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ext4: Automatically allocate delay allocated blocks on close

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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>
This commit is contained in:
Theodore Ts'o
2009-02-24 08:21:14 -05:00
parent ccd2506bd4
commit 7d8f9f7d15
3 changed files with 8 additions and 0 deletions
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4
fs/ext4/file.c
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@@ -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))