Commit 5b316468 authored by Naohiro Aota's avatar Naohiro Aota Committed by David Sterba

btrfs: get zone information of zoned block devices

If a zoned block device is found, get its zone information (number of
zones and zone size).  To avoid costly run-time zone report
commands to test the device zones type during block allocation, attach
the seq_zones bitmap to the device structure to indicate if a zone is
sequential or accept random writes. Also it attaches the empty_zones
bitmap to indicate if a zone is empty or not.

This patch also introduces the helper function btrfs_dev_is_sequential()
to test if the zone storing a block is a sequential write required zone
and btrfs_dev_is_empty_zone() to test if the zone is a empty zone.
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarAnand Jain <anand.jain@oracle.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarNaohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 7b3d5a90
......@@ -16,6 +16,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
btrfs-$(CONFIG_BTRFS_FS_REF_VERIFY) += ref-verify.o
btrfs-$(CONFIG_BLK_DEV_ZONED) += zoned.o
btrfs-$(CONFIG_BTRFS_FS_RUN_SANITY_TESTS) += tests/free-space-tests.o \
tests/extent-buffer-tests.o tests/btrfs-tests.o \
......
......@@ -21,6 +21,7 @@
#include "rcu-string.h"
#include "dev-replace.h"
#include "sysfs.h"
#include "zoned.h"
/*
* Device replace overview
......@@ -313,6 +314,10 @@ static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
device->fs_devices = fs_info->fs_devices;
ret = btrfs_get_dev_zone_info(device);
if (ret)
goto error;
mutex_lock(&fs_info->fs_devices->device_list_mutex);
list_add(&device->dev_list, &fs_info->fs_devices->devices);
fs_info->fs_devices->num_devices++;
......
......@@ -2513,6 +2513,11 @@ static void __init btrfs_print_mod_info(void)
#endif
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
", ref-verify=on"
#endif
#ifdef CONFIG_BLK_DEV_ZONED
", zoned=yes"
#else
", zoned=no"
#endif
;
pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options);
......
......@@ -31,6 +31,7 @@
#include "space-info.h"
#include "block-group.h"
#include "discard.h"
#include "zoned.h"
const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
[BTRFS_RAID_RAID10] = {
......@@ -374,6 +375,7 @@ void btrfs_free_device(struct btrfs_device *device)
rcu_string_free(device->name);
extent_io_tree_release(&device->alloc_state);
bio_put(device->flush_bio);
btrfs_destroy_dev_zone_info(device);
kfree(device);
}
......@@ -667,6 +669,10 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
device->mode = flags;
ret = btrfs_get_dev_zone_info(device);
if (ret != 0)
goto error_free_page;
fs_devices->open_devices++;
if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) &&
device->devid != BTRFS_DEV_REPLACE_DEVID) {
......@@ -1137,6 +1143,7 @@ static void btrfs_close_one_device(struct btrfs_device *device)
device->bdev = NULL;
}
clear_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
btrfs_destroy_dev_zone_info(device);
device->fs_info = NULL;
atomic_set(&device->dev_stats_ccnt, 0);
......@@ -2541,10 +2548,17 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
}
rcu_assign_pointer(device->name, name);
device->fs_info = fs_info;
device->bdev = bdev;
ret = btrfs_get_dev_zone_info(device);
if (ret)
goto error_free_device;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto error_free_device;
goto error_free_zone;
}
q = bdev_get_queue(bdev);
......@@ -2557,8 +2571,6 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
fs_info->sectorsize);
device->disk_total_bytes = device->total_bytes;
device->commit_total_bytes = device->total_bytes;
device->fs_info = fs_info;
device->bdev = bdev;
set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
device->mode = FMODE_EXCL;
......@@ -2705,6 +2717,8 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
sb->s_flags |= SB_RDONLY;
if (trans)
btrfs_end_transaction(trans);
error_free_zone:
btrfs_destroy_dev_zone_info(device);
error_free_device:
btrfs_free_device(device);
error:
......
......@@ -52,6 +52,8 @@ struct btrfs_io_geometry {
#define BTRFS_DEV_STATE_FLUSH_SENT (4)
#define BTRFS_DEV_STATE_NO_READA (5)
struct btrfs_zoned_device_info;
struct btrfs_device {
struct list_head dev_list; /* device_list_mutex */
struct list_head dev_alloc_list; /* chunk mutex */
......@@ -65,6 +67,8 @@ struct btrfs_device {
struct block_device *bdev;
struct btrfs_zoned_device_info *zone_info;
/* the mode sent to blkdev_get */
fmode_t mode;
......
// SPDX-License-Identifier: GPL-2.0
#include <linux/slab.h>
#include <linux/blkdev.h>
#include "ctree.h"
#include "volumes.h"
#include "zoned.h"
#include "rcu-string.h"
/* Maximum number of zones to report per blkdev_report_zones() call */
#define BTRFS_REPORT_NR_ZONES 4096
static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
{
struct blk_zone *zones = data;
memcpy(&zones[idx], zone, sizeof(*zone));
return 0;
}
static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
struct blk_zone *zones, unsigned int *nr_zones)
{
int ret;
if (!*nr_zones)
return 0;
ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
copy_zone_info_cb, zones);
if (ret < 0) {
btrfs_err_in_rcu(device->fs_info,
"zoned: failed to read zone %llu on %s (devid %llu)",
pos, rcu_str_deref(device->name),
device->devid);
return ret;
}
*nr_zones = ret;
if (!ret)
return -EIO;
return 0;
}
int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
struct btrfs_zoned_device_info *zone_info = NULL;
struct block_device *bdev = device->bdev;
sector_t nr_sectors;
sector_t sector = 0;
struct blk_zone *zones = NULL;
unsigned int i, nreported = 0, nr_zones;
unsigned int zone_sectors;
int ret;
if (!bdev_is_zoned(bdev))
return 0;
if (device->zone_info)
return 0;
zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
if (!zone_info)
return -ENOMEM;
nr_sectors = bdev->bd_part->nr_sects;
zone_sectors = bdev_zone_sectors(bdev);
/* Check if it's power of 2 (see is_power_of_2) */
ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
zone_info->zone_size_shift = ilog2(zone_info->zone_size);
zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
if (!IS_ALIGNED(nr_sectors, zone_sectors))
zone_info->nr_zones++;
zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->seq_zones) {
ret = -ENOMEM;
goto out;
}
zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->empty_zones) {
ret = -ENOMEM;
goto out;
}
zones = kcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
if (!zones) {
ret = -ENOMEM;
goto out;
}
/* Get zones type */
while (sector < nr_sectors) {
nr_zones = BTRFS_REPORT_NR_ZONES;
ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
&nr_zones);
if (ret)
goto out;
for (i = 0; i < nr_zones; i++) {
if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
__set_bit(nreported, zone_info->seq_zones);
if (zones[i].cond == BLK_ZONE_COND_EMPTY)
__set_bit(nreported, zone_info->empty_zones);
nreported++;
}
sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
}
if (nreported != zone_info->nr_zones) {
btrfs_err_in_rcu(device->fs_info,
"inconsistent number of zones on %s (%u/%u)",
rcu_str_deref(device->name), nreported,
zone_info->nr_zones);
ret = -EIO;
goto out;
}
kfree(zones);
device->zone_info = zone_info;
/* device->fs_info is not safe to use for printing messages */
btrfs_info_in_rcu(NULL,
"host-%s zoned block device %s, %u zones of %llu bytes",
bdev_zoned_model(bdev) == BLK_ZONED_HM ? "managed" : "aware",
rcu_str_deref(device->name), zone_info->nr_zones,
zone_info->zone_size);
return 0;
out:
kfree(zones);
bitmap_free(zone_info->empty_zones);
bitmap_free(zone_info->seq_zones);
kfree(zone_info);
return ret;
}
void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!zone_info)
return;
bitmap_free(zone_info->seq_zones);
bitmap_free(zone_info->empty_zones);
kfree(zone_info);
device->zone_info = NULL;
}
int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
{
unsigned int nr_zones = 1;
int ret;
ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
if (ret != 0 || !nr_zones)
return ret ? ret : -EIO;
return 0;
}
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BTRFS_ZONED_H
#define BTRFS_ZONED_H
#include <linux/types.h>
struct btrfs_zoned_device_info {
/*
* Number of zones, zone size and types of zones if bdev is a
* zoned block device.
*/
u64 zone_size;
u8 zone_size_shift;
u32 nr_zones;
unsigned long *seq_zones;
unsigned long *empty_zones;
};
#ifdef CONFIG_BLK_DEV_ZONED
int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone);
int btrfs_get_dev_zone_info(struct btrfs_device *device);
void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
{
return 0;
}
static inline int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
return 0;
}
static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { }
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!zone_info)
return false;
return test_bit(pos >> zone_info->zone_size_shift, zone_info->seq_zones);
}
static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!zone_info)
return true;
return test_bit(pos >> zone_info->zone_size_shift, zone_info->empty_zones);
}
static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device,
u64 pos, bool set)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
unsigned int zno;
if (!zone_info)
return;
zno = pos >> zone_info->zone_size_shift;
if (set)
set_bit(zno, zone_info->empty_zones);
else
clear_bit(zno, zone_info->empty_zones);
}
static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, u64 pos)
{
btrfs_dev_set_empty_zone_bit(device, pos, true);
}
static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 pos)
{
btrfs_dev_set_empty_zone_bit(device, pos, false);
}
#endif
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