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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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47
fs/xfs/xfs_dir2_data.c
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@@ -73,7 +73,7 @@ xfs_dir2_data_check(
bf = hdr->bestfree;
p = (char *)(hdr + 1);
if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) {
btp = xfs_dir2_block_tail_p(mp, hdr);
lep = xfs_dir2_block_leaf_p(btp);
endp = (char *)lep;
@@ -140,7 +140,7 @@ xfs_dir2_data_check(
(char *)dep - (char *)hdr);
count++;
lastfree = 0;
if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) {
addr = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
(xfs_dir2_data_aoff_t)
((char *)dep - (char *)hdr));
@@ -160,9 +160,10 @@ xfs_dir2_data_check(
* Need to have seen all the entries and all the bestfree slots.
*/
ASSERT(freeseen == 7);
if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) {
for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
if (be32_to_cpu(lep[i].address) == XFS_DIR2_NULL_DATAPTR)
if (lep[i].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
if (i > 0)
ASSERT(be32_to_cpu(lep[i].hashval) >= be32_to_cpu(lep[i - 1].hashval));
@@ -196,8 +197,8 @@ xfs_dir2_data_freefind(
* Check order, non-overlapping entries, and if we find the
* one we're looking for it has to be exact.
*/
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
for (dfp = &hdr->bestfree[0], seenzero = matched = 0;
dfp < &hdr->bestfree[XFS_DIR2_DATA_FD_COUNT];
dfp++) {
@@ -256,8 +257,8 @@ xfs_dir2_data_freeinsert(
xfs_dir2_data_free_t new; /* new bestfree entry */
#ifdef __KERNEL__
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
#endif
dfp = hdr->bestfree;
new.length = dup->length;
@@ -297,8 +298,8 @@ xfs_dir2_data_freeremove(
int *loghead) /* out: log data header */
{
#ifdef __KERNEL__
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
#endif
/*
* It's the first entry, slide the next 2 up.
@@ -341,8 +342,8 @@ xfs_dir2_data_freescan(
char *p; /* current entry pointer */
#ifdef __KERNEL__
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
#endif
/*
* Start by clearing the table.
@@ -353,7 +354,7 @@ xfs_dir2_data_freescan(
* Set up pointers.
*/
p = (char *)(hdr + 1);
if (be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC) {
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) {
btp = xfs_dir2_block_tail_p(mp, hdr);
endp = (char *)xfs_dir2_block_leaf_p(btp);
} else
@@ -458,8 +459,8 @@ xfs_dir2_data_log_entry(
{
xfs_dir2_data_hdr_t *hdr = bp->data;
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
xfs_da_log_buf(tp, bp, (uint)((char *)dep - (char *)hdr),
(uint)((char *)(xfs_dir2_data_entry_tag_p(dep) + 1) -
@@ -476,8 +477,8 @@ xfs_dir2_data_log_header(
{
xfs_dir2_data_hdr_t *hdr = bp->data;
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
xfs_da_log_buf(tp, bp, 0, sizeof(*hdr) - 1);
}
@@ -493,8 +494,8 @@ xfs_dir2_data_log_unused(
{
xfs_dir2_data_hdr_t *hdr = bp->data;
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
/*
* Log the first part of the unused entry.
@@ -539,12 +540,12 @@ xfs_dir2_data_make_free(
/*
* Figure out where the end of the data area is.
*/
if (be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC)
if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC))
endptr = (char *)hdr + mp->m_dirblksize;
else {
xfs_dir2_block_tail_t *btp; /* block tail */
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
btp = xfs_dir2_block_tail_p(mp, hdr);
endptr = (char *)xfs_dir2_block_leaf_p(btp);
}
@@ -717,8 +718,8 @@ xfs_dir2_data_use_free(
int oldlen; /* old unused entry's length */
hdr = bp->data;
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC ||
be32_to_cpu(hdr->magic) == XFS_DIR2_BLOCK_MAGIC);
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC));
ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG);
ASSERT(offset >= (char *)dup - (char *)hdr);
ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr);