Message ID | 1405521125-2303-5-git-send-email-jlayton@primarydata.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
On Wed, Jul 16, 2014 at 10:31:59AM -0400, Jeff Layton wrote: > From: Trond Myklebust <trond.myklebust@primarydata.com> > > Add an extra delegation state to allow the stateid to remain in the idr > tree until the last reference has been released. This will be necessary > to ensure uniqueness once the client_mutex is removed. Cyclic idr allocation should make reuse extremely unlikely, shouldn't it? Probably needs to be fixed anyway, applying. --b. > > [jlayton: reset the sc_type under the state_lock in unhash_delegation] > > Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> > Signed-off-by: Jeff Layton <jlayton@primarydata.com> > Reviewed-by: Christoph Hellwig <hch@lst.de> > --- > fs/nfsd/nfs4state.c | 8 ++++---- > fs/nfsd/state.h | 1 + > 2 files changed, 5 insertions(+), 4 deletions(-) > > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > index 1b01a20827ab..fd4deb049ddf 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -616,6 +616,7 @@ void > nfs4_put_delegation(struct nfs4_delegation *dp) > { > if (atomic_dec_and_test(&dp->dl_count)) { > + remove_stid(&dp->dl_stid); > nfs4_free_stid(deleg_slab, &dp->dl_stid); > num_delegations--; > } > @@ -657,6 +658,7 @@ unhash_delegation(struct nfs4_delegation *dp) > struct nfs4_file *fp = dp->dl_file; > > spin_lock(&state_lock); > + dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; > list_del_init(&dp->dl_perclnt); > list_del_init(&dp->dl_recall_lru); > spin_lock(&fp->fi_lock); > @@ -670,19 +672,15 @@ unhash_delegation(struct nfs4_delegation *dp) > } > } > > - > - > static void destroy_revoked_delegation(struct nfs4_delegation *dp) > { > list_del_init(&dp->dl_recall_lru); > - remove_stid(&dp->dl_stid); > nfs4_put_delegation(dp); > } > > static void destroy_delegation(struct nfs4_delegation *dp) > { > unhash_delegation(dp); > - remove_stid(&dp->dl_stid); > nfs4_put_delegation(dp); > } > > @@ -4036,7 +4034,9 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) > return nfs_ok; > default: > printk("unknown stateid type %x\n", s->sc_type); > + /* Fallthrough */ > case NFS4_CLOSED_STID: > + case NFS4_CLOSED_DELEG_STID: > return nfserr_bad_stateid; > } > } > diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h > index 81b7522e3f67..996d61eeb357 100644 > --- a/fs/nfsd/state.h > +++ b/fs/nfsd/state.h > @@ -80,6 +80,7 @@ struct nfs4_stid { > #define NFS4_CLOSED_STID 8 > /* For a deleg stateid kept around only to process free_stateid's: */ > #define NFS4_REVOKED_DELEG_STID 16 > +#define NFS4_CLOSED_DELEG_STID 32 > unsigned char sc_type; > stateid_t sc_stateid; > struct nfs4_client *sc_client; > -- > 1.9.3 > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, 17 Jul 2014 14:44:17 -0400 "J. Bruce Fields" <bfields@fieldses.org> wrote: > On Wed, Jul 16, 2014 at 10:31:59AM -0400, Jeff Layton wrote: > > From: Trond Myklebust <trond.myklebust@primarydata.com> > > > > Add an extra delegation state to allow the stateid to remain in the idr > > tree until the last reference has been released. This will be necessary > > to ensure uniqueness once the client_mutex is removed. > > Cyclic idr allocation should make reuse extremely unlikely, shouldn't > it? > > Probably needs to be fixed anyway, applying. > > --b. > Yes, for the most part, but reuse is still possible once the counter wraps if you had a long-lived stateid (for instance). Not a likely problem, but we might as well fix it while we're in here. > > > > [jlayton: reset the sc_type under the state_lock in > > unhash_delegation] > > > > Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> > > Signed-off-by: Jeff Layton <jlayton@primarydata.com> > > Reviewed-by: Christoph Hellwig <hch@lst.de> > > --- > > fs/nfsd/nfs4state.c | 8 ++++---- > > fs/nfsd/state.h | 1 + > > 2 files changed, 5 insertions(+), 4 deletions(-) > > > > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > > index 1b01a20827ab..fd4deb049ddf 100644 > > --- a/fs/nfsd/nfs4state.c > > +++ b/fs/nfsd/nfs4state.c > > @@ -616,6 +616,7 @@ void > > nfs4_put_delegation(struct nfs4_delegation *dp) > > { > > if (atomic_dec_and_test(&dp->dl_count)) { > > + remove_stid(&dp->dl_stid); > > nfs4_free_stid(deleg_slab, &dp->dl_stid); > > num_delegations--; > > } > > @@ -657,6 +658,7 @@ unhash_delegation(struct nfs4_delegation *dp) > > struct nfs4_file *fp = dp->dl_file; > > > > spin_lock(&state_lock); > > + dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; > > list_del_init(&dp->dl_perclnt); > > list_del_init(&dp->dl_recall_lru); > > spin_lock(&fp->fi_lock); > > @@ -670,19 +672,15 @@ unhash_delegation(struct nfs4_delegation *dp) > > } > > } > > > > - > > - > > static void destroy_revoked_delegation(struct nfs4_delegation *dp) > > { > > list_del_init(&dp->dl_recall_lru); > > - remove_stid(&dp->dl_stid); > > nfs4_put_delegation(dp); > > } > > > > static void destroy_delegation(struct nfs4_delegation *dp) > > { > > unhash_delegation(dp); > > - remove_stid(&dp->dl_stid); > > nfs4_put_delegation(dp); > > } > > > > @@ -4036,7 +4034,9 @@ static __be32 nfsd4_validate_stateid(struct > > nfs4_client *cl, stateid_t *stateid) return nfs_ok; > > default: > > printk("unknown stateid type %x\n", s->sc_type); > > + /* Fallthrough */ > > case NFS4_CLOSED_STID: > > + case NFS4_CLOSED_DELEG_STID: > > return nfserr_bad_stateid; > > } > > } > > diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h > > index 81b7522e3f67..996d61eeb357 100644 > > --- a/fs/nfsd/state.h > > +++ b/fs/nfsd/state.h > > @@ -80,6 +80,7 @@ struct nfs4_stid { > > #define NFS4_CLOSED_STID 8 > > /* For a deleg stateid kept around only to process free_stateid's: > > */ #define NFS4_REVOKED_DELEG_STID 16 > > +#define NFS4_CLOSED_DELEG_STID 32 > > unsigned char sc_type; > > stateid_t sc_stateid; > > struct nfs4_client *sc_client; > > -- > > 1.9.3 > >
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 1b01a20827ab..fd4deb049ddf 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -616,6 +616,7 @@ void nfs4_put_delegation(struct nfs4_delegation *dp) { if (atomic_dec_and_test(&dp->dl_count)) { + remove_stid(&dp->dl_stid); nfs4_free_stid(deleg_slab, &dp->dl_stid); num_delegations--; } @@ -657,6 +658,7 @@ unhash_delegation(struct nfs4_delegation *dp) struct nfs4_file *fp = dp->dl_file; spin_lock(&state_lock); + dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; list_del_init(&dp->dl_perclnt); list_del_init(&dp->dl_recall_lru); spin_lock(&fp->fi_lock); @@ -670,19 +672,15 @@ unhash_delegation(struct nfs4_delegation *dp) } } - - static void destroy_revoked_delegation(struct nfs4_delegation *dp) { list_del_init(&dp->dl_recall_lru); - remove_stid(&dp->dl_stid); nfs4_put_delegation(dp); } static void destroy_delegation(struct nfs4_delegation *dp) { unhash_delegation(dp); - remove_stid(&dp->dl_stid); nfs4_put_delegation(dp); } @@ -4036,7 +4034,9 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) return nfs_ok; default: printk("unknown stateid type %x\n", s->sc_type); + /* Fallthrough */ case NFS4_CLOSED_STID: + case NFS4_CLOSED_DELEG_STID: return nfserr_bad_stateid; } } diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index 81b7522e3f67..996d61eeb357 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -80,6 +80,7 @@ struct nfs4_stid { #define NFS4_CLOSED_STID 8 /* For a deleg stateid kept around only to process free_stateid's: */ #define NFS4_REVOKED_DELEG_STID 16 +#define NFS4_CLOSED_DELEG_STID 32 unsigned char sc_type; stateid_t sc_stateid; struct nfs4_client *sc_client;