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[2/6] fs: Verify write lifetime constants at compile time

Message ID 20240131205237.3540210-3-bvanassche@acm.org (mailing list archive)
State New, archived
Headers show
Series Restore data lifetime support | expand

Commit Message

Bart Van Assche Jan. 31, 2024, 8:52 p.m. UTC 
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>
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 fs/fcntl.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

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) {
 	case RWH_WRITE_LIFE_NOT_SET:
 	case RWH_WRITE_LIFE_NONE: