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	if (v9inode->netfs.cache)
72		mapping_set_release_always(inode->i_mapping);
73
74	p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
75		 inode, v9fs_inode_cookie(v9inode));
76}
77