text: #include <linux/ceph/ceph_debug.h>
  #include <linux/in.h>
  
  #include "super.h"
  #include "mds_client.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_inode(file));
  	struct ceph_ioctl_layout l;
  	int err;
  
  	err = ceph_do_getattr(file_inode(file), 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)-1;
  		if (copy_to_user(arg, &l, sizeof(l)))
  			return -EFAULT;
  	}
  
  	return err;
  }
  
  static long __validate_layout(struct ceph_mds_client *mdsc,
  			      struct ceph_ioctl_layout *l)
  {
  	int i, err;
  
  	/* validate striping parameters */
  	if ((l->object_size & ~PAGE_MASK) ||
  	    (l->stripe_unit & ~PAGE_MASK) ||
  	    (l->stripe_unit != 0 &&
  	     ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
  		return -EINVAL;
  
  	/* make sure it's a valid data pool */
  	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;
  
  	return 0;
  }
  
  static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  {
  	struct inode *inode = file_inode(file);
  	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  	struct ceph_mds_request *req;
  	struct ceph_ioctl_layout l;
  	struct ceph_inode_info *ci = ceph_inode(file_inode(file));
  	struct ceph_ioctl_layout nl;
  	int err;
  
  	if (copy_from_user(&l, arg, sizeof(l)))
  		return -EFAULT;
  
  	/* validate changed params against current layout */
  	err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
  	if (err)
  		return err;
  
  	memset(&nl, 0, sizeof(nl));
  	if (l.stripe_count)
  		nl.stripe_count = l.stripe_count;
  	else
  		nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  	if (l.stripe_unit)
  		nl.stripe_unit = l.stripe_unit;
  	else
  		nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  	if (l.object_size)
  		nl.object_size = l.object_size;
  	else
  		nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  	if (l.data_pool)
  		nl.data_pool = l.data_pool;
  	else
  		nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
  
  	/* this is obsolete, and always -1 */
  	nl.preferred_osd = le64_to_cpu(-1);
  
  	err = __validate_layout(mdsc, &nl);
  	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_num_caps = 1;
  
  	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);
  
  	err = ceph_mdsc_do_request(mdsc, NULL, 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_inode(file);
  	struct ceph_mds_request *req;
  	struct ceph_ioctl_layout l;
  	int err;
  	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;
  
  	err = __validate_layout(mdsc, &l);
  	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_num_caps = 1;
  
  	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);
  
  	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_inode(file);
  	struct ceph_inode_info *ci = ceph_inode(inode);
  	struct ceph_osd_client *osdc =
  		&ceph_sb_to_client(inode->i_sb)->client->osdc;
  	struct ceph_object_locator oloc;
  	struct ceph_object_id oid;
  	u64 len = 1, olen;
  	u64 tmp;
  	struct ceph_pg pgid;
  	int r;
  
  	/* copy and validate */
  	if (copy_from_user(&dl, arg, sizeof(dl)))
  		return -EFAULT;
  
  	down_read(&osdc->map_sem);
  	r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
  					  &dl.object_no, &dl.object_offset,
  					  &olen);
  	if (r < 0) {
  		up_read(&osdc->map_sem);
  		return -EIO;
  	}
  	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);
  
  	oloc.pool = ceph_file_layout_pg_pool(ci->i_layout);
  	ceph_oid_set_name(&oid, dl.object_name);
  
  	r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid);
  	if (r < 0) {
  		up_read(&osdc->map_sem);
  		return r;
  	}
  
  	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_inode(file);
  	struct ceph_inode_info *ci = ceph_inode(inode);
  
  	if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
  		spin_lock(&ci->i_ceph_lock);
  		ci->i_nr_by_mode[fi->fmode]--;
  		fi->fmode |= CEPH_FILE_MODE_LAZY;
  		ci->i_nr_by_mode[fi->fmode]++;
  		spin_unlock(&ci->i_ceph_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;
  }
  
  static long ceph_ioctl_syncio(struct file *file)
  {
  	struct ceph_file_info *fi = file->private_data;
  
  	fi->flags |= CEPH_F_SYNC;
  	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);
  
  	case CEPH_IOC_SYNCIO:
  		return ceph_ioctl_syncio(file);
  	}
  
  	return -ENOTTY;
  }
  