btrfs: qgroup: Refactor btrfs_qgroup_insert_dirty_extent()

Refactor btrfs_qgroup_insert_dirty_extent() function, to two functions:
1. btrfs_qgroup_insert_dirty_extent_nolock()
   Almost the same with original code.
   For delayed_ref usage, which has delayed refs locked.

   Change the return value type to int, since caller never needs the
   pointer, but only needs to know if they need to free the allocated
   memory.

2. btrfs_qgroup_insert_dirty_extent()
   The more encapsulated version.

   Will do the delayed_refs lock, memory allocation, quota enabled check
   and other things.

The original design is to keep exported functions to minimal, but since
more btrfs hacks exposed, like replacing path in balance, we need to
record dirty extents manually, so we have to add such functions.

Also, add comment for both functions, to info developers how to keep
qgroup correct when doing hacks.

Cc: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-and-Tested-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

4 files changed, 71 insertions, 47 deletions

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index d9ddcfc18c91..ac02e041464b 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -541,7 +541,6 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
         struct btrfs_delayed_ref_head *existing;
         struct btrfs_delayed_ref_head *head_ref = NULL;
         struct btrfs_delayed_ref_root *delayed_refs;
-        struct btrfs_qgroup_extent_record *qexisting;
         int count_mod = 1;
         int must_insert_reserved = 0;
 
@@ -606,10 +605,8 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
                 qrecord->num_bytes = num_bytes;
                 qrecord->old_roots = NULL;
 
-                qexisting = btrfs_qgroup_insert_dirty_extent(fs_info,
-                                                             delayed_refs,
-                                                             qrecord);
-                if (qexisting)
+                if(btrfs_qgroup_insert_dirty_extent_nolock(fs_info,
+                                        delayed_refs, qrecord))
                         kfree(qrecord);
         }
 
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d2cc16ff3e21..d10872748c43 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8521,35 +8521,6 @@ reada:
         wc->reada_slot = slot;
 }
 
-/*
- * These may not be seen by the usual inc/dec ref code so we have to
- * add them here.
- */
-static int record_one_subtree_extent(struct btrfs_trans_handle *trans,
-                                     struct btrfs_root *root, u64 bytenr,
-                                     u64 num_bytes)
-{
-        struct btrfs_qgroup_extent_record *qrecord;
-        struct btrfs_delayed_ref_root *delayed_refs;
-
-        qrecord = kmalloc(sizeof(*qrecord), GFP_NOFS);
-        if (!qrecord)
-                return -ENOMEM;
-
-        qrecord->bytenr = bytenr;
-        qrecord->num_bytes = num_bytes;
-        qrecord->old_roots = NULL;
-
-        delayed_refs = &trans->transaction->delayed_refs;
-        spin_lock(&delayed_refs->lock);
-        if (btrfs_qgroup_insert_dirty_extent(trans->fs_info,
-                                             delayed_refs, qrecord))
-                kfree(qrecord);
-        spin_unlock(&delayed_refs->lock);
-
-        return 0;
-}
-
 static int account_leaf_items(struct btrfs_trans_handle *trans,
                               struct btrfs_root *root,
                               struct extent_buffer *eb)
@@ -8583,7 +8554,8 @@ static int account_leaf_items(struct btrfs_trans_handle *trans,
 
                 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
 
-                ret = record_one_subtree_extent(trans, root, bytenr, num_bytes);
+                ret = btrfs_qgroup_insert_dirty_extent(trans, root->fs_info,
+                                bytenr, num_bytes, GFP_NOFS);
                 if (ret)
                         return ret;
         }
@@ -8732,8 +8704,9 @@ walk_down:
                         btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
                         path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
 
-                        ret = record_one_subtree_extent(trans, root, child_bytenr,
-                                                        root->nodesize);
+                        ret = btrfs_qgroup_insert_dirty_extent(trans,
+                                        root->fs_info, child_bytenr,
+                                        root->nodesize, GFP_NOFS);
                         if (ret)
                                 goto out;
                 }
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 13eb6a7a4db1..8db2e29fdcf4 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1453,10 +1453,9 @@ int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
         return ret;
 }
 
-struct btrfs_qgroup_extent_record *
-btrfs_qgroup_insert_dirty_extent(struct btrfs_fs_info *fs_info,
-                                 struct btrfs_delayed_ref_root *delayed_refs,
-                                 struct btrfs_qgroup_extent_record *record)
+int btrfs_qgroup_insert_dirty_extent_nolock(struct btrfs_fs_info *fs_info,
+                                struct btrfs_delayed_ref_root *delayed_refs,
+                                struct btrfs_qgroup_extent_record *record)
 {
         struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
         struct rb_node *parent_node = NULL;
@@ -1475,12 +1474,42 @@ btrfs_qgroup_insert_dirty_extent(struct btrfs_fs_info *fs_info,
                 else if (bytenr > entry->bytenr)
                         p = &(*p)->rb_right;
                 else
-                        return entry;
+                        return 1;
         }
 
         rb_link_node(&record->node, parent_node, p);
         rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
-        return NULL;
+        return 0;
+}
+
+int btrfs_qgroup_insert_dirty_extent(struct btrfs_trans_handle *trans,
+                struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes,
+                gfp_t gfp_flag)
+{
+        struct btrfs_qgroup_extent_record *record;
+        struct btrfs_delayed_ref_root *delayed_refs;
+        int ret;
+
+        if (!fs_info->quota_enabled || bytenr == 0 || num_bytes == 0)
+                return 0;
+        if (WARN_ON(trans == NULL))
+                return -EINVAL;
+        record = kmalloc(sizeof(*record), gfp_flag);
+        if (!record)
+                return -ENOMEM;
+
+        delayed_refs = &trans->transaction->delayed_refs;
+        record->bytenr = bytenr;
+        record->num_bytes = num_bytes;
+        record->old_roots = NULL;
+
+        spin_lock(&delayed_refs->lock);
+        ret = btrfs_qgroup_insert_dirty_extent_nolock(fs_info, delayed_refs,
+                                                      record);
+        spin_unlock(&delayed_refs->lock);
+        if (ret > 0)
+                kfree(record);
+        return 0;
 }
 
 #define UPDATE_NEW      0
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index af3e5578cad7..1bc64c864b62 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -64,10 +64,35 @@ void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
 struct btrfs_delayed_extent_op;
 int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
                                          struct btrfs_fs_info *fs_info);
-struct btrfs_qgroup_extent_record *
-btrfs_qgroup_insert_dirty_extent(struct btrfs_fs_info *fs_info,
-                                 struct btrfs_delayed_ref_root *delayed_refs,
-                                 struct btrfs_qgroup_extent_record *record);
+/*
+ * Insert one dirty extent record into @delayed_refs, informing qgroup to
+ * account that extent at commit trans time.
+ *
+ * No lock version, caller must acquire delayed ref lock and allocate memory.
+ *
+ * Return 0 for success insert
+ * Return >0 for existing record, caller can free @record safely.
+ * Error is not possible
+ */
+int btrfs_qgroup_insert_dirty_extent_nolock(
+                struct btrfs_fs_info *fs_info,
+                struct btrfs_delayed_ref_root *delayed_refs,
+                struct btrfs_qgroup_extent_record *record);
+
+/*
+ * Insert one dirty extent record into @delayed_refs, informing qgroup to
+ * account that extent at commit trans time.
+ *
+ * Better encapsulated version.
+ *
+ * Return 0 if the operation is done.
+ * Return <0 for error, like memory allocation failure or invalid parameter
+ * (NULL trans)
+ */
+int btrfs_qgroup_insert_dirty_extent(struct btrfs_trans_handle *trans,
+                struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes,
+                gfp_t gfp_flag);
+
 int
 btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
                             struct btrfs_fs_info *fs_info,