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Commit 016200c3 authored by Jeff Layton's avatar Jeff Layton Committed by J. Bruce Fields
Browse files

nfsd: add more granular locking to forget_locks fault injector 



...instead of relying on the client_mutex.

Signed-off-by: default avatarJeff Layton <jlayton@primarydata.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 3738d50e

fs/nfsd/fault_inject.c

+3 −5
Original line number Diff line number Diff line
@@ -140,11 +140,9 @@ static struct nfsd_fault_inject_op inject_ops[] = { 
	},

	{

		.file     = "forget_locks",

		.get	  = nfsd_inject_get,

		.set_val  = nfsd_inject_set,

		.set_clnt = nfsd_inject_set_client,

		.forget   = nfsd_forget_client_locks,

		.print    = nfsd_print_client_locks,

		.get	  = nfsd_inject_print_locks,

		.set_val  = nfsd_inject_forget_locks,

		.set_clnt = nfsd_inject_forget_client_locks,

	},

	{

		.file     = "forget_openowners",

fs/nfsd/nfs4state.c

+123 −9
Original line number Diff line number Diff line
@@ -5723,6 +5723,12 @@ nfs4_check_open_reclaim(clientid_t *clid, 
}



#ifdef CONFIG_NFSD_FAULT_INJECTION

static inline void

put_client(struct nfs4_client *clp)

{

	atomic_dec(&clp->cl_refcount);

}



u64

nfsd_inject_print_clients(struct nfsd_fault_inject_op *op)

{
@@ -5810,6 +5816,22 @@ static void nfsd_print_count(struct nfs4_client *clp, unsigned int count, 
	printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);

}



static void

nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,

			     struct list_head *collect)

{

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

	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,

					  nfsd_net_id);



	if (!collect)

		return;



	lockdep_assert_held(&nn->client_lock);

	atomic_inc(&clp->cl_refcount);

	list_add(&lst->st_locks, collect);

}



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

				    struct list_head *collect,

				    void (*func)(struct nfs4_ol_stateid *))
@@ -5819,6 +5841,7 @@ static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, 
	struct nfs4_ol_stateid *lst, *lst_next;

	u64 count = 0;



	spin_lock(&clp->cl_lock);

	list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {

		list_for_each_entry_safe(stp, st_next,

				&oop->oo_owner.so_stateids, st_perstateowner) {
@@ -5826,31 +5849,122 @@ static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, 
					&stp->st_locks, st_locks) {

				if (func) {

					func(lst);

					if (collect)

						list_add(&lst->st_locks,

					nfsd_inject_add_lock_to_list(lst,

								collect);

				}

				if (++count == max)

					return count;

				++count;

				/*

				 * Despite the fact that these functions deal

				 * with 64-bit integers for "count", we must

				 * ensure that it doesn't blow up the

				 * clp->cl_refcount. Throw a warning if we

				 * start to approach INT_MAX here.

				 */

				WARN_ON_ONCE(count == (INT_MAX / 2));

				if (count == max)

					goto out;

			}

		}

	}

out:

	spin_unlock(&clp->cl_lock);



	return count;

}



u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)

static u64

nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,

			  u64 max)

{

	return nfsd_foreach_client_lock(clp, max, NULL, release_lock_stateid);

	return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);

}



u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)

static u64

nfsd_print_client_locks(struct nfs4_client *clp)

{

	u64 count = nfsd_foreach_client_lock(clp, max, NULL, NULL);

	u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);

	nfsd_print_count(clp, count, "locked files");

	return count;

}



u64

nfsd_inject_print_locks(struct nfsd_fault_inject_op *op)

{

	struct nfs4_client *clp;

	u64 count = 0;

	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,

						nfsd_net_id);



	if (!nfsd_netns_ready(nn))

		return 0;



	spin_lock(&nn->client_lock);

	list_for_each_entry(clp, &nn->client_lru, cl_lru)

		count += nfsd_print_client_locks(clp);

	spin_unlock(&nn->client_lock);



	return count;

}



static void

nfsd_reap_locks(struct list_head *reaplist)

{

	struct nfs4_client *clp;

	struct nfs4_ol_stateid *stp, *next;



	list_for_each_entry_safe(stp, next, reaplist, st_locks) {

		list_del_init(&stp->st_locks);

		clp = stp->st_stid.sc_client;

		nfs4_put_stid(&stp->st_stid);

		put_client(clp);

	}

}



u64

nfsd_inject_forget_client_locks(struct nfsd_fault_inject_op *op,

				struct sockaddr_storage *addr, size_t addr_size)

{

	unsigned int count = 0;

	struct nfs4_client *clp;

	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,

						nfsd_net_id);

	LIST_HEAD(reaplist);



	if (!nfsd_netns_ready(nn))

		return count;



	spin_lock(&nn->client_lock);

	clp = nfsd_find_client(addr, addr_size);

	if (clp)

		count = nfsd_collect_client_locks(clp, &reaplist, 0);

	spin_unlock(&nn->client_lock);

	nfsd_reap_locks(&reaplist);

	return count;

}



u64

nfsd_inject_forget_locks(struct nfsd_fault_inject_op *op, u64 max)

{

	u64 count = 0;

	struct nfs4_client *clp;

	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,

						nfsd_net_id);

	LIST_HEAD(reaplist);



	if (!nfsd_netns_ready(nn))

		return count;



	spin_lock(&nn->client_lock);

	list_for_each_entry(clp, &nn->client_lru, cl_lru) {

		count += nfsd_collect_client_locks(clp, &reaplist, max - count);

		if (max != 0 && count >= max)

			break;

	}

	spin_unlock(&nn->client_lock);

	nfsd_reap_locks(&reaplist);

	return count;

}



static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))

{

	struct nfs4_openowner *oop, *next;

fs/nfsd/state.h

+5 −2
Original line number Diff line number Diff line
@@ -483,12 +483,15 @@ u64 nfsd_inject_forget_client(struct nfsd_fault_inject_op *, 
			      struct sockaddr_storage *, size_t);

u64 nfsd_inject_forget_clients(struct nfsd_fault_inject_op *, u64);



u64 nfsd_forget_client_locks(struct nfs4_client*, u64);

u64 nfsd_inject_print_locks(struct nfsd_fault_inject_op *);

u64 nfsd_inject_forget_client_locks(struct nfsd_fault_inject_op *,

				    struct sockaddr_storage *, size_t);

u64 nfsd_inject_forget_locks(struct nfsd_fault_inject_op *, u64);



u64 nfsd_forget_client_openowners(struct nfs4_client *, u64);

u64 nfsd_forget_client_delegations(struct nfs4_client *, u64);

u64 nfsd_recall_client_delegations(struct nfs4_client *, u64);



u64 nfsd_print_client_locks(struct nfs4_client *, u64);

u64 nfsd_print_client_openowners(struct nfs4_client *, u64);

u64 nfsd_print_client_delegations(struct nfs4_client *, u64);

#else /* CONFIG_NFSD_FAULT_INJECTION */