![Stephen Kitt](/assets/img/avatar_default.png)
In preparation to enabling -Wvla, remove VLAs and replace them with fixed-length arrays instead. scsi_dh_{alua,emc,rdac} use variable-length array declarations to store command blocks, with the appropriate size as determined by COMMAND_SIZE. This patch replaces these with fixed-sized arrays using MAX_COMMAND_SIZE, so that the array size can be determined at compile time. This was prompted by https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Stephen Kitt <steve@sk2.org> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
835 lines
20 KiB
C
835 lines
20 KiB
C
/*
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* LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
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*
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* Copyright (C) 2005 Mike Christie. All rights reserved.
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* Copyright (C) Chandra Seetharaman, IBM Corp. 2007
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <scsi/scsi.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dh.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#define RDAC_NAME "rdac"
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#define RDAC_RETRY_COUNT 5
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/*
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* LSI mode page stuff
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*
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* These struct definitions and the forming of the
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* mode page were taken from the LSI RDAC 2.4 GPL'd
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* driver, and then converted to Linux conventions.
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*/
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#define RDAC_QUIESCENCE_TIME 20
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/*
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* Page Codes
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*/
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#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
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/*
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* Controller modes definitions
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*/
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#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
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/*
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* RDAC Options field
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*/
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#define RDAC_FORCED_QUIESENCE 0x02
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#define RDAC_TIMEOUT (60 * HZ)
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#define RDAC_RETRIES 3
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struct rdac_mode_6_hdr {
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u8 data_len;
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u8 medium_type;
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u8 device_params;
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u8 block_desc_len;
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};
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struct rdac_mode_10_hdr {
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u16 data_len;
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u8 medium_type;
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u8 device_params;
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u16 reserved;
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u16 block_desc_len;
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};
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struct rdac_mode_common {
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u8 controller_serial[16];
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u8 alt_controller_serial[16];
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u8 rdac_mode[2];
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u8 alt_rdac_mode[2];
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u8 quiescence_timeout;
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u8 rdac_options;
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};
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struct rdac_pg_legacy {
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struct rdac_mode_6_hdr hdr;
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u8 page_code;
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u8 page_len;
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struct rdac_mode_common common;
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#define MODE6_MAX_LUN 32
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u8 lun_table[MODE6_MAX_LUN];
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u8 reserved2[32];
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u8 reserved3;
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u8 reserved4;
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};
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struct rdac_pg_expanded {
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struct rdac_mode_10_hdr hdr;
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u8 page_code;
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u8 subpage_code;
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u8 page_len[2];
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struct rdac_mode_common common;
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u8 lun_table[256];
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u8 reserved3;
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u8 reserved4;
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};
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struct c9_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC9 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "vace" */
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u8 avte_cvp;
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u8 path_prio;
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u8 reserved2[38];
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};
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#define SUBSYS_ID_LEN 16
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#define SLOT_ID_LEN 2
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#define ARRAY_LABEL_LEN 31
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struct c4_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC4 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "subs" */
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u8 subsys_id[SUBSYS_ID_LEN];
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u8 revision[4];
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u8 slot_id[SLOT_ID_LEN];
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u8 reserved[2];
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};
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#define UNIQUE_ID_LEN 16
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struct c8_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC8 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "edid" */
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u8 reserved2[3];
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u8 vol_uniq_id_len;
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u8 vol_uniq_id[16];
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u8 vol_user_label_len;
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u8 vol_user_label[60];
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u8 array_uniq_id_len;
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u8 array_unique_id[UNIQUE_ID_LEN];
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u8 array_user_label_len;
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u8 array_user_label[60];
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u8 lun[8];
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};
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struct rdac_controller {
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u8 array_id[UNIQUE_ID_LEN];
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int use_ms10;
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struct kref kref;
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struct list_head node; /* list of all controllers */
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union {
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struct rdac_pg_legacy legacy;
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struct rdac_pg_expanded expanded;
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} mode_select;
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u8 index;
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u8 array_name[ARRAY_LABEL_LEN];
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struct Scsi_Host *host;
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spinlock_t ms_lock;
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int ms_queued;
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struct work_struct ms_work;
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struct scsi_device *ms_sdev;
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struct list_head ms_head;
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struct list_head dh_list;
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};
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struct c2_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC2 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "swr4" */
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u8 sw_version[3];
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u8 sw_date[3];
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u8 features_enabled;
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u8 max_lun_supported;
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u8 partitions[239]; /* Total allocation length should be 0xFF */
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};
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struct rdac_dh_data {
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struct list_head node;
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struct rdac_controller *ctlr;
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struct scsi_device *sdev;
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#define UNINITIALIZED_LUN (1 << 8)
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unsigned lun;
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#define RDAC_MODE 0
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#define RDAC_MODE_AVT 1
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#define RDAC_MODE_IOSHIP 2
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unsigned char mode;
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#define RDAC_STATE_ACTIVE 0
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#define RDAC_STATE_PASSIVE 1
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unsigned char state;
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#define RDAC_LUN_UNOWNED 0
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#define RDAC_LUN_OWNED 1
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char lun_state;
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#define RDAC_PREFERRED 0
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#define RDAC_NON_PREFERRED 1
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char preferred;
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union {
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struct c2_inquiry c2;
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struct c4_inquiry c4;
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struct c8_inquiry c8;
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struct c9_inquiry c9;
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} inq;
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};
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static const char *mode[] = {
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"RDAC",
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"AVT",
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"IOSHIP",
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};
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static const char *lun_state[] =
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{
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"unowned",
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"owned",
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};
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struct rdac_queue_data {
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struct list_head entry;
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struct rdac_dh_data *h;
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activate_complete callback_fn;
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void *callback_data;
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};
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static LIST_HEAD(ctlr_list);
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static DEFINE_SPINLOCK(list_lock);
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static struct workqueue_struct *kmpath_rdacd;
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static void send_mode_select(struct work_struct *work);
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/*
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* module parameter to enable rdac debug logging.
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* 2 bits for each type of logging, only two types defined for now
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* Can be enhanced if required at later point
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*/
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static int rdac_logging = 1;
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module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
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"Default is 1 - failover logging enabled, "
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"set it to 0xF to enable all the logs");
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#define RDAC_LOG_FAILOVER 0
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#define RDAC_LOG_SENSE 2
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#define RDAC_LOG_BITS 2
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#define RDAC_LOG_LEVEL(SHIFT) \
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((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
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#define RDAC_LOG(SHIFT, sdev, f, arg...) \
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do { \
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if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
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sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
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} while (0);
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static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
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struct list_head *list,
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unsigned char *cdb)
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{
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struct rdac_mode_common *common;
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unsigned data_size;
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struct rdac_queue_data *qdata;
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u8 *lun_table;
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if (ctlr->use_ms10) {
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struct rdac_pg_expanded *rdac_pg;
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data_size = sizeof(struct rdac_pg_expanded);
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rdac_pg = &ctlr->mode_select.expanded;
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memset(rdac_pg, 0, data_size);
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common = &rdac_pg->common;
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rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
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rdac_pg->subpage_code = 0x1;
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rdac_pg->page_len[0] = 0x01;
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rdac_pg->page_len[1] = 0x28;
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lun_table = rdac_pg->lun_table;
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} else {
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struct rdac_pg_legacy *rdac_pg;
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data_size = sizeof(struct rdac_pg_legacy);
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rdac_pg = &ctlr->mode_select.legacy;
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memset(rdac_pg, 0, data_size);
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common = &rdac_pg->common;
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rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
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rdac_pg->page_len = 0x68;
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lun_table = rdac_pg->lun_table;
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}
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common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
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common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
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common->rdac_options = RDAC_FORCED_QUIESENCE;
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list_for_each_entry(qdata, list, entry) {
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lun_table[qdata->h->lun] = 0x81;
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}
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/* Prepare the command. */
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if (ctlr->use_ms10) {
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cdb[0] = MODE_SELECT_10;
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cdb[7] = data_size >> 8;
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cdb[8] = data_size & 0xff;
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} else {
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cdb[0] = MODE_SELECT;
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cdb[4] = data_size;
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}
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return data_size;
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}
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static void release_controller(struct kref *kref)
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{
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struct rdac_controller *ctlr;
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ctlr = container_of(kref, struct rdac_controller, kref);
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list_del(&ctlr->node);
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kfree(ctlr);
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}
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static struct rdac_controller *get_controller(int index, char *array_name,
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u8 *array_id, struct scsi_device *sdev)
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{
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struct rdac_controller *ctlr, *tmp;
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list_for_each_entry(tmp, &ctlr_list, node) {
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if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
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(tmp->index == index) &&
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(tmp->host == sdev->host)) {
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kref_get(&tmp->kref);
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return tmp;
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}
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}
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ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
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if (!ctlr)
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return NULL;
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/* initialize fields of controller */
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memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
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ctlr->index = index;
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ctlr->host = sdev->host;
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memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
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kref_init(&ctlr->kref);
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ctlr->use_ms10 = -1;
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ctlr->ms_queued = 0;
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ctlr->ms_sdev = NULL;
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spin_lock_init(&ctlr->ms_lock);
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INIT_WORK(&ctlr->ms_work, send_mode_select);
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INIT_LIST_HEAD(&ctlr->ms_head);
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list_add(&ctlr->node, &ctlr_list);
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INIT_LIST_HEAD(&ctlr->dh_list);
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return ctlr;
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}
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static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
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char *array_name, u8 *array_id)
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{
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int err = SCSI_DH_IO, i;
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struct c8_inquiry *inqp = &h->inq.c8;
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if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
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sizeof(struct c8_inquiry))) {
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if (inqp->page_code != 0xc8)
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return SCSI_DH_NOSYS;
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if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
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inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
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return SCSI_DH_NOSYS;
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h->lun = inqp->lun[7]; /* Uses only the last byte */
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for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
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*(array_name+i) = inqp->array_user_label[(2*i)+1];
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*(array_name+ARRAY_LABEL_LEN-1) = '\0';
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memset(array_id, 0, UNIQUE_ID_LEN);
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memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
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err = SCSI_DH_OK;
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}
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return err;
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}
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static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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int err = SCSI_DH_IO, access_state;
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struct rdac_dh_data *tmp;
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struct c9_inquiry *inqp = &h->inq.c9;
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h->state = RDAC_STATE_ACTIVE;
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if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
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sizeof(struct c9_inquiry))) {
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/* detect the operating mode */
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if ((inqp->avte_cvp >> 5) & 0x1)
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h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
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else if (inqp->avte_cvp >> 7)
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h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
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else
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h->mode = RDAC_MODE; /* LUN in RDAC mode */
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/* Update ownership */
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if (inqp->avte_cvp & 0x1) {
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h->lun_state = RDAC_LUN_OWNED;
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access_state = SCSI_ACCESS_STATE_OPTIMAL;
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} else {
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h->lun_state = RDAC_LUN_UNOWNED;
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if (h->mode == RDAC_MODE) {
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h->state = RDAC_STATE_PASSIVE;
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access_state = SCSI_ACCESS_STATE_STANDBY;
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} else
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access_state = SCSI_ACCESS_STATE_ACTIVE;
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}
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/* Update path prio*/
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if (inqp->path_prio & 0x1) {
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h->preferred = RDAC_PREFERRED;
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access_state |= SCSI_ACCESS_STATE_PREFERRED;
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} else
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h->preferred = RDAC_NON_PREFERRED;
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rcu_read_lock();
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list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
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/* h->sdev should always be valid */
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BUG_ON(!tmp->sdev);
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tmp->sdev->access_state = access_state;
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}
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rcu_read_unlock();
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err = SCSI_DH_OK;
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}
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return err;
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}
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static int initialize_controller(struct scsi_device *sdev,
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struct rdac_dh_data *h, char *array_name, u8 *array_id)
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{
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int err = SCSI_DH_IO, index;
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struct c4_inquiry *inqp = &h->inq.c4;
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if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
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sizeof(struct c4_inquiry))) {
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/* get the controller index */
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if (inqp->slot_id[1] == 0x31)
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index = 0;
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else
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index = 1;
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spin_lock(&list_lock);
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h->ctlr = get_controller(index, array_name, array_id, sdev);
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if (!h->ctlr)
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err = SCSI_DH_RES_TEMP_UNAVAIL;
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else {
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list_add_rcu(&h->node, &h->ctlr->dh_list);
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h->sdev = sdev;
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}
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spin_unlock(&list_lock);
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err = SCSI_DH_OK;
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}
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return err;
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}
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static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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int err = SCSI_DH_IO;
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struct c2_inquiry *inqp = &h->inq.c2;
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if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
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sizeof(struct c2_inquiry))) {
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/*
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* If more than MODE6_MAX_LUN luns are supported, use
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* mode select 10
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*/
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if (inqp->max_lun_supported >= MODE6_MAX_LUN)
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h->ctlr->use_ms10 = 1;
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else
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h->ctlr->use_ms10 = 0;
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err = SCSI_DH_OK;
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}
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return err;
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}
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static int mode_select_handle_sense(struct scsi_device *sdev,
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struct scsi_sense_hdr *sense_hdr)
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{
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int err = SCSI_DH_IO;
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struct rdac_dh_data *h = sdev->handler_data;
|
|
|
|
if (!scsi_sense_valid(sense_hdr))
|
|
goto done;
|
|
|
|
switch (sense_hdr->sense_key) {
|
|
case NO_SENSE:
|
|
case ABORTED_COMMAND:
|
|
case UNIT_ATTENTION:
|
|
err = SCSI_DH_RETRY;
|
|
break;
|
|
case NOT_READY:
|
|
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
|
|
/* LUN Not Ready and is in the Process of Becoming
|
|
* Ready
|
|
*/
|
|
err = SCSI_DH_RETRY;
|
|
break;
|
|
case ILLEGAL_REQUEST:
|
|
if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
|
|
/*
|
|
* Command Lock contention
|
|
*/
|
|
err = SCSI_DH_IMM_RETRY;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
|
|
"MODE_SELECT returned with sense %02x/%02x/%02x",
|
|
(char *) h->ctlr->array_name, h->ctlr->index,
|
|
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static void send_mode_select(struct work_struct *work)
|
|
{
|
|
struct rdac_controller *ctlr =
|
|
container_of(work, struct rdac_controller, ms_work);
|
|
struct scsi_device *sdev = ctlr->ms_sdev;
|
|
struct rdac_dh_data *h = sdev->handler_data;
|
|
int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
|
|
struct rdac_queue_data *tmp, *qdata;
|
|
LIST_HEAD(list);
|
|
unsigned char cdb[MAX_COMMAND_SIZE];
|
|
struct scsi_sense_hdr sshdr;
|
|
unsigned int data_size;
|
|
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
|
|
REQ_FAILFAST_DRIVER;
|
|
|
|
spin_lock(&ctlr->ms_lock);
|
|
list_splice_init(&ctlr->ms_head, &list);
|
|
ctlr->ms_queued = 0;
|
|
ctlr->ms_sdev = NULL;
|
|
spin_unlock(&ctlr->ms_lock);
|
|
|
|
retry:
|
|
data_size = rdac_failover_get(ctlr, &list, cdb);
|
|
|
|
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
|
|
"%s MODE_SELECT command",
|
|
(char *) h->ctlr->array_name, h->ctlr->index,
|
|
(retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
|
|
|
|
if (scsi_execute(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select,
|
|
data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ,
|
|
RDAC_RETRIES, req_flags, 0, NULL)) {
|
|
err = mode_select_handle_sense(sdev, &sshdr);
|
|
if (err == SCSI_DH_RETRY && retry_cnt--)
|
|
goto retry;
|
|
if (err == SCSI_DH_IMM_RETRY)
|
|
goto retry;
|
|
}
|
|
if (err == SCSI_DH_OK) {
|
|
h->state = RDAC_STATE_ACTIVE;
|
|
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
|
|
"MODE_SELECT completed",
|
|
(char *) h->ctlr->array_name, h->ctlr->index);
|
|
}
|
|
|
|
list_for_each_entry_safe(qdata, tmp, &list, entry) {
|
|
list_del(&qdata->entry);
|
|
if (err == SCSI_DH_OK)
|
|
qdata->h->state = RDAC_STATE_ACTIVE;
|
|
if (qdata->callback_fn)
|
|
qdata->callback_fn(qdata->callback_data, err);
|
|
kfree(qdata);
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int queue_mode_select(struct scsi_device *sdev,
|
|
activate_complete fn, void *data)
|
|
{
|
|
struct rdac_queue_data *qdata;
|
|
struct rdac_controller *ctlr;
|
|
|
|
qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
|
|
if (!qdata)
|
|
return SCSI_DH_RETRY;
|
|
|
|
qdata->h = sdev->handler_data;
|
|
qdata->callback_fn = fn;
|
|
qdata->callback_data = data;
|
|
|
|
ctlr = qdata->h->ctlr;
|
|
spin_lock(&ctlr->ms_lock);
|
|
list_add_tail(&qdata->entry, &ctlr->ms_head);
|
|
if (!ctlr->ms_queued) {
|
|
ctlr->ms_queued = 1;
|
|
ctlr->ms_sdev = sdev;
|
|
queue_work(kmpath_rdacd, &ctlr->ms_work);
|
|
}
|
|
spin_unlock(&ctlr->ms_lock);
|
|
return SCSI_DH_OK;
|
|
}
|
|
|
|
static int rdac_activate(struct scsi_device *sdev,
|
|
activate_complete fn, void *data)
|
|
{
|
|
struct rdac_dh_data *h = sdev->handler_data;
|
|
int err = SCSI_DH_OK;
|
|
int act = 0;
|
|
|
|
err = check_ownership(sdev, h);
|
|
if (err != SCSI_DH_OK)
|
|
goto done;
|
|
|
|
switch (h->mode) {
|
|
case RDAC_MODE:
|
|
if (h->lun_state == RDAC_LUN_UNOWNED)
|
|
act = 1;
|
|
break;
|
|
case RDAC_MODE_IOSHIP:
|
|
if ((h->lun_state == RDAC_LUN_UNOWNED) &&
|
|
(h->preferred == RDAC_PREFERRED))
|
|
act = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (act) {
|
|
err = queue_mode_select(sdev, fn, data);
|
|
if (err == SCSI_DH_OK)
|
|
return 0;
|
|
}
|
|
done:
|
|
if (fn)
|
|
fn(data, err);
|
|
return 0;
|
|
}
|
|
|
|
static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
|
|
{
|
|
struct rdac_dh_data *h = sdev->handler_data;
|
|
int ret = BLKPREP_OK;
|
|
|
|
if (h->state != RDAC_STATE_ACTIVE) {
|
|
ret = BLKPREP_KILL;
|
|
req->rq_flags |= RQF_QUIET;
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int rdac_check_sense(struct scsi_device *sdev,
|
|
struct scsi_sense_hdr *sense_hdr)
|
|
{
|
|
struct rdac_dh_data *h = sdev->handler_data;
|
|
|
|
RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
|
|
"I/O returned with sense %02x/%02x/%02x",
|
|
(char *) h->ctlr->array_name, h->ctlr->index,
|
|
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
|
|
|
|
switch (sense_hdr->sense_key) {
|
|
case NOT_READY:
|
|
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
|
|
/* LUN Not Ready - Logical Unit Not Ready and is in
|
|
* the process of becoming ready
|
|
* Just retry.
|
|
*/
|
|
return ADD_TO_MLQUEUE;
|
|
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
|
|
/* LUN Not Ready - Storage firmware incompatible
|
|
* Manual code synchonisation required.
|
|
*
|
|
* Nothing we can do here. Try to bypass the path.
|
|
*/
|
|
return SUCCESS;
|
|
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
|
|
/* LUN Not Ready - Quiescense in progress
|
|
*
|
|
* Just retry and wait.
|
|
*/
|
|
return ADD_TO_MLQUEUE;
|
|
if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
|
|
/* LUN Not Ready - Quiescense in progress
|
|
* or has been achieved
|
|
* Just retry.
|
|
*/
|
|
return ADD_TO_MLQUEUE;
|
|
break;
|
|
case ILLEGAL_REQUEST:
|
|
if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
|
|
/* Invalid Request - Current Logical Unit Ownership.
|
|
* Controller is not the current owner of the LUN,
|
|
* Fail the path, so that the other path be used.
|
|
*/
|
|
h->state = RDAC_STATE_PASSIVE;
|
|
return SUCCESS;
|
|
}
|
|
break;
|
|
case UNIT_ATTENTION:
|
|
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
|
|
/*
|
|
* Power On, Reset, or Bus Device Reset, just retry.
|
|
*/
|
|
return ADD_TO_MLQUEUE;
|
|
if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
|
|
/*
|
|
* Quiescence in progress , just retry.
|
|
*/
|
|
return ADD_TO_MLQUEUE;
|
|
break;
|
|
}
|
|
/* success just means we do not care what scsi-ml does */
|
|
return SCSI_RETURN_NOT_HANDLED;
|
|
}
|
|
|
|
static int rdac_bus_attach(struct scsi_device *sdev)
|
|
{
|
|
struct rdac_dh_data *h;
|
|
int err;
|
|
char array_name[ARRAY_LABEL_LEN];
|
|
char array_id[UNIQUE_ID_LEN];
|
|
|
|
h = kzalloc(sizeof(*h) , GFP_KERNEL);
|
|
if (!h)
|
|
return SCSI_DH_NOMEM;
|
|
h->lun = UNINITIALIZED_LUN;
|
|
h->state = RDAC_STATE_ACTIVE;
|
|
|
|
err = get_lun_info(sdev, h, array_name, array_id);
|
|
if (err != SCSI_DH_OK)
|
|
goto failed;
|
|
|
|
err = initialize_controller(sdev, h, array_name, array_id);
|
|
if (err != SCSI_DH_OK)
|
|
goto failed;
|
|
|
|
err = check_ownership(sdev, h);
|
|
if (err != SCSI_DH_OK)
|
|
goto clean_ctlr;
|
|
|
|
err = set_mode_select(sdev, h);
|
|
if (err != SCSI_DH_OK)
|
|
goto clean_ctlr;
|
|
|
|
sdev_printk(KERN_NOTICE, sdev,
|
|
"%s: LUN %d (%s) (%s)\n",
|
|
RDAC_NAME, h->lun, mode[(int)h->mode],
|
|
lun_state[(int)h->lun_state]);
|
|
|
|
sdev->handler_data = h;
|
|
return SCSI_DH_OK;
|
|
|
|
clean_ctlr:
|
|
spin_lock(&list_lock);
|
|
kref_put(&h->ctlr->kref, release_controller);
|
|
spin_unlock(&list_lock);
|
|
|
|
failed:
|
|
kfree(h);
|
|
return err;
|
|
}
|
|
|
|
static void rdac_bus_detach( struct scsi_device *sdev )
|
|
{
|
|
struct rdac_dh_data *h = sdev->handler_data;
|
|
|
|
if (h->ctlr && h->ctlr->ms_queued)
|
|
flush_workqueue(kmpath_rdacd);
|
|
|
|
spin_lock(&list_lock);
|
|
if (h->ctlr) {
|
|
list_del_rcu(&h->node);
|
|
h->sdev = NULL;
|
|
kref_put(&h->ctlr->kref, release_controller);
|
|
}
|
|
spin_unlock(&list_lock);
|
|
sdev->handler_data = NULL;
|
|
kfree(h);
|
|
}
|
|
|
|
static struct scsi_device_handler rdac_dh = {
|
|
.name = RDAC_NAME,
|
|
.module = THIS_MODULE,
|
|
.prep_fn = rdac_prep_fn,
|
|
.check_sense = rdac_check_sense,
|
|
.attach = rdac_bus_attach,
|
|
.detach = rdac_bus_detach,
|
|
.activate = rdac_activate,
|
|
};
|
|
|
|
static int __init rdac_init(void)
|
|
{
|
|
int r;
|
|
|
|
r = scsi_register_device_handler(&rdac_dh);
|
|
if (r != 0) {
|
|
printk(KERN_ERR "Failed to register scsi device handler.");
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Create workqueue to handle mode selects for rdac
|
|
*/
|
|
kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
|
|
if (!kmpath_rdacd) {
|
|
scsi_unregister_device_handler(&rdac_dh);
|
|
printk(KERN_ERR "kmpath_rdacd creation failed.\n");
|
|
|
|
r = -EINVAL;
|
|
}
|
|
done:
|
|
return r;
|
|
}
|
|
|
|
static void __exit rdac_exit(void)
|
|
{
|
|
destroy_workqueue(kmpath_rdacd);
|
|
scsi_unregister_device_handler(&rdac_dh);
|
|
}
|
|
|
|
module_init(rdac_init);
|
|
module_exit(rdac_exit);
|
|
|
|
MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
|
|
MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
|
|
MODULE_VERSION("01.00.0000.0000");
|
|
MODULE_LICENSE("GPL");
|