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Serialize access to spa->spa_feat_stats nvlist

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The function spa_add_feature_stats() manipulates the shared nvlist
spa->spa_feat_stats in an unsafe concurrent manner. Add a mutex to
protect the list.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3335
This commit is contained in:
Ned Bass
2015-04-23 12:32:59 -07:00
committed by Brian Behlendorf
parent 7008109646
commit 4eb30c6864
3 changed files with 9 additions and 1 deletions
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include/sys/spa_impl.h
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@@ -236,6 +236,7 @@ struct spa {
uint64_t spa_feat_for_read_obj; /* required to read from pool */
uint64_t spa_feat_desc_obj; /* Feature descriptions */
uint64_t spa_feat_enabled_txg_obj; /* Feature enabled txg */
kmutex_t spa_feat_stats_lock; /* protects spa_feat_stats */
nvlist_t *spa_feat_stats; /* Cache of enabled features */
/* cache feature refcounts */
uint64_t spa_feat_refcount_cache[SPA_FEATURES];