310 lines
6.4 KiB
C
310 lines
6.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <limits.h>
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#include <ctype.h>
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#include "common/parse-utils.h"
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#include "common/messages.h"
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#include "kernel-shared/volumes.h"
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int parse_u64(const char *str, u64 *result)
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{
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char *endptr;
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u64 val;
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val = strtoull(str, &endptr, 10);
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if (*endptr)
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return 1;
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*result = val;
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return 0;
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}
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/*
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* Parse range that's missing some part that can be implicit:
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* a..b - exact range, a can be equal to b
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* a.. - implicitly unbounded maximum (end == (u64)-1)
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* ..b - implicitly starting at 0
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* a - invalid; unclear semantics, use parse_u64 instead
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*
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* Returned values are u64, value validation and interpretation should be done
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* by the caller.
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*/
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int parse_range(const char *range, u64 *start, u64 *end)
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{
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char *dots;
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char *endptr;
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const char *rest;
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int skipped = 0;
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dots = strstr(range, "..");
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if (!dots)
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return 1;
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rest = dots + 2;
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if (!*rest) {
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*end = (u64)-1;
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skipped++;
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} else {
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*end = strtoull(rest, &endptr, 10);
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if (*endptr)
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return 1;
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}
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if (dots == range) {
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*start = 0;
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skipped++;
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} else {
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*start = strtoull(range, &endptr, 10);
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if (*endptr != 0 && *endptr != '.')
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return 1;
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}
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if (*start > *end) {
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error("range %llu..%llu doesn't make sense",
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(unsigned long long)*start,
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(unsigned long long)*end);
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return 1;
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}
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if (skipped <= 1)
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return 0;
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return 1;
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}
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/*
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* Convert 64bit range to 32bit with boundary checks
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*/
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static int range_to_u32(u64 start, u64 end, u32 *start32, u32 *end32)
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{
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if (start > (u32)-1)
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return 1;
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if (end != (u64)-1 && end > (u32)-1)
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return 1;
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*start32 = (u32)start;
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*end32 = (u32)end;
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return 0;
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}
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int parse_range_u32(const char *range, u32 *start, u32 *end)
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{
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u64 tmp_start;
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u64 tmp_end;
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if (parse_range(range, &tmp_start, &tmp_end))
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return 1;
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if (range_to_u32(tmp_start, tmp_end, start, end))
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return 1;
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return 0;
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}
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/*
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* Parse range and check if start < end
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*/
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int parse_range_strict(const char *range, u64 *start, u64 *end)
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{
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if (parse_range(range, start, end) == 0) {
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if (*start >= *end) {
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error("range %llu..%llu not allowed",
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(unsigned long long)*start,
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(unsigned long long)*end);
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return 1;
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}
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return 0;
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}
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return 1;
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}
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u64 parse_size_from_string(const char *s)
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{
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char c;
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char *endptr;
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u64 mult = 1;
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u64 ret;
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if (!s) {
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error("size value is empty");
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exit(1);
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}
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if (s[0] == '-') {
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error("size value '%s' is less equal than 0", s);
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exit(1);
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}
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ret = strtoull(s, &endptr, 10);
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if (endptr == s) {
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error("size value '%s' is invalid", s);
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exit(1);
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}
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if (endptr[0] && endptr[1]) {
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error("illegal suffix contains character '%c' in wrong position",
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endptr[1]);
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exit(1);
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}
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/*
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* strtoll returns LLONG_MAX when overflow, if this happens,
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* need to call strtoull to get the real size
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*/
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if (errno == ERANGE && ret == ULLONG_MAX) {
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error("size value '%s' is too large for u64", s);
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exit(1);
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}
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if (endptr[0]) {
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c = tolower(endptr[0]);
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switch (c) {
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case 'e':
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mult *= 1024;
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/* fallthrough */
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case 'p':
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mult *= 1024;
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/* fallthrough */
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case 't':
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mult *= 1024;
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/* fallthrough */
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case 'g':
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mult *= 1024;
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/* fallthrough */
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case 'm':
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mult *= 1024;
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/* fallthrough */
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case 'k':
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mult *= 1024;
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/* fallthrough */
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case 'b':
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break;
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default:
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error("unknown size descriptor '%c'", c);
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exit(1);
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}
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}
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/* Check whether ret * mult overflow */
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if (fls64(ret) + fls64(mult) - 1 > 64) {
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error("size value '%s' is too large for u64", s);
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exit(1);
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}
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ret *= mult;
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return ret;
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}
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enum btrfs_csum_type parse_csum_type(const char *s)
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{
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if (strcasecmp(s, "crc32c") == 0) {
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return BTRFS_CSUM_TYPE_CRC32;
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} else if (strcasecmp(s, "xxhash64") == 0 ||
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strcasecmp(s, "xxhash") == 0) {
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return BTRFS_CSUM_TYPE_XXHASH;
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} else if (strcasecmp(s, "sha256") == 0) {
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return BTRFS_CSUM_TYPE_SHA256;
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} else if (strcasecmp(s, "blake2b") == 0 ||
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strcasecmp(s, "blake2") == 0) {
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return BTRFS_CSUM_TYPE_BLAKE2;
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} else {
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error("unknown csum type %s", s);
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exit(1);
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}
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/* not reached */
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return 0;
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}
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/*
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* Parse name of the supported compression algorithm, without level, case
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* insensitive
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*/
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int parse_compress_type(const char *type)
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{
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if (strcasecmp(type, "zlib") == 0)
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return BTRFS_COMPRESS_ZLIB;
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else if (strcasecmp(type, "lzo") == 0)
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return BTRFS_COMPRESS_LZO;
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else if (strcasecmp(type, "zstd") == 0)
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return BTRFS_COMPRESS_ZSTD;
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else
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return -EINVAL;
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}
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/*
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* Find last set bit in a 64-bit word. Returns 0 if value is 0 or the position
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* of the last set bit if value is nonzero. The last (most significant) bit is
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* at position 64.
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*/
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int fls64(u64 x)
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{
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int i;
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for (i = 0; i < 64; i++)
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if (x << i & (1ULL << 63))
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return 64 - i;
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return 64 - i;
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}
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/*
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* Parse string description of block group profile and set that bit in @flags.
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* Return 1 if the profile is not valid, otherwise 0.
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*
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* String matched against btrfs_raid_array, case insensitive.
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*/
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int parse_bg_profile(const char *profile, u64 *flags)
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{
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int i;
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for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
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if (strcasecmp(btrfs_raid_array[i].upper_name, profile) == 0) {
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*flags |= btrfs_raid_array[i].bg_flag;
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return 0;
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}
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}
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return 1;
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}
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/*
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* Parse qgroupid of format LEVEL/ID, level and id are numerical, nothing must
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* follow after the last character of ID.
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*/
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int parse_qgroupid(const char *str, u64 *qgroupid)
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{
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char *end = NULL;
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u64 level;
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u64 id;
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level = strtoull(str, &end, 10);
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if (str == end)
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return -EINVAL;
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if (end[0] != '/')
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return -EINVAL;
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str = end + 1;
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end = NULL;
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id = strtoull(str, &end, 10);
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if (str == end)
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return -EINVAL;
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if (end[0])
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return -EINVAL;
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if (id >= (1ULL << BTRFS_QGROUP_LEVEL_SHIFT))
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return -ERANGE;
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if (level >= (1ULL << (64 - BTRFS_QGROUP_LEVEL_SHIFT)))
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return -ERANGE;
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*qgroupid = (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
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return 0;
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}
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