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btrfs: make block group flags in balance printks human-readable

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They're not even documented anywhere, letting users with no recourse but
to RTFS.  It's no big burden to output the bitfield as words.

Also, display unknown flags as hex.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Adam Borowski 2016-11-14 18:44:34 +01:00 committed by David Sterba
parent 8e2bd3b7fa
commit ebce0e01b9
1 changed files with 40 additions and 3 deletions
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43
fs/btrfs/relocation.c
View file

@ -4332,6 +4332,45 @@ static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
return rc;
}
/*
* Print the block group being relocated
*/
static void describe_relocation(struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group)
{
char buf[128]; /* prefixed by a '|' that'll be dropped */
u64 flags = block_group->flags;
/* Shouldn't happen */
if (!flags) {
strcpy(buf, "|NONE");
} else {
char *bp = buf;
#define DESCRIBE_FLAG(f, d) \
if (flags & BTRFS_BLOCK_GROUP_##f) { \
bp += snprintf(bp, buf - bp + sizeof(buf), "|%s", d); \
flags &= ~BTRFS_BLOCK_GROUP_##f; \
}
DESCRIBE_FLAG(DATA, "data");
DESCRIBE_FLAG(SYSTEM, "system");
DESCRIBE_FLAG(METADATA, "metadata");
DESCRIBE_FLAG(RAID0, "raid0");
DESCRIBE_FLAG(RAID1, "raid1");
DESCRIBE_FLAG(DUP, "dup");
DESCRIBE_FLAG(RAID10, "raid10");
DESCRIBE_FLAG(RAID5, "raid5");
DESCRIBE_FLAG(RAID6, "raid6");
if (flags)
snprintf(buf, buf - bp + sizeof(buf), "|0x%llx", flags);
#undef DESCRIBE_FLAG
}
btrfs_info(fs_info,
"relocating block group %llu flags %s",
block_group->key.objectid, buf + 1);
}
/*
* function to relocate all extents in a block group.
*/
@ -4388,9 +4427,7 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
goto out;
}
btrfs_info(extent_root->fs_info,
"relocating block group %llu flags %llu",
rc->block_group->key.objectid, rc->block_group->flags);
describe_relocation(extent_root->fs_info, rc->block_group);
btrfs_wait_block_group_reservations(rc->block_group);
btrfs_wait_nocow_writers(rc->block_group);