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iomap: Remove FGP_NOFS from iomap_get_folio()

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FGP_NOFS is legacy; filesystems should be using memalloc_nofs_save/restore
instead.  We have it here in iomap because it was buried in
grab_cache_page_write_begin() and we didn't want to change this behaviour
as part of the folio transition.

I have tested this with XFS and see no issues.  Other filesystems (cc'd)
may need to make adjustments.  Please test with lockdep enabled.

Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Sungjong Seo <sj1557.seo@samsung.com>
Cc: Yuezhang Mo <yuezhang.mo@sony.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: Carlos Maiolino <cem@kernel.org>
Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Naohiro Aota <naohiro.aota@wdc.com>
Cc: Johannes Thumshirn <jth@kernel.org>
Cc: linux-xfs@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-block@vger.kernel.org
Cc: fuse-devel@lists.linux.dev
Cc: gfs2@lists.linux.dev
Cc: ntfs3@lists.linux.dev
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://patch.msgid.link/20260624174228.2015893-1-willy@infradead.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2026-06-24 18:42:26 +01:00 • committed by Christian Brauner
commit e08fd61191
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