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![Wu Fengguang](/assets/img/avatar_default.png)
Filesystem data/metadata present the most tricky-to-isolate pages. It requires careful code review and stress testing to get them right. The fs/device filter helps to target the stress tests to some specific filesystem pages. The filter condition is block device's major/minor numbers: - corrupt-filter-dev-major - corrupt-filter-dev-minor When specified (non -1), only page cache pages that belong to that device will be poisoned. The filters are checked reliably on the locked and refcounted page. Haicheng: clear PG_hwpoison and drop bad page count if filter not OK AK: Add documentation CC: Haicheng Li <haicheng.li@intel.com> CC: Nick Piggin <npiggin@suse.de> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* Inject a hwpoison memory failure on a arbitary pfn */
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include "internal.h"
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static struct dentry *hwpoison_dir;
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static int hwpoison_inject(void *data, u64 val)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val);
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return __memory_failure(val, 18, 0);
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}
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static int hwpoison_unpoison(void *data, u64 val)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return unpoison_memory(val);
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}
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DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
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DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
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static void pfn_inject_exit(void)
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{
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if (hwpoison_dir)
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debugfs_remove_recursive(hwpoison_dir);
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}
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static int pfn_inject_init(void)
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{
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struct dentry *dentry;
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hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
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if (hwpoison_dir == NULL)
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return -ENOMEM;
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/*
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* Note that the below poison/unpoison interfaces do not involve
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* hardware status change, hence do not require hardware support.
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* They are mainly for testing hwpoison in software level.
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*/
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dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
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NULL, &hwpoison_fops);
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if (!dentry)
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goto fail;
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dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir,
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NULL, &unpoison_fops);
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if (!dentry)
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goto fail;
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dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600,
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hwpoison_dir, &hwpoison_filter_dev_major);
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if (!dentry)
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goto fail;
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dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600,
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hwpoison_dir, &hwpoison_filter_dev_minor);
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if (!dentry)
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goto fail;
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return 0;
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fail:
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pfn_inject_exit();
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return -ENOMEM;
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}
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module_init(pfn_inject_init);
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module_exit(pfn_inject_exit);
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MODULE_LICENSE("GPL");
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