1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_DNODE_H 27 #define _SYS_DNODE_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/zfs_context.h> 32 #include <sys/avl.h> 33 #include <sys/spa.h> 34 #include <sys/txg.h> 35 #include <sys/refcount.h> 36 #include <sys/dmu_zfetch.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /* 43 * Flags. 44 */ 45 #define DNODE_MUST_BE_ALLOCATED 1 46 #define DNODE_MUST_BE_FREE 2 47 48 /* 49 * Fixed constants. 50 */ 51 #define DNODE_SHIFT 9 /* 512 bytes */ 52 #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 53 #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 54 #define DNODE_BLOCK_SHIFT 14 /* 16k */ 55 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 56 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 57 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 58 59 /* 60 * Derived constants. 61 */ 62 #define DNODE_SIZE (1 << DNODE_SHIFT) 63 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 64 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 65 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 66 67 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 68 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 69 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 70 71 /* The +2 here is a cheesy way to round up */ 72 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \ 73 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT))) 74 75 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 76 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 77 78 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift)) 79 80 struct dmu_buf_impl; 81 struct objset_impl; 82 struct zio; 83 84 enum dnode_dirtycontext { 85 DN_UNDIRTIED, 86 DN_DIRTY_OPEN, 87 DN_DIRTY_SYNC 88 }; 89 90 typedef struct dnode_phys { 91 uint8_t dn_type; /* dmu_object_type_t */ 92 uint8_t dn_indblkshift; /* ln2(indirect block size) */ 93 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 94 uint8_t dn_nblkptr; /* length of dn_blkptr */ 95 uint8_t dn_bonustype; /* type of data in bonus buffer */ 96 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 97 uint8_t dn_compress; /* ZIO_COMPRESS type */ 98 uint8_t dn_pad1[1]; 99 uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 100 uint16_t dn_bonuslen; /* length of dn_bonus */ 101 uint8_t dn_pad2[4]; 102 103 /* accounting is protected by dn_dirty_mtx */ 104 uint64_t dn_maxblkid; /* largest allocated block ID */ 105 uint64_t dn_secphys; /* 512b sectors of disk space used */ 106 107 uint64_t dn_pad3[4]; 108 109 blkptr_t dn_blkptr[1]; 110 uint8_t dn_bonus[DN_MAX_BONUSLEN]; 111 } dnode_phys_t; 112 113 typedef struct dnode { 114 /* 115 * dn_struct_rwlock protects the structure of the dnode, 116 * including the number of levels of indirection (dn_nlevels), 117 * dn_maxblkid, and dn_next_* 118 */ 119 krwlock_t dn_struct_rwlock; 120 121 /* 122 * Our link on dataset's dd_dnodes list. 123 * Protected by dd_accounting_mtx. 124 */ 125 list_node_t dn_link; 126 127 /* immutable: */ 128 struct objset_impl *dn_objset; 129 uint64_t dn_object; 130 struct dmu_buf_impl *dn_dbuf; 131 dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */ 132 133 /* 134 * Copies of stuff in dn_phys. They're valid in the open 135 * context (eg. even before the dnode is first synced). 136 * Where necessary, these are protected by dn_struct_rwlock. 137 */ 138 dmu_object_type_t dn_type; /* object type */ 139 uint16_t dn_bonuslen; /* bonus length */ 140 uint8_t dn_bonustype; /* bonus type */ 141 uint8_t dn_nblkptr; /* number of blkptrs (immutable) */ 142 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 143 uint8_t dn_compress; /* ZIO_COMPRESS type */ 144 uint8_t dn_nlevels; 145 uint8_t dn_indblkshift; 146 uint8_t dn_datablkshift; /* zero if blksz not power of 2! */ 147 uint16_t dn_datablkszsec; /* in 512b sectors */ 148 uint32_t dn_datablksz; /* in bytes */ 149 uint64_t dn_maxblkid; 150 uint8_t dn_next_nlevels[TXG_SIZE]; 151 uint8_t dn_next_indblkshift[TXG_SIZE]; 152 uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */ 153 154 /* protected by os_lock: */ 155 list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */ 156 157 /* protected by dn_mtx: */ 158 kmutex_t dn_mtx; 159 list_t dn_dirty_dbufs[TXG_SIZE]; 160 avl_tree_t dn_ranges[TXG_SIZE]; 161 uint64_t dn_allocated_txg; 162 uint64_t dn_free_txg; 163 uint64_t dn_assigned_txg; 164 struct dmu_tx *dn_assigned_tx; /* if only one tx cares */ 165 kcondvar_t dn_notxholds; 166 enum dnode_dirtycontext dn_dirtyctx; 167 uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */ 168 169 /* protected by own devices */ 170 refcount_t dn_tx_holds; 171 refcount_t dn_holds; 172 173 kmutex_t dn_dbufs_mtx; 174 list_t dn_dbufs; /* linked list of descendent dbuf_t's */ 175 struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */ 176 177 /* holds prefetch structure */ 178 struct zfetch dn_zfetch; 179 } dnode_t; 180 181 typedef struct free_range { 182 avl_node_t fr_node; 183 uint64_t fr_blkid; 184 uint64_t fr_nblks; 185 } free_range_t; 186 187 dnode_t *dnode_special_open(struct objset_impl *dd, dnode_phys_t *dnp, 188 uint64_t object); 189 void dnode_special_close(dnode_t *dn); 190 191 int dnode_hold(struct objset_impl *dd, uint64_t object, 192 void *ref, dnode_t **dnp); 193 int dnode_hold_impl(struct objset_impl *dd, uint64_t object, int flag, 194 void *ref, dnode_t **dnp); 195 void dnode_add_ref(dnode_t *dn, void *ref); 196 void dnode_rele(dnode_t *dn, void *ref); 197 void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); 198 int dnode_sync(dnode_t *dn, int level, struct zio *zio, dmu_tx_t *tx); 199 void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 200 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 201 void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 202 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 203 void dnode_free(dnode_t *dn, dmu_tx_t *tx); 204 void dnode_byteswap(dnode_phys_t *dnp); 205 void dnode_buf_byteswap(void *buf, size_t size); 206 void dnode_verify(dnode_t *dn); 207 int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx); 208 uint64_t dnode_current_max_length(dnode_t *dn); 209 uint64_t dnode_max_nonzero_offset(dnode_t *dn); 210 void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx); 211 void dnode_clear_range(dnode_t *dn, uint64_t blkid, 212 uint64_t nblks, dmu_tx_t *tx); 213 void dnode_diduse_space(dnode_t *dn, int64_t space); 214 void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx); 215 void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx); 216 uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid); 217 void dnode_init(void); 218 void dnode_fini(void); 219 int dnode_next_offset(dnode_t *dn, boolean_t hole, uint64_t *off, int minlvl, 220 uint64_t blkfill); 221 int dnode_evict_dbufs(dnode_t *dn, int try); 222 223 #ifdef ZFS_DEBUG 224 225 /* 226 * There should be a ## between the string literal and fmt, to make it 227 * clear that we're joining two strings together, but that piece of shit 228 * gcc doesn't support that preprocessor token. 229 */ 230 #define dprintf_dnode(dn, fmt, ...) do { \ 231 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 232 char __db_buf[32]; \ 233 uint64_t __db_obj = (dn)->dn_object; \ 234 if (__db_obj == DMU_META_DNODE_OBJECT) \ 235 (void) strcpy(__db_buf, "mdn"); \ 236 else \ 237 (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \ 238 (u_longlong_t)__db_obj);\ 239 dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \ 240 __db_buf, __VA_ARGS__); \ 241 } \ 242 _NOTE(CONSTCOND) } while (0) 243 244 #define DNODE_VERIFY(dn) dnode_verify(dn) 245 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx) 246 247 #else 248 249 #define dprintf_dnode(db, fmt, ...) 250 #define DNODE_VERIFY(dn) 251 #define FREE_VERIFY(db, start, end, tx) 252 253 #endif 254 255 #ifdef __cplusplus 256 } 257 #endif 258 259 #endif /* _SYS_DNODE_H */ 260