810 lines
24 KiB
C
810 lines
24 KiB
C
/*
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* Block Dirty Bitmap
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*
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* Copyright (c) 2016-2017 Red Hat. Inc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "trace.h"
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#include "block/block_int.h"
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#include "block/blockjob.h"
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/**
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* A BdrvDirtyBitmap can be in three possible states:
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* (1) successor is NULL and disabled is false: full r/w mode
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* (2) successor is NULL and disabled is true: read only mode ("disabled")
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* (3) successor is set: frozen mode.
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* A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set,
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* or enabled. A frozen bitmap can only abdicate() or reclaim().
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*/
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struct BdrvDirtyBitmap {
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QemuMutex *mutex;
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HBitmap *bitmap; /* Dirty bitmap implementation */
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HBitmap *meta; /* Meta dirty bitmap */
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bool qmp_locked; /* Bitmap is locked, it can't be modified
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through QMP */
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BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */
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char *name; /* Optional non-empty unique ID */
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int64_t size; /* Size of the bitmap, in bytes */
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bool disabled; /* Bitmap is disabled. It ignores all writes to
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the device */
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int active_iterators; /* How many iterators are active */
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bool readonly; /* Bitmap is read-only. This field also
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prevents the respective image from being
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modified (i.e. blocks writes and discards).
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Such operations must fail and both the image
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and this bitmap must remain unchanged while
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this flag is set. */
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bool persistent; /* bitmap must be saved to owner disk image */
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QLIST_ENTRY(BdrvDirtyBitmap) list;
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};
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struct BdrvDirtyBitmapIter {
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HBitmapIter hbi;
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BdrvDirtyBitmap *bitmap;
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};
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static inline void bdrv_dirty_bitmaps_lock(BlockDriverState *bs)
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{
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qemu_mutex_lock(&bs->dirty_bitmap_mutex);
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}
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static inline void bdrv_dirty_bitmaps_unlock(BlockDriverState *bs)
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{
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qemu_mutex_unlock(&bs->dirty_bitmap_mutex);
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}
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void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap)
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{
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qemu_mutex_lock(bitmap->mutex);
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}
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void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap)
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{
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qemu_mutex_unlock(bitmap->mutex);
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}
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/* Called with BQL or dirty_bitmap lock taken. */
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BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name)
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{
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BdrvDirtyBitmap *bm;
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assert(name);
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QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
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if (bm->name && !strcmp(name, bm->name)) {
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return bm;
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}
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}
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return NULL;
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}
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/* Called with BQL taken. */
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BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
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uint32_t granularity,
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const char *name,
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Error **errp)
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{
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int64_t bitmap_size;
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BdrvDirtyBitmap *bitmap;
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assert(is_power_of_2(granularity) && granularity >= BDRV_SECTOR_SIZE);
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if (name && bdrv_find_dirty_bitmap(bs, name)) {
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error_setg(errp, "Bitmap already exists: %s", name);
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return NULL;
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}
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bitmap_size = bdrv_getlength(bs);
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if (bitmap_size < 0) {
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error_setg_errno(errp, -bitmap_size, "could not get length of device");
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errno = -bitmap_size;
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return NULL;
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}
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bitmap = g_new0(BdrvDirtyBitmap, 1);
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bitmap->mutex = &bs->dirty_bitmap_mutex;
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bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(granularity));
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bitmap->size = bitmap_size;
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bitmap->name = g_strdup(name);
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bitmap->disabled = false;
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bdrv_dirty_bitmaps_lock(bs);
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QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
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bdrv_dirty_bitmaps_unlock(bs);
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return bitmap;
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}
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/* bdrv_create_meta_dirty_bitmap
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*
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* Create a meta dirty bitmap that tracks the changes of bits in @bitmap. I.e.
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* when a dirty status bit in @bitmap is changed (either from reset to set or
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* the other way around), its respective meta dirty bitmap bit will be marked
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* dirty as well.
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*
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* @bitmap: the block dirty bitmap for which to create a meta dirty bitmap.
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* @chunk_size: how many bytes of bitmap data does each bit in the meta bitmap
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* track.
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*/
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void bdrv_create_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap,
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int chunk_size)
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{
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assert(!bitmap->meta);
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qemu_mutex_lock(bitmap->mutex);
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bitmap->meta = hbitmap_create_meta(bitmap->bitmap,
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chunk_size * BITS_PER_BYTE);
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qemu_mutex_unlock(bitmap->mutex);
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}
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void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap)
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{
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assert(bitmap->meta);
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qemu_mutex_lock(bitmap->mutex);
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hbitmap_free_meta(bitmap->bitmap);
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bitmap->meta = NULL;
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qemu_mutex_unlock(bitmap->mutex);
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}
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int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap)
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{
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return bitmap->size;
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}
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const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap)
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{
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return bitmap->name;
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}
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/* Called with BQL taken. */
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bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap)
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{
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return bitmap->successor;
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}
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void bdrv_dirty_bitmap_set_qmp_locked(BdrvDirtyBitmap *bitmap, bool qmp_locked)
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{
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qemu_mutex_lock(bitmap->mutex);
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bitmap->qmp_locked = qmp_locked;
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qemu_mutex_unlock(bitmap->mutex);
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}
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bool bdrv_dirty_bitmap_qmp_locked(BdrvDirtyBitmap *bitmap)
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{
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return bitmap->qmp_locked;
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}
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/* Called with BQL taken. */
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bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap)
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{
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return !(bitmap->disabled || bitmap->successor);
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}
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/* Called with BQL taken. */
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DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap)
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{
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if (bdrv_dirty_bitmap_frozen(bitmap)) {
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return DIRTY_BITMAP_STATUS_FROZEN;
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} else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
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return DIRTY_BITMAP_STATUS_LOCKED;
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} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
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return DIRTY_BITMAP_STATUS_DISABLED;
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} else {
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return DIRTY_BITMAP_STATUS_ACTIVE;
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}
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}
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/**
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* Create a successor bitmap destined to replace this bitmap after an operation.
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* Requires that the bitmap is not frozen and has no successor.
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* Called with BQL taken.
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*/
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int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs,
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BdrvDirtyBitmap *bitmap, Error **errp)
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{
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uint64_t granularity;
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BdrvDirtyBitmap *child;
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if (bdrv_dirty_bitmap_frozen(bitmap)) {
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error_setg(errp, "Cannot create a successor for a bitmap that is "
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"currently frozen");
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return -1;
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}
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assert(!bitmap->successor);
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/* Create an anonymous successor */
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granularity = bdrv_dirty_bitmap_granularity(bitmap);
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child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
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if (!child) {
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return -1;
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}
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/* Successor will be on or off based on our current state. */
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child->disabled = bitmap->disabled;
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/* Install the successor and freeze the parent */
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bitmap->successor = child;
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return 0;
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}
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void bdrv_enable_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap)
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{
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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bitmap->disabled = false;
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}
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/* Called with BQL taken. */
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void bdrv_dirty_bitmap_enable_successor(BdrvDirtyBitmap *bitmap)
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{
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assert(bitmap->mutex == bitmap->successor->mutex);
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qemu_mutex_lock(bitmap->mutex);
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bdrv_enable_dirty_bitmap_locked(bitmap->successor);
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qemu_mutex_unlock(bitmap->mutex);
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}
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/* Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken. */
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static void bdrv_release_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap)
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{
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assert(!bitmap->active_iterators);
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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assert(!bitmap->meta);
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QLIST_REMOVE(bitmap, list);
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hbitmap_free(bitmap->bitmap);
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g_free(bitmap->name);
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g_free(bitmap);
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}
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/**
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* For a bitmap with a successor, yield our name to the successor,
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* delete the old bitmap, and return a handle to the new bitmap.
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* Called with BQL taken.
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*/
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BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
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BdrvDirtyBitmap *bitmap,
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Error **errp)
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{
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char *name;
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BdrvDirtyBitmap *successor = bitmap->successor;
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if (successor == NULL) {
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error_setg(errp, "Cannot relinquish control if "
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"there's no successor present");
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return NULL;
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}
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name = bitmap->name;
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bitmap->name = NULL;
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successor->name = name;
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bitmap->successor = NULL;
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successor->persistent = bitmap->persistent;
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bitmap->persistent = false;
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bdrv_release_dirty_bitmap(bs, bitmap);
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return successor;
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}
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/**
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* In cases of failure where we can no longer safely delete the parent,
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* we may wish to re-join the parent and child/successor.
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* The merged parent will be un-frozen, but not explicitly re-enabled.
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* Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken.
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*/
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BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
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BdrvDirtyBitmap *parent,
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Error **errp)
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{
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BdrvDirtyBitmap *successor = parent->successor;
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if (!successor) {
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error_setg(errp, "Cannot reclaim a successor when none is present");
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return NULL;
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}
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if (!hbitmap_merge(parent->bitmap, successor->bitmap)) {
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error_setg(errp, "Merging of parent and successor bitmap failed");
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return NULL;
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}
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bdrv_release_dirty_bitmap_locked(successor);
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parent->successor = NULL;
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return parent;
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}
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/* Called with BQL taken. */
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BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
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BdrvDirtyBitmap *parent,
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Error **errp)
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{
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BdrvDirtyBitmap *ret;
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qemu_mutex_lock(parent->mutex);
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ret = bdrv_reclaim_dirty_bitmap_locked(bs, parent, errp);
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qemu_mutex_unlock(parent->mutex);
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return ret;
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}
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/**
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* Truncates _all_ bitmaps attached to a BDS.
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* Called with BQL taken.
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*/
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void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes)
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{
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BdrvDirtyBitmap *bitmap;
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bdrv_dirty_bitmaps_lock(bs);
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QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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assert(!bitmap->active_iterators);
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hbitmap_truncate(bitmap->bitmap, bytes);
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bitmap->size = bytes;
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}
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bdrv_dirty_bitmaps_unlock(bs);
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}
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/* Called with BQL taken. */
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void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
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{
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bdrv_dirty_bitmaps_lock(bs);
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bdrv_release_dirty_bitmap_locked(bitmap);
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bdrv_dirty_bitmaps_unlock(bs);
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}
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/**
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* Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()).
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* There must not be any frozen bitmaps attached.
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* This function does not remove persistent bitmaps from the storage.
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* Called with BQL taken.
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*/
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void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
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{
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BdrvDirtyBitmap *bm, *next;
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bdrv_dirty_bitmaps_lock(bs);
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QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
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if (bdrv_dirty_bitmap_name(bm)) {
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bdrv_release_dirty_bitmap_locked(bm);
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}
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}
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bdrv_dirty_bitmaps_unlock(bs);
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}
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/**
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* Release all persistent dirty bitmaps attached to a BDS (for use in
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* bdrv_inactivate_recurse()).
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* There must not be any frozen bitmaps attached.
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* This function does not remove persistent bitmaps from the storage.
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* Called with BQL taken.
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*/
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void bdrv_release_persistent_dirty_bitmaps(BlockDriverState *bs)
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{
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BdrvDirtyBitmap *bm, *next;
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bdrv_dirty_bitmaps_lock(bs);
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QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
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if (bdrv_dirty_bitmap_get_persistance(bm)) {
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bdrv_release_dirty_bitmap_locked(bm);
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}
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}
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bdrv_dirty_bitmaps_unlock(bs);
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}
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/**
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* Remove persistent dirty bitmap from the storage if it exists.
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* Absence of bitmap is not an error, because we have the following scenario:
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* BdrvDirtyBitmap can have .persistent = true but not yet saved and have no
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* stored version. For such bitmap bdrv_remove_persistent_dirty_bitmap() should
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* not fail.
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* This function doesn't release corresponding BdrvDirtyBitmap.
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*/
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void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
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const char *name,
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Error **errp)
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{
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if (bs->drv && bs->drv->bdrv_remove_persistent_dirty_bitmap) {
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bs->drv->bdrv_remove_persistent_dirty_bitmap(bs, name, errp);
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}
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}
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void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
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{
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bdrv_dirty_bitmap_lock(bitmap);
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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bitmap->disabled = true;
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bdrv_dirty_bitmap_unlock(bitmap);
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}
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void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
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{
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bdrv_dirty_bitmap_lock(bitmap);
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bdrv_enable_dirty_bitmap_locked(bitmap);
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bdrv_dirty_bitmap_unlock(bitmap);
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}
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BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
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{
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BdrvDirtyBitmap *bm;
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BlockDirtyInfoList *list = NULL;
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BlockDirtyInfoList **plist = &list;
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bdrv_dirty_bitmaps_lock(bs);
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QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
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BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1);
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BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1);
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info->count = bdrv_get_dirty_count(bm);
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info->granularity = bdrv_dirty_bitmap_granularity(bm);
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info->has_name = !!bm->name;
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info->name = g_strdup(bm->name);
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info->status = bdrv_dirty_bitmap_status(bm);
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entry->value = info;
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*plist = entry;
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plist = &entry->next;
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}
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bdrv_dirty_bitmaps_unlock(bs);
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return list;
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}
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/* Called within bdrv_dirty_bitmap_lock..unlock */
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bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
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int64_t offset)
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{
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if (bitmap) {
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return hbitmap_get(bitmap->bitmap, offset);
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} else {
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return false;
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}
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}
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/**
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* Chooses a default granularity based on the existing cluster size,
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* but clamped between [4K, 64K]. Defaults to 64K in the case that there
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* is no cluster size information available.
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*/
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uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs)
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{
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BlockDriverInfo bdi;
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uint32_t granularity;
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if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) {
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granularity = MAX(4096, bdi.cluster_size);
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granularity = MIN(65536, granularity);
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} else {
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granularity = 65536;
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}
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return granularity;
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}
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uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap)
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{
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return 1U << hbitmap_granularity(bitmap->bitmap);
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}
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BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap)
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{
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BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1);
|
|
hbitmap_iter_init(&iter->hbi, bitmap->bitmap, 0);
|
|
iter->bitmap = bitmap;
|
|
bitmap->active_iterators++;
|
|
return iter;
|
|
}
|
|
|
|
BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap)
|
|
{
|
|
BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1);
|
|
hbitmap_iter_init(&iter->hbi, bitmap->meta, 0);
|
|
iter->bitmap = bitmap;
|
|
bitmap->active_iterators++;
|
|
return iter;
|
|
}
|
|
|
|
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter)
|
|
{
|
|
if (!iter) {
|
|
return;
|
|
}
|
|
assert(iter->bitmap->active_iterators > 0);
|
|
iter->bitmap->active_iterators--;
|
|
g_free(iter);
|
|
}
|
|
|
|
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
|
|
{
|
|
return hbitmap_iter_next(&iter->hbi, true);
|
|
}
|
|
|
|
/**
|
|
* Return the next consecutively dirty area in the dirty bitmap
|
|
* belonging to the given iterator @iter.
|
|
*
|
|
* @max_offset: Maximum value that may be returned for
|
|
* *offset + *bytes
|
|
* @offset: Will contain the start offset of the next dirty area
|
|
* @bytes: Will contain the length of the next dirty area
|
|
*
|
|
* Returns: True if a dirty area could be found before max_offset
|
|
* (which means that *offset and *bytes then contain valid
|
|
* values), false otherwise.
|
|
*
|
|
* Note that @iter is never advanced if false is returned. If an area
|
|
* is found (which means that true is returned), it will be advanced
|
|
* past that area.
|
|
*/
|
|
bool bdrv_dirty_iter_next_area(BdrvDirtyBitmapIter *iter, uint64_t max_offset,
|
|
uint64_t *offset, int *bytes)
|
|
{
|
|
uint32_t granularity = bdrv_dirty_bitmap_granularity(iter->bitmap);
|
|
uint64_t gran_max_offset;
|
|
int64_t ret;
|
|
int size;
|
|
|
|
if (max_offset == iter->bitmap->size) {
|
|
/* If max_offset points to the image end, round it up by the
|
|
* bitmap granularity */
|
|
gran_max_offset = ROUND_UP(max_offset, granularity);
|
|
} else {
|
|
gran_max_offset = max_offset;
|
|
}
|
|
|
|
ret = hbitmap_iter_next(&iter->hbi, false);
|
|
if (ret < 0 || ret + granularity > gran_max_offset) {
|
|
return false;
|
|
}
|
|
|
|
*offset = ret;
|
|
size = 0;
|
|
|
|
assert(granularity <= INT_MAX);
|
|
|
|
do {
|
|
/* Advance iterator */
|
|
ret = hbitmap_iter_next(&iter->hbi, true);
|
|
size += granularity;
|
|
} while (ret + granularity <= gran_max_offset &&
|
|
hbitmap_iter_next(&iter->hbi, false) == ret + granularity &&
|
|
size <= INT_MAX - granularity);
|
|
|
|
*bytes = MIN(size, max_offset - *offset);
|
|
return true;
|
|
}
|
|
|
|
/* Called within bdrv_dirty_bitmap_lock..unlock */
|
|
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
|
|
int64_t offset, int64_t bytes)
|
|
{
|
|
assert(bdrv_dirty_bitmap_enabled(bitmap));
|
|
assert(!bdrv_dirty_bitmap_readonly(bitmap));
|
|
hbitmap_set(bitmap->bitmap, offset, bytes);
|
|
}
|
|
|
|
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
|
|
int64_t offset, int64_t bytes)
|
|
{
|
|
bdrv_dirty_bitmap_lock(bitmap);
|
|
bdrv_set_dirty_bitmap_locked(bitmap, offset, bytes);
|
|
bdrv_dirty_bitmap_unlock(bitmap);
|
|
}
|
|
|
|
/* Called within bdrv_dirty_bitmap_lock..unlock */
|
|
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
|
|
int64_t offset, int64_t bytes)
|
|
{
|
|
assert(bdrv_dirty_bitmap_enabled(bitmap));
|
|
assert(!bdrv_dirty_bitmap_readonly(bitmap));
|
|
hbitmap_reset(bitmap->bitmap, offset, bytes);
|
|
}
|
|
|
|
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
|
|
int64_t offset, int64_t bytes)
|
|
{
|
|
bdrv_dirty_bitmap_lock(bitmap);
|
|
bdrv_reset_dirty_bitmap_locked(bitmap, offset, bytes);
|
|
bdrv_dirty_bitmap_unlock(bitmap);
|
|
}
|
|
|
|
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out)
|
|
{
|
|
assert(bdrv_dirty_bitmap_enabled(bitmap));
|
|
assert(!bdrv_dirty_bitmap_readonly(bitmap));
|
|
bdrv_dirty_bitmap_lock(bitmap);
|
|
if (!out) {
|
|
hbitmap_reset_all(bitmap->bitmap);
|
|
} else {
|
|
HBitmap *backup = bitmap->bitmap;
|
|
bitmap->bitmap = hbitmap_alloc(bitmap->size,
|
|
hbitmap_granularity(backup));
|
|
*out = backup;
|
|
}
|
|
bdrv_dirty_bitmap_unlock(bitmap);
|
|
}
|
|
|
|
void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in)
|
|
{
|
|
HBitmap *tmp = bitmap->bitmap;
|
|
assert(bdrv_dirty_bitmap_enabled(bitmap));
|
|
assert(!bdrv_dirty_bitmap_readonly(bitmap));
|
|
bitmap->bitmap = in;
|
|
hbitmap_free(tmp);
|
|
}
|
|
|
|
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
|
|
uint64_t offset, uint64_t bytes)
|
|
{
|
|
return hbitmap_serialization_size(bitmap->bitmap, offset, bytes);
|
|
}
|
|
|
|
uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return hbitmap_serialization_align(bitmap->bitmap);
|
|
}
|
|
|
|
void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap,
|
|
uint8_t *buf, uint64_t offset,
|
|
uint64_t bytes)
|
|
{
|
|
hbitmap_serialize_part(bitmap->bitmap, buf, offset, bytes);
|
|
}
|
|
|
|
void bdrv_dirty_bitmap_deserialize_part(BdrvDirtyBitmap *bitmap,
|
|
uint8_t *buf, uint64_t offset,
|
|
uint64_t bytes, bool finish)
|
|
{
|
|
hbitmap_deserialize_part(bitmap->bitmap, buf, offset, bytes, finish);
|
|
}
|
|
|
|
void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
|
|
uint64_t offset, uint64_t bytes,
|
|
bool finish)
|
|
{
|
|
hbitmap_deserialize_zeroes(bitmap->bitmap, offset, bytes, finish);
|
|
}
|
|
|
|
void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap,
|
|
uint64_t offset, uint64_t bytes,
|
|
bool finish)
|
|
{
|
|
hbitmap_deserialize_ones(bitmap->bitmap, offset, bytes, finish);
|
|
}
|
|
|
|
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap)
|
|
{
|
|
hbitmap_deserialize_finish(bitmap->bitmap);
|
|
}
|
|
|
|
void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes)
|
|
{
|
|
BdrvDirtyBitmap *bitmap;
|
|
|
|
if (QLIST_EMPTY(&bs->dirty_bitmaps)) {
|
|
return;
|
|
}
|
|
|
|
bdrv_dirty_bitmaps_lock(bs);
|
|
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
|
|
if (!bdrv_dirty_bitmap_enabled(bitmap)) {
|
|
continue;
|
|
}
|
|
assert(!bdrv_dirty_bitmap_readonly(bitmap));
|
|
hbitmap_set(bitmap->bitmap, offset, bytes);
|
|
}
|
|
bdrv_dirty_bitmaps_unlock(bs);
|
|
}
|
|
|
|
/**
|
|
* Advance a BdrvDirtyBitmapIter to an arbitrary offset.
|
|
*/
|
|
void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t offset)
|
|
{
|
|
hbitmap_iter_init(&iter->hbi, iter->hbi.hb, offset);
|
|
}
|
|
|
|
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return hbitmap_count(bitmap->bitmap);
|
|
}
|
|
|
|
int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return hbitmap_count(bitmap->meta);
|
|
}
|
|
|
|
bool bdrv_dirty_bitmap_readonly(const BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return bitmap->readonly;
|
|
}
|
|
|
|
/* Called with BQL taken. */
|
|
void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value)
|
|
{
|
|
qemu_mutex_lock(bitmap->mutex);
|
|
bitmap->readonly = value;
|
|
qemu_mutex_unlock(bitmap->mutex);
|
|
}
|
|
|
|
bool bdrv_has_readonly_bitmaps(BlockDriverState *bs)
|
|
{
|
|
BdrvDirtyBitmap *bm;
|
|
QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
|
|
if (bm->readonly) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Called with BQL taken. */
|
|
void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap, bool persistent)
|
|
{
|
|
qemu_mutex_lock(bitmap->mutex);
|
|
bitmap->persistent = persistent;
|
|
qemu_mutex_unlock(bitmap->mutex);
|
|
}
|
|
|
|
bool bdrv_dirty_bitmap_get_persistance(BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return bitmap->persistent;
|
|
}
|
|
|
|
bool bdrv_has_changed_persistent_bitmaps(BlockDriverState *bs)
|
|
{
|
|
BdrvDirtyBitmap *bm;
|
|
QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
|
|
if (bm->persistent && !bm->readonly) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
BdrvDirtyBitmap *bdrv_dirty_bitmap_next(BlockDriverState *bs,
|
|
BdrvDirtyBitmap *bitmap)
|
|
{
|
|
return bitmap == NULL ? QLIST_FIRST(&bs->dirty_bitmaps) :
|
|
QLIST_NEXT(bitmap, list);
|
|
}
|
|
|
|
char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp)
|
|
{
|
|
return hbitmap_sha256(bitmap->bitmap, errp);
|
|
}
|
|
|
|
int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, uint64_t offset)
|
|
{
|
|
return hbitmap_next_zero(bitmap->bitmap, offset);
|
|
}
|
|
|
|
void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src,
|
|
Error **errp)
|
|
{
|
|
/* only bitmaps from one bds are supported */
|
|
assert(dest->mutex == src->mutex);
|
|
|
|
qemu_mutex_lock(dest->mutex);
|
|
|
|
assert(bdrv_dirty_bitmap_enabled(dest));
|
|
assert(!bdrv_dirty_bitmap_readonly(dest));
|
|
|
|
if (!hbitmap_merge(dest->bitmap, src->bitmap)) {
|
|
error_setg(errp, "Bitmaps are incompatible and can't be merged");
|
|
}
|
|
|
|
qemu_mutex_unlock(dest->mutex);
|
|
}
|