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blockdev: Split off basic bitmap operations for qemu-img
Upcoming patches want to add some basic bitmap manipulation abilities to qemu-img. But blockdev.o is too heavyweight to link into qemu-img (among other things, it would drag in block jobs and transaction support - qemu-img does offline manipulation, where atomicity is less important because there are no concurrent modifications to compete with), so it's time to split off the bare bones of what we will need into a new file block/monitor/bitmap-qmp-cmds.o. This is sufficient to expose 6 QMP commands for use by qemu-img (add, remove, clear, enable, disable, merge), as well as move the three helper functions touched in the previous patch. Regarding MAINTAINERS, the new file is automatically part of block core, but also makes sense as related to other dirty bitmap files. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513011648.166876-6-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
This commit is contained in:
Eric Blake
parent
c6996cf9a6
commit
bb4e58c613
5 changed files with 324 additions and 286 deletions
284
blockdev.c
284
blockdev.c
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@ -1185,53 +1185,6 @@ out_aio_context:
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return NULL;
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}
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/**
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* block_dirty_bitmap_lookup:
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* Return a dirty bitmap (if present), after validating
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* the node reference and bitmap names.
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*
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* @node: The name of the BDS node to search for bitmaps
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* @name: The name of the bitmap to search for
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* @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
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* @errp: Output pointer for error information. Can be NULL.
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*
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* @return: A bitmap object on success, or NULL on failure.
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*/
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BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
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const char *name,
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BlockDriverState **pbs,
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Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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if (!node) {
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error_setg(errp, "Node cannot be NULL");
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return NULL;
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}
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if (!name) {
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error_setg(errp, "Bitmap name cannot be NULL");
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return NULL;
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}
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bs = bdrv_lookup_bs(node, node, NULL);
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if (!bs) {
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error_setg(errp, "Node '%s' not found", node);
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return NULL;
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}
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bitmap = bdrv_find_dirty_bitmap(bs, name);
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if (!bitmap) {
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error_setg(errp, "Dirty bitmap '%s' not found", name);
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return NULL;
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}
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if (pbs) {
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*pbs = bs;
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}
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return bitmap;
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}
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/* New and old BlockDriverState structs for atomic group operations */
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typedef struct BlkActionState BlkActionState;
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@ -2432,243 +2385,6 @@ void qmp_block_passwd(bool has_device, const char *device,
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"Setting block passwords directly is no longer supported");
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}
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void qmp_block_dirty_bitmap_add(const char *node, const char *name,
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bool has_granularity, uint32_t granularity,
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bool has_persistent, bool persistent,
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bool has_disabled, bool disabled,
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Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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AioContext *aio_context;
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if (!name || name[0] == '\0') {
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error_setg(errp, "Bitmap name cannot be empty");
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return;
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}
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bs = bdrv_lookup_bs(node, node, errp);
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if (!bs) {
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return;
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}
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aio_context = bdrv_get_aio_context(bs);
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aio_context_acquire(aio_context);
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if (has_granularity) {
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if (granularity < 512 || !is_power_of_2(granularity)) {
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error_setg(errp, "Granularity must be power of 2 "
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"and at least 512");
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goto out;
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}
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} else {
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/* Default to cluster size, if available: */
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granularity = bdrv_get_default_bitmap_granularity(bs);
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}
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if (!has_persistent) {
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persistent = false;
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}
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if (!has_disabled) {
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disabled = false;
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}
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if (persistent &&
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!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
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{
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goto out;
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}
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bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
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if (bitmap == NULL) {
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goto out;
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}
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if (disabled) {
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bdrv_disable_dirty_bitmap(bitmap);
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}
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bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
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out:
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aio_context_release(aio_context);
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}
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BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
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bool release,
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BlockDriverState **bitmap_bs,
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Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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AioContext *aio_context;
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bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
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if (!bitmap || !bs) {
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return NULL;
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}
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aio_context = bdrv_get_aio_context(bs);
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aio_context_acquire(aio_context);
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if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO,
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errp)) {
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aio_context_release(aio_context);
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return NULL;
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}
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if (bdrv_dirty_bitmap_get_persistence(bitmap) &&
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bdrv_remove_persistent_dirty_bitmap(bs, name, errp) < 0)
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{
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aio_context_release(aio_context);
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return NULL;
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}
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if (release) {
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bdrv_release_dirty_bitmap(bitmap);
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}
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if (bitmap_bs) {
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*bitmap_bs = bs;
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}
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aio_context_release(aio_context);
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return release ? NULL : bitmap;
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}
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void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
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Error **errp)
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{
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block_dirty_bitmap_remove(node, name, true, NULL, errp);
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}
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/**
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* Completely clear a bitmap, for the purposes of synchronizing a bitmap
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* immediately after a full backup operation.
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*/
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void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
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Error **errp)
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{
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BdrvDirtyBitmap *bitmap;
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BlockDriverState *bs;
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bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
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if (!bitmap || !bs) {
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return;
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}
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if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) {
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return;
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}
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bdrv_clear_dirty_bitmap(bitmap, NULL);
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}
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void qmp_block_dirty_bitmap_enable(const char *node, const char *name,
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Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
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if (!bitmap) {
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return;
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}
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if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
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return;
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}
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bdrv_enable_dirty_bitmap(bitmap);
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}
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void qmp_block_dirty_bitmap_disable(const char *node, const char *name,
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Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
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if (!bitmap) {
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return;
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}
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if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
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return;
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}
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bdrv_disable_dirty_bitmap(bitmap);
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}
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BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target,
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BlockDirtyBitmapMergeSourceList *bms,
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HBitmap **backup, Error **errp)
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{
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BlockDriverState *bs;
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BdrvDirtyBitmap *dst, *src, *anon;
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BlockDirtyBitmapMergeSourceList *lst;
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Error *local_err = NULL;
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dst = block_dirty_bitmap_lookup(node, target, &bs, errp);
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if (!dst) {
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return NULL;
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}
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anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst),
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NULL, errp);
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if (!anon) {
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return NULL;
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}
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for (lst = bms; lst; lst = lst->next) {
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switch (lst->value->type) {
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const char *name, *node;
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case QTYPE_QSTRING:
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name = lst->value->u.local;
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src = bdrv_find_dirty_bitmap(bs, name);
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if (!src) {
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error_setg(errp, "Dirty bitmap '%s' not found", name);
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dst = NULL;
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goto out;
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}
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break;
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case QTYPE_QDICT:
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node = lst->value->u.external.node;
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name = lst->value->u.external.name;
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src = block_dirty_bitmap_lookup(node, name, NULL, errp);
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if (!src) {
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dst = NULL;
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goto out;
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}
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break;
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default:
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abort();
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}
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bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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dst = NULL;
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goto out;
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}
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}
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/* Merge into dst; dst is unchanged on failure. */
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bdrv_merge_dirty_bitmap(dst, anon, backup, errp);
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out:
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bdrv_release_dirty_bitmap(anon);
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return dst;
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}
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void qmp_block_dirty_bitmap_merge(const char *node, const char *target,
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BlockDirtyBitmapMergeSourceList *bitmaps,
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Error **errp)
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{
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block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp);
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}
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BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
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const char *name,
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Error **errp)
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