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 * 6fd9a11d7SNicholas Bellinger * (c) Copyright 2005-2012 RisingTide Systems LLC. 7c66ac9dbSNicholas Bellinger * 8c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 9c66ac9dbSNicholas Bellinger * 10c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 11c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 12c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 13c66ac9dbSNicholas Bellinger * (at your option) any later version. 14c66ac9dbSNicholas Bellinger * 15c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 16c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 17c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 19c66ac9dbSNicholas Bellinger * 20c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 21c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 22c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23c66ac9dbSNicholas Bellinger * 24c66ac9dbSNicholas Bellinger ******************************************************************************/ 25c66ac9dbSNicholas Bellinger 26c66ac9dbSNicholas Bellinger #include <linux/string.h> 27c66ac9dbSNicholas Bellinger #include <linux/parser.h> 28c66ac9dbSNicholas Bellinger #include <linux/timer.h> 29c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 30c66ac9dbSNicholas Bellinger #include <linux/slab.h> 31c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 32827509e3SPaul Gortmaker #include <linux/module.h> 3370d3ae5cSAsias He #include <linux/falloc.h> 34c66ac9dbSNicholas Bellinger #include <scsi/scsi.h> 35c66ac9dbSNicholas Bellinger #include <scsi/scsi_host.h> 3650642762SAsias He #include <asm/unaligned.h> 37c66ac9dbSNicholas Bellinger 38c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 39c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 40c66ac9dbSNicholas Bellinger 41c66ac9dbSNicholas Bellinger #include "target_core_file.h" 42c66ac9dbSNicholas Bellinger 430fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev) 440fd97ccfSChristoph Hellwig { 450fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev); 460fd97ccfSChristoph Hellwig } 47c66ac9dbSNicholas Bellinger 48c66ac9dbSNicholas Bellinger /* fd_attach_hba(): (Part of se_subsystem_api_t template) 49c66ac9dbSNicholas Bellinger * 50c66ac9dbSNicholas Bellinger * 51c66ac9dbSNicholas Bellinger */ 52c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 53c66ac9dbSNicholas Bellinger { 54c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 55c66ac9dbSNicholas Bellinger 56c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 576708bb27SAndy Grover if (!fd_host) { 586708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 59e3d6f909SAndy Grover return -ENOMEM; 60c66ac9dbSNicholas Bellinger } 61c66ac9dbSNicholas Bellinger 62c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 63c66ac9dbSNicholas Bellinger 64e3d6f909SAndy Grover hba->hba_ptr = fd_host; 65c66ac9dbSNicholas Bellinger 666708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 67c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 68c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 696708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 70e3d6f909SAndy Grover " MaxSectors: %u\n", 71e3d6f909SAndy Grover hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); 72c66ac9dbSNicholas Bellinger 73c66ac9dbSNicholas Bellinger return 0; 74c66ac9dbSNicholas Bellinger } 75c66ac9dbSNicholas Bellinger 76c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 77c66ac9dbSNicholas Bellinger { 78c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 79c66ac9dbSNicholas Bellinger 806708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 81c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 82c66ac9dbSNicholas Bellinger 83c66ac9dbSNicholas Bellinger kfree(fd_host); 84c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 85c66ac9dbSNicholas Bellinger } 86c66ac9dbSNicholas Bellinger 870fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 88c66ac9dbSNicholas Bellinger { 89c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 908359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 91c66ac9dbSNicholas Bellinger 92c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 936708bb27SAndy Grover if (!fd_dev) { 946708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 95c66ac9dbSNicholas Bellinger return NULL; 96c66ac9dbSNicholas Bellinger } 97c66ac9dbSNicholas Bellinger 98c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 99c66ac9dbSNicholas Bellinger 1006708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 101c66ac9dbSNicholas Bellinger 1020fd97ccfSChristoph Hellwig return &fd_dev->dev; 103c66ac9dbSNicholas Bellinger } 104c66ac9dbSNicholas Bellinger 1050fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 106c66ac9dbSNicholas Bellinger { 1070fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1080fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 109c66ac9dbSNicholas Bellinger struct file *file; 110c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1110fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 112c66ac9dbSNicholas Bellinger 1130fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1140fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1150fd97ccfSChristoph Hellwig return -EINVAL; 1160fd97ccfSChristoph Hellwig } 117c66ac9dbSNicholas Bellinger 118c66ac9dbSNicholas Bellinger /* 119a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 120a4dff304SNicholas Bellinger * of pure timestamp updates. 121c66ac9dbSNicholas Bellinger */ 122a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1230fd97ccfSChristoph Hellwig 124b32f4c7eSNicholas Bellinger /* 125b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 126b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 127b32f4c7eSNicholas Bellinger * 128b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 129b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 130b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 131b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 132b32f4c7eSNicholas Bellinger */ 133b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 134b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 135b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 136b32f4c7eSNicholas Bellinger } 137c66ac9dbSNicholas Bellinger 138dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 139613640e4SNicholas Bellinger if (IS_ERR(file)) { 140dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 141613640e4SNicholas Bellinger ret = PTR_ERR(file); 142613640e4SNicholas Bellinger goto fail; 143613640e4SNicholas Bellinger } 144c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 145c66ac9dbSNicholas Bellinger /* 146c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 147c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 148c66ac9dbSNicholas Bellinger * 149c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 150c66ac9dbSNicholas Bellinger */ 151c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 152c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1530fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 154cd9323fdSNicholas Bellinger unsigned long long dev_size; 1550fd97ccfSChristoph Hellwig 15621363ca8SNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 157c66ac9dbSNicholas Bellinger /* 158c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 159c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 160c66ac9dbSNicholas Bellinger */ 161cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 162c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 163c66ac9dbSNicholas Bellinger 1646708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 165c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 166cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 167c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 16870d3ae5cSAsias He /* 16970d3ae5cSAsias He * Check if the underlying struct block_device request_queue supports 17070d3ae5cSAsias He * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 17170d3ae5cSAsias He * in ATA and we need to set TPE=1 17270d3ae5cSAsias He */ 17370d3ae5cSAsias He if (blk_queue_discard(q)) { 17470d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 17570d3ae5cSAsias He q->limits.max_discard_sectors; 17670d3ae5cSAsias He /* 17770d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 17870d3ae5cSAsias He */ 17970d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 18070d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 18170d3ae5cSAsias He q->limits.discard_granularity >> 9; 18270d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 18370d3ae5cSAsias He q->limits.discard_alignment; 18470d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 18570d3ae5cSAsias He " disabled by default\n"); 18670d3ae5cSAsias He } 18770d3ae5cSAsias He /* 18870d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 18970d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 19070d3ae5cSAsias He */ 19170d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1920463a3feSAsias He 1930463a3feSAsias He if (blk_queue_nonrot(q)) 1940463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 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 20321363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 20470d3ae5cSAsias He /* 20570d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 20670d3ae5cSAsias He */ 20770d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 20870d3ae5cSAsias He /* 20970d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 21070d3ae5cSAsias He */ 21170d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 21270d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 21370d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 21470d3ae5cSAsias He 21570d3ae5cSAsias He /* 21670d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 21770d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 21870d3ae5cSAsias He */ 21970d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 220c66ac9dbSNicholas Bellinger } 221c66ac9dbSNicholas Bellinger 22221363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 223e3e84cdaSAndy Grover dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; 2240fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 225c66ac9dbSNicholas Bellinger 226b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 227b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 228b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2290fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 230b32f4c7eSNicholas Bellinger } 231b32f4c7eSNicholas Bellinger 232c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 233c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 234c66ac9dbSNicholas Bellinger 2356708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 236c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 237c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 238c66ac9dbSNicholas Bellinger 2390fd97ccfSChristoph Hellwig return 0; 240c66ac9dbSNicholas Bellinger fail: 241c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 242c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 243c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 244c66ac9dbSNicholas Bellinger } 2450fd97ccfSChristoph Hellwig return ret; 246c66ac9dbSNicholas Bellinger } 247c66ac9dbSNicholas Bellinger 2480fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 249c66ac9dbSNicholas Bellinger { 2500fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 251c66ac9dbSNicholas Bellinger 252c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 253c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 254c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 255c66ac9dbSNicholas Bellinger } 256c66ac9dbSNicholas Bellinger 257c66ac9dbSNicholas Bellinger kfree(fd_dev); 258c66ac9dbSNicholas Bellinger } 259c66ac9dbSNicholas Bellinger 260778229afSSebastian Andrzej Siewior static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 261778229afSSebastian Andrzej Siewior u32 sgl_nents, int is_write) 262c66ac9dbSNicholas Bellinger { 2635787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 2640fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 2656708bb27SAndy Grover struct file *fd = dev->fd_file; 2665787cacdSChristoph Hellwig struct scatterlist *sg; 267c66ac9dbSNicholas Bellinger struct iovec *iov; 268c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2690fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 270c66ac9dbSNicholas Bellinger int ret = 0, i; 271c66ac9dbSNicholas Bellinger 2725787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2736708bb27SAndy Grover if (!iov) { 2746708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 275e3d6f909SAndy Grover return -ENOMEM; 276c66ac9dbSNicholas Bellinger } 277c66ac9dbSNicholas Bellinger 2785787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2799649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 28040ff2c3bSSebastian Andrzej Siewior iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 281c66ac9dbSNicholas Bellinger } 282c66ac9dbSNicholas Bellinger 283c66ac9dbSNicholas Bellinger old_fs = get_fs(); 284c66ac9dbSNicholas Bellinger set_fs(get_ds()); 285778229afSSebastian Andrzej Siewior 286778229afSSebastian Andrzej Siewior if (is_write) 287778229afSSebastian Andrzej Siewior ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 288778229afSSebastian Andrzej Siewior else 2895787cacdSChristoph Hellwig ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 290778229afSSebastian Andrzej Siewior 291c66ac9dbSNicholas Bellinger set_fs(old_fs); 292c66ac9dbSNicholas Bellinger 29340ff2c3bSSebastian Andrzej Siewior for_each_sg(sgl, sg, sgl_nents, i) 29440ff2c3bSSebastian Andrzej Siewior kunmap(sg_page(sg)); 295778229afSSebastian Andrzej Siewior 296c66ac9dbSNicholas Bellinger kfree(iov); 297778229afSSebastian Andrzej Siewior 298778229afSSebastian Andrzej Siewior if (is_write) { 299778229afSSebastian Andrzej Siewior if (ret < 0 || ret != cmd->data_length) { 300778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 301778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 302778229afSSebastian Andrzej Siewior } 303778229afSSebastian Andrzej Siewior } else { 304c66ac9dbSNicholas Bellinger /* 305c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 306c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 307c66ac9dbSNicholas Bellinger * block_device. 308c66ac9dbSNicholas Bellinger */ 309496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3105787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 311778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 312778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 313778229afSSebastian Andrzej Siewior cmd->data_length); 314e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 315c66ac9dbSNicholas Bellinger } 316c66ac9dbSNicholas Bellinger } else { 317c66ac9dbSNicholas Bellinger if (ret < 0) { 318778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 319778229afSSebastian Andrzej Siewior __func__, ret); 320e3d6f909SAndy Grover return ret; 321c66ac9dbSNicholas Bellinger } 322c66ac9dbSNicholas Bellinger } 323c66ac9dbSNicholas Bellinger } 324c66ac9dbSNicholas Bellinger return 1; 325c66ac9dbSNicholas Bellinger } 326c66ac9dbSNicholas Bellinger 327de103c93SChristoph Hellwig static sense_reason_t 328de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 329c66ac9dbSNicholas Bellinger { 330c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3310fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 332a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 333c66ac9dbSNicholas Bellinger loff_t start, end; 334c66ac9dbSNicholas Bellinger int ret; 335c66ac9dbSNicholas Bellinger 336c66ac9dbSNicholas Bellinger /* 337c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 338c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 339c66ac9dbSNicholas Bellinger */ 340c66ac9dbSNicholas Bellinger if (immed) 3415787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 342c66ac9dbSNicholas Bellinger 343c66ac9dbSNicholas Bellinger /* 344c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 345c66ac9dbSNicholas Bellinger */ 346a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 347c66ac9dbSNicholas Bellinger start = 0; 348c66ac9dbSNicholas Bellinger end = LLONG_MAX; 349c66ac9dbSNicholas Bellinger } else { 3500fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 351c66ac9dbSNicholas Bellinger if (cmd->data_length) 352c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 353c66ac9dbSNicholas Bellinger else 354c66ac9dbSNicholas Bellinger end = LLONG_MAX; 355c66ac9dbSNicholas Bellinger } 356c66ac9dbSNicholas Bellinger 357c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 358c66ac9dbSNicholas Bellinger if (ret != 0) 3596708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 360c66ac9dbSNicholas Bellinger 3615787cacdSChristoph Hellwig if (immed) 362ad67f0d9SChristoph Hellwig return 0; 3635787cacdSChristoph Hellwig 364de103c93SChristoph Hellwig if (ret) 3655787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 366de103c93SChristoph Hellwig else 3675787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 368ad67f0d9SChristoph Hellwig 369ad67f0d9SChristoph Hellwig return 0; 370c66ac9dbSNicholas Bellinger } 371c66ac9dbSNicholas Bellinger 3727b745c84SNicholas Bellinger static unsigned char * 3737b745c84SNicholas Bellinger fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 3747b745c84SNicholas Bellinger unsigned int len) 3757b745c84SNicholas Bellinger { 3767b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 3777b745c84SNicholas Bellinger unsigned int block_size = se_dev->dev_attrib.block_size; 3787b745c84SNicholas Bellinger unsigned int i = 0, end; 3797b745c84SNicholas Bellinger unsigned char *buf, *p, *kmap_buf; 3807b745c84SNicholas Bellinger 3817b745c84SNicholas Bellinger buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 3827b745c84SNicholas Bellinger if (!buf) { 3837b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same buf\n"); 3847b745c84SNicholas Bellinger return NULL; 3857b745c84SNicholas Bellinger } 3867b745c84SNicholas Bellinger 3877b745c84SNicholas Bellinger kmap_buf = kmap(sg_page(sg)) + sg->offset; 3887b745c84SNicholas Bellinger if (!kmap_buf) { 3897b745c84SNicholas Bellinger pr_err("kmap() failed in fd_setup_write_same\n"); 3907b745c84SNicholas Bellinger kfree(buf); 3917b745c84SNicholas Bellinger return NULL; 3927b745c84SNicholas Bellinger } 3937b745c84SNicholas Bellinger /* 3947b745c84SNicholas Bellinger * Fill local *buf to contain multiple WRITE_SAME blocks up to 3957b745c84SNicholas Bellinger * min(len, PAGE_SIZE) 3967b745c84SNicholas Bellinger */ 3977b745c84SNicholas Bellinger p = buf; 3987b745c84SNicholas Bellinger end = min_t(unsigned int, len, PAGE_SIZE); 3997b745c84SNicholas Bellinger 4007b745c84SNicholas Bellinger while (i < end) { 4017b745c84SNicholas Bellinger memcpy(p, kmap_buf, block_size); 4027b745c84SNicholas Bellinger 4037b745c84SNicholas Bellinger i += block_size; 4047b745c84SNicholas Bellinger p += block_size; 4057b745c84SNicholas Bellinger } 4067b745c84SNicholas Bellinger kunmap(sg_page(sg)); 4077b745c84SNicholas Bellinger 4087b745c84SNicholas Bellinger return buf; 4097b745c84SNicholas Bellinger } 4107b745c84SNicholas Bellinger 4117b745c84SNicholas Bellinger static sense_reason_t 4127b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 4137b745c84SNicholas Bellinger { 4147b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4157b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 4167b745c84SNicholas Bellinger struct file *f = fd_dev->fd_file; 4177b745c84SNicholas Bellinger struct scatterlist *sg; 4187b745c84SNicholas Bellinger struct iovec *iov; 4197b745c84SNicholas Bellinger mm_segment_t old_fs; 420972b29c8SRoland Dreier sector_t nolb = sbc_get_write_same_sectors(cmd); 4217b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 4227b745c84SNicholas Bellinger unsigned int len, len_tmp, iov_num; 4237b745c84SNicholas Bellinger int i, rc; 4247b745c84SNicholas Bellinger unsigned char *buf; 4257b745c84SNicholas Bellinger 4267b745c84SNicholas Bellinger if (!nolb) { 4277b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4287b745c84SNicholas Bellinger return 0; 4297b745c84SNicholas Bellinger } 4307b745c84SNicholas Bellinger sg = &cmd->t_data_sg[0]; 4317b745c84SNicholas Bellinger 4327b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 4337b745c84SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 4347b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 4357b745c84SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 4367b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 4377b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4387b745c84SNicholas Bellinger } 4397b745c84SNicholas Bellinger 4407b745c84SNicholas Bellinger len = len_tmp = nolb * se_dev->dev_attrib.block_size; 4417b745c84SNicholas Bellinger iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 4427b745c84SNicholas Bellinger 4437b745c84SNicholas Bellinger buf = fd_setup_write_same_buf(cmd, sg, len); 4447b745c84SNicholas Bellinger if (!buf) 4457b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4467b745c84SNicholas Bellinger 4477b745c84SNicholas Bellinger iov = vzalloc(sizeof(struct iovec) * iov_num); 4487b745c84SNicholas Bellinger if (!iov) { 4497b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 4507b745c84SNicholas Bellinger kfree(buf); 4517b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4527b745c84SNicholas Bellinger } 4537b745c84SNicholas Bellinger /* 4547b745c84SNicholas Bellinger * Map the single fabric received scatterlist block now populated 4557b745c84SNicholas Bellinger * in *buf into each iovec for I/O submission. 4567b745c84SNicholas Bellinger */ 4577b745c84SNicholas Bellinger for (i = 0; i < iov_num; i++) { 4587b745c84SNicholas Bellinger iov[i].iov_base = buf; 4597b745c84SNicholas Bellinger iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 4607b745c84SNicholas Bellinger len_tmp -= iov[i].iov_len; 4617b745c84SNicholas Bellinger } 4627b745c84SNicholas Bellinger 4637b745c84SNicholas Bellinger old_fs = get_fs(); 4647b745c84SNicholas Bellinger set_fs(get_ds()); 4657b745c84SNicholas Bellinger rc = vfs_writev(f, &iov[0], iov_num, &pos); 4667b745c84SNicholas Bellinger set_fs(old_fs); 4677b745c84SNicholas Bellinger 4687b745c84SNicholas Bellinger vfree(iov); 4697b745c84SNicholas Bellinger kfree(buf); 4707b745c84SNicholas Bellinger 4717b745c84SNicholas Bellinger if (rc < 0 || rc != len) { 4727b745c84SNicholas Bellinger pr_err("vfs_writev() returned %d for write same\n", rc); 4737b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4747b745c84SNicholas Bellinger } 4757b745c84SNicholas Bellinger 4767b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4777b745c84SNicholas Bellinger return 0; 4787b745c84SNicholas Bellinger } 4797b745c84SNicholas Bellinger 480de103c93SChristoph Hellwig static sense_reason_t 48186d71829SAsias He fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 48270d3ae5cSAsias He { 48386d71829SAsias He struct file *file = priv; 48470d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 48570d3ae5cSAsias He int ret; 48670d3ae5cSAsias He 48770d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 48870d3ae5cSAsias He /* The backend is block device, use discard */ 48970d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 49070d3ae5cSAsias He 49143f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 49270d3ae5cSAsias He nolb, GFP_KERNEL, 0); 49370d3ae5cSAsias He if (ret < 0) { 49470d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 49570d3ae5cSAsias He ret); 49670d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 49770d3ae5cSAsias He } 49870d3ae5cSAsias He } else { 49970d3ae5cSAsias He /* The backend is normal file, use fallocate */ 50043f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 50143f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 50270d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 50370d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 50470d3ae5cSAsias He 50570d3ae5cSAsias He if (!file->f_op->fallocate) 50670d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50770d3ae5cSAsias He 50870d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 50970d3ae5cSAsias He if (ret < 0) { 51070d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 51170d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51270d3ae5cSAsias He } 51370d3ae5cSAsias He } 51470d3ae5cSAsias He 51543f55bbbSAsias He return 0; 51643f55bbbSAsias He } 51743f55bbbSAsias He 51843f55bbbSAsias He static sense_reason_t 51943f55bbbSAsias He fd_execute_write_same_unmap(struct se_cmd *cmd) 52043f55bbbSAsias He { 52143f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 52243f55bbbSAsias He struct fd_dev *fd_dev = FD_DEV(se_dev); 52343f55bbbSAsias He struct file *file = fd_dev->fd_file; 52443f55bbbSAsias He sector_t lba = cmd->t_task_lba; 52543f55bbbSAsias He sector_t nolb = sbc_get_write_same_sectors(cmd); 52643f55bbbSAsias He int ret; 52743f55bbbSAsias He 52843f55bbbSAsias He if (!nolb) { 52943f55bbbSAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 53043f55bbbSAsias He return 0; 53143f55bbbSAsias He } 53243f55bbbSAsias He 53343f55bbbSAsias He ret = fd_do_unmap(cmd, file, lba, nolb); 53443f55bbbSAsias He if (ret) 53543f55bbbSAsias He return ret; 53643f55bbbSAsias He 53770d3ae5cSAsias He target_complete_cmd(cmd, GOOD); 53870d3ae5cSAsias He return 0; 53970d3ae5cSAsias He } 54070d3ae5cSAsias He 54170d3ae5cSAsias He static sense_reason_t 54250642762SAsias He fd_execute_unmap(struct se_cmd *cmd) 54350642762SAsias He { 54486d71829SAsias He struct file *file = FD_DEV(cmd->se_dev)->fd_file; 54550642762SAsias He 54686d71829SAsias He return sbc_execute_unmap(cmd, fd_do_unmap, file); 54750642762SAsias He } 54850642762SAsias He 54950642762SAsias He static sense_reason_t 550de103c93SChristoph Hellwig fd_execute_rw(struct se_cmd *cmd) 551c66ac9dbSNicholas Bellinger { 5520c2ad7d1SChristoph Hellwig struct scatterlist *sgl = cmd->t_data_sg; 5530c2ad7d1SChristoph Hellwig u32 sgl_nents = cmd->t_data_nents; 5540c2ad7d1SChristoph Hellwig enum dma_data_direction data_direction = cmd->data_direction; 555c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 556c66ac9dbSNicholas Bellinger int ret = 0; 557c66ac9dbSNicholas Bellinger 558c66ac9dbSNicholas Bellinger /* 559c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 560c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 561c66ac9dbSNicholas Bellinger */ 5625787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 563778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 564c66ac9dbSNicholas Bellinger } else { 565778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 566a4dff304SNicholas Bellinger /* 567a4dff304SNicholas Bellinger * Perform implict vfs_fsync_range() for fd_do_writev() ops 568a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 569a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 570a4dff304SNicholas Bellinger */ 571c66ac9dbSNicholas Bellinger if (ret > 0 && 5720fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_fua_write > 0 && 5732d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 5740fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 575a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 5760fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 577a4dff304SNicholas Bellinger loff_t end = start + cmd->data_length; 578c66ac9dbSNicholas Bellinger 579a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 580a4dff304SNicholas Bellinger } 581c66ac9dbSNicholas Bellinger } 582c66ac9dbSNicholas Bellinger 583de103c93SChristoph Hellwig if (ret < 0) 584de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 585de103c93SChristoph Hellwig 5865787cacdSChristoph Hellwig if (ret) 5875787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 58803e98c9eSNicholas Bellinger return 0; 589c66ac9dbSNicholas Bellinger } 590c66ac9dbSNicholas Bellinger 591c66ac9dbSNicholas Bellinger enum { 592c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 593c66ac9dbSNicholas Bellinger }; 594c66ac9dbSNicholas Bellinger 595c66ac9dbSNicholas Bellinger static match_table_t tokens = { 596c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 597c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 598b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 599c66ac9dbSNicholas Bellinger {Opt_err, NULL} 600c66ac9dbSNicholas Bellinger }; 601c66ac9dbSNicholas Bellinger 6020fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 603c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 604c66ac9dbSNicholas Bellinger { 6050fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 606c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 607c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 608b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 609c66ac9dbSNicholas Bellinger 610c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 611c66ac9dbSNicholas Bellinger if (!opts) 612c66ac9dbSNicholas Bellinger return -ENOMEM; 613c66ac9dbSNicholas Bellinger 614c66ac9dbSNicholas Bellinger orig = opts; 615c66ac9dbSNicholas Bellinger 61690c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 617c66ac9dbSNicholas Bellinger if (!*ptr) 618c66ac9dbSNicholas Bellinger continue; 619c66ac9dbSNicholas Bellinger 620c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 621c66ac9dbSNicholas Bellinger switch (token) { 622c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 623dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 624dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 625dbc6e022SAl Viro ret = -EINVAL; 6266d180253SJesper Juhl break; 6276d180253SJesper Juhl } 6286708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 629c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 630c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 631c66ac9dbSNicholas Bellinger break; 632c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 633c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 6346d180253SJesper Juhl if (!arg_p) { 6356d180253SJesper Juhl ret = -ENOMEM; 6366d180253SJesper Juhl break; 6376d180253SJesper Juhl } 63857103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 6396d180253SJesper Juhl kfree(arg_p); 640c66ac9dbSNicholas Bellinger if (ret < 0) { 64157103d7fSJingoo Han pr_err("kstrtoull() failed for" 642c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 643c66ac9dbSNicholas Bellinger goto out; 644c66ac9dbSNicholas Bellinger } 6456708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 646c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 647c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 648c66ac9dbSNicholas Bellinger break; 649b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 650b32f4c7eSNicholas Bellinger match_int(args, &arg); 651b32f4c7eSNicholas Bellinger if (arg != 1) { 652b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 653b32f4c7eSNicholas Bellinger ret = -EINVAL; 654b32f4c7eSNicholas Bellinger goto out; 655b32f4c7eSNicholas Bellinger } 656b32f4c7eSNicholas Bellinger 657b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 658b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 659b32f4c7eSNicholas Bellinger 660b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 661b32f4c7eSNicholas Bellinger break; 662c66ac9dbSNicholas Bellinger default: 663c66ac9dbSNicholas Bellinger break; 664c66ac9dbSNicholas Bellinger } 665c66ac9dbSNicholas Bellinger } 666c66ac9dbSNicholas Bellinger 667c66ac9dbSNicholas Bellinger out: 668c66ac9dbSNicholas Bellinger kfree(orig); 669c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 670c66ac9dbSNicholas Bellinger } 671c66ac9dbSNicholas Bellinger 6720fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 673c66ac9dbSNicholas Bellinger { 6740fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 675c66ac9dbSNicholas Bellinger ssize_t bl = 0; 676c66ac9dbSNicholas Bellinger 677c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 678b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 679b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 680b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 681b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 682c66ac9dbSNicholas Bellinger return bl; 683c66ac9dbSNicholas Bellinger } 684c66ac9dbSNicholas Bellinger 685c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 686c66ac9dbSNicholas Bellinger { 6870fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 688cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 689cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 690cd9323fdSNicholas Bellinger unsigned long long dev_size; 691cd9323fdSNicholas Bellinger /* 692cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 693cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 694cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 695cd9323fdSNicholas Bellinger */ 696cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 69721363ca8SNicholas Bellinger dev_size = i_size_read(i); 698cd9323fdSNicholas Bellinger else 699cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 700c66ac9dbSNicholas Bellinger 70121363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 70221363ca8SNicholas Bellinger dev->dev_attrib.block_size); 703c66ac9dbSNicholas Bellinger } 704c66ac9dbSNicholas Bellinger 7059e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 7060c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 707ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 7087b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 70970d3ae5cSAsias He .execute_write_same_unmap = fd_execute_write_same_unmap, 71050642762SAsias He .execute_unmap = fd_execute_unmap, 7110c2ad7d1SChristoph Hellwig }; 7120c2ad7d1SChristoph Hellwig 713de103c93SChristoph Hellwig static sense_reason_t 714de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 7150c2ad7d1SChristoph Hellwig { 7169e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 7170c2ad7d1SChristoph Hellwig } 7180c2ad7d1SChristoph Hellwig 719c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 720c66ac9dbSNicholas Bellinger .name = "fileio", 7210fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 7220fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 723c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 724c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 725c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 726c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 7270fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 7280fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 729c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 7300c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 731c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 732c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 7336f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 734c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 735c66ac9dbSNicholas Bellinger }; 736c66ac9dbSNicholas Bellinger 737c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 738c66ac9dbSNicholas Bellinger { 739c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 740c66ac9dbSNicholas Bellinger } 741c66ac9dbSNicholas Bellinger 74263b91d5aSAsias He static void __exit fileio_module_exit(void) 743c66ac9dbSNicholas Bellinger { 744c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 745c66ac9dbSNicholas Bellinger } 746c66ac9dbSNicholas Bellinger 747c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 748c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 749c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 750c66ac9dbSNicholas Bellinger 751c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 752c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 753