![Nicholas Bellinger](/assets/img/avatar_default.png)
Convert to use O_DSYNC for all cases at FILEIO backend creation time to avoid the extra syncing of pure timestamp updates with legacy O_SYNC during default operation as recommended by hch. Continue to do this independently of Write Cache Enable (WCE) bit, as WCE=0 is currently the default for all backend devices and enabled by user on per device basis via attrib/emulate_write_cache. This patch drops the now unnecessary fd_buffered_io= token usage that was originally signalling when to explictly disable O_SYNC at backend creation time for buffered I/O operation. This can end up being dangerous for a number of reasons during physical node failure, so go ahead and drop this option for now when O_DSYNC is used as the default. Also allow explict FUA WRITEs -> vfs_fsync_range() call to function in fd_execute_cmd() independently of WCE bit setting. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: <stable@vger.kernel.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
590 lines
15 KiB
C
590 lines
15 KiB
C
/*******************************************************************************
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* Filename: target_core_file.c
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*
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* This file contains the Storage Engine <-> FILEIO transport specific functions
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*
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* Copyright (c) 2005 PyX Technologies, Inc.
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* Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/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 struct se_subsystem_api fileio_template;
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/* fd_attach_hba(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static int fd_attach_hba(struct se_hba *hba, u32 host_id)
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{
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struct fd_host *fd_host;
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fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
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if (!fd_host) {
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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 void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
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{
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struct fd_dev *fd_dev;
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struct fd_host *fd_host = 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;
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}
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/* fd_create_virtdevice(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static struct se_device *fd_create_virtdevice(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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void *p)
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{
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char *dev_p = NULL;
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struct se_device *dev;
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struct se_dev_limits dev_limits;
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struct queue_limits *limits;
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struct fd_dev *fd_dev = p;
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struct fd_host *fd_host = hba->hba_ptr;
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mm_segment_t old_fs;
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struct file *file;
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struct inode *inode = NULL;
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int dev_flags = 0, flags, ret = -EINVAL;
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memset(&dev_limits, 0, sizeof(struct se_dev_limits));
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old_fs = get_fs();
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set_fs(get_ds());
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dev_p = getname(fd_dev->fd_dev_name);
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set_fs(old_fs);
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if (IS_ERR(dev_p)) {
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pr_err("getname(%s) failed: %lu\n",
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fd_dev->fd_dev_name, IS_ERR(dev_p));
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ret = PTR_ERR(dev_p);
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goto fail;
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}
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/*
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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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file = filp_open(dev_p, flags, 0600);
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if (IS_ERR(file)) {
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pr_err("filp_open(%s) failed\n", dev_p);
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ret = PTR_ERR(file);
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goto fail;
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}
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if (!file || !file->f_dentry) {
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pr_err("filp_open(%s) failed\n", dev_p);
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goto fail;
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}
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fd_dev->fd_file = file;
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/*
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* If using a block backend with this struct file, we extract
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* fd_dev->fd_[block,dev]_size from struct block_device.
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*
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* Otherwise, we use the passed fd_size= from configfs
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*/
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inode = file->f_mapping->host;
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if (S_ISBLK(inode->i_mode)) {
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struct request_queue *q;
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unsigned long long dev_size;
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/*
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* Setup the local scope queue_limits from struct request_queue->limits
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* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
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*/
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q = bdev_get_queue(inode->i_bdev);
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limits = &dev_limits.limits;
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limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
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limits->max_hw_sectors = queue_max_hw_sectors(q);
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limits->max_sectors = queue_max_sectors(q);
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/*
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* Determine the number of bytes from i_size_read() minus
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* one (1) logical sector from underlying struct block_device
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*/
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fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
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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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limits = &dev_limits.limits;
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limits->logical_block_size = FD_BLOCKSIZE;
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limits->max_hw_sectors = FD_MAX_SECTORS;
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limits->max_sectors = FD_MAX_SECTORS;
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fd_dev->fd_block_size = FD_BLOCKSIZE;
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}
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dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
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dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
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dev = transport_add_device_to_core_hba(hba, &fileio_template,
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se_dev, dev_flags, fd_dev,
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&dev_limits, "FILEIO", FD_VERSION);
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if (!dev)
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goto fail;
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fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
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fd_dev->fd_queue_depth = dev->queue_depth;
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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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putname(dev_p);
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return dev;
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fail:
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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putname(dev_p);
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return ERR_PTR(ret);
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}
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/* fd_free_device(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static void fd_free_device(void *p)
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{
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struct fd_dev *fd_dev = p;
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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kfree(fd_dev);
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}
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static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
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u32 sgl_nents)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct fd_dev *dev = se_dev->dev_ptr;
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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 *
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se_dev->se_sub_dev->se_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 = sg_virt(sg);
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}
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old_fs = get_fs();
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set_fs(get_ds());
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ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
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set_fs(old_fs);
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kfree(iov);
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/*
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* Return zeros and GOOD status even if the READ did not return
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* the expected virt_size for struct file w/o a backing struct
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* block_device.
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*/
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if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
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if (ret < 0 || ret != cmd->data_length) {
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pr_err("vfs_readv() returned %d,"
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" expecting %d for S_ISBLK\n", ret,
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(int)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("vfs_readv() returned %d for non"
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" S_ISBLK\n", ret);
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return ret;
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}
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}
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return 1;
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}
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static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl,
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u32 sgl_nents)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct fd_dev *dev = se_dev->dev_ptr;
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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 *
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se_dev->se_sub_dev->se_dev_attrib.block_size);
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int ret, i = 0;
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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_writev 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 = sg_virt(sg);
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}
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old_fs = get_fs();
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set_fs(get_ds());
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ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
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set_fs(old_fs);
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kfree(iov);
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if (ret < 0 || ret != cmd->data_length) {
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pr_err("vfs_writev() returned %d\n", ret);
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return (ret < 0 ? ret : -EINVAL);
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}
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return 1;
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}
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static void fd_emulate_sync_cache(struct se_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 = dev->dev_ptr;
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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->se_sub_dev->se_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;
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if (ret) {
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cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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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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}
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static int fd_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
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u32 sgl_nents, enum dma_data_direction data_direction)
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{
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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_readv(cmd, sgl, sgl_nents);
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} else {
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ret = fd_do_writev(cmd, sgl, sgl_nents);
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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->se_sub_dev->se_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 = dev->dev_ptr;
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loff_t start = cmd->t_task_lba *
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dev->se_sub_dev->se_dev_attrib.block_size;
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loff_t end = start + cmd->data_length;
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vfs_fsync_range(fd_dev->fd_file, start, end, 1);
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}
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}
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if (ret < 0) {
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cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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return ret;
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}
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if (ret)
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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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enum {
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Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
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};
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static match_table_t tokens = {
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{Opt_fd_dev_name, "fd_dev_name=%s"},
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{Opt_fd_dev_size, "fd_dev_size=%s"},
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{Opt_err, NULL}
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};
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static ssize_t fd_set_configfs_dev_params(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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const char *page, ssize_t count)
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{
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struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
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char *orig, *ptr, *arg_p, *opts;
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substring_t args[MAX_OPT_ARGS];
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int ret = 0, token;
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opts = kstrdup(page, GFP_KERNEL);
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if (!opts)
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return -ENOMEM;
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orig = opts;
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while ((ptr = strsep(&opts, ",\n")) != NULL) {
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if (!*ptr)
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continue;
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token = match_token(ptr, tokens, args);
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switch (token) {
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case Opt_fd_dev_name:
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arg_p = match_strdup(&args[0]);
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if (!arg_p) {
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ret = -ENOMEM;
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break;
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}
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snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
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"%s", arg_p);
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kfree(arg_p);
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pr_debug("FILEIO: Referencing Path: %s\n",
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fd_dev->fd_dev_name);
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fd_dev->fbd_flags |= FBDF_HAS_PATH;
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break;
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case Opt_fd_dev_size:
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arg_p = match_strdup(&args[0]);
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if (!arg_p) {
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ret = -ENOMEM;
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break;
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}
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ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
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kfree(arg_p);
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if (ret < 0) {
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pr_err("strict_strtoull() failed for"
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|
" 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;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
|
|
{
|
|
struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
|
|
|
|
if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
|
|
pr_err("Missing fd_dev_name=\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t fd_show_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
char *b)
|
|
{
|
|
struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
|
|
ssize_t bl = 0;
|
|
|
|
bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
|
|
bl += sprintf(b + bl, " File: %s Size: %llu Mode: O_DSYNC\n",
|
|
fd_dev->fd_dev_name, fd_dev->fd_dev_size);
|
|
return bl;
|
|
}
|
|
|
|
/* fd_get_device_rev(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static u32 fd_get_device_rev(struct se_device *dev)
|
|
{
|
|
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
|
|
}
|
|
|
|
/* fd_get_device_type(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static u32 fd_get_device_type(struct se_device *dev)
|
|
{
|
|
return TYPE_DISK;
|
|
}
|
|
|
|
static sector_t fd_get_blocks(struct se_device *dev)
|
|
{
|
|
struct fd_dev *fd_dev = dev->dev_ptr;
|
|
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->se_sub_dev->se_dev_attrib.block_size);
|
|
}
|
|
|
|
static struct se_subsystem_api fileio_template = {
|
|
.name = "fileio",
|
|
.owner = THIS_MODULE,
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
|
|
.write_cache_emulated = 1,
|
|
.fua_write_emulated = 1,
|
|
.attach_hba = fd_attach_hba,
|
|
.detach_hba = fd_detach_hba,
|
|
.allocate_virtdevice = fd_allocate_virtdevice,
|
|
.create_virtdevice = fd_create_virtdevice,
|
|
.free_device = fd_free_device,
|
|
.execute_cmd = fd_execute_cmd,
|
|
.do_sync_cache = fd_emulate_sync_cache,
|
|
.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_device_rev = fd_get_device_rev,
|
|
.get_device_type = fd_get_device_type,
|
|
.get_blocks = fd_get_blocks,
|
|
};
|
|
|
|
static int __init fileio_module_init(void)
|
|
{
|
|
return transport_subsystem_register(&fileio_template);
|
|
}
|
|
|
|
static void fileio_module_exit(void)
|
|
{
|
|
transport_subsystem_release(&fileio_template);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
|
|
MODULE_AUTHOR("nab@Linux-iSCSI.org");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(fileio_module_init);
|
|
module_exit(fileio_module_exit);
|