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authorTheodore Ts'o <tytso@mit.edu>2009-02-24 08:21:14 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-02-24 08:21:14 -0500
commit7d8f9f7d150dded7b68e61ca6403a1f166fb4edf (patch)
tree79572041ae1b5737bc8d75037ff86903469430eb /fs/ext4
parentccd2506bd43113659aa904d5bea5d1300605e2a6 (diff)
downloadlinux-7d8f9f7d150dded7b68e61ca6403a1f166fb4edf.tar.bz2
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>
Diffstat (limited to 'fs/ext4')
-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 b0ea70cc94db..1b0c17364631 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -270,6 +270,7 @@ 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 8dd3d5de5861..80ed6dc9c9d2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3901,6 +3901,9 @@ 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;