Revision e09e200e07222467ef82367bff7cc6f44ad00397 authored by Andy Shevchenko on 30 September 2020, 14:20:12 UTC, committed by Linus Walleij on 01 October 2020, 08:00:17 UTC
In IRQ handler we have to clear bitmap before use. Currently the GCC extension has been used for that. For sake of the consistency switch to bitmap API. As expected bloat-o-meter shows no difference in the object size. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Link: https://lore.kernel.org/r/20200930142013.59247-1-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 parent 17479aa
fs_parser.c
// SPDX-License-Identifier: GPL-2.0-or-later
/* Filesystem parameter parser.
*
* Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/export.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/slab.h>
#include <linux/security.h>
#include <linux/namei.h>
#include "internal.h"
static const struct constant_table bool_names[] = {
{ "0", false },
{ "1", true },
{ "false", false },
{ "no", false },
{ "true", true },
{ "yes", true },
{ },
};
static const struct constant_table *
__lookup_constant(const struct constant_table *tbl, const char *name)
{
for ( ; tbl->name; tbl++)
if (strcmp(name, tbl->name) == 0)
return tbl;
return NULL;
}
/**
* lookup_constant - Look up a constant by name in an ordered table
* @tbl: The table of constants to search.
* @name: The name to look up.
* @not_found: The value to return if the name is not found.
*/
int lookup_constant(const struct constant_table *tbl, const char *name, int not_found)
{
const struct constant_table *p = __lookup_constant(tbl, name);
return p ? p->value : not_found;
}
EXPORT_SYMBOL(lookup_constant);
static inline bool is_flag(const struct fs_parameter_spec *p)
{
return p->type == NULL;
}
static const struct fs_parameter_spec *fs_lookup_key(
const struct fs_parameter_spec *desc,
struct fs_parameter *param, bool *negated)
{
const struct fs_parameter_spec *p, *other = NULL;
const char *name = param->key;
bool want_flag = param->type == fs_value_is_flag;
*negated = false;
for (p = desc; p->name; p++) {
if (strcmp(p->name, name) != 0)
continue;
if (likely(is_flag(p) == want_flag))
return p;
other = p;
}
if (want_flag) {
if (name[0] == 'n' && name[1] == 'o' && name[2]) {
for (p = desc; p->name; p++) {
if (strcmp(p->name, name + 2) != 0)
continue;
if (!(p->flags & fs_param_neg_with_no))
continue;
*negated = true;
return p;
}
}
}
return other;
}
/*
* fs_parse - Parse a filesystem configuration parameter
* @fc: The filesystem context to log errors through.
* @desc: The parameter description to use.
* @param: The parameter.
* @result: Where to place the result of the parse
*
* Parse a filesystem configuration parameter and attempt a conversion for a
* simple parameter for which this is requested. If successful, the determined
* parameter ID is placed into @result->key, the desired type is indicated in
* @result->t and any converted value is placed into an appropriate member of
* the union in @result.
*
* The function returns the parameter number if the parameter was matched,
* -ENOPARAM if it wasn't matched and @desc->ignore_unknown indicated that
* unknown parameters are okay and -EINVAL if there was a conversion issue or
* the parameter wasn't recognised and unknowns aren't okay.
*/
int __fs_parse(struct p_log *log,
const struct fs_parameter_spec *desc,
struct fs_parameter *param,
struct fs_parse_result *result)
{
const struct fs_parameter_spec *p;
result->uint_64 = 0;
p = fs_lookup_key(desc, param, &result->negated);
if (!p)
return -ENOPARAM;
if (p->flags & fs_param_deprecated)
warn_plog(log, "Deprecated parameter '%s'", param->key);
/* Try to turn the type we were given into the type desired by the
* parameter and give an error if we can't.
*/
if (is_flag(p)) {
if (param->type != fs_value_is_flag)
return inval_plog(log, "Unexpected value for '%s'",
param->key);
result->boolean = !result->negated;
} else {
int ret = p->type(log, p, param, result);
if (ret)
return ret;
}
return p->opt;
}
EXPORT_SYMBOL(__fs_parse);
/**
* fs_lookup_param - Look up a path referred to by a parameter
* @fc: The filesystem context to log errors through.
* @param: The parameter.
* @want_bdev: T if want a blockdev
* @_path: The result of the lookup
*/
int fs_lookup_param(struct fs_context *fc,
struct fs_parameter *param,
bool want_bdev,
struct path *_path)
{
struct filename *f;
unsigned int flags = 0;
bool put_f;
int ret;
switch (param->type) {
case fs_value_is_string:
f = getname_kernel(param->string);
if (IS_ERR(f))
return PTR_ERR(f);
put_f = true;
break;
case fs_value_is_filename:
f = param->name;
put_f = false;
break;
default:
return invalf(fc, "%s: not usable as path", param->key);
}
f->refcnt++; /* filename_lookup() drops our ref. */
ret = filename_lookup(param->dirfd, f, flags, _path, NULL);
if (ret < 0) {
errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name);
goto out;
}
if (want_bdev &&
!S_ISBLK(d_backing_inode(_path->dentry)->i_mode)) {
path_put(_path);
_path->dentry = NULL;
_path->mnt = NULL;
errorf(fc, "%s: Non-blockdev passed as '%s'",
param->key, f->name);
ret = -ENOTBLK;
}
out:
if (put_f)
putname(f);
return ret;
}
EXPORT_SYMBOL(fs_lookup_param);
int fs_param_bad_value(struct p_log *log, struct fs_parameter *param)
{
return inval_plog(log, "Bad value for '%s'", param->key);
}
int fs_param_is_bool(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
int b;
if (param->type != fs_value_is_string)
return fs_param_bad_value(log, param);
b = lookup_constant(bool_names, param->string, -1);
if (b == -1)
return fs_param_bad_value(log, param);
result->boolean = b;
return 0;
}
EXPORT_SYMBOL(fs_param_is_bool);
int fs_param_is_u32(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
int base = (unsigned long)p->data;
if (param->type != fs_value_is_string ||
kstrtouint(param->string, base, &result->uint_32) < 0)
return fs_param_bad_value(log, param);
return 0;
}
EXPORT_SYMBOL(fs_param_is_u32);
int fs_param_is_s32(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
if (param->type != fs_value_is_string ||
kstrtoint(param->string, 0, &result->int_32) < 0)
return fs_param_bad_value(log, param);
return 0;
}
EXPORT_SYMBOL(fs_param_is_s32);
int fs_param_is_u64(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
if (param->type != fs_value_is_string ||
kstrtoull(param->string, 0, &result->uint_64) < 0)
return fs_param_bad_value(log, param);
return 0;
}
EXPORT_SYMBOL(fs_param_is_u64);
int fs_param_is_enum(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
const struct constant_table *c;
if (param->type != fs_value_is_string)
return fs_param_bad_value(log, param);
c = __lookup_constant(p->data, param->string);
if (!c)
return fs_param_bad_value(log, param);
result->uint_32 = c->value;
return 0;
}
EXPORT_SYMBOL(fs_param_is_enum);
int fs_param_is_string(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
if (param->type != fs_value_is_string || !*param->string)
return fs_param_bad_value(log, param);
return 0;
}
EXPORT_SYMBOL(fs_param_is_string);
int fs_param_is_blob(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
if (param->type != fs_value_is_blob)
return fs_param_bad_value(log, param);
return 0;
}
EXPORT_SYMBOL(fs_param_is_blob);
int fs_param_is_fd(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
switch (param->type) {
case fs_value_is_string:
if (kstrtouint(param->string, 0, &result->uint_32) < 0)
break;
if (result->uint_32 <= INT_MAX)
return 0;
break;
case fs_value_is_file:
result->uint_32 = param->dirfd;
if (result->uint_32 <= INT_MAX)
return 0;
break;
default:
break;
}
return fs_param_bad_value(log, param);
}
EXPORT_SYMBOL(fs_param_is_fd);
int fs_param_is_blockdev(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
return 0;
}
EXPORT_SYMBOL(fs_param_is_blockdev);
int fs_param_is_path(struct p_log *log, const struct fs_parameter_spec *p,
struct fs_parameter *param, struct fs_parse_result *result)
{
return 0;
}
EXPORT_SYMBOL(fs_param_is_path);
#ifdef CONFIG_VALIDATE_FS_PARSER
/**
* validate_constant_table - Validate a constant table
* @name: Name to use in reporting
* @tbl: The constant table to validate.
* @tbl_size: The size of the table.
* @low: The lowest permissible value.
* @high: The highest permissible value.
* @special: One special permissible value outside of the range.
*/
bool validate_constant_table(const struct constant_table *tbl, size_t tbl_size,
int low, int high, int special)
{
size_t i;
bool good = true;
if (tbl_size == 0) {
pr_warn("VALIDATE C-TBL: Empty\n");
return true;
}
for (i = 0; i < tbl_size; i++) {
if (!tbl[i].name) {
pr_err("VALIDATE C-TBL[%zu]: Null\n", i);
good = false;
} else if (i > 0 && tbl[i - 1].name) {
int c = strcmp(tbl[i-1].name, tbl[i].name);
if (c == 0) {
pr_err("VALIDATE C-TBL[%zu]: Duplicate %s\n",
i, tbl[i].name);
good = false;
}
if (c > 0) {
pr_err("VALIDATE C-TBL[%zu]: Missorted %s>=%s\n",
i, tbl[i-1].name, tbl[i].name);
good = false;
}
}
if (tbl[i].value != special &&
(tbl[i].value < low || tbl[i].value > high)) {
pr_err("VALIDATE C-TBL[%zu]: %s->%d const out of range (%d-%d)\n",
i, tbl[i].name, tbl[i].value, low, high);
good = false;
}
}
return good;
}
/**
* fs_validate_description - Validate a parameter description
* @desc: The parameter description to validate.
*/
bool fs_validate_description(const char *name,
const struct fs_parameter_spec *desc)
{
const struct fs_parameter_spec *param, *p2;
bool good = true;
for (param = desc; param->name; param++) {
/* Check for duplicate parameter names */
for (p2 = desc; p2 < param; p2++) {
if (strcmp(param->name, p2->name) == 0) {
if (is_flag(param) != is_flag(p2))
continue;
pr_err("VALIDATE %s: PARAM[%s]: Duplicate\n",
name, param->name);
good = false;
}
}
}
return good;
}
#endif /* CONFIG_VALIDATE_FS_PARSER */
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