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![Linus Torvalds](/assets/img/avatar_default.png)
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (55 commits) [SCSI] tcm_loop: Add multi-fabric Linux/SCSI LLD fabric module [SCSI] qla4xxx: Use polling mode for disable interrupt mailbox completion [SCSI] Revert "[SCSI] Retrieve the Caching mode page" [SCSI] bnx2fc: IO completion not processed due to missed wakeup [SCSI] qla4xxx: Update driver version to 5.02.00-k6 [SCSI] qla4xxx: masking required bits of add_fw_options during initialization [SCSI] qla4xxx: added new function qla4xxx_relogin_all_devices [SCSI] qla4xxx: add support for ql4xsess_recovery_tmo cmd line param [SCSI] qla4xxx: Add support for ql4xmaxqdepth command line parameter [SCSI] qla4xxx: cleanup function qla4xxx_process_ddb_changed [SCSI] qla4xxx: Prevent other port reinitialization during remove_adapter [SCSI] qla4xxx: remove unused ddb flag DF_NO_RELOGIN [SCSI] qla4xxx: cleanup DDB relogin logic during initialization [SCSI] qla4xxx: Do not retry ISP82XX initialization if H/W state is failed [SCSI] qla4xxx: Do not send mbox command if FW is in failed state [SCSI] qla4xxx: cleanup qla4xxx_initialize_ddb_list() [SCSI] ses: add subenclosure support [SCSI] bnx2fc: Bump version to 1.0.1 [SCSI] bnx2fc: Remove unnecessary module state checks [SCSI] bnx2fc: Fix MTU issue by using static MTU ...
814 lines
20 KiB
C
814 lines
20 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/version.h>
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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 <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_device.h>
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#include <target/target_core_transport.h>
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#include "target_core_iblock.h"
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#if 0
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#define DEBUG_IBLOCK(x...) printk(x)
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#else
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#define DEBUG_IBLOCK(x...)
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#endif
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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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printk(KERN_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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atomic_set(&hba->left_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
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atomic_set(&hba->max_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
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hba->hba_ptr = (void *) ib_host;
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printk(KERN_INFO "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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printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic"
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" Target Core TCQ Depth: %d\n", hba->hba_id,
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ib_host->iblock_host_id, atomic_read(&hba->max_queue_depth));
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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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printk(KERN_INFO "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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printk(KERN_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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printk(KERN_INFO "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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printk(KERN_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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printk(KERN_ERR "IBLOCK: Unable to create bioset()\n");
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return ERR_PTR(-ENOMEM);
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}
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printk(KERN_INFO "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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printk(KERN_INFO "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 = IBLOCK_MAX_DEVICE_QUEUE_DEPTH;
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dev_limits.queue_depth = IBLOCK_DEVICE_QUEUE_DEPTH;
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ib_dev->ibd_major = MAJOR(bd->bd_dev);
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ib_dev->ibd_minor = MINOR(bd->bd_dev);
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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, (void *)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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ib_dev->ibd_depth = dev->queue_depth;
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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_ATTRIB(dev)->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_ATTRIB(dev)->max_unmap_block_desc_count = 1;
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DEV_ATTRIB(dev)->unmap_granularity =
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q->limits.discard_granularity;
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DEV_ATTRIB(dev)->unmap_granularity_alignment =
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q->limits.discard_alignment;
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printk(KERN_INFO "IBLOCK: BLOCK Discard support available,"
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" disabled by default\n");
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}
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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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ib_dev->ibd_major = 0;
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ib_dev->ibd_minor = 0;
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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(struct se_cmd *cmd)
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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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printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n");
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return NULL;
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}
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ib_req->ib_dev = SE_DEV(cmd)->dev_ptr;
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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_ATTRIB(dev)->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_ATTRIB(dev)->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_ATTRIB(dev)->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_ATTRIB(dev)->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_ATTRIB(dev)->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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/*
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* Emulate SYCHRONIZE_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_CMD(task);
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struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
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int immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2);
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sector_t error_sector;
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int ret;
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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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/*
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* blkdev_issue_flush() does not support a specifying a range, so
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* we have to flush the entire cache.
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*/
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ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector);
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if (ret != 0) {
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printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d "
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" error_sector: %llu\n", ret,
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(unsigned long long)error_sector);
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}
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if (!immed)
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transport_complete_sync_cache(cmd, ret == 0);
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}
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/*
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* Tell TCM Core that we are capable of WriteCache emulation for
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* an underlying struct se_device.
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*/
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static int iblock_emulated_write_cache(struct se_device *dev)
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{
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return 1;
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}
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static int iblock_emulated_dpo(struct se_device *dev)
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{
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return 0;
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}
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/*
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* Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
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* for TYPE_DISK.
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*/
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static int iblock_emulated_fua_write(struct se_device *dev)
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{
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return 1;
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}
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static int iblock_emulated_fua_read(struct se_device *dev)
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{
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return 0;
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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_device *dev = task->task_se_cmd->se_dev;
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struct iblock_req *req = IBLOCK_REQ(task);
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struct bio *bio = req->ib_bio, *nbio = NULL;
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struct blk_plug plug;
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int rw;
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if (task->task_data_direction == DMA_TO_DEVICE) {
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/*
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* Force data to disk if we pretend to not have a volatile
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* write cache, or the initiator set the Force Unit Access bit.
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*/
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if (DEV_ATTRIB(dev)->emulate_write_cache == 0 ||
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(DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
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T_TASK(task->task_se_cmd)->t_tasks_fua))
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rw = WRITE_FUA;
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else
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rw = WRITE;
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} else {
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rw = READ;
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}
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blk_start_plug(&plug);
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while (bio) {
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nbio = bio->bi_next;
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bio->bi_next = NULL;
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DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p"
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" bio->bi_sector: %llu\n", task, bio, bio->bi_sector);
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submit_bio(rw, bio);
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bio = nbio;
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}
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blk_finish_plug(&plug);
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return PYX_TRANSPORT_SENT_TO_TRANSPORT;
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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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struct iblock_req *req = IBLOCK_REQ(task);
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struct bio *bio, *hbio = req->ib_bio;
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/*
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* We only release the bio(s) here if iblock_bio_done() has not called
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* bio_put() -> iblock_bio_destructor().
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*/
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while (hbio != NULL) {
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bio = hbio;
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hbio = hbio->bi_next;
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bio->bi_next = NULL;
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bio_put(bio);
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}
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kfree(req);
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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, arg, 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, ",")) != NULL) {
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if (!*ptr)
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continue;
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token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_udev_path:
|
|
if (ib_dev->ibd_bd) {
|
|
printk(KERN_ERR "Unable to set udev_path= while"
|
|
" ib_dev->ibd_bd exists\n");
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
|
|
"%s", arg_p);
|
|
kfree(arg_p);
|
|
printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n",
|
|
ib_dev->ibd_udev_path);
|
|
ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
|
|
break;
|
|
case Opt_force:
|
|
match_int(args, &arg);
|
|
ib_dev->ibd_force = arg;
|
|
printk(KERN_INFO "IBLOCK: Set force=%d\n",
|
|
ib_dev->ibd_force);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t iblock_check_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev)
|
|
{
|
|
struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
|
|
|
|
if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
|
|
printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t iblock_show_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
char *b)
|
|
{
|
|
struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
|
|
struct block_device *bd = ibd->ibd_bd;
|
|
char buf[BDEVNAME_SIZE];
|
|
ssize_t bl = 0;
|
|
|
|
if (bd)
|
|
bl += sprintf(b + bl, "iBlock device: %s",
|
|
bdevname(bd, buf));
|
|
if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
|
|
bl += sprintf(b + bl, " UDEV PATH: %s\n",
|
|
ibd->ibd_udev_path);
|
|
} else
|
|
bl += sprintf(b + bl, "\n");
|
|
|
|
bl += sprintf(b + bl, " ");
|
|
if (bd) {
|
|
bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
|
|
ibd->ibd_major, ibd->ibd_minor, (!bd->bd_contains) ?
|
|
"" : (bd->bd_holder == (struct iblock_dev *)ibd) ?
|
|
"CLAIMED: IBLOCK" : "CLAIMED: OS");
|
|
} else {
|
|
bl += sprintf(b + bl, "Major: %d Minor: %d\n",
|
|
ibd->ibd_major, ibd->ibd_minor);
|
|
}
|
|
|
|
return bl;
|
|
}
|
|
|
|
static void iblock_bio_destructor(struct bio *bio)
|
|
{
|
|
struct se_task *task = bio->bi_private;
|
|
struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
|
|
|
|
bio_free(bio, ib_dev->ibd_bio_set);
|
|
}
|
|
|
|
static struct bio *iblock_get_bio(
|
|
struct se_task *task,
|
|
struct iblock_req *ib_req,
|
|
struct iblock_dev *ib_dev,
|
|
int *ret,
|
|
sector_t lba,
|
|
u32 sg_num)
|
|
{
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
|
|
if (!(bio)) {
|
|
printk(KERN_ERR "Unable to allocate memory for bio\n");
|
|
*ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
|
|
return NULL;
|
|
}
|
|
|
|
DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:"
|
|
" %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set);
|
|
DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size);
|
|
|
|
bio->bi_bdev = ib_dev->ibd_bd;
|
|
bio->bi_private = (void *) 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);
|
|
|
|
DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector);
|
|
DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n",
|
|
atomic_read(&ib_req->ib_bio_cnt));
|
|
return bio;
|
|
}
|
|
|
|
static int iblock_map_task_SG(struct se_task *task)
|
|
{
|
|
struct se_cmd *cmd = task->task_se_cmd;
|
|
struct se_device *dev = SE_DEV(cmd);
|
|
struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
|
|
struct iblock_req *ib_req = IBLOCK_REQ(task);
|
|
struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
|
|
struct scatterlist *sg;
|
|
int ret = 0;
|
|
u32 i, sg_num = task->task_sg_num;
|
|
sector_t block_lba;
|
|
/*
|
|
* Do starting conversion up from non 512-byte blocksize with
|
|
* struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
|
|
*/
|
|
if (DEV_ATTRIB(dev)->block_size == 4096)
|
|
block_lba = (task->task_lba << 3);
|
|
else if (DEV_ATTRIB(dev)->block_size == 2048)
|
|
block_lba = (task->task_lba << 2);
|
|
else if (DEV_ATTRIB(dev)->block_size == 1024)
|
|
block_lba = (task->task_lba << 1);
|
|
else if (DEV_ATTRIB(dev)->block_size == 512)
|
|
block_lba = task->task_lba;
|
|
else {
|
|
printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:"
|
|
" %u\n", DEV_ATTRIB(dev)->block_size);
|
|
return PYX_TRANSPORT_LU_COMM_FAILURE;
|
|
}
|
|
|
|
bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num);
|
|
if (!(bio))
|
|
return ret;
|
|
|
|
ib_req->ib_bio = bio;
|
|
hbio = tbio = bio;
|
|
/*
|
|
* Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist
|
|
* from TCM struct se_mem -> task->task_sg -> struct scatterlist memory.
|
|
*/
|
|
for_each_sg(task->task_sg, sg, task->task_sg_num, i) {
|
|
DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:"
|
|
" %p len: %u offset: %u\n", task, bio, sg_page(sg),
|
|
sg->length, sg->offset);
|
|
again:
|
|
ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset);
|
|
if (ret != sg->length) {
|
|
|
|
DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n",
|
|
bio->bi_sector);
|
|
DEBUG_IBLOCK("** task->task_size: %u\n",
|
|
task->task_size);
|
|
DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n",
|
|
bio->bi_max_vecs);
|
|
DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n",
|
|
bio->bi_vcnt);
|
|
|
|
bio = iblock_get_bio(task, ib_req, ib_dev, &ret,
|
|
block_lba, sg_num);
|
|
if (!(bio))
|
|
goto fail;
|
|
|
|
tbio = tbio->bi_next = bio;
|
|
DEBUG_IBLOCK("-----------------> Added +1 bio: %p to"
|
|
" list, Going to again\n", bio);
|
|
goto again;
|
|
}
|
|
/* Always in 512 byte units for Linux/Block */
|
|
block_lba += sg->length >> IBLOCK_LBA_SHIFT;
|
|
sg_num--;
|
|
DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented"
|
|
" sg_num to %u\n", task, sg_num);
|
|
DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba"
|
|
" to %llu\n", task, block_lba);
|
|
DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:"
|
|
" %u\n", task, bio->bi_vcnt);
|
|
}
|
|
|
|
return 0;
|
|
fail:
|
|
while (hbio) {
|
|
bio = hbio;
|
|
hbio = hbio->bi_next;
|
|
bio->bi_next = NULL;
|
|
bio_put(bio);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static unsigned char *iblock_get_cdb(struct se_task *task)
|
|
{
|
|
return IBLOCK_REQ(task)->ib_scsi_cdb;
|
|
}
|
|
|
|
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) {
|
|
printk(KERN_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);
|
|
/*
|
|
* Wait to complete the task until the last bio as completed.
|
|
*/
|
|
if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
|
|
return;
|
|
|
|
ibr->ib_bio = NULL;
|
|
transport_complete_task(task, 0);
|
|
return;
|
|
}
|
|
DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
|
|
task, bio, task->task_lba, bio->bi_sector, err);
|
|
/*
|
|
* bio_put() will call iblock_bio_destructor() to release the bio back
|
|
* to ibr->ib_bio_set.
|
|
*/
|
|
bio_put(bio);
|
|
/*
|
|
* Wait to complete the task until the last bio as completed.
|
|
*/
|
|
if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
|
|
return;
|
|
/*
|
|
* Return GOOD status for task if zero ib_bio_err_cnt exists.
|
|
*/
|
|
ibr->ib_bio = NULL;
|
|
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,
|
|
.map_task_SG = iblock_map_task_SG,
|
|
.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,
|
|
.dpo_emulated = iblock_emulated_dpo,
|
|
.fua_write_emulated = iblock_emulated_fua_write,
|
|
.fua_read_emulated = iblock_emulated_fua_read,
|
|
.write_cache_emulated = iblock_emulated_write_cache,
|
|
.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_cdb = iblock_get_cdb,
|
|
.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);
|