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 * $Id: smbfs_node.c,v 1.54.52.1 2005/05/27 02:35:28 lindak Exp $
33 */
34
35 /*
36 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
37 * Use is subject to license terms.
38 */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/cred.h>
43 #include <sys/time.h>
44 #include <sys/vfs.h>
45 #include <sys/vnode.h>
46 #include <sys/kmem.h>
47 #include <sys/stat.h>
48 #include <sys/atomic.h>
49 #include <sys/cmn_err.h>
50 #include <sys/sysmacros.h>
51 #include <sys/bitmap.h>
52
53 #include <netsmb/smb_osdep.h>
54
55 #include <netsmb/smb.h>
56 #include <netsmb/smb_conn.h>
57 #include <netsmb/smb_subr.h>
58
59 #include <smbfs/smbfs.h>
60 #include <smbfs/smbfs_node.h>
61 #include <smbfs/smbfs_subr.h>
62
63 /*
64 * Lack of inode numbers leads us to the problem of generating them.
65 * Partially this problem can be solved by having a dir/file cache
66 * with inode numbers generated from the incremented by one counter.
67 * However this way will require too much kernel memory, gives all
68 * sorts of locking and consistency problems, not to mentinon counter
69 * overflows. So, I'm decided to use a hash function to generate
70 * pseudo random (and [often?] unique) inode numbers.
71 */
72
73 /* Magic constants for name hashing. */
74 #define FNV_32_PRIME ((uint32_t)0x01000193UL)
75 #define FNV1_32_INIT ((uint32_t)33554467UL)
76
77 static inline uint32_t
78 smbfs_hash(uint32_t ival, const char *name, int nmlen)
79 {
80 uint32_t v;
81
82 for (v = ival; nmlen; name++, nmlen--) {
83 v *= FNV_32_PRIME;
84 v ^= (uint32_t)*name;
85 }
86 return (v);
87 }
88
89 /*
90 * Compute the hash of the full (remote) path name
91 * using the three parts supplied separately.
92 */
93 uint32_t
94 smbfs_gethash(const char *rpath, int rplen)
95 {
96 uint32_t v;
97
98 v = smbfs_hash(FNV1_32_INIT, rpath, rplen);
99 return (v);
100 }
101
102 /*
103 * Like smbfs_gethash, but optimized a little by
104 * starting with the directory hash.
105 */
106 uint32_t
107 smbfs_getino(struct smbnode *dnp, const char *name, int nmlen)
108 {
109 uint32_t ino;
110 char sep;
111
112 /* Start with directory hash */
113 ino = (uint32_t)dnp->n_ino;
114
115 /* separator (maybe) */
116 sep = SMBFS_DNP_SEP(dnp);
117 if (sep)
118 ino = smbfs_hash(ino, &sep, 1);
119
120 /* Now hash this component. */
121 ino = smbfs_hash(ino, name, nmlen);
122
123 return (ino);
124 }
125
126 /*
127 * Allocate and copy a string of passed length.
128 * The passed length does NOT include the null.
129 */
130 char *
131 smbfs_name_alloc(const char *name, int nmlen)
132 {
133 char *cp;
134
135 cp = kmem_alloc(nmlen + 1, KM_SLEEP);
136 bcopy(name, cp, nmlen);
137 cp[nmlen] = 0;
138
139 return (cp);
140 }
141
142 /*
143 * Free string from smbfs_name_alloc(). Again,
144 * the passed length does NOT include the null.
145 */
146 void
147 smbfs_name_free(const char *name, int nmlen)
148 {
149 kmem_free((char *)name, nmlen + 1);
150 }
151
152 /*
153 * smbfs_nget()
154 *
155 * Find or create a node under some directory node.
156 */
157 int
158 smbfs_nget(vnode_t *dvp, const char *name, int nmlen,
159 struct smbfattr *fap, vnode_t **vpp)
160 {
161 struct smbnode *dnp = VTOSMB(dvp);
162 struct smbnode *np;
163 vnode_t *vp;
164 char sep;
165
166 ASSERT(fap != NULL);
167 *vpp = NULL;
168
169 /* Don't expect "" or "." or ".." here anymore. */
170 if (nmlen == 0 || (nmlen == 1 && name[0] == '.') ||
171 (nmlen == 2 && name[0] == '.' && name[1] == '.')) {
172 return (EINVAL);
173 }
174 sep = SMBFS_DNP_SEP(dnp);
175
176 /* Find or create the node. */
177 np = smbfs_node_findcreate(dnp->n_mount,
178 dnp->n_rpath, dnp->n_rplen,
179 name, nmlen, sep, fap);
180
181 /*
182 * We should have np now, because we passed
183 * fap != NULL to smbfs_node_findcreate.
184 */
185 ASSERT(np != NULL);
186 vp = SMBTOV(np);
187
188 /*
189 * Files in an XATTR dir are also XATTR.
190 */
191 if (dnp->n_flag & N_XATTR) {
192 mutex_enter(&np->r_statelock);
193 np->n_flag |= N_XATTR;
194 mutex_exit(&np->r_statelock);
195 }
196
197 /* BSD symlink hack removed (smb_symmagic) */
198
199 *vpp = vp;
200
201 return (0);
202 }
203
204 /*
205 * Update the local notion of the mtime of some directory.
206 * See comments re. r_mtime in smbfs_node.h
207 */
208 void
209 smbfs_attr_touchdir(struct smbnode *dnp)
210 {
211
212 mutex_enter(&dnp->r_statelock);
213
214 /*
215 * Now that we keep the client's notion of mtime
216 * separately from the server, this is easy.
217 */
218 dnp->r_mtime = gethrtime();
219
220 /*
221 * Invalidate the cache, so that we go to the wire
222 * to check that the server doesn't have a better
223 * timestamp next time we care.
224 */
225 smbfs_attrcache_rm_locked(dnp);
226 mutex_exit(&dnp->r_statelock);
227 }
228
229 void
230 smbfs_attrcache_remove(struct smbnode *np)
231 {
232 mutex_enter(&np->r_statelock);
233 /* smbfs_attrcache_rm_locked(np); */
234 np->r_attrtime = gethrtime();
235 mutex_exit(&np->r_statelock);
236 }
237
238 /* See smbfs_node.h */
239 #undef smbfs_attrcache_rm_locked
240 void
241 smbfs_attrcache_rm_locked(struct smbnode *np)
242 {
243 ASSERT(MUTEX_HELD(&np->r_statelock));
244 np->r_attrtime = gethrtime();
245 }