kevent(2): Trigger notes on DOOMED vnodes

[cem]

Summary

Always wake callers who ask for events on DOOMED files.

[cem]

Also trigger notes when vnodes are reclaimed.

Limit VBAD check to poll mode (hint == 0).

[kib]

Looks fine to me. I would also added a comment explaining the hint == 0 check.

head/sys/kern/vfs_subr.c

 
 #define Malloc(foo) malloc(foo, M_UNIT, M_WAITOK | M_ZERO)
 #define Free(foo) free(foo, M_UNIT)
 
 static struct mtx unitmtx;
 
 MTX_SYSINIT(unit, &unitmtx, "unit# allocation", MTX_DEF);
 
+#ifdef UNR64_LOCKED
+uint64_t
+alloc_unr64(struct unrhdr64 *unr64)
+{
+        uint64_t item;
+
+        mtx_lock(&unitmtx);
+        item = unr64->counter++;
+        mtx_unlock(&unitmtx);
+        return (item);
+}
+#endif
+
 #else /* ...USERLAND */
 
 #include <bitstring.h>
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>

head/sys/kern/vnode_if.src

 
 #define Malloc(foo) malloc(foo, M_UNIT, M_WAITOK | M_ZERO)
 #define Free(foo) free(foo, M_UNIT)
 
 static struct mtx unitmtx;
 
 MTX_SYSINIT(unit, &unitmtx, "unit# allocation", MTX_DEF);
 
+#ifdef UNR64_LOCKED
+uint64_t
+alloc_unr64(struct unrhdr64 *unr64)
+{
+        uint64_t item;
+
+        mtx_lock(&unitmtx);
+        item = unr64->counter++;
+        mtx_unlock(&unitmtx);
+        return (item);
+}
+#endif
+
 #else /* ...USERLAND */
 
 #include <bitstring.h>
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>

head/sys/sys/vnode.h

 
 #define Malloc(foo) malloc(foo, M_UNIT, M_WAITOK | M_ZERO)
 #define Free(foo) free(foo, M_UNIT)
 
 static struct mtx unitmtx;
 
 MTX_SYSINIT(unit, &unitmtx, "unit# allocation", MTX_DEF);
 
+#ifdef UNR64_LOCKED
+uint64_t
+alloc_unr64(struct unrhdr64 *unr64)
+{
+        uint64_t item;
+
+        mtx_lock(&unitmtx);
+        item = unr64->counter++;
+        mtx_unlock(&unitmtx);
+        return (item);
+}
+#endif
+
 #else /* ...USERLAND */
 
 #include <bitstring.h>
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>