kernel - Do a better job with the filesystem background sync
[dragonfly.git] / sys / vfs / smbfs / smbfs_vfsops.c
CommitLineData
984263bc
MD
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: src/sys/fs/smbfs/smbfs_vfsops.c,v 1.2.2.5 2003/01/17 08:20:26 tjr Exp $
3c37c940 33 * $DragonFly: src/sys/vfs/smbfs/smbfs_vfsops.c,v 1.33 2007/05/06 19:23:35 dillon Exp $
984263bc
MD
34 */
35#include "opt_netsmb.h"
36#ifndef NETSMB
37#error "SMBFS requires option NETSMB"
38#endif
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/proc.h>
43#include <sys/kernel.h>
44#include <sys/sysctl.h>
45#include <sys/vnode.h>
46#include <sys/mount.h>
47#include <sys/stat.h>
48#include <sys/malloc.h>
49#include <sys/module.h>
50
51
d2438d69
MD
52#include <netproto/smb/smb.h>
53#include <netproto/smb/smb_conn.h>
54#include <netproto/smb/smb_subr.h>
55#include <netproto/smb/smb_dev.h>
984263bc 56
1f2de5d4
MD
57#include "smbfs.h"
58#include "smbfs_node.h"
59#include "smbfs_subr.h"
984263bc
MD
60
61#include <sys/buf.h>
62
66a1ddf5 63extern struct vop_ops smbfs_vnode_vops;
0961aa92 64
984263bc
MD
65int smbfs_debuglevel = 0;
66
67static int smbfs_version = SMBFS_VERSION;
68
69#ifdef SMBFS_USEZONE
70#include <vm/vm.h>
71#include <vm/vm_extern.h>
72#include <vm/vm_zone.h>
73
74vm_zone_t smbfsmount_zone;
75#endif
76
77SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS file system");
78SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
79SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
80
81static MALLOC_DEFINE(M_SMBFSHASH, "SMBFS hash", "SMBFS hash table");
82
83
acde96db 84static int smbfs_mount(struct mount *, char *, caddr_t, struct ucred *);
984263bc 85static int smbfs_root(struct mount *, struct vnode **);
acde96db 86static int smbfs_statfs(struct mount *, struct statfs *, struct ucred *);
87de5057 87static int smbfs_sync(struct mount *, int);
acde96db 88static int smbfs_unmount(struct mount *, int);
984263bc
MD
89static int smbfs_init(struct vfsconf *vfsp);
90static int smbfs_uninit(struct vfsconf *vfsp);
91
84c73a71 92#if defined(__FreeBSD__) && __FreeBSD_version < 400009
984263bc
MD
93static int smbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp);
94static int smbfs_fhtovp(struct mount *, struct fid *,
95 struct sockaddr *, struct vnode **, int *,
96 struct ucred **);
97static int smbfs_vptofh(struct vnode *, struct fid *);
98#endif
99
100static struct vfsops smbfs_vfsops = {
43c45e8f
HP
101 .vfs_mount = smbfs_mount,
102 .vfs_unmount = smbfs_unmount,
103 .vfs_root = smbfs_root,
104 .vfs_statfs = smbfs_statfs,
105 .vfs_sync = smbfs_sync,
106 .vfs_init = smbfs_init,
107 .vfs_uninit = smbfs_uninit
984263bc
MD
108};
109
110
111VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
112
113MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
6288c7ec 114MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
984263bc
MD
115MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
116
117int smbfs_pbuf_freecnt = -1; /* start out unlimited */
118
119static int
acde96db 120smbfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
984263bc
MD
121{
122 struct smbfs_args args; /* will hold data from mount request */
123 struct smbmount *smp = NULL;
124 struct smb_vc *vcp;
125 struct smb_share *ssp = NULL;
126 struct vnode *vp;
127 struct smb_cred scred;
984263bc
MD
128 int error;
129 char *pc, *pe;
130
131 if (data == NULL) {
086c1d7e 132 kprintf("missing data argument\n");
984263bc
MD
133 return EINVAL;
134 }
135 if (mp->mnt_flag & MNT_UPDATE) {
086c1d7e 136 kprintf("MNT_UPDATE not implemented");
984263bc
MD
137 return EOPNOTSUPP;
138 }
139 error = copyin(data, (caddr_t)&args, sizeof(struct smbfs_args));
140 if (error)
141 return error;
142 if (args.version != SMBFS_VERSION) {
086c1d7e 143 kprintf("mount version mismatch: kernel=%d, mount=%d\n",
984263bc
MD
144 SMBFS_VERSION, args.version);
145 return EINVAL;
146 }
acde96db 147 smb_makescred(&scred, curthread, cred);
984263bc
MD
148 error = smb_dev2share(args.dev, SMBM_EXEC, &scred, &ssp);
149 if (error) {
086c1d7e 150 kprintf("invalid device handle %d (%d)\n", args.dev, error);
984263bc
MD
151 return error;
152 }
153 vcp = SSTOVC(ssp);
fef8985e 154 smb_share_unlock(ssp, 0);
984263bc
MD
155 mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
156
157#ifdef SMBFS_USEZONE
158 smp = zalloc(smbfsmount_zone);
159#else
dc1fd4b3 160 MALLOC(smp, struct smbmount*, sizeof(*smp), M_SMBFSDATA, M_WAITOK|M_USE_RESERVE);
984263bc
MD
161#endif
162 if (smp == NULL) {
086c1d7e 163 kprintf("could not alloc smbmount\n");
984263bc
MD
164 error = ENOMEM;
165 goto bad;
166 }
167 bzero(smp, sizeof(*smp));
168 mp->mnt_data = (qaddr_t)smp;
acde96db 169 smp->sm_cred = crhold(cred);
984263bc
MD
170 smp->sm_hash = hashinit(desiredvnodes, M_SMBFSHASH, &smp->sm_hashlen);
171 if (smp->sm_hash == NULL)
172 goto bad;
f2770c70 173 lockinit(&smp->sm_hashlock, "smbfsh", 0, 0);
984263bc
MD
174 smp->sm_share = ssp;
175 smp->sm_root = NULL;
176 smp->sm_args = args;
177 smp->sm_caseopt = args.caseopt;
178 smp->sm_args.file_mode = (smp->sm_args.file_mode &
179 (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
180 smp->sm_args.dir_mode = (smp->sm_args.dir_mode &
181 (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
182
183/* simple_lock_init(&smp->sm_npslock);*/
984263bc
MD
184 pc = mp->mnt_stat.f_mntfromname;
185 pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
186 bzero(pc, MNAMELEN);
187 *pc++ = '/';
188 *pc++ = '/';
189 pc=index(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
190 if (pc < pe-1) {
191 *(pc++) = '@';
192 pc = index(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
193 if (pc < pe - 1) {
194 *(pc++) = '/';
195 strncpy(pc, ssp->ss_name, pe - pc - 2);
196 }
197 }
198 /* protect against invalid mount points */
199 smp->sm_args.mount_point[sizeof(smp->sm_args.mount_point) - 1] = '\0';
200 vfs_getnewfsid(mp);
0961aa92 201
66a1ddf5 202 vfs_add_vnodeops(mp, &smbfs_vnode_vops, &mp->mnt_vn_norm_ops);
0961aa92 203
984263bc
MD
204 error = smbfs_root(mp, &vp);
205 if (error)
206 goto bad;
a11aaa81 207 vn_unlock(vp);
3c37c940 208 SMBVDEBUG("root.v_sysrefs = %d\n", vp->v_sysref.refcnt);
984263bc
MD
209
210#ifdef DIAGNOSTICS
211 SMBERROR("mp=%p\n", mp);
212#endif
213 return error;
214bad:
215 if (smp) {
acde96db
MD
216 if (smp->sm_cred)
217 crfree(smp->sm_cred);
984263bc 218 if (smp->sm_hash)
efda3bd0 219 kfree(smp->sm_hash, M_SMBFSHASH);
984263bc
MD
220 lockdestroy(&smp->sm_hashlock);
221#ifdef SMBFS_USEZONE
222 zfree(smbfsmount_zone, smp);
223#else
efda3bd0 224 kfree(smp, M_SMBFSDATA);
984263bc
MD
225#endif
226 }
227 if (ssp)
228 smb_share_put(ssp, &scred);
229 return error;
230}
231
232/* Unmount the filesystem described by mp. */
233static int
acde96db 234smbfs_unmount(struct mount *mp, int mntflags)
984263bc
MD
235{
236 struct smbmount *smp = VFSTOSMBFS(mp);
237 struct smb_cred scred;
238 int error, flags;
239
240 SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
241 flags = 0;
242 if (mntflags & MNT_FORCE)
243 flags |= FORCECLOSE;
244 /*
245 * Keep trying to flush the vnode list for the mount while
246 * some are still busy and we are making progress towards
247 * making them not busy. This is needed because smbfs vnodes
248 * reference their parent directory but may appear after their
249 * parent in the list; one pass over the vnode list is not
250 * sufficient in this case.
251 */
252 do {
253 smp->sm_didrele = 0;
254 /* There is 1 extra root vnode reference from smbfs_mount(). */
255 error = vflush(mp, 1, flags);
256 } while (error == EBUSY && smp->sm_didrele != 0);
257 if (error)
258 return error;
acde96db 259 smb_makescred(&scred, curthread, smp->sm_cred);
984263bc
MD
260 smb_share_put(smp->sm_share, &scred);
261 mp->mnt_data = (qaddr_t)0;
262
acde96db
MD
263 if (smp->sm_cred)
264 crfree(smp->sm_cred);
984263bc 265 if (smp->sm_hash)
efda3bd0 266 kfree(smp->sm_hash, M_SMBFSHASH);
984263bc
MD
267 lockdestroy(&smp->sm_hashlock);
268#ifdef SMBFS_USEZONE
269 zfree(smbfsmount_zone, smp);
270#else
efda3bd0 271 kfree(smp, M_SMBFSDATA);
984263bc
MD
272#endif
273 mp->mnt_flag &= ~MNT_LOCAL;
274 return error;
275}
276
277/*
278 * Return locked root vnode of a filesystem
279 */
280static int
281smbfs_root(struct mount *mp, struct vnode **vpp)
282{
dadab5e9 283 struct thread *td = curthread; /* XXX */
984263bc
MD
284 struct smbmount *smp = VFSTOSMBFS(mp);
285 struct vnode *vp;
286 struct smbnode *np;
287 struct smbfattr fattr;
dadab5e9 288 struct ucred *cred;
984263bc
MD
289 struct smb_cred scred;
290 int error;
291
292 if (smp == NULL) {
293 SMBERROR("smp == NULL (bug in umount)\n");
294 return EINVAL;
295 }
296 if (smp->sm_root) {
297 *vpp = SMBTOV(smp->sm_root);
87de5057 298 return vget(*vpp, LK_EXCLUSIVE | LK_RETRY);
984263bc 299 }
61670a01
MD
300 if (td->td_proc)
301 cred = td->td_proc->p_ucred;
302 else
303 cred = proc0.p_ucred;
304
dadab5e9 305 smb_makescred(&scred, td, cred);
984263bc
MD
306 error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
307 if (error)
308 return error;
309 error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
310 if (error)
311 return error;
2247fe02 312 vsetflags(vp, VROOT);
984263bc
MD
313 np = VTOSMB(vp);
314 smp->sm_root = np;
315 *vpp = vp;
316 return 0;
317}
318
984263bc
MD
319/*ARGSUSED*/
320int
321smbfs_init(struct vfsconf *vfsp)
322{
984263bc
MD
323#ifdef SMBFS_USEZONE
324 smbfsmount_zone = zinit("SMBFSMOUNT", sizeof(struct smbmount), 0, 0, 1);
325#endif
326 smbfs_pbuf_freecnt = nswbuf / 2 + 1;
327 SMBVDEBUG("done.\n");
328 return 0;
329}
330
331/*ARGSUSED*/
332int
333smbfs_uninit(struct vfsconf *vfsp)
334{
984263bc
MD
335 SMBVDEBUG("done.\n");
336 return 0;
337}
338
339/*
340 * smbfs_statfs call
341 */
342int
acde96db 343smbfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
984263bc
MD
344{
345 struct smbmount *smp = VFSTOSMBFS(mp);
346 struct smbnode *np = smp->sm_root;
347 struct smb_share *ssp = smp->sm_share;
348 struct smb_cred scred;
349 int error = 0;
350
351 if (np == NULL)
352 return EINVAL;
353
354 sbp->f_iosize = SSTOVC(ssp)->vc_txmax; /* optimal transfer block size */
355 sbp->f_spare2 = 0; /* placeholder */
acde96db 356 smb_makescred(&scred, curthread, cred);
984263bc
MD
357
358 if (SMB_DIALECT(SSTOVC(ssp)) >= SMB_DIALECT_LANMAN2_0)
359 error = smbfs_smb_statfs2(ssp, sbp, &scred);
360 else
361 error = smbfs_smb_statfs(ssp, sbp, &scred);
362 if (error)
363 return error;
364 sbp->f_flags = 0; /* copy of mount exported flags */
365 if (sbp != &mp->mnt_stat) {
366 sbp->f_fsid = mp->mnt_stat.f_fsid; /* file system id */
367 sbp->f_owner = mp->mnt_stat.f_owner; /* user that mounted the filesystem */
368 sbp->f_type = mp->mnt_vfc->vfc_typenum; /* type of filesystem */
984263bc
MD
369 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
370 }
371 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
372 return 0;
373}
374
375/*
376 * Flush out the buffer cache
377 */
378/* ARGSUSED */
379static int
87de5057 380smbfs_sync(struct mount *mp, int waitfor)
984263bc
MD
381{
382 struct vnode *vp;
383 int error, allerror = 0;
384 /*
385 * Force stale buffer cache information to be flushed.
386 */
387loop:
388 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
389 vp != NULL;
390 vp = TAILQ_NEXT(vp, v_nmntvnodes)) {
391 /*
392 * If the vnode that we are about to sync is no longer
393 * associated with this mount point, start over.
394 */
395 if (vp->v_mount != mp)
396 goto loop;
a11aaa81 397 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree) ||
28271622 398 (waitfor & MNT_LAZY))
984263bc 399 continue;
87de5057 400 if (vget(vp, LK_EXCLUSIVE))
984263bc 401 goto loop;
52174f71 402 error = VOP_FSYNC(vp, waitfor, 0);
984263bc
MD
403 if (error)
404 allerror = error;
405 vput(vp);
406 }
407 return (allerror);
408}
409
84c73a71 410#if defined(__FreeBSD__) && __FreeBSD_version < 400009
984263bc
MD
411/*
412 * smbfs flat namespace lookup. Unsupported.
413 */
414/* ARGSUSED */
9c2a2cee 415static int smbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
984263bc
MD
416{
417 return (EOPNOTSUPP);
418}
419
420/* ARGSUSED */
9c2a2cee
CP
421static int smbfs_fhtovp(struct mount *mp, struct fid *fhp,
422 struct sockaddr *nam, struct vnode **vpp,
423 int *exflagsp, struct ucred **credanonp)
984263bc
MD
424{
425 return (EINVAL);
426}
427
428/*
429 * Vnode pointer to File handle, should never happen either
430 */
431/* ARGSUSED */
432static int
9c2a2cee 433smbfs_vptofh(struct vnode *vp, struct fid *fhp)
984263bc
MD
434{
435 return (EINVAL);
436}
437
438#endif /* __FreeBSD_version < 400009 */