evie/android_kernel_oneplus_msm8998
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UPSTREAM: dm: do not allow readahead to limit IO size

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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
This commit is contained in:
Jaegeuk Kim 2018-12-18 05:43:41 -08:00 • committed by Alistair Strachan
parent f2d65ea603
commit d0c3914ffb
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-table.c
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@ -1542,6 +1542,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
smp_mb(); smp_mb();
if (dm_table_request_based(t)) if (dm_table_request_based(t))
queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); 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) unsigned int dm_table_get_num_targets(struct dm_table *t)