bool net_name_notify;
bool share_name_notify;
bool ip_notify;
+};
- struct cifs_tcon *tcon;
+struct cifs_swn_reg_info {
+ int id;
+ unsigned int ref_count;
+ const char *net_name;
+ const char *share_name;
+ bool net_name_notify;
+ bool share_name_notify;
+ bool ip_notify;
};
+static void cifs_swn_snapshot_reg(struct cifs_swn_reg *swnreg,
+ struct cifs_swn_reg_info *info)
+{
+ info->id = swnreg->id;
+ info->ref_count = kref_read(&swnreg->ref_count);
+ info->net_name = swnreg->net_name;
+ info->share_name = swnreg->share_name;
+ info->net_name_notify = swnreg->net_name_notify;
+ info->share_name_notify = swnreg->share_name_notify;
+ info->ip_notify = swnreg->ip_notify;
+}
+
+static int cifs_swn_dup_reg(struct cifs_swn_reg *swnreg,
+ struct cifs_swn_reg_info *info)
+{
+ cifs_swn_snapshot_reg(swnreg, info);
+
+ info->net_name = kstrdup(swnreg->net_name, GFP_KERNEL);
+ if (!info->net_name)
+ return -ENOMEM;
+
+ info->share_name = kstrdup(swnreg->share_name, GFP_KERNEL);
+ if (!info->share_name) {
+ kfree(info->net_name);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void cifs_swn_free_reg_info(struct cifs_swn_reg_info *info)
+{
+ kfree(info->net_name);
+ kfree(info->share_name);
+}
+
static int cifs_swn_auth_info_krb(struct cifs_tcon *tcon, struct sk_buff *skb)
{
int ret;
* The authentication information to connect to the witness service is bundled
* into the message.
*/
-static int cifs_swn_send_register_message(struct cifs_swn_reg *swnreg)
+static int cifs_swn_send_register_message(struct cifs_swn_reg_info *swnreg,
+ struct cifs_tcon *tcon)
{
struct sk_buff *skb;
struct genlmsghdr *hdr;
* told to switch to it (client move message). In these cases we unregister from the
* server address and register to the new address when we receive the notification.
*/
- if (swnreg->tcon->ses->server->use_swn_dstaddr)
- addr = &swnreg->tcon->ses->server->swn_dstaddr;
+ if (tcon->ses->server->use_swn_dstaddr)
+ addr = &tcon->ses->server->swn_dstaddr;
else
- addr = &swnreg->tcon->ses->server->dstaddr;
+ addr = &tcon->ses->server->dstaddr;
ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage), addr);
if (ret < 0)
goto nlmsg_fail;
}
- authtype = cifs_select_sectype(swnreg->tcon->ses->server, swnreg->tcon->ses->sectype);
+ authtype = cifs_select_sectype(tcon->ses->server, tcon->ses->sectype);
switch (authtype) {
case Kerberos:
- ret = cifs_swn_auth_info_krb(swnreg->tcon, skb);
+ ret = cifs_swn_auth_info_krb(tcon, skb);
if (ret < 0) {
cifs_dbg(VFS, "%s: Failed to get kerberos auth info: %d\n", __func__, ret);
goto nlmsg_fail;
break;
case NTLMv2:
case RawNTLMSSP:
- ret = cifs_swn_auth_info_ntlm(swnreg->tcon, skb);
+ ret = cifs_swn_auth_info_ntlm(tcon, skb);
if (ret < 0) {
cifs_dbg(VFS, "%s: Failed to get NTLM auth info: %d\n", __func__, ret);
goto nlmsg_fail;
/*
* Sends an uregister message to the userspace daemon based on the registration
*/
-static int cifs_swn_send_unregister_message(struct cifs_swn_reg *swnreg)
+static int cifs_swn_send_unregister_message(struct cifs_swn_reg_info *swnreg,
+ struct cifs_tcon *tcon)
{
struct sk_buff *skb;
struct genlmsghdr *hdr;
goto nlmsg_fail;
ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage),
- &swnreg->tcon->ses->server->dstaddr);
+ &tcon->ses->server->dstaddr);
if (ret < 0)
goto nlmsg_fail;
return ret;
}
+/*
+ * Allocation-free mirror of extract_hostname() + extract_sharename() from
+ * fs/smb/client/unc.c. Those helpers kmalloc(GFP_KERNEL); this runs under
+ * cifs_tcp_ses_lock and tcon->tc_lock, both spinlocks, so we mirror their
+ * parsing in place against the caller's stable net_name/share_name strings.
+ * Keep in sync with unc.c.
+ */
+static bool cifs_swn_tcon_matches(struct cifs_tcon *tcon,
+ const char *net_name,
+ const char *share_name)
+{
+ const char *unc = tcon->tree_name;
+ const char *host, *share, *delim;
+ size_t host_len, share_len;
+
+ if (!tcon->use_witness)
+ return false;
+
+ /* extract_hostname: require strlen(unc) >= 3 */
+ if (strnlen(unc, 3) < 3)
+ return false;
+ /* extract_hostname: skip all leading '\' characters */
+ for (host = unc; *host == '\\'; host++)
+ ;
+ if (!*host)
+ return false;
+ delim = strchr(host, '\\');
+ if (!delim)
+ return false;
+ host_len = delim - host;
+ if (strlen(net_name) != host_len ||
+ strncasecmp(host, net_name, host_len))
+ return false;
+
+ /* extract_sharename: start at unc + 2, then first '\' onward */
+ share = unc + 2;
+ delim = strchr(share, '\\');
+ if (!delim)
+ return false;
+ share = delim + 1;
+ share_len = strlen(share);
+
+ return strlen(share_name) == share_len &&
+ !strncasecmp(share, share_name, share_len);
+}
+
+/*
+ * One SWN registration id represents one net/share name pair. Multiple
+ * mounted tcons can therefore share the id. Pick a live representative at
+ * use time instead of caching the first tcon pointer in the registration.
+ */
+static struct cifs_tcon *cifs_swn_get_tcon(struct cifs_swn_reg_info *swnreg)
+{
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+
+ spin_lock(&cifs_tcp_ses_lock);
+ list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+ spin_lock(&tcon->tc_lock);
+ if (tcon->status == TID_EXITING ||
+ !cifs_swn_tcon_matches(tcon, swnreg->net_name,
+ swnreg->share_name)) {
+ spin_unlock(&tcon->tc_lock);
+ continue;
+ }
+ ++tcon->tc_count;
+ trace_smb3_tcon_ref(tcon->debug_id,
+ tcon->tc_count,
+ netfs_trace_tcon_ref_get_swn_notify);
+ spin_unlock(&tcon->tc_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
+ return tcon;
+ }
+ }
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+ return NULL;
+}
+
/*
* Try to find a matching registration for the tcon's server name and share name.
* Calls to this function must be protected by cifs_swnreg_idr_mutex.
reg->net_name_notify = true;
reg->share_name_notify = true;
reg->ip_notify = (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT);
-
- reg->tcon = tcon;
unlock:
mutex_unlock(&cifs_swnreg_idr_mutex);
static void cifs_swn_reg_release(struct kref *ref)
{
struct cifs_swn_reg *swnreg = container_of(ref, struct cifs_swn_reg, ref_count);
- int ret;
-
- ret = cifs_swn_send_unregister_message(swnreg);
- if (ret < 0)
- cifs_dbg(VFS, "%s: Failed to send unregister message: %d\n", __func__, ret);
idr_remove(&cifs_swnreg_idr, swnreg->id);
kfree(swnreg->net_name);
kfree(swnreg);
}
-static void cifs_put_swn_reg(struct cifs_swn_reg *swnreg)
+static void cifs_put_swn_reg_locked(struct cifs_swn_reg *swnreg,
+ struct cifs_tcon *tcon)
{
- mutex_lock(&cifs_swnreg_idr_mutex);
+ if (kref_read(&swnreg->ref_count) == 1) {
+ struct cifs_swn_reg_info swnreg_info;
+ int ret;
+
+ cifs_swn_snapshot_reg(swnreg, &swnreg_info);
+ ret = cifs_swn_send_unregister_message(&swnreg_info, tcon);
+ if (ret < 0)
+ cifs_dbg(VFS, "%s: Failed to send unregister message: %d\n",
+ __func__, ret);
+ }
+
kref_put(&swnreg->ref_count, cifs_swn_reg_release);
- mutex_unlock(&cifs_swnreg_idr_mutex);
}
-static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const char *name, int state)
+static int cifs_swn_resource_state_changed(struct cifs_tcon *tcon, const char *name, int state)
{
switch (state) {
case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE:
cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name);
- cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
+ cifs_signal_cifsd_for_reconnect(tcon->ses->server, true);
break;
case CIFS_SWN_RESOURCE_STATE_AVAILABLE:
cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name);
- cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
+ cifs_signal_cifsd_for_reconnect(tcon->ses->server, true);
break;
case CIFS_SWN_RESOURCE_STATE_UNKNOWN:
cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name);
return ret;
}
-static int cifs_swn_client_move(struct cifs_swn_reg *swnreg, struct sockaddr_storage *addr)
+static int cifs_swn_client_move(struct cifs_tcon *tcon, struct sockaddr_storage *addr)
{
struct sockaddr_in *ipv4 = (struct sockaddr_in *)addr;
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)addr;
else if (addr->ss_family == AF_INET6)
cifs_dbg(FYI, "%s: move to %pI6\n", __func__, &ipv6->sin6_addr);
- return cifs_swn_reconnect(swnreg->tcon, addr);
+ return cifs_swn_reconnect(tcon, addr);
}
int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info)
{
struct cifs_swn_reg *swnreg;
+ struct cifs_swn_reg_info swnreg_info;
+ struct cifs_tcon *tcon;
char name[256];
int type;
+ int ret = 0;
if (info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]) {
int swnreg_id;
swnreg_id = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]);
mutex_lock(&cifs_swnreg_idr_mutex);
swnreg = idr_find(&cifs_swnreg_idr, swnreg_id);
- mutex_unlock(&cifs_swnreg_idr_mutex);
if (swnreg == NULL) {
+ mutex_unlock(&cifs_swnreg_idr_mutex);
cifs_dbg(FYI, "%s: registration id %d not found\n", __func__, swnreg_id);
return -EINVAL;
}
+ ret = cifs_swn_dup_reg(swnreg, &swnreg_info);
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+ if (ret)
+ return ret;
} else {
cifs_dbg(FYI, "%s: missing registration id attribute\n", __func__);
return -EINVAL;
}
+ tcon = cifs_swn_get_tcon(&swnreg_info);
+ if (!tcon) {
+ cifs_dbg(FYI, "%s: registration id %d has no live tcon\n",
+ __func__, swnreg_info.id);
+ ret = -ENODEV;
+ goto free_info;
+ }
+
if (info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]) {
type = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]);
} else {
cifs_dbg(FYI, "%s: missing notification type attribute\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
switch (type) {
sizeof(name));
} else {
cifs_dbg(FYI, "%s: missing resource name attribute\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]) {
state = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]);
} else {
cifs_dbg(FYI, "%s: missing resource state attribute\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return cifs_swn_resource_state_changed(swnreg, name, state);
+ ret = cifs_swn_resource_state_changed(tcon, name, state);
+ break;
}
case CIFS_SWN_NOTIFICATION_CLIENT_MOVE: {
struct sockaddr_storage addr;
nla_memcpy(&addr, info->attrs[CIFS_GENL_ATTR_SWN_IP], sizeof(addr));
} else {
cifs_dbg(FYI, "%s: missing IP address attribute\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return cifs_swn_client_move(swnreg, &addr);
+ ret = cifs_swn_client_move(tcon, &addr);
+ break;
}
default:
cifs_dbg(FYI, "%s: unknown notification type %d\n", __func__, type);
break;
}
- return 0;
+out:
+ cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_swn_notify);
+free_info:
+ cifs_swn_free_reg_info(&swnreg_info);
+ return ret;
}
int cifs_swn_register(struct cifs_tcon *tcon)
{
struct cifs_swn_reg *swnreg;
+ struct cifs_swn_reg_info swnreg_info;
int ret;
swnreg = cifs_get_swn_reg(tcon);
if (IS_ERR(swnreg))
return PTR_ERR(swnreg);
- ret = cifs_swn_send_register_message(swnreg);
+ cifs_swn_snapshot_reg(swnreg, &swnreg_info);
+ ret = cifs_swn_send_register_message(&swnreg_info, tcon);
if (ret < 0) {
cifs_dbg(VFS, "%s: Failed to send swn register message: %d\n", __func__, ret);
/* Do not put the swnreg or return error, the echo task will retry */
return PTR_ERR(swnreg);
}
+ cifs_put_swn_reg_locked(swnreg, tcon);
mutex_unlock(&cifs_swnreg_idr_mutex);
- cifs_put_swn_reg(swnreg);
-
return 0;
}
-void cifs_swn_dump(struct seq_file *m)
+/*
+ * Snapshot one registration under cifs_swnreg_idr_mutex and return. Callers
+ * intentionally do the per-registration network/genlmsg work without the
+ * mutex held, both to keep the critical section short and to avoid nesting
+ * cifs_swnreg_idr_mutex inside the higher tc_lock when a live tcon is then
+ * pinned for the send.
+ */
+static int cifs_swn_get_next_reg_info(int *id, struct cifs_swn_reg_info *info)
{
struct cifs_swn_reg *swnreg;
+ int ret = 0;
+
+ mutex_lock(&cifs_swnreg_idr_mutex);
+ swnreg = idr_get_next(&cifs_swnreg_idr, id);
+ if (swnreg) {
+ ret = cifs_swn_dup_reg(swnreg, info);
+ if (!ret) {
+ *id = swnreg->id + 1;
+ ret = 1;
+ }
+ }
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+
+ return ret;
+}
+
+void cifs_swn_dump(struct seq_file *m)
+{
+ struct cifs_swn_reg_info swnreg_info;
+ struct cifs_tcon *tcon;
struct sockaddr_in *sa;
struct sockaddr_in6 *sa6;
- int id;
+ int id = 0;
+ int ret;
seq_puts(m, "Witness registrations:");
- mutex_lock(&cifs_swnreg_idr_mutex);
- idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
+ while ((ret = cifs_swn_get_next_reg_info(&id, &swnreg_info)) > 0) {
seq_printf(m, "\nId: %u Refs: %u Network name: '%s'%s Share name: '%s'%s Ip address: ",
- id, kref_read(&swnreg->ref_count),
- swnreg->net_name, swnreg->net_name_notify ? "(y)" : "(n)",
- swnreg->share_name, swnreg->share_name_notify ? "(y)" : "(n)");
- switch (swnreg->tcon->ses->server->dstaddr.ss_family) {
+ swnreg_info.id, swnreg_info.ref_count,
+ swnreg_info.net_name, swnreg_info.net_name_notify ? "(y)" : "(n)",
+ swnreg_info.share_name, swnreg_info.share_name_notify ? "(y)" : "(n)");
+
+ tcon = cifs_swn_get_tcon(&swnreg_info);
+ if (!tcon) {
+ seq_puts(m, "(no live tcon)");
+ goto next;
+ }
+
+ switch (tcon->ses->server->dstaddr.ss_family) {
case AF_INET:
- sa = (struct sockaddr_in *) &swnreg->tcon->ses->server->dstaddr;
+ sa = (struct sockaddr_in *)&tcon->ses->server->dstaddr;
seq_printf(m, "%pI4", &sa->sin_addr.s_addr);
break;
case AF_INET6:
- sa6 = (struct sockaddr_in6 *) &swnreg->tcon->ses->server->dstaddr;
+ sa6 = (struct sockaddr_in6 *)&tcon->ses->server->dstaddr;
seq_printf(m, "%pI6", &sa6->sin6_addr.s6_addr);
if (sa6->sin6_scope_id)
seq_printf(m, "%%%u", sa6->sin6_scope_id);
default:
seq_puts(m, "(unknown)");
}
- seq_printf(m, "%s", swnreg->ip_notify ? "(y)" : "(n)");
+ cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_swn_notify);
+next:
+ seq_printf(m, "%s", swnreg_info.ip_notify ? "(y)" : "(n)");
+ cifs_swn_free_reg_info(&swnreg_info);
}
- mutex_unlock(&cifs_swnreg_idr_mutex);
+ if (ret < 0)
+ seq_printf(m, "\nFailed to snapshot witness registration: %d", ret);
seq_puts(m, "\n");
}
void cifs_swn_check(void)
{
- struct cifs_swn_reg *swnreg;
- int id;
+ struct cifs_swn_reg_info swnreg_info;
+ struct cifs_tcon *tcon;
+ int id = 0;
int ret;
- mutex_lock(&cifs_swnreg_idr_mutex);
- idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
- ret = cifs_swn_send_register_message(swnreg);
+ while ((ret = cifs_swn_get_next_reg_info(&id, &swnreg_info)) > 0) {
+ tcon = cifs_swn_get_tcon(&swnreg_info);
+ if (!tcon) {
+ cifs_dbg(FYI, "%s: registration id %d has no live tcon\n",
+ __func__, swnreg_info.id);
+ goto free_info;
+ }
+
+ ret = cifs_swn_send_register_message(&swnreg_info, tcon);
if (ret < 0)
cifs_dbg(FYI, "%s: Failed to send register message: %d\n", __func__, ret);
+ cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_swn_notify);
+free_info:
+ cifs_swn_free_reg_info(&swnreg_info);
}
- mutex_unlock(&cifs_swnreg_idr_mutex);
+ if (ret < 0)
+ cifs_dbg(FYI, "%s: Failed to snapshot registration: %d\n", __func__, ret);
}
projects / thirdparty / kernel / linux.git / commitdiff
