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diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -37,7 +37,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 6, 2020
+.Dd August 27, 2021
.Dt MDCONFIG 8
.Os
.Sh NAME
@@ -246,6 +246,34 @@
flag to forcibly destroy an
.Xr md 4
disk that is still in use.
+.It Oo Cm no Oc Ns Cm mustdealloc
+For
+.Cm vnode
+backed devices: detect whether hole-punching is supported by the underlying file
+system.
+If the file system supports hole-punching, then to handle a
+.Dv BIO_DELETE
+request, some or all of the request's operation range may be turned into a hole
+in the file used for backing store.
+Any parts which are not turned into holes are zero-filled in
+the file.
+If the file system does not support
+hole-punching,
+.Dv BIO_DELETE
+requests to the device are not handled and will fail with
+.Er EOPNOTSUPP .
+.Pp
+When
+.Cm mustdealloc
+is not specified or
+.Oo Cm no Oc Ns Cm mustdealloc
+is specified, for a
+.Dv BIO_DELETE
+request, if the file system supports hole-punching, some or all of the request's
+operation range may be turned into a hole in the file used for backing store.
+Any parts which are not turned into holes are zero-filled in the file.
+If the file system of the vnode type memory disk does not support hole-punching,
+the request's operation range is zero-filled in the file.
.It Oo Cm no Oc Ns Cm readonly
Enable/disable readonly mode.
.It Oo Cm no Oc Ns Cm verify
@@ -339,12 +367,15 @@
mount /dev/md1.nop /mnt
.Ed
.Sh SEE ALSO
+.Xr fpathconf 2 ,
+.Xr fspacectl 2 ,
.Xr open 2 ,
.Xr md 4 ,
.Xr ffs 7 ,
.Xr gpart 8 ,
.Xr mdmfs 8 ,
-.Xr malloc 9
+.Xr malloc 9 ,
+.Xr vn_deallocate 9
.Sh HISTORY
The
.Nm
diff --git a/sbin/mdconfig/mdconfig.c b/sbin/mdconfig/mdconfig.c
--- a/sbin/mdconfig/mdconfig.c
+++ b/sbin/mdconfig/mdconfig.c
@@ -89,7 +89,8 @@
" mdconfig file\n");
fprintf(stderr, "\t\ttype = {malloc, vnode, swap}\n");
fprintf(stderr, "\t\toption = {cache, cluster, compress, force,\n");
- fprintf(stderr, "\t\t readonly, reserve, ro, verify}\n");
+ fprintf(stderr, "\t\t mustdealloc, readonly, reserve, ro,\n");
+ fprintf(stderr, "\t\t verify}\n");
fprintf(stderr, "\t\tsize = %%d (512 byte blocks), %%db (B),\n");
fprintf(stderr, "\t\t %%dk (kB), %%dm (MB), %%dg (GB), \n");
fprintf(stderr, "\t\t %%dt (TB), or %%dp (PB)\n");
@@ -194,6 +195,10 @@
mdio.md_options |= MD_FORCE;
else if (!strcmp(optarg, "noforce"))
mdio.md_options &= ~MD_FORCE;
+ else if (!strcmp(optarg, "mustdealloc"))
+ mdio.md_options |= MD_MUSTDEALLOC;
+ else if (!strcmp(optarg, "nomustdealloc"))
+ mdio.md_options &= ~MD_MUSTDEALLOC;
else if (!strcmp(optarg, "readonly"))
mdio.md_options |= MD_READONLY;
else if (!strcmp(optarg, "noreadonly"))
diff --git a/sys/dev/md/md.c b/sys/dev/md/md.c
--- a/sys/dev/md/md.c
+++ b/sys/dev/md/md.c
@@ -90,6 +90,7 @@
#include <sys/sf_buf.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
+#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/disk.h>
@@ -259,6 +260,7 @@
struct g_provider *pp;
int (*start)(struct md_s *sc, struct bio *bp);
struct devstat *devstat;
+ bool candelete;
/* MD_MALLOC related fields */
struct indir *indir;
@@ -885,9 +887,12 @@
case BIO_WRITE:
auio.uio_rw = UIO_WRITE;
break;
- case BIO_DELETE:
case BIO_FLUSH:
break;
+ case BIO_DELETE:
+ if (sc->candelete)
+ break;
+ /* FALLTHROUGH */
default:
return (EOPNOTSUPP);
}
@@ -1176,7 +1181,7 @@
(g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 ||
g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0))
return;
- if (g_handleattr_int(bp, "GEOM::candelete", 1) != 0)
+ if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0)
return;
if (sc->ident[0] != '\0' &&
g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0)
@@ -1405,6 +1410,7 @@
struct nameidata nd;
char *fname;
int error, flags;
+ long v;
fname = mdr->md_file;
if (mdr->md_file_seg == UIO_USERSPACE) {
@@ -1434,6 +1440,13 @@
error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
if (error != 0)
goto bad;
+ if ((mdr->md_options & MD_MUSTDEALLOC) != 0) {
+ error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v);
+ if (error != 0)
+ goto bad;
+ if (v == 0)
+ sc->candelete = false;
+ }
if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
if (VN_IS_DOOMED(nd.ni_vp)) {
@@ -1690,6 +1703,7 @@
mdr->md_unit = sc->unit;
sc->mediasize = mdr->md_mediasize;
sc->sectorsize = sectsize;
+ sc->candelete = true;
error = EDOOFUS;
switch (sc->type) {
case MD_MALLOC:
diff --git a/sys/sys/mdioctl.h b/sys/sys/mdioctl.h
--- a/sys/sys/mdioctl.h
+++ b/sys/sys/mdioctl.h
@@ -92,5 +92,6 @@
#define MD_ASYNC 0x40 /* Asynchronous mode */
#define MD_VERIFY 0x80 /* Open file with O_VERIFY (vnode only) */
#define MD_CACHE 0x100 /* Cache vnode data */
+#define MD_MUSTDEALLOC 0x200 /* BIO_DELETE only if dealloc is available */
#endif /* _SYS_MDIOCTL_H_*/

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