mdmon: ensure Unix domain socket is created with safe permissions.

In the unlikely case that mdmon is started with an overly
permissive umask, we don't want to risk giving away world acccess.

All other "mkdir" and  "O_CREAT" calls in mdmon and mdadm set
a suitably restrictive permission mask.  'bind' don't take an
explicit mask so it needs an implicit one.

Reported-by: Vincent Berg <vberg@ioactive.com>
Signed-off-by: NeilBrown <neilb@suse.de>
IMSM: Add warning message when assemble spanned container

Due to several changes in code assemble with disks
spanned between different controllers can be obtained
in some cases. After IMSM container will be assembled, check HBA of
disks, and print proper warning if mismatch is detected.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
mdmon: allow prepare_update to report failure.

If 'prepare_update' fails for some reason there is little
point continuing on to 'process_update'.
For now only malloc failures are caught, but other failures
will be considered in future.

Signed-off-by: NeilBrown <neilb@suse.de>
DDF: validate metadata_update size before using it.

process_update already checks update->len, for all but
the 'magic', prepare_update doesn't at all.

So add tests to prepare_update that we don't exceed the buffer.
This will consequently protect process_update from looking
for a 'magic' which isn't there.

Reported-by: Vincent Berg <vberg@ioactive.com>
Signed-off-by: NeilBrown <neilb@suse.de>
IMSM: validate metadata_update size before using it.

Every case in prepare_update check that the size message
size is sufficient, so process_update doesn't need to check anything.

Reported-by: Vincent Berg <vberg@ioactive.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Grow: Do not try to restart if reshape is running

Grow process did not check if reshape is already started
when deciding about restarting.
Sync_action should be checked in this case, and if
reshape is running - restart flag should not be set.
Otherwise, Grow process will fail to write data to
sysfs, and reshape will not be continued.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>