Linux跨多文件系统脚本需删除读写中文件：此功能属系统/文件系统特性？

Awesome question—let’s unpack this step by step, because it’s a great example of how OS kernel behavior and file system design work together, especially with your cross-environment use case.

It’s a collaboration between both, but the core control lives with the operating system kernel, while the file system provides the underlying storage mechanics:

• The OS (like the Linux kernel) handles the system call for deletion (unlink()), manages references to open file descriptors from running processes, and enforces rules about when actual data can be removed.
• The file system (whether ext4, NTFS, FAT32, etc.) takes care of modifying its own metadata (like marking inodes as free, updating directory entries) and adhering to its own locking or reference-counting rules.

Since you’re working with mixed file systems, cross-OS mounts, and need to delete files being read/written by remote processes, here’s what you need to know:

1. Linux’s Behavior for Deleting In-Use Files (Universal Logic) #

When you run rm in Linux, it’s just a wrapper for the unlink() system call:

• If a process still has the file open (via a file descriptor), the Linux kernel won’t delete the actual file data immediately. It only removes the file’s directory entry (so it disappears from directory listings), and waits until all processes holding the descriptor close it before the file system reclaims the disk space.
• This behavior is a Linux kernel feature, not tied to the underlying file system. Whether you’re dealing with ext4, NTFS (via the ntfs-3g driver), or FAT32, as long as it’s mounted on Linux, this reference-counting rule applies.

2. Cross-OS Mount Caveats #

If you remount the partition on Windows or macOS, the rules change:

• Windows uses strict file locking by default: If any process has a file open, deletion attempts will be blocked or throw an error. This is a Windows OS behavior, aligned with how NTFS/FAT32 are designed to work in that ecosystem.
• macOS falls somewhere in between: It allows deleting open files by default, but some apps may use file locks to block deletion—this depends on the app’s implementation and system settings.

3. How to Delete Files Used by Remote Processes in Your Script #

On Linux, you can just use the standard rm command (call it directly in your shell script) even if the file is being read/written by a remote process:

• If the remote process is accessing the file via a network file system (like NFS or Samba), the Linux kernel handles the reference counting. The deletion will remove the directory entry, but the remote process can keep reading/writing until it closes the file—at which point the disk space is reclaimed.
• Pro tip: Make sure you’re using stable Linux drivers for non-native file systems (like ntfs-3g for NTFS). These drivers are built to adapt to Linux’s kernel rules, so they support this delayed-deletion behavior.

4. Potential Pitfalls to Watch For #

• If you delete an in-use file on Linux and then mount the partition on Windows, Windows might detect "orphaned" file data (since the directory entry was deleted but the data hasn’t been reclaimed). You may need to run a disk check tool (like chkdsk on Windows) to clean this up.
• For FAT32, which doesn’t have inodes or built-in reference counting, the Linux kernel simulates this behavior. So you can still delete in-use files, and the kernel will mark the disk blocks as free only once all processes close the file.

内容的提问来源于stack exchange，提问作者Harry