[XFS] clean up some xfs_log_priv.h macros

- the various assign lsn macros are replaced by a single inline,
xlog_assign_lsn, which is equivalent to ASSIGN_ANY_LSN_HOST except
for a more sane calling convention. ASSIGN_LSN_DISK is replaced
by xlog_assign_lsn and a manual bytespap, and ASSIGN_LSN by the same,
except we pass the cycle and block arguments explicitly instead of a
log paramter. The latter two variants only had 2, respectively one
user anyway.
- the GET_CYCLE is replaced by a xlog_get_cycle inline with exactly the
same calling conventions.
- GET_CLIENT_ID is replaced by xlog_get_client_id which leaves away
the unused arch argument. Instead of conditional defintions
depending on host endianess we now do an unconditional swap and shift
then, which generates equal code.
- the unused XLOG_SET macro is removed.

SGI-PV: 971186
SGI-Modid: xfs-linux-melb:xfs-kern:29819a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

3 files changed, 40 insertions, 50 deletions

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 615638201284..90d96caf7200 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1161,7 +1161,7 @@ xlog_alloc_log(xfs_mount_t	*mp,
         log->l_flags       |= XLOG_ACTIVE_RECOVERY;
 
         log->l_prev_block  = -1;
-        ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0);
+        log->l_tail_lsn    = xlog_assign_lsn(1, 0);
         /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
         log->l_last_sync_lsn = log->l_tail_lsn;
         log->l_curr_cycle  = 1;     /* 0 is bad since this is initial value */
@@ -1326,8 +1326,7 @@ xlog_grant_push_ail(xfs_mount_t	*mp,
             threshold_block -= log->l_logBBsize;
             threshold_cycle += 1;
         }
-        ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle,
-                       threshold_block);
+        threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block);
 
         /* Don't pass in an lsn greater than the lsn of the last
          * log record known to be on disk.
@@ -2393,7 +2392,8 @@ restart:
                                     log->l_iclog_hsize,
                                     XLOG_REG_TYPE_LRHEADER);
                 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle);
-                ASSIGN_LSN(head->h_lsn, log);
+                INT_SET(head->h_lsn, ARCH_CONVERT,
+                        xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block));
                 ASSERT(log->l_curr_block >= 0);
         }
 
@@ -3488,9 +3488,11 @@ xlog_verify_iclog(xlog_t	 *log,
                         if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
                                 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
                                 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
-                                clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT);
+                                clientid = xlog_get_client_id(
+                                        xhdr[j].hic_xheader.xh_cycle_data[k]);
                         } else {
-                                clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT);
+                                clientid = xlog_get_client_id(
+                                        iclog->ic_header.h_cycle_data[idx]);
                         }
                 }
                 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 07da6a72628a..e391f58deae1 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -55,32 +55,21 @@ struct xfs_mount;
         BTOBB(XLOG_MAX_ICLOGS << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \
          XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
 
-/*
- *  set lsns
- */
 
-#define ASSIGN_ANY_LSN_HOST(lsn,cycle,block)  \
-    { \
-        (lsn) = ((xfs_lsn_t)(cycle)<<32)|(block); \
-    }
-#define ASSIGN_ANY_LSN_DISK(lsn,cycle,block)  \
-    { \
-        INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \
-        INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \
-    }
-#define ASSIGN_LSN(lsn,log) \
-    ASSIGN_ANY_LSN_DISK(lsn,(log)->l_curr_cycle,(log)->l_curr_block);
-
-#define XLOG_SET(f,b)           (((f) & (b)) == (b))
-
-#define GET_CYCLE(ptr, arch) \
-    (INT_GET(*(uint *)(ptr), arch) == XLOG_HEADER_MAGIC_NUM ? \
-         INT_GET(*((uint *)(ptr)+1), arch) : \
-         INT_GET(*(uint *)(ptr), arch) \
-    )
+static inline xfs_lsn_t xlog_assign_lsn(uint cycle, uint block)
+{
+        return ((xfs_lsn_t)cycle << 32) | block;
+}
 
-#define BLK_AVG(blk1, blk2)     ((blk1+blk2) >> 1)
+static inline uint xlog_get_cycle(char *ptr)
+{
+        if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM)
+                return INT_GET(*((uint *)ptr + 1), ARCH_CONVERT);
+        else
+                return INT_GET(*(uint *)ptr, ARCH_CONVERT);
+}
 
+#define BLK_AVG(blk1, blk2)     ((blk1+blk2) >> 1)
 
 #ifdef __KERNEL__
 
@@ -96,14 +85,10 @@ struct xfs_mount;
  *
  * this has endian issues, of course.
  */
-
-#ifndef XFS_NATIVE_HOST
-#define GET_CLIENT_ID(i,arch) \
-    ((i) & 0xff)
-#else
-#define GET_CLIENT_ID(i,arch) \
-    ((i) >> 24)
-#endif
+static inline uint xlog_get_client_id(uint i)
+{
+        return INT_GET(i, ARCH_CONVERT) >> 24;
+}
 
 #define xlog_panic(args...)     cmn_err(CE_PANIC, ## args)
 #define xlog_exit(args...)      cmn_err(CE_PANIC, ## args)
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 4c39dc0e6841..e603591b9922 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -311,7 +311,7 @@ xlog_find_cycle_start(
                 if ((error = xlog_bread(log, mid_blk, 1, bp)))
                         return error;
                 offset = xlog_align(log, mid_blk, 1, bp);
-                mid_cycle = GET_CYCLE(offset, ARCH_CONVERT);
+                mid_cycle = xlog_get_cycle(offset);
                 if (mid_cycle == cycle) {
                         *last_blk = mid_blk;
                         /* last_half_cycle == mid_cycle */
@@ -371,7 +371,7 @@ xlog_find_verify_cycle(
 
                 buf = xlog_align(log, i, bcount, bp);
                 for (j = 0; j < bcount; j++) {
-                        cycle = GET_CYCLE(buf, ARCH_CONVERT);
+                        cycle = xlog_get_cycle(buf);
                         if (cycle == stop_on_cycle_no) {
                                 *new_blk = i+j;
                                 goto out;
@@ -550,13 +550,13 @@ xlog_find_head(
         if ((error = xlog_bread(log, 0, 1, bp)))
                 goto bp_err;
         offset = xlog_align(log, 0, 1, bp);
-        first_half_cycle = GET_CYCLE(offset, ARCH_CONVERT);
+        first_half_cycle = xlog_get_cycle(offset);
 
         last_blk = head_blk = log_bbnum - 1;    /* get cycle # of last block */
         if ((error = xlog_bread(log, last_blk, 1, bp)))
                 goto bp_err;
         offset = xlog_align(log, last_blk, 1, bp);
-        last_half_cycle = GET_CYCLE(offset, ARCH_CONVERT);
+        last_half_cycle = xlog_get_cycle(offset);
         ASSERT(last_half_cycle != 0);
 
         /*
@@ -808,7 +808,7 @@ xlog_find_tail(
                 if ((error = xlog_bread(log, 0, 1, bp)))
                         goto bread_err;
                 offset = xlog_align(log, 0, 1, bp);
-                if (GET_CYCLE(offset, ARCH_CONVERT) == 0) {
+                if (xlog_get_cycle(offset) == 0) {
                         *tail_blk = 0;
                         /* leave all other log inited values alone */
                         goto exit;
@@ -922,10 +922,12 @@ xlog_find_tail(
                          * log records will point recovery to after the
                          * current unmount record.
                          */
-                        ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, log->l_curr_cycle,
-                                        after_umount_blk);
-                        ASSIGN_ANY_LSN_HOST(log->l_last_sync_lsn, log->l_curr_cycle,
-                                        after_umount_blk);
+                        log->l_tail_lsn =
+                                xlog_assign_lsn(log->l_curr_cycle,
+                                                after_umount_blk);
+                        log->l_last_sync_lsn =
+                                xlog_assign_lsn(log->l_curr_cycle,
+                                                after_umount_blk);
                         *tail_blk = after_umount_blk;
 
                         /*
@@ -1007,7 +1009,7 @@ xlog_find_zeroed(
         if ((error = xlog_bread(log, 0, 1, bp)))
                 goto bp_err;
         offset = xlog_align(log, 0, 1, bp);
-        first_cycle = GET_CYCLE(offset, ARCH_CONVERT);
+        first_cycle = xlog_get_cycle(offset);
         if (first_cycle == 0) {         /* completely zeroed log */
                 *blk_no = 0;
                 xlog_put_bp(bp);
@@ -1018,7 +1020,7 @@ xlog_find_zeroed(
         if ((error = xlog_bread(log, log_bbnum-1, 1, bp)))
                 goto bp_err;
         offset = xlog_align(log, log_bbnum-1, 1, bp);
-        last_cycle = GET_CYCLE(offset, ARCH_CONVERT);
+        last_cycle = xlog_get_cycle(offset);
         if (last_cycle != 0) {          /* log completely written to */
                 xlog_put_bp(bp);
                 return 0;
@@ -1102,8 +1104,9 @@ xlog_add_record(
         INT_SET(recp->h_cycle, ARCH_CONVERT, cycle);
         INT_SET(recp->h_version, ARCH_CONVERT,
                         XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1);
-        ASSIGN_ANY_LSN_DISK(recp->h_lsn, cycle, block);
-        ASSIGN_ANY_LSN_DISK(recp->h_tail_lsn, tail_cycle, tail_block);
+        INT_SET(recp->h_lsn, ARCH_CONVERT, xlog_assign_lsn(cycle, block));
+        INT_SET(recp->h_tail_lsn, ARCH_CONVERT,
+                xlog_assign_lsn(tail_cycle, tail_block));
         INT_SET(recp->h_fmt, ARCH_CONVERT, XLOG_FMT);
         memcpy(&recp->h_fs_uuid, &log->l_mp->m_sb.sb_uuid, sizeof(uuid_t));
 }