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 1560fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = 1570fd97ccfSChristoph Hellwig bdev_logical_block_size(inode->i_bdev); 1580fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); 1590fd97ccfSChristoph Hellwig 160c66ac9dbSNicholas Bellinger /* 161c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 162c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 163c66ac9dbSNicholas Bellinger */ 164cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 165c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 166c66ac9dbSNicholas Bellinger 1676708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 168c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 169cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 170c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 17170d3ae5cSAsias He /* 17270d3ae5cSAsias He * Check if the underlying struct block_device request_queue supports 17370d3ae5cSAsias He * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 17470d3ae5cSAsias He * in ATA and we need to set TPE=1 17570d3ae5cSAsias He */ 17670d3ae5cSAsias He if (blk_queue_discard(q)) { 17770d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 17870d3ae5cSAsias He q->limits.max_discard_sectors; 17970d3ae5cSAsias He /* 18070d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 18170d3ae5cSAsias He */ 18270d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 18370d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 18470d3ae5cSAsias He q->limits.discard_granularity >> 9; 18570d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 18670d3ae5cSAsias He q->limits.discard_alignment; 18770d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 18870d3ae5cSAsias He " disabled by default\n"); 18970d3ae5cSAsias He } 19070d3ae5cSAsias He /* 19170d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 19270d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 19370d3ae5cSAsias He */ 19470d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1950463a3feSAsias He 1960463a3feSAsias He if (blk_queue_nonrot(q)) 1970463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 198c66ac9dbSNicholas Bellinger } else { 199c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 2006708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 201c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 202c66ac9dbSNicholas Bellinger " block_device\n"); 203c66ac9dbSNicholas Bellinger goto fail; 204c66ac9dbSNicholas Bellinger } 205c66ac9dbSNicholas Bellinger 2060fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; 2070fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; 20870d3ae5cSAsias He 20970d3ae5cSAsias He /* 21070d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 21170d3ae5cSAsias He */ 21270d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 21370d3ae5cSAsias He /* 21470d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 21570d3ae5cSAsias He */ 21670d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 21770d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 21870d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 21970d3ae5cSAsias He 22070d3ae5cSAsias He /* 22170d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 22270d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 22370d3ae5cSAsias He */ 22470d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 225c66ac9dbSNicholas Bellinger } 226c66ac9dbSNicholas Bellinger 2270fd97ccfSChristoph Hellwig fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; 228c66ac9dbSNicholas Bellinger 2290fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 230c66ac9dbSNicholas Bellinger 231b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 232b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 233b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2340fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 235b32f4c7eSNicholas Bellinger } 236b32f4c7eSNicholas Bellinger 237c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 238c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 239c66ac9dbSNicholas Bellinger 2406708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 241c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 242c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 243c66ac9dbSNicholas Bellinger 2440fd97ccfSChristoph Hellwig return 0; 245c66ac9dbSNicholas Bellinger fail: 246c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 247c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 248c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 249c66ac9dbSNicholas Bellinger } 2500fd97ccfSChristoph Hellwig return ret; 251c66ac9dbSNicholas Bellinger } 252c66ac9dbSNicholas Bellinger 2530fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 254c66ac9dbSNicholas Bellinger { 2550fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 256c66ac9dbSNicholas Bellinger 257c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 258c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 259c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 260c66ac9dbSNicholas Bellinger } 261c66ac9dbSNicholas Bellinger 262c66ac9dbSNicholas Bellinger kfree(fd_dev); 263c66ac9dbSNicholas Bellinger } 264c66ac9dbSNicholas Bellinger 265778229afSSebastian Andrzej Siewior static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 266778229afSSebastian Andrzej Siewior u32 sgl_nents, int is_write) 267c66ac9dbSNicholas Bellinger { 2685787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 2690fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 2706708bb27SAndy Grover struct file *fd = dev->fd_file; 2715787cacdSChristoph Hellwig struct scatterlist *sg; 272c66ac9dbSNicholas Bellinger struct iovec *iov; 273c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 2740fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 275c66ac9dbSNicholas Bellinger int ret = 0, i; 276c66ac9dbSNicholas Bellinger 2775787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 2786708bb27SAndy Grover if (!iov) { 2796708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 280e3d6f909SAndy Grover return -ENOMEM; 281c66ac9dbSNicholas Bellinger } 282c66ac9dbSNicholas Bellinger 2835787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2849649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 28540ff2c3bSSebastian Andrzej Siewior iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 286c66ac9dbSNicholas Bellinger } 287c66ac9dbSNicholas Bellinger 288c66ac9dbSNicholas Bellinger old_fs = get_fs(); 289c66ac9dbSNicholas Bellinger set_fs(get_ds()); 290778229afSSebastian Andrzej Siewior 291778229afSSebastian Andrzej Siewior if (is_write) 292778229afSSebastian Andrzej Siewior ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 293778229afSSebastian Andrzej Siewior else 2945787cacdSChristoph Hellwig ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 295778229afSSebastian Andrzej Siewior 296c66ac9dbSNicholas Bellinger set_fs(old_fs); 297c66ac9dbSNicholas Bellinger 29840ff2c3bSSebastian Andrzej Siewior for_each_sg(sgl, sg, sgl_nents, i) 29940ff2c3bSSebastian Andrzej Siewior kunmap(sg_page(sg)); 300778229afSSebastian Andrzej Siewior 301c66ac9dbSNicholas Bellinger kfree(iov); 302778229afSSebastian Andrzej Siewior 303778229afSSebastian Andrzej Siewior if (is_write) { 304778229afSSebastian Andrzej Siewior if (ret < 0 || ret != cmd->data_length) { 305778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 306778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 307778229afSSebastian Andrzej Siewior } 308778229afSSebastian Andrzej Siewior } else { 309c66ac9dbSNicholas Bellinger /* 310c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 311c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 312c66ac9dbSNicholas Bellinger * block_device. 313c66ac9dbSNicholas Bellinger */ 314496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3155787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 316778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 317778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 318778229afSSebastian Andrzej Siewior cmd->data_length); 319e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 320c66ac9dbSNicholas Bellinger } 321c66ac9dbSNicholas Bellinger } else { 322c66ac9dbSNicholas Bellinger if (ret < 0) { 323778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 324778229afSSebastian Andrzej Siewior __func__, ret); 325e3d6f909SAndy Grover return ret; 326c66ac9dbSNicholas Bellinger } 327c66ac9dbSNicholas Bellinger } 328c66ac9dbSNicholas Bellinger } 329c66ac9dbSNicholas Bellinger return 1; 330c66ac9dbSNicholas Bellinger } 331c66ac9dbSNicholas Bellinger 332de103c93SChristoph Hellwig static sense_reason_t 333de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 334c66ac9dbSNicholas Bellinger { 335c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3360fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 337a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 338c66ac9dbSNicholas Bellinger loff_t start, end; 339c66ac9dbSNicholas Bellinger int ret; 340c66ac9dbSNicholas Bellinger 341c66ac9dbSNicholas Bellinger /* 342c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 343c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 344c66ac9dbSNicholas Bellinger */ 345c66ac9dbSNicholas Bellinger if (immed) 3465787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 347c66ac9dbSNicholas Bellinger 348c66ac9dbSNicholas Bellinger /* 349c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 350c66ac9dbSNicholas Bellinger */ 351a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 352c66ac9dbSNicholas Bellinger start = 0; 353c66ac9dbSNicholas Bellinger end = LLONG_MAX; 354c66ac9dbSNicholas Bellinger } else { 3550fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 356c66ac9dbSNicholas Bellinger if (cmd->data_length) 357c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 358c66ac9dbSNicholas Bellinger else 359c66ac9dbSNicholas Bellinger end = LLONG_MAX; 360c66ac9dbSNicholas Bellinger } 361c66ac9dbSNicholas Bellinger 362c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 363c66ac9dbSNicholas Bellinger if (ret != 0) 3646708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 365c66ac9dbSNicholas Bellinger 3665787cacdSChristoph Hellwig if (immed) 367ad67f0d9SChristoph Hellwig return 0; 3685787cacdSChristoph Hellwig 369de103c93SChristoph Hellwig if (ret) 3705787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 371de103c93SChristoph Hellwig else 3725787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 373ad67f0d9SChristoph Hellwig 374ad67f0d9SChristoph Hellwig return 0; 375c66ac9dbSNicholas Bellinger } 376c66ac9dbSNicholas Bellinger 3777b745c84SNicholas Bellinger static unsigned char * 3787b745c84SNicholas Bellinger fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 3797b745c84SNicholas Bellinger unsigned int len) 3807b745c84SNicholas Bellinger { 3817b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 3827b745c84SNicholas Bellinger unsigned int block_size = se_dev->dev_attrib.block_size; 3837b745c84SNicholas Bellinger unsigned int i = 0, end; 3847b745c84SNicholas Bellinger unsigned char *buf, *p, *kmap_buf; 3857b745c84SNicholas Bellinger 3867b745c84SNicholas Bellinger buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 3877b745c84SNicholas Bellinger if (!buf) { 3887b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same buf\n"); 3897b745c84SNicholas Bellinger return NULL; 3907b745c84SNicholas Bellinger } 3917b745c84SNicholas Bellinger 3927b745c84SNicholas Bellinger kmap_buf = kmap(sg_page(sg)) + sg->offset; 3937b745c84SNicholas Bellinger if (!kmap_buf) { 3947b745c84SNicholas Bellinger pr_err("kmap() failed in fd_setup_write_same\n"); 3957b745c84SNicholas Bellinger kfree(buf); 3967b745c84SNicholas Bellinger return NULL; 3977b745c84SNicholas Bellinger } 3987b745c84SNicholas Bellinger /* 3997b745c84SNicholas Bellinger * Fill local *buf to contain multiple WRITE_SAME blocks up to 4007b745c84SNicholas Bellinger * min(len, PAGE_SIZE) 4017b745c84SNicholas Bellinger */ 4027b745c84SNicholas Bellinger p = buf; 4037b745c84SNicholas Bellinger end = min_t(unsigned int, len, PAGE_SIZE); 4047b745c84SNicholas Bellinger 4057b745c84SNicholas Bellinger while (i < end) { 4067b745c84SNicholas Bellinger memcpy(p, kmap_buf, block_size); 4077b745c84SNicholas Bellinger 4087b745c84SNicholas Bellinger i += block_size; 4097b745c84SNicholas Bellinger p += block_size; 4107b745c84SNicholas Bellinger } 4117b745c84SNicholas Bellinger kunmap(sg_page(sg)); 4127b745c84SNicholas Bellinger 4137b745c84SNicholas Bellinger return buf; 4147b745c84SNicholas Bellinger } 4157b745c84SNicholas Bellinger 4167b745c84SNicholas Bellinger static sense_reason_t 4177b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 4187b745c84SNicholas Bellinger { 4197b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4207b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 4217b745c84SNicholas Bellinger struct file *f = fd_dev->fd_file; 4227b745c84SNicholas Bellinger struct scatterlist *sg; 4237b745c84SNicholas Bellinger struct iovec *iov; 4247b745c84SNicholas Bellinger mm_segment_t old_fs; 425972b29c8SRoland Dreier sector_t nolb = sbc_get_write_same_sectors(cmd); 4267b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 4277b745c84SNicholas Bellinger unsigned int len, len_tmp, iov_num; 4287b745c84SNicholas Bellinger int i, rc; 4297b745c84SNicholas Bellinger unsigned char *buf; 4307b745c84SNicholas Bellinger 4317b745c84SNicholas Bellinger if (!nolb) { 4327b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4337b745c84SNicholas Bellinger return 0; 4347b745c84SNicholas Bellinger } 4357b745c84SNicholas Bellinger sg = &cmd->t_data_sg[0]; 4367b745c84SNicholas Bellinger 4377b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 4387b745c84SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 4397b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 4407b745c84SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 4417b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 4427b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4437b745c84SNicholas Bellinger } 4447b745c84SNicholas Bellinger 4457b745c84SNicholas Bellinger len = len_tmp = nolb * se_dev->dev_attrib.block_size; 4467b745c84SNicholas Bellinger iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 4477b745c84SNicholas Bellinger 4487b745c84SNicholas Bellinger buf = fd_setup_write_same_buf(cmd, sg, len); 4497b745c84SNicholas Bellinger if (!buf) 4507b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4517b745c84SNicholas Bellinger 4527b745c84SNicholas Bellinger iov = vzalloc(sizeof(struct iovec) * iov_num); 4537b745c84SNicholas Bellinger if (!iov) { 4547b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 4557b745c84SNicholas Bellinger kfree(buf); 4567b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4577b745c84SNicholas Bellinger } 4587b745c84SNicholas Bellinger /* 4597b745c84SNicholas Bellinger * Map the single fabric received scatterlist block now populated 4607b745c84SNicholas Bellinger * in *buf into each iovec for I/O submission. 4617b745c84SNicholas Bellinger */ 4627b745c84SNicholas Bellinger for (i = 0; i < iov_num; i++) { 4637b745c84SNicholas Bellinger iov[i].iov_base = buf; 4647b745c84SNicholas Bellinger iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 4657b745c84SNicholas Bellinger len_tmp -= iov[i].iov_len; 4667b745c84SNicholas Bellinger } 4677b745c84SNicholas Bellinger 4687b745c84SNicholas Bellinger old_fs = get_fs(); 4697b745c84SNicholas Bellinger set_fs(get_ds()); 4707b745c84SNicholas Bellinger rc = vfs_writev(f, &iov[0], iov_num, &pos); 4717b745c84SNicholas Bellinger set_fs(old_fs); 4727b745c84SNicholas Bellinger 4737b745c84SNicholas Bellinger vfree(iov); 4747b745c84SNicholas Bellinger kfree(buf); 4757b745c84SNicholas Bellinger 4767b745c84SNicholas Bellinger if (rc < 0 || rc != len) { 4777b745c84SNicholas Bellinger pr_err("vfs_writev() returned %d for write same\n", rc); 4787b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4797b745c84SNicholas Bellinger } 4807b745c84SNicholas Bellinger 4817b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4827b745c84SNicholas Bellinger return 0; 4837b745c84SNicholas Bellinger } 4847b745c84SNicholas Bellinger 485de103c93SChristoph Hellwig static sense_reason_t 48686d71829SAsias He fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 48770d3ae5cSAsias He { 48886d71829SAsias He struct file *file = priv; 48970d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 49070d3ae5cSAsias He int ret; 49170d3ae5cSAsias He 49270d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 49370d3ae5cSAsias He /* The backend is block device, use discard */ 49470d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 49570d3ae5cSAsias He 49643f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 49770d3ae5cSAsias He nolb, GFP_KERNEL, 0); 49870d3ae5cSAsias He if (ret < 0) { 49970d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 50070d3ae5cSAsias He ret); 50170d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50270d3ae5cSAsias He } 50370d3ae5cSAsias He } else { 50470d3ae5cSAsias He /* The backend is normal file, use fallocate */ 50543f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 50643f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 50770d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 50870d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 50970d3ae5cSAsias He 51070d3ae5cSAsias He if (!file->f_op->fallocate) 51170d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51270d3ae5cSAsias He 51370d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 51470d3ae5cSAsias He if (ret < 0) { 51570d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 51670d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51770d3ae5cSAsias He } 51870d3ae5cSAsias He } 51970d3ae5cSAsias He 52043f55bbbSAsias He return 0; 52143f55bbbSAsias He } 52243f55bbbSAsias He 52343f55bbbSAsias He static sense_reason_t 52443f55bbbSAsias He fd_execute_write_same_unmap(struct se_cmd *cmd) 52543f55bbbSAsias He { 52643f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 52743f55bbbSAsias He struct fd_dev *fd_dev = FD_DEV(se_dev); 52843f55bbbSAsias He struct file *file = fd_dev->fd_file; 52943f55bbbSAsias He sector_t lba = cmd->t_task_lba; 53043f55bbbSAsias He sector_t nolb = sbc_get_write_same_sectors(cmd); 53143f55bbbSAsias He int ret; 53243f55bbbSAsias He 53343f55bbbSAsias He if (!nolb) { 53443f55bbbSAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 53543f55bbbSAsias He return 0; 53643f55bbbSAsias He } 53743f55bbbSAsias He 53843f55bbbSAsias He ret = fd_do_unmap(cmd, file, lba, nolb); 53943f55bbbSAsias He if (ret) 54043f55bbbSAsias He return ret; 54143f55bbbSAsias He 54270d3ae5cSAsias He target_complete_cmd(cmd, GOOD); 54370d3ae5cSAsias He return 0; 54470d3ae5cSAsias He } 54570d3ae5cSAsias He 54670d3ae5cSAsias He static sense_reason_t 54750642762SAsias He fd_execute_unmap(struct se_cmd *cmd) 54850642762SAsias He { 54986d71829SAsias He struct file *file = FD_DEV(cmd->se_dev)->fd_file; 55050642762SAsias He 55186d71829SAsias He return sbc_execute_unmap(cmd, fd_do_unmap, file); 55250642762SAsias He } 55350642762SAsias He 55450642762SAsias He static sense_reason_t 555de103c93SChristoph Hellwig fd_execute_rw(struct se_cmd *cmd) 556c66ac9dbSNicholas Bellinger { 5570c2ad7d1SChristoph Hellwig struct scatterlist *sgl = cmd->t_data_sg; 5580c2ad7d1SChristoph Hellwig u32 sgl_nents = cmd->t_data_nents; 5590c2ad7d1SChristoph Hellwig enum dma_data_direction data_direction = cmd->data_direction; 560c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 561c66ac9dbSNicholas Bellinger int ret = 0; 562c66ac9dbSNicholas Bellinger 563c66ac9dbSNicholas Bellinger /* 564c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 565c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 566c66ac9dbSNicholas Bellinger */ 5675787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 568778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 569c66ac9dbSNicholas Bellinger } else { 570778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 571a4dff304SNicholas Bellinger /* 572a4dff304SNicholas Bellinger * Perform implict vfs_fsync_range() for fd_do_writev() ops 573a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 574a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 575a4dff304SNicholas Bellinger */ 576c66ac9dbSNicholas Bellinger if (ret > 0 && 5770fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_fua_write > 0 && 5782d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 5790fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 580a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 5810fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 582a4dff304SNicholas Bellinger loff_t end = start + cmd->data_length; 583c66ac9dbSNicholas Bellinger 584a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 585a4dff304SNicholas Bellinger } 586c66ac9dbSNicholas Bellinger } 587c66ac9dbSNicholas Bellinger 588de103c93SChristoph Hellwig if (ret < 0) 589de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 590de103c93SChristoph Hellwig 5915787cacdSChristoph Hellwig if (ret) 5925787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 59303e98c9eSNicholas Bellinger return 0; 594c66ac9dbSNicholas Bellinger } 595c66ac9dbSNicholas Bellinger 596c66ac9dbSNicholas Bellinger enum { 597c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 598c66ac9dbSNicholas Bellinger }; 599c66ac9dbSNicholas Bellinger 600c66ac9dbSNicholas Bellinger static match_table_t tokens = { 601c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 602c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 603b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 604c66ac9dbSNicholas Bellinger {Opt_err, NULL} 605c66ac9dbSNicholas Bellinger }; 606c66ac9dbSNicholas Bellinger 6070fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 608c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 609c66ac9dbSNicholas Bellinger { 6100fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 611c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 612c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 613b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 614c66ac9dbSNicholas Bellinger 615c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 616c66ac9dbSNicholas Bellinger if (!opts) 617c66ac9dbSNicholas Bellinger return -ENOMEM; 618c66ac9dbSNicholas Bellinger 619c66ac9dbSNicholas Bellinger orig = opts; 620c66ac9dbSNicholas Bellinger 62190c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 622c66ac9dbSNicholas Bellinger if (!*ptr) 623c66ac9dbSNicholas Bellinger continue; 624c66ac9dbSNicholas Bellinger 625c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 626c66ac9dbSNicholas Bellinger switch (token) { 627c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 628dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 629dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 630dbc6e022SAl Viro ret = -EINVAL; 6316d180253SJesper Juhl break; 6326d180253SJesper Juhl } 6336708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 634c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 635c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 636c66ac9dbSNicholas Bellinger break; 637c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 638c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 6396d180253SJesper Juhl if (!arg_p) { 6406d180253SJesper Juhl ret = -ENOMEM; 6416d180253SJesper Juhl break; 6426d180253SJesper Juhl } 643c66ac9dbSNicholas Bellinger ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); 6446d180253SJesper Juhl kfree(arg_p); 645c66ac9dbSNicholas Bellinger if (ret < 0) { 6466708bb27SAndy Grover pr_err("strict_strtoull() failed for" 647c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 648c66ac9dbSNicholas Bellinger goto out; 649c66ac9dbSNicholas Bellinger } 6506708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 651c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 652c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 653c66ac9dbSNicholas Bellinger break; 654b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 655b32f4c7eSNicholas Bellinger match_int(args, &arg); 656b32f4c7eSNicholas Bellinger if (arg != 1) { 657b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 658b32f4c7eSNicholas Bellinger ret = -EINVAL; 659b32f4c7eSNicholas Bellinger goto out; 660b32f4c7eSNicholas Bellinger } 661b32f4c7eSNicholas Bellinger 662b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 663b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 664b32f4c7eSNicholas Bellinger 665b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 666b32f4c7eSNicholas Bellinger break; 667c66ac9dbSNicholas Bellinger default: 668c66ac9dbSNicholas Bellinger break; 669c66ac9dbSNicholas Bellinger } 670c66ac9dbSNicholas Bellinger } 671c66ac9dbSNicholas Bellinger 672c66ac9dbSNicholas Bellinger out: 673c66ac9dbSNicholas Bellinger kfree(orig); 674c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 675c66ac9dbSNicholas Bellinger } 676c66ac9dbSNicholas Bellinger 6770fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 678c66ac9dbSNicholas Bellinger { 6790fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 680c66ac9dbSNicholas Bellinger ssize_t bl = 0; 681c66ac9dbSNicholas Bellinger 682c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 683b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 684b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 685b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 686b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 687c66ac9dbSNicholas Bellinger return bl; 688c66ac9dbSNicholas Bellinger } 689c66ac9dbSNicholas Bellinger 690c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 691c66ac9dbSNicholas Bellinger { 6920fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 693cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 694cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 695cd9323fdSNicholas Bellinger unsigned long long dev_size; 696cd9323fdSNicholas Bellinger /* 697cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 698cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 699cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 700cd9323fdSNicholas Bellinger */ 701cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 702cd9323fdSNicholas Bellinger dev_size = (i_size_read(i) - fd_dev->fd_block_size); 703cd9323fdSNicholas Bellinger else 704cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 705c66ac9dbSNicholas Bellinger 7060fd97ccfSChristoph Hellwig return div_u64(dev_size, dev->dev_attrib.block_size); 707c66ac9dbSNicholas Bellinger } 708c66ac9dbSNicholas Bellinger 7099e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 7100c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 711ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 7127b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 71370d3ae5cSAsias He .execute_write_same_unmap = fd_execute_write_same_unmap, 71450642762SAsias He .execute_unmap = fd_execute_unmap, 7150c2ad7d1SChristoph Hellwig }; 7160c2ad7d1SChristoph Hellwig 717de103c93SChristoph Hellwig static sense_reason_t 718de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 7190c2ad7d1SChristoph Hellwig { 7209e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 7210c2ad7d1SChristoph Hellwig } 7220c2ad7d1SChristoph Hellwig 723c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 724c66ac9dbSNicholas Bellinger .name = "fileio", 7250fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 7260fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 727c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 728c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 729c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 730c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 7310fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 7320fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 733c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 7340c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 735c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 736c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 7376f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 738c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 739c66ac9dbSNicholas Bellinger }; 740c66ac9dbSNicholas Bellinger 741c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 742c66ac9dbSNicholas Bellinger { 743c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 744c66ac9dbSNicholas Bellinger } 745c66ac9dbSNicholas Bellinger 74663b91d5aSAsias He static void __exit fileio_module_exit(void) 747c66ac9dbSNicholas Bellinger { 748c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 749c66ac9dbSNicholas Bellinger } 750c66ac9dbSNicholas Bellinger 751c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 752c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 753c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 754c66ac9dbSNicholas Bellinger 755c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 756c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 757