dmu: Allow buffer fills to fail

[mirror_zfs.git] / include / sys / dbuf.h

diff --git a/include/sys/dbuf.h b/include/sys/dbuf.h
index a06316362e57394fa265a0671afd331984b35b7d..3808a04cba8011f517437baec1e83b66c3542f27 100644 (file)
--- a/include/sys/dbuf.h
+++ b/include/sys/dbuf.h
@@ -61,22 +61,25 @@ extern "C" {
 /*
  * The simplified state transition diagram for dbufs looks like:
  *
- *             +----> READ ----+
- *             |               |
- *             |               V
- *  (alloc)-->UNCACHED      CACHED-->EVICTING-->(free)
- *             |               ^        ^
- *             |               |        |
- *             +----> FILL ----+        |
- *             |                        |
- *             |                        |
- *             +--------> NOFILL -------+
+ *                  +--> READ --+
+ *                  |           |
+ *                  |           V
+ *  (alloc)-->UNCACHED       CACHED-->EVICTING-->(free)
+ *             ^    |           ^        ^
+ *             |    |           |        |
+ *             |    +--> FILL --+        |
+ *             |    |                    |
+ *             |    |                    |
+ *             |    +------> NOFILL -----+
+ *             |               |
+ *             +---------------+
  *
  * DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
  * to find all dbufs in a range of a dnode and must be less than any other
  * dbuf_states_t (see comment on dn_dbufs in dnode.h).
  */
 typedef enum dbuf_states {
+       DB_MARKER = -2,
        DB_SEARCH = -1,
        DB_UNCACHED,
        DB_FILL,
@@ -375,13 +378,15 @@ dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
     uint64_t blkid, uint64_t *hash_out);
 
 int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
+void dmu_buf_will_clone(dmu_buf_t *db, dmu_tx_t *tx);
 void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
-void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx);
-void dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx);
+void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx, boolean_t canfail);
+boolean_t dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx, boolean_t failed);
 void dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx);
 dbuf_dirty_record_t *dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
 dbuf_dirty_record_t *dbuf_dirty_lightweight(dnode_t *dn, uint64_t blkid,
     dmu_tx_t *tx);
+boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
 arc_buf_t *dbuf_loan_arcbuf(dmu_buf_impl_t *db);
 void dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
     bp_embedded_type_t etype, enum zio_compress comp,