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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-09-22 17:38:51 (GMT) |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-27 18:31:27 (GMT) |
| commit | 0a014a44a50839a8064618e959fae5bbc44c2fd5 (patch) | |
| tree | d5817c8c204ed6f710f87a1fc1019283a6372351 /fs/nfs/nfs4state.c | |
| parent | 5690a22d8612e1788b48b4ea53c59868589cd2db (diff) | |
| download | linux-0a014a44a50839a8064618e959fae5bbc44c2fd5.tar.xz | |
NFSv4.1: Don't deadlock the state manager on the SEQUENCE status flags
As described in RFC5661, section 18.46, some of the status flags exist
in order to tell the client when it needs to acknowledge the existence of
revoked state on the server and/or to recover state.
Those flags will then remain set until the recovery procedure is done.
In order to avoid looping, the client therefore needs to ignore
those particular flags while recovering.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4state.c')
| -rw-r--r-- | fs/nfs/nfs4state.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index cada00a..9801b5b 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -2227,13 +2227,22 @@ static void nfs41_handle_cb_path_down(struct nfs_client *clp) nfs4_schedule_state_manager(clp); } -void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) +void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, + bool recovery) { if (!flags) return; dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", __func__, clp->cl_hostname, clp->cl_clientid, flags); + /* + * If we're called from the state manager thread, then assume we're + * already handling the RECLAIM_NEEDED and/or STATE_REVOKED. + * Those flags are expected to remain set until we're done + * recovering (see RFC5661, section 18.46.3). + */ + if (recovery) + goto out_recovery; if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) nfs41_handle_server_reboot(clp); @@ -2246,6 +2255,7 @@ void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) nfs4_schedule_lease_moved_recovery(clp); if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) nfs41_handle_recallable_state_revoked(clp); +out_recovery: if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) nfs41_handle_backchannel_fault(clp); else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | |