b4d0d230cc
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 114 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.552531963@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* FS-Cache netfs (client) registration
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*
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* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define FSCACHE_DEBUG_LEVEL COOKIE
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "internal.h"
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/*
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* register a network filesystem for caching
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*/
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int __fscache_register_netfs(struct fscache_netfs *netfs)
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{
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struct fscache_cookie *candidate, *cookie;
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_enter("{%s}", netfs->name);
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/* allocate a cookie for the primary index */
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candidate = fscache_alloc_cookie(&fscache_fsdef_index,
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&fscache_fsdef_netfs_def,
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netfs->name, strlen(netfs->name),
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&netfs->version, sizeof(netfs->version),
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netfs, 0);
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if (!candidate) {
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_leave(" = -ENOMEM");
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return -ENOMEM;
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}
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candidate->flags = 1 << FSCACHE_COOKIE_ENABLED;
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/* check the netfs type is not already present */
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cookie = fscache_hash_cookie(candidate);
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if (!cookie)
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goto already_registered;
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if (cookie != candidate) {
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trace_fscache_cookie(candidate, fscache_cookie_discard, 1);
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fscache_free_cookie(candidate);
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}
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fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs);
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atomic_inc(&cookie->parent->n_children);
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netfs->primary_index = cookie;
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pr_notice("Netfs '%s' registered for caching\n", netfs->name);
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trace_fscache_netfs(netfs);
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_leave(" = 0");
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return 0;
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already_registered:
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fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs);
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_leave(" = -EEXIST");
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return -EEXIST;
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}
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EXPORT_SYMBOL(__fscache_register_netfs);
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/*
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* unregister a network filesystem from the cache
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* - all cookies must have been released first
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*/
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void __fscache_unregister_netfs(struct fscache_netfs *netfs)
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{
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_enter("{%s.%u}", netfs->name, netfs->version);
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fscache_relinquish_cookie(netfs->primary_index, NULL, false);
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pr_notice("Netfs '%s' unregistered from caching\n", netfs->name);
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_leave("");
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}
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EXPORT_SYMBOL(__fscache_unregister_netfs);
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