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74 lines
1.9 KiB
74 lines
1.9 KiB
// 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 ([email protected]) |
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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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