This is a note to let you know that I've just added the patch titled block: ensure bdi->io_pages is always initialized to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: block-ensure-bdi-io_pages-is-always-initialized.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From de1b0ee490eafdf65fac9eef9925391a8369f2dc Mon Sep 17 00:00:00 2001 From: Jens Axboe <axboe@xxxxxxxxx> Date: Mon, 31 Aug 2020 11:20:02 -0600 Subject: block: ensure bdi->io_pages is always initialized From: Jens Axboe <axboe@xxxxxxxxx> commit de1b0ee490eafdf65fac9eef9925391a8369f2dc upstream. If a driver leaves the limit settings as the defaults, then we don't initialize bdi->io_pages. This means that file systems may need to work around bdi->io_pages == 0, which is somewhat messy. Initialize the default value just like we do for ->ra_pages. Cc: stable@xxxxxxxxxxxxxxx Fixes: 9491ae4aade6 ("mm: don't cap request size based on read-ahead setting") Reported-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/blk-core.c | 1 + 1 file changed, 1 insertion(+) --- a/block/blk-core.c +++ b/block/blk-core.c @@ -526,6 +526,7 @@ struct request_queue *__blk_alloc_queue( goto fail_stats; q->backing_dev_info->ra_pages = VM_READAHEAD_PAGES; + q->backing_dev_info->io_pages = VM_READAHEAD_PAGES; q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK; q->node = node_id; Patches currently in stable-queue which might be from axboe@xxxxxxxxx are queue-5.8/block-ensure-bdi-io_pages-is-always-initialized.patch queue-5.8/block-allow-for_each_bvec-to-support-zero-len-bvec.patch queue-5.8/block-fix-locking-in-bdev_del_partition.patch queue-5.8/blk-stat-make-q-stats-lock-irqsafe.patch queue-5.8/nbd-restore-default-timeout-when-setting-it-to-zero.patch queue-5.8/io_uring-fix-removing-the-wrong-file-in-__io_sqe_files_update.patch queue-5.8/libata-implement-ata_horkage_max_trim_128m-and-apply-to-sandisks.patch queue-5.8/io_uring-set-table-files-to-null-when-io_sqe_file_register-failed.patch queue-5.8/nvmet-disable-keep-alive-timer-when-kato-is-cleared-.patch queue-5.8/blk-iocost-ioc_pd_free-shouldn-t-assume-irq-disabled.patch