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block: Lift device model API into BlockBackend
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Move device model attachment / detachment and the BlockDevOps device
model callbacks and their wrappers from BlockDriverState to
BlockBackend.

Wrapper calls in block.c change from

    bdrv_dev_FOO_cb(bs, ...)

to

    if (bs->blk) {
        bdrv_dev_FOO_cb(bs->blk, ...);
    }

No change, because both bdrv_dev_change_media_cb() and
bdrv_dev_resize_cb() do nothing when no device model is attached, and
a device model can be attached only when bs->blk.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@kevmw
Markus Armbruster authored and kevmw committed Oct 20, 2014
1 parent 6007cdd commit a7f53e2
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Showing 7 changed files with 204 additions and 183 deletions.
126 changes: 13 additions & 113 deletions block.c
View file
Expand Up @@ -58,9 +58,6 @@ struct BdrvDirtyBitmap {

#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */

#define COROUTINE_POOL_RESERVATION 64 /* number of coroutines to reserve */

static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load);
static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockCompletionFunc *cb, void *opaque);
Expand Down Expand Up @@ -1527,7 +1524,9 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
}

if (!bdrv_key_required(bs)) {
bdrv_dev_change_media_cb(bs, true);
if (bs->blk) {
blk_dev_change_media_cb(bs->blk, true);
}
} else if (!runstate_check(RUN_STATE_PRELAUNCH)
&& !runstate_check(RUN_STATE_INMIGRATE)
&& !runstate_check(RUN_STATE_PAUSED)) { /* HACK */
Expand Down Expand Up @@ -1852,7 +1851,9 @@ void bdrv_close(BlockDriverState *bs)
}
}

bdrv_dev_change_media_cb(bs, false);
if (bs->blk) {
blk_dev_change_media_cb(bs->blk, false);
}

/*throttling disk I/O limits*/
if (bs->io_limits_enabled) {
Expand Down Expand Up @@ -1971,9 +1972,6 @@ static void bdrv_move_feature_fields(BlockDriverState *bs_dest,
/* move some fields that need to stay attached to the device */

/* dev info */
bs_dest->dev_ops = bs_src->dev_ops;
bs_dest->dev_opaque = bs_src->dev_opaque;
bs_dest->dev = bs_src->dev;
bs_dest->guest_block_size = bs_src->guest_block_size;
bs_dest->copy_on_read = bs_src->copy_on_read;

Expand Down Expand Up @@ -2043,7 +2041,6 @@ void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old)
assert(!bs_new->blk);
assert(QLIST_EMPTY(&bs_new->dirty_bitmaps));
assert(bs_new->job == NULL);
assert(bs_new->dev == NULL);
assert(bs_new->io_limits_enabled == false);
assert(!throttle_have_timer(&bs_new->throttle_state));

Expand All @@ -2060,7 +2057,6 @@ void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old)
assert(!bs_new->blk);

/* Check a few fields that should remain attached to the device */
assert(bs_new->dev == NULL);
assert(bs_new->job == NULL);
assert(bs_new->io_limits_enabled == false);
assert(!throttle_have_timer(&bs_new->throttle_state));
Expand Down Expand Up @@ -2099,7 +2095,6 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)

static void bdrv_delete(BlockDriverState *bs)
{
assert(!bs->dev);
assert(!bs->job);
assert(bdrv_op_blocker_is_empty(bs));
assert(!bs->refcnt);
Expand All @@ -2113,105 +2108,6 @@ static void bdrv_delete(BlockDriverState *bs)
g_free(bs);
}

int bdrv_attach_dev(BlockDriverState *bs, void *dev)
/* TODO change to DeviceState *dev when all users are qdevified */
{
if (bs->dev) {
return -EBUSY;
}
bs->dev = dev;
bdrv_iostatus_reset(bs);

/* We're expecting I/O from the device so bump up coroutine pool size */
qemu_coroutine_adjust_pool_size(COROUTINE_POOL_RESERVATION);
return 0;
}

/* TODO qdevified devices don't use this, remove when devices are qdevified */
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev)
{
if (bdrv_attach_dev(bs, dev) < 0) {
abort();
}
}

void bdrv_detach_dev(BlockDriverState *bs, void *dev)
/* TODO change to DeviceState *dev when all users are qdevified */
{
assert(bs->dev == dev);
bs->dev = NULL;
bs->dev_ops = NULL;
bs->dev_opaque = NULL;
bs->guest_block_size = 512;
qemu_coroutine_adjust_pool_size(-COROUTINE_POOL_RESERVATION);
}

/* TODO change to return DeviceState * when all users are qdevified */
void *bdrv_get_attached_dev(BlockDriverState *bs)
{
return bs->dev;
}

void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
void *opaque)
{
bs->dev_ops = ops;
bs->dev_opaque = opaque;
}

static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load)
{
if (bs->dev_ops && bs->dev_ops->change_media_cb) {
bool tray_was_closed = !bdrv_dev_is_tray_open(bs);
bs->dev_ops->change_media_cb(bs->dev_opaque, load);
if (tray_was_closed) {
/* tray open */
qapi_event_send_device_tray_moved(bdrv_get_device_name(bs),
true, &error_abort);
}
if (load) {
/* tray close */
qapi_event_send_device_tray_moved(bdrv_get_device_name(bs),
false, &error_abort);
}
}
}

bool bdrv_dev_has_removable_media(BlockDriverState *bs)
{
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb);
}

void bdrv_dev_eject_request(BlockDriverState *bs, bool force)
{
if (bs->dev_ops && bs->dev_ops->eject_request_cb) {
bs->dev_ops->eject_request_cb(bs->dev_opaque, force);
}
}

bool bdrv_dev_is_tray_open(BlockDriverState *bs)
{
if (bs->dev_ops && bs->dev_ops->is_tray_open) {
return bs->dev_ops->is_tray_open(bs->dev_opaque);
}
return false;
}

static void bdrv_dev_resize_cb(BlockDriverState *bs)
{
if (bs->dev_ops && bs->dev_ops->resize_cb) {
bs->dev_ops->resize_cb(bs->dev_opaque);
}
}

bool bdrv_dev_is_medium_locked(BlockDriverState *bs)
{
if (bs->dev_ops && bs->dev_ops->is_medium_locked) {
return bs->dev_ops->is_medium_locked(bs->dev_opaque);
}
return false;
}

/*
* Run consistency checks on an image
*
Expand Down Expand Up @@ -3545,7 +3441,9 @@ int bdrv_truncate(BlockDriverState *bs, int64_t offset)
ret = drv->bdrv_truncate(bs, offset);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dev_resize_cb(bs);
if (bs->blk) {
blk_dev_resize_cb(bs->blk);
}
}
return ret;
}
Expand Down Expand Up @@ -3746,8 +3644,10 @@ int bdrv_set_key(BlockDriverState *bs, const char *key)
bs->valid_key = 0;
} else if (!bs->valid_key) {
bs->valid_key = 1;
/* call the change callback now, we skipped it on open */
bdrv_dev_change_media_cb(bs, true);
if (bs->blk) {
/* call the change callback now, we skipped it on open */
blk_dev_change_media_cb(bs->blk, true);
}
}
return ret;
}
Expand Down
151 changes: 140 additions & 11 deletions block/block-backend.c
View file
Expand Up @@ -13,13 +13,22 @@
#include "sysemu/block-backend.h"
#include "block/block_int.h"
#include "sysemu/blockdev.h"
#include "qapi-event.h"

/* Number of coroutines to reserve per attached device model */
#define COROUTINE_POOL_RESERVATION 64

struct BlockBackend {
char *name;
int refcnt;
BlockDriverState *bs;
DriveInfo *legacy_dinfo; /* null unless created by drive_new() */
QTAILQ_ENTRY(BlockBackend) link; /* for blk_backends */

void *dev; /* attached device model, if any */
/* TODO change to DeviceState when all users are qdevified */
const BlockDevOps *dev_ops;
void *dev_opaque;
};

static void drive_info_del(DriveInfo *dinfo);
Expand Down Expand Up @@ -85,6 +94,7 @@ BlockBackend *blk_new_with_bs(const char *name, Error **errp)
static void blk_delete(BlockBackend *blk)
{
assert(!blk->refcnt);
assert(!blk->dev);
if (blk->bs) {
assert(blk->bs->blk == blk);
blk->bs->blk = NULL;
Expand Down Expand Up @@ -237,34 +247,153 @@ void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk)
}
}

void blk_iostatus_enable(BlockBackend *blk)
{
bdrv_iostatus_enable(blk->bs);
}

/*
* Attach device model @dev to @blk.
* Return 0 on success, -EBUSY when a device model is attached already.
*/
int blk_attach_dev(BlockBackend *blk, void *dev)
/* TODO change to DeviceState *dev when all users are qdevified */
{
return bdrv_attach_dev(blk->bs, dev);
if (blk->dev) {
return -EBUSY;
}
blk->dev = dev;
bdrv_iostatus_reset(blk->bs);

/* We're expecting I/O from the device so bump up coroutine pool size */
qemu_coroutine_adjust_pool_size(COROUTINE_POOL_RESERVATION);
return 0;
}

/*
* Attach device model @dev to @blk.
* @blk must not have a device model attached already.
* TODO qdevified devices don't use this, remove when devices are qdevified
*/
void blk_attach_dev_nofail(BlockBackend *blk, void *dev)
{
bdrv_attach_dev_nofail(blk->bs, dev);
if (blk_attach_dev(blk, dev) < 0) {
abort();
}
}

/*
* Detach device model @dev from @blk.
* @dev must be currently attached to @blk.
*/
void blk_detach_dev(BlockBackend *blk, void *dev)
/* TODO change to DeviceState *dev when all users are qdevified */
{
bdrv_detach_dev(blk->bs, dev);
assert(blk->dev == dev);
blk->dev = NULL;
blk->dev_ops = NULL;
blk->dev_opaque = NULL;
bdrv_set_guest_block_size(blk->bs, 512);
qemu_coroutine_adjust_pool_size(-COROUTINE_POOL_RESERVATION);
}

/*
* Return the device model attached to @blk if any, else null.
*/
void *blk_get_attached_dev(BlockBackend *blk)
/* TODO change to return DeviceState * when all users are qdevified */
{
return blk->dev;
}

/*
* Set @blk's device model callbacks to @ops.
* @opaque is the opaque argument to pass to the callbacks.
* This is for use by device models.
*/
void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
void *opaque)
{
return bdrv_get_attached_dev(blk->bs);
blk->dev_ops = ops;
blk->dev_opaque = opaque;
}

void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque)
/*
* Notify @blk's attached device model of media change.
* If @load is true, notify of media load.
* Else, notify of media eject.
* Also send DEVICE_TRAY_MOVED events as appropriate.
*/
void blk_dev_change_media_cb(BlockBackend *blk, bool load)
{
bdrv_set_dev_ops(blk->bs, ops, opaque);
if (blk->dev_ops && blk->dev_ops->change_media_cb) {
bool tray_was_closed = !blk_dev_is_tray_open(blk);

blk->dev_ops->change_media_cb(blk->dev_opaque, load);
if (tray_was_closed) {
/* tray open */
qapi_event_send_device_tray_moved(blk_name(blk),
true, &error_abort);
}
if (load) {
/* tray close */
qapi_event_send_device_tray_moved(blk_name(blk),
false, &error_abort);
}
}
}

/*
* Does @blk's attached device model have removable media?
* %true if no device model is attached.
*/
bool blk_dev_has_removable_media(BlockBackend *blk)
{
return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb);
}

/*
* Notify @blk's attached device model of a media eject request.
* If @force is true, the medium is about to be yanked out forcefully.
*/
void blk_dev_eject_request(BlockBackend *blk, bool force)
{
if (blk->dev_ops && blk->dev_ops->eject_request_cb) {
blk->dev_ops->eject_request_cb(blk->dev_opaque, force);
}
}

/*
* Does @blk's attached device model have a tray, and is it open?
*/
bool blk_dev_is_tray_open(BlockBackend *blk)
{
if (blk->dev_ops && blk->dev_ops->is_tray_open) {
return blk->dev_ops->is_tray_open(blk->dev_opaque);
}
return false;
}

/*
* Does @blk's attached device model have the medium locked?
* %false if the device model has no such lock.
*/
bool blk_dev_is_medium_locked(BlockBackend *blk)
{
if (blk->dev_ops && blk->dev_ops->is_medium_locked) {
return blk->dev_ops->is_medium_locked(blk->dev_opaque);
}
return false;
}

/*
* Notify @blk's attached device model of a backend size change.
*/
void blk_dev_resize_cb(BlockBackend *blk)
{
if (blk->dev_ops && blk->dev_ops->resize_cb) {
blk->dev_ops->resize_cb(blk->dev_opaque);
}
}

void blk_iostatus_enable(BlockBackend *blk)
{
bdrv_iostatus_enable(blk->bs);
}

int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
Expand Down

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