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 #include <linux/smp_lock.h>
  18 #include <linux/buffer_head.h>
  19
  20 static int affs_symlink_readpage(struct file *file, struct page *page)
  21 {
  22         struct buffer_head *bh;
  23         struct inode *inode = page->mapping->host;
  24         char *link = kmap(page);
  25         struct slink_front *lf;
  26         int err;
  27         int                      i, j;
  28         char                     c;
  29         char                     lc;
  30         char                    *pf;
  31
  32         pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
  33
  34         err = -EIO;
  35         bh = affs_bread(inode->i_sb, inode->i_ino);
  36         if (!bh)
  37                 goto fail;
  38         i  = 0;
  39         j  = 0;
  40         lf = (struct slink_front *)bh->b_data;
  41         lc = 0;
  42         pf = AFFS_SB(inode->i_sb)->s_prefix ? AFFS_SB(inode->i_sb)->s_prefix : "/";
  43
  44         if (strchr(lf->symname,':')) {  /* Handle assign or volume name */
  45                 while (i < 1023 && (c = pf[i]))
  46                         link[i++] = c;
  47                 while (i < 1023 && lf->symname[j] != ':')
  48                         link[i++] = lf->symname[j++];
  49                 if (i < 1023)
  50                         link[i++] = '/';
  51                 j++;
  52                 lc = '/';
  53         }
  54         while (i < 1023 && (c = lf->symname[j])) {
  55                 if (c == '/' && lc == '/' && i < 1020) {        /* parent dir */
  56                         link[i++] = '.';
  57                         link[i++] = '.';
  58                 }
  59                 link[i++] = c;
  60                 lc = c;
  61                 j++;
  62         }
  63         link[i] = '\0';
  64         affs_brelse(bh);
  65         SetPageUptodate(page);
  66         kunmap(page);
  67         unlock_page(page);
  68         return 0;
  69 fail:
  70         SetPageError(page);
  71         kunmap(page);
  72         unlock_page(page);
  73         return err;
  74 }
  75
  76 struct address_space_operations affs_symlink_aops = {
  77         .readpage       = affs_symlink_readpage,
  78 };
  79
  80 struct inode_operations affs_symlink_inode_operations = {
  81         .readlink       = page_readlink,
  82         .follow_link    = page_follow_link,
  83         .setattr        = affs_notify_change,
  84 };