[PATCH v2 03/15] nfsd: make reclaim_str_hashtbl allocated per net

From: Stanislav Kinsbursky
Date: Wed Nov 14 2012 - 10:18:32 EST

This hash holds nfs4_clients info, which are network namespace aware.
So let's make it allocated per network namespace.

Note: this hash is used only by legacy tracker. So let's allocate hash in
tracker init.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
---
fs/nfsd/netns.h | 12 ++++++
fs/nfsd/nfs4recover.c | 100 ++++++++++++++++++++++++++++++++++++++-----------
fs/nfsd/nfs4state.c | 42 +++++++--------------
fs/nfsd/state.h | 12 +++---
4 files changed, 111 insertions(+), 55 deletions(-)

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 65c2431..49e5479 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -24,6 +24,11 @@
#include <net/net_namespace.h>
#include <net/netns/generic.h>

+/* Hash tables for nfs4_clientid state */
+#define CLIENT_HASH_BITS 4
+#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
+#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
+
struct cld_net;

struct nfsd_net {
@@ -38,6 +43,13 @@ struct nfsd_net {
struct lock_manager nfsd4_manager;
bool grace_ended;
time_t boot_time;
+
+ /*
+ * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
+ * used in reboot/reset lease grace period processing
+ */
+ struct list_head *reclaim_str_hashtbl;
+ int reclaim_str_hashtbl_size;
};

extern int nfsd_net_id;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 9881bca..376692a 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -176,6 +176,7 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
struct dentry *dir, *dentry;
struct nfs4_client_reclaim *crp;
int status;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);

dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);

@@ -222,7 +223,7 @@ out_unlock:
mutex_unlock(&dir->d_inode->i_mutex);
if (status == 0) {
if (in_grace) {
- crp = nfs4_client_to_reclaim(dname);
+ crp = nfs4_client_to_reclaim(dname, nn);
if (crp)
crp->cr_clp = clp;
}
@@ -237,7 +238,7 @@ out_unlock:
nfs4_reset_creds(original_cred);
}

-typedef int (recdir_func)(struct dentry *, struct dentry *);
+typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);

struct name_list {
char name[HEXDIR_LEN];
@@ -263,7 +264,7 @@ nfsd4_build_namelist(void *arg, const char *name, int namlen,
}

static int
-nfsd4_list_rec_dir(recdir_func *f)
+nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
{
const struct cred *original_cred;
struct dentry *dir = rec_file->f_path.dentry;
@@ -292,7 +293,7 @@ nfsd4_list_rec_dir(recdir_func *f)
status = PTR_ERR(dentry);
break;
}
- status = f(dir, dentry);
+ status = f(dir, dentry, nn);
dput(dentry);
}
list_del(&entry->list);
@@ -336,6 +337,7 @@ nfsd4_remove_clid_dir(struct nfs4_client *clp)
struct nfs4_client_reclaim *crp;
char dname[HEXDIR_LEN];
int status;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);

if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
return;
@@ -359,9 +361,9 @@ nfsd4_remove_clid_dir(struct nfs4_client *clp)
vfs_fsync(rec_file, 0);
if (in_grace) {
/* remove reclaim record */
- crp = nfsd4_find_reclaim_client(dname);
+ crp = nfsd4_find_reclaim_client(dname, nn);
if (crp)
- nfs4_remove_reclaim_record(crp);
+ nfs4_remove_reclaim_record(crp, nn);
}
}
out_drop_write:
@@ -373,11 +375,11 @@ out:
}

static int
-purge_old(struct dentry *parent, struct dentry *child)
+purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
{
int status;

- if (nfs4_has_reclaimed_state(child->d_name.name))
+ if (nfs4_has_reclaimed_state(child->d_name.name, nn))
return 0;

status = vfs_rmdir(parent->d_inode, child);
@@ -392,6 +394,7 @@ static void
nfsd4_recdir_purge_old(struct net *net, time_t boot_time)
{
int status;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);

in_grace = false;
if (!rec_file)
@@ -399,19 +402,19 @@ nfsd4_recdir_purge_old(struct net *net, time_t boot_time)
status = mnt_want_write_file(rec_file);
if (status)
goto out;
- status = nfsd4_list_rec_dir(purge_old);
+ status = nfsd4_list_rec_dir(purge_old, nn);
if (status == 0)
vfs_fsync(rec_file, 0);
mnt_drop_write_file(rec_file);
out:
- nfs4_release_reclaim();
+ nfs4_release_reclaim(nn);
if (status)
printk("nfsd4: failed to purge old clients from recovery"
" directory %s\n", rec_file->f_path.dentry->d_name.name);
}

static int
-load_recdir(struct dentry *parent, struct dentry *child)
+load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
{
if (child->d_name.len != HEXDIR_LEN - 1) {
printk("nfsd4: illegal name %s in recovery directory\n",
@@ -419,18 +422,19 @@ load_recdir(struct dentry *parent, struct dentry *child)
/* Keep trying; maybe the others are OK: */
return 0;
}
- nfs4_client_to_reclaim(child->d_name.name);
+ nfs4_client_to_reclaim(child->d_name.name, nn);
return 0;
}

static int
-nfsd4_recdir_load(void) {
+nfsd4_recdir_load(struct net *net) {
int status;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);

if (!rec_file)
return 0;

- status = nfsd4_list_rec_dir(load_recdir);
+ status = nfsd4_list_rec_dir(load_recdir, nn);
if (status)
printk("nfsd4: failed loading clients from recovery"
" directory %s\n", rec_file->f_path.dentry->d_name.name);
@@ -474,11 +478,53 @@ nfsd4_init_recdir(void)
return status;
}

+
+static int
+nfs4_legacy_state_init(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ int i;
+
+ nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
+ CLIENT_HASH_SIZE, GFP_KERNEL);
+ if (!nn->reclaim_str_hashtbl)
+ return -ENOMEM;
+
+ for (i = 0; i < CLIENT_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
+ nn->reclaim_str_hashtbl_size = 0;
+
+ return 0;
+}
+
+static void
+nfs4_legacy_state_shutdown(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ kfree(nn->reclaim_str_hashtbl);
+}
+
static int
nfsd4_load_reboot_recovery_data(struct net *net)
{
int status;

+ nfs4_lock_state();
+ status = nfsd4_init_recdir();
+ if (!status)
+ status = nfsd4_recdir_load(net);
+ nfs4_unlock_state();
+ if (status)
+ printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
+ return status;
+}
+
+static int
+nfsd4_legacy_tracking_init(struct net *net)
+{
+ int status;
+
/* XXX: The legacy code won't work in a container */
if (net != &init_net) {
WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
@@ -486,13 +532,17 @@ nfsd4_load_reboot_recovery_data(struct net *net)
return -EINVAL;
}

- nfs4_lock_state();
- status = nfsd4_init_recdir();
- if (!status)
- status = nfsd4_recdir_load();
- nfs4_unlock_state();
+ status = nfs4_legacy_state_init(net);
if (status)
- printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
+ return status;
+
+ status = nfsd4_load_reboot_recovery_data(net);
+ if (status)
+ goto err;
+ return 0;
+
+err:
+ nfs4_legacy_state_shutdown(net);
return status;
}

@@ -508,8 +558,11 @@ nfsd4_shutdown_recdir(void)
static void
nfsd4_legacy_tracking_exit(struct net *net)
{
- nfs4_release_reclaim();
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ nfs4_release_reclaim(nn);
nfsd4_shutdown_recdir();
+ nfs4_legacy_state_shutdown(net);
}

/*
@@ -545,6 +598,7 @@ nfsd4_check_legacy_client(struct nfs4_client *clp)
int status;
char dname[HEXDIR_LEN];
struct nfs4_client_reclaim *crp;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);

/* did we already find that this client is stable? */
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
@@ -557,7 +611,7 @@ nfsd4_check_legacy_client(struct nfs4_client *clp)
}

/* look for it in the reclaim hashtable otherwise */
- crp = nfsd4_find_reclaim_client(dname);
+ crp = nfsd4_find_reclaim_client(dname, nn);
if (crp) {
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
crp->cr_clp = clp;
@@ -568,7 +622,7 @@ nfsd4_check_legacy_client(struct nfs4_client *clp)
}

static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
- .init = nfsd4_load_reboot_recovery_data,
+ .init = nfsd4_legacy_tracking_init,
.exit = nfsd4_legacy_tracking_exit,
.create = nfsd4_create_clid_dir,
.remove = nfsd4_remove_clid_dir,
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9b4df00..58b4870 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -393,11 +393,6 @@ unhash_delegation(struct nfs4_delegation *dp)
/* client_lock protects the client lru list and session hash table */
static DEFINE_SPINLOCK(client_lock);

-/* Hash tables for nfs4_clientid state */
-#define CLIENT_HASH_BITS 4
-#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
-#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
-
static unsigned int clientid_hashval(u32 id)
{
return id & CLIENT_HASH_MASK;
@@ -409,11 +404,8 @@ static unsigned int clientstr_hashval(const char *name)
}

/*
- * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
- * used in reboot/reset lease grace period processing
- *
* conf_id_hashtbl[], and conf_name_tree hold confirmed
- * setclientid_confirmed info.
+ * setclientid_confirmed info.
*
* unconf_id_hashtbl[] and unconf_name_tree hold unconfirmed
* setclientid info.
@@ -426,8 +418,6 @@ static unsigned int clientstr_hashval(const char *name)
*
* All of the above fields are protected by the client_mutex.
*/
-static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
-static int reclaim_str_hashtbl_size = 0;
static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
static struct rb_root conf_name_tree;
@@ -4509,11 +4499,11 @@ alloc_reclaim(void)
}

bool
-nfs4_has_reclaimed_state(const char *name)
+nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp;

- crp = nfsd4_find_reclaim_client(name);
+ crp = nfsd4_find_reclaim_client(name, nn);
return (crp && crp->cr_clp);
}

@@ -4521,7 +4511,7 @@ nfs4_has_reclaimed_state(const char *name)
* failure => all reset bets are off, nfserr_no_grace...
*/
struct nfs4_client_reclaim *
-nfs4_client_to_reclaim(const char *name)
+nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
@@ -4531,42 +4521,42 @@ nfs4_client_to_reclaim(const char *name)
if (crp) {
strhashval = clientstr_hashval(name);
INIT_LIST_HEAD(&crp->cr_strhash);
- list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
+ list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
memcpy(crp->cr_recdir, name, HEXDIR_LEN);
crp->cr_clp = NULL;
- reclaim_str_hashtbl_size++;
+ nn->reclaim_str_hashtbl_size++;
}
return crp;
}

void
-nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp)
+nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
{
list_del(&crp->cr_strhash);
kfree(crp);
- reclaim_str_hashtbl_size--;
+ nn->reclaim_str_hashtbl_size--;
}

void
-nfs4_release_reclaim(void)
+nfs4_release_reclaim(struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp = NULL;
int i;

for (i = 0; i < CLIENT_HASH_SIZE; i++) {
- while (!list_empty(&reclaim_str_hashtbl[i])) {
- crp = list_entry(reclaim_str_hashtbl[i].next,
+ while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
+ crp = list_entry(nn->reclaim_str_hashtbl[i].next,
struct nfs4_client_reclaim, cr_strhash);
- nfs4_remove_reclaim_record(crp);
+ nfs4_remove_reclaim_record(crp, nn);
}
}
- BUG_ON(reclaim_str_hashtbl_size);
+ BUG_ON(nn->reclaim_str_hashtbl_size);
}

/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
struct nfs4_client_reclaim *
-nfsd4_find_reclaim_client(const char *recdir)
+nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
@@ -4574,7 +4564,7 @@ nfsd4_find_reclaim_client(const char *recdir)
dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);

strhashval = clientstr_hashval(recdir);
- list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
+ list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
if (same_name(crp->cr_recdir, recdir)) {
return crp;
}
@@ -4732,7 +4722,6 @@ nfs4_state_init(void)
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
INIT_LIST_HEAD(&conf_id_hashtbl[i]);
INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
- INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
}
conf_name_tree = RB_ROOT;
unconf_name_tree = RB_ROOT;
@@ -4749,7 +4738,6 @@ nfs4_state_init(void)
INIT_LIST_HEAD(&close_lru);
INIT_LIST_HEAD(&client_lru);
INIT_LIST_HEAD(&del_recall_lru);
- reclaim_str_hashtbl_size = 0;
}

/*
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index ca8ee8c..26a912c 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -466,9 +466,10 @@ extern __be32 nfs4_preprocess_stateid_op(struct net *net,
stateid_t *stateid, int flags, struct file **filp);
extern void nfs4_lock_state(void);
extern void nfs4_unlock_state(void);
-void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *);
-extern void nfs4_release_reclaim(void);
-extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir);
+void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
+extern void nfs4_release_reclaim(struct nfsd_net *);
+extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
+ struct nfsd_net *nn);
extern __be32 nfs4_check_open_reclaim(clientid_t *clid, bool sessions);
extern void nfs4_free_openowner(struct nfs4_openowner *);
extern void nfs4_free_lockowner(struct nfs4_lockowner *);
@@ -482,8 +483,9 @@ extern int nfsd4_create_callback_queue(void);
extern void nfsd4_destroy_callback_queue(void);
extern void nfsd4_shutdown_callback(struct nfs4_client *);
extern void nfs4_put_delegation(struct nfs4_delegation *dp);
-extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name);
-extern bool nfs4_has_reclaimed_state(const char *name);
+extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
+ struct nfsd_net *nn);
+extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
extern void release_session_client(struct nfsd4_session *);
extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);


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