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Index: sys/kern/kern_vnodedumper.c
===================================================================
--- sys/kern/kern_vnodedumper.c
+++ sys/kern/kern_vnodedumper.c
@@ -60,6 +60,37 @@
EVENTHANDLER_DECLARE(livedumper_dump, livedump_dump_fn);
EVENTHANDLER_DECLARE(livedumper_finish, livedump_fn);
+static uint8_t livedump_comp = KERNELDUMP_COMP_NONE;
+
+static int
+livedump_set_compression(SYSCTL_HANDLER_ARGS)
+{
+ int error;
+ uint8_t comp;
+
+ comp = livedump_comp;
+ error = sysctl_handle_8(oidp, &comp, 0, req);
+ if (error != 0 || req->newptr == NULL)
+ return (error);
+
+ switch (comp) {
+ case KERNELDUMP_COMP_NONE:
+ case KERNELDUMP_COMP_GZIP:
+ case KERNELDUMP_COMP_ZSTD:
+ livedump_comp = comp;
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ return (error);
+}
+SYSCTL_PROC(_kern, OID_AUTO, livedump_compression,
+ CTLTYPE_U8 | CTLFLAG_RW | CTLFLAG_CAPRW, NULL, 0,
+ livedump_set_compression, "U8",
+ "Compression to apply for kern.livedump");
+
/*
* Invoke a live minidump on the system.
*/
@@ -67,7 +98,8 @@
sysctl_live_dump(SYSCTL_HANDLER_ARGS)
{
#if MINIDUMP_PAGE_TRACKING == 1
- struct dumperinfo di;
+ struct diocskerneldump_arg kda;
+ struct dumperinfo di, *livedi;
struct vnode *vp;
struct file *fp;
void *rl_cookie;
@@ -96,6 +128,12 @@
di.mediaoffset = 0;
di.priv = vp; /* To be used by callback functions. */
+ bzero(&kda, sizeof(kda));
+ kda.kda_compression = livedump_comp;
+ error = dumper_create(&di, "livedump", &kda, &livedi);
+ if (error != 0)
+ return (error);
+
/* Lock the vnode and the entire file range. */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
@@ -108,13 +146,14 @@
goto out;
dump_savectx();
- error = minidumpsys(&di, true);
+ error = minidumpsys(livedi, true);
/* XXX: may clobber error. */
EVENTHANDLER_INVOKE(livedumper_finish, &error);
out:
sx_xunlock(&livedump_sx);
vn_rangelock_unlock(vp, rl_cookie);
VOP_UNLOCK(vp);
+ dumper_destroy(livedi);
return (error);
#else
return (EOPNOTSUPP);

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