[src/trunk]: src/usr.sbin/sysinst When reading an existing gpt, match the wed...

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

details:   https://anonhg.NetBSD.org/src/rev/49ae18677b18
branches:  trunk
changeset: 844114:49ae18677b18
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Aug 03 14:00:42 2019 +0000

description:
When reading an existing gpt, match the wedges already existing ons
on the parent device, so we can use them directly if we should proceed
with an unmodified partition table.

diffstat:

 usr.sbin/sysinst/gpt.c |  45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 44 insertions(+), 1 deletions(-)

diffs (71 lines):

diff -r 3e1d292b82de -r 49ae18677b18 usr.sbin/sysinst/gpt.c
--- a/usr.sbin/sysinst/gpt.c    Sat Aug 03 13:33:10 2019 +0000
+++ b/usr.sbin/sysinst/gpt.c    Sat Aug 03 14:00:42 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: gpt.c,v 1.7 2019/08/02 10:44:22 martin Exp $   */
+/*     $NetBSD: gpt.c,v 1.8 2019/08/03 14:00:42 martin Exp $   */
 
 /*
  * Copyright 2018 The NetBSD Foundation, Inc.
@@ -228,11 +228,34 @@
        }
 }
 
+/*
+ * Find the partition matching this wedge info and record that we
+ * have a wedge already.
+ */
+static void
+update_part_from_wedge_info(struct gpt_disk_partitions *parts,
+    const struct dkwedge_info *dkw)
+{
+       for (struct gpt_part_entry *p = parts->partitions; p != NULL;
+           p = p->gp_next) {
+               if (p->gp_start != dkw->dkw_offset ||
+                   (uint64_t)p->gp_size != dkw->dkw_size)
+                       continue;
+               p->gp_flags |= GPEF_WEDGE;
+               strlcpy(p->gp_dev_name, dkw->dkw_devname,
+                   sizeof p->gp_dev_name);
+               return;
+       }
+}
+
 static struct disk_partitions *
 gpt_read_from_disk(const char *dev, daddr_t start, daddr_t len)
 {
        char diskpath[MAXPATHLEN];
        int fd;
+       struct dkwedge_info *dkw;
+       struct dkwedge_list dkwl;
+       size_t bufsize, dk;
 
        assert(start == 0);
        assert(have_gpt);
@@ -384,6 +407,26 @@
 
                parts->dp.free_space -= p->gp_size;
        }
+
+       /*
+        * Check if we have any (matching/auto-configured) wedges already
+        */
+       dkw = NULL;
+       dkwl.dkwl_buf = dkw;
+       dkwl.dkwl_bufsize = 0;
+       if (ioctl(fd, DIOCLWEDGES, &dkwl) == 0) {
+               /* do not even try to deal with any races at this point */
+               bufsize = dkwl.dkwl_nwedges * sizeof(*dkw);
+               dkw = malloc(bufsize);
+               dkwl.dkwl_buf = dkw;
+               dkwl.dkwl_bufsize = bufsize;
+               if (dkw != NULL && ioctl(fd, DIOCLWEDGES, &dkwl) == 0) {
+                       for (dk = 0; dk < dkwl.dkwl_ncopied; dk++)
+                               update_part_from_wedge_info(parts, &dkw[dk]);
+               }
+               free(dkw);
+       }
+
        close(fd);
 
        return &parts->dp;