linux/drivers/target/target_core_file.c
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   1/*******************************************************************************
   2 * Filename:  target_core_file.c
   3 *
   4 * This file contains the Storage Engine <-> FILEIO transport specific functions
   5 *
   6 * Copyright (c) 2005 PyX Technologies, Inc.
   7 * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   8 * Copyright (c) 2007-2010 Rising Tide Systems
   9 * Copyright (c) 2008-2010 Linux-iSCSI.org
  10 *
  11 * Nicholas A. Bellinger <nab@kernel.org>
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26 *
  27 ******************************************************************************/
  28
  29#include <linux/string.h>
  30#include <linux/parser.h>
  31#include <linux/timer.h>
  32#include <linux/blkdev.h>
  33#include <linux/slab.h>
  34#include <linux/spinlock.h>
  35#include <linux/module.h>
  36#include <scsi/scsi.h>
  37#include <scsi/scsi_host.h>
  38
  39#include <target/target_core_base.h>
  40#include <target/target_core_backend.h>
  41
  42#include "target_core_file.h"
  43
  44static struct se_subsystem_api fileio_template;
  45
  46/*      fd_attach_hba(): (Part of se_subsystem_api_t template)
  47 *
  48 *
  49 */
  50static int fd_attach_hba(struct se_hba *hba, u32 host_id)
  51{
  52        struct fd_host *fd_host;
  53
  54        fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
  55        if (!fd_host) {
  56                pr_err("Unable to allocate memory for struct fd_host\n");
  57                return -ENOMEM;
  58        }
  59
  60        fd_host->fd_host_id = host_id;
  61
  62        hba->hba_ptr = fd_host;
  63
  64        pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
  65                " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
  66                TARGET_CORE_MOD_VERSION);
  67        pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
  68                " MaxSectors: %u\n",
  69                hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS);
  70
  71        return 0;
  72}
  73
  74static void fd_detach_hba(struct se_hba *hba)
  75{
  76        struct fd_host *fd_host = hba->hba_ptr;
  77
  78        pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
  79                " Target Core\n", hba->hba_id, fd_host->fd_host_id);
  80
  81        kfree(fd_host);
  82        hba->hba_ptr = NULL;
  83}
  84
  85static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
  86{
  87        struct fd_dev *fd_dev;
  88        struct fd_host *fd_host = hba->hba_ptr;
  89
  90        fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
  91        if (!fd_dev) {
  92                pr_err("Unable to allocate memory for struct fd_dev\n");
  93                return NULL;
  94        }
  95
  96        fd_dev->fd_host = fd_host;
  97
  98        pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
  99
 100        return fd_dev;
 101}
 102
 103/*      fd_create_virtdevice(): (Part of se_subsystem_api_t template)
 104 *
 105 *
 106 */
 107static struct se_device *fd_create_virtdevice(
 108        struct se_hba *hba,
 109        struct se_subsystem_dev *se_dev,
 110        void *p)
 111{
 112        struct se_device *dev;
 113        struct se_dev_limits dev_limits;
 114        struct queue_limits *limits;
 115        struct fd_dev *fd_dev = p;
 116        struct fd_host *fd_host = hba->hba_ptr;
 117        struct file *file;
 118        struct inode *inode = NULL;
 119        int dev_flags = 0, flags, ret = -EINVAL;
 120
 121        memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 122
 123        /*
 124         * Use O_DSYNC by default instead of O_SYNC to forgo syncing
 125         * of pure timestamp updates.
 126         */
 127        flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
 128        /*
 129         * Optionally allow fd_buffered_io=1 to be enabled for people
 130         * who want use the fs buffer cache as an WriteCache mechanism.
 131         *
 132         * This means that in event of a hard failure, there is a risk
 133         * of silent data-loss if the SCSI client has *not* performed a
 134         * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
 135         * to write-out the entire device cache.
 136         */
 137        if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 138                pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
 139                flags &= ~O_DSYNC;
 140        }
 141
 142        file = filp_open(fd_dev->fd_dev_name, flags, 0600);
 143        if (IS_ERR(file)) {
 144                pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
 145                ret = PTR_ERR(file);
 146                goto fail;
 147        }
 148        fd_dev->fd_file = file;
 149        /*
 150         * If using a block backend with this struct file, we extract
 151         * fd_dev->fd_[block,dev]_size from struct block_device.
 152         *
 153         * Otherwise, we use the passed fd_size= from configfs
 154         */
 155        inode = file->f_mapping->host;
 156        if (S_ISBLK(inode->i_mode)) {
 157                struct request_queue *q;
 158                unsigned long long dev_size;
 159                /*
 160                 * Setup the local scope queue_limits from struct request_queue->limits
 161                 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 162                 */
 163                q = bdev_get_queue(inode->i_bdev);
 164                limits = &dev_limits.limits;
 165                limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
 166                limits->max_hw_sectors = queue_max_hw_sectors(q);
 167                limits->max_sectors = queue_max_sectors(q);
 168                /*
 169                 * Determine the number of bytes from i_size_read() minus
 170                 * one (1) logical sector from underlying struct block_device
 171                 */
 172                fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
 173                dev_size = (i_size_read(file->f_mapping->host) -
 174                                       fd_dev->fd_block_size);
 175
 176                pr_debug("FILEIO: Using size: %llu bytes from struct"
 177                        " block_device blocks: %llu logical_block_size: %d\n",
 178                        dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 179                        fd_dev->fd_block_size);
 180        } else {
 181                if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
 182                        pr_err("FILEIO: Missing fd_dev_size="
 183                                " parameter, and no backing struct"
 184                                " block_device\n");
 185                        goto fail;
 186                }
 187
 188                limits = &dev_limits.limits;
 189                limits->logical_block_size = FD_BLOCKSIZE;
 190                limits->max_hw_sectors = FD_MAX_SECTORS;
 191                limits->max_sectors = FD_MAX_SECTORS;
 192                fd_dev->fd_block_size = FD_BLOCKSIZE;
 193        }
 194
 195        dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
 196        dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
 197
 198        dev = transport_add_device_to_core_hba(hba, &fileio_template,
 199                                se_dev, dev_flags, fd_dev,
 200                                &dev_limits, "FILEIO", FD_VERSION);
 201        if (!dev)
 202                goto fail;
 203
 204        if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 205                pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
 206                        " with FDBD_HAS_BUFFERED_IO_WCE\n");
 207                dev->se_sub_dev->se_dev_attrib.emulate_write_cache = 1;
 208        }
 209
 210        fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
 211        fd_dev->fd_queue_depth = dev->queue_depth;
 212
 213        pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
 214                " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
 215                        fd_dev->fd_dev_name, fd_dev->fd_dev_size);
 216
 217        return dev;
 218fail:
 219        if (fd_dev->fd_file) {
 220                filp_close(fd_dev->fd_file, NULL);
 221                fd_dev->fd_file = NULL;
 222        }
 223        return ERR_PTR(ret);
 224}
 225
 226/*      fd_free_device(): (Part of se_subsystem_api_t template)
 227 *
 228 *
 229 */
 230static void fd_free_device(void *p)
 231{
 232        struct fd_dev *fd_dev = p;
 233
 234        if (fd_dev->fd_file) {
 235                filp_close(fd_dev->fd_file, NULL);
 236                fd_dev->fd_file = NULL;
 237        }
 238
 239        kfree(fd_dev);
 240}
 241
 242static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
 243                u32 sgl_nents)
 244{
 245        struct se_device *se_dev = cmd->se_dev;
 246        struct fd_dev *dev = se_dev->dev_ptr;
 247        struct file *fd = dev->fd_file;
 248        struct scatterlist *sg;
 249        struct iovec *iov;
 250        mm_segment_t old_fs;
 251        loff_t pos = (cmd->t_task_lba *
 252                      se_dev->se_sub_dev->se_dev_attrib.block_size);
 253        int ret = 0, i;
 254
 255        iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
 256        if (!iov) {
 257                pr_err("Unable to allocate fd_do_readv iov[]\n");
 258                return -ENOMEM;
 259        }
 260
 261        for_each_sg(sgl, sg, sgl_nents, i) {
 262                iov[i].iov_len = sg->length;
 263                iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
 264        }
 265
 266        old_fs = get_fs();
 267        set_fs(get_ds());
 268        ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
 269        set_fs(old_fs);
 270
 271        for_each_sg(sgl, sg, sgl_nents, i)
 272                kunmap(sg_page(sg));
 273        kfree(iov);
 274        /*
 275         * Return zeros and GOOD status even if the READ did not return
 276         * the expected virt_size for struct file w/o a backing struct
 277         * block_device.
 278         */
 279        if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
 280                if (ret < 0 || ret != cmd->data_length) {
 281                        pr_err("vfs_readv() returned %d,"
 282                                " expecting %d for S_ISBLK\n", ret,
 283                                (int)cmd->data_length);
 284                        return (ret < 0 ? ret : -EINVAL);
 285                }
 286        } else {
 287                if (ret < 0) {
 288                        pr_err("vfs_readv() returned %d for non"
 289                                " S_ISBLK\n", ret);
 290                        return ret;
 291                }
 292        }
 293
 294        return 1;
 295}
 296
 297static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl,
 298                u32 sgl_nents)
 299{
 300        struct se_device *se_dev = cmd->se_dev;
 301        struct fd_dev *dev = se_dev->dev_ptr;
 302        struct file *fd = dev->fd_file;
 303        struct scatterlist *sg;
 304        struct iovec *iov;
 305        mm_segment_t old_fs;
 306        loff_t pos = (cmd->t_task_lba *
 307                      se_dev->se_sub_dev->se_dev_attrib.block_size);
 308        int ret, i = 0;
 309
 310        iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
 311        if (!iov) {
 312                pr_err("Unable to allocate fd_do_writev iov[]\n");
 313                return -ENOMEM;
 314        }
 315
 316        for_each_sg(sgl, sg, sgl_nents, i) {
 317                iov[i].iov_len = sg->length;
 318                iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
 319        }
 320
 321        old_fs = get_fs();
 322        set_fs(get_ds());
 323        ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
 324        set_fs(old_fs);
 325
 326        for_each_sg(sgl, sg, sgl_nents, i)
 327                kunmap(sg_page(sg));
 328
 329        kfree(iov);
 330
 331        if (ret < 0 || ret != cmd->data_length) {
 332                pr_err("vfs_writev() returned %d\n", ret);
 333                return (ret < 0 ? ret : -EINVAL);
 334        }
 335
 336        return 1;
 337}
 338
 339static int fd_execute_sync_cache(struct se_cmd *cmd)
 340{
 341        struct se_device *dev = cmd->se_dev;
 342        struct fd_dev *fd_dev = dev->dev_ptr;
 343        int immed = (cmd->t_task_cdb[1] & 0x2);
 344        loff_t start, end;
 345        int ret;
 346
 347        /*
 348         * If the Immediate bit is set, queue up the GOOD response
 349         * for this SYNCHRONIZE_CACHE op
 350         */
 351        if (immed)
 352                target_complete_cmd(cmd, SAM_STAT_GOOD);
 353
 354        /*
 355         * Determine if we will be flushing the entire device.
 356         */
 357        if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
 358                start = 0;
 359                end = LLONG_MAX;
 360        } else {
 361                start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 362                if (cmd->data_length)
 363                        end = start + cmd->data_length;
 364                else
 365                        end = LLONG_MAX;
 366        }
 367
 368        ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 369        if (ret != 0)
 370                pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 371
 372        if (immed)
 373                return 0;
 374
 375        if (ret) {
 376                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 377                target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
 378        } else {
 379                target_complete_cmd(cmd, SAM_STAT_GOOD);
 380        }
 381
 382        return 0;
 383}
 384
 385static int fd_execute_rw(struct se_cmd *cmd)
 386{
 387        struct scatterlist *sgl = cmd->t_data_sg;
 388        u32 sgl_nents = cmd->t_data_nents;
 389        enum dma_data_direction data_direction = cmd->data_direction;
 390        struct se_device *dev = cmd->se_dev;
 391        int ret = 0;
 392
 393        /*
 394         * Call vectorized fileio functions to map struct scatterlist
 395         * physical memory addresses to struct iovec virtual memory.
 396         */
 397        if (data_direction == DMA_FROM_DEVICE) {
 398                ret = fd_do_readv(cmd, sgl, sgl_nents);
 399        } else {
 400                ret = fd_do_writev(cmd, sgl, sgl_nents);
 401                /*
 402                 * Perform implict vfs_fsync_range() for fd_do_writev() ops
 403                 * for SCSI WRITEs with Forced Unit Access (FUA) set.
 404                 * Allow this to happen independent of WCE=0 setting.
 405                 */
 406                if (ret > 0 &&
 407                    dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
 408                    (cmd->se_cmd_flags & SCF_FUA)) {
 409                        struct fd_dev *fd_dev = dev->dev_ptr;
 410                        loff_t start = cmd->t_task_lba *
 411                                dev->se_sub_dev->se_dev_attrib.block_size;
 412                        loff_t end = start + cmd->data_length;
 413
 414                        vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 415                }
 416        }
 417
 418        if (ret < 0) {
 419                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 420                return ret;
 421        }
 422        if (ret)
 423                target_complete_cmd(cmd, SAM_STAT_GOOD);
 424        return 0;
 425}
 426
 427enum {
 428        Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
 429};
 430
 431static match_table_t tokens = {
 432        {Opt_fd_dev_name, "fd_dev_name=%s"},
 433        {Opt_fd_dev_size, "fd_dev_size=%s"},
 434        {Opt_fd_buffered_io, "fd_buffered_io=%d"},
 435        {Opt_err, NULL}
 436};
 437
 438static ssize_t fd_set_configfs_dev_params(
 439        struct se_hba *hba,
 440        struct se_subsystem_dev *se_dev,
 441        const char *page, ssize_t count)
 442{
 443        struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 444        char *orig, *ptr, *arg_p, *opts;
 445        substring_t args[MAX_OPT_ARGS];
 446        int ret = 0, arg, token;
 447
 448        opts = kstrdup(page, GFP_KERNEL);
 449        if (!opts)
 450                return -ENOMEM;
 451
 452        orig = opts;
 453
 454        while ((ptr = strsep(&opts, ",\n")) != NULL) {
 455                if (!*ptr)
 456                        continue;
 457
 458                token = match_token(ptr, tokens, args);
 459                switch (token) {
 460                case Opt_fd_dev_name:
 461                        if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
 462                                FD_MAX_DEV_NAME) == 0) {
 463                                ret = -EINVAL;
 464                                break;
 465                        }
 466                        pr_debug("FILEIO: Referencing Path: %s\n",
 467                                        fd_dev->fd_dev_name);
 468                        fd_dev->fbd_flags |= FBDF_HAS_PATH;
 469                        break;
 470                case Opt_fd_dev_size:
 471                        arg_p = match_strdup(&args[0]);
 472                        if (!arg_p) {
 473                                ret = -ENOMEM;
 474                                break;
 475                        }
 476                        ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
 477                        kfree(arg_p);
 478                        if (ret < 0) {
 479                                pr_err("strict_strtoull() failed for"
 480                                                " fd_dev_size=\n");
 481                                goto out;
 482                        }
 483                        pr_debug("FILEIO: Referencing Size: %llu"
 484                                        " bytes\n", fd_dev->fd_dev_size);
 485                        fd_dev->fbd_flags |= FBDF_HAS_SIZE;
 486                        break;
 487                case Opt_fd_buffered_io:
 488                        match_int(args, &arg);
 489                        if (arg != 1) {
 490                                pr_err("bogus fd_buffered_io=%d value\n", arg);
 491                                ret = -EINVAL;
 492                                goto out;
 493                        }
 494
 495                        pr_debug("FILEIO: Using buffered I/O"
 496                                " operations for struct fd_dev\n");
 497
 498                        fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
 499                        break;
 500                default:
 501                        break;
 502                }
 503        }
 504
 505out:
 506        kfree(orig);
 507        return (!ret) ? count : ret;
 508}
 509
 510static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
 511{
 512        struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 513
 514        if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
 515                pr_err("Missing fd_dev_name=\n");
 516                return -EINVAL;
 517        }
 518
 519        return 0;
 520}
 521
 522static ssize_t fd_show_configfs_dev_params(
 523        struct se_hba *hba,
 524        struct se_subsystem_dev *se_dev,
 525        char *b)
 526{
 527        struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 528        ssize_t bl = 0;
 529
 530        bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
 531        bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
 532                fd_dev->fd_dev_name, fd_dev->fd_dev_size,
 533                (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
 534                "Buffered-WCE" : "O_DSYNC");
 535        return bl;
 536}
 537
 538/*      fd_get_device_rev(): (Part of se_subsystem_api_t template)
 539 *
 540 *
 541 */
 542static u32 fd_get_device_rev(struct se_device *dev)
 543{
 544        return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
 545}
 546
 547/*      fd_get_device_type(): (Part of se_subsystem_api_t template)
 548 *
 549 *
 550 */
 551static u32 fd_get_device_type(struct se_device *dev)
 552{
 553        return TYPE_DISK;
 554}
 555
 556static sector_t fd_get_blocks(struct se_device *dev)
 557{
 558        struct fd_dev *fd_dev = dev->dev_ptr;
 559        struct file *f = fd_dev->fd_file;
 560        struct inode *i = f->f_mapping->host;
 561        unsigned long long dev_size;
 562        /*
 563         * When using a file that references an underlying struct block_device,
 564         * ensure dev_size is always based on the current inode size in order
 565         * to handle underlying block_device resize operations.
 566         */
 567        if (S_ISBLK(i->i_mode))
 568                dev_size = (i_size_read(i) - fd_dev->fd_block_size);
 569        else
 570                dev_size = fd_dev->fd_dev_size;
 571
 572        return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size);
 573}
 574
 575static struct spc_ops fd_spc_ops = {
 576        .execute_rw             = fd_execute_rw,
 577        .execute_sync_cache     = fd_execute_sync_cache,
 578};
 579
 580static int fd_parse_cdb(struct se_cmd *cmd)
 581{
 582        return sbc_parse_cdb(cmd, &fd_spc_ops);
 583}
 584
 585static struct se_subsystem_api fileio_template = {
 586        .name                   = "fileio",
 587        .owner                  = THIS_MODULE,
 588        .transport_type         = TRANSPORT_PLUGIN_VHBA_PDEV,
 589        .attach_hba             = fd_attach_hba,
 590        .detach_hba             = fd_detach_hba,
 591        .allocate_virtdevice    = fd_allocate_virtdevice,
 592        .create_virtdevice      = fd_create_virtdevice,
 593        .free_device            = fd_free_device,
 594        .parse_cdb              = fd_parse_cdb,
 595        .check_configfs_dev_params = fd_check_configfs_dev_params,
 596        .set_configfs_dev_params = fd_set_configfs_dev_params,
 597        .show_configfs_dev_params = fd_show_configfs_dev_params,
 598        .get_device_rev         = fd_get_device_rev,
 599        .get_device_type        = fd_get_device_type,
 600        .get_blocks             = fd_get_blocks,
 601};
 602
 603static int __init fileio_module_init(void)
 604{
 605        return transport_subsystem_register(&fileio_template);
 606}
 607
 608static void fileio_module_exit(void)
 609{
 610        transport_subsystem_release(&fileio_template);
 611}
 612
 613MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
 614MODULE_AUTHOR("nab@Linux-iSCSI.org");
 615MODULE_LICENSE("GPL");
 616
 617module_init(fileio_module_init);
 618module_exit(fileio_module_exit);
 619
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