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DEFINITIONS
This source file includes following definitions.
- set_gpfs_sharemode
- set_gpfs_lease
- smbd_gpfs_getacl
- smbd_gpfs_putacl
- smbd_gpfs_get_realfilename_path
- init_gpfs_function_lib
- init_gpfs_function
- init_gpfs
- set_gpfs_lease
- set_gpfs_sharemode
- smbd_gpfs_getacl
- smbd_gpfs_putacl
- smbd_gpfs_get_realfilename_path
- init_gpfs
1 /*
2 * Unix SMB/CIFS implementation.
3 * Provide a connection to GPFS specific features
4 * Copyright (C) Volker Lendecke 2005
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21
22 #ifdef HAVE_GPFS
23
24 #include "gpfs_gpl.h"
25 #include "vfs_gpfs.h"
26
27 static bool gpfs_share_modes;
28 static bool gpfs_leases;
29 static bool gpfs_getrealfilename;
30
31 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
32 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
33 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
34 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
35 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
36 int *buflen);
37
38
39 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
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40 uint32 share_access)
41 {
42 unsigned int allow = GPFS_SHARE_NONE;
43 unsigned int deny = GPFS_DENY_NONE;
44 int result;
45
46 if (!gpfs_share_modes) {
47 return True;
48 }
49
50 if (gpfs_set_share_fn == NULL) {
51 return False;
52 }
53
54 if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
55 /* No real file, don't disturb */
56 return True;
57 }
58
59 allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
60 DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
61 allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
62 GPFS_SHARE_READ : 0;
63
64 if (allow == GPFS_SHARE_NONE) {
65 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
66 }
67 else {
68 deny |= (share_access & FILE_SHARE_WRITE) ?
69 0 : GPFS_DENY_WRITE;
70 deny |= (share_access & (FILE_SHARE_READ)) ?
71 0 : GPFS_DENY_READ;
72 }
73 DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
74 access_mask, allow, share_access, deny));
75
76 result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
77 if (result != 0) {
78 if (errno == ENOSYS) {
79 DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
80 "support has been compiled into Samba. Allowing access\n"));
81 return True;
82 } else {
83 DEBUG(10, ("gpfs_set_share failed: %s\n",
84 strerror(errno)));
85 }
86 }
87
88 return (result == 0);
89 }
90
91 int set_gpfs_lease(int fd, int leasetype)
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92 {
93 int gpfs_type = GPFS_LEASE_NONE;
94
95 if (!gpfs_leases) {
96 return True;
97 }
98
99 if (gpfs_set_lease_fn == NULL) {
100 errno = EINVAL;
101 return -1;
102 }
103
104 if (leasetype == F_RDLCK) {
105 gpfs_type = GPFS_LEASE_READ;
106 }
107 if (leasetype == F_WRLCK) {
108 gpfs_type = GPFS_LEASE_WRITE;
109 }
110
111 /* we unconditionally set CAP_LEASE, rather than looking for
112 -1/EACCES as there is a bug in some versions of
113 libgpfs_gpl.so which results in a leaked fd on /dev/ss0
114 each time we try this with the wrong capabilities set
115 */
116 linux_set_lease_capability();
117 return gpfs_set_lease_fn(fd, gpfs_type);
118 }
119
120 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
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121 {
122 if (gpfs_getacl_fn == NULL) {
123 errno = ENOSYS;
124 return -1;
125 }
126
127 return gpfs_getacl_fn(pathname, flags, acl);
128 }
129
130 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
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131 {
132 if (gpfs_putacl_fn == NULL) {
133 errno = ENOSYS;
134 return -1;
135 }
136
137 return gpfs_putacl_fn(pathname, flags, acl);
138 }
139
140 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
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141 int *buflen)
142 {
143 if ((!gpfs_getrealfilename)
144 || (gpfs_get_realfilename_path_fn == NULL)) {
145 errno = ENOSYS;
146 return -1;
147 }
148
149 return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
150 }
151
152 static bool init_gpfs_function_lib(void *plibhandle_pointer,
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153 const char *libname,
154 void *pfn_pointer, const char *fn_name)
155 {
156 bool did_open_here = false;
157 void **libhandle_pointer = (void **)plibhandle_pointer;
158 void **fn_pointer = (void **)pfn_pointer;
159
160 DEBUG(10, ("trying to load name %s from %s\n",
161 fn_name, libname));
162
163 if (*libhandle_pointer == NULL) {
164 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
165 did_open_here = true;
166 }
167 if (*libhandle_pointer == NULL) {
168 DEBUG(10, ("Could not open lib %s\n", libname));
169 return false;
170 }
171
172 *fn_pointer = dlsym(*libhandle_pointer, fn_name);
173 if (*fn_pointer == NULL) {
174 DEBUG(10, ("Did not find symbol %s in lib %s\n",
175 fn_name, libname));
176 if (did_open_here) {
177 dlclose(*libhandle_pointer);
178 *libhandle_pointer = NULL;
179 }
180 return false;
181 }
182
183 return true;
184 }
185
186 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
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187 {
188 static void *libgpfs_handle = NULL;
189 static void *libgpfs_gpl_handle = NULL;
190
191 if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
192 fn_pointer, fn_name)) {
193 return true;
194 }
195 if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
196 fn_pointer, fn_name)) {
197 return true;
198 }
199 return false;
200 }
201
202 void init_gpfs(void)
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203 {
204 init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
205 init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
206 init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
207 init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
208 init_gpfs_function(&gpfs_get_realfilename_path_fn,
209 "gpfs_get_realfilename_path");
210
211 gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
212 gpfs_leases = lp_parm_bool(-1, "gpfs", "leases", True);
213 gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
214 True);
215
216 return;
217 }
218
219 #else
220
221 int set_gpfs_lease(int snum, int leasetype)
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222 {
223 DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
224
225 /* We need to indicate that no GPFS is around by returning ENOSYS, so
226 * that the normal linux kernel oplock code is called. */
227 errno = ENOSYS;
228 return -1;
229 }
230
231 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
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232 uint32 share_access)
233 {
234 DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
235 /* Don't disturb but complain */
236 return True;
237 }
238
239 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
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240 {
241 errno = ENOSYS;
242 return -1;
243 }
244
245 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
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246 {
247 errno = ENOSYS;
248 return -1;
249 }
250
251 int smbd_gpfs_get_realfilename_path(char *pathname, char *fileamep,
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252 int *buflen)
253 {
254 errno = ENOSYS;
255 return -1;
256 }
257
258 void init_gpfs(void)
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259 {
260 return;
261 }
262
263 #endif /* HAVE_GPFS */