From: Suresh Jayaraman Subject: [PATCH] [RESEND] nfs: add support for splice writes Date: Mon, 25 May 2009 12:32:08 +0530 Message-ID: <4A1A4270.2020207@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: linux-nfs@vger.kernel.org To: Trond Myklebust Return-path: Received: from victor.provo.novell.com ([137.65.250.26]:43651 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbZEYHCN (ORCPT ); Mon, 25 May 2009 03:02:13 -0400 Sender: linux-nfs-owner@vger.kernel.org List-ID: Adds support for splice writes. It effectively calls generic_file_splice_write() to do the writes. We need not worry about O_APPEND case as the combination of splice() writes and O_APPEND is disallowed. This patch propagates NFS write errors back to the caller. The number of bytes written via splice are being added to NFSIO_NORMALWRITTENBYTES as these are effectively cached writes. Signed-off-by: Suresh Jayaraman --- fs/nfs/file.c | 31 +++++++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index ec7e27d..3f80c5e 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -48,6 +48,9 @@ static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, size_t count, unsigned int flags); static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, unsigned long nr_segs, loff_t pos); +static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, + struct file *filp, loff_t *ppos, + size_t count, unsigned int flags); static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, unsigned long nr_segs, loff_t pos); static int nfs_file_flush(struct file *, fl_owner_t id); @@ -73,6 +76,7 @@ const struct file_operations nfs_file_operations = { .lock = nfs_lock, .flock = nfs_flock, .splice_read = nfs_file_splice_read, + .splice_write = nfs_file_splice_write, .check_flags = nfs_check_flags, .setlease = nfs_setlease, }; @@ -587,6 +591,33 @@ out_swapfile: goto out; } +static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, + struct file *filp, loff_t *ppos, + size_t count, unsigned int flags) +{ + struct dentry *dentry = filp->f_path.dentry; + struct inode *inode = dentry->d_inode; + ssize_t ret; + + dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + (unsigned long) count, (unsigned long long) *ppos); + + /* + * The combination of splice and an O_APPEND destination is disallowed. + */ + + nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); + + ret = generic_file_splice_write(pipe, filp, ppos, count, flags); + if (ret >= 0 && nfs_need_sync_write(filp, inode)) { + int err = nfs_do_fsync(nfs_file_open_context(filp), inode); + if (err < 0) + ret = err; + } + return ret; +} + static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) { struct inode *inode = filp->f_mapping->host;