Instead of requiring all implementations of vfs_quotactl to unbusy the mount for Q_QUOTAON and Q_QUOTAOFF, add an "mp_busy" in/out param to VFS_QUOTACTL(9). The implementation may then indicate to the caller whether it needed to unbusy the mount. Reviewed By: kib, markj Differential Revision: https://reviews.freebsd.org/D30218
596 lines
16 KiB
C
596 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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*
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* This code is derived from software contributed
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* to Berkeley by John Heidemann of the UCLA Ficus project.
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*
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* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
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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. 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_init.c 8.3 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/fnv_hash.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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static int vfs_register(struct vfsconf *);
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static int vfs_unregister(struct vfsconf *);
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MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
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/*
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* The highest defined VFS number.
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*/
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int maxvfsconf = VFS_GENERIC + 1;
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/*
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* Single-linked list of configured VFSes.
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* New entries are added/deleted by vfs_register()/vfs_unregister()
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*/
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struct vfsconfhead vfsconf = TAILQ_HEAD_INITIALIZER(vfsconf);
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struct sx vfsconf_sx;
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SX_SYSINIT(vfsconf, &vfsconf_sx, "vfsconf");
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/*
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* Loader.conf variable vfs.typenumhash enables setting vfc_typenum using a hash
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* calculation on vfc_name, so that it doesn't change when file systems are
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* loaded in a different order. This will avoid the NFS server file handles from
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* changing for file systems that use vfc_typenum in their fsid.
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*/
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static int vfs_typenumhash = 1;
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SYSCTL_INT(_vfs, OID_AUTO, typenumhash, CTLFLAG_RDTUN, &vfs_typenumhash, 0,
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"Set vfc_typenum using a hash calculation on vfc_name, so that it does not"
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"change when file systems are loaded in a different order.");
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/*
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* A Zen vnode attribute structure.
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*
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* Initialized when the first filesystem registers by vfs_register().
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*/
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struct vattr va_null;
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/*
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* vfs_init.c
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*
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* Allocate and fill in operations vectors.
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*
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* An undocumented feature of this approach to defining operations is that
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* there can be multiple entries in vfs_opv_descs for the same operations
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* vector. This allows third parties to extend the set of operations
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* supported by another layer in a binary compatibile way. For example,
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* assume that NFS needed to be modified to support Ficus. NFS has an entry
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* (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
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* default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
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* listing those new operations Ficus adds to NFS, all without modifying the
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* NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
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* that is a(whole)nother story.) This is a feature.
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*/
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/*
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* Routines having to do with the management of the vnode table.
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*/
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static struct vfsconf *
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vfs_byname_locked(const char *name)
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{
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struct vfsconf *vfsp;
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sx_assert(&vfsconf_sx, SA_LOCKED);
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if (!strcmp(name, "ffs"))
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name = "ufs";
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TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) {
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if (!strcmp(name, vfsp->vfc_name))
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return (vfsp);
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}
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return (NULL);
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}
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struct vfsconf *
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vfs_byname(const char *name)
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{
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struct vfsconf *vfsp;
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vfsconf_slock();
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vfsp = vfs_byname_locked(name);
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vfsconf_sunlock();
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return (vfsp);
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}
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struct vfsconf *
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vfs_byname_kld(const char *fstype, struct thread *td, int *error)
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{
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struct vfsconf *vfsp;
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int fileid, loaded;
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vfsp = vfs_byname(fstype);
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if (vfsp != NULL)
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return (vfsp);
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/* Try to load the respective module. */
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*error = kern_kldload(td, fstype, &fileid);
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loaded = (*error == 0);
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if (*error == EEXIST)
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*error = 0;
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if (*error)
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return (NULL);
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/* Look up again to see if the VFS was loaded. */
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vfsp = vfs_byname(fstype);
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if (vfsp == NULL) {
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if (loaded)
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(void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
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*error = ENODEV;
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return (NULL);
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}
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return (vfsp);
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}
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static int
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vfs_mount_sigdefer(struct mount *mp)
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{
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int prev_stops, rc;
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TSRAW(curthread, TS_ENTER, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_mount)(mp);
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sigallowstop(prev_stops);
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TSRAW(curthread, TS_EXIT, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
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return (rc);
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}
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static int
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vfs_unmount_sigdefer(struct mount *mp, int mntflags)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unmount)(mp, mntflags);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_root_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_root)(mp, flags, vpp);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_cachedroot_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_cachedroot)(mp, flags, vpp);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_quotactl_sigdefer(struct mount *mp, int cmd, uid_t uid, void *arg,
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bool *mp_busy)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_quotactl)(mp, cmd, uid, arg,
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mp_busy);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_statfs_sigdefer(struct mount *mp, struct statfs *sbp)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_statfs)(mp, sbp);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_sync_sigdefer(struct mount *mp, int waitfor)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sync)(mp, waitfor);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_vget_sigdefer(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_vget)(mp, ino, flags, vpp);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_fhtovp_sigdefer(struct mount *mp, struct fid *fidp, int flags,
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struct vnode **vpp)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_fhtovp)(mp, fidp, flags, vpp);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_checkexp_sigdefer(struct mount *mp, struct sockaddr *nam, uint64_t *exflg,
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struct ucred **credp, int *numsecflavors, int *secflavors)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_checkexp)(mp, nam, exflg, credp,
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numsecflavors, secflavors);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_extattrctl_sigdefer(struct mount *mp, int cmd, struct vnode *filename_vp,
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int attrnamespace, const char *attrname)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_extattrctl)(mp, cmd,
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filename_vp, attrnamespace, attrname);
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sigallowstop(prev_stops);
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return (rc);
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}
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static int
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vfs_sysctl_sigdefer(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
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{
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int prev_stops, rc;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sysctl)(mp, op, req);
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sigallowstop(prev_stops);
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return (rc);
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}
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static void
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vfs_susp_clean_sigdefer(struct mount *mp)
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{
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int prev_stops;
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if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean == NULL)
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return;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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(*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean)(mp);
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sigallowstop(prev_stops);
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}
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static void
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vfs_reclaim_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
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{
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int prev_stops;
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if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp == NULL)
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return;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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(*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp)(mp, vp);
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sigallowstop(prev_stops);
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}
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static void
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vfs_unlink_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
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{
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int prev_stops;
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if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp == NULL)
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return;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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(*(mp)->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp)(mp, vp);
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sigallowstop(prev_stops);
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}
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static void
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vfs_purge_sigdefer(struct mount *mp)
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{
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int prev_stops;
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prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
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(*mp->mnt_vfc->vfc_vfsops_sd->vfs_purge)(mp);
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sigallowstop(prev_stops);
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}
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static struct vfsops vfsops_sigdefer = {
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.vfs_mount = vfs_mount_sigdefer,
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.vfs_unmount = vfs_unmount_sigdefer,
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.vfs_root = vfs_root_sigdefer,
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.vfs_cachedroot = vfs_cachedroot_sigdefer,
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.vfs_quotactl = vfs_quotactl_sigdefer,
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.vfs_statfs = vfs_statfs_sigdefer,
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.vfs_sync = vfs_sync_sigdefer,
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.vfs_vget = vfs_vget_sigdefer,
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.vfs_fhtovp = vfs_fhtovp_sigdefer,
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.vfs_checkexp = vfs_checkexp_sigdefer,
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.vfs_extattrctl = vfs_extattrctl_sigdefer,
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.vfs_sysctl = vfs_sysctl_sigdefer,
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.vfs_susp_clean = vfs_susp_clean_sigdefer,
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.vfs_reclaim_lowervp = vfs_reclaim_lowervp_sigdefer,
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.vfs_unlink_lowervp = vfs_unlink_lowervp_sigdefer,
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.vfs_purge = vfs_purge_sigdefer,
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};
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/* Register a new filesystem type in the global table */
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static int
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vfs_register(struct vfsconf *vfc)
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{
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struct sysctl_oid *oidp;
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struct vfsops *vfsops;
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static int once;
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struct vfsconf *tvfc;
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uint32_t hashval;
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int secondpass;
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if (!once) {
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vattr_null(&va_null);
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once = 1;
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}
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if (vfc->vfc_version != VFS_VERSION) {
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printf("ERROR: filesystem %s, unsupported ABI version %x\n",
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vfc->vfc_name, vfc->vfc_version);
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return (EINVAL);
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}
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vfsconf_lock();
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if (vfs_byname_locked(vfc->vfc_name) != NULL) {
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vfsconf_unlock();
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return (EEXIST);
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}
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if (vfs_typenumhash != 0) {
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/*
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* Calculate a hash on vfc_name to use for vfc_typenum. Unless
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* all of 1<->255 are assigned, it is limited to 8bits since
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* that is what ZFS uses from vfc_typenum and is also the
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* preferred range for vfs_getnewfsid().
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*/
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hashval = fnv_32_str(vfc->vfc_name, FNV1_32_INIT);
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hashval &= 0xff;
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secondpass = 0;
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do {
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/* Look for and fix any collision. */
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TAILQ_FOREACH(tvfc, &vfsconf, vfc_list) {
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if (hashval == tvfc->vfc_typenum) {
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if (hashval == 255 && secondpass == 0) {
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hashval = 1;
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secondpass = 1;
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} else
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hashval++;
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break;
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}
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}
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} while (tvfc != NULL);
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vfc->vfc_typenum = hashval;
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if (vfc->vfc_typenum >= maxvfsconf)
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maxvfsconf = vfc->vfc_typenum + 1;
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} else
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vfc->vfc_typenum = maxvfsconf++;
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TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);
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/*
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* Initialise unused ``struct vfsops'' fields, to use
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* the vfs_std*() functions. Note, we need the mount
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* and unmount operations, at the least. The check
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* for vfsops available is just a debugging aid.
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*/
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KASSERT(vfc->vfc_vfsops != NULL,
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("Filesystem %s has no vfsops", vfc->vfc_name));
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/*
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* Check the mount and unmount operations.
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*/
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vfsops = vfc->vfc_vfsops;
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KASSERT(vfsops->vfs_mount != NULL,
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("Filesystem %s has no mount op", vfc->vfc_name));
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KASSERT(vfsops->vfs_unmount != NULL,
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("Filesystem %s has no unmount op", vfc->vfc_name));
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if (vfsops->vfs_root == NULL)
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/* return file system's root vnode */
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vfsops->vfs_root = vfs_stdroot;
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if (vfsops->vfs_quotactl == NULL)
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/* quota control */
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vfsops->vfs_quotactl = vfs_stdquotactl;
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if (vfsops->vfs_statfs == NULL)
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/* return file system's status */
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vfsops->vfs_statfs = vfs_stdstatfs;
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if (vfsops->vfs_sync == NULL)
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/*
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* flush unwritten data (nosync)
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* file systems can use vfs_stdsync
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* explicitly by setting it in the
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* vfsop vector.
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*/
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vfsops->vfs_sync = vfs_stdnosync;
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if (vfsops->vfs_vget == NULL)
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/* convert an inode number to a vnode */
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vfsops->vfs_vget = vfs_stdvget;
|
|
if (vfsops->vfs_fhtovp == NULL)
|
|
/* turn an NFS file handle into a vnode */
|
|
vfsops->vfs_fhtovp = vfs_stdfhtovp;
|
|
if (vfsops->vfs_checkexp == NULL)
|
|
/* check if file system is exported */
|
|
vfsops->vfs_checkexp = vfs_stdcheckexp;
|
|
if (vfsops->vfs_init == NULL)
|
|
/* file system specific initialisation */
|
|
vfsops->vfs_init = vfs_stdinit;
|
|
if (vfsops->vfs_uninit == NULL)
|
|
/* file system specific uninitialisation */
|
|
vfsops->vfs_uninit = vfs_stduninit;
|
|
if (vfsops->vfs_extattrctl == NULL)
|
|
/* extended attribute control */
|
|
vfsops->vfs_extattrctl = vfs_stdextattrctl;
|
|
if (vfsops->vfs_sysctl == NULL)
|
|
vfsops->vfs_sysctl = vfs_stdsysctl;
|
|
|
|
if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
|
|
vfc->vfc_vfsops_sd = vfc->vfc_vfsops;
|
|
vfc->vfc_vfsops = &vfsops_sigdefer;
|
|
}
|
|
|
|
if (vfc->vfc_flags & VFCF_JAIL)
|
|
prison_add_vfs(vfc);
|
|
|
|
/*
|
|
* Call init function for this VFS...
|
|
*/
|
|
if ((vfc->vfc_flags & VFCF_SBDRY) != 0)
|
|
vfc->vfc_vfsops_sd->vfs_init(vfc);
|
|
else
|
|
vfc->vfc_vfsops->vfs_init(vfc);
|
|
vfsconf_unlock();
|
|
|
|
/*
|
|
* If this filesystem has a sysctl node under vfs
|
|
* (i.e. vfs.xxfs), then change the oid number of that node to
|
|
* match the filesystem's type number. This allows user code
|
|
* which uses the type number to read sysctl variables defined
|
|
* by the filesystem to continue working. Since the oids are
|
|
* in a sorted list, we need to make sure the order is
|
|
* preserved by re-registering the oid after modifying its
|
|
* number.
|
|
*/
|
|
sysctl_wlock();
|
|
SLIST_FOREACH(oidp, SYSCTL_CHILDREN(&sysctl___vfs), oid_link) {
|
|
if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
|
|
sysctl_unregister_oid(oidp);
|
|
oidp->oid_number = vfc->vfc_typenum;
|
|
sysctl_register_oid(oidp);
|
|
break;
|
|
}
|
|
}
|
|
sysctl_wunlock();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Remove registration of a filesystem type */
|
|
static int
|
|
vfs_unregister(struct vfsconf *vfc)
|
|
{
|
|
struct vfsconf *vfsp;
|
|
int error, maxtypenum;
|
|
|
|
vfsconf_lock();
|
|
vfsp = vfs_byname_locked(vfc->vfc_name);
|
|
if (vfsp == NULL) {
|
|
vfsconf_unlock();
|
|
return (EINVAL);
|
|
}
|
|
if (vfsp->vfc_refcount != 0) {
|
|
vfsconf_unlock();
|
|
return (EBUSY);
|
|
}
|
|
error = 0;
|
|
if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
|
|
if (vfc->vfc_vfsops_sd->vfs_uninit != NULL)
|
|
error = vfc->vfc_vfsops_sd->vfs_uninit(vfsp);
|
|
} else {
|
|
if (vfc->vfc_vfsops->vfs_uninit != NULL) {
|
|
error = vfc->vfc_vfsops->vfs_uninit(vfsp);
|
|
}
|
|
if (error != 0) {
|
|
vfsconf_unlock();
|
|
return (error);
|
|
}
|
|
}
|
|
TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
|
|
maxtypenum = VFS_GENERIC;
|
|
TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
|
|
if (maxtypenum < vfsp->vfc_typenum)
|
|
maxtypenum = vfsp->vfc_typenum;
|
|
maxvfsconf = maxtypenum + 1;
|
|
vfsconf_unlock();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Standard kernel module handling code for filesystem modules.
|
|
* Referenced from VFS_SET().
|
|
*/
|
|
int
|
|
vfs_modevent(module_t mod, int type, void *data)
|
|
{
|
|
struct vfsconf *vfc;
|
|
int error = 0;
|
|
|
|
vfc = (struct vfsconf *)data;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
if (vfc)
|
|
error = vfs_register(vfc);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
if (vfc)
|
|
error = vfs_unregister(vfc);
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|