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Btrfs: usage filter 

Select chunks that are less than X percent full.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2012-01-16 22:04:47 +02:00
parent ed25e9b26f
commit 5ce5b3c091
2 changed files with 37 additions and 0 deletions
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36
fs/btrfs/volumes.c
View File

@ -2120,6 +2120,36 @@ static int chunk_profiles_filter(u64 chunk_profile,
return 1;
}
static u64 div_factor_fine(u64 num, int factor)
{
if (factor <= 0)
return 0;
if (factor >= 100)
return num;
num *= factor;
do_div(num, 100);
return num;
}
static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
struct btrfs_balance_args *bargs)
{
struct btrfs_block_group_cache *cache;
u64 chunk_used, user_thresh;
int ret = 1;
cache = btrfs_lookup_block_group(fs_info, chunk_offset);
chunk_used = btrfs_block_group_used(&cache->item);
user_thresh = div_factor_fine(cache->key.offset, bargs->usage);
if (chunk_used < user_thresh)
ret = 0;
btrfs_put_block_group(cache);
return ret;
}
static int should_balance_chunk(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk, u64 chunk_offset)
@ -2147,6 +2177,12 @@ static int should_balance_chunk(struct btrfs_root *root,
return 0;
}
/* usage filter */
if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&
chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {
return 0;
}
return 1;
}

1
fs/btrfs/volumes.h
View File

@ -200,6 +200,7 @@ struct map_lookup {
* Balance filters
*/
#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
struct btrfs_balance_args;
struct btrfs_balance_control {