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- Allow to specify the byte which will be used for filling read buffer.

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- Improve sysctl description a bit.

Submitted by:	Ivan Voras <ivoras@gmail.com>
This commit is contained in:
Pawel Jakub Dawidek 2005-12-08 23:06:59 +00:00
parent df3d5a19fc
commit 24e1fdcd1a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=153251
1 changed files with 7 additions and 4 deletions
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11
sys/geom/zero/g_zero.c
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@ -42,9 +42,12 @@
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, zero, CTLFLAG_RW, 0, "GEOM_ZERO stuff");
static u_int g_zero_clear = 1;
SYSCTL_UINT(_kern_geom_zero, OID_AUTO, clear, CTLFLAG_RW, &g_zero_clear, 0,
"Zero-fill bio_data.");
static int g_zero_clear = 1;
SYSCTL_INT(_kern_geom_zero, OID_AUTO, clear, CTLFLAG_RW, &g_zero_clear, 0,
"Clear read data buffer");
static int g_zero_byte = 0;
SYSCTL_INT(_kern_geom_zero, OID_AUTO, byte, CTLFLAG_RW, &g_zero_byte, 0,
"Byte (octet) value to clear the buffers with");
static void
g_zero_start(struct bio *bp)
@ -54,7 +57,7 @@ g_zero_start(struct bio *bp)
switch (bp->bio_cmd) {
case BIO_READ:
if (g_zero_clear)
bzero(bp->bio_data, bp->bio_length);
memset(bp->bio_data, g_zero_byte, bp->bio_length);
/* FALLTHROUGH */
case BIO_DELETE:
case BIO_WRITE: