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 (2832B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Ceph cache definitions.
      4 *
      5 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
      6 *  Written by Milosz Tanski (milosz@adfin.com)
      7 */
      8
      9#include <linux/ceph/ceph_debug.h>
     10
     11#include <linux/fs_context.h>
     12#include "super.h"
     13#include "cache.h"
     14
     15void ceph_fscache_register_inode_cookie(struct inode *inode)
     16{
     17	struct ceph_inode_info *ci = ceph_inode(inode);
     18	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
     19
     20	/* No caching for filesystem? */
     21	if (!fsc->fscache)
     22		return;
     23
     24	/* Regular files only */
     25	if (!S_ISREG(inode->i_mode))
     26		return;
     27
     28	/* Only new inodes! */
     29	if (!(inode->i_state & I_NEW))
     30		return;
     31
     32	WARN_ON_ONCE(ci->netfs.cache);
     33
     34	ci->netfs.cache =
     35		fscache_acquire_cookie(fsc->fscache, 0,
     36				       &ci->i_vino, sizeof(ci->i_vino),
     37				       &ci->i_version, sizeof(ci->i_version),
     38				       i_size_read(inode));
     39}
     40
     41void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
     42{
     43	fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
     44}
     45
     46void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
     47{
     48	struct ceph_inode_info *ci = ceph_inode(inode);
     49
     50	fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
     51}
     52
     53void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
     54{
     55	struct ceph_inode_info *ci = ceph_inode(inode);
     56
     57	if (update) {
     58		loff_t i_size = i_size_read(inode);
     59
     60		fscache_unuse_cookie(ceph_fscache_cookie(ci),
     61				     &ci->i_version, &i_size);
     62	} else {
     63		fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
     64	}
     65}
     66
     67void ceph_fscache_update(struct inode *inode)
     68{
     69	struct ceph_inode_info *ci = ceph_inode(inode);
     70	loff_t i_size = i_size_read(inode);
     71
     72	fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
     73}
     74
     75void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
     76{
     77	struct ceph_inode_info *ci = ceph_inode(inode);
     78
     79	fscache_invalidate(ceph_fscache_cookie(ci),
     80			   &ci->i_version, i_size_read(inode),
     81			   dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
     82}
     83
     84int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
     85{
     86	const struct ceph_fsid *fsid = &fsc->client->fsid;
     87	const char *fscache_uniq = fsc->mount_options->fscache_uniq;
     88	size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
     89	char *name;
     90	int err = 0;
     91
     92	name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
     93			 uniq_len ? fscache_uniq : "");
     94	if (!name)
     95		return -ENOMEM;
     96
     97	fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
     98	if (IS_ERR_OR_NULL(fsc->fscache)) {
     99		errorfc(fc, "Unable to register fscache cookie for %s", name);
    100		err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
    101		fsc->fscache = NULL;
    102	}
    103	kfree(name);
    104	return err;
    105}
    106
    107void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
    108{
    109	fscache_relinquish_volume(fsc->fscache, NULL, false);
    110}