Fixes for loopback files in btrfs

Signed-off-by: Chris Mason <chris.mason@oracle.com>

2 files changed, 14 insertions, 2 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index a280b9562221..62fcd79d8ab3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -861,6 +861,7 @@ struct file_operations btrfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .aio_read       = generic_file_aio_read,
+        .splice_read    = generic_file_splice_read,
         .write          = btrfs_file_write,
         .mmap           = btrfs_file_mmap,
         .open           = generic_file_open,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 41b0c7de7a59..e535c50e669b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1893,8 +1893,19 @@ static void btrfs_truncate(struct inode *inode)
 int btrfs_commit_write(struct file *file, struct page *page,
                        unsigned from, unsigned to)
 {
-        return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree,
-                                   page->mapping->host, page, from, to);
+        loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+        struct inode *inode = page->mapping->host;
+
+        btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
+
+        set_page_extent_mapped(page);
+        set_page_dirty(page);
+
+        if (pos > inode->i_size) {
+                i_size_write(inode, pos);
+                mark_inode_dirty(inode);
+        }
+        return 0;
 }
 
 static int create_subvol(struct btrfs_root *root, char *name, int namelen)