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// SPDX-License-Identifier: GPL-2.0+ OR Apache-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);
}
/* algorithmtype is actually ccfg # here */
static int erofs_insert_compress_hints(const char *s, unsigned int blks,
unsigned int algorithmtype)
{
struct erofs_compress_hints *ch;
int ret;
ch = malloc(sizeof(struct erofs_compress_hints));
if (!ch)
return -ENOMEM;
ret = regcomp(&ch->reg, s, REG_EXTENDED|REG_NOSUB);
if (ret) {
dump_regerror(ret, s, &ch->reg);
free(ch);
return ret;
}
ch->physical_clusterblks = blks;
ch->algorithmtype = algorithmtype;
list_add_tail(&ch->list, &compress_hints_head);
erofs_info("compress hint %s (%u) is inserted", s, blks);
return ret;
}
bool z_erofs_apply_compress_hints(struct erofs_importer *im,
struct erofs_inode *inode)
{
const struct erofs_importer_params *params = im->params;
unsigned int pclusterblks = params->pclusterblks_def;
unsigned int algorithmtype;
struct erofs_compress_hints *r;
const char *s;
if (inode->z_physical_clusterblks)
return true;
s = erofs_fspath(inode->i_srcpath);
algorithmtype = 0;
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;
algorithmtype = r->algorithmtype;
break;
}
if (ret != REG_NOMATCH)
dump_regerror(ret, s, &r->reg);
}
inode->z_physical_clusterblks = pclusterblks;
inode->z_algorithmtype[0] = algorithmtype;
/* pclusterblks is 0 means this file shouldn't be compressed */
return pclusterblks != 0;
}
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(struct erofs_importer *im,
struct erofs_sb_info *sbi)
{
struct erofs_importer_params *params = im->params;
char buf[PATH_MAX + 100];
FILE *f;
unsigned int line, max_pclusterblks = 0;
int ret = 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, pclusterblks, ccfg;
char *alg, *pattern;
if (*buf == '#' || *buf == '\n')
continue;
pclustersize = atoi(strtok(buf, "\t "));
alg = strtok(NULL, "\n\t ");
pattern = strtok(NULL, "\n");
if (!pattern) {
pattern = alg;
alg = NULL;
}
if (!pattern || *pattern == '\0') {
erofs_err("cannot find a match pattern at line %u",
line);
ret = -EINVAL;
goto out;
}
if (!alg || *alg == '\0') {
ccfg = 0;
} else {
ccfg = atoi(alg);
if (ccfg >= EROFS_MAX_COMPR_CFGS ||
!params->z_paramsets[ccfg].alg) {
erofs_err("invalid compressing configuration \"%s\" at line %u",
alg, line);
ret = -EINVAL;
goto out;
}
}
if (pclustersize % erofs_blksiz(sbi)) {
erofs_warn("invalid physical clustersize %u, use default pclustersize (%u blocks)",
pclustersize, params->pclusterblks_max);
continue;
}
pclusterblks = pclustersize >> sbi->blkszbits;
erofs_insert_compress_hints(pattern, pclusterblks, ccfg);
if (pclusterblks > max_pclusterblks)
max_pclusterblks = pclusterblks;
}
if (params->pclusterblks_max < max_pclusterblks) {
erofs_warn("update max pclustersize to %u blocks",
max_pclusterblks);
params->pclusterblks_max = max_pclusterblks;
}
out:
fclose(f);
return ret;
}
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