From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 7E31F7F55 for ; Mon, 16 Feb 2015 09:48:50 -0600 (CST) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay2.corp.sgi.com (Postfix) with ESMTP id 6D31A304043 for ; Mon, 16 Feb 2015 07:48:47 -0800 (PST) Received: from mail-pd0-f177.google.com (mail-pd0-f177.google.com [209.85.192.177]) by cuda.sgi.com with ESMTP id qyT2kgqRmVpeftZR (version=TLSv1 cipher=RC4-SHA bits=128 verify=NO) for ; Mon, 16 Feb 2015 07:48:46 -0800 (PST) Received: by pdev10 with SMTP id v10so36672436pde.7 for ; Mon, 16 Feb 2015 07:48:45 -0800 (PST) From: Namjae Jeon Subject: [PATCH RESEND 1/12] fs: Add support FALLOC_FL_INSERT_RANGE for fallocate Date: Tue, 17 Feb 2015 00:47:48 +0900 Message-Id: <1424101680-3301-2-git-send-email-linkinjeon@gmail.com> In-Reply-To: <1424101680-3301-1-git-send-email-linkinjeon@gmail.com> References: <1424101680-3301-1-git-send-email-linkinjeon@gmail.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: david@fromorbit.com, tytso@mit.edu Cc: linux-man@vger.kernel.org, Namjae Jeon , Namjae Jeon , linux-api@vger.kernel.org, bfoster@redhat.com, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, mtk.manpages@gmail.com, a.sangwan@samsung.com, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org From: Namjae Jeon FALLOC_FL_INSERT_RANGE command is the opposite command of FALLOC_FL_COLLAPSE_RANGE that is needed for advertisers or someone who want to add some data in the middle of file. FALLOC_FL_INSERT_RANGE will create space for writing new data within a file after shifting extents to right as given length. and this command also has same limitation as FALLOC_FL_COLLAPSE_RANGE, that is block boundary and use ftruncate(2) for crosses EOF. Signed-off-by: Namjae Jeon Signed-off-by: Ashish Sangwan Cc: Brian Foster --- fs/open.c | 8 +++++++- include/uapi/linux/falloc.h | 17 +++++++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/fs/open.c b/fs/open.c index 813be03..762fb45 100644 --- a/fs/open.c +++ b/fs/open.c @@ -232,7 +232,8 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) /* Return error if mode is not supported */ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | - FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE)) + FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | + FALLOC_FL_INSERT_RANGE)) return -EOPNOTSUPP; /* Punch hole and zero range are mutually exclusive */ @@ -250,6 +251,11 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) (mode & ~FALLOC_FL_COLLAPSE_RANGE)) return -EINVAL; + /* Insert range should only be used exclusively. */ + if ((mode & FALLOC_FL_INSERT_RANGE) && + (mode & ~FALLOC_FL_INSERT_RANGE)) + return -EINVAL; + if (!(file->f_mode & FMODE_WRITE)) return -EBADF; diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h index d1197ae..3e445a7 100644 --- a/include/uapi/linux/falloc.h +++ b/include/uapi/linux/falloc.h @@ -41,4 +41,21 @@ */ #define FALLOC_FL_ZERO_RANGE 0x10 +/* + * FALLOC_FL_INSERT_RANGE is use to insert space within the file size without + * overwriting any existing data. The contents of the file beyond offset are + * shifted towards right by len bytes to create a hole. As such, this + * operation will increase the size of the file by len bytes. + * + * Different filesystems may implement different limitations on the granularity + * of the operation. Most will limit operations to filesystem block size + * boundaries, but this boundary may be larger or smaller depending on + * the filesystem and/or the configuration of the filesystem or file. + * + * Attempting to insert space using this flag at OR beyond the end of + * the file is considered an illegal operation - just use ftruncate(2) or + * fallocate(2) with mode 0 for such type of operations. + */ +#define FALLOC_FL_INSERT_RANGE 0x20 + #endif /* _UAPI_FALLOC_H_ */ -- 1.7.9.5 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs