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>
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
|
|
* 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,
|
|
};
|