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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-12-18 09:25:37 -0800 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-12-18 14:23:41 -0500 |
| commit | c6d6e9b0f6b4201c77f2cea3964dd122697e3543 (patch) | |
| tree | 3acd02efdcc3ff01072f8ad9702ea9b0740d37e7 /drivers/md/dm-table.c | |
| parent | 74694bcbdf7e28a5ad548cdda9ac56d30be00d13 (diff) | |
| download | lwn-c6d6e9b0f6b4201c77f2cea3964dd122697e3543.tar.gz lwn-c6d6e9b0f6b4201c77f2cea3964dd122697e3543.zip | |
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>
Diffstat (limited to 'drivers/md/dm-table.c')
| -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 844f7d0f2ef8..4b1be754cc41 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, */ if (blk_queue_is_zoned(q)) blk_revalidate_disk_zones(t->md->disk); + + /* Allow reads to exceed readahead limits */ + q->backing_dev_info->io_pages = limits->max_sectors >> (PAGE_SHIFT - 9); } unsigned int dm_table_get_num_targets(struct dm_table *t) |