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smtp.kernel.org (Postfix) with ESMTPSA id 2DB65C4CEF6; Thu, 10 Jul 2025 13:52:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752155575; bh=l97vSGUhaIvTpKN0sJykGom3s3WBV5JIH9Z1Dprfa3Q=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=O5w39cjxB04tmwqxwQEjx0WJsJQumXBElorkQArMbQAZCDl0UZqFD6Yv4LyEcamF7 m/3A0NE5l2eHCJRdyaHayAe/cnyR11nszOCDGzvmHPeM5bZGRXTFeUyY3J/+s9XAMf 5AgLwMW6kZv5GRLhLxuzrUb9VKhhUx5g8C1PU+H1Ytmi0g+QjvAmcRNgaDwVd7lDXf DtLl8ry+eO6B33tlDOMtxK0cHku4wAjoJHlCvscdcWjLSaYSLu0+aaBqNdzSfYwuwp F2FKYdSU69Cdtb4npsZGUNC0YagFeLJSluX4aJYjHxCeDvJdcwi9iCidCiSgh24yFO UCHI5Lzc479pg== Message-ID: <5819d6c5bb194613a14d2dcf05605e701683ba49.camel@kernel.org> Subject: Re: [RFC PATCH v2 4/8] lib/iov_iter: remove piecewise bvec length checking in iov_iter_aligned_bvec From: Jeff Layton To: Mike Snitzer , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, linus-fsdevel@vger.kernel.org, linux-mm@kvack.org, kbusch@kernel.org, hch@infradead.org Date: Thu, 10 Jul 2025 09:52:53 -0400 In-Reply-To: <20250708160619.64800-5-snitzer@kernel.org> References: <20250708160619.64800-1-snitzer@kernel.org> <20250708160619.64800-5-snitzer@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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U2FsdGVkX1/EzIedUjs5ie9X3RAoPSSmEbtcIrQpqdxOZ4xNgj8LUt8eQKzXGTgdu6fZOdweF6SSi77A1nlCl6HMiCrwa5W42NvllMS/q1IiY1jXzaOm12NpT0u6hB0B2JcUnjqsGCZaN0kdKqK9H+IhESasmY1W4DbLaIFw6ddpILQBevYfm5N3ZAnvLhoMO5Nn7NLdS80/TLkkFyjTeuqbCKTFRiuJ+e1YESM73NxSrXysRrBUex8E/+qAtqLpYLBQ/QnekGU4sfbQQZyrV3QiTssfpxd0XEWA0N1mSzmmf0OBSnNiU4Mp11VQiZU7GBnPu719IjEb6AtSqYP83hEKiavRpEUJBRME71lnrjiU+J2QkGOfDvar1a12maw3XXMm5YeADnTRJu5we4qxyEAqfAcQWqvzHD4EBpmlExA9BxxPFsQ+A5EFC9PxCA/jEExHYmixYnIXGgTDotRLTlnkzMueKq31B1UYSf9t9UdAh3a8AmdQfHzWaLzVqjhpJnc5BEnQOFVlFSp4Eua9DwK/VUlMjj9ZWwFdbCKTBklx2XUqFwFdAPIR9ZbI09XZrnABdcWHzsmwbpYv5liAOuVzTtFYM+/28mk2E1AHbTCs07osnkD3ji0OXHh++wSxpWDt6qyLXDyPSo1VPQe0n1v5jzfoCrFI9Yau06YvP2Cp3E6VCha5uCAtPIjtJUdTYt5/vJQfkL0P1EQWPkoHbU7sb+HRO9QGQ1KhyAXZIncYrEZ8s4b+Ujvc0Exua8YMnEJyH7nlBmkGEs4ThRy0s8qNKdFsNzQJUY0v/+6tCLni51CkXsMjxrSOSp39UV0evARq1mRw7S7PmZmgp4UZSmU8sKlgKTVr24DFw9+fJzEq09h5YP0oIdLTaZlYrVyZhZQX8/n39dPE9gDtwbhM1w8ntCM7uEK6KHwd2HeJZGWESHSkVyAXlRUVy64G92WPGr945n/ZbhorePhz/KG vM43e9Zs rpTR3T2Gnl+M8mF1hWkZcw/OTGVBmkOBII8g+ethMUBEO9+hYGfkE5+QMju6H+f/JR2kI1mIu3NiJBjvpDcCXT47lVCg4A6aHHGiCbcgz3p3rZsfWPgkdjMc5C3LewuP7bHb34g0ZHtWlAGiEC8r1IhDRl4vPP44y3UVsQM3YCcSRmmO6sWtq1DNZ37t1FDgravZvRXyj2plUPyDF1BzrLiVw/idhnoKsZ8zvthuym0Gzj+mY4rWFM/awTOXtGSfk4mtCCHCllnBShDAvRuRplC6poPzVbwZknv44 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 2025-07-08 at 12:06 -0400, Mike Snitzer wrote: > iov_iter_aligned_bvec() is strictly checking alignment of each element > of the bvec to arrive at whether the bvec is aligned relative to > dma_alignment and on-disk alignment. Checking each element > individually results in disallowing a bvec that in aggregate is > perfectly aligned relative to the provided @len_mask. >=20 > Relax the on-disk alignment checking such that it is done on the full > extent described by the bvec but still do piecewise checking of the > dma_alignment for each bvec's bv_offset. >=20 > This allows for NFS's WRITE payload to be issued using O_DIRECT as > long as the bvec created with xdr_buf_to_bvec() is composed of pages > that respect the underlying device's dma_alignment (@addr_mask) and > the overall contiguous on-disk extent is aligned relative to the > logical_block_size (@len_mask). >=20 > Signed-off-by: Mike Snitzer > --- > lib/iov_iter.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) >=20 > diff --git a/lib/iov_iter.c b/lib/iov_iter.c > index bdb37d572e97..b2ae482b8a1d 100644 > --- a/lib/iov_iter.c > +++ b/lib/iov_iter.c > @@ -819,13 +819,14 @@ static bool iov_iter_aligned_bvec(const struct iov_= iter *i, unsigned addr_mask, > unsigned skip =3D i->iov_offset; > size_t size =3D i->count; > =20 > + if (size & len_mask) > + return false; > + > do { > size_t len =3D bvec->bv_len; > =20 > if (len > size) > len =3D size; > - if (len & len_mask) > - return false; > if ((unsigned long)(bvec->bv_offset + skip) & addr_mask) > return false; > =20 cc'ing Keith too since he wrote this helper originally. Should this also get a: Fixes: cfa320f72882 ("iov: introduce iov_iter_aligned") ? --=20 Jeff Layton