1ebab2259SFam Zheng /* 2ebab2259SFam Zheng * Block Dirty Bitmap 3ebab2259SFam Zheng * 4ebab2259SFam Zheng * Copyright (c) 2016 Red Hat. Inc 5ebab2259SFam Zheng * 6ebab2259SFam Zheng * Permission is hereby granted, free of charge, to any person obtaining a copy 7ebab2259SFam Zheng * of this software and associated documentation files (the "Software"), to deal 8ebab2259SFam Zheng * in the Software without restriction, including without limitation the rights 9ebab2259SFam Zheng * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10ebab2259SFam Zheng * copies of the Software, and to permit persons to whom the Software is 11ebab2259SFam Zheng * furnished to do so, subject to the following conditions: 12ebab2259SFam Zheng * 13ebab2259SFam Zheng * The above copyright notice and this permission notice shall be included in 14ebab2259SFam Zheng * all copies or substantial portions of the Software. 15ebab2259SFam Zheng * 16ebab2259SFam Zheng * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17ebab2259SFam Zheng * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18ebab2259SFam Zheng * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19ebab2259SFam Zheng * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20ebab2259SFam Zheng * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21ebab2259SFam Zheng * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22ebab2259SFam Zheng * THE SOFTWARE. 23ebab2259SFam Zheng */ 24ebab2259SFam Zheng #include "qemu/osdep.h" 25da34e65cSMarkus Armbruster #include "qapi/error.h" 26ebab2259SFam Zheng #include "qemu-common.h" 27ebab2259SFam Zheng #include "trace.h" 28ebab2259SFam Zheng #include "block/block_int.h" 29ebab2259SFam Zheng #include "block/blockjob.h" 30ebab2259SFam Zheng 31ebab2259SFam Zheng /** 32ebab2259SFam Zheng * A BdrvDirtyBitmap can be in three possible states: 33ebab2259SFam Zheng * (1) successor is NULL and disabled is false: full r/w mode 34ebab2259SFam Zheng * (2) successor is NULL and disabled is true: read only mode ("disabled") 35ebab2259SFam Zheng * (3) successor is set: frozen mode. 36ebab2259SFam Zheng * A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set, 37ebab2259SFam Zheng * or enabled. A frozen bitmap can only abdicate() or reclaim(). 38ebab2259SFam Zheng */ 39ebab2259SFam Zheng struct BdrvDirtyBitmap { 40b64bd51eSPaolo Bonzini QemuMutex *mutex; 41ebab2259SFam Zheng HBitmap *bitmap; /* Dirty sector bitmap implementation */ 42fb933437SFam Zheng HBitmap *meta; /* Meta dirty bitmap */ 43ebab2259SFam Zheng BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ 44ebab2259SFam Zheng char *name; /* Optional non-empty unique ID */ 45ebab2259SFam Zheng int64_t size; /* Size of the bitmap (Number of sectors) */ 468bfc932eSVladimir Sementsov-Ogievskiy bool disabled; /* Bitmap is disabled. It ignores all writes to 478bfc932eSVladimir Sementsov-Ogievskiy the device */ 48dc162c8eSFam Zheng int active_iterators; /* How many iterators are active */ 49d6883bc9SVladimir Sementsov-Ogievskiy bool readonly; /* Bitmap is read-only. This field also 50d6883bc9SVladimir Sementsov-Ogievskiy prevents the respective image from being 51d6883bc9SVladimir Sementsov-Ogievskiy modified (i.e. blocks writes and discards). 52d6883bc9SVladimir Sementsov-Ogievskiy Such operations must fail and both the image 53d6883bc9SVladimir Sementsov-Ogievskiy and this bitmap must remain unchanged while 54d6883bc9SVladimir Sementsov-Ogievskiy this flag is set. */ 55a0319aacSVladimir Sementsov-Ogievskiy bool autoload; /* For persistent bitmaps: bitmap must be 56a0319aacSVladimir Sementsov-Ogievskiy autoloaded on image opening */ 57*a88b179fSVladimir Sementsov-Ogievskiy bool persistent; /* bitmap must be saved to owner disk image */ 58ebab2259SFam Zheng QLIST_ENTRY(BdrvDirtyBitmap) list; 59ebab2259SFam Zheng }; 60ebab2259SFam Zheng 61dc162c8eSFam Zheng struct BdrvDirtyBitmapIter { 62dc162c8eSFam Zheng HBitmapIter hbi; 63dc162c8eSFam Zheng BdrvDirtyBitmap *bitmap; 64dc162c8eSFam Zheng }; 65dc162c8eSFam Zheng 662119882cSPaolo Bonzini static inline void bdrv_dirty_bitmaps_lock(BlockDriverState *bs) 672119882cSPaolo Bonzini { 682119882cSPaolo Bonzini qemu_mutex_lock(&bs->dirty_bitmap_mutex); 692119882cSPaolo Bonzini } 702119882cSPaolo Bonzini 712119882cSPaolo Bonzini static inline void bdrv_dirty_bitmaps_unlock(BlockDriverState *bs) 722119882cSPaolo Bonzini { 732119882cSPaolo Bonzini qemu_mutex_unlock(&bs->dirty_bitmap_mutex); 742119882cSPaolo Bonzini } 752119882cSPaolo Bonzini 76b64bd51eSPaolo Bonzini void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap) 77b64bd51eSPaolo Bonzini { 78b64bd51eSPaolo Bonzini qemu_mutex_lock(bitmap->mutex); 79b64bd51eSPaolo Bonzini } 80b64bd51eSPaolo Bonzini 81b64bd51eSPaolo Bonzini void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap) 82b64bd51eSPaolo Bonzini { 83b64bd51eSPaolo Bonzini qemu_mutex_unlock(bitmap->mutex); 84b64bd51eSPaolo Bonzini } 85b64bd51eSPaolo Bonzini 862119882cSPaolo Bonzini /* Called with BQL or dirty_bitmap lock taken. */ 87ebab2259SFam Zheng BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) 88ebab2259SFam Zheng { 89ebab2259SFam Zheng BdrvDirtyBitmap *bm; 90ebab2259SFam Zheng 91ebab2259SFam Zheng assert(name); 92ebab2259SFam Zheng QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { 93ebab2259SFam Zheng if (bm->name && !strcmp(name, bm->name)) { 94ebab2259SFam Zheng return bm; 95ebab2259SFam Zheng } 96ebab2259SFam Zheng } 97ebab2259SFam Zheng return NULL; 98ebab2259SFam Zheng } 99ebab2259SFam Zheng 1002119882cSPaolo Bonzini /* Called with BQL taken. */ 101ebab2259SFam Zheng void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) 102ebab2259SFam Zheng { 103ebab2259SFam Zheng assert(!bdrv_dirty_bitmap_frozen(bitmap)); 104ebab2259SFam Zheng g_free(bitmap->name); 105ebab2259SFam Zheng bitmap->name = NULL; 106*a88b179fSVladimir Sementsov-Ogievskiy bitmap->persistent = false; 107a0319aacSVladimir Sementsov-Ogievskiy bitmap->autoload = false; 108ebab2259SFam Zheng } 109ebab2259SFam Zheng 1102119882cSPaolo Bonzini /* Called with BQL taken. */ 111ebab2259SFam Zheng BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, 112ebab2259SFam Zheng uint32_t granularity, 113ebab2259SFam Zheng const char *name, 114ebab2259SFam Zheng Error **errp) 115ebab2259SFam Zheng { 116ebab2259SFam Zheng int64_t bitmap_size; 117ebab2259SFam Zheng BdrvDirtyBitmap *bitmap; 118ebab2259SFam Zheng uint32_t sector_granularity; 119ebab2259SFam Zheng 120ebab2259SFam Zheng assert((granularity & (granularity - 1)) == 0); 121ebab2259SFam Zheng 122ebab2259SFam Zheng if (name && bdrv_find_dirty_bitmap(bs, name)) { 123ebab2259SFam Zheng error_setg(errp, "Bitmap already exists: %s", name); 124ebab2259SFam Zheng return NULL; 125ebab2259SFam Zheng } 126ebab2259SFam Zheng sector_granularity = granularity >> BDRV_SECTOR_BITS; 127ebab2259SFam Zheng assert(sector_granularity); 128ebab2259SFam Zheng bitmap_size = bdrv_nb_sectors(bs); 129ebab2259SFam Zheng if (bitmap_size < 0) { 130ebab2259SFam Zheng error_setg_errno(errp, -bitmap_size, "could not get length of device"); 131ebab2259SFam Zheng errno = -bitmap_size; 132ebab2259SFam Zheng return NULL; 133ebab2259SFam Zheng } 134ebab2259SFam Zheng bitmap = g_new0(BdrvDirtyBitmap, 1); 135b64bd51eSPaolo Bonzini bitmap->mutex = &bs->dirty_bitmap_mutex; 136ebab2259SFam Zheng bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity)); 137ebab2259SFam Zheng bitmap->size = bitmap_size; 138ebab2259SFam Zheng bitmap->name = g_strdup(name); 139ebab2259SFam Zheng bitmap->disabled = false; 1402119882cSPaolo Bonzini bdrv_dirty_bitmaps_lock(bs); 141ebab2259SFam Zheng QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); 1422119882cSPaolo Bonzini bdrv_dirty_bitmaps_unlock(bs); 143ebab2259SFam Zheng return bitmap; 144ebab2259SFam Zheng } 145ebab2259SFam Zheng 146fb933437SFam Zheng /* bdrv_create_meta_dirty_bitmap 147fb933437SFam Zheng * 148fb933437SFam Zheng * Create a meta dirty bitmap that tracks the changes of bits in @bitmap. I.e. 149fb933437SFam Zheng * when a dirty status bit in @bitmap is changed (either from reset to set or 150fb933437SFam Zheng * the other way around), its respective meta dirty bitmap bit will be marked 151fb933437SFam Zheng * dirty as well. 152fb933437SFam Zheng * 153fb933437SFam Zheng * @bitmap: the block dirty bitmap for which to create a meta dirty bitmap. 154fb933437SFam Zheng * @chunk_size: how many bytes of bitmap data does each bit in the meta bitmap 155fb933437SFam Zheng * track. 156fb933437SFam Zheng */ 157fb933437SFam Zheng void bdrv_create_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap, 158fb933437SFam Zheng int chunk_size) 159fb933437SFam Zheng { 160fb933437SFam Zheng assert(!bitmap->meta); 161b64bd51eSPaolo Bonzini qemu_mutex_lock(bitmap->mutex); 162fb933437SFam Zheng bitmap->meta = hbitmap_create_meta(bitmap->bitmap, 163fb933437SFam Zheng chunk_size * BITS_PER_BYTE); 164b64bd51eSPaolo Bonzini qemu_mutex_unlock(bitmap->mutex); 165fb933437SFam Zheng } 166fb933437SFam Zheng 167fb933437SFam Zheng void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap) 168fb933437SFam Zheng { 169fb933437SFam Zheng assert(bitmap->meta); 170b64bd51eSPaolo Bonzini qemu_mutex_lock(bitmap->mutex); 171fb933437SFam Zheng hbitmap_free_meta(bitmap->bitmap); 172fb933437SFam Zheng bitmap->meta = NULL; 173b64bd51eSPaolo Bonzini qemu_mutex_unlock(bitmap->mutex); 174fb933437SFam Zheng } 175fb933437SFam Zheng 176b64bd51eSPaolo Bonzini int bdrv_dirty_bitmap_get_meta_locked(BlockDriverState *bs, 177fb933437SFam Zheng BdrvDirtyBitmap *bitmap, int64_t sector, 178fb933437SFam Zheng int nb_sectors) 179fb933437SFam Zheng { 180fb933437SFam Zheng uint64_t i; 181fb933437SFam Zheng int sectors_per_bit = 1 << hbitmap_granularity(bitmap->meta); 182fb933437SFam Zheng 183fb933437SFam Zheng /* To optimize: we can make hbitmap to internally check the range in a 184fb933437SFam Zheng * coarse level, or at least do it word by word. */ 185fb933437SFam Zheng for (i = sector; i < sector + nb_sectors; i += sectors_per_bit) { 186fb933437SFam Zheng if (hbitmap_get(bitmap->meta, i)) { 187fb933437SFam Zheng return true; 188fb933437SFam Zheng } 189fb933437SFam Zheng } 190fb933437SFam Zheng return false; 191fb933437SFam Zheng } 192fb933437SFam Zheng 193b64bd51eSPaolo Bonzini int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs, 194b64bd51eSPaolo Bonzini BdrvDirtyBitmap *bitmap, int64_t sector, 195b64bd51eSPaolo Bonzini int nb_sectors) 196b64bd51eSPaolo Bonzini { 197b64bd51eSPaolo Bonzini bool dirty; 198b64bd51eSPaolo Bonzini 199b64bd51eSPaolo Bonzini qemu_mutex_lock(bitmap->mutex); 200b64bd51eSPaolo Bonzini dirty = bdrv_dirty_bitmap_get_meta_locked(bs, bitmap, sector, nb_sectors); 201b64bd51eSPaolo Bonzini qemu_mutex_unlock(bitmap->mutex); 202b64bd51eSPaolo Bonzini 203b64bd51eSPaolo Bonzini return dirty; 204b64bd51eSPaolo Bonzini } 205b64bd51eSPaolo Bonzini 206fb933437SFam Zheng void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs, 207fb933437SFam Zheng BdrvDirtyBitmap *bitmap, int64_t sector, 208fb933437SFam Zheng int nb_sectors) 209fb933437SFam Zheng { 210b64bd51eSPaolo Bonzini qemu_mutex_lock(bitmap->mutex); 211fb933437SFam Zheng hbitmap_reset(bitmap->meta, sector, nb_sectors); 212b64bd51eSPaolo Bonzini qemu_mutex_unlock(bitmap->mutex); 213fb933437SFam Zheng } 214fb933437SFam Zheng 21515891facSFam Zheng int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap) 21615891facSFam Zheng { 21715891facSFam Zheng return bitmap->size; 21815891facSFam Zheng } 21915891facSFam Zheng 22015891facSFam Zheng const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap) 22115891facSFam Zheng { 22215891facSFam Zheng return bitmap->name; 22315891facSFam Zheng } 22415891facSFam Zheng 2252119882cSPaolo Bonzini /* Called with BQL taken. */ 226ebab2259SFam Zheng bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) 227ebab2259SFam Zheng { 228ebab2259SFam Zheng return bitmap->successor; 229ebab2259SFam Zheng } 230ebab2259SFam Zheng 2312119882cSPaolo Bonzini /* Called with BQL taken. */ 232ebab2259SFam Zheng bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) 233ebab2259SFam Zheng { 234ebab2259SFam Zheng return !(bitmap->disabled || bitmap->successor); 235ebab2259SFam Zheng } 236ebab2259SFam Zheng 2372119882cSPaolo Bonzini /* Called with BQL taken. */ 238ebab2259SFam Zheng DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap) 239ebab2259SFam Zheng { 240ebab2259SFam Zheng if (bdrv_dirty_bitmap_frozen(bitmap)) { 241ebab2259SFam Zheng return DIRTY_BITMAP_STATUS_FROZEN; 242ebab2259SFam Zheng } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 243ebab2259SFam Zheng return DIRTY_BITMAP_STATUS_DISABLED; 244ebab2259SFam Zheng } else { 245ebab2259SFam Zheng return DIRTY_BITMAP_STATUS_ACTIVE; 246ebab2259SFam Zheng } 247ebab2259SFam Zheng } 248ebab2259SFam Zheng 249ebab2259SFam Zheng /** 250ebab2259SFam Zheng * Create a successor bitmap destined to replace this bitmap after an operation. 251ebab2259SFam Zheng * Requires that the bitmap is not frozen and has no successor. 2522119882cSPaolo Bonzini * Called with BQL taken. 253ebab2259SFam Zheng */ 254ebab2259SFam Zheng int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, 255ebab2259SFam Zheng BdrvDirtyBitmap *bitmap, Error **errp) 256ebab2259SFam Zheng { 257ebab2259SFam Zheng uint64_t granularity; 258ebab2259SFam Zheng BdrvDirtyBitmap *child; 259ebab2259SFam Zheng 260ebab2259SFam Zheng if (bdrv_dirty_bitmap_frozen(bitmap)) { 261ebab2259SFam Zheng error_setg(errp, "Cannot create a successor for a bitmap that is " 262ebab2259SFam Zheng "currently frozen"); 263ebab2259SFam Zheng return -1; 264ebab2259SFam Zheng } 265ebab2259SFam Zheng assert(!bitmap->successor); 266ebab2259SFam Zheng 267ebab2259SFam Zheng /* Create an anonymous successor */ 268ebab2259SFam Zheng granularity = bdrv_dirty_bitmap_granularity(bitmap); 269ebab2259SFam Zheng child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 270ebab2259SFam Zheng if (!child) { 271ebab2259SFam Zheng return -1; 272ebab2259SFam Zheng } 273ebab2259SFam Zheng 274ebab2259SFam Zheng /* Successor will be on or off based on our current state. */ 275ebab2259SFam Zheng child->disabled = bitmap->disabled; 276ebab2259SFam Zheng 277ebab2259SFam Zheng /* Install the successor and freeze the parent */ 278ebab2259SFam Zheng bitmap->successor = child; 279ebab2259SFam Zheng return 0; 280ebab2259SFam Zheng } 281ebab2259SFam Zheng 282ebab2259SFam Zheng /** 283ebab2259SFam Zheng * For a bitmap with a successor, yield our name to the successor, 284ebab2259SFam Zheng * delete the old bitmap, and return a handle to the new bitmap. 2852119882cSPaolo Bonzini * Called with BQL taken. 286ebab2259SFam Zheng */ 287ebab2259SFam Zheng BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, 288ebab2259SFam Zheng BdrvDirtyBitmap *bitmap, 289ebab2259SFam Zheng Error **errp) 290ebab2259SFam Zheng { 291ebab2259SFam Zheng char *name; 292ebab2259SFam Zheng BdrvDirtyBitmap *successor = bitmap->successor; 293ebab2259SFam Zheng 294ebab2259SFam Zheng if (successor == NULL) { 295ebab2259SFam Zheng error_setg(errp, "Cannot relinquish control if " 296ebab2259SFam Zheng "there's no successor present"); 297ebab2259SFam Zheng return NULL; 298ebab2259SFam Zheng } 299ebab2259SFam Zheng 300ebab2259SFam Zheng name = bitmap->name; 301ebab2259SFam Zheng bitmap->name = NULL; 302ebab2259SFam Zheng successor->name = name; 303ebab2259SFam Zheng bitmap->successor = NULL; 304*a88b179fSVladimir Sementsov-Ogievskiy successor->persistent = bitmap->persistent; 305*a88b179fSVladimir Sementsov-Ogievskiy bitmap->persistent = false; 306a0319aacSVladimir Sementsov-Ogievskiy successor->autoload = bitmap->autoload; 307a0319aacSVladimir Sementsov-Ogievskiy bitmap->autoload = false; 308ebab2259SFam Zheng bdrv_release_dirty_bitmap(bs, bitmap); 309ebab2259SFam Zheng 310ebab2259SFam Zheng return successor; 311ebab2259SFam Zheng } 312ebab2259SFam Zheng 313ebab2259SFam Zheng /** 314ebab2259SFam Zheng * In cases of failure where we can no longer safely delete the parent, 315ebab2259SFam Zheng * we may wish to re-join the parent and child/successor. 316ebab2259SFam Zheng * The merged parent will be un-frozen, but not explicitly re-enabled. 3172119882cSPaolo Bonzini * Called with BQL taken. 318ebab2259SFam Zheng */ 319ebab2259SFam Zheng BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, 320ebab2259SFam Zheng BdrvDirtyBitmap *parent, 321ebab2259SFam Zheng Error **errp) 322ebab2259SFam Zheng { 323ebab2259SFam Zheng BdrvDirtyBitmap *successor = parent->successor; 324ebab2259SFam Zheng 325ebab2259SFam Zheng if (!successor) { 326ebab2259SFam Zheng error_setg(errp, "Cannot reclaim a successor when none is present"); 327ebab2259SFam Zheng return NULL; 328ebab2259SFam Zheng } 329ebab2259SFam Zheng 330ebab2259SFam Zheng if (!hbitmap_merge(parent->bitmap, successor->bitmap)) { 331ebab2259SFam Zheng error_setg(errp, "Merging of parent and successor bitmap failed"); 332ebab2259SFam Zheng return NULL; 333ebab2259SFam Zheng } 334ebab2259SFam Zheng bdrv_release_dirty_bitmap(bs, successor); 335ebab2259SFam Zheng parent->successor = NULL; 336ebab2259SFam Zheng 337ebab2259SFam Zheng return parent; 338ebab2259SFam Zheng } 339ebab2259SFam Zheng 340ebab2259SFam Zheng /** 341ebab2259SFam Zheng * Truncates _all_ bitmaps attached to a BDS. 3422119882cSPaolo Bonzini * Called with BQL taken. 343ebab2259SFam Zheng */ 344ebab2259SFam Zheng void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) 345ebab2259SFam Zheng { 346ebab2259SFam Zheng BdrvDirtyBitmap *bitmap; 347ebab2259SFam Zheng uint64_t size = bdrv_nb_sectors(bs); 348ebab2259SFam Zheng 3492119882cSPaolo Bonzini bdrv_dirty_bitmaps_lock(bs); 350ebab2259SFam Zheng QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { 351ebab2259SFam Zheng assert(!bdrv_dirty_bitmap_frozen(bitmap)); 352dc162c8eSFam Zheng assert(!bitmap->active_iterators); 353ebab2259SFam Zheng hbitmap_truncate(bitmap->bitmap, size); 354ebab2259SFam Zheng bitmap->size = size; 355ebab2259SFam Zheng } 3562119882cSPaolo Bonzini bdrv_dirty_bitmaps_unlock(bs); 357ebab2259SFam Zheng } 358ebab2259SFam Zheng 3592119882cSPaolo Bonzini /* Called with BQL taken. */ 360ebab2259SFam Zheng static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs, 361ebab2259SFam Zheng BdrvDirtyBitmap *bitmap, 362ebab2259SFam Zheng bool only_named) 363ebab2259SFam Zheng { 364ebab2259SFam Zheng BdrvDirtyBitmap *bm, *next; 3652119882cSPaolo Bonzini bdrv_dirty_bitmaps_lock(bs); 366ebab2259SFam Zheng QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { 367ebab2259SFam Zheng if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) { 368dc162c8eSFam Zheng assert(!bm->active_iterators); 369ebab2259SFam Zheng assert(!bdrv_dirty_bitmap_frozen(bm)); 370fb933437SFam Zheng assert(!bm->meta); 371ebab2259SFam Zheng QLIST_REMOVE(bm, list); 372ebab2259SFam Zheng hbitmap_free(bm->bitmap); 373ebab2259SFam Zheng g_free(bm->name); 374ebab2259SFam Zheng g_free(bm); 375ebab2259SFam Zheng 376ebab2259SFam Zheng if (bitmap) { 3772119882cSPaolo Bonzini goto out; 378ebab2259SFam Zheng } 379ebab2259SFam Zheng } 380ebab2259SFam Zheng } 3817105007aSFam Zheng if (bitmap) { 3827105007aSFam Zheng abort(); 3837105007aSFam Zheng } 3842119882cSPaolo Bonzini 3852119882cSPaolo Bonzini out: 3862119882cSPaolo Bonzini bdrv_dirty_bitmaps_unlock(bs); 387ebab2259SFam Zheng } 388ebab2259SFam Zheng 3892119882cSPaolo Bonzini /* Called with BQL taken. */ 390ebab2259SFam Zheng void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) 391ebab2259SFam Zheng { 392ebab2259SFam Zheng bdrv_do_release_matching_dirty_bitmap(bs, bitmap, false); 393ebab2259SFam Zheng } 394ebab2259SFam Zheng 395ebab2259SFam Zheng /** 396ebab2259SFam Zheng * Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()). 397ebab2259SFam Zheng * There must not be any frozen bitmaps attached. 3982119882cSPaolo Bonzini * Called with BQL taken. 399ebab2259SFam Zheng */ 400ebab2259SFam Zheng void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs) 401ebab2259SFam Zheng { 402ebab2259SFam Zheng bdrv_do_release_matching_dirty_bitmap(bs, NULL, true); 403ebab2259SFam Zheng } 404ebab2259SFam Zheng 4052119882cSPaolo Bonzini /* Called with BQL taken. */ 406ebab2259SFam Zheng void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) 407ebab2259SFam Zheng { 408ebab2259SFam Zheng assert(!bdrv_dirty_bitmap_frozen(bitmap)); 409ebab2259SFam Zheng bitmap->disabled = true; 410ebab2259SFam Zheng } 411ebab2259SFam Zheng 4122119882cSPaolo Bonzini /* Called with BQL taken. */ 413ebab2259SFam Zheng void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) 414ebab2259SFam Zheng { 415ebab2259SFam Zheng assert(!bdrv_dirty_bitmap_frozen(bitmap)); 416ebab2259SFam Zheng bitmap->disabled = false; 417ebab2259SFam Zheng } 418ebab2259SFam Zheng 419ebab2259SFam Zheng BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) 420ebab2259SFam Zheng { 421ebab2259SFam Zheng BdrvDirtyBitmap *bm; 422ebab2259SFam Zheng BlockDirtyInfoList *list = NULL; 423ebab2259SFam Zheng BlockDirtyInfoList **plist = &list; 424ebab2259SFam Zheng 4252119882cSPaolo Bonzini bdrv_dirty_bitmaps_lock(bs); 426ebab2259SFam Zheng QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { 427ebab2259SFam Zheng BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); 428ebab2259SFam Zheng BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); 429ebab2259SFam Zheng info->count = bdrv_get_dirty_count(bm); 430ebab2259SFam Zheng info->granularity = bdrv_dirty_bitmap_granularity(bm); 431ebab2259SFam Zheng info->has_name = !!bm->name; 432ebab2259SFam Zheng info->name = g_strdup(bm->name); 433ebab2259SFam Zheng info->status = bdrv_dirty_bitmap_status(bm); 434ebab2259SFam Zheng entry->value = info; 435ebab2259SFam Zheng *plist = entry; 436ebab2259SFam Zheng plist = &entry->next; 437ebab2259SFam Zheng } 4382119882cSPaolo Bonzini bdrv_dirty_bitmaps_unlock(bs); 439ebab2259SFam Zheng 440ebab2259SFam Zheng return list; 441ebab2259SFam Zheng } 442ebab2259SFam Zheng 443b64bd51eSPaolo Bonzini /* Called within bdrv_dirty_bitmap_lock..unlock */ 444b64bd51eSPaolo Bonzini int bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, 445ebab2259SFam Zheng int64_t sector) 446ebab2259SFam Zheng { 447ebab2259SFam Zheng if (bitmap) { 448ebab2259SFam Zheng return hbitmap_get(bitmap->bitmap, sector); 449ebab2259SFam Zheng } else { 450ebab2259SFam Zheng return 0; 451ebab2259SFam Zheng } 452ebab2259SFam Zheng } 453ebab2259SFam Zheng 454ebab2259SFam Zheng /** 455ebab2259SFam Zheng * Chooses a default granularity based on the existing cluster size, 456ebab2259SFam Zheng * but clamped between [4K, 64K]. Defaults to 64K in the case that there 457ebab2259SFam Zheng * is no cluster size information available. 458ebab2259SFam Zheng */ 459ebab2259SFam Zheng uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) 460ebab2259SFam Zheng { 461ebab2259SFam Zheng BlockDriverInfo bdi; 462ebab2259SFam Zheng uint32_t granularity; 463ebab2259SFam Zheng 464ebab2259SFam Zheng if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) { 465ebab2259SFam Zheng granularity = MAX(4096, bdi.cluster_size); 466ebab2259SFam Zheng granularity = MIN(65536, granularity); 467ebab2259SFam Zheng } else { 468ebab2259SFam Zheng granularity = 65536; 469ebab2259SFam Zheng } 470ebab2259SFam Zheng 471ebab2259SFam Zheng return granularity; 472ebab2259SFam Zheng } 473ebab2259SFam Zheng 474ba06ff1aSVladimir Sementsov-Ogievskiy uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap) 475ebab2259SFam Zheng { 476ebab2259SFam Zheng return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); 477ebab2259SFam Zheng } 478ebab2259SFam Zheng 4796d3f4049SFam Zheng uint32_t bdrv_dirty_bitmap_meta_granularity(BdrvDirtyBitmap *bitmap) 4806d3f4049SFam Zheng { 4816d3f4049SFam Zheng return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->meta); 4826d3f4049SFam Zheng } 4836d3f4049SFam Zheng 484dc162c8eSFam Zheng BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap, 485dc162c8eSFam Zheng uint64_t first_sector) 486ebab2259SFam Zheng { 487dc162c8eSFam Zheng BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1); 488dc162c8eSFam Zheng hbitmap_iter_init(&iter->hbi, bitmap->bitmap, first_sector); 489dc162c8eSFam Zheng iter->bitmap = bitmap; 490dc162c8eSFam Zheng bitmap->active_iterators++; 491dc162c8eSFam Zheng return iter; 492dc162c8eSFam Zheng } 493dc162c8eSFam Zheng 4946d3f4049SFam Zheng BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap) 4956d3f4049SFam Zheng { 4966d3f4049SFam Zheng BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1); 4976d3f4049SFam Zheng hbitmap_iter_init(&iter->hbi, bitmap->meta, 0); 4986d3f4049SFam Zheng iter->bitmap = bitmap; 4996d3f4049SFam Zheng bitmap->active_iterators++; 5006d3f4049SFam Zheng return iter; 5016d3f4049SFam Zheng } 5026d3f4049SFam Zheng 503dc162c8eSFam Zheng void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter) 504dc162c8eSFam Zheng { 505dc162c8eSFam Zheng if (!iter) { 506dc162c8eSFam Zheng return; 507dc162c8eSFam Zheng } 508dc162c8eSFam Zheng assert(iter->bitmap->active_iterators > 0); 509dc162c8eSFam Zheng iter->bitmap->active_iterators--; 510dc162c8eSFam Zheng g_free(iter); 511dc162c8eSFam Zheng } 512dc162c8eSFam Zheng 513dc162c8eSFam Zheng int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter) 514dc162c8eSFam Zheng { 515dc162c8eSFam Zheng return hbitmap_iter_next(&iter->hbi); 516ebab2259SFam Zheng } 517ebab2259SFam Zheng 518b64bd51eSPaolo Bonzini /* Called within bdrv_dirty_bitmap_lock..unlock */ 519b64bd51eSPaolo Bonzini void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap, 5206d078599SDenis V. Lunev int64_t cur_sector, int64_t nr_sectors) 521ebab2259SFam Zheng { 522ebab2259SFam Zheng assert(bdrv_dirty_bitmap_enabled(bitmap)); 523d6883bc9SVladimir Sementsov-Ogievskiy assert(!bdrv_dirty_bitmap_readonly(bitmap)); 524ebab2259SFam Zheng hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); 525ebab2259SFam Zheng } 526ebab2259SFam Zheng 527b64bd51eSPaolo Bonzini void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, 528b64bd51eSPaolo Bonzini int64_t cur_sector, int64_t nr_sectors) 529b64bd51eSPaolo Bonzini { 530b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(bitmap); 531b64bd51eSPaolo Bonzini bdrv_set_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors); 532b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(bitmap); 533b64bd51eSPaolo Bonzini } 534b64bd51eSPaolo Bonzini 535b64bd51eSPaolo Bonzini /* Called within bdrv_dirty_bitmap_lock..unlock */ 536b64bd51eSPaolo Bonzini void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap, 5376d078599SDenis V. Lunev int64_t cur_sector, int64_t nr_sectors) 538ebab2259SFam Zheng { 539ebab2259SFam Zheng assert(bdrv_dirty_bitmap_enabled(bitmap)); 540d6883bc9SVladimir Sementsov-Ogievskiy assert(!bdrv_dirty_bitmap_readonly(bitmap)); 541ebab2259SFam Zheng hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); 542ebab2259SFam Zheng } 543ebab2259SFam Zheng 544b64bd51eSPaolo Bonzini void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, 545b64bd51eSPaolo Bonzini int64_t cur_sector, int64_t nr_sectors) 546b64bd51eSPaolo Bonzini { 547b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(bitmap); 548b64bd51eSPaolo Bonzini bdrv_reset_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors); 549b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(bitmap); 550b64bd51eSPaolo Bonzini } 551b64bd51eSPaolo Bonzini 552ebab2259SFam Zheng void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out) 553ebab2259SFam Zheng { 554ebab2259SFam Zheng assert(bdrv_dirty_bitmap_enabled(bitmap)); 555d6883bc9SVladimir Sementsov-Ogievskiy assert(!bdrv_dirty_bitmap_readonly(bitmap)); 556b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(bitmap); 557ebab2259SFam Zheng if (!out) { 558ebab2259SFam Zheng hbitmap_reset_all(bitmap->bitmap); 559ebab2259SFam Zheng } else { 560ebab2259SFam Zheng HBitmap *backup = bitmap->bitmap; 561ebab2259SFam Zheng bitmap->bitmap = hbitmap_alloc(bitmap->size, 562ebab2259SFam Zheng hbitmap_granularity(backup)); 563ebab2259SFam Zheng *out = backup; 564ebab2259SFam Zheng } 565b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(bitmap); 566ebab2259SFam Zheng } 567ebab2259SFam Zheng 568ebab2259SFam Zheng void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in) 569ebab2259SFam Zheng { 570ebab2259SFam Zheng HBitmap *tmp = bitmap->bitmap; 571ebab2259SFam Zheng assert(bdrv_dirty_bitmap_enabled(bitmap)); 572d6883bc9SVladimir Sementsov-Ogievskiy assert(!bdrv_dirty_bitmap_readonly(bitmap)); 573ebab2259SFam Zheng bitmap->bitmap = in; 574ebab2259SFam Zheng hbitmap_free(tmp); 575ebab2259SFam Zheng } 576ebab2259SFam Zheng 577882c36f5SVladimir Sementsov-Ogievskiy uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap, 578882c36f5SVladimir Sementsov-Ogievskiy uint64_t start, uint64_t count) 579882c36f5SVladimir Sementsov-Ogievskiy { 580882c36f5SVladimir Sementsov-Ogievskiy return hbitmap_serialization_size(bitmap->bitmap, start, count); 581882c36f5SVladimir Sementsov-Ogievskiy } 582882c36f5SVladimir Sementsov-Ogievskiy 583882c36f5SVladimir Sementsov-Ogievskiy uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap) 584882c36f5SVladimir Sementsov-Ogievskiy { 585882c36f5SVladimir Sementsov-Ogievskiy return hbitmap_serialization_granularity(bitmap->bitmap); 586882c36f5SVladimir Sementsov-Ogievskiy } 587882c36f5SVladimir Sementsov-Ogievskiy 588882c36f5SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap, 589882c36f5SVladimir Sementsov-Ogievskiy uint8_t *buf, uint64_t start, 590882c36f5SVladimir Sementsov-Ogievskiy uint64_t count) 591882c36f5SVladimir Sementsov-Ogievskiy { 592882c36f5SVladimir Sementsov-Ogievskiy hbitmap_serialize_part(bitmap->bitmap, buf, start, count); 593882c36f5SVladimir Sementsov-Ogievskiy } 594882c36f5SVladimir Sementsov-Ogievskiy 595882c36f5SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_deserialize_part(BdrvDirtyBitmap *bitmap, 596882c36f5SVladimir Sementsov-Ogievskiy uint8_t *buf, uint64_t start, 597882c36f5SVladimir Sementsov-Ogievskiy uint64_t count, bool finish) 598882c36f5SVladimir Sementsov-Ogievskiy { 599882c36f5SVladimir Sementsov-Ogievskiy hbitmap_deserialize_part(bitmap->bitmap, buf, start, count, finish); 600882c36f5SVladimir Sementsov-Ogievskiy } 601882c36f5SVladimir Sementsov-Ogievskiy 602882c36f5SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap, 603882c36f5SVladimir Sementsov-Ogievskiy uint64_t start, uint64_t count, 604882c36f5SVladimir Sementsov-Ogievskiy bool finish) 605882c36f5SVladimir Sementsov-Ogievskiy { 606882c36f5SVladimir Sementsov-Ogievskiy hbitmap_deserialize_zeroes(bitmap->bitmap, start, count, finish); 607882c36f5SVladimir Sementsov-Ogievskiy } 608882c36f5SVladimir Sementsov-Ogievskiy 6096bdc8b71SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap, 6106bdc8b71SVladimir Sementsov-Ogievskiy uint64_t start, uint64_t count, 6116bdc8b71SVladimir Sementsov-Ogievskiy bool finish) 6126bdc8b71SVladimir Sementsov-Ogievskiy { 6136bdc8b71SVladimir Sementsov-Ogievskiy hbitmap_deserialize_ones(bitmap->bitmap, start, count, finish); 6146bdc8b71SVladimir Sementsov-Ogievskiy } 6156bdc8b71SVladimir Sementsov-Ogievskiy 616882c36f5SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap) 617882c36f5SVladimir Sementsov-Ogievskiy { 618882c36f5SVladimir Sementsov-Ogievskiy hbitmap_deserialize_finish(bitmap->bitmap); 619882c36f5SVladimir Sementsov-Ogievskiy } 620882c36f5SVladimir Sementsov-Ogievskiy 621ebab2259SFam Zheng void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, 6226d078599SDenis V. Lunev int64_t nr_sectors) 623ebab2259SFam Zheng { 624ebab2259SFam Zheng BdrvDirtyBitmap *bitmap; 6252119882cSPaolo Bonzini 6262119882cSPaolo Bonzini if (QLIST_EMPTY(&bs->dirty_bitmaps)) { 6272119882cSPaolo Bonzini return; 6282119882cSPaolo Bonzini } 6292119882cSPaolo Bonzini 6302119882cSPaolo Bonzini bdrv_dirty_bitmaps_lock(bs); 631ebab2259SFam Zheng QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { 632ebab2259SFam Zheng if (!bdrv_dirty_bitmap_enabled(bitmap)) { 633ebab2259SFam Zheng continue; 634ebab2259SFam Zheng } 635d6883bc9SVladimir Sementsov-Ogievskiy assert(!bdrv_dirty_bitmap_readonly(bitmap)); 636ebab2259SFam Zheng hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); 637ebab2259SFam Zheng } 6382119882cSPaolo Bonzini bdrv_dirty_bitmaps_unlock(bs); 639ebab2259SFam Zheng } 640ebab2259SFam Zheng 641ebab2259SFam Zheng /** 642dc162c8eSFam Zheng * Advance a BdrvDirtyBitmapIter to an arbitrary offset. 643ebab2259SFam Zheng */ 644dc162c8eSFam Zheng void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t sector_num) 645ebab2259SFam Zheng { 646dc162c8eSFam Zheng hbitmap_iter_init(&iter->hbi, iter->hbi.hb, sector_num); 647ebab2259SFam Zheng } 648ebab2259SFam Zheng 649ebab2259SFam Zheng int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) 650ebab2259SFam Zheng { 651ebab2259SFam Zheng return hbitmap_count(bitmap->bitmap); 652ebab2259SFam Zheng } 6536d3f4049SFam Zheng 6546d3f4049SFam Zheng int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap) 6556d3f4049SFam Zheng { 6566d3f4049SFam Zheng return hbitmap_count(bitmap->meta); 6576d3f4049SFam Zheng } 658d6883bc9SVladimir Sementsov-Ogievskiy 659d6883bc9SVladimir Sementsov-Ogievskiy bool bdrv_dirty_bitmap_readonly(const BdrvDirtyBitmap *bitmap) 660d6883bc9SVladimir Sementsov-Ogievskiy { 661d6883bc9SVladimir Sementsov-Ogievskiy return bitmap->readonly; 662d6883bc9SVladimir Sementsov-Ogievskiy } 663d6883bc9SVladimir Sementsov-Ogievskiy 664d6883bc9SVladimir Sementsov-Ogievskiy /* Called with BQL taken. */ 665d6883bc9SVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value) 666d6883bc9SVladimir Sementsov-Ogievskiy { 667d6883bc9SVladimir Sementsov-Ogievskiy qemu_mutex_lock(bitmap->mutex); 668d6883bc9SVladimir Sementsov-Ogievskiy bitmap->readonly = value; 669d6883bc9SVladimir Sementsov-Ogievskiy qemu_mutex_unlock(bitmap->mutex); 670d6883bc9SVladimir Sementsov-Ogievskiy } 671d6883bc9SVladimir Sementsov-Ogievskiy 672d6883bc9SVladimir Sementsov-Ogievskiy bool bdrv_has_readonly_bitmaps(BlockDriverState *bs) 673d6883bc9SVladimir Sementsov-Ogievskiy { 674d6883bc9SVladimir Sementsov-Ogievskiy BdrvDirtyBitmap *bm; 675d6883bc9SVladimir Sementsov-Ogievskiy QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { 676d6883bc9SVladimir Sementsov-Ogievskiy if (bm->readonly) { 677d6883bc9SVladimir Sementsov-Ogievskiy return true; 678d6883bc9SVladimir Sementsov-Ogievskiy } 679d6883bc9SVladimir Sementsov-Ogievskiy } 680d6883bc9SVladimir Sementsov-Ogievskiy 681d6883bc9SVladimir Sementsov-Ogievskiy return false; 682d6883bc9SVladimir Sementsov-Ogievskiy } 683a0319aacSVladimir Sementsov-Ogievskiy 684a0319aacSVladimir Sementsov-Ogievskiy /* Called with BQL taken. */ 685a0319aacSVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_set_autoload(BdrvDirtyBitmap *bitmap, bool autoload) 686a0319aacSVladimir Sementsov-Ogievskiy { 687a0319aacSVladimir Sementsov-Ogievskiy qemu_mutex_lock(bitmap->mutex); 688a0319aacSVladimir Sementsov-Ogievskiy bitmap->autoload = autoload; 689a0319aacSVladimir Sementsov-Ogievskiy qemu_mutex_unlock(bitmap->mutex); 690a0319aacSVladimir Sementsov-Ogievskiy } 691a0319aacSVladimir Sementsov-Ogievskiy 692a0319aacSVladimir Sementsov-Ogievskiy bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap) 693a0319aacSVladimir Sementsov-Ogievskiy { 694a0319aacSVladimir Sementsov-Ogievskiy return bitmap->autoload; 695a0319aacSVladimir Sementsov-Ogievskiy } 696*a88b179fSVladimir Sementsov-Ogievskiy 697*a88b179fSVladimir Sementsov-Ogievskiy /* Called with BQL taken. */ 698*a88b179fSVladimir Sementsov-Ogievskiy void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap, bool persistent) 699*a88b179fSVladimir Sementsov-Ogievskiy { 700*a88b179fSVladimir Sementsov-Ogievskiy qemu_mutex_lock(bitmap->mutex); 701*a88b179fSVladimir Sementsov-Ogievskiy bitmap->persistent = persistent; 702*a88b179fSVladimir Sementsov-Ogievskiy qemu_mutex_unlock(bitmap->mutex); 703*a88b179fSVladimir Sementsov-Ogievskiy } 704*a88b179fSVladimir Sementsov-Ogievskiy 705*a88b179fSVladimir Sementsov-Ogievskiy bool bdrv_dirty_bitmap_get_persistance(BdrvDirtyBitmap *bitmap) 706*a88b179fSVladimir Sementsov-Ogievskiy { 707*a88b179fSVladimir Sementsov-Ogievskiy return bitmap->persistent; 708*a88b179fSVladimir Sementsov-Ogievskiy } 709*a88b179fSVladimir Sementsov-Ogievskiy 710*a88b179fSVladimir Sementsov-Ogievskiy bool bdrv_has_changed_persistent_bitmaps(BlockDriverState *bs) 711*a88b179fSVladimir Sementsov-Ogievskiy { 712*a88b179fSVladimir Sementsov-Ogievskiy BdrvDirtyBitmap *bm; 713*a88b179fSVladimir Sementsov-Ogievskiy QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { 714*a88b179fSVladimir Sementsov-Ogievskiy if (bm->persistent && !bm->readonly) { 715*a88b179fSVladimir Sementsov-Ogievskiy return true; 716*a88b179fSVladimir Sementsov-Ogievskiy } 717*a88b179fSVladimir Sementsov-Ogievskiy } 718*a88b179fSVladimir Sementsov-Ogievskiy 719*a88b179fSVladimir Sementsov-Ogievskiy return false; 720*a88b179fSVladimir Sementsov-Ogievskiy } 721