From: Alex Tomas Date: Fri, 24 Mar 2006 11:16:16 +0000 (-0800) Subject: [PATCH] fast ext3_statfs X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=09fe316a7b10219be592118626850e1dfdfcc1aa;p=linux-beck.git [PATCH] fast ext3_statfs Under I/O load it may take up to a dozen seconds to read all group descriptors. This is what ext3_statfs() does. At the same time, we already maintain global numbers of free inodes/blocks. Why don't we use them instead of group reading and summing? Cc: Ravikiran G Thirumalai Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ext3/super.c b/fs/ext3/super.c index a3e2a8e7dca2..86e443182de4 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -2326,7 +2326,8 @@ restore_opts: static int ext3_statfs (struct super_block * sb, struct kstatfs * buf) { - struct ext3_super_block *es = EXT3_SB(sb)->s_es; + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; unsigned long overhead; int i; @@ -2368,12 +2369,12 @@ static int ext3_statfs (struct super_block * sb, struct kstatfs * buf) buf->f_type = EXT3_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; - buf->f_bfree = ext3_count_free_blocks (sb); + buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter); buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) buf->f_bavail = 0; buf->f_files = le32_to_cpu(es->s_inodes_count); - buf->f_ffree = ext3_count_free_inodes (sb); + buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter); buf->f_namelen = EXT3_NAME_LEN; return 0; }