The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=1d5e4020e36e1cc9e906200c9c3c784ef43d977e
commit 1d5e4020e36e1cc9e906200c9c3c784ef43d977e Author: Konstantin Belousov <[email protected]> AuthorDate: 2026-04-24 01:31:27 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2026-05-10 17:43:46 +0000 vnode: add VIRF_KNOTE flag to indicate non-empty vnode knote list. Use it instead of VN_KNLIST_EMPTY() and guard note activations with it. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D56611 --- sys/kern/vfs_subr.c | 14 ++++++++++---- sys/sys/mount.h | 12 ++++++++++-- sys/sys/vnode.h | 29 ++++++++++++----------------- 3 files changed, 32 insertions(+), 23 deletions(-) diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 48bfea2f5bf9..f46c666b115c 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -6090,7 +6090,7 @@ vop_create_post(void *ap, int rc) a = ap; dvp = a->a_dvp; vn_seqc_write_end(dvp); - if (!rc) { + if (rc == 0) { VFS_KNOTE_LOCKED(dvp, NOTE_WRITE); INOTIFY_NAME(*a->a_vpp, dvp, a->a_cnp, IN_CREATE); } @@ -6244,7 +6244,7 @@ vop_mknod_post(void *ap, int rc) a = ap; dvp = a->a_dvp; vn_seqc_write_end(dvp); - if (!rc) { + if (rc == 0) { VFS_KNOTE_LOCKED(dvp, NOTE_WRITE); INOTIFY_NAME(*a->a_vpp, dvp, a->a_cnp, IN_CREATE); } @@ -6512,7 +6512,7 @@ vop_read_pgcache_post(void *ap, int rc) { struct vop_read_pgcache_args *a = ap; - if (!rc) + if (rc == 0) VFS_KNOTE_UNLOCKED(a->a_vp, NOTE_READ); } @@ -6659,6 +6659,8 @@ vfs_knlunlock(void *arg) { struct vnode *vp = arg; + if (KNLIST_EMPTY(&vp->v_pollinfo->vpi_selinfo.si_note)) + vn_irflag_unset(vp, VIRF_KNOTE); VOP_UNLOCK(vp); } @@ -6706,7 +6708,11 @@ vfs_kqfilter(struct vop_kqfilter_args *ap) return (ENOMEM); knl = &vp->v_pollinfo->vpi_selinfo.si_note; vhold(vp); - knlist_add(knl, kn, 0); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + knlist_add(knl, kn, 1); + if ((vn_irflag_read(vp) & VIRF_KNOTE) == 0) + vn_irflag_set(vp, VIRF_KNOTE); + VOP_UNLOCK(vp); return (0); } diff --git a/sys/sys/mount.h b/sys/sys/mount.h index f99d0856f16e..480a6c16badf 100644 --- a/sys/sys/mount.h +++ b/sys/sys/mount.h @@ -952,14 +952,22 @@ vfs_statfs_t __vfs_statfs; } \ } while (0) +#include <sys/vnode.h> + #define VFS_KNOTE_LOCKED(vp, hint) do \ { \ - VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \ + if ((vn_irflag_read(vp) & VIRF_KNOTE) != 0) { \ + KNOTE_LOCKED(&vp->v_pollinfo->vpi_selinfo.si_note, \ + hint); \ + } \ } while (0) #define VFS_KNOTE_UNLOCKED(vp, hint) do \ { \ - VN_KNOTE((vp), (hint), 0); \ + if ((vn_irflag_read(vp) & VIRF_KNOTE) != 0) { \ + KNOTE_UNLOCKED(&vp->v_pollinfo->vpi_selinfo.si_note, \ + hint); \ + } \ } while (0) #include <sys/module.h> diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h index 3fd2c770cda1..d1d20778a8ec 100644 --- a/sys/sys/vnode.h +++ b/sys/sys/vnode.h @@ -224,18 +224,14 @@ _Static_assert(sizeof(struct vnode) <= 448, "vnode size crosses 448 bytes"); /* XXX: These are temporary to avoid a source sweep at this time */ #define v_object v_bufobj.bo_object -/* We don't need to lock the knlist */ -#define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL || \ - KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note)) - -#define VN_KNOTE(vp, b, a) \ - do { \ - if (!VN_KNLIST_EMPTY(vp)) \ - KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), \ - (a) | KNF_NOKQLOCK); \ - } while (0) -#define VN_KNOTE_LOCKED(vp, b) VN_KNOTE(vp, b, KNF_LISTLOCKED) -#define VN_KNOTE_UNLOCKED(vp, b) VN_KNOTE(vp, b, 0) +#define VN_KNOTE(vp, b, a) do { \ + if ((vn_irflag_read(vp) & VIRF_KNOTE) != 0) { \ + KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), \ + (a) | KNF_NOKQLOCK); \ + } \ +} while (0) +#define VN_KNOTE_LOCKED(vp, b) VN_KNOTE(vp, b, KNF_LISTLOCKED) +#define VN_KNOTE_UNLOCKED(vp, b) VN_KNOTE(vp, b, 0) /* * Vnode flags. @@ -260,6 +256,7 @@ _Static_assert(sizeof(struct vnode) <= 448, "vnode size crosses 448 bytes"); #define VIRF_INOTIFY 0x0080 /* This vnode is being watched */ #define VIRF_INOTIFY_PARENT 0x0100 /* A parent of this vnode may be being watched */ +#define VIRF_KNOTE 0x0200 /* Has knlist */ #define VI_UNUSED0 0x0001 /* unused */ #define VI_MOUNT 0x0002 /* Mount in progress */ @@ -1052,7 +1049,7 @@ void vop_rename_fail(struct vop_rename_args *ap); off_t osize, ooffset, noffset; \ \ osize = ooffset = noffset = 0; \ - if (!VN_KNLIST_EMPTY((ap)->a_vp)) { \ + if ((vn_irflag_read((ap)->a_vp) & VIRF_KNOTE) != 0) { \ error = VOP_GETATTR((ap)->a_vp, &va, (ap)->a_cred); \ if (error) \ return (error); \ @@ -1063,10 +1060,8 @@ void vop_rename_fail(struct vop_rename_args *ap); #define vop_write_post(ap, ret) \ noffset = (ap)->a_uio->uio_offset; \ if (noffset > ooffset) { \ - if (!VN_KNLIST_EMPTY((ap)->a_vp)) { \ - VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE | \ - (noffset > osize ? NOTE_EXTEND : 0)); \ - } \ + VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE | \ + (noffset > osize ? NOTE_EXTEND : 0)); \ INOTIFY((ap)->a_vp, IN_MODIFY); \ }
