btrfs: qgroup: Record possible quota-related extent for qgroup.

Add hook in add_delayed_ref_head() to record quota-related extent record
into delayed_ref_root->dirty_extent_record rb-tree for later qgroup
accounting.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 43 insertions, 7 deletions

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index fc9563d42693..fd64fd0f011a 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -22,6 +22,7 @@
 #include "ctree.h"
 #include "delayed-ref.h"
 #include "transaction.h"
+#include "qgroup.h"
 
 struct kmem_cache *btrfs_delayed_ref_head_cachep;
 struct kmem_cache *btrfs_delayed_tree_ref_cachep;
@@ -420,12 +421,14 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
 static noinline struct btrfs_delayed_ref_head *
 add_delayed_ref_head(struct btrfs_fs_info *fs_info,
                      struct btrfs_trans_handle *trans,
-                     struct btrfs_delayed_ref_node *ref, u64 bytenr,
-                     u64 num_bytes, int action, int is_data)
+                     struct btrfs_delayed_ref_node *ref,
+                     struct btrfs_qgroup_extent_record *qrecord,
+                     u64 bytenr, u64 num_bytes, int action, int is_data)
 {
         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;
 
@@ -474,6 +477,18 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
         head_ref->processing = 0;
         head_ref->total_ref_mod = count_mod;
 
+        /* Record qgroup extent info if provided */
+        if (qrecord) {
+                qrecord->bytenr = bytenr;
+                qrecord->num_bytes = num_bytes;
+                qrecord->old_roots = NULL;
+
+                qexisting = btrfs_qgroup_insert_dirty_extent(delayed_refs,
+                                                             qrecord);
+                if (qexisting)
+                        kfree(qrecord);
+        }
+
         spin_lock_init(&head_ref->lock);
         mutex_init(&head_ref->mutex);
 
@@ -624,6 +639,7 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
         struct btrfs_delayed_tree_ref *ref;
         struct btrfs_delayed_ref_head *head_ref;
         struct btrfs_delayed_ref_root *delayed_refs;
+        struct btrfs_qgroup_extent_record *record = NULL;
 
         if (!is_fstree(ref_root) || !fs_info->quota_enabled)
                 no_quota = 0;
@@ -639,6 +655,15 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
                 return -ENOMEM;
         }
 
+        if (fs_info->quota_enabled && is_fstree(ref_root)) {
+                record = kmalloc(sizeof(*record), GFP_NOFS);
+                if (!record) {
+                        kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);
+                        kmem_cache_free(btrfs_delayed_ref_head_cachep, ref);
+                        return -ENOMEM;
+                }
+        }
+
         head_ref->extent_op = extent_op;
 
         delayed_refs = &trans->transaction->delayed_refs;
@@ -648,7 +673,7 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
          * insert both the head node and the new ref without dropping
          * the spin lock
          */
-        head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node,
+        head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
                                         bytenr, num_bytes, action, 0);
 
         add_delayed_tree_ref(fs_info, trans, head_ref, &ref->node, bytenr,
@@ -673,6 +698,7 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
         struct btrfs_delayed_data_ref *ref;
         struct btrfs_delayed_ref_head *head_ref;
         struct btrfs_delayed_ref_root *delayed_refs;
+        struct btrfs_qgroup_extent_record *record = NULL;
 
         if (!is_fstree(ref_root) || !fs_info->quota_enabled)
                 no_quota = 0;
@@ -688,6 +714,16 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
                 return -ENOMEM;
         }
 
+        if (fs_info->quota_enabled && is_fstree(ref_root)) {
+                record = kmalloc(sizeof(*record), GFP_NOFS);
+                if (!record) {
+                        kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
+                        kmem_cache_free(btrfs_delayed_ref_head_cachep,
+                                        head_ref);
+                        return -ENOMEM;
+                }
+        }
+
         head_ref->extent_op = extent_op;
 
         delayed_refs = &trans->transaction->delayed_refs;
@@ -697,7 +733,7 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
          * insert both the head node and the new ref without dropping
          * the spin lock
          */
-        head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node,
+        head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
                                         bytenr, num_bytes, action, 1);
 
         add_delayed_data_ref(fs_info, trans, head_ref, &ref->node, bytenr,
@@ -725,9 +761,9 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
         delayed_refs = &trans->transaction->delayed_refs;
         spin_lock(&delayed_refs->lock);
 
-        add_delayed_ref_head(fs_info, trans, &head_ref->node, bytenr,
-                                   num_bytes, BTRFS_UPDATE_DELAYED_HEAD,
-                                   extent_op->is_data);
+        add_delayed_ref_head(fs_info, trans, &head_ref->node, NULL, bytenr,
+                             num_bytes, BTRFS_UPDATE_DELAYED_HEAD,
+                             extent_op->is_data);
 
         spin_unlock(&delayed_refs->lock);
         return 0;