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Convert dbuf dirty record record list to a list_t

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Additionally pull in state machine comments about
upcoming async cow work.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #9902
This commit is contained in:
Matthew Macy
2020-02-05 11:07:19 -08:00
committed by GitHub
parent 741db5a346
commit cccbed9f98
6 changed files with 103 additions and 91 deletions
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include/sys/dbuf.h
+27 -4
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@@ -127,8 +127,8 @@ typedef struct dbuf_dirty_record {
/* pointer back to our dbuf */
struct dmu_buf_impl *dr_dbuf;
/* pointer to next dirty record */
struct dbuf_dirty_record *dr_next;
/* list link for dbuf dirty records */
list_node_t dr_dbuf_node;
/* pointer to parent dirty record */
struct dbuf_dirty_record *dr_parent;
@@ -257,8 +257,8 @@ typedef struct dmu_buf_impl {
kcondvar_t db_changed;
dbuf_dirty_record_t *db_data_pending;
/* pointer to most recent dirty record for this buffer */
dbuf_dirty_record_t *db_last_dirty;
/* List of dirty records for the buffer sorted newest to oldest. */
list_t db_dirty_records;
/*
* Our link on the owner dnodes's dn_dbufs list.
@@ -379,6 +379,29 @@ void dbuf_fini(void);
boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);
static inline dbuf_dirty_record_t *
dbuf_find_dirty_lte(dmu_buf_impl_t *db, uint64_t txg)
{
dbuf_dirty_record_t *dr;
for (dr = list_head(&db->db_dirty_records);
dr != NULL && dr->dr_txg > txg;
dr = list_next(&db->db_dirty_records, dr))
continue;
return (dr);
}
static inline dbuf_dirty_record_t *
dbuf_find_dirty_eq(dmu_buf_impl_t *db, uint64_t txg)
{
dbuf_dirty_record_t *dr;
dr = dbuf_find_dirty_lte(db, txg);
if (dr && dr->dr_txg == txg)
return (dr);
return (NULL);
}
#define DBUF_GET_BUFC_TYPE(_db) \
(dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)