ext4: unify SYNC mode checks in fallocate paths

In the ext4 fallocate call chain, SYNC mode handling is inconsistent:
some places check the inode state, while others check the open file
descriptor state. Unify these checks by evaluating both conditions
to ensure consistent behavior across all fallocate operations.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260327102939.1095257-11-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Author: zhangyi089

fs/ext4/extents.c

@@ -4782,7 +4782,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 		goto out_handle;
 
 	ext4_update_inode_fsync_trans(handle, inode, 1);
-	if (file->f_flags & O_SYNC)
+	if ((file->f_flags & O_SYNC) || IS_SYNC(inode))
 		ext4_handle_sync(handle);
 
 out_handle:
@@ -4820,7 +4820,8 @@ static long ext4_do_fallocate(struct file *file, loff_t offset,
 	if (ret)
 		goto out;
 
-	if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
+	if (((file->f_flags & O_SYNC) || IS_SYNC(inode)) &&
+	    EXT4_SB(inode->i_sb)->s_journal) {
 		ret = ext4_fc_commit(EXT4_SB(inode->i_sb)->s_journal,
 					EXT4_I(inode)->i_sync_tid);
 	}
@@ -5593,7 +5594,7 @@ static int ext4_collapse_range(struct file *file, loff_t offset, loff_t len)
 		goto out_handle;
 
 	ext4_update_inode_fsync_trans(handle, inode, 1);
-	if (IS_SYNC(inode))
+	if ((file->f_flags & O_SYNC) || IS_SYNC(inode))
 		ext4_handle_sync(handle);
 
 out_handle:
@@ -5717,7 +5718,7 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 		goto out_handle;
 
 	ext4_update_inode_fsync_trans(handle, inode, 1);
-	if (IS_SYNC(inode))
+	if ((file->f_flags & O_SYNC) || IS_SYNC(inode))
 		ext4_handle_sync(handle);
 
 out_handle:

fs/ext4/inode.c

@@ -4531,7 +4531,7 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
 		goto out_handle;
 
 	ext4_update_inode_fsync_trans(handle, inode, 1);
-	if (IS_SYNC(inode))
+	if ((file->f_flags & O_SYNC) || IS_SYNC(inode))
 		ext4_handle_sync(handle);
 out_handle:
 	ext4_journal_stop(handle);