btrfs: qgroup: Skeleton to support separate qgroup reservation type

Instead of single qgroup->reserved, use a new structure btrfs_qgroup_rsv
to store different types of reservation.

This patch only updates the header needed to compile.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 569f9ab..d6ab07f 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2434,7 +2434,8 @@ out:
 }
 
 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
-                              u64 ref_root, u64 num_bytes)
+                              u64 ref_root, u64 num_bytes,
+                              enum btrfs_qgroup_rsv_type type)
 {
        struct btrfs_root *quota_root;
        struct btrfs_qgroup *qgroup;
@@ -2925,7 +2926,8 @@ static int qgroup_free_reserved_data(struct inode *inode,
                        goto out;
                freed += changeset.bytes_changed;
        }
-       btrfs_qgroup_free_refroot(root->fs_info, root->objectid, freed);
+       btrfs_qgroup_free_refroot(root->fs_info, root->objectid, freed,
+                                 BTRFS_QGROUP_RSV_DATA);
        ret = freed;
 out:
        extent_changeset_release(&changeset);
@@ -2957,7 +2959,7 @@ static int __btrfs_qgroup_release_data(struct inode *inode,
        if (free)
                btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
                                BTRFS_I(inode)->root->objectid,
-                               changeset.bytes_changed);
+                               changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
        ret = changeset.bytes_changed;
 out:
        extent_changeset_release(&changeset);
@@ -3034,7 +3036,8 @@ void btrfs_qgroup_free_meta_all(struct btrfs_root *root)
        if (reserved == 0)
                return;
        trace_qgroup_meta_reserve(root, -(s64)reserved);
-       btrfs_qgroup_free_refroot(fs_info, root->objectid, reserved);
+       btrfs_qgroup_free_refroot(fs_info, root->objectid, reserved,
+                                 BTRFS_QGROUP_RSV_META);
 }
 
 void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
@@ -3049,7 +3052,8 @@ void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
        WARN_ON(atomic64_read(&root->qgroup_meta_rsv) < num_bytes);
        atomic64_sub(num_bytes, &root->qgroup_meta_rsv);
        trace_qgroup_meta_reserve(root, -(s64)num_bytes);
-       btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes);
+       btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes,
+                                 BTRFS_QGROUP_RSV_META);
 }
 
 /*
@@ -3077,7 +3081,7 @@ void btrfs_qgroup_check_reserved_leak(struct inode *inode)
                }
                btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
                                BTRFS_I(inode)->root->objectid,
-                               changeset.bytes_changed);
+                               changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
 
        }
        extent_changeset_release(&changeset);

diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index ad00348..b5ee229 100644 (file)
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -61,6 +61,26 @@ struct btrfs_qgroup_extent_record {
        struct ulist *old_roots;
 };
 
+enum btrfs_qgroup_rsv_type {
+       BTRFS_QGROUP_RSV_DATA = 0,
+       BTRFS_QGROUP_RSV_META,
+       BTRFS_QGROUP_RSV_LAST,
+};
+
+/*
+ * Represents how many bytes we have reserved for this qgroup.
+ *
+ * Each type should have different reservation behavior.
+ * E.g, data follows its io_tree flag modification, while
+ * *currently* meta is just reserve-and-clear during transcation.
+ *
+ * TODO: Add new type for reservation which can survive transaction commit.
+ * Currect metadata reservation behavior is not suitable for such case.
+ */
+struct btrfs_qgroup_rsv {
+       u64 values[BTRFS_QGROUP_RSV_LAST];
+};
+
 /*
  * one struct for each qgroup, organized in fs_info->qgroup_tree.
  */
@@ -88,6 +108,7 @@ struct btrfs_qgroup {
         * reservation tracking
         */
        u64 reserved;
+       struct btrfs_qgroup_rsv rsv;
 
        /*
         * lists
@@ -227,12 +248,14 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
                         struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
                         struct btrfs_qgroup_inherit *inherit);
 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
-                              u64 ref_root, u64 num_bytes);
+                              u64 ref_root, u64 num_bytes,
+                              enum btrfs_qgroup_rsv_type type);
 static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info,
                                                 u64 ref_root, u64 num_bytes)
 {
        trace_btrfs_qgroup_free_delayed_ref(fs_info, ref_root, num_bytes);
-       btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes);
+       btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes,
+                                 BTRFS_QGROUP_RSV_DATA);
 }
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS