Add a named reference-count KPI to hold off mounting of the root filesystem.

While we wait for holds to be released, print a list of who holds us
back once per second.

Use the new KPI from GEOM instead of vfs_mount.c calling g_waitidle().

Use the new KPI also from ata.

With ATAmkIII's newbusification, ata could narrowly miss the window
and ad0 would not exist when we tried to mount root.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/dev/ata/ata-all.c b/sys/dev/ata/ata-all.c
index d2ce297..e3b27bf 100644
--- a/sys/dev/ata/ata-all.c
+++ b/sys/dev/ata/ata-all.c
@@ -81,6 +81,7 @@ int ata_wc = 1;
 
 /* local vars */
 static struct intr_config_hook *ata_delayed_attach = NULL;
+static struct root_hold_token *ata_root_hold_token;
 static int ata_dma = 1;
 static int atapi_dma = 1;
 
@@ -559,6 +560,7 @@ ata_boot_attach(void)
 	    ata_identify(ch->dev);
 	}
     }
+    root_mount_rel(ata_root_hold_token);
 }
 
 /*
@@ -814,6 +816,7 @@ ata_module_event_handler(module_t mod, int what, void *arg)
 		return EIO;
 	    }
 	    ata_delayed_attach->ich_func = (void*)ata_boot_attach;
+	    ata_root_hold_token = root_mount_hold("ATA");
 	    if (config_intrhook_establish(ata_delayed_attach) != 0) {
 		printf("ata: config_intrhook_establish failed\n");
 		free(ata_delayed_attach, M_TEMP);