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330 lines
10 KiB
C
330 lines
10 KiB
C
/*
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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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*/
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#ifndef _SYS_DNODE_H
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#define _SYS_DNODE_H
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#include <sys/zfs_context.h>
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#include <sys/avl.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/refcount.h>
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#include <sys/dmu_zfetch.h>
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#include <sys/zrlock.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* dnode_hold() flags.
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*/
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#define DNODE_MUST_BE_ALLOCATED 1
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#define DNODE_MUST_BE_FREE 2
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/*
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* dnode_next_offset() flags.
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*/
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#define DNODE_FIND_HOLE 1
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#define DNODE_FIND_BACKWARDS 2
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#define DNODE_FIND_HAVELOCK 4
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/*
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* Fixed constants.
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*/
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#define DNODE_SHIFT 9 /* 512 bytes */
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#define DN_MIN_INDBLKSHIFT 10 /* 1k */
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#define DN_MAX_INDBLKSHIFT 14 /* 16k */
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#define DNODE_BLOCK_SHIFT 14 /* 16k */
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#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
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#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
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#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
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/*
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* dnode id flags
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*
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* Note: a file will never ever have its
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* ids moved from bonus->spill
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* and only in a crypto environment would it be on spill
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*/
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#define DN_ID_CHKED_BONUS 0x1
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#define DN_ID_CHKED_SPILL 0x2
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#define DN_ID_OLD_EXIST 0x4
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#define DN_ID_NEW_EXIST 0x8
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/*
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* Derived constants.
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*/
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#define DNODE_SIZE (1 << DNODE_SHIFT)
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#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
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#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
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#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
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#define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1)
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#define DN_KILL_SPILLBLK (1)
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#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
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#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
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#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
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#define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT)
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/* The +2 here is a cheesy way to round up */
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#define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
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(DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
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#define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
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(((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
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#define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
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(dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)
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#define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))
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struct dmu_buf_impl;
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struct objset;
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struct zio;
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enum dnode_dirtycontext {
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DN_UNDIRTIED,
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DN_DIRTY_OPEN,
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DN_DIRTY_SYNC
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};
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/* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
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#define DNODE_FLAG_USED_BYTES (1<<0)
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#define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1)
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/* Does dnode have a SA spill blkptr in bonus? */
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#define DNODE_FLAG_SPILL_BLKPTR (1<<2)
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typedef struct dnode_phys {
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uint8_t dn_type; /* dmu_object_type_t */
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uint8_t dn_indblkshift; /* ln2(indirect block size) */
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uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
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uint8_t dn_nblkptr; /* length of dn_blkptr */
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uint8_t dn_bonustype; /* type of data in bonus buffer */
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uint8_t dn_checksum; /* ZIO_CHECKSUM type */
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uint8_t dn_compress; /* ZIO_COMPRESS type */
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uint8_t dn_flags; /* DNODE_FLAG_* */
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uint16_t dn_datablkszsec; /* data block size in 512b sectors */
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uint16_t dn_bonuslen; /* length of dn_bonus */
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uint8_t dn_pad2[4];
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/* accounting is protected by dn_dirty_mtx */
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uint64_t dn_maxblkid; /* largest allocated block ID */
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uint64_t dn_used; /* bytes (or sectors) of disk space */
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uint64_t dn_pad3[4];
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blkptr_t dn_blkptr[1];
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uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
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blkptr_t dn_spill;
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} dnode_phys_t;
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typedef struct dnode {
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/*
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* dn_struct_rwlock protects the structure of the dnode,
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* including the number of levels of indirection (dn_nlevels),
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* dn_maxblkid, and dn_next_*
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*/
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krwlock_t dn_struct_rwlock;
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/* Our link on dn_objset->os_dnodes list; protected by os_lock. */
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list_node_t dn_link;
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/* immutable: */
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struct objset *dn_objset;
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uint64_t dn_object;
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struct dmu_buf_impl *dn_dbuf;
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struct dnode_handle *dn_handle;
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dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */
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/*
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* Copies of stuff in dn_phys. They're valid in the open
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* context (eg. even before the dnode is first synced).
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* Where necessary, these are protected by dn_struct_rwlock.
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*/
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dmu_object_type_t dn_type; /* object type */
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uint16_t dn_bonuslen; /* bonus length */
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uint8_t dn_bonustype; /* bonus type */
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uint8_t dn_nblkptr; /* number of blkptrs (immutable) */
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uint8_t dn_checksum; /* ZIO_CHECKSUM type */
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uint8_t dn_compress; /* ZIO_COMPRESS type */
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uint8_t dn_nlevels;
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uint8_t dn_indblkshift;
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uint8_t dn_datablkshift; /* zero if blksz not power of 2! */
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uint8_t dn_moved; /* Has this dnode been moved? */
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uint16_t dn_datablkszsec; /* in 512b sectors */
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uint32_t dn_datablksz; /* in bytes */
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uint64_t dn_maxblkid;
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uint8_t dn_next_nblkptr[TXG_SIZE];
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uint8_t dn_next_nlevels[TXG_SIZE];
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uint8_t dn_next_indblkshift[TXG_SIZE];
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uint8_t dn_next_bonustype[TXG_SIZE];
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uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */
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uint16_t dn_next_bonuslen[TXG_SIZE];
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uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */
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/* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */
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uint32_t dn_dbufs_count; /* count of dn_dbufs */
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/* protected by os_lock: */
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list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */
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/* protected by dn_mtx: */
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kmutex_t dn_mtx;
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list_t dn_dirty_records[TXG_SIZE];
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avl_tree_t dn_ranges[TXG_SIZE];
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uint64_t dn_allocated_txg;
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uint64_t dn_free_txg;
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uint64_t dn_assigned_txg;
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kcondvar_t dn_notxholds;
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enum dnode_dirtycontext dn_dirtyctx;
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uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */
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/* protected by own devices */
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refcount_t dn_tx_holds;
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refcount_t dn_holds;
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kmutex_t dn_dbufs_mtx;
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list_t dn_dbufs; /* descendent dbufs */
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/* protected by dn_struct_rwlock */
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struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */
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boolean_t dn_have_spill; /* have spill or are spilling */
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/* parent IO for current sync write */
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zio_t *dn_zio;
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/* used in syncing context */
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uint64_t dn_oldused; /* old phys used bytes */
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uint64_t dn_oldflags; /* old phys dn_flags */
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uint64_t dn_olduid, dn_oldgid;
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uint64_t dn_newuid, dn_newgid;
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int dn_id_flags;
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/* holds prefetch structure */
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struct zfetch dn_zfetch;
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} dnode_t;
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/*
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* Adds a level of indirection between the dbuf and the dnode to avoid
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* iterating descendent dbufs in dnode_move(). Handles are not allocated
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* individually, but as an array of child dnodes in dnode_hold_impl().
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*/
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typedef struct dnode_handle {
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/* Protects dnh_dnode from modification by dnode_move(). */
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zrlock_t dnh_zrlock;
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dnode_t *dnh_dnode;
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} dnode_handle_t;
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typedef struct dnode_children {
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size_t dnc_count; /* number of children */
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dnode_handle_t dnc_children[1]; /* sized dynamically */
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} dnode_children_t;
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typedef struct free_range {
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avl_node_t fr_node;
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uint64_t fr_blkid;
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uint64_t fr_nblks;
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} free_range_t;
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dnode_t *dnode_special_open(struct objset *dd, dnode_phys_t *dnp,
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uint64_t object, dnode_handle_t *dnh);
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void dnode_special_close(dnode_handle_t *dnh);
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void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx);
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void dnode_setbonus_type(dnode_t *dn, dmu_object_type_t, dmu_tx_t *tx);
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void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx);
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int dnode_hold(struct objset *dd, uint64_t object,
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void *ref, dnode_t **dnp);
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int dnode_hold_impl(struct objset *dd, uint64_t object, int flag,
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void *ref, dnode_t **dnp);
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boolean_t dnode_add_ref(dnode_t *dn, void *ref);
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void dnode_rele(dnode_t *dn, void *ref);
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void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx);
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void dnode_sync(dnode_t *dn, dmu_tx_t *tx);
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void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
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dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
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void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize,
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dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
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void dnode_free(dnode_t *dn, dmu_tx_t *tx);
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void dnode_byteswap(dnode_phys_t *dnp);
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void dnode_buf_byteswap(void *buf, size_t size);
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void dnode_verify(dnode_t *dn);
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int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx);
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uint64_t dnode_current_max_length(dnode_t *dn);
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void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx);
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void dnode_clear_range(dnode_t *dn, uint64_t blkid,
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uint64_t nblks, dmu_tx_t *tx);
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void dnode_diduse_space(dnode_t *dn, int64_t space);
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void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx);
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void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t);
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uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid);
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void dnode_init(void);
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void dnode_fini(void);
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int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off,
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int minlvl, uint64_t blkfill, uint64_t txg);
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void dnode_evict_dbufs(dnode_t *dn);
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#ifdef ZFS_DEBUG
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/*
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* There should be a ## between the string literal and fmt, to make it
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* clear that we're joining two strings together, but that piece of shit
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* gcc doesn't support that preprocessor token.
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*/
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#define dprintf_dnode(dn, fmt, ...) do { \
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if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
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char __db_buf[32]; \
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uint64_t __db_obj = (dn)->dn_object; \
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if (__db_obj == DMU_META_DNODE_OBJECT) \
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(void) strcpy(__db_buf, "mdn"); \
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else \
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(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
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(u_longlong_t)__db_obj);\
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dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \
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__db_buf, __VA_ARGS__); \
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} \
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_NOTE(CONSTCOND) } while (0)
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#define DNODE_VERIFY(dn) dnode_verify(dn)
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#define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx)
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#else
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#define dprintf_dnode(db, fmt, ...)
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#define DNODE_VERIFY(dn)
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#define FREE_VERIFY(db, start, end, tx)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DNODE_H */
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