refactor: move ecstore pool-space builder (#3651)

crates/ecstore/src/layout/pool_space.rs

@@ -14,6 +14,11 @@
 
 use std::slice::Iter;
 
+use crate::bucket::utils::is_meta_bucketname;
+use crate::disk::DiskInfo;
+use crate::error::{Error, Result};
+use crate::global::{DISK_ASSUME_UNKNOWN_SIZE, DISK_FILL_FRACTION, DISK_MIN_INODES, is_erasure_sd};
+
 #[derive(Debug, Default, Clone)]
 pub struct PoolAvailableSpace {
     pub index: usize,
@@ -68,10 +73,118 @@ impl ServerPoolsAvailableSpace {
     }
 }
 
+pub async fn has_space_for(dis: &[Option<DiskInfo>], size: i64) -> Result<bool> {
+    let size = { if size < 0 { DISK_ASSUME_UNKNOWN_SIZE } else { size as u64 * 2 } };
+
+    let mut available = 0;
+    let mut total = 0;
+    let mut disks_num = 0;
+
+    for disk in dis.iter().flatten() {
+        disks_num += 1;
+        total += disk.total;
+        available += disk.total - disk.used;
+    }
+
+    if disks_num < dis.len() / 2 || disks_num == 0 {
+        return Err(Error::other(format!(
+            "not enough online disks to calculate the available space,need {}, found {}",
+            (dis.len() / 2) + 1,
+            disks_num,
+        )));
+    }
+
+    let per_disk = size / disks_num as u64;
+
+    for disk in dis.iter().flatten() {
+        if !is_erasure_sd().await && disk.free_inodes < DISK_MIN_INODES && disk.used_inodes > 0 {
+            return Ok(false);
+        }
+
+        if disk.free <= per_disk {
+            return Ok(false);
+        }
+    }
+
+    if available < size {
+        return Ok(false);
+    }
+    available -= size;
+
+    let want = total as f64 * (1.0 - DISK_FILL_FRACTION);
+
+    Ok(available > want as u64)
+}
+
+pub(crate) async fn build_server_pools_available_space(
+    bucket: &str,
+    size: i64,
+    n_sets: &[usize],
+    infos: &[Vec<Option<DiskInfo>>],
+) -> ServerPoolsAvailableSpace {
+    let mut server_pools = vec![PoolAvailableSpace::default(); infos.len()];
+
+    for (i, zinfo) in infos.iter().enumerate() {
+        if zinfo.is_empty() {
+            server_pools[i] = PoolAvailableSpace {
+                index: i,
+                ..Default::default()
+            };
+
+            continue;
+        }
+
+        if !is_meta_bucketname(bucket) && !has_space_for(zinfo, size).await.unwrap_or_default() {
+            server_pools[i] = PoolAvailableSpace {
+                index: i,
+                ..Default::default()
+            };
+
+            continue;
+        }
+
+        let mut available = 0;
+        let mut max_used_pct = 0;
+        for disk in zinfo.iter().flatten() {
+            if disk.total == 0 {
+                continue;
+            }
+
+            available += disk.total - disk.used;
+
+            let pct_used = disk.used * 100 / disk.total;
+
+            if pct_used > max_used_pct {
+                max_used_pct = pct_used;
+            }
+        }
+
+        available *= n_sets[i] as u64;
+
+        server_pools[i] = PoolAvailableSpace {
+            index: i,
+            available,
+            max_used_pct,
+        }
+    }
+
+    ServerPoolsAvailableSpace(server_pools)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
+    fn disk_info(total: u64, used: u64, free: u64) -> DiskInfo {
+        DiskInfo {
+            total,
+            used,
+            free,
+            free_inodes: 1_024,
+            ..Default::default()
+        }
+    }
+
     #[test]
     fn pool_available_space_creation_preserves_fields() {
         let space = PoolAvailableSpace {
@@ -123,4 +236,37 @@ mod tests {
 
         assert_eq!(indexes, vec![0]);
     }
+
+    #[tokio::test]
+    async fn build_server_pools_available_space_returns_zero_for_empty_pool_info() {
+        let spaces = build_server_pools_available_space("bucket-a", 64, &[1], &[Vec::new()]).await;
+
+        assert_eq!(spaces.0.len(), 1);
+        assert_eq!(spaces.0[0].index, 0);
+        assert_eq!(spaces.0[0].available, 0);
+        assert_eq!(spaces.0[0].max_used_pct, 0);
+    }
+
+    #[tokio::test]
+    async fn build_server_pools_available_space_computes_available_capacity_and_max_used_pct() {
+        let infos = vec![vec![Some(disk_info(1_000, 100, 900)), Some(disk_info(1_000, 200, 800))]];
+
+        let spaces = build_server_pools_available_space("bucket-a", 64, &[2], &infos).await;
+
+        assert_eq!(spaces.0.len(), 1);
+        assert_eq!(spaces.0[0].index, 0);
+        assert_eq!(spaces.0[0].available, 3_400);
+        assert_eq!(spaces.0[0].max_used_pct, 20);
+    }
+
+    #[tokio::test]
+    async fn build_server_pools_available_space_skips_capacity_guard_for_meta_bucket() {
+        let infos = vec![vec![Some(disk_info(10, 9, 1)), Some(disk_info(10, 9, 1))]];
+
+        let spaces = build_server_pools_available_space(crate::disk::RUSTFS_META_BUCKET, 1_024, &[1], &infos).await;
+
+        assert_eq!(spaces.0.len(), 1);
+        assert_eq!(spaces.0[0].available, 2);
+        assert_eq!(spaces.0[0].max_used_pct, 90);
+    }
 }

crates/ecstore/src/store.rs

@@ -44,10 +44,9 @@ use crate::error::{
 };
 use crate::event_notification::EventNotifier;
 use crate::global::{
-    DISK_ASSUME_UNKNOWN_SIZE, DISK_FILL_FRACTION, DISK_MIN_INODES, DISK_RESERVE_FRACTION, GLOBAL_BOOT_TIME,
-    GLOBAL_LOCAL_DISK_MAP, GLOBAL_LOCAL_DISK_SET_DRIVES, TypeLocalDiskSetDrives, get_global_deployment_id, get_global_endpoints,
-    get_global_region, get_global_tier_config_mgr, init_global_bucket_monitor, is_erasure_sd, set_global_deployment_id,
-    set_object_layer,
+    DISK_RESERVE_FRACTION, GLOBAL_BOOT_TIME, GLOBAL_LOCAL_DISK_MAP, GLOBAL_LOCAL_DISK_SET_DRIVES, TypeLocalDiskSetDrives,
+    get_global_deployment_id, get_global_endpoints, get_global_region, get_global_tier_config_mgr, init_global_bucket_monitor,
+    set_global_deployment_id, set_object_layer,
 };
 use crate::notification_sys::get_global_notification_sys;
 use crate::pools::PoolMeta;
@@ -105,7 +104,7 @@ type ListObjectVersionsInfo = StorageListObjectVersionsInfo<ObjectInfo>;
 type ObjectInfoOrErr = StorageObjectInfoOrErr<ObjectInfo, Error>;
 type WalkOptions = StorageWalkOptions<fn(&FileInfo) -> bool>;
 
-pub use crate::layout::pool_space::{PoolAvailableSpace, ServerPoolsAvailableSpace};
+pub use crate::layout::pool_space::{PoolAvailableSpace, ServerPoolsAvailableSpace, has_space_for};
 
 /// Check if a directory contains any xl.meta files (indicating actual S3 objects)
 /// This is used to determine if a bucket is empty for deletion purposes.
@@ -178,7 +177,7 @@ mod rebalance;
 use peer::init_local_peer;
 pub use peer::{
     all_local_disk, all_local_disk_path, find_local_disk, find_local_disk_by_ref, get_disk_infos, get_disk_via_endpoint,
-    has_space_for, init_local_disks, init_lock_clients, prewarm_local_disk_id_map,
+    init_local_disks, init_lock_clients, prewarm_local_disk_id_map,
 };
 
 pub struct ECStore {

crates/ecstore/src/store/peer.rs

@@ -239,47 +239,3 @@ pub async fn get_disk_infos(disks: &[Option<DiskStore>]) -> Vec<Option<DiskInfo>
 
     res
 }
-
-pub async fn has_space_for(dis: &[Option<DiskInfo>], size: i64) -> Result<bool> {
-    let size = { if size < 0 { DISK_ASSUME_UNKNOWN_SIZE } else { size as u64 * 2 } };
-
-    let mut available = 0;
-    let mut total = 0;
-    let mut disks_num = 0;
-
-    for disk in dis.iter().flatten() {
-        disks_num += 1;
-        total += disk.total;
-        available += disk.total - disk.used;
-    }
-
-    if disks_num < dis.len() / 2 || disks_num == 0 {
-        return Err(Error::other(format!(
-            "not enough online disks to calculate the available space,need {}, found {}",
-            (dis.len() / 2) + 1,
-            disks_num,
-        )));
-    }
-
-    let per_disk = size / disks_num as u64;
-
-    for disk in dis.iter().flatten() {
-        if !is_erasure_sd().await && disk.free_inodes < DISK_MIN_INODES && disk.used_inodes > 0 {
-            return Ok(false);
-        }
-
-        if disk.free <= per_disk {
-            return Ok(false);
-        }
-    }
-
-    if available < size {
-        return Ok(false);
-    }
-
-    available -= size;
-
-    let want = total as f64 * (1.0 - DISK_FILL_FRACTION);
-
-    Ok(available > want as u64)
-}

crates/ecstore/src/store/rebalance.rs

@@ -14,6 +14,7 @@
 
 use super::*;
 use crate::config::get_global_storage_class;
+use crate::layout::pool_space::build_server_pools_available_space;
 use rustfs_storage_api::{NamespaceLocking as _, ObjectOperations as _, StorageAdminApi};
 pub(in crate::store) mod support;
 use support::{
@@ -22,61 +23,6 @@ use support::{
     resolve_rebalance_delete_from_all_pools_results, resolve_store_rebalance_pool_meta_reload_result,
 };
 
-async fn build_server_pools_available_space(
-    bucket: &str,
-    size: i64,
-    n_sets: &[usize],
-    infos: &[Vec<Option<DiskInfo>>],
-) -> ServerPoolsAvailableSpace {
-    let mut server_pools = vec![PoolAvailableSpace::default(); infos.len()];
-
-    for (i, zinfo) in infos.iter().enumerate() {
-        if zinfo.is_empty() {
-            server_pools[i] = PoolAvailableSpace {
-                index: i,
-                ..Default::default()
-            };
-
-            continue;
-        }
-
-        if !is_meta_bucketname(bucket) && !has_space_for(zinfo, size).await.unwrap_or_default() {
-            server_pools[i] = PoolAvailableSpace {
-                index: i,
-                ..Default::default()
-            };
-
-            continue;
-        }
-
-        let mut available = 0;
-        let mut max_used_pct = 0;
-        for disk in zinfo.iter().flatten() {
-            if disk.total == 0 {
-                continue;
-            }
-
-            available += disk.total - disk.used;
-
-            let pct_used = disk.used * 100 / disk.total;
-
-            if pct_used > max_used_pct {
-                max_used_pct = pct_used;
-            }
-        }
-
-        available *= n_sets[i] as u64;
-
-        server_pools[i] = PoolAvailableSpace {
-            index: i,
-            available,
-            max_used_pct,
-        }
-    }
-
-    ServerPoolsAvailableSpace(server_pools)
-}
-
 impl ECStore {
     #[instrument(level = "debug", skip(self))]
     pub(super) async fn delete_all(&self, bucket: &str, prefix: &str) -> Result<()> {
@@ -700,7 +646,6 @@ impl ECStore {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::disk::DiskInfo;
 
     fn object_info_with_mod_time(unix_ts: i64, delete_marker: bool) -> ObjectInfo {
         ObjectInfo {
@@ -710,16 +655,6 @@ mod tests {
         }
     }
 
-    fn disk_info(total: u64, used: u64, free: u64) -> DiskInfo {
-        DiskInfo {
-            total,
-            used,
-            free,
-            free_inodes: 1_024,
-            ..Default::default()
-        }
-    }
-
     #[test]
     fn resolve_latest_object_info_candidates_returns_latest_delete_marker() {
         let candidates = vec![
@@ -1008,37 +943,4 @@ mod tests {
                 .contains("failed to resolve rebalance disk set: pool index 2, set index 7, pool count 3")
         );
     }
-
-    #[tokio::test]
-    async fn build_server_pools_available_space_returns_zero_for_empty_pool_info() {
-        let spaces = build_server_pools_available_space("bucket-a", 64, &[1], &[Vec::new()]).await;
-
-        assert_eq!(spaces.0.len(), 1);
-        assert_eq!(spaces.0[0].index, 0);
-        assert_eq!(spaces.0[0].available, 0);
-        assert_eq!(spaces.0[0].max_used_pct, 0);
-    }
-
-    #[tokio::test]
-    async fn build_server_pools_available_space_computes_available_capacity_and_max_used_pct() {
-        let infos = vec![vec![Some(disk_info(1_000, 100, 900)), Some(disk_info(1_000, 200, 800))]];
-
-        let spaces = build_server_pools_available_space("bucket-a", 64, &[2], &infos).await;
-
-        assert_eq!(spaces.0.len(), 1);
-        assert_eq!(spaces.0[0].index, 0);
-        assert_eq!(spaces.0[0].available, 3_400);
-        assert_eq!(spaces.0[0].max_used_pct, 20);
-    }
-
-    #[tokio::test]
-    async fn build_server_pools_available_space_skips_capacity_guard_for_meta_bucket() {
-        let infos = vec![vec![Some(disk_info(10, 9, 1)), Some(disk_info(10, 9, 1))]];
-
-        let spaces = build_server_pools_available_space(crate::disk::RUSTFS_META_BUCKET, 1_024, &[1], &infos).await;
-
-        assert_eq!(spaces.0.len(), 1);
-        assert_eq!(spaces.0[0].available, 2);
-        assert_eq!(spaces.0[0].max_used_pct, 90);
-    }
 }

docs/architecture/migration-progress.md

@@ -5,18 +5,18 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 ## Current Context
 
 - Issue: [`rustfs/backlog#660`](https://github.com/rustfs/backlog/issues/660)
-- Branch: `overtrue/arch-ecstore-rebalance-helper-boundary`
-- Baseline: completed `E-005/E-LAYOUT-004`.
+- Branch: `overtrue/arch-ecstore-layout-pool-space-builder`
+- Baseline: completed `E-006/E-REBALANCE-001`.
 - Stacked on: merged ECStore layout foundation, format layout ownership, and
   endpoint layout move slices plus the set-format heal and pool-space layout
-  helper slices.
+  helper slices and the rebalance support helper boundary slice.
 - PR type for this branch: `pure-move`
 - Runtime behavior changes: none.
-- Rust code changes: move ECStore rebalance support helper types and pure
-  result reducers into a local rebalance support boundary while preserving
-  store orchestration.
+- Rust code changes: move ECStore capacity checks and pool-space builder logic
+  into the layout pool-space owner while preserving the old `store` export path
+  and rebalance orchestration.
 - CI/script changes: none.
-- Docs changes: record the ECStore rebalance support helper boundary slice.
+- Docs changes: record the ECStore pool-space builder layout slice.
 
 ## Phase 0 Tasks
 
@@ -2299,10 +2299,25 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
     checks, migration/layer guards, formatting, diff hygiene, Rust risk scan,
     branch freshness check, pre-commit quality gate, and three-expert review.
 
+- [x] `E-007/E-LAYOUT-005` Move ECStore pool-space builder helpers.
+  - Do: move `has_space_for` and server-pool available-space construction into
+    the ECStore layout pool-space owner while keeping `store::has_space_for`
+    source-compatible through re-export.
+  - Acceptance: `layout::pool_space` owns capacity checks, pool availability
+    construction, filter helpers, and focused tests; rebalance only gathers
+    runtime disk snapshots and calls the layout owner.
+  - Must preserve: unknown-size handling, erasure fill-fraction math,
+    inode/free-space guard behavior, meta-bucket capacity bypass, pool index
+    ordering, available-space summation, and rebalance pool selection.
+  - Verification: focused ECStore pool-space and rebalance tests,
+    ECStore/RustFS/Heal compile checks, migration/layer guards, formatting,
+    diff hygiene, Rust risk scan, branch freshness check, pre-commit quality
+    gate, and three-expert review.
+
 ## Next PRs
 
 1. `pure-move`: continue moving ECStore rebalance/layout support helpers once
-   E-006/E-REBALANCE-001 lands.
+   E-007/E-LAYOUT-005 lands.
 2. `pure-move`: continue pruning residual embedded startup-only orchestration
    once the lifecycle helpers are merged.
 
@@ -2310,9 +2325,9 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 
 | Expert | Status | Notes |
 |---|---|---|
-| Quality/architecture | passed | E-006/E-REBALANCE-001 extracts rebalance support helpers into a local boundary without moving async store orchestration. |
-| Migration preservation | passed | Latest-object tie-breaks, delete aggregation, pool lookup error classification, and sibling `store` visibility remain preserved. |
-| Testing/verification | passed | Focused rebalance tests, compile checks, guards, formatting, diff hygiene, Rust risk scan, and full pre-commit passed. |
+| Quality/architecture | passed | E-007/E-LAYOUT-005 moves capacity and pool-space construction into the layout owner while leaving rebalance orchestration in place. |
+| Migration preservation | passed | Capacity math, inode/free-space guards, meta-bucket bypass, pool ordering, and old `store::has_space_for` imports remain preserved. |
+| Testing/verification | passed | Focused pool-space/rebalance tests, compile checks, guards, formatting, diff hygiene, Rust risk scan, and full pre-commit passed. |
 
 ## Verification Notes
 
@@ -2437,6 +2452,19 @@ Passed before push:
   - `make pre-commit`: passed.
   - Three-expert review: passed.
 
+- Issue #660 E-007/E-LAYOUT-005 current slice:
+  - `cargo test -p rustfs-ecstore layout::pool_space -- --nocapture`: passed.
+  - `cargo test -p rustfs-ecstore store::rebalance -- --nocapture`: passed.
+  - `cargo check -p rustfs-ecstore -p rustfs -p rustfs-heal`: passed.
+  - `./scripts/check_architecture_migration_rules.sh`: passed.
+  - `./scripts/check_layer_dependencies.sh`: passed.
+  - `cargo fmt --all --check`: passed.
+  - `git diff --check`: passed.
+  - Rust risk scan on changed Rust files: passed; added cast lines are moved
+    capacity math from the existing implementation.
+  - `make pre-commit`: passed.
+  - Three-expert review: passed.
+
 - Issue #660 X-012 current slice:
   - `cargo test -p rustfs-extension-schema`: passed.
   - `cargo check -p rustfs-extension-schema`: passed.