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/* This file is part of "reprepro"
* Copyright (C) 2007 Bernhard R. Link
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <config.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <unistd.h>
#include <strings.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "error.h"
#include "database.h"
#include "checksums.h"
#include "freespace.h"
struct device {
/*@null@*/struct device *next;
/* stat(2)'s st_dev number identifying this device */
dev_t id;
/* some directory in this filesystem */
char *somepath;
/* size of one block on this device according to statvfs(2) */
unsigned long blocksize;
/* blocks available for us */
fsblkcnt_t available;
/* blocks already known to be needed on that device */
fsblkcnt_t needed;
/* calculated block to keep free */
fsblkcnt_t reserved;
};
struct devices {
/*@null@*/struct device *root;
off_t reserved;
};
void space_free(struct devices *devices) {
struct device *d;
if (devices == NULL)
return;
while ((d = devices->root) != NULL) {
devices->root = d->next;
free(d->somepath);
free(d);
}
free(devices);
}
static retvalue device_find_or_create(struct devices *devices, dev_t id, const char *dirname, /*@out@*/struct device **result) {
struct device *d;
struct statvfs s;
int ret;
d = devices->root;
while (d != NULL && d->id != id)
d = d->next;
if (d != NULL) {
*result = d;
return RET_OK;
}
ret = statvfs(dirname, &s);
if (ret != 0) {
int e = errno;
fprintf(stderr,
"Error judging free space for the filesystem '%s' belongs to: %d=%s\n"
"(Take a look at --spacecheck in the manpage on how to modify checking.)\n",
dirname, e, strerror(e));
return RET_ERRNO(e);
}
d = NEW(struct device);
if (FAILEDTOALLOC(d))
return RET_ERROR_OOM;
d->next = devices->root;
d->id = id;
d->somepath = strdup(dirname);
if (FAILEDTOALLOC(d->somepath)) {
free(d);
return RET_ERROR_OOM;
}
d->blocksize = s.f_bsize;
/* use bfree when being root? but why run as root? */
d->available = s.f_bavail;
d->needed = 0;
/* always keep at least one megabyte spare */
d->reserved = devices->reserved/d->blocksize+1;
devices->root = d;
*result = d;
return RET_OK;
}
retvalue space_prepare(struct devices **devices, enum spacecheckmode mode, off_t reservedfordb, off_t reservedforothers) {
struct devices *n;
struct device *d;
struct stat s;
int ret;
retvalue r;
if (mode == scm_NONE) {
*devices = NULL;
return RET_OK;
}
assert (mode == scm_FULL);
n = NEW(struct devices);
if (FAILEDTOALLOC(n))
return RET_ERROR_OOM;
n->root = NULL;
n->reserved = reservedforothers;
ret = stat(global.dbdir, &s);
if (ret != 0) {
int e = errno;
fprintf(stderr, "Error stat'ing %s: %d=%s\n",
global.dbdir, e, strerror(e));
free(n);
return RET_ERRNO(e);
}
r = device_find_or_create(n, s.st_dev, global.dbdir, &d);
if (RET_WAS_ERROR(r)) {
space_free(n);
return r;
}
d->reserved += reservedfordb/d->blocksize+1;
*devices = n;
return RET_OK;
}
retvalue space_needed(struct devices *devices, const char *filename, const struct checksums *checksums) {
size_t l = strlen(filename);
char buffer[l+1];
struct stat s;
struct device *device;
int ret;
retvalue r;
fsblkcnt_t blocks;
off_t filesize;
if (devices == NULL)
return RET_NOTHING;
while (l > 0 && filename[l-1] != '/')
l--;
assert (l > 0);
memcpy(buffer, filename, l);
buffer[l] = '\0';
ret = stat(buffer, &s);
if (ret != 0) {
int e = errno;
fprintf(stderr, "Error stat'ing %s: %d=%s\n", filename,
e, strerror(e));
return RET_ERRNO(e);
}
r = device_find_or_create(devices, s.st_dev, buffer, &device);
if (RET_WAS_ERROR(r))
return r;
filesize = checksums_getfilesize(checksums);
blocks = (filesize + device->blocksize - 1) / device->blocksize;
device->needed += 1 + blocks;
return RET_OK;
}
retvalue space_check(struct devices *devices) {
struct device *device;
struct statvfs s;
int ret;
retvalue result = RET_OK;
if (devices == NULL)
return RET_NOTHING;
for (device = devices->root ; device != NULL ; device = device->next) {
/* recalculate free space, as created directories
* and other stuff might have changed it */
ret = statvfs(device->somepath, &s);
if (ret != 0) {
int e = errno;
fprintf(stderr,
"Error judging free space for the filesystem '%s' belongs to: %d=%s\n"
"(As this worked before in this run, something must have changed strangely)\n",
device->somepath,
e, strerror(e));
return RET_ERRNO(e);
}
if (device->blocksize != s.f_bsize) {
fprintf(stderr,
"The block size of the filesystem belonging to '%s' has changed.\n"
"Either something was mounted or unmounted while reprepro was running,\n"
"or some symlinks were changed. Aborting as utterly confused.\n",
device->somepath);
}
device->available = s.f_bavail;
if (device->needed >= device->available) {
fprintf(stderr,
"NOT ENOUGH FREE SPACE on filesystem 0x%lx (the filesystem '%s' is on)\n"
"available blocks %llu, needed blocks %llu, block size is %llu.\n",
(unsigned long)device->id, device->somepath,
(unsigned long long)device->available,
(unsigned long long)device->needed,
(unsigned long long)device->blocksize);
result = RET_ERROR;
} else if (device->reserved >= device->available ||
device->needed >= device->available - device->reserved) {
fprintf(stderr,
"NOT ENOUGH FREE SPACE on filesystem 0x%lx (the filesystem '%s' is on)\n"
"available blocks %llu, needed blocks %llu (+%llu safety margin), block size is %llu.\n"
"(Take a look at --spacecheck in the manpage for more information.)\n",
(unsigned long)device->id, device->somepath,
(unsigned long long)device->available,
(unsigned long long)device->needed,
(unsigned long long)device->reserved,
(unsigned long long)device->blocksize);
result = RET_ERROR;
}
}
return result;
}
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