[src/trunk]: src/external/cddl/osnet/dist/uts/common/fs/zfs Fix disk geometry...

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

details:   https://anonhg.NetBSD.org/src/rev/977f09fed11b
branches:  trunk
changeset: 969738:977f09fed11b
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Sat Feb 29 17:03:33 2020 +0000

description:
Fix disk geometry calculation. Add DIOCGPARTINFO to support
getdisksize() used by other drivers, filesystems and specfs.

diffstat:

 external/cddl/osnet/dist/uts/common/fs/zfs/zvol.c |  46 ++++++++++++++++++++--
 1 files changed, 41 insertions(+), 5 deletions(-)

diffs (84 lines):

diff -r 1e59c874f888 -r 977f09fed11b external/cddl/osnet/dist/uts/common/fs/zfs/zvol.c
--- a/external/cddl/osnet/dist/uts/common/fs/zfs/zvol.c Sat Feb 29 16:59:00 2020 +0000
+++ b/external/cddl/osnet/dist/uts/common/fs/zfs/zvol.c Sat Feb 29 17:03:33 2020 +0000
@@ -72,6 +72,9 @@
 #include <sys/dnode.h>
 #include <sys/dsl_dataset.h>
 #include <sys/dsl_prop.h>
+#ifdef __NetBSD__
+#include <sys/disklabel.h>
+#endif
 #include <sys/dkio.h>
 #include <sys/byteorder.h>
 #include <sys/sunddi.h>
@@ -316,12 +319,17 @@
 #endif /* __FreeBSD__ */
 #ifdef __NetBSD__
        struct disk_geom *dg = &zv->zv_dk.dk_geom;
+       objset_t *os = zv->zv_objset;
+       spa_t *spa = dmu_objset_spa(os);
+       unsigned secsize;
 
        zv->zv_volsize = volsize;
 
+       secsize = MAX(DEV_BSIZE, 1U << spa->spa_max_ashift);
+
        memset(dg, 0, sizeof(*dg));
-       dg->dg_secsize = DEV_BSIZE; /* XXX 512? */
-       dg->dg_secperunit = zv->zv_volsize / dg->dg_secsize;;
+       dg->dg_secsize = secsize;
+       dg->dg_secperunit = volsize / secsize;
        disk_set_info(NULL, &zv->zv_dk, "ZVOL");
 #endif
 }
@@ -3589,19 +3597,47 @@
        case DIOCGWEDGEINFO:
        {
                struct dkwedge_info *dkw = (void *) arg;
-               
+               struct disk_geom *dg = &zv->zv_dk.dk_geom;
+
                memset(dkw, 0, sizeof(*dkw));
                strlcpy(dkw->dkw_devname, zv->zv_name,
                    sizeof(dkw->dkw_devname));
+
+               /*
+                * dkw_parent is interpreted as disk device name by the kernel
+                * to locate the disk driver and its geometry data. The faked
+                * name "ZFS" must never match a device name. The kernel will
+                * then call DIOCGPARTINFO below to retrieve the missing
+                * information.
+                *
+                * Userland will also be confused, but it can use the
+                * proplib based DIOCGDISKINFO to get the geometry
+                * information.
+                */
                strlcpy(dkw->dkw_parent, "ZFS", sizeof(dkw->dkw_parent));
-               
+
                dkw->dkw_offset = 0;
-               dkw->dkw_size = zv->zv_volsize / DEV_BSIZE;
+               dkw->dkw_size = dg->dg_secperunit;
                strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS);
 
                break;
        }
 
+       case DIOCGPARTINFO:
+       {
+               struct partinfo *pi = (void *) arg;
+               struct disk_geom *dg = &zv->zv_dk.dk_geom;
+
+               memset(pi, 0, sizeof(*pi));
+               pi->pi_offset = 0;
+               pi->pi_secsize = dg->dg_secsize;
+               pi->pi_size = dg->dg_secperunit;
+               pi->pi_fstype = FS_OTHER;
+               pi->pi_bsize = MAX(BLKDEV_IOSIZE, pi->pi_secsize);
+
+               break;
+       }
+
        default:
                dprintf("unknown disk_ioctl called\n");
                error = ENOTTY;