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 "affs.h"
  12
  13 static int affs_symlink_readpage(struct file *file, struct page *page)
  14 {
  15         struct buffer_head *bh;
  16         struct inode *inode = page->mapping->host;
  17         char *link = kmap(page);
  18         struct slink_front *lf;
  19         int err;
  20         int                      i, j;
  21         char                     c;
  22         char                     lc;
  23         char                    *pf;
  24
  25         pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
  26
  27         err = -EIO;
  28         bh = affs_bread(inode->i_sb, inode->i_ino);
  29         if (!bh)
  30                 goto fail;
  31         i  = 0;
  32         j  = 0;
  33         lf = (struct slink_front *)bh->b_data;
  34         lc = 0;
  35         pf = AFFS_SB(inode->i_sb)->s_prefix ? AFFS_SB(inode->i_sb)->s_prefix : "/";
  36
  37         if (strchr(lf->symname,':')) {  /* Handle assign or volume name */
  38                 while (i < 1023 && (c = pf[i]))
  39                         link[i++] = c;
  40                 while (i < 1023 && lf->symname[j] != ':')
  41                         link[i++] = lf->symname[j++];
  42                 if (i < 1023)
  43                         link[i++] = '/';
  44                 j++;
  45                 lc = '/';
  46         }
  47         while (i < 1023 && (c = lf->symname[j])) {
  48                 if (c == '/' && lc == '/' && i < 1020) {        /* parent dir */
  49                         link[i++] = '.';
  50                         link[i++] = '.';
  51                 }
  52                 link[i++] = c;
  53                 lc = c;
  54                 j++;
  55         }
  56         link[i] = '\0';
  57         affs_brelse(bh);
  58         SetPageUptodate(page);
  59         kunmap(page);
  60         unlock_page(page);
  61         return 0;
  62 fail:
  63         SetPageError(page);
  64         kunmap(page);
  65         unlock_page(page);
  66         return err;
  67 }
  68
  69 const struct address_space_operations affs_symlink_aops = {
  70         .readpage       = affs_symlink_readpage,
  71 };
  72
  73 struct inode_operations affs_symlink_inode_operations = {
  74         .readlink       = generic_readlink,
  75         .follow_link    = page_follow_link_light,
  76         .put_link       = page_put_link,
  77         .setattr        = affs_notify_change,
  78 };