[mdadm PATCH] mdopen: call "modprobe md_mod" if it might be needed.

[NeilBrown <neilb@suse.com>]

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Creating an array by opening a block-device with major number of 9
will transparently load the md module if needed.
Creating an array by opening
   /sys/module/md_mod/parameters/new_array
and writing to it won't, it will just fail if md_mod isn't loaded.

So when opening that file fails with ENOENT, run "modprobe md_mod" and
try again.

This fixes a bug whereby if you have "CREATE names=yes" in mdadm.conf,
and the md modules isn't loaded, then creating or assembling an
array will not honor the "names=yes" configuration.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 mdopen.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mdopen.c b/mdopen.c
index 3c0052f2db23..dcdc6f23e6c1 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -312,6 +312,10 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 		if (block_udev)
 			udev_block(devnm);
 		fd = open("/sys/module/md_mod/parameters/new_array", O_WRONLY);
+		if (fd < 0 && errno == ENOENT) {
+			system("modprobe md_mod");
+			fd = open("/sys/module/md_mod/parameters/new_array", O_WRONLY);
+		}
 		if (fd >= 0) {
 			n = write(fd, devnm, strlen(devnm));
 			close(fd);
-- 
2.14.0.rc0.dirty


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