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Diffstat (limited to 'block/blk-settings.c')
| -rw-r--r-- | block/blk-settings.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 1989a177be20..865fe4ebbf9b 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -892,6 +892,31 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, EXPORT_SYMBOL(blk_stack_limits); /** + * queue_limits_stack_bdev - adjust queue_limits for stacked devices + * @t: the stacking driver limits (top device) + * @bdev: the underlying block device (bottom) + * @offset: offset to beginning of data within component device + * @pfx: prefix to use for warnings logged + * + * Description: + * This function is used by stacking drivers like MD and DM to ensure + * that all component devices have compatible block sizes and + * alignments. The stacking driver must provide a queue_limits + * struct (top) and then iteratively call the stacking function for + * all component (bottom) devices. The stacking function will + * attempt to combine the values and ensure proper alignment. + */ +void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, + sector_t offset, const char *pfx) +{ + if (blk_stack_limits(t, &bdev_get_queue(bdev)->limits, + get_start_sect(bdev) + offset)) + pr_notice("%s: Warning: Device %pg is misaligned\n", + pfx, bdev); +} +EXPORT_SYMBOL_GPL(queue_limits_stack_bdev); + +/** * disk_stack_limits - adjust queue limits for stacked drivers * @disk: MD/DM gendisk (top) * @bdev: the underlying block device (bottom) |