cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vxfs_immed.c (1334B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2000-2001 Christoph Hellwig.
      4 */
      5
      6/*
      7 * Veritas filesystem driver - support for 'immed' inodes.
      8 */
      9#include <linux/fs.h>
     10#include <linux/pagemap.h>
     11
     12#include "vxfs.h"
     13#include "vxfs_extern.h"
     14#include "vxfs_inode.h"
     15
     16
     17static int	vxfs_immed_read_folio(struct file *, struct folio *);
     18
     19/*
     20 * Address space operations for immed files and directories.
     21 */
     22const struct address_space_operations vxfs_immed_aops = {
     23	.read_folio =		vxfs_immed_read_folio,
     24};
     25
     26/**
     27 * vxfs_immed_read_folio - read part of an immed inode into pagecache
     28 * @file:	file context (unused)
     29 * @folio:	folio to fill in.
     30 *
     31 * Description:
     32 *   vxfs_immed_read_folio reads a part of the immed area of the
     33 *   file that hosts @pp into the pagecache.
     34 *
     35 * Returns:
     36 *   Zero on success, else a negative error code.
     37 *
     38 * Locking status:
     39 *   @folio is locked and will be unlocked.
     40 */
     41static int
     42vxfs_immed_read_folio(struct file *fp, struct folio *folio)
     43{
     44	struct page *pp = &folio->page;
     45	struct vxfs_inode_info	*vip = VXFS_INO(pp->mapping->host);
     46	u_int64_t	offset = (u_int64_t)pp->index << PAGE_SHIFT;
     47	caddr_t		kaddr;
     48
     49	kaddr = kmap(pp);
     50	memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE);
     51	kunmap(pp);
     52	
     53	flush_dcache_page(pp);
     54	SetPageUptodate(pp);
     55        unlock_page(pp);
     56
     57	return 0;
     58}