linux-kernel - [RFC][PATCH 1/3] vfs: add FALLOC_FL_NO_HIDE

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Message-Id: <1334681618-9452-2-git-send-email-wenqing.lz@taobao.com>
Date:	Wed, 18 Apr 2012 00:53:36 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Cc:	Zheng Liu <wenqing.lz@...bao.com>
Subject: [RFC][PATCH 1/3] vfs: add FALLOC_FL_NO_HIDE_STALE flag in fallocate

From: Zheng Liu <wenqing.lz@...bao.com>

FALLOC_FL_NO_HIDE_STALE flag is defined in fallocate for avoiding a
uninitialized->initialized conversion.

Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
 fs/open.c              |    2 +-
 include/linux/falloc.h |    5 +++++
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index 5720854..1d3117f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -223,7 +223,7 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 		return -EINVAL;
 
 	/* Return error if mode is not supported */
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+	if (mode & ~FALLOC_FL_SUPPORTED_FLAGS)
 		return -EOPNOTSUPP;
 
 	/* Punch hole must have keep size set */
diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index 73e0b62..0d5d5aa 100644
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -3,6 +3,11 @@
 
 #define FALLOC_FL_KEEP_SIZE	0x01 /* default is extend size */
 #define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */
+#define FALLOC_FL_NO_HIDE_STALE	0x04 /* no stale allocation */
+
+#define FALLOC_FL_SUPPORTED_FLAGS (FALLOC_FL_KEEP_SIZE | \
+				    FALLOC_FL_PUNCH_HOLE | \
+				    FALLOC_FL_NO_HIDE_STALE)
 
 #ifdef __KERNEL__
 
-- 
1.7.4.1

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