11f327613SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
260e78d2cSAbhishek Kulkarni /*
360e78d2cSAbhishek Kulkarni * V9FS cache definitions.
460e78d2cSAbhishek Kulkarni *
560e78d2cSAbhishek Kulkarni * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
660e78d2cSAbhishek Kulkarni */
760e78d2cSAbhishek Kulkarni
860e78d2cSAbhishek Kulkarni #include <linux/jiffies.h>
960e78d2cSAbhishek Kulkarni #include <linux/file.h>
105a0e3ad6STejun Heo #include <linux/slab.h>
1160e78d2cSAbhishek Kulkarni #include <linux/stat.h>
1260e78d2cSAbhishek Kulkarni #include <linux/sched.h>
1360e78d2cSAbhishek Kulkarni #include <linux/fs.h>
1460e78d2cSAbhishek Kulkarni #include <net/9p/9p.h>
1560e78d2cSAbhishek Kulkarni
1660e78d2cSAbhishek Kulkarni #include "v9fs.h"
1760e78d2cSAbhishek Kulkarni #include "cache.h"
1860e78d2cSAbhishek Kulkarni
v9fs_cache_session_get_cookie(struct v9fs_session_info * v9ses,const char * dev_name)1924e42e32SDavid Howells int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
2024e42e32SDavid Howells const char *dev_name)
2160e78d2cSAbhishek Kulkarni {
2224e42e32SDavid Howells struct fscache_volume *vcookie;
2324e42e32SDavid Howells char *name, *p;
2424e42e32SDavid Howells
2524e42e32SDavid Howells name = kasprintf(GFP_KERNEL, "9p,%s,%s",
2624e42e32SDavid Howells dev_name, v9ses->cachetag ?: v9ses->aname);
2724e42e32SDavid Howells if (!name)
2860e78d2cSAbhishek Kulkarni return -ENOMEM;
2960e78d2cSAbhishek Kulkarni
3024e42e32SDavid Howells for (p = name; *p; p++)
3124e42e32SDavid Howells if (*p == '/')
3224e42e32SDavid Howells *p = ';';
3324e42e32SDavid Howells
3424e42e32SDavid Howells vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
3524e42e32SDavid Howells p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
3624e42e32SDavid Howells v9ses, vcookie, name);
3724e42e32SDavid Howells if (IS_ERR(vcookie)) {
3824e42e32SDavid Howells if (vcookie != ERR_PTR(-EBUSY)) {
3924e42e32SDavid Howells kfree(name);
4024e42e32SDavid Howells return PTR_ERR(vcookie);
4160e78d2cSAbhishek Kulkarni }
4224e42e32SDavid Howells pr_err("Cache volume key already in use (%s)\n", name);
4324e42e32SDavid Howells vcookie = NULL;
44402cb8ddSDavid Howells }
4524e42e32SDavid Howells v9ses->fscache = vcookie;
4624e42e32SDavid Howells kfree(name);
4724e42e32SDavid Howells return 0;
48402cb8ddSDavid Howells }
4960e78d2cSAbhishek Kulkarni
v9fs_cache_inode_get_cookie(struct inode * inode)5060e78d2cSAbhishek Kulkarni void v9fs_cache_inode_get_cookie(struct inode *inode)
5160e78d2cSAbhishek Kulkarni {
52bc899ee1SDavid Howells struct v9fs_inode *v9inode = V9FS_I(inode);
5360e78d2cSAbhishek Kulkarni struct v9fs_session_info *v9ses;
5424e42e32SDavid Howells __le32 version;
5524e42e32SDavid Howells __le64 path;
5660e78d2cSAbhishek Kulkarni
5760e78d2cSAbhishek Kulkarni if (!S_ISREG(inode->i_mode))
5860e78d2cSAbhishek Kulkarni return;
59bc899ee1SDavid Howells if (WARN_ON(v9fs_inode_cookie(v9inode)))
6060e78d2cSAbhishek Kulkarni return;
6160e78d2cSAbhishek Kulkarni
6224e42e32SDavid Howells version = cpu_to_le32(v9inode->qid.version);
6324e42e32SDavid Howells path = cpu_to_le64(v9inode->qid.path);
6460e78d2cSAbhishek Kulkarni v9ses = v9fs_inode2v9ses(inode);
65874c8ca1SDavid Howells v9inode->netfs.cache =
6624e42e32SDavid Howells fscache_acquire_cookie(v9fs_session_cache(v9ses),
6724e42e32SDavid Howells 0,
6824e42e32SDavid Howells &path, sizeof(path),
6924e42e32SDavid Howells &version, sizeof(version),
70874c8ca1SDavid Howells i_size_read(&v9inode->netfs.inode));
71*b4fa966fSDavid Howells if (v9inode->netfs.cache)
72*b4fa966fSDavid Howells mapping_set_release_always(inode->i_mapping);
7360e78d2cSAbhishek Kulkarni
745d385153SJoe Perches p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
75bc899ee1SDavid Howells inode, v9fs_inode_cookie(v9inode));
7660e78d2cSAbhishek Kulkarni }
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