[PATCH 11/22] /dev/random: flag pools that need entropy reserve

[Matt Mackall]

/dev/random  flag pools that need entropy reserve

Add flag for pools that need to leave an entropy reserve


 tiny-mpm/drivers/char/random.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -puN drivers/char/random.c~reserved-in-struct drivers/char/random.c
--- tiny/drivers/char/random.c~reserved-in-struct	2004-03-20 13:38:27.000000000 -0600
+++ tiny-mpm/drivers/char/random.c	2004-03-20 13:38:27.000000000 -0600
@@ -497,6 +497,7 @@ struct entropy_store {
 	unsigned add_ptr;
 	int entropy_count;
 	int input_rotate;
+	int reserved;
 	struct poolinfo *poolinfo;
 	spinlock_t lock;
 	__u32 pool[0];
@@ -1277,13 +1278,14 @@ static inline void xfer_secondary_pool(s
 	if (r->entropy_count < nbytes * 8 &&
 	    r->entropy_count < r->poolinfo->POOLBITS) {
 		int bytes = min_t(int, nbytes, TMP_BUF_SIZE);
+		int reserved = r->reserved ? random_read_wakeup_thresh/4 : 0;
 
 		DEBUG_ENT("going to reseed %s with %d bits "
 			  "(%d of %d requested)\n", r->name,
 			  bytes * 8, nbytes * 8, r->entropy_count);
 
 		bytes=extract_entropy(input_pool, tmp, bytes,
-				      random_read_wakeup_thresh / 8, 0,
+				      random_read_wakeup_thresh/8, reserved,
 				      EXTRACT_ENTROPY_LIMIT);
 		add_entropy_words(r, tmp, bytes);
 		credit_entropy_store(r, bytes*8);

_
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