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block: refactor disk_update_readahead

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Factor out a blk_apply_bdi_limits limits helper that can be used with
an explicit queue_limits argument, which will be useful later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-02-13 08:34:12 +01:00 committed by Jens Axboe
parent 8c4955c069
commit b9947297d0
1 changed files with 12 additions and 9 deletions
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21
block/blk-settings.c
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@ -85,6 +85,17 @@ void blk_set_stacking_limits(struct queue_limits *lim)
}
EXPORT_SYMBOL(blk_set_stacking_limits);
static void blk_apply_bdi_limits(struct backing_dev_info *bdi,
struct queue_limits *lim)
{
/*
* For read-ahead of large files to be effective, we need to read ahead
* at least twice the optimal I/O size.
*/
bdi->ra_pages = max(lim->io_opt * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);
bdi->io_pages = lim->max_sectors >> PAGE_SECTORS_SHIFT;
}
/**
* blk_queue_bounce_limit - set bounce buffer limit for queue
* @q: the request queue for the device
@ -393,15 +404,7 @@ EXPORT_SYMBOL(blk_queue_alignment_offset);
void disk_update_readahead(struct gendisk *disk)
{
struct request_queue *q = disk->queue;
/*
* For read-ahead of large files to be effective, we need to read ahead
* at least twice the optimal I/O size.
*/
disk->bdi->ra_pages =
max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);
disk->bdi->io_pages = queue_max_sectors(q) >> (PAGE_SHIFT - 9);
blk_apply_bdi_limits(disk->bdi, &disk->queue->limits);
}
EXPORT_SYMBOL_GPL(disk_update_readahead);