Author: kib
Date: Wed Jun 5 20:16:25 2019
New Revision: 348698
URL: https://svnweb.freebsd.org/changeset/base/348698
Log:
Manually clear text references on reclaim for nullfs and tmpfs.
Both filesystems do no use vnode_pager_dealloc() which would handle
this case otherwise. Nullfs because vnode vm_object handle never
points to nullfs vnode. Tmpfs because its vm_object is never vnode
object at all.
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/fs/nullfs/null_vnops.c
head/sys/fs/tmpfs/tmpfs_subr.c
Modified: head/sys/fs/nullfs/null_vnops.c
==============================================================================
--- head/sys/fs/nullfs/null_vnops.c Wed Jun 5 19:55:30 2019
(r348697)
+++ head/sys/fs/nullfs/null_vnops.c Wed Jun 5 20:16:25 2019
(r348698)
@@ -810,6 +810,8 @@ null_reclaim(struct vop_reclaim_args *ap)
*/
if (vp->v_writecount > 0)
VOP_ADD_WRITECOUNT(lowervp, -vp->v_writecount);
+ else if (vp->v_writecount < 0)
+ vp->v_writecount = 0;
VI_UNLOCK(vp);
Modified: head/sys/fs/tmpfs/tmpfs_subr.c
==============================================================================
--- head/sys/fs/tmpfs/tmpfs_subr.c Wed Jun 5 19:55:30 2019
(r348697)
+++ head/sys/fs/tmpfs/tmpfs_subr.c Wed Jun 5 20:16:25 2019
(r348698)
@@ -488,6 +488,8 @@ tmpfs_destroy_vobject(struct vnode *vp, vm_object_t ob
VI_LOCK(vp);
vm_object_clear_flag(obj, OBJ_TMPFS);
obj->un_pager.swp.swp_tmpfs = NULL;
+ if (vp->v_writecount < 0)
+ vp->v_writecount = 0;
VI_UNLOCK(vp);
VM_OBJECT_WUNLOCK(obj);
}
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