Re: [PATCH 1/2] mm/readahead: Add gfp_flags to ractl

[PATCH 0/2] Close a hole where IOCB_NOWAIT reads could sleep · "Matthew Wilcox (Oracle)" <willy@infradead.org> · 2021-07-11
[PATCH 1/2] mm/readahead: Add gfp_flags to ractl · "Matthew Wilcox (Oracle)" <willy@infradead.org> · 2021-07-11
Re: [PATCH 1/2] mm/readahead: Add gfp_flags to ractl · Christoph Hellwig <hch@infradead.org> · 2021-07-12
Re: [PATCH 1/2] mm/readahead: Add gfp_flags to ractl · Matthew Wilcox <willy@infradead.org> · 2021-07-12
[PATCH 2/2] mm/filemap: Prevent waiting for memory for NOWAIT reads · "Matthew Wilcox (Oracle)" <willy@infradead.org> · 2021-07-11
Re: [PATCH 0/2] Close a hole where IOCB_NOWAIT reads could sleep · Jens Axboe <axboe@kernel.dk> · 2021-07-12
Re: [PATCH 0/2] Close a hole where IOCB_NOWAIT reads could sleep · Matthew Wilcox <willy@infradead.org> · 2021-07-24
Re: [PATCH 0/2] Close a hole where IOCB_NOWAIT reads could sleep · Jens Axboe <axboe@kernel.dk> · 2021-07-24

From: Christoph Hellwig <hch@infradead.org>
Date: 2021-07-12 11:34:44
Also in: io-uring, linux-fsdevel

On Sun, Jul 11, 2021 at 04:09:26PM +0100, Matthew Wilcox (Oracle) wrote:

It is currently possible for an I/O request that specifies IOCB_NOWAIT
to sleep waiting for I/O to complete in order to allocate pages for
readahead.  In order to fix that, we need the caller to be able to
specify the GFP flags to use for memory allocation in the rest of the
readahead path.

The file systems also need to respect it for their bio or private
data allocation.  And be able to cope with failure, which they currently
don't have to for sleeping bio allocations.

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