[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 <kiran@scalex86.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -2326,7 +2326,8 @@ restore_opts:
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static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
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{
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struct ext3_super_block *es = EXT3_SB(sb)->s_es;
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struct ext3_sb_info *sbi = EXT3_SB(sb);
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struct ext3_super_block *es = sbi->s_es;
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unsigned long overhead;
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int i;
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@ -2368,12 +2369,12 @@ static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
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buf->f_type = EXT3_SUPER_MAGIC;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
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buf->f_bfree = ext3_count_free_blocks (sb);
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buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
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buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
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if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
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buf->f_bavail = 0;
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buf->f_files = le32_to_cpu(es->s_inodes_count);
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buf->f_ffree = ext3_count_free_inodes (sb);
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buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
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buf->f_namelen = EXT3_NAME_LEN;
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return 0;
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}
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