11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2c66ac9dbSNicholas Bellinger /******************************************************************************* 3c66ac9dbSNicholas Bellinger * Filename: target_core_file.c 4c66ac9dbSNicholas Bellinger * 5c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> FILEIO transport specific functions 6c66ac9dbSNicholas Bellinger * 74c76251eSNicholas Bellinger * (c) Copyright 2005-2013 Datera, Inc. 8c66ac9dbSNicholas Bellinger * 9c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 10c66ac9dbSNicholas Bellinger * 11c66ac9dbSNicholas Bellinger ******************************************************************************/ 12c66ac9dbSNicholas Bellinger 13c66ac9dbSNicholas Bellinger #include <linux/string.h> 14c66ac9dbSNicholas Bellinger #include <linux/parser.h> 15c66ac9dbSNicholas Bellinger #include <linux/timer.h> 16c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 17c66ac9dbSNicholas Bellinger #include <linux/slab.h> 18c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 19827509e3SPaul Gortmaker #include <linux/module.h> 205538d294SDavid S. Miller #include <linux/vmalloc.h> 2170d3ae5cSAsias He #include <linux/falloc.h> 228dcf07beSBart Van Assche #include <linux/uio.h> 23ba929992SBart Van Assche #include <scsi/scsi_proto.h> 2450642762SAsias He #include <asm/unaligned.h> 25c66ac9dbSNicholas Bellinger 26c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 27c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 28c66ac9dbSNicholas Bellinger 29c66ac9dbSNicholas Bellinger #include "target_core_file.h" 30c66ac9dbSNicholas Bellinger 310fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev) 320fd97ccfSChristoph Hellwig { 330fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev); 340fd97ccfSChristoph Hellwig } 35c66ac9dbSNicholas Bellinger 36c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 37c66ac9dbSNicholas Bellinger { 38c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 39c66ac9dbSNicholas Bellinger 40c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 416708bb27SAndy Grover if (!fd_host) { 426708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 43e3d6f909SAndy Grover return -ENOMEM; 44c66ac9dbSNicholas Bellinger } 45c66ac9dbSNicholas Bellinger 46c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 47c66ac9dbSNicholas Bellinger 48e3d6f909SAndy Grover hba->hba_ptr = fd_host; 49c66ac9dbSNicholas Bellinger 506708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 51c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 52ce8dd25dSChristoph Hellwig TARGET_CORE_VERSION); 5395cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 5495cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id); 55c66ac9dbSNicholas Bellinger 56c66ac9dbSNicholas Bellinger return 0; 57c66ac9dbSNicholas Bellinger } 58c66ac9dbSNicholas Bellinger 59c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 60c66ac9dbSNicholas Bellinger { 61c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 62c66ac9dbSNicholas Bellinger 636708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 64c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 65c66ac9dbSNicholas Bellinger 66c66ac9dbSNicholas Bellinger kfree(fd_host); 67c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 68c66ac9dbSNicholas Bellinger } 69c66ac9dbSNicholas Bellinger 700fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 71c66ac9dbSNicholas Bellinger { 72c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 738359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 74c66ac9dbSNicholas Bellinger 75c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 766708bb27SAndy Grover if (!fd_dev) { 776708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 78c66ac9dbSNicholas Bellinger return NULL; 79c66ac9dbSNicholas Bellinger } 80c66ac9dbSNicholas Bellinger 81c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 82c66ac9dbSNicholas Bellinger 836708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 84c66ac9dbSNicholas Bellinger 850fd97ccfSChristoph Hellwig return &fd_dev->dev; 86c66ac9dbSNicholas Bellinger } 87c66ac9dbSNicholas Bellinger 880fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 89c66ac9dbSNicholas Bellinger { 900fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 910fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 92c66ac9dbSNicholas Bellinger struct file *file; 93c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 940fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 95c66ac9dbSNicholas Bellinger 960fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 970fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 980fd97ccfSChristoph Hellwig return -EINVAL; 990fd97ccfSChristoph Hellwig } 100c66ac9dbSNicholas Bellinger 101c66ac9dbSNicholas Bellinger /* 102a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 103a4dff304SNicholas Bellinger * of pure timestamp updates. 104c66ac9dbSNicholas Bellinger */ 105a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1060fd97ccfSChristoph Hellwig 107b32f4c7eSNicholas Bellinger /* 108b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 109b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 110b32f4c7eSNicholas Bellinger * 111b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 112b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 113b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 114b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 115b32f4c7eSNicholas Bellinger */ 116b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 117b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 118b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 119b32f4c7eSNicholas Bellinger } 120c66ac9dbSNicholas Bellinger 121dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 122613640e4SNicholas Bellinger if (IS_ERR(file)) { 123dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 124613640e4SNicholas Bellinger ret = PTR_ERR(file); 125613640e4SNicholas Bellinger goto fail; 126613640e4SNicholas Bellinger } 127c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 128c66ac9dbSNicholas Bellinger /* 129c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 130c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 131c66ac9dbSNicholas Bellinger * 132c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 133c66ac9dbSNicholas Bellinger */ 134c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 135c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1364e7b5671SChristoph Hellwig struct request_queue *q = bdev_get_queue(I_BDEV(inode)); 137cd9323fdSNicholas Bellinger unsigned long long dev_size; 1380fd97ccfSChristoph Hellwig 1394e7b5671SChristoph Hellwig fd_dev->fd_block_size = bdev_logical_block_size(I_BDEV(inode)); 140c66ac9dbSNicholas Bellinger /* 141c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 142c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 143c66ac9dbSNicholas Bellinger */ 144cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 145c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 146c66ac9dbSNicholas Bellinger 1476708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 148c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 149cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 150c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 1518a9ebe71SMike Christie 152ea263c7fSMike Christie if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) 15370d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 15470d3ae5cSAsias He " disabled by default\n"); 15570d3ae5cSAsias He /* 15670d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 15770d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 15870d3ae5cSAsias He */ 15970d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1600463a3feSAsias He 1610463a3feSAsias He if (blk_queue_nonrot(q)) 1620463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 163c66ac9dbSNicholas Bellinger } else { 164c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1656708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 166c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 167c66ac9dbSNicholas Bellinger " block_device\n"); 168c66ac9dbSNicholas Bellinger goto fail; 169c66ac9dbSNicholas Bellinger } 170c66ac9dbSNicholas Bellinger 17121363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 17270d3ae5cSAsias He /* 17370d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 17470d3ae5cSAsias He */ 17570d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 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 = 1; 18170d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 18270d3ae5cSAsias He 18370d3ae5cSAsias He /* 18470d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 18570d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 18670d3ae5cSAsias He */ 18770d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 188c66ac9dbSNicholas Bellinger } 189c66ac9dbSNicholas Bellinger 19021363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 19195cadaceSNicholas Bellinger dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 19295cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 1930fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 194c66ac9dbSNicholas Bellinger 195b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 196b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 197b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 1980fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 199b32f4c7eSNicholas Bellinger } 200b32f4c7eSNicholas Bellinger 201c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 202c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 203c66ac9dbSNicholas Bellinger 2046708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 205c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 206c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 207c66ac9dbSNicholas Bellinger 2080fd97ccfSChristoph Hellwig return 0; 209c66ac9dbSNicholas Bellinger fail: 210c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 211c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 212c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 213c66ac9dbSNicholas Bellinger } 2140fd97ccfSChristoph Hellwig return ret; 215c66ac9dbSNicholas Bellinger } 216c66ac9dbSNicholas Bellinger 2174cc987eaSNicholas Bellinger static void fd_dev_call_rcu(struct rcu_head *p) 2184cc987eaSNicholas Bellinger { 2194cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 2204cc987eaSNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 2214cc987eaSNicholas Bellinger 2224cc987eaSNicholas Bellinger kfree(fd_dev); 2234cc987eaSNicholas Bellinger } 2244cc987eaSNicholas Bellinger 2250fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 226c66ac9dbSNicholas Bellinger { 22792634706SMike Christie call_rcu(&dev->rcu_head, fd_dev_call_rcu); 22892634706SMike Christie } 22992634706SMike Christie 23092634706SMike Christie static void fd_destroy_device(struct se_device *dev) 23192634706SMike Christie { 2320fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 233c66ac9dbSNicholas Bellinger 234c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 235c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 236c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 237c66ac9dbSNicholas Bellinger } 238c66ac9dbSNicholas Bellinger } 239c66ac9dbSNicholas Bellinger 240769031c9SAndrei Vagin struct target_core_file_cmd { 241769031c9SAndrei Vagin unsigned long len; 242769031c9SAndrei Vagin struct se_cmd *cmd; 243769031c9SAndrei Vagin struct kiocb iocb; 244ecd7fba0SChristoph Hellwig struct bio_vec bvecs[]; 245769031c9SAndrei Vagin }; 246769031c9SAndrei Vagin 247769031c9SAndrei Vagin static void cmd_rw_aio_complete(struct kiocb *iocb, long ret, long ret2) 248769031c9SAndrei Vagin { 249769031c9SAndrei Vagin struct target_core_file_cmd *cmd; 250769031c9SAndrei Vagin 251769031c9SAndrei Vagin cmd = container_of(iocb, struct target_core_file_cmd, iocb); 252769031c9SAndrei Vagin 253769031c9SAndrei Vagin if (ret != cmd->len) 254769031c9SAndrei Vagin target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION); 255769031c9SAndrei Vagin else 256769031c9SAndrei Vagin target_complete_cmd(cmd->cmd, SAM_STAT_GOOD); 257769031c9SAndrei Vagin 258769031c9SAndrei Vagin kfree(cmd); 259769031c9SAndrei Vagin } 260769031c9SAndrei Vagin 261769031c9SAndrei Vagin static sense_reason_t 262769031c9SAndrei Vagin fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 263769031c9SAndrei Vagin enum dma_data_direction data_direction) 264769031c9SAndrei Vagin { 265769031c9SAndrei Vagin int is_write = !(data_direction == DMA_FROM_DEVICE); 266769031c9SAndrei Vagin struct se_device *dev = cmd->se_dev; 267769031c9SAndrei Vagin struct fd_dev *fd_dev = FD_DEV(dev); 268769031c9SAndrei Vagin struct file *file = fd_dev->fd_file; 269769031c9SAndrei Vagin struct target_core_file_cmd *aio_cmd; 2706b1dba3dSPavel Begunkov struct iov_iter iter; 271769031c9SAndrei Vagin struct scatterlist *sg; 272769031c9SAndrei Vagin ssize_t len = 0; 273769031c9SAndrei Vagin int ret = 0, i; 274769031c9SAndrei Vagin 275ecd7fba0SChristoph Hellwig aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL); 276769031c9SAndrei Vagin if (!aio_cmd) 277769031c9SAndrei Vagin return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 278769031c9SAndrei Vagin 279769031c9SAndrei Vagin for_each_sg(sgl, sg, sgl_nents, i) { 280ecd7fba0SChristoph Hellwig aio_cmd->bvecs[i].bv_page = sg_page(sg); 281ecd7fba0SChristoph Hellwig aio_cmd->bvecs[i].bv_len = sg->length; 282ecd7fba0SChristoph Hellwig aio_cmd->bvecs[i].bv_offset = sg->offset; 283769031c9SAndrei Vagin 284769031c9SAndrei Vagin len += sg->length; 285769031c9SAndrei Vagin } 286769031c9SAndrei Vagin 287ecd7fba0SChristoph Hellwig iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len); 288769031c9SAndrei Vagin 289769031c9SAndrei Vagin aio_cmd->cmd = cmd; 290769031c9SAndrei Vagin aio_cmd->len = len; 291769031c9SAndrei Vagin aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size; 292769031c9SAndrei Vagin aio_cmd->iocb.ki_filp = file; 293769031c9SAndrei Vagin aio_cmd->iocb.ki_complete = cmd_rw_aio_complete; 294769031c9SAndrei Vagin aio_cmd->iocb.ki_flags = IOCB_DIRECT; 295769031c9SAndrei Vagin 296769031c9SAndrei Vagin if (is_write && (cmd->se_cmd_flags & SCF_FUA)) 297769031c9SAndrei Vagin aio_cmd->iocb.ki_flags |= IOCB_DSYNC; 298769031c9SAndrei Vagin 299769031c9SAndrei Vagin if (is_write) 300769031c9SAndrei Vagin ret = call_write_iter(file, &aio_cmd->iocb, &iter); 301769031c9SAndrei Vagin else 302769031c9SAndrei Vagin ret = call_read_iter(file, &aio_cmd->iocb, &iter); 303769031c9SAndrei Vagin 304769031c9SAndrei Vagin if (ret != -EIOCBQUEUED) 305769031c9SAndrei Vagin cmd_rw_aio_complete(&aio_cmd->iocb, ret, 0); 306769031c9SAndrei Vagin 307769031c9SAndrei Vagin return 0; 308769031c9SAndrei Vagin } 309769031c9SAndrei Vagin 3108287fa5fSSagi Grimberg static int fd_do_rw(struct se_cmd *cmd, struct file *fd, 3118287fa5fSSagi Grimberg u32 block_size, struct scatterlist *sgl, 3128287fa5fSSagi Grimberg u32 sgl_nents, u32 data_length, int is_write) 31342201b55SNicholas Bellinger { 3145787cacdSChristoph Hellwig struct scatterlist *sg; 3156b9a44d0SChristoph Hellwig struct iov_iter iter; 3166b9a44d0SChristoph Hellwig struct bio_vec *bvec; 3176b9a44d0SChristoph Hellwig ssize_t len = 0; 3188287fa5fSSagi Grimberg loff_t pos = (cmd->t_task_lba * block_size); 319c66ac9dbSNicholas Bellinger int ret = 0, i; 320c66ac9dbSNicholas Bellinger 3216b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 3226b9a44d0SChristoph Hellwig if (!bvec) { 3236708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 324e3d6f909SAndy Grover return -ENOMEM; 325c66ac9dbSNicholas Bellinger } 326c66ac9dbSNicholas Bellinger 3275787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 3286b9a44d0SChristoph Hellwig bvec[i].bv_page = sg_page(sg); 3296b9a44d0SChristoph Hellwig bvec[i].bv_len = sg->length; 3306b9a44d0SChristoph Hellwig bvec[i].bv_offset = sg->offset; 3316b9a44d0SChristoph Hellwig 3326b9a44d0SChristoph Hellwig len += sg->length; 333c66ac9dbSNicholas Bellinger } 334c66ac9dbSNicholas Bellinger 335aa563d7bSDavid Howells iov_iter_bvec(&iter, READ, bvec, sgl_nents, len); 336778229afSSebastian Andrzej Siewior if (is_write) 337abbb6589SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos, 0); 338778229afSSebastian Andrzej Siewior else 33918e9710eSChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos, 0); 340778229afSSebastian Andrzej Siewior 341778229afSSebastian Andrzej Siewior if (is_write) { 3428287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 343778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 344f11b55d1SDmitry Monakhov if (ret >= 0) 345f11b55d1SDmitry Monakhov ret = -EINVAL; 346778229afSSebastian Andrzej Siewior } 347778229afSSebastian Andrzej Siewior } else { 348c66ac9dbSNicholas Bellinger /* 349c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 350c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 351c66ac9dbSNicholas Bellinger * block_device. 352c66ac9dbSNicholas Bellinger */ 353496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 3548287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 355778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 356778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 3578287fa5fSSagi Grimberg data_length); 358f11b55d1SDmitry Monakhov if (ret >= 0) 359f11b55d1SDmitry Monakhov ret = -EINVAL; 360c66ac9dbSNicholas Bellinger } 361c66ac9dbSNicholas Bellinger } else { 362c66ac9dbSNicholas Bellinger if (ret < 0) { 363778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 364778229afSSebastian Andrzej Siewior __func__, ret); 365f11b55d1SDmitry Monakhov } else if (ret != data_length) { 366f11b55d1SDmitry Monakhov /* 367f11b55d1SDmitry Monakhov * Short read case: 368f11b55d1SDmitry Monakhov * Probably some one truncate file under us. 369f11b55d1SDmitry Monakhov * We must explicitly zero sg-pages to prevent 370f11b55d1SDmitry Monakhov * expose uninizialized pages to userspace. 371f11b55d1SDmitry Monakhov */ 372f11b55d1SDmitry Monakhov if (ret < data_length) 373f11b55d1SDmitry Monakhov ret += iov_iter_zero(data_length - ret, &iter); 374f11b55d1SDmitry Monakhov else 375f11b55d1SDmitry Monakhov ret = -EINVAL; 376f11b55d1SDmitry Monakhov } 377f11b55d1SDmitry Monakhov } 378f11b55d1SDmitry Monakhov } 379f11b55d1SDmitry Monakhov kfree(bvec); 380e3d6f909SAndy Grover return ret; 381c66ac9dbSNicholas Bellinger } 382c66ac9dbSNicholas Bellinger 383de103c93SChristoph Hellwig static sense_reason_t 384de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 385c66ac9dbSNicholas Bellinger { 386c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3870fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 388a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 389c66ac9dbSNicholas Bellinger loff_t start, end; 390c66ac9dbSNicholas Bellinger int ret; 391c66ac9dbSNicholas Bellinger 392c66ac9dbSNicholas Bellinger /* 393c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 394c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 395c66ac9dbSNicholas Bellinger */ 396c66ac9dbSNicholas Bellinger if (immed) 3975787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 398c66ac9dbSNicholas Bellinger 399c66ac9dbSNicholas Bellinger /* 400c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 401c66ac9dbSNicholas Bellinger */ 402a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 403c66ac9dbSNicholas Bellinger start = 0; 404c66ac9dbSNicholas Bellinger end = LLONG_MAX; 405c66ac9dbSNicholas Bellinger } else { 4060fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 407c66ac9dbSNicholas Bellinger if (cmd->data_length) 40862d3ab49SZach Brown end = start + cmd->data_length - 1; 409c66ac9dbSNicholas Bellinger else 410c66ac9dbSNicholas Bellinger end = LLONG_MAX; 411c66ac9dbSNicholas Bellinger } 412c66ac9dbSNicholas Bellinger 413c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 414c66ac9dbSNicholas Bellinger if (ret != 0) 4156708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 416c66ac9dbSNicholas Bellinger 4175787cacdSChristoph Hellwig if (immed) 418ad67f0d9SChristoph Hellwig return 0; 4195787cacdSChristoph Hellwig 420de103c93SChristoph Hellwig if (ret) 4215787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 422de103c93SChristoph Hellwig else 4235787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 424ad67f0d9SChristoph Hellwig 425ad67f0d9SChristoph Hellwig return 0; 426c66ac9dbSNicholas Bellinger } 427c66ac9dbSNicholas Bellinger 4287b745c84SNicholas Bellinger static sense_reason_t 4297b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 4307b745c84SNicholas Bellinger { 4317b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 4327b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 4337b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 434d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 435d4c5dcacSChristoph Hellwig struct iov_iter iter; 436d4c5dcacSChristoph Hellwig struct bio_vec *bvec; 437d4c5dcacSChristoph Hellwig unsigned int len = 0, i; 438d4c5dcacSChristoph Hellwig ssize_t ret; 4397b745c84SNicholas Bellinger 4407b745c84SNicholas Bellinger if (!nolb) { 4417b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4427b745c84SNicholas Bellinger return 0; 4437b745c84SNicholas Bellinger } 444afd73f1bSNicholas Bellinger if (cmd->prot_op) { 445afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO" 446afd73f1bSNicholas Bellinger " backends not supported\n"); 447afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 448afd73f1bSNicholas Bellinger } 4497b745c84SNicholas Bellinger 4507b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 451d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 4527b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 453d4c5dcacSChristoph Hellwig " block_size: %u\n", 454d4c5dcacSChristoph Hellwig cmd->t_data_nents, 455d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length, 4567b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 4577b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4587b745c84SNicholas Bellinger } 4597b745c84SNicholas Bellinger 460d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 461d4c5dcacSChristoph Hellwig if (!bvec) 4627b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4637b745c84SNicholas Bellinger 464d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) { 465d4c5dcacSChristoph Hellwig bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 466d4c5dcacSChristoph Hellwig bvec[i].bv_len = cmd->t_data_sg[0].length; 467d4c5dcacSChristoph Hellwig bvec[i].bv_offset = cmd->t_data_sg[0].offset; 468d4c5dcacSChristoph Hellwig 469d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size; 4707b745c84SNicholas Bellinger } 4717b745c84SNicholas Bellinger 472aa563d7bSDavid Howells iov_iter_bvec(&iter, READ, bvec, nolb, len); 473abbb6589SChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); 4747b745c84SNicholas Bellinger 475d4c5dcacSChristoph Hellwig kfree(bvec); 476d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) { 477d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret); 4787b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4797b745c84SNicholas Bellinger } 4807b745c84SNicholas Bellinger 4817b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4827b745c84SNicholas Bellinger return 0; 4837b745c84SNicholas Bellinger } 4847b745c84SNicholas Bellinger 48564d240b7SAkinobu Mita static int 48664d240b7SAkinobu Mita fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, 48764d240b7SAkinobu Mita void *buf, size_t bufsize) 48864d240b7SAkinobu Mita { 48964d240b7SAkinobu Mita struct fd_dev *fd_dev = FD_DEV(se_dev); 49064d240b7SAkinobu Mita struct file *prot_fd = fd_dev->fd_prot_file; 49164d240b7SAkinobu Mita sector_t prot_length, prot; 49264d240b7SAkinobu Mita loff_t pos = lba * se_dev->prot_length; 49364d240b7SAkinobu Mita 49464d240b7SAkinobu Mita if (!prot_fd) { 49564d240b7SAkinobu Mita pr_err("Unable to locate fd_dev->fd_prot_file\n"); 49664d240b7SAkinobu Mita return -ENODEV; 49764d240b7SAkinobu Mita } 49864d240b7SAkinobu Mita 49964d240b7SAkinobu Mita prot_length = nolb * se_dev->prot_length; 50064d240b7SAkinobu Mita 501*4524a0b1SChaitanya Kulkarni memset(buf, 0xff, bufsize); 50264d240b7SAkinobu Mita for (prot = 0; prot < prot_length;) { 50364d240b7SAkinobu Mita sector_t len = min_t(sector_t, bufsize, prot_length - prot); 504e13ec939SChristoph Hellwig ssize_t ret = kernel_write(prot_fd, buf, len, &pos); 50564d240b7SAkinobu Mita 50664d240b7SAkinobu Mita if (ret != len) { 50764d240b7SAkinobu Mita pr_err("vfs_write to prot file failed: %zd\n", ret); 50864d240b7SAkinobu Mita return ret < 0 ? ret : -ENODEV; 50964d240b7SAkinobu Mita } 51064d240b7SAkinobu Mita prot += ret; 51164d240b7SAkinobu Mita } 51264d240b7SAkinobu Mita 51364d240b7SAkinobu Mita return 0; 51464d240b7SAkinobu Mita } 51564d240b7SAkinobu Mita 51664d240b7SAkinobu Mita static int 51764d240b7SAkinobu Mita fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 51864d240b7SAkinobu Mita { 51964d240b7SAkinobu Mita void *buf; 52064d240b7SAkinobu Mita int rc; 52164d240b7SAkinobu Mita 52264d240b7SAkinobu Mita buf = (void *)__get_free_page(GFP_KERNEL); 52364d240b7SAkinobu Mita if (!buf) { 52464d240b7SAkinobu Mita pr_err("Unable to allocate FILEIO prot buf\n"); 52564d240b7SAkinobu Mita return -ENOMEM; 52664d240b7SAkinobu Mita } 52764d240b7SAkinobu Mita 52864d240b7SAkinobu Mita rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); 52964d240b7SAkinobu Mita 53064d240b7SAkinobu Mita free_page((unsigned long)buf); 53164d240b7SAkinobu Mita 53264d240b7SAkinobu Mita return rc; 53364d240b7SAkinobu Mita } 53464d240b7SAkinobu Mita 535de103c93SChristoph Hellwig static sense_reason_t 53662e46942SChristoph Hellwig fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 53770d3ae5cSAsias He { 53862e46942SChristoph Hellwig struct file *file = FD_DEV(cmd->se_dev)->fd_file; 53970d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 54070d3ae5cSAsias He int ret; 54170d3ae5cSAsias He 542594e25e7SJiang Yi if (!nolb) { 543594e25e7SJiang Yi return 0; 544594e25e7SJiang Yi } 545594e25e7SJiang Yi 54664d240b7SAkinobu Mita if (cmd->se_dev->dev_attrib.pi_prot_type) { 54764d240b7SAkinobu Mita ret = fd_do_prot_unmap(cmd, lba, nolb); 54864d240b7SAkinobu Mita if (ret) 54964d240b7SAkinobu Mita return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 55064d240b7SAkinobu Mita } 55164d240b7SAkinobu Mita 55270d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 55370d3ae5cSAsias He /* The backend is block device, use discard */ 5544e7b5671SChristoph Hellwig struct block_device *bdev = I_BDEV(inode); 5558a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 55670d3ae5cSAsias He 5578a9ebe71SMike Christie ret = blkdev_issue_discard(bdev, 5588a9ebe71SMike Christie target_to_linux_sector(dev, lba), 5598a9ebe71SMike Christie target_to_linux_sector(dev, nolb), 5608a9ebe71SMike Christie GFP_KERNEL, 0); 56170d3ae5cSAsias He if (ret < 0) { 56270d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 56370d3ae5cSAsias He ret); 56470d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 56570d3ae5cSAsias He } 56670d3ae5cSAsias He } else { 56770d3ae5cSAsias He /* The backend is normal file, use fallocate */ 56843f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 56943f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 57070d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 57170d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 57270d3ae5cSAsias He 57370d3ae5cSAsias He if (!file->f_op->fallocate) 57470d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57570d3ae5cSAsias He 57670d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 57770d3ae5cSAsias He if (ret < 0) { 57870d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 57970d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 58070d3ae5cSAsias He } 58170d3ae5cSAsias He } 58270d3ae5cSAsias He 58343f55bbbSAsias He return 0; 58443f55bbbSAsias He } 58543f55bbbSAsias He 58643f55bbbSAsias He static sense_reason_t 587769031c9SAndrei Vagin fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 588a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 589c66ac9dbSNicholas Bellinger { 590c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 5918287fa5fSSagi Grimberg struct fd_dev *fd_dev = FD_DEV(dev); 5928287fa5fSSagi Grimberg struct file *file = fd_dev->fd_file; 5938287fa5fSSagi Grimberg struct file *pfile = fd_dev->fd_prot_file; 59442201b55SNicholas Bellinger sense_reason_t rc; 595c66ac9dbSNicholas Bellinger int ret = 0; 596046ba642SNicholas Bellinger /* 597c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 598c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 599c66ac9dbSNicholas Bellinger */ 6005787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 601ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 6028287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 6038287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 6048287fa5fSSagi Grimberg cmd->prot_length, 0); 60542201b55SNicholas Bellinger if (ret < 0) 60642201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 60742201b55SNicholas Bellinger } 60842201b55SNicholas Bellinger 6098287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 6108287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 0); 61142201b55SNicholas Bellinger 612056e8924SDmitry Monakhov if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && 613056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) { 6148287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 6158287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 61642201b55SNicholas Bellinger 617f75b6faeSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 618f75b6faeSSagi Grimberg 0, cmd->t_prot_sg, 0); 6198287fa5fSSagi Grimberg if (rc) 62042201b55SNicholas Bellinger return rc; 62142201b55SNicholas Bellinger } 622c66ac9dbSNicholas Bellinger } else { 623056e8924SDmitry Monakhov if (cmd->prot_type && dev->dev_attrib.pi_prot_type && 624056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) { 6258287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 6268287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 62742201b55SNicholas Bellinger 6288287fa5fSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 6298287fa5fSSagi Grimberg 0, cmd->t_prot_sg, 0); 6308287fa5fSSagi Grimberg if (rc) 63142201b55SNicholas Bellinger return rc; 63242201b55SNicholas Bellinger } 63342201b55SNicholas Bellinger 6348287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 6358287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 1); 636a4dff304SNicholas Bellinger /* 637125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 638a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 639a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 640a4dff304SNicholas Bellinger */ 641814e5b45SChristoph Hellwig if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { 642a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 6430fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 64462d3ab49SZach Brown loff_t end; 64562d3ab49SZach Brown 64662d3ab49SZach Brown if (cmd->data_length) 64762d3ab49SZach Brown end = start + cmd->data_length - 1; 64862d3ab49SZach Brown else 64962d3ab49SZach Brown end = LLONG_MAX; 650c66ac9dbSNicholas Bellinger 651a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 652a4dff304SNicholas Bellinger } 653c66ac9dbSNicholas Bellinger 654ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 6558287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 6568287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 6578287fa5fSSagi Grimberg cmd->prot_length, 1); 658de103c93SChristoph Hellwig if (ret < 0) 659de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 66042201b55SNicholas Bellinger } 66142201b55SNicholas Bellinger } 66242201b55SNicholas Bellinger 6638287fa5fSSagi Grimberg if (ret < 0) 66442201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 665de103c93SChristoph Hellwig 6665787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 66703e98c9eSNicholas Bellinger return 0; 668c66ac9dbSNicholas Bellinger } 669c66ac9dbSNicholas Bellinger 670769031c9SAndrei Vagin static sense_reason_t 671769031c9SAndrei Vagin fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 672769031c9SAndrei Vagin enum dma_data_direction data_direction) 673769031c9SAndrei Vagin { 674769031c9SAndrei Vagin struct se_device *dev = cmd->se_dev; 675769031c9SAndrei Vagin struct fd_dev *fd_dev = FD_DEV(dev); 676769031c9SAndrei Vagin 677769031c9SAndrei Vagin /* 678769031c9SAndrei Vagin * We are currently limited by the number of iovecs (2048) per 679769031c9SAndrei Vagin * single vfs_[writev,readv] call. 680769031c9SAndrei Vagin */ 681769031c9SAndrei Vagin if (cmd->data_length > FD_MAX_BYTES) { 682769031c9SAndrei Vagin pr_err("FILEIO: Not able to process I/O of %u bytes due to" 683769031c9SAndrei Vagin "FD_MAX_BYTES: %u iovec count limitation\n", 684769031c9SAndrei Vagin cmd->data_length, FD_MAX_BYTES); 685769031c9SAndrei Vagin return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 686769031c9SAndrei Vagin } 687769031c9SAndrei Vagin 688769031c9SAndrei Vagin if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO) 689769031c9SAndrei Vagin return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction); 690769031c9SAndrei Vagin return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction); 691769031c9SAndrei Vagin } 692769031c9SAndrei Vagin 693c66ac9dbSNicholas Bellinger enum { 694769031c9SAndrei Vagin Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, 695769031c9SAndrei Vagin Opt_fd_async_io, Opt_err 696c66ac9dbSNicholas Bellinger }; 697c66ac9dbSNicholas Bellinger 698c66ac9dbSNicholas Bellinger static match_table_t tokens = { 699c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 700c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 701b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 702769031c9SAndrei Vagin {Opt_fd_async_io, "fd_async_io=%d"}, 703c66ac9dbSNicholas Bellinger {Opt_err, NULL} 704c66ac9dbSNicholas Bellinger }; 705c66ac9dbSNicholas Bellinger 7060fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 707c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 708c66ac9dbSNicholas Bellinger { 7090fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 710c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 711c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 712b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 713c66ac9dbSNicholas Bellinger 714c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 715c66ac9dbSNicholas Bellinger if (!opts) 716c66ac9dbSNicholas Bellinger return -ENOMEM; 717c66ac9dbSNicholas Bellinger 718c66ac9dbSNicholas Bellinger orig = opts; 719c66ac9dbSNicholas Bellinger 72090c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 721c66ac9dbSNicholas Bellinger if (!*ptr) 722c66ac9dbSNicholas Bellinger continue; 723c66ac9dbSNicholas Bellinger 724c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 725c66ac9dbSNicholas Bellinger switch (token) { 726c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 727dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 728dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 729dbc6e022SAl Viro ret = -EINVAL; 7306d180253SJesper Juhl break; 7316d180253SJesper Juhl } 7326708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 733c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 734c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 735c66ac9dbSNicholas Bellinger break; 736c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 737c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 7386d180253SJesper Juhl if (!arg_p) { 7396d180253SJesper Juhl ret = -ENOMEM; 7406d180253SJesper Juhl break; 7416d180253SJesper Juhl } 74257103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 7436d180253SJesper Juhl kfree(arg_p); 744c66ac9dbSNicholas Bellinger if (ret < 0) { 74557103d7fSJingoo Han pr_err("kstrtoull() failed for" 746c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 747c66ac9dbSNicholas Bellinger goto out; 748c66ac9dbSNicholas Bellinger } 7496708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 750c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 751c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 752c66ac9dbSNicholas Bellinger break; 753b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 754ce31c1b0SJoern Engel ret = match_int(args, &arg); 755ce31c1b0SJoern Engel if (ret) 756ce31c1b0SJoern Engel goto out; 757b32f4c7eSNicholas Bellinger if (arg != 1) { 758b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 759b32f4c7eSNicholas Bellinger ret = -EINVAL; 760b32f4c7eSNicholas Bellinger goto out; 761b32f4c7eSNicholas Bellinger } 762b32f4c7eSNicholas Bellinger 763b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 764b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 765b32f4c7eSNicholas Bellinger 766b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 767b32f4c7eSNicholas Bellinger break; 768769031c9SAndrei Vagin case Opt_fd_async_io: 769769031c9SAndrei Vagin ret = match_int(args, &arg); 770769031c9SAndrei Vagin if (ret) 771769031c9SAndrei Vagin goto out; 772769031c9SAndrei Vagin if (arg != 1) { 773769031c9SAndrei Vagin pr_err("bogus fd_async_io=%d value\n", arg); 774769031c9SAndrei Vagin ret = -EINVAL; 775769031c9SAndrei Vagin goto out; 776769031c9SAndrei Vagin } 777769031c9SAndrei Vagin 778769031c9SAndrei Vagin pr_debug("FILEIO: Using async I/O" 779769031c9SAndrei Vagin " operations for struct fd_dev\n"); 780769031c9SAndrei Vagin 781769031c9SAndrei Vagin fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO; 782769031c9SAndrei Vagin break; 783c66ac9dbSNicholas Bellinger default: 784c66ac9dbSNicholas Bellinger break; 785c66ac9dbSNicholas Bellinger } 786c66ac9dbSNicholas Bellinger } 787c66ac9dbSNicholas Bellinger 788c66ac9dbSNicholas Bellinger out: 789c66ac9dbSNicholas Bellinger kfree(orig); 790c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 791c66ac9dbSNicholas Bellinger } 792c66ac9dbSNicholas Bellinger 7930fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 794c66ac9dbSNicholas Bellinger { 7950fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 796c66ac9dbSNicholas Bellinger ssize_t bl = 0; 797c66ac9dbSNicholas Bellinger 798c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 799769031c9SAndrei Vagin bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n", 800b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 801b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 802769031c9SAndrei Vagin "Buffered-WCE" : "O_DSYNC", 803769031c9SAndrei Vagin !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); 804c66ac9dbSNicholas Bellinger return bl; 805c66ac9dbSNicholas Bellinger } 806c66ac9dbSNicholas Bellinger 807c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 808c66ac9dbSNicholas Bellinger { 8090fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 810cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 811cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 812cd9323fdSNicholas Bellinger unsigned long long dev_size; 813cd9323fdSNicholas Bellinger /* 814cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 815cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 816cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 817cd9323fdSNicholas Bellinger */ 818cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 81921363ca8SNicholas Bellinger dev_size = i_size_read(i); 820cd9323fdSNicholas Bellinger else 821cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 822c66ac9dbSNicholas Bellinger 82321363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 82421363ca8SNicholas Bellinger dev->dev_attrib.block_size); 825c66ac9dbSNicholas Bellinger } 826c66ac9dbSNicholas Bellinger 8270f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 8280f5e2ec4SNicholas Bellinger { 8290f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8300f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 8310f5e2ec4SNicholas Bellinger struct inode *inode; 8320f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 8330f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 8340f5e2ec4SNicholas Bellinger 8350f5e2ec4SNicholas Bellinger if (!file) { 8360f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 8370f5e2ec4SNicholas Bellinger return -ENODEV; 8380f5e2ec4SNicholas Bellinger } 8390f5e2ec4SNicholas Bellinger 8400f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 8410f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 8420f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 8430f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 8440f5e2ec4SNicholas Bellinger return -ENOSYS; 8450f5e2ec4SNicholas Bellinger } 8460f5e2ec4SNicholas Bellinger 8470f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 8480f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 8490f5e2ec4SNicholas Bellinger 8500f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 8510f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 8520f5e2ec4SNicholas Bellinger 8530f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 8540f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 8550f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 8560f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 8570f5e2ec4SNicholas Bellinger return ret; 8580f5e2ec4SNicholas Bellinger } 8590f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 8600f5e2ec4SNicholas Bellinger 8610f5e2ec4SNicholas Bellinger return 0; 8620f5e2ec4SNicholas Bellinger } 8630f5e2ec4SNicholas Bellinger 8640f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 8650f5e2ec4SNicholas Bellinger { 8660f5e2ec4SNicholas Bellinger unsigned char *buf; 8670f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 86864d240b7SAkinobu Mita int ret; 8690f5e2ec4SNicholas Bellinger 8700f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 8710f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 8720f5e2ec4SNicholas Bellinger return -ENODEV; 8730f5e2ec4SNicholas Bellinger } 8740f5e2ec4SNicholas Bellinger 8750f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 8760f5e2ec4SNicholas Bellinger if (!buf) { 8770f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 8780f5e2ec4SNicholas Bellinger return -ENOMEM; 8790f5e2ec4SNicholas Bellinger } 8800f5e2ec4SNicholas Bellinger 8810f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 88264d240b7SAkinobu Mita (unsigned long long)(dev->transport->get_blocks(dev) + 1) * 88364d240b7SAkinobu Mita dev->prot_length); 8840f5e2ec4SNicholas Bellinger 88564d240b7SAkinobu Mita ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, 88664d240b7SAkinobu Mita buf, unit_size); 8870f5e2ec4SNicholas Bellinger vfree(buf); 8880f5e2ec4SNicholas Bellinger return ret; 8890f5e2ec4SNicholas Bellinger } 8900f5e2ec4SNicholas Bellinger 8910f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 8920f5e2ec4SNicholas Bellinger { 8930f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8940f5e2ec4SNicholas Bellinger 8950f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 8960f5e2ec4SNicholas Bellinger return; 8970f5e2ec4SNicholas Bellinger 8980f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 8990f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 9000f5e2ec4SNicholas Bellinger } 9010f5e2ec4SNicholas Bellinger 9029e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 9030c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 904ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 9057b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 90650642762SAsias He .execute_unmap = fd_execute_unmap, 9070c2ad7d1SChristoph Hellwig }; 9080c2ad7d1SChristoph Hellwig 909de103c93SChristoph Hellwig static sense_reason_t 910de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 9110c2ad7d1SChristoph Hellwig { 9129e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 9130c2ad7d1SChristoph Hellwig } 9140c2ad7d1SChristoph Hellwig 9150a06d430SChristoph Hellwig static const struct target_backend_ops fileio_ops = { 916c66ac9dbSNicholas Bellinger .name = "fileio", 9170fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 9180fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 919c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 920c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 921c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 9220fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 9230fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 92492634706SMike Christie .destroy_device = fd_destroy_device, 925c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 9260c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 927c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 928c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 9296f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 930c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 9310f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 9320f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 9330f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 9345873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 935c66ac9dbSNicholas Bellinger }; 936c66ac9dbSNicholas Bellinger 937c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 938c66ac9dbSNicholas Bellinger { 9390a06d430SChristoph Hellwig return transport_backend_register(&fileio_ops); 940c66ac9dbSNicholas Bellinger } 941c66ac9dbSNicholas Bellinger 94263b91d5aSAsias He static void __exit fileio_module_exit(void) 943c66ac9dbSNicholas Bellinger { 9440a06d430SChristoph Hellwig target_backend_unregister(&fileio_ops); 945c66ac9dbSNicholas Bellinger } 946c66ac9dbSNicholas Bellinger 947c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 948c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 949c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 950c66ac9dbSNicholas Bellinger 951c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 952c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 953