[PATCH 2/2 v2] mm: print out information of file affected by memory error

Naoya Horiguchi
2012-11-02T16:33:46Z

Printing out the information about which file can be affected by a
memory error in generic_error_remove_page() is helpful for user to
estimate the impact of the error.

Changelog v2:
- dereference mapping->host after if (!mapping) check for robustness

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Jan Kara <jack@suse.cz>
---
mm/truncate.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git v3.7-rc3.orig/mm/truncate.c v3.7-rc3/mm/truncate.c
index d51ce92..db1b216 100644
--- v3.7-rc3.orig/mm/truncate.c
+++ v3.7-rc3/mm/truncate.c
@@ -151,14 +151,20 @@ int truncate_inode_page(struct address_space *mapping, struct page *page)
*/
int generic_error_remove_page(struct address_space *mapping, struct page *page)
{
+ struct inode *inode;
+
if (!mapping)
return -EINVAL;
+ inode = mapping->host;
/*
* Only punch for normal data pages for now.
* Handling other types like directories would need more auditing.
*/
- if (!S_ISREG(mapping->host->i_mode))
+ if (!S_ISREG(inode->i_mode))
return -EIO;
+ pr_info("MCE %#lx: file info pgoff:%lu, inode:%lu, dev:%s\n",
+ page_to_pfn(page), page_index(page),
+ inode->i_ino, inode->i_sb->s_id);
return truncate_inode_page(mapping, page);
}
EXPORT_SYMBOL(generic_error_remove_page);
--
1.7.11.7