static ssize_t unionfs_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
ssize_t err;
struct file *lower_file;
struct dentry *dentry = file->f_path.dentry;
struct dentry *parent;
unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
parent = unionfs_lock_parent(dentry, UNIONFS_DMUTEX_PARENT);
unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
err = unionfs_file_revalidate(file, parent, false);
if (unlikely(err))
goto out;
lower_file = unionfs_lower_file(file);
err = vfs_splice_to(lower_file, ppos, pipe, len, flags);
/* update our inode atime upon a successful lower splice-read */
if (err >= 0) {
fsstack_copy_attr_atime(dentry->d_inode,
lower_file->f_path.dentry->d_inode);
unionfs_check_file(file);
}
out:
unionfs_unlock_dentry(dentry);
unionfs_unlock_parent(dentry, parent);
unionfs_read_unlock(dentry->d_sb);
return err;
}
long do_vfsub_splice_to(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
long err;
LKTRTrace("%.*s, pos %lld, len %zu, 0x%x\n",
AuDLNPair(in->f_dentry), *ppos, len, flags);
lockdep_off();
err = vfs_splice_to(in, ppos, pipe, len, flags);
lockdep_on();
if (err >= 0)
au_update_fuse_h_inode(in->f_vfsmnt, in->f_dentry); /*ignore*/
return err;
}
