Re: [bugzilla:219548] the kernel crashes when storing an EXT4 file system in a ZRAM device
From: Christoph Hellwig <hch@infradead.org>
Date: 2024-12-12 07:35:42
Also in:
linux-ext4, linux-fsdevel
On Thu, Dec 12, 2024 at 12:37:39AM -0500, Theodore Ts'o wrote:
More generally, any file system which uses the buffer cache, and doesn't use jbd2 to control when writeback happens, I think is going to be at risk with a block device which requires stable writes. The only way to fix this, really, is to have the buffer cache code copy the data to a bounce buffer, and then issue the write from the bounce buffer.
Should there be a pr_warn_once when using a file systems using the legacy buffer cache interfaces on a device that requires stable pages?