1c66ac9dbSNicholas Bellinger /******************************************************************************* 2c66ac9dbSNicholas Bellinger * Filename: target_core_file.c 3c66ac9dbSNicholas Bellinger * 4c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> FILEIO transport specific functions 5c66ac9dbSNicholas Bellinger * 6c66ac9dbSNicholas Bellinger * Copyright (c) 2005 PyX Technologies, Inc. 7c66ac9dbSNicholas Bellinger * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved. 8c66ac9dbSNicholas Bellinger * Copyright (c) 2007-2010 Rising Tide Systems 9c66ac9dbSNicholas Bellinger * Copyright (c) 2008-2010 Linux-iSCSI.org 10c66ac9dbSNicholas Bellinger * 11c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 12c66ac9dbSNicholas Bellinger * 13c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 14c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 15c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 16c66ac9dbSNicholas Bellinger * (at your option) any later version. 17c66ac9dbSNicholas Bellinger * 18c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 19c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 20c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 22c66ac9dbSNicholas Bellinger * 23c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 24c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 25c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 26c66ac9dbSNicholas Bellinger * 27c66ac9dbSNicholas Bellinger ******************************************************************************/ 28c66ac9dbSNicholas Bellinger 29c66ac9dbSNicholas Bellinger #include <linux/string.h> 30c66ac9dbSNicholas Bellinger #include <linux/parser.h> 31c66ac9dbSNicholas Bellinger #include <linux/timer.h> 32c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 33c66ac9dbSNicholas Bellinger #include <linux/slab.h> 34c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 35827509e3SPaul Gortmaker #include <linux/module.h> 36c66ac9dbSNicholas Bellinger #include <scsi/scsi.h> 37c66ac9dbSNicholas Bellinger #include <scsi/scsi_host.h> 38c66ac9dbSNicholas Bellinger 39c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 40c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 41c66ac9dbSNicholas Bellinger 42c66ac9dbSNicholas Bellinger #include "target_core_file.h" 43c66ac9dbSNicholas Bellinger 44c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template; 45c66ac9dbSNicholas Bellinger 46c66ac9dbSNicholas Bellinger /* fd_attach_hba(): (Part of se_subsystem_api_t template) 47c66ac9dbSNicholas Bellinger * 48c66ac9dbSNicholas Bellinger * 49c66ac9dbSNicholas Bellinger */ 50c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 51c66ac9dbSNicholas Bellinger { 52c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 53c66ac9dbSNicholas Bellinger 54c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 556708bb27SAndy Grover if (!fd_host) { 566708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 57e3d6f909SAndy Grover return -ENOMEM; 58c66ac9dbSNicholas Bellinger } 59c66ac9dbSNicholas Bellinger 60c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 61c66ac9dbSNicholas Bellinger 62e3d6f909SAndy Grover hba->hba_ptr = fd_host; 63c66ac9dbSNicholas Bellinger 646708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 65c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 66c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 676708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 68e3d6f909SAndy Grover " MaxSectors: %u\n", 69e3d6f909SAndy Grover hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); 70c66ac9dbSNicholas Bellinger 71c66ac9dbSNicholas Bellinger return 0; 72c66ac9dbSNicholas Bellinger } 73c66ac9dbSNicholas Bellinger 74c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 75c66ac9dbSNicholas Bellinger { 76c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 77c66ac9dbSNicholas Bellinger 786708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 79c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 80c66ac9dbSNicholas Bellinger 81c66ac9dbSNicholas Bellinger kfree(fd_host); 82c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 83c66ac9dbSNicholas Bellinger } 84c66ac9dbSNicholas Bellinger 85c66ac9dbSNicholas Bellinger static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) 86c66ac9dbSNicholas Bellinger { 87c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 888359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 89c66ac9dbSNicholas Bellinger 90c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 916708bb27SAndy Grover if (!fd_dev) { 926708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 93c66ac9dbSNicholas Bellinger return NULL; 94c66ac9dbSNicholas Bellinger } 95c66ac9dbSNicholas Bellinger 96c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 97c66ac9dbSNicholas Bellinger 986708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 99c66ac9dbSNicholas Bellinger 100c66ac9dbSNicholas Bellinger return fd_dev; 101c66ac9dbSNicholas Bellinger } 102c66ac9dbSNicholas Bellinger 103c66ac9dbSNicholas Bellinger /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) 104c66ac9dbSNicholas Bellinger * 105c66ac9dbSNicholas Bellinger * 106c66ac9dbSNicholas Bellinger */ 107c66ac9dbSNicholas Bellinger static struct se_device *fd_create_virtdevice( 108c66ac9dbSNicholas Bellinger struct se_hba *hba, 109c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 110c66ac9dbSNicholas Bellinger void *p) 111c66ac9dbSNicholas Bellinger { 112c66ac9dbSNicholas Bellinger struct se_device *dev; 113c66ac9dbSNicholas Bellinger struct se_dev_limits dev_limits; 114c66ac9dbSNicholas Bellinger struct queue_limits *limits; 1158359cf43SJörn Engel struct fd_dev *fd_dev = p; 1168359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 117c66ac9dbSNicholas Bellinger struct file *file; 118c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 119613640e4SNicholas Bellinger int dev_flags = 0, flags, ret = -EINVAL; 120c66ac9dbSNicholas Bellinger 121c66ac9dbSNicholas Bellinger memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 122c66ac9dbSNicholas Bellinger 123c66ac9dbSNicholas Bellinger /* 124a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 125a4dff304SNicholas Bellinger * of pure timestamp updates. 126c66ac9dbSNicholas Bellinger */ 127a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 128c66ac9dbSNicholas Bellinger 129dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 130613640e4SNicholas Bellinger if (IS_ERR(file)) { 131dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 132613640e4SNicholas Bellinger ret = PTR_ERR(file); 133613640e4SNicholas Bellinger goto fail; 134613640e4SNicholas Bellinger } 135c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 136c66ac9dbSNicholas Bellinger /* 137c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 138c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 139c66ac9dbSNicholas Bellinger * 140c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 141c66ac9dbSNicholas Bellinger */ 142c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 143c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 144c66ac9dbSNicholas Bellinger struct request_queue *q; 145cd9323fdSNicholas Bellinger unsigned long long dev_size; 146c66ac9dbSNicholas Bellinger /* 147c66ac9dbSNicholas Bellinger * Setup the local scope queue_limits from struct request_queue->limits 148c66ac9dbSNicholas Bellinger * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 149c66ac9dbSNicholas Bellinger */ 150c66ac9dbSNicholas Bellinger q = bdev_get_queue(inode->i_bdev); 151c66ac9dbSNicholas Bellinger limits = &dev_limits.limits; 152c66ac9dbSNicholas Bellinger limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); 153c66ac9dbSNicholas Bellinger limits->max_hw_sectors = queue_max_hw_sectors(q); 154c66ac9dbSNicholas Bellinger limits->max_sectors = queue_max_sectors(q); 155c66ac9dbSNicholas Bellinger /* 156c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 157c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 158c66ac9dbSNicholas Bellinger */ 159c66ac9dbSNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 160cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 161c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 162c66ac9dbSNicholas Bellinger 1636708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 164c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 165cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 166c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 167c66ac9dbSNicholas Bellinger } else { 168c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1696708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 170c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 171c66ac9dbSNicholas Bellinger " block_device\n"); 172c66ac9dbSNicholas Bellinger goto fail; 173c66ac9dbSNicholas Bellinger } 174c66ac9dbSNicholas Bellinger 175c66ac9dbSNicholas Bellinger limits = &dev_limits.limits; 176c66ac9dbSNicholas Bellinger limits->logical_block_size = FD_BLOCKSIZE; 177c66ac9dbSNicholas Bellinger limits->max_hw_sectors = FD_MAX_SECTORS; 178c66ac9dbSNicholas Bellinger limits->max_sectors = FD_MAX_SECTORS; 179c66ac9dbSNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 180c66ac9dbSNicholas Bellinger } 181c66ac9dbSNicholas Bellinger 182c66ac9dbSNicholas Bellinger dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 183c66ac9dbSNicholas Bellinger dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; 184c66ac9dbSNicholas Bellinger 185c66ac9dbSNicholas Bellinger dev = transport_add_device_to_core_hba(hba, &fileio_template, 1865951146dSAndy Grover se_dev, dev_flags, fd_dev, 187c66ac9dbSNicholas Bellinger &dev_limits, "FILEIO", FD_VERSION); 1886708bb27SAndy Grover if (!dev) 189c66ac9dbSNicholas Bellinger goto fail; 190c66ac9dbSNicholas Bellinger 191c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 192c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 193c66ac9dbSNicholas Bellinger 1946708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 195c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 196c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 197c66ac9dbSNicholas Bellinger 198c66ac9dbSNicholas Bellinger return dev; 199c66ac9dbSNicholas Bellinger fail: 200c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 201c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 202c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 203c66ac9dbSNicholas Bellinger } 204613640e4SNicholas Bellinger return ERR_PTR(ret); 205c66ac9dbSNicholas Bellinger } 206c66ac9dbSNicholas Bellinger 207c66ac9dbSNicholas Bellinger /* fd_free_device(): (Part of se_subsystem_api_t template) 208c66ac9dbSNicholas Bellinger * 209c66ac9dbSNicholas Bellinger * 210c66ac9dbSNicholas Bellinger */ 211c66ac9dbSNicholas Bellinger static void fd_free_device(void *p) 212c66ac9dbSNicholas Bellinger { 2138359cf43SJörn Engel struct fd_dev *fd_dev = p; 214c66ac9dbSNicholas Bellinger 215c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 216c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 217c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 218c66ac9dbSNicholas Bellinger } 219c66ac9dbSNicholas Bellinger 220c66ac9dbSNicholas Bellinger kfree(fd_dev); 221c66ac9dbSNicholas Bellinger } 222c66ac9dbSNicholas Bellinger 2235787cacdSChristoph Hellwig static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, 2245787cacdSChristoph Hellwig u32 sgl_nents) 225c66ac9dbSNicholas Bellinger { 2265787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 22742bf829eSChristoph Hellwig struct fd_dev *dev = se_dev->dev_ptr; 2286708bb27SAndy Grover struct file *fd = dev->fd_file; 2295787cacdSChristoph Hellwig struct scatterlist *sg; 230c66ac9dbSNicholas Bellinger struct iovec *iov; 231c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2325787cacdSChristoph Hellwig loff_t pos = (cmd->t_task_lba * 23342bf829eSChristoph Hellwig se_dev->se_sub_dev->se_dev_attrib.block_size); 234c66ac9dbSNicholas Bellinger int ret = 0, i; 235c66ac9dbSNicholas Bellinger 2365787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2376708bb27SAndy Grover if (!iov) { 2386708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 239e3d6f909SAndy Grover return -ENOMEM; 240c66ac9dbSNicholas Bellinger } 241c66ac9dbSNicholas Bellinger 2425787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2439649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 2449649fa1bSSebastian Andrzej Siewior iov[i].iov_base = sg_virt(sg); 245c66ac9dbSNicholas Bellinger } 246c66ac9dbSNicholas Bellinger 247c66ac9dbSNicholas Bellinger old_fs = get_fs(); 248c66ac9dbSNicholas Bellinger set_fs(get_ds()); 2495787cacdSChristoph Hellwig ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 250c66ac9dbSNicholas Bellinger set_fs(old_fs); 251c66ac9dbSNicholas Bellinger 252c66ac9dbSNicholas Bellinger kfree(iov); 253c66ac9dbSNicholas Bellinger /* 254c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 255c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 256c66ac9dbSNicholas Bellinger * block_device. 257c66ac9dbSNicholas Bellinger */ 258c66ac9dbSNicholas Bellinger if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { 2595787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 2606708bb27SAndy Grover pr_err("vfs_readv() returned %d," 261c66ac9dbSNicholas Bellinger " expecting %d for S_ISBLK\n", ret, 2625787cacdSChristoph Hellwig (int)cmd->data_length); 263e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 264c66ac9dbSNicholas Bellinger } 265c66ac9dbSNicholas Bellinger } else { 266c66ac9dbSNicholas Bellinger if (ret < 0) { 2676708bb27SAndy Grover pr_err("vfs_readv() returned %d for non" 268c66ac9dbSNicholas Bellinger " S_ISBLK\n", ret); 269e3d6f909SAndy Grover return ret; 270c66ac9dbSNicholas Bellinger } 271c66ac9dbSNicholas Bellinger } 272c66ac9dbSNicholas Bellinger 273c66ac9dbSNicholas Bellinger return 1; 274c66ac9dbSNicholas Bellinger } 275c66ac9dbSNicholas Bellinger 2765787cacdSChristoph Hellwig static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, 2775787cacdSChristoph Hellwig u32 sgl_nents) 278c66ac9dbSNicholas Bellinger { 2795787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 28042bf829eSChristoph Hellwig struct fd_dev *dev = se_dev->dev_ptr; 2816708bb27SAndy Grover struct file *fd = dev->fd_file; 2825787cacdSChristoph Hellwig struct scatterlist *sg; 283c66ac9dbSNicholas Bellinger struct iovec *iov; 284c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2855787cacdSChristoph Hellwig loff_t pos = (cmd->t_task_lba * 28642bf829eSChristoph Hellwig se_dev->se_sub_dev->se_dev_attrib.block_size); 287c66ac9dbSNicholas Bellinger int ret, i = 0; 288c66ac9dbSNicholas Bellinger 2895787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2906708bb27SAndy Grover if (!iov) { 2916708bb27SAndy Grover pr_err("Unable to allocate fd_do_writev iov[]\n"); 292e3d6f909SAndy Grover return -ENOMEM; 293c66ac9dbSNicholas Bellinger } 294c66ac9dbSNicholas Bellinger 2955787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2969649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 2979649fa1bSSebastian Andrzej Siewior iov[i].iov_base = sg_virt(sg); 298c66ac9dbSNicholas Bellinger } 299c66ac9dbSNicholas Bellinger 300c66ac9dbSNicholas Bellinger old_fs = get_fs(); 301c66ac9dbSNicholas Bellinger set_fs(get_ds()); 3025787cacdSChristoph Hellwig ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 303c66ac9dbSNicholas Bellinger set_fs(old_fs); 304c66ac9dbSNicholas Bellinger 305c66ac9dbSNicholas Bellinger kfree(iov); 306c66ac9dbSNicholas Bellinger 3075787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 3086708bb27SAndy Grover pr_err("vfs_writev() returned %d\n", ret); 309e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 310c66ac9dbSNicholas Bellinger } 311c66ac9dbSNicholas Bellinger 312c66ac9dbSNicholas Bellinger return 1; 313c66ac9dbSNicholas Bellinger } 314c66ac9dbSNicholas Bellinger 3156bb35e00SChristoph Hellwig static void fd_emulate_sync_cache(struct se_cmd *cmd) 316c66ac9dbSNicholas Bellinger { 317c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 318c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 319a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 320c66ac9dbSNicholas Bellinger loff_t start, end; 321c66ac9dbSNicholas Bellinger int ret; 322c66ac9dbSNicholas Bellinger 323c66ac9dbSNicholas Bellinger /* 324c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 325c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 326c66ac9dbSNicholas Bellinger */ 327c66ac9dbSNicholas Bellinger if (immed) 3285787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 329c66ac9dbSNicholas Bellinger 330c66ac9dbSNicholas Bellinger /* 331c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 332c66ac9dbSNicholas Bellinger */ 333a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 334c66ac9dbSNicholas Bellinger start = 0; 335c66ac9dbSNicholas Bellinger end = LLONG_MAX; 336c66ac9dbSNicholas Bellinger } else { 337a1d8b49aSAndy Grover start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; 338c66ac9dbSNicholas Bellinger if (cmd->data_length) 339c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 340c66ac9dbSNicholas Bellinger else 341c66ac9dbSNicholas Bellinger end = LLONG_MAX; 342c66ac9dbSNicholas Bellinger } 343c66ac9dbSNicholas Bellinger 344c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 345c66ac9dbSNicholas Bellinger if (ret != 0) 3466708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 347c66ac9dbSNicholas Bellinger 3485787cacdSChristoph Hellwig if (immed) 3495787cacdSChristoph Hellwig return; 3505787cacdSChristoph Hellwig 3515787cacdSChristoph Hellwig if (ret) { 3525787cacdSChristoph Hellwig cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3535787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 3545787cacdSChristoph Hellwig } else { 3555787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 3565787cacdSChristoph Hellwig } 357c66ac9dbSNicholas Bellinger } 358c66ac9dbSNicholas Bellinger 3595787cacdSChristoph Hellwig static int fd_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl, 3605787cacdSChristoph Hellwig u32 sgl_nents, enum dma_data_direction data_direction) 361c66ac9dbSNicholas Bellinger { 362c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 363c66ac9dbSNicholas Bellinger int ret = 0; 364c66ac9dbSNicholas Bellinger 365c66ac9dbSNicholas Bellinger /* 366c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 367c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 368c66ac9dbSNicholas Bellinger */ 3695787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 3705787cacdSChristoph Hellwig ret = fd_do_readv(cmd, sgl, sgl_nents); 371c66ac9dbSNicholas Bellinger } else { 3725787cacdSChristoph Hellwig ret = fd_do_writev(cmd, sgl, sgl_nents); 373a4dff304SNicholas Bellinger /* 374a4dff304SNicholas Bellinger * Perform implict vfs_fsync_range() for fd_do_writev() ops 375a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 376a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 377a4dff304SNicholas Bellinger */ 378c66ac9dbSNicholas Bellinger if (ret > 0 && 379e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && 3802d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 381a4dff304SNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 382a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 383a4dff304SNicholas Bellinger dev->se_sub_dev->se_dev_attrib.block_size; 384a4dff304SNicholas Bellinger loff_t end = start + cmd->data_length; 385c66ac9dbSNicholas Bellinger 386a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 387a4dff304SNicholas Bellinger } 388c66ac9dbSNicholas Bellinger } 389c66ac9dbSNicholas Bellinger 39003e98c9eSNicholas Bellinger if (ret < 0) { 39103e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 392c66ac9dbSNicholas Bellinger return ret; 39303e98c9eSNicholas Bellinger } 3945787cacdSChristoph Hellwig if (ret) 3955787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 39603e98c9eSNicholas Bellinger return 0; 397c66ac9dbSNicholas Bellinger } 398c66ac9dbSNicholas Bellinger 399c66ac9dbSNicholas Bellinger enum { 400c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 401c66ac9dbSNicholas Bellinger }; 402c66ac9dbSNicholas Bellinger 403c66ac9dbSNicholas Bellinger static match_table_t tokens = { 404c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 405c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 406c66ac9dbSNicholas Bellinger {Opt_err, NULL} 407c66ac9dbSNicholas Bellinger }; 408c66ac9dbSNicholas Bellinger 409c66ac9dbSNicholas Bellinger static ssize_t fd_set_configfs_dev_params( 410c66ac9dbSNicholas Bellinger struct se_hba *hba, 411c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 412c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 413c66ac9dbSNicholas Bellinger { 414c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 415c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 416c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 417a4dff304SNicholas Bellinger int ret = 0, token; 418c66ac9dbSNicholas Bellinger 419c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 420c66ac9dbSNicholas Bellinger if (!opts) 421c66ac9dbSNicholas Bellinger return -ENOMEM; 422c66ac9dbSNicholas Bellinger 423c66ac9dbSNicholas Bellinger orig = opts; 424c66ac9dbSNicholas Bellinger 42590c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 426c66ac9dbSNicholas Bellinger if (!*ptr) 427c66ac9dbSNicholas Bellinger continue; 428c66ac9dbSNicholas Bellinger 429c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 430c66ac9dbSNicholas Bellinger switch (token) { 431c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 432dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 433dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 434dbc6e022SAl Viro ret = -EINVAL; 4356d180253SJesper Juhl break; 4366d180253SJesper Juhl } 4376708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 438c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 439c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 440c66ac9dbSNicholas Bellinger break; 441c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 442c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 4436d180253SJesper Juhl if (!arg_p) { 4446d180253SJesper Juhl ret = -ENOMEM; 4456d180253SJesper Juhl break; 4466d180253SJesper Juhl } 447c66ac9dbSNicholas Bellinger ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); 4486d180253SJesper Juhl kfree(arg_p); 449c66ac9dbSNicholas Bellinger if (ret < 0) { 4506708bb27SAndy Grover pr_err("strict_strtoull() failed for" 451c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 452c66ac9dbSNicholas Bellinger goto out; 453c66ac9dbSNicholas Bellinger } 4546708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 455c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 456c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 457c66ac9dbSNicholas Bellinger break; 458c66ac9dbSNicholas Bellinger default: 459c66ac9dbSNicholas Bellinger break; 460c66ac9dbSNicholas Bellinger } 461c66ac9dbSNicholas Bellinger } 462c66ac9dbSNicholas Bellinger 463c66ac9dbSNicholas Bellinger out: 464c66ac9dbSNicholas Bellinger kfree(orig); 465c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 466c66ac9dbSNicholas Bellinger } 467c66ac9dbSNicholas Bellinger 468c66ac9dbSNicholas Bellinger static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) 469c66ac9dbSNicholas Bellinger { 4708359cf43SJörn Engel struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 471c66ac9dbSNicholas Bellinger 472c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 4736708bb27SAndy Grover pr_err("Missing fd_dev_name=\n"); 474e3d6f909SAndy Grover return -EINVAL; 475c66ac9dbSNicholas Bellinger } 476c66ac9dbSNicholas Bellinger 477c66ac9dbSNicholas Bellinger return 0; 478c66ac9dbSNicholas Bellinger } 479c66ac9dbSNicholas Bellinger 480c66ac9dbSNicholas Bellinger static ssize_t fd_show_configfs_dev_params( 481c66ac9dbSNicholas Bellinger struct se_hba *hba, 482c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 483c66ac9dbSNicholas Bellinger char *b) 484c66ac9dbSNicholas Bellinger { 485c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 486c66ac9dbSNicholas Bellinger ssize_t bl = 0; 487c66ac9dbSNicholas Bellinger 488c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 489a4dff304SNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: O_DSYNC\n", 490a4dff304SNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 491c66ac9dbSNicholas Bellinger return bl; 492c66ac9dbSNicholas Bellinger } 493c66ac9dbSNicholas Bellinger 494c66ac9dbSNicholas Bellinger /* fd_get_device_rev(): (Part of se_subsystem_api_t template) 495c66ac9dbSNicholas Bellinger * 496c66ac9dbSNicholas Bellinger * 497c66ac9dbSNicholas Bellinger */ 498c66ac9dbSNicholas Bellinger static u32 fd_get_device_rev(struct se_device *dev) 499c66ac9dbSNicholas Bellinger { 500c66ac9dbSNicholas Bellinger return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ 501c66ac9dbSNicholas Bellinger } 502c66ac9dbSNicholas Bellinger 503c66ac9dbSNicholas Bellinger /* fd_get_device_type(): (Part of se_subsystem_api_t template) 504c66ac9dbSNicholas Bellinger * 505c66ac9dbSNicholas Bellinger * 506c66ac9dbSNicholas Bellinger */ 507c66ac9dbSNicholas Bellinger static u32 fd_get_device_type(struct se_device *dev) 508c66ac9dbSNicholas Bellinger { 509c66ac9dbSNicholas Bellinger return TYPE_DISK; 510c66ac9dbSNicholas Bellinger } 511c66ac9dbSNicholas Bellinger 512c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 513c66ac9dbSNicholas Bellinger { 514c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 515cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 516cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 517cd9323fdSNicholas Bellinger unsigned long long dev_size; 518cd9323fdSNicholas Bellinger /* 519cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 520cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 521cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 522cd9323fdSNicholas Bellinger */ 523cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 524cd9323fdSNicholas Bellinger dev_size = (i_size_read(i) - fd_dev->fd_block_size); 525cd9323fdSNicholas Bellinger else 526cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 527c66ac9dbSNicholas Bellinger 528cd9323fdSNicholas Bellinger return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size); 529c66ac9dbSNicholas Bellinger } 530c66ac9dbSNicholas Bellinger 531c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 532c66ac9dbSNicholas Bellinger .name = "fileio", 533c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 534c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 535f55918faSChristoph Hellwig .write_cache_emulated = 1, 536f55918faSChristoph Hellwig .fua_write_emulated = 1, 537c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 538c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 539c66ac9dbSNicholas Bellinger .allocate_virtdevice = fd_allocate_virtdevice, 540c66ac9dbSNicholas Bellinger .create_virtdevice = fd_create_virtdevice, 541c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 5425787cacdSChristoph Hellwig .execute_cmd = fd_execute_cmd, 543c66ac9dbSNicholas Bellinger .do_sync_cache = fd_emulate_sync_cache, 544c66ac9dbSNicholas Bellinger .check_configfs_dev_params = fd_check_configfs_dev_params, 545c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 546c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 547c66ac9dbSNicholas Bellinger .get_device_rev = fd_get_device_rev, 548c66ac9dbSNicholas Bellinger .get_device_type = fd_get_device_type, 549c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 550c66ac9dbSNicholas Bellinger }; 551c66ac9dbSNicholas Bellinger 552c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 553c66ac9dbSNicholas Bellinger { 554c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 555c66ac9dbSNicholas Bellinger } 556c66ac9dbSNicholas Bellinger 557c66ac9dbSNicholas Bellinger static void fileio_module_exit(void) 558c66ac9dbSNicholas Bellinger { 559c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 560c66ac9dbSNicholas Bellinger } 561c66ac9dbSNicholas Bellinger 562c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 563c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 564c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 565c66ac9dbSNicholas Bellinger 566c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 567c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 568