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> 40c66ac9dbSNicholas Bellinger #include <target/target_core_device.h> 41c66ac9dbSNicholas Bellinger #include <target/target_core_transport.h> 42c66ac9dbSNicholas Bellinger 43c66ac9dbSNicholas Bellinger #include "target_core_file.h" 44c66ac9dbSNicholas Bellinger 45c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template; 46c66ac9dbSNicholas Bellinger 47c66ac9dbSNicholas Bellinger /* fd_attach_hba(): (Part of se_subsystem_api_t template) 48c66ac9dbSNicholas Bellinger * 49c66ac9dbSNicholas Bellinger * 50c66ac9dbSNicholas Bellinger */ 51c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 52c66ac9dbSNicholas Bellinger { 53c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 54c66ac9dbSNicholas Bellinger 55c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 566708bb27SAndy Grover if (!fd_host) { 576708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 58e3d6f909SAndy Grover return -ENOMEM; 59c66ac9dbSNicholas Bellinger } 60c66ac9dbSNicholas Bellinger 61c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 62c66ac9dbSNicholas Bellinger 63e3d6f909SAndy Grover hba->hba_ptr = fd_host; 64c66ac9dbSNicholas Bellinger 656708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 66c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 67c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 686708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 69e3d6f909SAndy Grover " MaxSectors: %u\n", 70e3d6f909SAndy Grover hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); 71c66ac9dbSNicholas Bellinger 72c66ac9dbSNicholas Bellinger return 0; 73c66ac9dbSNicholas Bellinger } 74c66ac9dbSNicholas Bellinger 75c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 76c66ac9dbSNicholas Bellinger { 77c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 78c66ac9dbSNicholas Bellinger 796708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 80c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 81c66ac9dbSNicholas Bellinger 82c66ac9dbSNicholas Bellinger kfree(fd_host); 83c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 84c66ac9dbSNicholas Bellinger } 85c66ac9dbSNicholas Bellinger 86c66ac9dbSNicholas Bellinger static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) 87c66ac9dbSNicholas Bellinger { 88c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 89c66ac9dbSNicholas Bellinger struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; 90c66ac9dbSNicholas Bellinger 91c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 926708bb27SAndy Grover if (!fd_dev) { 936708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 94c66ac9dbSNicholas Bellinger return NULL; 95c66ac9dbSNicholas Bellinger } 96c66ac9dbSNicholas Bellinger 97c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 98c66ac9dbSNicholas Bellinger 996708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 100c66ac9dbSNicholas Bellinger 101c66ac9dbSNicholas Bellinger return fd_dev; 102c66ac9dbSNicholas Bellinger } 103c66ac9dbSNicholas Bellinger 104c66ac9dbSNicholas Bellinger /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) 105c66ac9dbSNicholas Bellinger * 106c66ac9dbSNicholas Bellinger * 107c66ac9dbSNicholas Bellinger */ 108c66ac9dbSNicholas Bellinger static struct se_device *fd_create_virtdevice( 109c66ac9dbSNicholas Bellinger struct se_hba *hba, 110c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 111c66ac9dbSNicholas Bellinger void *p) 112c66ac9dbSNicholas Bellinger { 113c66ac9dbSNicholas Bellinger char *dev_p = NULL; 114c66ac9dbSNicholas Bellinger struct se_device *dev; 115c66ac9dbSNicholas Bellinger struct se_dev_limits dev_limits; 116c66ac9dbSNicholas Bellinger struct queue_limits *limits; 117c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = (struct fd_dev *) p; 118c66ac9dbSNicholas Bellinger struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; 119c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 120c66ac9dbSNicholas Bellinger struct file *file; 121c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 122613640e4SNicholas Bellinger int dev_flags = 0, flags, ret = -EINVAL; 123c66ac9dbSNicholas Bellinger 124c66ac9dbSNicholas Bellinger memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 125c66ac9dbSNicholas Bellinger 126c66ac9dbSNicholas Bellinger old_fs = get_fs(); 127c66ac9dbSNicholas Bellinger set_fs(get_ds()); 128c66ac9dbSNicholas Bellinger dev_p = getname(fd_dev->fd_dev_name); 129c66ac9dbSNicholas Bellinger set_fs(old_fs); 130c66ac9dbSNicholas Bellinger 131c66ac9dbSNicholas Bellinger if (IS_ERR(dev_p)) { 1326708bb27SAndy Grover pr_err("getname(%s) failed: %lu\n", 133c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, IS_ERR(dev_p)); 134613640e4SNicholas Bellinger ret = PTR_ERR(dev_p); 135c66ac9dbSNicholas Bellinger goto fail; 136c66ac9dbSNicholas Bellinger } 137c66ac9dbSNicholas Bellinger #if 0 138c66ac9dbSNicholas Bellinger if (di->no_create_file) 139c66ac9dbSNicholas Bellinger flags = O_RDWR | O_LARGEFILE; 140c66ac9dbSNicholas Bellinger else 141c66ac9dbSNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE; 142c66ac9dbSNicholas Bellinger #else 143c66ac9dbSNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE; 144c66ac9dbSNicholas Bellinger #endif 145c66ac9dbSNicholas Bellinger /* flags |= O_DIRECT; */ 146c66ac9dbSNicholas Bellinger /* 14725985edcSLucas De Marchi * If fd_buffered_io=1 has not been set explicitly (the default), 148c66ac9dbSNicholas Bellinger * use O_SYNC to force FILEIO writes to disk. 149c66ac9dbSNicholas Bellinger */ 150c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) 151c66ac9dbSNicholas Bellinger flags |= O_SYNC; 152c66ac9dbSNicholas Bellinger 153c66ac9dbSNicholas Bellinger file = filp_open(dev_p, flags, 0600); 154613640e4SNicholas Bellinger if (IS_ERR(file)) { 1556708bb27SAndy Grover pr_err("filp_open(%s) failed\n", dev_p); 156613640e4SNicholas Bellinger ret = PTR_ERR(file); 157613640e4SNicholas Bellinger goto fail; 158613640e4SNicholas Bellinger } 159613640e4SNicholas Bellinger if (!file || !file->f_dentry) { 1606708bb27SAndy Grover pr_err("filp_open(%s) failed\n", dev_p); 161c66ac9dbSNicholas Bellinger goto fail; 162c66ac9dbSNicholas Bellinger } 163c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 164c66ac9dbSNicholas Bellinger /* 165c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 166c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 167c66ac9dbSNicholas Bellinger * 168c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 169c66ac9dbSNicholas Bellinger */ 170c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 171c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 172c66ac9dbSNicholas Bellinger struct request_queue *q; 173c66ac9dbSNicholas Bellinger /* 174c66ac9dbSNicholas Bellinger * Setup the local scope queue_limits from struct request_queue->limits 175c66ac9dbSNicholas Bellinger * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 176c66ac9dbSNicholas Bellinger */ 177c66ac9dbSNicholas Bellinger q = bdev_get_queue(inode->i_bdev); 178c66ac9dbSNicholas Bellinger limits = &dev_limits.limits; 179c66ac9dbSNicholas Bellinger limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); 180c66ac9dbSNicholas Bellinger limits->max_hw_sectors = queue_max_hw_sectors(q); 181c66ac9dbSNicholas Bellinger limits->max_sectors = queue_max_sectors(q); 182c66ac9dbSNicholas Bellinger /* 183c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 184c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 185c66ac9dbSNicholas Bellinger */ 186c66ac9dbSNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 187c66ac9dbSNicholas Bellinger fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - 188c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 189c66ac9dbSNicholas Bellinger 1906708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 191c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 192c66ac9dbSNicholas Bellinger fd_dev->fd_dev_size, 193c66ac9dbSNicholas Bellinger div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), 194c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 195c66ac9dbSNicholas Bellinger } else { 196c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1976708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 198c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 199c66ac9dbSNicholas Bellinger " block_device\n"); 200c66ac9dbSNicholas Bellinger goto fail; 201c66ac9dbSNicholas Bellinger } 202c66ac9dbSNicholas Bellinger 203c66ac9dbSNicholas Bellinger limits = &dev_limits.limits; 204c66ac9dbSNicholas Bellinger limits->logical_block_size = FD_BLOCKSIZE; 205c66ac9dbSNicholas Bellinger limits->max_hw_sectors = FD_MAX_SECTORS; 206c66ac9dbSNicholas Bellinger limits->max_sectors = FD_MAX_SECTORS; 207c66ac9dbSNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 208c66ac9dbSNicholas Bellinger } 209c66ac9dbSNicholas Bellinger 210c66ac9dbSNicholas Bellinger dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 211c66ac9dbSNicholas Bellinger dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; 212c66ac9dbSNicholas Bellinger 213c66ac9dbSNicholas Bellinger dev = transport_add_device_to_core_hba(hba, &fileio_template, 2145951146dSAndy Grover se_dev, dev_flags, fd_dev, 215c66ac9dbSNicholas Bellinger &dev_limits, "FILEIO", FD_VERSION); 2166708bb27SAndy Grover if (!dev) 217c66ac9dbSNicholas Bellinger goto fail; 218c66ac9dbSNicholas Bellinger 219c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 220c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 221c66ac9dbSNicholas Bellinger 2226708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 223c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 224c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 225c66ac9dbSNicholas Bellinger 226c66ac9dbSNicholas Bellinger putname(dev_p); 227c66ac9dbSNicholas Bellinger return dev; 228c66ac9dbSNicholas Bellinger fail: 229c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 230c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 231c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 232c66ac9dbSNicholas Bellinger } 233c66ac9dbSNicholas Bellinger putname(dev_p); 234613640e4SNicholas Bellinger return ERR_PTR(ret); 235c66ac9dbSNicholas Bellinger } 236c66ac9dbSNicholas Bellinger 237c66ac9dbSNicholas Bellinger /* fd_free_device(): (Part of se_subsystem_api_t template) 238c66ac9dbSNicholas Bellinger * 239c66ac9dbSNicholas Bellinger * 240c66ac9dbSNicholas Bellinger */ 241c66ac9dbSNicholas Bellinger static void fd_free_device(void *p) 242c66ac9dbSNicholas Bellinger { 243c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = (struct fd_dev *) p; 244c66ac9dbSNicholas Bellinger 245c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 246c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 247c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 248c66ac9dbSNicholas Bellinger } 249c66ac9dbSNicholas Bellinger 250c66ac9dbSNicholas Bellinger kfree(fd_dev); 251c66ac9dbSNicholas Bellinger } 252c66ac9dbSNicholas Bellinger 253c66ac9dbSNicholas Bellinger static inline struct fd_request *FILE_REQ(struct se_task *task) 254c66ac9dbSNicholas Bellinger { 255c66ac9dbSNicholas Bellinger return container_of(task, struct fd_request, fd_task); 256c66ac9dbSNicholas Bellinger } 257c66ac9dbSNicholas Bellinger 258c66ac9dbSNicholas Bellinger 259c66ac9dbSNicholas Bellinger static struct se_task * 2606708bb27SAndy Grover fd_alloc_task(unsigned char *cdb) 261c66ac9dbSNicholas Bellinger { 262c66ac9dbSNicholas Bellinger struct fd_request *fd_req; 263c66ac9dbSNicholas Bellinger 264c66ac9dbSNicholas Bellinger fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); 2656708bb27SAndy Grover if (!fd_req) { 2666708bb27SAndy Grover pr_err("Unable to allocate struct fd_request\n"); 267c66ac9dbSNicholas Bellinger return NULL; 268c66ac9dbSNicholas Bellinger } 269c66ac9dbSNicholas Bellinger 270c66ac9dbSNicholas Bellinger return &fd_req->fd_task; 271c66ac9dbSNicholas Bellinger } 272c66ac9dbSNicholas Bellinger 273c66ac9dbSNicholas Bellinger static int fd_do_readv(struct se_task *task) 274c66ac9dbSNicholas Bellinger { 275c66ac9dbSNicholas Bellinger struct fd_request *req = FILE_REQ(task); 27642bf829eSChristoph Hellwig struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; 27742bf829eSChristoph Hellwig struct fd_dev *dev = se_dev->dev_ptr; 2786708bb27SAndy Grover struct file *fd = dev->fd_file; 279c66ac9dbSNicholas Bellinger struct scatterlist *sg = task->task_sg; 280c66ac9dbSNicholas Bellinger struct iovec *iov; 281c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 282e3d6f909SAndy Grover loff_t pos = (task->task_lba * 28342bf829eSChristoph Hellwig se_dev->se_sub_dev->se_dev_attrib.block_size); 284c66ac9dbSNicholas Bellinger int ret = 0, i; 285c66ac9dbSNicholas Bellinger 2866708bb27SAndy Grover iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); 2876708bb27SAndy Grover if (!iov) { 2886708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 289e3d6f909SAndy Grover return -ENOMEM; 290c66ac9dbSNicholas Bellinger } 291c66ac9dbSNicholas Bellinger 2926708bb27SAndy Grover for (i = 0; i < task->task_sg_nents; i++) { 293c66ac9dbSNicholas Bellinger iov[i].iov_len = sg[i].length; 294c66ac9dbSNicholas Bellinger iov[i].iov_base = sg_virt(&sg[i]); 295c66ac9dbSNicholas Bellinger } 296c66ac9dbSNicholas Bellinger 297c66ac9dbSNicholas Bellinger old_fs = get_fs(); 298c66ac9dbSNicholas Bellinger set_fs(get_ds()); 2996708bb27SAndy Grover ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos); 300c66ac9dbSNicholas Bellinger set_fs(old_fs); 301c66ac9dbSNicholas Bellinger 302c66ac9dbSNicholas Bellinger kfree(iov); 303c66ac9dbSNicholas Bellinger /* 304c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 305c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 306c66ac9dbSNicholas Bellinger * block_device. 307c66ac9dbSNicholas Bellinger */ 308c66ac9dbSNicholas Bellinger if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { 309c66ac9dbSNicholas Bellinger if (ret < 0 || ret != task->task_size) { 3106708bb27SAndy Grover pr_err("vfs_readv() returned %d," 311c66ac9dbSNicholas Bellinger " expecting %d for S_ISBLK\n", ret, 312c66ac9dbSNicholas Bellinger (int)task->task_size); 313e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 314c66ac9dbSNicholas Bellinger } 315c66ac9dbSNicholas Bellinger } else { 316c66ac9dbSNicholas Bellinger if (ret < 0) { 3176708bb27SAndy Grover pr_err("vfs_readv() returned %d for non" 318c66ac9dbSNicholas Bellinger " S_ISBLK\n", ret); 319e3d6f909SAndy Grover return ret; 320c66ac9dbSNicholas Bellinger } 321c66ac9dbSNicholas Bellinger } 322c66ac9dbSNicholas Bellinger 323c66ac9dbSNicholas Bellinger return 1; 324c66ac9dbSNicholas Bellinger } 325c66ac9dbSNicholas Bellinger 326c66ac9dbSNicholas Bellinger static int fd_do_writev(struct se_task *task) 327c66ac9dbSNicholas Bellinger { 328c66ac9dbSNicholas Bellinger struct fd_request *req = FILE_REQ(task); 32942bf829eSChristoph Hellwig struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; 33042bf829eSChristoph Hellwig struct fd_dev *dev = se_dev->dev_ptr; 3316708bb27SAndy Grover struct file *fd = dev->fd_file; 332c66ac9dbSNicholas Bellinger struct scatterlist *sg = task->task_sg; 333c66ac9dbSNicholas Bellinger struct iovec *iov; 334c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 335e3d6f909SAndy Grover loff_t pos = (task->task_lba * 33642bf829eSChristoph Hellwig se_dev->se_sub_dev->se_dev_attrib.block_size); 337c66ac9dbSNicholas Bellinger int ret, i = 0; 338c66ac9dbSNicholas Bellinger 3396708bb27SAndy Grover iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); 3406708bb27SAndy Grover if (!iov) { 3416708bb27SAndy Grover pr_err("Unable to allocate fd_do_writev iov[]\n"); 342e3d6f909SAndy Grover return -ENOMEM; 343c66ac9dbSNicholas Bellinger } 344c66ac9dbSNicholas Bellinger 3456708bb27SAndy Grover for (i = 0; i < task->task_sg_nents; i++) { 346c66ac9dbSNicholas Bellinger iov[i].iov_len = sg[i].length; 347c66ac9dbSNicholas Bellinger iov[i].iov_base = sg_virt(&sg[i]); 348c66ac9dbSNicholas Bellinger } 349c66ac9dbSNicholas Bellinger 350c66ac9dbSNicholas Bellinger old_fs = get_fs(); 351c66ac9dbSNicholas Bellinger set_fs(get_ds()); 3526708bb27SAndy Grover ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos); 353c66ac9dbSNicholas Bellinger set_fs(old_fs); 354c66ac9dbSNicholas Bellinger 355c66ac9dbSNicholas Bellinger kfree(iov); 356c66ac9dbSNicholas Bellinger 357c66ac9dbSNicholas Bellinger if (ret < 0 || ret != task->task_size) { 3586708bb27SAndy Grover pr_err("vfs_writev() returned %d\n", ret); 359e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 360c66ac9dbSNicholas Bellinger } 361c66ac9dbSNicholas Bellinger 362c66ac9dbSNicholas Bellinger return 1; 363c66ac9dbSNicholas Bellinger } 364c66ac9dbSNicholas Bellinger 365c66ac9dbSNicholas Bellinger static void fd_emulate_sync_cache(struct se_task *task) 366c66ac9dbSNicholas Bellinger { 367e3d6f909SAndy Grover struct se_cmd *cmd = task->task_se_cmd; 368c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 369c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 370a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 371c66ac9dbSNicholas Bellinger loff_t start, end; 372c66ac9dbSNicholas Bellinger int ret; 373c66ac9dbSNicholas Bellinger 374c66ac9dbSNicholas Bellinger /* 375c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 376c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 377c66ac9dbSNicholas Bellinger */ 378c66ac9dbSNicholas Bellinger if (immed) 379c66ac9dbSNicholas Bellinger transport_complete_sync_cache(cmd, 1); 380c66ac9dbSNicholas Bellinger 381c66ac9dbSNicholas Bellinger /* 382c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 383c66ac9dbSNicholas Bellinger */ 384a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 385c66ac9dbSNicholas Bellinger start = 0; 386c66ac9dbSNicholas Bellinger end = LLONG_MAX; 387c66ac9dbSNicholas Bellinger } else { 388a1d8b49aSAndy Grover start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; 389c66ac9dbSNicholas Bellinger if (cmd->data_length) 390c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 391c66ac9dbSNicholas Bellinger else 392c66ac9dbSNicholas Bellinger end = LLONG_MAX; 393c66ac9dbSNicholas Bellinger } 394c66ac9dbSNicholas Bellinger 395c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 396c66ac9dbSNicholas Bellinger if (ret != 0) 3976708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 398c66ac9dbSNicholas Bellinger 399c66ac9dbSNicholas Bellinger if (!immed) 400c66ac9dbSNicholas Bellinger transport_complete_sync_cache(cmd, ret == 0); 401c66ac9dbSNicholas Bellinger } 402c66ac9dbSNicholas Bellinger 403c66ac9dbSNicholas Bellinger /* 404c66ac9dbSNicholas Bellinger * WRITE Force Unit Access (FUA) emulation on a per struct se_task 405c66ac9dbSNicholas Bellinger * LBA range basis.. 406c66ac9dbSNicholas Bellinger */ 407c66ac9dbSNicholas Bellinger static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) 408c66ac9dbSNicholas Bellinger { 409c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 410c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 411e3d6f909SAndy Grover loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; 412c66ac9dbSNicholas Bellinger loff_t end = start + task->task_size; 413c66ac9dbSNicholas Bellinger int ret; 414c66ac9dbSNicholas Bellinger 4156708bb27SAndy Grover pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", 416c66ac9dbSNicholas Bellinger task->task_lba, task->task_size); 417c66ac9dbSNicholas Bellinger 418c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 419c66ac9dbSNicholas Bellinger if (ret != 0) 4206708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 421c66ac9dbSNicholas Bellinger } 422c66ac9dbSNicholas Bellinger 423c66ac9dbSNicholas Bellinger static int fd_do_task(struct se_task *task) 424c66ac9dbSNicholas Bellinger { 425c66ac9dbSNicholas Bellinger struct se_cmd *cmd = task->task_se_cmd; 426c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 427c66ac9dbSNicholas Bellinger int ret = 0; 428c66ac9dbSNicholas Bellinger 429c66ac9dbSNicholas Bellinger /* 430c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 431c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 432c66ac9dbSNicholas Bellinger */ 433c66ac9dbSNicholas Bellinger if (task->task_data_direction == DMA_FROM_DEVICE) { 434c66ac9dbSNicholas Bellinger ret = fd_do_readv(task); 435c66ac9dbSNicholas Bellinger } else { 436c66ac9dbSNicholas Bellinger ret = fd_do_writev(task); 437c66ac9dbSNicholas Bellinger 438c66ac9dbSNicholas Bellinger if (ret > 0 && 439e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && 440e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && 441a1d8b49aSAndy Grover cmd->t_tasks_fua) { 442c66ac9dbSNicholas Bellinger /* 443c66ac9dbSNicholas Bellinger * We might need to be a bit smarter here 444c66ac9dbSNicholas Bellinger * and return some sense data to let the initiator 445c66ac9dbSNicholas Bellinger * know the FUA WRITE cache sync failed..? 446c66ac9dbSNicholas Bellinger */ 447c66ac9dbSNicholas Bellinger fd_emulate_write_fua(cmd, task); 448c66ac9dbSNicholas Bellinger } 449c66ac9dbSNicholas Bellinger 450c66ac9dbSNicholas Bellinger } 451c66ac9dbSNicholas Bellinger 45203e98c9eSNicholas Bellinger if (ret < 0) { 45303e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 454c66ac9dbSNicholas Bellinger return ret; 45503e98c9eSNicholas Bellinger } 456c66ac9dbSNicholas Bellinger if (ret) { 457c66ac9dbSNicholas Bellinger task->task_scsi_status = GOOD; 458c66ac9dbSNicholas Bellinger transport_complete_task(task, 1); 459c66ac9dbSNicholas Bellinger } 46003e98c9eSNicholas Bellinger return 0; 461c66ac9dbSNicholas Bellinger } 462c66ac9dbSNicholas Bellinger 463c66ac9dbSNicholas Bellinger /* fd_free_task(): (Part of se_subsystem_api_t template) 464c66ac9dbSNicholas Bellinger * 465c66ac9dbSNicholas Bellinger * 466c66ac9dbSNicholas Bellinger */ 467c66ac9dbSNicholas Bellinger static void fd_free_task(struct se_task *task) 468c66ac9dbSNicholas Bellinger { 469c66ac9dbSNicholas Bellinger struct fd_request *req = FILE_REQ(task); 470c66ac9dbSNicholas Bellinger 471c66ac9dbSNicholas Bellinger kfree(req); 472c66ac9dbSNicholas Bellinger } 473c66ac9dbSNicholas Bellinger 474c66ac9dbSNicholas Bellinger enum { 475c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 476c66ac9dbSNicholas Bellinger }; 477c66ac9dbSNicholas Bellinger 478c66ac9dbSNicholas Bellinger static match_table_t tokens = { 479c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 480c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 48158c3e647SNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 482c66ac9dbSNicholas Bellinger {Opt_err, NULL} 483c66ac9dbSNicholas Bellinger }; 484c66ac9dbSNicholas Bellinger 485c66ac9dbSNicholas Bellinger static ssize_t fd_set_configfs_dev_params( 486c66ac9dbSNicholas Bellinger struct se_hba *hba, 487c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 488c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 489c66ac9dbSNicholas Bellinger { 490c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 491c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 492c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 493c66ac9dbSNicholas Bellinger int ret = 0, arg, token; 494c66ac9dbSNicholas Bellinger 495c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 496c66ac9dbSNicholas Bellinger if (!opts) 497c66ac9dbSNicholas Bellinger return -ENOMEM; 498c66ac9dbSNicholas Bellinger 499c66ac9dbSNicholas Bellinger orig = opts; 500c66ac9dbSNicholas Bellinger 501c66ac9dbSNicholas Bellinger while ((ptr = strsep(&opts, ",")) != NULL) { 502c66ac9dbSNicholas Bellinger if (!*ptr) 503c66ac9dbSNicholas Bellinger continue; 504c66ac9dbSNicholas Bellinger 505c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 506c66ac9dbSNicholas Bellinger switch (token) { 507c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 5086d180253SJesper Juhl arg_p = match_strdup(&args[0]); 5096d180253SJesper Juhl if (!arg_p) { 5106d180253SJesper Juhl ret = -ENOMEM; 5116d180253SJesper Juhl break; 5126d180253SJesper Juhl } 513c66ac9dbSNicholas Bellinger snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, 5146d180253SJesper Juhl "%s", arg_p); 5156d180253SJesper Juhl kfree(arg_p); 5166708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 517c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 518c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 519c66ac9dbSNicholas Bellinger break; 520c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 521c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 5226d180253SJesper Juhl if (!arg_p) { 5236d180253SJesper Juhl ret = -ENOMEM; 5246d180253SJesper Juhl break; 5256d180253SJesper Juhl } 526c66ac9dbSNicholas Bellinger ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); 5276d180253SJesper Juhl kfree(arg_p); 528c66ac9dbSNicholas Bellinger if (ret < 0) { 5296708bb27SAndy Grover pr_err("strict_strtoull() failed for" 530c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 531c66ac9dbSNicholas Bellinger goto out; 532c66ac9dbSNicholas Bellinger } 5336708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 534c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 535c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 536c66ac9dbSNicholas Bellinger break; 537c66ac9dbSNicholas Bellinger case Opt_fd_buffered_io: 538c66ac9dbSNicholas Bellinger match_int(args, &arg); 539c66ac9dbSNicholas Bellinger if (arg != 1) { 5406708bb27SAndy Grover pr_err("bogus fd_buffered_io=%d value\n", arg); 541c66ac9dbSNicholas Bellinger ret = -EINVAL; 542c66ac9dbSNicholas Bellinger goto out; 543c66ac9dbSNicholas Bellinger } 544c66ac9dbSNicholas Bellinger 5456708bb27SAndy Grover pr_debug("FILEIO: Using buffered I/O" 546c66ac9dbSNicholas Bellinger " operations for struct fd_dev\n"); 547c66ac9dbSNicholas Bellinger 548c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; 549c66ac9dbSNicholas Bellinger break; 550c66ac9dbSNicholas Bellinger default: 551c66ac9dbSNicholas Bellinger break; 552c66ac9dbSNicholas Bellinger } 553c66ac9dbSNicholas Bellinger } 554c66ac9dbSNicholas Bellinger 555c66ac9dbSNicholas Bellinger out: 556c66ac9dbSNicholas Bellinger kfree(orig); 557c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 558c66ac9dbSNicholas Bellinger } 559c66ac9dbSNicholas Bellinger 560c66ac9dbSNicholas Bellinger static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) 561c66ac9dbSNicholas Bellinger { 562c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; 563c66ac9dbSNicholas Bellinger 564c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 5656708bb27SAndy Grover pr_err("Missing fd_dev_name=\n"); 566e3d6f909SAndy Grover return -EINVAL; 567c66ac9dbSNicholas Bellinger } 568c66ac9dbSNicholas Bellinger 569c66ac9dbSNicholas Bellinger return 0; 570c66ac9dbSNicholas Bellinger } 571c66ac9dbSNicholas Bellinger 572c66ac9dbSNicholas Bellinger static ssize_t fd_show_configfs_dev_params( 573c66ac9dbSNicholas Bellinger struct se_hba *hba, 574c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 575c66ac9dbSNicholas Bellinger char *b) 576c66ac9dbSNicholas Bellinger { 577c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 578c66ac9dbSNicholas Bellinger ssize_t bl = 0; 579c66ac9dbSNicholas Bellinger 580c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 581c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 582c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 583c66ac9dbSNicholas Bellinger (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? 584c66ac9dbSNicholas Bellinger "Buffered" : "Synchronous"); 585c66ac9dbSNicholas Bellinger return bl; 586c66ac9dbSNicholas Bellinger } 587c66ac9dbSNicholas Bellinger 588c66ac9dbSNicholas Bellinger /* fd_get_device_rev(): (Part of se_subsystem_api_t template) 589c66ac9dbSNicholas Bellinger * 590c66ac9dbSNicholas Bellinger * 591c66ac9dbSNicholas Bellinger */ 592c66ac9dbSNicholas Bellinger static u32 fd_get_device_rev(struct se_device *dev) 593c66ac9dbSNicholas Bellinger { 594c66ac9dbSNicholas Bellinger return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ 595c66ac9dbSNicholas Bellinger } 596c66ac9dbSNicholas Bellinger 597c66ac9dbSNicholas Bellinger /* fd_get_device_type(): (Part of se_subsystem_api_t template) 598c66ac9dbSNicholas Bellinger * 599c66ac9dbSNicholas Bellinger * 600c66ac9dbSNicholas Bellinger */ 601c66ac9dbSNicholas Bellinger static u32 fd_get_device_type(struct se_device *dev) 602c66ac9dbSNicholas Bellinger { 603c66ac9dbSNicholas Bellinger return TYPE_DISK; 604c66ac9dbSNicholas Bellinger } 605c66ac9dbSNicholas Bellinger 606c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 607c66ac9dbSNicholas Bellinger { 608c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev = dev->dev_ptr; 609c66ac9dbSNicholas Bellinger unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, 610e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.block_size); 611c66ac9dbSNicholas Bellinger 612c66ac9dbSNicholas Bellinger return blocks_long; 613c66ac9dbSNicholas Bellinger } 614c66ac9dbSNicholas Bellinger 615c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 616c66ac9dbSNicholas Bellinger .name = "fileio", 617c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 618c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 619f55918faSChristoph Hellwig .write_cache_emulated = 1, 620f55918faSChristoph Hellwig .fua_write_emulated = 1, 621c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 622c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 623c66ac9dbSNicholas Bellinger .allocate_virtdevice = fd_allocate_virtdevice, 624c66ac9dbSNicholas Bellinger .create_virtdevice = fd_create_virtdevice, 625c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 626c66ac9dbSNicholas Bellinger .alloc_task = fd_alloc_task, 627c66ac9dbSNicholas Bellinger .do_task = fd_do_task, 628c66ac9dbSNicholas Bellinger .do_sync_cache = fd_emulate_sync_cache, 629c66ac9dbSNicholas Bellinger .free_task = fd_free_task, 630c66ac9dbSNicholas Bellinger .check_configfs_dev_params = fd_check_configfs_dev_params, 631c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 632c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 633c66ac9dbSNicholas Bellinger .get_device_rev = fd_get_device_rev, 634c66ac9dbSNicholas Bellinger .get_device_type = fd_get_device_type, 635c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 636c66ac9dbSNicholas Bellinger }; 637c66ac9dbSNicholas Bellinger 638c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 639c66ac9dbSNicholas Bellinger { 640c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 641c66ac9dbSNicholas Bellinger } 642c66ac9dbSNicholas Bellinger 643c66ac9dbSNicholas Bellinger static void fileio_module_exit(void) 644c66ac9dbSNicholas Bellinger { 645c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 646c66ac9dbSNicholas Bellinger } 647c66ac9dbSNicholas Bellinger 648c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 649c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 650c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 651c66ac9dbSNicholas Bellinger 652c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 653c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 654