From patchwork Wed Nov 24 23:16:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12638065 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 0761EC4321E for ; Wed, 24 Nov 2021 23:17:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344081AbhKXXUb (ORCPT ); Wed, 24 Nov 2021 18:20:31 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:46316 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244496AbhKXXUZ (ORCPT ); Wed, 24 Nov 2021 18:20:25 -0500 Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AOErLFI010217 for ; Wed, 24 Nov 2021 15:17:15 -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=Qmw9RDmKktqOwowFfp8GYB59/91tIS2s2lv4YtpLFYc=; b=fPxiDwXtEgChBW0id3QKiohQ6YURZDJ2ga1pxf8VQgYCWgRLtx/S1zLKidYnBb6iwR2l XF/PzWEwDZ8/LMOcIbBAPPRfni6T0Al9zWf0ifsG4AkPfM+I6pG50N0LxVW/r0qJm2YY 1EZE03C6gbB1dBI+afH9rQqQdeuyALJdmA8= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3chqj1jwq4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 24 Nov 2021 15:17:15 -0800 Received: from intmgw001.25.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Wed, 24 Nov 2021 15:17:14 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 9E01B6DDBB78; Wed, 24 Nov 2021 15:17:10 -0800 (PST) From: Stefan Roesch To: , CC: Subject: [PATCH v2 1/3] fs: add parameter use_fpos to iterate_dir function Date: Wed, 24 Nov 2021 15:16:58 -0800 Message-ID: <20211124231700.1158521-2-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211124231700.1158521-1-shr@fb.com> References: <20211124231700.1158521-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: x73On2IJ599lDcwiZ3l7OYWCU11Di7MO X-Proofpoint-GUID: x73On2IJ599lDcwiZ3l7OYWCU11Di7MO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-24_06,2021-11-24_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 clxscore=1015 phishscore=0 spamscore=0 mlxscore=0 bulkscore=0 malwarescore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=967 suspectscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111240114 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds the use_fpos parameter to the iterate_dir function. If use_fpos is true it uses the file position in the file structure (existing behavior). If use_fpos is false, it uses the pos in the context structure. This change is required to support getdents in io_uring. Signed-off-by: Stefan Roesch --- arch/alpha/kernel/osf_sys.c | 2 +- fs/ecryptfs/file.c | 2 +- fs/exportfs/expfs.c | 2 +- fs/ksmbd/smb2pdu.c | 2 +- fs/ksmbd/vfs.c | 4 ++-- fs/nfsd/nfs4recover.c | 2 +- fs/nfsd/vfs.c | 2 +- fs/overlayfs/readdir.c | 6 +++--- fs/readdir.c | 28 ++++++++++++++++++++-------- include/linux/fs.h | 2 +- 10 files changed, 32 insertions(+), 20 deletions(-) diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 8bbeebb73cf0..bf9e6a5d65a9 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -162,7 +162,7 @@ SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd, if (!arg.file) return -EBADF; - error = iterate_dir(arg.file, &buf.ctx); + error = iterate_dir(arg.file, &buf.ctx, true); if (error >= 0) error = buf.error; if (count != buf.count) diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index 18d5b91cb573..d85e51cb9a88 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -109,7 +109,7 @@ static int ecryptfs_readdir(struct file *file, struct dir_context *ctx) .sb = inode->i_sb, }; lower_file = ecryptfs_file_to_lower(file); - rc = iterate_dir(lower_file, &buf.ctx); + rc = iterate_dir(lower_file, &buf.ctx, true); ctx->pos = buf.ctx.pos; if (rc < 0) goto out; diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 0106eba46d5a..0f303356f907 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -323,7 +323,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child) while (1) { int old_seq = buffer.sequence; - error = iterate_dir(file, &buffer.ctx); + error = iterate_dir(file, &buffer.ctx, true); if (buffer.found) { error = 0; break; diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 121f8e8c70ac..77424966b38c 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -3923,7 +3923,7 @@ int smb2_query_dir(struct ksmbd_work *work) dir_fp->readdir_data.private = &query_dir_private; set_ctx_actor(&dir_fp->readdir_data.ctx, __query_dir); - rc = iterate_dir(dir_fp->filp, &dir_fp->readdir_data.ctx); + rc = iterate_dir(dir_fp->filp, &dir_fp->readdir_data.ctx, true); if (rc == 0) restart_ctx(&dir_fp->readdir_data.ctx); if (rc == -ENOSPC) diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c index 19d36393974c..1755a2a22275 100644 --- a/fs/ksmbd/vfs.c +++ b/fs/ksmbd/vfs.c @@ -1136,7 +1136,7 @@ int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) set_ctx_actor(&readdir_data.ctx, __dir_empty); readdir_data.dirent_count = 0; - err = iterate_dir(fp->filp, &readdir_data.ctx); + err = iterate_dir(fp->filp, &readdir_data.ctx, true); if (readdir_data.dirent_count > 2) err = -ENOTEMPTY; else @@ -1186,7 +1186,7 @@ static int ksmbd_vfs_lookup_in_dir(struct path *dir, char *name, size_t namelen) if (IS_ERR(dfilp)) return PTR_ERR(dfilp); - ret = iterate_dir(dfilp, &readdir_data.ctx); + ret = iterate_dir(dfilp, &readdir_data.ctx, true); if (readdir_data.dirent_count > 0) ret = 0; fput(dfilp); diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index 6fedc49726bf..013b1a3530c9 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -307,7 +307,7 @@ nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) return status; } - status = iterate_dir(nn->rec_file, &ctx.ctx); + status = iterate_dir(nn->rec_file, &ctx.ctx, true); inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); list_for_each_entry_safe(entry, tmp, &ctx.names, list) { diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index c99857689e2c..cd7a7d783fa7 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1980,7 +1980,7 @@ static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp, buf.used = 0; buf.full = 0; - host_err = iterate_dir(file, &buf.ctx); + host_err = iterate_dir(file, &buf.ctx, true); if (buf.full) host_err = 0; diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 150fdf3bc68d..089150315942 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -306,7 +306,7 @@ static inline int ovl_dir_read(struct path *realpath, do { rdd->count = 0; rdd->err = 0; - err = iterate_dir(realfile, &rdd->ctx); + err = iterate_dir(realfile, &rdd->ctx, true); if (err >= 0) err = rdd->err; } while (!err && rdd->count); @@ -722,7 +722,7 @@ static int ovl_iterate_real(struct file *file, struct dir_context *ctx) return PTR_ERR(rdt.cache); } - err = iterate_dir(od->realfile, &rdt.ctx); + err = iterate_dir(od->realfile, &rdt.ctx, true); ctx->pos = rdt.ctx.pos; return err; @@ -753,7 +753,7 @@ static int ovl_iterate(struct file *file, struct dir_context *ctx) OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) { err = ovl_iterate_real(file, ctx); } else { - err = iterate_dir(od->realfile, ctx); + err = iterate_dir(od->realfile, ctx, true); } goto out; } diff --git a/fs/readdir.c b/fs/readdir.c index 09e8ed7d4161..8ea5b5f45a78 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -21,6 +21,7 @@ #include #include #include +#include "internal.h" #include @@ -36,8 +37,14 @@ unsafe_copy_to_user(dst, src, len, label); \ } while (0) - -int iterate_dir(struct file *file, struct dir_context *ctx) +/** + * iterate_dir - iterate over directory + * @file : pointer to file struct of directory + * @ctx : pointer to directory ctx structure + * @use_fpos: true : use file offset + * false: use pos in ctx structure + */ +int iterate_dir(struct file *file, struct dir_context *ctx, bool use_fpos) { struct inode *inode = file_inode(file); bool shared = false; @@ -60,12 +67,17 @@ int iterate_dir(struct file *file, struct dir_context *ctx) res = -ENOENT; if (!IS_DEADDIR(inode)) { - ctx->pos = file->f_pos; + if (use_fpos) + ctx->pos = file->f_pos; + if (shared) res = file->f_op->iterate_shared(file, ctx); else res = file->f_op->iterate(file, ctx); - file->f_pos = ctx->pos; + + if (use_fpos) + file->f_pos = ctx->pos; + fsnotify_access(file); file_accessed(file); } @@ -190,7 +202,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd, if (!f.file) return -EBADF; - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(f.file, &buf.ctx, true); if (buf.result) error = buf.result; @@ -283,7 +295,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd, if (!f.file) return -EBADF; - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(f.file, &buf.ctx, true); if (error >= 0) error = buf.error; if (buf.prev_reclen) { @@ -448,7 +460,7 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, if (!f.file) return -EBADF; - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(f.file, &buf.ctx, true); if (buf.result) error = buf.result; @@ -534,7 +546,7 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, if (!f.file) return -EBADF; - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(f.file, &buf.ctx, true); if (error >= 0) error = buf.error; if (buf.prev_reclen) { diff --git a/include/linux/fs.h b/include/linux/fs.h index 1cb616fc1105..ba4f49c4ac41 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3343,7 +3343,7 @@ const char *simple_get_link(struct dentry *, struct inode *, struct delayed_call *); extern const struct inode_operations simple_symlink_inode_operations; -extern int iterate_dir(struct file *, struct dir_context *); +extern int iterate_dir(struct file *file, struct dir_context *ctx, bool use_fpos); int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat, int flags); From patchwork Wed Nov 24 23:16:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12638063 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 72D2FC4167D for ; Wed, 24 Nov 2021 23:17:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344371AbhKXXUc (ORCPT ); Wed, 24 Nov 2021 18:20:32 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:48744 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343681AbhKXXU0 (ORCPT ); Wed, 24 Nov 2021 18:20:26 -0500 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AOKFBOw006437 for ; Wed, 24 Nov 2021 15:17:16 -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=q+vs1ZFstyVPwgQFZJnnJGbeqh53/HLmnSS5U5UL+Sc=; b=AZPEom5asWAX9c/EmWZT3Pen//lN+7xduWkM9DHHrnuUBfLjMVgm4XV3HYReTcQTBALu /8Y9skq/X4w9vL5AqKWklQscjuvtBfNPf4UqzhElRVdTn9elH/r5jyq58ztoEA4Smozw iV7kSYkk/ohXMFc9RWKqfEUiR7KCnjE+p+0= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3chje5vwxb-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 24 Nov 2021 15:17:16 -0800 Received: from intmgw006.03.ash8.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, 24 Nov 2021 15:17:15 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id A2BBF6DDBB7A; Wed, 24 Nov 2021 15:17:10 -0800 (PST) From: Stefan Roesch To: , CC: Subject: [PATCH v2 2/3] fs: split off vfs_getdents function of getdents64 syscall Date: Wed, 24 Nov 2021 15:16:59 -0800 Message-ID: <20211124231700.1158521-3-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211124231700.1158521-1-shr@fb.com> References: <20211124231700.1158521-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: --IDDN4Pzx3hqtYQq4P-ByxSX-9F9X7q X-Proofpoint-GUID: --IDDN4Pzx3hqtYQq4P-ByxSX-9F9X7q X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-24_06,2021-11-24_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 spamscore=0 impostorscore=0 clxscore=1015 mlxscore=0 mlxlogscore=876 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111240114 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This splits off the vfs_getdents function from the getdents64 system call. This allows io_uring to call the function. Signed-off-by: Stefan Roesch --- fs/internal.h | 8 ++++++++ fs/readdir.c | 36 ++++++++++++++++++++++++++++-------- 2 files changed, 36 insertions(+), 8 deletions(-) diff --git a/fs/internal.h b/fs/internal.h index 7979ff8d168c..355be993b9f1 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -194,3 +194,11 @@ long splice_file_to_pipe(struct file *in, struct pipe_inode_info *opipe, loff_t *offset, size_t len, unsigned int flags); + +/* + * fs/readdir.c + */ +struct linux_dirent64; + +int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent, + unsigned int count, s64 pos); diff --git a/fs/readdir.c b/fs/readdir.c index 8ea5b5f45a78..fc5b50fb160b 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -363,22 +363,26 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen, return -EFAULT; } -SYSCALL_DEFINE3(getdents64, unsigned int, fd, - struct linux_dirent64 __user *, dirent, unsigned int, count) +/** + * vfs_getdents - getdents without fdget + * @file : pointer to file struct of directory + * @dirent : pointer to user directory structure + * @count : size of buffer + * @ctx_pos : if file pos is used, pass -1, + * if ctx pos is used, pass ctx pos + */ +int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent, + unsigned int count, s64 ctx_pos) { - struct fd f; struct getdents_callback64 buf = { .ctx.actor = filldir64, + .ctx.pos = ctx_pos, .count = count, .current_dir = dirent }; int error; - f = fdget_pos(fd); - if (!f.file) - return -EBADF; - - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(file, &buf.ctx, ctx_pos < 0); if (error >= 0) error = buf.error; if (buf.prev_reclen) { @@ -391,6 +395,22 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd, else error = count - buf.count; } + + return error; +} + +SYSCALL_DEFINE3(getdents64, unsigned int, fd, + struct linux_dirent64 __user *, dirent, unsigned int, count) +{ + struct fd f; + int error; + + f = fdget_pos(fd); + if (!f.file) + return -EBADF; + + error = vfs_getdents(f.file, dirent, count, -1); + fdput_pos(f); return error; } From patchwork Wed Nov 24 23:17:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12638061 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 41AD8C43219 for ; Wed, 24 Nov 2021 23:17:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244755AbhKXXUa (ORCPT ); Wed, 24 Nov 2021 18:20:30 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:31714 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245001AbhKXXU0 (ORCPT ); Wed, 24 Nov 2021 18:20:26 -0500 Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AOErLFJ010217 for ; Wed, 24 Nov 2021 15:17:15 -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=/lEdDpzwmGU0btUNeJXsWot0VLH6GjWMAozmDGI3EAU=; b=AzsS6/Jkm4FmDo5vGM7eRhyx8JZCKzZqy6uLYX36GJ7UaNifnHAkX+itrCblzjzvKTJD gUrhWC2Y2dhwaT7zkeKeGpgyHpwpXRkZOhSWBZB2kvQP3AHhXFVlLSz59Mk+gSXFk8CM b/8B0zlwSHpu20EbFxvVzIeDTpnvN7namQ4= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3chqj1jwq4-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 24 Nov 2021 15:17:15 -0800 Received: from intmgw001.25.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Wed, 24 Nov 2021 15:17:14 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id A79F06DDBB7C; Wed, 24 Nov 2021 15:17:10 -0800 (PST) From: Stefan Roesch To: , CC: Subject: [PATCH v2 3/3] io_uring: add support for getdents64 Date: Wed, 24 Nov 2021 15:17:00 -0800 Message-ID: <20211124231700.1158521-4-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211124231700.1158521-1-shr@fb.com> References: <20211124231700.1158521-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: 7IqgPZIp1xKoqN5CvKUATiD8Bo6PaEXQ X-Proofpoint-GUID: 7IqgPZIp1xKoqN5CvKUATiD8Bo6PaEXQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-24_06,2021-11-24_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 clxscore=1015 phishscore=0 spamscore=0 mlxscore=0 bulkscore=0 malwarescore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=999 suspectscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111240114 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds support for getdents64 to io_uring. Signed-off-by: Stefan Roesch --- fs/io_uring.c | 52 +++++++++++++++++++++++++++++++++++ include/uapi/linux/io_uring.h | 1 + 2 files changed, 53 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index f666a0e7f5e8..d423050276e8 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -691,6 +691,13 @@ struct io_hardlink { int flags; }; +struct io_getdents { + struct file *file; + struct linux_dirent64 __user *dirent; + unsigned int count; + loff_t pos; +}; + struct io_async_connect { struct sockaddr_storage address; }; @@ -856,6 +863,7 @@ struct io_kiocb { struct io_mkdir mkdir; struct io_symlink symlink; struct io_hardlink hardlink; + struct io_getdents getdents; }; u8 opcode; @@ -1105,6 +1113,9 @@ static const struct io_op_def io_op_defs[] = { [IORING_OP_MKDIRAT] = {}, [IORING_OP_SYMLINKAT] = {}, [IORING_OP_LINKAT] = {}, + [IORING_OP_GETDENTS] = { + .needs_file = 1, + }, }; /* requests with any of those set should undergo io_disarm_next() */ @@ -3971,6 +3982,42 @@ static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) return 0; } +static int io_getdents_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_getdents *getdents = &req->getdents; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->rw_flags || sqe->buf_index) + return -EINVAL; + + getdents->pos = READ_ONCE(sqe->off); + getdents->dirent = u64_to_user_ptr(READ_ONCE(sqe->addr)); + getdents->count = READ_ONCE(sqe->len); + + return 0; +} + +static int io_getdents(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_getdents *getdents = &req->getdents; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = vfs_getdents(req->file, getdents->dirent, getdents->count, getdents->pos); + if (ret < 0) { + if (ret == -ERESTARTSYS) + ret = -EINTR; + + req_set_fail(req); + } + + io_req_complete(req, ret); + return 0; +} + static int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { @@ -6486,6 +6533,8 @@ 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_GETDENTS: + return io_getdents_prep(req, sqe); } printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", @@ -6768,6 +6817,9 @@ 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_GETDENTS: + ret = io_getdents(req, issue_flags); + break; default: ret = -EINVAL; break; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 787f491f0d2a..57dc88db5793 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -143,6 +143,7 @@ enum { IORING_OP_MKDIRAT, IORING_OP_SYMLINKAT, IORING_OP_LINKAT, + IORING_OP_GETDENTS, /* this goes last, obviously */ IORING_OP_LAST,