OGAWA Hirofumi 9f966be899 fat: optimize fat_count_free_clusters() ... On large partition, scanning the free clusters is very slow if users doesn't use "usefree" option. For optimizing it, this patch uses sb_breadahead() to read of FAT sectors. On some user's 15GB partition, this patch improved it very much (1min => 600ms). The following is the result of 2GB partition on my machine. without patch: root@devron (/)# time df -h > /dev/null real 0m1.202s user 0m0.000s sys 0m0.440s with patch: root@devron (/)# time df -h > /dev/null real 0m0.378s user 0m0.012s sys 0m0.168s Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-01-08 16:10:35 -08:00
..
cache.c	Slab API: remove useless ctor parameter and reorder parameters	2007-10-17 08:42:45 -07:00
dir.c	fat: gcc 4.3 warning fix	2007-07-16 09:05:42 -07:00
fatent.c	fat: optimize fat_count_free_clusters()	2008-01-08 16:10:35 -08:00
file.c	sendfile: remove .sendfile from filesystems that use generic_file_sendfile()	2007-07-10 08:04:13 +02:00
inode.c	exportfs: make struct export_operations const	2007-10-22 08:13:21 -07:00
Makefile
misc.c	[PATCH] fs/fat/misc.c: unexport fat_sync_bhs	2006-06-23 07:43:03 -07:00