Jonathan Gray wrote:
> >
> > There's one thing to add though, it looks like it happens for any file on
> > cd9660, not just dotfiles.
>
> It is worth pointing out that httpd has had trouble serving files off
> specific filesystems in the past due to kqueue issues.
>
> cd9660_vops does not currently set .vop_kqfilter, does anything change
> if you set EVENT_NOKQUEUE before running httpd?
this maybe adds kqueue to cd9660.
Index: cd9660_vnops.c
===================================================================
RCS file: /cvs/src/sys/isofs/cd9660/cd9660_vnops.c,v
retrieving revision 1.72
diff -u -p -r1.72 cd9660_vnops.c
--- cd9660_vnops.c 17 Apr 2015 04:43:20 -0000 1.72
+++ cd9660_vnops.c 8 Dec 2015 15:24:38 -0000
@@ -65,6 +65,9 @@
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/iso_rrip.h>
+int cd9660_kqfilter(void *v);
+
+
/*
* Structure for reading directories
*/
@@ -841,6 +844,7 @@ struct vops cd9660_vops = {
.vop_write = cd9660_write,
.vop_ioctl = cd9660_ioctl,
.vop_poll = cd9660_poll,
+ .vop_kqfilter = cd9660_kqfilter,
.vop_revoke = cd9660_revoke,
.vop_fsync = cd9660_fsync,
.vop_remove = cd9660_remove,
@@ -947,3 +951,103 @@ struct vops cd9660_fifovops = {
.vop_advlock = fifo_advlock,
};
#endif /* FIFO */
+
+void filt_cd9660detach(struct knote *kn);
+int filt_cd9660read(struct knote *kn, long hint);
+int filt_cd9660write(struct knote *kn, long hint);
+int filt_cd9660vnode(struct knote *kn, long hint);
+
+struct filterops cd9660read_filtops =
+ { 1, NULL, filt_cd9660detach, filt_cd9660read };
+struct filterops cd9660write_filtops =
+ { 1, NULL, filt_cd9660detach, filt_cd9660write };
+struct filterops cd9660vnode_filtops =
+ { 1, NULL, filt_cd9660detach, filt_cd9660vnode };
+
+int
+cd9660_kqfilter(void *v)
+{
+ struct vop_kqfilter_args *ap = v;
+ struct vnode *vp = ap->a_vp;
+ struct knote *kn = ap->a_kn;
+
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ kn->kn_fop = &cd9660read_filtops;
+ break;
+ case EVFILT_WRITE:
+ kn->kn_fop = &cd9660write_filtops;
+ break;
+ case EVFILT_VNODE:
+ kn->kn_fop = &cd9660vnode_filtops;
+ break;
+ default:
+ return (EINVAL);
+ }
+
+ kn->kn_hook = (caddr_t)vp;
+
+ SLIST_INSERT_HEAD(&vp->v_selectinfo.si_note, kn, kn_selnext);
+
+ return (0);
+}
+
+void
+filt_cd9660detach(struct knote *kn)
+{
+ struct vnode *vp = (struct vnode *)kn->kn_hook;
+
+ SLIST_REMOVE(&vp->v_selectinfo.si_note, kn, knote, kn_selnext);
+}
+
+int
+filt_cd9660read(struct knote *kn, long hint)
+{
+ struct vnode *vp = (struct vnode *)kn->kn_hook;
+ struct iso_node *node = VTOI(vp);
+
+ /*
+ * filesystem is gone, so set the EOF flag and schedule
+ * the knote for deletion.
+ */
+ if (hint == NOTE_REVOKE) {
+ kn->kn_flags |= (EV_EOF | EV_ONESHOT);
+ return (1);
+ }
+
+ kn->kn_data = node->i_size - kn->kn_fp->f_offset;
+ if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
+ kn->kn_fflags |= NOTE_EOF;
+ return (1);
+ }
+
+ return (kn->kn_data != 0);
+}
+
+int
+filt_cd9660write(struct knote *kn, long hint)
+{
+ /*
+ * filesystem is gone, so set the EOF flag and schedule
+ * the knote for deletion.
+ */
+ if (hint == NOTE_REVOKE) {
+ kn->kn_flags |= (EV_EOF | EV_ONESHOT);
+ return (1);
+ }
+
+ kn->kn_data = 0;
+ return (1);
+}
+
+int
+filt_cd9660vnode(struct knote *kn, long hint)
+{
+ if (kn->kn_sfflags & hint)
+ kn->kn_fflags |= hint;
+ if (hint == NOTE_REVOKE) {
+ kn->kn_flags |= EV_EOF;
+ return (1);
+ }
+ return (kn->kn_fflags != 0);
+}
