text: #include <linux/in.h>
  
  #include "super.h"
  #include "mds_client.h"
  #include <linux/ceph/ceph_debug.h>
  
  #include "ioctl.h"
  
  /*
   * ioctls
   */
  
  /*
   * get and set the file layout
   */
  static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
  {
  	struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  	struct ceph_ioctl_layout l;
  	int err;
  
  	err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  	if (!err) {
  		l.stripe_unit = ceph_file_layout_su(ci->i_layout);
  		l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  		l.object_size = ceph_file_layout_object_size(ci->i_layout);
  		l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  		l.preferred_osd =
  			(s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
  		if (copy_to_user(arg, &l, sizeof(l)))
  			return -EFAULT;
  	}
  
  	return err;
  }
  
  static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  {
  	struct inode *inode = file->f_dentry->d_inode;
  	struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
  	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  	struct ceph_mds_request *req;
  	struct ceph_ioctl_layout l;
  	int err, i;
  
  	/* copy and validate */
  	if (copy_from_user(&l, arg, sizeof(l)))
  		return -EFAULT;
  
  	if ((l.object_size & ~PAGE_MASK) ||
  	    (l.stripe_unit & ~PAGE_MASK) ||
  	    !l.stripe_unit ||
  	    (l.object_size &&
  	     (unsigned)l.object_size % (unsigned)l.stripe_unit))
  		return -EINVAL;
  
  	/* make sure it's a valid data pool */
  	if (l.data_pool > 0) {
  		mutex_lock(&mdsc->mutex);
  		err = -EINVAL;
  		for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  			if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  				err = 0;
  				break;
  			}
  		mutex_unlock(&mdsc->mutex);
  		if (err)
  			return err;
  	}
  
  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  				       USE_AUTH_MDS);
  	if (IS_ERR(req))
  		return PTR_ERR(req);
  	req->r_inode = inode;
  	ihold(inode);
  	req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
  
  	req->r_args.setlayout.layout.fl_stripe_unit =
  		cpu_to_le32(l.stripe_unit);
  	req->r_args.setlayout.layout.fl_stripe_count =
  		cpu_to_le32(l.stripe_count);
  	req->r_args.setlayout.layout.fl_object_size =
  		cpu_to_le32(l.object_size);
  	req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
  	req->r_args.setlayout.layout.fl_pg_preferred =
  		cpu_to_le32(l.preferred_osd);
  
  	err = ceph_mdsc_do_request(mdsc, parent_inode, req);
  	ceph_mdsc_put_request(req);
  	return err;
  }
  
  /*
   * Set a layout policy on a directory inode. All items in the tree
   * rooted at this inode will inherit this layout on creation,
   * (It doesn't apply retroactively )
   * unless a subdirectory has its own layout policy.
   */
  static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
  {
  	struct inode *inode = file->f_dentry->d_inode;
  	struct ceph_mds_request *req;
  	struct ceph_ioctl_layout l;
  	int err, i;
  	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  
  	/* copy and validate */
  	if (copy_from_user(&l, arg, sizeof(l)))
  		return -EFAULT;
  
  	if ((l.object_size & ~PAGE_MASK) ||
  	    (l.stripe_unit & ~PAGE_MASK) ||
  	    !l.stripe_unit ||
  	    (l.object_size &&
  	        (unsigned)l.object_size % (unsigned)l.stripe_unit))
  		return -EINVAL;
  
  	/* make sure it's a valid data pool */
  	if (l.data_pool > 0) {
  		mutex_lock(&mdsc->mutex);
  		err = -EINVAL;
  		for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  			if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  				err = 0;
  				break;
  			}
  		mutex_unlock(&mdsc->mutex);
  		if (err)
  			return err;
  	}
  
  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
  				       USE_AUTH_MDS);
  
  	if (IS_ERR(req))
  		return PTR_ERR(req);
  	req->r_inode = inode;
  	ihold(inode);
  
  	req->r_args.setlayout.layout.fl_stripe_unit =
  			cpu_to_le32(l.stripe_unit);
  	req->r_args.setlayout.layout.fl_stripe_count =
  			cpu_to_le32(l.stripe_count);
  	req->r_args.setlayout.layout.fl_object_size =
  			cpu_to_le32(l.object_size);
  	req->r_args.setlayout.layout.fl_pg_pool =
  			cpu_to_le32(l.data_pool);
  	req->r_args.setlayout.layout.fl_pg_preferred =
  			cpu_to_le32(l.preferred_osd);
  
  	err = ceph_mdsc_do_request(mdsc, inode, req);
  	ceph_mdsc_put_request(req);
  	return err;
  }
  
  /*
   * Return object name, size/offset information, and location (OSD
   * number, network address) for a given file offset.
   */
  static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
  {
  	struct ceph_ioctl_dataloc dl;
  	struct inode *inode = file->f_dentry->d_inode;
  	struct ceph_inode_info *ci = ceph_inode(inode);
  	struct ceph_osd_client *osdc =
  		&ceph_sb_to_client(inode->i_sb)->client->osdc;
  	u64 len = 1, olen;
  	u64 tmp;
  	struct ceph_object_layout ol;
  	struct ceph_pg pgid;
  
  	/* copy and validate */
  	if (copy_from_user(&dl, arg, sizeof(dl)))
  		return -EFAULT;
  
  	down_read(&osdc->map_sem);
  	ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
  				      &dl.object_no, &dl.object_offset, &olen);
  	dl.file_offset -= dl.object_offset;
  	dl.object_size = ceph_file_layout_object_size(ci->i_layout);
  	dl.block_size = ceph_file_layout_su(ci->i_layout);
  
  	/* block_offset = object_offset % block_size */
  	tmp = dl.object_offset;
  	dl.block_offset = do_div(tmp, dl.block_size);
  
  	snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
  		 ceph_ino(inode), dl.object_no);
  	ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
  				osdc->osdmap);
  
  	pgid = ol.ol_pgid;
  	dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
  	if (dl.osd >= 0) {
  		struct ceph_entity_addr *a =
  			ceph_osd_addr(osdc->osdmap, dl.osd);
  		if (a)
  			memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
  	} else {
  		memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
  	}
  	up_read(&osdc->map_sem);
  
  	/* send result back to user */
  	if (copy_to_user(arg, &dl, sizeof(dl)))
  		return -EFAULT;
  
  	return 0;
  }
  
  static long ceph_ioctl_lazyio(struct file *file)
  {
  	struct ceph_file_info *fi = file->private_data;
  	struct inode *inode = file->f_dentry->d_inode;
  	struct ceph_inode_info *ci = ceph_inode(inode);
  
  	if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
  		spin_lock(&inode->i_lock);
  		ci->i_nr_by_mode[fi->fmode]--;
  		fi->fmode |= CEPH_FILE_MODE_LAZY;
  		ci->i_nr_by_mode[fi->fmode]++;
  		spin_unlock(&inode->i_lock);
  		dout("ioctl_layzio: file %p marked lazy\n", file);
  
  		ceph_check_caps(ci, 0, NULL);
  	} else {
  		dout("ioctl_layzio: file %p already lazy\n", file);
  	}
  	return 0;
  }
  
  long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
  	switch (cmd) {
  	case CEPH_IOC_GET_LAYOUT:
  		return ceph_ioctl_get_layout(file, (void __user *)arg);
  
  	case CEPH_IOC_SET_LAYOUT:
  		return ceph_ioctl_set_layout(file, (void __user *)arg);
  
  	case CEPH_IOC_SET_LAYOUT_POLICY:
  		return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
  
  	case CEPH_IOC_GET_DATALOC:
  		return ceph_ioctl_get_dataloc(file, (void __user *)arg);
  
  	case CEPH_IOC_LAZYIO:
  		return ceph_ioctl_lazyio(file);
  	}
  
  	return -ENOTTY;
  }
  