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btrfs: let tree defrag work in SSD mode 

Long time ago (2008) the defrag was automatic for new b-tree writes but
has been disabled after performance problems. There was a leftover in
tree-defrag.c that effectively stops any defragmentation on b-trees.
This is a bit unexpected and IMHO undesired. The SSD mode is an
optimization and defrag is supposed to work if the users asks for it.

Related commits:

6702ed490c
Btrfs: Add run time btree defrag, and an ioctl to force btree defrag

e18e4809b1
Btrfs: Add mount -o ssd, which includes optimizations for seek free
storage

b3236e68bf
Btrfs: Leave on the tree defragger in mount -o ssd, it still helps there

9afbb0b752
Btrfs: Disable tree defrag in SSD mode

The last three commits switch the defrag+ssd off/on/off and the last one

3f157a2fd2
Btrfs: Online btree defragmentation fixes

misses the bits from tree-defrag.c to revert to the behaviour introduced
in e18e4809b1.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2015-04-24 16:44:30 +02:00 committed by Chris Mason
parent 53e489bc8c
commit 13028901a4
1 changed files with 0 additions and 3 deletions
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3
fs/btrfs/tree-defrag.c
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@ -52,9 +52,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
goto out;
if (btrfs_test_opt(root, SSD))
goto out;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;