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/>.
22 /****************************************************************************
23 Normalise for DOS usage.
24 ****************************************************************************/
26 static void disk_norm(BOOL small_query, SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize)
28 /* check if the disk is beyond the max disk size */
29 SMB_BIG_UINT maxdisksize = lp_maxdisksize();
31 /* convert to blocks - and don't overflow */
32 maxdisksize = ((maxdisksize*1024)/(*bsize))*1024;
33 if (*dsize > maxdisksize) *dsize = maxdisksize;
34 if (*dfree > maxdisksize) *dfree = maxdisksize-1;
35 /* the -1 should stop applications getting div by 0
40 while (*dfree > WORDMAX || *dsize > WORDMAX || *bsize < 512) {
45 * Force max to fit in 16 bit fields.
47 if (*bsize > (WORDMAX*512)) {
48 *bsize = (WORDMAX*512);
61 /****************************************************************************
62 Return number of 1K blocks available on a path and total number.
63 ****************************************************************************/
65 SMB_BIG_UINT sys_disk_free(connection_struct *conn, const char *path, BOOL small_query,
66 SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize)
68 SMB_BIG_UINT dfree_retval;
69 SMB_BIG_UINT dfree_q = 0;
70 SMB_BIG_UINT bsize_q = 0;
71 SMB_BIG_UINT dsize_q = 0;
72 const char *dfree_command;
74 (*dfree) = (*dsize) = 0;
78 * If external disk calculation specified, use it.
81 dfree_command = lp_dfree_command(SNUM(conn));
82 if (dfree_command && *dfree_command) {
87 slprintf(syscmd, sizeof(syscmd)-1, "%s %s", dfree_command, path);
88 DEBUG (3, ("disk_free: Running command %s\n", syscmd));
90 lines = file_lines_pload(syscmd, NULL);
92 char *line = lines[0];
94 DEBUG (3, ("Read input from dfree, \"%s\"\n", line));
96 *dsize = STR_TO_SMB_BIG_UINT(line, &p);
97 while (p && *p && isspace(*p))
100 *dfree = STR_TO_SMB_BIG_UINT(p, &p);
101 while (p && *p && isspace(*p))
104 *bsize = STR_TO_SMB_BIG_UINT(p, NULL);
107 file_lines_free(lines);
108 DEBUG (3, ("Parsed output of dfree, dsize=%u, dfree=%u, bsize=%u\n",
109 (unsigned int)*dsize, (unsigned int)*dfree, (unsigned int)*bsize));
116 DEBUG (0, ("disk_free: sys_popen() failed for command %s. Error was : %s\n",
117 syscmd, strerror(errno) ));
118 if (sys_fsusage(path, dfree, dsize) != 0) {
119 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
121 return (SMB_BIG_UINT)-1;
125 if (sys_fsusage(path, dfree, dsize) != 0) {
126 DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
128 return (SMB_BIG_UINT)-1;
132 if (disk_quotas(path, &bsize_q, &dfree_q, &dsize_q)) {
134 (*dfree) = MIN(*dfree,dfree_q);
135 (*dsize) = MIN(*dsize,dsize_q);
138 /* FIXME : Any reason for this assumption ? */
140 DEBUG(5,("disk_free:Warning: bsize == %d < 256 . Changing to assumed correct bsize = 512\n",(int)*bsize));
147 DEBUG(0,("WARNING: dfree is broken on this system\n"));
150 *dsize = 20*1024*1024/(*bsize);
151 *dfree = MAX(1,*dfree);
154 disk_norm(small_query,bsize,dfree,dsize);
156 if ((*bsize) < 1024) {
157 dfree_retval = (*dfree)/(1024/(*bsize));
159 dfree_retval = ((*bsize)/1024)*(*dfree);
162 return(dfree_retval);
165 /****************************************************************************
166 Potentially returned cached dfree info.
167 ****************************************************************************/
169 SMB_BIG_UINT get_dfree_info(connection_struct *conn,
176 int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
177 struct dfree_cached_info *dfc = conn->dfree_info;
178 SMB_BIG_UINT dfree_ret;
180 if (!dfree_cache_time) {
181 return SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
184 if (dfc && (conn->lastused - dfc->last_dfree_time < dfree_cache_time)) {
185 /* Return cached info. */
189 return dfc->dfree_ret;
192 dfree_ret = SMB_VFS_DISK_FREE(conn,path,small_query,bsize,dfree,dsize);
194 if (dfree_ret == (SMB_BIG_UINT)-1) {
195 /* Don't cache bad data. */
199 /* No cached info or time to refresh. */
201 dfc = TALLOC_P(conn->mem_ctx, struct dfree_cached_info);
205 conn->dfree_info = dfc;
211 dfc->dfree_ret = dfree_ret;
212 dfc->last_dfree_time = conn->lastused;