tree 32d1c37b890120e0eb12c2f4fe821af5507aad91
parent 2235219b7721b8e74de6841e79240936561a2b63
author Badari Pulavarty <pbadari@us.ibm.com> 1184568119 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1184601952 -0700

ext3: statfs speed up

This is a patch that speeds up statfs.  It is very simple - the "overhead"
calculation, which takes a huge amount of time for large filesystems, never
changes unless the size of the filesystem itself changes.  That means we can
store it in memory and only recalculate if the filesystem has been resized
(almost never).

It also fixes a minor problem that we never update the on-disk superblock free
blocks/inodes counts until the filesystem is unmounted.  While not fatal, we
may as well update that on disk when we have the information, and it makes
things like debugfs and dumpe2fs report a bit more accurate info.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>