426 lines
11 KiB
C
426 lines
11 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
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*/
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#ifndef _SYS_DBUF_H
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#define _SYS_DBUF_H
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#include <sys/dmu.h>
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#include <sys/spa.h>
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#include <sys/txg.h>
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#include <sys/zio.h>
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#include <sys/arc.h>
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#include <sys/zfs_context.h>
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#include <sys/refcount.h>
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#include <sys/zrlock.h>
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#include <sys/multilist.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define IN_DMU_SYNC 2
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/*
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* define flags for dbuf_read
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*/
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#define DB_RF_MUST_SUCCEED (1 << 0)
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#define DB_RF_CANFAIL (1 << 1)
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#define DB_RF_HAVESTRUCT (1 << 2)
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#define DB_RF_NOPREFETCH (1 << 3)
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#define DB_RF_NEVERWAIT (1 << 4)
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#define DB_RF_CACHED (1 << 5)
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#define DB_RF_NO_DECRYPT (1 << 6)
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/*
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* The simplified state transition diagram for dbufs looks like:
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*
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* +----> READ ----+
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* | |
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* | V
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* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
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* | ^ ^
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* | | |
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* +----> FILL ----+ |
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* | |
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* | |
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* +--------> NOFILL -------+
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*
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* DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
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* to find all dbufs in a range of a dnode and must be less than any other
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* dbuf_states_t (see comment on dn_dbufs in dnode.h).
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*/
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typedef enum dbuf_states {
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DB_SEARCH = -1,
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DB_UNCACHED,
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DB_FILL,
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DB_NOFILL,
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DB_READ,
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DB_CACHED,
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DB_EVICTING
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} dbuf_states_t;
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typedef enum dbuf_cached_state {
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DB_NO_CACHE = -1,
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DB_DBUF_CACHE,
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DB_DBUF_METADATA_CACHE,
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DB_CACHE_MAX
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} dbuf_cached_state_t;
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struct dnode;
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struct dmu_tx;
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/*
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* level = 0 means the user data
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* level = 1 means the single indirect block
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* etc.
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*/
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struct dmu_buf_impl;
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typedef enum override_states {
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DR_NOT_OVERRIDDEN,
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DR_IN_DMU_SYNC,
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DR_OVERRIDDEN
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} override_states_t;
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typedef struct dbuf_dirty_record {
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/* link on our parents dirty list */
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list_node_t dr_dirty_node;
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/* transaction group this data will sync in */
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uint64_t dr_txg;
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/* zio of outstanding write IO */
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zio_t *dr_zio;
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/* pointer back to our dbuf */
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struct dmu_buf_impl *dr_dbuf;
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/* pointer to next dirty record */
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struct dbuf_dirty_record *dr_next;
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/* pointer to parent dirty record */
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struct dbuf_dirty_record *dr_parent;
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/* How much space was changed to dsl_pool_dirty_space() for this? */
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unsigned int dr_accounted;
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/* A copy of the bp that points to us */
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blkptr_t dr_bp_copy;
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union dirty_types {
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struct dirty_indirect {
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/* protect access to list */
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kmutex_t dr_mtx;
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/* Our list of dirty children */
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list_t dr_children;
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} di;
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struct dirty_leaf {
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/*
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* dr_data is set when we dirty the buffer
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* so that we can retain the pointer even if it
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* gets COW'd in a subsequent transaction group.
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*/
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arc_buf_t *dr_data;
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blkptr_t dr_overridden_by;
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override_states_t dr_override_state;
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uint8_t dr_copies;
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boolean_t dr_nopwrite;
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boolean_t dr_has_raw_params;
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/*
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* If dr_has_raw_params is set, the following crypt
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* params will be set on the BP that's written.
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*/
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boolean_t dr_byteorder;
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uint8_t dr_salt[ZIO_DATA_SALT_LEN];
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uint8_t dr_iv[ZIO_DATA_IV_LEN];
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uint8_t dr_mac[ZIO_DATA_MAC_LEN];
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} dl;
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} dt;
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} dbuf_dirty_record_t;
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typedef struct dmu_buf_impl {
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/*
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* The following members are immutable, with the exception of
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* db.db_data, which is protected by db_mtx.
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*/
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/* the publicly visible structure */
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dmu_buf_t db;
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/* the objset we belong to */
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struct objset *db_objset;
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/*
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* handle to safely access the dnode we belong to (NULL when evicted)
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*/
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struct dnode_handle *db_dnode_handle;
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/*
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* our parent buffer; if the dnode points to us directly,
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* db_parent == db_dnode_handle->dnh_dnode->dn_dbuf
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* only accessed by sync thread ???
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* (NULL when evicted)
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* May change from NULL to non-NULL under the protection of db_mtx
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* (see dbuf_check_blkptr())
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*/
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struct dmu_buf_impl *db_parent;
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/*
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* link for hash table of all dmu_buf_impl_t's
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*/
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struct dmu_buf_impl *db_hash_next;
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/* our block number */
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uint64_t db_blkid;
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/*
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* Pointer to the blkptr_t which points to us. May be NULL if we
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* don't have one yet. (NULL when evicted)
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*/
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blkptr_t *db_blkptr;
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/*
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* Our indirection level. Data buffers have db_level==0.
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* Indirect buffers which point to data buffers have
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* db_level==1. etc. Buffers which contain dnodes have
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* db_level==0, since the dnodes are stored in a file.
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*/
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uint8_t db_level;
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/* db_mtx protects the members below */
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kmutex_t db_mtx;
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/*
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* Current state of the buffer
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*/
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dbuf_states_t db_state;
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/*
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* Refcount accessed by dmu_buf_{hold,rele}.
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* If nonzero, the buffer can't be destroyed.
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* Protected by db_mtx.
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*/
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zfs_refcount_t db_holds;
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/* buffer holding our data */
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arc_buf_t *db_buf;
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kcondvar_t db_changed;
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dbuf_dirty_record_t *db_data_pending;
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/* pointer to most recent dirty record for this buffer */
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dbuf_dirty_record_t *db_last_dirty;
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/*
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* Our link on the owner dnodes's dn_dbufs list.
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* Protected by its dn_dbufs_mtx.
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*/
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avl_node_t db_link;
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/* Link in dbuf_cache or dbuf_metadata_cache */
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multilist_node_t db_cache_link;
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/* Tells us which dbuf cache this dbuf is in, if any */
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dbuf_cached_state_t db_caching_status;
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/* Data which is unique to data (leaf) blocks: */
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/* User callback information. */
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dmu_buf_user_t *db_user;
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/*
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* Evict user data as soon as the dirty and reference
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* counts are equal.
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*/
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uint8_t db_user_immediate_evict;
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/*
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* This block was freed while a read or write was
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* active.
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*/
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uint8_t db_freed_in_flight;
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/*
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* dnode_evict_dbufs() or dnode_evict_bonus() tried to
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* evict this dbuf, but couldn't due to outstanding
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* references. Evict once the refcount drops to 0.
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*/
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uint8_t db_pending_evict;
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uint8_t db_dirtycnt;
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} dmu_buf_impl_t;
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/* Note: the dbuf hash table is exposed only for the mdb module */
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#define DBUF_MUTEXES 8192
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#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
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typedef struct dbuf_hash_table {
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uint64_t hash_table_mask;
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dmu_buf_impl_t **hash_table;
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kmutex_t hash_mutexes[DBUF_MUTEXES];
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} dbuf_hash_table_t;
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uint64_t dbuf_whichblock(const struct dnode *di, const int64_t level,
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const uint64_t offset);
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void dbuf_create_bonus(struct dnode *dn);
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int dbuf_spill_set_blksz(dmu_buf_t *db, uint64_t blksz, dmu_tx_t *tx);
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void dbuf_rm_spill(struct dnode *dn, dmu_tx_t *tx);
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dmu_buf_impl_t *dbuf_hold(struct dnode *dn, uint64_t blkid, void *tag);
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dmu_buf_impl_t *dbuf_hold_level(struct dnode *dn, int level, uint64_t blkid,
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void *tag);
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int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid,
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boolean_t fail_sparse, boolean_t fail_uncached,
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void *tag, dmu_buf_impl_t **dbp);
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void dbuf_prefetch(struct dnode *dn, int64_t level, uint64_t blkid,
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zio_priority_t prio, arc_flags_t aflags);
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void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
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boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj,
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uint64_t blkid, void *tag);
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uint64_t dbuf_refcount(dmu_buf_impl_t *db);
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void dbuf_rele(dmu_buf_impl_t *db, void *tag);
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void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting);
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dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
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uint64_t blkid);
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int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
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void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
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void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx);
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void dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx);
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void dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx);
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dbuf_dirty_record_t *dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
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arc_buf_t *dbuf_loan_arcbuf(dmu_buf_impl_t *db);
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void dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
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bp_embedded_type_t etype, enum zio_compress comp,
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int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);
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void dbuf_destroy(dmu_buf_impl_t *db);
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void dbuf_unoverride(dbuf_dirty_record_t *dr);
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void dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx);
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void dbuf_release_bp(dmu_buf_impl_t *db);
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boolean_t dbuf_can_remap(const dmu_buf_impl_t *buf);
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void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
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struct dmu_tx *);
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void dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx);
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void dbuf_stats_init(dbuf_hash_table_t *hash);
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void dbuf_stats_destroy(void);
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#define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
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#define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
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#define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))
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#define DB_DNODE_EXIT(_db) (zrl_remove(&DB_DNODE_LOCK(_db)))
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#define DB_DNODE_HELD(_db) (!zrl_is_zero(&DB_DNODE_LOCK(_db)))
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void dbuf_init(void);
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void dbuf_fini(void);
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boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);
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#define DBUF_GET_BUFC_TYPE(_db) \
|
||
|
|
(dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
|
||
|
|
|
||
|
|
#define DBUF_IS_CACHEABLE(_db) \
|
||
|
|
((_db)->db_objset->os_primary_cache == ZFS_CACHE_ALL || \
|
||
|
|
(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)))
|
||
|
|
|
||
|
|
#ifdef ZFS_DEBUG
|
||
|
|
|
||
|
|
/*
|
||
|
|
* There should be a ## between the string literal and fmt, to make it
|
||
|
|
* clear that we're joining two strings together, but gcc does not
|
||
|
|
* support that preprocessor token.
|
||
|
|
*/
|
||
|
|
#define dprintf_dbuf(dbuf, fmt, ...) do { \
|
||
|
|
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
|
||
|
|
char __db_buf[32]; \
|
||
|
|
uint64_t __db_obj = (dbuf)->db.db_object; \
|
||
|
|
if (__db_obj == DMU_META_DNODE_OBJECT) \
|
||
|
|
(void) strcpy(__db_buf, "mdn"); \
|
||
|
|
else \
|
||
|
|
(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
|
||
|
|
(u_longlong_t)__db_obj); \
|
||
|
|
dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
|
||
|
|
"obj=%s lvl=%u blkid=%lld " fmt, \
|
||
|
|
__db_buf, (dbuf)->db_level, \
|
||
|
|
(u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
|
||
|
|
} \
|
||
|
|
_NOTE(CONSTCOND) } while (0)
|
||
|
|
|
||
|
|
#define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
|
||
|
|
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
|
||
|
|
char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
|
||
|
|
snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp); \
|
||
|
|
dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
|
||
|
|
kmem_free(__blkbuf, BP_SPRINTF_LEN); \
|
||
|
|
} \
|
||
|
|
_NOTE(CONSTCOND) } while (0)
|
||
|
|
|
||
|
|
#define DBUF_VERIFY(db) dbuf_verify(db)
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define dprintf_dbuf(db, fmt, ...)
|
||
|
|
#define dprintf_dbuf_bp(db, bp, fmt, ...)
|
||
|
|
#define DBUF_VERIFY(db)
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* _SYS_DBUF_H */
|