btrfs: delayed-inode: Remove wrong qgroup meta reservation calls

Commit 4f5427ccce5d ("btrfs: delayed-inode: Use new qgroup meta rsv for
delayed inode and item") merged into mainline was not latest version
submitted to the mail list in Dec 2017.

Which lacks the following fixes:

1) Remove btrfs_qgroup_convert_reserved_meta() call in
   btrfs_delayed_item_release_metadata()
2) Remove btrfs_qgroup_reserve_meta_prealloc() call in
   btrfs_delayed_inode_reserve_metadata()

Those fixes will resolve unexpected EDQUOT problems.

Fixes: 4f5427ccce5d ("btrfs: delayed-inode: Use new qgroup meta rsv for delayed inode and item")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 06ec8ab6d9ba..a8d492dbd3e7 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -556,6 +556,12 @@ static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
         dst_rsv = &fs_info->delayed_block_rsv;
 
         num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
+
+        /*
+         * Here we migrate space rsv from transaction rsv, since have already
+         * reserved space when starting a transaction.  So no need to reserve
+         * qgroup space here.
+         */
         ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
         if (!ret) {
                 trace_btrfs_space_reservation(fs_info, "delayed_item",
@@ -577,7 +583,10 @@ static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
                 return;
 
         rsv = &fs_info->delayed_block_rsv;
-        btrfs_qgroup_convert_reserved_meta(root, item->bytes_reserved);
+        /*
+         * Check btrfs_delayed_item_reserve_metadata() to see why we don't need
+         * to release/reserve qgroup space.
+         */
         trace_btrfs_space_reservation(fs_info, "delayed_item",
                                       item->key.objectid, item->bytes_reserved,
                                       0);
@@ -602,9 +611,6 @@ static int btrfs_delayed_inode_reserve_metadata(
 
         num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
 
-        ret = btrfs_qgroup_reserve_meta_prealloc(root, num_bytes, true);
-        if (ret < 0)
-                return ret;
         /*
          * btrfs_dirty_inode will update the inode under btrfs_join_transaction
          * which doesn't reserve space for speed.  This is a problem since we
@@ -616,6 +622,10 @@ static int btrfs_delayed_inode_reserve_metadata(
          */
         if (!src_rsv || (!trans->bytes_reserved &&
                          src_rsv->type != BTRFS_BLOCK_RSV_DELALLOC)) {
+                ret = btrfs_qgroup_reserve_meta_prealloc(root,
+                                fs_info->nodesize, true);
+                if (ret < 0)
+                        return ret;
                 ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,
                                           BTRFS_RESERVE_NO_FLUSH);
                 /*
@@ -634,6 +644,8 @@ static int btrfs_delayed_inode_reserve_metadata(
                                                       "delayed_inode",
                                                       btrfs_ino(inode),
                                                       num_bytes, 1);
+                } else {
+                        btrfs_qgroup_free_meta_prealloc(root, fs_info->nodesize);
                 }
                 return ret;
         }