linux/fs/befs/linuxvfs.c
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   1/*
   2 * linux/fs/befs/linuxvfs.c
   3 *
   4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
   5 *
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/slab.h>
  10#include <linux/fs.h>
  11#include <linux/errno.h>
  12#include <linux/stat.h>
  13#include <linux/nls.h>
  14#include <linux/buffer_head.h>
  15#include <linux/vfs.h>
  16#include <linux/parser.h>
  17#include <linux/namei.h>
  18
  19#include "befs.h"
  20#include "btree.h"
  21#include "inode.h"
  22#include "datastream.h"
  23#include "super.h"
  24#include "io.h"
  25
  26MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
  27MODULE_AUTHOR("Will Dyson");
  28MODULE_LICENSE("GPL");
  29
  30/* The units the vfs expects inode->i_blocks to be in */
  31#define VFS_BLOCK_SIZE 512
  32
  33static int befs_readdir(struct file *, void *, filldir_t);
  34static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
  35static int befs_readpage(struct file *file, struct page *page);
  36static sector_t befs_bmap(struct address_space *mapping, sector_t block);
  37static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *);
  38static struct inode *befs_iget(struct super_block *, unsigned long);
  39static struct inode *befs_alloc_inode(struct super_block *sb);
  40static void befs_destroy_inode(struct inode *inode);
  41static int befs_init_inodecache(void);
  42static void befs_destroy_inodecache(void);
  43static void *befs_follow_link(struct dentry *, struct nameidata *);
  44static void befs_put_link(struct dentry *, struct nameidata *, void *);
  45static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
  46                        char **out, int *out_len);
  47static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
  48                        char **out, int *out_len);
  49static void befs_put_super(struct super_block *);
  50static int befs_remount(struct super_block *, int *, char *);
  51static int befs_statfs(struct dentry *, struct kstatfs *);
  52static int parse_options(char *, befs_mount_options *);
  53
  54static const struct super_operations befs_sops = {
  55        .alloc_inode    = befs_alloc_inode,     /* allocate a new inode */
  56        .destroy_inode  = befs_destroy_inode, /* deallocate an inode */
  57        .put_super      = befs_put_super,       /* uninit super */
  58        .statfs         = befs_statfs,  /* statfs */
  59        .remount_fs     = befs_remount,
  60        .show_options   = generic_show_options,
  61};
  62
  63/* slab cache for befs_inode_info objects */
  64static struct kmem_cache *befs_inode_cachep;
  65
  66static const struct file_operations befs_dir_operations = {
  67        .read           = generic_read_dir,
  68        .readdir        = befs_readdir,
  69        .llseek         = generic_file_llseek,
  70};
  71
  72static const struct inode_operations befs_dir_inode_operations = {
  73        .lookup         = befs_lookup,
  74};
  75
  76static const struct address_space_operations befs_aops = {
  77        .readpage       = befs_readpage,
  78        .sync_page      = block_sync_page,
  79        .bmap           = befs_bmap,
  80};
  81
  82static const struct inode_operations befs_symlink_inode_operations = {
  83        .readlink       = generic_readlink,
  84        .follow_link    = befs_follow_link,
  85        .put_link       = befs_put_link,
  86};
  87
  88/* 
  89 * Called by generic_file_read() to read a page of data
  90 * 
  91 * In turn, simply calls a generic block read function and
  92 * passes it the address of befs_get_block, for mapping file
  93 * positions to disk blocks.
  94 */
  95static int
  96befs_readpage(struct file *file, struct page *page)
  97{
  98        return block_read_full_page(page, befs_get_block);
  99}
 100
 101static sector_t
 102befs_bmap(struct address_space *mapping, sector_t block)
 103{
 104        return generic_block_bmap(mapping, block, befs_get_block);
 105}
 106
 107/* 
 108 * Generic function to map a file position (block) to a 
 109 * disk offset (passed back in bh_result).
 110 *
 111 * Used by many higher level functions.
 112 *
 113 * Calls befs_fblock2brun() in datastream.c to do the real work.
 114 *
 115 * -WD 10-26-01
 116 */
 117
 118static int
 119befs_get_block(struct inode *inode, sector_t block,
 120               struct buffer_head *bh_result, int create)
 121{
 122        struct super_block *sb = inode->i_sb;
 123        befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
 124        befs_block_run run = BAD_IADDR;
 125        int res = 0;
 126        ulong disk_off;
 127
 128        befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
 129                   inode->i_ino, block);
 130
 131        if (block < 0) {
 132                befs_error(sb, "befs_get_block() was asked for a block "
 133                           "number less than zero: block %ld in inode %lu",
 134                           block, inode->i_ino);
 135                return -EIO;
 136        }
 137
 138        if (create) {
 139                befs_error(sb, "befs_get_block() was asked to write to "
 140                           "block %ld in inode %lu", block, inode->i_ino);
 141                return -EPERM;
 142        }
 143
 144        res = befs_fblock2brun(sb, ds, block, &run);
 145        if (res != BEFS_OK) {
 146                befs_error(sb,
 147                           "<--- befs_get_block() for inode %lu, block "
 148                           "%ld ERROR", inode->i_ino, block);
 149                return -EFBIG;
 150        }
 151
 152        disk_off = (ulong) iaddr2blockno(sb, &run);
 153
 154        map_bh(bh_result, inode->i_sb, disk_off);
 155
 156        befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
 157                   "disk address %lu", inode->i_ino, block, disk_off);
 158
 159        return 0;
 160}
 161
 162static struct dentry *
 163befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 164{
 165        struct inode *inode = NULL;
 166        struct super_block *sb = dir->i_sb;
 167        befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
 168        befs_off_t offset;
 169        int ret;
 170        int utfnamelen;
 171        char *utfname;
 172        const char *name = dentry->d_name.name;
 173
 174        befs_debug(sb, "---> befs_lookup() "
 175                   "name %s inode %ld", dentry->d_name.name, dir->i_ino);
 176
 177        /* Convert to UTF-8 */
 178        if (BEFS_SB(sb)->nls) {
 179                ret =
 180                    befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
 181                if (ret < 0) {
 182                        befs_debug(sb, "<--- befs_lookup() ERROR");
 183                        return ERR_PTR(ret);
 184                }
 185                ret = befs_btree_find(sb, ds, utfname, &offset);
 186                kfree(utfname);
 187
 188        } else {
 189                ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
 190        }
 191
 192        if (ret == BEFS_BT_NOT_FOUND) {
 193                befs_debug(sb, "<--- befs_lookup() %s not found",
 194                           dentry->d_name.name);
 195                return ERR_PTR(-ENOENT);
 196
 197        } else if (ret != BEFS_OK || offset == 0) {
 198                befs_warning(sb, "<--- befs_lookup() Error");
 199                return ERR_PTR(-ENODATA);
 200        }
 201
 202        inode = befs_iget(dir->i_sb, (ino_t) offset);
 203        if (IS_ERR(inode))
 204                return ERR_CAST(inode);
 205
 206        d_add(dentry, inode);
 207
 208        befs_debug(sb, "<--- befs_lookup()");
 209
 210        return NULL;
 211}
 212
 213static int
 214befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 215{
 216        struct inode *inode = filp->f_path.dentry->d_inode;
 217        struct super_block *sb = inode->i_sb;
 218        befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
 219        befs_off_t value;
 220        int result;
 221        size_t keysize;
 222        unsigned char d_type;
 223        char keybuf[BEFS_NAME_LEN + 1];
 224        char *nlsname;
 225        int nlsnamelen;
 226        const char *dirname = filp->f_path.dentry->d_name.name;
 227
 228        befs_debug(sb, "---> befs_readdir() "
 229                   "name %s, inode %ld, filp->f_pos %Ld",
 230                   dirname, inode->i_ino, filp->f_pos);
 231
 232        result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
 233                                 keybuf, &keysize, &value);
 234
 235        if (result == BEFS_ERR) {
 236                befs_debug(sb, "<--- befs_readdir() ERROR");
 237                befs_error(sb, "IO error reading %s (inode %lu)",
 238                           dirname, inode->i_ino);
 239                return -EIO;
 240
 241        } else if (result == BEFS_BT_END) {
 242                befs_debug(sb, "<--- befs_readdir() END");
 243                return 0;
 244
 245        } else if (result == BEFS_BT_EMPTY) {
 246                befs_debug(sb, "<--- befs_readdir() Empty directory");
 247                return 0;
 248        }
 249
 250        d_type = DT_UNKNOWN;
 251
 252        /* Convert to NLS */
 253        if (BEFS_SB(sb)->nls) {
 254                result =
 255                    befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
 256                if (result < 0) {
 257                        befs_debug(sb, "<--- befs_readdir() ERROR");
 258                        return result;
 259                }
 260                result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
 261                                 (ino_t) value, d_type);
 262                kfree(nlsname);
 263
 264        } else {
 265                result = filldir(dirent, keybuf, keysize, filp->f_pos,
 266                                 (ino_t) value, d_type);
 267        }
 268
 269        filp->f_pos++;
 270
 271        befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
 272
 273        return 0;
 274}
 275
 276static struct inode *
 277befs_alloc_inode(struct super_block *sb)
 278{
 279        struct befs_inode_info *bi;
 280        bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
 281                                                        GFP_KERNEL);
 282        if (!bi)
 283                return NULL;
 284        return &bi->vfs_inode;
 285}
 286
 287static void
 288befs_destroy_inode(struct inode *inode)
 289{
 290        kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
 291}
 292
 293static void init_once(void *foo)
 294{
 295        struct befs_inode_info *bi = (struct befs_inode_info *) foo;
 296
 297        inode_init_once(&bi->vfs_inode);
 298}
 299
 300static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
 301{
 302        struct buffer_head *bh = NULL;
 303        befs_inode *raw_inode = NULL;
 304
 305        befs_sb_info *befs_sb = BEFS_SB(sb);
 306        befs_inode_info *befs_ino = NULL;
 307        struct inode *inode;
 308        long ret = -EIO;
 309
 310        befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
 311
 312        inode = iget_locked(sb, ino);
 313        if (IS_ERR(inode))
 314                return inode;
 315        if (!(inode->i_state & I_NEW))
 316                return inode;
 317
 318        befs_ino = BEFS_I(inode);
 319
 320        /* convert from vfs's inode number to befs's inode number */
 321        befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
 322
 323        befs_debug(sb, "  real inode number [%u, %hu, %hu]",
 324                   befs_ino->i_inode_num.allocation_group,
 325                   befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
 326
 327        bh = befs_bread(sb, inode->i_ino);
 328        if (!bh) {
 329                befs_error(sb, "unable to read inode block - "
 330                           "inode = %lu", inode->i_ino);
 331                goto unacquire_none;
 332        }
 333
 334        raw_inode = (befs_inode *) bh->b_data;
 335
 336        befs_dump_inode(sb, raw_inode);
 337
 338        if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
 339                befs_error(sb, "Bad inode: %lu", inode->i_ino);
 340                goto unacquire_bh;
 341        }
 342
 343        inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
 344
 345        /*
 346         * set uid and gid.  But since current BeOS is single user OS, so
 347         * you can change by "uid" or "gid" options.
 348         */   
 349
 350        inode->i_uid = befs_sb->mount_opts.use_uid ?
 351            befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
 352        inode->i_gid = befs_sb->mount_opts.use_gid ?
 353            befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
 354
 355        inode->i_nlink = 1;
 356
 357        /*
 358         * BEFS's time is 64 bits, but current VFS is 32 bits...
 359         * BEFS don't have access time. Nor inode change time. VFS
 360         * doesn't have creation time.
 361         * Also, the lower 16 bits of the last_modified_time and 
 362         * create_time are just a counter to help ensure uniqueness
 363         * for indexing purposes. (PFD, page 54)
 364         */
 365
 366        inode->i_mtime.tv_sec =
 367            fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
 368        inode->i_mtime.tv_nsec = 0;   /* lower 16 bits are not a time */        
 369        inode->i_ctime = inode->i_mtime;
 370        inode->i_atime = inode->i_mtime;
 371
 372        befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
 373        befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
 374        befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
 375        befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
 376
 377        if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
 378                inode->i_size = 0;
 379                inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
 380                strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
 381                        BEFS_SYMLINK_LEN - 1);
 382                befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
 383        } else {
 384                int num_blks;
 385
 386                befs_ino->i_data.ds =
 387                    fsds_to_cpu(sb, raw_inode->data.datastream);
 388
 389                num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
 390                inode->i_blocks =
 391                    num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
 392                inode->i_size = befs_ino->i_data.ds.size;
 393        }
 394
 395        inode->i_mapping->a_ops = &befs_aops;
 396
 397        if (S_ISREG(inode->i_mode)) {
 398                inode->i_fop = &generic_ro_fops;
 399        } else if (S_ISDIR(inode->i_mode)) {
 400                inode->i_op = &befs_dir_inode_operations;
 401                inode->i_fop = &befs_dir_operations;
 402        } else if (S_ISLNK(inode->i_mode)) {
 403                inode->i_op = &befs_symlink_inode_operations;
 404        } else {
 405                befs_error(sb, "Inode %lu is not a regular file, "
 406                           "directory or symlink. THAT IS WRONG! BeFS has no "
 407                           "on disk special files", inode->i_ino);
 408                goto unacquire_bh;
 409        }
 410
 411        brelse(bh);
 412        befs_debug(sb, "<--- befs_read_inode()");
 413        unlock_new_inode(inode);
 414        return inode;
 415
 416      unacquire_bh:
 417        brelse(bh);
 418
 419      unacquire_none:
 420        iget_failed(inode);
 421        befs_debug(sb, "<--- befs_read_inode() - Bad inode");
 422        return ERR_PTR(ret);
 423}
 424
 425/* Initialize the inode cache. Called at fs setup.
 426 *
 427 * Taken from NFS implementation by Al Viro.
 428 */
 429static int
 430befs_init_inodecache(void)
 431{
 432        befs_inode_cachep = kmem_cache_create("befs_inode_cache",
 433                                              sizeof (struct befs_inode_info),
 434                                              0, (SLAB_RECLAIM_ACCOUNT|
 435                                                SLAB_MEM_SPREAD),
 436                                              init_once);
 437        if (befs_inode_cachep == NULL) {
 438                printk(KERN_ERR "befs_init_inodecache: "
 439                       "Couldn't initalize inode slabcache\n");
 440                return -ENOMEM;
 441        }
 442
 443        return 0;
 444}
 445
 446/* Called at fs teardown.
 447 * 
 448 * Taken from NFS implementation by Al Viro.
 449 */
 450static void
 451befs_destroy_inodecache(void)
 452{
 453        kmem_cache_destroy(befs_inode_cachep);
 454}
 455
 456/*
 457 * The inode of symbolic link is different to data stream.
 458 * The data stream become link name. Unless the LONG_SYMLINK
 459 * flag is set.
 460 */
 461static void *
 462befs_follow_link(struct dentry *dentry, struct nameidata *nd)
 463{
 464        befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
 465        char *link;
 466
 467        if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
 468                struct super_block *sb = dentry->d_sb;
 469                befs_data_stream *data = &befs_ino->i_data.ds;
 470                befs_off_t len = data->size;
 471
 472                befs_debug(sb, "Follow long symlink");
 473
 474                link = kmalloc(len, GFP_NOFS);
 475                if (!link) {
 476                        link = ERR_PTR(-ENOMEM);
 477                } else if (befs_read_lsymlink(sb, data, link, len) != len) {
 478                        kfree(link);
 479                        befs_error(sb, "Failed to read entire long symlink");
 480                        link = ERR_PTR(-EIO);
 481                } else {
 482                        link[len - 1] = '\0';
 483                }
 484        } else {
 485                link = befs_ino->i_data.symlink;
 486        }
 487
 488        nd_set_link(nd, link);
 489        return NULL;
 490}
 491
 492static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
 493{
 494        befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
 495        if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
 496                char *link = nd_get_link(nd);
 497                if (!IS_ERR(link))
 498                        kfree(link);
 499        }
 500}
 501
 502/*
 503 * UTF-8 to NLS charset  convert routine
 504 * 
 505 *
 506 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
 507 * the nls tables directly
 508 */
 509
 510static int
 511befs_utf2nls(struct super_block *sb, const char *in,
 512             int in_len, char **out, int *out_len)
 513{
 514        struct nls_table *nls = BEFS_SB(sb)->nls;
 515        int i, o;
 516        unicode_t uni;
 517        int unilen, utflen;
 518        char *result;
 519        /* The utf8->nls conversion won't make the final nls string bigger
 520         * than the utf one, but if the string is pure ascii they'll have the
 521         * same width and an extra char is needed to save the additional \0
 522         */
 523        int maxlen = in_len + 1;
 524
 525        befs_debug(sb, "---> utf2nls()");
 526
 527        if (!nls) {
 528                befs_error(sb, "befs_utf2nls called with no NLS table loaded");
 529                return -EINVAL;
 530        }
 531
 532        *out = result = kmalloc(maxlen, GFP_NOFS);
 533        if (!*out) {
 534                befs_error(sb, "befs_utf2nls() cannot allocate memory");
 535                *out_len = 0;
 536                return -ENOMEM;
 537        }
 538
 539        for (i = o = 0; i < in_len; i += utflen, o += unilen) {
 540
 541                /* convert from UTF-8 to Unicode */
 542                utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
 543                if (utflen < 0)
 544                        goto conv_err;
 545
 546                /* convert from Unicode to nls */
 547                if (uni > MAX_WCHAR_T)
 548                        goto conv_err;
 549                unilen = nls->uni2char(uni, &result[o], in_len - o);
 550                if (unilen < 0)
 551                        goto conv_err;
 552        }
 553        result[o] = '\0';
 554        *out_len = o;
 555
 556        befs_debug(sb, "<--- utf2nls()");
 557
 558        return o;
 559
 560      conv_err:
 561        befs_error(sb, "Name using character set %s contains a character that "
 562                   "cannot be converted to unicode.", nls->charset);
 563        befs_debug(sb, "<--- utf2nls()");
 564        kfree(result);
 565        return -EILSEQ;
 566}
 567
 568/**
 569 * befs_nls2utf - Convert NLS string to utf8 encodeing
 570 * @sb: Superblock
 571 * @src: Input string buffer in NLS format
 572 * @srclen: Length of input string in bytes
 573 * @dest: The output string in UTF-8 format
 574 * @destlen: Length of the output buffer
 575 * 
 576 * Converts input string @src, which is in the format of the loaded NLS map,
 577 * into a utf8 string.
 578 * 
 579 * The destination string @dest is allocated by this function and the caller is
 580 * responsible for freeing it with kfree()
 581 * 
 582 * On return, *@destlen is the length of @dest in bytes.
 583 *
 584 * On success, the return value is the number of utf8 characters written to
 585 * the output buffer @dest.
 586 *  
 587 * On Failure, a negative number coresponding to the error code is returned.
 588 */
 589
 590static int
 591befs_nls2utf(struct super_block *sb, const char *in,
 592             int in_len, char **out, int *out_len)
 593{
 594        struct nls_table *nls = BEFS_SB(sb)->nls;
 595        int i, o;
 596        wchar_t uni;
 597        int unilen, utflen;
 598        char *result;
 599        /* There're nls characters that will translate to 3-chars-wide UTF-8
 600         * characters, a additional byte is needed to save the final \0
 601         * in special cases */
 602        int maxlen = (3 * in_len) + 1;
 603
 604        befs_debug(sb, "---> nls2utf()\n");
 605
 606        if (!nls) {
 607                befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
 608                return -EINVAL;
 609        }
 610
 611        *out = result = kmalloc(maxlen, GFP_NOFS);
 612        if (!*out) {
 613                befs_error(sb, "befs_nls2utf() cannot allocate memory");
 614                *out_len = 0;
 615                return -ENOMEM;
 616        }
 617
 618        for (i = o = 0; i < in_len; i += unilen, o += utflen) {
 619
 620                /* convert from nls to unicode */
 621                unilen = nls->char2uni(&in[i], in_len - i, &uni);
 622                if (unilen < 0)
 623                        goto conv_err;
 624
 625                /* convert from unicode to UTF-8 */
 626                utflen = utf32_to_utf8(uni, &result[o], 3);
 627                if (utflen <= 0)
 628                        goto conv_err;
 629        }
 630
 631        result[o] = '\0';
 632        *out_len = o;
 633
 634        befs_debug(sb, "<--- nls2utf()");
 635
 636        return i;
 637
 638      conv_err:
 639        befs_error(sb, "Name using charecter set %s contains a charecter that "
 640                   "cannot be converted to unicode.", nls->charset);
 641        befs_debug(sb, "<--- nls2utf()");
 642        kfree(result);
 643        return -EILSEQ;
 644}
 645
 646/**
 647 * Use the
 648 *
 649 */
 650enum {
 651        Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
 652};
 653
 654static const match_table_t befs_tokens = {
 655        {Opt_uid, "uid=%d"},
 656        {Opt_gid, "gid=%d"},
 657        {Opt_charset, "iocharset=%s"},
 658        {Opt_debug, "debug"},
 659        {Opt_err, NULL}
 660};
 661
 662static int
 663parse_options(char *options, befs_mount_options * opts)
 664{
 665        char *p;
 666        substring_t args[MAX_OPT_ARGS];
 667        int option;
 668
 669        /* Initialize options */
 670        opts->uid = 0;
 671        opts->gid = 0;
 672        opts->use_uid = 0;
 673        opts->use_gid = 0;
 674        opts->iocharset = NULL;
 675        opts->debug = 0;
 676
 677        if (!options)
 678                return 1;
 679
 680        while ((p = strsep(&options, ",")) != NULL) {
 681                int token;
 682                if (!*p)
 683                        continue;
 684
 685                token = match_token(p, befs_tokens, args);
 686                switch (token) {
 687                case Opt_uid:
 688                        if (match_int(&args[0], &option))
 689                                return 0;
 690                        if (option < 0) {
 691                                printk(KERN_ERR "BeFS: Invalid uid %d, "
 692                                                "using default\n", option);
 693                                break;
 694                        }
 695                        opts->uid = option;
 696                        opts->use_uid = 1;
 697                        break;
 698                case Opt_gid:
 699                        if (match_int(&args[0], &option))
 700                                return 0;
 701                        if (option < 0) {
 702                                printk(KERN_ERR "BeFS: Invalid gid %d, "
 703                                                "using default\n", option);
 704                                break;
 705                        }
 706                        opts->gid = option;
 707                        opts->use_gid = 1;
 708                        break;
 709                case Opt_charset:
 710                        kfree(opts->iocharset);
 711                        opts->iocharset = match_strdup(&args[0]);
 712                        if (!opts->iocharset) {
 713                                printk(KERN_ERR "BeFS: allocation failure for "
 714                                                "iocharset string\n");
 715                                return 0;
 716                        }
 717                        break;
 718                case Opt_debug:
 719                        opts->debug = 1;
 720                        break;
 721                default:
 722                        printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
 723                                        "or missing value\n", p);
 724                        return 0;
 725                }
 726        }
 727        return 1;
 728}
 729
 730/* This function has the responsibiltiy of getting the
 731 * filesystem ready for unmounting. 
 732 * Basicly, we free everything that we allocated in
 733 * befs_read_inode
 734 */
 735static void
 736befs_put_super(struct super_block *sb)
 737{
 738        kfree(BEFS_SB(sb)->mount_opts.iocharset);
 739        BEFS_SB(sb)->mount_opts.iocharset = NULL;
 740        unload_nls(BEFS_SB(sb)->nls);
 741        kfree(sb->s_fs_info);
 742        sb->s_fs_info = NULL;
 743}
 744
 745/* Allocate private field of the superblock, fill it.
 746 *
 747 * Finish filling the public superblock fields
 748 * Make the root directory
 749 * Load a set of NLS translations if needed.
 750 */
 751static int
 752befs_fill_super(struct super_block *sb, void *data, int silent)
 753{
 754        struct buffer_head *bh;
 755        befs_sb_info *befs_sb;
 756        befs_super_block *disk_sb;
 757        struct inode *root;
 758        long ret = -EINVAL;
 759        const unsigned long sb_block = 0;
 760        const off_t x86_sb_off = 512;
 761
 762        save_mount_options(sb, data);
 763
 764        sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
 765        if (sb->s_fs_info == NULL) {
 766                printk(KERN_ERR
 767                       "BeFS(%s): Unable to allocate memory for private "
 768                       "portion of superblock. Bailing.\n", sb->s_id);
 769                goto unacquire_none;
 770        }
 771        befs_sb = BEFS_SB(sb);
 772        memset(befs_sb, 0, sizeof(befs_sb_info));
 773
 774        if (!parse_options((char *) data, &befs_sb->mount_opts)) {
 775                befs_error(sb, "cannot parse mount options");
 776                goto unacquire_priv_sbp;
 777        }
 778
 779        befs_debug(sb, "---> befs_fill_super()");
 780
 781#ifndef CONFIG_BEFS_RW
 782        if (!(sb->s_flags & MS_RDONLY)) {
 783                befs_warning(sb,
 784                             "No write support. Marking filesystem read-only");
 785                sb->s_flags |= MS_RDONLY;
 786        }
 787#endif                          /* CONFIG_BEFS_RW */
 788
 789        /*
 790         * Set dummy blocksize to read super block.
 791         * Will be set to real fs blocksize later.
 792         *
 793         * Linux 2.4.10 and later refuse to read blocks smaller than
 794         * the hardsect size for the device. But we also need to read at 
 795         * least 1k to get the second 512 bytes of the volume.
 796         * -WD 10-26-01
 797         */ 
 798        sb_min_blocksize(sb, 1024);
 799
 800        if (!(bh = sb_bread(sb, sb_block))) {
 801                befs_error(sb, "unable to read superblock");
 802                goto unacquire_priv_sbp;
 803        }
 804
 805        /* account for offset of super block on x86 */
 806        disk_sb = (befs_super_block *) bh->b_data;
 807        if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
 808            (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
 809                befs_debug(sb, "Using PPC superblock location");
 810        } else {
 811                befs_debug(sb, "Using x86 superblock location");
 812                disk_sb =
 813                    (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
 814        }
 815
 816        if (befs_load_sb(sb, disk_sb) != BEFS_OK)
 817                goto unacquire_bh;
 818
 819        befs_dump_super_block(sb, disk_sb);
 820
 821        brelse(bh);
 822
 823        if (befs_check_sb(sb) != BEFS_OK)
 824                goto unacquire_priv_sbp;
 825
 826        if( befs_sb->num_blocks > ~((sector_t)0) ) {
 827                befs_error(sb, "blocks count: %Lu "
 828                        "is larger than the host can use",
 829                        befs_sb->num_blocks);
 830                goto unacquire_priv_sbp;
 831        }
 832
 833        /*
 834         * set up enough so that it can read an inode
 835         * Fill in kernel superblock fields from private sb
 836         */
 837        sb->s_magic = BEFS_SUPER_MAGIC;
 838        /* Set real blocksize of fs */
 839        sb_set_blocksize(sb, (ulong) befs_sb->block_size);
 840        sb->s_op = &befs_sops;
 841        root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
 842        if (IS_ERR(root)) {
 843                ret = PTR_ERR(root);
 844                goto unacquire_priv_sbp;
 845        }
 846        sb->s_root = d_alloc_root(root);
 847        if (!sb->s_root) {
 848                iput(root);
 849                befs_error(sb, "get root inode failed");
 850                goto unacquire_priv_sbp;
 851        }
 852
 853        /* load nls library */
 854        if (befs_sb->mount_opts.iocharset) {
 855                befs_debug(sb, "Loading nls: %s",
 856                           befs_sb->mount_opts.iocharset);
 857                befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
 858                if (!befs_sb->nls) {
 859                        befs_warning(sb, "Cannot load nls %s"
 860                                        " loading default nls",
 861                                        befs_sb->mount_opts.iocharset);
 862                        befs_sb->nls = load_nls_default();
 863                }
 864        /* load default nls if none is specified  in mount options */
 865        } else {
 866                befs_debug(sb, "Loading default nls");
 867                befs_sb->nls = load_nls_default();
 868        }
 869
 870        return 0;
 871/*****************/
 872      unacquire_bh:
 873        brelse(bh);
 874
 875      unacquire_priv_sbp:
 876        kfree(sb->s_fs_info);
 877
 878      unacquire_none:
 879        sb->s_fs_info = NULL;
 880        return ret;
 881}
 882
 883static int
 884befs_remount(struct super_block *sb, int *flags, char *data)
 885{
 886        if (!(*flags & MS_RDONLY))
 887                return -EINVAL;
 888        return 0;
 889}
 890
 891static int
 892befs_statfs(struct dentry *dentry, struct kstatfs *buf)
 893{
 894        struct super_block *sb = dentry->d_sb;
 895        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 896
 897        befs_debug(sb, "---> befs_statfs()");
 898
 899        buf->f_type = BEFS_SUPER_MAGIC;
 900        buf->f_bsize = sb->s_blocksize;
 901        buf->f_blocks = BEFS_SB(sb)->num_blocks;
 902        buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
 903        buf->f_bavail = buf->f_bfree;
 904        buf->f_files = 0;       /* UNKNOWN */
 905        buf->f_ffree = 0;       /* UNKNOWN */
 906        buf->f_fsid.val[0] = (u32)id;
 907        buf->f_fsid.val[1] = (u32)(id >> 32);
 908        buf->f_namelen = BEFS_NAME_LEN;
 909
 910        befs_debug(sb, "<--- befs_statfs()");
 911
 912        return 0;
 913}
 914
 915static int
 916befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
 917            void *data, struct vfsmount *mnt)
 918{
 919        return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super,
 920                           mnt);
 921}
 922
 923static struct file_system_type befs_fs_type = {
 924        .owner          = THIS_MODULE,
 925        .name           = "befs",
 926        .get_sb         = befs_get_sb,
 927        .kill_sb        = kill_block_super,
 928        .fs_flags       = FS_REQUIRES_DEV,      
 929};
 930
 931static int __init
 932init_befs_fs(void)
 933{
 934        int err;
 935
 936        printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
 937
 938        err = befs_init_inodecache();
 939        if (err)
 940                goto unacquire_none;
 941
 942        err = register_filesystem(&befs_fs_type);
 943        if (err)
 944                goto unacquire_inodecache;
 945
 946        return 0;
 947
 948unacquire_inodecache:
 949        befs_destroy_inodecache();
 950
 951unacquire_none:
 952        return err;
 953}
 954
 955static void __exit
 956exit_befs_fs(void)
 957{
 958        befs_destroy_inodecache();
 959
 960        unregister_filesystem(&befs_fs_type);
 961}
 962
 963/*
 964Macros that typecheck the init and exit functions,
 965ensures that they are called at init and cleanup,
 966and eliminates warnings about unused functions.
 967*/
 968module_init(init_befs_fs)
 969module_exit(exit_befs_fs)
 970