• Li Zefan's avatar
    Btrfs: Support reading/writing on disk free ino cache · 82d5902d
    Li Zefan authored
    This is similar to block group caching.
    
    We dedicate a special inode in fs tree to save free ino cache.
    
    At the very first time we create/delete a file after mount, the free ino
    cache will be loaded from disk into memory. When the fs tree is commited,
    the cache will be written back to disk.
    
    To keep compatibility, we check the root generation against the generation
    of the special inode when loading the cache, so the loading will fail
    if the btrfs filesystem was mounted in an older kernel before.
    Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
    82d5902d
transaction.c 37.3 KB