Btrfs: usage filter
Select chunks that are less than X percent full. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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ed25e9b26f
Коммит
5ce5b3c091
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@ -2120,6 +2120,36 @@ static int chunk_profiles_filter(u64 chunk_profile,
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return 1;
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}
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static u64 div_factor_fine(u64 num, int factor)
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{
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if (factor <= 0)
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return 0;
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if (factor >= 100)
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return num;
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num *= factor;
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do_div(num, 100);
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return num;
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}
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static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
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struct btrfs_balance_args *bargs)
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{
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struct btrfs_block_group_cache *cache;
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u64 chunk_used, user_thresh;
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int ret = 1;
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cache = btrfs_lookup_block_group(fs_info, chunk_offset);
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chunk_used = btrfs_block_group_used(&cache->item);
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user_thresh = div_factor_fine(cache->key.offset, bargs->usage);
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if (chunk_used < user_thresh)
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ret = 0;
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btrfs_put_block_group(cache);
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return ret;
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}
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static int should_balance_chunk(struct btrfs_root *root,
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struct extent_buffer *leaf,
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struct btrfs_chunk *chunk, u64 chunk_offset)
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@ -2147,6 +2177,12 @@ static int should_balance_chunk(struct btrfs_root *root,
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return 0;
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}
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/* usage filter */
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if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&
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chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {
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return 0;
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}
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return 1;
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}
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@ -200,6 +200,7 @@ struct map_lookup {
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* Balance filters
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*/
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#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
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#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
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struct btrfs_balance_args;
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struct btrfs_balance_control {
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