[PATCH 24/24] HWPOISON: show corrupted file info

[Wu Fengguang]

If file data is corrupted, the user may want to know which file
is corrupted.

CC: Andi Kleen <andi@xxxxxxxxxxxxxx> 
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 mm/memory-failure.c |   43 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

--- linux-mm.orig/mm/memory-failure.c	2009-12-01 09:56:21.000000000 +0800
+++ linux-mm/mm/memory-failure.c	2009-12-01 09:56:23.000000000 +0800
@@ -56,6 +56,47 @@ u64 hwpoison_filter_flags_mask;
 u64 hwpoison_filter_flags_value;
 u32 hwpoison_filter_memcg;
 
+static void describe_page_file(struct page *page)
+{
+	char *name = "?";
+	struct inode *inode;
+	struct dentry *dentry;
+
+	if (PageAnon(page))
+		return;
+
+	if (!page->mapping)
+		return;
+
+	inode = igrab(page->mapping->host);
+	if (!inode)
+		return;
+
+	dentry = d_find_alias(inode);
+
+	if (dentry) {
+		spin_lock(&dentry->d_lock);
+		name = dentry->d_name.name;
+	}
+
+	printk(KERN_ERR
+	       "MCE %#lx: dev %d:%d inode %lu(%s) pgoff %lu%s\n",
+	       page_to_pfn(page),
+	       MAJOR(inode->i_sb->s_dev),
+	       MINOR(inode->i_sb->s_dev),
+	       inode->i_ino,
+	       name,
+	       page->index,
+	       PageDirty(page) ? " corrupted" : "");
+
+	if (dentry) {
+		spin_unlock(&dentry->d_lock);
+		dput(dentry);
+	}
+
+	iput(inode);
+}
+
 static int hwpoison_filter_dev(struct page *p)
 {
 	struct address_space *mapping;
@@ -525,6 +566,8 @@ static int me_pagecache_clean(struct hwp
 		} else {
 			ret = RECOVERED;
 		}
+		if (PageDirty(p) && !PageSwapBacked(p))
+			describe_page_file(p);
 	} else {
 		/*
 		 * If the file system doesn't support it just invalidate


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