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qed: protect table cache with CoMutex

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This makes the driver thread-safe.  The CoMutex is dropped temporarily
while accessing the data clusters or the backing file.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170629132749.997-10-pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-06-29 15:27:47 +02:00 • committed by Fam Zheng
parent 61c7887e0f
commit 1f01e50b83
5 changed files with 129 additions and 54 deletions
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6
block/qed-l2-cache.c
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@ -101,6 +101,8 @@ CachedL2Table *qed_alloc_l2_cache_entry(L2TableCache *l2_cache)
/**
* Decrease an entry's reference count and free if necessary when the reference
* count drops to zero.
*
* Called with table_lock held.
*/
void qed_unref_l2_cache_entry(CachedL2Table *entry)
{
@ -122,6 +124,8 @@ void qed_unref_l2_cache_entry(CachedL2Table *entry)
*
* For a cached entry, this function increases the reference count and returns
* the entry.
*
* Called with table_lock held.
*/
CachedL2Table *qed_find_l2_cache_entry(L2TableCache *l2_cache, uint64_t offset)
{
@ -150,6 +154,8 @@ CachedL2Table *qed_find_l2_cache_entry(L2TableCache *l2_cache, uint64_t offset)
* N.B. This function steals a reference to the l2_table from the caller so the
* caller must obtain a new reference by issuing a call to
* qed_find_l2_cache_entry().
*
* Called with table_lock held.
*/
void qed_commit_l2_cache_entry(L2TableCache *l2_cache, CachedL2Table *l2_table)
{