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/globals.h"
23 /****************************************************************************
24 Normalise for DOS usage.
25 ****************************************************************************/
27 static void disk_norm(bool small_query, uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
29 /* check if the disk is beyond the max disk size */
30 uint64_t maxdisksize = lp_maxdisksize();
32 /* convert to blocks - and don't overflow */
33 maxdisksize = ((maxdisksize*1024)/(*bsize))*1024;
34 if (*dsize > maxdisksize) *dsize = maxdisksize;
35 if (*dfree > maxdisksize) *dfree = maxdisksize-1;
36 /* the -1 should stop applications getting div by 0
41 while (*dfree > WORDMAX || *dsize > WORDMAX || *bsize < 512) {
46 * Force max to fit in 16 bit fields.
48 if (*bsize > (WORDMAX*512)) {
49 *bsize = (WORDMAX*512);
62 /****************************************************************************
63 Return number of 1K blocks available on a path and total number.
64 ****************************************************************************/
66 uint64_t sys_disk_free(connection_struct *conn, const char *path, bool small_query,
67 uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
69 uint64_t dfree_retval;
73 const char *dfree_command;
75 (*dfree) = (*dsize) = 0;
79 * If external disk calculation specified, use it.
82 dfree_command = lp_dfree_command(SNUM(conn));
83 if (dfree_command && *dfree_command) {
88 syscmd = talloc_asprintf(talloc_tos(),
97 DEBUG (3, ("disk_free: Running command %s\n", syscmd));
99 lines = file_lines_pload(syscmd, NULL);
101 char *line = lines[0];
103 DEBUG (3, ("Read input from dfree, \"%s\"\n", line));
105 *dsize = STR_TO_SMB_BIG_UINT(line, &p);
106 while (p && *p && isspace(*p))
109 *dfree = STR_TO_SMB_BIG_UINT(p, &p);
110 while (p && *p && isspace(*p))
113 *bsize = STR_TO_SMB_BIG_UINT(p, NULL);
117 DEBUG (3, ("Parsed output of dfree, dsize=%u, dfree=%u, bsize=%u\n",
118 (unsigned int)*dsize, (unsigned int)*dfree, (unsigned int)*bsize));
125 DEBUG (0, ("disk_free: sys_popen() failed for command %s. Error was : %s\n",
126 syscmd, strerror(errno) ));
127 if (sys_fsusage(path, dfree, dsize) != 0) {
128 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
134 if (sys_fsusage(path, dfree, dsize) != 0) {
135 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
141 if (disk_quotas(path, &bsize_q, &dfree_q, &dsize_q)) {
143 (*dfree) = MIN(*dfree,dfree_q);
144 (*dsize) = MIN(*dsize,dsize_q);
147 /* FIXME : Any reason for this assumption ? */
149 DEBUG(5,("disk_free:Warning: bsize == %d < 256 . Changing to assumed correct bsize = 512\n",(int)*bsize));
155 DEBUG(0,("WARNING: dfree is broken on this system\n"));
158 *dsize = 20*1024*1024/(*bsize);
159 *dfree = MAX(1,*dfree);
162 disk_norm(small_query,bsize,dfree,dsize);
164 if ((*bsize) < 1024) {
165 dfree_retval = (*dfree)/(1024/(*bsize));
167 dfree_retval = ((*bsize)/1024)*(*dfree);
170 return(dfree_retval);
173 /****************************************************************************
174 Potentially returned cached dfree info.
175 ****************************************************************************/
177 uint64_t get_dfree_info(connection_struct *conn,
184 int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
185 struct dfree_cached_info *dfc = conn->dfree_info;
188 if (!dfree_cache_time) {
189 return SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
192 if (dfc && (conn->lastused - dfc->last_dfree_time < dfree_cache_time)) {
193 /* Return cached info. */
197 return dfc->dfree_ret;
200 dfree_ret = SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
202 if (dfree_ret == (uint64_t)-1) {
203 /* Don't cache bad data. */
207 /* No cached info or time to refresh. */
209 dfc = TALLOC_P(conn, struct dfree_cached_info);
213 conn->dfree_info = dfc;
219 dfc->dfree_ret = dfree_ret;
220 dfc->last_dfree_time = conn->lastused;