linux-ext4 - [PATCH 2/4] ext4: fix incorrect punch max

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Message-ID: <20250430011301.1106457-2-yi.zhang@huaweicloud.com>
Date: Wed, 30 Apr 2025 09:12:59 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	wanghaichi0403@...il.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	libaokun1@...wei.com,
	yukuai3@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH 2/4] ext4: fix incorrect punch max_end

From: Zhang Yi <yi.zhang@...wei.com>

For the extents inodes, the maxbytes should be sb->s_maxbytes instead of
sbi->s_bitmap_maxbytes. Correct the maxbytes value to correct the
behavior of punch hole.

Fixes: 2da376228a24 ("ext4: limit length to bitmap_maxbytes - blocksize in punch_hole")
Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/inode.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4ec4a80b6879..f9725e6347c7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4006,7 +4006,7 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
 	struct inode *inode = file_inode(file);
 	struct super_block *sb = inode->i_sb;
 	ext4_lblk_t start_lblk, end_lblk;
-	loff_t max_end = EXT4_SB(sb)->s_bitmap_maxbytes - sb->s_blocksize;
+	loff_t max_end;
 	loff_t end = offset + length;
 	handle_t *handle;
 	unsigned int credits;
@@ -4015,6 +4015,12 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
 	trace_ext4_punch_hole(inode, offset, length, 0);
 	WARN_ON_ONCE(!inode_is_locked(inode));
 
+	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+		max_end = sb->s_maxbytes;
+	else
+		max_end = EXT4_SB(sb)->s_bitmap_maxbytes;
+	max_end -= sb->s_blocksize;
+
 	/* No need to punch hole beyond i_size */
 	if (offset >= inode->i_size || offset >= max_end)
 		return 0;
-- 
2.46.1