diff options
| author | Christoph Hellwig <hch@lst.de> | 2024-05-31 09:47:59 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-06-14 10:19:44 -0600 |
| commit | a23634644afc2f7c1bac98776440a1f3b161819e (patch) | |
| tree | 337e65d44993630798f529f1cdf9049e382b8cdc /block | |
| parent | a00d4bfce7c6d7fa4712b8133ec195c9bd142ae6 (diff) | |
block: take io_opt and io_min into account for max_sectors
The soft max_sectors limit is normally capped by the hardware limits and
an arbitrary upper limit enforced by the kernel, but can be modified by
the user. A few drivers want to increase this limit (nbd, rbd) or
adjust it up or down based on hardware capabilities (sd).
Change blk_validate_limits to default max_sectors to the optimal I/O
size, or upgrade it to the preferred minimal I/O size if that is
larger than the kernel default if no optimal I/O size is provided based
on the logic in the SD driver.
This keeps the existing kernel default for drivers that do not provide
an io_opt or very big io_min value, but picks a much more useful
default for those who provide these hints, and allows to remove the
hacks to set the user max_sectors limit in nbd, rbd and sd.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240531074837.1648501-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-settings.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index effeb9a639bb..a49abdb35548 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -153,6 +153,13 @@ static int blk_validate_limits(struct queue_limits *lim) if (lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE) return -EINVAL; lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors); + } else if (lim->io_opt) { + lim->max_sectors = + min(max_hw_sectors, lim->io_opt >> SECTOR_SHIFT); + } else if (lim->io_min && + lim->io_min > (BLK_DEF_MAX_SECTORS_CAP << SECTOR_SHIFT)) { + lim->max_sectors = + min(max_hw_sectors, lim->io_min >> SECTOR_SHIFT); } else { lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP); } |