/* Call both cr_permision() and cr_dentry_open().
*/
struct file *
cr_dentry_open_perm(struct path *path, int flags)
{
struct file *filp;
int acc_mask = ("\004\002\006\006"[flags&O_ACCMODE]); /* ACC_MODE(open_to_namei_flags()) */
int err;
err = cr_permission(path->dentry->d_inode, acc_mask);
filp = ERR_PTR(err);
if (!IS_ERR(filp)) {
filp = cr_dentry_open(path, flags);
}
return filp;
}
/* Call permision() and dentry_open().
* Caller should dget() and mntget() just as they would for dentry_open(). */
struct file *
cr_dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
{
struct file *filp;
int acc_mask = ("\000\004\002\006"[(flags)&O_ACCMODE]); /* ICK (from linux/fs/namei.c) */
int err;
err = cr_permission(dentry->d_inode, acc_mask, NULL);
filp = ERR_PTR(err);
#if HAVE_TASK_CRED
if (!IS_ERR(filp)) filp = dentry_open(dentry, mnt, flags, cr_current_cred());
#else
if (!IS_ERR(filp)) filp = dentry_open(dentry, mnt, flags);
#endif
return filp;
}
// XXX: need comment here
// XXX: currently only check perms to create here.
// XXX: other checks needed?
static int do_init_dir(cr_location_t *loc, struct file *dirp)
{
int result = 0;
result = cr_permission(dirp->f_dentry->d_inode,
(loc->is_write ? MAY_WRITE : MAY_READ) | MAY_EXEC, NULL);
if (!result) {
loc->fs = copy_fs_struct(current->fs);
if (loc->fs) {
// replace the pwd with that of 'dirp'
cr_set_pwd_file(loc->fs, dirp);
} else {
result = -EINVAL;
}
}
// Error and normal paths exit here
fput(dirp); // We don't hold the filp for a directory
return result;
}
