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block: simplify code around releasing bitmaps 

QLIST_REMOVE does not require walking the list, and once the "bitmap"
argument is removed from bdrv_do_release_matching_dirty_bitmap_locked
the code simplifies a lot and it is worth inlining everything in the
callers of bdrv_do_release_matching_dirty_bitmap.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180326104037.6894-1-pbonzini@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-06-11 14:53:31 -04:00 committed by John Snow
parent ab41fc4853
commit b133c27f5d
1 changed files with 32 additions and 52 deletions
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84
block/dirty-bitmap.c
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@ -249,49 +249,16 @@ void bdrv_dirty_bitmap_enable_successor(BdrvDirtyBitmap *bitmap)
qemu_mutex_unlock(bitmap->mutex);
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
static void bdrv_do_release_matching_dirty_bitmap_locked(
BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
bool (*cond)(BdrvDirtyBitmap *bitmap))
/* Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken. */
static void bdrv_release_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap)
{
BdrvDirtyBitmap *bm, *next;
QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
if ((!bitmap || bm == bitmap) && (!cond || cond(bm))) {
assert(!bm->active_iterators);
assert(!bdrv_dirty_bitmap_frozen(bm));
assert(!bm->meta);
QLIST_REMOVE(bm, list);
hbitmap_free(bm->bitmap);
g_free(bm->name);
g_free(bm);
if (bitmap) {
return;
}
}
}
if (bitmap) {
abort();
}
}
/* Called with BQL taken. */
static void bdrv_do_release_matching_dirty_bitmap(
BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
bool (*cond)(BdrvDirtyBitmap *bitmap))
{
bdrv_dirty_bitmaps_lock(bs);
bdrv_do_release_matching_dirty_bitmap_locked(bs, bitmap, cond);
bdrv_dirty_bitmaps_unlock(bs);
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
static void bdrv_release_dirty_bitmap_locked(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap)
{
bdrv_do_release_matching_dirty_bitmap_locked(bs, bitmap, NULL);
assert(!bitmap->active_iterators);
assert(!bdrv_dirty_bitmap_frozen(bitmap));
assert(!bitmap->meta);
QLIST_REMOVE(bitmap, list);
hbitmap_free(bitmap->bitmap);
g_free(bitmap->name);
g_free(bitmap);
}
/**
@ -344,7 +311,7 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
error_setg(errp, "Merging of parent and successor bitmap failed");
return NULL;
}
bdrv_release_dirty_bitmap_locked(bs, successor);
bdrv_release_dirty_bitmap_locked(successor);
parent->successor = NULL;
return parent;
@ -382,15 +349,12 @@ void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes)
bdrv_dirty_bitmaps_unlock(bs);
}
static bool bdrv_dirty_bitmap_has_name(BdrvDirtyBitmap *bitmap)
{
return !!bdrv_dirty_bitmap_name(bitmap);
}
/* Called with BQL taken. */
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
{
bdrv_do_release_matching_dirty_bitmap(bs, bitmap, NULL);
bdrv_dirty_bitmaps_lock(bs);
bdrv_release_dirty_bitmap_locked(bitmap);
bdrv_dirty_bitmaps_unlock(bs);
}
/**
@ -401,7 +365,15 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
*/
void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
{
bdrv_do_release_matching_dirty_bitmap(bs, NULL, bdrv_dirty_bitmap_has_name);
BdrvDirtyBitmap *bm, *next;
bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
if (bdrv_dirty_bitmap_name(bm)) {
bdrv_release_dirty_bitmap_locked(bm);
}
}
bdrv_dirty_bitmaps_unlock(bs);
}
/**
@ -409,11 +381,19 @@ void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
* bdrv_inactivate_recurse()).
* 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_persistent_dirty_bitmaps(BlockDriverState *bs)
{
bdrv_do_release_matching_dirty_bitmap(bs, NULL,
bdrv_dirty_bitmap_get_persistance);
BdrvDirtyBitmap *bm, *next;
bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
if (bdrv_dirty_bitmap_get_persistance(bm)) {
bdrv_release_dirty_bitmap_locked(bm);
}
}
bdrv_dirty_bitmaps_unlock(bs);
}
/**