btrfs: fix ->free_chunk_space math in btrfs_shrink_device

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There are two bugs in how we adjust ->free_chunk_space in
btrfs_shrink_device.  First we're removing the entire diff between
new_size and old_size from ->free_chunk_space.  This only works if we're
reducing the free area, which we could potentially not be.  So adjust
the math to only subtract the diff in the free space from
->free_chunk_space.

Additionally in the error case we're unconditionally adding the diff
back into ->free_chunk_space, which we need to only do if this device is
writeable.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2023-09-27 13:46:59 -04:00 • committed by David Sterba

parent efba145449

commit e9fd2c0523

1 changed files with 17 additions and 3 deletions

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fs/btrfs/volumes.c

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