Btrfs: Shrink delay allocated space in a synchronized

[karo-tx-linux.git] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2bfdc641d4e3ba046f3afd89400f362ec959e46b..d53cad1afe26a8e234e77c76e3a6bef2b8d0b7b0 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5611,6 +5611,38 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
        return 0;
 }
 
+int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput)
+{
+       struct btrfs_inode *binode;
+       struct inode *inode = NULL;
+
+       spin_lock(&root->fs_info->delalloc_lock);
+       while (!list_empty(&root->fs_info->delalloc_inodes)) {
+               binode = list_entry(root->fs_info->delalloc_inodes.next,
+                                   struct btrfs_inode, delalloc_inodes);
+               inode = igrab(&binode->vfs_inode);
+               if (inode) {
+                       list_move_tail(&binode->delalloc_inodes,
+                                      &root->fs_info->delalloc_inodes);
+                       break;
+               }
+
+               list_del_init(&binode->delalloc_inodes);
+               cond_resched_lock(&root->fs_info->delalloc_lock);
+       }
+       spin_unlock(&root->fs_info->delalloc_lock);
+
+       if (inode) {
+               write_inode_now(inode, 0);
+               if (delay_iput)
+                       btrfs_add_delayed_iput(inode);
+               else
+                       iput(inode);
+               return 1;
+       }
+       return 0;
+}
+
 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                         const char *symname)
 {