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/*
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"
#include "smbd/smbd.h"
#include "smbd/globals.h"
/****************************************************************************
Normalise for DOS usage.
****************************************************************************/
static void disk_norm(bool small_query, uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
{
/* check if the disk is beyond the max disk size */
uint64_t 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.
****************************************************************************/
uint64_t sys_disk_free(connection_struct *conn, const char *path, bool small_query,
uint64_t *bsize,uint64_t *dfree,uint64_t *dsize)
{
uint64_t dfree_retval;
uint64_t dfree_q = 0;
uint64_t bsize_q = 0;
uint64_t 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 (uint64_t)-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;
TALLOC_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 (uint64_t)-1;
}
}
} else {
if (sys_fsusage(path, dfree, dsize) != 0) {
DEBUG (0, ("disk_free: sys_fsusage() failed. Error was : %s\n",
strerror(errno) ));
return (uint64_t)-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) {
if (!dfree_broken) {
DEBUG(0,("WARNING: dfree is broken on this system\n"));
dfree_broken=true;
}
*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.
****************************************************************************/
uint64_t get_dfree_info(connection_struct *conn,
const char *path,
bool small_query,
uint64_t *bsize,
uint64_t *dfree,
uint64_t *dsize)
{
int dfree_cache_time = lp_dfree_cache_time(SNUM(conn));
struct dfree_cached_info *dfc = conn->dfree_info;
uint64_t 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 == (uint64_t)-1) {
/* Don't cache bad data. */
return dfree_ret;
}
/* No cached info or time to refresh. */
if (!dfc) {
dfc = talloc(conn, 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;
}
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