// 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 <nab@kernel.org> * ******************************************************************************/ #include <linux/string.h>#include <linux/parser.h>#include <linux/timer.h>#include <linux/blkdev.h>#include <linux/slab.h>#include <linux/spinlock.h>#include <linux/module.h>#include <linux/vmalloc.h>#include <linux/falloc.h>#include <linux/uio.h>#include <linux/scatterlist.h>#include <scsi/scsi_proto.h>#include <linux/unaligned.h> #include <target/target_core_base.h>#include <target/target_core_backend.h> #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_obj(struct fd_host); 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_obj(struct fd_dev); 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 bool fd_configure_unmap(struct se_device *dev){ struct file *file = FD_DEV(dev)->fd_file; struct inode *inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) return target_configure_unmap_from_bdev(&dev->dev_attrib, I_BDEV(inode)); /* 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; return true;} 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 block_device *bdev = I_BDEV(inode); unsigned long long dev_size; fd_dev->fd_block_size = bdev_logical_block_size(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); /* * 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 (!bdev_rot(bdev)) 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 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.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; struct bio_vec bvecs[];}; static void cmd_rw_aio_complete(struct kiocb *iocb, long ret){ 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_tfd_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; ssize_t len = 0; int ret = 0, i; aio_cmd = kzalloc_flex(*aio_cmd, bvecs, sgl_nents); if (!aio_cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for_each_sg(sgl, sg, sgl_nents, i) { bvec_set_page(&aio_cmd->bvecs[i], sg_page(sg), sg->length, sg->offset); len += sg->length; } iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, 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 = file->f_op->write_iter(&aio_cmd->iocb, &iter); else ret = file->f_op->read_iter(&aio_cmd->iocb, &iter); if (ret != -EIOCBQUEUED) cmd_rw_aio_complete(&aio_cmd->iocb, ret); 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 = kzalloc_objs(struct bio_vec, sgl_nents); if (!bvec) { pr_err("Unable to allocate fd_do_readv iov[]\n"); return -ENOMEM; } for_each_sg(sgl, sg, sgl_nents, i) { bvec_set_page(&bvec[i], sg_page(sg), sg->length, 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_tfd_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_tfd_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 (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) return TCM_INVALID_CDB_FIELD; 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 = kzalloc_objs(struct bio_vec, nolb); if (!bvec) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for (i = 0; i < nolb; i++) { bvec_set_page(&bvec[i], sg_page(&cmd->t_data_sg[0]), cmd->t_data_sg[0].length, cmd->t_data_sg[0].offset); len += se_dev->dev_attrib.block_size; } iov_iter_bvec(&iter, ITER_SOURCE, 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 intfd_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; memset(buf, 0xff, bufsize); for (prot = 0; prot < prot_length;) { sector_t len = min_t(sector_t, bufsize, prot_length - prot);Lines 1–500 of 950. 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// 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 <nab@kernel.org> * ******************************************************************************/ #include <linux/string.h> #include <linux/parser.h> #include <linux/timer.h> #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/module.h> #include <linux/vmalloc.h> #include <linux/falloc.h> #include <linux/uio.h> #include <linux/scatterlist.h> #include <scsi/scsi_proto.h> #include <linux/unaligned.h> #include <target/target_core_base.h> #include <target/target_core_backend.h> #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_obj(struct fd_host); 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_obj(struct fd_dev); 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 bool fd_configure_unmap(struct se_device *dev) { struct file *file = FD_DEV(dev)->fd_file; struct inode *inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) return target_configure_unmap_from_bdev(&dev->dev_attrib, I_BDEV(inode)); /* 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; return true; } 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 block_device *bdev = I_BDEV(inode); unsigned long long dev_size; fd_dev->fd_block_size = bdev_logical_block_size(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); /* * 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 (!bdev_rot(bdev)) 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 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.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; struct bio_vec bvecs[]; }; static void cmd_rw_aio_complete(struct kiocb *iocb, long ret) { 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; ssize_t len = 0; int ret = 0, i; aio_cmd = kzalloc_flex(*aio_cmd, bvecs, sgl_nents); if (!aio_cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for_each_sg(sgl, sg, sgl_nents, i) { bvec_set_page(&aio_cmd->bvecs[i], sg_page(sg), sg->length, sg->offset); len += sg->length; } iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, 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 = file->f_op->write_iter(&aio_cmd->iocb, &iter); else ret = file->f_op->read_iter(&aio_cmd->iocb, &iter); if (ret != -EIOCBQUEUED) cmd_rw_aio_complete(&aio_cmd->iocb, ret); 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 = kzalloc_objs(struct bio_vec, sgl_nents); if (!bvec) { pr_err("Unable to allocate fd_do_readv iov[]\n"); return -ENOMEM; } for_each_sg(sgl, sg, sgl_nents, i) { bvec_set_page(&bvec[i], sg_page(sg), sg->length, 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 (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) return TCM_INVALID_CDB_FIELD; 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 = kzalloc_objs(struct bio_vec, nolb); if (!bvec) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for (i = 0; i < nolb; i++) { bvec_set_page(&bvec[i], sg_page(&cmd->t_data_sg[0]), cmd->t_data_sg[0].length, cmd->t_data_sg[0].offset); len += se_dev->dev_attrib.block_size; } iov_iter_bvec(&iter, ITER_SOURCE, 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; memset(buf, 0xff, bufsize); for (prot = 0; prot < prot_length;) { sector_t len = min_t(sector_t, bufsize, prot_length - prot);