#include "sysemu/block-backend.h"
#include "block/block_int.h"
#include "block/blockjob.h"
+#include "block/throttle-groups.h"
#include "sysemu/blockdev.h"
#include "sysemu/sysemu.h"
#include "qapi-event.h"
/* the block size for which the guest device expects atomicity */
int guest_block_size;
+ /* If the BDS tree is removed, some of its options are stored here (which
+ * can be used to restore those options in the new BDS on insert) */
+ BlockBackendRootState root_state;
+
/* I/O stats (display with "info blockstats"). */
BlockAcctStats stats;
bdrv_unref(blk->bs);
blk->bs = NULL;
}
+ if (blk->root_state.throttle_state) {
+ g_free(blk->root_state.throttle_group);
+ throttle_group_unref(blk->root_state.throttle_state);
+ }
/* Avoid double-remove after blk_hide_on_behalf_of_hmp_drive_del() */
if (blk->name[0]) {
QTAILQ_REMOVE(&blk_backends, blk, link);
}
g_free(blk->name);
drive_info_del(blk->legacy_dinfo);
+ block_acct_cleanup(&blk->stats);
g_free(blk);
}
g_free(dinfo);
}
+int blk_get_refcnt(BlockBackend *blk)
+{
+ return blk ? blk->refcnt : 0;
+}
+
/*
* Increment @blk's reference count.
* @blk must not be null.
}
}
+/*
+ * Disassociates the currently associated BlockDriverState from @blk.
+ */
+void blk_remove_bs(BlockBackend *blk)
+{
+ blk_update_root_state(blk);
+
+ blk->bs->blk = NULL;
+ bdrv_unref(blk->bs);
+ blk->bs = NULL;
+}
+
+/*
+ * Associates a new BlockDriverState with @blk.
+ */
+void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
+{
+ assert(!blk->bs && !bs->blk);
+ bdrv_ref(bs);
+ blk->bs = bs;
+ bs->blk = blk;
+}
+
/*
* Attach device model @dev to @blk.
* Return 0 on success, -EBUSY when a device model is attached already.
void blk_dev_change_media_cb(BlockBackend *blk, bool load)
{
if (blk->dev_ops && blk->dev_ops->change_media_cb) {
- bool tray_was_closed = !blk_dev_is_tray_open(blk);
+ bool tray_was_open, tray_is_open;
+ tray_was_open = 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);
+ tray_is_open = blk_dev_is_tray_open(blk);
+
+ if (tray_was_open != tray_is_open) {
+ qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open,
+ &error_abort);
}
}
}
return -EIO;
}
- if (!blk_is_inserted(blk)) {
+ if (!blk_is_available(blk)) {
return -ENOMEDIUM;
}
qemu_aio_unref(acb);
}
-static BlockAIOCB *abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb,
- void *opaque, int ret)
+BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
+ BlockCompletionFunc *cb,
+ void *opaque, int ret)
{
struct BlockBackendAIOCB *acb;
QEMUBH *bh;
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
if (ret < 0) {
- return abort_aio_request(blk, cb, opaque, ret);
+ return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags,
int64_t blk_getlength(BlockBackend *blk)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_getlength(blk->bs);
}
void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
{
- bdrv_get_geometry(blk->bs, nb_sectors_ptr);
+ if (!blk->bs) {
+ *nb_sectors_ptr = 0;
+ } else {
+ bdrv_get_geometry(blk->bs, nb_sectors_ptr);
+ }
}
int64_t blk_nb_sectors(BlockBackend *blk)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_nb_sectors(blk->bs);
}
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
if (ret < 0) {
- return abort_aio_request(blk, cb, opaque, ret);
+ return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
if (ret < 0) {
- return abort_aio_request(blk, cb, opaque, ret);
+ return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
BlockAIOCB *blk_aio_flush(BlockBackend *blk,
BlockCompletionFunc *cb, void *opaque)
{
+ if (!blk_is_available(blk)) {
+ return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
+ }
+
return bdrv_aio_flush(blk->bs, cb, opaque);
}
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
if (ret < 0) {
- return abort_aio_request(blk, cb, opaque, ret);
+ return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque);
int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_ioctl(blk->bs, req, buf);
}
BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
BlockCompletionFunc *cb, void *opaque)
{
+ if (!blk_is_available(blk)) {
+ return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
+ }
+
return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque);
}
int blk_co_flush(BlockBackend *blk)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_co_flush(blk->bs);
}
int blk_flush(BlockBackend *blk)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_flush(blk->bs);
}
void blk_drain(BlockBackend *blk)
{
- bdrv_drain(blk->bs);
+ if (blk->bs) {
+ bdrv_drain(blk->bs);
+ }
}
void blk_drain_all(void)
int blk_is_read_only(BlockBackend *blk)
{
- return bdrv_is_read_only(blk->bs);
+ if (blk->bs) {
+ return bdrv_is_read_only(blk->bs);
+ } else {
+ return blk->root_state.read_only;
+ }
}
int blk_is_sg(BlockBackend *blk)
{
+ if (!blk->bs) {
+ return 0;
+ }
+
return bdrv_is_sg(blk->bs);
}
int blk_enable_write_cache(BlockBackend *blk)
{
- return bdrv_enable_write_cache(blk->bs);
+ if (blk->bs) {
+ return bdrv_enable_write_cache(blk->bs);
+ } else {
+ return !!(blk->root_state.open_flags & BDRV_O_CACHE_WB);
+ }
}
void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
{
- bdrv_set_enable_write_cache(blk->bs, wce);
+ if (blk->bs) {
+ bdrv_set_enable_write_cache(blk->bs, wce);
+ } else {
+ if (wce) {
+ blk->root_state.open_flags |= BDRV_O_CACHE_WB;
+ } else {
+ blk->root_state.open_flags &= ~BDRV_O_CACHE_WB;
+ }
+ }
}
void blk_invalidate_cache(BlockBackend *blk, Error **errp)
{
+ if (!blk->bs) {
+ error_setg(errp, "Device '%s' has no medium", blk->name);
+ return;
+ }
+
bdrv_invalidate_cache(blk->bs, errp);
}
void blk_lock_medium(BlockBackend *blk, bool locked)
{
- bdrv_lock_medium(blk->bs, locked);
+ if (blk->bs) {
+ bdrv_lock_medium(blk->bs, locked);
+ }
}
void blk_eject(BlockBackend *blk, bool eject_flag)
{
- bdrv_eject(blk->bs, eject_flag);
+ if (blk->bs) {
+ bdrv_eject(blk->bs, eject_flag);
+ }
}
int blk_get_flags(BlockBackend *blk)
{
- return bdrv_get_flags(blk->bs);
+ if (blk->bs) {
+ return bdrv_get_flags(blk->bs);
+ } else {
+ return blk->root_state.open_flags;
+ }
}
int blk_get_max_transfer_length(BlockBackend *blk)
{
- return blk->bs->bl.max_transfer_length;
+ if (blk->bs) {
+ return blk->bs->bl.max_transfer_length;
+ } else {
+ return 0;
+ }
}
void blk_set_guest_block_size(BlockBackend *blk, int align)
bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
{
+ if (!blk->bs) {
+ return false;
+ }
+
return bdrv_op_is_blocked(blk->bs, op, errp);
}
void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
{
- bdrv_op_unblock(blk->bs, op, reason);
+ if (blk->bs) {
+ bdrv_op_unblock(blk->bs, op, reason);
+ }
}
void blk_op_block_all(BlockBackend *blk, Error *reason)
{
- bdrv_op_block_all(blk->bs, reason);
+ if (blk->bs) {
+ bdrv_op_block_all(blk->bs, reason);
+ }
}
void blk_op_unblock_all(BlockBackend *blk, Error *reason)
{
- bdrv_op_unblock_all(blk->bs, reason);
+ if (blk->bs) {
+ bdrv_op_unblock_all(blk->bs, reason);
+ }
}
AioContext *blk_get_aio_context(BlockBackend *blk)
void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
{
- bdrv_set_aio_context(blk->bs, new_context);
+ if (blk->bs) {
+ bdrv_set_aio_context(blk->bs, new_context);
+ }
}
void blk_add_aio_context_notifier(BlockBackend *blk,
void (*attached_aio_context)(AioContext *new_context, void *opaque),
void (*detach_aio_context)(void *opaque), void *opaque)
{
- bdrv_add_aio_context_notifier(blk->bs, attached_aio_context,
- detach_aio_context, opaque);
+ if (blk->bs) {
+ bdrv_add_aio_context_notifier(blk->bs, attached_aio_context,
+ detach_aio_context, opaque);
+ }
}
void blk_remove_aio_context_notifier(BlockBackend *blk,
void (*detach_aio_context)(void *),
void *opaque)
{
- bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context,
- detach_aio_context, opaque);
+ if (blk->bs) {
+ bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context,
+ detach_aio_context, opaque);
+ }
}
void blk_add_close_notifier(BlockBackend *blk, Notifier *notify)
{
- bdrv_add_close_notifier(blk->bs, notify);
+ if (blk->bs) {
+ bdrv_add_close_notifier(blk->bs, notify);
+ }
}
void blk_io_plug(BlockBackend *blk)
{
- bdrv_io_plug(blk->bs);
+ if (blk->bs) {
+ bdrv_io_plug(blk->bs);
+ }
}
void blk_io_unplug(BlockBackend *blk)
{
- bdrv_io_unplug(blk->bs);
+ if (blk->bs) {
+ bdrv_io_unplug(blk->bs);
+ }
}
BlockAcctStats *blk_get_stats(BlockBackend *blk)
int blk_truncate(BlockBackend *blk, int64_t offset)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_truncate(blk->bs, offset);
}
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
int64_t pos, int size)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_save_vmstate(blk->bs, buf, pos, size);
}
int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_load_vmstate(blk->bs, buf, pos, size);
}
int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_probe_blocksizes(blk->bs, bsz);
}
int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
{
+ if (!blk_is_available(blk)) {
+ return -ENOMEDIUM;
+ }
+
return bdrv_probe_geometry(blk->bs, geo);
}
+
+/*
+ * Updates the BlockBackendRootState object with data from the currently
+ * attached BlockDriverState.
+ */
+void blk_update_root_state(BlockBackend *blk)
+{
+ assert(blk->bs);
+
+ blk->root_state.open_flags = blk->bs->open_flags;
+ blk->root_state.read_only = blk->bs->read_only;
+ blk->root_state.detect_zeroes = blk->bs->detect_zeroes;
+
+ if (blk->root_state.throttle_group) {
+ g_free(blk->root_state.throttle_group);
+ throttle_group_unref(blk->root_state.throttle_state);
+ }
+ if (blk->bs->throttle_state) {
+ const char *name = throttle_group_get_name(blk->bs);
+ blk->root_state.throttle_group = g_strdup(name);
+ blk->root_state.throttle_state = throttle_group_incref(name);
+ } else {
+ blk->root_state.throttle_group = NULL;
+ blk->root_state.throttle_state = NULL;
+ }
+}
+
+/*
+ * Applies the information in the root state to the given BlockDriverState. This
+ * does not include the flags which have to be specified for bdrv_open(), use
+ * blk_get_open_flags_from_root_state() to inquire them.
+ */
+void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs)
+{
+ bs->detect_zeroes = blk->root_state.detect_zeroes;
+ if (blk->root_state.throttle_group) {
+ bdrv_io_limits_enable(bs, blk->root_state.throttle_group);
+ }
+}
+
+/*
+ * Returns the flags to be used for bdrv_open() of a BlockDriverState which is
+ * supposed to inherit the root state.
+ */
+int blk_get_open_flags_from_root_state(BlockBackend *blk)
+{
+ int bs_flags;
+
+ bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR;
+ bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR;
+
+ return bs_flags;
+}
+
+BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
+{
+ return &blk->root_state;
+}
projects / qemu.git / blobdiff