![Jörn Engel](/assets/img/avatar_default.png)
A reader should spend an extra moment whenever noticing a cast, because either something special is going on that deserves extra attention or, as is all too often the case, the code is wrong. These casts, afaics, have all been useless. They cast a foo* to a foo*, cast a void* to the assigned type, cast a foo* to void*, before assigning it to a void* variable, etc. In a few cases I also removed an additional &...[0], which is equally useless. Lastly I added three FIXMEs where, to the best of my judgement, the code appears to have a bug. It would be good if someone could check these. Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
694 lines
17 KiB
C
694 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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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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struct iblock_hba *ib_host;
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ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL);
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if (!ib_host) {
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pr_err("Unable to allocate memory for"
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" struct iblock_hba\n");
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return -ENOMEM;
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}
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ib_host->iblock_host_id = host_id;
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hba->hba_ptr = ib_host;
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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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pr_debug("CORE_HBA[%d] - Attached iBlock HBA: %u to Generic\n",
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hba->hba_id, ib_host->iblock_host_id);
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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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struct iblock_hba *ib_host = hba->hba_ptr;
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pr_debug("CORE_HBA[%d] - Detached iBlock HBA: %u from Generic"
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" Target Core\n", hba->hba_id, ib_host->iblock_host_id);
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kfree(ib_host);
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hba->hba_ptr = NULL;
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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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struct iblock_hba *ib_host = hba->hba_ptr;
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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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ib_dev->ibd_host = ib_host;
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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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/*
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* These settings need to be made tunable..
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*/
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ib_dev->ibd_bio_set = bioset_create(32, 64);
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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 = queue_max_hw_sectors(q);
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limits->max_sectors = queue_max_sectors(q);
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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;
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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->ib_bio_cnt, 0);
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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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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);
|
|
|
|
bio->bi_bdev = ib_dev->ibd_bd;
|
|
bio->bi_private = task;
|
|
bio->bi_destructor = iblock_bio_destructor;
|
|
bio->bi_end_io = &iblock_bio_done;
|
|
bio->bi_sector = lba;
|
|
atomic_inc(&ib_req->ib_bio_cnt);
|
|
|
|
pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector);
|
|
pr_debug("Set ib_req->ib_bio_cnt: %d\n",
|
|
atomic_read(&ib_req->ib_bio_cnt));
|
|
return bio;
|
|
}
|
|
|
|
static int iblock_do_task(struct se_task *task)
|
|
{
|
|
struct se_cmd *cmd = task->task_se_cmd;
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct bio *bio;
|
|
struct bio_list list;
|
|
struct scatterlist *sg;
|
|
u32 i, sg_num = task->task_sg_nents;
|
|
sector_t block_lba;
|
|
struct blk_plug plug;
|
|
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 = (task->task_lba << 3);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048)
|
|
block_lba = (task->task_lba << 2);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024)
|
|
block_lba = (task->task_lba << 1);
|
|
else if (dev->se_sub_dev->se_dev_attrib.block_size == 512)
|
|
block_lba = task->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);
|
|
|
|
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) {
|
|
bio = iblock_get_bio(task, block_lba, sg_num);
|
|
if (!bio)
|
|
goto fail;
|
|
bio_list_add(&list, bio);
|
|
}
|
|
|
|
/* Always in 512 byte units for Linux/Block */
|
|
block_lba += sg->length >> IBLOCK_LBA_SHIFT;
|
|
sg_num--;
|
|
}
|
|
|
|
blk_start_plug(&plug);
|
|
while ((bio = bio_list_pop(&list)))
|
|
submit_bio(rw, bio);
|
|
blk_finish_plug(&plug);
|
|
|
|
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->ib_bio_cnt))
|
|
return;
|
|
|
|
pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
|
|
task, bio, task->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);
|