From patchwork Wed Dec 15 22:17:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12679625 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1315C43219 for ; Wed, 15 Dec 2021 22:17:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231258AbhLOWRT (ORCPT ); Wed, 15 Dec 2021 17:17:19 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:38290 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231253AbhLOWRP (ORCPT ); Wed, 15 Dec 2021 17:17:15 -0500 Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 1BFLibQ0007999 for ; Wed, 15 Dec 2021 14:17:14 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=Lk8WxajQmZuUXdMwkexMZB8jvF1AaFG+BQSeIRUYsHM=; b=Opb31koA8Rko5zM9yU0oj5XtlAB14fh+KyNaGOZOkw5NA7i9VZ4wZhPilOhHOl0Sx3RC 1Qd3MmMBJRrEKKLTLvomClYSqk7rQqK62bO+euNtrraVnplIIx8Qv7XBTj7+aMsBXCt1 c698p3xDvHUjS8UVbNbYUSVg9vFgeVTJD10= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3cy7crfpkp-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 15 Dec 2021 14:17:14 -0800 Received: from intmgw001.05.ash9.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Wed, 15 Dec 2021 14:17:12 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 733D081B01A4; Wed, 15 Dec 2021 14:17:05 -0800 (PST) From: Stefan Roesch To: , , CC: , Subject: [PATCH v4 4/5] io_uring: add fsetxattr and setxattr support Date: Wed, 15 Dec 2021 14:17:01 -0800 Message-ID: <20211215221702.3695098-5-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211215221702.3695098-1-shr@fb.com> References: <20211215221702.3695098-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-GUID: 7mqZKpFd7GbAdxves2oo4872t1tntOSJ X-Proofpoint-ORIG-GUID: 7mqZKpFd7GbAdxves2oo4872t1tntOSJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-15_13,2021-12-14_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_outbound_notspam policy=fb_outbound score=0 priorityscore=1501 phishscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 mlxscore=0 adultscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112150123 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds support to io_uring for the fsetxattr and setxattr API. Signed-off-by: Stefan Roesch Reviewed-by: Pavel Begunkov --- fs/io_uring.c | 171 ++++++++++++++++++++++++++++++++++ include/uapi/linux/io_uring.h | 6 +- 2 files changed, 176 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 5092dfe56da6..fc2239635342 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -82,6 +82,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -719,6 +720,13 @@ struct io_async_rw { struct wait_page_queue wpq; }; +struct io_xattr { + struct file *file; + struct xattr_ctx ctx; + void *value; + struct filename *filename; +}; + enum { REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, @@ -858,6 +866,7 @@ struct io_kiocb { struct io_mkdir mkdir; struct io_symlink symlink; struct io_hardlink hardlink; + struct io_xattr xattr; }; u8 opcode; @@ -1107,6 +1116,10 @@ static const struct io_op_def io_op_defs[] = { [IORING_OP_MKDIRAT] = {}, [IORING_OP_SYMLINKAT] = {}, [IORING_OP_LINKAT] = {}, + [IORING_OP_FSETXATTR] = { + .needs_file = 1 + }, + [IORING_OP_SETXATTR] = {}, }; /* requests with any of those set should undergo io_disarm_next() */ @@ -3876,6 +3889,144 @@ static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) return 0; } +static int __io_setxattr_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe, + struct user_namespace *user_ns) +{ + struct io_xattr *ix = &req->xattr; + const char __user *name; + void *ret; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->ioprio)) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + ix->filename = NULL; + name = u64_to_user_ptr(READ_ONCE(sqe->addr)); + ix->ctx.value = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + ix->ctx.size = READ_ONCE(sqe->len); + ix->ctx.flags = READ_ONCE(sqe->xattr_flags); + + ix->ctx.kname = kmalloc(XATTR_NAME_MAX + 1, GFP_KERNEL); + if (!ix->ctx.kname) + return -ENOMEM; + ix->ctx.kname_sz = XATTR_NAME_MAX + 1; + + ret = setxattr_setup(user_ns, name, &ix->ctx); + if (IS_ERR(ret)) { + kfree(ix->ctx.kname); + return PTR_ERR(ret); + } + + ix->value = ret; + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_setxattr_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_xattr *ix = &req->xattr; + const char __user *path; + int ret; + + ret = __io_setxattr_prep(req, sqe, current_user_ns()); + if (ret) + return ret; + + path = u64_to_user_ptr(READ_ONCE(sqe->addr3)); + + ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL); + if (IS_ERR(ix->filename)) { + ret = PTR_ERR(ix->filename); + ix->filename = NULL; + } + + return ret; +} + +static int io_fsetxattr_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + return __io_setxattr_prep(req, sqe, file_mnt_user_ns(req->file)); +} + +static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags, + struct path *path) +{ + struct io_xattr *ix = &req->xattr; + int ret; + + ret = mnt_want_write(path->mnt); + if (!ret) { + ret = vfs_setxattr(mnt_user_ns(path->mnt), path->dentry, + ix->ctx.kname, ix->value, ix->ctx.size, + ix->ctx.flags); + mnt_drop_write(path->mnt); + } + + return ret; +} + +static int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_xattr *ix = &req->xattr; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = __io_setxattr(req, issue_flags, &req->file->f_path); + + req->flags &= ~REQ_F_NEED_CLEANUP; + kfree(ix->ctx.kname); + + if (ix->value) + kvfree(ix->value); + if (ret < 0) + req_set_fail(req); + + io_req_complete(req, ret); + return 0; +} + +static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_xattr *ix = &req->xattr; + unsigned int lookup_flags = LOOKUP_FOLLOW; + struct path path; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + +retry: + ret = do_user_path_at_empty(AT_FDCWD, ix->filename, lookup_flags, &path); + putname(ix->filename); + if (!ret) { + ret = __io_setxattr(req, issue_flags, &path); + path_put(&path); + if (retry_estale(ret, lookup_flags)) { + lookup_flags |= LOOKUP_REVAL; + goto retry; + } + } + + req->flags &= ~REQ_F_NEED_CLEANUP; + kfree(ix->ctx.kname); + + if (ix->value) + kvfree(ix->value); + if (ret < 0) + req_set_fail(req); + + io_req_complete(req, ret); + return 0; +} + static int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { @@ -6574,6 +6725,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return io_symlinkat_prep(req, sqe); case IORING_OP_LINKAT: return io_linkat_prep(req, sqe); + case IORING_OP_FSETXATTR: + return io_fsetxattr_prep(req, sqe); + case IORING_OP_SETXATTR: + return io_setxattr_prep(req, sqe); } printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", @@ -6715,6 +6870,15 @@ static void io_clean_op(struct io_kiocb *req) putname(req->hardlink.oldpath); putname(req->hardlink.newpath); break; + case IORING_OP_SETXATTR: + if (req->xattr.filename) + putname(req->xattr.filename); + fallthrough; + case IORING_OP_FSETXATTR: + kfree(req->xattr.ctx.kname); + if (req->xattr.value) + kvfree(req->xattr.value); + break; } } if ((req->flags & REQ_F_POLLED) && req->apoll) { @@ -6857,6 +7021,12 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) case IORING_OP_LINKAT: ret = io_linkat(req, issue_flags); break; + case IORING_OP_FSETXATTR: + ret = io_fsetxattr(req, issue_flags); + break; + case IORING_OP_SETXATTR: + ret = io_setxattr(req, issue_flags); + break; default: ret = -EINVAL; break; @@ -11225,6 +11395,7 @@ static int __init io_uring_init(void) BUILD_BUG_SQE_ELEM(42, __u16, personality); BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); BUILD_BUG_SQE_ELEM(44, __u32, file_index); + BUILD_BUG_SQE_ELEM(48, __u64, addr3); BUILD_BUG_ON(sizeof(struct io_uring_files_update) != sizeof(struct io_uring_rsrc_update)); diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 787f491f0d2a..dbf473900da2 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -45,6 +45,7 @@ struct io_uring_sqe { __u32 rename_flags; __u32 unlink_flags; __u32 hardlink_flags; + __u32 xattr_flags; }; __u64 user_data; /* data to be passed back at completion time */ /* pack this to avoid bogus arm OABI complaints */ @@ -60,7 +61,8 @@ struct io_uring_sqe { __s32 splice_fd_in; __u32 file_index; }; - __u64 __pad2[2]; + __u64 addr3; + __u64 __pad2[1]; }; enum { @@ -143,6 +145,8 @@ enum { IORING_OP_MKDIRAT, IORING_OP_SYMLINKAT, IORING_OP_LINKAT, + IORING_OP_FSETXATTR, + IORING_OP_SETXATTR, /* this goes last, obviously */ IORING_OP_LAST,