linux-ext4 - [PATCH v2] ext4: add WARN_ON to check the length of allocated blocks

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Message-Id: <1373590852-29544-1-git-send-email-wenqing.lz@taobao.com>
Date:	Fri, 12 Jul 2013 09:00:52 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	"Theodore Ts'o" <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH v2] ext4: add WARN_ON to check the length of allocated blocks

From: Zheng Liu <wenqing.lz@...bao.com>

In this commit (921f266b) a sanity check is added in map_blocks to make
sure 'retval == map->m_len'.  But we'd better enable this check all the
time because it can help us to dig some bugs that is hard to be hitted.

Cc: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
changelog:
v2 <- v1:
 * print more details to help us to dig some bugs that is hard to be hitted

v1: http://patchwork.ozlabs.org/patch/230406/

Hi Ted,

This patch sleeps on my own tree for a very long time so that I almost forgot
it.  Sorry about that.

						- Zheng

 fs/ext4/inode.c |   39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 19a1643..95bad70 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -556,14 +556,13 @@ 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 assertation 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 assertation failed for inode: "
+				     "%lu retval %d != map->m_len %d\n",
+				     inode->i_ino, retval, map->m_len);
+			WARN_ON(1);
 		}
-#endif
 
 		status = map->m_flags & EXT4_MAP_UNWRITTEN ?
 				EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
@@ -657,14 +656,13 @@ found:
 		int ret;
 		unsigned long long status;
 
-#ifdef ES_AGGRESSIVE_TEST
-		if (retval != map->m_len) {
-			printk("ES len assertation 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 assertation failed for inode: "
+				     "%lu retval %d != map->m_len %d\n",
+				     inode->i_ino, retval, map->m_len);
+			WARN_ON(1);
 		}
-#endif
 
 		/*
 		 * If the extent has been zeroed out, we don't need to update
@@ -1640,14 +1638,13 @@ add_delayed:
 		int ret;
 		unsigned long long status;
 
-#ifdef ES_AGGRESSIVE_TEST
-		if (retval != map->m_len) {
-			printk("ES len assertation 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 assertation failed for inode: "
+				     "%lu retval %d != map->m_len %d\n",
+				     inode->i_ino, retval, map->m_len);
+			WARN_ON(1);
 		}
-#endif
 
 		status = map->m_flags & EXT4_MAP_UNWRITTEN ?
 				EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
-- 
1.7.9.7

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