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> 40b2320497SNicholas Bellinger #include <target/target_core_backend_configfs.h> 41c66ac9dbSNicholas Bellinger 42c66ac9dbSNicholas Bellinger #include "target_core_file.h" 43c66ac9dbSNicholas Bellinger 440fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev) 450fd97ccfSChristoph Hellwig { 460fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev); 470fd97ccfSChristoph Hellwig } 48c66ac9dbSNicholas Bellinger 49c66ac9dbSNicholas Bellinger /* fd_attach_hba(): (Part of se_subsystem_api_t template) 50c66ac9dbSNicholas Bellinger * 51c66ac9dbSNicholas Bellinger * 52c66ac9dbSNicholas Bellinger */ 53c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 54c66ac9dbSNicholas Bellinger { 55c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 56c66ac9dbSNicholas Bellinger 57c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 586708bb27SAndy Grover if (!fd_host) { 596708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 60e3d6f909SAndy Grover return -ENOMEM; 61c66ac9dbSNicholas Bellinger } 62c66ac9dbSNicholas Bellinger 63c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 64c66ac9dbSNicholas Bellinger 65e3d6f909SAndy Grover hba->hba_ptr = fd_host; 66c66ac9dbSNicholas Bellinger 676708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 68c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 69c66ac9dbSNicholas Bellinger TARGET_CORE_MOD_VERSION); 7095cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 7195cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id); 72c66ac9dbSNicholas Bellinger 73c66ac9dbSNicholas Bellinger return 0; 74c66ac9dbSNicholas Bellinger } 75c66ac9dbSNicholas Bellinger 76c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 77c66ac9dbSNicholas Bellinger { 78c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 79c66ac9dbSNicholas Bellinger 806708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 81c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 82c66ac9dbSNicholas Bellinger 83c66ac9dbSNicholas Bellinger kfree(fd_host); 84c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 85c66ac9dbSNicholas Bellinger } 86c66ac9dbSNicholas Bellinger 870fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 88c66ac9dbSNicholas Bellinger { 89c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 908359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 91c66ac9dbSNicholas Bellinger 92c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 936708bb27SAndy Grover if (!fd_dev) { 946708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 95c66ac9dbSNicholas Bellinger return NULL; 96c66ac9dbSNicholas Bellinger } 97c66ac9dbSNicholas Bellinger 98c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 99c66ac9dbSNicholas Bellinger 1006708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 101c66ac9dbSNicholas Bellinger 1020fd97ccfSChristoph Hellwig return &fd_dev->dev; 103c66ac9dbSNicholas Bellinger } 104c66ac9dbSNicholas Bellinger 1050fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 106c66ac9dbSNicholas Bellinger { 1070fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1080fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 109c66ac9dbSNicholas Bellinger struct file *file; 110c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1110fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 112c66ac9dbSNicholas Bellinger 1130fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1140fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1150fd97ccfSChristoph Hellwig return -EINVAL; 1160fd97ccfSChristoph Hellwig } 117c66ac9dbSNicholas Bellinger 118c66ac9dbSNicholas Bellinger /* 119a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 120a4dff304SNicholas Bellinger * of pure timestamp updates. 121c66ac9dbSNicholas Bellinger */ 122a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1230fd97ccfSChristoph Hellwig 124b32f4c7eSNicholas Bellinger /* 125b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 126b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 127b32f4c7eSNicholas Bellinger * 128b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 129b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 130b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 131b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 132b32f4c7eSNicholas Bellinger */ 133b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 134b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 135b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 136b32f4c7eSNicholas Bellinger } 137c66ac9dbSNicholas Bellinger 138dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 139613640e4SNicholas Bellinger if (IS_ERR(file)) { 140dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 141613640e4SNicholas Bellinger ret = PTR_ERR(file); 142613640e4SNicholas Bellinger goto fail; 143613640e4SNicholas Bellinger } 144c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 145c66ac9dbSNicholas Bellinger /* 146c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 147c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 148c66ac9dbSNicholas Bellinger * 149c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 150c66ac9dbSNicholas Bellinger */ 151c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 152c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1530fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 154cd9323fdSNicholas Bellinger unsigned long long dev_size; 1550fd97ccfSChristoph Hellwig 15621363ca8SNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 157c66ac9dbSNicholas Bellinger /* 158c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 159c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 160c66ac9dbSNicholas Bellinger */ 161cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 162c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 163c66ac9dbSNicholas Bellinger 1646708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 165c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 166cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 167c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 16870d3ae5cSAsias He /* 16970d3ae5cSAsias He * Check if the underlying struct block_device request_queue supports 17070d3ae5cSAsias He * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 17170d3ae5cSAsias He * in ATA and we need to set TPE=1 17270d3ae5cSAsias He */ 17370d3ae5cSAsias He if (blk_queue_discard(q)) { 17470d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 17570d3ae5cSAsias He q->limits.max_discard_sectors; 17670d3ae5cSAsias He /* 17770d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 17870d3ae5cSAsias He */ 17970d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 18070d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 18170d3ae5cSAsias He q->limits.discard_granularity >> 9; 18270d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 18370d3ae5cSAsias He q->limits.discard_alignment; 18470d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 18570d3ae5cSAsias He " disabled by default\n"); 18670d3ae5cSAsias He } 18770d3ae5cSAsias He /* 18870d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 18970d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 19070d3ae5cSAsias He */ 19170d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1920463a3feSAsias He 1930463a3feSAsias He if (blk_queue_nonrot(q)) 1940463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 195c66ac9dbSNicholas Bellinger } else { 196c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1976708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 198c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 199c66ac9dbSNicholas Bellinger " block_device\n"); 200c66ac9dbSNicholas Bellinger goto fail; 201c66ac9dbSNicholas Bellinger } 202c66ac9dbSNicholas Bellinger 20321363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 20470d3ae5cSAsias He /* 20570d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 20670d3ae5cSAsias He */ 20770d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 20870d3ae5cSAsias He /* 20970d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 21070d3ae5cSAsias He */ 21170d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 21270d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 21370d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 21470d3ae5cSAsias He 21570d3ae5cSAsias He /* 21670d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 21770d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 21870d3ae5cSAsias He */ 21970d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 220c66ac9dbSNicholas Bellinger } 221c66ac9dbSNicholas Bellinger 22221363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 22395cadaceSNicholas Bellinger dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 22495cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 2250fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 226c66ac9dbSNicholas Bellinger 227b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 228b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 229b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2300fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 231b32f4c7eSNicholas Bellinger } 232b32f4c7eSNicholas Bellinger 233c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 234c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 235c66ac9dbSNicholas Bellinger 2366708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 237c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 238c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 239c66ac9dbSNicholas Bellinger 2400fd97ccfSChristoph Hellwig return 0; 241c66ac9dbSNicholas Bellinger fail: 242c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 243c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 244c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 245c66ac9dbSNicholas Bellinger } 2460fd97ccfSChristoph Hellwig return ret; 247c66ac9dbSNicholas Bellinger } 248c66ac9dbSNicholas Bellinger 2490fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 250c66ac9dbSNicholas Bellinger { 2510fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 252c66ac9dbSNicholas Bellinger 253c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 254c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 255c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 256c66ac9dbSNicholas Bellinger } 257c66ac9dbSNicholas Bellinger 258c66ac9dbSNicholas Bellinger kfree(fd_dev); 259c66ac9dbSNicholas Bellinger } 260c66ac9dbSNicholas Bellinger 26142201b55SNicholas Bellinger static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, 26242201b55SNicholas Bellinger int is_write) 26342201b55SNicholas Bellinger { 26442201b55SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 26542201b55SNicholas Bellinger struct fd_dev *dev = FD_DEV(se_dev); 26642201b55SNicholas Bellinger struct file *prot_fd = dev->fd_prot_file; 26742201b55SNicholas Bellinger struct scatterlist *sg; 26842201b55SNicholas Bellinger loff_t pos = (cmd->t_task_lba * se_dev->prot_length); 26942201b55SNicholas Bellinger unsigned char *buf; 27042201b55SNicholas Bellinger u32 prot_size, len, size; 27142201b55SNicholas Bellinger int rc, ret = 1, i; 27242201b55SNicholas Bellinger 27342201b55SNicholas Bellinger prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) * 27442201b55SNicholas Bellinger se_dev->prot_length; 27542201b55SNicholas Bellinger 27642201b55SNicholas Bellinger if (!is_write) { 27742201b55SNicholas Bellinger fd_prot->prot_buf = vzalloc(prot_size); 27842201b55SNicholas Bellinger if (!fd_prot->prot_buf) { 27942201b55SNicholas Bellinger pr_err("Unable to allocate fd_prot->prot_buf\n"); 28042201b55SNicholas Bellinger return -ENOMEM; 28142201b55SNicholas Bellinger } 28242201b55SNicholas Bellinger buf = fd_prot->prot_buf; 28342201b55SNicholas Bellinger 28442201b55SNicholas Bellinger fd_prot->prot_sg_nents = cmd->t_prot_nents; 28542201b55SNicholas Bellinger fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) * 28642201b55SNicholas Bellinger fd_prot->prot_sg_nents, GFP_KERNEL); 28742201b55SNicholas Bellinger if (!fd_prot->prot_sg) { 28842201b55SNicholas Bellinger pr_err("Unable to allocate fd_prot->prot_sg\n"); 28942201b55SNicholas Bellinger vfree(fd_prot->prot_buf); 29042201b55SNicholas Bellinger return -ENOMEM; 29142201b55SNicholas Bellinger } 29242201b55SNicholas Bellinger size = prot_size; 29342201b55SNicholas Bellinger 29442201b55SNicholas Bellinger for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) { 29542201b55SNicholas Bellinger 29642201b55SNicholas Bellinger len = min_t(u32, PAGE_SIZE, size); 29742201b55SNicholas Bellinger sg_set_buf(sg, buf, len); 29842201b55SNicholas Bellinger size -= len; 29942201b55SNicholas Bellinger buf += len; 30042201b55SNicholas Bellinger } 30142201b55SNicholas Bellinger } 30242201b55SNicholas Bellinger 30342201b55SNicholas Bellinger if (is_write) { 30442201b55SNicholas Bellinger rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos); 30542201b55SNicholas Bellinger if (rc < 0 || prot_size != rc) { 30642201b55SNicholas Bellinger pr_err("kernel_write() for fd_do_prot_rw failed:" 30742201b55SNicholas Bellinger " %d\n", rc); 30842201b55SNicholas Bellinger ret = -EINVAL; 30942201b55SNicholas Bellinger } 31042201b55SNicholas Bellinger } else { 31142201b55SNicholas Bellinger rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size); 31242201b55SNicholas Bellinger if (rc < 0) { 31342201b55SNicholas Bellinger pr_err("kernel_read() for fd_do_prot_rw failed:" 31442201b55SNicholas Bellinger " %d\n", rc); 31542201b55SNicholas Bellinger ret = -EINVAL; 31642201b55SNicholas Bellinger } 31742201b55SNicholas Bellinger } 31842201b55SNicholas Bellinger 31942201b55SNicholas Bellinger if (is_write || ret < 0) { 32042201b55SNicholas Bellinger kfree(fd_prot->prot_sg); 32142201b55SNicholas Bellinger vfree(fd_prot->prot_buf); 32242201b55SNicholas Bellinger } 32342201b55SNicholas Bellinger 32442201b55SNicholas Bellinger return ret; 32542201b55SNicholas Bellinger } 32642201b55SNicholas Bellinger 327778229afSSebastian Andrzej Siewior static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 328778229afSSebastian Andrzej Siewior u32 sgl_nents, int is_write) 329c66ac9dbSNicholas Bellinger { 3305787cacdSChristoph Hellwig struct se_device *se_dev = cmd->se_dev; 3310fd97ccfSChristoph Hellwig struct fd_dev *dev = FD_DEV(se_dev); 3326708bb27SAndy Grover struct file *fd = dev->fd_file; 3335787cacdSChristoph Hellwig struct scatterlist *sg; 3346b9a44d0SChristoph Hellwig struct iov_iter iter; 3356b9a44d0SChristoph Hellwig struct bio_vec *bvec; 3366b9a44d0SChristoph Hellwig ssize_t len = 0; 3370fd97ccfSChristoph Hellwig loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 338c66ac9dbSNicholas Bellinger int ret = 0, i; 339c66ac9dbSNicholas Bellinger 3406b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 3416b9a44d0SChristoph Hellwig if (!bvec) { 3426708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 343e3d6f909SAndy Grover return -ENOMEM; 344c66ac9dbSNicholas Bellinger } 345c66ac9dbSNicholas Bellinger 3465787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 3476b9a44d0SChristoph Hellwig bvec[i].bv_page = sg_page(sg); 3486b9a44d0SChristoph Hellwig bvec[i].bv_len = sg->length; 3496b9a44d0SChristoph Hellwig bvec[i].bv_offset = sg->offset; 3506b9a44d0SChristoph Hellwig 3516b9a44d0SChristoph Hellwig len += sg->length; 352c66ac9dbSNicholas Bellinger } 353c66ac9dbSNicholas Bellinger 3546b9a44d0SChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len); 355778229afSSebastian Andrzej Siewior if (is_write) 3566b9a44d0SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos); 357778229afSSebastian Andrzej Siewior else 3586b9a44d0SChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos); 359778229afSSebastian Andrzej Siewior 3606b9a44d0SChristoph Hellwig kfree(bvec); 361778229afSSebastian Andrzej Siewior 362778229afSSebastian Andrzej Siewior if (is_write) { 363778229afSSebastian Andrzej Siewior if (ret < 0 || ret != cmd->data_length) { 364778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 365778229afSSebastian Andrzej Siewior return (ret < 0 ? ret : -EINVAL); 366778229afSSebastian Andrzej Siewior } 367778229afSSebastian Andrzej Siewior } else { 368c66ac9dbSNicholas Bellinger /* 369c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 370c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 371c66ac9dbSNicholas Bellinger * block_device. 372c66ac9dbSNicholas Bellinger */ 373496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3745787cacdSChristoph Hellwig if (ret < 0 || ret != cmd->data_length) { 375778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 376778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 377778229afSSebastian Andrzej Siewior cmd->data_length); 378e3d6f909SAndy Grover return (ret < 0 ? ret : -EINVAL); 379c66ac9dbSNicholas Bellinger } 380c66ac9dbSNicholas Bellinger } else { 381c66ac9dbSNicholas Bellinger if (ret < 0) { 382778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 383778229afSSebastian Andrzej Siewior __func__, ret); 384e3d6f909SAndy Grover return ret; 385c66ac9dbSNicholas Bellinger } 386c66ac9dbSNicholas Bellinger } 387c66ac9dbSNicholas Bellinger } 388c66ac9dbSNicholas Bellinger return 1; 389c66ac9dbSNicholas Bellinger } 390c66ac9dbSNicholas Bellinger 391de103c93SChristoph Hellwig static sense_reason_t 392de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 393c66ac9dbSNicholas Bellinger { 394c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3950fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 396a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 397c66ac9dbSNicholas Bellinger loff_t start, end; 398c66ac9dbSNicholas Bellinger int ret; 399c66ac9dbSNicholas Bellinger 400c66ac9dbSNicholas Bellinger /* 401c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 402c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 403c66ac9dbSNicholas Bellinger */ 404c66ac9dbSNicholas Bellinger if (immed) 4055787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 406c66ac9dbSNicholas Bellinger 407c66ac9dbSNicholas Bellinger /* 408c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 409c66ac9dbSNicholas Bellinger */ 410a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 411c66ac9dbSNicholas Bellinger start = 0; 412c66ac9dbSNicholas Bellinger end = LLONG_MAX; 413c66ac9dbSNicholas Bellinger } else { 4140fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 415c66ac9dbSNicholas Bellinger if (cmd->data_length) 41662d3ab49SZach Brown end = start + cmd->data_length - 1; 417c66ac9dbSNicholas Bellinger else 418c66ac9dbSNicholas Bellinger end = LLONG_MAX; 419c66ac9dbSNicholas Bellinger } 420c66ac9dbSNicholas Bellinger 421c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 422c66ac9dbSNicholas Bellinger if (ret != 0) 4236708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 424c66ac9dbSNicholas Bellinger 4255787cacdSChristoph Hellwig if (immed) 426ad67f0d9SChristoph Hellwig return 0; 4275787cacdSChristoph Hellwig 428de103c93SChristoph Hellwig if (ret) 4295787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 430de103c93SChristoph Hellwig else 4315787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 432ad67f0d9SChristoph Hellwig 433ad67f0d9SChristoph Hellwig return 0; 434c66ac9dbSNicholas Bellinger } 435c66ac9dbSNicholas Bellinger 4367b745c84SNicholas Bellinger static sense_reason_t 4377b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 4387b745c84SNicholas Bellinger { 4397b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4407b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 4417b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 442d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 443d4c5dcacSChristoph Hellwig struct iov_iter iter; 444d4c5dcacSChristoph Hellwig struct bio_vec *bvec; 445d4c5dcacSChristoph Hellwig unsigned int len = 0, i; 446d4c5dcacSChristoph Hellwig ssize_t ret; 4477b745c84SNicholas Bellinger 4487b745c84SNicholas Bellinger if (!nolb) { 4497b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4507b745c84SNicholas Bellinger return 0; 4517b745c84SNicholas Bellinger } 452afd73f1bSNicholas Bellinger if (cmd->prot_op) { 453afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO" 454afd73f1bSNicholas Bellinger " backends not supported\n"); 455afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 456afd73f1bSNicholas Bellinger } 4577b745c84SNicholas Bellinger 4587b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 459d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 4607b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 461d4c5dcacSChristoph Hellwig " block_size: %u\n", 462d4c5dcacSChristoph Hellwig cmd->t_data_nents, 463d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length, 4647b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 4657b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4667b745c84SNicholas Bellinger } 4677b745c84SNicholas Bellinger 468d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 469d4c5dcacSChristoph Hellwig if (!bvec) 4707b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4717b745c84SNicholas Bellinger 472d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) { 473d4c5dcacSChristoph Hellwig bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 474d4c5dcacSChristoph Hellwig bvec[i].bv_len = cmd->t_data_sg[0].length; 475d4c5dcacSChristoph Hellwig bvec[i].bv_offset = cmd->t_data_sg[0].offset; 476d4c5dcacSChristoph Hellwig 477d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size; 4787b745c84SNicholas Bellinger } 4797b745c84SNicholas Bellinger 480d4c5dcacSChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len); 481d4c5dcacSChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos); 4827b745c84SNicholas Bellinger 483d4c5dcacSChristoph Hellwig kfree(bvec); 484d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) { 485d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret); 4867b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4877b745c84SNicholas Bellinger } 4887b745c84SNicholas Bellinger 4897b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4907b745c84SNicholas Bellinger return 0; 4917b745c84SNicholas Bellinger } 4927b745c84SNicholas Bellinger 493de103c93SChristoph Hellwig static sense_reason_t 49486d71829SAsias He fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 49570d3ae5cSAsias He { 49686d71829SAsias He struct file *file = priv; 49770d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 49870d3ae5cSAsias He int ret; 49970d3ae5cSAsias He 50070d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 50170d3ae5cSAsias He /* The backend is block device, use discard */ 50270d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 50370d3ae5cSAsias He 50443f55bbbSAsias He ret = blkdev_issue_discard(bdev, lba, 50570d3ae5cSAsias He nolb, GFP_KERNEL, 0); 50670d3ae5cSAsias He if (ret < 0) { 50770d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 50870d3ae5cSAsias He ret); 50970d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51070d3ae5cSAsias He } 51170d3ae5cSAsias He } else { 51270d3ae5cSAsias He /* The backend is normal file, use fallocate */ 51343f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 51443f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 51570d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 51670d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 51770d3ae5cSAsias He 51870d3ae5cSAsias He if (!file->f_op->fallocate) 51970d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 52070d3ae5cSAsias He 52170d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 52270d3ae5cSAsias He if (ret < 0) { 52370d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 52470d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 52570d3ae5cSAsias He } 52670d3ae5cSAsias He } 52770d3ae5cSAsias He 52843f55bbbSAsias He return 0; 52943f55bbbSAsias He } 53043f55bbbSAsias He 53143f55bbbSAsias He static sense_reason_t 53243f55bbbSAsias He fd_execute_write_same_unmap(struct se_cmd *cmd) 53343f55bbbSAsias He { 53443f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 53543f55bbbSAsias He struct fd_dev *fd_dev = FD_DEV(se_dev); 53643f55bbbSAsias He struct file *file = fd_dev->fd_file; 53743f55bbbSAsias He sector_t lba = cmd->t_task_lba; 53843f55bbbSAsias He sector_t nolb = sbc_get_write_same_sectors(cmd); 5393abff1e5SChristoph Hellwig sense_reason_t ret; 54043f55bbbSAsias He 54143f55bbbSAsias He if (!nolb) { 54243f55bbbSAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 54343f55bbbSAsias He return 0; 54443f55bbbSAsias He } 54543f55bbbSAsias He 54643f55bbbSAsias He ret = fd_do_unmap(cmd, file, lba, nolb); 54743f55bbbSAsias He if (ret) 54843f55bbbSAsias He return ret; 54943f55bbbSAsias He 55070d3ae5cSAsias He target_complete_cmd(cmd, GOOD); 55170d3ae5cSAsias He return 0; 55270d3ae5cSAsias He } 55370d3ae5cSAsias He 55470d3ae5cSAsias He static sense_reason_t 55550642762SAsias He fd_execute_unmap(struct se_cmd *cmd) 55650642762SAsias He { 55786d71829SAsias He struct file *file = FD_DEV(cmd->se_dev)->fd_file; 55850642762SAsias He 55986d71829SAsias He return sbc_execute_unmap(cmd, fd_do_unmap, file); 56050642762SAsias He } 56150642762SAsias He 56250642762SAsias He static sense_reason_t 563a82a9538SNicholas Bellinger fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 564a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 565c66ac9dbSNicholas Bellinger { 566c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 56742201b55SNicholas Bellinger struct fd_prot fd_prot; 56842201b55SNicholas Bellinger sense_reason_t rc; 569c66ac9dbSNicholas Bellinger int ret = 0; 570046ba642SNicholas Bellinger /* 571046ba642SNicholas Bellinger * We are currently limited by the number of iovecs (2048) per 572046ba642SNicholas Bellinger * single vfs_[writev,readv] call. 573046ba642SNicholas Bellinger */ 574046ba642SNicholas Bellinger if (cmd->data_length > FD_MAX_BYTES) { 575046ba642SNicholas Bellinger pr_err("FILEIO: Not able to process I/O of %u bytes due to" 576046ba642SNicholas Bellinger "FD_MAX_BYTES: %u iovec count limitiation\n", 577046ba642SNicholas Bellinger cmd->data_length, FD_MAX_BYTES); 578046ba642SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 579046ba642SNicholas Bellinger } 580c66ac9dbSNicholas Bellinger /* 581c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 582c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 583c66ac9dbSNicholas Bellinger */ 5845787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 58542201b55SNicholas Bellinger memset(&fd_prot, 0, sizeof(struct fd_prot)); 58642201b55SNicholas Bellinger 587ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 58842201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, false); 58942201b55SNicholas Bellinger if (ret < 0) 59042201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 59142201b55SNicholas Bellinger } 59242201b55SNicholas Bellinger 593778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 59442201b55SNicholas Bellinger 595ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 59642201b55SNicholas Bellinger u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 59742201b55SNicholas Bellinger 59842201b55SNicholas Bellinger rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 59942201b55SNicholas Bellinger 0, fd_prot.prot_sg, 0); 60042201b55SNicholas Bellinger if (rc) { 60142201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 60242201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 60342201b55SNicholas Bellinger return rc; 60442201b55SNicholas Bellinger } 60542201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 60642201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 60742201b55SNicholas Bellinger } 608c66ac9dbSNicholas Bellinger } else { 60942201b55SNicholas Bellinger memset(&fd_prot, 0, sizeof(struct fd_prot)); 61042201b55SNicholas Bellinger 611ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 61242201b55SNicholas Bellinger u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 61342201b55SNicholas Bellinger 61442201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, false); 61542201b55SNicholas Bellinger if (ret < 0) 61642201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 61742201b55SNicholas Bellinger 61842201b55SNicholas Bellinger rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 61942201b55SNicholas Bellinger 0, fd_prot.prot_sg, 0); 62042201b55SNicholas Bellinger if (rc) { 62142201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 62242201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 62342201b55SNicholas Bellinger return rc; 62442201b55SNicholas Bellinger } 62542201b55SNicholas Bellinger } 62642201b55SNicholas Bellinger 627778229afSSebastian Andrzej Siewior ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 628a4dff304SNicholas Bellinger /* 629125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 630a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 631a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 632a4dff304SNicholas Bellinger */ 633c66ac9dbSNicholas Bellinger if (ret > 0 && 6340fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_fua_write > 0 && 6352d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA)) { 6360fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 637a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 6380fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 63962d3ab49SZach Brown loff_t end; 64062d3ab49SZach Brown 64162d3ab49SZach Brown if (cmd->data_length) 64262d3ab49SZach Brown end = start + cmd->data_length - 1; 64362d3ab49SZach Brown else 64462d3ab49SZach Brown end = LLONG_MAX; 645c66ac9dbSNicholas Bellinger 646a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 647a4dff304SNicholas Bellinger } 648c66ac9dbSNicholas Bellinger 649ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 65042201b55SNicholas Bellinger ret = fd_do_prot_rw(cmd, &fd_prot, true); 651de103c93SChristoph Hellwig if (ret < 0) 652de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 65342201b55SNicholas Bellinger } 65442201b55SNicholas Bellinger } 65542201b55SNicholas Bellinger 65642201b55SNicholas Bellinger if (ret < 0) { 65742201b55SNicholas Bellinger kfree(fd_prot.prot_sg); 65842201b55SNicholas Bellinger vfree(fd_prot.prot_buf); 65942201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 66042201b55SNicholas Bellinger } 661de103c93SChristoph Hellwig 6625787cacdSChristoph Hellwig if (ret) 6635787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 66403e98c9eSNicholas Bellinger return 0; 665c66ac9dbSNicholas Bellinger } 666c66ac9dbSNicholas Bellinger 667c66ac9dbSNicholas Bellinger enum { 668c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 669c66ac9dbSNicholas Bellinger }; 670c66ac9dbSNicholas Bellinger 671c66ac9dbSNicholas Bellinger static match_table_t tokens = { 672c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 673c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 674b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 675c66ac9dbSNicholas Bellinger {Opt_err, NULL} 676c66ac9dbSNicholas Bellinger }; 677c66ac9dbSNicholas Bellinger 6780fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 679c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 680c66ac9dbSNicholas Bellinger { 6810fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 682c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 683c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 684b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 685c66ac9dbSNicholas Bellinger 686c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 687c66ac9dbSNicholas Bellinger if (!opts) 688c66ac9dbSNicholas Bellinger return -ENOMEM; 689c66ac9dbSNicholas Bellinger 690c66ac9dbSNicholas Bellinger orig = opts; 691c66ac9dbSNicholas Bellinger 69290c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 693c66ac9dbSNicholas Bellinger if (!*ptr) 694c66ac9dbSNicholas Bellinger continue; 695c66ac9dbSNicholas Bellinger 696c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 697c66ac9dbSNicholas Bellinger switch (token) { 698c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 699dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 700dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 701dbc6e022SAl Viro ret = -EINVAL; 7026d180253SJesper Juhl break; 7036d180253SJesper Juhl } 7046708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 705c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 706c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 707c66ac9dbSNicholas Bellinger break; 708c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 709c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 7106d180253SJesper Juhl if (!arg_p) { 7116d180253SJesper Juhl ret = -ENOMEM; 7126d180253SJesper Juhl break; 7136d180253SJesper Juhl } 71457103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 7156d180253SJesper Juhl kfree(arg_p); 716c66ac9dbSNicholas Bellinger if (ret < 0) { 71757103d7fSJingoo Han pr_err("kstrtoull() failed for" 718c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 719c66ac9dbSNicholas Bellinger goto out; 720c66ac9dbSNicholas Bellinger } 7216708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 722c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 723c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 724c66ac9dbSNicholas Bellinger break; 725b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 726ce31c1b0SJoern Engel ret = match_int(args, &arg); 727ce31c1b0SJoern Engel if (ret) 728ce31c1b0SJoern Engel goto out; 729b32f4c7eSNicholas Bellinger if (arg != 1) { 730b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 731b32f4c7eSNicholas Bellinger ret = -EINVAL; 732b32f4c7eSNicholas Bellinger goto out; 733b32f4c7eSNicholas Bellinger } 734b32f4c7eSNicholas Bellinger 735b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 736b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 737b32f4c7eSNicholas Bellinger 738b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 739b32f4c7eSNicholas Bellinger break; 740c66ac9dbSNicholas Bellinger default: 741c66ac9dbSNicholas Bellinger break; 742c66ac9dbSNicholas Bellinger } 743c66ac9dbSNicholas Bellinger } 744c66ac9dbSNicholas Bellinger 745c66ac9dbSNicholas Bellinger out: 746c66ac9dbSNicholas Bellinger kfree(orig); 747c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 748c66ac9dbSNicholas Bellinger } 749c66ac9dbSNicholas Bellinger 7500fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 751c66ac9dbSNicholas Bellinger { 7520fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 753c66ac9dbSNicholas Bellinger ssize_t bl = 0; 754c66ac9dbSNicholas Bellinger 755c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 756b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 757b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 758b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 759b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 760c66ac9dbSNicholas Bellinger return bl; 761c66ac9dbSNicholas Bellinger } 762c66ac9dbSNicholas Bellinger 763c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 764c66ac9dbSNicholas Bellinger { 7650fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 766cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 767cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 768cd9323fdSNicholas Bellinger unsigned long long dev_size; 769cd9323fdSNicholas Bellinger /* 770cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 771cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 772cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 773cd9323fdSNicholas Bellinger */ 774cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 77521363ca8SNicholas Bellinger dev_size = i_size_read(i); 776cd9323fdSNicholas Bellinger else 777cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 778c66ac9dbSNicholas Bellinger 77921363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 78021363ca8SNicholas Bellinger dev->dev_attrib.block_size); 781c66ac9dbSNicholas Bellinger } 782c66ac9dbSNicholas Bellinger 7830f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 7840f5e2ec4SNicholas Bellinger { 7850f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 7860f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 7870f5e2ec4SNicholas Bellinger struct inode *inode; 7880f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 7890f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 7900f5e2ec4SNicholas Bellinger 7910f5e2ec4SNicholas Bellinger if (!file) { 7920f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 7930f5e2ec4SNicholas Bellinger return -ENODEV; 7940f5e2ec4SNicholas Bellinger } 7950f5e2ec4SNicholas Bellinger 7960f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 7970f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 7980f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 7990f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 8000f5e2ec4SNicholas Bellinger return -ENOSYS; 8010f5e2ec4SNicholas Bellinger } 8020f5e2ec4SNicholas Bellinger 8030f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 8040f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 8050f5e2ec4SNicholas Bellinger 8060f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 8070f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 8080f5e2ec4SNicholas Bellinger 8090f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 8100f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 8110f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 8120f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 8130f5e2ec4SNicholas Bellinger return ret; 8140f5e2ec4SNicholas Bellinger } 8150f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 8160f5e2ec4SNicholas Bellinger 8170f5e2ec4SNicholas Bellinger return 0; 8180f5e2ec4SNicholas Bellinger } 8190f5e2ec4SNicholas Bellinger 8200f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 8210f5e2ec4SNicholas Bellinger { 8220f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8230f5e2ec4SNicholas Bellinger struct file *prot_fd = fd_dev->fd_prot_file; 8240f5e2ec4SNicholas Bellinger sector_t prot_length, prot; 8250f5e2ec4SNicholas Bellinger unsigned char *buf; 8260f5e2ec4SNicholas Bellinger loff_t pos = 0; 8270f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 8280f5e2ec4SNicholas Bellinger int rc, ret = 0, size, len; 8290f5e2ec4SNicholas Bellinger 8300f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 8310f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 8320f5e2ec4SNicholas Bellinger return -ENODEV; 8330f5e2ec4SNicholas Bellinger } 8340f5e2ec4SNicholas Bellinger if (!prot_fd) { 8350f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_prot_file\n"); 8360f5e2ec4SNicholas Bellinger return -ENODEV; 8370f5e2ec4SNicholas Bellinger } 8380f5e2ec4SNicholas Bellinger 8390f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 8400f5e2ec4SNicholas Bellinger if (!buf) { 8410f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 8420f5e2ec4SNicholas Bellinger return -ENOMEM; 8430f5e2ec4SNicholas Bellinger } 8440f5e2ec4SNicholas Bellinger prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length; 8450f5e2ec4SNicholas Bellinger size = prot_length; 8460f5e2ec4SNicholas Bellinger 8470f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 8480f5e2ec4SNicholas Bellinger (unsigned long long)prot_length); 8490f5e2ec4SNicholas Bellinger 85080dcd0c1SSagi Grimberg memset(buf, 0xff, unit_size); 8510f5e2ec4SNicholas Bellinger for (prot = 0; prot < prot_length; prot += unit_size) { 8520f5e2ec4SNicholas Bellinger len = min(unit_size, size); 8530f5e2ec4SNicholas Bellinger rc = kernel_write(prot_fd, buf, len, pos); 8540f5e2ec4SNicholas Bellinger if (rc != len) { 8550f5e2ec4SNicholas Bellinger pr_err("vfs_write to prot file failed: %d\n", rc); 8560f5e2ec4SNicholas Bellinger ret = -ENODEV; 8570f5e2ec4SNicholas Bellinger goto out; 8580f5e2ec4SNicholas Bellinger } 8590f5e2ec4SNicholas Bellinger pos += len; 8600f5e2ec4SNicholas Bellinger size -= len; 8610f5e2ec4SNicholas Bellinger } 8620f5e2ec4SNicholas Bellinger 8630f5e2ec4SNicholas Bellinger out: 8640f5e2ec4SNicholas Bellinger vfree(buf); 8650f5e2ec4SNicholas Bellinger return ret; 8660f5e2ec4SNicholas Bellinger } 8670f5e2ec4SNicholas Bellinger 8680f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 8690f5e2ec4SNicholas Bellinger { 8700f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8710f5e2ec4SNicholas Bellinger 8720f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 8730f5e2ec4SNicholas Bellinger return; 8740f5e2ec4SNicholas Bellinger 8750f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 8760f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 8770f5e2ec4SNicholas Bellinger } 8780f5e2ec4SNicholas Bellinger 8799e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 8800c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 881ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 8827b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 88370d3ae5cSAsias He .execute_write_same_unmap = fd_execute_write_same_unmap, 88450642762SAsias He .execute_unmap = fd_execute_unmap, 8850c2ad7d1SChristoph Hellwig }; 8860c2ad7d1SChristoph Hellwig 887de103c93SChristoph Hellwig static sense_reason_t 888de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 8890c2ad7d1SChristoph Hellwig { 8909e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 8910c2ad7d1SChristoph Hellwig } 8920c2ad7d1SChristoph Hellwig 893b2320497SNicholas Bellinger DEF_TB_DEFAULT_ATTRIBS(fileio); 894b2320497SNicholas Bellinger 895b2320497SNicholas Bellinger static struct configfs_attribute *fileio_backend_dev_attrs[] = { 896b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_model_alias.attr, 897b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_dpo.attr, 898b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_fua_write.attr, 899b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_fua_read.attr, 900b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_write_cache.attr, 901b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_ua_intlck_ctrl.attr, 902b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_tas.attr, 903b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_tpu.attr, 904b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_tpws.attr, 905b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_caw.attr, 906b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_3pc.attr, 907b2320497SNicholas Bellinger &fileio_dev_attrib_pi_prot_type.attr, 908b2320497SNicholas Bellinger &fileio_dev_attrib_hw_pi_prot_type.attr, 909b2320497SNicholas Bellinger &fileio_dev_attrib_pi_prot_format.attr, 910b2320497SNicholas Bellinger &fileio_dev_attrib_enforce_pr_isids.attr, 911b2320497SNicholas Bellinger &fileio_dev_attrib_is_nonrot.attr, 912b2320497SNicholas Bellinger &fileio_dev_attrib_emulate_rest_reord.attr, 913b2320497SNicholas Bellinger &fileio_dev_attrib_force_pr_aptpl.attr, 914b2320497SNicholas Bellinger &fileio_dev_attrib_hw_block_size.attr, 915b2320497SNicholas Bellinger &fileio_dev_attrib_block_size.attr, 916b2320497SNicholas Bellinger &fileio_dev_attrib_hw_max_sectors.attr, 917b2320497SNicholas Bellinger &fileio_dev_attrib_optimal_sectors.attr, 918b2320497SNicholas Bellinger &fileio_dev_attrib_hw_queue_depth.attr, 919b2320497SNicholas Bellinger &fileio_dev_attrib_queue_depth.attr, 920b2320497SNicholas Bellinger &fileio_dev_attrib_max_unmap_lba_count.attr, 921b2320497SNicholas Bellinger &fileio_dev_attrib_max_unmap_block_desc_count.attr, 922b2320497SNicholas Bellinger &fileio_dev_attrib_unmap_granularity.attr, 923b2320497SNicholas Bellinger &fileio_dev_attrib_unmap_granularity_alignment.attr, 924b2320497SNicholas Bellinger &fileio_dev_attrib_max_write_same_len.attr, 925b2320497SNicholas Bellinger NULL, 926b2320497SNicholas Bellinger }; 927b2320497SNicholas Bellinger 928c66ac9dbSNicholas Bellinger static struct se_subsystem_api fileio_template = { 929c66ac9dbSNicholas Bellinger .name = "fileio", 9300fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 9310fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 932c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 933c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 934c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 935c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 9360fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 9370fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 938c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 9390c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 940c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 941c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 9426f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 943c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 9440f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 9450f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 9460f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 947c66ac9dbSNicholas Bellinger }; 948c66ac9dbSNicholas Bellinger 949c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 950c66ac9dbSNicholas Bellinger { 951b2320497SNicholas Bellinger struct target_backend_cits *tbc = &fileio_template.tb_cits; 952b2320497SNicholas Bellinger 953b2320497SNicholas Bellinger target_core_setup_sub_cits(&fileio_template); 954b2320497SNicholas Bellinger tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs; 955b2320497SNicholas Bellinger 956c66ac9dbSNicholas Bellinger return transport_subsystem_register(&fileio_template); 957c66ac9dbSNicholas Bellinger } 958c66ac9dbSNicholas Bellinger 95963b91d5aSAsias He static void __exit fileio_module_exit(void) 960c66ac9dbSNicholas Bellinger { 961c66ac9dbSNicholas Bellinger transport_subsystem_release(&fileio_template); 962c66ac9dbSNicholas Bellinger } 963c66ac9dbSNicholas Bellinger 964c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 965c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 966c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 967c66ac9dbSNicholas Bellinger 968c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 969c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 970