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Cap maximum aggregate IO size

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Commit 8542ef8 allowed optional IOs to be aggregated beyond
the specified aggregation limit.  Since the aggregation limit
was also used to enforce the maximum block size, setting
`zfs_vdev_aggregation_limit=16777216` could result in an
attempt to allocate an ABD larger than 16M.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #6259 
Closes #6270
This commit is contained in:
Brian Behlendorf 2017-06-27 10:09:16 -07:00 committed by GitHub
parent 47770d30f2
commit 2d678f779a
1 changed files with 5 additions and 2 deletions
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7
module/zfs/vdev_queue.c
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@ -521,13 +521,14 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
uint64_t maxgap = 0;
uint64_t size;
uint64_t limit;
int maxblocksize;
boolean_t stretch = B_FALSE;
avl_tree_t *t = vdev_queue_type_tree(vq, zio->io_type);
enum zio_flag flags = zio->io_flags & ZIO_FLAG_AGG_INHERIT;
abd_t *abd;
limit = MAX(MIN(zfs_vdev_aggregation_limit,
spa_maxblocksize(vq->vq_vdev->vdev_spa)), 0);
maxblocksize = spa_maxblocksize(vq->vq_vdev->vdev_spa);
limit = MAX(MIN(zfs_vdev_aggregation_limit, maxblocksize), 0);
if (zio->io_flags & ZIO_FLAG_DONT_AGGREGATE || limit == 0)
return (NULL);
@ -584,6 +585,7 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
(IO_SPAN(first, dio) <= limit ||
(dio->io_flags & ZIO_FLAG_OPTIONAL)) &&
IO_SPAN(first, dio) <= maxblocksize &&
IO_GAP(last, dio) <= maxgap) {
last = dio;
if (!(last->io_flags & ZIO_FLAG_OPTIONAL))
@ -635,6 +637,7 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
return (NULL);
size = IO_SPAN(first, last);
ASSERT3U(size, <=, maxblocksize);
abd = abd_alloc_for_io(size, B_TRUE);
if (abd == NULL)