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xfs: byteswap constants instead of variables

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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>
This commit is contained in:
Christoph Hellwig
2011-07-08 14:36:05 +02:00
parent 218106a110
commit 69ef921b55
15 changed files with 208 additions and 197 deletions
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19
fs/xfs/xfs_attr.c
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@@ -1203,7 +1203,7 @@ xfs_attr_leaf_list(xfs_attr_list_context_t *context)
return XFS_ERROR(error);
ASSERT(bp != NULL);
leaf = bp->data;
if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);
xfs_da_brelse(NULL, bp);
@@ -1610,9 +1610,8 @@ xfs_attr_node_removename(xfs_da_args_t *args)
XFS_ATTR_FORK);
if (error)
goto out;
ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
bp->data)->hdr.info.magic)
== XFS_ATTR_LEAF_MAGIC);
ASSERT((((xfs_attr_leafblock_t *)bp->data)->hdr.info.magic) ==
cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
xfs_bmap_init(args->flist, args->firstblock);
@@ -1877,11 +1876,11 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
return(XFS_ERROR(EFSCORRUPTED));
}
node = bp->data;
if (be16_to_cpu(node->hdr.info.magic)
== XFS_ATTR_LEAF_MAGIC)
if (node->hdr.info.magic ==
cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
break;
if (unlikely(be16_to_cpu(node->hdr.info.magic)
!= XFS_DA_NODE_MAGIC)) {
if (unlikely(node->hdr.info.magic !=
cpu_to_be16(XFS_DA_NODE_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount,
@@ -1916,8 +1915,8 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
*/
for (;;) {
leaf = bp->data;
if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
!= XFS_ATTR_LEAF_MAGIC)) {
if (unlikely(leaf->hdr.info.magic !=
cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);