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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-l2-cache.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-l2-cache.c')
| -rw-r--r-- | block/qed-l2-cache.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/block/qed-l2-cache.c b/block/qed-l2-cache.c index 5cba794650..b548362398 100644 --- a/block/qed-l2-cache.c +++ b/block/qed-l2-cache.c @@ -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) { |