linux/fs/hppfs/hppfs.c
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   1/*
   2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#include <linux/ctype.h>
   7#include <linux/dcache.h>
   8#include <linux/file.h>
   9#include <linux/fs.h>
  10#include <linux/init.h>
  11#include <linux/kernel.h>
  12#include <linux/list.h>
  13#include <linux/module.h>
  14#include <linux/mount.h>
  15#include <linux/slab.h>
  16#include <linux/statfs.h>
  17#include <linux/types.h>
  18#include <linux/pid_namespace.h>
  19#include <linux/namei.h>
  20#include <asm/uaccess.h>
  21#include <os.h>
  22
  23static struct inode *get_inode(struct super_block *, struct dentry *);
  24
  25struct hppfs_data {
  26        struct list_head list;
  27        char contents[PAGE_SIZE - sizeof(struct list_head)];
  28};
  29
  30struct hppfs_private {
  31        struct file *proc_file;
  32        int host_fd;
  33        loff_t len;
  34        struct hppfs_data *contents;
  35};
  36
  37struct hppfs_inode_info {
  38        struct dentry *proc_dentry;
  39        struct inode vfs_inode;
  40};
  41
  42static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
  43{
  44        return container_of(inode, struct hppfs_inode_info, vfs_inode);
  45}
  46
  47#define HPPFS_SUPER_MAGIC 0xb00000ee
  48
  49static const struct super_operations hppfs_sbops;
  50
  51static int is_pid(struct dentry *dentry)
  52{
  53        struct super_block *sb;
  54        int i;
  55
  56        sb = dentry->d_sb;
  57        if (dentry->d_parent != sb->s_root)
  58                return 0;
  59
  60        for (i = 0; i < dentry->d_name.len; i++) {
  61                if (!isdigit(dentry->d_name.name[i]))
  62                        return 0;
  63        }
  64        return 1;
  65}
  66
  67static char *dentry_name(struct dentry *dentry, int extra)
  68{
  69        struct dentry *parent;
  70        char *root, *name;
  71        const char *seg_name;
  72        int len, seg_len;
  73
  74        len = 0;
  75        parent = dentry;
  76        while (parent->d_parent != parent) {
  77                if (is_pid(parent))
  78                        len += strlen("pid") + 1;
  79                else len += parent->d_name.len + 1;
  80                parent = parent->d_parent;
  81        }
  82
  83        root = "proc";
  84        len += strlen(root);
  85        name = kmalloc(len + extra + 1, GFP_KERNEL);
  86        if (name == NULL)
  87                return NULL;
  88
  89        name[len] = '\0';
  90        parent = dentry;
  91        while (parent->d_parent != parent) {
  92                if (is_pid(parent)) {
  93                        seg_name = "pid";
  94                        seg_len = strlen("pid");
  95                }
  96                else {
  97                        seg_name = parent->d_name.name;
  98                        seg_len = parent->d_name.len;
  99                }
 100
 101                len -= seg_len + 1;
 102                name[len] = '/';
 103                strncpy(&name[len + 1], seg_name, seg_len);
 104                parent = parent->d_parent;
 105        }
 106        strncpy(name, root, strlen(root));
 107        return name;
 108}
 109
 110static int file_removed(struct dentry *dentry, const char *file)
 111{
 112        char *host_file;
 113        int extra, fd;
 114
 115        extra = 0;
 116        if (file != NULL)
 117                extra += strlen(file) + 1;
 118
 119        host_file = dentry_name(dentry, extra + strlen("/remove"));
 120        if (host_file == NULL) {
 121                printk(KERN_ERR "file_removed : allocation failed\n");
 122                return -ENOMEM;
 123        }
 124
 125        if (file != NULL) {
 126                strcat(host_file, "/");
 127                strcat(host_file, file);
 128        }
 129        strcat(host_file, "/remove");
 130
 131        fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
 132        kfree(host_file);
 133        if (fd > 0) {
 134                os_close_file(fd);
 135                return 1;
 136        }
 137        return 0;
 138}
 139
 140static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
 141                                   unsigned int flags)
 142{
 143        struct dentry *proc_dentry, *parent;
 144        struct qstr *name = &dentry->d_name;
 145        struct inode *inode;
 146        int err, deleted;
 147
 148        deleted = file_removed(dentry, NULL);
 149        if (deleted < 0)
 150                return ERR_PTR(deleted);
 151        else if (deleted)
 152                return ERR_PTR(-ENOENT);
 153
 154        parent = HPPFS_I(ino)->proc_dentry;
 155        mutex_lock(&parent->d_inode->i_mutex);
 156        proc_dentry = lookup_one_len(name->name, parent, name->len);
 157        mutex_unlock(&parent->d_inode->i_mutex);
 158
 159        if (IS_ERR(proc_dentry))
 160                return proc_dentry;
 161
 162        err = -ENOMEM;
 163        inode = get_inode(ino->i_sb, proc_dentry);
 164        if (!inode)
 165                goto out;
 166
 167        d_add(dentry, inode);
 168        return NULL;
 169
 170 out:
 171        return ERR_PTR(err);
 172}
 173
 174static const struct inode_operations hppfs_file_iops = {
 175};
 176
 177static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
 178                         loff_t *ppos, int is_user)
 179{
 180        ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
 181        ssize_t n;
 182
 183        read = file->f_path.dentry->d_inode->i_fop->read;
 184
 185        if (!is_user)
 186                set_fs(KERNEL_DS);
 187
 188        n = (*read)(file, buf, count, &file->f_pos);
 189
 190        if (!is_user)
 191                set_fs(USER_DS);
 192
 193        if (ppos)
 194                *ppos = file->f_pos;
 195        return n;
 196}
 197
 198static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
 199{
 200        ssize_t n;
 201        int cur, err;
 202        char *new_buf;
 203
 204        n = -ENOMEM;
 205        new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 206        if (new_buf == NULL) {
 207                printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
 208                goto out;
 209        }
 210        n = 0;
 211        while (count > 0) {
 212                cur = min_t(ssize_t, count, PAGE_SIZE);
 213                err = os_read_file(fd, new_buf, cur);
 214                if (err < 0) {
 215                        printk(KERN_ERR "hppfs_read : read failed, "
 216                               "errno = %d\n", err);
 217                        n = err;
 218                        goto out_free;
 219                } else if (err == 0)
 220                        break;
 221
 222                if (copy_to_user(buf, new_buf, err)) {
 223                        n = -EFAULT;
 224                        goto out_free;
 225                }
 226                n += err;
 227                count -= err;
 228        }
 229 out_free:
 230        kfree(new_buf);
 231 out:
 232        return n;
 233}
 234
 235static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
 236                          loff_t *ppos)
 237{
 238        struct hppfs_private *hppfs = file->private_data;
 239        struct hppfs_data *data;
 240        loff_t off;
 241        int err;
 242
 243        if (hppfs->contents != NULL) {
 244                int rem;
 245
 246                if (*ppos >= hppfs->len)
 247                        return 0;
 248
 249                data = hppfs->contents;
 250                off = *ppos;
 251                while (off >= sizeof(data->contents)) {
 252                        data = list_entry(data->list.next, struct hppfs_data,
 253                                          list);
 254                        off -= sizeof(data->contents);
 255                }
 256
 257                if (off + count > hppfs->len)
 258                        count = hppfs->len - off;
 259                rem = copy_to_user(buf, &data->contents[off], count);
 260                *ppos += count - rem;
 261                if (rem > 0)
 262                        return -EFAULT;
 263        } else if (hppfs->host_fd != -1) {
 264                err = os_seek_file(hppfs->host_fd, *ppos);
 265                if (err) {
 266                        printk(KERN_ERR "hppfs_read : seek failed, "
 267                               "errno = %d\n", err);
 268                        return err;
 269                }
 270                err = hppfs_read_file(hppfs->host_fd, buf, count);
 271                if (err < 0) {
 272                        printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
 273                        return err;
 274                }
 275                count = err;
 276                if (count > 0)
 277                        *ppos += count;
 278        }
 279        else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
 280
 281        return count;
 282}
 283
 284static ssize_t hppfs_write(struct file *file, const char __user *buf,
 285                           size_t len, loff_t *ppos)
 286{
 287        struct hppfs_private *data = file->private_data;
 288        struct file *proc_file = data->proc_file;
 289        ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
 290
 291        write = proc_file->f_path.dentry->d_inode->i_fop->write;
 292        return (*write)(proc_file, buf, len, ppos);
 293}
 294
 295static int open_host_sock(char *host_file, int *filter_out)
 296{
 297        char *end;
 298        int fd;
 299
 300        end = &host_file[strlen(host_file)];
 301        strcpy(end, "/rw");
 302        *filter_out = 1;
 303        fd = os_connect_socket(host_file);
 304        if (fd > 0)
 305                return fd;
 306
 307        strcpy(end, "/r");
 308        *filter_out = 0;
 309        fd = os_connect_socket(host_file);
 310        return fd;
 311}
 312
 313static void free_contents(struct hppfs_data *head)
 314{
 315        struct hppfs_data *data;
 316        struct list_head *ele, *next;
 317
 318        if (head == NULL)
 319                return;
 320
 321        list_for_each_safe(ele, next, &head->list) {
 322                data = list_entry(ele, struct hppfs_data, list);
 323                kfree(data);
 324        }
 325        kfree(head);
 326}
 327
 328static struct hppfs_data *hppfs_get_data(int fd, int filter,
 329                                         struct file *proc_file,
 330                                         struct file *hppfs_file,
 331                                         loff_t *size_out)
 332{
 333        struct hppfs_data *data, *new, *head;
 334        int n, err;
 335
 336        err = -ENOMEM;
 337        data = kmalloc(sizeof(*data), GFP_KERNEL);
 338        if (data == NULL) {
 339                printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
 340                goto failed;
 341        }
 342
 343        INIT_LIST_HEAD(&data->list);
 344
 345        head = data;
 346        *size_out = 0;
 347
 348        if (filter) {
 349                while ((n = read_proc(proc_file, data->contents,
 350                                      sizeof(data->contents), NULL, 0)) > 0)
 351                        os_write_file(fd, data->contents, n);
 352                err = os_shutdown_socket(fd, 0, 1);
 353                if (err) {
 354                        printk(KERN_ERR "hppfs_get_data : failed to shut down "
 355                               "socket\n");
 356                        goto failed_free;
 357                }
 358        }
 359        while (1) {
 360                n = os_read_file(fd, data->contents, sizeof(data->contents));
 361                if (n < 0) {
 362                        err = n;
 363                        printk(KERN_ERR "hppfs_get_data : read failed, "
 364                               "errno = %d\n", err);
 365                        goto failed_free;
 366                } else if (n == 0)
 367                        break;
 368
 369                *size_out += n;
 370
 371                if (n < sizeof(data->contents))
 372                        break;
 373
 374                new = kmalloc(sizeof(*data), GFP_KERNEL);
 375                if (new == 0) {
 376                        printk(KERN_ERR "hppfs_get_data : data allocation "
 377                               "failed\n");
 378                        err = -ENOMEM;
 379                        goto failed_free;
 380                }
 381
 382                INIT_LIST_HEAD(&new->list);
 383                list_add(&new->list, &data->list);
 384                data = new;
 385        }
 386        return head;
 387
 388 failed_free:
 389        free_contents(head);
 390 failed:
 391        return ERR_PTR(err);
 392}
 393
 394static struct hppfs_private *hppfs_data(void)
 395{
 396        struct hppfs_private *data;
 397
 398        data = kmalloc(sizeof(*data), GFP_KERNEL);
 399        if (data == NULL)
 400                return data;
 401
 402        *data = ((struct hppfs_private ) { .host_fd             = -1,
 403                                           .len                 = -1,
 404                                           .contents            = NULL } );
 405        return data;
 406}
 407
 408static int file_mode(int fmode)
 409{
 410        if (fmode == (FMODE_READ | FMODE_WRITE))
 411                return O_RDWR;
 412        if (fmode == FMODE_READ)
 413                return O_RDONLY;
 414        if (fmode == FMODE_WRITE)
 415                return O_WRONLY;
 416        return 0;
 417}
 418
 419static int hppfs_open(struct inode *inode, struct file *file)
 420{
 421        const struct cred *cred = file->f_cred;
 422        struct hppfs_private *data;
 423        struct path path;
 424        char *host_file;
 425        int err, fd, type, filter;
 426
 427        err = -ENOMEM;
 428        data = hppfs_data();
 429        if (data == NULL)
 430                goto out;
 431
 432        host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
 433        if (host_file == NULL)
 434                goto out_free2;
 435
 436        path.mnt = inode->i_sb->s_fs_info;
 437        path.dentry = HPPFS_I(inode)->proc_dentry;
 438
 439        /* XXX This isn't closed anywhere */
 440        data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred);
 441        err = PTR_ERR(data->proc_file);
 442        if (IS_ERR(data->proc_file))
 443                goto out_free1;
 444
 445        type = os_file_type(host_file);
 446        if (type == OS_TYPE_FILE) {
 447                fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
 448                if (fd >= 0)
 449                        data->host_fd = fd;
 450                else
 451                        printk(KERN_ERR "hppfs_open : failed to open '%s', "
 452                               "errno = %d\n", host_file, -fd);
 453
 454                data->contents = NULL;
 455        } else if (type == OS_TYPE_DIR) {
 456                fd = open_host_sock(host_file, &filter);
 457                if (fd > 0) {
 458                        data->contents = hppfs_get_data(fd, filter,
 459                                                        data->proc_file,
 460                                                        file, &data->len);
 461                        if (!IS_ERR(data->contents))
 462                                data->host_fd = fd;
 463                } else
 464                        printk(KERN_ERR "hppfs_open : failed to open a socket "
 465                               "in '%s', errno = %d\n", host_file, -fd);
 466        }
 467        kfree(host_file);
 468
 469        file->private_data = data;
 470        return 0;
 471
 472 out_free1:
 473        kfree(host_file);
 474 out_free2:
 475        free_contents(data->contents);
 476        kfree(data);
 477 out:
 478        return err;
 479}
 480
 481static int hppfs_dir_open(struct inode *inode, struct file *file)
 482{
 483        const struct cred *cred = file->f_cred;
 484        struct hppfs_private *data;
 485        struct path path;
 486        int err;
 487
 488        err = -ENOMEM;
 489        data = hppfs_data();
 490        if (data == NULL)
 491                goto out;
 492
 493        path.mnt = inode->i_sb->s_fs_info;
 494        path.dentry = HPPFS_I(inode)->proc_dentry;
 495        data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred);
 496        err = PTR_ERR(data->proc_file);
 497        if (IS_ERR(data->proc_file))
 498                goto out_free;
 499
 500        file->private_data = data;
 501        return 0;
 502
 503 out_free:
 504        kfree(data);
 505 out:
 506        return err;
 507}
 508
 509static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
 510{
 511        struct hppfs_private *data = file->private_data;
 512        struct file *proc_file = data->proc_file;
 513        loff_t (*llseek)(struct file *, loff_t, int);
 514        loff_t ret;
 515
 516        llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
 517        if (llseek != NULL) {
 518                ret = (*llseek)(proc_file, off, where);
 519                if (ret < 0)
 520                        return ret;
 521        }
 522
 523        return default_llseek(file, off, where);
 524}
 525
 526static const struct file_operations hppfs_file_fops = {
 527        .owner          = NULL,
 528        .llseek         = hppfs_llseek,
 529        .read           = hppfs_read,
 530        .write          = hppfs_write,
 531        .open           = hppfs_open,
 532};
 533
 534struct hppfs_dirent {
 535        void *vfs_dirent;
 536        filldir_t filldir;
 537        struct dentry *dentry;
 538};
 539
 540static int hppfs_filldir(void *d, const char *name, int size,
 541                         loff_t offset, u64 inode, unsigned int type)
 542{
 543        struct hppfs_dirent *dirent = d;
 544
 545        if (file_removed(dirent->dentry, name))
 546                return 0;
 547
 548        return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
 549                                  inode, type);
 550}
 551
 552static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
 553{
 554        struct hppfs_private *data = file->private_data;
 555        struct file *proc_file = data->proc_file;
 556        int (*readdir)(struct file *, void *, filldir_t);
 557        struct hppfs_dirent dirent = ((struct hppfs_dirent)
 558                                      { .vfs_dirent     = ent,
 559                                        .filldir        = filldir,
 560                                        .dentry         = file->f_path.dentry
 561                                      });
 562        int err;
 563
 564        readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
 565
 566        proc_file->f_pos = file->f_pos;
 567        err = (*readdir)(proc_file, &dirent, hppfs_filldir);
 568        file->f_pos = proc_file->f_pos;
 569
 570        return err;
 571}
 572
 573static int hppfs_fsync(struct file *file, loff_t start, loff_t end,
 574                       int datasync)
 575{
 576        return filemap_write_and_wait_range(file->f_mapping, start, end);
 577}
 578
 579static const struct file_operations hppfs_dir_fops = {
 580        .owner          = NULL,
 581        .readdir        = hppfs_readdir,
 582        .open           = hppfs_dir_open,
 583        .fsync          = hppfs_fsync,
 584        .llseek         = default_llseek,
 585};
 586
 587static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
 588{
 589        sf->f_blocks = 0;
 590        sf->f_bfree = 0;
 591        sf->f_bavail = 0;
 592        sf->f_files = 0;
 593        sf->f_ffree = 0;
 594        sf->f_type = HPPFS_SUPER_MAGIC;
 595        return 0;
 596}
 597
 598static struct inode *hppfs_alloc_inode(struct super_block *sb)
 599{
 600        struct hppfs_inode_info *hi;
 601
 602        hi = kmalloc(sizeof(*hi), GFP_KERNEL);
 603        if (!hi)
 604                return NULL;
 605
 606        hi->proc_dentry = NULL;
 607        inode_init_once(&hi->vfs_inode);
 608        return &hi->vfs_inode;
 609}
 610
 611void hppfs_evict_inode(struct inode *ino)
 612{
 613        clear_inode(ino);
 614        dput(HPPFS_I(ino)->proc_dentry);
 615        mntput(ino->i_sb->s_fs_info);
 616}
 617
 618static void hppfs_i_callback(struct rcu_head *head)
 619{
 620        struct inode *inode = container_of(head, struct inode, i_rcu);
 621        kfree(HPPFS_I(inode));
 622}
 623
 624static void hppfs_destroy_inode(struct inode *inode)
 625{
 626        call_rcu(&inode->i_rcu, hppfs_i_callback);
 627}
 628
 629static const struct super_operations hppfs_sbops = {
 630        .alloc_inode    = hppfs_alloc_inode,
 631        .destroy_inode  = hppfs_destroy_inode,
 632        .evict_inode    = hppfs_evict_inode,
 633        .statfs         = hppfs_statfs,
 634};
 635
 636static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
 637                          int buflen)
 638{
 639        struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
 640        return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
 641                                                    buflen);
 642}
 643
 644static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 645{
 646        struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
 647
 648        return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
 649}
 650
 651static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
 652                           void *cookie)
 653{
 654        struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
 655
 656        if (proc_dentry->d_inode->i_op->put_link)
 657                proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
 658}
 659
 660static const struct inode_operations hppfs_dir_iops = {
 661        .lookup         = hppfs_lookup,
 662};
 663
 664static const struct inode_operations hppfs_link_iops = {
 665        .readlink       = hppfs_readlink,
 666        .follow_link    = hppfs_follow_link,
 667        .put_link       = hppfs_put_link,
 668};
 669
 670static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
 671{
 672        struct inode *proc_ino = dentry->d_inode;
 673        struct inode *inode = new_inode(sb);
 674
 675        if (!inode) {
 676                dput(dentry);
 677                return NULL;
 678        }
 679
 680        if (S_ISDIR(dentry->d_inode->i_mode)) {
 681                inode->i_op = &hppfs_dir_iops;
 682                inode->i_fop = &hppfs_dir_fops;
 683        } else if (S_ISLNK(dentry->d_inode->i_mode)) {
 684                inode->i_op = &hppfs_link_iops;
 685                inode->i_fop = &hppfs_file_fops;
 686        } else {
 687                inode->i_op = &hppfs_file_iops;
 688                inode->i_fop = &hppfs_file_fops;
 689        }
 690
 691        HPPFS_I(inode)->proc_dentry = dentry;
 692
 693        inode->i_uid = proc_ino->i_uid;
 694        inode->i_gid = proc_ino->i_gid;
 695        inode->i_atime = proc_ino->i_atime;
 696        inode->i_mtime = proc_ino->i_mtime;
 697        inode->i_ctime = proc_ino->i_ctime;
 698        inode->i_ino = proc_ino->i_ino;
 699        inode->i_mode = proc_ino->i_mode;
 700        set_nlink(inode, proc_ino->i_nlink);
 701        inode->i_size = proc_ino->i_size;
 702        inode->i_blocks = proc_ino->i_blocks;
 703
 704        return inode;
 705}
 706
 707static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
 708{
 709        struct inode *root_inode;
 710        struct vfsmount *proc_mnt;
 711        int err = -ENOENT;
 712
 713        proc_mnt = mntget(task_active_pid_ns(current)->proc_mnt);
 714        if (IS_ERR(proc_mnt))
 715                goto out;
 716
 717        sb->s_blocksize = 1024;
 718        sb->s_blocksize_bits = 10;
 719        sb->s_magic = HPPFS_SUPER_MAGIC;
 720        sb->s_op = &hppfs_sbops;
 721        sb->s_fs_info = proc_mnt;
 722
 723        err = -ENOMEM;
 724        root_inode = get_inode(sb, dget(proc_mnt->mnt_root));
 725        sb->s_root = d_make_root(root_inode);
 726        if (!sb->s_root)
 727                goto out_mntput;
 728
 729        return 0;
 730
 731 out_mntput:
 732        mntput(proc_mnt);
 733 out:
 734        return(err);
 735}
 736
 737static struct dentry *hppfs_read_super(struct file_system_type *type,
 738                            int flags, const char *dev_name,
 739                            void *data)
 740{
 741        return mount_nodev(type, flags, data, hppfs_fill_super);
 742}
 743
 744static struct file_system_type hppfs_type = {
 745        .owner          = THIS_MODULE,
 746        .name           = "hppfs",
 747        .mount          = hppfs_read_super,
 748        .kill_sb        = kill_anon_super,
 749        .fs_flags       = 0,
 750};
 751
 752static int __init init_hppfs(void)
 753{
 754        return register_filesystem(&hppfs_type);
 755}
 756
 757static void __exit exit_hppfs(void)
 758{
 759        unregister_filesystem(&hppfs_type);
 760}
 761
 762module_init(init_hppfs)
 763module_exit(exit_hppfs)
 764MODULE_LICENSE("GPL");
 765
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