diff options
Diffstat (limited to 'block/dirty-bitmap.c')
| -rw-r--r-- | block/dirty-bitmap.c | 154 |
1 files changed, 146 insertions, 8 deletions
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index a04c6e4154..543bddb9b5 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -43,8 +43,18 @@ struct BdrvDirtyBitmap { BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ char *name; /* Optional non-empty unique ID */ int64_t size; /* Size of the bitmap (Number of sectors) */ - bool disabled; /* Bitmap is read-only */ + bool disabled; /* Bitmap is disabled. It ignores all writes to + the device */ int active_iterators; /* How many iterators are active */ + bool readonly; /* Bitmap is read-only. This field also + prevents the respective image from being + modified (i.e. blocks writes and discards). + Such operations must fail and both the image + and this bitmap must remain unchanged while + this flag is set. */ + bool autoload; /* For persistent bitmaps: bitmap must be + autoloaded on image opening */ + bool persistent; /* bitmap must be saved to owner disk image */ QLIST_ENTRY(BdrvDirtyBitmap) list; }; @@ -93,6 +103,8 @@ void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) assert(!bdrv_dirty_bitmap_frozen(bitmap)); g_free(bitmap->name); bitmap->name = NULL; + bitmap->persistent = false; + bitmap->autoload = false; } /* Called with BQL taken. */ @@ -289,6 +301,10 @@ BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, bitmap->name = NULL; successor->name = name; bitmap->successor = NULL; + successor->persistent = bitmap->persistent; + bitmap->persistent = false; + successor->autoload = bitmap->autoload; + bitmap->autoload = false; bdrv_release_dirty_bitmap(bs, bitmap); return successor; @@ -340,15 +356,20 @@ void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) bdrv_dirty_bitmaps_unlock(bs); } +static bool bdrv_dirty_bitmap_has_name(BdrvDirtyBitmap *bitmap) +{ + return !!bdrv_dirty_bitmap_name(bitmap); +} + /* Called with BQL taken. */ -static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs, - BdrvDirtyBitmap *bitmap, - bool only_named) +static void bdrv_do_release_matching_dirty_bitmap( + BlockDriverState *bs, BdrvDirtyBitmap *bitmap, + bool (*cond)(BdrvDirtyBitmap *bitmap)) { BdrvDirtyBitmap *bm, *next; bdrv_dirty_bitmaps_lock(bs); QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { - if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) { + if ((!bitmap || bm == bitmap) && (!cond || cond(bm))) { assert(!bm->active_iterators); assert(!bdrv_dirty_bitmap_frozen(bm)); assert(!bm->meta); @@ -373,17 +394,47 @@ out: /* Called with BQL taken. */ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) { - bdrv_do_release_matching_dirty_bitmap(bs, bitmap, false); + bdrv_do_release_matching_dirty_bitmap(bs, bitmap, NULL); } /** * Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()). * There must not be any frozen bitmaps attached. + * This function does not remove persistent bitmaps from the storage. * Called with BQL taken. */ void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs) { - bdrv_do_release_matching_dirty_bitmap(bs, NULL, true); + bdrv_do_release_matching_dirty_bitmap(bs, NULL, bdrv_dirty_bitmap_has_name); +} + +/** + * Release all persistent dirty bitmaps attached to a BDS (for use in + * bdrv_inactivate_recurse()). + * There must not be any frozen bitmaps attached. + * This function does not remove persistent bitmaps from the storage. + */ +void bdrv_release_persistent_dirty_bitmaps(BlockDriverState *bs) +{ + bdrv_do_release_matching_dirty_bitmap(bs, NULL, + bdrv_dirty_bitmap_get_persistance); +} + +/** + * Remove persistent dirty bitmap from the storage if it exists. + * Absence of bitmap is not an error, because we have the following scenario: + * BdrvDirtyBitmap can have .persistent = true but not yet saved and have no + * stored version. For such bitmap bdrv_remove_persistent_dirty_bitmap() should + * not fail. + * This function doesn't release corresponding BdrvDirtyBitmap. + */ +void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs, + const char *name, + Error **errp) +{ + if (bs->drv && bs->drv->bdrv_remove_persistent_dirty_bitmap) { + bs->drv->bdrv_remove_persistent_dirty_bitmap(bs, name, errp); + } } /* Called with BQL taken. */ @@ -455,7 +506,7 @@ uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) return granularity; } -uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) +uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap) { return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); } @@ -504,6 +555,7 @@ void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap, int64_t cur_sector, int64_t nr_sectors) { assert(bdrv_dirty_bitmap_enabled(bitmap)); + assert(!bdrv_dirty_bitmap_readonly(bitmap)); hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); } @@ -520,6 +572,7 @@ void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap, int64_t cur_sector, int64_t nr_sectors) { assert(bdrv_dirty_bitmap_enabled(bitmap)); + assert(!bdrv_dirty_bitmap_readonly(bitmap)); hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); } @@ -534,6 +587,7 @@ void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *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); @@ -550,6 +604,7 @@ 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); } @@ -586,6 +641,13 @@ void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap, hbitmap_deserialize_zeroes(bitmap->bitmap, start, count, finish); } +void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap, + uint64_t start, uint64_t count, + bool finish) +{ + hbitmap_deserialize_ones(bitmap->bitmap, start, count, finish); +} + void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap) { hbitmap_deserialize_finish(bitmap->bitmap); @@ -605,6 +667,7 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, if (!bdrv_dirty_bitmap_enabled(bitmap)) { continue; } + assert(!bdrv_dirty_bitmap_readonly(bitmap)); hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); } bdrv_dirty_bitmaps_unlock(bs); @@ -627,3 +690,78 @@ 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_autoload(BdrvDirtyBitmap *bitmap, bool autoload) +{ + qemu_mutex_lock(bitmap->mutex); + bitmap->autoload = autoload; + qemu_mutex_unlock(bitmap->mutex); +} + +bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap) +{ + return bitmap->autoload; +} + +/* 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); +} |