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1// SPDX-License-Identifier: GPL-2.0-only2/*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