cregit-Linux how code gets into the kernel

Release 4.10 fs/fscache/netfs.c

Directory: fs/fscache
/* FS-Cache netfs (client) registration
 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.

#include <linux/module.h>
#include <linux/slab.h>
#include "internal.h"

static LIST_HEAD(fscache_netfs_list);

 * register a network filesystem for caching

int __fscache_register_netfs(struct fscache_netfs *netfs) { struct fscache_netfs *ptr; struct fscache_cookie *cookie; int ret; _enter("{%s}", netfs->name); INIT_LIST_HEAD(&netfs->link); /* allocate a cookie for the primary index */ cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL); if (!cookie) { _leave(" = -ENOMEM"); return -ENOMEM; } /* initialise the primary index cookie */ atomic_set(&cookie->usage, 1); atomic_set(&cookie->n_children, 0); atomic_set(&cookie->n_active, 1); cookie->def = &fscache_fsdef_netfs_def; cookie->parent = &fscache_fsdef_index; cookie->netfs_data = netfs; cookie->flags = 1 << FSCACHE_COOKIE_ENABLED; spin_lock_init(&cookie->lock); spin_lock_init(&cookie->stores_lock); INIT_HLIST_HEAD(&cookie->backing_objects); /* check the netfs type is not already present */ down_write(&fscache_addremove_sem); ret = -EEXIST; list_for_each_entry(ptr, &fscache_netfs_list, link) { if (strcmp(ptr->name, netfs->name) == 0) goto already_registered; } atomic_inc(&cookie->parent->usage); atomic_inc(&cookie->parent->n_children); netfs->primary_index = cookie; list_add(&netfs->link, &fscache_netfs_list); ret = 0; pr_notice("Netfs '%s' registered for caching\n", netfs->name); already_registered: up_write(&fscache_addremove_sem); if (ret < 0) kmem_cache_free(fscache_cookie_jar, cookie); _leave(" = %d", ret); return ret; }


david howellsdavid howells22282.22%457.14%
kinglong meekinglong mee4617.04%228.57%
fabian frederickfabian frederick20.74%114.29%

EXPORT_SYMBOL(__fscache_register_netfs); /* * unregister a network filesystem from the cache * - all cookies must have been released first */
void __fscache_unregister_netfs(struct fscache_netfs *netfs) { _enter("{%s.%u}", netfs->name, netfs->version); down_write(&fscache_addremove_sem); list_del(&netfs->link); fscache_relinquish_cookie(netfs->primary_index, 0); up_write(&fscache_addremove_sem); pr_notice("Netfs '%s' unregistered from caching\n", netfs->name); _leave(""); }


david howellsdavid howells6496.97%150.00%
fabian frederickfabian frederick23.03%150.00%


Overall Contributors

david howellsdavid howells31886.41%457.14%
kinglong meekinglong mee4612.50%228.57%
fabian frederickfabian frederick41.09%114.29%
Directory: fs/fscache
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