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}