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https://github.com/edk2-porting/linux-next.git
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7b745c84a9
This patch adds support for emulation of WRITE_SAME w/ UNMAP=0 within fd_execute_write_same() backend code. The emulation uses vfs_writev() to submit a locally populated buffer from the received WRITE_SAME scatterlist block for duplication, and by default enforces a limit of max_write_same_len=0x1000 (8192) sectors up to the limit of 1024 iovec entries for the single call to vfs_writev(). It also sets max_write_same_len to the operational default at setup -> fd_configure_device() time. Tested with 512, 1k, 2k, and 4k block_sizes. (asias: convert to vzalloc) Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
645 lines
16 KiB
C
645 lines
16 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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* (c) Copyright 2005-2012 RisingTide Systems LLC.
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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/blkdev.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include "target_core_file.h"
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static inline struct fd_dev *FD_DEV(struct se_device *dev)
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{
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return container_of(dev, struct fd_dev, dev);
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}
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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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pr_err("Unable to allocate memory for struct fd_host\n");
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return -ENOMEM;
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}
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fd_host->fd_host_id = host_id;
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hba->hba_ptr = fd_host;
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pr_debug("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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pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
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" MaxSectors: %u\n",
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hba->hba_id, fd_host->fd_host_id, 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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pr_debug("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 struct se_device *fd_alloc_device(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 = 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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pr_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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pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
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return &fd_dev->dev;
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}
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static int fd_configure_device(struct se_device *dev)
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{
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struct fd_dev *fd_dev = FD_DEV(dev);
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struct fd_host *fd_host = dev->se_hba->hba_ptr;
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struct file *file;
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struct inode *inode = NULL;
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int flags, ret = -EINVAL;
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if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
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pr_err("Missing fd_dev_name=\n");
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return -EINVAL;
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}
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/*
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* Use O_DSYNC by default instead of O_SYNC to forgo syncing
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* of pure timestamp updates.
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*/
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flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
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/*
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* Optionally allow fd_buffered_io=1 to be enabled for people
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* who want use the fs buffer cache as an WriteCache mechanism.
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*
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* This means that in event of a hard failure, there is a risk
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* of silent data-loss if the SCSI client has *not* performed a
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* forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
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* to write-out the entire device cache.
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*/
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if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
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pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
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flags &= ~O_DSYNC;
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}
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file = filp_open(fd_dev->fd_dev_name, flags, 0600);
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if (IS_ERR(file)) {
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pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
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ret = PTR_ERR(file);
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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 = bdev_get_queue(inode->i_bdev);
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unsigned long long dev_size;
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dev->dev_attrib.hw_block_size =
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bdev_logical_block_size(inode->i_bdev);
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dev->dev_attrib.hw_max_sectors = queue_max_hw_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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dev_size = (i_size_read(file->f_mapping->host) -
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fd_dev->fd_block_size);
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pr_debug("FILEIO: Using size: %llu bytes from struct"
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" block_device blocks: %llu logical_block_size: %d\n",
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dev_size, div_u64(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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pr_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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dev->dev_attrib.hw_block_size = FD_BLOCKSIZE;
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dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS;
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}
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fd_dev->fd_block_size = dev->dev_attrib.hw_block_size;
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dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
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if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
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pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
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" with FDBD_HAS_BUFFERED_IO_WCE\n");
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dev->dev_attrib.emulate_write_cache = 1;
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}
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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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/*
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* Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
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* based upon struct iovec limit for vfs_writev()
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*/
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dev->dev_attrib.max_write_same_len = 0x1000;
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pr_debug("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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return 0;
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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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return ret;
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}
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static void fd_free_device(struct se_device *dev)
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{
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struct fd_dev *fd_dev = FD_DEV(dev);
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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 int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
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u32 sgl_nents, int is_write)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct fd_dev *dev = FD_DEV(se_dev);
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struct file *fd = dev->fd_file;
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struct scatterlist *sg;
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struct iovec *iov;
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mm_segment_t old_fs;
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loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
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int ret = 0, i;
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iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
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if (!iov) {
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pr_err("Unable to allocate fd_do_readv iov[]\n");
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return -ENOMEM;
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}
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for_each_sg(sgl, sg, sgl_nents, i) {
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iov[i].iov_len = sg->length;
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iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
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}
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old_fs = get_fs();
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set_fs(get_ds());
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if (is_write)
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ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
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else
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ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
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set_fs(old_fs);
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for_each_sg(sgl, sg, sgl_nents, i)
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kunmap(sg_page(sg));
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kfree(iov);
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if (is_write) {
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if (ret < 0 || ret != cmd->data_length) {
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pr_err("%s() write returned %d\n", __func__, ret);
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return (ret < 0 ? ret : -EINVAL);
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}
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} else {
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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 != cmd->data_length) {
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pr_err("%s() returned %d, expecting %u for "
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"S_ISBLK\n", __func__, ret,
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cmd->data_length);
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return (ret < 0 ? ret : -EINVAL);
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}
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} else {
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if (ret < 0) {
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pr_err("%s() returned %d for non S_ISBLK\n",
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__func__, ret);
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return ret;
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}
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}
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}
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return 1;
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}
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static sense_reason_t
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fd_execute_sync_cache(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct fd_dev *fd_dev = FD_DEV(dev);
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int immed = (cmd->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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target_complete_cmd(cmd, SAM_STAT_GOOD);
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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_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_lba * dev->dev_attrib.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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pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
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if (immed)
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return 0;
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if (ret)
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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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return 0;
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}
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static unsigned char *
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fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg,
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unsigned int len)
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{
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struct se_device *se_dev = cmd->se_dev;
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unsigned int block_size = se_dev->dev_attrib.block_size;
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unsigned int i = 0, end;
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unsigned char *buf, *p, *kmap_buf;
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buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL);
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if (!buf) {
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pr_err("Unable to allocate fd_execute_write_same buf\n");
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return NULL;
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}
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kmap_buf = kmap(sg_page(sg)) + sg->offset;
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if (!kmap_buf) {
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pr_err("kmap() failed in fd_setup_write_same\n");
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kfree(buf);
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return NULL;
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}
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/*
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* Fill local *buf to contain multiple WRITE_SAME blocks up to
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* min(len, PAGE_SIZE)
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*/
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p = buf;
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end = min_t(unsigned int, len, PAGE_SIZE);
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while (i < end) {
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memcpy(p, kmap_buf, block_size);
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i += block_size;
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p += block_size;
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}
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kunmap(sg_page(sg));
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return buf;
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}
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static sense_reason_t
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fd_execute_write_same(struct se_cmd *cmd)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct fd_dev *fd_dev = FD_DEV(se_dev);
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struct file *f = fd_dev->fd_file;
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struct scatterlist *sg;
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struct iovec *iov;
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mm_segment_t old_fs;
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sector_t nolb = spc_get_write_same_sectors(cmd);
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loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
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unsigned int len, len_tmp, iov_num;
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int i, rc;
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unsigned char *buf;
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if (!nolb) {
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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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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len = len_tmp = nolb * se_dev->dev_attrib.block_size;
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iov_num = DIV_ROUND_UP(len, PAGE_SIZE);
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buf = fd_setup_write_same_buf(cmd, sg, len);
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if (!buf)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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iov = vzalloc(sizeof(struct iovec) * iov_num);
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if (!iov) {
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pr_err("Unable to allocate fd_execute_write_same iovecs\n");
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kfree(buf);
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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/*
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* Map the single fabric received scatterlist block now populated
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* in *buf into each iovec for I/O submission.
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*/
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for (i = 0; i < iov_num; i++) {
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iov[i].iov_base = buf;
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iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE);
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len_tmp -= iov[i].iov_len;
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}
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old_fs = get_fs();
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set_fs(get_ds());
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rc = vfs_writev(f, &iov[0], iov_num, &pos);
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set_fs(old_fs);
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vfree(iov);
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kfree(buf);
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if (rc < 0 || rc != len) {
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pr_err("vfs_writev() returned %d for write same\n", rc);
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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static sense_reason_t
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fd_execute_rw(struct se_cmd *cmd)
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{
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struct scatterlist *sgl = cmd->t_data_sg;
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u32 sgl_nents = cmd->t_data_nents;
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enum dma_data_direction data_direction = cmd->data_direction;
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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 (data_direction == DMA_FROM_DEVICE) {
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ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
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} else {
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ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
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/*
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* Perform implict vfs_fsync_range() for fd_do_writev() ops
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* for SCSI WRITEs with Forced Unit Access (FUA) set.
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* Allow this to happen independent of WCE=0 setting.
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*/
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if (ret > 0 &&
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dev->dev_attrib.emulate_fua_write > 0 &&
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(cmd->se_cmd_flags & SCF_FUA)) {
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struct fd_dev *fd_dev = FD_DEV(dev);
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loff_t start = cmd->t_task_lba *
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dev->dev_attrib.block_size;
|
|
loff_t end = start + cmd->data_length;
|
|
|
|
vfs_fsync_range(fd_dev->fd_file, start, end, 1);
|
|
}
|
|
}
|
|
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
if (ret)
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
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_device *dev,
|
|
const char *page, ssize_t count)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
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, ",\n")) != NULL) {
|
|
if (!*ptr)
|
|
continue;
|
|
|
|
token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_fd_dev_name:
|
|
if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
|
|
FD_MAX_DEV_NAME) == 0) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
pr_debug("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) {
|
|
pr_err("strict_strtoull() failed for"
|
|
" fd_dev_size=\n");
|
|
goto out;
|
|
}
|
|
pr_debug("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) {
|
|
pr_err("bogus fd_buffered_io=%d value\n", arg);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pr_debug("FILEIO: Using buffered I/O"
|
|
" operations for struct fd_dev\n");
|
|
|
|
fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
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_HAS_BUFFERED_IO_WCE) ?
|
|
"Buffered-WCE" : "O_DSYNC");
|
|
return bl;
|
|
}
|
|
|
|
static sector_t fd_get_blocks(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
struct file *f = fd_dev->fd_file;
|
|
struct inode *i = f->f_mapping->host;
|
|
unsigned long long dev_size;
|
|
/*
|
|
* When using a file that references an underlying struct block_device,
|
|
* ensure dev_size is always based on the current inode size in order
|
|
* to handle underlying block_device resize operations.
|
|
*/
|
|
if (S_ISBLK(i->i_mode))
|
|
dev_size = (i_size_read(i) - fd_dev->fd_block_size);
|
|
else
|
|
dev_size = fd_dev->fd_dev_size;
|
|
|
|
return div_u64(dev_size, dev->dev_attrib.block_size);
|
|
}
|
|
|
|
static struct sbc_ops fd_sbc_ops = {
|
|
.execute_rw = fd_execute_rw,
|
|
.execute_sync_cache = fd_execute_sync_cache,
|
|
.execute_write_same = fd_execute_write_same,
|
|
};
|
|
|
|
static sense_reason_t
|
|
fd_parse_cdb(struct se_cmd *cmd)
|
|
{
|
|
return sbc_parse_cdb(cmd, &fd_sbc_ops);
|
|
}
|
|
|
|
static struct se_subsystem_api fileio_template = {
|
|
.name = "fileio",
|
|
.inquiry_prod = "FILEIO",
|
|
.inquiry_rev = FD_VERSION,
|
|
.owner = THIS_MODULE,
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
|
|
.attach_hba = fd_attach_hba,
|
|
.detach_hba = fd_detach_hba,
|
|
.alloc_device = fd_alloc_device,
|
|
.configure_device = fd_configure_device,
|
|
.free_device = fd_free_device,
|
|
.parse_cdb = fd_parse_cdb,
|
|
.set_configfs_dev_params = fd_set_configfs_dev_params,
|
|
.show_configfs_dev_params = fd_show_configfs_dev_params,
|
|
.get_device_type = sbc_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);
|