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Diffstat (limited to 'include/sys/dnode.h')
| -rw-r--r-- | include/sys/dnode.h | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/include/sys/dnode.h b/include/sys/dnode.h new file mode 100644 index 000000000..9ad4be36b --- /dev/null +++ b/include/sys/dnode.h @@ -0,0 +1,329 @@ +/* + * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + */ + +#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> +#include <sys/zrlock.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 */ + +/* + * dnode id flags + * + * Note: a file will never ever have its + * ids moved from bonus->spill + * and only in a crypto environment would it be on spill + */ +#define DN_ID_CHKED_BONUS 0x1 +#define DN_ID_CHKED_SPILL 0x2 +#define DN_ID_OLD_EXIST 0x4 +#define DN_ID_NEW_EXIST 0x8 + +/* + * 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 DN_KILL_SPILLBLK (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) +#define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT) + +/* 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; +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) +#define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1) + +/* Does dnode have a SA spill blkptr in bonus? */ +#define DNODE_FLAG_SPILL_BLKPTR (1<<2) + +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 - sizeof (blkptr_t)]; + blkptr_t dn_spill; +} 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 dn_objset->os_dnodes list; protected by os_lock. */ + list_node_t dn_link; + + /* immutable: */ + struct objset *dn_objset; + uint64_t dn_object; + struct dmu_buf_impl *dn_dbuf; + struct dnode_handle *dn_handle; + 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! */ + uint8_t dn_moved; /* Has this dnode been moved? */ + uint16_t dn_datablkszsec; /* in 512b sectors */ + uint32_t dn_datablksz; /* in bytes */ + uint64_t dn_maxblkid; + uint8_t dn_next_nblkptr[TXG_SIZE]; + uint8_t dn_next_nlevels[TXG_SIZE]; + uint8_t dn_next_indblkshift[TXG_SIZE]; + uint8_t dn_next_bonustype[TXG_SIZE]; + uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */ + uint16_t dn_next_bonuslen[TXG_SIZE]; + uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */ + + /* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */ + uint32_t dn_dbufs_count; /* count of dn_dbufs */ + + /* 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; /* descendent dbufs */ + + /* protected by dn_struct_rwlock */ + struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */ + + boolean_t dn_have_spill; /* have spill or are spilling */ + + /* parent IO for current sync write */ + zio_t *dn_zio; + + /* used in syncing context */ + uint64_t dn_oldused; /* old phys used bytes */ + uint64_t dn_oldflags; /* old phys dn_flags */ + uint64_t dn_olduid, dn_oldgid; + uint64_t dn_newuid, dn_newgid; + int dn_id_flags; + + /* holds prefetch structure */ + struct zfetch dn_zfetch; +} dnode_t; + +/* + * Adds a level of indirection between the dbuf and the dnode to avoid + * iterating descendent dbufs in dnode_move(). Handles are not allocated + * individually, but as an array of child dnodes in dnode_hold_impl(). + */ +typedef struct dnode_handle { + /* Protects dnh_dnode from modification by dnode_move(). */ + zrlock_t dnh_zrlock; + dnode_t *dnh_dnode; +} dnode_handle_t; + +typedef struct dnode_children { + size_t dnc_count; /* number of children */ + dnode_handle_t dnc_children[1]; /* sized dynamically */ +} dnode_children_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 *dd, dnode_phys_t *dnp, + uint64_t object, dnode_handle_t *dnh); +void dnode_special_close(dnode_handle_t *dnh); + +void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx); +void dnode_setbonus_type(dnode_t *dn, dmu_object_type_t, dmu_tx_t *tx); +void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx); + +int dnode_hold(struct objset *dd, uint64_t object, + void *ref, dnode_t **dnp); +int dnode_hold_impl(struct objset *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 */ |