btrfs-progs: check: lowmem: introduce avoid_extents_overwrite

Declare a global u64 variable last_allocated_chunk records start of
the last chunk allocated by lowmem repair.
Although global variable is not nice, it simplifies the code a lot.

avoid_extents_overwrite() prefers to allocate a new chunk first.
If it failed because of no space or wrong used bytes (like in
fsck-tests/004), then it tries to exclude metadata blocks which costs
a lot of time in large filesystems.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions