1 | /* $NetBSD: dk.c,v 1.91 2016/05/29 13:11:21 mlelstv Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2004, 2005, 2006, 2007 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Jason R. Thorpe. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: dk.c,v 1.91 2016/05/29 13:11:21 mlelstv Exp $" ); |
34 | |
35 | #ifdef _KERNEL_OPT |
36 | #include "opt_dkwedge.h" |
37 | #endif |
38 | |
39 | #include <sys/param.h> |
40 | #include <sys/systm.h> |
41 | #include <sys/proc.h> |
42 | #include <sys/errno.h> |
43 | #include <sys/pool.h> |
44 | #include <sys/ioctl.h> |
45 | #include <sys/disklabel.h> |
46 | #include <sys/disk.h> |
47 | #include <sys/fcntl.h> |
48 | #include <sys/buf.h> |
49 | #include <sys/bufq.h> |
50 | #include <sys/vnode.h> |
51 | #include <sys/stat.h> |
52 | #include <sys/conf.h> |
53 | #include <sys/callout.h> |
54 | #include <sys/kernel.h> |
55 | #include <sys/malloc.h> |
56 | #include <sys/device.h> |
57 | #include <sys/kauth.h> |
58 | |
59 | #include <miscfs/specfs/specdev.h> |
60 | |
61 | MALLOC_DEFINE(M_DKWEDGE, "dkwedge" , "Disk wedge structures" ); |
62 | |
63 | typedef enum { |
64 | DKW_STATE_LARVAL = 0, |
65 | DKW_STATE_RUNNING = 1, |
66 | DKW_STATE_DYING = 2, |
67 | DKW_STATE_DEAD = 666 |
68 | } dkwedge_state_t; |
69 | |
70 | struct dkwedge_softc { |
71 | device_t sc_dev; /* pointer to our pseudo-device */ |
72 | struct cfdata sc_cfdata; /* our cfdata structure */ |
73 | uint8_t sc_wname[128]; /* wedge name (Unicode, UTF-8) */ |
74 | |
75 | dkwedge_state_t sc_state; /* state this wedge is in */ |
76 | |
77 | struct disk *sc_parent; /* parent disk */ |
78 | daddr_t sc_offset; /* LBA offset of wedge in parent */ |
79 | uint64_t sc_size; /* size of wedge in blocks */ |
80 | char sc_ptype[32]; /* partition type */ |
81 | dev_t sc_pdev; /* cached parent's dev_t */ |
82 | /* link on parent's wedge list */ |
83 | LIST_ENTRY(dkwedge_softc) sc_plink; |
84 | |
85 | struct disk sc_dk; /* our own disk structure */ |
86 | struct bufq_state *sc_bufq; /* buffer queue */ |
87 | struct callout sc_restart_ch; /* callout to restart I/O */ |
88 | |
89 | u_int sc_iopend; /* I/Os pending */ |
90 | int sc_flags; /* flags (splbio) */ |
91 | }; |
92 | |
93 | #define DK_F_WAIT_DRAIN 0x0001 /* waiting for I/O to drain */ |
94 | |
95 | static void dkstart(struct dkwedge_softc *); |
96 | static void dkiodone(struct buf *); |
97 | static void dkrestart(void *); |
98 | static void dkminphys(struct buf *); |
99 | |
100 | static int dklastclose(struct dkwedge_softc *); |
101 | static int dkwedge_cleanup_parent(struct dkwedge_softc *, int); |
102 | static int dkwedge_detach(device_t, int); |
103 | static void dkwedge_delall1(struct disk *, bool); |
104 | static int dkwedge_del1(struct dkwedge_info *, int); |
105 | static int dk_open_parent(dev_t, int, struct vnode **); |
106 | static int dk_close_parent(struct vnode *, int); |
107 | |
108 | static dev_type_open(dkopen); |
109 | static dev_type_close(dkclose); |
110 | static dev_type_read(dkread); |
111 | static dev_type_write(dkwrite); |
112 | static dev_type_ioctl(dkioctl); |
113 | static dev_type_strategy(dkstrategy); |
114 | static dev_type_dump(dkdump); |
115 | static dev_type_size(dksize); |
116 | static dev_type_discard(dkdiscard); |
117 | |
118 | const struct bdevsw dk_bdevsw = { |
119 | .d_open = dkopen, |
120 | .d_close = dkclose, |
121 | .d_strategy = dkstrategy, |
122 | .d_ioctl = dkioctl, |
123 | .d_dump = dkdump, |
124 | .d_psize = dksize, |
125 | .d_discard = dkdiscard, |
126 | .d_flag = D_DISK |
127 | }; |
128 | |
129 | const struct cdevsw dk_cdevsw = { |
130 | .d_open = dkopen, |
131 | .d_close = dkclose, |
132 | .d_read = dkread, |
133 | .d_write = dkwrite, |
134 | .d_ioctl = dkioctl, |
135 | .d_stop = nostop, |
136 | .d_tty = notty, |
137 | .d_poll = nopoll, |
138 | .d_mmap = nommap, |
139 | .d_kqfilter = nokqfilter, |
140 | .d_discard = dkdiscard, |
141 | .d_flag = D_DISK |
142 | }; |
143 | |
144 | static struct dkwedge_softc **dkwedges; |
145 | static u_int ndkwedges; |
146 | static krwlock_t dkwedges_lock; |
147 | |
148 | static LIST_HEAD(, dkwedge_discovery_method) dkwedge_discovery_methods; |
149 | static krwlock_t dkwedge_discovery_methods_lock; |
150 | |
151 | /* |
152 | * dkwedge_match: |
153 | * |
154 | * Autoconfiguration match function for pseudo-device glue. |
155 | */ |
156 | static int |
157 | dkwedge_match(device_t parent, cfdata_t match, |
158 | void *aux) |
159 | { |
160 | |
161 | /* Pseudo-device; always present. */ |
162 | return (1); |
163 | } |
164 | |
165 | /* |
166 | * dkwedge_attach: |
167 | * |
168 | * Autoconfiguration attach function for pseudo-device glue. |
169 | */ |
170 | static void |
171 | dkwedge_attach(device_t parent, device_t self, |
172 | void *aux) |
173 | { |
174 | |
175 | if (!pmf_device_register(self, NULL, NULL)) |
176 | aprint_error_dev(self, "couldn't establish power handler\n" ); |
177 | } |
178 | |
179 | CFDRIVER_DECL(dk, DV_DISK, NULL); |
180 | CFATTACH_DECL3_NEW(dk, 0, |
181 | dkwedge_match, dkwedge_attach, dkwedge_detach, NULL, NULL, NULL, |
182 | DVF_DETACH_SHUTDOWN); |
183 | |
184 | /* |
185 | * dkwedge_wait_drain: |
186 | * |
187 | * Wait for I/O on the wedge to drain. |
188 | * NOTE: Must be called at splbio()! |
189 | */ |
190 | static void |
191 | dkwedge_wait_drain(struct dkwedge_softc *sc) |
192 | { |
193 | |
194 | while (sc->sc_iopend != 0) { |
195 | sc->sc_flags |= DK_F_WAIT_DRAIN; |
196 | (void) tsleep(&sc->sc_iopend, PRIBIO, "dkdrn" , 0); |
197 | } |
198 | } |
199 | |
200 | /* |
201 | * dkwedge_compute_pdev: |
202 | * |
203 | * Compute the parent disk's dev_t. |
204 | */ |
205 | static int |
206 | dkwedge_compute_pdev(const char *pname, dev_t *pdevp, enum vtype type) |
207 | { |
208 | const char *name, *cp; |
209 | devmajor_t pmaj; |
210 | int punit; |
211 | char devname[16]; |
212 | |
213 | name = pname; |
214 | switch (type) { |
215 | case VBLK: |
216 | pmaj = devsw_name2blk(name, devname, sizeof(devname)); |
217 | break; |
218 | case VCHR: |
219 | pmaj = devsw_name2chr(name, devname, sizeof(devname)); |
220 | break; |
221 | default: |
222 | pmaj = NODEVMAJOR; |
223 | break; |
224 | } |
225 | if (pmaj == NODEVMAJOR) |
226 | return (ENODEV); |
227 | |
228 | name += strlen(devname); |
229 | for (cp = name, punit = 0; *cp >= '0' && *cp <= '9'; cp++) |
230 | punit = (punit * 10) + (*cp - '0'); |
231 | if (cp == name) { |
232 | /* Invalid parent disk name. */ |
233 | return (ENODEV); |
234 | } |
235 | |
236 | *pdevp = MAKEDISKDEV(pmaj, punit, RAW_PART); |
237 | |
238 | return (0); |
239 | } |
240 | |
241 | /* |
242 | * dkwedge_array_expand: |
243 | * |
244 | * Expand the dkwedges array. |
245 | */ |
246 | static void |
247 | dkwedge_array_expand(void) |
248 | { |
249 | int newcnt = ndkwedges + 16; |
250 | struct dkwedge_softc **newarray, **oldarray; |
251 | |
252 | newarray = malloc(newcnt * sizeof(*newarray), M_DKWEDGE, |
253 | M_WAITOK|M_ZERO); |
254 | if ((oldarray = dkwedges) != NULL) |
255 | memcpy(newarray, dkwedges, ndkwedges * sizeof(*newarray)); |
256 | dkwedges = newarray; |
257 | ndkwedges = newcnt; |
258 | if (oldarray != NULL) |
259 | free(oldarray, M_DKWEDGE); |
260 | } |
261 | |
262 | static void |
263 | dk_set_geometry(struct dkwedge_softc *sc, struct disk *pdk) |
264 | { |
265 | struct disk *dk = &sc->sc_dk; |
266 | struct disk_geom *dg = &dk->dk_geom; |
267 | |
268 | memset(dg, 0, sizeof(*dg)); |
269 | |
270 | dg->dg_secperunit = sc->sc_size; |
271 | dg->dg_secsize = DEV_BSIZE << pdk->dk_blkshift; |
272 | |
273 | /* fake numbers, 1 cylinder is 1 MB with default sector size */ |
274 | dg->dg_nsectors = 32; |
275 | dg->dg_ntracks = 64; |
276 | dg->dg_ncylinders = dg->dg_secperunit / (dg->dg_nsectors * dg->dg_ntracks); |
277 | |
278 | disk_set_info(sc->sc_dev, dk, NULL); |
279 | } |
280 | |
281 | /* |
282 | * dkwedge_add: [exported function] |
283 | * |
284 | * Add a disk wedge based on the provided information. |
285 | * |
286 | * The incoming dkw_devname[] is ignored, instead being |
287 | * filled in and returned to the caller. |
288 | */ |
289 | int |
290 | dkwedge_add(struct dkwedge_info *dkw) |
291 | { |
292 | struct dkwedge_softc *sc, *lsc; |
293 | struct disk *pdk; |
294 | u_int unit; |
295 | int error; |
296 | dev_t pdev; |
297 | |
298 | dkw->dkw_parent[sizeof(dkw->dkw_parent) - 1] = '\0'; |
299 | pdk = disk_find(dkw->dkw_parent); |
300 | if (pdk == NULL) |
301 | return (ENODEV); |
302 | |
303 | error = dkwedge_compute_pdev(pdk->dk_name, &pdev, VBLK); |
304 | if (error) |
305 | return (error); |
306 | |
307 | if (dkw->dkw_offset < 0) |
308 | return (EINVAL); |
309 | |
310 | sc = malloc(sizeof(*sc), M_DKWEDGE, M_WAITOK|M_ZERO); |
311 | sc->sc_state = DKW_STATE_LARVAL; |
312 | sc->sc_parent = pdk; |
313 | sc->sc_pdev = pdev; |
314 | sc->sc_offset = dkw->dkw_offset; |
315 | sc->sc_size = dkw->dkw_size; |
316 | |
317 | memcpy(sc->sc_wname, dkw->dkw_wname, sizeof(sc->sc_wname)); |
318 | sc->sc_wname[sizeof(sc->sc_wname) - 1] = '\0'; |
319 | |
320 | memcpy(sc->sc_ptype, dkw->dkw_ptype, sizeof(sc->sc_ptype)); |
321 | sc->sc_ptype[sizeof(sc->sc_ptype) - 1] = '\0'; |
322 | |
323 | bufq_alloc(&sc->sc_bufq, "fcfs" , 0); |
324 | |
325 | callout_init(&sc->sc_restart_ch, 0); |
326 | callout_setfunc(&sc->sc_restart_ch, dkrestart, sc); |
327 | |
328 | /* |
329 | * Wedge will be added; increment the wedge count for the parent. |
330 | * Only allow this to happend if RAW_PART is the only thing open. |
331 | */ |
332 | mutex_enter(&pdk->dk_openlock); |
333 | if (pdk->dk_openmask & ~(1 << RAW_PART)) |
334 | error = EBUSY; |
335 | else { |
336 | /* Check for wedge overlap. */ |
337 | LIST_FOREACH(lsc, &pdk->dk_wedges, sc_plink) { |
338 | daddr_t lastblk = sc->sc_offset + sc->sc_size - 1; |
339 | daddr_t llastblk = lsc->sc_offset + lsc->sc_size - 1; |
340 | |
341 | if (sc->sc_offset >= lsc->sc_offset && |
342 | sc->sc_offset <= llastblk) { |
343 | /* Overlaps the tail of the existing wedge. */ |
344 | break; |
345 | } |
346 | if (lastblk >= lsc->sc_offset && |
347 | lastblk <= llastblk) { |
348 | /* Overlaps the head of the existing wedge. */ |
349 | break; |
350 | } |
351 | } |
352 | if (lsc != NULL) { |
353 | if (sc->sc_offset == lsc->sc_offset && |
354 | sc->sc_size == lsc->sc_size && |
355 | strcmp(sc->sc_wname, lsc->sc_wname) == 0) |
356 | error = EEXIST; |
357 | else |
358 | error = EINVAL; |
359 | } else { |
360 | pdk->dk_nwedges++; |
361 | LIST_INSERT_HEAD(&pdk->dk_wedges, sc, sc_plink); |
362 | } |
363 | } |
364 | mutex_exit(&pdk->dk_openlock); |
365 | if (error) { |
366 | bufq_free(sc->sc_bufq); |
367 | free(sc, M_DKWEDGE); |
368 | return (error); |
369 | } |
370 | |
371 | /* Fill in our cfdata for the pseudo-device glue. */ |
372 | sc->sc_cfdata.cf_name = dk_cd.cd_name; |
373 | sc->sc_cfdata.cf_atname = dk_ca.ca_name; |
374 | /* sc->sc_cfdata.cf_unit set below */ |
375 | sc->sc_cfdata.cf_fstate = FSTATE_STAR; |
376 | |
377 | /* Insert the larval wedge into the array. */ |
378 | rw_enter(&dkwedges_lock, RW_WRITER); |
379 | for (error = 0;;) { |
380 | struct dkwedge_softc **scpp; |
381 | |
382 | /* |
383 | * Check for a duplicate wname while searching for |
384 | * a slot. |
385 | */ |
386 | for (scpp = NULL, unit = 0; unit < ndkwedges; unit++) { |
387 | if (dkwedges[unit] == NULL) { |
388 | if (scpp == NULL) { |
389 | scpp = &dkwedges[unit]; |
390 | sc->sc_cfdata.cf_unit = unit; |
391 | } |
392 | } else { |
393 | /* XXX Unicode. */ |
394 | if (strcmp(dkwedges[unit]->sc_wname, |
395 | sc->sc_wname) == 0) { |
396 | error = EEXIST; |
397 | break; |
398 | } |
399 | } |
400 | } |
401 | if (error) |
402 | break; |
403 | KASSERT(unit == ndkwedges); |
404 | if (scpp == NULL) |
405 | dkwedge_array_expand(); |
406 | else { |
407 | KASSERT(scpp == &dkwedges[sc->sc_cfdata.cf_unit]); |
408 | *scpp = sc; |
409 | break; |
410 | } |
411 | } |
412 | rw_exit(&dkwedges_lock); |
413 | if (error) { |
414 | mutex_enter(&pdk->dk_openlock); |
415 | pdk->dk_nwedges--; |
416 | LIST_REMOVE(sc, sc_plink); |
417 | mutex_exit(&pdk->dk_openlock); |
418 | |
419 | bufq_free(sc->sc_bufq); |
420 | free(sc, M_DKWEDGE); |
421 | return (error); |
422 | } |
423 | |
424 | /* |
425 | * Now that we know the unit #, attach a pseudo-device for |
426 | * this wedge instance. This will provide us with the |
427 | * device_t necessary for glue to other parts of the system. |
428 | * |
429 | * This should never fail, unless we're almost totally out of |
430 | * memory. |
431 | */ |
432 | if ((sc->sc_dev = config_attach_pseudo(&sc->sc_cfdata)) == NULL) { |
433 | aprint_error("%s%u: unable to attach pseudo-device\n" , |
434 | sc->sc_cfdata.cf_name, sc->sc_cfdata.cf_unit); |
435 | |
436 | rw_enter(&dkwedges_lock, RW_WRITER); |
437 | dkwedges[sc->sc_cfdata.cf_unit] = NULL; |
438 | rw_exit(&dkwedges_lock); |
439 | |
440 | mutex_enter(&pdk->dk_openlock); |
441 | pdk->dk_nwedges--; |
442 | LIST_REMOVE(sc, sc_plink); |
443 | mutex_exit(&pdk->dk_openlock); |
444 | |
445 | bufq_free(sc->sc_bufq); |
446 | free(sc, M_DKWEDGE); |
447 | return (ENOMEM); |
448 | } |
449 | |
450 | /* Return the devname to the caller. */ |
451 | strlcpy(dkw->dkw_devname, device_xname(sc->sc_dev), |
452 | sizeof(dkw->dkw_devname)); |
453 | |
454 | /* |
455 | * XXX Really ought to make the disk_attach() and the changing |
456 | * of state to RUNNING atomic. |
457 | */ |
458 | |
459 | disk_init(&sc->sc_dk, device_xname(sc->sc_dev), NULL); |
460 | dk_set_geometry(sc, pdk); |
461 | disk_attach(&sc->sc_dk); |
462 | |
463 | /* Disk wedge is ready for use! */ |
464 | sc->sc_state = DKW_STATE_RUNNING; |
465 | |
466 | /* Announce our arrival. */ |
467 | aprint_normal( |
468 | "%s at %s: \"%s\", %" PRIu64" blocks at %" PRId64", type: %s\n" , |
469 | device_xname(sc->sc_dev), pdk->dk_name, |
470 | sc->sc_wname, /* XXX Unicode */ |
471 | sc->sc_size, sc->sc_offset, |
472 | sc->sc_ptype[0] == '\0' ? "<unknown>" : sc->sc_ptype); |
473 | |
474 | return (0); |
475 | } |
476 | |
477 | /* |
478 | * dkwedge_find: |
479 | * |
480 | * Lookup a disk wedge based on the provided information. |
481 | * NOTE: We look up the wedge based on the wedge devname, |
482 | * not wname. |
483 | * |
484 | * Return NULL if the wedge is not found, otherwise return |
485 | * the wedge's softc. Assign the wedge's unit number to unitp |
486 | * if unitp is not NULL. |
487 | */ |
488 | static struct dkwedge_softc * |
489 | dkwedge_find(struct dkwedge_info *dkw, u_int *unitp) |
490 | { |
491 | struct dkwedge_softc *sc = NULL; |
492 | u_int unit; |
493 | |
494 | /* Find our softc. */ |
495 | dkw->dkw_devname[sizeof(dkw->dkw_devname) - 1] = '\0'; |
496 | rw_enter(&dkwedges_lock, RW_READER); |
497 | for (unit = 0; unit < ndkwedges; unit++) { |
498 | if ((sc = dkwedges[unit]) != NULL && |
499 | strcmp(device_xname(sc->sc_dev), dkw->dkw_devname) == 0 && |
500 | strcmp(sc->sc_parent->dk_name, dkw->dkw_parent) == 0) { |
501 | break; |
502 | } |
503 | } |
504 | rw_exit(&dkwedges_lock); |
505 | if (unit == ndkwedges) |
506 | return NULL; |
507 | |
508 | if (unitp != NULL) |
509 | *unitp = unit; |
510 | |
511 | return sc; |
512 | } |
513 | |
514 | /* |
515 | * dkwedge_del: [exported function] |
516 | * |
517 | * Delete a disk wedge based on the provided information. |
518 | * NOTE: We look up the wedge based on the wedge devname, |
519 | * not wname. |
520 | */ |
521 | int |
522 | dkwedge_del(struct dkwedge_info *dkw) |
523 | { |
524 | return dkwedge_del1(dkw, 0); |
525 | } |
526 | |
527 | int |
528 | dkwedge_del1(struct dkwedge_info *dkw, int flags) |
529 | { |
530 | struct dkwedge_softc *sc = NULL; |
531 | |
532 | /* Find our softc. */ |
533 | if ((sc = dkwedge_find(dkw, NULL)) == NULL) |
534 | return (ESRCH); |
535 | |
536 | return config_detach(sc->sc_dev, flags); |
537 | } |
538 | |
539 | static int |
540 | dkwedge_cleanup_parent(struct dkwedge_softc *sc, int flags) |
541 | { |
542 | struct disk *dk = &sc->sc_dk; |
543 | int rc; |
544 | |
545 | rc = 0; |
546 | mutex_enter(&dk->dk_openlock); |
547 | if (dk->dk_openmask == 0) |
548 | /* nothing to do */ |
549 | mutex_exit(&dk->dk_openlock); |
550 | else if ((flags & DETACH_FORCE) == 0) { |
551 | rc = EBUSY; |
552 | mutex_exit(&dk->dk_openlock); |
553 | } else { |
554 | mutex_enter(&sc->sc_parent->dk_rawlock); |
555 | rc = dklastclose(sc); /* releases locks */ |
556 | } |
557 | |
558 | return rc; |
559 | } |
560 | |
561 | /* |
562 | * dkwedge_detach: |
563 | * |
564 | * Autoconfiguration detach function for pseudo-device glue. |
565 | */ |
566 | static int |
567 | dkwedge_detach(device_t self, int flags) |
568 | { |
569 | struct dkwedge_softc *sc = NULL; |
570 | u_int unit; |
571 | int bmaj, cmaj, rc, s; |
572 | |
573 | rw_enter(&dkwedges_lock, RW_WRITER); |
574 | for (unit = 0; unit < ndkwedges; unit++) { |
575 | if ((sc = dkwedges[unit]) != NULL && sc->sc_dev == self) |
576 | break; |
577 | } |
578 | if (unit == ndkwedges) |
579 | rc = ENXIO; |
580 | else if ((rc = dkwedge_cleanup_parent(sc, flags)) == 0) { |
581 | /* Mark the wedge as dying. */ |
582 | sc->sc_state = DKW_STATE_DYING; |
583 | } |
584 | rw_exit(&dkwedges_lock); |
585 | |
586 | if (rc != 0) |
587 | return rc; |
588 | |
589 | pmf_device_deregister(self); |
590 | |
591 | /* Locate the wedge major numbers. */ |
592 | bmaj = bdevsw_lookup_major(&dk_bdevsw); |
593 | cmaj = cdevsw_lookup_major(&dk_cdevsw); |
594 | |
595 | /* Kill any pending restart. */ |
596 | callout_stop(&sc->sc_restart_ch); |
597 | |
598 | /* |
599 | * dkstart() will kill any queued buffers now that the |
600 | * state of the wedge is not RUNNING. Once we've done |
601 | * that, wait for any other pending I/O to complete. |
602 | */ |
603 | s = splbio(); |
604 | dkstart(sc); |
605 | dkwedge_wait_drain(sc); |
606 | splx(s); |
607 | |
608 | /* Nuke the vnodes for any open instances. */ |
609 | vdevgone(bmaj, unit, unit, VBLK); |
610 | vdevgone(cmaj, unit, unit, VCHR); |
611 | |
612 | /* Clean up the parent. */ |
613 | dkwedge_cleanup_parent(sc, flags | DETACH_FORCE); |
614 | |
615 | /* Announce our departure. */ |
616 | aprint_normal("%s at %s (%s) deleted\n" , device_xname(sc->sc_dev), |
617 | sc->sc_parent->dk_name, |
618 | sc->sc_wname); /* XXX Unicode */ |
619 | |
620 | mutex_enter(&sc->sc_parent->dk_openlock); |
621 | sc->sc_parent->dk_nwedges--; |
622 | LIST_REMOVE(sc, sc_plink); |
623 | mutex_exit(&sc->sc_parent->dk_openlock); |
624 | |
625 | /* Delete our buffer queue. */ |
626 | bufq_free(sc->sc_bufq); |
627 | |
628 | /* Detach from the disk list. */ |
629 | disk_detach(&sc->sc_dk); |
630 | disk_destroy(&sc->sc_dk); |
631 | |
632 | /* Poof. */ |
633 | rw_enter(&dkwedges_lock, RW_WRITER); |
634 | dkwedges[unit] = NULL; |
635 | sc->sc_state = DKW_STATE_DEAD; |
636 | rw_exit(&dkwedges_lock); |
637 | |
638 | free(sc, M_DKWEDGE); |
639 | |
640 | return 0; |
641 | } |
642 | |
643 | /* |
644 | * dkwedge_delall: [exported function] |
645 | * |
646 | * Delete all of the wedges on the specified disk. Used when |
647 | * a disk is being detached. |
648 | */ |
649 | void |
650 | dkwedge_delall(struct disk *pdk) |
651 | { |
652 | dkwedge_delall1(pdk, false); |
653 | } |
654 | |
655 | static void |
656 | dkwedge_delall1(struct disk *pdk, bool idleonly) |
657 | { |
658 | struct dkwedge_info dkw; |
659 | struct dkwedge_softc *sc; |
660 | int flags; |
661 | |
662 | flags = DETACH_QUIET; |
663 | if (!idleonly) flags |= DETACH_FORCE; |
664 | |
665 | for (;;) { |
666 | mutex_enter(&pdk->dk_openlock); |
667 | LIST_FOREACH(sc, &pdk->dk_wedges, sc_plink) { |
668 | if (!idleonly || sc->sc_dk.dk_openmask == 0) |
669 | break; |
670 | } |
671 | if (sc == NULL) { |
672 | KASSERT(idleonly || pdk->dk_nwedges == 0); |
673 | mutex_exit(&pdk->dk_openlock); |
674 | return; |
675 | } |
676 | strcpy(dkw.dkw_parent, pdk->dk_name); |
677 | strlcpy(dkw.dkw_devname, device_xname(sc->sc_dev), |
678 | sizeof(dkw.dkw_devname)); |
679 | mutex_exit(&pdk->dk_openlock); |
680 | (void) dkwedge_del1(&dkw, flags); |
681 | } |
682 | } |
683 | |
684 | /* |
685 | * dkwedge_list: [exported function] |
686 | * |
687 | * List all of the wedges on a particular disk. |
688 | */ |
689 | int |
690 | dkwedge_list(struct disk *pdk, struct dkwedge_list *dkwl, struct lwp *l) |
691 | { |
692 | struct uio uio; |
693 | struct iovec iov; |
694 | struct dkwedge_softc *sc; |
695 | struct dkwedge_info dkw; |
696 | int error = 0; |
697 | |
698 | iov.iov_base = dkwl->dkwl_buf; |
699 | iov.iov_len = dkwl->dkwl_bufsize; |
700 | |
701 | uio.uio_iov = &iov; |
702 | uio.uio_iovcnt = 1; |
703 | uio.uio_offset = 0; |
704 | uio.uio_resid = dkwl->dkwl_bufsize; |
705 | uio.uio_rw = UIO_READ; |
706 | KASSERT(l == curlwp); |
707 | uio.uio_vmspace = l->l_proc->p_vmspace; |
708 | |
709 | dkwl->dkwl_ncopied = 0; |
710 | |
711 | mutex_enter(&pdk->dk_openlock); |
712 | LIST_FOREACH(sc, &pdk->dk_wedges, sc_plink) { |
713 | if (uio.uio_resid < sizeof(dkw)) |
714 | break; |
715 | |
716 | if (sc->sc_state != DKW_STATE_RUNNING) |
717 | continue; |
718 | |
719 | strlcpy(dkw.dkw_devname, device_xname(sc->sc_dev), |
720 | sizeof(dkw.dkw_devname)); |
721 | memcpy(dkw.dkw_wname, sc->sc_wname, sizeof(dkw.dkw_wname)); |
722 | dkw.dkw_wname[sizeof(dkw.dkw_wname) - 1] = '\0'; |
723 | strcpy(dkw.dkw_parent, sc->sc_parent->dk_name); |
724 | dkw.dkw_offset = sc->sc_offset; |
725 | dkw.dkw_size = sc->sc_size; |
726 | strcpy(dkw.dkw_ptype, sc->sc_ptype); |
727 | |
728 | error = uiomove(&dkw, sizeof(dkw), &uio); |
729 | if (error) |
730 | break; |
731 | dkwl->dkwl_ncopied++; |
732 | } |
733 | dkwl->dkwl_nwedges = pdk->dk_nwedges; |
734 | mutex_exit(&pdk->dk_openlock); |
735 | |
736 | return (error); |
737 | } |
738 | |
739 | device_t |
740 | dkwedge_find_by_wname(const char *wname) |
741 | { |
742 | device_t dv = NULL; |
743 | struct dkwedge_softc *sc; |
744 | int i; |
745 | |
746 | rw_enter(&dkwedges_lock, RW_WRITER); |
747 | for (i = 0; i < ndkwedges; i++) { |
748 | if ((sc = dkwedges[i]) == NULL) |
749 | continue; |
750 | if (strcmp(sc->sc_wname, wname) == 0) { |
751 | if (dv != NULL) { |
752 | printf( |
753 | "WARNING: double match for wedge name %s " |
754 | "(%s, %s)\n" , wname, device_xname(dv), |
755 | device_xname(sc->sc_dev)); |
756 | continue; |
757 | } |
758 | dv = sc->sc_dev; |
759 | } |
760 | } |
761 | rw_exit(&dkwedges_lock); |
762 | return dv; |
763 | } |
764 | |
765 | device_t |
766 | dkwedge_find_by_parent(const char *name, size_t *i) |
767 | { |
768 | rw_enter(&dkwedges_lock, RW_WRITER); |
769 | for (; *i < (size_t)ndkwedges; (*i)++) { |
770 | struct dkwedge_softc *sc; |
771 | if ((sc = dkwedges[*i]) == NULL) |
772 | continue; |
773 | if (strcmp(sc->sc_parent->dk_name, name) != 0) |
774 | continue; |
775 | rw_exit(&dkwedges_lock); |
776 | return sc->sc_dev; |
777 | } |
778 | rw_exit(&dkwedges_lock); |
779 | return NULL; |
780 | } |
781 | |
782 | void |
783 | dkwedge_print_wnames(void) |
784 | { |
785 | struct dkwedge_softc *sc; |
786 | int i; |
787 | |
788 | rw_enter(&dkwedges_lock, RW_WRITER); |
789 | for (i = 0; i < ndkwedges; i++) { |
790 | if ((sc = dkwedges[i]) == NULL) |
791 | continue; |
792 | printf(" wedge:%s" , sc->sc_wname); |
793 | } |
794 | rw_exit(&dkwedges_lock); |
795 | } |
796 | |
797 | /* |
798 | * We need a dummy object to stuff into the dkwedge discovery method link |
799 | * set to ensure that there is always at least one object in the set. |
800 | */ |
801 | static struct dkwedge_discovery_method dummy_discovery_method; |
802 | __link_set_add_bss(dkwedge_methods, dummy_discovery_method); |
803 | |
804 | /* |
805 | * dkwedge_init: |
806 | * |
807 | * Initialize the disk wedge subsystem. |
808 | */ |
809 | void |
810 | dkwedge_init(void) |
811 | { |
812 | __link_set_decl(dkwedge_methods, struct dkwedge_discovery_method); |
813 | struct dkwedge_discovery_method * const *ddmp; |
814 | struct dkwedge_discovery_method *lddm, *ddm; |
815 | |
816 | rw_init(&dkwedges_lock); |
817 | rw_init(&dkwedge_discovery_methods_lock); |
818 | |
819 | if (config_cfdriver_attach(&dk_cd) != 0) |
820 | panic("dkwedge: unable to attach cfdriver" ); |
821 | if (config_cfattach_attach(dk_cd.cd_name, &dk_ca) != 0) |
822 | panic("dkwedge: unable to attach cfattach" ); |
823 | |
824 | rw_enter(&dkwedge_discovery_methods_lock, RW_WRITER); |
825 | |
826 | LIST_INIT(&dkwedge_discovery_methods); |
827 | |
828 | __link_set_foreach(ddmp, dkwedge_methods) { |
829 | ddm = *ddmp; |
830 | if (ddm == &dummy_discovery_method) |
831 | continue; |
832 | if (LIST_EMPTY(&dkwedge_discovery_methods)) { |
833 | LIST_INSERT_HEAD(&dkwedge_discovery_methods, |
834 | ddm, ddm_list); |
835 | continue; |
836 | } |
837 | LIST_FOREACH(lddm, &dkwedge_discovery_methods, ddm_list) { |
838 | if (ddm->ddm_priority == lddm->ddm_priority) { |
839 | aprint_error("dk-method-%s: method \"%s\" " |
840 | "already exists at priority %d\n" , |
841 | ddm->ddm_name, lddm->ddm_name, |
842 | lddm->ddm_priority); |
843 | /* Not inserted. */ |
844 | break; |
845 | } |
846 | if (ddm->ddm_priority < lddm->ddm_priority) { |
847 | /* Higher priority; insert before. */ |
848 | LIST_INSERT_BEFORE(lddm, ddm, ddm_list); |
849 | break; |
850 | } |
851 | if (LIST_NEXT(lddm, ddm_list) == NULL) { |
852 | /* Last one; insert after. */ |
853 | KASSERT(lddm->ddm_priority < ddm->ddm_priority); |
854 | LIST_INSERT_AFTER(lddm, ddm, ddm_list); |
855 | break; |
856 | } |
857 | } |
858 | } |
859 | |
860 | rw_exit(&dkwedge_discovery_methods_lock); |
861 | } |
862 | |
863 | #ifdef DKWEDGE_AUTODISCOVER |
864 | int dkwedge_autodiscover = 1; |
865 | #else |
866 | int dkwedge_autodiscover = 0; |
867 | #endif |
868 | |
869 | /* |
870 | * dkwedge_discover: [exported function] |
871 | * |
872 | * Discover the wedges on a newly attached disk. |
873 | * Remove all unused wedges on the disk first. |
874 | */ |
875 | void |
876 | dkwedge_discover(struct disk *pdk) |
877 | { |
878 | struct dkwedge_discovery_method *ddm; |
879 | struct vnode *vp; |
880 | int error; |
881 | dev_t pdev; |
882 | |
883 | /* |
884 | * Require people playing with wedges to enable this explicitly. |
885 | */ |
886 | if (dkwedge_autodiscover == 0) |
887 | return; |
888 | |
889 | rw_enter(&dkwedge_discovery_methods_lock, RW_READER); |
890 | |
891 | /* |
892 | * Use the character device for scanning, the block device |
893 | * is busy if there are already wedges attached. |
894 | */ |
895 | error = dkwedge_compute_pdev(pdk->dk_name, &pdev, VCHR); |
896 | if (error) { |
897 | aprint_error("%s: unable to compute pdev, error = %d\n" , |
898 | pdk->dk_name, error); |
899 | goto out; |
900 | } |
901 | |
902 | error = cdevvp(pdev, &vp); |
903 | if (error) { |
904 | aprint_error("%s: unable to find vnode for pdev, error = %d\n" , |
905 | pdk->dk_name, error); |
906 | goto out; |
907 | } |
908 | |
909 | error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
910 | if (error) { |
911 | aprint_error("%s: unable to lock vnode for pdev, error = %d\n" , |
912 | pdk->dk_name, error); |
913 | vrele(vp); |
914 | goto out; |
915 | } |
916 | |
917 | error = VOP_OPEN(vp, FREAD | FSILENT, NOCRED); |
918 | if (error) { |
919 | if (error != ENODEV) |
920 | aprint_error("%s: unable to open device, error = %d\n" , |
921 | pdk->dk_name, error); |
922 | vput(vp); |
923 | goto out; |
924 | } |
925 | VOP_UNLOCK(vp); |
926 | |
927 | /* |
928 | * Remove unused wedges |
929 | */ |
930 | dkwedge_delall1(pdk, true); |
931 | |
932 | /* |
933 | * For each supported partition map type, look to see if |
934 | * this map type exists. If so, parse it and add the |
935 | * corresponding wedges. |
936 | */ |
937 | LIST_FOREACH(ddm, &dkwedge_discovery_methods, ddm_list) { |
938 | error = (*ddm->ddm_discover)(pdk, vp); |
939 | if (error == 0) { |
940 | /* Successfully created wedges; we're done. */ |
941 | break; |
942 | } |
943 | } |
944 | |
945 | error = vn_close(vp, FREAD, NOCRED); |
946 | if (error) { |
947 | aprint_error("%s: unable to close device, error = %d\n" , |
948 | pdk->dk_name, error); |
949 | /* We'll just assume the vnode has been cleaned up. */ |
950 | } |
951 | |
952 | out: |
953 | rw_exit(&dkwedge_discovery_methods_lock); |
954 | } |
955 | |
956 | /* |
957 | * dkwedge_read: |
958 | * |
959 | * Read some data from the specified disk, used for |
960 | * partition discovery. |
961 | */ |
962 | int |
963 | dkwedge_read(struct disk *pdk, struct vnode *vp, daddr_t blkno, |
964 | void *tbuf, size_t len) |
965 | { |
966 | buf_t *bp; |
967 | int error; |
968 | bool isopen; |
969 | dev_t bdev; |
970 | struct vnode *bdvp; |
971 | |
972 | /* |
973 | * The kernel cannot read from a character device vnode |
974 | * as physio() only handles user memory. |
975 | * |
976 | * If the block device has already been opened by a wedge |
977 | * use that vnode and temporarily bump the open counter. |
978 | * |
979 | * Otherwise try to open the block device. |
980 | */ |
981 | |
982 | bdev = devsw_chr2blk(vp->v_rdev); |
983 | |
984 | mutex_enter(&pdk->dk_rawlock); |
985 | if (pdk->dk_rawopens != 0) { |
986 | KASSERT(pdk->dk_rawvp != NULL); |
987 | isopen = true; |
988 | ++pdk->dk_rawopens; |
989 | bdvp = pdk->dk_rawvp; |
990 | error = 0; |
991 | } else { |
992 | isopen = false; |
993 | error = dk_open_parent(bdev, FREAD, &bdvp); |
994 | } |
995 | mutex_exit(&pdk->dk_rawlock); |
996 | |
997 | if (error) |
998 | return error; |
999 | |
1000 | bp = getiobuf(bdvp, true); |
1001 | bp->b_flags = B_READ; |
1002 | bp->b_cflags = BC_BUSY; |
1003 | bp->b_dev = bdev; |
1004 | bp->b_data = tbuf; |
1005 | bp->b_bufsize = bp->b_bcount = len; |
1006 | bp->b_blkno = blkno; |
1007 | bp->b_cylinder = 0; |
1008 | bp->b_error = 0; |
1009 | |
1010 | VOP_STRATEGY(bdvp, bp); |
1011 | error = biowait(bp); |
1012 | putiobuf(bp); |
1013 | |
1014 | mutex_enter(&pdk->dk_rawlock); |
1015 | if (isopen) { |
1016 | --pdk->dk_rawopens; |
1017 | } else { |
1018 | dk_close_parent(bdvp, FREAD); |
1019 | } |
1020 | mutex_exit(&pdk->dk_rawlock); |
1021 | |
1022 | return error; |
1023 | } |
1024 | |
1025 | /* |
1026 | * dkwedge_lookup: |
1027 | * |
1028 | * Look up a dkwedge_softc based on the provided dev_t. |
1029 | */ |
1030 | static struct dkwedge_softc * |
1031 | dkwedge_lookup(dev_t dev) |
1032 | { |
1033 | int unit = minor(dev); |
1034 | |
1035 | if (unit >= ndkwedges) |
1036 | return (NULL); |
1037 | |
1038 | KASSERT(dkwedges != NULL); |
1039 | |
1040 | return (dkwedges[unit]); |
1041 | } |
1042 | |
1043 | static int |
1044 | dk_open_parent(dev_t dev, int mode, struct vnode **vpp) |
1045 | { |
1046 | struct vnode *vp; |
1047 | int error; |
1048 | |
1049 | error = bdevvp(dev, &vp); |
1050 | if (error) |
1051 | return error; |
1052 | |
1053 | error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
1054 | if (error) { |
1055 | vrele(vp); |
1056 | return error; |
1057 | } |
1058 | error = VOP_OPEN(vp, mode, NOCRED); |
1059 | if (error) { |
1060 | vput(vp); |
1061 | return error; |
1062 | } |
1063 | |
1064 | /* VOP_OPEN() doesn't do this for us. */ |
1065 | if (mode & FWRITE) { |
1066 | mutex_enter(vp->v_interlock); |
1067 | vp->v_writecount++; |
1068 | mutex_exit(vp->v_interlock); |
1069 | } |
1070 | |
1071 | VOP_UNLOCK(vp); |
1072 | |
1073 | *vpp = vp; |
1074 | |
1075 | return 0; |
1076 | } |
1077 | |
1078 | static int |
1079 | dk_close_parent(struct vnode *vp, int mode) |
1080 | { |
1081 | int error; |
1082 | |
1083 | error = vn_close(vp, mode, NOCRED); |
1084 | return error; |
1085 | } |
1086 | |
1087 | /* |
1088 | * dkopen: [devsw entry point] |
1089 | * |
1090 | * Open a wedge. |
1091 | */ |
1092 | static int |
1093 | dkopen(dev_t dev, int flags, int fmt, struct lwp *l) |
1094 | { |
1095 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1096 | struct vnode *vp; |
1097 | int error = 0; |
1098 | |
1099 | if (sc == NULL) |
1100 | return (ENODEV); |
1101 | if (sc->sc_state != DKW_STATE_RUNNING) |
1102 | return (ENXIO); |
1103 | |
1104 | /* |
1105 | * We go through a complicated little dance to only open the parent |
1106 | * vnode once per wedge, no matter how many times the wedge is |
1107 | * opened. The reason? We see one dkopen() per open call, but |
1108 | * only dkclose() on the last close. |
1109 | */ |
1110 | mutex_enter(&sc->sc_dk.dk_openlock); |
1111 | mutex_enter(&sc->sc_parent->dk_rawlock); |
1112 | if (sc->sc_dk.dk_openmask == 0) { |
1113 | if (sc->sc_parent->dk_rawopens == 0) { |
1114 | KASSERT(sc->sc_parent->dk_rawvp == NULL); |
1115 | error = dk_open_parent(sc->sc_pdev, FREAD | FWRITE, &vp); |
1116 | if (error) |
1117 | goto popen_fail; |
1118 | sc->sc_parent->dk_rawvp = vp; |
1119 | } |
1120 | sc->sc_parent->dk_rawopens++; |
1121 | } |
1122 | if (fmt == S_IFCHR) |
1123 | sc->sc_dk.dk_copenmask |= 1; |
1124 | else |
1125 | sc->sc_dk.dk_bopenmask |= 1; |
1126 | sc->sc_dk.dk_openmask = |
1127 | sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; |
1128 | |
1129 | popen_fail: |
1130 | mutex_exit(&sc->sc_parent->dk_rawlock); |
1131 | mutex_exit(&sc->sc_dk.dk_openlock); |
1132 | return (error); |
1133 | } |
1134 | |
1135 | /* |
1136 | * Caller must hold sc->sc_dk.dk_openlock and sc->sc_parent->dk_rawlock. |
1137 | */ |
1138 | static int |
1139 | dklastclose(struct dkwedge_softc *sc) |
1140 | { |
1141 | int error = 0, doclose; |
1142 | |
1143 | doclose = 0; |
1144 | if (sc->sc_parent->dk_rawopens > 0) { |
1145 | if (--sc->sc_parent->dk_rawopens == 0) |
1146 | doclose = 1; |
1147 | } |
1148 | |
1149 | mutex_exit(&sc->sc_parent->dk_rawlock); |
1150 | mutex_exit(&sc->sc_dk.dk_openlock); |
1151 | |
1152 | if (doclose) { |
1153 | KASSERT(sc->sc_parent->dk_rawvp != NULL); |
1154 | dk_close_parent(sc->sc_parent->dk_rawvp, FREAD | FWRITE); |
1155 | sc->sc_parent->dk_rawvp = NULL; |
1156 | } |
1157 | |
1158 | return error; |
1159 | } |
1160 | |
1161 | /* |
1162 | * dkclose: [devsw entry point] |
1163 | * |
1164 | * Close a wedge. |
1165 | */ |
1166 | static int |
1167 | dkclose(dev_t dev, int flags, int fmt, struct lwp *l) |
1168 | { |
1169 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1170 | int error = 0; |
1171 | |
1172 | if (sc == NULL) |
1173 | return (ENODEV); |
1174 | if (sc->sc_state != DKW_STATE_RUNNING) |
1175 | return (ENXIO); |
1176 | |
1177 | KASSERT(sc->sc_dk.dk_openmask != 0); |
1178 | |
1179 | mutex_enter(&sc->sc_dk.dk_openlock); |
1180 | mutex_enter(&sc->sc_parent->dk_rawlock); |
1181 | |
1182 | if (fmt == S_IFCHR) |
1183 | sc->sc_dk.dk_copenmask &= ~1; |
1184 | else |
1185 | sc->sc_dk.dk_bopenmask &= ~1; |
1186 | sc->sc_dk.dk_openmask = |
1187 | sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; |
1188 | |
1189 | if (sc->sc_dk.dk_openmask == 0) |
1190 | error = dklastclose(sc); /* releases locks */ |
1191 | else { |
1192 | mutex_exit(&sc->sc_parent->dk_rawlock); |
1193 | mutex_exit(&sc->sc_dk.dk_openlock); |
1194 | } |
1195 | |
1196 | return (error); |
1197 | } |
1198 | |
1199 | /* |
1200 | * dkstragegy: [devsw entry point] |
1201 | * |
1202 | * Perform I/O based on the wedge I/O strategy. |
1203 | */ |
1204 | static void |
1205 | dkstrategy(struct buf *bp) |
1206 | { |
1207 | struct dkwedge_softc *sc = dkwedge_lookup(bp->b_dev); |
1208 | uint64_t p_size, p_offset; |
1209 | int s; |
1210 | |
1211 | if (sc == NULL) { |
1212 | bp->b_error = ENODEV; |
1213 | goto done; |
1214 | } |
1215 | |
1216 | if (sc->sc_state != DKW_STATE_RUNNING || |
1217 | sc->sc_parent->dk_rawvp == NULL) { |
1218 | bp->b_error = ENXIO; |
1219 | goto done; |
1220 | } |
1221 | |
1222 | /* If it's an empty transfer, wake up the top half now. */ |
1223 | if (bp->b_bcount == 0) |
1224 | goto done; |
1225 | |
1226 | p_offset = sc->sc_offset << sc->sc_parent->dk_blkshift; |
1227 | p_size = sc->sc_size << sc->sc_parent->dk_blkshift; |
1228 | |
1229 | /* Make sure it's in-range. */ |
1230 | if (bounds_check_with_mediasize(bp, DEV_BSIZE, p_size) <= 0) |
1231 | goto done; |
1232 | |
1233 | /* Translate it to the parent's raw LBA. */ |
1234 | bp->b_rawblkno = bp->b_blkno + p_offset; |
1235 | |
1236 | /* Place it in the queue and start I/O on the unit. */ |
1237 | s = splbio(); |
1238 | sc->sc_iopend++; |
1239 | bufq_put(sc->sc_bufq, bp); |
1240 | dkstart(sc); |
1241 | splx(s); |
1242 | return; |
1243 | |
1244 | done: |
1245 | bp->b_resid = bp->b_bcount; |
1246 | biodone(bp); |
1247 | } |
1248 | |
1249 | /* |
1250 | * dkstart: |
1251 | * |
1252 | * Start I/O that has been enqueued on the wedge. |
1253 | * NOTE: Must be called at splbio()! |
1254 | */ |
1255 | static void |
1256 | dkstart(struct dkwedge_softc *sc) |
1257 | { |
1258 | struct vnode *vp; |
1259 | struct buf *bp, *nbp; |
1260 | |
1261 | /* Do as much work as has been enqueued. */ |
1262 | while ((bp = bufq_peek(sc->sc_bufq)) != NULL) { |
1263 | if (sc->sc_state != DKW_STATE_RUNNING) { |
1264 | (void) bufq_get(sc->sc_bufq); |
1265 | if (sc->sc_iopend-- == 1 && |
1266 | (sc->sc_flags & DK_F_WAIT_DRAIN) != 0) { |
1267 | sc->sc_flags &= ~DK_F_WAIT_DRAIN; |
1268 | wakeup(&sc->sc_iopend); |
1269 | } |
1270 | bp->b_error = ENXIO; |
1271 | bp->b_resid = bp->b_bcount; |
1272 | biodone(bp); |
1273 | } |
1274 | |
1275 | /* Instrumentation. */ |
1276 | disk_busy(&sc->sc_dk); |
1277 | |
1278 | nbp = getiobuf(sc->sc_parent->dk_rawvp, false); |
1279 | if (nbp == NULL) { |
1280 | /* |
1281 | * No resources to run this request; leave the |
1282 | * buffer queued up, and schedule a timer to |
1283 | * restart the queue in 1/2 a second. |
1284 | */ |
1285 | disk_unbusy(&sc->sc_dk, 0, bp->b_flags & B_READ); |
1286 | callout_schedule(&sc->sc_restart_ch, hz / 2); |
1287 | return; |
1288 | } |
1289 | |
1290 | (void) bufq_get(sc->sc_bufq); |
1291 | |
1292 | nbp->b_data = bp->b_data; |
1293 | nbp->b_flags = bp->b_flags; |
1294 | nbp->b_oflags = bp->b_oflags; |
1295 | nbp->b_cflags = bp->b_cflags; |
1296 | nbp->b_iodone = dkiodone; |
1297 | nbp->b_proc = bp->b_proc; |
1298 | nbp->b_blkno = bp->b_rawblkno; |
1299 | nbp->b_dev = sc->sc_parent->dk_rawvp->v_rdev; |
1300 | nbp->b_bcount = bp->b_bcount; |
1301 | nbp->b_private = bp; |
1302 | BIO_COPYPRIO(nbp, bp); |
1303 | |
1304 | vp = nbp->b_vp; |
1305 | if ((nbp->b_flags & B_READ) == 0) { |
1306 | mutex_enter(vp->v_interlock); |
1307 | vp->v_numoutput++; |
1308 | mutex_exit(vp->v_interlock); |
1309 | } |
1310 | VOP_STRATEGY(vp, nbp); |
1311 | } |
1312 | } |
1313 | |
1314 | /* |
1315 | * dkiodone: |
1316 | * |
1317 | * I/O to a wedge has completed; alert the top half. |
1318 | */ |
1319 | static void |
1320 | dkiodone(struct buf *bp) |
1321 | { |
1322 | struct buf *obp = bp->b_private; |
1323 | struct dkwedge_softc *sc = dkwedge_lookup(obp->b_dev); |
1324 | |
1325 | int s = splbio(); |
1326 | |
1327 | if (bp->b_error != 0) |
1328 | obp->b_error = bp->b_error; |
1329 | obp->b_resid = bp->b_resid; |
1330 | putiobuf(bp); |
1331 | |
1332 | if (sc->sc_iopend-- == 1 && (sc->sc_flags & DK_F_WAIT_DRAIN) != 0) { |
1333 | sc->sc_flags &= ~DK_F_WAIT_DRAIN; |
1334 | wakeup(&sc->sc_iopend); |
1335 | } |
1336 | |
1337 | disk_unbusy(&sc->sc_dk, obp->b_bcount - obp->b_resid, |
1338 | obp->b_flags & B_READ); |
1339 | |
1340 | biodone(obp); |
1341 | |
1342 | /* Kick the queue in case there is more work we can do. */ |
1343 | dkstart(sc); |
1344 | splx(s); |
1345 | } |
1346 | |
1347 | /* |
1348 | * dkrestart: |
1349 | * |
1350 | * Restart the work queue after it was stalled due to |
1351 | * a resource shortage. Invoked via a callout. |
1352 | */ |
1353 | static void |
1354 | dkrestart(void *v) |
1355 | { |
1356 | struct dkwedge_softc *sc = v; |
1357 | int s; |
1358 | |
1359 | s = splbio(); |
1360 | dkstart(sc); |
1361 | splx(s); |
1362 | } |
1363 | |
1364 | /* |
1365 | * dkminphys: |
1366 | * |
1367 | * Call parent's minphys function. |
1368 | */ |
1369 | static void |
1370 | dkminphys(struct buf *bp) |
1371 | { |
1372 | struct dkwedge_softc *sc = dkwedge_lookup(bp->b_dev); |
1373 | dev_t dev; |
1374 | |
1375 | dev = bp->b_dev; |
1376 | bp->b_dev = sc->sc_pdev; |
1377 | (*sc->sc_parent->dk_driver->d_minphys)(bp); |
1378 | bp->b_dev = dev; |
1379 | } |
1380 | |
1381 | /* |
1382 | * dkread: [devsw entry point] |
1383 | * |
1384 | * Read from a wedge. |
1385 | */ |
1386 | static int |
1387 | dkread(dev_t dev, struct uio *uio, int flags) |
1388 | { |
1389 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1390 | |
1391 | if (sc == NULL) |
1392 | return (ENODEV); |
1393 | if (sc->sc_state != DKW_STATE_RUNNING) |
1394 | return (ENXIO); |
1395 | |
1396 | return (physio(dkstrategy, NULL, dev, B_READ, dkminphys, uio)); |
1397 | } |
1398 | |
1399 | /* |
1400 | * dkwrite: [devsw entry point] |
1401 | * |
1402 | * Write to a wedge. |
1403 | */ |
1404 | static int |
1405 | dkwrite(dev_t dev, struct uio *uio, int flags) |
1406 | { |
1407 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1408 | |
1409 | if (sc == NULL) |
1410 | return (ENODEV); |
1411 | if (sc->sc_state != DKW_STATE_RUNNING) |
1412 | return (ENXIO); |
1413 | |
1414 | return (physio(dkstrategy, NULL, dev, B_WRITE, dkminphys, uio)); |
1415 | } |
1416 | |
1417 | /* |
1418 | * dkioctl: [devsw entry point] |
1419 | * |
1420 | * Perform an ioctl request on a wedge. |
1421 | */ |
1422 | static int |
1423 | dkioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
1424 | { |
1425 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1426 | int error = 0; |
1427 | |
1428 | if (sc == NULL) |
1429 | return (ENODEV); |
1430 | if (sc->sc_state != DKW_STATE_RUNNING) |
1431 | return (ENXIO); |
1432 | if (sc->sc_parent->dk_rawvp == NULL) |
1433 | return (ENXIO); |
1434 | |
1435 | /* |
1436 | * We pass NODEV instead of our device to indicate we don't |
1437 | * want to handle disklabel ioctls |
1438 | */ |
1439 | error = disk_ioctl(&sc->sc_dk, NODEV, cmd, data, flag, l); |
1440 | if (error != EPASSTHROUGH) |
1441 | return (error); |
1442 | |
1443 | error = 0; |
1444 | |
1445 | switch (cmd) { |
1446 | case DIOCCACHESYNC: |
1447 | /* |
1448 | * XXX Do we really need to care about having a writable |
1449 | * file descriptor here? |
1450 | */ |
1451 | if ((flag & FWRITE) == 0) |
1452 | error = EBADF; |
1453 | else |
1454 | error = VOP_IOCTL(sc->sc_parent->dk_rawvp, |
1455 | cmd, data, flag, |
1456 | l != NULL ? l->l_cred : NOCRED); |
1457 | break; |
1458 | case DIOCGWEDGEINFO: |
1459 | { |
1460 | struct dkwedge_info *dkw = (void *) data; |
1461 | |
1462 | strlcpy(dkw->dkw_devname, device_xname(sc->sc_dev), |
1463 | sizeof(dkw->dkw_devname)); |
1464 | memcpy(dkw->dkw_wname, sc->sc_wname, sizeof(dkw->dkw_wname)); |
1465 | dkw->dkw_wname[sizeof(dkw->dkw_wname) - 1] = '\0'; |
1466 | strcpy(dkw->dkw_parent, sc->sc_parent->dk_name); |
1467 | dkw->dkw_offset = sc->sc_offset; |
1468 | dkw->dkw_size = sc->sc_size; |
1469 | strcpy(dkw->dkw_ptype, sc->sc_ptype); |
1470 | |
1471 | break; |
1472 | } |
1473 | |
1474 | default: |
1475 | error = ENOTTY; |
1476 | } |
1477 | |
1478 | return (error); |
1479 | } |
1480 | |
1481 | /* |
1482 | * dkdiscard: [devsw entry point] |
1483 | * |
1484 | * Perform a discard-range request on a wedge. |
1485 | */ |
1486 | static int |
1487 | dkdiscard(dev_t dev, off_t pos, off_t len) |
1488 | { |
1489 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1490 | unsigned shift; |
1491 | off_t offset, maxlen; |
1492 | |
1493 | if (sc == NULL) |
1494 | return (ENODEV); |
1495 | if (sc->sc_state != DKW_STATE_RUNNING) |
1496 | return (ENXIO); |
1497 | if (sc->sc_parent->dk_rawvp == NULL) |
1498 | return (ENXIO); |
1499 | |
1500 | shift = (sc->sc_parent->dk_blkshift + DEV_BSHIFT); |
1501 | KASSERT(__type_fit(off_t, sc->sc_size)); |
1502 | KASSERT(__type_fit(off_t, sc->sc_offset)); |
1503 | KASSERT(0 <= sc->sc_offset); |
1504 | KASSERT(sc->sc_size <= (__type_max(off_t) >> shift)); |
1505 | KASSERT(sc->sc_offset <= ((__type_max(off_t) >> shift) - sc->sc_size)); |
1506 | offset = ((off_t)sc->sc_offset << shift); |
1507 | maxlen = ((off_t)sc->sc_size << shift); |
1508 | |
1509 | if (len > maxlen) |
1510 | return (EINVAL); |
1511 | if (pos > (maxlen - len)) |
1512 | return (EINVAL); |
1513 | |
1514 | pos += offset; |
1515 | return VOP_FDISCARD(sc->sc_parent->dk_rawvp, pos, len); |
1516 | } |
1517 | |
1518 | /* |
1519 | * dksize: [devsw entry point] |
1520 | * |
1521 | * Query the size of a wedge for the purpose of performing a dump |
1522 | * or for swapping to. |
1523 | */ |
1524 | static int |
1525 | dksize(dev_t dev) |
1526 | { |
1527 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1528 | int rv = -1; |
1529 | |
1530 | if (sc == NULL) |
1531 | return (-1); |
1532 | if (sc->sc_state != DKW_STATE_RUNNING) |
1533 | return (-1); |
1534 | |
1535 | mutex_enter(&sc->sc_dk.dk_openlock); |
1536 | mutex_enter(&sc->sc_parent->dk_rawlock); |
1537 | |
1538 | /* Our content type is static, no need to open the device. */ |
1539 | |
1540 | if (strcmp(sc->sc_ptype, DKW_PTYPE_SWAP) == 0) { |
1541 | /* Saturate if we are larger than INT_MAX. */ |
1542 | if (sc->sc_size > INT_MAX) |
1543 | rv = INT_MAX; |
1544 | else |
1545 | rv = (int) sc->sc_size; |
1546 | } |
1547 | |
1548 | mutex_exit(&sc->sc_parent->dk_rawlock); |
1549 | mutex_exit(&sc->sc_dk.dk_openlock); |
1550 | |
1551 | return (rv); |
1552 | } |
1553 | |
1554 | /* |
1555 | * dkdump: [devsw entry point] |
1556 | * |
1557 | * Perform a crash dump to a wedge. |
1558 | */ |
1559 | static int |
1560 | dkdump(dev_t dev, daddr_t blkno, void *va, size_t size) |
1561 | { |
1562 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1563 | const struct bdevsw *bdev; |
1564 | int rv = 0; |
1565 | |
1566 | if (sc == NULL) |
1567 | return (ENODEV); |
1568 | if (sc->sc_state != DKW_STATE_RUNNING) |
1569 | return (ENXIO); |
1570 | |
1571 | mutex_enter(&sc->sc_dk.dk_openlock); |
1572 | mutex_enter(&sc->sc_parent->dk_rawlock); |
1573 | |
1574 | /* Our content type is static, no need to open the device. */ |
1575 | |
1576 | if (strcmp(sc->sc_ptype, DKW_PTYPE_SWAP) != 0 && |
1577 | strcmp(sc->sc_ptype, DKW_PTYPE_RAID) != 0) { |
1578 | rv = ENXIO; |
1579 | goto out; |
1580 | } |
1581 | if (size % DEV_BSIZE != 0) { |
1582 | rv = EINVAL; |
1583 | goto out; |
1584 | } |
1585 | if (blkno + size / DEV_BSIZE > sc->sc_size) { |
1586 | printf("%s: blkno (%" PRIu64 ") + size / DEV_BSIZE (%zu) > " |
1587 | "sc->sc_size (%" PRIu64 ")\n" , __func__, blkno, |
1588 | size / DEV_BSIZE, sc->sc_size); |
1589 | rv = EINVAL; |
1590 | goto out; |
1591 | } |
1592 | |
1593 | bdev = bdevsw_lookup(sc->sc_pdev); |
1594 | rv = (*bdev->d_dump)(sc->sc_pdev, blkno + sc->sc_offset, va, size); |
1595 | |
1596 | out: |
1597 | mutex_exit(&sc->sc_parent->dk_rawlock); |
1598 | mutex_exit(&sc->sc_dk.dk_openlock); |
1599 | |
1600 | return rv; |
1601 | } |
1602 | |
1603 | /* |
1604 | * config glue |
1605 | */ |
1606 | |
1607 | /* |
1608 | * dkwedge_find_partition |
1609 | * |
1610 | * Find wedge corresponding to the specified parent name |
1611 | * and offset/length. |
1612 | */ |
1613 | device_t |
1614 | dkwedge_find_partition(device_t parent, daddr_t startblk, uint64_t nblks) |
1615 | { |
1616 | struct dkwedge_softc *sc; |
1617 | int i; |
1618 | device_t wedge = NULL; |
1619 | |
1620 | rw_enter(&dkwedges_lock, RW_READER); |
1621 | for (i = 0; i < ndkwedges; i++) { |
1622 | if ((sc = dkwedges[i]) == NULL) |
1623 | continue; |
1624 | if (strcmp(sc->sc_parent->dk_name, device_xname(parent)) == 0 && |
1625 | sc->sc_offset == startblk && |
1626 | sc->sc_size == nblks) { |
1627 | if (wedge) { |
1628 | printf("WARNING: double match for boot wedge " |
1629 | "(%s, %s)\n" , |
1630 | device_xname(wedge), |
1631 | device_xname(sc->sc_dev)); |
1632 | continue; |
1633 | } |
1634 | wedge = sc->sc_dev; |
1635 | } |
1636 | } |
1637 | rw_exit(&dkwedges_lock); |
1638 | |
1639 | return wedge; |
1640 | } |
1641 | |
1642 | const char * |
1643 | dkwedge_get_parent_name(dev_t dev) |
1644 | { |
1645 | /* XXX: perhaps do this in lookup? */ |
1646 | int bmaj = bdevsw_lookup_major(&dk_bdevsw); |
1647 | int cmaj = cdevsw_lookup_major(&dk_cdevsw); |
1648 | if (major(dev) != bmaj && major(dev) != cmaj) |
1649 | return NULL; |
1650 | struct dkwedge_softc *sc = dkwedge_lookup(dev); |
1651 | if (sc == NULL) |
1652 | return NULL; |
1653 | return sc->sc_parent->dk_name; |
1654 | } |
1655 | |
1656 | |