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btrfs: zoned: show statistics about zoned filesystems in mountstats

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Add statistics output to /proc/<pid>/mountstats for zoned BTRFS, similar
to the zoned statistics from XFS in mountstats.

The output for /proc/<pid>/mountstats on an example filesystem will be as
follows:

  device /dev/vda mounted on /mnt with fstype btrfs
    zoned statistics:
          active block-groups: 7
            reclaimable: 0
            unused: 5
            need reclaim: false
          data relocation block-group: 1342177280
          active zones:
            start: 1073741824, wp: 268419072 used: 0, reserved: 268419072, unusable: 0
            start: 1342177280, wp: 0 used: 0, reserved: 0, unusable: 0
            start: 1610612736, wp: 49152 used: 16384, reserved: 16384, unusable: 16384
            start: 1879048192, wp: 950272 used: 131072, reserved: 622592, unusable: 196608
            start: 2147483648, wp: 212238336 used: 0, reserved: 212238336, unusable: 0
            start: 2415919104, wp: 0 used: 0, reserved: 0, unusable: 0
            start: 2684354560, wp: 0 used: 0, reserved: 0, unusable: 0

Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
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 2025-12-17 14:41:37 +01:00 committed by David Sterba
parent 68d4ece9c3
commit 6a5ac228d4
3 changed files with 75 additions and 0 deletions
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13
fs/btrfs/super.c
View File

@ -2483,6 +2483,18 @@ static void btrfs_shutdown(struct super_block *sb)
}
#endif
static int btrfs_show_stats(struct seq_file *seq, struct dentry *root)
{
struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
if (btrfs_is_zoned(fs_info)) {
btrfs_show_zoned_stats(fs_info, seq);
return 0;
}
return 0;
}
static const struct super_operations btrfs_super_ops = {
.drop_inode = btrfs_drop_inode,
.evict_inode = btrfs_evict_inode,
@ -2498,6 +2510,7 @@ static const struct super_operations btrfs_super_ops = {
.unfreeze_fs = btrfs_unfreeze,
.nr_cached_objects = btrfs_nr_cached_objects,
.free_cached_objects = btrfs_free_cached_objects,
.show_stats = btrfs_show_stats,
#ifdef CONFIG_BTRFS_EXPERIMENTAL
.remove_bdev = btrfs_remove_bdev,
.shutdown = btrfs_shutdown,

54
fs/btrfs/zoned.c
View File

@ -2984,3 +2984,57 @@ int btrfs_reset_unused_block_groups(struct btrfs_space_info *space_info, u64 num
return 0;
}
void btrfs_show_zoned_stats(struct btrfs_fs_info *fs_info, struct seq_file *seq)
{
struct btrfs_block_group *bg;
u64 data_reloc_bg;
u64 treelog_bg;
seq_puts(seq, "\n zoned statistics:\n");
spin_lock(&fs_info->zone_active_bgs_lock);
seq_printf(seq, "\tactive block-groups: %zu\n",
list_count_nodes(&fs_info->zone_active_bgs));
spin_unlock(&fs_info->zone_active_bgs_lock);
spin_lock(&fs_info->unused_bgs_lock);
seq_printf(seq, "\t reclaimable: %zu\n",
list_count_nodes(&fs_info->reclaim_bgs));
seq_printf(seq, "\t unused: %zu\n", list_count_nodes(&fs_info->unused_bgs));
spin_unlock(&fs_info->unused_bgs_lock);
seq_printf(seq,"\t need reclaim: %s\n",
str_true_false(btrfs_zoned_should_reclaim(fs_info)));
data_reloc_bg = data_race(fs_info->data_reloc_bg);
if (data_reloc_bg)
seq_printf(seq, "\tdata relocation block-group: %llu\n",
data_reloc_bg);
treelog_bg = data_race(fs_info->treelog_bg);
if (treelog_bg)
seq_printf(seq, "\ttree-log block-group: %llu\n", treelog_bg);
spin_lock(&fs_info->zone_active_bgs_lock);
seq_puts(seq, "\tactive zones:\n");
list_for_each_entry(bg, &fs_info->zone_active_bgs, active_bg_list) {
u64 start;
u64 alloc_offset;
u64 used;
u64 reserved;
u64 zone_unusable;
spin_lock(&bg->lock);
start = bg->start;
alloc_offset = bg->alloc_offset;
used = bg->used;
reserved = bg->reserved;
zone_unusable = bg->zone_unusable;
spin_unlock(&bg->lock);
seq_printf(seq,
"\t start: %llu, wp: %llu used: %llu, reserved: %llu, unusable: %llu\n",
start, alloc_offset, used, reserved, zone_unusable);
}
spin_unlock(&fs_info->zone_active_bgs_lock);
}

8
fs/btrfs/zoned.h
View File

@ -10,6 +10,7 @@
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/seq_file.h>
#include "messages.h"
#include "volumes.h"
#include "disk-io.h"
@ -96,6 +97,8 @@ int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info);
int btrfs_zoned_activate_one_bg(struct btrfs_space_info *space_info, bool do_finish);
void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info);
int btrfs_reset_unused_block_groups(struct btrfs_space_info *space_info, u64 num_bytes);
void btrfs_show_zoned_stats(struct btrfs_fs_info *fs_info, struct seq_file *seq);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
@ -275,6 +278,11 @@ static inline int btrfs_reset_unused_block_groups(struct btrfs_space_info *space
return 0;
}
static inline int btrfs_show_zoned_stats(struct btrfs_fs_info *fs_info, struct seq_file *seq)
{
return 0;
}
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)