From e7c8f5079ed9ec9e6eb1abe3defc5fb4ebfdf1cb Mon Sep 17 00:00:00 2001 From: Theodore Ts'o <tytso@mit.edu> Date: Fri, 3 Apr 2009 01:34:49 -0400 Subject: [PATCH] ext3: Add replace-on-rename hueristics for data=writeback mode In data=writeback mode, start an asynchronous flush when renaming a file on top of an already-existing file. This lowers the probability of data loss in the case of applications that attempt to replace a file via using rename(). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> --- fs/ext3/namei.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c index 4db4ffa1edad2..ab98a66ab8c76 100644 --- a/fs/ext3/namei.c +++ b/fs/ext3/namei.c @@ -2265,7 +2265,7 @@ static int ext3_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 ext3_dir_entry_2 * old_de, * new_de; - int retval; + int retval, flush_file = 0; old_bh = new_bh = dir_bh = NULL; @@ -2401,6 +2401,8 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry, ext3_mark_inode_dirty(handle, new_inode); if (!new_inode->i_nlink) ext3_orphan_add(handle, new_inode); + if (ext3_should_writeback_data(new_inode)) + flush_file = 1; } retval = 0; @@ -2409,6 +2411,8 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry, brelse (old_bh); brelse (new_bh); ext3_journal_stop(handle); + if (retval == 0 && flush_file) + filemap_flush(old_inode->i_mapping); return retval; } -- GitLab