s390x/css: remove unused error handling branch
[qemu/ar7.git] / block / file-posix.c
blob6acbd56238b5fa2f534dec839fdf61350da3e364
1 /*
2 * Block driver for RAW files (posix)
4 * Copyright (c) 2006 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 #include "qemu/osdep.h"
25 #include "qapi/error.h"
26 #include "qemu/cutils.h"
27 #include "qemu/error-report.h"
28 #include "block/block_int.h"
29 #include "qemu/module.h"
30 #include "trace.h"
31 #include "block/thread-pool.h"
32 #include "qemu/iov.h"
33 #include "block/raw-aio.h"
34 #include "qapi/qmp/qstring.h"
36 #if defined(__APPLE__) && (__MACH__)
37 #include <paths.h>
38 #include <sys/param.h>
39 #include <IOKit/IOKitLib.h>
40 #include <IOKit/IOBSD.h>
41 #include <IOKit/storage/IOMediaBSDClient.h>
42 #include <IOKit/storage/IOMedia.h>
43 #include <IOKit/storage/IOCDMedia.h>
44 //#include <IOKit/storage/IOCDTypes.h>
45 #include <IOKit/storage/IODVDMedia.h>
46 #include <CoreFoundation/CoreFoundation.h>
47 #endif
49 #ifdef __sun__
50 #define _POSIX_PTHREAD_SEMANTICS 1
51 #include <sys/dkio.h>
52 #endif
53 #ifdef __linux__
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 #include <linux/hdreg.h>
60 #include <scsi/sg.h>
61 #ifdef __s390__
62 #include <asm/dasd.h>
63 #endif
64 #ifndef FS_NOCOW_FL
65 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
66 #endif
67 #endif
68 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
69 #include <linux/falloc.h>
70 #endif
71 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
72 #include <sys/disk.h>
73 #include <sys/cdio.h>
74 #endif
76 #ifdef __OpenBSD__
77 #include <sys/ioctl.h>
78 #include <sys/disklabel.h>
79 #include <sys/dkio.h>
80 #endif
82 #ifdef __NetBSD__
83 #include <sys/ioctl.h>
84 #include <sys/disklabel.h>
85 #include <sys/dkio.h>
86 #include <sys/disk.h>
87 #endif
89 #ifdef __DragonFly__
90 #include <sys/ioctl.h>
91 #include <sys/diskslice.h>
92 #endif
94 #ifdef CONFIG_XFS
95 #include <xfs/xfs.h>
96 #endif
98 //#define DEBUG_BLOCK
100 #ifdef DEBUG_BLOCK
101 # define DEBUG_BLOCK_PRINT 1
102 #else
103 # define DEBUG_BLOCK_PRINT 0
104 #endif
105 #define DPRINTF(fmt, ...) \
106 do { \
107 if (DEBUG_BLOCK_PRINT) { \
108 printf(fmt, ## __VA_ARGS__); \
110 } while (0)
112 /* OS X does not have O_DSYNC */
113 #ifndef O_DSYNC
114 #ifdef O_SYNC
115 #define O_DSYNC O_SYNC
116 #elif defined(O_FSYNC)
117 #define O_DSYNC O_FSYNC
118 #endif
119 #endif
121 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
122 #ifndef O_DIRECT
123 #define O_DIRECT O_DSYNC
124 #endif
126 #define FTYPE_FILE 0
127 #define FTYPE_CD 1
129 #define MAX_BLOCKSIZE 4096
131 /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes,
132 * leaving a few more bytes for its future use. */
133 #define RAW_LOCK_PERM_BASE 100
134 #define RAW_LOCK_SHARED_BASE 200
136 typedef struct BDRVRawState {
137 int fd;
138 int lock_fd;
139 bool use_lock;
140 int type;
141 int open_flags;
142 size_t buf_align;
144 /* The current permissions. */
145 uint64_t perm;
146 uint64_t shared_perm;
148 #ifdef CONFIG_XFS
149 bool is_xfs:1;
150 #endif
151 bool has_discard:1;
152 bool has_write_zeroes:1;
153 bool discard_zeroes:1;
154 bool use_linux_aio:1;
155 bool page_cache_inconsistent:1;
156 bool has_fallocate;
157 bool needs_alignment;
158 } BDRVRawState;
160 typedef struct BDRVRawReopenState {
161 int fd;
162 int open_flags;
163 } BDRVRawReopenState;
165 static int fd_open(BlockDriverState *bs);
166 static int64_t raw_getlength(BlockDriverState *bs);
168 typedef struct RawPosixAIOData {
169 BlockDriverState *bs;
170 int aio_fildes;
171 union {
172 struct iovec *aio_iov;
173 void *aio_ioctl_buf;
175 int aio_niov;
176 uint64_t aio_nbytes;
177 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
178 off_t aio_offset;
179 int aio_type;
180 } RawPosixAIOData;
182 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
183 static int cdrom_reopen(BlockDriverState *bs);
184 #endif
186 #if defined(__NetBSD__)
187 static int raw_normalize_devicepath(const char **filename)
189 static char namebuf[PATH_MAX];
190 const char *dp, *fname;
191 struct stat sb;
193 fname = *filename;
194 dp = strrchr(fname, '/');
195 if (lstat(fname, &sb) < 0) {
196 fprintf(stderr, "%s: stat failed: %s\n",
197 fname, strerror(errno));
198 return -errno;
201 if (!S_ISBLK(sb.st_mode)) {
202 return 0;
205 if (dp == NULL) {
206 snprintf(namebuf, PATH_MAX, "r%s", fname);
207 } else {
208 snprintf(namebuf, PATH_MAX, "%.*s/r%s",
209 (int)(dp - fname), fname, dp + 1);
211 fprintf(stderr, "%s is a block device", fname);
212 *filename = namebuf;
213 fprintf(stderr, ", using %s\n", *filename);
215 return 0;
217 #else
218 static int raw_normalize_devicepath(const char **filename)
220 return 0;
222 #endif
225 * Get logical block size via ioctl. On success store it in @sector_size_p.
227 static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
229 unsigned int sector_size;
230 bool success = false;
231 int i;
233 errno = ENOTSUP;
234 static const unsigned long ioctl_list[] = {
235 #ifdef BLKSSZGET
236 BLKSSZGET,
237 #endif
238 #ifdef DKIOCGETBLOCKSIZE
239 DKIOCGETBLOCKSIZE,
240 #endif
241 #ifdef DIOCGSECTORSIZE
242 DIOCGSECTORSIZE,
243 #endif
246 /* Try a few ioctls to get the right size */
247 for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) {
248 if (ioctl(fd, ioctl_list[i], &sector_size) >= 0) {
249 *sector_size_p = sector_size;
250 success = true;
254 return success ? 0 : -errno;
258 * Get physical block size of @fd.
259 * On success, store it in @blk_size and return 0.
260 * On failure, return -errno.
262 static int probe_physical_blocksize(int fd, unsigned int *blk_size)
264 #ifdef BLKPBSZGET
265 if (ioctl(fd, BLKPBSZGET, blk_size) < 0) {
266 return -errno;
268 return 0;
269 #else
270 return -ENOTSUP;
271 #endif
274 /* Check if read is allowed with given memory buffer and length.
276 * This function is used to check O_DIRECT memory buffer and request alignment.
278 static bool raw_is_io_aligned(int fd, void *buf, size_t len)
280 ssize_t ret = pread(fd, buf, len, 0);
282 if (ret >= 0) {
283 return true;
286 #ifdef __linux__
287 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
288 * other errors (e.g. real I/O error), which could happen on a failed
289 * drive, since we only care about probing alignment.
291 if (errno != EINVAL) {
292 return true;
294 #endif
296 return false;
299 static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
301 BDRVRawState *s = bs->opaque;
302 char *buf;
303 size_t max_align = MAX(MAX_BLOCKSIZE, getpagesize());
305 /* For SCSI generic devices the alignment is not really used.
306 With buffered I/O, we don't have any restrictions. */
307 if (bdrv_is_sg(bs) || !s->needs_alignment) {
308 bs->bl.request_alignment = 1;
309 s->buf_align = 1;
310 return;
313 bs->bl.request_alignment = 0;
314 s->buf_align = 0;
315 /* Let's try to use the logical blocksize for the alignment. */
316 if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) {
317 bs->bl.request_alignment = 0;
319 #ifdef CONFIG_XFS
320 if (s->is_xfs) {
321 struct dioattr da;
322 if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
323 bs->bl.request_alignment = da.d_miniosz;
324 /* The kernel returns wrong information for d_mem */
325 /* s->buf_align = da.d_mem; */
328 #endif
330 /* If we could not get the sizes so far, we can only guess them */
331 if (!s->buf_align) {
332 size_t align;
333 buf = qemu_memalign(max_align, 2 * max_align);
334 for (align = 512; align <= max_align; align <<= 1) {
335 if (raw_is_io_aligned(fd, buf + align, max_align)) {
336 s->buf_align = align;
337 break;
340 qemu_vfree(buf);
343 if (!bs->bl.request_alignment) {
344 size_t align;
345 buf = qemu_memalign(s->buf_align, max_align);
346 for (align = 512; align <= max_align; align <<= 1) {
347 if (raw_is_io_aligned(fd, buf, align)) {
348 bs->bl.request_alignment = align;
349 break;
352 qemu_vfree(buf);
355 if (!s->buf_align || !bs->bl.request_alignment) {
356 error_setg(errp, "Could not find working O_DIRECT alignment");
357 error_append_hint(errp, "Try cache.direct=off\n");
361 static void raw_parse_flags(int bdrv_flags, int *open_flags)
363 assert(open_flags != NULL);
365 *open_flags |= O_BINARY;
366 *open_flags &= ~O_ACCMODE;
367 if (bdrv_flags & BDRV_O_RDWR) {
368 *open_flags |= O_RDWR;
369 } else {
370 *open_flags |= O_RDONLY;
373 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
374 * and O_DIRECT for no caching. */
375 if ((bdrv_flags & BDRV_O_NOCACHE)) {
376 *open_flags |= O_DIRECT;
380 static void raw_parse_filename(const char *filename, QDict *options,
381 Error **errp)
383 bdrv_parse_filename_strip_prefix(filename, "file:", options);
386 static QemuOptsList raw_runtime_opts = {
387 .name = "raw",
388 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
389 .desc = {
391 .name = "filename",
392 .type = QEMU_OPT_STRING,
393 .help = "File name of the image",
396 .name = "aio",
397 .type = QEMU_OPT_STRING,
398 .help = "host AIO implementation (threads, native)",
401 .name = "locking",
402 .type = QEMU_OPT_STRING,
403 .help = "file locking mode (on/off/auto, default: auto)",
405 { /* end of list */ }
409 static int raw_open_common(BlockDriverState *bs, QDict *options,
410 int bdrv_flags, int open_flags, Error **errp)
412 BDRVRawState *s = bs->opaque;
413 QemuOpts *opts;
414 Error *local_err = NULL;
415 const char *filename = NULL;
416 BlockdevAioOptions aio, aio_default;
417 int fd, ret;
418 struct stat st;
419 OnOffAuto locking;
421 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
422 qemu_opts_absorb_qdict(opts, options, &local_err);
423 if (local_err) {
424 error_propagate(errp, local_err);
425 ret = -EINVAL;
426 goto fail;
429 filename = qemu_opt_get(opts, "filename");
431 ret = raw_normalize_devicepath(&filename);
432 if (ret != 0) {
433 error_setg_errno(errp, -ret, "Could not normalize device path");
434 goto fail;
437 aio_default = (bdrv_flags & BDRV_O_NATIVE_AIO)
438 ? BLOCKDEV_AIO_OPTIONS_NATIVE
439 : BLOCKDEV_AIO_OPTIONS_THREADS;
440 aio = qapi_enum_parse(&BlockdevAioOptions_lookup,
441 qemu_opt_get(opts, "aio"),
442 aio_default, &local_err);
443 if (local_err) {
444 error_propagate(errp, local_err);
445 ret = -EINVAL;
446 goto fail;
448 s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE);
450 locking = qapi_enum_parse(&OnOffAuto_lookup,
451 qemu_opt_get(opts, "locking"),
452 ON_OFF_AUTO_AUTO, &local_err);
453 if (local_err) {
454 error_propagate(errp, local_err);
455 ret = -EINVAL;
456 goto fail;
458 switch (locking) {
459 case ON_OFF_AUTO_ON:
460 s->use_lock = true;
461 if (!qemu_has_ofd_lock()) {
462 fprintf(stderr,
463 "File lock requested but OFD locking syscall is "
464 "unavailable, falling back to POSIX file locks.\n"
465 "Due to the implementation, locks can be lost "
466 "unexpectedly.\n");
468 break;
469 case ON_OFF_AUTO_OFF:
470 s->use_lock = false;
471 break;
472 case ON_OFF_AUTO_AUTO:
473 s->use_lock = qemu_has_ofd_lock();
474 break;
475 default:
476 abort();
479 s->open_flags = open_flags;
480 raw_parse_flags(bdrv_flags, &s->open_flags);
482 s->fd = -1;
483 fd = qemu_open(filename, s->open_flags, 0644);
484 if (fd < 0) {
485 ret = -errno;
486 error_setg_errno(errp, errno, "Could not open '%s'", filename);
487 if (ret == -EROFS) {
488 ret = -EACCES;
490 goto fail;
492 s->fd = fd;
494 s->lock_fd = -1;
495 if (s->use_lock) {
496 fd = qemu_open(filename, s->open_flags);
497 if (fd < 0) {
498 ret = -errno;
499 error_setg_errno(errp, errno, "Could not open '%s' for locking",
500 filename);
501 qemu_close(s->fd);
502 goto fail;
504 s->lock_fd = fd;
506 s->perm = 0;
507 s->shared_perm = BLK_PERM_ALL;
509 #ifdef CONFIG_LINUX_AIO
510 /* Currently Linux does AIO only for files opened with O_DIRECT */
511 if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) {
512 error_setg(errp, "aio=native was specified, but it requires "
513 "cache.direct=on, which was not specified.");
514 ret = -EINVAL;
515 goto fail;
517 #else
518 if (s->use_linux_aio) {
519 error_setg(errp, "aio=native was specified, but is not supported "
520 "in this build.");
521 ret = -EINVAL;
522 goto fail;
524 #endif /* !defined(CONFIG_LINUX_AIO) */
526 s->has_discard = true;
527 s->has_write_zeroes = true;
528 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
529 if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
530 s->needs_alignment = true;
533 if (fstat(s->fd, &st) < 0) {
534 ret = -errno;
535 error_setg_errno(errp, errno, "Could not stat file");
536 goto fail;
538 if (S_ISREG(st.st_mode)) {
539 s->discard_zeroes = true;
540 s->has_fallocate = true;
542 if (S_ISBLK(st.st_mode)) {
543 #ifdef BLKDISCARDZEROES
544 unsigned int arg;
545 if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
546 s->discard_zeroes = true;
548 #endif
549 #ifdef __linux__
550 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
551 * not rely on the contents of discarded blocks unless using O_DIRECT.
552 * Same for BLKZEROOUT.
554 if (!(bs->open_flags & BDRV_O_NOCACHE)) {
555 s->discard_zeroes = false;
556 s->has_write_zeroes = false;
558 #endif
560 #ifdef __FreeBSD__
561 if (S_ISCHR(st.st_mode)) {
563 * The file is a char device (disk), which on FreeBSD isn't behind
564 * a pager, so force all requests to be aligned. This is needed
565 * so QEMU makes sure all IO operations on the device are aligned
566 * to sector size, or else FreeBSD will reject them with EINVAL.
568 s->needs_alignment = true;
570 #endif
572 #ifdef CONFIG_XFS
573 if (platform_test_xfs_fd(s->fd)) {
574 s->is_xfs = true;
576 #endif
578 ret = 0;
579 fail:
580 if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
581 unlink(filename);
583 qemu_opts_del(opts);
584 return ret;
587 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
588 Error **errp)
590 BDRVRawState *s = bs->opaque;
592 s->type = FTYPE_FILE;
593 return raw_open_common(bs, options, flags, 0, errp);
596 typedef enum {
597 RAW_PL_PREPARE,
598 RAW_PL_COMMIT,
599 RAW_PL_ABORT,
600 } RawPermLockOp;
602 #define PERM_FOREACH(i) \
603 for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++)
605 /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the
606 * file; if @unlock == true, also unlock the unneeded bytes.
607 * @shared_perm_lock_bits is the mask of all permissions that are NOT shared.
609 static int raw_apply_lock_bytes(BDRVRawState *s,
610 uint64_t perm_lock_bits,
611 uint64_t shared_perm_lock_bits,
612 bool unlock, Error **errp)
614 int ret;
615 int i;
617 PERM_FOREACH(i) {
618 int off = RAW_LOCK_PERM_BASE + i;
619 if (perm_lock_bits & (1ULL << i)) {
620 ret = qemu_lock_fd(s->lock_fd, off, 1, false);
621 if (ret) {
622 error_setg(errp, "Failed to lock byte %d", off);
623 return ret;
625 } else if (unlock) {
626 ret = qemu_unlock_fd(s->lock_fd, off, 1);
627 if (ret) {
628 error_setg(errp, "Failed to unlock byte %d", off);
629 return ret;
633 PERM_FOREACH(i) {
634 int off = RAW_LOCK_SHARED_BASE + i;
635 if (shared_perm_lock_bits & (1ULL << i)) {
636 ret = qemu_lock_fd(s->lock_fd, off, 1, false);
637 if (ret) {
638 error_setg(errp, "Failed to lock byte %d", off);
639 return ret;
641 } else if (unlock) {
642 ret = qemu_unlock_fd(s->lock_fd, off, 1);
643 if (ret) {
644 error_setg(errp, "Failed to unlock byte %d", off);
645 return ret;
649 return 0;
652 /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */
653 static int raw_check_lock_bytes(BDRVRawState *s,
654 uint64_t perm, uint64_t shared_perm,
655 Error **errp)
657 int ret;
658 int i;
660 PERM_FOREACH(i) {
661 int off = RAW_LOCK_SHARED_BASE + i;
662 uint64_t p = 1ULL << i;
663 if (perm & p) {
664 ret = qemu_lock_fd_test(s->lock_fd, off, 1, true);
665 if (ret) {
666 char *perm_name = bdrv_perm_names(p);
667 error_setg(errp,
668 "Failed to get \"%s\" lock",
669 perm_name);
670 g_free(perm_name);
671 error_append_hint(errp,
672 "Is another process using the image?\n");
673 return ret;
677 PERM_FOREACH(i) {
678 int off = RAW_LOCK_PERM_BASE + i;
679 uint64_t p = 1ULL << i;
680 if (!(shared_perm & p)) {
681 ret = qemu_lock_fd_test(s->lock_fd, off, 1, true);
682 if (ret) {
683 char *perm_name = bdrv_perm_names(p);
684 error_setg(errp,
685 "Failed to get shared \"%s\" lock",
686 perm_name);
687 g_free(perm_name);
688 error_append_hint(errp,
689 "Is another process using the image?\n");
690 return ret;
694 return 0;
697 static int raw_handle_perm_lock(BlockDriverState *bs,
698 RawPermLockOp op,
699 uint64_t new_perm, uint64_t new_shared,
700 Error **errp)
702 BDRVRawState *s = bs->opaque;
703 int ret = 0;
704 Error *local_err = NULL;
706 if (!s->use_lock) {
707 return 0;
710 if (bdrv_get_flags(bs) & BDRV_O_INACTIVE) {
711 return 0;
714 assert(s->lock_fd > 0);
716 switch (op) {
717 case RAW_PL_PREPARE:
718 ret = raw_apply_lock_bytes(s, s->perm | new_perm,
719 ~s->shared_perm | ~new_shared,
720 false, errp);
721 if (!ret) {
722 ret = raw_check_lock_bytes(s, new_perm, new_shared, errp);
723 if (!ret) {
724 return 0;
727 op = RAW_PL_ABORT;
728 /* fall through to unlock bytes. */
729 case RAW_PL_ABORT:
730 raw_apply_lock_bytes(s, s->perm, ~s->shared_perm, true, &local_err);
731 if (local_err) {
732 /* Theoretically the above call only unlocks bytes and it cannot
733 * fail. Something weird happened, report it.
735 error_report_err(local_err);
737 break;
738 case RAW_PL_COMMIT:
739 raw_apply_lock_bytes(s, new_perm, ~new_shared, true, &local_err);
740 if (local_err) {
741 /* Theoretically the above call only unlocks bytes and it cannot
742 * fail. Something weird happened, report it.
744 error_report_err(local_err);
746 break;
748 return ret;
751 static int raw_reopen_prepare(BDRVReopenState *state,
752 BlockReopenQueue *queue, Error **errp)
754 BDRVRawState *s;
755 BDRVRawReopenState *rs;
756 int ret = 0;
757 Error *local_err = NULL;
759 assert(state != NULL);
760 assert(state->bs != NULL);
762 s = state->bs->opaque;
764 state->opaque = g_new0(BDRVRawReopenState, 1);
765 rs = state->opaque;
767 if (s->type == FTYPE_CD) {
768 rs->open_flags |= O_NONBLOCK;
771 raw_parse_flags(state->flags, &rs->open_flags);
773 rs->fd = -1;
775 int fcntl_flags = O_APPEND | O_NONBLOCK;
776 #ifdef O_NOATIME
777 fcntl_flags |= O_NOATIME;
778 #endif
780 #ifdef O_ASYNC
781 /* Not all operating systems have O_ASYNC, and those that don't
782 * will not let us track the state into rs->open_flags (typically
783 * you achieve the same effect with an ioctl, for example I_SETSIG
784 * on Solaris). But we do not use O_ASYNC, so that's fine.
786 assert((s->open_flags & O_ASYNC) == 0);
787 #endif
789 if ((rs->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
790 /* dup the original fd */
791 rs->fd = qemu_dup(s->fd);
792 if (rs->fd >= 0) {
793 ret = fcntl_setfl(rs->fd, rs->open_flags);
794 if (ret) {
795 qemu_close(rs->fd);
796 rs->fd = -1;
801 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
802 if (rs->fd == -1) {
803 const char *normalized_filename = state->bs->filename;
804 ret = raw_normalize_devicepath(&normalized_filename);
805 if (ret < 0) {
806 error_setg_errno(errp, -ret, "Could not normalize device path");
807 } else {
808 assert(!(rs->open_flags & O_CREAT));
809 rs->fd = qemu_open(normalized_filename, rs->open_flags);
810 if (rs->fd == -1) {
811 error_setg_errno(errp, errno, "Could not reopen file");
812 ret = -1;
817 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
818 * alignment with the new fd. */
819 if (rs->fd != -1) {
820 raw_probe_alignment(state->bs, rs->fd, &local_err);
821 if (local_err) {
822 qemu_close(rs->fd);
823 rs->fd = -1;
824 error_propagate(errp, local_err);
825 ret = -EINVAL;
829 return ret;
832 static void raw_reopen_commit(BDRVReopenState *state)
834 BDRVRawReopenState *rs = state->opaque;
835 BDRVRawState *s = state->bs->opaque;
837 s->open_flags = rs->open_flags;
839 qemu_close(s->fd);
840 s->fd = rs->fd;
842 g_free(state->opaque);
843 state->opaque = NULL;
847 static void raw_reopen_abort(BDRVReopenState *state)
849 BDRVRawReopenState *rs = state->opaque;
851 /* nothing to do if NULL, we didn't get far enough */
852 if (rs == NULL) {
853 return;
856 if (rs->fd >= 0) {
857 qemu_close(rs->fd);
858 rs->fd = -1;
860 g_free(state->opaque);
861 state->opaque = NULL;
864 static int hdev_get_max_transfer_length(BlockDriverState *bs, int fd)
866 #ifdef BLKSECTGET
867 int max_bytes = 0;
868 short max_sectors = 0;
869 if (bs->sg && ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
870 return max_bytes;
871 } else if (!bs->sg && ioctl(fd, BLKSECTGET, &max_sectors) == 0) {
872 return max_sectors << BDRV_SECTOR_BITS;
873 } else {
874 return -errno;
876 #else
877 return -ENOSYS;
878 #endif
881 static int hdev_get_max_segments(const struct stat *st)
883 #ifdef CONFIG_LINUX
884 char buf[32];
885 const char *end;
886 char *sysfspath;
887 int ret;
888 int fd = -1;
889 long max_segments;
891 sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
892 major(st->st_rdev), minor(st->st_rdev));
893 fd = open(sysfspath, O_RDONLY);
894 if (fd == -1) {
895 ret = -errno;
896 goto out;
898 do {
899 ret = read(fd, buf, sizeof(buf) - 1);
900 } while (ret == -1 && errno == EINTR);
901 if (ret < 0) {
902 ret = -errno;
903 goto out;
904 } else if (ret == 0) {
905 ret = -EIO;
906 goto out;
908 buf[ret] = 0;
909 /* The file is ended with '\n', pass 'end' to accept that. */
910 ret = qemu_strtol(buf, &end, 10, &max_segments);
911 if (ret == 0 && end && *end == '\n') {
912 ret = max_segments;
915 out:
916 if (fd != -1) {
917 close(fd);
919 g_free(sysfspath);
920 return ret;
921 #else
922 return -ENOTSUP;
923 #endif
926 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
928 BDRVRawState *s = bs->opaque;
929 struct stat st;
931 if (!fstat(s->fd, &st)) {
932 if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) {
933 int ret = hdev_get_max_transfer_length(bs, s->fd);
934 if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
935 bs->bl.max_transfer = pow2floor(ret);
937 ret = hdev_get_max_segments(&st);
938 if (ret > 0) {
939 bs->bl.max_transfer = MIN(bs->bl.max_transfer,
940 ret * getpagesize());
945 raw_probe_alignment(bs, s->fd, errp);
946 bs->bl.min_mem_alignment = s->buf_align;
947 bs->bl.opt_mem_alignment = MAX(s->buf_align, getpagesize());
950 static int check_for_dasd(int fd)
952 #ifdef BIODASDINFO2
953 struct dasd_information2_t info = {0};
955 return ioctl(fd, BIODASDINFO2, &info);
956 #else
957 return -1;
958 #endif
962 * Try to get @bs's logical and physical block size.
963 * On success, store them in @bsz and return zero.
964 * On failure, return negative errno.
966 static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
968 BDRVRawState *s = bs->opaque;
969 int ret;
971 /* If DASD, get blocksizes */
972 if (check_for_dasd(s->fd) < 0) {
973 return -ENOTSUP;
975 ret = probe_logical_blocksize(s->fd, &bsz->log);
976 if (ret < 0) {
977 return ret;
979 return probe_physical_blocksize(s->fd, &bsz->phys);
983 * Try to get @bs's geometry: cyls, heads, sectors.
984 * On success, store them in @geo and return 0.
985 * On failure return -errno.
986 * (Allows block driver to assign default geometry values that guest sees)
988 #ifdef __linux__
989 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
991 BDRVRawState *s = bs->opaque;
992 struct hd_geometry ioctl_geo = {0};
994 /* If DASD, get its geometry */
995 if (check_for_dasd(s->fd) < 0) {
996 return -ENOTSUP;
998 if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) {
999 return -errno;
1001 /* HDIO_GETGEO may return success even though geo contains zeros
1002 (e.g. certain multipath setups) */
1003 if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) {
1004 return -ENOTSUP;
1006 /* Do not return a geometry for partition */
1007 if (ioctl_geo.start != 0) {
1008 return -ENOTSUP;
1010 geo->heads = ioctl_geo.heads;
1011 geo->sectors = ioctl_geo.sectors;
1012 geo->cylinders = ioctl_geo.cylinders;
1014 return 0;
1016 #else /* __linux__ */
1017 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
1019 return -ENOTSUP;
1021 #endif
1023 static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
1025 int ret;
1027 ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
1028 if (ret == -1) {
1029 return -errno;
1032 return 0;
1035 static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
1037 BDRVRawState *s = aiocb->bs->opaque;
1038 int ret;
1040 if (s->page_cache_inconsistent) {
1041 return -EIO;
1044 ret = qemu_fdatasync(aiocb->aio_fildes);
1045 if (ret == -1) {
1046 /* There is no clear definition of the semantics of a failing fsync(),
1047 * so we may have to assume the worst. The sad truth is that this
1048 * assumption is correct for Linux. Some pages are now probably marked
1049 * clean in the page cache even though they are inconsistent with the
1050 * on-disk contents. The next fdatasync() call would succeed, but no
1051 * further writeback attempt will be made. We can't get back to a state
1052 * in which we know what is on disk (we would have to rewrite
1053 * everything that was touched since the last fdatasync() at least), so
1054 * make bdrv_flush() fail permanently. Given that the behaviour isn't
1055 * really defined, I have little hope that other OSes are doing better.
1057 * Obviously, this doesn't affect O_DIRECT, which bypasses the page
1058 * cache. */
1059 if ((s->open_flags & O_DIRECT) == 0) {
1060 s->page_cache_inconsistent = true;
1062 return -errno;
1064 return 0;
1067 #ifdef CONFIG_PREADV
1069 static bool preadv_present = true;
1071 static ssize_t
1072 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
1074 return preadv(fd, iov, nr_iov, offset);
1077 static ssize_t
1078 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
1080 return pwritev(fd, iov, nr_iov, offset);
1083 #else
1085 static bool preadv_present = false;
1087 static ssize_t
1088 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
1090 return -ENOSYS;
1093 static ssize_t
1094 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
1096 return -ENOSYS;
1099 #endif
1101 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
1103 ssize_t len;
1105 do {
1106 if (aiocb->aio_type & QEMU_AIO_WRITE)
1107 len = qemu_pwritev(aiocb->aio_fildes,
1108 aiocb->aio_iov,
1109 aiocb->aio_niov,
1110 aiocb->aio_offset);
1111 else
1112 len = qemu_preadv(aiocb->aio_fildes,
1113 aiocb->aio_iov,
1114 aiocb->aio_niov,
1115 aiocb->aio_offset);
1116 } while (len == -1 && errno == EINTR);
1118 if (len == -1) {
1119 return -errno;
1121 return len;
1125 * Read/writes the data to/from a given linear buffer.
1127 * Returns the number of bytes handles or -errno in case of an error. Short
1128 * reads are only returned if the end of the file is reached.
1130 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
1132 ssize_t offset = 0;
1133 ssize_t len;
1135 while (offset < aiocb->aio_nbytes) {
1136 if (aiocb->aio_type & QEMU_AIO_WRITE) {
1137 len = pwrite(aiocb->aio_fildes,
1138 (const char *)buf + offset,
1139 aiocb->aio_nbytes - offset,
1140 aiocb->aio_offset + offset);
1141 } else {
1142 len = pread(aiocb->aio_fildes,
1143 buf + offset,
1144 aiocb->aio_nbytes - offset,
1145 aiocb->aio_offset + offset);
1147 if (len == -1 && errno == EINTR) {
1148 continue;
1149 } else if (len == -1 && errno == EINVAL &&
1150 (aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
1151 !(aiocb->aio_type & QEMU_AIO_WRITE) &&
1152 offset > 0) {
1153 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
1154 * after a short read. Assume that O_DIRECT short reads only occur
1155 * at EOF. Therefore this is a short read, not an I/O error.
1157 break;
1158 } else if (len == -1) {
1159 offset = -errno;
1160 break;
1161 } else if (len == 0) {
1162 break;
1164 offset += len;
1167 return offset;
1170 static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
1172 ssize_t nbytes;
1173 char *buf;
1175 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
1177 * If there is just a single buffer, and it is properly aligned
1178 * we can just use plain pread/pwrite without any problems.
1180 if (aiocb->aio_niov == 1) {
1181 return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
1184 * We have more than one iovec, and all are properly aligned.
1186 * Try preadv/pwritev first and fall back to linearizing the
1187 * buffer if it's not supported.
1189 if (preadv_present) {
1190 nbytes = handle_aiocb_rw_vector(aiocb);
1191 if (nbytes == aiocb->aio_nbytes ||
1192 (nbytes < 0 && nbytes != -ENOSYS)) {
1193 return nbytes;
1195 preadv_present = false;
1199 * XXX(hch): short read/write. no easy way to handle the reminder
1200 * using these interfaces. For now retry using plain
1201 * pread/pwrite?
1206 * Ok, we have to do it the hard way, copy all segments into
1207 * a single aligned buffer.
1209 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
1210 if (buf == NULL) {
1211 return -ENOMEM;
1214 if (aiocb->aio_type & QEMU_AIO_WRITE) {
1215 char *p = buf;
1216 int i;
1218 for (i = 0; i < aiocb->aio_niov; ++i) {
1219 memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
1220 p += aiocb->aio_iov[i].iov_len;
1222 assert(p - buf == aiocb->aio_nbytes);
1225 nbytes = handle_aiocb_rw_linear(aiocb, buf);
1226 if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
1227 char *p = buf;
1228 size_t count = aiocb->aio_nbytes, copy;
1229 int i;
1231 for (i = 0; i < aiocb->aio_niov && count; ++i) {
1232 copy = count;
1233 if (copy > aiocb->aio_iov[i].iov_len) {
1234 copy = aiocb->aio_iov[i].iov_len;
1236 memcpy(aiocb->aio_iov[i].iov_base, p, copy);
1237 assert(count >= copy);
1238 p += copy;
1239 count -= copy;
1241 assert(count == 0);
1243 qemu_vfree(buf);
1245 return nbytes;
1248 #ifdef CONFIG_XFS
1249 static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
1251 struct xfs_flock64 fl;
1252 int err;
1254 memset(&fl, 0, sizeof(fl));
1255 fl.l_whence = SEEK_SET;
1256 fl.l_start = offset;
1257 fl.l_len = bytes;
1259 if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
1260 err = errno;
1261 DPRINTF("cannot write zero range (%s)\n", strerror(errno));
1262 return -err;
1265 return 0;
1268 static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
1270 struct xfs_flock64 fl;
1271 int err;
1273 memset(&fl, 0, sizeof(fl));
1274 fl.l_whence = SEEK_SET;
1275 fl.l_start = offset;
1276 fl.l_len = bytes;
1278 if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
1279 err = errno;
1280 DPRINTF("cannot punch hole (%s)\n", strerror(errno));
1281 return -err;
1284 return 0;
1286 #endif
1288 static int translate_err(int err)
1290 if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP ||
1291 err == -ENOTTY) {
1292 err = -ENOTSUP;
1294 return err;
1297 #ifdef CONFIG_FALLOCATE
1298 static int do_fallocate(int fd, int mode, off_t offset, off_t len)
1300 do {
1301 if (fallocate(fd, mode, offset, len) == 0) {
1302 return 0;
1304 } while (errno == EINTR);
1305 return translate_err(-errno);
1307 #endif
1309 static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb)
1311 int ret = -ENOTSUP;
1312 BDRVRawState *s = aiocb->bs->opaque;
1314 if (!s->has_write_zeroes) {
1315 return -ENOTSUP;
1318 #ifdef BLKZEROOUT
1319 do {
1320 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
1321 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) {
1322 return 0;
1324 } while (errno == EINTR);
1326 ret = translate_err(-errno);
1327 #endif
1329 if (ret == -ENOTSUP) {
1330 s->has_write_zeroes = false;
1332 return ret;
1335 static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
1337 #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
1338 BDRVRawState *s = aiocb->bs->opaque;
1339 #endif
1340 #ifdef CONFIG_FALLOCATE
1341 int64_t len;
1342 #endif
1344 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
1345 return handle_aiocb_write_zeroes_block(aiocb);
1348 #ifdef CONFIG_XFS
1349 if (s->is_xfs) {
1350 return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
1352 #endif
1354 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1355 if (s->has_write_zeroes) {
1356 int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE,
1357 aiocb->aio_offset, aiocb->aio_nbytes);
1358 if (ret == 0 || ret != -ENOTSUP) {
1359 return ret;
1361 s->has_write_zeroes = false;
1363 #endif
1365 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1366 if (s->has_discard && s->has_fallocate) {
1367 int ret = do_fallocate(s->fd,
1368 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1369 aiocb->aio_offset, aiocb->aio_nbytes);
1370 if (ret == 0) {
1371 ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
1372 if (ret == 0 || ret != -ENOTSUP) {
1373 return ret;
1375 s->has_fallocate = false;
1376 } else if (ret != -ENOTSUP) {
1377 return ret;
1378 } else {
1379 s->has_discard = false;
1382 #endif
1384 #ifdef CONFIG_FALLOCATE
1385 /* Last resort: we are trying to extend the file with zeroed data. This
1386 * can be done via fallocate(fd, 0) */
1387 len = bdrv_getlength(aiocb->bs);
1388 if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) {
1389 int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
1390 if (ret == 0 || ret != -ENOTSUP) {
1391 return ret;
1393 s->has_fallocate = false;
1395 #endif
1397 return -ENOTSUP;
1400 static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
1402 int ret = -EOPNOTSUPP;
1403 BDRVRawState *s = aiocb->bs->opaque;
1405 if (!s->has_discard) {
1406 return -ENOTSUP;
1409 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
1410 #ifdef BLKDISCARD
1411 do {
1412 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
1413 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
1414 return 0;
1416 } while (errno == EINTR);
1418 ret = -errno;
1419 #endif
1420 } else {
1421 #ifdef CONFIG_XFS
1422 if (s->is_xfs) {
1423 return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
1425 #endif
1427 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1428 ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1429 aiocb->aio_offset, aiocb->aio_nbytes);
1430 #endif
1433 ret = translate_err(ret);
1434 if (ret == -ENOTSUP) {
1435 s->has_discard = false;
1437 return ret;
1440 static int aio_worker(void *arg)
1442 RawPosixAIOData *aiocb = arg;
1443 ssize_t ret = 0;
1445 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
1446 case QEMU_AIO_READ:
1447 ret = handle_aiocb_rw(aiocb);
1448 if (ret >= 0 && ret < aiocb->aio_nbytes) {
1449 iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
1450 0, aiocb->aio_nbytes - ret);
1452 ret = aiocb->aio_nbytes;
1454 if (ret == aiocb->aio_nbytes) {
1455 ret = 0;
1456 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
1457 ret = -EINVAL;
1459 break;
1460 case QEMU_AIO_WRITE:
1461 ret = handle_aiocb_rw(aiocb);
1462 if (ret == aiocb->aio_nbytes) {
1463 ret = 0;
1464 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
1465 ret = -EINVAL;
1467 break;
1468 case QEMU_AIO_FLUSH:
1469 ret = handle_aiocb_flush(aiocb);
1470 break;
1471 case QEMU_AIO_IOCTL:
1472 ret = handle_aiocb_ioctl(aiocb);
1473 break;
1474 case QEMU_AIO_DISCARD:
1475 ret = handle_aiocb_discard(aiocb);
1476 break;
1477 case QEMU_AIO_WRITE_ZEROES:
1478 ret = handle_aiocb_write_zeroes(aiocb);
1479 break;
1480 default:
1481 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
1482 ret = -EINVAL;
1483 break;
1486 g_free(aiocb);
1487 return ret;
1490 static int paio_submit_co(BlockDriverState *bs, int fd,
1491 int64_t offset, QEMUIOVector *qiov,
1492 int bytes, int type)
1494 RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
1495 ThreadPool *pool;
1497 acb->bs = bs;
1498 acb->aio_type = type;
1499 acb->aio_fildes = fd;
1501 acb->aio_nbytes = bytes;
1502 acb->aio_offset = offset;
1504 if (qiov) {
1505 acb->aio_iov = qiov->iov;
1506 acb->aio_niov = qiov->niov;
1507 assert(qiov->size == bytes);
1510 trace_paio_submit_co(offset, bytes, type);
1511 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1512 return thread_pool_submit_co(pool, aio_worker, acb);
1515 static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd,
1516 int64_t offset, QEMUIOVector *qiov, int bytes,
1517 BlockCompletionFunc *cb, void *opaque, int type)
1519 RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
1520 ThreadPool *pool;
1522 acb->bs = bs;
1523 acb->aio_type = type;
1524 acb->aio_fildes = fd;
1526 acb->aio_nbytes = bytes;
1527 acb->aio_offset = offset;
1529 if (qiov) {
1530 acb->aio_iov = qiov->iov;
1531 acb->aio_niov = qiov->niov;
1532 assert(qiov->size == acb->aio_nbytes);
1535 trace_paio_submit(acb, opaque, offset, bytes, type);
1536 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1537 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
1540 static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset,
1541 uint64_t bytes, QEMUIOVector *qiov, int type)
1543 BDRVRawState *s = bs->opaque;
1545 if (fd_open(bs) < 0)
1546 return -EIO;
1549 * Check if the underlying device requires requests to be aligned,
1550 * and if the request we are trying to submit is aligned or not.
1551 * If this is the case tell the low-level driver that it needs
1552 * to copy the buffer.
1554 if (s->needs_alignment) {
1555 if (!bdrv_qiov_is_aligned(bs, qiov)) {
1556 type |= QEMU_AIO_MISALIGNED;
1557 #ifdef CONFIG_LINUX_AIO
1558 } else if (s->use_linux_aio) {
1559 LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
1560 assert(qiov->size == bytes);
1561 return laio_co_submit(bs, aio, s->fd, offset, qiov, type);
1562 #endif
1566 return paio_submit_co(bs, s->fd, offset, qiov, bytes, type);
1569 static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
1570 uint64_t bytes, QEMUIOVector *qiov,
1571 int flags)
1573 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ);
1576 static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset,
1577 uint64_t bytes, QEMUIOVector *qiov,
1578 int flags)
1580 assert(flags == 0);
1581 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE);
1584 static void raw_aio_plug(BlockDriverState *bs)
1586 #ifdef CONFIG_LINUX_AIO
1587 BDRVRawState *s = bs->opaque;
1588 if (s->use_linux_aio) {
1589 LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
1590 laio_io_plug(bs, aio);
1592 #endif
1595 static void raw_aio_unplug(BlockDriverState *bs)
1597 #ifdef CONFIG_LINUX_AIO
1598 BDRVRawState *s = bs->opaque;
1599 if (s->use_linux_aio) {
1600 LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
1601 laio_io_unplug(bs, aio);
1603 #endif
1606 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
1607 BlockCompletionFunc *cb, void *opaque)
1609 BDRVRawState *s = bs->opaque;
1611 if (fd_open(bs) < 0)
1612 return NULL;
1614 return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
1617 static void raw_close(BlockDriverState *bs)
1619 BDRVRawState *s = bs->opaque;
1621 if (s->fd >= 0) {
1622 qemu_close(s->fd);
1623 s->fd = -1;
1625 if (s->lock_fd >= 0) {
1626 qemu_close(s->lock_fd);
1627 s->lock_fd = -1;
1632 * Truncates the given regular file @fd to @offset and, when growing, fills the
1633 * new space according to @prealloc.
1635 * Returns: 0 on success, -errno on failure.
1637 static int raw_regular_truncate(int fd, int64_t offset, PreallocMode prealloc,
1638 Error **errp)
1640 int result = 0;
1641 int64_t current_length = 0;
1642 char *buf = NULL;
1643 struct stat st;
1645 if (fstat(fd, &st) < 0) {
1646 result = -errno;
1647 error_setg_errno(errp, -result, "Could not stat file");
1648 return result;
1651 current_length = st.st_size;
1652 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
1653 error_setg(errp, "Cannot use preallocation for shrinking files");
1654 return -ENOTSUP;
1657 switch (prealloc) {
1658 #ifdef CONFIG_POSIX_FALLOCATE
1659 case PREALLOC_MODE_FALLOC:
1661 * Truncating before posix_fallocate() makes it about twice slower on
1662 * file systems that do not support fallocate(), trying to check if a
1663 * block is allocated before allocating it, so don't do that here.
1665 result = -posix_fallocate(fd, current_length, offset - current_length);
1666 if (result != 0) {
1667 /* posix_fallocate() doesn't set errno. */
1668 error_setg_errno(errp, -result,
1669 "Could not preallocate new data");
1671 goto out;
1672 #endif
1673 case PREALLOC_MODE_FULL:
1675 int64_t num = 0, left = offset - current_length;
1678 * Knowing the final size from the beginning could allow the file
1679 * system driver to do less allocations and possibly avoid
1680 * fragmentation of the file.
1682 if (ftruncate(fd, offset) != 0) {
1683 result = -errno;
1684 error_setg_errno(errp, -result, "Could not resize file");
1685 goto out;
1688 buf = g_malloc0(65536);
1690 result = lseek(fd, current_length, SEEK_SET);
1691 if (result < 0) {
1692 result = -errno;
1693 error_setg_errno(errp, -result,
1694 "Failed to seek to the old end of file");
1695 goto out;
1698 while (left > 0) {
1699 num = MIN(left, 65536);
1700 result = write(fd, buf, num);
1701 if (result < 0) {
1702 result = -errno;
1703 error_setg_errno(errp, -result,
1704 "Could not write zeros for preallocation");
1705 goto out;
1707 left -= result;
1709 if (result >= 0) {
1710 result = fsync(fd);
1711 if (result < 0) {
1712 result = -errno;
1713 error_setg_errno(errp, -result,
1714 "Could not flush file to disk");
1715 goto out;
1718 goto out;
1720 case PREALLOC_MODE_OFF:
1721 if (ftruncate(fd, offset) != 0) {
1722 result = -errno;
1723 error_setg_errno(errp, -result, "Could not resize file");
1725 return result;
1726 default:
1727 result = -ENOTSUP;
1728 error_setg(errp, "Unsupported preallocation mode: %s",
1729 PreallocMode_str(prealloc));
1730 return result;
1733 out:
1734 if (result < 0) {
1735 if (ftruncate(fd, current_length) < 0) {
1736 error_report("Failed to restore old file length: %s",
1737 strerror(errno));
1741 g_free(buf);
1742 return result;
1745 static int raw_truncate(BlockDriverState *bs, int64_t offset,
1746 PreallocMode prealloc, Error **errp)
1748 BDRVRawState *s = bs->opaque;
1749 struct stat st;
1750 int ret;
1752 if (fstat(s->fd, &st)) {
1753 ret = -errno;
1754 error_setg_errno(errp, -ret, "Failed to fstat() the file");
1755 return ret;
1758 if (S_ISREG(st.st_mode)) {
1759 return raw_regular_truncate(s->fd, offset, prealloc, errp);
1762 if (prealloc != PREALLOC_MODE_OFF) {
1763 error_setg(errp, "Preallocation mode '%s' unsupported for this "
1764 "non-regular file", PreallocMode_str(prealloc));
1765 return -ENOTSUP;
1768 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1769 if (offset > raw_getlength(bs)) {
1770 error_setg(errp, "Cannot grow device files");
1771 return -EINVAL;
1773 } else {
1774 error_setg(errp, "Resizing this file is not supported");
1775 return -ENOTSUP;
1778 return 0;
1781 #ifdef __OpenBSD__
1782 static int64_t raw_getlength(BlockDriverState *bs)
1784 BDRVRawState *s = bs->opaque;
1785 int fd = s->fd;
1786 struct stat st;
1788 if (fstat(fd, &st))
1789 return -errno;
1790 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1791 struct disklabel dl;
1793 if (ioctl(fd, DIOCGDINFO, &dl))
1794 return -errno;
1795 return (uint64_t)dl.d_secsize *
1796 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1797 } else
1798 return st.st_size;
1800 #elif defined(__NetBSD__)
1801 static int64_t raw_getlength(BlockDriverState *bs)
1803 BDRVRawState *s = bs->opaque;
1804 int fd = s->fd;
1805 struct stat st;
1807 if (fstat(fd, &st))
1808 return -errno;
1809 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1810 struct dkwedge_info dkw;
1812 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
1813 return dkw.dkw_size * 512;
1814 } else {
1815 struct disklabel dl;
1817 if (ioctl(fd, DIOCGDINFO, &dl))
1818 return -errno;
1819 return (uint64_t)dl.d_secsize *
1820 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1822 } else
1823 return st.st_size;
1825 #elif defined(__sun__)
1826 static int64_t raw_getlength(BlockDriverState *bs)
1828 BDRVRawState *s = bs->opaque;
1829 struct dk_minfo minfo;
1830 int ret;
1831 int64_t size;
1833 ret = fd_open(bs);
1834 if (ret < 0) {
1835 return ret;
1839 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1841 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
1842 if (ret != -1) {
1843 return minfo.dki_lbsize * minfo.dki_capacity;
1847 * There are reports that lseek on some devices fails, but
1848 * irc discussion said that contingency on contingency was overkill.
1850 size = lseek(s->fd, 0, SEEK_END);
1851 if (size < 0) {
1852 return -errno;
1854 return size;
1856 #elif defined(CONFIG_BSD)
1857 static int64_t raw_getlength(BlockDriverState *bs)
1859 BDRVRawState *s = bs->opaque;
1860 int fd = s->fd;
1861 int64_t size;
1862 struct stat sb;
1863 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1864 int reopened = 0;
1865 #endif
1866 int ret;
1868 ret = fd_open(bs);
1869 if (ret < 0)
1870 return ret;
1872 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1873 again:
1874 #endif
1875 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
1876 #ifdef DIOCGMEDIASIZE
1877 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
1878 #elif defined(DIOCGPART)
1880 struct partinfo pi;
1881 if (ioctl(fd, DIOCGPART, &pi) == 0)
1882 size = pi.media_size;
1883 else
1884 size = 0;
1886 if (size == 0)
1887 #endif
1888 #if defined(__APPLE__) && defined(__MACH__)
1890 uint64_t sectors = 0;
1891 uint32_t sector_size = 0;
1893 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &sectors) == 0
1894 && ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == 0) {
1895 size = sectors * sector_size;
1896 } else {
1897 size = lseek(fd, 0LL, SEEK_END);
1898 if (size < 0) {
1899 return -errno;
1903 #else
1904 size = lseek(fd, 0LL, SEEK_END);
1905 if (size < 0) {
1906 return -errno;
1908 #endif
1909 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1910 switch(s->type) {
1911 case FTYPE_CD:
1912 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1913 if (size == 2048LL * (unsigned)-1)
1914 size = 0;
1915 /* XXX no disc? maybe we need to reopen... */
1916 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
1917 reopened = 1;
1918 goto again;
1921 #endif
1922 } else {
1923 size = lseek(fd, 0, SEEK_END);
1924 if (size < 0) {
1925 return -errno;
1928 return size;
1930 #else
1931 static int64_t raw_getlength(BlockDriverState *bs)
1933 BDRVRawState *s = bs->opaque;
1934 int ret;
1935 int64_t size;
1937 ret = fd_open(bs);
1938 if (ret < 0) {
1939 return ret;
1942 size = lseek(s->fd, 0, SEEK_END);
1943 if (size < 0) {
1944 return -errno;
1946 return size;
1948 #endif
1950 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
1952 struct stat st;
1953 BDRVRawState *s = bs->opaque;
1955 if (fstat(s->fd, &st) < 0) {
1956 return -errno;
1958 return (int64_t)st.st_blocks * 512;
1961 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
1963 int fd;
1964 int result = 0;
1965 int64_t total_size = 0;
1966 bool nocow = false;
1967 PreallocMode prealloc;
1968 char *buf = NULL;
1969 Error *local_err = NULL;
1971 strstart(filename, "file:", &filename);
1973 /* Read out options */
1974 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1975 BDRV_SECTOR_SIZE);
1976 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
1977 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1978 prealloc = qapi_enum_parse(&PreallocMode_lookup, buf,
1979 PREALLOC_MODE_OFF, &local_err);
1980 g_free(buf);
1981 if (local_err) {
1982 error_propagate(errp, local_err);
1983 result = -EINVAL;
1984 goto out;
1987 fd = qemu_open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
1988 0644);
1989 if (fd < 0) {
1990 result = -errno;
1991 error_setg_errno(errp, -result, "Could not create file");
1992 goto out;
1995 if (nocow) {
1996 #ifdef __linux__
1997 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1998 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1999 * will be ignored since any failure of this operation should not
2000 * block the left work.
2002 int attr;
2003 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
2004 attr |= FS_NOCOW_FL;
2005 ioctl(fd, FS_IOC_SETFLAGS, &attr);
2007 #endif
2010 result = raw_regular_truncate(fd, total_size, prealloc, errp);
2011 if (result < 0) {
2012 goto out_close;
2015 out_close:
2016 if (qemu_close(fd) != 0 && result == 0) {
2017 result = -errno;
2018 error_setg_errno(errp, -result, "Could not close the new file");
2020 out:
2021 return result;
2025 * Find allocation range in @bs around offset @start.
2026 * May change underlying file descriptor's file offset.
2027 * If @start is not in a hole, store @start in @data, and the
2028 * beginning of the next hole in @hole, and return 0.
2029 * If @start is in a non-trailing hole, store @start in @hole and the
2030 * beginning of the next non-hole in @data, and return 0.
2031 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
2032 * If we can't find out, return a negative errno other than -ENXIO.
2034 static int find_allocation(BlockDriverState *bs, off_t start,
2035 off_t *data, off_t *hole)
2037 #if defined SEEK_HOLE && defined SEEK_DATA
2038 BDRVRawState *s = bs->opaque;
2039 off_t offs;
2042 * SEEK_DATA cases:
2043 * D1. offs == start: start is in data
2044 * D2. offs > start: start is in a hole, next data at offs
2045 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
2046 * or start is beyond EOF
2047 * If the latter happens, the file has been truncated behind
2048 * our back since we opened it. All bets are off then.
2049 * Treating like a trailing hole is simplest.
2050 * D4. offs < 0, errno != ENXIO: we learned nothing
2052 offs = lseek(s->fd, start, SEEK_DATA);
2053 if (offs < 0) {
2054 return -errno; /* D3 or D4 */
2056 assert(offs >= start);
2058 if (offs > start) {
2059 /* D2: in hole, next data at offs */
2060 *hole = start;
2061 *data = offs;
2062 return 0;
2065 /* D1: in data, end not yet known */
2068 * SEEK_HOLE cases:
2069 * H1. offs == start: start is in a hole
2070 * If this happens here, a hole has been dug behind our back
2071 * since the previous lseek().
2072 * H2. offs > start: either start is in data, next hole at offs,
2073 * or start is in trailing hole, EOF at offs
2074 * Linux treats trailing holes like any other hole: offs ==
2075 * start. Solaris seeks to EOF instead: offs > start (blech).
2076 * If that happens here, a hole has been dug behind our back
2077 * since the previous lseek().
2078 * H3. offs < 0, errno = ENXIO: start is beyond EOF
2079 * If this happens, the file has been truncated behind our
2080 * back since we opened it. Treat it like a trailing hole.
2081 * H4. offs < 0, errno != ENXIO: we learned nothing
2082 * Pretend we know nothing at all, i.e. "forget" about D1.
2084 offs = lseek(s->fd, start, SEEK_HOLE);
2085 if (offs < 0) {
2086 return -errno; /* D1 and (H3 or H4) */
2088 assert(offs >= start);
2090 if (offs > start) {
2092 * D1 and H2: either in data, next hole at offs, or it was in
2093 * data but is now in a trailing hole. In the latter case,
2094 * all bets are off. Treating it as if it there was data all
2095 * the way to EOF is safe, so simply do that.
2097 *data = start;
2098 *hole = offs;
2099 return 0;
2102 /* D1 and H1 */
2103 return -EBUSY;
2104 #else
2105 return -ENOTSUP;
2106 #endif
2110 * Returns the allocation status of the specified sectors.
2112 * If 'sector_num' is beyond the end of the disk image the return value is 0
2113 * and 'pnum' is set to 0.
2115 * 'pnum' is set to the number of sectors (including and immediately following
2116 * the specified sector) that are known to be in the same
2117 * allocated/unallocated state.
2119 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
2120 * beyond the end of the disk image it will be clamped.
2122 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
2123 int64_t sector_num,
2124 int nb_sectors, int *pnum,
2125 BlockDriverState **file)
2127 off_t start, data = 0, hole = 0;
2128 int64_t total_size;
2129 int ret;
2131 ret = fd_open(bs);
2132 if (ret < 0) {
2133 return ret;
2136 start = sector_num * BDRV_SECTOR_SIZE;
2137 total_size = bdrv_getlength(bs);
2138 if (total_size < 0) {
2139 return total_size;
2140 } else if (start >= total_size) {
2141 *pnum = 0;
2142 return 0;
2143 } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
2144 nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
2147 ret = find_allocation(bs, start, &data, &hole);
2148 if (ret == -ENXIO) {
2149 /* Trailing hole */
2150 *pnum = nb_sectors;
2151 ret = BDRV_BLOCK_ZERO;
2152 } else if (ret < 0) {
2153 /* No info available, so pretend there are no holes */
2154 *pnum = nb_sectors;
2155 ret = BDRV_BLOCK_DATA;
2156 } else if (data == start) {
2157 /* On a data extent, compute sectors to the end of the extent,
2158 * possibly including a partial sector at EOF. */
2159 *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
2160 ret = BDRV_BLOCK_DATA;
2161 } else {
2162 /* On a hole, compute sectors to the beginning of the next extent. */
2163 assert(hole == start);
2164 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
2165 ret = BDRV_BLOCK_ZERO;
2167 *file = bs;
2168 return ret | BDRV_BLOCK_OFFSET_VALID | start;
2171 static coroutine_fn BlockAIOCB *raw_aio_pdiscard(BlockDriverState *bs,
2172 int64_t offset, int bytes,
2173 BlockCompletionFunc *cb, void *opaque)
2175 BDRVRawState *s = bs->opaque;
2177 return paio_submit(bs, s->fd, offset, NULL, bytes,
2178 cb, opaque, QEMU_AIO_DISCARD);
2181 static int coroutine_fn raw_co_pwrite_zeroes(
2182 BlockDriverState *bs, int64_t offset,
2183 int bytes, BdrvRequestFlags flags)
2185 BDRVRawState *s = bs->opaque;
2187 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
2188 return paio_submit_co(bs, s->fd, offset, NULL, bytes,
2189 QEMU_AIO_WRITE_ZEROES);
2190 } else if (s->discard_zeroes) {
2191 return paio_submit_co(bs, s->fd, offset, NULL, bytes,
2192 QEMU_AIO_DISCARD);
2194 return -ENOTSUP;
2197 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2199 BDRVRawState *s = bs->opaque;
2201 bdi->unallocated_blocks_are_zero = s->discard_zeroes;
2202 bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
2203 return 0;
2206 static QemuOptsList raw_create_opts = {
2207 .name = "raw-create-opts",
2208 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
2209 .desc = {
2211 .name = BLOCK_OPT_SIZE,
2212 .type = QEMU_OPT_SIZE,
2213 .help = "Virtual disk size"
2216 .name = BLOCK_OPT_NOCOW,
2217 .type = QEMU_OPT_BOOL,
2218 .help = "Turn off copy-on-write (valid only on btrfs)"
2221 .name = BLOCK_OPT_PREALLOC,
2222 .type = QEMU_OPT_STRING,
2223 .help = "Preallocation mode (allowed values: off, falloc, full)"
2225 { /* end of list */ }
2229 static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared,
2230 Error **errp)
2232 return raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp);
2235 static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared)
2237 BDRVRawState *s = bs->opaque;
2238 raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL);
2239 s->perm = perm;
2240 s->shared_perm = shared;
2243 static void raw_abort_perm_update(BlockDriverState *bs)
2245 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL);
2248 BlockDriver bdrv_file = {
2249 .format_name = "file",
2250 .protocol_name = "file",
2251 .instance_size = sizeof(BDRVRawState),
2252 .bdrv_needs_filename = true,
2253 .bdrv_probe = NULL, /* no probe for protocols */
2254 .bdrv_parse_filename = raw_parse_filename,
2255 .bdrv_file_open = raw_open,
2256 .bdrv_reopen_prepare = raw_reopen_prepare,
2257 .bdrv_reopen_commit = raw_reopen_commit,
2258 .bdrv_reopen_abort = raw_reopen_abort,
2259 .bdrv_close = raw_close,
2260 .bdrv_create = raw_create,
2261 .bdrv_has_zero_init = bdrv_has_zero_init_1,
2262 .bdrv_co_get_block_status = raw_co_get_block_status,
2263 .bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,
2265 .bdrv_co_preadv = raw_co_preadv,
2266 .bdrv_co_pwritev = raw_co_pwritev,
2267 .bdrv_aio_flush = raw_aio_flush,
2268 .bdrv_aio_pdiscard = raw_aio_pdiscard,
2269 .bdrv_refresh_limits = raw_refresh_limits,
2270 .bdrv_io_plug = raw_aio_plug,
2271 .bdrv_io_unplug = raw_aio_unplug,
2273 .bdrv_truncate = raw_truncate,
2274 .bdrv_getlength = raw_getlength,
2275 .bdrv_get_info = raw_get_info,
2276 .bdrv_get_allocated_file_size
2277 = raw_get_allocated_file_size,
2278 .bdrv_check_perm = raw_check_perm,
2279 .bdrv_set_perm = raw_set_perm,
2280 .bdrv_abort_perm_update = raw_abort_perm_update,
2281 .create_opts = &raw_create_opts,
2284 /***********************************************/
2285 /* host device */
2287 #if defined(__APPLE__) && defined(__MACH__)
2288 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
2289 CFIndex maxPathSize, int flags);
2290 static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
2292 kern_return_t kernResult = KERN_FAILURE;
2293 mach_port_t masterPort;
2294 CFMutableDictionaryRef classesToMatch;
2295 const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass};
2296 char *mediaType = NULL;
2298 kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
2299 if ( KERN_SUCCESS != kernResult ) {
2300 printf( "IOMasterPort returned %d\n", kernResult );
2303 int index;
2304 for (index = 0; index < ARRAY_SIZE(matching_array); index++) {
2305 classesToMatch = IOServiceMatching(matching_array[index]);
2306 if (classesToMatch == NULL) {
2307 error_report("IOServiceMatching returned NULL for %s",
2308 matching_array[index]);
2309 continue;
2311 CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey),
2312 kCFBooleanTrue);
2313 kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch,
2314 mediaIterator);
2315 if (kernResult != KERN_SUCCESS) {
2316 error_report("Note: IOServiceGetMatchingServices returned %d",
2317 kernResult);
2318 continue;
2321 /* If a match was found, leave the loop */
2322 if (*mediaIterator != 0) {
2323 DPRINTF("Matching using %s\n", matching_array[index]);
2324 mediaType = g_strdup(matching_array[index]);
2325 break;
2328 return mediaType;
2331 kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
2332 CFIndex maxPathSize, int flags)
2334 io_object_t nextMedia;
2335 kern_return_t kernResult = KERN_FAILURE;
2336 *bsdPath = '\0';
2337 nextMedia = IOIteratorNext( mediaIterator );
2338 if ( nextMedia )
2340 CFTypeRef bsdPathAsCFString;
2341 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
2342 if ( bsdPathAsCFString ) {
2343 size_t devPathLength;
2344 strcpy( bsdPath, _PATH_DEV );
2345 if (flags & BDRV_O_NOCACHE) {
2346 strcat(bsdPath, "r");
2348 devPathLength = strlen( bsdPath );
2349 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
2350 kernResult = KERN_SUCCESS;
2352 CFRelease( bsdPathAsCFString );
2354 IOObjectRelease( nextMedia );
2357 return kernResult;
2360 /* Sets up a real cdrom for use in QEMU */
2361 static bool setup_cdrom(char *bsd_path, Error **errp)
2363 int index, num_of_test_partitions = 2, fd;
2364 char test_partition[MAXPATHLEN];
2365 bool partition_found = false;
2367 /* look for a working partition */
2368 for (index = 0; index < num_of_test_partitions; index++) {
2369 snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path,
2370 index);
2371 fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE);
2372 if (fd >= 0) {
2373 partition_found = true;
2374 qemu_close(fd);
2375 break;
2379 /* if a working partition on the device was not found */
2380 if (partition_found == false) {
2381 error_setg(errp, "Failed to find a working partition on disc");
2382 } else {
2383 DPRINTF("Using %s as optical disc\n", test_partition);
2384 pstrcpy(bsd_path, MAXPATHLEN, test_partition);
2386 return partition_found;
2389 /* Prints directions on mounting and unmounting a device */
2390 static void print_unmounting_directions(const char *file_name)
2392 error_report("If device %s is mounted on the desktop, unmount"
2393 " it first before using it in QEMU", file_name);
2394 error_report("Command to unmount device: diskutil unmountDisk %s",
2395 file_name);
2396 error_report("Command to mount device: diskutil mountDisk %s", file_name);
2399 #endif /* defined(__APPLE__) && defined(__MACH__) */
2401 static int hdev_probe_device(const char *filename)
2403 struct stat st;
2405 /* allow a dedicated CD-ROM driver to match with a higher priority */
2406 if (strstart(filename, "/dev/cdrom", NULL))
2407 return 50;
2409 if (stat(filename, &st) >= 0 &&
2410 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
2411 return 100;
2414 return 0;
2417 static int check_hdev_writable(BDRVRawState *s)
2419 #if defined(BLKROGET)
2420 /* Linux block devices can be configured "read-only" using blockdev(8).
2421 * This is independent of device node permissions and therefore open(2)
2422 * with O_RDWR succeeds. Actual writes fail with EPERM.
2424 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
2425 * check for read-only block devices so that Linux block devices behave
2426 * properly.
2428 struct stat st;
2429 int readonly = 0;
2431 if (fstat(s->fd, &st)) {
2432 return -errno;
2435 if (!S_ISBLK(st.st_mode)) {
2436 return 0;
2439 if (ioctl(s->fd, BLKROGET, &readonly) < 0) {
2440 return -errno;
2443 if (readonly) {
2444 return -EACCES;
2446 #endif /* defined(BLKROGET) */
2447 return 0;
2450 static void hdev_parse_filename(const char *filename, QDict *options,
2451 Error **errp)
2453 bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
2456 static bool hdev_is_sg(BlockDriverState *bs)
2459 #if defined(__linux__)
2461 BDRVRawState *s = bs->opaque;
2462 struct stat st;
2463 struct sg_scsi_id scsiid;
2464 int sg_version;
2465 int ret;
2467 if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) {
2468 return false;
2471 ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version);
2472 if (ret < 0) {
2473 return false;
2476 ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid);
2477 if (ret >= 0) {
2478 DPRINTF("SG device found: type=%d, version=%d\n",
2479 scsiid.scsi_type, sg_version);
2480 return true;
2483 #endif
2485 return false;
2488 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
2489 Error **errp)
2491 BDRVRawState *s = bs->opaque;
2492 Error *local_err = NULL;
2493 int ret;
2495 #if defined(__APPLE__) && defined(__MACH__)
2497 * Caution: while qdict_get_str() is fine, getting non-string types
2498 * would require more care. When @options come from -blockdev or
2499 * blockdev_add, its members are typed according to the QAPI
2500 * schema, but when they come from -drive, they're all QString.
2502 const char *filename = qdict_get_str(options, "filename");
2503 char bsd_path[MAXPATHLEN] = "";
2504 bool error_occurred = false;
2506 /* If using a real cdrom */
2507 if (strcmp(filename, "/dev/cdrom") == 0) {
2508 char *mediaType = NULL;
2509 kern_return_t ret_val;
2510 io_iterator_t mediaIterator = 0;
2512 mediaType = FindEjectableOpticalMedia(&mediaIterator);
2513 if (mediaType == NULL) {
2514 error_setg(errp, "Please make sure your CD/DVD is in the optical"
2515 " drive");
2516 error_occurred = true;
2517 goto hdev_open_Mac_error;
2520 ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags);
2521 if (ret_val != KERN_SUCCESS) {
2522 error_setg(errp, "Could not get BSD path for optical drive");
2523 error_occurred = true;
2524 goto hdev_open_Mac_error;
2527 /* If a real optical drive was not found */
2528 if (bsd_path[0] == '\0') {
2529 error_setg(errp, "Failed to obtain bsd path for optical drive");
2530 error_occurred = true;
2531 goto hdev_open_Mac_error;
2534 /* If using a cdrom disc and finding a partition on the disc failed */
2535 if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 &&
2536 setup_cdrom(bsd_path, errp) == false) {
2537 print_unmounting_directions(bsd_path);
2538 error_occurred = true;
2539 goto hdev_open_Mac_error;
2542 qdict_put_str(options, "filename", bsd_path);
2544 hdev_open_Mac_error:
2545 g_free(mediaType);
2546 if (mediaIterator) {
2547 IOObjectRelease(mediaIterator);
2549 if (error_occurred) {
2550 return -ENOENT;
2553 #endif /* defined(__APPLE__) && defined(__MACH__) */
2555 s->type = FTYPE_FILE;
2557 ret = raw_open_common(bs, options, flags, 0, &local_err);
2558 if (ret < 0) {
2559 error_propagate(errp, local_err);
2560 #if defined(__APPLE__) && defined(__MACH__)
2561 if (*bsd_path) {
2562 filename = bsd_path;
2564 /* if a physical device experienced an error while being opened */
2565 if (strncmp(filename, "/dev/", 5) == 0) {
2566 print_unmounting_directions(filename);
2568 #endif /* defined(__APPLE__) && defined(__MACH__) */
2569 return ret;
2572 /* Since this does ioctl the device must be already opened */
2573 bs->sg = hdev_is_sg(bs);
2575 if (flags & BDRV_O_RDWR) {
2576 ret = check_hdev_writable(s);
2577 if (ret < 0) {
2578 raw_close(bs);
2579 error_setg_errno(errp, -ret, "The device is not writable");
2580 return ret;
2584 return ret;
2587 #if defined(__linux__)
2589 static BlockAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
2590 unsigned long int req, void *buf,
2591 BlockCompletionFunc *cb, void *opaque)
2593 BDRVRawState *s = bs->opaque;
2594 RawPosixAIOData *acb;
2595 ThreadPool *pool;
2597 if (fd_open(bs) < 0)
2598 return NULL;
2600 acb = g_new(RawPosixAIOData, 1);
2601 acb->bs = bs;
2602 acb->aio_type = QEMU_AIO_IOCTL;
2603 acb->aio_fildes = s->fd;
2604 acb->aio_offset = 0;
2605 acb->aio_ioctl_buf = buf;
2606 acb->aio_ioctl_cmd = req;
2607 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
2608 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
2610 #endif /* linux */
2612 static int fd_open(BlockDriverState *bs)
2614 BDRVRawState *s = bs->opaque;
2616 /* this is just to ensure s->fd is sane (its called by io ops) */
2617 if (s->fd >= 0)
2618 return 0;
2619 return -EIO;
2622 static coroutine_fn BlockAIOCB *hdev_aio_pdiscard(BlockDriverState *bs,
2623 int64_t offset, int bytes,
2624 BlockCompletionFunc *cb, void *opaque)
2626 BDRVRawState *s = bs->opaque;
2628 if (fd_open(bs) < 0) {
2629 return NULL;
2631 return paio_submit(bs, s->fd, offset, NULL, bytes,
2632 cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
2635 static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs,
2636 int64_t offset, int bytes, BdrvRequestFlags flags)
2638 BDRVRawState *s = bs->opaque;
2639 int rc;
2641 rc = fd_open(bs);
2642 if (rc < 0) {
2643 return rc;
2645 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
2646 return paio_submit_co(bs, s->fd, offset, NULL, bytes,
2647 QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
2648 } else if (s->discard_zeroes) {
2649 return paio_submit_co(bs, s->fd, offset, NULL, bytes,
2650 QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
2652 return -ENOTSUP;
2655 static int hdev_create(const char *filename, QemuOpts *opts,
2656 Error **errp)
2658 int fd;
2659 int ret = 0;
2660 struct stat stat_buf;
2661 int64_t total_size = 0;
2662 bool has_prefix;
2664 /* This function is used by both protocol block drivers and therefore either
2665 * of these prefixes may be given.
2666 * The return value has to be stored somewhere, otherwise this is an error
2667 * due to -Werror=unused-value. */
2668 has_prefix =
2669 strstart(filename, "host_device:", &filename) ||
2670 strstart(filename, "host_cdrom:" , &filename);
2672 (void)has_prefix;
2674 ret = raw_normalize_devicepath(&filename);
2675 if (ret < 0) {
2676 error_setg_errno(errp, -ret, "Could not normalize device path");
2677 return ret;
2680 /* Read out options */
2681 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2682 BDRV_SECTOR_SIZE);
2684 fd = qemu_open(filename, O_WRONLY | O_BINARY);
2685 if (fd < 0) {
2686 ret = -errno;
2687 error_setg_errno(errp, -ret, "Could not open device");
2688 return ret;
2691 if (fstat(fd, &stat_buf) < 0) {
2692 ret = -errno;
2693 error_setg_errno(errp, -ret, "Could not stat device");
2694 } else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
2695 error_setg(errp,
2696 "The given file is neither a block nor a character device");
2697 ret = -ENODEV;
2698 } else if (lseek(fd, 0, SEEK_END) < total_size) {
2699 error_setg(errp, "Device is too small");
2700 ret = -ENOSPC;
2703 qemu_close(fd);
2704 return ret;
2707 static BlockDriver bdrv_host_device = {
2708 .format_name = "host_device",
2709 .protocol_name = "host_device",
2710 .instance_size = sizeof(BDRVRawState),
2711 .bdrv_needs_filename = true,
2712 .bdrv_probe_device = hdev_probe_device,
2713 .bdrv_parse_filename = hdev_parse_filename,
2714 .bdrv_file_open = hdev_open,
2715 .bdrv_close = raw_close,
2716 .bdrv_reopen_prepare = raw_reopen_prepare,
2717 .bdrv_reopen_commit = raw_reopen_commit,
2718 .bdrv_reopen_abort = raw_reopen_abort,
2719 .bdrv_create = hdev_create,
2720 .create_opts = &raw_create_opts,
2721 .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
2723 .bdrv_co_preadv = raw_co_preadv,
2724 .bdrv_co_pwritev = raw_co_pwritev,
2725 .bdrv_aio_flush = raw_aio_flush,
2726 .bdrv_aio_pdiscard = hdev_aio_pdiscard,
2727 .bdrv_refresh_limits = raw_refresh_limits,
2728 .bdrv_io_plug = raw_aio_plug,
2729 .bdrv_io_unplug = raw_aio_unplug,
2731 .bdrv_truncate = raw_truncate,
2732 .bdrv_getlength = raw_getlength,
2733 .bdrv_get_info = raw_get_info,
2734 .bdrv_get_allocated_file_size
2735 = raw_get_allocated_file_size,
2736 .bdrv_check_perm = raw_check_perm,
2737 .bdrv_set_perm = raw_set_perm,
2738 .bdrv_abort_perm_update = raw_abort_perm_update,
2739 .bdrv_probe_blocksizes = hdev_probe_blocksizes,
2740 .bdrv_probe_geometry = hdev_probe_geometry,
2742 /* generic scsi device */
2743 #ifdef __linux__
2744 .bdrv_aio_ioctl = hdev_aio_ioctl,
2745 #endif
2748 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2749 static void cdrom_parse_filename(const char *filename, QDict *options,
2750 Error **errp)
2752 bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options);
2754 #endif
2756 #ifdef __linux__
2757 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2758 Error **errp)
2760 BDRVRawState *s = bs->opaque;
2762 s->type = FTYPE_CD;
2764 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2765 return raw_open_common(bs, options, flags, O_NONBLOCK, errp);
2768 static int cdrom_probe_device(const char *filename)
2770 int fd, ret;
2771 int prio = 0;
2772 struct stat st;
2774 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
2775 if (fd < 0) {
2776 goto out;
2778 ret = fstat(fd, &st);
2779 if (ret == -1 || !S_ISBLK(st.st_mode)) {
2780 goto outc;
2783 /* Attempt to detect via a CDROM specific ioctl */
2784 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2785 if (ret >= 0)
2786 prio = 100;
2788 outc:
2789 qemu_close(fd);
2790 out:
2791 return prio;
2794 static bool cdrom_is_inserted(BlockDriverState *bs)
2796 BDRVRawState *s = bs->opaque;
2797 int ret;
2799 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2800 return ret == CDS_DISC_OK;
2803 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2805 BDRVRawState *s = bs->opaque;
2807 if (eject_flag) {
2808 if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
2809 perror("CDROMEJECT");
2810 } else {
2811 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
2812 perror("CDROMEJECT");
2816 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2818 BDRVRawState *s = bs->opaque;
2820 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
2822 * Note: an error can happen if the distribution automatically
2823 * mounts the CD-ROM
2825 /* perror("CDROM_LOCKDOOR"); */
2829 static BlockDriver bdrv_host_cdrom = {
2830 .format_name = "host_cdrom",
2831 .protocol_name = "host_cdrom",
2832 .instance_size = sizeof(BDRVRawState),
2833 .bdrv_needs_filename = true,
2834 .bdrv_probe_device = cdrom_probe_device,
2835 .bdrv_parse_filename = cdrom_parse_filename,
2836 .bdrv_file_open = cdrom_open,
2837 .bdrv_close = raw_close,
2838 .bdrv_reopen_prepare = raw_reopen_prepare,
2839 .bdrv_reopen_commit = raw_reopen_commit,
2840 .bdrv_reopen_abort = raw_reopen_abort,
2841 .bdrv_create = hdev_create,
2842 .create_opts = &raw_create_opts,
2845 .bdrv_co_preadv = raw_co_preadv,
2846 .bdrv_co_pwritev = raw_co_pwritev,
2847 .bdrv_aio_flush = raw_aio_flush,
2848 .bdrv_refresh_limits = raw_refresh_limits,
2849 .bdrv_io_plug = raw_aio_plug,
2850 .bdrv_io_unplug = raw_aio_unplug,
2852 .bdrv_truncate = raw_truncate,
2853 .bdrv_getlength = raw_getlength,
2854 .has_variable_length = true,
2855 .bdrv_get_allocated_file_size
2856 = raw_get_allocated_file_size,
2858 /* removable device support */
2859 .bdrv_is_inserted = cdrom_is_inserted,
2860 .bdrv_eject = cdrom_eject,
2861 .bdrv_lock_medium = cdrom_lock_medium,
2863 /* generic scsi device */
2864 .bdrv_aio_ioctl = hdev_aio_ioctl,
2866 #endif /* __linux__ */
2868 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2869 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2870 Error **errp)
2872 BDRVRawState *s = bs->opaque;
2873 Error *local_err = NULL;
2874 int ret;
2876 s->type = FTYPE_CD;
2878 ret = raw_open_common(bs, options, flags, 0, &local_err);
2879 if (ret) {
2880 error_propagate(errp, local_err);
2881 return ret;
2884 /* make sure the door isn't locked at this time */
2885 ioctl(s->fd, CDIOCALLOW);
2886 return 0;
2889 static int cdrom_probe_device(const char *filename)
2891 if (strstart(filename, "/dev/cd", NULL) ||
2892 strstart(filename, "/dev/acd", NULL))
2893 return 100;
2894 return 0;
2897 static int cdrom_reopen(BlockDriverState *bs)
2899 BDRVRawState *s = bs->opaque;
2900 int fd;
2903 * Force reread of possibly changed/newly loaded disc,
2904 * FreeBSD seems to not notice sometimes...
2906 if (s->fd >= 0)
2907 qemu_close(s->fd);
2908 fd = qemu_open(bs->filename, s->open_flags, 0644);
2909 if (fd < 0) {
2910 s->fd = -1;
2911 return -EIO;
2913 s->fd = fd;
2915 /* make sure the door isn't locked at this time */
2916 ioctl(s->fd, CDIOCALLOW);
2917 return 0;
2920 static bool cdrom_is_inserted(BlockDriverState *bs)
2922 return raw_getlength(bs) > 0;
2925 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2927 BDRVRawState *s = bs->opaque;
2929 if (s->fd < 0)
2930 return;
2932 (void) ioctl(s->fd, CDIOCALLOW);
2934 if (eject_flag) {
2935 if (ioctl(s->fd, CDIOCEJECT) < 0)
2936 perror("CDIOCEJECT");
2937 } else {
2938 if (ioctl(s->fd, CDIOCCLOSE) < 0)
2939 perror("CDIOCCLOSE");
2942 cdrom_reopen(bs);
2945 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2947 BDRVRawState *s = bs->opaque;
2949 if (s->fd < 0)
2950 return;
2951 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
2953 * Note: an error can happen if the distribution automatically
2954 * mounts the CD-ROM
2956 /* perror("CDROM_LOCKDOOR"); */
2960 static BlockDriver bdrv_host_cdrom = {
2961 .format_name = "host_cdrom",
2962 .protocol_name = "host_cdrom",
2963 .instance_size = sizeof(BDRVRawState),
2964 .bdrv_needs_filename = true,
2965 .bdrv_probe_device = cdrom_probe_device,
2966 .bdrv_parse_filename = cdrom_parse_filename,
2967 .bdrv_file_open = cdrom_open,
2968 .bdrv_close = raw_close,
2969 .bdrv_reopen_prepare = raw_reopen_prepare,
2970 .bdrv_reopen_commit = raw_reopen_commit,
2971 .bdrv_reopen_abort = raw_reopen_abort,
2972 .bdrv_create = hdev_create,
2973 .create_opts = &raw_create_opts,
2975 .bdrv_co_preadv = raw_co_preadv,
2976 .bdrv_co_pwritev = raw_co_pwritev,
2977 .bdrv_aio_flush = raw_aio_flush,
2978 .bdrv_refresh_limits = raw_refresh_limits,
2979 .bdrv_io_plug = raw_aio_plug,
2980 .bdrv_io_unplug = raw_aio_unplug,
2982 .bdrv_truncate = raw_truncate,
2983 .bdrv_getlength = raw_getlength,
2984 .has_variable_length = true,
2985 .bdrv_get_allocated_file_size
2986 = raw_get_allocated_file_size,
2988 /* removable device support */
2989 .bdrv_is_inserted = cdrom_is_inserted,
2990 .bdrv_eject = cdrom_eject,
2991 .bdrv_lock_medium = cdrom_lock_medium,
2993 #endif /* __FreeBSD__ */
2995 static void bdrv_file_init(void)
2998 * Register all the drivers. Note that order is important, the driver
2999 * registered last will get probed first.
3001 bdrv_register(&bdrv_file);
3002 bdrv_register(&bdrv_host_device);
3003 #ifdef __linux__
3004 bdrv_register(&bdrv_host_cdrom);
3005 #endif
3006 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
3007 bdrv_register(&bdrv_host_cdrom);
3008 #endif
3011 block_init(bdrv_file_init);