#1065 "directory check" phase of spool_check feature is too slow if there are lots of replicas which will be removed

[SODA Noriyuki]

main trunk doesn't have this problem because there is dead_copies member in struct inode.

possible workaround of this problem is:

1. start gfsd with "spool_check disable" configuration
2. wait until all replicas are removed
3. then restart gfsd with "spool_check enable"

or just disable spool_check, even.

you can see the number of replicas which will be removed by the following command:

# config-gfarm-update --prefix <prefix_option_of_config-gfarm_command>

gfarm=# select count(*) from DeadFileCopy;
 count 
-------
     0