symlink.c

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/*
 *  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_readpage(struct file *file, struct page *page)
{
    struct buffer_head *bh;
    struct inode *inode = page->mapping->host;
    char *link = kmap(page);
    struct slink_front *lf;
    int err;
    int          i, j;
    char             c;
    char             lc;

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

    err = -EIO;
    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);
    SetPageUptodate(page);
    kunmap(page);
    unlock_page(page);
    return 0;
fail:
    SetPageError(page);
    kunmap(page);
    unlock_page(page);
    return err;
}

const struct address_space_operations affs_symlink_aops = {
    .readpage   = affs_symlink_readpage,
};

const struct inode_operations affs_symlink_inode_operations = {
    .readlink   = generic_readlink,
    .follow_link    = page_follow_link_light,
    .put_link   = page_put_link,
    .setattr    = affs_notify_change,
};