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Use cached feature info in spa_add_feature_stats()

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Avoid issuing I/O to the pool when retrieving feature flags information.
Trying to read the ZAPs from disk means that zpool clear would hang if
the pool is suspended and recovery would require a reboot. To keep the
feature stats resident in memory, we hang a cached nvlist off of the
spa.  It is built up from disk the first time spa_add_feature_stats() is
called, and refreshed thereafter using the cached feature reference
counts. spa_add_feature_stats() gets called at pool import time so we
can be sure the cached nvlist will be available if the pool is later
suspended.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3082
This commit is contained in:
Ned Bass
2015-02-26 12:24:11 -08:00
committed by Brian Behlendorf
parent 0e86d309cc
commit 417104bdd3
4 changed files with 51 additions and 11 deletions
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module/zfs/zfeature.c
+1 -1
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@@ -228,7 +228,7 @@ spa_features_check(spa_t *spa, boolean_t for_write,
*
* Note: well-designed features will not need to use this; they should
* use spa_feature_is_enabled() and spa_feature_is_active() instead.
* However, this is non-static for zdb and zhack.
* However, this is non-static for zdb, zhack, and spa_add_feature_stats().
*/
int
feature_get_refcount(spa_t *spa, zfeature_info_t *feature, uint64_t *res)