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authorBadari Pulavarty <pbadari@us.ibm.com>2007-07-15 23:42:00 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:52 -0700
commit5e70030d4cf91613530a23b40ad9919bb9ee114f (patch)
tree30a53102b73179840cac06ed325ece645585a566 /include/linux/ext4_fs_sb.h
parenta71ce8c6c9bf269b192f352ea555217815cf027e (diff)
downloadop-kernel-dev-5e70030d4cf91613530a23b40ad9919bb9ee114f.zip
op-kernel-dev-5e70030d4cf91613530a23b40ad9919bb9ee114f.tar.gz
ext4: 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>
Diffstat (limited to 'include/linux/ext4_fs_sb.h')
-rw-r--r--include/linux/ext4_fs_sb.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ext4_fs_sb.h b/include/linux/ext4_fs_sb.h
index 691a713..2347557 100644
--- a/include/linux/ext4_fs_sb.h
+++ b/include/linux/ext4_fs_sb.h
@@ -39,6 +39,8 @@ struct ext4_sb_info {
unsigned long s_gdb_count; /* Number of group descriptor blocks */
unsigned long s_desc_per_block; /* Number of group descriptors per block */
unsigned long s_groups_count; /* Number of groups in the fs */
+ unsigned long s_overhead_last; /* Last calculated overhead */
+ unsigned long s_blocks_last; /* Last seen block count */
struct buffer_head * s_sbh; /* Buffer containing the super block */
struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
struct buffer_head ** s_group_desc;
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