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btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE

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The name BTRFS_ROOT_REF_COWS is not very clear about the meaning.

In fact, that bit can only be set to those trees:

- Subvolume roots
- Data reloc root
- Reloc roots for above roots

All other trees won't get this bit set.  So just by the result, it is
obvious that, roots with this bit set can have tree blocks shared with
other trees.  Either shared by snapshots, or by reloc roots (an special
snapshot created by relocation).

This patch will rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE to
make it easier to understand, and update all comment mentioning
"reference counted" to follow the rename.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
2020-05-15 14:01:40 +08:00
committed by David Sterba
parent ae3e715f85
commit 92a7cc4252
13 changed files with 81 additions and 55 deletions
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2
fs/btrfs/block-rsv.c
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@ -458,7 +458,7 @@ static struct btrfs_block_rsv *get_block_rsv(
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_block_rsv *block_rsv = NULL;
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state) ||
(root == fs_info->csum_root && trans->adding_csums) ||
(root == fs_info->uuid_root))
block_rsv = trans->block_rsv;