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block/dirty-bitmaps: add user_locked status checker 

Instead of both frozen and qmp_locked checks, wrap it into one check.
frozen implies the bitmap is split in two (for backup), and shouldn't
be modified. qmp_locked implies it's being used by another operation,
like being exported over NBD. In both cases it means we shouldn't allow
the user to modify it in any meaningful way.

Replace any usages where we check both frozen and qmp_locked with the
new check.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20181002230218.13949-2-jsnow@redhat.com
[w/edits Suggested-By: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]
Signed-off-by: John Snow <jsnow@redhat.com>
master
John Snow 2018-10-29 16:23:16 -04:00
parent 2ea427efff
commit 993edc0ce0
4 changed files with 17 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/dirty-bitmap.c
View File

@ -176,6 +176,12 @@ bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap)
return bitmap->successor;
}
/* Both conditions disallow user-modification via QMP. */
bool bdrv_dirty_bitmap_user_locked(BdrvDirtyBitmap *bitmap) {
return bdrv_dirty_bitmap_frozen(bitmap) ||
bdrv_dirty_bitmap_qmp_locked(bitmap);
}
void bdrv_dirty_bitmap_set_qmp_locked(BdrvDirtyBitmap *bitmap, bool qmp_locked)
{
qemu_mutex_lock(bitmap->mutex);

29
blockdev.c
View File

@ -2010,11 +2010,8 @@ static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
return;
}
if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
error_setg(errp, "Cannot modify a frozen bitmap");
return;
} else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
error_setg(errp, "Cannot modify a locked bitmap");
if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
error_setg(errp, "Cannot modify a bitmap in use by another operation");
return;
} else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
error_setg(errp, "Cannot clear a disabled bitmap");
@ -2883,15 +2880,10 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
if (bdrv_dirty_bitmap_user_locked(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be removed",
name);
return;
} else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently locked and cannot be removed",
name);
"Bitmap '%s' is currently in use by another operation and"
" cannot be removed", name);
return;
}
@ -2921,15 +2913,10 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
if (bdrv_dirty_bitmap_user_locked(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be modified",
name);
return;
} else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently locked and cannot be modified",
name);
"Bitmap '%s' is currently in use by another operation"
" and cannot be cleared", name);
return;
} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
error_setg(errp,

1
include/block/dirty-bitmap.h
View File

@ -94,6 +94,7 @@ bool bdrv_has_readonly_bitmaps(BlockDriverState *bs);
bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap);
bool bdrv_dirty_bitmap_get_persistance(BdrvDirtyBitmap *bitmap);
bool bdrv_dirty_bitmap_qmp_locked(BdrvDirtyBitmap *bitmap);
bool bdrv_dirty_bitmap_user_locked(BdrvDirtyBitmap *bitmap);
bool bdrv_has_changed_persistent_bitmaps(BlockDriverState *bs);
BdrvDirtyBitmap *bdrv_dirty_bitmap_next(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap);

10
migration/block-dirty-bitmap.c
View File

@ -301,14 +301,8 @@ static int init_dirty_bitmap_migration(void)
goto fail;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_report("Can't migrate frozen dirty bitmap: '%s",
bdrv_dirty_bitmap_name(bitmap));
goto fail;
}
if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
error_report("Can't migrate locked dirty bitmap: '%s",
if (bdrv_dirty_bitmap_user_locked(bitmap)) {
error_report("Can't migrate a bitmap that is in use by another operation: '%s'",
bdrv_dirty_bitmap_name(bitmap));
goto fail;
}