symlink.c

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    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 
   19 static int affs_symlink_readpage(struct file *file, struct page *page)
   20 {
   21         struct buffer_head *bh;
   22         struct inode *inode = page->mapping->host;
   23         char *link = kmap(page);
   24         struct slink_front *lf;
   25         int err;
   26         int                      i, j;
   27         char                     c;
   28         char                     lc;
   29         char                    *pf;
   30 
   31         pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
   32 
   33         err = -EIO;
   34         lock_kernel();
   35         bh = affs_bread(inode->i_sb, inode->i_ino);
   36         unlock_kernel();
   37         if (!bh)
   38                 goto fail;
   39         i  = 0;
   40         j  = 0;
   41         lf = (struct slink_front *)bh->b_data;
   42         lc = 0;
   43         pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/";
   44 
   45         if (strchr(lf->symname,':')) {  /* Handle assign or volume name */
   46                 while (i < 1023 && (c = pf[i]))
   47                         link[i++] = c;
   48                 while (i < 1023 && lf->symname[j] != ':')
   49                         link[i++] = lf->symname[j++];
   50                 if (i < 1023)
   51                         link[i++] = '/';
   52                 j++;
   53                 lc = '/';
   54         }
   55         while (i < 1023 && (c = lf->symname[j])) {
   56                 if (c == '/' && lc == '/' && i < 1020) {        /* parent dir */
   57                         link[i++] = '.';
   58                         link[i++] = '.';
   59                 }
   60                 link[i++] = c;
   61                 lc = c;
   62                 j++;
   63         }
   64         link[i] = '\0';
   65         lock_kernel();
   66         affs_brelse(bh);
   67         unlock_kernel();
   68         SetPageUptodate(page);
   69         kunmap(page);
   70         UnlockPage(page);
   71         return 0;
   72 fail:
   73         SetPageError(page);
   74         kunmap(page);
   75         UnlockPage(page);
   76         return err;
   77 }
   78 
   79 struct address_space_operations affs_symlink_aops = {
   80         readpage:       affs_symlink_readpage,
   81 };
   82 
   83 struct inode_operations affs_symlink_inode_operations = {
   84         readlink:       page_readlink,
   85         follow_link:    page_follow_link,
   86         setattr:        affs_notify_change,
   87 };

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FreeBSD/Linux Kernel Cross Reference sys/fs/affs/symlink.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/affs/symlink.c