2 Unix SMB/CIFS implementation.
3 functions to calculate the free disk space
4 Copyright (C) Andrew Tridgell 1998
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.
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.
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/>.
21 #include "smbd/smbd.h"
22 #include "smbd/globals.h"
24 /****************************************************************************
25 Normalise for DOS usage.
26 ****************************************************************************/
28 static void disk_norm(bool small_query, uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
30 /* check if the disk is beyond the max disk size */
31 uint64_t maxdisksize = lp_maxdisksize();
33 /* convert to blocks - and don't overflow */
34 maxdisksize = ((maxdisksize*1024)/(*bsize))*1024;
35 if (*dsize > maxdisksize) *dsize = maxdisksize;
36 if (*dfree > maxdisksize) *dfree = maxdisksize-1;
37 /* the -1 should stop applications getting div by 0
42 while (*dfree > WORDMAX || *dsize > WORDMAX || *bsize < 512) {
47 * Force max to fit in 16 bit fields.
49 if (*bsize > (WORDMAX*512)) {
50 *bsize = (WORDMAX*512);
63 /****************************************************************************
64 Return number of 1K blocks available on a path and total number.
65 ****************************************************************************/
67 uint64_t sys_disk_free(connection_struct *conn, const char *path, bool small_query,
68 uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
70 uint64_t dfree_retval;
74 const char *dfree_command;
76 (*dfree) = (*dsize) = 0;
80 * If external disk calculation specified, use it.
83 dfree_command = lp_dfree_command(SNUM(conn));
84 if (dfree_command && *dfree_command) {
89 syscmd = talloc_asprintf(talloc_tos(),
98 DEBUG (3, ("disk_free: Running command %s\n", syscmd));
100 lines = file_lines_pload(syscmd, NULL);
102 char *line = lines[0];
104 DEBUG (3, ("Read input from dfree, \"%s\"\n", line));
106 *dsize = STR_TO_SMB_BIG_UINT(line, &p);
107 while (p && *p && isspace(*p))
110 *dfree = STR_TO_SMB_BIG_UINT(p, &p);
111 while (p && *p && isspace(*p))
114 *bsize = STR_TO_SMB_BIG_UINT(p, NULL);
118 DEBUG (3, ("Parsed output of dfree, dsize=%u, dfree=%u, bsize=%u\n",
119 (unsigned int)*dsize, (unsigned int)*dfree, (unsigned int)*bsize));
126 DEBUG (0, ("disk_free: sys_popen() failed for command %s. Error was : %s\n",
127 syscmd, strerror(errno) ));
128 if (sys_fsusage(path, dfree, dsize) != 0) {
129 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
135 if (sys_fsusage(path, dfree, dsize) != 0) {
136 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
142 if (disk_quotas(path, &bsize_q, &dfree_q, &dsize_q)) {
144 (*dfree) = MIN(*dfree,dfree_q);
145 (*dsize) = MIN(*dsize,dsize_q);
148 /* FIXME : Any reason for this assumption ? */
150 DEBUG(5,("disk_free:Warning: bsize == %d < 256 . Changing to assumed correct bsize = 512\n",(int)*bsize));
156 DEBUG(0,("WARNING: dfree is broken on this system\n"));
159 *dsize = 20*1024*1024/(*bsize);
160 *dfree = MAX(1,*dfree);
163 disk_norm(small_query,bsize,dfree,dsize);
165 if ((*bsize) < 1024) {
166 dfree_retval = (*dfree)/(1024/(*bsize));
168 dfree_retval = ((*bsize)/1024)*(*dfree);
171 return(dfree_retval);
174 /****************************************************************************
175 Potentially returned cached dfree info.
176 ****************************************************************************/
178 uint64_t get_dfree_info(connection_struct *conn,
185 int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
186 struct dfree_cached_info *dfc = conn->dfree_info;
189 if (!dfree_cache_time) {
190 return SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
193 if (dfc && (conn->lastused - dfc->last_dfree_time < dfree_cache_time)) {
194 /* Return cached info. */
198 return dfc->dfree_ret;
201 dfree_ret = SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
203 if (dfree_ret == (uint64_t)-1) {
204 /* Don't cache bad data. */
208 /* No cached info or time to refresh. */
210 dfc = talloc(conn, struct dfree_cached_info);
214 conn->dfree_info = dfc;
220 dfc->dfree_ret = dfree_ret;
221 dfc->last_dfree_time = conn->lastused;