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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 #ifndef _SYS_DNODE_H 26 #define _SYS_DNODE_H 27 28 #include <sys/zfs_context.h> 29 #include <sys/avl.h> 30 #include <sys/spa.h> 31 #include <sys/txg.h> 32 #include <sys/zio.h> 33 #include <sys/refcount.h> 34 #include <sys/dmu_zfetch.h> 35 #include <sys/zrlock.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /* 42 * dnode_hold() flags. 43 */ 44 #define DNODE_MUST_BE_ALLOCATED 1 45 #define DNODE_MUST_BE_FREE 2 46 47 /* 48 * dnode_next_offset() flags. 49 */ 50 #define DNODE_FIND_HOLE 1 51 #define DNODE_FIND_BACKWARDS 2 52 #define DNODE_FIND_HAVELOCK 4 53 54 /* 55 * Fixed constants. 56 */ 57 #define DNODE_SHIFT 9 /* 512 bytes */ 58 #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 59 #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 60 #define DNODE_BLOCK_SHIFT 14 /* 16k */ 61 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 62 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 63 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 64 65 /* 66 * dnode id flags 67 * 68 * Note: a file will never ever have its 69 * ids moved from bonus->spill 70 * and only in a crypto environment would it be on spill 71 */ 72 #define DN_ID_CHKED_BONUS 0x1 73 #define DN_ID_CHKED_SPILL 0x2 74 #define DN_ID_OLD_EXIST 0x4 75 #define DN_ID_NEW_EXIST 0x8 76 77 /* 78 * Derived constants. 79 */ 80 #define DNODE_SIZE (1 << DNODE_SHIFT) 81 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 82 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 83 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 84 #define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1) 85 #define DN_KILL_SPILLBLK (1) 86 87 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 88 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 89 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 90 #define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT) 91 92 /* The +2 here is a cheesy way to round up */ 93 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \ 94 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT))) 95 96 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 97 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 98 99 #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \ 100 (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT) 101 102 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift)) 103 104 struct dmu_buf_impl; 105 struct objset; 106 struct zio; 107 108 enum dnode_dirtycontext { 109 DN_UNDIRTIED, 110 DN_DIRTY_OPEN, 111 DN_DIRTY_SYNC 112 }; 113 114 /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */ 115 #define DNODE_FLAG_USED_BYTES (1<<0) 116 #define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1) 117 118 /* Does dnode have a SA spill blkptr in bonus? */ 119 #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 120 121 typedef struct dnode_phys { 122 uint8_t dn_type; /* dmu_object_type_t */ 123 uint8_t dn_indblkshift; /* ln2(indirect block size) */ 124 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 125 uint8_t dn_nblkptr; /* length of dn_blkptr */ 126 uint8_t dn_bonustype; /* type of data in bonus buffer */ 127 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 128 uint8_t dn_compress; /* ZIO_COMPRESS type */ 129 uint8_t dn_flags; /* DNODE_FLAG_* */ 130 uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 131 uint16_t dn_bonuslen; /* length of dn_bonus */ 132 uint8_t dn_pad2[4]; 133 134 /* accounting is protected by dn_dirty_mtx */ 135 uint64_t dn_maxblkid; /* largest allocated block ID */ 136 uint64_t dn_used; /* bytes (or sectors) of disk space */ 137 138 uint64_t dn_pad3[4]; 139 140 blkptr_t dn_blkptr[1]; 141 uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)]; 142 blkptr_t dn_spill; 143 } dnode_phys_t; 144 145 typedef struct dnode { 146 /* 147 * dn_struct_rwlock protects the structure of the dnode, 148 * including the number of levels of indirection (dn_nlevels), 149 * dn_maxblkid, and dn_next_* 150 */ 151 krwlock_t dn_struct_rwlock; 152 153 /* Our link on dn_objset->os_dnodes list; protected by os_lock. */ 154 list_node_t dn_link; 155 156 /* immutable: */ 157 struct objset *dn_objset; 158 uint64_t dn_object; 159 struct dmu_buf_impl *dn_dbuf; 160 struct dnode_handle *dn_handle; 161 dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */ 162 163 /* 164 * Copies of stuff in dn_phys. They're valid in the open 165 * context (eg. even before the dnode is first synced). 166 * Where necessary, these are protected by dn_struct_rwlock. 167 */ 168 dmu_object_type_t dn_type; /* object type */ 169 uint16_t dn_bonuslen; /* bonus length */ 170 uint8_t dn_bonustype; /* bonus type */ 171 uint8_t dn_nblkptr; /* number of blkptrs (immutable) */ 172 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 173 uint8_t dn_compress; /* ZIO_COMPRESS type */ 174 uint8_t dn_nlevels; 175 uint8_t dn_indblkshift; 176 uint8_t dn_datablkshift; /* zero if blksz not power of 2! */ 177 uint8_t dn_moved; /* Has this dnode been moved? */ 178 uint16_t dn_datablkszsec; /* in 512b sectors */ 179 uint32_t dn_datablksz; /* in bytes */ 180 uint64_t dn_maxblkid; 181 uint8_t dn_next_nblkptr[TXG_SIZE]; 182 uint8_t dn_next_nlevels[TXG_SIZE]; 183 uint8_t dn_next_indblkshift[TXG_SIZE]; 184 uint8_t dn_next_bonustype[TXG_SIZE]; 185 uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */ 186 uint16_t dn_next_bonuslen[TXG_SIZE]; 187 uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */ 188 189 /* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */ 190 uint32_t dn_dbufs_count; /* count of dn_dbufs */ 191 192 /* protected by os_lock: */ 193 list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */ 194 195 /* protected by dn_mtx: */ 196 kmutex_t dn_mtx; 197 list_t dn_dirty_records[TXG_SIZE]; 198 avl_tree_t dn_ranges[TXG_SIZE]; 199 uint64_t dn_allocated_txg; 200 uint64_t dn_free_txg; 201 uint64_t dn_assigned_txg; 202 kcondvar_t dn_notxholds; 203 enum dnode_dirtycontext dn_dirtyctx; 204 uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */ 205 206 /* protected by own devices */ 207 refcount_t dn_tx_holds; 208 refcount_t dn_holds; 209 210 kmutex_t dn_dbufs_mtx; 211 list_t dn_dbufs; /* descendent dbufs */ 212 213 /* protected by dn_struct_rwlock */ 214 struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */ 215 216 boolean_t dn_have_spill; /* have spill or are spilling */ 217 218 /* parent IO for current sync write */ 219 zio_t *dn_zio; 220 221 /* used in syncing context */ 222 uint64_t dn_oldused; /* old phys used bytes */ 223 uint64_t dn_oldflags; /* old phys dn_flags */ 224 uint64_t dn_olduid, dn_oldgid; 225 uint64_t dn_newuid, dn_newgid; 226 int dn_id_flags; 227 228 /* holds prefetch structure */ 229 struct zfetch dn_zfetch; 230 } dnode_t; 231 232 /* 233 * Adds a level of indirection between the dbuf and the dnode to avoid 234 * iterating descendent dbufs in dnode_move(). Handles are not allocated 235 * individually, but as an array of child dnodes in dnode_hold_impl(). 236 */ 237 typedef struct dnode_handle { 238 /* Protects dnh_dnode from modification by dnode_move(). */ 239 zrlock_t dnh_zrlock; 240 dnode_t *dnh_dnode; 241 } dnode_handle_t; 242 243 typedef struct dnode_children { 244 size_t dnc_count; /* number of children */ 245 dnode_handle_t dnc_children[1]; /* sized dynamically */ 246 } dnode_children_t; 247 248 typedef struct free_range { 249 avl_node_t fr_node; 250 uint64_t fr_blkid; 251 uint64_t fr_nblks; 252 } free_range_t; 253 254 dnode_t *dnode_special_open(struct objset *dd, dnode_phys_t *dnp, 255 uint64_t object, dnode_handle_t *dnh); 256 void dnode_special_close(dnode_handle_t *dnh); 257 258 void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx); 259 void dnode_setbonus_type(dnode_t *dn, dmu_object_type_t, dmu_tx_t *tx); 260 void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx); 261 262 int dnode_hold(struct objset *dd, uint64_t object, 263 void *ref, dnode_t **dnp); 264 int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, 265 void *ref, dnode_t **dnp); 266 boolean_t dnode_add_ref(dnode_t *dn, void *ref); 267 void dnode_rele(dnode_t *dn, void *ref); 268 void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); 269 void dnode_sync(dnode_t *dn, dmu_tx_t *tx); 270 void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 271 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 272 void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 273 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 274 void dnode_free(dnode_t *dn, dmu_tx_t *tx); 275 void dnode_byteswap(dnode_phys_t *dnp); 276 void dnode_buf_byteswap(void *buf, size_t size); 277 void dnode_verify(dnode_t *dn); 278 int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx); 279 uint64_t dnode_current_max_length(dnode_t *dn); 280 void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx); 281 void dnode_clear_range(dnode_t *dn, uint64_t blkid, 282 uint64_t nblks, dmu_tx_t *tx); 283 void dnode_diduse_space(dnode_t *dn, int64_t space); 284 void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx); 285 void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t); 286 uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid); 287 void dnode_init(void); 288 void dnode_fini(void); 289 int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off, 290 int minlvl, uint64_t blkfill, uint64_t txg); 291 void dnode_evict_dbufs(dnode_t *dn); 292 293 #ifdef ZFS_DEBUG 294 295 /* 296 * There should be a ## between the string literal and fmt, to make it 297 * clear that we're joining two strings together, but that piece of shit 298 * gcc doesn't support that preprocessor token. 299 */ 300 #define dprintf_dnode(dn, fmt, ...) do { \ 301 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 302 char __db_buf[32]; \ 303 uint64_t __db_obj = (dn)->dn_object; \ 304 if (__db_obj == DMU_META_DNODE_OBJECT) \ 305 (void) strcpy(__db_buf, "mdn"); \ 306 else \ 307 (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \ 308 (u_longlong_t)__db_obj);\ 309 dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \ 310 __db_buf, __VA_ARGS__); \ 311 } \ 312 _NOTE(CONSTCOND) } while (0) 313 314 #define DNODE_VERIFY(dn) dnode_verify(dn) 315 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx) 316 317 #else 318 319 #define dprintf_dnode(db, fmt, ...) 320 #define DNODE_VERIFY(dn) 321 #define FREE_VERIFY(db, start, end, tx) 322 323 #endif 324 325 #ifdef __cplusplus 326 } 327 #endif 328 329 #endif /* _SYS_DNODE_H */ 330