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a70f652626
Add support for injecting ENOSPC or EIO errors. This needs to be enabled
by CONFIG_CACHEFILES_ERROR_INJECTION=y. Once enabled, ENOSPC on things
like write and mkdir can be triggered by:
echo 1 >/proc/sys/cachefiles/error_injection
and EIO can be triggered on most operations by:
echo 2 >/proc/sys/cachefiles/error_injection
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819624706.215744.6911916249119962943.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906925343.143852.5465695512984025812.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967134412.1823006.7354285948280296595.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021532340.640689.18209494225772443698.stgit@warthog.procyon.org.uk/ # v4
47 lines
992 B
C
47 lines
992 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Error injection handling.
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*
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* Copyright (C) 2021 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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#include <linux/sysctl.h>
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#include "internal.h"
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unsigned int cachefiles_error_injection_state;
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static struct ctl_table_header *cachefiles_sysctl;
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static struct ctl_table cachefiles_sysctls[] = {
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{
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.procname = "error_injection",
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.data = &cachefiles_error_injection_state,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_douintvec,
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},
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{}
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};
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static struct ctl_table cachefiles_sysctls_root[] = {
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{
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.procname = "cachefiles",
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.mode = 0555,
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.child = cachefiles_sysctls,
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},
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{}
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};
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int __init cachefiles_register_error_injection(void)
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{
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cachefiles_sysctl = register_sysctl_table(cachefiles_sysctls_root);
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if (!cachefiles_sysctl)
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return -ENOMEM;
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return 0;
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}
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void cachefiles_unregister_error_injection(void)
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{
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unregister_sysctl_table(cachefiles_sysctl);
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}
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