mirror of
https://github.com/torvalds/linux.git
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6b9a44d093
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
1026 lines
26 KiB
C
1026 lines
26 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 2005-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/timer.h>
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#include <linux/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 <linux/falloc.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_backend_configfs.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\n",
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hba->hba_id, fd_host->fd_host_id);
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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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fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
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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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/*
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* Check if the underlying struct block_device request_queue supports
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* the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
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* in ATA and we need to set TPE=1
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*/
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if (blk_queue_discard(q)) {
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dev->dev_attrib.max_unmap_lba_count =
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q->limits.max_discard_sectors;
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/*
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* Currently hardcoded to 1 in Linux/SCSI code..
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*/
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dev->dev_attrib.max_unmap_block_desc_count = 1;
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dev->dev_attrib.unmap_granularity =
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q->limits.discard_granularity >> 9;
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dev->dev_attrib.unmap_granularity_alignment =
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q->limits.discard_alignment;
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pr_debug("IFILE: BLOCK Discard support available,"
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" disabled by default\n");
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}
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/*
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* Enable write same emulation for IBLOCK and use 0xFFFF as
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* the smaller WRITE_SAME(10) only has a two-byte block count.
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*/
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dev->dev_attrib.max_write_same_len = 0xFFFF;
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if (blk_queue_nonrot(q))
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dev->dev_attrib.is_nonrot = 1;
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} 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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fd_dev->fd_block_size = FD_BLOCKSIZE;
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/*
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* Limit UNMAP emulation to 8k Number of LBAs (NoLB)
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*/
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dev->dev_attrib.max_unmap_lba_count = 0x2000;
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/*
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* Currently hardcoded to 1 in Linux/SCSI code..
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*/
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dev->dev_attrib.max_unmap_block_desc_count = 1;
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dev->dev_attrib.unmap_granularity = 1;
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dev->dev_attrib.unmap_granularity_alignment = 0;
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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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}
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dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
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dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
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dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_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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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_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot,
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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 *prot_fd = dev->fd_prot_file;
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struct scatterlist *sg;
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loff_t pos = (cmd->t_task_lba * se_dev->prot_length);
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unsigned char *buf;
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u32 prot_size, len, size;
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int rc, ret = 1, i;
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prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) *
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se_dev->prot_length;
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if (!is_write) {
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fd_prot->prot_buf = vzalloc(prot_size);
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if (!fd_prot->prot_buf) {
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pr_err("Unable to allocate fd_prot->prot_buf\n");
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return -ENOMEM;
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}
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buf = fd_prot->prot_buf;
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fd_prot->prot_sg_nents = cmd->t_prot_nents;
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fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) *
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fd_prot->prot_sg_nents, GFP_KERNEL);
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if (!fd_prot->prot_sg) {
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pr_err("Unable to allocate fd_prot->prot_sg\n");
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vfree(fd_prot->prot_buf);
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return -ENOMEM;
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}
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size = prot_size;
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for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) {
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len = min_t(u32, PAGE_SIZE, size);
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sg_set_buf(sg, buf, len);
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size -= len;
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buf += len;
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}
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}
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if (is_write) {
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rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos);
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if (rc < 0 || prot_size != rc) {
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pr_err("kernel_write() for fd_do_prot_rw failed:"
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" %d\n", rc);
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ret = -EINVAL;
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}
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} else {
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rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size);
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if (rc < 0) {
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pr_err("kernel_read() for fd_do_prot_rw failed:"
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" %d\n", rc);
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ret = -EINVAL;
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}
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}
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if (is_write || ret < 0) {
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kfree(fd_prot->prot_sg);
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vfree(fd_prot->prot_buf);
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}
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return ret;
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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 iov_iter iter;
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struct bio_vec *bvec;
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ssize_t len = 0;
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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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bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
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if (!bvec) {
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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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bvec[i].bv_page = sg_page(sg);
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bvec[i].bv_len = sg->length;
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bvec[i].bv_offset = sg->offset;
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len += sg->length;
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}
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iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
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if (is_write)
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ret = vfs_iter_write(fd, &iter, &pos);
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else
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ret = vfs_iter_read(fd, &iter, &pos);
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kfree(bvec);
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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(file_inode(fd)->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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|
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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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/*
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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 - 1;
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else
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end = LLONG_MAX;
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}
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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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|
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if (immed)
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return 0;
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|
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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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|
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return 0;
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}
|
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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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|
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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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|
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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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}
|
|
/*
|
|
* Fill local *buf to contain multiple WRITE_SAME blocks up to
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* min(len, PAGE_SIZE)
|
|
*/
|
|
p = buf;
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end = min_t(unsigned int, len, PAGE_SIZE);
|
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|
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while (i < end) {
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memcpy(p, kmap_buf, block_size);
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|
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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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|
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return buf;
|
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}
|
|
|
|
static sense_reason_t
|
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fd_execute_write_same(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *se_dev = cmd->se_dev;
|
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struct fd_dev *fd_dev = FD_DEV(se_dev);
|
|
struct file *f = fd_dev->fd_file;
|
|
struct scatterlist *sg;
|
|
struct iovec *iov;
|
|
mm_segment_t old_fs;
|
|
sector_t nolb = sbc_get_write_same_sectors(cmd);
|
|
loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
|
|
unsigned int len, len_tmp, iov_num;
|
|
int i, rc;
|
|
unsigned char *buf;
|
|
|
|
if (!nolb) {
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
if (cmd->prot_op) {
|
|
pr_err("WRITE_SAME: Protection information with FILEIO"
|
|
" backends not supported\n");
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
sg = &cmd->t_data_sg[0];
|
|
|
|
if (cmd->t_data_nents > 1 ||
|
|
sg->length != cmd->se_dev->dev_attrib.block_size) {
|
|
pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
|
|
" block_size: %u\n", cmd->t_data_nents, sg->length,
|
|
cmd->se_dev->dev_attrib.block_size);
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
len = len_tmp = nolb * se_dev->dev_attrib.block_size;
|
|
iov_num = DIV_ROUND_UP(len, PAGE_SIZE);
|
|
|
|
buf = fd_setup_write_same_buf(cmd, sg, len);
|
|
if (!buf)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
iov = vzalloc(sizeof(struct iovec) * iov_num);
|
|
if (!iov) {
|
|
pr_err("Unable to allocate fd_execute_write_same iovecs\n");
|
|
kfree(buf);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
/*
|
|
* Map the single fabric received scatterlist block now populated
|
|
* in *buf into each iovec for I/O submission.
|
|
*/
|
|
for (i = 0; i < iov_num; i++) {
|
|
iov[i].iov_base = buf;
|
|
iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE);
|
|
len_tmp -= iov[i].iov_len;
|
|
}
|
|
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
rc = vfs_writev(f, &iov[0], iov_num, &pos);
|
|
set_fs(old_fs);
|
|
|
|
vfree(iov);
|
|
kfree(buf);
|
|
|
|
if (rc < 0 || rc != len) {
|
|
pr_err("vfs_writev() returned %d for write same\n", rc);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
static sense_reason_t
|
|
fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb)
|
|
{
|
|
struct file *file = priv;
|
|
struct inode *inode = file->f_mapping->host;
|
|
int ret;
|
|
|
|
if (S_ISBLK(inode->i_mode)) {
|
|
/* The backend is block device, use discard */
|
|
struct block_device *bdev = inode->i_bdev;
|
|
|
|
ret = blkdev_issue_discard(bdev, lba,
|
|
nolb, GFP_KERNEL, 0);
|
|
if (ret < 0) {
|
|
pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
|
|
ret);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
} else {
|
|
/* The backend is normal file, use fallocate */
|
|
struct se_device *se_dev = cmd->se_dev;
|
|
loff_t pos = lba * se_dev->dev_attrib.block_size;
|
|
unsigned int len = nolb * se_dev->dev_attrib.block_size;
|
|
int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
|
|
|
|
if (!file->f_op->fallocate)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
ret = file->f_op->fallocate(file, mode, pos, len);
|
|
if (ret < 0) {
|
|
pr_warn("FILEIO: fallocate() failed: %d\n", ret);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static sense_reason_t
|
|
fd_execute_write_same_unmap(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *se_dev = cmd->se_dev;
|
|
struct fd_dev *fd_dev = FD_DEV(se_dev);
|
|
struct file *file = fd_dev->fd_file;
|
|
sector_t lba = cmd->t_task_lba;
|
|
sector_t nolb = sbc_get_write_same_sectors(cmd);
|
|
int ret;
|
|
|
|
if (!nolb) {
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
ret = fd_do_unmap(cmd, file, lba, nolb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
target_complete_cmd(cmd, GOOD);
|
|
return 0;
|
|
}
|
|
|
|
static sense_reason_t
|
|
fd_execute_unmap(struct se_cmd *cmd)
|
|
{
|
|
struct file *file = FD_DEV(cmd->se_dev)->fd_file;
|
|
|
|
return sbc_execute_unmap(cmd, fd_do_unmap, file);
|
|
}
|
|
|
|
static sense_reason_t
|
|
fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct fd_prot fd_prot;
|
|
sense_reason_t rc;
|
|
int ret = 0;
|
|
/*
|
|
* We are currently limited by the number of iovecs (2048) per
|
|
* single vfs_[writev,readv] call.
|
|
*/
|
|
if (cmd->data_length > FD_MAX_BYTES) {
|
|
pr_err("FILEIO: Not able to process I/O of %u bytes due to"
|
|
"FD_MAX_BYTES: %u iovec count limitiation\n",
|
|
cmd->data_length, FD_MAX_BYTES);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
/*
|
|
* Call vectorized fileio functions to map struct scatterlist
|
|
* physical memory addresses to struct iovec virtual memory.
|
|
*/
|
|
if (data_direction == DMA_FROM_DEVICE) {
|
|
memset(&fd_prot, 0, sizeof(struct fd_prot));
|
|
|
|
if (cmd->prot_type) {
|
|
ret = fd_do_prot_rw(cmd, &fd_prot, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
|
|
|
|
if (ret > 0 && cmd->prot_type) {
|
|
u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
|
|
|
|
rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors,
|
|
0, fd_prot.prot_sg, 0);
|
|
if (rc) {
|
|
kfree(fd_prot.prot_sg);
|
|
vfree(fd_prot.prot_buf);
|
|
return rc;
|
|
}
|
|
kfree(fd_prot.prot_sg);
|
|
vfree(fd_prot.prot_buf);
|
|
}
|
|
} else {
|
|
memset(&fd_prot, 0, sizeof(struct fd_prot));
|
|
|
|
if (cmd->prot_type) {
|
|
u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
|
|
|
|
ret = fd_do_prot_rw(cmd, &fd_prot, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors,
|
|
0, fd_prot.prot_sg, 0);
|
|
if (rc) {
|
|
kfree(fd_prot.prot_sg);
|
|
vfree(fd_prot.prot_buf);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
|
|
/*
|
|
* Perform implicit vfs_fsync_range() for fd_do_writev() ops
|
|
* for SCSI WRITEs with Forced Unit Access (FUA) set.
|
|
* Allow this to happen independent of WCE=0 setting.
|
|
*/
|
|
if (ret > 0 &&
|
|
dev->dev_attrib.emulate_fua_write > 0 &&
|
|
(cmd->se_cmd_flags & SCF_FUA)) {
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
loff_t start = cmd->t_task_lba *
|
|
dev->dev_attrib.block_size;
|
|
loff_t end;
|
|
|
|
if (cmd->data_length)
|
|
end = start + cmd->data_length - 1;
|
|
else
|
|
end = LLONG_MAX;
|
|
|
|
vfs_fsync_range(fd_dev->fd_file, start, end, 1);
|
|
}
|
|
|
|
if (ret > 0 && cmd->prot_type) {
|
|
ret = fd_do_prot_rw(cmd, &fd_prot, true);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
}
|
|
|
|
if (ret < 0) {
|
|
kfree(fd_prot.prot_sg);
|
|
vfree(fd_prot.prot_buf);
|
|
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 = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
|
|
kfree(arg_p);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoull() 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:
|
|
ret = match_int(args, &arg);
|
|
if (ret)
|
|
goto out;
|
|
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);
|
|
else
|
|
dev_size = fd_dev->fd_dev_size;
|
|
|
|
return div_u64(dev_size - dev->dev_attrib.block_size,
|
|
dev->dev_attrib.block_size);
|
|
}
|
|
|
|
static int fd_init_prot(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
struct file *prot_file, *file = fd_dev->fd_file;
|
|
struct inode *inode;
|
|
int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
|
|
char buf[FD_MAX_DEV_PROT_NAME];
|
|
|
|
if (!file) {
|
|
pr_err("Unable to locate fd_dev->fd_file\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
inode = file->f_mapping->host;
|
|
if (S_ISBLK(inode->i_mode)) {
|
|
pr_err("FILEIO Protection emulation only supported on"
|
|
" !S_ISBLK\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
|
|
flags &= ~O_DSYNC;
|
|
|
|
snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
|
|
fd_dev->fd_dev_name);
|
|
|
|
prot_file = filp_open(buf, flags, 0600);
|
|
if (IS_ERR(prot_file)) {
|
|
pr_err("filp_open(%s) failed\n", buf);
|
|
ret = PTR_ERR(prot_file);
|
|
return ret;
|
|
}
|
|
fd_dev->fd_prot_file = prot_file;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fd_format_prot(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
struct file *prot_fd = fd_dev->fd_prot_file;
|
|
sector_t prot_length, prot;
|
|
unsigned char *buf;
|
|
loff_t pos = 0;
|
|
int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
|
|
int rc, ret = 0, size, len;
|
|
|
|
if (!dev->dev_attrib.pi_prot_type) {
|
|
pr_err("Unable to format_prot while pi_prot_type == 0\n");
|
|
return -ENODEV;
|
|
}
|
|
if (!prot_fd) {
|
|
pr_err("Unable to locate fd_dev->fd_prot_file\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
buf = vzalloc(unit_size);
|
|
if (!buf) {
|
|
pr_err("Unable to allocate FILEIO prot buf\n");
|
|
return -ENOMEM;
|
|
}
|
|
prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length;
|
|
size = prot_length;
|
|
|
|
pr_debug("Using FILEIO prot_length: %llu\n",
|
|
(unsigned long long)prot_length);
|
|
|
|
memset(buf, 0xff, unit_size);
|
|
for (prot = 0; prot < prot_length; prot += unit_size) {
|
|
len = min(unit_size, size);
|
|
rc = kernel_write(prot_fd, buf, len, pos);
|
|
if (rc != len) {
|
|
pr_err("vfs_write to prot file failed: %d\n", rc);
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
pos += len;
|
|
size -= len;
|
|
}
|
|
|
|
out:
|
|
vfree(buf);
|
|
return ret;
|
|
}
|
|
|
|
static void fd_free_prot(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = FD_DEV(dev);
|
|
|
|
if (!fd_dev->fd_prot_file)
|
|
return;
|
|
|
|
filp_close(fd_dev->fd_prot_file, NULL);
|
|
fd_dev->fd_prot_file = NULL;
|
|
}
|
|
|
|
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,
|
|
.execute_write_same_unmap = fd_execute_write_same_unmap,
|
|
.execute_unmap = fd_execute_unmap,
|
|
};
|
|
|
|
static sense_reason_t
|
|
fd_parse_cdb(struct se_cmd *cmd)
|
|
{
|
|
return sbc_parse_cdb(cmd, &fd_sbc_ops);
|
|
}
|
|
|
|
DEF_TB_DEFAULT_ATTRIBS(fileio);
|
|
|
|
static struct configfs_attribute *fileio_backend_dev_attrs[] = {
|
|
&fileio_dev_attrib_emulate_model_alias.attr,
|
|
&fileio_dev_attrib_emulate_dpo.attr,
|
|
&fileio_dev_attrib_emulate_fua_write.attr,
|
|
&fileio_dev_attrib_emulate_fua_read.attr,
|
|
&fileio_dev_attrib_emulate_write_cache.attr,
|
|
&fileio_dev_attrib_emulate_ua_intlck_ctrl.attr,
|
|
&fileio_dev_attrib_emulate_tas.attr,
|
|
&fileio_dev_attrib_emulate_tpu.attr,
|
|
&fileio_dev_attrib_emulate_tpws.attr,
|
|
&fileio_dev_attrib_emulate_caw.attr,
|
|
&fileio_dev_attrib_emulate_3pc.attr,
|
|
&fileio_dev_attrib_pi_prot_type.attr,
|
|
&fileio_dev_attrib_hw_pi_prot_type.attr,
|
|
&fileio_dev_attrib_pi_prot_format.attr,
|
|
&fileio_dev_attrib_enforce_pr_isids.attr,
|
|
&fileio_dev_attrib_is_nonrot.attr,
|
|
&fileio_dev_attrib_emulate_rest_reord.attr,
|
|
&fileio_dev_attrib_force_pr_aptpl.attr,
|
|
&fileio_dev_attrib_hw_block_size.attr,
|
|
&fileio_dev_attrib_block_size.attr,
|
|
&fileio_dev_attrib_hw_max_sectors.attr,
|
|
&fileio_dev_attrib_optimal_sectors.attr,
|
|
&fileio_dev_attrib_hw_queue_depth.attr,
|
|
&fileio_dev_attrib_queue_depth.attr,
|
|
&fileio_dev_attrib_max_unmap_lba_count.attr,
|
|
&fileio_dev_attrib_max_unmap_block_desc_count.attr,
|
|
&fileio_dev_attrib_unmap_granularity.attr,
|
|
&fileio_dev_attrib_unmap_granularity_alignment.attr,
|
|
&fileio_dev_attrib_max_write_same_len.attr,
|
|
NULL,
|
|
};
|
|
|
|
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,
|
|
.init_prot = fd_init_prot,
|
|
.format_prot = fd_format_prot,
|
|
.free_prot = fd_free_prot,
|
|
};
|
|
|
|
static int __init fileio_module_init(void)
|
|
{
|
|
struct target_backend_cits *tbc = &fileio_template.tb_cits;
|
|
|
|
target_core_setup_sub_cits(&fileio_template);
|
|
tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs;
|
|
|
|
return transport_subsystem_register(&fileio_template);
|
|
}
|
|
|
|
static void __exit 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);
|