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Thunderbird Subject: Re: [PATCH] btrfs: fix GET_SUBVOL_INFO after compat refactor To: daan@amutable.com, Chris Mason , David Sterba Cc: Qu Wenruo , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260713-btrfs-get-subvol-info-fix-v1-1-a58cc55b3696@amutable.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn 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This is expected here, since offset 0 is used > to find the first ROOT_BACKREF for the subvolume and the actual key has > the parent root ID as its offset. >=20 > Before the compat ioctl refactoring, the native handler still copied the > filled structure to userspace when the search returned 1. After the > lookup was moved to a shared helper, both native and compat callers > treat the positive return value as a failure and skip copy_to_user(), > leaving BTRFS_IOC_GET_SUBVOL_INFO unusable for non-top-level > subvolumes. >=20 > Reset ret after successfully validating and reading the ROOT_BACKREF so > the helper reports success and both callers copy the result to > userspace. >=20 > Fixes: 538e5bdbc899 ("btrfs: add 32-bit compat ioctl for BTRFS_IOC_GET_S= UBVOL_INFO") > Signed-off-by: Daan De Meyer Reviewed-by: Qu Wenruo Thanks, Qu > --- > Fix BTRFS_IOC_GET_SUBVOL_INFO for non-top-level subvolumes after the > recent 32-bit compat ioctl refactor. > --- > fs/btrfs/ioctl.c | 1 + > 1 file changed, 1 insertion(+) >=20 > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > index 9d47d16394fc..ab6c17716026 100644 > --- a/fs/btrfs/ioctl.c > +++ b/fs/btrfs/ioctl.c > @@ -2042,6 +2042,7 @@ static int _btrfs_ioctl_get_subvol_info(struct ino= de *inode, > ret =3D -ENOENT; > goto out; > } > + ret =3D 0; > } > =20 > out: >=20 > --- > base-commit: cab9e339cfbc1a4e075e53e281dfb00391e1a6bb > change-id: 20260713-btrfs-get-subvol-info-fix-e93803926554 >=20 > Best regards, > -- > Daan De Meyer >=20 >=20 >=20