diff options
Diffstat (limited to 'sys/fs/nullfs/null_vnops.c')
| -rw-r--r-- | sys/fs/nullfs/null_vnops.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index 8608216e10e5..74c1a8f3acb6 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -190,6 +190,26 @@ SYSCTL_INT(_debug, OID_AUTO, nullfs_bug_bypass, CTLFLAG_RW, &null_bug_bypass, 0, ""); /* + * Synchronize inotify flags with the lower vnode: + * - If the upper vnode has the flag set and the lower does not, then the lower + * vnode is unwatched and the upper vnode does not need to go through + * VOP_INOTIFY. + * - If the lower vnode is watched, then the upper vnode should go through + * VOP_INOTIFY, so copy the flag up. + */ +static void +null_copy_inotify(struct vnode *vp, struct vnode *lvp, short flag) +{ + if ((vn_irflag_read(vp) & flag) != 0) { + if (__predict_false((vn_irflag_read(lvp) & flag) == 0)) + vn_irflag_unset(vp, flag); + } else if ((vn_irflag_read(lvp) & flag) != 0) { + if (__predict_false((vn_irflag_read(vp) & flag) == 0)) + vn_irflag_set(vp, flag); + } +} + +/* * This is the 10-Apr-92 bypass routine. * This version has been optimized for speed, throwing away some * safety checks. It should still always work, but it's not as @@ -305,7 +325,10 @@ null_bypass(struct vop_generic_args *ap) lvp = *(vps_p[i]); /* - * Get rid of the transient hold on lvp. + * Get rid of the transient hold on lvp. Copy inotify + * flags up in case something is watching the lower + * layer. + * * If lowervp was unlocked during VOP * operation, nullfs upper vnode could have * been reclaimed, which changes its v_vnlock @@ -314,6 +337,10 @@ null_bypass(struct vop_generic_args *ap) * upper (reclaimed) vnode. */ if (lvp != NULLVP) { + null_copy_inotify(old_vps[i], lvp, + VIRF_INOTIFY); + null_copy_inotify(old_vps[i], lvp, + VIRF_INOTIFY_PARENT); if (VOP_ISLOCKED(lvp) == LK_EXCLUSIVE && old_vps[i]->v_vnlock != lvp->v_vnlock) { VOP_UNLOCK(lvp); |