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raw-posix: Fix build without posix_fallocate()
[mirror_qemu.git] / block / raw-posix.c
1 /*
2 * Block driver for RAW files (posix)
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu-common.h"
25 #include "qemu/timer.h"
26 #include "qemu/log.h"
27 #include "block/block_int.h"
28 #include "qemu/module.h"
29 #include "trace.h"
30 #include "block/thread-pool.h"
31 #include "qemu/iov.h"
32 #include "raw-aio.h"
33 #include "qapi/util.h"
34
35 #if defined(__APPLE__) && (__MACH__)
36 #include <paths.h>
37 #include <sys/param.h>
38 #include <IOKit/IOKitLib.h>
39 #include <IOKit/IOBSD.h>
40 #include <IOKit/storage/IOMediaBSDClient.h>
41 #include <IOKit/storage/IOMedia.h>
42 #include <IOKit/storage/IOCDMedia.h>
43 //#include <IOKit/storage/IOCDTypes.h>
44 #include <CoreFoundation/CoreFoundation.h>
45 #endif
46
47 #ifdef __sun__
48 #define _POSIX_PTHREAD_SEMANTICS 1
49 #include <sys/dkio.h>
50 #endif
51 #ifdef __linux__
52 #include <sys/types.h>
53 #include <sys/stat.h>
54 #include <sys/ioctl.h>
55 #include <sys/param.h>
56 #include <linux/cdrom.h>
57 #include <linux/fd.h>
58 #include <linux/fs.h>
59 #ifndef FS_NOCOW_FL
60 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
61 #endif
62 #endif
63 #ifdef CONFIG_FIEMAP
64 #include <linux/fiemap.h>
65 #endif
66 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
67 #include <linux/falloc.h>
68 #endif
69 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
70 #include <sys/disk.h>
71 #include <sys/cdio.h>
72 #endif
73
74 #ifdef __OpenBSD__
75 #include <sys/ioctl.h>
76 #include <sys/disklabel.h>
77 #include <sys/dkio.h>
78 #endif
79
80 #ifdef __NetBSD__
81 #include <sys/ioctl.h>
82 #include <sys/disklabel.h>
83 #include <sys/dkio.h>
84 #include <sys/disk.h>
85 #endif
86
87 #ifdef __DragonFly__
88 #include <sys/ioctl.h>
89 #include <sys/diskslice.h>
90 #endif
91
92 #ifdef CONFIG_XFS
93 #include <xfs/xfs.h>
94 #endif
95
96 //#define DEBUG_FLOPPY
97
98 //#define DEBUG_BLOCK
99 #if defined(DEBUG_BLOCK)
100 #define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
101 { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
102 #else
103 #define DEBUG_BLOCK_PRINT(formatCstr, ...)
104 #endif
105
106 /* OS X does not have O_DSYNC */
107 #ifndef O_DSYNC
108 #ifdef O_SYNC
109 #define O_DSYNC O_SYNC
110 #elif defined(O_FSYNC)
111 #define O_DSYNC O_FSYNC
112 #endif
113 #endif
114
115 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
116 #ifndef O_DIRECT
117 #define O_DIRECT O_DSYNC
118 #endif
119
120 #define FTYPE_FILE 0
121 #define FTYPE_CD 1
122 #define FTYPE_FD 2
123
124 /* if the FD is not accessed during that time (in ns), we try to
125 reopen it to see if the disk has been changed */
126 #define FD_OPEN_TIMEOUT (1000000000)
127
128 #define MAX_BLOCKSIZE 4096
129
130 typedef struct BDRVRawState {
131 int fd;
132 int type;
133 int open_flags;
134 size_t buf_align;
135
136 #if defined(__linux__)
137 /* linux floppy specific */
138 int64_t fd_open_time;
139 int64_t fd_error_time;
140 int fd_got_error;
141 int fd_media_changed;
142 #endif
143 #ifdef CONFIG_LINUX_AIO
144 int use_aio;
145 void *aio_ctx;
146 #endif
147 #ifdef CONFIG_XFS
148 bool is_xfs:1;
149 #endif
150 bool has_discard:1;
151 bool has_write_zeroes:1;
152 bool discard_zeroes:1;
153 #ifdef CONFIG_FIEMAP
154 bool skip_fiemap;
155 #endif
156 } BDRVRawState;
157
158 typedef struct BDRVRawReopenState {
159 int fd;
160 int open_flags;
161 #ifdef CONFIG_LINUX_AIO
162 int use_aio;
163 #endif
164 } BDRVRawReopenState;
165
166 static int fd_open(BlockDriverState *bs);
167 static int64_t raw_getlength(BlockDriverState *bs);
168
169 typedef struct RawPosixAIOData {
170 BlockDriverState *bs;
171 int aio_fildes;
172 union {
173 struct iovec *aio_iov;
174 void *aio_ioctl_buf;
175 };
176 int aio_niov;
177 uint64_t aio_nbytes;
178 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
179 off_t aio_offset;
180 int aio_type;
181 } RawPosixAIOData;
182
183 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
184 static int cdrom_reopen(BlockDriverState *bs);
185 #endif
186
187 #if defined(__NetBSD__)
188 static int raw_normalize_devicepath(const char **filename)
189 {
190 static char namebuf[PATH_MAX];
191 const char *dp, *fname;
192 struct stat sb;
193
194 fname = *filename;
195 dp = strrchr(fname, '/');
196 if (lstat(fname, &sb) < 0) {
197 fprintf(stderr, "%s: stat failed: %s\n",
198 fname, strerror(errno));
199 return -errno;
200 }
201
202 if (!S_ISBLK(sb.st_mode)) {
203 return 0;
204 }
205
206 if (dp == NULL) {
207 snprintf(namebuf, PATH_MAX, "r%s", fname);
208 } else {
209 snprintf(namebuf, PATH_MAX, "%.*s/r%s",
210 (int)(dp - fname), fname, dp + 1);
211 }
212 fprintf(stderr, "%s is a block device", fname);
213 *filename = namebuf;
214 fprintf(stderr, ", using %s\n", *filename);
215
216 return 0;
217 }
218 #else
219 static int raw_normalize_devicepath(const char **filename)
220 {
221 return 0;
222 }
223 #endif
224
225 static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
226 {
227 BDRVRawState *s = bs->opaque;
228 char *buf;
229 unsigned int sector_size;
230
231 /* For /dev/sg devices the alignment is not really used.
232 With buffered I/O, we don't have any restrictions. */
233 if (bs->sg || !(s->open_flags & O_DIRECT)) {
234 bs->request_alignment = 1;
235 s->buf_align = 1;
236 return;
237 }
238
239 /* Try a few ioctls to get the right size */
240 bs->request_alignment = 0;
241 s->buf_align = 0;
242
243 #ifdef BLKSSZGET
244 if (ioctl(fd, BLKSSZGET, &sector_size) >= 0) {
245 bs->request_alignment = sector_size;
246 }
247 #endif
248 #ifdef DKIOCGETBLOCKSIZE
249 if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) >= 0) {
250 bs->request_alignment = sector_size;
251 }
252 #endif
253 #ifdef DIOCGSECTORSIZE
254 if (ioctl(fd, DIOCGSECTORSIZE, &sector_size) >= 0) {
255 bs->request_alignment = sector_size;
256 }
257 #endif
258 #ifdef CONFIG_XFS
259 if (s->is_xfs) {
260 struct dioattr da;
261 if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
262 bs->request_alignment = da.d_miniosz;
263 /* The kernel returns wrong information for d_mem */
264 /* s->buf_align = da.d_mem; */
265 }
266 }
267 #endif
268
269 /* If we could not get the sizes so far, we can only guess them */
270 if (!s->buf_align) {
271 size_t align;
272 buf = qemu_memalign(MAX_BLOCKSIZE, 2 * MAX_BLOCKSIZE);
273 for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) {
274 if (pread(fd, buf + align, MAX_BLOCKSIZE, 0) >= 0) {
275 s->buf_align = align;
276 break;
277 }
278 }
279 qemu_vfree(buf);
280 }
281
282 if (!bs->request_alignment) {
283 size_t align;
284 buf = qemu_memalign(s->buf_align, MAX_BLOCKSIZE);
285 for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) {
286 if (pread(fd, buf, align, 0) >= 0) {
287 bs->request_alignment = align;
288 break;
289 }
290 }
291 qemu_vfree(buf);
292 }
293
294 if (!s->buf_align || !bs->request_alignment) {
295 error_setg(errp, "Could not find working O_DIRECT alignment. "
296 "Try cache.direct=off.");
297 }
298 }
299
300 static void raw_parse_flags(int bdrv_flags, int *open_flags)
301 {
302 assert(open_flags != NULL);
303
304 *open_flags |= O_BINARY;
305 *open_flags &= ~O_ACCMODE;
306 if (bdrv_flags & BDRV_O_RDWR) {
307 *open_flags |= O_RDWR;
308 } else {
309 *open_flags |= O_RDONLY;
310 }
311
312 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
313 * and O_DIRECT for no caching. */
314 if ((bdrv_flags & BDRV_O_NOCACHE)) {
315 *open_flags |= O_DIRECT;
316 }
317 }
318
319 static void raw_detach_aio_context(BlockDriverState *bs)
320 {
321 #ifdef CONFIG_LINUX_AIO
322 BDRVRawState *s = bs->opaque;
323
324 if (s->use_aio) {
325 laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs));
326 }
327 #endif
328 }
329
330 static void raw_attach_aio_context(BlockDriverState *bs,
331 AioContext *new_context)
332 {
333 #ifdef CONFIG_LINUX_AIO
334 BDRVRawState *s = bs->opaque;
335
336 if (s->use_aio) {
337 laio_attach_aio_context(s->aio_ctx, new_context);
338 }
339 #endif
340 }
341
342 #ifdef CONFIG_LINUX_AIO
343 static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
344 {
345 int ret = -1;
346 assert(aio_ctx != NULL);
347 assert(use_aio != NULL);
348 /*
349 * Currently Linux do AIO only for files opened with O_DIRECT
350 * specified so check NOCACHE flag too
351 */
352 if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
353 (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
354
355 /* if non-NULL, laio_init() has already been run */
356 if (*aio_ctx == NULL) {
357 *aio_ctx = laio_init();
358 if (!*aio_ctx) {
359 goto error;
360 }
361 }
362 *use_aio = 1;
363 } else {
364 *use_aio = 0;
365 }
366
367 ret = 0;
368
369 error:
370 return ret;
371 }
372 #endif
373
374 static void raw_parse_filename(const char *filename, QDict *options,
375 Error **errp)
376 {
377 /* The filename does not have to be prefixed by the protocol name, since
378 * "file" is the default protocol; therefore, the return value of this
379 * function call can be ignored. */
380 strstart(filename, "file:", &filename);
381
382 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
383 }
384
385 static QemuOptsList raw_runtime_opts = {
386 .name = "raw",
387 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
388 .desc = {
389 {
390 .name = "filename",
391 .type = QEMU_OPT_STRING,
392 .help = "File name of the image",
393 },
394 { /* end of list */ }
395 },
396 };
397
398 static int raw_open_common(BlockDriverState *bs, QDict *options,
399 int bdrv_flags, int open_flags, Error **errp)
400 {
401 BDRVRawState *s = bs->opaque;
402 QemuOpts *opts;
403 Error *local_err = NULL;
404 const char *filename = NULL;
405 int fd, ret;
406 struct stat st;
407
408 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
409 qemu_opts_absorb_qdict(opts, options, &local_err);
410 if (local_err) {
411 error_propagate(errp, local_err);
412 ret = -EINVAL;
413 goto fail;
414 }
415
416 filename = qemu_opt_get(opts, "filename");
417
418 ret = raw_normalize_devicepath(&filename);
419 if (ret != 0) {
420 error_setg_errno(errp, -ret, "Could not normalize device path");
421 goto fail;
422 }
423
424 s->open_flags = open_flags;
425 raw_parse_flags(bdrv_flags, &s->open_flags);
426
427 s->fd = -1;
428 fd = qemu_open(filename, s->open_flags, 0644);
429 if (fd < 0) {
430 ret = -errno;
431 if (ret == -EROFS) {
432 ret = -EACCES;
433 }
434 goto fail;
435 }
436 s->fd = fd;
437
438 #ifdef CONFIG_LINUX_AIO
439 if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
440 qemu_close(fd);
441 ret = -errno;
442 error_setg_errno(errp, -ret, "Could not set AIO state");
443 goto fail;
444 }
445 #endif
446
447 s->has_discard = true;
448 s->has_write_zeroes = true;
449
450 if (fstat(s->fd, &st) < 0) {
451 error_setg_errno(errp, errno, "Could not stat file");
452 goto fail;
453 }
454 if (S_ISREG(st.st_mode)) {
455 s->discard_zeroes = true;
456 }
457 if (S_ISBLK(st.st_mode)) {
458 #ifdef BLKDISCARDZEROES
459 unsigned int arg;
460 if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
461 s->discard_zeroes = true;
462 }
463 #endif
464 #ifdef __linux__
465 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
466 * not rely on the contents of discarded blocks unless using O_DIRECT.
467 * Same for BLKZEROOUT.
468 */
469 if (!(bs->open_flags & BDRV_O_NOCACHE)) {
470 s->discard_zeroes = false;
471 s->has_write_zeroes = false;
472 }
473 #endif
474 }
475
476 #ifdef CONFIG_XFS
477 if (platform_test_xfs_fd(s->fd)) {
478 s->is_xfs = true;
479 }
480 #endif
481
482 raw_attach_aio_context(bs, bdrv_get_aio_context(bs));
483
484 ret = 0;
485 fail:
486 if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
487 unlink(filename);
488 }
489 qemu_opts_del(opts);
490 return ret;
491 }
492
493 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
494 Error **errp)
495 {
496 BDRVRawState *s = bs->opaque;
497 Error *local_err = NULL;
498 int ret;
499
500 s->type = FTYPE_FILE;
501 ret = raw_open_common(bs, options, flags, 0, &local_err);
502 if (local_err) {
503 error_propagate(errp, local_err);
504 }
505 return ret;
506 }
507
508 static int raw_reopen_prepare(BDRVReopenState *state,
509 BlockReopenQueue *queue, Error **errp)
510 {
511 BDRVRawState *s;
512 BDRVRawReopenState *raw_s;
513 int ret = 0;
514 Error *local_err = NULL;
515
516 assert(state != NULL);
517 assert(state->bs != NULL);
518
519 s = state->bs->opaque;
520
521 state->opaque = g_new0(BDRVRawReopenState, 1);
522 raw_s = state->opaque;
523
524 #ifdef CONFIG_LINUX_AIO
525 raw_s->use_aio = s->use_aio;
526
527 /* we can use s->aio_ctx instead of a copy, because the use_aio flag is
528 * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
529 * won't override aio_ctx if aio_ctx is non-NULL */
530 if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) {
531 error_setg(errp, "Could not set AIO state");
532 return -1;
533 }
534 #endif
535
536 if (s->type == FTYPE_FD || s->type == FTYPE_CD) {
537 raw_s->open_flags |= O_NONBLOCK;
538 }
539
540 raw_parse_flags(state->flags, &raw_s->open_flags);
541
542 raw_s->fd = -1;
543
544 int fcntl_flags = O_APPEND | O_NONBLOCK;
545 #ifdef O_NOATIME
546 fcntl_flags |= O_NOATIME;
547 #endif
548
549 #ifdef O_ASYNC
550 /* Not all operating systems have O_ASYNC, and those that don't
551 * will not let us track the state into raw_s->open_flags (typically
552 * you achieve the same effect with an ioctl, for example I_SETSIG
553 * on Solaris). But we do not use O_ASYNC, so that's fine.
554 */
555 assert((s->open_flags & O_ASYNC) == 0);
556 #endif
557
558 if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
559 /* dup the original fd */
560 /* TODO: use qemu fcntl wrapper */
561 #ifdef F_DUPFD_CLOEXEC
562 raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0);
563 #else
564 raw_s->fd = dup(s->fd);
565 if (raw_s->fd != -1) {
566 qemu_set_cloexec(raw_s->fd);
567 }
568 #endif
569 if (raw_s->fd >= 0) {
570 ret = fcntl_setfl(raw_s->fd, raw_s->open_flags);
571 if (ret) {
572 qemu_close(raw_s->fd);
573 raw_s->fd = -1;
574 }
575 }
576 }
577
578 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
579 if (raw_s->fd == -1) {
580 assert(!(raw_s->open_flags & O_CREAT));
581 raw_s->fd = qemu_open(state->bs->filename, raw_s->open_flags);
582 if (raw_s->fd == -1) {
583 error_setg_errno(errp, errno, "Could not reopen file");
584 ret = -1;
585 }
586 }
587
588 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
589 * alignment with the new fd. */
590 if (raw_s->fd != -1) {
591 raw_probe_alignment(state->bs, raw_s->fd, &local_err);
592 if (local_err) {
593 qemu_close(raw_s->fd);
594 raw_s->fd = -1;
595 error_propagate(errp, local_err);
596 ret = -EINVAL;
597 }
598 }
599
600 return ret;
601 }
602
603 static void raw_reopen_commit(BDRVReopenState *state)
604 {
605 BDRVRawReopenState *raw_s = state->opaque;
606 BDRVRawState *s = state->bs->opaque;
607
608 s->open_flags = raw_s->open_flags;
609
610 qemu_close(s->fd);
611 s->fd = raw_s->fd;
612 #ifdef CONFIG_LINUX_AIO
613 s->use_aio = raw_s->use_aio;
614 #endif
615
616 g_free(state->opaque);
617 state->opaque = NULL;
618 }
619
620
621 static void raw_reopen_abort(BDRVReopenState *state)
622 {
623 BDRVRawReopenState *raw_s = state->opaque;
624
625 /* nothing to do if NULL, we didn't get far enough */
626 if (raw_s == NULL) {
627 return;
628 }
629
630 if (raw_s->fd >= 0) {
631 qemu_close(raw_s->fd);
632 raw_s->fd = -1;
633 }
634 g_free(state->opaque);
635 state->opaque = NULL;
636 }
637
638 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
639 {
640 BDRVRawState *s = bs->opaque;
641
642 raw_probe_alignment(bs, s->fd, errp);
643 bs->bl.opt_mem_alignment = s->buf_align;
644 }
645
646 static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
647 {
648 int ret;
649
650 ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
651 if (ret == -1) {
652 return -errno;
653 }
654
655 return 0;
656 }
657
658 static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
659 {
660 int ret;
661
662 ret = qemu_fdatasync(aiocb->aio_fildes);
663 if (ret == -1) {
664 return -errno;
665 }
666 return 0;
667 }
668
669 #ifdef CONFIG_PREADV
670
671 static bool preadv_present = true;
672
673 static ssize_t
674 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
675 {
676 return preadv(fd, iov, nr_iov, offset);
677 }
678
679 static ssize_t
680 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
681 {
682 return pwritev(fd, iov, nr_iov, offset);
683 }
684
685 #else
686
687 static bool preadv_present = false;
688
689 static ssize_t
690 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
691 {
692 return -ENOSYS;
693 }
694
695 static ssize_t
696 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
697 {
698 return -ENOSYS;
699 }
700
701 #endif
702
703 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
704 {
705 ssize_t len;
706
707 do {
708 if (aiocb->aio_type & QEMU_AIO_WRITE)
709 len = qemu_pwritev(aiocb->aio_fildes,
710 aiocb->aio_iov,
711 aiocb->aio_niov,
712 aiocb->aio_offset);
713 else
714 len = qemu_preadv(aiocb->aio_fildes,
715 aiocb->aio_iov,
716 aiocb->aio_niov,
717 aiocb->aio_offset);
718 } while (len == -1 && errno == EINTR);
719
720 if (len == -1) {
721 return -errno;
722 }
723 return len;
724 }
725
726 /*
727 * Read/writes the data to/from a given linear buffer.
728 *
729 * Returns the number of bytes handles or -errno in case of an error. Short
730 * reads are only returned if the end of the file is reached.
731 */
732 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
733 {
734 ssize_t offset = 0;
735 ssize_t len;
736
737 while (offset < aiocb->aio_nbytes) {
738 if (aiocb->aio_type & QEMU_AIO_WRITE) {
739 len = pwrite(aiocb->aio_fildes,
740 (const char *)buf + offset,
741 aiocb->aio_nbytes - offset,
742 aiocb->aio_offset + offset);
743 } else {
744 len = pread(aiocb->aio_fildes,
745 buf + offset,
746 aiocb->aio_nbytes - offset,
747 aiocb->aio_offset + offset);
748 }
749 if (len == -1 && errno == EINTR) {
750 continue;
751 } else if (len == -1 && errno == EINVAL &&
752 (aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
753 !(aiocb->aio_type & QEMU_AIO_WRITE) &&
754 offset > 0) {
755 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
756 * after a short read. Assume that O_DIRECT short reads only occur
757 * at EOF. Therefore this is a short read, not an I/O error.
758 */
759 break;
760 } else if (len == -1) {
761 offset = -errno;
762 break;
763 } else if (len == 0) {
764 break;
765 }
766 offset += len;
767 }
768
769 return offset;
770 }
771
772 static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
773 {
774 ssize_t nbytes;
775 char *buf;
776
777 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
778 /*
779 * If there is just a single buffer, and it is properly aligned
780 * we can just use plain pread/pwrite without any problems.
781 */
782 if (aiocb->aio_niov == 1) {
783 return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
784 }
785 /*
786 * We have more than one iovec, and all are properly aligned.
787 *
788 * Try preadv/pwritev first and fall back to linearizing the
789 * buffer if it's not supported.
790 */
791 if (preadv_present) {
792 nbytes = handle_aiocb_rw_vector(aiocb);
793 if (nbytes == aiocb->aio_nbytes ||
794 (nbytes < 0 && nbytes != -ENOSYS)) {
795 return nbytes;
796 }
797 preadv_present = false;
798 }
799
800 /*
801 * XXX(hch): short read/write. no easy way to handle the reminder
802 * using these interfaces. For now retry using plain
803 * pread/pwrite?
804 */
805 }
806
807 /*
808 * Ok, we have to do it the hard way, copy all segments into
809 * a single aligned buffer.
810 */
811 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
812 if (buf == NULL) {
813 return -ENOMEM;
814 }
815
816 if (aiocb->aio_type & QEMU_AIO_WRITE) {
817 char *p = buf;
818 int i;
819
820 for (i = 0; i < aiocb->aio_niov; ++i) {
821 memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
822 p += aiocb->aio_iov[i].iov_len;
823 }
824 assert(p - buf == aiocb->aio_nbytes);
825 }
826
827 nbytes = handle_aiocb_rw_linear(aiocb, buf);
828 if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
829 char *p = buf;
830 size_t count = aiocb->aio_nbytes, copy;
831 int i;
832
833 for (i = 0; i < aiocb->aio_niov && count; ++i) {
834 copy = count;
835 if (copy > aiocb->aio_iov[i].iov_len) {
836 copy = aiocb->aio_iov[i].iov_len;
837 }
838 memcpy(aiocb->aio_iov[i].iov_base, p, copy);
839 assert(count >= copy);
840 p += copy;
841 count -= copy;
842 }
843 assert(count == 0);
844 }
845 qemu_vfree(buf);
846
847 return nbytes;
848 }
849
850 #ifdef CONFIG_XFS
851 static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
852 {
853 struct xfs_flock64 fl;
854
855 memset(&fl, 0, sizeof(fl));
856 fl.l_whence = SEEK_SET;
857 fl.l_start = offset;
858 fl.l_len = bytes;
859
860 if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
861 DEBUG_BLOCK_PRINT("cannot write zero range (%s)\n", strerror(errno));
862 return -errno;
863 }
864
865 return 0;
866 }
867
868 static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
869 {
870 struct xfs_flock64 fl;
871
872 memset(&fl, 0, sizeof(fl));
873 fl.l_whence = SEEK_SET;
874 fl.l_start = offset;
875 fl.l_len = bytes;
876
877 if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
878 DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno));
879 return -errno;
880 }
881
882 return 0;
883 }
884 #endif
885
886 static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
887 {
888 int ret = -EOPNOTSUPP;
889 BDRVRawState *s = aiocb->bs->opaque;
890
891 if (s->has_write_zeroes == 0) {
892 return -ENOTSUP;
893 }
894
895 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
896 #ifdef BLKZEROOUT
897 do {
898 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
899 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) {
900 return 0;
901 }
902 } while (errno == EINTR);
903
904 ret = -errno;
905 #endif
906 } else {
907 #ifdef CONFIG_XFS
908 if (s->is_xfs) {
909 return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
910 }
911 #endif
912 }
913
914 if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
915 ret == -ENOTTY) {
916 s->has_write_zeroes = false;
917 ret = -ENOTSUP;
918 }
919 return ret;
920 }
921
922 static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
923 {
924 int ret = -EOPNOTSUPP;
925 BDRVRawState *s = aiocb->bs->opaque;
926
927 if (!s->has_discard) {
928 return -ENOTSUP;
929 }
930
931 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
932 #ifdef BLKDISCARD
933 do {
934 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
935 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
936 return 0;
937 }
938 } while (errno == EINTR);
939
940 ret = -errno;
941 #endif
942 } else {
943 #ifdef CONFIG_XFS
944 if (s->is_xfs) {
945 return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
946 }
947 #endif
948
949 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
950 do {
951 if (fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
952 aiocb->aio_offset, aiocb->aio_nbytes) == 0) {
953 return 0;
954 }
955 } while (errno == EINTR);
956
957 ret = -errno;
958 #endif
959 }
960
961 if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
962 ret == -ENOTTY) {
963 s->has_discard = false;
964 ret = -ENOTSUP;
965 }
966 return ret;
967 }
968
969 static int aio_worker(void *arg)
970 {
971 RawPosixAIOData *aiocb = arg;
972 ssize_t ret = 0;
973
974 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
975 case QEMU_AIO_READ:
976 ret = handle_aiocb_rw(aiocb);
977 if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->bs->growable) {
978 iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
979 0, aiocb->aio_nbytes - ret);
980
981 ret = aiocb->aio_nbytes;
982 }
983 if (ret == aiocb->aio_nbytes) {
984 ret = 0;
985 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
986 ret = -EINVAL;
987 }
988 break;
989 case QEMU_AIO_WRITE:
990 ret = handle_aiocb_rw(aiocb);
991 if (ret == aiocb->aio_nbytes) {
992 ret = 0;
993 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
994 ret = -EINVAL;
995 }
996 break;
997 case QEMU_AIO_FLUSH:
998 ret = handle_aiocb_flush(aiocb);
999 break;
1000 case QEMU_AIO_IOCTL:
1001 ret = handle_aiocb_ioctl(aiocb);
1002 break;
1003 case QEMU_AIO_DISCARD:
1004 ret = handle_aiocb_discard(aiocb);
1005 break;
1006 case QEMU_AIO_WRITE_ZEROES:
1007 ret = handle_aiocb_write_zeroes(aiocb);
1008 break;
1009 default:
1010 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
1011 ret = -EINVAL;
1012 break;
1013 }
1014
1015 g_slice_free(RawPosixAIOData, aiocb);
1016 return ret;
1017 }
1018
1019 static int paio_submit_co(BlockDriverState *bs, int fd,
1020 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1021 int type)
1022 {
1023 RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
1024 ThreadPool *pool;
1025
1026 acb->bs = bs;
1027 acb->aio_type = type;
1028 acb->aio_fildes = fd;
1029
1030 acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
1031 acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
1032
1033 if (qiov) {
1034 acb->aio_iov = qiov->iov;
1035 acb->aio_niov = qiov->niov;
1036 assert(qiov->size == acb->aio_nbytes);
1037 }
1038
1039 trace_paio_submit_co(sector_num, nb_sectors, type);
1040 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1041 return thread_pool_submit_co(pool, aio_worker, acb);
1042 }
1043
1044 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
1045 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1046 BlockDriverCompletionFunc *cb, void *opaque, int type)
1047 {
1048 RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
1049 ThreadPool *pool;
1050
1051 acb->bs = bs;
1052 acb->aio_type = type;
1053 acb->aio_fildes = fd;
1054
1055 acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
1056 acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
1057
1058 if (qiov) {
1059 acb->aio_iov = qiov->iov;
1060 acb->aio_niov = qiov->niov;
1061 assert(qiov->size == acb->aio_nbytes);
1062 }
1063
1064 trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
1065 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1066 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
1067 }
1068
1069 static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
1070 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1071 BlockDriverCompletionFunc *cb, void *opaque, int type)
1072 {
1073 BDRVRawState *s = bs->opaque;
1074
1075 if (fd_open(bs) < 0)
1076 return NULL;
1077
1078 /*
1079 * If O_DIRECT is used the buffer needs to be aligned on a sector
1080 * boundary. Check if this is the case or tell the low-level
1081 * driver that it needs to copy the buffer.
1082 */
1083 if ((bs->open_flags & BDRV_O_NOCACHE)) {
1084 if (!bdrv_qiov_is_aligned(bs, qiov)) {
1085 type |= QEMU_AIO_MISALIGNED;
1086 #ifdef CONFIG_LINUX_AIO
1087 } else if (s->use_aio) {
1088 return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
1089 nb_sectors, cb, opaque, type);
1090 #endif
1091 }
1092 }
1093
1094 return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
1095 cb, opaque, type);
1096 }
1097
1098 static void raw_aio_plug(BlockDriverState *bs)
1099 {
1100 #ifdef CONFIG_LINUX_AIO
1101 BDRVRawState *s = bs->opaque;
1102 if (s->use_aio) {
1103 laio_io_plug(bs, s->aio_ctx);
1104 }
1105 #endif
1106 }
1107
1108 static void raw_aio_unplug(BlockDriverState *bs)
1109 {
1110 #ifdef CONFIG_LINUX_AIO
1111 BDRVRawState *s = bs->opaque;
1112 if (s->use_aio) {
1113 laio_io_unplug(bs, s->aio_ctx, true);
1114 }
1115 #endif
1116 }
1117
1118 static void raw_aio_flush_io_queue(BlockDriverState *bs)
1119 {
1120 #ifdef CONFIG_LINUX_AIO
1121 BDRVRawState *s = bs->opaque;
1122 if (s->use_aio) {
1123 laio_io_unplug(bs, s->aio_ctx, false);
1124 }
1125 #endif
1126 }
1127
1128 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
1129 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1130 BlockDriverCompletionFunc *cb, void *opaque)
1131 {
1132 return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
1133 cb, opaque, QEMU_AIO_READ);
1134 }
1135
1136 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
1137 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1138 BlockDriverCompletionFunc *cb, void *opaque)
1139 {
1140 return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
1141 cb, opaque, QEMU_AIO_WRITE);
1142 }
1143
1144 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
1145 BlockDriverCompletionFunc *cb, void *opaque)
1146 {
1147 BDRVRawState *s = bs->opaque;
1148
1149 if (fd_open(bs) < 0)
1150 return NULL;
1151
1152 return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
1153 }
1154
1155 static void raw_close(BlockDriverState *bs)
1156 {
1157 BDRVRawState *s = bs->opaque;
1158
1159 raw_detach_aio_context(bs);
1160
1161 #ifdef CONFIG_LINUX_AIO
1162 if (s->use_aio) {
1163 laio_cleanup(s->aio_ctx);
1164 }
1165 #endif
1166 if (s->fd >= 0) {
1167 qemu_close(s->fd);
1168 s->fd = -1;
1169 }
1170 }
1171
1172 static int raw_truncate(BlockDriverState *bs, int64_t offset)
1173 {
1174 BDRVRawState *s = bs->opaque;
1175 struct stat st;
1176
1177 if (fstat(s->fd, &st)) {
1178 return -errno;
1179 }
1180
1181 if (S_ISREG(st.st_mode)) {
1182 if (ftruncate(s->fd, offset) < 0) {
1183 return -errno;
1184 }
1185 } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1186 if (offset > raw_getlength(bs)) {
1187 return -EINVAL;
1188 }
1189 } else {
1190 return -ENOTSUP;
1191 }
1192
1193 return 0;
1194 }
1195
1196 #ifdef __OpenBSD__
1197 static int64_t raw_getlength(BlockDriverState *bs)
1198 {
1199 BDRVRawState *s = bs->opaque;
1200 int fd = s->fd;
1201 struct stat st;
1202
1203 if (fstat(fd, &st))
1204 return -errno;
1205 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1206 struct disklabel dl;
1207
1208 if (ioctl(fd, DIOCGDINFO, &dl))
1209 return -errno;
1210 return (uint64_t)dl.d_secsize *
1211 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1212 } else
1213 return st.st_size;
1214 }
1215 #elif defined(__NetBSD__)
1216 static int64_t raw_getlength(BlockDriverState *bs)
1217 {
1218 BDRVRawState *s = bs->opaque;
1219 int fd = s->fd;
1220 struct stat st;
1221
1222 if (fstat(fd, &st))
1223 return -errno;
1224 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1225 struct dkwedge_info dkw;
1226
1227 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
1228 return dkw.dkw_size * 512;
1229 } else {
1230 struct disklabel dl;
1231
1232 if (ioctl(fd, DIOCGDINFO, &dl))
1233 return -errno;
1234 return (uint64_t)dl.d_secsize *
1235 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1236 }
1237 } else
1238 return st.st_size;
1239 }
1240 #elif defined(__sun__)
1241 static int64_t raw_getlength(BlockDriverState *bs)
1242 {
1243 BDRVRawState *s = bs->opaque;
1244 struct dk_minfo minfo;
1245 int ret;
1246 int64_t size;
1247
1248 ret = fd_open(bs);
1249 if (ret < 0) {
1250 return ret;
1251 }
1252
1253 /*
1254 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1255 */
1256 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
1257 if (ret != -1) {
1258 return minfo.dki_lbsize * minfo.dki_capacity;
1259 }
1260
1261 /*
1262 * There are reports that lseek on some devices fails, but
1263 * irc discussion said that contingency on contingency was overkill.
1264 */
1265 size = lseek(s->fd, 0, SEEK_END);
1266 if (size < 0) {
1267 return -errno;
1268 }
1269 return size;
1270 }
1271 #elif defined(CONFIG_BSD)
1272 static int64_t raw_getlength(BlockDriverState *bs)
1273 {
1274 BDRVRawState *s = bs->opaque;
1275 int fd = s->fd;
1276 int64_t size;
1277 struct stat sb;
1278 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1279 int reopened = 0;
1280 #endif
1281 int ret;
1282
1283 ret = fd_open(bs);
1284 if (ret < 0)
1285 return ret;
1286
1287 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1288 again:
1289 #endif
1290 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
1291 #ifdef DIOCGMEDIASIZE
1292 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
1293 #elif defined(DIOCGPART)
1294 {
1295 struct partinfo pi;
1296 if (ioctl(fd, DIOCGPART, &pi) == 0)
1297 size = pi.media_size;
1298 else
1299 size = 0;
1300 }
1301 if (size == 0)
1302 #endif
1303 #if defined(__APPLE__) && defined(__MACH__)
1304 size = LLONG_MAX;
1305 #else
1306 size = lseek(fd, 0LL, SEEK_END);
1307 if (size < 0) {
1308 return -errno;
1309 }
1310 #endif
1311 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1312 switch(s->type) {
1313 case FTYPE_CD:
1314 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1315 if (size == 2048LL * (unsigned)-1)
1316 size = 0;
1317 /* XXX no disc? maybe we need to reopen... */
1318 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
1319 reopened = 1;
1320 goto again;
1321 }
1322 }
1323 #endif
1324 } else {
1325 size = lseek(fd, 0, SEEK_END);
1326 if (size < 0) {
1327 return -errno;
1328 }
1329 }
1330 return size;
1331 }
1332 #else
1333 static int64_t raw_getlength(BlockDriverState *bs)
1334 {
1335 BDRVRawState *s = bs->opaque;
1336 int ret;
1337 int64_t size;
1338
1339 ret = fd_open(bs);
1340 if (ret < 0) {
1341 return ret;
1342 }
1343
1344 size = lseek(s->fd, 0, SEEK_END);
1345 if (size < 0) {
1346 return -errno;
1347 }
1348 return size;
1349 }
1350 #endif
1351
1352 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
1353 {
1354 struct stat st;
1355 BDRVRawState *s = bs->opaque;
1356
1357 if (fstat(s->fd, &st) < 0) {
1358 return -errno;
1359 }
1360 return (int64_t)st.st_blocks * 512;
1361 }
1362
1363 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
1364 {
1365 int fd;
1366 int result = 0;
1367 int64_t total_size = 0;
1368 bool nocow = false;
1369 PreallocMode prealloc;
1370 char *buf = NULL;
1371 Error *local_err = NULL;
1372
1373 strstart(filename, "file:", &filename);
1374
1375 /* Read out options */
1376 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1377 BDRV_SECTOR_SIZE);
1378 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
1379 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1380 prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
1381 PREALLOC_MODE_MAX, PREALLOC_MODE_OFF,
1382 &local_err);
1383 g_free(buf);
1384 if (local_err) {
1385 error_propagate(errp, local_err);
1386 result = -EINVAL;
1387 goto out;
1388 }
1389
1390 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
1391 0644);
1392 if (fd < 0) {
1393 result = -errno;
1394 error_setg_errno(errp, -result, "Could not create file");
1395 goto out;
1396 }
1397
1398 if (nocow) {
1399 #ifdef __linux__
1400 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1401 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1402 * will be ignored since any failure of this operation should not
1403 * block the left work.
1404 */
1405 int attr;
1406 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
1407 attr |= FS_NOCOW_FL;
1408 ioctl(fd, FS_IOC_SETFLAGS, &attr);
1409 }
1410 #endif
1411 }
1412
1413 if (ftruncate(fd, total_size) != 0) {
1414 result = -errno;
1415 error_setg_errno(errp, -result, "Could not resize file");
1416 goto out_close;
1417 }
1418
1419 switch (prealloc) {
1420 #ifdef CONFIG_POSIX_FALLOCATE
1421 case PREALLOC_MODE_FALLOC:
1422 /* posix_fallocate() doesn't set errno. */
1423 result = -posix_fallocate(fd, 0, total_size);
1424 if (result != 0) {
1425 error_setg_errno(errp, -result,
1426 "Could not preallocate data for the new file");
1427 }
1428 break;
1429 #endif
1430 case PREALLOC_MODE_FULL:
1431 {
1432 int64_t num = 0, left = total_size;
1433 buf = g_malloc0(65536);
1434
1435 while (left > 0) {
1436 num = MIN(left, 65536);
1437 result = write(fd, buf, num);
1438 if (result < 0) {
1439 result = -errno;
1440 error_setg_errno(errp, -result,
1441 "Could not write to the new file");
1442 break;
1443 }
1444 left -= num;
1445 }
1446 fsync(fd);
1447 g_free(buf);
1448 break;
1449 }
1450 case PREALLOC_MODE_OFF:
1451 break;
1452 default:
1453 result = -EINVAL;
1454 error_setg(errp, "Unsupported preallocation mode: %s",
1455 PreallocMode_lookup[prealloc]);
1456 break;
1457 }
1458
1459 out_close:
1460 if (qemu_close(fd) != 0 && result == 0) {
1461 result = -errno;
1462 error_setg_errno(errp, -result, "Could not close the new file");
1463 }
1464 out:
1465 return result;
1466 }
1467
1468 static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
1469 off_t *hole, int nb_sectors, int *pnum)
1470 {
1471 #ifdef CONFIG_FIEMAP
1472 BDRVRawState *s = bs->opaque;
1473 int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
1474 struct {
1475 struct fiemap fm;
1476 struct fiemap_extent fe;
1477 } f;
1478
1479 if (s->skip_fiemap) {
1480 return -ENOTSUP;
1481 }
1482
1483 f.fm.fm_start = start;
1484 f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
1485 f.fm.fm_flags = 0;
1486 f.fm.fm_extent_count = 1;
1487 f.fm.fm_reserved = 0;
1488 if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
1489 s->skip_fiemap = true;
1490 return -errno;
1491 }
1492
1493 if (f.fm.fm_mapped_extents == 0) {
1494 /* No extents found, data is beyond f.fm.fm_start + f.fm.fm_length.
1495 * f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
1496 */
1497 off_t length = lseek(s->fd, 0, SEEK_END);
1498 *hole = f.fm.fm_start;
1499 *data = MIN(f.fm.fm_start + f.fm.fm_length, length);
1500 } else {
1501 *data = f.fe.fe_logical;
1502 *hole = f.fe.fe_logical + f.fe.fe_length;
1503 if (f.fe.fe_flags & FIEMAP_EXTENT_UNWRITTEN) {
1504 ret |= BDRV_BLOCK_ZERO;
1505 }
1506 }
1507
1508 return ret;
1509 #else
1510 return -ENOTSUP;
1511 #endif
1512 }
1513
1514 static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
1515 off_t *hole, int *pnum)
1516 {
1517 #if defined SEEK_HOLE && defined SEEK_DATA
1518 BDRVRawState *s = bs->opaque;
1519
1520 *hole = lseek(s->fd, start, SEEK_HOLE);
1521 if (*hole == -1) {
1522 /* -ENXIO indicates that sector_num was past the end of the file.
1523 * There is a virtual hole there. */
1524 assert(errno != -ENXIO);
1525
1526 return -errno;
1527 }
1528
1529 if (*hole > start) {
1530 *data = start;
1531 } else {
1532 /* On a hole. We need another syscall to find its end. */
1533 *data = lseek(s->fd, start, SEEK_DATA);
1534 if (*data == -1) {
1535 *data = lseek(s->fd, 0, SEEK_END);
1536 }
1537 }
1538
1539 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
1540 #else
1541 return -ENOTSUP;
1542 #endif
1543 }
1544
1545 /*
1546 * Returns true iff the specified sector is present in the disk image. Drivers
1547 * not implementing the functionality are assumed to not support backing files,
1548 * hence all their sectors are reported as allocated.
1549 *
1550 * If 'sector_num' is beyond the end of the disk image the return value is 0
1551 * and 'pnum' is set to 0.
1552 *
1553 * 'pnum' is set to the number of sectors (including and immediately following
1554 * the specified sector) that are known to be in the same
1555 * allocated/unallocated state.
1556 *
1557 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
1558 * beyond the end of the disk image it will be clamped.
1559 */
1560 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
1561 int64_t sector_num,
1562 int nb_sectors, int *pnum)
1563 {
1564 off_t start, data = 0, hole = 0;
1565 int64_t ret;
1566
1567 ret = fd_open(bs);
1568 if (ret < 0) {
1569 return ret;
1570 }
1571
1572 start = sector_num * BDRV_SECTOR_SIZE;
1573
1574 ret = try_fiemap(bs, start, &data, &hole, nb_sectors, pnum);
1575 if (ret < 0) {
1576 ret = try_seek_hole(bs, start, &data, &hole, pnum);
1577 if (ret < 0) {
1578 /* Assume everything is allocated. */
1579 data = 0;
1580 hole = start + nb_sectors * BDRV_SECTOR_SIZE;
1581 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
1582 }
1583 }
1584
1585 if (data <= start) {
1586 /* On a data extent, compute sectors to the end of the extent. */
1587 *pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
1588 } else {
1589 /* On a hole, compute sectors to the beginning of the next extent. */
1590 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
1591 ret &= ~BDRV_BLOCK_DATA;
1592 ret |= BDRV_BLOCK_ZERO;
1593 }
1594
1595 return ret;
1596 }
1597
1598 static coroutine_fn BlockDriverAIOCB *raw_aio_discard(BlockDriverState *bs,
1599 int64_t sector_num, int nb_sectors,
1600 BlockDriverCompletionFunc *cb, void *opaque)
1601 {
1602 BDRVRawState *s = bs->opaque;
1603
1604 return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
1605 cb, opaque, QEMU_AIO_DISCARD);
1606 }
1607
1608 static int coroutine_fn raw_co_write_zeroes(
1609 BlockDriverState *bs, int64_t sector_num,
1610 int nb_sectors, BdrvRequestFlags flags)
1611 {
1612 BDRVRawState *s = bs->opaque;
1613
1614 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
1615 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
1616 QEMU_AIO_WRITE_ZEROES);
1617 } else if (s->discard_zeroes) {
1618 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
1619 QEMU_AIO_DISCARD);
1620 }
1621 return -ENOTSUP;
1622 }
1623
1624 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1625 {
1626 BDRVRawState *s = bs->opaque;
1627
1628 bdi->unallocated_blocks_are_zero = s->discard_zeroes;
1629 bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
1630 return 0;
1631 }
1632
1633 static QemuOptsList raw_create_opts = {
1634 .name = "raw-create-opts",
1635 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
1636 .desc = {
1637 {
1638 .name = BLOCK_OPT_SIZE,
1639 .type = QEMU_OPT_SIZE,
1640 .help = "Virtual disk size"
1641 },
1642 {
1643 .name = BLOCK_OPT_NOCOW,
1644 .type = QEMU_OPT_BOOL,
1645 .help = "Turn off copy-on-write (valid only on btrfs)"
1646 },
1647 {
1648 .name = BLOCK_OPT_PREALLOC,
1649 .type = QEMU_OPT_STRING,
1650 .help = "Preallocation mode (allowed values: off, falloc, full)"
1651 },
1652 { /* end of list */ }
1653 }
1654 };
1655
1656 static BlockDriver bdrv_file = {
1657 .format_name = "file",
1658 .protocol_name = "file",
1659 .instance_size = sizeof(BDRVRawState),
1660 .bdrv_needs_filename = true,
1661 .bdrv_probe = NULL, /* no probe for protocols */
1662 .bdrv_parse_filename = raw_parse_filename,
1663 .bdrv_file_open = raw_open,
1664 .bdrv_reopen_prepare = raw_reopen_prepare,
1665 .bdrv_reopen_commit = raw_reopen_commit,
1666 .bdrv_reopen_abort = raw_reopen_abort,
1667 .bdrv_close = raw_close,
1668 .bdrv_create = raw_create,
1669 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1670 .bdrv_co_get_block_status = raw_co_get_block_status,
1671 .bdrv_co_write_zeroes = raw_co_write_zeroes,
1672
1673 .bdrv_aio_readv = raw_aio_readv,
1674 .bdrv_aio_writev = raw_aio_writev,
1675 .bdrv_aio_flush = raw_aio_flush,
1676 .bdrv_aio_discard = raw_aio_discard,
1677 .bdrv_refresh_limits = raw_refresh_limits,
1678 .bdrv_io_plug = raw_aio_plug,
1679 .bdrv_io_unplug = raw_aio_unplug,
1680 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
1681
1682 .bdrv_truncate = raw_truncate,
1683 .bdrv_getlength = raw_getlength,
1684 .bdrv_get_info = raw_get_info,
1685 .bdrv_get_allocated_file_size
1686 = raw_get_allocated_file_size,
1687
1688 .bdrv_detach_aio_context = raw_detach_aio_context,
1689 .bdrv_attach_aio_context = raw_attach_aio_context,
1690
1691 .create_opts = &raw_create_opts,
1692 };
1693
1694 /***********************************************/
1695 /* host device */
1696
1697 #if defined(__APPLE__) && defined(__MACH__)
1698 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
1699 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
1700
1701 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
1702 {
1703 kern_return_t kernResult;
1704 mach_port_t masterPort;
1705 CFMutableDictionaryRef classesToMatch;
1706
1707 kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
1708 if ( KERN_SUCCESS != kernResult ) {
1709 printf( "IOMasterPort returned %d\n", kernResult );
1710 }
1711
1712 classesToMatch = IOServiceMatching( kIOCDMediaClass );
1713 if ( classesToMatch == NULL ) {
1714 printf( "IOServiceMatching returned a NULL dictionary.\n" );
1715 } else {
1716 CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
1717 }
1718 kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
1719 if ( KERN_SUCCESS != kernResult )
1720 {
1721 printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
1722 }
1723
1724 return kernResult;
1725 }
1726
1727 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
1728 {
1729 io_object_t nextMedia;
1730 kern_return_t kernResult = KERN_FAILURE;
1731 *bsdPath = '\0';
1732 nextMedia = IOIteratorNext( mediaIterator );
1733 if ( nextMedia )
1734 {
1735 CFTypeRef bsdPathAsCFString;
1736 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
1737 if ( bsdPathAsCFString ) {
1738 size_t devPathLength;
1739 strcpy( bsdPath, _PATH_DEV );
1740 strcat( bsdPath, "r" );
1741 devPathLength = strlen( bsdPath );
1742 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
1743 kernResult = KERN_SUCCESS;
1744 }
1745 CFRelease( bsdPathAsCFString );
1746 }
1747 IOObjectRelease( nextMedia );
1748 }
1749
1750 return kernResult;
1751 }
1752
1753 #endif
1754
1755 static int hdev_probe_device(const char *filename)
1756 {
1757 struct stat st;
1758
1759 /* allow a dedicated CD-ROM driver to match with a higher priority */
1760 if (strstart(filename, "/dev/cdrom", NULL))
1761 return 50;
1762
1763 if (stat(filename, &st) >= 0 &&
1764 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
1765 return 100;
1766 }
1767
1768 return 0;
1769 }
1770
1771 static int check_hdev_writable(BDRVRawState *s)
1772 {
1773 #if defined(BLKROGET)
1774 /* Linux block devices can be configured "read-only" using blockdev(8).
1775 * This is independent of device node permissions and therefore open(2)
1776 * with O_RDWR succeeds. Actual writes fail with EPERM.
1777 *
1778 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
1779 * check for read-only block devices so that Linux block devices behave
1780 * properly.
1781 */
1782 struct stat st;
1783 int readonly = 0;
1784
1785 if (fstat(s->fd, &st)) {
1786 return -errno;
1787 }
1788
1789 if (!S_ISBLK(st.st_mode)) {
1790 return 0;
1791 }
1792
1793 if (ioctl(s->fd, BLKROGET, &readonly) < 0) {
1794 return -errno;
1795 }
1796
1797 if (readonly) {
1798 return -EACCES;
1799 }
1800 #endif /* defined(BLKROGET) */
1801 return 0;
1802 }
1803
1804 static void hdev_parse_filename(const char *filename, QDict *options,
1805 Error **errp)
1806 {
1807 /* The prefix is optional, just as for "file". */
1808 strstart(filename, "host_device:", &filename);
1809
1810 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
1811 }
1812
1813 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
1814 Error **errp)
1815 {
1816 BDRVRawState *s = bs->opaque;
1817 Error *local_err = NULL;
1818 int ret;
1819 const char *filename = qdict_get_str(options, "filename");
1820
1821 #if defined(__APPLE__) && defined(__MACH__)
1822 if (strstart(filename, "/dev/cdrom", NULL)) {
1823 kern_return_t kernResult;
1824 io_iterator_t mediaIterator;
1825 char bsdPath[ MAXPATHLEN ];
1826 int fd;
1827
1828 kernResult = FindEjectableCDMedia( &mediaIterator );
1829 kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
1830
1831 if ( bsdPath[ 0 ] != '\0' ) {
1832 strcat(bsdPath,"s0");
1833 /* some CDs don't have a partition 0 */
1834 fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
1835 if (fd < 0) {
1836 bsdPath[strlen(bsdPath)-1] = '1';
1837 } else {
1838 qemu_close(fd);
1839 }
1840 filename = bsdPath;
1841 qdict_put(options, "filename", qstring_from_str(filename));
1842 }
1843
1844 if ( mediaIterator )
1845 IOObjectRelease( mediaIterator );
1846 }
1847 #endif
1848
1849 s->type = FTYPE_FILE;
1850 #if defined(__linux__)
1851 {
1852 char resolved_path[ MAXPATHLEN ], *temp;
1853
1854 temp = realpath(filename, resolved_path);
1855 if (temp && strstart(temp, "/dev/sg", NULL)) {
1856 bs->sg = 1;
1857 }
1858 }
1859 #endif
1860
1861 ret = raw_open_common(bs, options, flags, 0, &local_err);
1862 if (ret < 0) {
1863 if (local_err) {
1864 error_propagate(errp, local_err);
1865 }
1866 return ret;
1867 }
1868
1869 if (flags & BDRV_O_RDWR) {
1870 ret = check_hdev_writable(s);
1871 if (ret < 0) {
1872 raw_close(bs);
1873 error_setg_errno(errp, -ret, "The device is not writable");
1874 return ret;
1875 }
1876 }
1877
1878 return ret;
1879 }
1880
1881 #if defined(__linux__)
1882 /* Note: we do not have a reliable method to detect if the floppy is
1883 present. The current method is to try to open the floppy at every
1884 I/O and to keep it opened during a few hundreds of ms. */
1885 static int fd_open(BlockDriverState *bs)
1886 {
1887 BDRVRawState *s = bs->opaque;
1888 int last_media_present;
1889
1890 if (s->type != FTYPE_FD)
1891 return 0;
1892 last_media_present = (s->fd >= 0);
1893 if (s->fd >= 0 &&
1894 (get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
1895 qemu_close(s->fd);
1896 s->fd = -1;
1897 #ifdef DEBUG_FLOPPY
1898 printf("Floppy closed\n");
1899 #endif
1900 }
1901 if (s->fd < 0) {
1902 if (s->fd_got_error &&
1903 (get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1904 #ifdef DEBUG_FLOPPY
1905 printf("No floppy (open delayed)\n");
1906 #endif
1907 return -EIO;
1908 }
1909 s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
1910 if (s->fd < 0) {
1911 s->fd_error_time = get_clock();
1912 s->fd_got_error = 1;
1913 if (last_media_present)
1914 s->fd_media_changed = 1;
1915 #ifdef DEBUG_FLOPPY
1916 printf("No floppy\n");
1917 #endif
1918 return -EIO;
1919 }
1920 #ifdef DEBUG_FLOPPY
1921 printf("Floppy opened\n");
1922 #endif
1923 }
1924 if (!last_media_present)
1925 s->fd_media_changed = 1;
1926 s->fd_open_time = get_clock();
1927 s->fd_got_error = 0;
1928 return 0;
1929 }
1930
1931 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1932 {
1933 BDRVRawState *s = bs->opaque;
1934
1935 return ioctl(s->fd, req, buf);
1936 }
1937
1938 static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
1939 unsigned long int req, void *buf,
1940 BlockDriverCompletionFunc *cb, void *opaque)
1941 {
1942 BDRVRawState *s = bs->opaque;
1943 RawPosixAIOData *acb;
1944 ThreadPool *pool;
1945
1946 if (fd_open(bs) < 0)
1947 return NULL;
1948
1949 acb = g_slice_new(RawPosixAIOData);
1950 acb->bs = bs;
1951 acb->aio_type = QEMU_AIO_IOCTL;
1952 acb->aio_fildes = s->fd;
1953 acb->aio_offset = 0;
1954 acb->aio_ioctl_buf = buf;
1955 acb->aio_ioctl_cmd = req;
1956 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1957 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
1958 }
1959
1960 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1961 static int fd_open(BlockDriverState *bs)
1962 {
1963 BDRVRawState *s = bs->opaque;
1964
1965 /* this is just to ensure s->fd is sane (its called by io ops) */
1966 if (s->fd >= 0)
1967 return 0;
1968 return -EIO;
1969 }
1970 #else /* !linux && !FreeBSD */
1971
1972 static int fd_open(BlockDriverState *bs)
1973 {
1974 return 0;
1975 }
1976
1977 #endif /* !linux && !FreeBSD */
1978
1979 static coroutine_fn BlockDriverAIOCB *hdev_aio_discard(BlockDriverState *bs,
1980 int64_t sector_num, int nb_sectors,
1981 BlockDriverCompletionFunc *cb, void *opaque)
1982 {
1983 BDRVRawState *s = bs->opaque;
1984
1985 if (fd_open(bs) < 0) {
1986 return NULL;
1987 }
1988 return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
1989 cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
1990 }
1991
1992 static coroutine_fn int hdev_co_write_zeroes(BlockDriverState *bs,
1993 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
1994 {
1995 BDRVRawState *s = bs->opaque;
1996 int rc;
1997
1998 rc = fd_open(bs);
1999 if (rc < 0) {
2000 return rc;
2001 }
2002 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
2003 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
2004 QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
2005 } else if (s->discard_zeroes) {
2006 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
2007 QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
2008 }
2009 return -ENOTSUP;
2010 }
2011
2012 static int hdev_create(const char *filename, QemuOpts *opts,
2013 Error **errp)
2014 {
2015 int fd;
2016 int ret = 0;
2017 struct stat stat_buf;
2018 int64_t total_size = 0;
2019 bool has_prefix;
2020
2021 /* This function is used by all three protocol block drivers and therefore
2022 * any of these three prefixes may be given.
2023 * The return value has to be stored somewhere, otherwise this is an error
2024 * due to -Werror=unused-value. */
2025 has_prefix =
2026 strstart(filename, "host_device:", &filename) ||
2027 strstart(filename, "host_cdrom:" , &filename) ||
2028 strstart(filename, "host_floppy:", &filename);
2029
2030 (void)has_prefix;
2031
2032 /* Read out options */
2033 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2034 BDRV_SECTOR_SIZE);
2035
2036 fd = qemu_open(filename, O_WRONLY | O_BINARY);
2037 if (fd < 0) {
2038 ret = -errno;
2039 error_setg_errno(errp, -ret, "Could not open device");
2040 return ret;
2041 }
2042
2043 if (fstat(fd, &stat_buf) < 0) {
2044 ret = -errno;
2045 error_setg_errno(errp, -ret, "Could not stat device");
2046 } else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
2047 error_setg(errp,
2048 "The given file is neither a block nor a character device");
2049 ret = -ENODEV;
2050 } else if (lseek(fd, 0, SEEK_END) < total_size) {
2051 error_setg(errp, "Device is too small");
2052 ret = -ENOSPC;
2053 }
2054
2055 qemu_close(fd);
2056 return ret;
2057 }
2058
2059 static BlockDriver bdrv_host_device = {
2060 .format_name = "host_device",
2061 .protocol_name = "host_device",
2062 .instance_size = sizeof(BDRVRawState),
2063 .bdrv_needs_filename = true,
2064 .bdrv_probe_device = hdev_probe_device,
2065 .bdrv_parse_filename = hdev_parse_filename,
2066 .bdrv_file_open = hdev_open,
2067 .bdrv_close = raw_close,
2068 .bdrv_reopen_prepare = raw_reopen_prepare,
2069 .bdrv_reopen_commit = raw_reopen_commit,
2070 .bdrv_reopen_abort = raw_reopen_abort,
2071 .bdrv_create = hdev_create,
2072 .create_opts = &raw_create_opts,
2073 .bdrv_co_write_zeroes = hdev_co_write_zeroes,
2074
2075 .bdrv_aio_readv = raw_aio_readv,
2076 .bdrv_aio_writev = raw_aio_writev,
2077 .bdrv_aio_flush = raw_aio_flush,
2078 .bdrv_aio_discard = hdev_aio_discard,
2079 .bdrv_refresh_limits = raw_refresh_limits,
2080 .bdrv_io_plug = raw_aio_plug,
2081 .bdrv_io_unplug = raw_aio_unplug,
2082 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2083
2084 .bdrv_truncate = raw_truncate,
2085 .bdrv_getlength = raw_getlength,
2086 .bdrv_get_info = raw_get_info,
2087 .bdrv_get_allocated_file_size
2088 = raw_get_allocated_file_size,
2089
2090 .bdrv_detach_aio_context = raw_detach_aio_context,
2091 .bdrv_attach_aio_context = raw_attach_aio_context,
2092
2093 /* generic scsi device */
2094 #ifdef __linux__
2095 .bdrv_ioctl = hdev_ioctl,
2096 .bdrv_aio_ioctl = hdev_aio_ioctl,
2097 #endif
2098 };
2099
2100 #ifdef __linux__
2101 static void floppy_parse_filename(const char *filename, QDict *options,
2102 Error **errp)
2103 {
2104 /* The prefix is optional, just as for "file". */
2105 strstart(filename, "host_floppy:", &filename);
2106
2107 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
2108 }
2109
2110 static int floppy_open(BlockDriverState *bs, QDict *options, int flags,
2111 Error **errp)
2112 {
2113 BDRVRawState *s = bs->opaque;
2114 Error *local_err = NULL;
2115 int ret;
2116
2117 s->type = FTYPE_FD;
2118
2119 /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
2120 ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
2121 if (ret) {
2122 if (local_err) {
2123 error_propagate(errp, local_err);
2124 }
2125 return ret;
2126 }
2127
2128 /* close fd so that we can reopen it as needed */
2129 qemu_close(s->fd);
2130 s->fd = -1;
2131 s->fd_media_changed = 1;
2132
2133 return 0;
2134 }
2135
2136 static int floppy_probe_device(const char *filename)
2137 {
2138 int fd, ret;
2139 int prio = 0;
2140 struct floppy_struct fdparam;
2141 struct stat st;
2142
2143 if (strstart(filename, "/dev/fd", NULL) &&
2144 !strstart(filename, "/dev/fdset/", NULL)) {
2145 prio = 50;
2146 }
2147
2148 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
2149 if (fd < 0) {
2150 goto out;
2151 }
2152 ret = fstat(fd, &st);
2153 if (ret == -1 || !S_ISBLK(st.st_mode)) {
2154 goto outc;
2155 }
2156
2157 /* Attempt to detect via a floppy specific ioctl */
2158 ret = ioctl(fd, FDGETPRM, &fdparam);
2159 if (ret >= 0)
2160 prio = 100;
2161
2162 outc:
2163 qemu_close(fd);
2164 out:
2165 return prio;
2166 }
2167
2168
2169 static int floppy_is_inserted(BlockDriverState *bs)
2170 {
2171 return fd_open(bs) >= 0;
2172 }
2173
2174 static int floppy_media_changed(BlockDriverState *bs)
2175 {
2176 BDRVRawState *s = bs->opaque;
2177 int ret;
2178
2179 /*
2180 * XXX: we do not have a true media changed indication.
2181 * It does not work if the floppy is changed without trying to read it.
2182 */
2183 fd_open(bs);
2184 ret = s->fd_media_changed;
2185 s->fd_media_changed = 0;
2186 #ifdef DEBUG_FLOPPY
2187 printf("Floppy changed=%d\n", ret);
2188 #endif
2189 return ret;
2190 }
2191
2192 static void floppy_eject(BlockDriverState *bs, bool eject_flag)
2193 {
2194 BDRVRawState *s = bs->opaque;
2195 int fd;
2196
2197 if (s->fd >= 0) {
2198 qemu_close(s->fd);
2199 s->fd = -1;
2200 }
2201 fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
2202 if (fd >= 0) {
2203 if (ioctl(fd, FDEJECT, 0) < 0)
2204 perror("FDEJECT");
2205 qemu_close(fd);
2206 }
2207 }
2208
2209 static BlockDriver bdrv_host_floppy = {
2210 .format_name = "host_floppy",
2211 .protocol_name = "host_floppy",
2212 .instance_size = sizeof(BDRVRawState),
2213 .bdrv_needs_filename = true,
2214 .bdrv_probe_device = floppy_probe_device,
2215 .bdrv_parse_filename = floppy_parse_filename,
2216 .bdrv_file_open = floppy_open,
2217 .bdrv_close = raw_close,
2218 .bdrv_reopen_prepare = raw_reopen_prepare,
2219 .bdrv_reopen_commit = raw_reopen_commit,
2220 .bdrv_reopen_abort = raw_reopen_abort,
2221 .bdrv_create = hdev_create,
2222 .create_opts = &raw_create_opts,
2223
2224 .bdrv_aio_readv = raw_aio_readv,
2225 .bdrv_aio_writev = raw_aio_writev,
2226 .bdrv_aio_flush = raw_aio_flush,
2227 .bdrv_refresh_limits = raw_refresh_limits,
2228 .bdrv_io_plug = raw_aio_plug,
2229 .bdrv_io_unplug = raw_aio_unplug,
2230 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2231
2232 .bdrv_truncate = raw_truncate,
2233 .bdrv_getlength = raw_getlength,
2234 .has_variable_length = true,
2235 .bdrv_get_allocated_file_size
2236 = raw_get_allocated_file_size,
2237
2238 .bdrv_detach_aio_context = raw_detach_aio_context,
2239 .bdrv_attach_aio_context = raw_attach_aio_context,
2240
2241 /* removable device support */
2242 .bdrv_is_inserted = floppy_is_inserted,
2243 .bdrv_media_changed = floppy_media_changed,
2244 .bdrv_eject = floppy_eject,
2245 };
2246 #endif
2247
2248 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2249 static void cdrom_parse_filename(const char *filename, QDict *options,
2250 Error **errp)
2251 {
2252 /* The prefix is optional, just as for "file". */
2253 strstart(filename, "host_cdrom:", &filename);
2254
2255 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
2256 }
2257 #endif
2258
2259 #ifdef __linux__
2260 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2261 Error **errp)
2262 {
2263 BDRVRawState *s = bs->opaque;
2264 Error *local_err = NULL;
2265 int ret;
2266
2267 s->type = FTYPE_CD;
2268
2269 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2270 ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
2271 if (local_err) {
2272 error_propagate(errp, local_err);
2273 }
2274 return ret;
2275 }
2276
2277 static int cdrom_probe_device(const char *filename)
2278 {
2279 int fd, ret;
2280 int prio = 0;
2281 struct stat st;
2282
2283 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
2284 if (fd < 0) {
2285 goto out;
2286 }
2287 ret = fstat(fd, &st);
2288 if (ret == -1 || !S_ISBLK(st.st_mode)) {
2289 goto outc;
2290 }
2291
2292 /* Attempt to detect via a CDROM specific ioctl */
2293 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2294 if (ret >= 0)
2295 prio = 100;
2296
2297 outc:
2298 qemu_close(fd);
2299 out:
2300 return prio;
2301 }
2302
2303 static int cdrom_is_inserted(BlockDriverState *bs)
2304 {
2305 BDRVRawState *s = bs->opaque;
2306 int ret;
2307
2308 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2309 if (ret == CDS_DISC_OK)
2310 return 1;
2311 return 0;
2312 }
2313
2314 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2315 {
2316 BDRVRawState *s = bs->opaque;
2317
2318 if (eject_flag) {
2319 if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
2320 perror("CDROMEJECT");
2321 } else {
2322 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
2323 perror("CDROMEJECT");
2324 }
2325 }
2326
2327 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2328 {
2329 BDRVRawState *s = bs->opaque;
2330
2331 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
2332 /*
2333 * Note: an error can happen if the distribution automatically
2334 * mounts the CD-ROM
2335 */
2336 /* perror("CDROM_LOCKDOOR"); */
2337 }
2338 }
2339
2340 static BlockDriver bdrv_host_cdrom = {
2341 .format_name = "host_cdrom",
2342 .protocol_name = "host_cdrom",
2343 .instance_size = sizeof(BDRVRawState),
2344 .bdrv_needs_filename = true,
2345 .bdrv_probe_device = cdrom_probe_device,
2346 .bdrv_parse_filename = cdrom_parse_filename,
2347 .bdrv_file_open = cdrom_open,
2348 .bdrv_close = raw_close,
2349 .bdrv_reopen_prepare = raw_reopen_prepare,
2350 .bdrv_reopen_commit = raw_reopen_commit,
2351 .bdrv_reopen_abort = raw_reopen_abort,
2352 .bdrv_create = hdev_create,
2353 .create_opts = &raw_create_opts,
2354
2355 .bdrv_aio_readv = raw_aio_readv,
2356 .bdrv_aio_writev = raw_aio_writev,
2357 .bdrv_aio_flush = raw_aio_flush,
2358 .bdrv_refresh_limits = raw_refresh_limits,
2359 .bdrv_io_plug = raw_aio_plug,
2360 .bdrv_io_unplug = raw_aio_unplug,
2361 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2362
2363 .bdrv_truncate = raw_truncate,
2364 .bdrv_getlength = raw_getlength,
2365 .has_variable_length = true,
2366 .bdrv_get_allocated_file_size
2367 = raw_get_allocated_file_size,
2368
2369 .bdrv_detach_aio_context = raw_detach_aio_context,
2370 .bdrv_attach_aio_context = raw_attach_aio_context,
2371
2372 /* removable device support */
2373 .bdrv_is_inserted = cdrom_is_inserted,
2374 .bdrv_eject = cdrom_eject,
2375 .bdrv_lock_medium = cdrom_lock_medium,
2376
2377 /* generic scsi device */
2378 .bdrv_ioctl = hdev_ioctl,
2379 .bdrv_aio_ioctl = hdev_aio_ioctl,
2380 };
2381 #endif /* __linux__ */
2382
2383 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2384 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2385 Error **errp)
2386 {
2387 BDRVRawState *s = bs->opaque;
2388 Error *local_err = NULL;
2389 int ret;
2390
2391 s->type = FTYPE_CD;
2392
2393 ret = raw_open_common(bs, options, flags, 0, &local_err);
2394 if (ret) {
2395 if (local_err) {
2396 error_propagate(errp, local_err);
2397 }
2398 return ret;
2399 }
2400
2401 /* make sure the door isn't locked at this time */
2402 ioctl(s->fd, CDIOCALLOW);
2403 return 0;
2404 }
2405
2406 static int cdrom_probe_device(const char *filename)
2407 {
2408 if (strstart(filename, "/dev/cd", NULL) ||
2409 strstart(filename, "/dev/acd", NULL))
2410 return 100;
2411 return 0;
2412 }
2413
2414 static int cdrom_reopen(BlockDriverState *bs)
2415 {
2416 BDRVRawState *s = bs->opaque;
2417 int fd;
2418
2419 /*
2420 * Force reread of possibly changed/newly loaded disc,
2421 * FreeBSD seems to not notice sometimes...
2422 */
2423 if (s->fd >= 0)
2424 qemu_close(s->fd);
2425 fd = qemu_open(bs->filename, s->open_flags, 0644);
2426 if (fd < 0) {
2427 s->fd = -1;
2428 return -EIO;
2429 }
2430 s->fd = fd;
2431
2432 /* make sure the door isn't locked at this time */
2433 ioctl(s->fd, CDIOCALLOW);
2434 return 0;
2435 }
2436
2437 static int cdrom_is_inserted(BlockDriverState *bs)
2438 {
2439 return raw_getlength(bs) > 0;
2440 }
2441
2442 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2443 {
2444 BDRVRawState *s = bs->opaque;
2445
2446 if (s->fd < 0)
2447 return;
2448
2449 (void) ioctl(s->fd, CDIOCALLOW);
2450
2451 if (eject_flag) {
2452 if (ioctl(s->fd, CDIOCEJECT) < 0)
2453 perror("CDIOCEJECT");
2454 } else {
2455 if (ioctl(s->fd, CDIOCCLOSE) < 0)
2456 perror("CDIOCCLOSE");
2457 }
2458
2459 cdrom_reopen(bs);
2460 }
2461
2462 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2463 {
2464 BDRVRawState *s = bs->opaque;
2465
2466 if (s->fd < 0)
2467 return;
2468 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
2469 /*
2470 * Note: an error can happen if the distribution automatically
2471 * mounts the CD-ROM
2472 */
2473 /* perror("CDROM_LOCKDOOR"); */
2474 }
2475 }
2476
2477 static BlockDriver bdrv_host_cdrom = {
2478 .format_name = "host_cdrom",
2479 .protocol_name = "host_cdrom",
2480 .instance_size = sizeof(BDRVRawState),
2481 .bdrv_needs_filename = true,
2482 .bdrv_probe_device = cdrom_probe_device,
2483 .bdrv_parse_filename = cdrom_parse_filename,
2484 .bdrv_file_open = cdrom_open,
2485 .bdrv_close = raw_close,
2486 .bdrv_reopen_prepare = raw_reopen_prepare,
2487 .bdrv_reopen_commit = raw_reopen_commit,
2488 .bdrv_reopen_abort = raw_reopen_abort,
2489 .bdrv_create = hdev_create,
2490 .create_opts = &raw_create_opts,
2491
2492 .bdrv_aio_readv = raw_aio_readv,
2493 .bdrv_aio_writev = raw_aio_writev,
2494 .bdrv_aio_flush = raw_aio_flush,
2495 .bdrv_refresh_limits = raw_refresh_limits,
2496 .bdrv_io_plug = raw_aio_plug,
2497 .bdrv_io_unplug = raw_aio_unplug,
2498 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2499
2500 .bdrv_truncate = raw_truncate,
2501 .bdrv_getlength = raw_getlength,
2502 .has_variable_length = true,
2503 .bdrv_get_allocated_file_size
2504 = raw_get_allocated_file_size,
2505
2506 .bdrv_detach_aio_context = raw_detach_aio_context,
2507 .bdrv_attach_aio_context = raw_attach_aio_context,
2508
2509 /* removable device support */
2510 .bdrv_is_inserted = cdrom_is_inserted,
2511 .bdrv_eject = cdrom_eject,
2512 .bdrv_lock_medium = cdrom_lock_medium,
2513 };
2514 #endif /* __FreeBSD__ */
2515
2516 static void bdrv_file_init(void)
2517 {
2518 /*
2519 * Register all the drivers. Note that order is important, the driver
2520 * registered last will get probed first.
2521 */
2522 bdrv_register(&bdrv_file);
2523 bdrv_register(&bdrv_host_device);
2524 #ifdef __linux__
2525 bdrv_register(&bdrv_host_floppy);
2526 bdrv_register(&bdrv_host_cdrom);
2527 #endif
2528 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2529 bdrv_register(&bdrv_host_cdrom);
2530 #endif
2531 }
2532
2533 block_init(bdrv_file_init);
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