debugfs报“Bad magic number”错误，如何获取Linux文件创建时间？

Hey there! Let's tackle your problem of getting file creation times on Linux, especially for your file 33567136 and others. I know you hit a snag after looking up tutorials and got confused by the filesystem repair suggestion even though your system runs fine—let's break this down step by step.

First, a quick heads-up: Linux doesn't natively track "creation time" (called crtime) on all filesystems. It's supported on ext4 and newer filesystems, but older ones like ext3 don't have this feature. Here are the most reliable methods to try:

方法1：用stat命令快速查看（ext4+ 优先） #

This is the simplest approach if your filesystem supports it. Run either of these commands for your file:

# 仅输出创建时间
stat -c "%w" 33567136

# 输出完整文件信息，找"Birth"字段
stat 33567136

If the Birth field shows -, that means your filesystem doesn't support crtime, or you don't have the right permissions to access it.

方法2：用debugfs深度查询（需root权限） #

If stat doesn't show the creation time, debugfs can dig into the filesystem metadata directly (works for ext filesystems):

1. First, find which partition your file is on with df:

df 33567136

Let's say the output shows /dev/sda1 as the partition.
2. Remount the partition as read-only to avoid accidental damage:

sudo mount -o remount,ro /dev/sda1

3. Get the file's inode number (unique identifier):

ls -i 33567136

You'll get a number like 12345—note that down.
4. Run debugfs to fetch the creation time:

sudo debugfs -R 'stat <12345>' /dev/sda1

Look for the crtime line in the output—that's your file's creation time.

关于"文件系统损坏"的提示 #

You mentioned Google results suggested repairing your filesystem, but your system works fine. Here's why that might happen:

• Your filesystem (likely ext4) has minor inconsistencies from a past improper shutdown—these don't break daily use but trigger warnings in tools.
• Older versions of filesystem tools might misinterpret minor metadata quirks as corruption.

You don't need to rush into repairing if you can still access files and get the creation time via the methods above. If you do decide to repair later, always back up your data first, then run:

sudo umount /dev/sda1
sudo fsck /dev/sda1

(Important: Unmount the partition first—never run fsck on a mounted filesystem!)

批量处理其他文件 #

To get creation times for multiple files at once, you can use a simple bash script. For example, to check all files in a directory:

for file in /path/to/your/target/files/*; do
    echo "File: $file | Creation Time: $(stat -c "%w" "$file")"
done

If stat doesn't work, you can expand this script to use debugfs with inodes—just loop through each file's inode number and run the debugfs command for each.

内容的提问来源于stack exchange，提问作者J. Doe