freebsd-dev/sys/fs/umapfs/umap_vfsops.c

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/*
* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* the UCLA Ficus project.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
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*
1999-08-28 01:08:13 +00:00
* $FreeBSD$
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*/
/*
* Umap Layer
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* (See mount_umapfs(8) for a description of this layer.)
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*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
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#include <sys/mount.h>
#include <sys/mutex.h>
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#include <sys/namei.h>
#include <sys/vnode.h>
#include <fs/umapfs/umap.h>
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static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
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static int umapfs_fhtovp(struct mount *mp, struct fid *fidp,
struct vnode **vpp);
static int umapfs_checkexp(struct mount *mp, struct sockaddr *nam,
int *extflagsp, struct ucred **credanonp);
static int umapfs_mount(struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct thread *td);
static int umapfs_quotactl(struct mount *mp, int cmd, uid_t uid,
caddr_t arg, struct thread *td);
static int umapfs_root(struct mount *mp, struct vnode **vpp);
static int umapfs_start(struct mount *mp, int flags, struct thread *td);
static int umapfs_statfs(struct mount *mp, struct statfs *sbp,
struct thread *td);
static int umapfs_unmount(struct mount *mp, int mntflags,
struct thread *td);
static int umapfs_vget(struct mount *mp, ino_t ino, int flags,
struct vnode **vpp);
static int umapfs_vptofh(struct vnode *vp, struct fid *fhp);
static int umapfs_extattrctl(struct mount *mp, int cmd,
o Change the API and ABI of the Extended Attribute kernel interfaces to introduce a new argument, "namespace", rather than relying on a first- character namespace indicator. This is in line with more recent thinking on EA interfaces on various mailing lists, including the posix1e, Linux acl-devel, and trustedbsd-discuss forums. Two namespaces are defined by default, EXTATTR_NAMESPACE_SYSTEM and EXTATTR_NAMESPACE_USER, where the primary distinction lies in the access control model: user EAs are accessible based on the normal MAC and DAC file/directory protections, and system attributes are limited to kernel-originated or appropriately privileged userland requests. o These API changes occur at several levels: the namespace argument is introduced in the extattr_{get,set}_file() system call interfaces, at the vnode operation level in the vop_{get,set}extattr() interfaces, and in the UFS extended attribute implementation. Changes are also introduced in the VFS extattrctl() interface (system call, VFS, and UFS implementation), where the arguments are modified to include a namespace field, as well as modified to advoid direct access to userspace variables from below the VFS layer (in the style of recent changes to mount by adrian@FreeBSD.org). This required some cleanup and bug fixing regarding VFS locks and the VFS interface, as a vnode pointer may now be optionally submitted to the VFS_EXTATTRCTL() call. Updated documentation for the VFS interface will be committed shortly. o In the near future, the auto-starting feature will be updated to search two sub-directories to the ".attribute" directory in appropriate file systems: "user" and "system" to locate attributes intended for those namespaces, as the single filename is no longer sufficient to indicate what namespace the attribute is intended for. Until this is committed, all attributes auto-started by UFS will be placed in the EXTATTR_NAMESPACE_SYSTEM namespace. o The default POSIX.1e attribute names for ACLs and Capabilities have been updated to no longer include the '$' in their filename. As such, if you're using these features, you'll need to rename the attribute backing files to the same names without '$' symbols in front. o Note that these changes will require changes in userland, which will be committed shortly. These include modifications to the extended attribute utilities, as well as to libutil for new namespace string conversion routines. Once the matching userland changes are committed, a buildworld is recommended to update all the necessary include files and verify that the kernel and userland environments are in sync. Note: If you do not use extended attributes (most people won't), upgrading is not imperative although since the system call API has changed, the new userland extended attribute code will no longer compile with old include files. o Couple of minor cleanups while I'm there: make more code compilation conditional on FFS_EXTATTR, which should recover a bit of space on kernels running without EA's, as well as update copyright dates. Obtained from: TrustedBSD Project
2001-03-15 02:54:29 +00:00
struct vnode *filename_vp,
int namespace, const char *attrname,
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struct thread *td);
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/*
* Mount umap layer
*/
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static int
umapfs_mount(mp, path, data, ndp, td)
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struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct thread *td;
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{
struct umap_args args;
struct vnode *lowerrootvp, *vp;
struct vnode *umapm_rootvp;
struct umap_mount *amp;
size_t size;
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int error;
#ifdef DEBUG
int i;
#endif
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/*
* Only for root
*/
if ((error = suser(td)) != 0)
return (error);
#ifdef DEBUG
printf("umapfs_mount(mp = %p)\n", (void *)mp);
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#endif
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE) {
return (EOPNOTSUPP);
/* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, td));*/
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}
/*
* Get argument
*/
error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
if (error)
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return (error);
/*
* Find lower node
*/
NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
UIO_USERSPACE, args.target, td);
error = namei(ndp);
if (error)
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return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
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/*
* Sanity check on lower vnode
*/
lowerrootvp = ndp->ni_vp;
#ifdef DEBUG
printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
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#endif
vrele(ndp->ni_dvp);
ndp->ni_dvp = 0;
if (lowerrootvp->v_type != VDIR) {
vput(lowerrootvp);
return (EINVAL);
}
#ifdef DEBUG
printf("mp = %p\n", (void *)mp);
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#endif
amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
M_UMAPFSMNT, M_WAITOK); /* XXX */
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/*
* Save reference to underlying FS
*/
amp->umapm_vfs = lowerrootvp->v_mount;
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/*
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* Now copy in the number of entries and maps for umap mapping.
*/
if (args.nentries > MAPFILEENTRIES || args.gnentries >
GMAPFILEENTRIES) {
vput(lowerrootvp);
free(amp, M_UMAPFSMNT);
/* XXX missing error = EINVAL ? */
return (error);
}
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amp->info_nentries = args.nentries;
amp->info_gnentries = args.gnentries;
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error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
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2*sizeof(u_long)*args.nentries);
if (error) {
free(amp, M_UMAPFSMNT);
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return (error);
}
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#ifdef DEBUG
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printf("umap_mount:nentries %d\n",args.nentries);
for (i = 0; i < args.nentries; i++)
printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
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amp->info_mapdata[i][1]);
#endif
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error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
2*sizeof(u_long)*args.gnentries);
if (error) {
free(amp, M_UMAPFSMNT);
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return (error);
}
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#ifdef DEBUG
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printf("umap_mount:gnentries %d\n",args.gnentries);
for (i = 0; i < args.gnentries; i++)
printf(" group %lu maps to %lu\n",
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amp->info_gmapdata[i][0],
amp->info_gmapdata[i][1]);
#endif
/*
* Save reference. Each mount also holds
* a reference on the root vnode.
*/
error = umap_node_create(mp, lowerrootvp, &vp);
/*
* Unlock the node (either the lower or the alias)
*/
VOP_UNLOCK(vp, 0, td);
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/*
* Make sure the node alias worked
*/
if (error) {
vrele(lowerrootvp);
free(amp, M_UMAPFSMNT); /* XXX */
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return (error);
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in umapfs_unmount.
*/
ASSERT_VOP_LOCKED(vp, "umapfs_mount");
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umapm_rootvp = vp;
umapm_rootvp->v_vflag |= VV_ROOT;
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amp->umapm_rootvp = umapm_rootvp;
if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = (qaddr_t) amp;
vfs_getnewfsid(mp);
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(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void)umapfs_statfs(mp, &mp->mnt_stat, td);
#ifdef DEBUG
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printf("umapfs_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
#endif
return (0);
}
/*
* VFS start. Nothing needed here - the start routine
* on the underlying filesystem will have been called
* when that filesystem was mounted.
*/
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static int
umapfs_start(mp, flags, td)
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struct mount *mp;
int flags;
struct thread *td;
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{
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return (0);
/* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, td)); */
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}
/*
* Free reference to umap layer
*/
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static int
umapfs_unmount(mp, mntflags, td)
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struct mount *mp;
int mntflags;
struct thread *td;
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{
int error;
int flags = 0;
#ifdef DEBUG
printf("umapfs_unmount(mp = %p)\n", (void *)mp);
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#endif
if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
/*
* Clear out buffer cache. I don't think we
* ever get anything cached at this level at the
* moment, but who knows...
*/
#ifdef notyet
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
return (EBUSY);
#endif
/* There is 1 extra root vnode reference (umapm_rootvp). */
error = vflush(mp, 1, flags);
if (error)
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return (error);
/*
* Finally, throw away the umap_mount structure
*/
free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
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mp->mnt_data = 0;
return (0);
}
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static int
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umapfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct thread *td = curthread; /* XXX */
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struct vnode *vp;
#ifdef DEBUG
printf("umapfs_root(mp = %p, vp = %p->%p)\n",
(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
/*
* Return locked reference to root.
*/
vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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*vpp = vp;
return (0);
}
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static int
umapfs_quotactl(mp, cmd, uid, arg, td)
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struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct thread *td;
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{
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return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, td));
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}
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static int
umapfs_statfs(mp, sbp, td)
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struct mount *mp;
struct statfs *sbp;
struct thread *td;
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{
int error;
struct statfs mstat;
#ifdef DEBUG
printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
bzero(&mstat, sizeof(mstat));
error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, td);
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if (error)
return (error);
/* now copy across the "interesting" information and fake the rest */
sbp->f_type = mstat.f_type;
sbp->f_flags = mstat.f_flags;
sbp->f_bsize = mstat.f_bsize;
sbp->f_iosize = mstat.f_iosize;
sbp->f_blocks = mstat.f_blocks;
sbp->f_bfree = mstat.f_bfree;
sbp->f_bavail = mstat.f_bavail;
sbp->f_files = mstat.f_files;
sbp->f_ffree = mstat.f_ffree;
if (sbp != &mp->mnt_stat) {
bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
return (0);
}
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static int
umapfs_vget(mp, ino, flags, vpp)
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struct mount *mp;
ino_t ino;
int flags;
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struct vnode **vpp;
{
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return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, flags, vpp));
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}
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static int
umapfs_fhtovp(mp, fidp, vpp)
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struct mount *mp;
struct fid *fidp;
struct vnode **vpp;
{
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return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
}
static int
umapfs_checkexp(mp, nam, exflagsp, credanonp)
struct mount *mp;
struct sockaddr *nam;
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int *exflagsp;
struct ucred **credanonp;
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{
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return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
exflagsp, credanonp));
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}
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static int
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umapfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
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return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
}
static int
umapfs_extattrctl(mp, cmd, filename_vp, namespace, attrname, td)
struct mount *mp;
int cmd;
o Change the API and ABI of the Extended Attribute kernel interfaces to introduce a new argument, "namespace", rather than relying on a first- character namespace indicator. This is in line with more recent thinking on EA interfaces on various mailing lists, including the posix1e, Linux acl-devel, and trustedbsd-discuss forums. Two namespaces are defined by default, EXTATTR_NAMESPACE_SYSTEM and EXTATTR_NAMESPACE_USER, where the primary distinction lies in the access control model: user EAs are accessible based on the normal MAC and DAC file/directory protections, and system attributes are limited to kernel-originated or appropriately privileged userland requests. o These API changes occur at several levels: the namespace argument is introduced in the extattr_{get,set}_file() system call interfaces, at the vnode operation level in the vop_{get,set}extattr() interfaces, and in the UFS extended attribute implementation. Changes are also introduced in the VFS extattrctl() interface (system call, VFS, and UFS implementation), where the arguments are modified to include a namespace field, as well as modified to advoid direct access to userspace variables from below the VFS layer (in the style of recent changes to mount by adrian@FreeBSD.org). This required some cleanup and bug fixing regarding VFS locks and the VFS interface, as a vnode pointer may now be optionally submitted to the VFS_EXTATTRCTL() call. Updated documentation for the VFS interface will be committed shortly. o In the near future, the auto-starting feature will be updated to search two sub-directories to the ".attribute" directory in appropriate file systems: "user" and "system" to locate attributes intended for those namespaces, as the single filename is no longer sufficient to indicate what namespace the attribute is intended for. Until this is committed, all attributes auto-started by UFS will be placed in the EXTATTR_NAMESPACE_SYSTEM namespace. o The default POSIX.1e attribute names for ACLs and Capabilities have been updated to no longer include the '$' in their filename. As such, if you're using these features, you'll need to rename the attribute backing files to the same names without '$' symbols in front. o Note that these changes will require changes in userland, which will be committed shortly. These include modifications to the extended attribute utilities, as well as to libutil for new namespace string conversion routines. Once the matching userland changes are committed, a buildworld is recommended to update all the necessary include files and verify that the kernel and userland environments are in sync. Note: If you do not use extended attributes (most people won't), upgrading is not imperative although since the system call API has changed, the new userland extended attribute code will no longer compile with old include files. o Couple of minor cleanups while I'm there: make more code compilation conditional on FFS_EXTATTR, which should recover a bit of space on kernels running without EA's, as well as update copyright dates. Obtained from: TrustedBSD Project
2001-03-15 02:54:29 +00:00
struct vnode *filename_vp;
int namespace;
const char *attrname;
struct thread *td;
{
2002-10-19 22:12:19 +00:00
o Change the API and ABI of the Extended Attribute kernel interfaces to introduce a new argument, "namespace", rather than relying on a first- character namespace indicator. This is in line with more recent thinking on EA interfaces on various mailing lists, including the posix1e, Linux acl-devel, and trustedbsd-discuss forums. Two namespaces are defined by default, EXTATTR_NAMESPACE_SYSTEM and EXTATTR_NAMESPACE_USER, where the primary distinction lies in the access control model: user EAs are accessible based on the normal MAC and DAC file/directory protections, and system attributes are limited to kernel-originated or appropriately privileged userland requests. o These API changes occur at several levels: the namespace argument is introduced in the extattr_{get,set}_file() system call interfaces, at the vnode operation level in the vop_{get,set}extattr() interfaces, and in the UFS extended attribute implementation. Changes are also introduced in the VFS extattrctl() interface (system call, VFS, and UFS implementation), where the arguments are modified to include a namespace field, as well as modified to advoid direct access to userspace variables from below the VFS layer (in the style of recent changes to mount by adrian@FreeBSD.org). This required some cleanup and bug fixing regarding VFS locks and the VFS interface, as a vnode pointer may now be optionally submitted to the VFS_EXTATTRCTL() call. Updated documentation for the VFS interface will be committed shortly. o In the near future, the auto-starting feature will be updated to search two sub-directories to the ".attribute" directory in appropriate file systems: "user" and "system" to locate attributes intended for those namespaces, as the single filename is no longer sufficient to indicate what namespace the attribute is intended for. Until this is committed, all attributes auto-started by UFS will be placed in the EXTATTR_NAMESPACE_SYSTEM namespace. o The default POSIX.1e attribute names for ACLs and Capabilities have been updated to no longer include the '$' in their filename. As such, if you're using these features, you'll need to rename the attribute backing files to the same names without '$' symbols in front. o Note that these changes will require changes in userland, which will be committed shortly. These include modifications to the extended attribute utilities, as well as to libutil for new namespace string conversion routines. Once the matching userland changes are committed, a buildworld is recommended to update all the necessary include files and verify that the kernel and userland environments are in sync. Note: If you do not use extended attributes (most people won't), upgrading is not imperative although since the system call API has changed, the new userland extended attribute code will no longer compile with old include files. o Couple of minor cleanups while I'm there: make more code compilation conditional on FFS_EXTATTR, which should recover a bit of space on kernels running without EA's, as well as update copyright dates. Obtained from: TrustedBSD Project
2001-03-15 02:54:29 +00:00
return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd,
filename_vp, namespace, attrname, td));
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}
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static struct vfsops umap_vfsops = {
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umapfs_mount,
umapfs_start,
umapfs_unmount,
umapfs_root,
umapfs_quotactl,
umapfs_statfs,
vfs_stdsync,
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umapfs_vget,
umapfs_fhtovp,
umapfs_checkexp,
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umapfs_vptofh,
umapfs_init,
vfs_stduninit,
umapfs_extattrctl,
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};
VFS_SET(umap_vfsops, umapfs, VFCF_LOOPBACK);