From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- fs/fscache/netfs.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 fs/fscache/netfs.c (limited to 'fs/fscache/netfs.c') diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c new file mode 100644 index 000000000..c2f605483 --- /dev/null +++ b/fs/fscache/netfs.c @@ -0,0 +1,78 @@ +/* FS-Cache netfs (client) registration + * + * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * 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. + */ + +#define FSCACHE_DEBUG_LEVEL COOKIE +#include +#include +#include "internal.h" + +/* + * register a network filesystem for caching + */ +int __fscache_register_netfs(struct fscache_netfs *netfs) +{ + struct fscache_cookie *candidate, *cookie; + + _enter("{%s}", netfs->name); + + /* allocate a cookie for the primary index */ + candidate = fscache_alloc_cookie(&fscache_fsdef_index, + &fscache_fsdef_netfs_def, + netfs->name, strlen(netfs->name), + &netfs->version, sizeof(netfs->version), + netfs, 0); + if (!candidate) { + _leave(" = -ENOMEM"); + return -ENOMEM; + } + + candidate->flags = 1 << FSCACHE_COOKIE_ENABLED; + + /* check the netfs type is not already present */ + cookie = fscache_hash_cookie(candidate); + if (!cookie) + goto already_registered; + if (cookie != candidate) { + trace_fscache_cookie(candidate, fscache_cookie_discard, 1); + fscache_free_cookie(candidate); + } + + fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs); + atomic_inc(&cookie->parent->n_children); + + netfs->primary_index = cookie; + + pr_notice("Netfs '%s' registered for caching\n", netfs->name); + trace_fscache_netfs(netfs); + _leave(" = 0"); + return 0; + +already_registered: + fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs); + _leave(" = -EEXIST"); + return -EEXIST; +} +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); + + fscache_relinquish_cookie(netfs->primary_index, NULL, false); + pr_notice("Netfs '%s' unregistered from caching\n", netfs->name); + + _leave(""); +} +EXPORT_SYMBOL(__fscache_unregister_netfs); -- cgit v1.2.3