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5045 use atomic_{inc,dec}_* instead of atomic_add_*
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--- old/usr/src/uts/common/fs/sharefs/sharefs_vfsops.c
+++ new/usr/src/uts/common/fs/sharefs/sharefs_vfsops.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 */
25 25
26 26 #include <sys/atomic.h>
27 27 #include <sys/cmn_err.h>
28 28 #include <sys/errno.h>
29 29 #include <sys/mount.h>
30 30 #include <sharefs/sharefs.h>
31 31 #include <sys/vfs_opreg.h>
32 32 #include <sys/policy.h>
33 33 #include <sys/sunddi.h>
34 34 #include <sys/sysmacros.h>
35 35 #include <sys/systm.h>
36 36
37 37 #include <sys/mntent.h>
38 38 #include <sys/vfs.h>
39 39
40 40 /*
41 41 * Kernel sharetab filesystem.
42 42 *
43 43 * This is a pseudo filesystem which exports information about shares currently
44 44 * in kernel memory. The only element of the pseudo filesystem is a file.
45 45 *
46 46 * This file contains functions that interact with the VFS layer.
47 47 *
48 48 * sharetab sharefs_datanode_t sharefs.c
49 49 *
50 50 */
51 51
52 52 vnodeops_t *sharefs_ops_data;
53 53
54 54 static const fs_operation_def_t sharefs_vfstops[];
55 55 static gfs_opsvec_t sharefs_opsvec[];
56 56
57 57 static int sharefs_init(int, char *);
58 58
59 59 /*
60 60 * The sharefs system call.
61 61 */
62 62 static struct sysent sharefs_sysent = {
63 63 3,
64 64 SE_32RVAL1 | SE_ARGC | SE_NOUNLOAD,
65 65 sharefs
66 66 };
67 67
68 68 static struct modlsys modlsys = {
69 69 &mod_syscallops,
70 70 "sharefs syscall",
71 71 &sharefs_sysent
72 72 };
73 73
74 74 #ifdef _SYSCALL32_IMPL
75 75 static struct modlsys modlsys32 = {
76 76 &mod_syscallops32,
77 77 "sharefs syscall (32-bit)",
78 78 &sharefs_sysent
79 79 };
80 80 #endif /* _SYSCALL32_IMPL */
81 81
82 82 /*
83 83 * Module linkage
84 84 */
85 85 static mntopts_t sharefs_mntopts = {
86 86 0,
87 87 NULL
88 88 };
89 89
90 90 static vfsdef_t vfw = {
91 91 VFSDEF_VERSION,
92 92 "sharefs",
93 93 sharefs_init,
94 94 VSW_HASPROTO | VSW_ZMOUNT,
95 95 &sharefs_mntopts,
96 96 };
97 97
98 98 extern struct mod_ops mod_fsops;
99 99
100 100 static struct modlfs modlfs = {
101 101 &mod_fsops,
102 102 "sharetab filesystem",
103 103 &vfw
104 104 };
105 105
106 106 static struct modlinkage modlinkage = {
107 107 MODREV_1,
108 108 &modlfs,
109 109 &modlsys,
110 110 #ifdef _SYSCALL32_IMPL
111 111 &modlsys32,
112 112 #endif
113 113 NULL
114 114 };
115 115
116 116 int
117 117 _init(void)
118 118 {
119 119 return (mod_install(&modlinkage));
120 120 }
121 121
122 122 int
123 123 _info(struct modinfo *modinfop)
124 124 {
125 125 return (mod_info(&modlinkage, modinfop));
126 126 }
127 127
128 128 int
129 129 _fini(void)
130 130 {
131 131 /*
132 132 * The sharetab filesystem cannot be unloaded.
133 133 */
134 134 return (EBUSY);
135 135 }
136 136
137 137 /*
138 138 * Filesystem initialization.
139 139 */
140 140
141 141 static int sharefs_fstype;
142 142 static major_t sharefs_major;
143 143 static minor_t sharefs_minor;
144 144
145 145 static gfs_opsvec_t sharefs_opsvec[] = {
146 146 { "sharefs sharetab file", sharefs_tops_data, &sharefs_ops_data },
147 147 { NULL }
148 148 };
149 149
150 150 /* ARGSUSED */
151 151 static int
152 152 sharefs_init(int fstype, char *name)
153 153 {
154 154 vfsops_t *vfsops;
155 155 int error;
156 156
157 157 sharefs_fstype = fstype;
158 158 if (error = vfs_setfsops(fstype, sharefs_vfstops, &vfsops)) {
159 159 cmn_err(CE_WARN, "sharefs_init: bad vfs ops template");
160 160 return (error);
161 161 }
162 162
163 163 if (error = gfs_make_opsvec(sharefs_opsvec)) {
164 164 (void) vfs_freevfsops(vfsops);
165 165 return (error);
166 166 }
167 167
168 168 if ((sharefs_major = getudev()) == (major_t)-1) {
169 169 cmn_err(CE_WARN,
170 170 "sharefs_init: can't get unique device number");
171 171 sharefs_major = 0;
172 172 }
173 173
174 174 sharefs_sharetab_init();
175 175
176 176 return (0);
177 177 }
178 178
179 179 /*
180 180 * VFS entry points
181 181 */
182 182 static int
183 183 sharefs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
184 184 {
185 185 sharefs_vfs_t *data;
186 186 dev_t dev;
187 187
188 188 if (secpolicy_fs_mount(cr, mvp, vfsp) != 0)
189 189 return (EPERM);
190 190
191 191 if ((uap->flags & MS_OVERLAY) == 0 &&
192 192 (mvp->v_count > 1 || (mvp->v_flag & VROOT)))
193 193 return (EBUSY);
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194 194
195 195 data = kmem_alloc(sizeof (sharefs_vfs_t), KM_SLEEP);
196 196
197 197 /*
198 198 * Initialize vfs fields
199 199 */
200 200 vfsp->vfs_bsize = DEV_BSIZE;
201 201 vfsp->vfs_fstype = sharefs_fstype;
202 202 do {
203 203 dev = makedevice(sharefs_major,
204 - atomic_add_32_nv(&sharefs_minor, 1) & L_MAXMIN32);
204 + atomic_inc_32_nv(&sharefs_minor) & L_MAXMIN32);
205 205 } while (vfs_devismounted(dev));
206 206 vfs_make_fsid(&vfsp->vfs_fsid, dev, sharefs_fstype);
207 207 vfsp->vfs_data = data;
208 208 vfsp->vfs_dev = dev;
209 209
210 210 /*
211 211 * Create root
212 212 */
213 213 data->sharefs_vfs_root = sharefs_create_root_file(vfsp);
214 214
215 215 return (0);
216 216 }
217 217
218 218 static int
219 219 sharefs_unmount(vfs_t *vfsp, int flag, struct cred *cr)
220 220 {
221 221 sharefs_vfs_t *data;
222 222
223 223 if (secpolicy_fs_unmount(cr, vfsp) != 0)
224 224 return (EPERM);
225 225
226 226 /*
227 227 * We do not currently support forced unmounts
228 228 */
229 229 if (flag & MS_FORCE)
230 230 return (ENOTSUP);
231 231
232 232 /*
233 233 * We should never have a reference count of less than 2: one for the
234 234 * caller, one for the root vnode.
235 235 */
236 236 ASSERT(vfsp->vfs_count >= 2);
237 237
238 238 /*
239 239 * Any active vnodes will result in a hold on the root vnode
240 240 */
241 241 data = vfsp->vfs_data;
242 242 if (data->sharefs_vfs_root->v_count > 1)
243 243 return (EBUSY);
244 244
245 245 /*
246 246 * Only allow an unmount iff there are no entries in memory.
247 247 */
248 248 rw_enter(&sharetab_lock, RW_READER);
249 249 if (sharetab_size != 0) {
250 250 rw_exit(&sharetab_lock);
251 251 return (EBUSY);
252 252 }
253 253 rw_exit(&sharetab_lock);
254 254
255 255 /*
256 256 * Release the last hold on the root vnode
257 257 */
258 258 VN_RELE(data->sharefs_vfs_root);
259 259
260 260 kmem_free(data, sizeof (sharefs_vfs_t));
261 261
262 262 return (0);
263 263 }
264 264
265 265 static int
266 266 sharefs_root(vfs_t *vfsp, vnode_t **vpp)
267 267 {
268 268 sharefs_vfs_t *data = vfsp->vfs_data;
269 269
270 270 *vpp = data->sharefs_vfs_root;
271 271 VN_HOLD(*vpp);
272 272
273 273 return (0);
274 274 }
275 275
276 276 static int
277 277 sharefs_statvfs(vfs_t *vfsp, statvfs64_t *sp)
278 278 {
279 279 dev32_t d32;
280 280 int total = 1;
281 281
282 282 bzero(sp, sizeof (*sp));
283 283 sp->f_bsize = DEV_BSIZE;
284 284 sp->f_frsize = DEV_BSIZE;
285 285 sp->f_files = total;
286 286 sp->f_ffree = sp->f_favail = INT_MAX - total;
287 287 (void) cmpldev(&d32, vfsp->vfs_dev);
288 288 sp->f_fsid = d32;
289 289 (void) strlcpy(sp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name,
290 290 sizeof (sp->f_basetype));
291 291 sp->f_flag = vf_to_stf(vfsp->vfs_flag);
292 292 sp->f_namemax = SHAREFS_NAME_MAX;
293 293 (void) strlcpy(sp->f_fstr, "sharefs", sizeof (sp->f_fstr));
294 294
295 295 return (0);
296 296 }
297 297
298 298 static const fs_operation_def_t sharefs_vfstops[] = {
299 299 { VFSNAME_MOUNT, { .vfs_mount = sharefs_mount } },
300 300 { VFSNAME_UNMOUNT, { .vfs_unmount = sharefs_unmount } },
301 301 { VFSNAME_ROOT, { .vfs_root = sharefs_root } },
302 302 { VFSNAME_STATVFS, { .vfs_statvfs = sharefs_statvfs } },
303 303 { NULL }
304 304 };
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