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 440fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev) 450fd97ccfSChristoph Hellwig { 460fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev); 470fd97ccfSChristoph Hellwig } 48c66ac9dbSNicholas Bellinger 49c66ac9dbSNicholas Bellinger /* fd_attach_hba(): (Part of se_subsystem_api_t template) 50c66ac9dbSNicholas Bellinger * 51c66ac9dbSNicholas Bellinger * 52c66ac9dbSNicholas Bellinger */ 53c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 54c66ac9dbSNicholas Bellinger { 55c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 56c66ac9dbSNicholas Bellinger 57c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 586708bb27SAndy Grover if (!fd_host) { 596708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 60e3d6f909SAndy Grover return -ENOMEM; 61c66ac9dbSNicholas Bellinger } 62c66ac9dbSNicholas Bellinger 63c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 64c66ac9dbSNicholas Bellinger 65e3d6f909SAndy Grover hba->hba_ptr = fd_host; 66c66ac9dbSNicholas Bellinger 676708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 68c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 69c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 706708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 71e3d6f909SAndy Grover " MaxSectors: %u\n", 72e3d6f909SAndy Grover hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); 73c66ac9dbSNicholas Bellinger 74c66ac9dbSNicholas Bellinger return 0; 75c66ac9dbSNicholas Bellinger } 76c66ac9dbSNicholas Bellinger 77c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 78c66ac9dbSNicholas Bellinger { 79c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 80c66ac9dbSNicholas Bellinger 816708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 82c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 83c66ac9dbSNicholas Bellinger 84c66ac9dbSNicholas Bellinger kfree(fd_host); 85c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 86c66ac9dbSNicholas Bellinger } 87c66ac9dbSNicholas Bellinger 880fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 89c66ac9dbSNicholas Bellinger { 90c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 918359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 92c66ac9dbSNicholas Bellinger 93c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 946708bb27SAndy Grover if (!fd_dev) { 956708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 96c66ac9dbSNicholas Bellinger return NULL; 97c66ac9dbSNicholas Bellinger } 98c66ac9dbSNicholas Bellinger 99c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 100c66ac9dbSNicholas Bellinger 1016708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 102c66ac9dbSNicholas Bellinger 1030fd97ccfSChristoph Hellwig return &fd_dev->dev; 104c66ac9dbSNicholas Bellinger } 105c66ac9dbSNicholas Bellinger 1060fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 107c66ac9dbSNicholas Bellinger { 1080fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1090fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 110c66ac9dbSNicholas Bellinger struct file *file; 111c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1120fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 113c66ac9dbSNicholas Bellinger 1140fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1150fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1160fd97ccfSChristoph Hellwig return -EINVAL; 1170fd97ccfSChristoph Hellwig } 118c66ac9dbSNicholas Bellinger 119c66ac9dbSNicholas Bellinger /* 120a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 121a4dff304SNicholas Bellinger * of pure timestamp updates. 122c66ac9dbSNicholas Bellinger */ 123a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1240fd97ccfSChristoph Hellwig 125b32f4c7eSNicholas Bellinger /* 126b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 127b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 128b32f4c7eSNicholas Bellinger * 129b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 130b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 131b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 132b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 133b32f4c7eSNicholas Bellinger */ 134b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 135b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 136b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 137b32f4c7eSNicholas Bellinger } 138c66ac9dbSNicholas Bellinger 139dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 140613640e4SNicholas Bellinger if (IS_ERR(file)) { 141dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 142613640e4SNicholas Bellinger ret = PTR_ERR(file); 143613640e4SNicholas Bellinger goto fail; 144613640e4SNicholas Bellinger } 145c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 146c66ac9dbSNicholas Bellinger /* 147c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 148c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 149c66ac9dbSNicholas Bellinger * 150c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 151c66ac9dbSNicholas Bellinger */ 152c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 153c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1540fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 155cd9323fdSNicholas Bellinger unsigned long long dev_size; 1560fd97ccfSChristoph Hellwig 1570fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = 1580fd97ccfSChristoph Hellwig bdev_logical_block_size(inode->i_bdev); 1590fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); 1600fd97ccfSChristoph Hellwig 161c66ac9dbSNicholas Bellinger /* 162c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 163c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 164c66ac9dbSNicholas Bellinger */ 165cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 166c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 167c66ac9dbSNicholas Bellinger 1686708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 169c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 170cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 171c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 172c66ac9dbSNicholas Bellinger } else { 173c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1746708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 175c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 176c66ac9dbSNicholas Bellinger " block_device\n"); 177c66ac9dbSNicholas Bellinger goto fail; 178c66ac9dbSNicholas Bellinger } 179c66ac9dbSNicholas Bellinger 1800fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; 1810fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; 182c66ac9dbSNicholas Bellinger } 183c66ac9dbSNicholas Bellinger 1840fd97ccfSChristoph Hellwig fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; 185c66ac9dbSNicholas Bellinger 1860fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 187c66ac9dbSNicholas Bellinger 188b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 189b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 190b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 1910fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 192b32f4c7eSNicholas Bellinger } 193b32f4c7eSNicholas Bellinger 194c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 195c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 196c66ac9dbSNicholas Bellinger 1976708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 198c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 199c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 200c66ac9dbSNicholas Bellinger 2010fd97ccfSChristoph Hellwig return 0; 202c66ac9dbSNicholas Bellinger fail: 203c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 204c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 205c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 206c66ac9dbSNicholas Bellinger } 2070fd97ccfSChristoph Hellwig return ret; 208c66ac9dbSNicholas Bellinger } 209c66ac9dbSNicholas Bellinger 2100fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 211c66ac9dbSNicholas Bellinger { 2120fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 213c66ac9dbSNicholas Bellinger 214c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 215c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 216c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 217c66ac9dbSNicholas Bellinger } 218c66ac9dbSNicholas Bellinger 219c66ac9dbSNicholas Bellinger kfree(fd_dev); 220c66ac9dbSNicholas Bellinger } 221c66ac9dbSNicholas Bellinger 2225787cacdSChristoph Hellwig static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, 2235787cacdSChristoph Hellwig u32 sgl_nents) 224c66ac9dbSNicholas Bellinger { 2255787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 2260fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 2276708bb27SAndy Grover struct file *fd = dev->fd_file; 2285787cacdSChristoph Hellwig struct scatterlist *sg; 229c66ac9dbSNicholas Bellinger struct iovec *iov; 230c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2310fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 232c66ac9dbSNicholas Bellinger int ret = 0, i; 233c66ac9dbSNicholas Bellinger 2345787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2356708bb27SAndy Grover if (!iov) { 2366708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 237e3d6f909SAndy Grover return -ENOMEM; 238c66ac9dbSNicholas Bellinger } 239c66ac9dbSNicholas Bellinger 2405787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2419649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 2429649fa1bSSebastian Andrzej Siewior iov[i].iov_base = sg_virt(sg); 243c66ac9dbSNicholas Bellinger } 244c66ac9dbSNicholas Bellinger 245c66ac9dbSNicholas Bellinger old_fs = get_fs(); 246c66ac9dbSNicholas Bellinger set_fs(get_ds()); 2475787cacdSChristoph Hellwig ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 248c66ac9dbSNicholas Bellinger set_fs(old_fs); 249c66ac9dbSNicholas Bellinger 250c66ac9dbSNicholas Bellinger kfree(iov); 251c66ac9dbSNicholas Bellinger /* 252c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 253c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 254c66ac9dbSNicholas Bellinger * block_device. 255c66ac9dbSNicholas Bellinger */ 256c66ac9dbSNicholas Bellinger if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { 2575787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 2586708bb27SAndy Grover pr_err("vfs_readv() returned %d," 259c66ac9dbSNicholas Bellinger " expecting %d for S_ISBLK\n", ret, 2605787cacdSChristoph Hellwig (int)cmd->data_length); 261e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 262c66ac9dbSNicholas Bellinger } 263c66ac9dbSNicholas Bellinger } else { 264c66ac9dbSNicholas Bellinger if (ret < 0) { 2656708bb27SAndy Grover pr_err("vfs_readv() returned %d for non" 266c66ac9dbSNicholas Bellinger " S_ISBLK\n", ret); 267e3d6f909SAndy Grover return ret; 268c66ac9dbSNicholas Bellinger } 269c66ac9dbSNicholas Bellinger } 270c66ac9dbSNicholas Bellinger 271c66ac9dbSNicholas Bellinger return 1; 272c66ac9dbSNicholas Bellinger } 273c66ac9dbSNicholas Bellinger 2745787cacdSChristoph Hellwig static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, 2755787cacdSChristoph Hellwig u32 sgl_nents) 276c66ac9dbSNicholas Bellinger { 2775787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 2780fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 2796708bb27SAndy Grover struct file *fd = dev->fd_file; 2805787cacdSChristoph Hellwig struct scatterlist *sg; 281c66ac9dbSNicholas Bellinger struct iovec *iov; 282c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2830fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 284c66ac9dbSNicholas Bellinger int ret, i = 0; 285c66ac9dbSNicholas Bellinger 2865787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2876708bb27SAndy Grover if (!iov) { 2886708bb27SAndy Grover pr_err("Unable to allocate fd_do_writev iov[]\n"); 289e3d6f909SAndy Grover return -ENOMEM; 290c66ac9dbSNicholas Bellinger } 291c66ac9dbSNicholas Bellinger 2925787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2939649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 2949649fa1bSSebastian Andrzej Siewior iov[i].iov_base = sg_virt(sg); 295c66ac9dbSNicholas Bellinger } 296c66ac9dbSNicholas Bellinger 297c66ac9dbSNicholas Bellinger old_fs = get_fs(); 298c66ac9dbSNicholas Bellinger set_fs(get_ds()); 2995787cacdSChristoph Hellwig ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 300c66ac9dbSNicholas Bellinger set_fs(old_fs); 301c66ac9dbSNicholas Bellinger 302c66ac9dbSNicholas Bellinger kfree(iov); 303c66ac9dbSNicholas Bellinger 3045787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 3056708bb27SAndy Grover pr_err("vfs_writev() returned %d\n", ret); 306e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 307c66ac9dbSNicholas Bellinger } 308c66ac9dbSNicholas Bellinger 309c66ac9dbSNicholas Bellinger return 1; 310c66ac9dbSNicholas Bellinger } 311c66ac9dbSNicholas Bellinger 312ad67f0d9SChristoph Hellwig static int fd_execute_sync_cache(struct se_cmd *cmd) 313c66ac9dbSNicholas Bellinger { 314c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3150fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 316a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 317c66ac9dbSNicholas Bellinger loff_t start, end; 318c66ac9dbSNicholas Bellinger int ret; 319c66ac9dbSNicholas Bellinger 320c66ac9dbSNicholas Bellinger /* 321c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 322c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 323c66ac9dbSNicholas Bellinger */ 324c66ac9dbSNicholas Bellinger if (immed) 3255787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 326c66ac9dbSNicholas Bellinger 327c66ac9dbSNicholas Bellinger /* 328c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 329c66ac9dbSNicholas Bellinger */ 330a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 331c66ac9dbSNicholas Bellinger start = 0; 332c66ac9dbSNicholas Bellinger end = LLONG_MAX; 333c66ac9dbSNicholas Bellinger } else { 3340fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 335c66ac9dbSNicholas Bellinger if (cmd->data_length) 336c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 337c66ac9dbSNicholas Bellinger else 338c66ac9dbSNicholas Bellinger end = LLONG_MAX; 339c66ac9dbSNicholas Bellinger } 340c66ac9dbSNicholas Bellinger 341c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 342c66ac9dbSNicholas Bellinger if (ret != 0) 3436708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 344c66ac9dbSNicholas Bellinger 3455787cacdSChristoph Hellwig if (immed) 346ad67f0d9SChristoph Hellwig return 0; 3475787cacdSChristoph Hellwig 3485787cacdSChristoph Hellwig if (ret) { 3495787cacdSChristoph Hellwig cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3505787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 3515787cacdSChristoph Hellwig } else { 3525787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 3535787cacdSChristoph Hellwig } 354ad67f0d9SChristoph Hellwig 355ad67f0d9SChristoph Hellwig return 0; 356c66ac9dbSNicholas Bellinger } 357c66ac9dbSNicholas Bellinger 3580c2ad7d1SChristoph Hellwig static int fd_execute_rw(struct se_cmd *cmd) 359c66ac9dbSNicholas Bellinger { 3600c2ad7d1SChristoph Hellwig struct scatterlist *sgl = cmd->t_data_sg; 3610c2ad7d1SChristoph Hellwig u32 sgl_nents = cmd->t_data_nents; 3620c2ad7d1SChristoph Hellwig enum dma_data_direction data_direction = cmd->data_direction; 363c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 364c66ac9dbSNicholas Bellinger int ret = 0; 365c66ac9dbSNicholas Bellinger 366c66ac9dbSNicholas Bellinger /* 367c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 368c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 369c66ac9dbSNicholas Bellinger */ 3705787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 3715787cacdSChristoph Hellwig ret = fd_do_readv(cmd, sgl, sgl_nents); 372c66ac9dbSNicholas Bellinger } else { 3735787cacdSChristoph Hellwig ret = fd_do_writev(cmd, sgl, sgl_nents); 374a4dff304SNicholas Bellinger /* 375a4dff304SNicholas Bellinger * Perform implict vfs_fsync_range() for fd_do_writev() ops 376a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 377a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 378a4dff304SNicholas Bellinger */ 379c66ac9dbSNicholas Bellinger if (ret > 0 && 3800fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_fua_write > 0 && 3812d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 3820fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 383a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 3840fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 385a4dff304SNicholas Bellinger loff_t end = start + cmd->data_length; 386c66ac9dbSNicholas Bellinger 387a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 388a4dff304SNicholas Bellinger } 389c66ac9dbSNicholas Bellinger } 390c66ac9dbSNicholas Bellinger 39103e98c9eSNicholas Bellinger if (ret < 0) { 39203e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 393c66ac9dbSNicholas Bellinger return ret; 39403e98c9eSNicholas Bellinger } 3955787cacdSChristoph Hellwig if (ret) 3965787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 39703e98c9eSNicholas Bellinger return 0; 398c66ac9dbSNicholas Bellinger } 399c66ac9dbSNicholas Bellinger 400c66ac9dbSNicholas Bellinger enum { 401c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 402c66ac9dbSNicholas Bellinger }; 403c66ac9dbSNicholas Bellinger 404c66ac9dbSNicholas Bellinger static match_table_t tokens = { 405c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 406c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 407b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 408c66ac9dbSNicholas Bellinger {Opt_err, NULL} 409c66ac9dbSNicholas Bellinger }; 410c66ac9dbSNicholas Bellinger 4110fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 412c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 413c66ac9dbSNicholas Bellinger { 4140fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 415c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 416c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 417b32f4c7eSNicholas Bellinger int ret = 0, arg, 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; 458b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 459b32f4c7eSNicholas Bellinger match_int(args, &arg); 460b32f4c7eSNicholas Bellinger if (arg != 1) { 461b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 462b32f4c7eSNicholas Bellinger ret = -EINVAL; 463b32f4c7eSNicholas Bellinger goto out; 464b32f4c7eSNicholas Bellinger } 465b32f4c7eSNicholas Bellinger 466b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 467b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 468b32f4c7eSNicholas Bellinger 469b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 470b32f4c7eSNicholas Bellinger break; 471c66ac9dbSNicholas Bellinger default: 472c66ac9dbSNicholas Bellinger break; 473c66ac9dbSNicholas Bellinger } 474c66ac9dbSNicholas Bellinger } 475c66ac9dbSNicholas Bellinger 476c66ac9dbSNicholas Bellinger out: 477c66ac9dbSNicholas Bellinger kfree(orig); 478c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 479c66ac9dbSNicholas Bellinger } 480c66ac9dbSNicholas Bellinger 4810fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 482c66ac9dbSNicholas Bellinger { 4830fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 484c66ac9dbSNicholas Bellinger ssize_t bl = 0; 485c66ac9dbSNicholas Bellinger 486c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 487b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 488b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 489b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 490b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 491c66ac9dbSNicholas Bellinger return bl; 492c66ac9dbSNicholas Bellinger } 493c66ac9dbSNicholas Bellinger 494c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 495c66ac9dbSNicholas Bellinger { 4960fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 497cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 498cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 499cd9323fdSNicholas Bellinger unsigned long long dev_size; 500cd9323fdSNicholas Bellinger /* 501cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 502cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 503cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 504cd9323fdSNicholas Bellinger */ 505cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 506cd9323fdSNicholas Bellinger dev_size = (i_size_read(i) - fd_dev->fd_block_size); 507cd9323fdSNicholas Bellinger else 508cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 509c66ac9dbSNicholas Bellinger 5100fd97ccfSChristoph Hellwig return div_u64(dev_size, dev->dev_attrib.block_size); 511c66ac9dbSNicholas Bellinger } 512c66ac9dbSNicholas Bellinger 5139e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 5140c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 515ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 5160c2ad7d1SChristoph Hellwig }; 5170c2ad7d1SChristoph Hellwig 5180c2ad7d1SChristoph Hellwig static int fd_parse_cdb(struct se_cmd *cmd) 5190c2ad7d1SChristoph Hellwig { 5209e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 5210c2ad7d1SChristoph Hellwig } 5220c2ad7d1SChristoph Hellwig 523c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 524c66ac9dbSNicholas Bellinger .name = "fileio", 5250fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 5260fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 527c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 528c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 529c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 530c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 5310fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 5320fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 533c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 5340c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 535c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 536c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 5376f23ac8aSChristoph Hellwig .get_device_rev = sbc_get_device_rev, 5386f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 539c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 540c66ac9dbSNicholas Bellinger }; 541c66ac9dbSNicholas Bellinger 542c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 543c66ac9dbSNicholas Bellinger { 544c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 545c66ac9dbSNicholas Bellinger } 546c66ac9dbSNicholas Bellinger 547c66ac9dbSNicholas Bellinger static void fileio_module_exit(void) 548c66ac9dbSNicholas Bellinger { 549c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 550c66ac9dbSNicholas Bellinger } 551c66ac9dbSNicholas Bellinger 552c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 553c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 554c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 555c66ac9dbSNicholas Bellinger 556c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 557c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 558