1 /*
2 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
29 *
30 * File: bsd/kern/kern_symfile.c
31 *
32 * HISTORY
33 */
34
35 #include <mach/vm_param.h>
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/signalvar.h>
40 #include <sys/resourcevar.h>
41 #include <sys/namei.h>
42 #include <sys/vnode_internal.h>
43 #include <sys/proc_internal.h>
44 #include <sys/kauth.h>
45 #include <sys/timeb.h>
46 #include <sys/times.h>
47 #include <sys/acct.h>
48 #include <sys/file_internal.h>
49 #include <sys/uio.h>
50 #include <sys/kernel.h>
51 #include <sys/stat.h>
52 #include <sys/disk.h>
53 #include <sys/conf.h>
54 #include <sys/content_protection.h>
55 #include <sys/fsctl.h>
56
57 #include <mach-o/loader.h>
58 #include <mach-o/nlist.h>
59
60 #include <kern/kalloc.h>
61 #include <vm/vm_kern.h>
62 #include <pexpert/pexpert.h>
63 #include <IOKit/IOPolledInterface.h>
64
65 #define HIBERNATE_MIN_PHYSICAL_LBA_512 (34)
66 #define HIBERNATE_MIN_PHYSICAL_LBA_4096 (6)
67 #define HIBERNATE_MIN_FILE_SIZE (1024*1024)
68
69 /* This function is called from kern_sysctl in the current process context;
70 * it is exported with the System6.0.exports, but this appears to be a legacy
71 * export, as there are no internal consumers.
72 */
73 int
74 get_kernel_symfile(__unused proc_t p, __unused char const **symfile);
75 int
get_kernel_symfile(__unused proc_t p,__unused char const ** symfile)76 get_kernel_symfile(__unused proc_t p, __unused char const **symfile)
77 {
78 return KERN_FAILURE;
79 }
80
81 struct kern_direct_file_io_ref_t {
82 vfs_context_t ctx;
83 struct vnode * vp;
84 char * name;
85 size_t namesize;
86 dev_t device;
87 uint32_t blksize;
88 off_t filelength;
89 char cf;
90 char pinned;
91 char frozen;
92 char wbcranged;
93 };
94
95
96 static int
file_ioctl(void * p1,void * p2,u_long theIoctl,caddr_t result)97 file_ioctl(void * p1, void * p2, u_long theIoctl, caddr_t result)
98 {
99 dev_t device = *(dev_t*) p1;
100
101 return (*bdevsw[major(device)].d_ioctl)
102 (device, theIoctl, result, S_IFBLK, p2);
103 }
104
105 static int
device_ioctl(void * p1,__unused void * p2,u_long theIoctl,caddr_t result)106 device_ioctl(void * p1, __unused void * p2, u_long theIoctl, caddr_t result)
107 {
108 return VNOP_IOCTL(p1, theIoctl, result, 0, p2);
109 }
110
111 static int
kern_ioctl_file_extents(struct kern_direct_file_io_ref_t * ref,u_long theIoctl,off_t offset,off_t end)112 kern_ioctl_file_extents(struct kern_direct_file_io_ref_t * ref, u_long theIoctl, off_t offset, off_t end)
113 {
114 int error = 0;
115 int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
116 void * p1;
117 void * p2;
118 uint64_t fileblk = 0;
119 size_t filechunk = 0;
120 dk_extent_t extent;
121 dk_unmap_t unmap;
122 _dk_cs_pin_t pin;
123
124 bzero(&extent, sizeof(dk_extent_t));
125 bzero(&unmap, sizeof(dk_unmap_t));
126 bzero(&pin, sizeof(pin));
127 if (ref->vp->v_type == VREG) {
128 p1 = &ref->device;
129 p2 = kernproc;
130 do_ioctl = &file_ioctl;
131 } else {
132 /* Partition. */
133 p1 = ref->vp;
134 p2 = ref->ctx;
135 do_ioctl = &device_ioctl;
136 }
137
138 if (_DKIOCCSPINEXTENT == theIoctl) {
139 /* Tell CS the image size, so it knows whether to place the subsequent pins SSD/HDD */
140 pin.cp_extent.length = end;
141 pin.cp_flags = _DKIOCCSHIBERNATEIMGSIZE;
142 (void) do_ioctl(p1, p2, _DKIOCCSPINEXTENT, (caddr_t)&pin);
143 } else if (_DKIOCCSUNPINEXTENT == theIoctl) {
144 /* Tell CS hibernation is done, so it can stop blocking overlapping writes */
145 pin.cp_flags = _DKIOCCSPINDISCARDDENYLIST;
146 (void) do_ioctl(p1, p2, _DKIOCCSUNPINEXTENT, (caddr_t)&pin);
147 }
148
149 for (; offset < end; offset += filechunk) {
150 if (ref->vp->v_type == VREG) {
151 daddr64_t blkno;
152 filechunk = 1 * 1024 * 1024 * 1024;
153 if (filechunk > (size_t)(end - offset)) {
154 filechunk = (size_t)(end - offset);
155 }
156 error = VNOP_BLOCKMAP(ref->vp, offset, filechunk, &blkno,
157 &filechunk, NULL, VNODE_WRITE | VNODE_BLOCKMAP_NO_TRACK, NULL);
158 if (error) {
159 break;
160 }
161 if (-1LL == blkno) {
162 continue;
163 }
164 fileblk = blkno * ref->blksize;
165 } else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR)) {
166 fileblk = offset;
167 filechunk = (unsigned long)((ref->filelength > ULONG_MAX) ? ULONG_MAX: ref->filelength);
168 }
169
170 if (DKIOCUNMAP == theIoctl) {
171 extent.offset = fileblk;
172 extent.length = filechunk;
173 unmap.extents = &extent;
174 unmap.extentsCount = 1;
175 error = do_ioctl(p1, p2, theIoctl, (caddr_t)&unmap);
176 // printf("DKIOCUNMAP(%d) 0x%qx, 0x%qx\n", error, extent.offset, extent.length);
177 } else if (_DKIOCCSPINEXTENT == theIoctl) {
178 pin.cp_extent.offset = fileblk;
179 pin.cp_extent.length = filechunk;
180 pin.cp_flags = _DKIOCCSPINFORHIBERNATION;
181 error = do_ioctl(p1, p2, theIoctl, (caddr_t)&pin);
182 if (error && (ENOTTY != error)) {
183 printf("_DKIOCCSPINEXTENT(%d) 0x%qx, 0x%qx\n", error, pin.cp_extent.offset, pin.cp_extent.length);
184 }
185 } else if (_DKIOCCSUNPINEXTENT == theIoctl) {
186 pin.cp_extent.offset = fileblk;
187 pin.cp_extent.length = filechunk;
188 pin.cp_flags = _DKIOCCSPINFORHIBERNATION;
189 error = do_ioctl(p1, p2, theIoctl, (caddr_t)&pin);
190 if (error && (ENOTTY != error)) {
191 printf("_DKIOCCSUNPINEXTENT(%d) 0x%qx, 0x%qx\n", error, pin.cp_extent.offset, pin.cp_extent.length);
192 }
193 } else {
194 error = EINVAL;
195 }
196
197 if (error) {
198 break;
199 }
200 }
201 return error;
202 }
203
204 extern uint32_t freespace_mb(vnode_t vp);
205
206 struct kern_direct_file_io_ref_t *
kern_open_file_for_direct_io(const char * name,uint32_t iflags,kern_get_file_extents_callback_t callback,void * callback_ref,off_t set_file_size,off_t fs_free_size,off_t write_file_offset,void * write_file_addr,size_t write_file_len,dev_t * partition_device_result,dev_t * image_device_result,uint64_t * partitionbase_result,uint64_t * maxiocount_result,uint32_t * oflags)207 kern_open_file_for_direct_io(const char * name,
208 uint32_t iflags,
209 kern_get_file_extents_callback_t callback,
210 void * callback_ref,
211 off_t set_file_size,
212 off_t fs_free_size,
213 off_t write_file_offset,
214 void * write_file_addr,
215 size_t write_file_len,
216 dev_t * partition_device_result,
217 dev_t * image_device_result,
218 uint64_t * partitionbase_result,
219 uint64_t * maxiocount_result,
220 uint32_t * oflags)
221 {
222 struct kern_direct_file_io_ref_t * ref;
223
224 proc_t p;
225 struct vnode_attr va;
226 dk_apfs_wbc_range_t wbc_range;
227 int error;
228 off_t f_offset;
229 uint64_t fileblk = 0;
230 size_t filechunk = 0;
231 uint64_t physoffset, minoffset;
232 dev_t device;
233 dev_t target = 0;
234 int isssd = 0;
235 uint32_t flags = 0;
236 uint32_t blksize;
237 off_t maxiocount, count, segcount, wbctotal;
238 boolean_t locked = FALSE;
239 int fmode;
240 mode_t cmode;
241 struct nameidata nd;
242 u_int32_t ndflags;
243 off_t mpFree;
244
245 wbc_range.count = 0;
246
247 int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
248 do_ioctl = NULL;
249 void * p1 = NULL;
250 void * p2 = NULL;
251
252 error = EFAULT;
253
254 ref = kalloc_type(struct kern_direct_file_io_ref_t,
255 Z_WAITOK | Z_ZERO | Z_NOFAIL);
256
257 p = kernproc;
258 ref->ctx = vfs_context_kernel();
259 ref->namesize = strlen(name) + 1;
260 ref->name = kalloc_data(ref->namesize, Z_WAITOK | Z_NOFAIL);
261 strlcpy(ref->name, name, ref->namesize);
262
263 fmode = (kIOPolledFileCreate & iflags) ? (O_CREAT | FWRITE) : FWRITE;
264 cmode = S_IRUSR | S_IWUSR;
265 ndflags = NOFOLLOW;
266 NDINIT(&nd, LOOKUP, OP_OPEN, ndflags, UIO_SYSSPACE, CAST_USER_ADDR_T(ref->name), ref->ctx);
267 VATTR_INIT(&va);
268 VATTR_SET(&va, va_mode, cmode);
269 VATTR_SET(&va, va_dataprotect_flags, VA_DP_RAWENCRYPTED);
270 VATTR_SET(&va, va_dataprotect_class, PROTECTION_CLASS_D);
271 if ((error = vn_open_auth(&nd, &fmode, &va, NULLVP))) {
272 kprintf("vn_open_auth(fmode: %d, cmode: %d) failed with error: %d\n", fmode, cmode, error);
273 goto out;
274 }
275
276 ref->vp = nd.ni_vp;
277 if (ref->vp->v_type == VREG) {
278 vnode_lock_spin(ref->vp);
279 SET(ref->vp->v_flag, VSWAP);
280 vnode_unlock(ref->vp);
281 }
282
283 if (write_file_addr && write_file_len) {
284 if ((error = kern_write_file(ref, write_file_offset, write_file_addr, write_file_len, IO_SKIP_ENCRYPTION))) {
285 kprintf("kern_write_file() failed with error: %d\n", error);
286 goto out;
287 }
288 }
289
290 VATTR_INIT(&va);
291 VATTR_WANTED(&va, va_rdev);
292 VATTR_WANTED(&va, va_fsid);
293 VATTR_WANTED(&va, va_devid);
294 VATTR_WANTED(&va, va_data_size);
295 VATTR_WANTED(&va, va_data_alloc);
296 VATTR_WANTED(&va, va_nlink);
297 error = EFAULT;
298 if (vnode_getattr(ref->vp, &va, ref->ctx)) {
299 goto out;
300 }
301
302 wbctotal = 0;
303 mpFree = freespace_mb(ref->vp);
304 mpFree <<= 20;
305 kprintf("kern_direct_file(%s): vp size %qd, alloc %qd, mp free %qd, keep free %qd\n",
306 ref->name, va.va_data_size, va.va_data_alloc, mpFree, fs_free_size);
307
308 if (ref->vp->v_type == VREG) {
309 /* Don't dump files with links. */
310 if (va.va_nlink != 1) {
311 goto out;
312 }
313
314 /* Don't dump on fs without backing device. */
315 if (!VATTR_IS_SUPPORTED(&va, va_devid)) {
316 kprintf("kern_direct_file(%s): Not backed by block device.\n", ref->name);
317 error = ENODEV;
318 goto out;
319 }
320 device = va.va_devid;
321 ref->filelength = va.va_data_size;
322
323 p1 = &device;
324 p2 = p;
325 do_ioctl = &file_ioctl;
326
327 if (kIOPolledFileHibernate & iflags) {
328 error = do_ioctl(p1, p2, DKIOCAPFSGETWBCRANGE, (caddr_t) &wbc_range);
329 ref->wbcranged = (error == 0);
330 }
331 if (ref->wbcranged) {
332 uint32_t idx;
333 assert(wbc_range.count <= (sizeof(wbc_range.extents) / sizeof(wbc_range.extents[0])));
334 for (idx = 0; idx < wbc_range.count; idx++) {
335 wbctotal += wbc_range.extents[idx].length;
336 }
337 kprintf("kern_direct_file(%s): wbc %qd\n", ref->name, wbctotal);
338 if (wbctotal) {
339 target = wbc_range.dev;
340 }
341 }
342
343 if (set_file_size) {
344 if (wbctotal) {
345 if (wbctotal >= set_file_size) {
346 set_file_size = HIBERNATE_MIN_FILE_SIZE;
347 } else {
348 set_file_size -= wbctotal;
349 if (set_file_size < HIBERNATE_MIN_FILE_SIZE) {
350 set_file_size = HIBERNATE_MIN_FILE_SIZE;
351 }
352 }
353 }
354 if (fs_free_size) {
355 mpFree += va.va_data_alloc;
356 if ((mpFree < set_file_size) || ((mpFree - set_file_size) < fs_free_size)) {
357 error = ENOSPC;
358 goto out;
359 }
360 }
361 error = vnode_setsize(ref->vp, set_file_size, IO_NOZEROFILL | IO_NOAUTH, ref->ctx);
362 if (error) {
363 goto out;
364 }
365 ref->filelength = set_file_size;
366 }
367 } else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR)) {
368 /* Partition. */
369 device = va.va_rdev;
370
371 p1 = ref->vp;
372 p2 = ref->ctx;
373 do_ioctl = &device_ioctl;
374 } else {
375 /* Don't dump to non-regular files. */
376 error = EFAULT;
377 goto out;
378 }
379 ref->device = device;
380
381 // probe for CF
382 dk_corestorage_info_t cs_info;
383 memset(&cs_info, 0, sizeof(dk_corestorage_info_t));
384 error = do_ioctl(p1, p2, DKIOCCORESTORAGE, (caddr_t)&cs_info);
385 ref->cf = (error == 0) && (cs_info.flags & DK_CORESTORAGE_ENABLE_HOTFILES);
386
387 // get block size
388
389 error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &ref->blksize);
390 if (error) {
391 goto out;
392 }
393
394 if (ref->blksize == 4096) {
395 minoffset = HIBERNATE_MIN_PHYSICAL_LBA_4096 * ref->blksize;
396 } else {
397 minoffset = HIBERNATE_MIN_PHYSICAL_LBA_512 * ref->blksize;
398 }
399
400 if (ref->vp->v_type != VREG) {
401 error = do_ioctl(p1, p2, DKIOCGETBLOCKCOUNT, (caddr_t) &fileblk);
402 if (error) {
403 goto out;
404 }
405 ref->filelength = fileblk * ref->blksize;
406 }
407
408 // pin logical extents, CS version
409
410 error = kern_ioctl_file_extents(ref, _DKIOCCSPINEXTENT, 0, ref->filelength);
411 if (error && (ENOTTY != error)) {
412 goto out;
413 }
414 ref->pinned = (error == 0);
415
416 // pin logical extents, apfs version
417
418 error = VNOP_IOCTL(ref->vp, FSCTL_FREEZE_EXTENTS, NULL, 0, ref->ctx);
419 if (error && (ENOTTY != error)) {
420 goto out;
421 }
422 ref->frozen = (error == 0);
423
424 // generate the block list
425
426 error = do_ioctl(p1, p2, DKIOCLOCKPHYSICALEXTENTS, NULL);
427 if (error) {
428 goto out;
429 }
430 locked = TRUE;
431
432 f_offset = 0;
433 for (; f_offset < ref->filelength; f_offset += filechunk) {
434 if (ref->vp->v_type == VREG) {
435 filechunk = 1 * 1024 * 1024 * 1024;
436 daddr64_t blkno;
437
438 error = VNOP_BLOCKMAP(ref->vp, f_offset, filechunk, &blkno,
439 &filechunk, NULL, VNODE_WRITE | VNODE_BLOCKMAP_NO_TRACK, NULL);
440 if (error) {
441 goto out;
442 }
443 if (-1LL == blkno) {
444 continue;
445 }
446 fileblk = blkno * ref->blksize;
447 } else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR)) {
448 fileblk = f_offset;
449 filechunk = f_offset ? 0 : (unsigned long)ref->filelength;
450 }
451
452 physoffset = 0;
453 while (physoffset < filechunk) {
454 dk_physical_extent_t getphysreq;
455 bzero(&getphysreq, sizeof(getphysreq));
456
457 getphysreq.offset = fileblk + physoffset;
458 getphysreq.length = (filechunk - physoffset);
459 error = do_ioctl(p1, p2, DKIOCGETPHYSICALEXTENT, (caddr_t) &getphysreq);
460 if (error) {
461 goto out;
462 }
463 if (!target) {
464 target = getphysreq.dev;
465 } else if (target != getphysreq.dev) {
466 error = ENOTSUP;
467 goto out;
468 }
469
470 assert(getphysreq.offset >= minoffset);
471
472 #if HIBFRAGMENT
473 uint64_t rev;
474 for (rev = 4096; rev <= getphysreq.length; rev += 4096) {
475 callback(callback_ref, getphysreq.offset + getphysreq.length - rev, 4096);
476 }
477 #else
478 callback(callback_ref, getphysreq.offset, getphysreq.length);
479 #endif
480 physoffset += getphysreq.length;
481 }
482 }
483 if (ref->wbcranged) {
484 uint32_t idx;
485 for (idx = 0; idx < wbc_range.count; idx++) {
486 assert(wbc_range.extents[idx].offset >= minoffset);
487 callback(callback_ref, wbc_range.extents[idx].offset, wbc_range.extents[idx].length);
488 }
489 }
490 callback(callback_ref, 0ULL, 0ULL);
491
492 if (ref->vp->v_type == VREG) {
493 p1 = ⌖
494 } else {
495 p1 = ⌖
496 p2 = p;
497 do_ioctl = &file_ioctl;
498 }
499
500 // get partition base
501
502 if (partitionbase_result) {
503 error = do_ioctl(p1, p2, DKIOCGETBASE, (caddr_t) partitionbase_result);
504 if (error) {
505 goto out;
506 }
507 }
508
509 // get block size & constraints
510
511 error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &blksize);
512 if (error) {
513 goto out;
514 }
515
516 maxiocount = 1 * 1024 * 1024 * 1024;
517
518 error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t) &count);
519 if (error) {
520 count = 0;
521 }
522 count *= blksize;
523 if (count && (count < maxiocount)) {
524 maxiocount = count;
525 }
526
527 error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTWRITE, (caddr_t) &count);
528 if (error) {
529 count = 0;
530 }
531 count *= blksize;
532 if (count && (count < maxiocount)) {
533 maxiocount = count;
534 }
535
536 error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTREAD, (caddr_t) &count);
537 if (error) {
538 count = 0;
539 }
540 if (count && (count < maxiocount)) {
541 maxiocount = count;
542 }
543
544 error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTWRITE, (caddr_t) &count);
545 if (error) {
546 count = 0;
547 }
548 if (count && (count < maxiocount)) {
549 maxiocount = count;
550 }
551
552 error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTREAD, (caddr_t) &count);
553 if (!error) {
554 error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTCOUNTREAD, (caddr_t) &segcount);
555 }
556 if (error) {
557 count = segcount = 0;
558 }
559 count *= segcount;
560 if (count && (count < maxiocount)) {
561 maxiocount = count;
562 }
563
564 error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTWRITE, (caddr_t) &count);
565 if (!error) {
566 error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTCOUNTWRITE, (caddr_t) &segcount);
567 }
568 if (error) {
569 count = segcount = 0;
570 }
571 count *= segcount;
572 if (count && (count < maxiocount)) {
573 maxiocount = count;
574 }
575
576 kprintf("max io 0x%qx bytes\n", maxiocount);
577 if (maxiocount_result) {
578 *maxiocount_result = maxiocount;
579 }
580
581 error = do_ioctl(p1, p2, DKIOCISSOLIDSTATE, (caddr_t)&isssd);
582 if (!error && isssd) {
583 flags |= kIOPolledFileSSD;
584 }
585
586 if (partition_device_result) {
587 *partition_device_result = device;
588 }
589 if (image_device_result) {
590 *image_device_result = target;
591 }
592 if (oflags) {
593 *oflags = flags;
594 }
595
596 if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR)) {
597 vnode_close(ref->vp, FWRITE, ref->ctx);
598 ref->vp = NULLVP;
599 ref->ctx = NULL;
600 }
601
602 out:
603 printf("kern_open_file_for_direct_io(%p, %d)\n", ref, error);
604
605
606 if (error && locked) {
607 p1 = &device;
608 if (do_ioctl) {
609 (void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
610 }
611 }
612
613 if (error && ref) {
614 if (ref->vp) {
615 (void) kern_ioctl_file_extents(ref, _DKIOCCSUNPINEXTENT, 0, (ref->pinned && ref->cf) ? ref->filelength : 0);
616
617 if (ref->frozen) {
618 (void) VNOP_IOCTL(ref->vp, FSCTL_THAW_EXTENTS, NULL, 0, ref->ctx);
619 }
620 if (ref->wbcranged) {
621 if (do_ioctl) {
622 (void) do_ioctl(p1, p2, DKIOCAPFSRELEASEWBCRANGE, (caddr_t) NULL);
623 }
624 }
625 vnode_close(ref->vp, FWRITE, ref->ctx);
626 ref->vp = NULLVP;
627 }
628 ref->ctx = NULL;
629 if (ref->name) {
630 kfree_data(ref->name, ref->namesize);
631 ref->name = NULL;
632 }
633 kfree_type(struct kern_direct_file_io_ref_t, ref);
634 ref = NULL;
635 }
636
637 return ref;
638 }
639
640 int
kern_write_file(struct kern_direct_file_io_ref_t * ref,off_t offset,void * addr,size_t len,int ioflag)641 kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, void * addr, size_t len, int ioflag)
642 {
643 assert(len <= INT32_MAX);
644 return vn_rdwr(UIO_WRITE, ref->vp,
645 addr, (int)len, offset,
646 UIO_SYSSPACE, ioflag | IO_SYNC | IO_NODELOCKED | IO_UNIT,
647 vfs_context_ucred(ref->ctx), (int *) 0,
648 vfs_context_proc(ref->ctx));
649 }
650
651 int
kern_read_file(struct kern_direct_file_io_ref_t * ref,off_t offset,void * addr,size_t len,int ioflag)652 kern_read_file(struct kern_direct_file_io_ref_t * ref, off_t offset, void * addr, size_t len, int ioflag)
653 {
654 assert(len <= INT32_MAX);
655 return vn_rdwr(UIO_READ, ref->vp,
656 addr, (int)len, offset,
657 UIO_SYSSPACE, ioflag | IO_SYNC | IO_NODELOCKED | IO_UNIT,
658 vfs_context_ucred(ref->ctx), (int *) 0,
659 vfs_context_proc(ref->ctx));
660 }
661
662
663 struct mount *
kern_file_mount(struct kern_direct_file_io_ref_t * ref)664 kern_file_mount(struct kern_direct_file_io_ref_t * ref)
665 {
666 return ref->vp->v_mount;
667 }
668
669 void
kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref,off_t write_offset,void * addr,size_t write_length,off_t discard_offset,off_t discard_end,bool unlink)670 kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref,
671 off_t write_offset, void * addr, size_t write_length,
672 off_t discard_offset, off_t discard_end, bool unlink)
673 {
674 int error;
675 printf("kern_close_file_for_direct_io(%p)\n", ref);
676
677 if (!ref) {
678 return;
679 }
680
681 if (ref->vp) {
682 int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
683 void * p1;
684 void * p2;
685
686 discard_offset = ((discard_offset + ref->blksize - 1) & ~(((off_t) ref->blksize) - 1));
687 discard_end = ((discard_end) & ~(((off_t) ref->blksize) - 1));
688
689 if (ref->vp->v_type == VREG) {
690 p1 = &ref->device;
691 p2 = kernproc;
692 do_ioctl = &file_ioctl;
693 } else {
694 /* Partition. */
695 p1 = ref->vp;
696 p2 = ref->ctx;
697 do_ioctl = &device_ioctl;
698 }
699 (void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
700
701 //XXX If unmapping extents then don't also need to unpin; except ...
702 //XXX if file unaligned (HFS 4k / Fusion 128k) then pin is superset and
703 //XXX unmap is subset, so save extra walk over file extents (and the risk
704 //XXX that CF drain starts) vs leaving partial units pinned to SSD
705 //XXX (until whatever was sharing also unmaps). Err on cleaning up fully.
706 boolean_t will_unmap = (!ref->pinned || ref->cf) && (discard_end > discard_offset);
707 boolean_t will_unpin = (ref->pinned && ref->cf /* && !will_unmap */);
708
709 (void) kern_ioctl_file_extents(ref, _DKIOCCSUNPINEXTENT, 0, (will_unpin) ? ref->filelength : 0);
710
711 if (will_unmap) {
712 (void) kern_ioctl_file_extents(ref, DKIOCUNMAP, discard_offset, (ref->cf) ? ref->filelength : discard_end);
713 }
714
715 if (ref->frozen) {
716 (void) VNOP_IOCTL(ref->vp, FSCTL_THAW_EXTENTS, NULL, 0, ref->ctx);
717 }
718 if (ref->wbcranged) {
719 (void) do_ioctl(p1, p2, DKIOCAPFSRELEASEWBCRANGE, (caddr_t) NULL);
720 }
721
722 if (addr && write_length) {
723 (void) kern_write_file(ref, write_offset, addr, write_length, IO_SKIP_ENCRYPTION);
724 }
725
726 error = vnode_close(ref->vp, FWRITE, ref->ctx);
727
728 ref->vp = NULLVP;
729 kprintf("vnode_close(%d)\n", error);
730
731
732 if (unlink) {
733 int unlink1(vfs_context_t, vnode_t, user_addr_t, enum uio_seg, int);
734
735 error = unlink1(ref->ctx, NULLVP, CAST_USER_ADDR_T(ref->name), UIO_SYSSPACE, 0);
736 kprintf("%s: unlink1(%d)\n", __func__, error);
737 }
738 }
739
740 ref->ctx = NULL;
741
742 kfree_data(ref->name, ref->namesize);
743 ref->name = NULL;
744
745 kfree_type(struct kern_direct_file_io_ref_t, ref);
746 }
747