1c66ac9dbSNicholas Bellinger /******************************************************************************* 2c66ac9dbSNicholas Bellinger * Filename: target_core_file.c 3c66ac9dbSNicholas Bellinger * 4c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> FILEIO transport specific functions 5c66ac9dbSNicholas Bellinger * 64c76251eSNicholas Bellinger * (c) Copyright 2005-2013 Datera, Inc. 7c66ac9dbSNicholas Bellinger * 8c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 9c66ac9dbSNicholas Bellinger * 10c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 11c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 12c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 13c66ac9dbSNicholas Bellinger * (at your option) any later version. 14c66ac9dbSNicholas Bellinger * 15c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 16c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 17c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 19c66ac9dbSNicholas Bellinger * 20c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 21c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 22c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23c66ac9dbSNicholas Bellinger * 24c66ac9dbSNicholas Bellinger ******************************************************************************/ 25c66ac9dbSNicholas Bellinger 26c66ac9dbSNicholas Bellinger #include <linux/string.h> 27c66ac9dbSNicholas Bellinger #include <linux/parser.h> 28c66ac9dbSNicholas Bellinger #include <linux/timer.h> 29c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 30c66ac9dbSNicholas Bellinger #include <linux/slab.h> 31c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 32827509e3SPaul Gortmaker #include <linux/module.h> 335538d294SDavid S. Miller #include <linux/vmalloc.h> 3470d3ae5cSAsias He #include <linux/falloc.h> 358dcf07beSBart Van Assche #include <linux/uio.h> 36ba929992SBart Van Assche #include <scsi/scsi_proto.h> 3750642762SAsias He #include <asm/unaligned.h> 38c66ac9dbSNicholas Bellinger 39c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 40c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 41c66ac9dbSNicholas Bellinger 42c66ac9dbSNicholas Bellinger #include "target_core_file.h" 43c66ac9dbSNicholas Bellinger 440fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev) 450fd97ccfSChristoph Hellwig { 460fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev); 470fd97ccfSChristoph Hellwig } 48c66ac9dbSNicholas Bellinger 49c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id) 50c66ac9dbSNicholas Bellinger { 51c66ac9dbSNicholas Bellinger struct fd_host *fd_host; 52c66ac9dbSNicholas Bellinger 53c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 546708bb27SAndy Grover if (!fd_host) { 556708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n"); 56e3d6f909SAndy Grover return -ENOMEM; 57c66ac9dbSNicholas Bellinger } 58c66ac9dbSNicholas Bellinger 59c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id; 60c66ac9dbSNicholas Bellinger 61e3d6f909SAndy Grover hba->hba_ptr = fd_host; 62c66ac9dbSNicholas Bellinger 636708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 64c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 65ce8dd25dSChristoph Hellwig TARGET_CORE_VERSION); 6695cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 6795cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id); 68c66ac9dbSNicholas Bellinger 69c66ac9dbSNicholas Bellinger return 0; 70c66ac9dbSNicholas Bellinger } 71c66ac9dbSNicholas Bellinger 72c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba) 73c66ac9dbSNicholas Bellinger { 74c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr; 75c66ac9dbSNicholas Bellinger 766708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 77c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id); 78c66ac9dbSNicholas Bellinger 79c66ac9dbSNicholas Bellinger kfree(fd_host); 80c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL; 81c66ac9dbSNicholas Bellinger } 82c66ac9dbSNicholas Bellinger 830fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 84c66ac9dbSNicholas Bellinger { 85c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev; 868359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr; 87c66ac9dbSNicholas Bellinger 88c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 896708bb27SAndy Grover if (!fd_dev) { 906708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n"); 91c66ac9dbSNicholas Bellinger return NULL; 92c66ac9dbSNicholas Bellinger } 93c66ac9dbSNicholas Bellinger 94c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host; 95c66ac9dbSNicholas Bellinger 966708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 97c66ac9dbSNicholas Bellinger 980fd97ccfSChristoph Hellwig return &fd_dev->dev; 99c66ac9dbSNicholas Bellinger } 100c66ac9dbSNicholas Bellinger 1010fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev) 102c66ac9dbSNicholas Bellinger { 1030fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 1040fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr; 105c66ac9dbSNicholas Bellinger struct file *file; 106c66ac9dbSNicholas Bellinger struct inode *inode = NULL; 1070fd97ccfSChristoph Hellwig int flags, ret = -EINVAL; 108c66ac9dbSNicholas Bellinger 1090fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 1100fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n"); 1110fd97ccfSChristoph Hellwig return -EINVAL; 1120fd97ccfSChristoph Hellwig } 113c66ac9dbSNicholas Bellinger 114c66ac9dbSNicholas Bellinger /* 115a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing 116a4dff304SNicholas Bellinger * of pure timestamp updates. 117c66ac9dbSNicholas Bellinger */ 118a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 1190fd97ccfSChristoph Hellwig 120b32f4c7eSNicholas Bellinger /* 121b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people 122b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism. 123b32f4c7eSNicholas Bellinger * 124b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk 125b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a 126b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 127b32f4c7eSNicholas Bellinger * to write-out the entire device cache. 128b32f4c7eSNicholas Bellinger */ 129b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 130b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 131b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC; 132b32f4c7eSNicholas Bellinger } 133c66ac9dbSNicholas Bellinger 134dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600); 135613640e4SNicholas Bellinger if (IS_ERR(file)) { 136dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 137613640e4SNicholas Bellinger ret = PTR_ERR(file); 138613640e4SNicholas Bellinger goto fail; 139613640e4SNicholas Bellinger } 140c66ac9dbSNicholas Bellinger fd_dev->fd_file = file; 141c66ac9dbSNicholas Bellinger /* 142c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract 143c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device. 144c66ac9dbSNicholas Bellinger * 145c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs 146c66ac9dbSNicholas Bellinger */ 147c66ac9dbSNicholas Bellinger inode = file->f_mapping->host; 148c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 1490fd97ccfSChristoph Hellwig struct request_queue *q = bdev_get_queue(inode->i_bdev); 150cd9323fdSNicholas Bellinger unsigned long long dev_size; 1510fd97ccfSChristoph Hellwig 15221363ca8SNicholas Bellinger fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 153c66ac9dbSNicholas Bellinger /* 154c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus 155c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device 156c66ac9dbSNicholas Bellinger */ 157cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) - 158c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 159c66ac9dbSNicholas Bellinger 1606708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct" 161c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n", 162cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size), 163c66ac9dbSNicholas Bellinger fd_dev->fd_block_size); 1648a9ebe71SMike Christie 165ea263c7fSMike Christie if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) 16670d3ae5cSAsias He pr_debug("IFILE: BLOCK Discard support available," 16770d3ae5cSAsias He " disabled by default\n"); 16870d3ae5cSAsias He /* 16970d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as 17070d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count. 17170d3ae5cSAsias He */ 17270d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF; 1730463a3feSAsias He 1740463a3feSAsias He if (blk_queue_nonrot(q)) 1750463a3feSAsias He dev->dev_attrib.is_nonrot = 1; 176c66ac9dbSNicholas Bellinger } else { 177c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 1786708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size=" 179c66ac9dbSNicholas Bellinger " parameter, and no backing struct" 180c66ac9dbSNicholas Bellinger " block_device\n"); 181c66ac9dbSNicholas Bellinger goto fail; 182c66ac9dbSNicholas Bellinger } 183c66ac9dbSNicholas Bellinger 18421363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE; 18570d3ae5cSAsias He /* 18670d3ae5cSAsias He * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 18770d3ae5cSAsias He */ 18870d3ae5cSAsias He dev->dev_attrib.max_unmap_lba_count = 0x2000; 18970d3ae5cSAsias He /* 19070d3ae5cSAsias He * Currently hardcoded to 1 in Linux/SCSI code.. 19170d3ae5cSAsias He */ 19270d3ae5cSAsias He dev->dev_attrib.max_unmap_block_desc_count = 1; 19370d3ae5cSAsias He dev->dev_attrib.unmap_granularity = 1; 19470d3ae5cSAsias He dev->dev_attrib.unmap_granularity_alignment = 0; 19570d3ae5cSAsias He 19670d3ae5cSAsias He /* 19770d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 19870d3ae5cSAsias He * based upon struct iovec limit for vfs_writev() 19970d3ae5cSAsias He */ 20070d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000; 201c66ac9dbSNicholas Bellinger } 202c66ac9dbSNicholas Bellinger 20321363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 20495cadaceSNicholas Bellinger dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 20595cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 2060fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 207c66ac9dbSNicholas Bellinger 208b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 209b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 210b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n"); 2110fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1; 212b32f4c7eSNicholas Bellinger } 213b32f4c7eSNicholas Bellinger 214c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 215c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth; 216c66ac9dbSNicholas Bellinger 2176708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 218c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 219c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size); 220c66ac9dbSNicholas Bellinger 2210fd97ccfSChristoph Hellwig return 0; 222c66ac9dbSNicholas Bellinger fail: 223c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 224c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 225c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 226c66ac9dbSNicholas Bellinger } 2270fd97ccfSChristoph Hellwig return ret; 228c66ac9dbSNicholas Bellinger } 229c66ac9dbSNicholas Bellinger 2304cc987eaSNicholas Bellinger static void fd_dev_call_rcu(struct rcu_head *p) 2314cc987eaSNicholas Bellinger { 2324cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 2334cc987eaSNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 2344cc987eaSNicholas Bellinger 2354cc987eaSNicholas Bellinger kfree(fd_dev); 2364cc987eaSNicholas Bellinger } 2374cc987eaSNicholas Bellinger 2380fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev) 239c66ac9dbSNicholas Bellinger { 24092634706SMike Christie call_rcu(&dev->rcu_head, fd_dev_call_rcu); 24192634706SMike Christie } 24292634706SMike Christie 24392634706SMike Christie static void fd_destroy_device(struct se_device *dev) 24492634706SMike Christie { 2450fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 246c66ac9dbSNicholas Bellinger 247c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) { 248c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL); 249c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL; 250c66ac9dbSNicholas Bellinger } 251c66ac9dbSNicholas Bellinger } 252c66ac9dbSNicholas Bellinger 2538287fa5fSSagi Grimberg static int fd_do_rw(struct se_cmd *cmd, struct file *fd, 2548287fa5fSSagi Grimberg u32 block_size, struct scatterlist *sgl, 2558287fa5fSSagi Grimberg u32 sgl_nents, u32 data_length, int is_write) 25642201b55SNicholas Bellinger { 2575787cacdSChristoph Hellwig struct scatterlist *sg; 2586b9a44d0SChristoph Hellwig struct iov_iter iter; 2596b9a44d0SChristoph Hellwig struct bio_vec *bvec; 2606b9a44d0SChristoph Hellwig ssize_t len = 0; 2618287fa5fSSagi Grimberg loff_t pos = (cmd->t_task_lba * block_size); 262c66ac9dbSNicholas Bellinger int ret = 0, i; 263c66ac9dbSNicholas Bellinger 2646b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 2656b9a44d0SChristoph Hellwig if (!bvec) { 2666708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n"); 267e3d6f909SAndy Grover return -ENOMEM; 268c66ac9dbSNicholas Bellinger } 269c66ac9dbSNicholas Bellinger 2705787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 2716b9a44d0SChristoph Hellwig bvec[i].bv_page = sg_page(sg); 2726b9a44d0SChristoph Hellwig bvec[i].bv_len = sg->length; 2736b9a44d0SChristoph Hellwig bvec[i].bv_offset = sg->offset; 2746b9a44d0SChristoph Hellwig 2756b9a44d0SChristoph Hellwig len += sg->length; 276c66ac9dbSNicholas Bellinger } 277c66ac9dbSNicholas Bellinger 2786b9a44d0SChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len); 279778229afSSebastian Andrzej Siewior if (is_write) 2806b9a44d0SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos); 281778229afSSebastian Andrzej Siewior else 2826b9a44d0SChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos); 283778229afSSebastian Andrzej Siewior 284778229afSSebastian Andrzej Siewior if (is_write) { 2858287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 286778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret); 287f11b55d1SDmitry Monakhov if (ret >= 0) 288f11b55d1SDmitry Monakhov ret = -EINVAL; 289778229afSSebastian Andrzej Siewior } 290778229afSSebastian Andrzej Siewior } else { 291c66ac9dbSNicholas Bellinger /* 292c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return 293c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct 294c66ac9dbSNicholas Bellinger * block_device. 295c66ac9dbSNicholas Bellinger */ 296496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) { 2978287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) { 298778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for " 299778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret, 3008287fa5fSSagi Grimberg data_length); 301f11b55d1SDmitry Monakhov if (ret >= 0) 302f11b55d1SDmitry Monakhov ret = -EINVAL; 303c66ac9dbSNicholas Bellinger } 304c66ac9dbSNicholas Bellinger } else { 305c66ac9dbSNicholas Bellinger if (ret < 0) { 306778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n", 307778229afSSebastian Andrzej Siewior __func__, ret); 308f11b55d1SDmitry Monakhov } else if (ret != data_length) { 309f11b55d1SDmitry Monakhov /* 310f11b55d1SDmitry Monakhov * Short read case: 311f11b55d1SDmitry Monakhov * Probably some one truncate file under us. 312f11b55d1SDmitry Monakhov * We must explicitly zero sg-pages to prevent 313f11b55d1SDmitry Monakhov * expose uninizialized pages to userspace. 314f11b55d1SDmitry Monakhov */ 315f11b55d1SDmitry Monakhov if (ret < data_length) 316f11b55d1SDmitry Monakhov ret += iov_iter_zero(data_length - ret, &iter); 317f11b55d1SDmitry Monakhov else 318f11b55d1SDmitry Monakhov ret = -EINVAL; 319f11b55d1SDmitry Monakhov } 320f11b55d1SDmitry Monakhov } 321f11b55d1SDmitry Monakhov } 322f11b55d1SDmitry Monakhov kfree(bvec); 323e3d6f909SAndy Grover return ret; 324c66ac9dbSNicholas Bellinger } 325c66ac9dbSNicholas Bellinger 326de103c93SChristoph Hellwig static sense_reason_t 327de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd) 328c66ac9dbSNicholas Bellinger { 329c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 3300fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 331a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 332c66ac9dbSNicholas Bellinger loff_t start, end; 333c66ac9dbSNicholas Bellinger int ret; 334c66ac9dbSNicholas Bellinger 335c66ac9dbSNicholas Bellinger /* 336c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 337c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op 338c66ac9dbSNicholas Bellinger */ 339c66ac9dbSNicholas Bellinger if (immed) 3405787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 341c66ac9dbSNicholas Bellinger 342c66ac9dbSNicholas Bellinger /* 343c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device. 344c66ac9dbSNicholas Bellinger */ 345a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 346c66ac9dbSNicholas Bellinger start = 0; 347c66ac9dbSNicholas Bellinger end = LLONG_MAX; 348c66ac9dbSNicholas Bellinger } else { 3490fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size; 350c66ac9dbSNicholas Bellinger if (cmd->data_length) 35162d3ab49SZach Brown end = start + cmd->data_length - 1; 352c66ac9dbSNicholas Bellinger else 353c66ac9dbSNicholas Bellinger end = LLONG_MAX; 354c66ac9dbSNicholas Bellinger } 355c66ac9dbSNicholas Bellinger 356c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 357c66ac9dbSNicholas Bellinger if (ret != 0) 3586708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 359c66ac9dbSNicholas Bellinger 3605787cacdSChristoph Hellwig if (immed) 361ad67f0d9SChristoph Hellwig return 0; 3625787cacdSChristoph Hellwig 363de103c93SChristoph Hellwig if (ret) 3645787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 365de103c93SChristoph Hellwig else 3665787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 367ad67f0d9SChristoph Hellwig 368ad67f0d9SChristoph Hellwig return 0; 369c66ac9dbSNicholas Bellinger } 370c66ac9dbSNicholas Bellinger 3717b745c84SNicholas Bellinger static sense_reason_t 3727b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd) 3737b745c84SNicholas Bellinger { 3747b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev; 3757b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev); 3767b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 377d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 378d4c5dcacSChristoph Hellwig struct iov_iter iter; 379d4c5dcacSChristoph Hellwig struct bio_vec *bvec; 380d4c5dcacSChristoph Hellwig unsigned int len = 0, i; 381d4c5dcacSChristoph Hellwig ssize_t ret; 3827b745c84SNicholas Bellinger 3837b745c84SNicholas Bellinger if (!nolb) { 3847b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 3857b745c84SNicholas Bellinger return 0; 3867b745c84SNicholas Bellinger } 387afd73f1bSNicholas Bellinger if (cmd->prot_op) { 388afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO" 389afd73f1bSNicholas Bellinger " backends not supported\n"); 390afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 391afd73f1bSNicholas Bellinger } 3927b745c84SNicholas Bellinger 3937b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 || 394d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 3957b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 396d4c5dcacSChristoph Hellwig " block_size: %u\n", 397d4c5dcacSChristoph Hellwig cmd->t_data_nents, 398d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length, 3997b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 4007b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 4017b745c84SNicholas Bellinger } 4027b745c84SNicholas Bellinger 403d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 404d4c5dcacSChristoph Hellwig if (!bvec) 4057b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4067b745c84SNicholas Bellinger 407d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) { 408d4c5dcacSChristoph Hellwig bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 409d4c5dcacSChristoph Hellwig bvec[i].bv_len = cmd->t_data_sg[0].length; 410d4c5dcacSChristoph Hellwig bvec[i].bv_offset = cmd->t_data_sg[0].offset; 411d4c5dcacSChristoph Hellwig 412d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size; 4137b745c84SNicholas Bellinger } 4147b745c84SNicholas Bellinger 415d4c5dcacSChristoph Hellwig iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len); 416d4c5dcacSChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos); 4177b745c84SNicholas Bellinger 418d4c5dcacSChristoph Hellwig kfree(bvec); 419d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) { 420d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret); 4217b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4227b745c84SNicholas Bellinger } 4237b745c84SNicholas Bellinger 4247b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD); 4257b745c84SNicholas Bellinger return 0; 4267b745c84SNicholas Bellinger } 4277b745c84SNicholas Bellinger 42864d240b7SAkinobu Mita static int 42964d240b7SAkinobu Mita fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, 43064d240b7SAkinobu Mita void *buf, size_t bufsize) 43164d240b7SAkinobu Mita { 43264d240b7SAkinobu Mita struct fd_dev *fd_dev = FD_DEV(se_dev); 43364d240b7SAkinobu Mita struct file *prot_fd = fd_dev->fd_prot_file; 43464d240b7SAkinobu Mita sector_t prot_length, prot; 43564d240b7SAkinobu Mita loff_t pos = lba * se_dev->prot_length; 43664d240b7SAkinobu Mita 43764d240b7SAkinobu Mita if (!prot_fd) { 43864d240b7SAkinobu Mita pr_err("Unable to locate fd_dev->fd_prot_file\n"); 43964d240b7SAkinobu Mita return -ENODEV; 44064d240b7SAkinobu Mita } 44164d240b7SAkinobu Mita 44264d240b7SAkinobu Mita prot_length = nolb * se_dev->prot_length; 44364d240b7SAkinobu Mita 44464d240b7SAkinobu Mita for (prot = 0; prot < prot_length;) { 44564d240b7SAkinobu Mita sector_t len = min_t(sector_t, bufsize, prot_length - prot); 44664d240b7SAkinobu Mita ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot); 44764d240b7SAkinobu Mita 44864d240b7SAkinobu Mita if (ret != len) { 44964d240b7SAkinobu Mita pr_err("vfs_write to prot file failed: %zd\n", ret); 45064d240b7SAkinobu Mita return ret < 0 ? ret : -ENODEV; 45164d240b7SAkinobu Mita } 45264d240b7SAkinobu Mita prot += ret; 45364d240b7SAkinobu Mita } 45464d240b7SAkinobu Mita 45564d240b7SAkinobu Mita return 0; 45664d240b7SAkinobu Mita } 45764d240b7SAkinobu Mita 45864d240b7SAkinobu Mita static int 45964d240b7SAkinobu Mita fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 46064d240b7SAkinobu Mita { 46164d240b7SAkinobu Mita void *buf; 46264d240b7SAkinobu Mita int rc; 46364d240b7SAkinobu Mita 46464d240b7SAkinobu Mita buf = (void *)__get_free_page(GFP_KERNEL); 46564d240b7SAkinobu Mita if (!buf) { 46664d240b7SAkinobu Mita pr_err("Unable to allocate FILEIO prot buf\n"); 46764d240b7SAkinobu Mita return -ENOMEM; 46864d240b7SAkinobu Mita } 46964d240b7SAkinobu Mita memset(buf, 0xff, PAGE_SIZE); 47064d240b7SAkinobu Mita 47164d240b7SAkinobu Mita rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); 47264d240b7SAkinobu Mita 47364d240b7SAkinobu Mita free_page((unsigned long)buf); 47464d240b7SAkinobu Mita 47564d240b7SAkinobu Mita return rc; 47664d240b7SAkinobu Mita } 47764d240b7SAkinobu Mita 478de103c93SChristoph Hellwig static sense_reason_t 47962e46942SChristoph Hellwig fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 48070d3ae5cSAsias He { 48162e46942SChristoph Hellwig struct file *file = FD_DEV(cmd->se_dev)->fd_file; 48270d3ae5cSAsias He struct inode *inode = file->f_mapping->host; 48370d3ae5cSAsias He int ret; 48470d3ae5cSAsias He 48564d240b7SAkinobu Mita if (cmd->se_dev->dev_attrib.pi_prot_type) { 48664d240b7SAkinobu Mita ret = fd_do_prot_unmap(cmd, lba, nolb); 48764d240b7SAkinobu Mita if (ret) 48864d240b7SAkinobu Mita return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 48964d240b7SAkinobu Mita } 49064d240b7SAkinobu Mita 49170d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) { 49270d3ae5cSAsias He /* The backend is block device, use discard */ 49370d3ae5cSAsias He struct block_device *bdev = inode->i_bdev; 4948a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 49570d3ae5cSAsias He 4968a9ebe71SMike Christie ret = blkdev_issue_discard(bdev, 4978a9ebe71SMike Christie target_to_linux_sector(dev, lba), 4988a9ebe71SMike Christie target_to_linux_sector(dev, nolb), 4998a9ebe71SMike Christie GFP_KERNEL, 0); 50070d3ae5cSAsias He if (ret < 0) { 50170d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 50270d3ae5cSAsias He ret); 50370d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 50470d3ae5cSAsias He } 50570d3ae5cSAsias He } else { 50670d3ae5cSAsias He /* The backend is normal file, use fallocate */ 50743f55bbbSAsias He struct se_device *se_dev = cmd->se_dev; 50843f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size; 50970d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size; 51070d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 51170d3ae5cSAsias He 51270d3ae5cSAsias He if (!file->f_op->fallocate) 51370d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51470d3ae5cSAsias He 51570d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len); 51670d3ae5cSAsias He if (ret < 0) { 51770d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret); 51870d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 51970d3ae5cSAsias He } 52070d3ae5cSAsias He } 52170d3ae5cSAsias He 52243f55bbbSAsias He return 0; 52343f55bbbSAsias He } 52443f55bbbSAsias He 52543f55bbbSAsias He static sense_reason_t 526a82a9538SNicholas Bellinger fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 527a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 528c66ac9dbSNicholas Bellinger { 529c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev; 5308287fa5fSSagi Grimberg struct fd_dev *fd_dev = FD_DEV(dev); 5318287fa5fSSagi Grimberg struct file *file = fd_dev->fd_file; 5328287fa5fSSagi Grimberg struct file *pfile = fd_dev->fd_prot_file; 53342201b55SNicholas Bellinger sense_reason_t rc; 534c66ac9dbSNicholas Bellinger int ret = 0; 535046ba642SNicholas Bellinger /* 536046ba642SNicholas Bellinger * We are currently limited by the number of iovecs (2048) per 537046ba642SNicholas Bellinger * single vfs_[writev,readv] call. 538046ba642SNicholas Bellinger */ 539046ba642SNicholas Bellinger if (cmd->data_length > FD_MAX_BYTES) { 540046ba642SNicholas Bellinger pr_err("FILEIO: Not able to process I/O of %u bytes due to" 541291e3e51SColin Ian King "FD_MAX_BYTES: %u iovec count limitation\n", 542046ba642SNicholas Bellinger cmd->data_length, FD_MAX_BYTES); 543046ba642SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 544046ba642SNicholas Bellinger } 545c66ac9dbSNicholas Bellinger /* 546c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist 547c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory. 548c66ac9dbSNicholas Bellinger */ 5495787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) { 550ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 5518287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 5528287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 5538287fa5fSSagi Grimberg cmd->prot_length, 0); 55442201b55SNicholas Bellinger if (ret < 0) 55542201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 55642201b55SNicholas Bellinger } 55742201b55SNicholas Bellinger 5588287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 5598287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 0); 56042201b55SNicholas Bellinger 561056e8924SDmitry Monakhov if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && 562056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) { 5638287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5648287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 56542201b55SNicholas Bellinger 566f75b6faeSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 567f75b6faeSSagi Grimberg 0, cmd->t_prot_sg, 0); 5688287fa5fSSagi Grimberg if (rc) 56942201b55SNicholas Bellinger return rc; 57042201b55SNicholas Bellinger } 571c66ac9dbSNicholas Bellinger } else { 572056e8924SDmitry Monakhov if (cmd->prot_type && dev->dev_attrib.pi_prot_type && 573056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) { 5748287fa5fSSagi Grimberg u32 sectors = cmd->data_length >> 5758287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size); 57642201b55SNicholas Bellinger 5778287fa5fSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 5788287fa5fSSagi Grimberg 0, cmd->t_prot_sg, 0); 5798287fa5fSSagi Grimberg if (rc) 58042201b55SNicholas Bellinger return rc; 58142201b55SNicholas Bellinger } 58242201b55SNicholas Bellinger 5838287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 5848287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 1); 585a4dff304SNicholas Bellinger /* 586125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops 587a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set. 588a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting. 589a4dff304SNicholas Bellinger */ 590814e5b45SChristoph Hellwig if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { 591a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba * 5920fd97ccfSChristoph Hellwig dev->dev_attrib.block_size; 59362d3ab49SZach Brown loff_t end; 59462d3ab49SZach Brown 59562d3ab49SZach Brown if (cmd->data_length) 59662d3ab49SZach Brown end = start + cmd->data_length - 1; 59762d3ab49SZach Brown else 59862d3ab49SZach Brown end = LLONG_MAX; 599c66ac9dbSNicholas Bellinger 600a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1); 601a4dff304SNicholas Bellinger } 602c66ac9dbSNicholas Bellinger 603ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 6048287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length, 6058287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents, 6068287fa5fSSagi Grimberg cmd->prot_length, 1); 607de103c93SChristoph Hellwig if (ret < 0) 608de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 60942201b55SNicholas Bellinger } 61042201b55SNicholas Bellinger } 61142201b55SNicholas Bellinger 6128287fa5fSSagi Grimberg if (ret < 0) 61342201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 614de103c93SChristoph Hellwig 6155787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 61603e98c9eSNicholas Bellinger return 0; 617c66ac9dbSNicholas Bellinger } 618c66ac9dbSNicholas Bellinger 619c66ac9dbSNicholas Bellinger enum { 620c66ac9dbSNicholas Bellinger Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 621c66ac9dbSNicholas Bellinger }; 622c66ac9dbSNicholas Bellinger 623c66ac9dbSNicholas Bellinger static match_table_t tokens = { 624c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"}, 625c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"}, 626b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 627c66ac9dbSNicholas Bellinger {Opt_err, NULL} 628c66ac9dbSNicholas Bellinger }; 629c66ac9dbSNicholas Bellinger 6300fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 631c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 632c66ac9dbSNicholas Bellinger { 6330fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 634c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts; 635c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 636b32f4c7eSNicholas Bellinger int ret = 0, arg, token; 637c66ac9dbSNicholas Bellinger 638c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 639c66ac9dbSNicholas Bellinger if (!opts) 640c66ac9dbSNicholas Bellinger return -ENOMEM; 641c66ac9dbSNicholas Bellinger 642c66ac9dbSNicholas Bellinger orig = opts; 643c66ac9dbSNicholas Bellinger 64490c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 645c66ac9dbSNicholas Bellinger if (!*ptr) 646c66ac9dbSNicholas Bellinger continue; 647c66ac9dbSNicholas Bellinger 648c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 649c66ac9dbSNicholas Bellinger switch (token) { 650c66ac9dbSNicholas Bellinger case Opt_fd_dev_name: 651dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 652dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) { 653dbc6e022SAl Viro ret = -EINVAL; 6546d180253SJesper Juhl break; 6556d180253SJesper Juhl } 6566708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n", 657c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name); 658c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH; 659c66ac9dbSNicholas Bellinger break; 660c66ac9dbSNicholas Bellinger case Opt_fd_dev_size: 661c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]); 6626d180253SJesper Juhl if (!arg_p) { 6636d180253SJesper Juhl ret = -ENOMEM; 6646d180253SJesper Juhl break; 6656d180253SJesper Juhl } 66657103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 6676d180253SJesper Juhl kfree(arg_p); 668c66ac9dbSNicholas Bellinger if (ret < 0) { 66957103d7fSJingoo Han pr_err("kstrtoull() failed for" 670c66ac9dbSNicholas Bellinger " fd_dev_size=\n"); 671c66ac9dbSNicholas Bellinger goto out; 672c66ac9dbSNicholas Bellinger } 6736708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu" 674c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size); 675c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE; 676c66ac9dbSNicholas Bellinger break; 677b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io: 678ce31c1b0SJoern Engel ret = match_int(args, &arg); 679ce31c1b0SJoern Engel if (ret) 680ce31c1b0SJoern Engel goto out; 681b32f4c7eSNicholas Bellinger if (arg != 1) { 682b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg); 683b32f4c7eSNicholas Bellinger ret = -EINVAL; 684b32f4c7eSNicholas Bellinger goto out; 685b32f4c7eSNicholas Bellinger } 686b32f4c7eSNicholas Bellinger 687b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O" 688b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n"); 689b32f4c7eSNicholas Bellinger 690b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 691b32f4c7eSNicholas Bellinger break; 692c66ac9dbSNicholas Bellinger default: 693c66ac9dbSNicholas Bellinger break; 694c66ac9dbSNicholas Bellinger } 695c66ac9dbSNicholas Bellinger } 696c66ac9dbSNicholas Bellinger 697c66ac9dbSNicholas Bellinger out: 698c66ac9dbSNicholas Bellinger kfree(orig); 699c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 700c66ac9dbSNicholas Bellinger } 701c66ac9dbSNicholas Bellinger 7020fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 703c66ac9dbSNicholas Bellinger { 7040fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 705c66ac9dbSNicholas Bellinger ssize_t bl = 0; 706c66ac9dbSNicholas Bellinger 707c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 708b32f4c7eSNicholas Bellinger bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 709b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size, 710b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 711b32f4c7eSNicholas Bellinger "Buffered-WCE" : "O_DSYNC"); 712c66ac9dbSNicholas Bellinger return bl; 713c66ac9dbSNicholas Bellinger } 714c66ac9dbSNicholas Bellinger 715c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev) 716c66ac9dbSNicholas Bellinger { 7170fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev); 718cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file; 719cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host; 720cd9323fdSNicholas Bellinger unsigned long long dev_size; 721cd9323fdSNicholas Bellinger /* 722cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device, 723cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order 724cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations. 725cd9323fdSNicholas Bellinger */ 726cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode)) 72721363ca8SNicholas Bellinger dev_size = i_size_read(i); 728cd9323fdSNicholas Bellinger else 729cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size; 730c66ac9dbSNicholas Bellinger 73121363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size, 73221363ca8SNicholas Bellinger dev->dev_attrib.block_size); 733c66ac9dbSNicholas Bellinger } 734c66ac9dbSNicholas Bellinger 7350f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev) 7360f5e2ec4SNicholas Bellinger { 7370f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 7380f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file; 7390f5e2ec4SNicholas Bellinger struct inode *inode; 7400f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 7410f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME]; 7420f5e2ec4SNicholas Bellinger 7430f5e2ec4SNicholas Bellinger if (!file) { 7440f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n"); 7450f5e2ec4SNicholas Bellinger return -ENODEV; 7460f5e2ec4SNicholas Bellinger } 7470f5e2ec4SNicholas Bellinger 7480f5e2ec4SNicholas Bellinger inode = file->f_mapping->host; 7490f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) { 7500f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on" 7510f5e2ec4SNicholas Bellinger " !S_ISBLK\n"); 7520f5e2ec4SNicholas Bellinger return -ENOSYS; 7530f5e2ec4SNicholas Bellinger } 7540f5e2ec4SNicholas Bellinger 7550f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 7560f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC; 7570f5e2ec4SNicholas Bellinger 7580f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 7590f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name); 7600f5e2ec4SNicholas Bellinger 7610f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600); 7620f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) { 7630f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf); 7640f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file); 7650f5e2ec4SNicholas Bellinger return ret; 7660f5e2ec4SNicholas Bellinger } 7670f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file; 7680f5e2ec4SNicholas Bellinger 7690f5e2ec4SNicholas Bellinger return 0; 7700f5e2ec4SNicholas Bellinger } 7710f5e2ec4SNicholas Bellinger 7720f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev) 7730f5e2ec4SNicholas Bellinger { 7740f5e2ec4SNicholas Bellinger unsigned char *buf; 7750f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 77664d240b7SAkinobu Mita int ret; 7770f5e2ec4SNicholas Bellinger 7780f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) { 7790f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n"); 7800f5e2ec4SNicholas Bellinger return -ENODEV; 7810f5e2ec4SNicholas Bellinger } 7820f5e2ec4SNicholas Bellinger 7830f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size); 7840f5e2ec4SNicholas Bellinger if (!buf) { 7850f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n"); 7860f5e2ec4SNicholas Bellinger return -ENOMEM; 7870f5e2ec4SNicholas Bellinger } 7880f5e2ec4SNicholas Bellinger 7890f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n", 79064d240b7SAkinobu Mita (unsigned long long)(dev->transport->get_blocks(dev) + 1) * 79164d240b7SAkinobu Mita dev->prot_length); 7920f5e2ec4SNicholas Bellinger 79380dcd0c1SSagi Grimberg memset(buf, 0xff, unit_size); 79464d240b7SAkinobu Mita ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, 79564d240b7SAkinobu Mita buf, unit_size); 7960f5e2ec4SNicholas Bellinger vfree(buf); 7970f5e2ec4SNicholas Bellinger return ret; 7980f5e2ec4SNicholas Bellinger } 7990f5e2ec4SNicholas Bellinger 8000f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev) 8010f5e2ec4SNicholas Bellinger { 8020f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev); 8030f5e2ec4SNicholas Bellinger 8040f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file) 8050f5e2ec4SNicholas Bellinger return; 8060f5e2ec4SNicholas Bellinger 8070f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL); 8080f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL; 8090f5e2ec4SNicholas Bellinger } 8100f5e2ec4SNicholas Bellinger 8119e999a6cSChristoph Hellwig static struct sbc_ops fd_sbc_ops = { 8120c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw, 813ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache, 8147b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same, 81550642762SAsias He .execute_unmap = fd_execute_unmap, 8160c2ad7d1SChristoph Hellwig }; 8170c2ad7d1SChristoph Hellwig 818de103c93SChristoph Hellwig static sense_reason_t 819de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd) 8200c2ad7d1SChristoph Hellwig { 8219e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &fd_sbc_ops); 8220c2ad7d1SChristoph Hellwig } 8230c2ad7d1SChristoph Hellwig 8240a06d430SChristoph Hellwig static const struct target_backend_ops fileio_ops = { 825c66ac9dbSNicholas Bellinger .name = "fileio", 8260fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO", 8270fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION, 828c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 829c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba, 830c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba, 8310fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device, 8320fd97ccfSChristoph Hellwig .configure_device = fd_configure_device, 83392634706SMike Christie .destroy_device = fd_destroy_device, 834c66ac9dbSNicholas Bellinger .free_device = fd_free_device, 8350c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb, 836c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params, 837c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params, 8386f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 839c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks, 8400f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot, 8410f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot, 8420f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot, 8435873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 844c66ac9dbSNicholas Bellinger }; 845c66ac9dbSNicholas Bellinger 846c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void) 847c66ac9dbSNicholas Bellinger { 8480a06d430SChristoph Hellwig return transport_backend_register(&fileio_ops); 849c66ac9dbSNicholas Bellinger } 850c66ac9dbSNicholas Bellinger 85163b91d5aSAsias He static void __exit fileio_module_exit(void) 852c66ac9dbSNicholas Bellinger { 8530a06d430SChristoph Hellwig target_backend_unregister(&fileio_ops); 854c66ac9dbSNicholas Bellinger } 855c66ac9dbSNicholas Bellinger 856c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 857c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 858c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 859c66ac9dbSNicholas Bellinger 860c66ac9dbSNicholas Bellinger module_init(fileio_module_init); 861c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit); 862