1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
Unix SMB/CIFS implementation.
functions to calculate the free disk space
Copyright (C) Andrew Tridgell 1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/****************************************************************************
Normalise for DOS usage.
****************************************************************************/
static void disk_norm(BOOL small_query, SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize)
{
/* check if the disk is beyond the max disk size */
SMB_BIG_UINT maxdisksize = lp_maxdisksize();
if (maxdisksize) {
/* convert to blocks - and don't overflow */
maxdisksize = ((maxdisksize*1024)/(*bsize))*1024;
if (*dsize > maxdisksize) *dsize = maxdisksize;
if (*dfree > maxdisksize) *dfree = maxdisksize-1;
/* the -1 should stop applications getting div by 0
errors */
}
if(small_query) {
while (*dfree > WORDMAX || *dsize > WORDMAX || *bsize < 512) {
*dfree /= 2;
*dsize /= 2;
*bsize *= 2;
/*
* Force max to fit in 16 bit fields.
*/
if (*bsize > (WORDMAX*512)) {
*bsize = (WORDMAX*512);
if (*dsize > WORDMAX)
*dsize = WORDMAX;
if (*dfree > WORDMAX)
*dfree = WORDMAX;
break;
}
}
}
}
/****************************************************************************
Return number of 1K blocks available on a path and total number.
****************************************************************************/
SMB_BIG_UINT sys_disk_free(connection_struct *conn, const char *path, BOOL small_query,
SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize)
{
SMB_BIG_UINT dfree_retval;
SMB_BIG_UINT dfree_q = 0;
SMB_BIG_UINT bsize_q = 0;
SMB_BIG_UINT dsize_q = 0;
const char *dfree_command;
(*dfree) = (*dsize) = 0;
(*bsize) = 512;
/*
* If external disk calculation specified, use it.
*/
dfree_command = lp_dfree_command(SNUM(conn));
if (dfree_command && *dfree_command) {
const char *p;
char **lines = NULL;
char *syscmd = NULL;
syscmd = talloc_asprintf(talloc_tos(),
"%s %s",
dfree_command,
path);
if (!syscmd) {
return (SMB_BIG_UINT)-1;
}
DEBUG (3, ("disk_free: Running command %s\n", syscmd));
lines = file_lines_pload(syscmd, NULL);
if (lines) {
char *line = lines[0];
DEBUG (3, ("Read input from dfree, \"%s\"\n", line));
*dsize = STR_TO_SMB_BIG_UINT(line, &p);
while (p && *p && isspace(*p))
p++;
if (p && *p)
*dfree = STR_TO_SMB_BIG_UINT(p, &p);
while (p && *p && isspace(*p))
p++;
if (p && *p)
*bsize = STR_TO_SMB_BIG_UINT(p, NULL);
else
*bsize = 1024;
file_lines_free(lines);
DEBUG (3, ("Parsed output of dfree, dsize=%u, dfree=%u, bsize=%u\n",
(unsigned int)*dsize, (unsigned int)*dfree, (unsigned int)*bsize));
if (!*dsize)
*dsize = 2048;
if (!*dfree)
*dfree = 1024;
} else {
DEBUG (0, ("disk_free: sys_popen() failed for command %s. Error was : %s\n",
syscmd, strerror(errno) ));
if (sys_fsusage(path, dfree, dsize) != 0) {
DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
strerror(errno) ));
return (SMB_BIG_UINT)-1;
}
}
} else {
if (sys_fsusage(path, dfree, dsize) != 0) {
DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
strerror(errno) ));
return (SMB_BIG_UINT)-1;
}
}
if (disk_quotas(path, &bsize_q, &dfree_q, &dsize_q)) {
(*bsize) = bsize_q;
(*dfree) = MIN(*dfree,dfree_q);
(*dsize) = MIN(*dsize,dsize_q);
}
/* FIXME : Any reason for this assumption ? */
if (*bsize < 256) {
DEBUG(5,("disk_free:Warning: bsize == %d < 256 . Changing to assumed correct bsize = 512\n",(int)*bsize));
*bsize = 512;
}
if ((*dsize)<1) {
static int done;
if (!done) {
DEBUG(0,("WARNING: dfree is broken on this system\n"));
done=1;
}
*dsize = 20*1024*1024/(*bsize);
*dfree = MAX(1,*dfree);
}
disk_norm(small_query,bsize,dfree,dsize);
if ((*bsize) < 1024) {
dfree_retval = (*dfree)/(1024/(*bsize));
} else {
dfree_retval = ((*bsize)/1024)*(*dfree);
}
return(dfree_retval);
}
/****************************************************************************
Potentially returned cached dfree info.
****************************************************************************/
SMB_BIG_UINT get_dfree_info(connection_struct *conn,
const char *path,
BOOL small_query,
SMB_BIG_UINT *bsize,
SMB_BIG_UINT *dfree,
SMB_BIG_UINT *dsize)
{
int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
struct dfree_cached_info *dfc = conn->dfree_info;
SMB_BIG_UINT dfree_ret;
if (!dfree_cache_time) {
return SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
}
if (dfc && (conn->lastused - dfc->last_dfree_time < dfree_cache_time)) {
/* Return cached info. */
*bsize = dfc->bsize;
*dfree = dfc->dfree;
*dsize = dfc->dsize;
return dfc->dfree_ret;
}
dfree_ret = SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
if (dfree_ret == (SMB_BIG_UINT)-1) {
/* Don't cache bad data. */
return dfree_ret;
}
/* No cached info or time to refresh. */
if (!dfc) {
dfc = TALLOC_P(conn->mem_ctx, struct dfree_cached_info);
if (!dfc) {
return dfree_ret;
}
conn->dfree_info = dfc;
}
dfc->bsize = *bsize;
dfc->dfree = *dfree;
dfc->dsize = *dsize;
dfc->dfree_ret = dfree_ret;
dfc->last_dfree_time = conn->lastused;
return dfree_ret;
}
|
