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nfsd: add more granular locking to *_delegations fault injectors

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...instead of relying on the client_mutex.

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 08:27:23 -04:00 committed by J. Bruce Fields
parent 82e05efaec
commit 98d5c7c5bd
3 changed files with 183 additions and 61 deletions
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16
fs/nfsd/fault_inject.c
View file

@ -152,19 +152,15 @@ static struct nfsd_fault_inject_op inject_ops[] = {
},
{
.file = "forget_delegations",
.get = nfsd_inject_get,
.set_val = nfsd_inject_set,
.set_clnt = nfsd_inject_set_client,
.forget = nfsd_forget_client_delegations,
.print = nfsd_print_client_delegations,
.get = nfsd_inject_print_delegations,
.set_val = nfsd_inject_forget_delegations,
.set_clnt = nfsd_inject_forget_client_delegations,
},
{
.file = "recall_delegations",
.get = nfsd_inject_get,
.set_val = nfsd_inject_set,
.set_clnt = nfsd_inject_set_client,
.forget = nfsd_recall_client_delegations,
.print = nfsd_print_client_delegations,
.get = nfsd_inject_print_delegations,
.set_val = nfsd_inject_recall_delegations,
.set_clnt = nfsd_inject_recall_client_delegations,
},
};

217
fs/nfsd/nfs4state.c
View file

@ -6102,9 +6102,13 @@ static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
struct list_head *victims)
{
struct nfs4_delegation *dp, *next;
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
nfsd_net_id);
u64 count = 0;
lockdep_assert_held(&state_lock);
lockdep_assert_held(&nn->client_lock);
spin_lock(&state_lock);
list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
if (victims) {
/*
@ -6116,70 +6120,189 @@ static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
if (dp->dl_time != 0)
continue;
atomic_inc(&clp->cl_refcount);
unhash_delegation_locked(dp);
list_add(&dp->dl_recall_lru, victims);
}
if (++count == max)
++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(&state_lock);
return count;
}
u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
static u64
nfsd_print_client_delegations(struct nfs4_client *clp)
{
struct nfs4_delegation *dp, *next;
LIST_HEAD(victims);
u64 count;
spin_lock(&state_lock);
count = nfsd_find_all_delegations(clp, max, &victims);
spin_unlock(&state_lock);
list_for_each_entry_safe(dp, next, &victims, dl_recall_lru) {
list_del_init(&dp->dl_recall_lru);
revoke_delegation(dp);
}
return count;
}
u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
{
struct nfs4_delegation *dp;
LIST_HEAD(victims);
u64 count;
spin_lock(&state_lock);
count = nfsd_find_all_delegations(clp, max, &victims);
while (!list_empty(&victims)) {
dp = list_first_entry(&victims, struct nfs4_delegation,
dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
dp->dl_time = 0;
nfsd_break_one_deleg(dp);
}
spin_unlock(&state_lock);
return count;
}
u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
{
u64 count = 0;
spin_lock(&state_lock);
count = nfsd_find_all_delegations(clp, max, NULL);
spin_unlock(&state_lock);
u64 count = nfsd_find_all_delegations(clp, 0, NULL);
nfsd_print_count(clp, count, "delegations");
return count;
}
u64
nfsd_inject_print_delegations(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_delegations(clp);
spin_unlock(&nn->client_lock);
return count;
}
static void
nfsd_forget_delegations(struct list_head *reaplist)
{
struct nfs4_client *clp;
struct nfs4_delegation *dp, *next;
list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
list_del_init(&dp->dl_recall_lru);
clp = dp->dl_stid.sc_client;
revoke_delegation(dp);
put_client(clp);
}
}
u64
nfsd_inject_forget_client_delegations(struct nfsd_fault_inject_op *op,
struct sockaddr_storage *addr, size_t addr_size)
{
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);
clp = nfsd_find_client(addr, addr_size);
if (clp)
count = nfsd_find_all_delegations(clp, 0, &reaplist);
spin_unlock(&nn->client_lock);
nfsd_forget_delegations(&reaplist);
return count;
}
u64
nfsd_inject_forget_delegations(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_find_all_delegations(clp, max - count, &reaplist);
if (max != 0 && count >= max)
break;
}
spin_unlock(&nn->client_lock);
nfsd_forget_delegations(&reaplist);
return count;
}
static void
nfsd_recall_delegations(struct list_head *reaplist)
{
struct nfs4_client *clp;
struct nfs4_delegation *dp, *next;
list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
list_del_init(&dp->dl_recall_lru);
clp = dp->dl_stid.sc_client;
/*
* We skipped all entries that had a zero dl_time before,
* so we can now reset the dl_time back to 0. If a delegation
* break comes in now, then it won't make any difference since
* we're recalling it either way.
*/
spin_lock(&state_lock);
dp->dl_time = 0;
spin_unlock(&state_lock);
nfsd_break_one_deleg(dp);
put_client(clp);
}
}
u64
nfsd_inject_recall_client_delegations(struct nfsd_fault_inject_op *op,
struct sockaddr_storage *addr,
size_t addr_size)
{
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);
clp = nfsd_find_client(addr, addr_size);
if (clp)
count = nfsd_find_all_delegations(clp, 0, &reaplist);
spin_unlock(&nn->client_lock);
nfsd_recall_delegations(&reaplist);
return count;
}
u64
nfsd_inject_recall_delegations(struct nfsd_fault_inject_op *op, u64 max)
{
u64 count = 0;
struct nfs4_client *clp, *next;
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_safe(clp, next, &nn->client_lru, cl_lru) {
count += nfsd_find_all_delegations(clp, max - count, &reaplist);
if (max != 0 && ++count >= max)
break;
}
spin_unlock(&nn->client_lock);
nfsd_recall_delegations(&reaplist);
return count;
}
u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
{
struct nfs4_client *clp, *next;
u64 count = 0;
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
nfsd_net_id);
if (!nfsd_netns_ready(nn))
return 0;

11
fs/nfsd/state.h
View file

@ -493,10 +493,13 @@ 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_delegations(struct nfs4_client *, u64);
u64 nfsd_inject_print_delegations(struct nfsd_fault_inject_op *);
u64 nfsd_inject_forget_client_delegations(struct nfsd_fault_inject_op *,
struct sockaddr_storage *, size_t);
u64 nfsd_inject_forget_delegations(struct nfsd_fault_inject_op *, u64);
u64 nfsd_inject_recall_client_delegations(struct nfsd_fault_inject_op *,
struct sockaddr_storage *, size_t);
u64 nfsd_inject_recall_delegations(struct nfsd_fault_inject_op *, u64);
#else /* CONFIG_NFSD_FAULT_INJECTION */
static inline int nfsd_fault_inject_init(void) { return 0; }
static inline void nfsd_fault_inject_cleanup(void) {}