Btrfs: corruption hunt continues
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6c01046..bb13310 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -8,6 +8,17 @@
#include "disk-io.h"
#include "transaction.h"
+#define PATTERN 0xDEADBEEFUL
+static inline void check_pattern(struct buffer_head *buf)
+{
+ if (buf->b_private != (void *)PATTERN)
+ WARN_ON(1);
+}
+
+static inline void set_pattern(struct buffer_head *buf)
+{
+ buf->b_private = (void *)PATTERN;
+}
static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
{
@@ -51,8 +62,10 @@
} while (bh != head);
out_unlock:
unlock_page(page);
- if (ret)
+ if (ret) {
touch_buffer(ret);
+ check_pattern(ret);
+ }
page_cache_release(page);
return ret;
}
@@ -82,6 +95,7 @@
bh->b_bdev = root->fs_info->sb->s_bdev;
bh->b_blocknr = first_block;
set_buffer_mapped(bh);
+ set_pattern(bh);
}
if (bh->b_blocknr == blocknr) {
ret = bh;
@@ -225,6 +239,7 @@
if (!buffer_uptodate(bh))
goto fail;
csum_tree_block(root, bh, 1);
+ set_pattern(bh);
} else {
unlock_buffer(bh);
}
@@ -240,6 +255,7 @@
int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct buffer_head *buf)
{
+ WARN_ON(atomic_read(&buf->b_count) == 0);
mark_buffer_dirty(buf);
return 0;
}
@@ -247,6 +263,7 @@
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct buffer_head *buf)
{
+ WARN_ON(atomic_read(&buf->b_count) == 0);
clear_buffer_dirty(buf);
return 0;
}
@@ -431,6 +448,7 @@
void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
{
+ check_pattern(buf);
brelse(buf);
}