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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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4
block/qed-cluster.c
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@ -85,6 +85,8 @@ static unsigned int qed_count_contiguous_clusters(BDRVQEDState *s,
*
* On failure QED_CLUSTER_L2 or QED_CLUSTER_L1 is returned for missing L2 or L1
* table offset, respectively. len is number of contiguous unallocated bytes.
*
* Called with table_lock held.
*/
int coroutine_fn qed_find_cluster(BDRVQEDState *s, QEDRequest *request,
uint64_t pos, size_t *len,
@ -112,7 +114,6 @@ int coroutine_fn qed_find_cluster(BDRVQEDState *s, QEDRequest *request,
}
ret = qed_read_l2_table(s, request, l2_offset);
qed_acquire(s);
if (ret) {
goto out;
}
@ -137,6 +138,5 @@ int coroutine_fn qed_find_cluster(BDRVQEDState *s, QEDRequest *request,
out:
*img_offset = offset;
qed_release(s);
return ret;
}