vfs: retire KERN_VNODE
It got disabled in 2003:
commit acb18acfec97aa7fe26ff48f80a5c3f89c9b542d
Author: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Sun Feb 23 18:09:05 2003 +0000
Bracket the kern.vnode sysctl in #ifdef notyet because it results
in massive locking issues on diskless systems.
It is also not clear that this sysctl is non-dangerous in its
requirements for locked down memory on large RAM systems.
There does not seem to be practical use for it and the disabled routine
does not work anyway.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D39127
This commit is contained in:
Mateusz Guzik
parent
491263d7a6
commit
62a573d953
@ -28,7 +28,7 @@
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.\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95
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.\" $FreeBSD$
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.\"
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.Dd October 18, 2021
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.Dd March 16, 2023
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.Dt SYSCTL 3
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.Os
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.Sh NAME
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@ -354,7 +354,6 @@ information.
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.It Dv KERN_SECURELVL Ta integer Ta raise only
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.It Dv KERN_UPDATEINTERVAL Ta integer Ta no
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.It Dv KERN_VERSION Ta string Ta no
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.It Dv KERN_VNODE Ta struct xvnode Ta no
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.El
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.Bl -tag -width 6n
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.It Li KERN_ARGMAX
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@ -487,14 +486,6 @@ This level may be raised by processes with appropriate privilege.
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It may not be lowered.
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.It Li KERN_VERSION
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The system version string.
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.It Li KERN_VNODE
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Return the entire vnode table.
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Note, the vnode table is not necessarily a consistent snapshot of
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the system.
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The returned data consists of an array whose size depends on the
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current number of such objects in the system.
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Each element of the array consists of a
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.Va struct xvnode .
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.El
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.Ss CTL_NET
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The string and integer information available for the CTL_NET level
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@ -111,7 +111,7 @@ oquota(struct thread *td, struct oquota_args *uap)
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#define KINFO_PROC (0<<8)
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#define KINFO_RT (1<<8)
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#define KINFO_VNODE (2<<8)
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/* UNUSED, was KINFO_VNODE (2<<8) */
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#define KINFO_FILE (3<<8)
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#define KINFO_METER (4<<8)
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#define KINFO_LOADAVG (5<<8)
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@ -184,13 +184,6 @@ ogetkerninfo(struct thread *td, struct ogetkerninfo_args *uap)
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0, 0, 0, &size, 0);
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break;
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case KINFO_VNODE:
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name[0] = CTL_KERN;
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name[1] = KERN_VNODE;
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error = userland_sysctl(td, name, 2, uap->where, uap->size,
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0, 0, 0, &size, 0);
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break;
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case KINFO_PROC:
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name[0] = CTL_KERN;
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name[1] = KERN_PROC;
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@ -4704,103 +4704,6 @@ sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
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#endif /* 1 || COMPAT_PRELITE2 */
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#endif /* !BURN_BRIDGES */
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#define KINFO_VNODESLOP 10
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#ifdef notyet
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/*
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* Dump vnode list (via sysctl).
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*/
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/* ARGSUSED */
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static int
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sysctl_vnode(SYSCTL_HANDLER_ARGS)
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{
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struct xvnode *xvn;
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struct mount *mp;
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struct vnode *vp;
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int error, len, n;
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/*
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* Stale numvnodes access is not fatal here.
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*/
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req->lock = 0;
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len = (numvnodes + KINFO_VNODESLOP) * sizeof *xvn;
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if (!req->oldptr)
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/* Make an estimate */
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return (SYSCTL_OUT(req, 0, len));
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error = sysctl_wire_old_buffer(req, 0);
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if (error != 0)
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return (error);
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xvn = malloc(len, M_TEMP, M_ZERO | M_WAITOK);
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n = 0;
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mtx_lock(&mountlist_mtx);
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TAILQ_FOREACH(mp, &mountlist, mnt_list) {
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if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK))
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continue;
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MNT_ILOCK(mp);
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TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
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if (n == len)
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break;
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vref(vp);
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xvn[n].xv_size = sizeof *xvn;
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xvn[n].xv_vnode = vp;
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xvn[n].xv_id = 0; /* XXX compat */
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#define XV_COPY(field) xvn[n].xv_##field = vp->v_##field
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XV_COPY(usecount);
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XV_COPY(writecount);
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XV_COPY(holdcnt);
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XV_COPY(mount);
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XV_COPY(numoutput);
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XV_COPY(type);
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#undef XV_COPY
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xvn[n].xv_flag = vp->v_vflag;
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switch (vp->v_type) {
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case VREG:
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case VDIR:
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case VLNK:
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break;
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case VBLK:
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case VCHR:
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if (vp->v_rdev == NULL) {
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vrele(vp);
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continue;
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}
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xvn[n].xv_dev = dev2udev(vp->v_rdev);
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break;
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case VSOCK:
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xvn[n].xv_socket = vp->v_socket;
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break;
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case VFIFO:
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xvn[n].xv_fifo = vp->v_fifoinfo;
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break;
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case VNON:
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case VBAD:
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default:
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/* shouldn't happen? */
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vrele(vp);
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continue;
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}
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vrele(vp);
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++n;
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}
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MNT_IUNLOCK(mp);
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mtx_lock(&mountlist_mtx);
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vfs_unbusy(mp);
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if (n == len)
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break;
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}
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mtx_unlock(&mountlist_mtx);
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error = SYSCTL_OUT(req, xvn, n * sizeof *xvn);
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free(xvn, M_TEMP);
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE | CTLFLAG_RD |
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CTLFLAG_MPSAFE, 0, 0, sysctl_vnode, "S,xvnode",
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"");
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#endif
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static void
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unmount_or_warn(struct mount *mp)
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{
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@ -182,7 +182,6 @@ audit_ctlname_to_sysctlevent(int name[], uint64_t valid_arg)
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case KERN_HOSTID:
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case KERN_SECURELVL:
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case KERN_HOSTNAME:
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case KERN_VNODE:
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case KERN_PROC:
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case KERN_FILE:
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case KERN_PROF:
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@ -972,7 +972,7 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
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#define KERN_HOSTNAME 10 /* string: hostname */
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#define KERN_HOSTID 11 /* int: host identifier */
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#define KERN_CLOCKRATE 12 /* struct: struct clockrate */
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#define KERN_VNODE 13 /* struct: vnode structures */
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/* was: #define KERN_VNODE 13 ; disabled in 2003 and removed in 2023 */
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#define KERN_PROC 14 /* struct: process entries */
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#define KERN_FILE 15 /* struct: file entries */
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#define KERN_PROF 16 /* node: kernel profiling info */
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@ -199,36 +199,6 @@ _Static_assert(sizeof(struct vnode) <= 448, "vnode size crosses 448 bytes");
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/* XXX: These are temporary to avoid a source sweep at this time */
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#define v_object v_bufobj.bo_object
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/*
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* Userland version of struct vnode, for sysctl.
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*/
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struct xvnode {
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size_t xv_size; /* sizeof(struct xvnode) */
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void *xv_vnode; /* address of real vnode */
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u_long xv_flag; /* vnode vflags */
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int xv_usecount; /* reference count of users */
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int xv_writecount; /* reference count of writers */
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int xv_holdcnt; /* page & buffer references */
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u_long xv_id; /* capability identifier */
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void *xv_mount; /* address of parent mount */
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long xv_numoutput; /* num of writes in progress */
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enum vtype xv_type; /* vnode type */
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union {
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void *xvu_socket; /* unpcb, if VSOCK */
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void *xvu_fifo; /* fifo, if VFIFO */
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dev_t xvu_rdev; /* maj/min, if VBLK/VCHR */
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struct {
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dev_t xvu_dev; /* device, if VDIR/VREG/VLNK */
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ino_t xvu_ino; /* id, if VDIR/VREG/VLNK */
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} xv_uns;
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} xv_un;
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};
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#define xv_socket xv_un.xvu_socket
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#define xv_fifo xv_un.xvu_fifo
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#define xv_rdev xv_un.xvu_rdev
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#define xv_dev xv_un.xv_uns.xvu_dev
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#define xv_ino xv_un.xv_uns.xvu_ino
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/* We don't need to lock the knlist */
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#define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL || \
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KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note))
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