1*fa9e4066Sahrens /* 2*fa9e4066Sahrens * CDDL HEADER START 3*fa9e4066Sahrens * 4*fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6*fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7*fa9e4066Sahrens * with the License. 8*fa9e4066Sahrens * 9*fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11*fa9e4066Sahrens * See the License for the specific language governing permissions 12*fa9e4066Sahrens * and limitations under the License. 13*fa9e4066Sahrens * 14*fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15*fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17*fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18*fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19*fa9e4066Sahrens * 20*fa9e4066Sahrens * CDDL HEADER END 21*fa9e4066Sahrens */ 22*fa9e4066Sahrens /* 23*fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*fa9e4066Sahrens * Use is subject to license terms. 25*fa9e4066Sahrens */ 26*fa9e4066Sahrens 27*fa9e4066Sahrens #ifndef _SYS_DNODE_H 28*fa9e4066Sahrens #define _SYS_DNODE_H 29*fa9e4066Sahrens 30*fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 31*fa9e4066Sahrens 32*fa9e4066Sahrens #include <sys/zfs_context.h> 33*fa9e4066Sahrens #include <sys/avl.h> 34*fa9e4066Sahrens #include <sys/spa.h> 35*fa9e4066Sahrens #include <sys/txg.h> 36*fa9e4066Sahrens #include <sys/refcount.h> 37*fa9e4066Sahrens #include <sys/dmu_zfetch.h> 38*fa9e4066Sahrens 39*fa9e4066Sahrens #ifdef __cplusplus 40*fa9e4066Sahrens extern "C" { 41*fa9e4066Sahrens #endif 42*fa9e4066Sahrens 43*fa9e4066Sahrens /* 44*fa9e4066Sahrens * Flags. 45*fa9e4066Sahrens */ 46*fa9e4066Sahrens #define DNODE_MUST_BE_ALLOCATED 1 47*fa9e4066Sahrens #define DNODE_MUST_BE_FREE 2 48*fa9e4066Sahrens 49*fa9e4066Sahrens /* 50*fa9e4066Sahrens * Fixed constants. 51*fa9e4066Sahrens */ 52*fa9e4066Sahrens #define DNODE_SHIFT 9 /* 512 bytes */ 53*fa9e4066Sahrens #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 54*fa9e4066Sahrens #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 55*fa9e4066Sahrens #define DNODE_BLOCK_SHIFT 14 /* 16k */ 56*fa9e4066Sahrens #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 57*fa9e4066Sahrens #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 58*fa9e4066Sahrens #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 59*fa9e4066Sahrens 60*fa9e4066Sahrens /* 61*fa9e4066Sahrens * Derived constants. 62*fa9e4066Sahrens */ 63*fa9e4066Sahrens #define DNODE_SIZE (1 << DNODE_SHIFT) 64*fa9e4066Sahrens #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 65*fa9e4066Sahrens #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 66*fa9e4066Sahrens 67*fa9e4066Sahrens #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 68*fa9e4066Sahrens #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 69*fa9e4066Sahrens #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 70*fa9e4066Sahrens 71*fa9e4066Sahrens #define DN_META_DNODE_LEVELS \ 72*fa9e4066Sahrens (1 + (DN_MAX_OBJECT_SHIFT - DNODE_SHIFT + SPA_BLKPTRSHIFT - \ 73*fa9e4066Sahrens DNODES_PER_BLOCK_SHIFT) / DNODES_PER_LEVEL_SHIFT) 74*fa9e4066Sahrens 75*fa9e4066Sahrens /* The +2 here is a cheesy way to round up */ 76*fa9e4066Sahrens #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \ 77*fa9e4066Sahrens (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT))) 78*fa9e4066Sahrens 79*fa9e4066Sahrens #define DN_MAX_OBJECT \ 80*fa9e4066Sahrens ((uint64_t)DN_MAX_NBLKPTR << (DNODES_PER_BLOCK_SHIFT + \ 81*fa9e4066Sahrens (DN_META_DNODE_LEVELS - 1) * DNODES_PER_LEVEL_SHIFT)) 82*fa9e4066Sahrens 83*fa9e4066Sahrens #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 84*fa9e4066Sahrens (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 85*fa9e4066Sahrens 86*fa9e4066Sahrens #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift)) 87*fa9e4066Sahrens 88*fa9e4066Sahrens struct dmu_buf_impl; 89*fa9e4066Sahrens struct objset_impl; 90*fa9e4066Sahrens struct zio; 91*fa9e4066Sahrens 92*fa9e4066Sahrens enum dnode_dirtycontext { 93*fa9e4066Sahrens DN_UNDIRTIED, 94*fa9e4066Sahrens DN_DIRTY_OPEN, 95*fa9e4066Sahrens DN_DIRTY_SYNC 96*fa9e4066Sahrens }; 97*fa9e4066Sahrens 98*fa9e4066Sahrens typedef struct dnode_phys { 99*fa9e4066Sahrens uint8_t dn_type; /* dmu_object_type_t */ 100*fa9e4066Sahrens uint8_t dn_indblkshift; /* ln2(indirect block size) */ 101*fa9e4066Sahrens uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 102*fa9e4066Sahrens uint8_t dn_nblkptr; /* length of dn_blkptr */ 103*fa9e4066Sahrens uint8_t dn_bonustype; /* type of data in bonus buffer */ 104*fa9e4066Sahrens uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 105*fa9e4066Sahrens uint8_t dn_compress; /* ZIO_COMPRESS type */ 106*fa9e4066Sahrens uint8_t dn_pad1[1]; 107*fa9e4066Sahrens uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 108*fa9e4066Sahrens uint16_t dn_bonuslen; /* length of dn_bonus */ 109*fa9e4066Sahrens uint8_t dn_pad2[4]; 110*fa9e4066Sahrens 111*fa9e4066Sahrens /* accounting is protected by dn_dirty_mtx */ 112*fa9e4066Sahrens uint64_t dn_maxblkid; /* largest allocated block ID */ 113*fa9e4066Sahrens uint64_t dn_secphys; /* 512b sectors of disk space used */ 114*fa9e4066Sahrens 115*fa9e4066Sahrens uint64_t dn_pad3[4]; 116*fa9e4066Sahrens 117*fa9e4066Sahrens blkptr_t dn_blkptr[1]; 118*fa9e4066Sahrens uint8_t dn_bonus[DN_MAX_BONUSLEN]; 119*fa9e4066Sahrens } dnode_phys_t; 120*fa9e4066Sahrens 121*fa9e4066Sahrens typedef struct dnode { 122*fa9e4066Sahrens /* 123*fa9e4066Sahrens * lock ordering: 124*fa9e4066Sahrens * 125*fa9e4066Sahrens * db_mtx > dn_dirty_mtx 126*fa9e4066Sahrens * dbuf_syncdone 127*fa9e4066Sahrens * 128*fa9e4066Sahrens * dn_struct_rwlock/r > dn_dirty_mtx 129*fa9e4066Sahrens * dmu_object_info 130*fa9e4066Sahrens * 131*fa9e4066Sahrens * dn_struct_rwlock/r > db_mtx > dn_dirty_mtx 132*fa9e4066Sahrens * dbuf_dirty 133*fa9e4066Sahrens * dbuf_setdirty 134*fa9e4066Sahrens * 135*fa9e4066Sahrens * dn_struct_rwlock/w > db_mtx > dn_mtx 136*fa9e4066Sahrens * dnode_increase_indirection -> dbuf_find 137*fa9e4066Sahrens * dbuf_hold_impl 138*fa9e4066Sahrens * dnode_set_bonus 139*fa9e4066Sahrens * 140*fa9e4066Sahrens * dn_struct_rwlock/w > dn_mtx 141*fa9e4066Sahrens * dnode_increase_indirection 142*fa9e4066Sahrens * 143*fa9e4066Sahrens * dn_dirty_mtx > dn_mtx 144*fa9e4066Sahrens * dnode_buf_pageout 145*fa9e4066Sahrens * 146*fa9e4066Sahrens * db_mtx > dn_mtx 147*fa9e4066Sahrens * dbuf_create 148*fa9e4066Sahrens */ 149*fa9e4066Sahrens 150*fa9e4066Sahrens /* 151*fa9e4066Sahrens * dn_struct_rwlock protects the structure of the dnode. 152*fa9e4066Sahrens * In particular, it protects the number of levels of indirection. 153*fa9e4066Sahrens */ 154*fa9e4066Sahrens krwlock_t dn_struct_rwlock; 155*fa9e4066Sahrens 156*fa9e4066Sahrens /* 157*fa9e4066Sahrens * Our link on dataset's dd_dnodes list. 158*fa9e4066Sahrens * Protected by dd_accounting_mtx. 159*fa9e4066Sahrens */ 160*fa9e4066Sahrens list_node_t dn_link; 161*fa9e4066Sahrens 162*fa9e4066Sahrens /* immutable: */ 163*fa9e4066Sahrens struct objset_impl *dn_objset; 164*fa9e4066Sahrens uint64_t dn_object; 165*fa9e4066Sahrens struct dmu_buf_impl *dn_dbuf; 166*fa9e4066Sahrens dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */ 167*fa9e4066Sahrens 168*fa9e4066Sahrens /* 169*fa9e4066Sahrens * Copies of stuff in dn_phys. They're valid here even before 170*fa9e4066Sahrens * the dnode is first synced. 171*fa9e4066Sahrens */ 172*fa9e4066Sahrens dmu_object_type_t dn_type; /* object type (immutable) */ 173*fa9e4066Sahrens uint8_t dn_bonustype; /* bonus type (immutable) */ 174*fa9e4066Sahrens uint16_t dn_bonuslen; /* bonus length (immutable) */ 175*fa9e4066Sahrens uint8_t dn_nblkptr; /* number of blkptrs (immutable) */ 176*fa9e4066Sahrens uint8_t dn_datablkshift; /* zero if blksz not power of 2! */ 177*fa9e4066Sahrens uint32_t dn_datablksz; /* in bytes */ 178*fa9e4066Sahrens uint16_t dn_datablkszsec; /* in 512b sectors */ 179*fa9e4066Sahrens 180*fa9e4066Sahrens uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 181*fa9e4066Sahrens uint8_t dn_compress; /* ZIO_COMPRESS type */ 182*fa9e4066Sahrens 183*fa9e4066Sahrens /* 184*fa9e4066Sahrens * The following are kept up-to-date in the *open* context, the syncing 185*fa9e4066Sahrens * context should only pay attention to the dn_next_* values. 186*fa9e4066Sahrens */ 187*fa9e4066Sahrens uint8_t dn_nlevels; 188*fa9e4066Sahrens uint8_t dn_indblkshift; 189*fa9e4066Sahrens 190*fa9e4066Sahrens uint8_t dn_next_nlevels[TXG_SIZE]; 191*fa9e4066Sahrens uint8_t dn_next_indblkshift[TXG_SIZE]; 192*fa9e4066Sahrens 193*fa9e4066Sahrens /* protected by os_lock: */ 194*fa9e4066Sahrens uint32_t dn_dirtyblksz[TXG_SIZE]; /* dirty block size in bytes */ 195*fa9e4066Sahrens list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */ 196*fa9e4066Sahrens 197*fa9e4066Sahrens /* protected by dn_mtx: */ 198*fa9e4066Sahrens kmutex_t dn_mtx; 199*fa9e4066Sahrens list_t dn_dirty_dbufs[TXG_SIZE]; 200*fa9e4066Sahrens uint64_t dn_maxblkid; 201*fa9e4066Sahrens avl_tree_t dn_ranges[TXG_SIZE]; 202*fa9e4066Sahrens uint64_t dn_allocated_txg; 203*fa9e4066Sahrens uint64_t dn_free_txg; 204*fa9e4066Sahrens uint64_t dn_assigned_txg; 205*fa9e4066Sahrens struct dmu_tx *dn_assigned_tx; /* if only one tx cares */ 206*fa9e4066Sahrens kcondvar_t dn_notxholds; 207*fa9e4066Sahrens enum dnode_dirtycontext dn_dirtyctx; 208*fa9e4066Sahrens uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */ 209*fa9e4066Sahrens 210*fa9e4066Sahrens /* protected by own devices */ 211*fa9e4066Sahrens refcount_t dn_tx_holds; 212*fa9e4066Sahrens refcount_t dn_holds; 213*fa9e4066Sahrens 214*fa9e4066Sahrens kmutex_t dn_dbufs_mtx; 215*fa9e4066Sahrens list_t dn_dbufs; /* linked list of descendent dbuf_t's */ 216*fa9e4066Sahrens kcondvar_t dn_evicted; /* a child dbuf has been evicted */ 217*fa9e4066Sahrens 218*fa9e4066Sahrens /* 219*fa9e4066Sahrens * Performance hack: whenever we have a hold on the bonus buffer of a 220*fa9e4066Sahrens * ZAP object, we will also have a hold on db0. This will keep the 221*fa9e4066Sahrens * meta-data for a micro-zap object cached as long as the znode for the 222*fa9e4066Sahrens * object is in the znode cache. 223*fa9e4066Sahrens */ 224*fa9e4066Sahrens struct dmu_buf_impl *dn_db0; 225*fa9e4066Sahrens 226*fa9e4066Sahrens /* holds prefetch structure */ 227*fa9e4066Sahrens struct zfetch dn_zfetch; 228*fa9e4066Sahrens } dnode_t; 229*fa9e4066Sahrens 230*fa9e4066Sahrens typedef struct free_range { 231*fa9e4066Sahrens avl_node_t fr_node; 232*fa9e4066Sahrens uint64_t fr_blkid; 233*fa9e4066Sahrens uint64_t fr_nblks; 234*fa9e4066Sahrens } free_range_t; 235*fa9e4066Sahrens 236*fa9e4066Sahrens dnode_t *dnode_special_open(struct objset_impl *dd, dnode_phys_t *dnp, 237*fa9e4066Sahrens uint64_t object); 238*fa9e4066Sahrens void dnode_special_close(dnode_t *dn); 239*fa9e4066Sahrens 240*fa9e4066Sahrens dnode_t *dnode_hold(struct objset_impl *dd, uint64_t object, void *ref); 241*fa9e4066Sahrens dnode_t *dnode_hold_impl(struct objset_impl *dd, uint64_t object, int flag, 242*fa9e4066Sahrens void *ref); 243*fa9e4066Sahrens void dnode_add_ref(dnode_t *dn, void *ref); 244*fa9e4066Sahrens void dnode_rele(dnode_t *dn, void *ref); 245*fa9e4066Sahrens void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); 246*fa9e4066Sahrens int dnode_sync(dnode_t *dn, int level, struct zio *zio, dmu_tx_t *tx); 247*fa9e4066Sahrens void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 248*fa9e4066Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 249*fa9e4066Sahrens void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 250*fa9e4066Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 251*fa9e4066Sahrens void dnode_free(dnode_t *dn, dmu_tx_t *tx); 252*fa9e4066Sahrens void dnode_byteswap(dnode_phys_t *dnp); 253*fa9e4066Sahrens void dnode_buf_byteswap(void *buf, size_t size); 254*fa9e4066Sahrens void dnode_verify(dnode_t *dn); 255*fa9e4066Sahrens int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx); 256*fa9e4066Sahrens uint64_t dnode_current_max_length(dnode_t *dn); 257*fa9e4066Sahrens uint64_t dnode_max_nonzero_offset(dnode_t *dn); 258*fa9e4066Sahrens void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx); 259*fa9e4066Sahrens void dnode_clear_range(dnode_t *dn, uint64_t blkid, 260*fa9e4066Sahrens uint64_t nblks, dmu_tx_t *tx); 261*fa9e4066Sahrens void dnode_diduse_space(dnode_t *dn, int64_t space); 262*fa9e4066Sahrens void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx); 263*fa9e4066Sahrens void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx); 264*fa9e4066Sahrens uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid); 265*fa9e4066Sahrens void dnode_init(void); 266*fa9e4066Sahrens void dnode_fini(void); 267*fa9e4066Sahrens int dnode_next_offset(dnode_t *dn, boolean_t hole, uint64_t *off, int minlvl, 268*fa9e4066Sahrens uint64_t blkfill); 269*fa9e4066Sahrens 270*fa9e4066Sahrens #ifdef ZFS_DEBUG 271*fa9e4066Sahrens 272*fa9e4066Sahrens /* 273*fa9e4066Sahrens * There should be a ## between the string literal and fmt, to make it 274*fa9e4066Sahrens * clear that we're joining two strings together, but that piece of shit 275*fa9e4066Sahrens * gcc doesn't support that preprocessor token. 276*fa9e4066Sahrens */ 277*fa9e4066Sahrens #define dprintf_dnode(dn, fmt, ...) do { \ 278*fa9e4066Sahrens if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 279*fa9e4066Sahrens char __db_buf[32]; \ 280*fa9e4066Sahrens uint64_t __db_obj = (dn)->dn_object; \ 281*fa9e4066Sahrens if (__db_obj == DMU_META_DNODE_OBJECT) \ 282*fa9e4066Sahrens (void) strcpy(__db_buf, "mdn"); \ 283*fa9e4066Sahrens else \ 284*fa9e4066Sahrens (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \ 285*fa9e4066Sahrens (u_longlong_t)__db_obj);\ 286*fa9e4066Sahrens dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \ 287*fa9e4066Sahrens __db_buf, __VA_ARGS__); \ 288*fa9e4066Sahrens } \ 289*fa9e4066Sahrens _NOTE(CONSTCOND) } while (0) 290*fa9e4066Sahrens 291*fa9e4066Sahrens #else 292*fa9e4066Sahrens 293*fa9e4066Sahrens #define dprintf_dnode(db, fmt, ...) 294*fa9e4066Sahrens 295*fa9e4066Sahrens #endif 296*fa9e4066Sahrens 297*fa9e4066Sahrens #ifdef __cplusplus 298*fa9e4066Sahrens } 299*fa9e4066Sahrens #endif 300*fa9e4066Sahrens 301*fa9e4066Sahrens #endif /* _SYS_DNODE_H */ 302