linux-ext4 - [PATCH v2] ext4: lost matching-pair of trace in ext4

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Date:   Wed, 1 Jul 2020 16:30:27 +0800
From:   zhengliang <zhengliang6@...wei.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>
CC:     <linux-ext4@...r.kernel.org>
Subject: [PATCH v2] ext4: lost matching-pair of trace in ext4_truncate

It should call trace exit in all return path for ext4_truncate.

v2:
It shoule call trace exit in all return path, and add "out_trace" label to avoid the
multiple copies of the cleanup code in each error case.
 
Signed-off-by: zhengliang <zhengliang6@...wei.com>
---
 fs/ext4/inode.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 10dd470876b3..6187c8880c02 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4163,7 +4163,7 @@ int ext4_truncate(struct inode *inode)
 	trace_ext4_truncate_enter(inode);
 
 	if (!ext4_can_truncate(inode))
-		return 0;
+		goto out_trace;
 
 	if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
 		ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
@@ -4172,16 +4172,14 @@ int ext4_truncate(struct inode *inode)
 		int has_inline = 1;
 
 		err = ext4_inline_data_truncate(inode, &has_inline);
-		if (err)
-			return err;
-		if (has_inline)
-			return 0;
+		if (err || has_inline)
+			goto out_trace;
 	}
 
 	/* If we zero-out tail of the page, we have to create jinode for jbd2 */
 	if (inode->i_size & (inode->i_sb->s_blocksize - 1)) {
 		if (ext4_inode_attach_jinode(inode) < 0)
-			return 0;
+			goto out_trace;
 	}
 
 	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
@@ -4190,8 +4188,10 @@ int ext4_truncate(struct inode *inode)
 		credits = ext4_blocks_for_truncate(inode);
 
 	handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
-	if (IS_ERR(handle))
-		return PTR_ERR(handle);
+	if (IS_ERR(handle)) {
+		err = PTR_ERR(handle);
+		goto out_trace;
+	}
 
 	if (inode->i_size & (inode->i_sb->s_blocksize - 1))
 		ext4_block_truncate_page(handle, mapping, inode->i_size);
@@ -4242,6 +4242,7 @@ int ext4_truncate(struct inode *inode)
 		err = err2;
 	ext4_journal_stop(handle);
 
+out_trace:
 	trace_ext4_truncate_exit(inode);
 	return err;
 }
-- 
2.17.1