[PATCH 10/21] Btrfs: usage filter
From: Ilya Dryomov <idryomov@gmail.com>
Date: 2011-08-23 20:01:51
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
Select chunks that are less than X percent full. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> --- fs/btrfs/volumes.c | 33 +++++++++++++++++++++++++++++++++ fs/btrfs/volumes.h | 1 + 2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f045615..b49ecfa 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c@@ -2193,6 +2193,33 @@ static int chunk_profiles_filter(u64 chunk_profile, return 1; } +static u64 div_factor_fine(u64 num, int factor) +{ + 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_restripe_args *rargs) +{ + 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, rargs->usage); + if (chunk_used < user_thresh) + ret = 0; + + btrfs_put_block_group(cache); + return ret; +} + static int chunk_soft_convert_filter(u64 chunk_profile, struct btrfs_restripe_args *rargs) {
@@ -2236,6 +2263,12 @@ static int should_restripe_chunk(struct btrfs_root *root, return 0; } + /* usage filter */ + if ((rargs->flags & BTRFS_RESTRIPE_ARGS_USAGE) && + chunk_usage_filter(rctl->fs_info, chunk_offset, rargs)) { + return 0; + } + /* soft profile changing mode */ if ((rargs->flags & BTRFS_RESTRIPE_ARGS_SOFT) && chunk_soft_convert_filter(chunk_type, rargs)) {
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 9f96ad8..c6baf4b 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h@@ -186,6 +186,7 @@ struct map_lookup { * Restripe filters */ #define BTRFS_RESTRIPE_ARGS_PROFILES (1ULL << 0) +#define BTRFS_RESTRIPE_ARGS_USAGE (1ULL << 1) /* * Profile changing flags. When SOFT is set we won't relocate chunk if
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1.7.5.4