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Deepin Linux

Oct 27, 2023 · Fundamentals

Understanding Linux Kernel I/O Mechanisms, File Systems, and Block I/O Scheduling

This article provides a comprehensive overview of Linux kernel I/O mechanisms, including file system interfaces, blocking and non‑blocking I/O, asynchronous models, multiplexing with select/epoll, EXT file‑system structures, VFS abstraction, consistency and journaling, as well as the complete block I/O path, scheduling algorithms, and debugging tools.

Block I/OI/OKernel

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Understanding Linux Kernel I/O Mechanisms, File Systems, and Block I/O Scheduling

Efficient Ops

Nov 4, 2020 · Fundamentals

How Journal File Systems Prevent Data Corruption After Crashes

Journal file systems use write‑ahead logging to record each write operation as a transaction, ensuring that after power loss or crashes the system can replay logs and maintain metadata and user‑data consistency, avoiding corruption and space waste through techniques like data, ordered, and metadata journaling.

data consistencyfile systemjournaling

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How Journal File Systems Prevent Data Corruption After Crashes

Efficient Ops

Mar 3, 2019 · Fundamentals

How Journal File Systems Prevent Data Loss After Crashes

Journal file systems protect against data corruption caused by power loss or crashes by recording each write operation as a transaction in a dedicated log, then committing the changes only after the log is safely stored, enabling replay to restore consistency.

data consistencyfile systemjournaling

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How Journal File Systems Prevent Data Loss After Crashes