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Fix race in dnode_check_slots_free()

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Currently, dnode_check_slots_free() works by checking dn->dn_type
in the dnode to determine if the dnode is reclaimable. However,
there is a small window of time between dnode_free_sync() in the
first call to dsl_dataset_sync() and when the useraccounting code
is run when the type is set DMU_OT_NONE, but the dnode is not yet
evictable, leading to crashes. This patch adds the ability for
dnodes to track which txg they were last dirtied in and adds a
check for this before performing the reclaim.

This patch also corrects several instances when dn_dirty_link was
treated as a list_node_t when it is technically a multilist_node_t.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7147 
Closes #7388
This commit is contained in:
Tom Caputi
2018-04-10 14:15:05 -04:00
committed by Brian Behlendorf
parent 10f88c5cd5
commit edc1e713c2
6 changed files with 43 additions and 11 deletions
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module/zfs/dmu.c
+1 -1
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@@ -2284,7 +2284,7 @@ dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
* Check if dnode is dirty
*/
for (i = 0; i < TXG_SIZE; i++) {
if (list_link_active(&dn->dn_dirty_link[i])) {
if (multilist_link_active(&dn->dn_dirty_link[i])) {
clean = B_FALSE;
break;
}