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| author | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:36:05 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:36:05 +0200 |
| commit | 69ef921b55cc3788d1d2a27b33b27d04acd0090a (patch) | |
| tree | bcc7c1f4b7f15628f122dfdb96f8d4d37f587e92 /fs/xfs/xfs_dir2_block.c | |
| parent | 218106a1104c598011e5df9d9aac7e0416be03e6 (diff) | |
| download | lwn-69ef921b55cc3788d1d2a27b33b27d04acd0090a.tar.gz lwn-69ef921b55cc3788d1d2a27b33b27d04acd0090a.zip | |
xfs: byteswap constants instead of variables
Micro-optimize various comparisms by always byteswapping the constant
instead of the variable, which allows to do the swap at compile instead
of runtime.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs/xfs_dir2_block.c')
| -rw-r--r-- | fs/xfs/xfs_dir2_block.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/fs/xfs/xfs_dir2_block.c b/fs/xfs/xfs_dir2_block.c index c9fdabe5e1ad..70fb0cb6bd69 100644 --- a/fs/xfs/xfs_dir2_block.c +++ b/fs/xfs/xfs_dir2_block.c @@ -109,7 +109,7 @@ xfs_dir2_block_addname( /* * Check the magic number, corrupted if wrong. */ - if (unlikely(be32_to_cpu(hdr->magic) != XFS_DIR2_BLOCK_MAGIC)) { + if (unlikely(hdr->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))) { XFS_CORRUPTION_ERROR("xfs_dir2_block_addname", XFS_ERRLEVEL_LOW, mp, hdr); xfs_da_brelse(tp, bp); @@ -255,7 +255,8 @@ xfs_dir2_block_addname( highstale = lfloghigh = -1; fromidx >= 0; fromidx--) { - if (be32_to_cpu(blp[fromidx].address) == XFS_DIR2_NULL_DATAPTR) { + if (blp[fromidx].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) { if (highstale == -1) highstale = toidx; else { @@ -352,12 +353,14 @@ xfs_dir2_block_addname( else { for (lowstale = mid; lowstale >= 0 && - be32_to_cpu(blp[lowstale].address) != XFS_DIR2_NULL_DATAPTR; + blp[lowstale].address != + cpu_to_be32(XFS_DIR2_NULL_DATAPTR); lowstale--) continue; for (highstale = mid + 1; highstale < be32_to_cpu(btp->count) && - be32_to_cpu(blp[highstale].address) != XFS_DIR2_NULL_DATAPTR && + blp[highstale].address != + cpu_to_be32(XFS_DIR2_NULL_DATAPTR) && (lowstale < 0 || mid - lowstale > highstale - mid); highstale++) continue; @@ -899,7 +902,7 @@ xfs_dir2_leaf_to_block( tp = args->trans; mp = dp->i_mount; leaf = lbp->data; - ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC); + ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC)); ltp = xfs_dir2_leaf_tail_p(mp, leaf); /* * If there are data blocks other than the first one, take this @@ -929,7 +932,7 @@ xfs_dir2_leaf_to_block( goto out; } hdr = dbp->data; - ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC); + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)); /* * Size of the "leaf" area in the block. */ @@ -971,7 +974,8 @@ xfs_dir2_leaf_to_block( */ lep = xfs_dir2_block_leaf_p(btp); for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) { - if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR) + if (leaf->ents[from].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) continue; lep[to++] = leaf->ents[from]; } |