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06cb76bde3
call ASSERT_VOP_LOCKED(vp, __func__) without a diagnostic. Inspired by: the evil and rude OpenAFS cache manager code
3795 lines
91 KiB
C
3795 lines
91 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
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*/
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/*
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* External virtual filesystem routines
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/eventhandler.h>
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#include <sys/extattr.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#include <vm/uma.h>
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static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
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static void addalias(struct vnode *vp, dev_t nvp_rdev);
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static void insmntque(struct vnode *vp, struct mount *mp);
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static void vclean(struct vnode *vp, int flags, struct thread *td);
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static void vlruvp(struct vnode *vp);
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static int flushbuflist(struct buf *blist, int flags, struct vnode *vp,
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int slpflag, int slptimeo, int *errorp);
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static int vtryrecycle(struct vnode *vp);
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static void vx_lock(struct vnode *vp);
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static void vx_unlock(struct vnode *vp);
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static void vgonechrl(struct vnode *vp, struct thread *td);
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/*
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* Number of vnodes in existence. Increased whenever getnewvnode()
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* allocates a new vnode, never decreased.
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*/
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static unsigned long numvnodes;
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SYSCTL_LONG(_vfs, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, "");
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/*
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* Conversion tables for conversion from vnode types to inode formats
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* and back.
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*/
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enum vtype iftovt_tab[16] = {
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VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
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VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
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};
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int vttoif_tab[9] = {
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0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
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S_IFSOCK, S_IFIFO, S_IFMT,
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};
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/*
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* List of vnodes that are ready for recycling.
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*/
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static TAILQ_HEAD(freelst, vnode) vnode_free_list;
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/*
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* Minimum number of free vnodes. If there are fewer than this free vnodes,
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* getnewvnode() will return a newly allocated vnode.
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*/
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static u_long wantfreevnodes = 25;
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SYSCTL_LONG(_vfs, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, "");
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/* Number of vnodes in the free list. */
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static u_long freevnodes;
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SYSCTL_LONG(_vfs, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, "");
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/*
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* Various variables used for debugging the new implementation of
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* reassignbuf().
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* XXX these are probably of (very) limited utility now.
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*/
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static int reassignbufcalls;
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SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, "");
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static int nameileafonly;
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SYSCTL_INT(_vfs, OID_AUTO, nameileafonly, CTLFLAG_RW, &nameileafonly, 0, "");
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/*
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* Cache for the mount type id assigned to NFS. This is used for
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* special checks in nfs/nfs_nqlease.c and vm/vnode_pager.c.
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*/
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int nfs_mount_type = -1;
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/* To keep more than one thread at a time from running vfs_getnewfsid */
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static struct mtx mntid_mtx;
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/*
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* Lock for any access to the following:
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* vnode_free_list
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* numvnodes
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* freevnodes
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*/
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static struct mtx vnode_free_list_mtx;
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/*
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* For any iteration/modification of dev->si_hlist (linked through
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* v_specnext)
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*/
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static struct mtx spechash_mtx;
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/* Publicly exported FS */
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struct nfs_public nfs_pub;
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/* Zone for allocation of new vnodes - used exclusively by getnewvnode() */
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static uma_zone_t vnode_zone;
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static uma_zone_t vnodepoll_zone;
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/* Set to 1 to print out reclaim of active vnodes */
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int prtactive;
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/*
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* The workitem queue.
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*
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* It is useful to delay writes of file data and filesystem metadata
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* for tens of seconds so that quickly created and deleted files need
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* not waste disk bandwidth being created and removed. To realize this,
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* we append vnodes to a "workitem" queue. When running with a soft
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* updates implementation, most pending metadata dependencies should
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* not wait for more than a few seconds. Thus, mounted on block devices
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* are delayed only about a half the time that file data is delayed.
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* Similarly, directory updates are more critical, so are only delayed
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* about a third the time that file data is delayed. Thus, there are
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* SYNCER_MAXDELAY queues that are processed round-robin at a rate of
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* one each second (driven off the filesystem syncer process). The
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* syncer_delayno variable indicates the next queue that is to be processed.
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* Items that need to be processed soon are placed in this queue:
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*
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* syncer_workitem_pending[syncer_delayno]
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*
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* A delay of fifteen seconds is done by placing the request fifteen
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* entries later in the queue:
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*
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* syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask]
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*
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*/
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static int syncer_delayno;
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static long syncer_mask;
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LIST_HEAD(synclist, vnode);
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static struct synclist *syncer_workitem_pending;
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/*
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* The sync_mtx protects:
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* vp->v_synclist
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* syncer_delayno
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* syncer_workitem_pending
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* rushjob
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*/
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static struct mtx sync_mtx;
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#define SYNCER_MAXDELAY 32
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static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */
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static int syncdelay = 30; /* max time to delay syncing data */
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static int filedelay = 30; /* time to delay syncing files */
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SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, &filedelay, 0, "");
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static int dirdelay = 29; /* time to delay syncing directories */
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SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, &dirdelay, 0, "");
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static int metadelay = 28; /* time to delay syncing metadata */
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SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, &metadelay, 0, "");
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static int rushjob; /* number of slots to run ASAP */
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static int stat_rush_requests; /* number of times I/O speeded up */
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SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, &stat_rush_requests, 0, "");
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/*
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* Number of vnodes we want to exist at any one time. This is mostly used
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* to size hash tables in vnode-related code. It is normally not used in
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* getnewvnode(), as wantfreevnodes is normally nonzero.)
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*
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* XXX desiredvnodes is historical cruft and should not exist.
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*/
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int desiredvnodes;
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SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW,
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&desiredvnodes, 0, "Maximum number of vnodes");
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static int minvnodes;
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SYSCTL_INT(_kern, OID_AUTO, minvnodes, CTLFLAG_RW,
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&minvnodes, 0, "Minimum number of vnodes");
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static int vnlru_nowhere;
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SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW, &vnlru_nowhere, 0,
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"Number of times the vnlru process ran without success");
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/* Hook for calling soft updates */
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int (*softdep_process_worklist_hook)(struct mount *);
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/*
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* This only exists to supress warnings from unlocked specfs accesses. It is
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* no longer ok to have an unlocked VFS.
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*/
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#define IGNORE_LOCK(vp) ((vp)->v_type == VCHR || (vp)->v_type == VBAD)
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/* Print lock violations */
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int vfs_badlock_print = 1;
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/* Panic on violation */
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int vfs_badlock_panic = 1;
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/* Check for interlock across VOPs */
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int vfs_badlock_mutex = 1;
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static void
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vfs_badlock(const char *msg, const char *str, struct vnode *vp)
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{
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if (vfs_badlock_print)
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printf("%s: %p %s\n", str, vp, msg);
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if (vfs_badlock_panic)
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Debugger("Lock violation.\n");
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}
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void
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assert_vi_unlocked(struct vnode *vp, const char *str)
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{
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if (vfs_badlock_mutex && mtx_owned(VI_MTX(vp)))
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vfs_badlock("interlock is locked but should not be", str, vp);
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}
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void
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assert_vi_locked(struct vnode *vp, const char *str)
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{
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if (vfs_badlock_mutex && !mtx_owned(VI_MTX(vp)))
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vfs_badlock("interlock is not locked but should be", str, vp);
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}
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void
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assert_vop_locked(struct vnode *vp, const char *str)
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{
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if (vp && !IGNORE_LOCK(vp) && !VOP_ISLOCKED(vp, NULL))
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vfs_badlock("is not locked but should be", str, vp);
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}
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void
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assert_vop_unlocked(struct vnode *vp, const char *str)
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{
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if (vp && !IGNORE_LOCK(vp) &&
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VOP_ISLOCKED(vp, curthread) == LK_EXCLUSIVE)
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vfs_badlock("is locked but should not be", str, vp);
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}
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void
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assert_vop_elocked(struct vnode *vp, const char *str)
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{
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if (vp && !IGNORE_LOCK(vp) &&
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VOP_ISLOCKED(vp, curthread) != LK_EXCLUSIVE)
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vfs_badlock("is not exclusive locked but should be", str, vp);
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}
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void
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assert_vop_elocked_other(struct vnode *vp, const char *str)
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{
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if (vp && !IGNORE_LOCK(vp) &&
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VOP_ISLOCKED(vp, curthread) != LK_EXCLOTHER)
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vfs_badlock("is not exclusive locked by another thread",
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str, vp);
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}
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void
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assert_vop_slocked(struct vnode *vp, const char *str)
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{
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if (vp && !IGNORE_LOCK(vp) &&
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VOP_ISLOCKED(vp, curthread) != LK_SHARED)
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vfs_badlock("is not locked shared but should be", str, vp);
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}
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void
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vop_rename_pre(void *ap)
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{
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struct vop_rename_args *a = ap;
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if (a->a_tvp)
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ASSERT_VI_UNLOCKED(a->a_tvp, "VOP_RENAME");
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ASSERT_VI_UNLOCKED(a->a_tdvp, "VOP_RENAME");
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ASSERT_VI_UNLOCKED(a->a_fvp, "VOP_RENAME");
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ASSERT_VI_UNLOCKED(a->a_fdvp, "VOP_RENAME");
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/* Check the source (from) */
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if (a->a_tdvp != a->a_fdvp)
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ASSERT_VOP_UNLOCKED(a->a_fdvp, "vop_rename: fdvp locked.\n");
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if (a->a_tvp != a->a_fvp)
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ASSERT_VOP_UNLOCKED(a->a_fvp, "vop_rename: tvp locked.\n");
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/* Check the target */
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if (a->a_tvp)
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ASSERT_VOP_LOCKED(a->a_tvp, "vop_rename: tvp not locked.\n");
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ASSERT_VOP_LOCKED(a->a_tdvp, "vop_rename: tdvp not locked.\n");
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}
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void
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vop_strategy_pre(void *ap)
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{
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struct vop_strategy_args *a = ap;
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struct buf *bp;
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bp = a->a_bp;
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/*
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* Cluster ops lock their component buffers but not the IO container.
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*/
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if ((bp->b_flags & B_CLUSTER) != 0)
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return;
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if (BUF_REFCNT(bp) < 1) {
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if (vfs_badlock_print)
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printf("VOP_STRATEGY: bp is not locked but should be.\n");
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if (vfs_badlock_panic)
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Debugger("Lock violation.\n");
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}
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}
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void
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vop_lookup_pre(void *ap)
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{
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struct vop_lookup_args *a = ap;
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struct vnode *dvp;
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dvp = a->a_dvp;
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ASSERT_VI_UNLOCKED(dvp, "VOP_LOOKUP");
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ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP");
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}
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void
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vop_lookup_post(void *ap, int rc)
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{
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struct vop_lookup_args *a = ap;
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struct componentname *cnp;
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struct vnode *dvp;
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struct vnode *vp;
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int flags;
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dvp = a->a_dvp;
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cnp = a->a_cnp;
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vp = *(a->a_vpp);
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flags = cnp->cn_flags;
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ASSERT_VI_UNLOCKED(dvp, "VOP_LOOKUP");
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/*
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* If this is the last path component for this lookup and LOCPARENT
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* is set, OR if there is an error the directory has to be locked.
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*/
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if ((flags & LOCKPARENT) && (flags & ISLASTCN))
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ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP (LOCKPARENT)");
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else if (rc != 0)
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ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP (error)");
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else if (dvp != vp)
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ASSERT_VOP_UNLOCKED(dvp, "VOP_LOOKUP (dvp)");
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if (flags & PDIRUNLOCK)
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ASSERT_VOP_UNLOCKED(dvp, "VOP_LOOKUP (PDIRUNLOCK)");
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}
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void
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vop_unlock_pre(void *ap)
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{
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struct vop_unlock_args *a = ap;
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if (a->a_flags & LK_INTERLOCK)
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ASSERT_VI_LOCKED(a->a_vp, "VOP_UNLOCK");
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ASSERT_VOP_LOCKED(a->a_vp, "VOP_UNLOCK");
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}
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void
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vop_unlock_post(void *ap, int rc)
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{
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struct vop_unlock_args *a = ap;
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if (a->a_flags & LK_INTERLOCK)
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ASSERT_VI_UNLOCKED(a->a_vp, "VOP_UNLOCK");
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}
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void
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vop_lock_pre(void *ap)
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{
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struct vop_lock_args *a = ap;
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if ((a->a_flags & LK_INTERLOCK) == 0)
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ASSERT_VI_UNLOCKED(a->a_vp, "VOP_LOCK");
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else
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ASSERT_VI_LOCKED(a->a_vp, "VOP_LOCK");
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}
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void
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vop_lock_post(void *ap, int rc)
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{
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struct vop_lock_args *a;
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a = ap;
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ASSERT_VI_UNLOCKED(a->a_vp, "VOP_LOCK");
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if (rc == 0)
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ASSERT_VOP_LOCKED(a->a_vp, "VOP_LOCK");
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}
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void
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v_addpollinfo(struct vnode *vp)
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{
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vp->v_pollinfo = uma_zalloc(vnodepoll_zone, M_WAITOK);
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mtx_init(&vp->v_pollinfo->vpi_lock, "vnode pollinfo", NULL, MTX_DEF);
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}
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/*
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* Initialize the vnode management data structures.
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*/
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static void
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vntblinit(void *dummy __unused)
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{
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|
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/*
|
|
* Desiredvnodes is a function of the physical memory size and
|
|
* the kernel's heap size. Specifically, desiredvnodes scales
|
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* in proportion to the physical memory size until two fifths
|
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* of the kernel's heap size is consumed by vnodes and vm
|
|
* objects.
|
|
*/
|
|
desiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * vm_kmem_size /
|
|
(5 * (sizeof(struct vm_object) + sizeof(struct vnode))));
|
|
minvnodes = desiredvnodes / 4;
|
|
mtx_init(&mountlist_mtx, "mountlist", NULL, MTX_DEF);
|
|
mtx_init(&mntvnode_mtx, "mntvnode", NULL, MTX_DEF);
|
|
mtx_init(&mntid_mtx, "mntid", NULL, MTX_DEF);
|
|
mtx_init(&spechash_mtx, "spechash", NULL, MTX_DEF);
|
|
TAILQ_INIT(&vnode_free_list);
|
|
mtx_init(&vnode_free_list_mtx, "vnode_free_list", NULL, MTX_DEF);
|
|
vnode_zone = uma_zcreate("VNODE", sizeof (struct vnode), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
vnodepoll_zone = uma_zcreate("VNODEPOLL", sizeof (struct vpollinfo),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
/*
|
|
* Initialize the filesystem syncer.
|
|
*/
|
|
syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE,
|
|
&syncer_mask);
|
|
syncer_maxdelay = syncer_mask + 1;
|
|
mtx_init(&sync_mtx, "Syncer mtx", NULL, MTX_DEF);
|
|
}
|
|
SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vntblinit, NULL)
|
|
|
|
|
|
/*
|
|
* Mark a mount point as busy. Used to synchronize access and to delay
|
|
* unmounting. Interlock is not released on failure.
|
|
*/
|
|
int
|
|
vfs_busy(mp, flags, interlkp, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct mtx *interlkp;
|
|
struct thread *td;
|
|
{
|
|
int lkflags;
|
|
|
|
if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
|
|
if (flags & LK_NOWAIT)
|
|
return (ENOENT);
|
|
mp->mnt_kern_flag |= MNTK_MWAIT;
|
|
/*
|
|
* Since all busy locks are shared except the exclusive
|
|
* lock granted when unmounting, the only place that a
|
|
* wakeup needs to be done is at the release of the
|
|
* exclusive lock at the end of dounmount.
|
|
*/
|
|
msleep(mp, interlkp, PVFS, "vfs_busy", 0);
|
|
return (ENOENT);
|
|
}
|
|
lkflags = LK_SHARED | LK_NOPAUSE;
|
|
if (interlkp)
|
|
lkflags |= LK_INTERLOCK;
|
|
if (lockmgr(&mp->mnt_lock, lkflags, interlkp, td))
|
|
panic("vfs_busy: unexpected lock failure");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a busy filesystem.
|
|
*/
|
|
void
|
|
vfs_unbusy(mp, td)
|
|
struct mount *mp;
|
|
struct thread *td;
|
|
{
|
|
|
|
lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
|
|
}
|
|
|
|
/*
|
|
* Lookup a mount point by filesystem identifier.
|
|
*/
|
|
struct mount *
|
|
vfs_getvfs(fsid)
|
|
fsid_t *fsid;
|
|
{
|
|
register struct mount *mp;
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
|
|
if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
|
|
mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) {
|
|
mtx_unlock(&mountlist_mtx);
|
|
return (mp);
|
|
}
|
|
}
|
|
mtx_unlock(&mountlist_mtx);
|
|
return ((struct mount *) 0);
|
|
}
|
|
|
|
/*
|
|
* Get a new unique fsid. Try to make its val[0] unique, since this value
|
|
* will be used to create fake device numbers for stat(). Also try (but
|
|
* not so hard) make its val[0] unique mod 2^16, since some emulators only
|
|
* support 16-bit device numbers. We end up with unique val[0]'s for the
|
|
* first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls.
|
|
*
|
|
* Keep in mind that several mounts may be running in parallel. Starting
|
|
* the search one past where the previous search terminated is both a
|
|
* micro-optimization and a defense against returning the same fsid to
|
|
* different mounts.
|
|
*/
|
|
void
|
|
vfs_getnewfsid(mp)
|
|
struct mount *mp;
|
|
{
|
|
static u_int16_t mntid_base;
|
|
fsid_t tfsid;
|
|
int mtype;
|
|
|
|
mtx_lock(&mntid_mtx);
|
|
mtype = mp->mnt_vfc->vfc_typenum;
|
|
tfsid.val[1] = mtype;
|
|
mtype = (mtype & 0xFF) << 24;
|
|
for (;;) {
|
|
tfsid.val[0] = makeudev(255,
|
|
mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF));
|
|
mntid_base++;
|
|
if (vfs_getvfs(&tfsid) == NULL)
|
|
break;
|
|
}
|
|
mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
|
|
mp->mnt_stat.f_fsid.val[1] = tfsid.val[1];
|
|
mtx_unlock(&mntid_mtx);
|
|
}
|
|
|
|
/*
|
|
* Knob to control the precision of file timestamps:
|
|
*
|
|
* 0 = seconds only; nanoseconds zeroed.
|
|
* 1 = seconds and nanoseconds, accurate within 1/HZ.
|
|
* 2 = seconds and nanoseconds, truncated to microseconds.
|
|
* >=3 = seconds and nanoseconds, maximum precision.
|
|
*/
|
|
enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
|
|
|
|
static int timestamp_precision = TSP_SEC;
|
|
SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
|
|
×tamp_precision, 0, "");
|
|
|
|
/*
|
|
* Get a current timestamp.
|
|
*/
|
|
void
|
|
vfs_timestamp(tsp)
|
|
struct timespec *tsp;
|
|
{
|
|
struct timeval tv;
|
|
|
|
switch (timestamp_precision) {
|
|
case TSP_SEC:
|
|
tsp->tv_sec = time_second;
|
|
tsp->tv_nsec = 0;
|
|
break;
|
|
case TSP_HZ:
|
|
getnanotime(tsp);
|
|
break;
|
|
case TSP_USEC:
|
|
microtime(&tv);
|
|
TIMEVAL_TO_TIMESPEC(&tv, tsp);
|
|
break;
|
|
case TSP_NSEC:
|
|
default:
|
|
nanotime(tsp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set vnode attributes to VNOVAL
|
|
*/
|
|
void
|
|
vattr_null(vap)
|
|
register struct vattr *vap;
|
|
{
|
|
|
|
vap->va_type = VNON;
|
|
vap->va_size = VNOVAL;
|
|
vap->va_bytes = VNOVAL;
|
|
vap->va_mode = VNOVAL;
|
|
vap->va_nlink = VNOVAL;
|
|
vap->va_uid = VNOVAL;
|
|
vap->va_gid = VNOVAL;
|
|
vap->va_fsid = VNOVAL;
|
|
vap->va_fileid = VNOVAL;
|
|
vap->va_blocksize = VNOVAL;
|
|
vap->va_rdev = VNOVAL;
|
|
vap->va_atime.tv_sec = VNOVAL;
|
|
vap->va_atime.tv_nsec = VNOVAL;
|
|
vap->va_mtime.tv_sec = VNOVAL;
|
|
vap->va_mtime.tv_nsec = VNOVAL;
|
|
vap->va_ctime.tv_sec = VNOVAL;
|
|
vap->va_ctime.tv_nsec = VNOVAL;
|
|
vap->va_birthtime.tv_sec = VNOVAL;
|
|
vap->va_birthtime.tv_nsec = VNOVAL;
|
|
vap->va_flags = VNOVAL;
|
|
vap->va_gen = VNOVAL;
|
|
vap->va_vaflags = 0;
|
|
}
|
|
|
|
/*
|
|
* This routine is called when we have too many vnodes. It attempts
|
|
* to free <count> vnodes and will potentially free vnodes that still
|
|
* have VM backing store (VM backing store is typically the cause
|
|
* of a vnode blowout so we want to do this). Therefore, this operation
|
|
* is not considered cheap.
|
|
*
|
|
* A number of conditions may prevent a vnode from being reclaimed.
|
|
* the buffer cache may have references on the vnode, a directory
|
|
* vnode may still have references due to the namei cache representing
|
|
* underlying files, or the vnode may be in active use. It is not
|
|
* desireable to reuse such vnodes. These conditions may cause the
|
|
* number of vnodes to reach some minimum value regardless of what
|
|
* you set kern.maxvnodes to. Do not set kern.maxvnodes too low.
|
|
*/
|
|
static int
|
|
vlrureclaim(struct mount *mp)
|
|
{
|
|
struct vnode *vp;
|
|
int done;
|
|
int trigger;
|
|
int usevnodes;
|
|
int count;
|
|
|
|
/*
|
|
* Calculate the trigger point, don't allow user
|
|
* screwups to blow us up. This prevents us from
|
|
* recycling vnodes with lots of resident pages. We
|
|
* aren't trying to free memory, we are trying to
|
|
* free vnodes.
|
|
*/
|
|
usevnodes = desiredvnodes;
|
|
if (usevnodes <= 0)
|
|
usevnodes = 1;
|
|
trigger = cnt.v_page_count * 2 / usevnodes;
|
|
|
|
done = 0;
|
|
mtx_lock(&mntvnode_mtx);
|
|
count = mp->mnt_nvnodelistsize / 10 + 1;
|
|
while (count && (vp = TAILQ_FIRST(&mp->mnt_nvnodelist)) != NULL) {
|
|
TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
|
|
if (vp->v_type != VNON &&
|
|
vp->v_type != VBAD &&
|
|
VI_TRYLOCK(vp)) {
|
|
if (VMIGHTFREE(vp) && /* critical path opt */
|
|
(vp->v_object == NULL ||
|
|
vp->v_object->resident_page_count < trigger)) {
|
|
mtx_unlock(&mntvnode_mtx);
|
|
vgonel(vp, curthread);
|
|
done++;
|
|
mtx_lock(&mntvnode_mtx);
|
|
} else
|
|
VI_UNLOCK(vp);
|
|
}
|
|
--count;
|
|
}
|
|
mtx_unlock(&mntvnode_mtx);
|
|
return done;
|
|
}
|
|
|
|
/*
|
|
* Attempt to recycle vnodes in a context that is always safe to block.
|
|
* Calling vlrurecycle() from the bowels of filesystem code has some
|
|
* interesting deadlock problems.
|
|
*/
|
|
static struct proc *vnlruproc;
|
|
static int vnlruproc_sig;
|
|
|
|
static void
|
|
vnlru_proc(void)
|
|
{
|
|
struct mount *mp, *nmp;
|
|
int done;
|
|
struct proc *p = vnlruproc;
|
|
struct thread *td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
EVENTHANDLER_REGISTER(shutdown_pre_sync, kproc_shutdown, p,
|
|
SHUTDOWN_PRI_FIRST);
|
|
|
|
for (;;) {
|
|
kthread_suspend_check(p);
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
if (numvnodes - freevnodes <= desiredvnodes * 9 / 10) {
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
vnlruproc_sig = 0;
|
|
wakeup(&vnlruproc_sig);
|
|
tsleep(vnlruproc, PVFS, "vlruwt", hz);
|
|
continue;
|
|
}
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
done = 0;
|
|
mtx_lock(&mountlist_mtx);
|
|
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
|
|
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {
|
|
nmp = TAILQ_NEXT(mp, mnt_list);
|
|
continue;
|
|
}
|
|
done += vlrureclaim(mp);
|
|
mtx_lock(&mountlist_mtx);
|
|
nmp = TAILQ_NEXT(mp, mnt_list);
|
|
vfs_unbusy(mp, td);
|
|
}
|
|
mtx_unlock(&mountlist_mtx);
|
|
if (done == 0) {
|
|
#if 0
|
|
/* These messages are temporary debugging aids */
|
|
if (vnlru_nowhere < 5)
|
|
printf("vnlru process getting nowhere..\n");
|
|
else if (vnlru_nowhere == 5)
|
|
printf("vnlru process messages stopped.\n");
|
|
#endif
|
|
vnlru_nowhere++;
|
|
tsleep(vnlruproc, PPAUSE, "vlrup", hz * 3);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct kproc_desc vnlru_kp = {
|
|
"vnlru",
|
|
vnlru_proc,
|
|
&vnlruproc
|
|
};
|
|
SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &vnlru_kp)
|
|
|
|
|
|
/*
|
|
* Routines having to do with the management of the vnode table.
|
|
*/
|
|
|
|
/*
|
|
* Check to see if a free vnode can be recycled. If it can,
|
|
* recycle it and return it with the vnode interlock held.
|
|
*/
|
|
static int
|
|
vtryrecycle(struct vnode *vp)
|
|
{
|
|
struct thread *td = curthread;
|
|
vm_object_t object;
|
|
struct mount *vnmp;
|
|
int error;
|
|
|
|
/* Don't recycle if we can't get the interlock */
|
|
if (!VI_TRYLOCK(vp))
|
|
return (EWOULDBLOCK);
|
|
/*
|
|
* This vnode may found and locked via some other list, if so we
|
|
* can't recycle it yet.
|
|
*/
|
|
if (vn_lock(vp, LK_INTERLOCK | LK_EXCLUSIVE | LK_NOWAIT, td) != 0)
|
|
return (EWOULDBLOCK);
|
|
/*
|
|
* Don't recycle if its filesystem is being suspended.
|
|
*/
|
|
if (vn_start_write(vp, &vnmp, V_NOWAIT) != 0) {
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Don't recycle if we still have cached pages.
|
|
*/
|
|
if (VOP_GETVOBJECT(vp, &object) == 0) {
|
|
VM_OBJECT_LOCK(object);
|
|
if (object->resident_page_count ||
|
|
object->ref_count) {
|
|
VM_OBJECT_UNLOCK(object);
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
VM_OBJECT_UNLOCK(object);
|
|
}
|
|
if (LIST_FIRST(&vp->v_cache_src)) {
|
|
/*
|
|
* note: nameileafonly sysctl is temporary,
|
|
* for debugging only, and will eventually be
|
|
* removed.
|
|
*/
|
|
if (nameileafonly > 0) {
|
|
/*
|
|
* Do not reuse namei-cached directory
|
|
* vnodes that have cached
|
|
* subdirectories.
|
|
*/
|
|
if (cache_leaf_test(vp) < 0) {
|
|
error = EISDIR;
|
|
goto done;
|
|
}
|
|
} else if (nameileafonly < 0 ||
|
|
vmiodirenable == 0) {
|
|
/*
|
|
* Do not reuse namei-cached directory
|
|
* vnodes if nameileafonly is -1 or
|
|
* if VMIO backing for directories is
|
|
* turned off (otherwise we reuse them
|
|
* too quickly).
|
|
*/
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
}
|
|
/*
|
|
* If we got this far, we need to acquire the interlock and see if
|
|
* anyone picked up this vnode from another list. If not, we will
|
|
* mark it with XLOCK via vgonel() so that anyone who does find it
|
|
* will skip over it.
|
|
*/
|
|
VI_LOCK(vp);
|
|
if (VSHOULDBUSY(vp) && (vp->v_iflag & VI_XLOCK) == 0) {
|
|
VI_UNLOCK(vp);
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
vp->v_iflag &= ~VI_FREE;
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
vp->v_iflag |= VI_DOOMED;
|
|
if (vp->v_type != VBAD) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vgonel(vp, td);
|
|
VI_LOCK(vp);
|
|
} else
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vn_finished_write(vnmp);
|
|
return (0);
|
|
done:
|
|
VOP_UNLOCK(vp, 0, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return the next vnode from the free list.
|
|
*/
|
|
int
|
|
getnewvnode(tag, mp, vops, vpp)
|
|
const char *tag;
|
|
struct mount *mp;
|
|
vop_t **vops;
|
|
struct vnode **vpp;
|
|
{
|
|
struct vnode *vp = NULL;
|
|
struct vpollinfo *pollinfo = NULL;
|
|
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
|
|
/*
|
|
* Try to reuse vnodes if we hit the max. This situation only
|
|
* occurs in certain large-memory (2G+) situations. We cannot
|
|
* attempt to directly reclaim vnodes due to nasty recursion
|
|
* problems.
|
|
*/
|
|
while (numvnodes - freevnodes > desiredvnodes) {
|
|
if (vnlruproc_sig == 0) {
|
|
vnlruproc_sig = 1; /* avoid unnecessary wakeups */
|
|
wakeup(vnlruproc);
|
|
}
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
tsleep(&vnlruproc_sig, PVFS, "vlruwk", hz);
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
}
|
|
|
|
/*
|
|
* Attempt to reuse a vnode already on the free list, allocating
|
|
* a new vnode if we can't find one or if we have not reached a
|
|
* good minimum for good LRU performance.
|
|
*/
|
|
|
|
if (freevnodes >= wantfreevnodes && numvnodes >= minvnodes) {
|
|
int error;
|
|
int count;
|
|
|
|
for (count = 0; count < freevnodes; count++) {
|
|
vp = TAILQ_FIRST(&vnode_free_list);
|
|
|
|
KASSERT(vp->v_usecount == 0 &&
|
|
(vp->v_iflag & VI_DOINGINACT) == 0,
|
|
("getnewvnode: free vnode isn't"));
|
|
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
error = vtryrecycle(vp);
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
if (error == 0)
|
|
break;
|
|
vp = NULL;
|
|
}
|
|
}
|
|
if (vp) {
|
|
freevnodes--;
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
|
|
#ifdef INVARIANTS
|
|
{
|
|
if (vp->v_data)
|
|
panic("cleaned vnode isn't");
|
|
if (vp->v_numoutput)
|
|
panic("Clean vnode has pending I/O's");
|
|
if (vp->v_writecount != 0)
|
|
panic("Non-zero write count");
|
|
}
|
|
#endif
|
|
if ((pollinfo = vp->v_pollinfo) != NULL) {
|
|
/*
|
|
* To avoid lock order reversals, the call to
|
|
* uma_zfree() must be delayed until the vnode
|
|
* interlock is released.
|
|
*/
|
|
vp->v_pollinfo = NULL;
|
|
}
|
|
#ifdef MAC
|
|
mac_destroy_vnode(vp);
|
|
#endif
|
|
vp->v_iflag = 0;
|
|
vp->v_vflag = 0;
|
|
vp->v_lastw = 0;
|
|
vp->v_lasta = 0;
|
|
vp->v_cstart = 0;
|
|
vp->v_clen = 0;
|
|
vp->v_socket = 0;
|
|
lockdestroy(vp->v_vnlock);
|
|
lockinit(vp->v_vnlock, PVFS, tag, VLKTIMEOUT, LK_NOPAUSE);
|
|
KASSERT(vp->v_cleanbufcnt == 0, ("cleanbufcnt not 0"));
|
|
KASSERT(vp->v_cleanblkroot == NULL, ("cleanblkroot not NULL"));
|
|
KASSERT(vp->v_dirtybufcnt == 0, ("dirtybufcnt not 0"));
|
|
KASSERT(vp->v_dirtyblkroot == NULL, ("dirtyblkroot not NULL"));
|
|
} else {
|
|
numvnodes++;
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
|
|
vp = (struct vnode *) uma_zalloc(vnode_zone, M_WAITOK|M_ZERO);
|
|
mtx_init(&vp->v_interlock, "vnode interlock", NULL, MTX_DEF);
|
|
VI_LOCK(vp);
|
|
vp->v_dd = vp;
|
|
vp->v_vnlock = &vp->v_lock;
|
|
lockinit(vp->v_vnlock, PVFS, tag, VLKTIMEOUT, LK_NOPAUSE);
|
|
cache_purge(vp); /* Sets up v_id. */
|
|
LIST_INIT(&vp->v_cache_src);
|
|
TAILQ_INIT(&vp->v_cache_dst);
|
|
}
|
|
|
|
TAILQ_INIT(&vp->v_cleanblkhd);
|
|
TAILQ_INIT(&vp->v_dirtyblkhd);
|
|
vp->v_type = VNON;
|
|
vp->v_tag = tag;
|
|
vp->v_op = vops;
|
|
*vpp = vp;
|
|
vp->v_usecount = 1;
|
|
vp->v_data = 0;
|
|
vp->v_cachedid = -1;
|
|
VI_UNLOCK(vp);
|
|
if (pollinfo != NULL) {
|
|
mtx_destroy(&pollinfo->vpi_lock);
|
|
uma_zfree(vnodepoll_zone, pollinfo);
|
|
}
|
|
#ifdef MAC
|
|
mac_init_vnode(vp);
|
|
if (mp != NULL && (mp->mnt_flag & MNT_MULTILABEL) == 0)
|
|
mac_associate_vnode_singlelabel(mp, vp);
|
|
#endif
|
|
insmntque(vp, mp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Move a vnode from one mount queue to another.
|
|
*/
|
|
static void
|
|
insmntque(vp, mp)
|
|
register struct vnode *vp;
|
|
register struct mount *mp;
|
|
{
|
|
|
|
mtx_lock(&mntvnode_mtx);
|
|
/*
|
|
* Delete from old mount point vnode list, if on one.
|
|
*/
|
|
if (vp->v_mount != NULL) {
|
|
KASSERT(vp->v_mount->mnt_nvnodelistsize > 0,
|
|
("bad mount point vnode list size"));
|
|
TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
vp->v_mount->mnt_nvnodelistsize--;
|
|
}
|
|
/*
|
|
* Insert into list of vnodes for the new mount point, if available.
|
|
*/
|
|
if ((vp->v_mount = mp) != NULL) {
|
|
TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
mp->mnt_nvnodelistsize++;
|
|
}
|
|
mtx_unlock(&mntvnode_mtx);
|
|
}
|
|
|
|
/*
|
|
* Update outstanding I/O count and do wakeup if requested.
|
|
*/
|
|
void
|
|
vwakeup(bp)
|
|
register struct buf *bp;
|
|
{
|
|
register struct vnode *vp;
|
|
|
|
bp->b_flags &= ~B_WRITEINPROG;
|
|
if ((vp = bp->b_vp)) {
|
|
VI_LOCK(vp);
|
|
vp->v_numoutput--;
|
|
if (vp->v_numoutput < 0)
|
|
panic("vwakeup: neg numoutput");
|
|
if ((vp->v_numoutput == 0) && (vp->v_iflag & VI_BWAIT)) {
|
|
vp->v_iflag &= ~VI_BWAIT;
|
|
wakeup(&vp->v_numoutput);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Flush out and invalidate all buffers associated with a vnode.
|
|
* Called with the underlying object locked.
|
|
*/
|
|
int
|
|
vinvalbuf(vp, flags, cred, td, slpflag, slptimeo)
|
|
struct vnode *vp;
|
|
int flags;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
int slpflag, slptimeo;
|
|
{
|
|
struct buf *blist;
|
|
int error;
|
|
vm_object_t object;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
ASSERT_VOP_LOCKED(vp, "vinvalbuf");
|
|
|
|
VI_LOCK(vp);
|
|
if (flags & V_SAVE) {
|
|
while (vp->v_numoutput) {
|
|
vp->v_iflag |= VI_BWAIT;
|
|
error = msleep(&vp->v_numoutput, VI_MTX(vp),
|
|
slpflag | (PRIBIO + 1), "vinvlbuf", slptimeo);
|
|
if (error) {
|
|
VI_UNLOCK(vp);
|
|
return (error);
|
|
}
|
|
}
|
|
if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
|
|
VI_UNLOCK(vp);
|
|
if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, td)) != 0)
|
|
return (error);
|
|
/*
|
|
* XXX We could save a lock/unlock if this was only
|
|
* enabled under INVARIANTS
|
|
*/
|
|
VI_LOCK(vp);
|
|
if (vp->v_numoutput > 0 ||
|
|
!TAILQ_EMPTY(&vp->v_dirtyblkhd))
|
|
panic("vinvalbuf: dirty bufs");
|
|
}
|
|
}
|
|
/*
|
|
* If you alter this loop please notice that interlock is dropped and
|
|
* reacquired in flushbuflist. Special care is needed to ensure that
|
|
* no race conditions occur from this.
|
|
*/
|
|
for (error = 0;;) {
|
|
if ((blist = TAILQ_FIRST(&vp->v_cleanblkhd)) != 0 &&
|
|
flushbuflist(blist, flags, vp, slpflag, slptimeo, &error)) {
|
|
if (error)
|
|
break;
|
|
continue;
|
|
}
|
|
if ((blist = TAILQ_FIRST(&vp->v_dirtyblkhd)) != 0 &&
|
|
flushbuflist(blist, flags, vp, slpflag, slptimeo, &error)) {
|
|
if (error)
|
|
break;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (error) {
|
|
VI_UNLOCK(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Wait for I/O to complete. XXX needs cleaning up. The vnode can
|
|
* have write I/O in-progress but if there is a VM object then the
|
|
* VM object can also have read-I/O in-progress.
|
|
*/
|
|
do {
|
|
while (vp->v_numoutput > 0) {
|
|
vp->v_iflag |= VI_BWAIT;
|
|
msleep(&vp->v_numoutput, VI_MTX(vp), PVM, "vnvlbv", 0);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
if (VOP_GETVOBJECT(vp, &object) == 0) {
|
|
VM_OBJECT_LOCK(object);
|
|
vm_object_pip_wait(object, "vnvlbx");
|
|
VM_OBJECT_UNLOCK(object);
|
|
}
|
|
VI_LOCK(vp);
|
|
} while (vp->v_numoutput > 0);
|
|
VI_UNLOCK(vp);
|
|
|
|
/*
|
|
* Destroy the copy in the VM cache, too.
|
|
*/
|
|
if (VOP_GETVOBJECT(vp, &object) == 0) {
|
|
VM_OBJECT_LOCK(object);
|
|
vm_object_page_remove(object, 0, 0,
|
|
(flags & V_SAVE) ? TRUE : FALSE);
|
|
VM_OBJECT_UNLOCK(object);
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
VI_LOCK(vp);
|
|
if ((flags & (V_ALT | V_NORMAL)) == 0 &&
|
|
(!TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
|
|
!TAILQ_EMPTY(&vp->v_cleanblkhd)))
|
|
panic("vinvalbuf: flush failed");
|
|
VI_UNLOCK(vp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Flush out buffers on the specified list.
|
|
*
|
|
*/
|
|
static int
|
|
flushbuflist(blist, flags, vp, slpflag, slptimeo, errorp)
|
|
struct buf *blist;
|
|
int flags;
|
|
struct vnode *vp;
|
|
int slpflag, slptimeo;
|
|
int *errorp;
|
|
{
|
|
struct buf *bp, *nbp;
|
|
int found, error;
|
|
|
|
ASSERT_VI_LOCKED(vp, "flushbuflist");
|
|
|
|
for (found = 0, bp = blist; bp; bp = nbp) {
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
if (((flags & V_NORMAL) && (bp->b_xflags & BX_ALTDATA)) ||
|
|
((flags & V_ALT) && (bp->b_xflags & BX_ALTDATA) == 0)) {
|
|
continue;
|
|
}
|
|
found += 1;
|
|
error = BUF_TIMELOCK(bp,
|
|
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, VI_MTX(vp),
|
|
"flushbuf", slpflag, slptimeo);
|
|
if (error) {
|
|
if (error != ENOLCK)
|
|
*errorp = error;
|
|
goto done;
|
|
}
|
|
/*
|
|
* XXX Since there are no node locks for NFS, I
|
|
* believe there is a slight chance that a delayed
|
|
* write will occur while sleeping just above, so
|
|
* check for it. Note that vfs_bio_awrite expects
|
|
* buffers to reside on a queue, while BUF_WRITE and
|
|
* brelse do not.
|
|
*/
|
|
if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
|
|
(flags & V_SAVE)) {
|
|
|
|
if (bp->b_vp == vp) {
|
|
if (bp->b_flags & B_CLUSTEROK) {
|
|
vfs_bio_awrite(bp);
|
|
} else {
|
|
bremfree(bp);
|
|
bp->b_flags |= B_ASYNC;
|
|
BUF_WRITE(bp);
|
|
}
|
|
} else {
|
|
bremfree(bp);
|
|
(void) BUF_WRITE(bp);
|
|
}
|
|
goto done;
|
|
}
|
|
bremfree(bp);
|
|
bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
|
|
bp->b_flags &= ~B_ASYNC;
|
|
brelse(bp);
|
|
VI_LOCK(vp);
|
|
}
|
|
return (found);
|
|
done:
|
|
VI_LOCK(vp);
|
|
return (found);
|
|
}
|
|
|
|
/*
|
|
* Truncate a file's buffer and pages to a specified length. This
|
|
* is in lieu of the old vinvalbuf mechanism, which performed unneeded
|
|
* sync activity.
|
|
*/
|
|
int
|
|
vtruncbuf(vp, cred, td, length, blksize)
|
|
register struct vnode *vp;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
off_t length;
|
|
int blksize;
|
|
{
|
|
register struct buf *bp;
|
|
struct buf *nbp;
|
|
int anyfreed;
|
|
int trunclbn;
|
|
|
|
/*
|
|
* Round up to the *next* lbn.
|
|
*/
|
|
trunclbn = (length + blksize - 1) / blksize;
|
|
|
|
ASSERT_VOP_LOCKED(vp, "vtruncbuf");
|
|
restart:
|
|
VI_LOCK(vp);
|
|
anyfreed = 1;
|
|
for (;anyfreed;) {
|
|
anyfreed = 0;
|
|
for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) {
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
if (bp->b_lblkno >= trunclbn) {
|
|
if (BUF_LOCK(bp,
|
|
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
|
|
VI_MTX(vp)) == ENOLCK)
|
|
goto restart;
|
|
|
|
bremfree(bp);
|
|
bp->b_flags |= (B_INVAL | B_RELBUF);
|
|
bp->b_flags &= ~B_ASYNC;
|
|
brelse(bp);
|
|
anyfreed = 1;
|
|
|
|
if (nbp &&
|
|
(((nbp->b_xflags & BX_VNCLEAN) == 0) ||
|
|
(nbp->b_vp != vp) ||
|
|
(nbp->b_flags & B_DELWRI))) {
|
|
goto restart;
|
|
}
|
|
VI_LOCK(vp);
|
|
}
|
|
}
|
|
|
|
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
if (bp->b_lblkno >= trunclbn) {
|
|
if (BUF_LOCK(bp,
|
|
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
|
|
VI_MTX(vp)) == ENOLCK)
|
|
goto restart;
|
|
bremfree(bp);
|
|
bp->b_flags |= (B_INVAL | B_RELBUF);
|
|
bp->b_flags &= ~B_ASYNC;
|
|
brelse(bp);
|
|
anyfreed = 1;
|
|
if (nbp &&
|
|
(((nbp->b_xflags & BX_VNDIRTY) == 0) ||
|
|
(nbp->b_vp != vp) ||
|
|
(nbp->b_flags & B_DELWRI) == 0)) {
|
|
goto restart;
|
|
}
|
|
VI_LOCK(vp);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (length > 0) {
|
|
restartsync:
|
|
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
if (bp->b_lblkno > 0)
|
|
continue;
|
|
/*
|
|
* Since we hold the vnode lock this should only
|
|
* fail if we're racing with the buf daemon.
|
|
*/
|
|
if (BUF_LOCK(bp,
|
|
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
|
|
VI_MTX(vp)) == ENOLCK) {
|
|
goto restart;
|
|
}
|
|
KASSERT((bp->b_flags & B_DELWRI),
|
|
("buf(%p) on dirty queue without DELWRI.", bp));
|
|
|
|
bremfree(bp);
|
|
bawrite(bp);
|
|
VI_LOCK(vp);
|
|
goto restartsync;
|
|
}
|
|
}
|
|
|
|
while (vp->v_numoutput > 0) {
|
|
vp->v_iflag |= VI_BWAIT;
|
|
msleep(&vp->v_numoutput, VI_MTX(vp), PVM, "vbtrunc", 0);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
vnode_pager_setsize(vp, length);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* buf_splay() - splay tree core for the clean/dirty list of buffers in
|
|
* a vnode.
|
|
*
|
|
* NOTE: We have to deal with the special case of a background bitmap
|
|
* buffer, a situation where two buffers will have the same logical
|
|
* block offset. We want (1) only the foreground buffer to be accessed
|
|
* in a lookup and (2) must differentiate between the foreground and
|
|
* background buffer in the splay tree algorithm because the splay
|
|
* tree cannot normally handle multiple entities with the same 'index'.
|
|
* We accomplish this by adding differentiating flags to the splay tree's
|
|
* numerical domain.
|
|
*/
|
|
static
|
|
struct buf *
|
|
buf_splay(daddr_t lblkno, b_xflags_t xflags, struct buf *root)
|
|
{
|
|
struct buf dummy;
|
|
struct buf *lefttreemax, *righttreemin, *y;
|
|
|
|
if (root == NULL)
|
|
return (NULL);
|
|
lefttreemax = righttreemin = &dummy;
|
|
for (;;) {
|
|
if (lblkno < root->b_lblkno ||
|
|
(lblkno == root->b_lblkno &&
|
|
(xflags & BX_BKGRDMARKER) < (root->b_xflags & BX_BKGRDMARKER))) {
|
|
if ((y = root->b_left) == NULL)
|
|
break;
|
|
if (lblkno < y->b_lblkno) {
|
|
/* Rotate right. */
|
|
root->b_left = y->b_right;
|
|
y->b_right = root;
|
|
root = y;
|
|
if ((y = root->b_left) == NULL)
|
|
break;
|
|
}
|
|
/* Link into the new root's right tree. */
|
|
righttreemin->b_left = root;
|
|
righttreemin = root;
|
|
} else if (lblkno > root->b_lblkno ||
|
|
(lblkno == root->b_lblkno &&
|
|
(xflags & BX_BKGRDMARKER) > (root->b_xflags & BX_BKGRDMARKER))) {
|
|
if ((y = root->b_right) == NULL)
|
|
break;
|
|
if (lblkno > y->b_lblkno) {
|
|
/* Rotate left. */
|
|
root->b_right = y->b_left;
|
|
y->b_left = root;
|
|
root = y;
|
|
if ((y = root->b_right) == NULL)
|
|
break;
|
|
}
|
|
/* Link into the new root's left tree. */
|
|
lefttreemax->b_right = root;
|
|
lefttreemax = root;
|
|
} else {
|
|
break;
|
|
}
|
|
root = y;
|
|
}
|
|
/* Assemble the new root. */
|
|
lefttreemax->b_right = root->b_left;
|
|
righttreemin->b_left = root->b_right;
|
|
root->b_left = dummy.b_right;
|
|
root->b_right = dummy.b_left;
|
|
return (root);
|
|
}
|
|
|
|
static
|
|
void
|
|
buf_vlist_remove(struct buf *bp)
|
|
{
|
|
struct vnode *vp = bp->b_vp;
|
|
struct buf *root;
|
|
|
|
ASSERT_VI_LOCKED(vp, "buf_vlist_remove");
|
|
if (bp->b_xflags & BX_VNDIRTY) {
|
|
if (bp != vp->v_dirtyblkroot) {
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, vp->v_dirtyblkroot);
|
|
KASSERT(root == bp, ("splay lookup failed during dirty remove"));
|
|
}
|
|
if (bp->b_left == NULL) {
|
|
root = bp->b_right;
|
|
} else {
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, bp->b_left);
|
|
root->b_right = bp->b_right;
|
|
}
|
|
vp->v_dirtyblkroot = root;
|
|
TAILQ_REMOVE(&vp->v_dirtyblkhd, bp, b_vnbufs);
|
|
vp->v_dirtybufcnt--;
|
|
} else {
|
|
/* KASSERT(bp->b_xflags & BX_VNCLEAN, ("bp wasn't clean")); */
|
|
if (bp != vp->v_cleanblkroot) {
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, vp->v_cleanblkroot);
|
|
KASSERT(root == bp, ("splay lookup failed during clean remove"));
|
|
}
|
|
if (bp->b_left == NULL) {
|
|
root = bp->b_right;
|
|
} else {
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, bp->b_left);
|
|
root->b_right = bp->b_right;
|
|
}
|
|
vp->v_cleanblkroot = root;
|
|
TAILQ_REMOVE(&vp->v_cleanblkhd, bp, b_vnbufs);
|
|
vp->v_cleanbufcnt--;
|
|
}
|
|
bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN);
|
|
}
|
|
|
|
/*
|
|
* Add the buffer to the sorted clean or dirty block list using a
|
|
* splay tree algorithm.
|
|
*
|
|
* NOTE: xflags is passed as a constant, optimizing this inline function!
|
|
*/
|
|
static
|
|
void
|
|
buf_vlist_add(struct buf *bp, struct vnode *vp, b_xflags_t xflags)
|
|
{
|
|
struct buf *root;
|
|
|
|
ASSERT_VI_LOCKED(vp, "buf_vlist_add");
|
|
bp->b_xflags |= xflags;
|
|
if (xflags & BX_VNDIRTY) {
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, vp->v_dirtyblkroot);
|
|
if (root == NULL) {
|
|
bp->b_left = NULL;
|
|
bp->b_right = NULL;
|
|
TAILQ_INSERT_TAIL(&vp->v_dirtyblkhd, bp, b_vnbufs);
|
|
} else if (bp->b_lblkno < root->b_lblkno ||
|
|
(bp->b_lblkno == root->b_lblkno &&
|
|
(bp->b_xflags & BX_BKGRDMARKER) < (root->b_xflags & BX_BKGRDMARKER))) {
|
|
bp->b_left = root->b_left;
|
|
bp->b_right = root;
|
|
root->b_left = NULL;
|
|
TAILQ_INSERT_BEFORE(root, bp, b_vnbufs);
|
|
} else {
|
|
bp->b_right = root->b_right;
|
|
bp->b_left = root;
|
|
root->b_right = NULL;
|
|
TAILQ_INSERT_AFTER(&vp->v_dirtyblkhd,
|
|
root, bp, b_vnbufs);
|
|
}
|
|
vp->v_dirtybufcnt++;
|
|
vp->v_dirtyblkroot = bp;
|
|
} else {
|
|
/* KASSERT(xflags & BX_VNCLEAN, ("xflags not clean")); */
|
|
root = buf_splay(bp->b_lblkno, bp->b_xflags, vp->v_cleanblkroot);
|
|
if (root == NULL) {
|
|
bp->b_left = NULL;
|
|
bp->b_right = NULL;
|
|
TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs);
|
|
} else if (bp->b_lblkno < root->b_lblkno ||
|
|
(bp->b_lblkno == root->b_lblkno &&
|
|
(bp->b_xflags & BX_BKGRDMARKER) < (root->b_xflags & BX_BKGRDMARKER))) {
|
|
bp->b_left = root->b_left;
|
|
bp->b_right = root;
|
|
root->b_left = NULL;
|
|
TAILQ_INSERT_BEFORE(root, bp, b_vnbufs);
|
|
} else {
|
|
bp->b_right = root->b_right;
|
|
bp->b_left = root;
|
|
root->b_right = NULL;
|
|
TAILQ_INSERT_AFTER(&vp->v_cleanblkhd,
|
|
root, bp, b_vnbufs);
|
|
}
|
|
vp->v_cleanbufcnt++;
|
|
vp->v_cleanblkroot = bp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lookup a buffer using the splay tree. Note that we specifically avoid
|
|
* shadow buffers used in background bitmap writes.
|
|
*
|
|
* This code isn't quite efficient as it could be because we are maintaining
|
|
* two sorted lists and do not know which list the block resides in.
|
|
*
|
|
* During a "make buildworld" the desired buffer is found at one of
|
|
* the roots more than 60% of the time. Thus, checking both roots
|
|
* before performing either splay eliminates unnecessary splays on the
|
|
* first tree splayed.
|
|
*/
|
|
struct buf *
|
|
gbincore(struct vnode *vp, daddr_t lblkno)
|
|
{
|
|
struct buf *bp;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
ASSERT_VI_LOCKED(vp, "gbincore");
|
|
if ((bp = vp->v_cleanblkroot) != NULL &&
|
|
bp->b_lblkno == lblkno && !(bp->b_xflags & BX_BKGRDMARKER))
|
|
return (bp);
|
|
if ((bp = vp->v_dirtyblkroot) != NULL &&
|
|
bp->b_lblkno == lblkno && !(bp->b_xflags & BX_BKGRDMARKER))
|
|
return (bp);
|
|
if ((bp = vp->v_cleanblkroot) != NULL) {
|
|
vp->v_cleanblkroot = bp = buf_splay(lblkno, 0, bp);
|
|
if (bp->b_lblkno == lblkno && !(bp->b_xflags & BX_BKGRDMARKER))
|
|
return (bp);
|
|
}
|
|
if ((bp = vp->v_dirtyblkroot) != NULL) {
|
|
vp->v_dirtyblkroot = bp = buf_splay(lblkno, 0, bp);
|
|
if (bp->b_lblkno == lblkno && !(bp->b_xflags & BX_BKGRDMARKER))
|
|
return (bp);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Associate a buffer with a vnode.
|
|
*/
|
|
void
|
|
bgetvp(vp, bp)
|
|
register struct vnode *vp;
|
|
register struct buf *bp;
|
|
{
|
|
KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
|
|
|
|
KASSERT((bp->b_xflags & (BX_VNDIRTY|BX_VNCLEAN)) == 0,
|
|
("bgetvp: bp already attached! %p", bp));
|
|
|
|
ASSERT_VI_LOCKED(vp, "bgetvp");
|
|
vholdl(vp);
|
|
bp->b_vp = vp;
|
|
bp->b_dev = vn_todev(vp);
|
|
/*
|
|
* Insert onto list for new vnode.
|
|
*/
|
|
buf_vlist_add(bp, vp, BX_VNCLEAN);
|
|
}
|
|
|
|
/*
|
|
* Disassociate a buffer from a vnode.
|
|
*/
|
|
void
|
|
brelvp(bp)
|
|
register struct buf *bp;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
|
|
|
|
/*
|
|
* Delete from old vnode list, if on one.
|
|
*/
|
|
vp = bp->b_vp;
|
|
VI_LOCK(vp);
|
|
if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN))
|
|
buf_vlist_remove(bp);
|
|
if ((vp->v_iflag & VI_ONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
|
|
vp->v_iflag &= ~VI_ONWORKLST;
|
|
mtx_lock(&sync_mtx);
|
|
LIST_REMOVE(vp, v_synclist);
|
|
mtx_unlock(&sync_mtx);
|
|
}
|
|
vdropl(vp);
|
|
bp->b_vp = (struct vnode *) 0;
|
|
if (bp->b_object)
|
|
bp->b_object = NULL;
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
/*
|
|
* Add an item to the syncer work queue.
|
|
*/
|
|
static void
|
|
vn_syncer_add_to_worklist(struct vnode *vp, int delay)
|
|
{
|
|
int slot;
|
|
|
|
ASSERT_VI_LOCKED(vp, "vn_syncer_add_to_worklist");
|
|
|
|
mtx_lock(&sync_mtx);
|
|
if (vp->v_iflag & VI_ONWORKLST)
|
|
LIST_REMOVE(vp, v_synclist);
|
|
else
|
|
vp->v_iflag |= VI_ONWORKLST;
|
|
|
|
if (delay > syncer_maxdelay - 2)
|
|
delay = syncer_maxdelay - 2;
|
|
slot = (syncer_delayno + delay) & syncer_mask;
|
|
|
|
LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist);
|
|
mtx_unlock(&sync_mtx);
|
|
}
|
|
|
|
struct proc *updateproc;
|
|
static void sched_sync(void);
|
|
static struct kproc_desc up_kp = {
|
|
"syncer",
|
|
sched_sync,
|
|
&updateproc
|
|
};
|
|
SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp)
|
|
|
|
/*
|
|
* System filesystem synchronizer daemon.
|
|
*/
|
|
static void
|
|
sched_sync(void)
|
|
{
|
|
struct synclist *next;
|
|
struct synclist *slp;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
long starttime;
|
|
struct thread *td = FIRST_THREAD_IN_PROC(updateproc); /* XXXKSE */
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
EVENTHANDLER_REGISTER(shutdown_pre_sync, kproc_shutdown, td->td_proc,
|
|
SHUTDOWN_PRI_LAST);
|
|
|
|
for (;;) {
|
|
kthread_suspend_check(td->td_proc);
|
|
|
|
starttime = time_second;
|
|
|
|
/*
|
|
* Push files whose dirty time has expired. Be careful
|
|
* of interrupt race on slp queue.
|
|
*/
|
|
mtx_lock(&sync_mtx);
|
|
slp = &syncer_workitem_pending[syncer_delayno];
|
|
syncer_delayno += 1;
|
|
if (syncer_delayno == syncer_maxdelay)
|
|
syncer_delayno = 0;
|
|
next = &syncer_workitem_pending[syncer_delayno];
|
|
|
|
while ((vp = LIST_FIRST(slp)) != NULL) {
|
|
if (VOP_ISLOCKED(vp, NULL) != 0 ||
|
|
vn_start_write(vp, &mp, V_NOWAIT) != 0) {
|
|
LIST_REMOVE(vp, v_synclist);
|
|
LIST_INSERT_HEAD(next, vp, v_synclist);
|
|
continue;
|
|
}
|
|
if (VI_TRYLOCK(vp) == 0) {
|
|
LIST_REMOVE(vp, v_synclist);
|
|
LIST_INSERT_HEAD(next, vp, v_synclist);
|
|
vn_finished_write(mp);
|
|
continue;
|
|
}
|
|
/*
|
|
* We use vhold in case the vnode does not
|
|
* successfully sync. vhold prevents the vnode from
|
|
* going away when we unlock the sync_mtx so that
|
|
* we can acquire the vnode interlock.
|
|
*/
|
|
vholdl(vp);
|
|
mtx_unlock(&sync_mtx);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK, td);
|
|
(void) VOP_FSYNC(vp, td->td_ucred, MNT_LAZY, td);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vn_finished_write(mp);
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_ONWORKLST) != 0) {
|
|
/*
|
|
* Put us back on the worklist. The worklist
|
|
* routine will remove us from our current
|
|
* position and then add us back in at a later
|
|
* position.
|
|
*/
|
|
vn_syncer_add_to_worklist(vp, syncdelay);
|
|
}
|
|
vdropl(vp);
|
|
VI_UNLOCK(vp);
|
|
mtx_lock(&sync_mtx);
|
|
}
|
|
mtx_unlock(&sync_mtx);
|
|
|
|
/*
|
|
* Do soft update processing.
|
|
*/
|
|
if (softdep_process_worklist_hook != NULL)
|
|
(*softdep_process_worklist_hook)(NULL);
|
|
|
|
/*
|
|
* The variable rushjob allows the kernel to speed up the
|
|
* processing of the filesystem syncer process. A rushjob
|
|
* value of N tells the filesystem syncer to process the next
|
|
* N seconds worth of work on its queue ASAP. Currently rushjob
|
|
* is used by the soft update code to speed up the filesystem
|
|
* syncer process when the incore state is getting so far
|
|
* ahead of the disk that the kernel memory pool is being
|
|
* threatened with exhaustion.
|
|
*/
|
|
mtx_lock(&sync_mtx);
|
|
if (rushjob > 0) {
|
|
rushjob -= 1;
|
|
mtx_unlock(&sync_mtx);
|
|
continue;
|
|
}
|
|
mtx_unlock(&sync_mtx);
|
|
/*
|
|
* If it has taken us less than a second to process the
|
|
* current work, then wait. Otherwise start right over
|
|
* again. We can still lose time if any single round
|
|
* takes more than two seconds, but it does not really
|
|
* matter as we are just trying to generally pace the
|
|
* filesystem activity.
|
|
*/
|
|
if (time_second == starttime)
|
|
tsleep(&lbolt, PPAUSE, "syncer", 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request the syncer daemon to speed up its work.
|
|
* We never push it to speed up more than half of its
|
|
* normal turn time, otherwise it could take over the cpu.
|
|
* XXXKSE only one update?
|
|
*/
|
|
int
|
|
speedup_syncer()
|
|
{
|
|
struct thread *td;
|
|
int ret = 0;
|
|
|
|
td = FIRST_THREAD_IN_PROC(updateproc);
|
|
mtx_lock_spin(&sched_lock);
|
|
if (td->td_wchan == &lbolt) {
|
|
unsleep(td);
|
|
TD_CLR_SLEEPING(td);
|
|
setrunnable(td);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
mtx_lock(&sync_mtx);
|
|
if (rushjob < syncdelay / 2) {
|
|
rushjob += 1;
|
|
stat_rush_requests += 1;
|
|
ret = 1;
|
|
}
|
|
mtx_unlock(&sync_mtx);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Associate a p-buffer with a vnode.
|
|
*
|
|
* Also sets B_PAGING flag to indicate that vnode is not fully associated
|
|
* with the buffer. i.e. the bp has not been linked into the vnode or
|
|
* ref-counted.
|
|
*/
|
|
void
|
|
pbgetvp(vp, bp)
|
|
register struct vnode *vp;
|
|
register struct buf *bp;
|
|
{
|
|
|
|
KASSERT(bp->b_vp == NULL, ("pbgetvp: not free"));
|
|
|
|
bp->b_vp = vp;
|
|
bp->b_object = vp->v_object;
|
|
bp->b_flags |= B_PAGING;
|
|
bp->b_dev = vn_todev(vp);
|
|
}
|
|
|
|
/*
|
|
* Disassociate a p-buffer from a vnode.
|
|
*/
|
|
void
|
|
pbrelvp(bp)
|
|
register struct buf *bp;
|
|
{
|
|
|
|
KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL"));
|
|
|
|
/* XXX REMOVE ME */
|
|
VI_LOCK(bp->b_vp);
|
|
if (TAILQ_NEXT(bp, b_vnbufs) != NULL) {
|
|
panic(
|
|
"relpbuf(): b_vp was probably reassignbuf()d %p %x",
|
|
bp,
|
|
(int)bp->b_flags
|
|
);
|
|
}
|
|
VI_UNLOCK(bp->b_vp);
|
|
bp->b_vp = (struct vnode *) 0;
|
|
bp->b_object = NULL;
|
|
bp->b_flags &= ~B_PAGING;
|
|
}
|
|
|
|
/*
|
|
* Reassign a buffer from one vnode to another.
|
|
* Used to assign file specific control information
|
|
* (indirect blocks) to the vnode to which they belong.
|
|
*/
|
|
void
|
|
reassignbuf(bp, newvp)
|
|
register struct buf *bp;
|
|
register struct vnode *newvp;
|
|
{
|
|
struct vnode *vp;
|
|
int delay;
|
|
|
|
if (newvp == NULL) {
|
|
printf("reassignbuf: NULL");
|
|
return;
|
|
}
|
|
vp = bp->b_vp;
|
|
++reassignbufcalls;
|
|
|
|
/*
|
|
* B_PAGING flagged buffers cannot be reassigned because their vp
|
|
* is not fully linked in.
|
|
*/
|
|
if (bp->b_flags & B_PAGING)
|
|
panic("cannot reassign paging buffer");
|
|
|
|
/*
|
|
* Delete from old vnode list, if on one.
|
|
*/
|
|
VI_LOCK(vp);
|
|
if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) {
|
|
buf_vlist_remove(bp);
|
|
if (vp != newvp) {
|
|
vdropl(bp->b_vp);
|
|
bp->b_vp = NULL; /* for clarification */
|
|
}
|
|
}
|
|
if (vp != newvp) {
|
|
VI_UNLOCK(vp);
|
|
VI_LOCK(newvp);
|
|
}
|
|
/*
|
|
* If dirty, put on list of dirty buffers; otherwise insert onto list
|
|
* of clean buffers.
|
|
*/
|
|
if (bp->b_flags & B_DELWRI) {
|
|
if ((newvp->v_iflag & VI_ONWORKLST) == 0) {
|
|
switch (newvp->v_type) {
|
|
case VDIR:
|
|
delay = dirdelay;
|
|
break;
|
|
case VCHR:
|
|
if (newvp->v_rdev->si_mountpoint != NULL) {
|
|
delay = metadelay;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
delay = filedelay;
|
|
}
|
|
vn_syncer_add_to_worklist(newvp, delay);
|
|
}
|
|
buf_vlist_add(bp, newvp, BX_VNDIRTY);
|
|
} else {
|
|
buf_vlist_add(bp, newvp, BX_VNCLEAN);
|
|
|
|
if ((newvp->v_iflag & VI_ONWORKLST) &&
|
|
TAILQ_EMPTY(&newvp->v_dirtyblkhd)) {
|
|
mtx_lock(&sync_mtx);
|
|
LIST_REMOVE(newvp, v_synclist);
|
|
mtx_unlock(&sync_mtx);
|
|
newvp->v_iflag &= ~VI_ONWORKLST;
|
|
}
|
|
}
|
|
if (bp->b_vp != newvp) {
|
|
bp->b_vp = newvp;
|
|
vholdl(bp->b_vp);
|
|
}
|
|
VI_UNLOCK(newvp);
|
|
}
|
|
|
|
/*
|
|
* Create a vnode for a device.
|
|
* Used for mounting the root filesystem.
|
|
*/
|
|
int
|
|
bdevvp(dev, vpp)
|
|
dev_t dev;
|
|
struct vnode **vpp;
|
|
{
|
|
register struct vnode *vp;
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
if (dev == NODEV) {
|
|
*vpp = NULLVP;
|
|
return (ENXIO);
|
|
}
|
|
if (vfinddev(dev, VCHR, vpp))
|
|
return (0);
|
|
error = getnewvnode("none", (struct mount *)0, spec_vnodeop_p, &nvp);
|
|
if (error) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
vp = nvp;
|
|
vp->v_type = VCHR;
|
|
addalias(vp, dev);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
v_incr_usecount(struct vnode *vp, int delta)
|
|
{
|
|
vp->v_usecount += delta;
|
|
if (vp->v_type == VCHR && vp->v_rdev != NULL) {
|
|
mtx_lock(&spechash_mtx);
|
|
vp->v_rdev->si_usecount += delta;
|
|
mtx_unlock(&spechash_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add vnode to the alias list hung off the dev_t.
|
|
*
|
|
* The reason for this gunk is that multiple vnodes can reference
|
|
* the same physical device, so checking vp->v_usecount to see
|
|
* how many users there are is inadequate; the v_usecount for
|
|
* the vnodes need to be accumulated. vcount() does that.
|
|
*/
|
|
struct vnode *
|
|
addaliasu(nvp, nvp_rdev)
|
|
struct vnode *nvp;
|
|
udev_t nvp_rdev;
|
|
{
|
|
struct vnode *ovp;
|
|
vop_t **ops;
|
|
dev_t dev;
|
|
|
|
if (nvp->v_type == VBLK)
|
|
return (nvp);
|
|
if (nvp->v_type != VCHR)
|
|
panic("addaliasu on non-special vnode");
|
|
dev = udev2dev(nvp_rdev, 0);
|
|
/*
|
|
* Check to see if we have a bdevvp vnode with no associated
|
|
* filesystem. If so, we want to associate the filesystem of
|
|
* the new newly instigated vnode with the bdevvp vnode and
|
|
* discard the newly created vnode rather than leaving the
|
|
* bdevvp vnode lying around with no associated filesystem.
|
|
*/
|
|
if (vfinddev(dev, nvp->v_type, &ovp) == 0 || ovp->v_data != NULL) {
|
|
addalias(nvp, dev);
|
|
return (nvp);
|
|
}
|
|
/*
|
|
* Discard unneeded vnode, but save its node specific data.
|
|
* Note that if there is a lock, it is carried over in the
|
|
* node specific data to the replacement vnode.
|
|
*/
|
|
vref(ovp);
|
|
ovp->v_data = nvp->v_data;
|
|
ovp->v_tag = nvp->v_tag;
|
|
nvp->v_data = NULL;
|
|
lockdestroy(ovp->v_vnlock);
|
|
lockinit(ovp->v_vnlock, PVFS, nvp->v_vnlock->lk_wmesg,
|
|
nvp->v_vnlock->lk_timo, nvp->v_vnlock->lk_flags & LK_EXTFLG_MASK);
|
|
ops = ovp->v_op;
|
|
ovp->v_op = nvp->v_op;
|
|
if (VOP_ISLOCKED(nvp, curthread)) {
|
|
VOP_UNLOCK(nvp, 0, curthread);
|
|
vn_lock(ovp, LK_EXCLUSIVE | LK_RETRY, curthread);
|
|
}
|
|
nvp->v_op = ops;
|
|
insmntque(ovp, nvp->v_mount);
|
|
vrele(nvp);
|
|
vgone(nvp);
|
|
return (ovp);
|
|
}
|
|
|
|
/* This is a local helper function that do the same as addaliasu, but for a
|
|
* dev_t instead of an udev_t. */
|
|
static void
|
|
addalias(nvp, dev)
|
|
struct vnode *nvp;
|
|
dev_t dev;
|
|
{
|
|
|
|
KASSERT(nvp->v_type == VCHR, ("addalias on non-special vnode"));
|
|
nvp->v_rdev = dev;
|
|
VI_LOCK(nvp);
|
|
mtx_lock(&spechash_mtx);
|
|
SLIST_INSERT_HEAD(&dev->si_hlist, nvp, v_specnext);
|
|
dev->si_usecount += nvp->v_usecount;
|
|
mtx_unlock(&spechash_mtx);
|
|
VI_UNLOCK(nvp);
|
|
}
|
|
|
|
/*
|
|
* Grab a particular vnode from the free list, increment its
|
|
* reference count and lock it. The vnode lock bit is set if the
|
|
* vnode is being eliminated in vgone. The process is awakened
|
|
* when the transition is completed, and an error returned to
|
|
* indicate that the vnode is no longer usable (possibly having
|
|
* been changed to a new filesystem type).
|
|
*/
|
|
int
|
|
vget(vp, flags, td)
|
|
register struct vnode *vp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* If the vnode is in the process of being cleaned out for
|
|
* another use, we wait for the cleaning to finish and then
|
|
* return failure. Cleaning is determined by checking that
|
|
* the VI_XLOCK flag is set.
|
|
*/
|
|
if ((flags & LK_INTERLOCK) == 0)
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_XLOCK && vp->v_vxproc != curthread) {
|
|
if ((flags & LK_NOWAIT) == 0) {
|
|
vp->v_iflag |= VI_XWANT;
|
|
msleep(vp, VI_MTX(vp), PINOD | PDROP, "vget", 0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
v_incr_usecount(vp, 1);
|
|
|
|
if (VSHOULDBUSY(vp))
|
|
vbusy(vp);
|
|
if (flags & LK_TYPE_MASK) {
|
|
if ((error = vn_lock(vp, flags | LK_INTERLOCK, td)) != 0) {
|
|
/*
|
|
* must expand vrele here because we do not want
|
|
* to call VOP_INACTIVE if the reference count
|
|
* drops back to zero since it was never really
|
|
* active. We must remove it from the free list
|
|
* before sleeping so that multiple processes do
|
|
* not try to recycle it.
|
|
*/
|
|
VI_LOCK(vp);
|
|
v_incr_usecount(vp, -1);
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
else
|
|
vlruvp(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
return (error);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Increase the reference count of a vnode.
|
|
*/
|
|
void
|
|
vref(struct vnode *vp)
|
|
{
|
|
VI_LOCK(vp);
|
|
v_incr_usecount(vp, 1);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
/*
|
|
* Return reference count of a vnode.
|
|
*
|
|
* The results of this call are only guaranteed when some mechanism other
|
|
* than the VI lock is used to stop other processes from gaining references
|
|
* to the vnode. This may be the case if the caller holds the only reference.
|
|
* This is also useful when stale data is acceptable as race conditions may
|
|
* be accounted for by some other means.
|
|
*/
|
|
int
|
|
vrefcnt(struct vnode *vp)
|
|
{
|
|
int usecnt;
|
|
|
|
VI_LOCK(vp);
|
|
usecnt = vp->v_usecount;
|
|
VI_UNLOCK(vp);
|
|
|
|
return (usecnt);
|
|
}
|
|
|
|
|
|
/*
|
|
* Vnode put/release.
|
|
* If count drops to zero, call inactive routine and return to freelist.
|
|
*/
|
|
void
|
|
vrele(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
|
|
KASSERT(vp != NULL, ("vrele: null vp"));
|
|
|
|
VI_LOCK(vp);
|
|
|
|
/* Skip this v_writecount check if we're going to panic below. */
|
|
KASSERT(vp->v_writecount < vp->v_usecount || vp->v_usecount < 1,
|
|
("vrele: missed vn_close"));
|
|
|
|
if (vp->v_usecount > 1 || ((vp->v_iflag & VI_DOINGINACT) &&
|
|
vp->v_usecount == 1)) {
|
|
v_incr_usecount(vp, -1);
|
|
VI_UNLOCK(vp);
|
|
|
|
return;
|
|
}
|
|
|
|
if (vp->v_usecount == 1) {
|
|
v_incr_usecount(vp, -1);
|
|
/*
|
|
* We must call VOP_INACTIVE with the node locked. Mark
|
|
* as VI_DOINGINACT to avoid recursion.
|
|
*/
|
|
if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) == 0) {
|
|
VI_LOCK(vp);
|
|
vp->v_iflag |= VI_DOINGINACT;
|
|
VI_UNLOCK(vp);
|
|
VOP_INACTIVE(vp, td);
|
|
VI_LOCK(vp);
|
|
KASSERT(vp->v_iflag & VI_DOINGINACT,
|
|
("vrele: lost VI_DOINGINACT"));
|
|
vp->v_iflag &= ~VI_DOINGINACT;
|
|
} else
|
|
VI_LOCK(vp);
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
else
|
|
vlruvp(vp);
|
|
VI_UNLOCK(vp);
|
|
|
|
} else {
|
|
#ifdef DIAGNOSTIC
|
|
vprint("vrele: negative ref count", vp);
|
|
#endif
|
|
VI_UNLOCK(vp);
|
|
panic("vrele: negative ref cnt");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release an already locked vnode. This give the same effects as
|
|
* unlock+vrele(), but takes less time and avoids releasing and
|
|
* re-aquiring the lock (as vrele() aquires the lock internally.)
|
|
*/
|
|
void
|
|
vput(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
KASSERT(vp != NULL, ("vput: null vp"));
|
|
VI_LOCK(vp);
|
|
/* Skip this v_writecount check if we're going to panic below. */
|
|
KASSERT(vp->v_writecount < vp->v_usecount || vp->v_usecount < 1,
|
|
("vput: missed vn_close"));
|
|
|
|
if (vp->v_usecount > 1 || ((vp->v_iflag & VI_DOINGINACT) &&
|
|
vp->v_usecount == 1)) {
|
|
v_incr_usecount(vp, -1);
|
|
VOP_UNLOCK(vp, LK_INTERLOCK, td);
|
|
return;
|
|
}
|
|
|
|
if (vp->v_usecount == 1) {
|
|
v_incr_usecount(vp, -1);
|
|
/*
|
|
* We must call VOP_INACTIVE with the node locked, so
|
|
* we just need to release the vnode mutex. Mark as
|
|
* as VI_DOINGINACT to avoid recursion.
|
|
*/
|
|
vp->v_iflag |= VI_DOINGINACT;
|
|
VI_UNLOCK(vp);
|
|
VOP_INACTIVE(vp, td);
|
|
VI_LOCK(vp);
|
|
KASSERT(vp->v_iflag & VI_DOINGINACT,
|
|
("vput: lost VI_DOINGINACT"));
|
|
vp->v_iflag &= ~VI_DOINGINACT;
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
else
|
|
vlruvp(vp);
|
|
VI_UNLOCK(vp);
|
|
|
|
} else {
|
|
#ifdef DIAGNOSTIC
|
|
vprint("vput: negative ref count", vp);
|
|
#endif
|
|
panic("vput: negative ref cnt");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Somebody doesn't want the vnode recycled.
|
|
*/
|
|
void
|
|
vhold(struct vnode *vp)
|
|
{
|
|
VI_LOCK(vp);
|
|
vholdl(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
void
|
|
vholdl(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
vp->v_holdcnt++;
|
|
if (VSHOULDBUSY(vp))
|
|
vbusy(vp);
|
|
}
|
|
|
|
/*
|
|
* Note that there is one less who cares about this vnode. vdrop() is the
|
|
* opposite of vhold().
|
|
*/
|
|
void
|
|
vdrop(struct vnode *vp)
|
|
{
|
|
VI_LOCK(vp);
|
|
vdropl(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
void
|
|
vdropl(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
if (vp->v_holdcnt <= 0)
|
|
panic("vdrop: holdcnt");
|
|
vp->v_holdcnt--;
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
else
|
|
vlruvp(vp);
|
|
}
|
|
|
|
/*
|
|
* Remove any vnodes in the vnode table belonging to mount point mp.
|
|
*
|
|
* If FORCECLOSE is not specified, there should not be any active ones,
|
|
* return error if any are found (nb: this is a user error, not a
|
|
* system error). If FORCECLOSE is specified, detach any active vnodes
|
|
* that are found.
|
|
*
|
|
* If WRITECLOSE is set, only flush out regular file vnodes open for
|
|
* writing.
|
|
*
|
|
* SKIPSYSTEM causes any vnodes marked VV_SYSTEM to be skipped.
|
|
*
|
|
* `rootrefs' specifies the base reference count for the root vnode
|
|
* of this filesystem. The root vnode is considered busy if its
|
|
* v_usecount exceeds this value. On a successful return, vflush()
|
|
* will call vrele() on the root vnode exactly rootrefs times.
|
|
* If the SKIPSYSTEM or WRITECLOSE flags are specified, rootrefs must
|
|
* be zero.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
static int busyprt = 0; /* print out busy vnodes */
|
|
SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, "");
|
|
#endif
|
|
|
|
int
|
|
vflush(mp, rootrefs, flags)
|
|
struct mount *mp;
|
|
int rootrefs;
|
|
int flags;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct vnode *vp, *nvp, *rootvp = NULL;
|
|
struct vattr vattr;
|
|
int busy = 0, error;
|
|
|
|
if (rootrefs > 0) {
|
|
KASSERT((flags & (SKIPSYSTEM | WRITECLOSE)) == 0,
|
|
("vflush: bad args"));
|
|
/*
|
|
* Get the filesystem root vnode. We can vput() it
|
|
* immediately, since with rootrefs > 0, it won't go away.
|
|
*/
|
|
if ((error = VFS_ROOT(mp, &rootvp)) != 0)
|
|
return (error);
|
|
vput(rootvp);
|
|
|
|
}
|
|
mtx_lock(&mntvnode_mtx);
|
|
loop:
|
|
for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) {
|
|
/*
|
|
* Make sure this vnode wasn't reclaimed in getnewvnode().
|
|
* Start over if it has (it won't be on the list anymore).
|
|
*/
|
|
if (vp->v_mount != mp)
|
|
goto loop;
|
|
nvp = TAILQ_NEXT(vp, v_nmntvnodes);
|
|
|
|
VI_LOCK(vp);
|
|
mtx_unlock(&mntvnode_mtx);
|
|
error = vn_lock(vp, LK_INTERLOCK | LK_EXCLUSIVE, td);
|
|
if (error) {
|
|
mtx_lock(&mntvnode_mtx);
|
|
goto loop;
|
|
}
|
|
/*
|
|
* Skip over a vnodes marked VV_SYSTEM.
|
|
*/
|
|
if ((flags & SKIPSYSTEM) && (vp->v_vflag & VV_SYSTEM)) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
mtx_lock(&mntvnode_mtx);
|
|
continue;
|
|
}
|
|
/*
|
|
* If WRITECLOSE is set, flush out unlinked but still open
|
|
* files (even if open only for reading) and regular file
|
|
* vnodes open for writing.
|
|
*/
|
|
if (flags & WRITECLOSE) {
|
|
error = VOP_GETATTR(vp, &vattr, td->td_ucred, td);
|
|
VI_LOCK(vp);
|
|
|
|
if ((vp->v_type == VNON ||
|
|
(error == 0 && vattr.va_nlink > 0)) &&
|
|
(vp->v_writecount == 0 || vp->v_type != VREG)) {
|
|
VOP_UNLOCK(vp, LK_INTERLOCK, td);
|
|
mtx_lock(&mntvnode_mtx);
|
|
continue;
|
|
}
|
|
} else
|
|
VI_LOCK(vp);
|
|
|
|
VOP_UNLOCK(vp, 0, td);
|
|
|
|
/*
|
|
* With v_usecount == 0, all we need to do is clear out the
|
|
* vnode data structures and we are done.
|
|
*/
|
|
if (vp->v_usecount == 0) {
|
|
vgonel(vp, td);
|
|
mtx_lock(&mntvnode_mtx);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If FORCECLOSE is set, forcibly close the vnode. For block
|
|
* or character devices, revert to an anonymous device. For
|
|
* all other files, just kill them.
|
|
*/
|
|
if (flags & FORCECLOSE) {
|
|
if (vp->v_type != VCHR)
|
|
vgonel(vp, td);
|
|
else
|
|
vgonechrl(vp, td);
|
|
mtx_lock(&mntvnode_mtx);
|
|
continue;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (busyprt)
|
|
vprint("vflush: busy vnode", vp);
|
|
#endif
|
|
VI_UNLOCK(vp);
|
|
mtx_lock(&mntvnode_mtx);
|
|
busy++;
|
|
}
|
|
mtx_unlock(&mntvnode_mtx);
|
|
if (rootrefs > 0 && (flags & FORCECLOSE) == 0) {
|
|
/*
|
|
* If just the root vnode is busy, and if its refcount
|
|
* is equal to `rootrefs', then go ahead and kill it.
|
|
*/
|
|
VI_LOCK(rootvp);
|
|
KASSERT(busy > 0, ("vflush: not busy"));
|
|
KASSERT(rootvp->v_usecount >= rootrefs, ("vflush: rootrefs"));
|
|
if (busy == 1 && rootvp->v_usecount == rootrefs) {
|
|
vgonel(rootvp, td);
|
|
busy = 0;
|
|
} else
|
|
VI_UNLOCK(rootvp);
|
|
}
|
|
if (busy)
|
|
return (EBUSY);
|
|
for (; rootrefs > 0; rootrefs--)
|
|
vrele(rootvp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This moves a now (likely recyclable) vnode to the end of the
|
|
* mountlist. XXX However, it is temporarily disabled until we
|
|
* can clean up ffs_sync() and friends, which have loop restart
|
|
* conditions which this code causes to operate O(N^2).
|
|
*/
|
|
static void
|
|
vlruvp(struct vnode *vp)
|
|
{
|
|
#if 0
|
|
struct mount *mp;
|
|
|
|
if ((mp = vp->v_mount) != NULL) {
|
|
mtx_lock(&mntvnode_mtx);
|
|
TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
|
|
mtx_unlock(&mntvnode_mtx);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
vx_lock(struct vnode *vp)
|
|
{
|
|
ASSERT_VI_LOCKED(vp, "vx_lock");
|
|
|
|
/*
|
|
* Prevent the vnode from being recycled or brought into use while we
|
|
* clean it out.
|
|
*/
|
|
if (vp->v_iflag & VI_XLOCK)
|
|
panic("vclean: deadlock");
|
|
vp->v_iflag |= VI_XLOCK;
|
|
vp->v_vxproc = curthread;
|
|
}
|
|
|
|
static void
|
|
vx_unlock(struct vnode *vp)
|
|
{
|
|
ASSERT_VI_LOCKED(vp, "vx_unlock");
|
|
vp->v_iflag &= ~VI_XLOCK;
|
|
vp->v_vxproc = NULL;
|
|
if (vp->v_iflag & VI_XWANT) {
|
|
vp->v_iflag &= ~VI_XWANT;
|
|
wakeup(vp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Disassociate the underlying filesystem from a vnode.
|
|
*/
|
|
static void
|
|
vclean(vp, flags, td)
|
|
struct vnode *vp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
int active;
|
|
|
|
ASSERT_VI_LOCKED(vp, "vclean");
|
|
/*
|
|
* Check to see if the vnode is in use. If so we have to reference it
|
|
* before we clean it out so that its count cannot fall to zero and
|
|
* generate a race against ourselves to recycle it.
|
|
*/
|
|
if ((active = vp->v_usecount))
|
|
v_incr_usecount(vp, 1);
|
|
|
|
/*
|
|
* Even if the count is zero, the VOP_INACTIVE routine may still
|
|
* have the object locked while it cleans it out. The VOP_LOCK
|
|
* ensures that the VOP_INACTIVE routine is done with its work.
|
|
* For active vnodes, it ensures that no other activity can
|
|
* occur while the underlying object is being cleaned out.
|
|
*/
|
|
VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, td);
|
|
|
|
/*
|
|
* Clean out any buffers associated with the vnode.
|
|
* If the flush fails, just toss the buffers.
|
|
*/
|
|
if (flags & DOCLOSE) {
|
|
struct buf *bp;
|
|
bp = TAILQ_FIRST(&vp->v_dirtyblkhd);
|
|
if (bp != NULL)
|
|
(void) vn_write_suspend_wait(vp, NULL, V_WAIT);
|
|
if (vinvalbuf(vp, V_SAVE, NOCRED, td, 0, 0) != 0)
|
|
vinvalbuf(vp, 0, NOCRED, td, 0, 0);
|
|
}
|
|
|
|
VOP_DESTROYVOBJECT(vp);
|
|
|
|
/*
|
|
* Any other processes trying to obtain this lock must first
|
|
* wait for VXLOCK to clear, then call the new lock operation.
|
|
*/
|
|
VOP_UNLOCK(vp, 0, td);
|
|
|
|
/*
|
|
* If purging an active vnode, it must be closed and
|
|
* deactivated before being reclaimed. Note that the
|
|
* VOP_INACTIVE will unlock the vnode.
|
|
*/
|
|
if (active) {
|
|
if (flags & DOCLOSE)
|
|
VOP_CLOSE(vp, FNONBLOCK, NOCRED, td);
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_DOINGINACT) == 0) {
|
|
vp->v_iflag |= VI_DOINGINACT;
|
|
VI_UNLOCK(vp);
|
|
if (vn_lock(vp, LK_EXCLUSIVE | LK_NOWAIT, td) != 0)
|
|
panic("vclean: cannot relock.");
|
|
VOP_INACTIVE(vp, td);
|
|
VI_LOCK(vp);
|
|
KASSERT(vp->v_iflag & VI_DOINGINACT,
|
|
("vclean: lost VI_DOINGINACT"));
|
|
vp->v_iflag &= ~VI_DOINGINACT;
|
|
}
|
|
VI_UNLOCK(vp);
|
|
}
|
|
/*
|
|
* Reclaim the vnode.
|
|
*/
|
|
if (VOP_RECLAIM(vp, td))
|
|
panic("vclean: cannot reclaim");
|
|
|
|
if (active) {
|
|
/*
|
|
* Inline copy of vrele() since VOP_INACTIVE
|
|
* has already been called.
|
|
*/
|
|
VI_LOCK(vp);
|
|
v_incr_usecount(vp, -1);
|
|
if (vp->v_usecount <= 0) {
|
|
#ifdef INVARIANTS
|
|
if (vp->v_usecount < 0 || vp->v_writecount != 0) {
|
|
vprint("vclean: bad ref count", vp);
|
|
panic("vclean: ref cnt");
|
|
}
|
|
#endif
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
}
|
|
/*
|
|
* Delete from old mount point vnode list.
|
|
*/
|
|
if (vp->v_mount != NULL)
|
|
insmntque(vp, (struct mount *)0);
|
|
cache_purge(vp);
|
|
VI_LOCK(vp);
|
|
if (VSHOULDFREE(vp))
|
|
vfree(vp);
|
|
|
|
/*
|
|
* Done with purge, reset to the standard lock and
|
|
* notify sleepers of the grim news.
|
|
*/
|
|
vp->v_vnlock = &vp->v_lock;
|
|
vp->v_op = dead_vnodeop_p;
|
|
if (vp->v_pollinfo != NULL)
|
|
vn_pollgone(vp);
|
|
vp->v_tag = "none";
|
|
}
|
|
|
|
/*
|
|
* Eliminate all activity associated with the requested vnode
|
|
* and with all vnodes aliased to the requested vnode.
|
|
*/
|
|
int
|
|
vop_revoke(ap)
|
|
struct vop_revoke_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp, *vq;
|
|
dev_t dev;
|
|
|
|
KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke"));
|
|
vp = ap->a_vp;
|
|
KASSERT((vp->v_type == VCHR), ("vop_revoke: not VCHR"));
|
|
|
|
VI_LOCK(vp);
|
|
/*
|
|
* If a vgone (or vclean) is already in progress,
|
|
* wait until it is done and return.
|
|
*/
|
|
if (vp->v_iflag & VI_XLOCK) {
|
|
vp->v_iflag |= VI_XWANT;
|
|
msleep(vp, VI_MTX(vp), PINOD | PDROP,
|
|
"vop_revokeall", 0);
|
|
return (0);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
dev = vp->v_rdev;
|
|
for (;;) {
|
|
mtx_lock(&spechash_mtx);
|
|
vq = SLIST_FIRST(&dev->si_hlist);
|
|
mtx_unlock(&spechash_mtx);
|
|
if (!vq)
|
|
break;
|
|
vgone(vq);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Recycle an unused vnode to the front of the free list.
|
|
* Release the passed interlock if the vnode will be recycled.
|
|
*/
|
|
int
|
|
vrecycle(vp, inter_lkp, td)
|
|
struct vnode *vp;
|
|
struct mtx *inter_lkp;
|
|
struct thread *td;
|
|
{
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_usecount == 0) {
|
|
if (inter_lkp) {
|
|
mtx_unlock(inter_lkp);
|
|
}
|
|
vgonel(vp, td);
|
|
return (1);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Eliminate all activity associated with a vnode
|
|
* in preparation for reuse.
|
|
*/
|
|
void
|
|
vgone(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
|
|
VI_LOCK(vp);
|
|
vgonel(vp, td);
|
|
}
|
|
|
|
/*
|
|
* Disassociate a character device from the its underlying filesystem and
|
|
* attach it to spec. This is for use when the chr device is still active
|
|
* and the filesystem is going away.
|
|
*/
|
|
static void
|
|
vgonechrl(struct vnode *vp, struct thread *td)
|
|
{
|
|
ASSERT_VI_LOCKED(vp, "vgonechrl");
|
|
vx_lock(vp);
|
|
vclean(vp, 0, td);
|
|
vp->v_op = spec_vnodeop_p;
|
|
vx_unlock(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
/*
|
|
* vgone, with the vp interlock held.
|
|
*/
|
|
void
|
|
vgonel(vp, td)
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
{
|
|
/*
|
|
* If a vgone (or vclean) is already in progress,
|
|
* wait until it is done and return.
|
|
*/
|
|
ASSERT_VI_LOCKED(vp, "vgonel");
|
|
if (vp->v_iflag & VI_XLOCK) {
|
|
vp->v_iflag |= VI_XWANT;
|
|
msleep(vp, VI_MTX(vp), PINOD | PDROP, "vgone", 0);
|
|
return;
|
|
}
|
|
vx_lock(vp);
|
|
|
|
/*
|
|
* Clean out the filesystem specific data.
|
|
*/
|
|
vclean(vp, DOCLOSE, td);
|
|
VI_UNLOCK(vp);
|
|
|
|
/*
|
|
* If special device, remove it from special device alias list
|
|
* if it is on one.
|
|
*/
|
|
VI_LOCK(vp);
|
|
if (vp->v_type == VCHR && vp->v_rdev != NULL && vp->v_rdev != NODEV) {
|
|
mtx_lock(&spechash_mtx);
|
|
SLIST_REMOVE(&vp->v_rdev->si_hlist, vp, vnode, v_specnext);
|
|
vp->v_rdev->si_usecount -= vp->v_usecount;
|
|
mtx_unlock(&spechash_mtx);
|
|
vp->v_rdev = NULL;
|
|
}
|
|
|
|
/*
|
|
* If it is on the freelist and not already at the head,
|
|
* move it to the head of the list. The test of the
|
|
* VDOOMED flag and the reference count of zero is because
|
|
* it will be removed from the free list by getnewvnode,
|
|
* but will not have its reference count incremented until
|
|
* after calling vgone. If the reference count were
|
|
* incremented first, vgone would (incorrectly) try to
|
|
* close the previous instance of the underlying object.
|
|
*/
|
|
if (vp->v_usecount == 0 && !(vp->v_iflag & VI_DOOMED)) {
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
if (vp->v_iflag & VI_FREE) {
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
} else {
|
|
vp->v_iflag |= VI_FREE;
|
|
freevnodes++;
|
|
}
|
|
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
}
|
|
|
|
vp->v_type = VBAD;
|
|
vx_unlock(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
/*
|
|
* Lookup a vnode by device number.
|
|
*/
|
|
int
|
|
vfinddev(dev, type, vpp)
|
|
dev_t dev;
|
|
enum vtype type;
|
|
struct vnode **vpp;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
mtx_lock(&spechash_mtx);
|
|
SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) {
|
|
if (type == vp->v_type) {
|
|
*vpp = vp;
|
|
mtx_unlock(&spechash_mtx);
|
|
return (1);
|
|
}
|
|
}
|
|
mtx_unlock(&spechash_mtx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Calculate the total number of references to a special device.
|
|
*/
|
|
int
|
|
vcount(vp)
|
|
struct vnode *vp;
|
|
{
|
|
int count;
|
|
|
|
mtx_lock(&spechash_mtx);
|
|
count = vp->v_rdev->si_usecount;
|
|
mtx_unlock(&spechash_mtx);
|
|
return (count);
|
|
}
|
|
|
|
/*
|
|
* Same as above, but using the dev_t as argument
|
|
*/
|
|
int
|
|
count_dev(dev)
|
|
dev_t dev;
|
|
{
|
|
int count;
|
|
|
|
mtx_lock(&spechash_mtx);
|
|
count = dev->si_usecount;
|
|
mtx_unlock(&spechash_mtx);
|
|
return(count);
|
|
}
|
|
|
|
/*
|
|
* Print out a description of a vnode.
|
|
*/
|
|
static char *typename[] =
|
|
{"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
|
|
|
|
void
|
|
vprint(label, vp)
|
|
char *label;
|
|
struct vnode *vp;
|
|
{
|
|
char buf[96];
|
|
|
|
if (label != NULL)
|
|
printf("%s: %p: ", label, (void *)vp);
|
|
else
|
|
printf("%p: ", (void *)vp);
|
|
printf("tag %s, type %s, usecount %d, writecount %d, refcount %d,",
|
|
vp->v_tag, typename[vp->v_type], vp->v_usecount,
|
|
vp->v_writecount, vp->v_holdcnt);
|
|
buf[0] = '\0';
|
|
if (vp->v_vflag & VV_ROOT)
|
|
strcat(buf, "|VV_ROOT");
|
|
if (vp->v_vflag & VV_TEXT)
|
|
strcat(buf, "|VV_TEXT");
|
|
if (vp->v_vflag & VV_SYSTEM)
|
|
strcat(buf, "|VV_SYSTEM");
|
|
if (vp->v_iflag & VI_XLOCK)
|
|
strcat(buf, "|VI_XLOCK");
|
|
if (vp->v_iflag & VI_XWANT)
|
|
strcat(buf, "|VI_XWANT");
|
|
if (vp->v_iflag & VI_BWAIT)
|
|
strcat(buf, "|VI_BWAIT");
|
|
if (vp->v_iflag & VI_DOOMED)
|
|
strcat(buf, "|VI_DOOMED");
|
|
if (vp->v_iflag & VI_FREE)
|
|
strcat(buf, "|VI_FREE");
|
|
if (vp->v_vflag & VV_OBJBUF)
|
|
strcat(buf, "|VV_OBJBUF");
|
|
if (buf[0] != '\0')
|
|
printf(" flags (%s),", &buf[1]);
|
|
lockmgr_printinfo(vp->v_vnlock);
|
|
printf("\n");
|
|
if (vp->v_data != NULL)
|
|
VOP_PRINT(vp);
|
|
}
|
|
|
|
#ifdef DDB
|
|
#include <ddb/ddb.h>
|
|
/*
|
|
* List all of the locked vnodes in the system.
|
|
* Called when debugging the kernel.
|
|
*/
|
|
DB_SHOW_COMMAND(lockedvnods, lockedvnodes)
|
|
{
|
|
struct mount *mp, *nmp;
|
|
struct vnode *vp;
|
|
|
|
/*
|
|
* Note: because this is DDB, we can't obey the locking semantics
|
|
* for these structures, which means we could catch an inconsistent
|
|
* state and dereference a nasty pointer. Not much to be done
|
|
* about that.
|
|
*/
|
|
printf("Locked vnodes\n");
|
|
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
|
|
nmp = TAILQ_NEXT(mp, mnt_list);
|
|
TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
|
|
if (VOP_ISLOCKED(vp, NULL))
|
|
vprint(NULL, vp);
|
|
}
|
|
nmp = TAILQ_NEXT(mp, mnt_list);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Fill in a struct xvfsconf based on a struct vfsconf.
|
|
*/
|
|
static void
|
|
vfsconf2x(struct vfsconf *vfsp, struct xvfsconf *xvfsp)
|
|
{
|
|
|
|
strcpy(xvfsp->vfc_name, vfsp->vfc_name);
|
|
xvfsp->vfc_typenum = vfsp->vfc_typenum;
|
|
xvfsp->vfc_refcount = vfsp->vfc_refcount;
|
|
xvfsp->vfc_flags = vfsp->vfc_flags;
|
|
/*
|
|
* These are unused in userland, we keep them
|
|
* to not break binary compatibility.
|
|
*/
|
|
xvfsp->vfc_vfsops = NULL;
|
|
xvfsp->vfc_next = NULL;
|
|
}
|
|
|
|
static int
|
|
sysctl_vfs_conflist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct vfsconf *vfsp;
|
|
struct xvfsconf *xvfsp;
|
|
int cnt, error, i;
|
|
|
|
cnt = 0;
|
|
for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
|
|
cnt++;
|
|
xvfsp = malloc(sizeof(struct xvfsconf) * cnt, M_TEMP, M_WAITOK);
|
|
/*
|
|
* Handle the race that we will have here when struct vfsconf
|
|
* will be locked down by using both cnt and checking vfc_next
|
|
* against NULL to determine the end of the loop. The race will
|
|
* happen because we will have to unlock before calling malloc().
|
|
* We are protected by Giant for now.
|
|
*/
|
|
i = 0;
|
|
for (vfsp = vfsconf; vfsp != NULL && i < cnt; vfsp = vfsp->vfc_next) {
|
|
vfsconf2x(vfsp, xvfsp + i);
|
|
i++;
|
|
}
|
|
error = SYSCTL_OUT(req, xvfsp, sizeof(struct xvfsconf) * i);
|
|
free(xvfsp, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_vfs, OID_AUTO, conflist, CTLFLAG_RD, NULL, 0, sysctl_vfs_conflist,
|
|
"S,xvfsconf", "List of all configured filesystems");
|
|
|
|
/*
|
|
* Top level filesystem related information gathering.
|
|
*/
|
|
static int sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS);
|
|
|
|
static int
|
|
vfs_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int *name = (int *)arg1 - 1; /* XXX */
|
|
u_int namelen = arg2 + 1; /* XXX */
|
|
struct vfsconf *vfsp;
|
|
struct xvfsconf xvfsp;
|
|
|
|
printf("WARNING: userland calling deprecated sysctl, "
|
|
"please rebuild world\n");
|
|
|
|
#if 1 || defined(COMPAT_PRELITE2)
|
|
/* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
|
|
if (namelen == 1)
|
|
return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
|
|
#endif
|
|
|
|
switch (name[1]) {
|
|
case VFS_MAXTYPENUM:
|
|
if (namelen != 2)
|
|
return (ENOTDIR);
|
|
return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int)));
|
|
case VFS_CONF:
|
|
if (namelen != 3)
|
|
return (ENOTDIR); /* overloaded */
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (vfsp->vfc_typenum == name[2])
|
|
break;
|
|
if (vfsp == NULL)
|
|
return (EOPNOTSUPP);
|
|
vfsconf2x(vfsp, &xvfsp);
|
|
return (SYSCTL_OUT(req, &xvfsp, sizeof(xvfsp)));
|
|
}
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD | CTLFLAG_SKIP, vfs_sysctl,
|
|
"Generic filesystem");
|
|
|
|
#if 1 || defined(COMPAT_PRELITE2)
|
|
|
|
static int
|
|
sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
struct vfsconf *vfsp;
|
|
struct ovfsconf ovfs;
|
|
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
|
|
ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
|
|
strcpy(ovfs.vfc_name, vfsp->vfc_name);
|
|
ovfs.vfc_index = vfsp->vfc_typenum;
|
|
ovfs.vfc_refcount = vfsp->vfc_refcount;
|
|
ovfs.vfc_flags = vfsp->vfc_flags;
|
|
error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
|
|
if (error)
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* 1 || COMPAT_PRELITE2 */
|
|
|
|
#define KINFO_VNODESLOP 10
|
|
#ifdef notyet
|
|
/*
|
|
* Dump vnode list (via sysctl).
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
sysctl_vnode(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xvnode *xvn;
|
|
struct thread *td = req->td;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
int error, len, n;
|
|
|
|
/*
|
|
* Stale numvnodes access is not fatal here.
|
|
*/
|
|
req->lock = 0;
|
|
len = (numvnodes + KINFO_VNODESLOP) * sizeof *xvn;
|
|
if (!req->oldptr)
|
|
/* Make an estimate */
|
|
return (SYSCTL_OUT(req, 0, len));
|
|
|
|
sysctl_wire_old_buffer(req, 0);
|
|
xvn = malloc(len, M_TEMP, M_ZERO | M_WAITOK);
|
|
n = 0;
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
|
|
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td))
|
|
continue;
|
|
mtx_lock(&mntvnode_mtx);
|
|
TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
|
|
if (n == len)
|
|
break;
|
|
vref(vp);
|
|
xvn[n].xv_size = sizeof *xvn;
|
|
xvn[n].xv_vnode = vp;
|
|
#define XV_COPY(field) xvn[n].xv_##field = vp->v_##field
|
|
XV_COPY(usecount);
|
|
XV_COPY(writecount);
|
|
XV_COPY(holdcnt);
|
|
XV_COPY(id);
|
|
XV_COPY(mount);
|
|
XV_COPY(numoutput);
|
|
XV_COPY(type);
|
|
#undef XV_COPY
|
|
xvn[n].xv_flag = vp->v_vflag;
|
|
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
case VLNK:
|
|
xvn[n].xv_dev = vp->v_cachedfs;
|
|
xvn[n].xv_ino = vp->v_cachedid;
|
|
break;
|
|
case VBLK:
|
|
case VCHR:
|
|
if (vp->v_rdev == NULL) {
|
|
vrele(vp);
|
|
continue;
|
|
}
|
|
xvn[n].xv_dev = dev2udev(vp->v_rdev);
|
|
break;
|
|
case VSOCK:
|
|
xvn[n].xv_socket = vp->v_socket;
|
|
break;
|
|
case VFIFO:
|
|
xvn[n].xv_fifo = vp->v_fifoinfo;
|
|
break;
|
|
case VNON:
|
|
case VBAD:
|
|
default:
|
|
/* shouldn't happen? */
|
|
vrele(vp);
|
|
continue;
|
|
}
|
|
vrele(vp);
|
|
++n;
|
|
}
|
|
mtx_unlock(&mntvnode_mtx);
|
|
mtx_lock(&mountlist_mtx);
|
|
vfs_unbusy(mp, td);
|
|
if (n == len)
|
|
break;
|
|
}
|
|
mtx_unlock(&mountlist_mtx);
|
|
|
|
error = SYSCTL_OUT(req, xvn, n * sizeof *xvn);
|
|
free(xvn, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD,
|
|
0, 0, sysctl_vnode, "S,xvnode", "");
|
|
#endif
|
|
|
|
/*
|
|
* Check to see if a filesystem is mounted on a block device.
|
|
*/
|
|
int
|
|
vfs_mountedon(vp)
|
|
struct vnode *vp;
|
|
{
|
|
|
|
if (vp->v_rdev->si_mountpoint != NULL)
|
|
return (EBUSY);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unmount all filesystems. The list is traversed in reverse order
|
|
* of mounting to avoid dependencies.
|
|
*/
|
|
void
|
|
vfs_unmountall()
|
|
{
|
|
struct mount *mp;
|
|
struct thread *td;
|
|
int error;
|
|
|
|
if (curthread != NULL)
|
|
td = curthread;
|
|
else
|
|
td = FIRST_THREAD_IN_PROC(initproc); /* XXX XXX proc0? */
|
|
/*
|
|
* Since this only runs when rebooting, it is not interlocked.
|
|
*/
|
|
while(!TAILQ_EMPTY(&mountlist)) {
|
|
mp = TAILQ_LAST(&mountlist, mntlist);
|
|
error = dounmount(mp, MNT_FORCE, td);
|
|
if (error) {
|
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
|
printf("unmount of %s failed (",
|
|
mp->mnt_stat.f_mntonname);
|
|
if (error == EBUSY)
|
|
printf("BUSY)\n");
|
|
else
|
|
printf("%d)\n", error);
|
|
} else {
|
|
/* The unmount has removed mp from the mountlist */
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* perform msync on all vnodes under a mount point
|
|
* the mount point must be locked.
|
|
*/
|
|
void
|
|
vfs_msync(struct mount *mp, int flags)
|
|
{
|
|
struct vnode *vp, *nvp;
|
|
struct vm_object *obj;
|
|
int tries;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
tries = 5;
|
|
mtx_lock(&mntvnode_mtx);
|
|
loop:
|
|
for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
|
|
if (vp->v_mount != mp) {
|
|
if (--tries > 0)
|
|
goto loop;
|
|
break;
|
|
}
|
|
nvp = TAILQ_NEXT(vp, v_nmntvnodes);
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_XLOCK) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
|
|
if ((vp->v_iflag & VI_OBJDIRTY) &&
|
|
(flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) {
|
|
mtx_unlock(&mntvnode_mtx);
|
|
if (!vget(vp,
|
|
LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK,
|
|
curthread)) {
|
|
if (vp->v_vflag & VV_NOSYNC) { /* unlinked */
|
|
vput(vp);
|
|
mtx_lock(&mntvnode_mtx);
|
|
continue;
|
|
}
|
|
|
|
if (VOP_GETVOBJECT(vp, &obj) == 0) {
|
|
VM_OBJECT_LOCK(obj);
|
|
vm_object_page_clean(obj, 0, 0,
|
|
flags == MNT_WAIT ?
|
|
OBJPC_SYNC : OBJPC_NOSYNC);
|
|
VM_OBJECT_UNLOCK(obj);
|
|
}
|
|
vput(vp);
|
|
}
|
|
mtx_lock(&mntvnode_mtx);
|
|
if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp) {
|
|
if (--tries > 0)
|
|
goto loop;
|
|
break;
|
|
}
|
|
} else
|
|
VI_UNLOCK(vp);
|
|
}
|
|
mtx_unlock(&mntvnode_mtx);
|
|
}
|
|
|
|
/*
|
|
* Create the VM object needed for VMIO and mmap support. This
|
|
* is done for all VREG files in the system. Some filesystems might
|
|
* afford the additional metadata buffering capability of the
|
|
* VMIO code by making the device node be VMIO mode also.
|
|
*
|
|
* vp must be locked when vfs_object_create is called.
|
|
*/
|
|
int
|
|
vfs_object_create(vp, td, cred)
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
struct ucred *cred;
|
|
{
|
|
GIANT_REQUIRED;
|
|
return (VOP_CREATEVOBJECT(vp, cred, td));
|
|
}
|
|
|
|
/*
|
|
* Mark a vnode as free, putting it up for recycling.
|
|
*/
|
|
void
|
|
vfree(vp)
|
|
struct vnode *vp;
|
|
{
|
|
ASSERT_VI_LOCKED(vp, "vfree");
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
KASSERT((vp->v_iflag & VI_FREE) == 0, ("vnode already free"));
|
|
if (vp->v_iflag & VI_AGE) {
|
|
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
|
} else {
|
|
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
|
}
|
|
freevnodes++;
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
vp->v_iflag &= ~VI_AGE;
|
|
vp->v_iflag |= VI_FREE;
|
|
}
|
|
|
|
/*
|
|
* Opposite of vfree() - mark a vnode as in use.
|
|
*/
|
|
void
|
|
vbusy(vp)
|
|
struct vnode *vp;
|
|
{
|
|
ASSERT_VI_LOCKED(vp, "vbusy");
|
|
KASSERT((vp->v_iflag & VI_FREE) != 0, ("vnode not free"));
|
|
|
|
mtx_lock(&vnode_free_list_mtx);
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
freevnodes--;
|
|
mtx_unlock(&vnode_free_list_mtx);
|
|
|
|
vp->v_iflag &= ~(VI_FREE|VI_AGE);
|
|
}
|
|
|
|
/*
|
|
* Record a process's interest in events which might happen to
|
|
* a vnode. Because poll uses the historic select-style interface
|
|
* internally, this routine serves as both the ``check for any
|
|
* pending events'' and the ``record my interest in future events''
|
|
* functions. (These are done together, while the lock is held,
|
|
* to avoid race conditions.)
|
|
*/
|
|
int
|
|
vn_pollrecord(vp, td, events)
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
short events;
|
|
{
|
|
|
|
if (vp->v_pollinfo == NULL)
|
|
v_addpollinfo(vp);
|
|
mtx_lock(&vp->v_pollinfo->vpi_lock);
|
|
if (vp->v_pollinfo->vpi_revents & events) {
|
|
/*
|
|
* This leaves events we are not interested
|
|
* in available for the other process which
|
|
* which presumably had requested them
|
|
* (otherwise they would never have been
|
|
* recorded).
|
|
*/
|
|
events &= vp->v_pollinfo->vpi_revents;
|
|
vp->v_pollinfo->vpi_revents &= ~events;
|
|
|
|
mtx_unlock(&vp->v_pollinfo->vpi_lock);
|
|
return events;
|
|
}
|
|
vp->v_pollinfo->vpi_events |= events;
|
|
selrecord(td, &vp->v_pollinfo->vpi_selinfo);
|
|
mtx_unlock(&vp->v_pollinfo->vpi_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Note the occurrence of an event. If the VN_POLLEVENT macro is used,
|
|
* it is possible for us to miss an event due to race conditions, but
|
|
* that condition is expected to be rare, so for the moment it is the
|
|
* preferred interface.
|
|
*/
|
|
void
|
|
vn_pollevent(vp, events)
|
|
struct vnode *vp;
|
|
short events;
|
|
{
|
|
|
|
if (vp->v_pollinfo == NULL)
|
|
v_addpollinfo(vp);
|
|
mtx_lock(&vp->v_pollinfo->vpi_lock);
|
|
if (vp->v_pollinfo->vpi_events & events) {
|
|
/*
|
|
* We clear vpi_events so that we don't
|
|
* call selwakeup() twice if two events are
|
|
* posted before the polling process(es) is
|
|
* awakened. This also ensures that we take at
|
|
* most one selwakeup() if the polling process
|
|
* is no longer interested. However, it does
|
|
* mean that only one event can be noticed at
|
|
* a time. (Perhaps we should only clear those
|
|
* event bits which we note?) XXX
|
|
*/
|
|
vp->v_pollinfo->vpi_events = 0; /* &= ~events ??? */
|
|
vp->v_pollinfo->vpi_revents |= events;
|
|
selwakeup(&vp->v_pollinfo->vpi_selinfo);
|
|
}
|
|
mtx_unlock(&vp->v_pollinfo->vpi_lock);
|
|
}
|
|
|
|
/*
|
|
* Wake up anyone polling on vp because it is being revoked.
|
|
* This depends on dead_poll() returning POLLHUP for correct
|
|
* behavior.
|
|
*/
|
|
void
|
|
vn_pollgone(vp)
|
|
struct vnode *vp;
|
|
{
|
|
|
|
mtx_lock(&vp->v_pollinfo->vpi_lock);
|
|
VN_KNOTE(vp, NOTE_REVOKE);
|
|
if (vp->v_pollinfo->vpi_events) {
|
|
vp->v_pollinfo->vpi_events = 0;
|
|
selwakeup(&vp->v_pollinfo->vpi_selinfo);
|
|
}
|
|
mtx_unlock(&vp->v_pollinfo->vpi_lock);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Routine to create and manage a filesystem syncer vnode.
|
|
*/
|
|
#define sync_close ((int (*)(struct vop_close_args *))nullop)
|
|
static int sync_fsync(struct vop_fsync_args *);
|
|
static int sync_inactive(struct vop_inactive_args *);
|
|
static int sync_reclaim(struct vop_reclaim_args *);
|
|
|
|
static vop_t **sync_vnodeop_p;
|
|
static struct vnodeopv_entry_desc sync_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_eopnotsupp },
|
|
{ &vop_close_desc, (vop_t *) sync_close }, /* close */
|
|
{ &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */
|
|
{ &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */
|
|
{ &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */
|
|
{ &vop_lock_desc, (vop_t *) vop_stdlock }, /* lock */
|
|
{ &vop_unlock_desc, (vop_t *) vop_stdunlock }, /* unlock */
|
|
{ &vop_islocked_desc, (vop_t *) vop_stdislocked }, /* islocked */
|
|
{ NULL, NULL }
|
|
};
|
|
static struct vnodeopv_desc sync_vnodeop_opv_desc =
|
|
{ &sync_vnodeop_p, sync_vnodeop_entries };
|
|
|
|
VNODEOP_SET(sync_vnodeop_opv_desc);
|
|
|
|
/*
|
|
* Create a new filesystem syncer vnode for the specified mount point.
|
|
*/
|
|
int
|
|
vfs_allocate_syncvnode(mp)
|
|
struct mount *mp;
|
|
{
|
|
struct vnode *vp;
|
|
static long start, incr, next;
|
|
int error;
|
|
|
|
/* Allocate a new vnode */
|
|
if ((error = getnewvnode("syncer", mp, sync_vnodeop_p, &vp)) != 0) {
|
|
mp->mnt_syncer = NULL;
|
|
return (error);
|
|
}
|
|
vp->v_type = VNON;
|
|
/*
|
|
* Place the vnode onto the syncer worklist. We attempt to
|
|
* scatter them about on the list so that they will go off
|
|
* at evenly distributed times even if all the filesystems
|
|
* are mounted at once.
|
|
*/
|
|
next += incr;
|
|
if (next == 0 || next > syncer_maxdelay) {
|
|
start /= 2;
|
|
incr /= 2;
|
|
if (start == 0) {
|
|
start = syncer_maxdelay / 2;
|
|
incr = syncer_maxdelay;
|
|
}
|
|
next = start;
|
|
}
|
|
VI_LOCK(vp);
|
|
vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0);
|
|
VI_UNLOCK(vp);
|
|
mp->mnt_syncer = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Do a lazy sync of the filesystem.
|
|
*/
|
|
static int
|
|
sync_fsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *syncvp = ap->a_vp;
|
|
struct mount *mp = syncvp->v_mount;
|
|
struct thread *td = ap->a_td;
|
|
int error, asyncflag;
|
|
|
|
/*
|
|
* We only need to do something if this is a lazy evaluation.
|
|
*/
|
|
if (ap->a_waitfor != MNT_LAZY)
|
|
return (0);
|
|
|
|
/*
|
|
* Move ourselves to the back of the sync list.
|
|
*/
|
|
VI_LOCK(syncvp);
|
|
vn_syncer_add_to_worklist(syncvp, syncdelay);
|
|
VI_UNLOCK(syncvp);
|
|
|
|
/*
|
|
* Walk the list of vnodes pushing all that are dirty and
|
|
* not already on the sync list.
|
|
*/
|
|
mtx_lock(&mountlist_mtx);
|
|
if (vfs_busy(mp, LK_EXCLUSIVE | LK_NOWAIT, &mountlist_mtx, td) != 0) {
|
|
mtx_unlock(&mountlist_mtx);
|
|
return (0);
|
|
}
|
|
if (vn_start_write(NULL, &mp, V_NOWAIT) != 0) {
|
|
vfs_unbusy(mp, td);
|
|
return (0);
|
|
}
|
|
asyncflag = mp->mnt_flag & MNT_ASYNC;
|
|
mp->mnt_flag &= ~MNT_ASYNC;
|
|
vfs_msync(mp, MNT_NOWAIT);
|
|
error = VFS_SYNC(mp, MNT_LAZY, ap->a_cred, td);
|
|
if (asyncflag)
|
|
mp->mnt_flag |= MNT_ASYNC;
|
|
vn_finished_write(mp);
|
|
vfs_unbusy(mp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* The syncer vnode is no referenced.
|
|
*/
|
|
static int
|
|
sync_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
|
|
VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
|
|
vgone(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The syncer vnode is no longer needed and is being decommissioned.
|
|
*
|
|
* Modifications to the worklist must be protected by sync_mtx.
|
|
*/
|
|
static int
|
|
sync_reclaim(ap)
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
VI_LOCK(vp);
|
|
vp->v_mount->mnt_syncer = NULL;
|
|
if (vp->v_iflag & VI_ONWORKLST) {
|
|
mtx_lock(&sync_mtx);
|
|
LIST_REMOVE(vp, v_synclist);
|
|
mtx_unlock(&sync_mtx);
|
|
vp->v_iflag &= ~VI_ONWORKLST;
|
|
}
|
|
VI_UNLOCK(vp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* extract the dev_t from a VCHR
|
|
*/
|
|
dev_t
|
|
vn_todev(vp)
|
|
struct vnode *vp;
|
|
{
|
|
if (vp->v_type != VCHR)
|
|
return (NODEV);
|
|
return (vp->v_rdev);
|
|
}
|
|
|
|
/*
|
|
* Check if vnode represents a disk device
|
|
*/
|
|
int
|
|
vn_isdisk(vp, errp)
|
|
struct vnode *vp;
|
|
int *errp;
|
|
{
|
|
int error;
|
|
|
|
error = 0;
|
|
if (vp->v_type != VCHR)
|
|
error = ENOTBLK;
|
|
else if (vp->v_rdev == NULL)
|
|
error = ENXIO;
|
|
else if (!(devsw(vp->v_rdev)->d_flags & D_DISK))
|
|
error = ENOTBLK;
|
|
if (errp != NULL)
|
|
*errp = error;
|
|
return (error == 0);
|
|
}
|
|
|
|
/*
|
|
* Free data allocated by namei(); see namei(9) for details.
|
|
*/
|
|
void
|
|
NDFREE(ndp, flags)
|
|
struct nameidata *ndp;
|
|
const u_int flags;
|
|
{
|
|
if (!(flags & NDF_NO_FREE_PNBUF) &&
|
|
(ndp->ni_cnd.cn_flags & HASBUF)) {
|
|
uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
|
|
ndp->ni_cnd.cn_flags &= ~HASBUF;
|
|
}
|
|
if (!(flags & NDF_NO_DVP_UNLOCK) &&
|
|
(ndp->ni_cnd.cn_flags & LOCKPARENT) &&
|
|
ndp->ni_dvp != ndp->ni_vp)
|
|
VOP_UNLOCK(ndp->ni_dvp, 0, ndp->ni_cnd.cn_thread);
|
|
if (!(flags & NDF_NO_DVP_RELE) &&
|
|
(ndp->ni_cnd.cn_flags & (LOCKPARENT|WANTPARENT))) {
|
|
vrele(ndp->ni_dvp);
|
|
ndp->ni_dvp = NULL;
|
|
}
|
|
if (!(flags & NDF_NO_VP_UNLOCK) &&
|
|
(ndp->ni_cnd.cn_flags & LOCKLEAF) && ndp->ni_vp)
|
|
VOP_UNLOCK(ndp->ni_vp, 0, ndp->ni_cnd.cn_thread);
|
|
if (!(flags & NDF_NO_VP_RELE) &&
|
|
ndp->ni_vp) {
|
|
vrele(ndp->ni_vp);
|
|
ndp->ni_vp = NULL;
|
|
}
|
|
if (!(flags & NDF_NO_STARTDIR_RELE) &&
|
|
(ndp->ni_cnd.cn_flags & SAVESTART)) {
|
|
vrele(ndp->ni_startdir);
|
|
ndp->ni_startdir = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Common filesystem object access control check routine. Accepts a
|
|
* vnode's type, "mode", uid and gid, requested access mode, credentials,
|
|
* and optional call-by-reference privused argument allowing vaccess()
|
|
* to indicate to the caller whether privilege was used to satisfy the
|
|
* request (obsoleted). Returns 0 on success, or an errno on failure.
|
|
*/
|
|
int
|
|
vaccess(type, file_mode, file_uid, file_gid, acc_mode, cred, privused)
|
|
enum vtype type;
|
|
mode_t file_mode;
|
|
uid_t file_uid;
|
|
gid_t file_gid;
|
|
mode_t acc_mode;
|
|
struct ucred *cred;
|
|
int *privused;
|
|
{
|
|
mode_t dac_granted;
|
|
#ifdef CAPABILITIES
|
|
mode_t cap_granted;
|
|
#endif
|
|
|
|
/*
|
|
* Look for a normal, non-privileged way to access the file/directory
|
|
* as requested. If it exists, go with that.
|
|
*/
|
|
|
|
if (privused != NULL)
|
|
*privused = 0;
|
|
|
|
dac_granted = 0;
|
|
|
|
/* Check the owner. */
|
|
if (cred->cr_uid == file_uid) {
|
|
dac_granted |= VADMIN;
|
|
if (file_mode & S_IXUSR)
|
|
dac_granted |= VEXEC;
|
|
if (file_mode & S_IRUSR)
|
|
dac_granted |= VREAD;
|
|
if (file_mode & S_IWUSR)
|
|
dac_granted |= (VWRITE | VAPPEND);
|
|
|
|
if ((acc_mode & dac_granted) == acc_mode)
|
|
return (0);
|
|
|
|
goto privcheck;
|
|
}
|
|
|
|
/* Otherwise, check the groups (first match) */
|
|
if (groupmember(file_gid, cred)) {
|
|
if (file_mode & S_IXGRP)
|
|
dac_granted |= VEXEC;
|
|
if (file_mode & S_IRGRP)
|
|
dac_granted |= VREAD;
|
|
if (file_mode & S_IWGRP)
|
|
dac_granted |= (VWRITE | VAPPEND);
|
|
|
|
if ((acc_mode & dac_granted) == acc_mode)
|
|
return (0);
|
|
|
|
goto privcheck;
|
|
}
|
|
|
|
/* Otherwise, check everyone else. */
|
|
if (file_mode & S_IXOTH)
|
|
dac_granted |= VEXEC;
|
|
if (file_mode & S_IROTH)
|
|
dac_granted |= VREAD;
|
|
if (file_mode & S_IWOTH)
|
|
dac_granted |= (VWRITE | VAPPEND);
|
|
if ((acc_mode & dac_granted) == acc_mode)
|
|
return (0);
|
|
|
|
privcheck:
|
|
if (!suser_cred(cred, PRISON_ROOT)) {
|
|
/* XXX audit: privilege used */
|
|
if (privused != NULL)
|
|
*privused = 1;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef CAPABILITIES
|
|
/*
|
|
* Build a capability mask to determine if the set of capabilities
|
|
* satisfies the requirements when combined with the granted mask
|
|
* from above.
|
|
* For each capability, if the capability is required, bitwise
|
|
* or the request type onto the cap_granted mask.
|
|
*/
|
|
cap_granted = 0;
|
|
|
|
if (type == VDIR) {
|
|
/*
|
|
* For directories, use CAP_DAC_READ_SEARCH to satisfy
|
|
* VEXEC requests, instead of CAP_DAC_EXECUTE.
|
|
*/
|
|
if ((acc_mode & VEXEC) && ((dac_granted & VEXEC) == 0) &&
|
|
!cap_check(cred, NULL, CAP_DAC_READ_SEARCH, PRISON_ROOT))
|
|
cap_granted |= VEXEC;
|
|
} else {
|
|
if ((acc_mode & VEXEC) && ((dac_granted & VEXEC) == 0) &&
|
|
!cap_check(cred, NULL, CAP_DAC_EXECUTE, PRISON_ROOT))
|
|
cap_granted |= VEXEC;
|
|
}
|
|
|
|
if ((acc_mode & VREAD) && ((dac_granted & VREAD) == 0) &&
|
|
!cap_check(cred, NULL, CAP_DAC_READ_SEARCH, PRISON_ROOT))
|
|
cap_granted |= VREAD;
|
|
|
|
if ((acc_mode & VWRITE) && ((dac_granted & VWRITE) == 0) &&
|
|
!cap_check(cred, NULL, CAP_DAC_WRITE, PRISON_ROOT))
|
|
cap_granted |= (VWRITE | VAPPEND);
|
|
|
|
if ((acc_mode & VADMIN) && ((dac_granted & VADMIN) == 0) &&
|
|
!cap_check(cred, NULL, CAP_FOWNER, PRISON_ROOT))
|
|
cap_granted |= VADMIN;
|
|
|
|
if ((acc_mode & (cap_granted | dac_granted)) == acc_mode) {
|
|
/* XXX audit: privilege used */
|
|
if (privused != NULL)
|
|
*privused = 1;
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
return ((acc_mode & VADMIN) ? EPERM : EACCES);
|
|
}
|
|
|
|
/*
|
|
* Credential check based on process requesting service, and per-attribute
|
|
* permissions.
|
|
*/
|
|
int
|
|
extattr_check_cred(struct vnode *vp, int attrnamespace,
|
|
struct ucred *cred, struct thread *td, int access)
|
|
{
|
|
|
|
/*
|
|
* Kernel-invoked always succeeds.
|
|
*/
|
|
if (cred == NOCRED)
|
|
return (0);
|
|
|
|
/*
|
|
* Do not allow privileged processes in jail to directly
|
|
* manipulate system attributes.
|
|
*
|
|
* XXX What capability should apply here?
|
|
* Probably CAP_SYS_SETFFLAG.
|
|
*/
|
|
switch (attrnamespace) {
|
|
case EXTATTR_NAMESPACE_SYSTEM:
|
|
/* Potentially should be: return (EPERM); */
|
|
return (suser_cred(cred, 0));
|
|
case EXTATTR_NAMESPACE_USER:
|
|
return (VOP_ACCESS(vp, access, cred, td));
|
|
default:
|
|
return (EPERM);
|
|
}
|
|
}
|