c9e319faae
The strcpy() and sprintf() functions are deprecated on some platforms. Care is needed to ensure correct size is used. If some platforms miss snprintf, we can add a #define to sprintf, likewise strlcpy(). The biggest change is adding a size parameter to zfs_id_to_fuidstr(). The various *_impl_get() functions are only used on linux and have not yet been updated. Reviewed by: Sean Eric Fagan <sef@ixsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Jorgen Lundman <lundman@lundman.net> Closes #10400
4964 lines
143 KiB
C
4964 lines
143 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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* Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2017, Intel Corporation.
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*/
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#include <sys/sysmacros.h>
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#include <sys/zfs_context.h>
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#include <sys/fm/fs/zfs.h>
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#include <sys/spa.h>
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#include <sys/txg.h>
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#include <sys/spa_impl.h>
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#include <sys/vdev_impl.h>
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#include <sys/vdev_trim.h>
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#include <sys/zio_impl.h>
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#include <sys/zio_compress.h>
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#include <sys/zio_checksum.h>
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#include <sys/dmu_objset.h>
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#include <sys/arc.h>
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#include <sys/ddt.h>
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#include <sys/blkptr.h>
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#include <sys/zfeature.h>
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#include <sys/dsl_scan.h>
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#include <sys/metaslab_impl.h>
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#include <sys/time.h>
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#include <sys/trace_zfs.h>
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#include <sys/abd.h>
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#include <sys/dsl_crypt.h>
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#include <cityhash.h>
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/*
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* ==========================================================================
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* I/O type descriptions
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* ==========================================================================
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*/
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const char *zio_type_name[ZIO_TYPES] = {
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/*
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* Note: Linux kernel thread name length is limited
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* so these names will differ from upstream open zfs.
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*/
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"z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl", "z_trim"
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};
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int zio_dva_throttle_enabled = B_TRUE;
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int zio_deadman_log_all = B_FALSE;
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/*
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* ==========================================================================
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* I/O kmem caches
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* ==========================================================================
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*/
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kmem_cache_t *zio_cache;
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kmem_cache_t *zio_link_cache;
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kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
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kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
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#if defined(ZFS_DEBUG) && !defined(_KERNEL)
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uint64_t zio_buf_cache_allocs[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
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uint64_t zio_buf_cache_frees[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
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#endif
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/* Mark IOs as "slow" if they take longer than 30 seconds */
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int zio_slow_io_ms = (30 * MILLISEC);
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#define BP_SPANB(indblkshift, level) \
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(((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT)))
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#define COMPARE_META_LEVEL 0x80000000ul
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/*
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* The following actions directly effect the spa's sync-to-convergence logic.
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* The values below define the sync pass when we start performing the action.
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* Care should be taken when changing these values as they directly impact
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* spa_sync() performance. Tuning these values may introduce subtle performance
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* pathologies and should only be done in the context of performance analysis.
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* These tunables will eventually be removed and replaced with #defines once
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* enough analysis has been done to determine optimal values.
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*
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* The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
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* regular blocks are not deferred.
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*
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* Starting in sync pass 8 (zfs_sync_pass_dont_compress), we disable
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* compression (including of metadata). In practice, we don't have this
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* many sync passes, so this has no effect.
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*
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* The original intent was that disabling compression would help the sync
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* passes to converge. However, in practice disabling compression increases
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* the average number of sync passes, because when we turn compression off, a
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* lot of block's size will change and thus we have to re-allocate (not
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* overwrite) them. It also increases the number of 128KB allocations (e.g.
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* for indirect blocks and spacemaps) because these will not be compressed.
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* The 128K allocations are especially detrimental to performance on highly
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* fragmented systems, which may have very few free segments of this size,
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* and may need to load new metaslabs to satisfy 128K allocations.
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*/
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int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */
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int zfs_sync_pass_dont_compress = 8; /* don't compress starting in this pass */
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int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */
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/*
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* An allocating zio is one that either currently has the DVA allocate
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* stage set or will have it later in its lifetime.
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*/
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#define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE)
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/*
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* Enable smaller cores by excluding metadata
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* allocations as well.
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*/
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int zio_exclude_metadata = 0;
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int zio_requeue_io_start_cut_in_line = 1;
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#ifdef ZFS_DEBUG
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int zio_buf_debug_limit = 16384;
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#else
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int zio_buf_debug_limit = 0;
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#endif
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static inline void __zio_execute(zio_t *zio);
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static void zio_taskq_dispatch(zio_t *, zio_taskq_type_t, boolean_t);
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void
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zio_init(void)
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{
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size_t c;
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vmem_t *data_alloc_arena = NULL;
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zio_cache = kmem_cache_create("zio_cache",
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sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
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zio_link_cache = kmem_cache_create("zio_link_cache",
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sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
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/*
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* For small buffers, we want a cache for each multiple of
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* SPA_MINBLOCKSIZE. For larger buffers, we want a cache
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* for each quarter-power of 2.
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*/
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for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
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size_t size = (c + 1) << SPA_MINBLOCKSHIFT;
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size_t p2 = size;
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size_t align = 0;
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size_t data_cflags, cflags;
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data_cflags = KMC_NODEBUG;
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cflags = (zio_exclude_metadata || size > zio_buf_debug_limit) ?
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KMC_NODEBUG : 0;
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#if defined(_ILP32) && defined(_KERNEL)
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/*
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* Cache size limited to 1M on 32-bit platforms until ARC
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* buffers no longer require virtual address space.
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*/
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if (size > zfs_max_recordsize)
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break;
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#endif
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while (!ISP2(p2))
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p2 &= p2 - 1;
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#ifndef _KERNEL
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/*
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* If we are using watchpoints, put each buffer on its own page,
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* to eliminate the performance overhead of trapping to the
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* kernel when modifying a non-watched buffer that shares the
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* page with a watched buffer.
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*/
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if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE))
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continue;
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/*
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* Here's the problem - on 4K native devices in userland on
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* Linux using O_DIRECT, buffers must be 4K aligned or I/O
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* will fail with EINVAL, causing zdb (and others) to coredump.
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* Since userland probably doesn't need optimized buffer caches,
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* we just force 4K alignment on everything.
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*/
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align = 8 * SPA_MINBLOCKSIZE;
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#else
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if (size < PAGESIZE) {
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align = SPA_MINBLOCKSIZE;
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} else if (IS_P2ALIGNED(size, p2 >> 2)) {
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align = PAGESIZE;
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}
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#endif
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if (align != 0) {
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char name[36];
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(void) snprintf(name, sizeof (name), "zio_buf_%lu",
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(ulong_t)size);
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zio_buf_cache[c] = kmem_cache_create(name, size,
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align, NULL, NULL, NULL, NULL, NULL, cflags);
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(void) snprintf(name, sizeof (name), "zio_data_buf_%lu",
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(ulong_t)size);
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zio_data_buf_cache[c] = kmem_cache_create(name, size,
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align, NULL, NULL, NULL, NULL,
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data_alloc_arena, data_cflags);
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}
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}
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while (--c != 0) {
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ASSERT(zio_buf_cache[c] != NULL);
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if (zio_buf_cache[c - 1] == NULL)
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zio_buf_cache[c - 1] = zio_buf_cache[c];
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ASSERT(zio_data_buf_cache[c] != NULL);
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if (zio_data_buf_cache[c - 1] == NULL)
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zio_data_buf_cache[c - 1] = zio_data_buf_cache[c];
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}
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zio_inject_init();
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lz4_init();
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}
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void
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zio_fini(void)
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{
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size_t c;
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kmem_cache_t *last_cache = NULL;
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kmem_cache_t *last_data_cache = NULL;
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for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
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#ifdef _ILP32
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/*
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* Cache size limited to 1M on 32-bit platforms until ARC
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* buffers no longer require virtual address space.
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*/
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if (((c + 1) << SPA_MINBLOCKSHIFT) > zfs_max_recordsize)
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break;
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#endif
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#if defined(ZFS_DEBUG) && !defined(_KERNEL)
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if (zio_buf_cache_allocs[c] != zio_buf_cache_frees[c])
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(void) printf("zio_fini: [%d] %llu != %llu\n",
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(int)((c + 1) << SPA_MINBLOCKSHIFT),
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(long long unsigned)zio_buf_cache_allocs[c],
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(long long unsigned)zio_buf_cache_frees[c]);
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#endif
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if (zio_buf_cache[c] != last_cache) {
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last_cache = zio_buf_cache[c];
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kmem_cache_destroy(zio_buf_cache[c]);
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}
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zio_buf_cache[c] = NULL;
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if (zio_data_buf_cache[c] != last_data_cache) {
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last_data_cache = zio_data_buf_cache[c];
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kmem_cache_destroy(zio_data_buf_cache[c]);
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}
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zio_data_buf_cache[c] = NULL;
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}
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kmem_cache_destroy(zio_link_cache);
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kmem_cache_destroy(zio_cache);
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|
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zio_inject_fini();
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|
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lz4_fini();
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}
|
|
|
|
/*
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* ==========================================================================
|
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* Allocate and free I/O buffers
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* ==========================================================================
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*/
|
|
|
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/*
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* Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
|
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* crashdump if the kernel panics, so use it judiciously. Obviously, it's
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* useful to inspect ZFS metadata, but if possible, we should avoid keeping
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* excess / transient data in-core during a crashdump.
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*/
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void *
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zio_buf_alloc(size_t size)
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{
|
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size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
|
|
|
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VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
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#if defined(ZFS_DEBUG) && !defined(_KERNEL)
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atomic_add_64(&zio_buf_cache_allocs[c], 1);
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#endif
|
|
|
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return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE));
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}
|
|
|
|
/*
|
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* Use zio_data_buf_alloc to allocate data. The data will not appear in a
|
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* crashdump if the kernel panics. This exists so that we will limit the amount
|
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* of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
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* of kernel heap dumped to disk when the kernel panics)
|
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*/
|
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void *
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zio_data_buf_alloc(size_t size)
|
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{
|
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size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
|
|
|
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VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
|
|
|
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return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE));
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}
|
|
|
|
void
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zio_buf_free(void *buf, size_t size)
|
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{
|
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size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
|
|
|
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VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
|
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#if defined(ZFS_DEBUG) && !defined(_KERNEL)
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atomic_add_64(&zio_buf_cache_frees[c], 1);
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#endif
|
|
|
|
kmem_cache_free(zio_buf_cache[c], buf);
|
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}
|
|
|
|
void
|
|
zio_data_buf_free(void *buf, size_t size)
|
|
{
|
|
size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;
|
|
|
|
VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
|
|
|
|
kmem_cache_free(zio_data_buf_cache[c], buf);
|
|
}
|
|
|
|
static void
|
|
zio_abd_free(void *abd, size_t size)
|
|
{
|
|
abd_free((abd_t *)abd);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Push and pop I/O transform buffers
|
|
* ==========================================================================
|
|
*/
|
|
void
|
|
zio_push_transform(zio_t *zio, abd_t *data, uint64_t size, uint64_t bufsize,
|
|
zio_transform_func_t *transform)
|
|
{
|
|
zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP);
|
|
|
|
zt->zt_orig_abd = zio->io_abd;
|
|
zt->zt_orig_size = zio->io_size;
|
|
zt->zt_bufsize = bufsize;
|
|
zt->zt_transform = transform;
|
|
|
|
zt->zt_next = zio->io_transform_stack;
|
|
zio->io_transform_stack = zt;
|
|
|
|
zio->io_abd = data;
|
|
zio->io_size = size;
|
|
}
|
|
|
|
void
|
|
zio_pop_transforms(zio_t *zio)
|
|
{
|
|
zio_transform_t *zt;
|
|
|
|
while ((zt = zio->io_transform_stack) != NULL) {
|
|
if (zt->zt_transform != NULL)
|
|
zt->zt_transform(zio,
|
|
zt->zt_orig_abd, zt->zt_orig_size);
|
|
|
|
if (zt->zt_bufsize != 0)
|
|
abd_free(zio->io_abd);
|
|
|
|
zio->io_abd = zt->zt_orig_abd;
|
|
zio->io_size = zt->zt_orig_size;
|
|
zio->io_transform_stack = zt->zt_next;
|
|
|
|
kmem_free(zt, sizeof (zio_transform_t));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* I/O transform callbacks for subblocks, decompression, and decryption
|
|
* ==========================================================================
|
|
*/
|
|
static void
|
|
zio_subblock(zio_t *zio, abd_t *data, uint64_t size)
|
|
{
|
|
ASSERT(zio->io_size > size);
|
|
|
|
if (zio->io_type == ZIO_TYPE_READ)
|
|
abd_copy(data, zio->io_abd, size);
|
|
}
|
|
|
|
static void
|
|
zio_decompress(zio_t *zio, abd_t *data, uint64_t size)
|
|
{
|
|
if (zio->io_error == 0) {
|
|
void *tmp = abd_borrow_buf(data, size);
|
|
int ret = zio_decompress_data(BP_GET_COMPRESS(zio->io_bp),
|
|
zio->io_abd, tmp, zio->io_size, size);
|
|
abd_return_buf_copy(data, tmp, size);
|
|
|
|
if (zio_injection_enabled && ret == 0)
|
|
ret = zio_handle_fault_injection(zio, EINVAL);
|
|
|
|
if (ret != 0)
|
|
zio->io_error = SET_ERROR(EIO);
|
|
}
|
|
}
|
|
|
|
static void
|
|
zio_decrypt(zio_t *zio, abd_t *data, uint64_t size)
|
|
{
|
|
int ret;
|
|
void *tmp;
|
|
blkptr_t *bp = zio->io_bp;
|
|
spa_t *spa = zio->io_spa;
|
|
uint64_t dsobj = zio->io_bookmark.zb_objset;
|
|
uint64_t lsize = BP_GET_LSIZE(bp);
|
|
dmu_object_type_t ot = BP_GET_TYPE(bp);
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t mac[ZIO_DATA_MAC_LEN];
|
|
boolean_t no_crypt = B_FALSE;
|
|
|
|
ASSERT(BP_USES_CRYPT(bp));
|
|
ASSERT3U(size, !=, 0);
|
|
|
|
if (zio->io_error != 0)
|
|
return;
|
|
|
|
/*
|
|
* Verify the cksum of MACs stored in an indirect bp. It will always
|
|
* be possible to verify this since it does not require an encryption
|
|
* key.
|
|
*/
|
|
if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) {
|
|
zio_crypt_decode_mac_bp(bp, mac);
|
|
|
|
if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) {
|
|
/*
|
|
* We haven't decompressed the data yet, but
|
|
* zio_crypt_do_indirect_mac_checksum() requires
|
|
* decompressed data to be able to parse out the MACs
|
|
* from the indirect block. We decompress it now and
|
|
* throw away the result after we are finished.
|
|
*/
|
|
tmp = zio_buf_alloc(lsize);
|
|
ret = zio_decompress_data(BP_GET_COMPRESS(bp),
|
|
zio->io_abd, tmp, zio->io_size, lsize);
|
|
if (ret != 0) {
|
|
ret = SET_ERROR(EIO);
|
|
goto error;
|
|
}
|
|
ret = zio_crypt_do_indirect_mac_checksum(B_FALSE,
|
|
tmp, lsize, BP_SHOULD_BYTESWAP(bp), mac);
|
|
zio_buf_free(tmp, lsize);
|
|
} else {
|
|
ret = zio_crypt_do_indirect_mac_checksum_abd(B_FALSE,
|
|
zio->io_abd, size, BP_SHOULD_BYTESWAP(bp), mac);
|
|
}
|
|
abd_copy(data, zio->io_abd, size);
|
|
|
|
if (zio_injection_enabled && ot != DMU_OT_DNODE && ret == 0) {
|
|
ret = zio_handle_decrypt_injection(spa,
|
|
&zio->io_bookmark, ot, ECKSUM);
|
|
}
|
|
if (ret != 0)
|
|
goto error;
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If this is an authenticated block, just check the MAC. It would be
|
|
* nice to separate this out into its own flag, but for the moment
|
|
* enum zio_flag is out of bits.
|
|
*/
|
|
if (BP_IS_AUTHENTICATED(bp)) {
|
|
if (ot == DMU_OT_OBJSET) {
|
|
ret = spa_do_crypt_objset_mac_abd(B_FALSE, spa,
|
|
dsobj, zio->io_abd, size, BP_SHOULD_BYTESWAP(bp));
|
|
} else {
|
|
zio_crypt_decode_mac_bp(bp, mac);
|
|
ret = spa_do_crypt_mac_abd(B_FALSE, spa, dsobj,
|
|
zio->io_abd, size, mac);
|
|
if (zio_injection_enabled && ret == 0) {
|
|
ret = zio_handle_decrypt_injection(spa,
|
|
&zio->io_bookmark, ot, ECKSUM);
|
|
}
|
|
}
|
|
abd_copy(data, zio->io_abd, size);
|
|
|
|
if (ret != 0)
|
|
goto error;
|
|
|
|
return;
|
|
}
|
|
|
|
zio_crypt_decode_params_bp(bp, salt, iv);
|
|
|
|
if (ot == DMU_OT_INTENT_LOG) {
|
|
tmp = abd_borrow_buf_copy(zio->io_abd, sizeof (zil_chain_t));
|
|
zio_crypt_decode_mac_zil(tmp, mac);
|
|
abd_return_buf(zio->io_abd, tmp, sizeof (zil_chain_t));
|
|
} else {
|
|
zio_crypt_decode_mac_bp(bp, mac);
|
|
}
|
|
|
|
ret = spa_do_crypt_abd(B_FALSE, spa, &zio->io_bookmark, BP_GET_TYPE(bp),
|
|
BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), salt, iv, mac, size, data,
|
|
zio->io_abd, &no_crypt);
|
|
if (no_crypt)
|
|
abd_copy(data, zio->io_abd, size);
|
|
|
|
if (ret != 0)
|
|
goto error;
|
|
|
|
return;
|
|
|
|
error:
|
|
/* assert that the key was found unless this was speculative */
|
|
ASSERT(ret != EACCES || (zio->io_flags & ZIO_FLAG_SPECULATIVE));
|
|
|
|
/*
|
|
* If there was a decryption / authentication error return EIO as
|
|
* the io_error. If this was not a speculative zio, create an ereport.
|
|
*/
|
|
if (ret == ECKSUM) {
|
|
zio->io_error = SET_ERROR(EIO);
|
|
if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) {
|
|
spa_log_error(spa, &zio->io_bookmark);
|
|
zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
|
|
spa, NULL, &zio->io_bookmark, zio, 0, 0);
|
|
}
|
|
} else {
|
|
zio->io_error = ret;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* I/O parent/child relationships and pipeline interlocks
|
|
* ==========================================================================
|
|
*/
|
|
zio_t *
|
|
zio_walk_parents(zio_t *cio, zio_link_t **zl)
|
|
{
|
|
list_t *pl = &cio->io_parent_list;
|
|
|
|
*zl = (*zl == NULL) ? list_head(pl) : list_next(pl, *zl);
|
|
if (*zl == NULL)
|
|
return (NULL);
|
|
|
|
ASSERT((*zl)->zl_child == cio);
|
|
return ((*zl)->zl_parent);
|
|
}
|
|
|
|
zio_t *
|
|
zio_walk_children(zio_t *pio, zio_link_t **zl)
|
|
{
|
|
list_t *cl = &pio->io_child_list;
|
|
|
|
ASSERT(MUTEX_HELD(&pio->io_lock));
|
|
|
|
*zl = (*zl == NULL) ? list_head(cl) : list_next(cl, *zl);
|
|
if (*zl == NULL)
|
|
return (NULL);
|
|
|
|
ASSERT((*zl)->zl_parent == pio);
|
|
return ((*zl)->zl_child);
|
|
}
|
|
|
|
zio_t *
|
|
zio_unique_parent(zio_t *cio)
|
|
{
|
|
zio_link_t *zl = NULL;
|
|
zio_t *pio = zio_walk_parents(cio, &zl);
|
|
|
|
VERIFY3P(zio_walk_parents(cio, &zl), ==, NULL);
|
|
return (pio);
|
|
}
|
|
|
|
void
|
|
zio_add_child(zio_t *pio, zio_t *cio)
|
|
{
|
|
zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP);
|
|
|
|
/*
|
|
* Logical I/Os can have logical, gang, or vdev children.
|
|
* Gang I/Os can have gang or vdev children.
|
|
* Vdev I/Os can only have vdev children.
|
|
* The following ASSERT captures all of these constraints.
|
|
*/
|
|
ASSERT3S(cio->io_child_type, <=, pio->io_child_type);
|
|
|
|
zl->zl_parent = pio;
|
|
zl->zl_child = cio;
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
mutex_enter(&cio->io_lock);
|
|
|
|
ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0);
|
|
|
|
for (int w = 0; w < ZIO_WAIT_TYPES; w++)
|
|
pio->io_children[cio->io_child_type][w] += !cio->io_state[w];
|
|
|
|
list_insert_head(&pio->io_child_list, zl);
|
|
list_insert_head(&cio->io_parent_list, zl);
|
|
|
|
pio->io_child_count++;
|
|
cio->io_parent_count++;
|
|
|
|
mutex_exit(&cio->io_lock);
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
|
|
static void
|
|
zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl)
|
|
{
|
|
ASSERT(zl->zl_parent == pio);
|
|
ASSERT(zl->zl_child == cio);
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
mutex_enter(&cio->io_lock);
|
|
|
|
list_remove(&pio->io_child_list, zl);
|
|
list_remove(&cio->io_parent_list, zl);
|
|
|
|
pio->io_child_count--;
|
|
cio->io_parent_count--;
|
|
|
|
mutex_exit(&cio->io_lock);
|
|
mutex_exit(&pio->io_lock);
|
|
kmem_cache_free(zio_link_cache, zl);
|
|
}
|
|
|
|
static boolean_t
|
|
zio_wait_for_children(zio_t *zio, uint8_t childbits, enum zio_wait_type wait)
|
|
{
|
|
boolean_t waiting = B_FALSE;
|
|
|
|
mutex_enter(&zio->io_lock);
|
|
ASSERT(zio->io_stall == NULL);
|
|
for (int c = 0; c < ZIO_CHILD_TYPES; c++) {
|
|
if (!(ZIO_CHILD_BIT_IS_SET(childbits, c)))
|
|
continue;
|
|
|
|
uint64_t *countp = &zio->io_children[c][wait];
|
|
if (*countp != 0) {
|
|
zio->io_stage >>= 1;
|
|
ASSERT3U(zio->io_stage, !=, ZIO_STAGE_OPEN);
|
|
zio->io_stall = countp;
|
|
waiting = B_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
mutex_exit(&zio->io_lock);
|
|
return (waiting);
|
|
}
|
|
|
|
__attribute__((always_inline))
|
|
static inline void
|
|
zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait,
|
|
zio_t **next_to_executep)
|
|
{
|
|
uint64_t *countp = &pio->io_children[zio->io_child_type][wait];
|
|
int *errorp = &pio->io_child_error[zio->io_child_type];
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
|
|
*errorp = zio_worst_error(*errorp, zio->io_error);
|
|
pio->io_reexecute |= zio->io_reexecute;
|
|
ASSERT3U(*countp, >, 0);
|
|
|
|
(*countp)--;
|
|
|
|
if (*countp == 0 && pio->io_stall == countp) {
|
|
zio_taskq_type_t type =
|
|
pio->io_stage < ZIO_STAGE_VDEV_IO_START ? ZIO_TASKQ_ISSUE :
|
|
ZIO_TASKQ_INTERRUPT;
|
|
pio->io_stall = NULL;
|
|
mutex_exit(&pio->io_lock);
|
|
|
|
/*
|
|
* If we can tell the caller to execute this parent next, do
|
|
* so. Otherwise dispatch the parent zio as its own task.
|
|
*
|
|
* Having the caller execute the parent when possible reduces
|
|
* locking on the zio taskq's, reduces context switch
|
|
* overhead, and has no recursion penalty. Note that one
|
|
* read from disk typically causes at least 3 zio's: a
|
|
* zio_null(), the logical zio_read(), and then a physical
|
|
* zio. When the physical ZIO completes, we are able to call
|
|
* zio_done() on all 3 of these zio's from one invocation of
|
|
* zio_execute() by returning the parent back to
|
|
* zio_execute(). Since the parent isn't executed until this
|
|
* thread returns back to zio_execute(), the caller should do
|
|
* so promptly.
|
|
*
|
|
* In other cases, dispatching the parent prevents
|
|
* overflowing the stack when we have deeply nested
|
|
* parent-child relationships, as we do with the "mega zio"
|
|
* of writes for spa_sync(), and the chain of ZIL blocks.
|
|
*/
|
|
if (next_to_executep != NULL && *next_to_executep == NULL) {
|
|
*next_to_executep = pio;
|
|
} else {
|
|
zio_taskq_dispatch(pio, type, B_FALSE);
|
|
}
|
|
} else {
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
}
|
|
|
|
static void
|
|
zio_inherit_child_errors(zio_t *zio, enum zio_child c)
|
|
{
|
|
if (zio->io_child_error[c] != 0 && zio->io_error == 0)
|
|
zio->io_error = zio->io_child_error[c];
|
|
}
|
|
|
|
int
|
|
zio_bookmark_compare(const void *x1, const void *x2)
|
|
{
|
|
const zio_t *z1 = x1;
|
|
const zio_t *z2 = x2;
|
|
|
|
if (z1->io_bookmark.zb_objset < z2->io_bookmark.zb_objset)
|
|
return (-1);
|
|
if (z1->io_bookmark.zb_objset > z2->io_bookmark.zb_objset)
|
|
return (1);
|
|
|
|
if (z1->io_bookmark.zb_object < z2->io_bookmark.zb_object)
|
|
return (-1);
|
|
if (z1->io_bookmark.zb_object > z2->io_bookmark.zb_object)
|
|
return (1);
|
|
|
|
if (z1->io_bookmark.zb_level < z2->io_bookmark.zb_level)
|
|
return (-1);
|
|
if (z1->io_bookmark.zb_level > z2->io_bookmark.zb_level)
|
|
return (1);
|
|
|
|
if (z1->io_bookmark.zb_blkid < z2->io_bookmark.zb_blkid)
|
|
return (-1);
|
|
if (z1->io_bookmark.zb_blkid > z2->io_bookmark.zb_blkid)
|
|
return (1);
|
|
|
|
if (z1 < z2)
|
|
return (-1);
|
|
if (z1 > z2)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Create the various types of I/O (read, write, free, etc)
|
|
* ==========================================================================
|
|
*/
|
|
static zio_t *
|
|
zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
|
|
abd_t *data, uint64_t lsize, uint64_t psize, zio_done_func_t *done,
|
|
void *private, zio_type_t type, zio_priority_t priority,
|
|
enum zio_flag flags, vdev_t *vd, uint64_t offset,
|
|
const zbookmark_phys_t *zb, enum zio_stage stage,
|
|
enum zio_stage pipeline)
|
|
{
|
|
zio_t *zio;
|
|
|
|
IMPLY(type != ZIO_TYPE_TRIM, psize <= SPA_MAXBLOCKSIZE);
|
|
ASSERT(P2PHASE(psize, SPA_MINBLOCKSIZE) == 0);
|
|
ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0);
|
|
|
|
ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER));
|
|
ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER));
|
|
ASSERT(vd || stage == ZIO_STAGE_OPEN);
|
|
|
|
IMPLY(lsize != psize, (flags & ZIO_FLAG_RAW_COMPRESS) != 0);
|
|
|
|
zio = kmem_cache_alloc(zio_cache, KM_SLEEP);
|
|
bzero(zio, sizeof (zio_t));
|
|
|
|
mutex_init(&zio->io_lock, NULL, MUTEX_NOLOCKDEP, NULL);
|
|
cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL);
|
|
|
|
list_create(&zio->io_parent_list, sizeof (zio_link_t),
|
|
offsetof(zio_link_t, zl_parent_node));
|
|
list_create(&zio->io_child_list, sizeof (zio_link_t),
|
|
offsetof(zio_link_t, zl_child_node));
|
|
metaslab_trace_init(&zio->io_alloc_list);
|
|
|
|
if (vd != NULL)
|
|
zio->io_child_type = ZIO_CHILD_VDEV;
|
|
else if (flags & ZIO_FLAG_GANG_CHILD)
|
|
zio->io_child_type = ZIO_CHILD_GANG;
|
|
else if (flags & ZIO_FLAG_DDT_CHILD)
|
|
zio->io_child_type = ZIO_CHILD_DDT;
|
|
else
|
|
zio->io_child_type = ZIO_CHILD_LOGICAL;
|
|
|
|
if (bp != NULL) {
|
|
zio->io_bp = (blkptr_t *)bp;
|
|
zio->io_bp_copy = *bp;
|
|
zio->io_bp_orig = *bp;
|
|
if (type != ZIO_TYPE_WRITE ||
|
|
zio->io_child_type == ZIO_CHILD_DDT)
|
|
zio->io_bp = &zio->io_bp_copy; /* so caller can free */
|
|
if (zio->io_child_type == ZIO_CHILD_LOGICAL)
|
|
zio->io_logical = zio;
|
|
if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp))
|
|
pipeline |= ZIO_GANG_STAGES;
|
|
}
|
|
|
|
zio->io_spa = spa;
|
|
zio->io_txg = txg;
|
|
zio->io_done = done;
|
|
zio->io_private = private;
|
|
zio->io_type = type;
|
|
zio->io_priority = priority;
|
|
zio->io_vd = vd;
|
|
zio->io_offset = offset;
|
|
zio->io_orig_abd = zio->io_abd = data;
|
|
zio->io_orig_size = zio->io_size = psize;
|
|
zio->io_lsize = lsize;
|
|
zio->io_orig_flags = zio->io_flags = flags;
|
|
zio->io_orig_stage = zio->io_stage = stage;
|
|
zio->io_orig_pipeline = zio->io_pipeline = pipeline;
|
|
zio->io_pipeline_trace = ZIO_STAGE_OPEN;
|
|
|
|
zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY);
|
|
zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE);
|
|
|
|
if (zb != NULL)
|
|
zio->io_bookmark = *zb;
|
|
|
|
if (pio != NULL) {
|
|
if (zio->io_metaslab_class == NULL)
|
|
zio->io_metaslab_class = pio->io_metaslab_class;
|
|
if (zio->io_logical == NULL)
|
|
zio->io_logical = pio->io_logical;
|
|
if (zio->io_child_type == ZIO_CHILD_GANG)
|
|
zio->io_gang_leader = pio->io_gang_leader;
|
|
zio_add_child(pio, zio);
|
|
}
|
|
|
|
taskq_init_ent(&zio->io_tqent);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static void
|
|
zio_destroy(zio_t *zio)
|
|
{
|
|
metaslab_trace_fini(&zio->io_alloc_list);
|
|
list_destroy(&zio->io_parent_list);
|
|
list_destroy(&zio->io_child_list);
|
|
mutex_destroy(&zio->io_lock);
|
|
cv_destroy(&zio->io_cv);
|
|
kmem_cache_free(zio_cache, zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done,
|
|
void *private, enum zio_flag flags)
|
|
{
|
|
zio_t *zio;
|
|
|
|
zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private,
|
|
ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL,
|
|
ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags)
|
|
{
|
|
return (zio_null(NULL, spa, NULL, done, private, flags));
|
|
}
|
|
|
|
static int
|
|
zfs_blkptr_verify_log(spa_t *spa, const blkptr_t *bp,
|
|
enum blk_verify_flag blk_verify, const char *fmt, ...)
|
|
{
|
|
va_list adx;
|
|
char buf[256];
|
|
|
|
va_start(adx, fmt);
|
|
(void) vsnprintf(buf, sizeof (buf), fmt, adx);
|
|
va_end(adx);
|
|
|
|
switch (blk_verify) {
|
|
case BLK_VERIFY_HALT:
|
|
dprintf_bp(bp, "blkptr at %p dprintf_bp():", bp);
|
|
zfs_panic_recover("%s: %s", spa_name(spa), buf);
|
|
break;
|
|
case BLK_VERIFY_LOG:
|
|
zfs_dbgmsg("%s: %s", spa_name(spa), buf);
|
|
break;
|
|
case BLK_VERIFY_ONLY:
|
|
break;
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Verify the block pointer fields contain reasonable values. This means
|
|
* it only contains known object types, checksum/compression identifiers,
|
|
* block sizes within the maximum allowed limits, valid DVAs, etc.
|
|
*
|
|
* If everything checks out B_TRUE is returned. The zfs_blkptr_verify
|
|
* argument controls the behavior when an invalid field is detected.
|
|
*
|
|
* Modes for zfs_blkptr_verify:
|
|
* 1) BLK_VERIFY_ONLY (evaluate the block)
|
|
* 2) BLK_VERIFY_LOG (evaluate the block and log problems)
|
|
* 3) BLK_VERIFY_HALT (call zfs_panic_recover on error)
|
|
*/
|
|
boolean_t
|
|
zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp, boolean_t config_held,
|
|
enum blk_verify_flag blk_verify)
|
|
{
|
|
int errors = 0;
|
|
|
|
if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid TYPE %llu",
|
|
bp, (longlong_t)BP_GET_TYPE(bp));
|
|
}
|
|
if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS ||
|
|
BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid CHECKSUM %llu",
|
|
bp, (longlong_t)BP_GET_CHECKSUM(bp));
|
|
}
|
|
if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS ||
|
|
BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid COMPRESS %llu",
|
|
bp, (longlong_t)BP_GET_COMPRESS(bp));
|
|
}
|
|
if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid LSIZE %llu",
|
|
bp, (longlong_t)BP_GET_LSIZE(bp));
|
|
}
|
|
if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid PSIZE %llu",
|
|
bp, (longlong_t)BP_GET_PSIZE(bp));
|
|
}
|
|
|
|
if (BP_IS_EMBEDDED(bp)) {
|
|
if (BPE_GET_ETYPE(bp) >= NUM_BP_EMBEDDED_TYPES) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p has invalid ETYPE %llu",
|
|
bp, (longlong_t)BPE_GET_ETYPE(bp));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do not verify individual DVAs if the config is not trusted. This
|
|
* will be done once the zio is executed in vdev_mirror_map_alloc.
|
|
*/
|
|
if (!spa->spa_trust_config)
|
|
return (B_TRUE);
|
|
|
|
if (!config_held)
|
|
spa_config_enter(spa, SCL_VDEV, bp, RW_READER);
|
|
else
|
|
ASSERT(spa_config_held(spa, SCL_VDEV, RW_WRITER));
|
|
/*
|
|
* Pool-specific checks.
|
|
*
|
|
* Note: it would be nice to verify that the blk_birth and
|
|
* BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze()
|
|
* allows the birth time of log blocks (and dmu_sync()-ed blocks
|
|
* that are in the log) to be arbitrarily large.
|
|
*/
|
|
for (int i = 0; i < BP_GET_NDVAS(bp); i++) {
|
|
uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]);
|
|
|
|
if (vdevid >= spa->spa_root_vdev->vdev_children) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p DVA %u has invalid VDEV %llu",
|
|
bp, i, (longlong_t)vdevid);
|
|
continue;
|
|
}
|
|
vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid];
|
|
if (vd == NULL) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p DVA %u has invalid VDEV %llu",
|
|
bp, i, (longlong_t)vdevid);
|
|
continue;
|
|
}
|
|
if (vd->vdev_ops == &vdev_hole_ops) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p DVA %u has hole VDEV %llu",
|
|
bp, i, (longlong_t)vdevid);
|
|
continue;
|
|
}
|
|
if (vd->vdev_ops == &vdev_missing_ops) {
|
|
/*
|
|
* "missing" vdevs are valid during import, but we
|
|
* don't have their detailed info (e.g. asize), so
|
|
* we can't perform any more checks on them.
|
|
*/
|
|
continue;
|
|
}
|
|
uint64_t offset = DVA_GET_OFFSET(&bp->blk_dva[i]);
|
|
uint64_t asize = DVA_GET_ASIZE(&bp->blk_dva[i]);
|
|
if (BP_IS_GANG(bp))
|
|
asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
|
|
if (offset + asize > vd->vdev_asize) {
|
|
errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
|
|
"blkptr at %p DVA %u has invalid OFFSET %llu",
|
|
bp, i, (longlong_t)offset);
|
|
}
|
|
}
|
|
if (errors > 0)
|
|
dprintf_bp(bp, "blkptr at %p dprintf_bp():", bp);
|
|
if (!config_held)
|
|
spa_config_exit(spa, SCL_VDEV, bp);
|
|
|
|
return (errors == 0);
|
|
}
|
|
|
|
boolean_t
|
|
zfs_dva_valid(spa_t *spa, const dva_t *dva, const blkptr_t *bp)
|
|
{
|
|
uint64_t vdevid = DVA_GET_VDEV(dva);
|
|
|
|
if (vdevid >= spa->spa_root_vdev->vdev_children)
|
|
return (B_FALSE);
|
|
|
|
vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid];
|
|
if (vd == NULL)
|
|
return (B_FALSE);
|
|
|
|
if (vd->vdev_ops == &vdev_hole_ops)
|
|
return (B_FALSE);
|
|
|
|
if (vd->vdev_ops == &vdev_missing_ops) {
|
|
return (B_FALSE);
|
|
}
|
|
|
|
uint64_t offset = DVA_GET_OFFSET(dva);
|
|
uint64_t asize = DVA_GET_ASIZE(dva);
|
|
|
|
if (BP_IS_GANG(bp))
|
|
asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
|
|
if (offset + asize > vd->vdev_asize)
|
|
return (B_FALSE);
|
|
|
|
return (B_TRUE);
|
|
}
|
|
|
|
zio_t *
|
|
zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
|
|
abd_t *data, uint64_t size, zio_done_func_t *done, void *private,
|
|
zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb)
|
|
{
|
|
zio_t *zio;
|
|
|
|
(void) zfs_blkptr_verify(spa, bp, flags & ZIO_FLAG_CONFIG_WRITER,
|
|
BLK_VERIFY_HALT);
|
|
|
|
zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp,
|
|
data, size, size, done, private,
|
|
ZIO_TYPE_READ, priority, flags, NULL, 0, zb,
|
|
ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ?
|
|
ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
|
|
abd_t *data, uint64_t lsize, uint64_t psize, const zio_prop_t *zp,
|
|
zio_done_func_t *ready, zio_done_func_t *children_ready,
|
|
zio_done_func_t *physdone, zio_done_func_t *done,
|
|
void *private, zio_priority_t priority, enum zio_flag flags,
|
|
const zbookmark_phys_t *zb)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF &&
|
|
zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS &&
|
|
zp->zp_compress >= ZIO_COMPRESS_OFF &&
|
|
zp->zp_compress < ZIO_COMPRESS_FUNCTIONS &&
|
|
DMU_OT_IS_VALID(zp->zp_type) &&
|
|
zp->zp_level < 32 &&
|
|
zp->zp_copies > 0 &&
|
|
zp->zp_copies <= spa_max_replication(spa));
|
|
|
|
zio = zio_create(pio, spa, txg, bp, data, lsize, psize, done, private,
|
|
ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb,
|
|
ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ?
|
|
ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE);
|
|
|
|
zio->io_ready = ready;
|
|
zio->io_children_ready = children_ready;
|
|
zio->io_physdone = physdone;
|
|
zio->io_prop = *zp;
|
|
|
|
/*
|
|
* Data can be NULL if we are going to call zio_write_override() to
|
|
* provide the already-allocated BP. But we may need the data to
|
|
* verify a dedup hit (if requested). In this case, don't try to
|
|
* dedup (just take the already-allocated BP verbatim). Encrypted
|
|
* dedup blocks need data as well so we also disable dedup in this
|
|
* case.
|
|
*/
|
|
if (data == NULL &&
|
|
(zio->io_prop.zp_dedup_verify || zio->io_prop.zp_encrypt)) {
|
|
zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE;
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, abd_t *data,
|
|
uint64_t size, zio_done_func_t *done, void *private,
|
|
zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb)
|
|
{
|
|
zio_t *zio;
|
|
|
|
zio = zio_create(pio, spa, txg, bp, data, size, size, done, private,
|
|
ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_IO_REWRITE, NULL, 0, zb,
|
|
ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
void
|
|
zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite)
|
|
{
|
|
ASSERT(zio->io_type == ZIO_TYPE_WRITE);
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(zio->io_stage == ZIO_STAGE_OPEN);
|
|
ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa));
|
|
|
|
/*
|
|
* We must reset the io_prop to match the values that existed
|
|
* when the bp was first written by dmu_sync() keeping in mind
|
|
* that nopwrite and dedup are mutually exclusive.
|
|
*/
|
|
zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup;
|
|
zio->io_prop.zp_nopwrite = nopwrite;
|
|
zio->io_prop.zp_copies = copies;
|
|
zio->io_bp_override = bp;
|
|
}
|
|
|
|
void
|
|
zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp)
|
|
{
|
|
|
|
(void) zfs_blkptr_verify(spa, bp, B_FALSE, BLK_VERIFY_HALT);
|
|
|
|
/*
|
|
* The check for EMBEDDED is a performance optimization. We
|
|
* process the free here (by ignoring it) rather than
|
|
* putting it on the list and then processing it in zio_free_sync().
|
|
*/
|
|
if (BP_IS_EMBEDDED(bp))
|
|
return;
|
|
metaslab_check_free(spa, bp);
|
|
|
|
/*
|
|
* Frees that are for the currently-syncing txg, are not going to be
|
|
* deferred, and which will not need to do a read (i.e. not GANG or
|
|
* DEDUP), can be processed immediately. Otherwise, put them on the
|
|
* in-memory list for later processing.
|
|
*
|
|
* Note that we only defer frees after zfs_sync_pass_deferred_free
|
|
* when the log space map feature is disabled. [see relevant comment
|
|
* in spa_sync_iterate_to_convergence()]
|
|
*/
|
|
if (BP_IS_GANG(bp) ||
|
|
BP_GET_DEDUP(bp) ||
|
|
txg != spa->spa_syncing_txg ||
|
|
(spa_sync_pass(spa) >= zfs_sync_pass_deferred_free &&
|
|
!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))) {
|
|
bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp);
|
|
} else {
|
|
VERIFY3P(zio_free_sync(NULL, spa, txg, bp, 0), ==, NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* To improve performance, this function may return NULL if we were able
|
|
* to do the free immediately. This avoids the cost of creating a zio
|
|
* (and linking it to the parent, etc).
|
|
*/
|
|
zio_t *
|
|
zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
|
|
enum zio_flag flags)
|
|
{
|
|
ASSERT(!BP_IS_HOLE(bp));
|
|
ASSERT(spa_syncing_txg(spa) == txg);
|
|
|
|
if (BP_IS_EMBEDDED(bp))
|
|
return (NULL);
|
|
|
|
metaslab_check_free(spa, bp);
|
|
arc_freed(spa, bp);
|
|
dsl_scan_freed(spa, bp);
|
|
|
|
if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) {
|
|
/*
|
|
* GANG and DEDUP blocks can induce a read (for the gang block
|
|
* header, or the DDT), so issue them asynchronously so that
|
|
* this thread is not tied up.
|
|
*/
|
|
enum zio_stage stage =
|
|
ZIO_FREE_PIPELINE | ZIO_STAGE_ISSUE_ASYNC;
|
|
|
|
return (zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp),
|
|
BP_GET_PSIZE(bp), NULL, NULL,
|
|
ZIO_TYPE_FREE, ZIO_PRIORITY_NOW,
|
|
flags, NULL, 0, NULL, ZIO_STAGE_OPEN, stage));
|
|
} else {
|
|
metaslab_free(spa, bp, txg, B_FALSE);
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
zio_t *
|
|
zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
|
|
zio_done_func_t *done, void *private, enum zio_flag flags)
|
|
{
|
|
zio_t *zio;
|
|
|
|
(void) zfs_blkptr_verify(spa, bp, flags & ZIO_FLAG_CONFIG_WRITER,
|
|
BLK_VERIFY_HALT);
|
|
|
|
if (BP_IS_EMBEDDED(bp))
|
|
return (zio_null(pio, spa, NULL, NULL, NULL, 0));
|
|
|
|
/*
|
|
* A claim is an allocation of a specific block. Claims are needed
|
|
* to support immediate writes in the intent log. The issue is that
|
|
* immediate writes contain committed data, but in a txg that was
|
|
* *not* committed. Upon opening the pool after an unclean shutdown,
|
|
* the intent log claims all blocks that contain immediate write data
|
|
* so that the SPA knows they're in use.
|
|
*
|
|
* All claims *must* be resolved in the first txg -- before the SPA
|
|
* starts allocating blocks -- so that nothing is allocated twice.
|
|
* If txg == 0 we just verify that the block is claimable.
|
|
*/
|
|
ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <,
|
|
spa_min_claim_txg(spa));
|
|
ASSERT(txg == spa_min_claim_txg(spa) || txg == 0);
|
|
ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */
|
|
|
|
zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp),
|
|
BP_GET_PSIZE(bp), done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW,
|
|
flags, NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE);
|
|
ASSERT0(zio->io_queued_timestamp);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
|
|
zio_done_func_t *done, void *private, enum zio_flag flags)
|
|
{
|
|
zio_t *zio;
|
|
int c;
|
|
|
|
if (vd->vdev_children == 0) {
|
|
zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private,
|
|
ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL,
|
|
ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE);
|
|
|
|
zio->io_cmd = cmd;
|
|
} else {
|
|
zio = zio_null(pio, spa, NULL, NULL, NULL, flags);
|
|
|
|
for (c = 0; c < vd->vdev_children; c++)
|
|
zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd,
|
|
done, private, flags));
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
|
|
zio_done_func_t *done, void *private, zio_priority_t priority,
|
|
enum zio_flag flags, enum trim_flag trim_flags)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT0(vd->vdev_children);
|
|
ASSERT0(P2PHASE(offset, 1ULL << vd->vdev_ashift));
|
|
ASSERT0(P2PHASE(size, 1ULL << vd->vdev_ashift));
|
|
ASSERT3U(size, !=, 0);
|
|
|
|
zio = zio_create(pio, vd->vdev_spa, 0, NULL, NULL, size, size, done,
|
|
private, ZIO_TYPE_TRIM, priority, flags | ZIO_FLAG_PHYSICAL,
|
|
vd, offset, NULL, ZIO_STAGE_OPEN, ZIO_TRIM_PIPELINE);
|
|
zio->io_trim_flags = trim_flags;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
|
|
abd_t *data, int checksum, zio_done_func_t *done, void *private,
|
|
zio_priority_t priority, enum zio_flag flags, boolean_t labels)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT(vd->vdev_children == 0);
|
|
ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE ||
|
|
offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE);
|
|
ASSERT3U(offset + size, <=, vd->vdev_psize);
|
|
|
|
zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done,
|
|
private, ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd,
|
|
offset, NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE);
|
|
|
|
zio->io_prop.zp_checksum = checksum;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
|
|
abd_t *data, int checksum, zio_done_func_t *done, void *private,
|
|
zio_priority_t priority, enum zio_flag flags, boolean_t labels)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT(vd->vdev_children == 0);
|
|
ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE ||
|
|
offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE);
|
|
ASSERT3U(offset + size, <=, vd->vdev_psize);
|
|
|
|
zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done,
|
|
private, ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd,
|
|
offset, NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE);
|
|
|
|
zio->io_prop.zp_checksum = checksum;
|
|
|
|
if (zio_checksum_table[checksum].ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
|
|
/*
|
|
* zec checksums are necessarily destructive -- they modify
|
|
* the end of the write buffer to hold the verifier/checksum.
|
|
* Therefore, we must make a local copy in case the data is
|
|
* being written to multiple places in parallel.
|
|
*/
|
|
abd_t *wbuf = abd_alloc_sametype(data, size);
|
|
abd_copy(wbuf, data, size);
|
|
|
|
zio_push_transform(zio, wbuf, size, size, NULL);
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Create a child I/O to do some work for us.
|
|
*/
|
|
zio_t *
|
|
zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset,
|
|
abd_t *data, uint64_t size, int type, zio_priority_t priority,
|
|
enum zio_flag flags, zio_done_func_t *done, void *private)
|
|
{
|
|
enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE;
|
|
zio_t *zio;
|
|
|
|
/*
|
|
* vdev child I/Os do not propagate their error to the parent.
|
|
* Therefore, for correct operation the caller *must* check for
|
|
* and handle the error in the child i/o's done callback.
|
|
* The only exceptions are i/os that we don't care about
|
|
* (OPTIONAL or REPAIR).
|
|
*/
|
|
ASSERT((flags & ZIO_FLAG_OPTIONAL) || (flags & ZIO_FLAG_IO_REPAIR) ||
|
|
done != NULL);
|
|
|
|
if (type == ZIO_TYPE_READ && bp != NULL) {
|
|
/*
|
|
* If we have the bp, then the child should perform the
|
|
* checksum and the parent need not. This pushes error
|
|
* detection as close to the leaves as possible and
|
|
* eliminates redundant checksums in the interior nodes.
|
|
*/
|
|
pipeline |= ZIO_STAGE_CHECKSUM_VERIFY;
|
|
pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY;
|
|
}
|
|
|
|
if (vd->vdev_ops->vdev_op_leaf) {
|
|
ASSERT0(vd->vdev_children);
|
|
offset += VDEV_LABEL_START_SIZE;
|
|
}
|
|
|
|
flags |= ZIO_VDEV_CHILD_FLAGS(pio);
|
|
|
|
/*
|
|
* If we've decided to do a repair, the write is not speculative --
|
|
* even if the original read was.
|
|
*/
|
|
if (flags & ZIO_FLAG_IO_REPAIR)
|
|
flags &= ~ZIO_FLAG_SPECULATIVE;
|
|
|
|
/*
|
|
* If we're creating a child I/O that is not associated with a
|
|
* top-level vdev, then the child zio is not an allocating I/O.
|
|
* If this is a retried I/O then we ignore it since we will
|
|
* have already processed the original allocating I/O.
|
|
*/
|
|
if (flags & ZIO_FLAG_IO_ALLOCATING &&
|
|
(vd != vd->vdev_top || (flags & ZIO_FLAG_IO_RETRY))) {
|
|
ASSERT(pio->io_metaslab_class != NULL);
|
|
ASSERT(pio->io_metaslab_class->mc_alloc_throttle_enabled);
|
|
ASSERT(type == ZIO_TYPE_WRITE);
|
|
ASSERT(priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(!(flags & ZIO_FLAG_IO_REPAIR));
|
|
ASSERT(!(pio->io_flags & ZIO_FLAG_IO_REWRITE) ||
|
|
pio->io_child_type == ZIO_CHILD_GANG);
|
|
|
|
flags &= ~ZIO_FLAG_IO_ALLOCATING;
|
|
}
|
|
|
|
|
|
zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, size,
|
|
done, private, type, priority, flags, vd, offset, &pio->io_bookmark,
|
|
ZIO_STAGE_VDEV_IO_START >> 1, pipeline);
|
|
ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV);
|
|
|
|
zio->io_physdone = pio->io_physdone;
|
|
if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL)
|
|
zio->io_logical->io_phys_children++;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
zio_t *
|
|
zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, abd_t *data, uint64_t size,
|
|
zio_type_t type, zio_priority_t priority, enum zio_flag flags,
|
|
zio_done_func_t *done, void *private)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT(vd->vdev_ops->vdev_op_leaf);
|
|
|
|
zio = zio_create(NULL, vd->vdev_spa, 0, NULL,
|
|
data, size, size, done, private, type, priority,
|
|
flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED,
|
|
vd, offset, NULL,
|
|
ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
void
|
|
zio_flush(zio_t *zio, vdev_t *vd)
|
|
{
|
|
zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE,
|
|
NULL, NULL,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY));
|
|
}
|
|
|
|
void
|
|
zio_shrink(zio_t *zio, uint64_t size)
|
|
{
|
|
ASSERT3P(zio->io_executor, ==, NULL);
|
|
ASSERT3U(zio->io_orig_size, ==, zio->io_size);
|
|
ASSERT3U(size, <=, zio->io_size);
|
|
|
|
/*
|
|
* We don't shrink for raidz because of problems with the
|
|
* reconstruction when reading back less than the block size.
|
|
* Note, BP_IS_RAIDZ() assumes no compression.
|
|
*/
|
|
ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
|
|
if (!BP_IS_RAIDZ(zio->io_bp)) {
|
|
/* we are not doing a raw write */
|
|
ASSERT3U(zio->io_size, ==, zio->io_lsize);
|
|
zio->io_orig_size = zio->io_size = zio->io_lsize = size;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Prepare to read and write logical blocks
|
|
* ==========================================================================
|
|
*/
|
|
|
|
static zio_t *
|
|
zio_read_bp_init(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
uint64_t psize =
|
|
BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp);
|
|
|
|
ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);
|
|
|
|
if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF &&
|
|
zio->io_child_type == ZIO_CHILD_LOGICAL &&
|
|
!(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) {
|
|
zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize),
|
|
psize, psize, zio_decompress);
|
|
}
|
|
|
|
if (((BP_IS_PROTECTED(bp) && !(zio->io_flags & ZIO_FLAG_RAW_ENCRYPT)) ||
|
|
BP_HAS_INDIRECT_MAC_CKSUM(bp)) &&
|
|
zio->io_child_type == ZIO_CHILD_LOGICAL) {
|
|
zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize),
|
|
psize, psize, zio_decrypt);
|
|
}
|
|
|
|
if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) {
|
|
int psize = BPE_GET_PSIZE(bp);
|
|
void *data = abd_borrow_buf(zio->io_abd, psize);
|
|
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
decode_embedded_bp_compressed(bp, data);
|
|
abd_return_buf_copy(zio->io_abd, data, psize);
|
|
} else {
|
|
ASSERT(!BP_IS_EMBEDDED(bp));
|
|
ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);
|
|
}
|
|
|
|
if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0)
|
|
zio->io_flags |= ZIO_FLAG_DONT_CACHE;
|
|
|
|
if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP)
|
|
zio->io_flags |= ZIO_FLAG_DONT_CACHE;
|
|
|
|
if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL)
|
|
zio->io_pipeline = ZIO_DDT_READ_PIPELINE;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_write_bp_init(zio_t *zio)
|
|
{
|
|
if (!IO_IS_ALLOCATING(zio))
|
|
return (zio);
|
|
|
|
ASSERT(zio->io_child_type != ZIO_CHILD_DDT);
|
|
|
|
if (zio->io_bp_override) {
|
|
blkptr_t *bp = zio->io_bp;
|
|
zio_prop_t *zp = &zio->io_prop;
|
|
|
|
ASSERT(bp->blk_birth != zio->io_txg);
|
|
ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0);
|
|
|
|
*bp = *zio->io_bp_override;
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
|
|
if (BP_IS_EMBEDDED(bp))
|
|
return (zio);
|
|
|
|
/*
|
|
* If we've been overridden and nopwrite is set then
|
|
* set the flag accordingly to indicate that a nopwrite
|
|
* has already occurred.
|
|
*/
|
|
if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) {
|
|
ASSERT(!zp->zp_dedup);
|
|
ASSERT3U(BP_GET_CHECKSUM(bp), ==, zp->zp_checksum);
|
|
zio->io_flags |= ZIO_FLAG_NOPWRITE;
|
|
return (zio);
|
|
}
|
|
|
|
ASSERT(!zp->zp_nopwrite);
|
|
|
|
if (BP_IS_HOLE(bp) || !zp->zp_dedup)
|
|
return (zio);
|
|
|
|
ASSERT((zio_checksum_table[zp->zp_checksum].ci_flags &
|
|
ZCHECKSUM_FLAG_DEDUP) || zp->zp_dedup_verify);
|
|
|
|
if (BP_GET_CHECKSUM(bp) == zp->zp_checksum &&
|
|
!zp->zp_encrypt) {
|
|
BP_SET_DEDUP(bp, 1);
|
|
zio->io_pipeline |= ZIO_STAGE_DDT_WRITE;
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* We were unable to handle this as an override bp, treat
|
|
* it as a regular write I/O.
|
|
*/
|
|
zio->io_bp_override = NULL;
|
|
*bp = zio->io_bp_orig;
|
|
zio->io_pipeline = zio->io_orig_pipeline;
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_write_compress(zio_t *zio)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
zio_prop_t *zp = &zio->io_prop;
|
|
enum zio_compress compress = zp->zp_compress;
|
|
blkptr_t *bp = zio->io_bp;
|
|
uint64_t lsize = zio->io_lsize;
|
|
uint64_t psize = zio->io_size;
|
|
int pass = 1;
|
|
|
|
/*
|
|
* If our children haven't all reached the ready stage,
|
|
* wait for them and then repeat this pipeline stage.
|
|
*/
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_LOGICAL_BIT |
|
|
ZIO_CHILD_GANG_BIT, ZIO_WAIT_READY)) {
|
|
return (NULL);
|
|
}
|
|
|
|
if (!IO_IS_ALLOCATING(zio))
|
|
return (zio);
|
|
|
|
if (zio->io_children_ready != NULL) {
|
|
/*
|
|
* Now that all our children are ready, run the callback
|
|
* associated with this zio in case it wants to modify the
|
|
* data to be written.
|
|
*/
|
|
ASSERT3U(zp->zp_level, >, 0);
|
|
zio->io_children_ready(zio);
|
|
}
|
|
|
|
ASSERT(zio->io_child_type != ZIO_CHILD_DDT);
|
|
ASSERT(zio->io_bp_override == NULL);
|
|
|
|
if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) {
|
|
/*
|
|
* We're rewriting an existing block, which means we're
|
|
* working on behalf of spa_sync(). For spa_sync() to
|
|
* converge, it must eventually be the case that we don't
|
|
* have to allocate new blocks. But compression changes
|
|
* the blocksize, which forces a reallocate, and makes
|
|
* convergence take longer. Therefore, after the first
|
|
* few passes, stop compressing to ensure convergence.
|
|
*/
|
|
pass = spa_sync_pass(spa);
|
|
|
|
ASSERT(zio->io_txg == spa_syncing_txg(spa));
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(!BP_GET_DEDUP(bp));
|
|
|
|
if (pass >= zfs_sync_pass_dont_compress)
|
|
compress = ZIO_COMPRESS_OFF;
|
|
|
|
/* Make sure someone doesn't change their mind on overwrites */
|
|
ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp),
|
|
spa_max_replication(spa)) == BP_GET_NDVAS(bp));
|
|
}
|
|
|
|
/* If it's a compressed write that is not raw, compress the buffer. */
|
|
if (compress != ZIO_COMPRESS_OFF &&
|
|
!(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) {
|
|
void *cbuf = zio_buf_alloc(lsize);
|
|
psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize);
|
|
if (psize == 0 || psize == lsize) {
|
|
compress = ZIO_COMPRESS_OFF;
|
|
zio_buf_free(cbuf, lsize);
|
|
} else if (!zp->zp_dedup && !zp->zp_encrypt &&
|
|
psize <= BPE_PAYLOAD_SIZE &&
|
|
zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) &&
|
|
spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) {
|
|
encode_embedded_bp_compressed(bp,
|
|
cbuf, compress, lsize, psize);
|
|
BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA);
|
|
BP_SET_TYPE(bp, zio->io_prop.zp_type);
|
|
BP_SET_LEVEL(bp, zio->io_prop.zp_level);
|
|
zio_buf_free(cbuf, lsize);
|
|
bp->blk_birth = zio->io_txg;
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
ASSERT(spa_feature_is_active(spa,
|
|
SPA_FEATURE_EMBEDDED_DATA));
|
|
return (zio);
|
|
} else {
|
|
/*
|
|
* Round up compressed size up to the ashift
|
|
* of the smallest-ashift device, and zero the tail.
|
|
* This ensures that the compressed size of the BP
|
|
* (and thus compressratio property) are correct,
|
|
* in that we charge for the padding used to fill out
|
|
* the last sector.
|
|
*/
|
|
ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT);
|
|
size_t rounded = (size_t)P2ROUNDUP(psize,
|
|
1ULL << spa->spa_min_ashift);
|
|
if (rounded >= lsize) {
|
|
compress = ZIO_COMPRESS_OFF;
|
|
zio_buf_free(cbuf, lsize);
|
|
psize = lsize;
|
|
} else {
|
|
abd_t *cdata = abd_get_from_buf(cbuf, lsize);
|
|
abd_take_ownership_of_buf(cdata, B_TRUE);
|
|
abd_zero_off(cdata, psize, rounded - psize);
|
|
psize = rounded;
|
|
zio_push_transform(zio, cdata,
|
|
psize, lsize, NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We were unable to handle this as an override bp, treat
|
|
* it as a regular write I/O.
|
|
*/
|
|
zio->io_bp_override = NULL;
|
|
*bp = zio->io_bp_orig;
|
|
zio->io_pipeline = zio->io_orig_pipeline;
|
|
|
|
} else if ((zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) != 0 &&
|
|
zp->zp_type == DMU_OT_DNODE) {
|
|
/*
|
|
* The DMU actually relies on the zio layer's compression
|
|
* to free metadnode blocks that have had all contained
|
|
* dnodes freed. As a result, even when doing a raw
|
|
* receive, we must check whether the block can be compressed
|
|
* to a hole.
|
|
*/
|
|
psize = zio_compress_data(ZIO_COMPRESS_EMPTY,
|
|
zio->io_abd, NULL, lsize);
|
|
if (psize == 0)
|
|
compress = ZIO_COMPRESS_OFF;
|
|
} else {
|
|
ASSERT3U(psize, !=, 0);
|
|
}
|
|
|
|
/*
|
|
* The final pass of spa_sync() must be all rewrites, but the first
|
|
* few passes offer a trade-off: allocating blocks defers convergence,
|
|
* but newly allocated blocks are sequential, so they can be written
|
|
* to disk faster. Therefore, we allow the first few passes of
|
|
* spa_sync() to allocate new blocks, but force rewrites after that.
|
|
* There should only be a handful of blocks after pass 1 in any case.
|
|
*/
|
|
if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg &&
|
|
BP_GET_PSIZE(bp) == psize &&
|
|
pass >= zfs_sync_pass_rewrite) {
|
|
VERIFY3U(psize, !=, 0);
|
|
enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES;
|
|
|
|
zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages;
|
|
zio->io_flags |= ZIO_FLAG_IO_REWRITE;
|
|
} else {
|
|
BP_ZERO(bp);
|
|
zio->io_pipeline = ZIO_WRITE_PIPELINE;
|
|
}
|
|
|
|
if (psize == 0) {
|
|
if (zio->io_bp_orig.blk_birth != 0 &&
|
|
spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
|
|
BP_SET_LSIZE(bp, lsize);
|
|
BP_SET_TYPE(bp, zp->zp_type);
|
|
BP_SET_LEVEL(bp, zp->zp_level);
|
|
BP_SET_BIRTH(bp, zio->io_txg, 0);
|
|
}
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
} else {
|
|
ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER);
|
|
BP_SET_LSIZE(bp, lsize);
|
|
BP_SET_TYPE(bp, zp->zp_type);
|
|
BP_SET_LEVEL(bp, zp->zp_level);
|
|
BP_SET_PSIZE(bp, psize);
|
|
BP_SET_COMPRESS(bp, compress);
|
|
BP_SET_CHECKSUM(bp, zp->zp_checksum);
|
|
BP_SET_DEDUP(bp, zp->zp_dedup);
|
|
BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
|
|
if (zp->zp_dedup) {
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
|
|
ASSERT(!zp->zp_encrypt ||
|
|
DMU_OT_IS_ENCRYPTED(zp->zp_type));
|
|
zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE;
|
|
}
|
|
if (zp->zp_nopwrite) {
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
|
|
zio->io_pipeline |= ZIO_STAGE_NOP_WRITE;
|
|
}
|
|
}
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_free_bp_init(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
if (zio->io_child_type == ZIO_CHILD_LOGICAL) {
|
|
if (BP_GET_DEDUP(bp))
|
|
zio->io_pipeline = ZIO_DDT_FREE_PIPELINE;
|
|
}
|
|
|
|
ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Execute the I/O pipeline
|
|
* ==========================================================================
|
|
*/
|
|
|
|
static void
|
|
zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
zio_type_t t = zio->io_type;
|
|
int flags = (cutinline ? TQ_FRONT : 0);
|
|
|
|
/*
|
|
* If we're a config writer or a probe, the normal issue and
|
|
* interrupt threads may all be blocked waiting for the config lock.
|
|
* In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
|
|
*/
|
|
if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE))
|
|
t = ZIO_TYPE_NULL;
|
|
|
|
/*
|
|
* A similar issue exists for the L2ARC write thread until L2ARC 2.0.
|
|
*/
|
|
if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux)
|
|
t = ZIO_TYPE_NULL;
|
|
|
|
/*
|
|
* If this is a high priority I/O, then use the high priority taskq if
|
|
* available.
|
|
*/
|
|
if ((zio->io_priority == ZIO_PRIORITY_NOW ||
|
|
zio->io_priority == ZIO_PRIORITY_SYNC_WRITE) &&
|
|
spa->spa_zio_taskq[t][q + 1].stqs_count != 0)
|
|
q++;
|
|
|
|
ASSERT3U(q, <, ZIO_TASKQ_TYPES);
|
|
|
|
/*
|
|
* NB: We are assuming that the zio can only be dispatched
|
|
* to a single taskq at a time. It would be a grievous error
|
|
* to dispatch the zio to another taskq at the same time.
|
|
*/
|
|
ASSERT(taskq_empty_ent(&zio->io_tqent));
|
|
spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio,
|
|
flags, &zio->io_tqent);
|
|
}
|
|
|
|
static boolean_t
|
|
zio_taskq_member(zio_t *zio, zio_taskq_type_t q)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
|
|
taskq_t *tq = taskq_of_curthread();
|
|
|
|
for (zio_type_t t = 0; t < ZIO_TYPES; t++) {
|
|
spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
|
|
uint_t i;
|
|
for (i = 0; i < tqs->stqs_count; i++) {
|
|
if (tqs->stqs_taskq[i] == tq)
|
|
return (B_TRUE);
|
|
}
|
|
}
|
|
|
|
return (B_FALSE);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_issue_async(zio_t *zio)
|
|
{
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
zio_interrupt(zio_t *zio)
|
|
{
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE);
|
|
}
|
|
|
|
void
|
|
zio_delay_interrupt(zio_t *zio)
|
|
{
|
|
/*
|
|
* The timeout_generic() function isn't defined in userspace, so
|
|
* rather than trying to implement the function, the zio delay
|
|
* functionality has been disabled for userspace builds.
|
|
*/
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* If io_target_timestamp is zero, then no delay has been registered
|
|
* for this IO, thus jump to the end of this function and "skip" the
|
|
* delay; issuing it directly to the zio layer.
|
|
*/
|
|
if (zio->io_target_timestamp != 0) {
|
|
hrtime_t now = gethrtime();
|
|
|
|
if (now >= zio->io_target_timestamp) {
|
|
/*
|
|
* This IO has already taken longer than the target
|
|
* delay to complete, so we don't want to delay it
|
|
* any longer; we "miss" the delay and issue it
|
|
* directly to the zio layer. This is likely due to
|
|
* the target latency being set to a value less than
|
|
* the underlying hardware can satisfy (e.g. delay
|
|
* set to 1ms, but the disks take 10ms to complete an
|
|
* IO request).
|
|
*/
|
|
|
|
DTRACE_PROBE2(zio__delay__miss, zio_t *, zio,
|
|
hrtime_t, now);
|
|
|
|
zio_interrupt(zio);
|
|
} else {
|
|
taskqid_t tid;
|
|
hrtime_t diff = zio->io_target_timestamp - now;
|
|
clock_t expire_at_tick = ddi_get_lbolt() +
|
|
NSEC_TO_TICK(diff);
|
|
|
|
DTRACE_PROBE3(zio__delay__hit, zio_t *, zio,
|
|
hrtime_t, now, hrtime_t, diff);
|
|
|
|
if (NSEC_TO_TICK(diff) == 0) {
|
|
/* Our delay is less than a jiffy - just spin */
|
|
zfs_sleep_until(zio->io_target_timestamp);
|
|
zio_interrupt(zio);
|
|
} else {
|
|
/*
|
|
* Use taskq_dispatch_delay() in the place of
|
|
* OpenZFS's timeout_generic().
|
|
*/
|
|
tid = taskq_dispatch_delay(system_taskq,
|
|
(task_func_t *)zio_interrupt,
|
|
zio, TQ_NOSLEEP, expire_at_tick);
|
|
if (tid == TASKQID_INVALID) {
|
|
/*
|
|
* Couldn't allocate a task. Just
|
|
* finish the zio without a delay.
|
|
*/
|
|
zio_interrupt(zio);
|
|
}
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
#endif
|
|
DTRACE_PROBE1(zio__delay__skip, zio_t *, zio);
|
|
zio_interrupt(zio);
|
|
}
|
|
|
|
static void
|
|
zio_deadman_impl(zio_t *pio, int ziodepth)
|
|
{
|
|
zio_t *cio, *cio_next;
|
|
zio_link_t *zl = NULL;
|
|
vdev_t *vd = pio->io_vd;
|
|
|
|
if (zio_deadman_log_all || (vd != NULL && vd->vdev_ops->vdev_op_leaf)) {
|
|
vdev_queue_t *vq = vd ? &vd->vdev_queue : NULL;
|
|
zbookmark_phys_t *zb = &pio->io_bookmark;
|
|
uint64_t delta = gethrtime() - pio->io_timestamp;
|
|
uint64_t failmode = spa_get_deadman_failmode(pio->io_spa);
|
|
|
|
zfs_dbgmsg("slow zio[%d]: zio=%px timestamp=%llu "
|
|
"delta=%llu queued=%llu io=%llu "
|
|
"path=%s last=%llu "
|
|
"type=%d priority=%d flags=0x%x "
|
|
"stage=0x%x pipeline=0x%x pipeline-trace=0x%x "
|
|
"objset=%llu object=%llu level=%llu blkid=%llu "
|
|
"offset=%llu size=%llu error=%d",
|
|
ziodepth, pio, pio->io_timestamp,
|
|
delta, pio->io_delta, pio->io_delay,
|
|
vd ? vd->vdev_path : "NULL", vq ? vq->vq_io_complete_ts : 0,
|
|
pio->io_type, pio->io_priority, pio->io_flags,
|
|
pio->io_stage, pio->io_pipeline, pio->io_pipeline_trace,
|
|
zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
|
|
pio->io_offset, pio->io_size, pio->io_error);
|
|
zfs_ereport_post(FM_EREPORT_ZFS_DEADMAN,
|
|
pio->io_spa, vd, zb, pio, 0, 0);
|
|
|
|
if (failmode == ZIO_FAILURE_MODE_CONTINUE &&
|
|
taskq_empty_ent(&pio->io_tqent)) {
|
|
zio_interrupt(pio);
|
|
}
|
|
}
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
|
|
cio_next = zio_walk_children(pio, &zl);
|
|
zio_deadman_impl(cio, ziodepth + 1);
|
|
}
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
|
|
/*
|
|
* Log the critical information describing this zio and all of its children
|
|
* using the zfs_dbgmsg() interface then post deadman event for the ZED.
|
|
*/
|
|
void
|
|
zio_deadman(zio_t *pio, char *tag)
|
|
{
|
|
spa_t *spa = pio->io_spa;
|
|
char *name = spa_name(spa);
|
|
|
|
if (!zfs_deadman_enabled || spa_suspended(spa))
|
|
return;
|
|
|
|
zio_deadman_impl(pio, 0);
|
|
|
|
switch (spa_get_deadman_failmode(spa)) {
|
|
case ZIO_FAILURE_MODE_WAIT:
|
|
zfs_dbgmsg("%s waiting for hung I/O to pool '%s'", tag, name);
|
|
break;
|
|
|
|
case ZIO_FAILURE_MODE_CONTINUE:
|
|
zfs_dbgmsg("%s restarting hung I/O for pool '%s'", tag, name);
|
|
break;
|
|
|
|
case ZIO_FAILURE_MODE_PANIC:
|
|
fm_panic("%s determined I/O to pool '%s' is hung.", tag, name);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Execute the I/O pipeline until one of the following occurs:
|
|
* (1) the I/O completes; (2) the pipeline stalls waiting for
|
|
* dependent child I/Os; (3) the I/O issues, so we're waiting
|
|
* for an I/O completion interrupt; (4) the I/O is delegated by
|
|
* vdev-level caching or aggregation; (5) the I/O is deferred
|
|
* due to vdev-level queueing; (6) the I/O is handed off to
|
|
* another thread. In all cases, the pipeline stops whenever
|
|
* there's no CPU work; it never burns a thread in cv_wait_io().
|
|
*
|
|
* There's no locking on io_stage because there's no legitimate way
|
|
* for multiple threads to be attempting to process the same I/O.
|
|
*/
|
|
static zio_pipe_stage_t *zio_pipeline[];
|
|
|
|
/*
|
|
* zio_execute() is a wrapper around the static function
|
|
* __zio_execute() so that we can force __zio_execute() to be
|
|
* inlined. This reduces stack overhead which is important
|
|
* because __zio_execute() is called recursively in several zio
|
|
* code paths. zio_execute() itself cannot be inlined because
|
|
* it is externally visible.
|
|
*/
|
|
void
|
|
zio_execute(zio_t *zio)
|
|
{
|
|
fstrans_cookie_t cookie;
|
|
|
|
cookie = spl_fstrans_mark();
|
|
__zio_execute(zio);
|
|
spl_fstrans_unmark(cookie);
|
|
}
|
|
|
|
/*
|
|
* Used to determine if in the current context the stack is sized large
|
|
* enough to allow zio_execute() to be called recursively. A minimum
|
|
* stack size of 16K is required to avoid needing to re-dispatch the zio.
|
|
*/
|
|
boolean_t
|
|
zio_execute_stack_check(zio_t *zio)
|
|
{
|
|
#if !defined(HAVE_LARGE_STACKS)
|
|
dsl_pool_t *dp = spa_get_dsl(zio->io_spa);
|
|
|
|
/* Executing in txg_sync_thread() context. */
|
|
if (dp && curthread == dp->dp_tx.tx_sync_thread)
|
|
return (B_TRUE);
|
|
|
|
/* Pool initialization outside of zio_taskq context. */
|
|
if (dp && spa_is_initializing(dp->dp_spa) &&
|
|
!zio_taskq_member(zio, ZIO_TASKQ_ISSUE) &&
|
|
!zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))
|
|
return (B_TRUE);
|
|
#endif /* HAVE_LARGE_STACKS */
|
|
|
|
return (B_FALSE);
|
|
}
|
|
|
|
__attribute__((always_inline))
|
|
static inline void
|
|
__zio_execute(zio_t *zio)
|
|
{
|
|
ASSERT3U(zio->io_queued_timestamp, >, 0);
|
|
|
|
while (zio->io_stage < ZIO_STAGE_DONE) {
|
|
enum zio_stage pipeline = zio->io_pipeline;
|
|
enum zio_stage stage = zio->io_stage;
|
|
|
|
zio->io_executor = curthread;
|
|
|
|
ASSERT(!MUTEX_HELD(&zio->io_lock));
|
|
ASSERT(ISP2(stage));
|
|
ASSERT(zio->io_stall == NULL);
|
|
|
|
do {
|
|
stage <<= 1;
|
|
} while ((stage & pipeline) == 0);
|
|
|
|
ASSERT(stage <= ZIO_STAGE_DONE);
|
|
|
|
/*
|
|
* If we are in interrupt context and this pipeline stage
|
|
* will grab a config lock that is held across I/O,
|
|
* or may wait for an I/O that needs an interrupt thread
|
|
* to complete, issue async to avoid deadlock.
|
|
*
|
|
* For VDEV_IO_START, we cut in line so that the io will
|
|
* be sent to disk promptly.
|
|
*/
|
|
if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL &&
|
|
zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) {
|
|
boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
|
|
zio_requeue_io_start_cut_in_line : B_FALSE;
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the current context doesn't have large enough stacks
|
|
* the zio must be issued asynchronously to prevent overflow.
|
|
*/
|
|
if (zio_execute_stack_check(zio)) {
|
|
boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
|
|
zio_requeue_io_start_cut_in_line : B_FALSE;
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
|
|
return;
|
|
}
|
|
|
|
zio->io_stage = stage;
|
|
zio->io_pipeline_trace |= zio->io_stage;
|
|
|
|
/*
|
|
* The zio pipeline stage returns the next zio to execute
|
|
* (typically the same as this one), or NULL if we should
|
|
* stop.
|
|
*/
|
|
zio = zio_pipeline[highbit64(stage) - 1](zio);
|
|
|
|
if (zio == NULL)
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Initiate I/O, either sync or async
|
|
* ==========================================================================
|
|
*/
|
|
int
|
|
zio_wait(zio_t *zio)
|
|
{
|
|
/*
|
|
* Some routines, like zio_free_sync(), may return a NULL zio
|
|
* to avoid the performance overhead of creating and then destroying
|
|
* an unneeded zio. For the callers' simplicity, we accept a NULL
|
|
* zio and ignore it.
|
|
*/
|
|
if (zio == NULL)
|
|
return (0);
|
|
|
|
long timeout = MSEC_TO_TICK(zfs_deadman_ziotime_ms);
|
|
int error;
|
|
|
|
ASSERT3S(zio->io_stage, ==, ZIO_STAGE_OPEN);
|
|
ASSERT3P(zio->io_executor, ==, NULL);
|
|
|
|
zio->io_waiter = curthread;
|
|
ASSERT0(zio->io_queued_timestamp);
|
|
zio->io_queued_timestamp = gethrtime();
|
|
|
|
__zio_execute(zio);
|
|
|
|
mutex_enter(&zio->io_lock);
|
|
while (zio->io_executor != NULL) {
|
|
error = cv_timedwait_io(&zio->io_cv, &zio->io_lock,
|
|
ddi_get_lbolt() + timeout);
|
|
|
|
if (zfs_deadman_enabled && error == -1 &&
|
|
gethrtime() - zio->io_queued_timestamp >
|
|
spa_deadman_ziotime(zio->io_spa)) {
|
|
mutex_exit(&zio->io_lock);
|
|
timeout = MSEC_TO_TICK(zfs_deadman_checktime_ms);
|
|
zio_deadman(zio, FTAG);
|
|
mutex_enter(&zio->io_lock);
|
|
}
|
|
}
|
|
mutex_exit(&zio->io_lock);
|
|
|
|
error = zio->io_error;
|
|
zio_destroy(zio);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
zio_nowait(zio_t *zio)
|
|
{
|
|
/*
|
|
* See comment in zio_wait().
|
|
*/
|
|
if (zio == NULL)
|
|
return;
|
|
|
|
ASSERT3P(zio->io_executor, ==, NULL);
|
|
|
|
if (zio->io_child_type == ZIO_CHILD_LOGICAL &&
|
|
zio_unique_parent(zio) == NULL) {
|
|
zio_t *pio;
|
|
|
|
/*
|
|
* This is a logical async I/O with no parent to wait for it.
|
|
* We add it to the spa_async_root_zio "Godfather" I/O which
|
|
* will ensure they complete prior to unloading the pool.
|
|
*/
|
|
spa_t *spa = zio->io_spa;
|
|
kpreempt_disable();
|
|
pio = spa->spa_async_zio_root[CPU_SEQID];
|
|
kpreempt_enable();
|
|
|
|
zio_add_child(pio, zio);
|
|
}
|
|
|
|
ASSERT0(zio->io_queued_timestamp);
|
|
zio->io_queued_timestamp = gethrtime();
|
|
__zio_execute(zio);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Reexecute, cancel, or suspend/resume failed I/O
|
|
* ==========================================================================
|
|
*/
|
|
|
|
static void
|
|
zio_reexecute(zio_t *pio)
|
|
{
|
|
zio_t *cio, *cio_next;
|
|
|
|
ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN);
|
|
ASSERT(pio->io_gang_leader == NULL);
|
|
ASSERT(pio->io_gang_tree == NULL);
|
|
|
|
pio->io_flags = pio->io_orig_flags;
|
|
pio->io_stage = pio->io_orig_stage;
|
|
pio->io_pipeline = pio->io_orig_pipeline;
|
|
pio->io_reexecute = 0;
|
|
pio->io_flags |= ZIO_FLAG_REEXECUTED;
|
|
pio->io_pipeline_trace = 0;
|
|
pio->io_error = 0;
|
|
for (int w = 0; w < ZIO_WAIT_TYPES; w++)
|
|
pio->io_state[w] = 0;
|
|
for (int c = 0; c < ZIO_CHILD_TYPES; c++)
|
|
pio->io_child_error[c] = 0;
|
|
|
|
if (IO_IS_ALLOCATING(pio))
|
|
BP_ZERO(pio->io_bp);
|
|
|
|
/*
|
|
* As we reexecute pio's children, new children could be created.
|
|
* New children go to the head of pio's io_child_list, however,
|
|
* so we will (correctly) not reexecute them. The key is that
|
|
* the remainder of pio's io_child_list, from 'cio_next' onward,
|
|
* cannot be affected by any side effects of reexecuting 'cio'.
|
|
*/
|
|
zio_link_t *zl = NULL;
|
|
mutex_enter(&pio->io_lock);
|
|
for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
|
|
cio_next = zio_walk_children(pio, &zl);
|
|
for (int w = 0; w < ZIO_WAIT_TYPES; w++)
|
|
pio->io_children[cio->io_child_type][w]++;
|
|
mutex_exit(&pio->io_lock);
|
|
zio_reexecute(cio);
|
|
mutex_enter(&pio->io_lock);
|
|
}
|
|
mutex_exit(&pio->io_lock);
|
|
|
|
/*
|
|
* Now that all children have been reexecuted, execute the parent.
|
|
* We don't reexecute "The Godfather" I/O here as it's the
|
|
* responsibility of the caller to wait on it.
|
|
*/
|
|
if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) {
|
|
pio->io_queued_timestamp = gethrtime();
|
|
__zio_execute(pio);
|
|
}
|
|
}
|
|
|
|
void
|
|
zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t reason)
|
|
{
|
|
if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC)
|
|
fm_panic("Pool '%s' has encountered an uncorrectable I/O "
|
|
"failure and the failure mode property for this pool "
|
|
"is set to panic.", spa_name(spa));
|
|
|
|
cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O "
|
|
"failure and has been suspended.\n", spa_name(spa));
|
|
|
|
zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL,
|
|
NULL, NULL, 0, 0);
|
|
|
|
mutex_enter(&spa->spa_suspend_lock);
|
|
|
|
if (spa->spa_suspend_zio_root == NULL)
|
|
spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE |
|
|
ZIO_FLAG_GODFATHER);
|
|
|
|
spa->spa_suspended = reason;
|
|
|
|
if (zio != NULL) {
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER));
|
|
ASSERT(zio != spa->spa_suspend_zio_root);
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
ASSERT(zio_unique_parent(zio) == NULL);
|
|
ASSERT(zio->io_stage == ZIO_STAGE_DONE);
|
|
zio_add_child(spa->spa_suspend_zio_root, zio);
|
|
}
|
|
|
|
mutex_exit(&spa->spa_suspend_lock);
|
|
}
|
|
|
|
int
|
|
zio_resume(spa_t *spa)
|
|
{
|
|
zio_t *pio;
|
|
|
|
/*
|
|
* Reexecute all previously suspended i/o.
|
|
*/
|
|
mutex_enter(&spa->spa_suspend_lock);
|
|
spa->spa_suspended = ZIO_SUSPEND_NONE;
|
|
cv_broadcast(&spa->spa_suspend_cv);
|
|
pio = spa->spa_suspend_zio_root;
|
|
spa->spa_suspend_zio_root = NULL;
|
|
mutex_exit(&spa->spa_suspend_lock);
|
|
|
|
if (pio == NULL)
|
|
return (0);
|
|
|
|
zio_reexecute(pio);
|
|
return (zio_wait(pio));
|
|
}
|
|
|
|
void
|
|
zio_resume_wait(spa_t *spa)
|
|
{
|
|
mutex_enter(&spa->spa_suspend_lock);
|
|
while (spa_suspended(spa))
|
|
cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock);
|
|
mutex_exit(&spa->spa_suspend_lock);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Gang blocks.
|
|
*
|
|
* A gang block is a collection of small blocks that looks to the DMU
|
|
* like one large block. When zio_dva_allocate() cannot find a block
|
|
* of the requested size, due to either severe fragmentation or the pool
|
|
* being nearly full, it calls zio_write_gang_block() to construct the
|
|
* block from smaller fragments.
|
|
*
|
|
* A gang block consists of a gang header (zio_gbh_phys_t) and up to
|
|
* three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
|
|
* an indirect block: it's an array of block pointers. It consumes
|
|
* only one sector and hence is allocatable regardless of fragmentation.
|
|
* The gang header's bps point to its gang members, which hold the data.
|
|
*
|
|
* Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
|
|
* as the verifier to ensure uniqueness of the SHA256 checksum.
|
|
* Critically, the gang block bp's blk_cksum is the checksum of the data,
|
|
* not the gang header. This ensures that data block signatures (needed for
|
|
* deduplication) are independent of how the block is physically stored.
|
|
*
|
|
* Gang blocks can be nested: a gang member may itself be a gang block.
|
|
* Thus every gang block is a tree in which root and all interior nodes are
|
|
* gang headers, and the leaves are normal blocks that contain user data.
|
|
* The root of the gang tree is called the gang leader.
|
|
*
|
|
* To perform any operation (read, rewrite, free, claim) on a gang block,
|
|
* zio_gang_assemble() first assembles the gang tree (minus data leaves)
|
|
* in the io_gang_tree field of the original logical i/o by recursively
|
|
* reading the gang leader and all gang headers below it. This yields
|
|
* an in-core tree containing the contents of every gang header and the
|
|
* bps for every constituent of the gang block.
|
|
*
|
|
* With the gang tree now assembled, zio_gang_issue() just walks the gang tree
|
|
* and invokes a callback on each bp. To free a gang block, zio_gang_issue()
|
|
* calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
|
|
* zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
|
|
* zio_read_gang() is a wrapper around zio_read() that omits reading gang
|
|
* headers, since we already have those in io_gang_tree. zio_rewrite_gang()
|
|
* performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
|
|
* of the gang header plus zio_checksum_compute() of the data to update the
|
|
* gang header's blk_cksum as described above.
|
|
*
|
|
* The two-phase assemble/issue model solves the problem of partial failure --
|
|
* what if you'd freed part of a gang block but then couldn't read the
|
|
* gang header for another part? Assembling the entire gang tree first
|
|
* ensures that all the necessary gang header I/O has succeeded before
|
|
* starting the actual work of free, claim, or write. Once the gang tree
|
|
* is assembled, free and claim are in-memory operations that cannot fail.
|
|
*
|
|
* In the event that a gang write fails, zio_dva_unallocate() walks the
|
|
* gang tree to immediately free (i.e. insert back into the space map)
|
|
* everything we've allocated. This ensures that we don't get ENOSPC
|
|
* errors during repeated suspend/resume cycles due to a flaky device.
|
|
*
|
|
* Gang rewrites only happen during sync-to-convergence. If we can't assemble
|
|
* the gang tree, we won't modify the block, so we can safely defer the free
|
|
* (knowing that the block is still intact). If we *can* assemble the gang
|
|
* tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
|
|
* each constituent bp and we can allocate a new block on the next sync pass.
|
|
*
|
|
* In all cases, the gang tree allows complete recovery from partial failure.
|
|
* ==========================================================================
|
|
*/
|
|
|
|
static void
|
|
zio_gang_issue_func_done(zio_t *zio)
|
|
{
|
|
abd_put(zio->io_abd);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data,
|
|
uint64_t offset)
|
|
{
|
|
if (gn != NULL)
|
|
return (pio);
|
|
|
|
return (zio_read(pio, pio->io_spa, bp, abd_get_offset(data, offset),
|
|
BP_GET_PSIZE(bp), zio_gang_issue_func_done,
|
|
NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio),
|
|
&pio->io_bookmark));
|
|
}
|
|
|
|
static zio_t *
|
|
zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data,
|
|
uint64_t offset)
|
|
{
|
|
zio_t *zio;
|
|
|
|
if (gn != NULL) {
|
|
abd_t *gbh_abd =
|
|
abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE);
|
|
zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp,
|
|
gbh_abd, SPA_GANGBLOCKSIZE, zio_gang_issue_func_done, NULL,
|
|
pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio),
|
|
&pio->io_bookmark);
|
|
/*
|
|
* As we rewrite each gang header, the pipeline will compute
|
|
* a new gang block header checksum for it; but no one will
|
|
* compute a new data checksum, so we do that here. The one
|
|
* exception is the gang leader: the pipeline already computed
|
|
* its data checksum because that stage precedes gang assembly.
|
|
* (Presently, nothing actually uses interior data checksums;
|
|
* this is just good hygiene.)
|
|
*/
|
|
if (gn != pio->io_gang_leader->io_gang_tree) {
|
|
abd_t *buf = abd_get_offset(data, offset);
|
|
|
|
zio_checksum_compute(zio, BP_GET_CHECKSUM(bp),
|
|
buf, BP_GET_PSIZE(bp));
|
|
|
|
abd_put(buf);
|
|
}
|
|
/*
|
|
* If we are here to damage data for testing purposes,
|
|
* leave the GBH alone so that we can detect the damage.
|
|
*/
|
|
if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE)
|
|
zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
|
|
} else {
|
|
zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp,
|
|
abd_get_offset(data, offset), BP_GET_PSIZE(bp),
|
|
zio_gang_issue_func_done, NULL, pio->io_priority,
|
|
ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static zio_t *
|
|
zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data,
|
|
uint64_t offset)
|
|
{
|
|
zio_t *zio = zio_free_sync(pio, pio->io_spa, pio->io_txg, bp,
|
|
ZIO_GANG_CHILD_FLAGS(pio));
|
|
if (zio == NULL) {
|
|
zio = zio_null(pio, pio->io_spa,
|
|
NULL, NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio));
|
|
}
|
|
return (zio);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static zio_t *
|
|
zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data,
|
|
uint64_t offset)
|
|
{
|
|
return (zio_claim(pio, pio->io_spa, pio->io_txg, bp,
|
|
NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio)));
|
|
}
|
|
|
|
static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = {
|
|
NULL,
|
|
zio_read_gang,
|
|
zio_rewrite_gang,
|
|
zio_free_gang,
|
|
zio_claim_gang,
|
|
NULL
|
|
};
|
|
|
|
static void zio_gang_tree_assemble_done(zio_t *zio);
|
|
|
|
static zio_gang_node_t *
|
|
zio_gang_node_alloc(zio_gang_node_t **gnpp)
|
|
{
|
|
zio_gang_node_t *gn;
|
|
|
|
ASSERT(*gnpp == NULL);
|
|
|
|
gn = kmem_zalloc(sizeof (*gn), KM_SLEEP);
|
|
gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE);
|
|
*gnpp = gn;
|
|
|
|
return (gn);
|
|
}
|
|
|
|
static void
|
|
zio_gang_node_free(zio_gang_node_t **gnpp)
|
|
{
|
|
zio_gang_node_t *gn = *gnpp;
|
|
|
|
for (int g = 0; g < SPA_GBH_NBLKPTRS; g++)
|
|
ASSERT(gn->gn_child[g] == NULL);
|
|
|
|
zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE);
|
|
kmem_free(gn, sizeof (*gn));
|
|
*gnpp = NULL;
|
|
}
|
|
|
|
static void
|
|
zio_gang_tree_free(zio_gang_node_t **gnpp)
|
|
{
|
|
zio_gang_node_t *gn = *gnpp;
|
|
|
|
if (gn == NULL)
|
|
return;
|
|
|
|
for (int g = 0; g < SPA_GBH_NBLKPTRS; g++)
|
|
zio_gang_tree_free(&gn->gn_child[g]);
|
|
|
|
zio_gang_node_free(gnpp);
|
|
}
|
|
|
|
static void
|
|
zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp)
|
|
{
|
|
zio_gang_node_t *gn = zio_gang_node_alloc(gnpp);
|
|
abd_t *gbh_abd = abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE);
|
|
|
|
ASSERT(gio->io_gang_leader == gio);
|
|
ASSERT(BP_IS_GANG(bp));
|
|
|
|
zio_nowait(zio_read(gio, gio->io_spa, bp, gbh_abd, SPA_GANGBLOCKSIZE,
|
|
zio_gang_tree_assemble_done, gn, gio->io_priority,
|
|
ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark));
|
|
}
|
|
|
|
static void
|
|
zio_gang_tree_assemble_done(zio_t *zio)
|
|
{
|
|
zio_t *gio = zio->io_gang_leader;
|
|
zio_gang_node_t *gn = zio->io_private;
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
ASSERT(gio == zio_unique_parent(zio));
|
|
ASSERT(zio->io_child_count == 0);
|
|
|
|
if (zio->io_error)
|
|
return;
|
|
|
|
/* this ABD was created from a linear buf in zio_gang_tree_assemble */
|
|
if (BP_SHOULD_BYTESWAP(bp))
|
|
byteswap_uint64_array(abd_to_buf(zio->io_abd), zio->io_size);
|
|
|
|
ASSERT3P(abd_to_buf(zio->io_abd), ==, gn->gn_gbh);
|
|
ASSERT(zio->io_size == SPA_GANGBLOCKSIZE);
|
|
ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC);
|
|
|
|
abd_put(zio->io_abd);
|
|
|
|
for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
|
|
blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g];
|
|
if (!BP_IS_GANG(gbp))
|
|
continue;
|
|
zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]);
|
|
}
|
|
}
|
|
|
|
static void
|
|
zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, abd_t *data,
|
|
uint64_t offset)
|
|
{
|
|
zio_t *gio = pio->io_gang_leader;
|
|
zio_t *zio;
|
|
|
|
ASSERT(BP_IS_GANG(bp) == !!gn);
|
|
ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp));
|
|
ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree);
|
|
|
|
/*
|
|
* If you're a gang header, your data is in gn->gn_gbh.
|
|
* If you're a gang member, your data is in 'data' and gn == NULL.
|
|
*/
|
|
zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data, offset);
|
|
|
|
if (gn != NULL) {
|
|
ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC);
|
|
|
|
for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
|
|
blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g];
|
|
if (BP_IS_HOLE(gbp))
|
|
continue;
|
|
zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data,
|
|
offset);
|
|
offset += BP_GET_PSIZE(gbp);
|
|
}
|
|
}
|
|
|
|
if (gn == gio->io_gang_tree)
|
|
ASSERT3U(gio->io_size, ==, offset);
|
|
|
|
if (zio != pio)
|
|
zio_nowait(zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_gang_assemble(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL);
|
|
ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
|
|
|
|
zio->io_gang_leader = zio;
|
|
|
|
zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_gang_issue(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT, ZIO_WAIT_DONE)) {
|
|
return (NULL);
|
|
}
|
|
|
|
ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio);
|
|
ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
|
|
|
|
if (zio->io_child_error[ZIO_CHILD_GANG] == 0)
|
|
zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_abd,
|
|
0);
|
|
else
|
|
zio_gang_tree_free(&zio->io_gang_tree);
|
|
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static void
|
|
zio_write_gang_member_ready(zio_t *zio)
|
|
{
|
|
zio_t *pio = zio_unique_parent(zio);
|
|
dva_t *cdva = zio->io_bp->blk_dva;
|
|
dva_t *pdva = pio->io_bp->blk_dva;
|
|
uint64_t asize;
|
|
zio_t *gio __maybe_unused = zio->io_gang_leader;
|
|
|
|
if (BP_IS_HOLE(zio->io_bp))
|
|
return;
|
|
|
|
ASSERT(BP_IS_HOLE(&zio->io_bp_orig));
|
|
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_GANG);
|
|
ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies);
|
|
ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp));
|
|
ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp));
|
|
ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp));
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) {
|
|
ASSERT(DVA_GET_GANG(&pdva[d]));
|
|
asize = DVA_GET_ASIZE(&pdva[d]);
|
|
asize += DVA_GET_ASIZE(&cdva[d]);
|
|
DVA_SET_ASIZE(&pdva[d], asize);
|
|
}
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
|
|
static void
|
|
zio_write_gang_done(zio_t *zio)
|
|
{
|
|
/*
|
|
* The io_abd field will be NULL for a zio with no data. The io_flags
|
|
* will initially have the ZIO_FLAG_NODATA bit flag set, but we can't
|
|
* check for it here as it is cleared in zio_ready.
|
|
*/
|
|
if (zio->io_abd != NULL)
|
|
abd_put(zio->io_abd);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_write_gang_block(zio_t *pio)
|
|
{
|
|
spa_t *spa = pio->io_spa;
|
|
metaslab_class_t *mc = spa_normal_class(spa);
|
|
blkptr_t *bp = pio->io_bp;
|
|
zio_t *gio = pio->io_gang_leader;
|
|
zio_t *zio;
|
|
zio_gang_node_t *gn, **gnpp;
|
|
zio_gbh_phys_t *gbh;
|
|
abd_t *gbh_abd;
|
|
uint64_t txg = pio->io_txg;
|
|
uint64_t resid = pio->io_size;
|
|
uint64_t lsize;
|
|
int copies = gio->io_prop.zp_copies;
|
|
int gbh_copies;
|
|
zio_prop_t zp;
|
|
int error;
|
|
boolean_t has_data = !(pio->io_flags & ZIO_FLAG_NODATA);
|
|
|
|
/*
|
|
* encrypted blocks need DVA[2] free so encrypted gang headers can't
|
|
* have a third copy.
|
|
*/
|
|
gbh_copies = MIN(copies + 1, spa_max_replication(spa));
|
|
if (gio->io_prop.zp_encrypt && gbh_copies >= SPA_DVAS_PER_BP)
|
|
gbh_copies = SPA_DVAS_PER_BP - 1;
|
|
|
|
int flags = METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER;
|
|
if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
|
ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(has_data);
|
|
|
|
flags |= METASLAB_ASYNC_ALLOC;
|
|
VERIFY(zfs_refcount_held(&mc->mc_alloc_slots[pio->io_allocator],
|
|
pio));
|
|
|
|
/*
|
|
* The logical zio has already placed a reservation for
|
|
* 'copies' allocation slots but gang blocks may require
|
|
* additional copies. These additional copies
|
|
* (i.e. gbh_copies - copies) are guaranteed to succeed
|
|
* since metaslab_class_throttle_reserve() always allows
|
|
* additional reservations for gang blocks.
|
|
*/
|
|
VERIFY(metaslab_class_throttle_reserve(mc, gbh_copies - copies,
|
|
pio->io_allocator, pio, flags));
|
|
}
|
|
|
|
error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE,
|
|
bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags,
|
|
&pio->io_alloc_list, pio, pio->io_allocator);
|
|
if (error) {
|
|
if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
|
ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(has_data);
|
|
|
|
/*
|
|
* If we failed to allocate the gang block header then
|
|
* we remove any additional allocation reservations that
|
|
* we placed here. The original reservation will
|
|
* be removed when the logical I/O goes to the ready
|
|
* stage.
|
|
*/
|
|
metaslab_class_throttle_unreserve(mc,
|
|
gbh_copies - copies, pio->io_allocator, pio);
|
|
}
|
|
|
|
pio->io_error = error;
|
|
return (pio);
|
|
}
|
|
|
|
if (pio == gio) {
|
|
gnpp = &gio->io_gang_tree;
|
|
} else {
|
|
gnpp = pio->io_private;
|
|
ASSERT(pio->io_ready == zio_write_gang_member_ready);
|
|
}
|
|
|
|
gn = zio_gang_node_alloc(gnpp);
|
|
gbh = gn->gn_gbh;
|
|
bzero(gbh, SPA_GANGBLOCKSIZE);
|
|
gbh_abd = abd_get_from_buf(gbh, SPA_GANGBLOCKSIZE);
|
|
|
|
/*
|
|
* Create the gang header.
|
|
*/
|
|
zio = zio_rewrite(pio, spa, txg, bp, gbh_abd, SPA_GANGBLOCKSIZE,
|
|
zio_write_gang_done, NULL, pio->io_priority,
|
|
ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);
|
|
|
|
/*
|
|
* Create and nowait the gang children.
|
|
*/
|
|
for (int g = 0; resid != 0; resid -= lsize, g++) {
|
|
lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g),
|
|
SPA_MINBLOCKSIZE);
|
|
ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid);
|
|
|
|
zp.zp_checksum = gio->io_prop.zp_checksum;
|
|
zp.zp_compress = ZIO_COMPRESS_OFF;
|
|
zp.zp_type = DMU_OT_NONE;
|
|
zp.zp_level = 0;
|
|
zp.zp_copies = gio->io_prop.zp_copies;
|
|
zp.zp_dedup = B_FALSE;
|
|
zp.zp_dedup_verify = B_FALSE;
|
|
zp.zp_nopwrite = B_FALSE;
|
|
zp.zp_encrypt = gio->io_prop.zp_encrypt;
|
|
zp.zp_byteorder = gio->io_prop.zp_byteorder;
|
|
bzero(zp.zp_salt, ZIO_DATA_SALT_LEN);
|
|
bzero(zp.zp_iv, ZIO_DATA_IV_LEN);
|
|
bzero(zp.zp_mac, ZIO_DATA_MAC_LEN);
|
|
|
|
zio_t *cio = zio_write(zio, spa, txg, &gbh->zg_blkptr[g],
|
|
has_data ? abd_get_offset(pio->io_abd, pio->io_size -
|
|
resid) : NULL, lsize, lsize, &zp,
|
|
zio_write_gang_member_ready, NULL, NULL,
|
|
zio_write_gang_done, &gn->gn_child[g], pio->io_priority,
|
|
ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);
|
|
|
|
if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
|
ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(has_data);
|
|
|
|
/*
|
|
* Gang children won't throttle but we should
|
|
* account for their work, so reserve an allocation
|
|
* slot for them here.
|
|
*/
|
|
VERIFY(metaslab_class_throttle_reserve(mc,
|
|
zp.zp_copies, cio->io_allocator, cio, flags));
|
|
}
|
|
zio_nowait(cio);
|
|
}
|
|
|
|
/*
|
|
* Set pio's pipeline to just wait for zio to finish.
|
|
*/
|
|
pio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
|
|
/*
|
|
* We didn't allocate this bp, so make sure it doesn't get unmarked.
|
|
*/
|
|
pio->io_flags &= ~ZIO_FLAG_FASTWRITE;
|
|
|
|
zio_nowait(zio);
|
|
|
|
return (pio);
|
|
}
|
|
|
|
/*
|
|
* The zio_nop_write stage in the pipeline determines if allocating a
|
|
* new bp is necessary. The nopwrite feature can handle writes in
|
|
* either syncing or open context (i.e. zil writes) and as a result is
|
|
* mutually exclusive with dedup.
|
|
*
|
|
* By leveraging a cryptographically secure checksum, such as SHA256, we
|
|
* can compare the checksums of the new data and the old to determine if
|
|
* allocating a new block is required. Note that our requirements for
|
|
* cryptographic strength are fairly weak: there can't be any accidental
|
|
* hash collisions, but we don't need to be secure against intentional
|
|
* (malicious) collisions. To trigger a nopwrite, you have to be able
|
|
* to write the file to begin with, and triggering an incorrect (hash
|
|
* collision) nopwrite is no worse than simply writing to the file.
|
|
* That said, there are no known attacks against the checksum algorithms
|
|
* used for nopwrite, assuming that the salt and the checksums
|
|
* themselves remain secret.
|
|
*/
|
|
static zio_t *
|
|
zio_nop_write(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
blkptr_t *bp_orig = &zio->io_bp_orig;
|
|
zio_prop_t *zp = &zio->io_prop;
|
|
|
|
ASSERT(BP_GET_LEVEL(bp) == 0);
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
|
|
ASSERT(zp->zp_nopwrite);
|
|
ASSERT(!zp->zp_dedup);
|
|
ASSERT(zio->io_bp_override == NULL);
|
|
ASSERT(IO_IS_ALLOCATING(zio));
|
|
|
|
/*
|
|
* Check to see if the original bp and the new bp have matching
|
|
* characteristics (i.e. same checksum, compression algorithms, etc).
|
|
* If they don't then just continue with the pipeline which will
|
|
* allocate a new bp.
|
|
*/
|
|
if (BP_IS_HOLE(bp_orig) ||
|
|
!(zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_flags &
|
|
ZCHECKSUM_FLAG_NOPWRITE) ||
|
|
BP_IS_ENCRYPTED(bp) || BP_IS_ENCRYPTED(bp_orig) ||
|
|
BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) ||
|
|
BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) ||
|
|
BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) ||
|
|
zp->zp_copies != BP_GET_NDVAS(bp_orig))
|
|
return (zio);
|
|
|
|
/*
|
|
* If the checksums match then reset the pipeline so that we
|
|
* avoid allocating a new bp and issuing any I/O.
|
|
*/
|
|
if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) {
|
|
ASSERT(zio_checksum_table[zp->zp_checksum].ci_flags &
|
|
ZCHECKSUM_FLAG_NOPWRITE);
|
|
ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig));
|
|
ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig));
|
|
ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF);
|
|
ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop,
|
|
sizeof (uint64_t)) == 0);
|
|
|
|
/*
|
|
* If we're overwriting a block that is currently on an
|
|
* indirect vdev, then ignore the nopwrite request and
|
|
* allow a new block to be allocated on a concrete vdev.
|
|
*/
|
|
spa_config_enter(zio->io_spa, SCL_VDEV, FTAG, RW_READER);
|
|
vdev_t *tvd = vdev_lookup_top(zio->io_spa,
|
|
DVA_GET_VDEV(&bp->blk_dva[0]));
|
|
if (tvd->vdev_ops == &vdev_indirect_ops) {
|
|
spa_config_exit(zio->io_spa, SCL_VDEV, FTAG);
|
|
return (zio);
|
|
}
|
|
spa_config_exit(zio->io_spa, SCL_VDEV, FTAG);
|
|
|
|
*bp = *bp_orig;
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
zio->io_flags |= ZIO_FLAG_NOPWRITE;
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Dedup
|
|
* ==========================================================================
|
|
*/
|
|
static void
|
|
zio_ddt_child_read_done(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
ddt_entry_t *dde = zio->io_private;
|
|
ddt_phys_t *ddp;
|
|
zio_t *pio = zio_unique_parent(zio);
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
ddp = ddt_phys_select(dde, bp);
|
|
if (zio->io_error == 0)
|
|
ddt_phys_clear(ddp); /* this ddp doesn't need repair */
|
|
|
|
if (zio->io_error == 0 && dde->dde_repair_abd == NULL)
|
|
dde->dde_repair_abd = zio->io_abd;
|
|
else
|
|
abd_free(zio->io_abd);
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_ddt_read_start(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
ASSERT(BP_GET_DEDUP(bp));
|
|
ASSERT(BP_GET_PSIZE(bp) == zio->io_size);
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
if (zio->io_child_error[ZIO_CHILD_DDT]) {
|
|
ddt_t *ddt = ddt_select(zio->io_spa, bp);
|
|
ddt_entry_t *dde = ddt_repair_start(ddt, bp);
|
|
ddt_phys_t *ddp = dde->dde_phys;
|
|
ddt_phys_t *ddp_self = ddt_phys_select(dde, bp);
|
|
blkptr_t blk;
|
|
|
|
ASSERT(zio->io_vsd == NULL);
|
|
zio->io_vsd = dde;
|
|
|
|
if (ddp_self == NULL)
|
|
return (zio);
|
|
|
|
for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
|
|
if (ddp->ddp_phys_birth == 0 || ddp == ddp_self)
|
|
continue;
|
|
ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp,
|
|
&blk);
|
|
zio_nowait(zio_read(zio, zio->io_spa, &blk,
|
|
abd_alloc_for_io(zio->io_size, B_TRUE),
|
|
zio->io_size, zio_ddt_child_read_done, dde,
|
|
zio->io_priority, ZIO_DDT_CHILD_FLAGS(zio) |
|
|
ZIO_FLAG_DONT_PROPAGATE, &zio->io_bookmark));
|
|
}
|
|
return (zio);
|
|
}
|
|
|
|
zio_nowait(zio_read(zio, zio->io_spa, bp,
|
|
zio->io_abd, zio->io_size, NULL, NULL, zio->io_priority,
|
|
ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark));
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_ddt_read_done(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_DDT_BIT, ZIO_WAIT_DONE)) {
|
|
return (NULL);
|
|
}
|
|
|
|
ASSERT(BP_GET_DEDUP(bp));
|
|
ASSERT(BP_GET_PSIZE(bp) == zio->io_size);
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
if (zio->io_child_error[ZIO_CHILD_DDT]) {
|
|
ddt_t *ddt = ddt_select(zio->io_spa, bp);
|
|
ddt_entry_t *dde = zio->io_vsd;
|
|
if (ddt == NULL) {
|
|
ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE);
|
|
return (zio);
|
|
}
|
|
if (dde == NULL) {
|
|
zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1;
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE);
|
|
return (NULL);
|
|
}
|
|
if (dde->dde_repair_abd != NULL) {
|
|
abd_copy(zio->io_abd, dde->dde_repair_abd,
|
|
zio->io_size);
|
|
zio->io_child_error[ZIO_CHILD_DDT] = 0;
|
|
}
|
|
ddt_repair_done(ddt, dde);
|
|
zio->io_vsd = NULL;
|
|
}
|
|
|
|
ASSERT(zio->io_vsd == NULL);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static boolean_t
|
|
zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
boolean_t do_raw = !!(zio->io_flags & ZIO_FLAG_RAW);
|
|
|
|
ASSERT(!(zio->io_bp_override && do_raw));
|
|
|
|
/*
|
|
* Note: we compare the original data, not the transformed data,
|
|
* because when zio->io_bp is an override bp, we will not have
|
|
* pushed the I/O transforms. That's an important optimization
|
|
* because otherwise we'd compress/encrypt all dmu_sync() data twice.
|
|
* However, we should never get a raw, override zio so in these
|
|
* cases we can compare the io_abd directly. This is useful because
|
|
* it allows us to do dedup verification even if we don't have access
|
|
* to the original data (for instance, if the encryption keys aren't
|
|
* loaded).
|
|
*/
|
|
|
|
for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
|
|
zio_t *lio = dde->dde_lead_zio[p];
|
|
|
|
if (lio != NULL && do_raw) {
|
|
return (lio->io_size != zio->io_size ||
|
|
abd_cmp(zio->io_abd, lio->io_abd) != 0);
|
|
} else if (lio != NULL) {
|
|
return (lio->io_orig_size != zio->io_orig_size ||
|
|
abd_cmp(zio->io_orig_abd, lio->io_orig_abd) != 0);
|
|
}
|
|
}
|
|
|
|
for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
|
|
ddt_phys_t *ddp = &dde->dde_phys[p];
|
|
|
|
if (ddp->ddp_phys_birth != 0 && do_raw) {
|
|
blkptr_t blk = *zio->io_bp;
|
|
uint64_t psize;
|
|
abd_t *tmpabd;
|
|
int error;
|
|
|
|
ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth);
|
|
psize = BP_GET_PSIZE(&blk);
|
|
|
|
if (psize != zio->io_size)
|
|
return (B_TRUE);
|
|
|
|
ddt_exit(ddt);
|
|
|
|
tmpabd = abd_alloc_for_io(psize, B_TRUE);
|
|
|
|
error = zio_wait(zio_read(NULL, spa, &blk, tmpabd,
|
|
psize, NULL, NULL, ZIO_PRIORITY_SYNC_READ,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE |
|
|
ZIO_FLAG_RAW, &zio->io_bookmark));
|
|
|
|
if (error == 0) {
|
|
if (abd_cmp(tmpabd, zio->io_abd) != 0)
|
|
error = SET_ERROR(ENOENT);
|
|
}
|
|
|
|
abd_free(tmpabd);
|
|
ddt_enter(ddt);
|
|
return (error != 0);
|
|
} else if (ddp->ddp_phys_birth != 0) {
|
|
arc_buf_t *abuf = NULL;
|
|
arc_flags_t aflags = ARC_FLAG_WAIT;
|
|
blkptr_t blk = *zio->io_bp;
|
|
int error;
|
|
|
|
ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth);
|
|
|
|
if (BP_GET_LSIZE(&blk) != zio->io_orig_size)
|
|
return (B_TRUE);
|
|
|
|
ddt_exit(ddt);
|
|
|
|
error = arc_read(NULL, spa, &blk,
|
|
arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
|
|
&aflags, &zio->io_bookmark);
|
|
|
|
if (error == 0) {
|
|
if (abd_cmp_buf(zio->io_orig_abd, abuf->b_data,
|
|
zio->io_orig_size) != 0)
|
|
error = SET_ERROR(ENOENT);
|
|
arc_buf_destroy(abuf, &abuf);
|
|
}
|
|
|
|
ddt_enter(ddt);
|
|
return (error != 0);
|
|
}
|
|
}
|
|
|
|
return (B_FALSE);
|
|
}
|
|
|
|
static void
|
|
zio_ddt_child_write_ready(zio_t *zio)
|
|
{
|
|
int p = zio->io_prop.zp_copies;
|
|
ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp);
|
|
ddt_entry_t *dde = zio->io_private;
|
|
ddt_phys_t *ddp = &dde->dde_phys[p];
|
|
zio_t *pio;
|
|
|
|
if (zio->io_error)
|
|
return;
|
|
|
|
ddt_enter(ddt);
|
|
|
|
ASSERT(dde->dde_lead_zio[p] == zio);
|
|
|
|
ddt_phys_fill(ddp, zio->io_bp);
|
|
|
|
zio_link_t *zl = NULL;
|
|
while ((pio = zio_walk_parents(zio, &zl)) != NULL)
|
|
ddt_bp_fill(ddp, pio->io_bp, zio->io_txg);
|
|
|
|
ddt_exit(ddt);
|
|
}
|
|
|
|
static void
|
|
zio_ddt_child_write_done(zio_t *zio)
|
|
{
|
|
int p = zio->io_prop.zp_copies;
|
|
ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp);
|
|
ddt_entry_t *dde = zio->io_private;
|
|
ddt_phys_t *ddp = &dde->dde_phys[p];
|
|
|
|
ddt_enter(ddt);
|
|
|
|
ASSERT(ddp->ddp_refcnt == 0);
|
|
ASSERT(dde->dde_lead_zio[p] == zio);
|
|
dde->dde_lead_zio[p] = NULL;
|
|
|
|
if (zio->io_error == 0) {
|
|
zio_link_t *zl = NULL;
|
|
while (zio_walk_parents(zio, &zl) != NULL)
|
|
ddt_phys_addref(ddp);
|
|
} else {
|
|
ddt_phys_clear(ddp);
|
|
}
|
|
|
|
ddt_exit(ddt);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_ddt_write(zio_t *zio)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
blkptr_t *bp = zio->io_bp;
|
|
uint64_t txg = zio->io_txg;
|
|
zio_prop_t *zp = &zio->io_prop;
|
|
int p = zp->zp_copies;
|
|
zio_t *cio = NULL;
|
|
ddt_t *ddt = ddt_select(spa, bp);
|
|
ddt_entry_t *dde;
|
|
ddt_phys_t *ddp;
|
|
|
|
ASSERT(BP_GET_DEDUP(bp));
|
|
ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum);
|
|
ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override);
|
|
ASSERT(!(zio->io_bp_override && (zio->io_flags & ZIO_FLAG_RAW)));
|
|
|
|
ddt_enter(ddt);
|
|
dde = ddt_lookup(ddt, bp, B_TRUE);
|
|
ddp = &dde->dde_phys[p];
|
|
|
|
if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) {
|
|
/*
|
|
* If we're using a weak checksum, upgrade to a strong checksum
|
|
* and try again. If we're already using a strong checksum,
|
|
* we can't resolve it, so just convert to an ordinary write.
|
|
* (And automatically e-mail a paper to Nature?)
|
|
*/
|
|
if (!(zio_checksum_table[zp->zp_checksum].ci_flags &
|
|
ZCHECKSUM_FLAG_DEDUP)) {
|
|
zp->zp_checksum = spa_dedup_checksum(spa);
|
|
zio_pop_transforms(zio);
|
|
zio->io_stage = ZIO_STAGE_OPEN;
|
|
BP_ZERO(bp);
|
|
} else {
|
|
zp->zp_dedup = B_FALSE;
|
|
BP_SET_DEDUP(bp, B_FALSE);
|
|
}
|
|
ASSERT(!BP_GET_DEDUP(bp));
|
|
zio->io_pipeline = ZIO_WRITE_PIPELINE;
|
|
ddt_exit(ddt);
|
|
return (zio);
|
|
}
|
|
|
|
if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) {
|
|
if (ddp->ddp_phys_birth != 0)
|
|
ddt_bp_fill(ddp, bp, txg);
|
|
if (dde->dde_lead_zio[p] != NULL)
|
|
zio_add_child(zio, dde->dde_lead_zio[p]);
|
|
else
|
|
ddt_phys_addref(ddp);
|
|
} else if (zio->io_bp_override) {
|
|
ASSERT(bp->blk_birth == txg);
|
|
ASSERT(BP_EQUAL(bp, zio->io_bp_override));
|
|
ddt_phys_fill(ddp, bp);
|
|
ddt_phys_addref(ddp);
|
|
} else {
|
|
cio = zio_write(zio, spa, txg, bp, zio->io_orig_abd,
|
|
zio->io_orig_size, zio->io_orig_size, zp,
|
|
zio_ddt_child_write_ready, NULL, NULL,
|
|
zio_ddt_child_write_done, dde, zio->io_priority,
|
|
ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark);
|
|
|
|
zio_push_transform(cio, zio->io_abd, zio->io_size, 0, NULL);
|
|
dde->dde_lead_zio[p] = cio;
|
|
}
|
|
|
|
ddt_exit(ddt);
|
|
|
|
zio_nowait(cio);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
ddt_entry_t *freedde; /* for debugging */
|
|
|
|
static zio_t *
|
|
zio_ddt_free(zio_t *zio)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
blkptr_t *bp = zio->io_bp;
|
|
ddt_t *ddt = ddt_select(spa, bp);
|
|
ddt_entry_t *dde;
|
|
ddt_phys_t *ddp;
|
|
|
|
ASSERT(BP_GET_DEDUP(bp));
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
ddt_enter(ddt);
|
|
freedde = dde = ddt_lookup(ddt, bp, B_TRUE);
|
|
if (dde) {
|
|
ddp = ddt_phys_select(dde, bp);
|
|
if (ddp)
|
|
ddt_phys_decref(ddp);
|
|
}
|
|
ddt_exit(ddt);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Allocate and free blocks
|
|
* ==========================================================================
|
|
*/
|
|
|
|
static zio_t *
|
|
zio_io_to_allocate(spa_t *spa, int allocator)
|
|
{
|
|
zio_t *zio;
|
|
|
|
ASSERT(MUTEX_HELD(&spa->spa_alloc_locks[allocator]));
|
|
|
|
zio = avl_first(&spa->spa_alloc_trees[allocator]);
|
|
if (zio == NULL)
|
|
return (NULL);
|
|
|
|
ASSERT(IO_IS_ALLOCATING(zio));
|
|
|
|
/*
|
|
* Try to place a reservation for this zio. If we're unable to
|
|
* reserve then we throttle.
|
|
*/
|
|
ASSERT3U(zio->io_allocator, ==, allocator);
|
|
if (!metaslab_class_throttle_reserve(zio->io_metaslab_class,
|
|
zio->io_prop.zp_copies, zio->io_allocator, zio, 0)) {
|
|
return (NULL);
|
|
}
|
|
|
|
avl_remove(&spa->spa_alloc_trees[allocator], zio);
|
|
ASSERT3U(zio->io_stage, <, ZIO_STAGE_DVA_ALLOCATE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_dva_throttle(zio_t *zio)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
zio_t *nio;
|
|
metaslab_class_t *mc;
|
|
|
|
/* locate an appropriate allocation class */
|
|
mc = spa_preferred_class(spa, zio->io_size, zio->io_prop.zp_type,
|
|
zio->io_prop.zp_level, zio->io_prop.zp_zpl_smallblk);
|
|
|
|
if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE ||
|
|
!mc->mc_alloc_throttle_enabled ||
|
|
zio->io_child_type == ZIO_CHILD_GANG ||
|
|
zio->io_flags & ZIO_FLAG_NODATA) {
|
|
return (zio);
|
|
}
|
|
|
|
ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
|
|
|
|
ASSERT3U(zio->io_queued_timestamp, >, 0);
|
|
ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE);
|
|
|
|
zbookmark_phys_t *bm = &zio->io_bookmark;
|
|
/*
|
|
* We want to try to use as many allocators as possible to help improve
|
|
* performance, but we also want logically adjacent IOs to be physically
|
|
* adjacent to improve sequential read performance. We chunk each object
|
|
* into 2^20 block regions, and then hash based on the objset, object,
|
|
* level, and region to accomplish both of these goals.
|
|
*/
|
|
zio->io_allocator = cityhash4(bm->zb_objset, bm->zb_object,
|
|
bm->zb_level, bm->zb_blkid >> 20) % spa->spa_alloc_count;
|
|
mutex_enter(&spa->spa_alloc_locks[zio->io_allocator]);
|
|
ASSERT(zio->io_type == ZIO_TYPE_WRITE);
|
|
zio->io_metaslab_class = mc;
|
|
avl_add(&spa->spa_alloc_trees[zio->io_allocator], zio);
|
|
nio = zio_io_to_allocate(spa, zio->io_allocator);
|
|
mutex_exit(&spa->spa_alloc_locks[zio->io_allocator]);
|
|
return (nio);
|
|
}
|
|
|
|
static void
|
|
zio_allocate_dispatch(spa_t *spa, int allocator)
|
|
{
|
|
zio_t *zio;
|
|
|
|
mutex_enter(&spa->spa_alloc_locks[allocator]);
|
|
zio = zio_io_to_allocate(spa, allocator);
|
|
mutex_exit(&spa->spa_alloc_locks[allocator]);
|
|
if (zio == NULL)
|
|
return;
|
|
|
|
ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE);
|
|
ASSERT0(zio->io_error);
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_TRUE);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_dva_allocate(zio_t *zio)
|
|
{
|
|
spa_t *spa = zio->io_spa;
|
|
metaslab_class_t *mc;
|
|
blkptr_t *bp = zio->io_bp;
|
|
int error;
|
|
int flags = 0;
|
|
|
|
if (zio->io_gang_leader == NULL) {
|
|
ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
|
|
zio->io_gang_leader = zio;
|
|
}
|
|
|
|
ASSERT(BP_IS_HOLE(bp));
|
|
ASSERT0(BP_GET_NDVAS(bp));
|
|
ASSERT3U(zio->io_prop.zp_copies, >, 0);
|
|
ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa));
|
|
ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp));
|
|
|
|
flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0;
|
|
if (zio->io_flags & ZIO_FLAG_NODATA)
|
|
flags |= METASLAB_DONT_THROTTLE;
|
|
if (zio->io_flags & ZIO_FLAG_GANG_CHILD)
|
|
flags |= METASLAB_GANG_CHILD;
|
|
if (zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE)
|
|
flags |= METASLAB_ASYNC_ALLOC;
|
|
|
|
/*
|
|
* if not already chosen, locate an appropriate allocation class
|
|
*/
|
|
mc = zio->io_metaslab_class;
|
|
if (mc == NULL) {
|
|
mc = spa_preferred_class(spa, zio->io_size,
|
|
zio->io_prop.zp_type, zio->io_prop.zp_level,
|
|
zio->io_prop.zp_zpl_smallblk);
|
|
zio->io_metaslab_class = mc;
|
|
}
|
|
|
|
error = metaslab_alloc(spa, mc, zio->io_size, bp,
|
|
zio->io_prop.zp_copies, zio->io_txg, NULL, flags,
|
|
&zio->io_alloc_list, zio, zio->io_allocator);
|
|
|
|
/*
|
|
* Fallback to normal class when an alloc class is full
|
|
*/
|
|
if (error == ENOSPC && mc != spa_normal_class(spa)) {
|
|
/*
|
|
* If throttling, transfer reservation over to normal class.
|
|
* The io_allocator slot can remain the same even though we
|
|
* are switching classes.
|
|
*/
|
|
if (mc->mc_alloc_throttle_enabled &&
|
|
(zio->io_flags & ZIO_FLAG_IO_ALLOCATING)) {
|
|
metaslab_class_throttle_unreserve(mc,
|
|
zio->io_prop.zp_copies, zio->io_allocator, zio);
|
|
zio->io_flags &= ~ZIO_FLAG_IO_ALLOCATING;
|
|
|
|
mc = spa_normal_class(spa);
|
|
VERIFY(metaslab_class_throttle_reserve(mc,
|
|
zio->io_prop.zp_copies, zio->io_allocator, zio,
|
|
flags | METASLAB_MUST_RESERVE));
|
|
} else {
|
|
mc = spa_normal_class(spa);
|
|
}
|
|
zio->io_metaslab_class = mc;
|
|
|
|
error = metaslab_alloc(spa, mc, zio->io_size, bp,
|
|
zio->io_prop.zp_copies, zio->io_txg, NULL, flags,
|
|
&zio->io_alloc_list, zio, zio->io_allocator);
|
|
}
|
|
|
|
if (error != 0) {
|
|
zfs_dbgmsg("%s: metaslab allocation failure: zio %px, "
|
|
"size %llu, error %d", spa_name(spa), zio, zio->io_size,
|
|
error);
|
|
if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE)
|
|
return (zio_write_gang_block(zio));
|
|
zio->io_error = error;
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_dva_free(zio_t *zio)
|
|
{
|
|
metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_dva_claim(zio_t *zio)
|
|
{
|
|
int error;
|
|
|
|
error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg);
|
|
if (error)
|
|
zio->io_error = error;
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Undo an allocation. This is used by zio_done() when an I/O fails
|
|
* and we want to give back the block we just allocated.
|
|
* This handles both normal blocks and gang blocks.
|
|
*/
|
|
static void
|
|
zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp)
|
|
{
|
|
ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp));
|
|
ASSERT(zio->io_bp_override == NULL);
|
|
|
|
if (!BP_IS_HOLE(bp))
|
|
metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE);
|
|
|
|
if (gn != NULL) {
|
|
for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
|
|
zio_dva_unallocate(zio, gn->gn_child[g],
|
|
&gn->gn_gbh->zg_blkptr[g]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to allocate an intent log block. Return 0 on success, errno on failure.
|
|
*/
|
|
int
|
|
zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg, blkptr_t *new_bp,
|
|
uint64_t size, boolean_t *slog)
|
|
{
|
|
int error = 1;
|
|
zio_alloc_list_t io_alloc_list;
|
|
|
|
ASSERT(txg > spa_syncing_txg(spa));
|
|
|
|
metaslab_trace_init(&io_alloc_list);
|
|
|
|
/*
|
|
* Block pointer fields are useful to metaslabs for stats and debugging.
|
|
* Fill in the obvious ones before calling into metaslab_alloc().
|
|
*/
|
|
BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG);
|
|
BP_SET_PSIZE(new_bp, size);
|
|
BP_SET_LEVEL(new_bp, 0);
|
|
|
|
/*
|
|
* When allocating a zil block, we don't have information about
|
|
* the final destination of the block except the objset it's part
|
|
* of, so we just hash the objset ID to pick the allocator to get
|
|
* some parallelism.
|
|
*/
|
|
error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1,
|
|
txg, NULL, METASLAB_FASTWRITE, &io_alloc_list, NULL,
|
|
cityhash4(0, 0, 0, os->os_dsl_dataset->ds_object) %
|
|
spa->spa_alloc_count);
|
|
if (error == 0) {
|
|
*slog = TRUE;
|
|
} else {
|
|
error = metaslab_alloc(spa, spa_normal_class(spa), size,
|
|
new_bp, 1, txg, NULL, METASLAB_FASTWRITE,
|
|
&io_alloc_list, NULL, cityhash4(0, 0, 0,
|
|
os->os_dsl_dataset->ds_object) % spa->spa_alloc_count);
|
|
if (error == 0)
|
|
*slog = FALSE;
|
|
}
|
|
metaslab_trace_fini(&io_alloc_list);
|
|
|
|
if (error == 0) {
|
|
BP_SET_LSIZE(new_bp, size);
|
|
BP_SET_PSIZE(new_bp, size);
|
|
BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF);
|
|
BP_SET_CHECKSUM(new_bp,
|
|
spa_version(spa) >= SPA_VERSION_SLIM_ZIL
|
|
? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG);
|
|
BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG);
|
|
BP_SET_LEVEL(new_bp, 0);
|
|
BP_SET_DEDUP(new_bp, 0);
|
|
BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER);
|
|
|
|
/*
|
|
* encrypted blocks will require an IV and salt. We generate
|
|
* these now since we will not be rewriting the bp at
|
|
* rewrite time.
|
|
*/
|
|
if (os->os_encrypted) {
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
|
|
BP_SET_CRYPT(new_bp, B_TRUE);
|
|
VERIFY0(spa_crypt_get_salt(spa,
|
|
dmu_objset_id(os), salt));
|
|
VERIFY0(zio_crypt_generate_iv(iv));
|
|
|
|
zio_crypt_encode_params_bp(new_bp, salt, iv);
|
|
}
|
|
} else {
|
|
zfs_dbgmsg("%s: zil block allocation failure: "
|
|
"size %llu, error %d", spa_name(spa), size, error);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Read and write to physical devices
|
|
* ==========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Issue an I/O to the underlying vdev. Typically the issue pipeline
|
|
* stops after this stage and will resume upon I/O completion.
|
|
* However, there are instances where the vdev layer may need to
|
|
* continue the pipeline when an I/O was not issued. Since the I/O
|
|
* that was sent to the vdev layer might be different than the one
|
|
* currently active in the pipeline (see vdev_queue_io()), we explicitly
|
|
* force the underlying vdev layers to call either zio_execute() or
|
|
* zio_interrupt() to ensure that the pipeline continues with the correct I/O.
|
|
*/
|
|
static zio_t *
|
|
zio_vdev_io_start(zio_t *zio)
|
|
{
|
|
vdev_t *vd = zio->io_vd;
|
|
uint64_t align;
|
|
spa_t *spa = zio->io_spa;
|
|
|
|
zio->io_delay = 0;
|
|
|
|
ASSERT(zio->io_error == 0);
|
|
ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0);
|
|
|
|
if (vd == NULL) {
|
|
if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER))
|
|
spa_config_enter(spa, SCL_ZIO, zio, RW_READER);
|
|
|
|
/*
|
|
* The mirror_ops handle multiple DVAs in a single BP.
|
|
*/
|
|
vdev_mirror_ops.vdev_op_io_start(zio);
|
|
return (NULL);
|
|
}
|
|
|
|
ASSERT3P(zio->io_logical, !=, zio);
|
|
if (zio->io_type == ZIO_TYPE_WRITE) {
|
|
ASSERT(spa->spa_trust_config);
|
|
|
|
/*
|
|
* Note: the code can handle other kinds of writes,
|
|
* but we don't expect them.
|
|
*/
|
|
if (zio->io_vd->vdev_removing) {
|
|
ASSERT(zio->io_flags &
|
|
(ZIO_FLAG_PHYSICAL | ZIO_FLAG_SELF_HEAL |
|
|
ZIO_FLAG_RESILVER | ZIO_FLAG_INDUCE_DAMAGE));
|
|
}
|
|
}
|
|
|
|
align = 1ULL << vd->vdev_top->vdev_ashift;
|
|
|
|
if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) &&
|
|
P2PHASE(zio->io_size, align) != 0) {
|
|
/* Transform logical writes to be a full physical block size. */
|
|
uint64_t asize = P2ROUNDUP(zio->io_size, align);
|
|
abd_t *abuf = abd_alloc_sametype(zio->io_abd, asize);
|
|
ASSERT(vd == vd->vdev_top);
|
|
if (zio->io_type == ZIO_TYPE_WRITE) {
|
|
abd_copy(abuf, zio->io_abd, zio->io_size);
|
|
abd_zero_off(abuf, zio->io_size, asize - zio->io_size);
|
|
}
|
|
zio_push_transform(zio, abuf, asize, asize, zio_subblock);
|
|
}
|
|
|
|
/*
|
|
* If this is not a physical io, make sure that it is properly aligned
|
|
* before proceeding.
|
|
*/
|
|
if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) {
|
|
ASSERT0(P2PHASE(zio->io_offset, align));
|
|
ASSERT0(P2PHASE(zio->io_size, align));
|
|
} else {
|
|
/*
|
|
* For physical writes, we allow 512b aligned writes and assume
|
|
* the device will perform a read-modify-write as necessary.
|
|
*/
|
|
ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE));
|
|
ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE));
|
|
}
|
|
|
|
VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa));
|
|
|
|
/*
|
|
* If this is a repair I/O, and there's no self-healing involved --
|
|
* that is, we're just resilvering what we expect to resilver --
|
|
* then don't do the I/O unless zio's txg is actually in vd's DTL.
|
|
* This prevents spurious resilvering.
|
|
*
|
|
* There are a few ways that we can end up creating these spurious
|
|
* resilver i/os:
|
|
*
|
|
* 1. A resilver i/o will be issued if any DVA in the BP has a
|
|
* dirty DTL. The mirror code will issue resilver writes to
|
|
* each DVA, including the one(s) that are not on vdevs with dirty
|
|
* DTLs.
|
|
*
|
|
* 2. With nested replication, which happens when we have a
|
|
* "replacing" or "spare" vdev that's a child of a mirror or raidz.
|
|
* For example, given mirror(replacing(A+B), C), it's likely that
|
|
* only A is out of date (it's the new device). In this case, we'll
|
|
* read from C, then use the data to resilver A+B -- but we don't
|
|
* actually want to resilver B, just A. The top-level mirror has no
|
|
* way to know this, so instead we just discard unnecessary repairs
|
|
* as we work our way down the vdev tree.
|
|
*
|
|
* 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc.
|
|
* The same logic applies to any form of nested replication: ditto
|
|
* + mirror, RAID-Z + replacing, etc.
|
|
*
|
|
* However, indirect vdevs point off to other vdevs which may have
|
|
* DTL's, so we never bypass them. The child i/os on concrete vdevs
|
|
* will be properly bypassed instead.
|
|
*/
|
|
if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) &&
|
|
!(zio->io_flags & ZIO_FLAG_SELF_HEAL) &&
|
|
zio->io_txg != 0 && /* not a delegated i/o */
|
|
vd->vdev_ops != &vdev_indirect_ops &&
|
|
!vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) {
|
|
ASSERT(zio->io_type == ZIO_TYPE_WRITE);
|
|
zio_vdev_io_bypass(zio);
|
|
return (zio);
|
|
}
|
|
|
|
if (vd->vdev_ops->vdev_op_leaf && (zio->io_type == ZIO_TYPE_READ ||
|
|
zio->io_type == ZIO_TYPE_WRITE || zio->io_type == ZIO_TYPE_TRIM)) {
|
|
|
|
if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio))
|
|
return (zio);
|
|
|
|
if ((zio = vdev_queue_io(zio)) == NULL)
|
|
return (NULL);
|
|
|
|
if (!vdev_accessible(vd, zio)) {
|
|
zio->io_error = SET_ERROR(ENXIO);
|
|
zio_interrupt(zio);
|
|
return (NULL);
|
|
}
|
|
zio->io_delay = gethrtime();
|
|
}
|
|
|
|
vd->vdev_ops->vdev_op_io_start(zio);
|
|
return (NULL);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_vdev_io_done(zio_t *zio)
|
|
{
|
|
vdev_t *vd = zio->io_vd;
|
|
vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops;
|
|
boolean_t unexpected_error = B_FALSE;
|
|
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) {
|
|
return (NULL);
|
|
}
|
|
|
|
ASSERT(zio->io_type == ZIO_TYPE_READ ||
|
|
zio->io_type == ZIO_TYPE_WRITE || zio->io_type == ZIO_TYPE_TRIM);
|
|
|
|
if (zio->io_delay)
|
|
zio->io_delay = gethrtime() - zio->io_delay;
|
|
|
|
if (vd != NULL && vd->vdev_ops->vdev_op_leaf) {
|
|
|
|
vdev_queue_io_done(zio);
|
|
|
|
if (zio->io_type == ZIO_TYPE_WRITE)
|
|
vdev_cache_write(zio);
|
|
|
|
if (zio_injection_enabled && zio->io_error == 0)
|
|
zio->io_error = zio_handle_device_injections(vd, zio,
|
|
EIO, EILSEQ);
|
|
|
|
if (zio_injection_enabled && zio->io_error == 0)
|
|
zio->io_error = zio_handle_label_injection(zio, EIO);
|
|
|
|
if (zio->io_error && zio->io_type != ZIO_TYPE_TRIM) {
|
|
if (!vdev_accessible(vd, zio)) {
|
|
zio->io_error = SET_ERROR(ENXIO);
|
|
} else {
|
|
unexpected_error = B_TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
ops->vdev_op_io_done(zio);
|
|
|
|
if (unexpected_error)
|
|
VERIFY(vdev_probe(vd, zio) == NULL);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* This function is used to change the priority of an existing zio that is
|
|
* currently in-flight. This is used by the arc to upgrade priority in the
|
|
* event that a demand read is made for a block that is currently queued
|
|
* as a scrub or async read IO. Otherwise, the high priority read request
|
|
* would end up having to wait for the lower priority IO.
|
|
*/
|
|
void
|
|
zio_change_priority(zio_t *pio, zio_priority_t priority)
|
|
{
|
|
zio_t *cio, *cio_next;
|
|
zio_link_t *zl = NULL;
|
|
|
|
ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
|
|
|
|
if (pio->io_vd != NULL && pio->io_vd->vdev_ops->vdev_op_leaf) {
|
|
vdev_queue_change_io_priority(pio, priority);
|
|
} else {
|
|
pio->io_priority = priority;
|
|
}
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
|
|
cio_next = zio_walk_children(pio, &zl);
|
|
zio_change_priority(cio, priority);
|
|
}
|
|
mutex_exit(&pio->io_lock);
|
|
}
|
|
|
|
/*
|
|
* For non-raidz ZIOs, we can just copy aside the bad data read from the
|
|
* disk, and use that to finish the checksum ereport later.
|
|
*/
|
|
static void
|
|
zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr,
|
|
const abd_t *good_buf)
|
|
{
|
|
/* no processing needed */
|
|
zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored)
|
|
{
|
|
void *abd = abd_alloc_sametype(zio->io_abd, zio->io_size);
|
|
|
|
abd_copy(abd, zio->io_abd, zio->io_size);
|
|
|
|
zcr->zcr_cbinfo = zio->io_size;
|
|
zcr->zcr_cbdata = abd;
|
|
zcr->zcr_finish = zio_vsd_default_cksum_finish;
|
|
zcr->zcr_free = zio_abd_free;
|
|
}
|
|
|
|
static zio_t *
|
|
zio_vdev_io_assess(zio_t *zio)
|
|
{
|
|
vdev_t *vd = zio->io_vd;
|
|
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) {
|
|
return (NULL);
|
|
}
|
|
|
|
if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER))
|
|
spa_config_exit(zio->io_spa, SCL_ZIO, zio);
|
|
|
|
if (zio->io_vsd != NULL) {
|
|
zio->io_vsd_ops->vsd_free(zio);
|
|
zio->io_vsd = NULL;
|
|
}
|
|
|
|
if (zio_injection_enabled && zio->io_error == 0)
|
|
zio->io_error = zio_handle_fault_injection(zio, EIO);
|
|
|
|
/*
|
|
* If the I/O failed, determine whether we should attempt to retry it.
|
|
*
|
|
* On retry, we cut in line in the issue queue, since we don't want
|
|
* compression/checksumming/etc. work to prevent our (cheap) IO reissue.
|
|
*/
|
|
if (zio->io_error && vd == NULL &&
|
|
!(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) {
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */
|
|
zio->io_error = 0;
|
|
zio->io_flags |= ZIO_FLAG_IO_RETRY |
|
|
ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE;
|
|
zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1;
|
|
zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE,
|
|
zio_requeue_io_start_cut_in_line);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* If we got an error on a leaf device, convert it to ENXIO
|
|
* if the device is not accessible at all.
|
|
*/
|
|
if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf &&
|
|
!vdev_accessible(vd, zio))
|
|
zio->io_error = SET_ERROR(ENXIO);
|
|
|
|
/*
|
|
* If we can't write to an interior vdev (mirror or RAID-Z),
|
|
* set vdev_cant_write so that we stop trying to allocate from it.
|
|
*/
|
|
if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE &&
|
|
vd != NULL && !vd->vdev_ops->vdev_op_leaf) {
|
|
vd->vdev_cant_write = B_TRUE;
|
|
}
|
|
|
|
/*
|
|
* If a cache flush returns ENOTSUP or ENOTTY, we know that no future
|
|
* attempts will ever succeed. In this case we set a persistent
|
|
* boolean flag so that we don't bother with it in the future.
|
|
*/
|
|
if ((zio->io_error == ENOTSUP || zio->io_error == ENOTTY) &&
|
|
zio->io_type == ZIO_TYPE_IOCTL &&
|
|
zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL)
|
|
vd->vdev_nowritecache = B_TRUE;
|
|
|
|
if (zio->io_error)
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
|
|
if (vd != NULL && vd->vdev_ops->vdev_op_leaf &&
|
|
zio->io_physdone != NULL) {
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED));
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_VDEV);
|
|
zio->io_physdone(zio->io_logical);
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
void
|
|
zio_vdev_io_reissue(zio_t *zio)
|
|
{
|
|
ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START);
|
|
ASSERT(zio->io_error == 0);
|
|
|
|
zio->io_stage >>= 1;
|
|
}
|
|
|
|
void
|
|
zio_vdev_io_redone(zio_t *zio)
|
|
{
|
|
ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE);
|
|
|
|
zio->io_stage >>= 1;
|
|
}
|
|
|
|
void
|
|
zio_vdev_io_bypass(zio_t *zio)
|
|
{
|
|
ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START);
|
|
ASSERT(zio->io_error == 0);
|
|
|
|
zio->io_flags |= ZIO_FLAG_IO_BYPASS;
|
|
zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1;
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Encrypt and store encryption parameters
|
|
* ==========================================================================
|
|
*/
|
|
|
|
|
|
/*
|
|
* This function is used for ZIO_STAGE_ENCRYPT. It is responsible for
|
|
* managing the storage of encryption parameters and passing them to the
|
|
* lower-level encryption functions.
|
|
*/
|
|
static zio_t *
|
|
zio_encrypt(zio_t *zio)
|
|
{
|
|
zio_prop_t *zp = &zio->io_prop;
|
|
spa_t *spa = zio->io_spa;
|
|
blkptr_t *bp = zio->io_bp;
|
|
uint64_t psize = BP_GET_PSIZE(bp);
|
|
uint64_t dsobj = zio->io_bookmark.zb_objset;
|
|
dmu_object_type_t ot = BP_GET_TYPE(bp);
|
|
void *enc_buf = NULL;
|
|
abd_t *eabd = NULL;
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t mac[ZIO_DATA_MAC_LEN];
|
|
boolean_t no_crypt = B_FALSE;
|
|
|
|
/* the root zio already encrypted the data */
|
|
if (zio->io_child_type == ZIO_CHILD_GANG)
|
|
return (zio);
|
|
|
|
/* only ZIL blocks are re-encrypted on rewrite */
|
|
if (!IO_IS_ALLOCATING(zio) && ot != DMU_OT_INTENT_LOG)
|
|
return (zio);
|
|
|
|
if (!(zp->zp_encrypt || BP_IS_ENCRYPTED(bp))) {
|
|
BP_SET_CRYPT(bp, B_FALSE);
|
|
return (zio);
|
|
}
|
|
|
|
/* if we are doing raw encryption set the provided encryption params */
|
|
if (zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) {
|
|
ASSERT0(BP_GET_LEVEL(bp));
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
BP_SET_BYTEORDER(bp, zp->zp_byteorder);
|
|
if (ot != DMU_OT_OBJSET)
|
|
zio_crypt_encode_mac_bp(bp, zp->zp_mac);
|
|
|
|
/* dnode blocks must be written out in the provided byteorder */
|
|
if (zp->zp_byteorder != ZFS_HOST_BYTEORDER &&
|
|
ot == DMU_OT_DNODE) {
|
|
void *bswap_buf = zio_buf_alloc(psize);
|
|
abd_t *babd = abd_get_from_buf(bswap_buf, psize);
|
|
|
|
ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF);
|
|
abd_copy_to_buf(bswap_buf, zio->io_abd, psize);
|
|
dmu_ot_byteswap[DMU_OT_BYTESWAP(ot)].ob_func(bswap_buf,
|
|
psize);
|
|
|
|
abd_take_ownership_of_buf(babd, B_TRUE);
|
|
zio_push_transform(zio, babd, psize, psize, NULL);
|
|
}
|
|
|
|
if (DMU_OT_IS_ENCRYPTED(ot))
|
|
zio_crypt_encode_params_bp(bp, zp->zp_salt, zp->zp_iv);
|
|
return (zio);
|
|
}
|
|
|
|
/* indirect blocks only maintain a cksum of the lower level MACs */
|
|
if (BP_GET_LEVEL(bp) > 0) {
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE,
|
|
zio->io_orig_abd, BP_GET_LSIZE(bp), BP_SHOULD_BYTESWAP(bp),
|
|
mac));
|
|
zio_crypt_encode_mac_bp(bp, mac);
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Objset blocks are a special case since they have 2 256-bit MACs
|
|
* embedded within them.
|
|
*/
|
|
if (ot == DMU_OT_OBJSET) {
|
|
ASSERT0(DMU_OT_IS_ENCRYPTED(ot));
|
|
ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF);
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE, spa, dsobj,
|
|
zio->io_abd, psize, BP_SHOULD_BYTESWAP(bp)));
|
|
return (zio);
|
|
}
|
|
|
|
/* unencrypted object types are only authenticated with a MAC */
|
|
if (!DMU_OT_IS_ENCRYPTED(ot)) {
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
VERIFY0(spa_do_crypt_mac_abd(B_TRUE, spa, dsobj,
|
|
zio->io_abd, psize, mac));
|
|
zio_crypt_encode_mac_bp(bp, mac);
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Later passes of sync-to-convergence may decide to rewrite data
|
|
* in place to avoid more disk reallocations. This presents a problem
|
|
* for encryption because this constitutes rewriting the new data with
|
|
* the same encryption key and IV. However, this only applies to blocks
|
|
* in the MOS (particularly the spacemaps) and we do not encrypt the
|
|
* MOS. We assert that the zio is allocating or an intent log write
|
|
* to enforce this.
|
|
*/
|
|
ASSERT(IO_IS_ALLOCATING(zio) || ot == DMU_OT_INTENT_LOG);
|
|
ASSERT(BP_GET_LEVEL(bp) == 0 || ot == DMU_OT_INTENT_LOG);
|
|
ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION));
|
|
ASSERT3U(psize, !=, 0);
|
|
|
|
enc_buf = zio_buf_alloc(psize);
|
|
eabd = abd_get_from_buf(enc_buf, psize);
|
|
abd_take_ownership_of_buf(eabd, B_TRUE);
|
|
|
|
/*
|
|
* For an explanation of what encryption parameters are stored
|
|
* where, see the block comment in zio_crypt.c.
|
|
*/
|
|
if (ot == DMU_OT_INTENT_LOG) {
|
|
zio_crypt_decode_params_bp(bp, salt, iv);
|
|
} else {
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
}
|
|
|
|
/* Perform the encryption. This should not fail */
|
|
VERIFY0(spa_do_crypt_abd(B_TRUE, spa, &zio->io_bookmark,
|
|
BP_GET_TYPE(bp), BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp),
|
|
salt, iv, mac, psize, zio->io_abd, eabd, &no_crypt));
|
|
|
|
/* encode encryption metadata into the bp */
|
|
if (ot == DMU_OT_INTENT_LOG) {
|
|
/*
|
|
* ZIL blocks store the MAC in the embedded checksum, so the
|
|
* transform must always be applied.
|
|
*/
|
|
zio_crypt_encode_mac_zil(enc_buf, mac);
|
|
zio_push_transform(zio, eabd, psize, psize, NULL);
|
|
} else {
|
|
BP_SET_CRYPT(bp, B_TRUE);
|
|
zio_crypt_encode_params_bp(bp, salt, iv);
|
|
zio_crypt_encode_mac_bp(bp, mac);
|
|
|
|
if (no_crypt) {
|
|
ASSERT3U(ot, ==, DMU_OT_DNODE);
|
|
abd_free(eabd);
|
|
} else {
|
|
zio_push_transform(zio, eabd, psize, psize, NULL);
|
|
}
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Generate and verify checksums
|
|
* ==========================================================================
|
|
*/
|
|
static zio_t *
|
|
zio_checksum_generate(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
enum zio_checksum checksum;
|
|
|
|
if (bp == NULL) {
|
|
/*
|
|
* This is zio_write_phys().
|
|
* We're either generating a label checksum, or none at all.
|
|
*/
|
|
checksum = zio->io_prop.zp_checksum;
|
|
|
|
if (checksum == ZIO_CHECKSUM_OFF)
|
|
return (zio);
|
|
|
|
ASSERT(checksum == ZIO_CHECKSUM_LABEL);
|
|
} else {
|
|
if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) {
|
|
ASSERT(!IO_IS_ALLOCATING(zio));
|
|
checksum = ZIO_CHECKSUM_GANG_HEADER;
|
|
} else {
|
|
checksum = BP_GET_CHECKSUM(bp);
|
|
}
|
|
}
|
|
|
|
zio_checksum_compute(zio, checksum, zio->io_abd, zio->io_size);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_checksum_verify(zio_t *zio)
|
|
{
|
|
zio_bad_cksum_t info;
|
|
blkptr_t *bp = zio->io_bp;
|
|
int error;
|
|
|
|
ASSERT(zio->io_vd != NULL);
|
|
|
|
if (bp == NULL) {
|
|
/*
|
|
* This is zio_read_phys().
|
|
* We're either verifying a label checksum, or nothing at all.
|
|
*/
|
|
if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF)
|
|
return (zio);
|
|
|
|
ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL);
|
|
}
|
|
|
|
if ((error = zio_checksum_error(zio, &info)) != 0) {
|
|
zio->io_error = error;
|
|
if (error == ECKSUM &&
|
|
!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
|
|
mutex_enter(&zio->io_vd->vdev_stat_lock);
|
|
zio->io_vd->vdev_stat.vs_checksum_errors++;
|
|
mutex_exit(&zio->io_vd->vdev_stat_lock);
|
|
|
|
zfs_ereport_start_checksum(zio->io_spa,
|
|
zio->io_vd, &zio->io_bookmark, zio,
|
|
zio->io_offset, zio->io_size, NULL, &info);
|
|
}
|
|
}
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Called by RAID-Z to ensure we don't compute the checksum twice.
|
|
*/
|
|
void
|
|
zio_checksum_verified(zio_t *zio)
|
|
{
|
|
zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY;
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
|
|
* An error of 0 indicates success. ENXIO indicates whole-device failure,
|
|
* which may be transient (e.g. unplugged) or permanent. ECKSUM and EIO
|
|
* indicate errors that are specific to one I/O, and most likely permanent.
|
|
* Any other error is presumed to be worse because we weren't expecting it.
|
|
* ==========================================================================
|
|
*/
|
|
int
|
|
zio_worst_error(int e1, int e2)
|
|
{
|
|
static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO };
|
|
int r1, r2;
|
|
|
|
for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++)
|
|
if (e1 == zio_error_rank[r1])
|
|
break;
|
|
|
|
for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++)
|
|
if (e2 == zio_error_rank[r2])
|
|
break;
|
|
|
|
return (r1 > r2 ? e1 : e2);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* I/O completion
|
|
* ==========================================================================
|
|
*/
|
|
static zio_t *
|
|
zio_ready(zio_t *zio)
|
|
{
|
|
blkptr_t *bp = zio->io_bp;
|
|
zio_t *pio, *pio_next;
|
|
zio_link_t *zl = NULL;
|
|
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT | ZIO_CHILD_DDT_BIT,
|
|
ZIO_WAIT_READY)) {
|
|
return (NULL);
|
|
}
|
|
|
|
if (zio->io_ready) {
|
|
ASSERT(IO_IS_ALLOCATING(zio));
|
|
ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) ||
|
|
(zio->io_flags & ZIO_FLAG_NOPWRITE));
|
|
ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0);
|
|
|
|
zio->io_ready(zio);
|
|
}
|
|
|
|
if (bp != NULL && bp != &zio->io_bp_copy)
|
|
zio->io_bp_copy = *bp;
|
|
|
|
if (zio->io_error != 0) {
|
|
zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
|
|
|
|
if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
|
ASSERT(IO_IS_ALLOCATING(zio));
|
|
ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(zio->io_metaslab_class != NULL);
|
|
|
|
/*
|
|
* We were unable to allocate anything, unreserve and
|
|
* issue the next I/O to allocate.
|
|
*/
|
|
metaslab_class_throttle_unreserve(
|
|
zio->io_metaslab_class, zio->io_prop.zp_copies,
|
|
zio->io_allocator, zio);
|
|
zio_allocate_dispatch(zio->io_spa, zio->io_allocator);
|
|
}
|
|
}
|
|
|
|
mutex_enter(&zio->io_lock);
|
|
zio->io_state[ZIO_WAIT_READY] = 1;
|
|
pio = zio_walk_parents(zio, &zl);
|
|
mutex_exit(&zio->io_lock);
|
|
|
|
/*
|
|
* As we notify zio's parents, new parents could be added.
|
|
* New parents go to the head of zio's io_parent_list, however,
|
|
* so we will (correctly) not notify them. The remainder of zio's
|
|
* io_parent_list, from 'pio_next' onward, cannot change because
|
|
* all parents must wait for us to be done before they can be done.
|
|
*/
|
|
for (; pio != NULL; pio = pio_next) {
|
|
pio_next = zio_walk_parents(zio, &zl);
|
|
zio_notify_parent(pio, zio, ZIO_WAIT_READY, NULL);
|
|
}
|
|
|
|
if (zio->io_flags & ZIO_FLAG_NODATA) {
|
|
if (BP_IS_GANG(bp)) {
|
|
zio->io_flags &= ~ZIO_FLAG_NODATA;
|
|
} else {
|
|
ASSERT((uintptr_t)zio->io_abd < SPA_MAXBLOCKSIZE);
|
|
zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
|
|
}
|
|
}
|
|
|
|
if (zio_injection_enabled &&
|
|
zio->io_spa->spa_syncing_txg == zio->io_txg)
|
|
zio_handle_ignored_writes(zio);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
/*
|
|
* Update the allocation throttle accounting.
|
|
*/
|
|
static void
|
|
zio_dva_throttle_done(zio_t *zio)
|
|
{
|
|
zio_t *lio __maybe_unused = zio->io_logical;
|
|
zio_t *pio = zio_unique_parent(zio);
|
|
vdev_t *vd = zio->io_vd;
|
|
int flags = METASLAB_ASYNC_ALLOC;
|
|
|
|
ASSERT3P(zio->io_bp, !=, NULL);
|
|
ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE);
|
|
ASSERT3U(zio->io_priority, ==, ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV);
|
|
ASSERT(vd != NULL);
|
|
ASSERT3P(vd, ==, vd->vdev_top);
|
|
ASSERT(zio_injection_enabled || !(zio->io_flags & ZIO_FLAG_IO_RETRY));
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR));
|
|
ASSERT(zio->io_flags & ZIO_FLAG_IO_ALLOCATING);
|
|
ASSERT(!(lio->io_flags & ZIO_FLAG_IO_REWRITE));
|
|
ASSERT(!(lio->io_orig_flags & ZIO_FLAG_NODATA));
|
|
|
|
/*
|
|
* Parents of gang children can have two flavors -- ones that
|
|
* allocated the gang header (will have ZIO_FLAG_IO_REWRITE set)
|
|
* and ones that allocated the constituent blocks. The allocation
|
|
* throttle needs to know the allocating parent zio so we must find
|
|
* it here.
|
|
*/
|
|
if (pio->io_child_type == ZIO_CHILD_GANG) {
|
|
/*
|
|
* If our parent is a rewrite gang child then our grandparent
|
|
* would have been the one that performed the allocation.
|
|
*/
|
|
if (pio->io_flags & ZIO_FLAG_IO_REWRITE)
|
|
pio = zio_unique_parent(pio);
|
|
flags |= METASLAB_GANG_CHILD;
|
|
}
|
|
|
|
ASSERT(IO_IS_ALLOCATING(pio));
|
|
ASSERT3P(zio, !=, zio->io_logical);
|
|
ASSERT(zio->io_logical != NULL);
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR));
|
|
ASSERT0(zio->io_flags & ZIO_FLAG_NOPWRITE);
|
|
ASSERT(zio->io_metaslab_class != NULL);
|
|
|
|
mutex_enter(&pio->io_lock);
|
|
metaslab_group_alloc_decrement(zio->io_spa, vd->vdev_id, pio, flags,
|
|
pio->io_allocator, B_TRUE);
|
|
mutex_exit(&pio->io_lock);
|
|
|
|
metaslab_class_throttle_unreserve(zio->io_metaslab_class, 1,
|
|
pio->io_allocator, pio);
|
|
|
|
/*
|
|
* Call into the pipeline to see if there is more work that
|
|
* needs to be done. If there is work to be done it will be
|
|
* dispatched to another taskq thread.
|
|
*/
|
|
zio_allocate_dispatch(zio->io_spa, pio->io_allocator);
|
|
}
|
|
|
|
static zio_t *
|
|
zio_done(zio_t *zio)
|
|
{
|
|
/*
|
|
* Always attempt to keep stack usage minimal here since
|
|
* we can be called recursively up to 19 levels deep.
|
|
*/
|
|
const uint64_t psize = zio->io_size;
|
|
zio_t *pio, *pio_next;
|
|
zio_link_t *zl = NULL;
|
|
|
|
/*
|
|
* If our children haven't all completed,
|
|
* wait for them and then repeat this pipeline stage.
|
|
*/
|
|
if (zio_wait_for_children(zio, ZIO_CHILD_ALL_BITS, ZIO_WAIT_DONE)) {
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* If the allocation throttle is enabled, then update the accounting.
|
|
* We only track child I/Os that are part of an allocating async
|
|
* write. We must do this since the allocation is performed
|
|
* by the logical I/O but the actual write is done by child I/Os.
|
|
*/
|
|
if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING &&
|
|
zio->io_child_type == ZIO_CHILD_VDEV) {
|
|
ASSERT(zio->io_metaslab_class != NULL);
|
|
ASSERT(zio->io_metaslab_class->mc_alloc_throttle_enabled);
|
|
zio_dva_throttle_done(zio);
|
|
}
|
|
|
|
/*
|
|
* If the allocation throttle is enabled, verify that
|
|
* we have decremented the refcounts for every I/O that was throttled.
|
|
*/
|
|
if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
|
ASSERT(zio->io_type == ZIO_TYPE_WRITE);
|
|
ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
|
ASSERT(zio->io_bp != NULL);
|
|
|
|
metaslab_group_alloc_verify(zio->io_spa, zio->io_bp, zio,
|
|
zio->io_allocator);
|
|
VERIFY(zfs_refcount_not_held(
|
|
&zio->io_metaslab_class->mc_alloc_slots[zio->io_allocator],
|
|
zio));
|
|
}
|
|
|
|
|
|
for (int c = 0; c < ZIO_CHILD_TYPES; c++)
|
|
for (int w = 0; w < ZIO_WAIT_TYPES; w++)
|
|
ASSERT(zio->io_children[c][w] == 0);
|
|
|
|
if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) {
|
|
ASSERT(zio->io_bp->blk_pad[0] == 0);
|
|
ASSERT(zio->io_bp->blk_pad[1] == 0);
|
|
ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy,
|
|
sizeof (blkptr_t)) == 0 ||
|
|
(zio->io_bp == zio_unique_parent(zio)->io_bp));
|
|
if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) &&
|
|
zio->io_bp_override == NULL &&
|
|
!(zio->io_flags & ZIO_FLAG_IO_REPAIR)) {
|
|
ASSERT3U(zio->io_prop.zp_copies, <=,
|
|
BP_GET_NDVAS(zio->io_bp));
|
|
ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 ||
|
|
(BP_COUNT_GANG(zio->io_bp) ==
|
|
BP_GET_NDVAS(zio->io_bp)));
|
|
}
|
|
if (zio->io_flags & ZIO_FLAG_NOPWRITE)
|
|
VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig));
|
|
}
|
|
|
|
/*
|
|
* If there were child vdev/gang/ddt errors, they apply to us now.
|
|
*/
|
|
zio_inherit_child_errors(zio, ZIO_CHILD_VDEV);
|
|
zio_inherit_child_errors(zio, ZIO_CHILD_GANG);
|
|
zio_inherit_child_errors(zio, ZIO_CHILD_DDT);
|
|
|
|
/*
|
|
* If the I/O on the transformed data was successful, generate any
|
|
* checksum reports now while we still have the transformed data.
|
|
*/
|
|
if (zio->io_error == 0) {
|
|
while (zio->io_cksum_report != NULL) {
|
|
zio_cksum_report_t *zcr = zio->io_cksum_report;
|
|
uint64_t align = zcr->zcr_align;
|
|
uint64_t asize = P2ROUNDUP(psize, align);
|
|
abd_t *adata = zio->io_abd;
|
|
|
|
if (asize != psize) {
|
|
adata = abd_alloc(asize, B_TRUE);
|
|
abd_copy(adata, zio->io_abd, psize);
|
|
abd_zero_off(adata, psize, asize - psize);
|
|
}
|
|
|
|
zio->io_cksum_report = zcr->zcr_next;
|
|
zcr->zcr_next = NULL;
|
|
zcr->zcr_finish(zcr, adata);
|
|
zfs_ereport_free_checksum(zcr);
|
|
|
|
if (asize != psize)
|
|
abd_free(adata);
|
|
}
|
|
}
|
|
|
|
zio_pop_transforms(zio); /* note: may set zio->io_error */
|
|
|
|
vdev_stat_update(zio, psize);
|
|
|
|
/*
|
|
* If this I/O is attached to a particular vdev is slow, exceeding
|
|
* 30 seconds to complete, post an error described the I/O delay.
|
|
* We ignore these errors if the device is currently unavailable.
|
|
*/
|
|
if (zio->io_delay >= MSEC2NSEC(zio_slow_io_ms)) {
|
|
if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) {
|
|
/*
|
|
* We want to only increment our slow IO counters if
|
|
* the IO is valid (i.e. not if the drive is removed).
|
|
*
|
|
* zfs_ereport_post() will also do these checks, but
|
|
* it can also ratelimit and have other failures, so we
|
|
* need to increment the slow_io counters independent
|
|
* of it.
|
|
*/
|
|
if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY,
|
|
zio->io_spa, zio->io_vd, zio)) {
|
|
mutex_enter(&zio->io_vd->vdev_stat_lock);
|
|
zio->io_vd->vdev_stat.vs_slow_ios++;
|
|
mutex_exit(&zio->io_vd->vdev_stat_lock);
|
|
|
|
zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
|
|
zio->io_spa, zio->io_vd, &zio->io_bookmark,
|
|
zio, 0, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (zio->io_error) {
|
|
/*
|
|
* If this I/O is attached to a particular vdev,
|
|
* generate an error message describing the I/O failure
|
|
* at the block level. We ignore these errors if the
|
|
* device is currently unavailable.
|
|
*/
|
|
if (zio->io_error != ECKSUM && zio->io_vd != NULL &&
|
|
!vdev_is_dead(zio->io_vd)) {
|
|
mutex_enter(&zio->io_vd->vdev_stat_lock);
|
|
if (zio->io_type == ZIO_TYPE_READ) {
|
|
zio->io_vd->vdev_stat.vs_read_errors++;
|
|
} else if (zio->io_type == ZIO_TYPE_WRITE) {
|
|
zio->io_vd->vdev_stat.vs_write_errors++;
|
|
}
|
|
mutex_exit(&zio->io_vd->vdev_stat_lock);
|
|
|
|
zfs_ereport_post(FM_EREPORT_ZFS_IO, zio->io_spa,
|
|
zio->io_vd, &zio->io_bookmark, zio, 0, 0);
|
|
}
|
|
|
|
if ((zio->io_error == EIO || !(zio->io_flags &
|
|
(ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) &&
|
|
zio == zio->io_logical) {
|
|
/*
|
|
* For logical I/O requests, tell the SPA to log the
|
|
* error and generate a logical data ereport.
|
|
*/
|
|
spa_log_error(zio->io_spa, &zio->io_bookmark);
|
|
zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa,
|
|
NULL, &zio->io_bookmark, zio, 0, 0);
|
|
}
|
|
}
|
|
|
|
if (zio->io_error && zio == zio->io_logical) {
|
|
/*
|
|
* Determine whether zio should be reexecuted. This will
|
|
* propagate all the way to the root via zio_notify_parent().
|
|
*/
|
|
ASSERT(zio->io_vd == NULL && zio->io_bp != NULL);
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
if (IO_IS_ALLOCATING(zio) &&
|
|
!(zio->io_flags & ZIO_FLAG_CANFAIL)) {
|
|
if (zio->io_error != ENOSPC)
|
|
zio->io_reexecute |= ZIO_REEXECUTE_NOW;
|
|
else
|
|
zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND;
|
|
}
|
|
|
|
if ((zio->io_type == ZIO_TYPE_READ ||
|
|
zio->io_type == ZIO_TYPE_FREE) &&
|
|
!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) &&
|
|
zio->io_error == ENXIO &&
|
|
spa_load_state(zio->io_spa) == SPA_LOAD_NONE &&
|
|
spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE)
|
|
zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND;
|
|
|
|
if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute)
|
|
zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND;
|
|
|
|
/*
|
|
* Here is a possibly good place to attempt to do
|
|
* either combinatorial reconstruction or error correction
|
|
* based on checksums. It also might be a good place
|
|
* to send out preliminary ereports before we suspend
|
|
* processing.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* If there were logical child errors, they apply to us now.
|
|
* We defer this until now to avoid conflating logical child
|
|
* errors with errors that happened to the zio itself when
|
|
* updating vdev stats and reporting FMA events above.
|
|
*/
|
|
zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL);
|
|
|
|
if ((zio->io_error || zio->io_reexecute) &&
|
|
IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio &&
|
|
!(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)))
|
|
zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp);
|
|
|
|
zio_gang_tree_free(&zio->io_gang_tree);
|
|
|
|
/*
|
|
* Godfather I/Os should never suspend.
|
|
*/
|
|
if ((zio->io_flags & ZIO_FLAG_GODFATHER) &&
|
|
(zio->io_reexecute & ZIO_REEXECUTE_SUSPEND))
|
|
zio->io_reexecute &= ~ZIO_REEXECUTE_SUSPEND;
|
|
|
|
if (zio->io_reexecute) {
|
|
/*
|
|
* This is a logical I/O that wants to reexecute.
|
|
*
|
|
* Reexecute is top-down. When an i/o fails, if it's not
|
|
* the root, it simply notifies its parent and sticks around.
|
|
* The parent, seeing that it still has children in zio_done(),
|
|
* does the same. This percolates all the way up to the root.
|
|
* The root i/o will reexecute or suspend the entire tree.
|
|
*
|
|
* This approach ensures that zio_reexecute() honors
|
|
* all the original i/o dependency relationships, e.g.
|
|
* parents not executing until children are ready.
|
|
*/
|
|
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
zio->io_gang_leader = NULL;
|
|
|
|
mutex_enter(&zio->io_lock);
|
|
zio->io_state[ZIO_WAIT_DONE] = 1;
|
|
mutex_exit(&zio->io_lock);
|
|
|
|
/*
|
|
* "The Godfather" I/O monitors its children but is
|
|
* not a true parent to them. It will track them through
|
|
* the pipeline but severs its ties whenever they get into
|
|
* trouble (e.g. suspended). This allows "The Godfather"
|
|
* I/O to return status without blocking.
|
|
*/
|
|
zl = NULL;
|
|
for (pio = zio_walk_parents(zio, &zl); pio != NULL;
|
|
pio = pio_next) {
|
|
zio_link_t *remove_zl = zl;
|
|
pio_next = zio_walk_parents(zio, &zl);
|
|
|
|
if ((pio->io_flags & ZIO_FLAG_GODFATHER) &&
|
|
(zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) {
|
|
zio_remove_child(pio, zio, remove_zl);
|
|
/*
|
|
* This is a rare code path, so we don't
|
|
* bother with "next_to_execute".
|
|
*/
|
|
zio_notify_parent(pio, zio, ZIO_WAIT_DONE,
|
|
NULL);
|
|
}
|
|
}
|
|
|
|
if ((pio = zio_unique_parent(zio)) != NULL) {
|
|
/*
|
|
* We're not a root i/o, so there's nothing to do
|
|
* but notify our parent. Don't propagate errors
|
|
* upward since we haven't permanently failed yet.
|
|
*/
|
|
ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER));
|
|
zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE;
|
|
/*
|
|
* This is a rare code path, so we don't bother with
|
|
* "next_to_execute".
|
|
*/
|
|
zio_notify_parent(pio, zio, ZIO_WAIT_DONE, NULL);
|
|
} else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) {
|
|
/*
|
|
* We'd fail again if we reexecuted now, so suspend
|
|
* until conditions improve (e.g. device comes online).
|
|
*/
|
|
zio_suspend(zio->io_spa, zio, ZIO_SUSPEND_IOERR);
|
|
} else {
|
|
/*
|
|
* Reexecution is potentially a huge amount of work.
|
|
* Hand it off to the otherwise-unused claim taskq.
|
|
*/
|
|
ASSERT(taskq_empty_ent(&zio->io_tqent));
|
|
spa_taskq_dispatch_ent(zio->io_spa,
|
|
ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE,
|
|
(task_func_t *)zio_reexecute, zio, 0,
|
|
&zio->io_tqent);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
ASSERT(zio->io_child_count == 0);
|
|
ASSERT(zio->io_reexecute == 0);
|
|
ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL));
|
|
|
|
/*
|
|
* Report any checksum errors, since the I/O is complete.
|
|
*/
|
|
while (zio->io_cksum_report != NULL) {
|
|
zio_cksum_report_t *zcr = zio->io_cksum_report;
|
|
zio->io_cksum_report = zcr->zcr_next;
|
|
zcr->zcr_next = NULL;
|
|
zcr->zcr_finish(zcr, NULL);
|
|
zfs_ereport_free_checksum(zcr);
|
|
}
|
|
|
|
if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp &&
|
|
!BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) &&
|
|
!(zio->io_flags & ZIO_FLAG_NOPWRITE)) {
|
|
metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp);
|
|
}
|
|
|
|
/*
|
|
* It is the responsibility of the done callback to ensure that this
|
|
* particular zio is no longer discoverable for adoption, and as
|
|
* such, cannot acquire any new parents.
|
|
*/
|
|
if (zio->io_done)
|
|
zio->io_done(zio);
|
|
|
|
mutex_enter(&zio->io_lock);
|
|
zio->io_state[ZIO_WAIT_DONE] = 1;
|
|
mutex_exit(&zio->io_lock);
|
|
|
|
/*
|
|
* We are done executing this zio. We may want to execute a parent
|
|
* next. See the comment in zio_notify_parent().
|
|
*/
|
|
zio_t *next_to_execute = NULL;
|
|
zl = NULL;
|
|
for (pio = zio_walk_parents(zio, &zl); pio != NULL; pio = pio_next) {
|
|
zio_link_t *remove_zl = zl;
|
|
pio_next = zio_walk_parents(zio, &zl);
|
|
zio_remove_child(pio, zio, remove_zl);
|
|
zio_notify_parent(pio, zio, ZIO_WAIT_DONE, &next_to_execute);
|
|
}
|
|
|
|
if (zio->io_waiter != NULL) {
|
|
mutex_enter(&zio->io_lock);
|
|
zio->io_executor = NULL;
|
|
cv_broadcast(&zio->io_cv);
|
|
mutex_exit(&zio->io_lock);
|
|
} else {
|
|
zio_destroy(zio);
|
|
}
|
|
|
|
return (next_to_execute);
|
|
}
|
|
|
|
/*
|
|
* ==========================================================================
|
|
* I/O pipeline definition
|
|
* ==========================================================================
|
|
*/
|
|
static zio_pipe_stage_t *zio_pipeline[] = {
|
|
NULL,
|
|
zio_read_bp_init,
|
|
zio_write_bp_init,
|
|
zio_free_bp_init,
|
|
zio_issue_async,
|
|
zio_write_compress,
|
|
zio_encrypt,
|
|
zio_checksum_generate,
|
|
zio_nop_write,
|
|
zio_ddt_read_start,
|
|
zio_ddt_read_done,
|
|
zio_ddt_write,
|
|
zio_ddt_free,
|
|
zio_gang_assemble,
|
|
zio_gang_issue,
|
|
zio_dva_throttle,
|
|
zio_dva_allocate,
|
|
zio_dva_free,
|
|
zio_dva_claim,
|
|
zio_ready,
|
|
zio_vdev_io_start,
|
|
zio_vdev_io_done,
|
|
zio_vdev_io_assess,
|
|
zio_checksum_verify,
|
|
zio_done
|
|
};
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Compare two zbookmark_phys_t's to see which we would reach first in a
|
|
* pre-order traversal of the object tree.
|
|
*
|
|
* This is simple in every case aside from the meta-dnode object. For all other
|
|
* objects, we traverse them in order (object 1 before object 2, and so on).
|
|
* However, all of these objects are traversed while traversing object 0, since
|
|
* the data it points to is the list of objects. Thus, we need to convert to a
|
|
* canonical representation so we can compare meta-dnode bookmarks to
|
|
* non-meta-dnode bookmarks.
|
|
*
|
|
* We do this by calculating "equivalents" for each field of the zbookmark.
|
|
* zbookmarks outside of the meta-dnode use their own object and level, and
|
|
* calculate the level 0 equivalent (the first L0 blkid that is contained in the
|
|
* blocks this bookmark refers to) by multiplying their blkid by their span
|
|
* (the number of L0 blocks contained within one block at their level).
|
|
* zbookmarks inside the meta-dnode calculate their object equivalent
|
|
* (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use
|
|
* level + 1<<31 (any value larger than a level could ever be) for their level.
|
|
* This causes them to always compare before a bookmark in their object
|
|
* equivalent, compare appropriately to bookmarks in other objects, and to
|
|
* compare appropriately to other bookmarks in the meta-dnode.
|
|
*/
|
|
int
|
|
zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2,
|
|
const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2)
|
|
{
|
|
/*
|
|
* These variables represent the "equivalent" values for the zbookmark,
|
|
* after converting zbookmarks inside the meta dnode to their
|
|
* normal-object equivalents.
|
|
*/
|
|
uint64_t zb1obj, zb2obj;
|
|
uint64_t zb1L0, zb2L0;
|
|
uint64_t zb1level, zb2level;
|
|
|
|
if (zb1->zb_object == zb2->zb_object &&
|
|
zb1->zb_level == zb2->zb_level &&
|
|
zb1->zb_blkid == zb2->zb_blkid)
|
|
return (0);
|
|
|
|
IMPLY(zb1->zb_level > 0, ibs1 >= SPA_MINBLOCKSHIFT);
|
|
IMPLY(zb2->zb_level > 0, ibs2 >= SPA_MINBLOCKSHIFT);
|
|
|
|
/*
|
|
* BP_SPANB calculates the span in blocks.
|
|
*/
|
|
zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level);
|
|
zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level);
|
|
|
|
if (zb1->zb_object == DMU_META_DNODE_OBJECT) {
|
|
zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
|
|
zb1L0 = 0;
|
|
zb1level = zb1->zb_level + COMPARE_META_LEVEL;
|
|
} else {
|
|
zb1obj = zb1->zb_object;
|
|
zb1level = zb1->zb_level;
|
|
}
|
|
|
|
if (zb2->zb_object == DMU_META_DNODE_OBJECT) {
|
|
zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
|
|
zb2L0 = 0;
|
|
zb2level = zb2->zb_level + COMPARE_META_LEVEL;
|
|
} else {
|
|
zb2obj = zb2->zb_object;
|
|
zb2level = zb2->zb_level;
|
|
}
|
|
|
|
/* Now that we have a canonical representation, do the comparison. */
|
|
if (zb1obj != zb2obj)
|
|
return (zb1obj < zb2obj ? -1 : 1);
|
|
else if (zb1L0 != zb2L0)
|
|
return (zb1L0 < zb2L0 ? -1 : 1);
|
|
else if (zb1level != zb2level)
|
|
return (zb1level > zb2level ? -1 : 1);
|
|
/*
|
|
* This can (theoretically) happen if the bookmarks have the same object
|
|
* and level, but different blkids, if the block sizes are not the same.
|
|
* There is presently no way to change the indirect block sizes
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This function checks the following: given that last_block is the place that
|
|
* our traversal stopped last time, does that guarantee that we've visited
|
|
* every node under subtree_root? Therefore, we can't just use the raw output
|
|
* of zbookmark_compare. We have to pass in a modified version of
|
|
* subtree_root; by incrementing the block id, and then checking whether
|
|
* last_block is before or equal to that, we can tell whether or not having
|
|
* visited last_block implies that all of subtree_root's children have been
|
|
* visited.
|
|
*/
|
|
boolean_t
|
|
zbookmark_subtree_completed(const dnode_phys_t *dnp,
|
|
const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block)
|
|
{
|
|
zbookmark_phys_t mod_zb = *subtree_root;
|
|
mod_zb.zb_blkid++;
|
|
ASSERT(last_block->zb_level == 0);
|
|
|
|
/* The objset_phys_t isn't before anything. */
|
|
if (dnp == NULL)
|
|
return (B_FALSE);
|
|
|
|
/*
|
|
* We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the
|
|
* data block size in sectors, because that variable is only used if
|
|
* the bookmark refers to a block in the meta-dnode. Since we don't
|
|
* know without examining it what object it refers to, and there's no
|
|
* harm in passing in this value in other cases, we always pass it in.
|
|
*
|
|
* We pass in 0 for the indirect block size shift because zb2 must be
|
|
* level 0. The indirect block size is only used to calculate the span
|
|
* of the bookmark, but since the bookmark must be level 0, the span is
|
|
* always 1, so the math works out.
|
|
*
|
|
* If you make changes to how the zbookmark_compare code works, be sure
|
|
* to make sure that this code still works afterwards.
|
|
*/
|
|
return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift,
|
|
1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb,
|
|
last_block) <= 0);
|
|
}
|
|
|
|
EXPORT_SYMBOL(zio_type_name);
|
|
EXPORT_SYMBOL(zio_buf_alloc);
|
|
EXPORT_SYMBOL(zio_data_buf_alloc);
|
|
EXPORT_SYMBOL(zio_buf_free);
|
|
EXPORT_SYMBOL(zio_data_buf_free);
|
|
|
|
/* BEGIN CSTYLED */
|
|
ZFS_MODULE_PARAM(zfs_zio, zio_, slow_io_ms, INT, ZMOD_RW,
|
|
"Max I/O completion time (milliseconds) before marking it as slow");
|
|
|
|
ZFS_MODULE_PARAM(zfs_zio, zio_, requeue_io_start_cut_in_line, INT, ZMOD_RW,
|
|
"Prioritize requeued I/O");
|
|
|
|
ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_deferred_free, INT, ZMOD_RW,
|
|
"Defer frees starting in this pass");
|
|
|
|
ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_dont_compress, INT, ZMOD_RW,
|
|
"Don't compress starting in this pass");
|
|
|
|
ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_rewrite, INT, ZMOD_RW,
|
|
"Rewrite new bps starting in this pass");
|
|
|
|
ZFS_MODULE_PARAM(zfs_zio, zio_, dva_throttle_enabled, INT, ZMOD_RW,
|
|
"Throttle block allocations in the ZIO pipeline");
|
|
|
|
ZFS_MODULE_PARAM(zfs_zio, zio_, deadman_log_all, INT, ZMOD_RW,
|
|
"Log all slow ZIOs, not just those with vdevs");
|
|
/* END CSTYLED */
|