static struct file *vperfctr_get_filp(void)
{
struct file *filp;
struct inode *inode;
struct dentry *dentry;
filp = get_empty_filp();
if (!filp)
goto out;
inode = vperfctr_get_inode();
if (!inode)
goto out_filp;
dentry = vperfctr_d_alloc_root(inode);
if (!dentry)
goto out_inode;
filp->f_vfsmnt = mntget(vperfctr_mnt);
filp->f_dentry = dentry;
filp->f_mapping = dentry->d_inode->i_mapping;
filp->f_pos = 0;
filp->f_flags = 0;
filp->f_op = &vperfctr_file_ops; /* fops_get() if MODULE */
filp->f_mode = FMODE_READ;
filp->f_version = 0;
return filp;
out_inode:
iput(inode);
out_filp:
put_filp(filp); /* doesn't run ->release() like fput() does */
out:
return NULL;
}
static struct file *vperfctr_get_filp(void)
{
struct file *filp;
struct inode *inode;
struct dentry *dentry;
inode = vperfctr_get_inode();
if (!inode)
goto out;
dentry = vperfctr_d_alloc_root(inode);
if (!dentry)
goto out_inode;
/*
* Create the filp _after_ the inode and dentry, to avoid
* needing access to put_filp(), which is no longer exported
* starting with kernel 2.6.10-rc1. fput() is available but
* doesn't work on incomplete files. We now need access to
* dput() instead, but that's Ok.
*/
filp = get_empty_filp();
if (!filp)
goto out_dentry;
filp_vfsmnt(filp) = mntget(vperfctr_mnt);
filp_dentry(filp) = dentry;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,2)
filp->f_mapping = dentry->d_inode->i_mapping;
#endif
filp->f_pos = 0;
filp->f_flags = 0;
filp->f_op = fops_get(&vperfctr_file_ops); /* fops_get() for MODULE */
filp->f_mode = FMODE_READ;
filp->f_version = 0;
return filp;
out_dentry:
dput(dentry);
goto out; /* dput() also does iput() */
out_inode:
iput(inode);
out:
return NULL;
}
