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📄 Makefile.in(4.57 KB)
📄 THIRDPARTYLICENSE.cityhash(1.03 KB)
📄 THIRDPARTYLICENSE.cityhash.descrip(39 B)
📄 abd.c(31.72 KB)
📄 aggsum.c(8.46 KB)
📄 arc.c(330.91 KB)
📄 blkptr.c(4.26 KB)
📄 bplist.c(2.38 KB)
📄 bpobj.c(27.82 KB)
📄 bptree.c(8.2 KB)
📄 bqueue.c(4.7 KB)
📄 btree.c(65.19 KB)
📄 dataset_kstats.c(6.32 KB)
📄 dbuf.c(141.84 KB)
📄 dbuf_stats.c(6.05 KB)
📄 ddt.c(28.01 KB)
📄 ddt_zap.c(4.38 KB)
📄 dmu.c(60.44 KB)
📄 dmu_diff.c(6.25 KB)
📄 dmu_object.c(14.73 KB)
📄 dmu_objset.c(79.38 KB)
📄 dmu_recv.c(98.69 KB)
📄 dmu_redact.c(37.09 KB)
📄 dmu_send.c(95.51 KB)
📄 dmu_traverse.c(21.98 KB)
📄 dmu_tx.c(40.13 KB)
📄 dmu_zfetch.c(13.56 KB)
📄 dnode.c(71.32 KB)
📄 dnode_sync.c(24.93 KB)
📄 dsl_bookmark.c(51.22 KB)
📄 dsl_crypt.c(78.06 KB)
📄 dsl_dataset.c(141.61 KB)
📄 dsl_deadlist.c(27.94 KB)
📄 dsl_deleg.c(19.92 KB)
📄 dsl_destroy.c(36.73 KB)
📄 dsl_dir.c(65.45 KB)
📄 dsl_pool.c(42.92 KB)
📄 dsl_prop.c(32.88 KB)
📄 dsl_scan.c(134.47 KB)
📄 dsl_synctask.c(7.94 KB)
📄 dsl_userhold.c(18.26 KB)
📄 edonr_zfs.c(3.21 KB)
📄 fm.c(39.75 KB)
📄 gzip.c(2.57 KB)
📄 hkdf.c(4.5 KB)
📄 lz4.c(26.46 KB)
📄 lzjb.c(3.85 KB)
📄 metaslab.c(190.62 KB)
📄 mmp.c(24.93 KB)
📄 multilist.c(12.21 KB)
📄 objlist.c(2.58 KB)
📄 pathname.c(2.52 KB)
📄 range_tree.c(24.9 KB)
📄 refcount.c(7.82 KB)
📄 rrwlock.c(10.82 KB)
📄 sa.c(59.23 KB)
📄 sha256.c(2.89 KB)
📄 skein_zfs.c(2.92 KB)
📄 spa.c(272.81 KB)
📄 spa_boot.c(1.28 KB)
📄 spa_checkpoint.c(21.54 KB)
📄 spa_config.c(16.97 KB)
📄 spa_errlog.c(11.35 KB)
📄 spa_history.c(17.75 KB)
📄 spa_log_spacemap.c(47.13 KB)
📄 spa_misc.c(75.4 KB)
📄 spa_stats.c(27.08 KB)
📄 space_map.c(31.45 KB)
📄 space_reftree.c(4.21 KB)
📄 txg.c(27.49 KB)
📄 uberblock.c(2.17 KB)
📄 unique.c(2.53 KB)
📄 vdev.c(143.91 KB)
📄 vdev_cache.c(11.71 KB)
📄 vdev_draid.c(96.86 KB)
📄 vdev_draid_rand.c(1.16 KB)
📄 vdev_indirect.c(60.83 KB)
📄 vdev_indirect_births.c(5.88 KB)
📄 vdev_indirect_mapping.c(18.06 KB)
📄 vdev_initialize.c(22.38 KB)
📄 vdev_label.c(57.52 KB)
📄 vdev_mirror.c(26.76 KB)
📄 vdev_missing.c(3.74 KB)
📄 vdev_queue.c(37.61 KB)
📄 vdev_raidz.c(76.09 KB)
📄 vdev_raidz_math.c(17.18 KB)
📄 vdev_raidz_math_aarch64_neon.c(112.13 KB)
📄 vdev_raidz_math_aarch64_neon_common.h(23.64 KB)
📄 vdev_raidz_math_aarch64_neonx2.c(5.39 KB)
📄 vdev_raidz_math_avx2.c(10.64 KB)
📄 vdev_raidz_math_avx512bw.c(10.93 KB)
📄 vdev_raidz_math_avx512f.c(17.9 KB)
📄 vdev_raidz_math_impl.h(34.78 KB)
📄 vdev_raidz_math_powerpc_altivec.c(213.46 KB)
📄 vdev_raidz_math_powerpc_altivec_common.h(22.62 KB)
📄 vdev_raidz_math_scalar.c(9.54 KB)
📄 vdev_raidz_math_sse2.c(25.84 KB)
📄 vdev_raidz_math_ssse3.c(118 KB)
📄 vdev_rebuild.c(34.65 KB)
📄 vdev_removal.c(72.08 KB)
📄 vdev_root.c(4.28 KB)
📄 vdev_trim.c(50.92 KB)
📄 zap.c(35.35 KB)
📄 zap_leaf.c(22.75 KB)
📄 zap_micro.c(42.18 KB)
📄 zcp.c(42.29 KB)
📄 zcp_get.c(21.01 KB)
📄 zcp_global.c(1.9 KB)
📄 zcp_iter.c(18.21 KB)
📄 zcp_set.c(2.37 KB)
📄 zcp_synctask.c(13.69 KB)
📄 zfeature.c(17.6 KB)
📄 zfs_byteswap.c(5.64 KB)
📄 zfs_fm.c(40.58 KB)
📄 zfs_fuid.c(19.69 KB)
📄 zfs_ioctl.c(195.48 KB)
📄 zfs_log.c(20.6 KB)
📄 zfs_onexit.c(5.09 KB)
📄 zfs_quota.c(12.93 KB)
📄 zfs_ratelimit.c(2.35 KB)
📄 zfs_replay.c(26.11 KB)
📄 zfs_rlock.c(20.38 KB)
📄 zfs_sa.c(13.09 KB)
📄 zfs_vnops.c(22 KB)
📄 zil.c(111.32 KB)
📄 zio.c(144.72 KB)
📄 zio_checksum.c(17.28 KB)
📄 zio_compress.c(5.92 KB)
📄 zio_inject.c(25.79 KB)
📄 zle.c(2.52 KB)
📄 zrlock.c(4.45 KB)
📄 zthr.c(16.41 KB)
📄 zvol.c(42.96 KB)

Editing: blkptr.c

/*
 * CDDL HEADER START
 *
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2013, 2016 by Delphix. All rights reserved.
 */

#include <sys/blkptr.h>
#include <sys/zfs_context.h>
#include <sys/zio.h>
#include <sys/zio_compress.h>

/*
 * Embedded-data Block Pointers
 *
 * Normally, block pointers point (via their DVAs) to a block which holds data.
 * If the data that we need to store is very small, this is an inefficient
 * use of space, because a block must be at minimum 1 sector (typically 512
 * bytes or 4KB).  Additionally, reading these small blocks tends to generate
 * more random reads.
 *
 * Embedded-data Block Pointers allow small pieces of data (the "payload",
 * up to 112 bytes) to be stored in the block pointer itself, instead of
 * being pointed to.  The "Pointer" part of this name is a bit of a
 * misnomer, as nothing is pointed to.
 *
 * BP_EMBEDDED_TYPE_DATA block pointers allow highly-compressible data to
 * be embedded in the block pointer.  The logic for this is handled in
 * the SPA, by the zio pipeline.  Therefore most code outside the zio
 * pipeline doesn't need special-cases to handle these block pointers.
 *
 * See spa.h for details on the exact layout of embedded block pointers.
 */

void
encode_embedded_bp_compressed(blkptr_t *bp, void *data,
    enum zio_compress comp, int uncompressed_size, int compressed_size)
{
	uint64_t *bp64 = (uint64_t *)bp;
	uint64_t w = 0;
	uint8_t *data8 = data;

ASSERT3U(compressed_size, <=, BPE_PAYLOAD_SIZE);
	ASSERT(uncompressed_size == compressed_size ||
	    comp != ZIO_COMPRESS_OFF);
	ASSERT3U(comp, >=, ZIO_COMPRESS_OFF);
	ASSERT3U(comp, <, ZIO_COMPRESS_FUNCTIONS);

bzero(bp, sizeof (*bp));
	BP_SET_EMBEDDED(bp, B_TRUE);
	BP_SET_COMPRESS(bp, comp);
	BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
	BPE_SET_LSIZE(bp, uncompressed_size);
	BPE_SET_PSIZE(bp, compressed_size);

/*
	 * Encode the byte array into the words of the block pointer.
	 * First byte goes into low bits of first word (little endian).
	 */
	for (int i = 0; i < compressed_size; i++) {
		BF64_SET(w, (i % sizeof (w)) * NBBY, NBBY, data8[i]);
		if (i % sizeof (w) == sizeof (w) - 1) {
			/* we've reached the end of a word */
			ASSERT3P(bp64, <, bp + 1);
			*bp64 = w;
			bp64++;
			if (!BPE_IS_PAYLOADWORD(bp, bp64))
				bp64++;
			w = 0;
		}
	}
	/* write last partial word */
	if (bp64 < (uint64_t *)(bp + 1))
		*bp64 = w;
}

/*
 * buf must be at least BPE_GET_PSIZE(bp) bytes long (which will never be
 * more than BPE_PAYLOAD_SIZE bytes).
 */
void
decode_embedded_bp_compressed(const blkptr_t *bp, void *buf)
{
	int psize;
	uint8_t *buf8 = buf;
	uint64_t w = 0;
	const uint64_t *bp64 = (const uint64_t *)bp;

ASSERT(BP_IS_EMBEDDED(bp));

psize = BPE_GET_PSIZE(bp);

/*
	 * Decode the words of the block pointer into the byte array.
	 * Low bits of first word are the first byte (little endian).
	 */
	for (int i = 0; i < psize; i++) {
		if (i % sizeof (w) == 0) {
			/* beginning of a word */
			ASSERT3P(bp64, <, bp + 1);
			w = *bp64;
			bp64++;
			if (!BPE_IS_PAYLOADWORD(bp, bp64))
				bp64++;
		}
		buf8[i] = BF64_GET(w, (i % sizeof (w)) * NBBY, NBBY);
	}
}

/*
 * Fill in the buffer with the (decompressed) payload of the embedded
 * blkptr_t.  Takes into account compression and byteorder (the payload is
 * treated as a stream of bytes).
 * Return 0 on success, or ENOSPC if it won't fit in the buffer.
 */
int
decode_embedded_bp(const blkptr_t *bp, void *buf, int buflen)
{
	int lsize, psize;

ASSERT(BP_IS_EMBEDDED(bp));

lsize = BPE_GET_LSIZE(bp);
	psize = BPE_GET_PSIZE(bp);

if (lsize > buflen)
		return (SET_ERROR(ENOSPC));
	ASSERT3U(lsize, ==, buflen);

if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) {
		uint8_t dstbuf[BPE_PAYLOAD_SIZE];
		decode_embedded_bp_compressed(bp, dstbuf);
		VERIFY0(zio_decompress_data_buf(BP_GET_COMPRESS(bp),
		    dstbuf, buf, psize, buflen, NULL));
	} else {
		ASSERT3U(lsize, ==, psize);
		decode_embedded_bp_compressed(bp, buf);
	}

return (0);
}

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Editing: blkptr.c

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