mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
HWPOISON: add fs/device filters
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>
This commit is contained in:
parent
138ce286eb
commit
7c116f2b0d
4 changed files with 72 additions and 0 deletions
|
@ -115,6 +115,13 @@ memory failures.
|
|||
Note these injection interfaces are not stable and might change between
|
||||
kernel versions
|
||||
|
||||
corrupt-filter-dev-major
|
||||
corrupt-filter-dev-minor
|
||||
|
||||
Only handle memory failures to pages associated with the file system defined
|
||||
by block device major/minor. -1U is the wildcard value.
|
||||
This should be only used for testing with artificial injection.
|
||||
|
||||
Architecture specific MCE injector
|
||||
|
||||
x86 has mce-inject, mce-test
|
||||
|
|
|
@ -3,6 +3,7 @@
|
|||
#include <linux/debugfs.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
#include "internal.h"
|
||||
|
||||
static struct dentry *hwpoison_dir;
|
||||
|
||||
|
@ -54,6 +55,16 @@ static int pfn_inject_init(void)
|
|||
if (!dentry)
|
||||
goto fail;
|
||||
|
||||
dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600,
|
||||
hwpoison_dir, &hwpoison_filter_dev_major);
|
||||
if (!dentry)
|
||||
goto fail;
|
||||
|
||||
dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600,
|
||||
hwpoison_dir, &hwpoison_filter_dev_minor);
|
||||
if (!dentry)
|
||||
goto fail;
|
||||
|
||||
return 0;
|
||||
fail:
|
||||
pfn_inject_exit();
|
||||
|
|
|
@ -250,3 +250,6 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
|
|||
#define ZONE_RECLAIM_SOME 0
|
||||
#define ZONE_RECLAIM_SUCCESS 1
|
||||
#endif
|
||||
|
||||
extern u32 hwpoison_filter_dev_major;
|
||||
extern u32 hwpoison_filter_dev_minor;
|
||||
|
|
|
@ -48,6 +48,50 @@ int sysctl_memory_failure_recovery __read_mostly = 1;
|
|||
|
||||
atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0);
|
||||
|
||||
u32 hwpoison_filter_dev_major = ~0U;
|
||||
u32 hwpoison_filter_dev_minor = ~0U;
|
||||
EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major);
|
||||
EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor);
|
||||
|
||||
static int hwpoison_filter_dev(struct page *p)
|
||||
{
|
||||
struct address_space *mapping;
|
||||
dev_t dev;
|
||||
|
||||
if (hwpoison_filter_dev_major == ~0U &&
|
||||
hwpoison_filter_dev_minor == ~0U)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* page_mapping() does not accept slab page
|
||||
*/
|
||||
if (PageSlab(p))
|
||||
return -EINVAL;
|
||||
|
||||
mapping = page_mapping(p);
|
||||
if (mapping == NULL || mapping->host == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
dev = mapping->host->i_sb->s_dev;
|
||||
if (hwpoison_filter_dev_major != ~0U &&
|
||||
hwpoison_filter_dev_major != MAJOR(dev))
|
||||
return -EINVAL;
|
||||
if (hwpoison_filter_dev_minor != ~0U &&
|
||||
hwpoison_filter_dev_minor != MINOR(dev))
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int hwpoison_filter(struct page *p)
|
||||
{
|
||||
if (hwpoison_filter_dev(p))
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(hwpoison_filter);
|
||||
|
||||
/*
|
||||
* Send all the processes who have the page mapped an ``action optional''
|
||||
* signal.
|
||||
|
@ -843,6 +887,13 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
|
|||
res = 0;
|
||||
goto out;
|
||||
}
|
||||
if (hwpoison_filter(p)) {
|
||||
if (TestClearPageHWPoison(p))
|
||||
atomic_long_dec(&mce_bad_pages);
|
||||
unlock_page(p);
|
||||
put_page(p);
|
||||
return 0;
|
||||
}
|
||||
|
||||
wait_on_page_writeback(p);
|
||||
|
||||
|
|
Loading…
Reference in a new issue