cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

symlink.c (2523B)

      1/*
      2 *  linux/cluster/ssi/cfs/symlink.c
      3 *
      4 *	This program is free software; you can redistribute it and/or
      5 *	modify it under the terms of the GNU General Public License as
      6 *	published by the Free Software Foundation; either version 2 of
      7 *	the License, or (at your option) any later version.
      8 *
      9 *	This program is distributed in the hope that it will be useful,
     10 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 *	MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
     12 *	or NON INFRINGEMENT.  See the GNU General Public License for more
     13 *	details.
     14 *
     15 * 	You should have received a copy of the GNU General Public License
     16 * 	along with this program; if not, write to the Free Software
     17 * 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     18 *
     19 *	Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
     20 *
     21 *  Copyright (C) 1992  Rick Sladkey
     22 *
     23 *  Optimization changes Copyright (C) 1994 Florian La Roche
     24 *
     25 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
     26 *
     27 *  Portions Copyright (C) 2001 Compaq Computer Corporation
     28 *
     29 *  ocfs2 symlink handling code.
     30 *
     31 *  Copyright (C) 2004, 2005 Oracle.
     32 *
     33 */
     34
     35#include <linux/fs.h>
     36#include <linux/types.h>
     37#include <linux/slab.h>
     38#include <linux/pagemap.h>
     39#include <linux/namei.h>
     40
     41#include <cluster/masklog.h>
     42
     43#include "ocfs2.h"
     44
     45#include "alloc.h"
     46#include "file.h"
     47#include "inode.h"
     48#include "journal.h"
     49#include "symlink.h"
     50#include "xattr.h"
     51
     52#include "buffer_head_io.h"
     53
     54
     55static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
     56{
     57	struct page *page = &folio->page;
     58	struct inode *inode = page->mapping->host;
     59	struct buffer_head *bh = NULL;
     60	int status = ocfs2_read_inode_block(inode, &bh);
     61	struct ocfs2_dinode *fe;
     62	const char *link;
     63	void *kaddr;
     64	size_t len;
     65
     66	if (status < 0) {
     67		mlog_errno(status);
     68		return status;
     69	}
     70
     71	fe = (struct ocfs2_dinode *) bh->b_data;
     72	link = (char *) fe->id2.i_symlink;
     73	/* will be less than a page size */
     74	len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
     75	kaddr = kmap_atomic(page);
     76	memcpy(kaddr, link, len + 1);
     77	kunmap_atomic(kaddr);
     78	SetPageUptodate(page);
     79	unlock_page(page);
     80	brelse(bh);
     81	return 0;
     82}
     83
     84const struct address_space_operations ocfs2_fast_symlink_aops = {
     85	.read_folio		= ocfs2_fast_symlink_read_folio,
     86};
     87
     88const struct inode_operations ocfs2_symlink_inode_operations = {
     89	.get_link	= page_get_link,
     90	.getattr	= ocfs2_getattr,
     91	.setattr	= ocfs2_setattr,
     92	.listxattr	= ocfs2_listxattr,
     93	.fiemap		= ocfs2_fiemap,
     94};