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 "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"
31 #include "block/thread-pool.h"
33 #include "block/raw-aio.h"
34 #include "qapi/util.h"
35 #include "qapi/qmp/qstring.h"
37 #if defined(__APPLE__) && (__MACH__)
39 #include <sys/param.h>
40 #include <IOKit/IOKitLib.h>
41 #include <IOKit/IOBSD.h>
42 #include <IOKit/storage/IOMediaBSDClient.h>
43 #include <IOKit/storage/IOMedia.h>
44 #include <IOKit/storage/IOCDMedia.h>
45 //#include <IOKit/storage/IOCDTypes.h>
46 #include <IOKit/storage/IODVDMedia.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 /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes,
133 * leaving a few more bytes for its future use. */
134 #define RAW_LOCK_PERM_BASE 100
135 #define RAW_LOCK_SHARED_BASE 200
137 typedef struct BDRVRawState
{
145 /* The current permissions. */
147 uint64_t shared_perm
;
153 bool has_write_zeroes
:1;
154 bool discard_zeroes
:1;
155 bool use_linux_aio
:1;
156 bool page_cache_inconsistent
:1;
158 bool needs_alignment
;
161 typedef struct BDRVRawReopenState
{
164 } BDRVRawReopenState
;
166 static int fd_open(BlockDriverState
*bs
);
167 static int64_t raw_getlength(BlockDriverState
*bs
);
169 typedef struct RawPosixAIOData
{
170 BlockDriverState
*bs
;
173 struct iovec
*aio_iov
;
178 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
183 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
184 static int cdrom_reopen(BlockDriverState
*bs
);
187 #if defined(__NetBSD__)
188 static int raw_normalize_devicepath(const char **filename
)
190 static char namebuf
[PATH_MAX
];
191 const char *dp
, *fname
;
195 dp
= strrchr(fname
, '/');
196 if (lstat(fname
, &sb
) < 0) {
197 fprintf(stderr
, "%s: stat failed: %s\n",
198 fname
, strerror(errno
));
202 if (!S_ISBLK(sb
.st_mode
)) {
207 snprintf(namebuf
, PATH_MAX
, "r%s", fname
);
209 snprintf(namebuf
, PATH_MAX
, "%.*s/r%s",
210 (int)(dp
- fname
), fname
, dp
+ 1);
212 fprintf(stderr
, "%s is a block device", fname
);
214 fprintf(stderr
, ", using %s\n", *filename
);
219 static int raw_normalize_devicepath(const char **filename
)
226 * Get logical block size via ioctl. On success store it in @sector_size_p.
228 static int probe_logical_blocksize(int fd
, unsigned int *sector_size_p
)
230 unsigned int sector_size
;
231 bool success
= false;
235 static const unsigned long ioctl_list
[] = {
239 #ifdef DKIOCGETBLOCKSIZE
242 #ifdef DIOCGSECTORSIZE
247 /* Try a few ioctls to get the right size */
248 for (i
= 0; i
< (int)ARRAY_SIZE(ioctl_list
); i
++) {
249 if (ioctl(fd
, ioctl_list
[i
], §or_size
) >= 0) {
250 *sector_size_p
= sector_size
;
255 return success
? 0 : -errno
;
259 * Get physical block size of @fd.
260 * On success, store it in @blk_size and return 0.
261 * On failure, return -errno.
263 static int probe_physical_blocksize(int fd
, unsigned int *blk_size
)
266 if (ioctl(fd
, BLKPBSZGET
, blk_size
) < 0) {
275 /* Check if read is allowed with given memory buffer and length.
277 * This function is used to check O_DIRECT memory buffer and request alignment.
279 static bool raw_is_io_aligned(int fd
, void *buf
, size_t len
)
281 ssize_t ret
= pread(fd
, buf
, len
, 0);
288 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
289 * other errors (e.g. real I/O error), which could happen on a failed
290 * drive, since we only care about probing alignment.
292 if (errno
!= EINVAL
) {
300 static void raw_probe_alignment(BlockDriverState
*bs
, int fd
, Error
**errp
)
302 BDRVRawState
*s
= bs
->opaque
;
304 size_t max_align
= MAX(MAX_BLOCKSIZE
, getpagesize());
306 /* For SCSI generic devices the alignment is not really used.
307 With buffered I/O, we don't have any restrictions. */
308 if (bdrv_is_sg(bs
) || !s
->needs_alignment
) {
309 bs
->bl
.request_alignment
= 1;
314 bs
->bl
.request_alignment
= 0;
316 /* Let's try to use the logical blocksize for the alignment. */
317 if (probe_logical_blocksize(fd
, &bs
->bl
.request_alignment
) < 0) {
318 bs
->bl
.request_alignment
= 0;
323 if (xfsctl(NULL
, fd
, XFS_IOC_DIOINFO
, &da
) >= 0) {
324 bs
->bl
.request_alignment
= da
.d_miniosz
;
325 /* The kernel returns wrong information for d_mem */
326 /* s->buf_align = da.d_mem; */
331 /* If we could not get the sizes so far, we can only guess them */
334 buf
= qemu_memalign(max_align
, 2 * max_align
);
335 for (align
= 512; align
<= max_align
; align
<<= 1) {
336 if (raw_is_io_aligned(fd
, buf
+ align
, max_align
)) {
337 s
->buf_align
= align
;
344 if (!bs
->bl
.request_alignment
) {
346 buf
= qemu_memalign(s
->buf_align
, max_align
);
347 for (align
= 512; align
<= max_align
; align
<<= 1) {
348 if (raw_is_io_aligned(fd
, buf
, align
)) {
349 bs
->bl
.request_alignment
= align
;
356 if (!s
->buf_align
|| !bs
->bl
.request_alignment
) {
357 error_setg(errp
, "Could not find working O_DIRECT alignment");
358 error_append_hint(errp
, "Try cache.direct=off\n");
362 static void raw_parse_flags(int bdrv_flags
, int *open_flags
)
364 assert(open_flags
!= NULL
);
366 *open_flags
|= O_BINARY
;
367 *open_flags
&= ~O_ACCMODE
;
368 if (bdrv_flags
& BDRV_O_RDWR
) {
369 *open_flags
|= O_RDWR
;
371 *open_flags
|= O_RDONLY
;
374 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
375 * and O_DIRECT for no caching. */
376 if ((bdrv_flags
& BDRV_O_NOCACHE
)) {
377 *open_flags
|= O_DIRECT
;
381 static void raw_parse_filename(const char *filename
, QDict
*options
,
384 bdrv_parse_filename_strip_prefix(filename
, "file:", options
);
387 static QemuOptsList raw_runtime_opts
= {
389 .head
= QTAILQ_HEAD_INITIALIZER(raw_runtime_opts
.head
),
393 .type
= QEMU_OPT_STRING
,
394 .help
= "File name of the image",
398 .type
= QEMU_OPT_STRING
,
399 .help
= "host AIO implementation (threads, native)",
403 .type
= QEMU_OPT_STRING
,
404 .help
= "file locking mode (on/off/auto, default: auto)",
406 { /* end of list */ }
410 static int raw_open_common(BlockDriverState
*bs
, QDict
*options
,
411 int bdrv_flags
, int open_flags
, Error
**errp
)
413 BDRVRawState
*s
= bs
->opaque
;
415 Error
*local_err
= NULL
;
416 const char *filename
= NULL
;
417 BlockdevAioOptions aio
, aio_default
;
422 opts
= qemu_opts_create(&raw_runtime_opts
, NULL
, 0, &error_abort
);
423 qemu_opts_absorb_qdict(opts
, options
, &local_err
);
425 error_propagate(errp
, local_err
);
430 filename
= qemu_opt_get(opts
, "filename");
432 ret
= raw_normalize_devicepath(&filename
);
434 error_setg_errno(errp
, -ret
, "Could not normalize device path");
438 aio_default
= (bdrv_flags
& BDRV_O_NATIVE_AIO
)
439 ? BLOCKDEV_AIO_OPTIONS_NATIVE
440 : BLOCKDEV_AIO_OPTIONS_THREADS
;
441 aio
= qapi_enum_parse(BlockdevAioOptions_lookup
, qemu_opt_get(opts
, "aio"),
442 BLOCKDEV_AIO_OPTIONS__MAX
, aio_default
, &local_err
);
444 error_propagate(errp
, local_err
);
448 s
->use_linux_aio
= (aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
);
450 locking
= qapi_enum_parse(OnOffAuto_lookup
, qemu_opt_get(opts
, "locking"),
451 ON_OFF_AUTO__MAX
, ON_OFF_AUTO_AUTO
, &local_err
);
453 error_propagate(errp
, local_err
);
462 "File lock requested but OFD locking syscall is unavailable, "
463 "falling back to POSIX file locks.\n"
464 "Due to the implementation, locks can be lost unexpectedly.\n");
467 case ON_OFF_AUTO_OFF
:
470 case ON_OFF_AUTO_AUTO
:
481 s
->open_flags
= open_flags
;
482 raw_parse_flags(bdrv_flags
, &s
->open_flags
);
485 fd
= qemu_open(filename
, s
->open_flags
, 0644);
488 error_setg_errno(errp
, errno
, "Could not open '%s'", filename
);
498 fd
= qemu_open(filename
, s
->open_flags
);
501 error_setg_errno(errp
, errno
, "Could not open '%s' for locking",
509 s
->shared_perm
= BLK_PERM_ALL
;
511 #ifdef CONFIG_LINUX_AIO
512 /* Currently Linux does AIO only for files opened with O_DIRECT */
513 if (s
->use_linux_aio
&& !(s
->open_flags
& O_DIRECT
)) {
514 error_setg(errp
, "aio=native was specified, but it requires "
515 "cache.direct=on, which was not specified.");
520 if (s
->use_linux_aio
) {
521 error_setg(errp
, "aio=native was specified, but is not supported "
526 #endif /* !defined(CONFIG_LINUX_AIO) */
528 s
->has_discard
= true;
529 s
->has_write_zeroes
= true;
530 bs
->supported_zero_flags
= BDRV_REQ_MAY_UNMAP
;
531 if ((bs
->open_flags
& BDRV_O_NOCACHE
) != 0) {
532 s
->needs_alignment
= true;
535 if (fstat(s
->fd
, &st
) < 0) {
537 error_setg_errno(errp
, errno
, "Could not stat file");
540 if (S_ISREG(st
.st_mode
)) {
541 s
->discard_zeroes
= true;
542 s
->has_fallocate
= true;
544 if (S_ISBLK(st
.st_mode
)) {
545 #ifdef BLKDISCARDZEROES
547 if (ioctl(s
->fd
, BLKDISCARDZEROES
, &arg
) == 0 && arg
) {
548 s
->discard_zeroes
= true;
552 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
553 * not rely on the contents of discarded blocks unless using O_DIRECT.
554 * Same for BLKZEROOUT.
556 if (!(bs
->open_flags
& BDRV_O_NOCACHE
)) {
557 s
->discard_zeroes
= false;
558 s
->has_write_zeroes
= false;
563 if (S_ISCHR(st
.st_mode
)) {
565 * The file is a char device (disk), which on FreeBSD isn't behind
566 * a pager, so force all requests to be aligned. This is needed
567 * so QEMU makes sure all IO operations on the device are aligned
568 * to sector size, or else FreeBSD will reject them with EINVAL.
570 s
->needs_alignment
= true;
575 if (platform_test_xfs_fd(s
->fd
)) {
582 if (filename
&& (bdrv_flags
& BDRV_O_TEMPORARY
)) {
589 static int raw_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
592 BDRVRawState
*s
= bs
->opaque
;
594 s
->type
= FTYPE_FILE
;
595 return raw_open_common(bs
, options
, flags
, 0, errp
);
604 #define PERM_FOREACH(i) \
605 for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++)
607 /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the
608 * file; if @unlock == true, also unlock the unneeded bytes.
609 * @shared_perm_lock_bits is the mask of all permissions that are NOT shared.
611 static int raw_apply_lock_bytes(BDRVRawState
*s
,
612 uint64_t perm_lock_bits
,
613 uint64_t shared_perm_lock_bits
,
614 bool unlock
, Error
**errp
)
620 int off
= RAW_LOCK_PERM_BASE
+ i
;
621 if (perm_lock_bits
& (1ULL << i
)) {
622 ret
= qemu_lock_fd(s
->lock_fd
, off
, 1, false);
624 error_setg(errp
, "Failed to lock byte %d", off
);
628 ret
= qemu_unlock_fd(s
->lock_fd
, off
, 1);
630 error_setg(errp
, "Failed to unlock byte %d", off
);
636 int off
= RAW_LOCK_SHARED_BASE
+ i
;
637 if (shared_perm_lock_bits
& (1ULL << i
)) {
638 ret
= qemu_lock_fd(s
->lock_fd
, off
, 1, false);
640 error_setg(errp
, "Failed to lock byte %d", off
);
644 ret
= qemu_unlock_fd(s
->lock_fd
, off
, 1);
646 error_setg(errp
, "Failed to unlock byte %d", off
);
654 /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */
655 static int raw_check_lock_bytes(BDRVRawState
*s
,
656 uint64_t perm
, uint64_t shared_perm
,
663 int off
= RAW_LOCK_SHARED_BASE
+ i
;
664 uint64_t p
= 1ULL << i
;
666 ret
= qemu_lock_fd_test(s
->lock_fd
, off
, 1, true);
668 char *perm_name
= bdrv_perm_names(p
);
670 "Failed to get \"%s\" lock",
673 error_append_hint(errp
,
674 "Is another process using the image?\n");
680 int off
= RAW_LOCK_PERM_BASE
+ i
;
681 uint64_t p
= 1ULL << i
;
682 if (!(shared_perm
& p
)) {
683 ret
= qemu_lock_fd_test(s
->lock_fd
, off
, 1, true);
685 char *perm_name
= bdrv_perm_names(p
);
687 "Failed to get shared \"%s\" lock",
690 error_append_hint(errp
,
691 "Is another process using the image?\n");
699 static int raw_handle_perm_lock(BlockDriverState
*bs
,
701 uint64_t new_perm
, uint64_t new_shared
,
704 BDRVRawState
*s
= bs
->opaque
;
706 Error
*local_err
= NULL
;
712 if (bdrv_get_flags(bs
) & BDRV_O_INACTIVE
) {
716 assert(s
->lock_fd
> 0);
720 ret
= raw_apply_lock_bytes(s
, s
->perm
| new_perm
,
721 ~s
->shared_perm
| ~new_shared
,
724 ret
= raw_check_lock_bytes(s
, new_perm
, new_shared
, errp
);
730 /* fall through to unlock bytes. */
732 raw_apply_lock_bytes(s
, s
->perm
, ~s
->shared_perm
, true, &local_err
);
734 /* Theoretically the above call only unlocks bytes and it cannot
735 * fail. Something weird happened, report it.
737 error_report_err(local_err
);
741 raw_apply_lock_bytes(s
, new_perm
, ~new_shared
, true, &local_err
);
743 /* Theoretically the above call only unlocks bytes and it cannot
744 * fail. Something weird happened, report it.
746 error_report_err(local_err
);
753 static int raw_reopen_prepare(BDRVReopenState
*state
,
754 BlockReopenQueue
*queue
, Error
**errp
)
757 BDRVRawReopenState
*rs
;
759 Error
*local_err
= NULL
;
761 assert(state
!= NULL
);
762 assert(state
->bs
!= NULL
);
764 s
= state
->bs
->opaque
;
766 state
->opaque
= g_new0(BDRVRawReopenState
, 1);
769 if (s
->type
== FTYPE_CD
) {
770 rs
->open_flags
|= O_NONBLOCK
;
773 raw_parse_flags(state
->flags
, &rs
->open_flags
);
777 int fcntl_flags
= O_APPEND
| O_NONBLOCK
;
779 fcntl_flags
|= O_NOATIME
;
783 /* Not all operating systems have O_ASYNC, and those that don't
784 * will not let us track the state into rs->open_flags (typically
785 * you achieve the same effect with an ioctl, for example I_SETSIG
786 * on Solaris). But we do not use O_ASYNC, so that's fine.
788 assert((s
->open_flags
& O_ASYNC
) == 0);
791 if ((rs
->open_flags
& ~fcntl_flags
) == (s
->open_flags
& ~fcntl_flags
)) {
792 /* dup the original fd */
793 rs
->fd
= qemu_dup(s
->fd
);
795 ret
= fcntl_setfl(rs
->fd
, rs
->open_flags
);
803 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
805 const char *normalized_filename
= state
->bs
->filename
;
806 ret
= raw_normalize_devicepath(&normalized_filename
);
808 error_setg_errno(errp
, -ret
, "Could not normalize device path");
810 assert(!(rs
->open_flags
& O_CREAT
));
811 rs
->fd
= qemu_open(normalized_filename
, rs
->open_flags
);
813 error_setg_errno(errp
, errno
, "Could not reopen file");
819 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
820 * alignment with the new fd. */
822 raw_probe_alignment(state
->bs
, rs
->fd
, &local_err
);
826 error_propagate(errp
, local_err
);
834 static void raw_reopen_commit(BDRVReopenState
*state
)
836 BDRVRawReopenState
*rs
= state
->opaque
;
837 BDRVRawState
*s
= state
->bs
->opaque
;
839 s
->open_flags
= rs
->open_flags
;
844 g_free(state
->opaque
);
845 state
->opaque
= NULL
;
849 static void raw_reopen_abort(BDRVReopenState
*state
)
851 BDRVRawReopenState
*rs
= state
->opaque
;
853 /* nothing to do if NULL, we didn't get far enough */
862 g_free(state
->opaque
);
863 state
->opaque
= NULL
;
866 static int hdev_get_max_transfer_length(BlockDriverState
*bs
, int fd
)
870 short max_sectors
= 0;
871 if (bs
->sg
&& ioctl(fd
, BLKSECTGET
, &max_bytes
) == 0) {
873 } else if (!bs
->sg
&& ioctl(fd
, BLKSECTGET
, &max_sectors
) == 0) {
874 return max_sectors
<< BDRV_SECTOR_BITS
;
883 static int hdev_get_max_segments(const struct stat
*st
)
893 sysfspath
= g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
894 major(st
->st_rdev
), minor(st
->st_rdev
));
895 fd
= open(sysfspath
, O_RDONLY
);
901 ret
= read(fd
, buf
, sizeof(buf
) - 1);
902 } while (ret
== -1 && errno
== EINTR
);
906 } else if (ret
== 0) {
911 /* The file is ended with '\n', pass 'end' to accept that. */
912 ret
= qemu_strtol(buf
, &end
, 10, &max_segments
);
913 if (ret
== 0 && end
&& *end
== '\n') {
928 static void raw_refresh_limits(BlockDriverState
*bs
, Error
**errp
)
930 BDRVRawState
*s
= bs
->opaque
;
933 if (!fstat(s
->fd
, &st
)) {
934 if (S_ISBLK(st
.st_mode
) || S_ISCHR(st
.st_mode
)) {
935 int ret
= hdev_get_max_transfer_length(bs
, s
->fd
);
936 if (ret
> 0 && ret
<= BDRV_REQUEST_MAX_BYTES
) {
937 bs
->bl
.max_transfer
= pow2floor(ret
);
939 ret
= hdev_get_max_segments(&st
);
941 bs
->bl
.max_transfer
= MIN(bs
->bl
.max_transfer
,
942 ret
* getpagesize());
947 raw_probe_alignment(bs
, s
->fd
, errp
);
948 bs
->bl
.min_mem_alignment
= s
->buf_align
;
949 bs
->bl
.opt_mem_alignment
= MAX(s
->buf_align
, getpagesize());
952 static int check_for_dasd(int fd
)
955 struct dasd_information2_t info
= {0};
957 return ioctl(fd
, BIODASDINFO2
, &info
);
964 * Try to get @bs's logical and physical block size.
965 * On success, store them in @bsz and return zero.
966 * On failure, return negative errno.
968 static int hdev_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
)
970 BDRVRawState
*s
= bs
->opaque
;
973 /* If DASD, get blocksizes */
974 if (check_for_dasd(s
->fd
) < 0) {
977 ret
= probe_logical_blocksize(s
->fd
, &bsz
->log
);
981 return probe_physical_blocksize(s
->fd
, &bsz
->phys
);
985 * Try to get @bs's geometry: cyls, heads, sectors.
986 * On success, store them in @geo and return 0.
987 * On failure return -errno.
988 * (Allows block driver to assign default geometry values that guest sees)
991 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
993 BDRVRawState
*s
= bs
->opaque
;
994 struct hd_geometry ioctl_geo
= {0};
996 /* If DASD, get its geometry */
997 if (check_for_dasd(s
->fd
) < 0) {
1000 if (ioctl(s
->fd
, HDIO_GETGEO
, &ioctl_geo
) < 0) {
1003 /* HDIO_GETGEO may return success even though geo contains zeros
1004 (e.g. certain multipath setups) */
1005 if (!ioctl_geo
.heads
|| !ioctl_geo
.sectors
|| !ioctl_geo
.cylinders
) {
1008 /* Do not return a geometry for partition */
1009 if (ioctl_geo
.start
!= 0) {
1012 geo
->heads
= ioctl_geo
.heads
;
1013 geo
->sectors
= ioctl_geo
.sectors
;
1014 geo
->cylinders
= ioctl_geo
.cylinders
;
1018 #else /* __linux__ */
1019 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
1025 static ssize_t
handle_aiocb_ioctl(RawPosixAIOData
*aiocb
)
1029 ret
= ioctl(aiocb
->aio_fildes
, aiocb
->aio_ioctl_cmd
, aiocb
->aio_ioctl_buf
);
1037 static ssize_t
handle_aiocb_flush(RawPosixAIOData
*aiocb
)
1039 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1042 if (s
->page_cache_inconsistent
) {
1046 ret
= qemu_fdatasync(aiocb
->aio_fildes
);
1048 /* There is no clear definition of the semantics of a failing fsync(),
1049 * so we may have to assume the worst. The sad truth is that this
1050 * assumption is correct for Linux. Some pages are now probably marked
1051 * clean in the page cache even though they are inconsistent with the
1052 * on-disk contents. The next fdatasync() call would succeed, but no
1053 * further writeback attempt will be made. We can't get back to a state
1054 * in which we know what is on disk (we would have to rewrite
1055 * everything that was touched since the last fdatasync() at least), so
1056 * make bdrv_flush() fail permanently. Given that the behaviour isn't
1057 * really defined, I have little hope that other OSes are doing better.
1059 * Obviously, this doesn't affect O_DIRECT, which bypasses the page
1061 if ((s
->open_flags
& O_DIRECT
) == 0) {
1062 s
->page_cache_inconsistent
= true;
1069 #ifdef CONFIG_PREADV
1071 static bool preadv_present
= true;
1074 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1076 return preadv(fd
, iov
, nr_iov
, offset
);
1080 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1082 return pwritev(fd
, iov
, nr_iov
, offset
);
1087 static bool preadv_present
= false;
1090 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1096 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1103 static ssize_t
handle_aiocb_rw_vector(RawPosixAIOData
*aiocb
)
1108 if (aiocb
->aio_type
& QEMU_AIO_WRITE
)
1109 len
= qemu_pwritev(aiocb
->aio_fildes
,
1114 len
= qemu_preadv(aiocb
->aio_fildes
,
1118 } while (len
== -1 && errno
== EINTR
);
1127 * Read/writes the data to/from a given linear buffer.
1129 * Returns the number of bytes handles or -errno in case of an error. Short
1130 * reads are only returned if the end of the file is reached.
1132 static ssize_t
handle_aiocb_rw_linear(RawPosixAIOData
*aiocb
, char *buf
)
1137 while (offset
< aiocb
->aio_nbytes
) {
1138 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
1139 len
= pwrite(aiocb
->aio_fildes
,
1140 (const char *)buf
+ offset
,
1141 aiocb
->aio_nbytes
- offset
,
1142 aiocb
->aio_offset
+ offset
);
1144 len
= pread(aiocb
->aio_fildes
,
1146 aiocb
->aio_nbytes
- offset
,
1147 aiocb
->aio_offset
+ offset
);
1149 if (len
== -1 && errno
== EINTR
) {
1151 } else if (len
== -1 && errno
== EINVAL
&&
1152 (aiocb
->bs
->open_flags
& BDRV_O_NOCACHE
) &&
1153 !(aiocb
->aio_type
& QEMU_AIO_WRITE
) &&
1155 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
1156 * after a short read. Assume that O_DIRECT short reads only occur
1157 * at EOF. Therefore this is a short read, not an I/O error.
1160 } else if (len
== -1) {
1163 } else if (len
== 0) {
1172 static ssize_t
handle_aiocb_rw(RawPosixAIOData
*aiocb
)
1177 if (!(aiocb
->aio_type
& QEMU_AIO_MISALIGNED
)) {
1179 * If there is just a single buffer, and it is properly aligned
1180 * we can just use plain pread/pwrite without any problems.
1182 if (aiocb
->aio_niov
== 1) {
1183 return handle_aiocb_rw_linear(aiocb
, aiocb
->aio_iov
->iov_base
);
1186 * We have more than one iovec, and all are properly aligned.
1188 * Try preadv/pwritev first and fall back to linearizing the
1189 * buffer if it's not supported.
1191 if (preadv_present
) {
1192 nbytes
= handle_aiocb_rw_vector(aiocb
);
1193 if (nbytes
== aiocb
->aio_nbytes
||
1194 (nbytes
< 0 && nbytes
!= -ENOSYS
)) {
1197 preadv_present
= false;
1201 * XXX(hch): short read/write. no easy way to handle the reminder
1202 * using these interfaces. For now retry using plain
1208 * Ok, we have to do it the hard way, copy all segments into
1209 * a single aligned buffer.
1211 buf
= qemu_try_blockalign(aiocb
->bs
, aiocb
->aio_nbytes
);
1216 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
1220 for (i
= 0; i
< aiocb
->aio_niov
; ++i
) {
1221 memcpy(p
, aiocb
->aio_iov
[i
].iov_base
, aiocb
->aio_iov
[i
].iov_len
);
1222 p
+= aiocb
->aio_iov
[i
].iov_len
;
1224 assert(p
- buf
== aiocb
->aio_nbytes
);
1227 nbytes
= handle_aiocb_rw_linear(aiocb
, buf
);
1228 if (!(aiocb
->aio_type
& QEMU_AIO_WRITE
)) {
1230 size_t count
= aiocb
->aio_nbytes
, copy
;
1233 for (i
= 0; i
< aiocb
->aio_niov
&& count
; ++i
) {
1235 if (copy
> aiocb
->aio_iov
[i
].iov_len
) {
1236 copy
= aiocb
->aio_iov
[i
].iov_len
;
1238 memcpy(aiocb
->aio_iov
[i
].iov_base
, p
, copy
);
1239 assert(count
>= copy
);
1251 static int xfs_write_zeroes(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1253 struct xfs_flock64 fl
;
1256 memset(&fl
, 0, sizeof(fl
));
1257 fl
.l_whence
= SEEK_SET
;
1258 fl
.l_start
= offset
;
1261 if (xfsctl(NULL
, s
->fd
, XFS_IOC_ZERO_RANGE
, &fl
) < 0) {
1263 DPRINTF("cannot write zero range (%s)\n", strerror(errno
));
1270 static int xfs_discard(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1272 struct xfs_flock64 fl
;
1275 memset(&fl
, 0, sizeof(fl
));
1276 fl
.l_whence
= SEEK_SET
;
1277 fl
.l_start
= offset
;
1280 if (xfsctl(NULL
, s
->fd
, XFS_IOC_UNRESVSP64
, &fl
) < 0) {
1282 DPRINTF("cannot punch hole (%s)\n", strerror(errno
));
1290 static int translate_err(int err
)
1292 if (err
== -ENODEV
|| err
== -ENOSYS
|| err
== -EOPNOTSUPP
||
1299 #ifdef CONFIG_FALLOCATE
1300 static int do_fallocate(int fd
, int mode
, off_t offset
, off_t len
)
1303 if (fallocate(fd
, mode
, offset
, len
) == 0) {
1306 } while (errno
== EINTR
);
1307 return translate_err(-errno
);
1311 static ssize_t
handle_aiocb_write_zeroes_block(RawPosixAIOData
*aiocb
)
1314 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1316 if (!s
->has_write_zeroes
) {
1322 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1323 if (ioctl(aiocb
->aio_fildes
, BLKZEROOUT
, range
) == 0) {
1326 } while (errno
== EINTR
);
1328 ret
= translate_err(-errno
);
1331 if (ret
== -ENOTSUP
) {
1332 s
->has_write_zeroes
= false;
1337 static ssize_t
handle_aiocb_write_zeroes(RawPosixAIOData
*aiocb
)
1339 #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
1340 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1343 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1344 return handle_aiocb_write_zeroes_block(aiocb
);
1349 return xfs_write_zeroes(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1353 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1354 if (s
->has_write_zeroes
) {
1355 int ret
= do_fallocate(s
->fd
, FALLOC_FL_ZERO_RANGE
,
1356 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1357 if (ret
== 0 || ret
!= -ENOTSUP
) {
1360 s
->has_write_zeroes
= false;
1364 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1365 if (s
->has_discard
&& s
->has_fallocate
) {
1366 int ret
= do_fallocate(s
->fd
,
1367 FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1368 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1370 ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1371 if (ret
== 0 || ret
!= -ENOTSUP
) {
1374 s
->has_fallocate
= false;
1375 } else if (ret
!= -ENOTSUP
) {
1378 s
->has_discard
= false;
1383 #ifdef CONFIG_FALLOCATE
1384 if (s
->has_fallocate
&& aiocb
->aio_offset
>= bdrv_getlength(aiocb
->bs
)) {
1385 int ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1386 if (ret
== 0 || ret
!= -ENOTSUP
) {
1389 s
->has_fallocate
= false;
1396 static ssize_t
handle_aiocb_discard(RawPosixAIOData
*aiocb
)
1398 int ret
= -EOPNOTSUPP
;
1399 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1401 if (!s
->has_discard
) {
1405 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1408 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1409 if (ioctl(aiocb
->aio_fildes
, BLKDISCARD
, range
) == 0) {
1412 } while (errno
== EINTR
);
1419 return xfs_discard(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1423 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1424 ret
= do_fallocate(s
->fd
, FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1425 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1429 ret
= translate_err(ret
);
1430 if (ret
== -ENOTSUP
) {
1431 s
->has_discard
= false;
1436 static int aio_worker(void *arg
)
1438 RawPosixAIOData
*aiocb
= arg
;
1441 switch (aiocb
->aio_type
& QEMU_AIO_TYPE_MASK
) {
1443 ret
= handle_aiocb_rw(aiocb
);
1444 if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1445 iov_memset(aiocb
->aio_iov
, aiocb
->aio_niov
, ret
,
1446 0, aiocb
->aio_nbytes
- ret
);
1448 ret
= aiocb
->aio_nbytes
;
1450 if (ret
== aiocb
->aio_nbytes
) {
1452 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1456 case QEMU_AIO_WRITE
:
1457 ret
= handle_aiocb_rw(aiocb
);
1458 if (ret
== aiocb
->aio_nbytes
) {
1460 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1464 case QEMU_AIO_FLUSH
:
1465 ret
= handle_aiocb_flush(aiocb
);
1467 case QEMU_AIO_IOCTL
:
1468 ret
= handle_aiocb_ioctl(aiocb
);
1470 case QEMU_AIO_DISCARD
:
1471 ret
= handle_aiocb_discard(aiocb
);
1473 case QEMU_AIO_WRITE_ZEROES
:
1474 ret
= handle_aiocb_write_zeroes(aiocb
);
1477 fprintf(stderr
, "invalid aio request (0x%x)\n", aiocb
->aio_type
);
1486 static int paio_submit_co(BlockDriverState
*bs
, int fd
,
1487 int64_t offset
, QEMUIOVector
*qiov
,
1488 int count
, int type
)
1490 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1494 acb
->aio_type
= type
;
1495 acb
->aio_fildes
= fd
;
1497 acb
->aio_nbytes
= count
;
1498 acb
->aio_offset
= offset
;
1501 acb
->aio_iov
= qiov
->iov
;
1502 acb
->aio_niov
= qiov
->niov
;
1503 assert(qiov
->size
== count
);
1506 trace_paio_submit_co(offset
, count
, type
);
1507 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1508 return thread_pool_submit_co(pool
, aio_worker
, acb
);
1511 static BlockAIOCB
*paio_submit(BlockDriverState
*bs
, int fd
,
1512 int64_t offset
, QEMUIOVector
*qiov
, int count
,
1513 BlockCompletionFunc
*cb
, void *opaque
, int type
)
1515 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1519 acb
->aio_type
= type
;
1520 acb
->aio_fildes
= fd
;
1522 acb
->aio_nbytes
= count
;
1523 acb
->aio_offset
= offset
;
1526 acb
->aio_iov
= qiov
->iov
;
1527 acb
->aio_niov
= qiov
->niov
;
1528 assert(qiov
->size
== acb
->aio_nbytes
);
1531 trace_paio_submit(acb
, opaque
, offset
, count
, type
);
1532 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1533 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
1536 static int coroutine_fn
raw_co_prw(BlockDriverState
*bs
, uint64_t offset
,
1537 uint64_t bytes
, QEMUIOVector
*qiov
, int type
)
1539 BDRVRawState
*s
= bs
->opaque
;
1541 if (fd_open(bs
) < 0)
1545 * Check if the underlying device requires requests to be aligned,
1546 * and if the request we are trying to submit is aligned or not.
1547 * If this is the case tell the low-level driver that it needs
1548 * to copy the buffer.
1550 if (s
->needs_alignment
) {
1551 if (!bdrv_qiov_is_aligned(bs
, qiov
)) {
1552 type
|= QEMU_AIO_MISALIGNED
;
1553 #ifdef CONFIG_LINUX_AIO
1554 } else if (s
->use_linux_aio
) {
1555 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1556 assert(qiov
->size
== bytes
);
1557 return laio_co_submit(bs
, aio
, s
->fd
, offset
, qiov
, type
);
1562 return paio_submit_co(bs
, s
->fd
, offset
, qiov
, bytes
, type
);
1565 static int coroutine_fn
raw_co_preadv(BlockDriverState
*bs
, uint64_t offset
,
1566 uint64_t bytes
, QEMUIOVector
*qiov
,
1569 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_READ
);
1572 static int coroutine_fn
raw_co_pwritev(BlockDriverState
*bs
, uint64_t offset
,
1573 uint64_t bytes
, QEMUIOVector
*qiov
,
1577 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_WRITE
);
1580 static void raw_aio_plug(BlockDriverState
*bs
)
1582 #ifdef CONFIG_LINUX_AIO
1583 BDRVRawState
*s
= bs
->opaque
;
1584 if (s
->use_linux_aio
) {
1585 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1586 laio_io_plug(bs
, aio
);
1591 static void raw_aio_unplug(BlockDriverState
*bs
)
1593 #ifdef CONFIG_LINUX_AIO
1594 BDRVRawState
*s
= bs
->opaque
;
1595 if (s
->use_linux_aio
) {
1596 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1597 laio_io_unplug(bs
, aio
);
1602 static BlockAIOCB
*raw_aio_flush(BlockDriverState
*bs
,
1603 BlockCompletionFunc
*cb
, void *opaque
)
1605 BDRVRawState
*s
= bs
->opaque
;
1607 if (fd_open(bs
) < 0)
1610 return paio_submit(bs
, s
->fd
, 0, NULL
, 0, cb
, opaque
, QEMU_AIO_FLUSH
);
1613 static void raw_close(BlockDriverState
*bs
)
1615 BDRVRawState
*s
= bs
->opaque
;
1621 if (s
->lock_fd
>= 0) {
1622 qemu_close(s
->lock_fd
);
1627 static int raw_truncate(BlockDriverState
*bs
, int64_t offset
, Error
**errp
)
1629 BDRVRawState
*s
= bs
->opaque
;
1633 if (fstat(s
->fd
, &st
)) {
1635 error_setg_errno(errp
, -ret
, "Failed to fstat() the file");
1639 if (S_ISREG(st
.st_mode
)) {
1640 if (ftruncate(s
->fd
, offset
) < 0) {
1642 error_setg_errno(errp
, -ret
, "Failed to resize the file");
1645 } else if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1646 if (offset
> raw_getlength(bs
)) {
1647 error_setg(errp
, "Cannot grow device files");
1651 error_setg(errp
, "Resizing this file is not supported");
1659 static int64_t raw_getlength(BlockDriverState
*bs
)
1661 BDRVRawState
*s
= bs
->opaque
;
1667 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1668 struct disklabel dl
;
1670 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1672 return (uint64_t)dl
.d_secsize
*
1673 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1677 #elif defined(__NetBSD__)
1678 static int64_t raw_getlength(BlockDriverState
*bs
)
1680 BDRVRawState
*s
= bs
->opaque
;
1686 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1687 struct dkwedge_info dkw
;
1689 if (ioctl(fd
, DIOCGWEDGEINFO
, &dkw
) != -1) {
1690 return dkw
.dkw_size
* 512;
1692 struct disklabel dl
;
1694 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1696 return (uint64_t)dl
.d_secsize
*
1697 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1702 #elif defined(__sun__)
1703 static int64_t raw_getlength(BlockDriverState
*bs
)
1705 BDRVRawState
*s
= bs
->opaque
;
1706 struct dk_minfo minfo
;
1716 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1718 ret
= ioctl(s
->fd
, DKIOCGMEDIAINFO
, &minfo
);
1720 return minfo
.dki_lbsize
* minfo
.dki_capacity
;
1724 * There are reports that lseek on some devices fails, but
1725 * irc discussion said that contingency on contingency was overkill.
1727 size
= lseek(s
->fd
, 0, SEEK_END
);
1733 #elif defined(CONFIG_BSD)
1734 static int64_t raw_getlength(BlockDriverState
*bs
)
1736 BDRVRawState
*s
= bs
->opaque
;
1740 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1749 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1752 if (!fstat(fd
, &sb
) && (S_IFCHR
& sb
.st_mode
)) {
1753 #ifdef DIOCGMEDIASIZE
1754 if (ioctl(fd
, DIOCGMEDIASIZE
, (off_t
*)&size
))
1755 #elif defined(DIOCGPART)
1758 if (ioctl(fd
, DIOCGPART
, &pi
) == 0)
1759 size
= pi
.media_size
;
1765 #if defined(__APPLE__) && defined(__MACH__)
1767 uint64_t sectors
= 0;
1768 uint32_t sector_size
= 0;
1770 if (ioctl(fd
, DKIOCGETBLOCKCOUNT
, §ors
) == 0
1771 && ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) == 0) {
1772 size
= sectors
* sector_size
;
1774 size
= lseek(fd
, 0LL, SEEK_END
);
1781 size
= lseek(fd
, 0LL, SEEK_END
);
1786 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1789 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1790 if (size
== 2048LL * (unsigned)-1)
1792 /* XXX no disc? maybe we need to reopen... */
1793 if (size
<= 0 && !reopened
&& cdrom_reopen(bs
) >= 0) {
1800 size
= lseek(fd
, 0, SEEK_END
);
1808 static int64_t raw_getlength(BlockDriverState
*bs
)
1810 BDRVRawState
*s
= bs
->opaque
;
1819 size
= lseek(s
->fd
, 0, SEEK_END
);
1827 static int64_t raw_get_allocated_file_size(BlockDriverState
*bs
)
1830 BDRVRawState
*s
= bs
->opaque
;
1832 if (fstat(s
->fd
, &st
) < 0) {
1835 return (int64_t)st
.st_blocks
* 512;
1838 static int raw_create(const char *filename
, QemuOpts
*opts
, Error
**errp
)
1842 int64_t total_size
= 0;
1844 PreallocMode prealloc
;
1846 Error
*local_err
= NULL
;
1848 strstart(filename
, "file:", &filename
);
1850 /* Read out options */
1851 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
1853 nocow
= qemu_opt_get_bool(opts
, BLOCK_OPT_NOCOW
, false);
1854 buf
= qemu_opt_get_del(opts
, BLOCK_OPT_PREALLOC
);
1855 prealloc
= qapi_enum_parse(PreallocMode_lookup
, buf
,
1856 PREALLOC_MODE__MAX
, PREALLOC_MODE_OFF
,
1860 error_propagate(errp
, local_err
);
1865 fd
= qemu_open(filename
, O_RDWR
| O_CREAT
| O_TRUNC
| O_BINARY
,
1869 error_setg_errno(errp
, -result
, "Could not create file");
1875 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1876 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1877 * will be ignored since any failure of this operation should not
1878 * block the left work.
1881 if (ioctl(fd
, FS_IOC_GETFLAGS
, &attr
) == 0) {
1882 attr
|= FS_NOCOW_FL
;
1883 ioctl(fd
, FS_IOC_SETFLAGS
, &attr
);
1889 #ifdef CONFIG_POSIX_FALLOCATE
1890 case PREALLOC_MODE_FALLOC
:
1892 * Truncating before posix_fallocate() makes it about twice slower on
1893 * file systems that do not support fallocate(), trying to check if a
1894 * block is allocated before allocating it, so don't do that here.
1896 result
= -posix_fallocate(fd
, 0, total_size
);
1898 /* posix_fallocate() doesn't set errno. */
1899 error_setg_errno(errp
, -result
,
1900 "Could not preallocate data for the new file");
1904 case PREALLOC_MODE_FULL
:
1907 * Knowing the final size from the beginning could allow the file
1908 * system driver to do less allocations and possibly avoid
1909 * fragmentation of the file.
1911 if (ftruncate(fd
, total_size
) != 0) {
1913 error_setg_errno(errp
, -result
, "Could not resize file");
1917 int64_t num
= 0, left
= total_size
;
1918 buf
= g_malloc0(65536);
1921 num
= MIN(left
, 65536);
1922 result
= write(fd
, buf
, num
);
1925 error_setg_errno(errp
, -result
,
1926 "Could not write to the new file");
1935 error_setg_errno(errp
, -result
,
1936 "Could not flush new file to disk");
1942 case PREALLOC_MODE_OFF
:
1943 if (ftruncate(fd
, total_size
) != 0) {
1945 error_setg_errno(errp
, -result
, "Could not resize file");
1950 error_setg(errp
, "Unsupported preallocation mode: %s",
1951 PreallocMode_lookup
[prealloc
]);
1956 if (qemu_close(fd
) != 0 && result
== 0) {
1958 error_setg_errno(errp
, -result
, "Could not close the new file");
1965 * Find allocation range in @bs around offset @start.
1966 * May change underlying file descriptor's file offset.
1967 * If @start is not in a hole, store @start in @data, and the
1968 * beginning of the next hole in @hole, and return 0.
1969 * If @start is in a non-trailing hole, store @start in @hole and the
1970 * beginning of the next non-hole in @data, and return 0.
1971 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1972 * If we can't find out, return a negative errno other than -ENXIO.
1974 static int find_allocation(BlockDriverState
*bs
, off_t start
,
1975 off_t
*data
, off_t
*hole
)
1977 #if defined SEEK_HOLE && defined SEEK_DATA
1978 BDRVRawState
*s
= bs
->opaque
;
1983 * D1. offs == start: start is in data
1984 * D2. offs > start: start is in a hole, next data at offs
1985 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1986 * or start is beyond EOF
1987 * If the latter happens, the file has been truncated behind
1988 * our back since we opened it. All bets are off then.
1989 * Treating like a trailing hole is simplest.
1990 * D4. offs < 0, errno != ENXIO: we learned nothing
1992 offs
= lseek(s
->fd
, start
, SEEK_DATA
);
1994 return -errno
; /* D3 or D4 */
1996 assert(offs
>= start
);
1999 /* D2: in hole, next data at offs */
2005 /* D1: in data, end not yet known */
2009 * H1. offs == start: start is in a hole
2010 * If this happens here, a hole has been dug behind our back
2011 * since the previous lseek().
2012 * H2. offs > start: either start is in data, next hole at offs,
2013 * or start is in trailing hole, EOF at offs
2014 * Linux treats trailing holes like any other hole: offs ==
2015 * start. Solaris seeks to EOF instead: offs > start (blech).
2016 * If that happens here, a hole has been dug behind our back
2017 * since the previous lseek().
2018 * H3. offs < 0, errno = ENXIO: start is beyond EOF
2019 * If this happens, the file has been truncated behind our
2020 * back since we opened it. Treat it like a trailing hole.
2021 * H4. offs < 0, errno != ENXIO: we learned nothing
2022 * Pretend we know nothing at all, i.e. "forget" about D1.
2024 offs
= lseek(s
->fd
, start
, SEEK_HOLE
);
2026 return -errno
; /* D1 and (H3 or H4) */
2028 assert(offs
>= start
);
2032 * D1 and H2: either in data, next hole at offs, or it was in
2033 * data but is now in a trailing hole. In the latter case,
2034 * all bets are off. Treating it as if it there was data all
2035 * the way to EOF is safe, so simply do that.
2050 * Returns the allocation status of the specified sectors.
2052 * If 'sector_num' is beyond the end of the disk image the return value is 0
2053 * and 'pnum' is set to 0.
2055 * 'pnum' is set to the number of sectors (including and immediately following
2056 * the specified sector) that are known to be in the same
2057 * allocated/unallocated state.
2059 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
2060 * beyond the end of the disk image it will be clamped.
2062 static int64_t coroutine_fn
raw_co_get_block_status(BlockDriverState
*bs
,
2064 int nb_sectors
, int *pnum
,
2065 BlockDriverState
**file
)
2067 off_t start
, data
= 0, hole
= 0;
2076 start
= sector_num
* BDRV_SECTOR_SIZE
;
2077 total_size
= bdrv_getlength(bs
);
2078 if (total_size
< 0) {
2080 } else if (start
>= total_size
) {
2083 } else if (start
+ nb_sectors
* BDRV_SECTOR_SIZE
> total_size
) {
2084 nb_sectors
= DIV_ROUND_UP(total_size
- start
, BDRV_SECTOR_SIZE
);
2087 ret
= find_allocation(bs
, start
, &data
, &hole
);
2088 if (ret
== -ENXIO
) {
2091 ret
= BDRV_BLOCK_ZERO
;
2092 } else if (ret
< 0) {
2093 /* No info available, so pretend there are no holes */
2095 ret
= BDRV_BLOCK_DATA
;
2096 } else if (data
== start
) {
2097 /* On a data extent, compute sectors to the end of the extent,
2098 * possibly including a partial sector at EOF. */
2099 *pnum
= MIN(nb_sectors
, DIV_ROUND_UP(hole
- start
, BDRV_SECTOR_SIZE
));
2100 ret
= BDRV_BLOCK_DATA
;
2102 /* On a hole, compute sectors to the beginning of the next extent. */
2103 assert(hole
== start
);
2104 *pnum
= MIN(nb_sectors
, (data
- start
) / BDRV_SECTOR_SIZE
);
2105 ret
= BDRV_BLOCK_ZERO
;
2108 return ret
| BDRV_BLOCK_OFFSET_VALID
| start
;
2111 static coroutine_fn BlockAIOCB
*raw_aio_pdiscard(BlockDriverState
*bs
,
2112 int64_t offset
, int count
,
2113 BlockCompletionFunc
*cb
, void *opaque
)
2115 BDRVRawState
*s
= bs
->opaque
;
2117 return paio_submit(bs
, s
->fd
, offset
, NULL
, count
,
2118 cb
, opaque
, QEMU_AIO_DISCARD
);
2121 static int coroutine_fn
raw_co_pwrite_zeroes(
2122 BlockDriverState
*bs
, int64_t offset
,
2123 int count
, BdrvRequestFlags flags
)
2125 BDRVRawState
*s
= bs
->opaque
;
2127 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
2128 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2129 QEMU_AIO_WRITE_ZEROES
);
2130 } else if (s
->discard_zeroes
) {
2131 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2137 static int raw_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
2139 BDRVRawState
*s
= bs
->opaque
;
2141 bdi
->unallocated_blocks_are_zero
= s
->discard_zeroes
;
2142 bdi
->can_write_zeroes_with_unmap
= s
->discard_zeroes
;
2146 static QemuOptsList raw_create_opts
= {
2147 .name
= "raw-create-opts",
2148 .head
= QTAILQ_HEAD_INITIALIZER(raw_create_opts
.head
),
2151 .name
= BLOCK_OPT_SIZE
,
2152 .type
= QEMU_OPT_SIZE
,
2153 .help
= "Virtual disk size"
2156 .name
= BLOCK_OPT_NOCOW
,
2157 .type
= QEMU_OPT_BOOL
,
2158 .help
= "Turn off copy-on-write (valid only on btrfs)"
2161 .name
= BLOCK_OPT_PREALLOC
,
2162 .type
= QEMU_OPT_STRING
,
2163 .help
= "Preallocation mode (allowed values: off, falloc, full)"
2165 { /* end of list */ }
2169 static int raw_check_perm(BlockDriverState
*bs
, uint64_t perm
, uint64_t shared
,
2172 return raw_handle_perm_lock(bs
, RAW_PL_PREPARE
, perm
, shared
, errp
);
2175 static void raw_set_perm(BlockDriverState
*bs
, uint64_t perm
, uint64_t shared
)
2177 BDRVRawState
*s
= bs
->opaque
;
2178 raw_handle_perm_lock(bs
, RAW_PL_COMMIT
, perm
, shared
, NULL
);
2180 s
->shared_perm
= shared
;
2183 static void raw_abort_perm_update(BlockDriverState
*bs
)
2185 raw_handle_perm_lock(bs
, RAW_PL_ABORT
, 0, 0, NULL
);
2188 BlockDriver bdrv_file
= {
2189 .format_name
= "file",
2190 .protocol_name
= "file",
2191 .instance_size
= sizeof(BDRVRawState
),
2192 .bdrv_needs_filename
= true,
2193 .bdrv_probe
= NULL
, /* no probe for protocols */
2194 .bdrv_parse_filename
= raw_parse_filename
,
2195 .bdrv_file_open
= raw_open
,
2196 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2197 .bdrv_reopen_commit
= raw_reopen_commit
,
2198 .bdrv_reopen_abort
= raw_reopen_abort
,
2199 .bdrv_close
= raw_close
,
2200 .bdrv_create
= raw_create
,
2201 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
2202 .bdrv_co_get_block_status
= raw_co_get_block_status
,
2203 .bdrv_co_pwrite_zeroes
= raw_co_pwrite_zeroes
,
2205 .bdrv_co_preadv
= raw_co_preadv
,
2206 .bdrv_co_pwritev
= raw_co_pwritev
,
2207 .bdrv_aio_flush
= raw_aio_flush
,
2208 .bdrv_aio_pdiscard
= raw_aio_pdiscard
,
2209 .bdrv_refresh_limits
= raw_refresh_limits
,
2210 .bdrv_io_plug
= raw_aio_plug
,
2211 .bdrv_io_unplug
= raw_aio_unplug
,
2213 .bdrv_truncate
= raw_truncate
,
2214 .bdrv_getlength
= raw_getlength
,
2215 .bdrv_get_info
= raw_get_info
,
2216 .bdrv_get_allocated_file_size
2217 = raw_get_allocated_file_size
,
2218 .bdrv_check_perm
= raw_check_perm
,
2219 .bdrv_set_perm
= raw_set_perm
,
2220 .bdrv_abort_perm_update
= raw_abort_perm_update
,
2221 .create_opts
= &raw_create_opts
,
2224 /***********************************************/
2227 #if defined(__APPLE__) && defined(__MACH__)
2228 static kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
2229 CFIndex maxPathSize
, int flags
);
2230 static char *FindEjectableOpticalMedia(io_iterator_t
*mediaIterator
)
2232 kern_return_t kernResult
= KERN_FAILURE
;
2233 mach_port_t masterPort
;
2234 CFMutableDictionaryRef classesToMatch
;
2235 const char *matching_array
[] = {kIODVDMediaClass
, kIOCDMediaClass
};
2236 char *mediaType
= NULL
;
2238 kernResult
= IOMasterPort( MACH_PORT_NULL
, &masterPort
);
2239 if ( KERN_SUCCESS
!= kernResult
) {
2240 printf( "IOMasterPort returned %d\n", kernResult
);
2244 for (index
= 0; index
< ARRAY_SIZE(matching_array
); index
++) {
2245 classesToMatch
= IOServiceMatching(matching_array
[index
]);
2246 if (classesToMatch
== NULL
) {
2247 error_report("IOServiceMatching returned NULL for %s",
2248 matching_array
[index
]);
2251 CFDictionarySetValue(classesToMatch
, CFSTR(kIOMediaEjectableKey
),
2253 kernResult
= IOServiceGetMatchingServices(masterPort
, classesToMatch
,
2255 if (kernResult
!= KERN_SUCCESS
) {
2256 error_report("Note: IOServiceGetMatchingServices returned %d",
2261 /* If a match was found, leave the loop */
2262 if (*mediaIterator
!= 0) {
2263 DPRINTF("Matching using %s\n", matching_array
[index
]);
2264 mediaType
= g_strdup(matching_array
[index
]);
2271 kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
2272 CFIndex maxPathSize
, int flags
)
2274 io_object_t nextMedia
;
2275 kern_return_t kernResult
= KERN_FAILURE
;
2277 nextMedia
= IOIteratorNext( mediaIterator
);
2280 CFTypeRef bsdPathAsCFString
;
2281 bsdPathAsCFString
= IORegistryEntryCreateCFProperty( nextMedia
, CFSTR( kIOBSDNameKey
), kCFAllocatorDefault
, 0 );
2282 if ( bsdPathAsCFString
) {
2283 size_t devPathLength
;
2284 strcpy( bsdPath
, _PATH_DEV
);
2285 if (flags
& BDRV_O_NOCACHE
) {
2286 strcat(bsdPath
, "r");
2288 devPathLength
= strlen( bsdPath
);
2289 if ( CFStringGetCString( bsdPathAsCFString
, bsdPath
+ devPathLength
, maxPathSize
- devPathLength
, kCFStringEncodingASCII
) ) {
2290 kernResult
= KERN_SUCCESS
;
2292 CFRelease( bsdPathAsCFString
);
2294 IOObjectRelease( nextMedia
);
2300 /* Sets up a real cdrom for use in QEMU */
2301 static bool setup_cdrom(char *bsd_path
, Error
**errp
)
2303 int index
, num_of_test_partitions
= 2, fd
;
2304 char test_partition
[MAXPATHLEN
];
2305 bool partition_found
= false;
2307 /* look for a working partition */
2308 for (index
= 0; index
< num_of_test_partitions
; index
++) {
2309 snprintf(test_partition
, sizeof(test_partition
), "%ss%d", bsd_path
,
2311 fd
= qemu_open(test_partition
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
2313 partition_found
= true;
2319 /* if a working partition on the device was not found */
2320 if (partition_found
== false) {
2321 error_setg(errp
, "Failed to find a working partition on disc");
2323 DPRINTF("Using %s as optical disc\n", test_partition
);
2324 pstrcpy(bsd_path
, MAXPATHLEN
, test_partition
);
2326 return partition_found
;
2329 /* Prints directions on mounting and unmounting a device */
2330 static void print_unmounting_directions(const char *file_name
)
2332 error_report("If device %s is mounted on the desktop, unmount"
2333 " it first before using it in QEMU", file_name
);
2334 error_report("Command to unmount device: diskutil unmountDisk %s",
2336 error_report("Command to mount device: diskutil mountDisk %s", file_name
);
2339 #endif /* defined(__APPLE__) && defined(__MACH__) */
2341 static int hdev_probe_device(const char *filename
)
2345 /* allow a dedicated CD-ROM driver to match with a higher priority */
2346 if (strstart(filename
, "/dev/cdrom", NULL
))
2349 if (stat(filename
, &st
) >= 0 &&
2350 (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
))) {
2357 static int check_hdev_writable(BDRVRawState
*s
)
2359 #if defined(BLKROGET)
2360 /* Linux block devices can be configured "read-only" using blockdev(8).
2361 * This is independent of device node permissions and therefore open(2)
2362 * with O_RDWR succeeds. Actual writes fail with EPERM.
2364 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
2365 * check for read-only block devices so that Linux block devices behave
2371 if (fstat(s
->fd
, &st
)) {
2375 if (!S_ISBLK(st
.st_mode
)) {
2379 if (ioctl(s
->fd
, BLKROGET
, &readonly
) < 0) {
2386 #endif /* defined(BLKROGET) */
2390 static void hdev_parse_filename(const char *filename
, QDict
*options
,
2393 bdrv_parse_filename_strip_prefix(filename
, "host_device:", options
);
2396 static bool hdev_is_sg(BlockDriverState
*bs
)
2399 #if defined(__linux__)
2401 BDRVRawState
*s
= bs
->opaque
;
2403 struct sg_scsi_id scsiid
;
2407 if (stat(bs
->filename
, &st
) < 0 || !S_ISCHR(st
.st_mode
)) {
2411 ret
= ioctl(s
->fd
, SG_GET_VERSION_NUM
, &sg_version
);
2416 ret
= ioctl(s
->fd
, SG_GET_SCSI_ID
, &scsiid
);
2418 DPRINTF("SG device found: type=%d, version=%d\n",
2419 scsiid
.scsi_type
, sg_version
);
2428 static int hdev_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2431 BDRVRawState
*s
= bs
->opaque
;
2432 Error
*local_err
= NULL
;
2435 #if defined(__APPLE__) && defined(__MACH__)
2437 * Caution: while qdict_get_str() is fine, getting non-string types
2438 * would require more care. When @options come from -blockdev or
2439 * blockdev_add, its members are typed according to the QAPI
2440 * schema, but when they come from -drive, they're all QString.
2442 const char *filename
= qdict_get_str(options
, "filename");
2443 char bsd_path
[MAXPATHLEN
] = "";
2444 bool error_occurred
= false;
2446 /* If using a real cdrom */
2447 if (strcmp(filename
, "/dev/cdrom") == 0) {
2448 char *mediaType
= NULL
;
2449 kern_return_t ret_val
;
2450 io_iterator_t mediaIterator
= 0;
2452 mediaType
= FindEjectableOpticalMedia(&mediaIterator
);
2453 if (mediaType
== NULL
) {
2454 error_setg(errp
, "Please make sure your CD/DVD is in the optical"
2456 error_occurred
= true;
2457 goto hdev_open_Mac_error
;
2460 ret_val
= GetBSDPath(mediaIterator
, bsd_path
, sizeof(bsd_path
), flags
);
2461 if (ret_val
!= KERN_SUCCESS
) {
2462 error_setg(errp
, "Could not get BSD path for optical drive");
2463 error_occurred
= true;
2464 goto hdev_open_Mac_error
;
2467 /* If a real optical drive was not found */
2468 if (bsd_path
[0] == '\0') {
2469 error_setg(errp
, "Failed to obtain bsd path for optical drive");
2470 error_occurred
= true;
2471 goto hdev_open_Mac_error
;
2474 /* If using a cdrom disc and finding a partition on the disc failed */
2475 if (strncmp(mediaType
, kIOCDMediaClass
, 9) == 0 &&
2476 setup_cdrom(bsd_path
, errp
) == false) {
2477 print_unmounting_directions(bsd_path
);
2478 error_occurred
= true;
2479 goto hdev_open_Mac_error
;
2482 qdict_put_str(options
, "filename", bsd_path
);
2484 hdev_open_Mac_error
:
2486 if (mediaIterator
) {
2487 IOObjectRelease(mediaIterator
);
2489 if (error_occurred
) {
2493 #endif /* defined(__APPLE__) && defined(__MACH__) */
2495 s
->type
= FTYPE_FILE
;
2497 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2499 error_propagate(errp
, local_err
);
2500 #if defined(__APPLE__) && defined(__MACH__)
2502 filename
= bsd_path
;
2504 /* if a physical device experienced an error while being opened */
2505 if (strncmp(filename
, "/dev/", 5) == 0) {
2506 print_unmounting_directions(filename
);
2508 #endif /* defined(__APPLE__) && defined(__MACH__) */
2512 /* Since this does ioctl the device must be already opened */
2513 bs
->sg
= hdev_is_sg(bs
);
2515 if (flags
& BDRV_O_RDWR
) {
2516 ret
= check_hdev_writable(s
);
2519 error_setg_errno(errp
, -ret
, "The device is not writable");
2527 #if defined(__linux__)
2529 static BlockAIOCB
*hdev_aio_ioctl(BlockDriverState
*bs
,
2530 unsigned long int req
, void *buf
,
2531 BlockCompletionFunc
*cb
, void *opaque
)
2533 BDRVRawState
*s
= bs
->opaque
;
2534 RawPosixAIOData
*acb
;
2537 if (fd_open(bs
) < 0)
2540 acb
= g_new(RawPosixAIOData
, 1);
2542 acb
->aio_type
= QEMU_AIO_IOCTL
;
2543 acb
->aio_fildes
= s
->fd
;
2544 acb
->aio_offset
= 0;
2545 acb
->aio_ioctl_buf
= buf
;
2546 acb
->aio_ioctl_cmd
= req
;
2547 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
2548 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
2552 static int fd_open(BlockDriverState
*bs
)
2554 BDRVRawState
*s
= bs
->opaque
;
2556 /* this is just to ensure s->fd is sane (its called by io ops) */
2562 static coroutine_fn BlockAIOCB
*hdev_aio_pdiscard(BlockDriverState
*bs
,
2563 int64_t offset
, int count
,
2564 BlockCompletionFunc
*cb
, void *opaque
)
2566 BDRVRawState
*s
= bs
->opaque
;
2568 if (fd_open(bs
) < 0) {
2571 return paio_submit(bs
, s
->fd
, offset
, NULL
, count
,
2572 cb
, opaque
, QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2575 static coroutine_fn
int hdev_co_pwrite_zeroes(BlockDriverState
*bs
,
2576 int64_t offset
, int count
, BdrvRequestFlags flags
)
2578 BDRVRawState
*s
= bs
->opaque
;
2585 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
2586 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2587 QEMU_AIO_WRITE_ZEROES
|QEMU_AIO_BLKDEV
);
2588 } else if (s
->discard_zeroes
) {
2589 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2590 QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2595 static int hdev_create(const char *filename
, QemuOpts
*opts
,
2600 struct stat stat_buf
;
2601 int64_t total_size
= 0;
2604 /* This function is used by both protocol block drivers and therefore either
2605 * of these prefixes may be given.
2606 * The return value has to be stored somewhere, otherwise this is an error
2607 * due to -Werror=unused-value. */
2609 strstart(filename
, "host_device:", &filename
) ||
2610 strstart(filename
, "host_cdrom:" , &filename
);
2614 ret
= raw_normalize_devicepath(&filename
);
2616 error_setg_errno(errp
, -ret
, "Could not normalize device path");
2620 /* Read out options */
2621 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
2624 fd
= qemu_open(filename
, O_WRONLY
| O_BINARY
);
2627 error_setg_errno(errp
, -ret
, "Could not open device");
2631 if (fstat(fd
, &stat_buf
) < 0) {
2633 error_setg_errno(errp
, -ret
, "Could not stat device");
2634 } else if (!S_ISBLK(stat_buf
.st_mode
) && !S_ISCHR(stat_buf
.st_mode
)) {
2636 "The given file is neither a block nor a character device");
2638 } else if (lseek(fd
, 0, SEEK_END
) < total_size
) {
2639 error_setg(errp
, "Device is too small");
2647 static BlockDriver bdrv_host_device
= {
2648 .format_name
= "host_device",
2649 .protocol_name
= "host_device",
2650 .instance_size
= sizeof(BDRVRawState
),
2651 .bdrv_needs_filename
= true,
2652 .bdrv_probe_device
= hdev_probe_device
,
2653 .bdrv_parse_filename
= hdev_parse_filename
,
2654 .bdrv_file_open
= hdev_open
,
2655 .bdrv_close
= raw_close
,
2656 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2657 .bdrv_reopen_commit
= raw_reopen_commit
,
2658 .bdrv_reopen_abort
= raw_reopen_abort
,
2659 .bdrv_create
= hdev_create
,
2660 .create_opts
= &raw_create_opts
,
2661 .bdrv_co_pwrite_zeroes
= hdev_co_pwrite_zeroes
,
2663 .bdrv_co_preadv
= raw_co_preadv
,
2664 .bdrv_co_pwritev
= raw_co_pwritev
,
2665 .bdrv_aio_flush
= raw_aio_flush
,
2666 .bdrv_aio_pdiscard
= hdev_aio_pdiscard
,
2667 .bdrv_refresh_limits
= raw_refresh_limits
,
2668 .bdrv_io_plug
= raw_aio_plug
,
2669 .bdrv_io_unplug
= raw_aio_unplug
,
2671 .bdrv_truncate
= raw_truncate
,
2672 .bdrv_getlength
= raw_getlength
,
2673 .bdrv_get_info
= raw_get_info
,
2674 .bdrv_get_allocated_file_size
2675 = raw_get_allocated_file_size
,
2676 .bdrv_check_perm
= raw_check_perm
,
2677 .bdrv_set_perm
= raw_set_perm
,
2678 .bdrv_abort_perm_update
= raw_abort_perm_update
,
2679 .bdrv_probe_blocksizes
= hdev_probe_blocksizes
,
2680 .bdrv_probe_geometry
= hdev_probe_geometry
,
2682 /* generic scsi device */
2684 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2688 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2689 static void cdrom_parse_filename(const char *filename
, QDict
*options
,
2692 bdrv_parse_filename_strip_prefix(filename
, "host_cdrom:", options
);
2697 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2700 BDRVRawState
*s
= bs
->opaque
;
2704 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2705 return raw_open_common(bs
, options
, flags
, O_NONBLOCK
, errp
);
2708 static int cdrom_probe_device(const char *filename
)
2714 fd
= qemu_open(filename
, O_RDONLY
| O_NONBLOCK
);
2718 ret
= fstat(fd
, &st
);
2719 if (ret
== -1 || !S_ISBLK(st
.st_mode
)) {
2723 /* Attempt to detect via a CDROM specific ioctl */
2724 ret
= ioctl(fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2734 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2736 BDRVRawState
*s
= bs
->opaque
;
2739 ret
= ioctl(s
->fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2740 return ret
== CDS_DISC_OK
;
2743 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2745 BDRVRawState
*s
= bs
->opaque
;
2748 if (ioctl(s
->fd
, CDROMEJECT
, NULL
) < 0)
2749 perror("CDROMEJECT");
2751 if (ioctl(s
->fd
, CDROMCLOSETRAY
, NULL
) < 0)
2752 perror("CDROMEJECT");
2756 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2758 BDRVRawState
*s
= bs
->opaque
;
2760 if (ioctl(s
->fd
, CDROM_LOCKDOOR
, locked
) < 0) {
2762 * Note: an error can happen if the distribution automatically
2765 /* perror("CDROM_LOCKDOOR"); */
2769 static BlockDriver bdrv_host_cdrom
= {
2770 .format_name
= "host_cdrom",
2771 .protocol_name
= "host_cdrom",
2772 .instance_size
= sizeof(BDRVRawState
),
2773 .bdrv_needs_filename
= true,
2774 .bdrv_probe_device
= cdrom_probe_device
,
2775 .bdrv_parse_filename
= cdrom_parse_filename
,
2776 .bdrv_file_open
= cdrom_open
,
2777 .bdrv_close
= raw_close
,
2778 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2779 .bdrv_reopen_commit
= raw_reopen_commit
,
2780 .bdrv_reopen_abort
= raw_reopen_abort
,
2781 .bdrv_create
= hdev_create
,
2782 .create_opts
= &raw_create_opts
,
2785 .bdrv_co_preadv
= raw_co_preadv
,
2786 .bdrv_co_pwritev
= raw_co_pwritev
,
2787 .bdrv_aio_flush
= raw_aio_flush
,
2788 .bdrv_refresh_limits
= raw_refresh_limits
,
2789 .bdrv_io_plug
= raw_aio_plug
,
2790 .bdrv_io_unplug
= raw_aio_unplug
,
2792 .bdrv_truncate
= raw_truncate
,
2793 .bdrv_getlength
= raw_getlength
,
2794 .has_variable_length
= true,
2795 .bdrv_get_allocated_file_size
2796 = raw_get_allocated_file_size
,
2798 /* removable device support */
2799 .bdrv_is_inserted
= cdrom_is_inserted
,
2800 .bdrv_eject
= cdrom_eject
,
2801 .bdrv_lock_medium
= cdrom_lock_medium
,
2803 /* generic scsi device */
2804 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2806 #endif /* __linux__ */
2808 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2809 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2812 BDRVRawState
*s
= bs
->opaque
;
2813 Error
*local_err
= NULL
;
2818 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2820 error_propagate(errp
, local_err
);
2824 /* make sure the door isn't locked at this time */
2825 ioctl(s
->fd
, CDIOCALLOW
);
2829 static int cdrom_probe_device(const char *filename
)
2831 if (strstart(filename
, "/dev/cd", NULL
) ||
2832 strstart(filename
, "/dev/acd", NULL
))
2837 static int cdrom_reopen(BlockDriverState
*bs
)
2839 BDRVRawState
*s
= bs
->opaque
;
2843 * Force reread of possibly changed/newly loaded disc,
2844 * FreeBSD seems to not notice sometimes...
2848 fd
= qemu_open(bs
->filename
, s
->open_flags
, 0644);
2855 /* make sure the door isn't locked at this time */
2856 ioctl(s
->fd
, CDIOCALLOW
);
2860 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2862 return raw_getlength(bs
) > 0;
2865 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2867 BDRVRawState
*s
= bs
->opaque
;
2872 (void) ioctl(s
->fd
, CDIOCALLOW
);
2875 if (ioctl(s
->fd
, CDIOCEJECT
) < 0)
2876 perror("CDIOCEJECT");
2878 if (ioctl(s
->fd
, CDIOCCLOSE
) < 0)
2879 perror("CDIOCCLOSE");
2885 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2887 BDRVRawState
*s
= bs
->opaque
;
2891 if (ioctl(s
->fd
, (locked
? CDIOCPREVENT
: CDIOCALLOW
)) < 0) {
2893 * Note: an error can happen if the distribution automatically
2896 /* perror("CDROM_LOCKDOOR"); */
2900 static BlockDriver bdrv_host_cdrom
= {
2901 .format_name
= "host_cdrom",
2902 .protocol_name
= "host_cdrom",
2903 .instance_size
= sizeof(BDRVRawState
),
2904 .bdrv_needs_filename
= true,
2905 .bdrv_probe_device
= cdrom_probe_device
,
2906 .bdrv_parse_filename
= cdrom_parse_filename
,
2907 .bdrv_file_open
= cdrom_open
,
2908 .bdrv_close
= raw_close
,
2909 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2910 .bdrv_reopen_commit
= raw_reopen_commit
,
2911 .bdrv_reopen_abort
= raw_reopen_abort
,
2912 .bdrv_create
= hdev_create
,
2913 .create_opts
= &raw_create_opts
,
2915 .bdrv_co_preadv
= raw_co_preadv
,
2916 .bdrv_co_pwritev
= raw_co_pwritev
,
2917 .bdrv_aio_flush
= raw_aio_flush
,
2918 .bdrv_refresh_limits
= raw_refresh_limits
,
2919 .bdrv_io_plug
= raw_aio_plug
,
2920 .bdrv_io_unplug
= raw_aio_unplug
,
2922 .bdrv_truncate
= raw_truncate
,
2923 .bdrv_getlength
= raw_getlength
,
2924 .has_variable_length
= true,
2925 .bdrv_get_allocated_file_size
2926 = raw_get_allocated_file_size
,
2928 /* removable device support */
2929 .bdrv_is_inserted
= cdrom_is_inserted
,
2930 .bdrv_eject
= cdrom_eject
,
2931 .bdrv_lock_medium
= cdrom_lock_medium
,
2933 #endif /* __FreeBSD__ */
2935 static void bdrv_file_init(void)
2938 * Register all the drivers. Note that order is important, the driver
2939 * registered last will get probed first.
2941 bdrv_register(&bdrv_file
);
2942 bdrv_register(&bdrv_host_device
);
2944 bdrv_register(&bdrv_host_cdrom
);
2946 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2947 bdrv_register(&bdrv_host_cdrom
);
2951 block_init(bdrv_file_init
);