diff options
Diffstat (limited to 'usr/src/uts/common/fs/zfs/dbuf.c')
| -rw-r--r-- | usr/src/uts/common/fs/zfs/dbuf.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/usr/src/uts/common/fs/zfs/dbuf.c b/usr/src/uts/common/fs/zfs/dbuf.c index 437e0ac85c..e8bf55c321 100644 --- a/usr/src/uts/common/fs/zfs/dbuf.c +++ b/usr/src/uts/common/fs/zfs/dbuf.c @@ -2089,7 +2089,24 @@ dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) dbuf_evict(db); } else { VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); - if (!DBUF_IS_CACHEABLE(db)) + + /* + * A dbuf will be eligible for eviction if either the + * 'primarycache' property is set or a duplicate + * copy of this buffer is already cached in the arc. + * + * In the case of the 'primarycache' a buffer + * is considered for eviction if it matches the + * criteria set in the property. + * + * To decide if our buffer is considered a + * duplicate, we must call into the arc to determine + * if multiple buffers are referencing the same + * block on-disk. If so, then we simply evict + * ourselves. + */ + if (!DBUF_IS_CACHEABLE(db) || + arc_buf_eviction_needed(db->db_buf)) dbuf_clear(db); else mutex_exit(&db->db_mtx); |