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Fix ASSERT in dsl_scan_fini() and cleanup comments

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This patch fixes an issue where dsl_scan_prefetch_cb() might
add more prefetch I/Os to the prefetch queue after prefetching
has been completed. This was happening because that code was
checking scn->scn_suspending instead of scn->scn_prefetch_stop.
This occasionally triggered an ASSERT during ztest runs in
dsl_scan_fini() when the code attempted to destroy an AVL tree
that still had entires in it. This patch also includes a number
of spelling corrections and comment cleanups throughout
dsl_scan.c

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7353
This commit is contained in:
Tom Caputi 2018-03-28 21:30:44 -04:00 committed by Brian Behlendorf
parent d2812de6f7
commit 13a2ff2727
1 changed files with 13 additions and 13 deletions
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26
module/zfs/dsl_scan.c
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@ -95,7 +95,7 @@
* needs to be notified whenever a block is freed. This is needed to allow
* the scanning code to remove these I/Os from the issuing queue. Additionally,
* we do not attempt to queue gang blocks to be issued sequentially since this
* is very hard to do and would have an extremely limitted performance benefit.
* is very hard to do and would have an extremely limited performance benefit.
* Instead, we simply issue gang I/Os as soon as we find them using the legacy
* algorithm.
*
@ -304,9 +304,9 @@ scan_init(void)
* This is used in ext_size_compare() to weight segments
* based on how sparse they are. This cannot be changed
* mid-scan and the tree comparison functions don't currently
* have a mechansim for passing additional context to the
* have a mechanism for passing additional context to the
* compare functions. Thus we store this value globally and
* we only allow it to be set at module intiailization time
* we only allow it to be set at module initialization time
*/
fill_weight = zfs_scan_fill_weight;
@ -1438,7 +1438,7 @@ dsl_scan_prefetch_cb(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
dsl_scan_t *scn = spc->spc_scn;
spa_t *spa = scn->scn_dp->dp_spa;
/* broadcast that the IO has completed for rate limitting purposes */
/* broadcast that the IO has completed for rate limiting purposes */
mutex_enter(&spa->spa_scrub_lock);
ASSERT3U(spa->spa_scrub_inflight, >=, BP_GET_PSIZE(bp));
spa->spa_scrub_inflight -= BP_GET_PSIZE(bp);
@ -1446,7 +1446,7 @@ dsl_scan_prefetch_cb(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
mutex_exit(&spa->spa_scrub_lock);
/* if there was an error or we are done prefetching, just cleanup */
if (buf == NULL || scn->scn_suspending)
if (buf == NULL || scn->scn_prefetch_stop)
goto out;
if (BP_GET_LEVEL(bp) > 0) {
@ -2205,7 +2205,7 @@ dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx)
}
/*
* Add descendent datasets to work queue.
* Add descendant datasets to work queue.
*/
if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
scan_ds_queue_insert(scn,
@ -2552,11 +2552,11 @@ scan_io_queue_check_suspend(dsl_scan_t *scn)
}
/*
* Given a list of scan_io_t's in io_list, this issues the io's out to
* Given a list of scan_io_t's in io_list, this issues the I/Os out to
* disk. This consumes the io_list and frees the scan_io_t's. This is
* called when emptying queues, either when we're up against the memory
* limit or when we have finished scanning. Returns B_TRUE if we stopped
* processing the list before we finished. Any zios that were not issued
* processing the list before we finished. Any sios that were not issued
* will remain in the io_list.
*/
static boolean_t
@ -2652,7 +2652,7 @@ scan_io_queue_gather(dsl_scan_io_queue_t *queue, range_seg_t *rs, list_t *list)
/*
* This is called from the queue emptying thread and selects the next
* extent from which we are to issue io's. The behavior of this function
* extent from which we are to issue I/Os. The behavior of this function
* depends on the state of the scan, the current memory consumption and
* whether or not we are performing a scan shutdown.
* 1) We select extents in an elevator algorithm (LBA-order) if the scan
@ -2787,7 +2787,7 @@ scan_io_queues_run_one(void *arg)
* Performs an emptying run on all scan queues in the pool. This just
* punches out one thread per top-level vdev, each of which processes
* only that vdev's scan queue. We can parallelize the I/O here because
* we know that each queue's io's only affect its own top-level vdev.
* we know that each queue's I/Os only affect its own top-level vdev.
*
* This function waits for the queue runs to complete, and must be
* called from dsl_scan_sync (or in general, syncing context).
@ -2830,7 +2830,7 @@ scan_io_queues_run(dsl_scan_t *scn)
}
/*
* Wait for the queues to finish issuing thir IOs for this run
* Wait for the queues to finish issuing their IOs for this run
* before we return. There may still be IOs in flight at this
* point.
*/
@ -2974,7 +2974,7 @@ dsl_scan_need_resilver(spa_t *spa, const dva_t *dva, size_t psize,
* This is the primary entry point for scans that is called from syncing
* context. Scans must happen entirely during syncing context so that we
* cna guarantee that blocks we are currently scanning will not change out
* from under us. While a scan is active, this funciton controls how quickly
* from under us. While a scan is active, this function controls how quickly
* transaction groups proceed, instead of the normal handling provided by
* txg_sync_thread().
*/
@ -3182,7 +3182,7 @@ dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
/*
* If we are over our checkpoint interval, set scn_clearing
* so that we can begin checkpointing immediately. The
* checkpoint allows us to save a consisent bookmark
* checkpoint allows us to save a consistent bookmark
* representing how much data we have scrubbed so far.
* Otherwise, use the memory limit to determine if we should
* scan for metadata or start issue scrub IOs. We accumulate