* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
+ * or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
*/
#include <sys/zio.h>
#include <sys/arc.h>
#include <sys/zfs_context.h>
-#include <sys/refcount.h>
+#include <sys/zfs_refcount.h>
#include <sys/zrlock.h>
#include <sys/multilist.h>
#define DB_RF_NEVERWAIT (1 << 4)
#define DB_RF_CACHED (1 << 5)
#define DB_RF_NO_DECRYPT (1 << 6)
+#define DB_RF_PARTIAL_FIRST (1 << 7)
+#define DB_RF_PARTIAL_MORE (1 << 8)
/*
* 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,
DR_OVERRIDDEN
} override_states_t;
+typedef enum db_lock_type {
+ DLT_NONE,
+ DLT_PARENT,
+ DLT_OBJSET
+} db_lock_type_t;
+
typedef struct dbuf_dirty_record {
/* link on our parents dirty list */
list_node_t dr_dirty_node;
/* 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;
+
+ /*
+ * The dnode we are part of. Note that the dnode can not be moved or
+ * evicted due to the hold that's added by dnode_setdirty() or
+ * dmu_objset_sync_dnodes(), and released by dnode_rele_task() or
+ * userquota_updates_task(). This hold is necessary for
+ * dirty_lightweight_leaf-type dirty records, which don't have a hold
+ * on a dbuf.
+ */
+ dnode_t *dr_dnode;
/* pointer to parent dirty record */
struct dbuf_dirty_record *dr_parent;
override_states_t dr_override_state;
uint8_t dr_copies;
boolean_t dr_nopwrite;
+ boolean_t dr_brtwrite;
boolean_t dr_has_raw_params;
/*
uint8_t dr_iv[ZIO_DATA_IV_LEN];
uint8_t dr_mac[ZIO_DATA_MAC_LEN];
} dl;
+ struct dirty_lightweight_leaf {
+ /*
+ * This dirty record refers to a leaf (level=0)
+ * block, whose dbuf has not been instantiated for
+ * performance reasons.
+ */
+ uint64_t dr_blkid;
+ abd_t *dr_abd;
+ zio_prop_t dr_props;
+ zio_flag_t dr_flags;
+ } dll;
} dt;
} dbuf_dirty_record_t;
*/
struct dmu_buf_impl *db_hash_next;
+ /*
+ * Our link on the owner dnodes's dn_dbufs list.
+ * Protected by its dn_dbufs_mtx. Should be on the same cache line
+ * as db_level and db_blkid for the best avl_add() performance.
+ */
+ avl_node_t db_link;
+
/* our block number */
uint64_t db_blkid;
*/
uint8_t db_level;
+ /*
+ * Protects db_buf's contents if they contain an indirect block or data
+ * block of the meta-dnode. We use this lock to protect the structure of
+ * the block tree. This means that when modifying this dbuf's data, we
+ * grab its rwlock. When modifying its parent's data (including the
+ * blkptr to this dbuf), we grab the parent's rwlock. The lock ordering
+ * for this lock is:
+ * 1) dn_struct_rwlock
+ * 2) db_rwlock
+ * We don't currently grab multiple dbufs' db_rwlocks at once.
+ */
+ krwlock_t db_rwlock;
+
+ /* buffer holding our data */
+ arc_buf_t *db_buf;
+
/* db_mtx protects the members below */
kmutex_t db_mtx;
* If nonzero, the buffer can't be destroyed.
* Protected by db_mtx.
*/
- refcount_t db_holds;
-
- /* buffer holding our data */
- arc_buf_t *db_buf;
+ zfs_refcount_t db_holds;
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;
-
- /*
- * Our link on the owner dnodes's dn_dbufs list.
- * Protected by its dn_dbufs_mtx.
- */
- avl_node_t db_link;
+ /* List of dirty records for the buffer sorted newest to oldest. */
+ list_t db_dirty_records;
/* Link in dbuf_cache or dbuf_metadata_cache */
multilist_node_t db_cache_link;
/* Tells us which dbuf cache this dbuf is in, if any */
dbuf_cached_state_t db_caching_status;
+ uint64_t db_hash;
+
/* Data which is unique to data (leaf) blocks: */
/* User callback information. */
uint8_t db_pending_evict;
uint8_t db_dirtycnt;
+
+ /* The buffer was partially read. More reads may follow. */
+ uint8_t db_partial_read;
} dmu_buf_impl_t;
-/* Note: the dbuf hash table is exposed only for the mdb module */
-#define DBUF_MUTEXES 8192
-#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
+#define DBUF_HASH_MUTEX(h, idx) \
+ (&(h)->hash_mutexes[(idx) & ((h)->hash_mutex_mask)])
+
typedef struct dbuf_hash_table {
uint64_t hash_table_mask;
+ uint64_t hash_mutex_mask;
dmu_buf_impl_t **hash_table;
- kmutex_t hash_mutexes[DBUF_MUTEXES];
+ kmutex_t *hash_mutexes;
} dbuf_hash_table_t;
+typedef void (*dbuf_prefetch_fn)(void *, uint64_t, uint64_t, boolean_t);
+
uint64_t dbuf_whichblock(const struct dnode *di, const int64_t level,
const uint64_t offset);
void dbuf_rm_spill(struct dnode *dn, dmu_tx_t *tx);
-dmu_buf_impl_t *dbuf_hold(struct dnode *dn, uint64_t blkid, void *tag);
+dmu_buf_impl_t *dbuf_hold(struct dnode *dn, uint64_t blkid, const void *tag);
dmu_buf_impl_t *dbuf_hold_level(struct dnode *dn, int level, uint64_t blkid,
- void *tag);
+ const void *tag);
int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid,
boolean_t fail_sparse, boolean_t fail_uncached,
- void *tag, dmu_buf_impl_t **dbp);
+ const void *tag, dmu_buf_impl_t **dbp);
-void dbuf_prefetch(struct dnode *dn, int64_t level, uint64_t blkid,
+int dbuf_prefetch_impl(struct dnode *dn, int64_t level, uint64_t blkid,
+ zio_priority_t prio, arc_flags_t aflags, dbuf_prefetch_fn cb,
+ void *arg);
+int dbuf_prefetch(struct dnode *dn, int64_t level, uint64_t blkid,
zio_priority_t prio, arc_flags_t aflags);
-void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
+void dbuf_add_ref(dmu_buf_impl_t *db, const void *tag);
boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj,
- uint64_t blkid, void *tag);
+ uint64_t blkid, const void *tag);
uint64_t dbuf_refcount(dmu_buf_impl_t *db);
-void dbuf_rele(dmu_buf_impl_t *db, void *tag);
-void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag);
+void dbuf_rele(dmu_buf_impl_t *db, const void *tag);
+void dbuf_rele_and_unlock(dmu_buf_impl_t *db, const void *tag,
+ boolean_t evicting);
dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
- uint64_t blkid);
+ 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,
int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);
+int dmu_lightweight_write_by_dnode(dnode_t *dn, uint64_t offset, abd_t *abd,
+ const struct zio_prop *zp, zio_flag_t flags, dmu_tx_t *tx);
+
+void dmu_buf_redact(dmu_buf_t *dbuf, dmu_tx_t *tx);
void dbuf_destroy(dmu_buf_impl_t *db);
void dbuf_unoverride(dbuf_dirty_record_t *dr);
void dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx);
void dbuf_release_bp(dmu_buf_impl_t *db);
-
-boolean_t dbuf_can_remap(const dmu_buf_impl_t *buf);
+db_lock_type_t dmu_buf_lock_parent(dmu_buf_impl_t *db, krw_t rw,
+ const void *tag);
+void dmu_buf_unlock_parent(dmu_buf_impl_t *db, db_lock_type_t type,
+ const void *tag);
void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
struct dmu_tx *);
void dbuf_stats_init(dbuf_hash_table_t *hash);
void dbuf_stats_destroy(void);
+int dbuf_dnode_findbp(dnode_t *dn, uint64_t level, uint64_t blkid,
+ blkptr_t *bp, uint16_t *datablkszsec, uint8_t *indblkshift);
+
#define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
#define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
#define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))
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)
(dbuf_is_metadata(_db) && \
((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))
-#define DBUF_IS_L2CACHEABLE(_db) \
- ((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL || \
- (dbuf_is_metadata(_db) && \
- ((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
-
-#define DNODE_LEVEL_IS_L2CACHEABLE(_dn, _level) \
- ((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_ALL || \
- (((_level) > 0 || \
- DMU_OT_IS_METADATA((_dn)->dn_handle->dnh_dnode->dn_type)) && \
- ((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
+boolean_t dbuf_is_l2cacheable(dmu_buf_impl_t *db);
#ifdef ZFS_DEBUG
char __db_buf[32]; \
uint64_t __db_obj = (dbuf)->db.db_object; \
if (__db_obj == DMU_META_DNODE_OBJECT) \
- (void) strcpy(__db_buf, "mdn"); \
+ (void) strlcpy(__db_buf, "mdn", sizeof (__db_buf)); \
else \
(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
(u_longlong_t)__db_obj); \
__db_buf, (dbuf)->db_level, \
(u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
} \
-_NOTE(CONSTCOND) } while (0)
+} while (0)
#define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
kmem_free(__blkbuf, BP_SPRINTF_LEN); \
} \
-_NOTE(CONSTCOND) } while (0)
+} while (0)
#define DBUF_VERIFY(db) dbuf_verify(db)
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