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nfsd: add more granular locking to forget_openowners fault injector

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...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: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-07-30 08:27:22 -04:00 committed by J. Bruce Fields
parent 016200c373
commit 82e05efaec
3 changed files with 122 additions and 15 deletions
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8
fs/nfsd/fault_inject.c
View File

@ -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",

122
fs/nfsd/nfs4state.c
View File

@ -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;
}
u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
static u64
nfsd_print_client_openowners(struct nfs4_client *clp)
{
return nfsd_foreach_client_open(clp, max, release_openowner);
u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
nfsd_print_count(clp, count, "openowners");
return count;
}
u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
static u64
nfsd_collect_client_openowners(struct nfs4_client *clp,
struct list_head *collect, u64 max)
{
u64 count = nfsd_foreach_client_open(clp, max, NULL);
nfsd_print_count(clp, count, "open files");
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;
}
static void
nfsd_reap_openowners(struct list_head *reaplist)
{
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_inject_forget_client_openowners(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_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;
}

7
fs/nfsd/state.h
View File

@ -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; }