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btrfs-progs: fi df: report zone_unusable on zoned filesystem

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In the zoned mode there are parts of chunks that become unusable once
they get COWed and the zone must be reclaimed and reset to make the
space usable again. Provide a way to show the total size per block group
type in fi df:

  $ btrfs fi df .
  Data, single: total=1.00GiB, used=257.51MiB, zone_unusable=238.43MiB
  System, single: total=256.00MiB, used=16.00KiB, zone_unusable=224.00KiB
  Metadata, single: total=256.00MiB, used=816.00KiB, zone_unusable=8.61MiB
  GlobalReserve, single: total=3.25MiB, used=0.00B

This will not be shown on non-zoned filesystems.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-05-06 16:45:41 +02:00
parent e15526653d
commit e295a8ad4c
1 changed files with 45 additions and 4 deletions
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49
cmds/filesystem.c
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@ -66,17 +66,58 @@ static const char * const cmd_filesystem_df_usage[] = {
NULL
};
static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
#define ZONE_UNUSABLE_UNKNOWN ((u64)-1)
/*
* Read value of zone_unusable from sysfs for given block group type in flags
*/
static u64 get_zone_unusable(int fd, u64 flags)
{
char buf[64];
int sys_fd;
u64 unusable = ZONE_UNUSABLE_UNKNOWN;
/* Don't report it for a regular fs */
sys_fd = sysfs_open_fsid_file(fd, "features/zoned");
if (sys_fd < 0)
return ZONE_UNUSABLE_UNKNOWN;
close(sys_fd);
sys_fd = -1;
if ((flags & BTRFS_BLOCK_GROUP_DATA) == BTRFS_BLOCK_GROUP_DATA)
sys_fd = sysfs_open_fsid_file(fd, "allocation/data/bytes_zone_unusable");
else if ((flags & BTRFS_BLOCK_GROUP_METADATA) == BTRFS_BLOCK_GROUP_METADATA)
sys_fd = sysfs_open_fsid_file(fd, "allocation/metadata/bytes_zone_unusable");
else if ((flags & BTRFS_BLOCK_GROUP_SYSTEM) == BTRFS_BLOCK_GROUP_SYSTEM)
sys_fd = sysfs_open_fsid_file(fd, "allocation/system/bytes_zone_unusable");
if (sys_fd < 0)
return ZONE_UNUSABLE_UNKNOWN;
sysfs_read_file(sys_fd, buf, sizeof(buf));
unusable = strtoull(buf, NULL, 10);
close(sys_fd);
return unusable;
}
static void print_df(int fd, struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
{
u64 i;
struct btrfs_ioctl_space_info *sp = sargs->spaces;
u64 unusable;
bool ok;
for (i = 0; i < sargs->total_spaces; i++, sp++) {
printf("%s, %s: total=%s, used=%s\n",
unusable = get_zone_unusable(fd, sp->flags);
ok = (unusable != ZONE_UNUSABLE_UNKNOWN);
printf("%s, %s: total=%s, used=%s%s%s\n",
btrfs_group_type_str(sp->flags),
btrfs_group_profile_str(sp->flags),
pretty_size_mode(sp->total_bytes, unit_mode),
pretty_size_mode(sp->used_bytes, unit_mode));
pretty_size_mode(sp->used_bytes, unit_mode),
(ok ? ", zone_unusable=" : ""),
(ok ? pretty_size_mode(unusable, unit_mode) : ""));
}
}
@ -106,7 +147,7 @@ static int cmd_filesystem_df(const struct cmd_struct *cmd,
ret = get_df(fd, &sargs);
if (ret == 0) {
print_df(sargs, unit_mode);
print_df(fd, sargs, unit_mode);
free(sargs);
} else {
errno = -ret;