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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* 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.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_DNODE_H
#define _SYS_DNODE_H
#include <sys/zfs_context.h>
#include <sys/avl.h>
#include <sys/spa.h>
#include <sys/txg.h>
#include <sys/zio.h>
#include <sys/refcount.h>
#include <sys/dmu_zfetch.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* dnode_hold() flags.
*/
#define DNODE_MUST_BE_ALLOCATED 1
#define DNODE_MUST_BE_FREE 2
/*
* dnode_next_offset() flags.
*/
#define DNODE_FIND_HOLE 1
#define DNODE_FIND_BACKWARDS 2
#define DNODE_FIND_HAVELOCK 4
/*
* Fixed constants.
*/
#define DNODE_SHIFT 9 /* 512 bytes */
#define DN_MIN_INDBLKSHIFT 10 /* 1k */
#define DN_MAX_INDBLKSHIFT 14 /* 16k */
#define DNODE_BLOCK_SHIFT 14 /* 16k */
#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
/*
* Derived constants.
*/
#define DNODE_SIZE (1 << DNODE_SHIFT)
#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
#define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1)
#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
/* The +2 here is a cheesy way to round up */
#define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
(DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
#define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
(((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
#define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
(dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)
#define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))
struct dmu_buf_impl;
struct objset_impl;
struct zio;
enum dnode_dirtycontext {
DN_UNDIRTIED,
DN_DIRTY_OPEN,
DN_DIRTY_SYNC
};
/* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
#define DNODE_FLAG_USED_BYTES (1<<0)
typedef struct dnode_phys {
uint8_t dn_type; /* dmu_object_type_t */
uint8_t dn_indblkshift; /* ln2(indirect block size) */
uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
uint8_t dn_nblkptr; /* length of dn_blkptr */
uint8_t dn_bonustype; /* type of data in bonus buffer */
uint8_t dn_checksum; /* ZIO_CHECKSUM type */
uint8_t dn_compress; /* ZIO_COMPRESS type */
uint8_t dn_flags; /* DNODE_FLAG_* */
uint16_t dn_datablkszsec; /* data block size in 512b sectors */
uint16_t dn_bonuslen; /* length of dn_bonus */
uint8_t dn_pad2[4];
/* accounting is protected by dn_dirty_mtx */
uint64_t dn_maxblkid; /* largest allocated block ID */
uint64_t dn_used; /* bytes (or sectors) of disk space */
uint64_t dn_pad3[4];
blkptr_t dn_blkptr[1];
uint8_t dn_bonus[DN_MAX_BONUSLEN];
} dnode_phys_t;
typedef struct dnode {
/*
* dn_struct_rwlock protects the structure of the dnode,
* including the number of levels of indirection (dn_nlevels),
* dn_maxblkid, and dn_next_*
*/
krwlock_t dn_struct_rwlock;
/*
* Our link on dataset's dd_dnodes list.
* Protected by dd_accounting_mtx.
*/
list_node_t dn_link;
/* immutable: */
struct objset_impl *dn_objset;
uint64_t dn_object;
struct dmu_buf_impl *dn_dbuf;
dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */
/*
* Copies of stuff in dn_phys. They're valid in the open
* context (eg. even before the dnode is first synced).
* Where necessary, these are protected by dn_struct_rwlock.
*/
dmu_object_type_t dn_type; /* object type */
uint16_t dn_bonuslen; /* bonus length */
uint8_t dn_bonustype; /* bonus type */
uint8_t dn_nblkptr; /* number of blkptrs (immutable) */
uint8_t dn_checksum; /* ZIO_CHECKSUM type */
uint8_t dn_compress; /* ZIO_COMPRESS type */
uint8_t dn_nlevels;
uint8_t dn_indblkshift;
uint8_t dn_datablkshift; /* zero if blksz not power of 2! */
uint16_t dn_datablkszsec; /* in 512b sectors */
uint32_t dn_datablksz; /* in bytes */
uint64_t dn_maxblkid;
uint8_t dn_next_nlevels[TXG_SIZE];
uint8_t dn_next_indblkshift[TXG_SIZE];
uint16_t dn_next_bonuslen[TXG_SIZE];
uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */
/* protected by os_lock: */
list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */
/* protected by dn_mtx: */
kmutex_t dn_mtx;
list_t dn_dirty_records[TXG_SIZE];
avl_tree_t dn_ranges[TXG_SIZE];
uint64_t dn_allocated_txg;
uint64_t dn_free_txg;
uint64_t dn_assigned_txg;
kcondvar_t dn_notxholds;
enum dnode_dirtycontext dn_dirtyctx;
uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */
/* protected by own devices */
refcount_t dn_tx_holds;
refcount_t dn_holds;
kmutex_t dn_dbufs_mtx;
list_t dn_dbufs; /* linked list of descendent dbuf_t's */
struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */
/* parent IO for current sync write */
zio_t *dn_zio;
/* holds prefetch structure */
struct zfetch dn_zfetch;
} dnode_t;
typedef struct free_range {
avl_node_t fr_node;
uint64_t fr_blkid;
uint64_t fr_nblks;
} free_range_t;
dnode_t *dnode_special_open(struct objset_impl *dd, dnode_phys_t *dnp,
uint64_t object);
void dnode_special_close(dnode_t *dn);
void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx);
int dnode_hold(struct objset_impl *dd, uint64_t object,
void *ref, dnode_t **dnp);
int dnode_hold_impl(struct objset_impl *dd, uint64_t object, int flag,
void *ref, dnode_t **dnp);
boolean_t dnode_add_ref(dnode_t *dn, void *ref);
void dnode_rele(dnode_t *dn, void *ref);
void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx);
void dnode_sync(dnode_t *dn, dmu_tx_t *tx);
void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize,
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
void dnode_free(dnode_t *dn, dmu_tx_t *tx);
void dnode_byteswap(dnode_phys_t *dnp);
void dnode_buf_byteswap(void *buf, size_t size);
void dnode_verify(dnode_t *dn);
int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx);
uint64_t dnode_current_max_length(dnode_t *dn);
void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx);
void dnode_clear_range(dnode_t *dn, uint64_t blkid,
uint64_t nblks, dmu_tx_t *tx);
void dnode_diduse_space(dnode_t *dn, int64_t space);
void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx);
void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t);
uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid);
void dnode_init(void);
void dnode_fini(void);
int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off,
int minlvl, uint64_t blkfill, uint64_t txg);
void dnode_evict_dbufs(dnode_t *dn);
#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 that piece of shit
* gcc doesn't support that preprocessor token.
*/
#define dprintf_dnode(dn, fmt, ...) do { \
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
char __db_buf[32]; \
uint64_t __db_obj = (dn)->dn_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((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \
__db_buf, __VA_ARGS__); \
} \
_NOTE(CONSTCOND) } while (0)
#define DNODE_VERIFY(dn) dnode_verify(dn)
#define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx)
#else
#define dprintf_dnode(db, fmt, ...)
#define DNODE_VERIFY(dn)
#define FREE_VERIFY(db, start, end, tx)
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DNODE_H */
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