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gc.c
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gc.c
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/*
* schizo, a set of tools for managing split disk images
* Copyright (C) 2021 Lennert Buytenhek
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version
* 2.1 as published by the Free Software Foundation.
*
* This library 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 Lesser General Public License version 2.1 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License version 2.1 along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "enumerate_chunks.h"
#include "enumerate_images.h"
#include "enumerate_image_chunks.h"
#include "schizo.h"
static int num_images;
static struct iv_avl_tree images;
static struct iv_avl_tree chunks[65536];
static struct repo *r;
static uint64_t num_gcd;
struct gc_thread_state {
int deldir;
uint64_t num_gcd;
};
static void gc_thread_init(void *_gts)
{
struct gc_thread_state *gts = _gts;
gts->deldir = r->deldir;
gts->num_gcd = 0;
}
static int try_open_deldir(struct gc_thread_state *gts)
{
int dir;
dir = openat(r->repodir, "deleted", O_DIRECTORY);
if (dir < 0) {
if (errno == ENOENT) {
int ret;
ret = mkdirat(r->repodir, "deleted", 0777);
if (ret < 0 && errno != EEXIST) {
perror("mkdirat");
return -1;
}
dir = openat(r->repodir, "deleted", O_DIRECTORY);
}
if (dir < 0) {
perror("openat");
return -1;
}
}
gts->deldir = dir;
return 0;
}
static int use_deldir(struct gc_thread_state *gts)
{
if (gts->deldir == -1 && try_open_deldir(gts) < 0)
gts->deldir = -2;
if (gts->deldir == -2)
return 0;
return 1;
}
static void check_gc_chunk(void *_gts, int section, const char *dir,
int dirfd, const char *name, const uint8_t *hash)
{
struct gc_thread_state *gts = _gts;
struct chunk *c;
c = find_chunk(&chunks[section], hash, hash_size);
if (c != NULL)
return;
fprintf(stderr, "chunk %s/%s not referenced\n", dir, name);
if (use_deldir(gts)) {
renameat2(dirfd, name, gts->deldir, name, RENAME_NOREPLACE);
gts->num_gcd++;
}
}
static void gc_thread_deinit(void *_gts)
{
struct gc_thread_state *gts = _gts;
num_gcd += gts->num_gcd;
if (gts->deldir != -1 && gts->deldir != r->deldir)
close(gts->deldir);
}
int gc(int argc, char *argv[])
{
int i;
if (argc)
return -1;
num_images = enumerate_images(&images, &rs);
enumerate_image_chunks(chunks, hash_size, num_images, &images, 128);
for (i = 0; i < rs.num_repos; i++) {
r = rs.repos[i];
num_gcd = 0;
enumerate_chunks(r, hash_size, sizeof(struct gc_thread_state),
128, gc_thread_init, NULL, check_gc_chunk,
gc_thread_deinit);
if (num_gcd)
printf("\nGCd %" PRId64 " chunks\n", num_gcd);
}
return 0;
}