On Sun, Jun 22, 2025 at 08:32:18PM +0800, ying chen wrote: > Normally, user space returns immediately after writing data to the > buffer cache. However, if an error occurs during the actual disk > write operation, data loss may ensue, and there is no way to report > this error back to user space immediately. Current kernels may report > writeback errors when fsync() is called, but frequent invocations of > fsync() can degrade performance. Therefore, a new sysctl > fs.xfs.report_writeback_error_on_read is introduced, which, when set > to 1, reports writeback errors when read() is called. This allows user > space to be notified of writeback errors more promptly. That's really kernel wide policy and not something magic done by a single file system.
