fs/affs/symlink.c

   1 /*
   2  *  linux/fs/affs/symlink.c
   3  *
   4  *  1995  Hans-Joachim Widmaier - Modified for affs.
   5  *
   6  *  Copyright (C) 1991, 1992  Linus Torvalds
   7  *
   8  *  affs symlink handling code
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/fs.h>
  13 #include <linux/stat.h>
  14 #include <linux/affs_fs.h>
  15 #include <linux/amigaffs.h>
  16 #include <linux/pagemap.h>
  17
  18 static int affs_symlink_readpage(struct dentry *dentry, struct page *page)
  19 {
  20         struct buffer_head *bh;
  21         struct inode *inode = dentry->d_inode;
  22         char *link = (char*)kmap(page);
  23         struct slink_front *lf;
  24         int err;
  25         int                      i, j;
  26         char                     c;
  27         char                     lc;
  28         char                    *pf;
  29
  30         pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
  31
  32         err = -EIO;
  33         bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
  34         if (!bh)
  35                 goto fail;
  36         i  = 0;
  37         j  = 0;
  38         lf = (struct slink_front *)bh->b_data;
  39         lc = 0;
  40         pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/";
  41
  42         if (strchr(lf->symname,':')) {  /* Handle assign or volume name */
  43                 while (i < 1023 && (c = pf[i]))
  44                         link[i++] = c;
  45                 while (i < 1023 && lf->symname[j] != ':')
  46                         link[i++] = lf->symname[j++];
  47                 if (i < 1023)
  48                         link[i++] = '/';
  49                 j++;
  50                 lc = '/';
  51         }
  52         while (i < 1023 && (c = lf->symname[j])) {
  53                 if (c == '/' && lc == '/' && i < 1020) {        /* parent dir */
  54                         link[i++] = '.';
  55                         link[i++] = '.';
  56                 }
  57                 link[i++] = c;
  58                 lc = c;
  59                 j++;
  60         }
  61         link[i] = '\0';
  62         affs_brelse(bh);
  63         SetPageUptodate(page);
  64         kunmap(page);
  65         UnlockPage(page);
  66         return 0;
  67 fail:
  68         SetPageError(page);
  69         kunmap(page);
  70         UnlockPage(page);
  71         return err;
  72 }
  73
  74 struct inode_operations affs_symlink_inode_operations = {
  75         readlink:       page_readlink,
  76         follow_link:    page_follow_link,
  77         readpage:       affs_symlink_readpage,
  78 };