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mm: split off __bdi_set_max_ratio() function

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This splits off __bdi_set_max_ratio() from bdi_set_max_ratio().
__bdi_set_max_ratio() will also be called from bdi_set_max_bytes(),
which will be introduced in the next patch.

Link: https://lkml.kernel.org/r/20221119005215.3052436-7-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>
This commit is contained in:
Stefan Roesch 2022-11-18 16:52:01 -08:00 • committed by Andrew Morton
parent 00df7d5126
commit efc3e6ad53
1 changed files with 9 additions and 5 deletions
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14
mm/page-writeback.c
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@ -692,14 +692,10 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
return ret; return ret;
} }
int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio) static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
{ {
int ret = 0; int ret = 0;
if (max_ratio > 100)
return -EINVAL;
max_ratio *= BDI_RATIO_SCALE;
spin_lock_bh(&bdi_lock); spin_lock_bh(&bdi_lock);
if (bdi->min_ratio > max_ratio) { if (bdi->min_ratio > max_ratio) {
ret = -EINVAL; ret = -EINVAL;
@ -711,6 +707,14 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
return ret; return ret;
} }
int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
{
if (max_ratio > 100)
return -EINVAL;
return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
}
EXPORT_SYMBOL(bdi_set_max_ratio); EXPORT_SYMBOL(bdi_set_max_ratio);
u64 bdi_get_max_bytes(struct backing_dev_info *bdi) u64 bdi_get_max_bytes(struct backing_dev_info *bdi)