smbfs_vfsops.c revision 132902 
1/*
2 * Copyright (c) 2000-2001, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *    This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/sys/fs/smbfs/smbfs_vfsops.c 132902 2004-07-30 22:08:52Z phk $
33 */
34#include "opt_netsmb.h"
35#ifndef NETSMB
36#error "SMBFS requires option NETSMB"
37#endif
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/proc.h>
42#include <sys/bio.h>
43#include <sys/buf.h>
44#include <sys/kernel.h>
45#include <sys/sysctl.h>
46#include <sys/vnode.h>
47#include <sys/mount.h>
48#include <sys/stat.h>
49#include <sys/malloc.h>
50#include <sys/module.h>
51
52
53#include <netsmb/smb.h>
54#include <netsmb/smb_conn.h>
55#include <netsmb/smb_subr.h>
56#include <netsmb/smb_dev.h>
57
58#include <fs/smbfs/smbfs.h>
59#include <fs/smbfs/smbfs_node.h>
60#include <fs/smbfs/smbfs_subr.h>
61
62int smbfs_debuglevel = 0;
63
64static int smbfs_version = SMBFS_VERSION;
65
66#ifdef SMBFS_USEZONE
67#include <vm/vm.h>
68#include <vm/vm_extern.h>
69
70vm_zone_t smbfsmount_zone;
71#endif
72
73SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS filesystem");
74SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
75SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
76
77static MALLOC_DEFINE(M_SMBFSHASH, "SMBFS hash", "SMBFS hash table");
78
79static vfs_init_t       smbfs_init;
80static vfs_uninit_t     smbfs_uninit;
81static vfs_omount_t     smbfs_omount;
82static vfs_start_t      smbfs_start;
83static vfs_root_t       smbfs_root;
84static vfs_quotactl_t   smbfs_quotactl;
85static vfs_statfs_t     smbfs_statfs;
86static vfs_unmount_t    smbfs_unmount;
87
88static struct vfsops smbfs_vfsops = {
89	.vfs_init =		smbfs_init,
90	.vfs_omount =		smbfs_omount,
91	.vfs_quotactl =		smbfs_quotactl,
92	.vfs_root =		smbfs_root,
93	.vfs_start =		smbfs_start,
94	.vfs_statfs =		smbfs_statfs,
95	.vfs_sync =		vfs_stdsync,
96	.vfs_uninit =		smbfs_uninit,
97	.vfs_unmount =		smbfs_unmount,
98};
99
100
101VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
102
103MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
104MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
105MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
106
107int smbfs_pbuf_freecnt = -1;	/* start out unlimited */
108
109static int
110smbfs_omount(struct mount *mp, char *path, caddr_t data, struct thread *td)
111{
112	struct smbfs_args args; 	  /* will hold data from mount request */
113	struct smbmount *smp = NULL;
114	struct smb_vc *vcp;
115	struct smb_share *ssp = NULL;
116	struct vnode *vp;
117	struct smb_cred scred;
118	int error;
119	char *pc, *pe;
120
121	if (data == NULL) {
122		printf("missing data argument\n");
123		return EINVAL;
124	}
125	if (mp->mnt_flag & MNT_UPDATE) {
126		printf("MNT_UPDATE not implemented");
127		return EOPNOTSUPP;
128	}
129	error = copyin(data, (caddr_t)&args, sizeof(struct smbfs_args));
130	if (error)
131		return error;
132	if (args.version != SMBFS_VERSION) {
133		printf("mount version mismatch: kernel=%d, mount=%d\n",
134		    SMBFS_VERSION, args.version);
135		return EINVAL;
136	}
137	smb_makescred(&scred, td, td->td_ucred);
138	error = smb_dev2share(args.dev, SMBM_EXEC, &scred, &ssp);
139	if (error) {
140		printf("invalid device handle %d (%d)\n", args.dev, error);
141		return error;
142	}
143	vcp = SSTOVC(ssp);
144	smb_share_unlock(ssp, 0, td);
145	mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
146
147#ifdef SMBFS_USEZONE
148	smp = zalloc(smbfsmount_zone);
149#else
150	MALLOC(smp, struct smbmount*, sizeof(*smp), M_SMBFSDATA,
151	    M_WAITOK|M_USE_RESERVE);
152#endif
153        if (smp == NULL) {
154                printf("could not alloc smbmount\n");
155                error = ENOMEM;
156		goto bad;
157        }
158	bzero(smp, sizeof(*smp));
159        mp->mnt_data = (qaddr_t)smp;
160	smp->sm_hash = hashinit(desiredvnodes, M_SMBFSHASH, &smp->sm_hashlen);
161	if (smp->sm_hash == NULL)
162		goto bad;
163	lockinit(&smp->sm_hashlock, PVFS, "smbfsh", 0, 0);
164	smp->sm_share = ssp;
165	smp->sm_root = NULL;
166        smp->sm_args = args;
167	smp->sm_caseopt = args.caseopt;
168	smp->sm_args.file_mode = (smp->sm_args.file_mode &
169			    (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
170	smp->sm_args.dir_mode  = (smp->sm_args.dir_mode &
171			    (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
172
173/*	simple_lock_init(&smp->sm_npslock);*/
174	pc = mp->mnt_stat.f_mntfromname;
175	pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
176	bzero(pc, MNAMELEN);
177	*pc++ = '/';
178	*pc++ = '/';
179	pc=index(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
180	if (pc < pe-1) {
181		*(pc++) = '@';
182		pc = index(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
183		if (pc < pe - 1) {
184			*(pc++) = '/';
185			strncpy(pc, ssp->ss_name, pe - pc - 2);
186		}
187	}
188	/* protect against invalid mount points */
189	smp->sm_args.mount_point[sizeof(smp->sm_args.mount_point) - 1] = '\0';
190	vfs_getnewfsid(mp);
191	error = smbfs_root(mp, &vp, td);
192	if (error)
193		goto bad;
194	VOP_UNLOCK(vp, 0, td);
195	SMBVDEBUG("root.v_usecount = %d\n", vrefcnt(vp));
196
197#ifdef DIAGNOSTICS
198	SMBERROR("mp=%p\n", mp);
199#endif
200	return error;
201bad:
202        if (smp) {
203		if (smp->sm_hash)
204			free(smp->sm_hash, M_SMBFSHASH);
205		lockdestroy(&smp->sm_hashlock);
206#ifdef SMBFS_USEZONE
207		zfree(smbfsmount_zone, smp);
208#else
209		free(smp, M_SMBFSDATA);
210#endif
211	}
212	if (ssp)
213		smb_share_put(ssp, &scred);
214        return error;
215}
216
217/* Unmount the filesystem described by mp. */
218static int
219smbfs_unmount(struct mount *mp, int mntflags, struct thread *td)
220{
221	struct smbmount *smp = VFSTOSMBFS(mp);
222	struct smb_cred scred;
223	int error, flags;
224
225	SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
226	flags = 0;
227	if (mntflags & MNT_FORCE)
228		flags |= FORCECLOSE;
229	/*
230	 * Keep trying to flush the vnode list for the mount while
231	 * some are still busy and we are making progress towards
232	 * making them not busy. This is needed because smbfs vnodes
233	 * reference their parent directory but may appear after their
234	 * parent in the list; one pass over the vnode list is not
235	 * sufficient in this case.
236	 */
237	do {
238		smp->sm_didrele = 0;
239		/* There is 1 extra root vnode reference from smbfs_mount(). */
240		error = vflush(mp, 1, flags, td);
241	} while (error == EBUSY && smp->sm_didrele != 0);
242	if (error)
243		return error;
244	smb_makescred(&scred, td, td->td_ucred);
245	smb_share_put(smp->sm_share, &scred);
246	mp->mnt_data = (qaddr_t)0;
247
248	if (smp->sm_hash)
249		free(smp->sm_hash, M_SMBFSHASH);
250	lockdestroy(&smp->sm_hashlock);
251#ifdef SMBFS_USEZONE
252	zfree(smbfsmount_zone, smp);
253#else
254	free(smp, M_SMBFSDATA);
255#endif
256	mp->mnt_flag &= ~MNT_LOCAL;
257	return error;
258}
259
260/*
261 * Return locked root vnode of a filesystem
262 */
263static int
264smbfs_root(struct mount *mp, struct vnode **vpp, struct thread *td)
265{
266	struct smbmount *smp = VFSTOSMBFS(mp);
267	struct vnode *vp;
268	struct smbnode *np;
269	struct smbfattr fattr;
270	struct ucred *cred = td->td_ucred;
271	struct smb_cred scred;
272	int error;
273
274	if (smp == NULL) {
275		SMBERROR("smp == NULL (bug in umount)\n");
276		return EINVAL;
277	}
278	if (smp->sm_root) {
279		*vpp = SMBTOV(smp->sm_root);
280		return vget(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
281	}
282	smb_makescred(&scred, td, cred);
283	error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
284	if (error)
285		return error;
286	error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
287	if (error)
288		return error;
289	ASSERT_VOP_LOCKED(vp, "smbfs_root");
290	vp->v_vflag |= VV_ROOT;
291	np = VTOSMB(vp);
292	smp->sm_root = np;
293	*vpp = vp;
294	return 0;
295}
296
297/*
298 * Vfs start routine, a no-op.
299 */
300/* ARGSUSED */
301static int
302smbfs_start(mp, flags, td)
303	struct mount *mp;
304	int flags;
305	struct thread *td;
306{
307	SMBVDEBUG("flags=%04x\n", flags);
308	return 0;
309}
310
311/*
312 * Do operations associated with quotas, not supported
313 */
314/* ARGSUSED */
315static int
316smbfs_quotactl(mp, cmd, uid, arg, td)
317	struct mount *mp;
318	int cmd;
319	uid_t uid;
320	caddr_t arg;
321	struct thread *td;
322{
323	SMBVDEBUG("return EOPNOTSUPP\n");
324	return EOPNOTSUPP;
325}
326
327/*ARGSUSED*/
328int
329smbfs_init(struct vfsconf *vfsp)
330{
331#ifdef SMBFS_USEZONE
332	smbfsmount_zone = zinit("SMBFSMOUNT", sizeof(struct smbmount), 0, 0, 1);
333#endif
334	smbfs_pbuf_freecnt = nswbuf / 2 + 1;
335	SMBVDEBUG("done.\n");
336	return 0;
337}
338
339/*ARGSUSED*/
340int
341smbfs_uninit(struct vfsconf *vfsp)
342{
343
344	SMBVDEBUG("done.\n");
345	return 0;
346}
347
348/*
349 * smbfs_statfs call
350 */
351int
352smbfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
353{
354	struct smbmount *smp = VFSTOSMBFS(mp);
355	struct smbnode *np = smp->sm_root;
356	struct smb_share *ssp = smp->sm_share;
357	struct smb_cred scred;
358	int error = 0;
359
360	if (np == NULL)
361		return EINVAL;
362
363	sbp->f_iosize = SSTOVC(ssp)->vc_txmax;		/* optimal transfer block size */
364	smb_makescred(&scred, td, td->td_ucred);
365
366	if (SMB_DIALECT(SSTOVC(ssp)) >= SMB_DIALECT_LANMAN2_0)
367		error = smbfs_smb_statfs2(ssp, sbp, &scred);
368	else
369		error = smbfs_smb_statfs(ssp, sbp, &scred);
370	if (error)
371		return error;
372	sbp->f_flags = 0;		/* copy of mount exported flags */
373	if (sbp != &mp->mnt_stat) {
374		sbp->f_fsid = mp->mnt_stat.f_fsid;	/* filesystem id */
375		sbp->f_owner = mp->mnt_stat.f_owner;	/* user that mounted the filesystem */
376		sbp->f_type = mp->mnt_vfc->vfc_typenum;	/* type of filesystem */
377		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
378		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
379	}
380	strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
381	return 0;
382}
383