Ext4 has its own configurable error handling policy, so it's helpful
if we can use it also in the context of memory error handling.
With this patch, when we detect a memory error on a dirty pagecache in
ext4 filesystem, we can allow users to choose to trigger kernel panic
to avoid consuming corrupted data.
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
fs/ext4/inode.c | 35 +++++++++++++++++++++++++++++++----
1 file changed, 31 insertions(+), 4 deletions(-)
diff --git v3.7-rc2.orig/fs/ext4/inode.c v3.7-rc2/fs/ext4/inode.c
index b3c243b..513badb 100644
--- v3.7-rc2.orig/fs/ext4/inode.c
+++ v3.7-rc2/fs/ext4/inode.c
@@ -3163,6 +3163,33 @@ static int ext4_journalled_set_page_dirty(struct page *page)
return __set_page_dirty_nobuffers(page);
}
+static int ext4_error_remove_page(struct address_space *mapping,
+ struct page *page)
+{
+ struct inode *inode = mapping->host;
+ struct buffer_head *bh, *head;
+ ext4_fsblk_t block;
+
+ if (!PageDirty(page) || !page_has_buffers(page))
+ goto remove_page;
+
+ /* Lost data. Handle as critical fs error. */
+ bh = head = page_buffers(page);
+ do {
+ if (buffer_dirty(bh) && !buffer_delay(bh)) {
+ block = bh->b_blocknr;
+ EXT4_ERROR_INODE_BLOCK(inode, block,
+ "Removing dirty pagecache page");
+ } else
+ EXT4_ERROR_INODE(inode,
+ "Removing dirty pagecache page");
+ bh = bh->b_this_page;
+ } while (bh != head);
+
+remove_page:
+ return generic_error_remove_page(mapping, page);
+}
+
static const struct address_space_operations ext4_ordered_aops = {
.readpage = ext4_readpage,
.readpages = ext4_readpages,
@@ -3175,7 +3202,7 @@ static const struct address_space_operations ext4_ordered_aops = {
.direct_IO = ext4_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
+ .error_remove_page = ext4_error_remove_page,
};
static const struct address_space_operations ext4_writeback_aops = {
@@ -3190,7 +3217,7 @@ static const struct address_space_operations ext4_writeback_aops = {
.direct_IO = ext4_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
+ .error_remove_page = ext4_error_remove_page,
};
static const struct address_space_operations ext4_journalled_aops = {
@@ -3205,7 +3232,7 @@ static const struct address_space_operations ext4_journalled_aops = {
.releasepage = ext4_releasepage,
.direct_IO = ext4_direct_IO,
.is_partially_uptodate = block_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
+ .error_remove_page = ext4_error_remove_page,
};
static const struct address_space_operations ext4_da_aops = {
@@ -3221,7 +3248,7 @@ static const struct address_space_operations ext4_da_aops = {
.direct_IO = ext4_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
+ .error_remove_page = ext4_error_remove_page,
};
void ext4_set_aops(struct inode *inode)
--
1.7.11.7
--
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