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
24 #include "qemu/osdep.h"
25 #include "qemu-common.h"
26 #include "qemu/error-report.h"
27 #include "qemu/timer.h"
29 #include "block/block_int.h"
30 #include "qemu/module.h"
32 #include "block/thread-pool.h"
35 #include "qapi/util.h"
36 #include "qapi/qmp/qstring.h"
38 #if defined(__APPLE__) && (__MACH__)
40 #include <sys/param.h>
41 #include <IOKit/IOKitLib.h>
42 #include <IOKit/IOBSD.h>
43 #include <IOKit/storage/IOMediaBSDClient.h>
44 #include <IOKit/storage/IOMedia.h>
45 #include <IOKit/storage/IOCDMedia.h>
46 //#include <IOKit/storage/IOCDTypes.h>
47 #include <CoreFoundation/CoreFoundation.h>
51 #define _POSIX_PTHREAD_SEMANTICS 1
55 #include <sys/ioctl.h>
56 #include <sys/param.h>
57 #include <linux/cdrom.h>
60 #include <linux/hdreg.h>
66 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
69 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
70 #include <linux/falloc.h>
72 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
78 #include <sys/ioctl.h>
79 #include <sys/disklabel.h>
84 #include <sys/ioctl.h>
85 #include <sys/disklabel.h>
91 #include <sys/ioctl.h>
92 #include <sys/diskslice.h>
102 # define DEBUG_BLOCK_PRINT 1
104 # define DEBUG_BLOCK_PRINT 0
106 #define DPRINTF(fmt, ...) \
108 if (DEBUG_BLOCK_PRINT) { \
109 printf(fmt, ## __VA_ARGS__); \
113 /* OS X does not have O_DSYNC */
116 #define O_DSYNC O_SYNC
117 #elif defined(O_FSYNC)
118 #define O_DSYNC O_FSYNC
122 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
124 #define O_DIRECT O_DSYNC
130 #define MAX_BLOCKSIZE 4096
132 typedef struct BDRVRawState
{
138 #ifdef CONFIG_LINUX_AIO
146 bool has_write_zeroes
:1;
147 bool discard_zeroes
:1;
149 bool needs_alignment
;
152 typedef struct BDRVRawReopenState
{
155 #ifdef CONFIG_LINUX_AIO
158 } BDRVRawReopenState
;
160 static int fd_open(BlockDriverState
*bs
);
161 static int64_t raw_getlength(BlockDriverState
*bs
);
163 typedef struct RawPosixAIOData
{
164 BlockDriverState
*bs
;
167 struct iovec
*aio_iov
;
172 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
177 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
178 static int cdrom_reopen(BlockDriverState
*bs
);
181 #if defined(__NetBSD__)
182 static int raw_normalize_devicepath(const char **filename
)
184 static char namebuf
[PATH_MAX
];
185 const char *dp
, *fname
;
189 dp
= strrchr(fname
, '/');
190 if (lstat(fname
, &sb
) < 0) {
191 fprintf(stderr
, "%s: stat failed: %s\n",
192 fname
, strerror(errno
));
196 if (!S_ISBLK(sb
.st_mode
)) {
201 snprintf(namebuf
, PATH_MAX
, "r%s", fname
);
203 snprintf(namebuf
, PATH_MAX
, "%.*s/r%s",
204 (int)(dp
- fname
), fname
, dp
+ 1);
206 fprintf(stderr
, "%s is a block device", fname
);
208 fprintf(stderr
, ", using %s\n", *filename
);
213 static int raw_normalize_devicepath(const char **filename
)
220 * Get logical block size via ioctl. On success store it in @sector_size_p.
222 static int probe_logical_blocksize(int fd
, unsigned int *sector_size_p
)
224 unsigned int sector_size
;
225 bool success
= false;
229 /* Try a few ioctls to get the right size */
231 if (ioctl(fd
, BLKSSZGET
, §or_size
) >= 0) {
232 *sector_size_p
= sector_size
;
236 #ifdef DKIOCGETBLOCKSIZE
237 if (ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) >= 0) {
238 *sector_size_p
= sector_size
;
242 #ifdef DIOCGSECTORSIZE
243 if (ioctl(fd
, DIOCGSECTORSIZE
, §or_size
) >= 0) {
244 *sector_size_p
= sector_size
;
249 return success
? 0 : -errno
;
253 * Get physical block size of @fd.
254 * On success, store it in @blk_size and return 0.
255 * On failure, return -errno.
257 static int probe_physical_blocksize(int fd
, unsigned int *blk_size
)
260 if (ioctl(fd
, BLKPBSZGET
, blk_size
) < 0) {
269 /* Check if read is allowed with given memory buffer and length.
271 * This function is used to check O_DIRECT memory buffer and request alignment.
273 static bool raw_is_io_aligned(int fd
, void *buf
, size_t len
)
275 ssize_t ret
= pread(fd
, buf
, len
, 0);
282 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
283 * other errors (e.g. real I/O error), which could happen on a failed
284 * drive, since we only care about probing alignment.
286 if (errno
!= EINVAL
) {
294 static void raw_probe_alignment(BlockDriverState
*bs
, int fd
, Error
**errp
)
296 BDRVRawState
*s
= bs
->opaque
;
298 size_t max_align
= MAX(MAX_BLOCKSIZE
, getpagesize());
300 /* For SCSI generic devices the alignment is not really used.
301 With buffered I/O, we don't have any restrictions. */
302 if (bdrv_is_sg(bs
) || !s
->needs_alignment
) {
303 bs
->request_alignment
= 1;
308 bs
->request_alignment
= 0;
310 /* Let's try to use the logical blocksize for the alignment. */
311 if (probe_logical_blocksize(fd
, &bs
->request_alignment
) < 0) {
312 bs
->request_alignment
= 0;
317 if (xfsctl(NULL
, fd
, XFS_IOC_DIOINFO
, &da
) >= 0) {
318 bs
->request_alignment
= da
.d_miniosz
;
319 /* The kernel returns wrong information for d_mem */
320 /* s->buf_align = da.d_mem; */
325 /* If we could not get the sizes so far, we can only guess them */
328 buf
= qemu_memalign(max_align
, 2 * max_align
);
329 for (align
= 512; align
<= max_align
; align
<<= 1) {
330 if (raw_is_io_aligned(fd
, buf
+ align
, max_align
)) {
331 s
->buf_align
= align
;
338 if (!bs
->request_alignment
) {
340 buf
= qemu_memalign(s
->buf_align
, max_align
);
341 for (align
= 512; align
<= max_align
; align
<<= 1) {
342 if (raw_is_io_aligned(fd
, buf
, align
)) {
343 bs
->request_alignment
= align
;
350 if (!s
->buf_align
|| !bs
->request_alignment
) {
351 error_setg(errp
, "Could not find working O_DIRECT alignment. "
352 "Try cache.direct=off.");
356 static void raw_parse_flags(int bdrv_flags
, int *open_flags
)
358 assert(open_flags
!= NULL
);
360 *open_flags
|= O_BINARY
;
361 *open_flags
&= ~O_ACCMODE
;
362 if (bdrv_flags
& BDRV_O_RDWR
) {
363 *open_flags
|= O_RDWR
;
365 *open_flags
|= O_RDONLY
;
368 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
369 * and O_DIRECT for no caching. */
370 if ((bdrv_flags
& BDRV_O_NOCACHE
)) {
371 *open_flags
|= O_DIRECT
;
375 static void raw_detach_aio_context(BlockDriverState
*bs
)
377 #ifdef CONFIG_LINUX_AIO
378 BDRVRawState
*s
= bs
->opaque
;
381 laio_detach_aio_context(s
->aio_ctx
, bdrv_get_aio_context(bs
));
386 static void raw_attach_aio_context(BlockDriverState
*bs
,
387 AioContext
*new_context
)
389 #ifdef CONFIG_LINUX_AIO
390 BDRVRawState
*s
= bs
->opaque
;
393 laio_attach_aio_context(s
->aio_ctx
, new_context
);
398 #ifdef CONFIG_LINUX_AIO
399 static int raw_set_aio(void **aio_ctx
, int *use_aio
, int bdrv_flags
)
402 assert(aio_ctx
!= NULL
);
403 assert(use_aio
!= NULL
);
405 * Currently Linux do AIO only for files opened with O_DIRECT
406 * specified so check NOCACHE flag too
408 if ((bdrv_flags
& (BDRV_O_NOCACHE
|BDRV_O_NATIVE_AIO
)) ==
409 (BDRV_O_NOCACHE
|BDRV_O_NATIVE_AIO
)) {
411 /* if non-NULL, laio_init() has already been run */
412 if (*aio_ctx
== NULL
) {
413 *aio_ctx
= laio_init();
430 static void raw_parse_filename(const char *filename
, QDict
*options
,
433 /* The filename does not have to be prefixed by the protocol name, since
434 * "file" is the default protocol; therefore, the return value of this
435 * function call can be ignored. */
436 strstart(filename
, "file:", &filename
);
438 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
441 static QemuOptsList raw_runtime_opts
= {
443 .head
= QTAILQ_HEAD_INITIALIZER(raw_runtime_opts
.head
),
447 .type
= QEMU_OPT_STRING
,
448 .help
= "File name of the image",
450 { /* end of list */ }
454 static int raw_open_common(BlockDriverState
*bs
, QDict
*options
,
455 int bdrv_flags
, int open_flags
, Error
**errp
)
457 BDRVRawState
*s
= bs
->opaque
;
459 Error
*local_err
= NULL
;
460 const char *filename
= NULL
;
464 opts
= qemu_opts_create(&raw_runtime_opts
, NULL
, 0, &error_abort
);
465 qemu_opts_absorb_qdict(opts
, options
, &local_err
);
467 error_propagate(errp
, local_err
);
472 filename
= qemu_opt_get(opts
, "filename");
474 ret
= raw_normalize_devicepath(&filename
);
476 error_setg_errno(errp
, -ret
, "Could not normalize device path");
480 s
->open_flags
= open_flags
;
481 raw_parse_flags(bdrv_flags
, &s
->open_flags
);
484 fd
= qemu_open(filename
, s
->open_flags
, 0644);
494 #ifdef CONFIG_LINUX_AIO
495 if (raw_set_aio(&s
->aio_ctx
, &s
->use_aio
, bdrv_flags
)) {
498 error_setg_errno(errp
, -ret
, "Could not set AIO state");
501 if (!s
->use_aio
&& (bdrv_flags
& BDRV_O_NATIVE_AIO
)) {
502 error_setg(errp
, "aio=native was specified, but it requires "
503 "cache.direct=on, which was not specified.");
508 if (bdrv_flags
& BDRV_O_NATIVE_AIO
) {
509 error_setg(errp
, "aio=native was specified, but is not supported "
514 #endif /* !defined(CONFIG_LINUX_AIO) */
516 s
->has_discard
= true;
517 s
->has_write_zeroes
= true;
518 if ((bs
->open_flags
& BDRV_O_NOCACHE
) != 0) {
519 s
->needs_alignment
= true;
522 if (fstat(s
->fd
, &st
) < 0) {
524 error_setg_errno(errp
, errno
, "Could not stat file");
527 if (S_ISREG(st
.st_mode
)) {
528 s
->discard_zeroes
= true;
529 s
->has_fallocate
= true;
531 if (S_ISBLK(st
.st_mode
)) {
532 #ifdef BLKDISCARDZEROES
534 if (ioctl(s
->fd
, BLKDISCARDZEROES
, &arg
) == 0 && arg
) {
535 s
->discard_zeroes
= true;
539 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
540 * not rely on the contents of discarded blocks unless using O_DIRECT.
541 * Same for BLKZEROOUT.
543 if (!(bs
->open_flags
& BDRV_O_NOCACHE
)) {
544 s
->discard_zeroes
= false;
545 s
->has_write_zeroes
= false;
550 if (S_ISCHR(st
.st_mode
)) {
552 * The file is a char device (disk), which on FreeBSD isn't behind
553 * a pager, so force all requests to be aligned. This is needed
554 * so QEMU makes sure all IO operations on the device are aligned
555 * to sector size, or else FreeBSD will reject them with EINVAL.
557 s
->needs_alignment
= true;
562 if (platform_test_xfs_fd(s
->fd
)) {
567 raw_attach_aio_context(bs
, bdrv_get_aio_context(bs
));
571 if (filename
&& (bdrv_flags
& BDRV_O_TEMPORARY
)) {
578 static int raw_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
581 BDRVRawState
*s
= bs
->opaque
;
582 Error
*local_err
= NULL
;
585 s
->type
= FTYPE_FILE
;
586 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
588 error_propagate(errp
, local_err
);
593 static int raw_reopen_prepare(BDRVReopenState
*state
,
594 BlockReopenQueue
*queue
, Error
**errp
)
597 BDRVRawReopenState
*raw_s
;
599 Error
*local_err
= NULL
;
601 assert(state
!= NULL
);
602 assert(state
->bs
!= NULL
);
604 s
= state
->bs
->opaque
;
606 state
->opaque
= g_new0(BDRVRawReopenState
, 1);
607 raw_s
= state
->opaque
;
609 #ifdef CONFIG_LINUX_AIO
610 raw_s
->use_aio
= s
->use_aio
;
612 /* we can use s->aio_ctx instead of a copy, because the use_aio flag is
613 * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
614 * won't override aio_ctx if aio_ctx is non-NULL */
615 if (raw_set_aio(&s
->aio_ctx
, &raw_s
->use_aio
, state
->flags
)) {
616 error_setg(errp
, "Could not set AIO state");
621 if (s
->type
== FTYPE_CD
) {
622 raw_s
->open_flags
|= O_NONBLOCK
;
625 raw_parse_flags(state
->flags
, &raw_s
->open_flags
);
629 int fcntl_flags
= O_APPEND
| O_NONBLOCK
;
631 fcntl_flags
|= O_NOATIME
;
635 /* Not all operating systems have O_ASYNC, and those that don't
636 * will not let us track the state into raw_s->open_flags (typically
637 * you achieve the same effect with an ioctl, for example I_SETSIG
638 * on Solaris). But we do not use O_ASYNC, so that's fine.
640 assert((s
->open_flags
& O_ASYNC
) == 0);
643 if ((raw_s
->open_flags
& ~fcntl_flags
) == (s
->open_flags
& ~fcntl_flags
)) {
644 /* dup the original fd */
645 /* TODO: use qemu fcntl wrapper */
646 #ifdef F_DUPFD_CLOEXEC
647 raw_s
->fd
= fcntl(s
->fd
, F_DUPFD_CLOEXEC
, 0);
649 raw_s
->fd
= dup(s
->fd
);
650 if (raw_s
->fd
!= -1) {
651 qemu_set_cloexec(raw_s
->fd
);
654 if (raw_s
->fd
>= 0) {
655 ret
= fcntl_setfl(raw_s
->fd
, raw_s
->open_flags
);
657 qemu_close(raw_s
->fd
);
663 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
664 if (raw_s
->fd
== -1) {
665 const char *normalized_filename
= state
->bs
->filename
;
666 ret
= raw_normalize_devicepath(&normalized_filename
);
668 error_setg_errno(errp
, -ret
, "Could not normalize device path");
670 assert(!(raw_s
->open_flags
& O_CREAT
));
671 raw_s
->fd
= qemu_open(normalized_filename
, raw_s
->open_flags
);
672 if (raw_s
->fd
== -1) {
673 error_setg_errno(errp
, errno
, "Could not reopen file");
679 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
680 * alignment with the new fd. */
681 if (raw_s
->fd
!= -1) {
682 raw_probe_alignment(state
->bs
, raw_s
->fd
, &local_err
);
684 qemu_close(raw_s
->fd
);
686 error_propagate(errp
, local_err
);
694 static void raw_reopen_commit(BDRVReopenState
*state
)
696 BDRVRawReopenState
*raw_s
= state
->opaque
;
697 BDRVRawState
*s
= state
->bs
->opaque
;
699 s
->open_flags
= raw_s
->open_flags
;
703 #ifdef CONFIG_LINUX_AIO
704 s
->use_aio
= raw_s
->use_aio
;
707 g_free(state
->opaque
);
708 state
->opaque
= NULL
;
712 static void raw_reopen_abort(BDRVReopenState
*state
)
714 BDRVRawReopenState
*raw_s
= state
->opaque
;
716 /* nothing to do if NULL, we didn't get far enough */
721 if (raw_s
->fd
>= 0) {
722 qemu_close(raw_s
->fd
);
725 g_free(state
->opaque
);
726 state
->opaque
= NULL
;
729 static void raw_refresh_limits(BlockDriverState
*bs
, Error
**errp
)
731 BDRVRawState
*s
= bs
->opaque
;
733 raw_probe_alignment(bs
, s
->fd
, errp
);
734 bs
->bl
.min_mem_alignment
= s
->buf_align
;
735 bs
->bl
.opt_mem_alignment
= MAX(s
->buf_align
, getpagesize());
738 static int check_for_dasd(int fd
)
741 struct dasd_information2_t info
= {0};
743 return ioctl(fd
, BIODASDINFO2
, &info
);
750 * Try to get @bs's logical and physical block size.
751 * On success, store them in @bsz and return zero.
752 * On failure, return negative errno.
754 static int hdev_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
)
756 BDRVRawState
*s
= bs
->opaque
;
759 /* If DASD, get blocksizes */
760 if (check_for_dasd(s
->fd
) < 0) {
763 ret
= probe_logical_blocksize(s
->fd
, &bsz
->log
);
767 return probe_physical_blocksize(s
->fd
, &bsz
->phys
);
771 * Try to get @bs's geometry: cyls, heads, sectors.
772 * On success, store them in @geo and return 0.
773 * On failure return -errno.
774 * (Allows block driver to assign default geometry values that guest sees)
777 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
779 BDRVRawState
*s
= bs
->opaque
;
780 struct hd_geometry ioctl_geo
= {0};
782 /* If DASD, get its geometry */
783 if (check_for_dasd(s
->fd
) < 0) {
786 if (ioctl(s
->fd
, HDIO_GETGEO
, &ioctl_geo
) < 0) {
789 /* HDIO_GETGEO may return success even though geo contains zeros
790 (e.g. certain multipath setups) */
791 if (!ioctl_geo
.heads
|| !ioctl_geo
.sectors
|| !ioctl_geo
.cylinders
) {
794 /* Do not return a geometry for partition */
795 if (ioctl_geo
.start
!= 0) {
798 geo
->heads
= ioctl_geo
.heads
;
799 geo
->sectors
= ioctl_geo
.sectors
;
800 geo
->cylinders
= ioctl_geo
.cylinders
;
804 #else /* __linux__ */
805 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
811 static ssize_t
handle_aiocb_ioctl(RawPosixAIOData
*aiocb
)
815 ret
= ioctl(aiocb
->aio_fildes
, aiocb
->aio_ioctl_cmd
, aiocb
->aio_ioctl_buf
);
823 static ssize_t
handle_aiocb_flush(RawPosixAIOData
*aiocb
)
827 ret
= qemu_fdatasync(aiocb
->aio_fildes
);
836 static bool preadv_present
= true;
839 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
841 return preadv(fd
, iov
, nr_iov
, offset
);
845 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
847 return pwritev(fd
, iov
, nr_iov
, offset
);
852 static bool preadv_present
= false;
855 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
861 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
868 static ssize_t
handle_aiocb_rw_vector(RawPosixAIOData
*aiocb
)
873 if (aiocb
->aio_type
& QEMU_AIO_WRITE
)
874 len
= qemu_pwritev(aiocb
->aio_fildes
,
879 len
= qemu_preadv(aiocb
->aio_fildes
,
883 } while (len
== -1 && errno
== EINTR
);
892 * Read/writes the data to/from a given linear buffer.
894 * Returns the number of bytes handles or -errno in case of an error. Short
895 * reads are only returned if the end of the file is reached.
897 static ssize_t
handle_aiocb_rw_linear(RawPosixAIOData
*aiocb
, char *buf
)
902 while (offset
< aiocb
->aio_nbytes
) {
903 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
904 len
= pwrite(aiocb
->aio_fildes
,
905 (const char *)buf
+ offset
,
906 aiocb
->aio_nbytes
- offset
,
907 aiocb
->aio_offset
+ offset
);
909 len
= pread(aiocb
->aio_fildes
,
911 aiocb
->aio_nbytes
- offset
,
912 aiocb
->aio_offset
+ offset
);
914 if (len
== -1 && errno
== EINTR
) {
916 } else if (len
== -1 && errno
== EINVAL
&&
917 (aiocb
->bs
->open_flags
& BDRV_O_NOCACHE
) &&
918 !(aiocb
->aio_type
& QEMU_AIO_WRITE
) &&
920 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
921 * after a short read. Assume that O_DIRECT short reads only occur
922 * at EOF. Therefore this is a short read, not an I/O error.
925 } else if (len
== -1) {
928 } else if (len
== 0) {
937 static ssize_t
handle_aiocb_rw(RawPosixAIOData
*aiocb
)
942 if (!(aiocb
->aio_type
& QEMU_AIO_MISALIGNED
)) {
944 * If there is just a single buffer, and it is properly aligned
945 * we can just use plain pread/pwrite without any problems.
947 if (aiocb
->aio_niov
== 1) {
948 return handle_aiocb_rw_linear(aiocb
, aiocb
->aio_iov
->iov_base
);
951 * We have more than one iovec, and all are properly aligned.
953 * Try preadv/pwritev first and fall back to linearizing the
954 * buffer if it's not supported.
956 if (preadv_present
) {
957 nbytes
= handle_aiocb_rw_vector(aiocb
);
958 if (nbytes
== aiocb
->aio_nbytes
||
959 (nbytes
< 0 && nbytes
!= -ENOSYS
)) {
962 preadv_present
= false;
966 * XXX(hch): short read/write. no easy way to handle the reminder
967 * using these interfaces. For now retry using plain
973 * Ok, we have to do it the hard way, copy all segments into
974 * a single aligned buffer.
976 buf
= qemu_try_blockalign(aiocb
->bs
, aiocb
->aio_nbytes
);
981 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
985 for (i
= 0; i
< aiocb
->aio_niov
; ++i
) {
986 memcpy(p
, aiocb
->aio_iov
[i
].iov_base
, aiocb
->aio_iov
[i
].iov_len
);
987 p
+= aiocb
->aio_iov
[i
].iov_len
;
989 assert(p
- buf
== aiocb
->aio_nbytes
);
992 nbytes
= handle_aiocb_rw_linear(aiocb
, buf
);
993 if (!(aiocb
->aio_type
& QEMU_AIO_WRITE
)) {
995 size_t count
= aiocb
->aio_nbytes
, copy
;
998 for (i
= 0; i
< aiocb
->aio_niov
&& count
; ++i
) {
1000 if (copy
> aiocb
->aio_iov
[i
].iov_len
) {
1001 copy
= aiocb
->aio_iov
[i
].iov_len
;
1003 memcpy(aiocb
->aio_iov
[i
].iov_base
, p
, copy
);
1004 assert(count
>= copy
);
1016 static int xfs_write_zeroes(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1018 struct xfs_flock64 fl
;
1021 memset(&fl
, 0, sizeof(fl
));
1022 fl
.l_whence
= SEEK_SET
;
1023 fl
.l_start
= offset
;
1026 if (xfsctl(NULL
, s
->fd
, XFS_IOC_ZERO_RANGE
, &fl
) < 0) {
1028 DPRINTF("cannot write zero range (%s)\n", strerror(errno
));
1035 static int xfs_discard(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1037 struct xfs_flock64 fl
;
1040 memset(&fl
, 0, sizeof(fl
));
1041 fl
.l_whence
= SEEK_SET
;
1042 fl
.l_start
= offset
;
1045 if (xfsctl(NULL
, s
->fd
, XFS_IOC_UNRESVSP64
, &fl
) < 0) {
1047 DPRINTF("cannot punch hole (%s)\n", strerror(errno
));
1055 static int translate_err(int err
)
1057 if (err
== -ENODEV
|| err
== -ENOSYS
|| err
== -EOPNOTSUPP
||
1064 #ifdef CONFIG_FALLOCATE
1065 static int do_fallocate(int fd
, int mode
, off_t offset
, off_t len
)
1068 if (fallocate(fd
, mode
, offset
, len
) == 0) {
1071 } while (errno
== EINTR
);
1072 return translate_err(-errno
);
1076 static ssize_t
handle_aiocb_write_zeroes_block(RawPosixAIOData
*aiocb
)
1079 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1081 if (!s
->has_write_zeroes
) {
1087 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1088 if (ioctl(aiocb
->aio_fildes
, BLKZEROOUT
, range
) == 0) {
1091 } while (errno
== EINTR
);
1093 ret
= translate_err(-errno
);
1096 if (ret
== -ENOTSUP
) {
1097 s
->has_write_zeroes
= false;
1102 static ssize_t
handle_aiocb_write_zeroes(RawPosixAIOData
*aiocb
)
1104 #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
1105 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1108 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1109 return handle_aiocb_write_zeroes_block(aiocb
);
1114 return xfs_write_zeroes(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1118 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1119 if (s
->has_write_zeroes
) {
1120 int ret
= do_fallocate(s
->fd
, FALLOC_FL_ZERO_RANGE
,
1121 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1122 if (ret
== 0 || ret
!= -ENOTSUP
) {
1125 s
->has_write_zeroes
= false;
1129 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1130 if (s
->has_discard
&& s
->has_fallocate
) {
1131 int ret
= do_fallocate(s
->fd
,
1132 FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1133 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1135 ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1136 if (ret
== 0 || ret
!= -ENOTSUP
) {
1139 s
->has_fallocate
= false;
1140 } else if (ret
!= -ENOTSUP
) {
1143 s
->has_discard
= false;
1148 #ifdef CONFIG_FALLOCATE
1149 if (s
->has_fallocate
&& aiocb
->aio_offset
>= bdrv_getlength(aiocb
->bs
)) {
1150 int ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1151 if (ret
== 0 || ret
!= -ENOTSUP
) {
1154 s
->has_fallocate
= false;
1161 static ssize_t
handle_aiocb_discard(RawPosixAIOData
*aiocb
)
1163 int ret
= -EOPNOTSUPP
;
1164 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1166 if (!s
->has_discard
) {
1170 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1173 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1174 if (ioctl(aiocb
->aio_fildes
, BLKDISCARD
, range
) == 0) {
1177 } while (errno
== EINTR
);
1184 return xfs_discard(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1188 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1189 ret
= do_fallocate(s
->fd
, FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1190 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1194 ret
= translate_err(ret
);
1195 if (ret
== -ENOTSUP
) {
1196 s
->has_discard
= false;
1201 static int aio_worker(void *arg
)
1203 RawPosixAIOData
*aiocb
= arg
;
1206 switch (aiocb
->aio_type
& QEMU_AIO_TYPE_MASK
) {
1208 ret
= handle_aiocb_rw(aiocb
);
1209 if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1210 iov_memset(aiocb
->aio_iov
, aiocb
->aio_niov
, ret
,
1211 0, aiocb
->aio_nbytes
- ret
);
1213 ret
= aiocb
->aio_nbytes
;
1215 if (ret
== aiocb
->aio_nbytes
) {
1217 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1221 case QEMU_AIO_WRITE
:
1222 ret
= handle_aiocb_rw(aiocb
);
1223 if (ret
== aiocb
->aio_nbytes
) {
1225 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1229 case QEMU_AIO_FLUSH
:
1230 ret
= handle_aiocb_flush(aiocb
);
1232 case QEMU_AIO_IOCTL
:
1233 ret
= handle_aiocb_ioctl(aiocb
);
1235 case QEMU_AIO_DISCARD
:
1236 ret
= handle_aiocb_discard(aiocb
);
1238 case QEMU_AIO_WRITE_ZEROES
:
1239 ret
= handle_aiocb_write_zeroes(aiocb
);
1242 fprintf(stderr
, "invalid aio request (0x%x)\n", aiocb
->aio_type
);
1251 static int paio_submit_co(BlockDriverState
*bs
, int fd
,
1252 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
1255 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1259 acb
->aio_type
= type
;
1260 acb
->aio_fildes
= fd
;
1262 acb
->aio_nbytes
= nb_sectors
* BDRV_SECTOR_SIZE
;
1263 acb
->aio_offset
= sector_num
* BDRV_SECTOR_SIZE
;
1266 acb
->aio_iov
= qiov
->iov
;
1267 acb
->aio_niov
= qiov
->niov
;
1268 assert(qiov
->size
== acb
->aio_nbytes
);
1271 trace_paio_submit_co(sector_num
, nb_sectors
, type
);
1272 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1273 return thread_pool_submit_co(pool
, aio_worker
, acb
);
1276 static BlockAIOCB
*paio_submit(BlockDriverState
*bs
, int fd
,
1277 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
1278 BlockCompletionFunc
*cb
, void *opaque
, int type
)
1280 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1284 acb
->aio_type
= type
;
1285 acb
->aio_fildes
= fd
;
1287 acb
->aio_nbytes
= nb_sectors
* BDRV_SECTOR_SIZE
;
1288 acb
->aio_offset
= sector_num
* BDRV_SECTOR_SIZE
;
1291 acb
->aio_iov
= qiov
->iov
;
1292 acb
->aio_niov
= qiov
->niov
;
1293 assert(qiov
->size
== acb
->aio_nbytes
);
1296 trace_paio_submit(acb
, opaque
, sector_num
, nb_sectors
, type
);
1297 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1298 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
1301 static BlockAIOCB
*raw_aio_submit(BlockDriverState
*bs
,
1302 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
1303 BlockCompletionFunc
*cb
, void *opaque
, int type
)
1305 BDRVRawState
*s
= bs
->opaque
;
1307 if (fd_open(bs
) < 0)
1311 * Check if the underlying device requires requests to be aligned,
1312 * and if the request we are trying to submit is aligned or not.
1313 * If this is the case tell the low-level driver that it needs
1314 * to copy the buffer.
1316 if (s
->needs_alignment
) {
1317 if (!bdrv_qiov_is_aligned(bs
, qiov
)) {
1318 type
|= QEMU_AIO_MISALIGNED
;
1319 #ifdef CONFIG_LINUX_AIO
1320 } else if (s
->use_aio
) {
1321 return laio_submit(bs
, s
->aio_ctx
, s
->fd
, sector_num
, qiov
,
1322 nb_sectors
, cb
, opaque
, type
);
1327 return paio_submit(bs
, s
->fd
, sector_num
, qiov
, nb_sectors
,
1331 static void raw_aio_plug(BlockDriverState
*bs
)
1333 #ifdef CONFIG_LINUX_AIO
1334 BDRVRawState
*s
= bs
->opaque
;
1336 laio_io_plug(bs
, s
->aio_ctx
);
1341 static void raw_aio_unplug(BlockDriverState
*bs
)
1343 #ifdef CONFIG_LINUX_AIO
1344 BDRVRawState
*s
= bs
->opaque
;
1346 laio_io_unplug(bs
, s
->aio_ctx
, true);
1351 static void raw_aio_flush_io_queue(BlockDriverState
*bs
)
1353 #ifdef CONFIG_LINUX_AIO
1354 BDRVRawState
*s
= bs
->opaque
;
1356 laio_io_unplug(bs
, s
->aio_ctx
, false);
1361 static BlockAIOCB
*raw_aio_readv(BlockDriverState
*bs
,
1362 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
1363 BlockCompletionFunc
*cb
, void *opaque
)
1365 return raw_aio_submit(bs
, sector_num
, qiov
, nb_sectors
,
1366 cb
, opaque
, QEMU_AIO_READ
);
1369 static BlockAIOCB
*raw_aio_writev(BlockDriverState
*bs
,
1370 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
1371 BlockCompletionFunc
*cb
, void *opaque
)
1373 return raw_aio_submit(bs
, sector_num
, qiov
, nb_sectors
,
1374 cb
, opaque
, QEMU_AIO_WRITE
);
1377 static BlockAIOCB
*raw_aio_flush(BlockDriverState
*bs
,
1378 BlockCompletionFunc
*cb
, void *opaque
)
1380 BDRVRawState
*s
= bs
->opaque
;
1382 if (fd_open(bs
) < 0)
1385 return paio_submit(bs
, s
->fd
, 0, NULL
, 0, cb
, opaque
, QEMU_AIO_FLUSH
);
1388 static void raw_close(BlockDriverState
*bs
)
1390 BDRVRawState
*s
= bs
->opaque
;
1392 raw_detach_aio_context(bs
);
1394 #ifdef CONFIG_LINUX_AIO
1396 laio_cleanup(s
->aio_ctx
);
1405 static int raw_truncate(BlockDriverState
*bs
, int64_t offset
)
1407 BDRVRawState
*s
= bs
->opaque
;
1410 if (fstat(s
->fd
, &st
)) {
1414 if (S_ISREG(st
.st_mode
)) {
1415 if (ftruncate(s
->fd
, offset
) < 0) {
1418 } else if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1419 if (offset
> raw_getlength(bs
)) {
1430 static int64_t raw_getlength(BlockDriverState
*bs
)
1432 BDRVRawState
*s
= bs
->opaque
;
1438 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1439 struct disklabel dl
;
1441 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1443 return (uint64_t)dl
.d_secsize
*
1444 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1448 #elif defined(__NetBSD__)
1449 static int64_t raw_getlength(BlockDriverState
*bs
)
1451 BDRVRawState
*s
= bs
->opaque
;
1457 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1458 struct dkwedge_info dkw
;
1460 if (ioctl(fd
, DIOCGWEDGEINFO
, &dkw
) != -1) {
1461 return dkw
.dkw_size
* 512;
1463 struct disklabel dl
;
1465 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1467 return (uint64_t)dl
.d_secsize
*
1468 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1473 #elif defined(__sun__)
1474 static int64_t raw_getlength(BlockDriverState
*bs
)
1476 BDRVRawState
*s
= bs
->opaque
;
1477 struct dk_minfo minfo
;
1487 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1489 ret
= ioctl(s
->fd
, DKIOCGMEDIAINFO
, &minfo
);
1491 return minfo
.dki_lbsize
* minfo
.dki_capacity
;
1495 * There are reports that lseek on some devices fails, but
1496 * irc discussion said that contingency on contingency was overkill.
1498 size
= lseek(s
->fd
, 0, SEEK_END
);
1504 #elif defined(CONFIG_BSD)
1505 static int64_t raw_getlength(BlockDriverState
*bs
)
1507 BDRVRawState
*s
= bs
->opaque
;
1511 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1520 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1523 if (!fstat(fd
, &sb
) && (S_IFCHR
& sb
.st_mode
)) {
1524 #ifdef DIOCGMEDIASIZE
1525 if (ioctl(fd
, DIOCGMEDIASIZE
, (off_t
*)&size
))
1526 #elif defined(DIOCGPART)
1529 if (ioctl(fd
, DIOCGPART
, &pi
) == 0)
1530 size
= pi
.media_size
;
1536 #if defined(__APPLE__) && defined(__MACH__)
1538 uint64_t sectors
= 0;
1539 uint32_t sector_size
= 0;
1541 if (ioctl(fd
, DKIOCGETBLOCKCOUNT
, §ors
) == 0
1542 && ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) == 0) {
1543 size
= sectors
* sector_size
;
1545 size
= lseek(fd
, 0LL, SEEK_END
);
1552 size
= lseek(fd
, 0LL, SEEK_END
);
1557 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1560 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1561 if (size
== 2048LL * (unsigned)-1)
1563 /* XXX no disc? maybe we need to reopen... */
1564 if (size
<= 0 && !reopened
&& cdrom_reopen(bs
) >= 0) {
1571 size
= lseek(fd
, 0, SEEK_END
);
1579 static int64_t raw_getlength(BlockDriverState
*bs
)
1581 BDRVRawState
*s
= bs
->opaque
;
1590 size
= lseek(s
->fd
, 0, SEEK_END
);
1598 static int64_t raw_get_allocated_file_size(BlockDriverState
*bs
)
1601 BDRVRawState
*s
= bs
->opaque
;
1603 if (fstat(s
->fd
, &st
) < 0) {
1606 return (int64_t)st
.st_blocks
* 512;
1609 static int raw_create(const char *filename
, QemuOpts
*opts
, Error
**errp
)
1613 int64_t total_size
= 0;
1615 PreallocMode prealloc
;
1617 Error
*local_err
= NULL
;
1619 strstart(filename
, "file:", &filename
);
1621 /* Read out options */
1622 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
1624 nocow
= qemu_opt_get_bool(opts
, BLOCK_OPT_NOCOW
, false);
1625 buf
= qemu_opt_get_del(opts
, BLOCK_OPT_PREALLOC
);
1626 prealloc
= qapi_enum_parse(PreallocMode_lookup
, buf
,
1627 PREALLOC_MODE__MAX
, PREALLOC_MODE_OFF
,
1631 error_propagate(errp
, local_err
);
1636 fd
= qemu_open(filename
, O_RDWR
| O_CREAT
| O_TRUNC
| O_BINARY
,
1640 error_setg_errno(errp
, -result
, "Could not create file");
1646 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1647 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1648 * will be ignored since any failure of this operation should not
1649 * block the left work.
1652 if (ioctl(fd
, FS_IOC_GETFLAGS
, &attr
) == 0) {
1653 attr
|= FS_NOCOW_FL
;
1654 ioctl(fd
, FS_IOC_SETFLAGS
, &attr
);
1659 if (ftruncate(fd
, total_size
) != 0) {
1661 error_setg_errno(errp
, -result
, "Could not resize file");
1666 #ifdef CONFIG_POSIX_FALLOCATE
1667 case PREALLOC_MODE_FALLOC
:
1668 /* posix_fallocate() doesn't set errno. */
1669 result
= -posix_fallocate(fd
, 0, total_size
);
1671 error_setg_errno(errp
, -result
,
1672 "Could not preallocate data for the new file");
1676 case PREALLOC_MODE_FULL
:
1678 int64_t num
= 0, left
= total_size
;
1679 buf
= g_malloc0(65536);
1682 num
= MIN(left
, 65536);
1683 result
= write(fd
, buf
, num
);
1686 error_setg_errno(errp
, -result
,
1687 "Could not write to the new file");
1696 error_setg_errno(errp
, -result
,
1697 "Could not flush new file to disk");
1703 case PREALLOC_MODE_OFF
:
1707 error_setg(errp
, "Unsupported preallocation mode: %s",
1708 PreallocMode_lookup
[prealloc
]);
1713 if (qemu_close(fd
) != 0 && result
== 0) {
1715 error_setg_errno(errp
, -result
, "Could not close the new file");
1722 * Find allocation range in @bs around offset @start.
1723 * May change underlying file descriptor's file offset.
1724 * If @start is not in a hole, store @start in @data, and the
1725 * beginning of the next hole in @hole, and return 0.
1726 * If @start is in a non-trailing hole, store @start in @hole and the
1727 * beginning of the next non-hole in @data, and return 0.
1728 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1729 * If we can't find out, return a negative errno other than -ENXIO.
1731 static int find_allocation(BlockDriverState
*bs
, off_t start
,
1732 off_t
*data
, off_t
*hole
)
1734 #if defined SEEK_HOLE && defined SEEK_DATA
1735 BDRVRawState
*s
= bs
->opaque
;
1740 * D1. offs == start: start is in data
1741 * D2. offs > start: start is in a hole, next data at offs
1742 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1743 * or start is beyond EOF
1744 * If the latter happens, the file has been truncated behind
1745 * our back since we opened it. All bets are off then.
1746 * Treating like a trailing hole is simplest.
1747 * D4. offs < 0, errno != ENXIO: we learned nothing
1749 offs
= lseek(s
->fd
, start
, SEEK_DATA
);
1751 return -errno
; /* D3 or D4 */
1753 assert(offs
>= start
);
1756 /* D2: in hole, next data at offs */
1762 /* D1: in data, end not yet known */
1766 * H1. offs == start: start is in a hole
1767 * If this happens here, a hole has been dug behind our back
1768 * since the previous lseek().
1769 * H2. offs > start: either start is in data, next hole at offs,
1770 * or start is in trailing hole, EOF at offs
1771 * Linux treats trailing holes like any other hole: offs ==
1772 * start. Solaris seeks to EOF instead: offs > start (blech).
1773 * If that happens here, a hole has been dug behind our back
1774 * since the previous lseek().
1775 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1776 * If this happens, the file has been truncated behind our
1777 * back since we opened it. Treat it like a trailing hole.
1778 * H4. offs < 0, errno != ENXIO: we learned nothing
1779 * Pretend we know nothing at all, i.e. "forget" about D1.
1781 offs
= lseek(s
->fd
, start
, SEEK_HOLE
);
1783 return -errno
; /* D1 and (H3 or H4) */
1785 assert(offs
>= start
);
1789 * D1 and H2: either in data, next hole at offs, or it was in
1790 * data but is now in a trailing hole. In the latter case,
1791 * all bets are off. Treating it as if it there was data all
1792 * the way to EOF is safe, so simply do that.
1807 * Returns the allocation status of the specified sectors.
1809 * If 'sector_num' is beyond the end of the disk image the return value is 0
1810 * and 'pnum' is set to 0.
1812 * 'pnum' is set to the number of sectors (including and immediately following
1813 * the specified sector) that are known to be in the same
1814 * allocated/unallocated state.
1816 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
1817 * beyond the end of the disk image it will be clamped.
1819 static int64_t coroutine_fn
raw_co_get_block_status(BlockDriverState
*bs
,
1821 int nb_sectors
, int *pnum
,
1822 BlockDriverState
**file
)
1824 off_t start
, data
= 0, hole
= 0;
1833 start
= sector_num
* BDRV_SECTOR_SIZE
;
1834 total_size
= bdrv_getlength(bs
);
1835 if (total_size
< 0) {
1837 } else if (start
>= total_size
) {
1840 } else if (start
+ nb_sectors
* BDRV_SECTOR_SIZE
> total_size
) {
1841 nb_sectors
= DIV_ROUND_UP(total_size
- start
, BDRV_SECTOR_SIZE
);
1844 ret
= find_allocation(bs
, start
, &data
, &hole
);
1845 if (ret
== -ENXIO
) {
1848 ret
= BDRV_BLOCK_ZERO
;
1849 } else if (ret
< 0) {
1850 /* No info available, so pretend there are no holes */
1852 ret
= BDRV_BLOCK_DATA
;
1853 } else if (data
== start
) {
1854 /* On a data extent, compute sectors to the end of the extent,
1855 * possibly including a partial sector at EOF. */
1856 *pnum
= MIN(nb_sectors
, DIV_ROUND_UP(hole
- start
, BDRV_SECTOR_SIZE
));
1857 ret
= BDRV_BLOCK_DATA
;
1859 /* On a hole, compute sectors to the beginning of the next extent. */
1860 assert(hole
== start
);
1861 *pnum
= MIN(nb_sectors
, (data
- start
) / BDRV_SECTOR_SIZE
);
1862 ret
= BDRV_BLOCK_ZERO
;
1864 return ret
| BDRV_BLOCK_OFFSET_VALID
| start
;
1867 static coroutine_fn BlockAIOCB
*raw_aio_discard(BlockDriverState
*bs
,
1868 int64_t sector_num
, int nb_sectors
,
1869 BlockCompletionFunc
*cb
, void *opaque
)
1871 BDRVRawState
*s
= bs
->opaque
;
1873 return paio_submit(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
1874 cb
, opaque
, QEMU_AIO_DISCARD
);
1877 static int coroutine_fn
raw_co_write_zeroes(
1878 BlockDriverState
*bs
, int64_t sector_num
,
1879 int nb_sectors
, BdrvRequestFlags flags
)
1881 BDRVRawState
*s
= bs
->opaque
;
1883 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
1884 return paio_submit_co(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
1885 QEMU_AIO_WRITE_ZEROES
);
1886 } else if (s
->discard_zeroes
) {
1887 return paio_submit_co(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
1893 static int raw_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
1895 BDRVRawState
*s
= bs
->opaque
;
1897 bdi
->unallocated_blocks_are_zero
= s
->discard_zeroes
;
1898 bdi
->can_write_zeroes_with_unmap
= s
->discard_zeroes
;
1902 static QemuOptsList raw_create_opts
= {
1903 .name
= "raw-create-opts",
1904 .head
= QTAILQ_HEAD_INITIALIZER(raw_create_opts
.head
),
1907 .name
= BLOCK_OPT_SIZE
,
1908 .type
= QEMU_OPT_SIZE
,
1909 .help
= "Virtual disk size"
1912 .name
= BLOCK_OPT_NOCOW
,
1913 .type
= QEMU_OPT_BOOL
,
1914 .help
= "Turn off copy-on-write (valid only on btrfs)"
1917 .name
= BLOCK_OPT_PREALLOC
,
1918 .type
= QEMU_OPT_STRING
,
1919 .help
= "Preallocation mode (allowed values: off, falloc, full)"
1921 { /* end of list */ }
1925 BlockDriver bdrv_file
= {
1926 .format_name
= "file",
1927 .protocol_name
= "file",
1928 .instance_size
= sizeof(BDRVRawState
),
1929 .bdrv_needs_filename
= true,
1930 .bdrv_probe
= NULL
, /* no probe for protocols */
1931 .bdrv_parse_filename
= raw_parse_filename
,
1932 .bdrv_file_open
= raw_open
,
1933 .bdrv_reopen_prepare
= raw_reopen_prepare
,
1934 .bdrv_reopen_commit
= raw_reopen_commit
,
1935 .bdrv_reopen_abort
= raw_reopen_abort
,
1936 .bdrv_close
= raw_close
,
1937 .bdrv_create
= raw_create
,
1938 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
1939 .bdrv_co_get_block_status
= raw_co_get_block_status
,
1940 .bdrv_co_write_zeroes
= raw_co_write_zeroes
,
1942 .bdrv_aio_readv
= raw_aio_readv
,
1943 .bdrv_aio_writev
= raw_aio_writev
,
1944 .bdrv_aio_flush
= raw_aio_flush
,
1945 .bdrv_aio_discard
= raw_aio_discard
,
1946 .bdrv_refresh_limits
= raw_refresh_limits
,
1947 .bdrv_io_plug
= raw_aio_plug
,
1948 .bdrv_io_unplug
= raw_aio_unplug
,
1949 .bdrv_flush_io_queue
= raw_aio_flush_io_queue
,
1951 .bdrv_truncate
= raw_truncate
,
1952 .bdrv_getlength
= raw_getlength
,
1953 .bdrv_get_info
= raw_get_info
,
1954 .bdrv_get_allocated_file_size
1955 = raw_get_allocated_file_size
,
1957 .bdrv_detach_aio_context
= raw_detach_aio_context
,
1958 .bdrv_attach_aio_context
= raw_attach_aio_context
,
1960 .create_opts
= &raw_create_opts
,
1963 /***********************************************/
1966 #if defined(__APPLE__) && defined(__MACH__)
1967 static kern_return_t
FindEjectableCDMedia( io_iterator_t
*mediaIterator
);
1968 static kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
1969 CFIndex maxPathSize
, int flags
);
1970 kern_return_t
FindEjectableCDMedia( io_iterator_t
*mediaIterator
)
1972 kern_return_t kernResult
;
1973 mach_port_t masterPort
;
1974 CFMutableDictionaryRef classesToMatch
;
1976 kernResult
= IOMasterPort( MACH_PORT_NULL
, &masterPort
);
1977 if ( KERN_SUCCESS
!= kernResult
) {
1978 printf( "IOMasterPort returned %d\n", kernResult
);
1981 classesToMatch
= IOServiceMatching( kIOCDMediaClass
);
1982 if ( classesToMatch
== NULL
) {
1983 printf( "IOServiceMatching returned a NULL dictionary.\n" );
1985 CFDictionarySetValue( classesToMatch
, CFSTR( kIOMediaEjectableKey
), kCFBooleanTrue
);
1987 kernResult
= IOServiceGetMatchingServices( masterPort
, classesToMatch
, mediaIterator
);
1988 if ( KERN_SUCCESS
!= kernResult
)
1990 printf( "IOServiceGetMatchingServices returned %d\n", kernResult
);
1996 kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
1997 CFIndex maxPathSize
, int flags
)
1999 io_object_t nextMedia
;
2000 kern_return_t kernResult
= KERN_FAILURE
;
2002 nextMedia
= IOIteratorNext( mediaIterator
);
2005 CFTypeRef bsdPathAsCFString
;
2006 bsdPathAsCFString
= IORegistryEntryCreateCFProperty( nextMedia
, CFSTR( kIOBSDNameKey
), kCFAllocatorDefault
, 0 );
2007 if ( bsdPathAsCFString
) {
2008 size_t devPathLength
;
2009 strcpy( bsdPath
, _PATH_DEV
);
2010 if (flags
& BDRV_O_NOCACHE
) {
2011 strcat(bsdPath
, "r");
2013 devPathLength
= strlen( bsdPath
);
2014 if ( CFStringGetCString( bsdPathAsCFString
, bsdPath
+ devPathLength
, maxPathSize
- devPathLength
, kCFStringEncodingASCII
) ) {
2015 kernResult
= KERN_SUCCESS
;
2017 CFRelease( bsdPathAsCFString
);
2019 IOObjectRelease( nextMedia
);
2027 static int hdev_probe_device(const char *filename
)
2031 /* allow a dedicated CD-ROM driver to match with a higher priority */
2032 if (strstart(filename
, "/dev/cdrom", NULL
))
2035 if (stat(filename
, &st
) >= 0 &&
2036 (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
))) {
2043 static int check_hdev_writable(BDRVRawState
*s
)
2045 #if defined(BLKROGET)
2046 /* Linux block devices can be configured "read-only" using blockdev(8).
2047 * This is independent of device node permissions and therefore open(2)
2048 * with O_RDWR succeeds. Actual writes fail with EPERM.
2050 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
2051 * check for read-only block devices so that Linux block devices behave
2057 if (fstat(s
->fd
, &st
)) {
2061 if (!S_ISBLK(st
.st_mode
)) {
2065 if (ioctl(s
->fd
, BLKROGET
, &readonly
) < 0) {
2072 #endif /* defined(BLKROGET) */
2076 static void hdev_parse_filename(const char *filename
, QDict
*options
,
2079 /* The prefix is optional, just as for "file". */
2080 strstart(filename
, "host_device:", &filename
);
2082 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
2085 static bool hdev_is_sg(BlockDriverState
*bs
)
2088 #if defined(__linux__)
2091 struct sg_scsi_id scsiid
;
2094 if (stat(bs
->filename
, &st
) >= 0 && S_ISCHR(st
.st_mode
) &&
2095 !bdrv_ioctl(bs
, SG_GET_VERSION_NUM
, &sg_version
) &&
2096 !bdrv_ioctl(bs
, SG_GET_SCSI_ID
, &scsiid
)) {
2097 DPRINTF("SG device found: type=%d, version=%d\n",
2098 scsiid
.scsi_type
, sg_version
);
2107 static int hdev_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2110 BDRVRawState
*s
= bs
->opaque
;
2111 Error
*local_err
= NULL
;
2114 #if defined(__APPLE__) && defined(__MACH__)
2115 const char *filename
= qdict_get_str(options
, "filename");
2117 if (strstart(filename
, "/dev/cdrom", NULL
)) {
2118 kern_return_t kernResult
;
2119 io_iterator_t mediaIterator
;
2120 char bsdPath
[ MAXPATHLEN
];
2123 kernResult
= FindEjectableCDMedia( &mediaIterator
);
2124 kernResult
= GetBSDPath(mediaIterator
, bsdPath
, sizeof(bsdPath
),
2126 if ( bsdPath
[ 0 ] != '\0' ) {
2127 strcat(bsdPath
,"s0");
2128 /* some CDs don't have a partition 0 */
2129 fd
= qemu_open(bsdPath
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
2131 bsdPath
[strlen(bsdPath
)-1] = '1';
2136 qdict_put(options
, "filename", qstring_from_str(filename
));
2139 if ( mediaIterator
)
2140 IOObjectRelease( mediaIterator
);
2144 s
->type
= FTYPE_FILE
;
2146 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2149 error_propagate(errp
, local_err
);
2154 /* Since this does ioctl the device must be already opened */
2155 bs
->sg
= hdev_is_sg(bs
);
2157 if (flags
& BDRV_O_RDWR
) {
2158 ret
= check_hdev_writable(s
);
2161 error_setg_errno(errp
, -ret
, "The device is not writable");
2169 #if defined(__linux__)
2171 static BlockAIOCB
*hdev_aio_ioctl(BlockDriverState
*bs
,
2172 unsigned long int req
, void *buf
,
2173 BlockCompletionFunc
*cb
, void *opaque
)
2175 BDRVRawState
*s
= bs
->opaque
;
2176 RawPosixAIOData
*acb
;
2179 if (fd_open(bs
) < 0)
2182 acb
= g_new(RawPosixAIOData
, 1);
2184 acb
->aio_type
= QEMU_AIO_IOCTL
;
2185 acb
->aio_fildes
= s
->fd
;
2186 acb
->aio_offset
= 0;
2187 acb
->aio_ioctl_buf
= buf
;
2188 acb
->aio_ioctl_cmd
= req
;
2189 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
2190 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
2194 static int fd_open(BlockDriverState
*bs
)
2196 BDRVRawState
*s
= bs
->opaque
;
2198 /* this is just to ensure s->fd is sane (its called by io ops) */
2204 static coroutine_fn BlockAIOCB
*hdev_aio_discard(BlockDriverState
*bs
,
2205 int64_t sector_num
, int nb_sectors
,
2206 BlockCompletionFunc
*cb
, void *opaque
)
2208 BDRVRawState
*s
= bs
->opaque
;
2210 if (fd_open(bs
) < 0) {
2213 return paio_submit(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
2214 cb
, opaque
, QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2217 static coroutine_fn
int hdev_co_write_zeroes(BlockDriverState
*bs
,
2218 int64_t sector_num
, int nb_sectors
, BdrvRequestFlags flags
)
2220 BDRVRawState
*s
= bs
->opaque
;
2227 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
2228 return paio_submit_co(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
2229 QEMU_AIO_WRITE_ZEROES
|QEMU_AIO_BLKDEV
);
2230 } else if (s
->discard_zeroes
) {
2231 return paio_submit_co(bs
, s
->fd
, sector_num
, NULL
, nb_sectors
,
2232 QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2237 static int hdev_create(const char *filename
, QemuOpts
*opts
,
2242 struct stat stat_buf
;
2243 int64_t total_size
= 0;
2246 /* This function is used by both protocol block drivers and therefore either
2247 * of these prefixes may be given.
2248 * The return value has to be stored somewhere, otherwise this is an error
2249 * due to -Werror=unused-value. */
2251 strstart(filename
, "host_device:", &filename
) ||
2252 strstart(filename
, "host_cdrom:" , &filename
);
2256 ret
= raw_normalize_devicepath(&filename
);
2258 error_setg_errno(errp
, -ret
, "Could not normalize device path");
2262 /* Read out options */
2263 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
2266 fd
= qemu_open(filename
, O_WRONLY
| O_BINARY
);
2269 error_setg_errno(errp
, -ret
, "Could not open device");
2273 if (fstat(fd
, &stat_buf
) < 0) {
2275 error_setg_errno(errp
, -ret
, "Could not stat device");
2276 } else if (!S_ISBLK(stat_buf
.st_mode
) && !S_ISCHR(stat_buf
.st_mode
)) {
2278 "The given file is neither a block nor a character device");
2280 } else if (lseek(fd
, 0, SEEK_END
) < total_size
) {
2281 error_setg(errp
, "Device is too small");
2289 static BlockDriver bdrv_host_device
= {
2290 .format_name
= "host_device",
2291 .protocol_name
= "host_device",
2292 .instance_size
= sizeof(BDRVRawState
),
2293 .bdrv_needs_filename
= true,
2294 .bdrv_probe_device
= hdev_probe_device
,
2295 .bdrv_parse_filename
= hdev_parse_filename
,
2296 .bdrv_file_open
= hdev_open
,
2297 .bdrv_close
= raw_close
,
2298 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2299 .bdrv_reopen_commit
= raw_reopen_commit
,
2300 .bdrv_reopen_abort
= raw_reopen_abort
,
2301 .bdrv_create
= hdev_create
,
2302 .create_opts
= &raw_create_opts
,
2303 .bdrv_co_write_zeroes
= hdev_co_write_zeroes
,
2305 .bdrv_aio_readv
= raw_aio_readv
,
2306 .bdrv_aio_writev
= raw_aio_writev
,
2307 .bdrv_aio_flush
= raw_aio_flush
,
2308 .bdrv_aio_discard
= hdev_aio_discard
,
2309 .bdrv_refresh_limits
= raw_refresh_limits
,
2310 .bdrv_io_plug
= raw_aio_plug
,
2311 .bdrv_io_unplug
= raw_aio_unplug
,
2312 .bdrv_flush_io_queue
= raw_aio_flush_io_queue
,
2314 .bdrv_truncate
= raw_truncate
,
2315 .bdrv_getlength
= raw_getlength
,
2316 .bdrv_get_info
= raw_get_info
,
2317 .bdrv_get_allocated_file_size
2318 = raw_get_allocated_file_size
,
2319 .bdrv_probe_blocksizes
= hdev_probe_blocksizes
,
2320 .bdrv_probe_geometry
= hdev_probe_geometry
,
2322 .bdrv_detach_aio_context
= raw_detach_aio_context
,
2323 .bdrv_attach_aio_context
= raw_attach_aio_context
,
2325 /* generic scsi device */
2327 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2331 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2332 static void cdrom_parse_filename(const char *filename
, QDict
*options
,
2335 /* The prefix is optional, just as for "file". */
2336 strstart(filename
, "host_cdrom:", &filename
);
2338 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
2343 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2346 BDRVRawState
*s
= bs
->opaque
;
2347 Error
*local_err
= NULL
;
2352 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2353 ret
= raw_open_common(bs
, options
, flags
, O_NONBLOCK
, &local_err
);
2355 error_propagate(errp
, local_err
);
2360 static int cdrom_probe_device(const char *filename
)
2366 fd
= qemu_open(filename
, O_RDONLY
| O_NONBLOCK
);
2370 ret
= fstat(fd
, &st
);
2371 if (ret
== -1 || !S_ISBLK(st
.st_mode
)) {
2375 /* Attempt to detect via a CDROM specific ioctl */
2376 ret
= ioctl(fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2386 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2388 BDRVRawState
*s
= bs
->opaque
;
2391 ret
= ioctl(s
->fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2392 return ret
== CDS_DISC_OK
;
2395 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2397 BDRVRawState
*s
= bs
->opaque
;
2400 if (ioctl(s
->fd
, CDROMEJECT
, NULL
) < 0)
2401 perror("CDROMEJECT");
2403 if (ioctl(s
->fd
, CDROMCLOSETRAY
, NULL
) < 0)
2404 perror("CDROMEJECT");
2408 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2410 BDRVRawState
*s
= bs
->opaque
;
2412 if (ioctl(s
->fd
, CDROM_LOCKDOOR
, locked
) < 0) {
2414 * Note: an error can happen if the distribution automatically
2417 /* perror("CDROM_LOCKDOOR"); */
2421 static BlockDriver bdrv_host_cdrom
= {
2422 .format_name
= "host_cdrom",
2423 .protocol_name
= "host_cdrom",
2424 .instance_size
= sizeof(BDRVRawState
),
2425 .bdrv_needs_filename
= true,
2426 .bdrv_probe_device
= cdrom_probe_device
,
2427 .bdrv_parse_filename
= cdrom_parse_filename
,
2428 .bdrv_file_open
= cdrom_open
,
2429 .bdrv_close
= raw_close
,
2430 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2431 .bdrv_reopen_commit
= raw_reopen_commit
,
2432 .bdrv_reopen_abort
= raw_reopen_abort
,
2433 .bdrv_create
= hdev_create
,
2434 .create_opts
= &raw_create_opts
,
2436 .bdrv_aio_readv
= raw_aio_readv
,
2437 .bdrv_aio_writev
= raw_aio_writev
,
2438 .bdrv_aio_flush
= raw_aio_flush
,
2439 .bdrv_refresh_limits
= raw_refresh_limits
,
2440 .bdrv_io_plug
= raw_aio_plug
,
2441 .bdrv_io_unplug
= raw_aio_unplug
,
2442 .bdrv_flush_io_queue
= raw_aio_flush_io_queue
,
2444 .bdrv_truncate
= raw_truncate
,
2445 .bdrv_getlength
= raw_getlength
,
2446 .has_variable_length
= true,
2447 .bdrv_get_allocated_file_size
2448 = raw_get_allocated_file_size
,
2450 .bdrv_detach_aio_context
= raw_detach_aio_context
,
2451 .bdrv_attach_aio_context
= raw_attach_aio_context
,
2453 /* removable device support */
2454 .bdrv_is_inserted
= cdrom_is_inserted
,
2455 .bdrv_eject
= cdrom_eject
,
2456 .bdrv_lock_medium
= cdrom_lock_medium
,
2458 /* generic scsi device */
2459 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2461 #endif /* __linux__ */
2463 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2464 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2467 BDRVRawState
*s
= bs
->opaque
;
2468 Error
*local_err
= NULL
;
2473 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2476 error_propagate(errp
, local_err
);
2481 /* make sure the door isn't locked at this time */
2482 ioctl(s
->fd
, CDIOCALLOW
);
2486 static int cdrom_probe_device(const char *filename
)
2488 if (strstart(filename
, "/dev/cd", NULL
) ||
2489 strstart(filename
, "/dev/acd", NULL
))
2494 static int cdrom_reopen(BlockDriverState
*bs
)
2496 BDRVRawState
*s
= bs
->opaque
;
2500 * Force reread of possibly changed/newly loaded disc,
2501 * FreeBSD seems to not notice sometimes...
2505 fd
= qemu_open(bs
->filename
, s
->open_flags
, 0644);
2512 /* make sure the door isn't locked at this time */
2513 ioctl(s
->fd
, CDIOCALLOW
);
2517 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2519 return raw_getlength(bs
) > 0;
2522 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2524 BDRVRawState
*s
= bs
->opaque
;
2529 (void) ioctl(s
->fd
, CDIOCALLOW
);
2532 if (ioctl(s
->fd
, CDIOCEJECT
) < 0)
2533 perror("CDIOCEJECT");
2535 if (ioctl(s
->fd
, CDIOCCLOSE
) < 0)
2536 perror("CDIOCCLOSE");
2542 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2544 BDRVRawState
*s
= bs
->opaque
;
2548 if (ioctl(s
->fd
, (locked
? CDIOCPREVENT
: CDIOCALLOW
)) < 0) {
2550 * Note: an error can happen if the distribution automatically
2553 /* perror("CDROM_LOCKDOOR"); */
2557 static BlockDriver bdrv_host_cdrom
= {
2558 .format_name
= "host_cdrom",
2559 .protocol_name
= "host_cdrom",
2560 .instance_size
= sizeof(BDRVRawState
),
2561 .bdrv_needs_filename
= true,
2562 .bdrv_probe_device
= cdrom_probe_device
,
2563 .bdrv_parse_filename
= cdrom_parse_filename
,
2564 .bdrv_file_open
= cdrom_open
,
2565 .bdrv_close
= raw_close
,
2566 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2567 .bdrv_reopen_commit
= raw_reopen_commit
,
2568 .bdrv_reopen_abort
= raw_reopen_abort
,
2569 .bdrv_create
= hdev_create
,
2570 .create_opts
= &raw_create_opts
,
2572 .bdrv_aio_readv
= raw_aio_readv
,
2573 .bdrv_aio_writev
= raw_aio_writev
,
2574 .bdrv_aio_flush
= raw_aio_flush
,
2575 .bdrv_refresh_limits
= raw_refresh_limits
,
2576 .bdrv_io_plug
= raw_aio_plug
,
2577 .bdrv_io_unplug
= raw_aio_unplug
,
2578 .bdrv_flush_io_queue
= raw_aio_flush_io_queue
,
2580 .bdrv_truncate
= raw_truncate
,
2581 .bdrv_getlength
= raw_getlength
,
2582 .has_variable_length
= true,
2583 .bdrv_get_allocated_file_size
2584 = raw_get_allocated_file_size
,
2586 .bdrv_detach_aio_context
= raw_detach_aio_context
,
2587 .bdrv_attach_aio_context
= raw_attach_aio_context
,
2589 /* removable device support */
2590 .bdrv_is_inserted
= cdrom_is_inserted
,
2591 .bdrv_eject
= cdrom_eject
,
2592 .bdrv_lock_medium
= cdrom_lock_medium
,
2594 #endif /* __FreeBSD__ */
2596 static void bdrv_file_init(void)
2599 * Register all the drivers. Note that order is important, the driver
2600 * registered last will get probed first.
2602 bdrv_register(&bdrv_file
);
2603 bdrv_register(&bdrv_host_device
);
2605 bdrv_register(&bdrv_host_cdrom
);
2607 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2608 bdrv_register(&bdrv_host_cdrom
);
2612 block_init(bdrv_file_init
);