Messages in this thread | | | Date | Sun, 20 Apr 2008 00:03:12 +0200 | From | Marcin Slusarz <> | Subject | Re: [PATCH 6/8] omfs: add bitmap routines |
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On Sat, Apr 19, 2008 at 04:37:35PM -0400, Bob Copeland wrote: > +unsigned long omfs_count_free(struct super_block *sb) > +{ > + unsigned int i, j; > + u64 *map; > + unsigned long sum = 0; > + struct omfs_sb_info *sbi = OMFS_SB(sb); > + > + for (i = 0; i < sbi->s_imap_size; i++) { > + map = (u64 *) sbi->s_imap[i]; > + for (j = 0; j < sb->s_blocksize / 8; j++) > + sum += hweight64(~map[j]); > + } > + return sum; > +} I think inner loop can be replaced with something like: sum += sb->s_blocksize * 8 - bitmap_weight(map, sb->s_blocksize * 8);
Marcin
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