From 428c8e03109e717d90e0d1329dc3d926b9421ad3 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Wed, 26 Oct 2022 23:25:14 +0200 Subject: btrfs: simplify percent calculation helpers, rename div_factor The div_factor* helpers calculate fraction or percentage fraction. The name is a bit confusing, we use it only for percentage calculations and there are two helpers. There's a helper mult_frac that's for general fractions, that tries to be accurate but we multiply and divide by small numbers so we can use the div_u64 helper. Rename the div_factor* helpers and use 1..100 percentage range, also drop the case checking for percentage == 100, it's never hit. The conversions: * div_factor calculates tenths and the numbers need to be adjusted * div_factor_fine is direct replacement Signed-off-by: David Sterba --- fs/btrfs/volumes.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'fs/btrfs/volumes.c') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 1c9f7a946657..7751ab620761 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3614,16 +3614,14 @@ static int chunk_usage_range_filter(struct btrfs_fs_info *fs_info, u64 chunk_off if (bargs->usage_min == 0) user_thresh_min = 0; else - user_thresh_min = div_factor_fine(cache->length, - bargs->usage_min); + user_thresh_min = mult_perc(cache->length, bargs->usage_min); if (bargs->usage_max == 0) user_thresh_max = 1; else if (bargs->usage_max > 100) user_thresh_max = cache->length; else - user_thresh_max = div_factor_fine(cache->length, - bargs->usage_max); + user_thresh_max = mult_perc(cache->length, bargs->usage_max); if (user_thresh_min <= chunk_used && chunk_used < user_thresh_max) ret = 0; @@ -3647,7 +3645,7 @@ static int chunk_usage_filter(struct btrfs_fs_info *fs_info, else if (bargs->usage > 100) user_thresh = cache->length; else - user_thresh = div_factor_fine(cache->length, bargs->usage); + user_thresh = mult_perc(cache->length, bargs->usage); if (chunk_used < user_thresh) ret = 0; @@ -5113,7 +5111,7 @@ static void init_alloc_chunk_ctl_policy_regular( ctl->devs_max = min_t(int, ctl->devs_max, BTRFS_MAX_DEVS_SYS_CHUNK); /* We don't want a chunk larger than 10% of writable space */ - ctl->max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), + ctl->max_chunk_size = min(mult_perc(fs_devices->total_rw_bytes, 10), ctl->max_chunk_size); ctl->dev_extent_min = BTRFS_STRIPE_LEN * ctl->dev_stripes; } @@ -5144,7 +5142,7 @@ static void init_alloc_chunk_ctl_policy_zoned( } /* We don't want a chunk larger than 10% of writable space */ - limit = max(round_down(div_factor(fs_devices->total_rw_bytes, 1), + limit = max(round_down(mult_perc(fs_devices->total_rw_bytes, 10), zone_size), min_chunk_size); ctl->max_chunk_size = min(limit, ctl->max_chunk_size); -- cgit v1.2.3