// SPDX-License-Identifier: GPL-2.0-only/* * V9FS cache definitions. * *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu> */ #include <linux/jiffies.h>#include <linux/file.h>#include <linux/slab.h>#include <linux/stat.h>#include <linux/sched.h>#include <linux/fs.h>#include <net/9p/9p.h> #include "v9fs.h"#include "cache.h" int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,				  const char *dev_name){	struct fscache_volume *vcookie;	char *name, *p; 	name = kasprintf(GFP_KERNEL, "9p,%s,%s",			 dev_name, v9ses->cachetag ?: v9ses->aname);	if (!name)		return -ENOMEM; 	for (p = name; *p; p++)		if (*p == '/')			*p = ';'; 	vcookie = fscache_acquire_volume(name, NULL, NULL, 0);	p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",		 v9ses, vcookie, name);	if (IS_ERR(vcookie)) {		if (vcookie != ERR_PTR(-EBUSY)) {			kfree(name);			return PTR_ERR(vcookie);		}		pr_err("Cache volume key already in use (%s)\n", name);		vcookie = NULL;	}	v9ses->fscache = vcookie;	kfree(name);	return 0;} void v9fs_cache_inode_get_cookie(struct inode *inode){	struct v9fs_inode *v9inode = V9FS_I(inode);	struct v9fs_session_info *v9ses;	__le32 version;	__le64 path; 	if (!S_ISREG(inode->i_mode))		return;	if (WARN_ON(v9fs_inode_cookie(v9inode)))		return; 	version = cpu_to_le32(v9inode->qid.version);	path = cpu_to_le64(v9inode->qid.path);	v9ses = v9fs_inode2v9ses(inode);	v9inode->netfs.cache =		fscache_acquire_cookie(v9fs_session_cache(v9ses),				       0,				       &path, sizeof(path),				       &version, sizeof(version),				       i_size_read(&v9inode->netfs.inode));	if (v9inode->netfs.cache)		mapping_set_release_always(inode->i_mapping); 	p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",		 inode, v9fs_inode_cookie(v9inode));}