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 * 64c76251eSNicholas Bellinger * (c) Copyright 2005-2013 Datera, Inc. 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 static int fd_attach_hba(struct se_hba *hba, u32 host_id) 49c66ac9dbSNicholas Bellinger { 50c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 51c66ac9dbSNicholas Bellinger 52c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 536708bb27SAndy Grover if (!fd_host) { 546708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 55e3d6f909SAndy Grover return -ENOMEM; 56c66ac9dbSNicholas Bellinger } 57c66ac9dbSNicholas Bellinger 58c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 59c66ac9dbSNicholas Bellinger 60e3d6f909SAndy Grover hba->hba_ptr = fd_host; 61c66ac9dbSNicholas Bellinger 626708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 63c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 64c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 6595cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 6695cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id); 67c66ac9dbSNicholas Bellinger 68c66ac9dbSNicholas Bellinger return 0; 69c66ac9dbSNicholas Bellinger } 70c66ac9dbSNicholas Bellinger 71c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 72c66ac9dbSNicholas Bellinger { 73c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 74c66ac9dbSNicholas Bellinger 756708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 76c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 77c66ac9dbSNicholas Bellinger 78c66ac9dbSNicholas Bellinger kfree(fd_host); 79c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 80c66ac9dbSNicholas Bellinger } 81c66ac9dbSNicholas Bellinger 820fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 83c66ac9dbSNicholas Bellinger { 84c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 858359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 86c66ac9dbSNicholas Bellinger 87c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 886708bb27SAndy Grover if (!fd_dev) { 896708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 90c66ac9dbSNicholas Bellinger return NULL; 91c66ac9dbSNicholas Bellinger } 92c66ac9dbSNicholas Bellinger 93c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 94c66ac9dbSNicholas Bellinger 956708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 96c66ac9dbSNicholas Bellinger 970fd97ccfSChristoph Hellwig return &fd_dev->dev; 98c66ac9dbSNicholas Bellinger } 99c66ac9dbSNicholas Bellinger 1000fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 101c66ac9dbSNicholas Bellinger { 1020fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1030fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 104c66ac9dbSNicholas Bellinger struct file *file; 105c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1060fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 107c66ac9dbSNicholas Bellinger 1080fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1090fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1100fd97ccfSChristoph Hellwig return -EINVAL; 1110fd97ccfSChristoph Hellwig } 112c66ac9dbSNicholas Bellinger 113c66ac9dbSNicholas Bellinger /* 114a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 115a4dff304SNicholas Bellinger * of pure timestamp updates. 116c66ac9dbSNicholas Bellinger */ 117a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1180fd97ccfSChristoph Hellwig 119b32f4c7eSNicholas Bellinger /* 120b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 121b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 122b32f4c7eSNicholas Bellinger * 123b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 124b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 125b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 126b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 127b32f4c7eSNicholas Bellinger */ 128b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 129b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 130b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 131b32f4c7eSNicholas Bellinger } 132c66ac9dbSNicholas Bellinger 133dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 134613640e4SNicholas Bellinger if (IS_ERR(file)) { 135dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 136613640e4SNicholas Bellinger ret = PTR_ERR(file); 137613640e4SNicholas Bellinger goto fail; 138613640e4SNicholas Bellinger } 139c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 140c66ac9dbSNicholas Bellinger /* 141c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 142c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 143c66ac9dbSNicholas Bellinger * 144c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 145c66ac9dbSNicholas Bellinger */ 146c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 147c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1480fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 149cd9323fdSNicholas Bellinger unsigned long long dev_size; 1500fd97ccfSChristoph Hellwig 15121363ca8SNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 152c66ac9dbSNicholas Bellinger /* 153c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 154c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 155c66ac9dbSNicholas Bellinger */ 156cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 157c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 158c66ac9dbSNicholas Bellinger 1596708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 160c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 161cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 162c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 16370d3ae5cSAsias He /* 16470d3ae5cSAsias He * Check if the underlying struct block_device request_queue supports 16570d3ae5cSAsias He * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 16670d3ae5cSAsias He * in ATA and we need to set TPE=1 16770d3ae5cSAsias He */ 16870d3ae5cSAsias He if (blk_queue_discard(q)) { 16970d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 17070d3ae5cSAsias He q->limits.max_discard_sectors; 17170d3ae5cSAsias He /* 17270d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 17370d3ae5cSAsias He */ 17470d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 17570d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 17670d3ae5cSAsias He q->limits.discard_granularity >> 9; 17770d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 17870d3ae5cSAsias He q->limits.discard_alignment; 17970d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 18070d3ae5cSAsias He " disabled by default\n"); 18170d3ae5cSAsias He } 18270d3ae5cSAsias He /* 18370d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 18470d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 18570d3ae5cSAsias He */ 18670d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1870463a3feSAsias He 1880463a3feSAsias He if (blk_queue_nonrot(q)) 1890463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 190c66ac9dbSNicholas Bellinger } else { 191c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1926708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 193c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 194c66ac9dbSNicholas Bellinger " block_device\n"); 195c66ac9dbSNicholas Bellinger goto fail; 196c66ac9dbSNicholas Bellinger } 197c66ac9dbSNicholas Bellinger 19821363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 19970d3ae5cSAsias He /* 20070d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 20170d3ae5cSAsias He */ 20270d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 20370d3ae5cSAsias He /* 20470d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 20570d3ae5cSAsias He */ 20670d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 20770d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 20870d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 20970d3ae5cSAsias He 21070d3ae5cSAsias He /* 21170d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 21270d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 21370d3ae5cSAsias He */ 21470d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 215c66ac9dbSNicholas Bellinger } 216c66ac9dbSNicholas Bellinger 21721363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 21895cadaceSNicholas Bellinger dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 21995cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 2200fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 221c66ac9dbSNicholas Bellinger 222b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 223b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 224b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2250fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 226b32f4c7eSNicholas Bellinger } 227b32f4c7eSNicholas Bellinger 228c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 229c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 230c66ac9dbSNicholas Bellinger 2316708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 232c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 233c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 234c66ac9dbSNicholas Bellinger 2350fd97ccfSChristoph Hellwig return 0; 236c66ac9dbSNicholas Bellinger fail: 237c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 238c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 239c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 240c66ac9dbSNicholas Bellinger } 2410fd97ccfSChristoph Hellwig return ret; 242c66ac9dbSNicholas Bellinger } 243c66ac9dbSNicholas Bellinger 2440fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 245c66ac9dbSNicholas Bellinger { 2460fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 247c66ac9dbSNicholas Bellinger 248c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 249c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 250c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 251c66ac9dbSNicholas Bellinger } 252c66ac9dbSNicholas Bellinger 253c66ac9dbSNicholas Bellinger kfree(fd_dev); 254c66ac9dbSNicholas Bellinger } 255c66ac9dbSNicholas Bellinger 2568287fa5fSSagi Grimberg static int fd_do_rw(struct se_cmd *cmd, struct file *fd, 2578287fa5fSSagi Grimberg u32 block_size, struct scatterlist *sgl, 2588287fa5fSSagi Grimberg u32 sgl_nents, u32 data_length, int is_write) 25942201b55SNicholas Bellinger { 2605787cacdSChristoph Hellwig struct scatterlist *sg; 2616b9a44d0SChristoph Hellwig struct iov_iter iter; 2626b9a44d0SChristoph Hellwig struct bio_vec *bvec; 2636b9a44d0SChristoph Hellwig ssize_t len = 0; 2648287fa5fSSagi Grimberg loff_t pos = (cmd->t_task_lba * block_size); 265c66ac9dbSNicholas Bellinger int ret = 0, i; 266c66ac9dbSNicholas Bellinger 2676b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 2686b9a44d0SChristoph Hellwig if (!bvec) { 2696708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 270e3d6f909SAndy Grover return -ENOMEM; 271c66ac9dbSNicholas Bellinger } 272c66ac9dbSNicholas Bellinger 2735787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2746b9a44d0SChristoph Hellwig bvec[i].bv_page = sg_page(sg); 2756b9a44d0SChristoph Hellwig bvec[i].bv_len = sg->length; 2766b9a44d0SChristoph Hellwig bvec[i].bv_offset = sg->offset; 2776b9a44d0SChristoph Hellwig 2786b9a44d0SChristoph Hellwig len += sg->length; 279c66ac9dbSNicholas Bellinger } 280c66ac9dbSNicholas Bellinger 2816b9a44d0SChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len); 282778229afSSebastian Andrzej Siewior if (is_write) 2836b9a44d0SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos); 284778229afSSebastian Andrzej Siewior else 2856b9a44d0SChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos); 286778229afSSebastian Andrzej Siewior 2876b9a44d0SChristoph Hellwig kfree(bvec); 288778229afSSebastian Andrzej Siewior 289778229afSSebastian Andrzej Siewior if (is_write) { 2908287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 291778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 292778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 293778229afSSebastian Andrzej Siewior } 294778229afSSebastian Andrzej Siewior } else { 295c66ac9dbSNicholas Bellinger /* 296c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 297c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 298c66ac9dbSNicholas Bellinger * block_device. 299c66ac9dbSNicholas Bellinger */ 300496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3018287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 302778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 303778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 3048287fa5fSSagi Grimberg data_length); 305e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 306c66ac9dbSNicholas Bellinger } 307c66ac9dbSNicholas Bellinger } else { 308c66ac9dbSNicholas Bellinger if (ret < 0) { 309778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 310778229afSSebastian Andrzej Siewior __func__, ret); 311e3d6f909SAndy Grover return ret; 312c66ac9dbSNicholas Bellinger } 313c66ac9dbSNicholas Bellinger } 314c66ac9dbSNicholas Bellinger } 315c66ac9dbSNicholas Bellinger return 1; 316c66ac9dbSNicholas Bellinger } 317c66ac9dbSNicholas Bellinger 318de103c93SChristoph Hellwig static sense_reason_t 319de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 320c66ac9dbSNicholas Bellinger { 321c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3220fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 323a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 324c66ac9dbSNicholas Bellinger loff_t start, end; 325c66ac9dbSNicholas Bellinger int ret; 326c66ac9dbSNicholas Bellinger 327c66ac9dbSNicholas Bellinger /* 328c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 329c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 330c66ac9dbSNicholas Bellinger */ 331c66ac9dbSNicholas Bellinger if (immed) 3325787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 333c66ac9dbSNicholas Bellinger 334c66ac9dbSNicholas Bellinger /* 335c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 336c66ac9dbSNicholas Bellinger */ 337a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 338c66ac9dbSNicholas Bellinger start = 0; 339c66ac9dbSNicholas Bellinger end = LLONG_MAX; 340c66ac9dbSNicholas Bellinger } else { 3410fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 342c66ac9dbSNicholas Bellinger if (cmd->data_length) 34362d3ab49SZach Brown end = start + cmd->data_length - 1; 344c66ac9dbSNicholas Bellinger else 345c66ac9dbSNicholas Bellinger end = LLONG_MAX; 346c66ac9dbSNicholas Bellinger } 347c66ac9dbSNicholas Bellinger 348c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 349c66ac9dbSNicholas Bellinger if (ret != 0) 3506708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 351c66ac9dbSNicholas Bellinger 3525787cacdSChristoph Hellwig if (immed) 353ad67f0d9SChristoph Hellwig return 0; 3545787cacdSChristoph Hellwig 355de103c93SChristoph Hellwig if (ret) 3565787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 357de103c93SChristoph Hellwig else 3585787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 359ad67f0d9SChristoph Hellwig 360ad67f0d9SChristoph Hellwig return 0; 361c66ac9dbSNicholas Bellinger } 362c66ac9dbSNicholas Bellinger 3637b745c84SNicholas Bellinger static sense_reason_t 3647b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 3657b745c84SNicholas Bellinger { 3667b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 3677b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 3687b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 369d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 370d4c5dcacSChristoph Hellwig struct iov_iter iter; 371d4c5dcacSChristoph Hellwig struct bio_vec *bvec; 372d4c5dcacSChristoph Hellwig unsigned int len = 0, i; 373d4c5dcacSChristoph Hellwig ssize_t ret; 3747b745c84SNicholas Bellinger 3757b745c84SNicholas Bellinger if (!nolb) { 3767b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 3777b745c84SNicholas Bellinger return 0; 3787b745c84SNicholas Bellinger } 379afd73f1bSNicholas Bellinger if (cmd->prot_op) { 380afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO" 381afd73f1bSNicholas Bellinger " backends not supported\n"); 382afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 383afd73f1bSNicholas Bellinger } 3847b745c84SNicholas Bellinger 3857b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 386d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 3877b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 388d4c5dcacSChristoph Hellwig " block_size: %u\n", 389d4c5dcacSChristoph Hellwig cmd->t_data_nents, 390d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length, 3917b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 3927b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 3937b745c84SNicholas Bellinger } 3947b745c84SNicholas Bellinger 395d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 396d4c5dcacSChristoph Hellwig if (!bvec) 3977b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3987b745c84SNicholas Bellinger 399d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) { 400d4c5dcacSChristoph Hellwig bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 401d4c5dcacSChristoph Hellwig bvec[i].bv_len = cmd->t_data_sg[0].length; 402d4c5dcacSChristoph Hellwig bvec[i].bv_offset = cmd->t_data_sg[0].offset; 403d4c5dcacSChristoph Hellwig 404d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size; 4057b745c84SNicholas Bellinger } 4067b745c84SNicholas Bellinger 407d4c5dcacSChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len); 408d4c5dcacSChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos); 4097b745c84SNicholas Bellinger 410d4c5dcacSChristoph Hellwig kfree(bvec); 411d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) { 412d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret); 4137b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4147b745c84SNicholas Bellinger } 4157b745c84SNicholas Bellinger 4167b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4177b745c84SNicholas Bellinger return 0; 4187b745c84SNicholas Bellinger } 4197b745c84SNicholas Bellinger 42064d240b7SAkinobu Mita static int 42164d240b7SAkinobu Mita fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, 42264d240b7SAkinobu Mita void *buf, size_t bufsize) 42364d240b7SAkinobu Mita { 42464d240b7SAkinobu Mita struct fd_dev *fd_dev = FD_DEV(se_dev); 42564d240b7SAkinobu Mita struct file *prot_fd = fd_dev->fd_prot_file; 42664d240b7SAkinobu Mita sector_t prot_length, prot; 42764d240b7SAkinobu Mita loff_t pos = lba * se_dev->prot_length; 42864d240b7SAkinobu Mita 42964d240b7SAkinobu Mita if (!prot_fd) { 43064d240b7SAkinobu Mita pr_err("Unable to locate fd_dev->fd_prot_file\n"); 43164d240b7SAkinobu Mita return -ENODEV; 43264d240b7SAkinobu Mita } 43364d240b7SAkinobu Mita 43464d240b7SAkinobu Mita prot_length = nolb * se_dev->prot_length; 43564d240b7SAkinobu Mita 43664d240b7SAkinobu Mita for (prot = 0; prot < prot_length;) { 43764d240b7SAkinobu Mita sector_t len = min_t(sector_t, bufsize, prot_length - prot); 43864d240b7SAkinobu Mita ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot); 43964d240b7SAkinobu Mita 44064d240b7SAkinobu Mita if (ret != len) { 44164d240b7SAkinobu Mita pr_err("vfs_write to prot file failed: %zd\n", ret); 44264d240b7SAkinobu Mita return ret < 0 ? ret : -ENODEV; 44364d240b7SAkinobu Mita } 44464d240b7SAkinobu Mita prot += ret; 44564d240b7SAkinobu Mita } 44664d240b7SAkinobu Mita 44764d240b7SAkinobu Mita return 0; 44864d240b7SAkinobu Mita } 44964d240b7SAkinobu Mita 45064d240b7SAkinobu Mita static int 45164d240b7SAkinobu Mita fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 45264d240b7SAkinobu Mita { 45364d240b7SAkinobu Mita void *buf; 45464d240b7SAkinobu Mita int rc; 45564d240b7SAkinobu Mita 45664d240b7SAkinobu Mita buf = (void *)__get_free_page(GFP_KERNEL); 45764d240b7SAkinobu Mita if (!buf) { 45864d240b7SAkinobu Mita pr_err("Unable to allocate FILEIO prot buf\n"); 45964d240b7SAkinobu Mita return -ENOMEM; 46064d240b7SAkinobu Mita } 46164d240b7SAkinobu Mita memset(buf, 0xff, PAGE_SIZE); 46264d240b7SAkinobu Mita 46364d240b7SAkinobu Mita rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); 46464d240b7SAkinobu Mita 46564d240b7SAkinobu Mita free_page((unsigned long)buf); 46664d240b7SAkinobu Mita 46764d240b7SAkinobu Mita return rc; 46864d240b7SAkinobu Mita } 46964d240b7SAkinobu Mita 470de103c93SChristoph Hellwig static sense_reason_t 47186d71829SAsias He fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 47270d3ae5cSAsias He { 47386d71829SAsias He struct file *file = priv; 47470d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 47570d3ae5cSAsias He int ret; 47670d3ae5cSAsias He 47764d240b7SAkinobu Mita if (cmd->se_dev->dev_attrib.pi_prot_type) { 47864d240b7SAkinobu Mita ret = fd_do_prot_unmap(cmd, lba, nolb); 47964d240b7SAkinobu Mita if (ret) 48064d240b7SAkinobu Mita return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 48164d240b7SAkinobu Mita } 48264d240b7SAkinobu Mita 48370d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 48470d3ae5cSAsias He /* The backend is block device, use discard */ 48570d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 48670d3ae5cSAsias He 48743f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 48870d3ae5cSAsias He nolb, GFP_KERNEL, 0); 48970d3ae5cSAsias He if (ret < 0) { 49070d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 49170d3ae5cSAsias He ret); 49270d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 49370d3ae5cSAsias He } 49470d3ae5cSAsias He } else { 49570d3ae5cSAsias He /* The backend is normal file, use fallocate */ 49643f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 49743f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 49870d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 49970d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 50070d3ae5cSAsias He 50170d3ae5cSAsias He if (!file->f_op->fallocate) 50270d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50370d3ae5cSAsias He 50470d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 50570d3ae5cSAsias He if (ret < 0) { 50670d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 50770d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50870d3ae5cSAsias He } 50970d3ae5cSAsias He } 51070d3ae5cSAsias He 51143f55bbbSAsias He return 0; 51243f55bbbSAsias He } 51343f55bbbSAsias He 51443f55bbbSAsias He static sense_reason_t 51543f55bbbSAsias He fd_execute_write_same_unmap(struct se_cmd *cmd) 51643f55bbbSAsias He { 51743f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 51843f55bbbSAsias He struct fd_dev *fd_dev = FD_DEV(se_dev); 51943f55bbbSAsias He struct file *file = fd_dev->fd_file; 52043f55bbbSAsias He sector_t lba = cmd->t_task_lba; 52143f55bbbSAsias He sector_t nolb = sbc_get_write_same_sectors(cmd); 5223abff1e5SChristoph Hellwig sense_reason_t ret; 52343f55bbbSAsias He 52443f55bbbSAsias He if (!nolb) { 52543f55bbbSAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 52643f55bbbSAsias He return 0; 52743f55bbbSAsias He } 52843f55bbbSAsias He 52943f55bbbSAsias He ret = fd_do_unmap(cmd, file, lba, nolb); 53043f55bbbSAsias He if (ret) 53143f55bbbSAsias He return ret; 53243f55bbbSAsias He 53370d3ae5cSAsias He target_complete_cmd(cmd, GOOD); 53470d3ae5cSAsias He return 0; 53570d3ae5cSAsias He } 53670d3ae5cSAsias He 53770d3ae5cSAsias He static sense_reason_t 53850642762SAsias He fd_execute_unmap(struct se_cmd *cmd) 53950642762SAsias He { 54086d71829SAsias He struct file *file = FD_DEV(cmd->se_dev)->fd_file; 54150642762SAsias He 54286d71829SAsias He return sbc_execute_unmap(cmd, fd_do_unmap, file); 54350642762SAsias He } 54450642762SAsias He 54550642762SAsias He static sense_reason_t 546a82a9538SNicholas Bellinger fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 547a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 548c66ac9dbSNicholas Bellinger { 549c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 5508287fa5fSSagi Grimberg struct fd_dev *fd_dev = FD_DEV(dev); 5518287fa5fSSagi Grimberg struct file *file = fd_dev->fd_file; 5528287fa5fSSagi Grimberg struct file *pfile = fd_dev->fd_prot_file; 55342201b55SNicholas Bellinger sense_reason_t rc; 554c66ac9dbSNicholas Bellinger int ret = 0; 555046ba642SNicholas Bellinger /* 556046ba642SNicholas Bellinger * We are currently limited by the number of iovecs (2048) per 557046ba642SNicholas Bellinger * single vfs_[writev,readv] call. 558046ba642SNicholas Bellinger */ 559046ba642SNicholas Bellinger if (cmd->data_length > FD_MAX_BYTES) { 560046ba642SNicholas Bellinger pr_err("FILEIO: Not able to process I/O of %u bytes due to" 561046ba642SNicholas Bellinger "FD_MAX_BYTES: %u iovec count limitiation\n", 562046ba642SNicholas Bellinger cmd->data_length, FD_MAX_BYTES); 563046ba642SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 564046ba642SNicholas Bellinger } 565c66ac9dbSNicholas Bellinger /* 566c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 567c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 568c66ac9dbSNicholas Bellinger */ 5695787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 570ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5718287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 5728287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 5738287fa5fSSagi Grimberg cmd->prot_length, 0); 57442201b55SNicholas Bellinger if (ret < 0) 57542201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57642201b55SNicholas Bellinger } 57742201b55SNicholas Bellinger 5788287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 5798287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 0); 58042201b55SNicholas Bellinger 581ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5828287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5838287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 58442201b55SNicholas Bellinger 585f75b6faeSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 586f75b6faeSSagi Grimberg 0, cmd->t_prot_sg, 0); 5878287fa5fSSagi Grimberg if (rc) 58842201b55SNicholas Bellinger return rc; 58942201b55SNicholas Bellinger } 5908287fa5fSSagi Grimberg } else { 5918287fa5fSSagi Grimberg if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5928287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5938287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 5948287fa5fSSagi Grimberg 5958287fa5fSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 5968287fa5fSSagi Grimberg 0, cmd->t_prot_sg, 0); 5978287fa5fSSagi Grimberg if (rc) 5988287fa5fSSagi Grimberg return rc; 59942201b55SNicholas Bellinger } 60042201b55SNicholas Bellinger 6018287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 6028287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 1); 603a4dff304SNicholas Bellinger /* 604125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 605a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 606a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 607a4dff304SNicholas Bellinger */ 608814e5b45SChristoph Hellwig if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { 609a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 6100fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 61162d3ab49SZach Brown loff_t end; 61262d3ab49SZach Brown 61362d3ab49SZach Brown if (cmd->data_length) 61462d3ab49SZach Brown end = start + cmd->data_length - 1; 61562d3ab49SZach Brown else 61662d3ab49SZach Brown end = LLONG_MAX; 617c66ac9dbSNicholas Bellinger 618a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 619a4dff304SNicholas Bellinger } 620c66ac9dbSNicholas Bellinger 621ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 6228287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 6238287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 6248287fa5fSSagi Grimberg cmd->prot_length, 1); 625de103c93SChristoph Hellwig if (ret < 0) 626de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 62742201b55SNicholas Bellinger } 62842201b55SNicholas Bellinger } 62942201b55SNicholas Bellinger 6308287fa5fSSagi Grimberg if (ret < 0) 63142201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 632de103c93SChristoph Hellwig 6335787cacdSChristoph Hellwig if (ret) 6345787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 63503e98c9eSNicholas Bellinger return 0; 636c66ac9dbSNicholas Bellinger } 637c66ac9dbSNicholas Bellinger 638c66ac9dbSNicholas Bellinger enum { 639c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 640c66ac9dbSNicholas Bellinger }; 641c66ac9dbSNicholas Bellinger 642c66ac9dbSNicholas Bellinger static match_table_t tokens = { 643c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 644c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 645b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 646c66ac9dbSNicholas Bellinger {Opt_err, NULL} 647c66ac9dbSNicholas Bellinger }; 648c66ac9dbSNicholas Bellinger 6490fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 650c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 651c66ac9dbSNicholas Bellinger { 6520fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 653c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 654c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 655b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 656c66ac9dbSNicholas Bellinger 657c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 658c66ac9dbSNicholas Bellinger if (!opts) 659c66ac9dbSNicholas Bellinger return -ENOMEM; 660c66ac9dbSNicholas Bellinger 661c66ac9dbSNicholas Bellinger orig = opts; 662c66ac9dbSNicholas Bellinger 66390c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 664c66ac9dbSNicholas Bellinger if (!*ptr) 665c66ac9dbSNicholas Bellinger continue; 666c66ac9dbSNicholas Bellinger 667c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 668c66ac9dbSNicholas Bellinger switch (token) { 669c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 670dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 671dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 672dbc6e022SAl Viro ret = -EINVAL; 6736d180253SJesper Juhl break; 6746d180253SJesper Juhl } 6756708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 676c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 677c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 678c66ac9dbSNicholas Bellinger break; 679c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 680c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 6816d180253SJesper Juhl if (!arg_p) { 6826d180253SJesper Juhl ret = -ENOMEM; 6836d180253SJesper Juhl break; 6846d180253SJesper Juhl } 68557103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 6866d180253SJesper Juhl kfree(arg_p); 687c66ac9dbSNicholas Bellinger if (ret < 0) { 68857103d7fSJingoo Han pr_err("kstrtoull() failed for" 689c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 690c66ac9dbSNicholas Bellinger goto out; 691c66ac9dbSNicholas Bellinger } 6926708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 693c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 694c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 695c66ac9dbSNicholas Bellinger break; 696b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 697ce31c1b0SJoern Engel ret = match_int(args, &arg); 698ce31c1b0SJoern Engel if (ret) 699ce31c1b0SJoern Engel goto out; 700b32f4c7eSNicholas Bellinger if (arg != 1) { 701b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 702b32f4c7eSNicholas Bellinger ret = -EINVAL; 703b32f4c7eSNicholas Bellinger goto out; 704b32f4c7eSNicholas Bellinger } 705b32f4c7eSNicholas Bellinger 706b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 707b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 708b32f4c7eSNicholas Bellinger 709b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 710b32f4c7eSNicholas Bellinger break; 711c66ac9dbSNicholas Bellinger default: 712c66ac9dbSNicholas Bellinger break; 713c66ac9dbSNicholas Bellinger } 714c66ac9dbSNicholas Bellinger } 715c66ac9dbSNicholas Bellinger 716c66ac9dbSNicholas Bellinger out: 717c66ac9dbSNicholas Bellinger kfree(orig); 718c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 719c66ac9dbSNicholas Bellinger } 720c66ac9dbSNicholas Bellinger 7210fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 722c66ac9dbSNicholas Bellinger { 7230fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 724c66ac9dbSNicholas Bellinger ssize_t bl = 0; 725c66ac9dbSNicholas Bellinger 726c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 727b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 728b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 729b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 730b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 731c66ac9dbSNicholas Bellinger return bl; 732c66ac9dbSNicholas Bellinger } 733c66ac9dbSNicholas Bellinger 734c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 735c66ac9dbSNicholas Bellinger { 7360fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 737cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 738cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 739cd9323fdSNicholas Bellinger unsigned long long dev_size; 740cd9323fdSNicholas Bellinger /* 741cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 742cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 743cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 744cd9323fdSNicholas Bellinger */ 745cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 74621363ca8SNicholas Bellinger dev_size = i_size_read(i); 747cd9323fdSNicholas Bellinger else 748cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 749c66ac9dbSNicholas Bellinger 75021363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 75121363ca8SNicholas Bellinger dev->dev_attrib.block_size); 752c66ac9dbSNicholas Bellinger } 753c66ac9dbSNicholas Bellinger 7540f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 7550f5e2ec4SNicholas Bellinger { 7560f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 7570f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 7580f5e2ec4SNicholas Bellinger struct inode *inode; 7590f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 7600f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 7610f5e2ec4SNicholas Bellinger 7620f5e2ec4SNicholas Bellinger if (!file) { 7630f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 7640f5e2ec4SNicholas Bellinger return -ENODEV; 7650f5e2ec4SNicholas Bellinger } 7660f5e2ec4SNicholas Bellinger 7670f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 7680f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 7690f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 7700f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 7710f5e2ec4SNicholas Bellinger return -ENOSYS; 7720f5e2ec4SNicholas Bellinger } 7730f5e2ec4SNicholas Bellinger 7740f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 7750f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 7760f5e2ec4SNicholas Bellinger 7770f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 7780f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 7790f5e2ec4SNicholas Bellinger 7800f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 7810f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 7820f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 7830f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 7840f5e2ec4SNicholas Bellinger return ret; 7850f5e2ec4SNicholas Bellinger } 7860f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 7870f5e2ec4SNicholas Bellinger 7880f5e2ec4SNicholas Bellinger return 0; 7890f5e2ec4SNicholas Bellinger } 7900f5e2ec4SNicholas Bellinger 7910f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 7920f5e2ec4SNicholas Bellinger { 7930f5e2ec4SNicholas Bellinger unsigned char *buf; 7940f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 79564d240b7SAkinobu Mita int ret; 7960f5e2ec4SNicholas Bellinger 7970f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 7980f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 7990f5e2ec4SNicholas Bellinger return -ENODEV; 8000f5e2ec4SNicholas Bellinger } 8010f5e2ec4SNicholas Bellinger 8020f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 8030f5e2ec4SNicholas Bellinger if (!buf) { 8040f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 8050f5e2ec4SNicholas Bellinger return -ENOMEM; 8060f5e2ec4SNicholas Bellinger } 8070f5e2ec4SNicholas Bellinger 8080f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 80964d240b7SAkinobu Mita (unsigned long long)(dev->transport->get_blocks(dev) + 1) * 81064d240b7SAkinobu Mita dev->prot_length); 8110f5e2ec4SNicholas Bellinger 81280dcd0c1SSagi Grimberg memset(buf, 0xff, unit_size); 81364d240b7SAkinobu Mita ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, 81464d240b7SAkinobu Mita buf, unit_size); 8150f5e2ec4SNicholas Bellinger vfree(buf); 8160f5e2ec4SNicholas Bellinger return ret; 8170f5e2ec4SNicholas Bellinger } 8180f5e2ec4SNicholas Bellinger 8190f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 8200f5e2ec4SNicholas Bellinger { 8210f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8220f5e2ec4SNicholas Bellinger 8230f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 8240f5e2ec4SNicholas Bellinger return; 8250f5e2ec4SNicholas Bellinger 8260f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 8270f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 8280f5e2ec4SNicholas Bellinger } 8290f5e2ec4SNicholas Bellinger 8309e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 8310c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 832ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 8337b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 83470d3ae5cSAsias He .execute_write_same_unmap = fd_execute_write_same_unmap, 83550642762SAsias He .execute_unmap = fd_execute_unmap, 8360c2ad7d1SChristoph Hellwig }; 8370c2ad7d1SChristoph Hellwig 838de103c93SChristoph Hellwig static sense_reason_t 839de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 8400c2ad7d1SChristoph Hellwig { 8419e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 8420c2ad7d1SChristoph Hellwig } 8430c2ad7d1SChristoph Hellwig 8440a06d430SChristoph Hellwig static const struct target_backend_ops fileio_ops = { 845c66ac9dbSNicholas Bellinger .name = "fileio", 8460fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 8470fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 848c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 849c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 850c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 8510fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 8520fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 853c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 8540c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 855c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 856c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 8576f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 858c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 8590f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 8600f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 8610f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 8625873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 863c66ac9dbSNicholas Bellinger }; 864c66ac9dbSNicholas Bellinger 865c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 866c66ac9dbSNicholas Bellinger { 8670a06d430SChristoph Hellwig return transport_backend_register(&fileio_ops); 868c66ac9dbSNicholas Bellinger } 869c66ac9dbSNicholas Bellinger 87063b91d5aSAsias He static void __exit fileio_module_exit(void) 871c66ac9dbSNicholas Bellinger { 8720a06d430SChristoph Hellwig target_backend_unregister(&fileio_ops); 873c66ac9dbSNicholas Bellinger } 874c66ac9dbSNicholas Bellinger 875c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 876c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 877c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 878c66ac9dbSNicholas Bellinger 879c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 880c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 881