2 * Copyright (c) 2002 McAfee, Inc.
5 * This software was developed for the FreeBSD Project by Marshall
6 * Kirk McKusick and McAfee Research,, the Security Research Division of
7 * McAfee, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as
8 * part of the DARPA CHATS research program
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * The contents of this file are subject to the terms of the
35 * Common Development and Distribution License (the "License").
36 * You may not use this file except in compliance with the License.
38 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
39 * or http://www.opensolaris.org/os/licensing.
40 * See the License for the specific language governing permissions
41 * and limitations under the License.
43 * When distributing Covered Code, include this CDDL HEADER in each
44 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
45 * If applicable, add the following below this CDDL HEADER, with the
46 * fields enclosed by brackets "[]" replaced with your own identifying
47 * information: Portions Copyright [yyyy] [name of copyright owner]
52 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
53 * Use is subject to license terms.
56 * Copyright 2013 by Saso Kiselkov. All rights reserved.
59 * Copyright (c) 2013 by Delphix. All rights reserved.
62 #define MAXNAMELEN 256
67 * AVL comparator helpers
69 #define AVL_ISIGN(a) (((a) > 0) - ((a) < 0))
70 #define AVL_CMP(a, b) (((a) > (b)) - ((a) < (b)))
71 #define AVL_PCMP(a, b) \
72 (((uintptr_t)(a) > (uintptr_t)(b)) - ((uintptr_t)(a) < (uintptr_t)(b)))
74 typedef enum { B_FALSE, B_TRUE } boolean_t;
77 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
80 * Macros for various sorts of alignment and rounding when the alignment
81 * is known to be a power of 2.
83 #define P2ALIGN(x, align) ((x) & -(align))
84 #define P2PHASE(x, align) ((x) & ((align) - 1))
85 #define P2NPHASE(x, align) (-(x) & ((align) - 1))
86 #define P2ROUNDUP(x, align) (-(-(x) & -(align)))
87 #define P2END(x, align) (-(~(x) & -(align)))
88 #define P2PHASEUP(x, align, phase) ((phase) - (((phase) - (x)) & -(align)))
89 #define P2BOUNDARY(off, len, align) (((off) ^ ((off) + (len) - 1)) > (align) - 1)
92 * General-purpose 32-bit and 64-bit bitfield encodings.
94 #define BF32_DECODE(x, low, len) P2PHASE((x) >> (low), 1U << (len))
95 #define BF64_DECODE(x, low, len) P2PHASE((x) >> (low), 1ULL << (len))
96 #define BF32_ENCODE(x, low, len) (P2PHASE((x), 1U << (len)) << (low))
97 #define BF64_ENCODE(x, low, len) (P2PHASE((x), 1ULL << (len)) << (low))
99 #define BF32_GET(x, low, len) BF32_DECODE(x, low, len)
100 #define BF64_GET(x, low, len) BF64_DECODE(x, low, len)
102 #define BF32_SET(x, low, len, val) \
103 ((x) ^= BF32_ENCODE((x >> low) ^ (val), low, len))
104 #define BF64_SET(x, low, len, val) \
105 ((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len))
107 #define BF32_GET_SB(x, low, len, shift, bias) \
108 ((BF32_GET(x, low, len) + (bias)) << (shift))
109 #define BF64_GET_SB(x, low, len, shift, bias) \
110 ((BF64_GET(x, low, len) + (bias)) << (shift))
112 #define BF32_SET_SB(x, low, len, shift, bias, val) \
113 BF32_SET(x, low, len, ((val) >> (shift)) - (bias))
114 #define BF64_SET_SB(x, low, len, shift, bias, val) \
115 BF64_SET(x, low, len, ((val) >> (shift)) - (bias))
118 * Macros to reverse byte order
120 #define BSWAP_8(x) ((x) & 0xff)
121 #define BSWAP_16(x) ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
122 #define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
123 #define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
125 #define SPA_MINBLOCKSHIFT 9
126 #define SPA_OLDMAXBLOCKSHIFT 17
127 #define SPA_MAXBLOCKSHIFT 24
128 #define SPA_MINBLOCKSIZE (1ULL << SPA_MINBLOCKSHIFT)
129 #define SPA_OLDMAXBLOCKSIZE (1ULL << SPA_OLDMAXBLOCKSHIFT)
130 #define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT)
133 * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
134 * The ASIZE encoding should be at least 64 times larger (6 more bits)
135 * to support up to 4-way RAID-Z mirror mode with worst-case gang block
136 * overhead, three DVAs per bp, plus one more bit in case we do anything
137 * else that expands the ASIZE.
139 #define SPA_LSIZEBITS 16 /* LSIZE up to 32M (2^16 * 512) */
140 #define SPA_PSIZEBITS 16 /* PSIZE up to 32M (2^16 * 512) */
141 #define SPA_ASIZEBITS 24 /* ASIZE up to 64 times larger */
144 * All SPA data is represented by 128-bit data virtual addresses (DVAs).
145 * The members of the dva_t should be considered opaque outside the SPA.
148 uint64_t dva_word[2];
152 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
154 typedef struct zio_cksum {
159 * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
160 * secret and is suitable for use in MAC algorithms as the key.
162 typedef struct zio_cksum_salt {
163 uint8_t zcs_bytes[32];
167 * Each block is described by its DVAs, time of birth, checksum, etc.
168 * The word-by-word, bit-by-bit layout of the blkptr is as follows:
170 * 64 56 48 40 32 24 16 8 0
171 * +-------+-------+-------+-------+-------+-------+-------+-------+
172 * 0 | vdev1 | GRID | ASIZE |
173 * +-------+-------+-------+-------+-------+-------+-------+-------+
175 * +-------+-------+-------+-------+-------+-------+-------+-------+
176 * 2 | vdev2 | GRID | ASIZE |
177 * +-------+-------+-------+-------+-------+-------+-------+-------+
179 * +-------+-------+-------+-------+-------+-------+-------+-------+
180 * 4 | vdev3 | GRID | ASIZE |
181 * +-------+-------+-------+-------+-------+-------+-------+-------+
183 * +-------+-------+-------+-------+-------+-------+-------+-------+
184 * 6 |BDX|lvl| type | cksum |E| comp| PSIZE | LSIZE |
185 * +-------+-------+-------+-------+-------+-------+-------+-------+
187 * +-------+-------+-------+-------+-------+-------+-------+-------+
189 * +-------+-------+-------+-------+-------+-------+-------+-------+
190 * 9 | physical birth txg |
191 * +-------+-------+-------+-------+-------+-------+-------+-------+
192 * a | logical birth txg |
193 * +-------+-------+-------+-------+-------+-------+-------+-------+
195 * +-------+-------+-------+-------+-------+-------+-------+-------+
197 * +-------+-------+-------+-------+-------+-------+-------+-------+
199 * +-------+-------+-------+-------+-------+-------+-------+-------+
201 * +-------+-------+-------+-------+-------+-------+-------+-------+
203 * +-------+-------+-------+-------+-------+-------+-------+-------+
207 * vdev virtual device ID
208 * offset offset into virtual device
210 * PSIZE physical size (after compression)
211 * ASIZE allocated size (including RAID-Z parity and gang block headers)
212 * GRID RAID-Z layout information (reserved for future use)
213 * cksum checksum function
214 * comp compression function
215 * G gang block indicator
216 * B byteorder (endianness)
218 * X encryption (on version 30, which is not supported)
219 * E blkptr_t contains embedded data (see below)
220 * lvl level of indirection
221 * type DMU object type
222 * phys birth txg of block allocation; zero if same as logical birth txg
223 * log. birth transaction group in which the block was logically born
224 * fill count number of non-zero blocks under this bp
225 * checksum[4] 256-bit checksum of the data this bp describes
229 * "Embedded" blkptr_t's don't actually point to a block, instead they
230 * have a data payload embedded in the blkptr_t itself. See the comment
231 * in blkptr.c for more details.
233 * The blkptr_t is laid out as follows:
235 * 64 56 48 40 32 24 16 8 0
236 * +-------+-------+-------+-------+-------+-------+-------+-------+
243 * +-------+-------+-------+-------+-------+-------+-------+-------+
244 * 6 |BDX|lvl| type | etype |E| comp| PSIZE| LSIZE |
245 * +-------+-------+-------+-------+-------+-------+-------+-------+
249 * +-------+-------+-------+-------+-------+-------+-------+-------+
250 * a | logical birth txg |
251 * +-------+-------+-------+-------+-------+-------+-------+-------+
257 * +-------+-------+-------+-------+-------+-------+-------+-------+
261 * payload contains the embedded data
262 * B (byteorder) byteorder (endianness)
263 * D (dedup) padding (set to zero)
264 * X encryption (set to zero; see above)
265 * E (embedded) set to one
266 * lvl indirection level
267 * type DMU object type
268 * etype how to interpret embedded data (BP_EMBEDDED_TYPE_*)
269 * comp compression function of payload
270 * PSIZE size of payload after compression, in bytes
271 * LSIZE logical size of payload, in bytes
272 * note that 25 bits is enough to store the largest
273 * "normal" BP's LSIZE (2^16 * 2^9) in bytes
274 * log. birth transaction group in which the block was logically born
276 * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
277 * bp's they are stored in units of SPA_MINBLOCKSHIFT.
278 * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
279 * The B, D, X, lvl, type, and comp fields are stored the same as with normal
280 * BP's so the BP_SET_* macros can be used with them. etype, PSIZE, LSIZE must
281 * be set with the BPE_SET_* macros. BP_SET_EMBEDDED() should be called before
282 * other macros, as they assert that they are only used on BP's of the correct
286 #define BPE_GET_ETYPE(bp) \
287 (ASSERT(BP_IS_EMBEDDED(bp)), \
288 BF64_GET((bp)->blk_prop, 40, 8))
289 #define BPE_SET_ETYPE(bp, t) do { \
290 ASSERT(BP_IS_EMBEDDED(bp)); \
291 BF64_SET((bp)->blk_prop, 40, 8, t); \
292 _NOTE(CONSTCOND) } while (0)
294 #define BPE_GET_LSIZE(bp) \
295 (ASSERT(BP_IS_EMBEDDED(bp)), \
296 BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
297 #define BPE_SET_LSIZE(bp, x) do { \
298 ASSERT(BP_IS_EMBEDDED(bp)); \
299 BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
300 _NOTE(CONSTCOND) } while (0)
302 #define BPE_GET_PSIZE(bp) \
303 (ASSERT(BP_IS_EMBEDDED(bp)), \
304 BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
305 #define BPE_SET_PSIZE(bp, x) do { \
306 ASSERT(BP_IS_EMBEDDED(bp)); \
307 BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
308 _NOTE(CONSTCOND) } while (0)
310 typedef enum bp_embedded_type {
311 BP_EMBEDDED_TYPE_DATA,
312 BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
313 NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
314 } bp_embedded_type_t;
316 #define BPE_NUM_WORDS 14
317 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
318 #define BPE_IS_PAYLOADWORD(bp, wp) \
319 ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
321 #define SPA_BLKPTRSHIFT 7 /* blkptr_t is 128 bytes */
322 #define SPA_DVAS_PER_BP 3 /* Number of DVAs in a bp */
324 typedef struct blkptr {
325 dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
326 uint64_t blk_prop; /* size, compression, type, etc */
327 uint64_t blk_pad[2]; /* Extra space for the future */
328 uint64_t blk_phys_birth; /* txg when block was allocated */
329 uint64_t blk_birth; /* transaction group at birth */
330 uint64_t blk_fill; /* fill count */
331 zio_cksum_t blk_cksum; /* 256-bit checksum */
335 * Macros to get and set fields in a bp or DVA.
337 #define DVA_GET_ASIZE(dva) \
338 BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
339 #define DVA_SET_ASIZE(dva, x) \
340 BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
341 SPA_MINBLOCKSHIFT, 0, x)
343 #define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8)
344 #define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x)
346 #define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, 32)
347 #define DVA_SET_VDEV(dva, x) BF64_SET((dva)->dva_word[0], 32, 32, x)
349 #define DVA_GET_OFFSET(dva) \
350 BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
351 #define DVA_SET_OFFSET(dva, x) \
352 BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
354 #define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1)
355 #define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x)
357 #define BP_GET_LSIZE(bp) \
358 (BP_IS_EMBEDDED(bp) ? \
359 (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
360 BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
361 #define BP_SET_LSIZE(bp, x) do { \
362 ASSERT(!BP_IS_EMBEDDED(bp)); \
363 BF64_SET_SB((bp)->blk_prop, \
364 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
365 _NOTE(CONSTCOND) } while (0)
367 #define BP_GET_PSIZE(bp) \
368 BF64_GET_SB((bp)->blk_prop, 16, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1)
369 #define BP_SET_PSIZE(bp, x) \
370 BF64_SET_SB((bp)->blk_prop, 16, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x)
372 #define BP_GET_COMPRESS(bp) BF64_GET((bp)->blk_prop, 32, 7)
373 #define BP_SET_COMPRESS(bp, x) BF64_SET((bp)->blk_prop, 32, 7, x)
375 #define BP_GET_CHECKSUM(bp) BF64_GET((bp)->blk_prop, 40, 8)
376 #define BP_SET_CHECKSUM(bp, x) BF64_SET((bp)->blk_prop, 40, 8, x)
378 #define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8)
379 #define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x)
381 #define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5)
382 #define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x)
384 #define BP_IS_EMBEDDED(bp) BF64_GET((bp)->blk_prop, 39, 1)
386 #define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1)
387 #define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, x)
389 #define BP_GET_BYTEORDER(bp) BF64_GET((bp)->blk_prop, 63, 1)
390 #define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x)
392 #define BP_PHYSICAL_BIRTH(bp) \
393 ((bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
395 #define BP_GET_ASIZE(bp) \
396 (DVA_GET_ASIZE(&(bp)->blk_dva[0]) + DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
397 DVA_GET_ASIZE(&(bp)->blk_dva[2]))
399 #define BP_GET_UCSIZE(bp) \
400 ((BP_GET_LEVEL(bp) > 0 || dmu_ot[BP_GET_TYPE(bp)].ot_metadata) ? \
401 BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp));
403 #define BP_GET_NDVAS(bp) \
404 (!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
405 !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
406 !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
408 #define DVA_EQUAL(dva1, dva2) \
409 ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
410 (dva1)->dva_word[0] == (dva2)->dva_word[0])
412 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
413 (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
414 ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
415 ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
416 ((zc1).zc_word[3] - (zc2).zc_word[3])))
419 #define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0)
421 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
423 (zcp)->zc_word[0] = w0; \
424 (zcp)->zc_word[1] = w1; \
425 (zcp)->zc_word[2] = w2; \
426 (zcp)->zc_word[3] = w3; \
429 #define BP_IDENTITY(bp) (&(bp)->blk_dva[0])
430 #define BP_IS_GANG(bp) DVA_GET_GANG(BP_IDENTITY(bp))
431 #define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \
432 (dva)->dva_word[1] == 0ULL)
433 #define BP_IS_HOLE(bp) DVA_IS_EMPTY(BP_IDENTITY(bp))
434 #define BP_IS_OLDER(bp, txg) (!BP_IS_HOLE(bp) && (bp)->blk_birth < (txg))
436 #define BP_ZERO(bp) \
438 (bp)->blk_dva[0].dva_word[0] = 0; \
439 (bp)->blk_dva[0].dva_word[1] = 0; \
440 (bp)->blk_dva[1].dva_word[0] = 0; \
441 (bp)->blk_dva[1].dva_word[1] = 0; \
442 (bp)->blk_dva[2].dva_word[0] = 0; \
443 (bp)->blk_dva[2].dva_word[1] = 0; \
444 (bp)->blk_prop = 0; \
445 (bp)->blk_pad[0] = 0; \
446 (bp)->blk_pad[1] = 0; \
447 (bp)->blk_phys_birth = 0; \
448 (bp)->blk_birth = 0; \
449 (bp)->blk_fill = 0; \
450 ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
453 #if BYTE_ORDER == _BIG_ENDIAN
454 #define ZFS_HOST_BYTEORDER (0ULL)
456 #define ZFS_HOST_BYTEORDER (1ULL)
459 #define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
460 #define BPE_NUM_WORDS 14
461 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
462 #define BPE_IS_PAYLOADWORD(bp, wp) \
463 ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
468 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
470 typedef struct zio_eck {
471 uint64_t zec_magic; /* for validation, endianness */
472 zio_cksum_t zec_cksum; /* 256-bit checksum */
476 * Gang block headers are self-checksumming and contain an array
479 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
480 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
481 sizeof (zio_eck_t)) / sizeof (blkptr_t))
482 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
483 sizeof (zio_eck_t) - \
484 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
487 typedef struct zio_gbh {
488 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
489 uint64_t zg_filler[SPA_GBH_FILLER];
493 #define VDEV_RAIDZ_MAXPARITY 3
495 #define VDEV_PAD_SIZE (8 << 10)
496 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
497 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
498 #define VDEV_PHYS_SIZE (112 << 10)
499 #define VDEV_UBERBLOCK_RING (128 << 10)
502 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
503 * ring when MMP is enabled.
505 #define MMP_BLOCKS_PER_LABEL 1
507 /* The largest uberblock we support is 8k. */
508 #define MAX_UBERBLOCK_SHIFT (13)
509 #define VDEV_UBERBLOCK_SHIFT(vd) \
510 MIN(MAX((vd)->v_top->v_ashift, UBERBLOCK_SHIFT), MAX_UBERBLOCK_SHIFT)
511 #define VDEV_UBERBLOCK_COUNT(vd) \
512 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
513 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
514 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
515 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
517 typedef struct vdev_phys {
518 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
522 typedef struct vdev_label {
523 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
524 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
525 vdev_phys_t vl_vdev_phys; /* 112K */
526 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
527 } vdev_label_t; /* 256K total */
532 #define VDD_METASLAB 0x01
536 * Size and offset of embedded boot loader region on each label.
537 * The total size of the first two labels plus the boot area is 4MB.
539 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
540 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
543 * Size of label regions at the start and end of each leaf device.
545 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
546 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
547 #define VDEV_LABELS 4
550 ZIO_CHECKSUM_INHERIT = 0,
554 ZIO_CHECKSUM_GANG_HEADER,
556 ZIO_CHECKSUM_FLETCHER_2,
557 ZIO_CHECKSUM_FLETCHER_4,
560 ZIO_CHECKSUM_NOPARITY,
564 ZIO_CHECKSUM_FUNCTIONS
567 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
568 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
571 ZIO_COMPRESS_INHERIT = 0,
587 ZIO_COMPRESS_FUNCTIONS
590 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
591 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
593 /* nvlist pack encoding */
594 #define NV_ENCODE_NATIVE 0
595 #define NV_ENCODE_XDR 1
598 DATA_TYPE_UNKNOWN = 0,
608 DATA_TYPE_BYTE_ARRAY,
609 DATA_TYPE_INT16_ARRAY,
610 DATA_TYPE_UINT16_ARRAY,
611 DATA_TYPE_INT32_ARRAY,
612 DATA_TYPE_UINT32_ARRAY,
613 DATA_TYPE_INT64_ARRAY,
614 DATA_TYPE_UINT64_ARRAY,
615 DATA_TYPE_STRING_ARRAY,
618 DATA_TYPE_NVLIST_ARRAY,
619 DATA_TYPE_BOOLEAN_VALUE,
622 DATA_TYPE_BOOLEAN_ARRAY,
623 DATA_TYPE_INT8_ARRAY,
624 DATA_TYPE_UINT8_ARRAY
628 * On-disk version number.
630 #define SPA_VERSION_1 1ULL
631 #define SPA_VERSION_2 2ULL
632 #define SPA_VERSION_3 3ULL
633 #define SPA_VERSION_4 4ULL
634 #define SPA_VERSION_5 5ULL
635 #define SPA_VERSION_6 6ULL
636 #define SPA_VERSION_7 7ULL
637 #define SPA_VERSION_8 8ULL
638 #define SPA_VERSION_9 9ULL
639 #define SPA_VERSION_10 10ULL
640 #define SPA_VERSION_11 11ULL
641 #define SPA_VERSION_12 12ULL
642 #define SPA_VERSION_13 13ULL
643 #define SPA_VERSION_14 14ULL
644 #define SPA_VERSION_15 15ULL
645 #define SPA_VERSION_16 16ULL
646 #define SPA_VERSION_17 17ULL
647 #define SPA_VERSION_18 18ULL
648 #define SPA_VERSION_19 19ULL
649 #define SPA_VERSION_20 20ULL
650 #define SPA_VERSION_21 21ULL
651 #define SPA_VERSION_22 22ULL
652 #define SPA_VERSION_23 23ULL
653 #define SPA_VERSION_24 24ULL
654 #define SPA_VERSION_25 25ULL
655 #define SPA_VERSION_26 26ULL
656 #define SPA_VERSION_27 27ULL
657 #define SPA_VERSION_28 28ULL
658 #define SPA_VERSION_5000 5000ULL
661 * When bumping up SPA_VERSION, make sure GRUB ZFS understands the on-disk
662 * format change. Go to usr/src/grub/grub-0.97/stage2/{zfs-include/, fsys_zfs*},
663 * and do the appropriate changes. Also bump the version number in
664 * usr/src/grub/capability.
666 #define SPA_VERSION SPA_VERSION_5000
667 #define SPA_VERSION_STRING "5000"
670 * Symbolic names for the changes that caused a SPA_VERSION switch.
671 * Used in the code when checking for presence or absence of a feature.
672 * Feel free to define multiple symbolic names for each version if there
673 * were multiple changes to on-disk structures during that version.
675 * NOTE: When checking the current SPA_VERSION in your code, be sure
676 * to use spa_version() since it reports the version of the
677 * last synced uberblock. Checking the in-flight version can
678 * be dangerous in some cases.
680 #define SPA_VERSION_INITIAL SPA_VERSION_1
681 #define SPA_VERSION_DITTO_BLOCKS SPA_VERSION_2
682 #define SPA_VERSION_SPARES SPA_VERSION_3
683 #define SPA_VERSION_RAID6 SPA_VERSION_3
684 #define SPA_VERSION_BPLIST_ACCOUNT SPA_VERSION_3
685 #define SPA_VERSION_RAIDZ_DEFLATE SPA_VERSION_3
686 #define SPA_VERSION_DNODE_BYTES SPA_VERSION_3
687 #define SPA_VERSION_ZPOOL_HISTORY SPA_VERSION_4
688 #define SPA_VERSION_GZIP_COMPRESSION SPA_VERSION_5
689 #define SPA_VERSION_BOOTFS SPA_VERSION_6
690 #define SPA_VERSION_SLOGS SPA_VERSION_7
691 #define SPA_VERSION_DELEGATED_PERMS SPA_VERSION_8
692 #define SPA_VERSION_FUID SPA_VERSION_9
693 #define SPA_VERSION_REFRESERVATION SPA_VERSION_9
694 #define SPA_VERSION_REFQUOTA SPA_VERSION_9
695 #define SPA_VERSION_UNIQUE_ACCURATE SPA_VERSION_9
696 #define SPA_VERSION_L2CACHE SPA_VERSION_10
697 #define SPA_VERSION_NEXT_CLONES SPA_VERSION_11
698 #define SPA_VERSION_ORIGIN SPA_VERSION_11
699 #define SPA_VERSION_DSL_SCRUB SPA_VERSION_11
700 #define SPA_VERSION_SNAP_PROPS SPA_VERSION_12
701 #define SPA_VERSION_USED_BREAKDOWN SPA_VERSION_13
702 #define SPA_VERSION_PASSTHROUGH_X SPA_VERSION_14
703 #define SPA_VERSION_USERSPACE SPA_VERSION_15
704 #define SPA_VERSION_STMF_PROP SPA_VERSION_16
705 #define SPA_VERSION_RAIDZ3 SPA_VERSION_17
706 #define SPA_VERSION_USERREFS SPA_VERSION_18
707 #define SPA_VERSION_HOLES SPA_VERSION_19
708 #define SPA_VERSION_ZLE_COMPRESSION SPA_VERSION_20
709 #define SPA_VERSION_DEDUP SPA_VERSION_21
710 #define SPA_VERSION_RECVD_PROPS SPA_VERSION_22
711 #define SPA_VERSION_SLIM_ZIL SPA_VERSION_23
712 #define SPA_VERSION_SA SPA_VERSION_24
713 #define SPA_VERSION_SCAN SPA_VERSION_25
714 #define SPA_VERSION_DIR_CLONES SPA_VERSION_26
715 #define SPA_VERSION_DEADLISTS SPA_VERSION_26
716 #define SPA_VERSION_FAST_SNAP SPA_VERSION_27
717 #define SPA_VERSION_MULTI_REPLACE SPA_VERSION_28
718 #define SPA_VERSION_BEFORE_FEATURES SPA_VERSION_28
719 #define SPA_VERSION_FEATURES SPA_VERSION_5000
721 #define SPA_VERSION_IS_SUPPORTED(v) \
722 (((v) >= SPA_VERSION_INITIAL && (v) <= SPA_VERSION_BEFORE_FEATURES) || \
723 ((v) >= SPA_VERSION_FEATURES && (v) <= SPA_VERSION))
726 * The following are configuration names used in the nvlist describing a pool's
729 #define ZPOOL_CONFIG_VERSION "version"
730 #define ZPOOL_CONFIG_POOL_NAME "name"
731 #define ZPOOL_CONFIG_POOL_STATE "state"
732 #define ZPOOL_CONFIG_POOL_TXG "txg"
733 #define ZPOOL_CONFIG_POOL_GUID "pool_guid"
734 #define ZPOOL_CONFIG_CREATE_TXG "create_txg"
735 #define ZPOOL_CONFIG_TOP_GUID "top_guid"
736 #define ZPOOL_CONFIG_VDEV_TREE "vdev_tree"
737 #define ZPOOL_CONFIG_TYPE "type"
738 #define ZPOOL_CONFIG_CHILDREN "children"
739 #define ZPOOL_CONFIG_ID "id"
740 #define ZPOOL_CONFIG_GUID "guid"
741 #define ZPOOL_CONFIG_INDIRECT_OBJECT "com.delphix:indirect_object"
742 #define ZPOOL_CONFIG_INDIRECT_BIRTHS "com.delphix:indirect_births"
743 #define ZPOOL_CONFIG_PREV_INDIRECT_VDEV "com.delphix:prev_indirect_vdev"
744 #define ZPOOL_CONFIG_PATH "path"
745 #define ZPOOL_CONFIG_DEVID "devid"
746 #define ZPOOL_CONFIG_METASLAB_ARRAY "metaslab_array"
747 #define ZPOOL_CONFIG_METASLAB_SHIFT "metaslab_shift"
748 #define ZPOOL_CONFIG_ASHIFT "ashift"
749 #define ZPOOL_CONFIG_ASIZE "asize"
750 #define ZPOOL_CONFIG_DTL "DTL"
751 #define ZPOOL_CONFIG_STATS "stats"
752 #define ZPOOL_CONFIG_WHOLE_DISK "whole_disk"
753 #define ZPOOL_CONFIG_ERRCOUNT "error_count"
754 #define ZPOOL_CONFIG_NOT_PRESENT "not_present"
755 #define ZPOOL_CONFIG_SPARES "spares"
756 #define ZPOOL_CONFIG_IS_SPARE "is_spare"
757 #define ZPOOL_CONFIG_NPARITY "nparity"
758 #define ZPOOL_CONFIG_HOSTID "hostid"
759 #define ZPOOL_CONFIG_HOSTNAME "hostname"
760 #define ZPOOL_CONFIG_IS_LOG "is_log"
761 #define ZPOOL_CONFIG_TIMESTAMP "timestamp" /* not stored on disk */
762 #define ZPOOL_CONFIG_FEATURES_FOR_READ "features_for_read"
763 #define ZPOOL_CONFIG_VDEV_CHILDREN "vdev_children"
766 * The persistent vdev state is stored as separate values rather than a single
767 * 'vdev_state' entry. This is because a device can be in multiple states, such
768 * as offline and degraded.
770 #define ZPOOL_CONFIG_OFFLINE "offline"
771 #define ZPOOL_CONFIG_FAULTED "faulted"
772 #define ZPOOL_CONFIG_DEGRADED "degraded"
773 #define ZPOOL_CONFIG_REMOVED "removed"
774 #define ZPOOL_CONFIG_FRU "fru"
775 #define ZPOOL_CONFIG_AUX_STATE "aux_state"
777 #define VDEV_TYPE_ROOT "root"
778 #define VDEV_TYPE_MIRROR "mirror"
779 #define VDEV_TYPE_REPLACING "replacing"
780 #define VDEV_TYPE_RAIDZ "raidz"
781 #define VDEV_TYPE_DISK "disk"
782 #define VDEV_TYPE_FILE "file"
783 #define VDEV_TYPE_MISSING "missing"
784 #define VDEV_TYPE_HOLE "hole"
785 #define VDEV_TYPE_SPARE "spare"
786 #define VDEV_TYPE_LOG "log"
787 #define VDEV_TYPE_L2CACHE "l2cache"
788 #define VDEV_TYPE_INDIRECT "indirect"
791 * This is needed in userland to report the minimum necessary device size.
793 #define SPA_MINDEVSIZE (64ULL << 20)
796 * The location of the pool configuration repository, shared between kernel and
799 #define ZPOOL_CACHE "/boot/zfs/zpool.cache"
802 * vdev states are ordered from least to most healthy.
803 * A vdev that's CANT_OPEN or below is considered unusable.
805 typedef enum vdev_state {
806 VDEV_STATE_UNKNOWN = 0, /* Uninitialized vdev */
807 VDEV_STATE_CLOSED, /* Not currently open */
808 VDEV_STATE_OFFLINE, /* Not allowed to open */
809 VDEV_STATE_REMOVED, /* Explicitly removed from system */
810 VDEV_STATE_CANT_OPEN, /* Tried to open, but failed */
811 VDEV_STATE_FAULTED, /* External request to fault device */
812 VDEV_STATE_DEGRADED, /* Replicated vdev with unhealthy kids */
813 VDEV_STATE_HEALTHY /* Presumed good */
817 * vdev aux states. When a vdev is in the CANT_OPEN state, the aux field
818 * of the vdev stats structure uses these constants to distinguish why.
820 typedef enum vdev_aux {
821 VDEV_AUX_NONE, /* no error */
822 VDEV_AUX_OPEN_FAILED, /* ldi_open_*() or vn_open() failed */
823 VDEV_AUX_CORRUPT_DATA, /* bad label or disk contents */
824 VDEV_AUX_NO_REPLICAS, /* insufficient number of replicas */
825 VDEV_AUX_BAD_GUID_SUM, /* vdev guid sum doesn't match */
826 VDEV_AUX_TOO_SMALL, /* vdev size is too small */
827 VDEV_AUX_BAD_LABEL, /* the label is OK but invalid */
828 VDEV_AUX_VERSION_NEWER, /* on-disk version is too new */
829 VDEV_AUX_VERSION_OLDER, /* on-disk version is too old */
830 VDEV_AUX_SPARED /* hot spare used in another pool */
834 * pool state. The following states are written to disk as part of the normal
835 * SPA lifecycle: ACTIVE, EXPORTED, DESTROYED, SPARE. The remaining states are
836 * software abstractions used at various levels to communicate pool state.
838 typedef enum pool_state {
839 POOL_STATE_ACTIVE = 0, /* In active use */
840 POOL_STATE_EXPORTED, /* Explicitly exported */
841 POOL_STATE_DESTROYED, /* Explicitly destroyed */
842 POOL_STATE_SPARE, /* Reserved for hot spare use */
843 POOL_STATE_UNINITIALIZED, /* Internal spa_t state */
844 POOL_STATE_UNAVAIL, /* Internal libzfs state */
845 POOL_STATE_POTENTIALLY_ACTIVE /* Internal libzfs state */
849 * The uberblock version is incremented whenever an incompatible on-disk
850 * format change is made to the SPA, DMU, or ZAP.
852 * Note: the first two fields should never be moved. When a storage pool
853 * is opened, the uberblock must be read off the disk before the version
854 * can be checked. If the ub_version field is moved, we may not detect
855 * version mismatch. If the ub_magic field is moved, applications that
856 * expect the magic number in the first word won't work.
858 #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
859 #define UBERBLOCK_SHIFT 10 /* up to 1K */
861 #define MMP_MAGIC 0xa11cea11 /* all-see-all */
863 #define MMP_INTERVAL_VALID_BIT 0x01
864 #define MMP_SEQ_VALID_BIT 0x02
865 #define MMP_FAIL_INT_VALID_BIT 0x04
867 #define MMP_VALID(ubp) (ubp->ub_magic == UBERBLOCK_MAGIC && \
868 ubp->ub_mmp_magic == MMP_MAGIC)
869 #define MMP_INTERVAL_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \
870 MMP_INTERVAL_VALID_BIT))
871 #define MMP_SEQ_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \
873 #define MMP_FAIL_INT_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \
874 MMP_FAIL_INT_VALID_BIT))
876 #define MMP_INTERVAL(ubp) ((ubp->ub_mmp_config & 0x00000000FFFFFF00) \
878 #define MMP_SEQ(ubp) ((ubp->ub_mmp_config & 0x0000FFFF00000000) \
880 #define MMP_FAIL_INT(ubp) ((ubp->ub_mmp_config & 0xFFFF000000000000) \
883 typedef struct uberblock {
884 uint64_t ub_magic; /* UBERBLOCK_MAGIC */
885 uint64_t ub_version; /* SPA_VERSION */
886 uint64_t ub_txg; /* txg of last sync */
887 uint64_t ub_guid_sum; /* sum of all vdev guids */
888 uint64_t ub_timestamp; /* UTC time of last sync */
889 blkptr_t ub_rootbp; /* MOS objset_phys_t */
890 /* highest SPA_VERSION supported by software that wrote this txg */
891 uint64_t ub_software_version;
892 /* Maybe missing in uberblocks we read, but always written */
893 uint64_t ub_mmp_magic;
895 * If ub_mmp_delay == 0 and ub_mmp_magic is valid, MMP is off.
896 * Otherwise, nanosec since last MMP write.
898 uint64_t ub_mmp_delay;
901 * The ub_mmp_config contains the multihost write interval, multihost
902 * fail intervals, sequence number for sub-second granularity, and
903 * valid bit mask. This layout is as follows:
905 * 64 56 48 40 32 24 16 8 0
906 * +-------+-------+-------+-------+-------+-------+-------+-------+
907 * 0 | Fail Intervals| Seq | Write Interval (ms) | VALID |
908 * +-------+-------+-------+-------+-------+-------+-------+-------+
910 * This allows a write_interval of (2^24/1000)s, over 4.5 hours
913 * - 0x01 - Write Interval (ms)
914 * - 0x02 - Sequence number exists
915 * - 0x04 - Fail Intervals
918 uint64_t ub_mmp_config;
921 * ub_checkpoint_txg indicates two things about the current uberblock:
923 * 1] If it is not zero then this uberblock is a checkpoint. If it is
924 * zero, then this uberblock is not a checkpoint.
926 * 2] On checkpointed uberblocks, the value of ub_checkpoint_txg is
927 * the ub_txg that the uberblock had at the time we moved it to
930 * The field is set when we checkpoint the uberblock and continues to
931 * hold that value even after we've rewound (unlike the ub_txg that
932 * is reset to a higher value).
934 * Besides checks used to determine whether we are reopening the
935 * pool from a checkpointed uberblock [see spa_ld_select_uberblock()],
936 * the value of the field is used to determine which ZIL blocks have
937 * been allocated according to the ms_sm when we are rewinding to a
938 * checkpoint. Specifically, if blk_birth > ub_checkpoint_txg, then
939 * the ZIL block is not allocated [see uses of spa_min_claim_txg()].
941 uint64_t ub_checkpoint_txg;
947 #define DNODE_MUST_BE_ALLOCATED 1
948 #define DNODE_MUST_BE_FREE 2
953 #define DNODE_SHIFT 9 /* 512 bytes */
954 #define DN_MIN_INDBLKSHIFT 12 /* 4k */
955 #define DN_MAX_INDBLKSHIFT 17 /* 128k */
956 #define DNODE_BLOCK_SHIFT 14 /* 16k */
957 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
958 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
959 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
964 #define DNODE_MIN_SIZE (1 << DNODE_SHIFT)
965 #define DNODE_MAX_SIZE (1 << DNODE_BLOCK_SHIFT)
966 #define DNODE_BLOCK_SIZE (1 << DNODE_BLOCK_SHIFT)
967 #define DNODE_MIN_SLOTS (DNODE_MIN_SIZE >> DNODE_SHIFT)
968 #define DNODE_MAX_SLOTS (DNODE_MAX_SIZE >> DNODE_SHIFT)
969 #define DN_BONUS_SIZE(dnsize) ((dnsize) - DNODE_CORE_SIZE - \
970 (1 << SPA_BLKPTRSHIFT))
971 #define DN_SLOTS_TO_BONUSLEN(slots) DN_BONUS_SIZE((slots) << DNODE_SHIFT)
972 #define DN_OLD_MAX_BONUSLEN (DN_BONUS_SIZE(DNODE_MIN_SIZE))
973 #define DN_MAX_NBLKPTR ((DNODE_MIN_SIZE - DNODE_CORE_SIZE) >> \
975 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
976 #define DN_ZERO_BONUSLEN (DN_BONUS_SIZE(DNODE_MAX_SIZE) + 1)
978 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
979 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
980 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
982 /* The +2 here is a cheesy way to round up */
983 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
984 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
986 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
987 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
989 #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
990 (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)
992 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))
994 /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
995 #define DNODE_FLAG_USED_BYTES (1<<0)
996 #define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1)
998 /* Does dnode have a SA spill blkptr in bonus? */
999 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
1001 typedef struct dnode_phys {
1002 uint8_t dn_type; /* dmu_object_type_t */
1003 uint8_t dn_indblkshift; /* ln2(indirect block size) */
1004 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
1005 uint8_t dn_nblkptr; /* length of dn_blkptr */
1006 uint8_t dn_bonustype; /* type of data in bonus buffer */
1007 uint8_t dn_checksum; /* ZIO_CHECKSUM type */
1008 uint8_t dn_compress; /* ZIO_COMPRESS type */
1009 uint8_t dn_flags; /* DNODE_FLAG_* */
1010 uint16_t dn_datablkszsec; /* data block size in 512b sectors */
1011 uint16_t dn_bonuslen; /* length of dn_bonus */
1012 uint8_t dn_extra_slots; /* # of subsequent slots consumed */
1015 /* accounting is protected by dn_dirty_mtx */
1016 uint64_t dn_maxblkid; /* largest allocated block ID */
1017 uint64_t dn_used; /* bytes (or sectors) of disk space */
1019 uint64_t dn_pad3[4];
1022 * The tail region is 448 bytes for a 512 byte dnode, and
1023 * correspondingly larger for larger dnode sizes. The spill
1024 * block pointer, when present, is always at the end of the tail
1025 * region. There are three ways this space may be used, using
1026 * a 512 byte dnode for this diagram:
1028 * 0 64 128 192 256 320 384 448 (offset)
1029 * +---------------+---------------+---------------+-------+
1030 * | dn_blkptr[0] | dn_blkptr[1] | dn_blkptr[2] | / |
1031 * +---------------+---------------+---------------+-------+
1032 * | dn_blkptr[0] | dn_bonus[0..319] |
1033 * +---------------+-----------------------+---------------+
1034 * | dn_blkptr[0] | dn_bonus[0..191] | dn_spill |
1035 * +---------------+-----------------------+---------------+
1038 blkptr_t dn_blkptr[1+DN_OLD_MAX_BONUSLEN/sizeof (blkptr_t)];
1040 blkptr_t __dn_ignore1;
1041 uint8_t dn_bonus[DN_OLD_MAX_BONUSLEN];
1044 blkptr_t __dn_ignore2;
1045 uint8_t __dn_ignore3[DN_OLD_MAX_BONUSLEN -
1052 #define DN_SPILL_BLKPTR(dnp) (blkptr_t *)((char *)(dnp) + \
1053 (((dnp)->dn_extra_slots + 1) << DNODE_SHIFT) - (1 << SPA_BLKPTRSHIFT))
1055 typedef enum dmu_object_byteswap {
1067 * Allocating a new byteswap type number makes the on-disk format
1068 * incompatible with any other format that uses the same number.
1070 * Data can usually be structured to work with one of the
1071 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types.
1074 } dmu_object_byteswap_t;
1076 #define DMU_OT_NEWTYPE 0x80
1077 #define DMU_OT_METADATA 0x40
1078 #define DMU_OT_BYTESWAP_MASK 0x3f
1081 * Defines a uint8_t object type. Object types specify if the data
1082 * in the object is metadata (boolean) and how to byteswap the data
1083 * (dmu_object_byteswap_t).
1085 #define DMU_OT(byteswap, metadata) \
1087 ((metadata) ? DMU_OT_METADATA : 0) | \
1088 ((byteswap) & DMU_OT_BYTESWAP_MASK))
1090 typedef enum dmu_object_type {
1093 DMU_OT_OBJECT_DIRECTORY, /* ZAP */
1094 DMU_OT_OBJECT_ARRAY, /* UINT64 */
1095 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */
1096 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */
1097 DMU_OT_BPLIST, /* UINT64 */
1098 DMU_OT_BPLIST_HDR, /* UINT64 */
1100 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */
1101 DMU_OT_SPACE_MAP, /* UINT64 */
1103 DMU_OT_INTENT_LOG, /* UINT64 */
1105 DMU_OT_DNODE, /* DNODE */
1106 DMU_OT_OBJSET, /* OBJSET */
1108 DMU_OT_DSL_DIR, /* UINT64 */
1109 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */
1110 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */
1111 DMU_OT_DSL_PROPS, /* ZAP */
1112 DMU_OT_DSL_DATASET, /* UINT64 */
1114 DMU_OT_ZNODE, /* ZNODE */
1115 DMU_OT_OLDACL, /* Old ACL */
1116 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */
1117 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */
1118 DMU_OT_MASTER_NODE, /* ZAP */
1119 DMU_OT_UNLINKED_SET, /* ZAP */
1121 DMU_OT_ZVOL, /* UINT8 */
1122 DMU_OT_ZVOL_PROP, /* ZAP */
1123 /* other; for testing only! */
1124 DMU_OT_PLAIN_OTHER, /* UINT8 */
1125 DMU_OT_UINT64_OTHER, /* UINT64 */
1126 DMU_OT_ZAP_OTHER, /* ZAP */
1127 /* new object types: */
1128 DMU_OT_ERROR_LOG, /* ZAP */
1129 DMU_OT_SPA_HISTORY, /* UINT8 */
1130 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */
1131 DMU_OT_POOL_PROPS, /* ZAP */
1132 DMU_OT_DSL_PERMS, /* ZAP */
1133 DMU_OT_ACL, /* ACL */
1134 DMU_OT_SYSACL, /* SYSACL */
1135 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */
1136 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */
1137 DMU_OT_NEXT_CLONES, /* ZAP */
1138 DMU_OT_SCAN_QUEUE, /* ZAP */
1139 DMU_OT_USERGROUP_USED, /* ZAP */
1140 DMU_OT_USERGROUP_QUOTA, /* ZAP */
1141 DMU_OT_USERREFS, /* ZAP */
1142 DMU_OT_DDT_ZAP, /* ZAP */
1143 DMU_OT_DDT_STATS, /* ZAP */
1144 DMU_OT_SA, /* System attr */
1145 DMU_OT_SA_MASTER_NODE, /* ZAP */
1146 DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */
1147 DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */
1148 DMU_OT_SCAN_XLATE, /* ZAP */
1149 DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */
1153 * Names for valid types declared with DMU_OT().
1155 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE),
1156 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE),
1157 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE),
1158 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE),
1159 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE),
1160 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE),
1161 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE),
1162 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE),
1163 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE),
1164 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE)
1165 } dmu_object_type_t;
1167 typedef enum dmu_objset_type {
1172 DMU_OST_OTHER, /* For testing only! */
1173 DMU_OST_ANY, /* Be careful! */
1175 } dmu_objset_type_t;
1177 #define ZAP_MAXVALUELEN (1024 * 8)
1180 * header for all bonus and spill buffers.
1181 * The header has a fixed portion with a variable number
1182 * of "lengths" depending on the number of variable sized
1183 * attribues which are determined by the "layout number"
1186 #define SA_MAGIC 0x2F505A /* ZFS SA */
1187 typedef struct sa_hdr_phys {
1189 uint16_t sa_layout_info; /* Encoded with hdrsize and layout number */
1190 uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */
1191 /* ... Data follows the lengths. */
1195 * sa_hdr_phys -> sa_layout_info
1198 * +--------+-------+
1200 * +--------+-------+
1202 * Bits 0-10 are the layout number
1203 * Bits 11-16 are the size of the header.
1204 * The hdrsize is the number * 8
1207 * hdrsz of 1 ==> 8 byte header
1208 * 2 ==> 16 byte header
1212 #define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
1213 #define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 16, 3, 0)
1214 #define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
1216 BF32_SET_SB(x, 10, 6, 3, 0, size); \
1217 BF32_SET(x, 0, 10, num); \
1220 #define SA_MODE_OFFSET 0
1221 #define SA_SIZE_OFFSET 8
1222 #define SA_GEN_OFFSET 16
1223 #define SA_UID_OFFSET 24
1224 #define SA_GID_OFFSET 32
1225 #define SA_PARENT_OFFSET 40
1226 #define SA_SYMLINK_OFFSET 160
1228 #define ZIO_OBJSET_MAC_LEN 32
1231 * Intent log header - this on disk structure holds fields to manage
1232 * the log. All fields are 64 bit to easily handle cross architectures.
1234 typedef struct zil_header {
1235 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */
1236 uint64_t zh_replay_seq; /* highest replayed sequence number */
1237 blkptr_t zh_log; /* log chain */
1238 uint64_t zh_claim_seq; /* highest claimed sequence number */
1242 #define OBJSET_PHYS_SIZE_V2 2048
1243 #define OBJSET_PHYS_SIZE_V3 4096
1245 typedef struct objset_phys {
1246 dnode_phys_t os_meta_dnode;
1247 zil_header_t os_zil_header;
1250 uint8_t os_portable_mac[ZIO_OBJSET_MAC_LEN];
1251 uint8_t os_local_mac[ZIO_OBJSET_MAC_LEN];
1252 char os_pad0[OBJSET_PHYS_SIZE_V2 - sizeof (dnode_phys_t)*3 -
1253 sizeof (zil_header_t) - sizeof (uint64_t)*2 -
1254 2*ZIO_OBJSET_MAC_LEN];
1255 dnode_phys_t os_userused_dnode;
1256 dnode_phys_t os_groupused_dnode;
1257 dnode_phys_t os_projectused_dnode;
1258 char os_pad1[OBJSET_PHYS_SIZE_V3 - OBJSET_PHYS_SIZE_V2 -
1259 sizeof (dnode_phys_t)];
1262 typedef struct dsl_dir_phys {
1263 uint64_t dd_creation_time; /* not actually used */
1264 uint64_t dd_head_dataset_obj;
1265 uint64_t dd_parent_obj;
1266 uint64_t dd_clone_parent_obj;
1267 uint64_t dd_child_dir_zapobj;
1269 * how much space our children are accounting for; for leaf
1270 * datasets, == physical space used by fs + snaps
1272 uint64_t dd_used_bytes;
1273 uint64_t dd_compressed_bytes;
1274 uint64_t dd_uncompressed_bytes;
1275 /* Administrative quota setting */
1277 /* Administrative reservation setting */
1278 uint64_t dd_reserved;
1279 uint64_t dd_props_zapobj;
1280 uint64_t dd_pad[21]; /* pad out to 256 bytes for good measure */
1283 typedef struct dsl_dataset_phys {
1284 uint64_t ds_dir_obj;
1285 uint64_t ds_prev_snap_obj;
1286 uint64_t ds_prev_snap_txg;
1287 uint64_t ds_next_snap_obj;
1288 uint64_t ds_snapnames_zapobj; /* zap obj of snaps; ==0 for snaps */
1289 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
1290 uint64_t ds_creation_time; /* seconds since 1970 */
1291 uint64_t ds_creation_txg;
1292 uint64_t ds_deadlist_obj;
1293 uint64_t ds_used_bytes;
1294 uint64_t ds_compressed_bytes;
1295 uint64_t ds_uncompressed_bytes;
1296 uint64_t ds_unique_bytes; /* only relevant to snapshots */
1298 * The ds_fsid_guid is a 56-bit ID that can change to avoid
1299 * collisions. The ds_guid is a 64-bit ID that will never
1300 * change, so there is a small probability that it will collide.
1302 uint64_t ds_fsid_guid;
1306 uint64_t ds_pad[8]; /* pad out to 320 bytes for good measure */
1307 } dsl_dataset_phys_t;
1310 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
1312 #define DMU_POOL_DIRECTORY_OBJECT 1
1313 #define DMU_POOL_CONFIG "config"
1314 #define DMU_POOL_FEATURES_FOR_READ "features_for_read"
1315 #define DMU_POOL_ROOT_DATASET "root_dataset"
1316 #define DMU_POOL_SYNC_BPLIST "sync_bplist"
1317 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
1318 #define DMU_POOL_ERRLOG_LAST "errlog_last"
1319 #define DMU_POOL_SPARES "spares"
1320 #define DMU_POOL_DEFLATE "deflate"
1321 #define DMU_POOL_HISTORY "history"
1322 #define DMU_POOL_PROPS "pool_props"
1323 #define DMU_POOL_CHECKSUM_SALT "org.illumos:checksum_salt"
1324 #define DMU_POOL_REMOVING "com.delphix:removing"
1325 #define DMU_POOL_OBSOLETE_BPOBJ "com.delphix:obsolete_bpobj"
1326 #define DMU_POOL_CONDENSING_INDIRECT "com.delphix:condensing_indirect"
1328 #define ZAP_MAGIC 0x2F52AB2ABULL
1330 #define FZAP_BLOCK_SHIFT(zap) ((zap)->zap_block_shift)
1332 #define ZAP_MAXCD (uint32_t)(-1)
1333 #define ZAP_HASHBITS 28
1334 #define MZAP_ENT_LEN 64
1335 #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2)
1336 #define MZAP_MAX_BLKSZ SPA_OLD_MAXBLOCKSIZE
1338 typedef struct mzap_ent_phys {
1341 uint16_t mze_pad; /* in case we want to chain them someday */
1342 char mze_name[MZAP_NAME_LEN];
1345 typedef struct mzap_phys {
1346 uint64_t mz_block_type; /* ZBT_MICRO */
1348 uint64_t mz_normflags;
1350 mzap_ent_phys_t mz_chunk[1];
1351 /* actually variable size depending on block size */
1355 * The (fat) zap is stored in one object. It is an array of
1356 * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
1358 * ptrtbl fits in first block:
1359 * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
1361 * ptrtbl too big for first block:
1362 * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
1366 #define ZBT_LEAF ((1ULL << 63) + 0)
1367 #define ZBT_HEADER ((1ULL << 63) + 1)
1368 #define ZBT_MICRO ((1ULL << 63) + 3)
1369 /* any other values are ptrtbl blocks */
1372 * the embedded pointer table takes up half a block:
1373 * block size / entry size (2^3) / 2
1375 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
1378 * The embedded pointer table starts half-way through the block. Since
1379 * the pointer table itself is half the block, it starts at (64-bit)
1380 * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
1382 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
1383 ((uint64_t *)(zap)->zap_phys) \
1384 [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
1388 * If zap_phys_t is modified, zap_byteswap() must be modified.
1390 typedef struct zap_phys {
1391 uint64_t zap_block_type; /* ZBT_HEADER */
1392 uint64_t zap_magic; /* ZAP_MAGIC */
1394 struct zap_table_phys {
1395 uint64_t zt_blk; /* starting block number */
1396 uint64_t zt_numblks; /* number of blocks */
1397 uint64_t zt_shift; /* bits to index it */
1398 uint64_t zt_nextblk; /* next (larger) copy start block */
1399 uint64_t zt_blks_copied; /* number source blocks copied */
1402 uint64_t zap_freeblk; /* the next free block */
1403 uint64_t zap_num_leafs; /* number of leafs */
1404 uint64_t zap_num_entries; /* number of entries */
1405 uint64_t zap_salt; /* salt to stir into hash function */
1406 uint64_t zap_normflags; /* flags for u8_textprep_str() */
1407 uint64_t zap_flags; /* zap_flags_t */
1409 * This structure is followed by padding, and then the embedded
1410 * pointer table. The embedded pointer table takes up second
1411 * half of the block. It is accessed using the
1412 * ZAP_EMBEDDED_PTRTBL_ENT() macro.
1416 typedef struct zap_table_phys zap_table_phys_t;
1419 typedef struct fat_zap {
1420 int zap_block_shift; /* block size shift */
1421 zap_phys_t *zap_phys;
1422 const struct spa *zap_spa;
1423 const dnode_phys_t *zap_dnode;
1426 #define ZAP_LEAF_MAGIC 0x2AB1EAF
1428 /* chunk size = 24 bytes */
1429 #define ZAP_LEAF_CHUNKSIZE 24
1432 * The amount of space available for chunks is:
1433 * block size (1<<l->l_bs) - hash entry size (2) * number of hash
1434 * entries - header space (2*chunksize)
1436 #define ZAP_LEAF_NUMCHUNKS(l) \
1437 (((1<<(l)->l_bs) - 2*ZAP_LEAF_HASH_NUMENTRIES(l)) / \
1438 ZAP_LEAF_CHUNKSIZE - 2)
1441 * The amount of space within the chunk available for the array is:
1442 * chunk size - space for type (1) - space for next pointer (2)
1444 #define ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
1446 #define ZAP_LEAF_ARRAY_NCHUNKS(bytes) \
1447 (((bytes)+ZAP_LEAF_ARRAY_BYTES-1)/ZAP_LEAF_ARRAY_BYTES)
1450 * Low water mark: when there are only this many chunks free, start
1451 * growing the ptrtbl. Ideally, this should be larger than a
1452 * "reasonably-sized" entry. 20 chunks is more than enough for the
1453 * largest directory entry (MAXNAMELEN (256) byte name, 8-byte value),
1454 * while still being only around 3% for 16k blocks.
1456 #define ZAP_LEAF_LOW_WATER (20)
1459 * The leaf hash table has block size / 2^5 (32) number of entries,
1460 * which should be more than enough for the maximum number of entries,
1461 * which is less than block size / CHUNKSIZE (24) / minimum number of
1462 * chunks per entry (3).
1464 #define ZAP_LEAF_HASH_SHIFT(l) ((l)->l_bs - 5)
1465 #define ZAP_LEAF_HASH_NUMENTRIES(l) (1 << ZAP_LEAF_HASH_SHIFT(l))
1468 * The chunks start immediately after the hash table. The end of the
1469 * hash table is at l_hash + HASH_NUMENTRIES, which we simply cast to a
1472 #define ZAP_LEAF_CHUNK(l, idx) \
1473 ((zap_leaf_chunk_t *) \
1474 ((l)->l_phys->l_hash + ZAP_LEAF_HASH_NUMENTRIES(l)))[idx]
1475 #define ZAP_LEAF_ENTRY(l, idx) (&ZAP_LEAF_CHUNK(l, idx).l_entry)
1477 typedef enum zap_chunk_type {
1478 ZAP_CHUNK_FREE = 253,
1479 ZAP_CHUNK_ENTRY = 252,
1480 ZAP_CHUNK_ARRAY = 251,
1481 ZAP_CHUNK_TYPE_MAX = 250
1486 * If zap_leaf_phys_t is modified, zap_leaf_byteswap() must be modified.
1488 typedef struct zap_leaf_phys {
1489 struct zap_leaf_header {
1490 uint64_t lh_block_type; /* ZBT_LEAF */
1492 uint64_t lh_prefix; /* hash prefix of this leaf */
1493 uint32_t lh_magic; /* ZAP_LEAF_MAGIC */
1494 uint16_t lh_nfree; /* number free chunks */
1495 uint16_t lh_nentries; /* number of entries */
1496 uint16_t lh_prefix_len; /* num bits used to id this */
1498 /* above is accessable to zap, below is zap_leaf private */
1500 uint16_t lh_freelist; /* chunk head of free list */
1501 uint8_t lh_pad2[12];
1502 } l_hdr; /* 2 24-byte chunks */
1505 * The header is followed by a hash table with
1506 * ZAP_LEAF_HASH_NUMENTRIES(zap) entries. The hash table is
1507 * followed by an array of ZAP_LEAF_NUMCHUNKS(zap)
1508 * zap_leaf_chunk structures. These structures are accessed
1509 * with the ZAP_LEAF_CHUNK() macro.
1515 typedef union zap_leaf_chunk {
1516 struct zap_leaf_entry {
1517 uint8_t le_type; /* always ZAP_CHUNK_ENTRY */
1518 uint8_t le_value_intlen; /* size of ints */
1519 uint16_t le_next; /* next entry in hash chain */
1520 uint16_t le_name_chunk; /* first chunk of the name */
1521 uint16_t le_name_numints; /* bytes in name, incl null */
1522 uint16_t le_value_chunk; /* first chunk of the value */
1523 uint16_t le_value_numints; /* value length in ints */
1524 uint32_t le_cd; /* collision differentiator */
1525 uint64_t le_hash; /* hash value of the name */
1527 struct zap_leaf_array {
1528 uint8_t la_type; /* always ZAP_CHUNK_ARRAY */
1529 uint8_t la_array[ZAP_LEAF_ARRAY_BYTES];
1530 uint16_t la_next; /* next blk or CHAIN_END */
1532 struct zap_leaf_free {
1533 uint8_t lf_type; /* always ZAP_CHUNK_FREE */
1534 uint8_t lf_pad[ZAP_LEAF_ARRAY_BYTES];
1535 uint16_t lf_next; /* next in free list, or CHAIN_END */
1539 typedef struct zap_leaf {
1540 int l_bs; /* block size shift */
1541 zap_leaf_phys_t *l_phys;
1545 * Define special zfs pflags
1547 #define ZFS_XATTR 0x1 /* is an extended attribute */
1548 #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */
1549 #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */
1551 #define MASTER_NODE_OBJ 1
1554 * special attributes for master node.
1557 #define ZFS_FSID "FSID"
1558 #define ZFS_UNLINKED_SET "DELETE_QUEUE"
1559 #define ZFS_ROOT_OBJ "ROOT"
1560 #define ZPL_VERSION_OBJ "VERSION"
1561 #define ZFS_PROP_BLOCKPERPAGE "BLOCKPERPAGE"
1562 #define ZFS_PROP_NOGROWBLOCKS "NOGROWBLOCKS"
1564 #define ZFS_FLAG_BLOCKPERPAGE 0x1
1565 #define ZFS_FLAG_NOGROWBLOCKS 0x2
1568 * ZPL version - rev'd whenever an incompatible on-disk format change
1569 * occurs. Independent of SPA/DMU/ZAP versioning.
1572 #define ZPL_VERSION 1ULL
1575 * The directory entry has the type (currently unused on Solaris) in the
1576 * top 4 bits, and the object number in the low 48 bits. The "middle"
1577 * 12 bits are unused.
1579 #define ZFS_DIRENT_TYPE(de) BF64_GET(de, 60, 4)
1580 #define ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48)
1581 #define ZFS_DIRENT_MAKE(type, obj) (((uint64_t)type << 60) | obj)
1583 typedef struct ace {
1584 uid_t a_who; /* uid or gid */
1585 uint32_t a_access_mask; /* read,write,... */
1586 uint16_t a_flags; /* see below */
1587 uint16_t a_type; /* allow or deny */
1590 #define ACE_SLOT_CNT 6
1592 typedef struct zfs_znode_acl {
1593 uint64_t z_acl_extern_obj; /* ext acl pieces */
1594 uint32_t z_acl_count; /* Number of ACEs */
1595 uint16_t z_acl_version; /* acl version */
1596 uint16_t z_acl_pad; /* pad */
1597 ace_t z_ace_data[ACE_SLOT_CNT]; /* 6 standard ACEs */
1601 * This is the persistent portion of the znode. It is stored
1602 * in the "bonus buffer" of the file. Short symbolic links
1603 * are also stored in the bonus buffer.
1605 typedef struct znode_phys {
1606 uint64_t zp_atime[2]; /* 0 - last file access time */
1607 uint64_t zp_mtime[2]; /* 16 - last file modification time */
1608 uint64_t zp_ctime[2]; /* 32 - last file change time */
1609 uint64_t zp_crtime[2]; /* 48 - creation time */
1610 uint64_t zp_gen; /* 64 - generation (txg of creation) */
1611 uint64_t zp_mode; /* 72 - file mode bits */
1612 uint64_t zp_size; /* 80 - size of file */
1613 uint64_t zp_parent; /* 88 - directory parent (`..') */
1614 uint64_t zp_links; /* 96 - number of links to file */
1615 uint64_t zp_xattr; /* 104 - DMU object for xattrs */
1616 uint64_t zp_rdev; /* 112 - dev_t for VBLK & VCHR files */
1617 uint64_t zp_flags; /* 120 - persistent flags */
1618 uint64_t zp_uid; /* 128 - file owner */
1619 uint64_t zp_gid; /* 136 - owning group */
1620 uint64_t zp_pad[4]; /* 144 - future */
1621 zfs_znode_acl_t zp_acl; /* 176 - 263 ACL */
1623 * Data may pad out any remaining bytes in the znode buffer, eg:
1625 * |<---------------------- dnode_phys (512) ------------------------>|
1626 * |<-- dnode (192) --->|<----------- "bonus" buffer (320) ---------->|
1627 * |<---- znode (264) ---->|<---- data (56) ---->|
1629 * At present, we only use this space to store symbolic links.
1634 * In-core vdev representation.
1638 typedef int vdev_phys_read_t(struct vdev *vdev, void *priv,
1639 off_t offset, void *buf, size_t bytes);
1640 typedef int vdev_read_t(struct vdev *vdev, const blkptr_t *bp,
1641 void *buf, off_t offset, size_t bytes);
1643 typedef STAILQ_HEAD(vdev_list, vdev) vdev_list_t;
1645 typedef struct vdev_indirect_mapping_entry_phys {
1647 * Decode with DVA_MAPPING_* macros.
1649 * the source offset (low 63 bits)
1650 * the one-bit "mark", used for garbage collection (by zdb)
1655 * Note: the DVA's asize is 24 bits, and can thus store ranges
1659 } vdev_indirect_mapping_entry_phys_t;
1661 #define DVA_MAPPING_GET_SRC_OFFSET(vimep) \
1662 BF64_GET_SB((vimep)->vimep_src, 0, 63, SPA_MINBLOCKSHIFT, 0)
1663 #define DVA_MAPPING_SET_SRC_OFFSET(vimep, x) \
1664 BF64_SET_SB((vimep)->vimep_src, 0, 63, SPA_MINBLOCKSHIFT, 0, x)
1666 typedef struct vdev_indirect_mapping_entry {
1667 vdev_indirect_mapping_entry_phys_t vime_mapping;
1668 uint32_t vime_obsolete_count;
1669 list_node_t vime_node;
1670 } vdev_indirect_mapping_entry_t;
1673 * This is stored in the bonus buffer of the mapping object, see comment of
1674 * vdev_indirect_config for more details.
1676 typedef struct vdev_indirect_mapping_phys {
1677 uint64_t vimp_max_offset;
1678 uint64_t vimp_bytes_mapped;
1679 uint64_t vimp_num_entries; /* number of v_i_m_entry_phys_t's */
1682 * For each entry in the mapping object, this object contains an
1683 * entry representing the number of bytes of that mapping entry
1684 * that were no longer in use by the pool at the time this indirect
1685 * vdev was last condensed.
1687 uint64_t vimp_counts_object;
1688 } vdev_indirect_mapping_phys_t;
1690 #define VDEV_INDIRECT_MAPPING_SIZE_V0 (3 * sizeof (uint64_t))
1692 typedef struct vdev_indirect_mapping {
1693 uint64_t vim_object;
1694 boolean_t vim_havecounts;
1696 /* vim_entries segment offset currently in memory. */
1697 uint64_t vim_entry_offset;
1698 /* vim_entries segment size. */
1699 size_t vim_num_entries;
1701 /* Needed by dnode_read() */
1702 const void *vim_spa;
1703 dnode_phys_t *vim_dn;
1706 * An ordered array of mapping entries, sorted by source offset.
1707 * Note that vim_entries is needed during a removal (and contains
1708 * mappings that have been synced to disk so far) to handle frees
1709 * from the removing device.
1711 vdev_indirect_mapping_entry_phys_t *vim_entries;
1712 objset_phys_t *vim_objset;
1713 vdev_indirect_mapping_phys_t *vim_phys;
1714 } vdev_indirect_mapping_t;
1717 * On-disk indirect vdev state.
1719 * An indirect vdev is described exclusively in the MOS config of a pool.
1720 * The config for an indirect vdev includes several fields, which are
1721 * accessed in memory by a vdev_indirect_config_t.
1723 typedef struct vdev_indirect_config {
1725 * Object (in MOS) which contains the indirect mapping. This object
1726 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
1727 * vimep_src. The bonus buffer for this object is a
1728 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
1729 * removal is initiated.
1731 * Note that this object can be empty if none of the data on the vdev
1732 * has been copied yet.
1734 uint64_t vic_mapping_object;
1737 * Object (in MOS) which contains the birth times for the mapping
1738 * entries. This object contains an array of
1739 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
1740 * buffer for this object is a vdev_indirect_birth_phys_t. This object
1741 * is allocated when a vdev removal is initiated.
1743 * Note that this object can be empty if none of the vdev has yet been
1746 uint64_t vic_births_object;
1749 * This is the vdev ID which was removed previous to this vdev, or
1750 * UINT64_MAX if there are no previously removed vdevs.
1752 uint64_t vic_prev_indirect_vdev;
1753 } vdev_indirect_config_t;
1755 typedef struct vdev {
1756 STAILQ_ENTRY(vdev) v_childlink; /* link in parent's child list */
1757 STAILQ_ENTRY(vdev) v_alllink; /* link in global vdev list */
1758 vdev_list_t v_children; /* children of this vdev */
1759 const char *v_name; /* vdev name */
1760 uint64_t v_guid; /* vdev guid */
1761 uint64_t v_id; /* index in parent */
1762 uint64_t v_psize; /* physical device capacity */
1763 int v_ashift; /* offset to block shift */
1764 int v_nparity; /* # parity for raidz */
1765 struct vdev *v_top; /* parent vdev */
1766 size_t v_nchildren; /* # children */
1767 vdev_state_t v_state; /* current state */
1768 vdev_phys_read_t *v_phys_read; /* read from raw leaf vdev */
1769 vdev_read_t *v_read; /* read from vdev */
1770 void *v_read_priv; /* private data for read function */
1772 struct spa *v_spa; /* link to spa */
1774 * Values stored in the config for an indirect or removing vdev.
1776 vdev_indirect_config_t vdev_indirect_config;
1777 vdev_indirect_mapping_t *v_mapping;
1781 * In-core pool representation.
1783 typedef STAILQ_HEAD(spa_list, spa) spa_list_t;
1785 typedef struct spa {
1786 STAILQ_ENTRY(spa) spa_link; /* link in global pool list */
1787 char *spa_name; /* pool name */
1788 uint64_t spa_guid; /* pool guid */
1789 uint64_t spa_txg; /* most recent transaction */
1790 struct uberblock spa_uberblock; /* best uberblock so far */
1791 vdev_t *spa_root_vdev; /* toplevel vdev container */
1792 objset_phys_t spa_mos; /* MOS for this pool */
1793 zio_cksum_salt_t spa_cksum_salt; /* secret salt for cksum */
1794 void *spa_cksum_tmpls[ZIO_CHECKSUM_FUNCTIONS];
1795 boolean_t spa_with_log; /* this pool has log */
1798 /* IO related arguments. */
1799 typedef struct zio {
1806 /* Stuff for the vdev stack */
1813 static void decode_embedded_bp_compressed(const blkptr_t *, void *);