diff options
| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-12-18 05:43:41 -0800 |
|---|---|---|
| committer | Alistair Strachan <astrachan@google.com> | 2019-01-23 21:19:03 +0000 |
| commit | 80fa62ba17e88da86d5a5d4761da963b79c6c6ed (patch) | |
| tree | 09545ea2eb11d441235abda58745cb8130ce3bf2 | |
| parent | f74ba31bd8e82360c4d85e5decd88e0b55e3d853 (diff) | |
UPSTREAM: dm: do not allow readahead to limit IO size
Update DM to set the bdi's io_pages. This fixes reads to be capped at
the device's max request size (even if user's read IO exceeds the
established readahead setting).
Fixes: 9491ae4a ("mm: don't cap request size based on read-ahead setting")
Cc: stable@vger.kernel.org
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
(cherry picked from commit c6d6e9b0f6b4201c77f2cea3964dd122697e3543)
Bug: 120757803
Link: https://patchwork.kernel.org/patch/10746255/
Change-Id: I876f4c5425253c2a0876d5ef7fefe36c4edcb46c
| -rw-r--r-- | drivers/md/dm-table.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 0e79a435e8bd..b4775407ece8 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1638,6 +1638,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, smp_mb(); if (dm_table_request_based(t)) queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); + + /* io_pages is used for readahead */ + q->backing_dev_info.io_pages = limits->max_sectors >> (PAGE_SHIFT - 9); } unsigned int dm_table_get_num_targets(struct dm_table *t) |