Add -fail support to --incremental

This can be used for hot-unplug.  When a device has been remove,
udev can call
   mdadm --incremental --fail sda

and mdadm will find the array holding sda and remove sda from
the array.

Based on code from  Doug Ledford <dledford@redhat.com>

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/mdadm.c b/mdadm.c
index d5e34c0..6690546 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -774,6 +774,9 @@ int main(int argc, char *argv[])
 			devmode = 'r';
 			continue;
 		case O(MANAGE,'f'): /* set faulty */
+		case O(INCREMENTAL,'f'): /* r for incremental is taken, use f
+					  * even though we will both fail and
+					  * remove the device */
 			devmode = 'f';
 			continue;
 		case O(INCREMENTAL,'R'):
@@ -1517,6 +1520,11 @@ int main(int argc, char *argv[])
 			 ": --incremental --scan meaningless without --run.\n");
 				break;
 			}
+			if (devmode == 'f') {
+				fprintf(stderr, Name
+			 ": --incremental --scan --fail not supported.\n");
+				break;
+			}
 			rv = IncrementalScan(verbose);
 		}
 		if (!devlist) {
@@ -1533,6 +1541,10 @@ int main(int argc, char *argv[])
 			rv = 1;
 			break;
 		}
+		if (devmode == 'f') {
+			rv = IncrementalRemove(devlist->devname, verbose-quiet);
+			break;
+		}
 		rv = Incremental(devlist->devname, verbose-quiet, runstop,
 				 ss, homehost, require_homehost, autof);
 		break;