From: Johannes Thumshirn Date: Wed, 22 Oct 2025 09:19:59 +0000 (+0200) Subject: btrfs: zoned: show statistics for zoned filesystems X-Git-Tag: v6.19-rc1~167^2~66 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51070655e7d5749f9515e7a6ca1d5f49d1a76d81;p=thirdparty%2Fkernel%2Flinux.git btrfs: zoned: show statistics for zoned filesystems 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 Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index d66681ce2b3da..1f64c132b3873 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #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