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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
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Network filesystem caching backend to use cache files on a premounted
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* filesystem
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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/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/completion.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/statfs.h>
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#include <linux/sysctl.h>
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#include <linux/miscdevice.h>
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#include <linux/netfs.h>
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#include <trace/events/netfs.h>
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#define CREATE_TRACE_POINTS
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#include "internal.h"
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unsigned cachefiles_debug;
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module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
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MODULE_DESCRIPTION("Mounted-filesystem based cache");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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/*
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* initialise the fs caching module
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*/
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static int __init cachefiles_init(void)
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{
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int ret;
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ret = cachefiles_register_error_injection();
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if (ret < 0)
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goto error_einj;
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pr_info("Loaded\n");
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return 0;
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error_einj:
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pr_err("failed to register: %d\n", ret);
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return ret;
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}
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fs_initcall(cachefiles_init);
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/*
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* clean up on module removal
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*/
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static void __exit cachefiles_exit(void)
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{
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pr_info("Unloading\n");
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cachefiles_unregister_error_injection();
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}
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module_exit(cachefiles_exit);
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