diff mbox

[RFC] ext4: Automatically allocate delay allocated blocks on rename

Message ID 1235451952-2726-7-git-send-email-tytso@mit.edu
State Accepted, archived
Headers show

Commit Message

Theodore Ts'o Feb. 24, 2009, 5:05 a.m. UTC 
When renaming a file such that a link to another inode is overwritten,
force any delay allocated blocks that to be allocated so that if the
filesystem is mounted with data=ordered, the data blocks will be
pushed out to disk along with the journal commit.  Many application
programs expect this, so we do this to avoid zero length files if the
system crashes unexpectedly.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 fs/ext4/namei.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
diff mbox

Patch

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index cb15900..a9a7581 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2357,7 +2357,7 @@  static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct inode *old_inode, *new_inode;
 	struct buffer_head *old_bh, *new_bh, *dir_bh;
 	struct ext4_dir_entry_2 *old_de, *new_de;
-	int retval;
+	int retval, force_da_alloc = 0;
 
 	old_bh = new_bh = dir_bh = NULL;
 
@@ -2497,6 +2497,7 @@  static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 		ext4_mark_inode_dirty(handle, new_inode);
 		if (!new_inode->i_nlink)
 			ext4_orphan_add(handle, new_inode);
+		force_da_alloc = 1;
 	}
 	retval = 0;
 
@@ -2505,6 +2506,8 @@  end_rename:
 	brelse(old_bh);
 	brelse(new_bh);
 	ext4_journal_stop(handle);
+	if (retval == 0 && force_da_alloc)
+		ext4_alloc_da_blocks(old_inode);
 	return retval;
 }