r_statelock);
1641 1641
1642 1642 /*
1643 1643 * If there are any dirty pages left, then flush
1644 1644 * them. This is unfortunate because they just
1645 1645 * may get thrown away during the remove operation,
1646 1646 * but we have to do this for correctness.
1647 1647 */
1648 1648 if (vn_has_cached_data(vp) &&
1649 1649 ((rp->r_flags & RDIRTY) || rp->r_count > 0)) {
1650 1650 ASSERT(vp->v_type != VCHR);
1651 1651 error = nfs_putpage(vp, (offset_t)0, 0, 0,
1652 1652 cr, ct);
1653 1653 if (error) {
1654 1654 mutex_enter(&rp->r_statelock);
1655 1655 if (!rp->r_error)
1656 1656 rp->r_error = error;
1657 1657 mutex_exit(&rp->r_statelock);
1658 1658 }
1659 1659 }
1660 1660
1661 1661 /*
1662 1662 * Do the remove operation on the renamed file
1663 1663 */
1664 1664 setdiropargs(&da, unlname, unldvp);
1665 1665
1666 1666 douprintf = 1;
1667 1667
1668 1668 (void) rfs2call(VTOMI(unldvp), RFS_REMOVE,
1669 1669 xdr_diropargs, (caddr_t)&da,
1670 1670 xdr_enum, (caddr_t)&status, unlcred,
1671 1671 &douprintf, &status, 0, NULL);
1672 1672
1673 1673 if (HAVE_RDDIR_CACHE(VTOR(unldvp)))
1674 1674 nfs_purge_rddir_cache(unldvp);
1675 1675 PURGE_ATTRCACHE(unldvp);
1676 1676
1677 1677 /*
1678 1678 * Release stuff held for the remove
1679 1679 */
1680 1680 VN_RELE(unldvp);
1681 1681 kmem_free(unlname, MAXNAMELEN);
1682 1682 crfree(unlcred);
1683 1683 goto redo;
1684 1684 }
1685 1685 mutex_exit(&rp->r_statelock);
1686 1686 }
1687 1687
1688 1688 rp_addfree(rp, cr);
1689 1689 }
1690 1690
1691 1691 /*
1692 1692 * Remote file system operations having to do with directory manipulation.
1693 1693 */
1694 1694
1695 1695 /* ARGSUSED */
1696 1696 static int
1697 1697 nfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
1698 1698 int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
1699 1699 int *direntflags, pathname_t *realpnp)
1700 1700 {
1701 1701 int error;
1702 1702 vnode_t *vp;
1703 1703 vnode_t *avp = NULL;
1704 1704 rnode_t *drp;
1705 1705
1706 1706 if (nfs_zone() != VTOMI(dvp)->mi_zone)
1707 1707 return (EPERM);
1708 1708
1709 1709 drp = VTOR(dvp);
1710 1710
1711 1711 /*
1712 1712 * Are we looking up extended attributes? If so, "dvp" is
1713 1713 * the file or directory for which we want attributes, and
1714 1714 * we need a lookup of the hidden attribute directory
1715 1715 * before we lookup the rest of the path.
1716 1716 */
1717 1717 if (flags & LOOKUP_XATTR) {
1718 1718 bool_t cflag = ((flags & CREATE_XATTR_DIR) != 0);
1719 1719 mntinfo_t *mi;
1720 1720
1721 1721 mi = VTOMI(dvp);
1722 1722 if (!(mi->mi_flags & MI_EXTATTR))
1723 1723 return (EINVAL);
1724 1724
1725 1725 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_READER, INTR(dvp)))
1726 1726 return (EINTR);
1727 1727
1728 1728 (void) nfslookup_dnlc(dvp, XATTR_DIR_NAME, &avp, cr);
1729 1729 if (avp == NULL)
1730 1730 error = acl_getxattrdir2(dvp, &avp, cflag, cr, 0);
1731 1731 else
1732 1732 error = 0;
1733 1733
1734 1734 nfs_rw_exit(&drp->r_rwlock);
1735 1735
1736 1736 if (error) {
1737 1737 if (mi->mi_flags & MI_EXTATTR)
1738 1738 return (error);
1739 1739 return (EINVAL);
1740 1740 }
1741 1741 dvp = avp;
1742 1742 drp = VTOR(dvp);
1743 1743 }
1744 1744
1745 1745 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_READER, INTR(dvp))) {
1746 1746 error = EINTR;
1747 1747 goto out;
1748 1748 }
1749 1749
1750 1750 error = nfslookup(dvp, nm, vpp, pnp, flags, rdir, cr, 0);
1751 1751
1752 1752 nfs_rw_exit(&drp->r_rwlock);
1753 1753
1754 1754 /*
1755 1755 * If vnode is a device, create special vnode.
1756 1756 */
1757 1757 if (!error && IS_DEVVP(*vpp)) {
1758 1758 vp = *vpp;
1759 1759 *vpp = specvp(vp, vp->v_rdev, vp->v_type, cr);
1760 1760 VN_RELE(vp);
1761 1761 }
1762 1762
1763 1763 out:
1764 1764 if (avp != NULL)
1765 1765 VN_RELE(avp);
1766 1766
1767 1767 return (error);
1768 1768 }
1769 1769
1770 1770 static int nfs_lookup_neg_cache = 1;
1771 1771
1772 1772 #ifdef DEBUG
1773 1773 static int nfs_lookup_dnlc_hits = 0;
1774 1774 static int nfs_lookup_dnlc_misses = 0;
1775 1775 static int nfs_lookup_dnlc_neg_hits = 0;
1776 1776 static int nfs_lookup_dnlc_disappears = 0;
1777 1777 static int nfs_lookup_dnlc_lookups = 0;
1778 1778 #endif
1779 1779
1780 1780 /* ARGSUSED */
1781 1781 int
1782 1782 nfslookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
1783 1783 int flags, vnode_t *rdir, cred_t *cr, int rfscall_flags)
1784 1784 {
1785 1785 int error;
1786 1786
1787 1787 ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone);
1788 1788
1789 1789 /*
1790 1790 * If lookup is for "", just return dvp. Don't need
1791 1791 * to send it over the wire, look it up in the dnlc,
1792 1792 * or perform any access checks.
1793 1793 */
1794 1794 if (*nm == '\0') {
1795 1795 VN_HOLD(dvp);
1796 1796 *vpp = dvp;
1797 1797 return (0);
1798 1798 }
1799 1799
1800 1800 /*
1801 1801 * Can't do lookups in non-directories.
1802 1802 */
1803 1803 if (dvp->v_type != VDIR)
1804 1804 return (ENOTDIR);
1805 1805
1806 1806 /*
1807 1807 * If we're called with RFSCALL_SOFT, it's important that
1808 1808 * the only rfscall is one we make directly; if we permit
1809 1809 * an access call because we're looking up "." or validating
1810 1810 * a dnlc hit, we'll deadlock because that rfscall will not
1811 1811 * have the RFSCALL_SOFT set.
1812 1812 */
1813 1813 if (rfscall_flags & RFSCALL_SOFT)
1814 1814 goto callit;
1815 1815
1816 1816 /*
1817 1817 * If lookup is for ".", just return dvp. Don't need
1818 1818 * to send it over the wire or look it up in the dnlc,
1819 1819 * just need to check access.
1820 1820 */
1821 1821 if (strcmp(nm, ".") == 0) {
1822 1822 error = nfs_access(dvp, VEXEC, 0, cr, NULL);
1823 1823 if (error)
1824 1824 return (error);
1825 1825 VN_HOLD(dvp);
1826 1826 *vpp = dvp;
1827 1827 return (0);
1828 1828 }
1829 1829
1830 1830 /*
1831 1831 * Lookup this name in the DNLC. If there was a valid entry,
1832 1832 * then return the results of the lookup.
1833 1833 */
1834 1834 error = nfslookup_dnlc(dvp, nm, vpp, cr);
1835 1835 if (error || *vpp != NULL)
1836 1836 return (error);
1837 1837
1838 1838 callit:
1839 1839 error = nfslookup_otw(dvp, nm, vpp, cr, rfscall_flags);
1840 1840
1841 1841 return (error);
1842 1842 }
1843 1843
1844 1844 static int
1845 1845 nfslookup_dnlc(vnode_t *dvp, char *nm, vnode_t **vpp, cred_t *cr)
1846 1846 {
1847 1847 int error;
1848 1848 vnode_t *vp;
1849 1849
1850 1850 ASSERT(*nm != '\0');
1851 1851 ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone);
1852 1852
1853 1853 /*
1854 1854 * Lookup this name in the DNLC. If successful, then validate
1855 1855 * the caches and then recheck the DNLC. The DNLC is rechecked
1856 1856 * just in case this entry got invalidated during the call
1857 1857 * to nfs_validate_caches.
1858 1858 *
1859 1859 * An assumption is being made that it is safe to say that a
1860 1860 * file exists which may not on the server. Any operations to
1861 1861 * the server will fail with ESTALE.
1862 1862 */
1863 1863 #ifdef DEBUG
1864 1864 nfs_lookup_dnlc_lookups++;
1865 1865 #endif
1866 1866 vp = dnlc_lookup(dvp, nm);
1867 1867 if (vp != NULL) {
1868 1868 VN_RELE(vp);
1869 1869 if (vp == DNLC_NO_VNODE && !vn_is_readonly(dvp)) {
1870 1870 PURGE_ATTRCACHE(dvp);
1871 1871 }
1872 1872 error = nfs_validate_caches(dvp, cr);
1873 1873 if (error)
1874 1874 return (error);
1875 1875 vp = dnlc_lookup(dvp, nm);
1876 1876 if (vp != NULL) {
1877 1877 error = nfs_access(dvp, VEXEC, 0, cr, NULL);
1878 1878 if (error) {
1879 1879 VN_RELE(vp);
1880 1880 return (error);
1881 1881 }
1882 1882 if (vp == DNLC_NO_VNODE) {
1883 1883 VN_RELE(vp);
1884 1884 #ifdef DEBUG
1885 1885 nfs_lookup_dnlc_neg_hits++;
1886 1886 #endif
1887 1887 return (ENOENT);
1888 1888 }
1889 1889 *vpp = vp;
1890 1890 #ifdef DEBUG
1891 1891 nfs_lookup_dnlc_hits++;
1892 1892 #endif
1893 1893 return (0);
1894 1894 }
1895 1895 #ifdef DEBUG
1896 1896 nfs_lookup_dnlc_disappears++;
1897 1897 #endif
1898 1898 }
1899 1899 #ifdef DEBUG
1900 1900 else
1901 1901 nfs_lookup_dnlc_misses++;
1902 1902 #endif
1903 1903
1904 1904 *vpp = NULL;
1905 1905
1906 1906 return (0);
1907 1907 }
1908 1908
1909 1909 static int
1910 1910 nfslookup_otw(vnode_t *dvp, char *nm, vnode_t **vpp, cred_t *cr,
1911 1911 int rfscall_flags)
1912 1912 {
1913 1913 int error;
1914 1914 struct nfsdiropargs da;
1915 1915 struct nfsdiropres dr;
1916 1916 int douprintf;
1917 1917 failinfo_t fi;
1918 1918 hrtime_t t;
1919 1919
1920 1920 ASSERT(*nm != '\0');
1921 1921 ASSERT(dvp->v_type == VDIR);
1922 1922 ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone);
1923 1923
1924 1924 setdiropargs(&da, nm, dvp);
1925 1925
1926 1926 fi.vp = dvp;
1927 1927 fi.fhp = NULL; /* no need to update, filehandle not copied */
1928 1928 fi.copyproc = nfscopyfh;
1929 1929 fi.lookupproc = nfslookup;
1930 1930 fi.xattrdirproc = acl_getxattrdir2;
1931 1931
1932 1932 douprintf = 1;
1933 1933
1934 1934 t = gethrtime();
1935 1935
1936 1936 error = rfs2call(VTOMI(dvp), RFS_LOOKUP,
1937 1937 xdr_diropargs, (caddr_t)&da,
1938 1938 xdr_diropres, (caddr_t)&dr, cr,
1939 1939 &douprintf, &dr.dr_status, rfscall_flags, &fi);
1940 1940
1941 1941 if (!error) {
1942 1942 error = geterrno(dr.dr_status);
1943 1943 if (!error) {
1944 1944 *vpp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr,
1945 1945 dvp->v_vfsp, t, cr, VTOR(dvp)->r_path, nm);
1946 1946 /*
1947 1947 * If NFS_ACL is supported on the server, then the
1948 1948 * attributes returned by server may have minimal
1949 1949 * permissions sometimes denying access to users having
1950 1950 * proper access. To get the proper attributes, mark
1951 1951 * the attributes as expired so that they will be
1952 1952 * regotten via the NFS_ACL GETATTR2 procedure.
1953 1953 */
1954 1954 if (VTOMI(*vpp)->mi_flags & MI_ACL) {
1955 1955 PURGE_ATTRCACHE(*vpp);
1956 1956 }
1957 1957 if (!(rfscall_flags & RFSCALL_SOFT))
1958 1958 dnlc_update(dvp, nm, *vpp);
1959 1959 } else {
1960 1960 PURGE_STALE_FH(error, dvp, cr);
1961 1961 if (error == ENOENT && nfs_lookup_neg_cache)
1962 1962 dnlc_enter(dvp, nm, DNLC_NO_VNODE);
1963 1963 }
1964 1964 }
1965 1965
1966 1966 return (error);
1967 1967 }
1968 1968
1969 1969 /* ARGSUSED */
1970 1970 static int
1971 1971 nfs_create(vnode_t *dvp, char *nm, struct vattr *va, enum vcexcl exclusive,
1972 1972 int mode, vnode_t **vpp, cred_t *cr, int lfaware, caller_context_t *ct,
1973 1973 vsecattr_t *vsecp)
1974 1974 {
1975 1975 int error;
1976 1976 struct nfscreatargs args;
1977 1977 struct nfsdiropres dr;
1978 1978 int douprintf;
1979 1979 vnode_t *vp;
1980 1980 rnode_t *rp;
1981 1981 struct vattr vattr;
1982 1982 rnode_t *drp;
1983 1983 vnode_t *tempvp;
1984 1984 hrtime_t t;
1985 1985
1986 1986 drp = VTOR(dvp);
1987 1987
1988 1988 if (nfs_zone() != VTOMI(dvp)->mi_zone)
1989 1989 return (EPERM);
1990 1990 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp)))
1991 1991 return (EINTR);
1992 1992
1993 1993 /*
1994 1994 * We make a copy of the attributes because the caller does not
1995 1995 * expect us to change what va points to.
1996 1996 */
1997 1997 vattr = *va;
1998 1998
1999 1999 /*
2000 2000 * If the pathname is "", just use dvp. Don't need
2001 2001 * to send it over the wire, look it up in the dnlc,
2002 2002 * or perform any access checks.
2003 2003 */
2004 2004 if (*nm == '\0') {
2005 2005 error = 0;
2006 2006 VN_HOLD(dvp);
2007 2007 vp = dvp;
2008 2008 /*
2009 2009 * If the pathname is ".", just use dvp. Don't need
2010 2010 * to send it over the wire or look it up in the dnlc,
2011 2011 * just need to check access.
2012 2012 */
2013 2013 } else if (strcmp(nm, ".") == 0) {
2014 2014 error = nfs_access(dvp, VEXEC, 0, cr, ct);
2015 2015 if (error) {
2016 2016 nfs_rw_exit(&drp->r_rwlock);
2017 2017 return (error);
2018 2018 }
2019 2019 VN_HOLD(dvp);
2020 2020 vp = dvp;
2021 2021 /*
2022 2022 * We need to go over the wire, just to be sure whether the
2023 2023 * file exists or not. Using the DNLC can be dangerous in
2024 2024 * this case when making a decision regarding existence.
2025 2025 */
2026 2026 } else {
2027 2027 error = nfslookup_otw(dvp, nm, &vp, cr, 0);
2028 2028 }
2029 2029 if (!error) {
2030 2030 if (exclusive == EXCL)
2031 2031 error = EEXIST;
2032 2032 else if (vp->v_type == VDIR && (mode & VWRITE))
2033 2033 error = EISDIR;
2034 2034 else {
2035 2035 /*
2036 2036 * If vnode is a device, create special vnode.
2037 2037 */
2038 2038 if (IS_DEVVP(vp)) {
2039 2039 tempvp = vp;
2040 2040 vp = specvp(vp, vp->v_rdev, vp->v_type, cr);
2041 2041 VN_RELE(tempvp);
2042 2042 }
2043 2043 if (!(error = VOP_ACCESS(vp, mode, 0, cr, ct))) {
2044 2044 if ((vattr.va_mask & AT_SIZE) &&
2045 2045 vp->v_type == VREG) {
2046 2046 vattr.va_mask = AT_SIZE;
2047 2047 error = nfssetattr(vp, &vattr, 0, cr);
2048 2048
2049 2049 if (!error) {
2050 2050 /*
2051 2051 * Existing file was truncated;
2052 2052 * emit a create event.
2053 2053 */
2054 2054 vnevent_create(vp, ct);
2055 2055 }
2056 2056 }
2057 2057 }
2058 2058 }
2059 2059 nfs_rw_exit(&drp->r_rwlock);
2060 2060 if (error) {
2061 2061 VN_RELE(vp);
2062 2062 } else {
2063 2063 *vpp = vp;
2064 2064 }
2065 2065 return (error);
2066 2066 }
2067 2067
2068 2068 ASSERT(vattr.va_mask & AT_TYPE);
2069 2069 if (vattr.va_type == VREG) {
2070 2070 ASSERT(vattr.va_mask & AT_MODE);
2071 2071 if (MANDMODE(vattr.va_mode)) {
2072 2072 nfs_rw_exit(&drp->r_rwlock);
2073 2073 return (EACCES);
2074 2074 }
2075 2075 }
2076 2076
2077 2077 dnlc_remove(dvp, nm);
2078 2078
2079 2079 setdiropargs(&args.ca_da, nm, dvp);
2080 2080
2081 2081 /*
2082 2082 * Decide what the group-id of the created file should be.
2083 2083 * Set it in attribute list as advisory...then do a setattr
2084 2084 * if the server didn't get it right the first time.
2085 2085 */
2086 2086 error = setdirgid(dvp, &vattr.va_gid, cr);
2087 2087 if (error) {
2088 2088 nfs_rw_exit(&drp->r_rwlock);
2089 2089 return (error);
2090 2090 }
2091 2091 vattr.va_mask |= AT_GID;
2092 2092
2093 2093 /*
2094 2094 * This is a completely gross hack to make mknod
2095 2095 * work over the wire until we can wack the protocol
2096 2096 */
2097 2097 #define IFCHR 0020000 /* character special */
2098 2098 #define IFBLK 0060000 /* block special */
2099 2099 #define IFSOCK 0140000 /* socket */
2100 2100
2101 2101 /*
2102 2102 * dev_t is uint_t in 5.x and short in 4.x. Both 4.x
2103 2103 * supports 8 bit majors. 5.x supports 14 bit majors. 5.x supports 18
2104 2104 * bits in the minor number where 4.x supports 8 bits. If the 5.x
2105 2105 * minor/major numbers <= 8 bits long, compress the device
2106 2106 * number before sending it. Otherwise, the 4.x server will not
2107 2107 * create the device with the correct device number and nothing can be
2108 2108 * done about this.
2109 2109 */
2110 2110 if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
2111 2111 dev_t d = vattr.va_rdev;
2112 2112 dev32_t dev32;
2113 2113
2114 2114 if (vattr.va_type == VCHR)
2115 2115 vattr.va_mode |= IFCHR;
2116 2116 else
2117 2117 vattr.va_mode |= IFBLK;
2118 2118
2119 2119 (void) cmpldev(&dev32, d);
2120 2120 if (dev32 & ~((SO4_MAXMAJ << L_BITSMINOR32) | SO4_MAXMIN))
2121 2121 vattr.va_size = (u_offset_t)dev32;
2122 2122 else
2123 2123 vattr.va_size = (u_offset_t)nfsv2_cmpdev(d);
2124 2124
2125 2125 vattr.va_mask |= AT_MODE|AT_SIZE;
2126 2126 } else if (vattr.va_type == VFIFO) {
2127 2127 vattr.va_mode |= IFCHR; /* xtra kludge for namedpipe */
2128 2128 vattr.va_size = (u_offset_t)NFS_FIFO_DEV; /* blech */
2129 2129 vattr.va_mask |= AT_MODE|AT_SIZE;
2130 2130 } else if (vattr.va_type == VSOCK) {
2131 2131 vattr.va_mode |= IFSOCK;
2132 2132 /*
2133 2133 * To avoid triggering bugs in the servers set AT_SIZE
2134 2134 * (all other RFS_CREATE calls set this).
2135 2135 */
2136 2136 vattr.va_size = 0;
2137 2137 vattr.va_mask |= AT_MODE|AT_SIZE;
2138 2138 }
2139 2139
2140 2140 args.ca_sa = &args.ca_sa_buf;
2141 2141 error = vattr_to_sattr(&vattr, args.ca_sa);
2142 2142 if (error) {
2143 2143 /* req time field(s) overflow - return immediately */
2144 2144 nfs_rw_exit(&drp->r_rwlock);
2145 2145 return (error);
2146 2146 }
2147 2147
2148 2148 douprintf = 1;
2149 2149
2150 2150 t = gethrtime();
2151 2151
2152 2152 error = rfs2call(VTOMI(dvp), RFS_CREATE,
2153 2153 xdr_creatargs, (caddr_t)&args,
2154 2154 xdr_diropres, (caddr_t)&dr, cr,
2155 2155 &douprintf, &dr.dr_status, 0, NULL);
2156 2156
2157 2157 PURGE_ATTRCACHE(dvp); /* mod time changed */
2158 2158
2159 2159 if (!error) {
2160 2160 error = geterrno(dr.dr_status);
2161 2161 if (!error) {
2162 2162 if (HAVE_RDDIR_CACHE(drp))
2163 2163 nfs_purge_rddir_cache(dvp);
2164 2164 vp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr,
2165 2165 dvp->v_vfsp, t, cr, NULL, NULL);
2166 2166 /*
2167 2167 * If NFS_ACL is supported on the server, then the
2168 2168 * attributes returned by server may have minimal
2169 2169 * permissions sometimes denying access to users having
2170 2170 * proper access. To get the proper attributes, mark
2171 2171 * the attributes as expired so that they will be
2172 2172 * regotten via the NFS_ACL GETATTR2 procedure.
2173 2173 */
2174 2174 if (VTOMI(vp)->mi_flags & MI_ACL) {
2175 2175 PURGE_ATTRCACHE(vp);
2176 2176 }
2177 2177 dnlc_update(dvp, nm, vp);
2178 2178 rp = VTOR(vp);
2179 2179 if (vattr.va_size == 0) {
2180 2180 mutex_enter(&rp->r_statelock);
2181 2181 rp->r_size = 0;
2182 2182 mutex_exit(&rp->r_statelock);
2183 2183 if (vn_has_cached_data(vp)) {
2184 2184 ASSERT(vp->v_type != VCHR);
2185 2185 nfs_invalidate_pages(vp,
2186 2186 (u_offset_t)0, cr);
2187 2187 }
2188 2188 }
2189 2189
2190 2190 /*
2191 2191 * Make sure the gid was set correctly.
2192 2192 * If not, try to set it (but don't lose
2193 2193 * any sleep over it).
2194 2194 */
2195 2195 if (vattr.va_gid != rp->r_attr.va_gid) {
2196 2196 vattr.va_mask = AT_GID;
2197 2197 (void) nfssetattr(vp, &vattr, 0, cr);
2198 2198 }
2199 2199
2200 2200 /*
2201 2201 * If vnode is a device create special vnode
2202 2202 */
2203 2203 if (IS_DEVVP(vp)) {
2204 2204 *vpp = specvp(vp, vp->v_rdev, vp->v_type, cr);
2205 2205 VN_RELE(vp);
2206 2206 } else
2207 2207 *vpp = vp;
2208 2208 } else {
2209 2209 PURGE_STALE_FH(error, dvp, cr);
2210 2210 }
2211 2211 }
2212 2212
2213 2213 nfs_rw_exit(&drp->r_rwlock);
2214 2214
2215 2215 return (error);
2216 2216 }
2217 2217
2218 2218 /*
2219 2219 * Weirdness: if the vnode to be removed is open
2220 2220 * we rename it instead of removing it and nfs_inactive
2221 2221 * will remove the new name.
2222 2222 */
2223 2223 /* ARGSUSED */
2224 2224 static int
2225 2225 nfs_remove(vnode_t *dvp, char *nm, cred_t *cr, caller_context_t *ct, int flags)
2226 2226 {
2227 2227 int error;
2228 2228 struct nfsdiropargs da;
2229 2229 enum nfsstat status;
2230 2230 vnode_t *vp;
2231 2231 char *tmpname;
2232 2232 int douprintf;
2233 2233 rnode_t *rp;
2234 2234 rnode_t *drp;
2235 2235
2236 2236 if (nfs_zone() != VTOMI(dvp)->mi_zone)
2237 2237 return (EPERM);
2238 2238 drp = VTOR(dvp);
2239 2239 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp)))
2240 2240 return (EINTR);
2241 2241
2242 2242 error = nfslookup(dvp, nm, &vp, NULL, 0, NULL, cr, 0);
2243 2243 if (error) {
2244 2244 nfs_rw_exit(&drp->r_rwlock);
2245 2245 return (error);
2246 2246 }
2247 2247
2248 2248 if (vp->v_type == VDIR && secpolicy_fs_linkdir(cr, dvp->v_vfsp)) {
2249 2249 VN_RELE(vp);
2250 2250 nfs_rw_exit(&drp->r_rwlock);
2251 2251 return (EPERM);
2252 2252 }
2253 2253
2254 2254 /*
2255 2255 * First just remove the entry from the name cache, as it
2256 2256 * is most likely the only entry for this vp.
2257 2257 */
2258 2258 dnlc_remove(dvp, nm);
2259 2259
2260 2260 /*
2261 2261 * If the file has a v_count > 1 then there may be more than one
2262 2262 * entry in the name cache due multiple links or an open file,
2263 2263 * but we don't have the real reference count so flush all
2264 2264 * possible entries.
2265 2265 */
2266 2266 if (vp->v_count > 1)
2267 2267 dnlc_purge_vp(vp);
2268 2268
2269 2269 /*
2270 2270 * Now we have the real reference count on the vnode
2271 2271 */
2272 2272 rp = VTOR(vp);
2273 2273 mutex_enter(&rp->r_statelock);
2274 2274 if (vp->v_count > 1 &&
2275 2275 (rp->r_unldvp == NULL || strcmp(nm, rp->r_unlname) == 0)) {
2276 2276 mutex_exit(&rp->r_statelock);
2277 2277 tmpname = newname();
2278 2278 error = nfsrename(dvp, nm, dvp, tmpname, cr, ct);
2279 2279 if (error)
2280 2280 kmem_free(tmpname, MAXNAMELEN);
2281 2281 else {
2282 2282 mutex_enter(&rp->r_statelock);
2283 2283 if (rp->r_unldvp == NULL) {
2284 2284 VN_HOLD(dvp);
2285 2285 rp->r_unldvp = dvp;
2286 2286 if (rp->r_unlcred != NULL)
2287 2287 crfree(rp->r_unlcred);
2288 2288 crhold(cr);
2289 2289 rp->r_unlcred = cr;
2290 2290 rp->r_unlname = tmpname;
2291 2291 } else {
2292 2292 kmem_free(rp->r_unlname, MAXNAMELEN);
2293 2293 rp->r_unlname = tmpname;
2294 2294 }
2295 2295 mutex_exit(&rp->r_statelock);
2296 2296 }
2297 2297 } else {
2298 2298 mutex_exit(&rp->r_statelock);
2299 2299 /*
2300 2300 * We need to flush any dirty pages which happen to
2301 2301 * be hanging around before removing the file. This
2302 2302 * shouldn't happen very often and mostly on file
2303 2303 * systems mounted "nocto".
2304 2304 */
2305 2305 if (vn_has_cached_data(vp) &&
2306 2306 ((rp->r_flags & RDIRTY) || rp->r_count > 0)) {
2307 2307 error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct);
2308 2308 if (error && (error == ENOSPC || error == EDQUOT)) {
2309 2309 mutex_enter(&rp->r_statelock);
2310 2310 if (!rp->r_error)
2311 2311 rp->r_error = error;
2312 2312 mutex_exit(&rp->r_statelock);
2313 2313 }
2314 2314 }
2315 2315
2316 2316 setdiropargs(&da, nm, dvp);
2317 2317
2318 2318 douprintf = 1;
2319 2319
2320 2320 error = rfs2call(VTOMI(dvp), RFS_REMOVE,
2321 2321 xdr_diropargs, (caddr_t)&da,
2322 2322 xdr_enum, (caddr_t)&status, cr,
2323 2323 &douprintf, &status, 0, NULL);
2324 2324
2325 2325 /*
2326 2326 * The xattr dir may be gone after last attr is removed,
2327 2327 * so flush it from dnlc.
2328 2328 */
2329 2329 if (dvp->v_flag & V_XATTRDIR)
2330 2330 dnlc_purge_vp(dvp);
2331 2331
2332 2332 PURGE_ATTRCACHE(dvp); /* mod time changed */
2333 2333 PURGE_ATTRCACHE(vp); /* link count changed */
2334 2334
2335 2335 if (!error) {
2336 2336 error = geterrno(status);
2337 2337 if (!error) {
2338 2338 if (HAVE_RDDIR_CACHE(drp))
2339 2339 nfs_purge_rddir_cache(dvp);
2340 2340 } else {
2341 2341 PURGE_STALE_FH(error, dvp, cr);
2342 2342 }
2343 2343 }
2344 2344 }
2345 2345
2346 2346 if (error == 0) {
2347 2347 vnevent_remove(vp, dvp, nm, ct);
2348 2348 }
2349 2349 VN_RELE(vp);
2350 2350
2351 2351 nfs_rw_exit(&drp->r_rwlock);
2352 2352
2353 2353 return (error);
2354 2354 }
2355 2355
2356 2356 /* ARGSUSED */
2357 2357 static int
2358 2358 nfs_link(vnode_t *tdvp, vnode_t *svp, char *tnm, cred_t *cr,
2359 2359 caller_context_t *ct, int flags)
2360 2360 {
2361 2361 int error;
2362 2362 struct nfslinkargs args;
2363 2363 enum nfsstat status;
2364 2364 vnode_t *realvp;
2365 2365 int douprintf;
2366 2366 rnode_t *tdrp;
2367 2367
2368 2368 if (nfs_zone() != VTOMI(tdvp)->mi_zone)
2369 2369 return (EPERM);
2370 2370 if (VOP_REALVP(svp, &realvp, ct) == 0)
2371 2371 svp = realvp;
2372 2372
2373 2373 args.la_from = VTOFH(svp);
2374 2374 setdiropargs(&args.la_to, tnm, tdvp);
2375 2375
2376 2376 tdrp = VTOR(tdvp);
2377 2377 if (nfs_rw_enter_sig(&tdrp->r_rwlock, RW_WRITER, INTR(tdvp)))
2378 2378 return (EINTR);
2379 2379
2380 2380 dnlc_remove(tdvp, tnm);
2381 2381
2382 2382 douprintf = 1;
2383 2383
2384 2384 error = rfs2call(VTOMI(svp), RFS_LINK,
2385 2385 xdr_linkargs, (caddr_t)&args,
2386 2386 xdr_enum, (caddr_t)&status, cr,
2387 2387 &douprintf, &status, 0, NULL);
2388 2388
2389 2389 PURGE_ATTRCACHE(tdvp); /* mod time changed */
2390 2390 PURGE_ATTRCACHE(svp); /* link count changed */
2391 2391
2392 2392 if (!error) {
2393 2393 error = geterrno(status);
2394 2394 if (!error) {
2395 2395 if (HAVE_RDDIR_CACHE(tdrp))
2396 2396 nfs_purge_rddir_cache(tdvp);
2397 2397 }
2398 2398 }
2399 2399
2400 2400 nfs_rw_exit(&tdrp->r_rwlock);
2401 2401
2402 2402 if (!error) {
2403 2403 /*
2404 2404 * Notify the source file of this link operation.
2405 2405 */
2406 2406 vnevent_link(svp, ct);
2407 2407 }
2408 2408 return (error);
2409 2409 }
2410 2410
2411 2411 /* ARGSUSED */
2412 2412 static int
2413 2413 nfs_rename(vnode_t *odvp, char *onm, vnode_t *ndvp, char *nnm, cred_t *cr,
2414 2414 caller_context_t *ct, int flags)
2415 2415 {
2416 2416 vnode_t *realvp;
2417 2417
2418 2418 if (nfs_zone() != VTOMI(odvp)->mi_zone)
2419 2419 return (EPERM);
2420 2420 if (VOP_REALVP(ndvp, &realvp, ct) == 0)
2421 2421 ndvp = realvp;
2422 2422
2423 2423 return (nfsrename(odvp, onm, ndvp, nnm, cr, ct));
2424 2424 }
2425 2425
2426 2426 /*
2427 2427 * nfsrename does the real work of renaming in NFS Version 2.
2428 2428 */
2429 2429 static int
2430 2430 nfsrename(vnode_t *odvp, char *onm, vnode_t *ndvp, char *nnm, cred_t *cr,
2431 2431 caller_context_t *ct)
2432 2432 {
2433 2433 int error;
2434 2434 enum nfsstat status;
2435 2435 struct nfsrnmargs args;
2436 2436 int douprintf;
2437 2437 vnode_t *nvp = NULL;
2438 2438 vnode_t *ovp = NULL;
2439 2439 char *tmpname;
2440 2440 rnode_t *rp;
2441 2441 rnode_t *odrp;
2442 2442 rnode_t *ndrp;
2443 2443
2444 2444 ASSERT(nfs_zone() == VTOMI(odvp)->mi_zone);
2445 2445 if (strcmp(onm, ".") == 0 || strcmp(onm, "..") == 0 ||
2446 2446 strcmp(nnm, ".") == 0 || strcmp(nnm, "..") == 0)
2447 2447 return (EINVAL);
2448 2448
2449 2449 odrp = VTOR(odvp);
2450 2450 ndrp = VTOR(ndvp);
2451 2451 if ((intptr_t)odrp < (intptr_t)ndrp) {
2452 2452 if (nfs_rw_enter_sig(&odrp->r_rwlock, RW_WRITER, INTR(odvp)))
2453 2453 return (EINTR);
2454 2454 if (nfs_rw_enter_sig(&ndrp->r_rwlock, RW_WRITER, INTR(ndvp))) {
2455 2455 nfs_rw_exit(&odrp->r_rwlock);
2456 2456 return (EINTR);
2457 2457 }
2458 2458 } else {
2459 2459 if (nfs_rw_enter_sig(&ndrp->r_rwlock, RW_WRITER, INTR(ndvp)))
2460 2460 return (EINTR);
2461 2461 if (nfs_rw_enter_sig(&odrp->r_rwlock, RW_WRITER, INTR(odvp))) {
2462 2462 nfs_rw_exit(&ndrp->r_rwlock);
2463 2463 return (EINTR);
2464 2464 }
2465 2465 }
2466 2466
2467 2467 /*
2468 2468 * Lookup the target file. If it exists, it needs to be
2469 2469 * checked to see whether it is a mount point and whether
2470 2470 * it is active (open).
2471 2471 */
2472 2472 error = nfslookup(ndvp, nnm, &nvp, NULL, 0, NULL, cr, 0);
2473 2473 if (!error) {
2474 2474 /*
2475 2475 * If this file has been mounted on, then just
2476 2476 * return busy because renaming to it would remove
2477 2477 * the mounted file system from the name space.
2478 2478 */
2479 2479 if (vn_mountedvfs(nvp) != NULL) {
2480 2480 VN_RELE(nvp);
2481 2481 nfs_rw_exit(&odrp->r_rwlock);
2482 2482 nfs_rw_exit(&ndrp->r_rwlock);
2483 2483 return (EBUSY);
2484 2484 }
2485 2485
2486 2486 /*
2487 2487 * Purge the name cache of all references to this vnode
2488 2488 * so that we can check the reference count to infer
2489 2489 * whether it is active or not.
2490 2490 */
2491 2491 /*
2492 2492 * First just remove the entry from the name cache, as it
2493 2493 * is most likely the only entry for this vp.
2494 2494 */
2495 2495 dnlc_remove(ndvp, nnm);
2496 2496 /*
2497 2497 * If the file has a v_count > 1 then there may be more
2498 2498 * than one entry in the name cache due multiple links
2499 2499 * or an open file, but we don't have the real reference
2500 2500 * count so flush all possible entries.
2501 2501 */
2502 2502 if (nvp->v_count > 1)
2503 2503 dnlc_purge_vp(nvp);
2504 2504
2505 2505 /*
2506 2506 * If the vnode is active and is not a directory,
2507 2507 * arrange to rename it to a
2508 2508 * temporary file so that it will continue to be
2509 2509 * accessible. This implements the "unlink-open-file"
2510 2510 * semantics for the target of a rename operation.
2511 2511 * Before doing this though, make sure that the
2512 2512 * source and target files are not already the same.
2513 2513 */
2514 2514 if (nvp->v_count > 1 && nvp->v_type != VDIR) {
2515 2515 /*
2516 2516 * Lookup the source name.
2517 2517 */
2518 2518 error = nfslookup(odvp, onm, &ovp, NULL, 0, NULL,
2519 2519 cr, 0);
2520 2520
2521 2521 /*
2522 2522 * The source name *should* already exist.
2523 2523 */
2524 2524 if (error) {
2525 2525 VN_RELE(nvp);
2526 2526 nfs_rw_exit(&odrp->r_rwlock);
2527 2527 nfs_rw_exit(&ndrp->r_rwlock);
2528 2528 return (error);
2529 2529 }
2530 2530
2531 2531 /*
2532 2532 * Compare the two vnodes. If they are the same,
2533 2533 * just release all held vnodes and return success.
2534 2534 */
2535 2535 if (ovp == nvp) {
2536 2536 VN_RELE(ovp);
2537 2537 VN_RELE(nvp);
2538 2538 nfs_rw_exit(&odrp->r_rwlock);
2539 2539 nfs_rw_exit(&ndrp->r_rwlock);
2540 2540 return (0);
2541 2541 }
2542 2542
2543 2543 /*
2544 2544 * Can't mix and match directories and non-
2545 2545 * directories in rename operations. We already
2546 2546 * know that the target is not a directory. If
2547 2547 * the source is a directory, return an error.
2548 2548 */
2549 2549 if (ovp->v_type == VDIR) {
2550 2550 VN_RELE(ovp);
2551 2551 VN_RELE(nvp);
2552 2552 nfs_rw_exit(&odrp->r_rwlock);
2553 2553 nfs_rw_exit(&ndrp->r_rwlock);
2554 2554 return (ENOTDIR);
2555 2555 }
2556 2556
2557 2557 /*
2558 2558 * The target file exists, is not the same as
2559 2559 * the source file, and is active. Link it
2560 2560 * to a temporary filename to avoid having
2561 2561 * the server removing the file completely.
2562 2562 */
2563 2563 tmpname = newname();
2564 2564 error = nfs_link(ndvp, nvp, tmpname, cr, NULL, 0);
2565 2565 if (error == EOPNOTSUPP) {
2566 2566 error = nfs_rename(ndvp, nnm, ndvp, tmpname,
2567 2567 cr, NULL, 0);
2568 2568 }
2569 2569 if (error) {
2570 2570 kmem_free(tmpname, MAXNAMELEN);
2571 2571 VN_RELE(ovp);
2572 2572 VN_RELE(nvp);
2573 2573 nfs_rw_exit(&odrp->r_rwlock);
2574 2574 nfs_rw_exit(&ndrp->r_rwlock);
2575 2575 return (error);
2576 2576 }
2577 2577 rp = VTOR(nvp);
2578 2578 mutex_enter(&rp->r_statelock);
2579 2579 if (rp->r_unldvp == NULL) {
2580 2580 VN_HOLD(ndvp);
2581 2581 rp->r_unldvp = ndvp;
2582 2582 if (rp->r_unlcred != NULL)
2583 2583 crfree(rp->r_unlcred);
2584 2584 crhold(cr);
2585 2585 rp->r_unlcred = cr;
2586 2586 rp->r_unlname = tmpname;
2587 2587 } else {
2588 2588 kmem_free(rp->r_unlname, MAXNAMELEN);
2589 2589 rp->r_unlname = tmpname;
2590 2590 }
2591 2591 mutex_exit(&rp->r_statelock);
2592 2592 }
2593 2593 }
2594 2594
2595 2595 if (ovp == NULL) {
2596 2596 /*
2597 2597 * When renaming directories to be a subdirectory of a
2598 2598 * different parent, the dnlc entry for ".." will no
2599 2599 * longer be valid, so it must be removed.
2600 2600 *
2601 2601 * We do a lookup here to determine whether we are renaming
2602 2602 * a directory and we need to check if we are renaming
2603 2603 * an unlinked file. This might have already been done
2604 2604 * in previous code, so we check ovp == NULL to avoid
2605 2605 * doing it twice.
2606 2606 */
2607 2607
2608 2608 error = nfslookup(odvp, onm, &ovp, NULL, 0, NULL, cr, 0);
2609 2609
2610 2610 /*
2611 2611 * The source name *should* already exist.
2612 2612 */
2613 2613 if (error) {
2614 2614 nfs_rw_exit(&odrp->r_rwlock);
2615 2615 nfs_rw_exit(&ndrp->r_rwlock);
2616 2616 if (nvp) {
2617 2617 VN_RELE(nvp);
2618 2618 }
2619 2619 return (error);
2620 2620 }
2621 2621 ASSERT(ovp != NULL);
2622 2622 }
2623 2623
2624 2624 dnlc_remove(odvp, onm);
2625 2625 dnlc_remove(ndvp, nnm);
2626 2626
2627 2627 setdiropargs(&args.rna_from, onm, odvp);
2628 2628 setdiropargs(&args.rna_to, nnm, ndvp);
2629 2629
2630 2630 douprintf = 1;
2631 2631
2632 2632 error = rfs2call(VTOMI(odvp), RFS_RENAME,
2633 2633 xdr_rnmargs, (caddr_t)&args,
2634 2634 xdr_enum, (caddr_t)&status, cr,
2635 2635 &douprintf, &status, 0, NULL);
2636 2636
2637 2637 PURGE_ATTRCACHE(odvp); /* mod time changed */
2638 2638 PURGE_ATTRCACHE(ndvp); /* mod time changed */
2639 2639
2640 2640 if (!error) {
2641 2641 error = geterrno(status);
2642 2642 if (!error) {
2643 2643 if (HAVE_RDDIR_CACHE(odrp))
2644 2644 nfs_purge_rddir_cache(odvp);
2645 2645 if (HAVE_RDDIR_CACHE(ndrp))
2646 2646 nfs_purge_rddir_cache(ndvp);
2647 2647 /*
2648 2648 * when renaming directories to be a subdirectory of a
2649 2649 * different parent, the dnlc entry for ".." will no
2650 2650 * longer be valid, so it must be removed
2651 2651 */
2652 2652 rp = VTOR(ovp);
2653 2653 if (ndvp != odvp) {
2654 2654 if (ovp->v_type == VDIR) {
2655 2655 dnlc_remove(ovp, "..");
2656 2656 if (HAVE_RDDIR_CACHE(rp))
2657 2657 nfs_purge_rddir_cache(ovp);
2658 2658 }
2659 2659 }
2660 2660
2661 2661 /*
2662 2662 * If we are renaming the unlinked file, update the
2663 2663 * r_unldvp and r_unlname as needed.
2664 2664 */
2665 2665 mutex_enter(&rp->r_statelock);
2666 2666 if (rp->r_unldvp != NULL) {
2667 2667 if (strcmp(rp->r_unlname, onm) == 0) {
2668 2668 (void) strncpy(rp->r_unlname,
2669 2669 nnm, MAXNAMELEN);
2670 2670 rp->r_unlname[MAXNAMELEN - 1] = '\0';
2671 2671
2672 2672 if (ndvp != rp->r_unldvp) {
2673 2673 VN_RELE(rp->r_unldvp);
2674 2674 rp->r_unldvp = ndvp;
2675 2675 VN_HOLD(ndvp);
2676 2676 }
2677 2677 }
2678 2678 }
2679 2679 mutex_exit(&rp->r_statelock);
2680 2680 } else {
2681 2681 /*
2682 2682 * System V defines rename to return EEXIST, not
2683 2683 * ENOTEMPTY if the target directory is not empty.
2684 2684 * Over the wire, the error is NFSERR_ENOTEMPTY
2685 2685 * which geterrno maps to ENOTEMPTY.
2686 2686 */
2687 2687 if (error == ENOTEMPTY)
2688 2688 error = EEXIST;
2689 2689 }
2690 2690 }
2691 2691
2692 2692 if (error == 0) {
2693 2693 if (nvp)
2694 2694 vnevent_rename_dest(nvp, ndvp, nnm, ct);
2695 2695
2696 2696 ASSERT(ovp != NULL);
2697 2697 vnevent_rename_src(ovp, odvp, onm, ct);
2698 2698 vnevent_rename_dest_dir(ndvp, ovp, nnm, ct);
2699 2699 }
2700 2700
2701 2701 if (nvp) {
2702 2702 VN_RELE(nvp);
2703 2703 }
2704 2704 VN_RELE(ovp);
2705 2705
2706 2706 nfs_rw_exit(&odrp->r_rwlock);
2707 2707 nfs_rw_exit(&ndrp->r_rwlock);
2708 2708
2709 2709 return (error);
2710 2710 }
2711 2711
2712 2712 /* ARGSUSED */
2713 2713 static int
2714 2714 nfs_mkdir(vnode_t *dvp, char *nm, struct vattr *va, vnode_t **vpp, cred_t *cr,
2715 2715 caller_context_t *ct, int flags, vsecattr_t *vsecp)
2716 2716 {
2717 2717 int error;
2718 2718 struct nfscreatargs args;
2719 2719 struct nfsdiropres dr;
2720 2720 int douprintf;
2721 2721 rnode_t *drp;
2722 2722 hrtime_t t;
2723 2723
2724 2724 if (nfs_zone() != VTOMI(dvp)->mi_zone)
2725 2725 return (EPERM);
2726 2726
2727 2727 setdiropargs(&args.ca_da, nm, dvp);
2728 2728
2729 2729 /*
2730 2730 * Decide what the group-id and set-gid bit of the created directory
2731 2731 * should be. May have to do a setattr to get the gid right.
2732 2732 */
2733 2733 error = setdirgid(dvp, &va->va_gid, cr);
2734 2734 if (error)
2735 2735 return (error);
2736 2736 error = setdirmode(dvp, &va->va_mode, cr);
2737 2737 if (error)
2738 2738 return (error);
2739 2739 va->va_mask |= AT_MODE|AT_GID;
2740 2740
2741 2741 args.ca_sa = &args.ca_sa_buf;
2742 2742 error = vattr_to_sattr(va, args.ca_sa);
2743 2743 if (error) {
2744 2744 /* req time field(s) overflow - return immediately */
2745 2745 return (error);
2746 2746 }
2747 2747
2748 2748 drp = VTOR(dvp);
2749 2749 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp)))
2750 2750 return (EINTR);
2751 2751
2752 2752 dnlc_remove(dvp, nm);
2753 2753
2754 2754 douprintf = 1;
2755 2755
2756 2756 t = gethrtime();
2757 2757
2758 2758 error = rfs2call(VTOMI(dvp), RFS_MKDIR,
2759 2759 xdr_creatargs, (caddr_t)&args,
2760 2760 xdr_diropres, (caddr_t)&dr, cr,
2761 2761 &douprintf, &dr.dr_status, 0, NULL);
2762 2762
2763 2763 PURGE_ATTRCACHE(dvp); /* mod time changed */
2764 2764
2765 2765 if (!error) {
2766 2766 error = geterrno(dr.dr_status);
2767 2767 if (!error) {
2768 2768 if (HAVE_RDDIR_CACHE(drp))
2769 2769 nfs_purge_rddir_cache(dvp);
2770 2770 /*
2771 2771 * The attributes returned by RFS_MKDIR can not
2772 2772 * be depended upon, so mark the attribute cache
2773 2773 * as purged. A subsequent GETATTR will get the
2774 2774 * correct attributes from the server.
2775 2775 */
2776 2776 *vpp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr,
2777 2777 dvp->v_vfsp, t, cr, NULL, NULL);
2778 2778 PURGE_ATTRCACHE(*vpp);
2779 2779 dnlc_update(dvp, nm, *vpp);
2780 2780
2781 2781 /*
2782 2782 * Make sure the gid was set correctly.
2783 2783 * If not, try to set it (but don't lose
2784 2784 * any sleep over it).
2785 2785 */
2786 2786 if (va->va_gid != VTOR(*vpp)->r_attr.va_gid) {
2787 2787 va->va_mask = AT_GID;
2788 2788 (void) nfssetattr(*vpp, va, 0, cr);
2789 2789 }
2790 2790 } else {
2791 2791 PURGE_STALE_FH(error, dvp, cr);
2792 2792 }
2793 2793 }
2794 2794
2795 2795 nfs_rw_exit(&drp->r_rwlock);
2796 2796
2797 2797 return (error);
2798 2798 }
2799 2799
2800 2800 /* ARGSUSED */
2801 2801 static int
2802 2802 nfs_rmdir(vnode_t *dvp, char *nm, vnode_t *cdir, cred_t *cr,
2803 2803 caller_context_t *ct, int flags)
2804 2804 {
2805 2805 int error;
2806 2806 enum nfsstat status;
2807 2807 struct nfsdiropargs da;
2808 2808 vnode_t *vp;
2809 2809 int douprintf;
2810 2810 rnode_t *drp;
2811 2811
2812 2812 if (nfs_zone() != VTOMI(dvp)->mi_zone)
2813 2813 return (EPERM);
2814 2814 drp = VTOR(dvp);
2815 2815 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp)))
2816 2816 return (EINTR);
2817 2817
2818 2818 /*
2819 2819 * Attempt to prevent a rmdir(".") from succeeding.
2820 2820 */
2821 2821 error = nfslookup(dvp, nm, &vp, NULL, 0, NULL, cr, 0);
2822 2822 if (error) {
2823 2823 nfs_rw_exit(&drp->r_rwlock);
2824 2824 return (error);
2825 2825 }
2826 2826
2827 2827 if (vp == cdir) {
2828 2828 VN_RELE(vp);
2829 2829 nfs_rw_exit(&drp->r_rwlock);
2830 2830 return (EINVAL);
2831 2831 }
2832 2832
2833 2833 setdiropargs(&da, nm, dvp);
2834 2834
2835 2835 /*
2836 2836 * First just remove the entry from the name cache, as it
2837 2837 * is most likely an entry for this vp.
2838 2838 */
2839 2839 dnlc_remove(dvp, nm);
2840 2840
2841 2841 /*
2842 2842 * If there vnode reference count is greater than one, then
2843 2843 * there may be additional references in the DNLC which will
2844 2844 * need to be purged. First, trying removing the entry for
2845 2845 * the parent directory and see if that removes the additional
2846 2846 * reference(s). If that doesn't do it, then use dnlc_purge_vp
2847 2847 * to completely remove any references to the directory which
2848 2848 * might still exist in the DNLC.
2849 2849 */
2850 2850 if (vp->v_count > 1) {
2851 2851 dnlc_remove(vp, "..");
2852 2852 if (vp->v_count > 1)
2853 2853 dnlc_purge_vp(vp);
2854 2854 }
2855 2855
2856 2856 douprintf = 1;
2857 2857
2858 2858 error = rfs2call(VTOMI(dvp), RFS_RMDIR,
2859 2859 xdr_diropargs, (caddr_t)&da,
2860 2860 xdr_enum, (caddr_t)&status, cr,
2861 2861 &douprintf, &status, 0, NULL);
2862 2862
2863 2863 PURGE_ATTRCACHE(dvp); /* mod time changed */
2864 2864
2865 2865 if (error) {
2866 2866 VN_RELE(vp);
2867 2867 nfs_rw_exit(&drp->r_rwlock);
2868 2868 return (error);
2869 2869 }
2870 2870
2871 2871 error = geterrno(status);
2872 2872 if (!error) {
2873 2873 if (HAVE_RDDIR_CACHE(drp))
2874 2874 nfs_purge_rddir_cache(dvp);
2875 2875 if (HAVE_RDDIR_CACHE(VTOR(vp)))
2876 2876 nfs_purge_rddir_cache(vp);
2877 2877 } else {
2878 2878 PURGE_STALE_FH(error, dvp, cr);
2879 2879 /*
2880 2880 * System V defines rmdir to return EEXIST, not
2881 2881 * ENOTEMPTY if the directory is not empty. Over
2882 2882 * the wire, the error is NFSERR_ENOTEMPTY which
2883 2883 * geterrno maps to ENOTEMPTY.
2884 2884 */
2885 2885 if (error == ENOTEMPTY)
2886 2886 error = EEXIST;
2887 2887 }
2888 2888
2889 2889 if (error == 0) {
2890 2890 vnevent_rmdir(vp, dvp, nm, ct);
2891 2891 }
2892 2892 VN_RELE(vp);
2893 2893
2894 2894 nfs_rw_exit(&drp->r_rwlock);
2895 2895
2896 2896 return (error);
2897 2897 }
2898 2898
2899 2899 /* ARGSUSED */
2900 2900 static int
2901 2901 nfs_symlink(vnode_t *dvp, char *lnm, struct vattr *tva, char *tnm, cred_t *cr,
2902 2902 caller_context_t *ct, int flags)
2903 2903 {
2904 2904 int error;
2905 2905 struct nfsslargs args;
2906 2906 enum nfsstat status;
2907 2907 int douprintf;
2908 2908 rnode_t *drp;
2909 2909
2910 2910 if (nfs_zone() != VTOMI(dvp)->mi_zone)
2911 2911 return (EPERM);
2912 2912 setdiropargs(&args.sla_from, lnm, dvp);
2913 2913 args.sla_sa = &args.sla_sa_buf;
2914 2914 error = vattr_to_sattr(tva, args.sla_sa);
2915 2915 if (error) {
2916 2916 /* req time field(s) overflow - return immediately */
2917 2917 return (error);
2918 2918 }
2919 2919 args.sla_tnm = tnm;
2920 2920
2921 2921 drp = VTOR(dvp);
2922 2922 if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp)))
2923 2923 return (EINTR);
2924 2924
2925 2925 dnlc_remove(dvp, lnm);
2926 2926
2927 2927 douprintf = 1;
2928 2928
2929 2929 error = rfs2call(VTOMI(dvp), RFS_SYMLINK,
2930 2930 xdr_slargs, (caddr_t)&args,
2931 2931 xdr_enum, (caddr_t)&status, cr,
2932 2932 &douprintf, &status, 0, NULL);
2933 2933
2934 2934 PURGE_ATTRCACHE(dvp); /* mod time changed */
2935 2935
2936 2936 if (!error) {
2937 2937 error = geterrno(status);
2938 2938 if (!error) {
2939 2939 if (HAVE_RDDIR_CACHE(drp))
2940 2940 nfs_purge_rddir_cache(dvp);
2941 2941 } else {
2942 2942 PURGE_STALE_FH(error, dvp, cr);
2943 2943 }
2944 2944 }
2945 2945
2946 2946 nfs_rw_exit(&drp->r_rwlock);
2947 2947
2948 2948 return (error);
2949 2949 }
2950 2950
2951 2951 #ifdef DEBUG
2952 2952 static int nfs_readdir_cache_hits = 0;
2953 2953 static int nfs_readdir_cache_shorts = 0;
2954 2954 static int nfs_readdir_cache_waits = 0;
2955 2955 static int nfs_readdir_cache_misses = 0;
2956 2956 static int nfs_readdir_readahead = 0;
2957 2957 #endif
2958 2958
2959 2959 static int nfs_shrinkreaddir = 0;
2960 2960
2961 2961 /*
2962 2962 * Read directory entries.
2963 2963 * There are some weird things to look out for here. The uio_offset
2964 2964 * field is either 0 or it is the offset returned from a previous
2965 2965 * readdir. It is an opaque value used by the server to find the
2966 2966 * correct directory block to read. The count field is the number
2967 2967 * of blocks to read on the server. This is advisory only, the server
2968 2968 * may return only one block's worth of entries. Entries may be compressed
2969 2969 * on the server.
2970 2970 */
2971 2971 /* ARGSUSED */
2972 2972 static int
2973 2973 nfs_readdir(vnode_t *vp, struct uio *uiop, cred_t *cr, int *eofp,
2974 2974 caller_context_t *ct, int flags)
2975 2975 {
2976 2976 int error;
2977 2977 size_t count;
2978 2978 rnode_t *rp;
2979 2979 rddir_cache *rdc;
2980 2980 rddir_cache *nrdc;
2981 2981 rddir_cache *rrdc;
2982 2982 #ifdef DEBUG
2983 2983 int missed;
2984 2984 #endif
2985 2985 rddir_cache srdc;
2986 2986 avl_index_t where;
2987 2987
2988 2988 rp = VTOR(vp);
2989 2989
2990 2990 ASSERT(nfs_rw_lock_held(&rp->r_rwlock, RW_READER));
2991 2991 if (nfs_zone() != VTOMI(vp)->mi_zone)
2992 2992 return (EIO);
2993 2993 /*
2994 2994 * Make sure that the directory cache is valid.
2995 2995 */
2996 2996 if (HAVE_RDDIR_CACHE(rp)) {
2997 2997 if (nfs_disable_rddir_cache) {
2998 2998 /*
2999 2999 * Setting nfs_disable_rddir_cache in /etc/system
3000 3000 * allows interoperability with servers that do not
3001 3001 * properly update the attributes of directories.
3002 3002 * Any cached information gets purged before an
3003 3003 * access is made to it.
3004 3004 */
3005 3005 nfs_purge_rddir_cache(vp);
3006 3006 } else {
3007 3007 error = nfs_validate_caches(vp, cr);
3008 3008 if (error)
3009 3009 return (error);
3010 3010 }
3011 3011 }
3012 3012
3013 3013 /*
3014 3014 * UGLINESS: SunOS 3.2 servers apparently cannot always handle an
3015 3015 * RFS_READDIR request with rda_count set to more than 0x400. So
3016 3016 * we reduce the request size here purely for compatibility.
3017 3017 *
3018 3018 * In general, this is no longer required. However, if a server
3019 3019 * is discovered which can not handle requests larger than 1024,
3020 3020 * nfs_shrinkreaddir can be set to 1 to enable this backwards
3021 3021 * compatibility.
3022 3022 *
3023 3023 * In any case, the request size is limited to NFS_MAXDATA bytes.
3024 3024 */
3025 3025 count = MIN(uiop->uio_iov->iov_len,
3026 3026 nfs_shrinkreaddir ? 0x400 : NFS_MAXDATA);
3027 3027
3028 3028 nrdc = NULL;
3029 3029 #ifdef DEBUG
3030 3030 missed = 0;
3031 3031 #endif
3032 3032 top:
3033 3033 /*
3034 3034 * Short circuit last readdir which always returns 0 bytes.
3035 3035 * This can be done after the directory has been read through
3036 3036 * completely at least once. This will set r_direof which
3037 3037 * can be used to find the value of the last cookie.
3038 3038 */
3039 3039 mutex_enter(&rp->r_statelock);
3040 3040 if (rp->r_direof != NULL &&
3041 3041 uiop->uio_offset == rp->r_direof->nfs_ncookie) {
3042 3042 mutex_exit(&rp->r_statelock);
3043 3043 #ifdef DEBUG
3044 3044 nfs_readdir_cache_shorts++;
3045 3045 #endif
3046 3046 if (eofp)
3047 3047 *eofp = 1;
3048 3048 if (nrdc != NULL)
3049 3049 rddir_cache_rele(nrdc);
3050 3050 return (0);
3051 3051 }
3052 3052 /*
3053 3053 * Look for a cache entry. Cache entries are identified
3054 3054 * by the NFS cookie value and the byte count requested.
3055 3055 */
3056 3056 srdc.nfs_cookie = uiop->uio_offset;
3057 3057 srdc.buflen = count;
3058 3058 rdc = avl_find(&rp->r_dir, &srdc, &where);
3059 3059 if (rdc != NULL) {
3060 3060 rddir_cache_hold(rdc);
3061 3061 /*
3062 3062 * If the cache entry is in the process of being
3063 3063 * filled in, wait until this completes. The
3064 3064 * RDDIRWAIT bit is set to indicate that someone
3065 3065 * is waiting and then the thread currently
3066 3066 * filling the entry is done, it should do a
3067 3067 * cv_broadcast to wakeup all of the threads
3068 3068 * waiting for it to finish.
3069 3069 */
3070 3070 if (rdc->flags & RDDIR) {
3071 3071 nfs_rw_exit(&rp->r_rwlock);
3072 3072 rdc->flags |= RDDIRWAIT;
3073 3073 #ifdef DEBUG
3074 3074 nfs_readdir_cache_waits++;
3075 3075 #endif
3076 3076 if (!cv_wait_sig(&rdc->cv, &rp->r_statelock)) {
3077 3077 /*
3078 3078 * We got interrupted, probably
3079 3079 * the user typed ^C or an alarm
3080 3080 * fired. We free the new entry
3081 3081 * if we allocated one.
3082 3082 */
3083 3083 mutex_exit(&rp->r_statelock);
3084 3084 (void) nfs_rw_enter_sig(&rp->r_rwlock,
3085 3085 RW_READER, FALSE);
3086 3086 rddir_cache_rele(rdc);
3087 3087 if (nrdc != NULL)
3088 3088 rddir_cache_rele(nrdc);
3089 3089 return (EINTR);
3090 3090 }
3091 3091 mutex_exit(&rp->r_statelock);
3092 3092 (void) nfs_rw_enter_sig(&rp->r_rwlock,
3093 3093 RW_READER, FALSE);
3094 3094 rddir_cache_rele(rdc);
3095 3095 goto top;
3096 3096 }
3097 3097 /*
3098 3098 * Check to see if a readdir is required to
3099 3099 * fill the entry. If so, mark this entry
3100 3100 * as being filled, remove our reference,
3101 3101 * and branch to the code to fill the entry.
3102 3102 */
3103 3103 if (rdc->flags & RDDIRREQ) {
3104 3104 rdc->flags &= ~RDDIRREQ;
3105 3105 rdc->flags |= RDDIR;
3106 3106 if (nrdc != NULL)
3107 3107 rddir_cache_rele(nrdc);
3108 3108 nrdc = rdc;
3109 3109 mutex_exit(&rp->r_statelock);
3110 3110 goto bottom;
3111 3111 }
3112 3112 #ifdef DEBUG
3113 3113 if (!missed)
3114 3114 nfs_readdir_cache_hits++;
3115 3115 #endif
3116 3116 /*
3117 3117 * If an error occurred while attempting
3118 3118 * to fill the cache entry, just return it.
3119 3119 */
3120 3120 if (rdc->error) {
3121 3121 error = rdc->error;
3122 3122 mutex_exit(&rp->r_statelock);
3123 3123 rddir_cache_rele(rdc);
3124 3124 if (nrdc != NULL)
3125 3125 rddir_cache_rele(nrdc);
3126 3126 return (error);
3127 3127 }
3128 3128
3129 3129 /*
3130 3130 * The cache entry is complete and good,
3131 3131 * copyout the dirent structs to the calling
3132 3132 * thread.
3133 3133 */
3134 3134 error = uiomove(rdc->entries, rdc->entlen, UIO_READ, uiop);
3135 3135
3136 3136 /*
3137 3137 * If no error occurred during the copyout,
3138 3138 * update the offset in the uio struct to
3139 3139 * contain the value of the next cookie
3140 3140 * and set the eof value appropriately.
3141 3141 */
3142 3142 if (!error) {
3143 3143 uiop->uio_offset = rdc->nfs_ncookie;
3144 3144 if (eofp)
3145 3145 *eofp = rdc->eof;
3146 3146 }
3147 3147
3148 3148 /*
3149 3149 * Decide whether to do readahead. Don't if
3150 3150 * have already read to the end of directory.
3151 3151 */
3152 3152 if (rdc->eof) {
3153 3153 rp->r_direof = rdc;
3154 3154 mutex_exit(&rp->r_statelock);
3155 3155 rddir_cache_rele(rdc);
3156 3156 if (nrdc != NULL)
3157 3157 rddir_cache_rele(nrdc);
3158 3158 return (error);
3159 3159 }
3160 3160
3161 3161 /*
3162 3162 * Check to see whether we found an entry
3163 3163 * for the readahead. If so, we don't need
3164 3164 * to do anything further, so free the new
3165 3165 * entry if one was allocated. Otherwise,
3166 3166 * allocate a new entry, add it to the cache,
3167 3167 * and then initiate an asynchronous readdir
3168 3168 * operation to fill it.
3169 3169 */
3170 3170 srdc.nfs_cookie = rdc->nfs_ncookie;
3171 3171 srdc.buflen = count;
3172 3172 rrdc = avl_find(&rp->r_dir, &srdc, &where);
3173 3173 if (rrdc != NULL) {
3174 3174 if (nrdc != NULL)
3175 3175 rddir_cache_rele(nrdc);
3176 3176 } else {
3177 3177 if (nrdc != NULL)
3178 3178 rrdc = nrdc;
3179 3179 else {
3180 3180 rrdc = rddir_cache_alloc(KM_NOSLEEP);
3181 3181 }
3182 3182 if (rrdc != NULL) {
3183 3183 rrdc->nfs_cookie = rdc->nfs_ncookie;
3184 3184 rrdc->buflen = count;
3185 3185 avl_insert(&rp->r_dir, rrdc, where);
3186 3186 rddir_cache_hold(rrdc);
3187 3187 mutex_exit(&rp->r_statelock);
3188 3188 rddir_cache_rele(rdc);
3189 3189 #ifdef DEBUG
3190 3190 nfs_readdir_readahead++;
3191 3191 #endif
3192 3192 nfs_async_readdir(vp, rrdc, cr, nfsreaddir);
3193 3193 return (error);
3194 3194 }
3195 3195 }
3196 3196
3197 3197 mutex_exit(&rp->r_statelock);
3198 3198 rddir_cache_rele(rdc);
3199 3199 return (error);
3200 3200 }
3201 3201
3202 3202 /*
3203 3203 * Didn't find an entry in the cache. Construct a new empty
3204 3204 * entry and link it into the cache. Other processes attempting
3205 3205 * to access this entry will need to wait until it is filled in.
3206 3206 *
3207 3207 * Since kmem_alloc may block, another pass through the cache
3208 3208 * will need to be taken to make sure that another process
3209 3209 * hasn't already added an entry to the cache for this request.
3210 3210 */
3211 3211 if (nrdc == NULL) {
3212 3212 mutex_exit(&rp->r_statelock);
3213 3213 nrdc = rddir_cache_alloc(KM_SLEEP);
3214 3214 nrdc->nfs_cookie = uiop->uio_offset;
3215 3215 nrdc->buflen = count;
3216 3216 goto top;
3217 3217 }
3218 3218
3219 3219 /*
3220 3220 * Add this entry to the cache.
3221 3221 */
3222 3222 avl_insert(&rp->r_dir, nrdc, where);
3223 3223 rddir_cache_hold(nrdc);
3224 3224 mutex_exit(&rp->r_statelock);
3225 3225
3226 3226 bottom:
3227 3227 #ifdef DEBUG
3228 3228 missed = 1;
3229 3229 nfs_readdir_cache_misses++;
3230 3230 #endif
3231 3231 /*
3232 3232 * Do the readdir.
3233 3233 */
3234 3234 error = nfsreaddir(vp, nrdc, cr);
3235 3235
3236 3236 /*
3237 3237 * If this operation failed, just return the error which occurred.
3238 3238 */
3239 3239 if (error != 0)
3240 3240 return (error);
3241 3241
3242 3242 /*
3243 3243 * Since the RPC operation will have taken sometime and blocked
3244 3244 * this process, another pass through the cache will need to be
3245 3245 * taken to find the correct cache entry. It is possible that
3246 3246 * the correct cache entry will not be there (although one was
3247 3247 * added) because the directory changed during the RPC operation
3248 3248 * and the readdir cache was flushed. In this case, just start
3249 3249 * over. It is hoped that this will not happen too often... :-)
3250 3250 */
3251 3251 nrdc = NULL;
3252 3252 goto top;
3253 3253 /* NOTREACHED */
3254 3254 }
3255 3255
3256 3256 static int
3257 3257 nfsreaddir(vnode_t *vp, rddir_cache *rdc, cred_t *cr)
3258 3258 {
3259 3259 int error;
3260 3260 struct nfsrddirargs rda;
3261 3261 struct nfsrddirres rd;
3262 3262 rnode_t *rp;
3263 3263 mntinfo_t *mi;
3264 3264 uint_t count;
3265 3265 int douprintf;
3266 3266 failinfo_t fi, *fip;
3267 3267
3268 3268 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
3269 3269 count = rdc->buflen;
3270 3270
3271 3271 rp = VTOR(vp);
3272 3272 mi = VTOMI(vp);
3273 3273
3274 3274 rda.rda_fh = *VTOFH(vp);
3275 3275 rda.rda_offset = rdc->nfs_cookie;
3276 3276
3277 3277 /*
3278 3278 * NFS client failover support
3279 3279 * suppress failover unless we have a zero cookie
3280 3280 */
3281 3281 if (rdc->nfs_cookie == (off_t)0) {
3282 3282 fi.vp = vp;
3283 3283 fi.fhp = (caddr_t)&rda.rda_fh;
3284 3284 fi.copyproc = nfscopyfh;
3285 3285 fi.lookupproc = nfslookup;
3286 3286 fi.xattrdirproc = acl_getxattrdir2;
3287 3287 fip = &fi;
3288 3288 } else {
3289 3289 fip = NULL;
3290 3290 }
3291 3291
3292 3292 rd.rd_entries = kmem_alloc(rdc->buflen, KM_SLEEP);
3293 3293 rd.rd_size = count;
3294 3294 rd.rd_offset = rda.rda_offset;
3295 3295
3296 3296 douprintf = 1;
3297 3297
3298 3298 if (mi->mi_io_kstats) {
3299 3299 mutex_enter(&mi->mi_lock);
3300 3300 kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats));
3301 3301 mutex_exit(&mi->mi_lock);
3302 3302 }
3303 3303
3304 3304 do {
3305 3305 rda.rda_count = MIN(count, mi->mi_curread);
3306 3306 error = rfs2call(mi, RFS_READDIR,
3307 3307 xdr_rddirargs, (caddr_t)&rda,
3308 3308 xdr_getrddirres, (caddr_t)&rd, cr,
3309 3309 &douprintf, &rd.rd_status, 0, fip);
3310 3310 } while (error == ENFS_TRYAGAIN);
3311 3311
3312 3312 if (mi->mi_io_kstats) {
3313 3313 mutex_enter(&mi->mi_lock);
3314 3314 kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats));
3315 3315 mutex_exit(&mi->mi_lock);
3316 3316 }
3317 3317
3318 3318 /*
3319 3319 * Since we are actually doing a READDIR RPC, we must have
3320 3320 * exclusive access to the cache entry being filled. Thus,
3321 3321 * it is safe to update all fields except for the flags
3322 3322 * field. The r_statelock in the rnode must be held to
3323 3323 * prevent two different threads from simultaneously
3324 3324 * attempting to update the flags field. This can happen
3325 3325 * if we are turning off RDDIR and the other thread is
3326 3326 * trying to set RDDIRWAIT.
3327 3327 */
3328 3328 ASSERT(rdc->flags & RDDIR);
3329 3329 if (!error) {
3330 3330 error = geterrno(rd.rd_status);
3331 3331 if (!error) {
3332 3332 rdc->nfs_ncookie = rd.rd_offset;
3333 3333 rdc->eof = rd.rd_eof ? 1 : 0;
3334 3334 rdc->entlen = rd.rd_size;
3335 3335 ASSERT(rdc->entlen <= rdc->buflen);
3336 3336 #ifdef DEBUG
3337 3337 rdc->entries = rddir_cache_buf_alloc(rdc->buflen,
3338 3338 KM_SLEEP);
3339 3339 #else
3340 3340 rdc->entries = kmem_alloc(rdc->buflen, KM_SLEEP);
3341 3341 #endif
3342 3342 bcopy(rd.rd_entries, rdc->entries, rdc->entlen);
3343 3343 rdc->error = 0;
3344 3344 if (mi->mi_io_kstats) {
3345 3345 mutex_enter(&mi->mi_lock);
3346 3346 KSTAT_IO_PTR(mi->mi_io_kstats)->reads++;
3347 3347 KSTAT_IO_PTR(mi->mi_io_kstats)->nread +=
3348 3348 rd.rd_size;
3349 3349 mutex_exit(&mi->mi_lock);
3350 3350 }
3351 3351 } else {
3352 3352 PURGE_STALE_FH(error, vp, cr);
3353 3353 }
3354 3354 }
3355 3355 if (error) {
3356 3356 rdc->entries = NULL;
3357 3357 rdc->error = error;
3358 3358 }
3359 3359 kmem_free(rd.rd_entries, rdc->buflen);
3360 3360
3361 3361 mutex_enter(&rp->r_statelock);
3362 3362 rdc->flags &= ~RDDIR;
3363 3363 if (rdc->flags & RDDIRWAIT) {
3364 3364 rdc->flags &= ~RDDIRWAIT;
3365 3365 cv_broadcast(&rdc->cv);
3366 3366 }
3367 3367 if (error)
3368 3368 rdc->flags |= RDDIRREQ;
3369 3369 mutex_exit(&rp->r_statelock);
3370 3370
3371 3371 rddir_cache_rele(rdc);
3372 3372
3373 3373 return (error);
3374 3374 }
3375 3375
3376 3376 #ifdef DEBUG
3377 3377 static int nfs_bio_do_stop = 0;
3378 3378 #endif
3379 3379
3380 3380 static int
3381 3381 nfs_bio(struct buf *bp, cred_t *cr)
3382 3382 {
3383 3383 rnode_t *rp = VTOR(bp->b_vp);
3384 3384 int count;
3385 3385 int error;
3386 3386 cred_t *cred;
3387 3387 uint_t offset;
3388 3388
3389 3389 DTRACE_IO1(start, struct buf *, bp);
3390 3390
3391 3391 ASSERT(nfs_zone() == VTOMI(bp->b_vp)->mi_zone);
3392 3392 offset = dbtob(bp->b_blkno);
3393 3393
3394 3394 if (bp->b_flags & B_READ) {
3395 3395 mutex_enter(&rp->r_statelock);
3396 3396 if (rp->r_cred != NULL) {
3397 3397 cred = rp->r_cred;
3398 3398 crhold(cred);
3399 3399 } else {
3400 3400 rp->r_cred = cr;
3401 3401 crhold(cr);
3402 3402 cred = cr;
3403 3403 crhold(cred);
3404 3404 }
3405 3405 mutex_exit(&rp->r_statelock);
3406 3406 read_again:
3407 3407 error = bp->b_error = nfsread(bp->b_vp, bp->b_un.b_addr,
3408 3408 offset, bp->b_bcount, &bp->b_resid, cred);
3409 3409
3410 3410 crfree(cred);
3411 3411 if (!error) {
3412 3412 if (bp->b_resid) {
3413 3413 /*
3414 3414 * Didn't get it all because we hit EOF,
3415 3415 * zero all the memory beyond the EOF.
3416 3416 */
3417 3417 /* bzero(rdaddr + */
3418 3418 bzero(bp->b_un.b_addr +
3419 3419 bp->b_bcount - bp->b_resid, bp->b_resid);
3420 3420 }
3421 3421 mutex_enter(&rp->r_statelock);
3422 3422 if (bp->b_resid == bp->b_bcount &&
3423 3423 offset >= rp->r_size) {
3424 3424 /*
3425 3425 * We didn't read anything at all as we are
3426 3426 * past EOF. Return an error indicator back
3427 3427 * but don't destroy the pages (yet).
3428 3428 */
3429 3429 error = NFS_EOF;
3430 3430 }
3431 3431 mutex_exit(&rp->r_statelock);
3432 3432 } else if (error == EACCES) {
3433 3433 mutex_enter(&rp->r_statelock);
3434 3434 if (cred != cr) {
3435 3435 if (rp->r_cred != NULL)
3436 3436 crfree(rp->r_cred);
3437 3437 rp->r_cred = cr;
3438 3438 crhold(cr);
3439 3439 cred = cr;
3440 3440 crhold(cred);
3441 3441 mutex_exit(&rp->r_statelock);
3442 3442 goto read_again;
3443 3443 }
3444 3444 mutex_exit(&rp->r_statelock);
3445 3445 }
3446 3446 } else {
3447 3447 if (!(rp->r_flags & RSTALE)) {
3448 3448 mutex_enter(&rp->r_statelock);
3449 3449 if (rp->r_cred != NULL) {
3450 3450 cred = rp->r_cred;
3451 3451 crhold(cred);
3452 3452 } else {
3453 3453 rp->r_cred = cr;
3454 3454 crhold(cr);
3455 3455 cred = cr;
3456 3456 crhold(cred);
3457 3457 }
3458 3458 mutex_exit(&rp->r_statelock);
3459 3459 write_again:
3460 3460 mutex_enter(&rp->r_statelock);
3461 3461 count = MIN(bp->b_bcount, rp->r_size - offset);
3462 3462 mutex_exit(&rp->r_statelock);
3463 3463 if (count < 0)
3464 3464 cmn_err(CE_PANIC, "nfs_bio: write count < 0");
3465 3465 #ifdef DEBUG
3466 3466 if (count == 0) {
3467 3467 zcmn_err(getzoneid(), CE_WARN,
3468 3468 "nfs_bio: zero length write at %d",
3469 3469 offset);
3470 3470 nfs_printfhandle(&rp->r_fh);
3471 3471 if (nfs_bio_do_stop)
3472 3472 debug_enter("nfs_bio");
3473 3473 }
3474 3474 #endif
3475 3475 error = nfswrite(bp->b_vp, bp->b_un.b_addr, offset,
3476 3476 count, cred);
3477 3477 if (error == EACCES) {
3478 3478 mutex_enter(&rp->r_statelock);
3479 3479 if (cred != cr) {
3480 3480 if (rp->r_cred != NULL)
3481 3481 crfree(rp->r_cred);
3482 3482 rp->r_cred = cr;
3483 3483 crhold(cr);
3484 3484 crfree(cred);
3485 3485 cred = cr;
3486 3486 crhold(cred);
3487 3487 mutex_exit(&rp->r_statelock);
3488 3488 goto write_again;
3489 3489 }
3490 3490 mutex_exit(&rp->r_statelock);
3491 3491 }
3492 3492 bp->b_error = error;
3493 3493 if (error && error != EINTR) {
3494 3494 /*
3495 3495 * Don't print EDQUOT errors on the console.
3496 3496 * Don't print asynchronous EACCES errors.
3497 3497 * Don't print EFBIG errors.
3498 3498 * Print all other write errors.
3499 3499 */
3500 3500 if (error != EDQUOT && error != EFBIG &&
3501 3501 (error != EACCES ||
3502 3502 !(bp->b_flags & B_ASYNC)))
3503 3503 nfs_write_error(bp->b_vp, error, cred);
3504 3504 /*
3505 3505 * Update r_error and r_flags as appropriate.
3506 3506 * If the error was ESTALE, then mark the
3507 3507 * rnode as not being writeable and save
3508 3508 * the error status. Otherwise, save any
3509 3509 * errors which occur from asynchronous
3510 3510 * page invalidations. Any errors occurring
3511 3511 * from other operations should be saved
3512 3512 * by the caller.
3513 3513 */
3514 3514 mutex_enter(&rp->r_statelock);
3515 3515 if (error == ESTALE) {
3516 3516 rp->r_flags |= RSTALE;
3517 3517 if (!rp->r_error)
3518 3518 rp->r_error = error;
3519 3519 } else if (!rp->r_error &&
3520 3520 (bp->b_flags &
3521 3521 (B_INVAL|B_FORCE|B_ASYNC)) ==
3522 3522 (B_INVAL|B_FORCE|B_ASYNC)) {
3523 3523 rp->r_error = error;
3524 3524 }
3525 3525 mutex_exit(&rp->r_statelock);
3526 3526 }
3527 3527 crfree(cred);
3528 3528 } else {
3529 3529 error = rp->r_error;
3530 3530 /*
3531 3531 * A close may have cleared r_error, if so,
3532 3532 * propagate ESTALE error return properly
3533 3533 */
3534 3534 if (error == 0)
3535 3535 error = ESTALE;
3536 3536 }
3537 3537 }
3538 3538
3539 3539 if (error != 0 && error != NFS_EOF)
3540 3540 bp->b_flags |= B_ERROR;
3541 3541
3542 3542 DTRACE_IO1(done, struct buf *, bp);
3543 3543
3544 3544 return (error);
3545 3545 }
3546 3546
3547 3547 /* ARGSUSED */
3548 3548 static int
3549 3549 nfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
3550 3550 {
3551 3551 struct nfs_fid *fp;
3552 3552 rnode_t *rp;
3553 3553
3554 3554 rp = VTOR(vp);
3555 3555
3556 3556 if (fidp->fid_len < (sizeof (struct nfs_fid) - sizeof (short))) {
3557 3557 fidp->fid_len = sizeof (struct nfs_fid) - sizeof (short);
3558 3558 return (ENOSPC);
3559 3559 }
3560 3560 fp = (struct nfs_fid *)fidp;
3561 3561 fp->nf_pad = 0;
3562 3562 fp->nf_len = sizeof (struct nfs_fid) - sizeof (short);
3563 3563 bcopy(rp->r_fh.fh_buf, fp->nf_data, NFS_FHSIZE);
3564 3564 return (0);
3565 3565 }
3566 3566
3567 3567 /* ARGSUSED2 */
3568 3568 static int
3569 3569 nfs_rwlock(vnode_t *vp, int write_lock, caller_context_t *ctp)
3570 3570 {
3571 3571 rnode_t *rp = VTOR(vp);
3572 3572
3573 3573 if (!write_lock) {
3574 3574 (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE);
3575 3575 return (V_WRITELOCK_FALSE);
3576 3576 }
3577 3577
3578 3578 if ((rp->r_flags & RDIRECTIO) || (VTOMI(vp)->mi_flags & MI_DIRECTIO)) {
3579 3579 (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE);
3580 3580 if (rp->r_mapcnt == 0 && !vn_has_cached_data(vp))
3581 3581 return (V_WRITELOCK_FALSE);
3582 3582 nfs_rw_exit(&rp->r_rwlock);
3583 3583 }
3584 3584
3585 3585 (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER, FALSE);
3586 3586 return (V_WRITELOCK_TRUE);
3587 3587 }
3588 3588
3589 3589 /* ARGSUSED */
3590 3590 static void
3591 3591 nfs_rwunlock(vnode_t *vp, int write_lock, caller_context_t *ctp)
3592 3592 {
3593 3593 rnode_t *rp = VTOR(vp);
3594 3594
3595 3595 nfs_rw_exit(&rp->r_rwlock);
3596 3596 }
3597 3597
3598 3598 /* ARGSUSED */
3599 3599 static int
3600 3600 nfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct)
3601 3601 {
3602 3602
3603 3603 /*
3604 3604 * Because we stuff the readdir cookie into the offset field
3605 3605 * someone may attempt to do an lseek with the cookie which
3606 3606 * we want to succeed.
3607 3607 */
3608 3608 if (vp->v_type == VDIR)
3609 3609 return (0);
3610 3610 if (*noffp < 0 || *noffp > MAXOFF32_T)
3611 3611 return (EINVAL);
3612 3612 return (0);
3613 3613 }
3614 3614
3615 3615 /*
3616 3616 * number of NFS_MAXDATA blocks to read ahead
3617 3617 * optimized for 100 base-T.
3618 3618 */
3619 3619 static int nfs_nra = 4;
3620 3620
3621 3621 #ifdef DEBUG
3622 3622 static int nfs_lostpage = 0; /* number of times we lost original page */
3623 3623 #endif
3624 3624
3625 3625 /*
3626 3626 * Return all the pages from [off..off+len) in file
3627 3627 */
3628 3628 /* ARGSUSED */
3629 3629 static int
3630 3630 nfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp,
3631 3631 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
3632 3632 enum seg_rw rw, cred_t *cr, caller_context_t *ct)
3633 3633 {
3634 3634 rnode_t *rp;
3635 3635 int error;
3636 3636 mntinfo_t *mi;
3637 3637
3638 3638 if (vp->v_flag & VNOMAP)
3639 3639 return (ENOSYS);
3640 3640
3641 3641 ASSERT(off <= MAXOFF32_T);
3642 3642 if (nfs_zone() != VTOMI(vp)->mi_zone)
3643 3643 return (EIO);
3644 3644 if (protp != NULL)
3645 3645 *protp = PROT_ALL;
3646 3646
3647 3647 /*
3648 3648 * Now valididate that the caches are up to date.
3649 3649 */
3650 3650 error = nfs_validate_caches(vp, cr);
3651 3651 if (error)
3652 3652 return (error);
3653 3653
3654 3654 rp = VTOR(vp);
3655 3655 mi = VTOMI(vp);
3656 3656 retry:
3657 3657 mutex_enter(&rp->r_statelock);
3658 3658
3659 3659 /*
3660 3660 * Don't create dirty pages faster than they
3661 3661 * can be cleaned so that the system doesn't
3662 3662 * get imbalanced. If the async queue is
3663 3663 * maxed out, then wait for it to drain before
3664 3664 * creating more dirty pages. Also, wait for
3665 3665 * any threads doing pagewalks in the vop_getattr
3666 3666 * entry points so that they don't block for
3667 3667 * long periods.
3668 3668 */
3669 3669 if (rw == S_CREATE) {
3670 3670 while ((mi->mi_max_threads != 0 &&
3671 3671 rp->r_awcount > 2 * mi->mi_max_threads) ||
3672 3672 rp->r_gcount > 0)
3673 3673 cv_wait(&rp->r_cv, &rp->r_statelock);
3674 3674 }
3675 3675
3676 3676 /*
3677 3677 * If we are getting called as a side effect of an nfs_write()
3678 3678 * operation the local file size might not be extended yet.
3679 3679 * In this case we want to be able to return pages of zeroes.
3680 3680 */
3681 3681 if (off + len > rp->r_size + PAGEOFFSET && seg != segkmap) {
3682 3682 mutex_exit(&rp->r_statelock);
3683 3683 return (EFAULT); /* beyond EOF */
3684 3684 }
3685 3685
3686 3686 mutex_exit(&rp->r_statelock);
3687 3687
3688 3688 error = pvn_getpages(nfs_getapage, vp, off, len, protp, pl, plsz,
3689 3689 seg, addr, rw, cr);
3690 3690
3691 3691 switch (error) {
3692 3692 case NFS_EOF:
3693 3693 nfs_purge_caches(vp, NFS_NOPURGE_DNLC, cr);
3694 3694 goto retry;
3695 3695 case ESTALE:
3696 3696 PURGE_STALE_FH(error, vp, cr);
3697 3697 }
3698 3698
3699 3699 return (error);
3700 3700 }
3701 3701
3702 3702 /*
3703 3703 * Called from pvn_getpages to get a particular page.
3704 3704 */
3705 3705 /* ARGSUSED */
3706 3706 static int
3707 3707 nfs_getapage(vnode_t *vp, u_offset_t off, size_t len, uint_t *protp,
3708 3708 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
3709 3709 enum seg_rw rw, cred_t *cr)
3710 3710 {
3711 3711 rnode_t *rp;
3712 3712 uint_t bsize;
3713 3713 struct buf *bp;
3714 3714 page_t *pp;
3715 3715 u_offset_t lbn;
3716 3716 u_offset_t io_off;
3717 3717 u_offset_t blkoff;
3718 3718 u_offset_t rablkoff;
3719 3719 size_t io_len;
3720 3720 uint_t blksize;
3721 3721 int error;
3722 3722 int readahead;
3723 3723 int readahead_issued = 0;
3724 3724 int ra_window; /* readahead window */
3725 3725 page_t *pagefound;
3726 3726
3727 3727 if (nfs_zone() != VTOMI(vp)->mi_zone)
3728 3728 return (EIO);
3729 3729 rp = VTOR(vp);
3730 3730 bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE);
3731 3731
3732 3732 reread:
3733 3733 bp = NULL;
3734 3734 pp = NULL;
3735 3735 pagefound = NULL;
3736 3736
3737 3737 if (pl != NULL)
3738 3738 pl[0] = NULL;
3739 3739
3740 3740 error = 0;
3741 3741 lbn = off / bsize;
3742 3742 blkoff = lbn * bsize;
3743 3743
3744 3744 /*
3745 3745 * Queueing up the readahead before doing the synchronous read
3746 3746 * results in a significant increase in read throughput because
3747 3747 * of the increased parallelism between the async threads and
3748 3748 * the process context.
3749 3749 */
3750 3750 if ((off & ((vp->v_vfsp->vfs_bsize) - 1)) == 0 &&
3751 3751 rw != S_CREATE &&
3752 3752 !(vp->v_flag & VNOCACHE)) {
3753 3753 mutex_enter(&rp->r_statelock);
3754 3754
3755 3755 /*
3756 3756 * Calculate the number of readaheads to do.
3757 3757 * a) No readaheads at offset = 0.
3758 3758 * b) Do maximum(nfs_nra) readaheads when the readahead
3759 3759 * window is closed.
3760 3760 * c) Do readaheads between 1 to (nfs_nra - 1) depending
3761 3761 * upon how far the readahead window is open or close.
3762 3762 * d) No readaheads if rp->r_nextr is not within the scope
3763 3763 * of the readahead window (random i/o).
3764 3764 */
3765 3765
3766 3766 if (off == 0)
3767 3767 readahead = 0;
3768 3768 else if (blkoff == rp->r_nextr)
3769 3769 readahead = nfs_nra;
3770 3770 else if (rp->r_nextr > blkoff &&
3771 3771 ((ra_window = (rp->r_nextr - blkoff) / bsize)
3772 3772 <= (nfs_nra - 1)))
3773 3773 readahead = nfs_nra - ra_window;
3774 3774 else
3775 3775 readahead = 0;
3776 3776
3777 3777 rablkoff = rp->r_nextr;
3778 3778 while (readahead > 0 && rablkoff + bsize < rp->r_size) {
3779 3779 mutex_exit(&rp->r_statelock);
3780 3780 if (nfs_async_readahead(vp, rablkoff + bsize,
3781 3781 addr + (rablkoff + bsize - off), seg, cr,
3782 3782 nfs_readahead) < 0) {
3783 3783 mutex_enter(&rp->r_statelock);
3784 3784 break;
3785 3785 }
3786 3786 readahead--;
3787 3787 rablkoff += bsize;
3788 3788 /*
3789 3789 * Indicate that we did a readahead so
3790 3790 * readahead offset is not updated
3791 3791 * by the synchronous read below.
3792 3792 */
3793 3793 readahead_issued = 1;
3794 3794 mutex_enter(&rp->r_statelock);
3795 3795 /*
3796 3796 * set readahead offset to
3797 3797 * offset of last async readahead
3798 3798 * request.
3799 3799 */
3800 3800 rp->r_nextr = rablkoff;
3801 3801 }
3802 3802 mutex_exit(&rp->r_statelock);
3803 3803 }
3804 3804
3805 3805 again:
3806 3806 if ((pagefound = page_exists(vp, off)) == NULL) {
3807 3807 if (pl == NULL) {
3808 3808 (void) nfs_async_readahead(vp, blkoff, addr, seg, cr,
3809 3809 nfs_readahead);
3810 3810 } else if (rw == S_CREATE) {
3811 3811 /*
3812 3812 * Block for this page is not allocated, or the offset
3813 3813 * is beyond the current allocation size, or we're
3814 3814 * allocating a swap slot and the page was not found,
3815 3815 * so allocate it and return a zero page.
3816 3816 */
3817 3817 if ((pp = page_create_va(vp, off,
3818 3818 PAGESIZE, PG_WAIT, seg, addr)) == NULL)
3819 3819 cmn_err(CE_PANIC, "nfs_getapage: page_create");
3820 3820 io_len = PAGESIZE;
3821 3821 mutex_enter(&rp->r_statelock);
3822 3822 rp->r_nextr = off + PAGESIZE;
3823 3823 mutex_exit(&rp->r_statelock);
3824 3824 } else {
3825 3825 /*
3826 3826 * Need to go to server to get a BLOCK, exception to
3827 3827 * that being while reading at offset = 0 or doing
3828 3828 * random i/o, in that case read only a PAGE.
3829 3829 */
3830 3830 mutex_enter(&rp->r_statelock);
3831 3831 if (blkoff < rp->r_size &&
3832 3832 blkoff + bsize >= rp->r_size) {
3833 3833 /*
3834 3834 * If only a block or less is left in
3835 3835 * the file, read all that is remaining.
3836 3836 */
3837 3837 if (rp->r_size <= off) {
3838 3838 /*
3839 3839 * Trying to access beyond EOF,
3840 3840 * set up to get at least one page.
3841 3841 */
3842 3842 blksize = off + PAGESIZE - blkoff;
3843 3843 } else
3844 3844 blksize = rp->r_size - blkoff;
3845 3845 } else if ((off == 0) ||
3846 3846 (off != rp->r_nextr && !readahead_issued)) {
3847 3847 blksize = PAGESIZE;
3848 3848 blkoff = off; /* block = page here */
3849 3849 } else
3850 3850 blksize = bsize;
3851 3851 mutex_exit(&rp->r_statelock);
3852 3852
3853 3853 pp = pvn_read_kluster(vp, off, seg, addr, &io_off,
3854 3854 &io_len, blkoff, blksize, 0);
3855 3855
3856 3856 /*
3857 3857 * Some other thread has entered the page,
3858 3858 * so just use it.
3859 3859 */
3860 3860 if (pp == NULL)
3861 3861 goto again;
3862 3862
3863 3863 /*
3864 3864 * Now round the request size up to page boundaries.
3865 3865 * This ensures that the entire page will be
3866 3866 * initialized to zeroes if EOF is encountered.
3867 3867 */
3868 3868 io_len = ptob(btopr(io_len));
3869 3869
3870 3870 bp = pageio_setup(pp, io_len, vp, B_READ);
3871 3871 ASSERT(bp != NULL);
3872 3872
3873 3873 /*
3874 3874 * pageio_setup should have set b_addr to 0. This
3875 3875 * is correct since we want to do I/O on a page
3876 3876 * boundary. bp_mapin will use this addr to calculate
3877 3877 * an offset, and then set b_addr to the kernel virtual
3878 3878 * address it allocated for us.
3879 3879 */
3880 3880 ASSERT(bp->b_un.b_addr == 0);
3881 3881
3882 3882 bp->b_edev = 0;
3883 3883 bp->b_dev = 0;
3884 3884 bp->b_lblkno = lbtodb(io_off);
3885 3885 bp->b_file = vp;
3886 3886 bp->b_offset = (offset_t)off;
3887 3887 bp_mapin(bp);
3888 3888
3889 3889 /*
3890 3890 * If doing a write beyond what we believe is EOF,
3891 3891 * don't bother trying to read the pages from the
3892 3892 * server, we'll just zero the pages here. We
3893 3893 * don't check that the rw flag is S_WRITE here
3894 3894 * because some implementations may attempt a
3895 3895 * read access to the buffer before copying data.
3896 3896 */
3897 3897 mutex_enter(&rp->r_statelock);
3898 3898 if (io_off >= rp->r_size && seg == segkmap) {
3899 3899 mutex_exit(&rp->r_statelock);
3900 3900 bzero(bp->b_un.b_addr, io_len);
3901 3901 } else {
3902 3902 mutex_exit(&rp->r_statelock);
3903 3903 error = nfs_bio(bp, cr);
3904 3904 }
3905 3905
3906 3906 /*
3907 3907 * Unmap the buffer before freeing it.
3908 3908 */
3909 3909 bp_mapout(bp);
3910 3910 pageio_done(bp);
3911 3911
3912 3912 if (error == NFS_EOF) {
3913 3913 /*
3914 3914 * If doing a write system call just return
3915 3915 * zeroed pages, else user tried to get pages
3916 3916 * beyond EOF, return error. We don't check
3917 3917 * that the rw flag is S_WRITE here because
3918 3918 * some implementations may attempt a read
3919 3919 * access to the buffer before copying data.
3920 3920 */
3921 3921 if (seg == segkmap)
3922 3922 error = 0;
3923 3923 else
3924 3924 error = EFAULT;
3925 3925 }
3926 3926
3927 3927 if (!readahead_issued && !error) {
3928 3928 mutex_enter(&rp->r_statelock);
3929 3929 rp->r_nextr = io_off + io_len;
3930 3930 mutex_exit(&rp->r_statelock);
3931 3931 }
3932 3932 }
3933 3933 }
3934 3934
3935 3935 out:
3936 3936 if (pl == NULL)
3937 3937 return (error);
3938 3938
3939 3939 if (error) {
3940 3940 if (pp != NULL)
3941 3941 pvn_read_done(pp, B_ERROR);
3942 3942 return (error);
3943 3943 }
3944 3944
3945 3945 if (pagefound) {
3946 3946 se_t se = (rw == S_CREATE ? SE_EXCL : SE_SHARED);
3947 3947
3948 3948 /*
3949 3949 * Page exists in the cache, acquire the appropriate lock.
3950 3950 * If this fails, start all over again.
3951 3951 */
3952 3952 if ((pp = page_lookup(vp, off, se)) == NULL) {
3953 3953 #ifdef DEBUG
3954 3954 nfs_lostpage++;
3955 3955 #endif
3956 3956 goto reread;
3957 3957 }
3958 3958 pl[0] = pp;
3959 3959 pl[1] = NULL;
3960 3960 return (0);
3961 3961 }
3962 3962
3963 3963 if (pp != NULL)
3964 3964 pvn_plist_init(pp, pl, plsz, off, io_len, rw);
3965 3965
3966 3966 return (error);
3967 3967 }
3968 3968
3969 3969 static void
3970 3970 nfs_readahead(vnode_t *vp, u_offset_t blkoff, caddr_t addr, struct seg *seg,
3971 3971 cred_t *cr)
3972 3972 {
3973 3973 int error;
3974 3974 page_t *pp;
3975 3975 u_offset_t io_off;
3976 3976 size_t io_len;
3977 3977 struct buf *bp;
3978 3978 uint_t bsize, blksize;
3979 3979 rnode_t *rp = VTOR(vp);
3980 3980
3981 3981 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
3982 3982
3983 3983 bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE);
3984 3984
3985 3985 mutex_enter(&rp->r_statelock);
3986 3986 if (blkoff < rp->r_size && blkoff + bsize > rp->r_size) {
3987 3987 /*
3988 3988 * If less than a block left in file read less
3989 3989 * than a block.
3990 3990 */
3991 3991 blksize = rp->r_size - blkoff;
3992 3992 } else
3993 3993 blksize = bsize;
3994 3994 mutex_exit(&rp->r_statelock);
3995 3995
3996 3996 pp = pvn_read_kluster(vp, blkoff, segkmap, addr,
3997 3997 &io_off, &io_len, blkoff, blksize, 1);
3998 3998 /*
3999 3999 * The isra flag passed to the kluster function is 1, we may have
4000 4000 * gotten a return value of NULL for a variety of reasons (# of free
4001 4001 * pages < minfree, someone entered the page on the vnode etc). In all
4002 4002 * cases, we want to punt on the readahead.
4003 4003 */
4004 4004 if (pp == NULL)
4005 4005 return;
4006 4006
4007 4007 /*
4008 4008 * Now round the request size up to page boundaries.
4009 4009 * This ensures that the entire page will be
4010 4010 * initialized to zeroes if EOF is encountered.
4011 4011 */
4012 4012 io_len = ptob(btopr(io_len));
4013 4013
4014 4014 bp = pageio_setup(pp, io_len, vp, B_READ);
4015 4015 ASSERT(bp != NULL);
4016 4016
4017 4017 /*
4018 4018 * pageio_setup should have set b_addr to 0. This is correct since
4019 4019 * we want to do I/O on a page boundary. bp_mapin() will use this addr
4020 4020 * to calculate an offset, and then set b_addr to the kernel virtual
4021 4021 * address it allocated for us.
4022 4022 */
4023 4023 ASSERT(bp->b_un.b_addr == 0);
4024 4024
4025 4025 bp->b_edev = 0;
4026 4026 bp->b_dev = 0;
4027 4027 bp->b_lblkno = lbtodb(io_off);
4028 4028 bp->b_file = vp;
4029 4029 bp->b_offset = (offset_t)blkoff;
4030 4030 bp_mapin(bp);
4031 4031
4032 4032 /*
4033 4033 * If doing a write beyond what we believe is EOF, don't bother trying
4034 4034 * to read the pages from the server, we'll just zero the pages here.
4035 4035 * We don't check that the rw flag is S_WRITE here because some
4036 4036 * implementations may attempt a read access to the buffer before
4037 4037 * copying data.
4038 4038 */
4039 4039 mutex_enter(&rp->r_statelock);
4040 4040 if (io_off >= rp->r_size && seg == segkmap) {
4041 4041 mutex_exit(&rp->r_statelock);
4042 4042 bzero(bp->b_un.b_addr, io_len);
4043 4043 error = 0;
4044 4044 } else {
4045 4045 mutex_exit(&rp->r_statelock);
4046 4046 error = nfs_bio(bp, cr);
4047 4047 if (error == NFS_EOF)
4048 4048 error = 0;
4049 4049 }
4050 4050
4051 4051 /*
4052 4052 * Unmap the buffer before freeing it.
4053 4053 */
4054 4054 bp_mapout(bp);
4055 4055 pageio_done(bp);
4056 4056
4057 4057 pvn_read_done(pp, error ? B_READ | B_ERROR : B_READ);
4058 4058
4059 4059 /*
4060 4060 * In case of error set readahead offset
4061 4061 * to the lowest offset.
4062 4062 * pvn_read_done() calls VN_DISPOSE to destroy the pages
4063 4063 */
4064 4064 if (error && rp->r_nextr > io_off) {
4065 4065 mutex_enter(&rp->r_statelock);
4066 4066 if (rp->r_nextr > io_off)
4067 4067 rp->r_nextr = io_off;
4068 4068 mutex_exit(&rp->r_statelock);
4069 4069 }
4070 4070 }
4071 4071
4072 4072 /*
4073 4073 * Flags are composed of {B_INVAL, B_FREE, B_DONTNEED, B_FORCE}
4074 4074 * If len == 0, do from off to EOF.
4075 4075 *
4076 4076 * The normal cases should be len == 0 && off == 0 (entire vp list),
4077 4077 * len == MAXBSIZE (from segmap_release actions), and len == PAGESIZE
4078 4078 * (from pageout).
4079 4079 */
4080 4080 /* ARGSUSED */
4081 4081 static int
4082 4082 nfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr,
4083 4083 caller_context_t *ct)
4084 4084 {
4085 4085 int error;
4086 4086 rnode_t *rp;
4087 4087
4088 4088 ASSERT(cr != NULL);
4089 4089
4090 4090 /*
4091 4091 * XXX - Why should this check be made here?
4092 4092 */
4093 4093 if (vp->v_flag & VNOMAP)
4094 4094 return (ENOSYS);
4095 4095
4096 4096 if (len == 0 && !(flags & B_INVAL) && vn_is_readonly(vp))
4097 4097 return (0);
4098 4098
4099 4099 if (!(flags & B_ASYNC) && nfs_zone() != VTOMI(vp)->mi_zone)
4100 4100 return (EIO);
4101 4101 ASSERT(off <= MAXOFF32_T);
4102 4102
4103 4103 rp = VTOR(vp);
4104 4104 mutex_enter(&rp->r_statelock);
4105 4105 rp->r_count++;
4106 4106 mutex_exit(&rp->r_statelock);
4107 4107 error = nfs_putpages(vp, off, len, flags, cr);
4108 4108 mutex_enter(&rp->r_statelock);
4109 4109 rp->r_count--;
4110 4110 cv_broadcast(&rp->r_cv);
4111 4111 mutex_exit(&rp->r_statelock);
4112 4112
4113 4113 return (error);
4114 4114 }
4115 4115
4116 4116 /*
4117 4117 * Write out a single page, possibly klustering adjacent dirty pages.
4118 4118 */
4119 4119 int
4120 4120 nfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
4121 4121 int flags, cred_t *cr)
4122 4122 {
4123 4123 u_offset_t io_off;
4124 4124 u_offset_t lbn_off;
4125 4125 u_offset_t lbn;
4126 4126 size_t io_len;
4127 4127 uint_t bsize;
4128 4128 int error;
4129 4129 rnode_t *rp;
4130 4130
4131 4131 ASSERT(!vn_is_readonly(vp));
4132 4132 ASSERT(pp != NULL);
4133 4133 ASSERT(cr != NULL);
4134 4134 ASSERT((flags & B_ASYNC) || nfs_zone() == VTOMI(vp)->mi_zone);
4135 4135
4136 4136 rp = VTOR(vp);
4137 4137 ASSERT(rp->r_count > 0);
4138 4138
4139 4139 ASSERT(pp->p_offset <= MAXOFF32_T);
4140 4140
4141 4141 bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE);
4142 4142 lbn = pp->p_offset / bsize;
4143 4143 lbn_off = lbn * bsize;
4144 4144
4145 4145 /*
4146 4146 * Find a kluster that fits in one block, or in
4147 4147 * one page if pages are bigger than blocks. If
4148 4148 * there is less file space allocated than a whole
4149 4149 * page, we'll shorten the i/o request below.
4150 4150 */
4151 4151 pp = pvn_write_kluster(vp, pp, &io_off, &io_len, lbn_off,
4152 4152 roundup(bsize, PAGESIZE), flags);
4153 4153
4154 4154 /*
4155 4155 * pvn_write_kluster shouldn't have returned a page with offset
4156 4156 * behind the original page we were given. Verify that.
4157 4157 */
4158 4158 ASSERT((pp->p_offset / bsize) >= lbn);
4159 4159
4160 4160 /*
4161 4161 * Now pp will have the list of kept dirty pages marked for
4162 4162 * write back. It will also handle invalidation and freeing
4163 4163 * of pages that are not dirty. Check for page length rounding
4164 4164 * problems.
4165 4165 */
4166 4166 if (io_off + io_len > lbn_off + bsize) {
4167 4167 ASSERT((io_off + io_len) - (lbn_off + bsize) < PAGESIZE);
4168 4168 io_len = lbn_off + bsize - io_off;
4169 4169 }
4170 4170 /*
4171 4171 * The RMODINPROGRESS flag makes sure that nfs(3)_bio() sees a
4172 4172 * consistent value of r_size. RMODINPROGRESS is set in writerp().
4173 4173 * When RMODINPROGRESS is set it indicates that a uiomove() is in
4174 4174 * progress and the r_size has not been made consistent with the
4175 4175 * new size of the file. When the uiomove() completes the r_size is
4176 4176 * updated and the RMODINPROGRESS flag is cleared.
4177 4177 *
4178 4178 * The RMODINPROGRESS flag makes sure that nfs(3)_bio() sees a
4179 4179 * consistent value of r_size. Without this handshaking, it is
4180 4180 * possible that nfs(3)_bio() picks up the old value of r_size
4181 4181 * before the uiomove() in writerp() completes. This will result
4182 4182 * in the write through nfs(3)_bio() being dropped.
4183 4183 *
4184 4184 * More precisely, there is a window between the time the uiomove()
4185 4185 * completes and the time the r_size is updated. If a VOP_PUTPAGE()
4186 4186 * operation intervenes in this window, the page will be picked up,
4187 4187 * because it is dirty (it will be unlocked, unless it was
4188 4188 * pagecreate'd). When the page is picked up as dirty, the dirty
4189 4189 * bit is reset (pvn_getdirty()). In nfs(3)write(), r_size is
4190 4190 * checked. This will still be the old size. Therefore the page will
4191 4191 * not be written out. When segmap_release() calls VOP_PUTPAGE(),
4192 4192 * the page will be found to be clean and the write will be dropped.
4193 4193 */
4194 4194 if (rp->r_flags & RMODINPROGRESS) {
4195 4195 mutex_enter(&rp->r_statelock);
4196 4196 if ((rp->r_flags & RMODINPROGRESS) &&
4197 4197 rp->r_modaddr + MAXBSIZE > io_off &&
4198 4198 rp->r_modaddr < io_off + io_len) {
4199 4199 page_t *plist;
4200 4200 /*
4201 4201 * A write is in progress for this region of the file.
4202 4202 * If we did not detect RMODINPROGRESS here then this
4203 4203 * path through nfs_putapage() would eventually go to
4204 4204 * nfs(3)_bio() and may not write out all of the data
4205 4205 * in the pages. We end up losing data. So we decide
4206 4206 * to set the modified bit on each page in the page
4207 4207 * list and mark the rnode with RDIRTY. This write
4208 4208 * will be restarted at some later time.
4209 4209 */
4210 4210 plist = pp;
4211 4211 while (plist != NULL) {
4212 4212 pp = plist;
4213 4213 page_sub(&plist, pp);
4214 4214 hat_setmod(pp);
4215 4215 page_io_unlock(pp);
4216 4216 page_unlock(pp);
4217 4217 }
4218 4218 rp->r_flags |= RDIRTY;
4219 4219 mutex_exit(&rp->r_statelock);
4220 4220 if (offp)
4221 4221 *offp = io_off;
4222 4222 if (lenp)
4223 4223 *lenp = io_len;
4224 4224 return (0);
4225 4225 }
4226 4226 mutex_exit(&rp->r_statelock);
4227 4227 }
4228 4228
4229 4229 if (flags & B_ASYNC) {
4230 4230 error = nfs_async_putapage(vp, pp, io_off, io_len, flags, cr,
4231 4231 nfs_sync_putapage);
4232 4232 } else
4233 4233 error = nfs_sync_putapage(vp, pp, io_off, io_len, flags, cr);
4234 4234
4235 4235 if (offp)
4236 4236 *offp = io_off;
4237 4237 if (lenp)
4238 4238 *lenp = io_len;
4239 4239 return (error);
4240 4240 }
4241 4241
4242 4242 static int
4243 4243 nfs_sync_putapage(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len,
4244 4244 int flags, cred_t *cr)
4245 4245 {
4246 4246 int error;
4247 4247 rnode_t *rp;
4248 4248
4249 4249 flags |= B_WRITE;
4250 4250
4251 4251 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
4252 4252 error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr);
4253 4253
4254 4254 rp = VTOR(vp);
4255 4255
4256 4256 if ((error == ENOSPC || error == EDQUOT || error == EACCES) &&
4257 4257 (flags & (B_INVAL|B_FORCE)) != (B_INVAL|B_FORCE)) {
4258 4258 if (!(rp->r_flags & ROUTOFSPACE)) {
4259 4259 mutex_enter(&rp->r_statelock);
4260 4260 rp->r_flags |= ROUTOFSPACE;
4261 4261 mutex_exit(&rp->r_statelock);
4262 4262 }
4263 4263 flags |= B_ERROR;
4264 4264 pvn_write_done(pp, flags);
4265 4265 /*
4266 4266 * If this was not an async thread, then try again to
4267 4267 * write out the pages, but this time, also destroy
4268 4268 * them whether or not the write is successful. This
4269 4269 * will prevent memory from filling up with these
4270 4270 * pages and destroying them is the only alternative
4271 4271 * if they can't be written out.
4272 4272 *
4273 4273 * Don't do this if this is an async thread because
4274 4274 * when the pages are unlocked in pvn_write_done,
4275 4275 * some other thread could have come along, locked
4276 4276 * them, and queued for an async thread. It would be
4277 4277 * possible for all of the async threads to be tied
4278 4278 * up waiting to lock the pages again and they would
4279 4279 * all already be locked and waiting for an async
4280 4280 * thread to handle them. Deadlock.
4281 4281 */
4282 4282 if (!(flags & B_ASYNC)) {
4283 4283 error = nfs_putpage(vp, io_off, io_len,
4284 4284 B_INVAL | B_FORCE, cr, NULL);
4285 4285 }
4286 4286 } else {
4287 4287 if (error)
4288 4288 flags |= B_ERROR;
4289 4289 else if (rp->r_flags & ROUTOFSPACE) {
4290 4290 mutex_enter(&rp->r_statelock);
4291 4291 rp->r_flags &= ~ROUTOFSPACE;
4292 4292 mutex_exit(&rp->r_statelock);
4293 4293 }
4294 4294 pvn_write_done(pp, flags);
4295 4295 }
4296 4296
4297 4297 return (error);
4298 4298 }
4299 4299
4300 4300 /* ARGSUSED */
4301 4301 static int
4302 4302 nfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp,
4303 4303 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4304 4304 caller_context_t *ct)
4305 4305 {
4306 4306 struct segvn_crargs vn_a;
4307 4307 int error;
4308 4308 rnode_t *rp;
4309 4309 struct vattr va;
4310 4310
4311 4311 if (nfs_zone() != VTOMI(vp)->mi_zone)
4312 4312 return (EIO);
4313 4313
4314 4314 if (vp->v_flag & VNOMAP)
4315 4315 return (ENOSYS);
4316 4316
4317 4317 if (off > MAXOFF32_T)
4318 4318 return (EFBIG);
4319 4319
4320 4320 if (off < 0 || off + len < 0)
4321 4321 return (ENXIO);
4322 4322
4323 4323 if (vp->v_type != VREG)
4324 4324 return (ENODEV);
4325 4325
4326 4326 /*
4327 4327 * If there is cached data and if close-to-open consistency
4328 4328 * checking is not turned off and if the file system is not
4329 4329 * mounted readonly, then force an over the wire getattr.
4330 4330 * Otherwise, just invoke nfsgetattr to get a copy of the
4331 4331 * attributes. The attribute cache will be used unless it
4332 4332 * is timed out and if it is, then an over the wire getattr
4333 4333 * will be issued.
4334 4334 */
4335 4335 va.va_mask = AT_ALL;
4336 4336 if (vn_has_cached_data(vp) &&
4337 4337 !(VTOMI(vp)->mi_flags & MI_NOCTO) && !vn_is_readonly(vp))
4338 4338 error = nfs_getattr_otw(vp, &va, cr);
4339 4339 else
4340 4340 error = nfsgetattr(vp, &va, cr);
4341 4341 if (error)
4342 4342 return (error);
4343 4343
4344 4344 /*
4345 4345 * Check to see if the vnode is currently marked as not cachable.
4346 4346 * This means portions of the file are locked (through VOP_FRLOCK).
4347 4347 * In this case the map request must be refused. We use
4348 4348 * rp->r_lkserlock to avoid a race with concurrent lock requests.
4349 4349 */
4350 4350 rp = VTOR(vp);
4351 4351
4352 4352 /*
4353 4353 * Atomically increment r_inmap after acquiring r_rwlock. The
4354 4354 * idea here is to acquire r_rwlock to block read/write and
4355 4355 * not to protect r_inmap. r_inmap will inform nfs_read/write()
4356 4356 * that we are in nfs_map(). Now, r_rwlock is acquired in order
4357 4357 * and we can prevent the deadlock that would have occurred
4358 4358 * when nfs_addmap() would have acquired it out of order.
4359 4359 *
4360 4360 * Since we are not protecting r_inmap by any lock, we do not
4361 4361 * hold any lock when we decrement it. We atomically decrement
4362 4362 * r_inmap after we release r_lkserlock.
4363 4363 */
4364 4364
4365 4365 if (nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER, INTR(vp)))
4366 4366 return (EINTR);
4367 4367 atomic_inc_uint(&rp->r_inmap);
4368 4368 nfs_rw_exit(&rp->r_rwlock);
4369 4369
4370 4370 if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_READER, INTR(vp))) {
4371 4371 atomic_dec_uint(&rp->r_inmap);
4372 4372 return (EINTR);
4373 4373 }
4374 4374 if (vp->v_flag & VNOCACHE) {
4375 4375 error = EAGAIN;
4376 4376 goto done;
4377 4377 }
4378 4378
4379 4379 /*
4380 4380 * Don't allow concurrent locks and mapping if mandatory locking is
4381 4381 * enabled.
4382 4382 */
4383 4383 if ((flk_has_remote_locks(vp) || lm_has_sleep(vp)) &&
4384 4384 MANDLOCK(vp, va.va_mode)) {
4385 4385 error = EAGAIN;
4386 4386 goto done;
4387 4387 }
4388 4388
4389 4389 as_rangelock(as);
4390 4390 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
4391 4391 if (error != 0) {
4392 4392 as_rangeunlock(as);
4393 4393 goto done;
4394 4394 }
4395 4395
4396 4396 vn_a.vp = vp;
4397 4397 vn_a.offset = off;
4398 4398 vn_a.type = (flags & MAP_TYPE);
4399 4399 vn_a.prot = (uchar_t)prot;
4400 4400 vn_a.maxprot = (uchar_t)maxprot;
4401 4401 vn_a.flags = (flags & ~MAP_TYPE);
4402 4402 vn_a.cred = cr;
4403 4403 vn_a.amp = NULL;
4404 4404 vn_a.szc = 0;
4405 4405 vn_a.lgrp_mem_policy_flags = 0;
4406 4406
4407 4407 error = as_map(as, *addrp, len, segvn_create, &vn_a);
4408 4408 as_rangeunlock(as);
4409 4409
4410 4410 done:
4411 4411 nfs_rw_exit(&rp->r_lkserlock);
4412 4412 atomic_dec_uint(&rp->r_inmap);
4413 4413 return (error);
4414 4414 }
4415 4415
4416 4416 /* ARGSUSED */
4417 4417 static int
4418 4418 nfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4419 4419 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4420 4420 caller_context_t *ct)
4421 4421 {
4422 4422 rnode_t *rp;
4423 4423
4424 4424 if (vp->v_flag & VNOMAP)
4425 4425 return (ENOSYS);
4426 4426 if (nfs_zone() != VTOMI(vp)->mi_zone)
4427 4427 return (EIO);
4428 4428
4429 4429 rp = VTOR(vp);
4430 4430 atomic_add_long((ulong_t *)&rp->r_mapcnt, btopr(len));
4431 4431
4432 4432 return (0);
4433 4433 }
4434 4434
4435 4435 /* ARGSUSED */
4436 4436 static int
4437 4437 nfs_frlock(vnode_t *vp, int cmd, struct flock64 *bfp, int flag, offset_t offset,
4438 4438 struct flk_callback *flk_cbp, cred_t *cr, caller_context_t *ct)
4439 4439 {
4440 4440 netobj lm_fh;
4441 4441 int rc;
4442 4442 u_offset_t start, end;
4443 4443 rnode_t *rp;
4444 4444 int error = 0, intr = INTR(vp);
4445 4445
4446 4446 /* check for valid cmd parameter */
4447 4447 if (cmd != F_GETLK && cmd != F_SETLK && cmd != F_SETLKW)
4448 4448 return (EINVAL);
4449 4449 if (nfs_zone() != VTOMI(vp)->mi_zone)
4450 4450 return (EIO);
4451 4451
4452 4452 /* Verify l_type. */
4453 4453 switch (bfp->l_type) {
4454 4454 case F_RDLCK:
4455 4455 if (cmd != F_GETLK && !(flag & FREAD))
4456 4456 return (EBADF);
4457 4457 break;
4458 4458 case F_WRLCK:
4459 4459 if (cmd != F_GETLK && !(flag & FWRITE))
4460 4460 return (EBADF);
4461 4461 break;
4462 4462 case F_UNLCK:
4463 4463 intr = 0;
4464 4464 break;
4465 4465
4466 4466 default:
4467 4467 return (EINVAL);
4468 4468 }
4469 4469
4470 4470 /* check the validity of the lock range */
4471 4471 if (rc = flk_convert_lock_data(vp, bfp, &start, &end, offset))
4472 4472 return (rc);
4473 4473 if (rc = flk_check_lock_data(start, end, MAXOFF32_T))
4474 4474 return (rc);
4475 4475
4476 4476 /*
4477 4477 * If the filesystem is mounted using local locking, pass the
4478 4478 * request off to the local locking code.
4479 4479 */
4480 4480 if (VTOMI(vp)->mi_flags & MI_LLOCK) {
4481 4481 if (offset > MAXOFF32_T)
4482 4482 return (EFBIG);
4483 4483 if (cmd == F_SETLK || cmd == F_SETLKW) {
4484 4484 /*
4485 4485 * For complete safety, we should be holding
4486 4486 * r_lkserlock. However, we can't call
4487 4487 * lm_safelock and then fs_frlock while
4488 4488 * holding r_lkserlock, so just invoke
4489 4489 * lm_safelock and expect that this will
4490 4490 * catch enough of the cases.
4491 4491 */
4492 4492 if (!lm_safelock(vp, bfp, cr))
4493 4493 return (EAGAIN);
4494 4494 }
4495 4495 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct));
4496 4496 }
4497 4497
4498 4498 rp = VTOR(vp);
4499 4499
4500 4500 /*
4501 4501 * Check whether the given lock request can proceed, given the
4502 4502 * current file mappings.
4503 4503 */
4504 4504 if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_WRITER, intr))
4505 4505 return (EINTR);
4506 4506 if (cmd == F_SETLK || cmd == F_SETLKW) {
4507 4507 if (!lm_safelock(vp, bfp, cr)) {
4508 4508 rc = EAGAIN;
4509 4509 goto done;
4510 4510 }
4511 4511 }
4512 4512
4513 4513 /*
4514 4514 * Flush the cache after waiting for async I/O to finish. For new
4515 4515 * locks, this is so that the process gets the latest bits from the
4516 4516 * server. For unlocks, this is so that other clients see the
4517 4517 * latest bits once the file has been unlocked. If currently dirty
4518 4518 * pages can't be flushed, then don't allow a lock to be set. But
4519 4519 * allow unlocks to succeed, to avoid having orphan locks on the
4520 4520 * server.
4521 4521 */
4522 4522 if (cmd != F_GETLK) {
4523 4523 mutex_enter(&rp->r_statelock);
4524 4524 while (rp->r_count > 0) {
4525 4525 if (intr) {
4526 4526 klwp_t *lwp = ttolwp(curthread);
4527 4527
4528 4528 if (lwp != NULL)
4529 4529 lwp->lwp_nostop++;
4530 4530 if (cv_wait_sig(&rp->r_cv, &rp->r_statelock)
4531 4531 == 0) {
4532 4532 if (lwp != NULL)
4533 4533 lwp->lwp_nostop--;
4534 4534 rc = EINTR;
4535 4535 break;
4536 4536 }
4537 4537 if (lwp != NULL)
4538 4538 lwp->lwp_nostop--;
4539 4539 } else
4540 4540 cv_wait(&rp->r_cv, &rp->r_statelock);
4541 4541 }
4542 4542 mutex_exit(&rp->r_statelock);
4543 4543 if (rc != 0)
4544 4544 goto done;
4545 4545 error = nfs_putpage(vp, (offset_t)0, 0, B_INVAL, cr, ct);
4546 4546 if (error) {
4547 4547 if (error == ENOSPC || error == EDQUOT) {
4548 4548 mutex_enter(&rp->r_statelock);
4549 4549 if (!rp->r_error)
4550 4550 rp->r_error = error;
4551 4551 mutex_exit(&rp->r_statelock);
4552 4552 }
4553 4553 if (bfp->l_type != F_UNLCK) {
4554 4554 rc = ENOLCK;
4555 4555 goto done;
4556 4556 }
4557 4557 }
4558 4558 }
4559 4559
4560 4560 lm_fh.n_len = sizeof (fhandle_t);
4561 4561 lm_fh.n_bytes = (char *)VTOFH(vp);
4562 4562
4563 4563 /*
4564 4564 * Call the lock manager to do the real work of contacting
4565 4565 * the server and obtaining the lock.
4566 4566 */
4567 4567 rc = lm_frlock(vp, cmd, bfp, flag, offset, cr, &lm_fh, flk_cbp);
4568 4568
4569 4569 if (rc == 0)
4570 4570 nfs_lockcompletion(vp, cmd);
4571 4571
4572 4572 done:
4573 4573 nfs_rw_exit(&rp->r_lkserlock);
4574 4574 return (rc);
4575 4575 }
4576 4576
4577 4577 /*
4578 4578 * Free storage space associated with the specified vnode. The portion
4579 4579 * to be freed is specified by bfp->l_start and bfp->l_len (already
4580 4580 * normalized to a "whence" of 0).
4581 4581 *
4582 4582 * This is an experimental facility whose continued existence is not
4583 4583 * guaranteed. Currently, we only support the special case
4584 4584 * of l_len == 0, meaning free to end of file.
4585 4585 */
4586 4586 /* ARGSUSED */
4587 4587 static int
4588 4588 nfs_space(vnode_t *vp, int cmd, struct flock64 *bfp, int flag,
4589 4589 offset_t offset, cred_t *cr, caller_context_t *ct)
4590 4590 {
4591 4591 int error;
4592 4592
4593 4593 ASSERT(vp->v_type == VREG);
4594 4594 if (cmd != F_FREESP)
4595 4595 return (EINVAL);
4596 4596
4597 4597 if (offset > MAXOFF32_T)
4598 4598 return (EFBIG);
4599 4599
4600 4600 if ((bfp->l_start > MAXOFF32_T) || (bfp->l_end > MAXOFF32_T) ||
4601 4601 (bfp->l_len > MAXOFF32_T))
4602 4602 return (EFBIG);
4603 4603
4604 4604 if (nfs_zone() != VTOMI(vp)->mi_zone)
4605 4605 return (EIO);
4606 4606
4607 4607 error = convoff(vp, bfp, 0, offset);
4608 4608 if (!error) {
4609 4609 ASSERT(bfp->l_start >= 0);
4610 4610 if (bfp->l_len == 0) {
4611 4611 struct vattr va;
4612 4612
4613 4613 /*
4614 4614 * ftruncate should not change the ctime and
4615 4615 * mtime if we truncate the file to its
4616 4616 * previous size.
4617 4617 */
4618 4618 va.va_mask = AT_SIZE;
4619 4619 error = nfsgetattr(vp, &va, cr);
4620 4620 if (error || va.va_size == bfp->l_start)
4621 4621 return (error);
4622 4622 va.va_mask = AT_SIZE;
4623 4623 va.va_size = bfp->l_start;
4624 4624 error = nfssetattr(vp, &va, 0, cr);
4625 4625
4626 4626 if (error == 0) {
4627 4627 if (bfp->l_start == 0) {
4628 4628 vnevent_truncate(vp, ct);
4629 4629 } else {
4630 4630 vnevent_resize(vp, ct);
4631 4631 }
4632 4632 }
4633 4633 } else
4634 4634 error = EINVAL;
4635 4635 }
4636 4636
4637 4637 return (error);
4638 4638 }
4639 4639
4640 4640 /* ARGSUSED */
4641 4641 static int
4642 4642 nfs_realvp(vnode_t *vp, vnode_t **vpp, caller_context_t *ct)
4643 4643 {
4644 4644
4645 4645 return (EINVAL);
4646 4646 }
4647 4647
4648 4648 /*
4649 4649 * Setup and add an address space callback to do the work of the delmap call.
4650 4650 * The callback will (and must be) deleted in the actual callback function.
4651 4651 *
4652 4652 * This is done in order to take care of the problem that we have with holding
4653 4653 * the address space's a_lock for a long period of time (e.g. if the NFS server
4654 4654 * is down). Callbacks will be executed in the address space code while the
4655 4655 * a_lock is not held. Holding the address space's a_lock causes things such
4656 4656 * as ps and fork to hang because they are trying to acquire this lock as well.
4657 4657 */
4658 4658 /* ARGSUSED */
4659 4659 static int
4660 4660 nfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4661 4661 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr,
4662 4662 caller_context_t *ct)
4663 4663 {
4664 4664 int caller_found;
4665 4665 int error;
4666 4666 rnode_t *rp;
4667 4667 nfs_delmap_args_t *dmapp;
4668 4668 nfs_delmapcall_t *delmap_call;
4669 4669
4670 4670 if (vp->v_flag & VNOMAP)
4671 4671 return (ENOSYS);
4672 4672 /*
4673 4673 * A process may not change zones if it has NFS pages mmap'ed
4674 4674 * in, so we can't legitimately get here from the wrong zone.
4675 4675 */
4676 4676 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
4677 4677
4678 4678 rp = VTOR(vp);
4679 4679
4680 4680 /*
4681 4681 * The way that the address space of this process deletes its mapping
4682 4682 * of this file is via the following call chains:
4683 4683 * - as_free()->SEGOP_UNMAP()/segvn_unmap()->VOP_DELMAP()/nfs_delmap()
4684 4684 * - as_unmap()->SEGOP_UNMAP()/segvn_unmap()->VOP_DELMAP()/nfs_delmap()
4685 4685 *
4686 4686 * With the use of address space callbacks we are allowed to drop the
4687 4687 * address space lock, a_lock, while executing the NFS operations that
4688 4688 * need to go over the wire. Returning EAGAIN to the caller of this
4689 4689 * function is what drives the execution of the callback that we add
4690 4690 * below. The callback will be executed by the address space code
4691 4691 * after dropping the a_lock. When the callback is finished, since
4692 4692 * we dropped the a_lock, it must be re-acquired and segvn_unmap()
4693 4693 * is called again on the same segment to finish the rest of the work
4694 4694 * that needs to happen during unmapping.
4695 4695 *
4696 4696 * This action of calling back into the segment driver causes
4697 4697 * nfs_delmap() to get called again, but since the callback was
4698 4698 * already executed at this point, it already did the work and there
4699 4699 * is nothing left for us to do.
4700 4700 *
4701 4701 * To Summarize:
4702 4702 * - The first time nfs_delmap is called by the current thread is when
4703 4703 * we add the caller associated with this delmap to the delmap caller
4704 4704 * list, add the callback, and return EAGAIN.
4705 4705 * - The second time in this call chain when nfs_delmap is called we
4706 4706 * will find this caller in the delmap caller list and realize there
4707 4707 * is no more work to do thus removing this caller from the list and
4708 4708 * returning the error that was set in the callback execution.
4709 4709 */
4710 4710 caller_found = nfs_find_and_delete_delmapcall(rp, &error);
4711 4711 if (caller_found) {
4712 4712 /*
4713 4713 * 'error' is from the actual delmap operations. To avoid
4714 4714 * hangs, we need to handle the return of EAGAIN differently
4715 4715 * since this is what drives the callback execution.
4716 4716 * In this case, we don't want to return EAGAIN and do the
4717 4717 * callback execution because there are none to execute.
4718 4718 */
4719 4719 if (error == EAGAIN)
4720 4720 return (0);
4721 4721 else
4722 4722 return (error);
4723 4723 }
4724 4724
4725 4725 /* current caller was not in the list */
4726 4726 delmap_call = nfs_init_delmapcall();
4727 4727
4728 4728 mutex_enter(&rp->r_statelock);
4729 4729 list_insert_tail(&rp->r_indelmap, delmap_call);
4730 4730 mutex_exit(&rp->r_statelock);
4731 4731
4732 4732 dmapp = kmem_alloc(sizeof (nfs_delmap_args_t), KM_SLEEP);
4733 4733
4734 4734 dmapp->vp = vp;
4735 4735 dmapp->off = off;
4736 4736 dmapp->addr = addr;
4737 4737 dmapp->len = len;
4738 4738 dmapp->prot = prot;
4739 4739 dmapp->maxprot = maxprot;
4740 4740 dmapp->flags = flags;
4741 4741 dmapp->cr = cr;
4742 4742 dmapp->caller = delmap_call;
4743 4743
4744 4744 error = as_add_callback(as, nfs_delmap_callback, dmapp,
4745 4745 AS_UNMAP_EVENT, addr, len, KM_SLEEP);
4746 4746
4747 4747 return (error ? error : EAGAIN);
4748 4748 }
4749 4749
4750 4750 /*
4751 4751 * Remove some pages from an mmap'd vnode. Just update the
4752 4752 * count of pages. If doing close-to-open, then flush all
4753 4753 * of the pages associated with this file. Otherwise, start
4754 4754 * an asynchronous page flush to write out any dirty pages.
4755 4755 * This will also associate a credential with the rnode which
4756 4756 * can be used to write the pages.
4757 4757 */
4758 4758 /* ARGSUSED */
4759 4759 static void
4760 4760 nfs_delmap_callback(struct as *as, void *arg, uint_t event)
4761 4761 {
4762 4762 int error;
4763 4763 rnode_t *rp;
4764 4764 mntinfo_t *mi;
4765 4765 nfs_delmap_args_t *dmapp = (nfs_delmap_args_t *)arg;
4766 4766
4767 4767 rp = VTOR(dmapp->vp);
4768 4768 mi = VTOMI(dmapp->vp);
4769 4769
4770 4770 atomic_add_long((ulong_t *)&rp->r_mapcnt, -btopr(dmapp->len));
4771 4771 ASSERT(rp->r_mapcnt >= 0);
4772 4772
4773 4773 /*
4774 4774 * Initiate a page flush if there are pages, the file system
4775 4775 * was not mounted readonly, the segment was mapped shared, and
4776 4776 * the pages themselves were writeable.
4777 4777 */
4778 4778 if (vn_has_cached_data(dmapp->vp) && !vn_is_readonly(dmapp->vp) &&
4779 4779 dmapp->flags == MAP_SHARED && (dmapp->maxprot & PROT_WRITE)) {
4780 4780 mutex_enter(&rp->r_statelock);
4781 4781 rp->r_flags |= RDIRTY;
4782 4782 mutex_exit(&rp->r_statelock);
4783 4783 /*
4784 4784 * If this is a cross-zone access a sync putpage won't work, so
4785 4785 * the best we can do is try an async putpage. That seems
4786 4786 * better than something more draconian such as discarding the
4787 4787 * dirty pages.
4788 4788 */
4789 4789 if ((mi->mi_flags & MI_NOCTO) ||
4790 4790 nfs_zone() != mi->mi_zone)
4791 4791 error = nfs_putpage(dmapp->vp, dmapp->off, dmapp->len,
4792 4792 B_ASYNC, dmapp->cr, NULL);
4793 4793 else
4794 4794 error = nfs_putpage(dmapp->vp, dmapp->off, dmapp->len,
4795 4795 0, dmapp->cr, NULL);
4796 4796 if (!error) {
4797 4797 mutex_enter(&rp->r_statelock);
4798 4798 error = rp->r_error;
4799 4799 rp->r_error = 0;
4800 4800 mutex_exit(&rp->r_statelock);
4801 4801 }
4802 4802 } else
4803 4803 error = 0;
4804 4804
4805 4805 if ((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO))
4806 4806 (void) nfs_putpage(dmapp->vp, dmapp->off, dmapp->len,
4807 4807 B_INVAL, dmapp->cr, NULL);
4808 4808
4809 4809 dmapp->caller->error = error;
4810 4810 (void) as_delete_callback(as, arg);
4811 4811 kmem_free(dmapp, sizeof (nfs_delmap_args_t));
4812 4812 }
4813 4813
4814 4814 /* ARGSUSED */
4815 4815 static int
4816 4816 nfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
4817 4817 caller_context_t *ct)
4818 4818 {
4819 4819 int error = 0;
4820 4820
4821 4821 if (nfs_zone() != VTOMI(vp)->mi_zone)
4822 4822 return (EIO);
4823 4823 /*
4824 4824 * This looks a little weird because it's written in a general
4825 4825 * manner but we make little use of cases. If cntl() ever gets
4826 4826 * widely used, the outer switch will make more sense.
4827 4827 */
4828 4828
4829 4829 switch (cmd) {
4830 4830
4831 4831 /*
4832 4832 * Large file spec - need to base answer new query with
4833 4833 * hardcoded constant based on the protocol.
4834 4834 */
4835 4835 case _PC_FILESIZEBITS:
4836 4836 *valp = 32;
4837 4837 return (0);
4838 4838
4839 4839 case _PC_LINK_MAX:
4840 4840 case _PC_NAME_MAX:
4841 4841 case _PC_PATH_MAX:
4842 4842 case _PC_SYMLINK_MAX:
4843 4843 case _PC_CHOWN_RESTRICTED:
4844 4844 case _PC_NO_TRUNC: {
4845 4845 mntinfo_t *mi;
4846 4846 struct pathcnf *pc;
4847 4847
4848 4848 if ((mi = VTOMI(vp)) == NULL || (pc = mi->mi_pathconf) == NULL)
4849 4849 return (EINVAL);
4850 4850 error = _PC_ISSET(cmd, pc->pc_mask); /* error or bool */
4851 4851 switch (cmd) {
4852 4852 case _PC_LINK_MAX:
4853 4853 *valp = pc->pc_link_max;
4854 4854 break;
4855 4855 case _PC_NAME_MAX:
4856 4856 *valp = pc->pc_name_max;
4857 4857 break;
4858 4858 case _PC_PATH_MAX:
4859 4859 case _PC_SYMLINK_MAX:
4860 4860 *valp = pc->pc_path_max;
4861 4861 break;
4862 4862 case _PC_CHOWN_RESTRICTED:
4863 4863 /*
4864 4864 * if we got here, error is really a boolean which
4865 4865 * indicates whether cmd is set or not.
4866 4866 */
4867 4867 *valp = error ? 1 : 0; /* see above */
4868 4868 error = 0;
4869 4869 break;
4870 4870 case _PC_NO_TRUNC:
4871 4871 /*
4872 4872 * if we got here, error is really a boolean which
4873 4873 * indicates whether cmd is set or not.
4874 4874 */
4875 4875 *valp = error ? 1 : 0; /* see above */
4876 4876 error = 0;
4877 4877 break;
4878 4878 }
4879 4879 return (error ? EINVAL : 0);
4880 4880 }
4881 4881
4882 4882 case _PC_XATTR_EXISTS:
4883 4883 *valp = 0;
4884 4884 if (vp->v_vfsp->vfs_flag & VFS_XATTR) {
4885 4885 vnode_t *avp;
4886 4886 rnode_t *rp;
4887 4887 mntinfo_t *mi = VTOMI(vp);
4888 4888
4889 4889 if (!(mi->mi_flags & MI_EXTATTR))
4890 4890 return (0);
4891 4891
4892 4892 rp = VTOR(vp);
4893 4893 if (nfs_rw_enter_sig(&rp->r_rwlock, RW_READER,
4894 4894 INTR(vp)))
4895 4895 return (EINTR);
4896 4896
4897 4897 error = nfslookup_dnlc(vp, XATTR_DIR_NAME, &avp, cr);
4898 4898 if (error || avp == NULL)
4899 4899 error = acl_getxattrdir2(vp, &avp, 0, cr, 0);
4900 4900
4901 4901 nfs_rw_exit(&rp->r_rwlock);
4902 4902
4903 4903 if (error == 0 && avp != NULL) {
4904 4904 error = do_xattr_exists_check(avp, valp, cr);
4905 4905 VN_RELE(avp);
4906 4906 }
4907 4907 }
4908 4908 return (error ? EINVAL : 0);
4909 4909
4910 4910 case _PC_ACL_ENABLED:
4911 4911 *valp = _ACL_ACLENT_ENABLED;
4912 4912 return (0);
4913 4913
4914 4914 default:
4915 4915 return (EINVAL);
4916 4916 }
4917 4917 }
4918 4918
4919 4919 /*
4920 4920 * Called by async thread to do synchronous pageio. Do the i/o, wait
4921 4921 * for it to complete, and cleanup the page list when done.
4922 4922 */
4923 4923 static int
4924 4924 nfs_sync_pageio(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len,
4925 4925 int flags, cred_t *cr)
4926 4926 {
4927 4927 int error;
4928 4928
4929 4929 ASSERT(nfs_zone() == VTOMI(vp)->mi_zone);
4930 4930 error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr);
4931 4931 if (flags & B_READ)
4932 4932 pvn_read_done(pp, (error ? B_ERROR : 0) | flags);
4933 4933 else
4934 4934 pvn_write_done(pp, (error ? B_ERROR : 0) | flags);
4935 4935 return (error);
4936 4936 }
4937 4937
4938 4938 /* ARGSUSED */
4939 4939 static int
4940 4940 nfs_pageio(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len,
4941 4941 int flags, cred_t *cr, caller_context_t *ct)
4942 4942 {
4943 4943 int error;
4944 4944 rnode_t *rp;
4945 4945
4946 4946 if (pp == NULL)
4947 4947 return (EINVAL);
4948 4948
4949 4949 if (io_off > MAXOFF32_T)
4950 4950 return (EFBIG);
4951 4951 if (nfs_zone() != VTOMI(vp)->mi_zone)
4952 4952 return (EIO);
4953 4953 rp = VTOR(vp);
4954 4954 mutex_enter(&rp->r_statelock);
4955 4955 rp->r_count++;
4956 4956 mutex_exit(&rp->r_statelock);
4957 4957
4958 4958 if (flags & B_ASYNC) {
4959 4959 error = nfs_async_pageio(vp, pp, io_off, io_len, flags, cr,
4960 4960 nfs_sync_pageio);
4961 4961 } else
4962 4962 error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr);
4963 4963 mutex_enter(&rp->r_statelock);
4964 4964 rp->r_count--;
4965 4965 cv_broadcast(&rp->r_cv);
4966 4966 mutex_exit(&rp->r_statelock);
4967 4967 return (error);
4968 4968 }
4969 4969
4970 4970 /* ARGSUSED */
4971 4971 static int
4972 4972 nfs_setsecattr(vnode_t *vp, vsecattr_t *vsecattr, int flag, cred_t *cr,
4973 4973 caller_context_t *ct)
4974 4974 {
4975 4975 int error;
4976 4976 mntinfo_t *mi;
4977 4977
4978 4978 mi = VTOMI(vp);
4979 4979
4980 4980 if (nfs_zone() != mi->mi_zone)
4981 4981 return (EIO);
4982 4982 if (mi->mi_flags & MI_ACL) {
4983 4983 error = acl_setacl2(vp, vsecattr, flag, cr);
4984 4984 if (mi->mi_flags & MI_ACL)
4985 4985 return (error);
4986 4986 }
4987 4987
4988 4988 return (ENOSYS);
4989 4989 }
4990 4990
4991 4991 /* ARGSUSED */
4992 4992 static int
4993 4993 nfs_getsecattr(vnode_t *vp, vsecattr_t *vsecattr, int flag, cred_t *cr,
4994 4994 caller_context_t *ct)
4995 4995 {
4996 4996 int error;
4997 4997 mntinfo_t *mi;
4998 4998
4999 4999 mi = VTOMI(vp);
5000 5000
5001 5001 if (nfs_zone() != mi->mi_zone)
5002 5002 return (EIO);
5003 5003 if (mi->mi_flags & MI_ACL) {
5004 5004 error = acl_getacl2(vp, vsecattr, flag, cr);
5005 5005 if (mi->mi_flags & MI_ACL)
5006 5006 return (error);
5007 5007 }
5008 5008
5009 5009 return (fs_fab_acl(vp, vsecattr, flag, cr, ct));
5010 5010 }
5011 5011
5012 5012 /* ARGSUSED */
5013 5013 static int
5014 5014 nfs_shrlock(vnode_t *vp, int cmd, struct shrlock *shr, int flag, cred_t *cr,
5015 5015 caller_context_t *ct)
5016 5016 {
5017 5017 int error;
5018 5018 struct shrlock nshr;
5019 5019 struct nfs_owner nfs_owner;
5020 5020 netobj lm_fh;
5021 5021
5022 5022 if (nfs_zone() != VTOMI(vp)->mi_zone)
5023 5023 return (EIO);
5024 5024
5025 5025 /*
5026 5026 * check for valid cmd parameter
5027 5027 */
5028 5028 if (cmd != F_SHARE && cmd != F_UNSHARE && cmd != F_HASREMOTELOCKS)
5029 5029 return (EINVAL);
5030 5030
5031 5031 /*
5032 5032 * Check access permissions
5033 5033 */
5034 5034 if (cmd == F_SHARE &&
5035 5035 (((shr->s_access & F_RDACC) && !(flag & FREAD)) ||
5036 5036 ((shr->s_access & F_WRACC) && !(flag & FWRITE))))
5037 5037 return (EBADF);
5038 5038
5039 5039 /*
5040 5040 * If the filesystem is mounted using local locking, pass the
5041 5041 * request off to the local share code.
5042 5042 */
5043 5043 if (VTOMI(vp)->mi_flags & MI_LLOCK)
5044 5044 return (fs_shrlock(vp, cmd, shr, flag, cr, ct));
5045 5045
5046 5046 switch (cmd) {
5047 5047 case F_SHARE:
5048 5048 case F_UNSHARE:
5049 5049 lm_fh.n_len = sizeof (fhandle_t);
5050 5050 lm_fh.n_bytes = (char *)VTOFH(vp);
5051 5051
5052 5052 /*
5053 5053 * If passed an owner that is too large to fit in an
5054 5054 * nfs_owner it is likely a recursive call from the
5055 5055 * lock manager client and pass it straight through. If
5056 5056 * it is not a nfs_owner then simply return an error.
5057 5057 */
5058 5058 if (shr->s_own_len > sizeof (nfs_owner.lowner)) {
5059 5059 if (((struct nfs_owner *)shr->s_owner)->magic !=
5060 5060 NFS_OWNER_MAGIC)
5061 5061 return (EINVAL);
5062 5062
5063 5063 if (error = lm_shrlock(vp, cmd, shr, flag, &lm_fh)) {
5064 5064 error = set_errno(error);
5065 5065 }
5066 5066 return (error);
5067 5067 }
5068 5068 /*
5069 5069 * Remote share reservations owner is a combination of
5070 5070 * a magic number, hostname, and the local owner
5071 5071 */
5072 5072 bzero(&nfs_owner, sizeof (nfs_owner));
5073 5073 nfs_owner.magic = NFS_OWNER_MAGIC;
5074 5074 (void) strncpy(nfs_owner.hname, uts_nodename(),
5075 5075 sizeof (nfs_owner.hname));
5076 5076 bcopy(shr->s_owner, nfs_owner.lowner, shr->s_own_len);
5077 5077 nshr.s_access = shr->s_access;
5078 5078 nshr.s_deny = shr->s_deny;
5079 5079 nshr.s_sysid = 0;
5080 5080 nshr.s_pid = ttoproc(curthread)->p_pid;
5081 5081 nshr.s_own_len = sizeof (nfs_owner);
5082 5082 nshr.s_owner = (caddr_t)&nfs_owner;
5083 5083
5084 5084 if (error = lm_shrlock(vp, cmd, &nshr, flag, &lm_fh)) {
5085 5085 error = set_errno(error);
5086 5086 }
5087 5087
5088 5088 break;
5089 5089
5090 5090 case F_HASREMOTELOCKS:
5091 5091 /*
5092 5092 * NFS client can't store remote locks itself
5093 5093 */
5094 5094 shr->s_access = 0;
5095 5095 error = 0;
5096 5096 break;
5097 5097
5098 5098 default:
5099 5099 error = EINVAL;
5100 5100 break;
5101 5101 }
5102 5102
5103 5103 return (error);
5104 5104 }
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