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    Btrfs: Always use 64bit inode number · 33345d01
    Li Zefan 提交于
    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: NLi Zefan <lizf@cn.fujitsu.com>
    33345d01
file-item.c 22.6 KB