Commit 82e05efa authored by Jeff Layton's avatar Jeff Layton Committed by J. Bruce Fields
Browse files

nfsd: add more granular locking to forget_openowners fault injector 



...instead of relying on the client_mutex.

Also, fix up the printk output that is generated when the file is read.
It currently says that it's reporting the number of open files, but
it's actually reporting the number of openowners.

Signed-off-by: default avatarJeff Layton <jlayton@primarydata.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 016200c3

fs/nfsd/fault_inject.c

+3 −5
Original line number Diff line number Diff line
@@ -146,11 +146,9 @@ static struct nfsd_fault_inject_op inject_ops[] = { 
	},

	{

		.file     = "forget_openowners",

		.get	  = nfsd_inject_get,

		.set_val  = nfsd_inject_set,

		.set_clnt = nfsd_inject_set_client,

		.forget   = nfsd_forget_client_openowners,

		.print    = nfsd_print_client_openowners,

		.get	  = nfsd_inject_print_openowners,

		.set_val  = nfsd_inject_forget_openowners,

		.set_clnt = nfsd_inject_forget_client_openowners,

	},

	{

		.file     = "forget_delegations",

fs/nfsd/nfs4state.c

+114 −8
Original line number Diff line number Diff line
@@ -5965,30 +5965,136 @@ nfsd_inject_forget_locks(struct nfsd_fault_inject_op *op, u64 max) 
	return count;

}



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

static u64

nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,

			      struct list_head *collect,

			      void (*func)(struct nfs4_openowner *))

{

	struct nfs4_openowner *oop, *next;

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

						nfsd_net_id);

	u64 count = 0;



	lockdep_assert_held(&nn->client_lock);



	spin_lock(&clp->cl_lock);

	list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {

		if (func)

		if (func) {

			func(oop);

		if (++count == max)

			if (collect) {

				atomic_inc(&clp->cl_refcount);

				list_add(&oop->oo_perclient, collect);

			}

		}

		++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)

			break;

	}

	spin_unlock(&clp->cl_lock);



	return count;

}



static u64

nfsd_print_client_openowners(struct nfs4_client *clp)

{

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



	nfsd_print_count(clp, count, "openowners");

	return count;

}



static u64

nfsd_collect_client_openowners(struct nfs4_client *clp,

			       struct list_head *collect, u64 max)

{

	return nfsd_foreach_client_openowner(clp, max, collect,

						unhash_openowner_locked);

}



u64

nfsd_inject_print_openowners(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_openowners(clp);

	spin_unlock(&nn->client_lock);



	return count;

}



u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)

static void

nfsd_reap_openowners(struct list_head *reaplist)

{

	return nfsd_foreach_client_open(clp, max, release_openowner);

	struct nfs4_client *clp;

	struct nfs4_openowner *oop, *next;



	list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {

		list_del_init(&oop->oo_perclient);

		clp = oop->oo_owner.so_client;

		release_openowner(oop);

		put_client(clp);

	}

}



u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)

u64

nfsd_inject_forget_client_openowners(struct nfsd_fault_inject_op *op,

				struct sockaddr_storage *addr, size_t addr_size)

{

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

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

	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_openowners(clp, &reaplist, 0);

	spin_unlock(&nn->client_lock);

	nfsd_reap_openowners(&reaplist);

	return count;

}



u64

nfsd_inject_forget_openowners(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_openowners(clp, &reaplist,

							max - count);

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

			break;

	}

	spin_unlock(&nn->client_lock);

	nfsd_reap_openowners(&reaplist);

	return count;

}

fs/nfsd/state.h

+5 −2
Original line number Diff line number Diff line
@@ -488,11 +488,14 @@ 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_inject_print_openowners(struct nfsd_fault_inject_op *);

u64 nfsd_inject_forget_client_openowners(struct nfsd_fault_inject_op *,

					 struct sockaddr_storage *, size_t);

u64 nfsd_inject_forget_openowners(struct nfsd_fault_inject_op *, u64);



u64 nfsd_forget_client_delegations(struct nfs4_client *, u64);

u64 nfsd_recall_client_delegations(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 */

static inline int nfsd_fault_inject_init(void) { return 0; }

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