// SPDX-License-Identifier: GPL-2.0-only/* * Ceph cache definitions. * *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. *  Written by Milosz Tanski (milosz@adfin.com) */ #include <linux/ceph/ceph_debug.h> #include <linux/fs_context.h>#include "super.h"#include "cache.h" void ceph_fscache_register_inode_cookie(struct inode *inode){	struct ceph_inode_info *ci = ceph_inode(inode);	struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 	/* No caching for filesystem? */	if (!fsc->fscache)		return; 	/* Regular files only */	if (!S_ISREG(inode->i_mode))		return; 	/* Only new inodes! */	if (!(inode->i_state & I_NEW))		return; 	WARN_ON_ONCE(ci->netfs.cache); 	ci->netfs.cache =		fscache_acquire_cookie(fsc->fscache, 0,				       &ci->i_vino, sizeof(ci->i_vino),				       &ci->i_version, sizeof(ci->i_version),				       i_size_read(inode));	if (ci->netfs.cache)		mapping_set_release_always(inode->i_mapping);} void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci){	fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);} void ceph_fscache_use_cookie(struct inode *inode, bool will_modify){	struct ceph_inode_info *ci = ceph_inode(inode); 	fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);} void ceph_fscache_unuse_cookie(struct inode *inode, bool update){	struct ceph_inode_info *ci = ceph_inode(inode); 	if (update) {		loff_t i_size = i_size_read(inode); 		fscache_unuse_cookie(ceph_fscache_cookie(ci),				     &ci->i_version, &i_size);	} else {		fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);	}} void ceph_fscache_update(struct inode *inode){	struct ceph_inode_info *ci = ceph_inode(inode);	loff_t i_size = i_size_read(inode); 	fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);} void ceph_fscache_invalidate(struct inode *inode, bool dio_write){	struct ceph_inode_info *ci = ceph_inode(inode); 	fscache_invalidate(ceph_fscache_cookie(ci),			   &ci->i_version, i_size_read(inode),			   dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);} int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc){	const struct ceph_fsid *fsid = &fsc->client->fsid;	const char *fscache_uniq = fsc->mount_options->fscache_uniq;	size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;	char *name;	int err = 0; 	name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",			 uniq_len ? fscache_uniq : "");	if (!name)		return -ENOMEM; 	fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);	if (IS_ERR_OR_NULL(fsc->fscache)) {		errorfc(fc, "Unable to register fscache cookie for %s", name);		err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;		fsc->fscache = NULL;	}	kfree(name);	return err;} void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc){	fscache_relinquish_volume(fsc->fscache, NULL, false);}