Commit e8568739 authored by Jeff Layton's avatar Jeff Layton Committed by J. Bruce Fields
Browse files

nfsd: ensure that the ol stateid hash reference is only put once 



When an open or lock stateid is hashed, we take an extra reference to
it. When we unhash it, we drop that reference. The code however does
not properly account for the case where we have two callers concurrently
trying to unhash the stateid. This can lead to list corruption and the
hash reference being put more than once.

Fix this by having unhash_ol_stateid use list_del_init on the st_perfile
list_head, and then testing to see if that list_head is empty before
releasing the hash reference. This means that some of the unhashing
wrappers now become bool return functions so we can test to see whether
the stateid was unhashed before we put the reference.

Reported-by: default avatarAndrew W Elble <aweits@rit.edu>
Tested-by: default avatarAndrew W Elble <aweits@rit.edu>
Reported-by: default avatarAnna Schumaker <Anna.Schumaker@netapp.com>
Tested-by: default avatarAnna Schumaker <Anna.Schumaker@netapp.com>
Signed-off-by: default avatarJeff Layton <jeff.layton@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 051ac384

fs/nfsd/nfs4state.c

+36 −22
Original line number Diff line number Diff line
@@ -1009,16 +1009,20 @@ static void nfs4_put_stateowner(struct nfs4_stateowner *sop) 
	nfs4_free_stateowner(sop);

}



static void unhash_ol_stateid(struct nfs4_ol_stateid *stp)

static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)

{

	struct nfs4_file *fp = stp->st_stid.sc_file;



	lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);



	if (list_empty(&stp->st_perfile))

		return false;



	spin_lock(&fp->fi_lock);

	list_del(&stp->st_perfile);

	list_del_init(&stp->st_perfile);

	spin_unlock(&fp->fi_lock);

	list_del(&stp->st_perstateowner);

	return true;

}



static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
@@ -1068,24 +1072,26 @@ static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, 
	list_add(&stp->st_locks, reaplist);

}



static void unhash_lock_stateid(struct nfs4_ol_stateid *stp)

static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)

{

	struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);



	lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);



	list_del_init(&stp->st_locks);

	unhash_ol_stateid(stp);

	nfs4_unhash_stid(&stp->st_stid);

	return unhash_ol_stateid(stp);

}



static void release_lock_stateid(struct nfs4_ol_stateid *stp)

{

	struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);

	bool unhashed;



	spin_lock(&oo->oo_owner.so_client->cl_lock);

	unhash_lock_stateid(stp);

	unhashed = unhash_lock_stateid(stp);

	spin_unlock(&oo->oo_owner.so_client->cl_lock);

	if (unhashed)

		nfs4_put_stid(&stp->st_stid);

}
@@ -1134,7 +1140,7 @@ static void release_lockowner(struct nfs4_lockowner *lo) 
	while (!list_empty(&lo->lo_owner.so_stateids)) {

		stp = list_first_entry(&lo->lo_owner.so_stateids,

				struct nfs4_ol_stateid, st_perstateowner);

		unhash_lock_stateid(stp);

		WARN_ON(!unhash_lock_stateid(stp));

		put_ol_stateid_locked(stp, &reaplist);

	}

	spin_unlock(&clp->cl_lock);
@@ -1147,21 +1153,26 @@ static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp, 
{

	struct nfs4_ol_stateid *stp;



	lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);



	while (!list_empty(&open_stp->st_locks)) {

		stp = list_entry(open_stp->st_locks.next,

				struct nfs4_ol_stateid, st_locks);

		unhash_lock_stateid(stp);

		WARN_ON(!unhash_lock_stateid(stp));

		put_ol_stateid_locked(stp, reaplist);

	}

}



static void unhash_open_stateid(struct nfs4_ol_stateid *stp,

static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,

				struct list_head *reaplist)

{

	bool unhashed;



	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);



	unhash_ol_stateid(stp);

	unhashed = unhash_ol_stateid(stp);

	release_open_stateid_locks(stp, reaplist);

	return unhashed;

}



static void release_open_stateid(struct nfs4_ol_stateid *stp)
@@ -1169,7 +1180,7 @@ static void release_open_stateid(struct nfs4_ol_stateid *stp) 
	LIST_HEAD(reaplist);



	spin_lock(&stp->st_stid.sc_client->cl_lock);

	unhash_open_stateid(stp, &reaplist);

	if (unhash_open_stateid(stp, &reaplist))

		put_ol_stateid_locked(stp, &reaplist);

	spin_unlock(&stp->st_stid.sc_client->cl_lock);

	free_ol_stateid_reaplist(&reaplist);
@@ -1215,7 +1226,7 @@ static void release_openowner(struct nfs4_openowner *oo) 
	while (!list_empty(&oo->oo_owner.so_stateids)) {

		stp = list_first_entry(&oo->oo_owner.so_stateids,

				struct nfs4_ol_stateid, st_perstateowner);

		unhash_open_stateid(stp, &reaplist);

		if (unhash_open_stateid(stp, &reaplist))

			put_ol_stateid_locked(stp, &reaplist);

	}

	spin_unlock(&clp->cl_lock);
@@ -4752,7 +4763,7 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
		if (check_for_locks(stp->st_stid.sc_file,

				    lockowner(stp->st_stateowner)))

			break;

		unhash_lock_stateid(stp);

		WARN_ON(!unhash_lock_stateid(stp));

		spin_unlock(&cl->cl_lock);

		nfs4_put_stid(s);

		ret = nfs_ok;
@@ -4968,19 +4979,22 @@ out: 
static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)

{

	struct nfs4_client *clp = s->st_stid.sc_client;

	bool unhashed;

	LIST_HEAD(reaplist);



	s->st_stid.sc_type = NFS4_CLOSED_STID;

	spin_lock(&clp->cl_lock);

	unhash_open_stateid(s, &reaplist);

	unhashed = unhash_open_stateid(s, &reaplist);



	if (clp->cl_minorversion) {

		if (unhashed)

			put_ol_stateid_locked(s, &reaplist);

		spin_unlock(&clp->cl_lock);

		free_ol_stateid_reaplist(&reaplist);

	} else {

		spin_unlock(&clp->cl_lock);

		free_ol_stateid_reaplist(&reaplist);

		if (unhashed)

			move_to_close_lru(s, clp->net);

	}

}
@@ -6014,7 +6028,7 @@ nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst, 


static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,

				    struct list_head *collect,

				    void (*func)(struct nfs4_ol_stateid *))

				    bool (*func)(struct nfs4_ol_stateid *))

{

	struct nfs4_openowner *oop;

	struct nfs4_ol_stateid *stp, *st_next;
@@ -6028,7 +6042,7 @@ static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, 
			list_for_each_entry_safe(lst, lst_next,

					&stp->st_locks, st_locks) {

				if (func) {

					func(lst);

					if (func(lst))

						nfsd_inject_add_lock_to_list(lst,

									collect);

				}

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