d2734cce68
Details about the motivation of this feature and its usage can be found in this blogpost: https://sdimitro.github.io/post/zpool-checkpoint/ A lightning talk of this feature can be found here: https://www.youtube.com/watch?v=fPQA8K40jAM Implementation details can be found in big block comment of spa_checkpoint.c Side-changes that are relevant to this commit but not explained elsewhere: * renames members of "struct metaslab trees to be shorter without losing meaning * space_map_{alloc,truncate}() accept a block size as a parameter. The reason is that in the current state all space maps that we allocate through the DMU use a global tunable (space_map_blksz) which defauls to 4KB. This is ok for metaslab space maps in terms of bandwirdth since they are scattered all over the disk. But for other space maps this default is probably not what we want. Examples are device removal's vdev_obsolete_sm or vdev_chedkpoint_sm from this review. Both of these have a 1:1 relationship with each vdev and could benefit from a bigger block size. Porting notes: * The part of dsl_scan_sync() which handles async destroys has been moved into the new dsl_process_async_destroys() function. * Remove "VERIFY(!(flags & FWRITE))" in "kernel.c" so zhack can write to block device backed pools. * ZTS: * Fix get_txg() in zpool_sync_001_pos due to "checkpoint_txg". * Don't use large dd block sizes on /dev/urandom under Linux in checkpoint_capacity. * Adopt Delphix-OS's setting of 4 (spa_asize_inflation = SPA_DVAS_PER_BP + 1) for the checkpoint_capacity test to speed its attempts to fill the pool * Create the base and nested pools with sync=disabled to speed up the "setup" phase. * Clear labels in test pool between checkpoint tests to avoid duplicate pool issues. * The import_rewind_device_replaced test has been marked as "known to fail" for the reasons listed in its DISCLAIMER. * New module parameters: zfs_spa_discard_memory_limit, zfs_remove_max_bytes_pause (not documented - debugging only) vdev_max_ms_count (formerly metaslabs_per_vdev) vdev_min_ms_count Authored by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: John Kennedy <john.kennedy@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Approved by: Richard Lowe <richlowe@richlowe.net> Ported-by: Tim Chase <tim@chase2k.com> Signed-off-by: Tim Chase <tim@chase2k.com> OpenZFS-issue: https://illumos.org/issues/9166 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/7159fdb8 Closes #7570
784 lines
22 KiB
C
784 lines
22 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) 2012, 2018 by Delphix. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/dmu_objset.h>
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#include <sys/dmu_traverse.h>
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#include <sys/dsl_dataset.h>
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#include <sys/dsl_dir.h>
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#include <sys/dsl_pool.h>
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#include <sys/dnode.h>
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#include <sys/spa.h>
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#include <sys/spa_impl.h>
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#include <sys/zio.h>
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#include <sys/dmu_impl.h>
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#include <sys/sa.h>
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#include <sys/sa_impl.h>
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#include <sys/callb.h>
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#include <sys/zfeature.h>
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int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
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int32_t send_holes_without_birth_time = 1;
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typedef struct prefetch_data {
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kmutex_t pd_mtx;
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kcondvar_t pd_cv;
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int32_t pd_bytes_fetched;
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int pd_flags;
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boolean_t pd_cancel;
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boolean_t pd_exited;
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zbookmark_phys_t pd_resume;
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} prefetch_data_t;
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typedef struct traverse_data {
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spa_t *td_spa;
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uint64_t td_objset;
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blkptr_t *td_rootbp;
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uint64_t td_min_txg;
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zbookmark_phys_t *td_resume;
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int td_flags;
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prefetch_data_t *td_pfd;
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boolean_t td_paused;
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uint64_t td_hole_birth_enabled_txg;
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blkptr_cb_t *td_func;
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void *td_arg;
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boolean_t td_realloc_possible;
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} traverse_data_t;
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static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
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uint64_t objset, uint64_t object);
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static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *,
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uint64_t objset, uint64_t object);
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static int
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traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
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{
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traverse_data_t *td = arg;
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zbookmark_phys_t zb;
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if (BP_IS_HOLE(bp))
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return (0);
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if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa))
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return (-1);
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SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
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bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
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(void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg);
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return (0);
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}
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static int
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traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
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{
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traverse_data_t *td = arg;
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if (lrc->lrc_txtype == TX_WRITE) {
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lr_write_t *lr = (lr_write_t *)lrc;
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blkptr_t *bp = &lr->lr_blkptr;
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zbookmark_phys_t zb;
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|
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if (BP_IS_HOLE(bp))
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return (0);
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|
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if (claim_txg == 0 || bp->blk_birth < claim_txg)
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return (0);
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SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid,
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ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
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(void) td->td_func(td->td_spa, zilog, bp, &zb, NULL,
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td->td_arg);
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}
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return (0);
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|
}
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|
|
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static void
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traverse_zil(traverse_data_t *td, zil_header_t *zh)
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|
{
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uint64_t claim_txg = zh->zh_claim_txg;
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|
|
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/*
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* We only want to visit blocks that have been claimed but not yet
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* replayed; plus blocks that are already stable in read-only mode.
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*/
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if (claim_txg == 0 && spa_writeable(td->td_spa))
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return;
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zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh);
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(void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td,
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claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT));
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zil_free(zilog);
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|
}
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typedef enum resume_skip {
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RESUME_SKIP_ALL,
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RESUME_SKIP_NONE,
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RESUME_SKIP_CHILDREN
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} resume_skip_t;
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/*
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* Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
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* the block indicated by zb does not need to be visited at all. Returns
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* RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
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* resume point. This indicates that this block should be visited but not its
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* children (since they must have been visited in a previous traversal).
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* Otherwise returns RESUME_SKIP_NONE.
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*/
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static resume_skip_t
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resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp,
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const zbookmark_phys_t *zb)
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{
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if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) {
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/*
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* If we already visited this bp & everything below,
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* don't bother doing it again.
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*/
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if (zbookmark_subtree_completed(dnp, zb, td->td_resume))
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return (RESUME_SKIP_ALL);
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/*
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* If we found the block we're trying to resume from, zero
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* the bookmark out to indicate that we have resumed.
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*/
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if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) {
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bzero(td->td_resume, sizeof (*zb));
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if (td->td_flags & TRAVERSE_POST)
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return (RESUME_SKIP_CHILDREN);
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}
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}
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return (RESUME_SKIP_NONE);
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}
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static void
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traverse_prefetch_metadata(traverse_data_t *td,
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const blkptr_t *bp, const zbookmark_phys_t *zb)
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{
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arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
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int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
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if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA))
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return;
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/*
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* If we are in the process of resuming, don't prefetch, because
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* some children will not be needed (and in fact may have already
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* been freed).
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*/
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if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume))
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return;
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if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg)
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return;
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if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)
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return;
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if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
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zio_flags |= ZIO_FLAG_RAW;
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(void) arc_read(NULL, td->td_spa, bp, NULL, NULL,
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ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
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}
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static boolean_t
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prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
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{
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ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
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if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
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BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
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return (B_FALSE);
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return (B_TRUE);
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}
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static int
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traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
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const blkptr_t *bp, const zbookmark_phys_t *zb)
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{
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int err = 0;
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arc_buf_t *buf = NULL;
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prefetch_data_t *pd = td->td_pfd;
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|
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switch (resume_skip_check(td, dnp, zb)) {
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case RESUME_SKIP_ALL:
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return (0);
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|
case RESUME_SKIP_CHILDREN:
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goto post;
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case RESUME_SKIP_NONE:
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break;
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default:
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ASSERT(0);
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}
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|
|
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if (bp->blk_birth == 0) {
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/*
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* Since this block has a birth time of 0 it must be one of
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* two things: a hole created before the
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* SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
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|
* which has always been a hole in an object.
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|
*
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* If a file is written sparsely, then the unwritten parts of
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* the file were "always holes" -- that is, they have been
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|
* holes since this object was allocated. However, we (and
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|
* our callers) can not necessarily tell when an object was
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|
* allocated. Therefore, if it's possible that this object
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|
* was freed and then its object number reused, we need to
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* visit all the holes with birth==0.
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|
*
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* If it isn't possible that the object number was reused,
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* then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
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* all the blocks we will visit as part of this traversal,
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* then this hole must have always existed, so we can skip
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* it. We visit blocks born after (exclusive) td_min_txg.
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*
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* Note that the meta-dnode cannot be reallocated.
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*/
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|
if (!send_holes_without_birth_time &&
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(!td->td_realloc_possible ||
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zb->zb_object == DMU_META_DNODE_OBJECT) &&
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td->td_hole_birth_enabled_txg <= td->td_min_txg)
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|
return (0);
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|
} else if (bp->blk_birth <= td->td_min_txg) {
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|
return (0);
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|
}
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|
|
|
if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
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|
uint64_t size = BP_GET_LSIZE(bp);
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mutex_enter(&pd->pd_mtx);
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|
ASSERT(pd->pd_bytes_fetched >= 0);
|
|
while (pd->pd_bytes_fetched < size && !pd->pd_exited)
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|
cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
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|
pd->pd_bytes_fetched -= size;
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|
cv_broadcast(&pd->pd_cv);
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|
mutex_exit(&pd->pd_mtx);
|
|
}
|
|
|
|
if (BP_IS_HOLE(bp)) {
|
|
err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
|
|
if (err != 0)
|
|
goto post;
|
|
return (0);
|
|
}
|
|
|
|
if (td->td_flags & TRAVERSE_PRE) {
|
|
err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
|
|
td->td_arg);
|
|
if (err == TRAVERSE_VISIT_NO_CHILDREN)
|
|
return (0);
|
|
if (err != 0)
|
|
goto post;
|
|
}
|
|
|
|
if (BP_GET_LEVEL(bp) > 0) {
|
|
uint32_t flags = ARC_FLAG_WAIT;
|
|
int32_t i;
|
|
int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
|
|
zbookmark_phys_t *czb;
|
|
|
|
ASSERT(!BP_IS_PROTECTED(bp));
|
|
|
|
err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
|
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ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
|
|
if (err != 0)
|
|
goto post;
|
|
|
|
czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
|
|
|
|
for (i = 0; i < epb; i++) {
|
|
SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
|
|
zb->zb_level - 1,
|
|
zb->zb_blkid * epb + i);
|
|
traverse_prefetch_metadata(td,
|
|
&((blkptr_t *)buf->b_data)[i], czb);
|
|
}
|
|
|
|
/* recursively visitbp() blocks below this */
|
|
for (i = 0; i < epb; i++) {
|
|
SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
|
|
zb->zb_level - 1,
|
|
zb->zb_blkid * epb + i);
|
|
err = traverse_visitbp(td, dnp,
|
|
&((blkptr_t *)buf->b_data)[i], czb);
|
|
if (err != 0)
|
|
break;
|
|
}
|
|
|
|
kmem_free(czb, sizeof (zbookmark_phys_t));
|
|
|
|
} else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
|
|
uint32_t flags = ARC_FLAG_WAIT;
|
|
uint32_t zio_flags = ZIO_FLAG_CANFAIL;
|
|
int32_t i;
|
|
int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
|
|
dnode_phys_t *child_dnp;
|
|
|
|
/*
|
|
* dnode blocks might have their bonus buffers encrypted, so
|
|
* we must be careful to honor TRAVERSE_NO_DECRYPT
|
|
*/
|
|
if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
|
|
err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
|
|
ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
|
|
if (err != 0)
|
|
goto post;
|
|
|
|
child_dnp = buf->b_data;
|
|
|
|
for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
|
|
prefetch_dnode_metadata(td, &child_dnp[i],
|
|
zb->zb_objset, zb->zb_blkid * epb + i);
|
|
}
|
|
|
|
/* recursively visitbp() blocks below this */
|
|
for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
|
|
err = traverse_dnode(td, &child_dnp[i],
|
|
zb->zb_objset, zb->zb_blkid * epb + i);
|
|
if (err != 0)
|
|
break;
|
|
}
|
|
} else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
|
|
uint32_t zio_flags = ZIO_FLAG_CANFAIL;
|
|
arc_flags_t flags = ARC_FLAG_WAIT;
|
|
objset_phys_t *osp;
|
|
|
|
if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
|
|
err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
|
|
ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
|
|
if (err != 0)
|
|
goto post;
|
|
|
|
osp = buf->b_data;
|
|
prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset,
|
|
DMU_META_DNODE_OBJECT);
|
|
/*
|
|
* See the block comment above for the goal of this variable.
|
|
* If the maxblkid of the meta-dnode is 0, then we know that
|
|
* we've never had more than DNODES_PER_BLOCK objects in the
|
|
* dataset, which means we can't have reused any object ids.
|
|
*/
|
|
if (osp->os_meta_dnode.dn_maxblkid == 0)
|
|
td->td_realloc_possible = B_FALSE;
|
|
|
|
if (OBJSET_BUF_HAS_USERUSED(buf)) {
|
|
if (OBJSET_BUF_HAS_PROJECTUSED(buf))
|
|
prefetch_dnode_metadata(td,
|
|
&osp->os_projectused_dnode,
|
|
zb->zb_objset, DMU_PROJECTUSED_OBJECT);
|
|
prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
|
|
zb->zb_objset, DMU_GROUPUSED_OBJECT);
|
|
prefetch_dnode_metadata(td, &osp->os_userused_dnode,
|
|
zb->zb_objset, DMU_USERUSED_OBJECT);
|
|
}
|
|
|
|
err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset,
|
|
DMU_META_DNODE_OBJECT);
|
|
if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) {
|
|
if (OBJSET_BUF_HAS_PROJECTUSED(buf))
|
|
err = traverse_dnode(td,
|
|
&osp->os_projectused_dnode, zb->zb_objset,
|
|
DMU_PROJECTUSED_OBJECT);
|
|
if (err == 0)
|
|
err = traverse_dnode(td,
|
|
&osp->os_groupused_dnode, zb->zb_objset,
|
|
DMU_GROUPUSED_OBJECT);
|
|
if (err == 0)
|
|
err = traverse_dnode(td,
|
|
&osp->os_userused_dnode, zb->zb_objset,
|
|
DMU_USERUSED_OBJECT);
|
|
}
|
|
}
|
|
|
|
if (buf)
|
|
arc_buf_destroy(buf, &buf);
|
|
|
|
post:
|
|
if (err == 0 && (td->td_flags & TRAVERSE_POST))
|
|
err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
|
|
|
|
if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) {
|
|
/*
|
|
* Ignore this disk error as requested by the HARD flag,
|
|
* and continue traversal.
|
|
*/
|
|
err = 0;
|
|
}
|
|
|
|
/*
|
|
* If we are stopping here, set td_resume.
|
|
*/
|
|
if (td->td_resume != NULL && err != 0 && !td->td_paused) {
|
|
td->td_resume->zb_objset = zb->zb_objset;
|
|
td->td_resume->zb_object = zb->zb_object;
|
|
td->td_resume->zb_level = 0;
|
|
/*
|
|
* If we have stopped on an indirect block (e.g. due to
|
|
* i/o error), we have not visited anything below it.
|
|
* Set the bookmark to the first level-0 block that we need
|
|
* to visit. This way, the resuming code does not need to
|
|
* deal with resuming from indirect blocks.
|
|
*
|
|
* Note, if zb_level <= 0, dnp may be NULL, so we don't want
|
|
* to dereference it.
|
|
*/
|
|
td->td_resume->zb_blkid = zb->zb_blkid;
|
|
if (zb->zb_level > 0) {
|
|
td->td_resume->zb_blkid <<= zb->zb_level *
|
|
(dnp->dn_indblkshift - SPA_BLKPTRSHIFT);
|
|
}
|
|
td->td_paused = B_TRUE;
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
|
|
uint64_t objset, uint64_t object)
|
|
{
|
|
int j;
|
|
zbookmark_phys_t czb;
|
|
|
|
for (j = 0; j < dnp->dn_nblkptr; j++) {
|
|
SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
|
|
traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb);
|
|
}
|
|
|
|
if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
|
|
SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
|
|
traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb);
|
|
}
|
|
}
|
|
|
|
static int
|
|
traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
|
|
uint64_t objset, uint64_t object)
|
|
{
|
|
int j, err = 0;
|
|
zbookmark_phys_t czb;
|
|
|
|
if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL &&
|
|
object < td->td_resume->zb_object)
|
|
return (0);
|
|
|
|
if (td->td_flags & TRAVERSE_PRE) {
|
|
SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
|
|
ZB_DNODE_BLKID);
|
|
err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
|
|
td->td_arg);
|
|
if (err == TRAVERSE_VISIT_NO_CHILDREN)
|
|
return (0);
|
|
if (err != 0)
|
|
return (err);
|
|
}
|
|
|
|
for (j = 0; j < dnp->dn_nblkptr; j++) {
|
|
SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
|
|
err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
|
|
if (err != 0)
|
|
break;
|
|
}
|
|
|
|
if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
|
|
SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
|
|
err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
|
|
}
|
|
|
|
if (err == 0 && (td->td_flags & TRAVERSE_POST)) {
|
|
SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
|
|
ZB_DNODE_BLKID);
|
|
err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
|
|
td->td_arg);
|
|
if (err == TRAVERSE_VISIT_NO_CHILDREN)
|
|
return (0);
|
|
if (err != 0)
|
|
return (err);
|
|
}
|
|
return (err);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
|
|
const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
|
|
{
|
|
prefetch_data_t *pfd = arg;
|
|
int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
|
|
arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
|
|
ARC_FLAG_PRESCIENT_PREFETCH;
|
|
|
|
ASSERT(pfd->pd_bytes_fetched >= 0);
|
|
if (bp == NULL)
|
|
return (0);
|
|
if (pfd->pd_cancel)
|
|
return (SET_ERROR(EINTR));
|
|
|
|
if (!prefetch_needed(pfd, bp))
|
|
return (0);
|
|
|
|
mutex_enter(&pfd->pd_mtx);
|
|
while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max)
|
|
cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx);
|
|
pfd->pd_bytes_fetched += BP_GET_LSIZE(bp);
|
|
cv_broadcast(&pfd->pd_cv);
|
|
mutex_exit(&pfd->pd_mtx);
|
|
|
|
if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
|
|
(void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
|
|
zio_flags, &aflags, zb);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
traverse_prefetch_thread(void *arg)
|
|
{
|
|
traverse_data_t *td_main = arg;
|
|
traverse_data_t td = *td_main;
|
|
zbookmark_phys_t czb;
|
|
fstrans_cookie_t cookie = spl_fstrans_mark();
|
|
|
|
td.td_func = traverse_prefetcher;
|
|
td.td_arg = td_main->td_pfd;
|
|
td.td_pfd = NULL;
|
|
td.td_resume = &td_main->td_pfd->pd_resume;
|
|
|
|
SET_BOOKMARK(&czb, td.td_objset,
|
|
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
|
|
(void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb);
|
|
|
|
mutex_enter(&td_main->td_pfd->pd_mtx);
|
|
td_main->td_pfd->pd_exited = B_TRUE;
|
|
cv_broadcast(&td_main->td_pfd->pd_cv);
|
|
mutex_exit(&td_main->td_pfd->pd_mtx);
|
|
spl_fstrans_unmark(cookie);
|
|
}
|
|
|
|
/*
|
|
* NB: dataset must not be changing on-disk (eg, is a snapshot or we are
|
|
* in syncing context).
|
|
*/
|
|
static int
|
|
traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
|
|
uint64_t txg_start, zbookmark_phys_t *resume, int flags,
|
|
blkptr_cb_t func, void *arg)
|
|
{
|
|
traverse_data_t *td;
|
|
prefetch_data_t *pd;
|
|
zbookmark_phys_t *czb;
|
|
int err;
|
|
|
|
ASSERT(ds == NULL || objset == ds->ds_object);
|
|
ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
|
|
|
|
td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP);
|
|
pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP);
|
|
czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
|
|
|
|
td->td_spa = spa;
|
|
td->td_objset = objset;
|
|
td->td_rootbp = rootbp;
|
|
td->td_min_txg = txg_start;
|
|
td->td_resume = resume;
|
|
td->td_func = func;
|
|
td->td_arg = arg;
|
|
td->td_pfd = pd;
|
|
td->td_flags = flags;
|
|
td->td_paused = B_FALSE;
|
|
td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE);
|
|
|
|
if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
|
|
VERIFY(spa_feature_enabled_txg(spa,
|
|
SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg));
|
|
} else {
|
|
td->td_hole_birth_enabled_txg = UINT64_MAX;
|
|
}
|
|
|
|
pd->pd_flags = flags;
|
|
if (resume != NULL)
|
|
pd->pd_resume = *resume;
|
|
mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL);
|
|
|
|
SET_BOOKMARK(czb, td->td_objset,
|
|
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
|
|
|
|
/* See comment on ZIL traversal in dsl_scan_visitds. */
|
|
if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
|
|
enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
|
|
uint32_t flags = ARC_FLAG_WAIT;
|
|
objset_phys_t *osp;
|
|
arc_buf_t *buf;
|
|
|
|
if ((td->td_flags & TRAVERSE_NO_DECRYPT) &&
|
|
BP_IS_PROTECTED(rootbp))
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
|
|
err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func,
|
|
&buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb);
|
|
if (err != 0) {
|
|
/*
|
|
* If both TRAVERSE_HARD and TRAVERSE_PRE are set,
|
|
* continue to visitbp so that td_func can be called
|
|
* in pre stage, and err will reset to zero.
|
|
*/
|
|
if (!(td->td_flags & TRAVERSE_HARD) ||
|
|
!(td->td_flags & TRAVERSE_PRE))
|
|
return (err);
|
|
} else {
|
|
osp = buf->b_data;
|
|
traverse_zil(td, &osp->os_zil_header);
|
|
arc_buf_destroy(buf, &buf);
|
|
}
|
|
}
|
|
|
|
if (!(flags & TRAVERSE_PREFETCH_DATA) ||
|
|
taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread,
|
|
td, TQ_NOQUEUE) == TASKQID_INVALID)
|
|
pd->pd_exited = B_TRUE;
|
|
|
|
err = traverse_visitbp(td, NULL, rootbp, czb);
|
|
|
|
mutex_enter(&pd->pd_mtx);
|
|
pd->pd_cancel = B_TRUE;
|
|
cv_broadcast(&pd->pd_cv);
|
|
while (!pd->pd_exited)
|
|
cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
|
|
mutex_exit(&pd->pd_mtx);
|
|
|
|
mutex_destroy(&pd->pd_mtx);
|
|
cv_destroy(&pd->pd_cv);
|
|
|
|
kmem_free(czb, sizeof (zbookmark_phys_t));
|
|
kmem_free(pd, sizeof (struct prefetch_data));
|
|
kmem_free(td, sizeof (struct traverse_data));
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* NB: dataset must not be changing on-disk (eg, is a snapshot or we are
|
|
* in syncing context).
|
|
*/
|
|
int
|
|
traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start,
|
|
zbookmark_phys_t *resume,
|
|
int flags, blkptr_cb_t func, void *arg)
|
|
{
|
|
return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
|
|
&dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg));
|
|
}
|
|
|
|
int
|
|
traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start,
|
|
int flags, blkptr_cb_t func, void *arg)
|
|
{
|
|
return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg));
|
|
}
|
|
|
|
int
|
|
traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
|
|
uint64_t txg_start, zbookmark_phys_t *resume, int flags,
|
|
blkptr_cb_t func, void *arg)
|
|
{
|
|
return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
|
|
blkptr, txg_start, resume, flags, func, arg));
|
|
}
|
|
|
|
/*
|
|
* NB: pool must not be changing on-disk (eg, from zdb or sync context).
|
|
*/
|
|
int
|
|
traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
|
|
blkptr_cb_t func, void *arg)
|
|
{
|
|
int err;
|
|
dsl_pool_t *dp = spa_get_dsl(spa);
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
boolean_t hard = (flags & TRAVERSE_HARD);
|
|
|
|
/* visit the MOS */
|
|
err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
|
|
txg_start, NULL, flags, func, arg);
|
|
if (err != 0)
|
|
return (err);
|
|
|
|
/* visit each dataset */
|
|
for (uint64_t obj = 1; err == 0;
|
|
err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) {
|
|
dmu_object_info_t doi;
|
|
|
|
err = dmu_object_info(mos, obj, &doi);
|
|
if (err != 0) {
|
|
if (hard)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
|
|
dsl_dataset_t *ds;
|
|
uint64_t txg = txg_start;
|
|
|
|
dsl_pool_config_enter(dp, FTAG);
|
|
err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
|
|
dsl_pool_config_exit(dp, FTAG);
|
|
if (err != 0) {
|
|
if (hard)
|
|
continue;
|
|
break;
|
|
}
|
|
if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
|
|
txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
|
|
err = traverse_dataset(ds, txg, flags, func, arg);
|
|
dsl_dataset_rele(ds, FTAG);
|
|
if (err != 0)
|
|
break;
|
|
}
|
|
}
|
|
if (err == ESRCH)
|
|
err = 0;
|
|
return (err);
|
|
}
|
|
|
|
#if defined(_KERNEL)
|
|
EXPORT_SYMBOL(traverse_dataset);
|
|
EXPORT_SYMBOL(traverse_pool);
|
|
|
|
module_param(zfs_pd_bytes_max, int, 0644);
|
|
MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
|
|
|
|
module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
|
|
MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time");
|
|
|
|
module_param_named(send_holes_without_birth_time,
|
|
send_holes_without_birth_time, int, 0644);
|
|
MODULE_PARM_DESC(send_holes_without_birth_time,
|
|
"Ignore hole_birth txg for zfs send");
|
|
#endif
|