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authorTheodore Ts'o <tytso@mit.edu>2009-04-03 09:34:49 +0400
committerTheodore Ts'o <tytso@mit.edu>2009-04-03 09:34:49 +0400
commite7c8f5079ed9ec9e6eb1abe3defc5fb4ebfdf1cb (patch)
treefd0191b45890e37b5e20a2d7e200d34a6432eb7e /fs
parentf7ab34ea723ed304b19698efca85d6f40cecd99b (diff)
downloadlinux-e7c8f5079ed9ec9e6eb1abe3defc5fb4ebfdf1cb.tar.xz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext3/namei.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index 4db4ffa1edad..ab98a66ab8c7 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 @@ end_rename:
brelse (old_bh);
brelse (new_bh);
ext3_journal_stop(handle);
+ if (retval == 0 && flush_file)
+ filemap_flush(old_inode->i_mapping);
return retval;
}