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 * Copyright (c) 2012, 2018 by Delphix. All rights reserved. 24 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 25 */ 26 27 #ifndef _SYS_DNODE_H 28 #define _SYS_DNODE_H 29 30 #include <sys/zfs_context.h> 31 #include <sys/avl.h> 32 #include <sys/spa.h> 33 #include <sys/txg.h> 34 #include <sys/zio.h> 35 #include <sys/refcount.h> 36 #include <sys/dmu_zfetch.h> 37 #include <sys/zrlock.h> 38 #include <sys/multilist.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /* 45 * dnode_hold() flags. 46 */ 47 #define DNODE_MUST_BE_ALLOCATED 1 48 #define DNODE_MUST_BE_FREE 2 49 #define DNODE_DRY_RUN 4 50 51 /* 52 * dnode_next_offset() flags. 53 */ 54 #define DNODE_FIND_HOLE 1 55 #define DNODE_FIND_BACKWARDS 2 56 #define DNODE_FIND_HAVELOCK 4 57 58 /* 59 * Fixed constants. 60 */ 61 #define DNODE_SHIFT 9 /* 512 bytes */ 62 #define DN_MIN_INDBLKSHIFT 12 /* 4k */ 63 /* 64 * If we ever increase this value beyond 20, we need to revisit all logic that 65 * does x << level * ebps to handle overflow. With a 1M indirect block size, 66 * 4 levels of indirect blocks would not be able to guarantee addressing an 67 * entire object, so 5 levels will be used, but 5 * (20 - 7) = 65. 68 */ 69 #define DN_MAX_INDBLKSHIFT 17 /* 128k */ 70 #define DNODE_BLOCK_SHIFT 14 /* 16k */ 71 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 72 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 73 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 74 75 /* 76 * dnode id flags 77 * 78 * Note: a file will never ever have its ids moved from bonus->spill 79 */ 80 #define DN_ID_CHKED_BONUS 0x1 81 #define DN_ID_CHKED_SPILL 0x2 82 #define DN_ID_OLD_EXIST 0x4 83 #define DN_ID_NEW_EXIST 0x8 84 85 /* 86 * Derived constants. 87 */ 88 #define DNODE_MIN_SIZE (1 << DNODE_SHIFT) 89 #define DNODE_MAX_SIZE (1 << DNODE_BLOCK_SHIFT) 90 #define DNODE_BLOCK_SIZE (1 << DNODE_BLOCK_SHIFT) 91 #define DNODE_MIN_SLOTS (DNODE_MIN_SIZE >> DNODE_SHIFT) 92 #define DNODE_MAX_SLOTS (DNODE_MAX_SIZE >> DNODE_SHIFT) 93 #define DN_BONUS_SIZE(dnsize) ((dnsize) - DNODE_CORE_SIZE - \ 94 (1 << SPA_BLKPTRSHIFT)) 95 #define DN_SLOTS_TO_BONUSLEN(slots) DN_BONUS_SIZE((slots) << DNODE_SHIFT) 96 #define DN_OLD_MAX_BONUSLEN (DN_BONUS_SIZE(DNODE_MIN_SIZE)) 97 #define DN_MAX_NBLKPTR ((DNODE_MIN_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 98 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 99 #define DN_ZERO_BONUSLEN (DN_BONUS_SIZE(DNODE_MAX_SIZE) + 1) 100 #define DN_KILL_SPILLBLK (1) 101 102 #define DN_SLOT_UNINIT ((void *)NULL) /* Uninitialized */ 103 #define DN_SLOT_FREE ((void *)1UL) /* Free slot */ 104 #define DN_SLOT_ALLOCATED ((void *)2UL) /* Allocated slot */ 105 #define DN_SLOT_INTERIOR ((void *)3UL) /* Interior allocated slot */ 106 #define DN_SLOT_IS_PTR(dn) ((void *)dn > DN_SLOT_INTERIOR) 107 #define DN_SLOT_IS_VALID(dn) ((void *)dn != NULL) 108 109 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 110 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 111 112 /* 113 * This is inaccurate if the indblkshift of the particular object is not the 114 * max. But it's only used by userland to calculate the zvol reservation. 115 */ 116 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 117 #define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT) 118 119 /* The +2 here is a cheesy way to round up */ 120 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \ 121 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT))) 122 123 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 124 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 125 #define DN_MAX_BONUS_LEN(dnp) \ 126 ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) ? \ 127 (uint8_t *)DN_SPILL_BLKPTR(dnp) - (uint8_t *)DN_BONUS(dnp) : \ 128 (uint8_t *)(dnp + (dnp->dn_extra_slots + 1)) - (uint8_t *)DN_BONUS(dnp)) 129 130 #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \ 131 (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT) 132 133 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift)) 134 135 struct dmu_buf_impl; 136 struct objset; 137 struct zio; 138 139 enum dnode_dirtycontext { 140 DN_UNDIRTIED, 141 DN_DIRTY_OPEN, 142 DN_DIRTY_SYNC 143 }; 144 145 /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */ 146 #define DNODE_FLAG_USED_BYTES (1 << 0) 147 #define DNODE_FLAG_USERUSED_ACCOUNTED (1 << 1) 148 149 /* Does dnode have a SA spill blkptr in bonus? */ 150 #define DNODE_FLAG_SPILL_BLKPTR (1 << 2) 151 152 /* User/Group/Project dnode accounting */ 153 #define DNODE_FLAG_USEROBJUSED_ACCOUNTED (1 << 3) 154 155 /* 156 * VARIABLE-LENGTH (LARGE) DNODES 157 * 158 * The motivation for variable-length dnodes is to eliminate the overhead 159 * associated with using spill blocks. Spill blocks are used to store 160 * system attribute data (i.e. file metadata) that does not fit in the 161 * dnode's bonus buffer. By allowing a larger bonus buffer area the use of 162 * a spill block can be avoided. Spill blocks potentially incur an 163 * additional read I/O for every dnode in a dnode block. As a worst case 164 * example, reading 32 dnodes from a 16k dnode block and all of the spill 165 * blocks could issue 33 separate reads. Now suppose those dnodes have size 166 * 1024 and therefore don't need spill blocks. Then the worst case number 167 * of blocks read is reduced to from 33 to two--one per dnode block. 168 * 169 * ZFS-on-Linux systems that make heavy use of extended attributes benefit 170 * from this feature. In particular, ZFS-on-Linux supports the xattr=sa 171 * dataset property which allows file extended attribute data to be stored 172 * in the dnode bonus buffer as an alternative to the traditional 173 * directory-based format. Workloads such as SELinux and the Lustre 174 * distributed filesystem often store enough xattr data to force spill 175 * blocks when xattr=sa is in effect. Large dnodes may therefore provide a 176 * performance benefit to such systems. Other use cases that benefit from 177 * this feature include files with large ACLs and symbolic links with long 178 * target names. 179 * 180 * The size of a dnode may be a multiple of 512 bytes up to the size of a 181 * dnode block (currently 16384 bytes). The dn_extra_slots field of the 182 * on-disk dnode_phys_t structure describes the size of the physical dnode 183 * on disk. The field represents how many "extra" dnode_phys_t slots a 184 * dnode consumes in its dnode block. This convention results in a value of 185 * 0 for 512 byte dnodes which preserves on-disk format compatibility with 186 * older software which doesn't support large dnodes. 187 * 188 * Similarly, the in-memory dnode_t structure has a dn_num_slots field 189 * to represent the total number of dnode_phys_t slots consumed on disk. 190 * Thus dn->dn_num_slots is 1 greater than the corresponding 191 * dnp->dn_extra_slots. This difference in convention was adopted 192 * because, unlike on-disk structures, backward compatibility is not a 193 * concern for in-memory objects, so we used a more natural way to 194 * represent size for a dnode_t. 195 * 196 * The default size for newly created dnodes is determined by the value of 197 * the "dnodesize" dataset property. By default the property is set to 198 * "legacy" which is compatible with older software. Setting the property 199 * to "auto" will allow the filesystem to choose the most suitable dnode 200 * size. Currently this just sets the default dnode size to 1k, but future 201 * code improvements could dynamically choose a size based on observed 202 * workload patterns. Dnodes of varying sizes can coexist within the same 203 * dataset and even within the same dnode block. 204 */ 205 206 #define DNODE_CRYPT_PORTABLE_FLAGS_MASK (DNODE_FLAG_SPILL_BLKPTR) 207 208 typedef struct dnode_phys { 209 uint8_t dn_type; /* dmu_object_type_t */ 210 uint8_t dn_indblkshift; /* ln2(indirect block size) */ 211 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 212 uint8_t dn_nblkptr; /* length of dn_blkptr */ 213 uint8_t dn_bonustype; /* type of data in bonus buffer */ 214 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 215 uint8_t dn_compress; /* ZIO_COMPRESS type */ 216 uint8_t dn_flags; /* DNODE_FLAG_* */ 217 uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 218 uint16_t dn_bonuslen; /* length of dn_bonus */ 219 uint8_t dn_extra_slots; /* # of subsequent slots consumed */ 220 uint8_t dn_pad2[3]; 221 222 /* accounting is protected by dn_dirty_mtx */ 223 uint64_t dn_maxblkid; /* largest allocated block ID */ 224 uint64_t dn_used; /* bytes (or sectors) of disk space */ 225 226 /* 227 * Both dn_pad2 and dn_pad3 are protected by the block's MAC. This 228 * allows us to protect any fields that might be added here in the 229 * future. In either case, developers will want to check 230 * zio_crypt_init_uios_dnode() to ensure the new field is being 231 * protected properly. 232 */ 233 uint64_t dn_pad3[4]; 234 union { 235 blkptr_t dn_blkptr[1+DN_OLD_MAX_BONUSLEN/sizeof (blkptr_t)]; 236 struct { 237 blkptr_t __dn_ignore1; 238 uint8_t dn_bonus[DN_OLD_MAX_BONUSLEN]; 239 }; 240 struct { 241 blkptr_t __dn_ignore2; 242 uint8_t __dn_ignore3[DN_OLD_MAX_BONUSLEN - 243 sizeof (blkptr_t)]; 244 blkptr_t dn_spill; 245 }; 246 }; 247 } dnode_phys_t; 248 249 #define DN_SPILL_BLKPTR(dnp) ((blkptr_t *)((char *)(dnp) + \ 250 (((dnp)->dn_extra_slots + 1) << DNODE_SHIFT) - (1 << SPA_BLKPTRSHIFT))) 251 252 struct dnode { 253 /* 254 * Protects the structure of the dnode, including the number of levels 255 * of indirection (dn_nlevels), dn_maxblkid, and dn_next_* 256 */ 257 krwlock_t dn_struct_rwlock; 258 259 /* Our link on dn_objset->os_dnodes list; protected by os_lock. */ 260 list_node_t dn_link; 261 262 /* immutable: */ 263 struct objset *dn_objset; 264 uint64_t dn_object; 265 struct dmu_buf_impl *dn_dbuf; 266 struct dnode_handle *dn_handle; 267 dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */ 268 269 /* 270 * Copies of stuff in dn_phys. They're valid in the open 271 * context (eg. even before the dnode is first synced). 272 * Where necessary, these are protected by dn_struct_rwlock. 273 */ 274 dmu_object_type_t dn_type; /* object type */ 275 uint16_t dn_bonuslen; /* bonus length */ 276 uint8_t dn_bonustype; /* bonus type */ 277 uint8_t dn_nblkptr; /* number of blkptrs (immutable) */ 278 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 279 uint8_t dn_compress; /* ZIO_COMPRESS type */ 280 uint8_t dn_nlevels; 281 uint8_t dn_indblkshift; 282 uint8_t dn_datablkshift; /* zero if blksz not power of 2! */ 283 uint8_t dn_moved; /* Has this dnode been moved? */ 284 uint16_t dn_datablkszsec; /* in 512b sectors */ 285 uint32_t dn_datablksz; /* in bytes */ 286 uint64_t dn_maxblkid; 287 uint8_t dn_next_type[TXG_SIZE]; 288 uint8_t dn_num_slots; /* metadnode slots consumed on disk */ 289 uint8_t dn_next_nblkptr[TXG_SIZE]; 290 uint8_t dn_next_nlevels[TXG_SIZE]; 291 uint8_t dn_next_indblkshift[TXG_SIZE]; 292 uint8_t dn_next_bonustype[TXG_SIZE]; 293 uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */ 294 uint16_t dn_next_bonuslen[TXG_SIZE]; 295 uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */ 296 uint64_t dn_next_maxblkid[TXG_SIZE]; /* next maxblkid in bytes */ 297 298 /* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */ 299 uint32_t dn_dbufs_count; /* count of dn_dbufs */ 300 301 /* protected by os_lock: */ 302 multilist_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */ 303 304 /* protected by dn_mtx: */ 305 kmutex_t dn_mtx; 306 list_t dn_dirty_records[TXG_SIZE]; 307 struct range_tree *dn_free_ranges[TXG_SIZE]; 308 uint64_t dn_allocated_txg; 309 uint64_t dn_free_txg; 310 uint64_t dn_assigned_txg; 311 uint64_t dn_dirty_txg; /* txg dnode was last dirtied */ 312 kcondvar_t dn_notxholds; 313 enum dnode_dirtycontext dn_dirtyctx; 314 uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */ 315 316 /* protected by own devices */ 317 zfs_refcount_t dn_tx_holds; 318 zfs_refcount_t dn_holds; 319 320 kmutex_t dn_dbufs_mtx; 321 /* 322 * Descendent dbufs, ordered by dbuf_compare. Note that dn_dbufs 323 * can contain multiple dbufs of the same (level, blkid) when a 324 * dbuf is marked DB_EVICTING without being removed from 325 * dn_dbufs. To maintain the avl invariant that there cannot be 326 * duplicate entries, we order the dbufs by an arbitrary value - 327 * their address in memory. This means that dn_dbufs cannot be used to 328 * directly look up a dbuf. Instead, callers must use avl_walk, have 329 * a reference to the dbuf, or look up a non-existant node with 330 * db_state = DB_SEARCH (see dbuf_free_range for an example). 331 */ 332 avl_tree_t dn_dbufs; 333 334 /* protected by dn_struct_rwlock */ 335 struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */ 336 337 boolean_t dn_have_spill; /* have spill or are spilling */ 338 339 /* parent IO for current sync write */ 340 zio_t *dn_zio; 341 342 /* used in syncing context */ 343 uint64_t dn_oldused; /* old phys used bytes */ 344 uint64_t dn_oldflags; /* old phys dn_flags */ 345 uint64_t dn_olduid, dn_oldgid, dn_oldprojid; 346 uint64_t dn_newuid, dn_newgid, dn_newprojid; 347 int dn_id_flags; 348 349 /* holds prefetch structure */ 350 struct zfetch dn_zfetch; 351 }; 352 353 /* 354 * We use this (otherwise unused) bit to indicate if the value of 355 * dn_next_maxblkid[txgoff] is valid to use in dnode_sync(). 356 */ 357 #define DMU_NEXT_MAXBLKID_SET (1ULL << 63) 358 359 /* 360 * Adds a level of indirection between the dbuf and the dnode to avoid 361 * iterating descendent dbufs in dnode_move(). Handles are not allocated 362 * individually, but as an array of child dnodes in dnode_hold_impl(). 363 */ 364 typedef struct dnode_handle { 365 /* Protects dnh_dnode from modification by dnode_move(). */ 366 zrlock_t dnh_zrlock; 367 dnode_t *dnh_dnode; 368 } dnode_handle_t; 369 370 typedef struct dnode_children { 371 dmu_buf_user_t dnc_dbu; /* User evict data */ 372 size_t dnc_count; /* number of children */ 373 dnode_handle_t dnc_children[]; /* sized dynamically */ 374 } dnode_children_t; 375 376 typedef struct free_range { 377 avl_node_t fr_node; 378 uint64_t fr_blkid; 379 uint64_t fr_nblks; 380 } free_range_t; 381 382 void dnode_special_open(struct objset *dd, dnode_phys_t *dnp, 383 uint64_t object, dnode_handle_t *dnh); 384 void dnode_special_close(dnode_handle_t *dnh); 385 386 void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx); 387 void dnode_setbonus_type(dnode_t *dn, dmu_object_type_t, dmu_tx_t *tx); 388 void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx); 389 390 int dnode_hold(struct objset *dd, uint64_t object, 391 void *ref, dnode_t **dnp); 392 int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, int dn_slots, 393 void *ref, dnode_t **dnp); 394 boolean_t dnode_add_ref(dnode_t *dn, void *ref); 395 void dnode_rele(dnode_t *dn, void *ref); 396 void dnode_rele_and_unlock(dnode_t *dn, void *tag, boolean_t evicting); 397 int dnode_try_claim(objset_t *os, uint64_t object, int slots); 398 void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx); 399 void dnode_sync(dnode_t *dn, dmu_tx_t *tx); 400 void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 401 dmu_object_type_t bonustype, int bonuslen, int dn_slots, dmu_tx_t *tx); 402 void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 403 dmu_object_type_t bonustype, int bonuslen, int dn_slots, 404 boolean_t keep_spill, dmu_tx_t *tx); 405 void dnode_free(dnode_t *dn, dmu_tx_t *tx); 406 void dnode_byteswap(dnode_phys_t *dnp); 407 void dnode_buf_byteswap(void *buf, size_t size); 408 void dnode_verify(dnode_t *dn); 409 int dnode_set_nlevels(dnode_t *dn, int nlevels, dmu_tx_t *tx); 410 int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx); 411 void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx); 412 void dnode_diduse_space(dnode_t *dn, int64_t space); 413 void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, 414 boolean_t have_read, boolean_t force); 415 uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid); 416 void dnode_init(void); 417 void dnode_fini(void); 418 int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off, 419 int minlvl, uint64_t blkfill, uint64_t txg); 420 void dnode_evict_dbufs(dnode_t *dn); 421 void dnode_evict_bonus(dnode_t *dn); 422 void dnode_free_interior_slots(dnode_t *dn); 423 boolean_t dnode_needs_remap(const dnode_t *dn); 424 425 #define DNODE_IS_DIRTY(_dn) \ 426 ((_dn)->dn_dirty_txg >= spa_syncing_txg((_dn)->dn_objset->os_spa)) 427 428 #define DNODE_IS_CACHEABLE(_dn) \ 429 ((_dn)->dn_objset->os_primary_cache == ZFS_CACHE_ALL || \ 430 (DMU_OT_IS_METADATA((_dn)->dn_type) && \ 431 (_dn)->dn_objset->os_primary_cache == ZFS_CACHE_METADATA)) 432 433 #define DNODE_META_IS_CACHEABLE(_dn) \ 434 ((_dn)->dn_objset->os_primary_cache == ZFS_CACHE_ALL || \ 435 (_dn)->dn_objset->os_primary_cache == ZFS_CACHE_METADATA) 436 437 /* 438 * Used for dnodestats kstat. 439 */ 440 typedef struct dnode_stats { 441 /* 442 * Number of failed attempts to hold a meta dnode dbuf. 443 */ 444 kstat_named_t dnode_hold_dbuf_hold; 445 /* 446 * Number of failed attempts to read a meta dnode dbuf. 447 */ 448 kstat_named_t dnode_hold_dbuf_read; 449 /* 450 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was able 451 * to hold the requested object number which was allocated. This is 452 * the common case when looking up any allocated object number. 453 */ 454 kstat_named_t dnode_hold_alloc_hits; 455 /* 456 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was not 457 * able to hold the request object number because it was not allocated. 458 */ 459 kstat_named_t dnode_hold_alloc_misses; 460 /* 461 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was not 462 * able to hold the request object number because the object number 463 * refers to an interior large dnode slot. 464 */ 465 kstat_named_t dnode_hold_alloc_interior; 466 /* 467 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) needed 468 * to retry acquiring slot zrl locks due to contention. 469 */ 470 kstat_named_t dnode_hold_alloc_lock_retry; 471 /* 472 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) did not 473 * need to create the dnode because another thread did so after 474 * dropping the read lock but before acquiring the write lock. 475 */ 476 kstat_named_t dnode_hold_alloc_lock_misses; 477 /* 478 * Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) found 479 * a free dnode instantiated by dnode_create() but not yet allocated 480 * by dnode_allocate(). 481 */ 482 kstat_named_t dnode_hold_alloc_type_none; 483 /* 484 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was able 485 * to hold the requested range of free dnode slots. 486 */ 487 kstat_named_t dnode_hold_free_hits; 488 /* 489 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was not 490 * able to hold the requested range of free dnode slots because 491 * at least one slot was allocated. 492 */ 493 kstat_named_t dnode_hold_free_misses; 494 /* 495 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was not 496 * able to hold the requested range of free dnode slots because 497 * after acquiring the zrl lock at least one slot was allocated. 498 */ 499 kstat_named_t dnode_hold_free_lock_misses; 500 /* 501 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) needed 502 * to retry acquiring slot zrl locks due to contention. 503 */ 504 kstat_named_t dnode_hold_free_lock_retry; 505 /* 506 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) requested 507 * a range of dnode slots which were held by another thread. 508 */ 509 kstat_named_t dnode_hold_free_refcount; 510 /* 511 * Number of times dnode_hold(..., DNODE_MUST_BE_FREE) requested 512 * a range of dnode slots which would overflow the dnode_phys_t. 513 */ 514 kstat_named_t dnode_hold_free_overflow; 515 /* 516 * Number of times dnode_free_interior_slots() needed to retry 517 * acquiring a slot zrl lock due to contention. 518 */ 519 kstat_named_t dnode_free_interior_lock_retry; 520 /* 521 * Number of new dnodes allocated by dnode_allocate(). 522 */ 523 kstat_named_t dnode_allocate; 524 /* 525 * Number of dnodes re-allocated by dnode_reallocate(). 526 */ 527 kstat_named_t dnode_reallocate; 528 /* 529 * Number of meta dnode dbufs evicted. 530 */ 531 kstat_named_t dnode_buf_evict; 532 /* 533 * Number of times dmu_object_alloc*() reached the end of the existing 534 * object ID chunk and advanced to a new one. 535 */ 536 kstat_named_t dnode_alloc_next_chunk; 537 /* 538 * Number of times multiple threads attempted to allocate a dnode 539 * from the same block of free dnodes. 540 */ 541 kstat_named_t dnode_alloc_race; 542 /* 543 * Number of times dmu_object_alloc*() was forced to advance to the 544 * next meta dnode dbuf due to an error from dmu_object_next(). 545 */ 546 kstat_named_t dnode_alloc_next_block; 547 /* 548 * Statistics for tracking dnodes which have been moved. 549 */ 550 kstat_named_t dnode_move_invalid; 551 kstat_named_t dnode_move_recheck1; 552 kstat_named_t dnode_move_recheck2; 553 kstat_named_t dnode_move_special; 554 kstat_named_t dnode_move_handle; 555 kstat_named_t dnode_move_rwlock; 556 kstat_named_t dnode_move_active; 557 } dnode_stats_t; 558 559 extern dnode_stats_t dnode_stats; 560 561 #define DNODE_STAT_INCR(stat, val) \ 562 atomic_add_64(&dnode_stats.stat.value.ui64, (val)); 563 #define DNODE_STAT_BUMP(stat) \ 564 DNODE_STAT_INCR(stat, 1); 565 566 #ifdef ZFS_DEBUG 567 568 /* 569 * There should be a ## between the string literal and fmt, to make it 570 * clear that we're joining two strings together, but that piece of shit 571 * gcc doesn't support that preprocessor token. 572 */ 573 #define dprintf_dnode(dn, fmt, ...) do { \ 574 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 575 char __db_buf[32]; \ 576 uint64_t __db_obj = (dn)->dn_object; \ 577 if (__db_obj == DMU_META_DNODE_OBJECT) \ 578 (void) strcpy(__db_buf, "mdn"); \ 579 else \ 580 (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \ 581 (u_longlong_t)__db_obj);\ 582 dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \ 583 __db_buf, __VA_ARGS__); \ 584 } \ 585 _NOTE(CONSTCOND) } while (0) 586 587 #define DNODE_VERIFY(dn) dnode_verify(dn) 588 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx) 589 590 #else 591 592 #define dprintf_dnode(db, fmt, ...) 593 #define DNODE_VERIFY(dn) 594 #define FREE_VERIFY(db, start, end, tx) 595 596 #endif 597 598 #ifdef __cplusplus 599 } 600 #endif 601 602 #endif /* _SYS_DNODE_H */ 603