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Add ddt_object_count() error handling

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The interface for the ddt_zap_count() function assumes it can
never fail.  However, internally ddt_zap_count() is implemented
with zap_count() which can potentially fail.  Now because there
was no way to return the error to the caller a VERIFY was used
to ensure this case never happens.

Unfortunately, it has been observed that pools can be damaged in
such a way that zap_count() fails.  The result is that the pool can
not be imported without hitting the VERIFY and crashing the system.

This patch reworks ddt_object_count() so the error can be safely
caught and returned to the caller.  This allows a pool which has
be damaged in this way to be safely rewound for import.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #910
This commit is contained in:
Brian Behlendorf
2012-10-26 10:01:49 -07:00
parent 178e73b376
commit e8fd45a0f9
4 changed files with 28 additions and 19 deletions
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cmd/zdb/zdb.c
+3 -1
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@@ -698,7 +698,9 @@ dump_ddt(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
return;
ASSERT(error == 0);
if ((count = ddt_object_count(ddt, type, class)) == 0)
error = ddt_object_count(ddt, type, class, &count);
ASSERT(error == 0);
if (count == 0)
return;
dspace = doi.doi_physical_blocks_512 << 9;