Merge branch 'for_linus' into for_linus_merged
[linux-2.6.git] / fs / ext4 / ioctl.c
index e87a932..6eee255 100644 (file)
@@ -18,6 +18,8 @@
 #include "ext4_jbd2.h"
 #include "ext4.h"
 
+#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
+
 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        struct inode *inode = filp->f_dentry->d_inode;
@@ -186,19 +188,22 @@ setversion_out:
                if (err)
                        return err;
 
-               if (get_user(n_blocks_count, (__u32 __user *)arg))
-                       return -EFAULT;
+               if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+                       err = -EFAULT;
+                       goto group_extend_out;
+               }
 
                if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
                               EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
                        ext4_msg(sb, KERN_ERR,
                                 "Online resizing not supported with bigalloc");
-                       return -EOPNOTSUPP;
+                       err = -EOPNOTSUPP;
+                       goto group_extend_out;
                }
 
                err = mnt_want_write_file(filp);
                if (err)
-                       return err;
+                       goto group_extend_out;
 
                err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
                if (EXT4_SB(sb)->s_journal) {
@@ -209,8 +214,8 @@ setversion_out:
                if (err == 0)
                        err = err2;
                mnt_drop_write_file(filp);
+group_extend_out:
                ext4_resize_end(sb);
-
                return err;
        }
 
@@ -251,8 +256,7 @@ setversion_out:
                err = ext4_move_extents(filp, donor_filp, me.orig_start,
                                        me.donor_start, me.len, &me.moved_len);
                mnt_drop_write_file(filp);
-               if (me.moved_len > 0)
-                       file_remove_suid(donor_filp);
+               mnt_drop_write(filp->f_path.mnt);
 
                if (copy_to_user((struct move_extent __user *)arg,
                                 &me, sizeof(me)))
@@ -271,19 +275,22 @@ mext_out:
                        return err;
 
                if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
-                               sizeof(input)))
-                       return -EFAULT;
+                               sizeof(input))) {
+                       err = -EFAULT;
+                       goto group_add_out;
+               }
 
                if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
                               EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
                        ext4_msg(sb, KERN_ERR,
                                 "Online resizing not supported with bigalloc");
-                       return -EOPNOTSUPP;
+                       err = -EOPNOTSUPP;
+                       goto group_add_out;
                }
 
                err = mnt_want_write_file(filp);
                if (err)
-                       return err;
+                       goto group_add_out;
 
                err = ext4_group_add(sb, &input);
                if (EXT4_SB(sb)->s_journal) {
@@ -294,8 +301,8 @@ mext_out:
                if (err == 0)
                        err = err2;
                mnt_drop_write_file(filp);
+group_add_out:
                ext4_resize_end(sb);
-
                return err;
        }
 
@@ -335,6 +342,60 @@ mext_out:
                return err;
        }
 
+       case EXT4_IOC_RESIZE_FS: {
+               ext4_fsblk_t n_blocks_count;
+               struct super_block *sb = inode->i_sb;
+               int err = 0, err2 = 0;
+
+               if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+                              EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
+                       ext4_msg(sb, KERN_ERR,
+                                "Online resizing not (yet) supported with bigalloc");
+                       return -EOPNOTSUPP;
+               }
+
+               if (EXT4_HAS_INCOMPAT_FEATURE(sb,
+                              EXT4_FEATURE_INCOMPAT_META_BG)) {
+                       ext4_msg(sb, KERN_ERR,
+                                "Online resizing not (yet) supported with meta_bg");
+                       return -EOPNOTSUPP;
+               }
+
+               if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
+                                  sizeof(__u64))) {
+                       return -EFAULT;
+               }
+
+               if (n_blocks_count > MAX_32_NUM &&
+                   !EXT4_HAS_INCOMPAT_FEATURE(sb,
+                                              EXT4_FEATURE_INCOMPAT_64BIT)) {
+                       ext4_msg(sb, KERN_ERR,
+                                "File system only supports 32-bit block numbers");
+                       return -EOPNOTSUPP;
+               }
+
+               err = ext4_resize_begin(sb);
+               if (err)
+                       return err;
+
+               err = mnt_want_write(filp->f_path.mnt);
+               if (err)
+                       goto resizefs_out;
+
+               err = ext4_resize_fs(sb, n_blocks_count);
+               if (EXT4_SB(sb)->s_journal) {
+                       jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+                       err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+                       jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+               }
+               if (err == 0)
+                       err = err2;
+               mnt_drop_write(filp->f_path.mnt);
+resizefs_out:
+               ext4_resize_end(sb);
+               return err;
+       }
+
        case FITRIM:
        {
                struct request_queue *q = bdev_get_queue(sb->s_bdev);
@@ -433,6 +494,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        }
        case EXT4_IOC_MOVE_EXT:
        case FITRIM:
+       case EXT4_IOC_RESIZE_FS:
                break;
        default:
                return -ENOIOCTLCMD;