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nfsd4: remove state lock from nfsd4_load_reboot_recovery_data 

That function is only called under nfsd_mutex: we know that because the
only caller is nfsd_svc, via

        nfsd_svc
          nfsd_startup
            nfs4_state_start
              nfsd4_client_tracking_init
                client_tracking_ops->init == nfsd4_load_reboot_recovery_data

The shared state accessed here includes:

        - user_recovery_dirname: used here, modified only by
          nfs4_reset_recoverydir, which can be verified to only be
          called under nfsd_mutex.
        - filesystem state, protected by i_mutex (handwaving slightly
	  here)
        - rec_file, reclaim_str_hashtbl, reclaim_str_hashtbl_size: other
          than here, used only from code called from nfsd or laundromat
          threads, both of which should be started only after this runs
          (see nfsd_svc) and stopped before this could run again (see
          nfsd_shutdown, called from nfsd_last_thread).

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-11-16 11:45:12 -05:00
parent a36b1725b3
commit dba88ba55a
1 changed files with 0 additions and 2 deletions
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2
fs/nfsd/nfs4recover.c
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@ -509,11 +509,9 @@ nfsd4_load_reboot_recovery_data(struct net *net)
{
int status;
nfs4_lock_state();
status = nfsd4_init_recdir();
if (!status)
status = nfsd4_recdir_load(net);
nfs4_unlock_state();
if (status)
printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
return status;