linux-kernel - [PATCH 3/4] ext4: factor out ext4_get

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Message-ID: <20250430011301.1106457-3-yi.zhang@huaweicloud.com>
Date: Wed, 30 Apr 2025 09:13:00 +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 3/4] ext4: factor out ext4_get_maxbytes()

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

There are several locations that get the correct maxbytes value based on
the inode's block type. It would be beneficial to extract a common
helper function to make the code more clear.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/ext4.h    | 7 +++++++
 fs/ext4/extents.c | 7 +------
 fs/ext4/file.c    | 7 +------
 fs/ext4/inode.c   | 8 +-------
 4 files changed, 10 insertions(+), 19 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 5a20e9cd7184..8664bb5367c5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3378,6 +3378,13 @@ static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
 	return 1 << sbi->s_log_groups_per_flex;
 }
 
+static inline loff_t ext4_get_maxbytes(struct inode *inode)
+{
+	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+		return inode->i_sb->s_maxbytes;
+	return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
+}
+
 #define ext4_std_error(sb, errno)				\
 do {								\
 	if ((errno))						\
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c616a16a9f36..b294d2f35a26 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4931,12 +4931,7 @@ static const struct iomap_ops ext4_iomap_xattr_ops = {
 
 static int ext4_fiemap_check_ranges(struct inode *inode, u64 start, u64 *len)
 {
-	u64 maxbytes;
-
-	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
-		maxbytes = inode->i_sb->s_maxbytes;
-	else
-		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
+	u64 maxbytes = ext4_get_maxbytes(inode);
 
 	if (*len == 0)
 		return -EINVAL;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index beb078ee4811..b845a25f7932 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -929,12 +929,7 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
 {
 	struct inode *inode = file->f_mapping->host;
-	loff_t maxbytes;
-
-	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
-		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
-	else
-		maxbytes = inode->i_sb->s_maxbytes;
+	loff_t maxbytes = ext4_get_maxbytes(inode);
 
 	switch (whence) {
 	default:
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f9725e6347c7..9f32af1241ff 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;
+	loff_t max_end = ext4_get_maxbytes(inode) - sb->s_blocksize;
 	loff_t end = offset + length;
 	handle_t *handle;
 	unsigned int credits;
@@ -4015,12 +4015,6 @@ 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