tree 6a978702dc4421768e63501fa15bc8fedd5bff32
parent 0414efae7989a2183fb2cc000ab285c4c2836a00
author Li Zefan <lizf@cn.fujitsu.com> 1303266710 +0800
committer Li Zefan <lizf@cn.fujitsu.com> 1303721169 +0800

Btrfs: Always use 64bit inode number

There's a potential problem in 32bit system when we exhaust 32bit inode
numbers and start to allocate big inode numbers, because btrfs uses
inode->i_ino in many places.

So here we always use BTRFS_I(inode)->location.objectid, which is an
u64 variable.

There are 2 exceptions that BTRFS_I(inode)->location.objectid !=
inode->i_ino: the btree inode (0 vs 1) and empty subvol dirs (256 vs 2),
and inode->i_ino will be used in those cases.

Another reason to make this change is I'm going to use a special inode
to save free ino cache, and the inode number must be > (u64)-256.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>