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nbd: fixes to read-only handling 

We do not need BLKROSET if the kernel supports setting flags.
Also, always do BLKROSET even for a read-write export, otherwise
the read-only state remains "sticky" after the invocation of
"qemu-nbd -r".

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit c8969eded2)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-13 10:34:17 +01:00 committed by Michael Roth
parent 382a582c1f
commit 879c264803
1 changed files with 11 additions and 12 deletions
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11
nbd.c
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@ -399,8 +399,9 @@ int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
return -serrno;
}
if (flags & NBD_FLAG_READ_ONLY) {
int read_only = 1;
if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) {
if (errno == ENOTTY) {
int read_only = (flags & NBD_FLAG_READ_ONLY) != 0;
TRACE("Setting readonly attribute");
if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
@ -408,14 +409,12 @@ int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
LOG("Failed setting read-only attribute");
return -serrno;
}
}
if (ioctl(fd, NBD_SET_FLAGS, flags) < 0
&& errno != ENOTTY) {
} else {
int serrno = errno;
LOG("Failed setting flags");
return -serrno;
}
}
TRACE("Negotiation ended");