tree e94748da892f0d825cb00b30c851a2d67afa4845
parent fd0e60530f10078f488fa3e9591cc7db5732989c
author Paolo Bonzini <pbonzini@redhat.com> 1431013548 +0200
committer Stefan Hajnoczi <stefanha@redhat.com> 1432283853 +0100

block: return EPERM on writes or discards to read-only devices

This is the behavior in the operating system, for example Linux's
blkdev_write_iter has the following:

        if (bdev_read_only(I_BDEV(bd_inode)))
                return -EPERM;

This does not apply to opening a device for read/write, when the
device only supports read-only operation.  In this case any of
EACCES, EPERM or EROFS is acceptable depending on why writing is
not possible.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1431013548-22492-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>