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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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20
fs/xfs/xfs_log_recover.c
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@@ -300,14 +300,14 @@ xlog_header_check_recover(
xfs_mount_t *mp,
xlog_rec_header_t *head)
{
ASSERT(be32_to_cpu(head->h_magicno) == XLOG_HEADER_MAGIC_NUM);
ASSERT(head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM));
/*
* IRIX doesn't write the h_fmt field and leaves it zeroed
* (XLOG_FMT_UNKNOWN). This stops us from trying to recover
* a dirty log created in IRIX.
*/
if (unlikely(be32_to_cpu(head->h_fmt) != XLOG_FMT)) {
if (unlikely(head->h_fmt != cpu_to_be32(XLOG_FMT))) {
xfs_warn(mp,
"dirty log written in incompatible format - can't recover");
xlog_header_check_dump(mp, head);
@@ -333,7 +333,7 @@ xlog_header_check_mount(
xfs_mount_t *mp,
xlog_rec_header_t *head)
{
ASSERT(be32_to_cpu(head->h_magicno) == XLOG_HEADER_MAGIC_NUM);
ASSERT(head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM));
if (uuid_is_nil(&head->h_fs_uuid)) {
/*
@@ -534,7 +534,7 @@ xlog_find_verify_log_record(
head = (xlog_rec_header_t *)offset;
if (XLOG_HEADER_MAGIC_NUM == be32_to_cpu(head->h_magicno))
if (head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
break;
if (!smallmem)
@@ -916,7 +916,7 @@ xlog_find_tail(
if (error)
goto done;
if (XLOG_HEADER_MAGIC_NUM == be32_to_cpu(*(__be32 *)offset)) {
if (*(__be32 *)offset == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
found = 1;
break;
}
@@ -933,8 +933,8 @@ xlog_find_tail(
if (error)
goto done;
if (XLOG_HEADER_MAGIC_NUM ==
be32_to_cpu(*(__be32 *)offset)) {
if (*(__be32 *)offset ==
cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
found = 2;
break;
}
@@ -1947,7 +1947,7 @@ xfs_qm_dqcheck(
* This is all fine; things are still consistent, and we haven't lost
* any quota information. Just don't complain about bad dquot blks.
*/
if (be16_to_cpu(ddq->d_magic) != XFS_DQUOT_MAGIC) {
if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) {
if (flags & XFS_QMOPT_DOWARN)
xfs_alert(mp,
"%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x",
@@ -2238,7 +2238,7 @@ xlog_recover_inode_pass2(
* Make sure the place we're flushing out to really looks
* like an inode!
*/
if (unlikely(be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC)) {
if (unlikely(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))) {
xfs_buf_relse(bp);
xfs_alert(mp,
"%s: Bad inode magic number, dip = 0x%p, dino bp = 0x%p, ino = %Ld",
@@ -3295,7 +3295,7 @@ xlog_valid_rec_header(
{
int hlen;
if (unlikely(be32_to_cpu(rhead->h_magicno) != XLOG_HEADER_MAGIC_NUM)) {
if (unlikely(rhead->h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM))) {
XFS_ERROR_REPORT("xlog_valid_rec_header(1)",
XFS_ERRLEVEL_LOW, log->l_mp);
return XFS_ERROR(EFSCORRUPTED);