From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D53D52D2381; Wed, 29 Oct 2025 01:04:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761699888; cv=none; b=NKSKHenr9VFxoDhoVyub2+8F4Vv9NK54W9KZuLqpx5DJyMcHjoGAyuNKM0K7EHiwAZfna3QjCnCpEmnoZr3w8g7BBWUmEiHRkSmjFFMiR448F9JKrB7iy0+HnDp3+A7Ta+J3Uu9uvxuWIxFUT7uQg5ojVjzjFTZtT9Etx9EVif0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761699888; c=relaxed/simple; bh=f+bF98SpYOEeXr1qRa9QzgR1SbTr6s1biUTsw1PoK80=; h=Date:Subject:From:To:Cc:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tMbrpB5hzAPHq7NFTgSDQGQid7cASXR9WHI39GALuwusEygjtY9ckvrbMrtXNT7iCoTb2SoIbAReXq49MaapkdxQ9fPWMCUa0wxPElbM1Co9lWnHHkCESovVDPWl4zco1x5scGZFLxnbIprhE6FfEeYMsWoqgQgsfp8sGnWEERc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OgxQnJjP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OgxQnJjP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65432C4CEE7; Wed, 29 Oct 2025 01:04:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761699887; bh=f+bF98SpYOEeXr1qRa9QzgR1SbTr6s1biUTsw1PoK80=; h=Date:Subject:From:To:Cc:In-Reply-To:References:From; b=OgxQnJjPyndbPJtEFONFZzxPKzydGknTsXFjlI7VKbG4JwBPEgOtvGxw73yZExbSQ v+vVH59Oh/8UgKnURtp9kgWMcCYzR0XImMDAOPC2yeCNFUZHNr0Oip5DO2p6HZLjeQ Z/ApM4xfjbrKVCaGnzAk4bc6LEuD9vOLG8O09L25scZg+9Jn3lGyN8vfRiHj4+q3dH +ynF1FniZduH/oKvwinAoXC5S5JRnvOfbhW/H6GCKxnvx6UJm5NUbk0KhVLOklhkiJ 1kzE7xRBoDRwoqx9YgkZv7QWtsI+V6pbDsNZ1WUm1K4v0uAGmfZr3+eDpmXYUsnCll mIS5YCVg+8F6g== Date: Tue, 28 Oct 2025 18:04:46 -0700 Subject: [PATCH 21/22] libfuse: add lower-level filesystem freeze, thaw, and shutdown requests From: "Darrick J. Wong" To: djwong@kernel.org, bschubert@ddn.com Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, bernd@bsbernd.com, miklos@szeredi.hu, joannelkoong@gmail.com, neal@gompa.dev Message-ID: <176169813912.1427432.13731634577241744688.stgit@frogsfrogsfrogs> In-Reply-To: <176169813437.1427432.15345189583850708968.stgit@frogsfrogsfrogs> References: <176169813437.1427432.15345189583850708968.stgit@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Darrick J. Wong Pass the kernel's filesystem freeze, thaw, and shutdown requests through to low level fuse servers. Signed-off-by: "Darrick J. Wong" --- include/fuse_kernel.h | 12 +++++++++ include/fuse_lowlevel.h | 35 +++++++++++++++++++++++++++ lib/fuse_lowlevel.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+) diff --git a/include/fuse_kernel.h b/include/fuse_kernel.h index 5b9259714a628d..37e5eb8c65f206 100644 --- a/include/fuse_kernel.h +++ b/include/fuse_kernel.h @@ -676,6 +676,10 @@ enum fuse_opcode { FUSE_STATX = 52, FUSE_COPY_FILE_RANGE_64 = 53, + FUSE_FREEZE_FS = 4089, + FUSE_UNFREEZE_FS = 4090, + FUSE_SHUTDOWN_FS = 4091, + FUSE_IOMAP_CONFIG = 4092, FUSE_IOMAP_IOEND = 4093, FUSE_IOMAP_BEGIN = 4094, @@ -1225,6 +1229,14 @@ struct fuse_syncfs_in { uint64_t padding; }; +struct fuse_freezefs_in { + uint64_t unlinked; +}; + +struct fuse_shutdownfs_in { + uint64_t flags; +}; + /* * For each security context, send fuse_secctx with size of security context * fuse_secctx will be followed by security context name and this in turn diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h index 110f7f73edbb2a..b37d1f03ab5d7f 100644 --- a/include/fuse_lowlevel.h +++ b/include/fuse_lowlevel.h @@ -1422,6 +1422,41 @@ struct fuse_lowlevel_ops { */ void (*iomap_config) (fuse_req_t req, uint64_t flags, uint64_t maxbytes); + + /** + * Freeze the filesystem + * + * Valid replies: + * fuse_reply_err + * + * @param req request handle + * @param ino the root inode number + * @param unlinked count of open unlinked inodes + */ + void (*freezefs) (fuse_req_t req, fuse_ino_t ino, uint64_t unlinked); + + /** + * Thaw the filesystem + * + * Valid replies: + * fuse_reply_err + * + * @param req request handle + * @param ino the root inode number + */ + void (*unfreezefs) (fuse_req_t req, fuse_ino_t ino); + + /** + * Shut down the filesystem + * + * Valid replies: + * fuse_reply_err + * + * @param req request handle + * @param ino the root inode number + * @param flags zero, currently + */ + void (*shutdownfs) (fuse_req_t req, fuse_ino_t ino, uint64_t flags); }; /** diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c index 605848bb4cd55b..728a6b635471c7 100644 --- a/lib/fuse_lowlevel.c +++ b/lib/fuse_lowlevel.c @@ -2835,6 +2835,60 @@ static void do_iomap_config(fuse_req_t req, const fuse_ino_t nodeid, _do_iomap_config(req, nodeid, inarg, NULL); } +static void _do_freezefs(fuse_req_t req, const fuse_ino_t nodeid, + const void *op_in, const void *in_payload) +{ + const struct fuse_freezefs_in *inarg = op_in; + (void)in_payload; + + if (req->se->op.freezefs) + req->se->op.freezefs(req, nodeid, inarg->unlinked); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_freezefs(fuse_req_t req, const fuse_ino_t nodeid, + const void *inarg) +{ + _do_freezefs(req, nodeid, inarg, NULL); +} + +static void _do_unfreezefs(fuse_req_t req, const fuse_ino_t nodeid, + const void *op_in, const void *in_payload) +{ + (void)op_in; + (void)in_payload; + + if (req->se->op.unfreezefs) + req->se->op.unfreezefs(req, nodeid); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_unfreezefs(fuse_req_t req, const fuse_ino_t nodeid, + const void *inarg) +{ + _do_unfreezefs(req, nodeid, inarg, NULL); +} + +static void _do_shutdownfs(fuse_req_t req, const fuse_ino_t nodeid, + const void *op_in, const void *in_payload) +{ + const struct fuse_shutdownfs_in *inarg = op_in; + (void)in_payload; + + if (req->se->op.shutdownfs) + req->se->op.shutdownfs(req, nodeid, inarg->flags); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_shutdownfs(fuse_req_t req, const fuse_ino_t nodeid, + const void *inarg) +{ + _do_shutdownfs(req, nodeid, inarg, NULL); +} + static bool want_flags_valid(uint64_t capable, uint64_t want) { uint64_t unknown_flags = want & (~capable); @@ -3764,6 +3818,9 @@ static struct { [FUSE_COPY_FILE_RANGE_64] = { do_copy_file_range_64, "COPY_FILE_RANGE_64" }, [FUSE_LSEEK] = { do_lseek, "LSEEK" }, [FUSE_STATX] = { do_statx, "STATX" }, + [FUSE_FREEZE_FS] = { do_freezefs, "FREEZE" }, + [FUSE_UNFREEZE_FS] = { do_unfreezefs, "UNFREEZE" }, + [FUSE_SHUTDOWN_FS] = { do_shutdownfs, "SHUTDOWN" }, [FUSE_IOMAP_CONFIG]= { do_iomap_config, "IOMAP_CONFIG" }, [FUSE_IOMAP_BEGIN] = { do_iomap_begin, "IOMAP_BEGIN" }, [FUSE_IOMAP_END] = { do_iomap_end, "IOMAP_END" }, @@ -3824,6 +3881,9 @@ static struct { [FUSE_COPY_FILE_RANGE_64] = { _do_copy_file_range_64, "COPY_FILE_RANGE_64" }, [FUSE_LSEEK] = { _do_lseek, "LSEEK" }, [FUSE_STATX] = { _do_statx, "STATX" }, + [FUSE_FREEZE_FS] = { _do_freezefs, "FREEZE" }, + [FUSE_UNFREEZE_FS] = { _do_unfreezefs, "UNFREEZE" }, + [FUSE_SHUTDOWN_FS] = { _do_shutdownfs, "SHUTDOWN" }, [FUSE_IOMAP_CONFIG] = { _do_iomap_config, "IOMAP_CONFIG" }, [FUSE_IOMAP_BEGIN] = { _do_iomap_begin, "IOMAP_BEGIN" }, [FUSE_IOMAP_END] = { _do_iomap_end, "IOMAP_END" },