// This function is called when a /dev/osprdX file is finally closed.
// (If the file descriptor was dup2ed, this function is called only when the
// last copy is closed.)
static int osprd_close_last(struct inode *inode, struct file *filp)
{
int ret = 0;
if (filp) {
osprd_info_t *d = file2osprd(filp);
int filp_writable = filp->f_mode & FMODE_WRITE;
// EXERCISE: If the user closes a ramdisk file that holds
// a lock, release the lock. Also wake up blocked processes
// as appropriate.
// Your code here.
if( d->read_lock_count || d->write_lock_count){
/* User closed ramdisk file that holds a lock, release it */
ret = osprd_ioctl(inode, filp, OSPRDIOCRELEASE, 0);
} else {
/* Also wake up blocked processes as appropriate */
if(waitqueue_active(&d->blockq))
wake_up_all(&d->blockq);
d->num_ramdisks_open = 0;
}
// This line avoids compiler warnings; you may remove it.
(void) filp_writable, (void) d;
}
return 0;
}
// This function is called when a /dev/osprdX file is finally closed.
// (If the file descriptor was dup2ed, this function is called only when the
// last copy is closed.)
static int osprd_close_last(struct inode *inode, struct file *filp)
{
if (filp) {
osprd_info_t *d = file2osprd(filp);
//int filp_writable = filp->f_mode & FMODE_WRITE;
// EXERCISE: If the user closes a ramdisk file that holds
// a lock, release the lock. Also wake up blocked processes
// as appropriate.
// Your code here.
osprd_ioctl(inode, filp, OSPRDIOCRELEASE, 0);
}
return 0;
}
