tree 12bcb989f0e210f25770a72441eb8b947fd2fad3
parent 4edc2ca388d62abffe38149f6ac00e749ea721c5
author Josef Bacik <josef@redhat.com> 1334261037 -0400
committer Chris Mason <chris.mason@oracle.com> 1334278441 -0400

Btrfs: use commit root when loading free space cache

A user reported that booting his box up with btrfs root on 3.4 was way
slower than on 3.3 because I removed the ideal caching code.  It turns out
that we don't load the free space cache if we're in a commit for deadlock
reasons, but since we're reading the cache and it hasn't changed yet we are
safe reading the inode and free space item from the commit root, so do that
and remove all of the deadlock checks so we don't unnecessarily skip loading
the free space cache.  The user reported this fixed the slowness.  Thanks,

Tested-by: Calvin Walton <calvin.walton@kepstin.ca>
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>