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ocfs2_dlmfs: Don't honor truncate. The size of a dlmfs file is LVB_LEN

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We want folks using dlmfs to be able to use the LVB in places other than
just write(2)/read(2).  By ignoring truncate requests, we allow 'echo
"contents" > /dlm/space/lockname' to work.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker 2010-02-09 17:52:13 -08:00
parent 553b5eb91a
commit e8fce482f3
1 changed files with 18 additions and 0 deletions
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18
fs/ocfs2/dlmfs/dlmfs.c
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@ -220,6 +220,23 @@ static int dlmfs_file_release(struct inode *inode,
return 0;
}
/*
* We do ->setattr() just to override size changes. Our size is the size
* of the LVB and nothing else.
*/
static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr)
{
int error;
struct inode *inode = dentry->d_inode;
attr->ia_valid &= ~ATTR_SIZE;
error = inode_change_ok(inode, attr);
if (!error)
error = inode_setattr(inode, attr);
return error;
}
static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
{
int event = 0;
@ -634,6 +651,7 @@ static const struct super_operations dlmfs_ops = {
static const struct inode_operations dlmfs_file_inode_operations = {
.getattr = simple_getattr,
.setattr = dlmfs_file_setattr,
};
static int dlmfs_get_sb(struct file_system_type *fs_type,