btrfs: qgroup: Don't use root->qgroup_meta_rsv for qgroup

Since qgroup has seperate metadata reservation types now, we can
completely get rid of the old root->qgroup_meta_rsv, which mostly acts
as current META_PERTRANS reservation type.

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

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f9f512b..df0463e 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1264,9 +1264,6 @@ struct btrfs_root {
        int send_in_progress;
        struct btrfs_subvolume_writers *subv_writers;
        atomic_t will_be_snapshotted;
-
-       /* For qgroup metadata space reserve */
-       atomic64_t qgroup_meta_rsv;
 };
 
 struct btrfs_file_private {

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 38b387a..ad900f8 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1163,7 +1163,6 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
        atomic_set(&root->orphan_inodes, 0);
        refcount_set(&root->refs, 1);
        atomic_set(&root->will_be_snapshotted, 0);
-       atomic64_set(&root->qgroup_meta_rsv, 0);
        root->log_transid = 0;
        root->log_transid_committed = -1;
        root->last_log_commit = 0;

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 8831eaa..a7ca464 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2499,6 +2499,15 @@ out:
        return ret;
 }
 
+/*
+ * Free @num_bytes of reserved space with @type for qgroup.  (Normally level 0
+ * qgroup).
+ *
+ * Will handle all higher level qgroup too.
+ *
+ * NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup.
+ * This special case is only used for META_PERTRANS type.
+ */
 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
                               u64 ref_root, u64 num_bytes,
                               enum btrfs_qgroup_rsv_type type)
@@ -2515,6 +2524,10 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
        if (num_bytes == 0)
                return;
 
+       if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) {
+               WARN(1, "%s: Invalid type to free", __func__);
+               return;
+       }
        spin_lock(&fs_info->qgroup_lock);
 
        quota_root = fs_info->quota_root;
@@ -2525,6 +2538,13 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
        if (!qgroup)
                goto out;
 
+       /*
+        * We're freeing all pertrans rsv, get current value from level 0
+        * qgroup as real num_bytes to free.
+        */
+       if (num_bytes == (u64)-1)
+               num_bytes = qgroup->rsv.values[type];
+
        ulist_reinit(fs_info->qgroup_ulist);
        ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
                        (uintptr_t)qgroup, GFP_ATOMIC);
@@ -3082,24 +3102,21 @@ int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
        ret = qgroup_reserve(root, num_bytes, enforce, type);
        if (ret < 0)
                return ret;
-       atomic64_add(num_bytes, &root->qgroup_meta_rsv);
        return ret;
 }
 
 void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
 {
        struct btrfs_fs_info *fs_info = root->fs_info;
-       u64 reserved;
 
        if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
            !is_fstree(root->objectid))
                return;
 
-       reserved = atomic64_xchg(&root->qgroup_meta_rsv, 0);
-       if (reserved == 0)
-               return;
-       trace_qgroup_meta_reserve(root, -(s64)reserved);
-       btrfs_qgroup_free_refroot(fs_info, root->objectid, reserved,
+       /* TODO: Update trace point to handle such free */
+       trace_qgroup_meta_reserve(root, 0);
+       /* Special value -1 means to free all reserved space */
+       btrfs_qgroup_free_refroot(fs_info, root->objectid, (u64)-1,
                                  BTRFS_QGROUP_RSV_META_PERTRANS);
 }
 
@@ -3113,8 +3130,6 @@ void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
                return;
 
        BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
-       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, type);
 }