brintos

brintos / linux-shallow public Read only

0
0
Text · 1.8 KiB · 12c0ae2 Raw
77 lines · c
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