From patchwork Thu Dec 24 14:14:20 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 7918081 Return-Path: X-Original-To: patchwork-linux-block@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5D1489F350 for ; Thu, 24 Dec 2015 14:19:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F327120379 for ; Thu, 24 Dec 2015 14:19:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 737B32060A for ; Thu, 24 Dec 2015 14:19:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754005AbbLXOTi (ORCPT ); Thu, 24 Dec 2015 09:19:38 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:60977 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752391AbbLXOTd (ORCPT ); Thu, 24 Dec 2015 09:19:33 -0500 Received: from p4ff2eea3.dip0.t-ipconnect.de ([79.242.238.163] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1aC6jr-0007jq-5h; Thu, 24 Dec 2015 14:19:32 +0000 From: Christoph Hellwig To: viro@zeniv.linux.org.uk, axboe@fb.com Cc: milosz@adfin.com, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH 2/6] vfs: vfs: Define new syscalls preadv2,pwritev2 Date: Thu, 24 Dec 2015 15:14:20 +0100 Message-Id: <1450966464-6847-3-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1450966464-6847-1-git-send-email-hch@lst.de> References: <1450966464-6847-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Milosz Tanski New syscalls that take an flag argument. This change does not add any specific flags. Signed-off-by: Milosz Tanski [hch: rebased on top of my kiocb changes] Signed-off-by: Christoph Hellwig --- fs/read_write.c | 162 +++++++++++++++++++++++++++++++++++++---------- include/linux/compat.h | 6 ++ include/linux/syscalls.h | 6 ++ 3 files changed, 139 insertions(+), 35 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 34a2920..caa30ac 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -856,15 +856,15 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, EXPORT_SYMBOL(vfs_writev); -SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen) +static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, int flags) { struct fd f = fdget_pos(fd); ssize_t ret = -EBADF; if (f.file) { loff_t pos = file_pos_read(f.file); - ret = vfs_readv(f.file, vec, vlen, &pos, 0); + ret = vfs_readv(f.file, vec, vlen, &pos, flags); if (ret >= 0) file_pos_write(f.file, pos); fdput_pos(f); @@ -876,15 +876,15 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, return ret; } -SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen) +static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, int flags) { struct fd f = fdget_pos(fd); ssize_t ret = -EBADF; if (f.file) { loff_t pos = file_pos_read(f.file); - ret = vfs_writev(f.file, vec, vlen, &pos, 0); + ret = vfs_writev(f.file, vec, vlen, &pos, flags); if (ret >= 0) file_pos_write(f.file, pos); fdput_pos(f); @@ -902,10 +902,9 @@ static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; } -SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) +static ssize_t do_preadv(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, loff_t pos, int flags) { - loff_t pos = pos_from_hilo(pos_h, pos_l); struct fd f; ssize_t ret = -EBADF; @@ -916,7 +915,7 @@ SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, if (f.file) { ret = -ESPIPE; if (f.file->f_mode & FMODE_PREAD) - ret = vfs_readv(f.file, vec, vlen, &pos, 0); + ret = vfs_readv(f.file, vec, vlen, &pos, flags); fdput(f); } @@ -926,10 +925,9 @@ SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, return ret; } -SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) +static ssize_t do_pwritev(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, loff_t pos, int flags) { - loff_t pos = pos_from_hilo(pos_h, pos_l); struct fd f; ssize_t ret = -EBADF; @@ -940,7 +938,7 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, if (f.file) { ret = -ESPIPE; if (f.file->f_mode & FMODE_PWRITE) - ret = vfs_writev(f.file, vec, vlen, &pos, 0); + ret = vfs_writev(f.file, vec, vlen, &pos, flags); fdput(f); } @@ -950,6 +948,58 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, return ret; } +SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen) +{ + return do_readv(fd, vec, vlen, 0); +} + +SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen) +{ + return do_writev(fd, vec, vlen, 0); +} + +SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) +{ + loff_t pos = pos_from_hilo(pos_h, pos_l); + + return do_preadv(fd, vec, vlen, pos, 0); +} + +SYSCALL_DEFINE6(preadv2, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, + int, flags) +{ + loff_t pos = pos_from_hilo(pos_h, pos_l); + + if (pos == -1) + return do_readv(fd, vec, vlen, flags); + + return do_preadv(fd, vec, vlen, pos, flags); +} + +SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) +{ + loff_t pos = pos_from_hilo(pos_h, pos_l); + + return do_pwritev(fd, vec, vlen, pos, 0); +} + +SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, + unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, + int, flags) +{ + loff_t pos = pos_from_hilo(pos_h, pos_l); + + if (pos == -1) + return do_writev(fd, vec, vlen, flags); + + return do_pwritev(fd, vec, vlen, pos, flags); +} + #ifdef CONFIG_COMPAT static ssize_t compat_do_readv_writev(int type, struct file *file, @@ -1007,7 +1057,7 @@ out: static size_t compat_readv(struct file *file, const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos) + unsigned long vlen, loff_t *pos, int flags) { ssize_t ret = -EBADF; @@ -1018,7 +1068,7 @@ static size_t compat_readv(struct file *file, if (!(file->f_mode & FMODE_CAN_READ)) goto out; - ret = compat_do_readv_writev(READ, file, vec, vlen, pos, 0); + ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags); out: if (ret > 0) @@ -1027,9 +1077,9 @@ out: return ret; } -COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, - compat_ulong_t, vlen) +static size_t do_compat_readv(compat_ulong_t fd, + const struct compat_iovec __user *vec, + compat_ulong_t vlen, int flags) { struct fd f = fdget_pos(fd); ssize_t ret; @@ -1038,16 +1088,24 @@ COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, if (!f.file) return -EBADF; pos = f.file->f_pos; - ret = compat_readv(f.file, vec, vlen, &pos); + ret = compat_readv(f.file, vec, vlen, &pos, flags); if (ret >= 0) f.file->f_pos = pos; fdput_pos(f); return ret; + +} + +COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, + const struct compat_iovec __user *,vec, + compat_ulong_t, vlen) +{ + return do_compat_readv(fd, vec, vlen, 0); } -static long __compat_sys_preadv64(unsigned long fd, +static long do_compat_preadv64(unsigned long fd, const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos) + unsigned long vlen, loff_t pos, int flags) { struct fd f; ssize_t ret; @@ -1059,7 +1117,7 @@ static long __compat_sys_preadv64(unsigned long fd, return -EBADF; ret = -ESPIPE; if (f.file->f_mode & FMODE_PREAD) - ret = compat_readv(f.file, vec, vlen, &pos); + ret = compat_readv(f.file, vec, vlen, &pos, flags); fdput(f); return ret; } @@ -1069,7 +1127,7 @@ COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos) { - return __compat_sys_preadv64(fd, vec, vlen, pos); + return do_compat_preadv64(fd, vec, vlen, pos, 0); } #endif @@ -1079,12 +1137,25 @@ COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return __compat_sys_preadv64(fd, vec, vlen, pos); + return do_compat_preadv64(fd, vec, vlen, pos, 0); +} + +COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, + const struct compat_iovec __user *,vec, + compat_ulong_t, vlen, u32, pos_low, u32, pos_high, + int, flags) +{ + loff_t pos = ((loff_t)pos_high << 32) | pos_low; + + if (pos == -1) + return do_compat_readv(fd, vec, vlen, flags); + + return do_compat_preadv64(fd, vec, vlen, pos, flags); } static size_t compat_writev(struct file *file, const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos) + unsigned long vlen, loff_t *pos, int flags) { ssize_t ret = -EBADF; @@ -1104,9 +1175,9 @@ out: return ret; } -COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, - const struct compat_iovec __user *, vec, - compat_ulong_t, vlen) +static size_t do_compat_writev(compat_ulong_t fd, + const struct compat_iovec __user* vec, + compat_ulong_t vlen, int flags) { struct fd f = fdget_pos(fd); ssize_t ret; @@ -1115,28 +1186,36 @@ COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, if (!f.file) return -EBADF; pos = f.file->f_pos; - ret = compat_writev(f.file, vec, vlen, &pos); + ret = compat_writev(f.file, vec, vlen, &pos, flags); if (ret >= 0) f.file->f_pos = pos; fdput_pos(f); return ret; } -static long __compat_sys_pwritev64(unsigned long fd, +COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, + const struct compat_iovec __user *, vec, + compat_ulong_t, vlen) +{ + return do_compat_writev(fd, vec, vlen, 0); +} + +static long do_compat_pwritev64(unsigned long fd, const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos) + unsigned long vlen, loff_t pos, int flags) { struct fd f; ssize_t ret; if (pos < 0) return -EINVAL; + f = fdget(fd); if (!f.file) return -EBADF; ret = -ESPIPE; if (f.file->f_mode & FMODE_PWRITE) - ret = compat_writev(f.file, vec, vlen, &pos); + ret = compat_writev(f.file, vec, vlen, &pos, flags); fdput(f); return ret; } @@ -1146,7 +1225,7 @@ COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos) { - return __compat_sys_pwritev64(fd, vec, vlen, pos); + return do_compat_pwritev64(fd, vec, vlen, pos, 0); } #endif @@ -1156,8 +1235,21 @@ COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return __compat_sys_pwritev64(fd, vec, vlen, pos); + return do_compat_pwritev64(fd, vec, vlen, pos, 0); +} + +COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd, + const struct compat_iovec __user *,vec, + compat_ulong_t, vlen, u32, pos_low, u32, pos_high, int, flags) +{ + loff_t pos = ((loff_t)pos_high << 32) | pos_low; + + if (pos == -1) + return do_compat_writev(fd, vec, vlen, flags); + + return do_compat_pwritev64(fd, vec, vlen, pos, flags); } + #endif static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, diff --git a/include/linux/compat.h b/include/linux/compat.h index a76c917..fe4ccd0 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -340,6 +340,12 @@ asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd, asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd, const struct compat_iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high); +asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd, + const struct compat_iovec __user *vec, + compat_ulong_t vlen, u32 pos_low, u32 pos_high, int flags); +asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd, + const struct compat_iovec __user *vec, + compat_ulong_t vlen, u32 pos_low, u32 pos_high, int flags); #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 asmlinkage long compat_sys_preadv64(unsigned long fd, diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index a156b82..c4fac0d 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -575,8 +575,14 @@ asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf, size_t count, loff_t pos); asmlinkage long sys_preadv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, unsigned long pos_l, unsigned long pos_h); +asmlinkage long sys_preadv2(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, unsigned long pos_l, unsigned long pos_h, + int flags); asmlinkage long sys_pwritev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, unsigned long pos_l, unsigned long pos_h); +asmlinkage long sys_pwritev2(unsigned long fd, const struct iovec __user *vec, + unsigned long vlen, unsigned long pos_l, unsigned long pos_h, + int flags); asmlinkage long sys_getcwd(char __user *buf, unsigned long size); asmlinkage long sys_mkdir(const char __user *pathname, umode_t mode); asmlinkage long sys_chdir(const char __user *filename);