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 /* fd_attach_hba(): (Part of se_subsystem_api_t template) 49c66ac9dbSNicholas Bellinger * 50c66ac9dbSNicholas Bellinger * 51c66ac9dbSNicholas Bellinger */ 52c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 53c66ac9dbSNicholas Bellinger { 54c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 55c66ac9dbSNicholas Bellinger 56c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 576708bb27SAndy Grover if (!fd_host) { 586708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 59e3d6f909SAndy Grover return -ENOMEM; 60c66ac9dbSNicholas Bellinger } 61c66ac9dbSNicholas Bellinger 62c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 63c66ac9dbSNicholas Bellinger 64e3d6f909SAndy Grover hba->hba_ptr = fd_host; 65c66ac9dbSNicholas Bellinger 666708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 67c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 68c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 6995cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 7095cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id); 71c66ac9dbSNicholas Bellinger 72c66ac9dbSNicholas Bellinger return 0; 73c66ac9dbSNicholas Bellinger } 74c66ac9dbSNicholas Bellinger 75c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 76c66ac9dbSNicholas Bellinger { 77c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 78c66ac9dbSNicholas Bellinger 796708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 80c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 81c66ac9dbSNicholas Bellinger 82c66ac9dbSNicholas Bellinger kfree(fd_host); 83c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 84c66ac9dbSNicholas Bellinger } 85c66ac9dbSNicholas Bellinger 860fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 87c66ac9dbSNicholas Bellinger { 88c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 898359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 90c66ac9dbSNicholas Bellinger 91c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 926708bb27SAndy Grover if (!fd_dev) { 936708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 94c66ac9dbSNicholas Bellinger return NULL; 95c66ac9dbSNicholas Bellinger } 96c66ac9dbSNicholas Bellinger 97c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 98c66ac9dbSNicholas Bellinger 996708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 100c66ac9dbSNicholas Bellinger 1010fd97ccfSChristoph Hellwig return &fd_dev->dev; 102c66ac9dbSNicholas Bellinger } 103c66ac9dbSNicholas Bellinger 1040fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 105c66ac9dbSNicholas Bellinger { 1060fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1070fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 108c66ac9dbSNicholas Bellinger struct file *file; 109c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1100fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 111c66ac9dbSNicholas Bellinger 1120fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1130fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1140fd97ccfSChristoph Hellwig return -EINVAL; 1150fd97ccfSChristoph Hellwig } 116c66ac9dbSNicholas Bellinger 117c66ac9dbSNicholas Bellinger /* 118a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 119a4dff304SNicholas Bellinger * of pure timestamp updates. 120c66ac9dbSNicholas Bellinger */ 121a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1220fd97ccfSChristoph Hellwig 123b32f4c7eSNicholas Bellinger /* 124b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 125b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 126b32f4c7eSNicholas Bellinger * 127b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 128b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 129b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 130b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 131b32f4c7eSNicholas Bellinger */ 132b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 133b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 134b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 135b32f4c7eSNicholas Bellinger } 136c66ac9dbSNicholas Bellinger 137dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 138613640e4SNicholas Bellinger if (IS_ERR(file)) { 139dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 140613640e4SNicholas Bellinger ret = PTR_ERR(file); 141613640e4SNicholas Bellinger goto fail; 142613640e4SNicholas Bellinger } 143c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 144c66ac9dbSNicholas Bellinger /* 145c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 146c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 147c66ac9dbSNicholas Bellinger * 148c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 149c66ac9dbSNicholas Bellinger */ 150c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 151c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1520fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 153cd9323fdSNicholas Bellinger unsigned long long dev_size; 1540fd97ccfSChristoph Hellwig 15521363ca8SNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 156c66ac9dbSNicholas Bellinger /* 157c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 158c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 159c66ac9dbSNicholas Bellinger */ 160cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 161c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 162c66ac9dbSNicholas Bellinger 1636708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 164c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 165cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 166c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 16770d3ae5cSAsias He /* 16870d3ae5cSAsias He * Check if the underlying struct block_device request_queue supports 16970d3ae5cSAsias He * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 17070d3ae5cSAsias He * in ATA and we need to set TPE=1 17170d3ae5cSAsias He */ 17270d3ae5cSAsias He if (blk_queue_discard(q)) { 17370d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 17470d3ae5cSAsias He q->limits.max_discard_sectors; 17570d3ae5cSAsias He /* 17670d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 17770d3ae5cSAsias He */ 17870d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 17970d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 18070d3ae5cSAsias He q->limits.discard_granularity >> 9; 18170d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 18270d3ae5cSAsias He q->limits.discard_alignment; 18370d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 18470d3ae5cSAsias He " disabled by default\n"); 18570d3ae5cSAsias He } 18670d3ae5cSAsias He /* 18770d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 18870d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 18970d3ae5cSAsias He */ 19070d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1910463a3feSAsias He 1920463a3feSAsias He if (blk_queue_nonrot(q)) 1930463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 194c66ac9dbSNicholas Bellinger } else { 195c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1966708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 197c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 198c66ac9dbSNicholas Bellinger " block_device\n"); 199c66ac9dbSNicholas Bellinger goto fail; 200c66ac9dbSNicholas Bellinger } 201c66ac9dbSNicholas Bellinger 20221363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 20370d3ae5cSAsias He /* 20470d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 20570d3ae5cSAsias He */ 20670d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 20770d3ae5cSAsias He /* 20870d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 20970d3ae5cSAsias He */ 21070d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 21170d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 21270d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 21370d3ae5cSAsias He 21470d3ae5cSAsias He /* 21570d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 21670d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 21770d3ae5cSAsias He */ 21870d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 219c66ac9dbSNicholas Bellinger } 220c66ac9dbSNicholas Bellinger 22121363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 22295cadaceSNicholas Bellinger dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 22395cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 2240fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 225c66ac9dbSNicholas Bellinger 226b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 227b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 228b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2290fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 230b32f4c7eSNicholas Bellinger } 231b32f4c7eSNicholas Bellinger 232c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 233c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 234c66ac9dbSNicholas Bellinger 2356708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 236c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 237c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 238c66ac9dbSNicholas Bellinger 2390fd97ccfSChristoph Hellwig return 0; 240c66ac9dbSNicholas Bellinger fail: 241c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 242c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 243c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 244c66ac9dbSNicholas Bellinger } 2450fd97ccfSChristoph Hellwig return ret; 246c66ac9dbSNicholas Bellinger } 247c66ac9dbSNicholas Bellinger 2480fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 249c66ac9dbSNicholas Bellinger { 2500fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 251c66ac9dbSNicholas Bellinger 252c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 253c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 254c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 255c66ac9dbSNicholas Bellinger } 256c66ac9dbSNicholas Bellinger 257c66ac9dbSNicholas Bellinger kfree(fd_dev); 258c66ac9dbSNicholas Bellinger } 259c66ac9dbSNicholas Bellinger 26042201b55SNicholas Bellinger static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, 26142201b55SNicholas Bellinger int is_write) 26242201b55SNicholas Bellinger { 26342201b55SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 26442201b55SNicholas Bellinger struct fd_dev *dev = FD_DEV(se_dev); 26542201b55SNicholas Bellinger struct file *prot_fd = dev->fd_prot_file; 26642201b55SNicholas Bellinger struct scatterlist *sg; 26742201b55SNicholas Bellinger loff_t pos = (cmd->t_task_lba * se_dev->prot_length); 26842201b55SNicholas Bellinger unsigned char *buf; 26942201b55SNicholas Bellinger u32 prot_size, len, size; 27042201b55SNicholas Bellinger int rc, ret = 1, i; 27142201b55SNicholas Bellinger 27242201b55SNicholas Bellinger prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) * 27342201b55SNicholas Bellinger se_dev->prot_length; 27442201b55SNicholas Bellinger 27542201b55SNicholas Bellinger if (!is_write) { 27642201b55SNicholas Bellinger fd_prot->prot_buf = vzalloc(prot_size); 27742201b55SNicholas Bellinger if (!fd_prot->prot_buf) { 27842201b55SNicholas Bellinger pr_err("Unable to allocate fd_prot->prot_buf\n"); 27942201b55SNicholas Bellinger return -ENOMEM; 28042201b55SNicholas Bellinger } 28142201b55SNicholas Bellinger buf = fd_prot->prot_buf; 28242201b55SNicholas Bellinger 28342201b55SNicholas Bellinger fd_prot->prot_sg_nents = cmd->t_prot_nents; 28442201b55SNicholas Bellinger fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) * 28542201b55SNicholas Bellinger fd_prot->prot_sg_nents, GFP_KERNEL); 28642201b55SNicholas Bellinger if (!fd_prot->prot_sg) { 28742201b55SNicholas Bellinger pr_err("Unable to allocate fd_prot->prot_sg\n"); 28842201b55SNicholas Bellinger vfree(fd_prot->prot_buf); 28942201b55SNicholas Bellinger return -ENOMEM; 29042201b55SNicholas Bellinger } 29142201b55SNicholas Bellinger size = prot_size; 29242201b55SNicholas Bellinger 29342201b55SNicholas Bellinger for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) { 29442201b55SNicholas Bellinger 29542201b55SNicholas Bellinger len = min_t(u32, PAGE_SIZE, size); 29642201b55SNicholas Bellinger sg_set_buf(sg, buf, len); 29742201b55SNicholas Bellinger size -= len; 29842201b55SNicholas Bellinger buf += len; 29942201b55SNicholas Bellinger } 30042201b55SNicholas Bellinger } 30142201b55SNicholas Bellinger 30242201b55SNicholas Bellinger if (is_write) { 30342201b55SNicholas Bellinger rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos); 30442201b55SNicholas Bellinger if (rc < 0 || prot_size != rc) { 30542201b55SNicholas Bellinger pr_err("kernel_write() for fd_do_prot_rw failed:" 30642201b55SNicholas Bellinger " %d\n", rc); 30742201b55SNicholas Bellinger ret = -EINVAL; 30842201b55SNicholas Bellinger } 30942201b55SNicholas Bellinger } else { 31042201b55SNicholas Bellinger rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size); 31142201b55SNicholas Bellinger if (rc < 0) { 31242201b55SNicholas Bellinger pr_err("kernel_read() for fd_do_prot_rw failed:" 31342201b55SNicholas Bellinger " %d\n", rc); 31442201b55SNicholas Bellinger ret = -EINVAL; 31542201b55SNicholas Bellinger } 31642201b55SNicholas Bellinger } 31742201b55SNicholas Bellinger 31842201b55SNicholas Bellinger if (is_write || ret < 0) { 31942201b55SNicholas Bellinger kfree(fd_prot->prot_sg); 32042201b55SNicholas Bellinger vfree(fd_prot->prot_buf); 32142201b55SNicholas Bellinger } 32242201b55SNicholas Bellinger 32342201b55SNicholas Bellinger return ret; 32442201b55SNicholas Bellinger } 32542201b55SNicholas Bellinger 326778229afSSebastian Andrzej Siewior static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 327778229afSSebastian Andrzej Siewior u32 sgl_nents, int is_write) 328c66ac9dbSNicholas Bellinger { 3295787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 3300fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 3316708bb27SAndy Grover struct file *fd = dev->fd_file; 3325787cacdSChristoph Hellwig struct scatterlist *sg; 333c66ac9dbSNicholas Bellinger struct iovec *iov; 334c66ac9dbSNicholas Bellinger mm_segment_t old_fs; 3350fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 336c66ac9dbSNicholas Bellinger int ret = 0, i; 337c66ac9dbSNicholas Bellinger 3385787cacdSChristoph Hellwig iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 3396708bb27SAndy Grover if (!iov) { 3406708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 341e3d6f909SAndy Grover return -ENOMEM; 342c66ac9dbSNicholas Bellinger } 343c66ac9dbSNicholas Bellinger 3445787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 3459649fa1bSSebastian Andrzej Siewior iov[i].iov_len = sg->length; 34640ff2c3bSSebastian Andrzej Siewior iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 347c66ac9dbSNicholas Bellinger } 348c66ac9dbSNicholas Bellinger 349c66ac9dbSNicholas Bellinger old_fs = get_fs(); 350c66ac9dbSNicholas Bellinger set_fs(get_ds()); 351778229afSSebastian Andrzej Siewior 352778229afSSebastian Andrzej Siewior if (is_write) 353778229afSSebastian Andrzej Siewior ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 354778229afSSebastian Andrzej Siewior else 3555787cacdSChristoph Hellwig ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 356778229afSSebastian Andrzej Siewior 357c66ac9dbSNicholas Bellinger set_fs(old_fs); 358c66ac9dbSNicholas Bellinger 35940ff2c3bSSebastian Andrzej Siewior for_each_sg(sgl, sg, sgl_nents, i) 36040ff2c3bSSebastian Andrzej Siewior kunmap(sg_page(sg)); 361778229afSSebastian Andrzej Siewior 362c66ac9dbSNicholas Bellinger kfree(iov); 363778229afSSebastian Andrzej Siewior 364778229afSSebastian Andrzej Siewior if (is_write) { 365778229afSSebastian Andrzej Siewior if (ret < 0 || ret != cmd->data_length) { 366778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 367778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 368778229afSSebastian Andrzej Siewior } 369778229afSSebastian Andrzej Siewior } else { 370c66ac9dbSNicholas Bellinger /* 371c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 372c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 373c66ac9dbSNicholas Bellinger * block_device. 374c66ac9dbSNicholas Bellinger */ 375496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3765787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 377778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 378778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 379778229afSSebastian Andrzej Siewior cmd->data_length); 380e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 381c66ac9dbSNicholas Bellinger } 382c66ac9dbSNicholas Bellinger } else { 383c66ac9dbSNicholas Bellinger if (ret < 0) { 384778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 385778229afSSebastian Andrzej Siewior __func__, ret); 386e3d6f909SAndy Grover return ret; 387c66ac9dbSNicholas Bellinger } 388c66ac9dbSNicholas Bellinger } 389c66ac9dbSNicholas Bellinger } 390c66ac9dbSNicholas Bellinger return 1; 391c66ac9dbSNicholas Bellinger } 392c66ac9dbSNicholas Bellinger 393de103c93SChristoph Hellwig static sense_reason_t 394de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 395c66ac9dbSNicholas Bellinger { 396c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3970fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 398a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 399c66ac9dbSNicholas Bellinger loff_t start, end; 400c66ac9dbSNicholas Bellinger int ret; 401c66ac9dbSNicholas Bellinger 402c66ac9dbSNicholas Bellinger /* 403c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 404c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 405c66ac9dbSNicholas Bellinger */ 406c66ac9dbSNicholas Bellinger if (immed) 4075787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 408c66ac9dbSNicholas Bellinger 409c66ac9dbSNicholas Bellinger /* 410c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 411c66ac9dbSNicholas Bellinger */ 412a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 413c66ac9dbSNicholas Bellinger start = 0; 414c66ac9dbSNicholas Bellinger end = LLONG_MAX; 415c66ac9dbSNicholas Bellinger } else { 4160fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 417c66ac9dbSNicholas Bellinger if (cmd->data_length) 418c66ac9dbSNicholas Bellinger end = start + cmd->data_length; 419c66ac9dbSNicholas Bellinger else 420c66ac9dbSNicholas Bellinger end = LLONG_MAX; 421c66ac9dbSNicholas Bellinger } 422c66ac9dbSNicholas Bellinger 423c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 424c66ac9dbSNicholas Bellinger if (ret != 0) 4256708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 426c66ac9dbSNicholas Bellinger 4275787cacdSChristoph Hellwig if (immed) 428ad67f0d9SChristoph Hellwig return 0; 4295787cacdSChristoph Hellwig 430de103c93SChristoph Hellwig if (ret) 4315787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 432de103c93SChristoph Hellwig else 4335787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 434ad67f0d9SChristoph Hellwig 435ad67f0d9SChristoph Hellwig return 0; 436c66ac9dbSNicholas Bellinger } 437c66ac9dbSNicholas Bellinger 4387b745c84SNicholas Bellinger static unsigned char * 4397b745c84SNicholas Bellinger fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 4407b745c84SNicholas Bellinger unsigned int len) 4417b745c84SNicholas Bellinger { 4427b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4437b745c84SNicholas Bellinger unsigned int block_size = se_dev->dev_attrib.block_size; 4447b745c84SNicholas Bellinger unsigned int i = 0, end; 4457b745c84SNicholas Bellinger unsigned char *buf, *p, *kmap_buf; 4467b745c84SNicholas Bellinger 4477b745c84SNicholas Bellinger buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 4487b745c84SNicholas Bellinger if (!buf) { 4497b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same buf\n"); 4507b745c84SNicholas Bellinger return NULL; 4517b745c84SNicholas Bellinger } 4527b745c84SNicholas Bellinger 4537b745c84SNicholas Bellinger kmap_buf = kmap(sg_page(sg)) + sg->offset; 4547b745c84SNicholas Bellinger if (!kmap_buf) { 4557b745c84SNicholas Bellinger pr_err("kmap() failed in fd_setup_write_same\n"); 4567b745c84SNicholas Bellinger kfree(buf); 4577b745c84SNicholas Bellinger return NULL; 4587b745c84SNicholas Bellinger } 4597b745c84SNicholas Bellinger /* 4607b745c84SNicholas Bellinger * Fill local *buf to contain multiple WRITE_SAME blocks up to 4617b745c84SNicholas Bellinger * min(len, PAGE_SIZE) 4627b745c84SNicholas Bellinger */ 4637b745c84SNicholas Bellinger p = buf; 4647b745c84SNicholas Bellinger end = min_t(unsigned int, len, PAGE_SIZE); 4657b745c84SNicholas Bellinger 4667b745c84SNicholas Bellinger while (i < end) { 4677b745c84SNicholas Bellinger memcpy(p, kmap_buf, block_size); 4687b745c84SNicholas Bellinger 4697b745c84SNicholas Bellinger i += block_size; 4707b745c84SNicholas Bellinger p += block_size; 4717b745c84SNicholas Bellinger } 4727b745c84SNicholas Bellinger kunmap(sg_page(sg)); 4737b745c84SNicholas Bellinger 4747b745c84SNicholas Bellinger return buf; 4757b745c84SNicholas Bellinger } 4767b745c84SNicholas Bellinger 4777b745c84SNicholas Bellinger static sense_reason_t 4787b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 4797b745c84SNicholas Bellinger { 4807b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4817b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 4827b745c84SNicholas Bellinger struct file *f = fd_dev->fd_file; 4837b745c84SNicholas Bellinger struct scatterlist *sg; 4847b745c84SNicholas Bellinger struct iovec *iov; 4857b745c84SNicholas Bellinger mm_segment_t old_fs; 486972b29c8SRoland Dreier sector_t nolb = sbc_get_write_same_sectors(cmd); 4877b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 4887b745c84SNicholas Bellinger unsigned int len, len_tmp, iov_num; 4897b745c84SNicholas Bellinger int i, rc; 4907b745c84SNicholas Bellinger unsigned char *buf; 4917b745c84SNicholas Bellinger 4927b745c84SNicholas Bellinger if (!nolb) { 4937b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4947b745c84SNicholas Bellinger return 0; 4957b745c84SNicholas Bellinger } 4967b745c84SNicholas Bellinger sg = &cmd->t_data_sg[0]; 4977b745c84SNicholas Bellinger 4987b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 4997b745c84SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 5007b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 5017b745c84SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 5027b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 5037b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 5047b745c84SNicholas Bellinger } 5057b745c84SNicholas Bellinger 5067b745c84SNicholas Bellinger len = len_tmp = nolb * se_dev->dev_attrib.block_size; 5077b745c84SNicholas Bellinger iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 5087b745c84SNicholas Bellinger 5097b745c84SNicholas Bellinger buf = fd_setup_write_same_buf(cmd, sg, len); 5107b745c84SNicholas Bellinger if (!buf) 5117b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 5127b745c84SNicholas Bellinger 5137b745c84SNicholas Bellinger iov = vzalloc(sizeof(struct iovec) * iov_num); 5147b745c84SNicholas Bellinger if (!iov) { 5157b745c84SNicholas Bellinger pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 5167b745c84SNicholas Bellinger kfree(buf); 5177b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 5187b745c84SNicholas Bellinger } 5197b745c84SNicholas Bellinger /* 5207b745c84SNicholas Bellinger * Map the single fabric received scatterlist block now populated 5217b745c84SNicholas Bellinger * in *buf into each iovec for I/O submission. 5227b745c84SNicholas Bellinger */ 5237b745c84SNicholas Bellinger for (i = 0; i < iov_num; i++) { 5247b745c84SNicholas Bellinger iov[i].iov_base = buf; 5257b745c84SNicholas Bellinger iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 5267b745c84SNicholas Bellinger len_tmp -= iov[i].iov_len; 5277b745c84SNicholas Bellinger } 5287b745c84SNicholas Bellinger 5297b745c84SNicholas Bellinger old_fs = get_fs(); 5307b745c84SNicholas Bellinger set_fs(get_ds()); 5317b745c84SNicholas Bellinger rc = vfs_writev(f, &iov[0], iov_num, &pos); 5327b745c84SNicholas Bellinger set_fs(old_fs); 5337b745c84SNicholas Bellinger 5347b745c84SNicholas Bellinger vfree(iov); 5357b745c84SNicholas Bellinger kfree(buf); 5367b745c84SNicholas Bellinger 5377b745c84SNicholas Bellinger if (rc < 0 || rc != len) { 5387b745c84SNicholas Bellinger pr_err("vfs_writev() returned %d for write same\n", rc); 5397b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 5407b745c84SNicholas Bellinger } 5417b745c84SNicholas Bellinger 5427b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 5437b745c84SNicholas Bellinger return 0; 5447b745c84SNicholas Bellinger } 5457b745c84SNicholas Bellinger 546de103c93SChristoph Hellwig static sense_reason_t 54786d71829SAsias He fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 54870d3ae5cSAsias He { 54986d71829SAsias He struct file *file = priv; 55070d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 55170d3ae5cSAsias He int ret; 55270d3ae5cSAsias He 55370d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 55470d3ae5cSAsias He /* The backend is block device, use discard */ 55570d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 55670d3ae5cSAsias He 55743f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 55870d3ae5cSAsias He nolb, GFP_KERNEL, 0); 55970d3ae5cSAsias He if (ret < 0) { 56070d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 56170d3ae5cSAsias He ret); 56270d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 56370d3ae5cSAsias He } 56470d3ae5cSAsias He } else { 56570d3ae5cSAsias He /* The backend is normal file, use fallocate */ 56643f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 56743f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 56870d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 56970d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 57070d3ae5cSAsias He 57170d3ae5cSAsias He if (!file->f_op->fallocate) 57270d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57370d3ae5cSAsias He 57470d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 57570d3ae5cSAsias He if (ret < 0) { 57670d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 57770d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57870d3ae5cSAsias He } 57970d3ae5cSAsias He } 58070d3ae5cSAsias He 58143f55bbbSAsias He return 0; 58243f55bbbSAsias He } 58343f55bbbSAsias He 58443f55bbbSAsias He static sense_reason_t 58543f55bbbSAsias He fd_execute_write_same_unmap(struct se_cmd *cmd) 58643f55bbbSAsias He { 58743f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 58843f55bbbSAsias He struct fd_dev *fd_dev = FD_DEV(se_dev); 58943f55bbbSAsias He struct file *file = fd_dev->fd_file; 59043f55bbbSAsias He sector_t lba = cmd->t_task_lba; 59143f55bbbSAsias He sector_t nolb = sbc_get_write_same_sectors(cmd); 59243f55bbbSAsias He int ret; 59343f55bbbSAsias He 59443f55bbbSAsias He if (!nolb) { 59543f55bbbSAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 59643f55bbbSAsias He return 0; 59743f55bbbSAsias He } 59843f55bbbSAsias He 59943f55bbbSAsias He ret = fd_do_unmap(cmd, file, lba, nolb); 60043f55bbbSAsias He if (ret) 60143f55bbbSAsias He return ret; 60243f55bbbSAsias He 60370d3ae5cSAsias He target_complete_cmd(cmd, GOOD); 60470d3ae5cSAsias He return 0; 60570d3ae5cSAsias He } 60670d3ae5cSAsias He 60770d3ae5cSAsias He static sense_reason_t 60850642762SAsias He fd_execute_unmap(struct se_cmd *cmd) 60950642762SAsias He { 61086d71829SAsias He struct file *file = FD_DEV(cmd->se_dev)->fd_file; 61150642762SAsias He 61286d71829SAsias He return sbc_execute_unmap(cmd, fd_do_unmap, file); 61350642762SAsias He } 61450642762SAsias He 61550642762SAsias He static sense_reason_t 616a82a9538SNicholas Bellinger fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 617a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 618c66ac9dbSNicholas Bellinger { 619c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 62042201b55SNicholas Bellinger struct fd_prot fd_prot; 62142201b55SNicholas Bellinger sense_reason_t rc; 622c66ac9dbSNicholas Bellinger int ret = 0; 623c66ac9dbSNicholas Bellinger 624c66ac9dbSNicholas Bellinger /* 625c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 626c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 627c66ac9dbSNicholas Bellinger */ 6285787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 62942201b55SNicholas Bellinger memset(&fd_prot, 0, sizeof(struct fd_prot)); 63042201b55SNicholas Bellinger 63142201b55SNicholas Bellinger if (cmd->prot_type) { 63242201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, false); 63342201b55SNicholas Bellinger if (ret < 0) 63442201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 63542201b55SNicholas Bellinger } 63642201b55SNicholas Bellinger 637778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 63842201b55SNicholas Bellinger 63942201b55SNicholas Bellinger if (ret > 0 && cmd->prot_type) { 64042201b55SNicholas Bellinger u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 64142201b55SNicholas Bellinger 64242201b55SNicholas Bellinger rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 64342201b55SNicholas Bellinger 0, fd_prot.prot_sg, 0); 64442201b55SNicholas Bellinger if (rc) { 64542201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 64642201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 64742201b55SNicholas Bellinger return rc; 64842201b55SNicholas Bellinger } 64942201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 65042201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 65142201b55SNicholas Bellinger } 652c66ac9dbSNicholas Bellinger } else { 65342201b55SNicholas Bellinger memset(&fd_prot, 0, sizeof(struct fd_prot)); 65442201b55SNicholas Bellinger 65542201b55SNicholas Bellinger if (cmd->prot_type) { 65642201b55SNicholas Bellinger u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 65742201b55SNicholas Bellinger 65842201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, false); 65942201b55SNicholas Bellinger if (ret < 0) 66042201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 66142201b55SNicholas Bellinger 66242201b55SNicholas Bellinger rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 66342201b55SNicholas Bellinger 0, fd_prot.prot_sg, 0); 66442201b55SNicholas Bellinger if (rc) { 66542201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 66642201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 66742201b55SNicholas Bellinger return rc; 66842201b55SNicholas Bellinger } 66942201b55SNicholas Bellinger } 67042201b55SNicholas Bellinger 671778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 672a4dff304SNicholas Bellinger /* 673125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 674a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 675a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 676a4dff304SNicholas Bellinger */ 677c66ac9dbSNicholas Bellinger if (ret > 0 && 6780fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_fua_write > 0 && 6792d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 6800fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 681a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 6820fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 683a4dff304SNicholas Bellinger loff_t end = start + cmd->data_length; 684c66ac9dbSNicholas Bellinger 685a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 686a4dff304SNicholas Bellinger } 687c66ac9dbSNicholas Bellinger 68842201b55SNicholas Bellinger if (ret > 0 && cmd->prot_type) { 68942201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, true); 690de103c93SChristoph Hellwig if (ret < 0) 691de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 69242201b55SNicholas Bellinger } 69342201b55SNicholas Bellinger } 69442201b55SNicholas Bellinger 69542201b55SNicholas Bellinger if (ret < 0) { 69642201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 69742201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 69842201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 69942201b55SNicholas Bellinger } 700de103c93SChristoph Hellwig 7015787cacdSChristoph Hellwig if (ret) 7025787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 70303e98c9eSNicholas Bellinger return 0; 704c66ac9dbSNicholas Bellinger } 705c66ac9dbSNicholas Bellinger 706c66ac9dbSNicholas Bellinger enum { 707c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 708c66ac9dbSNicholas Bellinger }; 709c66ac9dbSNicholas Bellinger 710c66ac9dbSNicholas Bellinger static match_table_t tokens = { 711c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 712c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 713b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 714c66ac9dbSNicholas Bellinger {Opt_err, NULL} 715c66ac9dbSNicholas Bellinger }; 716c66ac9dbSNicholas Bellinger 7170fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 718c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 719c66ac9dbSNicholas Bellinger { 7200fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 721c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 722c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 723b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 724c66ac9dbSNicholas Bellinger 725c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 726c66ac9dbSNicholas Bellinger if (!opts) 727c66ac9dbSNicholas Bellinger return -ENOMEM; 728c66ac9dbSNicholas Bellinger 729c66ac9dbSNicholas Bellinger orig = opts; 730c66ac9dbSNicholas Bellinger 73190c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 732c66ac9dbSNicholas Bellinger if (!*ptr) 733c66ac9dbSNicholas Bellinger continue; 734c66ac9dbSNicholas Bellinger 735c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 736c66ac9dbSNicholas Bellinger switch (token) { 737c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 738dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 739dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 740dbc6e022SAl Viro ret = -EINVAL; 7416d180253SJesper Juhl break; 7426d180253SJesper Juhl } 7436708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 744c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 745c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 746c66ac9dbSNicholas Bellinger break; 747c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 748c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 7496d180253SJesper Juhl if (!arg_p) { 7506d180253SJesper Juhl ret = -ENOMEM; 7516d180253SJesper Juhl break; 7526d180253SJesper Juhl } 75357103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 7546d180253SJesper Juhl kfree(arg_p); 755c66ac9dbSNicholas Bellinger if (ret < 0) { 75657103d7fSJingoo Han pr_err("kstrtoull() failed for" 757c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 758c66ac9dbSNicholas Bellinger goto out; 759c66ac9dbSNicholas Bellinger } 7606708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 761c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 762c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 763c66ac9dbSNicholas Bellinger break; 764b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 765ce31c1b0SJoern Engel ret = match_int(args, &arg); 766ce31c1b0SJoern Engel if (ret) 767ce31c1b0SJoern Engel goto out; 768b32f4c7eSNicholas Bellinger if (arg != 1) { 769b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 770b32f4c7eSNicholas Bellinger ret = -EINVAL; 771b32f4c7eSNicholas Bellinger goto out; 772b32f4c7eSNicholas Bellinger } 773b32f4c7eSNicholas Bellinger 774b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 775b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 776b32f4c7eSNicholas Bellinger 777b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 778b32f4c7eSNicholas Bellinger break; 779c66ac9dbSNicholas Bellinger default: 780c66ac9dbSNicholas Bellinger break; 781c66ac9dbSNicholas Bellinger } 782c66ac9dbSNicholas Bellinger } 783c66ac9dbSNicholas Bellinger 784c66ac9dbSNicholas Bellinger out: 785c66ac9dbSNicholas Bellinger kfree(orig); 786c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 787c66ac9dbSNicholas Bellinger } 788c66ac9dbSNicholas Bellinger 7890fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 790c66ac9dbSNicholas Bellinger { 7910fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 792c66ac9dbSNicholas Bellinger ssize_t bl = 0; 793c66ac9dbSNicholas Bellinger 794c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 795b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 796b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 797b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 798b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 799c66ac9dbSNicholas Bellinger return bl; 800c66ac9dbSNicholas Bellinger } 801c66ac9dbSNicholas Bellinger 802c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 803c66ac9dbSNicholas Bellinger { 8040fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 805cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 806cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 807cd9323fdSNicholas Bellinger unsigned long long dev_size; 808cd9323fdSNicholas Bellinger /* 809cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 810cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 811cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 812cd9323fdSNicholas Bellinger */ 813cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 81421363ca8SNicholas Bellinger dev_size = i_size_read(i); 815cd9323fdSNicholas Bellinger else 816cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 817c66ac9dbSNicholas Bellinger 81821363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 81921363ca8SNicholas Bellinger dev->dev_attrib.block_size); 820c66ac9dbSNicholas Bellinger } 821c66ac9dbSNicholas Bellinger 8220f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 8230f5e2ec4SNicholas Bellinger { 8240f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8250f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 8260f5e2ec4SNicholas Bellinger struct inode *inode; 8270f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 8280f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 8290f5e2ec4SNicholas Bellinger 8300f5e2ec4SNicholas Bellinger if (!file) { 8310f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 8320f5e2ec4SNicholas Bellinger return -ENODEV; 8330f5e2ec4SNicholas Bellinger } 8340f5e2ec4SNicholas Bellinger 8350f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 8360f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 8370f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 8380f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 8390f5e2ec4SNicholas Bellinger return -ENOSYS; 8400f5e2ec4SNicholas Bellinger } 8410f5e2ec4SNicholas Bellinger 8420f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 8430f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 8440f5e2ec4SNicholas Bellinger 8450f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 8460f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 8470f5e2ec4SNicholas Bellinger 8480f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 8490f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 8500f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 8510f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 8520f5e2ec4SNicholas Bellinger return ret; 8530f5e2ec4SNicholas Bellinger } 8540f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 8550f5e2ec4SNicholas Bellinger 8560f5e2ec4SNicholas Bellinger return 0; 8570f5e2ec4SNicholas Bellinger } 8580f5e2ec4SNicholas Bellinger 8590f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 8600f5e2ec4SNicholas Bellinger { 8610f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8620f5e2ec4SNicholas Bellinger struct file *prot_fd = fd_dev->fd_prot_file; 8630f5e2ec4SNicholas Bellinger sector_t prot_length, prot; 8640f5e2ec4SNicholas Bellinger unsigned char *buf; 8650f5e2ec4SNicholas Bellinger loff_t pos = 0; 8660f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 8670f5e2ec4SNicholas Bellinger int rc, ret = 0, size, len; 8680f5e2ec4SNicholas Bellinger 8690f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 8700f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 8710f5e2ec4SNicholas Bellinger return -ENODEV; 8720f5e2ec4SNicholas Bellinger } 8730f5e2ec4SNicholas Bellinger if (!prot_fd) { 8740f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_prot_file\n"); 8750f5e2ec4SNicholas Bellinger return -ENODEV; 8760f5e2ec4SNicholas Bellinger } 8770f5e2ec4SNicholas Bellinger 8780f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 8790f5e2ec4SNicholas Bellinger if (!buf) { 8800f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 8810f5e2ec4SNicholas Bellinger return -ENOMEM; 8820f5e2ec4SNicholas Bellinger } 8830f5e2ec4SNicholas Bellinger prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length; 8840f5e2ec4SNicholas Bellinger size = prot_length; 8850f5e2ec4SNicholas Bellinger 8860f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 8870f5e2ec4SNicholas Bellinger (unsigned long long)prot_length); 8880f5e2ec4SNicholas Bellinger 88980dcd0c1SSagi Grimberg memset(buf, 0xff, unit_size); 8900f5e2ec4SNicholas Bellinger for (prot = 0; prot < prot_length; prot += unit_size) { 8910f5e2ec4SNicholas Bellinger len = min(unit_size, size); 8920f5e2ec4SNicholas Bellinger rc = kernel_write(prot_fd, buf, len, pos); 8930f5e2ec4SNicholas Bellinger if (rc != len) { 8940f5e2ec4SNicholas Bellinger pr_err("vfs_write to prot file failed: %d\n", rc); 8950f5e2ec4SNicholas Bellinger ret = -ENODEV; 8960f5e2ec4SNicholas Bellinger goto out; 8970f5e2ec4SNicholas Bellinger } 8980f5e2ec4SNicholas Bellinger pos += len; 8990f5e2ec4SNicholas Bellinger size -= len; 9000f5e2ec4SNicholas Bellinger } 9010f5e2ec4SNicholas Bellinger 9020f5e2ec4SNicholas Bellinger out: 9030f5e2ec4SNicholas Bellinger vfree(buf); 9040f5e2ec4SNicholas Bellinger return ret; 9050f5e2ec4SNicholas Bellinger } 9060f5e2ec4SNicholas Bellinger 9070f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 9080f5e2ec4SNicholas Bellinger { 9090f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 9100f5e2ec4SNicholas Bellinger 9110f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 9120f5e2ec4SNicholas Bellinger return; 9130f5e2ec4SNicholas Bellinger 9140f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 9150f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 9160f5e2ec4SNicholas Bellinger } 9170f5e2ec4SNicholas Bellinger 9189e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 9190c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 920ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 9217b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 92270d3ae5cSAsias He .execute_write_same_unmap = fd_execute_write_same_unmap, 92350642762SAsias He .execute_unmap = fd_execute_unmap, 9240c2ad7d1SChristoph Hellwig }; 9250c2ad7d1SChristoph Hellwig 926de103c93SChristoph Hellwig static sense_reason_t 927de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 9280c2ad7d1SChristoph Hellwig { 9299e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 9300c2ad7d1SChristoph Hellwig } 9310c2ad7d1SChristoph Hellwig 932c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 933c66ac9dbSNicholas Bellinger .name = "fileio", 9340fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 9350fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 936c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 937c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 938c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 939c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 9400fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 9410fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 942c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 9430c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 944c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 945c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 9466f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 947c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 9480f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 9490f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 9500f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 951c66ac9dbSNicholas Bellinger }; 952c66ac9dbSNicholas Bellinger 953c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 954c66ac9dbSNicholas Bellinger { 955c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 956c66ac9dbSNicholas Bellinger } 957c66ac9dbSNicholas Bellinger 95863b91d5aSAsias He static void __exit fileio_module_exit(void) 959c66ac9dbSNicholas Bellinger { 960c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 961c66ac9dbSNicholas Bellinger } 962c66ac9dbSNicholas Bellinger 963c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 964c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 965c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 966c66ac9dbSNicholas Bellinger 967c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 968c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 969