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Merge commit 'block/master' into staging

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* commit 'block/master':
  raw-posix: cleanup ioctl methods
  block: add bdrv_probe_device method
  raw-posix: split hdev drivers
  raw-posix: add a raw_open_common helper
  raw-posix: always store open flags
  fix qemu_aio_flush

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2009-06-15 12:52:49 -05:00
parent f5de141b34 63ec93db21
commit e510e05b5d
6 changed files with 420 additions and 344 deletions
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8
aio.c
View file

@ -103,11 +103,15 @@ void qemu_aio_flush(void)
do {
ret = 0;
/*
* If there are pending emulated aio start them now so flush
* will be able to return 1.
*/
qemu_aio_wait();
LIST_FOREACH(node, &aio_handlers, node) {
ret |= node->io_flush(node->opaque);
}
qemu_aio_wait();
} while (ret > 0);
}

48
block.c
View file

@ -209,7 +209,7 @@ static int is_windows_drive_prefix(const char *filename)
filename[1] == ':');
}
static int is_windows_drive(const char *filename)
int is_windows_drive(const char *filename)
{
if (is_windows_drive_prefix(filename) &&
filename[2] == '\0')
@ -249,8 +249,28 @@ static BlockDriver *find_protocol(const char *filename)
return NULL;
}
/* XXX: force raw format if block or character device ? It would
simplify the BSD case */
/*
* Detect host devices. By convention, /dev/cdrom[N] is always
* recognized as a host CDROM.
*/
static BlockDriver *find_hdev_driver(const char *filename)
{
int score_max = 0, score;
BlockDriver *drv = NULL, *d;
for (d = first_drv; d; d = d->next) {
if (d->bdrv_probe_device) {
score = d->bdrv_probe_device(filename);
if (score > score_max) {
score_max = score;
drv = d;
}
}
}
return drv;
}
static BlockDriver *find_image_format(const char *filename)
{
int ret, score, score_max;
@ -258,23 +278,6 @@ static BlockDriver *find_image_format(const char *filename)
uint8_t buf[2048];
BlockDriverState *bs;
/* detect host devices. By convention, /dev/cdrom[N] is always
recognized as a host CDROM */
if (strstart(filename, "/dev/cdrom", NULL))
return bdrv_find_format("host_device");
#ifdef _WIN32
if (is_windows_drive(filename))
return bdrv_find_format("host_device");
#else
{
struct stat st;
if (stat(filename, &st) >= 0 &&
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
return bdrv_find_format("host_device");
}
}
#endif
drv = find_protocol(filename);
/* no need to test disk image formats for vvfat */
if (drv && strcmp(drv->format_name, "vvfat") == 0)
@ -394,7 +397,10 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
if (flags & BDRV_O_FILE) {
drv = find_protocol(filename);
} else if (!drv) {
drv = find_image_format(filename);
drv = find_hdev_driver(filename);
if (!drv) {
drv = find_image_format(filename);
}
}
if (!drv) {
ret = -ENOENT;

686
block/raw-posix.c
View file

@ -103,16 +103,13 @@ typedef struct BDRVRawState {
int fd;
int type;
unsigned int lseek_err_cnt;
int open_flags;
#if defined(__linux__)
/* linux floppy specific */
int fd_open_flags;
int64_t fd_open_time;
int64_t fd_error_time;
int fd_got_error;
int fd_media_changed;
#endif
#if defined(__FreeBSD__)
int cd_open_flags;
#endif
uint8_t* aligned_buf;
} BDRVRawState;
@ -122,40 +119,36 @@ static int posix_aio_init(void);
static int fd_open(BlockDriverState *bs);
#if defined(__FreeBSD__)
static int cd_open(BlockDriverState *bs);
static int cdrom_reopen(BlockDriverState *bs);
#endif
static int raw_is_inserted(BlockDriverState *bs);
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
static int raw_open_common(BlockDriverState *bs, const char *filename,
int flags)
{
BDRVRawState *s = bs->opaque;
int fd, open_flags, ret;
int fd, ret;
posix_aio_init();
s->lseek_err_cnt = 0;
open_flags = O_BINARY;
s->open_flags |= O_BINARY;
if ((flags & BDRV_O_ACCESS) == O_RDWR) {
open_flags |= O_RDWR;
s->open_flags |= O_RDWR;
} else {
open_flags |= O_RDONLY;
s->open_flags |= O_RDONLY;
bs->read_only = 1;
}
if (flags & BDRV_O_CREAT)
open_flags |= O_CREAT | O_TRUNC;
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
if ((flags & BDRV_O_NOCACHE))
open_flags |= O_DIRECT;
s->open_flags |= O_DIRECT;
else if (!(flags & BDRV_O_CACHE_WB))
open_flags |= O_DSYNC;
s->open_flags |= O_DSYNC;
s->type = FTYPE_FILE;
fd = open(filename, open_flags, 0644);
s->fd = -1;
fd = open(filename, s->open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)
@ -175,6 +168,17 @@ static int raw_open(BlockDriverState *bs, const char *filename, int flags)
return 0;
}
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
s->type = FTYPE_FILE;
if (flags & BDRV_O_CREAT)
s->open_flags |= O_CREAT | O_TRUNC;
return raw_open_common(bs, filename, flags);
}
/* XXX: use host sector size if necessary with:
#ifdef DIOCGSECTORSIZE
{
@ -802,7 +806,7 @@ again:
if (size == 2048LL * (unsigned)-1)
size = 0;
/* XXX no disc? maybe we need to reopen... */
if (size <= 0 && !reopened && cd_open(bs) >= 0) {
if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
reopened = 1;
goto again;
}
@ -949,12 +953,25 @@ kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex ma
#endif
static int hdev_probe_device(const char *filename)
{
struct stat st;
/* allow a dedicated CD-ROM driver to match with a higher priority */
if (strstart(filename, "/dev/cdrom", NULL))
return 50;
if (stat(filename, &st) >= 0 &&
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
return 100;
}
return 0;
}
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int fd, open_flags, ret;
posix_aio_init();
#ifdef CONFIG_COCOA
if (strstart(filename, "/dev/cdrom", NULL)) {
@ -982,67 +999,15 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
IOObjectRelease( mediaIterator );
}
#endif
open_flags = O_BINARY;
if ((flags & BDRV_O_ACCESS) == O_RDWR) {
open_flags |= O_RDWR;
} else {
open_flags |= O_RDONLY;
bs->read_only = 1;
}
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
if ((flags & BDRV_O_NOCACHE))
open_flags |= O_DIRECT;
else if (!(flags & BDRV_O_CACHE_WB))
open_flags |= O_DSYNC;
s->type = FTYPE_FILE;
#if defined(__linux__)
if (strstart(filename, "/dev/cd", NULL)) {
/* open will not fail even if no CD is inserted */
open_flags |= O_NONBLOCK;
s->type = FTYPE_CD;
} else if (strstart(filename, "/dev/fd", NULL)) {
s->type = FTYPE_FD;
s->fd_open_flags = open_flags;
/* open will not fail even if no floppy is inserted */
open_flags |= O_NONBLOCK;
#ifdef CONFIG_AIO
} else if (strstart(filename, "/dev/sg", NULL)) {
#if defined(__linux__) && defined(CONFIG_AIO)
if (strstart(filename, "/dev/sg", NULL)) {
bs->sg = 1;
#endif
}
#endif
#if defined(__FreeBSD__)
if (strstart(filename, "/dev/cd", NULL) ||
strstart(filename, "/dev/acd", NULL)) {
s->type = FTYPE_CD;
s->cd_open_flags = open_flags;
}
#endif
s->fd = -1;
fd = open(filename, open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)
ret = -EACCES;
return ret;
}
s->fd = fd;
#if defined(__FreeBSD__)
/* make sure the door isnt locked at this time */
if (s->type == FTYPE_CD)
ioctl (s->fd, CDIOCALLOW);
#endif
#if defined(__linux__)
/* close fd so that we can reopen it as needed */
if (s->type == FTYPE_FD) {
close(s->fd);
s->fd = -1;
s->fd_media_changed = 1;
}
#endif
return 0;
return raw_open_common(bs, filename, flags);
}
#if defined(__linux__)
@ -1073,7 +1038,7 @@ static int fd_open(BlockDriverState *bs)
#endif
return -EIO;
}
s->fd = open(bs->filename, s->fd_open_flags);
s->fd = open(bs->filename, s->open_flags & ~O_NONBLOCK);
if (s->fd < 0) {
s->fd_error_time = qemu_get_clock(rt_clock);
s->fd_got_error = 1;
@ -1095,106 +1060,7 @@ static int fd_open(BlockDriverState *bs)
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
switch(s->type) {
case FTYPE_CD:
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret == CDS_DISC_OK)
return 1;
else
return 0;
break;
case FTYPE_FD:
ret = fd_open(bs);
return (ret >= 0);
default:
return 1;
}
}
/* currently only used by fdc.c, but a CD version would be good too */
static int raw_media_changed(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_FD:
{
int ret;
/* XXX: we do not have a true media changed indication. It
does not work if the floppy is changed without trying
to read it */
fd_open(bs);
ret = s->fd_media_changed;
s->fd_media_changed = 0;
#ifdef DEBUG_FLOPPY
printf("Floppy changed=%d\n", ret);
#endif
return ret;
}
default:
return -ENOTSUP;
}
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (eject_flag) {
if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
perror("CDROMEJECT");
} else {
if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
perror("CDROMEJECT");
}
break;
case FTYPE_FD:
{
int fd;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
}
fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FDEJECT, 0) < 0)
perror("FDEJECT");
close(fd);
}
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
/* Note: an error can happen if the distribution automatically
mounts the CD-ROM */
// perror("CDROM_LOCKDOOR");
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
BDRVRawState *s = bs->opaque;
@ -1202,7 +1068,7 @@ static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
}
#ifdef CONFIG_AIO
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
@ -1235,7 +1101,6 @@ static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
#endif
#elif defined(__FreeBSD__)
static int fd_open(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
@ -1245,104 +1110,6 @@ static int fd_open(BlockDriverState *bs)
return 0;
return -EIO;
}
static int cd_open(BlockDriverState *bs)
{
#if defined(__FreeBSD__)
BDRVRawState *s = bs->opaque;
int fd;
switch(s->type) {
case FTYPE_CD:
/* XXX force reread of possibly changed/newly loaded disc,
* FreeBSD seems to not notice sometimes... */
if (s->fd >= 0)
close (s->fd);
fd = open(bs->filename, s->cd_open_flags, 0644);
if (fd < 0) {
s->fd = -1;
return -EIO;
}
s->fd = fd;
/* make sure the door isnt locked at this time */
ioctl (s->fd, CDIOCALLOW);
}
#endif
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
return (raw_getlength(bs) > 0);
case FTYPE_FD:
/* XXX handle this */
/* FALLTHRU */
default:
return 1;
}
}
static int raw_media_changed(BlockDriverState *bs)
{
return -ENOTSUP;
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (s->fd < 0)
return -ENOTSUP;
(void) ioctl (s->fd, CDIOCALLOW);
if (eject_flag) {
if (ioctl (s->fd, CDIOCEJECT) < 0)
perror("CDIOCEJECT");
} else {
if (ioctl (s->fd, CDIOCCLOSE) < 0)
perror("CDIOCCLOSE");
}
if (cd_open(bs) < 0)
return -ENOTSUP;
break;
case FTYPE_FD:
/* XXX handle this */
/* FALLTHRU */
default:
return -ENOTSUP;
}
return 0;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (s->fd < 0)
return -ENOTSUP;
if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
/* Note: an error can happen if the distribution automatically
mounts the CD-ROM */
// perror("CDROM_LOCKDOOR");
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
return -ENOTSUP;
}
#else /* !linux && !FreeBSD */
static int fd_open(BlockDriverState *bs)
@ -1350,37 +1117,6 @@ static int fd_open(BlockDriverState *bs)
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
return 1;
}
static int raw_media_changed(BlockDriverState *bs)
{
return -ENOTSUP;
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
return -ENOTSUP;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
return -ENOTSUP;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
return -ENOTSUP;
}
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
return NULL;
}
#endif /* !linux && !FreeBSD */
static int hdev_create(const char *filename, QEMUOptionParameter *options)
@ -1416,6 +1152,7 @@ static int hdev_create(const char *filename, QEMUOptionParameter *options)
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = hdev_probe_device,
.bdrv_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
@ -1430,22 +1167,335 @@ static BlockDriver bdrv_host_device = {
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = raw_is_inserted,
.bdrv_media_changed = raw_media_changed,
.bdrv_eject = raw_eject,
.bdrv_set_locked = raw_set_locked,
/* generic scsi device */
.bdrv_ioctl = raw_ioctl,
#ifdef __linux__
.bdrv_ioctl = hdev_ioctl,
#ifdef CONFIG_AIO
.bdrv_aio_ioctl = raw_aio_ioctl,
.bdrv_aio_ioctl = hdev_aio_ioctl,
#endif
#endif
};
#ifdef __linux__
static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int ret;
posix_aio_init();
s->type = FTYPE_FD;
/* open will not fail even if no floppy is inserted */
s->open_flags |= O_NONBLOCK;
ret = raw_open_common(bs, filename, flags);
if (ret)
return ret;
/* close fd so that we can reopen it as needed */
close(s->fd);
s->fd = -1;
s->fd_media_changed = 1;
return 0;
}
static int floppy_probe_device(const char *filename)
{
if (strstart(filename, "/dev/fd", NULL))
return 100;
return 0;
}
static int floppy_is_inserted(BlockDriverState *bs)
{
return fd_open(bs) >= 0;
}
static int floppy_media_changed(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
/*
* XXX: we do not have a true media changed indication.
* It does not work if the floppy is changed without trying to read it.
*/
fd_open(bs);
ret = s->fd_media_changed;
s->fd_media_changed = 0;
#ifdef DEBUG_FLOPPY
printf("Floppy changed=%d\n", ret);
#endif
return ret;
}
static int floppy_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
int fd;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
}
fd = open(bs->filename, s->open_flags | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FDEJECT, 0) < 0)
perror("FDEJECT");
close(fd);
}
return 0;
}
static BlockDriver bdrv_host_floppy = {
.format_name = "host_floppy",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = floppy_probe_device,
.bdrv_open = floppy_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.bdrv_flush = raw_flush,
#ifdef CONFIG_AIO
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
#endif
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = floppy_is_inserted,
.bdrv_media_changed = floppy_media_changed,
.bdrv_eject = floppy_eject,
};
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
/* open will not fail even if no CD is inserted */
s->open_flags |= O_NONBLOCK;
s->type = FTYPE_CD;
return raw_open_common(bs, filename, flags);
}
static int cdrom_probe_device(const char *filename)
{
if (strstart(filename, "/dev/cd", NULL))
return 100;
return 0;
}
static int cdrom_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret == CDS_DISC_OK)
return 1;
return 0;
}
static int cdrom_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
if (eject_flag) {
if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
perror("CDROMEJECT");
} else {
if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
perror("CDROMEJECT");
}
return 0;
}
static int cdrom_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
/*
* Note: an error can happen if the distribution automatically
* mounts the CD-ROM
*/
/* perror("CDROM_LOCKDOOR"); */
}
return 0;
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.bdrv_flush = raw_flush,
#ifdef CONFIG_AIO
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
#endif
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_set_locked = cdrom_set_locked,
/* generic scsi device */
.bdrv_ioctl = hdev_ioctl,
#ifdef CONFIG_AIO
.bdrv_aio_ioctl = hdev_aio_ioctl,
#endif
};
#endif /* __linux__ */
#ifdef __FreeBSD__
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int ret;
s->type = FTYPE_CD;
ret = raw_open_common(bs, filename, flags);
if (ret)
return ret;
/* make sure the door isnt locked at this time */
ioctl(s->fd, CDIOCALLOW);
return 0;
}
static int cdrom_probe_device(const char *filename)
{
if (strstart(filename, "/dev/cd", NULL) ||
strstart(filename, "/dev/acd", NULL))
return 100;
return 0;
}
static int cdrom_reopen(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd;
/*
* Force reread of possibly changed/newly loaded disc,
* FreeBSD seems to not notice sometimes...
*/
if (s->fd >= 0)
close(s->fd);
fd = open(bs->filename, s->open_flags, 0644);
if (fd < 0) {
s->fd = -1;
return -EIO;
}
s->fd = fd;
/* make sure the door isnt locked at this time */
ioctl(s->fd, CDIOCALLOW);
return 0;
}
static int cdrom_is_inserted(BlockDriverState *bs)
{
return raw_getlength(bs) > 0;
}
static int cdrom_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return -ENOTSUP;
(void) ioctl(s->fd, CDIOCALLOW);
if (eject_flag) {
if (ioctl(s->fd, CDIOCEJECT) < 0)
perror("CDIOCEJECT");
} else {
if (ioctl(s->fd, CDIOCCLOSE) < 0)
perror("CDIOCCLOSE");
}
if (cdrom_reopen(bs) < 0)
return -ENOTSUP;
return 0;
}
static int cdrom_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
if (s->fd < 0)
return -ENOTSUP;
if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
/*
* Note: an error can happen if the distribution automatically
* mounts the CD-ROM
*/
/* perror("CDROM_LOCKDOOR"); */
}
return 0;
}
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.bdrv_flush = raw_flush,
#ifdef CONFIG_AIO
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
#endif
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = cdrom_is_inserted,
.bdrv_eject = cdrom_eject,
.bdrv_set_locked = cdrom_set_locked,
};
#endif /* __FreeBSD__ */
static void bdrv_raw_init(void)
{
/*
* Register all the drivers. Note that order is important, the driver
* registered last will get probed first.
*/
bdrv_register(&bdrv_raw);
bdrv_register(&bdrv_host_device);
#ifdef __linux__
bdrv_register(&bdrv_host_floppy);
bdrv_register(&bdrv_host_cdrom);
#endif
#ifdef __FreeBSD__
bdrv_register(&bdrv_host_cdrom);
#endif
}
block_init(bdrv_raw_init);

10
block/raw-win32.c
View file

@ -306,6 +306,15 @@ static int find_device_type(BlockDriverState *bs, const char *filename)
}
}
static int hdev_probe_device(const char *filename)
{
if (strstart(filename, "/dev/cdrom", NULL))
return 100;
if (is_windows_drive(filename))
return 100;
return 0;
}
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
@ -391,6 +400,7 @@ static int raw_set_locked(BlockDriverState *bs, int locked)
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = hdev_probe_device,
.bdrv_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_flush = raw_flush,

5
block_int.h
View file

@ -48,6 +48,7 @@ struct BlockDriver {
const char *format_name;
int instance_size;
int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
int (*bdrv_probe_device)(const char *filename);
int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors);
@ -177,4 +178,8 @@ void *qemu_blockalign(BlockDriverState *bs, size_t size);
extern BlockDriverState *bdrv_first;
#ifdef _WIN32
int is_windows_drive(const char *filename);
#endif
#endif /* BLOCK_INT_H */

7
qemu-aio.h
View file

@ -24,9 +24,10 @@ typedef int (AioFlushHandler)(void *opaque);
* outstanding AIO operations have been completed or cancelled. */
void qemu_aio_flush(void);
/* Wait for a single AIO completion to occur. This function will until a
* single AIO opeartion has completed. It is intended to be used as a looping
* primative when simulating synchronous IO based on asynchronous IO. */
/* Wait for a single AIO completion to occur. This function will wait
* until a single AIO event has completed and it will ensure something
* has moved before returning. This can issue new pending aio as
* result of executing I/O completion or bh callbacks. */
void qemu_aio_wait(void);
/* Register a file descriptor and associated callbacks. Behaves very similarly