[src/trunk]: src/sys/dev/dm Make sure the unit number of device-mapper device...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3f5960159406
branches:  trunk
changeset: 983162:3f5960159406
user:      hannken <hannken%NetBSD.org@localhost>
date:      Fri May 07 09:53:39 2021 +0000

description:
Make sure the unit number of device-mapper devices matches their minor number.

diffstat:

 sys/dev/dm/dm_ioctl.c |  33 ++++++++++++++++++++-------------
 1 files changed, 20 insertions(+), 13 deletions(-)

diffs (93 lines):

diff -r 75f113826dda -r 3f5960159406 sys/dev/dm/dm_ioctl.c
--- a/sys/dev/dm/dm_ioctl.c     Fri May 07 09:15:52 2021 +0000
+++ b/sys/dev/dm/dm_ioctl.c     Fri May 07 09:53:39 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: dm_ioctl.c,v 1.50 2020/07/08 15:07:13 thorpej Exp $      */
+/* $NetBSD: dm_ioctl.c,v 1.51 2021/05/07 09:53:39 hannken Exp $      */
 
 /*
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -29,7 +29,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: dm_ioctl.c,v 1.50 2020/07/08 15:07:13 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: dm_ioctl.c,v 1.51 2021/05/07 09:53:39 hannken Exp $");
 
 /*
  * Locking is used to synchronise between ioctl calls and between dm_table's
@@ -92,18 +92,12 @@
 
 #include "netbsd-dm.h"
 #include "dm.h"
+#include "ioconf.h"
 
+extern struct cfattach dm_ca;
 static uint32_t sc_minor_num;
 uint32_t dm_dev_counter;
 
-/* Generic cf_data for device-mapper driver */
-static struct cfdata dm_cfdata = {
-       .cf_name = "dm",
-       .cf_atname = "dm",
-       .cf_fstate = FSTATE_STAR,
-       .cf_unit = 0
-};
-
 #define DM_REMOVE_FLAG(flag, name) do {                                        \
        prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag);       \
        flag &= ~name;                                                  \
@@ -196,6 +190,7 @@
        int r;
        uint32_t flags;
        device_t devt;
+       cfdata_t cf;
 
        flags = 0;
        name = NULL;
@@ -214,7 +209,13 @@
                dm_dev_unbusy(dmv);
                return EEXIST;
        }
-       if ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) {
+       cf = kmem_alloc(sizeof(*cf), KM_SLEEP);
+       cf->cf_name = dm_cd.cd_name;
+       cf->cf_atname = dm_ca.ca_name;
+       cf->cf_unit = atomic_inc_32_nv(&sc_minor_num);
+       cf->cf_fstate = FSTATE_NOTFOUND;
+       if ((devt = config_attach_pseudo(cf)) == NULL) {
+               kmem_free(cf, sizeof(*cf));
                aprint_error("Unable to attach pseudo device dm/%s\n", name);
                return (ENOMEM);
        }
@@ -229,7 +230,7 @@
        if (name)
                strlcpy(dmv->name, name, DM_NAME_LEN);
 
-       dmv->minor = (uint64_t)atomic_inc_32_nv(&sc_minor_num);
+       dmv->minor = cf->cf_unit;
        dmv->flags = 0;         /* device flags are set when needed */
        dmv->ref_cnt = 0;
        dmv->event_nr = 0;
@@ -365,6 +366,8 @@
 int
 dm_dev_remove_ioctl(prop_dictionary_t dm_dict)
 {
+       int error;
+       cfdata_t cf;
        dm_dev_t *dmv;
        const char *name, *uuid;
        uint32_t flags, minor;
@@ -398,7 +401,11 @@
         * This will call dm_detach routine which will actually removes
         * device.
         */
-       return config_detach(devt, DETACH_QUIET);
+       cf = device_cfdata(devt);
+       error = config_detach(devt, DETACH_QUIET);
+       if (error == 0)
+               kmem_free(cf, sizeof(*cf));
+       return error;
 }
 
 /*