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[Qemu-block] [PATCH v2 1/3] blockdev: reduce aio_context locked sections
From: |
John Snow |
Subject: |
[Qemu-block] [PATCH v2 1/3] blockdev: reduce aio_context locked sections in bitmap add/remove |
Date: |
Mon, 1 Jul 2019 16:13:28 -0400 |
From: Vladimir Sementsov-Ogievskiy <address@hidden>
Commit 0a6c86d024c52 returned these locks back to add/remove
functionality, to protect from intersection of persistent bitmap
related IO with other IO. But other bitmap-related functions called
here are unrelated to the problem, and there are no needs to keep these
calls inside critical sections.
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Reviewed-by: John Snow <address@hidden>
Signed-off-by: John Snow <address@hidden>
---
blockdev.c | 30 +++++++++++++-----------------
1 file changed, 13 insertions(+), 17 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 4d141e9a1f..01248252ca 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2811,7 +2811,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const
char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
- AioContext *aio_context = NULL;
if (!name || name[0] == '\0') {
error_setg(errp, "Bitmap name cannot be empty");
@@ -2847,16 +2846,20 @@ void qmp_block_dirty_bitmap_add(const char *node, const
char *name,
}
if (persistent) {
- aio_context = bdrv_get_aio_context(bs);
+ AioContext *aio_context = bdrv_get_aio_context(bs);
+ bool ok;
+
aio_context_acquire(aio_context);
- if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) {
- goto out;
+ ok = bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp);
+ aio_context_release(aio_context);
+ if (!ok) {
+ return;
}
}
bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
if (bitmap == NULL) {
- goto out;
+ return;
}
if (disabled) {
@@ -2864,10 +2867,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const
char *name,
}
bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
- out:
- if (aio_context) {
- aio_context_release(aio_context);
- }
}
void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
@@ -2875,8 +2874,6 @@ void qmp_block_dirty_bitmap_remove(const char *node,
const char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
- Error *local_err = NULL;
- AioContext *aio_context = NULL;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
@@ -2889,20 +2886,19 @@ void qmp_block_dirty_bitmap_remove(const char *node,
const char *name,
}
if (bdrv_dirty_bitmap_get_persistence(bitmap)) {
- aio_context = bdrv_get_aio_context(bs);
+ AioContext *aio_context = bdrv_get_aio_context(bs);
+ Error *local_err = NULL;
+
aio_context_acquire(aio_context);
bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
+ aio_context_release(aio_context);
if (local_err != NULL) {
error_propagate(errp, local_err);
- goto out;
+ return;
}
}
bdrv_release_dirty_bitmap(bs, bitmap);
- out:
- if (aio_context) {
- aio_context_release(aio_context);
- }
}
/**
--
2.21.0