0ea05c64f8
Currently, there is no way to pause a scrub. Pausing may be useful when the pool is busy with other I/O to preserve bandwidth. This patch adds the ability to pause and resume scrubbing. This is achieved by maintaining a persistent on-disk scrub state. While the state is 'paused' we do not scrub any more blocks. We do however perform regular scan housekeeping such as freeing async destroyed and deadlist blocks while paused. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Thomas Caputi <tcaputi@datto.com> Reviewed-by: Serapheim Dimitropoulos <serapheimd@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alek Pinchuk <apinchuk@datto.com> Closes #6167
151 lines
5.1 KiB
C
151 lines
5.1 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) 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
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* Copyright (c) 2017 Datto Inc.
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*/
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#ifndef _SYS_DSL_SCAN_H
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#define _SYS_DSL_SCAN_H
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#include <sys/zfs_context.h>
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#include <sys/zio.h>
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#include <sys/ddt.h>
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#include <sys/bplist.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct objset;
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struct dsl_dir;
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struct dsl_dataset;
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struct dsl_pool;
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struct dmu_tx;
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/*
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* All members of this structure must be uint64_t, for byteswap
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* purposes.
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*/
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typedef struct dsl_scan_phys {
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uint64_t scn_func; /* pool_scan_func_t */
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uint64_t scn_state; /* dsl_scan_state_t */
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uint64_t scn_queue_obj;
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uint64_t scn_min_txg;
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uint64_t scn_max_txg;
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uint64_t scn_cur_min_txg;
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uint64_t scn_cur_max_txg;
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uint64_t scn_start_time;
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uint64_t scn_end_time;
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uint64_t scn_to_examine; /* total bytes to be scanned */
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uint64_t scn_examined; /* bytes scanned so far */
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uint64_t scn_to_process;
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uint64_t scn_processed;
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uint64_t scn_errors; /* scan I/O error count */
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uint64_t scn_ddt_class_max;
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ddt_bookmark_t scn_ddt_bookmark;
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zbookmark_phys_t scn_bookmark;
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uint64_t scn_flags; /* dsl_scan_flags_t */
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} dsl_scan_phys_t;
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#define SCAN_PHYS_NUMINTS (sizeof (dsl_scan_phys_t) / sizeof (uint64_t))
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typedef enum dsl_scan_flags {
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DSF_VISIT_DS_AGAIN = 1<<0,
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DSF_SCRUB_PAUSED = 1<<1,
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} dsl_scan_flags_t;
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#define DSL_SCAN_FLAGS_MASK (DSF_VISIT_DS_AGAIN)
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/*
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* Every pool will have one dsl_scan_t and this structure will contain
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* in-memory information about the scan and a pointer to the on-disk
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* representation (i.e. dsl_scan_phys_t). Most of the state of the scan
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* is contained on-disk to allow the scan to resume in the event of a reboot
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* or panic. This structure maintains information about the behavior of a
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* running scan, some caching information, and how it should traverse the pool.
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*
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* The following members of this structure direct the behavior of the scan:
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*
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* scn_suspending - a scan that cannot be completed in a single txg or
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* has exceeded its allotted time will need to suspend.
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* When this flag is set the scanner will stop traversing
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* the pool and write out the current state to disk.
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*
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* scn_restart_txg - directs the scanner to either restart or start a
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* a scan at the specified txg value.
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*
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* scn_done_txg - when a scan completes its traversal it will set
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* the completion txg to the next txg. This is necessary
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* to ensure that any blocks that were freed during
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* the scan but have not yet been processed (i.e deferred
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* frees) are accounted for.
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*
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* This structure also maintains information about deferred frees which are
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* a special kind of traversal. Deferred free can exist in either a bptree or
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* a bpobj structure. The scn_is_bptree flag will indicate the type of
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* deferred free that is in progress. If the deferred free is part of an
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* asynchronous destroy then the scn_async_destroying flag will be set.
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*/
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typedef struct dsl_scan {
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struct dsl_pool *scn_dp;
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boolean_t scn_suspending;
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uint64_t scn_restart_txg;
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uint64_t scn_done_txg;
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uint64_t scn_sync_start_time;
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zio_t *scn_zio_root;
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/* for freeing blocks */
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boolean_t scn_is_bptree;
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boolean_t scn_async_destroying;
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boolean_t scn_async_stalled;
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uint64_t scn_visited_this_txg;
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dsl_scan_phys_t scn_phys;
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} dsl_scan_t;
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int dsl_scan_init(struct dsl_pool *dp, uint64_t txg);
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void dsl_scan_fini(struct dsl_pool *dp);
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void dsl_scan_sync(struct dsl_pool *, dmu_tx_t *);
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int dsl_scan_cancel(struct dsl_pool *);
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int dsl_scan(struct dsl_pool *, pool_scan_func_t);
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boolean_t dsl_scan_scrubbing(const struct dsl_pool *dp);
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int dsl_scrub_set_pause_resume(const struct dsl_pool *dp, pool_scrub_cmd_t cmd);
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void dsl_resilver_restart(struct dsl_pool *, uint64_t txg);
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boolean_t dsl_scan_resilvering(struct dsl_pool *dp);
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boolean_t dsl_dataset_unstable(struct dsl_dataset *ds);
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void dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum,
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ddt_entry_t *dde, dmu_tx_t *tx);
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void dsl_scan_ds_destroyed(struct dsl_dataset *ds, struct dmu_tx *tx);
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void dsl_scan_ds_snapshotted(struct dsl_dataset *ds, struct dmu_tx *tx);
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void dsl_scan_ds_clone_swapped(struct dsl_dataset *ds1, struct dsl_dataset *ds2,
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struct dmu_tx *tx);
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boolean_t dsl_scan_active(dsl_scan_t *scn);
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boolean_t dsl_scan_is_paused_scrub(const dsl_scan_t *scn);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DSL_SCAN_H */
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