Btrfs: hooks to reserve qgroup space

Like block reserves, reserve a small piece of space on each
transaction start and for delalloc. These are the hooks that
can actually return EDQUOT to the user.
The amount of space reserved is tracked in the transaction
handle.

Signed-off-by: Arne Jansen <sensille@gmx.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c08337a83ace..2ce16f97730a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4565,6 +4565,13 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
         csum_bytes = BTRFS_I(inode)->csum_bytes;
         spin_unlock(&BTRFS_I(inode)->lock);
 
+        if (root->fs_info->quota_enabled) {
+                ret = btrfs_qgroup_reserve(root, num_bytes +
+                                           nr_extents * root->leafsize);
+                if (ret)
+                        return ret;
+        }
+
         ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush);
         if (ret) {
                 u64 to_free = 0;
@@ -4643,6 +4650,11 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes)
 
         trace_btrfs_space_reservation(root->fs_info, "delalloc",
                                       btrfs_ino(inode), to_free, 0);
+        if (root->fs_info->quota_enabled) {
+                btrfs_qgroup_free(root, num_bytes +
+                                        dropped * root->leafsize);
+        }
+
         btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv,
                                 to_free);
 }