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_node.c,v 1.2.2.3 2003/01/17 08:20:26 tjr Exp $
33 */
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/time.h>
38 #include <sys/proc.h>
39 #include <sys/mount.h>
40 #include <sys/vnode.h>
41 #include <sys/malloc.h>
42 #include <sys/sysctl.h>
43 #include <vm/vm.h>
44 #include <vm/vm_extern.h>
45 /*#include <vm/vm_page.h>
46 #include <vm/vm_object.h>*/
47 #include <sys/queue.h>
48
49 #include <netproto/smb/smb.h>
50 #include <netproto/smb/smb_conn.h>
51 #include <netproto/smb/smb_subr.h>
52
53 #include "smbfs.h"
54 #include "smbfs_node.h"
55 #include "smbfs_subr.h"
56
57 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
58 #define smbfs_hash_lock(smp, td) lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE)
59 #define smbfs_hash_unlock(smp, td) lockmgr(&smp->sm_hashlock, LK_RELEASE)
60
61
62 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part");
63 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
64
65 int smbfs_hashprint(struct mount *mp);
66
67 #if 0
68 #ifdef SYSCTL_DECL
69 SYSCTL_DECL(_vfs_smbfs);
70 #endif
71 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
72 NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash");
73 #endif
74
75 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL)
76 #define FNV1_32_INIT ((u_int32_t) 33554467UL)
77
78 u_int32_t
smbfs_hash(const u_char * name,int nmlen)79 smbfs_hash(const u_char *name, int nmlen)
80 {
81 u_int32_t v;
82
83 for (v = FNV1_32_INIT; nmlen; name++, nmlen--) {
84 v *= FNV_32_PRIME;
85 v ^= (u_int32_t)*name;
86 }
87 return v;
88 }
89
90 int
smbfs_hashprint(struct mount * mp)91 smbfs_hashprint(struct mount *mp)
92 {
93 struct smbmount *smp = VFSTOSMBFS(mp);
94 struct smbnode_hashhead *nhpp;
95 struct smbnode *np;
96 int i;
97
98 for(i = 0; i <= smp->sm_hashlen; i++) {
99 nhpp = &smp->sm_hash[i];
100 LIST_FOREACH(np, nhpp, n_hash)
101 vprint(NULL, SMBTOV(np));
102 }
103 return 0;
104 }
105
106 static char *
smbfs_name_alloc(const u_char * name,int nmlen)107 smbfs_name_alloc(const u_char *name, int nmlen)
108 {
109 u_char *cp;
110
111 nmlen++;
112 #ifdef SMBFS_NAME_DEBUG
113 cp = kmalloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK);
114 *(int*)cp = nmlen;
115 cp += sizeof(int);
116 cp[0] = 0xfc;
117 cp++;
118 bcopy(name, cp, nmlen - 1);
119 cp[nmlen] = 0xfe;
120 #else
121 cp = kmalloc(nmlen, M_SMBNODENAME, M_WAITOK);
122 bcopy(name, cp, nmlen - 1);
123 #endif
124 cp[nmlen - 1] = 0;
125 return cp;
126 }
127
128 static void
smbfs_name_free(u_char * name)129 smbfs_name_free(u_char *name)
130 {
131 #ifdef SMBFS_NAME_DEBUG
132 int nmlen, slen;
133 u_char *cp;
134
135 cp = name;
136 cp--;
137 if (*cp != 0xfc) {
138 kprintf("First byte of name entry '%s' corrupted\n", name);
139 Debugger("ditto");
140 }
141 cp -= sizeof(int);
142 nmlen = *(int*)cp;
143 slen = strlen(name) + 1;
144 if (nmlen != slen) {
145 kprintf("Name length mismatch: was %d, now %d name '%s'\n",
146 nmlen, slen, name);
147 Debugger("ditto");
148 }
149 if (name[nmlen] != 0xfe) {
150 kprintf("Last byte of name entry '%s' corrupted\n", name);
151 Debugger("ditto");
152 }
153 kfree(cp, M_SMBNODENAME);
154 #else
155 kfree(name, M_SMBNODENAME);
156 #endif
157 }
158
159 static int
smbfs_node_alloc(struct mount * mp,struct vnode * dvp,const char * name,int nmlen,struct smbfattr * fap,struct vnode ** vpp)160 smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
161 const char *name, int nmlen, struct smbfattr *fap,
162 struct vnode **vpp)
163 {
164 struct smbmount *smp = VFSTOSMBFS(mp);
165 struct smbnode_hashhead *nhpp;
166 struct smbnode *np, *np2, *dnp;
167 struct vnode *vp;
168 u_long hashval;
169 int error;
170
171 *vpp = NULL;
172 if (smp->sm_root != NULL && dvp == NULL) {
173 SMBERROR("do not allocate root vnode twice!\n");
174 return EINVAL;
175 }
176 if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
177 if (dvp == NULL)
178 return EINVAL;
179 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
180 error = vget(vp, LK_EXCLUSIVE);
181 if (error == 0)
182 *vpp = vp;
183 return error;
184 } else if (nmlen == 1 && name[0] == '.') {
185 SMBERROR("do not call me with dot!\n");
186 return EINVAL;
187 }
188 dnp = dvp ? VTOSMB(dvp) : NULL;
189 if (dnp == NULL && dvp != NULL) {
190 vprint("smbfs_node_alloc: dead parent vnode", dvp);
191 return EINVAL;
192 }
193 hashval = smbfs_hash(name, nmlen);
194 retry:
195 smbfs_hash_lock(smp, td);
196 loop:
197 nhpp = SMBFS_NOHASH(smp, hashval);
198 LIST_FOREACH(np, nhpp, n_hash) {
199 if (np->n_parent != dvp ||
200 np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
201 continue;
202 vp = SMBTOV(np);
203 smbfs_hash_unlock(smp, td);
204 if (vget(vp, LK_EXCLUSIVE) != 0)
205 goto retry;
206 /*
207 * relookup after we blocked.
208 */
209 LIST_FOREACH(np2, nhpp, n_hash) {
210 if (np2->n_parent == dvp && np2->n_nmlen == nmlen &&
211 bcmp(name, np2->n_name, nmlen) == 0)
212 break;
213 }
214 if (np2 != np || SMBTOV(np2) != vp) {
215 vput(vp);
216 goto retry;
217 }
218 *vpp = vp;
219 return 0;
220 }
221 smbfs_hash_unlock(smp, td);
222 /*
223 * If we don't have node attributes, then it is an explicit lookup
224 * for an existing vnode.
225 */
226 if (fap == NULL)
227 return ENOENT;
228
229 np = kmalloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO);
230 error = getnewvnode(VT_SMBFS, mp, &vp, VLKTIMEOUT, LK_CANRECURSE);
231 if (error) {
232 kfree(np, M_SMBNODE);
233 return error;
234 }
235 vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
236 vp->v_data = np;
237 np->n_vnode = vp;
238 np->n_mount = VFSTOSMBFS(mp);
239 np->n_nmlen = nmlen;
240 np->n_name = smbfs_name_alloc(name, nmlen);
241 np->n_ino = fap->fa_ino;
242
243 if (dvp) {
244 np->n_parent = dvp;
245 if (/*vp->v_type == VDIR &&*/ (dvp->v_flag & VROOT) == 0) {
246 vref(dvp);
247 np->n_flag |= NREFPARENT;
248 }
249 } else if (vp->v_type == VREG)
250 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
251
252 smbfs_hash_lock(smp, td);
253 LIST_FOREACH(np2, nhpp, n_hash) {
254 if (np2->n_parent != dvp ||
255 np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0)
256 continue;
257 vx_put(vp);
258 /* smb_name_free(np->n_name);
259 FREE(np, M_SMBNODE);*/
260 goto loop;
261 }
262 LIST_INSERT_HEAD(nhpp, np, n_hash);
263 smbfs_hash_unlock(smp, td);
264 /*
265 * Return a locked and refd vnode
266 */
267 vx_downgrade(vp);
268 *vpp = vp;
269 return 0;
270 }
271
272 int
smbfs_nget(struct mount * mp,struct vnode * dvp,const char * name,int nmlen,struct smbfattr * fap,struct vnode ** vpp)273 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
274 struct smbfattr *fap, struct vnode **vpp)
275 {
276 struct vnode *vp;
277 int error;
278
279 *vpp = NULL;
280 error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
281 if (error)
282 return error;
283 if (fap)
284 smbfs_attr_cacheenter(vp, fap);
285 *vpp = vp;
286 return 0;
287 }
288
289 /*
290 * Free smbnode, and give vnode back to system
291 *
292 * smbfs_reclaim(struct vnode *a_vp)
293 */
294 int
smbfs_reclaim(struct vop_reclaim_args * ap)295 smbfs_reclaim(struct vop_reclaim_args *ap)
296 {
297 struct vnode *vp = ap->a_vp;
298 struct vnode *dvp;
299 struct smbnode *np = VTOSMB(vp);
300 struct smbmount *smp = VTOSMBFS(vp);
301
302 SMBVDEBUG("%s,%08x\n", np->n_name, vp->v_refcnt);
303
304 smbfs_hash_lock(smp, td);
305
306 dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
307 np->n_parent : NULL;
308
309 if (np->n_hash.le_prev)
310 LIST_REMOVE(np, n_hash);
311 if (smp->sm_root == np) {
312 SMBVDEBUG("root vnode\n");
313 smp->sm_root = NULL;
314 }
315 vp->v_data = NULL;
316 smbfs_hash_unlock(smp, td);
317 if (np->n_name)
318 smbfs_name_free(np->n_name);
319 kfree(np, M_SMBNODE);
320 if (dvp) {
321 /*
322 * Indicate that we released something; see comment
323 * in smbfs_unmount().
324 */
325 smp->sm_didrele = 1;
326 vrele(dvp);
327 }
328 return 0;
329 }
330
331 /*
332 * smbfs_inactive(struct vnode *a_vp)
333 */
334 int
smbfs_inactive(struct vop_inactive_args * ap)335 smbfs_inactive(struct vop_inactive_args *ap)
336 {
337 struct ucred *cred;
338 struct vnode *vp = ap->a_vp;
339 struct smbnode *np = VTOSMB(vp);
340 struct smb_cred scred;
341 int error;
342
343 SMBVDEBUG("%s: %08x\n", VTOSMB(vp)->n_name, vp->v_refcnt);
344 if (np->n_opencount) {
345 error = smbfs_vinvalbuf(vp, V_SAVE, 1);
346 cred = np->n_cached_cred;
347 np->n_cached_cred = NULL;
348 smb_makescred(&scred, curthread, cred);
349 error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
350 &np->n_mtime, &scred);
351 np->n_opencount = 0;
352 crfree(cred);
353 }
354 return (0);
355 }
356 /*
357 * routines to maintain vnode attributes cache
358 * smbfs_attr_cacheenter: unpack np.i to vattr structure
359 */
360 void
smbfs_attr_cacheenter(struct vnode * vp,struct smbfattr * fap)361 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
362 {
363 struct smbnode *np = VTOSMB(vp);
364
365 if (vp->v_type == VREG) {
366 if (np->n_size != fap->fa_size) {
367 np->n_size = fap->fa_size;
368 vnode_pager_setsize(vp, np->n_size);
369 }
370 } else if (vp->v_type == VDIR) {
371 np->n_size = 16384; /* should be a better way ... */
372 } else
373 return;
374 np->n_mtime = fap->fa_mtime;
375 np->n_dosattr = fap->fa_attr;
376 np->n_attrage = time_uptime;
377 return;
378 }
379
380 int
smbfs_attr_cachelookup(struct vnode * vp,struct vattr * va)381 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
382 {
383 struct smbnode *np = VTOSMB(vp);
384 struct smbmount *smp = VTOSMBFS(vp);
385 int diff;
386
387 diff = (int)(time_uptime - np->n_attrage);
388 if (diff > 2) /* XXX should be configurable */
389 return ENOENT;
390 va->va_type = vp->v_type; /* vnode type (for create) */
391 if (vp->v_type == VREG) {
392 va->va_mode = smp->sm_args.file_mode; /* files access mode and type */
393 } else if (vp->v_type == VDIR) {
394 va->va_mode = smp->sm_args.dir_mode; /* files access mode and type */
395 } else
396 return EINVAL;
397 va->va_size = np->n_size;
398 va->va_nlink = 1; /* number of references to file */
399 va->va_uid = smp->sm_args.uid; /* owner user id */
400 va->va_gid = smp->sm_args.gid; /* owner group id */
401 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
402 va->va_fileid = np->n_ino; /* file id */
403 if (va->va_fileid == 0)
404 va->va_fileid = 2;
405 va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
406 va->va_mtime = np->n_mtime;
407 va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */
408 va->va_gen = VNOVAL; /* generation number of file */
409 va->va_flags = 0; /* flags defined for file */
410 va->va_rmajor = VNOVAL; /* device the special file represents */
411 va->va_rminor = VNOVAL;
412 va->va_bytes = va->va_size; /* bytes of disk space held by file */
413 va->va_filerev = 0; /* file modification number */
414 va->va_vaflags = 0; /* operations flags */
415 return 0;
416 }
417
418 void
smbfs_attr_cacherename(struct vnode * vp,const char * name,int nmlen)419 smbfs_attr_cacherename(struct vnode *vp, const char *name, int nmlen)
420 {
421 struct smbnode_hashhead *nhpp;
422 struct smbmount *smp = VTOSMBFS(vp);
423 struct smbnode *np;
424 u_long hashval;
425
426 hashval = smbfs_hash(name, nmlen);
427
428 smbfs_hash_lock(smp, td);
429
430 np = VTOSMB(vp);
431 if (np->n_hash.le_prev)
432 LIST_REMOVE(np, n_hash);
433
434 smbfs_name_free(np->n_name);
435 np->n_nmlen = nmlen;
436 np->n_name = smbfs_name_alloc(name, nmlen);
437
438 nhpp = SMBFS_NOHASH(smp, hashval);
439 LIST_INSERT_HEAD(nhpp, np, n_hash);
440
441 smbfs_hash_unlock(smp, td);
442 }
443