From patchwork Thu Mar 3 15:03:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 8493471 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 ED46E9F38C for ; Thu, 3 Mar 2016 15:04:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 18CC320270 for ; Thu, 3 Mar 2016 15:04:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A9B52034E for ; Thu, 3 Mar 2016 15:04:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757562AbcCCPE1 (ORCPT ); Thu, 3 Mar 2016 10:04:27 -0500 Received: from casper.infradead.org ([85.118.1.10]:41431 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752787AbcCCPEO (ORCPT ); Thu, 3 Mar 2016 10:04:14 -0500 Received: from chello080109146114.tirol.surfer.at ([80.109.146.114] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.85 #2 (Red Hat Linux)) id 1abUnQ-0007IQ-IT; Thu, 03 Mar 2016 15:04:08 +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 1/6] vfs: pass a flags argument to vfs_readv/vfs_writev Date: Thu, 3 Mar 2016 16:03:58 +0100 Message-Id: <1457017443-17662-2-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1457017443-17662-1-git-send-email-hch@lst.de> References: <1457017443-17662-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.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 This way we can set kiocb flags also from the sync read/write path for the read_iter/write_iter operations. For now there is no way to pass flags to plain read/write operations as there is no real need for that, and all flags passed are explicitly rejected for these files. Signed-off-by: Milosz Tanski [hch: rebased on top of my kiocb changes] Signed-off-by: Christoph Hellwig Reviewed-by: Stephen Bates Tested-by: Stephen Bates Acked-by: Jeff Moyer --- fs/nfsd/vfs.c | 4 ++-- fs/read_write.c | 44 ++++++++++++++++++++++++++------------------ fs/splice.c | 2 +- include/linux/fs.h | 4 ++-- 4 files changed, 31 insertions(+), 23 deletions(-) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 5d2a57e..d40010e 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -870,7 +870,7 @@ __be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen, oldfs = get_fs(); set_fs(KERNEL_DS); - host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); + host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0); set_fs(oldfs); return nfsd_finish_read(file, count, host_err); } @@ -957,7 +957,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, /* Write the data. */ oldfs = get_fs(); set_fs(KERNEL_DS); - host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos); + host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, 0); set_fs(oldfs); if (host_err < 0) goto out_nfserr; diff --git a/fs/read_write.c b/fs/read_write.c index dadf24e..3b7577d 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -693,11 +693,14 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) EXPORT_SYMBOL(iov_shorten); static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, - loff_t *ppos, iter_fn_t fn) + loff_t *ppos, iter_fn_t fn, int flags) { struct kiocb kiocb; ssize_t ret; + if (flags) + return -EOPNOTSUPP; + init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; @@ -709,10 +712,13 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, /* Do it by hand, with file-ops */ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, - loff_t *ppos, io_fn_t fn) + loff_t *ppos, io_fn_t fn, int flags) { ssize_t ret = 0; + if (flags) + return -EOPNOTSUPP; + while (iov_iter_count(iter)) { struct iovec iovec = iov_iter_iovec(iter); ssize_t nr; @@ -813,7 +819,8 @@ out: static ssize_t do_readv_writev(int type, struct file *file, const struct iovec __user * uvector, - unsigned long nr_segs, loff_t *pos) + unsigned long nr_segs, loff_t *pos, + int flags) { size_t tot_len; struct iovec iovstack[UIO_FASTIOV]; @@ -845,9 +852,9 @@ static ssize_t do_readv_writev(int type, struct file *file, } if (iter_fn) - ret = do_iter_readv_writev(file, &iter, pos, iter_fn); + ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); else - ret = do_loop_readv_writev(file, &iter, pos, fn); + ret = do_loop_readv_writev(file, &iter, pos, fn, flags); if (type != READ) file_end_write(file); @@ -864,27 +871,27 @@ out: } ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, - unsigned long vlen, loff_t *pos) + unsigned long vlen, loff_t *pos, int flags) { if (!(file->f_mode & FMODE_READ)) return -EBADF; if (!(file->f_mode & FMODE_CAN_READ)) return -EINVAL; - return do_readv_writev(READ, file, vec, vlen, pos); + return do_readv_writev(READ, file, vec, vlen, pos, flags); } EXPORT_SYMBOL(vfs_readv); ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, - unsigned long vlen, loff_t *pos) + unsigned long vlen, loff_t *pos, int flags) { if (!(file->f_mode & FMODE_WRITE)) return -EBADF; if (!(file->f_mode & FMODE_CAN_WRITE)) return -EINVAL; - return do_readv_writev(WRITE, file, vec, vlen, pos); + return do_readv_writev(WRITE, file, vec, vlen, pos, flags); } EXPORT_SYMBOL(vfs_writev); @@ -897,7 +904,7 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, if (f.file) { loff_t pos = file_pos_read(f.file); - ret = vfs_readv(f.file, vec, vlen, &pos); + ret = vfs_readv(f.file, vec, vlen, &pos, 0); if (ret >= 0) file_pos_write(f.file, pos); fdput_pos(f); @@ -917,7 +924,7 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, if (f.file) { loff_t pos = file_pos_read(f.file); - ret = vfs_writev(f.file, vec, vlen, &pos); + ret = vfs_writev(f.file, vec, vlen, &pos, 0); if (ret >= 0) file_pos_write(f.file, pos); fdput_pos(f); @@ -949,7 +956,7 @@ 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); + ret = vfs_readv(f.file, vec, vlen, &pos, 0); fdput(f); } @@ -973,7 +980,7 @@ 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); + ret = vfs_writev(f.file, vec, vlen, &pos, 0); fdput(f); } @@ -987,7 +994,8 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, static ssize_t compat_do_readv_writev(int type, struct file *file, const struct compat_iovec __user *uvector, - unsigned long nr_segs, loff_t *pos) + unsigned long nr_segs, loff_t *pos, + int flags) { compat_ssize_t tot_len; struct iovec iovstack[UIO_FASTIOV]; @@ -1019,9 +1027,9 @@ static ssize_t compat_do_readv_writev(int type, struct file *file, } if (iter_fn) - ret = do_iter_readv_writev(file, &iter, pos, iter_fn); + ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); else - ret = do_loop_readv_writev(file, &iter, pos, fn); + ret = do_loop_readv_writev(file, &iter, pos, fn, flags); if (type != READ) file_end_write(file); @@ -1050,7 +1058,7 @@ 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); + ret = compat_do_readv_writev(READ, file, vec, vlen, pos, 0); out: if (ret > 0) @@ -1127,7 +1135,7 @@ static size_t compat_writev(struct file *file, if (!(file->f_mode & FMODE_CAN_WRITE)) goto out; - ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); + ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, 0); out: if (ret > 0) diff --git a/fs/splice.c b/fs/splice.c index 82bc0d6..3dc1426 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -577,7 +577,7 @@ static ssize_t kernel_readv(struct file *file, const struct iovec *vec, old_fs = get_fs(); set_fs(get_ds()); /* The cast to a user pointer is valid due to the set_fs() */ - res = vfs_readv(file, (const struct iovec __user *)vec, vlen, &pos); + res = vfs_readv(file, (const struct iovec __user *)vec, vlen, &pos, 0); set_fs(old_fs); return res; diff --git a/include/linux/fs.h b/include/linux/fs.h index ae68100..875277a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1709,9 +1709,9 @@ extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *) extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t vfs_readv(struct file *, const struct iovec __user *, - unsigned long, loff_t *); + unsigned long, loff_t *, int); extern ssize_t vfs_writev(struct file *, const struct iovec __user *, - unsigned long, loff_t *); + unsigned long, loff_t *, int); extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, loff_t, size_t, unsigned int); extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,