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GFS2: introduce bi_blocks for optimization 

This patch introduces a new field in the bitmap structure called
bi_blocks. Its purpose is to save us from constantly multiplying
bi_len by the constant GFS2_NBBY. It also paves the way for more
optimization in a future patch.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2013-09-11 13:44:02 -05:00 committed by Steven Whitehouse
parent 6aa7640f30
commit 7e230f5774
2 changed files with 6 additions and 1 deletions
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1
fs/gfs2/incore.h
View File

@ -71,6 +71,7 @@ struct gfs2_bitmap {
u32 bi_offset;
u32 bi_start;
u32 bi_len;
u32 bi_blocks;
};
struct gfs2_rgrpd {

6
fs/gfs2/rgrp.c
View File

@ -262,7 +262,7 @@ static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
rbm->bi = rbm->rgd->rd_bits;
rbm->offset = (u32)(rblock);
/* Check if the block is within the first block */
if (rbm->offset < rbm->bi->bi_len * GFS2_NBBY)
if (rbm->offset < rbm->bi->bi_blocks)
return 0;
/* Adjust for the size diff between gfs2_meta_header and gfs2_rgrp */
@ -743,18 +743,21 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd)
bi->bi_offset = sizeof(struct gfs2_rgrp);
bi->bi_start = 0;
bi->bi_len = bytes;
bi->bi_blocks = bytes * GFS2_NBBY;
/* header block */
} else if (x == 0) {
bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
bi->bi_offset = sizeof(struct gfs2_rgrp);
bi->bi_start = 0;
bi->bi_len = bytes;
bi->bi_blocks = bytes * GFS2_NBBY;
/* last block */
} else if (x + 1 == length) {
bytes = bytes_left;
bi->bi_offset = sizeof(struct gfs2_meta_header);
bi->bi_start = rgd->rd_bitbytes - bytes_left;
bi->bi_len = bytes;
bi->bi_blocks = bytes * GFS2_NBBY;
/* other blocks */
} else {
bytes = sdp->sd_sb.sb_bsize -
@ -762,6 +765,7 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd)
bi->bi_offset = sizeof(struct gfs2_meta_header);
bi->bi_start = rgd->rd_bitbytes - bytes_left;
bi->bi_len = bytes;
bi->bi_blocks = bytes * GFS2_NBBY;
}
bytes_left -= bytes;