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synced 2024-08-23 17:30:02 +00:00
![Mike Christie](/assets/img/avatar_default.png)
In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like "sg_write_same --ndob" we will crash in target_core_iblock/file's execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL. This patch adds a check for the NDOB bit in the common WRITE SAME code because we don't support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer. Link: https://lore.kernel.org/r/20220628022325.14627-2-michael.christie@oracle.com Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
956 lines
24 KiB
C
956 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* Filename: target_core_file.c
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*
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* This file contains the Storage Engine <-> FILEIO transport specific functions
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*
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* (c) Copyright 2005-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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******************************************************************************/
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/timer.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/falloc.h>
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#include <linux/uio.h>
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#include <linux/scatterlist.h>
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#include <scsi/scsi_proto.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include "target_core_file.h"
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static inline struct fd_dev *FD_DEV(struct se_device *dev)
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{
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return container_of(dev, struct fd_dev, dev);
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}
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static int fd_attach_hba(struct se_hba *hba, u32 host_id)
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{
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struct fd_host *fd_host;
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fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
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if (!fd_host) {
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pr_err("Unable to allocate memory for struct fd_host\n");
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return -ENOMEM;
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}
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fd_host->fd_host_id = host_id;
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hba->hba_ptr = fd_host;
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pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
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" Target Core Stack %s\n", hba->hba_id, FD_VERSION,
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TARGET_CORE_VERSION);
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pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
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hba->hba_id, fd_host->fd_host_id);
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return 0;
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}
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static void fd_detach_hba(struct se_hba *hba)
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{
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struct fd_host *fd_host = hba->hba_ptr;
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pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
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" Target Core\n", hba->hba_id, fd_host->fd_host_id);
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kfree(fd_host);
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hba->hba_ptr = NULL;
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}
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static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
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{
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struct fd_dev *fd_dev;
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struct fd_host *fd_host = hba->hba_ptr;
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fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
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if (!fd_dev) {
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pr_err("Unable to allocate memory for struct fd_dev\n");
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return NULL;
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}
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fd_dev->fd_host = fd_host;
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pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
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return &fd_dev->dev;
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}
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static int fd_configure_device(struct se_device *dev)
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{
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struct fd_dev *fd_dev = FD_DEV(dev);
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struct fd_host *fd_host = dev->se_hba->hba_ptr;
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struct file *file;
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struct inode *inode = NULL;
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int flags, ret = -EINVAL;
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if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
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pr_err("Missing fd_dev_name=\n");
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return -EINVAL;
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}
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/*
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* Use O_DSYNC by default instead of O_SYNC to forgo syncing
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* of pure timestamp updates.
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*/
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flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
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/*
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* Optionally allow fd_buffered_io=1 to be enabled for people
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* who want use the fs buffer cache as an WriteCache mechanism.
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*
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* This means that in event of a hard failure, there is a risk
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* of silent data-loss if the SCSI client has *not* performed a
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* forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
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* to write-out the entire device cache.
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*/
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if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
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pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
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flags &= ~O_DSYNC;
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}
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file = filp_open(fd_dev->fd_dev_name, flags, 0600);
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if (IS_ERR(file)) {
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pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
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ret = PTR_ERR(file);
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goto fail;
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}
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fd_dev->fd_file = file;
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/*
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* If using a block backend with this struct file, we extract
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* fd_dev->fd_[block,dev]_size from struct block_device.
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*
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* Otherwise, we use the passed fd_size= from configfs
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*/
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inode = file->f_mapping->host;
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if (S_ISBLK(inode->i_mode)) {
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struct block_device *bdev = I_BDEV(inode);
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unsigned long long dev_size;
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fd_dev->fd_block_size = bdev_logical_block_size(bdev);
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/*
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* Determine the number of bytes from i_size_read() minus
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* one (1) logical sector from underlying struct block_device
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*/
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dev_size = (i_size_read(file->f_mapping->host) -
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fd_dev->fd_block_size);
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pr_debug("FILEIO: Using size: %llu bytes from struct"
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" block_device blocks: %llu logical_block_size: %d\n",
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dev_size, div_u64(dev_size, fd_dev->fd_block_size),
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fd_dev->fd_block_size);
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if (target_configure_unmap_from_queue(&dev->dev_attrib, bdev))
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pr_debug("IFILE: BLOCK Discard support available,"
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" disabled by default\n");
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/*
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* Enable write same emulation for IBLOCK and use 0xFFFF as
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* the smaller WRITE_SAME(10) only has a two-byte block count.
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*/
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dev->dev_attrib.max_write_same_len = 0xFFFF;
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if (bdev_nonrot(bdev))
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dev->dev_attrib.is_nonrot = 1;
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} else {
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if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
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pr_err("FILEIO: Missing fd_dev_size="
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" parameter, and no backing struct"
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" block_device\n");
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goto fail;
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}
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fd_dev->fd_block_size = FD_BLOCKSIZE;
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/*
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* Limit UNMAP emulation to 8k Number of LBAs (NoLB)
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*/
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dev->dev_attrib.max_unmap_lba_count = 0x2000;
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/*
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* Currently hardcoded to 1 in Linux/SCSI code..
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*/
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dev->dev_attrib.max_unmap_block_desc_count = 1;
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dev->dev_attrib.unmap_granularity = 1;
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dev->dev_attrib.unmap_granularity_alignment = 0;
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/*
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* Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
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* based upon struct iovec limit for vfs_writev()
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*/
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dev->dev_attrib.max_write_same_len = 0x1000;
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}
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dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
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dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
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dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
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dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
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if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
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pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
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" with FDBD_HAS_BUFFERED_IO_WCE\n");
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dev->dev_attrib.emulate_write_cache = 1;
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}
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fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
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fd_dev->fd_queue_depth = dev->queue_depth;
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pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
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" %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
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fd_dev->fd_dev_name, fd_dev->fd_dev_size);
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return 0;
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fail:
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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return ret;
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}
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static void fd_dev_call_rcu(struct rcu_head *p)
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{
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struct se_device *dev = container_of(p, struct se_device, rcu_head);
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struct fd_dev *fd_dev = FD_DEV(dev);
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kfree(fd_dev);
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}
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static void fd_free_device(struct se_device *dev)
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{
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call_rcu(&dev->rcu_head, fd_dev_call_rcu);
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}
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static void fd_destroy_device(struct se_device *dev)
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{
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struct fd_dev *fd_dev = FD_DEV(dev);
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if (fd_dev->fd_file) {
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filp_close(fd_dev->fd_file, NULL);
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fd_dev->fd_file = NULL;
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}
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}
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struct target_core_file_cmd {
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unsigned long len;
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struct se_cmd *cmd;
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struct kiocb iocb;
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struct bio_vec bvecs[];
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};
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static void cmd_rw_aio_complete(struct kiocb *iocb, long ret)
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{
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struct target_core_file_cmd *cmd;
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cmd = container_of(iocb, struct target_core_file_cmd, iocb);
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if (ret != cmd->len)
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target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION);
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else
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target_complete_cmd(cmd->cmd, SAM_STAT_GOOD);
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kfree(cmd);
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}
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static sense_reason_t
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fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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enum dma_data_direction data_direction)
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{
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int is_write = !(data_direction == DMA_FROM_DEVICE);
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struct se_device *dev = cmd->se_dev;
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struct fd_dev *fd_dev = FD_DEV(dev);
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struct file *file = fd_dev->fd_file;
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struct target_core_file_cmd *aio_cmd;
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struct iov_iter iter;
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struct scatterlist *sg;
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ssize_t len = 0;
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int ret = 0, i;
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aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL);
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if (!aio_cmd)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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for_each_sg(sgl, sg, sgl_nents, i) {
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aio_cmd->bvecs[i].bv_page = sg_page(sg);
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aio_cmd->bvecs[i].bv_len = sg->length;
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aio_cmd->bvecs[i].bv_offset = sg->offset;
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len += sg->length;
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}
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iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len);
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aio_cmd->cmd = cmd;
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aio_cmd->len = len;
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aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size;
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aio_cmd->iocb.ki_filp = file;
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aio_cmd->iocb.ki_complete = cmd_rw_aio_complete;
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aio_cmd->iocb.ki_flags = IOCB_DIRECT;
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if (is_write && (cmd->se_cmd_flags & SCF_FUA))
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aio_cmd->iocb.ki_flags |= IOCB_DSYNC;
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if (is_write)
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ret = call_write_iter(file, &aio_cmd->iocb, &iter);
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else
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ret = call_read_iter(file, &aio_cmd->iocb, &iter);
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if (ret != -EIOCBQUEUED)
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cmd_rw_aio_complete(&aio_cmd->iocb, ret);
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return 0;
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}
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static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
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u32 block_size, struct scatterlist *sgl,
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u32 sgl_nents, u32 data_length, int is_write)
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{
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struct scatterlist *sg;
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struct iov_iter iter;
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struct bio_vec *bvec;
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ssize_t len = 0;
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loff_t pos = (cmd->t_task_lba * block_size);
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int ret = 0, i;
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bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
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if (!bvec) {
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pr_err("Unable to allocate fd_do_readv iov[]\n");
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return -ENOMEM;
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}
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for_each_sg(sgl, sg, sgl_nents, i) {
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bvec[i].bv_page = sg_page(sg);
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bvec[i].bv_len = sg->length;
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bvec[i].bv_offset = sg->offset;
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len += sg->length;
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}
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iov_iter_bvec(&iter, READ, bvec, sgl_nents, len);
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if (is_write)
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ret = vfs_iter_write(fd, &iter, &pos, 0);
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else
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ret = vfs_iter_read(fd, &iter, &pos, 0);
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if (is_write) {
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if (ret < 0 || ret != data_length) {
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pr_err("%s() write returned %d\n", __func__, ret);
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if (ret >= 0)
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ret = -EINVAL;
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}
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} else {
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/*
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* Return zeros and GOOD status even if the READ did not return
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* the expected virt_size for struct file w/o a backing struct
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* block_device.
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*/
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if (S_ISBLK(file_inode(fd)->i_mode)) {
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if (ret < 0 || ret != data_length) {
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pr_err("%s() returned %d, expecting %u for "
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"S_ISBLK\n", __func__, ret,
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data_length);
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if (ret >= 0)
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ret = -EINVAL;
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}
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} else {
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if (ret < 0) {
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pr_err("%s() returned %d for non S_ISBLK\n",
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__func__, ret);
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} else if (ret != data_length) {
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/*
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* Short read case:
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* Probably some one truncate file under us.
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* We must explicitly zero sg-pages to prevent
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* expose uninizialized pages to userspace.
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*/
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if (ret < data_length)
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ret += iov_iter_zero(data_length - ret, &iter);
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else
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ret = -EINVAL;
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}
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}
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}
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kfree(bvec);
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return ret;
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}
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static sense_reason_t
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fd_execute_sync_cache(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct fd_dev *fd_dev = FD_DEV(dev);
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int immed = (cmd->t_task_cdb[1] & 0x2);
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loff_t start, end;
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int ret;
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/*
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* If the Immediate bit is set, queue up the GOOD response
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* for this SYNCHRONIZE_CACHE op
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*/
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if (immed)
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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/*
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* Determine if we will be flushing the entire device.
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*/
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if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
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start = 0;
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end = LLONG_MAX;
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} else {
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start = cmd->t_task_lba * dev->dev_attrib.block_size;
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if (cmd->data_length)
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end = start + cmd->data_length - 1;
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else
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end = LLONG_MAX;
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}
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ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
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if (ret != 0)
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pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
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if (immed)
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return 0;
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if (ret)
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target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
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else
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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static sense_reason_t
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fd_execute_write_same(struct se_cmd *cmd)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct fd_dev *fd_dev = FD_DEV(se_dev);
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loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
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sector_t nolb = sbc_get_write_same_sectors(cmd);
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struct iov_iter iter;
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struct bio_vec *bvec;
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unsigned int len = 0, i;
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ssize_t ret;
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if (!nolb) {
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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if (cmd->prot_op) {
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pr_err("WRITE_SAME: Protection information with FILEIO"
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" backends not supported\n");
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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if (!cmd->t_data_nents)
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return TCM_INVALID_CDB_FIELD;
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if (cmd->t_data_nents > 1 ||
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cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
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pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
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" block_size: %u\n",
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cmd->t_data_nents,
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cmd->t_data_sg[0].length,
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cmd->se_dev->dev_attrib.block_size);
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return TCM_INVALID_CDB_FIELD;
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}
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bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
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if (!bvec)
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|
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, READ, 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);
|
|
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;
|
|
}
|
|
|
|
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 = I_BDEV(inode);
|
|
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);
|
|
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);
|
|
|
|
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_init(fileio_module_init);
|
|
module_exit(fileio_module_exit);
|