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 D52B437F8DC; Mon, 23 Feb 2026 23:41:01 +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=1771890061; cv=none; b=S2G0XxBT73JXs00NwjsR+lhGayeGju3RcS+Q4DLf5pwPT3245gHV7xBNLEbzWQD4aVaQ2U6HaOmL3jlz9yfCRAz1KauvJ3TdRHhs0N7SDJ6wd/7APKo9zPsCb4A3LbWP9MnVaz4w/ueTfFRd4QZ+GjPxuxq9UjoqpLqpQ7MP9AM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771890061; c=relaxed/simple; bh=qTFs1CcReAsIhdOCN/88qiDJg4FfrkNzfBuASz5DxPg=; h=Date:Subject:From:To:Cc:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kMvAjT/ft5Msyz3sz5Q26YqbazMiOwspd+Dke6jv/sZUzhOyokmYRRN3TsVTkgvcaUxhJLBTy7MFTUk02YwqeWT80qEkrNJvd04HFIgQ8Qy2K67Po4VNliK0xlSnZuH/Kd73VF5hrCPVZ0g0iZUtAhM6z18EgrjcDhCL5OQ4OY8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y1ur0U0U; 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="Y1ur0U0U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ADDF3C116C6; Mon, 23 Feb 2026 23:41:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771890061; bh=qTFs1CcReAsIhdOCN/88qiDJg4FfrkNzfBuASz5DxPg=; h=Date:Subject:From:To:Cc:In-Reply-To:References:From; b=Y1ur0U0UJ9ZOcSSorazhV2U3vBnpYgA/ppTNjAAt7m5wO+sTBfd/uN5PytUhWln3d +fGJ2KzGUMBVkeSk+dygaLHjEHTCYo59bvs7QeOkQ7JoNZlCpyFfbFOpqSsaxc9mBJ xvUHhBfl6g4Ymtfr6qiDlsqaIhbc8tbig8/sH2W8MmMuaYD9/IV0dh39GvO0kFA0fv zxRO4+JPL4TOez2inccTz0Vg4Q9nMDGvQFgxUt1OmJyb8Yk+4pxa/VLFyh9E6aGtrY cHRSbbCyMMnBwcqCoIe9GEOUn+DLpHNU2WTifL/bo1xAt0LiXdPHhPmvsqZOGeCmjR fySJo01AlKQhA== Date: Mon, 23 Feb 2026 15:41:01 -0800 Subject: [PATCH 19/19] fuse2fs: implement freeze and shutdown requests From: "Darrick J. Wong" To: tytso@mit.edu Cc: bpf@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, miklos@szeredi.hu, bernd@bsbernd.com, joannelkoong@gmail.com, neal@gompa.dev Message-ID: <177188744822.3943178.4419152071339815367.stgit@frogsfrogsfrogs> In-Reply-To: <177188744403.3943178.7675407203918355137.stgit@frogsfrogsfrogs> References: <177188744403.3943178.7675407203918355137.stgit@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: linux-fsdevel@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 Handle freezing and shutting down the filesystem if requested. Signed-off-by: "Darrick J. Wong" --- fuse4fs/fuse4fs.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++ misc/fuse2fs.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 175 insertions(+) diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c index 4499f4083f85dd..170accabfd9fd6 100644 --- a/fuse4fs/fuse4fs.c +++ b/fuse4fs/fuse4fs.c @@ -228,6 +228,7 @@ struct fuse4fs_file_handle { enum fuse4fs_opstate { F4OP_READONLY, + F4OP_WRITABLE_FROZEN, F4OP_WRITABLE, F4OP_SHUTDOWN, }; @@ -6166,6 +6167,91 @@ static void op_fallocate(fuse_req_t req, fuse_ino_t fino EXT2FS_ATTR((unused)), } #endif /* SUPPORT_FALLOCATE */ +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) +static void op_freezefs(fuse_req_t req, fuse_ino_t ino, uint64_t unlinked) +{ + struct fuse4fs *ff = fuse4fs_get(req); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE4FS_CHECK_CONTEXT(req); + fs = fuse4fs_start(ff); + + if (ff->opstate == F4OP_WRITABLE) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + else if (!unlinked) + fs->super->s_state |= EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F4OP_WRITABLE_FROZEN; + } + +out_unlock: + fs->super->s_state &= ~EXT2_VALID_FS; + fuse4fs_finish(ff, ret); + fuse_reply_err(req, -ret); +} + +static void op_unfreezefs(fuse_req_t req, fuse_ino_t ino) +{ + struct fuse4fs *ff = fuse4fs_get(req); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE4FS_CHECK_CONTEXT(req); + fs = fuse4fs_start(ff); + + if (ff->opstate == F4OP_WRITABLE_FROZEN) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + fs->super->s_state &= ~EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F4OP_WRITABLE; + } + +out_unlock: + fuse4fs_finish(ff, ret); + fuse_reply_err(req, -ret); +} + +static void op_shutdownfs(fuse_req_t req, fuse_ino_t ino, uint64_t flags) +{ + const struct fuse_ctx *ctxt = fuse_req_ctx(req); + struct fuse4fs *ff = fuse4fs_get(req); + int ret; + + ret = ioctl_shutdown(ff, ctxt, NULL, NULL, 0); + + fuse_reply_err(req, -ret); +} +#endif + #ifdef HAVE_FUSE_IOMAP static void fuse4fs_iomap_hole(struct fuse4fs *ff, struct fuse_file_iomap *iomap, off_t pos, uint64_t count) @@ -7461,6 +7547,11 @@ static struct fuse_lowlevel_ops fs_ops = { #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 18) .statx = op_statx, #endif +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) + .freezefs = op_freezefs, + .unfreezefs = op_unfreezefs, + .shutdownfs = op_shutdownfs, +#endif #ifdef HAVE_FUSE_IOMAP .iomap_begin = op_iomap_begin, .iomap_end = op_iomap_end, diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c index 6266c1de163694..4535bb16efd586 100644 --- a/misc/fuse2fs.c +++ b/misc/fuse2fs.c @@ -222,6 +222,7 @@ struct fuse2fs_file_handle { enum fuse2fs_opstate { F2OP_READONLY, + F2OP_WRITABLE_FROZEN, F2OP_WRITABLE, F2OP_SHUTDOWN, }; @@ -5700,6 +5701,86 @@ static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode, } #endif /* SUPPORT_FALLOCATE */ +#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) +static int op_freezefs(const char *path, uint64_t unlinked) +{ + struct fuse2fs *ff = fuse2fs_get(); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE2FS_CHECK_CONTEXT(ff); + fs = fuse2fs_start(ff); + + if (ff->opstate == F2OP_WRITABLE) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + else if (!unlinked) + fs->super->s_state |= EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F2OP_WRITABLE_FROZEN; + } + +out_unlock: + fs->super->s_state &= ~EXT2_VALID_FS; + fuse2fs_finish(ff, ret); + return ret; +} + +static int op_unfreezefs(const char *path) +{ + struct fuse2fs *ff = fuse2fs_get(); + ext2_filsys fs; + errcode_t err; + int ret = 0; + + FUSE2FS_CHECK_CONTEXT(ff); + fs = fuse2fs_start(ff); + + if (ff->opstate == F2OP_WRITABLE_FROZEN) { + if (fs->super->s_error_count) + fs->super->s_state |= EXT2_ERROR_FS; + ext2fs_mark_super_dirty(fs); + err = ext2fs_set_gdt_csum(fs); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + err = ext2fs_flush2(fs, 0); + if (err) { + ret = translate_error(fs, 0, err); + goto out_unlock; + } + + ff->opstate = F2OP_WRITABLE; + } + +out_unlock: + fuse2fs_finish(ff, ret); + return ret; +} + +static int op_shutdownfs(const char *path, uint64_t flags) +{ + struct fuse2fs *ff = fuse2fs_get(); + + return ioctl_shutdown(ff, NULL, NULL); +} +#endif + #ifdef HAVE_FUSE_IOMAP static void fuse2fs_iomap_hole(struct fuse2fs *ff, struct fuse_file_iomap *iomap, off_t pos, uint64_t count) @@ -6984,6 +7065,9 @@ static struct fuse_operations fs_ops = { #endif #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99) .getattr_iflags = op_getattr_iflags, + .freezefs = op_freezefs, + .unfreezefs = op_unfreezefs, + .shutdownfs = op_shutdownfs, #endif #ifdef HAVE_FUSE_IOMAP .iomap_begin = op_iomap_begin,