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| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-06-29 15:27:47 +0200 |
|---|---|---|
| committer | Fam Zheng <famz@redhat.com> | 2017-07-17 11:34:11 +0800 |
| commit | 1f01e50b8330c24714ddca5841fdbb703076b121 (patch) | |
| tree | ca4573cd50c640d12842de5f0ba8d8814318d67a /block/qed-cluster.c | |
| parent | 61c7887e0f3dcfa9c4ccdfe43374243a4a5c0e8d (diff) | |
| download | qemu-1f01e50b8330c24714ddca5841fdbb703076b121.tar.gz | |
qed: protect table cache with CoMutex
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>
Diffstat (limited to 'block/qed-cluster.c')
| -rw-r--r-- | block/qed-cluster.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/qed-cluster.c b/block/qed-cluster.c index d8d6e66a0f..672e2e654b 100644 --- a/block/qed-cluster.c +++ b/block/qed-cluster.c @@ -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; } |