tree b018b6ddc5bb5f02b985b06c11f0c01adb38167a
parent a48380f769dfed6163fb82a68b13bd562ea1e027
author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> 1201582706 -0500
committer Theodore Ts'o <tytso@mit.edu> 1201582706 -0500

ext4: Add support for 48 bit inode i_blocks.

Use the __le16 l_i_reserved1 field of the linux2 struct of ext4_inode
to represet the higher 16 bits for i_blocks. With this change max_file
size becomes (2**48 -1 )* 512 bytes.

We add a RO_COMPAT feature to the super block to indicate that inode
have i_blocks represented as a split 48 bits. Super block with this
feature set cannot be mounted read write on a kernel with CONFIG_LSF
disabled.

Super block flag EXT4_FEATURE_RO_COMPAT_HUGE_FILE

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>