diff options
Diffstat (limited to 'drivers/target/target_core_file.c')
| -rw-r--r-- | drivers/target/target_core_file.c | 670 |
1 files changed, 434 insertions, 236 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index b11890d85120..b2610073e8cc 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -1,26 +1,13 @@ +// 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 2005-2012 RisingTide Systems LLC. + * (c) Copyright 2005-2013 Datera, Inc. * * Nicholas A. Bellinger <nab@kernel.org> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * ******************************************************************************/ #include <linux/string.h> @@ -30,10 +17,12 @@ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/module.h> +#include <linux/vmalloc.h> #include <linux/falloc.h> -#include <scsi/scsi.h> -#include <scsi/scsi_host.h> -#include <asm/unaligned.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> @@ -45,10 +34,6 @@ static inline struct fd_dev *FD_DEV(struct se_device *dev) return container_of(dev, struct fd_dev, dev); } -/* fd_attach_hba(): (Part of se_subsystem_api_t template) - * - * - */ static int fd_attach_hba(struct se_hba *hba, u32 host_id) { struct fd_host *fd_host; @@ -65,10 +50,9 @@ static int fd_attach_hba(struct se_hba *hba, u32 host_id) pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" " Target Core Stack %s\n", hba->hba_id, FD_VERSION, - TARGET_CORE_MOD_VERSION); - pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" - " MaxSectors: %u\n", - hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); + 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; } @@ -102,6 +86,24 @@ static struct se_device *fd_alloc_device(struct se_hba *hba, const char *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); @@ -150,10 +152,10 @@ static int fd_configure_device(struct se_device *dev) */ inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { - struct request_queue *q = bdev_get_queue(inode->i_bdev); + struct block_device *bdev = I_BDEV(inode); unsigned long long dev_size; - fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); + 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 @@ -166,31 +168,12 @@ static int fd_configure_device(struct se_device *dev) dev_size, div_u64(dev_size, fd_dev->fd_block_size), fd_dev->fd_block_size); /* - * Check if the underlying struct block_device request_queue supports - * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM - * in ATA and we need to set TPE=1 - */ - if (blk_queue_discard(q)) { - dev->dev_attrib.max_unmap_lba_count = - q->limits.max_discard_sectors; - /* - * Currently hardcoded to 1 in Linux/SCSI code.. - */ - dev->dev_attrib.max_unmap_block_desc_count = 1; - dev->dev_attrib.unmap_granularity = - q->limits.discard_granularity >> 9; - dev->dev_attrib.unmap_granularity_alignment = - q->limits.discard_alignment; - 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)) + if (bdev_nonrot(bdev)) dev->dev_attrib.is_nonrot = 1; } else { if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { @@ -201,16 +184,6 @@ static int fd_configure_device(struct se_device *dev) } 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) @@ -220,7 +193,7 @@ static int fd_configure_device(struct se_device *dev) } dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; - dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; + 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) { @@ -245,60 +218,130 @@ fail: 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; } +} - kfree(fd_dev); +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 int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, - u32 sgl_nents, int is_write) +static sense_reason_t +fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, + enum dma_data_direction data_direction) { - struct se_device *se_dev = cmd->se_dev; - struct fd_dev *dev = FD_DEV(se_dev); - struct file *fd = dev->fd_file; + 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 iovec *iov; - mm_segment_t old_fs; - loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); + ssize_t len = 0; int ret = 0, i; - iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); - if (!iov) { - pr_err("Unable to allocate fd_do_readv iov[]\n"); - return -ENOMEM; - } + aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL); + if (!aio_cmd) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; for_each_sg(sgl, sg, sgl_nents, i) { - iov[i].iov_len = sg->length; - iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; + bvec_set_page(&aio_cmd->bvecs[i], sg_page(sg), sg->length, + sg->offset); + len += sg->length; } - old_fs = get_fs(); - set_fs(get_ds()); + 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 = vfs_writev(fd, &iov[0], sgl_nents, &pos); + ret = file->f_op->write_iter(&aio_cmd->iocb, &iter); else - ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); + ret = file->f_op->read_iter(&aio_cmd->iocb, &iter); + + if (ret != -EIOCBQUEUED) + cmd_rw_aio_complete(&aio_cmd->iocb, ret); + + return 0; +} - set_fs(old_fs); +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) - kunmap(sg_page(sg)); + for_each_sg(sgl, sg, sgl_nents, i) { + bvec_set_page(&bvec[i], sg_page(sg), sg->length, sg->offset); + len += sg->length; + } - kfree(iov); + 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 != cmd->data_length) { + if (ret < 0 || ret != data_length) { pr_err("%s() write returned %d\n", __func__, ret); - return (ret < 0 ? ret : -EINVAL); + if (ret >= 0) + ret = -EINVAL; } } else { /* @@ -307,21 +350,33 @@ static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, * block_device. */ if (S_ISBLK(file_inode(fd)->i_mode)) { - if (ret < 0 || ret != cmd->data_length) { + if (ret < 0 || ret != data_length) { pr_err("%s() returned %d, expecting %u for " "S_ISBLK\n", __func__, ret, - cmd->data_length); - return (ret < 0 ? ret : -EINVAL); + data_length); + if (ret >= 0) + ret = -EINVAL; } } else { if (ret < 0) { pr_err("%s() returned %d for non S_ISBLK\n", __func__, ret); - return 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; } } } - return 1; + kfree(bvec); + return ret; } static sense_reason_t @@ -349,7 +404,7 @@ fd_execute_sync_cache(struct se_cmd *cmd) } else { start = cmd->t_task_lba * dev->dev_attrib.block_size; if (cmd->data_length) - end = start + cmd->data_length; + end = start + cmd->data_length - 1; else end = LLONG_MAX; } @@ -369,127 +424,137 @@ fd_execute_sync_cache(struct se_cmd *cmd) return 0; } -static unsigned char * -fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, - unsigned int len) -{ - struct se_device *se_dev = cmd->se_dev; - unsigned int block_size = se_dev->dev_attrib.block_size; - unsigned int i = 0, end; - unsigned char *buf, *p, *kmap_buf; - - buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); - if (!buf) { - pr_err("Unable to allocate fd_execute_write_same buf\n"); - return NULL; - } - - kmap_buf = kmap(sg_page(sg)) + sg->offset; - if (!kmap_buf) { - pr_err("kmap() failed in fd_setup_write_same\n"); - kfree(buf); - return NULL; - } - /* - * Fill local *buf to contain multiple WRITE_SAME blocks up to - * min(len, PAGE_SIZE) - */ - p = buf; - end = min_t(unsigned int, len, PAGE_SIZE); - - while (i < end) { - memcpy(p, kmap_buf, block_size); - - i += block_size; - p += block_size; - } - kunmap(sg_page(sg)); - - return buf; -} - 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); - struct file *f = fd_dev->fd_file; - struct scatterlist *sg; - struct iovec *iov; - mm_segment_t old_fs; - sector_t nolb = sbc_get_write_same_sectors(cmd); loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; - unsigned int len, len_tmp, iov_num; - int i, rc; - unsigned char *buf; - - if (!nolb) { - target_complete_cmd(cmd, SAM_STAT_GOOD); - return 0; + 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; } - sg = &cmd->t_data_sg[0]; + + if (!cmd->t_data_nents) + return TCM_INVALID_CDB_FIELD; if (cmd->t_data_nents > 1 || - sg->length != cmd->se_dev->dev_attrib.block_size) { + 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, sg->length, + " 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; } - len = len_tmp = nolb * se_dev->dev_attrib.block_size; - iov_num = DIV_ROUND_UP(len, PAGE_SIZE); - - buf = fd_setup_write_same_buf(cmd, sg, len); - if (!buf) + bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); + if (!bvec) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - iov = vzalloc(sizeof(struct iovec) * iov_num); - if (!iov) { - pr_err("Unable to allocate fd_execute_write_same iovecs\n"); - kfree(buf); + 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; } - /* - * Map the single fabric received scatterlist block now populated - * in *buf into each iovec for I/O submission. - */ - for (i = 0; i < iov_num; i++) { - iov[i].iov_base = buf; - iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); - len_tmp -= iov[i].iov_len; + + 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; } - old_fs = get_fs(); - set_fs(get_ds()); - rc = vfs_writev(f, &iov[0], iov_num, &pos); - set_fs(old_fs); + prot_length = nolb * se_dev->prot_length; - vfree(iov); - kfree(buf); + memset(buf, 0xff, bufsize); + 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 (rc < 0 || rc != len) { - pr_err("vfs_writev() returned %d for write same\n", rc); - return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + if (ret != len) { + pr_err("vfs_write to prot file failed: %zd\n", ret); + return ret < 0 ? ret : -ENODEV; + } + prot += ret; } - target_complete_cmd(cmd, SAM_STAT_GOOD); 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; + } + + 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_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) +fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) { - struct file *file = priv; + 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 block_device *bdev = I_BDEV(inode); + struct se_device *dev = cmd->se_dev; - ret = blkdev_issue_discard(bdev, lba, - nolb, GFP_KERNEL, 0); + ret = blkdev_issue_discard(bdev, + target_to_linux_sector(dev, lba), + target_to_linux_sector(dev, nolb), + GFP_KERNEL); if (ret < 0) { pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", ret); @@ -516,86 +581,122 @@ fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) } static sense_reason_t -fd_execute_write_same_unmap(struct se_cmd *cmd) +fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, + enum dma_data_direction data_direction) { - struct se_device *se_dev = cmd->se_dev; - struct fd_dev *fd_dev = FD_DEV(se_dev); - struct file *file = fd_dev->fd_file; - sector_t lba = cmd->t_task_lba; - sector_t nolb = sbc_get_write_same_sectors(cmd); - int ret; - - if (!nolb) { - target_complete_cmd(cmd, SAM_STAT_GOOD); - return 0; - } - - ret = fd_do_unmap(cmd, file, lba, nolb); - if (ret) - return ret; - - target_complete_cmd(cmd, GOOD); - return 0; -} - -static sense_reason_t -fd_execute_unmap(struct se_cmd *cmd) -{ - struct file *file = FD_DEV(cmd->se_dev)->fd_file; - - return sbc_execute_unmap(cmd, fd_do_unmap, file); -} - -static sense_reason_t -fd_execute_rw(struct se_cmd *cmd) -{ - struct scatterlist *sgl = cmd->t_data_sg; - u32 sgl_nents = cmd->t_data_nents; - enum dma_data_direction data_direction = cmd->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) { - ret = fd_do_rw(cmd, sgl, sgl_nents, 0); + 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 { - ret = fd_do_rw(cmd, sgl, sgl_nents, 1); + 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 implict vfs_fsync_range() for fd_do_writev() ops + * 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 && - dev->dev_attrib.emulate_fua_write > 0 && - (cmd->se_cmd_flags & SCF_FUA)) { - struct fd_dev *fd_dev = FD_DEV(dev); + if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { loff_t start = cmd->t_task_lba * dev->dev_attrib.block_size; - loff_t end = start + cmd->data_length; + 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; - if (ret) - target_complete_cmd(cmd, SAM_STAT_GOOD); + 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_err + 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} }; @@ -635,10 +736,10 @@ static ssize_t fd_set_configfs_dev_params(struct se_device *dev, ret = -ENOMEM; break; } - ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); + ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); kfree(arg_p); if (ret < 0) { - pr_err("strict_strtoull() failed for" + pr_err("kstrtoull() failed for" " fd_dev_size=\n"); goto out; } @@ -647,7 +748,9 @@ static ssize_t fd_set_configfs_dev_params(struct se_device *dev, fd_dev->fbd_flags |= FBDF_HAS_SIZE; break; case Opt_fd_buffered_io: - match_int(args, &arg); + ret = match_int(args, &arg); + if (ret) + goto out; if (arg != 1) { pr_err("bogus fd_buffered_io=%d value\n", arg); ret = -EINVAL; @@ -659,6 +762,21 @@ static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 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; } @@ -675,10 +793,11 @@ static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 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\n", + 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"); + "Buffered-WCE" : "O_DSYNC", + !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); return bl; } @@ -702,46 +821,125 @@ static sector_t fd_get_blocks(struct se_device *dev) dev->dev_attrib.block_size); } -static struct sbc_ops fd_sbc_ops = { +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); + + 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 exec_cmd_ops fd_exec_cmd_ops = { .execute_rw = fd_execute_rw, .execute_sync_cache = fd_execute_sync_cache, .execute_write_same = fd_execute_write_same, - .execute_write_same_unmap = fd_execute_write_same_unmap, .execute_unmap = fd_execute_unmap, }; static sense_reason_t fd_parse_cdb(struct se_cmd *cmd) { - return sbc_parse_cdb(cmd, &fd_sbc_ops); + return sbc_parse_cdb(cmd, &fd_exec_cmd_ops); } -static struct se_subsystem_api fileio_template = { +static const struct target_backend_ops fileio_ops = { .name = "fileio", .inquiry_prod = "FILEIO", .inquiry_rev = FD_VERSION, .owner = THIS_MODULE, - .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, .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, + .configure_unmap = fd_configure_unmap, .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_subsystem_register(&fileio_template); + return transport_backend_register(&fileio_ops); } static void __exit fileio_module_exit(void) { - transport_subsystem_release(&fileio_template); + target_backend_unregister(&fileio_ops); } MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); |