From: David Sterba Date: Fri, 24 Apr 2015 14:44:30 +0000 (+0200) Subject: btrfs: let tree defrag work in SSD mode X-Git-Tag: omap-for-v4.2/fixes-rc1^2~69^2~58 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13028901a4a62096e97a0fc44388ea859587f690;p=pandora-kernel.git 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: 6702ed490ca0bb44e17131818a5a18b773957c5a Btrfs: Add run time btree defrag, and an ioctl to force btree defrag e18e4809b10e6c9efb5fe10c1ddcb4ebb690d517 Btrfs: Add mount -o ssd, which includes optimizations for seek free storage b3236e68bf86b3ae87f58984a1822369225211cb Btrfs: Leave on the tree defragger in mount -o ssd, it still helps there 9afbb0b752ef30a429c45b9de6706e28ad1a36e1 Btrfs: Disable tree defrag in SSD mode The last three commits switch the defrag+ssd off/on/off and the last one 3f157a2fd2ad731e1ed9964fecdc5f459f04a4a4 Btrfs: Online btree defragmentation fixes misses the bits from tree-defrag.c to revert to the behaviour introduced in e18e4809b10e. Signed-off-by: David Sterba Signed-off-by: Chris Mason --- Reading git-diff-tree failed