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authorTheodore Ts'o <tytso@mit.edu>2009-06-02 08:07:47 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 09:40:24 -0700
commit23ae18d466ab83fc4b9829b331ee82899bccdeff (patch)
tree6edfb65b7c15d9e63b1c4cc94b8b04458a52bd82
parent9dc84851a33e1dda83cfecfee130e26c92c8a3bb (diff)
ext4: Automatically allocate delay allocated blocks on close
(cherry picked from commit 7d8f9f7d150dded7b68e61ca6403a1f166fb4edf) 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/ext4.h1
-rw-r--r--fs/ext4/file.c4
-rw-r--r--fs/ext4/inode.c3
3 files changed, 8 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f5552d7c661e..83f685da8bea 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -279,6 +279,7 @@ static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
#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 f731cb545a03..06df8272c639 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 76969f747452..afb3ea2d1cf3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3880,6 +3880,9 @@ void ext4_truncate(struct inode *inode)
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;