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mm: add bdi_set_max_ratio_no_scale() function
This introduces bdi_set_max_ratio_no_scale(). It uses the max granularity for the ratio. This function by the new sysfs knob max_ratio_fine. Link: https://lkml.kernel.org/r/20221119005215.3052436-16-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Cc: Chris Mason <clm@meta.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -109,6 +109,7 @@ u64 bdi_get_min_bytes(struct backing_dev_info *bdi);
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u64 bdi_get_max_bytes(struct backing_dev_info *bdi);
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int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio);
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int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
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int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio);
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int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 min_bytes);
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int bdi_set_max_bytes(struct backing_dev_info *bdi, u64 max_bytes);
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int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit);
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@ -719,6 +719,9 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
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{
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int ret = 0;
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if (max_ratio > 100 * BDI_RATIO_SCALE)
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return -EINVAL;
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spin_lock_bh(&bdi_lock);
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if (bdi->min_ratio > max_ratio) {
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ret = -EINVAL;
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@ -731,6 +734,11 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
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return ret;
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}
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int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio)
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{
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return __bdi_set_max_ratio(bdi, max_ratio);
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}
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int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
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{
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return __bdi_set_min_ratio(bdi, min_ratio * BDI_RATIO_SCALE);
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@ -738,9 +746,6 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
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int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
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{
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if (max_ratio > 100)
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return -EINVAL;
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return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
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}
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EXPORT_SYMBOL(bdi_set_max_ratio);
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