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, 64ce8dd25dSChristoph Hellwig TARGET_CORE_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 2444cc987eaSNicholas Bellinger static void fd_dev_call_rcu(struct rcu_head *p) 2454cc987eaSNicholas Bellinger { 2464cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 2474cc987eaSNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 2484cc987eaSNicholas Bellinger 2494cc987eaSNicholas Bellinger kfree(fd_dev); 2504cc987eaSNicholas Bellinger } 2514cc987eaSNicholas Bellinger 2520fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 253c66ac9dbSNicholas Bellinger { 2540fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 255c66ac9dbSNicholas Bellinger 256c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 257c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 258c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 259c66ac9dbSNicholas Bellinger } 2604cc987eaSNicholas Bellinger call_rcu(&dev->rcu_head, fd_dev_call_rcu); 261c66ac9dbSNicholas Bellinger } 262c66ac9dbSNicholas Bellinger 2638287fa5fSSagi Grimberg static int fd_do_rw(struct se_cmd *cmd, struct file *fd, 2648287fa5fSSagi Grimberg u32 block_size, struct scatterlist *sgl, 2658287fa5fSSagi Grimberg u32 sgl_nents, u32 data_length, int is_write) 26642201b55SNicholas Bellinger { 2675787cacdSChristoph Hellwig struct scatterlist *sg; 2686b9a44d0SChristoph Hellwig struct iov_iter iter; 2696b9a44d0SChristoph Hellwig struct bio_vec *bvec; 2706b9a44d0SChristoph Hellwig ssize_t len = 0; 2718287fa5fSSagi Grimberg loff_t pos = (cmd->t_task_lba * block_size); 272c66ac9dbSNicholas Bellinger int ret = 0, i; 273c66ac9dbSNicholas Bellinger 2746b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 2756b9a44d0SChristoph Hellwig if (!bvec) { 2766708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 277e3d6f909SAndy Grover return -ENOMEM; 278c66ac9dbSNicholas Bellinger } 279c66ac9dbSNicholas Bellinger 2805787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2816b9a44d0SChristoph Hellwig bvec[i].bv_page = sg_page(sg); 2826b9a44d0SChristoph Hellwig bvec[i].bv_len = sg->length; 2836b9a44d0SChristoph Hellwig bvec[i].bv_offset = sg->offset; 2846b9a44d0SChristoph Hellwig 2856b9a44d0SChristoph Hellwig len += sg->length; 286c66ac9dbSNicholas Bellinger } 287c66ac9dbSNicholas Bellinger 2886b9a44d0SChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len); 289778229afSSebastian Andrzej Siewior if (is_write) 2906b9a44d0SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos); 291778229afSSebastian Andrzej Siewior else 2926b9a44d0SChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos); 293778229afSSebastian Andrzej Siewior 2946b9a44d0SChristoph Hellwig kfree(bvec); 295778229afSSebastian Andrzej Siewior 296778229afSSebastian Andrzej Siewior if (is_write) { 2978287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 298778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 299778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 300778229afSSebastian Andrzej Siewior } 301778229afSSebastian Andrzej Siewior } else { 302c66ac9dbSNicholas Bellinger /* 303c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 304c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 305c66ac9dbSNicholas Bellinger * block_device. 306c66ac9dbSNicholas Bellinger */ 307496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3088287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 309778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 310778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 3118287fa5fSSagi Grimberg data_length); 312e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 313c66ac9dbSNicholas Bellinger } 314c66ac9dbSNicholas Bellinger } else { 315c66ac9dbSNicholas Bellinger if (ret < 0) { 316778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 317778229afSSebastian Andrzej Siewior __func__, ret); 318e3d6f909SAndy Grover return ret; 319c66ac9dbSNicholas Bellinger } 320c66ac9dbSNicholas Bellinger } 321c66ac9dbSNicholas Bellinger } 322c66ac9dbSNicholas Bellinger return 1; 323c66ac9dbSNicholas Bellinger } 324c66ac9dbSNicholas Bellinger 325de103c93SChristoph Hellwig static sense_reason_t 326de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 327c66ac9dbSNicholas Bellinger { 328c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3290fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 330a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 331c66ac9dbSNicholas Bellinger loff_t start, end; 332c66ac9dbSNicholas Bellinger int ret; 333c66ac9dbSNicholas Bellinger 334c66ac9dbSNicholas Bellinger /* 335c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 336c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 337c66ac9dbSNicholas Bellinger */ 338c66ac9dbSNicholas Bellinger if (immed) 3395787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 340c66ac9dbSNicholas Bellinger 341c66ac9dbSNicholas Bellinger /* 342c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 343c66ac9dbSNicholas Bellinger */ 344a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 345c66ac9dbSNicholas Bellinger start = 0; 346c66ac9dbSNicholas Bellinger end = LLONG_MAX; 347c66ac9dbSNicholas Bellinger } else { 3480fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 349c66ac9dbSNicholas Bellinger if (cmd->data_length) 35062d3ab49SZach Brown end = start + cmd->data_length - 1; 351c66ac9dbSNicholas Bellinger else 352c66ac9dbSNicholas Bellinger end = LLONG_MAX; 353c66ac9dbSNicholas Bellinger } 354c66ac9dbSNicholas Bellinger 355c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 356c66ac9dbSNicholas Bellinger if (ret != 0) 3576708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 358c66ac9dbSNicholas Bellinger 3595787cacdSChristoph Hellwig if (immed) 360ad67f0d9SChristoph Hellwig return 0; 3615787cacdSChristoph Hellwig 362de103c93SChristoph Hellwig if (ret) 3635787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 364de103c93SChristoph Hellwig else 3655787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 366ad67f0d9SChristoph Hellwig 367ad67f0d9SChristoph Hellwig return 0; 368c66ac9dbSNicholas Bellinger } 369c66ac9dbSNicholas Bellinger 3707b745c84SNicholas Bellinger static sense_reason_t 3717b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 3727b745c84SNicholas Bellinger { 3737b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 3747b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 3757b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 376d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 377d4c5dcacSChristoph Hellwig struct iov_iter iter; 378d4c5dcacSChristoph Hellwig struct bio_vec *bvec; 379d4c5dcacSChristoph Hellwig unsigned int len = 0, i; 380d4c5dcacSChristoph Hellwig ssize_t ret; 3817b745c84SNicholas Bellinger 3827b745c84SNicholas Bellinger if (!nolb) { 3837b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 3847b745c84SNicholas Bellinger return 0; 3857b745c84SNicholas Bellinger } 386afd73f1bSNicholas Bellinger if (cmd->prot_op) { 387afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO" 388afd73f1bSNicholas Bellinger " backends not supported\n"); 389afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 390afd73f1bSNicholas Bellinger } 3917b745c84SNicholas Bellinger 3927b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 393d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 3947b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 395d4c5dcacSChristoph Hellwig " block_size: %u\n", 396d4c5dcacSChristoph Hellwig cmd->t_data_nents, 397d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length, 3987b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 3997b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4007b745c84SNicholas Bellinger } 4017b745c84SNicholas Bellinger 402d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 403d4c5dcacSChristoph Hellwig if (!bvec) 4047b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4057b745c84SNicholas Bellinger 406d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) { 407d4c5dcacSChristoph Hellwig bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 408d4c5dcacSChristoph Hellwig bvec[i].bv_len = cmd->t_data_sg[0].length; 409d4c5dcacSChristoph Hellwig bvec[i].bv_offset = cmd->t_data_sg[0].offset; 410d4c5dcacSChristoph Hellwig 411d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size; 4127b745c84SNicholas Bellinger } 4137b745c84SNicholas Bellinger 414d4c5dcacSChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len); 415d4c5dcacSChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos); 4167b745c84SNicholas Bellinger 417d4c5dcacSChristoph Hellwig kfree(bvec); 418d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) { 419d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret); 4207b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4217b745c84SNicholas Bellinger } 4227b745c84SNicholas Bellinger 4237b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4247b745c84SNicholas Bellinger return 0; 4257b745c84SNicholas Bellinger } 4267b745c84SNicholas Bellinger 42764d240b7SAkinobu Mita static int 42864d240b7SAkinobu Mita fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, 42964d240b7SAkinobu Mita void *buf, size_t bufsize) 43064d240b7SAkinobu Mita { 43164d240b7SAkinobu Mita struct fd_dev *fd_dev = FD_DEV(se_dev); 43264d240b7SAkinobu Mita struct file *prot_fd = fd_dev->fd_prot_file; 43364d240b7SAkinobu Mita sector_t prot_length, prot; 43464d240b7SAkinobu Mita loff_t pos = lba * se_dev->prot_length; 43564d240b7SAkinobu Mita 43664d240b7SAkinobu Mita if (!prot_fd) { 43764d240b7SAkinobu Mita pr_err("Unable to locate fd_dev->fd_prot_file\n"); 43864d240b7SAkinobu Mita return -ENODEV; 43964d240b7SAkinobu Mita } 44064d240b7SAkinobu Mita 44164d240b7SAkinobu Mita prot_length = nolb * se_dev->prot_length; 44264d240b7SAkinobu Mita 44364d240b7SAkinobu Mita for (prot = 0; prot < prot_length;) { 44464d240b7SAkinobu Mita sector_t len = min_t(sector_t, bufsize, prot_length - prot); 44564d240b7SAkinobu Mita ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot); 44664d240b7SAkinobu Mita 44764d240b7SAkinobu Mita if (ret != len) { 44864d240b7SAkinobu Mita pr_err("vfs_write to prot file failed: %zd\n", ret); 44964d240b7SAkinobu Mita return ret < 0 ? ret : -ENODEV; 45064d240b7SAkinobu Mita } 45164d240b7SAkinobu Mita prot += ret; 45264d240b7SAkinobu Mita } 45364d240b7SAkinobu Mita 45464d240b7SAkinobu Mita return 0; 45564d240b7SAkinobu Mita } 45664d240b7SAkinobu Mita 45764d240b7SAkinobu Mita static int 45864d240b7SAkinobu Mita fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 45964d240b7SAkinobu Mita { 46064d240b7SAkinobu Mita void *buf; 46164d240b7SAkinobu Mita int rc; 46264d240b7SAkinobu Mita 46364d240b7SAkinobu Mita buf = (void *)__get_free_page(GFP_KERNEL); 46464d240b7SAkinobu Mita if (!buf) { 46564d240b7SAkinobu Mita pr_err("Unable to allocate FILEIO prot buf\n"); 46664d240b7SAkinobu Mita return -ENOMEM; 46764d240b7SAkinobu Mita } 46864d240b7SAkinobu Mita memset(buf, 0xff, PAGE_SIZE); 46964d240b7SAkinobu Mita 47064d240b7SAkinobu Mita rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); 47164d240b7SAkinobu Mita 47264d240b7SAkinobu Mita free_page((unsigned long)buf); 47364d240b7SAkinobu Mita 47464d240b7SAkinobu Mita return rc; 47564d240b7SAkinobu Mita } 47664d240b7SAkinobu Mita 477de103c93SChristoph Hellwig static sense_reason_t 47862e46942SChristoph Hellwig fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 47970d3ae5cSAsias He { 48062e46942SChristoph Hellwig struct file *file = FD_DEV(cmd->se_dev)->fd_file; 48170d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 48270d3ae5cSAsias He int ret; 48370d3ae5cSAsias He 48464d240b7SAkinobu Mita if (cmd->se_dev->dev_attrib.pi_prot_type) { 48564d240b7SAkinobu Mita ret = fd_do_prot_unmap(cmd, lba, nolb); 48664d240b7SAkinobu Mita if (ret) 48764d240b7SAkinobu Mita return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 48864d240b7SAkinobu Mita } 48964d240b7SAkinobu Mita 49070d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 49170d3ae5cSAsias He /* The backend is block device, use discard */ 49270d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 49370d3ae5cSAsias He 49443f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 49570d3ae5cSAsias He nolb, GFP_KERNEL, 0); 49670d3ae5cSAsias He if (ret < 0) { 49770d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 49870d3ae5cSAsias He ret); 49970d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50070d3ae5cSAsias He } 50170d3ae5cSAsias He } else { 50270d3ae5cSAsias He /* The backend is normal file, use fallocate */ 50343f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 50443f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 50570d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 50670d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 50770d3ae5cSAsias He 50870d3ae5cSAsias He if (!file->f_op->fallocate) 50970d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51070d3ae5cSAsias He 51170d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 51270d3ae5cSAsias He if (ret < 0) { 51370d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 51470d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51570d3ae5cSAsias He } 51670d3ae5cSAsias He } 51770d3ae5cSAsias He 51843f55bbbSAsias He return 0; 51943f55bbbSAsias He } 52043f55bbbSAsias He 52143f55bbbSAsias He static sense_reason_t 522a82a9538SNicholas Bellinger fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 523a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 524c66ac9dbSNicholas Bellinger { 525c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 5268287fa5fSSagi Grimberg struct fd_dev *fd_dev = FD_DEV(dev); 5278287fa5fSSagi Grimberg struct file *file = fd_dev->fd_file; 5288287fa5fSSagi Grimberg struct file *pfile = fd_dev->fd_prot_file; 52942201b55SNicholas Bellinger sense_reason_t rc; 530c66ac9dbSNicholas Bellinger int ret = 0; 531046ba642SNicholas Bellinger /* 532046ba642SNicholas Bellinger * We are currently limited by the number of iovecs (2048) per 533046ba642SNicholas Bellinger * single vfs_[writev,readv] call. 534046ba642SNicholas Bellinger */ 535046ba642SNicholas Bellinger if (cmd->data_length > FD_MAX_BYTES) { 536046ba642SNicholas Bellinger pr_err("FILEIO: Not able to process I/O of %u bytes due to" 537046ba642SNicholas Bellinger "FD_MAX_BYTES: %u iovec count limitiation\n", 538046ba642SNicholas Bellinger cmd->data_length, FD_MAX_BYTES); 539046ba642SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 540046ba642SNicholas Bellinger } 541c66ac9dbSNicholas Bellinger /* 542c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 543c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 544c66ac9dbSNicholas Bellinger */ 5455787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 546ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5478287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 5488287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 5498287fa5fSSagi Grimberg cmd->prot_length, 0); 55042201b55SNicholas Bellinger if (ret < 0) 55142201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 55242201b55SNicholas Bellinger } 55342201b55SNicholas Bellinger 5548287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 5558287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 0); 55642201b55SNicholas Bellinger 557ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5588287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5598287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 56042201b55SNicholas Bellinger 561f75b6faeSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 562f75b6faeSSagi Grimberg 0, cmd->t_prot_sg, 0); 5638287fa5fSSagi Grimberg if (rc) 56442201b55SNicholas Bellinger return rc; 56542201b55SNicholas Bellinger } 5668287fa5fSSagi Grimberg } else { 5678287fa5fSSagi Grimberg if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5688287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5698287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 5708287fa5fSSagi Grimberg 5718287fa5fSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 5728287fa5fSSagi Grimberg 0, cmd->t_prot_sg, 0); 5738287fa5fSSagi Grimberg if (rc) 5748287fa5fSSagi Grimberg return rc; 57542201b55SNicholas Bellinger } 57642201b55SNicholas Bellinger 5778287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 5788287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 1); 579a4dff304SNicholas Bellinger /* 580125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 581a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 582a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 583a4dff304SNicholas Bellinger */ 584814e5b45SChristoph Hellwig if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { 585a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 5860fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 58762d3ab49SZach Brown loff_t end; 58862d3ab49SZach Brown 58962d3ab49SZach Brown if (cmd->data_length) 59062d3ab49SZach Brown end = start + cmd->data_length - 1; 59162d3ab49SZach Brown else 59262d3ab49SZach Brown end = LLONG_MAX; 593c66ac9dbSNicholas Bellinger 594a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 595a4dff304SNicholas Bellinger } 596c66ac9dbSNicholas Bellinger 597ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5988287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 5998287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 6008287fa5fSSagi Grimberg cmd->prot_length, 1); 601de103c93SChristoph Hellwig if (ret < 0) 602de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 60342201b55SNicholas Bellinger } 60442201b55SNicholas Bellinger } 60542201b55SNicholas Bellinger 6068287fa5fSSagi Grimberg if (ret < 0) 60742201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 608de103c93SChristoph Hellwig 6095787cacdSChristoph Hellwig if (ret) 6105787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 61103e98c9eSNicholas Bellinger return 0; 612c66ac9dbSNicholas Bellinger } 613c66ac9dbSNicholas Bellinger 614c66ac9dbSNicholas Bellinger enum { 615c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 616c66ac9dbSNicholas Bellinger }; 617c66ac9dbSNicholas Bellinger 618c66ac9dbSNicholas Bellinger static match_table_t tokens = { 619c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 620c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 621b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 622c66ac9dbSNicholas Bellinger {Opt_err, NULL} 623c66ac9dbSNicholas Bellinger }; 624c66ac9dbSNicholas Bellinger 6250fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 626c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 627c66ac9dbSNicholas Bellinger { 6280fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 629c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 630c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 631b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 632c66ac9dbSNicholas Bellinger 633c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 634c66ac9dbSNicholas Bellinger if (!opts) 635c66ac9dbSNicholas Bellinger return -ENOMEM; 636c66ac9dbSNicholas Bellinger 637c66ac9dbSNicholas Bellinger orig = opts; 638c66ac9dbSNicholas Bellinger 63990c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 640c66ac9dbSNicholas Bellinger if (!*ptr) 641c66ac9dbSNicholas Bellinger continue; 642c66ac9dbSNicholas Bellinger 643c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 644c66ac9dbSNicholas Bellinger switch (token) { 645c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 646dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 647dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 648dbc6e022SAl Viro ret = -EINVAL; 6496d180253SJesper Juhl break; 6506d180253SJesper Juhl } 6516708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 652c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 653c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 654c66ac9dbSNicholas Bellinger break; 655c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 656c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 6576d180253SJesper Juhl if (!arg_p) { 6586d180253SJesper Juhl ret = -ENOMEM; 6596d180253SJesper Juhl break; 6606d180253SJesper Juhl } 66157103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 6626d180253SJesper Juhl kfree(arg_p); 663c66ac9dbSNicholas Bellinger if (ret < 0) { 66457103d7fSJingoo Han pr_err("kstrtoull() failed for" 665c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 666c66ac9dbSNicholas Bellinger goto out; 667c66ac9dbSNicholas Bellinger } 6686708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 669c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 670c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 671c66ac9dbSNicholas Bellinger break; 672b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 673ce31c1b0SJoern Engel ret = match_int(args, &arg); 674ce31c1b0SJoern Engel if (ret) 675ce31c1b0SJoern Engel goto out; 676b32f4c7eSNicholas Bellinger if (arg != 1) { 677b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 678b32f4c7eSNicholas Bellinger ret = -EINVAL; 679b32f4c7eSNicholas Bellinger goto out; 680b32f4c7eSNicholas Bellinger } 681b32f4c7eSNicholas Bellinger 682b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 683b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 684b32f4c7eSNicholas Bellinger 685b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 686b32f4c7eSNicholas Bellinger break; 687c66ac9dbSNicholas Bellinger default: 688c66ac9dbSNicholas Bellinger break; 689c66ac9dbSNicholas Bellinger } 690c66ac9dbSNicholas Bellinger } 691c66ac9dbSNicholas Bellinger 692c66ac9dbSNicholas Bellinger out: 693c66ac9dbSNicholas Bellinger kfree(orig); 694c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 695c66ac9dbSNicholas Bellinger } 696c66ac9dbSNicholas Bellinger 6970fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 698c66ac9dbSNicholas Bellinger { 6990fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 700c66ac9dbSNicholas Bellinger ssize_t bl = 0; 701c66ac9dbSNicholas Bellinger 702c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 703b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 704b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 705b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 706b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 707c66ac9dbSNicholas Bellinger return bl; 708c66ac9dbSNicholas Bellinger } 709c66ac9dbSNicholas Bellinger 710c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 711c66ac9dbSNicholas Bellinger { 7120fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 713cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 714cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 715cd9323fdSNicholas Bellinger unsigned long long dev_size; 716cd9323fdSNicholas Bellinger /* 717cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 718cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 719cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 720cd9323fdSNicholas Bellinger */ 721cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 72221363ca8SNicholas Bellinger dev_size = i_size_read(i); 723cd9323fdSNicholas Bellinger else 724cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 725c66ac9dbSNicholas Bellinger 72621363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 72721363ca8SNicholas Bellinger dev->dev_attrib.block_size); 728c66ac9dbSNicholas Bellinger } 729c66ac9dbSNicholas Bellinger 7300f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 7310f5e2ec4SNicholas Bellinger { 7320f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 7330f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 7340f5e2ec4SNicholas Bellinger struct inode *inode; 7350f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 7360f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 7370f5e2ec4SNicholas Bellinger 7380f5e2ec4SNicholas Bellinger if (!file) { 7390f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 7400f5e2ec4SNicholas Bellinger return -ENODEV; 7410f5e2ec4SNicholas Bellinger } 7420f5e2ec4SNicholas Bellinger 7430f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 7440f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 7450f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 7460f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 7470f5e2ec4SNicholas Bellinger return -ENOSYS; 7480f5e2ec4SNicholas Bellinger } 7490f5e2ec4SNicholas Bellinger 7500f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 7510f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 7520f5e2ec4SNicholas Bellinger 7530f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 7540f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 7550f5e2ec4SNicholas Bellinger 7560f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 7570f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 7580f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 7590f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 7600f5e2ec4SNicholas Bellinger return ret; 7610f5e2ec4SNicholas Bellinger } 7620f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 7630f5e2ec4SNicholas Bellinger 7640f5e2ec4SNicholas Bellinger return 0; 7650f5e2ec4SNicholas Bellinger } 7660f5e2ec4SNicholas Bellinger 7670f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 7680f5e2ec4SNicholas Bellinger { 7690f5e2ec4SNicholas Bellinger unsigned char *buf; 7700f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 77164d240b7SAkinobu Mita int ret; 7720f5e2ec4SNicholas Bellinger 7730f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 7740f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 7750f5e2ec4SNicholas Bellinger return -ENODEV; 7760f5e2ec4SNicholas Bellinger } 7770f5e2ec4SNicholas Bellinger 7780f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 7790f5e2ec4SNicholas Bellinger if (!buf) { 7800f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 7810f5e2ec4SNicholas Bellinger return -ENOMEM; 7820f5e2ec4SNicholas Bellinger } 7830f5e2ec4SNicholas Bellinger 7840f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 78564d240b7SAkinobu Mita (unsigned long long)(dev->transport->get_blocks(dev) + 1) * 78664d240b7SAkinobu Mita dev->prot_length); 7870f5e2ec4SNicholas Bellinger 78880dcd0c1SSagi Grimberg memset(buf, 0xff, unit_size); 78964d240b7SAkinobu Mita ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, 79064d240b7SAkinobu Mita buf, unit_size); 7910f5e2ec4SNicholas Bellinger vfree(buf); 7920f5e2ec4SNicholas Bellinger return ret; 7930f5e2ec4SNicholas Bellinger } 7940f5e2ec4SNicholas Bellinger 7950f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 7960f5e2ec4SNicholas Bellinger { 7970f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 7980f5e2ec4SNicholas Bellinger 7990f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 8000f5e2ec4SNicholas Bellinger return; 8010f5e2ec4SNicholas Bellinger 8020f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 8030f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 8040f5e2ec4SNicholas Bellinger } 8050f5e2ec4SNicholas Bellinger 8069e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 8070c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 808ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 8097b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 81050642762SAsias He .execute_unmap = fd_execute_unmap, 8110c2ad7d1SChristoph Hellwig }; 8120c2ad7d1SChristoph Hellwig 813de103c93SChristoph Hellwig static sense_reason_t 814de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 8150c2ad7d1SChristoph Hellwig { 8169e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 8170c2ad7d1SChristoph Hellwig } 8180c2ad7d1SChristoph Hellwig 8190a06d430SChristoph Hellwig static const struct target_backend_ops fileio_ops = { 820c66ac9dbSNicholas Bellinger .name = "fileio", 8210fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 8220fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 823c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 824c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 825c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 8260fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 8270fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 828c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 8290c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 830c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 831c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 8326f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 833c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 8340f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 8350f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 8360f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 8375873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 838c66ac9dbSNicholas Bellinger }; 839c66ac9dbSNicholas Bellinger 840c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 841c66ac9dbSNicholas Bellinger { 8420a06d430SChristoph Hellwig return transport_backend_register(&fileio_ops); 843c66ac9dbSNicholas Bellinger } 844c66ac9dbSNicholas Bellinger 84563b91d5aSAsias He static void __exit fileio_module_exit(void) 846c66ac9dbSNicholas Bellinger { 8470a06d430SChristoph Hellwig target_backend_unregister(&fileio_ops); 848c66ac9dbSNicholas Bellinger } 849c66ac9dbSNicholas Bellinger 850c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 851c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 852c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 853c66ac9dbSNicholas Bellinger 854c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 855c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 856