Btrfs: Set the btree inode i_size to OFFSET_MAX (0afbaf8c) · Commits · e / devices / android_kernel_fairphone_FP3

fs/btrfs/disk-io.c

+26 −7

Original line number	Diff line number	Diff line
		@@ -88,19 +88,35 @@ struct extent_map btree_get_extent(struct inode inode, struct page *page,
		goto out;
		}
		em->start = 0;
		em->len = i_size_read(inode);
		em->len = (u64)-1;
		em->block_start = 0;
		em->bdev = inode->i_sb->s_bdev;

		spin_lock(&em_tree->lock);
		ret = add_extent_mapping(em_tree, em);
		if (ret == -EEXIST) {
		u64 failed_start = em->start;
		u64 failed_len = em->len;

		printk("failed to insert %Lu %Lu -> %Lu into tree\n",
		em->start, em->len, em->block_start);
		free_extent_map(em);
		em = lookup_extent_mapping(em_tree, start, len);
		if (em)
		if (em) {
		printk("after failing, found %Lu %Lu %Lu\n",
		em->start, em->len, em->block_start);
		ret = 0;
		else
		} else {
		em = lookup_extent_mapping(em_tree, failed_start,
		failed_len);
		if (em) {
		printk("double failure lookup gives us "
		"%Lu %Lu -> %Lu\n", em->start,
		em->len, em->block_start);
		free_extent_map(em);
		}
		ret = -EIO;
		}
		} else if (ret) {
		free_extent_map(em);
		em = NULL;
		@@ -1108,7 +1124,13 @@ struct btrfs_root open_ctree(struct super_block sb,
		fs_info->btree_inode = new_inode(sb);
		fs_info->btree_inode->i_ino = 1;
		fs_info->btree_inode->i_nlink = 1;
		fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;

		/*
		* we set the i_size on the btree inode to the max possible int.
		* the real end of the address space is determined by all of
		* the devices in the system
		*/
		fs_info->btree_inode->i_size = OFFSET_MAX;
		fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
		fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;

		@@ -1196,9 +1218,6 @@ struct btrfs_root open_ctree(struct super_block sb,
		tree_root->stripesize = stripesize;
		sb_set_blocksize(sb, sectorsize);

		i_size_write(fs_info->btree_inode,
		btrfs_super_total_bytes(disk_super));

		if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
		sizeof(disk_super->magic))) {
		printk("btrfs: valid FS not found on %s\n", sb->s_id);