ext4: Automatically allocate delay allocated blocks on close
When closing a file that had been previously truncated, 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>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b0ea70c..1b0c173 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -270,6 +270,7 @@
#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
+#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
/* Used to pass group descriptor data when online resize is done */
struct ext4_new_group_input {
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index f731cb5..06df827 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -33,6 +33,10 @@
*/
static int ext4_release_file(struct inode *inode, struct file *filp)
{
+ if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
+ ext4_alloc_da_blocks(inode);
+ EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
+ }
/* if we are the last writer on the inode, drop the block reservation */
if ((filp->f_mode & FMODE_WRITE) &&
(atomic_read(&inode->i_writecount) == 1))
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 8dd3d5d..80ed6dc 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3901,6 +3901,9 @@
if (!ext4_can_truncate(inode))
return;
+ if (inode->i_size == 0)
+ ei->i_state |= EXT4_STATE_DA_ALLOC_CLOSE;
+
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
ext4_ext_truncate(inode);
return;