![Christoph Hellwig](/assets/img/avatar_default.png)
Turns out the template and thus many drivers got the return value wrong: 0 means the fabrics driver needs to put a session reference, which no driver except for the iSCSI target drivers did. Fortunately none of these drivers supports explicit Node ACLs, so the bug was harmless. Even without that only qla2xxx and iscsi every did real work in shutdown_session, so get rid of the boilerplate code in all other drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
510 lines
12 KiB
C
510 lines
12 KiB
C
/*******************************************************************************
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* Filename: tcm_fc.c
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*
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* This file contains the configfs implementation for TCM_fc fabric node.
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* Based on tcm_loop_configfs.c
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*
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* Copyright (c) 2010 Cisco Systems, Inc.
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* Copyright (c) 2009,2010 Rising Tide, Inc.
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* Copyright (c) 2009,2010 Linux-iSCSI.org
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*
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* Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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****************************************************************************/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <generated/utsrelease.h>
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#include <linux/utsname.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/configfs.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <asm/unaligned.h>
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#include <scsi/libfc.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "tcm_fc.h"
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static LIST_HEAD(ft_wwn_list);
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DEFINE_MUTEX(ft_lport_lock);
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unsigned int ft_debug_logging;
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module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
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/*
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* Parse WWN.
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* If strict, we require lower-case hex and colon separators to be sure
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* the name is the same as what would be generated by ft_format_wwn()
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* so the name and wwn are mapped one-to-one.
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*/
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static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
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{
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const char *cp;
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char c;
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u32 byte = 0;
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u32 pos = 0;
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u32 err;
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int val;
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*wwn = 0;
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for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
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c = *cp;
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if (c == '\n' && cp[1] == '\0')
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continue;
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if (strict && pos++ == 2 && byte++ < 7) {
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pos = 0;
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if (c == ':')
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continue;
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err = 1;
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goto fail;
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}
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if (c == '\0') {
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err = 2;
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if (strict && byte != 8)
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goto fail;
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return cp - name;
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}
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err = 3;
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val = hex_to_bin(c);
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if (val < 0 || (strict && isupper(c)))
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goto fail;
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*wwn = (*wwn << 4) | val;
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}
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err = 4;
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fail:
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pr_debug("err %u len %zu pos %u byte %u\n",
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err, cp - name, pos, byte);
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return -1;
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}
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ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
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{
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u8 b[8];
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put_unaligned_be64(wwn, b);
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return snprintf(buf, len,
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"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
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b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
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}
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static ssize_t ft_wwn_show(void *arg, char *buf)
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{
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u64 *wwn = arg;
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ssize_t len;
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len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
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buf[len++] = '\n';
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return len;
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}
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static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
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{
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ssize_t ret;
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u64 wwn;
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ret = ft_parse_wwn(buf, &wwn, 0);
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if (ret > 0)
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*(u64 *)arg = wwn;
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return ret;
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}
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/*
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* ACL auth ops.
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*/
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static ssize_t ft_nacl_port_name_show(struct config_item *item, char *page)
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{
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struct se_node_acl *se_nacl = acl_to_nacl(item);
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struct ft_node_acl *acl = container_of(se_nacl,
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struct ft_node_acl, se_node_acl);
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return ft_wwn_show(&acl->node_auth.port_name, page);
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}
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static ssize_t ft_nacl_port_name_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct se_node_acl *se_nacl = acl_to_nacl(item);
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struct ft_node_acl *acl = container_of(se_nacl,
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struct ft_node_acl, se_node_acl);
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return ft_wwn_store(&acl->node_auth.port_name, page, count);
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}
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static ssize_t ft_nacl_node_name_show(struct config_item *item,
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char *page)
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{
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struct se_node_acl *se_nacl = acl_to_nacl(item);
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struct ft_node_acl *acl = container_of(se_nacl,
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struct ft_node_acl, se_node_acl);
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return ft_wwn_show(&acl->node_auth.node_name, page);
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}
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static ssize_t ft_nacl_node_name_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct se_node_acl *se_nacl = acl_to_nacl(item);
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struct ft_node_acl *acl = container_of(se_nacl,
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struct ft_node_acl, se_node_acl);
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return ft_wwn_store(&acl->node_auth.node_name, page, count);
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}
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CONFIGFS_ATTR(ft_nacl_, node_name);
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CONFIGFS_ATTR(ft_nacl_, port_name);
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static ssize_t ft_nacl_tag_show(struct config_item *item,
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char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s", acl_to_nacl(item)->acl_tag);
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}
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static ssize_t ft_nacl_tag_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct se_node_acl *se_nacl = acl_to_nacl(item);
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int ret;
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ret = core_tpg_set_initiator_node_tag(se_nacl->se_tpg, se_nacl, page);
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if (ret < 0)
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return ret;
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return count;
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}
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CONFIGFS_ATTR(ft_nacl_, tag);
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static struct configfs_attribute *ft_nacl_base_attrs[] = {
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&ft_nacl_attr_port_name,
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&ft_nacl_attr_node_name,
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&ft_nacl_attr_tag,
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NULL,
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};
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/*
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* ACL ops.
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*/
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/*
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* Add ACL for an initiator. The ACL is named arbitrarily.
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* The port_name and/or node_name are attributes.
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*/
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static int ft_init_nodeacl(struct se_node_acl *nacl, const char *name)
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{
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struct ft_node_acl *acl =
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container_of(nacl, struct ft_node_acl, se_node_acl);
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u64 wwpn;
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if (ft_parse_wwn(name, &wwpn, 1) < 0)
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return -EINVAL;
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acl->node_auth.port_name = wwpn;
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return 0;
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}
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/*
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* local_port port_group (tpg) ops.
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*/
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static struct se_portal_group *ft_add_tpg(
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struct se_wwn *wwn,
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struct config_group *group,
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const char *name)
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{
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struct ft_lport_wwn *ft_wwn;
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struct ft_tpg *tpg;
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struct workqueue_struct *wq;
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unsigned long index;
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int ret;
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pr_debug("tcm_fc: add tpg %s\n", name);
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/*
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* Name must be "tpgt_" followed by the index.
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*/
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if (strstr(name, "tpgt_") != name)
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return NULL;
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ret = kstrtoul(name + 5, 10, &index);
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if (ret)
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return NULL;
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if (index > UINT_MAX)
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return NULL;
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if ((index != 1)) {
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pr_err("Error, a single TPG=1 is used for HW port mappings\n");
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return ERR_PTR(-ENOSYS);
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}
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ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn);
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tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
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if (!tpg)
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return NULL;
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tpg->index = index;
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tpg->lport_wwn = ft_wwn;
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INIT_LIST_HEAD(&tpg->lun_list);
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wq = alloc_workqueue("tcm_fc", 0, 1);
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if (!wq) {
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kfree(tpg);
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return NULL;
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}
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ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
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if (ret < 0) {
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destroy_workqueue(wq);
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kfree(tpg);
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return NULL;
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}
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tpg->workqueue = wq;
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mutex_lock(&ft_lport_lock);
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ft_wwn->tpg = tpg;
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mutex_unlock(&ft_lport_lock);
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return &tpg->se_tpg;
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}
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static void ft_del_tpg(struct se_portal_group *se_tpg)
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{
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struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
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struct ft_lport_wwn *ft_wwn = tpg->lport_wwn;
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pr_debug("del tpg %s\n",
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config_item_name(&tpg->se_tpg.tpg_group.cg_item));
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destroy_workqueue(tpg->workqueue);
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/* Wait for sessions to be freed thru RCU, for BUG_ON below */
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synchronize_rcu();
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mutex_lock(&ft_lport_lock);
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ft_wwn->tpg = NULL;
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if (tpg->tport) {
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tpg->tport->tpg = NULL;
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tpg->tport = NULL;
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}
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mutex_unlock(&ft_lport_lock);
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core_tpg_deregister(se_tpg);
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kfree(tpg);
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}
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/*
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* Verify that an lport is configured to use the tcm_fc module, and return
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* the target port group that should be used.
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*
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* The caller holds ft_lport_lock.
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*/
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struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
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{
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struct ft_lport_wwn *ft_wwn;
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list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) {
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if (ft_wwn->wwpn == lport->wwpn)
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return ft_wwn->tpg;
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}
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return NULL;
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}
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/*
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* target config instance ops.
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*/
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/*
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* Add lport to allowed config.
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* The name is the WWPN in lower-case ASCII, colon-separated bytes.
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*/
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static struct se_wwn *ft_add_wwn(
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struct target_fabric_configfs *tf,
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struct config_group *group,
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const char *name)
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{
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struct ft_lport_wwn *ft_wwn;
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struct ft_lport_wwn *old_ft_wwn;
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u64 wwpn;
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pr_debug("add wwn %s\n", name);
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if (ft_parse_wwn(name, &wwpn, 1) < 0)
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return NULL;
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ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL);
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if (!ft_wwn)
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return NULL;
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ft_wwn->wwpn = wwpn;
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mutex_lock(&ft_lport_lock);
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list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) {
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if (old_ft_wwn->wwpn == wwpn) {
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mutex_unlock(&ft_lport_lock);
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kfree(ft_wwn);
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return NULL;
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}
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}
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list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list);
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ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn);
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mutex_unlock(&ft_lport_lock);
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return &ft_wwn->se_wwn;
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}
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static void ft_del_wwn(struct se_wwn *wwn)
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{
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struct ft_lport_wwn *ft_wwn = container_of(wwn,
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struct ft_lport_wwn, se_wwn);
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pr_debug("del wwn %s\n", ft_wwn->name);
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mutex_lock(&ft_lport_lock);
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list_del(&ft_wwn->ft_wwn_node);
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mutex_unlock(&ft_lport_lock);
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kfree(ft_wwn);
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}
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static ssize_t ft_wwn_version_show(struct config_item *item, char *page)
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{
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return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
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""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
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}
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CONFIGFS_ATTR_RO(ft_wwn_, version);
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static struct configfs_attribute *ft_wwn_attrs[] = {
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&ft_wwn_attr_version,
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NULL,
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};
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static inline struct ft_tpg *ft_tpg(struct se_portal_group *se_tpg)
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{
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return container_of(se_tpg, struct ft_tpg, se_tpg);
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}
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static char *ft_get_fabric_name(void)
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{
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return "fc";
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}
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static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
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{
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return ft_tpg(se_tpg)->lport_wwn->name;
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}
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static u16 ft_get_tag(struct se_portal_group *se_tpg)
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{
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/*
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* This tag is used when forming SCSI Name identifier in EVPD=1 0x83
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* to represent the SCSI Target Port.
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*/
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return ft_tpg(se_tpg)->index;
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}
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static int ft_check_false(struct se_portal_group *se_tpg)
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{
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return 0;
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}
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static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
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{
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}
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static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
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{
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return ft_tpg(se_tpg)->index;
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}
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static const struct target_core_fabric_ops ft_fabric_ops = {
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.module = THIS_MODULE,
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.name = "fc",
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.node_acl_size = sizeof(struct ft_node_acl),
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.get_fabric_name = ft_get_fabric_name,
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.tpg_get_wwn = ft_get_fabric_wwn,
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.tpg_get_tag = ft_get_tag,
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.tpg_check_demo_mode = ft_check_false,
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.tpg_check_demo_mode_cache = ft_check_false,
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.tpg_check_demo_mode_write_protect = ft_check_false,
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.tpg_check_prod_mode_write_protect = ft_check_false,
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.tpg_get_inst_index = ft_tpg_get_inst_index,
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.check_stop_free = ft_check_stop_free,
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.release_cmd = ft_release_cmd,
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.close_session = ft_sess_close,
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.sess_get_index = ft_sess_get_index,
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.sess_get_initiator_sid = NULL,
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.write_pending = ft_write_pending,
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.write_pending_status = ft_write_pending_status,
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.set_default_node_attributes = ft_set_default_node_attr,
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.get_cmd_state = ft_get_cmd_state,
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.queue_data_in = ft_queue_data_in,
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.queue_status = ft_queue_status,
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.queue_tm_rsp = ft_queue_tm_resp,
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.aborted_task = ft_aborted_task,
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/*
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* Setup function pointers for generic logic in
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* target_core_fabric_configfs.c
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*/
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.fabric_make_wwn = &ft_add_wwn,
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.fabric_drop_wwn = &ft_del_wwn,
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.fabric_make_tpg = &ft_add_tpg,
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.fabric_drop_tpg = &ft_del_tpg,
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.fabric_init_nodeacl = &ft_init_nodeacl,
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.tfc_wwn_attrs = ft_wwn_attrs,
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.tfc_tpg_nacl_base_attrs = ft_nacl_base_attrs,
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};
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static struct notifier_block ft_notifier = {
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.notifier_call = ft_lport_notify
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};
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static int __init ft_init(void)
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{
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int ret;
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ret = target_register_template(&ft_fabric_ops);
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if (ret)
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goto out;
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ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov);
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if (ret)
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goto out_unregister_template;
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blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
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fc_lport_iterate(ft_lport_add, NULL);
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return 0;
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out_unregister_template:
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target_unregister_template(&ft_fabric_ops);
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out:
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return ret;
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}
|
|
|
|
static void __exit ft_exit(void)
|
|
{
|
|
blocking_notifier_chain_unregister(&fc_lport_notifier_head,
|
|
&ft_notifier);
|
|
fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
|
|
fc_lport_iterate(ft_lport_del, NULL);
|
|
target_unregister_template(&ft_fabric_ops);
|
|
synchronize_rcu();
|
|
}
|
|
|
|
MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
module_init(ft_init);
|
|
module_exit(ft_exit);
|