Btrfs: Add data=ordered support

This forces file data extents down the disk along with the metadata that
references them.  The current implementation is fairly simple, and just
writes out all of the dirty pages in an inode before the commit.

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

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 94c93373cb7d..0a5f4defe59b 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -34,6 +34,7 @@
 #include "disk-io.h"
 #include "transaction.h"
 #include "btrfs_inode.h"
+#include "ordered-data.h"
 #include "ioctl.h"
 #include "print-tree.h"
 
@@ -329,6 +330,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
                 root->fs_info->delalloc_bytes += (end_of_last_block + 1 -
                                           start_pos) - existing_delalloc;
                 spin_unlock(&root->fs_info->delalloc_lock);
+                btrfs_add_ordered_inode(inode);
         } else {
                 u64 aligned_end;
                 /* step one, delete the existing extents in this range */
@@ -724,8 +726,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 
         pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
 
-        down_read(&BTRFS_I(inode)->root->snap_sem);
-
         mutex_lock(&inode->i_mutex);
         first_index = pos >> PAGE_CACHE_SHIFT;
         last_index = (pos + count) >> PAGE_CACHE_SHIFT;
@@ -804,7 +804,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
         }
 out:
         mutex_unlock(&inode->i_mutex);
-        up_read(&BTRFS_I(inode)->root->snap_sem);
 
 out_nolock:
         kfree(pages);