Btrfs: fix data space leak fix

[safe/jmp/linux-2.6] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3cc5677..3a6f953 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4909,10 +4909,21 @@ again:
                goto again;
        }
 
+       /*
+        * XXX - page_mkwrite gets called every time the page is dirtied, even
+        * if it was already dirty, so for space accounting reasons we need to
+        * clear any delalloc bits for the range we are fixing to save.  There
+        * is probably a better way to do this, but for now keep consistent with
+        * prepare_pages in the normal write path.
+        */
+       clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
+                         EXTENT_DIRTY | EXTENT_DELALLOC, GFP_NOFS);
+
        ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
        if (ret) {
                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
                ret = VM_FAULT_SIGBUS;
+               btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
                goto out_unlock;
        }
        ret = 0;