1 files changed, 45 insertions, 0 deletions

diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 3bcd25422ee4..c2324d5fe4ac 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -22,6 +22,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 {
         struct ext2_inode_info *ei = EXT2_I(inode);
         unsigned int flags;
+        unsigned short rsv_window_size;
 
         ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
 
@@ -83,6 +84,50 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
                 inode->i_ctime = CURRENT_TIME_SEC;
                 mark_inode_dirty(inode);
                 return 0;
+        case EXT2_IOC_GETRSVSZ:
+                if (test_opt(inode->i_sb, RESERVATION)
+                        && S_ISREG(inode->i_mode)
+                        && ei->i_block_alloc_info) {
+                        rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
+                        return put_user(rsv_window_size, (int __user *)arg);
+                }
+                return -ENOTTY;
+        case EXT2_IOC_SETRSVSZ: {
+
+                if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+                        return -ENOTTY;
+
+                if (IS_RDONLY(inode))
+                        return -EROFS;
+
+                if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+                        return -EACCES;
+
+                if (get_user(rsv_window_size, (int __user *)arg))
+                        return -EFAULT;
+
+                if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
+                        rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
+
+                /*
+                 * need to allocate reservation structure for this inode
+                 * before set the window size
+                 */
+                /*
+                 * XXX What lock should protect the rsv_goal_size?
+                 * Accessed in ext2_get_block only.  ext3 uses i_truncate.
+                 */
+                mutex_lock(&ei->truncate_mutex);
+                if (!ei->i_block_alloc_info)
+                        ext2_init_block_alloc_info(inode);
+
+                if (ei->i_block_alloc_info){
+                        struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
+                        rsv->rsv_goal_size = rsv_window_size;
+                }
+                mutex_unlock(&ei->truncate_mutex);
+                return 0;
+        }
         default:
                 return -ENOTTY;
         }