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Message-ID: <20250618170606.GI4037@suse.cz>
Date: Wed, 18 Jun 2025 19:06:06 +0200
From: David Sterba <dsterba@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Jens Axboe <axboe@...nel.dk>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tursulin@...ulin.net>,
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Eric Van Hensbergen <ericvh@...nel.org>,
Latchesar Ionkov <lucho@...kov.net>,
Dominique Martinet <asmadeus@...ewreck.org>,
Christian Schoenebeck <linux_oss@...debyte.com>,
David Sterba <dsterba@...e.com>,
David Howells <dhowells@...hat.com>,
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Subject: Re: [PATCH 10/10] fs: replace mmap hook with .mmap_prepare for
simple mappings
On Mon, Jun 16, 2025 at 08:33:29PM +0100, Lorenzo Stoakes wrote:
> Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file
> callback"), the f_op->mmap() hook has been deprecated in favour of
> f_op->mmap_prepare().
>
> This callback is invoked in the mmap() logic far earlier, so error handling
> can be performed more safely without complicated and bug-prone state
> unwinding required should an error arise.
>
> This hook also avoids passing a pointer to a not-yet-correctly-established
> VMA avoiding any issues with referencing this data structure.
>
> It rather provides a pointer to the new struct vm_area_desc descriptor type
> which contains all required state and allows easy setting of required
> parameters without any consideration needing to be paid to locking or
> reference counts.
>
> Note that nested filesystems like overlayfs are compatible with an
> .mmap_prepare() callback since commit bb666b7c2707 ("mm: add mmap_prepare()
> compatibility layer for nested file systems").
>
> In this patch we apply this change to file systems with relatively simple
> mmap() hook logic - exfat, ceph, f2fs, bcachefs, zonefs, btrfs, ocfs2,
> orangefs, nilfs2, romfs, ramfs and aio.
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> ---
For
> fs/btrfs/file.c | 7 ++++---
Acked-by: David Sterba <dsterba@...e.com>
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