hi there
I've found and fixed a vblade (v20) bug which manifests itself in the following
situation:
- vblade host uses a big-endian processor (in our case, a POWER4).
- exported volume has > 128GB (requires LBA48).
The AoE client (in our case, Linux 2.6.32) ignores/gets_confused_with the
LBA48 data and considers the LBA28 only, cropping the volume size to
MAXLBA28SIZE-1. Some erratic behavior may happen: some partitions do not
appear, unable to access root device etc.
dmesg under Linux returns something like this:
[5278516.938160] aoe: 00a1b0691845 e4.4 v4014 has 268435455 sectors
[5278516.938216] etherd/e4.4: p1 p2 < >
[5278516.938995] etherd/e4.4: p1 size 273874944 exceeds device capacity,
limited to end of disk
[5278516.939018] etherd/e4.4: p2 ignored, start 273879038 is behind the end of
the disk
.dan
Following, the patch against vblade-20:
---------------------------------------
diff -Nurp vblade-20/ata.c vblade-20_fixed_for_MSB_arch//ata.c
--- vblade-20/ata.c 2009-08-14 15:33:09.000000000 -0300
+++ vblade-20_fixed_for_MSB_arch//ata.c 2013-03-04 17:39:44.000000000 -0300
@@ -23,16 +23,7 @@ enum {
ERR = 1<<0,
};
-static ushort ident[256] = {
- [47] 0x8000,
- [49] 0x0200,
- [50] 0x4000,
- [83] 0x5400,
- [84] 0x4000,
- [86] 0x1400,
- [87] 0x4000,
- [93] 0x400b,
-};
+static ushort ident[256];
static void
setfld(ushort *a, int idx, int len, char *str) // set field in ident
@@ -79,6 +70,16 @@ setlba48(ushort *ident, vlong lba)
*cp++ = lba >>= 8;
*cp++ = lba >>= 8;
}
+
+static void
+setushort(ushort *a, int idx, ushort x)
+{
+ uchar *cp;
+
+ cp = (uchar *)(a+idx);
+ *cp++ = x & 0xff;
+ *cp++ = x >> 8;
+}
void
atainit(void)
@@ -89,6 +90,15 @@ atainit(void)
sprintf(buf, "V%d", VBLADE_VERSION);
setfld(ident, 23, 8, buf);
setfld(ident, 10, 20, serial);
+
+ setushort(ident, 47, 0x8000);
+ setushort(ident, 49, 0x0200);
+ setushort(ident, 50, 0x4000);
+ setushort(ident, 83, 0x5400);
+ setushort(ident, 84, 0x4000);
+ setushort(ident, 86, 0x1400);
+ setushort(ident, 87, 0x4000);
+ setushort(ident, 93, 0x400b);
}
---------------------------------------
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