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
25 #include "qemu/osdep.h"
26 #include "qemu-common.h"
27 #include "qapi/error.h"
28 #include "qemu/cutils.h"
29 #include "qemu/error-report.h"
30 #include "block/block_int.h"
31 #include "qemu/module.h"
32 #include "qemu/option.h"
34 #include "block/thread-pool.h"
36 #include "block/raw-aio.h"
37 #include "qapi/qmp/qdict.h"
38 #include "qapi/qmp/qstring.h"
40 #include "scsi/pr-manager.h"
41 #include "scsi/constants.h"
43 #if defined(__APPLE__) && (__MACH__)
45 #include <sys/param.h>
46 #include <IOKit/IOKitLib.h>
47 #include <IOKit/IOBSD.h>
48 #include <IOKit/storage/IOMediaBSDClient.h>
49 #include <IOKit/storage/IOMedia.h>
50 #include <IOKit/storage/IOCDMedia.h>
51 //#include <IOKit/storage/IOCDTypes.h>
52 #include <IOKit/storage/IODVDMedia.h>
53 #include <CoreFoundation/CoreFoundation.h>
57 #define _POSIX_PTHREAD_SEMANTICS 1
61 #include <sys/ioctl.h>
62 #include <sys/param.h>
63 #include <sys/syscall.h>
64 #include <linux/cdrom.h>
67 #include <linux/hdreg.h>
73 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
76 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
77 #include <linux/falloc.h>
79 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
85 #include <sys/ioctl.h>
86 #include <sys/disklabel.h>
91 #include <sys/ioctl.h>
92 #include <sys/disklabel.h>
98 #include <sys/ioctl.h>
99 #include <sys/diskslice.h>
108 /* OS X does not have O_DSYNC */
111 #define O_DSYNC O_SYNC
112 #elif defined(O_FSYNC)
113 #define O_DSYNC O_FSYNC
117 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
119 #define O_DIRECT O_DSYNC
125 #define MAX_BLOCKSIZE 4096
127 /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes,
128 * leaving a few more bytes for its future use. */
129 #define RAW_LOCK_PERM_BASE 100
130 #define RAW_LOCK_SHARED_BASE 200
132 typedef struct BDRVRawState
{
139 /* The current permissions. */
141 uint64_t shared_perm
;
143 /* The perms bits whose corresponding bytes are already locked in
145 uint64_t locked_perm
;
146 uint64_t locked_shared_perm
;
149 int perm_change_flags
;
150 BDRVReopenState
*reopen_state
;
156 bool has_write_zeroes
:1;
157 bool discard_zeroes
:1;
158 bool use_linux_aio
:1;
159 bool page_cache_inconsistent
:1;
161 bool needs_alignment
;
163 bool check_cache_dropped
;
165 uint64_t discard_nb_ok
;
166 uint64_t discard_nb_failed
;
167 uint64_t discard_bytes_ok
;
173 typedef struct BDRVRawReopenState
{
177 bool check_cache_dropped
;
178 } BDRVRawReopenState
;
180 static int fd_open(BlockDriverState
*bs
);
181 static int64_t raw_getlength(BlockDriverState
*bs
);
183 typedef struct RawPosixAIOData
{
184 BlockDriverState
*bs
;
205 PreallocMode prealloc
;
211 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
212 static int cdrom_reopen(BlockDriverState
*bs
);
215 #if defined(__NetBSD__)
216 static int raw_normalize_devicepath(const char **filename
, Error
**errp
)
218 static char namebuf
[PATH_MAX
];
219 const char *dp
, *fname
;
223 dp
= strrchr(fname
, '/');
224 if (lstat(fname
, &sb
) < 0) {
225 error_setg_file_open(errp
, errno
, fname
);
229 if (!S_ISBLK(sb
.st_mode
)) {
234 snprintf(namebuf
, PATH_MAX
, "r%s", fname
);
236 snprintf(namebuf
, PATH_MAX
, "%.*s/r%s",
237 (int)(dp
- fname
), fname
, dp
+ 1);
240 warn_report("%s is a block device, using %s", fname
, *filename
);
245 static int raw_normalize_devicepath(const char **filename
, Error
**errp
)
252 * Get logical block size via ioctl. On success store it in @sector_size_p.
254 static int probe_logical_blocksize(int fd
, unsigned int *sector_size_p
)
256 unsigned int sector_size
;
257 bool success
= false;
261 static const unsigned long ioctl_list
[] = {
265 #ifdef DKIOCGETBLOCKSIZE
268 #ifdef DIOCGSECTORSIZE
273 /* Try a few ioctls to get the right size */
274 for (i
= 0; i
< (int)ARRAY_SIZE(ioctl_list
); i
++) {
275 if (ioctl(fd
, ioctl_list
[i
], §or_size
) >= 0) {
276 *sector_size_p
= sector_size
;
281 return success
? 0 : -errno
;
285 * Get physical block size of @fd.
286 * On success, store it in @blk_size and return 0.
287 * On failure, return -errno.
289 static int probe_physical_blocksize(int fd
, unsigned int *blk_size
)
292 if (ioctl(fd
, BLKPBSZGET
, blk_size
) < 0) {
301 /* Check if read is allowed with given memory buffer and length.
303 * This function is used to check O_DIRECT memory buffer and request alignment.
305 static bool raw_is_io_aligned(int fd
, void *buf
, size_t len
)
307 ssize_t ret
= pread(fd
, buf
, len
, 0);
314 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
315 * other errors (e.g. real I/O error), which could happen on a failed
316 * drive, since we only care about probing alignment.
318 if (errno
!= EINVAL
) {
326 static void raw_probe_alignment(BlockDriverState
*bs
, int fd
, Error
**errp
)
328 BDRVRawState
*s
= bs
->opaque
;
330 size_t max_align
= MAX(MAX_BLOCKSIZE
, qemu_real_host_page_size
);
331 size_t alignments
[] = {1, 512, 1024, 2048, 4096};
333 /* For SCSI generic devices the alignment is not really used.
334 With buffered I/O, we don't have any restrictions. */
335 if (bdrv_is_sg(bs
) || !s
->needs_alignment
) {
336 bs
->bl
.request_alignment
= 1;
341 bs
->bl
.request_alignment
= 0;
343 /* Let's try to use the logical blocksize for the alignment. */
344 if (probe_logical_blocksize(fd
, &bs
->bl
.request_alignment
) < 0) {
345 bs
->bl
.request_alignment
= 0;
350 if (xfsctl(NULL
, fd
, XFS_IOC_DIOINFO
, &da
) >= 0) {
351 bs
->bl
.request_alignment
= da
.d_miniosz
;
352 /* The kernel returns wrong information for d_mem */
353 /* s->buf_align = da.d_mem; */
359 * If we could not get the sizes so far, we can only guess them. First try
360 * to detect request alignment, since it is more likely to succeed. Then
361 * try to detect buf_align, which cannot be detected in some cases (e.g.
362 * Gluster). If buf_align cannot be detected, we fallback to the value of
366 if (!bs
->bl
.request_alignment
) {
369 buf
= qemu_memalign(max_align
, max_align
);
370 for (i
= 0; i
< ARRAY_SIZE(alignments
); i
++) {
371 align
= alignments
[i
];
372 if (raw_is_io_aligned(fd
, buf
, align
)) {
373 /* Fallback to safe value. */
374 bs
->bl
.request_alignment
= (align
!= 1) ? align
: max_align
;
384 buf
= qemu_memalign(max_align
, 2 * max_align
);
385 for (i
= 0; i
< ARRAY_SIZE(alignments
); i
++) {
386 align
= alignments
[i
];
387 if (raw_is_io_aligned(fd
, buf
+ align
, max_align
)) {
388 /* Fallback to request_alignment. */
389 s
->buf_align
= (align
!= 1) ? align
: bs
->bl
.request_alignment
;
396 if (!s
->buf_align
|| !bs
->bl
.request_alignment
) {
397 error_setg(errp
, "Could not find working O_DIRECT alignment");
398 error_append_hint(errp
, "Try cache.direct=off\n");
402 static void raw_parse_flags(int bdrv_flags
, int *open_flags
, bool has_writers
)
404 bool read_write
= false;
405 assert(open_flags
!= NULL
);
407 *open_flags
|= O_BINARY
;
408 *open_flags
&= ~O_ACCMODE
;
410 if (bdrv_flags
& BDRV_O_AUTO_RDONLY
) {
411 read_write
= has_writers
;
412 } else if (bdrv_flags
& BDRV_O_RDWR
) {
417 *open_flags
|= O_RDWR
;
419 *open_flags
|= O_RDONLY
;
422 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
423 * and O_DIRECT for no caching. */
424 if ((bdrv_flags
& BDRV_O_NOCACHE
)) {
425 *open_flags
|= O_DIRECT
;
429 static void raw_parse_filename(const char *filename
, QDict
*options
,
432 bdrv_parse_filename_strip_prefix(filename
, "file:", options
);
435 static QemuOptsList raw_runtime_opts
= {
437 .head
= QTAILQ_HEAD_INITIALIZER(raw_runtime_opts
.head
),
441 .type
= QEMU_OPT_STRING
,
442 .help
= "File name of the image",
446 .type
= QEMU_OPT_STRING
,
447 .help
= "host AIO implementation (threads, native)",
451 .type
= QEMU_OPT_STRING
,
452 .help
= "file locking mode (on/off/auto, default: auto)",
455 .name
= "pr-manager",
456 .type
= QEMU_OPT_STRING
,
457 .help
= "id of persistent reservation manager object (default: none)",
459 #if defined(__linux__)
461 .name
= "drop-cache",
462 .type
= QEMU_OPT_BOOL
,
463 .help
= "invalidate page cache during live migration (default: on)",
467 .name
= "x-check-cache-dropped",
468 .type
= QEMU_OPT_BOOL
,
469 .help
= "check that page cache was dropped on live migration (default: off)"
471 { /* end of list */ }
475 static const char *const mutable_opts
[] = { "x-check-cache-dropped", NULL
};
477 static int raw_open_common(BlockDriverState
*bs
, QDict
*options
,
478 int bdrv_flags
, int open_flags
,
479 bool device
, Error
**errp
)
481 BDRVRawState
*s
= bs
->opaque
;
483 Error
*local_err
= NULL
;
484 const char *filename
= NULL
;
486 BlockdevAioOptions aio
, aio_default
;
491 opts
= qemu_opts_create(&raw_runtime_opts
, NULL
, 0, &error_abort
);
492 qemu_opts_absorb_qdict(opts
, options
, &local_err
);
494 error_propagate(errp
, local_err
);
499 filename
= qemu_opt_get(opts
, "filename");
501 ret
= raw_normalize_devicepath(&filename
, errp
);
506 aio_default
= (bdrv_flags
& BDRV_O_NATIVE_AIO
)
507 ? BLOCKDEV_AIO_OPTIONS_NATIVE
508 : BLOCKDEV_AIO_OPTIONS_THREADS
;
509 aio
= qapi_enum_parse(&BlockdevAioOptions_lookup
,
510 qemu_opt_get(opts
, "aio"),
511 aio_default
, &local_err
);
513 error_propagate(errp
, local_err
);
517 s
->use_linux_aio
= (aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
);
519 locking
= qapi_enum_parse(&OnOffAuto_lookup
,
520 qemu_opt_get(opts
, "locking"),
521 ON_OFF_AUTO_AUTO
, &local_err
);
523 error_propagate(errp
, local_err
);
530 if (!qemu_has_ofd_lock()) {
531 warn_report("File lock requested but OFD locking syscall is "
532 "unavailable, falling back to POSIX file locks");
533 error_printf("Due to the implementation, locks can be lost "
537 case ON_OFF_AUTO_OFF
:
540 case ON_OFF_AUTO_AUTO
:
541 s
->use_lock
= qemu_has_ofd_lock();
547 str
= qemu_opt_get(opts
, "pr-manager");
549 s
->pr_mgr
= pr_manager_lookup(str
, &local_err
);
551 error_propagate(errp
, local_err
);
557 s
->drop_cache
= qemu_opt_get_bool(opts
, "drop-cache", true);
558 s
->check_cache_dropped
= qemu_opt_get_bool(opts
, "x-check-cache-dropped",
561 s
->open_flags
= open_flags
;
562 raw_parse_flags(bdrv_flags
, &s
->open_flags
, false);
565 fd
= qemu_open(filename
, s
->open_flags
, 0644);
566 ret
= fd
< 0 ? -errno
: 0;
569 error_setg_file_open(errp
, -ret
, filename
);
578 s
->shared_perm
= BLK_PERM_ALL
;
580 #ifdef CONFIG_LINUX_AIO
581 /* Currently Linux does AIO only for files opened with O_DIRECT */
582 if (s
->use_linux_aio
) {
583 if (!(s
->open_flags
& O_DIRECT
)) {
584 error_setg(errp
, "aio=native was specified, but it requires "
585 "cache.direct=on, which was not specified.");
589 if (!aio_setup_linux_aio(bdrv_get_aio_context(bs
), errp
)) {
590 error_prepend(errp
, "Unable to use native AIO: ");
595 if (s
->use_linux_aio
) {
596 error_setg(errp
, "aio=native was specified, but is not supported "
601 #endif /* !defined(CONFIG_LINUX_AIO) */
603 s
->has_discard
= true;
604 s
->has_write_zeroes
= true;
605 if ((bs
->open_flags
& BDRV_O_NOCACHE
) != 0) {
606 s
->needs_alignment
= true;
609 if (fstat(s
->fd
, &st
) < 0) {
611 error_setg_errno(errp
, errno
, "Could not stat file");
616 if (S_ISBLK(st
.st_mode
)) {
617 warn_report("Opening a block device as a file using the '%s' "
618 "driver is deprecated", bs
->drv
->format_name
);
619 } else if (S_ISCHR(st
.st_mode
)) {
620 warn_report("Opening a character device as a file using the '%s' "
621 "driver is deprecated", bs
->drv
->format_name
);
622 } else if (!S_ISREG(st
.st_mode
)) {
623 error_setg(errp
, "A regular file was expected by the '%s' driver, "
624 "but something else was given", bs
->drv
->format_name
);
628 s
->discard_zeroes
= true;
629 s
->has_fallocate
= true;
632 if (!(S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
))) {
633 error_setg(errp
, "'%s' driver expects either "
634 "a character or block device", bs
->drv
->format_name
);
640 if (S_ISBLK(st
.st_mode
)) {
641 #ifdef BLKDISCARDZEROES
643 if (ioctl(s
->fd
, BLKDISCARDZEROES
, &arg
) == 0 && arg
) {
644 s
->discard_zeroes
= true;
648 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
649 * not rely on the contents of discarded blocks unless using O_DIRECT.
650 * Same for BLKZEROOUT.
652 if (!(bs
->open_flags
& BDRV_O_NOCACHE
)) {
653 s
->discard_zeroes
= false;
654 s
->has_write_zeroes
= false;
659 if (S_ISCHR(st
.st_mode
)) {
661 * The file is a char device (disk), which on FreeBSD isn't behind
662 * a pager, so force all requests to be aligned. This is needed
663 * so QEMU makes sure all IO operations on the device are aligned
664 * to sector size, or else FreeBSD will reject them with EINVAL.
666 s
->needs_alignment
= true;
671 if (platform_test_xfs_fd(s
->fd
)) {
676 bs
->supported_zero_flags
= BDRV_REQ_MAY_UNMAP
| BDRV_REQ_NO_FALLBACK
;
679 if (filename
&& (bdrv_flags
& BDRV_O_TEMPORARY
)) {
686 static int raw_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
689 BDRVRawState
*s
= bs
->opaque
;
691 s
->type
= FTYPE_FILE
;
692 return raw_open_common(bs
, options
, flags
, 0, false, errp
);
701 #define PERM_FOREACH(i) \
702 for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++)
704 /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the
705 * file; if @unlock == true, also unlock the unneeded bytes.
706 * @shared_perm_lock_bits is the mask of all permissions that are NOT shared.
708 static int raw_apply_lock_bytes(BDRVRawState
*s
, int fd
,
709 uint64_t perm_lock_bits
,
710 uint64_t shared_perm_lock_bits
,
711 bool unlock
, Error
**errp
)
715 uint64_t locked_perm
, locked_shared_perm
;
718 locked_perm
= s
->locked_perm
;
719 locked_shared_perm
= s
->locked_shared_perm
;
722 * We don't have the previous bits, just lock/unlock for each of the
726 locked_perm
= BLK_PERM_ALL
;
727 locked_shared_perm
= BLK_PERM_ALL
;
730 locked_shared_perm
= 0;
735 int off
= RAW_LOCK_PERM_BASE
+ i
;
736 uint64_t bit
= (1ULL << i
);
737 if ((perm_lock_bits
& bit
) && !(locked_perm
& bit
)) {
738 ret
= qemu_lock_fd(fd
, off
, 1, false);
740 error_setg(errp
, "Failed to lock byte %d", off
);
743 s
->locked_perm
|= bit
;
745 } else if (unlock
&& (locked_perm
& bit
) && !(perm_lock_bits
& bit
)) {
746 ret
= qemu_unlock_fd(fd
, off
, 1);
748 error_setg(errp
, "Failed to unlock byte %d", off
);
751 s
->locked_perm
&= ~bit
;
756 int off
= RAW_LOCK_SHARED_BASE
+ i
;
757 uint64_t bit
= (1ULL << i
);
758 if ((shared_perm_lock_bits
& bit
) && !(locked_shared_perm
& bit
)) {
759 ret
= qemu_lock_fd(fd
, off
, 1, false);
761 error_setg(errp
, "Failed to lock byte %d", off
);
764 s
->locked_shared_perm
|= bit
;
766 } else if (unlock
&& (locked_shared_perm
& bit
) &&
767 !(shared_perm_lock_bits
& bit
)) {
768 ret
= qemu_unlock_fd(fd
, off
, 1);
770 error_setg(errp
, "Failed to unlock byte %d", off
);
773 s
->locked_shared_perm
&= ~bit
;
780 /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */
781 static int raw_check_lock_bytes(int fd
, uint64_t perm
, uint64_t shared_perm
,
788 int off
= RAW_LOCK_SHARED_BASE
+ i
;
789 uint64_t p
= 1ULL << i
;
791 ret
= qemu_lock_fd_test(fd
, off
, 1, true);
793 char *perm_name
= bdrv_perm_names(p
);
795 "Failed to get \"%s\" lock",
803 int off
= RAW_LOCK_PERM_BASE
+ i
;
804 uint64_t p
= 1ULL << i
;
805 if (!(shared_perm
& p
)) {
806 ret
= qemu_lock_fd_test(fd
, off
, 1, true);
808 char *perm_name
= bdrv_perm_names(p
);
810 "Failed to get shared \"%s\" lock",
820 static int raw_handle_perm_lock(BlockDriverState
*bs
,
822 uint64_t new_perm
, uint64_t new_shared
,
825 BDRVRawState
*s
= bs
->opaque
;
827 Error
*local_err
= NULL
;
833 if (bdrv_get_flags(bs
) & BDRV_O_INACTIVE
) {
839 if ((s
->perm
| new_perm
) == s
->perm
&&
840 (s
->shared_perm
& new_shared
) == s
->shared_perm
)
843 * We are going to unlock bytes, it should not fail. If it fail due
844 * to some fs-dependent permission-unrelated reasons (which occurs
845 * sometimes on NFS and leads to abort in bdrv_replace_child) we
846 * can't prevent such errors by any check here. And we ignore them
847 * anyway in ABORT and COMMIT.
851 ret
= raw_apply_lock_bytes(s
, s
->fd
, s
->perm
| new_perm
,
852 ~s
->shared_perm
| ~new_shared
,
855 ret
= raw_check_lock_bytes(s
->fd
, new_perm
, new_shared
, errp
);
859 error_append_hint(errp
,
860 "Is another process using the image [%s]?\n",
864 /* fall through to unlock bytes. */
866 raw_apply_lock_bytes(s
, s
->fd
, s
->perm
, ~s
->shared_perm
,
869 /* Theoretically the above call only unlocks bytes and it cannot
870 * fail. Something weird happened, report it.
872 warn_report_err(local_err
);
876 raw_apply_lock_bytes(s
, s
->fd
, new_perm
, ~new_shared
,
879 /* Theoretically the above call only unlocks bytes and it cannot
880 * fail. Something weird happened, report it.
882 warn_report_err(local_err
);
889 static int raw_reconfigure_getfd(BlockDriverState
*bs
, int flags
,
890 int *open_flags
, uint64_t perm
, bool force_dup
,
893 BDRVRawState
*s
= bs
->opaque
;
896 bool has_writers
= perm
&
897 (BLK_PERM_WRITE
| BLK_PERM_WRITE_UNCHANGED
| BLK_PERM_RESIZE
);
898 int fcntl_flags
= O_APPEND
| O_NONBLOCK
;
900 fcntl_flags
|= O_NOATIME
;
904 if (s
->type
== FTYPE_CD
) {
905 *open_flags
|= O_NONBLOCK
;
908 raw_parse_flags(flags
, open_flags
, has_writers
);
911 /* Not all operating systems have O_ASYNC, and those that don't
912 * will not let us track the state into rs->open_flags (typically
913 * you achieve the same effect with an ioctl, for example I_SETSIG
914 * on Solaris). But we do not use O_ASYNC, so that's fine.
916 assert((s
->open_flags
& O_ASYNC
) == 0);
919 if (!force_dup
&& *open_flags
== s
->open_flags
) {
920 /* We're lucky, the existing fd is fine */
924 if ((*open_flags
& ~fcntl_flags
) == (s
->open_flags
& ~fcntl_flags
)) {
925 /* dup the original fd */
926 fd
= qemu_dup(s
->fd
);
928 ret
= fcntl_setfl(fd
, *open_flags
);
936 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
938 const char *normalized_filename
= bs
->filename
;
939 ret
= raw_normalize_devicepath(&normalized_filename
, errp
);
941 assert(!(*open_flags
& O_CREAT
));
942 fd
= qemu_open(normalized_filename
, *open_flags
);
944 error_setg_errno(errp
, errno
, "Could not reopen file");
953 static int raw_reopen_prepare(BDRVReopenState
*state
,
954 BlockReopenQueue
*queue
, Error
**errp
)
957 BDRVRawReopenState
*rs
;
960 Error
*local_err
= NULL
;
962 assert(state
!= NULL
);
963 assert(state
->bs
!= NULL
);
965 s
= state
->bs
->opaque
;
967 state
->opaque
= g_new0(BDRVRawReopenState
, 1);
970 /* Handle options changes */
971 opts
= qemu_opts_create(&raw_runtime_opts
, NULL
, 0, &error_abort
);
972 qemu_opts_absorb_qdict(opts
, state
->options
, &local_err
);
974 error_propagate(errp
, local_err
);
979 rs
->drop_cache
= qemu_opt_get_bool_del(opts
, "drop-cache", true);
980 rs
->check_cache_dropped
=
981 qemu_opt_get_bool_del(opts
, "x-check-cache-dropped", false);
983 /* This driver's reopen function doesn't currently allow changing
984 * other options, so let's put them back in the original QDict and
985 * bdrv_reopen_prepare() will detect changes and complain. */
986 qemu_opts_to_qdict(opts
, state
->options
);
988 rs
->fd
= raw_reconfigure_getfd(state
->bs
, state
->flags
, &rs
->open_flags
,
989 state
->perm
, true, &local_err
);
991 error_propagate(errp
, local_err
);
996 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
997 * alignment with the new fd. */
999 raw_probe_alignment(state
->bs
, rs
->fd
, &local_err
);
1001 error_propagate(errp
, local_err
);
1007 s
->reopen_state
= state
;
1015 qemu_opts_del(opts
);
1019 static void raw_reopen_commit(BDRVReopenState
*state
)
1021 BDRVRawReopenState
*rs
= state
->opaque
;
1022 BDRVRawState
*s
= state
->bs
->opaque
;
1024 s
->drop_cache
= rs
->drop_cache
;
1025 s
->check_cache_dropped
= rs
->check_cache_dropped
;
1026 s
->open_flags
= rs
->open_flags
;
1031 g_free(state
->opaque
);
1032 state
->opaque
= NULL
;
1034 assert(s
->reopen_state
== state
);
1035 s
->reopen_state
= NULL
;
1039 static void raw_reopen_abort(BDRVReopenState
*state
)
1041 BDRVRawReopenState
*rs
= state
->opaque
;
1042 BDRVRawState
*s
= state
->bs
->opaque
;
1044 /* nothing to do if NULL, we didn't get far enough */
1053 g_free(state
->opaque
);
1054 state
->opaque
= NULL
;
1056 assert(s
->reopen_state
== state
);
1057 s
->reopen_state
= NULL
;
1060 static int sg_get_max_transfer_length(int fd
)
1065 if (ioctl(fd
, BLKSECTGET
, &max_bytes
) == 0) {
1075 static int sg_get_max_segments(int fd
)
1080 char *sysfspath
= NULL
;
1086 if (fstat(fd
, &st
)) {
1091 sysfspath
= g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
1092 major(st
.st_rdev
), minor(st
.st_rdev
));
1093 sysfd
= open(sysfspath
, O_RDONLY
);
1099 ret
= read(sysfd
, buf
, sizeof(buf
) - 1);
1100 } while (ret
== -1 && errno
== EINTR
);
1104 } else if (ret
== 0) {
1109 /* The file is ended with '\n', pass 'end' to accept that. */
1110 ret
= qemu_strtol(buf
, &end
, 10, &max_segments
);
1111 if (ret
== 0 && end
&& *end
== '\n') {
1126 static void raw_refresh_limits(BlockDriverState
*bs
, Error
**errp
)
1128 BDRVRawState
*s
= bs
->opaque
;
1131 int ret
= sg_get_max_transfer_length(s
->fd
);
1133 if (ret
> 0 && ret
<= BDRV_REQUEST_MAX_BYTES
) {
1134 bs
->bl
.max_transfer
= pow2floor(ret
);
1137 ret
= sg_get_max_segments(s
->fd
);
1139 bs
->bl
.max_transfer
= MIN(bs
->bl
.max_transfer
,
1140 ret
* qemu_real_host_page_size
);
1144 raw_probe_alignment(bs
, s
->fd
, errp
);
1145 bs
->bl
.min_mem_alignment
= s
->buf_align
;
1146 bs
->bl
.opt_mem_alignment
= MAX(s
->buf_align
, qemu_real_host_page_size
);
1149 static int check_for_dasd(int fd
)
1152 struct dasd_information2_t info
= {0};
1154 return ioctl(fd
, BIODASDINFO2
, &info
);
1161 * Try to get @bs's logical and physical block size.
1162 * On success, store them in @bsz and return zero.
1163 * On failure, return negative errno.
1165 static int hdev_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
)
1167 BDRVRawState
*s
= bs
->opaque
;
1170 /* If DASD, get blocksizes */
1171 if (check_for_dasd(s
->fd
) < 0) {
1174 ret
= probe_logical_blocksize(s
->fd
, &bsz
->log
);
1178 return probe_physical_blocksize(s
->fd
, &bsz
->phys
);
1182 * Try to get @bs's geometry: cyls, heads, sectors.
1183 * On success, store them in @geo and return 0.
1184 * On failure return -errno.
1185 * (Allows block driver to assign default geometry values that guest sees)
1188 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
1190 BDRVRawState
*s
= bs
->opaque
;
1191 struct hd_geometry ioctl_geo
= {0};
1193 /* If DASD, get its geometry */
1194 if (check_for_dasd(s
->fd
) < 0) {
1197 if (ioctl(s
->fd
, HDIO_GETGEO
, &ioctl_geo
) < 0) {
1200 /* HDIO_GETGEO may return success even though geo contains zeros
1201 (e.g. certain multipath setups) */
1202 if (!ioctl_geo
.heads
|| !ioctl_geo
.sectors
|| !ioctl_geo
.cylinders
) {
1205 /* Do not return a geometry for partition */
1206 if (ioctl_geo
.start
!= 0) {
1209 geo
->heads
= ioctl_geo
.heads
;
1210 geo
->sectors
= ioctl_geo
.sectors
;
1211 geo
->cylinders
= ioctl_geo
.cylinders
;
1215 #else /* __linux__ */
1216 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
1222 #if defined(__linux__)
1223 static int handle_aiocb_ioctl(void *opaque
)
1225 RawPosixAIOData
*aiocb
= opaque
;
1228 ret
= ioctl(aiocb
->aio_fildes
, aiocb
->ioctl
.cmd
, aiocb
->ioctl
.buf
);
1237 static int handle_aiocb_flush(void *opaque
)
1239 RawPosixAIOData
*aiocb
= opaque
;
1240 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1243 if (s
->page_cache_inconsistent
) {
1247 ret
= qemu_fdatasync(aiocb
->aio_fildes
);
1249 /* There is no clear definition of the semantics of a failing fsync(),
1250 * so we may have to assume the worst. The sad truth is that this
1251 * assumption is correct for Linux. Some pages are now probably marked
1252 * clean in the page cache even though they are inconsistent with the
1253 * on-disk contents. The next fdatasync() call would succeed, but no
1254 * further writeback attempt will be made. We can't get back to a state
1255 * in which we know what is on disk (we would have to rewrite
1256 * everything that was touched since the last fdatasync() at least), so
1257 * make bdrv_flush() fail permanently. Given that the behaviour isn't
1258 * really defined, I have little hope that other OSes are doing better.
1260 * Obviously, this doesn't affect O_DIRECT, which bypasses the page
1262 if ((s
->open_flags
& O_DIRECT
) == 0) {
1263 s
->page_cache_inconsistent
= true;
1270 #ifdef CONFIG_PREADV
1272 static bool preadv_present
= true;
1275 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1277 return preadv(fd
, iov
, nr_iov
, offset
);
1281 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1283 return pwritev(fd
, iov
, nr_iov
, offset
);
1288 static bool preadv_present
= false;
1291 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1297 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
1304 static ssize_t
handle_aiocb_rw_vector(RawPosixAIOData
*aiocb
)
1309 if (aiocb
->aio_type
& QEMU_AIO_WRITE
)
1310 len
= qemu_pwritev(aiocb
->aio_fildes
,
1315 len
= qemu_preadv(aiocb
->aio_fildes
,
1319 } while (len
== -1 && errno
== EINTR
);
1328 * Read/writes the data to/from a given linear buffer.
1330 * Returns the number of bytes handles or -errno in case of an error. Short
1331 * reads are only returned if the end of the file is reached.
1333 static ssize_t
handle_aiocb_rw_linear(RawPosixAIOData
*aiocb
, char *buf
)
1338 while (offset
< aiocb
->aio_nbytes
) {
1339 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
1340 len
= pwrite(aiocb
->aio_fildes
,
1341 (const char *)buf
+ offset
,
1342 aiocb
->aio_nbytes
- offset
,
1343 aiocb
->aio_offset
+ offset
);
1345 len
= pread(aiocb
->aio_fildes
,
1347 aiocb
->aio_nbytes
- offset
,
1348 aiocb
->aio_offset
+ offset
);
1350 if (len
== -1 && errno
== EINTR
) {
1352 } else if (len
== -1 && errno
== EINVAL
&&
1353 (aiocb
->bs
->open_flags
& BDRV_O_NOCACHE
) &&
1354 !(aiocb
->aio_type
& QEMU_AIO_WRITE
) &&
1356 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
1357 * after a short read. Assume that O_DIRECT short reads only occur
1358 * at EOF. Therefore this is a short read, not an I/O error.
1361 } else if (len
== -1) {
1364 } else if (len
== 0) {
1373 static int handle_aiocb_rw(void *opaque
)
1375 RawPosixAIOData
*aiocb
= opaque
;
1379 if (!(aiocb
->aio_type
& QEMU_AIO_MISALIGNED
)) {
1381 * If there is just a single buffer, and it is properly aligned
1382 * we can just use plain pread/pwrite without any problems.
1384 if (aiocb
->io
.niov
== 1) {
1385 nbytes
= handle_aiocb_rw_linear(aiocb
, aiocb
->io
.iov
->iov_base
);
1389 * We have more than one iovec, and all are properly aligned.
1391 * Try preadv/pwritev first and fall back to linearizing the
1392 * buffer if it's not supported.
1394 if (preadv_present
) {
1395 nbytes
= handle_aiocb_rw_vector(aiocb
);
1396 if (nbytes
== aiocb
->aio_nbytes
||
1397 (nbytes
< 0 && nbytes
!= -ENOSYS
)) {
1400 preadv_present
= false;
1404 * XXX(hch): short read/write. no easy way to handle the reminder
1405 * using these interfaces. For now retry using plain
1411 * Ok, we have to do it the hard way, copy all segments into
1412 * a single aligned buffer.
1414 buf
= qemu_try_blockalign(aiocb
->bs
, aiocb
->aio_nbytes
);
1420 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
1424 for (i
= 0; i
< aiocb
->io
.niov
; ++i
) {
1425 memcpy(p
, aiocb
->io
.iov
[i
].iov_base
, aiocb
->io
.iov
[i
].iov_len
);
1426 p
+= aiocb
->io
.iov
[i
].iov_len
;
1428 assert(p
- buf
== aiocb
->aio_nbytes
);
1431 nbytes
= handle_aiocb_rw_linear(aiocb
, buf
);
1432 if (!(aiocb
->aio_type
& QEMU_AIO_WRITE
)) {
1434 size_t count
= aiocb
->aio_nbytes
, copy
;
1437 for (i
= 0; i
< aiocb
->io
.niov
&& count
; ++i
) {
1439 if (copy
> aiocb
->io
.iov
[i
].iov_len
) {
1440 copy
= aiocb
->io
.iov
[i
].iov_len
;
1442 memcpy(aiocb
->io
.iov
[i
].iov_base
, p
, copy
);
1443 assert(count
>= copy
);
1452 if (nbytes
== aiocb
->aio_nbytes
) {
1454 } else if (nbytes
>= 0 && nbytes
< aiocb
->aio_nbytes
) {
1455 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
1458 iov_memset(aiocb
->io
.iov
, aiocb
->io
.niov
, nbytes
,
1459 0, aiocb
->aio_nbytes
- nbytes
);
1468 static int translate_err(int err
)
1470 if (err
== -ENODEV
|| err
== -ENOSYS
|| err
== -EOPNOTSUPP
||
1477 #ifdef CONFIG_FALLOCATE
1478 static int do_fallocate(int fd
, int mode
, off_t offset
, off_t len
)
1481 if (fallocate(fd
, mode
, offset
, len
) == 0) {
1484 } while (errno
== EINTR
);
1485 return translate_err(-errno
);
1489 static ssize_t
handle_aiocb_write_zeroes_block(RawPosixAIOData
*aiocb
)
1492 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1494 if (!s
->has_write_zeroes
) {
1499 /* The BLKZEROOUT implementation in the kernel doesn't set
1500 * BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow
1502 if (!(aiocb
->aio_type
& QEMU_AIO_NO_FALLBACK
)) {
1504 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1505 if (ioctl(aiocb
->aio_fildes
, BLKZEROOUT
, range
) == 0) {
1508 } while (errno
== EINTR
);
1510 ret
= translate_err(-errno
);
1511 if (ret
== -ENOTSUP
) {
1512 s
->has_write_zeroes
= false;
1520 static int handle_aiocb_write_zeroes(void *opaque
)
1522 RawPosixAIOData
*aiocb
= opaque
;
1523 #ifdef CONFIG_FALLOCATE
1524 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1528 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1529 return handle_aiocb_write_zeroes_block(aiocb
);
1532 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1533 if (s
->has_write_zeroes
) {
1534 int ret
= do_fallocate(s
->fd
, FALLOC_FL_ZERO_RANGE
,
1535 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1536 if (ret
== -EINVAL
) {
1538 * Allow falling back to pwrite for file systems that
1539 * do not support fallocate() for an unaligned byte range.
1543 if (ret
== 0 || ret
!= -ENOTSUP
) {
1546 s
->has_write_zeroes
= false;
1550 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1551 if (s
->has_discard
&& s
->has_fallocate
) {
1552 int ret
= do_fallocate(s
->fd
,
1553 FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1554 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1556 ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1557 if (ret
== 0 || ret
!= -ENOTSUP
) {
1560 s
->has_fallocate
= false;
1561 } else if (ret
!= -ENOTSUP
) {
1564 s
->has_discard
= false;
1569 #ifdef CONFIG_FALLOCATE
1570 /* Last resort: we are trying to extend the file with zeroed data. This
1571 * can be done via fallocate(fd, 0) */
1572 len
= bdrv_getlength(aiocb
->bs
);
1573 if (s
->has_fallocate
&& len
>= 0 && aiocb
->aio_offset
>= len
) {
1574 int ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1575 if (ret
== 0 || ret
!= -ENOTSUP
) {
1578 s
->has_fallocate
= false;
1585 static int handle_aiocb_write_zeroes_unmap(void *opaque
)
1587 RawPosixAIOData
*aiocb
= opaque
;
1588 BDRVRawState
*s G_GNUC_UNUSED
= aiocb
->bs
->opaque
;
1591 /* First try to write zeros and unmap at the same time */
1593 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1594 ret
= do_fallocate(s
->fd
, FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1595 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1596 if (ret
!= -ENOTSUP
) {
1601 /* If we couldn't manage to unmap while guaranteed that the area reads as
1602 * all-zero afterwards, just write zeroes without unmapping */
1603 ret
= handle_aiocb_write_zeroes(aiocb
);
1607 #ifndef HAVE_COPY_FILE_RANGE
1608 static off_t
copy_file_range(int in_fd
, off_t
*in_off
, int out_fd
,
1609 off_t
*out_off
, size_t len
, unsigned int flags
)
1611 #ifdef __NR_copy_file_range
1612 return syscall(__NR_copy_file_range
, in_fd
, in_off
, out_fd
,
1613 out_off
, len
, flags
);
1621 static int handle_aiocb_copy_range(void *opaque
)
1623 RawPosixAIOData
*aiocb
= opaque
;
1624 uint64_t bytes
= aiocb
->aio_nbytes
;
1625 off_t in_off
= aiocb
->aio_offset
;
1626 off_t out_off
= aiocb
->copy_range
.aio_offset2
;
1629 ssize_t ret
= copy_file_range(aiocb
->aio_fildes
, &in_off
,
1630 aiocb
->copy_range
.aio_fd2
, &out_off
,
1632 trace_file_copy_file_range(aiocb
->bs
, aiocb
->aio_fildes
, in_off
,
1633 aiocb
->copy_range
.aio_fd2
, out_off
, bytes
,
1636 /* No progress (e.g. when beyond EOF), let the caller fall back to
1655 static int handle_aiocb_discard(void *opaque
)
1657 RawPosixAIOData
*aiocb
= opaque
;
1658 int ret
= -EOPNOTSUPP
;
1659 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1661 if (!s
->has_discard
) {
1665 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1668 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1669 if (ioctl(aiocb
->aio_fildes
, BLKDISCARD
, range
) == 0) {
1672 } while (errno
== EINTR
);
1677 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1678 ret
= do_fallocate(s
->fd
, FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1679 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1683 ret
= translate_err(ret
);
1684 if (ret
== -ENOTSUP
) {
1685 s
->has_discard
= false;
1691 * Help alignment probing by allocating the first block.
1693 * When reading with direct I/O from unallocated area on Gluster backed by XFS,
1694 * reading succeeds regardless of request length. In this case we fallback to
1695 * safe alignment which is not optimal. Allocating the first block avoids this
1698 * fd may be opened with O_DIRECT, but we don't know the buffer alignment or
1699 * request alignment, so we use safe values.
1701 * Returns: 0 on success, -errno on failure. Since this is an optimization,
1702 * caller may ignore failures.
1704 static int allocate_first_block(int fd
, size_t max_size
)
1706 size_t write_size
= (max_size
< MAX_BLOCKSIZE
)
1709 size_t max_align
= MAX(MAX_BLOCKSIZE
, qemu_real_host_page_size
);
1714 buf
= qemu_memalign(max_align
, write_size
);
1715 memset(buf
, 0, write_size
);
1718 n
= pwrite(fd
, buf
, write_size
, 0);
1719 } while (n
== -1 && errno
== EINTR
);
1721 ret
= (n
== -1) ? -errno
: 0;
1727 static int handle_aiocb_truncate(void *opaque
)
1729 RawPosixAIOData
*aiocb
= opaque
;
1731 int64_t current_length
= 0;
1734 int fd
= aiocb
->aio_fildes
;
1735 int64_t offset
= aiocb
->aio_offset
;
1736 PreallocMode prealloc
= aiocb
->truncate
.prealloc
;
1737 Error
**errp
= aiocb
->truncate
.errp
;
1739 if (fstat(fd
, &st
) < 0) {
1741 error_setg_errno(errp
, -result
, "Could not stat file");
1745 current_length
= st
.st_size
;
1746 if (current_length
> offset
&& prealloc
!= PREALLOC_MODE_OFF
) {
1747 error_setg(errp
, "Cannot use preallocation for shrinking files");
1752 #ifdef CONFIG_POSIX_FALLOCATE
1753 case PREALLOC_MODE_FALLOC
:
1755 * Truncating before posix_fallocate() makes it about twice slower on
1756 * file systems that do not support fallocate(), trying to check if a
1757 * block is allocated before allocating it, so don't do that here.
1759 if (offset
!= current_length
) {
1760 result
= -posix_fallocate(fd
, current_length
,
1761 offset
- current_length
);
1763 /* posix_fallocate() doesn't set errno. */
1764 error_setg_errno(errp
, -result
,
1765 "Could not preallocate new data");
1766 } else if (current_length
== 0) {
1768 * posix_fallocate() uses fallocate() if the filesystem
1769 * supports it, or fallback to manually writing zeroes. If
1770 * fallocate() was used, unaligned reads from the fallocated
1771 * area in raw_probe_alignment() will succeed, hence we need to
1772 * allocate the first block.
1774 * Optimize future alignment probing; ignore failures.
1776 allocate_first_block(fd
, offset
);
1783 case PREALLOC_MODE_FULL
:
1785 int64_t num
= 0, left
= offset
- current_length
;
1789 * Knowing the final size from the beginning could allow the file
1790 * system driver to do less allocations and possibly avoid
1791 * fragmentation of the file.
1793 if (ftruncate(fd
, offset
) != 0) {
1795 error_setg_errno(errp
, -result
, "Could not resize file");
1799 buf
= g_malloc0(65536);
1801 seek_result
= lseek(fd
, current_length
, SEEK_SET
);
1802 if (seek_result
< 0) {
1804 error_setg_errno(errp
, -result
,
1805 "Failed to seek to the old end of file");
1810 num
= MIN(left
, 65536);
1811 result
= write(fd
, buf
, num
);
1813 if (errno
== EINTR
) {
1817 error_setg_errno(errp
, -result
,
1818 "Could not write zeros for preallocation");
1827 error_setg_errno(errp
, -result
,
1828 "Could not flush file to disk");
1834 case PREALLOC_MODE_OFF
:
1835 if (ftruncate(fd
, offset
) != 0) {
1837 error_setg_errno(errp
, -result
, "Could not resize file");
1838 } else if (current_length
== 0 && offset
> current_length
) {
1839 /* Optimize future alignment probing; ignore failures. */
1840 allocate_first_block(fd
, offset
);
1845 error_setg(errp
, "Unsupported preallocation mode: %s",
1846 PreallocMode_str(prealloc
));
1852 if (ftruncate(fd
, current_length
) < 0) {
1853 error_report("Failed to restore old file length: %s",
1862 static int coroutine_fn
raw_thread_pool_submit(BlockDriverState
*bs
,
1863 ThreadPoolFunc func
, void *arg
)
1865 /* @bs can be NULL, bdrv_get_aio_context() returns the main context then */
1866 ThreadPool
*pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1867 return thread_pool_submit_co(pool
, func
, arg
);
1870 static int coroutine_fn
raw_co_prw(BlockDriverState
*bs
, uint64_t offset
,
1871 uint64_t bytes
, QEMUIOVector
*qiov
, int type
)
1873 BDRVRawState
*s
= bs
->opaque
;
1874 RawPosixAIOData acb
;
1876 if (fd_open(bs
) < 0)
1880 * Check if the underlying device requires requests to be aligned,
1881 * and if the request we are trying to submit is aligned or not.
1882 * If this is the case tell the low-level driver that it needs
1883 * to copy the buffer.
1885 if (s
->needs_alignment
) {
1886 if (!bdrv_qiov_is_aligned(bs
, qiov
)) {
1887 type
|= QEMU_AIO_MISALIGNED
;
1888 #ifdef CONFIG_LINUX_AIO
1889 } else if (s
->use_linux_aio
) {
1890 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1891 assert(qiov
->size
== bytes
);
1892 return laio_co_submit(bs
, aio
, s
->fd
, offset
, qiov
, type
);
1897 acb
= (RawPosixAIOData
) {
1899 .aio_fildes
= s
->fd
,
1901 .aio_offset
= offset
,
1902 .aio_nbytes
= bytes
,
1909 assert(qiov
->size
== bytes
);
1910 return raw_thread_pool_submit(bs
, handle_aiocb_rw
, &acb
);
1913 static int coroutine_fn
raw_co_preadv(BlockDriverState
*bs
, uint64_t offset
,
1914 uint64_t bytes
, QEMUIOVector
*qiov
,
1917 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_READ
);
1920 static int coroutine_fn
raw_co_pwritev(BlockDriverState
*bs
, uint64_t offset
,
1921 uint64_t bytes
, QEMUIOVector
*qiov
,
1925 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_WRITE
);
1928 static void raw_aio_plug(BlockDriverState
*bs
)
1930 #ifdef CONFIG_LINUX_AIO
1931 BDRVRawState
*s
= bs
->opaque
;
1932 if (s
->use_linux_aio
) {
1933 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1934 laio_io_plug(bs
, aio
);
1939 static void raw_aio_unplug(BlockDriverState
*bs
)
1941 #ifdef CONFIG_LINUX_AIO
1942 BDRVRawState
*s
= bs
->opaque
;
1943 if (s
->use_linux_aio
) {
1944 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1945 laio_io_unplug(bs
, aio
);
1950 static int raw_co_flush_to_disk(BlockDriverState
*bs
)
1952 BDRVRawState
*s
= bs
->opaque
;
1953 RawPosixAIOData acb
;
1961 acb
= (RawPosixAIOData
) {
1963 .aio_fildes
= s
->fd
,
1964 .aio_type
= QEMU_AIO_FLUSH
,
1967 return raw_thread_pool_submit(bs
, handle_aiocb_flush
, &acb
);
1970 static void raw_aio_attach_aio_context(BlockDriverState
*bs
,
1971 AioContext
*new_context
)
1973 #ifdef CONFIG_LINUX_AIO
1974 BDRVRawState
*s
= bs
->opaque
;
1975 if (s
->use_linux_aio
) {
1977 if (!aio_setup_linux_aio(new_context
, &local_err
)) {
1978 error_reportf_err(local_err
, "Unable to use native AIO, "
1979 "falling back to thread pool: ");
1980 s
->use_linux_aio
= false;
1986 static void raw_close(BlockDriverState
*bs
)
1988 BDRVRawState
*s
= bs
->opaque
;
1997 * Truncates the given regular file @fd to @offset and, when growing, fills the
1998 * new space according to @prealloc.
2000 * Returns: 0 on success, -errno on failure.
2002 static int coroutine_fn
2003 raw_regular_truncate(BlockDriverState
*bs
, int fd
, int64_t offset
,
2004 PreallocMode prealloc
, Error
**errp
)
2006 RawPosixAIOData acb
;
2008 acb
= (RawPosixAIOData
) {
2011 .aio_type
= QEMU_AIO_TRUNCATE
,
2012 .aio_offset
= offset
,
2014 .prealloc
= prealloc
,
2019 return raw_thread_pool_submit(bs
, handle_aiocb_truncate
, &acb
);
2022 static int coroutine_fn
raw_co_truncate(BlockDriverState
*bs
, int64_t offset
,
2023 PreallocMode prealloc
, Error
**errp
)
2025 BDRVRawState
*s
= bs
->opaque
;
2029 if (fstat(s
->fd
, &st
)) {
2031 error_setg_errno(errp
, -ret
, "Failed to fstat() the file");
2035 if (S_ISREG(st
.st_mode
)) {
2036 return raw_regular_truncate(bs
, s
->fd
, offset
, prealloc
, errp
);
2039 if (prealloc
!= PREALLOC_MODE_OFF
) {
2040 error_setg(errp
, "Preallocation mode '%s' unsupported for this "
2041 "non-regular file", PreallocMode_str(prealloc
));
2045 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
2046 if (offset
> raw_getlength(bs
)) {
2047 error_setg(errp
, "Cannot grow device files");
2051 error_setg(errp
, "Resizing this file is not supported");
2059 static int64_t raw_getlength(BlockDriverState
*bs
)
2061 BDRVRawState
*s
= bs
->opaque
;
2067 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
2068 struct disklabel dl
;
2070 if (ioctl(fd
, DIOCGDINFO
, &dl
))
2072 return (uint64_t)dl
.d_secsize
*
2073 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
2077 #elif defined(__NetBSD__)
2078 static int64_t raw_getlength(BlockDriverState
*bs
)
2080 BDRVRawState
*s
= bs
->opaque
;
2086 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
2087 struct dkwedge_info dkw
;
2089 if (ioctl(fd
, DIOCGWEDGEINFO
, &dkw
) != -1) {
2090 return dkw
.dkw_size
* 512;
2092 struct disklabel dl
;
2094 if (ioctl(fd
, DIOCGDINFO
, &dl
))
2096 return (uint64_t)dl
.d_secsize
*
2097 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
2102 #elif defined(__sun__)
2103 static int64_t raw_getlength(BlockDriverState
*bs
)
2105 BDRVRawState
*s
= bs
->opaque
;
2106 struct dk_minfo minfo
;
2116 * Use the DKIOCGMEDIAINFO ioctl to read the size.
2118 ret
= ioctl(s
->fd
, DKIOCGMEDIAINFO
, &minfo
);
2120 return minfo
.dki_lbsize
* minfo
.dki_capacity
;
2124 * There are reports that lseek on some devices fails, but
2125 * irc discussion said that contingency on contingency was overkill.
2127 size
= lseek(s
->fd
, 0, SEEK_END
);
2133 #elif defined(CONFIG_BSD)
2134 static int64_t raw_getlength(BlockDriverState
*bs
)
2136 BDRVRawState
*s
= bs
->opaque
;
2140 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2149 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2152 if (!fstat(fd
, &sb
) && (S_IFCHR
& sb
.st_mode
)) {
2153 #ifdef DIOCGMEDIASIZE
2154 if (ioctl(fd
, DIOCGMEDIASIZE
, (off_t
*)&size
))
2155 #elif defined(DIOCGPART)
2158 if (ioctl(fd
, DIOCGPART
, &pi
) == 0)
2159 size
= pi
.media_size
;
2165 #if defined(__APPLE__) && defined(__MACH__)
2167 uint64_t sectors
= 0;
2168 uint32_t sector_size
= 0;
2170 if (ioctl(fd
, DKIOCGETBLOCKCOUNT
, §ors
) == 0
2171 && ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) == 0) {
2172 size
= sectors
* sector_size
;
2174 size
= lseek(fd
, 0LL, SEEK_END
);
2181 size
= lseek(fd
, 0LL, SEEK_END
);
2186 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2189 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
2190 if (size
== 2048LL * (unsigned)-1)
2192 /* XXX no disc? maybe we need to reopen... */
2193 if (size
<= 0 && !reopened
&& cdrom_reopen(bs
) >= 0) {
2200 size
= lseek(fd
, 0, SEEK_END
);
2208 static int64_t raw_getlength(BlockDriverState
*bs
)
2210 BDRVRawState
*s
= bs
->opaque
;
2219 size
= lseek(s
->fd
, 0, SEEK_END
);
2227 static int64_t raw_get_allocated_file_size(BlockDriverState
*bs
)
2230 BDRVRawState
*s
= bs
->opaque
;
2232 if (fstat(s
->fd
, &st
) < 0) {
2235 return (int64_t)st
.st_blocks
* 512;
2238 static int coroutine_fn
2239 raw_co_create(BlockdevCreateOptions
*options
, Error
**errp
)
2241 BlockdevCreateOptionsFile
*file_opts
;
2242 Error
*local_err
= NULL
;
2244 uint64_t perm
, shared
;
2247 /* Validate options and set default values */
2248 assert(options
->driver
== BLOCKDEV_DRIVER_FILE
);
2249 file_opts
= &options
->u
.file
;
2251 if (!file_opts
->has_nocow
) {
2252 file_opts
->nocow
= false;
2254 if (!file_opts
->has_preallocation
) {
2255 file_opts
->preallocation
= PREALLOC_MODE_OFF
;
2259 fd
= qemu_open(file_opts
->filename
, O_RDWR
| O_CREAT
| O_BINARY
, 0644);
2262 error_setg_errno(errp
, -result
, "Could not create file");
2266 /* Take permissions: We want to discard everything, so we need
2267 * BLK_PERM_WRITE; and truncation to the desired size requires
2269 * On the other hand, we cannot share the RESIZE permission
2270 * because we promise that after this function, the file has the
2271 * size given in the options. If someone else were to resize it
2272 * concurrently, we could not guarantee that.
2273 * Note that after this function, we can no longer guarantee that
2274 * the file is not touched by a third party, so it may be resized
2276 perm
= BLK_PERM_WRITE
| BLK_PERM_RESIZE
;
2277 shared
= BLK_PERM_ALL
& ~BLK_PERM_RESIZE
;
2279 /* Step one: Take locks */
2280 result
= raw_apply_lock_bytes(NULL
, fd
, perm
, ~shared
, false, errp
);
2285 /* Step two: Check that nobody else has taken conflicting locks */
2286 result
= raw_check_lock_bytes(fd
, perm
, shared
, errp
);
2288 error_append_hint(errp
,
2289 "Is another process using the image [%s]?\n",
2290 file_opts
->filename
);
2294 /* Clear the file by truncating it to 0 */
2295 result
= raw_regular_truncate(NULL
, fd
, 0, PREALLOC_MODE_OFF
, errp
);
2300 if (file_opts
->nocow
) {
2302 /* Set NOCOW flag to solve performance issue on fs like btrfs.
2303 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
2304 * will be ignored since any failure of this operation should not
2305 * block the left work.
2308 if (ioctl(fd
, FS_IOC_GETFLAGS
, &attr
) == 0) {
2309 attr
|= FS_NOCOW_FL
;
2310 ioctl(fd
, FS_IOC_SETFLAGS
, &attr
);
2315 /* Resize and potentially preallocate the file to the desired
2317 result
= raw_regular_truncate(NULL
, fd
, file_opts
->size
,
2318 file_opts
->preallocation
, errp
);
2324 raw_apply_lock_bytes(NULL
, fd
, 0, 0, true, &local_err
);
2326 /* The above call should not fail, and if it does, that does
2327 * not mean the whole creation operation has failed. So
2328 * report it the user for their convenience, but do not report
2329 * it to the caller. */
2330 warn_report_err(local_err
);
2334 if (qemu_close(fd
) != 0 && result
== 0) {
2336 error_setg_errno(errp
, -result
, "Could not close the new file");
2342 static int coroutine_fn
raw_co_create_opts(const char *filename
, QemuOpts
*opts
,
2345 BlockdevCreateOptions options
;
2346 int64_t total_size
= 0;
2348 PreallocMode prealloc
;
2350 Error
*local_err
= NULL
;
2352 /* Skip file: protocol prefix */
2353 strstart(filename
, "file:", &filename
);
2355 /* Read out options */
2356 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
2358 nocow
= qemu_opt_get_bool(opts
, BLOCK_OPT_NOCOW
, false);
2359 buf
= qemu_opt_get_del(opts
, BLOCK_OPT_PREALLOC
);
2360 prealloc
= qapi_enum_parse(&PreallocMode_lookup
, buf
,
2361 PREALLOC_MODE_OFF
, &local_err
);
2364 error_propagate(errp
, local_err
);
2368 options
= (BlockdevCreateOptions
) {
2369 .driver
= BLOCKDEV_DRIVER_FILE
,
2371 .filename
= (char *) filename
,
2373 .has_preallocation
= true,
2374 .preallocation
= prealloc
,
2379 return raw_co_create(&options
, errp
);
2383 * Find allocation range in @bs around offset @start.
2384 * May change underlying file descriptor's file offset.
2385 * If @start is not in a hole, store @start in @data, and the
2386 * beginning of the next hole in @hole, and return 0.
2387 * If @start is in a non-trailing hole, store @start in @hole and the
2388 * beginning of the next non-hole in @data, and return 0.
2389 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
2390 * If we can't find out, return a negative errno other than -ENXIO.
2392 static int find_allocation(BlockDriverState
*bs
, off_t start
,
2393 off_t
*data
, off_t
*hole
)
2395 #if defined SEEK_HOLE && defined SEEK_DATA
2396 BDRVRawState
*s
= bs
->opaque
;
2401 * D1. offs == start: start is in data
2402 * D2. offs > start: start is in a hole, next data at offs
2403 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
2404 * or start is beyond EOF
2405 * If the latter happens, the file has been truncated behind
2406 * our back since we opened it. All bets are off then.
2407 * Treating like a trailing hole is simplest.
2408 * D4. offs < 0, errno != ENXIO: we learned nothing
2410 offs
= lseek(s
->fd
, start
, SEEK_DATA
);
2412 return -errno
; /* D3 or D4 */
2416 /* This is not a valid return by lseek(). We are safe to just return
2417 * -EIO in this case, and we'll treat it like D4. */
2422 /* D2: in hole, next data at offs */
2428 /* D1: in data, end not yet known */
2432 * H1. offs == start: start is in a hole
2433 * If this happens here, a hole has been dug behind our back
2434 * since the previous lseek().
2435 * H2. offs > start: either start is in data, next hole at offs,
2436 * or start is in trailing hole, EOF at offs
2437 * Linux treats trailing holes like any other hole: offs ==
2438 * start. Solaris seeks to EOF instead: offs > start (blech).
2439 * If that happens here, a hole has been dug behind our back
2440 * since the previous lseek().
2441 * H3. offs < 0, errno = ENXIO: start is beyond EOF
2442 * If this happens, the file has been truncated behind our
2443 * back since we opened it. Treat it like a trailing hole.
2444 * H4. offs < 0, errno != ENXIO: we learned nothing
2445 * Pretend we know nothing at all, i.e. "forget" about D1.
2447 offs
= lseek(s
->fd
, start
, SEEK_HOLE
);
2449 return -errno
; /* D1 and (H3 or H4) */
2453 /* This is not a valid return by lseek(). We are safe to just return
2454 * -EIO in this case, and we'll treat it like H4. */
2460 * D1 and H2: either in data, next hole at offs, or it was in
2461 * data but is now in a trailing hole. In the latter case,
2462 * all bets are off. Treating it as if it there was data all
2463 * the way to EOF is safe, so simply do that.
2478 * Returns the allocation status of the specified offset.
2480 * The block layer guarantees 'offset' and 'bytes' are within bounds.
2482 * 'pnum' is set to the number of bytes (including and immediately following
2483 * the specified offset) that are known to be in the same
2484 * allocated/unallocated state.
2486 * 'bytes' is the max value 'pnum' should be set to.
2488 static int coroutine_fn
raw_co_block_status(BlockDriverState
*bs
,
2491 int64_t bytes
, int64_t *pnum
,
2493 BlockDriverState
**file
)
2495 off_t data
= 0, hole
= 0;
2498 assert(QEMU_IS_ALIGNED(offset
| bytes
, bs
->bl
.request_alignment
));
2509 return BDRV_BLOCK_DATA
| BDRV_BLOCK_OFFSET_VALID
;
2512 ret
= find_allocation(bs
, offset
, &data
, &hole
);
2513 if (ret
== -ENXIO
) {
2516 ret
= BDRV_BLOCK_ZERO
;
2517 } else if (ret
< 0) {
2518 /* No info available, so pretend there are no holes */
2520 ret
= BDRV_BLOCK_DATA
;
2521 } else if (data
== offset
) {
2522 /* On a data extent, compute bytes to the end of the extent,
2523 * possibly including a partial sector at EOF. */
2524 *pnum
= MIN(bytes
, hole
- offset
);
2527 * We are not allowed to return partial sectors, though, so
2528 * round up if necessary.
2530 if (!QEMU_IS_ALIGNED(*pnum
, bs
->bl
.request_alignment
)) {
2531 int64_t file_length
= raw_getlength(bs
);
2532 if (file_length
> 0) {
2533 /* Ignore errors, this is just a safeguard */
2534 assert(hole
== file_length
);
2536 *pnum
= ROUND_UP(*pnum
, bs
->bl
.request_alignment
);
2539 ret
= BDRV_BLOCK_DATA
;
2541 /* On a hole, compute bytes to the beginning of the next extent. */
2542 assert(hole
== offset
);
2543 *pnum
= MIN(bytes
, data
- offset
);
2544 ret
= BDRV_BLOCK_ZERO
;
2548 return ret
| BDRV_BLOCK_OFFSET_VALID
;
2551 #if defined(__linux__)
2552 /* Verify that the file is not in the page cache */
2553 static void check_cache_dropped(BlockDriverState
*bs
, Error
**errp
)
2555 const size_t window_size
= 128 * 1024 * 1024;
2556 BDRVRawState
*s
= bs
->opaque
;
2557 void *window
= NULL
;
2564 /* mincore(2) page status information requires 1 byte per page */
2565 page_size
= sysconf(_SC_PAGESIZE
);
2566 vec
= g_malloc(DIV_ROUND_UP(window_size
, page_size
));
2568 end
= raw_getlength(bs
);
2570 for (offset
= 0; offset
< end
; offset
+= window_size
) {
2577 /* Unmap previous window if size has changed */
2578 new_length
= MIN(end
- offset
, window_size
);
2579 if (new_length
!= length
) {
2580 munmap(window
, length
);
2585 new_window
= mmap(window
, new_length
, PROT_NONE
, MAP_PRIVATE
,
2587 if (new_window
== MAP_FAILED
) {
2588 error_setg_errno(errp
, errno
, "mmap failed");
2592 window
= new_window
;
2593 length
= new_length
;
2595 ret
= mincore(window
, length
, vec
);
2597 error_setg_errno(errp
, errno
, "mincore failed");
2601 vec_end
= DIV_ROUND_UP(length
, page_size
);
2602 for (i
= 0; i
< vec_end
; i
++) {
2604 error_setg(errp
, "page cache still in use!");
2611 munmap(window
, length
);
2616 #endif /* __linux__ */
2618 static void coroutine_fn
raw_co_invalidate_cache(BlockDriverState
*bs
,
2621 BDRVRawState
*s
= bs
->opaque
;
2626 error_setg_errno(errp
, -ret
, "The file descriptor is not open");
2630 if (!s
->drop_cache
) {
2634 if (s
->open_flags
& O_DIRECT
) {
2635 return; /* No host kernel page cache */
2638 #if defined(__linux__)
2639 /* This sets the scene for the next syscall... */
2640 ret
= bdrv_co_flush(bs
);
2642 error_setg_errno(errp
, -ret
, "flush failed");
2646 /* Linux does not invalidate pages that are dirty, locked, or mmapped by a
2647 * process. These limitations are okay because we just fsynced the file,
2648 * we don't use mmap, and the file should not be in use by other processes.
2650 ret
= posix_fadvise(s
->fd
, 0, 0, POSIX_FADV_DONTNEED
);
2651 if (ret
!= 0) { /* the return value is a positive errno */
2652 error_setg_errno(errp
, ret
, "fadvise failed");
2656 if (s
->check_cache_dropped
) {
2657 check_cache_dropped(bs
, errp
);
2659 #else /* __linux__ */
2660 /* Do nothing. Live migration to a remote host with cache.direct=off is
2661 * unsupported on other host operating systems. Cache consistency issues
2662 * may occur but no error is reported here, partly because that's the
2663 * historical behavior and partly because it's hard to differentiate valid
2664 * configurations that should not cause errors.
2666 #endif /* !__linux__ */
2669 static void raw_account_discard(BDRVRawState
*s
, uint64_t nbytes
, int ret
)
2672 s
->stats
.discard_nb_failed
++;
2674 s
->stats
.discard_nb_ok
++;
2675 s
->stats
.discard_bytes_ok
+= nbytes
;
2679 static coroutine_fn
int
2680 raw_do_pdiscard(BlockDriverState
*bs
, int64_t offset
, int bytes
, bool blkdev
)
2682 BDRVRawState
*s
= bs
->opaque
;
2683 RawPosixAIOData acb
;
2686 acb
= (RawPosixAIOData
) {
2688 .aio_fildes
= s
->fd
,
2689 .aio_type
= QEMU_AIO_DISCARD
,
2690 .aio_offset
= offset
,
2691 .aio_nbytes
= bytes
,
2695 acb
.aio_type
|= QEMU_AIO_BLKDEV
;
2698 ret
= raw_thread_pool_submit(bs
, handle_aiocb_discard
, &acb
);
2699 raw_account_discard(s
, bytes
, ret
);
2703 static coroutine_fn
int
2704 raw_co_pdiscard(BlockDriverState
*bs
, int64_t offset
, int bytes
)
2706 return raw_do_pdiscard(bs
, offset
, bytes
, false);
2709 static int coroutine_fn
2710 raw_do_pwrite_zeroes(BlockDriverState
*bs
, int64_t offset
, int bytes
,
2711 BdrvRequestFlags flags
, bool blkdev
)
2713 BDRVRawState
*s
= bs
->opaque
;
2714 RawPosixAIOData acb
;
2715 ThreadPoolFunc
*handler
;
2717 acb
= (RawPosixAIOData
) {
2719 .aio_fildes
= s
->fd
,
2720 .aio_type
= QEMU_AIO_WRITE_ZEROES
,
2721 .aio_offset
= offset
,
2722 .aio_nbytes
= bytes
,
2726 acb
.aio_type
|= QEMU_AIO_BLKDEV
;
2728 if (flags
& BDRV_REQ_NO_FALLBACK
) {
2729 acb
.aio_type
|= QEMU_AIO_NO_FALLBACK
;
2732 if (flags
& BDRV_REQ_MAY_UNMAP
) {
2733 acb
.aio_type
|= QEMU_AIO_DISCARD
;
2734 handler
= handle_aiocb_write_zeroes_unmap
;
2736 handler
= handle_aiocb_write_zeroes
;
2739 return raw_thread_pool_submit(bs
, handler
, &acb
);
2742 static int coroutine_fn
raw_co_pwrite_zeroes(
2743 BlockDriverState
*bs
, int64_t offset
,
2744 int bytes
, BdrvRequestFlags flags
)
2746 return raw_do_pwrite_zeroes(bs
, offset
, bytes
, flags
, false);
2749 static int raw_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
2751 BDRVRawState
*s
= bs
->opaque
;
2753 bdi
->unallocated_blocks_are_zero
= s
->discard_zeroes
;
2757 static BlockStatsSpecificFile
get_blockstats_specific_file(BlockDriverState
*bs
)
2759 BDRVRawState
*s
= bs
->opaque
;
2760 return (BlockStatsSpecificFile
) {
2761 .discard_nb_ok
= s
->stats
.discard_nb_ok
,
2762 .discard_nb_failed
= s
->stats
.discard_nb_failed
,
2763 .discard_bytes_ok
= s
->stats
.discard_bytes_ok
,
2767 static BlockStatsSpecific
*raw_get_specific_stats(BlockDriverState
*bs
)
2769 BlockStatsSpecific
*stats
= g_new(BlockStatsSpecific
, 1);
2771 stats
->driver
= BLOCKDEV_DRIVER_FILE
;
2772 stats
->u
.file
= get_blockstats_specific_file(bs
);
2777 static BlockStatsSpecific
*hdev_get_specific_stats(BlockDriverState
*bs
)
2779 BlockStatsSpecific
*stats
= g_new(BlockStatsSpecific
, 1);
2781 stats
->driver
= BLOCKDEV_DRIVER_HOST_DEVICE
;
2782 stats
->u
.host_device
= get_blockstats_specific_file(bs
);
2787 static QemuOptsList raw_create_opts
= {
2788 .name
= "raw-create-opts",
2789 .head
= QTAILQ_HEAD_INITIALIZER(raw_create_opts
.head
),
2792 .name
= BLOCK_OPT_SIZE
,
2793 .type
= QEMU_OPT_SIZE
,
2794 .help
= "Virtual disk size"
2797 .name
= BLOCK_OPT_NOCOW
,
2798 .type
= QEMU_OPT_BOOL
,
2799 .help
= "Turn off copy-on-write (valid only on btrfs)"
2802 .name
= BLOCK_OPT_PREALLOC
,
2803 .type
= QEMU_OPT_STRING
,
2804 .help
= "Preallocation mode (allowed values: off"
2805 #ifdef CONFIG_POSIX_FALLOCATE
2810 { /* end of list */ }
2814 static int raw_check_perm(BlockDriverState
*bs
, uint64_t perm
, uint64_t shared
,
2817 BDRVRawState
*s
= bs
->opaque
;
2818 BDRVRawReopenState
*rs
= NULL
;
2822 if (s
->perm_change_fd
) {
2824 * In the context of reopen, this function may be called several times
2825 * (directly and recursively while change permissions of the parent).
2826 * This is even true for children that don't inherit from the original
2827 * reopen node, so s->reopen_state is not set.
2829 * Ignore all but the first call.
2834 if (s
->reopen_state
) {
2835 /* We already have a new file descriptor to set permissions for */
2836 assert(s
->reopen_state
->perm
== perm
);
2837 assert(s
->reopen_state
->shared_perm
== shared
);
2838 rs
= s
->reopen_state
->opaque
;
2839 s
->perm_change_fd
= rs
->fd
;
2840 s
->perm_change_flags
= rs
->open_flags
;
2842 /* We may need a new fd if auto-read-only switches the mode */
2843 ret
= raw_reconfigure_getfd(bs
, bs
->open_flags
, &open_flags
, perm
,
2847 } else if (ret
!= s
->fd
) {
2848 s
->perm_change_fd
= ret
;
2849 s
->perm_change_flags
= open_flags
;
2853 /* Prepare permissions on old fd to avoid conflicts between old and new,
2854 * but keep everything locked that new will need. */
2855 ret
= raw_handle_perm_lock(bs
, RAW_PL_PREPARE
, perm
, shared
, errp
);
2860 /* Copy locks to the new fd */
2861 if (s
->perm_change_fd
) {
2862 ret
= raw_apply_lock_bytes(NULL
, s
->perm_change_fd
, perm
, ~shared
,
2865 raw_handle_perm_lock(bs
, RAW_PL_ABORT
, 0, 0, NULL
);
2872 if (s
->perm_change_fd
&& !s
->reopen_state
) {
2873 qemu_close(s
->perm_change_fd
);
2875 s
->perm_change_fd
= 0;
2879 static void raw_set_perm(BlockDriverState
*bs
, uint64_t perm
, uint64_t shared
)
2881 BDRVRawState
*s
= bs
->opaque
;
2883 /* For reopen, we have already switched to the new fd (.bdrv_set_perm is
2884 * called after .bdrv_reopen_commit) */
2885 if (s
->perm_change_fd
&& s
->fd
!= s
->perm_change_fd
) {
2887 s
->fd
= s
->perm_change_fd
;
2888 s
->open_flags
= s
->perm_change_flags
;
2890 s
->perm_change_fd
= 0;
2892 raw_handle_perm_lock(bs
, RAW_PL_COMMIT
, perm
, shared
, NULL
);
2894 s
->shared_perm
= shared
;
2897 static void raw_abort_perm_update(BlockDriverState
*bs
)
2899 BDRVRawState
*s
= bs
->opaque
;
2901 /* For reopen, .bdrv_reopen_abort is called afterwards and will close
2902 * the file descriptor. */
2903 if (s
->perm_change_fd
&& !s
->reopen_state
) {
2904 qemu_close(s
->perm_change_fd
);
2906 s
->perm_change_fd
= 0;
2908 raw_handle_perm_lock(bs
, RAW_PL_ABORT
, 0, 0, NULL
);
2911 static int coroutine_fn
raw_co_copy_range_from(
2912 BlockDriverState
*bs
, BdrvChild
*src
, uint64_t src_offset
,
2913 BdrvChild
*dst
, uint64_t dst_offset
, uint64_t bytes
,
2914 BdrvRequestFlags read_flags
, BdrvRequestFlags write_flags
)
2916 return bdrv_co_copy_range_to(src
, src_offset
, dst
, dst_offset
, bytes
,
2917 read_flags
, write_flags
);
2920 static int coroutine_fn
raw_co_copy_range_to(BlockDriverState
*bs
,
2922 uint64_t src_offset
,
2924 uint64_t dst_offset
,
2926 BdrvRequestFlags read_flags
,
2927 BdrvRequestFlags write_flags
)
2929 RawPosixAIOData acb
;
2930 BDRVRawState
*s
= bs
->opaque
;
2931 BDRVRawState
*src_s
;
2933 assert(dst
->bs
== bs
);
2934 if (src
->bs
->drv
->bdrv_co_copy_range_to
!= raw_co_copy_range_to
) {
2938 src_s
= src
->bs
->opaque
;
2939 if (fd_open(src
->bs
) < 0 || fd_open(dst
->bs
) < 0) {
2943 acb
= (RawPosixAIOData
) {
2945 .aio_type
= QEMU_AIO_COPY_RANGE
,
2946 .aio_fildes
= src_s
->fd
,
2947 .aio_offset
= src_offset
,
2948 .aio_nbytes
= bytes
,
2951 .aio_offset2
= dst_offset
,
2955 return raw_thread_pool_submit(bs
, handle_aiocb_copy_range
, &acb
);
2958 BlockDriver bdrv_file
= {
2959 .format_name
= "file",
2960 .protocol_name
= "file",
2961 .instance_size
= sizeof(BDRVRawState
),
2962 .bdrv_needs_filename
= true,
2963 .bdrv_probe
= NULL
, /* no probe for protocols */
2964 .bdrv_parse_filename
= raw_parse_filename
,
2965 .bdrv_file_open
= raw_open
,
2966 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2967 .bdrv_reopen_commit
= raw_reopen_commit
,
2968 .bdrv_reopen_abort
= raw_reopen_abort
,
2969 .bdrv_close
= raw_close
,
2970 .bdrv_co_create
= raw_co_create
,
2971 .bdrv_co_create_opts
= raw_co_create_opts
,
2972 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
2973 .bdrv_has_zero_init_truncate
= bdrv_has_zero_init_1
,
2974 .bdrv_co_block_status
= raw_co_block_status
,
2975 .bdrv_co_invalidate_cache
= raw_co_invalidate_cache
,
2976 .bdrv_co_pwrite_zeroes
= raw_co_pwrite_zeroes
,
2978 .bdrv_co_preadv
= raw_co_preadv
,
2979 .bdrv_co_pwritev
= raw_co_pwritev
,
2980 .bdrv_co_flush_to_disk
= raw_co_flush_to_disk
,
2981 .bdrv_co_pdiscard
= raw_co_pdiscard
,
2982 .bdrv_co_copy_range_from
= raw_co_copy_range_from
,
2983 .bdrv_co_copy_range_to
= raw_co_copy_range_to
,
2984 .bdrv_refresh_limits
= raw_refresh_limits
,
2985 .bdrv_io_plug
= raw_aio_plug
,
2986 .bdrv_io_unplug
= raw_aio_unplug
,
2987 .bdrv_attach_aio_context
= raw_aio_attach_aio_context
,
2989 .bdrv_co_truncate
= raw_co_truncate
,
2990 .bdrv_getlength
= raw_getlength
,
2991 .bdrv_get_info
= raw_get_info
,
2992 .bdrv_get_allocated_file_size
2993 = raw_get_allocated_file_size
,
2994 .bdrv_get_specific_stats
= raw_get_specific_stats
,
2995 .bdrv_check_perm
= raw_check_perm
,
2996 .bdrv_set_perm
= raw_set_perm
,
2997 .bdrv_abort_perm_update
= raw_abort_perm_update
,
2998 .create_opts
= &raw_create_opts
,
2999 .mutable_opts
= mutable_opts
,
3002 /***********************************************/
3005 #if defined(__APPLE__) && defined(__MACH__)
3006 static kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
3007 CFIndex maxPathSize
, int flags
);
3008 static char *FindEjectableOpticalMedia(io_iterator_t
*mediaIterator
)
3010 kern_return_t kernResult
= KERN_FAILURE
;
3011 mach_port_t masterPort
;
3012 CFMutableDictionaryRef classesToMatch
;
3013 const char *matching_array
[] = {kIODVDMediaClass
, kIOCDMediaClass
};
3014 char *mediaType
= NULL
;
3016 kernResult
= IOMasterPort( MACH_PORT_NULL
, &masterPort
);
3017 if ( KERN_SUCCESS
!= kernResult
) {
3018 printf( "IOMasterPort returned %d\n", kernResult
);
3022 for (index
= 0; index
< ARRAY_SIZE(matching_array
); index
++) {
3023 classesToMatch
= IOServiceMatching(matching_array
[index
]);
3024 if (classesToMatch
== NULL
) {
3025 error_report("IOServiceMatching returned NULL for %s",
3026 matching_array
[index
]);
3029 CFDictionarySetValue(classesToMatch
, CFSTR(kIOMediaEjectableKey
),
3031 kernResult
= IOServiceGetMatchingServices(masterPort
, classesToMatch
,
3033 if (kernResult
!= KERN_SUCCESS
) {
3034 error_report("Note: IOServiceGetMatchingServices returned %d",
3039 /* If a match was found, leave the loop */
3040 if (*mediaIterator
!= 0) {
3041 trace_file_FindEjectableOpticalMedia(matching_array
[index
]);
3042 mediaType
= g_strdup(matching_array
[index
]);
3049 kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
3050 CFIndex maxPathSize
, int flags
)
3052 io_object_t nextMedia
;
3053 kern_return_t kernResult
= KERN_FAILURE
;
3055 nextMedia
= IOIteratorNext( mediaIterator
);
3058 CFTypeRef bsdPathAsCFString
;
3059 bsdPathAsCFString
= IORegistryEntryCreateCFProperty( nextMedia
, CFSTR( kIOBSDNameKey
), kCFAllocatorDefault
, 0 );
3060 if ( bsdPathAsCFString
) {
3061 size_t devPathLength
;
3062 strcpy( bsdPath
, _PATH_DEV
);
3063 if (flags
& BDRV_O_NOCACHE
) {
3064 strcat(bsdPath
, "r");
3066 devPathLength
= strlen( bsdPath
);
3067 if ( CFStringGetCString( bsdPathAsCFString
, bsdPath
+ devPathLength
, maxPathSize
- devPathLength
, kCFStringEncodingASCII
) ) {
3068 kernResult
= KERN_SUCCESS
;
3070 CFRelease( bsdPathAsCFString
);
3072 IOObjectRelease( nextMedia
);
3078 /* Sets up a real cdrom for use in QEMU */
3079 static bool setup_cdrom(char *bsd_path
, Error
**errp
)
3081 int index
, num_of_test_partitions
= 2, fd
;
3082 char test_partition
[MAXPATHLEN
];
3083 bool partition_found
= false;
3085 /* look for a working partition */
3086 for (index
= 0; index
< num_of_test_partitions
; index
++) {
3087 snprintf(test_partition
, sizeof(test_partition
), "%ss%d", bsd_path
,
3089 fd
= qemu_open(test_partition
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
3091 partition_found
= true;
3097 /* if a working partition on the device was not found */
3098 if (partition_found
== false) {
3099 error_setg(errp
, "Failed to find a working partition on disc");
3101 trace_file_setup_cdrom(test_partition
);
3102 pstrcpy(bsd_path
, MAXPATHLEN
, test_partition
);
3104 return partition_found
;
3107 /* Prints directions on mounting and unmounting a device */
3108 static void print_unmounting_directions(const char *file_name
)
3110 error_report("If device %s is mounted on the desktop, unmount"
3111 " it first before using it in QEMU", file_name
);
3112 error_report("Command to unmount device: diskutil unmountDisk %s",
3114 error_report("Command to mount device: diskutil mountDisk %s", file_name
);
3117 #endif /* defined(__APPLE__) && defined(__MACH__) */
3119 static int hdev_probe_device(const char *filename
)
3123 /* allow a dedicated CD-ROM driver to match with a higher priority */
3124 if (strstart(filename
, "/dev/cdrom", NULL
))
3127 if (stat(filename
, &st
) >= 0 &&
3128 (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
))) {
3135 static int check_hdev_writable(BDRVRawState
*s
)
3137 #if defined(BLKROGET)
3138 /* Linux block devices can be configured "read-only" using blockdev(8).
3139 * This is independent of device node permissions and therefore open(2)
3140 * with O_RDWR succeeds. Actual writes fail with EPERM.
3142 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
3143 * check for read-only block devices so that Linux block devices behave
3149 if (fstat(s
->fd
, &st
)) {
3153 if (!S_ISBLK(st
.st_mode
)) {
3157 if (ioctl(s
->fd
, BLKROGET
, &readonly
) < 0) {
3164 #endif /* defined(BLKROGET) */
3168 static void hdev_parse_filename(const char *filename
, QDict
*options
,
3171 bdrv_parse_filename_strip_prefix(filename
, "host_device:", options
);
3174 static bool hdev_is_sg(BlockDriverState
*bs
)
3177 #if defined(__linux__)
3179 BDRVRawState
*s
= bs
->opaque
;
3181 struct sg_scsi_id scsiid
;
3185 if (stat(bs
->filename
, &st
) < 0 || !S_ISCHR(st
.st_mode
)) {
3189 ret
= ioctl(s
->fd
, SG_GET_VERSION_NUM
, &sg_version
);
3194 ret
= ioctl(s
->fd
, SG_GET_SCSI_ID
, &scsiid
);
3196 trace_file_hdev_is_sg(scsiid
.scsi_type
, sg_version
);
3205 static int hdev_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
3208 BDRVRawState
*s
= bs
->opaque
;
3209 Error
*local_err
= NULL
;
3212 #if defined(__APPLE__) && defined(__MACH__)
3214 * Caution: while qdict_get_str() is fine, getting non-string types
3215 * would require more care. When @options come from -blockdev or
3216 * blockdev_add, its members are typed according to the QAPI
3217 * schema, but when they come from -drive, they're all QString.
3219 const char *filename
= qdict_get_str(options
, "filename");
3220 char bsd_path
[MAXPATHLEN
] = "";
3221 bool error_occurred
= false;
3223 /* If using a real cdrom */
3224 if (strcmp(filename
, "/dev/cdrom") == 0) {
3225 char *mediaType
= NULL
;
3226 kern_return_t ret_val
;
3227 io_iterator_t mediaIterator
= 0;
3229 mediaType
= FindEjectableOpticalMedia(&mediaIterator
);
3230 if (mediaType
== NULL
) {
3231 error_setg(errp
, "Please make sure your CD/DVD is in the optical"
3233 error_occurred
= true;
3234 goto hdev_open_Mac_error
;
3237 ret_val
= GetBSDPath(mediaIterator
, bsd_path
, sizeof(bsd_path
), flags
);
3238 if (ret_val
!= KERN_SUCCESS
) {
3239 error_setg(errp
, "Could not get BSD path for optical drive");
3240 error_occurred
= true;
3241 goto hdev_open_Mac_error
;
3244 /* If a real optical drive was not found */
3245 if (bsd_path
[0] == '\0') {
3246 error_setg(errp
, "Failed to obtain bsd path for optical drive");
3247 error_occurred
= true;
3248 goto hdev_open_Mac_error
;
3251 /* If using a cdrom disc and finding a partition on the disc failed */
3252 if (strncmp(mediaType
, kIOCDMediaClass
, 9) == 0 &&
3253 setup_cdrom(bsd_path
, errp
) == false) {
3254 print_unmounting_directions(bsd_path
);
3255 error_occurred
= true;
3256 goto hdev_open_Mac_error
;
3259 qdict_put_str(options
, "filename", bsd_path
);
3261 hdev_open_Mac_error
:
3263 if (mediaIterator
) {
3264 IOObjectRelease(mediaIterator
);
3266 if (error_occurred
) {
3270 #endif /* defined(__APPLE__) && defined(__MACH__) */
3272 s
->type
= FTYPE_FILE
;
3274 ret
= raw_open_common(bs
, options
, flags
, 0, true, &local_err
);
3276 error_propagate(errp
, local_err
);
3277 #if defined(__APPLE__) && defined(__MACH__)
3279 filename
= bsd_path
;
3281 /* if a physical device experienced an error while being opened */
3282 if (strncmp(filename
, "/dev/", 5) == 0) {
3283 print_unmounting_directions(filename
);
3285 #endif /* defined(__APPLE__) && defined(__MACH__) */
3289 /* Since this does ioctl the device must be already opened */
3290 bs
->sg
= hdev_is_sg(bs
);
3292 if (flags
& BDRV_O_RDWR
) {
3293 ret
= check_hdev_writable(s
);
3296 error_setg_errno(errp
, -ret
, "The device is not writable");
3304 #if defined(__linux__)
3305 static int coroutine_fn
3306 hdev_co_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
3308 BDRVRawState
*s
= bs
->opaque
;
3309 RawPosixAIOData acb
;
3317 if (req
== SG_IO
&& s
->pr_mgr
) {
3318 struct sg_io_hdr
*io_hdr
= buf
;
3319 if (io_hdr
->cmdp
[0] == PERSISTENT_RESERVE_OUT
||
3320 io_hdr
->cmdp
[0] == PERSISTENT_RESERVE_IN
) {
3321 return pr_manager_execute(s
->pr_mgr
, bdrv_get_aio_context(bs
),
3326 acb
= (RawPosixAIOData
) {
3328 .aio_type
= QEMU_AIO_IOCTL
,
3329 .aio_fildes
= s
->fd
,
3337 return raw_thread_pool_submit(bs
, handle_aiocb_ioctl
, &acb
);
3341 static int fd_open(BlockDriverState
*bs
)
3343 BDRVRawState
*s
= bs
->opaque
;
3345 /* this is just to ensure s->fd is sane (its called by io ops) */
3351 static coroutine_fn
int
3352 hdev_co_pdiscard(BlockDriverState
*bs
, int64_t offset
, int bytes
)
3354 BDRVRawState
*s
= bs
->opaque
;
3359 raw_account_discard(s
, bytes
, ret
);
3362 return raw_do_pdiscard(bs
, offset
, bytes
, true);
3365 static coroutine_fn
int hdev_co_pwrite_zeroes(BlockDriverState
*bs
,
3366 int64_t offset
, int bytes
, BdrvRequestFlags flags
)
3375 return raw_do_pwrite_zeroes(bs
, offset
, bytes
, flags
, true);
3378 static int coroutine_fn
hdev_co_create_opts(const char *filename
, QemuOpts
*opts
,
3383 struct stat stat_buf
;
3384 int64_t total_size
= 0;
3387 /* This function is used by both protocol block drivers and therefore either
3388 * of these prefixes may be given.
3389 * The return value has to be stored somewhere, otherwise this is an error
3390 * due to -Werror=unused-value. */
3392 strstart(filename
, "host_device:", &filename
) ||
3393 strstart(filename
, "host_cdrom:" , &filename
);
3397 ret
= raw_normalize_devicepath(&filename
, errp
);
3402 /* Read out options */
3403 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
3406 fd
= qemu_open(filename
, O_WRONLY
| O_BINARY
);
3409 error_setg_errno(errp
, -ret
, "Could not open device");
3413 if (fstat(fd
, &stat_buf
) < 0) {
3415 error_setg_errno(errp
, -ret
, "Could not stat device");
3416 } else if (!S_ISBLK(stat_buf
.st_mode
) && !S_ISCHR(stat_buf
.st_mode
)) {
3418 "The given file is neither a block nor a character device");
3420 } else if (lseek(fd
, 0, SEEK_END
) < total_size
) {
3421 error_setg(errp
, "Device is too small");
3425 if (!ret
&& total_size
) {
3426 uint8_t buf
[BDRV_SECTOR_SIZE
] = { 0 };
3427 int64_t zero_size
= MIN(BDRV_SECTOR_SIZE
, total_size
);
3428 if (lseek(fd
, 0, SEEK_SET
) == -1) {
3431 ret
= qemu_write_full(fd
, buf
, zero_size
);
3432 ret
= ret
== zero_size
? 0 : -errno
;
3439 static BlockDriver bdrv_host_device
= {
3440 .format_name
= "host_device",
3441 .protocol_name
= "host_device",
3442 .instance_size
= sizeof(BDRVRawState
),
3443 .bdrv_needs_filename
= true,
3444 .bdrv_probe_device
= hdev_probe_device
,
3445 .bdrv_parse_filename
= hdev_parse_filename
,
3446 .bdrv_file_open
= hdev_open
,
3447 .bdrv_close
= raw_close
,
3448 .bdrv_reopen_prepare
= raw_reopen_prepare
,
3449 .bdrv_reopen_commit
= raw_reopen_commit
,
3450 .bdrv_reopen_abort
= raw_reopen_abort
,
3451 .bdrv_co_create_opts
= hdev_co_create_opts
,
3452 .create_opts
= &raw_create_opts
,
3453 .mutable_opts
= mutable_opts
,
3454 .bdrv_co_invalidate_cache
= raw_co_invalidate_cache
,
3455 .bdrv_co_pwrite_zeroes
= hdev_co_pwrite_zeroes
,
3457 .bdrv_co_preadv
= raw_co_preadv
,
3458 .bdrv_co_pwritev
= raw_co_pwritev
,
3459 .bdrv_co_flush_to_disk
= raw_co_flush_to_disk
,
3460 .bdrv_co_pdiscard
= hdev_co_pdiscard
,
3461 .bdrv_co_copy_range_from
= raw_co_copy_range_from
,
3462 .bdrv_co_copy_range_to
= raw_co_copy_range_to
,
3463 .bdrv_refresh_limits
= raw_refresh_limits
,
3464 .bdrv_io_plug
= raw_aio_plug
,
3465 .bdrv_io_unplug
= raw_aio_unplug
,
3466 .bdrv_attach_aio_context
= raw_aio_attach_aio_context
,
3468 .bdrv_co_truncate
= raw_co_truncate
,
3469 .bdrv_getlength
= raw_getlength
,
3470 .bdrv_get_info
= raw_get_info
,
3471 .bdrv_get_allocated_file_size
3472 = raw_get_allocated_file_size
,
3473 .bdrv_get_specific_stats
= hdev_get_specific_stats
,
3474 .bdrv_check_perm
= raw_check_perm
,
3475 .bdrv_set_perm
= raw_set_perm
,
3476 .bdrv_abort_perm_update
= raw_abort_perm_update
,
3477 .bdrv_probe_blocksizes
= hdev_probe_blocksizes
,
3478 .bdrv_probe_geometry
= hdev_probe_geometry
,
3480 /* generic scsi device */
3482 .bdrv_co_ioctl
= hdev_co_ioctl
,
3486 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
3487 static void cdrom_parse_filename(const char *filename
, QDict
*options
,
3490 bdrv_parse_filename_strip_prefix(filename
, "host_cdrom:", options
);
3495 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
3498 BDRVRawState
*s
= bs
->opaque
;
3502 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
3503 return raw_open_common(bs
, options
, flags
, O_NONBLOCK
, true, errp
);
3506 static int cdrom_probe_device(const char *filename
)
3512 fd
= qemu_open(filename
, O_RDONLY
| O_NONBLOCK
);
3516 ret
= fstat(fd
, &st
);
3517 if (ret
== -1 || !S_ISBLK(st
.st_mode
)) {
3521 /* Attempt to detect via a CDROM specific ioctl */
3522 ret
= ioctl(fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
3532 static bool cdrom_is_inserted(BlockDriverState
*bs
)
3534 BDRVRawState
*s
= bs
->opaque
;
3537 ret
= ioctl(s
->fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
3538 return ret
== CDS_DISC_OK
;
3541 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
3543 BDRVRawState
*s
= bs
->opaque
;
3546 if (ioctl(s
->fd
, CDROMEJECT
, NULL
) < 0)
3547 perror("CDROMEJECT");
3549 if (ioctl(s
->fd
, CDROMCLOSETRAY
, NULL
) < 0)
3550 perror("CDROMEJECT");
3554 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
3556 BDRVRawState
*s
= bs
->opaque
;
3558 if (ioctl(s
->fd
, CDROM_LOCKDOOR
, locked
) < 0) {
3560 * Note: an error can happen if the distribution automatically
3563 /* perror("CDROM_LOCKDOOR"); */
3567 static BlockDriver bdrv_host_cdrom
= {
3568 .format_name
= "host_cdrom",
3569 .protocol_name
= "host_cdrom",
3570 .instance_size
= sizeof(BDRVRawState
),
3571 .bdrv_needs_filename
= true,
3572 .bdrv_probe_device
= cdrom_probe_device
,
3573 .bdrv_parse_filename
= cdrom_parse_filename
,
3574 .bdrv_file_open
= cdrom_open
,
3575 .bdrv_close
= raw_close
,
3576 .bdrv_reopen_prepare
= raw_reopen_prepare
,
3577 .bdrv_reopen_commit
= raw_reopen_commit
,
3578 .bdrv_reopen_abort
= raw_reopen_abort
,
3579 .bdrv_co_create_opts
= hdev_co_create_opts
,
3580 .create_opts
= &raw_create_opts
,
3581 .mutable_opts
= mutable_opts
,
3582 .bdrv_co_invalidate_cache
= raw_co_invalidate_cache
,
3585 .bdrv_co_preadv
= raw_co_preadv
,
3586 .bdrv_co_pwritev
= raw_co_pwritev
,
3587 .bdrv_co_flush_to_disk
= raw_co_flush_to_disk
,
3588 .bdrv_refresh_limits
= raw_refresh_limits
,
3589 .bdrv_io_plug
= raw_aio_plug
,
3590 .bdrv_io_unplug
= raw_aio_unplug
,
3591 .bdrv_attach_aio_context
= raw_aio_attach_aio_context
,
3593 .bdrv_co_truncate
= raw_co_truncate
,
3594 .bdrv_getlength
= raw_getlength
,
3595 .has_variable_length
= true,
3596 .bdrv_get_allocated_file_size
3597 = raw_get_allocated_file_size
,
3599 /* removable device support */
3600 .bdrv_is_inserted
= cdrom_is_inserted
,
3601 .bdrv_eject
= cdrom_eject
,
3602 .bdrv_lock_medium
= cdrom_lock_medium
,
3604 /* generic scsi device */
3605 .bdrv_co_ioctl
= hdev_co_ioctl
,
3607 #endif /* __linux__ */
3609 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
3610 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
3613 BDRVRawState
*s
= bs
->opaque
;
3614 Error
*local_err
= NULL
;
3619 ret
= raw_open_common(bs
, options
, flags
, 0, true, &local_err
);
3621 error_propagate(errp
, local_err
);
3625 /* make sure the door isn't locked at this time */
3626 ioctl(s
->fd
, CDIOCALLOW
);
3630 static int cdrom_probe_device(const char *filename
)
3632 if (strstart(filename
, "/dev/cd", NULL
) ||
3633 strstart(filename
, "/dev/acd", NULL
))
3638 static int cdrom_reopen(BlockDriverState
*bs
)
3640 BDRVRawState
*s
= bs
->opaque
;
3644 * Force reread of possibly changed/newly loaded disc,
3645 * FreeBSD seems to not notice sometimes...
3649 fd
= qemu_open(bs
->filename
, s
->open_flags
, 0644);
3656 /* make sure the door isn't locked at this time */
3657 ioctl(s
->fd
, CDIOCALLOW
);
3661 static bool cdrom_is_inserted(BlockDriverState
*bs
)
3663 return raw_getlength(bs
) > 0;
3666 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
3668 BDRVRawState
*s
= bs
->opaque
;
3673 (void) ioctl(s
->fd
, CDIOCALLOW
);
3676 if (ioctl(s
->fd
, CDIOCEJECT
) < 0)
3677 perror("CDIOCEJECT");
3679 if (ioctl(s
->fd
, CDIOCCLOSE
) < 0)
3680 perror("CDIOCCLOSE");
3686 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
3688 BDRVRawState
*s
= bs
->opaque
;
3692 if (ioctl(s
->fd
, (locked
? CDIOCPREVENT
: CDIOCALLOW
)) < 0) {
3694 * Note: an error can happen if the distribution automatically
3697 /* perror("CDROM_LOCKDOOR"); */
3701 static BlockDriver bdrv_host_cdrom
= {
3702 .format_name
= "host_cdrom",
3703 .protocol_name
= "host_cdrom",
3704 .instance_size
= sizeof(BDRVRawState
),
3705 .bdrv_needs_filename
= true,
3706 .bdrv_probe_device
= cdrom_probe_device
,
3707 .bdrv_parse_filename
= cdrom_parse_filename
,
3708 .bdrv_file_open
= cdrom_open
,
3709 .bdrv_close
= raw_close
,
3710 .bdrv_reopen_prepare
= raw_reopen_prepare
,
3711 .bdrv_reopen_commit
= raw_reopen_commit
,
3712 .bdrv_reopen_abort
= raw_reopen_abort
,
3713 .bdrv_co_create_opts
= hdev_co_create_opts
,
3714 .create_opts
= &raw_create_opts
,
3715 .mutable_opts
= mutable_opts
,
3717 .bdrv_co_preadv
= raw_co_preadv
,
3718 .bdrv_co_pwritev
= raw_co_pwritev
,
3719 .bdrv_co_flush_to_disk
= raw_co_flush_to_disk
,
3720 .bdrv_refresh_limits
= raw_refresh_limits
,
3721 .bdrv_io_plug
= raw_aio_plug
,
3722 .bdrv_io_unplug
= raw_aio_unplug
,
3723 .bdrv_attach_aio_context
= raw_aio_attach_aio_context
,
3725 .bdrv_co_truncate
= raw_co_truncate
,
3726 .bdrv_getlength
= raw_getlength
,
3727 .has_variable_length
= true,
3728 .bdrv_get_allocated_file_size
3729 = raw_get_allocated_file_size
,
3731 /* removable device support */
3732 .bdrv_is_inserted
= cdrom_is_inserted
,
3733 .bdrv_eject
= cdrom_eject
,
3734 .bdrv_lock_medium
= cdrom_lock_medium
,
3736 #endif /* __FreeBSD__ */
3738 static void bdrv_file_init(void)
3741 * Register all the drivers. Note that order is important, the driver
3742 * registered last will get probed first.
3744 bdrv_register(&bdrv_file
);
3745 bdrv_register(&bdrv_host_device
);
3747 bdrv_register(&bdrv_host_cdrom
);
3749 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
3750 bdrv_register(&bdrv_host_cdrom
);
3754 block_init(bdrv_file_init
);