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btrfs-progs: fi usage: print zone unusable in the overview

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Print the total zone_unusable size in the summary for 'fi usage' for a
filesystem in zoned mode. It's a sum of all the zone_unusable values
from 'fi df'. Per-device stats are not implemented and would need more
complicated calculations from raw data, kernel does not export that (but
it could).

As of 5.12, the zone_unusable is stored only in memory so we'd have to
map raw block device zones to the block groups and the live extents in
the associated block groups to get the exact numbers.

Example:

  # btrfs fi usage /mnt
  Overall:
      Device size:                   2.00GiB
      Device allocated:            768.00MiB
      Device unallocated:            1.25GiB
      Device missing:                  0.00B
      Device zone unusable:        320.00KiB
      Used:                        128.00KiB
      Free (estimated):              1.50GiB      (min: 1.50GiB)
      Free (statfs, df):             1.50GiB
      Data ratio:                       1.00
      Metadata ratio:                   1.00
      Global reserve:                3.25MiB      (used: 32.00KiB)
      Multiple profiles:                  no

  Data,single: Size:256.00MiB, Used:0.00B (0.00%)
     /dev/nullb0   256.00MiB

  Metadata,single: Size:256.00MiB, Used:112.00KiB (0.04%)
     /dev/nullb0   256.00MiB

  System,single: Size:256.00MiB, Used:16.00KiB (0.01%)
     /dev/nullb0   256.00MiB

  Unallocated:
     /dev/nullb0     1.25GiB

  # btrfs fi df
  Data, single: total=256.00MiB, used=0.00B, zone_unusable=0.00B
  System, single: total=256.00MiB, used=16.00KiB, zone_unusable=160.00KiB
  Metadata, single: total=256.00MiB, used=112.00KiB, zone_unusable=160.00KiB
  GlobalReserve, single: total=3.25MiB, used=32.00KiB

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-05-07 01:13:14 +02:00
parent a2495d1e6e
commit 780355d225
1 changed files with 17 additions and 0 deletions
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17
cmds/filesystem-usage.c
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@ -431,9 +431,11 @@ static int print_filesystem_usage_overall(int fd, struct chunk_info *chunkinfo,
u64 l_global_reserve_used = 0;
u64 free_estimated = 0;
u64 free_min = 0;
u64 zone_unusable = 0;
double max_data_ratio = 1.0;
int mixed = 0;
struct statfs statfs_buf;
struct btrfs_ioctl_feature_flags feature_flags;
sargs = load_space_info(fd, path);
if (!sargs) {
@ -498,6 +500,16 @@ static int print_filesystem_usage_overall(int fd, struct chunk_info *chunkinfo,
if ((flags & (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA))
== (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA)) {
mixed = 1;
} else {
/*
* As mixed mode is not supported in zoned mode, this
* will account for all profile types
*/
u64 tmp;
tmp = device_get_zone_unusable(fd, flags);
if (tmp != DEVICE_ZONE_UNUSABLE_UNKNOWN)
zone_unusable += tmp;
}
if (flags & BTRFS_BLOCK_GROUP_DATA) {
r_data_used += sargs->spaces[i].used_bytes * ratio;
@ -579,6 +591,11 @@ static int print_filesystem_usage_overall(int fd, struct chunk_info *chunkinfo,
pretty_size_mode(r_total_missing, unit_mode));
printf(" Used:\t\t\t%*s\n", width,
pretty_size_mode(r_total_used, unit_mode));
ret = ioctl(fd, BTRFS_IOC_GET_FEATURES, &feature_flags);
if (ret == 0 && (feature_flags.incompat_flags & BTRFS_FEATURE_INCOMPAT_ZONED)) {
printf(" Device zone unusable:\t%*s\n", width,
pretty_size_mode(zone_unusable, unit_mode));
}
printf(" Free (estimated):\t\t%*s\t(",
width,
pretty_size_mode(free_estimated, unit_mode));