Quick code read - I think that this block:
if (flags & NBD_FLAG_READ_ONLY) {
int read_only = 1;
TRACE("Setting readonly attribute");
if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
int serrno = errno;
LOG("Failed setting read-only attribute");
return -serrno;
}
}
in nbd.c should be
{
int read_only = 0;
if (flags & NBD_FLAG_READ_ONLY)
read_only = 1;
TRACE("Setting readonly attribute");
if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
int serrno = errno;
LOG("Failed setting read-only attribute");
return -serrno;
}
}
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https://bugs.launchpad.net/bugs/1077838
Title:
qemu-nbd -r -c taints device for subsequent usage, even after -d
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