1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22*c717a561Smaybee * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #ifndef _SYS_DNODE_H 27fa9e4066Sahrens #define _SYS_DNODE_H 28fa9e4066Sahrens 29fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 30fa9e4066Sahrens 31fa9e4066Sahrens #include <sys/zfs_context.h> 32fa9e4066Sahrens #include <sys/avl.h> 33fa9e4066Sahrens #include <sys/spa.h> 34fa9e4066Sahrens #include <sys/txg.h> 35*c717a561Smaybee #include <sys/zio.h> 36fa9e4066Sahrens #include <sys/refcount.h> 37fa9e4066Sahrens #include <sys/dmu_zfetch.h> 38fa9e4066Sahrens 39fa9e4066Sahrens #ifdef __cplusplus 40fa9e4066Sahrens extern "C" { 41fa9e4066Sahrens #endif 42fa9e4066Sahrens 43fa9e4066Sahrens /* 44fa9e4066Sahrens * Flags. 45fa9e4066Sahrens */ 46fa9e4066Sahrens #define DNODE_MUST_BE_ALLOCATED 1 47fa9e4066Sahrens #define DNODE_MUST_BE_FREE 2 48fa9e4066Sahrens 49fa9e4066Sahrens /* 50fa9e4066Sahrens * Fixed constants. 51fa9e4066Sahrens */ 52fa9e4066Sahrens #define DNODE_SHIFT 9 /* 512 bytes */ 53fa9e4066Sahrens #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 54fa9e4066Sahrens #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 55fa9e4066Sahrens #define DNODE_BLOCK_SHIFT 14 /* 16k */ 56fa9e4066Sahrens #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 57fa9e4066Sahrens #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 58fa9e4066Sahrens #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 59fa9e4066Sahrens 60fa9e4066Sahrens /* 61fa9e4066Sahrens * Derived constants. 62fa9e4066Sahrens */ 63fa9e4066Sahrens #define DNODE_SIZE (1 << DNODE_SHIFT) 64fa9e4066Sahrens #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 65fa9e4066Sahrens #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 66ea8dc4b6Seschrock #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 67fa9e4066Sahrens 68fa9e4066Sahrens #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 69fa9e4066Sahrens #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 70fa9e4066Sahrens #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 71fa9e4066Sahrens 72fa9e4066Sahrens /* The +2 here is a cheesy way to round up */ 73fa9e4066Sahrens #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \ 74fa9e4066Sahrens (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT))) 75fa9e4066Sahrens 76fa9e4066Sahrens #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 77fa9e4066Sahrens (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 78fa9e4066Sahrens 7999653d4eSeschrock #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \ 8099653d4eSeschrock (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT) 8199653d4eSeschrock 82fa9e4066Sahrens #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift)) 83fa9e4066Sahrens 84fa9e4066Sahrens struct dmu_buf_impl; 85fa9e4066Sahrens struct objset_impl; 86fa9e4066Sahrens struct zio; 87fa9e4066Sahrens 88fa9e4066Sahrens enum dnode_dirtycontext { 89fa9e4066Sahrens DN_UNDIRTIED, 90fa9e4066Sahrens DN_DIRTY_OPEN, 91fa9e4066Sahrens DN_DIRTY_SYNC 92fa9e4066Sahrens }; 93fa9e4066Sahrens 9499653d4eSeschrock /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */ 9599653d4eSeschrock #define DNODE_FLAG_USED_BYTES (1<<0) 9699653d4eSeschrock 97fa9e4066Sahrens typedef struct dnode_phys { 98fa9e4066Sahrens uint8_t dn_type; /* dmu_object_type_t */ 99fa9e4066Sahrens uint8_t dn_indblkshift; /* ln2(indirect block size) */ 100fa9e4066Sahrens uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 101fa9e4066Sahrens uint8_t dn_nblkptr; /* length of dn_blkptr */ 102fa9e4066Sahrens uint8_t dn_bonustype; /* type of data in bonus buffer */ 103fa9e4066Sahrens uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 104fa9e4066Sahrens uint8_t dn_compress; /* ZIO_COMPRESS type */ 10599653d4eSeschrock uint8_t dn_flags; /* DNODE_FLAG_* */ 106fa9e4066Sahrens uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 107fa9e4066Sahrens uint16_t dn_bonuslen; /* length of dn_bonus */ 108fa9e4066Sahrens uint8_t dn_pad2[4]; 109fa9e4066Sahrens 110fa9e4066Sahrens /* accounting is protected by dn_dirty_mtx */ 111fa9e4066Sahrens uint64_t dn_maxblkid; /* largest allocated block ID */ 11299653d4eSeschrock uint64_t dn_used; /* bytes (or sectors) of disk space */ 113fa9e4066Sahrens 114fa9e4066Sahrens uint64_t dn_pad3[4]; 115fa9e4066Sahrens 116fa9e4066Sahrens blkptr_t dn_blkptr[1]; 117fa9e4066Sahrens uint8_t dn_bonus[DN_MAX_BONUSLEN]; 118fa9e4066Sahrens } dnode_phys_t; 119fa9e4066Sahrens 120fa9e4066Sahrens typedef struct dnode { 121fa9e4066Sahrens /* 122c543ec06Sahrens * dn_struct_rwlock protects the structure of the dnode, 123c543ec06Sahrens * including the number of levels of indirection (dn_nlevels), 124c543ec06Sahrens * dn_maxblkid, and dn_next_* 125fa9e4066Sahrens */ 126fa9e4066Sahrens krwlock_t dn_struct_rwlock; 127fa9e4066Sahrens 128fa9e4066Sahrens /* 129fa9e4066Sahrens * Our link on dataset's dd_dnodes list. 130fa9e4066Sahrens * Protected by dd_accounting_mtx. 131fa9e4066Sahrens */ 132fa9e4066Sahrens list_node_t dn_link; 133fa9e4066Sahrens 134fa9e4066Sahrens /* immutable: */ 135fa9e4066Sahrens struct objset_impl *dn_objset; 136fa9e4066Sahrens uint64_t dn_object; 137fa9e4066Sahrens struct dmu_buf_impl *dn_dbuf; 138fa9e4066Sahrens dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */ 139fa9e4066Sahrens 140fa9e4066Sahrens /* 141c543ec06Sahrens * Copies of stuff in dn_phys. They're valid in the open 142c543ec06Sahrens * context (eg. even before the dnode is first synced). 143c543ec06Sahrens * Where necessary, these are protected by dn_struct_rwlock. 144fa9e4066Sahrens */ 145c543ec06Sahrens dmu_object_type_t dn_type; /* object type */ 146c543ec06Sahrens uint16_t dn_bonuslen; /* bonus length */ 147c543ec06Sahrens uint8_t dn_bonustype; /* bonus type */ 148fa9e4066Sahrens uint8_t dn_nblkptr; /* number of blkptrs (immutable) */ 149fa9e4066Sahrens uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 150fa9e4066Sahrens uint8_t dn_compress; /* ZIO_COMPRESS type */ 151fa9e4066Sahrens uint8_t dn_nlevels; 152fa9e4066Sahrens uint8_t dn_indblkshift; 153c543ec06Sahrens uint8_t dn_datablkshift; /* zero if blksz not power of 2! */ 154c543ec06Sahrens uint16_t dn_datablkszsec; /* in 512b sectors */ 155c543ec06Sahrens uint32_t dn_datablksz; /* in bytes */ 156c543ec06Sahrens uint64_t dn_maxblkid; 157fa9e4066Sahrens uint8_t dn_next_nlevels[TXG_SIZE]; 158fa9e4066Sahrens uint8_t dn_next_indblkshift[TXG_SIZE]; 159c543ec06Sahrens uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */ 160fa9e4066Sahrens 161fa9e4066Sahrens /* protected by os_lock: */ 162fa9e4066Sahrens list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */ 163fa9e4066Sahrens 164fa9e4066Sahrens /* protected by dn_mtx: */ 165fa9e4066Sahrens kmutex_t dn_mtx; 166*c717a561Smaybee list_t dn_dirty_records[TXG_SIZE]; 167fa9e4066Sahrens avl_tree_t dn_ranges[TXG_SIZE]; 168fa9e4066Sahrens uint64_t dn_allocated_txg; 169fa9e4066Sahrens uint64_t dn_free_txg; 170fa9e4066Sahrens uint64_t dn_assigned_txg; 171fa9e4066Sahrens kcondvar_t dn_notxholds; 172fa9e4066Sahrens enum dnode_dirtycontext dn_dirtyctx; 173fa9e4066Sahrens uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */ 174fa9e4066Sahrens 175fa9e4066Sahrens /* protected by own devices */ 176fa9e4066Sahrens refcount_t dn_tx_holds; 177fa9e4066Sahrens refcount_t dn_holds; 178fa9e4066Sahrens 179fa9e4066Sahrens kmutex_t dn_dbufs_mtx; 180fa9e4066Sahrens list_t dn_dbufs; /* linked list of descendent dbuf_t's */ 181ea8dc4b6Seschrock struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */ 182fa9e4066Sahrens 183*c717a561Smaybee /* parent IO for current sync write */ 184*c717a561Smaybee zio_t *dn_zio; 185*c717a561Smaybee 186fa9e4066Sahrens /* holds prefetch structure */ 187fa9e4066Sahrens struct zfetch dn_zfetch; 188fa9e4066Sahrens } dnode_t; 189fa9e4066Sahrens 190fa9e4066Sahrens typedef struct free_range { 191fa9e4066Sahrens avl_node_t fr_node; 192fa9e4066Sahrens uint64_t fr_blkid; 193fa9e4066Sahrens uint64_t fr_nblks; 194fa9e4066Sahrens } free_range_t; 195fa9e4066Sahrens 196fa9e4066Sahrens dnode_t *dnode_special_open(struct objset_impl *dd, dnode_phys_t *dnp, 197fa9e4066Sahrens uint64_t object); 198fa9e4066Sahrens void dnode_special_close(dnode_t *dn); 199fa9e4066Sahrens 200ea8dc4b6Seschrock int dnode_hold(struct objset_impl *dd, uint64_t object, 201ea8dc4b6Seschrock void *ref, dnode_t **dnp); 202ea8dc4b6Seschrock int dnode_hold_impl(struct objset_impl *dd, uint64_t object, int flag, 203ea8dc4b6Seschrock void *ref, dnode_t **dnp); 204fa9e4066Sahrens void dnode_add_ref(dnode_t *dn, void *ref); 205fa9e4066Sahrens void dnode_rele(dnode_t *dn, void *ref); 206fa9e4066Sahrens void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); 207*c717a561Smaybee void dnode_sync(dnode_t *dn, dmu_tx_t *tx); 208fa9e4066Sahrens void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 209fa9e4066Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 210fa9e4066Sahrens void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 211fa9e4066Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 212fa9e4066Sahrens void dnode_free(dnode_t *dn, dmu_tx_t *tx); 213fa9e4066Sahrens void dnode_byteswap(dnode_phys_t *dnp); 214fa9e4066Sahrens void dnode_buf_byteswap(void *buf, size_t size); 215fa9e4066Sahrens void dnode_verify(dnode_t *dn); 216fa9e4066Sahrens int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx); 217fa9e4066Sahrens uint64_t dnode_current_max_length(dnode_t *dn); 218fa9e4066Sahrens void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx); 219fa9e4066Sahrens void dnode_clear_range(dnode_t *dn, uint64_t blkid, 220fa9e4066Sahrens uint64_t nblks, dmu_tx_t *tx); 221fa9e4066Sahrens void dnode_diduse_space(dnode_t *dn, int64_t space); 222fa9e4066Sahrens void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx); 223fa9e4066Sahrens void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx); 224fa9e4066Sahrens uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid); 225fa9e4066Sahrens void dnode_init(void); 226fa9e4066Sahrens void dnode_fini(void); 227fa9e4066Sahrens int dnode_next_offset(dnode_t *dn, boolean_t hole, uint64_t *off, int minlvl, 2286754306eSahrens uint64_t blkfill, uint64_t txg); 229436b2950Sperrin int dnode_evict_dbufs(dnode_t *dn, int try); 230fa9e4066Sahrens 231fa9e4066Sahrens #ifdef ZFS_DEBUG 232fa9e4066Sahrens 233fa9e4066Sahrens /* 234fa9e4066Sahrens * There should be a ## between the string literal and fmt, to make it 235fa9e4066Sahrens * clear that we're joining two strings together, but that piece of shit 236fa9e4066Sahrens * gcc doesn't support that preprocessor token. 237fa9e4066Sahrens */ 238fa9e4066Sahrens #define dprintf_dnode(dn, fmt, ...) do { \ 239fa9e4066Sahrens if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 240fa9e4066Sahrens char __db_buf[32]; \ 241fa9e4066Sahrens uint64_t __db_obj = (dn)->dn_object; \ 242fa9e4066Sahrens if (__db_obj == DMU_META_DNODE_OBJECT) \ 243fa9e4066Sahrens (void) strcpy(__db_buf, "mdn"); \ 244fa9e4066Sahrens else \ 245fa9e4066Sahrens (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \ 246fa9e4066Sahrens (u_longlong_t)__db_obj);\ 247fa9e4066Sahrens dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \ 248fa9e4066Sahrens __db_buf, __VA_ARGS__); \ 249fa9e4066Sahrens } \ 250fa9e4066Sahrens _NOTE(CONSTCOND) } while (0) 251fa9e4066Sahrens 2529c9dc39aSek110237 #define DNODE_VERIFY(dn) dnode_verify(dn) 2539c9dc39aSek110237 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx) 2549c9dc39aSek110237 255fa9e4066Sahrens #else 256fa9e4066Sahrens 257fa9e4066Sahrens #define dprintf_dnode(db, fmt, ...) 2589c9dc39aSek110237 #define DNODE_VERIFY(dn) 2599c9dc39aSek110237 #define FREE_VERIFY(db, start, end, tx) 260fa9e4066Sahrens 261fa9e4066Sahrens #endif 262fa9e4066Sahrens 263fa9e4066Sahrens #ifdef __cplusplus 264fa9e4066Sahrens } 265fa9e4066Sahrens #endif 266fa9e4066Sahrens 267fa9e4066Sahrens #endif /* _SYS_DNODE_H */ 268