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7127 remove -Wno-missing-braces from Makefile.uts
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--- old/usr/src/uts/common/fs/specfs/specvnops.c
+++ new/usr/src/uts/common/fs/specfs/specvnops.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 2009 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 25 */
26 26
27 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 28 /* All Rights Reserved */
29 29
30 30 /*
31 31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 32 * The Regents of the University of California
33 33 * All Rights Reserved
34 34 *
35 35 * University Acknowledgment- Portions of this document are derived from
36 36 * software developed by the University of California, Berkeley, and its
37 37 * contributors.
38 38 */
39 39
40 40 #include <sys/types.h>
41 41 #include <sys/thread.h>
42 42 #include <sys/t_lock.h>
43 43 #include <sys/param.h>
44 44 #include <sys/systm.h>
45 45 #include <sys/bitmap.h>
46 46 #include <sys/buf.h>
47 47 #include <sys/cmn_err.h>
48 48 #include <sys/conf.h>
49 49 #include <sys/ddi.h>
50 50 #include <sys/debug.h>
51 51 #include <sys/dkio.h>
52 52 #include <sys/errno.h>
53 53 #include <sys/time.h>
54 54 #include <sys/fcntl.h>
55 55 #include <sys/flock.h>
56 56 #include <sys/file.h>
57 57 #include <sys/kmem.h>
58 58 #include <sys/mman.h>
59 59 #include <sys/open.h>
60 60 #include <sys/swap.h>
61 61 #include <sys/sysmacros.h>
62 62 #include <sys/uio.h>
63 63 #include <sys/vfs.h>
64 64 #include <sys/vfs_opreg.h>
65 65 #include <sys/vnode.h>
66 66 #include <sys/stat.h>
67 67 #include <sys/poll.h>
68 68 #include <sys/stream.h>
69 69 #include <sys/strsubr.h>
70 70 #include <sys/policy.h>
71 71 #include <sys/devpolicy.h>
72 72
73 73 #include <sys/proc.h>
74 74 #include <sys/user.h>
75 75 #include <sys/session.h>
76 76 #include <sys/vmsystm.h>
77 77 #include <sys/vtrace.h>
78 78 #include <sys/pathname.h>
79 79
80 80 #include <sys/fs/snode.h>
81 81
82 82 #include <vm/seg.h>
83 83 #include <vm/seg_map.h>
84 84 #include <vm/page.h>
85 85 #include <vm/pvn.h>
86 86 #include <vm/seg_dev.h>
87 87 #include <vm/seg_vn.h>
88 88
89 89 #include <fs/fs_subr.h>
90 90
91 91 #include <sys/esunddi.h>
92 92 #include <sys/autoconf.h>
93 93 #include <sys/sunndi.h>
94 94 #include <sys/contract/device_impl.h>
95 95
96 96
97 97 static int spec_open(struct vnode **, int, struct cred *, caller_context_t *);
98 98 static int spec_close(struct vnode *, int, int, offset_t, struct cred *,
99 99 caller_context_t *);
100 100 static int spec_read(struct vnode *, struct uio *, int, struct cred *,
101 101 caller_context_t *);
102 102 static int spec_write(struct vnode *, struct uio *, int, struct cred *,
103 103 caller_context_t *);
104 104 static int spec_ioctl(struct vnode *, int, intptr_t, int, struct cred *, int *,
105 105 caller_context_t *);
106 106 static int spec_getattr(struct vnode *, struct vattr *, int, struct cred *,
107 107 caller_context_t *);
108 108 static int spec_setattr(struct vnode *, struct vattr *, int, struct cred *,
109 109 caller_context_t *);
110 110 static int spec_access(struct vnode *, int, int, struct cred *,
111 111 caller_context_t *);
112 112 static int spec_create(struct vnode *, char *, vattr_t *, enum vcexcl, int,
113 113 struct vnode **, struct cred *, int, caller_context_t *, vsecattr_t *);
114 114 static int spec_fsync(struct vnode *, int, struct cred *, caller_context_t *);
115 115 static void spec_inactive(struct vnode *, struct cred *, caller_context_t *);
116 116 static int spec_fid(struct vnode *, struct fid *, caller_context_t *);
117 117 static int spec_seek(struct vnode *, offset_t, offset_t *, caller_context_t *);
118 118 static int spec_frlock(struct vnode *, int, struct flock64 *, int, offset_t,
119 119 struct flk_callback *, struct cred *, caller_context_t *);
120 120 static int spec_realvp(struct vnode *, struct vnode **, caller_context_t *);
121 121
122 122 static int spec_getpage(struct vnode *, offset_t, size_t, uint_t *, page_t **,
123 123 size_t, struct seg *, caddr_t, enum seg_rw, struct cred *,
124 124 caller_context_t *);
125 125 static int spec_putapage(struct vnode *, page_t *, u_offset_t *, size_t *, int,
126 126 struct cred *);
127 127 static struct buf *spec_startio(struct vnode *, page_t *, u_offset_t, size_t,
128 128 int);
129 129 static int spec_getapage(struct vnode *, u_offset_t, size_t, uint_t *,
130 130 page_t **, size_t, struct seg *, caddr_t, enum seg_rw, struct cred *);
131 131 static int spec_map(struct vnode *, offset_t, struct as *, caddr_t *, size_t,
132 132 uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *);
133 133 static int spec_addmap(struct vnode *, offset_t, struct as *, caddr_t, size_t,
134 134 uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *);
135 135 static int spec_delmap(struct vnode *, offset_t, struct as *, caddr_t, size_t,
136 136 uint_t, uint_t, uint_t, struct cred *, caller_context_t *);
137 137
138 138 static int spec_poll(struct vnode *, short, int, short *, struct pollhead **,
139 139 caller_context_t *);
140 140 static int spec_dump(struct vnode *, caddr_t, offset_t, offset_t,
141 141 caller_context_t *);
142 142 static int spec_pageio(struct vnode *, page_t *, u_offset_t, size_t, int,
143 143 cred_t *, caller_context_t *);
144 144
145 145 static int spec_getsecattr(struct vnode *, vsecattr_t *, int, struct cred *,
146 146 caller_context_t *);
147 147 static int spec_setsecattr(struct vnode *, vsecattr_t *, int, struct cred *,
148 148 caller_context_t *);
149 149 static int spec_pathconf(struct vnode *, int, ulong_t *, struct cred *,
150 150 caller_context_t *);
151 151
152 152 #define SN_HOLD(csp) { \
153 153 mutex_enter(&csp->s_lock); \
154 154 csp->s_count++; \
155 155 mutex_exit(&csp->s_lock); \
156 156 }
157 157
158 158 #define SN_RELE(csp) { \
159 159 mutex_enter(&csp->s_lock); \
160 160 csp->s_count--; \
161 161 ASSERT((csp->s_count > 0) || (csp->s_vnode->v_stream == NULL)); \
162 162 mutex_exit(&csp->s_lock); \
163 163 }
164 164
165 165 #define S_ISFENCED(sp) ((VTOS((sp)->s_commonvp))->s_flag & SFENCED)
166 166
167 167 struct vnodeops *spec_vnodeops;
168 168
169 169 /*
170 170 * *PLEASE NOTE*: If you add new entry points to specfs, do
171 171 * not forget to add support for fencing. A fenced snode
172 172 * is indicated by the SFENCED flag in the common snode.
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173 173 * If a snode is fenced, determine if your entry point is
174 174 * a configuration operation (Example: open), a detection
175 175 * operation (Example: gettattr), an I/O operation (Example: ioctl())
176 176 * or an unconfiguration operation (Example: close). If it is
177 177 * a configuration or detection operation, fail the operation
178 178 * for a fenced snode with an ENXIO or EIO as appropriate. If
179 179 * it is any other operation, let it through.
180 180 */
181 181
182 182 const fs_operation_def_t spec_vnodeops_template[] = {
183 - VOPNAME_OPEN, { .vop_open = spec_open },
184 - VOPNAME_CLOSE, { .vop_close = spec_close },
185 - VOPNAME_READ, { .vop_read = spec_read },
186 - VOPNAME_WRITE, { .vop_write = spec_write },
187 - VOPNAME_IOCTL, { .vop_ioctl = spec_ioctl },
188 - VOPNAME_GETATTR, { .vop_getattr = spec_getattr },
189 - VOPNAME_SETATTR, { .vop_setattr = spec_setattr },
190 - VOPNAME_ACCESS, { .vop_access = spec_access },
191 - VOPNAME_CREATE, { .vop_create = spec_create },
192 - VOPNAME_FSYNC, { .vop_fsync = spec_fsync },
193 - VOPNAME_INACTIVE, { .vop_inactive = spec_inactive },
194 - VOPNAME_FID, { .vop_fid = spec_fid },
195 - VOPNAME_SEEK, { .vop_seek = spec_seek },
196 - VOPNAME_PATHCONF, { .vop_pathconf = spec_pathconf },
197 - VOPNAME_FRLOCK, { .vop_frlock = spec_frlock },
198 - VOPNAME_REALVP, { .vop_realvp = spec_realvp },
199 - VOPNAME_GETPAGE, { .vop_getpage = spec_getpage },
200 - VOPNAME_PUTPAGE, { .vop_putpage = spec_putpage },
201 - VOPNAME_MAP, { .vop_map = spec_map },
202 - VOPNAME_ADDMAP, { .vop_addmap = spec_addmap },
203 - VOPNAME_DELMAP, { .vop_delmap = spec_delmap },
204 - VOPNAME_POLL, { .vop_poll = spec_poll },
205 - VOPNAME_DUMP, { .vop_dump = spec_dump },
206 - VOPNAME_PAGEIO, { .vop_pageio = spec_pageio },
207 - VOPNAME_SETSECATTR, { .vop_setsecattr = spec_setsecattr },
208 - VOPNAME_GETSECATTR, { .vop_getsecattr = spec_getsecattr },
209 - NULL, NULL
183 + { VOPNAME_OPEN, { .vop_open = spec_open } },
184 + { VOPNAME_CLOSE, { .vop_close = spec_close } },
185 + { VOPNAME_READ, { .vop_read = spec_read } },
186 + { VOPNAME_WRITE, { .vop_write = spec_write } },
187 + { VOPNAME_IOCTL, { .vop_ioctl = spec_ioctl } },
188 + { VOPNAME_GETATTR, { .vop_getattr = spec_getattr } },
189 + { VOPNAME_SETATTR, { .vop_setattr = spec_setattr } },
190 + { VOPNAME_ACCESS, { .vop_access = spec_access } },
191 + { VOPNAME_CREATE, { .vop_create = spec_create } },
192 + { VOPNAME_FSYNC, { .vop_fsync = spec_fsync } },
193 + { VOPNAME_INACTIVE, { .vop_inactive = spec_inactive } },
194 + { VOPNAME_FID, { .vop_fid = spec_fid } },
195 + { VOPNAME_SEEK, { .vop_seek = spec_seek } },
196 + { VOPNAME_PATHCONF, { .vop_pathconf = spec_pathconf } },
197 + { VOPNAME_FRLOCK, { .vop_frlock = spec_frlock } },
198 + { VOPNAME_REALVP, { .vop_realvp = spec_realvp } },
199 + { VOPNAME_GETPAGE, { .vop_getpage = spec_getpage } },
200 + { VOPNAME_PUTPAGE, { .vop_putpage = spec_putpage } },
201 + { VOPNAME_MAP, { .vop_map = spec_map } },
202 + { VOPNAME_ADDMAP, { .vop_addmap = spec_addmap } },
203 + { VOPNAME_DELMAP, { .vop_delmap = spec_delmap } },
204 + { VOPNAME_POLL, { .vop_poll = spec_poll } },
205 + { VOPNAME_DUMP, { .vop_dump = spec_dump } },
206 + { VOPNAME_PAGEIO, { .vop_pageio = spec_pageio } },
207 + { VOPNAME_SETSECATTR, { .vop_setsecattr = spec_setsecattr } },
208 + { VOPNAME_GETSECATTR, { .vop_getsecattr = spec_getsecattr } },
209 + { NULL, { NULL } }
210 210 };
211 211
212 212 /*
213 213 * Return address of spec_vnodeops
214 214 */
215 215 struct vnodeops *
216 216 spec_getvnodeops(void)
217 217 {
218 218 return (spec_vnodeops);
219 219 }
220 220
221 221 extern vnode_t *rconsvp;
222 222
223 223 /*
224 224 * Acquire the serial lock on the common snode.
225 225 */
226 226 #define LOCK_CSP(csp) (void) spec_lockcsp(csp, 0, 1, 0)
227 227 #define LOCKHOLD_CSP_SIG(csp) spec_lockcsp(csp, 1, 1, 1)
228 228 #define SYNCHOLD_CSP_SIG(csp, intr) spec_lockcsp(csp, intr, 0, 1)
229 229
230 230 typedef enum {
231 231 LOOP,
232 232 INTR,
233 233 SUCCESS
234 234 } slock_ret_t;
235 235
236 236 /*
237 237 * Synchronize with active SLOCKED snode, optionally checking for a signal and
238 238 * optionally returning with SLOCKED set and SN_HOLD done. The 'intr'
239 239 * argument determines if the thread is interruptible by a signal while
240 240 * waiting, the function returns INTR if interrupted while there is another
241 241 * thread closing this snonde and LOOP if interrupted otherwise.
242 242 * When SUCCESS is returned the 'hold' argument determines if the open
243 243 * count (SN_HOLD) has been incremented and the 'setlock' argument
244 244 * determines if the function returns with SLOCKED set.
245 245 */
246 246 static slock_ret_t
247 247 spec_lockcsp(struct snode *csp, int intr, int setlock, int hold)
248 248 {
249 249 slock_ret_t ret = SUCCESS;
250 250 mutex_enter(&csp->s_lock);
251 251 while (csp->s_flag & SLOCKED) {
252 252 csp->s_flag |= SWANT;
253 253 if (intr) {
254 254 if (!cv_wait_sig(&csp->s_cv, &csp->s_lock)) {
255 255 if (csp->s_flag & SCLOSING)
256 256 ret = INTR;
257 257 else
258 258 ret = LOOP;
259 259 mutex_exit(&csp->s_lock);
260 260 return (ret); /* interrupted */
261 261 }
262 262 } else {
263 263 cv_wait(&csp->s_cv, &csp->s_lock);
264 264 }
265 265 }
266 266 if (setlock)
267 267 csp->s_flag |= SLOCKED;
268 268 if (hold)
269 269 csp->s_count++; /* one more open reference : SN_HOLD */
270 270 mutex_exit(&csp->s_lock);
271 271 return (ret); /* serialized/locked */
272 272 }
273 273
274 274 /*
275 275 * Unlock the serial lock on the common snode
276 276 */
277 277 #define UNLOCK_CSP_LOCK_HELD(csp) \
278 278 ASSERT(mutex_owned(&csp->s_lock)); \
279 279 if (csp->s_flag & SWANT) \
280 280 cv_broadcast(&csp->s_cv); \
281 281 csp->s_flag &= ~(SWANT|SLOCKED);
282 282
283 283 #define UNLOCK_CSP(csp) \
284 284 mutex_enter(&csp->s_lock); \
285 285 UNLOCK_CSP_LOCK_HELD(csp); \
286 286 mutex_exit(&csp->s_lock);
287 287
288 288 /*
289 289 * compute/return the size of the device
290 290 */
291 291 #define SPEC_SIZE(csp) \
292 292 (((csp)->s_flag & SSIZEVALID) ? (csp)->s_size : spec_size(csp))
293 293
294 294 /*
295 295 * Compute and return the size. If the size in the common snode is valid then
296 296 * return it. If not valid then get the size from the driver and set size in
297 297 * the common snode. If the device has not been attached then we don't ask for
298 298 * an update from the driver- for non-streams SSIZEVALID stays unset until the
299 299 * device is attached. A stat of a mknod outside /devices (non-devfs) may
300 300 * report UNKNOWN_SIZE because the device may not be attached yet (SDIPSET not
301 301 * established in mknod until open time). An stat in /devices will report the
302 302 * size correctly. Specfs should always call SPEC_SIZE instead of referring
303 303 * directly to s_size to initialize/retrieve the size of a device.
304 304 *
305 305 * XXX There is an inconsistency between block and raw - "unknown" is
306 306 * UNKNOWN_SIZE for VBLK and 0 for VCHR(raw).
307 307 */
308 308 static u_offset_t
309 309 spec_size(struct snode *csp)
310 310 {
311 311 struct vnode *cvp = STOV(csp);
312 312 u_offset_t size;
313 313 int plen;
314 314 uint32_t size32;
315 315 dev_t dev;
316 316 dev_info_t *devi;
317 317 major_t maj;
318 318 uint_t blksize;
319 319 int blkshift;
320 320
321 321 ASSERT((csp)->s_commonvp == cvp); /* must be common node */
322 322
323 323 /* return cached value */
324 324 mutex_enter(&csp->s_lock);
325 325 if (csp->s_flag & SSIZEVALID) {
326 326 mutex_exit(&csp->s_lock);
327 327 return (csp->s_size);
328 328 }
329 329
330 330 /* VOP_GETATTR of mknod has not had devcnt restriction applied */
331 331 dev = cvp->v_rdev;
332 332 maj = getmajor(dev);
333 333 if (maj >= devcnt) {
334 334 /* return non-cached UNKNOWN_SIZE */
335 335 mutex_exit(&csp->s_lock);
336 336 return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE);
337 337 }
338 338
339 339 /* establish cached zero size for streams */
340 340 if (STREAMSTAB(maj)) {
341 341 csp->s_size = 0;
342 342 csp->s_flag |= SSIZEVALID;
343 343 mutex_exit(&csp->s_lock);
344 344 return (0);
345 345 }
346 346
347 347 /*
348 348 * Return non-cached UNKNOWN_SIZE if not open.
349 349 *
350 350 * NB: This check is bogus, calling prop_op(9E) should be gated by
351 351 * attach, not open. Not having this check however opens up a new
352 352 * context under which a driver's prop_op(9E) could be called. Calling
353 353 * prop_op(9E) in this new context has been shown to expose latent
354 354 * driver bugs (insufficient NULL pointer checks that lead to panic).
355 355 * We are keeping this open check for now to avoid these panics.
356 356 */
357 357 if (csp->s_count == 0) {
358 358 mutex_exit(&csp->s_lock);
359 359 return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE);
360 360 }
361 361
362 362 /* Return non-cached UNKNOWN_SIZE if not attached. */
363 363 if (((csp->s_flag & SDIPSET) == 0) || (csp->s_dip == NULL) ||
364 364 !i_ddi_devi_attached(csp->s_dip)) {
365 365 mutex_exit(&csp->s_lock);
366 366 return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE);
367 367 }
368 368
369 369 devi = csp->s_dip;
370 370
371 371 /*
372 372 * Established cached size obtained from the attached driver. Since we
373 373 * know the devinfo node, for efficiency we use cdev_prop_op directly
374 374 * instead of [cb]dev_[Ss]size.
375 375 */
376 376 if (cvp->v_type == VCHR) {
377 377 size = 0;
378 378 plen = sizeof (size);
379 379 if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF,
380 380 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS |
381 381 DDI_PROP_CONSUMER_TYPED, "Size", (caddr_t)&size,
382 382 &plen) != DDI_PROP_SUCCESS) {
383 383 plen = sizeof (size32);
384 384 if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF,
385 385 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS,
386 386 "size", (caddr_t)&size32, &plen) ==
387 387 DDI_PROP_SUCCESS)
388 388 size = size32;
389 389 }
390 390 } else {
391 391 size = UNKNOWN_SIZE;
392 392 plen = sizeof (size);
393 393 if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF,
394 394 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS |
395 395 DDI_PROP_CONSUMER_TYPED, "Nblocks", (caddr_t)&size,
396 396 &plen) != DDI_PROP_SUCCESS) {
397 397 plen = sizeof (size32);
398 398 if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF,
399 399 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS,
400 400 "nblocks", (caddr_t)&size32, &plen) ==
401 401 DDI_PROP_SUCCESS)
402 402 size = size32;
403 403 }
404 404
405 405 if (size != UNKNOWN_SIZE) {
406 406 blksize = DEV_BSIZE; /* default */
407 407 plen = sizeof (blksize);
408 408
409 409 /* try to get dev_t specific "blksize" */
410 410 if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF,
411 411 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS,
412 412 "blksize", (caddr_t)&blksize, &plen) !=
413 413 DDI_PROP_SUCCESS) {
414 414 /*
415 415 * Try for dev_info node "device-blksize".
416 416 * If this fails then blksize will still be
417 417 * DEV_BSIZE default value.
418 418 */
419 419 (void) cdev_prop_op(DDI_DEV_T_ANY, devi,
420 420 PROP_LEN_AND_VAL_BUF,
421 421 DDI_PROP_NOTPROM | DDI_PROP_DONTPASS,
422 422 "device-blksize", (caddr_t)&blksize, &plen);
423 423 }
424 424
425 425 /* blksize must be a power of two */
426 426 ASSERT(BIT_ONLYONESET(blksize));
427 427 blkshift = highbit(blksize) - 1;
428 428
429 429 /* convert from block size to byte size */
430 430 if (size < (MAXOFFSET_T >> blkshift))
431 431 size = size << blkshift;
432 432 else
433 433 size = UNKNOWN_SIZE;
434 434 }
435 435 }
436 436
437 437 csp->s_size = size;
438 438 csp->s_flag |= SSIZEVALID;
439 439
440 440 mutex_exit(&csp->s_lock);
441 441 return (size);
442 442 }
443 443
444 444 /*
445 445 * This function deal with vnode substitution in the case of
446 446 * device cloning.
447 447 */
448 448 static int
449 449 spec_clone(struct vnode **vpp, dev_t newdev, int vtype, struct stdata *stp)
450 450 {
451 451 dev_t dev = (*vpp)->v_rdev;
452 452 major_t maj = getmajor(dev);
453 453 major_t newmaj = getmajor(newdev);
454 454 int sysclone = (maj == clone_major);
455 455 int qassociate_used = 0;
456 456 struct snode *oldsp, *oldcsp;
457 457 struct snode *newsp, *newcsp;
458 458 struct vnode *newvp, *newcvp;
459 459 dev_info_t *dip;
460 460 queue_t *dq;
461 461
462 462 ASSERT(dev != newdev);
463 463
464 464 /*
465 465 * Check for cloning across different drivers.
466 466 * We only support this under the system provided clone driver
467 467 */
468 468 if ((maj != newmaj) && !sysclone) {
469 469 cmn_err(CE_NOTE,
470 470 "unsupported clone open maj = %u, newmaj = %u",
471 471 maj, newmaj);
472 472 return (ENXIO);
473 473 }
474 474
475 475 /* old */
476 476 oldsp = VTOS(*vpp);
477 477 oldcsp = VTOS(oldsp->s_commonvp);
478 478
479 479 /* new */
480 480 newvp = makespecvp(newdev, vtype);
481 481 ASSERT(newvp != NULL);
482 482 newsp = VTOS(newvp);
483 483 newcvp = newsp->s_commonvp;
484 484 newcsp = VTOS(newcvp);
485 485
486 486 /*
487 487 * Clones inherit fsid, realvp, and dip.
488 488 * XXX realvp inherit is not occurring, does fstat of clone work?
489 489 */
490 490 newsp->s_fsid = oldsp->s_fsid;
491 491 if (sysclone) {
492 492 newsp->s_flag |= SCLONE;
493 493 dip = NULL;
494 494 } else {
495 495 newsp->s_flag |= SSELFCLONE;
496 496 dip = oldcsp->s_dip;
497 497 }
498 498
499 499 /*
500 500 * If we cloned to an opened newdev that already has called
501 501 * spec_assoc_vp_with_devi (SDIPSET set) then the association is
502 502 * already established.
503 503 */
504 504 if (!(newcsp->s_flag & SDIPSET)) {
505 505 /*
506 506 * Establish s_dip association for newdev.
507 507 *
508 508 * If we trusted the getinfo(9E) DDI_INFO_DEVT2INSTANCE
509 509 * implementation of all cloning drivers (SCLONE and SELFCLONE)
510 510 * we would always use e_ddi_hold_devi_by_dev(). We know that
511 511 * many drivers have had (still have?) problems with
512 512 * DDI_INFO_DEVT2INSTANCE, so we try to minimize reliance by
513 513 * detecting drivers that use QASSOCIATE (by looking down the
514 514 * stream) and setting their s_dip association to NULL.
515 515 */
516 516 qassociate_used = 0;
517 517 if (stp) {
518 518 for (dq = stp->sd_wrq; dq; dq = dq->q_next) {
519 519 if (_RD(dq)->q_flag & _QASSOCIATED) {
520 520 qassociate_used = 1;
521 521 dip = NULL;
522 522 break;
523 523 }
524 524 }
525 525 }
526 526
527 527 if (dip || qassociate_used) {
528 528 spec_assoc_vp_with_devi(newvp, dip);
529 529 } else {
530 530 /* derive association from newdev */
531 531 dip = e_ddi_hold_devi_by_dev(newdev, 0);
532 532 spec_assoc_vp_with_devi(newvp, dip);
533 533 if (dip)
534 534 ddi_release_devi(dip);
535 535 }
536 536 }
537 537
538 538 SN_HOLD(newcsp);
539 539
540 540 /* deal with stream stuff */
541 541 if (stp != NULL) {
542 542 LOCK_CSP(newcsp); /* synchronize stream open/close */
543 543 mutex_enter(&newcsp->s_lock);
544 544 newcvp->v_stream = newvp->v_stream = stp;
545 545 stp->sd_vnode = newcvp;
546 546 stp->sd_strtab = STREAMSTAB(newmaj);
547 547 mutex_exit(&newcsp->s_lock);
548 548 UNLOCK_CSP(newcsp);
549 549 }
550 550
551 551 /* substitute the vnode */
552 552 SN_RELE(oldcsp);
553 553 VN_RELE(*vpp);
554 554 *vpp = newvp;
555 555
556 556 return (0);
557 557 }
558 558
559 559 static int
560 560 spec_open(struct vnode **vpp, int flag, struct cred *cr, caller_context_t *cc)
561 561 {
562 562 major_t maj;
563 563 dev_t dev, newdev;
564 564 struct vnode *vp, *cvp;
565 565 struct snode *sp, *csp;
566 566 struct stdata *stp;
567 567 dev_info_t *dip;
568 568 int error, type;
569 569 contract_t *ct = NULL;
570 570 int open_returns_eintr;
571 571 slock_ret_t spec_locksp_ret;
572 572
573 573
574 574 flag &= ~FCREAT; /* paranoia */
575 575
576 576 vp = *vpp;
577 577 sp = VTOS(vp);
578 578 ASSERT((vp->v_type == VCHR) || (vp->v_type == VBLK));
579 579 if ((vp->v_type != VCHR) && (vp->v_type != VBLK))
580 580 return (ENXIO);
581 581
582 582 /*
583 583 * If the VFS_NODEVICES bit was set for the mount,
584 584 * do not allow opens of special devices.
585 585 */
586 586 if (sp->s_realvp && (sp->s_realvp->v_vfsp->vfs_flag & VFS_NODEVICES))
587 587 return (ENXIO);
588 588
589 589 newdev = dev = vp->v_rdev;
590 590
591 591 /*
592 592 * If we are opening a node that has not had spec_assoc_vp_with_devi
593 593 * called against it (mknod outside /devices or a non-dacf makespecvp
594 594 * node) then SDIPSET will not be set. In this case we call an
595 595 * interface which will reconstruct the path and lookup (drive attach)
596 596 * through devfs (e_ddi_hold_devi_by_dev -> e_ddi_hold_devi_by_path ->
597 597 * devfs_lookupname). For support of broken drivers that don't call
598 598 * ddi_create_minor_node for all minor nodes in their instance space,
599 599 * we call interfaces that operates at the directory/devinfo
600 600 * (major/instance) level instead of to the leaf/minor node level.
601 601 * After finding and attaching the dip we associate it with the
602 602 * common specfs vnode (s_dip), which sets SDIPSET. A DL_DETACH_REQ
603 603 * to style-2 stream driver may set s_dip to NULL with SDIPSET set.
604 604 *
605 605 * NOTE: Although e_ddi_hold_devi_by_dev takes a dev_t argument, its
606 606 * implementation operates at the major/instance level since it only
607 607 * need to return a dip.
608 608 */
609 609 cvp = sp->s_commonvp;
610 610 csp = VTOS(cvp);
611 611 if (!(csp->s_flag & SDIPSET)) {
612 612 /* try to attach, return error if we fail */
613 613 if ((dip = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
614 614 return (ENXIO);
615 615
616 616 /* associate dip with the common snode s_dip */
617 617 spec_assoc_vp_with_devi(vp, dip);
618 618 ddi_release_devi(dip); /* from e_ddi_hold_devi_by_dev */
619 619 }
620 620
621 621 /* check if device fenced off */
622 622 if (S_ISFENCED(sp))
623 623 return (ENXIO);
624 624
625 625 #ifdef DEBUG
626 626 /* verify attach/open exclusion guarantee */
627 627 dip = csp->s_dip;
628 628 ASSERT((dip == NULL) || i_ddi_devi_attached(dip));
629 629 #endif /* DEBUG */
630 630
631 631 if ((error = secpolicy_spec_open(cr, vp, flag)) != 0)
632 632 return (error);
633 633
634 634 /* Verify existance of open(9E) implementation. */
635 635 maj = getmajor(dev);
636 636 if ((maj >= devcnt) ||
637 637 (devopsp[maj]->devo_cb_ops == NULL) ||
638 638 (devopsp[maj]->devo_cb_ops->cb_open == NULL))
639 639 return (ENXIO);
640 640
641 641 /*
642 642 * split STREAMS vs. non-STREAMS
643 643 *
644 644 * If the device is a dual-personality device, then we might want
645 645 * to allow for a regular OTYP_BLK open. If however it's strictly
646 646 * a pure STREAMS device, the cb_open entry point will be
647 647 * nodev() which returns ENXIO. This does make this failure path
648 648 * somewhat longer, but such attempts to use OTYP_BLK with STREAMS
649 649 * devices should be exceedingly rare. (Most of the time they will
650 650 * be due to programmer error.)
651 651 */
652 652 if ((vp->v_type == VCHR) && (STREAMSTAB(maj)))
653 653 goto streams_open;
654 654
655 655 not_streams:
656 656 /*
657 657 * Wait for in progress last close to complete. This guarantees
658 658 * to the driver writer that we will never be in the drivers
659 659 * open and close on the same (dev_t, otype) at the same time.
660 660 * Open count already incremented (SN_HOLD) on non-zero return.
661 661 * The wait is interruptible by a signal if the driver sets the
662 662 * D_OPEN_RETURNS_EINTR cb_ops(9S) cb_flag or sets the
663 663 * ddi-open-returns-eintr(9P) property in its driver.conf.
664 664 */
665 665 if ((devopsp[maj]->devo_cb_ops->cb_flag & D_OPEN_RETURNS_EINTR) ||
666 666 (devnamesp[maj].dn_flags & DN_OPEN_RETURNS_EINTR))
667 667 open_returns_eintr = 1;
668 668 else
669 669 open_returns_eintr = 0;
670 670 while ((spec_locksp_ret = SYNCHOLD_CSP_SIG(csp, open_returns_eintr)) !=
671 671 SUCCESS) {
672 672 if (spec_locksp_ret == INTR)
673 673 return (EINTR);
674 674 }
675 675
676 676 /* non streams open */
677 677 type = (vp->v_type == VBLK ? OTYP_BLK : OTYP_CHR);
678 678 error = dev_open(&newdev, flag, type, cr);
679 679
680 680 /* deal with clone case */
681 681 if (error == 0 && dev != newdev) {
682 682 error = spec_clone(vpp, newdev, vp->v_type, NULL);
683 683 /*
684 684 * bail on clone failure, further processing
685 685 * results in undefined behaviors.
686 686 */
687 687 if (error != 0)
688 688 return (error);
689 689 sp = VTOS(*vpp);
690 690 csp = VTOS(sp->s_commonvp);
691 691 }
692 692
693 693 /*
694 694 * create contracts only for userland opens
695 695 * Successful open and cloning is done at this point.
696 696 */
697 697 if (error == 0 && !(flag & FKLYR)) {
698 698 int spec_type;
699 699 spec_type = (STOV(csp)->v_type == VCHR) ? S_IFCHR : S_IFBLK;
700 700 if (contract_device_open(newdev, spec_type, NULL) != 0) {
701 701 error = EIO;
702 702 }
703 703 }
704 704
705 705 if (error == 0) {
706 706 sp->s_size = SPEC_SIZE(csp);
707 707
708 708 if ((csp->s_flag & SNEEDCLOSE) == 0) {
709 709 int nmaj = getmajor(newdev);
710 710 mutex_enter(&csp->s_lock);
711 711 /* successful open needs a close later */
712 712 csp->s_flag |= SNEEDCLOSE;
713 713
714 714 /*
715 715 * Invalidate possible cached "unknown" size
716 716 * established by a VOP_GETATTR while open was in
717 717 * progress, and the driver might fail prop_op(9E).
718 718 */
719 719 if (((cvp->v_type == VCHR) && (csp->s_size == 0)) ||
720 720 ((cvp->v_type == VBLK) &&
721 721 (csp->s_size == UNKNOWN_SIZE)))
722 722 csp->s_flag &= ~SSIZEVALID;
723 723
724 724 if (devopsp[nmaj]->devo_cb_ops->cb_flag & D_64BIT)
725 725 csp->s_flag |= SLOFFSET;
726 726 if (devopsp[nmaj]->devo_cb_ops->cb_flag & D_U64BIT)
727 727 csp->s_flag |= SLOFFSET | SANYOFFSET;
728 728 mutex_exit(&csp->s_lock);
729 729 }
730 730 return (0);
731 731 }
732 732
733 733 /*
734 734 * Open failed. If we missed a close operation because
735 735 * we were trying to get the device open and it is the
736 736 * last in progress open that is failing then call close.
737 737 *
738 738 * NOTE: Only non-streams open has this race condition.
739 739 */
740 740 mutex_enter(&csp->s_lock);
741 741 csp->s_count--; /* decrement open count : SN_RELE */
742 742 if ((csp->s_count == 0) && /* no outstanding open */
743 743 (csp->s_mapcnt == 0) && /* no mapping */
744 744 (csp->s_flag & SNEEDCLOSE)) { /* need a close */
745 745 csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID);
746 746
747 747 /* See comment in spec_close() */
748 748 if (csp->s_flag & (SCLONE | SSELFCLONE))
749 749 csp->s_flag &= ~SDIPSET;
750 750
751 751 csp->s_flag |= SCLOSING;
752 752 mutex_exit(&csp->s_lock);
753 753
754 754 ASSERT(*vpp != NULL);
755 755 (void) device_close(*vpp, flag, cr);
756 756
757 757 mutex_enter(&csp->s_lock);
758 758 csp->s_flag &= ~SCLOSING;
759 759 mutex_exit(&csp->s_lock);
760 760 } else {
761 761 mutex_exit(&csp->s_lock);
762 762 }
763 763 return (error);
764 764
765 765 streams_open:
766 766 /*
767 767 * Lock common snode to prevent any new clone opens on this
768 768 * stream while one is in progress. This is necessary since
769 769 * the stream currently associated with the clone device will
770 770 * not be part of it after the clone open completes. Unfortunately
771 771 * we don't know in advance if this is a clone
772 772 * device so we have to lock all opens.
773 773 *
774 774 * If we fail, it's because of an interrupt - EINTR return is an
775 775 * expected aspect of opening a stream so we don't need to check
776 776 * D_OPEN_RETURNS_EINTR. Open count already incremented (SN_HOLD)
777 777 * on non-zero return.
778 778 */
779 779 if (LOCKHOLD_CSP_SIG(csp) != SUCCESS)
780 780 return (EINTR);
781 781
782 782 error = stropen(cvp, &newdev, flag, cr);
783 783 stp = cvp->v_stream;
784 784
785 785 /* deal with the clone case */
786 786 if ((error == 0) && (dev != newdev)) {
787 787 vp->v_stream = cvp->v_stream = NULL;
788 788 UNLOCK_CSP(csp);
789 789 error = spec_clone(vpp, newdev, vp->v_type, stp);
790 790 /*
791 791 * bail on clone failure, further processing
792 792 * results in undefined behaviors.
793 793 */
794 794 if (error != 0)
795 795 return (error);
796 796 sp = VTOS(*vpp);
797 797 csp = VTOS(sp->s_commonvp);
798 798 } else if (error == 0) {
799 799 vp->v_stream = stp;
800 800 UNLOCK_CSP(csp);
801 801 }
802 802
803 803 /*
804 804 * create contracts only for userland opens
805 805 * Successful open and cloning is done at this point.
806 806 */
807 807 if (error == 0 && !(flag & FKLYR)) {
808 808 /* STREAM is of type S_IFCHR */
809 809 if (contract_device_open(newdev, S_IFCHR, &ct) != 0) {
810 810 UNLOCK_CSP(csp);
811 811 (void) spec_close(vp, flag, 1, 0, cr, cc);
812 812 return (EIO);
813 813 }
814 814 }
815 815
816 816 if (error == 0) {
817 817 /* STREAMS devices don't have a size */
818 818 sp->s_size = csp->s_size = 0;
819 819
820 820 if (!(stp->sd_flag & STRISTTY) || (flag & FNOCTTY))
821 821 return (0);
822 822
823 823 /* try to allocate it as a controlling terminal */
824 824 if (strctty(stp) != EINTR)
825 825 return (0);
826 826
827 827 /* strctty() was interrupted by a signal */
828 828 if (ct) {
829 829 /* we only create contracts for userland opens */
830 830 ASSERT(ttoproc(curthread));
831 831 (void) contract_abandon(ct, ttoproc(curthread), 0);
832 832 }
833 833 (void) spec_close(vp, flag, 1, 0, cr, cc);
834 834 return (EINTR);
835 835 }
836 836
837 837 /*
838 838 * Deal with stropen failure.
839 839 *
840 840 * sd_flag in the stream head cannot change since the
841 841 * common snode is locked before the call to stropen().
842 842 */
843 843 if ((stp != NULL) && (stp->sd_flag & STREOPENFAIL)) {
844 844 /*
845 845 * Open failed part way through.
846 846 */
847 847 mutex_enter(&stp->sd_lock);
848 848 stp->sd_flag &= ~STREOPENFAIL;
849 849 mutex_exit(&stp->sd_lock);
850 850
851 851 UNLOCK_CSP(csp);
852 852 (void) spec_close(vp, flag, 1, 0, cr, cc);
853 853 } else {
854 854 UNLOCK_CSP(csp);
855 855 SN_RELE(csp);
856 856 }
857 857
858 858 /*
859 859 * Resolution for STREAMS vs. regular character device: If the
860 860 * STREAMS open(9e) returns ENOSTR, then try an ordinary device
861 861 * open instead.
862 862 */
863 863 if (error == ENOSTR) {
864 864 goto not_streams;
865 865 }
866 866 return (error);
867 867 }
868 868
869 869 /*ARGSUSED2*/
870 870 static int
871 871 spec_close(
872 872 struct vnode *vp,
873 873 int flag,
874 874 int count,
875 875 offset_t offset,
876 876 struct cred *cr,
877 877 caller_context_t *ct)
878 878 {
879 879 struct vnode *cvp;
880 880 struct snode *sp, *csp;
881 881 enum vtype type;
882 882 dev_t dev;
883 883 int error = 0;
884 884 int sysclone;
885 885
886 886 if (!(flag & FKLYR)) {
887 887 /* this only applies to closes of devices from userland */
888 888 cleanlocks(vp, ttoproc(curthread)->p_pid, 0);
889 889 cleanshares(vp, ttoproc(curthread)->p_pid);
890 890 if (vp->v_stream)
891 891 strclean(vp);
892 892 }
893 893 if (count > 1)
894 894 return (0);
895 895
896 896 /* we allow close to succeed even if device is fenced off */
897 897 sp = VTOS(vp);
898 898 cvp = sp->s_commonvp;
899 899
900 900 dev = sp->s_dev;
901 901 type = vp->v_type;
902 902
903 903 ASSERT(type == VCHR || type == VBLK);
904 904
905 905 /*
906 906 * Prevent close/close and close/open races by serializing closes
907 907 * on this common snode. Clone opens are held up until after
908 908 * we have closed this device so the streams linkage is maintained
909 909 */
910 910 csp = VTOS(cvp);
911 911
912 912 LOCK_CSP(csp);
913 913 mutex_enter(&csp->s_lock);
914 914
915 915 csp->s_count--; /* one fewer open reference : SN_RELE */
916 916 sysclone = sp->s_flag & SCLONE;
917 917
918 918 /*
919 919 * Invalidate size on each close.
920 920 *
921 921 * XXX We do this on each close because we don't have interfaces that
922 922 * allow a driver to invalidate the size. Since clearing this on each
923 923 * close this causes property overhead we skip /dev/null and
924 924 * /dev/zero to avoid degrading kenbus performance.
925 925 */
926 926 if (getmajor(dev) != mm_major)
927 927 csp->s_flag &= ~SSIZEVALID;
928 928
929 929 /*
930 930 * Only call the close routine when the last open reference through
931 931 * any [s, v]node goes away. This can be checked by looking at
932 932 * s_count on the common vnode.
933 933 */
934 934 if ((csp->s_count == 0) && (csp->s_mapcnt == 0)) {
935 935 /* we don't need a close */
936 936 csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID);
937 937
938 938 /*
939 939 * A cloning driver may open-clone to the same dev_t that we
940 940 * are closing before spec_inactive destroys the common snode.
941 941 * If this occurs the s_dip association needs to be reevaluated.
942 942 * We clear SDIPSET to force reevaluation in this case. When
943 943 * reevaluation occurs (by spec_clone after open), if the
944 944 * devinfo association has changed then the old association
945 945 * will be released as the new association is established by
946 946 * spec_assoc_vp_with_devi().
947 947 */
948 948 if (csp->s_flag & (SCLONE | SSELFCLONE))
949 949 csp->s_flag &= ~SDIPSET;
950 950
951 951 csp->s_flag |= SCLOSING;
952 952 mutex_exit(&csp->s_lock);
953 953 error = device_close(vp, flag, cr);
954 954
955 955 /*
956 956 * Decrement the devops held in clnopen()
957 957 */
958 958 if (sysclone) {
959 959 ddi_rele_driver(getmajor(dev));
960 960 }
961 961 mutex_enter(&csp->s_lock);
962 962 csp->s_flag &= ~SCLOSING;
963 963 }
964 964
965 965 UNLOCK_CSP_LOCK_HELD(csp);
966 966 mutex_exit(&csp->s_lock);
967 967
968 968 return (error);
969 969 }
970 970
971 971 /*ARGSUSED2*/
972 972 static int
973 973 spec_read(
974 974 struct vnode *vp,
975 975 struct uio *uiop,
976 976 int ioflag,
977 977 struct cred *cr,
978 978 caller_context_t *ct)
979 979 {
980 980 int error;
981 981 struct snode *sp = VTOS(vp);
982 982 dev_t dev = sp->s_dev;
983 983 size_t n;
984 984 ulong_t on;
985 985 u_offset_t bdevsize;
986 986 offset_t maxoff;
987 987 offset_t off;
988 988 struct vnode *blkvp;
989 989
990 990 ASSERT(vp->v_type == VCHR || vp->v_type == VBLK);
991 991
992 992 if (vp->v_stream) {
993 993 ASSERT(vp->v_type == VCHR);
994 994 smark(sp, SACC);
995 995 return (strread(vp, uiop, cr));
996 996 }
997 997
998 998 if (uiop->uio_resid == 0)
999 999 return (0);
1000 1000
1001 1001 /*
1002 1002 * Plain old character devices that set D_U64BIT can have
1003 1003 * unrestricted offsets.
1004 1004 */
1005 1005 maxoff = spec_maxoffset(vp);
1006 1006 ASSERT(maxoff != -1 || vp->v_type == VCHR);
1007 1007
1008 1008 if (maxoff != -1 && (uiop->uio_loffset < 0 ||
1009 1009 uiop->uio_loffset + uiop->uio_resid > maxoff))
1010 1010 return (EINVAL);
1011 1011
1012 1012 if (vp->v_type == VCHR) {
1013 1013 smark(sp, SACC);
1014 1014 ASSERT(vp->v_stream == NULL);
1015 1015 return (cdev_read(dev, uiop, cr));
1016 1016 }
1017 1017
1018 1018 /*
1019 1019 * Block device.
1020 1020 */
1021 1021 error = 0;
1022 1022 blkvp = sp->s_commonvp;
1023 1023 bdevsize = SPEC_SIZE(VTOS(blkvp));
1024 1024
1025 1025 do {
1026 1026 caddr_t base;
1027 1027 offset_t diff;
1028 1028
1029 1029 off = uiop->uio_loffset & (offset_t)MAXBMASK;
1030 1030 on = (size_t)(uiop->uio_loffset & MAXBOFFSET);
1031 1031 n = (size_t)MIN(MAXBSIZE - on, uiop->uio_resid);
1032 1032 diff = bdevsize - uiop->uio_loffset;
1033 1033
1034 1034 if (diff <= 0)
1035 1035 break;
1036 1036 if (diff < n)
1037 1037 n = (size_t)diff;
1038 1038
1039 1039 if (vpm_enable) {
1040 1040 error = vpm_data_copy(blkvp, (u_offset_t)(off + on),
1041 1041 n, uiop, 1, NULL, 0, S_READ);
1042 1042 } else {
1043 1043 base = segmap_getmapflt(segkmap, blkvp,
1044 1044 (u_offset_t)(off + on), n, 1, S_READ);
1045 1045
1046 1046 error = uiomove(base + on, n, UIO_READ, uiop);
1047 1047 }
1048 1048 if (!error) {
1049 1049 int flags = 0;
1050 1050 /*
1051 1051 * If we read a whole block, we won't need this
1052 1052 * buffer again soon.
1053 1053 */
1054 1054 if (n + on == MAXBSIZE)
1055 1055 flags = SM_DONTNEED | SM_FREE;
1056 1056 if (vpm_enable) {
1057 1057 error = vpm_sync_pages(blkvp, off, n, flags);
1058 1058 } else {
1059 1059 error = segmap_release(segkmap, base, flags);
1060 1060 }
1061 1061 } else {
1062 1062 if (vpm_enable) {
1063 1063 (void) vpm_sync_pages(blkvp, off, n, 0);
1064 1064 } else {
1065 1065 (void) segmap_release(segkmap, base, 0);
1066 1066 }
1067 1067 if (bdevsize == UNKNOWN_SIZE) {
1068 1068 error = 0;
1069 1069 break;
1070 1070 }
1071 1071 }
1072 1072 } while (error == 0 && uiop->uio_resid > 0 && n != 0);
1073 1073
1074 1074 return (error);
1075 1075 }
1076 1076
1077 1077 /*ARGSUSED*/
1078 1078 static int
1079 1079 spec_write(
1080 1080 struct vnode *vp,
1081 1081 struct uio *uiop,
1082 1082 int ioflag,
1083 1083 struct cred *cr,
1084 1084 caller_context_t *ct)
1085 1085 {
1086 1086 int error;
1087 1087 struct snode *sp = VTOS(vp);
1088 1088 dev_t dev = sp->s_dev;
1089 1089 size_t n;
1090 1090 ulong_t on;
1091 1091 u_offset_t bdevsize;
1092 1092 offset_t maxoff;
1093 1093 offset_t off;
1094 1094 struct vnode *blkvp;
1095 1095
1096 1096 ASSERT(vp->v_type == VCHR || vp->v_type == VBLK);
1097 1097
1098 1098 if (vp->v_stream) {
1099 1099 ASSERT(vp->v_type == VCHR);
1100 1100 smark(sp, SUPD);
1101 1101 return (strwrite(vp, uiop, cr));
1102 1102 }
1103 1103
1104 1104 /*
1105 1105 * Plain old character devices that set D_U64BIT can have
1106 1106 * unrestricted offsets.
1107 1107 */
1108 1108 maxoff = spec_maxoffset(vp);
1109 1109 ASSERT(maxoff != -1 || vp->v_type == VCHR);
1110 1110
1111 1111 if (maxoff != -1 && (uiop->uio_loffset < 0 ||
1112 1112 uiop->uio_loffset + uiop->uio_resid > maxoff))
1113 1113 return (EINVAL);
1114 1114
1115 1115 if (vp->v_type == VCHR) {
1116 1116 smark(sp, SUPD);
1117 1117 ASSERT(vp->v_stream == NULL);
1118 1118 return (cdev_write(dev, uiop, cr));
1119 1119 }
1120 1120
1121 1121 if (uiop->uio_resid == 0)
1122 1122 return (0);
1123 1123
1124 1124 error = 0;
1125 1125 blkvp = sp->s_commonvp;
1126 1126 bdevsize = SPEC_SIZE(VTOS(blkvp));
1127 1127
1128 1128 do {
1129 1129 int pagecreate;
1130 1130 int newpage;
1131 1131 caddr_t base;
1132 1132 offset_t diff;
1133 1133
1134 1134 off = uiop->uio_loffset & (offset_t)MAXBMASK;
1135 1135 on = (ulong_t)(uiop->uio_loffset & MAXBOFFSET);
1136 1136 n = (size_t)MIN(MAXBSIZE - on, uiop->uio_resid);
1137 1137 pagecreate = 0;
1138 1138
1139 1139 diff = bdevsize - uiop->uio_loffset;
1140 1140 if (diff <= 0) {
1141 1141 error = ENXIO;
1142 1142 break;
1143 1143 }
1144 1144 if (diff < n)
1145 1145 n = (size_t)diff;
1146 1146
1147 1147 /*
1148 1148 * Check to see if we can skip reading in the page
1149 1149 * and just allocate the memory. We can do this
1150 1150 * if we are going to rewrite the entire mapping
1151 1151 * or if we are going to write to end of the device
1152 1152 * from the beginning of the mapping.
1153 1153 */
1154 1154 if (n == MAXBSIZE || (on == 0 && (off + n) == bdevsize))
1155 1155 pagecreate = 1;
1156 1156
1157 1157 newpage = 0;
1158 1158
1159 1159 /*
1160 1160 * Touch the page and fault it in if it is not in core
1161 1161 * before segmap_getmapflt or vpm_data_copy can lock it.
1162 1162 * This is to avoid the deadlock if the buffer is mapped
1163 1163 * to the same file through mmap which we want to write.
1164 1164 */
1165 1165 uio_prefaultpages((long)n, uiop);
1166 1166
1167 1167 if (vpm_enable) {
1168 1168 error = vpm_data_copy(blkvp, (u_offset_t)(off + on),
1169 1169 n, uiop, !pagecreate, NULL, 0, S_WRITE);
1170 1170 } else {
1171 1171 base = segmap_getmapflt(segkmap, blkvp,
1172 1172 (u_offset_t)(off + on), n, !pagecreate, S_WRITE);
1173 1173
1174 1174 /*
1175 1175 * segmap_pagecreate() returns 1 if it calls
1176 1176 * page_create_va() to allocate any pages.
1177 1177 */
1178 1178
1179 1179 if (pagecreate)
1180 1180 newpage = segmap_pagecreate(segkmap, base + on,
1181 1181 n, 0);
1182 1182
1183 1183 error = uiomove(base + on, n, UIO_WRITE, uiop);
1184 1184 }
1185 1185
1186 1186 if (!vpm_enable && pagecreate &&
1187 1187 uiop->uio_loffset <
1188 1188 P2ROUNDUP_TYPED(off + on + n, PAGESIZE, offset_t)) {
1189 1189 /*
1190 1190 * We created pages w/o initializing them completely,
1191 1191 * thus we need to zero the part that wasn't set up.
1192 1192 * This can happen if we write to the end of the device
1193 1193 * or if we had some sort of error during the uiomove.
1194 1194 */
1195 1195 long nzero;
1196 1196 offset_t nmoved;
1197 1197
1198 1198 nmoved = (uiop->uio_loffset - (off + on));
1199 1199 if (nmoved < 0 || nmoved > n) {
1200 1200 panic("spec_write: nmoved bogus");
1201 1201 /*NOTREACHED*/
1202 1202 }
1203 1203 nzero = (long)P2ROUNDUP(on + n, PAGESIZE) -
1204 1204 (on + nmoved);
1205 1205 if (nzero < 0 || (on + nmoved + nzero > MAXBSIZE)) {
1206 1206 panic("spec_write: nzero bogus");
1207 1207 /*NOTREACHED*/
1208 1208 }
1209 1209 (void) kzero(base + on + nmoved, (size_t)nzero);
1210 1210 }
1211 1211
1212 1212 /*
1213 1213 * Unlock the pages which have been allocated by
1214 1214 * page_create_va() in segmap_pagecreate().
1215 1215 */
1216 1216 if (!vpm_enable && newpage)
1217 1217 segmap_pageunlock(segkmap, base + on,
1218 1218 (size_t)n, S_WRITE);
1219 1219
1220 1220 if (error == 0) {
1221 1221 int flags = 0;
1222 1222
1223 1223 /*
1224 1224 * Force write back for synchronous write cases.
1225 1225 */
1226 1226 if (ioflag & (FSYNC|FDSYNC))
1227 1227 flags = SM_WRITE;
1228 1228 else if (n + on == MAXBSIZE || IS_SWAPVP(vp)) {
1229 1229 /*
1230 1230 * Have written a whole block.
1231 1231 * Start an asynchronous write and
1232 1232 * mark the buffer to indicate that
1233 1233 * it won't be needed again soon.
1234 1234 * Push swap files here, since it
1235 1235 * won't happen anywhere else.
1236 1236 */
1237 1237 flags = SM_WRITE | SM_ASYNC | SM_DONTNEED;
1238 1238 }
1239 1239 smark(sp, SUPD|SCHG);
1240 1240 if (vpm_enable) {
1241 1241 error = vpm_sync_pages(blkvp, off, n, flags);
1242 1242 } else {
1243 1243 error = segmap_release(segkmap, base, flags);
1244 1244 }
1245 1245 } else {
1246 1246 if (vpm_enable) {
1247 1247 (void) vpm_sync_pages(blkvp, off, n, SM_INVAL);
1248 1248 } else {
1249 1249 (void) segmap_release(segkmap, base, SM_INVAL);
1250 1250 }
1251 1251 }
1252 1252
1253 1253 } while (error == 0 && uiop->uio_resid > 0 && n != 0);
1254 1254
1255 1255 return (error);
1256 1256 }
1257 1257
1258 1258 /*ARGSUSED6*/
1259 1259 static int
1260 1260 spec_ioctl(struct vnode *vp, int cmd, intptr_t arg, int mode, struct cred *cr,
1261 1261 int *rvalp, caller_context_t *ct)
1262 1262 {
1263 1263 struct snode *sp;
1264 1264 dev_t dev;
1265 1265 int error;
1266 1266
1267 1267 if (vp->v_type != VCHR)
1268 1268 return (ENOTTY);
1269 1269
1270 1270 /*
1271 1271 * allow ioctls() to go through even for fenced snodes, as they
1272 1272 * may include unconfiguration operation - for example popping of
1273 1273 * streams modules.
1274 1274 */
1275 1275
1276 1276 sp = VTOS(vp);
1277 1277 dev = sp->s_dev;
1278 1278 if (vp->v_stream) {
1279 1279 error = strioctl(vp, cmd, arg, mode, U_TO_K, cr, rvalp);
1280 1280 } else {
1281 1281 error = cdev_ioctl(dev, cmd, arg, mode, cr, rvalp);
1282 1282 }
1283 1283 return (error);
1284 1284 }
1285 1285
1286 1286 static int
1287 1287 spec_getattr(
1288 1288 struct vnode *vp,
1289 1289 struct vattr *vap,
1290 1290 int flags,
1291 1291 struct cred *cr,
1292 1292 caller_context_t *ct)
1293 1293 {
1294 1294 int error;
1295 1295 struct snode *sp;
1296 1296 struct vnode *realvp;
1297 1297
1298 1298 /* With ATTR_COMM we will not get attributes from realvp */
1299 1299 if (flags & ATTR_COMM) {
1300 1300 sp = VTOS(vp);
1301 1301 vp = sp->s_commonvp;
1302 1302 }
1303 1303 sp = VTOS(vp);
1304 1304
1305 1305 /* we want stat() to fail with ENXIO if the device is fenced off */
1306 1306 if (S_ISFENCED(sp))
1307 1307 return (ENXIO);
1308 1308
1309 1309 realvp = sp->s_realvp;
1310 1310
1311 1311 if (realvp == NULL) {
1312 1312 static int snode_shift = 0;
1313 1313
1314 1314 /*
1315 1315 * Calculate the amount of bitshift to a snode pointer which
1316 1316 * will still keep it unique. See below.
1317 1317 */
1318 1318 if (snode_shift == 0)
1319 1319 snode_shift = highbit(sizeof (struct snode));
1320 1320 ASSERT(snode_shift > 0);
1321 1321
1322 1322 /*
1323 1323 * No real vnode behind this one. Fill in the fields
1324 1324 * from the snode.
1325 1325 *
1326 1326 * This code should be refined to return only the
1327 1327 * attributes asked for instead of all of them.
1328 1328 */
1329 1329 vap->va_type = vp->v_type;
1330 1330 vap->va_mode = 0;
1331 1331 vap->va_uid = vap->va_gid = 0;
1332 1332 vap->va_fsid = sp->s_fsid;
1333 1333
1334 1334 /*
1335 1335 * If the va_nodeid is > MAX_USHORT, then i386 stats might
1336 1336 * fail. So we shift down the snode pointer to try and get
1337 1337 * the most uniqueness into 16-bits.
1338 1338 */
1339 1339 vap->va_nodeid = ((ino64_t)(uintptr_t)sp >> snode_shift) &
1340 1340 0xFFFF;
1341 1341 vap->va_nlink = 0;
1342 1342 vap->va_rdev = sp->s_dev;
1343 1343
1344 1344 /*
1345 1345 * va_nblocks is the number of 512 byte blocks used to store
1346 1346 * the mknod for the device, not the number of blocks on the
1347 1347 * device itself. This is typically zero since the mknod is
1348 1348 * represented directly in the inode itself.
1349 1349 */
1350 1350 vap->va_nblocks = 0;
1351 1351 } else {
1352 1352 error = VOP_GETATTR(realvp, vap, flags, cr, ct);
1353 1353 if (error != 0)
1354 1354 return (error);
1355 1355 }
1356 1356
1357 1357 /* set the size from the snode */
1358 1358 vap->va_size = SPEC_SIZE(VTOS(sp->s_commonvp));
1359 1359 vap->va_blksize = MAXBSIZE;
1360 1360
1361 1361 mutex_enter(&sp->s_lock);
1362 1362 vap->va_atime.tv_sec = sp->s_atime;
1363 1363 vap->va_mtime.tv_sec = sp->s_mtime;
1364 1364 vap->va_ctime.tv_sec = sp->s_ctime;
1365 1365 mutex_exit(&sp->s_lock);
1366 1366
1367 1367 vap->va_atime.tv_nsec = 0;
1368 1368 vap->va_mtime.tv_nsec = 0;
1369 1369 vap->va_ctime.tv_nsec = 0;
1370 1370 vap->va_seq = 0;
1371 1371
1372 1372 return (0);
1373 1373 }
1374 1374
1375 1375 static int
1376 1376 spec_setattr(
1377 1377 struct vnode *vp,
1378 1378 struct vattr *vap,
1379 1379 int flags,
1380 1380 struct cred *cr,
1381 1381 caller_context_t *ct)
1382 1382 {
1383 1383 struct snode *sp = VTOS(vp);
1384 1384 struct vnode *realvp;
1385 1385 int error;
1386 1386
1387 1387 /* fail with ENXIO if the device is fenced off */
1388 1388 if (S_ISFENCED(sp))
1389 1389 return (ENXIO);
1390 1390
1391 1391 if (vp->v_type == VCHR && vp->v_stream && (vap->va_mask & AT_SIZE)) {
1392 1392 /*
1393 1393 * 1135080: O_TRUNC should have no effect on
1394 1394 * named pipes and terminal devices.
1395 1395 */
1396 1396 ASSERT(vap->va_mask == AT_SIZE);
1397 1397 return (0);
1398 1398 }
1399 1399
1400 1400 if ((realvp = sp->s_realvp) == NULL)
1401 1401 error = 0; /* no real vnode to update */
1402 1402 else
1403 1403 error = VOP_SETATTR(realvp, vap, flags, cr, ct);
1404 1404 if (error == 0) {
1405 1405 /*
1406 1406 * If times were changed, update snode.
1407 1407 */
1408 1408 mutex_enter(&sp->s_lock);
1409 1409 if (vap->va_mask & AT_ATIME)
1410 1410 sp->s_atime = vap->va_atime.tv_sec;
1411 1411 if (vap->va_mask & AT_MTIME) {
1412 1412 sp->s_mtime = vap->va_mtime.tv_sec;
1413 1413 sp->s_ctime = gethrestime_sec();
1414 1414 }
1415 1415 mutex_exit(&sp->s_lock);
1416 1416 }
1417 1417 return (error);
1418 1418 }
1419 1419
1420 1420 static int
1421 1421 spec_access(
1422 1422 struct vnode *vp,
1423 1423 int mode,
1424 1424 int flags,
1425 1425 struct cred *cr,
1426 1426 caller_context_t *ct)
1427 1427 {
1428 1428 struct vnode *realvp;
1429 1429 struct snode *sp = VTOS(vp);
1430 1430
1431 1431 /* fail with ENXIO if the device is fenced off */
1432 1432 if (S_ISFENCED(sp))
1433 1433 return (ENXIO);
1434 1434
1435 1435 if ((realvp = sp->s_realvp) != NULL)
1436 1436 return (VOP_ACCESS(realvp, mode, flags, cr, ct));
1437 1437 else
1438 1438 return (0); /* Allow all access. */
1439 1439 }
1440 1440
1441 1441 /*
1442 1442 * This can be called if creat or an open with O_CREAT is done on the root
1443 1443 * of a lofs mount where the mounted entity is a special file.
1444 1444 */
1445 1445 /*ARGSUSED*/
1446 1446 static int
1447 1447 spec_create(
1448 1448 struct vnode *dvp,
1449 1449 char *name,
1450 1450 vattr_t *vap,
1451 1451 enum vcexcl excl,
1452 1452 int mode,
1453 1453 struct vnode **vpp,
1454 1454 struct cred *cr,
1455 1455 int flag,
1456 1456 caller_context_t *ct,
1457 1457 vsecattr_t *vsecp)
1458 1458 {
1459 1459 int error;
1460 1460 struct snode *sp = VTOS(dvp);
1461 1461
1462 1462 /* fail with ENXIO if the device is fenced off */
1463 1463 if (S_ISFENCED(sp))
1464 1464 return (ENXIO);
1465 1465
1466 1466 ASSERT(dvp && (dvp->v_flag & VROOT) && *name == '\0');
1467 1467 if (excl == NONEXCL) {
1468 1468 if (mode && (error = spec_access(dvp, mode, 0, cr, ct)))
1469 1469 return (error);
1470 1470 VN_HOLD(dvp);
1471 1471 return (0);
1472 1472 }
1473 1473 return (EEXIST);
1474 1474 }
1475 1475
1476 1476 /*
1477 1477 * In order to sync out the snode times without multi-client problems,
1478 1478 * make sure the times written out are never earlier than the times
1479 1479 * already set in the vnode.
1480 1480 */
1481 1481 static int
1482 1482 spec_fsync(
1483 1483 struct vnode *vp,
1484 1484 int syncflag,
1485 1485 struct cred *cr,
1486 1486 caller_context_t *ct)
1487 1487 {
1488 1488 struct snode *sp = VTOS(vp);
1489 1489 struct vnode *realvp;
1490 1490 struct vnode *cvp;
1491 1491 struct vattr va, vatmp;
1492 1492
1493 1493 /* allow syncing even if device is fenced off */
1494 1494
1495 1495 /* If times didn't change, don't flush anything. */
1496 1496 mutex_enter(&sp->s_lock);
1497 1497 if ((sp->s_flag & (SACC|SUPD|SCHG)) == 0 && vp->v_type != VBLK) {
1498 1498 mutex_exit(&sp->s_lock);
1499 1499 return (0);
1500 1500 }
1501 1501 sp->s_flag &= ~(SACC|SUPD|SCHG);
1502 1502 mutex_exit(&sp->s_lock);
1503 1503 cvp = sp->s_commonvp;
1504 1504 realvp = sp->s_realvp;
1505 1505
1506 1506 if (vp->v_type == VBLK && cvp != vp && vn_has_cached_data(cvp) &&
1507 1507 (cvp->v_flag & VISSWAP) == 0)
1508 1508 (void) VOP_PUTPAGE(cvp, (offset_t)0, 0, 0, cr, ct);
1509 1509
1510 1510 /*
1511 1511 * For devices that support it, force write cache to stable storage.
1512 1512 * We don't need the lock to check s_flags since we can treat
1513 1513 * SNOFLUSH as a hint.
1514 1514 */
1515 1515 if ((vp->v_type == VBLK || vp->v_type == VCHR) &&
1516 1516 !(sp->s_flag & SNOFLUSH)) {
1517 1517 int rval, rc;
1518 1518 struct dk_callback spec_callback;
1519 1519
1520 1520 spec_callback.dkc_flag = FLUSH_VOLATILE;
1521 1521 spec_callback.dkc_callback = NULL;
1522 1522
1523 1523 /* synchronous flush on volatile cache */
1524 1524 rc = cdev_ioctl(vp->v_rdev, DKIOCFLUSHWRITECACHE,
1525 1525 (intptr_t)&spec_callback, FNATIVE|FKIOCTL, cr, &rval);
1526 1526
1527 1527 if (rc == ENOTSUP || rc == ENOTTY) {
1528 1528 mutex_enter(&sp->s_lock);
1529 1529 sp->s_flag |= SNOFLUSH;
1530 1530 mutex_exit(&sp->s_lock);
1531 1531 }
1532 1532 }
1533 1533
1534 1534 /*
1535 1535 * If no real vnode to update, don't flush anything.
1536 1536 */
1537 1537 if (realvp == NULL)
1538 1538 return (0);
1539 1539
1540 1540 vatmp.va_mask = AT_ATIME|AT_MTIME;
1541 1541 if (VOP_GETATTR(realvp, &vatmp, 0, cr, ct) == 0) {
1542 1542
1543 1543 mutex_enter(&sp->s_lock);
1544 1544 if (vatmp.va_atime.tv_sec > sp->s_atime)
1545 1545 va.va_atime = vatmp.va_atime;
1546 1546 else {
1547 1547 va.va_atime.tv_sec = sp->s_atime;
1548 1548 va.va_atime.tv_nsec = 0;
1549 1549 }
1550 1550 if (vatmp.va_mtime.tv_sec > sp->s_mtime)
1551 1551 va.va_mtime = vatmp.va_mtime;
1552 1552 else {
1553 1553 va.va_mtime.tv_sec = sp->s_mtime;
1554 1554 va.va_mtime.tv_nsec = 0;
1555 1555 }
1556 1556 mutex_exit(&sp->s_lock);
1557 1557
1558 1558 va.va_mask = AT_ATIME|AT_MTIME;
1559 1559 (void) VOP_SETATTR(realvp, &va, 0, cr, ct);
1560 1560 }
1561 1561 (void) VOP_FSYNC(realvp, syncflag, cr, ct);
1562 1562 return (0);
1563 1563 }
1564 1564
1565 1565 /*ARGSUSED*/
1566 1566 static void
1567 1567 spec_inactive(struct vnode *vp, struct cred *cr, caller_context_t *ct)
1568 1568 {
1569 1569 struct snode *sp = VTOS(vp);
1570 1570 struct vnode *cvp;
1571 1571 struct vnode *rvp;
1572 1572
1573 1573 /*
1574 1574 * If no one has reclaimed the vnode, remove from the
1575 1575 * cache now.
1576 1576 */
1577 1577 if (vp->v_count < 1) {
1578 1578 panic("spec_inactive: Bad v_count");
1579 1579 /*NOTREACHED*/
1580 1580 }
1581 1581 mutex_enter(&stable_lock);
1582 1582
1583 1583 mutex_enter(&vp->v_lock);
1584 1584 /*
1585 1585 * Drop the temporary hold by vn_rele now
1586 1586 */
1587 1587 if (--vp->v_count != 0) {
1588 1588 mutex_exit(&vp->v_lock);
1589 1589 mutex_exit(&stable_lock);
1590 1590 return;
1591 1591 }
1592 1592 mutex_exit(&vp->v_lock);
1593 1593
1594 1594 sdelete(sp);
1595 1595 mutex_exit(&stable_lock);
1596 1596
1597 1597 /* We are the sole owner of sp now */
1598 1598 cvp = sp->s_commonvp;
1599 1599 rvp = sp->s_realvp;
1600 1600
1601 1601 if (rvp) {
1602 1602 /*
1603 1603 * If the snode times changed, then update the times
1604 1604 * associated with the "realvp".
1605 1605 */
1606 1606 if ((sp->s_flag & (SACC|SUPD|SCHG)) != 0) {
1607 1607
1608 1608 struct vattr va, vatmp;
1609 1609
1610 1610 mutex_enter(&sp->s_lock);
1611 1611 sp->s_flag &= ~(SACC|SUPD|SCHG);
1612 1612 mutex_exit(&sp->s_lock);
1613 1613 vatmp.va_mask = AT_ATIME|AT_MTIME;
1614 1614 /*
1615 1615 * The user may not own the device, but we
1616 1616 * want to update the attributes anyway.
1617 1617 */
1618 1618 if (VOP_GETATTR(rvp, &vatmp, 0, kcred, ct) == 0) {
1619 1619 if (vatmp.va_atime.tv_sec > sp->s_atime)
1620 1620 va.va_atime = vatmp.va_atime;
1621 1621 else {
1622 1622 va.va_atime.tv_sec = sp->s_atime;
1623 1623 va.va_atime.tv_nsec = 0;
1624 1624 }
1625 1625 if (vatmp.va_mtime.tv_sec > sp->s_mtime)
1626 1626 va.va_mtime = vatmp.va_mtime;
1627 1627 else {
1628 1628 va.va_mtime.tv_sec = sp->s_mtime;
1629 1629 va.va_mtime.tv_nsec = 0;
1630 1630 }
1631 1631
1632 1632 va.va_mask = AT_ATIME|AT_MTIME;
1633 1633 (void) VOP_SETATTR(rvp, &va, 0, kcred, ct);
1634 1634 }
1635 1635 }
1636 1636 }
1637 1637 ASSERT(!vn_has_cached_data(vp));
1638 1638 vn_invalid(vp);
1639 1639
1640 1640 /* if we are sharing another file systems vfs, release it */
1641 1641 if (vp->v_vfsp && (vp->v_vfsp != &spec_vfs))
1642 1642 VFS_RELE(vp->v_vfsp);
1643 1643
1644 1644 /* if we have a realvp, release the realvp */
1645 1645 if (rvp)
1646 1646 VN_RELE(rvp);
1647 1647
1648 1648 /* if we have a common, release the common */
1649 1649 if (cvp && (cvp != vp)) {
1650 1650 VN_RELE(cvp);
1651 1651 #ifdef DEBUG
1652 1652 } else if (cvp) {
1653 1653 /*
1654 1654 * if this is the last reference to a common vnode, any
1655 1655 * associated stream had better have been closed
1656 1656 */
1657 1657 ASSERT(cvp == vp);
1658 1658 ASSERT(cvp->v_stream == NULL);
1659 1659 #endif /* DEBUG */
1660 1660 }
1661 1661
1662 1662 /*
1663 1663 * if we have a hold on a devinfo node (established by
1664 1664 * spec_assoc_vp_with_devi), release the hold
1665 1665 */
1666 1666 if (sp->s_dip)
1667 1667 ddi_release_devi(sp->s_dip);
1668 1668
1669 1669 /*
1670 1670 * If we have an associated device policy, release it.
1671 1671 */
1672 1672 if (sp->s_plcy != NULL)
1673 1673 dpfree(sp->s_plcy);
1674 1674
1675 1675 /*
1676 1676 * If all holds on the devinfo node are through specfs/devfs
1677 1677 * and we just destroyed the last specfs node associated with the
1678 1678 * device, then the devinfo node reference count should now be
1679 1679 * zero. We can't check this because there may be other holds
1680 1680 * on the node from non file system sources: ddi_hold_devi_by_instance
1681 1681 * for example.
1682 1682 */
1683 1683 kmem_cache_free(snode_cache, sp);
1684 1684 }
1685 1685
1686 1686 static int
1687 1687 spec_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct)
1688 1688 {
1689 1689 struct vnode *realvp;
1690 1690 struct snode *sp = VTOS(vp);
1691 1691
1692 1692 if ((realvp = sp->s_realvp) != NULL)
1693 1693 return (VOP_FID(realvp, fidp, ct));
1694 1694 else
1695 1695 return (EINVAL);
1696 1696 }
1697 1697
1698 1698 /*ARGSUSED1*/
1699 1699 static int
1700 1700 spec_seek(
1701 1701 struct vnode *vp,
1702 1702 offset_t ooff,
1703 1703 offset_t *noffp,
1704 1704 caller_context_t *ct)
1705 1705 {
1706 1706 offset_t maxoff = spec_maxoffset(vp);
1707 1707
1708 1708 if (maxoff == -1 || *noffp <= maxoff)
1709 1709 return (0);
1710 1710 else
1711 1711 return (EINVAL);
1712 1712 }
1713 1713
1714 1714 static int
1715 1715 spec_frlock(
1716 1716 struct vnode *vp,
1717 1717 int cmd,
1718 1718 struct flock64 *bfp,
1719 1719 int flag,
1720 1720 offset_t offset,
1721 1721 struct flk_callback *flk_cbp,
1722 1722 struct cred *cr,
1723 1723 caller_context_t *ct)
1724 1724 {
1725 1725 struct snode *sp = VTOS(vp);
1726 1726 struct snode *csp;
1727 1727
1728 1728 csp = VTOS(sp->s_commonvp);
1729 1729 /*
1730 1730 * If file is being mapped, disallow frlock.
1731 1731 */
1732 1732 if (csp->s_mapcnt > 0)
1733 1733 return (EAGAIN);
1734 1734
1735 1735 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct));
1736 1736 }
1737 1737
1738 1738 static int
1739 1739 spec_realvp(struct vnode *vp, struct vnode **vpp, caller_context_t *ct)
1740 1740 {
1741 1741 struct vnode *rvp;
1742 1742
1743 1743 if ((rvp = VTOS(vp)->s_realvp) != NULL) {
1744 1744 vp = rvp;
1745 1745 if (VOP_REALVP(vp, &rvp, ct) == 0)
1746 1746 vp = rvp;
1747 1747 }
1748 1748
1749 1749 *vpp = vp;
1750 1750 return (0);
1751 1751 }
1752 1752
1753 1753 /*
1754 1754 * Return all the pages from [off..off + len] in block
1755 1755 * or character device.
1756 1756 */
1757 1757 /*ARGSUSED*/
1758 1758 static int
1759 1759 spec_getpage(
1760 1760 struct vnode *vp,
1761 1761 offset_t off,
1762 1762 size_t len,
1763 1763 uint_t *protp,
1764 1764 page_t *pl[],
1765 1765 size_t plsz,
1766 1766 struct seg *seg,
1767 1767 caddr_t addr,
1768 1768 enum seg_rw rw,
1769 1769 struct cred *cr,
1770 1770 caller_context_t *ct)
1771 1771 {
1772 1772 struct snode *sp = VTOS(vp);
1773 1773 int err;
1774 1774
1775 1775 ASSERT(sp->s_commonvp == vp);
1776 1776
1777 1777 /*
1778 1778 * XXX Given the above assertion, this might not do
1779 1779 * what is wanted here.
1780 1780 */
1781 1781 if (vp->v_flag & VNOMAP)
1782 1782 return (ENOSYS);
1783 1783 TRACE_4(TR_FAC_SPECFS, TR_SPECFS_GETPAGE,
1784 1784 "specfs getpage:vp %p off %llx len %ld snode %p",
1785 1785 vp, off, len, sp);
1786 1786
1787 1787 switch (vp->v_type) {
1788 1788 case VBLK:
1789 1789 if (protp != NULL)
1790 1790 *protp = PROT_ALL;
1791 1791
1792 1792 if (((u_offset_t)off + len) > (SPEC_SIZE(sp) + PAGEOFFSET))
1793 1793 return (EFAULT); /* beyond EOF */
1794 1794
1795 1795 err = pvn_getpages(spec_getapage, vp, (u_offset_t)off, len,
1796 1796 protp, pl, plsz, seg, addr, rw, cr);
1797 1797 break;
1798 1798
1799 1799 case VCHR:
1800 1800 cmn_err(CE_NOTE, "spec_getpage called for character device. "
1801 1801 "Check any non-ON consolidation drivers");
1802 1802 err = 0;
1803 1803 pl[0] = (page_t *)0;
1804 1804 break;
1805 1805
1806 1806 default:
1807 1807 panic("spec_getpage: bad v_type 0x%x", vp->v_type);
1808 1808 /*NOTREACHED*/
1809 1809 }
1810 1810
1811 1811 return (err);
1812 1812 }
1813 1813
1814 1814 extern int klustsize; /* set in machdep.c */
1815 1815
1816 1816 int spec_ra = 1;
1817 1817 int spec_lostpage; /* number of times we lost original page */
1818 1818
1819 1819 /*ARGSUSED2*/
1820 1820 static int
1821 1821 spec_getapage(
1822 1822 struct vnode *vp,
1823 1823 u_offset_t off,
1824 1824 size_t len,
1825 1825 uint_t *protp,
1826 1826 page_t *pl[],
1827 1827 size_t plsz,
1828 1828 struct seg *seg,
1829 1829 caddr_t addr,
1830 1830 enum seg_rw rw,
1831 1831 struct cred *cr)
1832 1832 {
1833 1833 struct snode *sp;
1834 1834 struct buf *bp;
1835 1835 page_t *pp, *pp2;
1836 1836 u_offset_t io_off1, io_off2;
1837 1837 size_t io_len1;
1838 1838 size_t io_len2;
1839 1839 size_t blksz;
1840 1840 u_offset_t blkoff;
1841 1841 int dora, err;
1842 1842 page_t *pagefound;
1843 1843 uint_t xlen;
1844 1844 size_t adj_klustsize;
1845 1845 u_offset_t size;
1846 1846 u_offset_t tmpoff;
1847 1847
1848 1848 sp = VTOS(vp);
1849 1849 TRACE_3(TR_FAC_SPECFS, TR_SPECFS_GETAPAGE,
1850 1850 "specfs getapage:vp %p off %llx snode %p", vp, off, sp);
1851 1851 reread:
1852 1852
1853 1853 err = 0;
1854 1854 bp = NULL;
1855 1855 pp = NULL;
1856 1856 pp2 = NULL;
1857 1857
1858 1858 if (pl != NULL)
1859 1859 pl[0] = NULL;
1860 1860
1861 1861 size = SPEC_SIZE(VTOS(sp->s_commonvp));
1862 1862
1863 1863 if (spec_ra && sp->s_nextr == off)
1864 1864 dora = 1;
1865 1865 else
1866 1866 dora = 0;
1867 1867
1868 1868 if (size == UNKNOWN_SIZE) {
1869 1869 dora = 0;
1870 1870 adj_klustsize = PAGESIZE;
1871 1871 } else {
1872 1872 adj_klustsize = dora ? klustsize : PAGESIZE;
1873 1873 }
1874 1874
1875 1875 again:
1876 1876 if ((pagefound = page_exists(vp, off)) == NULL) {
1877 1877 if (rw == S_CREATE) {
1878 1878 /*
1879 1879 * We're allocating a swap slot and it's
1880 1880 * associated page was not found, so allocate
1881 1881 * and return it.
1882 1882 */
1883 1883 if ((pp = page_create_va(vp, off,
1884 1884 PAGESIZE, PG_WAIT, seg, addr)) == NULL) {
1885 1885 panic("spec_getapage: page_create");
1886 1886 /*NOTREACHED*/
1887 1887 }
1888 1888 io_len1 = PAGESIZE;
1889 1889 sp->s_nextr = off + PAGESIZE;
1890 1890 } else {
1891 1891 /*
1892 1892 * Need to really do disk I/O to get the page(s).
1893 1893 */
1894 1894 blkoff = (off / adj_klustsize) * adj_klustsize;
1895 1895 if (size == UNKNOWN_SIZE) {
1896 1896 blksz = PAGESIZE;
1897 1897 } else {
1898 1898 if (blkoff + adj_klustsize <= size)
1899 1899 blksz = adj_klustsize;
1900 1900 else
1901 1901 blksz =
1902 1902 MIN(size - blkoff, adj_klustsize);
1903 1903 }
1904 1904
1905 1905 pp = pvn_read_kluster(vp, off, seg, addr, &tmpoff,
1906 1906 &io_len1, blkoff, blksz, 0);
1907 1907 io_off1 = tmpoff;
1908 1908 /*
1909 1909 * Make sure the page didn't sneek into the
1910 1910 * cache while we blocked in pvn_read_kluster.
1911 1911 */
1912 1912 if (pp == NULL)
1913 1913 goto again;
1914 1914
1915 1915 /*
1916 1916 * Zero part of page which we are not
1917 1917 * going to be reading from disk now.
1918 1918 */
1919 1919 xlen = (uint_t)(io_len1 & PAGEOFFSET);
1920 1920 if (xlen != 0)
1921 1921 pagezero(pp->p_prev, xlen, PAGESIZE - xlen);
1922 1922
1923 1923 bp = spec_startio(vp, pp, io_off1, io_len1,
1924 1924 pl == NULL ? (B_ASYNC | B_READ) : B_READ);
1925 1925 sp->s_nextr = io_off1 + io_len1;
1926 1926 }
1927 1927 }
1928 1928
1929 1929 if (dora && rw != S_CREATE) {
1930 1930 u_offset_t off2;
1931 1931 caddr_t addr2;
1932 1932
1933 1933 off2 = ((off / adj_klustsize) + 1) * adj_klustsize;
1934 1934 addr2 = addr + (off2 - off);
1935 1935
1936 1936 pp2 = NULL;
1937 1937 /*
1938 1938 * If we are past EOF then don't bother trying
1939 1939 * with read-ahead.
1940 1940 */
1941 1941 if (off2 >= size)
1942 1942 pp2 = NULL;
1943 1943 else {
1944 1944 if (off2 + adj_klustsize <= size)
1945 1945 blksz = adj_klustsize;
1946 1946 else
1947 1947 blksz = MIN(size - off2, adj_klustsize);
1948 1948
1949 1949 pp2 = pvn_read_kluster(vp, off2, seg, addr2, &tmpoff,
1950 1950 &io_len2, off2, blksz, 1);
1951 1951 io_off2 = tmpoff;
1952 1952 }
1953 1953
1954 1954 if (pp2 != NULL) {
1955 1955 /*
1956 1956 * Zero part of page which we are not
1957 1957 * going to be reading from disk now.
1958 1958 */
1959 1959 xlen = (uint_t)(io_len2 & PAGEOFFSET);
1960 1960 if (xlen != 0)
1961 1961 pagezero(pp2->p_prev, xlen, PAGESIZE - xlen);
1962 1962
1963 1963 (void) spec_startio(vp, pp2, io_off2, io_len2,
1964 1964 B_READ | B_ASYNC);
1965 1965 }
1966 1966 }
1967 1967
1968 1968 if (pl == NULL)
1969 1969 return (err);
1970 1970
1971 1971 if (bp != NULL) {
1972 1972 err = biowait(bp);
1973 1973 pageio_done(bp);
1974 1974
1975 1975 if (err) {
1976 1976 if (pp != NULL)
1977 1977 pvn_read_done(pp, B_ERROR);
1978 1978 return (err);
1979 1979 }
1980 1980 }
1981 1981
1982 1982 if (pagefound) {
1983 1983 se_t se = (rw == S_CREATE ? SE_EXCL : SE_SHARED);
1984 1984 /*
1985 1985 * Page exists in the cache, acquire the appropriate
1986 1986 * lock. If this fails, start all over again.
1987 1987 */
1988 1988
1989 1989 if ((pp = page_lookup(vp, off, se)) == NULL) {
1990 1990 spec_lostpage++;
1991 1991 goto reread;
1992 1992 }
1993 1993 pl[0] = pp;
1994 1994 pl[1] = NULL;
1995 1995
1996 1996 sp->s_nextr = off + PAGESIZE;
1997 1997 return (0);
1998 1998 }
1999 1999
2000 2000 if (pp != NULL)
2001 2001 pvn_plist_init(pp, pl, plsz, off, io_len1, rw);
2002 2002 return (0);
2003 2003 }
2004 2004
2005 2005 /*
2006 2006 * Flags are composed of {B_INVAL, B_DIRTY B_FREE, B_DONTNEED, B_FORCE}.
2007 2007 * If len == 0, do from off to EOF.
2008 2008 *
2009 2009 * The normal cases should be len == 0 & off == 0 (entire vp list),
2010 2010 * len == MAXBSIZE (from segmap_release actions), and len == PAGESIZE
2011 2011 * (from pageout).
2012 2012 */
2013 2013 /*ARGSUSED5*/
2014 2014 int
2015 2015 spec_putpage(
2016 2016 struct vnode *vp,
2017 2017 offset_t off,
2018 2018 size_t len,
2019 2019 int flags,
2020 2020 struct cred *cr,
2021 2021 caller_context_t *ct)
2022 2022 {
2023 2023 struct snode *sp = VTOS(vp);
2024 2024 struct vnode *cvp;
2025 2025 page_t *pp;
2026 2026 u_offset_t io_off;
2027 2027 size_t io_len = 0; /* for lint */
2028 2028 int err = 0;
2029 2029 u_offset_t size;
2030 2030 u_offset_t tmpoff;
2031 2031
2032 2032 ASSERT(vp->v_count != 0);
2033 2033
2034 2034 if (vp->v_flag & VNOMAP)
2035 2035 return (ENOSYS);
2036 2036
2037 2037 cvp = sp->s_commonvp;
2038 2038 size = SPEC_SIZE(VTOS(cvp));
2039 2039
2040 2040 if (!vn_has_cached_data(vp) || off >= size)
2041 2041 return (0);
2042 2042
2043 2043 ASSERT(vp->v_type == VBLK && cvp == vp);
2044 2044 TRACE_4(TR_FAC_SPECFS, TR_SPECFS_PUTPAGE,
2045 2045 "specfs putpage:vp %p off %llx len %ld snode %p",
2046 2046 vp, off, len, sp);
2047 2047
2048 2048 if (len == 0) {
2049 2049 /*
2050 2050 * Search the entire vp list for pages >= off.
2051 2051 */
2052 2052 err = pvn_vplist_dirty(vp, off, spec_putapage,
2053 2053 flags, cr);
2054 2054 } else {
2055 2055 u_offset_t eoff;
2056 2056
2057 2057 /*
2058 2058 * Loop over all offsets in the range [off...off + len]
2059 2059 * looking for pages to deal with. We set limits so
2060 2060 * that we kluster to klustsize boundaries.
2061 2061 */
2062 2062 eoff = off + len;
2063 2063 for (io_off = off; io_off < eoff && io_off < size;
2064 2064 io_off += io_len) {
2065 2065 /*
2066 2066 * If we are not invalidating, synchronously
2067 2067 * freeing or writing pages use the routine
2068 2068 * page_lookup_nowait() to prevent reclaiming
2069 2069 * them from the free list.
2070 2070 */
2071 2071 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) {
2072 2072 pp = page_lookup(vp, io_off,
2073 2073 (flags & (B_INVAL | B_FREE)) ?
2074 2074 SE_EXCL : SE_SHARED);
2075 2075 } else {
2076 2076 pp = page_lookup_nowait(vp, io_off,
2077 2077 (flags & B_FREE) ? SE_EXCL : SE_SHARED);
2078 2078 }
2079 2079
2080 2080 if (pp == NULL || pvn_getdirty(pp, flags) == 0)
2081 2081 io_len = PAGESIZE;
2082 2082 else {
2083 2083 err = spec_putapage(vp, pp, &tmpoff, &io_len,
2084 2084 flags, cr);
2085 2085 io_off = tmpoff;
2086 2086 if (err != 0)
2087 2087 break;
2088 2088 /*
2089 2089 * "io_off" and "io_len" are returned as
2090 2090 * the range of pages we actually wrote.
2091 2091 * This allows us to skip ahead more quickly
2092 2092 * since several pages may've been dealt
2093 2093 * with by this iteration of the loop.
2094 2094 */
2095 2095 }
2096 2096 }
2097 2097 }
2098 2098 return (err);
2099 2099 }
2100 2100
2101 2101
2102 2102 /*
2103 2103 * Write out a single page, possibly klustering adjacent
2104 2104 * dirty pages.
2105 2105 */
2106 2106 /*ARGSUSED5*/
2107 2107 static int
2108 2108 spec_putapage(
2109 2109 struct vnode *vp,
2110 2110 page_t *pp,
2111 2111 u_offset_t *offp, /* return value */
2112 2112 size_t *lenp, /* return value */
2113 2113 int flags,
2114 2114 struct cred *cr)
2115 2115 {
2116 2116 struct snode *sp = VTOS(vp);
2117 2117 u_offset_t io_off;
2118 2118 size_t io_len;
2119 2119 size_t blksz;
2120 2120 u_offset_t blkoff;
2121 2121 int err = 0;
2122 2122 struct buf *bp;
2123 2123 u_offset_t size;
2124 2124 size_t adj_klustsize;
2125 2125 u_offset_t tmpoff;
2126 2126
2127 2127 /*
2128 2128 * Destroy read ahead value since we are really going to write.
2129 2129 */
2130 2130 sp->s_nextr = 0;
2131 2131 size = SPEC_SIZE(VTOS(sp->s_commonvp));
2132 2132
2133 2133 adj_klustsize = klustsize;
2134 2134
2135 2135 blkoff = (pp->p_offset / adj_klustsize) * adj_klustsize;
2136 2136
2137 2137 if (blkoff + adj_klustsize <= size)
2138 2138 blksz = adj_klustsize;
2139 2139 else
2140 2140 blksz = size - blkoff;
2141 2141
2142 2142 /*
2143 2143 * Find a kluster that fits in one contiguous chunk.
2144 2144 */
2145 2145 pp = pvn_write_kluster(vp, pp, &tmpoff, &io_len, blkoff,
2146 2146 blksz, flags);
2147 2147 io_off = tmpoff;
2148 2148
2149 2149 /*
2150 2150 * Check for page length rounding problems
2151 2151 * XXX - Is this necessary?
2152 2152 */
2153 2153 if (io_off + io_len > size) {
2154 2154 ASSERT((io_off + io_len) - size < PAGESIZE);
2155 2155 io_len = size - io_off;
2156 2156 }
2157 2157
2158 2158 bp = spec_startio(vp, pp, io_off, io_len, B_WRITE | flags);
2159 2159
2160 2160 /*
2161 2161 * Wait for i/o to complete if the request is not B_ASYNC.
2162 2162 */
2163 2163 if ((flags & B_ASYNC) == 0) {
2164 2164 err = biowait(bp);
2165 2165 pageio_done(bp);
2166 2166 pvn_write_done(pp, ((err) ? B_ERROR : 0) | B_WRITE | flags);
2167 2167 }
2168 2168
2169 2169 if (offp)
2170 2170 *offp = io_off;
2171 2171 if (lenp)
2172 2172 *lenp = io_len;
2173 2173 TRACE_4(TR_FAC_SPECFS, TR_SPECFS_PUTAPAGE,
2174 2174 "specfs putapage:vp %p offp %p snode %p err %d",
2175 2175 vp, offp, sp, err);
2176 2176 return (err);
2177 2177 }
2178 2178
2179 2179 /*
2180 2180 * Flags are composed of {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED}
2181 2181 */
2182 2182 static struct buf *
2183 2183 spec_startio(
2184 2184 struct vnode *vp,
2185 2185 page_t *pp,
2186 2186 u_offset_t io_off,
2187 2187 size_t io_len,
2188 2188 int flags)
2189 2189 {
2190 2190 struct buf *bp;
2191 2191
2192 2192 bp = pageio_setup(pp, io_len, vp, flags);
2193 2193
2194 2194 bp->b_edev = vp->v_rdev;
2195 2195 bp->b_dev = cmpdev(vp->v_rdev);
2196 2196 bp->b_blkno = btodt(io_off);
2197 2197 bp->b_un.b_addr = (caddr_t)0;
2198 2198
2199 2199 (void) bdev_strategy(bp);
2200 2200
2201 2201 if (flags & B_READ)
2202 2202 lwp_stat_update(LWP_STAT_INBLK, 1);
2203 2203 else
2204 2204 lwp_stat_update(LWP_STAT_OUBLK, 1);
2205 2205
2206 2206 return (bp);
2207 2207 }
2208 2208
2209 2209 static int
2210 2210 spec_poll(
2211 2211 struct vnode *vp,
2212 2212 short events,
2213 2213 int anyyet,
2214 2214 short *reventsp,
2215 2215 struct pollhead **phpp,
2216 2216 caller_context_t *ct)
2217 2217 {
2218 2218 dev_t dev;
2219 2219 int error;
2220 2220
2221 2221 if (vp->v_type == VBLK)
2222 2222 error = fs_poll(vp, events, anyyet, reventsp, phpp, ct);
2223 2223 else {
2224 2224 ASSERT(vp->v_type == VCHR);
2225 2225 dev = vp->v_rdev;
2226 2226 if (vp->v_stream) {
2227 2227 ASSERT(vp->v_stream != NULL);
2228 2228 error = strpoll(vp->v_stream, events, anyyet,
2229 2229 reventsp, phpp);
2230 2230 } else if (devopsp[getmajor(dev)]->devo_cb_ops->cb_chpoll) {
2231 2231 error = cdev_poll(dev, events, anyyet, reventsp, phpp);
2232 2232 } else {
2233 2233 error = fs_poll(vp, events, anyyet, reventsp, phpp, ct);
2234 2234 }
2235 2235 }
2236 2236 return (error);
2237 2237 }
2238 2238
2239 2239 /*
2240 2240 * This routine is called through the cdevsw[] table to handle
2241 2241 * traditional mmap'able devices that support a d_mmap function.
2242 2242 */
2243 2243 /*ARGSUSED8*/
2244 2244 int
2245 2245 spec_segmap(
2246 2246 dev_t dev,
2247 2247 off_t off,
2248 2248 struct as *as,
2249 2249 caddr_t *addrp,
2250 2250 off_t len,
2251 2251 uint_t prot,
2252 2252 uint_t maxprot,
2253 2253 uint_t flags,
2254 2254 struct cred *cred)
2255 2255 {
2256 2256 struct segdev_crargs dev_a;
2257 2257 int (*mapfunc)(dev_t dev, off_t off, int prot);
2258 2258 size_t i;
2259 2259 int error;
2260 2260
2261 2261 if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev)
2262 2262 return (ENODEV);
2263 2263 TRACE_4(TR_FAC_SPECFS, TR_SPECFS_SEGMAP,
2264 2264 "specfs segmap:dev %x as %p len %lx prot %x",
2265 2265 dev, as, len, prot);
2266 2266
2267 2267 /*
2268 2268 * Character devices that support the d_mmap
2269 2269 * interface can only be mmap'ed shared.
2270 2270 */
2271 2271 if ((flags & MAP_TYPE) != MAP_SHARED)
2272 2272 return (EINVAL);
2273 2273
2274 2274 /*
2275 2275 * Check to ensure that the entire range is
2276 2276 * legal and we are not trying to map in
2277 2277 * more than the device will let us.
2278 2278 */
2279 2279 for (i = 0; i < len; i += PAGESIZE) {
2280 2280 if (cdev_mmap(mapfunc, dev, off + i, maxprot) == -1)
2281 2281 return (ENXIO);
2282 2282 }
2283 2283
2284 2284 as_rangelock(as);
2285 2285 /* Pick an address w/o worrying about any vac alignment constraints. */
2286 2286 error = choose_addr(as, addrp, len, off, ADDR_NOVACALIGN, flags);
2287 2287 if (error != 0) {
2288 2288 as_rangeunlock(as);
2289 2289 return (error);
2290 2290 }
2291 2291
2292 2292 dev_a.mapfunc = mapfunc;
2293 2293 dev_a.dev = dev;
2294 2294 dev_a.offset = off;
2295 2295 dev_a.prot = (uchar_t)prot;
2296 2296 dev_a.maxprot = (uchar_t)maxprot;
2297 2297 dev_a.hat_flags = 0;
2298 2298 dev_a.hat_attr = 0;
2299 2299 dev_a.devmap_data = NULL;
2300 2300
2301 2301 error = as_map(as, *addrp, len, segdev_create, &dev_a);
2302 2302 as_rangeunlock(as);
2303 2303 return (error);
2304 2304 }
2305 2305
2306 2306 int
2307 2307 spec_char_map(
2308 2308 dev_t dev,
2309 2309 offset_t off,
2310 2310 struct as *as,
2311 2311 caddr_t *addrp,
2312 2312 size_t len,
2313 2313 uchar_t prot,
2314 2314 uchar_t maxprot,
2315 2315 uint_t flags,
2316 2316 struct cred *cred)
2317 2317 {
2318 2318 int error = 0;
2319 2319 major_t maj = getmajor(dev);
2320 2320 int map_flag;
2321 2321 int (*segmap)(dev_t, off_t, struct as *,
2322 2322 caddr_t *, off_t, uint_t, uint_t, uint_t, cred_t *);
2323 2323 int (*devmap)(dev_t, devmap_cookie_t, offset_t,
2324 2324 size_t, size_t *, uint_t);
2325 2325 int (*mmap)(dev_t dev, off_t off, int prot);
2326 2326
2327 2327 /*
2328 2328 * Character device: let the device driver
2329 2329 * pick the appropriate segment driver.
2330 2330 *
2331 2331 * 4.x compat.: allow 'NULL' cb_segmap => spec_segmap
2332 2332 * Kindness: allow 'nulldev' cb_segmap => spec_segmap
2333 2333 */
2334 2334 segmap = devopsp[maj]->devo_cb_ops->cb_segmap;
2335 2335 if (segmap == NULL || segmap == nulldev || segmap == nodev) {
2336 2336 mmap = devopsp[maj]->devo_cb_ops->cb_mmap;
2337 2337 map_flag = devopsp[maj]->devo_cb_ops->cb_flag;
2338 2338
2339 2339 /*
2340 2340 * Use old mmap framework if the driver has both mmap
2341 2341 * and devmap entry points. This is to prevent the
2342 2342 * system from calling invalid devmap entry point
2343 2343 * for some drivers that might have put garbage in the
2344 2344 * devmap entry point.
2345 2345 */
2346 2346 if ((map_flag & D_DEVMAP) || mmap == NULL ||
2347 2347 mmap == nulldev || mmap == nodev) {
2348 2348 devmap = devopsp[maj]->devo_cb_ops->cb_devmap;
2349 2349
2350 2350 /*
2351 2351 * If driver provides devmap entry point in
2352 2352 * cb_ops but not xx_segmap(9E), call
2353 2353 * devmap_setup with default settings
2354 2354 * (NULL) for callback_ops and driver
2355 2355 * callback private data
2356 2356 */
2357 2357 if (devmap == nodev || devmap == NULL ||
2358 2358 devmap == nulldev)
2359 2359 return (ENODEV);
2360 2360
2361 2361 error = devmap_setup(dev, off, as, addrp,
2362 2362 len, prot, maxprot, flags, cred);
2363 2363
2364 2364 return (error);
2365 2365 } else
2366 2366 segmap = spec_segmap;
2367 2367 } else
2368 2368 segmap = cdev_segmap;
2369 2369
2370 2370 return ((*segmap)(dev, (off_t)off, as, addrp, len, prot,
2371 2371 maxprot, flags, cred));
2372 2372 }
2373 2373
2374 2374 /*ARGSUSED9*/
2375 2375 static int
2376 2376 spec_map(
2377 2377 struct vnode *vp,
2378 2378 offset_t off,
2379 2379 struct as *as,
2380 2380 caddr_t *addrp,
2381 2381 size_t len,
2382 2382 uchar_t prot,
2383 2383 uchar_t maxprot,
2384 2384 uint_t flags,
2385 2385 struct cred *cred,
2386 2386 caller_context_t *ct)
2387 2387 {
2388 2388 int error = 0;
2389 2389 struct snode *sp = VTOS(vp);
2390 2390
2391 2391 if (vp->v_flag & VNOMAP)
2392 2392 return (ENOSYS);
2393 2393
2394 2394 /* fail map with ENXIO if the device is fenced off */
2395 2395 if (S_ISFENCED(sp))
2396 2396 return (ENXIO);
2397 2397
2398 2398 /*
2399 2399 * If file is locked, fail mapping attempt.
2400 2400 */
2401 2401 if (vn_has_flocks(vp))
2402 2402 return (EAGAIN);
2403 2403
2404 2404 if (vp->v_type == VCHR) {
2405 2405 return (spec_char_map(vp->v_rdev, off, as, addrp, len, prot,
2406 2406 maxprot, flags, cred));
2407 2407 } else if (vp->v_type == VBLK) {
2408 2408 struct segvn_crargs vn_a;
2409 2409 struct vnode *cvp;
2410 2410 struct snode *sp;
2411 2411
2412 2412 /*
2413 2413 * Block device, use segvn mapping to the underlying commonvp
2414 2414 * for pages.
2415 2415 */
2416 2416 if (off > spec_maxoffset(vp))
2417 2417 return (ENXIO);
2418 2418
2419 2419 sp = VTOS(vp);
2420 2420 cvp = sp->s_commonvp;
2421 2421 ASSERT(cvp != NULL);
2422 2422
2423 2423 if (off < 0 || ((offset_t)(off + len) < 0))
2424 2424 return (ENXIO);
2425 2425
2426 2426 as_rangelock(as);
2427 2427 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
2428 2428 if (error != 0) {
2429 2429 as_rangeunlock(as);
2430 2430 return (error);
2431 2431 }
2432 2432
2433 2433 vn_a.vp = cvp;
2434 2434 vn_a.offset = off;
2435 2435 vn_a.type = flags & MAP_TYPE;
2436 2436 vn_a.prot = (uchar_t)prot;
2437 2437 vn_a.maxprot = (uchar_t)maxprot;
2438 2438 vn_a.flags = flags & ~MAP_TYPE;
2439 2439 vn_a.cred = cred;
2440 2440 vn_a.amp = NULL;
2441 2441 vn_a.szc = 0;
2442 2442 vn_a.lgrp_mem_policy_flags = 0;
2443 2443
2444 2444 error = as_map(as, *addrp, len, segvn_create, &vn_a);
2445 2445 as_rangeunlock(as);
2446 2446 } else
2447 2447 return (ENODEV);
2448 2448
2449 2449 return (error);
2450 2450 }
2451 2451
2452 2452 /*ARGSUSED1*/
2453 2453 static int
2454 2454 spec_addmap(
2455 2455 struct vnode *vp, /* the common vnode */
2456 2456 offset_t off,
2457 2457 struct as *as,
2458 2458 caddr_t addr,
2459 2459 size_t len, /* how many bytes to add */
2460 2460 uchar_t prot,
2461 2461 uchar_t maxprot,
2462 2462 uint_t flags,
2463 2463 struct cred *cred,
2464 2464 caller_context_t *ct)
2465 2465 {
2466 2466 int error = 0;
2467 2467 struct snode *csp = VTOS(vp);
2468 2468 ulong_t npages;
2469 2469
2470 2470 ASSERT(vp != NULL && VTOS(vp)->s_commonvp == vp);
2471 2471
2472 2472 /*
2473 2473 * XXX Given the above assertion, this might not
2474 2474 * be a particularly sensible thing to test.
2475 2475 */
2476 2476 if (vp->v_flag & VNOMAP)
2477 2477 return (ENOSYS);
2478 2478
2479 2479 /* fail with EIO if the device is fenced off */
2480 2480 if (S_ISFENCED(csp))
2481 2481 return (EIO);
2482 2482
2483 2483 npages = btopr(len);
2484 2484 LOCK_CSP(csp);
2485 2485 csp->s_mapcnt += npages;
2486 2486
2487 2487 UNLOCK_CSP(csp);
2488 2488 return (error);
2489 2489 }
2490 2490
2491 2491 /*ARGSUSED1*/
2492 2492 static int
2493 2493 spec_delmap(
2494 2494 struct vnode *vp, /* the common vnode */
2495 2495 offset_t off,
2496 2496 struct as *as,
2497 2497 caddr_t addr,
2498 2498 size_t len, /* how many bytes to take away */
2499 2499 uint_t prot,
2500 2500 uint_t maxprot,
2501 2501 uint_t flags,
2502 2502 struct cred *cred,
2503 2503 caller_context_t *ct)
2504 2504 {
2505 2505 struct snode *csp = VTOS(vp);
2506 2506 ulong_t npages;
2507 2507 long mcnt;
2508 2508
2509 2509 /* segdev passes us the common vp */
2510 2510
2511 2511 ASSERT(vp != NULL && VTOS(vp)->s_commonvp == vp);
2512 2512
2513 2513 /* allow delmap to succeed even if device fenced off */
2514 2514
2515 2515 /*
2516 2516 * XXX Given the above assertion, this might not
2517 2517 * be a particularly sensible thing to test..
2518 2518 */
2519 2519 if (vp->v_flag & VNOMAP)
2520 2520 return (ENOSYS);
2521 2521
2522 2522 npages = btopr(len);
2523 2523
2524 2524 LOCK_CSP(csp);
2525 2525 mutex_enter(&csp->s_lock);
2526 2526 mcnt = (csp->s_mapcnt -= npages);
2527 2527
2528 2528 if (mcnt == 0) {
2529 2529 /*
2530 2530 * Call the close routine when the last reference of any
2531 2531 * kind through any [s, v]node goes away. The s_dip hold
2532 2532 * on the devinfo node is released when the vnode is
2533 2533 * destroyed.
2534 2534 */
2535 2535 if (csp->s_count == 0) {
2536 2536 csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID);
2537 2537
2538 2538 /* See comment in spec_close() */
2539 2539 if (csp->s_flag & (SCLONE | SSELFCLONE))
2540 2540 csp->s_flag &= ~SDIPSET;
2541 2541
2542 2542 mutex_exit(&csp->s_lock);
2543 2543
2544 2544 (void) device_close(vp, 0, cred);
2545 2545 } else
2546 2546 mutex_exit(&csp->s_lock);
2547 2547
2548 2548 mutex_enter(&csp->s_lock);
2549 2549 }
2550 2550 ASSERT(mcnt >= 0);
2551 2551
2552 2552 UNLOCK_CSP_LOCK_HELD(csp);
2553 2553 mutex_exit(&csp->s_lock);
2554 2554
2555 2555 return (0);
2556 2556 }
2557 2557
2558 2558 /*ARGSUSED4*/
2559 2559 static int
2560 2560 spec_dump(
2561 2561 struct vnode *vp,
2562 2562 caddr_t addr,
2563 2563 offset_t bn,
2564 2564 offset_t count,
2565 2565 caller_context_t *ct)
2566 2566 {
2567 2567 /* allow dump to succeed even if device fenced off */
2568 2568
2569 2569 ASSERT(vp->v_type == VBLK);
2570 2570 return (bdev_dump(vp->v_rdev, addr, (daddr_t)bn, (int)count));
2571 2571 }
2572 2572
2573 2573
2574 2574 /*
2575 2575 * Do i/o on the given page list from/to vp, io_off for io_len.
2576 2576 * Flags are composed of:
2577 2577 * {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED, B_READ, B_WRITE}
2578 2578 * If B_ASYNC is not set i/o is waited for.
2579 2579 */
2580 2580 /*ARGSUSED5*/
2581 2581 static int
2582 2582 spec_pageio(
2583 2583 struct vnode *vp,
2584 2584 page_t *pp,
2585 2585 u_offset_t io_off,
2586 2586 size_t io_len,
2587 2587 int flags,
2588 2588 cred_t *cr,
2589 2589 caller_context_t *ct)
2590 2590 {
2591 2591 struct buf *bp = NULL;
2592 2592 int err = 0;
2593 2593
2594 2594 if (pp == NULL)
2595 2595 return (EINVAL);
2596 2596
2597 2597 bp = spec_startio(vp, pp, io_off, io_len, flags);
2598 2598
2599 2599 /*
2600 2600 * Wait for i/o to complete if the request is not B_ASYNC.
2601 2601 */
2602 2602 if ((flags & B_ASYNC) == 0) {
2603 2603 err = biowait(bp);
2604 2604 pageio_done(bp);
2605 2605 }
2606 2606 return (err);
2607 2607 }
2608 2608
2609 2609 /*
2610 2610 * Set ACL on underlying vnode if one exists, or return ENOSYS otherwise.
2611 2611 */
2612 2612 int
2613 2613 spec_setsecattr(
2614 2614 struct vnode *vp,
2615 2615 vsecattr_t *vsap,
2616 2616 int flag,
2617 2617 struct cred *cr,
2618 2618 caller_context_t *ct)
2619 2619 {
2620 2620 struct vnode *realvp;
2621 2621 struct snode *sp = VTOS(vp);
2622 2622 int error;
2623 2623
2624 2624 /* fail with ENXIO if the device is fenced off */
2625 2625 if (S_ISFENCED(sp))
2626 2626 return (ENXIO);
2627 2627
2628 2628 /*
2629 2629 * The acl(2) system calls VOP_RWLOCK on the file before setting an
2630 2630 * ACL, but since specfs does not serialize reads and writes, this
2631 2631 * VOP does not do anything. However, some backing file systems may
2632 2632 * expect the lock to be held before setting an ACL, so it is taken
2633 2633 * here privately to avoid serializing specfs reads and writes.
2634 2634 */
2635 2635 if ((realvp = sp->s_realvp) != NULL) {
2636 2636 (void) VOP_RWLOCK(realvp, V_WRITELOCK_TRUE, ct);
2637 2637 error = VOP_SETSECATTR(realvp, vsap, flag, cr, ct);
2638 2638 (void) VOP_RWUNLOCK(realvp, V_WRITELOCK_TRUE, ct);
2639 2639 return (error);
2640 2640 } else
2641 2641 return (fs_nosys());
2642 2642 }
2643 2643
2644 2644 /*
2645 2645 * Get ACL from underlying vnode if one exists, or fabricate it from
2646 2646 * the permissions returned by spec_getattr() otherwise.
2647 2647 */
2648 2648 int
2649 2649 spec_getsecattr(
2650 2650 struct vnode *vp,
2651 2651 vsecattr_t *vsap,
2652 2652 int flag,
2653 2653 struct cred *cr,
2654 2654 caller_context_t *ct)
2655 2655 {
2656 2656 struct vnode *realvp;
2657 2657 struct snode *sp = VTOS(vp);
2658 2658
2659 2659 /* fail with ENXIO if the device is fenced off */
2660 2660 if (S_ISFENCED(sp))
2661 2661 return (ENXIO);
2662 2662
2663 2663 if ((realvp = sp->s_realvp) != NULL)
2664 2664 return (VOP_GETSECATTR(realvp, vsap, flag, cr, ct));
2665 2665 else
2666 2666 return (fs_fab_acl(vp, vsap, flag, cr, ct));
2667 2667 }
2668 2668
2669 2669 int
2670 2670 spec_pathconf(
2671 2671 vnode_t *vp,
2672 2672 int cmd,
2673 2673 ulong_t *valp,
2674 2674 cred_t *cr,
2675 2675 caller_context_t *ct)
2676 2676 {
2677 2677 vnode_t *realvp;
2678 2678 struct snode *sp = VTOS(vp);
2679 2679
2680 2680 /* fail with ENXIO if the device is fenced off */
2681 2681 if (S_ISFENCED(sp))
2682 2682 return (ENXIO);
2683 2683
2684 2684 if ((realvp = sp->s_realvp) != NULL)
2685 2685 return (VOP_PATHCONF(realvp, cmd, valp, cr, ct));
2686 2686 else
2687 2687 return (fs_pathconf(vp, cmd, valp, cr, ct));
2688 2688 }
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