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nbd: Return correct error for write to read-only export

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The NBD Protocol requires that servers should send EPERM for
attempts to write (or trim) a read-only export.  We were
correct for TRIM (blk_co_discard() gave EPERM); but were
manually setting EROFS which then got mapped to EINVAL over
the wire on writes.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1459913704-19949-2-git-send-email-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2016-04-05 21:35:02 -06:00 committed by Paolo Bonzini
parent b3f3fdeb95
commit c0301fcc81
1 changed files with 1 additions and 0 deletions
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nbd/server.c
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@ -26,6 +26,7 @@ static int system_errno_to_nbd_errno(int err)
case 0:
return NBD_SUCCESS;
case EPERM:
case EROFS:
return NBD_EPERM;
case EIO:
return NBD_EIO;