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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cache.c (1745B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * V9FS cache definitions.
      4 *
      5 *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
      6 */
      7
      8#include <linux/jiffies.h>
      9#include <linux/file.h>
     10#include <linux/slab.h>
     11#include <linux/stat.h>
     12#include <linux/sched.h>
     13#include <linux/fs.h>
     14#include <net/9p/9p.h>
     15
     16#include "v9fs.h"
     17#include "cache.h"
     18
     19int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
     20				  const char *dev_name)
     21{
     22	struct fscache_volume *vcookie;
     23	char *name, *p;
     24
     25	name = kasprintf(GFP_KERNEL, "9p,%s,%s",
     26			 dev_name, v9ses->cachetag ?: v9ses->aname);
     27	if (!name)
     28		return -ENOMEM;
     29
     30	for (p = name; *p; p++)
     31		if (*p == '/')
     32			*p = ';';
     33
     34	vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
     35	p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
     36		 v9ses, vcookie, name);
     37	if (IS_ERR(vcookie)) {
     38		if (vcookie != ERR_PTR(-EBUSY)) {
     39			kfree(name);
     40			return PTR_ERR(vcookie);
     41		}
     42		pr_err("Cache volume key already in use (%s)\n", name);
     43		vcookie = NULL;
     44	}
     45	v9ses->fscache = vcookie;
     46	kfree(name);
     47	return 0;
     48}
     49
     50void v9fs_cache_inode_get_cookie(struct inode *inode)
     51{
     52	struct v9fs_inode *v9inode = V9FS_I(inode);
     53	struct v9fs_session_info *v9ses;
     54	__le32 version;
     55	__le64 path;
     56
     57	if (!S_ISREG(inode->i_mode))
     58		return;
     59	if (WARN_ON(v9fs_inode_cookie(v9inode)))
     60		return;
     61
     62	version = cpu_to_le32(v9inode->qid.version);
     63	path = cpu_to_le64(v9inode->qid.path);
     64	v9ses = v9fs_inode2v9ses(inode);
     65	v9inode->netfs.cache =
     66		fscache_acquire_cookie(v9fs_session_cache(v9ses),
     67				       0,
     68				       &path, sizeof(path),
     69				       &version, sizeof(version),
     70				       i_size_read(&v9inode->netfs.inode));
     71
     72	p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
     73		 inode, v9fs_inode_cookie(v9inode));
     74}