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nfsd4: match close replays on stateid, not open owner id

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Keep around an unhashed copy of the final stateid after the last close
using an openowner, and when identifying a replay, match against that
stateid instead of just against the open owner id.  Free it the next
time the seqid is bumped or the stateowner is destroyed.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-09-16 17:42:48 -04:00
parent dad1c067eb
commit 38c387b52d
3 changed files with 44 additions and 7 deletions
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47
fs/nfsd/nfs4state.c
View File

@ -438,7 +438,6 @@ static void close_generic_stateid(struct nfs4_ol_stateid *stp)
static void free_generic_stateid(struct nfs4_ol_stateid *stp)
{
close_generic_stateid(stp);
kmem_cache_free(stateid_slab, stp);
}
@ -450,6 +449,7 @@ static void release_lock_stateid(struct nfs4_ol_stateid *stp)
file = find_any_file(stp->st_file);
if (file)
locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
close_generic_stateid(stp);
free_generic_stateid(stp);
}
@ -485,10 +485,16 @@ release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
}
}
static void release_open_stateid(struct nfs4_ol_stateid *stp)
static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
{
unhash_generic_stateid(stp);
release_stateid_lockowners(stp);
close_generic_stateid(stp);
}
static void release_open_stateid(struct nfs4_ol_stateid *stp)
{
unhash_open_stateid(stp);
free_generic_stateid(stp);
}
@ -510,6 +516,8 @@ static void release_openowner(struct nfs4_openowner *oo)
{
unhash_openowner(oo);
list_del(&oo->oo_close_lru);
if (oo->oo_last_closed_stid)
free_generic_stateid(oo->oo_last_closed_stid);
nfs4_free_openowner(oo);
}
@ -2324,6 +2332,7 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
oo->oo_owner.so_seqid = open->op_seqid;
oo->oo_flags = 0;
oo->oo_time = 0;
oo->oo_last_closed_stid = NULL;
INIT_LIST_HEAD(&oo->oo_close_lru);
hash_openowner(oo, clp, strhashval);
return oo;
@ -3120,12 +3129,14 @@ laundromat_main(struct work_struct *not_used)
queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
}
static struct nfs4_openowner * search_close_lru(u32 st_id)
static struct nfs4_openowner * search_close_lru(stateid_t *s)
{
struct nfs4_openowner *local;
struct nfs4_ol_stateid *os;
list_for_each_entry(local, &close_lru, oo_close_lru) {
if (local->oo_owner.so_id == st_id)
os = local->oo_last_closed_stid;
if (same_stateid(&os->st_stid.sc_stateid, s))
return local;
}
return NULL;
@ -3589,6 +3600,27 @@ out:
return status;
}
void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
{
struct nfs4_openowner *oo;
struct nfs4_ol_stateid *s;
if (!so->so_is_open_owner)
return;
oo = openowner(so);
s = oo->oo_last_closed_stid;
if (!s)
return;
if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
/* Release the last_closed_stid on the next seqid bump: */
oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
return;
}
oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
free_generic_stateid(oo->oo_last_closed_stid);
oo->oo_last_closed_stid = NULL;
}
/*
* nfs4_unlock_state() called after encode
*/
@ -3613,7 +3645,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
* Also, we should make sure this isn't just the result of
* a replayed close:
*/
oo = search_close_lru(close->cl_stateid.si_stateownerid);
oo = search_close_lru(&close->cl_stateid);
/* It's not stale; let's assume it's expired: */
if (oo == NULL)
goto out;
@ -3630,8 +3662,9 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
update_stateid(&stp->st_stid.sc_stateid);
memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
/* release_stateid() calls nfsd_close() if needed */
release_open_stateid(stp);
/* unhash_open_stateid() calls nfsd_close() if needed */
oo->oo_last_closed_stid = stp;
unhash_open_stateid(stp);
/* place unused nfs4_stateowners on so_close_lru list to be
* released by the laundromat service after the lease period

1
fs/nfsd/nfs4xdr.c
View File

@ -1636,6 +1636,7 @@ static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, _
(char *)resp->p - (char *)save;
memcpy(stateowner->so_replay.rp_buf, save,
stateowner->so_replay.rp_buflen);
nfsd4_purge_closed_stateid(stateowner);
}
}

3
fs/nfsd/state.h
View File

@ -370,8 +370,10 @@ struct nfs4_openowner {
struct nfs4_stateowner oo_owner; /* must be first field */
struct list_head oo_perclient;
struct list_head oo_close_lru; /* tail queue */
struct nfs4_ol_stateid *oo_last_closed_stid;
time_t oo_time; /* time of placement on so_close_lru */
#define NFS4_OO_CONFIRMED 1
#define NFS4_OO_PURGE_CLOSE 2
unsigned char oo_flags;
};
@ -514,5 +516,6 @@ extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
extern void release_session_client(struct nfsd4_session *);
extern __be32 nfs4_validate_stateid(stateid_t *, bool);
extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);
#endif /* NFSD4_STATE_H */