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btrfs: zoned: show statistics for zoned filesystems

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Provide statistics for zoned filesystems. These statistics include, the
number of active block-groups, how many of them are reclaimable or unused,
if the filesystem needs to be reclaimed, the currently assigned relocation
and treelog block-groups if they're present and a list of active zones.

Example:
  active block-groups: 4
    reclaimable: 0
    unused: 2
    need reclaim: false
  data relocation block-group: 4294967296
  active zones:
    start: 1610612736, wp: 344064 used: 16384, reserved: 0, unusable: 327680
    start: 1879048192, wp: 34963456 used: 131072, reserved: 0, unusable: 34832384
    start: 4026531840, wp: 0 used: 0, reserved: 0, unusable: 0
    start: 4294967296, wp: 0 used: 0, reserved: 0, unusable: 0

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn
2025-10-22 11:19:59 +02:00
committed by David Sterba
parent 252877a870
commit 51070655e7
1 changed files with 53 additions and 0 deletions
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53
fs/btrfs/sysfs.c
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@@ -10,6 +10,7 @@
#include <linux/completion.h>
#include <linux/bug.h>
#include <linux/list.h>
#include <linux/string_choices.h>
#include <crypto/hash.h>
#include "messages.h"
#include "ctree.h"
@@ -25,6 +26,7 @@
#include "misc.h"
#include "fs.h"
#include "accessors.h"
#include "zoned.h"
/*
* Structure name Path
@@ -1187,6 +1189,56 @@ static ssize_t btrfs_commit_stats_store(struct kobject *kobj,
}
BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store);
static ssize_t btrfs_zoned_stats_show(struct kobject *kobj,
struct kobj_attribute *a, char *buf)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
struct btrfs_block_group *bg;
size_t ret = 0;
if (!btrfs_is_zoned(fs_info))
return ret;
spin_lock(&fs_info->zone_active_bgs_lock);
ret += sysfs_emit_at(buf, ret, "active block-groups: %zu\n",
list_count_nodes(&fs_info->zone_active_bgs));
spin_unlock(&fs_info->zone_active_bgs_lock);
mutex_lock(&fs_info->reclaim_bgs_lock);
spin_lock(&fs_info->unused_bgs_lock);
ret += sysfs_emit_at(buf, ret, "\treclaimable: %zu\n",
list_count_nodes(&fs_info->reclaim_bgs));
ret += sysfs_emit_at(buf, ret, "\tunused: %zu\n",
list_count_nodes(&fs_info->unused_bgs));
spin_unlock(&fs_info->unused_bgs_lock);
mutex_unlock(&fs_info->reclaim_bgs_lock);
ret += sysfs_emit_at(buf, ret, "\tneed reclaim: %s\n",
str_true_false(btrfs_zoned_should_reclaim(fs_info)));
if (fs_info->data_reloc_bg)
ret += sysfs_emit_at(buf, ret,
"data relocation block-group: %llu\n",
fs_info->data_reloc_bg);
if (fs_info->treelog_bg)
ret += sysfs_emit_at(buf, ret,
"tree-log block-group: %llu\n",
fs_info->treelog_bg);
spin_lock(&fs_info->zone_active_bgs_lock);
ret += sysfs_emit_at(buf, ret, "active zones:\n");
list_for_each_entry(bg, &fs_info->zone_active_bgs, active_bg_list) {
ret += sysfs_emit_at(buf, ret,
"\tstart: %llu, wp: %llu used: %llu, reserved: %llu, unusable: %llu\n",
bg->start, bg->alloc_offset, bg->used,
bg->reserved, bg->zone_unusable);
}
spin_unlock(&fs_info->zone_active_bgs_lock);
return ret;
}
BTRFS_ATTR(, zoned_stats, btrfs_zoned_stats_show);
static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
struct kobj_attribute *a, char *buf)
{
@@ -1599,6 +1651,7 @@ static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, bg_reclaim_threshold),
BTRFS_ATTR_PTR(, commit_stats),
BTRFS_ATTR_PTR(, temp_fsid),
BTRFS_ATTR_PTR(, zoned_stats),
#ifdef CONFIG_BTRFS_EXPERIMENTAL
BTRFS_ATTR_PTR(, offload_csum),
#endif