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NetBSD/sys/fs/smbfs/smbfs_vfsops.c

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/* $NetBSD: smbfs_vfsops.c,v 1.96 2013/10/17 21:04:44 christos Exp $ */
/*
* Copyright (c) 2000-2001, Boris Popov
* All rights reserved.
*
* 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 Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* FreeBSD: src/sys/fs/smbfs/smbfs_vfsops.c,v 1.5 2001/12/13 13:08:34 sheldonh Exp
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: smbfs_vfsops.c,v 1.96 2013/10/17 21:04:44 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/dirent.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <miscfs/genfs/genfs.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_dev.h>
#include <fs/smbfs/smbfs.h>
#include <fs/smbfs/smbfs_node.h>
#include <fs/smbfs/smbfs_subr.h>
MODULE(MODULE_CLASS_VFS, smbfs, NULL);
VFS_PROTOS(smbfs);
static struct sysctllog *smbfs_sysctl_log;
static int smbfs_setroot(struct mount *);
extern struct vnodeopv_desc smbfs_vnodeop_opv_desc;
static const struct vnodeopv_desc *smbfs_vnodeopv_descs[] = {
&smbfs_vnodeop_opv_desc,
NULL,
};
struct vfsops smbfs_vfsops = {
MOUNT_SMBFS,
sizeof (struct smbfs_args),
smbfs_mount,
smbfs_start,
smbfs_unmount,
smbfs_root,
(void *)eopnotsupp, /* vfs_quotactl */
smbfs_statvfs,
smbfs_sync,
smbfs_vget,
(void *)eopnotsupp, /* vfs_fhtovp */
(void *)eopnotsupp, /* vfs_vptofh */
smbfs_init,
smbfs_reinit,
smbfs_done,
(int (*) (void)) eopnotsupp, /* mountroot */
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
(void *)eopnotsupp, /* vfs_suspendctl */
genfs_renamelock_enter,
genfs_renamelock_exit,
(void *)eopnotsupp,
smbfs_vnodeopv_descs,
0, /* vfs_refcount */
{ NULL, NULL },
};
static int
smbfs_modcmd(modcmd_t cmd, void *arg)
{
const struct sysctlnode *smb = NULL;
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&smbfs_vfsops);
if (error != 0)
break;
sysctl_createv(&smbfs_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(&smbfs_sysctl_log, 0, NULL, &smb,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "samba",
SYSCTL_DESCR("SMB/CIFS remote file system"),
NULL, 0, NULL, 0,
CTL_VFS, CTL_CREATE, CTL_EOL);
if (smb != NULL) {
sysctl_createv(&smbfs_sysctl_log, 0, &smb, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "version",
SYSCTL_DESCR("smbfs version"),
NULL, SMBFS_VERSION, NULL, 0,
CTL_CREATE, CTL_EOL);
}
break;
case MODULE_CMD_FINI:
error = vfs_detach(&smbfs_vfsops);
if (error != 0)
break;
sysctl_teardown(&smbfs_sysctl_log);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
int
smbfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct smbfs_args *args = data; /* holds data from mount request */
struct smbmount *smp = NULL;
struct smb_vc *vcp;
struct smb_share *ssp = NULL;
struct smb_cred scred;
char *fromname;
int error;
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
smp = VFSTOSMBFS(mp);
if (smp == NULL)
return EIO;
*args = smp->sm_args;
*data_len = sizeof *args;
return 0;
}
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
if (args->version != SMBFS_VERSION) {
SMBVDEBUG("mount version mismatch: kernel=%d, mount=%d\n",
SMBFS_VERSION, args->version);
return EINVAL;
}
smb_makescred(&scred, l, l->l_cred);
error = smb_dev2share(args->dev_fd, SMBM_EXEC, &scred, &ssp);
if (error)
return error;
smb_share_unlock(ssp); /* keep ref, but unlock */
vcp = SSTOVC(ssp);
fromname = kmem_zalloc(MNAMELEN, KM_SLEEP);
snprintf(fromname, MNAMELEN,
"//%s@%s/%s", vcp->vc_username, vcp->vc_srvname, ssp->ss_name);
error = set_statvfs_info(path, UIO_USERSPACE, fromname, UIO_SYSSPACE,
mp->mnt_op->vfs_name, mp, l);
kmem_free(fromname, MNAMELEN);
if (error) {
smb_share_lock(ssp);
smb_share_put(ssp, &scred);
return error;
}
mp->mnt_stat.f_iosize = vcp->vc_txmax;
mp->mnt_stat.f_namemax =
(vcp->vc_hflags2 & SMB_FLAGS2_KNOWS_LONG_NAMES) ? 255 : 12;
smp = malloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK|M_ZERO);
mp->mnt_data = smp;
smp->sm_hash = hashinit(desiredvnodes, HASH_LIST, true,
&smp->sm_hashlen);
mutex_init(&smp->sm_hashlock, MUTEX_DEFAULT, IPL_NONE);
smp->sm_share = ssp;
smp->sm_root = NULL;
smp->sm_args = *args;
smp->sm_caseopt = args->caseopt;
smp->sm_args.file_mode = (smp->sm_args.file_mode &
(S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
smp->sm_args.dir_mode = (smp->sm_args.dir_mode &
(S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
vfs_getnewfsid(mp);
return (0);
}
/* Unmount the filesystem described by mp. */
int
smbfs_unmount(struct mount *mp, int mntflags)
{
struct lwp *l = curlwp;
struct smbmount *smp = VFSTOSMBFS(mp);
struct smb_cred scred;
struct vnode *smbfs_rootvp = SMBTOV(smp->sm_root);
int error, flags;
SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if (smbfs_rootvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
return EBUSY;
/* Flush all vnodes.
* Keep trying to flush the vnode list for the mount while
* some are still busy and we are making progress towards
* making them not busy. This is needed because smbfs vnodes
* reference their parent directory but may appear after their
* parent in the list; one pass over the vnode list is not
* sufficient in this case. */
do {
smp->sm_didrele = 0;
error = vflush(mp, smbfs_rootvp, flags);
} while (error == EBUSY && smp->sm_didrele != 0);
if (error)
return error;
vgone(smbfs_rootvp);
smb_makescred(&scred, l, l->l_cred);
smb_share_lock(smp->sm_share);
smb_share_put(smp->sm_share, &scred);
mp->mnt_data = NULL;
hashdone(smp->sm_hash, HASH_LIST, smp->sm_hashlen);
mutex_destroy(&smp->sm_hashlock);
free(smp, M_SMBFSDATA);
return 0;
}
/*
* Get root vnode of the smbfs filesystem, and store it in sm_root.
*/
static int
smbfs_setroot(struct mount *mp)
{
struct smbmount *smp = VFSTOSMBFS(mp);
struct vnode *vp;
struct smbfattr fattr;
struct lwp *l = curlwp;
kauth_cred_t cred = l->l_cred;
struct smb_cred scred;
int error;
KASSERT(smp->sm_root == NULL);
smb_makescred(&scred, l, cred);
error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
if (error)
return error;
error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
if (error)
return error;
/*
* Someone might have already set sm_root while we slept
* in smb_lookup or vnode allocation.
*/
if (smp->sm_root)
vput(vp);
else {
vp->v_vflag |= VV_ROOT;
smp->sm_root = VTOSMB(vp);
/* Keep reference, but unlock */
VOP_UNLOCK(vp);
}
return (0);
}
/*
* Return locked root vnode of a filesystem.
*/
int
smbfs_root(struct mount *mp, struct vnode **vpp)
{
struct smbmount *smp = VFSTOSMBFS(mp);
int error;
if (__predict_false(!smp->sm_root)) {
error = smbfs_setroot(mp);
if (error)
return (error);
/* fallthrough */
}
KASSERT(smp->sm_root != NULL && SMBTOV(smp->sm_root) != NULL);
*vpp = SMBTOV(smp->sm_root);
vref(*vpp);
error = vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
if (error)
vrele(*vpp);
return error;
}
/*
* Make a filesystem operational.
* Nothing to do at the moment.
*/
/* ARGSUSED */
int
smbfs_start(struct mount *mp, int flags)
{
SMBVDEBUG("flags=%04x\n", flags);
return 0;
}
void
smbfs_init(void)
{
malloc_type_attach(M_SMBNODENAME);
malloc_type_attach(M_SMBFSDATA);
pool_init(&smbfs_node_pool, sizeof(struct smbnode), 0, 0, 0,
"smbfsnopl", &pool_allocator_nointr, IPL_NONE);
SMBVDEBUG0("init.\n");
}
void
smbfs_reinit(void)
{
SMBVDEBUG0("reinit.\n");
}
void
smbfs_done(void)
{
pool_destroy(&smbfs_node_pool);
malloc_type_detach(M_SMBNODENAME);
malloc_type_detach(M_SMBFSDATA);
SMBVDEBUG0("done.\n");
}
/*
* smbfs_statvfs call
*/
int
smbfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct lwp *l = curlwp;
struct smbmount *smp = VFSTOSMBFS(mp);
struct smb_share *ssp = smp->sm_share;
struct smb_cred scred;
int error = 0;
sbp->f_iosize = SSTOVC(ssp)->vc_txmax; /* optimal transfer block size */
smb_makescred(&scred, l, l->l_cred);
error = smbfs_smb_statvfs(ssp, sbp, &scred);
if (error)
return error;
sbp->f_flag = 0; /* copy of mount exported flags */
sbp->f_owner = mp->mnt_stat.f_owner; /* user that mounted the filesystem */
copy_statvfs_info(sbp, mp);
return 0;
}
/*
* Flush out the buffer cache
*/
int
smbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp, *mvp;
struct smbnode *np;
int error, allerror = 0;
/* Allocate a marker vnode. */
mvp = vnalloc(mp);
/*
* Force stale buffer cache information to be flushed.
*/
mutex_enter(&mntvnode_lock);
loop:
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
/*
* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (vp->v_mount != mp || vismarker(vp))
continue;
mutex_enter(vp->v_interlock);
np = VTOSMB(vp);
if (np == NULL) {
mutex_exit(vp->v_interlock);
continue;
}
if ((vp->v_type == VNON || (np->n_flag & NMODIFIED) == 0) &&
LIST_EMPTY(&vp->v_dirtyblkhd) &&
vp->v_uobj.uo_npages == 0) {
mutex_exit(vp->v_interlock);
continue;
}
mutex_exit(&mntvnode_lock);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
if (error) {
mutex_enter(&mntvnode_lock);
if (error == ENOENT) {
(void)vunmark(mvp);
goto loop;
}
continue;
}
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
return (allerror);
}
#if __FreeBSD_version < 400009
/*
* smbfs flat namespace lookup. Unsupported.
*/
/* ARGSUSED */
int smbfs_vget(struct mount *mp, ino_t ino,
struct vnode **vpp)
{
return (EOPNOTSUPP);
}
#endif /* __FreeBSD_version < 400009 */
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