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ext4: Automatically allocate delay allocated blocks on rename 

When renaming a file such that a link to another inode is overwritten,
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 2009-02-23 23:05:27 -05:00
parent 7d8f9f7d15
commit 8750c6d5fc
1 changed files with 4 additions and 1 deletions
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5
fs/ext4/namei.c
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@ -2357,7 +2357,7 @@ static int ext4_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 ext4_dir_entry_2 *old_de, *new_de;
int retval;
int retval, force_da_alloc = 0;
old_bh = new_bh = dir_bh = NULL;
@ -2497,6 +2497,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
ext4_mark_inode_dirty(handle, new_inode);
if (!new_inode->i_nlink)
ext4_orphan_add(handle, new_inode);
force_da_alloc = 1;
}
retval = 0;
@ -2505,6 +2506,8 @@ end_rename:
brelse(old_bh);
brelse(new_bh);
ext4_journal_stop(handle);
if (retval == 0 && force_da_alloc)
ext4_alloc_da_blocks(old_inode);
return retval;
}