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4e857c58ef
Mostly scripted conversion of the smp_mb__* barriers. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-55dhyhocezdw1dg7u19hmh1u@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-arch@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
900 lines
21 KiB
C
900 lines
21 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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* (c) Copyright 2003-2013 Datera, Inc.
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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 <asm/unaligned.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 inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
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{
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return container_of(dev, struct iblock_dev, dev);
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}
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static struct se_subsystem_api iblock_template;
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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 struct se_device *iblock_alloc_device(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->dev;
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}
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static int iblock_configure_device(struct se_device *dev)
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{
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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struct request_queue *q;
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struct block_device *bd = NULL;
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struct blk_integrity *bi;
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fmode_t mode;
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int ret = -ENOMEM;
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if (!(ib_dev->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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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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goto out;
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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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mode = FMODE_READ|FMODE_EXCL;
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if (!ib_dev->ibd_readonly)
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mode |= FMODE_WRITE;
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bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
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if (IS_ERR(bd)) {
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ret = PTR_ERR(bd);
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goto out_free_bioset;
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}
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ib_dev->ibd_bd = bd;
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q = bdev_get_queue(bd);
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dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd);
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dev->dev_attrib.hw_max_sectors = UINT_MAX;
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dev->dev_attrib.hw_queue_depth = q->nr_requests;
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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->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->dev_attrib.max_unmap_block_desc_count = 1;
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dev->dev_attrib.unmap_granularity =
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q->limits.discard_granularity >> 9;
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dev->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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/*
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* Enable write same emulation for IBLOCK and use 0xFFFF as
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* the smaller WRITE_SAME(10) only has a two-byte block count.
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*/
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dev->dev_attrib.max_write_same_len = 0xFFFF;
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if (blk_queue_nonrot(q))
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dev->dev_attrib.is_nonrot = 1;
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bi = bdev_get_integrity(bd);
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if (bi) {
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struct bio_set *bs = ib_dev->ibd_bio_set;
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if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") ||
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!strcmp(bi->name, "T10-DIF-TYPE1-IP")) {
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pr_err("IBLOCK export of blk_integrity: %s not"
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" supported\n", bi->name);
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ret = -ENOSYS;
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goto out_blkdev_put;
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}
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if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) {
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dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT;
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} else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) {
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dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT;
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}
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if (dev->dev_attrib.pi_prot_type) {
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if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) {
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pr_err("Unable to allocate bioset for PI\n");
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ret = -ENOMEM;
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goto out_blkdev_put;
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}
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pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n",
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bs->bio_integrity_pool);
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}
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dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type;
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}
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return 0;
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out_blkdev_put:
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blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
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out_free_bioset:
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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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out:
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return ret;
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}
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static void iblock_free_device(struct se_device *dev)
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{
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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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 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->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->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->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->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->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_complete_cmd(struct se_cmd *cmd)
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{
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struct iblock_req *ibr = cmd->priv;
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u8 status;
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if (!atomic_dec_and_test(&ibr->pending))
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return;
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if (atomic_read(&ibr->ib_bio_err_cnt))
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status = SAM_STAT_CHECK_CONDITION;
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else
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status = SAM_STAT_GOOD;
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target_complete_cmd(cmd, status);
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kfree(ibr);
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}
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static void iblock_bio_done(struct bio *bio, int err)
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{
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struct se_cmd *cmd = bio->bi_private;
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struct iblock_req *ibr = cmd->priv;
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/*
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* Set -EIO if !BIO_UPTODATE and the passed is still err=0
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*/
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if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
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err = -EIO;
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if (err != 0) {
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pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
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" err: %d\n", bio, err);
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/*
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* Bump the ib_bio_err_cnt and release bio.
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*/
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atomic_inc(&ibr->ib_bio_err_cnt);
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smp_mb__after_atomic();
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}
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bio_put(bio);
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iblock_complete_cmd(cmd);
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}
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static struct bio *
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iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
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{
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struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
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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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bio->bi_bdev = ib_dev->ibd_bd;
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bio->bi_private = cmd;
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bio->bi_end_io = &iblock_bio_done;
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bio->bi_iter.bi_sector = lba;
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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 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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if (err)
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target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
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else
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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}
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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 sense_reason_t
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iblock_execute_sync_cache(struct se_cmd *cmd)
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{
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struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
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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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target_complete_cmd(cmd, SAM_STAT_GOOD);
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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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return 0;
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}
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static sense_reason_t
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iblock_do_unmap(struct se_cmd *cmd, void *priv,
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sector_t lba, sector_t nolb)
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{
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struct block_device *bdev = priv;
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int ret;
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ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
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if (ret < 0) {
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pr_err("blkdev_issue_discard() failed: %d\n", ret);
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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return 0;
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}
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static sense_reason_t
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iblock_execute_unmap(struct se_cmd *cmd)
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{
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struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
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return sbc_execute_unmap(cmd, iblock_do_unmap, bdev);
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}
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static sense_reason_t
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iblock_execute_write_same_unmap(struct se_cmd *cmd)
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{
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struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
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sector_t lba = cmd->t_task_lba;
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sector_t nolb = sbc_get_write_same_sectors(cmd);
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int ret;
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ret = iblock_do_unmap(cmd, bdev, lba, nolb);
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if (ret)
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return ret;
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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static sense_reason_t
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iblock_execute_write_same(struct se_cmd *cmd)
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{
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struct iblock_req *ibr;
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struct scatterlist *sg;
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struct bio *bio;
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struct bio_list list;
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sector_t block_lba = cmd->t_task_lba;
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sector_t sectors = sbc_get_write_same_sectors(cmd);
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sg = &cmd->t_data_sg[0];
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if (cmd->t_data_nents > 1 ||
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sg->length != cmd->se_dev->dev_attrib.block_size) {
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pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
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" block_size: %u\n", cmd->t_data_nents, sg->length,
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cmd->se_dev->dev_attrib.block_size);
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return TCM_INVALID_CDB_FIELD;
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}
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ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
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if (!ibr)
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goto fail;
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cmd->priv = ibr;
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bio = iblock_get_bio(cmd, block_lba, 1);
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if (!bio)
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goto fail_free_ibr;
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bio_list_init(&list);
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bio_list_add(&list, bio);
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atomic_set(&ibr->pending, 1);
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while (sectors) {
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while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
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!= sg->length) {
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bio = iblock_get_bio(cmd, block_lba, 1);
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if (!bio)
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goto fail_put_bios;
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atomic_inc(&ibr->pending);
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bio_list_add(&list, bio);
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}
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/* Always in 512 byte units for Linux/Block */
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block_lba += sg->length >> IBLOCK_LBA_SHIFT;
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sectors -= 1;
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}
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iblock_submit_bios(&list, WRITE);
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return 0;
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fail_put_bios:
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while ((bio = bio_list_pop(&list)))
|
|
bio_put(bio);
|
|
fail_free_ibr:
|
|
kfree(ibr);
|
|
fail:
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
enum {
|
|
Opt_udev_path, Opt_readonly, Opt_force, Opt_err
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_udev_path, "udev_path=%s"},
|
|
{Opt_readonly, "readonly=%d"},
|
|
{Opt_force, "force=%d"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
|
|
const char *page, ssize_t count)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
char *orig, *ptr, *arg_p, *opts;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int ret = 0, token;
|
|
unsigned long tmp_readonly;
|
|
|
|
opts = kstrdup(page, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
|
|
orig = opts;
|
|
|
|
while ((ptr = strsep(&opts, ",\n")) != NULL) {
|
|
if (!*ptr)
|
|
continue;
|
|
|
|
token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_udev_path:
|
|
if (ib_dev->ibd_bd) {
|
|
pr_err("Unable to set udev_path= while"
|
|
" ib_dev->ibd_bd exists\n");
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
|
|
SE_UDEV_PATH_LEN) == 0) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
pr_debug("IBLOCK: Referencing UDEV path: %s\n",
|
|
ib_dev->ibd_udev_path);
|
|
ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
|
|
break;
|
|
case Opt_readonly:
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = kstrtoul(arg_p, 0, &tmp_readonly);
|
|
kfree(arg_p);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed for"
|
|
" readonly=\n");
|
|
goto out;
|
|
}
|
|
ib_dev->ibd_readonly = tmp_readonly;
|
|
pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
|
|
break;
|
|
case Opt_force:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
char buf[BDEVNAME_SIZE];
|
|
ssize_t bl = 0;
|
|
|
|
if (bd)
|
|
bl += sprintf(b + bl, "iBlock device: %s",
|
|
bdevname(bd, buf));
|
|
if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
|
|
bl += sprintf(b + bl, " UDEV PATH: %s",
|
|
ib_dev->ibd_udev_path);
|
|
bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly);
|
|
|
|
bl += sprintf(b + bl, " ");
|
|
if (bd) {
|
|
bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
|
|
MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
|
|
"" : (bd->bd_holder == ib_dev) ?
|
|
"CLAIMED: IBLOCK" : "CLAIMED: OS");
|
|
} else {
|
|
bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
|
|
}
|
|
|
|
return bl;
|
|
}
|
|
|
|
static int
|
|
iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct blk_integrity *bi;
|
|
struct bio_integrity_payload *bip;
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct scatterlist *sg;
|
|
int i, rc;
|
|
|
|
bi = bdev_get_integrity(ib_dev->ibd_bd);
|
|
if (!bi) {
|
|
pr_err("Unable to locate bio_integrity\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
|
|
if (!bip) {
|
|
pr_err("Unable to allocate bio_integrity_payload\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
|
|
dev->prot_length;
|
|
bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
|
|
|
|
pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
|
|
(unsigned long long)bip->bip_iter.bi_sector);
|
|
|
|
for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
|
|
|
|
rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
|
|
sg->offset);
|
|
if (rc != sg->length) {
|
|
pr_err("bio_integrity_add_page() failed; %d\n", rc);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
|
|
sg_page(sg), sg->length, sg->offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static sense_reason_t
|
|
iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct iblock_req *ibr;
|
|
struct bio *bio, *bio_start;
|
|
struct bio_list list;
|
|
struct scatterlist *sg;
|
|
u32 sg_num = sgl_nents;
|
|
sector_t block_lba;
|
|
unsigned bio_cnt;
|
|
int rw = 0;
|
|
int i;
|
|
|
|
if (data_direction == DMA_TO_DEVICE) {
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
|
|
/*
|
|
* Force writethrough using WRITE_FUA if a volatile write cache
|
|
* is not enabled, or if initiator set the Force Unit Access bit.
|
|
*/
|
|
if (q->flush_flags & REQ_FUA) {
|
|
if (cmd->se_cmd_flags & SCF_FUA)
|
|
rw = WRITE_FUA;
|
|
else if (!(q->flush_flags & REQ_FLUSH))
|
|
rw = WRITE_FUA;
|
|
else
|
|
rw = WRITE;
|
|
} else {
|
|
rw = WRITE;
|
|
}
|
|
} else {
|
|
rw = READ;
|
|
}
|
|
|
|
/*
|
|
* Convert the blocksize advertised to the initiator to the 512 byte
|
|
* units unconditionally used by the Linux block layer.
|
|
*/
|
|
if (dev->dev_attrib.block_size == 4096)
|
|
block_lba = (cmd->t_task_lba << 3);
|
|
else if (dev->dev_attrib.block_size == 2048)
|
|
block_lba = (cmd->t_task_lba << 2);
|
|
else if (dev->dev_attrib.block_size == 1024)
|
|
block_lba = (cmd->t_task_lba << 1);
|
|
else if (dev->dev_attrib.block_size == 512)
|
|
block_lba = cmd->t_task_lba;
|
|
else {
|
|
pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
|
|
" %u\n", dev->dev_attrib.block_size);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
|
|
if (!ibr)
|
|
goto fail;
|
|
cmd->priv = ibr;
|
|
|
|
if (!sgl_nents) {
|
|
atomic_set(&ibr->pending, 1);
|
|
iblock_complete_cmd(cmd);
|
|
return 0;
|
|
}
|
|
|
|
bio = iblock_get_bio(cmd, block_lba, sgl_nents);
|
|
if (!bio)
|
|
goto fail_free_ibr;
|
|
|
|
bio_start = bio;
|
|
bio_list_init(&list);
|
|
bio_list_add(&list, bio);
|
|
|
|
atomic_set(&ibr->pending, 2);
|
|
bio_cnt = 1;
|
|
|
|
for_each_sg(sgl, sg, sgl_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(cmd, block_lba, sg_num);
|
|
if (!bio)
|
|
goto fail_put_bios;
|
|
|
|
atomic_inc(&ibr->pending);
|
|
bio_list_add(&list, bio);
|
|
bio_cnt++;
|
|
}
|
|
|
|
/* Always in 512 byte units for Linux/Block */
|
|
block_lba += sg->length >> IBLOCK_LBA_SHIFT;
|
|
sg_num--;
|
|
}
|
|
|
|
if (cmd->prot_type) {
|
|
int rc = iblock_alloc_bip(cmd, bio_start);
|
|
if (rc)
|
|
goto fail_put_bios;
|
|
}
|
|
|
|
iblock_submit_bios(&list, rw);
|
|
iblock_complete_cmd(cmd);
|
|
return 0;
|
|
|
|
fail_put_bios:
|
|
while ((bio = bio_list_pop(&list)))
|
|
bio_put(bio);
|
|
fail_free_ibr:
|
|
kfree(ibr);
|
|
fail:
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
static sector_t iblock_get_blocks(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
struct request_queue *q = bdev_get_queue(bd);
|
|
|
|
return iblock_emulate_read_cap_with_block_size(dev, bd, q);
|
|
}
|
|
|
|
static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
int ret;
|
|
|
|
ret = bdev_alignment_offset(bd);
|
|
if (ret == -1)
|
|
return 0;
|
|
|
|
/* convert offset-bytes to offset-lbas */
|
|
return ret / bdev_logical_block_size(bd);
|
|
}
|
|
|
|
static unsigned int iblock_get_lbppbe(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
|
|
|
|
return ilog2(logs_per_phys);
|
|
}
|
|
|
|
static unsigned int iblock_get_io_min(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
|
|
return bdev_io_min(bd);
|
|
}
|
|
|
|
static unsigned int iblock_get_io_opt(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
|
|
return bdev_io_opt(bd);
|
|
}
|
|
|
|
static struct sbc_ops iblock_sbc_ops = {
|
|
.execute_rw = iblock_execute_rw,
|
|
.execute_sync_cache = iblock_execute_sync_cache,
|
|
.execute_write_same = iblock_execute_write_same,
|
|
.execute_write_same_unmap = iblock_execute_write_same_unmap,
|
|
.execute_unmap = iblock_execute_unmap,
|
|
};
|
|
|
|
static sense_reason_t
|
|
iblock_parse_cdb(struct se_cmd *cmd)
|
|
{
|
|
return sbc_parse_cdb(cmd, &iblock_sbc_ops);
|
|
}
|
|
|
|
static bool iblock_get_write_cache(struct se_device *dev)
|
|
{
|
|
struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
|
|
struct block_device *bd = ib_dev->ibd_bd;
|
|
struct request_queue *q = bdev_get_queue(bd);
|
|
|
|
return q->flush_flags & REQ_FLUSH;
|
|
}
|
|
|
|
static struct se_subsystem_api iblock_template = {
|
|
.name = "iblock",
|
|
.inquiry_prod = "IBLOCK",
|
|
.inquiry_rev = IBLOCK_VERSION,
|
|
.owner = THIS_MODULE,
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
|
|
.attach_hba = iblock_attach_hba,
|
|
.detach_hba = iblock_detach_hba,
|
|
.alloc_device = iblock_alloc_device,
|
|
.configure_device = iblock_configure_device,
|
|
.free_device = iblock_free_device,
|
|
.parse_cdb = iblock_parse_cdb,
|
|
.set_configfs_dev_params = iblock_set_configfs_dev_params,
|
|
.show_configfs_dev_params = iblock_show_configfs_dev_params,
|
|
.get_device_type = sbc_get_device_type,
|
|
.get_blocks = iblock_get_blocks,
|
|
.get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
|
|
.get_lbppbe = iblock_get_lbppbe,
|
|
.get_io_min = iblock_get_io_min,
|
|
.get_io_opt = iblock_get_io_opt,
|
|
.get_write_cache = iblock_get_write_cache,
|
|
};
|
|
|
|
static int __init iblock_module_init(void)
|
|
{
|
|
return transport_subsystem_register(&iblock_template);
|
|
}
|
|
|
|
static void __exit 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);
|