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smtp.kernel.org (Postfix) with ESMTPSA id 19147C4AF09; Tue, 19 Aug 2025 10:08:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755598128; bh=737a7gXy/T0JRvCPCsi7SuPm2Di5qOsTwyUNcFvqQ4s=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=sGUfOUlYN/Mn0Zsh4uuzrZh1ZP6AWTBOeMXkmBp0O0DD/NVabVFQIDkcOiU29LCH4 NfjT1HT+kRJtVJnqtV+1iq0xzWMJELIAzL0pG+yqBh0p9YARdcdbX2/btUdHD5eaiP 8XsJAE+M+nLpqfg5S2A2LU8AEhvq7iKxoV+D9ardpuzHfejvxJO9Rq7EVu8GH4GelI cpbp3htQscMsCpLrikXb7q6wJRXzc2hRp/gRtcNUJWxHxw0NoerwqFFhQqGe684Vq1 Q2Cd5bo1DYyTqphbFy9JeXsb0TnzzTV05M0C/D2bEIhrGtEj42wXthnzvz+ZEaNCat c7ZxZmS/PJ5Ew== Message-ID: <0a5c4b7deb443ac5f62d00b0bd0e1dd649bef8fe.camel@kernel.org> Subject: Re: [PATCH] tmpfs: preserve SB_I_VERSION on remount From: Jeff Layton To: libaokun@huaweicloud.com, linux-mm@kvack.org Cc: hughd@google.com, baolin.wang@linux.alibaba.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Baokun Li Date: Tue, 19 Aug 2025 06:08:47 -0400 In-Reply-To: <20250819061803.1496443-1-libaokun@huaweicloud.com> References: <20250819061803.1496443-1-libaokun@huaweicloud.com> 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 CBYyUE8QJpvTZyfUHNYldXlrjO6n5MdOempLqWpfOmcGkwnyNRBR46g/jf8KnPRwXs509yAqDB6sE LZH+yWr9LQZEwARAQABtCVKZWZmIExheXRvbiA8amxheXRvbkBwb29jaGllcmVkcy5uZXQ+iQI7BB 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 fPYFsS/8 VHFEAg3hAul+h3rpuTC5j2hMqC9Au+AStn9WNDiilOxa1UFuhbMzt/HhUMfigriC/Wpf7ceXSQ3Jbjxsd1OSsUNWZlIcgPjJjPjcQqskx8Dnglus/pnFoXwnWO9lbcRPM7rLfOvDNQ5/6BP2hlU7ZJ1CaQiu7kKLbpUyjSrL/N+n4YVcE+9gpx/+82zuoCCqj3UK+qtobMG9cVPNpuFewYiDNQxQD4hgXUd6u/0preZMVUCUzzQ8bZjQGoR8PjRdWtH5nTHTUed/E+wSYVLCNcUdRT9DtFj2YdvhdI4wbZWJLznDQQTanDidWw/jVzTh+QHalHWJ52vyI5wwK41WbCPfdpw== 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, 2025-08-19 at 14:18 +0800, libaokun@huaweicloud.com wrote: > From: Baokun Li >=20 > Now tmpfs enables i_version by default and tmpfs does not modify it. But > SB_I_VERSION can also be modified via sb_flags, and reconfigure_super() > always overwrites the existing flags with the latest ones. This means tha= t > if tmpfs is remounted without specifying iversion, the default i_version > will be unexpectedly disabled. >=20 > To ensure iversion remains enabled, SB_I_VERSION is now always set for > fc->sb_flags in shmem_init_fs_context(), instead of for sb->s_flags in > shmem_fill_super(). >=20 > Fixes: 36f05cab0a2c ("tmpfs: add support for an i_version counter") > Signed-off-by: Baokun Li > --- > mm/shmem.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) >=20 > diff --git a/mm/shmem.c b/mm/shmem.c > index e2c76a30802b..eebe12ff5bc6 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -5081,7 +5081,7 @@ static int shmem_fill_super(struct super_block *sb,= struct fs_context *fc) > sb->s_flags |=3D SB_NOUSER; > } > sb->s_export_op =3D &shmem_export_ops; > - sb->s_flags |=3D SB_NOSEC | SB_I_VERSION; > + sb->s_flags |=3D SB_NOSEC; > =20 > #if IS_ENABLED(CONFIG_UNICODE) > if (!ctx->encoding && ctx->strict_encoding) { > @@ -5385,6 +5385,9 @@ int shmem_init_fs_context(struct fs_context *fc) > =20 > fc->fs_private =3D ctx; > fc->ops =3D &shmem_fs_context_ops; > +#ifdef CONFIG_TMPFS > + fc->sb_flags |=3D SB_I_VERSION; > +#endif > return 0; > } > =20 Reviewed-by: Jeff Layton