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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-01-08 15:32:41 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-08 16:10:35 -0800
commit9f966be8996f2829406324c68e4c67c2d64d864b (patch)
tree40b2e1f12834498f1e7d8240fe7f6f3dbaf0dce2 /fs/buffer.c
parentd52df2e2ea2d881b1439bbdec7f67c27e0f47941 (diff)
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>
Diffstat (limited to 'fs/buffer.c')
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