dir_fplus.c

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    1 /*
    2  *  linux/fs/adfs/dir_fplus.c
    3  *
    4  *  Copyright (C) 1997-1999 Russell King
    5  *
    6  * This program is free software; you can redistribute it and/or modify
    7  * it under the terms of the GNU General Public License version 2 as
    8  * published by the Free Software Foundation.
    9  */
   10 #include <linux/version.h>
   11 #include <linux/errno.h>
   12 #include <linux/fs.h>
   13 #include <linux/adfs_fs.h>
   14 #include <linux/sched.h>
   15 #include <linux/stat.h>
   16 #include <linux/spinlock.h>
   17 
   18 #include "adfs.h"
   19 #include "dir_fplus.h"
   20 
   21 static int
   22 adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
   23 {
   24         struct adfs_bigdirheader *h;
   25         struct adfs_bigdirtail *t;
   26         unsigned long block;
   27         unsigned int blk, size;
   28         int i, ret = -EIO;
   29 
   30         dir->nr_buffers = 0;
   31 
   32         block = __adfs_block_map(sb, id, 0);
   33         if (!block) {
   34                 adfs_error(sb, "dir object %X has a hole at offset 0", id);
   35                 goto out;
   36         }
   37 
   38         dir->bh[0] = sb_bread(sb, block);
   39         if (!dir->bh[0])
   40                 goto out;
   41         dir->nr_buffers += 1;
   42 
   43         h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
   44         size = le32_to_cpu(h->bigdirsize);
   45         if (size != sz) {
   46                 printk(KERN_WARNING "adfs: adfs_fplus_read: directory header size\n"
   47                                 " does not match directory size\n");
   48         }
   49 
   50         if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
   51             h->bigdirversion[2] != 0 || size & 2047 ||
   52             h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME))
   53                 goto out;
   54 
   55         size >>= sb->s_blocksize_bits;
   56         for (blk = 1; blk < size; blk++) {
   57                 block = __adfs_block_map(sb, id, blk);
   58                 if (!block) {
   59                         adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
   60                         goto out;
   61                 }
   62 
   63                 dir->bh[blk] = sb_bread(sb, block);
   64                 if (!dir->bh[blk])
   65                         goto out;
   66                 dir->nr_buffers = blk;
   67         }
   68 
   69         t = (struct adfs_bigdirtail *)(dir->bh[size - 1]->b_data + (sb->s_blocksize - 8));
   70 
   71         if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
   72             t->bigdirendmasseq != h->startmasseq ||
   73             t->reserved[0] != 0 || t->reserved[1] != 0)
   74                 goto out;
   75 
   76         dir->parent_id = le32_to_cpu(h->bigdirparent);
   77         dir->sb = sb;
   78         return 0;
   79 out:
   80         for (i = 0; i < dir->nr_buffers; i++)
   81                 brelse(dir->bh[i]);
   82         dir->sb = NULL;
   83         return ret;
   84 }
   85 
   86 static int
   87 adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
   88 {
   89         struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
   90         int ret = -ENOENT;
   91 
   92         if (fpos <= le32_to_cpu(h->bigdirentries)) {
   93                 dir->pos = fpos;
   94                 ret = 0;
   95         }
   96 
   97         return ret;
   98 }
   99 
  100 static void
  101 dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
  102 {
  103         struct super_block *sb = dir->sb;
  104         unsigned int buffer, partial, remainder;
  105 
  106         buffer = offset >> sb->s_blocksize_bits;
  107         offset &= sb->s_blocksize - 1;
  108 
  109         partial = sb->s_blocksize - offset;
  110 
  111         if (partial >= len)
  112                 memcpy(to, dir->bh[buffer]->b_data + offset, len);
  113         else {
  114                 char *c = (char *)to;
  115 
  116                 remainder = len - partial;
  117 
  118                 memcpy(c, dir->bh[buffer]->b_data + offset, partial);
  119                 memcpy(c + partial, dir->bh[buffer + 1]->b_data, remainder);
  120         }
  121 }
  122 
  123 static int
  124 adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
  125 {
  126         struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
  127         struct adfs_bigdirentry bde;
  128         unsigned int offset;
  129         int i, ret = -ENOENT;
  130 
  131         if (dir->pos >= le32_to_cpu(h->bigdirentries))
  132                 goto out;
  133 
  134         offset = offsetof(struct adfs_bigdirheader, bigdirname);
  135         offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
  136         offset += dir->pos * sizeof(struct adfs_bigdirentry);
  137 
  138         dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
  139 
  140         obj->loadaddr = le32_to_cpu(bde.bigdirload);
  141         obj->execaddr = le32_to_cpu(bde.bigdirexec);
  142         obj->size     = le32_to_cpu(bde.bigdirlen);
  143         obj->file_id  = le32_to_cpu(bde.bigdirindaddr);
  144         obj->attr     = le32_to_cpu(bde.bigdirattr);
  145         obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
  146 
  147         offset = offsetof(struct adfs_bigdirheader, bigdirname);
  148         offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
  149         offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
  150         offset += le32_to_cpu(bde.bigdirobnameptr);
  151 
  152         dir_memcpy(dir, offset, obj->name, obj->name_len);
  153         for (i = 0; i < obj->name_len; i++)
  154                 if (obj->name[i] == '/')
  155                         obj->name[i] = '.';
  156 
  157         dir->pos += 1;
  158         ret = 0;
  159 out:
  160         return ret;
  161 }
  162 
  163 static void
  164 adfs_fplus_free(struct adfs_dir *dir)
  165 {
  166         int i;
  167 
  168         for (i = 0; i < dir->nr_buffers; i++)
  169                 brelse(dir->bh[i]);
  170         dir->sb = NULL;
  171 }
  172 
  173 struct adfs_dir_ops adfs_fplus_dir_ops = {
  174         adfs_fplus_read,
  175         adfs_fplus_setpos,
  176         adfs_fplus_getnext,
  177         NULL,
  178         NULL,
  179         NULL,
  180         adfs_fplus_free
  181 };

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FreeBSD/Linux Kernel Cross Reference sys/fs/adfs/dir_fplus.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/adfs/dir_fplus.c