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953 lines
24 KiB
953 lines
24 KiB
// 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 <[email protected]> |
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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 request_queue *q = bdev_get_queue(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(I_BDEV(inode)); |
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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, q)) |
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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 (blk_queue_nonrot(q)) |
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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 > 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; |
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for (i = 0; i < nolb; i++) { |
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bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); |
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bvec[i].bv_len = cmd->t_data_sg[0].length; |
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bvec[i].bv_offset = cmd->t_data_sg[0].offset; |
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len += se_dev->dev_attrib.block_size; |
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} |
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iov_iter_bvec(&iter, READ, bvec, nolb, len); |
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ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); |
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kfree(bvec); |
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if (ret < 0 || ret != len) { |
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pr_err("vfs_iter_write() returned %zd for write same\n", ret); |
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
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} |
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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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|
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static int |
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fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, |
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void *buf, size_t bufsize) |
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{ |
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struct fd_dev *fd_dev = FD_DEV(se_dev); |
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struct file *prot_fd = fd_dev->fd_prot_file; |
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sector_t prot_length, prot; |
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loff_t pos = lba * se_dev->prot_length; |
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if (!prot_fd) { |
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pr_err("Unable to locate fd_dev->fd_prot_file\n"); |
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return -ENODEV; |
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} |
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prot_length = nolb * se_dev->prot_length; |
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memset(buf, 0xff, bufsize); |
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for (prot = 0; prot < prot_length;) { |
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sector_t len = min_t(sector_t, bufsize, prot_length - prot); |
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ssize_t ret = kernel_write(prot_fd, buf, len, &pos); |
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if (ret != len) { |
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pr_err("vfs_write to prot file failed: %zd\n", ret); |
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return ret < 0 ? ret : -ENODEV; |
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} |
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prot += ret; |
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} |
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return 0; |
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} |
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static int |
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fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
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{ |
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void *buf; |
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int rc; |
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|
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buf = (void *)__get_free_page(GFP_KERNEL); |
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if (!buf) { |
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pr_err("Unable to allocate FILEIO prot buf\n"); |
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return -ENOMEM; |
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} |
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rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); |
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|
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free_page((unsigned long)buf); |
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return rc; |
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} |
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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, 0); |
|
if (ret < 0) { |
|
pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", |
|
ret); |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
} else { |
|
/* The backend is normal file, use fallocate */ |
|
struct se_device *se_dev = cmd->se_dev; |
|
loff_t pos = lba * se_dev->dev_attrib.block_size; |
|
unsigned int len = nolb * se_dev->dev_attrib.block_size; |
|
int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; |
|
|
|
if (!file->f_op->fallocate) |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
|
|
ret = file->f_op->fallocate(file, mode, pos, len); |
|
if (ret < 0) { |
|
pr_warn("FILEIO: fallocate() failed: %d\n", ret); |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static sense_reason_t |
|
fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
|
enum dma_data_direction data_direction) |
|
{ |
|
struct se_device *dev = cmd->se_dev; |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
struct file *file = fd_dev->fd_file; |
|
struct file *pfile = fd_dev->fd_prot_file; |
|
sense_reason_t rc; |
|
int ret = 0; |
|
/* |
|
* Call vectorized fileio functions to map struct scatterlist |
|
* physical memory addresses to struct iovec virtual memory. |
|
*/ |
|
if (data_direction == DMA_FROM_DEVICE) { |
|
if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
|
ret = fd_do_rw(cmd, pfile, dev->prot_length, |
|
cmd->t_prot_sg, cmd->t_prot_nents, |
|
cmd->prot_length, 0); |
|
if (ret < 0) |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
|
|
ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, |
|
sgl, sgl_nents, cmd->data_length, 0); |
|
|
|
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && |
|
dev->dev_attrib.pi_prot_verify) { |
|
u32 sectors = cmd->data_length >> |
|
ilog2(dev->dev_attrib.block_size); |
|
|
|
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, |
|
0, cmd->t_prot_sg, 0); |
|
if (rc) |
|
return rc; |
|
} |
|
} else { |
|
if (cmd->prot_type && dev->dev_attrib.pi_prot_type && |
|
dev->dev_attrib.pi_prot_verify) { |
|
u32 sectors = cmd->data_length >> |
|
ilog2(dev->dev_attrib.block_size); |
|
|
|
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, |
|
0, cmd->t_prot_sg, 0); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, |
|
sgl, sgl_nents, cmd->data_length, 1); |
|
/* |
|
* Perform implicit vfs_fsync_range() for fd_do_writev() ops |
|
* for SCSI WRITEs with Forced Unit Access (FUA) set. |
|
* Allow this to happen independent of WCE=0 setting. |
|
*/ |
|
if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { |
|
loff_t start = cmd->t_task_lba * |
|
dev->dev_attrib.block_size; |
|
loff_t end; |
|
|
|
if (cmd->data_length) |
|
end = start + cmd->data_length - 1; |
|
else |
|
end = LLONG_MAX; |
|
|
|
vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
|
} |
|
|
|
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
|
ret = fd_do_rw(cmd, pfile, dev->prot_length, |
|
cmd->t_prot_sg, cmd->t_prot_nents, |
|
cmd->prot_length, 1); |
|
if (ret < 0) |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
} |
|
|
|
if (ret < 0) |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD); |
|
return 0; |
|
} |
|
|
|
static sense_reason_t |
|
fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
|
enum dma_data_direction data_direction) |
|
{ |
|
struct se_device *dev = cmd->se_dev; |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
|
|
/* |
|
* We are currently limited by the number of iovecs (2048) per |
|
* single vfs_[writev,readv] call. |
|
*/ |
|
if (cmd->data_length > FD_MAX_BYTES) { |
|
pr_err("FILEIO: Not able to process I/O of %u bytes due to" |
|
"FD_MAX_BYTES: %u iovec count limitation\n", |
|
cmd->data_length, FD_MAX_BYTES); |
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
|
} |
|
|
|
if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO) |
|
return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction); |
|
return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction); |
|
} |
|
|
|
enum { |
|
Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, |
|
Opt_fd_async_io, Opt_err |
|
}; |
|
|
|
static match_table_t tokens = { |
|
{Opt_fd_dev_name, "fd_dev_name=%s"}, |
|
{Opt_fd_dev_size, "fd_dev_size=%s"}, |
|
{Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
|
{Opt_fd_async_io, "fd_async_io=%d"}, |
|
{Opt_err, NULL} |
|
}; |
|
|
|
static ssize_t fd_set_configfs_dev_params(struct se_device *dev, |
|
const char *page, ssize_t count) |
|
{ |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
char *orig, *ptr, *arg_p, *opts; |
|
substring_t args[MAX_OPT_ARGS]; |
|
int ret = 0, arg, token; |
|
|
|
opts = kstrdup(page, GFP_KERNEL); |
|
if (!opts) |
|
return -ENOMEM; |
|
|
|
orig = opts; |
|
|
|
while ((ptr = strsep(&opts, ",\n")) != NULL) { |
|
if (!*ptr) |
|
continue; |
|
|
|
token = match_token(ptr, tokens, args); |
|
switch (token) { |
|
case Opt_fd_dev_name: |
|
if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
|
FD_MAX_DEV_NAME) == 0) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
pr_debug("FILEIO: Referencing Path: %s\n", |
|
fd_dev->fd_dev_name); |
|
fd_dev->fbd_flags |= FBDF_HAS_PATH; |
|
break; |
|
case Opt_fd_dev_size: |
|
arg_p = match_strdup(&args[0]); |
|
if (!arg_p) { |
|
ret = -ENOMEM; |
|
break; |
|
} |
|
ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); |
|
kfree(arg_p); |
|
if (ret < 0) { |
|
pr_err("kstrtoull() failed for" |
|
" fd_dev_size=\n"); |
|
goto out; |
|
} |
|
pr_debug("FILEIO: Referencing Size: %llu" |
|
" bytes\n", fd_dev->fd_dev_size); |
|
fd_dev->fbd_flags |= FBDF_HAS_SIZE; |
|
break; |
|
case Opt_fd_buffered_io: |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
if (arg != 1) { |
|
pr_err("bogus fd_buffered_io=%d value\n", arg); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
pr_debug("FILEIO: Using buffered I/O" |
|
" operations for struct fd_dev\n"); |
|
|
|
fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; |
|
break; |
|
case Opt_fd_async_io: |
|
ret = match_int(args, &arg); |
|
if (ret) |
|
goto out; |
|
if (arg != 1) { |
|
pr_err("bogus fd_async_io=%d value\n", arg); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
pr_debug("FILEIO: Using async I/O" |
|
" operations for struct fd_dev\n"); |
|
|
|
fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO; |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
out: |
|
kfree(orig); |
|
return (!ret) ? count : ret; |
|
} |
|
|
|
static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) |
|
{ |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
ssize_t bl = 0; |
|
|
|
bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); |
|
bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n", |
|
fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
|
(fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? |
|
"Buffered-WCE" : "O_DSYNC", |
|
!!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); |
|
return bl; |
|
} |
|
|
|
static sector_t fd_get_blocks(struct se_device *dev) |
|
{ |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
struct file *f = fd_dev->fd_file; |
|
struct inode *i = f->f_mapping->host; |
|
unsigned long long dev_size; |
|
/* |
|
* When using a file that references an underlying struct block_device, |
|
* ensure dev_size is always based on the current inode size in order |
|
* to handle underlying block_device resize operations. |
|
*/ |
|
if (S_ISBLK(i->i_mode)) |
|
dev_size = i_size_read(i); |
|
else |
|
dev_size = fd_dev->fd_dev_size; |
|
|
|
return div_u64(dev_size - dev->dev_attrib.block_size, |
|
dev->dev_attrib.block_size); |
|
} |
|
|
|
static int fd_init_prot(struct se_device *dev) |
|
{ |
|
struct fd_dev *fd_dev = FD_DEV(dev); |
|
struct file *prot_file, *file = fd_dev->fd_file; |
|
struct inode *inode; |
|
int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
|
char buf[FD_MAX_DEV_PROT_NAME]; |
|
|
|
if (!file) { |
|
pr_err("Unable to locate fd_dev->fd_file\n"); |
|
return -ENODEV; |
|
} |
|
|
|
inode = file->f_mapping->host; |
|
if (S_ISBLK(inode->i_mode)) { |
|
pr_err("FILEIO Protection emulation only supported on" |
|
" !S_ISBLK\n"); |
|
return -ENOSYS; |
|
} |
|
|
|
if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) |
|
flags &= ~O_DSYNC; |
|
|
|
snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", |
|
fd_dev->fd_dev_name); |
|
|
|
prot_file = filp_open(buf, flags, 0600); |
|
if (IS_ERR(prot_file)) { |
|
pr_err("filp_open(%s) failed\n", buf); |
|
ret = PTR_ERR(prot_file); |
|
return ret; |
|
} |
|
fd_dev->fd_prot_file = prot_file; |
|
|
|
return 0; |
|
} |
|
|
|
static int fd_format_prot(struct se_device *dev) |
|
{ |
|
unsigned char *buf; |
|
int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; |
|
int ret; |
|
|
|
if (!dev->dev_attrib.pi_prot_type) { |
|
pr_err("Unable to format_prot while pi_prot_type == 0\n"); |
|
return -ENODEV; |
|
} |
|
|
|
buf = vzalloc(unit_size); |
|
if (!buf) { |
|
pr_err("Unable to allocate FILEIO prot buf\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
pr_debug("Using FILEIO prot_length: %llu\n", |
|
(unsigned long long)(dev->transport->get_blocks(dev) + 1) * |
|
dev->prot_length); |
|
|
|
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("[email protected]"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(fileio_module_init); |
|
module_exit(fileio_module_exit);
|
|
|