ext4: different maxbytes functions for bitmap & extent files

#endif

	sb->s_flags = s_flags; /* Restore MS_RDONLY status */

}

/*

 * Maximal extent format file size.

 * Resulting logical blkno at s_maxbytes must fit in our on-disk

 * extent format containers, within a sector_t, and within i_blocks

 * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,

 * so that won't be a limiting factor.

 *

 * Note, this does *not* consider any metadata overhead for vfs i_blocks.

 */

static loff_t ext4_max_size(int blkbits)

{

	loff_t res;

	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */

	if (sizeof(blkcnt_t) < sizeof(u64)) {

		/*

		 * CONFIG_LSF is not enabled implies the inode

		 * i_block represent total blocks in 512 bytes

		 * 32 == size of vfs inode i_blocks * 8

		 */

		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */

		upper_limit >>= (blkbits - 9);

		upper_limit <<= blkbits;

	}

	/* 32-bit extent-start container, ee_block */

	res = 1LL << 32;

	res <<= blkbits;

	res -= 1;

	/* Sanity check against vm- & vfs- imposed limits */

	if (res > upper_limit)

		res = upper_limit;

	return res;

}

/*

 * Maximal file size.  There is a direct, and {,double-,triple-}indirect

 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect

 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.

 * We need to be 1 filesystem block less than the 2^48 sector limit.

 */

static loff_t ext4_max_size(int bits)

static loff_t ext4_max_bitmap_size(int bits)

{

	loff_t res = EXT4_NDIR_BLOCKS;

	int meta_blocks;

	loff_t upper_limit;

	/* This is calculated to be the largest file size for a

	 * dense, file such that the total number of

	 * dense, bitmapped file such that the total number of

	 * sectors in the file, including data and all indirect blocks,

	 * does not exceed 2^48 -1

	 * __u32 i_blocks_lo and _u16 i_blocks_high representing the