btrfs: tree-checker: Fix false panic for sanity test

[BUG]
If we run btrfs with CONFIG_BTRFS_FS_RUN_SANITY_TESTS=y, it will
instantly cause kernel panic like:

------
...
assertion failed: 0, file: fs/btrfs/disk-io.c, line: 3853
...
Call Trace:
 btrfs_mark_buffer_dirty+0x187/0x1f0 [btrfs]
 setup_items_for_insert+0x385/0x650 [btrfs]
 __btrfs_drop_extents+0x129a/0x1870 [btrfs]
...
-----

[Cause]
Btrfs will call btrfs_check_leaf() in btrfs_mark_buffer_dirty() to check
if the leaf is valid with CONFIG_BTRFS_FS_RUN_SANITY_TESTS=y.

However quite some btrfs_mark_buffer_dirty() callers(*) don't really
initialize its item data but only initialize its item pointers, leaving
item data uninitialized.

This makes tree-checker catch uninitialized data as error, causing
such panic.

*: These callers include but not limited to
setup_items_for_insert()
btrfs_split_item()
btrfs_expand_item()

[Fix]
Add a new parameter @check_item_data to btrfs_check_leaf().
With @check_item_data set to false, item data check will be skipped and
fallback to old btrfs_check_leaf() behavior.

So we can still get early warning if we screw up item pointers, and
avoid false panic.

Cc: Filipe Manana <fdmanana@gmail.com>
Reported-by: Lakshmipathi.G <lakshmipathi.g@gmail.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

3 files changed, 43 insertions, 8 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index efce9a2fa9be..10a2a579cc7f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -610,7 +610,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
          * that we don't try and read the other copies of this block, just
          * return -EIO.
          */
-        if (found_level == 0 && btrfs_check_leaf(root, eb)) {
+        if (found_level == 0 && btrfs_check_leaf_full(root, eb)) {
                 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
                 ret = -EIO;
         }
@@ -3848,7 +3848,13 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
                                          buf->len,
                                          fs_info->dirty_metadata_batch);
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
-        if (btrfs_header_level(buf) == 0 && btrfs_check_leaf(root, buf)) {
+        /*
+         * Since btrfs_mark_buffer_dirty() can be called with item pointer set
+         * but item data not updated.
+         * So here we should only check item pointers, not item data.
+         */
+        if (btrfs_header_level(buf) == 0 &&
+            btrfs_check_leaf_relaxed(root, buf)) {
                 btrfs_print_leaf(buf);
                 ASSERT(0);
         }
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 114fc5f0ecc5..ce4ed6ec8f39 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -242,7 +242,8 @@ static int check_leaf_item(struct btrfs_root *root,
         return ret;
 }
 
-int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf)
+static int check_leaf(struct btrfs_root *root, struct extent_buffer *leaf,
+                      bool check_item_data)
 {
         struct btrfs_fs_info *fs_info = root->fs_info;
         /* No valid key type is 0, so all key should be larger than this key */
@@ -361,10 +362,15 @@ int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf)
                         return -EUCLEAN;
                 }
 
-                /* Check if the item size and content meet other criteria */
-                ret = check_leaf_item(root, leaf, &key, slot);
-                if (ret < 0)
-                        return ret;
+                if (check_item_data) {
+                        /*
+                         * Check if the item size and content meet other
+                         * criteria
+                         */
+                        ret = check_leaf_item(root, leaf, &key, slot);
+                        if (ret < 0)
+                                return ret;
+                }
 
                 prev_key.objectid = key.objectid;
                 prev_key.type = key.type;
@@ -374,6 +380,17 @@ int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf)
         return 0;
 }
 
+int btrfs_check_leaf_full(struct btrfs_root *root, struct extent_buffer *leaf)
+{
+        return check_leaf(root, leaf, true);
+}
+
+int btrfs_check_leaf_relaxed(struct btrfs_root *root,
+                             struct extent_buffer *leaf)
+{
+        return check_leaf(root, leaf, false);
+}
+
 int btrfs_check_node(struct btrfs_root *root, struct extent_buffer *node)
 {
         unsigned long nr = btrfs_header_nritems(node);
diff --git a/fs/btrfs/tree-checker.h b/fs/btrfs/tree-checker.h
index 96c486e95d70..3d53e8d6fda0 100644
--- a/fs/btrfs/tree-checker.h
+++ b/fs/btrfs/tree-checker.h
@@ -20,7 +20,19 @@
 #include "ctree.h"
 #include "extent_io.h"
 
-int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf);
+/*
+ * Comprehensive leaf checker.
+ * Will check not only the item pointers, but also every possible member
+ * in item data.
+ */
+int btrfs_check_leaf_full(struct btrfs_root *root, struct extent_buffer *leaf);
+
+/*
+ * Less strict leaf checker.
+ * Will only check item pointers, not reading item data.
+ */
+int btrfs_check_leaf_relaxed(struct btrfs_root *root,
+                             struct extent_buffer *leaf);
 int btrfs_check_node(struct btrfs_root *root, struct extent_buffer *node);
 
 #endif