xfs: only free posteof blocks on first close

Certain workloads fragment files on XFS very badly, such as a software
package that creates a number of threads, each of which repeatedly run
the sequence: open a file, perform a synchronous write, and close the
file, which defeats the speculative preallocation mechanism.  We work
around this problem by only deleting posteof blocks the /first/ time a
file is closed to preserve the behavior that unpacking a tarball lays
out files one after the other with no gaps.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

0 files changed, 0 insertions, 0 deletions