Bug#442874: mdadm: --write-mostly does nothing if device is re-added using --add

[Neil Brown]

Thanks for the bug report.

This is now fixed in the upstream .git by the following patch.

It highlights the fact that while you can turn on the write-mostly
bit, you cannot easily turn it off.  I wonder if that is a problem.

NeilBrown


### Diffstat output
 ./Manage.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff .prev/Manage.c ./Manage.c
--- .prev/Manage.c	2007-08-10 13:36:18.000000000 +1000
+++ ./Manage.c	2007-09-24 13:09:09.000000000 +1000
@@ -395,6 +395,8 @@ int Manage_subdevs(char *devname, int fd
 						disc.number = mdi.disk.number;
 						disc.raid_disk = mdi.disk.raid_disk;
 						disc.state = mdi.disk.state;
+						if (dv->writemostly)
+							disk.state |= 1 << MD_DISK_WRITEMOSTLY;
 						if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
 							if (verbose >= 0)
 								fprintf(stderr, Name ": re-added %s\n", dv->devname);