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btrfs-progs: mkfs: support parametric zone size 

In experimental build, read global '--param zone-size=SIZE' and use it
as emulated zone size.  This is for testing only, will be promoted to a
proper option in the future.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2023-08-10 15:22:46 +02:00
parent 12b1b03974
commit b4f43d72ff
2 changed files with 25 additions and 4 deletions
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25
kernel-shared/zoned.c
View File

@ -34,6 +34,7 @@
#include "common/device-utils.h"
#include "common/extent-cache.h"
#include "common/internal.h"
#include "common/parse-utils.h"
#include "common/messages.h"
#include "mkfs/common.h"
@ -44,7 +45,9 @@
/* Pseudo write pointer value for conventional zone */
#define WP_CONVENTIONAL ((u64)-2)
#define EMULATED_ZONE_SIZE SZ_256M
#define DEFAULT_EMULATED_ZONE_SIZE SZ_256M
static u64 emulated_zone_size = DEFAULT_EMULATED_ZONE_SIZE;
/*
* Minimum / maximum supported zone size. Currently, SMR disks have a zone size
@ -93,8 +96,22 @@ u64 zone_size(const char *file)
int ret;
/* Zoned emulation on regular device */
if (zoned_model(file) == ZONED_NONE)
return EMULATED_ZONE_SIZE;
if (zoned_model(file) == ZONED_NONE) {
const char *tmp;
u64 size = DEFAULT_EMULATED_ZONE_SIZE;
tmp = bconf_param_value("zone-size");
if (tmp) {
size = parse_size_from_string(tmp);
if (!is_power_of_2(size) || size < BTRFS_MIN_ZONE_SIZE ||
size > BTRFS_MAX_ZONE_SIZE) {
error("invalid emulated zone size %llu", size);
exit(1);
}
}
emulated_zone_size = size;
return emulated_zone_size;
}
ret = device_get_queue_param(file, "chunk_sectors", chunk, sizeof(chunk));
if (ret <= 0)
@ -125,7 +142,7 @@ static u64 max_zone_append_size(const char *file)
static int emulate_report_zones(const char *file, int fd, u64 pos,
struct blk_zone *zones, unsigned int nr_zones)
{
const sector_t zone_sectors = EMULATED_ZONE_SIZE >> SECTOR_SHIFT;
const sector_t zone_sectors = emulated_zone_size >> SECTOR_SHIFT;
struct stat st;
sector_t bdev_size;
unsigned int i;

4
mkfs/main.c
View File

@ -1217,6 +1217,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
{ "verbose", 0, NULL, 'v' },
{ "shrink", no_argument, NULL, GETOPT_VAL_SHRINK },
#if EXPERIMENTAL
{ "param", required_argument, NULL, GETOPT_VAL_PARAM },
{ "num-global-roots", required_argument, NULL, GETOPT_VAL_GLOBAL_ROOTS },
#endif
{ "help", no_argument, NULL, GETOPT_VAL_HELP },
@ -1350,6 +1351,9 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
btrfs_warn_experimental("Feature: num-global-roots is part of exten-tree-v2");
nr_global_roots = (int)arg_strtou64(optarg);
break;
case GETOPT_VAL_PARAM:
bconf_save_param(optarg);
break;
case GETOPT_VAL_HELP:
default:
usage(&mkfs_cmd, c != GETOPT_VAL_HELP);