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Date: Fri, 25 Feb 2022 21:00:56 -0500 From: "Theodore Ts'o" <tytso@....edu> To: John Hubbard <jhubbard@...dia.com> Cc: Eric Biggers <ebiggers@...nel.org>, Lee Jones <lee.jones@...aro.org>, linux-ext4@...r.kernel.org, Christoph Hellwig <hch@....de>, Dave Chinner <dchinner@...hat.com>, Goldwyn Rodrigues <rgoldwyn@...e.com>, "Darrick J . Wong" <darrick.wong@...cle.com>, Bob Peterson <rpeterso@...hat.com>, Damien Le Moal <damien.lemoal@....com>, Andreas Gruenbacher <agruenba@...hat.com>, Ritesh Harjani <riteshh@...ux.ibm.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Johannes Thumshirn <jth@...nel.org>, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, cluster-devel@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH -v3] ext4: don't BUG if kernel subsystems dirty pages without asking ext4 first On Fri, Feb 25, 2022 at 08:40:36PM -0500, Theodore Ts'o wrote: > Well, that makes it process_vm_writev()'s is that it needs to know > when to call pin_user_file_pages(). Sorry, typed too fast. What I was trying to say is this make it process_vm_writev()'s problem to figure out when it should call pin_user_file_pages() versus some other pin_user_pages function. > I suspect that for many use cases > --- for example, if this is being used by a debugger to modify a > variable on a stack, or an anonymous page in the program's data > segment, process_vm_writev() *isn't* actually pinning a file. So they > want some kind of interface that automatically DTRT regardless of > whether the user pages being edited are file-backed or not > file-backed. - Ted
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