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29333920a5
A couple of fields in affs_sb_info is used in follow_link() and symlink() for handling AFFS "absolute" symlinks. Need locking against affs_remount() updates. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
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* linux/fs/affs/symlink.c
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*
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* 1995 Hans-Joachim Widmaier - Modified for affs.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* affs symlink handling code
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*/
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#include "affs.h"
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static int affs_symlink_readpage(struct file *file, struct page *page)
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{
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struct buffer_head *bh;
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struct inode *inode = page->mapping->host;
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char *link = kmap(page);
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struct slink_front *lf;
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int err;
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int i, j;
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char c;
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char lc;
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pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
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err = -EIO;
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bh = affs_bread(inode->i_sb, inode->i_ino);
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if (!bh)
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goto fail;
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i = 0;
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j = 0;
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lf = (struct slink_front *)bh->b_data;
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lc = 0;
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if (strchr(lf->symname,':')) { /* Handle assign or volume name */
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struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
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char *pf;
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spin_lock(&sbi->symlink_lock);
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pf = sbi->s_prefix ? sbi->s_prefix : "/";
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while (i < 1023 && (c = pf[i]))
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link[i++] = c;
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spin_unlock(&sbi->symlink_lock);
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while (i < 1023 && lf->symname[j] != ':')
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link[i++] = lf->symname[j++];
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if (i < 1023)
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link[i++] = '/';
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j++;
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lc = '/';
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}
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while (i < 1023 && (c = lf->symname[j])) {
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if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
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link[i++] = '.';
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link[i++] = '.';
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}
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link[i++] = c;
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lc = c;
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j++;
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}
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link[i] = '\0';
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affs_brelse(bh);
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SetPageUptodate(page);
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kunmap(page);
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unlock_page(page);
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return 0;
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fail:
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SetPageError(page);
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kunmap(page);
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unlock_page(page);
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return err;
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}
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const struct address_space_operations affs_symlink_aops = {
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.readpage = affs_symlink_readpage,
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};
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const struct inode_operations affs_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.setattr = affs_notify_change,
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};
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