[PATCH v8 02/19] fs: Verify write lifetime constants at compile time

Bart Van Assche
2023-12-19T00:08:23Z

The code in fs/fcntl.c converts RWH_* constants to and from WRITE_LIFE_*
constants using casts. Verify at compile time that these casts will yield
the intended effect.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
fs/fcntl.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 3ff707bf2743..f3bc4662455f 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -270,6 +270,13 @@ static int f_getowner_uids(struct file *filp, unsigned long arg)

static bool rw_hint_valid(u64 hint)
{
+ BUILD_BUG_ON(WRITE_LIFE_NOT_SET != RWH_WRITE_LIFE_NOT_SET);
+ BUILD_BUG_ON(WRITE_LIFE_NONE != RWH_WRITE_LIFE_NONE);
+ BUILD_BUG_ON(WRITE_LIFE_SHORT != RWH_WRITE_LIFE_SHORT);
+ BUILD_BUG_ON(WRITE_LIFE_MEDIUM != RWH_WRITE_LIFE_MEDIUM);
+ BUILD_BUG_ON(WRITE_LIFE_LONG != RWH_WRITE_LIFE_LONG);
+ BUILD_BUG_ON(WRITE_LIFE_EXTREME != RWH_WRITE_LIFE_EXTREME);
+
switch (hint) {