// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * Filename: target_core_file.c * * This file contains the Storage Engine <-> FILEIO transport specific functions * * (c) Copyright 2005-2013 Datera, Inc. * * Nicholas A. Bellinger * ******************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "target_core_file.h" static inline struct fd_dev *FD_DEV(struct se_device *dev) { return container_of(dev, struct fd_dev, dev); } static int fd_attach_hba(struct se_hba *hba, u32 host_id) { struct fd_host *fd_host; fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); if (!fd_host) { pr_err("Unable to allocate memory for struct fd_host\n"); return -ENOMEM; } fd_host->fd_host_id = host_id; hba->hba_ptr = fd_host; pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" " Target Core Stack %s\n", hba->hba_id, FD_VERSION, TARGET_CORE_VERSION); pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", hba->hba_id, fd_host->fd_host_id); return 0; } static void fd_detach_hba(struct se_hba *hba) { struct fd_host *fd_host = hba->hba_ptr; pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" " Target Core\n", hba->hba_id, fd_host->fd_host_id); kfree(fd_host); hba->hba_ptr = NULL; } static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) { struct fd_dev *fd_dev; struct fd_host *fd_host = hba->hba_ptr; fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); if (!fd_dev) { pr_err("Unable to allocate memory for struct fd_dev\n"); return NULL; } fd_dev->fd_host = fd_host; pr_debug("FILEIO: Allocated fd_dev for %p\n", name); return &fd_dev->dev; } static int fd_configure_device(struct se_device *dev) { struct fd_dev *fd_dev = FD_DEV(dev); struct fd_host *fd_host = dev->se_hba->hba_ptr; struct file *file; struct inode *inode = NULL; int flags, ret = -EINVAL; if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { pr_err("Missing fd_dev_name=\n"); return -EINVAL; } /* * Use O_DSYNC by default instead of O_SYNC to forgo syncing * of pure timestamp updates. */ flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; /* * Optionally allow fd_buffered_io=1 to be enabled for people * who want use the fs buffer cache as an WriteCache mechanism. * * This means that in event of a hard failure, there is a risk * of silent data-loss if the SCSI client has *not* performed a * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE * to write-out the entire device cache. */ if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); flags &= ~O_DSYNC; } file = filp_open(fd_dev->fd_dev_name, flags, 0600); if (IS_ERR(file)) { pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); ret = PTR_ERR(file); goto fail; } fd_dev->fd_file = file; /* * If using a block backend with this struct file, we extract * fd_dev->fd_[block,dev]_size from struct block_device. * * Otherwise, we use the passed fd_size= from configfs */ inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { struct request_queue *q = bdev_get_queue(inode->i_bdev); unsigned long long dev_size; fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); /* * Determine the number of bytes from i_size_read() minus * one (1) logical sector from underlying struct block_device */ dev_size = (i_size_read(file->f_mapping->host) - fd_dev->fd_block_size); pr_debug("FILEIO: Using size: %llu bytes from struct" " block_device blocks: %llu logical_block_size: %d\n", dev_size, div_u64(dev_size, fd_dev->fd_block_size), fd_dev->fd_block_size); if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) pr_debug("IFILE: BLOCK Discard support available," " disabled by default\n"); /* * Enable write same emulation for IBLOCK and use 0xFFFF as * the smaller WRITE_SAME(10) only has a two-byte block count. */ dev->dev_attrib.max_write_same_len = 0xFFFF; if (blk_queue_nonrot(q)) dev->dev_attrib.is_nonrot = 1; } else { if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { pr_err("FILEIO: Missing fd_dev_size=" " parameter, and no backing struct" " block_device\n"); goto fail; } fd_dev->fd_block_size = FD_BLOCKSIZE; /* * Limit UNMAP emulation to 8k Number of LBAs (NoLB) */ dev->dev_attrib.max_unmap_lba_count = 0x2000; /* * Currently hardcoded to 1 in Linux/SCSI code.. */ dev->dev_attrib.max_unmap_block_desc_count = 1; dev->dev_attrib.unmap_granularity = 1; dev->dev_attrib.unmap_granularity_alignment = 0; /* * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) * based upon struct iovec limit for vfs_writev() */ dev->dev_attrib.max_write_same_len = 0x1000; } dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" " with FDBD_HAS_BUFFERED_IO_WCE\n"); dev->dev_attrib.emulate_write_cache = 1; } fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; fd_dev->fd_queue_depth = dev->queue_depth; pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, fd_dev->fd_dev_name, fd_dev->fd_dev_size); return 0; fail: if (fd_dev->fd_file) { filp_close(fd_dev->fd_file, NULL); fd_dev->fd_file = NULL; } return ret; } static void fd_dev_call_rcu(struct rcu_head *p) { struct se_device *dev = container_of(p, struct se_device, rcu_head); struct fd_dev *fd_dev = FD_DEV(dev); kfree(fd_dev); } static void fd_free_device(struct se_device *dev) { call_rcu(&dev->rcu_head, fd_dev_call_rcu); } static void fd_destroy_device(struct se_device *dev) { struct fd_dev *fd_dev = FD_DEV(dev); if (fd_dev->fd_file) { filp_close(fd_dev->fd_file, NULL); fd_dev->fd_file = NULL; } } struct target_core_file_cmd { unsigned long len; struct se_cmd *cmd; struct kiocb iocb; }; static void cmd_rw_aio_complete(struct kiocb *iocb, long ret, long ret2) { struct target_core_file_cmd *cmd; cmd = container_of(iocb, struct target_core_file_cmd, iocb); if (ret != cmd->len) target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION); else target_complete_cmd(cmd->cmd, SAM_STAT_GOOD); kfree(cmd); } static sense_reason_t fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, enum dma_data_direction data_direction) { int is_write = !(data_direction == DMA_FROM_DEVICE); struct se_device *dev = cmd->se_dev; struct fd_dev *fd_dev = FD_DEV(dev); struct file *file = fd_dev->fd_file; struct target_core_file_cmd *aio_cmd; struct iov_iter iter = {}; struct scatterlist *sg; struct bio_vec *bvec; ssize_t len = 0; int ret = 0, i; aio_cmd = kmalloc(sizeof(struct target_core_file_cmd), GFP_KERNEL); if (!aio_cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); if (!bvec) { kfree(aio_cmd); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } for_each_sg(sgl, sg, sgl_nents, i) { bvec[i].bv_page = sg_page(sg); bvec[i].bv_len = sg->length; bvec[i].bv_offset = sg->offset; len += sg->length; } iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len); aio_cmd->cmd = cmd; aio_cmd->len = len; aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size; aio_cmd->iocb.ki_filp = file; aio_cmd->iocb.ki_complete = cmd_rw_aio_complete; aio_cmd->iocb.ki_flags = IOCB_DIRECT; if (is_write && (cmd->se_cmd_flags & SCF_FUA)) aio_cmd->iocb.ki_flags |= IOCB_DSYNC; if (is_write) ret = call_write_iter(file, &aio_cmd->iocb, &iter); else ret = call_read_iter(file, &aio_cmd->iocb, &iter); kfree(bvec); if (ret != -EIOCBQUEUED) cmd_rw_aio_complete(&aio_cmd->iocb, ret, 0); return 0; } static int fd_do_rw(struct se_cmd *cmd, struct file *fd, u32 block_size, struct scatterlist *sgl, u32 sgl_nents, u32 data_length, int is_write) { struct scatterlist *sg; struct iov_iter iter; struct bio_vec *bvec; ssize_t len = 0; loff_t pos = (cmd->t_task_lba * block_size); int ret = 0, i; bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); if (!bvec) { pr_err("Unable to allocate fd_do_readv iov[]\n"); return -ENOMEM; } for_each_sg(sgl, sg, sgl_nents, i) { bvec[i].bv_page = sg_page(sg); bvec[i].bv_len = sg->length; bvec[i].bv_offset = sg->offset; len += sg->length; } iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len); if (is_write) ret = vfs_iter_write(fd, &iter, &pos, 0); else ret = vfs_iter_read(fd, &iter, &pos, 0); if (is_write) { if (ret < 0 || ret != data_length) { pr_err("%s() write returned %d\n", __func__, ret); if (ret >= 0) ret = -EINVAL; } } else { /* * Return zeros and GOOD status even if the READ did not return * the expected virt_size for struct file w/o a backing struct * block_device. */ if (S_ISBLK(file_inode(fd)->i_mode)) { if (ret < 0 || ret != data_length) { pr_err("%s() returned %d, expecting %u for " "S_ISBLK\n", __func__, ret, data_length); if (ret >= 0) ret = -EINVAL; } } else { if (ret < 0) { pr_err("%s() returned %d for non S_ISBLK\n", __func__, ret); } else if (ret != data_length) { /* * Short read case: * Probably some one truncate file under us. * We must explicitly zero sg-pages to prevent * expose uninizialized pages to userspace. */ if (ret < data_length) ret += iov_iter_zero(data_length - ret, &iter); else ret = -EINVAL; } } } kfree(bvec); return ret; } static sense_reason_t fd_execute_sync_cache(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct fd_dev *fd_dev = FD_DEV(dev); int immed = (cmd->t_task_cdb[1] & 0x2); loff_t start, end; int ret; /* * If the Immediate bit is set, queue up the GOOD response * for this SYNCHRONIZE_CACHE op */ if (immed) target_complete_cmd(cmd, SAM_STAT_GOOD); /* * Determine if we will be flushing the entire device. */ if (cmd->t_task_lba == 0 && cmd->data_length == 0) { start = 0; end = LLONG_MAX; } else { start = cmd->t_task_lba * dev->dev_attrib.block_size; if (cmd->data_length) end = start + cmd->data_length - 1; else end = LLONG_MAX; } ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); if (ret != 0) pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); if (immed) return 0; if (ret) target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); else target_complete_cmd(cmd, SAM_STAT_GOOD); return 0; } static sense_reason_t fd_execute_write_same(struct se_cmd *cmd) { struct se_device *se_dev = cmd->se_dev; struct fd_dev *fd_dev = FD_DEV(se_dev); loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; sector_t nolb = sbc_get_write_same_sectors(cmd); struct iov_iter iter; struct bio_vec *bvec; unsigned int len = 0, i; ssize_t ret; if (!nolb) { target_complete_cmd(cmd, SAM_STAT_GOOD); return 0; } if (cmd->prot_op) { pr_err("WRITE_SAME: Protection information with FILEIO" " backends not supported\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } if (cmd->t_data_nents > 1 || cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" " block_size: %u\n", cmd->t_data_nents, cmd->t_data_sg[0].length, cmd->se_dev->dev_attrib.block_size); return TCM_INVALID_CDB_FIELD; } bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); if (!bvec) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for (i = 0; i < nolb; i++) { bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); bvec[i].bv_len = cmd->t_data_sg[0].length; bvec[i].bv_offset = cmd->t_data_sg[0].offset; len += se_dev->dev_attrib.block_size; } iov_iter_bvec(&iter, WRITE, bvec, nolb, len); ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); kfree(bvec); if (ret < 0 || ret != len) { pr_err("vfs_iter_write() returned %zd for write same\n", ret); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } target_complete_cmd(cmd, SAM_STAT_GOOD); return 0; } static int fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, void *buf, size_t bufsize) { struct fd_dev *fd_dev = FD_DEV(se_dev); struct file *prot_fd = fd_dev->fd_prot_file; sector_t prot_length, prot; loff_t pos = lba * se_dev->prot_length; if (!prot_fd) { pr_err("Unable to locate fd_dev->fd_prot_file\n"); return -ENODEV; } prot_length = nolb * se_dev->prot_length; for (prot = 0; prot < prot_length;) { sector_t len = min_t(sector_t, bufsize, prot_length - prot); ssize_t ret = kernel_write(prot_fd, buf, len, &pos); if (ret != len) { pr_err("vfs_write to prot file failed: %zd\n", ret); return ret < 0 ? ret : -ENODEV; } prot += ret; } return 0; } static int fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) { void *buf; int rc; buf = (void *)__get_free_page(GFP_KERNEL); if (!buf) { pr_err("Unable to allocate FILEIO prot buf\n"); return -ENOMEM; } memset(buf, 0xff, PAGE_SIZE); rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); free_page((unsigned long)buf); return rc; } static sense_reason_t fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) { struct file *file = FD_DEV(cmd->se_dev)->fd_file; struct inode *inode = file->f_mapping->host; int ret; if (!nolb) { return 0; } if (cmd->se_dev->dev_attrib.pi_prot_type) { ret = fd_do_prot_unmap(cmd, lba, nolb); if (ret) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } if (S_ISBLK(inode->i_mode)) { /* The backend is block device, use discard */ struct block_device *bdev = inode->i_bdev; struct se_device *dev = cmd->se_dev; ret = blkdev_issue_discard(bdev, target_to_linux_sector(dev, lba), target_to_linux_sector(dev, nolb), GFP_KERNEL, 0); if (ret < 0) { pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", ret); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } } else { /* The backend is normal file, use fallocate */ struct se_device *se_dev = cmd->se_dev; loff_t pos = lba * se_dev->dev_attrib.block_size; unsigned int len = nolb * se_dev->dev_attrib.block_size; int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; if (!file->f_op->fallocate) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; ret = file->f_op->fallocate(file, mode, pos, len); if (ret < 0) { pr_warn("FILEIO: fallocate() failed: %d\n", ret); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } } return 0; } static sense_reason_t fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, enum dma_data_direction data_direction) { struct se_device *dev = cmd->se_dev; struct fd_dev *fd_dev = FD_DEV(dev); struct file *file = fd_dev->fd_file; struct file *pfile = fd_dev->fd_prot_file; sense_reason_t rc; int ret = 0; /* * Call vectorized fileio functions to map struct scatterlist * physical memory addresses to struct iovec virtual memory. */ if (data_direction == DMA_FROM_DEVICE) { if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { ret = fd_do_rw(cmd, pfile, dev->prot_length, cmd->t_prot_sg, cmd->t_prot_nents, cmd->prot_length, 0); if (ret < 0) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, sgl, sgl_nents, cmd->data_length, 0); if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && dev->dev_attrib.pi_prot_verify) { u32 sectors = cmd->data_length >> ilog2(dev->dev_attrib.block_size); rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, cmd->t_prot_sg, 0); if (rc) return rc; } } else { if (cmd->prot_type && dev->dev_attrib.pi_prot_type && dev->dev_attrib.pi_prot_verify) { u32 sectors = cmd->data_length >> ilog2(dev->dev_attrib.block_size); rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, cmd->t_prot_sg, 0); if (rc) return rc; } ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, sgl, sgl_nents, cmd->data_length, 1); /* * Perform implicit vfs_fsync_range() for fd_do_writev() ops * for SCSI WRITEs with Forced Unit Access (FUA) set. * Allow this to happen independent of WCE=0 setting. */ if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { loff_t start = cmd->t_task_lba * dev->dev_attrib.block_size; loff_t end; if (cmd->data_length) end = start + cmd->data_length - 1; else end = LLONG_MAX; vfs_fsync_range(fd_dev->fd_file, start, end, 1); } if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { ret = fd_do_rw(cmd, pfile, dev->prot_length, cmd->t_prot_sg, cmd->t_prot_nents, cmd->prot_length, 1); if (ret < 0) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } } if (ret < 0) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; target_complete_cmd(cmd, SAM_STAT_GOOD); return 0; } static sense_reason_t fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, enum dma_data_direction data_direction) { struct se_device *dev = cmd->se_dev; struct fd_dev *fd_dev = FD_DEV(dev); /* * We are currently limited by the number of iovecs (2048) per * single vfs_[writev,readv] call. */ if (cmd->data_length > FD_MAX_BYTES) { pr_err("FILEIO: Not able to process I/O of %u bytes due to" "FD_MAX_BYTES: %u iovec count limitation\n", cmd->data_length, FD_MAX_BYTES); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO) return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction); return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction); } enum { Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_fd_async_io, Opt_err }; static match_table_t tokens = { {Opt_fd_dev_name, "fd_dev_name=%s"}, {Opt_fd_dev_size, "fd_dev_size=%s"}, {Opt_fd_buffered_io, "fd_buffered_io=%d"}, {Opt_fd_async_io, "fd_async_io=%d"}, {Opt_err, NULL} }; static ssize_t fd_set_configfs_dev_params(struct se_device *dev, const char *page, ssize_t count) { struct fd_dev *fd_dev = FD_DEV(dev); char *orig, *ptr, *arg_p, *opts; substring_t args[MAX_OPT_ARGS]; int ret = 0, arg, token; opts = kstrdup(page, GFP_KERNEL); if (!opts) return -ENOMEM; orig = opts; while ((ptr = strsep(&opts, ",\n")) != NULL) { if (!*ptr) continue; token = match_token(ptr, tokens, args); switch (token) { case Opt_fd_dev_name: if (match_strlcpy(fd_dev->fd_dev_name, &args[0], FD_MAX_DEV_NAME) == 0) { ret = -EINVAL; break; } pr_debug("FILEIO: Referencing Path: %s\n", fd_dev->fd_dev_name); fd_dev->fbd_flags |= FBDF_HAS_PATH; break; case Opt_fd_dev_size: arg_p = match_strdup(&args[0]); if (!arg_p) { ret = -ENOMEM; break; } ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); kfree(arg_p); if (ret < 0) { pr_err("kstrtoull() failed for" " fd_dev_size=\n"); goto out; } pr_debug("FILEIO: Referencing Size: %llu" " bytes\n", fd_dev->fd_dev_size); fd_dev->fbd_flags |= FBDF_HAS_SIZE; break; case Opt_fd_buffered_io: ret = match_int(args, &arg); if (ret) goto out; if (arg != 1) { pr_err("bogus fd_buffered_io=%d value\n", arg); ret = -EINVAL; goto out; } pr_debug("FILEIO: Using buffered I/O" " operations for struct fd_dev\n"); fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; break; case Opt_fd_async_io: ret = match_int(args, &arg); if (ret) goto out; if (arg != 1) { pr_err("bogus fd_async_io=%d value\n", arg); ret = -EINVAL; goto out; } pr_debug("FILEIO: Using async I/O" " operations for struct fd_dev\n"); fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO; break; default: break; } } out: kfree(orig); return (!ret) ? count : ret; } static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) { struct fd_dev *fd_dev = FD_DEV(dev); ssize_t bl = 0; bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n", fd_dev->fd_dev_name, fd_dev->fd_dev_size, (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? "Buffered-WCE" : "O_DSYNC", !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); return bl; } static sector_t fd_get_blocks(struct se_device *dev) { struct fd_dev *fd_dev = FD_DEV(dev); struct file *f = fd_dev->fd_file; struct inode *i = f->f_mapping->host; unsigned long long dev_size; /* * When using a file that references an underlying struct block_device, * ensure dev_size is always based on the current inode size in order * to handle underlying block_device resize operations. */ if (S_ISBLK(i->i_mode)) dev_size = i_size_read(i); else dev_size = fd_dev->fd_dev_size; return div_u64(dev_size - dev->dev_attrib.block_size, dev->dev_attrib.block_size); } static int fd_init_prot(struct se_device *dev) { struct fd_dev *fd_dev = FD_DEV(dev); struct file *prot_file, *file = fd_dev->fd_file; struct inode *inode; int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; char buf[FD_MAX_DEV_PROT_NAME]; if (!file) { pr_err("Unable to locate fd_dev->fd_file\n"); return -ENODEV; } inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { pr_err("FILEIO Protection emulation only supported on" " !S_ISBLK\n"); return -ENOSYS; } if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) flags &= ~O_DSYNC; snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", fd_dev->fd_dev_name); prot_file = filp_open(buf, flags, 0600); if (IS_ERR(prot_file)) { pr_err("filp_open(%s) failed\n", buf); ret = PTR_ERR(prot_file); return ret; } fd_dev->fd_prot_file = prot_file; return 0; } static int fd_format_prot(struct se_device *dev) { unsigned char *buf; int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; int ret; if (!dev->dev_attrib.pi_prot_type) { pr_err("Unable to format_prot while pi_prot_type == 0\n"); return -ENODEV; } buf = vzalloc(unit_size); if (!buf) { pr_err("Unable to allocate FILEIO prot buf\n"); return -ENOMEM; } pr_debug("Using FILEIO prot_length: %llu\n", (unsigned long long)(dev->transport->get_blocks(dev) + 1) * dev->prot_length); memset(buf, 0xff, unit_size); ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, buf, unit_size); vfree(buf); return ret; } static void fd_free_prot(struct se_device *dev) { struct fd_dev *fd_dev = FD_DEV(dev); if (!fd_dev->fd_prot_file) return; filp_close(fd_dev->fd_prot_file, NULL); fd_dev->fd_prot_file = NULL; } static struct sbc_ops fd_sbc_ops = { .execute_rw = fd_execute_rw, .execute_sync_cache = fd_execute_sync_cache, .execute_write_same = fd_execute_write_same, .execute_unmap = fd_execute_unmap, }; static sense_reason_t fd_parse_cdb(struct se_cmd *cmd) { return sbc_parse_cdb(cmd, &fd_sbc_ops); } static const struct target_backend_ops fileio_ops = { .name = "fileio", .inquiry_prod = "FILEIO", .inquiry_rev = FD_VERSION, .owner = THIS_MODULE, .attach_hba = fd_attach_hba, .detach_hba = fd_detach_hba, .alloc_device = fd_alloc_device, .configure_device = fd_configure_device, .destroy_device = fd_destroy_device, .free_device = fd_free_device, .parse_cdb = fd_parse_cdb, .set_configfs_dev_params = fd_set_configfs_dev_params, .show_configfs_dev_params = fd_show_configfs_dev_params, .get_device_type = sbc_get_device_type, .get_blocks = fd_get_blocks, .init_prot = fd_init_prot, .format_prot = fd_format_prot, .free_prot = fd_free_prot, .tb_dev_attrib_attrs = sbc_attrib_attrs, }; static int __init fileio_module_init(void) { return transport_backend_register(&fileio_ops); } static void __exit fileio_module_exit(void) { target_backend_unregister(&fileio_ops); } MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); MODULE_AUTHOR("nab@Linux-iSCSI.org"); MODULE_LICENSE("GPL"); MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver); module_init(fileio_module_init); module_exit(fileio_module_exit);