• Qu Wenruo's avatar
    btrfs: Add noinode_cache mount option · 3818aea2
    Qu Wenruo authored
    
    
    Add noinode_cache mount option for btrfs.
    
    Since inode map cache involves all the btrfs_find_free_ino/return_ino
    things and if just trigger the mount_opt,
    an inode number get from inode map cache will not returned to inode map
    cache.
    
    To keep the find and return inode both in the same behavior,
    a new bit in mount_opt, CHANGE_INODE_CACHE, is introduced for this idea.
    CHANGE_INODE_CACHE is set/cleared in remounting, and the original
    INODE_MAP_CACHE is set/cleared according to CHANGE_INODE_CACHE after a
    success transaction.
    Since find/return inode is all done between btrfs_start_transaction and
    btrfs_commit_transaction, this will keep consistent behavior.
    
    Also noinode_cache mount option will not stop the caching_kthread.
    
    Cc: David Sterba <dsterba@suse.cz>
    Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
    Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
    Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
    Signed-off-by: default avatarChris Mason <clm@fb.com>
    3818aea2