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![Lucas De Marchi](/assets/img/avatar_default.png)
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
703 lines
17 KiB
C
703 lines
17 KiB
C
/*******************************************************************************
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* Filename: target_core_file.c
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*
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* This file contains the Storage Engine <-> FILEIO transport specific functions
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*
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* Copyright (c) 2005 PyX Technologies, Inc.
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* Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
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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/blkdev.h>
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#include <linux/slab.h>
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#include <linux/spinlock.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_file.h"
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#if 1
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#define DEBUG_FD_CACHE(x...) printk(x)
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#else
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#define DEBUG_FD_CACHE(x...)
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#endif
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#if 1
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#define DEBUG_FD_FUA(x...) printk(x)
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#else
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#define DEBUG_FD_FUA(x...)
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#endif
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static struct se_subsystem_api fileio_template;
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/* fd_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 fd_attach_hba(struct se_hba *hba, u32 host_id)
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{
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struct fd_host *fd_host;
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fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
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if (!(fd_host)) {
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printk(KERN_ERR "Unable to allocate memory for struct fd_host\n");
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return -1;
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}
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fd_host->fd_host_id = host_id;
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atomic_set(&hba->left_queue_depth, FD_HBA_QUEUE_DEPTH);
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atomic_set(&hba->max_queue_depth, FD_HBA_QUEUE_DEPTH);
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hba->hba_ptr = (void *) fd_host;
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printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
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" Target Core Stack %s\n", hba->hba_id, FD_VERSION,
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TARGET_CORE_MOD_VERSION);
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printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
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" Target Core with TCQ Depth: %d MaxSectors: %u\n",
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hba->hba_id, fd_host->fd_host_id,
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atomic_read(&hba->max_queue_depth), FD_MAX_SECTORS);
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return 0;
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}
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static void fd_detach_hba(struct se_hba *hba)
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{
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struct fd_host *fd_host = hba->hba_ptr;
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printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
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" Target Core\n", hba->hba_id, fd_host->fd_host_id);
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kfree(fd_host);
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hba->hba_ptr = NULL;
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}
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static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
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{
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struct fd_dev *fd_dev;
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struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
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fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
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if (!(fd_dev)) {
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printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n");
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return NULL;
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}
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fd_dev->fd_host = fd_host;
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printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name);
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return fd_dev;
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}
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/* fd_create_virtdevice(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static struct se_device *fd_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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char *dev_p = NULL;
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struct se_device *dev;
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struct se_dev_limits dev_limits;
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struct queue_limits *limits;
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struct fd_dev *fd_dev = (struct fd_dev *) p;
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struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
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mm_segment_t old_fs;
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struct file *file;
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struct inode *inode = NULL;
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int dev_flags = 0, flags, ret = -EINVAL;
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memset(&dev_limits, 0, sizeof(struct se_dev_limits));
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old_fs = get_fs();
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set_fs(get_ds());
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dev_p = getname(fd_dev->fd_dev_name);
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set_fs(old_fs);
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if (IS_ERR(dev_p)) {
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printk(KERN_ERR "getname(%s) failed: %lu\n",
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fd_dev->fd_dev_name, IS_ERR(dev_p));
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ret = PTR_ERR(dev_p);
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goto fail;
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}
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#if 0
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if (di->no_create_file)
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flags = O_RDWR | O_LARGEFILE;
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else
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flags = O_RDWR | O_CREAT | O_LARGEFILE;
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#else
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flags = O_RDWR | O_CREAT | O_LARGEFILE;
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#endif
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/* flags |= O_DIRECT; */
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/*
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* If fd_buffered_io=1 has not been set explicitly (the default),
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* use O_SYNC to force FILEIO writes to disk.
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*/
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if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO))
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flags |= O_SYNC;
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file = filp_open(dev_p, flags, 0600);
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if (IS_ERR(file)) {
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printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
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ret = PTR_ERR(file);
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goto fail;
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}
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if (!file || !file->f_dentry) {
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printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
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goto fail;
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}
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fd_dev->fd_file = file;
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/*
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* If using a block backend with this struct file, we extract
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* fd_dev->fd_[block,dev]_size from struct block_device.
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*
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* Otherwise, we use the passed fd_size= from configfs
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*/
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inode = file->f_mapping->host;
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if (S_ISBLK(inode->i_mode)) {
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struct request_queue *q;
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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(inode->i_bdev);
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limits = &dev_limits.limits;
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limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
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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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/*
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* Determine the number of bytes from i_size_read() minus
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* one (1) logical sector from underlying struct block_device
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*/
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fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
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fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) -
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fd_dev->fd_block_size);
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printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct"
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" block_device blocks: %llu logical_block_size: %d\n",
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fd_dev->fd_dev_size,
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div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size),
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fd_dev->fd_block_size);
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} else {
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if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
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printk(KERN_ERR "FILEIO: Missing fd_dev_size="
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" parameter, and no backing struct"
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" block_device\n");
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goto fail;
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}
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limits = &dev_limits.limits;
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limits->logical_block_size = FD_BLOCKSIZE;
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limits->max_hw_sectors = FD_MAX_SECTORS;
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limits->max_sectors = FD_MAX_SECTORS;
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fd_dev->fd_block_size = FD_BLOCKSIZE;
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}
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dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
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dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
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dev = transport_add_device_to_core_hba(hba, &fileio_template,
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se_dev, dev_flags, (void *)fd_dev,
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&dev_limits, "FILEIO", FD_VERSION);
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if (!(dev))
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goto fail;
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fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
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fd_dev->fd_queue_depth = dev->queue_depth;
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printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
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" %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
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fd_dev->fd_dev_name, fd_dev->fd_dev_size);
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putname(dev_p);
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return dev;
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fail:
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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putname(dev_p);
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return ERR_PTR(ret);
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}
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/* fd_free_device(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static void fd_free_device(void *p)
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{
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struct fd_dev *fd_dev = (struct fd_dev *) p;
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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kfree(fd_dev);
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}
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static inline struct fd_request *FILE_REQ(struct se_task *task)
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{
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return container_of(task, struct fd_request, fd_task);
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}
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static struct se_task *
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fd_alloc_task(struct se_cmd *cmd)
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{
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struct fd_request *fd_req;
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fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL);
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if (!(fd_req)) {
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printk(KERN_ERR "Unable to allocate struct fd_request\n");
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return NULL;
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}
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fd_req->fd_dev = SE_DEV(cmd)->dev_ptr;
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return &fd_req->fd_task;
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}
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static int fd_do_readv(struct se_task *task)
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{
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struct fd_request *req = FILE_REQ(task);
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struct file *fd = req->fd_dev->fd_file;
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struct scatterlist *sg = task->task_sg;
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struct iovec *iov;
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mm_segment_t old_fs;
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loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size);
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int ret = 0, i;
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iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL);
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if (!(iov)) {
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printk(KERN_ERR "Unable to allocate fd_do_readv iov[]\n");
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return -1;
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}
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for (i = 0; i < task->task_sg_num; i++) {
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iov[i].iov_len = sg[i].length;
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iov[i].iov_base = sg_virt(&sg[i]);
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}
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old_fs = get_fs();
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set_fs(get_ds());
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ret = vfs_readv(fd, &iov[0], task->task_sg_num, &pos);
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set_fs(old_fs);
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kfree(iov);
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/*
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* Return zeros and GOOD status even if the READ did not return
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* the expected virt_size for struct file w/o a backing struct
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* block_device.
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*/
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if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
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if (ret < 0 || ret != task->task_size) {
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printk(KERN_ERR "vfs_readv() returned %d,"
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" expecting %d for S_ISBLK\n", ret,
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(int)task->task_size);
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return -1;
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}
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} else {
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if (ret < 0) {
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printk(KERN_ERR "vfs_readv() returned %d for non"
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" S_ISBLK\n", ret);
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return -1;
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}
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}
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return 1;
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}
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static int fd_do_writev(struct se_task *task)
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{
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struct fd_request *req = FILE_REQ(task);
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struct file *fd = req->fd_dev->fd_file;
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struct scatterlist *sg = task->task_sg;
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struct iovec *iov;
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mm_segment_t old_fs;
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loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size);
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int ret, i = 0;
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iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL);
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if (!(iov)) {
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printk(KERN_ERR "Unable to allocate fd_do_writev iov[]\n");
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return -1;
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}
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for (i = 0; i < task->task_sg_num; i++) {
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iov[i].iov_len = sg[i].length;
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iov[i].iov_base = sg_virt(&sg[i]);
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}
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old_fs = get_fs();
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set_fs(get_ds());
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ret = vfs_writev(fd, &iov[0], task->task_sg_num, &pos);
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set_fs(old_fs);
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kfree(iov);
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if (ret < 0 || ret != task->task_size) {
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printk(KERN_ERR "vfs_writev() returned %d\n", ret);
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return -1;
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}
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return 1;
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}
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static void fd_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 se_device *dev = cmd->se_dev;
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struct fd_dev *fd_dev = dev->dev_ptr;
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int immed = (cmd->t_task->t_task_cdb[1] & 0x2);
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loff_t start, end;
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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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* Determine if we will be flushing the entire device.
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*/
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if (cmd->t_task->t_task_lba == 0 && cmd->data_length == 0) {
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start = 0;
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end = LLONG_MAX;
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} else {
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start = cmd->t_task->t_task_lba * DEV_ATTRIB(dev)->block_size;
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if (cmd->data_length)
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end = start + cmd->data_length;
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else
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end = LLONG_MAX;
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}
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ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
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if (ret != 0)
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printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret);
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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 fd_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 fd_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 fd_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 fd_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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/*
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* WRITE Force Unit Access (FUA) emulation on a per struct se_task
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* LBA range basis..
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*/
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static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task)
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{
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struct se_device *dev = cmd->se_dev;
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struct fd_dev *fd_dev = dev->dev_ptr;
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loff_t start = task->task_lba * DEV_ATTRIB(dev)->block_size;
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loff_t end = start + task->task_size;
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int ret;
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DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
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task->task_lba, task->task_size);
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ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
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if (ret != 0)
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printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret);
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}
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static int fd_do_task(struct se_task *task)
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{
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struct se_cmd *cmd = task->task_se_cmd;
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struct se_device *dev = cmd->se_dev;
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int ret = 0;
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/*
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* Call vectorized fileio functions to map struct scatterlist
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* physical memory addresses to struct iovec virtual memory.
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*/
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if (task->task_data_direction == DMA_FROM_DEVICE) {
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ret = fd_do_readv(task);
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} else {
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ret = fd_do_writev(task);
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if (ret > 0 &&
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DEV_ATTRIB(dev)->emulate_write_cache > 0 &&
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DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
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T_TASK(cmd)->t_tasks_fua) {
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/*
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* We might need to be a bit smarter here
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* and return some sense data to let the initiator
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* know the FUA WRITE cache sync failed..?
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*/
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|
fd_emulate_write_fua(cmd, task);
|
|
}
|
|
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret) {
|
|
task->task_scsi_status = GOOD;
|
|
transport_complete_task(task, 1);
|
|
}
|
|
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
|
|
}
|
|
|
|
/* fd_free_task(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static void fd_free_task(struct se_task *task)
|
|
{
|
|
struct fd_request *req = FILE_REQ(task);
|
|
|
|
kfree(req);
|
|
}
|
|
|
|
enum {
|
|
Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_fd_dev_name, "fd_dev_name=%s"},
|
|
{Opt_fd_dev_size, "fd_dev_size=%s"},
|
|
{Opt_fd_buffered_io, "fd_buffered_io=%d"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static ssize_t fd_set_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
const char *page, ssize_t count)
|
|
{
|
|
struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
|
|
char *orig, *ptr, *arg_p, *opts;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int ret = 0, arg, token;
|
|
|
|
opts = kstrdup(page, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
|
|
orig = opts;
|
|
|
|
while ((ptr = strsep(&opts, ",")) != NULL) {
|
|
if (!*ptr)
|
|
continue;
|
|
|
|
token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_fd_dev_name:
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
|
|
"%s", arg_p);
|
|
kfree(arg_p);
|
|
printk(KERN_INFO "FILEIO: Referencing Path: %s\n",
|
|
fd_dev->fd_dev_name);
|
|
fd_dev->fbd_flags |= FBDF_HAS_PATH;
|
|
break;
|
|
case Opt_fd_dev_size:
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
|
|
kfree(arg_p);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "strict_strtoull() failed for"
|
|
" fd_dev_size=\n");
|
|
goto out;
|
|
}
|
|
printk(KERN_INFO "FILEIO: Referencing Size: %llu"
|
|
" bytes\n", fd_dev->fd_dev_size);
|
|
fd_dev->fbd_flags |= FBDF_HAS_SIZE;
|
|
break;
|
|
case Opt_fd_buffered_io:
|
|
match_int(args, &arg);
|
|
if (arg != 1) {
|
|
printk(KERN_ERR "bogus fd_buffered_io=%d value\n", arg);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
printk(KERN_INFO "FILEIO: Using buffered I/O"
|
|
" operations for struct fd_dev\n");
|
|
|
|
fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
|
|
{
|
|
struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr;
|
|
|
|
if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
|
|
printk(KERN_ERR "Missing fd_dev_name=\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t fd_show_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
char *b)
|
|
{
|
|
struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
|
|
ssize_t bl = 0;
|
|
|
|
bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
|
|
bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
|
|
fd_dev->fd_dev_name, fd_dev->fd_dev_size,
|
|
(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ?
|
|
"Buffered" : "Synchronous");
|
|
return bl;
|
|
}
|
|
|
|
/* fd_get_cdb(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static unsigned char *fd_get_cdb(struct se_task *task)
|
|
{
|
|
struct fd_request *req = FILE_REQ(task);
|
|
|
|
return req->fd_scsi_cdb;
|
|
}
|
|
|
|
/* fd_get_device_rev(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static u32 fd_get_device_rev(struct se_device *dev)
|
|
{
|
|
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
|
|
}
|
|
|
|
/* fd_get_device_type(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static u32 fd_get_device_type(struct se_device *dev)
|
|
{
|
|
return TYPE_DISK;
|
|
}
|
|
|
|
static sector_t fd_get_blocks(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = dev->dev_ptr;
|
|
unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
|
|
DEV_ATTRIB(dev)->block_size);
|
|
|
|
return blocks_long;
|
|
}
|
|
|
|
static struct se_subsystem_api fileio_template = {
|
|
.name = "fileio",
|
|
.owner = THIS_MODULE,
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
|
|
.attach_hba = fd_attach_hba,
|
|
.detach_hba = fd_detach_hba,
|
|
.allocate_virtdevice = fd_allocate_virtdevice,
|
|
.create_virtdevice = fd_create_virtdevice,
|
|
.free_device = fd_free_device,
|
|
.dpo_emulated = fd_emulated_dpo,
|
|
.fua_write_emulated = fd_emulated_fua_write,
|
|
.fua_read_emulated = fd_emulated_fua_read,
|
|
.write_cache_emulated = fd_emulated_write_cache,
|
|
.alloc_task = fd_alloc_task,
|
|
.do_task = fd_do_task,
|
|
.do_sync_cache = fd_emulate_sync_cache,
|
|
.free_task = fd_free_task,
|
|
.check_configfs_dev_params = fd_check_configfs_dev_params,
|
|
.set_configfs_dev_params = fd_set_configfs_dev_params,
|
|
.show_configfs_dev_params = fd_show_configfs_dev_params,
|
|
.get_cdb = fd_get_cdb,
|
|
.get_device_rev = fd_get_device_rev,
|
|
.get_device_type = fd_get_device_type,
|
|
.get_blocks = fd_get_blocks,
|
|
};
|
|
|
|
static int __init fileio_module_init(void)
|
|
{
|
|
return transport_subsystem_register(&fileio_template);
|
|
}
|
|
|
|
static void fileio_module_exit(void)
|
|
{
|
|
transport_subsystem_release(&fileio_template);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
|
|
MODULE_AUTHOR("nab@Linux-iSCSI.org");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(fileio_module_init);
|
|
module_exit(fileio_module_exit);
|