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Message-Id: <1283160144-6848-1-git-send-email-nab@linux-iscsi.org>
Date: Mon, 30 Aug 2010 02:22:24 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Jens Axboe <axboe@...nel.dk>,
Boaz Harrosh <bharrosh@...asas.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [RFC 15/22] tcm: Add FILEIO subsystem plugin
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch adds the O_SYNC FILEIO subsystem plugin for accessing struct file
using Linux/VFS struct file_operations. It also includes WriteCache and FUA
Write Emulation support to struct file using fs/sync.c/vfs_fsync_range()
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/target/target_core_file.c | 1185 +++++++++++++++++++++++++++++++++++++
drivers/target/target_core_file.h | 81 +++
2 files changed, 1266 insertions(+), 0 deletions(-)
create mode 100644 drivers/target/target_core_file.c
create mode 100644 drivers/target/target_core_file.h
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
new file mode 100644
index 0000000..8a42967
--- /dev/null
+++ b/drivers/target/target_core_file.c
@@ -0,0 +1,1185 @@
+/*******************************************************************************
+ * Filename: target_core_file.c
+ *
+ * This file contains the Storage Engine <-> FILEIO transport specific functions
+ *
+ * Copyright (c) 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_file.h"
+
+#if 1
+#define DEBUG_FD_CACHE(x...) printk(x)
+#else
+#define DEBUG_FD_CACHE(x...)
+#endif
+
+#if 1
+#define DEBUG_FD_FUA(x...) printk(x)
+#else
+#define DEBUG_FD_FUA(x...)
+#endif
+
+static struct se_subsystem_api fileio_template;
+
+static void __fd_get_dev_info(struct fd_dev *, char *, int *);
+
+/* fd_attach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_attach_hba(struct se_hba *hba, u32 host_id)
+{
+ struct fd_host *fd_host;
+
+ fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
+ if (!(fd_host)) {
+ printk(KERN_ERR "Unable to allocate memory for struct fd_host\n");
+ return -1;
+ }
+
+ fd_host->fd_host_id = host_id;
+
+ atomic_set(&hba->left_queue_depth, FD_HBA_QUEUE_DEPTH);
+ atomic_set(&hba->max_queue_depth, FD_HBA_QUEUE_DEPTH);
+ hba->hba_ptr = (void *) fd_host;
+
+ printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
+ " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
+ TARGET_CORE_MOD_VERSION);
+ printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
+ " Target Core with TCQ Depth: %d MaxSectors: %u\n",
+ hba->hba_id, fd_host->fd_host_id,
+ atomic_read(&hba->max_queue_depth), FD_MAX_SECTORS);
+
+ return 0;
+}
+
+/* fd_detach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_detach_hba(struct se_hba *hba)
+{
+ struct fd_host *fd_host;
+
+ if (!hba->hba_ptr) {
+ printk(KERN_ERR "hba->hba_ptr is NULL!\n");
+ return -1;
+ }
+ fd_host = (struct fd_host *) hba->hba_ptr;
+
+ printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
+ " Target Core\n", hba->hba_id, fd_host->fd_host_id);
+
+ kfree(fd_host);
+ hba->hba_ptr = NULL;
+
+ return 0;
+}
+
+static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+ struct fd_dev *fd_dev;
+ struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
+
+ fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
+ if (!(fd_dev)) {
+ printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n");
+ return NULL;
+ }
+
+ fd_dev->fd_host = fd_host;
+
+ printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name);
+
+ return fd_dev;
+}
+
+/* fd_create_virtdevice(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static struct se_device *fd_create_virtdevice(
+ struct se_hba *hba,
+ struct se_subsystem_dev *se_dev,
+ void *p)
+{
+ char *dev_p = NULL;
+ struct se_device *dev;
+ struct fd_dev *fd_dev = (struct fd_dev *) p;
+ struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
+ mm_segment_t old_fs;
+ struct file *file;
+ struct inode *inode = NULL;
+ int dev_flags = 0, flags;
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ dev_p = getname(fd_dev->fd_dev_name);
+ set_fs(old_fs);
+
+ if (IS_ERR(dev_p)) {
+ printk(KERN_ERR "getname(%s) failed: %lu\n",
+ fd_dev->fd_dev_name, IS_ERR(dev_p));
+ goto fail;
+ }
+#if 0
+ if (di->no_create_file)
+ flags = O_RDWR | O_LARGEFILE;
+ else
+ flags = O_RDWR | O_CREAT | O_LARGEFILE;
+#else
+ flags = O_RDWR | O_CREAT | O_LARGEFILE;
+#endif
+/* flags |= O_DIRECT; */
+ /*
+ * If fd_buffered_io=1 has not been set explictly (the default),
+ * use O_SYNC to force FILEIO writes to disk.
+ */
+ if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO))
+ flags |= O_SYNC;
+
+ file = filp_open(dev_p, flags, 0600);
+
+ if (IS_ERR(file) || !file || !file->f_dentry) {
+ printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
+ goto fail;
+ }
+ fd_dev->fd_file = file;
+ /*
+ * If we are claiming a blockend for this struct file, we extract
+ * fd_dev->fd_size from struct block_device.
+ *
+ * Otherwise, we use the passed fd_size= from configfs
+ */
+ inode = igrab(file->f_mapping->host);
+ if (!(inode)) {
+ printk(KERN_ERR "FILEIO: Unable to locate struct inode from"
+ " struct file\n");
+ goto fail;
+ }
+ /*
+ * If struct file is referencing a underlying struct block_device,
+ * claim it now.
+ */
+ if (S_ISBLK(inode->i_mode)) {
+ /*
+ * Determine the number of bytes from i_size_read() minus
+ * one (1) logical sector from underlying struct block_device
+ */
+ fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
+ fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) -
+ fd_dev->fd_block_size);
+
+ printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct"
+ " block_device blocks: %llu logical_block_size: %d\n",
+ fd_dev->fd_dev_size,
+ div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size),
+ fd_dev->fd_block_size);
+ } else {
+ if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
+ printk(KERN_ERR "FILEIO: Missing fd_dev_size="
+ " parameter, and no backing struct"
+ " block_device\n");
+ goto fail;
+ }
+ fd_dev->fd_block_size = FD_BLOCKSIZE;
+ }
+ /*
+ * Pass dev_flags for linux_blockdevice_claim_bd or
+ * linux_blockdevice_claim() from the usage above.
+ *
+ * Note that transport_add_device_to_core_hba() will call
+ * linux_blockdevice_release() internally on failure to
+ * call bd_release() on the referenced struct block_device.
+ */
+ dev = transport_add_device_to_core_hba(hba, &fileio_template,
+ se_dev, dev_flags, (void *)fd_dev);
+ if (!(dev))
+ goto fail;
+
+ fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
+ fd_dev->fd_queue_depth = dev->queue_depth;
+
+ printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
+ " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
+ fd_dev->fd_dev_name, fd_dev->fd_dev_size);
+
+ iput(inode);
+ putname(dev_p);
+ return dev;
+fail:
+ if (fd_dev->fd_file) {
+ filp_close(fd_dev->fd_file, NULL);
+ fd_dev->fd_file = NULL;
+ }
+ if (inode)
+ iput(inode);
+ putname(dev_p);
+ return NULL;
+}
+
+/* fd_activate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_activate_device(struct se_device *dev)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) dev->dev_ptr;
+ struct fd_host *fd_host = fd_dev->fd_host;
+
+ printk(KERN_INFO "CORE_FILE[%u] - Activating Device with TCQ: %d at"
+ " FILEIO Device ID: %d\n", fd_host->fd_host_id,
+ fd_dev->fd_queue_depth, fd_dev->fd_dev_id);
+
+ return 0;
+}
+
+/* fd_deactivate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void fd_deactivate_device(struct se_device *dev)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) dev->dev_ptr;
+ struct fd_host *fd_host = fd_dev->fd_host;
+
+ printk(KERN_INFO "CORE_FILE[%u] - Deactivating Device with TCQ: %d at"
+ " FILEIO Device ID: %d\n", fd_host->fd_host_id,
+ fd_dev->fd_queue_depth, fd_dev->fd_dev_id);
+
+ return;
+}
+
+/* fd_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void fd_free_device(void *p)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) p;
+
+ if (fd_dev->fd_file) {
+ filp_close(fd_dev->fd_file, NULL);
+ fd_dev->fd_file = NULL;
+ }
+
+ kfree(fd_dev);
+}
+
+/* fd_transport_complete(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_transport_complete(struct se_task *task)
+{
+ return 0;
+}
+
+/* fd_allocate_request(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void *fd_allocate_request(
+ struct se_task *task,
+ struct se_device *dev)
+{
+ struct fd_request *fd_req;
+
+ fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL);
+ if (!(fd_req)) {
+ printk(KERN_ERR "Unable to allocate struct fd_request\n");
+ return NULL;
+ }
+
+ fd_req->fd_dev = (struct fd_dev *) dev->dev_ptr;
+
+ return (void *)fd_req;
+}
+
+/* fd_emulate_inquiry():
+ *
+ *
+ */
+static int fd_emulate_inquiry(struct se_task *task)
+{
+ unsigned char prod[64], se_location[128];
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct fd_dev *fdev = (struct fd_dev *) task->se_dev->dev_ptr;
+ struct se_hba *hba = task->se_dev->se_hba;
+
+ memset(prod, 0, 64);
+ memset(se_location, 0, 128);
+
+ sprintf(prod, "FILEIO");
+ sprintf(se_location, "%u_%u", hba->hba_id, fdev->fd_dev_id);
+
+ return transport_generic_emulate_inquiry(cmd, TYPE_DISK, prod,
+ FD_VERSION, se_location);
+}
+
+/* fd_emulate_read_cap():
+ *
+ *
+ */
+static int fd_emulate_read_cap(struct se_task *task)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) task->se_dev->dev_ptr;
+ unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
+ DEV_ATTRIB(task->se_dev)->block_size);
+ u32 blocks;
+
+ if (blocks_long >= 0x00000000ffffffff)
+ blocks = 0xffffffff;
+ else
+ blocks = (u32)blocks_long;
+
+ return transport_generic_emulate_readcapacity(TASK_CMD(task), blocks);
+}
+
+static int fd_emulate_read_cap16(struct se_task *task)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) task->se_dev->dev_ptr;
+ unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
+ DEV_ATTRIB(task->se_dev)->block_size);
+
+ return transport_generic_emulate_readcapacity_16(TASK_CMD(task),
+ blocks_long);
+}
+
+/* fd_emulate_scsi_cdb():
+ *
+ *
+ */
+static int fd_emulate_scsi_cdb(struct se_task *task)
+{
+ int ret;
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct fd_request *fd_req = (struct fd_request *) task->transport_req;
+
+ switch (fd_req->fd_scsi_cdb[0]) {
+ case INQUIRY:
+ if (fd_emulate_inquiry(task) < 0)
+ return PYX_TRANSPORT_INVALID_CDB_FIELD;
+ break;
+ case READ_CAPACITY:
+ ret = fd_emulate_read_cap(task);
+ if (ret < 0)
+ return ret;
+ break;
+ case MODE_SENSE:
+ ret = transport_generic_emulate_modesense(TASK_CMD(task),
+ fd_req->fd_scsi_cdb, fd_req->fd_buf, 0,
+ TYPE_DISK);
+ if (ret < 0)
+ return ret;
+ break;
+ case MODE_SENSE_10:
+ ret = transport_generic_emulate_modesense(TASK_CMD(task),
+ fd_req->fd_scsi_cdb, fd_req->fd_buf, 1,
+ TYPE_DISK);
+ if (ret < 0)
+ return ret;
+ break;
+ case SERVICE_ACTION_IN:
+ if ((T_TASK(cmd)->t_task_cdb[1] & 0x1f) !=
+ SAI_READ_CAPACITY_16) {
+ printk(KERN_ERR "Unsupported SA: 0x%02x\n",
+ T_TASK(cmd)->t_task_cdb[1] & 0x1f);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+ ret = fd_emulate_read_cap16(task);
+ if (ret < 0)
+ return ret;
+ break;
+ case REQUEST_SENSE:
+ ret = transport_generic_emulate_request_sense(cmd,
+ T_TASK(cmd)->t_task_cdb);
+ if (ret < 0)
+ return ret;
+ break;
+ case ALLOW_MEDIUM_REMOVAL:
+ case ERASE:
+ case REZERO_UNIT:
+ case SEEK_10:
+ case SPACE:
+ case START_STOP:
+ case SYNCHRONIZE_CACHE:
+ case TEST_UNIT_READY:
+ case VERIFY:
+ case WRITE_FILEMARKS:
+ case RESERVE:
+ case RESERVE_10:
+ case RELEASE:
+ case RELEASE_10:
+ break;
+ default:
+ printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for FILEIO\n",
+ fd_req->fd_scsi_cdb[0]);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+static inline int fd_iovec_alloc(struct fd_request *req)
+{
+ req->fd_iovs = kzalloc(sizeof(struct iovec) * req->fd_sg_count,
+ GFP_KERNEL);
+ if (!(req->fd_iovs)) {
+ printk(KERN_ERR "Unable to allocate req->fd_iovs\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int fd_do_readv(struct fd_request *req, struct se_task *task)
+{
+ struct file *fd = req->fd_dev->fd_file;
+ struct scatterlist *sg = task->task_sg;
+ struct iovec iov[req->fd_sg_count];
+ mm_segment_t old_fs;
+ loff_t pos = (req->fd_lba * DEV_ATTRIB(task->se_dev)->block_size);
+ int ret = 0, i;
+
+ memset(iov, 0, sizeof(struct iovec) * req->fd_sg_count);
+
+ for (i = 0; i < req->fd_sg_count; i++) {
+ iov[i].iov_len = sg[i].length;
+ iov[i].iov_base = sg_virt(&sg[i]);
+ }
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ ret = vfs_readv(fd, &iov[0], req->fd_sg_count, &pos);
+ set_fs(old_fs);
+ /*
+ * Return zeros and GOOD status even if the READ did not return
+ * the expected virt_size for struct file w/o a backing struct
+ * block_device.
+ */
+ if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
+ if (ret < 0 || ret != req->fd_size) {
+ printk(KERN_ERR "vfs_readv() returned %d,"
+ " expecting %d for S_ISBLK\n", ret,
+ (int)req->fd_size);
+ return -1;
+ }
+ } else {
+ if (ret < 0) {
+ printk(KERN_ERR "vfs_readv() returned %d for non"
+ " S_ISBLK\n", ret);
+ return -1;
+ }
+ }
+
+ return 1;
+}
+
+#if 0
+
+static void fd_sendfile_free_DMA(struct se_cmd *cmd)
+{
+ printk(KERN_INFO "Release reference to pages now..\n");
+}
+
+static static int fd_sendactor(
+ read_descriptor_t *desc,
+ struct page *page,
+ unsigned long offset,
+ unsigned long size)
+{
+ unsigned long count = desc->count;
+ struct se_task *task = desc->arg.data;
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+ struct scatterlist *sg = task->task_sg;
+
+ printk(KERN_INFO "page: %p offset: %lu size: %lu\n", page,
+ offset, size);
+
+ __free_page(sg[req->fd_cur_offset].page);
+
+ printk(KERN_INFO "page_address(page): %p\n", page_address(page));
+ sg[req->fd_cur_offset].page = page;
+ sg[req->fd_cur_offset].offset = offset;
+ sg[req->fd_cur_offset].length = size;
+
+ printk(KERN_INFO "sg[%d:%p].page %p length: %d\n", req->fd_cur_offset,
+ &sg[req->fd_cur_offset], sg[req->fd_cur_offset].page,
+ sg[req->fd_cur_offset].length);
+
+ req->fd_cur_size += size;
+ printk(KERN_INFO "fd_cur_size: %u\n", req->fd_cur_size);
+
+ req->fd_cur_offset++;
+
+ desc->count--;
+ desc->written += size;
+ return size;
+}
+
+static int fd_do_sendfile(struct fd_request *req, struct se_task *task)
+{
+ int ret = 0;
+ struct file *fd = req->fd_dev->fd_file;
+
+ if (fd_seek(fd, req->fd_lba, DEV_ATTRIB(task->se_dev)->block_size) < 0)
+ return -1;
+
+ TASK_CMD(task)->transport_free_DMA = &fd_sendfile_free_DMA;
+
+ ret = fd->f_op->sendfile(fd, &fd->f_pos, req->fd_sg_count,
+ fd_sendactor, (void *)task);
+
+ if (ret < 0) {
+ printk(KERN_ERR "fd->f_op->sendfile() returned %d\n", ret);
+ return -1;
+ }
+
+ return 1;
+}
+#endif
+
+static int fd_do_writev(struct fd_request *req, struct se_task *task)
+{
+ struct file *fd = req->fd_dev->fd_file;
+ struct scatterlist *sg = task->task_sg;
+ struct iovec iov[req->fd_sg_count];
+ mm_segment_t old_fs;
+ loff_t pos = (req->fd_lba * DEV_ATTRIB(task->se_dev)->block_size);
+ int ret, i = 0;
+
+ memset(iov, 0, sizeof(struct iovec) * req->fd_sg_count);
+
+ for (i = 0; i < req->fd_sg_count; i++) {
+ iov[i].iov_len = sg[i].length;
+ iov[i].iov_base = sg_virt(&sg[i]);
+ }
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ ret = vfs_writev(fd, &iov[0], req->fd_sg_count, &pos);
+ set_fs(old_fs);
+
+ if (ret < 0 || ret != req->fd_size) {
+ printk(KERN_ERR "vfs_writev() returned %d\n", ret);
+ return -1;
+ }
+
+ return 1;
+}
+
+/*
+ * Called from transport_generic_synchronize_cache() to flush the entire
+ * struct file (and possibly backing struct block_device) using vfs_fsync().
+ */
+static int fd_do_sync_cache(struct se_cmd *cmd, int immed)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *)cmd->se_dev->dev_ptr;
+ struct file *fd = fd_dev->fd_file;
+ int ret;
+
+ ret = vfs_fsync(fd, 0);
+ if (ret != 0) {
+ printk(KERN_ERR "FILEIO: vfs_fsync(fd, 0) returned: %d\n", ret);
+ return ret;
+ }
+ DEBUG_FD_CACHE("FILEIO: vfs_fsync(fd, 0) called, immed: %d\n", immed);
+ return ret;
+}
+
+/*
+ * Called from transport_generic_synchronize_cache() to flush LBA range
+ */
+int __fd_do_sync_cache_range(
+ struct se_cmd *cmd,
+ unsigned long long lba,
+ u32 size_in_bytes)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct fd_dev *fd_dev = (struct fd_dev *)dev->dev_ptr;
+ struct file *fd = fd_dev->fd_file;
+ loff_t start = (lba * DEV_ATTRIB(dev)->block_size);
+ loff_t bytes;
+ int ret, immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2);
+ /*
+ * If the Immediate bit is set, queue up the GOOD response
+ * for this SYNCHRONIZE_CACHE op
+ */
+ if (immed)
+ transport_complete_sync_cache(cmd, 1);
+ /*
+ * Determine if we will be flushing the entire device.
+ */
+ if ((T_TASK(cmd)->t_task_lba == 0) && (cmd->data_length == 0)) {
+ ret = fd_do_sync_cache(cmd, immed);
+ if (!(immed))
+ transport_complete_sync_cache(cmd, (ret == 0) ? 1 : 0);
+ return 0;
+ }
+ /*
+ * If a explict number of bytes fo flush has been provied by
+ * the initiator, use this value with vfs_sync_range(). Otherwise
+ * bytes = LLONG_MAX (matching fs/sync.c:vfs_fsync().
+ */
+ bytes = (size_in_bytes != 0) ? size_in_bytes : LLONG_MAX;
+ ret = vfs_fsync_range(fd, start, bytes, 0);
+ if (ret != 0) {
+ printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret);
+ if (!(immed))
+ transport_complete_sync_cache(cmd, 0);
+ return -1;
+ }
+ DEBUG_FD_CACHE("FILEIO: vfs_fsync_range(): LBA: %llu Starting offset:"
+ " %llu, bytes: %llu, immed: %d\n", lba, (unsigned long long)start,
+ (unsigned long long)bytes, immed);
+
+ if (!(immed))
+ transport_complete_sync_cache(cmd, 1);
+
+ return 0;
+}
+
+void fd_do_sync_cache_range(
+ struct se_cmd *cmd,
+ unsigned long long lba,
+ u32 size_in_bytes)
+{
+ __fd_do_sync_cache_range(cmd, lba, size_in_bytes);
+}
+
+/*
+ * Tell TCM Core that we are capable of WriteCache emulation for
+ * an underlying struct se_device.
+ */
+int fd_emulated_write_cache(struct se_device *dev)
+{
+ return 1;
+}
+
+int fd_emulated_dpo(struct se_device *dev)
+{
+ return 0;
+}
+/*
+ * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
+ * for TYPE_DISK.
+ */
+int fd_emulated_fua_write(struct se_device *dev)
+{
+ return 1;
+}
+
+int fd_emulated_fua_read(struct se_device *dev)
+{
+ return 0;
+}
+
+/*
+ * WRITE Force Unit Access (FUA) emulation on a per struct se_task
+ * LBA range basis..
+ */
+static inline int fd_emulate_write_fua(
+ struct se_cmd *cmd,
+ struct se_task *task)
+{
+ DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
+ task->task_lba, task->task_size);
+
+ return __fd_do_sync_cache_range(cmd, task->task_lba, task->task_size);
+}
+
+static int fd_do_task(struct se_task *task)
+{
+ struct se_cmd *cmd = task->task_se_cmd;
+ struct se_device *dev = cmd->se_dev;
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+ int ret = 0;
+
+ if (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))
+ return fd_emulate_scsi_cdb(task);
+
+ req->fd_lba = task->task_lba;
+ req->fd_size = task->task_size;
+ /*
+ * Call vectorized fileio functions to map struct scatterlist
+ * physical memory addresses to struct iovec virtual memory.
+ */
+ if (req->fd_data_direction == FD_DATA_READ)
+ ret = fd_do_readv(req, task);
+ else
+ ret = fd_do_writev(req, task);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret) {
+ /*
+ * Check for Forced Unit Access WRITE emulation
+ */
+ if ((DEV_ATTRIB(dev)->emulate_write_cache > 0) &&
+ (DEV_ATTRIB(dev)->emulate_fua_write > 0) &&
+ (req->fd_data_direction == FD_DATA_WRITE) &&
+ (T_TASK(cmd)->t_task_fua)) {
+ /*
+ * We might need to be a bit smarter here
+ * and return some sense data to let the initiator
+ * know the FUA WRITE cache sync failed..?
+ */
+ ret = fd_emulate_write_fua(cmd, task);
+ if (ret < 0) {
+ printk(KERN_ERR "FILEIO: fd_emulate"
+ "_write_fua() failed\n");
+ }
+ }
+
+ 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;
+
+ req = (struct fd_request *) task->transport_req;
+ kfree(req->fd_iovs);
+
+ kfree(req);
+}
+
+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 = (struct fd_dev *) se_dev->se_dev_su_ptr;
+ char *buf, *cur, *ptr, *ptr2;
+ int params = 0;
+
+ buf = kzalloc(count, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " temporary buffer\n");
+ return 0;
+ }
+ memcpy(buf, page, count);
+ cur = buf;
+
+ while (cur) {
+ ptr = strstr(cur, "=");
+ if (!(ptr))
+ goto out;
+
+ *ptr = '\0';
+ ptr++;
+
+ ptr2 = strstr(cur, "fd_dev_name");
+ if (ptr2) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ptr = strstrip(ptr);
+ snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
+ "%s", ptr);
+ printk(KERN_INFO "FILEIO: Referencing Path: %s\n",
+ fd_dev->fd_dev_name);
+ fd_dev->fbd_flags |= FBDF_HAS_PATH;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "fd_dev_size");
+ if (ptr2) {
+ transport_check_dev_params_delim(ptr, &cur);
+ if (strict_strtoull(ptr, 0, &fd_dev->fd_dev_size) < 0) {
+ printk(KERN_ERR "strict_strtoull() failed for"
+ " fd_dev_size=\n");
+ continue;
+ }
+ printk(KERN_INFO "FILEIO: Referencing Size: %llu"
+ " bytes\n", fd_dev->fd_dev_size);
+ fd_dev->fbd_flags |= FBDF_HAS_SIZE;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "fd_buffered_io");
+ if (ptr2) {
+ transport_check_dev_params_delim(ptr, &cur);
+ if (strncmp(ptr, "1", 1))
+ continue;
+
+ printk(KERN_INFO "FILEIO: Using buffered I/O"
+ " operations for struct fd_dev\n");
+
+ fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO;
+ params++;
+ continue;
+ } else
+ cur = NULL;
+ }
+
+out:
+ kfree(buf);
+ return (params) ? count : -EINVAL;
+}
+
+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 *page)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr;
+ int bl = 0;
+
+ __fd_get_dev_info(fd_dev, page, &bl);
+ return (ssize_t)bl;
+}
+
+static void fd_get_plugin_info(void *p, char *b, int *bl)
+{
+ *bl += sprintf(b + *bl, "TCM FILEIO Plugin %s\n", FD_VERSION);
+}
+
+static void fd_get_hba_info(struct se_hba *hba, char *b, int *bl)
+{
+ struct fd_host *fd_host = (struct fd_host *)hba->hba_ptr;
+
+ *bl += sprintf(b + *bl, "SE Host ID: %u FD Host ID: %u\n",
+ hba->hba_id, fd_host->fd_host_id);
+ *bl += sprintf(b + *bl, " TCM FILEIO HBA\n");
+}
+
+static void fd_get_dev_info(struct se_device *dev, char *b, int *bl)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) dev->dev_ptr;
+
+ __fd_get_dev_info(fd_dev, b, bl);
+}
+
+static void __fd_get_dev_info(struct fd_dev *fd_dev, char *b, int *bl)
+{
+ *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");
+}
+
+/* fd_map_task_non_SG():
+ *
+ *
+ */
+static void fd_map_task_non_SG(struct se_task *task)
+{
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_bufflen = task->task_size;
+ req->fd_buf = (void *) T_TASK(cmd)->t_task_buf;
+ req->fd_sg_count = 0;
+}
+
+/* fd_map_task_SG():
+ *
+ *
+ */
+static void fd_map_task_SG(struct se_task *task)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_bufflen = task->task_size;
+ req->fd_buf = NULL;
+ req->fd_sg_count = task->task_sg_num;
+}
+
+/* fd_CDB_none():
+ *
+ *
+ */
+static int fd_CDB_none(struct se_task *task, u32 size)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_data_direction = FD_DATA_NONE;
+ req->fd_bufflen = 0;
+ req->fd_sg_count = 0;
+ req->fd_buf = NULL;
+
+ return 0;
+}
+
+/* fd_CDB_read_non_SG():
+ *
+ *
+ */
+static int fd_CDB_read_non_SG(struct se_task *task, u32 size)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_data_direction = FD_DATA_READ;
+ fd_map_task_non_SG(task);
+
+ return 0;
+}
+
+/* fd_CDB_read_SG):
+ *
+ *
+ */
+static int fd_CDB_read_SG(struct se_task *task, u32 size)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_data_direction = FD_DATA_READ;
+ fd_map_task_SG(task);
+
+ return req->fd_sg_count;
+}
+
+/* fd_CDB_write_non_SG():
+ *
+ *
+ */
+static int fd_CDB_write_non_SG(struct se_task *task, u32 size)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_data_direction = FD_DATA_WRITE;
+ fd_map_task_non_SG(task);
+
+ return 0;
+}
+
+/* fd_CDB_write_SG():
+ *
+ *
+ */
+static int fd_CDB_write_SG(struct se_task *task, u32 size)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ req->fd_data_direction = FD_DATA_WRITE;
+ fd_map_task_SG(task);
+
+ return req->fd_sg_count;
+}
+
+/* fd_check_lba():
+ *
+ *
+ */
+static int fd_check_lba(unsigned long long lba, struct se_device *dev)
+{
+ return 0;
+}
+
+/* fd_check_for_SG(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_check_for_SG(struct se_task *task)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ return req->fd_sg_count;
+}
+
+/* fd_get_cdb(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static unsigned char *fd_get_cdb(struct se_task *task)
+{
+ struct fd_request *req = (struct fd_request *) task->transport_req;
+
+ return req->fd_scsi_cdb;
+}
+
+/* fd_get_blocksize(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_blocksize(struct se_device *dev)
+{
+ struct fd_dev *fd_dev = (struct fd_dev *) dev->dev_ptr;
+
+ return fd_dev->fd_block_size;
+}
+
+/* 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;
+}
+
+/* fd_get_dma_length(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_dma_length(u32 task_size, struct se_device *dev)
+{
+ return PAGE_SIZE;
+}
+
+/* fd_get_max_sectors(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_max_sectors(struct se_device *dev)
+{
+ return FD_MAX_SECTORS;
+}
+
+/* fd_get_queue_depth(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_queue_depth(struct se_device *dev)
+{
+ return FD_DEVICE_QUEUE_DEPTH;
+}
+
+static u32 fd_get_max_queue_depth(struct se_device *dev)
+{
+ return FD_MAX_DEVICE_QUEUE_DEPTH;
+}
+
+/*#warning FIXME v2.8: transport_type for FILEIO will need to change
+ with DIRECT_IO to blockdevs */
+
+static struct se_subsystem_api fileio_template = {
+ .name = "fileio",
+ .type = FILEIO,
+ .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
+ .external_submod = 1,
+ .attach_hba = fd_attach_hba,
+ .detach_hba = fd_detach_hba,
+ .cdb_none = fd_CDB_none,
+ .cdb_read_non_SG = fd_CDB_read_non_SG,
+ .cdb_read_SG = fd_CDB_read_SG,
+ .cdb_write_non_SG = fd_CDB_write_non_SG,
+ .cdb_write_SG = fd_CDB_write_SG,
+ .allocate_virtdevice = fd_allocate_virtdevice,
+ .create_virtdevice = fd_create_virtdevice,
+ .activate_device = fd_activate_device,
+ .deactivate_device = fd_deactivate_device,
+ .free_device = fd_free_device,
+ .do_sync_cache_range = fd_do_sync_cache_range,
+ .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,
+ .transport_complete = fd_transport_complete,
+ .allocate_request = fd_allocate_request,
+ .do_task = fd_do_task,
+ .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_plugin_info = fd_get_plugin_info,
+ .get_hba_info = fd_get_hba_info,
+ .get_dev_info = fd_get_dev_info,
+ .check_lba = fd_check_lba,
+ .check_for_SG = fd_check_for_SG,
+ .get_cdb = fd_get_cdb,
+ .get_blocksize = fd_get_blocksize,
+ .get_device_rev = fd_get_device_rev,
+ .get_device_type = fd_get_device_type,
+ .get_dma_length = fd_get_dma_length,
+ .get_max_sectors = fd_get_max_sectors,
+ .get_queue_depth = fd_get_queue_depth,
+ .get_max_queue_depth = fd_get_max_queue_depth,
+ .write_pending = NULL,
+};
+
+int __init fileio_module_init(void)
+{
+ int ret;
+
+ INIT_LIST_HEAD(&fileio_template.sub_api_list);
+
+ ret = transport_subsystem_register(&fileio_template, THIS_MODULE);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+void fileio_module_exit(void)
+{
+ transport_subsystem_release(&fileio_template);
+}
+
+MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
+MODULE_AUTHOR("nab@...ux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(fileio_module_init);
+module_exit(fileio_module_exit);
diff --git a/drivers/target/target_core_file.h b/drivers/target/target_core_file.h
new file mode 100644
index 0000000..3c97ca3
--- /dev/null
+++ b/drivers/target/target_core_file.h
@@ -0,0 +1,81 @@
+#ifndef TARGET_CORE_FILE_H
+#define TARGET_CORE_FILE_H
+
+#define FD_VERSION "4.0"
+
+#define FD_MAX_DEV_NAME 256
+/* Maximum queuedepth for the FILEIO HBA */
+#define FD_HBA_QUEUE_DEPTH 256
+#define FD_DEVICE_QUEUE_DEPTH 32
+#define FD_MAX_DEVICE_QUEUE_DEPTH 128
+#define FD_BLOCKSIZE 512
+#define FD_MAX_SECTORS 1024
+
+#define FD_DATA_READ 1
+#define FD_DATA_WRITE 2
+#define FD_DATA_NONE 3
+
+extern struct se_global *se_global;
+extern struct block_device *__linux_blockdevice_claim(int, int, void *, int *);
+extern struct block_device *linux_blockdevice_claim(int, int, void *);
+extern int linux_blockdevice_release(int, int, struct block_device *);
+extern int linux_blockdevice_check(int, int);
+
+#define RRF_EMULATE_CDB 0x01
+#define RRF_GOT_LBA 0x02
+
+struct fd_request {
+ /* SCSI CDB from iSCSI Command PDU */
+ unsigned char fd_scsi_cdb[SCSI_CDB_SIZE];
+ /* Data Direction */
+ u8 fd_data_direction;
+ /* Total length of request */
+ u32 fd_bufflen;
+ /* RD request flags */
+ u32 fd_req_flags;
+ /* Offset from start of page */
+ u32 fd_offset;
+ u32 fd_cur_size;
+ u32 fd_cur_offset;
+ /* Scatterlist count */
+ u32 fd_sg_count;
+ /* Logical Block Address */
+ unsigned long long fd_lba;
+ u64 fd_size;
+ struct kiocb fd_iocb;
+ struct iovec *fd_iovs;
+ /* Data buffer containing scatterlists(s) or contingous
+ memory segments */
+ void *fd_buf;
+ /* FILEIO device */
+ struct fd_dev *fd_dev;
+} ____cacheline_aligned;
+
+#define FBDF_HAS_PATH 0x01
+#define FBDF_HAS_SIZE 0x02
+#define FDBD_USE_BUFFERED_IO 0x04
+
+struct fd_dev {
+ u32 fbd_flags;
+ unsigned char fd_dev_name[FD_MAX_DEV_NAME];
+ /* Unique Ramdisk Device ID in Ramdisk HBA */
+ u32 fd_dev_id;
+ /* Number of SG tables in sg_table_array */
+ u32 fd_table_count;
+ u32 fd_queue_depth;
+ u32 fd_block_size;
+ unsigned long long fd_dev_size;
+ struct file *fd_file;
+ /* FILEIO HBA device is connected to */
+ struct fd_host *fd_host;
+ int (*fd_do_read)(struct fd_request *, struct se_task *);
+ int (*fd_do_write)(struct fd_request *, struct se_task *);
+} ____cacheline_aligned;
+
+struct fd_host {
+ u32 fd_host_dev_id_count;
+ /* Unique FILEIO Host ID */
+ u32 fd_host_id;
+} ____cacheline_aligned;
+
+#endif /* TARGET_CORE_FILE_H */
--
1.7.2.2
--
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