695 lines
17 KiB
C
695 lines
17 KiB
C
/*******************************************************************************
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* Filename: target_core_iblock.c
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*
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* This file contains the Storage Engine <-> Linux BlockIO transport
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* specific functions.
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*
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* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
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* Copyright (c) 2005, 2006, 2007 SBE, Inc.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.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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* 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 <linux/string.h>
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#include <linux/parser.h>
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#include <linux/timer.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/bio.h>
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#include <linux/genhd.h>
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#include <linux/file.h>
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#include <linux/module.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include "target_core_iblock.h"
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#define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */
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#define IBLOCK_BIO_POOL_SIZE 128
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static struct se_subsystem_api iblock_template;
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static void iblock_bio_done(struct bio *, int);
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/* iblock_attach_hba(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
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{
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pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
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" Generic Target Core Stack %s\n", hba->hba_id,
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IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
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return 0;
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}
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static void iblock_detach_hba(struct se_hba *hba)
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{
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}
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static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
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{
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struct iblock_dev *ib_dev = NULL;
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ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
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if (!ib_dev) {
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pr_err("Unable to allocate struct iblock_dev\n");
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return NULL;
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}
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pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name);
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return ib_dev;
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}
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static struct se_device *iblock_create_virtdevice(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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void *p)
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{
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struct iblock_dev *ib_dev = p;
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struct se_device *dev;
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struct se_dev_limits dev_limits;
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struct block_device *bd = NULL;
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struct request_queue *q;
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struct queue_limits *limits;
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u32 dev_flags = 0;
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int ret = -EINVAL;
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if (!ib_dev) {
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pr_err("Unable to locate struct iblock_dev parameter\n");
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return ERR_PTR(ret);
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}
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memset(&dev_limits, 0, sizeof(struct se_dev_limits));
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ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0);
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if (!ib_dev->ibd_bio_set) {
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pr_err("IBLOCK: Unable to create bioset()\n");
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return ERR_PTR(-ENOMEM);
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}
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pr_debug("IBLOCK: Created bio_set()\n");
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/*
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* iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path
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* must already have been set in order for echo 1 > $HBA/$DEV/enable to run.
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*/
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pr_debug( "IBLOCK: Claiming struct block_device: %s\n",
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ib_dev->ibd_udev_path);
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bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
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FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
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if (IS_ERR(bd)) {
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ret = PTR_ERR(bd);
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goto failed;
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}
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/*
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* Setup the local scope queue_limits from struct request_queue->limits
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* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
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*/
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q = bdev_get_queue(bd);
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limits = &dev_limits.limits;
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limits->logical_block_size = bdev_logical_block_size(bd);
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limits->max_hw_sectors = UINT_MAX;
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limits->max_sectors = UINT_MAX;
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dev_limits.hw_queue_depth = q->nr_requests;
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dev_limits.queue_depth = q->nr_requests;
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ib_dev->ibd_bd = bd;
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dev = transport_add_device_to_core_hba(hba,
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&iblock_template, se_dev, dev_flags, ib_dev,
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&dev_limits, "IBLOCK", IBLOCK_VERSION);
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if (!dev)
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goto failed;
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/*
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* Check if the underlying struct block_device request_queue supports
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* the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
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* in ATA and we need to set TPE=1
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*/
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if (blk_queue_discard(q)) {
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dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count =
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q->limits.max_discard_sectors;
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/*
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* Currently hardcoded to 1 in Linux/SCSI code..
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*/
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dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1;
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dev->se_sub_dev->se_dev_attrib.unmap_granularity =
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q->limits.discard_granularity >> 9;
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dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
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q->limits.discard_alignment;
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pr_debug("IBLOCK: BLOCK Discard support available,"
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" disabled by default\n");
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}
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if (blk_queue_nonrot(q))
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dev->se_sub_dev->se_dev_attrib.is_nonrot = 1;
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return dev;
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failed:
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if (ib_dev->ibd_bio_set) {
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bioset_free(ib_dev->ibd_bio_set);
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ib_dev->ibd_bio_set = NULL;
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}
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ib_dev->ibd_bd = NULL;
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return ERR_PTR(ret);
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}
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static void iblock_free_device(void *p)
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{
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struct iblock_dev *ib_dev = p;
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if (ib_dev->ibd_bd != NULL)
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blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
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if (ib_dev->ibd_bio_set != NULL)
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bioset_free(ib_dev->ibd_bio_set);
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kfree(ib_dev);
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}
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static inline struct iblock_req *IBLOCK_REQ(struct se_task *task)
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{
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return container_of(task, struct iblock_req, ib_task);
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}
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static struct se_task *
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iblock_alloc_task(unsigned char *cdb)
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{
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struct iblock_req *ib_req;
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ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
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if (!ib_req) {
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pr_err("Unable to allocate memory for struct iblock_req\n");
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return NULL;
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}
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atomic_set(&ib_req->pending, 1);
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return &ib_req->ib_task;
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}
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static unsigned long long iblock_emulate_read_cap_with_block_size(
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struct se_device *dev,
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struct block_device *bd,
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struct request_queue *q)
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{
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unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
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bdev_logical_block_size(bd)) - 1);
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u32 block_size = bdev_logical_block_size(bd);
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if (block_size == dev->se_sub_dev->se_dev_attrib.block_size)
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return blocks_long;
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switch (block_size) {
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case 4096:
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switch (dev->se_sub_dev->se_dev_attrib.block_size) {
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case 2048:
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blocks_long <<= 1;
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break;
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case 1024:
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blocks_long <<= 2;
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break;
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case 512:
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blocks_long <<= 3;
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default:
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break;
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}
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break;
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case 2048:
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switch (dev->se_sub_dev->se_dev_attrib.block_size) {
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case 4096:
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blocks_long >>= 1;
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break;
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case 1024:
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blocks_long <<= 1;
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break;
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case 512:
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blocks_long <<= 2;
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break;
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default:
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break;
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}
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break;
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case 1024:
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switch (dev->se_sub_dev->se_dev_attrib.block_size) {
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case 4096:
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blocks_long >>= 2;
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break;
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case 2048:
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blocks_long >>= 1;
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break;
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case 512:
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blocks_long <<= 1;
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break;
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default:
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break;
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}
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break;
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case 512:
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switch (dev->se_sub_dev->se_dev_attrib.block_size) {
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case 4096:
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blocks_long >>= 3;
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break;
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case 2048:
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blocks_long >>= 2;
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break;
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case 1024:
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blocks_long >>= 1;
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return blocks_long;
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}
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static void iblock_end_io_flush(struct bio *bio, int err)
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{
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struct se_cmd *cmd = bio->bi_private;
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if (err)
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pr_err("IBLOCK: cache flush failed: %d\n", err);
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if (cmd)
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transport_complete_sync_cache(cmd, err == 0);
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bio_put(bio);
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}
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/*
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* Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must
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* always flush the whole cache.
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*/
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static void iblock_emulate_sync_cache(struct se_task *task)
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{
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struct se_cmd *cmd = task->task_se_cmd;
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struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
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int immed = (cmd->t_task_cdb[1] & 0x2);
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struct bio *bio;
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/*
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* If the Immediate bit is set, queue up the GOOD response
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* for this SYNCHRONIZE_CACHE op.
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*/
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if (immed)
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transport_complete_sync_cache(cmd, 1);
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bio = bio_alloc(GFP_KERNEL, 0);
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bio->bi_end_io = iblock_end_io_flush;
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bio->bi_bdev = ib_dev->ibd_bd;
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if (!immed)
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bio->bi_private = cmd;
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submit_bio(WRITE_FLUSH, bio);
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}
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static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
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{
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struct iblock_dev *ibd = dev->dev_ptr;
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struct block_device *bd = ibd->ibd_bd;
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int barrier = 0;
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return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
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}
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static void iblock_free_task(struct se_task *task)
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{
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kfree(IBLOCK_REQ(task));
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}
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enum {
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Opt_udev_path, Opt_force, Opt_err
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};
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static match_table_t tokens = {
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{Opt_udev_path, "udev_path=%s"},
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{Opt_force, "force=%d"},
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{Opt_err, NULL}
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};
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static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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const char *page, ssize_t count)
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{
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struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
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char *orig, *ptr, *arg_p, *opts;
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substring_t args[MAX_OPT_ARGS];
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int ret = 0, token;
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opts = kstrdup(page, GFP_KERNEL);
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if (!opts)
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return -ENOMEM;
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orig = opts;
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while ((ptr = strsep(&opts, ",\n")) != NULL) {
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if (!*ptr)
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continue;
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token = match_token(ptr, tokens, args);
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switch (token) {
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case Opt_udev_path:
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if (ib_dev->ibd_bd) {
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pr_err("Unable to set udev_path= while"
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" ib_dev->ibd_bd exists\n");
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ret = -EEXIST;
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goto out;
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}
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arg_p = match_strdup(&args[0]);
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if (!arg_p) {
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ret = -ENOMEM;
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break;
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}
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snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
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"%s", arg_p);
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kfree(arg_p);
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pr_debug("IBLOCK: Referencing UDEV path: %s\n",
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ib_dev->ibd_udev_path);
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ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
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break;
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case Opt_force:
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break;
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default:
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break;
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}
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}
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out:
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kfree(orig);
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return (!ret) ? count : ret;
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}
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static ssize_t iblock_check_configfs_dev_params(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev)
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{
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struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
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if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
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pr_err("Missing udev_path= parameters for IBLOCK\n");
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return -EINVAL;
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}
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return 0;
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}
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static ssize_t iblock_show_configfs_dev_params(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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char *b)
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{
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struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
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struct block_device *bd = ibd->ibd_bd;
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char buf[BDEVNAME_SIZE];
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ssize_t bl = 0;
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if (bd)
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bl += sprintf(b + bl, "iBlock device: %s",
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bdevname(bd, buf));
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if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
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bl += sprintf(b + bl, " UDEV PATH: %s\n",
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ibd->ibd_udev_path);
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} else
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bl += sprintf(b + bl, "\n");
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bl += sprintf(b + bl, " ");
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if (bd) {
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bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
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MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
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"" : (bd->bd_holder == ibd) ?
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"CLAIMED: IBLOCK" : "CLAIMED: OS");
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} else {
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bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
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}
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return bl;
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}
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static void iblock_bio_destructor(struct bio *bio)
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{
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struct se_task *task = bio->bi_private;
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struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
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bio_free(bio, ib_dev->ibd_bio_set);
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}
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static struct bio *
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iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num)
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{
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struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
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struct iblock_req *ib_req = IBLOCK_REQ(task);
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struct bio *bio;
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/*
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* Only allocate as many vector entries as the bio code allows us to,
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* we'll loop later on until we have handled the whole request.
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*/
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if (sg_num > BIO_MAX_PAGES)
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sg_num = BIO_MAX_PAGES;
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bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
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if (!bio) {
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pr_err("Unable to allocate memory for bio\n");
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return NULL;
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}
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pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:"
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" %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set);
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pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size);
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bio->bi_bdev = ib_dev->ibd_bd;
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bio->bi_private = task;
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bio->bi_destructor = iblock_bio_destructor;
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bio->bi_end_io = &iblock_bio_done;
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bio->bi_sector = lba;
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atomic_inc(&ib_req->pending);
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pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector);
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pr_debug("Set ib_req->pending: %d\n", atomic_read(&ib_req->pending));
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return bio;
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}
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static void iblock_submit_bios(struct bio_list *list, int rw)
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{
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struct blk_plug plug;
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struct bio *bio;
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blk_start_plug(&plug);
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while ((bio = bio_list_pop(list)))
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submit_bio(rw, bio);
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blk_finish_plug(&plug);
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}
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static int iblock_do_task(struct se_task *task)
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{
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struct se_cmd *cmd = task->task_se_cmd;
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struct se_device *dev = cmd->se_dev;
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struct iblock_req *ibr = IBLOCK_REQ(task);
|
|
struct bio *bio;
|
|
struct bio_list list;
|
|
struct scatterlist *sg;
|
|
u32 i, sg_num = task->task_sg_nents;
|
|
sector_t block_lba;
|
|
unsigned bio_cnt;
|
|
int rw;
|
|
|
|
if (task->task_data_direction == DMA_TO_DEVICE) {
|
|
/*
|
|
* Force data to disk if we pretend to not have a volatile
|
|
* write cache, or the initiator set the Force Unit Access bit.
|
|
*/
|
|
if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 ||
|
|
(dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
|
|
(cmd->se_cmd_flags & SCF_FUA)))
|
|
rw = WRITE_FUA;
|
|
else
|
|
rw = WRITE;
|
|
} else {
|
|
rw = READ;
|
|
}
|
|
|
|
/*
|
|
* Do starting conversion up from non 512-byte blocksize with
|
|
* struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
|
|
*/
|
|
if (dev->se_sub_dev->se_dev_attrib.block_size == 4096)
|
|
block_lba = (cmd->t_task_lba << 3);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048)
|
|
block_lba = (cmd->t_task_lba << 2);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024)
|
|
block_lba = (cmd->t_task_lba << 1);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 512)
|
|
block_lba = cmd->t_task_lba;
|
|
else {
|
|
pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
|
|
" %u\n", dev->se_sub_dev->se_dev_attrib.block_size);
|
|
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -ENOSYS;
|
|
}
|
|
|
|
bio = iblock_get_bio(task, block_lba, sg_num);
|
|
if (!bio) {
|
|
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bio_list_init(&list);
|
|
bio_list_add(&list, bio);
|
|
bio_cnt = 1;
|
|
|
|
for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
|
|
/*
|
|
* XXX: if the length the device accepts is shorter than the
|
|
* length of the S/G list entry this will cause and
|
|
* endless loop. Better hope no driver uses huge pages.
|
|
*/
|
|
while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
|
|
!= sg->length) {
|
|
if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
|
|
iblock_submit_bios(&list, rw);
|
|
bio_cnt = 0;
|
|
}
|
|
|
|
bio = iblock_get_bio(task, block_lba, sg_num);
|
|
if (!bio)
|
|
goto fail;
|
|
bio_list_add(&list, bio);
|
|
bio_cnt++;
|
|
}
|
|
|
|
/* Always in 512 byte units for Linux/Block */
|
|
block_lba += sg->length >> IBLOCK_LBA_SHIFT;
|
|
sg_num--;
|
|
}
|
|
|
|
iblock_submit_bios(&list, rw);
|
|
|
|
if (atomic_dec_and_test(&ibr->pending)) {
|
|
transport_complete_task(task,
|
|
!atomic_read(&ibr->ib_bio_err_cnt));
|
|
}
|
|
return 0;
|
|
|
|
fail:
|
|
while ((bio = bio_list_pop(&list)))
|
|
bio_put(bio);
|
|
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static u32 iblock_get_device_rev(struct se_device *dev)
|
|
{
|
|
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
|
|
}
|
|
|
|
static u32 iblock_get_device_type(struct se_device *dev)
|
|
{
|
|
return TYPE_DISK;
|
|
}
|
|
|
|
static sector_t iblock_get_blocks(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ibd = dev->dev_ptr;
|
|
struct block_device *bd = ibd->ibd_bd;
|
|
struct request_queue *q = bdev_get_queue(bd);
|
|
|
|
return iblock_emulate_read_cap_with_block_size(dev, bd, q);
|
|
}
|
|
|
|
static void iblock_bio_done(struct bio *bio, int err)
|
|
{
|
|
struct se_task *task = bio->bi_private;
|
|
struct iblock_req *ibr = IBLOCK_REQ(task);
|
|
|
|
/*
|
|
* Set -EIO if !BIO_UPTODATE and the passed is still err=0
|
|
*/
|
|
if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
|
|
err = -EIO;
|
|
|
|
if (err != 0) {
|
|
pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
|
|
" err: %d\n", bio, err);
|
|
/*
|
|
* Bump the ib_bio_err_cnt and release bio.
|
|
*/
|
|
atomic_inc(&ibr->ib_bio_err_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
}
|
|
|
|
bio_put(bio);
|
|
|
|
if (!atomic_dec_and_test(&ibr->pending))
|
|
return;
|
|
|
|
pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
|
|
task, bio, task->task_se_cmd->t_task_lba,
|
|
(unsigned long long)bio->bi_sector, err);
|
|
|
|
transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt));
|
|
}
|
|
|
|
static struct se_subsystem_api iblock_template = {
|
|
.name = "iblock",
|
|
.owner = THIS_MODULE,
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
|
|
.write_cache_emulated = 1,
|
|
.fua_write_emulated = 1,
|
|
.attach_hba = iblock_attach_hba,
|
|
.detach_hba = iblock_detach_hba,
|
|
.allocate_virtdevice = iblock_allocate_virtdevice,
|
|
.create_virtdevice = iblock_create_virtdevice,
|
|
.free_device = iblock_free_device,
|
|
.alloc_task = iblock_alloc_task,
|
|
.do_task = iblock_do_task,
|
|
.do_discard = iblock_do_discard,
|
|
.do_sync_cache = iblock_emulate_sync_cache,
|
|
.free_task = iblock_free_task,
|
|
.check_configfs_dev_params = iblock_check_configfs_dev_params,
|
|
.set_configfs_dev_params = iblock_set_configfs_dev_params,
|
|
.show_configfs_dev_params = iblock_show_configfs_dev_params,
|
|
.get_device_rev = iblock_get_device_rev,
|
|
.get_device_type = iblock_get_device_type,
|
|
.get_blocks = iblock_get_blocks,
|
|
};
|
|
|
|
static int __init iblock_module_init(void)
|
|
{
|
|
return transport_subsystem_register(&iblock_template);
|
|
}
|
|
|
|
static void iblock_module_exit(void)
|
|
{
|
|
transport_subsystem_release(&iblock_template);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
|
|
MODULE_AUTHOR("nab@Linux-iSCSI.org");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(iblock_module_init);
|
|
module_exit(iblock_module_exit);
|