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nfsd4: distinguish expired from stale stateids 

If we encode the time of client creation into the stateid instead of the
time of server boot, then we can determine whether that stateid is from
a previous instance of the a server, or from a client that has expired,
and return an appropriate error to the client.

Signed-off-by: Bian Naimeng <biannm@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Bian Naimeng 2009-04-22 18:25:37 +08:00 committed by J. Bruce Fields
parent a9e61e25f9
commit 78155ed75f
1 changed files with 49 additions and 13 deletions
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62
fs/nfsd/nfs4state.c
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@ -206,7 +206,7 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f
dp->dl_recall.cbr_dp = NULL;
dp->dl_recall.cbr_ident = cb->cb_ident;
dp->dl_recall.cbr_trunc = 0;
dp->dl_stateid.si_boot = boot_time;
dp->dl_stateid.si_boot = get_seconds();
dp->dl_stateid.si_stateownerid = current_delegid++;
dp->dl_stateid.si_fileid = 0;
dp->dl_stateid.si_generation = 0;
@ -1883,7 +1883,7 @@ init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *
stp->st_stateowner = sop;
get_nfs4_file(fp);
stp->st_file = fp;
stp->st_stateid.si_boot = boot_time;
stp->st_stateid.si_boot = get_seconds();
stp->st_stateid.si_stateownerid = sop->so_id;
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;
@ -2739,12 +2739,42 @@ nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
static int
STALE_STATEID(stateid_t *stateid)
{
if (stateid->si_boot == boot_time)
return 0;
dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
stateid->si_generation);
return 1;
if (time_after((unsigned long)boot_time,
(unsigned long)stateid->si_boot)) {
dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
stateid->si_boot, stateid->si_stateownerid,
stateid->si_fileid, stateid->si_generation);
return 1;
}
return 0;
}
static int
EXPIRED_STATEID(stateid_t *stateid)
{
if (time_before((unsigned long)boot_time,
((unsigned long)stateid->si_boot)) &&
time_before((stateid->si_boot + lease_time), get_seconds())) {
dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
stateid->si_boot, stateid->si_stateownerid,
stateid->si_fileid, stateid->si_generation);
return 1;
}
return 0;
}
static __be32
stateid_error_map(stateid_t *stateid)
{
if (STALE_STATEID(stateid))
return nfserr_stale_stateid;
if (EXPIRED_STATEID(stateid))
return nfserr_expired;
dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
stateid->si_boot, stateid->si_stateownerid,
stateid->si_fileid, stateid->si_generation);
return nfserr_bad_stateid;
}
static inline int
@ -2868,8 +2898,10 @@ nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
status = nfserr_bad_stateid;
if (is_delegation_stateid(stateid)) {
dp = find_delegation_stateid(ino, stateid);
if (!dp)
if (!dp) {
status = stateid_error_map(stateid);
goto out;
}
status = check_stateid_generation(stateid, &dp->dl_stateid,
flags);
if (status)
@ -2882,8 +2914,10 @@ nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
*filpp = dp->dl_vfs_file;
} else { /* open or lock stateid */
stp = find_stateid(stateid, flags);
if (!stp)
if (!stp) {
status = stateid_error_map(stateid);
goto out;
}
if (nfs4_check_fh(current_fh, stp))
goto out;
if (!stp->st_stateowner->so_confirmed)
@ -2957,7 +2991,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
*/
sop = search_close_lru(stateid->si_stateownerid, flags);
if (sop == NULL)
return nfserr_bad_stateid;
return stateid_error_map(stateid);
*sopp = sop;
goto check_replay;
}
@ -3228,8 +3262,10 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (!is_delegation_stateid(stateid))
goto out;
dp = find_delegation_stateid(inode, stateid);
if (!dp)
if (!dp) {
status = stateid_error_map(stateid);
goto out;
}
status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
if (status)
goto out;
@ -3456,7 +3492,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
stp->st_stateowner = sop;
get_nfs4_file(fp);
stp->st_file = fp;
stp->st_stateid.si_boot = boot_time;
stp->st_stateid.si_boot = get_seconds();
stp->st_stateid.si_stateownerid = sop->so_id;
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;