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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C), 2008-2021, OPPO Mobile Comm Corp., Ltd.
* Created by Huang Jianan <huangjianan@oppo.com>
*/
#include <string.h>
#include <stdlib.h>
#include "erofs/err.h"
#include "erofs/list.h"
#include "erofs/print.h"
#include "erofs/compress_hints.h"
static LIST_HEAD(compress_hints_head);
static void dump_regerror(int errcode, const char *s, const regex_t *preg)
{
char str[512];
regerror(errcode, preg, str, sizeof(str));
erofs_err("invalid regex %s (%s)\n", s, str);
}
static int erofs_insert_compress_hints(const char *s, unsigned int blks)
{
struct erofs_compress_hints *r;
int ret;
r = malloc(sizeof(struct erofs_compress_hints));
if (!r)
return -ENOMEM;
ret = regcomp(&r->reg, s, REG_EXTENDED|REG_NOSUB);
if (ret) {
dump_regerror(ret, s, &r->reg);
goto err_out;
}
r->physical_clusterblks = blks;
list_add_tail(&r->list, &compress_hints_head);
erofs_info("compress hint %s (%u) is inserted", s, blks);
return ret;
err_out:
free(r);
return ret;
}
bool z_erofs_apply_compress_hints(struct erofs_inode *inode)
{
const char *s;
struct erofs_compress_hints *r;
unsigned int pclusterblks;
if (inode->z_physical_clusterblks)
return true;
s = erofs_fspath(inode->i_srcpath);
pclusterblks = cfg.c_pclusterblks_def;
list_for_each_entry(r, &compress_hints_head, list) {
int ret = regexec(&r->reg, s, (size_t)0, NULL, 0);
if (!ret) {
pclusterblks = r->physical_clusterblks;
break;
}
if (ret != REG_NOMATCH)
dump_regerror(ret, s, &r->reg);
}
inode->z_physical_clusterblks = pclusterblks;
/* pclusterblks is 0 means this file shouldn't be compressed */
return !!pclusterblks;
}
void erofs_cleanup_compress_hints(void)
{
struct erofs_compress_hints *r, *n;
list_for_each_entry_safe(r, n, &compress_hints_head, list) {
list_del(&r->list);
free(r);
}
}
int erofs_load_compress_hints(void)
{
char buf[PATH_MAX + 100];
FILE *f;
unsigned int line, max_pclustersize = 0;
if (!cfg.c_compress_hints_file)
return 0;
f = fopen(cfg.c_compress_hints_file, "r");
if (!f)
return -errno;
for (line = 1; fgets(buf, sizeof(buf), f); ++line) {
unsigned int pclustersize;
char *pattern;
pclustersize = atoi(strtok(buf, "\t "));
pattern = strtok(NULL, "\n");
if (!pattern || *pattern == '\0') {
erofs_err("cannot find a match pattern at line %u",
line);
return -EINVAL;
}
if (pclustersize % EROFS_BLKSIZ) {
erofs_warn("invalid physical clustersize %u, "
"use default pclusterblks %u",
pclustersize, cfg.c_pclusterblks_def);
continue;
}
erofs_insert_compress_hints(pattern,
pclustersize / EROFS_BLKSIZ);
if (pclustersize > max_pclustersize)
max_pclustersize = pclustersize;
}
fclose(f);
if (cfg.c_pclusterblks_max * EROFS_BLKSIZ < max_pclustersize) {
cfg.c_pclusterblks_max = max_pclustersize / EROFS_BLKSIZ;
erofs_warn("update max pclusterblks to %u", cfg.c_pclusterblks_max);
}
return 0;
}
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