tree 7338c64a5431e65a5fa27b0df0c7f6e2baf0b884
parent 5f2cc086ccab27ac5252b3883ac004347860b4c7
author Chris Mason <chris.mason@oracle.com> 1226319993 -0500
committer Chris Mason <chris.mason@oracle.com> 1226319993 -0500

Btrfs: Don't substract too much from the allocation target (avoid wrapping)

When metadata allocation clustering has to fall back to unclustered
allocs because large free areas could not be found, it was sometimes
substracting too much from the total bytes to allocate.  This would
make it wrap below zero.

Signed-off-by: Chris Mason <chris.mason@oracle.com>