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Thu, 27 Mar 2025 08:32:37 -0700 (PDT) Received: from sidongui-MacBookPro.local ([61.83.209.48]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2291f1f7cc2sm711265ad.258.2025.03.27.08.32.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Mar 2025 08:32:36 -0700 (PDT) Date: Fri, 28 Mar 2025 00:32:32 +0900 From: Sidong Yang To: Pavel Begunkov Cc: Josef Bacik , David Sterba , Mark Harmstone , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Jens Axboe Subject: Re: [PATCH 6.14] btrfs: ioctl: error on fixed buffer flag for io-uring cmd Message-ID: References: <20250326155736.611445-1-sidong.yang@furiosa.ai> <411a996d-8e47-4b30-8782-4418cf701f69@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <411a996d-8e47-4b30-8782-4418cf701f69@gmail.com> On Thu, Mar 27, 2025 at 02:58:11PM +0000, Pavel Begunkov wrote: > On 3/26/25 15:57, Sidong Yang wrote: > > Currently, the io-uring fixed buffer cmd flag is silently dismissed, > > even though it does not work. This patch returns an error when the flag > > is set, making it clear that operation is not supported. > > IIRC, the feature where you use the flag hasn't been merged > yet and is targeting 6.16. In this case you need to send this > patch for 6.15, and once merged stable will try to pick it up > from there. Thanks, I mistakenly thought the feature would be merged in 6.15. If so, I need send this for 6.15 after sending the patch for the fixed buffer feature. > > > Fixes: 34310c442e17 ("btrfs: add io_uring command for encoded reads (ENCODED_READ ioctl)") > > Cc: stable@vger.kernel.org > > Signed-off-by: Sidong Yang > > --- > > fs/btrfs/ioctl.c | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > > index 6c18bad53cd3..62bb9e11e8d6 100644 > > --- a/fs/btrfs/ioctl.c > > +++ b/fs/btrfs/ioctl.c > > @@ -4823,6 +4823,12 @@ static int btrfs_uring_encoded_read(struct io_uring_cmd *cmd, unsigned int issue > > ret = -EPERM; > > goto out_acct; > > } > > + > > + if (cmd->flags & IORING_URING_CMD_FIXED) { > > + ret = -EOPNOTSUPP; > > + goto out_acct; > > + } > > + > > file = cmd->file; > > inode = BTRFS_I(file->f_inode); > > fs_info = inode->root->fs_info; > > @@ -4959,6 +4965,11 @@ static int btrfs_uring_encoded_write(struct io_uring_cmd *cmd, unsigned int issu > > goto out_acct; > > } > > + if (cmd->flags & IORING_URING_CMD_FIXED) { > > + ret = -EOPNOTSUPP; > > + goto out_acct; > > + } > > + > > file = cmd->file; > > sqe_addr = u64_to_user_ptr(READ_ONCE(cmd->sqe->addr)); > > -- > Pavel Begunkov >