ext4: add WARN_ON to check the length of allocated blocks

In commit 921f266b: ext4: add self-testing infrastructure to do a
sanity check, some sanity checks were added in map_blocks to make sure
'retval == map->m_len'.

Enable these checks by default and report any assertion failures using
ext4_warning() and WARN_ON() since they can help us to figure out some
bugs that are otherwise hard to hit.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 18 insertions, 21 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ba33c67d6e48..dd32a2eacd0d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -555,14 +555,13 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
                 int ret;
                 unsigned long long status;
 
-#ifdef ES_AGGRESSIVE_TEST
-                if (retval != map->m_len) {
-                        printk("ES len assertion failed for inode: %lu "
-                               "retval %d != map->m_len %d "
-                               "in %s (lookup)\n", inode->i_ino, retval,
-                               map->m_len, __func__);
+                if (unlikely(retval != map->m_len)) {
+                        ext4_warning(inode->i_sb,
+                                     "ES len assertion failed for inode "
+                                     "%lu: retval %d != map->m_len %d",
+                                     inode->i_ino, retval, map->m_len);
+                        WARN_ON(1);
                 }
-#endif
 
                 status = map->m_flags & EXT4_MAP_UNWRITTEN ?
                                 EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
@@ -656,14 +655,13 @@ found:
                 int ret;
                 unsigned long long status;
 
-#ifdef ES_AGGRESSIVE_TEST
-                if (retval != map->m_len) {
-                        printk("ES len assertion failed for inode: %lu "
-                               "retval %d != map->m_len %d "
-                               "in %s (allocation)\n", inode->i_ino, retval,
-                               map->m_len, __func__);
+                if (unlikely(retval != map->m_len)) {
+                        ext4_warning(inode->i_sb,
+                                     "ES len assertion failed for inode "
+                                     "%lu: retval %d != map->m_len %d",
+                                     inode->i_ino, retval, map->m_len);
+                        WARN_ON(1);
                 }
-#endif
 
                 /*
                  * If the extent has been zeroed out, we don't need to update
@@ -1637,14 +1635,13 @@ add_delayed:
                 int ret;
                 unsigned long long status;
 
-#ifdef ES_AGGRESSIVE_TEST
-                if (retval != map->m_len) {
-                        printk("ES len assertion failed for inode: %lu "
-                               "retval %d != map->m_len %d "
-                               "in %s (lookup)\n", inode->i_ino, retval,
-                               map->m_len, __func__);
+                if (unlikely(retval != map->m_len)) {
+                        ext4_warning(inode->i_sb,
+                                     "ES len assertion failed for inode "
+                                     "%lu: retval %d != map->m_len %d",
+                                     inode->i_ino, retval, map->m_len);
+                        WARN_ON(1);
                 }
-#endif
 
                 status = map->m_flags & EXT4_MAP_UNWRITTEN ?
                                 EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;