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
94 lines
3.3 KiB
C
94 lines
3.3 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) 2016, 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_UBERBLOCK_IMPL_H
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#define _SYS_UBERBLOCK_IMPL_H
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#include <sys/uberblock.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The uberblock version is incremented whenever an incompatible on-disk
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* format change is made to the SPA, DMU, or ZAP.
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*
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* Note: the first two fields should never be moved. When a storage pool
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* is opened, the uberblock must be read off the disk before the version
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* can be checked. If the ub_version field is moved, we may not detect
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* version mismatch. If the ub_magic field is moved, applications that
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* expect the magic number in the first word won't work.
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*/
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#define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
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#define UBERBLOCK_SHIFT 10 /* up to 1K */
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#define MMP_MAGIC 0xa11cea11 /* all-see-all */
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struct uberblock {
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uint64_t ub_magic; /* UBERBLOCK_MAGIC */
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uint64_t ub_version; /* SPA_VERSION */
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uint64_t ub_txg; /* txg of last sync */
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uint64_t ub_guid_sum; /* sum of all vdev guids */
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uint64_t ub_timestamp; /* UTC time of last sync */
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blkptr_t ub_rootbp; /* MOS objset_phys_t */
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/* highest SPA_VERSION supported by software that wrote this txg */
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uint64_t ub_software_version;
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/* Maybe missing in uberblocks we read, but always written */
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uint64_t ub_mmp_magic; /* MMP_MAGIC */
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uint64_t ub_mmp_delay; /* nanosec since last MMP write */
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uint64_t ub_mmp_seq; /* reserved for sequence number */
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/*
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* ub_checkpoint_txg indicates two things about the current uberblock:
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*
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* 1] If it is not zero then this uberblock is a checkpoint. If it is
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* zero, then this uberblock is not a checkpoint.
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*
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* 2] On checkpointed uberblocks, the value of ub_checkpoint_txg is
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* the ub_txg that the uberblock had at the time we moved it to
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* the MOS config.
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*
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* The field is set when we checkpoint the uberblock and continues to
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* hold that value even after we've rewound (unlike the ub_txg that
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* is reset to a higher value).
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*
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* Besides checks used to determine whether we are reopening the
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* pool from a checkpointed uberblock [see spa_ld_select_uberblock()],
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* the value of the field is used to determine which ZIL blocks have
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* been allocated according to the ms_sm when we are rewinding to a
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* checkpoint. Specifically, if blk_birth > ub_checkpoint_txg, then
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* the ZIL block is not allocated [see uses of spa_min_claim_txg()].
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*/
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uint64_t ub_checkpoint_txg;
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_UBERBLOCK_IMPL_H */
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