[XFS] clean up xfs_start_flags

xfs_start_flags can make use of is_power_of_2 to tidy up the test a little
bit.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29327a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

2 files changed, 5 insertions, 7 deletions

diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index e973972d4633..db0d53ffe458 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -35,11 +35,11 @@ struct xfs_mount;
 #define XLOG_VERSION_1          1
 #define XLOG_VERSION_2          2               /* Large IClogs, Log sunit */
 #define XLOG_VERSION_OKBITS     (XLOG_VERSION_1 | XLOG_VERSION_2)
-#define XLOG_RECORD_BSIZE       (16*1024)       /* eventually 32k */
+#define XLOG_MIN_RECORD_BSIZE   (16*1024)       /* eventually 32k */
 #define XLOG_BIG_RECORD_BSIZE   (32*1024)       /* 32k buffers */
 #define XLOG_MAX_RECORD_BSIZE   (256*1024)
 #define XLOG_HEADER_CYCLE_SIZE  (32*1024)       /* cycle data in header */
-#define XLOG_RECORD_BSHIFT      14              /* 16384 == 1 << 14 */
+#define XLOG_MIN_RECORD_BSHIFT  14              /* 16384 == 1 << 14 */
 #define XLOG_BIG_RECORD_BSHIFT  15              /* 32k == 1 << 15 */
 #define XLOG_MAX_RECORD_BSHIFT  18              /* 256k == 1 << 18 */
 #define XLOG_BTOLSUNIT(log, b)  (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index 11f5ea29a038..47c890778bb6 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -238,11 +238,9 @@ xfs_start_flags(
         mp->m_logbufs = ap->logbufs;
         if (ap->logbufsize != -1 &&
             ap->logbufsize !=  0 &&
-            ap->logbufsize != 16 * 1024 &&
-            ap->logbufsize != 32 * 1024 &&
-            ap->logbufsize != 64 * 1024 &&
-            ap->logbufsize != 128 * 1024 &&
-            ap->logbufsize != 256 * 1024) {
+            (ap->logbufsize < XLOG_MIN_RECORD_BSIZE ||
+             ap->logbufsize > XLOG_MAX_RECORD_BSIZE ||
+             !is_power_of_2(ap->logbufsize))) {
                 cmn_err(CE_WARN,
         "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
                         ap->logbufsize);