75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
// 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_ctx.cache =
|
|
fscache_acquire_cookie(v9fs_session_cache(v9ses),
|
|
0,
|
|
&path, sizeof(path),
|
|
&version, sizeof(version),
|
|
i_size_read(&v9inode->vfs_inode));
|
|
|
|
p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
|
|
inode, v9fs_inode_cookie(v9inode));
|
|
}
|