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MFV/ZoL: Fix zfs_vdev_aggregation_limit bounds checking

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Update the bounds checking for zfs_vdev_aggregation_limit so that
it has a floor of zero and a maximum value of the supported block
size for the pool.

Additionally add an early return when zfs_vdev_aggregation_limit
equals zero to disable aggregation.  For very fast solid state or
memory devices it may be more expensive to perform the aggregation
than to issue the IO immediately.

Author: Brian Behlendorf <behlendorf1@llnl.gov>
zfsonlinux/zfs@a58df6f536

MFV/ZoL: Cap maximum aggregate IO size

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.

Author: Brian Behlendorf <behlendorf1@llnl.gov>
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
zfsonlinux/zfs@2d678f779a
This commit is contained in:
Alexander Motin 2019-03-08 18:49:27 +00:00
parent 3a35ad54a8
commit 3a3ba532e7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=344926
1 changed files with 10 additions and 4 deletions
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14
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c
View File

@ -673,13 +673,18 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
zio_link_t *zl = NULL;
uint64_t maxgap = 0;
uint64_t size;
uint64_t limit;
int maxblocksize;
boolean_t stretch;
avl_tree_t *t;
enum zio_flag flags;
ASSERT(MUTEX_HELD(&vq->vq_lock));
if (zio->io_flags & ZIO_FLAG_DONT_AGGREGATE)
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);
first = last = zio;
@ -710,7 +715,7 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
t = vdev_queue_type_tree(vq, zio->io_type);
while (t != NULL && (dio = AVL_PREV(t, first)) != NULL &&
(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
IO_SPAN(dio, last) <= zfs_vdev_aggregation_limit &&
IO_SPAN(dio, last) <= limit &&
IO_GAP(dio, first) <= maxgap &&
dio->io_type == zio->io_type) {
first = dio;
@ -734,8 +739,9 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
*/
while ((dio = AVL_NEXT(t, last)) != NULL &&
(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
(IO_SPAN(first, dio) <= zfs_vdev_aggregation_limit ||
(IO_SPAN(first, dio) <= limit ||
(dio->io_flags & ZIO_FLAG_OPTIONAL)) &&
IO_SPAN(first, dio) <= maxblocksize &&
IO_GAP(last, dio) <= maxgap &&
dio->io_type == zio->io_type) {
last = dio;
@ -789,7 +795,7 @@ vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
return (NULL);
size = IO_SPAN(first, last);
ASSERT3U(size, <=, SPA_MAXBLOCKSIZE);
ASSERT3U(size, <=, maxblocksize);
aio = zio_vdev_delegated_io(first->io_vd, first->io_offset,
abd_alloc_for_io(size, B_TRUE), size, first->io_type,