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[Qemu-block] [PATCH v4 4/6] block/dirty-bitmaps: prohibit enable/disable
From: |
John Snow |
Subject: |
[Qemu-block] [PATCH v4 4/6] block/dirty-bitmaps: prohibit enable/disable on locked/frozen bitmaps |
Date: |
Tue, 2 Oct 2018 19:02:16 -0400 |
We're not being consistent about this. If it's in use by an operation,
the user should not be able to change the behavior of that bitmap.
Signed-off-by: John Snow <address@hidden>
---
blockdev.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index cccd36b5e7..d0febfca79 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2058,6 +2058,13 @@ static void
block_dirty_bitmap_enable_prepare(BlkActionState *common,
return;
}
+ if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
+ error_setg(errp,
+ "Bitmap '%s' is currently in use by another operation"
+ " and cannot be enabled", action->name);
+ return;
+ }
+
state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
bdrv_enable_dirty_bitmap(state->bitmap);
}
@@ -2092,6 +2099,13 @@ static void
block_dirty_bitmap_disable_prepare(BlkActionState *common,
return;
}
+ if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
+ error_setg(errp,
+ "Bitmap '%s' is currently in use by another operation"
+ " and cannot be disabled", action->name);
+ return;
+ }
+
state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
bdrv_disable_dirty_bitmap(state->bitmap);
}
@@ -2933,10 +2947,10 @@ void qmp_x_block_dirty_bitmap_enable(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 enabled",
- name);
+ "Bitmap '%s' is currently in use by another operation"
+ " and cannot be enabled", name);
return;
}
@@ -2954,10 +2968,10 @@ void qmp_x_block_dirty_bitmap_disable(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 disabled",
- name);
+ "Bitmap '%s' is currently in use by another operation"
+ " and cannot be disabled", name);
return;
}
--
2.14.4
- Re: [Qemu-block] [PATCH v4 6/6] nbd: forbid use of frozen bitmaps, (continued)