// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/affs/symlink.c
 *
 *  1995  Hans-Joachim Widmaier - Modified for affs.
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  affs symlink handling code
 */

#include "affs.h"

static int affs_symlink_read_folio(struct file *file, struct folio *folio)
{
        struct buffer_head *bh;
        struct inode *inode = folio->mapping->host;
        char *link = folio_address(folio);
        struct slink_front *lf;
        int                      i, j;
        char                     c;
        char                     lc;

        pr_debug("get_link(ino=%lu)\n", inode->i_ino);

        bh = affs_bread(inode->i_sb, inode->i_ino);
        if (!bh)
                goto fail;
        i  = 0;
        j  = 0;
        lf = (struct slink_front *)bh->b_data;
        lc = 0;

        if (strchr(lf->symname,':')) {  /* Handle assign or volume name */
                struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
                char *pf;
                spin_lock(&sbi->symlink_lock);
                pf = sbi->s_prefix ? sbi->s_prefix : "/";
                while (i < 1023 && (c = pf[i]))
                        link[i++] = c;
                spin_unlock(&sbi->symlink_lock);
                while (i < 1023 && lf->symname[j] != ':')
                        link[i++] = lf->symname[j++];
                if (i < 1023)
                        link[i++] = '/';
                j++;
                lc = '/';
        }
        while (i < 1023 && (c = lf->symname[j])) {
                if (c == '/' && lc == '/' && i < 1020) {        /* parent dir */
                        link[i++] = '.';
                        link[i++] = '.';
                }
                link[i++] = c;
                lc = c;
                j++;
        }
        link[i] = '\0';
        affs_brelse(bh);
        folio_mark_uptodate(folio);
        folio_unlock(folio);
        return 0;
fail:
        folio_unlock(folio);
        return -EIO;
}

const struct address_space_operations affs_symlink_aops = {
        .read_folio     = affs_symlink_read_folio,
};

const struct inode_operations affs_symlink_inode_operations = {
        .get_link       = page_get_link,
        .setattr        = affs_notify_change,
};