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Subject[RFC][PATCH 1/3] vfs: add FALLOC_FL_NO_HIDE_STALE flag in fallocate
Date
From: Zheng Liu <wenqing.lz@taobao.com>

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

Signed-off-by: Zheng Liu <wenqing.lz@taobao.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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