Btrfs: pass locked_page into extent_clear_unlock_delalloc if theres an error

While doing my enospc work I got a transaction abortion that resulted in a
panic when we tried to unlock_page() an already unlocked page.  This is
because we aren't calling extent_clear_unlock_delalloc with the locked page
so it was unlocking all the pages in the range.  This is wrong since
__extent_writepage expects to have the page locked still unless we return
*page_started as 1.  This should keep us from panicing.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 92df0a5..ccd6355 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -830,7 +830,7 @@ static noinline int cow_file_range(struct inode *inode,
        if (IS_ERR(trans)) {
                extent_clear_unlock_delalloc(inode,
                             &BTRFS_I(inode)->io_tree,
-                            start, end, NULL,
+                            start, end, locked_page,
                             EXTENT_CLEAR_UNLOCK_PAGE |
                             EXTENT_CLEAR_UNLOCK |
                             EXTENT_CLEAR_DELALLOC |
@@ -963,7 +963,7 @@ out:
 out_unlock:
        extent_clear_unlock_delalloc(inode,
                     &BTRFS_I(inode)->io_tree,
-                    start, end, NULL,
+                    start, end, locked_page,
                     EXTENT_CLEAR_UNLOCK_PAGE |
                     EXTENT_CLEAR_UNLOCK |
                     EXTENT_CLEAR_DELALLOC |